Ore Sand Gravel Pebbles Screen Separation Machine Shaftless Drum Screen

Working Principle:
The working principle of the shaftless drum screen is relatively simple. The material enters the screen drum through the feed port. As the screen drum rotates, the material moves forward along the inner wall of the screen drum under the action of gravity and centrifugal force. During this process, the smaller material will fall through the holes of the screen into the collection tank below, while the larger material will continue to remain in the screen drum and eventually be sent to the discharge port for discharge.

Workflow:
1. The material enters the screen drum evenly through the feed port. The feed port is usually designed to be located at the top of the screen drum to ensure that the material can flow in smoothly and avoid blockage caused by uneven feeding. During the feeding process, the material may pass through a feeding device (such as a vibrating feeder) to ensure uniform distribution of the material.
2. The core part of the shaftless drum screen is the screen drum. The screen drum is driven by an electric motor and rotates continuously. Since there is no central shaft, the screen drum can be more stable when rotating, reducing the vibration of the equipment. This design makes the movement of materials in the screen drum smoother.
3. Material movement and screening: As the screen drum rotates, the material moves forward along the inner wall of the screen drum under the action of gravity and centrifugal force. At this time, the movement of different particle sizes of materials in the screen drum shows different behaviors: Small particle size materials: Smaller particles can fall through the screen holes on the inner wall of the screen drum into the collection tank below. These particles are usually called qualified materials and can pass through the screening smoothly. Large particle size materials: Larger particles cannot pass through the screen and continue to remain in the screen drum. As the screen drum rotates, these particles are eventually sent to the discharge port for discharge, which is called unqualified materials.
4. Screening efficiency and adjustment: The screening efficiency of the shaftless drum screen is related to multiple factors, including the size of the screen hole, the nature of the material, the inclination angle of the screen drum, etc. The operator can adjust the aperture of the screen and the inclination angle of the screen drum according to actual needs to optimize the screening effect.
Screen aperture: The choice of aperture directly affects the particle size classification of screening. Smaller apertures are suitable for screening fine particles, while larger apertures are suitable for screening larger particles.
Inclination angle: The inclination angle of the screen drum is usually set between 5° and 15°. Increasing the inclination angle can increase the flow rate of the material, thereby improving the screening efficiency.
5. Discharging process: After screening, small-size materials fall through the screen and are collected in the collection tank below for subsequent processing or packaging. Large-size materials continue to move forward in the screen drum and are eventually sent to the discharge port. This process ensures efficient grading of materials and reduces resource waste.

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