Divided winnowing method and system for tobacco leaf threshing

Abstract

The invention relates to a divided winnowing method and system for tobacco leaf threshing. The winnowing system consists of a leaf threshing machine (1), a primary-selection winnowing unit (3), a multi-stage fine-selection air distributing unit (4) and a secondary leaf threshing machine (6) that are sequentially arranged, wherein the leaf threshing machine and the primary-selection winnowing unitare connected via auxiliary communicated conveying equipment (2), a blanking hole (3a) of a blanking device of the primary-selection winnowing unit is arranged above a feeding device of the multi-stage fine-selection air distributing unit, and the part between the discharge hole (3b) of the primary-selection winnowing unit and the secondary leaf threshing machine is connected with a collecting air blowing pipeline (5) or a conveyor. By virtue of the winnowing system, materials obtained after leaves are threshed can be reasonably divided and winnowed, lighter materials and heavier materials are effectively separated so as to avoid the mutual influence caused by mixing different materials during winnowing, the load entering a winnowing classifier is reduced, the winnowing precision of the fine-selection air distributing unit is improved, the stalk-content index in leaves is reduced, the leaf threshing effect is enhanced, the breakage of tobacco leaves is lowered, and the resource waste is reduced.

Description

technical field [0001] The invention mainly relates to the technical field of threshing and redrying technology and equipment in the tobacco industry, in particular to a method and system for air-selecting materials after threshing by a threshing unit. Background technique [0002] At present, in the threshing and redrying process and equipment systems at home and abroad, the air separation mode of the threshing unit is basically to use multi-stage air separators in series to air divide all the materials after threshing, that is, the materials after threshing (including Heavier tobacco stems and leaves with more stems and lighter pure leaf tobacco sheets and leaves with less stems) are sent to subsequent air separators in series through air delivery pipelines or belt conveyors for one by one Stage air separation, to separate the qualified free pure leaf tobacco sheets from the main line as much as possible, and the heavier material enters the lower-level leaf-threshing equip...

AI Technical Summary

Problems solved by technology

In the 12000kg / h leaf thresher unit, in order to obtain sufficient air distribution area of ​​the first-stage air separator, the specification of the air separator is generally 3050mm or 3660mm, and the production capacity of 18000kg / h-24000kg / h must be met, in order to ensure Sufficient air distribution area will inevitably increase the width of the air separator, and the widening of the air separator will bring many unfavorable factors, which not only increases the difficulty of processing and manufacturing parts, but also reduces the reliability and stability of the equipment. It is also difficult to control the wind speed and wind field uniformity of the air separator, which seriously affects the winnowing effect

In addition, after increasing the width of the air separator, the air volume of the fan must be increased, and a fan with a higher power must be selected, which increases energy consumption and increases the noise of the equipment.

[0004] In addition, the current method of threshing and winnowing has a relatively big disadvantage, that is, in addition to free qualified pure leaf tobacco sheets, there are also a certain proportion of unthreshed tobacco leaves and partly threshed pure tobacco in the raw material after threshing If these kinds of materials enter the air separator together for air separation, it will inevitably increase the wind load and affect the accuracy of air selection. However, even if these unthreshed tobacco leaves and pure tobacco stems are in series multi-stage air separation It cannot be separated by air in the air separator, and its state has not changed before and after entering the air separator, and it needs to be processed through the next stage of leaf beating. Therefore, if this part of material enters the air separator, it will not only waste resources, but also prolong the process The residence time of some tobacco leaves in the equipment will also cause the temperature and water loss of this part of the material, which is not conducive to the subsequent separation of leaf stems

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