After a long-term use of a LTM1180 truck-type crane, there are heat, abnormal noise, and oil leakage in the bearing parts of the rotary pinion in the rotary reducer. It was found that the bearing of the rotary reducer was worn and broken, and the outer ring of the bearing fell off. The rotary reducer housing is made of cast steel material, and has poor weldability, and white joint structure, pores and cracks are easily generated during welding. The two bearing housing holes are equipped with 3524 and 3526 type bearings respectively. The two seat holes have high precision and their diameters are (215+0.01)mm and (260+0.01)mm respectively. When the crane rotates, the bearing housing hole is subjected to a certain vibration shock, so the hardness of the material of the seat hole is required to be moderate, and it has certain impact resistance and vibration resistance. The following describes the repair methods for the three types of housings. Welding method The welding knot repairing process is as follows: First, after cleaning the rotary reducer housing, use a boring machine to boring the seat hole, and then appropriately increase the diameter of the seat hole; secondly, put the housing into the oven and preheat it to about 400 °C. Then heat the seat hole to red hot state (about 900~950 °C); again, use copper alloy electrode to weld to a predetermined thickness, then put it into the oven (temperature is about 250 °C) to slowly cool, or heat treatment with infrared heater Finally, the surfacing hole is finished to the design size. The advantage of adopting this scheme is that the bearing housing hole has better impact resistance and vibration resistance, stable quality and long service life. The disadvantage is that the welding repair process is complicated, the cycle is long, the cost is high, and it is easy to wear and peel off after repair. 2. Nesting method The repairing process of the inserting method is as follows: Firstly, the bearing hole is cleaned, and then the hole is cut by a boring machine to increase the seat hole by 8 to 10 mm; secondly, the cast steel inlay is set, and the outer diameter and the outer diameter of the insert are set. The cut seat hole is an interference fit; finally, the insert is mounted into the enlarged seat hole and finished to the design size. The advantage of adopting this scheme is that the method is simple, the cost is low, and the repair time is short. The disadvantage is that the gap between the insert and the shaft is relatively high. If the gap between the inner hole of the insert and the bearing is too small, the bearing is easy to heat; if the gap between the inner hole of the insert and the bearing is too large, the bearing is likely to slip. 3. Partial replacement method The repair process of the partial replacement method is as follows: First, the bearing part of the rotary reducer is mapped, and a new bearing seat is processed with a material with higher strength; secondly, the bearing seat is turned off from the casing of the rotary reducer by a lathe, and The vehicle makes the interface and thread connecting with the newly-made bearing housing; again, the newly-made bearing housing is connected with the reducer housing through the thread, and the reinforcing rib on the reducer housing is repaired by welding, and then the interface portion is welded; Finally, the new housing bore is finished to the design size. According to the comprehensive analysis, although the first two repair methods have many advantages, they are not suitable for the repair of the bearing housing of the rotary reducer housing. Therefore, it is decided to repair the rotary reducer housing by the partial replacement method. The material for machining the reducer housing is made of high manganese steel. The commonly used high manganese steel is Mn13, 40Mn18Cr3 and 50Mn18Cr4. Although the original hardness of the material is not very high, its plasticity and toughness are good, and the hardness after processing can reach HBW500. After the bearing of the rotary reducer is repaired by the partial replacement method, the retesting machine is installed, and the rotary reducer works normally. Rain Shower Head with Handheld Shower Faucet Set Complete with High Pressure.Includes one-piece cartridge to simplify installation and maintenance.Our shower system provides free replacement parts in 5 years. Shower Faucet,Shower Handle,Shower Diverter Valve,Delta Shower HESHAN CAIZUN SANITRAYWARE CO.,LTD , https://www.caizunsanitaryware.com
After a long-term use of a LTM1180 truck-type crane, there are heat, abnormal noise, and oil leakage in the bearing parts of the rotary pinion in the rotary reducer. It was found that the bearing of the rotary reducer was worn and broken, and the outer ring of the bearing fell off. The rotary reducer housing