Both Screw jack and servo electric cylinder can realize the mechanical movement into linear or straight push/pull movements. They are ideal for all types of applications where tilting, lifting, pulling or pushing with pounds of force are required.

In comparison, due to the servo motor and servo electric cylinder screw jack combination makes the servo electric cylinder of thrust, speed and position control is more precise and therefore is widely used in modern digital and network technology, and other fields, which can realize programmed control, so the cost is higher.

There are two types of basic transmission forms of screw jacks.

1.Nut Movement

In Brief: When the worm shaft is rotated the lead screw rotates in the body of the screw jack at the same rate as the worm gear. The nut on the lead screw moves in a linear direction along the screw when fixed to a structure that prevents it from rotating with the screw. This design is also available with a “Safety Nut”.

In Detail: When a screw jack unit is operated, the rotation of the worm shaft causes the worm gear to rotate. For rotating screw jacks the lead screw is fixed to the worm gear and they rotate at the same speed. As the worm gear turns, the friction forces on the screw thread act to turn the nut also. The greater the load on the screw jack unit, the greater the tendency of the nut to turn. It is obvious that if the nut turns with the screw, it will not raise the load. Therefore the nut needs to be fixed to a structure to prevent rotation.

2.Screw Movement

In Brief: The lead screw translates through the body of the screw jack when the lead screw is prevented from rotating with the worm gear. This is typically done by fixing the end of the lead screw to the structure that needs to be moved linearly.

In Detail: When a screw jack unit is operated, the rotation of the worm shaft causes the worm gear to rotate. For translating screw jacks the worm gear is threaded to accommodate the lead 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 screw jack unit, 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 screw jack with an anti-rotation mechanism (keyed screw jack).

What should you pay attention to when using the screw jack? This is also crucial for us who often use jacks .It enables us to better understand the screw jacks, thus reducing unnecessary troubles during use.

The specific precautions for the screw jack are as follows:

Firstly, always keep the surface of the screw jack clean, regularly check whether the internal structure is intact, make the pinion in the rocker flexible and reliable, and lift the lifting sleeve freely.

Secondly, the friction surface between the lifting sleeve and the housing must be oiled at any time. Other oil filling holes should be lubricated regularly.

Thirdly, in order to take into account the safety in use, the jack should not be overloaded, work with illness, it is not appropriate to use more than one to avoid danger.

Fourthly, The screw jack must be checked regularly, depending on the level of use and the working environment. It is advisable to check if there is a lubricant leak in the housing. If this happens, you need to find and remove the cause and fill the lubricant with the correct level.The lubrication conditions of the threaded spindle must be checked regularly (if necessary, recovery must be made) and the presence of any foreign matter. Safety components must be inspected according to applicable specifications.