| 摘要 |
A device for coating granular solids has a rotary drum and a casing or housing air-tightly housing the rotary drum. The space between the rotary drum and the casing is divided by sealing means into a gas supply passage and a gas exhaust passage which in turn are communicated with a gas supply duct and a gas exhaust duct, respectively. The rotary drum is of a double-cone structure consisting of a cylindrical section and frustoconical side walls, and the cylindrical section consists of a plurality of circumferentially arcuated louvers overlapped one upon another and radially spaced apart from each other at a suitable distance to define gas passages between the interior and exterior of the rotary drum. The circumferential length of each louver and the spacing therebetween are so determined that upon rotation of the rotary drum in one or processing direction the discharge of process solids through the louver passages may be prevented whereas upon rotation in the other or discharge direction the coated solids may be automatically discharged out of the rotary drum through the louver passages. One of the side walls is formed with an inspection and batch charging opening, and no component part such as a coating material supply pipe is placed in the space communicating between the opening and the interior of the rotary drum so that the inspection, maintenance and adjustments of the device and the charging of process solids may be facilitated. |
