螺杆式启闭机的原理

The principle of screw type hoist

螺杆螺帽机构中，螺帽旋转时，同时沿螺杆轴线移动，将螺纹展开，可以看出实际上螺帽等于在沿螺纹展开的斜面上运动，利用斜面，螺帽旋动增加了运动的距离但节省了轴向运动所需要的力量，这就是螺旋千斤顶的工作原理； 

In the screw nut mechanism, when the nut rotates, it moves along the axis of the screw and expands the thread. It can be seen that the nut is actually moving on the inclined plane which is unfolded along the thread. Using the inclined plane, the spiral cap swirl increases the distance of the motion but saves the strength required for the axial motion. This is the working principle of the screw jack. ;

螺杆启闭机也就相当于一个螺旋千斤顶，通过力臂较长的手柄转动力臂较短的螺帽，使螺帽得到较大的转动力量，当螺帽上下位置被固定后，使不能旋转的丝杆（螺杆）沿螺纹对应的斜面产生一个大的轴向分力，从而带动沉重的阀上升或下降，完成启闭工作

The screw hoist is also equivalent to a screw jack. By turning a shorter screw cap with a long arm of the arm, the screw cap gets a larger rotating force. When the top and lower position of the nut is fixed, the screw rod (screw) cannot be rotated to produce a large axial force along the opposite side of the thread, thus driving the heavy weight. The valve is up or down to complete the opening and closing.