A Method for Detecting Effective Pushing Stroke of Hydraulic Support

Abstract

The invention discloses a method for detecting the effective push stroke of a hydraulic support. A pressure sensor is mounted at a rear chamber oil hole of a push jack, and a displacement sensor is mounted on the surface of a piston rod of the push jack; an oil pressure value is detected by the pressure sensor in real time in the entire push-to-slide process, and the extension amount of the pistonrod is detected by the displacement sensor in real time; as the thrust applied by the push jack in the idle stroke section is greatly different from the thrust of the push jack in the effective pushstroke section after the push jack contacts with a middle slot of a scraper conveyor, an oil pressure value greatly changes during transition of the two, according to the piston rod extension amount corresponding to the suddenly-changed oil pressure value measured by the pressure sensor, the distance in the idle stroke section can be acquired, and the result of the total extension amount of the piston rod subtracting the distance of the idle stroke section is the effective push-to-slide displacement of the hydraulic support relative to the middle slot of the scraper conveyor. The method is advantaged in that the hydraulic support is pushed to slide to arrive at the required position, and the supporting effect of the hydraulic support for coal seam top boards and subsequent coal mine exploitation of the scraper conveyor are guaranteed.

Description

technical field [0001] The invention relates to a method for detecting the effective pushing stroke of a hydraulic support, which belongs to the technical field of coal mining. Background technique [0002] When the shearer is cutting coal in the fully mechanized mining face, the hydraulic support is required to support the exposed coal seam roof in time, and the process of moving the hydraulic support and pushing the scraper conveyor is realized through the moving jack connected between the two. Such as image 3 As shown, the push jack and the middle trough of the scraper conveyor are connected through the push lug. During this process, the thrust of the push jack is loaded on the push lug of the middle trough, and its force-bearing surface is a circular arc surface with a certain inclination angle. Since the moving ear of the middle groove is an oblong hole, and there is a gap between the connecting pin shaft and the pin hole of the pushing jack, and the gap between the tw...

AI Technical Summary

Problems solved by technology

However, this method can only reflect the protruding amount of the piston rod in the push jack of each hydraulic support, which is the push displacement of the push jack, and still cannot remove the empty travel section in the push process of the push jack, so it is not hydraulic pressure. The error between the effective pushing displacement of the support to the middle groove of the scraper conveyor and the effective pushing displacement is still large

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