Crane pulley set by a number of dynamic pulley, fixed pulley assembled from a simple machine, both to save force can also change the direction of force. Pulley set of the amount of force saving by the number of rope strands, its mechanical efficiency is determined by the gravity of the object being pulled, the gravity of the dynamic pulley and friction.
The material of the pulley is generally HT15-33 cast iron and ZG35II cast steel. For light and medium work type of overhead crane pulley available gray cast iron HT15-33 and ductile iron QT-10 manufacturing; for heavy work type of overhead crane above the pulley, available cast steel ZG25 or ZG35 manufacturing. For the large diameter (D>800mm) of the pulley available carbon steel Q235-A welding.
The diameter of the pulley has a direct effect on the service life of the wire rope. Steel wire rope every time through the pulley, to bend once, so many times repeatedly bending, is one of the important reasons for the damage of steel wire rope. Normal work of the pulley can be flexible rotation by hand, lateral swing shall not exceed D0/1000 (D0 for the nominal diameter of the pulley); Shaft lubricating oil groove and oil hole in the chips, dust and other spoils must be cleared, check whether the oil hole and bearing spacing sleeve on the oil groove is aligned; Pulley cracks, should be scrapped, not allowed to weld; Pulley rope groove radial wear does not exceed 30% of the rope diameter; Pulley groove The wall wear should not exceed 30% of the original wall thickness; the defective area in the shaft hole should not exceed 0.25CM
2 and the depth should not exceed 4mm; clean the pulley, check the wear condition of the pulley, and replace it in time if it exceeds the scrap standard. Cast steel pulleys can be welded and re-turned; cast iron pulleys, such as cracks or broken, are not allowed to be welded and should be scrapped and replaced; the oil hole and lubricating oil groove of the pulley shaft should be cleaned, and the bearings, spacer sets, expansion rings, etc. should be cleaned and installed.
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After-sale Service
1. Installation service of overhead crane available with:
Video tutorial support for whole installation process.
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