Vibratory Finishing Machine Manufacturer Explains How Vibrating Mills Work

Updated:01-07-2019
Summary:

Many people don't know much about the working principle […]

Many people don't know much about the working principle of vibrating mills. Today, manufacturers of  Vibratory Finishing Machine  will explain their principles in detail.

Working principle

When the power is turned on, the driving motor drives the eccentric block in the exciter to rotate through the flexible coupling, thereby generating a periodic exciting force, so that the grinding machine body generates high-frequency vibration on the supporting spring, and the body obtains an approximate Round elliptical motion 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. The mill barrel is discharged to become a ground product.

2. Grinding characteristics

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 are defects consisting of microscopic cracks, which are expressed in a colloidal structure with an average spacing of 0.01 to 0.1 μm. When the solid is deformed, the new surface is gradually developed based on these cracks. After unloading, under the action of molecular force, they are "healed" again, and when the individual weaker places are where the defects are larger, When a mutation occurs, 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 microcracks and breaking, so the vibration material is used to carry out the solid material. Fine grinding is more effective.

The grinding characteristics of the vibrating mill include factors such as grinding medium frequency ratio, impact frequency, grinding and impact grinding work. Since the impact energy reflects the pulverizing energy given to the material to be ground by the grinding, the greater the impact energy, the larger the pulverizing 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 is, the larger, but due to the increase of the frequency ratio, the number of impacts is proportionally reduced, which is disadvantageous for the vibration mill which mainly relies on high-frequency impact to achieve grinding, so The frequency ratio should not be too large, generally should be lower than 3. On the contrary, keeping the frequency ratio constant, and increasing the frequency of the exciting force, the opposite result is obtained, which is beneficial to the high-fine grinding of the material. Therefore, when the vibrating mill is used to improve the fine grinding material, the high-frequency exciting force and the low-frequency ratio can be selected, and when the coarser material is ground, the opposite is true.