The Impurity Removal Function of Grain Cleaning Screen

The impurity removal function of the grain cleaning screen is the first line of defense in ensuring the quality of grain processing. It directly determines the market grade and food safety of the finished grain. This article will systematically analyze its core technical principles and innovation upgrade paths.

Technical Innovation of the Vibrating Sieving System

High - Frequency Vibration and Material Stratification Mechanism

The core of the impurity removal function of the grain cleaning screen lies in the vibrating sieving system. The equipment completes impurity separation through a three - stage vibration process:

Primary vibration frequency (800 times per minute): Initially stratifies grain and impurities, with large - particle straw floating to the surface layer.

Secondary acceleration (1200 times per minute): By increasing the amplitude to 5mm, it pushes heavy impurities like gravel down to the bottom of the screen.

Directional throwing motion: The screen surface is designed with a 15° inclination, concentrating light impurities towards the tail - end air - separation system.

Precision Matching Strategy for the Screen System

Dynamic Aperture Adjustment Technology

Traditional fixed screens can no longer meet the needs of multi - variety processing. The new - generation grain cleaning screen's impurity removal function breaks through limitations through innovative design:

Intelligent aperture switching: Automatically adjusts screen hole size based on grain size (e.g., corn 8mm, millet 2mm), with an error controlled within ±0.2mm.

Elastic screen wire structure: Using manganese steel screens that produce micro - deformation during vibration, preventing material jams and increasing impurity throughput.

Collaborative Upgrade of the Air - Separation System

Multi - stage Wind Control Model

In the optimization of the grain cleaning screen's impurity removal function, the air - separation system plays the ultimate purification role:

Cyclone separation device: Forms an 8 - 10m/s negative - pressure airflow at the end of the screen body, adsorbing light impurities with a density of <800kg/m³.

Humidity compensation module: When grain moisture content >16%, it automatically increases wind speed to 12m/s to prevent screen blockage.

Pulse dust - removal technology: Releases 0.6MPa high - pressure airflow every 30 seconds to remove filter - screen dust and keep the air - channel clear.