Improvement measures from the design to the processing process One-way machinery Working conditions are arduous, work load is large and changes greatly In the construction machinery used by our company, the leakage of oil leaking from dripping oil is the first one among various faults, accounting for about 40% in particular. It is a domestically-made mechanical product. A higher leakage leakage rate is a chronic problem. It affects the reliability and lifespan of the performance of the construction machinery. The mechanical equipment at the end of the stage often suffers from such a small fault, which causes the user to suffer huge economic losses. Causes of leakage failures are many and complex. From the design and manufacturing installation process, the reasons for the leakage and prevention and control are discussed.
1 Design Aspects 1.1 Improper selection of seals Different seals are suitable for different occasions. The following factors should be taken into consideration when selecting: Ambient temperature Domestic seals are adapted to a temperature of 4 pers. 8 None, but in actual use, the temperature exceeds 80 or below 2 The elasticity of the seal is reduced, and even the elasticity is almost lost. Therefore, it is preferable to select the imported high-quality seal in a mild and low-temperature environment.
When the working speed is low speed and heavy load, it can choose to use the ring-shaped 1 ring, speed occasions should use grid to ring or ring and grid to ring combination.
Vibrating conditions Vibratory rollers operate at a relatively high level of vibration and cannot be used as a seal. A combination of relatively movable rings must be used.
Working media Different working media have different requirements for seals. The selection should be appropriate. 1.2 Fittings for improper connection of pipe fittings Welded pipe joints and end faces are added. In the form of a ring, gas lines are connected by multiple steel pipe flared structures. The clamp structure is used more. At present, the more popular card sleeve type or steel pipe flare type design and the use of card sleeve type structure, the geometric accuracy of the steel pipe and the verticality of the pipe end face shall be specified, and the tightening torque and deburring requirements shall be specified. The material is preferably selected from 15 ports. Steel Pipe.
1.3 Improper design of cover parts can also cause leakage due to the deformation of cover parts. For example, if the plane bearing pressure is too large, the flatness requirement is too low, the tightening screws are not enough or the tightening torque does not reach the specified requirements will cause leakage. At present, the use of sealant on the design can effectively prevent leakage, and it is an effective method to take measures. 1.4 Improper design of hydraulic cylinder Hydraulic cylinder is the most likely to cause leakage of the implementation of the implementation of mechanical components, the leakage of the main reasons; 1 Let 1 improperly guide sleeve be improperly designed. The old-fashioned guide sleeve material is nylon, and the seals are mostly in the form of a structure. The dust-dusting circle is a single-tongue type. Its disadvantages are short support length of the guide sleeve, small rigidity of the seal support, small thermal expansion coefficient of nylon, large gap change, poor guide effect, and the like. Leakage easily to avoid leakage, can be slightly modified in the structure, the structure will change the integral support ring to a segmented ring, and some use the Road or two grids to circle. Dust-proof ring is double-leafed, and the guide material is mostly composite material, the coefficient of thermal expansion is small, the self-lubrication is strong, the guide stiffness is large and the piston is improperly designed. The old-style piston structure adopts the domed ring in the design, and the middle adds the form of the support ring. . The disadvantage of this structure is that the support length is short, the support stiffness is small, and the support ring is open type nylon, and the coefficient of thermal expansion is large, and leakage is easily generated. In order to avoid leakage, a new piston structure can be used. The piston is provided with a support ring. Sewage ring road to the ring or road type 1 ring. This structure increases the guide length. Increased suction and contamination space to prevent dirt damage and sealing.
2 Craftsmanship 2.1 Production process Due to the poor production process, the leakage has a large proportion of leakage. Part production should pay attention to the following aspects: 1 Roughness must meet the requirements. The roughness of the sealing movement surface is very high, and it must be processed during production. . Polishing, otherwise, it can easily damage the joint surface and cause leakage.
2 扪. Groove size, shape and match requirements. Since the pressure of the seal jaw is constant, such as the size and shape of the seal groove, the preload will decrease or increase, causing leakage.
Assembly chamfering or chamfering of the groove causes leakage. In the installation position of the seal, it is easy to install or install without pulling the components. They are chamfered or rounded to prevent the high pressure oil from squeezing the seal into the gap. In the production process, it will cause damage due to various reasons, and will seriously damage the seal during work. In the production process of key components, protective measures must be taken. 2.2 Assembly Process The assembly of the hydraulic system is a very important process. Even if a well-made component is manufactured, leakage will be caused if it is improperly assembled.
When assembling seals, it is not allowed to use special tools for extrusion assembly. Special tools or tooling should be used, and parts burrs should be strictly cleaned before assembly and assembly according to strict process procedures.
3 Clean the parts before assembly. The dirt generated on the parts during processing, such as abrasive particles, can damage and damage the parts if they are not cleaned. In particular, the cleaning of hydraulic piping is more important. At present, the internal and external galvanized pipe fittings are often used. At the same time, after the assembly pool is cleaned, the hydraulic oil is filtered and the foreign matter in the pipe is removed.
5.3 baking surface painting method reference 23 5.4 selection of the weight of the weight 1 due to the maximum deformation of the beam occurs in the direction of the middle of the beam length, so = 52 = 2 = T = 0 = 2Q85t it is taken to 2, 15.5 correction and results of school bend. Put the weight of 2,1 on the center of the deflection of the beam, the first correction amount is 5, the second correction amount is 31, the third correction amount is lmm, and the fourth correction amount is 0. After 7mra4 corrections are completed, the correction amount is 9,7mm and the absolute error is 0.3mn. The 2,1 weight is still placed in the center of the beam. The correction amount is 9 and the absolute error is 1.
6 Concluding remarks After calibration, the entire machine is tested after assembly, working normally and the equipment is running well. Practice has proved that the large-size box-section beam bending deformation using thermal correction method, simple operation, quality and stability, it is suitable for the application of such components after the correction of deformation, on the first 74 pages, then page 75
Product categories of Slitting Line/Cut To Length Line,we are specialized
manufacturers from China, Slitting Line/Cut To Length Line,sheet rollforming machine,
suppliers/factory,wholesele high-quality product of Slitting Line/Cut To Length Line,
R & D and manufacturing , we have perfect after-sales service and technical support . Look forward
to your cooperation !
Slitting Line/Cut To Length Line
Slitting Line,Slitting Line Machine,Cut To Length Machine,Cut To Length Line
BOTOU HUATONG CORRUGATED MACHINERY MANUFACTURING CO.,LTD , https://www.htrollforming.com