How to choose crushing machinery and equipment

How to choose crushing machinery and equipment
In addition to the nature of the drug itself, the method of crushing, etc., the quality of the crushed medicine is also related to the selection of the equipment*. Therefore, the choice of crushing machinery is very important. According to the size of the pulverized raw materials and the final product, the size of the pulverization ratio determines the type of pulverizer, grinding or micro-pulverization machine, or the one-stage or multi-stage pulverizer. The number of stages in the crushing process is the main indicator for optimizing the fineness of the powder. The cost of equipment required for the first-stage crushing is less, but an excessively large crushing ratio will greatly increase energy consumption. Generally, general medicinal materials, excipients, and extracts are first considered. Grade crushing, hard or fibrous tough medicinal materials or large-size raw materials can be crushed one by one, and multi-stage crushing may be considered when fine powder is required.
1. The nature of the raw material
The properties of raw materials include crushability, hardness, density, colloid, surface friction coefficient, etc. The crushing properties of raw materials are closely related to the processing capacity of the machine and the required power. For example, the grinder is suitable for medium-hardness and corrosive materials; the jet mill is suitable for medium-strength brittle materials; hammer mills and mills are suitable for almost all drugs except for viscous, fibrous, heat-sensitive materials and corrosive materials; For medicines with viscous, fibrous, oily and heat-sensitive properties, cooling equipment can be used. According to the nature of the material to be crushed, combined with the actual effect and experience of processing similar materials, the crusher can be selected. The crushing equipment can also be determined through experiments, scaled up calculations or various indicators of the materials.
2. The state of the raw material The state of the raw material refers to its humidity and temperature. The crushing efficiency of the same raw material with different degrees of drying varies greatly. For example, in dry pulverization, if the humidity exceeds 3%, the processing capacity will drop sharply, especially the grinder.
3. Processing capacity refers to how much material is processed by the crushing machine, which is an important parameter for selecting a crusher. However, the processing capacity is related to the size of the product, so the processing capacity refers to how much raw material is crushed * what size, crushed per unit time Tonnes. It is roughly the data when a certain representative raw material is continuously fed under good conditions. Although it can be used as a basis, when selecting equipment, it is still necessary to evaluate the actual nature and feeding conditions of the material. We must leave the necessary room.