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Hydraulic support pushing jack for half-well cutting coal-mining process

A technology of pushing jacks and hydraulic supports, applied in mine roof supports, mining equipment, earth-moving drilling, etc., can solve the problems of signal transmission delay, unstable pushing speed, and low precision of piston rod stroke control.

Inactive Publication Date: 2021-02-26
ZHENGZHOU COAL MINING MACHINERY GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006]The second option is to install a displacement sensor on the pushing jack, and transmit the data obtained by the displacement sensor to the support controller, and control the opening and closing of the electric control valve through the support controller. To realize the start and stop of the jack action, due to the delay of signal transmission and the instability of the moving speed, there is a problem that the control accuracy of the piston rod stroke is not high

Method used

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  • Hydraulic support pushing jack for half-well cutting coal-mining process
  • Hydraulic support pushing jack for half-well cutting coal-mining process
  • Hydraulic support pushing jack for half-well cutting coal-mining process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 with figure 2 As shown, a hydraulic support push jack for the half-cut coal mining process includes a common cylinder bottom 1 and two sets of jack sets, the oil passages of the two sets of jack sets are independent of each other, and the two sets of jack sets use the shared cylinder bottom as The center extends to both ends and is arranged in a straight line, the far ends of the two sets of jack sets are connecting ears, the strokes of the two sets of jack sets are the same, and the left and right symmetrical arrangements of the two sets of jack sets are arranged.

[0026] The two sets of jack sets all include a cylinder 2, a bottom joint seat 3, a piston rod 4, a piston 5, a guide sleeve 6 and an intermediate joint seat 7, and the bottom ends of the cylinders 2 of the two sets of jack sets are respectively fixed on the common On the two end faces of the cylinder bottom 1, the guide sleeve 6 is mounted on the front end of the cylinder barrel 2, the p...

Embodiment 2

[0030] Such as image 3 with Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that two sets of jack sets share a piston rod 4, the length of the piston rod is at least twice that of Embodiment 1, and the two sets of jack sets include cylinder barrel 2, bottom Joint seat 3, piston 5, guide sleeve 6 and intermediate joint seat 7, the cylinder barrels 2 of the two sets of jack kits are respectively set on the two ends of the piston rod 4 through the guide sleeve 6, and the two ends of the piston rod 4 are respectively installed with the piston 5 , the outer end of the cylinder 2 is blocked by the cylinder bottom 13, the connecting ear 11 is arranged at the outer end of the cylinder bottom 13, and the cylinder space is divided into the cylinder bottom cavity 9 and the cylinder cavity 8 by the piston 5 , the bottom joint seat 3 is embedded on the cylinder bottom 13 and communicates with the cylinder bottom cavity 9 through the liquid hole 10, and the ...

Embodiment 3

[0033] Such as Figure 5 with Image 6As shown, the difference between this embodiment and Embodiment 1 and Embodiment 2 lies in that: the cylinder bottom piston rod assembly 14 is designed integrally, one end is a cylinder bottom 15 structure, the other end is a piston rod 16 structure, and the jack kit located on the cylinder bottom side Including cylinder 2, piston rod 4, piston 5, guide sleeve 6, bottom joint seat 3 and intermediate joint seat 7, the bottom end of the cylinder barrel 2 is fixed on the cylinder bottom 15 side of the cylinder bottom piston rod assembly 14, The guide sleeve 6 is installed on the front end of the cylinder 2, the piston 5 is installed on the tail end of the piston rod 4, and the front end of the piston rod 4 extends outwards after passing through the guide sleeve 6, and one of the connecting ears 11 Located at the far end of the piston rod 4, the piston 5 divides the cylinder space into a cylinder bottom cavity 9 and a cylinder cavity 8, and t...

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PUM

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Abstract

The invention provides a hydraulic support pushing jack for a half-well cutting coal-mining process. The hydraulic support pushing jack for the half-well cutting coal-mining process comprises a commonfoundation and two jack sets mounted on the basis of the common foundation. Oil paths of the two jack sets are independent from each other, and the two jack sets extend towards the two ends by takingthe common foundation as the center and are arranged on one straight line. The far ends of the two jack sets are connecting lugs, and the two ends of the common foundation are constitution componentsof the two jack sets correspondingly. The hydraulic support pushing jack for the half-well cutting coal-mining process achieves half-travel pushing and full-stroke support pulling from the structurallevel, and remarkably improves the control precision.

Description

technical field [0001] The invention relates to the field of coal mining jacks, in particular to a hydraulic support moving jack used in the half-cut coal mining process. Background technique [0002] The current coal mining method in coal mines is mainly automatic mining with hydraulic supports, coal shearers, and scraper conveyors. The coal shearer generally uses the conventional oblique cutting knife to cut coal. After the oblique cutting and knife feeding, the coal shearer needs to return the knife to cut the triangular coal, and then run the empty knife to the knife feeding position. The nose and the tail need to go back and forth frequently, which affects the coal mining efficiency. [0003] For thin and medium-thick coal seams with good roof and floor conditions, in recent years, the shearer has studied the method of cutting coal with a half-cut deep oblique cutting knife. After the knife feeding is completed, the normal coal cutting will be carried out directly with...

Claims

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Application Information

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IPC IPC(8): B66F3/24B66F3/25B66F3/43E21D23/18
CPCB66F3/24B66F3/25B66F3/43E21D23/18
Inventor 王永强刘付营黄莹张幸福杨文明杨元凯朱轩成刘程
Owner ZHENGZHOU COAL MINING MACHINERY GRP
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