Common causes and solutions for hydraulic cylinder rod crawling

- Aug 10, 2019-

Common causes and solutions for hydraulic cylinder rod crawling

 

Reason one: the coaxiality is not good.

 

We know that if you look for a hydraulic cylinder, if the coaxiality between the piston and the piston rod is not good, it will also cause the speed of the hydraulic cylinder to be unstable.

 

Solution: Once it is found that this problem causes the piston rod to crawl, it is necessary to adjust the coaxiality of the piston and the piston rod in time.

 

Reason two: the impact of parts processing accuracy.

 

The machining accuracy of the inner wall of the cylinder and the surface of the piston rod has a great influence on the low speed stability of the hydraulic cylinder, such as straightness. If the accuracy is not high enough, it will also cause the piston rod to crawl.

 

Solution: For the problems caused by this cause, the machining accuracy of the inner wall of the cylinder and the surface of the piston rod should be adjusted to an appropriate range.

 

Reason three: the problem of the material of the seal.

 

In the hydraulic cylinder, the hardness, strength, and followability problems of the seal material are also directly affected by the frictional force with the sliding surface, thereby causing a change in the speed of the hydraulic cylinder.

 

Solution: If the piston rod is crawling due to the problem of the material of the seal, it must be replaced to avoid such problems.

 

Reason four: Air is mixed into the hydraulic cylinder.

 

If a gas is mixed in the hydraulic oil, the piston rod will change its volume under the action of pressure. Then, even under the action of high pressure, even a gas explosion occurs instantaneously, causing the speed of the hydraulic cylinder to be unstable.

 

Solution: The problem of mixing air into the hydraulic cylinder is difficult to avoid in practice. Therefore, we can add an exhaust device to the hydraulic cylinder to remove air.

 

Reason 5: The design of the hydraulic cylinder is not properly installed.

 

The sliding fit clearance between the piston inside the hydraulic cylinder and the cylinder block, the piston rod and the guide sleeve is too large, causing uneven pressure on the sliding surface, which may cause uneven friction, causing the hydraulic cylinder to crawl at a low speed; if the sliding fit clearance is too small In addition, there are tolerances in the manufacture of parts, which may cause uneven pressure on the sliding surface, resulting in uneven friction, causing the hydraulic cylinder to crawl at a low speed.

 

Solution: For this problem, the clearance between the internal piston of the hydraulic cylinder and the cylinder block, the piston rod and the guide sleeve should be adjusted.

 

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