Research on the Characteristics of Energy Recovery and Reuse System for Crane Luffing System
In response to the problem of poor flow stability and high system energy consumption of the balance valve with the de-scend of crane luffing mechanism,an energy recovery and utilization system for the crane luffing system was proposed based on the hy-draulic system of pressure flow composite control in collaboration with the pump valve of the crane.An accumulator was utilized to con-tinuously increase the back pressure of the balance valve,stabilizing the pressure difference between the front and rear of the balance valve,achieving pressure compensation to make the lowering speed of the luffing mechanism more stable.At the same time,the released gravitational potential energy was recovered during the lowering of the luffing mechanism,and the accumulator was connected to the pump inlet during load lifting to achieve energy reuse.Joint simulation of the system was conducted using AMESim and Simulink soft-ware.The flow characteristics of the balance valve of the energy recovery and utilization system was analyzed through simulation results,and the energy efficiency was compared with the pressure flow composite control hydraulic system in collaboration with the pump valve.The results show that when the luffing mechanism descends,the pressure change of the accumulator in the energy recovery and utiliza-tion system of the truck crane luffing system is roughly same as the change trend of the load pressure,the pressure difference between the front and rear balance valve is more stable,and the stability of flow control is improved;at the same flow rate,the opening of the bal-ance valve port increases,and when the overcompensation function is achieved,the closing rate of the main valve port of the balance valve decreases,thereby reducing throttling loss;when lifting the load,the pressure difference between the inlet and outlet of the pump decreases,thereby reducing the output torque of the prime mover.The energy recovery and utilization rate of the crane luffing system is 17.6%,and the energy reuse rate is 86.6%,the energy recovery and utilization rate of this system is 15.2%,achieving the purpose of energy recovery and utilization.
万方数据
维普
