What is a SCREW JACK?

What is a SCREW JACK?

A screw jack, also sometimes referred to as a jackscrew, is a mechanical transmission equipment used to translate rotational motion into linear motion in various applications including industrial applications. Screw jacks are an essential component in automated machinery because of their high reliability and synchronization. Jackcrews can typically handle different weights depending on the application requirements.

Screw Jack components

A screw jack is made up of different parts. It is an assembly of a gearbox and a transmission component. Jackscres consist of four fundamental components namely:

  • Trapezoidal lifting screw (lead screw).
  • Worm screw (Worm).
  • Worm gear.
  • Gear housing.

Screw Jack Working Principle

The main components of a screw jack play a fundamental role in how it works. The lead screw travels upwards or downwards linearly as the worm gear rotates. The worm screw rotation can be done manually or can be operated using a motor (especially for heavy-duty screw jacks). When the worm screw starts rotating because of an externally introduced torque, its teeth pressed against the teeth of a worm gear causes the worm gear to rotate as well, thereby, initiating the lead screw’s upward or downward motion. The number of gear teeth, the screw pitch size and the turning speed determine the screw feed rate.

Screw Jack Advantages

Screw jacks can be used to lift and load, pull or push mechanical equipment as well as modify tight clearances between objects. They may have a mechanical capacity ranging from 5kN to 2000kN. Some of jackscrews advantages include the following:

  • Better levels of precision.
  • Self-locking thereby increasing safety.
  • Easy to install with minimum maintenance.
  • Cost-effective.
  • Better energy efficiency.

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