In recent years, with the rapid development of China's traditional Chinese medicine industry, the mechanical equipment industry related to the deep processing of traditional Chinese medicine industry has also ushered in more development opportunities. In the process of drug production, particle size is very important for drug bioavailability, so crushing is a very key link. Due to the low crushing temperature, short production cycle, high powder collection rate, uniform and fine particle size distribution, the traditional Chinese medicine air mill has become a powerful assistant in the process of pharmaceutical crushing. Let's follow the small series of airflow crusher manufacturers to see what factors affect airflow crusher.
It is understood that the airflow mill, also known as airflow mill, jet mill or energy flow mill, is a mechanical equipment that uses the energy of high-speed airflow (300-500m / s) or superheated steam (300-400 ℃) to superfine crush solid materials. As one of the commonly used ultra-fine grinding equipment, air mill is widely used in ultra-fine grinding and dispersion molding of superhard materials such as chemical materials, medicine and food, metal powder and so on.
Some customers said that the pneumatic crusher has a wide range of crushing particle size and simple and convenient operation. However, in the crushing process, the crushing effect is usually different. What's going on? The technicians of the air mill manufacturer said that the crushing effect of the air mill is mainly affected by the following factors: gas-solid ratio, working medium temperature and pressure.
Gas solid ratio
It can be understood that the gas-solid ratio of traditional Chinese medicine air mill is not only an important technical parameter, but also an important index. If the gas-solid ratio is too small, the kinetic energy of the gas flow will be insufficient, which will affect the fineness of the product. However, if the gas-solid ratio is too high, not only energy will be wasted, but also the dispersion performance of some pigments will become worse.
Therefore, technicians suggest that when the user uses superheated steam as the working fluid, when the user uses superheated steam as the working fluid, the gas-solid ratio is usually controlled at 2:4:1. The gas-solid ratio is usually controlled, and the surface treated material is usually controlled at 1:1 in the ratio of 2:4:1
Temperature of working medium
Technicians say that when the temperature of the working medium is too high, the gas flow will increase. Taking air as an example, the critical velocity at room temperature is 320m / s. When the temperature rises to 480 ℃, the critical velocity can be increased to 500m / s, that is, the kinetic energy increases by 150%. Therefore, increasing the temperature of working medium is conducive to improve the performance of traditional Chinese medicine air mill.
In addition, when titanium powder is crushed, the temperature of superheated steam is usually about 300 to 400 ℃. Technicians say that the temperature is usually high during crushing and calcination, while the temperature is low when crushing surface treated materials. Some surface treatment agents, especially organic surface treatment agents, are not resistant to high temperature, so they only need to be superheated at 100 ° C based on the original steam temperature.
Pressure of working medium
The pressure of working medium is not only the main parameter of jet velocity, but also the main parameter affecting crushing fineness.
Generally speaking, the higher the pressure of the working medium, the faster the velocity, and the greater the kinetic energy. So, what pressure should be selected for crushing? Technicians say that this mainly depends on the requirements for the fragility and fineness of the material. For example, when superheated steam is used to crush titanium powder, the vapor pressure is usually 0.8-1.7mpa, while the crushed and calcined materials are usually higher, and the surface treated materials after crushing can be lower.