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Zhongming CSR Report

Zhejiang Zhongming Construction Machinery Co., Ltd. 2022 "Made in Zhejiang" Certification Social Responsibility Report

Zhongming Quality Integrity Report

Zhejiang Zhongming Construction Machinery Co., Ltd. 2022 "Made in Zhejiang" Certification Quality Integrity Report

Type of excavator hydraulic system

​According to the characteristics of hydraulic pumps, hydraulic systems used in hydraulic excavators generally include quantitative system, variable system and quantitative and variable system.

The role of the piston rod

(1) to have enough strength, stiffness and stability;(2) Good wear resistance and high machining accuracy and surface roughness requirements;

Cause of overheating of piston rod

(1) when the piston rod and stuffing box assembly is skewed, causing local friction, should be adjusted in time;(2) the sealing ring holding spring is too tight, the friction force is large, should be......

Donation from Charity Federation of Zhejiang Zhongming Construction Machinery Co., Ltd

From January 1, 2021 to July 31, 2021, Longquan Charity Federation received a total of 1706560.18 yuan of donations. Thank all sectors of society, caring enterprises and caring people for their trust ......