Worm Gear electric ball screw 
jack, anti-Rotation and higher pitches available
Translating(traveling screw) and rotating (traveling nut) configurations
Move loads and apply force more efficiently than other machine screw actuators
No self-locking! Because of the lack of friction, a Worm Gear Jack keeping brake is necessary: a motor brake or a spring pressure brake is required.
These worm gear screw jacks are very precision and reliability, it can meet all of the necessary safety, cost-efficiency, and durability mandates of the application. High power bronze worm gear is used, the payloads from 0.5T to 100T . A complete of 11 sizes can be found, each in a traveling nut version and a simple version.
The screw jacks can be utilized separately or in groups connected with drive shafts, joints, couplings, bevel gearboxes and additional mechanical components. In addition they can be powered by different motors: electrical, with either AC electric motor or DC motor along with hydraulic or pneumatic motors. All these motion control products can be built-in many type jacking program arrangements or configurations.
Ball screw jacks are normal where higher speeds and duty cycles are needed. Most screw jacks use trapezoidal screws Tr, because they’re basic, robust and inexpensive. The proportion of screw jacks that use ball screws is nevertheless constantly increasing. The reason why for this are primarily their pitch accuracy, their high efficiency (less power consumption and less heat generation) and the higher pitches offered, which permit higher stroke speeds.
A screw jack can add a machine cut lifting nut. Because of this model screw jack, just the bronze nut move together with the screw shaft. The lifting screw does not slide. It is definitely like the linear actuator operating principle which converts rotational movement into linear motion. From this point to understand, a power linear actuator is definitely a motorized screw jack.
The screw thread of screw jack could be acme screw and ball screw. So there are few variations of the screw jack. Commonly, machine screw jack and ball screw jack are available in your engineer project. Compared with acme screw, the ball screw is usually more efficient as there are ball bearings between the nut and screw. The anti-friction ball bearing can increase the ball screw efficiency.