Device and method for increasing material separation rate through negative-pressure air system

Abstract

The invention discloses a device and method for increasing the material separation rate through a negative-pressure air system. The negative-pressure air system is arranged below an oscillating screen and comprises a negative-pressure air cavity; the negative-pressure air cavity comprises a first negative-pressure area provided with first negative pressure and a second negative-pressure area provided with second negative pressure; the first negative-pressure area is connected with the oscillating screen; the second negative-pressure area is connected with the first negative-pressure area; a conveying device is positioned in the second negative-pressure area; the absolute value of the first negative pressure is smaller than that of the second negative pressure; materials pass through the oscillating screen and then penetrate screen holes to enter the first negative-pressure area, and most of the materials fall on the conveying device to be conveyed out of the device, and a small part of materials which are small in bulk specific gravity penetrates the first negative-pressure area to enter the second negative-pressure area and fall on the conveying device in the second negative-pressure area in a stalled manner.

Description

technical field [0001] The invention belongs to the field of material separation equipment, and in particular relates to a material separation equipment and method using a negative pressure air system. Background technique [0002] In the prior art, vibrating sieves are generally used to screen materials to remove unqualified materials with large differences in shape, so as to improve the quality of materials. However, for some light, brittle, and fragile materials, a large number of materials are usually stacked on the vibrating screen. After vibration, it is difficult for qualified materials to quickly pass through the screen holes by gravity and be completely screened out. Only a part is completely screened, and after multiple vibrations, the original complete materials (tobacco leaves, shredded tobacco) may be shattered, thereby reducing product quality and causing material loss. [0003] For example, in the current domestic rebaking and silk production processes, in th...

AI Technical Summary

Problems solved by technology

Since the shredded tobacco cannot be completely spread out in the vibrating sieve, the overlapping state is serious, and the one-time pass rate of the shredded tobacco through the sieve hole is too low, so it can only be separated by repeated throwing and falling processes, or by increasing the amplitude and frequency of the vibrating sieve. separate

In this way, not only the separation rate is low, but also a large amount of fragmentation is caused, and the loss is increased.

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