The QDA type electric actuator features a fully sealed mechanical and electrical integration structure, suitable for outdoor use, and employs worm gear and worm transmission. It is equipped with stroke limit and torque protection devices. The stroke limit device consists 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 opening and closing action of the gate. If the torque increases due to a failure in the stroke limit switch for any reason, the torque protection switch activates, protecting 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 nut is connected to the output end of the electric device using a ratchet connector, with the ratchet claws leaving a gap to create a hammering effect when the gate opens, achieving the purpose of hammering start, and increasing the pre-force during the opening and closing of the gate. The cast iron bracket has a closed structure to bear the gravity or counterforce during the gate operation, internally fitted with bearing supports, and has an exquisite appearance. It can be controlled on-site or remotely, with manual and electric automatic switching.
★Application: Electric actuators for opening and closing are widely used in various water supply and drainage projects, as well as in water conservancy and hydropower projects. They are primarily used to control the lifting and lowering of various gates, weir gates, 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 machines include:
Ⅰ: Single-Hung QDA-20, QDA-45, QDA-60, QDA-90, QDA-120, QDA-180, QDA-250
Ⅱ: Double suspension models - QDS-2x3, QDS-2x5, QDS-2x8, QDS-2x10, QDS-2x12, QDS-2x15, QDS-20, QDS-2x25, QDS-45, QDS-90, QDS-180, QDS-250