3B QD Bushed Sheaves Pulleys for “A” and “B” Belts

Size Bushing Type Pulley Type Pitch Diameter (B) Pitch Diameter (A) Outside Diameter (E) (F) (L) (M) Pulley Weight (LBS)
3B34SH SH E 3.4″ 3.0″ 3.75″ 1-27/32″ 2-1/2″ 1-5/16″ 21/32″ 4.4
3B36SH SH D 3.6″ 3.2″ 3.95″ 15/32″ 2-1/2″ 1-5/16″ 1-21/32″ 4.7
3B38SH SH D 3.8″ 3.4″ 4.15″ 15/32″ 2-1/2″ 1-5/16″ 1-21/32″ 5.3
3B40SH SH D 4.0″ 3.6″ 4.35″ 15/32″ 2-1/2″ 1-5/16″ 1-21/32″ 5.6
3B42SH SH D 4.2″ 3.8″ 4.55″ 15/32″ 2-1/2″ 1-5/16″ 1-21/32″ 5.9
3B44SH SH D 4.4″ 4.0″ 4.75″ 15/32″ 2-1/2″ 1-5/16″ 1-21/32″ 6.3
3B46SD SD A 4.6″ 4.2″ 4.95″ 13/32″ 2-1/2″ 1-13/16″ 9/32″ 6.7
3B48SD SD A 4.8″ 4.4″ 5.15″ 13/32″ 2-1/2″ 1-13/16″ 9/32″ 7.1
3B50SD SD A 5.0″ 4.6″ 5.35″ 13/32″ 2-1/2″ 1-13/16″ 9/32″ 7.4
3B52SD SD A 5.2″ 4.8″ 5.55″ 13/32″ 2-1/2″ 1-13/16″ 9/32″ 7.8
3B54SD SD A 5.4″ 5.0″ 5.75″ 13/32″ 2-1/2″ 1-13/16″ 9/32″ 8.2
3B56SD SD A 5.6″ 5.2″ 5.95″ 13/32″ 2-1/2″ 1-13/16″ 9/32″ 8.5
3B58SD SD A 5.8″ 5.4″ 6.15″ 13/32″ 2-1/2″ 1-13/16″ 9/32″ 8.8
3B60SD SD A 6.0″ 5.6″ 6.35″ 13/32″ 2-1/2″ 1-13/16″ 9/32″ 9.1
3B62SD SD A 6.2″ 5.8″ 6.55″ 13/32″ 2-1/2″ 1-13/16″ 9/32″ 9.4
3B64SD SD A 6.4″ 6.0″ 6.75″ 13/32″ 2-1/2″ 1-13/16″ 9/32″ 9.7
3B66SD SD A 6.6″ 6.2″ 6.95″ 13/32″ 2-1/2″ 1-13/16″ 9/32″ 10.0
3B68SD SD B 6.8″ 6.4″ 7.15″ 13/32″ 2-1/2″ 1-13/16″ 9/32″ 10.5
3B70SK SK D 7.0″ 6.6″ 7.35″ 3/32″ 2-1/2″ 1-15/16″ 21/32″ 11.0
3B74SK SK D 7.4″ 7.0″ 7.75″ 3/32″ 2-1/2″ 1-15/16″ 21/32″ 12.0
3B80SK SK D 8.0″ 7.6″ 8.35″ 3/32″ 2-1/2″ 1-15/16″ 21/32″ 12.5
3B86SK SK D 8.6″ 8.2″ 8.95″ 3/32″ 2-1/2″ 1-15/16″ 21/32″ 13.0
3B94SK SK D 9.4″ 9.0″ 9.75″ 3/32″ 2-1/2″ 1-15/16″ 21/32″ 16.0
3B110SK SK D 11.0″ 10.6″ 11.35″ 3/32″ 2-1/2″ 1-15/16″ 21/32″ 19.0
3B124SK SK D 12.4″ 12.0″ 12.75″ 3/32″ 2-1/2″ 1-15/16″ 21/32″ 24.0
3B136SK SK D 13.6″ 13.2″ 13.95″ 3/32″ 2-1/2″ 1-15/16″ 21/32″ 27.0
3B154SK SK D 15.4″ 15.0″ 15.75″ 3/32″ 2-1/2″ 1-15/16″ 21/32″ 30.0
3B160SK SK D 16.0″ 15.6″ 16.35″ 3/32″ 2-1/2″ 1-15/16″ 21/32″ 33.0
3B184SK SK D 18.4″ 18.0″ 18.75″ 3/32″ 2-1/2″ 1-15/16″ 21/32″ 38.0
3B200SF SF D 20.0″ 19.6″ 20.35″ 7/32″ 2-1/2″ 2-1/16″ 21/32″ 43.0
3B250SF SF D 25.0″ 24.6″ 25.35″ 7/32″ 2-1/2″ 2-1/16″ 21/32″ 54.0
3B300SF SF D 30.0″ 29.6″ 30.35″ 7/32″ 2-1/2″ 2-1/16″ 21/32″ 67.0
3B380E E D 38.0″ 37.6″ 38.35″ 17/32″ 2-1/2″ 2-3/4″ 9/32″ 90.0

3B series pulleys are manufactured for A, AX, AA, 4L, B, BX, BB, and 5L v-belts, ranging from 3.75″ to 38.35″ in diameter. Depending on the pulley size, they are made to use with SH, SDS, SK, SF, or E QD bushings, which we also stock. Most of our 3-groove 3B QD bushed pulleys are manufactured from a high-strength grade 35 cast iron, are phosphate-coated, and are painted for anti-corrosion. All of them are balanced at the factory for smooth machinery operation. The main benefit of using a QD (quick detachable) pulley is that if the bushing (hub) breaks, you don’t have to replace the whole assembly, or if just the pulley gets worn out, the same principle applies. The other significant benefit is that there is a broader range of bore options with QD pulleys than with the “fixed-bore” style.

3B Style QD Bushed Pulley Size Chart

A-B Combination QD Bushing Type Pulleys

•    A-B Combination Pulleys are offered in 1 through 10 grooves
•    QD Bushings provide inventory flexibility by just changing out the bore size of the bushing.
•    Combination groove on the A-B Sheaves can accommodate a wide assortment of belts (4L, 5L, A, AX, B & BX) for maximum flexibility and horsepower range
•    Sheaves are balanced & accurately machined to minimize vibration
•    Largest selection of products of any Sheave Manufacturer assurance to have the best effect for specific application and most economical drive design
•    First in the industry to provide sheaves with the durability of a powder coat paint, which protects products from rusting in high moisture environments

How is QD Bushing Different from Taper Bushing?

QD bushing is also known as flange bushing. There are specific differences between Taper bushing and QD bushing. The primary difference between the 2 types of the bushing is the existence of a flange in QD bushing. The QD style has a flange around the outside diameter, whereas, in the case of taper lock, the bushing has straight sides on the outer diameter.

QD bushing uses the external hex to drive it into the bore of the component that has been installed. In the case of taper bushing, the internal head cap screw is used to drive it into the bore that has been installed. Using external hex by QD bushing helps get a larger bore capacity than taper lock bushing.

The difference between the QD bushing and taper bushing is mainly due to the existence of an external key. This helps QD bushing to have excellent torque carrying capability.

Technological Processing

Company Profile

HZPT is a professional manufacturer of mechanical parts. Our main products are belt pulleys, sprockets, taper sleeves, coupling, and other transmission parts. Its products are mainly exported to Germany, Britain, France, and other European countries, with an annual export value of 18 million U.S. dollars, accounting for more than 65% of the total output. The annual output value reached 200 million yuan.

Our products all adopt international, European, and American advanced industrial standards, use precise and good processing equipment, develop reasonable production technology, apply efficient and flexible management systems, and improve the quality management system to ensure that the product quality is good and the price is affordable.

Our factory adheres to the enterprise concept of “quality: the basis of enterprise survival, integrity: the basis of enterprise development, service: the source of enterprise development, low price: the instrument of enterprise development.” We are always looking forward to the presence of customers at home and abroad, seeking CZPT benefits and joint cause development.

Warehouse Stock

The warehouse covers an area of 5000 square meters and can provide all kinds of standard models A/B/C/Z, with complete quantity and large quantity in stock. Meanwhile, it accepts all sorts of non-standard customization for drawing production. The daily production capacity is 10 tons, and the delivery time is short.

Packaging & Shipping

Experienced Workers Packing Pulleys Carefully, safe wooden cases keep parts from being injured or damaged during sea or air shipment.

FAQ

Q1. Are you a manufacturer or a trading company?

A: We are a manufacturer and trading company.

Q2. What is your sample policy?

A: We can supply the sample if we have finished parts in stock, but customers need to pay for the sample cost and shipping fee.

Q3. Can you produce according to the samples?

A: We can produce power transmission parts according to your samples or technical drawings. We can build the molds and fixtures.

Q4. Do you test all your goods before delivery?

A: Yes, we have 100% test before delivery.

Q5. Can you customize pulleys?

A: Yes, please send us your drawing for an accurate quotation.

Q6. How long is your delivery time and shipment?

A: 1. Sample Lead-times: 10-20 days.

2. Production Lead-times: 30-45 days after the order is confirmed.

Q7. How do you make our business a long-term and good relationship?

A: 1. We keep good quality and competitive price to ensure our customers’ benefits ;

2. We respect every customer as our friend and sincerely do business and make friends with them, no matter where they come from.

Q8: What are your advantages?

1. The most competitive price and good quality.

2. Perfect technical engineers give you the best support.

3. OEM is available.

Additional information

Overview of Different Types of Pulleys

A pulley is a wheel mounted on a shaft or shaft. Its purpose is to facilitate the movement or change of direction of the cable or taut rope, and to transmit power between the cable and the shaft. Pulleys are typically used for lifting, winding or forklift applications. If you are building your own pulley system, the following design and installation considerations should be followed. This article will give you an overview of the different types of pulleys.
pulley

Pulley System Mechanics

There are many different ways to utilize the mechanism of the pulley system. The most basic pulley system consists of a fixed wheel and a support frame. Both components are connected by ropes or cables used to support the load. A pulley system is effective when the force required to lift the load is less than the weight of the object being lifted.
One way to use a pulley system is to suspend a block with a mass of 0.80 kg on a fixed pulley. Then another person can hang a bucket weighing up to 40kg. The weight of the bucket is transferred to the fixed pulley. The rope is attached to the pulley by a loop or sling. The rope will spin and pull on the barrel or block.
The pulley system is also an important tool for lifting heavy objects. Pulleys are often used in construction equipment to make lifting heavy objects easier. Gun tackles, yard tackles, and stationary tackle systems are common examples of these devices. They use the mechanical advantage of the design to guide the force that lifts the object. If you want to learn more about pulley systems, visit Vedantu. This website will provide you with a full description of the mechanism and its application.

Types of pulleys

Many different types of pulleys are used to lift heavy objects. They change the direction of the force and are an integral part of the cable system. Therefore, pulleys can move large and heavy objects more easily. However, before buying a pulley, you should have an idea of ​​the benefits it brings. Below are some of the most common uses for pulleys.
Conical Pulley: Consists of several small conical pulleys connected to each other. The larger base of 1 pulley is used to guide the force. Round pulleys are used in the same way as step pulleys. They are widely used in industry and can be purchased at any hardware store. Pulleys are a huge investment, and the benefits they provide far outweigh the cost.
Movable Pulls: These are similar to their names, but work by allowing objects to move with the pull. Their movable parts are attached to the object to be lifted. They are also ideal for lifting heavy loads and can be found in utility elevators and construction cranes. They are also used in many other industries. They can also be made of wood, plastic or metal. The type of pulley you use depends on its intended use.

Mechanical Advantages of Pulley Systems

A pulley system is a simple machine that reduces the effort required to lift heavy loads. This mechanical advantage is proportional to the number of loops. For example, if you have a single rope loop, you must apply equal force to lift the weight. When you add another rope loop, you can lift heavier weights just by applying the same force. Therefore, a pulley system is an excellent way to use gravity to your advantage.
Mechanical advantage is a measure of the effectiveness of a pulley system. This ratio of force to work is called the mechanical advantage. In other words, if the rope system has a large mechanical advantage, it means that it requires less force to lift heavier loads. This advantage is usually measured in kilograms and is the same for all pulley systems. In general, the greater the mechanical advantage, the less effort is required to lift the load.
The mechanical advantage of a pulley system is that a single movable pulley requires half the force to lift an object than a single fixed pulley. Assuming frictionless bearings, the MA of a single pulley system is 2, similar to the MA of a single lever. A single pulley travels twice as much as it takes to move heavy objects manually.
pulley

Considerations when designing and installing a pulley system

The capacity of the pulley depends on the type and diameter of the cable. Besides its diameter, its sheath should also support it well. The basic function of the pulley is also important. However, most people 10d to ignore the pulley selection process, resulting in ineffective load-pull capabilities. To avoid such problems, different parameters must be carefully considered during design and installation.
During the design and installation of the pulley system, the ratio of the cable diameter to the largest pulley diameter must be considered. Those who work in the industrial sector will have an idea of ​​this ratio. The greater the D:d ratio, the greater the capacity of the cable to withstand the load. The best way to ensure secure design is to take the right information and use it to design a system that is both robust and secure.
When designing a pulley system, it is important to remember that the pulley needs to have enough power to operate safely. In addition to horsepower, the belt should have sufficient elongation to absorb shock loads. If the elongation of the belt is very small, it is very likely that the teeth will be sheared or broken, causing serious damage to the system. Extensive belt sag should be compensated for by offsetting the driven pulley. Finally, the frame supporting the pulley should be rigid. Otherwise, the non-rigid frame will cause center distance and tooth skipping changes.

Add more pulleys to the system

Adding more pulleys to the spool might have some effect. The friction between the rope and the pulley increases with the number of pulleys, which in practice limits the number of spools. The best solution is to combine the pulleys into 1 housing. If the load is small enough, adding a few pulleys probably won’t make a difference.
Using multiple pulleys allows a single load to be lifted with half the force required. The longer the rope, the greater the mechanical advantage. In fact, a spool can withstand a load of 100 N. Additionally, adding more pulleys quadrupled the mechanical advantage. In this case, a single 100 N load would require a force of 25 Newtons.
When the rope is used, it stretches as the weight of the object increases. This will make the rope longer, increasing its length and increasing the distance over which the load can be lifted. Eventually, the rope will break and the lifted object will fall. Then you will have to buy a new rope. It may seem like an expensive proposition, but it pays off in the long run.

cast iron pulley

Cast iron pulleys are the most popular choice among industrial users. They are made of solid cast iron and usually cost very little. Their rims are held in place by a mesh that extends from a central boss. They also have spokes and arms that hold them in place. These pulleys are ideal for a variety of applications including fan belts, compressors and conveyors.
V-groove drive pulleys are ideal for general purpose pulleys. It has an inner diameter of 1 inch and is commonly used in feeders and ventilation curtain systems. Its steel straps prevent rust and ensure it meets or exceeds industry standards. 3-1/2″ cast iron pulleys are also available. In addition to the V-groove drive pulley, there are similar pulleys for power transmission. The V-groove drive pulley is powder coated for added durability.
The cross section of the arm is elliptical, with the long axis twice as long as the short axis. The radius of the arm is equal to the diameter of the pulley. The thickness of the arm is a key factor to consider when purchasing a pulley. If you’re not sure which material you need, you can always consider wooden or steel pulleys. They are lighter and have a higher coefficient of friction than metal pulleys.
pulley

timing pulley

Plastic timing pulleys have many advantages over steel timing pulleys. On the 1 hand, they are lightweight and corrosion resistant, making them ideal for applications that do not require high torque and 10sile strength. Another benefit is their resistance to high temperatures. Plastic timing pulleys are ideal for applications involving flammable gases, solvents or particles. They can last for many years. For more information on the different types of plastic timing pulleys.
Vertical shaft drives require flanged timing pulleys. For large span drives, at least 1 of these pulleys must be flanged. The flange provides a secure connection to the shaft and prevents ratcheting of the timing belt. Finally, HTD timing belt teeth prevent timing belt ratcheting. These teeth need a large enough space to be seated. However, they can also cause a backlash. These pulleys are not suitable for applications where positional accuracy is critical.
Timing belt systems are designed to avoid such problems. The drive shaft and the driven shaft are aligned with each other. The pulleys are located on different planes and are connected by pitch lines. The pitch line of the timing pulley coincides with the pitch line of the belt. These pulleys are also easier to implement and maintain. It is better to use a synchronous system because the resulting gear system emits less noise than other systems.

step pulley

As one of leading step pulley manufacturers, suppliers and exporters of products, We offer step pulley and many other products.

Please contact us for details.

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