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Ball mill steel ball is the grinding material of the ball mill equipment, passing between the balls of the ball mill Collision friction between steel balls and materials produces wear and tear. Important basic components, especially precision industrial steel balls, play a huge role in the development of the national economy. Widely used in cement plants, power plants, etc. Multi-element low alloy chromium steel balls, the level of Chromium Alloy Casting element.
It plays a huge role in the development of the national economy. Under special conditions, steel balls of special materials are often required to perform the functions required in different environments. In fact, some special material steel balls have been widely used in various fields of the national economy, including high-chromium steel balls ; high-chromium steel forging ; low-chromium steel balls ; low-chromium steel forging ; chromium series liners ; manganese series liners ; hammerheads ; Multi-alloy steel ball ; multi-alloy alloy lining ; various wear-resistant materials ; Their promotion and application not only promote the development of the ball mill steel ball production industry, but also promote the technological development and technological progress of related industries.
The ball mill is the key equipment for crushing the material after it has been crushed.
The ball mill is one of the high-fine grinding machines widely used in industrial production.
There are many types, such as horizontal ball mills, ball mill bushes, energy-saving ball mills, overflow ball mills, ceramic ball mills, lattice ball mills, etc.
The ball mill is suitable for grinding various ores and other materials. It is widely used in mineral processing , building materials and chemical industries. It can be divided into dry and wet grinding methods. According to different mining methods, it can be divided into two types: grid type and overflow type.
Requirements for the diameter of the ball mill ball loaded into the ball mill:
The output of the ball mill is not only affected by the loading of the steel ball, but also by the diameter of the steel ball. It is required to have a certain ball diameter and a ball with different ball diameters to maintain a certain proportional relationship. Generally, the size of the ball diameter in the cylinder is 25-60 mm . If the barrel is a large diameter ball, large impact force, it is advantageous to break large pieces of coal, but because of the large gap between the balls and the surface area is relatively small, extruding, milling weakened, Pulverizer Both output and fineness of coal powder are unfavorable. There are too many small-diameter steel balls in the cylinder, and the impact force is small, which will reduce the output of the coal mill. At the same time, due to the relative increase of the surface area of ​​the steel ball, the wear of the steel ball will increase, and the coal consumption will increase.
For example, during the operation of the coal mill, the weight and diameter of the steel ball are continuously reduced due to wear and tear, so it is necessary to regularly add new balls to maintain a certain amount of steel ball load. Generally, the large diameter ball is replenished, and the ball filling amount should be determined according to the steel ball wear rate (the wear amount per ton of coal ball) and the amount of coal. After the coal mill is running for a certain period of time, the number of small diameter steel balls in the cylinder increases. Therefore, after running for about 3000 hours, it is necessary to stop the steel ball to remove the ball with a diameter of less than 15mm and the broken ball, and make up the new ball at the same time.
Correct use of ball mill steel balls:
The newly installed ball mill has a running-in process. During the running-in process, the amount of steel balls is added for the first time, accounting for 80 % of the maximum ball loading of the ball mill. The proportion of steel balls added can be according to the size of the steel ball ( Φ120 mm, Φ100 mm, Φ80 mm, Φ60 mm, Φ40 mm) size added. Different ball mill models have different ball loadings. For example, the maximum loading capacity of the MQG1500×3000 ball mill is 9.5-10 tons. The first addition of steel balls ( 120 mm and 100 mm) accounted for 30%-40 %, the medium ball 80 mm accounted for 40%-30 %, and the small balls ( 60 and 40 mm) accounted for 30 %.
Why is the ball mill ball volume only 80 % added during the ball mill running-in process? After the ball mill is installed, the ball mill size gear needs to be meshed, and the processing capacity should be gradually increased. After the ball mill is running normally for two or three days, check the meshing of the large and small gears. Wait until everything is normal, open the ball mill manhole cover and add the remaining 20 % steel ball for the second time.
Note: The addition of small steel balls is only the first time with the addition of the ball. Because, when the ball mill is in normal operation, the reasonable friction between the steel ball and the steel ball, the steel ball and the ore, the steel ball and the ball mill liner will increase the wear, make the big ball grind and the middle ball grind into a small ball. Therefore, under normal circumstances, there is no need to add a small ball. In the case of adding a small ball, there is no monomer dissociation at the useful mineral particle size, and when the fineness of the mill is not up to the flotation requirement, an appropriate amount of small balls can be added. In the ball mill, the steel ball wears continuously during the operation. In order to maintain the ball filling rate and the reasonable ratio of the ball and maintain the stable operation of the ball mill, it is necessary to carry out reasonable ball filling and low compensation.
The weight added by the steel ball is determined according to the quality of the steel ball and the quality of the steel ball. The amount of ore consumption is determined. It is better to use a new type of wear-resistant steel ball, such as steel that has been specially forged by a train wheel hub. The ball is particularly wear resistant.
Installation and maintenance of steel ball mill:
Maintenance of the machine is an extremely important and regular task. It should be closely coordinated with the operation and maintenance of the machine. There should be full-time personnel to perform duty checks.
A test installation:
1. The equipment should be installed on a level concrete foundation and fixed with anchor bolts.
2 , the installation should pay attention to the vertical direction of the main body and the horizontal line.
3. After installation, check if the bolts in all parts are loose and the main door is tight. If necessary, tighten.
4. Configure the power cord and control switch according to the power of the device.
5. After the inspection is completed, the empty load test is carried out, and the test can be carried out normally.
Second machine maintenance:
1. The shaft bears the full load of the negative machine, so good lubrication has a great relationship with the bearing life. It directly affects the service life and operation rate of the machine. Therefore, the required oil must be cleaned and the seal must be good. Main oil filling (1) Rotary bearing (2) Roller bearing (3) All gears (4) Active bearing, sliding plane .
2. The newly installed tires are prone to loosening and must be inspected frequently.
3. Pay attention to whether the work of all parts of the machine is normal.
4, pay attention to check the wear level of wearable parts, always pay attention to replace the worn parts.
5. Place the bottom plane of the movable device, and the dust should be removed to prevent the movable bearing from moving on the chassis when the machine encounters unbreakable materials, resulting in serious accidents.
6, the bearing oil temperature rises, should stop immediately to check the reasons to eliminate.
7. If there is impact sound when the rotating gear is running, stop it immediately and check it out.
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