Vacuum Rake Dryer

I. Working Principle

 The vacuum耙式drier is mainly composed of the housing, rotating shaft, and rake teeth. Unlike the浆叶式drier, The rotary shaft and rakes of the vacuum耙式干燥机 do not serve as heating surfaces; they are solely for agitating the material and refreshing the surface. The rake dryer operates under vacuum, first adding wet material to the dryer, then introducing heating medium (usually steam or hot water; thermal oil can also be used) into the jacket. Subsequently, the vacuum pump is activated, and once the specified vacuum level is achieved, the agitator is turned on. The forward and reverse rotation of the rakes continuously pushes the material towards the center and ends during the drying process. Additionally, between the rakes, items can be placed according to the customer's requirements.4seamless stainless steel rod (hollow section pipe), which continuously moves up and down during the rotation of the shaft, to vibrate and agglomerate the material adhering to the wall and to crush caked material. These measures ensure timely renewal of the heat transfer surface, thereby accelerating the rate of heat and mass transfer. When the material is dried to the specified moisture content, heat is stopped, the vacuum system is closed, the dried material is removed, and the cycle is completed. This dryer is suitable for the drying of pasty, paste-like, granular, and fibrous materials, particularly for heat-sensitive materials and for drying operations requiring the recovery of organic vapors, where the vacuum rake dryer offers numerous advantages. The rake teeth of the vacuum rake dryer come in two basic forms: left- and right-oriented, with both having atypical and paste-like shapes. During installation, the spacing between adjacent rake teeth is90The shaft features non-standard tines at both ends and paddle-type tines elsewhere. As the shaft rotates, the material is moved to the sides by the stirrer shaft, and then back to the center, ensuring uniform mixing throughout the drying process.

Vacuum耙式driers commonly use a drying medium such as...0.1—0.3MpaSteam, thermal oil, or hot water,Vacuum level inside the desiccator50—90kPa,Material filling rate30%--80%,Thermal efficiency70%--80%.The shaft's rotational speed is6—30rpmContinuous variable speed control.

II. Features

This unit utilizes simultaneous interlayer and internal stirring heating, featuring a large heat transfer surface and high thermal efficiency.

②The machine is set to stir, creating a continuous circulation state for the material, which further enhances the evenness of material heating.

③The machine is equipped with stirring to ensure smooth drying of pasty, creamy, and paste-like materials.