This article mainly introduces:

Vietnam hydraulic cylinder,pressure retaining cylinder manufacturer,pressure retaining cylinder

(Vietnam pressure retaining cylinder,produced by Hengyu Hydraulic Cylinder Factory）

pressure retaining cylinder are widely used in Vietnam，because of no need for deceleration device，long service life，smooth movement.So our company has designed pressure retaining cylinder for customers from Vietnam.

Introduction to pressure retaining cylinder:

When installing the pressure retaining cylinder, the axial ends of the pressure retaining cylinder cannot be fixed. Due to the effect of liquid pressure and thermal expansion in the pressure retaining cylinder, there is axial expansion. If the two ends of the pressure retaining cylinder are fixed, all parts of the pressure retaining cylinder will be deformed. When disassembling the pressure retaining cylinder, it is strictly forbidden to hammer the pressure retaining cylinder and the piston surface, such as the pressure retaining cylinder hole and the piston surface is damaged, do not allow sandpaper grinding, to use a fine oil stone carefully grinding. The clearance between the guide sleeve and the piston rod should meet the requirements.

Causes and countermeasures of oil pressure retaining cylinder leakage: Cast iron ring seal allows a certain degree of internal leakage. The impurities in the pressure retaining cylinder will lead to premature wear of the piston seal, replace the piston seal; If the pressure retaining cylinder is visibly scarred, the pressure retaining cylinder must be replaced. It can be pressurized at one end of the pressure retaining cylinder and opened at the other end of the oil port to observe whether there is obvious internal leakage at the end of the oil port. Most pressure retaining cylinder piston drift may not come from the pressure retaining cylinder, the above method to determine the pressure retaining cylinder without internal leakage is helpful to determine the problem of the hydraulic system related components.

If the pressure retaining cylinder is sliding or crawling (stop and go), check whether there is any astringency inside the pressure retaining cylinder. The internal parts of the pressure retaining cylinder are improperly assembled, the parts are deformed, worn or the shape and position tolerance is excessive, and the action resistance is too large, so that the piston speed of the pressure retaining cylinder changes with the different stroke position, and there is slip or crawl. Most of the reasons are due to poor assembly quality of parts, surface scars or sintered iron filings, so that the resistance increases, the speed decreases. For example, the piston is different from the piston rod or the piston rod is bent, the pressure retaining cylinder or the piston rod is offset from the mounting position of the guide rail, and the sealing ring is too tight or too loose. The solution is to repair or adjust, replace damaged parts and remove iron filings. At the same time, check whether the lubrication is good or whether the pressure retaining cylinder bore processing is out of whack. Because the piston and pressure retaining cylinder, guide rail and piston rod are relative If the pressure retaining cylinder is crawling seriously, check whether air has entered the hydraulic system. Air compression or expansion can cause the piston to slip or crawl. The exclusion measures are to check the hydraulic pump, set up a special exhaust device, and quickly operate the exhaust several times in the full stroke. Check the seals at the same time, because the quality of the seals is directly related to slippage or crawling. When the O-ring is used under low pressure, compared with the U-ring, it is easy to slip or crawl because of the higher surface pressure and the larger difference between static and static friction resistance. The surface pressure of the U-shaped sealing ring increases with the increase of pressure, although the sealing effect is correspondingly improved, but the difference between static and static friction resistance is also larger, the internal pressure increases, affecting the rubber elasticity, due to the increase in the contact resistance of the lip, the sealing ring will tip over and the lip elongation, and it is also easy to cause slip or crawling pressure retaining cylinder weight composition and calculation. The weight of the pressure retaining cylinder is composed of the pressure retaining cylinder diameter, the outer diameter and weight of the pressure retaining cylinder, the rod diameter, and the weight of the accessories, so in calculation, it is to add all these together to get the specific value. However, if there are special circumstances, it may be calculated separately. This work can be carried out by yourself, but it can also be carried out by professionals, so that mistakes can be avoided.

The piston rod of the pressure retaining cylinder has two kinds of solid rod and hollow rod, and one end of the hollow piston rod needs to be set aside for welding and heat treatment. The solid piston rod material is 35, 45 steel, and the hollow piston rod material is 35, 45 seamless steel pipe. After rough machining, the piston rod is conditioned to 229~285HB in India, and if necessary, the hardness is 45~55HRC after high-frequency quenching.

Answers to some questions about pressure retaining cylinder:

How is the hydraulic cylinder selected in the mechanical design manual?
First of all, it is necessary to meet your work needs, and the second is to meet the structural space of the cylinder and accessories. Three to consider the other parameters of the cylinder.

What is hydraulic cylinder guide?
The cylinder itself can not move, the piston moves, the guide should be used to guide the mechanism connected with the piston extension end. For example, in the commonly used hydraulic press, the guide column above is used to guide the pressure plate connected with the piston.