The Resreach And Design On The Detection And Protection Of Means To Against Unintended Lift Car Movement

With the increasing of the high-rise building, the role of the lift played in the life is more and more important, and its security is being paid attended by people increasingly.The unintended car movement easily to make the accident like shear, extrusion, such accidents directly affect the life and property security,.Therefore,it is very important to monitor the running of the car for detecting unintended car movement and dopt protective measure timely by manipulating safety devices.This paper, taking the lift car unintended movement detection and protective means design as the object, analyzed the causes of the unintended car movement, and introduce overall design of device, hardware selection, design and software design. Directly read car running state by non-contact parts to avoid the wire rope, rotary encoder feeding back fool signal such as possible unreliable risk.Without the intervention of the state detection method avoids issues of responsibility of lifts control circuit changes,and what make the design can be applied to different manufacturers, different types of lifes, provides a technical solution for existing lifts safety renovation.The design models of Siemens S7-200 Programmable Logic Controller as the controller, store data, analysis of the collected information, and judge running state, drive actuators to take safety precautions. With Free-port Communication, LDM301 wide-range laser displacement sensor connect directly measuring the speed of the car running, the position in well.It can analysis the elevator control contactor auxiliary contact instructions of elevator running, and judge whether there was a layer of elevator door, the car door by artificial seal risk and whether capsules in a car move state. Timely when the unexpected move to cut off the elevator host drive circuit, wire rope brake to grip the tractive rope way to stop the car running, send rescue workers to dangerous alarm messages, and passengers inside the capsules are calm and alert.