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Contact
wagner GmbH
Aachener Straße 79
52249 Eschweiler
Fon: +49 (0) 24 03 - 87 74-0
Fax: +49 (0) 24 03 - 87 74-30
often referred to as cryogenous shrinking, is commonly applied for fitting of clindrical components e.g. pins, shafts or bushes. The method is based on the physical priciple that metals will shrink by a drop of the temperature and will expand by applying heat. The same physics apply when cryogenous tensioning is used for a force fit connection of different components. Depending on the properties of the materials used and the interference of the components to be force fitted, the connection between the fitted components is determined, this limits the transmittable torque. In practise the shaft (force fit) is cooled down by bathing it in liquified nitrogene. During the cooling stage it needs to be covered entirely by nitrogene. The process of cooling down lasts until the boiling nitrogene has calmed down, which occurs when the temperature of shaft and nitrogene is equal. About 130 minutes later the diameter of the shaft has diminished to a minimum size and so it fits into the bore of the idler. The required force fit of the components is achieved by appling heat.
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| Manufacturer | wagner GmbH, Eschweiler, Deutschland | ||
| Application | Drive unit of a rotary kiln | ||
| Diameter of idler | 2000 mm | ||
| Width of idler | 1100 mm | ||
| Material specification of idler | Ck 45 | ||
| Weight of idler | 2300000 N | ||
| Diameter of shaft | 780 mm | ||
| Length of shaft | 3300 mm | ||
| Material specification of shaft | Ck 45 | ||
| Weight of shaft | 91500 N | ||
| Diameter at collar | 850 mm | ||
| Width of collar | 750 mm | ||
| Material specification of collar | St 50-2N | ||
| Weight of collar | 6200 N | ||
| Fit between shaft and idler | H7/u7 | ||
| Reduction of diameter by cooling process | 1,4 mm | ||
| Coolant | liquid nitrogene | ||
| Volume of coolant applied | 7100 l | ||
| Cooling process time | 130 min | ||
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Cryotechnical plants are used in laboratories, reseach, medicine and biology. They serve the purpose of stocking biogeneous material. For example: stem cells, bone marrow, concentrated erythrocytes, homograft , skin tissue, blood units, cytological cultures, ovulars etc. that require specific conditions when being kept in stock. These refrigerators (Fig.2) are filled with liquified nitrogene, and a control maintains a constant temperature of the content in a range of + 40 to –180 centigrades.
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In order to control the temperature level of the refrigerator, there is a constant supply of liquified nitrogene through reserve tanks. These reserve tanks get frequently refilled by us in order to guarantee an uninterrupted operation of the refrigerator, thus to maintain the probes.
In case you are interested in our nitrogene supplies, in buying reserve tanks or should you have any queries,
our Service Engineer is always at your disposal.
D. Montag
Fon: 02403/8774 –44,
Fax: 02403/8774 – 30 or
E–Mail:
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