Classification:

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The automatic small flour processing machinery is designed to efficiently handle the production of flour from raw materials like wheat or other grains. This equipment typically includes multiple components that work together to extract and refine the flour into its usable form.

1. Sifters - These machines use mechanical means to separate fine particles from coarse ones in a mixture.
2. Debarkers - These remove the husks (scutellaria) from the kernels of grains, often used with sifters.
3. Grinders - Used to break down the grain into smaller pieces suitable for further processing.
4. Screening Machines - Particles are screened out based on their size through sieves.
5. Threshers - Remove chaff, which is the outer layer of the grain, using mechanical force.
6. Powerscreeners - A combination of threshers and de-barkers where both processes occur simultaneously.
7. Combination Machines - Often include elements from several categories above.

Principle:

The basic principles behind these machines involve physics and engineering:

1. Mechanical Separation: By utilizing different physical properties such as density, shape, or moisture content, particles can be separated more effectively.

   • Density Separation: Larger particles sink while lighter ones float due to differences in weight.
   • Shape-Based Separation: Different shapes have different masses, allowing for separation based on mass distribution.
   • Moisture Content: High-moisture grains settle faster than low-moisture grains, aiding in removal.

2. Pressure Applications: Pressure can be applied mechanically or via pneumatic systems to push particles towards specific areas within the machine.

   

   • Manual Pressure: Using levers, screws, or hand-operated mechanisms to exert pressure.
   • Automated Pressurization: Using hydraulic or electrical systems controlled by motors.

3. Rotational Motion: Rotating blades or screens can cause movement and separation of material. For example, grinding mills rotate metal discs against the kernel to crush them.

   • Belt Driven Machines: Belt drives transfer rotational energy to the feed, enabling efficient continuous operation.

4. Electromagnetic Fields: In some advanced models, electromagnetic fields can be utilized to separate different types of particles without direct contact.

   

   • Non-Contact Sorting: Using magnetic or electrostatic forces to sort particles.

5. Inertial Forces: The principle of inertia can be exploited by designing machines to move heavier objects at a higher speed relative to lighter objects, thus causing them to separate.

   • Speed Differential Sorting: Faster-moving parts create centrifugal effects that can displace lighter objects.

Each component works together to achieve uniformity in the processed product, ensuring high-quality flour that meets specific standards set by manufacturers and consumers alike.