Method for determining subway busbar aluminium alloy section tension

Abstract

The invention discloses a method for determining subway busbar aluminium alloy section tension. The method comprises the following steps: a. loading a force: symmetrically loading on two sides of a dovetail groove of the subway busbar to be measured so as to generate a relative opening displacement of the two sides of the dovetail groove; b. collecting data: measuring the relative opening displacement of the two sides of the subway busbar dovetail groove and the corresponding load; c. processing the data: taking the displacement as an abscissa and the load as an ordinate so as to set a two dimension coordinate system, drawing a coordinate graph according to the collected data in the step b, calculating a linear coefficient in a linear equation according to the coordinate graph and then calculating the tension; d. finally comparing a tension determination result with a tension index provided by a product technology condition so as to know whether the product is qualified. By using the method, the tension of the subway busbar can be determined accurately. A factory pass rate of the product can be guaranteed. Resource wastes caused by improving subway busbar tension blindly can be avoided and costs can be reduced.

Description

technical field [0001] The invention relates to a method for detecting the strength of a material structure, in particular to a method for measuring the tension force of an aluminum alloy profile of a subway bus bar. Background technique [0002] The subway busbar is an aluminum alloy profile similar to π-shaped in cross section. The product has a nominal length of 12000mm, a cross-section of 2213.7mm2, a calculated weight of 5.977kg / m, a resistivity of 0.0329Ω m at 20°C, and a continuous carrying capacity ≥ 3700A. The technical conditions of the product stipulate that the maximum tension force at the dovetail groove of the busbar is 3N / mm when one side of the dovetail groove is opened by 1mm, which is the inspection index of the subway busbar product. Through a large number of tests, it is found that the relative opening displacement of the two sides of the dovetail slot of the busbar has a linear relationship with the corresponding load within a certain range. The tensio...

AI Technical Summary

Problems solved by technology

[0003] In view of the above shortcomings, it is necessary to provide a method for measuring the tension force of subway bus bars, which can accurately measure the tension force of subway bus bars, ensure the qualified rate of products, and overcome the problems caused by blindly increasing the tension force of subway bus bars. Waste of resources, reduced costs

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