Correct Installation Method for Hydraulic Cylinder Leakage in Hydraulic Pipe Bending Machine

Hydraulic cylinders are commonly used for bending, straightening, extrusion, shearing, punching, and in industries such as automotive, aerospace, rail transportation, automobiles, motorcycles, bicycles, children's vehicles, steel furniture, leisure and tourism products, air conditioning, shipbuilding, sanitary ware, pipe making, and iron processing. They are used for various operations such as cutting, shrinking, expanding, bending, and riveting of pipes and profiles. Damage to hydraulic cylinders usually manifests as scoring, electrical scratches, and fatigue wear. The presence of damage affects the sealing performance of the hydraulic cylinder, usually manifesting as oil leakage. If not repaired in time, it will affect the working efficiency of the hydraulic cylinder, and in severe cases, it will lead to failure to work, or even production accidents. The following is an introduction on how to properly disassemble a hydraulic cylinder:

(1) To prevent bending or deformation of slender parts such as piston rods, wooden blocks should be used for balanced support when placing them. When disassembling a hydraulic cylinder, care should be taken to prevent damage to the piston rod tip thread, oil port thread, piston rod surface, cylinder liner inner wall, etc. (2) Hydraulic cylinders should be disassembled in sequence. Since the structures and sizes of various hydraulic cylinders differ, the disassembly sequence may vary slightly. Generally, the oil in both chambers of the cylinder should be drained before removing the cylinder head, piston, and piston rod. When disassembling the cylinder head, special tools should be used for internal key-type connections (keys or rings); flat chisels are prohibited. For flange-type end caps, use screws to push them out; hammering or prying is not allowed. If the piston and piston rod are difficult to remove, do not force them out; first determine the cause before disassembly.

(3) Before and after disassembling the hydraulic cylinder, try to prevent the cylinder parts from being contaminated by surrounding dust and impurities. For example, disassembly should be carried out in a clean environment; after disassembly, all parts should be covered with plastic sheeting, not cotton cloth or other work cloths.

(4) After disassembling the hydraulic cylinder, carefully inspect it to determine which parts can continue to be used, which parts can be repaired and reused, and which parts should be replaced.

(5) Before assembling the hydraulic cylinder, thoroughly clean all parts. (6) When installing the hydraulic cylinder onto the main unit, a sealing ring should be added between the inlet and outlet joints and tightened securely to prevent oil leakage.

(7) After the hydraulic cylinder is assembled as required, it should be subjected to several reciprocating movements under low pressure to expel gas from the cylinder.