Research On The Hydraulic Impact Breaking And Anti-Clogging Device

For the full-mechanized mining of full height in "two-hard" coal seam, its big mining height and hard coal will cause a serious problem of coal wall caving during shearer coal mining process and often produce large pieces of coal. When the big coal of the rib fall was transported to reversed loader entrance by the scraper conveyor and can not pass, it will make transfer point congestion of the coal flow transport and block the coal flow of continuous transportation, resulting in the transport of coal from the edge of overflow tank and creating difficulties for the safe transport of underground. At this moment, it has to stop production and take manual handling to support transportation systems after coal mining machine, which often results in frequent starting of the equipment and decreasing operation rate. Thus, the breaking device installed at reversed loader entrance breaks large coals to support the transporting systems after coal mining machines, which can achieve the desired effect of a continuous crushing and compensate for the deficiencies of existing technologies. This is the need for coal mine safety production and has great practical significance.The project aimed at a special working conditions of transfer point, developed a set of hydraulic iMPact breaking and anti-clogging device. The device consists of mechanical parts and hydraulic system components. Mechanical devices using gas-liquid dynamic linkage, which structure is simple and coMPact, suitable for the characteristics of narrow space at reversed loader entrance. The paper studied the way of connecting and fixing between frame and the transport tank, Solved problems that breaking device must move with the reversed loader when working face move forward during coal mining process. The power source of the hydraulic system of the device is the emulsion pumping station in working face. The device use double speed increase circuit of back connection and accumulator to provide large instantaneous flow for Non-rod chamber of hydraulic cylinder when hammer's down, in order to improve the speed of hammer's down and to get a larger iMPact force.In order to fully understand the dynamic behavior of hydraulic system of this set when it works, In this paper, a mathematical model of two processes of hammer up and down beat were established through power bond graph method, equation of state was derived. Programming and emulating In the MATLAB / SIMULINK software, from the obtained simulation curves, we can see that the hydraulic cylinder's movement can meet the design requirements and the hydraulic system is feasible. Finally, the topic further studies on the usefulness of the device through industrial test. The results show that the device works reliably and can meet the request of breaking large coal cinder in continuous production. During the entire process of breaking large coal cinder, the various working procedure meet safety and usefulness.