[Airflow mill] How does the jet mill work?

The working principle of the jet mill utilizes the strong multi-turbulent flow field formed when the high-speed airflow is sprayed, so that the solid particles therein are deformed and broken during self-collision or collision with the impact plate and the wall.

The powder is fed into the feed nozzle by the electromagnetic vibrating feeder, and is injected into the crushing chamber by the compressed air supplied by the feed, and the supersonic flow is formed by the high-speed airflow sprayed from the crushing nozzle, causing collision, shearing and crushing of the cavity in the flow. Wall collision and friction achieve the purpose of pulverizing into fine powder. During high-speed movement and pulverization of the stream, particles of different fineness will produce different centrifugal forces in the swirling airflow. The powder particles of acceptable fineness have greater force than the centripetal airflow. The centrifugal force is brought to the discharge pipe by the exhaust gas flow, and the finished product is collected through the cloth bag, and the larger particles are thrown to the periphery due to the centrifugal force greater than the force of the centripetal air flow, and the pulverization process continues with the high-speed movement of the logistics.
Performance characteristics
1. There is a vertical grading device inside, which can adjust the product particle size, the pulverization granularity is good, the distribution is relatively narrow, the product fineness is uniform, the particle surface is smooth, the shape is regular, the purity is high, the activity is large, and the dispersion is good.

2. Suitable for pulverizing low-melting and heat-sensitive materials and biologically active products. Because the jet mill is powered by compressed air, the adiabatic expansion of the compressed gas at the nozzle will lower the temperature of the system, so no large amount of heat will be generated during the work.
3. It can be used in series with a multi-stage classifier, so that multiple particle size segments can be formed simultaneously.
4. The equipment is easy to disassemble and easy to clean. There is no dead angle on the inner wall, it can be cleaned thoroughly, and it can be operated under aseptic condition.
5. Closed operation, low running noise, can reduce the generation of dust, not only environmental protection, but also less contaminated products.
6. The production process is continuous, the production capacity is large, the degree of automation and automation is high, the control system is simple to operate, and the equipment operation is safe and reliable.

7. Can achieve joint operations. Because when pulverizing with superheated high-pressure saturated steam, the material can be pulverized and dried at the same time, and can be used as a mixer; while the material is pulverized, it can be sprayed with a solution of the desired concentration to cover the solid fine particles, The coating layer is formed and surface-modified, and therefore, jet milling can be combined with pulverized surface coating and surface modification. What are the advantages of the Chinese medicine cells crushed by the ultrafine pulverizer?