Application Research on the Measurement of Unintended Car Movement Protection

By the end of 2021, the elevators retention in our country has exceeded 8.7 million, which still maintains a steady growth of more than 10% after 2019, but the elevator injury accidents have not reduced in recent years under such circumstances of the manufacturing technology and maintenance. Most of the injury accidents result from the unintended car movement given rise to the failure of door system and breaks which causes shear and squeeze injury in the landing zone according to the statistics, so it is significant to stop the car within safe area by the unintended car movement protection system (UCMP) to prevent the accidents from happening. In this paper, the operating principle of breaking system of UCMP is simply analyzed, and the measuring method of stopping distance of the breaking subsystem is discussed.