FORCE TRANSMISSION ANALYSIS OF SLIDING BLOCK-TYPE HYDRAULIC SUPPORT UNDER IMPACT LOADS

In thin coal seams mining, the structure and support performances of traditional hydraulic support are strictly limited by the working environment. The new type sliding block-type hydraulic support is dedicated for thin coal seams mining. In order to comprehensively evaluate the load-bearing performance of this support, this study investigated the force state of key parts under the effect of impact loads. First, the numerical analysis model of the support was built in ADAMS software. Then, under the pressure action of the top plate, six key points on the top surface of the top beam were selected and applied with impact loads. Linear slippage pairs between sliding block and base in the model were set as different friction coefficients. Force changes at different hinge joints under various impact loads were obtained, and the influence of different friction coefficients of the sliding block on force transmission was explored. Results indicate that hinge joints are sensitive to impact loads in different degrees and thus exert dissimilar influences on the friction coefficient of the sliding block. This study is helpful for structural optimization and strength design of sliding block-type support.