a jack screw

a jack screw


A jack screw, also known as a machine screw jack, is a mechanical device used to convert rotational motion into linear motion. It consists of a threaded screw shaft and a nut that moves along the screw. The screw shaft is rotated using a hand crank or a motor, causing the nut to move linearly. This mechanism is commonly used in various applications where heavy loads need to be lifted or moved vertically.

1. What is a screw jack used for?

Screw jacks have a wide range of applications. Here are some common uses:

  • 1.1 Lifting and leveling heavy machinery in industrial settings.
  • 1.2 Adjusting the height of platforms, stages, or workbenches.
  • 1.3 Positioning solar panels to maximize sunlight exposure.
  • 1.4 Opening and closing large doors or gates.
  • 1.5 Stabilizing structures such as scaffolding or temporary supports.
  • 1.6 Raising and lowering vehicles or heavy equipment for maintenance.

screw jack

2. What is the working principle of screw jack?

The working principle of a screw jack is based on the concept of a simple machine called an inclined plane. When the screw shaft is rotated, the inclined plane formed by the thread of the screw and the nut converts the rotational motion into linear motion. As the screw rotates, the nut moves along the screw, causing the load to be lifted or lowered. The pitch of the screw (the distance between adjacent threads) determines the amount of linear motion per revolution of the screw.

screw jack

3. What is the difference between a screw jack and a hydraulic jack?

Although both screw jacks and hydraulic jacks are used for lifting heavy loads, they operate on different principles:

  • 3.1 Screw jacks use mechanical advantage and the rotation of a screw to lift loads, while hydraulic jacks use the principle of Pascal’s law and fluid pressure to lift loads.
  • 3.2 Screw jacks have a slower lifting speed compared to hydraulic jacks.
  • 3.3 Screw jacks can support heavy loads for extended periods without the need for additional support, whereas hydraulic jacks may require additional support to prevent sudden failure.
  • 3.4 Screw jacks are generally more compact and easier to install, while hydraulic jacks require a hydraulic system for operation.
  • 3.5 Screw jacks are more suitable for applications where precise position control is required, while hydraulic jacks are often used in applications where rapid lifting is necessary.

4. How to choose or customize the right screw jack?

Choosing the right screw jack for your application requires considering several parameters and practical conditions. Here are some factors to consider:

  • 4.1 Load capacity: Determine the maximum weight the screw jack needs to lift or support.
  • 4.2 Travel distance: Calculate the required linear motion or height adjustment range.
  • 4.3 Speed and efficiency: Evaluate the desired lifting speed and the efficiency of the screw jack.
  • 4.4 Environmental conditions: Consider factors such as temperature, humidity, and exposure to corrosive substances.
  • 4.5 Mounting and integration: Assess the available space, mounting options, and compatibility with other components or systems.

screw jack

Our Products and Company Advantages

As a leading manufacturer of industrial motors, gearboxes, and drivers in China, HZPT is dedicated to technological innovation and excellent quality. Our product range includes:

  • 1. Micro gear motors
  • 2. Medium-sized gear motors
  • 3. Brake adjustable-speed motors
  • 4. Torque motors
  • 5. DC motors

Here are some advantages of our products and company:

  • 1. Comprehensive product range to meet diverse industrial needs.
  • 2. High-quality materials and precise manufacturing processes ensure reliability and durability.
  • 3. Advanced technology and design for optimal performance and efficiency.
  • 4. Flexible customization options to meet specific requirements.
  • 5. Extensive industry experience and expertise to provide excellent customer support and service.

Find us

Ep Screw Jack Co., Ltd.

Mail: [email protected]

As one of leading manufacturers, suppliers and exporters of mechanical products in China, We offer reducers, sprockets, industrial and conveyor chain, belts, pulleys, gears, racks, gearboxes, motors, PTO Shafts, taper lock Bushing, vacuum Pumps, screw air compressors and many other products. Please contact us for details.