Hydraulic cylinder leakage brings a lot of harm, is one of the causes of hydraulic cylinder failure, but also affect the safety, pollution environment important factors, so should cause enough attention.
The leakage of hydraulic cylinder includes external leakage external leakage. External leakage refers to the external oil leakage of hydraulic cylinder cylinder cylinder head, cylinder bottom, oil mouth, exhaust valve, buffer regulating valve, cylinder head piston rod, which is easy to be observed directly the outside. Internal leakage refers to the leakage of pressure oil the high-pressure chamber inside the hydraulic cylinder to the low-pressure chamber. Internal leakage cannot be directly observed. Whether it is internal leakage external leakage, the main reasons for the leakage are poor sealing, poor contact at the joint, etc.
sealed
Poor sealing can cause external internal leakage. The causes of poor sealing are:
1. Improper assembly causes damage to seals;
2. Poor assembly accuracy, too large gap, damaged seals by extrusion;
3. The seals are rapidly worn lose their sealing effect;
4. Install the sealing ring in the opposite direction (the lip of the sealing ring faces the pressure oil), the sealing function fails;
5. Unreasonable sealing structure, pressure exceeding the rated value, loss of sealing effect.
Bad connection at joint
Poor bonding at the joint mainly causes external leakage, the reasons for poor bonding are as follows:
1. When the cylinder cylinder is bolted to the end cover, the bolt fastening is poor, the burr of the joint part the assembly burr edge cause poor binding; End face o-ring has matching clearance;
2. When the cylinder cylinder is connected with the end cover by screw, the rated torque is reached when the end cover is tightened the sealing performance of the sealing ring is good;
3. The tubing inlet of the hydraulic cylinder becomes loose due to the vibration of the pipe fitting.
Other causes of hydraulic cylinder leakage
1. Cylinder cylinder expands under pressure, causing internal leakage;
2. The hydraulic cylinder with welded structure has external leakage due to poor welding;
3. If the transverse load is too large, we should try to reduce the load.
