Railway wagon brake beam fatigue test bench guide sleeve clearance elimination device

Abstract

The invention discloses a railway wagon brake beam fatigue test bench guide sleeve clearance elimination device, which is used for eliminating clearance between the guide sleeve and a test bench baffle in the railway wagon brake beam fatigue test. The device comprises a first adjusting device and a second adjusting device which are used in a pair, wherein each of the first adjusting device and the second adjusting device comprises a pressing plate, an inner adjusting shaft and a lower adjusting block; the lower adjusting block is arranged on the inner adjusting shaft, and the two are in threaded connection; a shaft groove is arranged in the pressing plate, and the inner adjusting shaft passes through the shaft groove; and one surface, facing the guide sleeve, of the lower adjusting block is an oblique surface, and the oblique surface is fit with the outer wall of the guide sleeve. After the clearance between the baffle and the guide sleeve is eliminated, the brake beam can be prevented from being unreasonably impacted during a loading process, accuracy of a test result is ensured, and reduction of the test loading frequency can be avoided. After the clearance is eliminated, loading in the test is ensured to be carried out at a set frequency, and the test efficiency is ensured; and the tested brake beam can be ensured to be always at the correct test position, and accuracy of the test result is thus ensured.

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 of evaluating the reliability of the brake beam. TB / T1978-2007 "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...

AI Technical Summary

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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