Repair of worn impeller According to the existing impeller blade wear condition, spraying (surfacing) wear-resistant cemented carbide on the blade surface is an effective method to improve the life of the impeller. At present, the methods of adding wear-resistant layers at home and abroad mainly include: 1) surfacing layer of the working face of the blade working face; 2) wear-resisting layer of all surfacing welds in the severe wear area of ​​the blade working face; 3) lining the severely abraded area of ​​the impeller Plate; 4) re-grinding the wear layer on the lining plate; 5) affixing the ceramic piece in the severely abraded area of ​​the impeller. At the blade working surface and the intermediate plate, the wear is serious, the abrasive area is too large, the blade strength is too low, and the unsafe factor is too large. It cannot be simply restored like the first two pile wear layers, and only the above fourth method can be used. Lining the board and stacking the wear layer. That is, the strength of the blade is ensured, and the impact abrasion on the original weld is slowed down.
First, the original wear area of ​​the original blade is filled with 502 electrode. The lining plate is made of 16Mn material, and the thickness of 6mm is processed by chamfering 60° on both sides to ensure penetration and welding. The lining plate is drilled with 8mm~10mm holes in each section. After the lining plate is curved, it is matched with the blades, and then the holes are filled to ensure that the linings are not separated from the blades after the welds around the lining are abraded. The welding process uses preheating-crossing-short distance to reduce impeller welding deformation. The welding rod is a pile of wear-resistant welding rod, first welding the welding rod, and then supplementing the wear-resistant layer to increase the wear resistance. A vertical welded part on both sides of the middle plate, a new wear layer is added and joined to the wear layer on the lining. Finally, the wear layer is repaired to ensure the height and width of the wear layer. It is difficult to repair and repair the impeller. The requirements of each process are strict, ensuring the quality of repair, removing impurities, balance accuracy, and conducting strict dynamic and static balance test. After testing to meet the requirements, it will be re-invested in September 1998. normal operation. The vibration parameter measured on the day was V vibration = 0.4 mm/s. The vibration parameters indicate that the effect leaves are used to achieve the best standard for wheel operation after repair.
The sintering exhaust fan impeller is the key component of the sintering branch, the manufacturing process is complex, the precision is high, the cost is large, the equipment technical transformation and repairing the old waste are important topics in the equipment management of the sintering plant. With the method of adding lining and stacking wear-resistant layer welding, it is a good and effective method for the repair of severely worn impeller. After one year of operation records, it fully meets the technical requirements of the equipment. The fan impeller has been repaired and reused, and the life of the impeller has been increased from two years to more than three years, greatly reducing the cost of spare parts for equipment. Economic benefit analysis has saved more than 240,000 yuan for the production cost of the sintering plant. The impeller repairing effect provides useful experience for the technical transformation, savings, and efficiency of the equipment management in the future.
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