Research On Potential Energy Recycling System Of Telescopic Handler

Telescopic handlers are designed for special working conditions.It is combined of truck crane and forklift.Equipped with different accessories,the telescopic handler can achieve fork loading,lifting and other operations.So telescopic handler is widely used in all walks of life.Because the weight of the working device on the telescopic handler is much larger than the load and the working condition of the boom lifting and falling frequently,this causes the potential energy of the working device to be wasted in the form of heat and vibration through multi-way valve throttling.In view of the problem,this paper proposes the boom potential energy recycling system of the telescopic hander with three-chamber hydraulic cylinder.This paper mainly launches the research work from the following aspects.1.According to the working characteristics of the boom hydraulic transmission system of the telescopic hander,the energy loss of each component in the lifting and falling process is theoretically analyzed by energy flow method.Theoretical analysis shows that the total energy consumption of the system is a small part of throttling loss during boom lifting and a large part of oil throttling loss during boom lowering.Aiming at the loss of oil throttling during lowering,the energy recovery path is proposed.The boom potential energy recycling system based on three-chamber hydraulic cylinder is designed.The structure and working principle are described and the parameters of key components are determined.The energy flow method is used to analyze the total energy consumption of boom potential energy recycling system in one cycle of lifting and lowering.Combined with the analysis of the total energy consumption of the original boom system,the potential energy recycling of the working device and the comprehensive energy saving effect of the boom potential energy recycling system are theoretically obtained.2.The simulation models of the key components of the original boom system and the newly designed three-chamber hydraulic boom potential energy recycling system are constructed respectively.The mathematical modeling of the working device of telescopic handler is established by using D-H homogeneous coordinate transformation method in robotics,and the simulation model of working device is built in AMESim;The mathematical model of load sensitive pump is analyzed,and the simulation model of load sensitive pump is built by using standard components of Hydraulic library in AMESim.The pressure curve of load pressure and pump outlet pressure and the flow-pressure curve are obtained.The mathematical model of three-chamber hydraulic cylinder is analyzed,and the simulation model is built in AMESim based on the method of constructing threechamber hydraulic cylinder with double-chamber hydraulic cylinder.3.According to the simulation model of the key components,a complete simulation model of the original boom system and the boom potential energy recycling system are established.The operation characteristics of the original boom system and the boom potential energy recycling system under the same working conditions are compared and analyzed.The comprehensive analysis and comparison show that the boom potential energy recycling system proposed in this paper can fully realize the function of telescopic handler and the operation characteristics are significantly improved.The time of one cycle of boom lifting and lowering shortens by 23%;When the boom begins to lower,the speed fluctuation caused by the inertia of the working device decreases by 83.3 %,which makes the boom fall more smoothly;In the lifting process of the boom,the peak pressure decreases by about 12.5 %,and the average pressure decreases by about 23.5 %.The energy efficiency characteristics of the original boom system and the boom potential energy recycling system under the same working conditions are compared and analyzed.The comprehensive analysis and comparison show that the boom potential energy recycling system is significantly more efficient.The potential energy recovery of the working device is 139 k J,accounting for about 47.1% of the total potential energy in one cycle of the boom lifting and falling;The cumulative output energy of the boom potential energy recycling system is 92 k J less than that of the original boom system,and the comprehensive energy saving efficiency is 22.3%.4.The hydraulic accumulator is the energy storage element of boom potential energy recycling system.The influence of its parameters on energy efficiency characteristics of the system is analyzed.Under different pre-charging pressures,the energy recycling rate of potential energy increases with the increase of precharging pressure of hydraulic accumulator.Under different volume conditions,with the increase of hydraulic accumulator volume,the energy recycling rate of potential energy decreases,but the reduction is not obvious.