There are many problems with laboratory grinding and dispersing machines for room temperature crushing of traditional Chinese medicine, such as the destruction and decomposition of heat-resistant components. In recent years, the application of low-temperature crushing technology has ensured the intrinsic quality of the crushed products of traditional Chinese medicine. For example, some large industrial companies, such as West Germany's Cryo Palla and Japan's LNrex series, have particle sizes of 100-200 mesh, and with coarse powder crushers, their fine powder content is very small. The grinding and dispersing machine of Taicang Xide Mechanical Technology Co., Ltd. can crush to 5-10 μ m, has an auxiliary cooling system, and the temperature will not be too high, which makes Zhongcheng medicine be selected according to the requirements of property and particle size.
The process of laboratory grinding and dispersing machine after grinding is the extraction device: tank type intermittent extraction is the main form, with equipment capacity of 2-6m3 and various specifications. There are static methods for Soxhlet extraction, as well as dynamic extraction with agitators and guide tubes inside the tank. Continuous extraction is mainly used for extraction with large processing capacity and low solid-liquid ratio requirements. The equipment includes tank group (4-6 tanks) and rotary extractor. After that, spray drying is carried out, and the drying time is only a few seconds or ten seconds, which can maintain the original color, flavor, and solubility. It also replaces multiple processes such as crystallization, drying, crushing, and sieving. Simplified the production process and is now widely used.
What is the principle and structure of a laboratory grinding and dispersing machine?
The grinding and dispersing machine is driven by an electric motor through a belt drive to rotate the rotating teeth (or rotor) and the matching fixed teeth (or stator) at high speed. The processed material is pressurized by its own weight or external pressure (which can be generated by a pump) to generate a downward spiral impact force. Through the gap between the fixed and rotating teeth of the colloid mill (adjustable gap), it is subjected to strong physical effects such as shear force, friction force, and high-frequency vibration, effectively emulsifying, dispersing, and crushing the material, achieving the effect of ultrafine crushing and emulsification of the material.
The refining effect of a grinding and dispersing machine is generally stronger than that of a homogenizer, but it has a stronger adaptability to materials such as high viscosity and large particles. Therefore, in many cases, it is used in the front of a homogenizer or in high viscosity situations.
Grinding disperser is a high-tech product composed of colloid mill and disperser.
The first level consists of three-level sawtooth protrusions and grooves with increasing precision. The stator can be infinitely adjusted to the desired distance between it and the rotor. Under enhanced fluid turbulence, grooves can change direction at each stage.
The second stage is composed of a stator:
The design of the dispersing head also effectively meets the needs of substances with different viscosities and particle sizes. The difference in the design of the stator and rotor (emulsifying head) between online and batch machines is mainly due to the requirements for conveying performance. It is particularly important to note that the difference between coarse precision, medium precision, fine precision, and other types of working heads is not only in the arrangement of rotor teeth, but also in the geometric characteristics of different working heads. The number of slots, slot width, and other geometric features can change the different functions of the stator and rotor working heads.
According to past practice, work heads are defined based on past experience to meet a specific application. In most cases, the construction of a machine is tailored to its specific application, making it crucial for producing the final product. When it is uncertain whether the construction of a working head meets the expected application. The linear velocity is very high and the shear gap is very small, so when the material passes through, the frictional force formed is relatively intense, resulting in what is commonly known as wet grinding. The fixed rotor is made into a circular cone shape, with three-level sawtooth protrusions and grooves with increasing precision. The stator can be infinitely adjusted to the desired distance between it and the rotor. Under enhanced fluid turbulence, grooves can change direction at each stage. High quality surface polishing and structural materials can meet various requirements of different industries.