Method and device for removing impurities of tobacco leaves in pre-processing stage of threshing and redrying

Abstract

The invention discloses a method and a device for removing impurities of tobacco leaves in the pre-processing stage of threshing and redrying. The method comprises the following steps: conveying the tobacco leaves for a certain distance by a horizontal top screening roller channel conveying device; turning the tobacco leaves for 180 degrees, and conveying a certain distance by a middle screening horizontal roller channel conveying device; later turning the tobacco leaves for 180 degrees, and conveying a certain distance by a bottom screening horizontal roller channel conveying device; removing the impurities adhered on the upper surfaces and the lower surfaces of the tobacco leaves from the gaps among the roller channels, and separating the impurities from the tobacco leaves; and simultaneously arranging impurity collecting devices at the lower sides of the top screening roller channel conveying device, the middle screening roller channel device, and the bottom screening roller channel device, and collecting the dropped impurities. The invention can effectively separate the impurities and fragments, such the sand, dust and hemp thread, from the tobacco leaves in the pre-processing stage of threshing and redrying, and can effectively reduce the broken tobacco. The device has a compact structure and small taken area.

Description

technical field [0001] The invention relates to the technical field of a method and equipment for screening and removing impurities from tobacco leaves in a pretreatment section of a threshing and redrying line in the tobacco industry. Background technique [0002] At present, in the threshing and redrying process and equipment at home and abroad, there are mainly two modes for the sand screening process, namely, the drum type sand screening machine and the roller vibrating screening machine. Although the drum type sand screening machine has high screening efficiency, it gradually fades out of the market due to the shortcomings of large crushing and large floor space. Although the roller vibrating sieving machine has the advantages of low crushing rate and small footprint, because the tobacco leaves cannot be completely turned 180 degrees during the blanking process, the sand and debris adhering to the other side of the tobacco leaves cannot be effectively shaken through sha...

AI Technical Summary

Problems solved by technology

Although the drum type sand screening machine has high screening efficiency, it gradually fades out of the market due to its shortcomings of large crushing and large floor space.

Although the roller vibrating sieving machine has the advantages of low crushing rate and small footprint, because the tobacco leaves cannot be completely turned 180 degrees during the blanking process, the sand and debris adhering to the other side of

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