Testing method and device for service fatigue performance of hydraulic reciprocating seal

Abstract

The invention relates to a testing method and device for the service fatigue performance of a hydraulic reciprocating seal. A servo motor system provides a variable load for a hydraulic cylinder, a hydraulic system is used to control the reciprocating motion of a test cylinder, and a temperature controlling system is used for the control of the oil temperature, thereby realizing the simulation ofthe actual working condition of the hydraulic reciprocating seal. The contact stress of the hydraulic reciprocating seal is measured by a fiber grating strain sensor laid on the inner side of a pistonguide sleeve to realize the monitoring of the service state of the seal. The analysis and judgment of the fatigue failure state of the hydraulic reciprocating seal are realized by calculating the fatigue failure probability of the hydraulic cylinder / piston seal load friction pairs system. The fatigue life testing result of the hydraulic reciprocating seal under specific service conditions can beobtained through testing, which provides a basis for the reliability design of the hydraulic reciprocating seal.

Description

technical field [0001] The invention relates to a method and a test device for testing the service fatigue performance of a hydraulic reciprocating seal. Background technique [0002] Hydraulic reciprocating seals are important components in hydraulic cylinders and are widely used in equipment such as aerospace, construction machinery, automobiles, petrochemical and metallurgy. During the actual service of the hydraulic cylinder, the hydraulic reciprocating seals will be under the combined action of pre-compression stress, periodic alternating oil pressure and friction generated during reciprocating motion, and will be in a complex stress state. Under long-term working conditions prone to fatigue failure. The consequences not only result in leaks from hydraulic cylinders, but also a potential safety risk. Therefore, it is of great significance to study the fatigue performance of hydraulic reciprocating seals under service conditions to timely and accurately predict the fat...

AI Technical Summary

Problems solved by technology

However, the test device did not consider the influence of conditions such as oil temperature and reciprocating motion speed during the actual movement of the hydraulic cylinder; Xi Weimin designed a multifunctional hydraulic reciprocating seal fatigue life testing machine (reference: Xi Weimin. Multifunctional hydraulic reciprocating seal Parts fatigue life testing machine [P]. Zhejiang: CN201974340U, 2011-09-14.), which can record various test parameters such as oil pressure, operating speed, and oil temperature of hydraulic reciprocating seals during operation at one time. Provide accurate test data for seal experimenters

However, the test device cannot accurately predict the fatigue failure of the hydraulic reciprocating seal during operation, and the fatigue life data of the seal cannot be obtained through the test

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