Double-column top coal caving hydraulic support having large mining height and provided with three-stage top coal recovery devices

Abstract

The invention discloses a double-column top coal caving hydraulic support having a large mining height and provided with top coal recovery devices, and the largest height is larger than 6 m. The top coal recovery devices are divided into three stages: the first stage adopts a swing type tail beam, vertical swing of the swing type tail beam is controlled by two tail beam jacks hinged with a shield beam, and opening and closing of a coal discharge port are realized; the second stage adopts a retractable type coal discharge beam device, the retractable type coal discharge beam device is controlled by a plugboard jack to stretch and retract in the first-stage swing type tail beam, coal breaking teeth in a rectangular pyramid or cone shape are arranged at the upper part of the end of the second-stage coal discharge beam, and coal discharge and breaking functions are realized; the third stage adopts a hinged type coal discharge and return plate beam, the hinged type coal discharge and return plate beam is hinged to the lower part of the end of the second-stage retractable type coal discharge beam, can move with the stretching and retracting of the second-stage coal discharge beam and can be controlled by a coal return jack to retract, and coal breaking and loading functions are realized. The double-column top coal caving hydraulic support is applied to full-mechanized caving mining of hard coal resources with the thickness larger than 8 m, and the problems about top coal caving and recovery are solved obviously.

Description

technical field [0001] The invention relates to a top-coal caving mining equipment for extra-thick hard coal seams, in particular to a top-coal recovery device for a hydraulic support for top-coal caving, which belongs to the field of mining. Background technique [0002] There are mainly two mining methods for coal seams thicker than 8m: layered and fully mechanized caving mining, among which fully mechanized caving mining has the advantages of high production efficiency, less roadway excavation, and easy management, and has become the main development direction of coal seam mining thicker than 8m in my country. During the "Eleventh Five-Year Plan" period of our country, a hydraulic support for large mining height top coal caving was developed. The maximum height of mechanical mining is 5m, and the goal of mining 20m thick coal seams has been realized, and unprecedented results have been achieved. Achieving an annual output of more than 10 million tons provides a basis for ...

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Problems solved by technology

The invention can solve the problem of caving and recovery of hard top coal in thick coal seams

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