Vertical mill classifier under poor bearing lubrication analysis and improvement

Vertical mill classifier under 2020 - bearing lubrication bad analysis and improvement 09 - 24 Wang Mingfeng ( Southwest university of science and technology) Article 7 a company new dry process cement production line for all raw materials and coal grinding adopt a series of vertical mill, a total of 17 units. Seven grinding machine in a year or so, the production of the classifier is current volatility, accompanied by abnormal noise, and difficult control of fineness and vibration phenomenon such as slants big, check found bearing under the classifier burn out after downtime. After workshop and equipment analysis is improved. A, the cause of the problem analysis process ( 1) Bearing burn out is less likely to be caused by bearing the quality problem, because never appear the phenomenon of burning bearing. ( 2) The possibility of assembly or installation problem is lesser also. At the beginning of the grinding machine installation commissioning to normal operation, all did not appear abnormal classifier and fineness of vibration control difficult phenomenon, and all is in the mill running for about a year to appear the malfunction. ( 3) The possibility of bad lubrication and sealing effect is poor. Classifier upper and lower bearings is to use manual grease lubrication pump oiling. From the point of damage the appearance of bearings, bearing, few of residual oil and has dried up and bearing retainer and the ball badly worn. But for classifier of upper and lower bearing lubrication, workshop and team have been quite seriously, each class are strictly in accordance with regulations of the system of gas filling grease, and oil is joined the tubing, arguably should not have been bearing the lack of oil. Finally will be below the classifier cone bearing and the bearing end cover discovered after tear down, the tubing exports have not arrived at the location of the bearing ( 50 mm apart) , and most importantly, tubing and sealing device of the bearing is not regulated, and oil is constantly add tubing, but does not directly add to the bearing, there is no pressure sealing device has not been formed, the grease no into the bearing inside, but outside the bearing layer by layer up, did not have the effect of lubrication. Second, the main purpose of the improvement measures to improve is to add oil to the bearings, also make the bearing can get very good seal so that the formation pressure smoothly into the bearing grease inside. ( 1) The grease with welding way of tubing 50 mm long, make the tubing to the position of the bearing. ( 2) Below the bearing have bearing end cover, can have the effect of sealing, so must the next bearing above make a seal. Measuring inner diameter, measuring the bearing of the central axis as a classifier by about 30 mm above position within the pyramidal circle as the outer diameter, made a 3 mm thick steel plate sealing ring, along the centerline are divided into 3 pieces, the welding in the cone of the inner circle. And ensure the sealing ring inside the circle with center axis has a 5 mm gap and fixed felt the seal in the clearance. Lubricating oil tube through the sealing ring at the same time. Before and after improvement classifier under bearing structure as shown in figure 1. Figure 1 in bearing structure under vertical mill classifier three, improvement effect since improved, using a long time of four years, short of two years, as long as to ensure normal lubrication and inspection, bearing burned-out occurred again, classifier is smooth and reliable. Source: 'cement'