The pulverizer is a kind of agricultural implement that is more commonly used. In the working process, the fan on the pulverizer has a very high rotational speed, and the working environment is harsh, and the closure is not strict. Sand and sand will cause serious wear to the wind, making the impeller and hub rivets. The head falls off and fatigue cracks appear at the rivet hole. How to repair the fan becomes a difficult problem. If the maintenance method is not proper, it will not only fail to achieve the purpose of repair, but also may cause the fan to be completely scrapped. This article describes a simple and practical maintenance method for reference.

The wind turbines are all subjected to dynamic balance tests. Because of their high rotational speed, the balancing requirements are also very high. Especially the impeller of the fan is very sensitive to imbalances in the periphery, but the requirements for the tiny imbalance in the heart are not Very high. According to this feature, the following methods can be used to repair an impeller-prone fault:

1. If the rivet head of the impeller is worn, it can be welded by pressing the impeller body and the hub, so that the worn rivet head returns to its normal state.

2. If the rivet hole is prone to fatigue cracking, the whole new unused electrode may be used to repair the crack. However, it must be symmetrically centered on the axis of the impeller, and the remainder of the weld at the crack must be left. Here, a new welding rod is used to repair the crack in the corresponding rivet hole. After the welding, the rest of the welding electrode is the same length as the remaining welding electrode during the repair of the symmetrical rivet to ensure that the weight of the welding repair is equal. If there is no crack at the symmetrical rivet hole, the electrode is also welded here to compensate for the new welding weight at the crack of the symmetrical rivet hole. Welding in accordance with this method of symmetrical reinforcement can repair cracks.

3. A simple dynamic balance test of the impeller is also very simple. The propeller is lifted and then hand-pushed to make it rotate gently. If the balance is not reached, it will stop at the lowest point and swing left and right. If there is bias, it can be spot welded on the opposite impeller, increase the weight to make it balanced, or use the angle grinder to grind away the weld mark of the biased impeller, which can also reach a balance, so that the fan can be repaired to work properly. Note that in the process of repairing the fan, it is not possible to use spot welding to weld the weld marks to the impeller so as not to affect the balance of the fan impeller, failing to achieve the purpose of repair and causing greater losses.

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