Crane Pulley Bearing Damage Causes And Improvement Measures

Crane pulley block is an important part of the crane, is also an important part of the crane lifting, the pulley block is generally composed of rolling bearings, pulleys, pulley shaft, rolling bearing sleeve, the structure to bear radial force is better than to bear axial force.The rolling bearing retaining ring, support ring and spacer are often damaged, resulting in the pulley can not rotate, and the steel wire rope is seriously worn, so that it can not be normally constructed.
If the bearing is damaged, it will directly affect the normal lifting of the crane. Therefore, BMB Bearings shares the common reasons for the damage of the crane pulley bearing and relevant measures for improvement below:
Crane pulley bearing damage analysis
1. Crane overload
Cranes have a load table, that is, when the crane construction work must be in accordance with the load table marked load lifting heavy objects, strictly prohibited to exceed the load table limited data operation construction.Crane in the design of safety factors, but the current domestic crane construction
The existence of overloading causes the reserved safety factor to be relatively small, and even cancels the reserved safety factor.This local mechanism of the crane is likely to appear damage and failure, lifting heavy overload, directly cause the lifting pulley part bearing stress increase, close to or beyond the stress range, which is the most direct cause of bearing damage.
2.Pulley quality child problem
The lifting pulley of the crane is directly wound with the wire rope, the wire rope bears all the weight of the hanging object, so the weight of the object is directly transferred to the bearing through the wire rope and the pulley.Due to bearing its own structure determines its ability to withstand radial force is far greater than its ability to bear axial force, so in under the action of axial force, bearing retainer is easy to damage, and damage of bearing ball racks, lead to bearing can not rotate, wire rope and pulley wear problems and eventually cranes can not work normally.
3.The crane construction in the air is unstable, there is shaking
Because of the existence of shaking will also lead to uneven bearing force, if the pulley is still rotating at this time, bearing ring bearing resistance significantly increases, in this case, the bearing ring is easy to damage, resulting in the ball around the ball, and then the bearing ring completely damaged, eventually damage the entire bearing, affecting the construction.
4.Crane design process
When designing pulleys and choosing bearings, safety factors must be considered and reserved according to load and construction conditions.If the selection of safety factor is small or the calculation error of load is large, the calculation of gravity borne by a single pulley is small, which will cause the selection of bearing is not appropriate, and the bearing force can not meet the actual work needs.
Improvement measures
1. Increase overload limiting device: calculate the maximum bearing force of the bearing according to the load table. When the load force of the bearing is equal to the rated force, an alarm should be issued to prompt the operator.When the load force of the bearing exceeds the rated load or the safety factor, the crane is locked under the action of the safety device, forcing the construction personnel to construct according to the crane load table, thus reducing the force of the bearing, playing the role of protecting the bearing and extending the service life of the bearing.
2. Strictly control the quality of pulley: improve the pulley production process and strictly check the inspection procedure of the bone pulley into the factory, control the flatness of the pulley rope groove center and the pulley center to meet the design requirements, so as to eliminate the bearing damage caused by the pulley.

3.Without affecting the construction effect of pull, increase the pulley block: increase the upper end of the pulley block, can increase the pulley rate, so as to reduce the force on the single pulley and bearing.Because the force is reduced, the safety factor of the bearing can be improved, the probability of damage can be reduced and the service life can be improved.
4.Overloading is strictly prohibited, and the weight shall be kept stable in the process of lifting and descending the weight, so as to avoid the uneven bearing force caused by the shaking of the weight and the increase of the axial force and the damage.
Supplier:BMB bearings
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