scissor lift screw drive

Scissor Lift Screw Drive


A scissor lift screw drive is a type of lifting mechanism commonly used in various industrial applications. It consists of a set of crossed metal supports, known as a scissor mechanism, which is connected to a threaded screw drive. This combination allows for vertical motion and lifting capabilities. In this article, we will explore the functionality, working principle, and differences between a screw jack and a hydraulic jack. We will also discuss how to choose or customize the right screw jack for specific requirements.

screw jack

What is a screw jack used for?

1. Industrial Lifting and Positioning

Screw jacks are widely used for lifting heavy loads in industrial settings. They provide precise vertical motion and can be used to raise or lower platforms, machinery, or other equipment to a desired height.

2. Load Handling and Support

In addition to lifting, screw jacks are used to handle and support heavy loads. They can provide stability, prevent excessive vibrations, and ensure safe load distribution in various applications.

3. Height Adjustment and Leveling

Screw jacks are commonly employed for height adjustment and leveling purposes. They can be used to fine-tune the height of workbenches, platforms, or other structures to create a level surface or ensure proper alignment.

4. Mechanical Actuation

Screw jacks are also utilized as mechanical actuators in different systems and machinery. They can convert rotational motion into linear motion, enabling precise control and movement in various automated processes.

5. Energy Storage and Emergency Backup

Screw jacks can serve as energy storage devices, especially in applications where sudden power loss or emergencies occur. The threaded screw drive mechanism allows for controlled lowering of loads, ensuring safety and preventing damage.

screw jack

What is the working principle of screw jack?

1. Screw Drive Mechanism

The working principle of a screw jack is based on the screw drive mechanism. This mechanism consists of a threaded screw and a nut or worm gear that engages with the screw. When the screw is rotated, the nut or worm gear moves along the screw, resulting in linear motion.

2. Mechanical Advantage

Screw jacks utilize the principle of mechanical advantage to lift heavy loads with less input force. The thread pitch of the screw and the size of the nut or worm gear determine the mechanical advantage achieved. This allows for efficient lifting and load handling capabilities.

3. Self-Locking Capability

A key feature of screw jacks is their self-locking capability. This means that once the desired position is reached, the screw jack will remain in place without the need for continuous power or additional locking mechanisms. This ensures stability and prevents accidental lowering of the load.

4. Rotational to Linear Motion Conversion

By converting rotational motion into linear motion, screw jacks provide precise control over vertical displacement. The screw can be rotated manually or using an electric motor, allowing for easy and accurate height adjustments or load positioning.

5. Load Distribution and Safety

Screw jacks are designed to distribute loads evenly and ensure safe lifting operations. The mechanical components, such as the scissor mechanism and load-bearing elements, are engineered to handle different load capacities and maintain stability throughout the lifting process.

screw jack

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

While both screw jacks and hydraulic jacks are used for lifting and load handling, they operate on different principles and offer unique advantages:

Screw Jack

– Operates based on the screw drive mechanism.

– Provides precise control and positioning capabilities.

– Offers self-locking capability for load stability.

– Suitable for heavy loads and applications requiring fine adjustments.

– Requires manual or motorized rotational input for operation.

Hydraulic Jack

– Utilizes hydraulic fluid and pressure to lift loads.

– Provides high lifting capacities and rapid lifting speed.

– Requires hydraulic power source for operation.

– Offers smooth and continuous lifting motion.

– Suitable for applications requiring quick and powerful lifting.

Choosing or Customizing the Right Screw Jack

1. Load Capacity

The load capacity of the screw jack should match or exceed the maximum weight of the load it will be lifting or supporting. Consider the dynamic and static load requirements to ensure safe and efficient operation.

2. Lifting Speed and Travel Distance

Determine the required lifting speed and the vertical travel distance needed. Screw jacks can be customized with different screw pitches and gear ratios to achieve the desired lifting speed and travel range.

3. Environmental Factors

Consider the environmental conditions in which the screw jack will be operating. Factors such as temperature, humidity, dust, and corrosive substances may require specific material coatings or sealing options to ensure durability and performance.

4. Mounting and Integration

Evaluate the available space and mounting options for the screw jack. Consider the compatibility with existing systems or machinery to ensure proper integration and ease of installation.

5. Safety Features and Accessories

Check for additional safety features and accessories that may be required for specific applications. These may include limit switches, emergency stop buttons, protective covers, or remote control options to enhance safety and convenience.

screw jack

As a leading manufacturer of industrial drive products, including screw jacks, HZPT is committed to delivering innovative technology and excellent quality. Our product range includes a variety of gear motors, reducers, drives, and specialized screw jacks. With our extensive experience and expertise, we provide reliable solutions for various industries such as transportation, food processing, medical equipment, printing, textile, packaging, and more.

Why choose HZPT screw jacks?

1. High Load Capacity

Our screw jacks are designed and manufactured to handle heavy loads with ease, ensuring optimal performance and safety.

2. Precise Positioning

With precise control and positioning capabilities, our screw jacks enable accurate height adjustments and load handling.

3. Durable and Reliable

Our screw jacks are built to withstand demanding industrial environments, featuring robust construction and high-quality materials.

4. Customization Options

We offer a range of customization options to meet specific requirements, including load capacity, lifting speed, mounting options, and more.

5. Comprehensive Support

Our team of experts provides comprehensive support, from product selection to installation and after-sales service, ensuring a seamless experience for our customers.


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.