Various materials are widely used in food machinery and equipment. In addition to various metal materials and alloy materials, there are wood, stone, emery, ceramics, enamel, glass, textiles, and various organic synthetic materials. The technological conditions of food production are quite complex, and have different requirements for materials. It is necessary to master the various properties of materials in order to make the right choice and make the right choice, so as to obtain good results and economic benefits.
Food machinery and equipment are in contact with various media under various conditions during the production process. In order to prevent food from being contaminated during these contacts and for the equipment to be used for a long time, there is a great deal of attention to food machinery materials. Because it is related to food safety and people's health.
Half of the food machinery and equipment are light machinery and equipment, and most of the components are under less stress. However, due to the requirements of light machinery and equipment to reduce the weight and volume of the machine as much as possible, and the size of the components should be as small as possible, so the mechanical performance requirements of the material do not reduce in addition to strength, rigidity and hardness, there are some other requirements. For example, in food machinery and equipment, there are many opportunities to process large quantities of finished items. Therefore, high-speed reciprocating components are often encountered, and the performance of the parts is required from fatigue strength.
Some parts in food machinery and equipment are often in contact with a large amount of materials, and when contacted, different materials will cause different damage to the parts. For example, the high-speed impact of the hammer piece with a hard material will cause strong wear. Therefore, the hammer piece has high requirements on the wear resistance of the material. The speed of the relative movement of the screw and sleeve of the food extruder and the material is not high, but the working pressure is as high as 200MPa, and the working temperature is also as high as 200 ° C. Therefore, such machinery not only requires high torsional strength, but also has Wear resistance and high creep resistance.
Some food machinery and equipment work at high temperature (such as baking machinery) or at low temperature (such as freezing machinery, the temperature can reach about -40 ℃, the working temperature of freezing machinery using liquid nitrogen as the medium will be lower). It is necessary to consider the performance of the materials of mechanical equipment at high and low temperatures.
The process conditions of food production are quite complex, so food machinery has high and extremely complex requirements for materials. Therefore, it is necessary to grasp the various properties of materials, so that the correct choice can be made and the correct choice can be made in the selection of food machinery and equipment. Choice to obtain the best use effect and the most economic benefits. Commonly used in soy sauce tanks, cooking wine, salt tanks, equipment and dressing food machinery, as well as food processing equipment, salt extraction equipment, etc.
Special alloy materials commonly used in the food industry:
·stainless steel: 316LN, 317L, 317LMN, 254SMO, 904L and other
·nickel-based alloys: Incoloy800HT, Incoloy825, Nickel 201, N6, Nickel 200 and other
·corrosion-resistant alloys: NS112