The QS hoist driven by a screw enables the up and down or rotational movement of the opened and closed parts,which is widely used in various water supply and drainage projects as well as in the opening and closing of gates, weirs and other equipment in water conservancy projects.

QS hoist can be classified as hand disc type, hand-cranked type and hand-electric dual-purpose type; The hand-electric hoist can be divided into the common type and the electromechanical integrated type. The working principle is that the handwheel or motor drives the thrust nut to rotate, and under the action of the trapezoidal thread, the lead screw drives the gate body to move up and down to achieve the purpose of opening and closing.

1. Each thrust nut is equipped with a plain bearing, and the structure is simple and reasonable;

2. Small manual operating force;

3. The drive device is lubricated with oil bath, the gear material is carburized from low alloy steel, the tooth surface hardness is not less than HRC58, the bearing life is not less than 100,000 hours, the oil bath gearbox is sealed under any circumstances and requires no maintenance;

4. The limit of the electric actuator is accurate, highly sensitive, with bidirectional "torque" protection, and the motor is equipped with overload and overheat protection, and can still operate normally when the voltage drops to 90% of the normal voltage.