The wire drum is the main part of the electric overhead crane lifting equipment, mainly used to wrap the wire rope. The electric single girder overhead crane usually has one hoist, so it has one wire drum, but the double girder overhead crane maybe has one or two or more wire drum, because double girder overhead crane can apply electric hoist, also can use electric trolley, or even two trolley. The reel (wire drum) has strict quality standards and scrapped standards.
Quality standards:
1. The reel length is not more than 1m, both ends center line coaxial degree is 0.015mm, length is greater than 1m, the center line coaxial degree is 0.02mm.
2. Reel ropes groove ridge, not allowed to have defect that length is more than 2% of the thread length, the depth is more than 2mm.
3. Wire rope hoist reel, If there are pores, the diameter is not more than 8mm, the depth is not more than 4mm, can not be more than 5.
4. Wire rope hoist reel groove surface roughness is 3.2, the wall thickness difference is not greater than 4mm.
Scrapped standards:
1. The reel surface appear cracks
2. The cylinder wall wear is up to 20% of the original thickness;
3. The groove can not control the rope.
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