N2500 classifier bearing oil analysis and emergency response

N2500 classifier bearing oil analysis and emergency treatment of 2020 - 12 - 01 Feng Jinhua guang-cai li ( JiYin cement co. , LTD. ) The company special cement production line is used in a N2500 classifier ( Production of 90 ~ 150 t/h, 145 - speed 210 r/min, the speed range 450 ~ 1375 r/min, motor YTP315M - 4 132千瓦) As the frequency control of motor speed, the central control. In March 2011, found that the lower part of vertical shaft bearing oil spill, spill about 30 l per shift, after stop check found that the oil seal wear and vertical spindle surface grinding crack with oil seal contact position. One, the cause analysis for production of special cement, breed conversion is frequent, it is necessary to adjust the speed of the classifier ( Usually between 5 ~ 45 hz) 。 Classifier is under a state of uniform rotation of the rotor, suddenly, the rotor can produce larger shaking moment, duration in 5 - 15s。 Make vertical shaft bearing, oil seal and spacer ring wear and damage the oil seal of metal skeleton, spacer ring and have the wear on the surface of a vertical shaft, resulting in oil spills. Second, the solution to reduce the influence on production, the company by using the set set of method of vertical shaft wear in emergency repair. （ 1) On the original end cover seal hole hole enlargement by & Phi; Processing to 130 & Phi; 160, the original two B130 & times; 160× 12 oil seal for B160 & times; 190× 12, a & Phi; 160× 130× 3 spacer ring with & Phi; 190× 160× 3. The end cover structure as shown in figure 1. Figure 1 end cover structure ( Brackets to change before the size) （ 2) Processing a shaft sleeve, as shown in figure 2. Bushing internal placed two & Phi; 7 x140 type O sealing ring, the purpose is with the shaft seal. On the shaft sleeve uniform three M6 screw hole used with shaft. Figure 2 collar structure ( 3) The shaft sleeve ( Screw hole position up) Set into the vertical shaft, the top to the upper thread position, and then three threaded holes marked on shaft, with the hand electric drill hole after remove the collar ( Φ Bit 6 mm, 5 mm deep) And then use six horn side fastening screws ( External can't bare to prevent oil seal damage) The collar clamp on the shaft. End cover in the case of does not hurt oil seal set up slowly, with bolts. At the same time, adjust process, adopt the method of step by step during speed adjustment, adjust several stages, not one pace reachs the designated position. Third, the effect through simple processing, oil leakage is resolved, save the cost of the new shaft and long time parking caused economic losses. Source: 'cement'