Highly telescopic hydraulic support for low coal seam

Abstract

The invention discloses a highly telescopic hydraulic support for a low coal seam, which comprises a base, a top beam and a shield beam, wherein two upright posts are symmetrically arranged between the top beam and the base, and two balancing jacks are symmetrically arranged between the top beam and the shield beam hinged with the top beam; a front connecting rod and a rear connecting rod are respectively hinged between the shield and the base, the middle part of the base is provided with a push jack, and the push jack is hinged with a push rod; an axial slotted hole is arranged in the wall of a middle cylinder of the upright posts, an upper opening and a lower opening, which are communicated with the slotted hole, are arranged in the internal wall and the external wall of the middle cylinder, the upper opening is communicated with the upper cavity of the middle cylinder, and the lower opening is communicated with the upper cavity of an external cylinder; the rear part of the base is provided with two free positions corresponding to the balancing jacks; the front end and the rear end of the push rod are respectively provided with a pair of joint seats; each joint seat is provided with a through hole communicated with a liquid inlet and outlet steel pipe arranged in the cavity of the push rod and a fixing hole, of which the side wall is provided with a holding hose; and the topbeam and the base are made of Q800 material. The support is highly telescopic, has a reasonable pedestrian passageway in a low position state, and can satisfy the mining requirement of an unstable high coal seam.

Description

technical field [0001] The invention relates to a thin coal seam hydraulic support with super large expansion and contraction ratio. The utility model belongs to the field of mining and is used for mining working faces of long-wall thin coal seams in coal mines. Background technique [0002] my country's thin coal seam reserves below 1.3m account for about 20% of the country's total coal reserves, and the thin coal seam reserves of state-owned coal mines alone have more than 6.15 billion tons. More than 85% of the mining areas have thin coal seams. The thin coal seam resources are not only widely distributed but also mostly high-quality coal. The thin coal seam reserves in Sichuan, Shandong, Heilongjiang and other mining areas all exceed 50%. The thin coal seam mining operation space is narrow, and it is difficult to ensure ventilation safety, which is a major mining technical problem at home and abroad. For a long time, a large number of thin coal seams have been abandone...

AI Technical Summary

Problems solved by technology

[0007] In the design of the thin coal seam hydraulic support, in order to improve the expansion ratio of the support and ensure the pedestrian passage in the low position of the hydraulic support, the thickness of the box structure at the front end of the top beam and the front end of the base is relatively thin, and its strength limits the increase in the working resistance of the hydraulic support. The bracket cannot meet the needs of underground safety support

[0008] (3) The layout of the bracket hose affects the pedestrian passage

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