Research On Potential Energy Recovevery And Reuse System Of Electric Forklift

The logistics industry is a complex industry integrating transportation,warehousing and information,and it is one of the most promising industries in the 21st century.As an important equipment for logistics loading,unloading,stacking and short-distance transportation,the electric forklift is becoming more and more important in the field of logistics and warehousing,with its outstanding advantages such as high efficiency,no pollution,low noise and easy operation.However,the electric forklift lifting system frequently moves up and down,causing a large amount of load gravitational potential energy to be converted into hydraulic system heat energy.This not only wastes energy seriously,but also restricts the single-class battery life of the electric forklift,hindering its further popularization and development,so it is urgent to carry out research on potential energy recovery of the electric forklift.Aiming at this serious problem of potential energy loss in electric forklift lifting system,this paper designs a potential energy recovery and reuse system,and proposes a dual energy distribution strategy,and builds a test prototype.The main research work and results are summarized as follows:1)The working principle and working condition characteristics of the electric forklift lifting system are analyzed.The main working parameters about the design of the potential energy recovery system are studied,including the falling speed control and the falling time of the lifting system.Based on the measured data of the whole vehicle,the power output of the electric forklift battery during operation is analyzed,and the comparison analysis of the output current of the battery under different load weights is given.The working principle and working condition characteristics of various energy storage devices are studied,and the scheme of potential energy recovery and reuse system for the electric forklift is designed.2)The mathematical model of key components in the potential energy recovery and reuse system of electric forklift is established,and the parameter relationship of these components is given.Based on the potential energy recovery and reuse scheme designed in this paper,the simulation of the potential energy recovery and reuse system is carried out and analyzed by Amesim.The simulation results are consistent with the theoretical analysis.The scheme designed in this paper can effectively recover the potential energy of the load and complete the reuse of the recovered energy.3)The type selection of the key components such as hydraulic motor,generator and supercapacitor is completed.For the potential energy recovery and reuse control system,the control module,voltage/current signal sampling circuit,charging circuit and DC/DC converter are designed.A potential energy recovery and reuse system control strategy is developed,and a supercapacitor and battery energy distribution method is proposed.4)The transformation of the electric forklift lifting system is completed,and a real vehicle test prototype with potential energy recovery and reuse syterm is built,tests under different test conditions are carried out.In the potential energy recovery test,the influencing factors of potential energy recovery efficiency are obtained.In the potential energy reuse test,the reuse effect of recovery potential energy in supercapacitor is compared based on different test parameters.The test results show that the potential energy recovery and reuse system can effectively recover the load gravitational potential energy.When the load of the forklift truck is 1 t,the potential energy recovery efficiency is above 30%;and by recycling the recovered potential energy,the output current peak of the traditional forklift battery is reduced by 10%-20%,reducing the pulse of output current of battery,and effectively protecting the battery life.