After harvesting, legumes (such as soybeans, red beans, mung beans, and kidney beans) are often mixed with impurities such as dead branches, fallen leaves, stones, lumps of dirt, broken beans, and weed seeds. As the core cleaning equipment, the air screen cleaner needs to accurately select beans based on their diverse particle shapes and complex impurity types.
When selecting, you need to focus on core dimensions such as “screen adaptability, wind controllability, structural protection, and scene matching” to ensure that the equipment can not only efficiently remove impurities but also avoid bean damage.
First, consider the “Screen Configuration”: Match the characteristics of the bean particles to ensure both impurity removal and yield maintenance.
Screen Aperture and Number of Layers: Customizable, layered impurity removal.
Aperture Adaptation: The screen aperture must precisely match the target bean particle size. The principle is to “receive acceptable beans while filtering out small impurities (such as broken beans and small mud particles).”
Number of Layers: For light impurities (less than 5% impurities), a two-layer screen is sufficient (the upper layer removes large impurities, the lower layer removes small impurities). For heavy impurities (including broken beans, weed seeds, small stones, and other impurities), a three-layer screen is recommended. Adding an intermediate grading screen allows for both impurity removal and bean grading.
Second, consider the “wind system”: controllable and adjustable to accommodate varying humidity and impurity types.
Beans have varying moisture contents (e.g., freshly harvested beans have a moisture content of approximately 15%-20%, while dried beans have a moisture content of approximately 10%-12%). Their specific gravity also varies with moisture content. Furthermore, light impurities (dead branches, fallen leaves) and heavy impurities (pebbles, lumps of dirt) require different wind speeds. The wind system must be adjustable to avoid issues like “too little wind to remove light impurities, while too much wind to blow away good beans.” When choosing a fan, consider two key points:
Fan power and speed adjustment: Multiple speed settings for precise wind control.
Power matching: Select a fan power based on daily processing volume.
Adjustable speed: 3 speeds are preferred. Equipment with adjustable wind speeds (e.g., low, medium, and high) should be used. For example, when cleaning dry beans (low moisture content and light specific gravity), use the low setting (to avoid blowing away qualified beans); when cleaning damp beans (high moisture content and light impurities that are difficult to remove), use the medium setting; and when cleaning beans with a high proportion of light impurities (e.g., beans mixed with a large amount of dead branches), use the high setting.
Airflow distribution design: uniform and vortex-free to avoid biased airflow
High-quality equipment uses a “curved air guide + multiple air outlets” design to ensure uniform airflow across the screen surface and avoid localized excessively high or low air speeds. Avoid equipment with simple air duct designs (e.g., single-outlet direct airflow), as these tend to experience strong airflow on one side of the screen and weak airflow on the other, resulting in light impurities remaining or qualified beans being blown away.
3. Must-Check “Structural Protection”: Damage-Resistant, Easy to Maintain, and Adaptable to the Characteristics of Bean Processing
Beans have a brittle skin and are easily crushed and broken, and must be cleaned hygienically to avoid contamination from residual impurities. Therefore, the equipment structure must be both protective and easy to clean. Three key areas should be inspected:
Feed and Conveyor Structure: Slow feed to minimize collisions
Impurity Collection and Discharge: Classified collection to prevent secondary contamination
Consumable Part Replacement: Easily replaceable to reduce maintenance costs
4. Optimize “Scenario Requirements”: Match production capacity and site conditions to ensure practicality and efficiency
Bean processing requirements vary significantly across different scales. Equipment selection should be tailored to your production capacity and site conditions to avoid overkill or insufficient capacity.
Trial Run Verification: Field Testing to Confirm Results
Regardless of the parameters, a small-scale trial run is ultimately required to verify the equipment’s suitability. Three key points should be observed during the trial run: Impurity removal: impurity removal rate must exceed 90%, bean breakage rate: controlled within 1%, and operational stability: no abnormal noise and no material blockage.
“Screen adaptability sets the foundation, adjustable wind speed ensures results, structural protection prevents breakage, and application-specific features improve efficiency”—selection must focus on the “particle characteristics” and “cleaning requirements” of beans, meticulously examining everything from core components to actual application scenarios. Trial runs, if necessary, are necessary to select an air sieve cleaner that delivers “highly efficient impurity removal, minimal bean damage, and easy operation and maintenance,” laying a high-quality foundation for subsequent bean processing.
Post time: Sep-17-2025
