Tham khảo tài liệu 'the design of rolling bearing mountings (fag bearing co) episode 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 112 Plane sifter Sifters are used in flour mills to segregate the different constituents . groats grits flour . The plane sifter described in this example consists of four sections each comprising 12 sieves fastened to a frame. An eccentric shaft induces circular vibrations in the framesieve assembly. Operating data Starting power kW operating power kW speed min-1 total weight of balancing masses kN distance between centre of gravity of balancing masses and axis of rotation 250 mm total weight of frame and sieves plus material to be sifted kN. Bearing selection The drive shaft with the balancing masses is suspended from the top bearing. The supporting bearing must be self-aligning in order to avoid preloading. The bearings mounted are a self-aligning ball bearing FAG 1213 65 x 120 x 23 mm and a thrust ball bearing FAG 53214 70 x 105 x 28 8 mm . The spherical housing washer FAG U214 compensates for misalignment during mounting. The thrust bearing has to accommodate the weight of the drive shaft and balancing masses. The eccentric shaft of the sifter frame is supported by a spherical roller bearing FAG . This bearing accommodates the high centrifugal forces resulting from the circular throw of the sifter frame and sieves. Sleeve B is a loose fit on the eccentric shaft thus the spherical roller bearing is axially displaceable together with the sleeve and cannot be submitted to detrimental axial preloading. Machining tolerances Self-aligning ball bearing. Hollow shaft to k6 pulley bore to J6. Spherical roller bearing. Sleeve to k6 frame housing bore to K6. Lubrication The ball bearings at the top mounting run in an oil bath. The spherical roller bearing at the bottom mounting is lubricated by circulating oil. A thread cut in the eccentric shaft feeds the oil upward through sleeve B. From the top the oil passes through the spherical roller bearing and back into the oil bath. Layout of a plane sifter 112 Plane sifter The Design of
