Gap Elimination Device for Guide Bush of Railway Freight Car Brake Beam Fatigue Test Bench

Abstract

The utility model relates to a guide sleeve gap elimination device for a railway freight car brake beam fatigue test bench, which is used to eliminate the gap between the guide sleeve and the test bench baffle plate in the fatigue test of the railway freight car brake beam. Including adjusting device I and adjusting device II used in pairs, the adjusting device I and adjusting device II both include a pressure plate, an inner adjustment shaft and a lower adjustment block; the lower adjustment block is installed on the inner adjustment shaft, and the two are threaded; the pressure plate A shaft groove is opened on the top, and the inner adjustment shaft passes through the shaft groove; the side of the lower adjustment block facing the guide sleeve is an inclined surface, and the inclined surface is bonded to the outer wall of the guide sleeve. After the gap between the baffle plate and the guide sleeve is eliminated, it can avoid unreasonable impact on the brake beam during the loading process, ensure the accuracy of the test results, and avoid the reduction of the test loading frequency. After the gap is eliminated, it can ensure that the test is loaded at the set frequency to ensure the test efficiency; and it can ensure that the tested brake beam is always in the correct test position, thereby ensuring the accuracy of the test results.

Description

technical field [0001] The invention relates to an auxiliary test device for railway freight cars, in particular to a clearance eliminating device for guide sleeves of a brake beam fatigue test bench for railway freight cars. Background technique [0002] The brake beam is the most important part of the basic braking device of the railway freight car. When the vehicle is performing braking operation, the braking force can be transmitted to the brake shoe through it, so as to realize the braking of the vehicle. The fatigue test of the brake beam is an important means to assess the reliability of the brake beam. TB / T 1978-2007 "Combined Brake Beam for Railway Freight Cars" stipulates the requirements for the fatigue test of the brake beam. [0003] In the fatigue test of the brake beam, the installation gaps affecting the test results should be eliminated, so that the load can be applied at a set frequency during the test without increasing the load application distance; at th...

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Problems solved by technology

[0005] The current approach is very simple, but the disadvantages are also great

During the fatigue test of the brake beam, with the vibration of the brake beam, the iron sheet between the baffle plate and the guide sleeve often becomes loose, that is, the installation gap appears at this place. The restraining effect of the guide sleeve is not ideal. If it is not treated, the gap will gradually increase. The consequence of this is that the accuracy of the fatigue test results of the brake beam cannot be guaranteed. At the same time, the test loading frequency has dropped seriously, and the normal test cannot be performed.

Since the number of fatigue tests is 1 million times, and the normal test time for one brake beam is about 5 days, it is impossible to manually monitor the change of the installation gap during the whole test process

Since the guide sleeve of the brake beam is not a regular plane, it cannot be well restrained when the iron plate is used to eliminate the installation gap, and the inconsistency of the thickness of the iron plate will cause the position of the guide sleeve to change, which will affect the brake beam on the test bench. exact installation on

[0006] For the fatigue test, which has a long loading time and high test frequency, it is very unreliable to use a simple iron plate to eliminate the installation gap, and a little carelessness will affect the accuracy of the test results of the specimen.

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