Second-hand lifting equipment refers to special-purpose machinery that has been put into actual use in engineering projects, factories, ports, and other settings. After undergoing professional inspection, repair, maintenance, or complete refurbishment, it still retains the ability to operate safely, perform vertical lifting of heavy loads, horizontal transportation, and precise positioning. It is widely used in construction, equipment installation, logistics handling, mining infrastructure development, steel structure hoisting, and other fields.
I. From a technical perspective
Lifting equipment uses electric motors, diesel engines, or hydraulic power units as power sources. It operates through the coordinated action of four core systems: the winding mechanism, luffing mechanism, slewing mechanism, and traveling mechanism. Power is transmitted via reducers and brakes to the drum or hydraulic cylinder, driving wire ropes and chains to lift and change the amplitude of heavy loads. The slewing bearing, in conjunction with the hydraulic motor, enables 360° operational coverage. The traveling system (tires, tracks, or rails) facilitates site relocation. The entire machine is equipped with safety control units such as torque limiters, height limiters, weight sensors, and emergency brakes. Through hydraulic transmission and electronic overload protection, it achieves smooth and safe lifting operations, preventing overloading, tipping, and impact during operation.
II. In terms of performance data and operating standards
Qualified second-hand lifting equipment must meet the following requirements: the rated lifting capacity ranges from 0.5 tons to 500 tons, the lifting height can reach several tens of meters, and key parameters such as slewing speed, luffing time, and traveling speed comply with the original manufacturer’s design standards. After refurbishment, the engine or motor output power recovers to 85%–95% of its nominal value, the hydraulic system pressure remains stable with no abnormal leakage, and structural components (such as the boom, frame, and outriggers) show no cracks or permanent deformation. Safety devices are complete and effective, and load tests, braking distance tests, and static stiffness tests all meet the standards. The equipment can directly pass site safety inspections and meet the requirements for using special equipment. Its operational efficiency and durability are close to those of new machines, providing long-term stable construction capability.
