Two column protected type hydraulic prop frame for low position blasting down the roof coal

Abstract

The invention discloses a two-leg shield-type sublevel caving hydraulic support, which comprises an open-crotch type pedestal and two hydraulic extension legs equipped on the open-crotch type pedestal, wherein the top ends of the two hydraulic extension legs are respectively hinged with a top beam; the back part of the top beam is hinged with the upper part of a shield beam; the lower part of the shield beam is hinged with the open-crotch type pedestal via a four-bar linkage mechanism; a balancing lifting jack is equipped between the back part of the top beam and the shield beam; a tail beam with box type construction is disposed at the lower end of the shield beam, a tail beam lifting jack is equipped between the lower part of the tail beam and the lower part of the shied beam; and a slide track, an inserting plate equipped in the slide track and a inserting plate lifting jack for driving the inserting plate to carry out reciprocating movement along the slide track are equipped in the box of the tail beam. The invention integrates shield-type support and sublevel caving technique, and adopts two-leg caving support, so that the structure is simple and compact, and the center distance between the front and back slides is effectively decreased. The invention is also helpful for the ascending, movement and descending operation of the support.

Description

technical field [0001] The invention relates to a hydraulic support for mining working faces in underground coal mines, in particular to a two-column shielding type low-position top-coal caving hydraulic support. Background technique [0002] The top-coal caving support came into being with the top-coal caving mining method. After comprehensive mechanized mining was applied to the top-coal caving mining face, the top-coal caving mining technology entered a new stage of development. The popularization and use of top-coal caving fully mechanized mining technology has expanded the application scope of comprehensive mechanized mining, simplified the mining system and production organization of the mine, greatly improved the labor productivity and output of fully mechanized mining face, and reduced the production cost of coal , and achieved significant technical and economic effects in coal mine production. [0003] The currently used top-coal caving support generally adopts the...

AI Technical Summary

Problems solved by technology

However, with the massive investment in the construction of high-yield and high-efficiency mines, the size of the conveyor and shearer equipment has increased, and the size of the hydraulic support has also increased accordingly. Therefore, the operation of the hydraulic support and the management of the front and rear conveyors in mining work brought many difficulties

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