The pumpkin seed air screening machine achieves cleaning through the synergistic effect of “air separation (separation of light and heavy impurities) + screening (separation of large and small impurities)”. Its cleaning effect is closely related to the operation standardization and equipment status.
1. Feeding: Control “Quantity” and “Stability” to Avoid Equipment Overload
Feeding is the foundation of cleaning. Uneven or excessive feeding can directly lead to congestion in the air separation and screening stages, reducing cleaning accuracy.
Stable Feed Control
Strictly feed according to the equipment’s rated capacity to avoid adding large amounts of material at once. Adjust the gate opening below the feed hopper to maintain a continuous and uniform flow of material, preventing breakage or accumulation.
If pumpkin seeds contain a high level of impurities, pre-process them through pre-treatment equipment to remove large impurities before feeding them to the air screening machine to reduce the load on subsequent equipment.
Ensure Feed Uniformity
Check the feed hopper for “bridging” (clumping of material). Install a stirring device or manually disperse the material to prevent concentrated material from falling onto the screen, which could overload or clog the screen.
2. Air Separation: Precisely Adjust “Wind Force” to Match Material Characteristics
The core of air separation is to utilize the difference in specific gravity between pumpkin seeds and impurities (such as dust, shriveled seeds, and broken leaves) to separate light impurities through airflow. Adjust the wind force based on the maturity and moisture content of the pumpkin seeds to avoid over- or under-selection.
Principles for Adjusting Wind Force
During initial commissioning, start at a low setting and gradually increase the wind force while observing the discharge outlet.
If light impurities (such as straw fragments and dust) are not removed, the wind force is insufficient and the fan damper opening or fan speed should be increased.
If normal pumpkin seeds are drawn into the impurity channel (light impurity outlet), the wind force is excessive and should be reduced to avoid loss of effective material.
Wind Speed Stability Control
Regularly check the fan impeller for dust accumulation and wear, and the air inlet for blockage to ensure stable airflow. If using a centrifugal fan, check the belt tightness to prevent speed fluctuations from affecting wind force.
3. Screening: Matching the “Screen Mesh” and “Amplitude” to Ensure Sorting Accuracy
Sieving pumpkin seeds through sieves of varying apertures separates large impurities (such as stones, intact rind, and large grains of straw) from small impurities (such as broken seeds and fine sand). Special attention must be paid to screen selection, installation, and amplitude adjustment.
4. Equipment Status: Perform thorough inspections and maintenance to avoid downtime. Stable equipment operation is essential for continuous cleaning. Inspections and maintenance must be performed throughout the entire process before, during, and after startup.
5. Safety and Quality: Balancing “Operational Specifications” and “Finished Product Control”
By controlling the above key points, the operating efficiency and cleaning quality of the pumpkin seed air screen cleaning machine can be significantly improved, laying a good foundation for subsequent processing.
Post time: Sep-10-2025
