What Is Screw Jack - What Is Worm Gear Screw Jack - How Does A Screw Jack Work - Screw Jack Working Principle - How Screw Jack Works - What Is Mechanical Screw Jack

What is screw jack? what is worm gear screw jack? how does a screw jack work? screw jack working principle? how screw jack works? what is mechanical screw jack? A Screw Jack (also known as a Worm Gear Screw Jack, a Machine Screw Jack or a Ball Screw Jack) is a devise used to convert rotational motion into linear motion. They can be used to push, pull, tension, lock, unlock, tilt, pivot, roll, slide and lift or lower loads, anything from a few kilos to thousands of tonnes. Additionally, screw jacks are increasingly finding uses as alternatives to conventionally pneumatic and hydraulic systems. 


The trend to electromechanical actuation from hydraulic actuation. Screw jacks usually operate in high-load applications. The competing technology at high loads tends to be hydraulics; however, hydraulics are less energy-efficient than electro-mechanical actuation provided by screw jacks. Hydraulic systems waste energy as the fluid circulates at constant pressure, regardless of the amount of work required to be carried out by hydraulic positioning. A hydraulic jack or ram requires a constant pressure to maintain its position when holding a load in place. By contrast, an electric motor used to power a screw jack uses energy only when it drives the load to a required position. What's the mechanical advantage of screw jack compared with hydraulic systems? Reduced cost since no need ancillary hydraulic equipment, no hydraulic oil to maintain, no leaks to repair. Environmentally Friendly since no high-pressure oil leaks. Increased Safety. In the event of power loss, screw jacks can be self-locking. More quicker and simple to install, program and tune. Better energy efficiency. Greater levels of precision. 

Screw jack is used in applications where linear motion is required. Lifting of any load, pushing or pulling of mechanical equipment, adjusting of tight clearances of mechanical parts can be done by screw jacks, for example: Large dish antenna movement (Top, Center, Bottom), Workplace table adjustments, Drive wheel adjustment to change conveyor flow stops, Conveyor lifts, diverters, Knife blade filter drum skimmer, Furnace combustion gun adjustment, Mechanical clutch linkage, Vacuum furnace lid lifters, Roll lifts, Mandrel pushers Sluice gates. Mechanical capacity of screw jacks is between 1/4-tonnes and 100-tonnes. Jack screws can be used as linear motors, linear actuators, or mechanical lifts depending on type of motion. Screw jacks are essential components in automated machinery. Safety and legislative concerns drive the automation of handling and lifting of heavy loads, particularly in regions which have developed workplace and health and safety legislation. 

There are a few Screw Jack Design available including Translating, Keyed and Traveling Nut. All of them can be achieved with either a machine screw jack or ball screw jack. Do you want to find the correct jacks design for your application?
1. Translating screw Jacks are most often selected. The main components of screw jacks are gear housing, trapezoidal lifting screw, worm screw and worm gear. Worm screw is rotated manually or by motor, then the worm gear will be rotated by the worm screw and the lifting screw moves through the rotating worm gear. The linear motion speed of lifting screw depends on thread size and rotation ratio of worm gears.
2. Traveling Nut screw Jacks are another option. The lifting screw does not move up and down. It only rotates around its axis. The travelling nut moves along the screw. The lifting nut of screw jack is made of bronze to decrease friction. This type of jack is ideal for space limit applications that cannot accommodate a screw protection tube or that require a flush mount.
3. Keyed screw Jacks(also known as anti-rotation screw jack) are used any time rotation of the lifting screw is not restrained. For instance, when you must lift the jack to meet a load. This is how they work: A key, fixed to the jack housing and inserted into a keyway milled into the length of the lifting screw forces the lifting screw to translate without rotating. It is available in translating models.