| In response to energy and environmental issues,China has made international commitments to "carbon peak" and "carbon neutral",and put forward stronger requirements for energy conservation and emission reduction in various industries.Electric forklifts have the characteristics of cleanliness,low noise,no pollution,and easy realization of intelligent(unmanned)transformation,which makes their share of the forklift market increase day by day.Therefore,the energy-saving research on electric forklifts will have huge market value and far-reaching social benefits.This article combines the school-enterprise cooperation project "Forklift Lifting Electric Drive Energy-saving System Development" between the school and Liugong Group,taking Liugong Group CPD30 electric forklift as the research object,and in-depth study of the energy saving of the electric drive forklift lifting system The goal is to design a ball screw-type gantry lifting mechanism to simulate and test the dynamic performance and energy consumption of the forklift lifting system under the new structure.This article first analyzes the working principle of the forklift lifting system,compares the advantages and disadvantages of different transmission schemes,selects the ball screw lifting scheme,designs a coupling to connect the screw nut to the forklift inner mast,and solves the radial force of the screw nut.It is easy to cause the lead screw to jam,and finally complete the design of the ball screw lifting device.Secondly,perform finite element analysis on the main components to verify the structural strength of the designed components.Then,a permanent magnet synchronous motor vector controller is designed for the control of the forklift lifting process.Finally,a permanent magnet synchronous motor vector control model and a dynamic model of the mechanical structure of the lifting system are built,and the two are combined to complete the dynamic simulation modeling of the forklift lifting system.The simulation results show that the designed ball screw type lifting mechanism can achieve the performance indicators of the original forklift lifting system.In terms of system energy utilization,it can reach 59.33% and 73.35% under 1t,2t,and 3t loads,respectively.76.17%.A test platform for the ball screw lifting system was built.The test data showed that the energy utilization rate of the new lifting system was increased by 3.21%,9.06%,and 15.41%,respectively,compared with the original lifting system under 0.5t,1t,and 1.5t loads.It shows that the ball screw lifting system can effectively improve the energy utilization rate of the forklift,which provides a reference for the energy-saving upgrade of construction machinery and equipment. |
