The jackscrew, also called a screw jack, is a jack operated by turning the leadscrew. It is used for lifting different loads, like moderate-level and heavy loads, like vehicles.
It is also used for raising and lowering horizontal aircraft stabilizers and variable support for heavyweight loads like house foundations. In this post, we will detail features for Jacscrew and related factors. Let’s get started.
What is Screw Jack?
- The screw jack has a heavy-duty screw vertically designed and a load table on top that screws into a threaded hole in the static frame and has a larger base area that lies on the ground.
- The rotating roller on the screw head has holes where the handle and metallic bar are connected.
- When we turned the handle in a clockwise direction, the screw moved out of the base and laid the load on the load table.
- For supporting larger load forces, screws made with Acme threads.
- Screw jacks also come in subtypes like translation and reciprocating.
- A translating screw jack used for moving the lift shaft or screw in the worm gearbox, and rotating the screw jack provides static lift shaft, and lifting nuts move over it
Parts of Screw Jack
There are many parts of the screw jack that are listed here.
Screw
- • The screw is the main part of the jackscrew and threaded rod. When it rotated, it converted rotational motion into linear motion. In this way we lift loads.
 Mounting Plate
- This part provides support for the jackscrew. It is fixed on the ground, which helps the jackscrew to lift and lower loads easily.
Load Platform
- It is the part where the load is connected. It has different designs, like a platform. It holds loads during lifting or lowering operations.
Housing
- the main use of housing to protect internal parts of the jackscrew from the external environment. It prevents dust particles from entering the system and is used as a safety part for moving components.
Nut
- A nut is a threaded part that configures with the threads of a screw. When the screw rotates, the nut moves over lengths and provides linear motion for the load.
Handle
- The handle is the part that helps to apply force on the screw, which rotates it. It is manually operated and operates with a motor according to the jack screw design.
Safety system
- Safety systems provide safe working features for jackscrew working. that control switching for minimizing emergency stop buttons and overextension. It also maintains the load position if the power is cut off.
- Safety systems are important for working with jackscrews to avoid any damage.
Screw Jacks types
basic types of jackscrew areas
Translating Screw Jack
- In type, worm wheel rotations occur on the lead screw, which provide linear movement. If the end of the lead screw is not accurately connected, the lead screw moves due to friction between the screw threads.
Keyed Screw Jack
- As compared to the previous screw, the lead screw provides rotation to avoid turning. It is important to use it when the lead screw is not connected with the load.
- The applications that have different screwjack connections with mutual loads, where encrypted and non-encrypted transmission screws are used
Rotating Screw Jack
- This type comes with a lead screw connected with a worm wheel that provides rotation of the worm wheel to provide rotation of the lead screw.
- In a result, move the nut with the lead screw during the nut connection with the load.
Worm Gear Screw
- The other name of this type is worm screw, which comes with a threaded screw known as a worm and a toothed wheel.
- The worm comes with a helical thread that configures with gear teeth, providing rotational movement of the worm for gear rotation.
- This type of screw jack is used for providing minimal speed and high torque, so it is used in the vehicle industry, machines, and conveyors.
- They prefer it since it is a strongly fixed component, and the self-locking feature, since it has high friction between worm and gear teeth, avoids back driving.
Ball Screw Jack
- ballscrew Jack uses a ball screw system for converting rotary motion into linear motion, which helps to get effective vertical or horizontal lift for high loads.
- It comes with a threaded screw shaft having ball bearings in a proper casing.
- Due to screw rotation, ball bearings move over the screw’s helical groove, converting rotational motion into linear motion.
- This module has high efficiency, low friction, and high accuracy.
- It is used in vehicles and the manufacturing industry and provides reliable high-load lifts.
Advantages of Jackscrew
- Â The main jackscrew is self-locking; that shows when the rotating force on the screw is removed, it remains motionless at the required position.
- So it is safe compared to a hydraulic jack, which moves in reverse in case of load when the force on the hydraulic actuator is released.
Limitations
- screw Jack has limited capacity for lifting purposes. with an increase in load causing high friction in screw threads. The fine-pitch thread that makes it efficient to screw also minimizes the speed of the jack.
- The use of a longer lever becomes such a structure that the lever bends internally.
- A screw jack is used in place of hydraulic jacks.
Applications of screw jacks
- A jackscrew is commonly used for electrical and electronic devices and is part of different components. These screws also make part of the design with different connectors, since they make a strong connection between the electrical device and the cable.