Double Body Paddy Separator Factory

Precision Separation: The Function of the Double Body Paddy Separator

Introduction
Following the husking process, the resulting product is not pure brown rice. It is a mixture of brown rice, unhusked paddy, partially husked kernels, and broken grains. Sending this mixture directly to a whitener would be highly inefficient and damaging: the hard, inedible paddy would absorb the abrasive action meant for the bran, reduce capacity, damage the whitener's screen, and still end up unhusked in the final product. The Double Body Paddy Separator is the precision machine designed to solve this problem, efficiently segregating unhushed paddy from brown rice based on their fundamental physical differences. This article from Shijiazhuang Xinlu Technology Co., Ltd. examines the ingenious principle and critical operation of this separator.

The Basis for Separation: Differences Between Paddy and Brown Rice
While similar in size, paddy and brown rice have distinct properties that a separator can exploit:

• Bulk Density: Brown rice is denser and heavier than paddy.

• Surface Texture: The surface of paddy is rough and hairy (due to the husk), while brown rice is smoother.

• Size and Shape: Paddy is typically longer and, due to the husk, slightly wider than brown rice. It also has a more pronounced longitudinal groove.

Working Principle: The Indented Tray
The core component of a paddy separator is a reciprocating indented tray. These trays are made of metal or composite material and are covered with thousands of precisely formed pockets or indentations.

The separation process is continuous and mechanical:

1. Feed and Stratification: The mixture of brown rice and paddy is fed evenly onto the oscillating trays. The reciprocating motion (a combination of horizontal and vertical movement) causes the material bed to fluidize and stratify. The denser, smoother brown rice kernels settle to the bottom of the moving layer, while the lighter, rougher paddy grains tend to float towards the top.

2. The Role of the Pockets: The indentations on the tray are specifically sized and shaped to be just large enough to capture a single grain of paddy, but too shallow to hold a denser grain of brown rice effectively.

3. Differential Movement (The Key Action): As the tray oscillates, the grains in the top layer (predominantly paddy) are caught by these pockets. The specific motion of the tray causes these captured paddy grains to be carried upwards along the inclined tray surface. Meanwhile, the brown rice kernels, which are not held securely in the pockets, slide and tumble downwards across the tray due to gravity.

4. Discharge: This differential movement results in a continuous and highly efficient separation:

• Brown Rice Outlet: Located at the lower end of the tray incline, where the brown rice naturally collects and discharges.

• Paddy Outlet: Located at the upper end of the tray incline, where the pockets carry and release the unhusked paddy.

• Mixture Outlet: A third outlet is often present in the middle to collect any unseparated mixture, which is typically recycled back to the feed of the separator or to the husker for reprocessing.

The "Double Body" Advantage
A Double Body Paddy Separator essentially consists of two independent separating units (each with multiple trays) housed within a single machine frame and often driven by a single motor. This design offers significant benefits:

• Space Efficiency: It doubles the processing capacity without doubling the floor space requirement.

• Cost-Effectiveness: Reduces manufacturing and installation costs per unit of capacity compared to two single machines.

• Operational Flexibility: The two bodies can be fed from a common source, simplifying the plant layout. They can also be tuned slightly differently to handle variations in the feed material.

Performance Metrics and Adjustment
The efficiency of a paddy separator is measured by the purity of its output streams. A high-quality machine should achieve:

• Brown Rice Output: Containing less than 2-3% paddy.

• Paddy Output: Containing less than 5-8% brown rice.
  Performance is tuned by adjusting:

• Oscillation Speed and Stroke: Affects the fluidization and movement of the grain bed.

• Tray Incline Angle: Influences the speed at which grains travel across the tray.

• Feed Rate: An even, consistent feed is absolutely critical for optimal separation.

Conclusion
The Double Body Paddy Separator is a masterpiece of mechanical precision and ingenuity. It performs a vital, non-negotiable function in the rice milling process, ensuring that downstream equipment receives only the appropriate material for processing. By maximizing whole grain yield and protecting expensive machinery, it is a fundamental contributor to the profitability and efficiency of any mill. Shijiazhuang Xinlu Technology Co., Ltd. produces robust and highly efficient separators that ensure this critical separation is performed with the utmost reliability and precision.