Screw Jacks

NIASA Screw Jacks

NIASA N/W/R Series screw jacks are a combination of a screw with a gearbox. There are three types of configurations that can be adapted to different requirements:

N: The screw moves when the gearbox input shaft (worm shaft end) is activated. It includes a rounded screw protection tube on the back.

W: The screw engages, as in configuration N but with the difference that the back protective tube is square section,

which means it can be an anti-rotating screw.

R: The screw does not move with the driving of the worm shaft, it only turns; it is the corresponding nut that moves along the screw.

In applications that so require, there is a possibility to protect the screw with a bellow (available in different materials), to protect it in the outside environment and make the screw jacks suitable for outdoor operations or environments with a certain atmospheric aggressiveness.

Screw jacks are often the most optimal technical and economical solution for applications that require lineal, precise and safe movement, for transfer and for elevation, mainly for medium-heavy loads and medium-low speeds.

Their main advantages against other systems, such as pneumatic or hydraulic cylinders, are the following:

  • Greater movement and positioning precision.
  • Greater safety, due to their irreversibility in many configurations (ask NIASA) and/or the incorporation of different braking devices.
  • Superior energy efficiency, as their parts offer high/very high performance, especially with the ball screws, low transmission ratios and high speeds
  • Easier and faster assembly, since hydraulic or pneumatic groups are not required, just an electric motor on the unit itself.
  • Greater reliability and duration, and less maintenance, due to the mechanical robustness and construction simplicity.
  • Modular design and the possibility of operating in multiple positions.
  • Easier to obtain synchronised advance movements of several screw jacks, including under different loads.
  • Lower size for the same load capacity.
  • Axial load capacities, from 5 kN up to 500 kN.
  • Advance speeds, depending on the screw pitch and the gearbox, two possible gears are offered depending on the size of the screw jack, from 4:1 to 56:1 .
  • Trapezoidal and ball screws, depending on the performance required, precision of movement and positioning, etc.
  • Fastening accessories and elements, for optimal adaptation to the most varied systems that may be designed.
  • Control and safety systems (mechanical/inductive limit switches, absolute/incremental encoders, etc.).
  • Materials and surface coverings, depending on the environmental conditions in which the unit will be installed.