China Good quality Make a 2.5 Ton Hand Wheel Screw Jack with Stainless Steel Material in China, Manual Hand-Wheel Jack Screws, Miniature Worm Gear Manual Screw Jacks bevel gearbox

Product Description

Hand wheels are available for Linear Power Jack so that it can be easily used for manual operation. Hand wheels are used for self-lock equipped Linear Power Jacks (Machine Screw Type) only. Because Linear Power Jacks (Ball Screw Type) and Linear Power Jacks (High Lead Screw Type) are not equipped with a self-lock, the input shaft may be reversed by a load, therefore, it is dangerous to use the hand wheel. Hand wheel efficiency is determined by the required torque for a specified load and the diameter of the hand wheel. Also, vibration and shock may cause self-lock failure, in which case a brake unit is recommended. 
Hand wheels must not be mounted on the drive shaft when not operating the screw jack. Separate storage is required! Use of Screw Jacks Fitted With Emergency Stop Disc: To prevent over travel of the lead screw, a stop disc or nut can be fitted to a screw jack that is hand operated. It should not be used as a full power stop.

All CHINAMFG screw jacks with handwheels are ideal solutions for applications where electricity or power generators is inconvenient or dangerous, light weight, low duty cycle, low target cost and short travel length. Available in load capacity 1/4 ton, 1/2 ton, 1 ton, 2 ton, 2.5 ton, 3 ton, 5 ton, 10 ton, 15 ton and 20 ton, heavy load larger than 20 ton capacity, handwheel manual operation is not recommended. There are 2 types hand wheels, 1 is cast iron handwheels, another aluminum handwheels. The cast iron handwheels sizes 16567X3, registered Capital 500000CNY) is a leading manufacturer and supplier of Screw Jacks (Mechanical Actuators), Bevel Gearboxes, Lifting Systems, Electric Linear Actuators, Gearmotors and Speed Reducers, Others Linear Motion and Power Transmission Products in China. Most of them are passed CE certificates. We are located in Chang An, Xihu (West Lake) Dis. guan, Guang dong in China. We are an audited professional manufacturer and supplier by SGS (Serial NO.: QIP-ASI192186) and BV (Serial NO.: MIC-ASR257162) organizations. We have a strict quality system, with senior engineers, experienced skilled workers and practiced sales teams, and consistently provide the customers with the best engineered solution for precision linear actuation, power transmission and mechanical jacking systems. CHINAMFG Industry guarantees quality, reliability, performance and value for today’s demanding industrial applications.

Company Advantages
* One of the biggest orders with 1750 units screw lift jacks.
* Standard products with 2D Drawings(DXF, DWG, PDF) and 3D CAD Model(STEP).
* 100% quality assured with double quality inspections. Original Inspection Reports, Operation Manual, and Book Catalogue are put into the packages. 
* 100% safety transportation with strong standard export plywood cases materials (free fumigation). 
* International standard materials for all standard products. 
* Custom design available, OEM service available, Free engineering advice and Customer label available.

Products List
* Manual Screw Jacks
* Electric Screw Jacks
* Screw Jacks Series: 

Cubic Screw Jack JTC Series, Machine Screw Jack JTW Series, Trapezoidal Screw Jack JT Series, Worm Screw Jack JTM Series, Stainless Steel Screw Jack JSS Series, Through Hole Screw Jack JTH Series, Ball Screw Jack JTB Series, Cubic Ball Screw Jack JTD Series, Bevel Gear Screw Jack JTS Series, and Electric Cylinder JTE Series.
* Bevel Gearboxes Series: 
Cubic Bevel Gearbox JTP Series, Hollow Shaft Gearbox JTPH Series, Input Flange Gearbox JTPF Series, Input Flange and Hollow shaft Gearbox JTPG Series, Stainless Steel Gearbox JTP Series, Aluminum Gearbox JTA Series, and Spiral Bevel Gearboxes JT Series.
* Screw Jack Lifting Systems and Accessories: 
2jacks lifting system, 3jacks lifting system, 4jacks lifting system, 6jacks lifting system, 8jacks lifting system……14jacks lifting system. Lifting systems accessories cover ac, dc motors, geared motors, servo motors, stepper motors, handwheels, couplings, universal joints, telescopic universal joints, connecting shafts, cardan shafts, limit switches, proximity switches, safety nut, travel nut, rod ends, stop nuts, pillow block bearings, flange blocks, motor flange nema or iec, encoder, potentiometer, frequency converter, position indicators, trunnion plate, and trunnion mounting brackets. 
* Electric Linear Actuators Series:
Electro Mechanical Actuators LA Series, Electro Mechanical Actuators LAP Series. 
* Gear Reducers Series: 
Helical Gear Reducers R Series, Helical Bevel Gear Reducers K Series, Parallel Shaft Helical Gear Reducers F Series, Helical Worm Gear Reducers S Series, Helical Gear Motor GMH/GMV Series, and Worm Gear Reducers NMRV Series.   

Customers Distribution Countries
* American Countries: United States, Mexico, Canada, Chile, Argentina, Xihu (West Lake) Dis.via, Brazil, Colombia, Guatemala, Honduras, Panama, Peru.
* European Countries: Germany, France, United Kingdom, Italy, Spain, Poland, Romania, Netherlands, Belgium, Greece, Czech Republic, Portugal, Sweden, Hungary, Austria, Switzerland, Bulgaria, Denmark, Finland, Slovakia, Norway, Ireland, Georgia, Slovenia.
* Asian Countries: Malaysia, Indonesia, Singapore, Philippines, Vietnam, Thailand, India, Israel, Cambodia, Myanmar, Sri Lanka, Maldives, Pakistan, Iran, Turkey, Jordan, Saudi Arabia, Yemen, Oman, United Arab Emirates, Qatar, Georgia, Armenia.
* Oceanian Countries: Australia, New Zealand.
* African Countries: Egypt, Ethiopia, Nigeria, South Africa, Zambia, Mozambique.

Application: Machinery, Marine, Agricultural Machinery, Lifting Systems, Lift Tables, Lifting Platforms
Hardness: Hardened Tooth Surface
Installation: 90 Degree
Layout: Coaxial
Gear Shape: Bevel Gear
Step: Single-Step
Customization:
Available

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Customized Request

screw gear

How does a screw gear impact the overall efficiency of a system?

A screw gear, also known as a worm gear, plays a significant role in the overall efficiency of a system. The design and characteristics of the screw gear can influence several factors that affect the system’s efficiency. Here’s a detailed explanation of how a screw gear impacts the overall efficiency of a system:

  • Gear Ratio: The gear ratio of a screw gear system determines the relationship between the input and output speeds. In a screw gear, the gear ratio is typically high, which means that a small rotation of the worm gear results in a larger rotation of the worm wheel. This high gear ratio allows for precise control and slow movement, but it also leads to a trade-off in terms of mechanical efficiency. The high gear ratio can result in a lower mechanical efficiency due to increased friction and power loss.
  • Friction and Efficiency: Screw gears inherently introduce more friction compared to other gear types due to the sliding motion between the worm and the worm wheel. This sliding action generates friction, which can reduce the overall efficiency of the system. The efficiency of a screw gear system depends on various factors, including the materials used, the lubrication, and the design parameters. Proper lubrication and the use of high-quality materials can help minimize friction and improve the efficiency of the system.
  • Lubrication and Efficiency: Adequate lubrication is crucial for reducing friction and maximizing the efficiency of a screw gear system. The lubricant forms a film between the contacting surfaces of the worm gear and worm wheel, reducing direct metal-to-metal contact and minimizing frictional losses. Insufficient or improper lubrication can lead to increased friction, higher operating temperatures, and reduced efficiency. Therefore, proper lubrication, including the selection of the appropriate lubricant type and viscosity, is essential for optimizing the efficiency of the system.
  • Backlash: Backlash refers to the play or clearance between the mating teeth of the worm gear and worm wheel. Excessive backlash can lead to energy loss and reduced efficiency. It can cause vibrations, impacts, and inefficient power transmission. Therefore, minimizing backlash through precise manufacturing and proper meshing of the gears is essential for maintaining high efficiency in a screw gear system.
  • Mechanical Efficiency: The mechanical efficiency of a screw gear system is influenced by various factors, including the design, manufacturing tolerances, lubrication, load conditions, and operating speed. In general, screw gears tend to have lower mechanical efficiency compared to other gear types, such as spur gears or helical gears. However, advancements in gear design, materials, and lubrication technologies have improved the overall efficiency of screw gear systems in recent years.
  • Application Considerations: The impact of a screw gear on the overall efficiency of a system also depends on the specific application requirements. Screw gears are commonly used in applications that prioritize precise motion control over high efficiency, such as in applications requiring heavy loads or precise positioning. In such cases, the advantages of screw gears, such as high gear ratios and self-locking capabilities, outweigh the potential efficiency trade-offs.

It is important to note that the overall efficiency of a system is influenced by multiple factors beyond the screw gear itself, including other components, power transmission losses, and system design. Therefore, when evaluating the efficiency of a system, it is essential to consider the collective impact of all components and factors involved.

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

What are the applications of screw gears?

Screw gears, also known as worm gears, find a wide range of applications across various industries. Their unique characteristics make them suitable for specific purposes where precise motion control, torque multiplication, or holding position is required. Here is a detailed explanation of the applications of screw gears:

  • Machinery and Manufacturing: Screw gears are commonly used in machinery and manufacturing equipment. They are employed in gearboxes and power transmission systems to achieve speed reduction or torque multiplication. They can be found in conveyor systems, packaging machines, material handling equipment, and other industrial machinery where controlled motion and high gear ratios are necessary.
  • Automotive Systems: Screw gears have applications in automotive systems, particularly in steering mechanisms. They are used in worm and sector steering gears to convert the rotational motion of the steering wheel into the linear motion required for turning the vehicle’s wheels. The self-locking property of screw gears is advantageous in maintaining the position of the wheels after steering input.
  • Elevators and Lifts: Screw gears are utilized in elevator systems and lifts for vertical transportation. They are commonly employed in the elevator hoisting mechanism, where the rotational motion of the motor is converted into vertical movement. The high gear reduction ratio of screw gears allows for controlled and precise lifting operations.
  • Valve Actuators: Screw gears find applications in valve actuators, which are used to control the opening and closing of valves in various industries. By converting the rotational motion of an electric or manual input into linear motion, screw gears enable precise positioning of valve stems. This allows for accurate flow control in fluid systems, such as water treatment plants, oil refineries, and chemical processing facilities.
  • Robotics and Automation: Screw gears play a vital role in robotics and automation systems. They are employed in robot joints and robotic arm mechanisms to provide precise movement and positioning. Screw gears allow for controlled and repeatable motion, making them suitable for applications that require accurate manipulation, such as assembly lines, pick-and-place machines, and robotic surgery systems.
  • Camera and Optics Systems: Screw gears are used in camera and optics systems to control focus, zoom, and aperture adjustments. They are commonly found in camera lenses and telescope mechanisms. The fine and precise movement provided by screw gears enables accurate focusing and zooming, facilitating high-quality image capture and precise optical alignment.
  • Medical Equipment: Screw gears have applications in medical equipment where controlled and precise movement is necessary. They are used in surgical robots, prosthetic limbs, medical imaging devices, and other medical instruments that require accurate motion control and positioning. The self-locking characteristic of screw gears is particularly advantageous in maintaining stable positions and preventing undesired movement.
  • Security Systems: Screw gears are employed in security systems, such as combination locks and safes. They provide the mechanical advantage required to rotate the locking mechanisms and ensure secure operation. The self-locking property of screw gears adds an extra layer of security by preventing unauthorized access through reverse rotation or manipulation.

These are just a few examples of the diverse applications of screw gears. Their ability to provide high gear ratios, precise motion control, and self-locking capabilities makes them valuable in various industries where efficient power transmission, accurate positioning, and controlled movement are essential.

China Good quality Make a 2.5 Ton Hand Wheel Screw Jack with Stainless Steel Material in China, Manual Hand-Wheel Jack Screws, Miniature Worm Gear Manual Screw Jacks bevel gearboxChina Good quality Make a 2.5 Ton Hand Wheel Screw Jack with Stainless Steel Material in China, Manual Hand-Wheel Jack Screws, Miniature Worm Gear Manual Screw Jacks bevel gearbox
editor by CX 2023-10-20

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