Three-dimensional group cooperative coal caving simulation device for fully mechanized caving face and experimental method

Abstract

The invention discloses a three-dimensional group cooperative coal caving simulation device for a fully mechanized caving face and an experimental method, and the invention constructs a group cooperative coal caving device capable of simulating coal caving of different processes in a fully mechanized caving face, which controls expansion and contraction of an insert plate of a hydraulic bracket through a hydraulic system, so as to enable the opening and closing of any number of coal caving ports, and the movement of the hydraulic bracket is realized by the rotation of a screw rod. A coal caving interval spacer plate and a foam support can prevent the top coal from falling off. One scale on the coal caving interval spacer plate may represent one coal caving interval, and organic glass plates are provided around, which can record and analyze the movement law of coal gangue during coal caving. The device provides laboratory simulation conditions for researching coal caving process parameters of a group cooperative coal caving method under different geological conditions, and the invention can realize common operation of multiple coal caving ports, improve coal caving efficiency, and can allow a coal gangue interface to form an approximately inclined straight line, thus reducing the mixing of the coal gangue layer into the coal layer and improves the recovery rate and gangue content of the top coal.

Description

technical field [0001] The invention relates to a three-dimensional group cooperative coal caving simulation device and an experimental method in a fully mechanized caving face, and relates to the technical field of similar simulation experimental equipment. Background technique [0002] my country's coal resources are rich in reserves, and thick coal seams are the main coal seams for my country's pursuit of mining benefits, and their reserves account for about 45% of my country's total coal resources reserves. For most extra-thick coal seams whose thickness is greater than 8.0m, under the current production technology and equipment level conditions, the comprehensive mechanized top-coal caving mining technology is mainly used for mining. 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 are the low efficiency of ...

AI Technical Summary

Problems solved by technology

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 are the low efficiency of coal caving in the working face and the low recovery rate of top coal. The top-coal recovery time at the face accounts for more than half of the entire coal mining time at the working face, and the top-coal recovery rate is mostly about 60%. In some fully-mechanized caving faces with advanced equipment and reasonable management, the top-coal recovery rate is only about 85%.

At present, the coal discharge method of the fully mechanized caving face is to discharge coal with 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 and high coal discharge. Many problems such as low recovery rate and high mixing rate

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