Product Description
Double Pitch Conveyor Chains
| ISO Chain No. | ANSI Chain No. | Pitch P mm |
Roller diameter d1max mm |
Width between inner plates b1min mm |
Pin diameter d2 max mm |
Pin length | Inner plate depth h2 max mm |
Plate thickness T max mm |
Tensile strength Q min kN/lbf |
Average tensile strength Q0 kN |
Weight per meter q kg/m |
|
| Lmax mm | Lcmax mm | |||||||||||
| C208AH | C2040H | 25.4 | 7.95 | 7.85 | 3.96 | 18.8 | 19.9 | 12 | 2.03 | 14.1/3205 | 17.2 | 0.65 |
| C208AHL | C2042H | 15.88 | 1.00 | |||||||||
CONVEYOR CHAIN DESIGNED AND MANUFACTURED FOR THE MOST DEMXIHU (WEST LAKE) DIS. OF ENVIRONMENTS
HangZhou Star Machine Technology Co.,ltd. provides the highest quality materials and manufacturing methods to suit the most arduous of conveyor chain applications – from the transport of biomass fuels, to the recycling industry, paper & pulp, cement, steel-work, the wood industry and food processing.
Our conveyor chains, sprocket wheels and attachments are case-hardened to achieve the optimum balance between strength, durability and resistance to wear.
Our manufacturing is focused on metric pitch conveyor chains that include:
International Standards DIN 8167/ISO 1977 M series
DIN 8165/ISO 1977 FV series
SMS 1968 S series
CONSTRUCTION OF THE CHAIN
Two different sizes of roller chain, showing construction.
There are 2 types of links alternating in the bush roller chain. The first type is inner links, having 2 inner plates held together by 2 sleeves or bushings CHINAMFG which rotate 2 rollers. Inner links alternate with the second type, the outer links, consisting of 2 outer plates held together by pins passing through the bushings of the inner links. The “bushingless” roller chain is similar in operation though not in construction; instead of separate bushings or sleeves holding the inner plates together, the plate has a tube stamped into it protruding from the hole which serves the same purpose. This has the advantage of removing 1 step in assembly of the chain.
VARIANTS DESIGN
Layout of a roller chain: 1. Outer plate, 2. Inner plate, 3. Pin, 4. Bushing, 5. Roller
If the chain is not being used for a high wear application (for instance if it is just transmitting motion from a hand-operated lever to a control shaft on a machine, or a sliding door on an oven), then 1 of the simpler types of chain may still be used. Conversely, where extra strength but the smooth drive of a smaller pitch is required, the chain may be “siamesed”; instead of just 2 rows of plates on the outer sides of the chain, there may be 3 (“duplex”), 4 (“triplex”), or more rows of plates running parallel, with bushings and rollers between each adjacent pair, and the same number of rows of teeth running in parallel on the sprockets to match. Timing chains on automotive engines, for example, typically have multiple rows of plates called strands.
USE
An example of 2 ‘ghost’ sprockets tensioning a triplex roller chain system
Roller chains are used in low- to mid-speed drives at around 600 to 800 feet per minute; however, at higher speeds, around 2,000 to 3,000 feet per minute, V-belts are normally used due to wear and noise issues.
A bicycle chain is a form of roller chain. Bicycle chains may have a master link, or may require a chain tool for removal and installation. A similar but larger and thus stronger chain is used on most motorcycles although it is sometimes replaced by either a toothed belt or a shaft drive, which offer lower noise level and fewer maintenance requirements.
The great majority of automobile engines use roller chains to drive the camshaft(s). Very high performance engines often use gear drive, and starting in the early 1960s toothed belts were used by some manufacturers.
Chains are also used in forklifts using hydraulic rams as a pulley to raise and lower the carriage; however, these chains are not considered roller chains, but are classified as lift or leaf chains.
Chainsaw cutting chains superficially resemble roller chains but are more closely related to leaf chains. They are driven by projecting drive links which also serve to locate the chain CHINAMFG the bar.
Sea Harrier FA.2 ZA195 front (cold) vector thrust nozzle – the nozzle is rotated by a chain drive from an air motor
A perhaps unusual use of a pair of motorcycle chains is in the Harrier Jump Jet, where a chain drive from an air motor is used to rotate the movable engine nozzles, allowing them to be pointed downwards for hovering flight, or to the rear for normal CHINAMFG flight, a system known as Thrust
WEAR
The effect of wear on a roller chain is to increase the pitch (spacing of the links), causing the chain to grow longer. Note that this is due to wear at the pivoting pins and bushes, not from actual stretching of the metal (as does happen to some flexible steel components such as the hand-brake cable of a motor vehicle).
With modern chains it is unusual for a chain (other than that of a bicycle) to wear until it breaks, since a worn chain leads to the rapid onset of wear on the teeth of the sprockets, with ultimate failure being the loss of all the teeth on the sprocket. The sprockets (in particular the smaller of the two) suffer a grinding motion that puts a characteristic hook shape into the driven face of the teeth. (This effect is made worse by a chain improperly tensioned, but is unavoidable no matter what care is taken). The worn teeth (and chain) no longer provides smooth transmission of power and this may become evident from the noise, the vibration or (in car engines using a timing chain) the variation in ignition timing seen with a timing light. Both sprockets and chain should be replaced in these cases, since a new chain on worn sprockets will not last long. However, in less severe cases it may be possible to save the larger of the 2 sprockets, since it is always the smaller 1 that suffers the most wear. Only in very light-weight applications such as a bicycle, or in extreme cases of improper tension, will the chain normally jump off the sprockets.
In industry, it is usual to monitor the movement of the chain tensioner (whether manual or automatic) or the exact length of a drive chain (one rule of thumb is to replace a roller chain which has elongated 3% on an adjustable drive or 1.5% on a fixed-center drive). A simpler method, particularly suitable for the cycle or motorcycle user, is to attempt to pull the chain away from the larger of the 2 sprockets, whilst ensuring the chain is taut. Any significant movement (e.g. making it possible to see through a gap) probably indicates a chain worn up to and beyond the limit. Sprocket damage will result if the problem is ignored. Sprocket wear cancels this effect, and may mask chain wear.
CHAIN STRENGTH
The most common measure of roller chain’s strength is tensile strength. Tensile strength represents how much load a chain can withstand under a one-time load before breaking. Just as important as tensile strength is a chain’s fatigue strength. The critical factors in a chain’s fatigue strength is the quality of steel used to manufacture the chain, the heat treatment of the chain components, the quality of the pitch hole fabrication of the linkplates, and the type of shot plus the intensity of shot peen coverage on the linkplates. Other factors can include the thickness of the linkplates and the design (contour) of the linkplates. The rule of thumb for roller chain operating on a continuous drive is for the chain load to not exceed a mere 1/6 or 1/9 of the chain’s tensile strength, depending on the type of master links used (press-fit vs. slip-fit)[citation needed]. Roller chains operating on a continuous drive beyond these thresholds can and typically do fail prematurely via linkplate fatigue failure.
The standard minimum ultimate strength of the ANSI 29.1 steel chain is 12,500 x (pitch, in inches)2. X-ring and O-Ring chains greatly decrease wear by means of internal lubricants, increasing chain life. The internal lubrication is inserted by means of a vacuum when riveting the chain together.
CHAIN STHangZhouRDS
Standards organizations (such as ANSI and ISO) maintain standards for design, dimensions, and interchangeability of transmission chains. For example, the following Table shows data from ANSI standard B29.1-2011 (Precision Power Transmission Roller Chains, Attachments, and Sprockets) developed by the American Society of Mechanical Engineers (ASME). See the references for additonal information.
ASME/ANSI B29.1-2011 Roller Chain Standard SizesSizePitchMaximum Roller DiameterMinimum Ultimate Tensile StrengthMeasuring Load25.
For mnemonic purposes, below is another presentation of key dimensions from the same standard, expressed in fractions of an inch (which was part of the thinking behind the choice of preferred numbers in the ANSI standard):
WHY CHOOSE US
1. Reliable Quality Assurance System
2. Cutting-Edge Computer-Controlled CNC Machines
3. Bespoke Solutions from Highly Experienced Specialists
4. Customization and OEM Available for Specific Application
5. Extensive Inventory of Spare Parts and Accessories
6. Well-Developed CHINAMFG Marketing Network
7. Efficient After-Sale Service System
We are not just a manufacturer and supplier, but also an industry consultant. We work pro-actively with you to offer expert advice and product recommendations in order to end up with a most cost effective product available for your specific application. The clients we serve CHINAMFG range from end users to distributors and OEMs. Our OEM replacements can be substituted wherever necessary and suitable for both repair and new assemblies.
| Standard or Nonstandard: | Standard |
|---|---|
| Application: | Textile Machinery, Garment Machinery, Conveyer Equipment, Packaging Machinery, Electric Cars, Motorcycle, Food Machinery, Marine, Mining Equipment, Agricultural Machinery, Car, Food and Beverage Industry, Motorcycle Parts |
| Surface Treatment: | Polishing, Polishing |
| Structure: | Roller Chain, Roller Chain |
| Material: | Alloy, Alloy |
| Type: | Double Pitch Chain |
| Samples: |
US$ 0/Meter
1 Meter(Min.Order) | |
|---|
| Customization: |
Available
| Customized Request |
|---|
What are the benefits of using a double chain over other power transmission methods?
Double chains offer several advantages over other power transmission methods, making them a popular choice in various industrial applications:
- High Load Capacity: Double chains are designed to handle heavy loads and high torque transmission, making them suitable for demanding applications where power needs to be efficiently transferred.
- Durability: The construction of double chains using high-quality materials and precision manufacturing results in excellent durability and resistance to wear and fatigue, leading to longer service life.
- Wide Range of Sizes: Double chains are available in various sizes, pitches, and configurations, offering flexibility in designing power transmission systems to meet specific application requirements.
- Cost-Effective: Compared to some other power transmission methods, double chains are often more cost-effective, making them an attractive choice for budget-conscious applications.
- Simple Installation: Installing double chains is relatively straightforward, and they can be easily maintained or replaced when necessary, contributing to reduced downtime and increased productivity.
- High Efficiency: Double chains provide efficient power transmission with minimal energy losses, making them an energy-efficient option for various industrial processes.
- Wide Application Range: Double chains are versatile and find applications in numerous industries, including automotive, agriculture, manufacturing, mining, and more.
- Shock Load Absorption: Double chains can handle sudden shock loads or impact forces, thanks to their robust construction and ability to distribute the load evenly.
Overall, the combination of high load capacity, durability, cost-effectiveness, and efficiency makes double chains a reliable choice for power transmission in a wide range of industrial equipment and machinery.
What are the limitations of using double chains in certain applications?
While double chains offer many advantages, there are some limitations to consider when using them in certain applications:
- Space Constraints: Double chains require a larger pitch compared to standard roller chains, which means they may not be suitable for applications with limited space or tight clearances.
- Weight: Double chains are typically heavier than their single-chain counterparts. In applications where weight reduction is critical, double chains may not be the ideal choice.
- Cost: Double chains are generally more expensive than standard roller chains due to their increased size and material requirements. This cost factor should be considered when selecting a chain for an application.
- Installation Complexity: Due to their larger size and additional strands, installing and aligning double chains can be more challenging and time-consuming compared to single chains.
- Operational Speed: Double chains may not be suitable for very high-speed applications where centrifugal forces and dynamic stresses can impact their performance and reliability.
- Specialized Sprockets: Double chains often require specially designed sprockets to accommodate their larger size and pitch. Availability and compatibility of these sprockets may vary depending on the application.
It’s important to carefully evaluate the specific requirements and constraints of the application when considering the use of double chains. While they offer increased load capacity and durability, their limitations related to space, weight, cost, installation complexity, operational speed, and specialized sprockets should be taken into account to ensure the best chain selection for the intended application.
Can double chains be used in high-speed applications?
Yes, double chains can be used in high-speed applications, but there are certain considerations to keep in mind to ensure their safe and efficient operation.
When using double chains in high-speed applications, it is important to select a chain that is specifically designed and rated for high-speed operation. High-speed chains are typically manufactured with precision and high-quality materials to withstand the stresses and forces experienced at elevated speeds.
Here are some key factors to consider when using double chains in high-speed applications:
- Chain Type: Choose a double chain type that is suitable for high-speed operation. Certain chain designs, such as those with lightweight construction and optimized profiles, are specifically engineered for high-speed applications.
- Material Selection: Consider using double chains made from high-strength and wear-resistant materials. These materials can withstand the higher forces and reduce the risk of wear and fatigue at high speeds.
- Lubrication: Proper lubrication is crucial for high-speed chain operation. Use lubricants that are specifically designed for high-speed applications and ensure that the chain is adequately lubricated to minimize friction and heat generation.
- Tension and Preload: Maintain proper tension and preload in the double chain to ensure smooth engagement with the sprockets. Proper tensioning helps prevent excessive vibration, noise, and premature wear at high speeds.
- Bearing Support: Ensure that the chain is properly supported by high-quality bearings and sprockets designed for high-speed operation. The bearings should be able to handle the increased rotational speeds and provide smooth motion.
- Alignment and Balance: Proper alignment of the chain and sprockets is critical for high-speed applications. Misalignment can lead to increased wear, vibration, and potential chain derailment. Ensure the sprockets are aligned and balanced to minimize any unwanted forces on the chain.
- Regular Inspection and Maintenance: Regularly inspect the double chain for signs of wear, fatigue, or damage. Perform routine maintenance tasks such as lubrication, tension adjustment, and replacing worn-out components to ensure the chain’s reliable performance at high speeds.
It is important to consult the manufacturer’s guidelines and specifications for the specific double chain type and application requirements. Additionally, working with experienced engineers or chain suppliers can provide valuable insights and assistance in selecting the appropriate double chain for high-speed applications.
editor by CX 2023-09-22