Dust falling device for mine downhole fully-mechanized coal mining face shifting frame falling coal fog gun

Abstract

The invention discloses a dust falling device for a mine downhole fully-mechanized coal mining face shifting frame falling coal fog gun. The dust falling device includes a negative-pressure generator,an atomizing mechanism and a dust suction tube, the negative-pressure generator is fixed to the upper end of a gangue sliding groove, the gun muzzle end of the negative-pressure generator directly faces the coal wall, an airflow expansion cavity is formed in the side wall of the negative-pressure generator, an air inlet is formed in the corresponding outer side wall of the air flow expansion cavity, an annular nozzle is arranged on the corresponding inner wall, a dust suction mouth is formed in the side wall of the end, away from the gun muzzle, of the negative-pressure generator to be connected with the dust suction tube, the free end of the dust suction tube is located in the gangue sliding groove, and compressed air is ejected from the annular nozzle and forms a negative -pressure cavity in the rear end to suck dust in the gangue sliding groove; and the atomizing mechanism includes a high-pressure water pipe extending into the negative-pressure generator, an atomizing spraying headinstalled at the end of the high-pressure water pipe and a diffusion plate located on the front part of the atomizing spraying head, atomized water ejected by the atomizing spraying head touches thediffusion plate and then bounces and diffuses and is mixed with sucked dust to form dust-containing water mists to eject to the gun muzzle, and high-efficiency dust falling is achieved.

Description

technical field [0001] The invention relates to the field of coal and dust control in fully mechanized mining working faces, in particular to a coal mist cannon and dust suppressing device for fully mechanized mining working faces in underground mines. Background technique [0002] During the operation of the fully mechanized mining face in the mine, it is necessary to move the fully mechanized mining hydraulic support forward every once in a while, and during the movement of the hydraulic support, it falls from the rear sides of the top beam of the hydraulic support and the two sides of the cover beam. Many coal gangue and powder, among which the heavier coal gangue blocks will fall directly due to gravity, and the dust will diffuse and float under the action of wind flow because of its lightness, which greatly affects the physical and mental health of the workers. [0003] The most common way to solve this problem is to use spraying method to reduce dust, and install high-...

AI Technical Summary

Problems solved by technology

[0002] During the operation of the fully mechanized mining face in the mine, it is necessary to move the fully mechanized mining hydraulic support forward every once in a while, and during the movement of the hydraulic support, it falls from the rear sides of the top beam of the hydraulic support and the two sides of the cover beam. Many coal gangue and powder, among which the heavier gangue block will fall directly due to gravity, while the dust will diffuse and float under the action of wind flow because of its lightness, which greatly affects the physical and mental health of the workers

[0003] The most common way to solve this problem is to use spraying method to reduce dust, and install high-pressure water to spray at the dust falling position to make the floating dust settle. However, in actual use, this method is limited by the space of the bracket and the amount of coal dropped when the bracket moves. It is too large to be sprayed in a large area. At the same time, the atomized particles cannot be fully mixed with the dust in time to meet the requirements of dust reduction. Moreover, the water mist spray will pollute the environment of the sidewalk below, which will affect the operation of the operators.

[0004] In addition, an anti-leakage device is installed on the side of the hydraulic support on the fully mechanized mining face. The falling coal gangue falls backward along the gangue chute into the gap behind the bottom of the support. This structural design works well for mines with small fully-mechanized mining heights, but for fully-mechanized mining faces with large mining heights, Its overall height reaches more than five meters, so the height of the lower end of the gangue chute from the base can reach more than three meters, and even some super-large fully mechanized mining faces with a mining height of more than 8 meters have a height of more than five meters at the bottom of the gangue chute , which makes the coal gangue and dust falling by its own weight appear dusty again, and the raised dust drifts to the sidewalk with the wind flow on the working face, causing serious pollution to the working environment and endangering the health of workers

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