Analysis of Mechanical-Hydraulic Cooperative Response of Hydraulic Support Under Roof Rotary Impact

Abstract

Hydraulic support is a collaborative bearing equipment with hydraulic transmission power and mechanical bearing load. The method of the mechanical-hydraulic co-simulation model is used to discuss the response difference of hydraulic support in the process of roof rotation. Based on this model, the variation law of hydraulic support is analyzed by changing the rotation velocities of the roof. Then, by changing the discharge flow of relief valves at the column, the energy unloading characteristics of the column are discussed. The results demonstrate that with an increase in the roof rotary velocity, the pressure and flow peaks of the column increase continuously (the increase multiples of pressure and flow peaks are 123% and 51%, respectively). The tendency of load variation at different locations of hinge points appears to be varied. Lastly, this paper increases the discharge flow of the relief valve to shorten the energy unloading time (by 1.5 s) and reduce the load at the hinge point. This approach helps reduce the probability of damage to the hydraulic support and prolongs its life.

Keywords

• Hydraulic drives
• mechanical engineering
• valves