Details of ball mill equipment structure and working principle

The ball mill is the key equipment for crushing the material after it is crushed. This type of grinding machine is to put a certain number of steel balls in its barrel as grinding medium. It is widely used in cement, silicate products, new building materials, refractory materials, fertilizers, ferrous and non-ferrous metal beneficiation and glass ceramics and other production industries, dry or wet grinding of various ores and other grindable materials. Ball mills are suitable for grinding various ores and other materials. They are widely used in mineral processing, building materials and chemical industries. They can be divided into dry and wet grinding methods. According to different discharge methods, it can be divided into grid type and overflow type.

Ball mill equipment composition

The internal structure of the ball mill is relatively complex, with many components. The main components include the cylinder body, the lining plate, the compartment plate (only available in multi-silo mills), the main bearing, the feeding and discharging device, and the transmission system. Among them, the transmission parts of the ball mill include V-belt, motor, reducer and pulley.

1. Cylinder: It is one of the important parts of the ball mill. In addition to bearing the static load of the grinding body, the cylinder also bears the impact of the grinding body, and the cylinder is rotating, so what is produced on the cylinder is alternating stress. In order to ensure the grinding efficiency of the cylinder, a lining plate will be installed in the cylinder.

2. Main bearing: The ball mill bearing is mainly the part that supports the rotation of the ball mill. Commonly used bearings include sliding bearings and rolling bearings. No matter which kind of bearing is very important for its lubrication requirements, it is generally used for concentrated circulating lubrication of thin oil, and there are also small machines. The use of oil ring lubrication, oil ring drip lubrication or wool lubrication.

3. End cover: It is located at both ends of the cylinder and is connected with the flange at the bottom of the cylinder by screws. There is a small hole in the middle to ensure the smooth discharge of exhaust gas.

Large gear ring: fixed on the barrel.

Ball mill for gold mining working principle

The grinding process of the ball mill is carried out in the barrel of the ball mill, and the motor drives the rotation of the barrel and the gear ring through the coupling, the reducer and the pinion. After the cylinder rotates, the steel ball medium loaded inside and the fed materials will rotate along with the rotation of the cylinder. When the moving height is reached, they will be thrown to the bottom of the ball mill cylinder. Before the cylinder and the steel ball, friction force will be generated, and the impact force between the three phases will increase during the throwing process, and the friction force generated at the same time will produce grinding and exploiting work on the ore, so the grinding operation of the material is completed. , the materials that meet the qualified requirements will be discharged through the mine discharge.

Different ball mills work slightly differently:

1. The working principle of overflow ball mill

The working principle of the overflow type ball mill is mainly supported by rolling bearings. The cylinder is rotated through the transmission device, so that the material and the steel balls rotate together with the cylinder, and the throwing, impact, impact and self-grinding operations are completed in the cylinder to realize the material grinding. In the case of continuous feeding of materials, the pressure will cause the materials in the cylinder to be gradually discharged to the discharge end. When the pulp is higher than the lower edge of the hollow shaft at the discharge end, the material will overflow by itself, and the steel at the discharge end will overflow. The balls and coarse materials will be returned to the mill by the reverse helical blade for further grinding.

2. Working principle of grid ball mill

The working principle of the grid type ball mill is roughly similar to that of the overflow type. The difference is that the grid ball mill is equipped with a grid plate at the discharge place, which is installed in the end cover of the hollow journal at the end cover of the beating end. It is composed of eight radioactive ribs, and the end cover is divided into eight fan-shaped chambers. The shape lining plate is fixed inside the fan-shaped chamber with bolts, and then the lattice lining plate is installed on the fan-shaped chamber. Among them, there are inverted trapezoidal pores on the grid lining plate. During the grinding process, the ore particles that meet the particle size requirements will enter the fan-shaped chamber through the gaps on the grid plate with the pulp. The fan-shaped chamber rotates with the end cover. The chamber wall flows into the hollow journal and is discharged from the ball mill through the hollow journal to complete the crushing process.

3. Working principle of horizontal ball mill

The appearance of the horizontal ball mill is a horizontal cylindrical rotating device, and the outer gear, sprocket or belt drive, it is different from the lattice and the overflow ball mill in that it has two material bins. When the cylinder starts to rotate, the material is loaded into the cylinder by the hollow shaft at the feeding end, and the combined action of inertia, centrifugal force and friction force is used to realize the material parabolic operation and complete the grinding. The material enters the first chamber of the mill evenly and spirally through the feeding hollow shaft of the feeding device. There is a stepped lining plate or a corrugated lining plate in the chamber, and steel balls of different specifications are built in. The centrifugal force generated by the rotation of the cylinder brings the copper balls to the mill. After falling from a certain height, it will have a heavy impact and grinding effect on the material. After the material reaches the rough grinding in the first warehouse, it enters the second warehouse through the single-layer partition board. The flat lining board is inlaid in the cabin, and there are steel balls in it. The discharge end is discharged to complete the powder operation.

4. The working principle of the cone ball mill The cone ball mill is similar to the horizontal ball mill. It is driven by an outer gear and has two bins. The principle is the same. Grinding, as a result, the material is discharged through the discharge grate to complete the grinding.

5. Working principle of planetary ball mill

The planetary ball mill is equipped with four ball mill jars on the same turntable. When the turntable rotates, the ball mill jar will autobiography around its own axis while revolving around the turntable, making a planetary motion, and the grinding balls in the jar collide with each other in high-speed motion, grinding and mixing materials.