The installation of the hoisting head wheel and the bottom wheel drive shaft is easy to cause the hopper belt to run off. The main form of performance is that the transmission shafts of the head wheel and the bottom wheel are in the same vertical plane and are not parallel; both transmission shafts are installed in a horizontal position and are not in the same position. In the same vertical plane; the two drive shafts are parallel, in the same vertical plane and not horizontal. After the above situation occurs, the hopper belt is deflected, which may cause the impact of the hopper and the barrel and the tear of the hopper belt. In addition, the head of the hoisting machine is subjected to a large dynamic pressure of up to about 100 tons, and it is inevitable that crushing wear occurs at the bearing position due to long-term operation.
The traditional method is repaired by repair welding or brush plating, but both have certain drawbacks: the thermal stress generated by the repair welding high temperature cannot be completely eliminated, which is easy to cause material damage, resulting in bending or breaking of the parts; The thickness of the layer is limited, and it is easy to peel off. The above two methods use metal to repair the metal, and the "hard to hard" coordination relationship cannot be changed. Under the combined action of each force, the wear will still be caused again.
In response to the above problems, European and American companies currently mainly use the repair method of polymer composite materials, and the most mature application is the American Fusitlan technology system. The polymer material has excellent adhesion, excellent comprehensive mechanical properties, and can be free from disassembly and machining. There is no repair welding thermal stress effect, the repair thickness is not limited, and the metal material of the product does not have the concession, can absorb the impact vibration of the hoist, avoid the possibility of re-wearing, and greatly extend the service life of the equipment components. It saves a lot of downtime for the company and creates huge economic value.
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