Innovative metal repair techniques for repairing wear in centrifuge bearing housings

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This post was last edited by ljtjbx on 2016-4-5 at 13:56. Innovative metal repair techniques for repairing wear in centrifuge bearing housings. Metal repair techniques; repairing centrifuge bearing housings; wear in centrifuge bearing housings; centrifuge bearing housings. I. Problem analysis: Centrifuges are filter-type centrifuges that operate continuously or intermittently, and they can be controlled either automatically or manually. The centrifuge is one of the main equipment in the chemical industry; it separates solids from liquids by utilizing centrifugal force. It generally consists of components such as feeding, washing, dewatering, discharge, etc. The feeding, washing, discharge, and other processes are controlled by solenoid valves and pneumatic valves. The centrifuge tank is the key component for achieving solid-liquid separation, and it is driven by a three-phase AC motor through a belt drive. Based on the characteristics of this process, the material is primarily a solid-liquid mixture at the initial stage; the load is relatively high when it first starts operating. Once a certain rotational speed is reached, the liquid flows outward due to centrifugal force, so that part of the liquid is separated first. As the motor’s rotational speed increases further, the load decreases accordingly. Its working principle involves using a rotating drum to cause the material inside it to spin at high speed; the centrifugal force generated as a result is used to separate a suspension of two liquids with different densities that are immiscible with each other, along with solid particles. Centrifuges are widely used in industries such as chemicals, petroleum, food, pharmaceuticals, mineral processing, coal, water treatment, and shipbuilding. 　　During the long-term operation of the centrifuge, the surface of the bearing chamber undergoes permanent deformation due to the compressive force exerted by the outer ring of the bearing and various combined mechanical forces. However, metal materials have poor compliance, which easily leads to clearance between components. If this is not detected and addressed in a timely manner, the clearance will continue to increase, resulting in wear of the bearing housing. 　 Repair of wear in the centrifuge bearing chamber. This centrifuge is a horizontal scraper-discharge centrifuge, with an inner bore diameter of 280 mm for the bearing housing and a bearing width of 74 mm. The bearing chamber is severely worn, with uneven wear; the maximum wear amount is 1 mm. 　　II. Comparison of repair methods: For wear in the bearing housing, traditional methods involve welding repairs followed by boring, or electroplating as a treatment option. However, regardless of the method used, the biggest drawback is the need to disassemble and transport the equipment in large quantities, which requires significant effort and resources. Additionally, the limitations of the electroplating process are also quite significant. 　　 Repair process: Bearing chamber wear is a common issue in industrial enterprises, severely affecting their normal production. To avoid the losses associated with disassembly and repair, companies often resort to welding methods to address the issue; however, the results of such repairs are not satisfactory. This approach is even ineffective for bearing housings that are severely worn. The main reason is that wear in the bearing chamber results in an irregularly uneven surface at the worn area, and large-scale welding repairs cause thermal stress deformation. Secondly, even after repair, there can only be linear or even point contact; under the effects of shock and vibration from the equipment, stress concentration occurs, leading to further wear of the bearing housing. 　　 .