How Does Lifting Screw Work? Apr 21 , 2018

As we all know, the worm gear screw actuator is a basis jack-up part, accomplish the functions such as lifting, drop, push and inverting through worm gear drives screw. But how does the lifting screw work? Let's see the following.

translating lifting screw jack

When a Worm screw actuator unit is operated, the rotation of the worm shaft causes the worm gear to rotate. The worm gear is threaded to accommodate the lifting screw thread; as the worm gear turns,the friction forces on the screw thread act to turn the screw also. The greater the load on

the Worm screw actuator, the greater the tendency of the screw to turn. It is obvious that if the screw turns with the nut(worm gear), it will not raise the load. In those cases where a single unit is used,

and where the load cannot be restrained from turning,it is necessary to key the lifting screw.

By the way,when the worm screw actuator is used in environment where there is dust, dirt, moisture and corrosive contaminants, bellows boot can be selected to protect the lifting screw. When acme screw jack is selected, the keyed lifting screw is also available to prevent rotation when needed.

Learn more about  screw jack at

machine screw jack with bellows boot

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