How to listen to the sound of the ball mill, what is the matter with the sound of the ball mill

1. The main sound of the ball mill is generated by the collision between the grinding medium and the grinding medium, between the grinding medium and the material, and between the grinding medium and the ball mill barrel. The grinding method is generally roughly divided into dry grinding and wet grinding, dry grinding refers to the grinding of materials directly into the grinding cavity, and does not add other liquids, so the noise of dry grinding is the largest; Wet grinding is the opposite of dry grinding, and several liquids can be added according to the production process, generally clean water. Generally based on experience, if the equipment is not abnormal at the time of design, the noise of the grinding chamber is normal.

2. The second is the transmission mechanism. This part is mainly motors, reducers, transmission parts (such as sprockets, gears, etc.). For example, sprocket transmission, under normal circumstances, the friction sound between the chain and the sprocket is very regular, if you find intermittent friction sound, it means that at least one of the sprocket mechanism has a deviation in the installation position.

There are two kinds of grinding medium in ball mill and forging, and the ball is not as fine as forging and grinding in the case of balls. If you listen to the sound, you should listen to the sound of the ball dropping, if the drop is large, it proves that the ball has worn out, and you need to add a new ball!

The ball mill is indeed a burst of bursts, as long as there is no violent imbalance of the array, the number of balls added is related to the materials you process, can be customized.

Dear, hello I'm glad to answer for you: The reason why the sound of the ball mill is as follows: during the operation of the ball mill, if there is a regular knocking sound and the sound is very loud, this situation means that part of the bolts of the liner are loose, and the liner knocks on the wall of the cylinder with the operation of the cylinder.

At this time, we can find out where the bolt is loose according to the direction of the sound and retighten the bolt. The sound of the ball mill reducer running is abnormal. The sound of the normal operation of the reducer should be uniform and stable.

If the ball mill makes a slight knocking sound and a hoarse grinding sound, and there is no obvious change in operation, you can continue to observe and find out the cause. If the ball mill is getting louder, it should be stopped immediately for inspection. Ball mill is one of the main grinding equipment of Xinxiang Great Wall, which is widely used in the mining chemical industry, mainly grinding all kinds of ores.

The ball mill has been running for a long time, and if it is not overhauled properly, it is inevitable that there will be some failures in the Chang Hall, so it is still necessary to pay attention to the usual maintenance.

Ball mill is one of the widely used high fine grinding machinery in industrial production.

There are many types of it, such as hand ball mill, horizontal ball mill, ball mill bearing, energy-saving ball mill, overflow ball mill, ceramic ball mill, lattice ball mill and so on.

Zhengzhou Zhongheng Machinery is a professional manufacturer of ball mills, cement ball mills, batch ball mills, cone ball mills, ceramic ball mills, lattice ball mills, tubular ball mills and other equipment

Ball mill. As a general equipment, it is widely used in mineral processing, building materials and chemical industries, and can be divided into dry and wet grinding methods. According to the different discharge methods, it can be divided into two types: lattice type and overflow type.

The ball mill is the key equipment for crushing the material after it is crushed.

The following methods can make a ball mill.

Noise elimination: 1) Design a soundproof room. When conditions permit, the ball mill is concentrated in a special ball mill room, and the ball mill room is transformed into a special sound insulation room, which will have a better effect than the sound insulation cover, but attention must be paid to solving the monitoring, indoor heat dissipation and maintenance problems in the operation of the ball mill.

2）.By replacing the manganese steel lining with a rubber lining, the noise level can be reduced by 9dB(a), and the spectral characteristics can also be changed from high frequency to low frequency.

3）.Set up the elastic layer. In order to prevent the soft rubber pad from overheating, the industrial felt with a thickness of 10-15mm is laid between the ball mill liner and the soft rubber pad, which can reduce the noise of the ball mill to below the allowable standard.

4）.Add an acoustic enclosure. The steel structure skeleton is adopted, the shell is made of thin steel plate, and the damping layer is smeared and filled with ultra-fine glass wool or other sound-absorbing materials to close the whole ball mill.

Since the ball mill generates a large amount of heat during operation, it is necessary to pay attention to the heat dissipation in the hood and facilitate the maintenance of the equipment.

5）.Cover the drum wall with an acoustic insulation layer. A layer of 50mm thick industrial felt is tied on the outer wall of the ball mill drum, and the thick steel plate is used as the protective surface, and it is fixed on the outer wall of the drum with bolts, and the actual sound insulation value is about 12db(a).

If the same treatment is done at both ends of the drum, the seams wrapped on the drum wall are sealed, and the sound insulation effect may be improved.

The raw material is fed into a hollow cylinder for grinding by means of a hollow journal repentance macro, which is filled with grinding media of various diameters (steel balls, steel rods or gravel, etc.). When the cylinder rotates at a certain speed around the horizontal axis, the medium and raw materials packed in the cylinder under the action of centrifugal force and friction force reach a certain height as the cylinder reaches a certain height, when its own gravity is greater than the centrifugal force, it will fall or roll down from the inner wall of the cylinder, and crush the ore due to the impact force. At the same time, in the process of mill rotation, the sliding movement of the grinding medium between each other also has a grinding effect on the raw materials.

The ground material is discharged through the hollow journal. In order for the material to be effectively pulverized, the following principles must be followed when determining the gradation:

First of all, the steel ball should have a large enough impact force to make the ball mill steel ball have enough energy to break the granular material, which is directly related to the maximum ball diameter of the steel ball.

Secondly, the steel ball should have enough impact times on the material, which is related to the filling rate of the steel ball and the average ball diameter. When the filling amount is constant, on the premise of ensuring sufficient impact force, the diameter of the grinding body should be reduced as much as possible, and the number of steel balls should be increased to improve the impact times on the material, so as to improve the crushing efficiency.

Finally, the material has enough residence time in the mill to ensure that the material is fully crushed, which requires the steel ball to have a certain ability to control the flow rate of the material.

Sobi is called the two-stage ball matching method, which is to use two different sizes of steel balls, and the diameter difference between the two is large for grading. The rationale is that the gaps between the large balls are filled by small balls to maximize the bulk density of the steel balls. In this way, on the one hand, the impact capacity and impact number of the mill can be improved, which is in line with the functional characteristics of the grinding body, and on the other hand, the higher bulk density can enable the material to get a certain grinding effect.

In the two-stage ball matching, the role of the large ball is mainly to impact and crush the material, and the role of the small ball is to fill the gap between the large balls and improve the bulk density of the grinding body, so as to control the flow rate of the material and increase the grinding capacity; the second is to play the role of energy transfer, transferring the impact energy of the large ball to the material; The third is to squeeze out the coarse-grained materials in the void and place them in the impact area of the large ball.

The ball mill is composed of feeding department, discharging department, rotary department, transmission part (reducer, small transmission gear, motor, electronic control) and other main parts. The hollow shaft is made of steel castings, the lining can be replaced, the slewing gear is processed by casting gear hobbing, and the cylinder is inlaid with a wear-resistant lining plate, which has good wear resistance. This machine runs smoothly and works reliably.

The main engine of the ball mill includes a cylinder, which is inlaid with a lining made of wear-resistant materials, a bearing that carries the cylinder and maintains its rotation, and a driving part, such as an electric motor, and a transmission gear, a pulley, a V-belt, etc. Regarding the parts called blades, they are generally not the main components, and there is an inner spiral in the inlet of the component at the feeding end that can be called its inner spiral blade, and an inner spiral in the component outlet at the discharging end can also be called its inner spiral blade. In addition, if a screw conveyor is used in the auxiliary equipment at the discharge end, there will be parts called spiral blades in the equipment, but strictly speaking, it is no longer counted as a part of the ball mill.

Depending on the material and discharge method, dry ball mill and wet lattice ball mill can be selected. The energy-saving ball mill adopts self-aligning double-row radial spherical roller bearings, which has low running resistance and remarkable energy-saving effect. In the cylinder part, a section of conical cylinder is added at the discharge end of the original cylinder, which not only increases the effective volume of the mill, but also makes the distribution of medium in the cylinder more reasonable.

This product is widely used in non-ferrous metals, dry guess ferrous metals, non-metallic beneficiation hail yards and chemical industry, building materials industry for material grinding.

The ball mill is the key equipment for crushing the material after it is crushed. This type of grinding machine is filled with a certain number of steel balls as grinding medium in its cylinder. It is widely used in cement, Portland products, new building materials, refractory wide dust hand materials, fertilizers, black and non-ferrous metal beneficiation and glass ceramics and other production industries, dry or wet grinding of various ores and other grinding materials.

The ball mill is suitable for grinding all kinds of ore and other materials, and is widely used in mineral processing, building materials and chemical industries, which can be divided into dry and wet grinding methods. According to the different discharge methods, it can be divided into two types: lattice type and overflow type. According to the shape of the cylinder, it can be divided into four types: short drum ball mill, long drum ball mill, tube mill and cone mill.

The ball mill is composed of a horizontal cylinder, a hollow shaft and a grinding head for the inlet and outfeed, the cylinder is a long cylinder, the cylinder is equipped with a grinding body, the cylinder is made of steel plate, there is a steel lining plate and the cylinder is fixed, the grinding body is generally a steel ball, and is loaded into the cylinder according to different diameters and a certain proportion, and the grinding body can also be used in steel sections.

According to the particle size of the grinding material to be selected, the material is loaded into the cylinder by the hollow shaft at the feed end of the ball mill, when the ball mill cylinder rotates, the grinding body is attached to the cylinder lining plate due to the action of inertia and centrifugal force, the effect of friction, so that it is attached to the cylinder lining plate and is taken away by the cylinder, when it is brought to a certain height, it is thrown down due to its own gravity, and the falling grinding body crushes the material in the cylinder like a projectile. The material is uniformly entered into the first bin of the mill by the feeding device through the feeding hollow shaft spiral, which has a stepped lining plate or corrugated lining plate, which is filled with steel balls of various specifications, and the cylinder rotates to produce centrifugal force to bring the steel balls to a certain height and fall, which has a heavy impact and grinding effect on the materials. After the material reaches coarse grinding in the first bin, it enters the second bin through a single-layer bin plate, which is inlaid with a flat lining plate and has a steel ball in it, and the material is further ground.

The powder is discharged through the discharge grate to complete the grinding operation. In the process of rotation of the cylinder, the grinding body also has the phenomenon of slipping, in the process of sliding to the material to grind, in order to effectively use the grinding effect, the general 20 mesh grinding of the material particle size is larger, the grinding body cylinder is separated into two sections with a partition plate, that is, it becomes a double bin, the material is crushed by the steel ball when it enters the first bin, when the material enters the second bin, the steel section grinds the material, and the material that is fine and qualified is discharged from the hollow shaft at the discharge end, and the material with small feed particles is ground finely, such as sand No. 2 slag, For coarse fly ash, the mill barrel can be made without a partition plate to become a single silo mill, and the grinding body can also be made of steel sections.

When the material enters the mill from the feeder through the feed pipe, and the slurry surface in the cylinder is higher than the minimum bus level of the inner diameter of the discharge pipe, the ground material can be discharged from the discharge pipe outside the machine. This kind of mill is manufactured because the end of the discharge pipe in the hollow journal of the row expansion end cover is made into a horn type, and usually an annular retaining ring is installed at the root of the hollow shaft, which can prevent the slurry leaking from the bolt hole of the end cover from flowing into the bearing. At the same time, a spiral is cast in the discharge pipe, and the direction of the spiral is opposite to the direction of the mill, so as to prevent the steel balls and the mine from being discharged out of the machine with the slurry.

However, the production capacity of the machine per unit volume is low, and it is easy to produce over-crushing. Because the machine is relatively grinding time, the ore can be fully ground in the machine, and the residence time is also longer, so the grinding product has a finer particle size, so this kind of grinding machine is usually used for stage grinding, suitable for concentrate re-grinding and rotten industry, and can obtain qualified products with fine particle size.

Ball Mill Noise**.

The main noise of the ball mill is the mechanical noise caused by the collision between the steel ball in the drum and the lining plate of the cylinder wall and the processed material. This sound radiates outward along the lining plate, cylinder wall, and inlet and outlet ports, including: the impact sound of the material, the impact sound between the steel ball and the steel ball, the steel ball and the lining steel plate, and the friction sound.

In addition, there is also the sound of the motor, the vibration noise of the conveyor during the operation of the equipment, etc.

Ways to reduce the noise of the ball mill.

1. Install the gears correctly.

The gear collision of the transmission system will make noise, so in the process of ball mill installation, special attention should be paid to the installation of gears, and the overlap, gap and modulus of the gears should be controlled within a reasonable error range.

2. Add a sound insulation cover or a damping sound insulation layer to the cylinder of the ball mill.

The collision between the lining plate in the cylinder and the material and the grinding medium will make noise, and the solution is to install a sound insulation cover outside the cylinder, but the sound insulation cover also has drawbacks, which will affect ventilation and heat dissipation, and also brings trouble to the later overhaul and maintenance, and the damping sound insulation layer avoids this trouble, and the specific operation method is to do a floating clamp type damping sound insulation sleeve on the cylinder shell, and the cylinder is wrapped with a damping sound insulation layer, which can reduce the noise 12 15db (a).

3. Use sound insulation materials, such as sound insulation covers, sound insulation screens, etc.