Of angular contact ball bearings and cylindrical roller bearing is analysed using the difference

Of angular contact ball bearings and cylindrical roller bearing is analysed using the difference between 2020 - 01 - 01 jia a guard ( Zenith steel thermal power plant) Angular contact ball bearings and cylindrical roller bearings are frequently used to power plant rotating equipment in our two kinds of bearings, especially in our 6 # unit desulphurization system used on the slurry pump is heavy use of these two kinds of bearings, as the main rotating parts of rotating equipment pump, do a good job in the maintenance of the bearing and the bearing to accurately in a timely manner to the problems of bearing for replacement work to maintain the normal operation of the pump meaning not words and Ming, and understand and grasp the commonly used daily bearing model specifications, using location of the job characteristics and for us to carry out the on-site equipment maintenance repair work there will be a big help. As below 6 # unit used slurry discharge pump bearing replacement bearing as an example of the two kinds of bearing of introduction and discussion: 6 # unit of slurry discharge pump type is 40 j - TL- 350, traffic: 10 m & sup3; / h, head: 55 m, power: 22 kw, speed: 1450 r/min. Main function is to produce the desulfurization absorption tower slurry discharge of sulfur to the desulfurization dehydration processing slurry treatment system. Field operation in May found a slurry discharge pump working there was a bigger sound, the judge has its bearing wear serious, need to change the bearing, and so on May 16, we live in contact manufacturer to be present and carry spare bearings under the condition of bearing before and after the second slurry discharge pump replacement. After remove a slurry discharge pump rotation axis, found the axis of rotation respectively used two models bearing, a total of three, respectively is the axis of rotation on both ends of the free end and transmission end respectively using a model for a NU311EM rolling bearings, the rolling rotor on the rotating shaft end bearing next to use again after a model for a QJ311MA rolling bearing; According to type and physical specification in the bearing, bearing NU311EM for a single row cylindrical roller bearings, bearing QJ311MA for a four-point angular contact ball bearings. Bearing NU311EM as a single row cylindrical roller bearings, the main structure consists of outer ring, inner ring, rolling element and cage, because of its is a cylindrical roller, roller and race as line contact, the contact area is larger, so the load capacity is big, mainly bear radial load, but because of its cage guard main effect is to end of the guide roller, should not bear the axial force of too large, so the bear axial load capacity is poor; And the NU type ( Single row) Axial movement, can adapt to shaft caused by thermal expansion or installation error and shell the change of relative position, can be used for free end bearing, as the radial bearing is used to bear radial load. Bearing QJ311MA as a four-point angular contact ball bearing, which is composed of inner ring and outer ring, rolling body, raceway, its characteristic is its carry certain radial force, but for the axial load of the bearing capacity is more outstanding, and can withstand two-way axial force, thus can be used for driving end for thrust bearing, is used to carry axial load. Major difference: the two different, the main difference is that a rolling element bearing is a spherical roller, is a kind of cylindrical roller. Also because of this reason and the differences between them. 1, the bearing capacity of different: the contact surface of spherical roller and cylindrical roller, spherical contact point, cylindrical contact surface is the line. So under the same size, cylindrical roller bearing radial load capacity is bigger than the radial bearing capacity of the angular contact ball bearing. 2, different speed, because two luoyang bearing roller contact surface is different, so the speed is different between them, the greater the contact area, the slower speed relatively. So the angular contact ball bearing with a spherical roller rotation speed on the advantage. 3, different noise: in the same size equals the bearing rotating speed, the noise of the cylindrical roller bearing than angular contact ball bearing. This is because they are two rolling element bearing contact surfaces of the friction caused by the different size is different. The greater the friction surface, the greater the noise will be. Considering the structure characteristics of the two kinds of bearings, combined with the slurry discharge pump for bearing type selection and use of location, result: bearing NU311EM is used as the pump shaft radial bearing, installation on both ends of the free end of the pump shaft, driving end to bear the radial force of pump shaft rotates, have the effect of support localization; And bearing QJ311MA as the main bearing of pump shaft axial force bearing, are installed on the drive end to take the motor drives the pump shaft rotates the main axial thrust, therefore in the slurry discharge pump is the normal work of the main bearing bearing, so its appear wear away the probability of damage is relatively high, so for this kind of bearing field should be well often add grease, monitoring its vibration temperature conditions at the same time, prepare some more about this type of bearing spare parts to be replaced in a timely manner.