The Printing Center of Zhejiang News Group currently has 7 SSC web offset printing production lines, 2 of which are composed of 4 paper racks, 3 towers and 1 folding machine. Put into production; the other 5 lines consist of 2 paper racks, 2 towers and 1 folding machine, which were installed and commissioned in September 2003 and put into use at the end of 2003. Generally speaking, the use of SSC production line is very good, but the rotating structure of the rubber roller, the special specifications of the seal and the selected bearings have brought a lot of inconvenience to daily use and increased the cost of use. Because the selected bearing is an imported part, the inner diameter is 19.05mm, which is a non-standard part. The inner diameter and thickness are the same as the domestic standard bearing 6004, and the purchase price was about 320 yuan at that time. If a better water roller is used, the bearing has a service life of about 3 months; if a poor water roller is used, the shortest service life is only 7 days. 1. From the analysis of the damage of the water roller bearing, it is found that the structure of the water roller has the following problems. (1) The cost is too high. The imported bearing 88y0043C3 is too expensive. As long as the mandrel with a value of about 0.0 yuan is replaced, the 88y0043C3 can be completely replaced by the domestic standard bearing 6004. (2) There is a problem with the seal. Especially the water roller, some shaft ends need to be immersed in the dampening solution. When the pH value of the dampening solution is less than 6, the bearing will be corroded quickly, and the balls cannot rotate normally, which will eventually cause the bearing to rust and run away from the inner and outer rings. The roller body, bearing and mandrel are all scrapped. (3) The problem of axial force. In addition to the corrosion damage caused by the intrusion of the fountain solution, the bearing will also appear 'falling apart2. Solution (1) Make a self-made mandrel, adjust the size, and replace the imported bearing 88y0043C3 with the domestic standard bearing 6004. (2) Modify the rubber roller body and set up a reliable sealing structure to prevent the fountain solution from immersing in the bearing. For the 5 SSC production lines we use, Shanghai Gauss Company has improved the above two problems according to our drawings. (3) Decompose the axial force of the 6004 ball bearing, that is, add a set of 51104 thrust bearings to the shaft end. At present, we are still gradually improving the shaft end structure of the rubber rollers of all SSC production lines. Judging from the use of the improved rubber rollers, the effect is very good. Now, no matter whether it is a water roller or an ink roller, as long as there is no problem with the rubber surface, there is absolutely no problem with the shaft end structure and bearing, and it can be used for a long time. Through improvement, in a service cycle (10 hours of printing per day, generally a rubber roller 6) has a service life of about 1 year), even if the bearings are replaced when the rubber roller is replaced, it can save about 600 yuan. Our printing center has 16 towers, and each tower has 48 rubber rollers. After rough calculation, after the improvement, it can save more than 400,000 yuan for the newspaper in one service cycle.