Energy-saving hydraulic system of electric forklift

Abstract

The invention relates to an energy-saving hydraulic system of an electric forklift. The system comprises a one-way valve, a motor, a multi-way valve and the like, wherein the multi-way valve is a plate valve and comprises an oil inlet/return valve sheet, a lifting reversing valve sheet, a middle connection valve sheet, an oblique reversing valve sheet and an oil inlet valve sheet; the one-way valve and a main safety valve are arranged in the oil inlet/return valve sheet which is externally connected with an oil port P1 and an oil return port T1; the lifting reversing valve sheet is a three-position six-way reversing valve sheet, a middle-position channel, a right-position oil channel and a left-position oil channel are arranged in the lifting reversing valve sheet, and the lifting reversing valve sheet is externally connected with oil ports A1, Pt and T2; the middle connection valve sheet is a transitional connection valve sheet, and a three-way pipe is arranged in the middle connection valve sheet; the oblique reversing valve sheet is a three-position six-way reversing valve sheet, a middle-position oil channel is arranged in the oblique reversing valve sheet, and the oblique reversing valve sheet is externally connected with oil ports A2 and B2; and an oblique overflow valve, a reversing overflow valve and a priority valve are arranged in the oil inlet valve sheet, and the oil inlet valve sheet is externally connected with oil ports P2, CF and Ls. Through the invention, after the electric forklift is charged once, the recovery efficiency of potential energy can reach 59.7%, the total recovery efficiency of the system can reach 31.3%, and the working time of the electric forklift can be prolonged by 1/5.

Description

technical field [0001] The invention belongs to the technical field of electric forklifts, and in particular relates to a hydraulic system of an electric forklift. Background technique [0002] The forklift uses the lifting system to complete the processes of picking up, lifting, and stacking the goods. When the forklift picks up the goods and descends, the throttle valve is used to control the descending speed of the lifting system. Ordinary forklifts usually do not have an energy recovery device. Most of the potential energy released during the lifting system's descent is consumed on the throttle valve, and the potential energy is converted into heat energy in the hydraulic system, resulting in a rise in oil temperature, which affects the reliability of hydraulic components and the entire vehicle. work efficiency. In addition, the common hydraulic steering system of forklifts adopts a constant-flow shunt system, which consumes a lot of power and has high hydraulic oil te...

AI Technical Summary

Problems solved by technology

Ordinary forklifts usually do not have an energy recovery device. Most of the potential energy released during the lifting system's descent is consumed on the throttle valve, and the potential energy is converted into heat energy in the hydraulic system, resulting in a rise in oil temperature, which affects the reliability of hydraulic components and the entire vehicle. work efficiency

In addi

Images