Initial coal drawing method of fully mechanized caving face multi-coal drawing openings

Abstract

The invention discloses an initial coal drawing method of fully mechanized caving face multi-coal drawing openings. The initial coal drawing method of the fully mechanized caving face multi-coal drawing openings comprises the steps that initial coal drawing is the coal drawing process of the first coal drawing opening to the n coal drawing opening; coal drawing is carried out on the first coaldrawing opening to the n coal drawing opening by a coal petrography interface approximating an inclined straight line; and when initial coal drawing starts, the first coal drawing opening to then coal drawing opening are opened simultaneously for coal drawing, then, the n coal drawing opening is closed to the second coal drawing opening at time intervals in a inverse mode, after thefirst coal drawing opening reaches the preset time interval, the second coal drawing opening to the n coal drawing opening are opened simultaneously, so that coal drawing is carried out on the first coal drawing opening to the n coal drawing opening simultaneously, according to a principle of coal drawing when meeting gangue, the n coal drawing openings are sequentially closed, and at themoment, initial coal drawing is completed. The initial coal drawing method of the fully mechanized caving face multi-coal drawing openings can improve the coal drawing efficiency and top coal recoveryof a fully mechanized caving face.

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 an initial 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 co...

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 discharge) and the initial coal discharge is the most critical part in the whole coal discharge process with multiple coal discharge ports

Images