A Coal Caving Method with Multiple Coal Caving Ports in Fully Mechanized Caving Faces

Abstract

The invention discloses a cooperative coal caving method for a plurality of coal caving openings of a fully mechanized top-coal caving face. The cooperative coal caving method comprises the followingsteps: 1) initial coal caving: carrying out the coal caving on the first and nth coal caving openings on an approximate inclined straight line coal-rock interface; when starting the initial coal caving, opening the first and nth coal caving openings at the same time to carry out the coal carving; then closing each coal caving opening inversely at certain time interval according to a principle of closing a door when meeting coal gangues; 2) middle coal carving: when the first coal caving opening meets the coal gangues, opening the (n+1)th coal caving opening; when the second coal caving openingmeets the coal gangues, opening the (n+2)th coal caving opening and so on; when the (N-n)th coal caving opening meets the coal gangues, opening the Nth coal caving opening; keeping continuous coal caving of the n coal caving openings at the same time all the time; 3) tail-end coal caving: closing the coal caving opening when the (N-n+1)th coal caving opening meets the coal gangues according to the principle of closing the door when meeting coal gangues until the Nth coal caving opening is closed; then finishing a tail-end coal caving process. By adopting the cooperative coal caving method, the coal caving efficiency and top coal recycling rate of the fully mechanized top-coal caving face can be improved.

Description

technical field [0001] The invention belongs to the technical field of coal caving in a fully mechanized caving face, and in particular relates to a coordinated coal caving method with multiple coal caving ports in a fully mechanized caving face. Background technique [0002] After more than 30 years of development in my country, fully mechanized caving mining technology has achieved remarkable technical results, but there are still some problems. The most prominent production problems faced by fully mechanized caving mining are the low efficiency of coal caving in the working face and the recovery of top coal. The recovery rate is low. At present, the top-coal recovery time of fully-mechanized caving faces accounts for more than half of the entire coal mining time of the working face. %about. [0003] In the coal caving process of the fully mechanized caving face, the selection of coal caving method parameters plays an important role in the coal caving efficiency and the top...

AI Technical Summary

Problems solved by technology

When coal is discharged from a single coal discharge port (or multiple discontinuous coal discharge ports), due to the limited area of ​​the coal discharge port, the top coal caving is not smooth, resulting in low coal discharge efficiency, low top coal recovery rate, and mixed gangue rate. many more questions

In the coal caving process of the fully mechanized caving face, another factor that has a greater impact on the recovery rate of the top coal and the mixed gangue rate is the identification of coal and gangue. It is determined that multiple continuous coal discharge ports cannot be opened for coal discharge at one time. If multiple continuous coal discharge ports are opened for coal discharge at one time, the coal dust of each coal discharge port will superimpose and affect each other, reducing the visibility behind the coal discharge hydraulic support, making the discharge Coal workers cannot clearly see the coal and gangue discharge situation behind the coal discharge support, and cannot judge the coal discharge situation at the coal discharge port. Therefore, at present, a single coal discharge port (or discontinuous multiple discharge ports) coal port)

Images