manual worm gear screw jack

Manual Worm Gear Screw Jack: A Comprehensive Guide

screw jack


A manual worm gear screw jack is a mechanical device used in various industries for lifting, lowering, and positioning heavy loads. It consists of a worm gear mechanism, a lifting screw, and a load-supporting platform. This article will delve into the working principle, applications, and selection criteria for screw jacks.

What is a screw jack used for?

screw jack

1. Industrial Machinery

Screw jacks are widely used in industrial machinery for lifting and positioning heavy equipment during manufacturing processes. They provide precise and stable motion control, ensuring efficient production.

2. Material Handling

In material handling applications, screw jacks are employed to lift and move heavy loads, such as conveyor systems, assembly lines, and automated storage solutions. Their robust construction and high load capacity make them ideal for these tasks.

3. Construction and Infrastructure

Within the construction and infrastructure sectors, screw jacks find application in tasks like bridge construction, foundation repair, and structural adjustment. They enable controlled and accurate lifting, ensuring safety and stability during these critical operations.

4. Entertainment and Stage Systems

Screw jacks play a vital role in entertainment and stage systems. They are used to raise and lower stage platforms, move lighting rigs, and adjust set pieces. Their smooth and precise operation guarantees seamless performances and enhances the overall experience for audiences.

5. Automotive and Aerospace

Automotive and aerospace industries utilize screw jacks for various purposes, including vehicle assembly, maintenance, and component positioning. Screw jacks provide the necessary force and precision required in these demanding applications.

What is the working principle of screw jack?

screw jack

1. Screw and Nut Mechanism

The working principle of a screw jack revolves around the screw and nut mechanism. The screw, also known as the lead screw, is rotated using a worm gear. As the worm gear rotates, it engages with the threads on the screw, causing linear motion along the screw’s axis.

2. Mechanical Advantage

Screw jacks utilize the principle of mechanical advantage to amplify the input force applied to the worm gear. The thread pitch of the screw and the size of the worm gear determine the mechanical advantage, allowing the screw jack to lift heavy loads with ease.

3. Self-Locking Capability

One of the key features of screw jacks is their self-locking capability. The friction generated between the screw and the nut prevents the load from descending unintentionally when no force is applied. This ensures safety and stability during lifting and positioning operations.

4. Manual Operation

Manual screw jacks are operated by hand using a crank handle or a lever. The operator rotates the worm gear, which translates into linear motion along the screw. This manual control allows for precise positioning and adjustment of the load.

5. Mechanical Efficiency

Screw jacks are known for their high mechanical efficiency. The design minimizes energy losses during the lifting process, resulting in more efficient power transmission. This makes screw jacks an energy-saving and cost-effective solution.

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

The difference between a screw jack and a hydraulic jack lies in the mechanism used to generate force for lifting and lowering loads.

A screw jack operates using a mechanical screw and nut mechanism, as explained earlier. It relies on the rotation of a worm gear to drive linear motion along the screw, resulting in load elevation or descent.

On the other hand, a hydraulic jack utilizes fluid power to create force. It consists of a hydraulic cylinder and a piston that moves within the cylinder. When hydraulic pressure is applied, the piston moves, causing the load to rise or lower.

While both types of jacks serve similar purposes, screw jacks offer advantages such as self-locking capability, precise positioning, and ease of manual operation. Hydraulic jacks, on the other hand, provide faster and more powerful lifting capabilities.

How to choose or customize the right screw jack?

screw jack

1. Load Capacity

Consider the maximum load you need to lift or support. Choose a screw jack with a load capacity that exceeds your requirements to ensure safe and reliable operation.

2. Travel Length

Determine the distance the load needs to travel. Select a screw jack with a suitable travel length to accommodate your application’s specific needs.

3. Speed and Efficiency

Assess the desired lifting speed and efficiency. Different screw jack models offer varying degrees of speed and mechanical efficiency. Choose accordingly to optimize your operational requirements.

4. Environmental Factors

Consider environmental conditions such as temperature, humidity, and exposure to corrosive substances. Choose a screw jack with appropriate materials and protective coatings to ensure longevity and reliable performance in your specific environment.

5. Integration and Customization

Ensure the screw jack is compatible with your existing systems or equipment. Look for customization options to meet any specific requirements or integration needs.

About HZPT

As a leading manufacturer of industrial motors, gearboxes, and drives in China, HZPT is committed to technological innovation and superior product quality. Our extensive product range includes micro gear motors, medium-sized gear motors, brake adjustable speed motors, torque motors, DC motors, NMRV worm gear motors, bevel gear motors, WPRV worm gear reducers, rigid face gear reducers, helical worm gear reducers, parallel shaft helical gear reducers, spiral bevel gear reducers, worm screw lifts, rigid face gear reducers, and planetary gear reducers. These transmission products find wide application in various industries such as material handling, food processing, medical equipment, printing, textile machinery, packaging, office equipment, and instrumentation. We are the preferred choice for automation equipment.

Our Products and Advantages

1. High-Quality Manufacturing: Our screw jacks are manufactured to the highest industry standards, ensuring durability, efficiency, and long service life.

2. Customization Options: We offer a wide range of customization options to meet specific customer requirements. From load capacity to travel length, we can tailor our screw jacks to suit your unique applications.

3. Suitable for Various Environments: Our screw jacks are designed to withstand challenging environmental conditions, including extreme temperatures and corrosive substances. This ensures reliable performance in diverse industrial settings.

4. Precise Positioning: With our screw jacks, you can achieve accurate and precise load positioning, allowing for efficient and controlled movements in your applications.

5. Cost-Effective Solution: Our screw jacks offer excellent value for money. They are energy-efficient, require minimal maintenance, and provide reliable performance, making them a cost-effective choice for your lifting and positioning needs.


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.