2. Supporting Frame: The hollow cylinders are mounted on a sturdy supporting frame. This frame ensures the stability and proper alignment of the drum dryer.

3. Product Feeding System: The material to be dried is fed into the drum through a product feeding system. This system can vary depending on the specific requirements of the drying process and the characteristics of the material being dried.

4. Scraper: Inside the drum, there is a scraping mechanism. This mechanism is often composed of scraping blades or paddles that are attached to the interior walls of the drum. As the drum rotates, these scrapers continuously move the material around, preventing it from sticking to the drum's surface. This movement promotes even drying and efficient heat transfer.

5. Auxiliaries: Various auxiliary components are incorporated to support the drum dryer's operation and enhance its efficiency.

These can include:
* Heating System: A heat source (like steam, hot oil, or direct flame) is used to provide the necessary thermal energy for drying the material. The heat is applied to the outer surface of the drum, and it travels through the drum's walls to reach the material inside.
* Exhaust System: An exhaust system helps remove the evaporated moisture and any volatile substances from the drying chamber.
* Control System: A control system monitors and regulates parameters such as temperature, drum speed, and airflow to ensure optimal drying conditions and prevent overheating or under-drying.
* Drive Mechanism: A motor and drive mechanism rotate the drum at the desired speed, controlling the movement of the material and the scrapers inside.
* Discharge System: Once the material is dried, it exits the drum through a discharge system, which can include chutes, conveyors, or other mechanisms.
* Safety Features: Drum dryers are equipped with safety features to prevent overheating, ensure proper ventilation, and protect against potential hazards.
Drum dryers are widely used in various industries for drying a wide range of materials, including food products, chemicals, pharmaceuticals, minerals, and more. Their design and components contribute to efficient and controlled drying processes.