[ Ссылка ] - In this production by the Columbus McKinnon Corporation, you will be presented with the proper care, use, and inspection procedures that will enable you to find that weak link, and help prevent unsafe operating conditions in your plant.
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The following is a production of Columbus McKinnon Corporation.
We really don’t know who coined the expression, “A chain is as strong as its weakest link.” Whoever it was, that person couldn’t have said it better.
The need to comply with the legal requirements of the Occupational Safety and Health Act (OSHA) now makes an in-plant chain inspection program more important than ever. The simple, but thorough, inspection procedures recommended in this program for sling chain and attachments will together, with adequate records, ensure that reliable components are being used and provide documentary evidence of that fact to visiting OSHA inspectors.
Let’s begin by listing the conditions that will cause a chain to fail. The inspector should look for wear, nicks and gouges, localized bending, shearing, and stretch. With only these few items to detect, the job is really very simple.
Wear can occur in any portion of a link that is subject to rubbing contact with another surface. A quick look at a strand of chain reveals that the natural shape of the link confines wear to only two areas. These critical areas are at the bearing point of interlink contact and on the outside of the straight side barrel. Side barrel wear is usually a result of the chain being dragged along hard surfaces or out from under loads. Interlink wear can easily be detected by collapsing the chain to separate each length from its neighbors. Once wear has been observed, the question arises as to whether the amount is tolerable. This question can be resolved quickly by making a caliper measurement across the worn section and comparing this with the minimal allowable dimension. Those giving minimum section dimensions or wear allowances are published by all major chain manufacturers.
Nicks and gouges, in most cases, occur on the straight barrels rather than on the ends. Since they are usually located in surfaces under compressive stress, their potentially harmful effects are reduced. At this time we should note that the unique geometry of a chain link tends to protect tensile stress areas against damage from external causes. These tensile stress areas are on the outside of the link body at the link ends where they are shielded against most damage by the presence of interconnected links. Tensile stress areas are also located on the insides of the straight barrels, but these surfaces are sheltered by their location.
Gouges are stress concentration factors. Deep gouges can be harmful, especially if they happen to be located in the areas of tensile stress and particularly if they are perpendicular to the direction of stress. The location of nicks and gouges will dictate their seriousness. But it is suggested, however, that all nicks and gouges be filed or ground out.
A stress chain link can occur from overloading. This condition results in the scrapping of more chain than all other causes combined. Stretching therefore deserves the careful consideration of safety personnel and chain inspectors.
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