China OEM CZPT Series Worm Gear Screw Jack Electric Screw Jack Bevel Gear Screw Jack cycle gear

Product Description

1.Convenient to adjust
2.Wide range of ratio
3.Easy to install
4.high torque
Application Industries:
Our SWL series screw jacks are widely used in the industries such as metallurgy,mining,hoisting and transportation, electrical
power,energy source,constrction and building material,light industry and traffice industry

Screw Jacks in construction

Often found in climbing mechanism of construction,the screw jacks use physical means to raise and lower loads, which typically range from 5 tons to 30 tons. A screw jack is a common type of mechanical jack, which works via a motor and gearbox by an operator. A screw uses the shape of its threads to raise or lower the load, or a traveling nut does the lifting while the screw turns in place. Mechanical jacks are self-locking(not for ball screw), which means that when power is removed from the jack, the screw stays in place until power resumes. This setup makes mechanical jacks safer than their hydraulic counterparts, because users don’t have to fear a loss of power. The main components of screw jacks are; trapezoidal lifting screw also known as lead screw, worm screw, worm gear and gear housing. A worm screw is rotated manually or by a motor. With the rotation of the worm gear, the lead screw in it moves upwards or downwards linearly. The feed rate of the screw depends on the turning speed, the number of teeth of the gears and the size of the screw pitch. In some models of jackscrews, The lifting screw does not move up and down. It only rotates around its axis. A lifting nut (also known as a travelling nut) moves along the lead screw. The lifting nut of the screw jack is made of bronze to decrease friction.

Product Parameters

MODEL

 

SWL2.5

SWL5

SWL10

SWL15

SWL20

SWL25

SWL35

Maximum lifting force (kN)

 

25

50

100

150

200

250

350

Screw thread size

 

Tr30*6

Tr40*7

Tr58*12

Tr58*12

Tr65*12

Tr90*16

Tr100*20

Maximum tension (kN)

 

25

50

99

166

250

350

Worm gear ratio (mm)

P

1/6

1/8

3/23

1/8

3/32

3/32

 

M

1/24

1/24

1/24

1/24

1/32

1/32

Worm non rotating stroke (mm)

P

1.0

0.875

1.565

1.56

1.5

1.875

M

0.250

0.292

0.5

0.5

0.5

0.625

Maximum elongation of screw rod under tensile load (mm)

 

1500

2000

2500

3000

3500

4000

Maximum lifting height at maximum pressure load (mm)

The head of the screw rod is not guided

250

385

500

400

490

850

820

Lead screw head guide

400

770

1000

800

980

1700

1640

Worm torque at full load(N.m)

P

18

39.5

119

179

240

366

464

M

8.86

19.8

60

90

122

217

253

efficiency(%)

P

22

23

20.5

 

19.5

16

18

M

11

11.5

13

 

12.8

9

11

Weight without stroke(kg)

 

7.3

16.2

25

 

36

70.5

87

Weight of screw rod per 100mm(kg)

 

0.45

0.82

1.67

 

2.15

4.15

5.20

Detailed Photos

 

 

 

SWL Series worm screw Jack:

1.The elevator is a combination of turbine pair and trapezoid screw rod to complete the lifting and lowering of objects. 2.Compact structure, light weight, safety and reliability, long service life, convenient installation

3.Self-locking function in the static state.

 

1. screw rod

2. nut bolt

3. cover

4.Skeleton oil seal

5.Bearing

6.Worm gear

7.Oil filling hole

8.Case

9.Skeleton oil seal

10.Cover

11. nut bolt

12.Bearing

13.Skeleton oil seal

14.Bearing

15.worm

16.Flat key

17.Bearing

18.Skeleton oil seal

19.Cover

20.Nut bolt

Product Description

 

Related Products

 

Packaging & Shipping

 

Company Profile

 

Standard or Nonstandard: Nonstandard
Application: Textile Machinery, Garment Machinery, Conveyer Equipment, Electric Cars, Motorcycle, Food Machinery, Marine, Mining Equipment, Agricultural Machinery, Car, Power Transmission
Product Name: Swl Series Worm Gear Lift
Input Speed: 0-1440rpm
Ratio: 6-36
Applicable Industries: Hotels, Manufacturing Plant, Food & Beverage Facto
Samples:
US$ 50/Piece
1 Piece(Min.Order)

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Request Sample

screw gear

What is the purpose of using screw gears in machinery?

Screw gears, also known as worm gears, serve various purposes in machinery and mechanical systems. They offer unique advantages that make them suitable for specific applications. Here’s a detailed explanation of the purposes and benefits of using screw gears:

  • High Gear Reduction: One of the primary purposes of using screw gears is to achieve high gear reduction. Screw gears provide a significant reduction ratio, allowing for the conversion of high-speed, low-torque input to low-speed, high-torque output. This makes them ideal for applications that require precise control over torque and rotational speed, such as lifting heavy loads, positioning systems, and machinery with high torque requirements.
  • Precise Positioning: Screw gears enable precise positioning and control of linear or rotary motion. The fine-pitch threads on the worm and the corresponding worm wheel teeth allow for accurate and controlled motion. This feature makes screw gears suitable for applications that require precise positioning, such as robotics, automation, and machinery that performs intricate movements or adjustments.
  • Self-Locking: Screw gears have a self-locking property, which means that the gear mechanism remains fixed in position even when no external force is applied. The friction between the screw threads and the worm wheel prevents the system from backdriving or rotating unintentionally. This self-locking feature eliminates the need for additional braking mechanisms or external locks, making screw gears advantageous in applications where holding a position is essential for safety and stability.
  • Compact Design: Screw gears have a compact design that makes them suitable for applications with limited space. The worm and worm wheel arrangement allows for efficient power transmission in a compact layout, enabling the integration of screw gears in machinery and systems where space is a constraint. This compact design also simplifies installation and reduces the overall footprint of the equipment.
  • Quiet and Smooth Operation: Screw gears operate with reduced noise and vibration compared to other gear types. The helical nature of the threads and the sliding/rolling contact between the worm and worm wheel result in a smooth and gradual meshing motion. This smooth operation contributes to quieter machinery, making screw gears desirable in applications where noise reduction is important, such as in residential environments, audio equipment, and precision instruments.
  • High Shock Load Resistance: Screw gears are known for their ability to handle shock loads effectively. The helical shape of the threads and the larger contact area between the worm and the worm wheel distribute the load more evenly, reducing the risk of sudden failures or damage due to shock or impact loads. This shock load resistance makes screw gears suitable for applications that involve sudden changes in load or external forces.
  • Reliability and Durability: Screw gears are recognized for their reliability and durability. The simplicity of their design, with fewer moving parts, reduces the likelihood of mechanical failures. Additionally, the self-locking feature minimizes the chances of unwanted movement or slippage. When properly lubricated and maintained, screw gears can have a long service life and require minimal maintenance, contributing to the overall reliability of machinery.
  • Wide Range of Applications: Screw gears find application in various industries and machinery types. They are utilized in manufacturing equipment, robotics, medical devices, automotive systems, elevators, material handling machinery, and many other systems that require precise control, high torque, compactness, and reliable power transmission.

The purpose of using screw gears in machinery is to provide efficient power transmission, precise positioning, high torque multiplication, self-locking capabilities, and reliable operation. These features make screw gears a valuable component in numerous applications, enhancing performance, safety, and overall functionality of machinery and mechanical systems.

screw gear

How do you address thermal expansion and contraction in a screw gear system?

Addressing thermal expansion and contraction in a screw gear system is crucial to ensure the proper functioning and longevity of the system. Thermal expansion and contraction occur when a system is subjected to temperature changes, leading to dimensional changes in the components. Here’s a detailed explanation of how to address thermal expansion and contraction in a screw gear system:

  1. Material Selection: Choose materials for the screw gear system components that have compatible coefficients of thermal expansion (CTE). Using materials with similar CTE can help minimize the differential expansion and contraction between the components, reducing the potential for misalignment or excessive stress. Consider materials such as steel, bronze, or other alloys that exhibit good dimensional stability over the expected operating temperature range.
  2. Design for Clearance: Incorporate proper clearances and tolerances in the design of the screw gear system to accommodate thermal expansion and contraction. Allow for sufficient clearance between mating components to accommodate the expected dimensional changes due to temperature variations. This can prevent binding, excessive friction, or damage to the gears during temperature fluctuations.
  3. Lubrication: Utilize appropriate lubrication in the screw gear system to mitigate the effects of thermal expansion and contraction. Lubricants can help reduce friction, dissipate heat, and provide a protective film between the mating surfaces. Select lubricants that offer good thermal stability and maintain their properties across the expected temperature range of the system.
  4. Thermal Insulation: Implement thermal insulation measures to minimize the exposure of the screw gear system to rapid temperature changes. Insulating the system from external heat sources or environmental temperature fluctuations can help reduce the thermal stresses and minimize the effects of expansion and contraction. Consider using insulating materials or enclosures to create a more stable temperature environment around the screw gear system.
  5. Temperature Compensation Mechanisms: In certain applications, it may be necessary to incorporate temperature compensation mechanisms into the screw gear system. These mechanisms can actively or passively adjust the position or clearance between components to compensate for thermal expansion or contraction. Examples include thermal expansion compensation screws, bimetallic elements, or other devices that can accommodate dimensional changes and maintain proper alignment under varying temperatures.
  6. Operational Considerations: Take into account the thermal characteristics of the environment and the operational conditions when using a screw gear system. If the system is expected to experience significant temperature variations, ensure that the operating parameters, such as load capacities and operating speeds, are within the design limits of the system under the anticipated temperature range. Monitor and control the temperature of the system if necessary to minimize the effects of thermal expansion and contraction.
  7. System Testing and Analysis: Conduct thorough testing and analysis of the screw gear system under various temperature conditions to assess its performance and behavior. This can involve measuring dimensional changes, analyzing gear meshing characteristics, and evaluating the system’s ability to maintain proper alignment and functionality. Use the test results to validate the design, make any necessary adjustments, and optimize the system’s performance under thermal expansion and contraction effects.
  8. Maintenance and Inspection: Establish a regular maintenance and inspection routine for the screw gear system to monitor its performance and address any issues related to thermal expansion and contraction. This can involve checking clearances, lubrication levels, and the overall condition of the system. Promptly address any signs of excessive wear, misalignment, or abnormal operation that may be attributed to temperature-related effects.

By considering material selection, design clearances, lubrication, thermal insulation, temperature compensation mechanisms, operational considerations, and regular maintenance, it is possible to effectively address thermal expansion and contraction in a screw gear system. These measures help ensure the system’s reliability, minimize wear and damage, and maintain the desired performance and functionality over a range of operating temperatures.

screw gear

Can you explain the concept of screw gear threads and their functions?

Screw gear threads play a crucial role in the operation and functionality of screw gears, also known as worm gears. The threads are an essential component of the worm, which is the cylindrical gear with a helical thread wrapped around it. Here is a detailed explanation of the concept of screw gear threads and their functions:

  • Thread Design: The threads on a screw gear, specifically the helical thread on the worm, are designed in a helical shape, resembling the threads of a screw. The helical thread is wrapped around the cylindrical body of the worm, creating a continuous spiral path along its length. The pitch of the thread refers to the distance between successive thread crests or valleys.
  • Meshing with Worm Wheel: The primary function of the screw gear threads is to mesh with the teeth of the worm wheel. The helical thread of the worm engages with the teeth of the worm wheel, creating a sliding contact between them. As the worm rotates, the helical thread drives the rotation of the worm wheel, transmitting rotational motion and power.
  • Gear Reduction and Torque Multiplication: The helical design of the screw gear threads allows for a large number of teeth on the worm wheel to be engaged at any given time. This results in a high gear reduction ratio, meaning that for each revolution of the worm, the worm wheel rotates by a smaller fraction. The gear reduction ratio enables torque multiplication, making screw gears suitable for applications requiring high torque output.
  • Precision Positioning: Screw gear threads are crucial for achieving precise positioning in applications where accuracy is essential. The fine pitch of the helical thread allows for small incremental movements, enabling precise control over the rotation of the worm wheel. This feature is particularly advantageous in applications such as robotics, where accurate positioning and motion control are necessary.
  • Self-Locking Action: The helical thread design of screw gears gives them a self-locking capability. When the worm is not rotating, the friction between the helical thread and the teeth of the worm wheel tends to hold the gear system in place. This self-locking action prevents the worm wheel from backdriving the worm, providing inherent braking or locking functionality. It ensures that the gear mechanism maintains its position without the need for additional braking or locking mechanisms.
  • Efficiency and Lubrication: The sliding action between the screw gear threads and the teeth of the worm wheel introduces more friction compared to other types of gears with rolling motion. This sliding motion affects the efficiency of the gear mechanism, resulting in higher energy losses and heat generation. Proper lubrication with appropriate lubricants is essential to minimize wear, reduce friction, and improve the overall efficiency of the screw gears.

Overall, screw gear threads enable the meshing and transmission of rotational motion and power between the worm and the worm wheel. They facilitate gear reduction, torque multiplication, precise positioning, and self-locking action. Understanding the design and functions of screw gear threads is crucial for utilizing screw gears effectively in various applications.

China OEM CZPT Series Worm Gear Screw Jack Electric Screw Jack Bevel Gear Screw Jack cycle gearChina OEM CZPT Series Worm Gear Screw Jack Electric Screw Jack Bevel Gear Screw Jack cycle gear
editor by CX 2023-10-07