SNLCompared with worm gear screw elevators, screw elevators are mainly characterized by high efficiency, easy adjustment of reduction ratio, convenient installation and use, small size, light weight, wide range of power sources, noise free functions, high reliability, etc. This series of products has self-locking function, which can accurately control and adjust the lifting or pushing height according to the program. There are various structural forms, and the height can be increased by manufacturing according to user requirements.