螺杆式启闭机的结构特点：

1、手电两用启闭机采用螺杆螺旋传动实现对闸门、堰门的启闭。传动螺杆均采用梯形螺纹并设有平面轴承，具有安装维护简单，操作轻巧灵活等特点。 

2、电动启闭机采用正齿轮—蜗杆—蜗轮二级减速，满足转速慢，转矩大的工作状态。

3、行程控制机采用十进计数器原理，控制行程的误差0.5%，转矩保护控制是通过蜗杆产生轴向位移，来达到保护电器的原理。

4、根据环境的要求可分为普通型、户外型、防爆型以满足不同的要求。

5、开度指示采用齿轮传动，精确可靠，并具有开闭信号灯光指示。

Structural features: 1. The flashlight dual-purpose hoist adopts screw drive to open and close the gate and weir gate. The transmission screw adopts trapezoidal thread and has plane bearing, which has the characteristics of simple installation and maintenance, light and flexible operation. 2. Electric hoist adopts two-stage deceleration of spur gear-worm-worm gear to meet the working condition of slow speed and large torque. 3. The principle of decimal counter is adopted in the stroke control machine. The error of the stroke is 0.5%. Torque protection control is based on the principle that the worm generates axial displacement to protect the electrical appliance. 4, according to the requirements of the environment, it can be divided into general, outdoor and explosion proof types to meet different requirements. 5, the opening indication adopts gear transmission, accurate and reliable, and has the indication of opening and closing signal and light.