Fall accidents are a common type of accident, often accounting for a large proportion of various production safety accidents that occur.

At present, common fall prevention equipment includes Self-retracting, self-locking devices, safety belts, fall arrest nets, etc. Compared to other categories of personal protective equipment, fall protection equipment has a lower level of attention, and speed difference controllers are a subdivision of fall protection equipment. So, for a long period of time, the speed difference self-control device was not given enough attention by the relevant parties.