The QDA type electric actuator features a fully sealed integrated mechanical and electrical structure, suitable for outdoor use, and utilizes worm gear and worm drive. It is equipped with a stroke limit and torque protection device, with the stroke limit device consisting of a set of counting gears and hard contact limit switches. When the gate is fully opened or closed, the counting gears drive the stroke limit rod, causing the hard contact limit switches to activate, automatically stopping the gate's opening and closing action. If the stroke limit switch does not activate due to some reason, causing an increase in torque, the torque protection switch activates to protect the actuator from unexpected damage. The electric device is also designed with a pointer-type opening indicator and a heating resistor. The pointer-type opening indicator is connected to the counting gears, allowing for a direct indication of the gate's opening position. The heating resistor automatically connects during the operation of the actuator to remove moisture inside, ensuring dryness and reliable operation of all electrical components. The gate nuts are connected to the output end of the electric device using a spline connector, with the splines having gaps to create a hammering effect at the moment of gate opening, achieving the purpose of hammering start, and increasing the pre-force during gate opening and closing. The cast iron bracket is in a closed structure to bear the gravity or counterforce when opening or closing the gate, internally equipped with load-bearing bearings, and has an exquisite appearance. It can be controlled on-site or remotely. Manual and electric automatic switching is available.
★Application: Electric opening and closing machines are widely used in various water supply and drainage projects, as well as in hydraulic and hydroelectric projects. They are primarily used to control the lifting and lowering of various gates, weirs, and valves, thereby achieving the opening and closing of gates or valves. Generally, they are divided into manual and electric control types. When the width-to-height ratio of the gate or valve is large, a double-hoist opening and closing machine is required.
★Specific models of QDA/S dual-purpose flashlight switch-off machine include:
Ⅰ: Single Hoist QDA-20, QDA-45, QDA-60, QDA-90, QDA-120, QDA-180, QDA-250
II: Double suspension QDS-2x3, QDS-2x5, QDS-2x8, QDS-2x10, QDS-2x12, QDS-2x15, QDS-20, QDS-2x25, QDS-45, QDS-90, QDS-180, QDS-250