Tag Archives: metal pulley

China Hot selling Custom Metal Recycling Magnetic Pulley for Belt Conveyor crankshaft pulley

Product Description

 

High quality permanent magnetic pulley magnet

Product Description

Magnetic belt conveyor drum pulley would supply you more magnets of what you want for greater attracting power and holding power, keeping harmful, dangerous ferrous particles out of your processing system or redeem valuable ferrites from other substances.

      Application:

  • Waste recovery
  • Mining
  • Recycling Applications
  • Cement
  • Coal Handling Plant
  • Refractory
  • Minerals

Specifications:

 

Modle No. Drum Specs Suitable Belt width Magnetic Intensity Bearing Type   Allowable Torques KN.m Wheight
Dia(mm) Length(mm) mm Gs  dayside  rubber Kg
CT56 5                     Tel: 24 54112666                                

Certification: CE
Pulley Sizes: as Required
Manufacturing Process: Forging
Material: Stainless Steel
Surface Treatment: Polishing
Application: Chemical Industry, Grain Transport, Mining Transport, Power Plant
Samples:
US$ 650/Piece
1 Piece(Min.Order)

|
Request Sample

Customization:
Available

|

Customized Request

sheave pulley

Can compound pulleys be customized for specific load requirements?

Yes, compound pulleys can be customized to meet specific load requirements. Here is a detailed explanation of how compound pulleys can be customized for specific load requirements:

1. Pulley Selection: The selection of pulleys is a crucial aspect of customizing a compound pulley system for specific load requirements. Different types of pulleys, such as fixed pulleys and movable pulleys, can be chosen based on the desired mechanical advantage and lifting capacity. Pulleys with different sizes, materials, and designs can be selected to accommodate the specific load requirements and operating conditions. Additionally, pulleys may have features such as bearings or sheaves that reduce friction and enhance performance.

2. Configuration Design: The configuration of the compound pulley system can be designed or adjusted to optimize its lifting capacity for specific load requirements. The number of pulleys, the arrangement of the pulleys, and the ratio of fixed to movable pulleys can be customized to achieve the desired mechanical advantage and lifting capacity. By carefully designing the configuration, the compound pulley system can be tailored to handle specific loads efficiently and effectively.

3. Material Selection: The choice of materials for the cables or ropes used in the compound pulley system can be customized based on the load requirements. Different materials, such as wire ropes, synthetic ropes, or high-performance ropes, offer varying levels of strength, flexibility, and resistance to environmental factors. The selection of the appropriate material ensures that the cables or ropes can safely support and lift the specific loads without compromising the integrity of the system.

4. Load Capacity Analysis: Customizing a compound pulley system for specific load requirements involves conducting load capacity analysis. This analysis takes into account factors such as the weight of the load, the desired lifting capacity, the applied force, and the mechanical advantage provided by the compound pulley system. By performing load capacity calculations, engineers and designers can determine the optimal configuration, pulley selection, and safety factors required to meet the specific load requirements.

5. Safety Considerations: Customizing compound pulleys for specific load requirements also involves considering safety factors. It is essential to ensure that the compound pulley system is designed and customized to handle the loads safely, without exceeding the weight capacity of the pulleys, cables, or ropes. Adequate safety margins should be incorporated to account for dynamic or unexpected loads that may occur during lifting operations. Compliance with relevant safety standards and regulations is crucial to ensure the safe and reliable performance of the customized compound pulley system.

By considering pulley selection, configuration design, material selection, load capacity analysis, and safety considerations, compound pulleys can be effectively customized to meet specific load requirements. Customization allows for the efficient and safe lifting of heavy loads in various industries and applications.

sheave pulley

Can compound pulleys be part of industrial manufacturing and assembly lines?

Yes, compound pulleys can be an integral part of industrial manufacturing and assembly lines, offering numerous benefits in terms of efficiency, productivity, and load handling. The use of compound pulleys in these settings allows for the effective movement and manipulation of heavy loads, making them suitable for a wide range of applications. Here is a detailed explanation of how compound pulleys can be part of industrial manufacturing and assembly lines:

  1. Heavy Load Handling: Industrial manufacturing and assembly lines often involve the lifting and positioning of heavy components or materials. Compound pulleys provide the mechanical advantage necessary to handle these loads with ease. By distributing the weight across multiple lines of support, compound pulleys reduce the amount of force required to lift and move heavy objects, minimizing the strain on workers and increasing productivity.
  2. Efficiency and Productivity: Compound pulleys enhance the efficiency and productivity of industrial manufacturing and assembly lines. The mechanical advantage they offer allows for the efficient transfer of force, enabling workers to move heavy loads more easily and quickly. This improved efficiency translates into higher production rates, shorter cycle times, and overall increased productivity in the manufacturing and assembly processes.
  3. Precise Positioning: Compound pulleys facilitate precise positioning of components or materials in industrial manufacturing and assembly lines. The configuration and control of the pulley system allow workers to adjust the tension and alignment of the ropes or cables, enabling accurate and controlled movements. This precision is crucial when aligning parts, inserting components, or assembling intricate products that require meticulous placement.
  4. Safe Load Handling: Safety is a paramount concern in industrial manufacturing and assembly lines. Compound pulleys enhance safety by reducing the physical strain on workers when handling heavy loads. The mechanical advantage provided by the pulley system minimizes the risk of musculoskeletal injuries and fatigue associated with manual lifting. Additionally, the precise control and stability of compound pulleys contribute to safer load positioning, reducing the potential for accidents and damage to equipment.
  5. Flexibility and Adaptability: Compound pulleys offer flexibility and adaptability to industrial manufacturing and assembly lines. They can be easily integrated into existing systems or customized to meet specific requirements. The arrangement and combination of pulleys can be adjusted to achieve the desired mechanical advantage and lifting capacity for different tasks or loads. This flexibility allows for the efficient handling of diverse products and materials within the manufacturing and assembly processes.

In summary, compound pulleys can play a vital role in industrial manufacturing and assembly lines by providing the mechanical advantage, efficiency, precise positioning, safe load handling, and flexibility necessary for effective load movement and manipulation. Incorporating compound pulleys into these settings can significantly improve productivity, reduce physical strain on workers, and enhance overall safety and performance.

sheave pulley

How do compound pulleys provide mechanical advantage in lifting tasks?

A compound pulley system is designed to provide mechanical advantage, allowing for easier lifting of heavy loads. Here is a detailed explanation of how compound pulleys provide mechanical advantage in lifting tasks:

1. Distribution of Load: In a compound pulley system, the load is distributed across multiple line segments. Each line segment supports a portion of the load’s weight. As more line segments are added, the load’s weight is divided among them, reducing the force required to lift the load. This distribution of load is a key factor in providing mechanical advantage.

2. Force Amplification: The mechanical advantage of a compound pulley system is determined by the number of line segments supporting the load. Each additional line segment increases the mechanical advantage. When force is applied to the free end of the rope or cable, it is transmitted across the pulleys and distributed among the line segments. The force applied to the rope or cable is amplified as it is divided among the multiple line segments, allowing for easier lifting of the load.

3. Change in Direction of Force: Compound pulleys also change the direction of the force applied. When force is applied downward on the free end of the rope or cable, the movable pulleys move upward, lifting the load. This change in direction of force allows the user to exert force in a more convenient or favorable direction, making it easier to lift the load.

4. Increased Rope Travel: In a compound pulley system, the rope or cable travels a greater distance compared to the distance the load is lifted. This increased travel distance allows for a greater mechanical advantage. As the movable pulleys move upward, the length of rope or cable on one side of the pulley system decreases while the length on the other side increases. This movement contributes to the amplification of force and the reduction of effort required to lift the load.

5. Combination of Fixed and Movable Pulleys: Compound pulley systems incorporate a combination of fixed and movable pulleys. The fixed pulleys serve as anchor points and change the direction of the force, while the movable pulleys are connected to the load and provide the mechanical advantage. The combination of fixed and movable pulleys working together allows for a more efficient distribution and amplification of force, resulting in mechanical advantage.

Overall, compound pulleys provide mechanical advantage in lifting tasks through the distribution of load, force amplification, change in direction of force, increased rope travel, and the combination of fixed and movable pulleys. By utilizing these principles, compound pulley systems make it easier to lift heavy loads and reduce the amount of effort required by the user.

China Hot selling Custom Metal Recycling Magnetic Pulley for Belt Conveyor   crankshaft pulley	China Hot selling Custom Metal Recycling Magnetic Pulley for Belt Conveyor   crankshaft pulley
editor by CX

2023-11-16

China manufacturer Custom Metal Recycling Magnetic Pulley for Belt Conveyor belt pulley

Product Description

 

High quality permanent magnetic pulley magnet

Product Description

Magnetic belt conveyor drum pulley would supply you more magnets of what you want for greater attracting power and holding power, keeping harmful, dangerous ferrous particles out of your processing system or redeem valuable ferrites from other substances.

      Application:

  • Waste recovery
  • Mining
  • Recycling Applications
  • Cement
  • Coal Handling Plant
  • Refractory
  • Minerals

Specifications:

 

Modle No. Drum Specs Suitable Belt width Magnetic Intensity Bearing Type   Allowable Torques KN.m Wheight
Dia(mm) Length(mm) mm Gs  dayside  rubber Kg
CT56 5                     Tel: 24 54112666                                

Certification: CE
Pulley Sizes: as Required
Manufacturing Process: Forging
Material: Stainless Steel
Surface Treatment: Polishing
Application: Chemical Industry, Grain Transport, Mining Transport, Power Plant
Samples:
US$ 650/Piece
1 Piece(Min.Order)

|
Request Sample

Customization:
Available

|

Customized Request

sheave pulley

What safety considerations should be kept in mind when using compound pulleys?

When using compound pulleys, several important safety considerations should be kept in mind to ensure the well-being of operators, prevent accidents, and maintain the integrity of the equipment. Here is a detailed explanation of the safety considerations associated with the use of compound pulleys:

  1. Qualified Personnel: It is essential to have trained and qualified personnel who understand the principles of compound pulleys and their safe operation. Only individuals with the necessary knowledge, training, and experience should be authorized to work with compound pulleys. Adequate training ensures that operators are familiar with the equipment, know how to perform tasks correctly, and are aware of potential hazards and safety procedures.
  2. Equipment Inspection and Maintenance: Regular inspection and maintenance of compound pulleys are crucial for ensuring safe operation. Before each use, the pulleys should be carefully inspected for any signs of wear, damage, or faulty components. Any issues identified during the inspection should be promptly addressed and repaired. Routine maintenance, such as lubrication and adjustment of pulley components, should be conducted as per the manufacturer’s guidelines to prevent malfunctions and ensure optimal performance.
  3. Weight Capacity: The weight capacity of compound pulleys should never be exceeded. Each pulley and the entire pulley system have specific weight limits that must be strictly adhered to. Overloading the pulleys can cause structural failure, rope or cable breakage, or accidents. It is crucial to accurately assess the weight of the load and ensure that the compound pulleys being used are rated for that weight. If necessary, additional pulleys or alternative lifting methods should be employed to handle heavier loads.
  4. Proper Rigging: The rigging of compound pulleys should be done correctly to ensure safe lifting and operation. The ropes or cables should be securely attached to the pulleys, and proper knots or connections should be used to prevent slippage or detachment. The rigging system should be designed to distribute the load evenly across the pulleys and prevent any excessive stress or strain on individual components. It is essential to follow industry best practices and standards for rigging to maintain the integrity and stability of the compound pulley system.
  5. Clear Communication: Clear and effective communication among the operators involved in compound pulley operations is crucial for maintaining safety. Operators should establish a clear method of communication, such as hand signals or radio communication, to coordinate their actions during lifting or lowering operations. Proper communication ensures that everyone is aware of the tasks being performed, the timing of movements, and any potential hazards or changes in the operation.
  6. Personal Protective Equipment (PPE): Operators working with compound pulleys should wear appropriate personal protective equipment (PPE) to minimize the risk of injuries. PPE may include safety helmets, gloves, safety glasses, and safety footwear. The specific PPE requirements may vary depending on the nature of the task, the environment, and any specific hazards associated with the operation. Operators should be trained on the proper use and maintenance of PPE and should always wear it when working with compound pulleys.
  7. Emergency Preparedness: Adequate emergency preparedness is essential when using compound pulleys. Operators should be familiar with emergency procedures, including how to respond to equipment malfunctions, unexpected load shifts, or accidents. Emergency stop buttons or switches should be easily accessible and clearly marked. It is important to have a well-defined plan for evacuating the area in case of emergencies and ensuring that all personnel are aware of the plan and their roles.
  8. Training and Documentation: Ongoing training and documentation are crucial for maintaining a safe working environment when using compound pulleys. Operators should receive comprehensive training on the safe operation, maintenance, and inspection of compound pulleys. Training should be periodically refreshed to ensure that operators are up to date with the latest safety practices. Documentation, including operating manuals, inspection records, and maintenance logs, should be maintained and readily available for reference.

By keeping these safety considerations in mind, operators can work with compound pulleys in a safe and responsible manner, minimizing risks, preventing accidents, and ensuring the efficient and reliable operation of the equipment.

sheave pulley

What is the significance of proper alignment and tensioning in compound pulley systems?

Proper alignment and tensioning are of utmost significance in compound pulley systems as they directly affect the performance, efficiency, and safety of the system. When compound pulleys are correctly aligned and appropriately tensioned, several benefits are realized. Here is a detailed explanation of the significance of proper alignment and tensioning in compound pulley systems:

  1. Optimal Mechanical Advantage: Proper alignment and tensioning ensure that the compound pulley system operates at its maximum mechanical advantage. The mechanical advantage is the ratio between the load being lifted and the force applied to the rope or cable. When the pulleys are aligned correctly and the tension is properly adjusted, the load is distributed evenly among the multiple lines of support, resulting in efficient force distribution and increased lifting capacity.
  2. Efficient Power Transfer: Correct alignment and tensioning minimize energy losses and enhance power transfer within the compound pulley system. When the pulleys are aligned, the ropes or cables move smoothly over the sheaves, reducing frictional losses. Proper tensioning ensures that the ropes or cables are neither too loose nor too tight, optimizing the power transfer from the input force to the load being lifted. This efficient power transfer results in improved system performance and reduced energy consumption.
  3. Prevention of Excessive Wear and Damage: Improper alignment and tensioning can cause excessive wear and damage to the components of the compound pulley system. Misalignment can lead to uneven loading on the ropes or cables, causing them to rub against the sheaves or other parts of the system. This friction can result in accelerated wear, deformation, or even failure of the ropes, cables, sheaves, or bearings. Proper alignment and tensioning help distribute the load evenly, minimizing wear and extending the lifespan of the system components.
  4. Reduction of Stress and Fatigue: Correct alignment and tensioning reduce stress and fatigue on the ropes or cables, as well as on the pulley system itself. When the ropes or cables are properly tensioned, they experience less strain during the lifting or lowering process. This reduces the risk of overloading and premature failure of the ropes or cables. Additionally, proper alignment ensures that the forces are evenly distributed, preventing excessive stress on individual components of the pulley system and promoting its longevity.
  5. Enhanced Safety: Proper alignment and tensioning contribute to the overall safety of the compound pulley system. Misalignment or improper tensioning can lead to unexpected movements, jerks, or loss of control during lifting operations. This can pose a significant safety hazard to operators and bystanders. By ensuring proper alignment and tensioning, the system operates smoothly, minimizing the risk of accidents, injuries, and damage to property.

In summary, proper alignment and tensioning are crucial for the optimal performance, efficiency, and safety of compound pulley systems. They enable the system to operate at its maximum mechanical advantage, facilitate efficient power transfer, prevent excessive wear and damage, reduce stress and fatigue, and enhance overall safety. Regular inspection and maintenance should be carried out to ensure that compound pulley systems remain properly aligned and tensioned throughout their lifespan.

sheave pulley

What is a compound pulley, and how does it function in mechanical systems?

A compound pulley is a type of pulley system that consists of multiple fixed and movable pulleys working together to provide mechanical advantage in lifting or moving heavy loads. Here is a detailed explanation of what a compound pulley is and how it functions in mechanical systems:

A compound pulley is composed of two or more pulleys, which are connected by a continuous loop of rope, cable, or belt. The pulleys are arranged in such a way that some are fixed to a support structure, while others are movable. The rope or cable wraps around the pulleys, creating multiple line segments that support the load.

The primary function of a compound pulley is to multiply the force applied to the rope or cable, allowing the user to lift or move heavy loads with less effort. This mechanical advantage is achieved through the distribution of the load’s weight across multiple line segments and the reduction of the force required to lift the load.

When a force is applied to the free end of the rope or cable, the movable pulleys in the compound pulley system move in response. As the movable pulleys move, the length of rope or cable on one side of the pulley system decreases while the length on the other side increases. This movement causes the load to be lifted or moved.

The mechanical advantage provided by a compound pulley is determined by the number of line segments supporting the load. Each additional segment of rope or cable increases the mechanical advantage of the system. For example, a compound pulley with three line segments supporting the load provides a mechanical advantage of three, meaning the force applied to the rope or cable is multiplied by three.

Compound pulleys are commonly used in various mechanical systems, including cranes, hoists, elevators, and block and tackle systems. They are particularly useful in situations where heavy loads need to be lifted or moved with reduced effort or where space constraints make it challenging to incorporate larger, single-pulley systems.

It is important to note that while compound pulleys can provide mechanical advantage, they also introduce some trade-offs. As the mechanical advantage increases, the distance through which the rope or cable needs to be pulled also increases. Additionally, compound pulley systems may introduce some friction and inefficiency, requiring regular maintenance and lubrication to ensure smooth operation.

In conclusion, a compound pulley is a pulley system that utilizes multiple fixed and movable pulleys to provide mechanical advantage in lifting or moving heavy loads. By distributing the load across multiple line segments, compound pulleys reduce the force required to lift the load, making them valuable components in various mechanical systems.

China manufacturer Custom Metal Recycling Magnetic Pulley for Belt Conveyor   belt pulley	China manufacturer Custom Metal Recycling Magnetic Pulley for Belt Conveyor   belt pulley
editor by CX

2023-09-27

China high quality Sprocket Pulley Price Cast Iron Metal Transmission Machine Parts Good Quality Manufacture Best Sale Belt Toothed Cutter Aluminum European Standard Timing Pulley double pulley

Product Description

Sprocket Pulley Price Cast Iron Metal Transmission Machine Parts Good Quality Manufacture Best Sale Belt Toothed Cutter Aluminum European Standard Timing Pulley   

Certification: CE, ISO
Pulley Sizes: Type F
Manufacturing Process: Forging
Material: Carbon Steel
Surface Treatment: Baking Paint
Application: Chemical Industry, Grain Transport, Mining Transport, Power Plant
Samples:
US$ 9999/Piece
1 Piece(Min.Order)

|
Request Sample

pulley

Types of pulleys and their advantages and disadvantages

There are several types of pulleys. Learn the basic equations of the pulley system. Then learn about the different uses for pulleys. The disadvantages of using pulleys will be covered. Knowing these, you can buy the pulley that suits your needs. Here are some of the best pulley types and their pros and cons.

Basic equations of pulley systems

A pulley system is a mechanism that allows two blocks of a certain mass to be connected by a taut rope. The acceleration of each block is the same in magnitude and direction. The external force acting on each block is the weight of the block (10g) and the tension in the string. The tension between the two blocks is the total tension and the force acting on the pulley is the weight of the two blocks.
This simple mechanism uses two simple equations to explain how the system works. First, the mass of the weight on both sides of the pulley must be the same. When the weight is forced to move, the rope tightens and the second pulley descends. The weight is also attached to the second pulley and must be the same distance as the first pulley. This will result in a speed ratio of 2 times the distance covered by the first pulley.
Second, we have to calculate the force required to lift the object. The lower mass is supported by a wire configuration passing through all pulleys, while the uppermost pulley is used to apply the force. The lower block is used to support the weight. The applied force needs to travel a distance nx to move the weight. This distance, called MA, can be written as:
Once we have gathered the necessary information, we can apply the calculations to the pulley system. We can also use the Mechanical Advantage Calculator to calculate the force on the anchor. To do this, we must apply a force to the load as well as to the pulley itself. Using this equation, we can calculate the force required by the load to lift the load.
pulley

Types of pulleys

There are three basic types of pulleys: movable, fixed and compound. Both types of pulleys translate the force applied to them. The ideal mechanical advantage of pulleys is two. This is because a single movable pulley only doubles the force, whereas a compound pulley doubles or triples the force. This type of pulley is often used with other types of pulleys.
Movable pulls move with the weight of the load, and the force pulling them increases on the lift side. They are often found in utility elevators and construction cranes. These systems are very simple, inexpensive and quiet to use. The force required to lift the object depends on the mechanical advantage of the system. The two most common types of pulleys are listed below. Let’s take a closer look at each one.
V-shaped pulleys are used in vehicles and electric motors. These pulleys require a “V” belt to function properly. Some have multiple “V” grooves to avoid slipping. They are used in heavy duty applications to reduce the risk of power slip. These pulleys also have more than one “V” groove. V-belt pulleys are commonly used in vehicles and electric motors.
Composite pulleys are made from more than one type of cable or rope wrapped around the wheel. They can be fixed or hinged and are usually made of stainless steel or bronze. Composite pulleys have multiple layers and can be a single unit or many different components. There are three main types of pulleys: fixed pulleys and composite pulleys. These are the most common types. Almost every type of pulley is used for some type of application.
Fixed pulleys have one advantage over movable pulleys: they change direction as the weight of the load increases. They are typically used in heavy construction equipment. Gun tackles, patio tackles, and stationary tackles are examples of equipment that use a pulley mechanism. These devices are very common and can be found on most modern construction sites. They provide great convenience for lifting large loads.

application

What are the applications of pulleys? Simply put, a pulley is a mechanical device that transforms a difficult task into an easier one. It consists of ropes and pulleys. It is usually used to lift objects. Usually, people wrap a rope around a pulley and pull up to lift the object. One disadvantage of using pulleys is that they require the same force as lifting the object directly.
One of the most popular applications of pulleys is lifting heavy objects. They help people pull up heavy objects and blocks. The system can also be used in seeders, lifts, grinders, etc. Other applications include raising flags, loading cargo, pulling curtains and rock or mountain climbing. Students can learn about the various uses of pulleys and the physics behind them.
Pulleys can be made of many different materials, depending on the application. Some are movable, which means they move with the object they are used to lift. This pulley system can be made of nylon, wire rope or fiber material. The best part about these systems is that they are easy to install and maintain. For a better grasp, use the guide or video tutorial to learn more about the pulley system and how it works.
Tapered pulleys are common in paper mills. They are high-quality pulleys that transmit power to connected parts. They can be dynamic or static and have different balances. Because pulley systems are highly customized, most industrial applications require systems designed specifically for specific applications. In this way, the system is safe, simple and inexpensive. The benefits of this design are endless.
The most common use of pulleys is for motor drives. They are used to minimize noise by applying force to the shaft to reduce the workload. They are also less expensive than gears and do not require lubrication. Furthermore, they can change the direction of the applied force. They are also less expensive than gears and are often used with other components. A screw is a cylindrical member with helical ribs used to connect something.
pulley

shortcoming

Although the pulley system makes it easier to move heavy objects, it still has some drawbacks. When using a pulley system, you must remember that the force required to lift the weight increases with the number of cycles. In addition, the distance between the puller and the heavy object increases, which may lead to accidents. Also, moving heavy objects can be tricky if the rope slips. Pulley systems are not very expensive and can be easily assembled. However, it does require a lot of space.
First, it is not efficient. Besides being inefficient, pulleys produce different forces at different speeds. Fixed pulleys use more force than the load, while movable pulleys move with the load. A movable pulley requires less force than a fixed pulley, but the combined system travels a long distance. Therefore, this method is not as efficient as the fixed method.
Pulleys are not only used in industrial processes. You can see them in various places in your daily life. For example, large construction cranes use pulleys to lift heavy loads. Even flagpoles, blinds, clotheslines, ziplines, motors and climbing equipment use pulleys. Still, despite their advantages, the disadvantages are not too serious.
Another disadvantage of the pulley is its wear and tear. While a pulley’s housing is theoretically infinite, its bearings and locking components typically wear out over time. To overcome this problem, a new bearing and locking assembly can be installed. No need to replace the housing and shaft, the entire assembly can be re-bonded and painted to replicate the original look. Alternatively, the pulley can be replaced with a new housing and shaft.
Using pulleys can also reduce the advantage of pulleys. On the other hand, interception and tackle is a system in which two pulleys are connected to each other using ropes. Unlike pulleys, pulley pulley systems can be adjusted in the direction of travel and can move heavy loads up to four times their force when used in hydraulic lifts.

China high quality Sprocket Pulley Price Cast Iron Metal Transmission Machine Parts Good Quality Manufacture Best Sale Belt Toothed Cutter Aluminum European Standard Timing Pulley   double pulley	China high quality Sprocket Pulley Price Cast Iron Metal Transmission Machine Parts Good Quality Manufacture Best Sale Belt Toothed Cutter Aluminum European Standard Timing Pulley   double pulley
editor by CX