Bobcat Tire,Skid Steer Tire,Tire And Rim,Bobcat Tire With Wheel Car Lift,Field Tire Co., Ltd. , http://www.nbbustire.com
1 Reason analysis (1) Using the clinker of the manufacturer without cooling, directly enter the mill, and the amount of spray water that is cooled is very small, resulting in high temperature of the cylinder. The temperature of the cement is measured up to 130 ° C, and the inside of the mill is ventilated. The conditions are very poor, the steam in the whole mill is very large, people are sultry and the temperature is as high as 38 °C. Since the large ring gears are all in the split type, the heat is transmitted to the large ring gear through the flange on the cylinder. When the joint surface of the ring is designed, there is no gap left, the internal expansion of the large ring gear is larger than the outside, and the lever is formed by the high point inside the large ring gear, causing the large ring gear to open the interface joint surface, and the large and small gears mesh at the joint surface. It causes periodic vibration and noise of the mill, and the current fluctuates greatly. Due to the large vibration, the connecting bolt is broken for a long time, the heat of the cylinder is high, and the ambient temperature is high. In addition, the temperature of the cooling circulating water itself is relatively high. The flow rate is relatively small, which causes the tile temperature to be high and frequently alarms to stop the host.
(2) The temperature of the mill barrel is high when the grinding is stopped, the heat in the grinding body and the material is not easy to be dissipated, and the thermal expansion of the barrel is different from the upper and lower sides. Under the action of the gravity of the grinding body and the material, the barrel of the grinding machine is bent, causing large teeth. The center of the circle is also constantly changing; the pinion is fixed to the foundation through the bearing housing, and the center does not change, resulting in a change in the center distance of the large and small gears. Since the user's teeth are too small when the user is installing, the top tooth phenomenon is caused, causing the small gear bearing to vibrate greatly. When used by the factory, the lubricating oil contains a large amount of dust, which causes the abrasive grains on the tooth surface to wear, resulting in wear of the pinion.
2 Treatment measures (1) The production task of the factory is very tight. We decided to wear the grinding machine to remove the joint surface by 2mm, leaving the expansion gap. In order to prevent the bolt from loosening, the hot-tight method is used to tighten the stud bolt and use the spare. The nut is tightened. For the influence of the change of the center distance of the large and small gears, we have re-adjusted the tooth backlash and the tooth top clearance of the mill, and considered that the cylinder is bent due to the heat of the cylinder and the gravity of the material, leaving enough The tip clearance and the flank clearance are accommodated.
The wear of the pinion is mainly caused by the vibration of the top gear of the large and small gears, and has a great relationship with the quality of the lubricating oil. We have strengthened the sealing of the large gear cover to reduce the dust as much as possible, and at the same time replace the N220 lubricating oil with the N320.
In view of the high temperature of the cylinder, in addition to the small flow of cooling water and the small capacity of the circulating pool, it is found that the material in the grinding material is obviously too small by listening to the sound and checking the height of the material in the grinding mill, and the grinding body and the lining plate also generate a lot of heat. By increasing the capacity of the circulating pool, increasing the circulating water flow, increasing the internal ventilation and increasing the grinding material, not only increased the output, but also reduced the temperature of the cylinder, thereby reducing the temperature of the tile by 10 ° C, avoiding the Invar temperature. High and frequently stop the host.
By adopting the above measures, the mill has been running for more than two years, the large and small gears are running smoothly, the temperature of the tile is stable, the vibration is obviously reduced, the current is almost no fluctuation, the pitting phenomenon of the pinion is not expanded, saving maintenance costs and improving Production has created considerable profits.