Why does the return-side belt form a smaller diameter after the first two months, and no longer touches the upper rollers? Is this serious?
The overlap of the return-belt is at the bottom of the tubular belt. The weight of the belt itself tends to cause the width of the overlap to increase as one belt edge wraps inside the other, thereby reducing the pipe diameter marginally. This phenomenon is normal and begins to occur within a month or so of hot commissioning, as the belts rigidity reduces with service. This does not usually impede reliability or the operation of the conveyor.
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