Introduction of Alloy steel Cast Crane Pulleys:
In the hoisting mechanism of the crane, the pulley plays a role of saving effort and supporting the steel wire rope and guiding it.
The pulleys of light and medium type bridge cranes can be made of grey cast iron ht15-33 and nodular cast iron qt-10.
For the pulley of the bridge crane with heavy duty type above, it can be made of cast steel ZG25 or ZG35.
For large diameter pulleys (D>800mm), carbon steel q235-a can be welded.
The diameter of pulley has a direct influence on the service life of wire rope.
Every time the wire rope passes through a pulley, it must be bent once. Such repeated bending is one of the important reasons for damage of the wire rope.
The smaller the diameter of the pulley, the more twisted and damaged the wire rope.
In order to make the wire rope have a certain service life, it is required that the diameter of pulley and the wire rope maintain a reasonable proportion relationship.
For the wire rope to pass through the pulley without being stuck, the radius at the bottom of the pulley groove should be slightly larger than the radius of the wire rope, i.e. R = (0.53~0.6) d.
Steel wire rope diameter d when the small value.
Deflection is not out of the groove, in order to make wire rope sheave on both sides of the Angle between 2 beta = 35 ° to 45 °.