Device for screening powder by convoluted air flow

Abstract

The invention discloses a device for screening powder by convoluted air flow, comprising a base and a powder screening room which is arranged on the base and is provided with an upper sealing cover, wherein a power inlet arranged on the upper sealing cover is communicated with an external powder inlet channel through a control valve; a double-circular-arc separation plate is concentrically arranged at the inner side of the upper sealing cover; the powder screening room is internally and horizontally provided with a sample separation sieve; an air outlet pipeline connected with an air outlet of an air filter extends from the bottom of the powder screening room to be communicated with an air nozzle which is arranged below the sample separation sieve; and a powder outlet pipeline which is arranged below the powder screening room is communicated with a negative-pressure collecting device. The device provided by the invention has the advantages that the sample separation sieve can be conveniently exchanged and can be used for accurately screening superfine powder with different grain diameters and precisely controlling the largest grain diameter of finished-product micro-powder; the whole screening device is a closed negative-pressure atmosphere, so that dust pollution caused by screening the powder is effectively prevented; and meanwhile, the pollution to traditional Chinese medicine micro-powder, which is caused by dirt in the air, can be prevented, and a screen can be washed by upwards rushing the air flow in a powder screening process and the problem that the sample separation sieve is blocked is solved.

Description

Technical field [0001] The invention relates to a powder screening device, in particular to a whirling airflow screening device commonly used in laboratories. Background technique [0002] Ultrafine pulverization technology is a new technology developed on the basis of powder science, along with continuous improvement of pulverization technology, breakthrough progress in pulverization theory and related disciplines, and the emergence of pulverizing equipment. In the pharmaceutical field of traditional Chinese medicine, compared with the processing methods of traditional Chinese medicine, ultra-fine pulverization technology has the advantages of cost saving, easy application, increased drug absorption rate, and improved bioavailability. However, in the pulverization process, due to the surface activity and The extremely high interface characteristics make the powder exhibit strong adhesion, and the mixed powder is prone to block the screen when sieving, which affects the sieving r...

AI Technical Summary

Problems solved by technology

In the field of traditional Chinese medicine, compared with the processing methods of traditional Chinese medicine, ultrafine pulverization technology has the advantages of cost saving, easy application, increased drug absorption rate, and improved bioavailability. However, in the pulverization process, due to the surface activity and The extremely high interface properties make the powder show strong adhesion, and the mixed powder is prone to clogging the screen when sieving, which affects the sieving rate of the drug

At present, the commonly used ultrafine pulverizers in the traditional Chinese medicine pharmaceutical industry are mechanical or airflow ultrafine pulverizers. Although equipped with an impeller classifier, the average particle size of the micropowder can reach below 25 μm, but there is a problem of uneven particle size of the finished product. Need Only through sieving can the maximum particle size be precisely controlled

At present, the mixed powder sieving method used in the laboratory still adopts the method of manual sieving by dividing samples. In the powder sieving process, not only the dust is large and the efficiency is low, but also the sieving of fine powder above 200 mesh is often difficult due to the problem of network blockage; The ultrasonic vibrating sieve combined with the sieve and ultrasonic vibration principle has a certain improvement in efficiency compared with the manual sieve, but the problems of dust pollution and network blocking have not been fundamentally solved

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