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Product Description

Product Description

Item Description
Design/Size According to customer’s drawing or sample
Material

Aluminum:6061, 6063, 6082, 7075, 5052, A380 etc.

Stainless Steel:SS201, SS301, SS303, SS304, (SS304 FOOD GRADE), SS316,SS316L,SUS430, SS416 

Steel: Mild steel, Carbon steel, 4140, 4340, Q235, Q345B, 20#, 45# etc.

Alloy steel (15Cr,20Cr,42CrMo) and other etc.

Brass:HPb63, HPb62, HPb61, HPb59, H59, H68, H80, H90 etc.

Copper,Bronze,Red copper,etc.

Titanium: TC4 (TiAl6v4, Gradef5)

Plastic:ABS, PC, PE, POM, Delrin, Nylon, plastic, PP,PEI, Peek etc.

Process CNC machining, Turning, Milling, Stamping,Lathing, Cutting, etc.
Leadtime 3-7 working days for samples generally, mass production as per detail qty after samples approval.
Surface Treatment Clear Anodized,Color Anodized,Chemical Film, Brushing, Passivating, Polishing, Chroming,Sandblasting, Laser engraving,Zinc plating,Oxide black,Nickel plating,Chrome plating,Carburized,Heat treatment,Painting
Test Equipment Coordinate Measuring Machine(CMM), 2D Measurement instrument,Projector,Altimeter,Micrometer,Thread Gages,Hardness Tester, Calipers, Pin Gauge,Salt Spray Test Machine,Concentricity Measuring Instrument
Concentricity Measuring Instrument,Spectrometer.
Quality Management System ISO 9001:2015
IATF 16949:2016
CHINA CLASSIFICATION CERTIFICATION
Application Auto parts,machinery parts,computer parts,medical parts,home appliances parts,electrical equipment parts,electrical appliances parts,electronic products parts,electronic parts,generator parts,alternator parts,dynamo parts,electric generator parts,stationery,power switches,miniature switches, architecture, commodity and A/V equipment.
File Format Solidworks,Pro/Engineer,CAD,PDF,JPG,DXF,IGS
Packing Inner-Plastic bag,Outer -Standard Carton Box,or according to customers’ requirements
Shipping By sea, by air, International Express(DHL,FedEx,TNT,UPS).
Service Warm and quick response service by the professional foreign trade team.
Size inspection report/Raw material certification/Surface treatment report/Engineering drawing
RoHS report/Salt spray test report/Hardness test reort

 

Company Profile

HangZhou Zhong Li Da Machinery Co., Ltd. was founded in 2009, located in HangZhou city, ZheJiang Province, we are a customized precision hardware parts CNC machining manufacturing vendor certified by ISO9001:2015 and IATF16949:2016.

Our production workshop covers an area of 3,500 square meters. We have 6-axis machining center, turning and milling compound center, CNC lathe, automatic lathe and other precision production equipment.

HangZhou Zhong Li Da Machinery is based on the tenet of “technology is the root, quality is the foundation, reputation is the life, service is the belief”,We use innovative manufacturing techniques to produce high-quality products at the lowest achievable cost. 

Detailed Photos

 

 

Certifications

 

Regarding the Precision CNC turning parts , we can meet at:
Roundness & Concentricity:  +/- 0.005mm
Surface Roughness:                 Ra 0.2
Flatness/Parallelism :            0.005mm
Perpendicularity :                    0.005mm
General Tolerance :                 0.001mm

WE COULD ALSO PROVIDE PPAP LEVEL FILES FOR THE AUTO INDUSTRY CUSTOMER!

Packaging & Shipping

 

FAQ

Q: When can I get reply after send inquiry?

A: 1.  All inquiries will be replied within 2 hours on Chinese working time.    

     2. Our call phones standing by any calls at any time.

 
Q: How long can I get samples ?

A: Generally samples can be sent to you within 7 working days after product drawing confirmed by both side.  

 

Q: What file format can you accept for my products/design?

A: 1. We can accept varies format, igs, step, stp, jpg,pdf, dwg, dxf and so on.    
     

Q: If I don’t have drawing, how can I get sample ?

A: If you don’t have any drawing,you can send us your sample, we will scan it and make 2D and 3D drawing first, then make sample for you.

 

Q: What are common materials that you use in projects?  

A: Aluminum,Stainless Steel, Carbon Steel, Copper, Plastics, Titanium and PEEK etc.

 

Q: What’s your MOQ(minimum order quantity)

A: Different products have different MOQs, Welcome to send us trial order firstly.

 

Q: What kind of payment do you accept?

A:  Welcome paid by T/T, L/C, Paypal, Western Union. 

How to use the pulley system

Using a pulley system is a great way to move things around your home, but how do you use a pulley system? Let’s look at the basic equations that describe a pulley system, the types of pulleys, and some safety considerations when using pulleys. Here are some examples. Don’t worry, you’ll find all the information you need in 1 place!
pulley

Basic equations of pulley systems

The pulley system consists of pulleys and chords. When the weight of the load is pulled through the rope, it slides through the groove and ends up on the other side. When the weight moves, the applied force must travel nx distance. The distance is in meters. If there are 4 pulleys, the distance the rope will travel will be 2×24. If there are n pulleys, the distance traveled by the weight will be 2n – 1.
The mechanical advantage of the pulley system increases with distance. The greater the distance over which the force is applied, the greater the leverage of the system. For example, if a set of pulleys is used to lift the load, 1 should be attached to the load and the other to the stand. The load itself does not move. Therefore, the distance between the blocks must be shortened, and the length of the line circulating between the pulleys must be shortened.
Another way to think about the acceleration of a pulley system is to think of ropes and ropes as massless and frictionless. Assuming the rope and pulley are massless, they should have the same magnitude and direction of motion. However, in this case the quality of the string is a variable that is not overdone. Therefore, the tension vector on the block is labeled with the same variable name as the pulley.
The calculation of the pulley system is relatively simple. Five mechanical advantages of the pulley system can be found. This is because the number of ropes supporting the load is equal to the force exerted on the ropes. When the ropes all move in the same direction, they have 2 mechanical advantages. Alternatively, you can use a combination of movable and fixed pulleys to reduce the force.
When calculating forces in a pulley system, you can use Newton’s laws of motion. Newton’s second law deals with acceleration and force. The fourth law tells us that tension and gravity are in equilibrium. This is useful if you need to lift heavy objects. The laws of motion help with calculations and can help you better understand pulley systems.
pulley

Types of pulleys

Different types of pulleys are commonly used for various purposes, including lifting. Some pulleys are flexible, which means they can move freely around a central axis and can change the direction of force. Some are fixed, such as hinges, and are usually used for heavier loads. Others are movable, such as coiled ropes. Whatever the purpose, pulleys are very useful in raising and lowering objects.
Pulleys are common in many different applications, from elevators and cargo lift systems to lights and curtains. They are also used in sewing machine motors and sliding doors. Garage and patio doors are often equipped with pulleys. Rock climbers use a pulley system to climb rocks safely. These pulley systems have different types of pinions that allow them to balance weight and force direction.
The most common type of pulley is the pulley pulley system. The pulley system utilizes mechanical advantages to lift weight. Archimedes is thought to have discovered the pulley around 250 BC. in ancient Sicily. Mesopotamians also used pulleys, they used ropes to lift water and windmills. Pulley systems can even be found at Stonehenge.
Another type of pulley is called a compound pulley. It consists of a set of parallel pulleys that increase the force required to move large objects. This type is most commonly used in rock climbing and sailing, while composite pulleys can also be found in theater curtains. If you’re wondering the difference between these 2 types of pulleys, here’s a quick overview:

Mechanical Advantages of Pulley Systems

Pulley systems offer significant mechanical advantages. The ability of the system to reduce the effort required to lift weights increases with the number of rope loops. This advantage is proportional to the number of loops in the system. If the rope had only 1 loop, then a single weight would require the same amount of force to pull. But by adding extra cycles, the force required will be reduced.
The pulley system has the advantage of changing the direction of the force. This makes it easier to move heavy objects. They come in both fixed and mobile. Pulleys are used in many engineering applications because they can be combined with other mechanisms. If you want to know what a pulley can do, read on! Here are some examples. Therefore, you will understand how they are used in engineering.
Single-acting pulleys do not change direction, but compound pulleys do. Their mechanical advantage is six. The compound pulley system consists of a movable pulley and a fixed pulley. The mechanical advantage of the pulley system increases as the number of movable wheels decreases. So if you have 2 wheels, you need twice as much force to lift the same weight because you need a movable pulley.
The mechanical advantage of a pulley system can be maximized by adding more pulleys or rope lengths. For example, if you have a single pulley system, the mechanical advantage is 1 of the smallest. By using 2 or 3 pulleys, up to 5 times the mechanical advantage can be achieved. You can also gain up to 10 times the mechanical advantage by using multiple pulley systems.
The use of a single movable pulley system also adds to the mechanical advantage of the pulley system. In this case, you don’t have to change the direction of the force to lift the weight. In contrast, a movable pulley system requires you to move the rope farther to generate the same force. Using a compound pulley system allows you to lift heavy loads with ease.
pulley

Safety Issues When Using Pulley Systems

Pulleys have an incredibly unique structure, consisting of a disc with a groove in the middle and a shaft running through it. A rope or cord is attached to 1 end of a pulley that turns when force is applied. The other end of the rope is attached to the load. This mechanical advantage means that it is much easier to pull an object using the pulley system than to lift the same object by hand.
Although pulley systems are a common part of many manufacturing processes, some employers do not train their workers to use them properly or install protection to prevent injury. It is important to wear proper PPE and follow standard laboratory safety practices during pulley system activities. Make sure any support structures are strong enough to handle the weight and weight of the rope or rope. If you do fall, be sure to contact your employer immediately.

China manufacturer Black Zinc Plated CZPT Knurled Fixing Adjustment Thumbscrew Pulley     with Good qualityChina manufacturer Black Zinc Plated CZPT Knurled Fixing Adjustment Thumbscrew Pulley     with Good quality

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