Screw Jack

Why Choose Us

Customized Service
The company can customize the machine according to the production needs of different customers, processing speed, moving speed, processing size, etc. can be adjusted to meet the individual needs of different customers.

Professional Team
The company has a professional technical team and after-sales service team, which can provide customers with timely and professional technical support and solutions.

Integrity
The company adheres to the business philosophy of honesty and trustworthiness, focuses on product quality and service quality, and has won wide praise from customers.

Continuous Cooperation
The company has established long-term and stable cooperative relationships with customers in many parts of the country, and many customers have purchased the machines for many times due to their superior performance, which further proves the quality of the company's products and service level.

What is Screw Jack

A screw jack, also known as a jackscrew, is a simple yet ingenious mechanical device designed to lift heavy loads or apply a controlled linear force by converting rotary motion into linear motion. It consists of a threaded screw mechanism enclosed within a housing, with a handle or crank for manual operation or a motor for powered use. Screw jacks find widespread application in various industries, especially in automotive, manufacturing and construction. Their versatility, reliability, and mechanical advantage make them indispensable tools for tasks requiring precise positioning and heavy lifting.

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Advantages of Screw Jacks

• Provides a mechanical advantage for lifting heavy loads.
• Offers precise control for accurate positioning.
• Includes safety features to prevent overextension.
• Versatile in applications from vehicle maintenance to construction.
• Can be operated manually or with a motor.
• Known for reliability and long service life.
• Cost-effective compared to hydraulic systems.
• Energy-efficient operation, minimising power consumption.
• Compact design suits space-constrained environments.
• Requires minimal maintenance for reduced downtime.

Types of Screw Jacks

01/

Translating screw jack
In this configuration, rotations of the worm wheel directly act on the lead screw, causing it to move linearly. However, if the end of the lead screw is not fixed per customer requirements, there may be a tendency for the lead screw to rotate due to friction between the screw threads.

02/

Keyed screw jack
It is similar to the above, but the lead screw is rotated to prevent it from turning. This is crucial when the end of the lead screw is not connected to a load. Both encrypted and non-encrypted transmission screws find common use in applications where multiple screw jacks are connected to a shared load.

03/

Rotating screw jack
In this setup, the lead screws are affixed to the worm wheel, causing the rotation of the worm wheel to drive the lead screw's rotation. This, in turn, moves the nut along with the lead screws when the nut is linked to the load.

04/

Worm gear screw
A worm gear screw, also known as a worm drive or worm screw, is a mechanical arrangement consisting of a threaded screw-like component, called the worm, and a toothed wheel, known as the worm gear or worm wheel. The worm typically has a helical thread that engages with the teeth of the gear, allowing the rotational motion of the worm to drive the gear's rotation. This arrangement is highly efficient for providing a high reduction in speed and an increase in torque, making it suitable for various applications, including machinery, automotive steering systems, and conveyor systems. Worm gear screws are prized for their ability to hold positions securely, as they exhibit self-locking characteristics due to the high friction between the worm and gear teeth, preventing back-driving when the load is not turning the worm.

05/

Ball screw jack
A ball screw jack is a mechanical device that utilises a ball screw mechanism to convert rotary motion into linear motion, providing precise and efficient vertical or horizontal lifting, lowering, or positioning of heavy loads. It consists of a threaded screw shaft with ball bearings inside, encased in a protective housing. When the screw is rotated, the ball bearings move along the screw's helical groove, translating the rotational input into linear movement. This design offers several advantages, including high efficiency, reduced friction, low backlash, and high accuracy and precision, making ball screw jacks commonly used in applications such as manufacturing, automation, and material handling where precise control and reliable lifting of heavy objects are essential.

06/

Hydraulic screw jacks
Hydraulic screw jacks are mechanical devices that use hydraulic fluid to provide a high degree of lifting or lowering force with precision and control. They consist of a threaded screw, a hydraulic cylinder, and a reservoir of hydraulic fluid. When hydraulic pressure is applied to the cylinder, it exerts force on the screw, causing it to rotate and either raise or lower the load. Hydraulic screw jacks are known for their high load-bearing capacity, smooth and precise movement, and the ability to hold positions under heavy loads. They find applications in various industries, including construction, automotive, and manufacturing, where heavy equipment or machinery must be lifted, adjusted, or positioned accurately and reliably.

Components of Screw Jack

Screw
The screw is the central component of a jack screw and is usually a threaded rod or shaft. When rotated, it transforms rotational motion into linear motion, enabling the lifting or lowering of loads.

Nut
The nut is a threaded component that engages with the screw's threads. As the screw rotates, the nut moves along its length, facilitating the linear motion of the load.

Handle or drive mechanism
The handle or drive mechanism is the means by which force is applied to the screw, causing it to rotate. It can be a manually operated handle or a motor-driven mechanism, depending on the type of jack screw.

Base or mounting plate
The base or mounting plate provides stability and support for the jack screw. It is typically affixed to the ground or another stable surface to ensure the jack screw can safely lift or lower loads without tipping over.

Load platform
The load platform is the surface on which the load is placed or attached. It can come in various forms, such as a platform, cradle, or attachment point, and is designed to hold the load during lifting or lowering operations securely.

Housing or enclosure
The housing or enclosure surrounds and protects the internal components of the jackscrew. It helps prevent contaminants from entering the mechanism and provides a safety barrier around moving parts.

Safety mechanisms
Safety mechanisms are features or components that enhance the safety of the jackscrew's operation. These may include limit switches to prevent overextension, emergency stop buttons, or load-holding devices to ensure that the load remains in position even if power is lost or the drive mechanism is disengaged. Safety is paramount when working with jack screws to prevent accidents and damage to equipment.

Uses of Screw Jacks

• Lifting vehicles for maintenance.
• Adjusting the height of industrial machinery.
• Leveling and stabilising structures.
• Supporting heavy loads during construction.
• Operating stage and theatre equipment.
• Positioning solar panels.
• Raising and lowering boats in dry docks.
• Opening and closing heavy doors or gates.
• Elevating platforms and platforms in workshops.
• Facilitating precise positioning in various applications.

What Is the Principle of the Screw Jack

A screw jack is a device used to lift heavy loads, and its principle of operation is based on the transformation of a spiral linear motion. A screw jack consists of a screw, a jack housing and a handle.
When the handle is rotated, the screw rotates with it. The screw has a thread and a matching threaded hole in the jack housing. The fit between the screw and the threaded hole is very tight, creating a safe and reliable connection.
When the handle is rotated forward, the screw enters the threaded hole and pushes the piston of the jack upward. The upper part of the piston is connected to the weight, so the weight rises along with the piston.
The lifting force of the screw jack is determined by the pitch of the screw, the larger the pitch, the greater the lifting capacity of the screw jack. The lifting force is directly proportional to the size of the input force to the handle.
So we have to rotate the handle hard to let the jack lift the weight.
Screw jacks are widely used in automotive repair, building construction, and industrial production because they provide large lifting forces and are easy to use. However, it is important to note that when using a screw jack it is important to make sure that the weight is firmly placed on the upper part of the piston to avoid safety accidents.

What Are the Application Areas of Screw Jack

Industrial and civil fields: Screw jacks, as an important lifting tool, are widely used in various industrial and civil occasions. In factories, warehouses, wharves, power stations, logging yards and other occasions, screw jacks are one of the most ideal lifting equipment for lifting and carrying items.

Automobile maintenance field

Screw jack in automobile maintenance also has a wide range of applications, used to lift the car, easy to repair and replace parts.

Building construction field

In building construction, screw jacks are used to adjust the height and position of components to ensure the stability and safety of the building.

Logistics handling field

Screw jacks are also used to lift goods and pallets to facilitate the transportation and storage of goods.

Screw Jack Use Method

1.Check before use

Before using the screw jack, you must first check whether the jack is normal, whether the parts are flexible, and add lubricant. At the same time, the weight of the weight should be correctly estimated, choose the appropriate tonnage of the jack, do not overload the use.

2. Specific operation steps

• Lifting the weight: Turn the rocker in clockwise direction directly by hand, so that the lifting sleeve rises quickly to lift the weight. Insert the handle into the hole of the rocker, move the handle up and down and back and forth, the weight will rise. When the red warning line appears on the lifting sleeve, stop moving the handle immediately.

• Lowering the weight: Adjust the teeth to the opposite direction, insert the handle into the rocker hole, move the handle up and down and back and forth, and the weight will begin to fall. Lower the load slowly.

3. Caution

• Keep vertical: Before lifting the weight, keep the jack vertical to prevent the screw from being skewed and bent and the accidents caused by it.
• Uniform force: The force should be used evenly to shake the handle to avoid the up and down impact and cause accidents and damage to the jack.
• Do not exceed the maximum allowable jacking capacity: Use should not exceed the maximum allowable jacking capacity, to prevent accidents caused by overload.
• Check whether the weight is firmly supported: Before relaxing the jack to make the weight fall, you must check whether the weight has been firmly supported, and then slowly put down to ensure safety.
• Lubrication: During the use of storage, must be lubricated with grease to prevent excessive wear and tear, reducing the service life.

Screw Jack Selection Skills

Brand selection: It is recommended to buy products of well-known brands, because the product quality and performance of big brands are usually more guaranteed, while the after-sales service is also more perfect, to provide a better experience and follow-up services.

Appearance and workmanship: A good screw jack appearance of fine workmanship, baking paint uniformity, proper detailing. These details reflect the quality of the product and the importance of the manufacturer.

Specification parameters: To ensure that the selected specifications of the screw jack parameters in line with the actual demand, common specifications include 3.2 tons, 5 tons, 8 tons, 10 tons, 16 tons, 20 tons, etc., should be based on the specific use of the scene to choose the appropriate specifications.

Check the quality: When buying, should check the casting surface of the jack whether there are holes, sand holes, slag, cracks and other defects, and try to shake the handle, feel whether it is easy and smooth.

Load capacity and height range: Make sure the load capacity of the jack meets the actual demand, and consider the height range that needs to be lifted or supported, and choose the appropriate height range to ensure the use of the effect.

Quality and durability: Check the material and manufacturing process of the jack to ensure that it has good quality and durability, and can be used for a long time without damage.

Safety performance: Choose the jack with non-slip base, overload protection and other safety features to improve work safety.

Our Factory

Dezhou Jinmai Machinery Equipment Co., Ltd. is one of the early manufacturers in the field of transmission equipment in North China, with the development and growth of China's chemical equipment, conveying equipment, mining equipment industry and long-term cooperation with major equipment manufacturing research units, relying on their own innovative product technology research and development, the company's business continues to grow and provide excellence for many large and medium-sized equipment manufacturing enterprises in China Quality transmission equipment and services.

The company has all kinds of advanced production equipment and inspection equipment 50 sets, a young design and manufacturing team for product quality escort, has a high reputation in the industry. "Xurui brand" reducer in the selection of materials, materials and processing technology is unequivocal. Since 2018, our company has been implementing the real-name responsibility system for the production of product parts, who produces, who is responsible, effectively improving product quality.

FAQ

Q: Can the screw jack be placed and used standing?

A: Yes, but it is necessary to ensure that the road surface is flat and the base is stable to ensure the lifting effect.

Q: Can the screw jack be placed crookedly?

A: No, the screw jack should be placed vertically to prevent the screw from bending and causing accidents.

Q: When several screw jacks are used together, will the lifting weight be accumulated?

A: No, when several screw jacks are used together, the net weight that can be lifted will not be accumulated. The lifting or lowering speed should be kept synchronous to prevent the lifting object from being offset or shaking.

Q: What needs to be checked before using the screw jack?

A: Before use, it is necessary to check whether the jack is normal, whether the internal parts are intact, and add lubricating oil.

Q: How much is the lifting weight of the screw jack?

A: The lifting weight of the screw jack is generally small, usually not more than 30 tons, because of its large mechanical loss and low efficiency.

Q: What are the advantages of the screw jack?

A: The advantages of the screw jack are that it can lock itself, is safe and reliable to use, and is light and easy to carry.

Q: What should I pay attention to when using the screw jack?

A: Always keep your hands, feet and other parts of your body away. Do not lift objects that exceed the rated load capacity of the jack. Use the jack only on hard and level ground. Never use the jack on a slope or soft ground.

Q: How to correctly lift heavy objects with a screw jack?

A: The weight of the object must be estimated before lifting, and overloading is strictly prohibited. When using, the center of gravity of the object must be determined, the jack's focus point must be selected, and it must be placed steadily.

Q: What should I do if the screw jack is not lifting smoothly?

A: Check whether the oil cylinder is short of oil or blocked. If necessary, fill it up or clean it in time. At the same time, check whether the piston rod is broken or insufficient in length.

Q: How to maintain the screw jack?

A: Lubricate the screw jack regularly to keep the lifting sleeve and thrust bearing lubricated to prevent excessive wear.

Q: What precautions should be taken when storing the screw jack?

A: It should be stored upright and upward to avoid long-term exposure to the outdoors to prevent internal parts from rusting.

Q: What should I do if the screw jack shakes during use?

A: Check whether the ground is flat and the jack is placed stably. At the same time, ensure that the load is not too heavy to avoid overloading.

Q: What should I do if the screw jack cannot be lowered?

A: Check whether the pressure in the cylinder is too high and whether the locking device is unlocked. If necessary, adjust the pressure reducing valve to reduce the pressure or unlock the locking device.

Q: Is there a limit on the lifting height of the screw jack?

A: Yes, the lifting height should not exceed the mark line on the sleeve or piston, or 3/4 of the total height of the screw thread.

Q: How to avoid damage to the screw jack during use?

A: Avoid sudden vibrations. The force should be even when using it, and it should not exceed the maximum allowable lifting capacity.

Q: What occasions are screw jacks suitable for?

A: Screw jacks are suitable for occasions such as railway vehicle maintenance, mines, construction engineering support, and general heavy lifting and lowering.

Q: What is the transmission principle of the screw jack?

A: The screw jack rotates the pinion through the swing of the rocker, and the bevel gear rotates to drive the screw to rotate, push the lifting sleeve, and make the heavy object rise or fall.

Q: Why can the screw jack make work easier?

A: Answer: Because the torque of the screw jack is greater. Step-by-step explanation: Torque = the vertical distance between the line of action of the force and the axis of rotation × the magnitude of the force.

Q: How to clean and maintain the outside of the screw jack?

A: Always keep the surface of the body clean, check the internal structure regularly to see if it is intact, and wipe the outside with a clean cloth.

Q: What is the stress in the screw jack?

A: In the screw jack, the rotational motion is converted into linear motion. Stress such as shear stress and tensile stress will be generated in the material, which is the cause of the screw failure.

We're well-known as one of the leading screw jack manufacturers and suppliers in China. If you're going to buy customized screw jack, welcome to get quotation from our factory. For price consultation, contact us.

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