Small jet mill: working principle and experience.
1. Introduction. Jet mill is a kind of equipment that uses high-speed air flow to achieve material crushing. It is widely used in various industries, such as pharmaceutical, food, chemical, etc., and can be used to crush various hard, brittle and non-brittle substances. Among the many grinding equipment, the small jet mill is particularly suitable for laboratory and small-scale production environments due to its compact structure, simple operation and convenient maintenance.
Second, the working principle.
The working principle of the small jet mill is mainly to impact the material through the high-speed air flow, so that the material is crushed under the strong shear force of the air flow. Specifically, when a high-velocity air stream passes through the nozzle of the grinding chamber, a high-velocity jet is formed, which creates an impact on the material. At the same time, while the material is impacted, it will also be subjected to the strong shear action of the surrounding air flow, which makes the stress concentration between the material particles, so that the material particles are broken.
In addition, according to the principle of aerodynamics, when two air currents in opposite directions meet, a vortex is formed, which produces a strong centrifugal effect on the material particles. This centrifugal action is also an important reason for the crushing of material particles in small jet mills.
3. Experience in use.
When using a small jet mill, you need to pay attention to the following:
Material selection: For non-brittle and high-hardness materials, pretreatment is required first, such as crushing, coarse grinding, etc., to improve the crushing efficiency. At the same time, it is necessary to pay attention to the humidity of the material, and the overly wet material is easy to block the crushing chamber.
Adjustment of operating parameters: It is necessary to reasonably adjust the air flow speed, nozzle diameter and other parameters according to the characteristics of the material and the crushing requirements to achieve the best crushing effect.
Regular maintenance: In order to maintain the performance and life of the crusher, it is necessary to regularly check whether the fasteners and seals of the equipment are in good condition, and clean the crushing chamber and nozzles regularly to ensure the normal operation of the equipment.
Safe operation: When using a small jet mill, it is necessary to pay attention to the safety operation procedures, such as not opening the door of the grinding chamber when the equipment is running. At the same time, it is necessary to ensure that the equipment is well grounded to prevent accidents.