3results about How to "Improve mining safety" patented technology

The utility model discloses a coal mine tunnel fault passing rapid supporting device which comprises bases distributed at the bottoms of the two sides of a tunnel, single-cylinder hydraulic props are fixedly arranged on the bases, a supporting top plate is fixedly arranged at the upper ends of the single-cylinder hydraulic props, and a supporting side plate is hinged to the end, close to the side face of the tunnel, of the supporting top plate. One end of the support top plate is hinged to the support top plate, the other end of the support top plate is hinged to an extension top plate, the other end of the extension top plate is internally connected with a butt joint plate in an inserted mode, the butt joint plate is used for butt joint to achieve closing, and a pressure monitoring mechanism is arranged on the upper surface of the support top plate. The pressure sensor collects roof pressure data in real time, and the roof pressure data is analyzed and processed by the controller to achieve real-time monitoring and early warning of the roof pressure. Meanwhile, the extension top plate is matched with the butt joint plate, the extension top plate is driven to turn over through the second hydraulic push rod, the position of the butt joint plate is adjusted through the fastening bolt, roadway top plates with different widths can be flexibly adapted, and fully-closed supporting is achieved.

This invention provides a method for calculating the critical stress of rockburst based on a weighted fusion of tension-shear composite fracture, relating to the field of rockburst prevention and control technology. The method first simplifies the stress-strain relationship of coal-rock mass into a bilinear constitutive relationship, establishing a bilinear elastic damage constitutive model of coal-rock mass and corresponding three-dimensional damage evolution equations. Then, based on a circular roadway, a dual-zone rockburst mechanical model is constructed. Next, the basic equations of the circular roadway rockburst mechanical model are constructed, further determining the deformation system equations under two ideal assumptions: tension fracture only and shear fracture only. Finally, based on the deformation system equations under these two ideal assumptions, the critical stress for rockburst is determined. This method overcomes the biases that may arise from a single fracture assumption and can more effectively predict the rockburst risk in deep coal mines.

The invention discloses an inclined thin coal seam mining device and method, and belongs to the technical field of coal mining. The inclined thin coal seam mining device comprises a vehicle body, a water cutting system and a plurality of drill rods; the vehicle body is rotatably and adjustably provided with a drill rod conveying driving mechanism; the water cutting system is connected with the tail of the first drill rod through a rotary joint; the head end of the third drill rod is connected with a drilling cutting head, and the periphery of the third drill rod is fixedly connected with a stirring falling device. The drill rod conveying driving mechanism drives a drill rod with a drill cutting head to conduct inclined upward deep drilling in the mode that second drill rods are intermittently added, the water cutting system rotates through the drill cutting head to conduct water cutting, a cutting gap in a spiral face shape is formed, and the coal seam is smashed and falls off through the stirring and falling device. Through cooperative actions of drilling, spiral path water cutting and smashing and falling, one-time hole channel mining of the inclined thin coal seam is carried out, the efficiency and safety of inclined thin coal seam mining are effectively improved, and the whole device is single, convenient to use and low in cost.