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Which bearings are commonly used in food machinery? Introduction to bearings for food machinery
Since the final product of food machinery is to be eaten by humans, the most basic requirement of food machinery is safety. At the same time, the food produced cannot be dyed by other objects, and corrosive wastewater will be generated during food production. Anti-corrosion ability is also a very important part. Therefore, bearings for food machinery must have at least three basic points, namely, safety, no oil leakage and anti-corrosion.
In food machinery, food machinery-specific lubricating greases that meet NSF (National Sanitation Foundation) H1 standards and FDA (Food and Drug Administration) standards are often used, and generally use solid grease, which is not easy to leak , generally urea-based-synthetic oil lubricants, solidified by adding ultra-high molecular polyethylene thickeners, details about lubricants, thickeners, and additives.
The suffix codes of special grease for food machinery are /LP09 and /L719, which should be specially marked when purchasing bearings to prevent purchasing errors.
In addition to grease, stainless steel and plastic bearings and housings are commonly used in food machinery. Stainless steel bearings are not easy to rust, so they are more resistant to acid and alkali corrosion. In addition to acid and alkali resistance, plastic materials are more resistant to water, but plastic bearings are relatively Compared with stainless steel bearings, the bearing capacity is relatively weaker, so the specific selection needs to be "adapted to local conditions" and "used in accordance with conditions".
In addition to the above-mentioned stainless steel and plastic bearings and housings, synthetic resin sliding bearings are often used in food machinery. Resin sliding bearings have good self-lubricating effects, and because they are not filled with grease, there is no possibility of leakage. They are often used in high-temperature environments (lubrication) The extreme high temperature of grease is about 100 degrees, and the resin sliding bearing can withstand the high temperature of 300 degrees), such as high temperature sterilization equipment.
In medium and high temperature environments, resin ceramic rolling element bearings are also commonly used. The heat resistance is slightly lower than that of resin sliding bearings (about 200 degrees), but rolling bearings are stronger than sliding bearings in terms of speed and reliability. About rolling bearings and sliding bearings
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