First, the principle of fluidized bed dryer: The material enters the machine from the feed inlet. Under the action of vibration force, the material is thrown in the horizontal direction and moves forward continuously. The hot air passes through the fluidized bed and exchanges heat with the wet material. After the humid air is removed by the cyclone separator, it is discharged by the air outlet, and the dry material is discharged by the air outlet. Second, the scope of application of pharmaceutical and chemical: a variety of tablet granulation, boric acid, borax, benzenediol, malic acid, maleic acid and so on. Food and building materials: distiller's grains, monosodium glutamate, sugar, salt, slag, watercress, seeds, etc. It can also be used for cooling, humidifying, etc. of materials. Third, the characteristics 1, the material is evenly heated, heat exchange is sufficient, the drying strength is high, about 30% energy saving than ordinary dryer 2, the vibration source is driven by vibration motor, running balance, convenient maintenance, low noise, long life 3, fluid state Stable, no dead angle and blow through phenomenon 4, good adjustability, wide adaptability, thickness of the material layer and movement speed and amplitude change in the machine can achieve stepless adjustment 5, the surface damage to the material is small. It can be used for fragile drying. When the material particles are irregular, it will not affect the working effect. 6. The fully enclosed structure is adopted to effectively prevent cross-contamination between materials and air, and the working environment is clean. 4. Classification of fluidized bed dryers 1. According to the materials to be dried, they can be divided into: granular materials, paste materials, suspensions, solutions, etc. with fluid materials. 2. According to the operation, they can be divided into batch type and continuous type. According to the structure of the equipment, it can be divided into: single-layer fluidized bed dryer, multi-layer fluidized bed dryer, horizontal multi-chamber fluidized bed dryer, vibrating fluidized bed dryer, pulse fluidized bed dryer, etc.