The wide application of abrasive belt grinding devices makes the tensioning mechanism of the abrasive belt various, such as screw type, spring type and slider type. The eccentric tensioning mechanism is described below. The eccentric tensioning mechanism is shown in Figure 1. When the belt is tensioned or loosened, the locking bolt 12 is loosened, and then the squares on the eccentric cover 9 are pulled to make the eccentric cover 9, the eccentric bearing sleeve 7, and the end integrally connected together?
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