Since the mid-1940s, pneumatic conveying technology was introduced and became an indispensable processing tool for grain processing enterprises. Nowadays, the application of air flow in grain processing plants has passed over half a century. Although winnowing was used for grain cleaning and purification thousands of years ago, the extensive application of various processes in the processing of air, such as air separation, suction and dust removal, purification of abrasive products, and control of dust, was almost 100 years old. Things.
The task of the cleaning process is to remove all kinds of impurities in the net grain. Among them, dust and other impurities are most likely to be lifted during cleaning, and the separation and control of light impurities cannot be separated from the use of air. Therefore, in the face of the increasing use of air volume in grain processing and the trend of increasingly large wind screen systems, it is imperative to study the application technology of air in grain processing plants to achieve “one wind and multiple uses†and improve their process efficiency. Has a positive and practical significance.
The grain must be cleaned before it is processed. This is an essential part. Current methods for grain cleaning include: wind selection, screening, specific gravity separation, magnetic separation, surface treatment, etc., but the most useful and most widely used method for separating light impurities such as dust from cereals is airflow separation technology. selected. At present, in the grain plant, airflow separation is one of the main methods for grain cleaning and grading. Removing light impurities from grain, separating rice hulls from brown rice, and separating air flow are the only methods.
The early wind-selection equipment in domestic grain processing plants has cylindrical and square shapes, all of which have been eliminated due to their large size and poor separation. In order to improve the efficiency of wind separation, the square suction separator has been developed as a double-wind suction separator, and a suction duct has been added on the original basis so that the grain is separated in the separator by secondary air flow.
The commonly used wind separation equipment for grain cleaning abroad includes two types of air separators produced by the French company Daquet and a flow separator manufactured by Carter-Day, Canada. The aerodynamic system produced by France exhibits axial suction and uniform airflow. The closed loop fluid separator produced by Canada is not exhausted indoors and comes with a fan.
The current seed blower is a more advanced wind-selecting equipment for food processing plants at home and abroad. It is an air suction and impurity removal mechanism for shakers in food processing plants. Two suction channels are arranged at the inlet and outlet of the material to make the materials selected before and after the screening. The dust-laden airflow after the air separation is preliminarily purified by the gravity sedimentation chamber in the impurity removal mechanism. Wind network. Seed blower introduced and referenced to the technology of similar products in the United States and other countries on the basis of the use of electronic control technology developed specifically for the use of a seed cleanness test instrument. The use of seed hair dryers has broadened and the test precision has been improved to meet the needs of various seed and grain clarity tests. Compared with early wind-selection equipment, the advantages are even more obvious.
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