Full definition
Mechanical device that prevents belt reversal on inclined conveyors when the motor stops or fails, keeping the loaded belt stationary and preventing material from sliding backward. Types: ratchet, sprag clutch (rollers), centrifugal backstop. Installed on the drive pulley shaft or in the gearbox. Selection based on calculated holdback torque considering material weight on the loaded strand, conveyor length, and inclination angle. Reference standard: ISO 9588.