| 摘要 |
A screw elevator comprises a pair of counterweight guide rails, a pair of deflection wheels, a counterweight frame, a screw, a power unit, a cable, a car and a car guide rail. The power unit, the screw and the counterweight frame are all disposed between the pair of counterweight guide rails. The power unit drives the screw and the counterweight frame to move, and then the movement of the screw will drive the cable to make the car move upwards and downwards along the car guide rail. The cable has one end fixed at a position above the counterweight rails and the other end of the cable is finally fixed at the center of the top of the car after being wound around a traction wheel and straddled over the deflection wheels.
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