A method for monitoring performance degradation of rubber seals based on contact stress
A technology of rubber seals and contact stress, applied in the direction of measuring devices, strength characteristics, instruments, etc., can solve the problems of large errors in the degradation law of rubber seals, performance degradation and changes of rubber seals, etc.
Inactive Publication Date: 2016-05-04
BEIHANG UNIV
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Problems solved by technology
This test method will not only introduce errors in manual measurement, but also the inconsistency of front and rear assembly will also cause changes in the degradation law of rubber seals.
Therefore, the performance degradation law of rubber seals obtained by traditional methods has the problem of large errors or even inconsistent laws.
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[0029] The technical solution of the present invention will be specifically described below in conjunction with the drawings and embodiments.
[0030] There are three main aspects of rubber degradation: physical factors, chemical factors, and biological factors. Considering the actual working environment, the degradation of rubber seals is mainly due to the action of mechanical stress and the chemical reaction of thermal oxidation. Under the action of these reactions, the performance of rubber seals will be significantly degraded, which is characterized by the change of contact stress on the sealing surface of rubber seals. The method of the invention utilizes the monitoring of the contact stress of the rubber seal in the mechanism to complete the monitoring of the performance degradation of the rubber seal. The following describes in detail how to use the change of the contact stress of the rubber seal during the degradation process to characterize the degradation condition ...
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The invention provides a contact stress-based rubber sealing piece performance degradation monitoring method, and the contact stress of a rubber sealing piece is selected as the performance degradation characteristic value of the rubber sealing piece. The method comprises the steps of firstly, setting the installation position of a pressure sensor on a mechanism loaded with the rubber sealing piece; secondly, arranging the rubber sealing piece and the pressure sensor in the mechanism; after that, measuring the contact stress F(t) by the pressure sensor after the rubber sealing piece is arranged in the mechanism for a period of t; and finally, comparing the F (t) with a failure criteria F of the sealing piece provided by the design of the mechanism, wherein when the F (t) is more than F, the rubber sealing piece has failure, and when the F(t) is measured, temperature excursion correction is carried out on the contact stress measured by the pressure sensor. The method can more directly reflect the performance degradation of the rubber sealing piece than a method utilizing a permanent compression deformation rate, and the contact stress of the rubber sealing piece can be measured by the pressure sensor; the measurement is simple, and disassembly is not needed.
Description
technical field [0001] The invention belongs to the fields of performance degradation monitoring, failure diagnosis and life prediction of rubber seals, and in particular relates to a monitoring method for performance degradation of rubber seals based on contact stress. Background technique [0002] Rubber materials have high elasticity, excellent oil resistance, water resistance, wear resistance, low compression deformation and good processing performance, so they are widely used in various construction machinery. At the same time, rubber, as a kind of polymer material, has also been widely concerned about its degradation and failure. Rubber seals are widely used in hydraulic systems. They play the role of sealing, vibration and noise reduction and protection in a large number of servo mechanisms, and are an indispensable part of servo mechanisms. The failure of rubber seals can have a huge impact on the entire servo mechanism, possibly leading to a major failure of the en...
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IPC IPC(8): G01N3/00
Inventor 王少萍洪葳梁贤赓石健
Owner BEIHANG UNIV