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

Abstract

The invention discloses a four-leg shield-type sublevel caving hydraulic support, which comprises four supporting hydraulic extension legs equipped on a pedestal. The top ends of the four supporting hydraulic extension legs are respectively hinged with a top beam; a forward extension beam is hinged at the front end of the top beam; a sprag is hinged at the front end of the forward extension beam, a sprag lifting jack is equipped on the forward extension beam, an ejector rod of the sprag lifting jack is hinged with the back part of the sprag; 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 pedestal via the a four-bar linkage mechanism; a tail beam with box-shaped construction is hinged with 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 is especially suitable for caving integrated mining working face under pitching coal bed, flat-pitching half hard coal bed and 'three-soft' coal bed conditions.

Description

technical field [0001] The invention relates to a hydraulic support for mining working faces in underground coal mines, in particular to a four-column support shielding type low-position top-coal caving 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. With the massive investment in the construction of high-yield and high-ef...

AI Technical Summary

Problems solved by technology

With the massive investment in the construction of high-yield and high-efficiency mines, the size of the conveyor and shearer equipment is increased, and the size of the top-coal caving support is required to be increased accordingly, and the size of the existing four-column support shielding low-position top-coal caving support is increased. It also brings many difficulties to the operation of the support and the management of the front and rear conveyors of the mining work, which will inevitably reduce the labor productivity and output of the fully mechanized mining face.

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