Methods of quality control of grinding in vibrating mills
Quality control of grinding is the most important stage in the production of various powdered materials. Its purpose is to ensure the required degree of grinding, standardize product quality and eliminate the appearance of defects. Optical, laser and electronic measurement methods are considered to be the most common methods of quality control of grinding. Below we will consider each of them in more detail in relation to the grinding process in vibrating mills.
Optical measurement methods
This method is based on visual inspection of particles under a microscope or special magnifying equipment. With this approach, the expert visually evaluates the size and shape of the resulting particles, recording deviations from the norm.
Optical methods are easy to use and accessible to most enterprises, but they are characterized by subjective evaluation and low productivity. They are recommended during the initial quality control, but are not suitable for mass inspection of large batches of products.
Laser measurement methods
The laser scattering method involves passing a light beam through a sample and registering the reflected light. The received signal is converted by the computer into a numerical value of the particle size. The laser analyzer is able to instantly determine the average particle diameter and plot size distribution histograms, which simplifies the evaluation of grinding quality.
The advantage of the method is the high accuracy and efficiency of the analysis. The disadvantage is the limited use for transparent and translucent materials, as well as the high cost of equipment.
Electronic measurement methods
Electronic methods are based on recording an electrical signal that occurs when particles pass through a special sensor. The method is characterized by high sensitivity and the ability to quantify the particle size distribution.
In addition to accuracy and objectivity, the electronic method has a wide range of measured values, which allows it to be used for various types of materials. The main disadvantage is the complexity of calibration and the need for regular sensor verification.
Factors affecting the grinding quality in vibrating mills
The quality of the grinding largely depends on a number of external factors:
- The quality of the raw materials.
- Modes of operation of the vibrating mill (oscillation frequency, amplitude and duration of the process).
- The degree of filling of the chamber with the crushed material.
- Ambient temperature and humidity.
Observing the correct operating modes of vibrating mills and taking into account the above factors allow you to get a stable result and