Coalface floor stepping type hydraulic supporting frame

Abstract

A coalface floor stepping type hydraulic supporting frame comprises a left support and a right support, top beams of the supports are connected with bases through hydraulic lift cylinders, the left support base is provided with a left support-fixing arm, the right support base is provided with a right support-fixing arm, the body of a hydraulic telescopic cylinder is articulated with the left support-fixing arm, the piston rod of the hydraulic telescopic cylinder is articulated with the right support-fixing arm, the hydraulic telescopic cylinder is connected with a third control valve through an oil line, the left hydraulic lift cylinders are connected with a second control valve through oil lines, the right hydraulic lift cylinders are connected with a first control valve through oil lines, and the first control valve, the second control valve and the third control valve are respectively connected with an oil inlet tube and an oil outlet tube. The left support top beam and the right support top beam can advance in turn by means of the hydraulic telescopic cylinders, consequently, the head-supporting time and the tail-supporting time are shortened, and personal injury accidents caused by the manual moving of the top beams and single beams are prevented; because the left support top beam and the right support top beam are extend ed forward from the bases, the unsupported area of the a roof is reduced, and the supporting range is broadened.

Description

technical field [0001] The invention relates to supporting equipment for a coal mining face in a mine, in particular to a bottom step hydraulic support frame for a coal mining face. Background technique [0002] At present, among the mine accidents in our country, the death toll caused by roof accidents accounts for more than 40%. With the gradual improvement of the degree of mechanization of underground coal mines, mines have higher and higher requirements for mining technology, and the scope of use of underground mechanical equipment in mines has become wider and wider. For the coal mining face with deep coal seam, large-scale mechanical equipment can be used to support the end. However, for the coal mining face with thin coal seam, the space height of the coal seam is relatively short, and large mechanical equipment cannot be used for support. Usually small hydraulic supports are used for support. The original coal mining face machine head, machine tail general mining s...

AI Technical Summary

Problems solved by technology

The original coal mining face machine head, machine tail general mining section and coal mining face end support methods are all based on manual cooperation. It takes a long time to support the machine head and machine tail, and manual cooperation is difficult to ensure the support. Safety, often causing personal injury accidents, and the labor intensity of workers is relatively high

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