The invention relates to a limit switch used in an elevator machine room. The limit switch comprises a positioning frame, a steel cable positioning mechanism, a speed limiting mechanism, a main shaft fixed-point stopping mechanism and a controller, wherein the steel cable positioning mechanism, the speed limiting mechanism, the main shaft fixed-point stopping mechanism and the controller are mounted on the positioning frame; the steel cable positioning mechanism comprises a permanent magnet and a limiting magnetic sensor; the speed limiting mechanism comprises a connecting plate, a core sleeve, a fixed contact, a movable contact, a return spring and a centrifugal rod; the main shaft fixed-point stopping mechanism comprises a permanent magnet and a positioning magnetic sensor; the controller is electrically connected with the steel cable positioning mechanism, the speed limiting mechanism and the main shaft fixed-point stopping mechanism respectively. According to the limit switch, a lifting limit position, maximum rotation speed and fixed-point stopping of a car of an elevator are precisely controlled and positioned in the elevator machine room, thereby further improving the safety and the reliability of the elevator operation in a facilitated mode while improving the degree of automation of the elevator control system.
Limit switch used in elevator machine room
2015-11-04
Patent
Elektronische Ressource
Englisch
IPC: | B66B Aufzüge , ELEVATORS |