φ4。 8 m x 74 m hydraulic gear wheel structure improvement of rotary kiln

φ4。 8 m x 74 m 2020 - rotary kiln hydraulic gear wheel structure improvement 11 - 20 Wang Fuhua ( Shandong ShenFeng cement group co. , LTD. ) A company & Phi; 4. 8米× 74 m rotary kiln production after about a year and a half time, three hydraulic gear wheel case of damage, main show is lower thrust self-aligning roller bearings 29264 severely damaged, bearing circle of upper and lower fracture, maintains a twisted and broken. And tied for the spherical roller bearings 23076 also have mild damage, cage wear serious deformation failure. But the top of the spherical roller bearings 3003788 intact. In about 3 months after replacement of the same model bearing appeared the same problem, bearing failure deformation in different degrees. After careful analysis, we carried out on the shaft, bearing, and wheel properly improved, good results have been achieved. One, cause analysis, after considering the influence of external factors, the inference is bearing strength grade choose small lead to damage. Two sets of the bottom of the bearing, the theory raised roller bearing 23076 not bear axial force, axial force acting on the bearing all 29264, and the bearing is light load series, early damage failure when stress is too large, then is the 23076 bearing damaged. In addition, in the process of replacement of bearing, found that inner sleeve phenomenon, bearing and shaft of fit tolerance selection is not reasonable, small amount of interference. Second, the ways to improve ( 1) Improve the thrust bearing load level, with 29448 bearing ( Heavy load series) Instead of the original 29264 bearing, bearing thickness increased to 122 mm. In addition, due to the 29448 bearing can withstand axial force, also have the function of the heart, the one dish bearing can completely replace the original two sets of bearing load, therefore also cancelled self-aligning roller bearing 23076. ( 2) Due to the original equipment drawings are not complete, not the accurate information of the original catch wheel. Therefore, in order to be on the safe side, improved the shaft and the bearing block a fit interference, as shown in figure 1. To avoid the for axial channeling damage to the bearings. Figure 1 the improved axis ( Material CrMnTi) Changing the structure of the wheel, the processing parameters, assembly tolerance requirements, as shown in figure 2. Prevent between wheel and axle is loose. Figure 2 improved wheel ( Material ZG40) Third, the effect of the improved, three bearings instead of two sets, saves cost, and improve the service life of the bearings, since the replacement after normal use more than 2 years, no any mechanical failure. Source: 'cement'