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Hydraulic auto scale system of high order-picking Forklift and its application

Published:2022-02-23 author:WANG Ban, WANG Xin-jie, YE Guo-yun, et al. Browse: 876 Check PDF documents

Hydraulic auto scale system of high order-picking forklift and its application

WANG Ban1,2,3, WANG Xin-jie1, YE Guo-yun2, FU Min2

(1.School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;2.Ningbo Ruyi Joint Stock

Co., Ltd., Ningbo 315600, China;3.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract: Aiming at the problem of load scale and safe operation of the high orderpicking truck, an auto scale method based on hydraulic circuit pressure measurement was proposed and applied to safe operation of the forklift truck. According to the working principle of the forklift system, the advantages and disadvantages of several scale methods were analyzed comparatively. The mathematical relationship between pressure of the lifting hydraulic cylinder and the cargo weight was obtained by theoretical analysis of the system dynamic model in the process of cargo lifting. The hardware composition of the forklift scale system including the sensor, the main controller, the display and the communication link was provided. The least square method was utilized to obtain the pressure-weight curve by function fitting. The safe operation of the forklift truck was researched by combining the scale technology with the height measurement technology of the forklift system through the wire draw encoder. The scale test results show that the scale error limit of the forklift scale system under the high load condition based on the pressure measurement of the lifting hydraulic cylinder is≤3%. The load auto scale and safe operation of the order-picking truck are realized autonomously at the same time.

Key words: high order-picking forklift; pressure measurement; auto scale technology;the least square method; safe operation

WANG Ban, WANG Xin-jie, YE Guo-yun, et al. Hydraulic auto scale system of high order-picking Forklift and its application［J］.Journal of Mechanical & Electrical Engineering, 2021,38(12):1636-1640,1646.

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