Compensating and monitoring device for wear of hydraulic cylinder piston rod seal

Abstract

The invention is a compensating and monitoring device for wear of a hydraulic cylinder piston rod seal. A Y-shaped sealing ring with a cavity is adopted to serve as a piston rod seal, and contact status change of a hydraulic cylinder piston rod sealing pair surface is monitored through a fiber grating sensor in real time to provide information feedback for wear compensation of the seal; and corresponding compensation is conducted according to an actual wear condition of the hydraulic cylinder piston rod seal, so that leakage of liquid of a hydraulic cylinder is furthest reduced to prolong the service life of the piston rod seal while the sealing performance and the operating efficiency of the hydraulic cylinder are ensured. According to the compensating and monitoring device, the magnitude of contact stress of the Y-shaped sealing ring with the cavity and the piston rod can be changed in real time to enhance the sealing performance; the magnitude of contact stress of the hydraulic cylinder piston rod seal can be monitored dynamically, so that the magnitude of contact stress of the seal is adjusted and controlled dynamically according to the wear condition of the piston rod seal; and a proportional decompression valve with high frequency response is adopted to provide output pressure for the Y-shaped sealing ring with the cavity, the response is rapid, the stability is good, and the control accuracy is high.

Description

technical field [0001] The invention relates to a monitoring device, in particular to a hydraulic cylinder piston rod seal wear compensation monitoring device. Background technique [0002] The hydraulic cylinder piston rod seal plays an important role in ensuring the normal operation of the hydraulic cylinder. In the actual working process of the hydraulic cylinder, due to friction and the action of pollutants in the oil, it will inevitably lead to the wear of the piston rod seal of the hydraulic cylinder, which will affect the working performance and quality of the hydraulic cylinder, and even cause serious accidents. For this problem, two methods are usually adopted, one is to replace the worn seal, but the replacement process will affect the working efficiency of the hydraulic cylinder, and due to the lack of a suitable monitoring method, when to replace it is also an unresolved problem; the other is The solution is to try to compensate for seal wear. [0003] The exis...

AI Technical Summary

Problems solved by technology

However, due to the lack of monitoring of the wear state of the piston rod seal of the hydraulic cylinder in these current compensation methods, the normal contact force of the seal will increase during the compensation process, but the tangential friction force will also increase at the same time, which will not only affect the hydraulic pressure. The working efficiency of the cylinder will also increase the wear of the sealing contact parts

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