Principle of Airflow Crusher:
The compressed air is accelerated into subsonic or supersonic airflow through a Laval nozzle, and the ejected jet carries the animal material in high-speed motion, causing the material to collide, friction, and shear, resulting in crushing. The crushed materials are classified in the grading zone along with the airflow. Materials that meet the particle size requirements are collected by the collector, while materials that do not meet the particle size requirements are returned to the crushing chamber for further crushing until they reach the required particle size and are captured.
The crushing process of the airflow crusher:
After compressed air or superheated steam passes through the nozzle, high-speed airflow is generated and a high velocity gradient is formed near the nozzle. The supersonic and turbulent flow generated by the nozzle serves as a particle carrier. The material enters the nozzle through negative pressure injection, and the high-pressure airflow carries the particles to rotate in the crushing chamber, forming a strong rotating airflow. The material particles not only collide with each other, but also have an impact shear effect on the material particles. At the same time, the material also has an impact, friction, and shear effect with the powder crushing chamber. If the energy of the collision exceeds the energy required inside the particle, the particle will be crushed. The fine particles that pass the crushing are pushed into the cyclone separation chamber by the airflow, while the coarser particles continue to be crushed in the crushing chamber, thus achieving the purpose of crushing.
Characteristics of Airflow Crusher:
1. More than 80% of particles are crushed by mutual impact and collision between particles, while less than 20% of particles are crushed by collision and friction between particles and the inner wall of the crushing chamber. It can crush materials with a Mohs hardness of 1-10, and the average particle size of the material after air flow crushing is fine, with the finest reaching 0.2m, generally ranging from 0.5um to 20um; The particle size distribution is narrow, which can meet the requirements of particle size distribution product powder.
2. Due to the adiabatic expansion of compressed air at the nozzle, the system temperature decreases, and particle crushing is completed in a low-temperature instant, thus avoiding the phenomenon of certain substances generating heat and damaging their chemical composition during the crushing process, especially suitable for the crushing of thermosensitive materials. The processing temperature is low (less than the airflow temperature), and the strain rate during material crushing is high. It can crush materials with low melting points, thermal sensitivity, and biological properties. Can crush low melting point and thermosensitive materials as well as biologically active products.
3. Airflow crushing is purely a physical behavior, without the addition of other substances or chemical reactions at high temperatures, thus maintaining the original natural properties of the material. The particle surface is smooth, the particle shape is regular, the purity is high, the activity is high, and the dispersibility is good.
4. Because the airflow crushing technology is based on the self grinding principle of materials to achieve material crushing, and the power for crushing is air. The crushing chamber causes minimal contamination to the product, and the crushing is carried out under negative pressure without any leakage of particles during the crushing process. As long as the air is purified, it will not create new sources of pollution.