Pubdate：04-19-2022 Views：1472
Relatively little steering effect is obtained from the crown of conveyor pulleys. Crowning is most effective when there is a long unsupported span of belting (approximately four times belt width) approaching the pulley. Since this is not possible on the conveyor carrying side, head pulley crowning is relatively ineffective and is not worth the lateral mal-distribution of tension it produces in the belt.
Tail pulleys may have such an unsupported span of belt approaching them and may be crowned with benefit, except when they are at points of high belt tension. The greatest advantage is that the crown, to some degree, assists in centering the belt as it passes beneath the loading point; this is necessary for good loading.
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Take-up pulleys are sometimes crowned to take care of any slight misalignment that occurs in the take-up carriage as it shifts position. In general, crowned pulleys should be used sparingly, if at all, on fabric belts. With steel cord belts, all pulleys must be flat.
All pulleys should be level and should have their axis at 90 degrees to the intended path of the belt. They should be kept that way and not shifted as a means of training, except that snub pulleys can have their axis shifted when other means of training have provided insufficient correction. Pulleys with their axis at other than 90 degrees to the belt path will lead the belt in the direction of the edge of the belt that first contacts the misaligned pulley. When pulleys are not level, the belt tends to run to the low side. This is contrary to the old rule-of-thumb statement that a belt runs to the high side of the pulley. When combinations of these two occur, the one having the stronger influence will become evident in the belt performance.
