Super-micro gas flow grinding is a more mature ultrafine pulverized device. Unlike other ultrafine pulverized devices, the principle of pulverization is to utilize high-speed airflows, and the energy generated by the nozzle mounted around the cavity, so that the material is intensely impact, collision, friction, and airflow to material. Under shear, pulverized into fine particles. Ultra-micro gas flow is widely used in ultrafine pulverization processing of powder drugs. Its production process continuous, large capacity, and high automation. Moreover, due to the small particle size of the processed product, the particle size distribution is narrow, the purity is high, the particulate activity is high, and the dispersibility is good, and is particularly suitable for the contaminated material that is not allowed to be contaminated.Large fluidized bed airflow pulverizer is composed of air compressor, air purifier system, ultrasonic airflow pulverizer, classifier, cyclone separator, dust collector, exhaust fan. In the medium, small
fluidized bed airflow pulverizer, usually combined with supersonic airflow pulverization machine, classifier, cyclone separator, dust collector, exhaust fan, etc., can greatly save area area, It is conducive to installation, transportation and use. 1, the principle of pulverization
Fluidized bed airflow pulverizer consists of a silo, a screw feeder, a feed chamber, a pulverizing chamber, a cyclone separator, a dust collector, and the like.
First, the material to be pulverized is from the screw feeder, conveyed to the feed chamber, and the material is found in the gravity of the gravity.
The crushing room is surrounded and a specially designed high-pressure intake nozzle provided in a phased arrangement. The purification and dry compressed air are ejected from the nozzle to form an ultrasonic gas stream. Materials collided at high-speed airflow intersection centers, and it was pulverized in an instant.
The pulverized particles rose to the grading chamber, and the qualified particles enter the cyclone separator with the gas, and finally obtain the desired product, the exhaust gas enters the dust collector.
The larger particles were reset to the pulverized chamber under the graded machine, and was killed again until qualified products.
2, the principle of airflow class
In the ultrafine pulverization process, it is necessary to obtain a few microns or even finer powder, and the normal screening method is not performed. Therefore, this unit is provided with a turbine grading system in the hierarchy, which is a typical structure using the centrifugal power field.
The pulverized material is pulverized in the chamber, which is driven by the rising airflow, and under the action of the hierarchical turbine classifier, if there is the same particles at the edge of the turbine, this particle will be subject toThe role of two different power of the centrifugal power field. That is, the centrifugal force F and the airflow resistance R generated by the turbine rotate.
Assuming that the particle size is D, the density is δ, the medium is, the tangential speed of the particles is UT, the turbine has an average radius of R, the dielectric viscosity is η, the radial speed of the particles is UR. These two force can be represented by the following equations:
R = 3πηdur
When the particles are large, the centrifugal force is greater than the resistance, that is, f> r, the large particles fly along the turbine tangential direction Then return to the pulverized chamber to be re-pulverized.
Excellent refinement, win! In order to ensure the "zero-defect, continuous improvement" quality improvement and effective development, Shandong ALPA Powder Technology Co., Ltd. Quality Management Committee actively explores the management of new models, receiving the study of 8D working methods in recent hours, and combines enterprises Operation status, initially formed organic combination, comprehensive quality control system and successful practice, effectively improved the company's quality risk prevention and control ability, in order to promote the high-quality development of enterprises to build a solid foundation.
