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The fan is tested by dynamic balance. Because of its high speed, it has a high balance requirement. Especially the impeller of the fan is very sensitive to the imbalance of the periphery, but the slight imbalance of the heart is not required. Very high. According to this feature, the failure of the impeller can be repaired by the following methods:
1. If the rivet head of the impeller is worn, it can be welded by welding the impeller body and the hub to return the worn rivet head to its original normal state.
2. In the case where the fatigue crack is likely to occur at the rivet hole, the new welding rod which has not been used may be used for welding and repairing the crack, but the symmetry of the axial center of the impeller is performed, and the remaining welding rod of the crack is left in the crack. At the same place, a new electrode is used to repair the rivet hole crack. The remaining electrode after welding is as long as the remaining electrode when the symmetrical rivet is repaired to ensure that the weight of the weld is equal. If there is no crack at the symmetrical rivet hole, the electrode should be welded here to offset the newly added welding weight at the symmetry rivet hole crack. According to this method of symmetrical compensation, the crack can be repaired by welding.
3. A simple dynamic balance test of the impeller is also very simple. After the impeller is lifted up, move it by hand to make it gently rotate. If it is not balanced, it will stop at the low point of zui and swing left and right. If there is a bias, you can spot weld on the opposite impeller, increase the weight to balance, or use the angle grinder to grind away the weld marks of the heavy impeller, so that the balance can be achieved, so that the fan can be repaired and normal work. Note that in the repair process of the fan, it is not possible to use spot welding for spot welding, and leave the weld mark on the impeller so as not to affect the balance of the fan impeller, and the purpose of repair cannot be achieved, resulting in greater loss.
Grinder fan repair method
The pulverizer is a kind of agricultural machinery which is more commonly used. The fan on the pulverizer is in the working process. Because the rotation speed is very high, the working environment is bad, the sealing is not strict, the sand causes serious wear on the wind opportunity, and the impeller body and the hub rivet The head falls off and fatigue cracks appear at the rivet holes. How to repair the fan has become a thorny problem. The slightest maintenance method can not only achieve the purpose of repair, but also make the fan completely scrapped. This article describes a simple and practical maintenance method for reference.