With the advancement of technology, new material liners have also begun to be used in vertical roller mill. For example, a composite liner composed of rubber and cemented carbide steel can ideally solve the contradiction between the toughness and rigidity of the liner and reduce the liner. The impact force received during operation. 

Compared with ordinary liners, the heat resistance and strength of composite liners have been greatly improved. Especially in terms of service life, composite liners are twice as effective as traditional liners, which greatly improves the economic benefits of enterprises. In addition, the composite liner has low working noise, light weight, and is easy to promote, but it lacks practice. However, there is a lot of room for development in dealing with the problems of liner aging and liner wear.

Pay attention to the heating and cooling operation of the vertical roller mill. Most manufacturers do not pay attention to the heating and cooling operations of vertical roller mills, and fail to realize that reasonable heating and cooling operations can prolong the service life of key large bearings and wear parts.

Reasonable heating rate can heat the roller sleeve, liner plate and bearing uniformly, thereby prolonging the service life of the liner plate, roller sleeve and key bearing. Among the spare parts of the vertical roller mill, the price of these key parts is relatively expensive, and any one of them is damaged. Will directly affect the operation cycle of the vertical roller mill.

When welding construction in the vertical roller mill, attention must be paid to the connection and grounding of the welded parts. Welding current must not pass through the bearing or twisted point, otherwise it will damage the bearing or twisted point.

The vacuum degree of the oil return pipe of the grinding roller determines the oil level in the grinding roller cavity. The adjustment of the vacuum degree and pressure is directly related to the lubrication state of the grinding roller bearing. If the oil level is too high or too low, it will cause oil leakage or bearing damage to the grinding roller.

Due to the importance of the roller lubrication system to the bearing of the vertical roller mill, a simple method can be used to quickly diagnose whether the roller bearing is faulty in normal production:

One is to observe the oil condition in the grinding roll on site, or to determine whether the bearing of the grinding roll is damaged by detecting the content of metal particles in the oil sample. If the content of metal particles in the oil sample is high, the bearing has been seriously damaged.

The second is to observe the oil return temperature of the grinding roller. If the oil return temperature of a certain grinding roller rises and the return oil temperature of other grinding rollers is normal, it indicates that the bearing of the grinding roller is damaged.

Cause Analysis:

Roller bearings pay special attention to the quality of the bearings, but they will also experience local damage during long-term operation, such as ball wear, loose joints, and so on. At this time, the temperature of the roller bearing will definitely be abnormal.

Approach:

When the surface of the grinding roller bearing is uneven, local rotation is blocked, the left and right swing amplitude is increased, and internal noise occurs; or the bearing temperature is overloaded or fluctuates at the moment when ultrafine vertical mill is turned on, the production should be stopped immediately, and maintenance inspection or disassembly should be carried out. , If the damage is serious, the grinding roller bearing should be replaced in time to ensure production safety.

In particular, the abnormal temperature of the roller bearing will cause the electric switch of ultrafine vertical mill to be cut off frequently, which will seriously affect the production schedule. Today, the editor summarized the common causes and treatment methods of abnormal grinding roller bearing temperature, hoping to help everyone's production.

In order to ensure the lubrication of the roller bearings, when choosing ultrafine vertical mill lubricating oil, try to choose a synthetic grease with viscosity and stability at high temperatures. The ultrafine vertical mill lubricating oil must be replaced in time every time the bearing has been running for four months, and the ultrafine vertical mill lubricating oil must not be less than 40 liters each time.

For the problem of excessively large particle size in the production of ultrafine vertical mill, it may be caused by spring wear or excessive gap between the spring and the high-pressure plate. Therefore, the spring needs to be replaced or adjusted, and the spring and the high-pressure plate The gap is generally kept between 15-20 mm;

The bearing heating problem in the production of ultrafine vertical mill generally requires lubrication or replacement of the bearing, and the tightness of the upper cover must be moderate;

The point: For the abnormal vibration in the production of ultra-fine mills, it may be caused by the size of the feed or uneven wear, unbalanced grinding rolls, improper foundation treatment, etc., so you only need to ensure that the feed size is appropriate And to replace the worn parts to ensure the stability of the foundation, such as checking and strengthening the anchor bolts.

The content of high-quality and daily maintenance mentioned above is more detailed, so customers only need to choose high-quality equipment and maintain ultrafine vertical mill in accordance with the manufacturer's requirements to ensure that ultrafine vertical mill brings good production benefits to the production process.

The maintenance of this part is divided into the inspection and repair of the moving blades and the static blades. When the moving blades are overhauled, they need to be vibrated with a hand hammer one by one. See if there is any movement of the blade. If so, it needs to be fastened, marked, and welded and strengthened.

In the interior of the vertical roller mill, the material after the sorter is ground and dried enters the part along with the air flow from the lower part for sorting operation. The purpose of sorting is to obtain a better quality of the finished product. There are moving and static blades, and the welding must be firm, otherwise it will cause accidents such as shutdown.

Remove the five moving blades in each layer of the squirrel cage of the fine grinder to leave enough space to observe the connection and wear of the stationary blades. Rotate the squirrel cage to check whether the connection of the stationary blades is welded or worn. The grinding parts need to be welded firmly with J506/Ф3.2 welding rod. Adjust the angle of the stationary blades, the vertical distance is 110 mm, and the horizontal angle is 17° to ensure the quality of powder selection.

The vertical roller mill separator and the louver ring are one of the important internal parts. When they are working, they will also encounter some problems. The solution of these problems is an important condition to ensure the smooth operation of the machine, and then for these parts The maintenance of these two parts is also very important, so that failures can be prevented in time. In this article, we are going to analyze the maintenance of these two parts.

Remove the five moving blades in each layer of the squirrel cage of the fine grinder to leave enough space to observe the connection and wear of the stationary blades. Rotate the squirrel cage to check whether the connection of the stationary blades is welded or worn. The grinding parts need to be welded firmly with J506/Ф3.2 welding rod. Adjust the angle of the stationary blades, the vertical distance is 110 mm, and the horizontal angle is 17° to ensure the quality of powder selection.

The article mainly introduces the problem of how to repair the sorter and the louver ring of the vertical roller mill. The maintenance is an operation performed before the fault has occurred. The purpose is to detect the existence of the fault in time and is important to reduce the occurrence of the fault. In addition to these two parts, maintenance is also very important for other parts in raw tea.

LUM series ultra-fine vertical mills are mainly composed of electric motors, reducers, grinding roller devices, grinding disc devices, pressurizing devices, powder separators, machine bodies and oil stations. When working, the main machine motor drives the grinding disc to rotate through the reducer, and the screw feeder feeds the material into the main machine.
After that, the material falls into the grinding disc. Under the action of the centrifugal force of the grinding disc, the material moves around and enters the roller table area and is subjected to the grinding roller. Of rolling. The crushed materials continue to move around, and enter the powder classifier with the airflow of the fan for classification.
Under the action of the powder separator blades, the materials that meet the particle size requirements of the powder separator enter the pulse dust collector for collection, and are discharged by the discharge valve to become the finished product. The materials that do not meet the particle size requirements of the powder separator return to the main machine and pass through the grinding roller. Grind.