Multi-condition fatigue test system for tread brake unit

Abstract

A multi-condition fatigue test system for a tread brake unit comprises a front bracing frame, a back bracing frame and a mounting base arranged on a test platform as well as a tread profiling module,a tangential force application cylinder, a reciprocating vibration cam mechanism and a traverse force application cylinder. The tangential force application cylinder provides a tangential power to push the tread profiling module to swing, so that the brake condition of a wheel in the rotation process is thus simulated; the traverse force application cylinder provides a transverse power to push thepromotion tread profiling module to make traverse reciprocal motion, so that traverse play of the wheel relative to the frame during braking is simulated; and the reciprocating vibration cam mechanism drives the tread profiling module to make vertical reciprocal motion, and reciprocal vibration load on the tread brake unit caused by the tread in the brake process due to out-of-roundness of the wheel is simulated. Test in the three different conditions can be implemented independently or together, the condition combined test does not interfere each other, and the using condition of the vehicleis approached more.

Description

technical field [0001] The invention relates to a fatigue test system for simulating the combination working condition of an existing vehicle for a tread braking unit. Background technique [0002] The tread braking method is widely used in rolling stock, urban rail transit vehicles and some rail engineering vehicles. The tread braking unit proposed in the present invention is similar to the tread braking unit mentioned in the authorized patent CN103693069B, and is an actuator of a rail transit vehicle braking system. The braking method is as follows: fill the brake with compressed air, so that the brake shoe support of the brake protrudes toward the wheel set, and drives the brake shoe to press the outer arc surface of the wheel set, thereby generating friction. This friction prevents the wheelset from continuing to rotate, thus achieving the braking effect. [0003] In order to verify the reliability and durability of the braking action of the tread brake unit, a fatigue...

AI Technical Summary

Problems solved by technology

In the above-mentioned existing test methods, the tread profiling device is completely fixed, that is, static, so that it is impossible to verify the reliability and durability of the tread braking unit in the current vehicle operation process, that is, it is impossible to verify that due to the wheel tread The tangential force generated by the friction with the brake shoe, the lateral force generated by the lateral movement of the wheel set relative to the frame, and the periodic reciprocating vibration load caused by the out-of-round wheel, etc. have a great impact on the reliability and durability of the tread brake unit. sexual influence

[0004] Even though the test rigs invented by patent CN105806611A and CN107063662A separately involve the simulation of the working conditions of the presence of lateral force and the simulation of the working conditions of the existence of out-of-round wheels, the simulation conditions of the test rigs invented by the above patents are single and cannot be more realistic. Simulate the combined working conditions of the existing vehicle

It uses the tread profiling device and the transmission mechanism as a whole, and the type is single, which cannot be applied to the fatigue test process of various products, and cannot meet the fatigue test requirements of the existing tread brake unit

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