Single-side water pump single suction pump features

Single suction pump body mainly adopts the central support, can be more convenient to solve the pump in the delivery of high temperature medium, to prevent high temperature pump thermal expansion inconsistencies caused by the concentration of stress and change the center of the coupling . Pump bracket, pump cover, bearing parts and machine cover gland have cooling chamber, respectively, at different temperatures with cooling water or air cooling. Single suction pump's main features are: efficient energy-saving, high temperature. Single-side water pump single suction pump characteristics With the pump more competitive, the study of its characteristics is imminent. Next will be introduced through the efficient energy-saving, high temperature single-suction pump features. (1) Energy-efficient: CFD CFD is used to analyze and calculate the relationship between pressure distribution and velocity distribution in the pump, optimize the design of the pump runner, ensure that the pump has an efficient hydraulic shape line, and improve the pump efficiency. (2) High temperature resistant structure: The pump adopts center support, which solves the stress concentration caused by inconsistent thermal expansion of the pump at high temperature and the change of the center of the coupling when the pump delivers high temperature medium. Pump support, pump cover, suspension body (bearing part) and the machine cover gland have cooling chamber, respectively, at different temperatures with cooling water cooling or air cooling. General products at work there will be energy loss, single-suction pump at work also has some energy loss, of which the main factors of loss are: mechanical wear and tear, loss of volume, loss of water. Mechanical loss refers to the pump sleeve seal friction, bearing friction, impeller surface and liquid friction. Using Blu-Goo super lubricants to reduce pump seal seal friction, bearing friction, so as to achieve the pump efficiency, energy saving purposes. It is a special inert material for a variety of uses, primarily to reduce intermetal contact. Related articles: Multistage pump selection Multistage pump types and models Daquan

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Failure Analysis of Plunger Pump

Most of the domestic oilfields have entered the period of high water cut. Conventional plunger pumps are one of the major oil recovery methods. Due to factors such as high sand content, high water content and high temperature steam heavy oil exploitation, polymer injection and strong corrosive media environment and poor well conditions, the average time for piston pump repair is shorter and shorter, and some are even less than 30 Day you need to check the pump, seriously affecting the comprehensive economic benefits of oil field development. The reasons for the failure of the plunger pump in each oilfield are different, and are combined into the following factors: oil well water discharge, sand production, composition of injection, degree of salinity, bottom hole temperature, corrosion rate of effluent, well structure and Plunger pump itself structure, plunger and pump cylinder surface treatment and surface materials. The main reasons for failure are:

Sedimentation of sand grains in the pipe string: when the sand volume of the oil well is large and the water content is high, sand in the formation oil is mixed in the formation water. Since the carrying capacity of different media is proportional to the viscosity of the medium, the viscosity of the crude oil is far greater than the viscosity of the formation water. The formation water has poor sand carrying capacity at the same flow rate, and some sand particles will sink under gravity, Cause card pump and sand buried. Before the pump is completely stuck, the relative movement of the plunger and the barrel can cause scratches on the surface of the plunger and the inner surface of the barrel. Large amounts of scratches can reduce the pump efficiency.

Wear and corrosion double role: If the sand into the barrel and plunger between the plunger and pump cylinder surface wear increased, if the surface layer of the substrate exposed after wear and tear, due to the well electrolyte of the electrolyte and weak acid, the core extremely easy Corroded and worn. In addition, the general pressure difference between the two ends of the piston is 7-14MPa, in the high pressure drop, sand-containing liquid will produce hydraulic cutting plunger and pump cylinder, exacerbate wear and tear.

Plunger and pump cylinder fouling: If the injection of water untreated recycling, coupled with some oilfield water injection has been unable to meet the enhanced oil recovery and the use of polymer injection, so that downhole fluid composition becomes more The more complex and the more mineralized it is, the more likely it is to scale on the plunger and barrel. When deposits on the surface of the plunger and pump cylinder become denser and the adhesion becomes stronger, the hazard increases. In some areas, the typical plunger pump pickup cycle has been reduced from 300 days to 30 days due to fouling.

Suction pump structure: Ordinary sucker pump in the structure without any sand scraper measures, and the plunger end has a cone surface, sucker pump reciprocating process, making the sand directly to the piston and cylinder clearance settlement, And sucker rod on the sand control tank only with sand and sand scraping performance, the sand tank grit removal is not considered, after the sand tank sand control, the same will cause the piston pump cylinder wear.

Surface Treatment and Material Selection of Pistons and Cylinders: Investigations have shown that the selection of the pump plunger and barrel surface preparation processes and materials can significantly change the service life of the pump. The plunger and pump barrel are a pair of friction pairs. Studies have shown that the friction coefficient between the plunger and barrel surface material and the sand particles can also affect whether the sand particles will get stuck in the gap between the plunger and the pump barrel.

Versailles Versailles Ball wear and tear corrosion: sucker rod through the swimming valve and the piston connected to the reciprocating motion of the piston valve cover makes the valve carrying a load of varying sizes of asymmetric stress in the valve opening and closing process, continuous The impact caused the valve wall wear and fatigue damage. As the outlet of well fluid, the gas mask is affected by the erosion and erosion of the liquid flow due to the change of the direction of the liquid flow, eventually resulting in failure of the fracture. Versaille seat due to long-term fluid and solid erosion, can also lead to sealing surface failure.

Piston and pump cylinder clearance: plunger and pump cylinder with the reciprocating movement of the clearance fit. The relative movement of the pump barrel and the plunger relies on the sealing effect of the small clearance between the mating surfaces, and at the same time, this slight clearance ensures that there is always a certain amount of liquid loss between the plunger and the pump barrel for lubrication and cooling. For certain well conditions, the pump gap is an important technical parameter of the pump, the size of the pump gap directly affects the efficiency of the pump, affecting the pump cycle.

Downhole tube string partial wear and corrosion: due to various factors lead to tubing, sucker rod, centralizer, sucker rod coupling and other wear and corrosion, if wear and corrosion products such as iron slag, tubing coating flaking deposition in the pump On, resulting in card pump and Versail not leak after sealing.

Pumping depth: deepening of the well pump will make the pump to withstand the load increases, making the plunger and pump cylinder pressure and friction increases, the fluid on the plunger and pump cylinder hydraulic erosion will Increase, coupled with the above other factors, pump failure will speed up.

Well body structure: As the pump cylinder length of about 4-9 meters, if the hanging pump section shaft is not vertical, such as horizontal wells, inclined shafts or dogleg at the cylinder may be deformed or partial contact with the plunger and the barrel Will increase the plunger and pump barrel between the local wear and corrosion.

Downhole temperature and pressure: Downhole temperature has an indirect effect, such as affecting the plunger and pump cylinder corrosion rate, affecting the speed of scaling, and even affect the deformation of the cylinder easy.

Can be seen from the above, plunger pump failure due to many reasons, should be based on the specific well to identify the main reasons and take appropriate measures.

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Piston oil pump surface treatment protection technology introduction

Most of the domestic oilfields have entered the period of high water cut. Conventional plunger pumps are one of the major oil recovery methods. Due to factors such as high sand content, high water content, high salinity, high temperature steam heavy oil recovery, polymer injection and strong corrosive media environment, the average pump inspection period of piston pump wells is shorter and shorter, and some are not even To 30 days to check the pump, seriously affecting the development of oil fields. According to the plunger pump failure reasons, such as oil well water, sand, corrosion and scaling implant injection, high salinity, bottom hole temperature, the liquid medium corrosion, well structure and the plunger pump itself Structure does not meet the plunger and pump cylinder surface treatment and surface materials can not meet the demand, etc., plunger pump protection methods are varied, mainly in the following categories:

Pump structure changes

In the sand production wells, conventional plunger pump often appear sand card plunger, sand buried sucker rod, sanding cylinder and plunger and other phenomena, the pump failed prematurely. In response to these problems, pump developers designed a long plunger short pump sand control pump. In the production process, there is always a part of the plunger exposed to the pump cylinder, grit into the pump barrel and the plunger is not easy to enter the gap between the stop card to stop after the sand stuck sand or sand buried plug the accident effectively extended the well Free repair period. Some pumps also add some auxiliary components, such as scraping up and down the cup, the function of joints, the purpose is to further prevent sand deposition between the pump barrel.

Self-rotating plunger pump allows the plunger at each stroke of a random rotation, and constantly changing the contact surface of the plunger and the pump cylinder, the plunger circumference gradually wear uniform at the same time the sand or scaling from the plunger and the pump cylinder Between the discharge, to solve the abrasive material aggregation caused by serious positioning wear and pole trip.

In order to achieve the sand control effect, a gap free sealed oil pump and a piston oil pump have also been developed.

Improve the shape of the groove on the plunger and groove position can play a certain amount of sand sand control effect.

According to statistics, the plunger pump failure on the valve cover more prominent, the failure of the main form of fracture. Occurred in two parts: First, the valve cover at the oil hole; First, the connection rod and the upper thread roots. To this end, specially designed and developed on the anti-off on the valve cover to prevent the pump working on the valve cover fracture.

Some pumps are also designed to have multiple swimming Versailles and fixed Versailles in order to prevent leaks between Vernier balls and Versailles.

"Vacuum" chamber type double plunger pump is used to extract the viscous and viscous oil and water emulsion, it is the use of "vacuum" chamber when the pumping unit under the stroke caused by sucker rod and plunger Of the downward force, so that they produce downward forced movement. Diaphragm pump is used to extract the abrasive particles (such as sand and mechanical impurities) and corrosive media containing crude oil, which is the use of diaphragm pump will be the working elements to be protected against sand, salt and corrosive Fluid formation of the media contact, to extend the service life of the pump.

Pump material and surface treatment improvements

General lining materials for the 20CrMo carburizing or 38CrMoA nitriding, there are 45 steel electrochromic chrome, carbon steel plunger chrome plating treatment. Such cooperation does not meet the high sand, high salinity media environment, from the failure of the investigation and analysis of the point of view, with the deputy protective layer is easily damaged by abrasion of high hardness quartz sand, followed by serious electrochemical Corrosion, resulting in protective layer off, can cause serious pump accident. Judging from the current actual situation of the oilfield, the plunger using Ni-based spray coating alloy has been relatively common, can partially solve the above problems, but the effect is still not very good for serious sand or serious scaling. With the surface treatment technology and material processing technology improvements, will continue to introduce new plunger and pump cylinder material and surface treatment process, then pay particular attention to the plunger and the barrel of the material to optimize the match. Anton Valve Engineering Co., Ltd. is about to launch the special ceramic pump, will greatly enhance the plunger pump anti-sand, anti-scaling, anti-wear, high temperature performance in several areas.

Valve and valve seat material most of 3Cr13, a few for the 6Cr18Mo and 9Cr18Mo. From the field of application of view, its hardness, wear resistance and corrosion resistance is poor caused by fixed valve damage, the main reason for failure. There are oilfield carbide car seat replace the original 6Cr18M, but note that the valve ball will increase the density of the pump resistance and pressure drop at the fixed valve. There are also ceramic Versailles and ceramic seat, ceramic Versaille may sometimes crack, also pay attention to use.

Pump related string structure change

Through the use of ultra-high strength rod string, and the bottom of the column with a certain weight weighted rod, you can prevent the bending of the pump cylinder to reduce the plunger and pump cylinder wear and tear.

Manufacturing process

Due to the differences in the processing, material handling and assembly of the pump barrel plungers, various parameters of the pump of the same specification can not be completely identical, thus causing a variety of unexpected accidents. Quality control during the processing is to be strengthened.

Other measures

Such as the use of low-stroke long-stroke low-stroke parameter matching; select a sufficient liquid supply wells and to maintain the same pump efficiency, the submergence of the pump should be slightly larger than the design of small pumps can also extend the pump to some extent .

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Sister think, is it right? Few people will deliberately measure their own chest, usually based on the advice of shopping guide choose size? I was like before, are shopping guide with the eyes look, say what I wear code, what code I buy. However, there are still gaps found ~ so find some measurement methods, you can control according to their own situation to see Oh ~

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Bottom

A suitable base is basically horizontal, it will be flat with your body, will not be carnivorous, and just right to allow two fingers in the shroud slide.

[Bottom around too loose] running around the bottom, located above the scapula, you need to change the smaller end of the base;

[Bottom circumference too tight] the end of the door into the meat, causing Le pain or discomfort, need to change some of the end of the circumference.

Cups

The right cup should completely wrap your breasts (including furs), smooth fit the chest curve, not wrinkled. Lift the arm will not run up, the position of the bra fit your body, will not float, the overall feeling stable.

【Cup too small】 Cup oppression breast, resulting in breast deformation, or cup mouth, armpit meat squeeze out, or chicken heart floating, indicating cup is too small, north face you need to cup a cup of bra.

【Cup too large】 cup surface fold, or empty cup, indicating cup is too large, you need to cup a small cup of bra.

Chicken heart bit

The right chicken heart position should be close to the body, do not float, the overall feeling stable.

[Chicken heart floating] Heart floating at the heart, not close to the body, indicating the cup is too small, the breast can not be fully accommodated into the cup, you need to change some cups.

Strap

The right shoulder strap should be lean, fittingly conform to the body curve, elastic strap moderate, through a finger.

[Shoulder strap too tight or too loose] Leggings into the meat shoulder strap, straps too tight, should be loosened some. Shoulder strap slipped, indicating Guo Song shoulder strap, should be tightened some.

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Piston oil pump wear characteristics, identification and repair

First, the wear characteristics of the plunger coupling, identification and repair 1, the wear characteristics of the plunger, even the wear of the plunger coupling, the main focus on the plunger head, the beam at the stop for the edge and the plunger into Back to the hole at.

(1) wear characteristics of the plunger head Here wear the largest in the contact surface with a shallow upper and lower, coarse rough under the small groove marks wear milky white, especially in the light of the obvious. The maximum depth of groove marks up to 0.023-0.025 mm, the maximum width of 4-5 mm, a length of about 10 mm.

(2 plunger head wear characteristics of the beam here than the piston head wear small, mostly comb-shaped deep furrows, the same on the deep under the light, rough under the fine.

(3) wear characteristics of the plunger stop edge from the upper edge of the chute upward wear gradually reduced, the wear width of about 5 mm, was milky white, while stopping the edge of the edge is blunt blunt round.

(4) wear characteristics of the lower plunger shoulder wear here is very small, only short lines on the shoulder circumference.

(5) wear characteristics of the plunger sleeve wear mainly in the back near the oil hole, and into the oil hole at the back than the oil hole. The wear area of ​​the oil inlet hole is located near the centerline of the hole, and the upper wear extends about 6-7 mm upward from the upper edge of the hole, about 0.024-0.027 mm deep, and the lower portion extends downward about 4.5 mm deep from the lower edge of the hole, About 0.015-0.017 mm, the wear width is larger than the hole diameter.

The wear on the surface near the oil return hole is mainly on the left, 2-2.5 mm wide, 2-3 mm upward, 4-5 mm downward, with minimal wear on the right side of the hole.

2, the identification of the plunger coupling For the identification of the plunger coupling, the first is to use visual inspection to see if there are obvious defects, qualified or can not be determined, and then further identified by the test.

(1) visual identification with the naked eye to see the head of the plunger, stop around the edge of the hole around the plunger sleeve, due to wear and milky white, scratch with a clear sense of nails, plunger or set rust, cracks, columns Plug the top or stop for the edge of a flake, etc., one of the above defects, the plunger is scrapped.

(2) with a simple vacuum identification with the right index finger to cover the top of the plunger hole, the left hand slowly pull the plunger outward, then the right index finger should feel suction, when pulled about the plunger length of 2/5 When the plunger is released, the plunger quickly returns to its original position under the action of vacuum suction. This means the plunger can be used continuously. Otherwise, should be new or pending repair.

(3) sealing test identification injector test can be used to test the plunger into the fuel injection pump body, into the oil valve seat and other parts, not installed out of the valve and valve spring, tighten the oil Valve seat, the fuel pump outlet valve seat tight end connected to the injector tester high-pressure hose connector, the plunger at the maximum supply position, pressure injector tester hand lever, the hydraulic pressure Rising to 22,540 kPa, pump oil was stopped and the time required to reduce the oil pressure from 19,600 kPa to 9,800 kPa was determined. Its value should be 16-29 seconds. Otherwise, it is unqualified.

3, the piston coupling repair

(1) uneven upper end of the plunger sleeve can be used above the abrasive particle size 600 coated thick glass, grinding the upper end. Grind the plunger sleeve and the glass plate should be kept perpendicular, with light and uniform, while rotating, while moving, and continue to change the direction of rotation, grinding smooth end without scoring.

(2) Block in the plunger sleeve Blocking is generally common in the newly replaced plunger pair, the guide portion of the plunger can be coated with oil and plunger sleeve for mutual research. If the tightness is too large, it should be coated with polishing research. Grinding can be used to drill or hand drill to hold the plunger, hold the plunger sleeve with the right hand to move back and forth. For the top of the plunger touching the pin, you can use a fine size of 800 stone, coated with oil, the plunger tilted about 30 degrees, gently turning the plug to remove burrs.

(3) For severe wear of the plunger coupling, should be replaced with new parts.

Second, the valve wear characteristics of oil, identification and repair

1, the wear characteristics of the oil valve coupling parts The wear of the valve coupling parts, mainly in the sealing cone, vacuum ring and guide part.

(1) wear characteristics of the sealing cone wear larger here, the seat ring seal ring width increases, the finish decreased; in the valve cone there is a ring groove, the depth of about 0.05 mm.

(2) wear characteristics of decompression zone wear here is also larger, the decompression ring after wear tapered, up and down small; all over the surface of the cylindrical groove marks, the shallow depth; The lower edge is rounded due to wear.

(3) wear characteristics of the guide surface where wear less wear after the upper part of the lower part of the larger, in the oil valve seat and the valve seat decompression ring with the guide part also wear.

2, the identification of the valve valve

(1) General appraisal With the naked eye observation, if the valve has one of the following defects, it can not be used.

① Decompression ring with serious signs of wear, was milky white scratches, scratches with a clear sense of nails or decompression ring with the axial notch on the circumference of the intensive to see the original surface finish.

② seal conical surface wear too much, seal ring is too wide or in the seal ring with a collapse.

③ out of the valve and valve seat rust, or metal peeling and deep abrasive scotch.

④ out of the valve seat under the plane when a serious rust.

⑤ oil valve seat sealing conical surface has obvious groove marks, scratch with a nail feeling.

(2) out of the oil valve seal simple test identification

① seal cone simple test identification with the thumb and middle finger holding the oil valve seat, the oil valve with the index finger on the valve seat, with the mouth out of the hole under the oil valve seat, and moved to the lips, if Can be sucked lips, indicating good sealing performance. You can also put the valve assembly into the pump body, without a plunger, from the high-pressure tubing joints through the 294-490 kPa compressed air inspection. If not leak, indicating good sealing performance, or repair or replacement of new parts.

② decompression ring with a simple seal performance test identified with a thumb against the hole under the valve seat, the valve will be placed in the valve seat, gently press down with the index finger, when the pressure zone into the seat ring When, feel the upward rebound of compressed air. When you release the index finger, the valve can bounce up, then said. Ming vacuum ring and the valve seat hole of a good seal, otherwise it is unqualified.

For newly replaced oil valve parts, but also for sliding test. Will be soaked in diesel oil out of the valve coupling parts removed, hold the valve seat to keep it in the vertical position, and then the valve out of about 1/3 of the valve body, that let go, the valve body should be able to The weight of the role of the valve seat, and then turn the valve any angle test, the results should be the same.

3, the valve repair parts out of the oil valve determines whether the key part of the work is to seal the cone. Sealing cones a slight wear or poor contact, the sealing cone can be evenly coated with abrasive paste, and then insert the seat rotary grinding, grinding several times, and then converted one direction of grinding. Be careful not to stick the abrasive paste to the pressure relief ring. After grinding for a certain period of time, wash off the abrasive paste, and then dipped in diesel interoperability, and the valve in the valve tap a few times. Grind, clean, and then seal performance test.

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Effective Control of Temperature Crack in Pumping Concrete Construction

Abstract: This paper mainly expounds the problems existing in the temperature cracks in the construction of pumping concrete and analyzes the causes, and puts forward effective measures to control and prevent temperature cracks and improve the quality of concrete pouring.

Key words: Pumping concrete Temperature crack Cause analysis Control measures

1 Introduction

With the continuous development of building technology, pumping concrete construction technology has been popularized and applied. Pumping concrete can not only improve the construction performance of concrete, the thin-walled tendon structure less vibration or vibration pound construction, with improved impermeability, improve durability characteristics. At the same time, pumping concrete aggregate grading restrictions, the massive use of cementitious materials, resulting in a large number of hydration heat, resulting in the prevalence of temperature cracks, to some extent affect the impermeability and durability of the structure should be sufficient Pay attention. To this end, now on the mechanism of temperature cracks and how to effectively control the emergence and development of cracks, talk about a few superficial understanding.

2. Mechanism and characteristics of temperature cracks

Concrete pouring, in the hardening process, cement hydration produce a lot of heat of hydration. Due to the large volume of concrete, a large amount of hydration heat accumulates inside the concrete and is not easy to be dissipated, resulting in a sharp increase in internal temperature, while the concrete surface radiates fast, causing a large temperature difference inside and outside the concrete structure. These temperature differences cause internal and external heat The degree of expansion and contraction of different, so that the concrete surface to produce a certain tensile stress. When the tensile stress exceeds the ultimate tensile strength of concrete, the concrete surface cracks will occur, such cracks occurred in the late construction of concrete. During the construction of concrete, when the temperature difference changes a lot or the concrete is attacked by the cold wave, the concrete surface temperature will drop drastically, while the concrete with shrinkage and surface shrinkage will be restrained by the internal concrete, which will produce a great tensile stress Cracks are generated, which usually occur only in shallow areas of the concrete surface.

The trend of temperature cracks usually have no regularity, large-scale structural cracks are often criss-crossed; the length and size of the beams are large, the cracks are parallel to the short sides; the deep and penetrating temperature cracks are generally parallel or nearly parallel to the short sides Cracks appear along the long edge of the section, the middle of the more dense. The width of the crack varies in size, which is more obvious due to temperature changes. It is wider in winter and narrower in summer. Concrete temperature cracks caused by high temperature expansion are usually thin at the middle and coarse ends, while the thickness variation of the cold shrinkage cracks is not obvious. The emergence of such cracks will cause corrosion of steel, carbonation of concrete, concrete to reduce freeze-thaw resistance, anti-fatigue and impermeability.

3. Influencing factors and prevention and control measures

The internal temperature of concrete and concrete thickness and cement varieties, dosage related. The thicker the concrete, the greater the amount of cement, the higher hydration of cement, the higher the internal temperature, the formation of temperature stress, the greater the likelihood of cracks.

For mass concrete, the temperature stress formed by it is related to its structure size. Within a certain size range, the larger the concrete structure size is, the larger the temperature stress is. Therefore, the risk of cracking is also greater, which means mass concrete is easy to produce The main reason for temperature cracks. Therefore, the most fundamental measure to prevent cracks in the mass concrete is to control the temperature difference between the inside and the surface of the concrete.

3.1 Selection of concrete raw materials and mix

(1) try to use low heat or medium heat cement, reduce the amount of cement.

The main reason for cracks caused by large volume of reinforced concrete is the large accumulation of hydration heat of cement, which causes early and late cooling of concrete, resulting in the temperature difference between the interior and the surface. To reduce the temperature difference is the choice of medium heat Portland Portland cement or low heat Portland Portland cement, pump or fly ash in the mix, you can also use slag Portland cement. Again, you can make full use of concrete late strength, in order to reduce the amount of cement. Improve aggregate gradation, mix fly ash or superplasticizer to reduce the amount of cement and reduce heat of hydration.

(2) Add admixture

A large number of experimental studies and engineering practice show that concrete mixed with a certain amount of high-quality fly ash, not only can replace part of the cement, but also because of the ball-shaped fly ash particles with a ball effect, play a lubricating effect, can improve the concrete mixture The fluidity, cohesion and water retention, thereby improving the pumpability.

A particularly important effect is that after mixing as-is or ground fly ash, the cement hydration heat can be reduced and the temperature increase under adiabatic conditions can be reduced. Addition of a certain amount of concrete admixture with water reducing, plasticizing, retarding and other additives to improve the fluidity of concrete admixture, water retention, reduce heat of hydration, postponed the emergence of hot peak time.

3.2 construction process improvement

(1) improve the mixing process

Adopting the double-feeding net-wrapped wadding or mortar wabing process can effectively prevent water from accumulating on the interface between the cement mortar and the gravel, making the structure of the transitional layer of the hardened interface dense and increasing the adhesive strength, thereby increasing the strength of the concrete 10 % Or save 5% cement, and further reduce hydration heat and cracks. Improve the concrete mixing process, in the traditional three-cooling technology based on secondary air-cooled new technology to reduce the pouring temperature of concrete.

(2) strictly control the pouring process

Reasonable arrangements for the construction process, layered, sub-block placement, in order to facilitate heat dissipation and reduce constraints. On the pouring of concrete, before the final setting of the second vibration, can rule out concrete due to bleeding, in the stones, the lower part of the horizontal reinforcement of the formation of the gap and moisture to improve the bond strength and tensile strength and reduce internal cracks and pores, Improve crack resistance. Pumping in the hot season, should be covered with warm grass bag pipe cooling to reduce the mold temperature.

(3) focus on pouring conservation

Maintain the concrete is to maintain proper temperature and humidity conditions. Insulation can reduce the thermal dispersion of concrete surface, reducing the temperature difference of the concrete surface to prevent surface cracks. Concrete pouring, timely use of wet straw, linen and other coverage, and pay attention to watering conservation, proper maintenance time to extend, to ensure the concrete surface cooling slowly. In the cold season, the concrete surface should be set insulation measures to prevent cold wave attacks.

4 temperature crack treatment

Concrete cracks repair measures are mainly taken the following methods: such as surface repair method, caulking method, structural reinforcement method, concrete replacement method.

4.1 surface repair method

Surface repair method is mainly applied to stabilize and structural carrying capacity has no effect on the surface cracks and deep cracks processing. The usual treatment measures are to apply grout, epoxy cement or surface anticorrosive materials such as paint and asphalt on the surface of the crack. In order to prevent the concrete from cracking due to various functions, it is usually used in the cracks The surface of glass fiber cloth and other measures.

4.2 caulking method

Caulking method is one of the most commonly used method of sealing cracks. It is usually along the crack gouging, plastic or rigid waterproof material embedded in the groove, in order to achieve the purpose of sealing cracks. Commonly used plastic materials are PVC clay, plastic ointment, butyl rubber, etc .; commonly used rigid waterproof material is polymer cement mortar.

4.3 structure reinforcement method

When cracks affect the performance of concrete structures, it is necessary to consider the use of reinforcement method of concrete structures for processing. Commonly used in structural reinforcement mainly in the following ways: to increase the cross-sectional area of ​​the concrete structure, the angle of the components of the outsourcing of steel, prestressed reinforcement method, paste steel reinforcement, an additional fulcrum reinforcement and reinforced concrete spray reinforcement.

4.4 concrete replacement method

Concrete replacement is an effective way to deal with serious damage to concrete by removing the damaged concrete first and then replacing it with new concrete or other materials. Commonly used replacement materials are: ordinary concrete or cement mortar, polymer or modified polymer concrete or mortar.

5 Conclusion

The existence of temperature cracks is an unavoidable common phenomenon in concrete construction. The same is true for pumping concrete construction. However, we should understand that the appearance of cracks will not only reduce the impermeability of buildings, affect the function of buildings, but also cause the corrosion of steel bars, the carbonization of concrete, the durability of materials and the bearing capacity of buildings. Therefore, during the construction, we should fully recognize the danger of the cracks to the building, adopt various effective measures and reasonable treatment methods to prevent the emergence and development of the cracks, and continuously improve the quality of the concrete pouring to meet the safety of the building structure Stability and other requirements.

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Concrete pump in the construction of the right choice

1, concrete pump selection

1.1 classification

From the mobility can be divided into automotive concrete pump (pump), frame pump (without active boom), trailing concrete pump. From the power form can be divided into electric and internal combustion engine. From the pump form, currently widely used ramp valve and the "S" pipe valve type; the former has the advantage of the concrete aggregate diameter requirements of the wider (40 mm), the price is lower, the disadvantage is The gate valve needs to be lubricated continuously with a pumping height of about 100 m. The latter has no lubrication system and requires strict aggregate (not more than 33 mm). The pumping height can be up to 150 m and the selling price is generally higher.

1.2 Selection

According to working experience, concrete equipment for large-scale thermal power plant construction is generally equipped with 2 mixing towers (stations), 3 concrete pumps, one pump towed pump or two pump towed pumps, and multiple selection of inclined gate valve In order to meet the aggregate requirements, this mobility, economy, practicality are more reasonable.

1.3 Selection Precautions

(1) primary election concrete pump, be sure to visit the user, learn more about the actual use.

(2) must choose the regular manufacturer mass production of concrete pump.

(3) try not to use any manufacturer's first (first batch) concrete pump.

(4) Should be signed with the manufacturer sales direct contract to buy, as far as possible through the middle part, in order to facilitate maintenance services.

2, new pump debugging

2.1 in the factory before the pump debugging content

(1) Personnel: Technician, operator and driver each one, operator is skilled worker.

(2) read the instructions carefully.

(3) Check whether the concrete pump is consistent with the model number in the contract and whether the certificate number and nameplate number are the same.

(4) the appearance is satisfactory, whether there is leakage, leakage at.

(5) According to instructions, determine the maximum and minimum displacement of the movement of the piston movement. Such as Hubei Construction Machinery Factory HBT60 pump displacement of 8 ± 1 times / min, the maximum displacement of 28 ± 1 times / min.

(6) Check the mixing system, cooling system, lubrication system is normal, the automotive jib pump must also check the boom system, leg system, the car part is normal.

(7) empty load operation 2 h, review the system for any leaks, seepage, during which the pressure gauge should be normal.

(8) Check all the random spare parts are complete, intact.

All qualified before receiving.

2.2 on the site for the first time before using the debugging content

(1) repeated manufacturers to pump debugging content.

(2) Concrete pump installation site should be flat and solid, especially the leg support. Concrete pump as close to the construction site, and consider the exit route after the end of the operation.

(3) layout and reinforcement of the transmission pipeline (external pipe).

(4) empty load operation 10 ~ 20 min, so that the lubrication points are obviously grease.

(5) in the displacement of pumping mortar 1 ~ 2 m3, when the mortar fast pump can be poured into the concrete, directly into the normal pumping.

Test the pump, carefully observe the various parts of the work without exception. Such as oil pump, oil temperature, the main pressure gauge changes, the frame pump should also pay attention to boom movements and engine work, if any unusual circumstances, should be immediately shut down, find out the reasons for re-examination after troubleshooting. Do not wash the pump after pumping, carefully check the ministries have no leakage, leakage phenomenon, after passing the pump or directly into use.

3, pumping skills

The difficulty of concrete pumping (ie pumping effect) generally depends on the quality of concrete itself, the pouring point distance, the size of the pipe, the situation and the prevention of pipe plugging tube, pipe plug suddenly ruled out in time. (Concrete quality of concrete pumping effect on the greater impact, but not introduced here)

3.1 duct selection

According to Table 1, the maximum particle size of concrete coarse aggregate table select the appropriate duct.

3.2 external pipe layout

Should be to minimize the use of elbows, pipe serious wear and tear should be located far away from the concrete pump location, so as not to over-pressure squib.

Various forms of pipe converted into horizontal length (approximate).

3.3 concrete pump tube exclusion

(1) anti-pump exclusion Once plugged, you can press the "anti-pump" switch, the general anti-pump run 4 to 5 trips can be ruled out.

(2) When the anti-pump operation can not be ruled out pipe plugging, as soon as possible to open the plug at the duct, and remove the blockage. Note that in addition to cutting off the power before demolition, but also to completely eliminate the remaining pressure in the tube.

3.4 season construction

Summer hot climate construction, should be covered with wet shrouded cloth, straw bag duct, so as to avoid the tube of concrete "dehydration", delivery difficulties. Winter cold season construction, should be wrapped with insulating material pipe, to prevent the concrete inside the pipe by the cold.

3.5 Pumping work completed precautions

(1) Thoroughly clean the concrete pump and external pipe.

(2) check the random tools.

(3) 20min running air to make the lubrication points covered with grease.

(4) safe exit from the job site.

4, routine maintenance

Due to the variety of concrete pumps, here only introduce some common maintenance.

4.1 Pre-departure inspection items

(1) Booms, slide valves and outriggers should be fully retracted and locked.

(2) work lights, signal device is working properly.

(3) Adequate fuel, grease and wash water.

(4) sufficient hydraulic oil, all parts do not leak oil.

(5) All kinds of plumbing, tools, appliances and accessories should be complete.

4.2 The main components inspection cycle

(1) daily inspection of the appearance of damage to the deformation, loose parts exposed, operation and performance changes, leakage of oil, hose damage, lack of lubricating grease lubrication points, car driving safety factors.

(2) monthly (or pump concrete 2 000 m3) Check the spool valve damage, duct wear, hydraulic oil reduction, lubrication points forced lubrication, the car routine maintenance.

(3) Six months (or 12,000 m3 of concrete pump) Check the lower shell of the slide valve, damage to the conveying cylinder, deterioration of electrical components and hydraulic oil, damage to the boom, and routine overhaul of the vehicle.

(4) Check the stirring device, stirring oil motor, rotary oil motor, water pump and oil pump every year (or 24,000 m3 of concrete pump) to change hydraulic oil.

(5) Every two years (or 48,000 m3 of concrete pump) Check all items CAUTION Disassemble all seals for replacement, and the automobile part should be overhauled at the designated or professional repair point.

4.3 hydraulic oil and lubricating oil, fat selection

Hydraulic Oil Model: Winter 32 anti-wear hydraulic oil, non-winter 46 anti-wear hydraulic oil.

Sliding valve lubrication: Non-extreme pressure type 000 lithium-based grease winter, non-winter non-extreme pressure type 00 lithium-based grease.

Car and the rest of the lubrication: Calcium grease No. 2 or with reference to instructions.

5, wearing parts repair

5.1 repair range

In the chuck slide valve concrete pump, concrete contact with many parts, wear are very powerful, and we can repair only individual parts, the rest, such as rubber parts, concrete conveying cylinder, valve stem and other pieces of fine processing, Generally take replacement. Repairable wear parts are divided into two categories: one is the surfacing repair parts, such as the spool valve plate, spool valve cover (also known as the lower slide valve housing), the valve slide valve seat, the mixing valve; One is welding repair, mainly for concrete pipes.

5.2 Detection of wear and tear

Sliding valve disc generally lower part of the serious wear and tear, when the size of new parts and wear size difference greater than 5 mm, which need to be repaired; When the need for repair; mixing blades on both sides of the corner of the serious wear and tear, when the size of the new pieces of wear and tear when the size difference of more than 8 mm, that is, to be repaired; under the bottom of the spool valve cover and both serious wear and tear when the new size and wear After the size difference is greater than 5 mm, which need to be repaired.

5.3 repair process

(1) to determine the material slide valve cover chemical composition test results, C: 3.13%, Si: 2.06%, Mn: 0.83%, P: 0.102%, S: 0.126%; hardness of HB203 ~ 228; MT-4 wear-resistant cast iron.

(2) electrode selection of the bottom of the surfacing should be good anti-hot cracking performance of austenitic nickel-based electrode Austrian 102, Austrian 302. In order to further improve the wear resistance of the welding site, under the premise of ensuring that the base metal is not cracked, a hard alloy electrode stack 667 is also used, and a heap 507 is used for surfacing on the surface of the surfacing layer.

(3) Pre-surfacing method Before use, Austrian 102 and Austrian 302 electrodes are dried at 105 ℃ ~ 200 ℃ for 1 h with a stack of 667. The heap of 507 electrodes is dried at 300 ℃ ~ 450 ℃ for 2 h to reduce the hydrogen Content, prevent stomata. Both electrodes are used AC welding machine, the former current 100 ~ 110 A, the latter current 130 ~ 140 A.

Will be surfacing parts of the surface of grease, concrete and other impurities removed, with a soft shaft grinding wheel to wear out the lack of fatigue layer, so that the surface exposed metallic luster. Use asbestos or cotton wrap the cylinder tube and the surrounding components to prevent burns when surfacing. Preheat the bottom cover to 150 ℃ ~ 250 ℃ to prevent cracks. When welding electrode movement direction using straight line method. Welding sequence using the sub-back-welding method, from the inside out, but the direction of movement of the electrode from the outside. The welding length of each section is not more than 50 mm, try to avoid the influence of welding heat. Each welding a sub-paragraph, with sharp steel tapping carefully to eliminate residual stress and prevent cracks. After welding, immediately wrapped with asbestos, so slow cooling. After cooling, with a grinder grinding surfacing part of the surface. After grinding, check by coloring method and confirm that there is no crack of 30 mm or more. Note that heap 667 or heap 507 can only be surfacing the surface layer.

In addition to the delivery pipe, other wear parts can be repaired by the bottom of the valve spool, the steps can be simplified.

(4) Duct repair points in four cases are as follows:

① the first tube to wring deflated flat jig can also be used instead of vices, and then prepare a diameter and duct diameter close to (slightly less than) of the steel pipe end into a projectile handle, so just to give deflated Office heating, steel pipe can be used to correct the circle.

② local wear generally only repair the elbow, because under normal circumstances, when a straight pipe wear a certain part of the rest of the part is also close to the wear limit, no repair value, while the elbow generally wear the first bend. The repair method is to cut a piece of medium size scrap on the waste pipe and grind the damaged parts and pieces with a grinder to select the welding rod suitable for the pipe. During the repair should pay attention to the curvature.

The pipe hoop can be cut off in the waste pipe with a pipe hoop part of the length of the pipe carried by the ferrule should be 45 ~ 55 mm, polished with a grinder welded parts, select the appropriate welding electrode can be.

④ with wear limit hole straight (bend) tube If the hole in the slurry, the general is no longer used to repair, if you want to repair the use of small pressure available external pipe tail. In fact, the general repair of the pipe are best used in the external pipe tail, prohibit the use of the boom.

6, how to extend the life of the slide valve

There are inclined concrete pump 7 sets, often encountered in the process of premature failure of the spool valve, mainly as follows: the injury site is mostly spool valve stem, the stem has different depths and irregular axial Groove, stem movement resistance, the upper and lower can not reach the required position, the valve stem can not be severely affected by movement. At this point must be downtime maintenance, and even to replace the valve stem or valve assembly, both economic and direct impact on concrete pumping work. After the collapse of the general performance of the valve spool: nylon seal severely damaged, broken sand, small concrete blocks, or even pebbles; grease supply pipe top plugging phenomenon.

After analysis, may cause the slide valve damage factors are: ① lubrication system failure; ② improper operation (before work or after the end of work empty load is not enough); ③ poor quality of the grease; ④ poor quality concrete; ⑤ spool itself quality Poor; ⑥ slide valve trauma. One of the most likely to cause the slide valve damage, mainly due to lubrication system failure and improper operation.

Sliding valve lubrication system is mainly composed of grease box, filter, grease pump, damper, grease distribution valve and grease pipeline. One of the key components is the grease distribution valve.

Sliding valve lubrication system failure is that its lubrication point can not be required lubrication or lubrication is not good, but to determine the specific point of lubrication is not good, but also must observe the distribution valve on the grease distribution valve indicator valve and safety valve display rod work , If necessary, need to release the lubrication point interface observation. Lubrication distribution valve by the distribution valve and safety valve, as shown in Figure 2. Its purpose is to distribute the grease from the grease pump to the specified position. When the top of one of the supply tubes is clogged with mortar, the safety valve display sticks out, indicating an abnormal supply of fat. Dispense valve is also equipped with a distribution valve display rod, under normal circumstances fat cycle 1, the display rod action 1 times, if the display rod does not move, that is, the function of the dispensing valve is abnormal. There is a non-swappable feature between the lubrication line and each lubrication point.

If you want to fully use the concrete pump in practical work, you should also accumulate more practical experience, continuously improve the proficiency of the operator, try to shorten the troubleshooting time of the concrete pump to pump failure so that the concrete pump can play its due role in the construction Role.

EO Residual Gas Treatment System

The equipment is used to treat the residual gas after EO Gas Sterilization process. It contains spray cabinet, the purifying stuffing absorbing tower, spray circulation pipeline, water collecting tank, storage tank, steam water separator, chillers etc. to achieve the effective absorption of eo gas, to achieve the discharge standards.

Advantage:

Automatic control system :

automatic circularly purifying, automatic adding liquid, automatic acid adding, liquid

conveying and automatic delay function.

Real time monitoring:

Initial concentration of exhaust gas, purification gas emission concentration,

level, pH value and so on. Once purified gas emissions exceeded,

instantly and automatically acousto-optic alarm.

FAQ:

1. Are you a manufacturer?

Yes, we are the professional manufacturer set up in 1992, located at a beautiful town of Zhejiang Province.

2. Can you provide the oversea service?

Yes, after the machines arrive at your factory, we will arrange engineers go to install the machine and train your operators.

3. Can we visit your factory?

Of course. We highly welcome clients come to visit our factory. It will be our great honor to meet you.

4. How can you guarantee the quality?

100% qualified products before the delivery. The clients can inspect the products at our factory.

1 year warranty ( failure caused by machine quality ) from the equipment arrive at the

EO Residual Gas Treatment System

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Spiced pumpkin biscuit processing technology

After initial processing of pumpkin, adding some supplementary materials, it can be made into a delicious and resistant instant food.

Process flow: material selection - primary processing - salt cooking - auxiliary material blending - forming - drying - finished product packaging.

Specific processing steps:

Choice of materials. Choose ripe pumpkins (generally require nine maturity), no pests and diseases, and a small amount of pumpkin as raw material.

First Processing. Wash the squash, peel, remove and remove the seeds. Then cut the melon meat into pieces.

Salt cook. Cut the pieces of melon meat into a pot, add clean water, and add salt at the ratio of melon meat:salt=10:0.2 and boil it in the pot.

Accessories distribution. Wash sesame, garlic, red pepper, ginger, and dry it. Then add mushrooms and stir into a paste. The increase or decrease of the above-mentioned accessories can be determined according to the needs of the taste.

forming. The above-mentioned auxiliary materials are added to the boiled squash, fully stirred, and placed in a shaping tank, which can be made into a round shape, a square shape and a biscuit shape.

drying. The shaped pumpkin biscuits were placed in an oven and dried at 65 degrees Celsius to obtain finished products.

package. Packaged in the form of commercially available cakes, should be sealed honey.

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Single-side water pump single suction pump parameters

[Asia Fluid Network News] more than a shaft seal, mouth ring more easily leaked. Single-suction pump has the advantages of less sealing than double-suction pump and relatively low cost. The efficiency of the impeller is generally higher because cavitation does not need to be considered. If the inlet pressure is high, the single-suction impeller axial force balance Big problem It has the characteristics of: dust and splash water, energy saving, long life and other seal. As its use grows, there are many more ways to look at such products. Single suction pump parameters now more and more attention, single suction pump parameters include: flow, lift, efficiency, speed and so on. Single-side water pump Single suction pump Parameters Model: ISG15-80: The following will introduce the parameters of the five types of models: Flow: 1.1l / s; Head: 8.5m; Efficiency: 26%; Speed: 2900r / min; Motor power: 0.18kw; NPSH: 2.3m; Weight: 17kg; Model: ISG20-110: Flow rate: 1.8 / s; Head: 16m; Efficiency: 25%; Speed: 2900r / min; Motor power: 0.37kw ; NPSH: 2.3m; Weight: 25kg; Model: ISG20-160: Flow rate: 1.8 / s; Head: 33m; Efficiency: 19%; Speed: 2900r / min; Motor power: 0.75kw; NPSH : 2.3m; Weight: 29kg; Model: ISG25-125: Flow rate: 2.8 / s; Head: 20.6m; Efficiency: 28%; Speed: 2900r / min; Motor power: 0.75kw; Weight: 28kg; Model: ISG25-160: Flow: 2.8 / s; Head: 33m; Efficiency: 24%; Speed: 2900r / min; Motor power: 1.5kw; NPSH: 2.3m; Weight: 39kg; The above analysis we can conclude that: a single suction pump in a slight difference in different types of parameters, such a difference to provide customers with more choices, customers You can select a product by its own needs, even if two similar products, but manufacturers can provide the best product experience. With the variety of single suction pump, customers can have more choices, but a product you want to have long-term and stable development, must have some competitiveness, manufacturers are still faced with the difficulties is very arduous. Related Articles: High pressure pump selection of high pressure pump types and models Daquan

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The benefits of raw radish

Scientific research has found that radish contains an anti-tumor and anti-viral active substance that stimulates cells to produce interferon. It is called interferon-inducing agent and it treats human esophageal cancer, gastric cancer, nasopharyngeal cancer, and cervical cancer. There is a significant inhibitory effect.

After the radish is cooked, its effective ingredients have been destroyed, and raw radish is eaten--those can be chewed to release the active ingredients in the cells, and be careful not to eat or drink after half an hour in order to prevent its active ingredients from being diluted by other foods. 100 grams to 150 grams daily or every other day.

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Advantages and disadvantages of single-inlet water pump single suction pump

When the single-suction pump starts to work, the impeller rotates at a high speed driven by the pump shaft. The main purpose of the single-suction pump is to realize the high-speed rotation of the pre-filled liquid between the blades. Under the action of inertial centrifugal force, Impeller center for radial movement to the outer periphery. Liquid flows through the impeller in the process of gaining energy, static pressure can increase the flow rate increases. When the liquid leaves the impeller and enters the pump casing, it will decelerate due to the gradual enlargement of the flow passage in the shell. Some of the kinetic energy will be converted into static pressure energy and flow into the discharge pipe in the tangential direction finally. Therefore, the snail-shaped pump housing is not only a collection of components from the impeller out of the liquid, but also a transformable device. The following will introduce the advantages and disadvantages of single suction pump. Single-side water pump Single suction pump Single suction pump Advantages: 1, low management costs, small footprint; 2, high efficiency and energy saving, high temperature; 3, low noise; 4, easy maintenance; ; Single suction pump Disadvantages: 1, single suction pump processing is easy to cause casting defects, cavitation, erosion, corrosion and chemical etching; 2, mechanical wear and tear caused by increased loss and resistance, so that the volumetric efficiency and mechanical efficiency; , Single suction pump in the work process is prone to energy loss; through the analysis of the advantages and disadvantages of single suction pump, we can conclude that single suction pump is a small equipment, the use of high efficiency, long service life of the centrifugal pump, However, it is very regrettable that there are still some shortcomings. These shortcomings have to be confronted with the increasing use of these pumps. Only when such problems are solved can single suction pumps be compared in centrifugal pumps Optimistic future, for which manufacturers need to do more research and development. This not only requires more manpower and resources, but also the support of departments and agencies. Related Articles: High-pressure pump advantages and disadvantages Vertical pump advantages and disadvantages

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Unilateral water pump single suction pump types and models Daquan

Under normal circumstances, the same type of product different models, their parameters are generally the same, but there will be differences in the specific data. Single suction pump in a slight gap between the different types of parameters, such a difference to provide customers more choices, customers can choose their own needs products, a product you want to have long-term and stable development, we must have a certain competitiveness, There is still a lot of work to be done on further research on its type and model. Next, mainly through the model comparison, to explain the single suction pump model features. Single-side water pump Single suction pump Type and model Daquan Model: ISG15-80: Flow: 1.1l / s; Head: 8.5m; Efficiency: 26%; Speed: 2900r / min; Motor power: 0.18kw; Cavitation Balance: 2.3m; Weight: 17kg; Model: ISG20-110: Flow rate: 1.8 / s; Head: 16m; Efficiency: 25%; Speed: 2900r / min; Motor power: 0.37kw; NPSH: 2.3m ; Weight: 25kg; Model: ISG20-160: Flow: 1.8 / s; Head: 33m; Efficiency: 19%; Speed: 2900r / min; Motor power: 0.75kw; NPSH: 2.3m; Model: ISG25-125: Flow rate: 2.8 / s; Head: 20.6m; Efficiency: 28%; Speed: 2900r / min; Motor power: 0.75kw; NPSH: 2.3m; Weight: 28kg; 160: Flow rate: 2.8 / s; Head: 33m; Efficiency: 24%; Speed: 2900r / min; Motor power: 1.5kw; NPSH: 2.3m; Weight: 39kg; Through the above analysis, we can generally understand To, single suction pump models are mainly five, they mainly by model, flow, lift, efficiency, speed, motor power, N , Weight and other parameters to show their characteristics. Through the data research we can see that there are some differences between the different types of single suction pumps, but precisely because of these differences, for customers to improve the product experience better. Related articles: Vertical pump types and models Daquan Horizontal pump types and models Daquan

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Double-inlet pump double suction pump working principle and structure

As more and more people pay attention to the centrifugal pump, we can find that the inlet and the outlet of the double suction pump are both below the axis of the pump, and the horizontal direction is perpendicular to the axis. The pump casing is open , No need to dismantle the inlet water, exhaust pipe and motor from the coupling to the direction of the pump, the pump is counterclockwise rotation. The next main analysis of double suction pump working principle. Double-side inlet pump double suction pump working principle and structure Impeller after static balance verification, with the sleeve and the sleeve nut on both sides of its axial position can be adjusted by the sleeve nut, the impeller axial force Balanced with the symmetrical arrangement of its blades, some of the remaining axial forces may be supported on the coaxial end bearings. The pump shaft is supported by two single row radial ball bearings mounted on the bearing body at both ends of the pump body and lubricated with grease. Double suction seal ring to reduce the pump water pressure water chamber leakage back to the suction chamber. The main structure of the double suction pump: pump body, pump cover, impeller, shaft, double suction sealing ring, sleeve, bearings and so on. In addition to the shaft material for high-quality carbon steel, the rest mostly made of cast iron. The pump body and the pump cover form the working chamber of the impeller. The inlet and outlet water flanges are provided with tube screw holes for installing the vacuum gauge and the pressure gauge, and the tube screw holes for discharging water are provided under the water flanges. The pump is driven directly by the motor through the coupling. Shaft seal for the soft packing, in order to cool the lubrication seal chamber and prevent air leakage pump, there is a water seal between the packing, pump a small amount of high-pressure water flow through the filling pipe from the filling chamber sealing effect. Through the study of its working principle, we can find that the working principle of the double suction pump is on the other hand shows the working principle of the centrifugal pump in more detail. As the use scope of the double suction pump gradually increases, more and more people pay attention to the research The working principle of the product development and improvement has a very important role. A product is not only its own value, more likely to represent the direction of the development of the entire product, just as the barrel principle, only by all aspects of development, the rapid development of the entire industry. The same is true for double suction pumps. Related Articles: Single-side water pump single suction pump working principle and structure diagram Volute pump working principle and structure

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YB series of ceramic hydraulic piston pump selection and use

High-pressure mud transfer and frame filter are the key processes in non-metal production. The mud flows under high pressure and the abrasion is very good. Ordinary pumps can not be used under such working conditions. In order to solve the problem of this process, YB series ceramic hydraulic piston pump produced by Xi'an Whirlpool Machinery Manufacturing Co., Ltd. has the advantages of high outlet pressure, good wear resistance and convenient maintenance. It is the only one that has passed TUV international certification ceramic column Plug pump manufacturers. YB series ceramic hydraulic piston pump was first used in ceramic production to the spray drying tower transmission of mud, and now the production of ceramic spray drying tower does not have a YB series ceramic hydraulic piston pump. At present, the pump is widely used in ceramics, porcelain, non-metallic, chemical and other fields. In order to make everyone better use and use YB series ceramic hydraulic piston pump, now the basic selection methods are described below:

First, the type and classification of piston pump:

The pump is divided into high-pressure pump, low-pressure high-flow pump and variable pump, the same specifications are also divided into ordinary pump and anti-corrosion acid pump. High-pressure pump for long-distance or high-altitude slurry delivery; low-pressure high-flow pump for a stable mass of slurry delivery; variable pump is suitable for use with a variety of filter press filter supporting the use of such pumps with the filter density Increased automatically to make the pressure increase? Flow reduction.

Second, the plunger pump selection:

YB series piston pump is mainly used for the transmission of ceramic slurry, coal water slurry, kaolin and non-metallic mineral suspension. It can also be used for the transportation of mine slurry, chemical slurry of food suspension and magnetic material. The transportation solid content is more than 70 %, Variable pump equipped with a filter press with high work and energy efficiency. Selection should pay attention to the following points: 1, to determine the medium conditions, the plunger pump medium is not allowed to appear in large particulate matter, otherwise it will cause work failure, iron pollution requirements of the occasion should use stainless steel plunger pump, acid Or alkaline medium anti-corrosion piston pump should be used; 2, to determine a reasonable flow range, the nominal displacement of the plunger pump model is the flow rate, the selection should be considered appropriate margin range; 3, determine the applicable pressure level, plunger Pump rated pressure can reach 2.0-2.5MPa, with the filter should be used when the variable displacement pump, the slurry should be used low-pressure pump, reducing waste; 4, to determine the above parameters, according to the principle of rather big, according to the standard Model selection YB series ceramic plunger pump; 5, if in doubt, should call the professional manufacturer, professional engineering and technical people to help selection.

Third, YB series ceramic plunger pump use

1, the installation: the pump on the basis of the level of correction, with the ground screw can be fixed? No need to ground screw ?, To facilitate the replacement of hydraulic oil and flushing mud pipeline, the pump should be 10 centimeters above the ground, based Drainage should be around.

2, the use of pumps:

(A), the preparatory work before the start: Check the fastening of the parts; check the fuel tank level, the level of the oil tank to the oil scribing shall prevail in summer with N46, N32 winter with hydraulic oil. High-pressure pump and pump applications above 140 the same type of anti-wear hydraulic oil. Check the pressure gauge range, pressure gauge hydraulic station 0-16MPa, pressure gauge on the air tank should be 0-6MPa range, can not be installed anti.

(B), start: open cooling water; closing, open the switch, jog start button, check the motor steering, should be clockwise, must not be reversed. After checking the correct, then start the motor and pump.

(C), the operation of regulation: (1), adjust the relief valve can adjust the hydraulic pressure, you can adjust the mud pressure, adjust the pressure relief valve should be back on the lock nut, each open stop without moving relief valve, oil Pressure can not be higher than 12MPa. Note: The pump should be low-load start, if the two pumps alternately, you can stop after the start, without adjusting the relief valve; (2), adjust the position of the two bumper on the carriage, plunger stroke can be adjusted; (3), when the plunger and seal ring wear leakage occurs, the appropriate pressure ring, tightly grout is appropriate, when the pressure ring to the packing box is still contact with the leakage slurry can be sealed ring at the end plus Gasket. In order to ensure that the seal ring and the plunger concentric, the upper end of the pressure ring and the packing box strive to the upper end parallel to the unevenness of not more than 0.5mm; (4) variable pump and filter press with the use of regulation: adjustment method with the operation of regulation 1).

When the pump is delivered from the factory, the pressure of sending slurry is set to 2.0MPa. If the pressure of the slurry to be sent is lower than 2.0MPa, adjust the overflow counterclockwise to make the pressure reach the required value when the plunger runs slowly.

(D), downtime:

(1), press the stop button, the pump stops.

(2), stop cooling water.

(3), flush with the valve box.

3, pump maintenance and wearing parts replacement:

(A), in order to ensure the normal operation of the pump, should pay attention to the following: a, the choice of clean high-quality hydraulic oil, the general filter once in January, three months to replace once metamorphism replaced; b, the pump can not pass cooling water Start and work in case of ceramic plunger to prevent the rapid burst of heat and the rubber seal ring heat damage, the water also played the role of flushing the plunger to extend the life of the plunger and seal ring; c, seal Ring should not be pressed too tight to not slippery as appropriate; d, long-term cold in the cold season when the pump should be drained pumping mud, to prevent cracking of the pump; e, hydraulic system and mud pipeline seals F, should make the plunger stroke as long as possible to the piston does not impact the cylinder cover, agile commutation is appropriate; g, when seen from the pressure gauge on the air tank pressure fluctuation is greater than 0.2MPa , You must stop the pump, open the following valve, drain the mud, make up the air, if necessary, remove the pressure gauge on the air tank, flush the valve box from the upper port; h, regularly (about a week) check and flush the valve box; i , Bladder type After half a year can be filled with nitrogen or an argon gas, preferably pneumatic pressure 3.0MPa.

(B), wearing parts replacement:

(1), the seal ring: remove the pressure ring screw, manipulate the relief valve, the system gradually increase the oil pressure to promote the piston, the use of mud pressure seal ring loosening, the plunger lifted after the pump, remove the piston rod Remove the seal ring with the coupling screw of the plunger, carefully insert the plunger into the pump body, surround the plunger with an extremely thin piece of copper, and attach the seal ring one by one.

(2), the plunger: the method above, until the plunger referred to a higher position to stop the pump, remove the piston rod and plunger coupling screw. Then pull the plunger and packing together to replace the new plunger, one by one to tighten the screws.

(3), the pump: Remove the cap screws, lifting the fuel tank cap? With the motor ?, This action must beware of crash anti-oil filter and tubing, remove the suction pump, drain, and then remove the fixed pump Screw, you can remove the pump.

Precautions:

1, Flushing the valve box and replace each of the parts, do not be too tight tight rod top, no leakage can be;

2, remove the right cylinder replacement piston on the pin, pay attention to the pin must escape the gap under the cover of the cylinder (oil communication port), otherwise, can not fill the oil and the piston can not be commutated;

3, part of the fuel tank should always be kept clean, can not be washed with water lid and manifold;

4, hydraulic oil to be absolutely clean, we must regularly check the quality of oil;

5, after adjusting the pump pressure, generally do not go to adjust the relief valve, otherwise the original system disorder, prone to failure;

6, there is an abnormal sound, should immediately shut down, check the source of the fault, repair it.

Essential Oil

Essential Oil,Rosemary Oil ,Lavender Essential Oil ,Pure Essential Oils

Fuel Dispenser Co., Ltd. , http://www.nbhumidifier.com

Double-inlet pump double suction pump features

[Asia Fluid Network News] With double suction pump in industrial production has been widely used. Double suction pump is composed of two back to back impeller combination, the flow of water from the impeller into a volute. Double suction pump has the following characteristics: it is equivalent to two single-suction impeller of the same diameter at the same time work at the same impeller diameter flow can be doubled; pump shell level in the open, easy inspection and maintenance, while double Pump inlet and outlet in the same direction and perpendicular to the pump shaft, which will help pump and out of the water pipe layout and installation; double suction pump impeller structure is symmetrical, there is no axial force, the operation is relatively stable. Double suction pump is there are two suction chamber, pump suction inlet and inlet are vertically below the axis. The main impeller or water direction. Double suction pump benefits is the same speed and flow, due to reduce the inlet flow rate, the pump is not prone to cavitation. Double-suction pump double suction pump features 1, double suction pump better balance the axial thrust; followed by a few analysis of double suction pump features: 2, double suction pump is not prone to cavitation; 3, double Suction pump mouth ring more easily leak; 4, double suction pump running smoothly; 5, double suction pump NPSH lower, but efficiency is lower; 6, from the structure, the double suction pump mostly do Into BB1, BB2 type; 7, double suction pump in balancing the axial force has a great advantage; after the above points of research and analysis can be drawn that the double suction pump is characterized by good balance, high head, flow, operation Smooth, not prone to cavitation, but its main drawback is the low efficiency. With the rapid development of China's economy, centrifugal pumps are also challenged with greater challenges. For the double-suction pump in centrifugal pumps, it is more and more difficult. At present, its scope of application is still limited. In order to break this boundary, all circles There is still a lot of work to do. Related Articles: Single-side water pump Single suction pump Features Vertical pump features

ABS Case History Trolley

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Prefabricated Building Co., Ltd. , http://www.nbhospitalsupplies.com

Application of ICP DAS I-7000 Module in Deep Well Pump Group Control

Abstract: Aiming at the low self-control level of deep well pump group control system in brewery's water supply, it is difficult to meet the requirement of brewery's water supply. The control system of deep well pump group with high reliability and low cost has been developed.

Water supply is the lifeblood of beer production, beer demand for water production and large changes over time, taking into account the lower costs and reliable water supply, Yanjing Brewery's water supply is not by the water company, but by distribution within a few kilometers radius 100 meters of 25 deep well pump group to supply, in the past, because there is no automatic control system, in order to adapt to large changes in beer production on water consumption, 24 hours a day on duty to go on-site to open or close the pump, 365 a year Therefore, the factory decided to use the automatic control system, the early use of a factory inspection device, due to the quality of the system equipment However, due to the unreasonable design of the communication lines and the continuous failure of the system, the brewery made technical tests with the I-7000 series. The experimental results show that the I-7000 series can fully exert its monitoring effectiveness.

A? System Description:

The I-7000 series is a function module applied in the field, which can realize the collection and control of the on-site signal. The I-7000 series is based on the RS-485 bus. The master computer is obtained from the module through the RS-485 bus Data or issue commands to the module, so the RS-485 bus is very important for the I-7000 module, and the existing line situation is very unsatisfactory, the scene distribution distance, irregular wiring, therefore, the existing line segment processing , I-7510 relay module is added for every more than 1200 meters, I-7510 is added to the irregular line segment, and each transmission waveform is observed through an oscilloscope. The transmission characteristic is changed by adding terminal resistance to achieve the best transmission effect.

System block diagram is as follows:

The host computer is RS232 / 485 converted via I-7520 and connected to each well by wire. Each well has a 35- to 55-kilowatt three-phase motor driven by a three-phase motor that pumps deep well pumps and controls three-phase motors Open and stop, using 4-channel relay output module I-7060D, the use of voltage / current sensor output 4 ~ 20 mA signal sent to I-7017 to collect three-phase voltage and three-phase current, reflecting the normal operation of three-phase motor or not.

Second, system functions and software:

According to the requirements of beer production, the operation of 25 deep-well water pumping pumps is required to be set as manual and automatic working modes. In manual working mode, the operator can open or close any well arbitrarily. Under the automatic working mode, Collected water level to decide how many wells to open or close, and according to the water level changes within the unit time to control the pump speed on or off. Pumps pumping water to the total water to the pool and then flow to the factory pool , The pressure on the water pipe is limited, and the pump starts to exert tremendous pressure on the water pipe. Therefore, the time for opening the water pump is strictly controlled and can not be opened at the same time. It must be turned on one by one and maintain a certain delay. In order to When the pump is turned on, the three-phase working voltage and current of the motor should be monitored. When there is imbalance and defects, the motor should be turned off and an alarm should be generated to facilitate timely maintenance to avoid causing the motor damage.

Figure 1:

Figure II:

The system uses the FIX map control software, FIX is the United States Intellution company launched real-time monitoring and configuration of industrial software platform. The powerful features of FIX and Visual C, the system software mainly to achieve the following functions:

1, The overall picture: Overview Map Real-time automatic tour or manual display of all well data, two pool water level, is the main interface for field operations, as shown in Figure II.

2, automatic / manual switch: The system provides two modes of operation: the first for the whole manual mode, that is, the system only from the surveillance role, the switch pump by the operator to complete; second automatic mode, that is, the program set the water level After the system automatically track the water level, without human intervention. Automatic / manual switch to complete the main manual and automatic switching.

3, the report print: The use of Visual Basic database to achieve real-time data and historical data sharing, timed automatically print the daily report, and ready to print real-time reports.

4, Alarm: The system can define alarm events in advance, such as water level overrun, three-phase voltage / three-phase current overrun. When an alarm event occurs, the system will display this alarm, meanwhile, this alarm event forms a notepad file; Event is automatically deleted after confirmation. After the actual operation of the test, the system has fully achieved its intended purpose. Which ensures the reliable water supply requirements of beer production, improves the automation level, reduces the labor intensity of duty personnel and achieves good social benefits and economic benefits.

Standard Machine

Standard Machine,Water Filling Machine ,Filling Equipment ,Bottling Equipment

Filling Machine Co., Ltd. , http://www.nbsealingmachine.com

Laozi play table, from the end of the pressure box to the erotic table

The past two years, with the improvement of mechanical and metal processing technology, CNC engraving machine is widely used, the watch is also based on the traditional pattern of children's renovation, although there are still many new bottles of old wine stuff, but after all, is new Bottle children, craft and processing accuracy is far from the old craft comparable. Asked the table, since Ming, birds, even the couple, calendar, a soul hooker than the one, the life of the person, wallet child is also more deflated than the new toy.

Gossip, to be back, we still talk about neither old nor change bottle children. Mentioned spring palace secret, pious gentleman must scoff, open mouth will shout "save nature, destroy desires ", do not think the old master Cheng Zhu Neo-Confucianism is also a teapot with rice bowls Fan children, three wives and four concubines , All night not idle, GuoDeGang speech: This is human nature, do not fight with humanity. From the beginning, this thing is accompanied by human beings. Without it, multiplication and religion will be problematic. In antiquarians, there is something called "human ancestor" in the high pottery pottery, though interested people Very few, but it is true after humans into the patriarchal society idol worship of ancestors, specifically I do not elaborate, we can do for GOOGLE Baidu. By the late stage of human civilization, everything from the east to the west has never been cut off. The various things called "dowry painting," "pressure box bottom," "palace map," and "mystery plot." Our east and west loft artisans in order to meet the general public's kitsch taste, but also continue to introduce new, all kinds of concealed, explicit, flattering Spring Palace mystery pictures, crafts after another. In China, people who buy similar products like this, from the dowry paintings that give the bridegroom a bridegroom to prepare (there is no formal education at that time, children who do not know husband and wife after getting married, parents, As soon as possible to enjoy the enjoyment of children's enjoyment of music, so later generations of a lot of antiques are children will be "pressure box at the end of children"), to enjoy Qi Qi blessing Kai-sheng pharmacy Simon officials, to collect such toys for the music , Is a good thing.

Western artisans since the clock made this small mechanical and electrical equipment, in addition to the needs of navigation and computing, playing from the sesame chain influx of time, did not forget to use the Spring Festival drama and fairy ass fairy fight Decorate it, and then sell it to people of all walks of life in different needs, let them hide in their sleeves, hold in their arms and keep an eye out for the sake of secret play. A variety of painting enamel models, outside the clothing, the pocket watch shell exposed decoration, walking doll music devices, ranging from one to three, not afraid to ask Tourbillon this technical device products, after all ---- --- This is humanity!
I recently customized a Svend Andersen old palace couplet, using the famous writer Hu Ye Fo "Golden Lotus" Palace, the relatively more subtle works, tentatively there are eleven groups of moving joints, although not the East Korea and other places Erotic Miu Miu on the exaggerated description of the true meaning of the organ, but it is "Liu Ba Baigo know" Chinese palace, that is, you often talked about in the "Mensao" word.

Andersen, the independent tabloader of the older generation in the 70s and the founder of the Swiss Independent Watchmaking Association, was still active in his "Bottle Clock" and World Time watch since coming out of Old Berlin and Patek Philippe He was himself an "old bottle" in the 1970s and 1980s. His work is called "old wine." As we all know, old wine may deteriorate, but it is more likely to be mellow, What I hope for is an old-school "kitsch kitsch" toy made by him before he returns to his pasture. Mr. Lao's works are often on a variety of auctions, in fact, the auction results are not good, but he made the toys more old-fashioned watchmakers pure customized to meet customer needs and down-to-earth feeling, every time the composition and design meticulous Communicating with clients is even more different from the high ceilings of many high profile independent watchmakers. Craftsmen, selling the arts, not real celebrities highbrow, you "real celebrities," you do not have to watch it make money? (Laughs) His custom work is very much of this flavor. Some criticize his watch for not being very meticulous, using simple enamel paint for painting, and selling it for a while, and I strongly agree that his work is indeed endless Ideal place, perfect is impossible, after all, the old school small workshop out of the handmade doll can never be better than the big brand meticulous gold engraving and enamel description, but the taste is not imitated by others, occasional flaws also shows The table itself is handmade.

When we talk about human nature and kitsch, we talked about it 15 years ago when I tweaked all kinds of stuff in Panjiayuan Antiques City and Mr. Zhang. Suddenly one day more than 60 of Mr. Zhang came along and told me A joke children, his shop next to the string of a number of his goods: twelve late Qing Dynasty plus purple spring palace snuff bottles, shot the same day, the buyer actually is a nun from South Korea! This little joke shows at least one thing. Spring and the secret can be done as well as "art." Of course, the "art" I mean here is artistry rather than art. Kitsch is far from being interpreted as erotic and erotic so simple, as long as it is in order to meet the personal needs of customers, you are worth mentioning, the next person worth mentioning, can be interpreted as pro-customer vulgar, dare to ask if I have enough money, PP custom made to me A tourbillon attached to the dial rather than the back of the table, then not necessarily called kitsch or profitable opportunism, there may be passed as a beauty, you can deny this possibility? You dare to say it is not vulgar?
The above stream of consciousness, think of the front door may be said that the machine gun leader, you are welcome to slap brick scolded street, I play a small downtown, and you guys scold the street shameless nor too shame, pants pulled out also lavish.

Cat Scratching Board

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Office Chair Co., Ltd. , http://www.nbcatscratchboard.com