Course 2 about Belt Splicing

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 Running the splice with the joint

For strongly tensioned belts or conveying systems with relatively small pulleys the joint is laid as shown in the diagram, i.e. the splice runs with the joint. The flexing stress occurring on the pulley does not press against the joint and has no point of action at which to press the top fabric joint open 




Important information

Short driving belts and special-purpose belts are frequently cut to size from material supplied in rolls and spliced in the workshop.

If these belts are permitted only slight tolerances in their spliced length, a length is first cut roughly to the size required and the cut piece is left stretched out for approx. 24 hours.

Contraction strains remaining from produced can thus be compensated before the belt is finally cut to close tolerances.

Measuring the belt length in the stretched out position would result in a circumference corresponding to this measurement approx. at the center of the belt thickness.

In order to obtain the internal circumference required, measured on the bottom cover of the belt, an allowance of 3 x  belt thickness must be added to the belt length. When short driving belts or special-purpose belts are spliced in the workshop, the length to be marked is thus:

Spliced length + overlap + (3 x belt thickness) 

The second belt end is then folded over and placed on the stepped belt end. The two ends are meticulously aligned and controlled with a cord, the centerline marked when biasing the belt end being a valuable aid.

The steps cut in the prepared part are then transferred to the other end of the belt, the steps being marked out with chalk on the belt edge and marked on the belt end with a chalked string when the belt has been folded back. This end is then stepped too, in the method described above. 

When both ends of the belt have been prepared for splicing, they are laid down on each other to check for dimensional accuracy


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SPECIFICATION OF BELT CONVEYORS.PPT

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