Multichannel high-speed rail overhead line system dropper fatigue test device

Abstract

The invention relates to a multichannel high-speed rail overhead line system dropper fatigue test device. The device is applied to dropper fatigue test in high-speed rail overhead line systems, and comprises an upper cross beam (1), a support rod (2), an upper end clamping device (3), a dropper (4), a lower end clamping device (5), a working platform (6), a base (7) and a test machine monitoring system. The device has a function of carrying out fatigue test on a plurality of droppers at the same time according to national standard, and is capable of simulating the working states of droppers under the working conditions of different vehicle speeds through loading, for force and displacement of the droppers, of a high-speed electric cylinder so as to complete the fatigue test, thereby providing basis for predicting fatigue life of the droppers and satisfying the requirement for customizing related fatigue standards by the railway department.

Description

technical field [0001] The invention belongs to the technical field of high-speed railway catenary, and relates to a catenary suspension string fatigue test method and device. Background technique [0002] Catenary, as a line that directly supplies power to electric locomotives, when the high-speed rail is running, the pantograph on the top of the locomotive contacts the catenary, so as to obtain the power for continuous and stable operation. Catenary is a key component of high-speed electrified railway, which directly affects the safe and stable operation of electrified railway. [0003] The catenary generally includes components such as contact wires, catenary cables, hanging strings, elastic slings, wrist arms, and pillars. Among them, the suspension string, as the connection between the catenary wire and the catenary cable, undertakes the transmission of vibration and force between the two, and is one of the key components of the catenary. In the process of field opera...

AI Technical Summary

Problems solved by technology

This method has two disadvantages. One is that in the actual operation process, when the high-frequency test is carried out, the maximum acceleration of the weight / weight downward movement is only the acceleration of gravity, while the acceleration of the movement of the weight tray will be much greater than the acceleration of gravity , patents CN201720777240.1 and CN201710511861.X weights / weights will be separated from the tray, and the test cannot be completed; the second is that the fatigue damage of the hanging string in this scheme is actually caused by the impact force of the weights rather than gravity, patent CN201721426702 .1. In CN201711043723.X and CN201810139844.2, the free fall of heavy objects is used to load the force. When the test machine is actually working, a free fall of heavy objects will cause the hanging string to vibrate multiple times, which cannot simulate the actual situation. The function of the string cannot accurately detect the life of the hanging string; (2) patents CN201721426702.1, CN201711043723.X, CN201720777240.1 and CN201710511861.X use spring springs for buffering, for millions or even tens of millions of fatigue tests , the life of the spring often does not meet the requirements, and the spring will affect the loading force of the suspension string, and the force will continue to change with the loss of the spring. The connection of the suspension string is relatively large; (3) patents CN201721426702.1, CN201711043723.X and CN201810139844.2 use eccentric wheels or rotating lifting parts to carry out displacement loading of the suspension string, and only a few fixed compressions are available. When other When compressing the amount, it is necessary to redesign and process the eccentric wheel or the rotating lifting part, which is very inconvenient to use

(4) The previous 5 patents used the half-period sinusoidal curve in the national standard to carry out displacement loading on the hanging string. During the actual movement, the moving speed and acceleration of the hanging string at the beginning and end of the displacement loading are not zero, and the displacement loading exists. Inaccurate and difficult to realize; (4) patents CN201720777240.1 and CN201710511861.X are single channels, and only one suspension string can be tested at a time, which is inefficient for fatigue tests that need to be repeated millions of times

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