When the conveyor belt is lengthy or the weight of the transported good is great relative to the force/elongation ratio (elastic modulus) of the belt, or load is rapidly fluctuating, a constant-force tensioning device is advisable to be used. The constant-force tensioning is also advisable for belts with polyamide tensile member and if there is considerable variation in humidity but it is NOT recommended for reversing operation under full load (unless the conveyor is equipped with two tensioning devices, one on either side of the driving pulley).
With active, constant-force tensioning systems, belt length changes occurring during operation are compensated automatically. This device is designed and built with the capability to compensate for these operational length changes as well as to take up the belt length for the required initial tension.
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