Elevator doors are two layers. Layer of the inner edge of the door is installed in the cab, generally called car door. Door switch mechanical device drivers installed on the car roof car door. Outer layer of the door is installed in each of the elevator shaft entrance, commonly known as landing doors (or landing door), and its opening and closing the car door led. Layer gate usually a spring (or weights) in the closed state to prevent people from falling into the well. Multiple cables, hanging in the cab at the top of the lift shaft sheave room above. The other end of rope hanging counterweight for balancing. Counterweight generally cab plus 50% load weight. When the elevator car moves, the counterweight will move in the opposite direction. Rope sheave is to rely on a rough surface and lead grooved wheel to pull the friction between the box sedan. So when the old cable or sheave, you must timely replacement to prevent slippery. Responsible for driving the traction motor wheel rotation, raising or lowering powered cabs. The motor is communication, there may be DC. To use some motor gear driven sheave, the newer and faster lifts generally be applied gearless drive. There are some high-level traction lifts weight compensation: a small lift in the cab and under the counterweight has a cable or chain connected to the ground. Is to compensate elevator car or counterweight hanging a rope length of the weight change caused by the change. Traction lifts must have a variety of safety devices to prevent the cab due to cable breakage, Zhidongshiling any cause degeneration. Minimum safety devices include: cable speed limiter installed in the engine room, the elevator car and the counterweight to install safety gear. Safety gear when Otis invented the mechanical safety device, when accelerated to a certain speed will automatically clamping rail, the cab or counterweight braking. In the bottom of the elevator shaft, but also equipped with a buffer, as a last resort to protect. Sales Tel 0531 -81,170,991 0531-81170992 0531-81170993 Address: Jinan Jiyang County Road 888, through a strong industrial park · free :400 -0531-267 Website: http://www.qiangliyy.cn/