Test stand for testing comprehensive brake property of brake pad of high speed train

Abstract

The invention provides a test stand for testing a comprehensive brake property of a brake pad of a high speed train. After extending out via a rolling bearing, a shaft of a servo motor is connected with a brake disc; and a cylinder is mounted on a sliding seat in the transverse direction, an output shaft of the cylinder is connected with a push rod after a spring sleeves the output shaft of the cylinder, the push rod penetrates out from a linear bearing and then is successively connected with a three-directional force sensor, a pad support and a mounting plate, a three-directional accelerationsensor is mounted on the mounting plate, friction blocks in different sizes and shapes are fixed on the mounting plate, the sliding seat is in sliding fit with a first supporting seat, a ball screw is longitudinally mounted on the first supporting seat, and a sliding table is fixed on a nut of the ball screw. A base is provided with a thermal imager and a microphone. The test stand has the advantages that the mounting plate is convenient to change, a friction radius is convenient to adjust, functions of vibration resisting and jitter resisting are fulfilled, and the stability of the test stand and the accuracy of tests are improved.

Description

technical field [0001] The invention relates to a performance testing device for train brake pads, in particular to a test bench for testing comprehensive properties such as vibration signals, force signals and frictional heat distribution of the friction interface of the brake pads. Background technique [0002] The brake pads of high-speed trains are designed with multiple friction blocks. During mechanical braking, the friction between these friction blocks and the brake disc is mainly used to perform braking. With the continuous increase of the running speed of high-speed trains, when the train is braking, the unreasonable arrangement of friction blocks will inevitably lead to uneven friction heat distribution of the brake disc in the friction area and excessive temperature difference in the friction area. Furthermore, the wear and tear of each friction block on the brake pad is uneven, which affects the service life of the brake pad; at the same time, it causes abnormal...

AI Technical Summary

Problems solved by technology

With the continuous increase of the running speed of high-speed trains, when the train is braking, the unreasonable arrangement of friction blocks will inevitably lead to uneven distribution of friction heat in the friction area of ​​the brake disc and excessive temperature difference in the friction area.

In turn, the friction blocks on the brake pads are unevenly worn, which affects the service life of the brake pads; at the same time, it causes abnormal wear and thermal cracks of the brake disc

Abnormally worn brake pads and brake discs will affect the fit of the friction interface, further worsening the difference in friction heat distribution in the friction area

When the temperature difference in the friction area reaches a certain level, thermal stress concentration will occur, causing a series of problems such as vibration and noise, friction block breakage, and block loss, which will seriously affect the driving safety of the train.

In order to improve the service life of brake discs and brake pads and the reliability of the train braking system, it is necessary to study the arrangement of brake pad friction blocks and the self-excited vibration of the friction interface, the stress distribution of the friction interface, the friction heat and its distribution. However, the existing high-speed train brake test bench does not take these factors into consideration in its test focus, and the arrangement characteristics of the friction blocks of the high-speed train brake pads The influence of the comprehensive braking performance of train brake pads requires special test equipment

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