Reasons and solutions for poor hydraulic cylinder seal performance
Release time:
2015-01-22
Source:
Everyone knows that after using a hydraulic cylinder for a period of time, the two most common undesirable phenomena are a decrease in operating speed and insufficient thrust. The main reasons for these two situations are as follows: 1. Excessive leakage of hydraulic oil inside the hydraulic cylinder. 2. The oil seal at the end of the hydraulic cylinder is pressed too tightly, but it is also possible that the piston rod has bent, resulting in a significant increase in resistance and friction. 3. The operator frequently uses only a certain section of the stroke when using the cylinder, leading to poor linearity of the cylinder, and in severe cases, causing damage to the hydraulic cylinder.
It is common knowledge that after a period of use, hydraulic cylinders often exhibit two main problems: reduced operating speed and insufficient thrust. The main reasons for these issues are as follows:
1. Excessive internal hydraulic oil leakage in the hydraulic cylinder.
2. The cylinder end seals are over-tightened, or the piston rod may be bent, increasing resistance and friction.
3. Operators frequently only use a certain section of the stroke, leading to poor linearity of the cylinder and, in severe cases, causing communication between the high and low pressure oil at both ends of the hydraulic cylinder.
4. The clearance between the piston and cylinder may be too large, or the O-ring seals may be severely damaged, causing communication between the high and low pressure chambers.
5. The hydraulic oil temperature in the cylinder is too high, reducing viscosity. Cylinders with poor sealing quality and clearance sealing will exhibit slower operation. If there is communication between the high and low pressure chambers at both ends of the cylinder, the operating speed will be even slower, potentially leading to complete stoppage.
Regarding the above-mentioned phenomena, here are some solutions: First, locate the leak in the cylinder and tighten all joints. Second, remove the oil seal; if there is no leakage, it's fine. Then, correct the piston rod. Next, bore and repair the hydraulic cylinder cavity diameter and reconfigure the piston. Finally, adjust the hydraulic cylinder clearance, replace the piston, or replace the O-rings. Furthermore, analyze the causes of cylinder heating and find ways to dissipate heat and cool it down.
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