Research On Saving Energy For The Electric Forklift Hydraulic Lifting System

With the development of economy, the global demand of forklifts has continued to increase in recent years. Electric forklift is one type of forklifts. In the current energy crisis situation, with the rapid increase of the world forklift total amounts, making energy-saving forklift study has become a new hot spot for technology development of forklift industry in China and the world. Study on energy-saving electric forklift has tremendous market values and realistic social benefits.Load potential energy is wasted when the fork of traditional electric forklift lifting system moves downwards. In this paper, the electric forklift hydraulic lifting energy-saving system is studied. The energy-saving system can retrieve and store the load potential energy during the fork moving downwards and then release it during the fork moving upwards, so as to achieve the purpose of saving energy. The energy-saving system includes an accumulator that stores and releases pressure oil which is commonly used in hydraulic system, and an energy conversion device that changes the load potential energy into oil pressure energy, in order to achieve the aim of lowering electric forklift installed motor power and energy consumption. The energy conversion device contains two piston hydraulic pump/motors and a motor, connected by a common shaft.In this paper, the working principles of the electric forklift hydraulic lifting energy-saving system paper are analyzed. Against the background of HELI CPD30 electric forklift, the design principles of the electric forklift hydraulic lifting energy-saving system are elaborated on, including the hydraulic pump/motors, accumulator and motor selection. The theoretical analysis of energy consumption and energy-saving calculation are given. The reduced installed motor power, saving energy and energy-saving efficiency of the energy-saving system are given. Using AMESim the simulation model of the electric forklift hydraulic lifting energy-saving system is successfully built and simulated. A more accurate dynamic simulation of hydraulic system is achieved. Based on the verification of the correct simulation model, further simulation study is carried out. The effects of the main hydraulic components parameters changes on energy-saving system are studied, which provides a reliable theoretical basis for reasonable choices of component parameters of the energy-saving system.The paper roundly researches the energy-saving system from both theory and simulation in detail, achieves a few valuable conclusions and results, provides theoretical basis for further research.