The vacuum rake dryer mainly consists of a shell, a rotating shaft, and rake teeth. Unlike blade dryers, the rotating shaft and rake teeth of vacuum rake dryers do not serve as heating surfaces, but only serve to stir materials and update surfaces. The rake dryer is vacuum operated. Firstly, wet materials are added to the dryer, and heating medium (usually steam or hot water can also be used as thermal oil) is introduced into the jacket. Then, the vacuum pump is started to reach the specified vacuum degree, and the mixing device is started. Using the forward and reverse rotation of the rake teeth, the material is continuously pushed towards the middle and both ends during the drying process. At the same time, four stainless steel rods (seamless steel pipes) can also be placed between the rake teeth according to user requirements. It continuously moves up and down during the rotation of the shaft, vibrates the material adhered to the wall of the dryer, and crushes the agglomerated material. Through these measures, timely updates of the heat transfer surface can be ensured, thereby accelerating the rate of heat and mass transfer. When the material is dried to the specified moisture content, stop heating, turn off the vacuum system, take out the dried material, and complete one cycle of operation. This type of dryer is suitable for drying slurry, paste, granular, and fibrous materials, especially for thermosensitive materials and drying operations that require the recovery of organic vapor. The vacuum rake dryer has many advantages. There are two basic forms of rake teeth for vacuum rake dryers: left and right. There are two types: irregular and blade shaped. When installing, adjacent rake teeth have a 90 degree difference in orientation, and irregular rake teeth are installed at both ends of the shaft, while blade shaped rake teeth are installed for the rest. When the shaft rotates, the material moves to both sides first and then to the middle under the action of the mixing shaft, which ensures that the material remains in a uniform mixing state throughout the entire drying process.