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We are the construction hardware manufacturer, specializing in the production of various window and door accessories, 10 years of production history, quality is guaranteed! We can provide professional industry services and the most cost-effective prices to help you find the right products as soon as possible, saving you time and price costs.

1.[Specifications] Various specifications can be customized according to your needs
2.[Material] Optional, zinc alloy,aluminium alloy,and stainless steel, we can make!
3.[Service]window and door handles,transmission rod,corner device,roller,hinge,flush bolt,friction stay,cylinder,plastic strips etc.!


2571 Hot Selling High Quality Window and Door accessories
Material: zinc alloy,aluminium alloy,and stainless steel or as per your requirements.
MOQ: 1000 PCS
Colors: As your requirement
Finishing Anodized,powder coating&polishing etc.
Packing details: Packed into box,50 boxes into 1 carton, or customized as per your requirement.

–  we are confident to meet any customer’s production requirements and provide a full range of professional production solutions . 
– We are specialized in whole accessories of aluminium window and door.
– we are awarded with ISO9001 quality assurance certificate by China.

About Company profile
HangZhou  CZPT Construction Hardware Co.,LTD is a leading company in the window and door accessories  industry in HangZhou,China. Established in 2011, we already have 10 years of experience.
The factory covers an area of 40,00 square meters.  etc. Besides, most of our workers are skillful and experienced. 
Our main products are window and door accessories,hinge,friction stay,rod,lock cyclinder,strip,etc.
Both big orders and small orders are welcomed. Email us to feel our amazing service.

Decent Industrial Inc. introduced advanced customization, large-scale production equipment, workshop purification treatment, keep neat and orderly, to meet the strict requirements of product packaging.

The company has passed ISO9001:2008 quality assurance certificate .
This ensures that all we offer our customers the highest standard products and excellent service.

– Payment: 30% T/T deposit payment in advance, balance should be paid before shipment.
– Production lead time: 10 – 20 days after deposit payment.
– Shipping methods: International Express, CZPT freight.
– FOB shipping port: HangZhou, mainland China.
– EXW/ FOB prices are available.
– Your inquiry related to our product & price will be replied within 8hours.
– Well-trained & experienced staff are to answer all your inquiries in English of course.
– Working time: We will be online most of time, if not, will reply you very soon.
– OEM & ODM projects are highly welcomed. We have strong R&D team here to help.
– Your business relationship with us will be confidential to any third party.
– Good after-sale service offered, please get back if you got question.

Why choose us ?
1. Quality Control
In order to ensure the quality of our packaging boxes and other products, our quality control personnel will conduct strict evaluations, incoming inspections, in-process inspections, final inspections and pre-delivery inspections on suppliers. Most importantly, we listen to the opinions of our customers and are always looking for ways to improve product quality through continuous improvement.
2. OEM Ability       
We have established a stable and long-term cooperative relationship with a large number of well-known overseas brands. We can also provide ODM, OEM and agency services for global customers.
 3. Parts Available                      
We have spare parts for immediate delivery to anywhere in the world. While our vehicles become standard with more features than anyone else, we also offer more optional parts for our vehicles than anyone else.
4. Professional industry experience
We take customer satisfaction and product quality as our top priority. We provide reliable warranty and good after-sales service.
(1) Our company’s advantages over other peers
  A. We have more than 10 years of experience.
  B. We have a professional design and production team, which can absolutely competitive price advantages.
C. We are a professional manufacturer of window and door accessories. We provide OEM services for global buyers.
(2) How do we get a detailed price list.
   Please provide us with detailed information about the product, such as size color, specific packaging requirements and purchase quantity.
3) How is the quality of our products?
Our raw materials are purchased from qualified suppliers. And we have a strong quality control team to ensure our quality. We always care about your concern! !

-Your inquiries about our products and prices will be answered within 8 hours.
-Of course, well-trained and experienced staff will answer all your inquiries in English.
-Working hours: We will be online most of the time, if not, we will reply to you as soon as possible.
-OEM&ODM projects are highly welcomed. We have a strong R&D team to help you.
-Your business relationship with us will be kept confidential from any third party.
-Provide good after-sales service, if you have any questions, please come back as soon as possible.

Types of Pulley Systems

If you’ve ever tried to lift a pail of water, you’ve probably seen the pulley system in action. Pulleys are extremely useful tools for everything from household appliances to heavy industrial machinery. Different kinds of pulley systems are classified according to their amount of motion. Some types have fixed axes, while others have movable axes. Some common uses of pulleys are listed below.

two-wheel pulley

Pulleys are complex structures with thin-walled and thick-walled sections. Therefore, they require specific forging designs. The tool concept for the production of pulleys is shown in Figure 11.6. Using the generated tool, the pulley can be forged into different shapes. Process parameters must be optimized based on material, surface quality and metallographic analysis.
Pulleys are wheels mounted on shafts. Its main function is to assist the movement of heavy objects. A single-wheel pulley can change the direction of the force, enabling a person to pull heavy objects. A dual-wheel pulley distributes the weight evenly across both wheels, allowing it to lift the same weight with half the effort.
The mechanical advantage of a two-wheel pulley is that it reduces the force required by about half. A 100 kg object can be lifted with a force of 500 Newtons. The mechanical advantage of a pulley with 2 wheels is twice that of a single-wheel pulley. However, care should always be taken when using two-wheel pulleys.
Two-wheel pulleys can be fixed or movable. A single wheel pulley can only change direction when the load is placed on 1 side of the wheel. Two-wheel pulleys change direction when lifting a load, requiring half the force. Live wheels are better for heavier loads. The movable pulley can be adjusted with the load, and the load distribution is more uniform. Active pulleys can be used with single-rope or two-wheel pulleys.
A pulley system with 2 wheels is called a compound pulley. This type of pulley system has a complex design that reduces the force required to move the load. Two-wheel pulleys are common in industrial and construction environments. These pulleys require a lot of space to install and operate. Additionally, they require regular maintenance to avoid wear and tear.

composite pulley

Compound pulleys are used to increase lift. One fixed pulley is attached to the overhead while the other fixed pulley is attached to the load. This setup minimizes the force required to lift weights, allowing you to lift heavier weights. There are several different types of compound pulleys, each with their own strengths and weaknesses. Below are some examples of their application. Some of the most common are listed below.
Composite pulleys are usually made from 2 different types of wheels. The first 1 is fixed and secure. The second type, movable, is attached to something that moves. The third type, compound pulley, is a combination of a movable pulley and a fixed pulley. Below are 3 types of comparisons. The table below compares them and explains their advantages and disadvantages. Composite pulleys are the most versatile of the three.
The number of sheave segments that make up the composite sheave system increases the mechanical advantage of the system. Each segment adds 1 percent of the total weight, and the ideal mechanical advantage is 2 or more. So a compound pulley with 4 segments will lift three-quarters of the weight. This is because the force applied to the load is multiplied by four. The result is a better boost.
While composite pulleys have many uses, they are most commonly used on larger sailboats. These pulleys work by changing the direction of the control wire or by changing the mechanical force of the rope. They also make it easier to lift heavier objects. Composite pulleys are more expensive than simple pulleys, so consider your needs before buying. The advantages of composite pulleys outweigh the disadvantages.
A basic compound pulley is a device consisting of 2 wheels with fixed points. Ropes are looped around the wheels and are used to lift heavy objects. When you pull on the rope, the rope pulls the 2 wheels closer together. Serious injury could result if this equipment is installed incorrectly. Never exceed the lifting capacity of pulleys and other safety devices that may be attached. When using pulleys, be sure to follow the instructions on the mounting hardware to avoid accidents.

Fixed pulley

Moving pulleys and fixed pulleys are different types of mechanical devices. The movable pulley moves with the object it is used to lift. Because it attaches to the object it is used to lift, it is great for lifting heavy objects. These devices are used in construction cranes and multipurpose elevators. There are many different types of pulleys, and their uses vary widely. Below is a brief overview of these devices.
The simplest pulley set consists of a wheel that is mounted on the ceiling. A rope is attached at 1 end and a person pulls at the other end. The rope is strong enough to keep a person standing while lifting weights. It takes about 200 Newtons of force to lift a 20 kg weight. In contrast, a movable pulley requires a force of 1000N, which makes it easier to lift heavy objects.
Fixed pulleys are another common lifting device. They work by using ropes and slotted wheels attached to the object to be lifted. These devices are convenient to use because they are easy to set up. Moving the scroll wheel doesn’t change direction, so it’s easier to move objects without putting too much pressure on the back. Unlike a moving rope, a moving object will feel much lighter than its actual weight.
Fixed pulleys are widely used in construction and agriculture. Fixed pulleys can help lift supplies and equipment from scaffolding. These items are often heavy and difficult to lift directly. Fixed pulleys at the top of the scaffolding will allow people at the bottom to lift objects more easily. As a result, those at the bottom are less stressed and more productive. Fixed pulleys will save time and money compared to moving ropes.
Composite pulleys combine fixed and movable pulleys to increase the power of movement. A compound pulley system uses both types of pulleys and enables a person to change direction by reversing the direction of a force. The compound pulley system will save time and effort as the user only has to put in half the effort. Unlike moving ropes, composite pulleys are easy to adjust and are the most versatile system on the market.

Blocks and tackles

A pulley block system is a rope hoist that uses a set of pulleys mounted on a frame. The blocks are arranged in a row, and the threaded rope is called a pulley. Pulley systems help amplify the tension of the rope and are common in sailboats, cranes and drilling rigs. However, these systems are not without drawbacks.
The pulley pulley system can be equipped with as many pulleys as required. This method allows a person to lift heavy objects. The pulley block system can contain the required number of pulleys to achieve the desired height. The main disadvantage of pulley systems is that they create a lot of friction on the pulley shaft.
Pulley systems use 2 types of pulleys. A movable pulley is attached to the load, allowing it to move with the load. On the other hand, fixed pulleys are fixed on fixed points. Therefore, a pulley block system may consist of multiple pulleys mounted on a shaft. For example, the 2 pulleys attached to the shaft each have their own mechanical advantages.
Several types of tackle systems have been developed in recent centuries. The most basic is the gun mount, which uses 2 pulleys to lift the load. The mechanical advantage of such a system is 2 to 3 times the distance required by the rope to move the load. Depending on how they’re assembled, the system can lift 400 pounds with 80 or 100 pounds of force.
Another type of pulley is a combination of multiple wheels. The wheels on pulleys are supported by a housing or frame. The chain is attached to the pulley, and the rope is pulled to lift it. A combined pulley system will have multiple wheels. As the load increases, the force on the pulley also increases. This approach is generally more expensive than intercept and intercept systems.

China Standard Factory Chrome Plated Aluminium Window Roller Sliding Door Wheel Pulley     near me supplier China Standard Factory Chrome Plated Aluminium Window Roller Sliding Door Wheel Pulley     near me supplier

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