Here.Designed using chains The selection point in the "List of RS chain pitches and allowable tensionI'm making a note of the "I'm not sure what I'm doing.
Recently, we were working on a design project for a device that utilizes multiple RS chains. It was time-consuming to check the chains, so we made a list of the chain pitches and allowable tensions.
Check the chain
The final check for a design using chains is whether the chain pitch is correct and whether the chain has sufficient capacity? I think there are two points.
Check chain pitch
Checking the chain pitch is simply necessary to determine the number of links to purchase. It is important to note that the configuration of links in a chain changes between even and odd numbers, and the part number to be purchased will also change.
In the catalog, if a device uses multiple chains, it is very time-consuming to reopen the page each time it is checked. Also, as mentioned earlier, if the number of links is incorrect, the arranged chains may not be attached properly, and additional links may have to be purchased by purchasing offset links, which can be a bit troublesome.
A final check should reconfirm the correct chain picture and number of links.
Maximum allowable chain tension
This is a common concern for design novices, and the chain may have four strength expressions on it in catalogs.
- JIS minimum tensile strength
- Average Tensile Strength
- Minimum Tensile Strength
- Max. allowable tension
Failure to understand the meaning of these words and phrases regarding chain strength can result in a dangerous design. Chains have many uses, especially for hanging things, and in case of a serious accident, beginners should be especially careful.
The four strength words and phrases of the chain have the following meanings
JIS minimum tensile strength
Minimum tensile strength (tensile rupture strength) specified by JIS standard
Average Tensile Strength
Average tensile strength (different for each manufacturer)
Minimum Tensile Strength
Strength at which the product is rejected when subjected to tensile rupture by the manufacturer
Max. allowable tension
No fracture occurs under repeated loading as long as the load is less than the maximum allowable tension
In essence, it is this "maximum allowable tension" that the design must satisfy.The reason why strength is checked in the final check is that as the design progresses, the number of structures increases, and in many cases, the weight increases unexpectedly.
When lifting objects, the load is considerably increased by the increased weight of the object to be lifted, and changing the lifting speed (rapid acceleration) is also a significant load on the chain. It is better to check just to be sure.
Excel sheet for checking
Here is the "RS Chain Pitch and Allowable Tension List" that I have found useful in my work. It is surprisingly easy to read. Please use it.
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Chain Usage in Machine Design [Selection, Calculation, and Placement to Extend Life].
Here we note the "basics that designers should keep in mind about chains," a mechanical element that has been used in automatic machines for a long time. Chain usage" is an extremely important factor that determines the reliability of equipment ...
See more.
That's it.