The NYD/ND/NJ type reverse stopper is a contact-type anti-reversal device suitable for low-speed applications. It boasts advantages such as light weight, compact structure, reliable reverse stop, easy release, convenient installation, and strong adaptability. It serves as a safety protection device for lifting equipment, commonly used with belt conveyors, bucket elevators, scraper conveyors, and other equipment requiring reverse stop functionality.

Note:
1. Hole tolerance is H7, recommended shaft tolerance is h6; the installation hole keyway dimensions are selected according to GB/T1095-1979, with width deviation using general key connection, shaft as N9, hub as JS9.
2. "NJ" is the model of the fourth edition of the "Mechanical Design Handbook" published by Chemical Industry Press.