Optimization Calculation And Simulation Study On Hydraulic System And Excavating Equipment Of Mine Loader

Mine loader is mainly used in the narrow mine for scraping and loading. Mine loaderwhich uses electric hydraulic system, combines the scraping and transporting function. Thearticle makes optimization and improvement for the “ZLD/T70FA Mine Loader” which isresearched and developed by a domestic company. The paper mainly studies the hydraulicsystem and excavating equipment. It aims to guide the further improvement of “ZLD/T70FAMine Loader” according to the theoretical study and simulation analysis, so as to make itmore adaptable to the adverse working environment, and improve its performance.The paper simply analyses the machine structure and excavating equipment of mineloader on the basis of the research status at home and abroad. Then make detailed survey ofthe “ZLD/T70FA Mine Loader”, come to conclusion that the hydraulic system and excavatingequipment have problems. For example there is collision between the scraping bucket and therear arm. These problems provide the basis for kinematics, dynamics and co-simulation study.In order to solve the problems, the paper does the following works. Firstly, establish the3D solid model in the SolidWorks, then put it into ADAMS to make kinematics simulationand draw the excavating trajectory envelope. Analyze the simulation results to find that thereis interference between the excavating trajectory envelope and the rear arm. Secondly, makedynamics simulation, and find that the stress of the joint between the rear arm and revolvingbody and the rear arm hydraulic cylinder changes greatly. Lastly, establish the hydraulicsystem model in AMESim, and co-simulation with ADAMS to analyze the mine loader.Simulation results reveal that the movement of two slewing hydraulic cylinder is notsynchronous, the speed of the rear arm hydraulic cylinder exists the certainly fluctuation, theefficiency of forearm mining is low. The problems which the simulation results reveal verifythe survey results.The paper makes calculation and analysis, then put forward the improvement schemes inview of the “ZLD/T70FA Mine Loader”.Those improvement schemes are as follows. Thehydraulic cylinders are standardized to solve the collision of the scraping bucket and the reararm. Design the serial synchronous circuit to solve the problem that the two slewing hydraulic cylinders’ displacement isn’t synchronous. And design the speed limit loop to reduce therotary speed and the rotary impact, thereby improve the system stability. Design thedifferential loop to solve the problem that forearm mining efficiency is low. Design a newbuffering hydraulic cylinder to solve the impact problem of forearm cylinder. Makecalculation and selection of double pump, motor, relief valve, hydraulic pipe and radiator. Andcarry out the heat balance calculation of hydraulic system, solve the problem of heat andenergy waste, improve the performance of the hydraulic system.In conclusion, make the kinematics, dynamics and co-simulations of the optimized mineloader, compare the simulation results with original simulation results, verify the effect ofimprovement schemes. After optimization, the overall performance is improved, avoiding themechanical collision, the hydraulic impact is greatly reduced, the operation is more flexibleand portable, the heat quantity of hydraulic system is reduced, the productivity is improved.The optimization calculation and simulation study on hydraulic system and excavatingequipment of mine loader provides theoretical guidance for a new type mine loader designing.The research has both theoretical significance and practical value.