Principle of Screening Equipment for Grain Silo

In the storage and processing of grain, the screening equipment for grain silos plays a crucial role. It not only effectively removes impurities but also achieves grain size grading, enhancing grain quality and processing efficiency. This article will delve into the principle of screening equipment for grain silo and explore its important applications in grain handling.

Operation of Vibrating Screening Technology

Basic Principle of Vibrating Screening

The principle of screening equipment for grain silo includes using vibrating screening technology. The periodic vibration of the screen box causes grain particles to jump, roll, and stratify on the screen surface according to their sizes. The core lies in the unbalanced centrifugal force generated by the vibration source (motor or vibrator), which induces high-frequency, low-amplitude vibrations of the screen box.

Key Elements of Screen Surface Design

The design of the screen surface inclination angle is one of the important parameters of vibrating screening equipment. It is determined based on the characteristics of grain materials and usually ranges from 20° to 60°, balancing screening efficiency and equipment capacity. For example, when processing wheat, setting the inclination angle to 30° allows wheat to form a uniform flow layer on the screen surface. Fine particles quickly pass through the screen holes, while larger particles move along the screen surface towards the outlet, achieving size grading.

Aerodynamically assisted screening principle

Operation Mechanism of Aerodynamic-Assisted Screening

The principle of screening equipment for grain silo also includes aerodynamics. It creates a negative pressure environment using airflow. When grain enters the screening chamber, the airflow lifts and suspends lightweight impurities (such as chaff and rice husk fragments), which are then collected by the suction system. Meanwhile, denser grain particles continue to move along the screen surface.

Advantages of Improved Screening Precision

With aerodynamic assistance, the screening precision of the equipment is 15% - 20% higher than traditional vibrating screens. This is especially suitable for the initial cleaning and fine selection of cereal grains. In grain processing, this high-precision screening helps improve the quality of the final product, reduce impurity content, and enhance market competitiveness.