Stieber adds releasable device to load sharing backstop range
04 October 2011
Stieber Clutch has expanded its range of load sharing backstops with the introduction of the RSRT releasable backstop. In the event of a blockage, belt jam or overload, the device allows stored energy to be released in a controlled manner, enabling personnel to work on the belt after an incident. The RSRT is a centrifugal lift off sprag type backstop with an integral torque limiter and release-under-load function.
The mechanical release function allows the tension of a jammed belt to be released through an internal hydraulic system. The release is performed using a simple hand pump to actuate the hydraulic cylinder, progressively releasing the backstop. When the oil pressure is released, the backstop is automatically re-set to the original slipping torque.
In order to allow the unit to be released under torque, the complete backstop is able to rotate backwards, from as little as a fraction of a rotation to as much as several rotations.
The RSRT has been developed for use on the high speed or intermediate shaft of the driving machines in multi-drive systems such as on large inclined conveyors, where two or more backstops share the reverse load. By employing load sharing backstops, users can select smaller backstops than would otherwise be required to cover belt jams or conveyor overloads, with the selection based on the actual load and not on the motor stall torque.
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