Feeding device for underground coal mine long-distance guniting system

Abstract

The invention discloses a feeding device for an underground coal mine long-distance guniting system. The feeding device comprises a stirring bin, a material suction pipeline, a cyclone collector, a cyclone air outlet pipeline, a vacuum pump, a blocking valve, an ejector, an ejector air inlet pipeline, a long-distance material conveying pipeline and a main air source air compressor. According to the feeding device for the underground coal mine long-distance guniting system, on the basis of the current situation that the underground air source is sufficient, after guniting materials are sucked and fed into the sealed cyclone collector through negative pressure produced through the vacuum pump, the materials and gas are separated, and the guniting materials enter the blocking valve so that automatic feeding can be achieved; and the materials are conveyed in a pneumatic conveying mode, surplus gas in the guniting materials is separated out and is pumped and supplemented into a main air source by the vacuum pump, and the air source can be sufficiently utilized; the guniting materials are subjected to pumping pressure conveying through the blocking valve, continuous feeding of the guniting materials is achieved, and pipeline vibration is reduced; and accordingly, long-distance conveying is achieved, the pipeline blockage failure rate is decreased, and the investment cost of underground auxiliary conveying and early-stage auxiliary engineering is reduced.

Description

technical field [0001] The invention relates to a feeding device for a spraying system, in particular to a feeding device suitable for a long-distance spraying system in a coal mine, and belongs to the technical field of coal mine machinery equipment. Background technique [0002] The bolt-shotcrete support of coal mine roadway is a support method developed on the basis of the scientific theory of surrounding rock self-stabilization. The concrete sprayed out by the shotcrete system, the bolt and the surrounding rock together form an effective load-bearing arch. , the concrete sprayed out by the shotcrete system plays the role of support, filling, isolation and transformation in the whole support system, which can improve the stability of the roadway and the self-stabilization ability of the surrounding rock. It is the passive support of the current coal mine roadway It is a commonly used support method for active support; at present, most coal mine roadways usually use bolts...

AI Technical Summary

Problems solved by technology

[0004] In recent years, the construction technology of coal mine rock roadway engineering in China has developed rapidly. The combination of tunneling smooth blasting technology and anchor shotcrete support makes the roadway take shape at one time, and the monthly footage of inclined shaft construction can continuously reach more than 100 meters. Among them, according to the traditional spraying method, the farthest spraying distance of the spraying machine is only about 200 meters, and it is not only difficult to move the spraying machine and transport materials during construction, but also the cost is high. Due to the limitation of the field, the shotcrete machine has to be installed about 300 meters or even farther away from the shotcrete operation position, which makes it impossible for both the shotcrete machine pipeline and the underground wind pressure to meet the requirements of continuous excavation and spraying and one-time forming of the roadway. Construction requirements, so we can only wait until the roadway excavation forming and bolt support are completed before laying the rails to transport the shotcrete machine and the shotcrete materials for the spraying operation. The grouting time is greatly reduced, and the roadway support effect is greatly reduced; at the same time, the grouting machines used in the existing grouting operations usually require manual mixing and manual feeding, and the labor intensity of the operators is high, and the production efficiency is low; in addition, during long-distance pneumatic conveying, The static pressure of the spraying system is too large, and the problem of air return and material return at the inlet is serious; and in the process of tidal spraying and wet spraying, for example, mixing rice stone, fine sand and cement in a ratio of 2:2:1 The sprayed grouting material with too much water content can easily cause material deposition to block the pipeline, and the pipeline needs to be disassembled and cleaned, and the grouting work efficiency is low

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