Although the other part is the introduction of various types of elevators in various countries where technology is produced or imported, most of the use units cannot obtain spare parts for the same type of imported elevators. When a failure occurs, it will require a large amount of funds to repair or purchase. Supporting components and components will eventually make the elevator run in a sick state, and there are safety and fault hidden troubles. For example, two British ladders in a building in Guangzhou were deactivated due to component damage, and one was running sick. In addition to the accidents in the work of installation and maintenance personnel, the types of accidents that occur with elevators are basically the three types: (1) The passengers are injured or killed by the elevators when they are pushed or dropped (have few) (2) Accidents of falling wells; (3) Accidents caused by door-to-door walking and escalators. In a word, these accidents are directly related...