A line of vertical mill reducer of symptom and fault relationship were reviewed

A line of vertical mill reducer symptoms and fault in 2018 - relationship 11 - 04 Wang Xinhua ( Quanzhou ridge cement co. , LTD technology) Company raw material vertical mill is number one host device, main reducer is a raw material of the key parts in roller mill. Overhaul of the main reducer to run into production, can review sums up the main speed reducer of the relationship between symptoms and fault. Proper use and maintenance for our main reducer has important help, have a guidance for fault judgment. Symptoms: the lower part of the main reducer vibration and abnormal sound. The scene to listen, found to have abnormal sound, high-speed shaft vibration instrument display value is greater than 8 mm/s. Failure has three aspects: (1), wear bearing clearance is too large, and have a bearing inner ring fracture. (2), small gear shaft wear due to run in circle. (3), intermediate gear shaft of two tooth fracture. Processing method: replacement of bearing and intermediate gear shaft, the pinion shaft bearing assembly location by the 'turning, brush plating, grinding process for repair. Why we two high-speed spindle bearings for audio detection, did not find the bearing inner ring fracture? Because the bearing seats near the small bevel gear to detect, be detected bearing without fracture, is only the bigger clearance grinding. Bearing clearance excessive wear and inner ring is the causes of vibration, the intermediate gear shaft gear fracture two teeth are the reasons for abnormal sound. Symptom 2: main reducer have abnormal sound and vibration. To the scene to listen to, the main reducer have abnormal sound, and more and more big. Fault has four aspects: (1), bearing clearance, excessive wear. (2), thrust tile babbit turn tile. (3), the output flange connection with star frame is loose. (4), inner gear set and the sun wheel drum of excessive tooth wear. Methods: replacement bearings and inner gear set and the sun wheel; Thrust tile babbit casting and grind tile; Output flange and star frame with reaming and interference fit of the bolt. Bearing clearance wear too much and the inner gear and excessive sun wheel drum wear was the cause of vibration; Output flange connection with star frame is loose and thrust tile babbit turn tile are the reasons for abnormal sound. Through the internal parts of the main reducer remove damaged condition and we use the scene observed symptoms analysis and associated problems for us to accumulate experience, put forward the solution to the problem plays an important role, at the same time, improve the level of maintenance and operation also has the vital significance.