How to check and repair polyurethane seals

Polyurethane sealing rings must be inspected regularly and repaired promptly if problems are found. Only in this way can the service life of the polyurethane sealing ring be extended and production costs reduced. So let’s learn about the inspection and maintenance knowledge of polyurethane sealing rings!
If all hydraulic control components are checked and there are no faults, the maintenance work temporarily enters a blind spot. The longitudinal oil cylinder of the tool holder is disassembled and inspected. It is found that the outer circle of the piston oil seal ring has been ground flat. At the same time, it is found that the outer circle size of the piston does not meet the requirements and is manufactured by machine tools. The reason is that the diameter direction is smaller than the standard size and the gap between the piston and the cylinder block is large, causing the two chambers of the longitudinal cylinder to communicate with each other and leak oil.
During maintenance, after replacing qualified pistons and shaped sealing rings, the machine tool punching fault was eliminated. The reason was analyzed that at the moment when the profiling tool holder is guided down to the position, the tool holder as a whole is subject to an impact force. After the force is decomposed There is a horizontal thrust acting on the piston rod of the longitudinal cylinder. At the same time, the solenoid valve works. The rod chamber of the longitudinal cylinder is connected to the pressure oil, and the rodless chamber is connected to the return oil path of the speed control valve. The force of the piston rod chamber is controlled by two Partially completed, one is, the other is, where is the force-bearing area of the rodless cavity, then +.
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