Pulling device and method for pin shaft of hydraulic support

Abstract

The invention relates to a pulling-out device of a hydraulic support pin shaft and a pin pulling method of the pulling-out device. The device comprises a liquid-state carbon dioxide gasification expander and is characterized in that the liquid-state carbon dioxide gasification expander is connected with a pin pulling machine through an end head and a connector, and the pin pulling machine is mainly formed by a piston in a cylinder body, the connector on the cylinder body and a plurality of fixed seats on the cylinder body. The liquid-state carbon dioxide gasification expander is connected with the pin pulling machine through the end head and the connector, the structure is simple, operation is convenient, and the pin pulling method is a non-explosive-demolition method which is used for pulling out the hydraulic support pin shaft through a gas impact piston and does not generate sparks; the method is safe, convenient and rapid; the pulled pin shaft is prevented from deforming, cracking and bending; and compared with a chain block method, the support breaking-down speed is high, no potential safety hazards exist, and the efficiency is high.

Description

technical field [0001] The invention relates to a device and method for withdrawing a pin shaft of a hydraulic support, in particular to a device and a method for extracting a pin shaft of a hydraulic support. Background technique [0002] The retraction speed of the hydraulic support supported by the fully mechanized mining face is directly related to the safety production and economic benefits of the coal mine. One of the keys to determine the retraction speed is the speed of decomposing the hydraulic support. The speed of decomposing the hydraulic support depends on the pulling out of the hydraulic support pin shaft. out of time. Especially in the case of fully mechanized mining face with large period of compression, short spontaneous combustion period, and rapid deformation of surrounding rock, the problem is particularly important. [0003] The hydraulic support has been used underground for a long time. Under the harsh environment and heavy load operation in the under...

AI Technical Summary

Problems solved by technology

[0003] The hydraulic support has been used underground for a long time. Under the harsh environment and heavy load operation in the underground, it is prone to rust, some of which are severely corroded, and groove steps appear in severe wear. It is difficult to disassemble, and there is deformation and bending under pressure. Can't get out of shape

[0004] In the past, the methods used to decompose the hydraulic support and withdraw the pin include: paste gun method, paste explosives on the surface of the pin shaft, and evacuate the personnel to detonate. This method has a short operation time and simple process, but there are major safety hazards, such as easy to cause coal dust Explosion, damage to pins and other parts, such as deformation, cracking, bending, etc., increase the difficulty of secondary pin removal, aggravate construction difficulties, and waste time; chain hoist method: when the working space is relatively large, use manual The chain hoist crane pulls out the connecting pin of the bracket; and when the working space is narrow, the chain hoist crane is used manually to pull out one side of the bracket connection, and the other side uses an iron rod to knock out the connecting pin

This method is slow to decompose the support, has many safety hazards, and low efficiency. Each small class of 8 people can decompose 3 groups at most. At the same time, the lifting device is used repeatedly to adjust the height of the support, and the winch pulls the front and rear positions of the support so that the crane can pull out the pin.

It is difficult to grasp the position of the bracket during the pin pulling process, and it takes a long time; there are unsafe factors such as the steel wire rope bouncing, the crane chain breaking, etc.

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