Dry quenching speed reducer bearing sound processing and force analysis

Dry quenching speed reducer bearing sound processing and force analysis - 2019 06 - 14 jian-xin Yin ( Hunan steel coking plant, hunan xiangtan 411100) Abstract: introduction to the dry quenching coke cans lifting machine of decelerate of planet of structure, sound and the damage to the bearing force analysis. Key words: dry quenching; Ascending planet reducer; Bearing sound processing; Introduction of force bearing analysis on the dry quenching coke cans hoist machine of decelerate of planet of loading coke dry quenching system is unique, the key of special lifting equipment. Through two 250 kw power input speed 743 r/min motor, planetary gear train after the overlay, the output torque of 250 kn. M, the speed of the production run time in order to adapt to different extents, hoist lifting mechanism adopts frequency control of motor speed. Allows it to load, frequent downtime, working condition is not stable, belongs to the periodic intermittent running repeatedly, and reduction of speed reducer gear box is large, complex structure, there is a pair of planetary gear train and the monitoring and fault diagnosis work to bring huge difficulties. This paper introduces the hoist machine of decelerate of planet of structure characteristics of bearing sound fault handling, and the damage to the bearing force analysis, provide the reference for colleague. 1 structure characteristics of the dry quenching coke cans ascending speed reducer, a total of five to slow down, the first level input, secondary planet, the sun wheel and input stage, middle level five ends output connected to the drum. Double motor speed ratio is 52. 23, single motor speed ratio of 104. 46, in addition to the planetary mechanism for straight tooth gear tooth, the rest are inclined teeth, bearing adopts double LieDiao heart ball bearing, using 320 # gear oil lubrication, the bearing capacity is strong, impact resistant, stable operation. Its structure is shown in figure 1. Fault handling after 2. 1 discovery process the reducer since put into production, has been stable operation more than six years, the same type product also created the record of stable operation for 12 years. Daily inspection, listening, occasionally temperature measuring vibration, in open check the bearing clearance, abrasion of gear, oil change. By chance a day listening to be listening, found in high speed reducer internal appear when overloading utter teng, no other time. Again and again each position to monitor, recognized as the reducer shaft 1 # 4 motor bearing the loudest voice, the most obvious. Every three seconds when high speed heavy word teng once, reducer 42 ℃ temperature without exception, vibration 0. 3 mm/s normal. Please professional vibration spectrum analysis, confirm the fourth shaft position also have sound, judgment for bearing failure. To avoid a big accident, decision for bearing replacement. 2. 2 check the processing for reducer lubricating oil sample analysis, test results for cleanliness grade 12, in general, there are iron powder, kinematic viscosity value of 363. 9 is normal. Open check after planned downtime, shaft bearings SKF 23160 cc/W33, 4 with feeler check found that the gap is 0. Check the clearance of 0 5 mm, two years ago. 3 mm, the standard of the bearing clearance: 0. 19 - 0. 28mm。 The ball body and the bearing outer ring is smooth, inner ring cannot be observed. By the fourth axis integral lifting crane to barrack repair, no abnormal appearance inspection, barring sasha vujacic's voice from time to tome, accompanied by a small amount of metal at the end of the iron filings. Because the quantity is less, the steps of bearing inner ring and production time is tight, cannot remove Lamar, decisive use gas cutting cutting remove bearing, found that the bearing inner ring raceway fatigue peeling off on the right is serious, another race in good condition. Specific conditions as shown in figure 2, figure 3:2. Three axis at that point back to install test field measurement calculated with bearing value for 0. 1 mm, interference quantity is larger. After the new bearing is clean, use bearing heater is heated to 150 ℃, measuring the diameter of the bearing inner ring after heated slightly larger than the diameter of axis, stop heating, hot charging immediately. At the same time of reducer to arrange maintenance personnel synchronous frame to clean under. Back pack, slow chassis decent sealant evenly daub, bolt in the middle on both sides began to tighten, tighten torque of 3980 n. m。 When the maintenance take 15 hours, commissioning reducer sound is eliminated. 3 force analysis found that the damage of bearing inner ring only the outside of the fatigue spalling is serious, the rest is smooth, consider whether a shorter life because the surface force is too large. Due to the gear for helical gear, additional axial force operation process of. Reducer running in the process of ascension and decline in two operation condition of the axial force, the calculation details such as table 1, the axial force direction as shown in figure 4, figure 5. To see whether full load or light load, axial force of the fourth shaft is directed not damaged bearing end, means that the inner side of the damaged bearing raceway bear the additional axial force, some worse than in other parts of the force. Full load of 151 kn, light load of 117 kn, meet why damage within the medial end bearing raceway in large area adjacent raceway fatigue spalling and smooth intact. 4 conclusion (1) this paper introduces the basic structure and hoist machine of decelerate of planet of daily mainly by checking for simple temperature measuring vibration, use to listen to the sound change rod observation for fault monitoring and diagnosis, to check the sense of responsibility, professional skills, the demand is higher, advice, not regular monitoring oil change on a regular basis; (2) the reducer should do a good job cleaning maintenance, don't pollution of lubricating oil, big body up and down cover must check the sealing surface and the contact area, lest appear the phenomena of outer running; (3) reducer as helical gear, there are always some axial force, force big appear fatigue spalling in advance must be a race. Advice to on-line monitoring on a regular basis, bearing clearance measurement, change regularly on a regular basis. （ Source: the coalification run dry quenching technology exchange learning platform)