On March 21, the China Construction Machinery Association (hereinafter referred to as the Association) organized a scientific and technological achievement appraisal meeting in Liuzhou, Guangxi, for six scientific and technological achievements of Guangxi Liugong Machinery Co., Ltd.

Industry experts from the Association, China Academy of Machinery Science and Technology Group Co., Ltd., Tongji University, Chang'an University, Guangxi University, Beijing Institute of Technology, Guilin University of Electronic Technology and other institutions attended this appraisal meeting.

01 Research and Application of Key Energy-Saving Technologies for Fully Electronically Controlled Hydraulic Excavators. Technical optimization was achieved in aspects such as the electronic control system, hydraulic system, engine system and structural components, achieving energy-saving effects.

02 Research and Application of Key Safety Technologies for Excavators in Special Environments. Through comparative research on the gap between domestic excavators and internationally first-class brands under high-risk working conditions, innovative development of active safety protection mechanisms and control systems for excavators under high-risk working conditions was completed, achieving industrial application.

03 Key Technologies and Industrial Application of Defoaming and Energy Saving for Hydraulic Media in Construction Machinery. Systematic control of bubbles in the medium was carried out from the principle level of bubble generation to the method level of bubble elimination, ensuring lower oil temperature and higher efficiency of the hydraulic system and achieving better energy saving for the whole machine.

04 Pure Electric High-Torque Motor Direct-Drive Mining Dump Truck. It is composed of a drive system, hydraulic system, transmission system, control system, suspension system and braking system, and features efficient transportation, energy saving and environmental protection, intelligent control and safety performance. It adopts a connection between the transmission shaft and the drive axle without a transmission transition, achieving continuously variable speed, no power interruption and improved transmission efficiency of the whole vehicle.

05 Development and Application of Intelligent Unmanned Construction Hoists. Adapting to the state of no dedicated operator on the construction site, it achieves automatic opening and closing of the cage door/guardrail door/landing door and automatic operation and stopping of the hoist, eliminating manual operation, improving efficiency and reducing construction costs.

06 Key Technology Research and Industrialization of Hydrostatic Intelligent Bulldozers. The control systems of the whole machine's working device, vehicle travel, heat dissipation and engine are developed toward intelligence through mechanical means or simple mechanical-hydraulic control toward mechanical, electrical and hydraulic hybrid control, remote remote-control and communication control.

The experts inspected the products, listened to the reports of the completing units, reviewed the relevant technical materials, and after questioning and discussion, the appraisal committee considered that the six project achievements are highly innovative, technically difficult and have independent intellectual property rights. The overall technologies have respectively reached the international advanced level and the domestic leading level, with some technologies reaching the international leading level.