Bulk cement base screw conveyor bearing structure improvement

Bulk cement base 2020 - screw conveyor bearing structure improvement 05 - 20 Shi Yanming ( Heilongjiang province ningan city cement plant) A, problem, put forward some factory is using a standard screw conveyor ( GX400x21m) , used for conveying powder material such as cement, raw materials, often appear in the process of using the following faults: 1. Rolling element bearing cage research bad; 2. Bearing sludge or grey research; 3. Bearing grind shaft or turn; Section four head screw axis pin fracture. Can easily be seen in the second, the analysis of the causes for the failure, seriously analyzed the cause of the failure, that is mainly due to the standard of screw conveyor head, tail bearing inside the casing, the conveying process, the bearing seat is located in the ashes buried or high concentration of dust, although have sealing device, but as a loss, bearing easily into ashes, destroyed the bearing lubrication, leading to the failure often occurs. Another section because of bearing seat and head screw axis pin inside the casing, when the repair and maintenance disassembling so very laborious, time-consuming, brings difficulties to work. Three, improvement of design by analyzing the main problem lies in the improper position of bearing seat, and then to the head of the screw conveyor, stern bearing structure, location, the types of bearings, sealing device for design improvement. See figure 1 and figure 2 before and after improvement. 1. In guarantee the principle of rotational structure strength and stiffness constant, from bearing shell move to the outside of the casing, and the cup type bearing housings instead and tile type, in order to facilitate maintenance and repair. 2. Improved in order to easy to install to adjust, we will be the original structure of the two sets of cone roller bearing ( 7614). , by looking at the bearing performance table instead of a set of double row centripetal spherical roller bearing, 3614). , this type of bearing allows for a larger inner ring external ring tilt ( Less than 2 & deg; - 3° ） , and can also carry axial load in either direction, its characteristic is suitable for the operating characteristics of screw conveyor screw axis. 3. To facilitate the replacement screw shaft pin head section, also pin position appropriate will be moved to the outside of the casing. 4. Sealing device instead of the simple structure cup type felt pressure structure, felt so convenient to replace, improve the sealing effect. Four, the improved effect is improved, through two years of operation proved that the improvement is reasonable and reliable, put an end to the the above failure due to bearing into ash, improve the service life of the bearings, also due to the improved bearing seat, pin, bearing type, easy to repair, maintenance, so as to improve the operation efficiency of transmission system. Source: the bulk cement