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For various types of large-scale water supply and drainage, water conservancy and hydropower projects. Is used to control various types of large and medium-sized iron and steel gates of the lift gate to achieve the purpose of opening and closing. <br> <br>  <br>By type divided into: <br> <br>  <br>Hydraulic hoist, winch hoist, gantry crane, hand wheel hoist, hand hoist, screw-type hoisting machines. <br> <br>  <br>Structural features: <br> <br>  <br>1, hoisting machines, including motor, hoist, rack, protective cover etc.; using three slow way, with the country to pay rotating drive, the output torque greater. Hoist supporting steel frame construction to overcome the unevenness in order to reduce machine noise and vibration. <br> <br>  <br>2, using outdoor-based system of long-time motor, protection grade ≥ IP155. Stroke control mechanism of the metric theory counter to control the stroke of error 0.5%. Protection and Control torque generated by the axial displacement of worm touch micro switch, to achieve the protection of electrical principles. <br> <br>  <br>3, operation and maintenance is simple, can be realized on-site and remote control operation.