Lag working face end top coal caving hydraulic support

Abstract

The invention discloses a lag working face end top coal caving hydraulic support. The hydraulic support comprises a front frame and a rear frame which are split, wherein the front frame and the rear frame are connected through a pushing jack, a bottom protection steel plate is arranged between a left base and a right base of the front frame, a telescopic forepoling bar is arranged in a second topbeam of the rear frame and comprises a frame structure and a front tip, the second top beam and a third top beam of the rear frame and a second base and a third base are hinged through hinge pins, thedetachable hydraulic support can be additionally arranged, and a safety guard plate and a large-area gangue baffle are arranged on the third base of the rear frame. According to the hydraulic support, temporary supporting of a top plate can be achieved in the moving driving process, the empty top area in the moving driving process is reduced, and the advantages that the bottom heaving phenomenonis restrained, a support base is prevented from sinking, and the coal output gangue content is low are achieved.

Description

technical field [0001] The invention relates to the technical field of mine equipment, in particular to a hydraulic support for caving coal at the end of a lagging working face. Background technique [0002] The end top coal caving hydraulic support is an important equipment in the end top coal caving process of the working face, and it has the function of supporting the end top plate and the end top coal caving. Since the end of the working face is at the intersection of mining and transportation equipment, the equipment is densely arranged, and the surrounding rock at the end is under the action of various support pressures, the mine pressure is complicated, and the hydraulic support at the end is required for safety support. However, the existing The hydraulic support at the end of the hydraulic support has the problems of poor stability, poor safety protection facilities, and difficulty in moving the frame; if there is coal left on the roof, safety problems such as spont...

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Problems solved by technology

Since the end of the working face is at the intersection of mining and transportation equipment, the equipment is densely arranged, and the surrounding rock at the end is under the action of various support pressures, the mine pressure is complicated, and the hydraulic support at the end is required for safety support. However, the existing The hydraulic support at the end of the hydraulic support has the problems of poor stability, poor safety protection facilities, and difficulty in moving the frame; if there is coal left on the roof, safety problems such as spontaneous combustion of the left coal are prone to occur in the goaf, so it is necessary to put the top coal at the end, and put the top coal on the top of the end. In the case of natural coal caving, because the end is suspended from the top and the pressure is lagging behind, the hydraulic support for caving coal at the end needs to be arranged with other supports on the lagging working face; when caving the top coal at the end of the lagging working face, there are supports close to the gob side The accumulated gangue falls into the transfer machine, causing the problem of high gangue content

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