In the mid-20th century, with the further development of materials science and mechanical manufacturing processes, the stage equipment chain hoist entered a crucial period of technical improvement, and its performance achieved a qualitative leap.
In terms of material innovation, new high-strength alloy steel was widely used in the manufacturing of chains and gears. This kind of alloy steel, through a special smelting process, fuses elements such as carbon, manganese, and chromium in precise proportions. It not only retains the rigidity of the metal but also improves its fatigue resistance - the load-bearing limit of the chain has increased from the previous 5 tons to more than 10 tons, and it can still maintain structural stability after repeated load-bearing, completely solving the problem that traditional cast iron chains are prone to fracture and deformation. At the same time, the gear surface is treated with carburizing and quenching, with a hardness reaching HRC58-62, and its wear resistance is more than 3 times higher than that of the previous ordinary steel, effectively extending the service life.
The optimization of the transmission system is also remarkable. Engineers redesigned the gear parameters through computer simulation technology, adopting involute tooth profile instead of the traditional cycloidal tooth profile, which increased the contact area during gear meshing by 40%, and the power transmission efficiency increased from 65% to 85%. Combined with the application of new lithium-based grease, which can maintain stable viscosity in the temperature range of -20℃ to 120℃, it not only reduces the friction coefficient between the gears of the stage equipment chain hoist but also effectively isolates the intrusion of dust. This makes the operation of the stage equipment chain hoist nearly half more labor-saving. Even female operators can easily pull 1-ton stage equipment, and there is no jamming or shaking during operation, ensuring the stability when the scenery is lifted and lowered.
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