Mine remaining anchor rod unscrewing device and method

Abstract

The invention discloses a mine remaining anchor rod unscrewing device and method. The mine remaining anchor rod unscrewing device comprises a threading cylinder and a limiting cylinder, the limiting cylinder sleeves one end, close to a remaining anchor rod, of the threading cylinder, and the threading cylinder can move in the axial direction relative to the limiting cylinder; a threading die is arranged in the end, close to the remaining anchor rod, of the threading cylinder and fixed through a fastening nut, a threading die tool bit is arranged in the threading die, and a sleeve tail connector used for being connected with a hydraulic anchor rod drilling machine is arranged at the other end of the threading cylinder; and the end, close to the remaining anchor rod, of the limiting cylinder is connected with a hydraulic rod. According to the unscrewing device and method, underground operation can be greatly facilitated, and the transformation speed of the remaining anchor rod is increased. Original underground equipment can be fully utilized, an original underground hydraulic jumbolter is combined with the threading cylinder, convenience and rapidness are achieved, the cost is low, and the realizability is high.

Description

technical field [0001] The invention belongs to the technical field of bolt support, and in particular relates to a device and method for opening wires of bolts left in coal pillars of gob-side entry. Background technique [0002] Under the coal mine, when the roadway is excavated along the goaf, the narrow coal pillars will be supported by bolts to increase the support strength of the coal pillars. After the adjacent coal mining face is mined, the mined-out area will be formed in the mining area. The coal mining face will be a distance away from the goaf, and the mining roadway of the working face will be excavated along the goaf, and a coal pillar will be left at this time. The bolts in the mining roadway of the adjacent coal mining face will still remain in the coal pillar. When the coal mining face excavates the recovery roadway, if the coal pillar is narrow, the anchor rod left in the coal pillar may be exposed. Now it is necessary to carry out operations such as cut...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many thread opening devices in the market, but due to the special underground environment and high gas, the electric threading machine needs to be installed with explosion-proof devices, and the cost is relatively high

Moreover, the existing electric threading machine realizes the function of threading by fixing the die and rotating the anchor rod, but when the leftover anchor rod is reused, the anchor rod is fixed in the coal pillar and cannot be rotated, which cannot be well matched with the existing electric threading machine use, the threading function of legacy anchors cannot be realized

If a manual threading device is used, the number of downhole bolts is large, the efficiency is low, and the function of threading cannot be well realized

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