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When the motor drives the eccentric block in the exciter through the flexible coupling to generate a periodic exciting force, the mill cylinder generates high-frequency vibration on the supporting spring, and the body obtains an elliptical shape similar to a circle. Movement track. With the vibration of the mill barrel, the medium in the cylinder can obtain three kinds of movements: strong projection movement, which can quickly break large pieces of material; high-speed co-rotation movement, grinding the material; slow revolution movement, starting from Uniform material action. When the mill cylinder vibrates, the grinding medium strongly impacts and rotates. The material entering the cylinder is ground under the impact and grinding action of the grinding medium, and gradually moves toward the discharge port with the balance of the material surface, and finally discharges. The mill barrel becomes a grinding product.
When the vibrating mill is in operation, the high-frequency impact of the grinding media and the strong grinding action will grind the material. This process is mainly caused by the fatigue damage of the particles caused by the repeated impact of the grinding body and the material in the grinding body.
All solids (blocks, granules) are defects composed of microscopic cracks, which are expressed in a colloidal structure, and the average spacing of these microcracks is 0.01 to 0.1 μm. When the solid deforms, the new surface develops on the basis of these cracks. After unloading, under the action of molecular force, they re-heal, and when the weakest part is the most defective, the mutation occurs. At the time, the solid will cause macroscopic damage. The impact of the grinding body on the high frequency of the material to be ground in the vibrating mill makes these super micro cracks not to be "healed" and is continuously impacted, rapidly expanding the micro cracks and breaking, so the vibration material is used to carry out the solid material. Fine grinding is the most effective.
The grinding characteristics of the vibrating mill include grinding medium frequency ratio, impact frequency, grinding and impact grinding work and other factors. Since the impact energy reflects the pulverization energy given to the material to be ground by the grinding, the greater the impact energy, the larger the pulverization energy obtained by the material to be ground, and the more suitable for coarse grinding. The impact frequency reflects the number of impacts that the grinding media gives to the workpiece. Therefore, the higher the impact frequency, the more the number of impacts per unit time is, which is beneficial to the fine grinding of the material.
When the frequency of the exciting force is determined, the higher the frequency ratio (the ratio of the vibration frequency of the mill to the frequency of the grinding impact), the larger, but due to the increase of the frequency ratio, the number of impacts is proportionally reduced, which is mainly relied on High-frequency impact to the grinding vibration mill is unfavorable, so the frequency ratio should not be too large, generally should be lower than 3, on the contrary, keep the frequency ratio unchanged, increase the frequency of the exciting force to get the opposite result, which is conducive to the high material Finely ground. Therefore, when the vibrating mill is used to improve the fine grinding material, the high-frequency excitation force and the low frequency ratio can be selected, and when the coarser material is ground, the opposite is true.