The Research And Design Of A New Type Parallel Hydraulic Support

Hydraulic support has become the essential equipment in the process of underground coal mining in recent years. Its adaptability is of great significance for realizing mechanization and automation in coal mining work. The coal mining efficiency can be increased greatly, the production cost can be reduced, and meanwhile it can insure safety in coal mining with hydraulic support. Domestic hydraulic support has the defects on the principle of support structure, and this leads large internal force in the traditional hydraulic support which might cause accident occasionally.Four bar linkage hydraulic support is widely used in our country, it is composed of two parallel four bar linkages whose degree of freedom is one, therefore, the whole hydraulic support degrees of freedom comes to one, it belongs to the statically indeterminate structure which will produce large internal force. A new type of hydraulic support based on parallel mechanism is designed in this paper as it has the advantages of high bearing capacity, perfect dynamic performance and simple structure. After consulting a large number of domestic and foreign references, the analysis and research of this new type of hydraulic support have been completed in this paper.The virtual prototype model of hydraulic support in parallel has been established combined with the characteristics of6-SPS parallel mechanism instead of traditional four bar linkages. The degrees of freedom have been calculated and validated through both theoretical calculation and the ADAMS software. The limit work space of parallel hydraulic support and its influencing factors are discussed. Kinematics inverse solution and kinematics positive solution of parallel hydraulic support are simulated in ADAMS software, and theoretical check of the simulation results is done. The results show that using the ADAMS software for simulation of kinematics problem in parallel hydraulic support is feasible. The whole influence of the maximum equivalent stress caused by six pillar position has been simulated with ANSYS Workbench software, and the relevant analysis and discussion are presented in the paper.