Hydraulic Cylinder Inspection And Maintenance Tips

1 Hydraulic cylinder inspection and maintenance
In order to fully meet user requirements, in addition to design experience and processing accuracy, there is also a point to correct use and regular maintenance. The cylinder should be deflated before use, the buffer regulating valve should be adjusted to a reasonable position, the cleanliness of the oil should be checked regularly, the dust on the cylinder should be cleaned regularly, and attention should be paid to waterproof and fireproof. Inspection and maintenance of seals The piston seal is the main element to prevent leakage in the hydraulic cylinder. For the lip seal, it should focus on checking whether the lip edge is bruised and worn, and for the combination seal, it should focus on checking the wear of the sealing surface, and then determine whether the seal can be used. In addition, it is necessary to check whether the static seal between the piston and the piston rod is crushed. The piston rod seal should focus on checking the wear of the seals and supporting rings. Once the seals and guide support rings are found to be defective, seals with the same structure and appropriate material should be replaced according to the structural form of the hydraulic cylinder seals to be repaired, so as to minimize the thickness of the oil film between the seals and the sealing surface and reduce the leakage of the seals.
2 Cylinder inspection and maintenance
Hydraulic cylinder cylinder inner surface and piston seal is the main factor causing hydraulic cylinder leakage, if the cylinder cylinder produced longitudinal tensile marks, even if the replacement of the new piston seal, can not effectively eliminate the fault, the cylinder inner surface mainly check the dimensional tolerance and shape and position tolerance to meet the technical requirements, there is no longitudinal tensile marks, and measure the depth of longitudinal tensile marks, in order to take the corresponding solution. When the cylinder has trace deformation and shallow tensile marks, the cylinder is repaired by strong honing technology. The heavy honing process can repair cylinders up to 2.5 times out of tolerance than the original tolerance. It honed the parts with excessive size or shape error through a powerful honing machine, so that the overall size, shape tolerance and roughness of the cylinder can meet the technical requirements. When the inner surface of the cylinder is seriously worn and there are deep longitudinal scratches, it is mapped according to the physical object and re-produced by the professional manufacturer according to the cylinder manufacturing process for replacement. The cylinder can also be repaired with TS311 antiwear repair agent. TS311 anti-wear repair agent is mainly used for the repair of worn and slipped metal parts. During the repair process, use an alloy scraper to shave grooves with a depth of more than 1mm on the surface of the slip injury, and then clean the grooves with acetone. Apply the adjusted TS311 anti-wear repair agent to the polished surface with the cylinder inner diameter copying plate, and scrape it flat vigorously to ensure compaction and higher than the inner surface of the cylinder. After curing, polish to leave a finishing margin. Finally, the overall size, shape tolerance and roughness of the cylinder can meet the requirements by grinding. However, the life and reliability of this repair cylinder are not high.
3 Piston rod, guide sleeve inspection and maintenance
The relative motion pair between the piston rod and the guide sleeve is the main factor causing the leakage. If the chrome layer on the surface of the piston rod is spalling or producing longitudinal tensile marks due to wear, it will directly lead to the failure of the seal. Therefore, the focus should be on checking whether the piston rod surface roughness and shape and position tolerance meet the technical requirements, if the piston rod bending should be calibrated to meet the requirements or according to the physical mapping, manufactured by a professional manufacturer. If the piston rod surface coating wear, slip damage, local spalling can be adopted to remove the coating, re-chrome surface processing process.
4 Check and maintain the buffer valve
For the valve buffer hydraulic cylinder, should focus on checking the buffer valve spool and seat wear. Once it is found that the amount of wear increases and the seal fails, it should be replaced. It can also be repaired by using abrasive spool and seat matching grinding method.