Working principle of ball mill
The working principle of overflow ball mill is mainly supported by rolling bearings, and its cylinder is rotated by transmission machinery, and the material is fed from the ore feeding place, and the falling, impact, impact and self-grinding operations are completed together with the steel balls in the cylinder to realize the grinding of materials. Due to the continuous feeding of materials, the pressure will cause the materials in the barrel to be gradually discharged from the feeding end to the discharging end. When the pulp is higher than the lower edge of the hollow shaft at the discharge end, the material will automatically overflow, and the steel balls and coarse materials at the discharge end will be sent back to the mill by the counter-spiral blades for mechanical grinding.
2. The working principle of lattice ball mill
The working principle of lattice ball mill is similar to that of overflow type. The rotation of the cylinder drives the steel ball and the material to do parabolic motion, and in this process, the impact, grinding and crushing operations are realized. The difference is that the discharging methods of lattice ball mill and overflow ball mill are different. The discharge end cover of the lattice ball mill has a hollow journal, and a lattice plate consisting of eight radial ribs is installed in the end cover. The end cover is divided into eight fan-shaped chambers, the special-shaped bushing is fixed in the fan-shaped chambers by bolts, and then the grid bushing is installed in the fan-shaped chambers. Generally, there are inverted trapezoidal pores on the grid lining. In the grinding process, the ore particles that meet the granularity requirements enter the fan-shaped cavity through the gap on the grate plate with the pulp. During the rotation of the fan-shaped cavity with end cover, the pulp flows into the hollow journal along the cavity wall of the fan-shaped cavity, and finally is discharged from the mill through the hollow journal to complete the grinding process.
3. Working principle of horizontal ball mill
The appearance of horizontal ball mill is a horizontal cylindrical rotating device, which is driven by gears, sprockets or belts. It is different from lattice and overflow ball mills in that it has two silos. When the barrel of the ball mill starts to rotate, materials are loaded into the barrel through the hollow shaft at the feed end of the ball mill. Due to the interaction of inertia, centrifugal force and friction force, the parabolic motion of the material is realized and the grinding is completed.
The grinding principle diagram of the ball mill originates from the fact that the net-like material enters the first silo of the mill evenly through the hollow shaft of the feeding device, and the silo is internally provided with a stepped lining or a corrugated lining, and steel balls with different specifications are built in. The centrifugal force generated by the rotation of the cylinder brings the copper ball to a certain height and then falls, which has a heavy impact and grinding effect on the material. After rough grinding in the first silo, the materials enter the second silo through the single-layer partition. The dustbin has a flat liner filled with steel balls. The material is further crushed, and the material with finished product granularity is discharged from the discharge end of the cylinder to complete the milling operation.
4. Working principle of conical ball mill
Cone ball mill is similar to horizontal ball mill, driven by external gear and ground in two silos. The principle is the same, except that the second silo of the cone ball mill is inlaid with a flat lining, which completes the further grinding of the material together with the steel ball. Finally, the material is discharged through the discharge grate to finish grinding.
5. Working principle of planetary ball mill
The planetary ball mill is equipped with four ball milling tanks on the same turntable. When the turntable rotates, the ball milling tank revolves around the turntable and makes planetary motion around their respective axes, while the grinding balls in the tank collide with each other in high-speed motion to grind the mixed materials.
Working principle of various types of ball mills