The vacuum rake dryer belongs to a type of vacuum drying equipment. At present, vacuum drying equipment has evolved into various forms, such as double cone rotary vacuum drying equipment, column mixing vacuum drying equipment, and vacuum disc drying equipment. The uniqueness of the vacuum rake dryer lies in the setting of a rake type mixing device, which continuously rotates and stirs inside the drum, making the material more evenly heated. Therefore, it is widely used for drying pulp, mud, viscous food materials, etc. However, similarly, this type of rake type mixing device limits the vacuum rake dryer to only be suitable for drying materials below 100 mesh. After the wet material enters the vacuum rake dryer, the toothed rake begins to rotate continuously in both directions to maintain mixing, promoting continuous innovation in the surface of the material that comes into contact with the inner cavity. After the surface of the food material is heated by steam, the moisture will vaporize and be discharged through dry testing dust removal equipment, wet electrostatic precipitators, coolers and other machinery and equipment; Due to the difference in environmental humidity components between the inside and outside of the ingredients, they may be released along the ingredients towards the surface, thus maintaining the entire process of gasification and emission, and keeping the ingredients dry and rough. In order to deal with the problem of material clumping caused by uneven dryness and agitation, the vacuum rake dryer is equipped with a crushing rod to reduce material clumping based on the interaction between the crushing rod and the rake mixing device.

The entire process of drying is under vacuum, and the water content does not need to exceed 100 ℃ before the gasification step can be carried out. This significantly reduces the required drying temperature of the material, which is beneficial for the preservation of thermistor components in food products and can retain a large amount of nutrients. In addition, this type of high vacuum represents excellent airtightness and has advantages for some food ingredients that are prone to air oxidation and their vaporized vapor will cause serious damage to the natural environment. When garlic is made into dehydrated garlic, the water with high yield contains chemicals such as sugar content and alliin, which causes significant environmental pollution. The vacuum rake dryer reduces the probability of organic waste gas flowing out, and collecting sewage is beneficial for solving the problem.

To further improve the efficiency of drying, the vacuum rake dryer not only has a heating device mixed inside, but also the interlayer can maintain additional heating, greatly increasing the total heat conduction area and enhancing thermal efficiency. Generally speaking, a vacuum rake dryer requires steam to enter the insulation layer to keep it hot. This treatment process requires the steam to be heated within a small range, while also maintaining a certain level of environmental protection and energy conservation while maintaining rapid heating.