In the process of using the electric hoist, it is often the case that the wire rope is pulled out of the cavity of the drum into the cavity on both sides of the drum. After this happens, it takes a few hours to draw the wire rope, and this situation will occur repeatedly. After many analyses, it was found that the gap between the drum and the drum casing was too large. To this end, we take the method of repairing the steel ring 4 (see figure) on both sides of the drum to keep the unilateral clearance at
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