适用于户外工作，采用蜗轮蜗杆传动。内设行程限位和扭矩保护装置，行程限位装置由一组计数齿轮和硬触点限位开关构成，当闸门开或关到位时，计数齿轮带动行程限位杆，使硬触点限位开关工作，自动停止闸门开、关动作，当由于某种原因行程限位开关未动作引起扭矩增大时，扭矩保护开关动作，保护启闭装置不受意外损伤。电动装置上另设计指针式开度指示器、加热电阻。指针式开度指示器与计数齿轮相连，能够直观地反应出闸门所处的开度位置，加热电阻在启闭机工作时自动接通，用以去除电动装置内的潮气，确保内部干燥，保证各电器元件的工作可靠。启闭螺母与电动装置输出端采用牙嵌式连接器，牙嵌式连接器的卡爪留有间隙，使闸门开启时的瞬间产生捶击作用。
Suitable for outdoor work, using worm gear and worm drive. Installed with travel limit and torque protection device, the travel limit device consists of a set of counting gears and hard contact limit switches. When the gate is opened or closed in place, the counting gear drives the travel limit rod to make the hard contact limit switch work, automatically stops the gate opening and closing, and when for some reason the travel limit switch does not operate. When the torque increases, the torque protection switch acts to protect the hoisting device from accidental damage. The pointer type opening indicator and heating resistance are also designed on the electric device. The pointer type opening indicator is connected with the counting gear, which can intuitively reflect the opening position of the gate. The heating resistance is automatically connected when the hoist works to remove the moisture in the electric device, ensure the internal drying and ensure the reliability of the electrical components. The opening and closing nut and the output end of the electric device adopt the dental socket connector, and the claw of the dental socket connector has clearance, which makes the thumping effect occur instantly when the gate is opened.