Screw hoist spiral screw drive, can be controlled by moving up and down hoist (gate, weir gate, gate, etc.) or rotary movement (butterfly valve, rotary weir doors, etc.), in order to achieve the valve or gate opening and closing its agency reasonably compact, hoist force, the whole series, widely used in lifting and adjusting water plants, sewage treatment plants, all kinds of water supply and drainage, water and hydropower projects gate, weir gate, mud valves and other equipment. Can be divided into manual (hand plate, hand) and electric (flashlight dual) form two types of control. Spiral screw drive, can be controlled by moving up and down hoist (gate, weir gate, gate, etc.) or rotary movement (butterfly valve, rotary weir doors, etc.), in order to achieve the valve or gate is opened and closed, its compact body reasonable, open and close force, the whole series, widely used in lifting and adjusting water plants, sewage treatment plants, all kinds of water supply and drainage, water and hydropower projects gate, weir gate, mud valves and other equipment. Can be divided into manual (hand plate, hand) and electric (flashlight dual) form two types of control. Features: 1, flashlight dual hoist using screw screw drive to achieve the gate, weir gate opening and closing. Drive screw are trapezoidal thread and a plane bearing, with the installation and maintenance is simple, lightweight and flexible operating characteristics. 2, electric hoist with positive gear - Worm - worm reducer two meet slow speed, torque working condition. 3, stroke control machine uses decimal counter principle, control error stroke 0.5%, torque control is the axial displacement protection through the worm to achieve protection of electrical principles. 4, according to the requirements of the environment can be divided into ordinary type, outdoor type, explosion-proof to meet different requirements. 5, the opening indication gear transmission, accurate and reliable, and has opening and closing signal lighting instructions