Chain/Sprocket, Raised Floor System, Building Constructional Component
Chain/Sprocket, Raised Floor System, Building Constructional Component
| カテゴリ内リンク | カテゴリ内リンク | カテゴリ内リンク |
|---|---|---|
| Attachment | Cutting and Joining | Lubrication (Oiling) |
| カテゴリ内リンク | カテゴリ内リンク | カテゴリ内リンク |
| Maintainance andInspection | Identifying and Correcting Problems | |
| カテゴリ内リンク | カテゴリ内リンク | カテゴリ内リンク |
Maintenance and Inspection |
|---|
Chain components wear as they are used, and the degree of wear can be used as a guideline for when to replace a chain.
The undersides of link plates are worn down by contact with the load and casing. Wear is also caused by contact between inner and outer link plates, and between the inner face of the inner links and the sides of the rollers.
Chains flex where they mesh with sprockets, causing sliding wear between pins and bushings, which leads to pitch extension.
Roller wear
R type and F type rollers suffer increasing frictional
resistance against the link plates and rails as their wear increases, increasing chain tension. That situation should be the guideline for replacement.
For S type rollers, the limit of use is reached when the roller becomes pitted or cracked.
How to measure chain length
With long-term use, wear to chain pins and bushes
causes the chain to lengthen, so that it runs poorly on the sprockets. Therefore, the guideline for replacement is when pitch extension reaches 2~3% of the standard dimension.
Measure chain length across four or more links, as
shown in the diagram on the right.
Sprocket wear
As sprocket wear progresses, it reaches the state
shown in the diagram on the right, which causes the chain rollers to catch in area (A), so that it tends to wind around the roller (chain separates poorly from the sprocket). Wear at the base of the tooth varies with the size and speed of the chain, but the sprocket should be replaced or repaired when wear reaches 3~10mm.
