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  • 07 2023-03

    Zhongming CSR Report

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

  • 07 2023-03

    Zhongming Quality Integrity Report

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

  • 06 2022-10

    Type of excavator hydraulic system

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

  • 06 2022-08

    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;

  • 26 2022-03

    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......