Design and stability analysis on three-DOF double parallel hydraulic support

Since the column and the top beam of the present four-bar hydraulic support fail to bear the lateral force,the lateral force is transferred to the rod via the shield beam,which often leads to the falling down of the support or damage of the support mechanism. With regard of such a theoretical shortcoming,this article introduces a new type of double parallel hydraulic support based on the 3-RPC parallel mechanism. The working space of the hydraulic support is analyzed and the trajectory formula of the top beam is presented. Through the force analysis of the hydraulic support under the condition of partial load and large dip angle,the hydraulic support can bear the forces from three directions and an accurate mechanical relational expression is given. ADAMS is applied to do the stability simulation of the hydraulic support. The results show that the design of such a hydraulic support meets the supporting requirements of coal mines and it is feasible in technology.