Dense-medium shallow-groove separating and waste-rock exhausting system used under coal mine

Abstract

The invention relates to a dense-medium shallow-groove separating and waste-rock exhausting system used under coal mine. A raw-coal belt conveyer is arranged on the feeding end side of a roller screen; a fine-cold belt conveyer arranged below the roller screen; a lump-coal belt conveyer is arranged between the discharging end of materials on the roller screen and a feeding end of a dense-medium shallow-groove separator; the dense-medium shallow-groove separator is connected with a clean-coal medium-removing scraping plate conveyor through an overflow groove; a waste-rock medium-removing scraping plate conveyor is arranged below the dense-medium shallow-groove separator; the clean-coal medium-removing scraping plate conveyor is connected with a clean-coal belt conveyer; the clean-coal beltconveyer is connected with the fine-cold belt conveyer which is arranged below the roller screen; the waste-rock medium-removing scraping plate conveyor is connected with a first waste-rock belt conveyer; the first waste-rock belt conveyer is connected with a second waste-rock belt conveyer; a qualified-medium barrel is connected with the dense-medium shallow-groove separator; and a diluted-mediumbarrel is connected with a slag slurry pump and a magnetic separator. The invention can greatly reduce the ineffective conveying volume of the waste rock in the mine, improve the producion rate, lower the operating cost and avoid causing pollution to the environment.

Description

technical field [0001] The invention relates to a gangue discharge system in the coal mining industry, in particular to a system for sorting clean coal and discharging gangue in an underground coal mining system. Background technique [0002] With the continuous improvement of large-scale mines and coal mining mechanization, especially the wide application of top-coal caving mining technology, a large number of faults in the working face or the top and bottom plates and gangue above and below the coal seam have been mixed into the coal flow line, resulting in coal mines. It can be seen that the amount of gangue has increased. In the process of coal mining, the raw coal is generally not processed underground, but directly enters the bottom coal bunker, and is lifted to the top of the well by the hoisting system before performing gangue discharge operations, and the discharged gangue needs to be stacked in a special way. site. Obviously, the transportation of gangue in the u...

AI Technical Summary

Problems solved by technology

It not only causes a waste of energy, but also the gangue sorted from the coal after going into the mine not only occupies the stacking site, but also pollutes the environment

[0003] In addition, there are currently attempts to use a dynamic sieve jig to discharge gangue underground, but the separation efficiency of the dynamic sieve is about 80-85%, and the lower limit of the separation particle size can only reach 50mm, so the scope of use is limited.

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