The shell design of the hand chain hoist for outdoor stages can be called a perfect combination of functionality and durability. In terms of adaptability to humid environments, this shell material has passed strict neutral salt spray tests: after 48 hours of continuous spraying with a 5% sodium chloride solution, the surface rust area is less than 0.1%, and there is no obvious spread of rust stains. Even near indoor fountain landscapes (where the air humidity is long-term at 85%-90% and the water contains 0.01% chloride ions) or in outdoor short-term heavy rainfall scenarios (with precipitation reaching 5mm per hour and rainwater pH value ranging from 6.5 to 7.5), the shell of the hand chain hoist for outdoor stages can still maintain its metallic luster. More importantly, the mating surface between the shell and the internal gearbox adopts precision grinding technology, with the roughness controlled within Ra0.8μm. Even in high-humidity environments, the fit clearance between components remains stable in the range of 0.05-0.1mm, completely avoiding jamming caused by rust. In the simulated operation test in an 85% humidity environment for 30 consecutive days, the resistance fluctuation value of the lifting action of the hand chain hoist for outdoor stages does not exceed 5N, ensuring that operators can always maintain a smooth operating feel.
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