Hydraulic support and bottom lifting device thereof

Abstract

The invention discloses a bottom lifting device used for a hydraulic support. The hydraulic support comprises a base (9) formed by a left base (91) and a right base (92); the bottom lifting device comprises a power part, a left swinging block (23) and a right swinging block (24); the middle part of the left swinging block (23) is pivoted with the left base (91) by a hinge pin (26), the middle part of the right swinging block (24) is pivoted with the right base (92) by the hinge pin (26), the two hinge pins (26) are both parallel to the base (9) and are parallelly arranged on the whole, and the power part acts on the left end part of the left swinging block (23) and the right end part of the right swinging block (24), so that the left swinging block (23) and the right swinging block (24) relatively rotate surrounding the hinge pins (26) respectively. The invention also discloses a hydraulic support comprising the bottom lifting device. On the basis of realizing enough lifting height and lifting load, the hydraulic support and the bottom lifting device thereof occupy smaller height space and meet the bottom lifting requirement of hydraulic supports in thin seams.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a bottom lifting device for a hydraulic support. In addition, the present invention also relates to a hydraulic support comprising the above-mentioned bottom lifting device. Background technique [0002] my country is the main coal-producing country in the world. The total number of coal mines exceeds the sum of the number of coal mines in all other countries in the world, and the reserves of thin coal seams account for 17.5% of the total reserves of coal. With the improvement of the country's requirements for coal recovery rate, more and more thin coal seams are mined. At the same time, comprehensive mechanized coal mining has become the main method for mining thin coal seams. [0003] The hydraulic support is the support equipment for comprehensive mechanized coal mining. Its main function is to support the roof of the stope, maintain the working space of the she...

AI Technical Summary

Problems solved by technology

[0007]Because the hydraulic cylinders of the bottom lifting device in the prior art are arranged vertically, and the lifting distance of the bottom lifting device is determined by the stroke of the hydraulic cylinder, therefore , to obtain a sufficient lifting distance, the hydraulic cylinder must have sufficient length, but for the hydraulic support used to mine thin coal seams, the height space is very limited, and the traditional bottom lifting device cannot meet the needs of bottom lifting; however, due to the thin coal seam The height of the hydraulic support is low, and the inclination angle of its column is relatively large, which further aggravates the problem of the front end of the base sinking. There is an urgent need for a bottom lifting device that can meet the needs of the thin coal seam hydraulic support.

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