Planetary mills and rotary mills and planetary vibrating mills

1. Planetary mills and rotary mills
Conventional barrel mills ( ball mills , rod mills, self-grinding mills, etc.) mainly perform grinding work under the constraints of the Earth's gravitational field. The working force field of the vibrating mill can be increased to (3~10)g, (g is the gravity of the gravitational force); its basic feature is to grind the material by the high frequency vibration of the grinding medium. The agitating mill has a partial centrifugal force, but this type of Grinding Machine mainly relies on the rotation of the agitator to drive the grinding medium to produce a grinding effect. Planetary mills and rotary mills are completely different from the movements of the above-mentioned types of mills; such mills rely on the grinding cylinder itself to have a strong rotation and revolution, which causes the grinding medium to produce a huge impact and grinding action to grind the material. .
Figure 1 shows the structure and working principle of a planetary mill. When the drive shaft 6 is rotated by the motor, the connecting rod 2 and the barrel 3 will rotate around the common shaft 6; at the same time, the gear 4 drives the gear 5 to rotate, thereby causing the barrel 3 containing the grinding medium to wrap around itself. The axis rotates. Planetary grinding mainly pulverizes materials by the friction between the materials in the mill and between the materials and the grinding media.
Figure 2 shows the structure and working principle of a rotary mill. When the rotating shaft 6 rotates, the cylinder 1 rotates in the vertical direction around 2 in addition to the horizontal rotation, which causes the grinding medium to perform a very complicated movement. The appropriate ratio of the cylinder in the vertical direction and the horizontal direction is 1:1~1:1.5.


Figure 1 Schematic diagram of the planetary mill
1. Rack; 2. Connecting rod; 3. Cylinder; 4. Fixed gear; 5. Cylinder transmission gear; 6. Transmission shaft; 7. Hole [next]


Figure 2 Schematic diagram of the rotary mill
1. cylinder; 2. transmission shaft; 3. bearing; 4. slide; 5. support ring; 6. rotating shaft;

Second, the planetary vibration mill
The planetary vibrating mill is a new type of high-efficiency ultra-fine grinding equipment that combines the principles of planetary grinding and vibration grinding (Fig. 3): it was developed by South China University of Technology. The structure of this new type of mill is shown in Figure 4. It consists of four parts: the power system, the transmission system, the vibration system and the planetary system. The motor of the powertrain is connected to the No. 1 shaft via a flexible coupling. The transmission system includes the I-IV tape wheel and the II shaft. The I and II tape wheels constitute a first-stage deceleration system, and the III and IV tape wheels constitute a two-stage deceleration system. The vibration system consists of the No. I shaft, the eccentric weight, the I and II brackets, the vibrating frame and the spring. The vibrating frame fixes the brackets I and II on the spring to form a vibrating frame. The frame vibrates by the inertial centrifugal force generated when the eccentric weight is rotated. The planetary system consists of V, VI tape wheel, main shaft, connecting pipe, grinding cylinder shaft, grinding cylinder and so on. The No. III tape wheel and the main wheel rotate synchronously; the rotation of the No. III wheel forms a revolution of the tube around the No. I axis; the No. II wheel drives the VI No. wheel to form a self-propagation of the grinding wheel around its own axis.
This kind of mill has the characteristics of both planetary grinding and vibration grinding. It has the dual functions of high frequency impact and grinding and stripping, so it has strong grinding action and is an effective superfine grinding equipment. Table 2 shows the grinding industrial alumina and zircon with the particle size distribution of the mill product.

Table 2   Planetary vibration mill product particle size distribution

raw material
Particle size, μm
Arithmetic average
+10
-10+8
-8+5
-5+3
-3+1
-1+0.5
-0.5
Zircon
Industrial alumina
0
0
1.0
1.3
5.8
4.0
6.9
4.2
22.2
19.3
24.0
47.7
43.1
47.7
1.45
1.23


Figure 3   The difference between planetary grinding, vibration grinding and planetary vibration grinding
a. planetary grinding; b. vibration grinding; c. planetary vibration grinding


Figure 4   Schematic diagram of planetary vibration grinding structure
1. motor; 2. flexible coupling; 3.I tape wheel; 4.I bracket; 5. IV tape wheel;
6.V tape wheel; 7.VI tape wheel; 8. main shaft; 9. grinding cylinder; 10. grinding cylinder shaft; 11. driven wheel;
12. Connecting pipe; 13. No. II bracket; 14. Eccentric weight; 15. Vibrating frame; 16. Spring; Tape No. 17.
18. Axis II; 19. II tape wheel; 20.I axis

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