Recovery method for mine coalside anchor pole

Abstract

The invention discloses a recovery method for a mine coalside anchor rod. The recovery method comprises the following steps of orderly detaching and recovering coalside supporting components such as a coalside resin metal anchor rod tray, a nut, a ladder beam and a net, and then extracting the coalside resin metal anchor rod out by a wet coalside resin metal anchor rod recovery drilling tool. Three-toothed diamond compacts are welded to a coring drill bit of the wet coalside resin metal anchor rod recovery drilling tool, so problems of small cutting output, slow propelling speed, poor rock-refuse breaking effect, inadequate power and great demand for labors of a common alloy sheet coring drill bit can be solved; with proper inner diameter, wall thickness, numbers and length of the coring drill bit, problems of irrational coring drilling rod inner diameter design, coalside anchor rod interference, coalside resin metal anchor rod break due to extraction and multi-stage coring drilling rod use can be solved; and the recovery method for a mine coalside anchor rod is advantaged by safe operation, fast propelling speed, great rock-refuse breaking effect and high recovery utilization rate.

Description

technical field [0001] The invention belongs to the technical category of coal seam roadway coal side support in coal measure strata mines, and in particular relates to a method for recovering a resin metal anchor rod from the coal seam roadway coal side. Background technique [0002] In the coal side support of mine coal seam roadway in coal measure strata, the commonly used coal side anchors are glass fiber reinforced plastic anchors, recyclable metal anchors and resin metal anchors. Among them, the disadvantages of glass fiber reinforced plastic anchors and recyclable metal anchors are small torque and pallet bearing capacity, and resin metal anchors are mainly used as coal side anchors. When the resin-metal bolts are used to support the coal side of the fully mechanized mining face, they need to be recovered during the mining process. The existing recovery methods are mainly: [0003] (1) When the shearer cuts the coal to the end and the mine pressure appears, manually ...

AI Technical Summary

Problems solved by technology

[0003] (1) When the shearer cuts the coal to the end and the mine pressure appears, manually pull out the coal side resin metal anchor rod directly; when the mine pressure does not appear, directly cut the coal side resin metal anchor rod and convey Machine picks out the residue of resin metal bolts manually, this kind of method operation has great potential safety hazards

[0004] (2) Use the coal side bolt recovery method to directly pull out the coal side bolt to realize the recovery of the coal side resin metal bolt. For example: patent (CN 104653205 A) discloses a coal side resin metal in fully mechanized mining face A bolt recovery method, the method is to connect one end of the lifting ring with the resin metal anchor rod of the coal bank, the other end is connected with the pull rope, and the other end of the pull rope is connected with the telescopic oil cylinder of the shearer. When the coal side resin metal anchor is within 1m range, the telescopic oil cylinder drives the pull rope to directly pull out the coal side resin metal anchor within the range, realizing the recovery of the coal side resin metal anchor; patent (CN 203214078U, CN 202520340 U, ​​CN 2184784 Y) etc. all disclose a kind of bolt recovering device, take electric motor or hydraulic pump as power source, adopt fixture to clamp the exposed part of coal side resin metal bolt, pull out coal side resin metal bolt directly, realize coal side resin Metal bolt recovery, the disadvantages of this type of method are: on the one hand, due to the effect of the anchoring force of the resin metal bolt and the mine pressure of the coal side roadway, the power required to directly pull out the coal side resin metal bolt is relatively large; On the one hand, the scrap rate of the pulled out coal side resin metal anchor is high, the yield strength is not up to the standard, and the recycling rate is low

Combined with the current situation of coal side resin metal bolt support, in the patent of the wet coal side bolt recovery device disclosed now, its disadvantages are: the cutting amount of the ordinary alloy sheet hollow core drill bit is small, and the advancing speed is slow. When the coal side is gangue In the actual use process, it was found that the gangue breaking effect was poor, and the power was insufficient, requiring three people to work; in the wet coal side bolt recovery device disclosed in some patents, the hollow core drill pipe is still a tubular auger drill pipe, and the discharge from the coal According to the final angle analysis, the helical hollow drill pipe is not very operable; the eccentric distance of the inner diameter of the hollow drill pipe is unreasonable, which interferes with the coal seam bolt, and the phenomenon of directly breaking the coal seam bolt occurs from time to time; The length is 1800-2000mm, and the multi-stage drill pipe used for the hollow core drill pipe does not match the coal side support; the connector is a quick-installation device, and the sealing ring connected between the drill rig and the connector has poor durability and a high damage rate

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