An Research For Structure Part Strength Of Dropping Top-Coal Support On Geological Conditions Of Higher Thickness Seam And Rigid Roof

The comprehensive mining area of the dropping top-coal support of the higher-thickness seam is thicker and the mine pressure is more frequent and higher.When the dropping top-coal and the roof collapse, the impact to the roof support is so large. It is very important for the stabilization, the whole strength and reliability of the dropping top-coal support to research.This thesis analyzes the key technology of the comprehensive support design of higher-thickness seam and the parts strength affecting factors of the dropping top-coal support is studied. By analyzing the motion orbit and the bearing force of the four-bar mechanism, the mechanic model of the dropping top-coal support is set up. The parameters of the four-bar mechanism are optimized and the optimal result of the support design parameters is selected. The support inner stresses are reduced to the minimum. It provides the necessary parameters for the structural analysis and optimization of the support main structure.According to the optimization parameters and the specific dimension for matching the mining-face equipment, the three-dimension software Pro/E is used for the dropping top-coal support design. Then the simplified design model is led into the ANSYS software and the finite element analysis is finished on the worst working condition of the test requirement. By the calculation result, the main structure of the roof support is optimized and the dropping top-coal support is designed on the condition of the specific application area.Through the dropping top-coal support design of the geological conditions of higher thickness seam and rigid roof, especially the strength analysis of the support main structure, the design basis is provided for the roof support design of higher thickness seam and rigid roof.