Metallurgical gearbox bearing application technology (2)

Source: Bearing network time: 2013-01-28

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Bearing public service cooperation <br> Metallurgical gearbox bearings are generally in heavy duty, impact load, high or low speed and harsh working environment; correctly select the bearing public service cooperation not only easy to bearing the device; together can guarantee heavy load, impact load Under the condition, the bearing will not show the running condition. Generally speaking, the bearing rotating parts are selected for interference cooperation; the non-moving parts are selected to use the gap cooperation. The bearing practice cross-over cooperation scale is not only changed according to the bearing size; and it is used in heavy load and high speed. Under the conditions, the interference cooperation should be selected more than the conventional application conditions. When the inch tapered roller bearing is used, the difference between the English and the metric bearing's own service belt should be paid attention to and the scale of the cooperative shaft and the bearing seat should be adjusted accordingly. Figure 4 shows that the size of the inner and outer diameters of the inch bearing is "plus civil service"; it is the opposite of the metric bearing. If the shaft and the housing are still in accordance with the metric bearing, (18) Pu Xinxinæµœé”¨æ¦è§¯ æµœé”¨æ¦è§¯ è´¾ è´¾ å²¢ å²¢ é¦ŠÎ æ²§è¢„ é¦ŠÎ æ²§è¢„ è°Œ è°Œ è‹‹Î“ è‹‹Î“ è‹‹Î“ è‹± è‹± è‹± è‹± è‹± è‹± è‹± è‹± è‹± è‹± è‹± è‹± è‹± è‹± è‹± è‹± è‹± è‹± è‹±Recommended scale. Compared with English bearing; metric large-scale bearing public service cooperation selection is relatively simple; about heavy load, bearing inner ring rotating outer ring stop operation conditions; large-scale self-aligning or cylindrical roller bearing with inner diameter scale 320 ~ 500mm; The shaft can be used with r6 public service scale. For self-aligning or cylindrical roller bearings with an inner diameter scale exceeding 500mm; the shaft can be used with r7 public service scale. The aligning or cylindrical roller bearing housing can be selected for H7 or G7.
Initial clearance of bearings <br> The initial clearance of tapered roller bearings is different from that of ball bearings, self-aligning and cylindrical roller bearings; it refers to axial clearance (BEP); other bearings are radial clearance (RIC) As shown in Fig. 5, the initial clearance of the bearing determines the bearing device and the working clearance after the operation. The clearance of the bearing determines the large bearing load bearing area. The å²¢ è· èœ— èœ— èœ— èœ— â‰¡è£‰è ¡å²¬ å²¢ å²¢ã·éž’ ã·éž’ åŽ é—¯æƒºèŠ° é²Ž é²Ž é²Ž é²Ž é²Ž é²Ž é²Ž é²Ž é²Ž é²Ž é²Ž é²Ž è´¾ è´¾ è´¾ è´¾
Tapered roller bearing clearance is too large to be able to exhibit roller wear or impact cage; incurs the cracking of the cage. The initial clearance of the bearing is too small, which will cause the bearing to heat up severely; and the bearing locks, burns, etc. .
The initial clearance of the metallurgical gearbox bearing should be calculated according to the interference cooperation of the shaft and the maximum rotational speed of the bearing. When the inner ring of the gearbox bearing cooperates with the shaft, the outer diameter of the inner ring of the bearing will swell and eat some initial Clearance; the initial clearance minus the interference lost by the interference cooperation is the bearing clearance (MEP) of the bearing. Generally speaking, the inch double-row tapered roller bearing does not exceed 400mm on the inner diameter scale; the clearance after the device should not be More than 0. 5mm. For large-scale bearings with an inner diameter exceeding 400mm; the maximum clearance after the device can be expanded to about 0.6 mm.
Metallurgical gearbox bearing initial clearance selection generally does not consider the ambient temperature; but only consider the difference between the inner and outer ring temperature of the bearing; because the ambient temperature will cause the shaft to swell; but the influence of the ambient temperature of the bearing seat will also cause thermal expansion. After the bearing device The clearance (MEP) reduces the clearance of the inner and outer rings of the bearing and the temperature rise of the bearing; the end bearing working clearance (OPE). The metallurgical gearbox large tapered roller bearing is considered for safety clearance; the end of the working clearance It is generally not allowed to present negative clearance. The initial clearance selection method for metric cylindrical and spherical roller bearings is similar to that of tapered roller bearings, but it is more simple; generally speaking, for large scale, bearing inner ring interference cooperation, outer ring clearance cooperation, heavy load Operating conditions; bearing initial clearance can be used to standardize the size of C3 clearance.
Bearing device dimensions <br> The bearing dimensions of the bearing mainly include the shoulder and the bearing seat shoulder diameter scale; the maximum chamfer radius of the shaft and the bearing seat. About the tapered roller bearing; the device scale also includes the cage safety clearance dimension. The shoulder and The diameter of the bearing seat shoulder should be strictly selected according to the bearing demand. Actually, a certain fan fan V å²¢ å—£å¬— å—£å¬— å—£å¬— å—£å¬— æ„Ž æ„Ž å“Ÿãƒƒå©Šæ¡“ å“Ÿãƒƒå©Šæ¡“ é½¿è½® é½¿è½® é½¿è½® é½¿è½® é½¿è½® é½¿è½® é½¿è½® é½¿è½®The maximum chamfer radius of the bearing housing should be smaller than the inner and outer ring chamfering radius of the bearing itself; the chamfering radius of the shaft and the bearing housing may cause the bearing to be in place; the inner and outer rings are inclined; then the bearing is normally used. The total return; when depicting the metallurgical gearbox ; should pay attention to the device scale of the bearing; should not add or cut the rule scale.
The harsh working environment of the metallurgical gearbox puts more stringent demands on the bearing used; the high-performance bearing is selected; the correct use of the bearing is a prerequisite for ensuring the safe operation of the gearbox.

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