LM Vertical Roller Mill

Product Features: Integration of multiple functions, more stable and reliable production and more excellent capacity

Based on the absorption of advanced technologies of famous international corporations and 30 years’ experience in grinding mill production, SBM has launched the LM Vertical Grinding Mill which integrates five functions of crushing, grinding, powder select

    Input Size: 0-70mm
    Capacity: 3-340TPH
    Material: Limestone, calcite, dolomite, petroleum coal, gypsum, barite, marble, talc, coal powder, etc.

Working Principle

The grinding plate rotates under the action of main motor of LM Vertical Grinding Mill and the reducer. Meanwhile, hot wind enters the vertical mill. After raw materials fall onto the center of grinding plate, they move to the edge of grinding plate under the action of centrifugal force. While passing through the grinding area between roller and grinding plate, bulky materials are broken directly by the pressure of roller while fine materials form a layer where materials crush each other. Broken materials after grinding continue moving to the edge of grinding plate until they are brought away by the airflow at the air ring. For coarse materials which cannot be brought away would fall onto the grinding plate for another grinding. When passing the upper separator, materials in the air flow will be divided into two parts by the blades of rotor, that is, coarse particles and fine powders. Coarse particles would be sent back to have another grinding while the qualified fine powders enter the powder collector with airflow as finished products. For sundries like iron block in materials, when they move to the fringe of grinding plate, because of their heavier weight, they would drop to the lower cavity of grinding mill and next be sent into the discharging port by scarper installed at the bottom of grinding plate and finally be discharged out of the grinding mill.

Performance

Vertical roller mill structure components:

1, disc: including the guide ring, the wind ring, retaining ring, lining, plate, scraping plate and lifting devices.

2, roller: roller sleeve for the wear parts, requiring sufficient toughness and good wear resistance.

3, separator, can be divided into static, dynamic and efficient combination of three types of powder:

The working principle is similar to the cyclone, simple structure, no moving parts, easy to fail. But the adjustment is not flexible, separation efficiency is not high.

This is a high-speed rotation of the cage, dust-laden gas through the cage, the fine particles from the friction into the air, coarse particles directly by the blade collision stopped, the speed of the rotor can be adjusted according to requirements, high speed, The more detailed, and the centrifugal separator principle is the same. It has a higher classification accuracy, fineness control is also very convenient.

The dynamic separator (rotating cage) and static powder (guide fan) together, that is, cylindrical cage as a rotor, in its surrounding are distributed wind guide blades, so that the air flow up and down evenly into the election powder Machine area, coarse and fine powder separation clear, high efficiency. However, this kind of powder machine resistance is larger, so the blade wear is also big.

4, pressure device: hydraulic device, energy storage device.

5, monitoring device: rocker monitoring, vibration monitoring.

6, transmission: motor, reducer.

7, coarse powder outside the circulatory system: hoist.

8, water spray system: reduce the temperature, stabilize the material layer.

Vertical roller mill works:

The mill is driven by the grinding wheel, and the hot air enters the inside of the mill through the air inlet, and the material falls to the center of the grinding disc. Under the action of the centrifugal force, the material moves slowly to the edge of the grinding disc. After the annular groove on the disc, By grinding roller to achieve the crushing effect, the material to be crushed to continue to move to the edge of the disc, and ultimately the airflow at the air ring away, while the particles are still relatively large materials continue to fall on the grinding mill.

When the material in the airflow passes through the upper separator, the coarse material falls from the cone to the disc under the action of the guide vane. The fine powder is discharged together with the airflow and collected by the dust collector of the system. For the vertical roller mill grinding finished products. The drying process of the material is carried out in the course of contact with the gas of the shell, and finally the dry humidity required for the product is achieved. And the fineness required for the material is achieved by adjusting the angle of the separator to guide the blades and the rotational speed of the separator rotor.

Vertical roller mill performance characteristics

LM series vertical roller mill grinding process is the realization of the motor drive disc and roller grinding of the material crushing, the motor through the reducer drive disc rotation, the material by the lock the wind feeder from the feed port in the center of the disc, while hot air from The air inlet enters the mill. When the disc is rotated, the material is crushed by the roller of the roller under the action of centrifugal force. The crushed material is brought by the high speed airflow at the edge of the grinding wheel, and the incomplete material is broken back to the grinding wheel for re-grinding. The coarse powder from the cone to the disc to re-grinding, qualified fine powder with the air together with the mill, collected through the dust collection device. The moisture-containing material is dried during the contact with the hot air, and the moisture content of the product can be met by adjusting the hot air temperature to meet the requirements of the different humidity materials. Product thickness adjustment can be done through the separator, fully meet the user's production standards for materials.

LM series vertical roller mill installation automatic control system, can achieve remote control, easy to operate. Through the maintenance of the cylinder, flip arm, replace the roller sleeve, liner convenient and quick, can reduce the loss of downtime. LM series vertical roller mill equipment as a whole sealed, the system under negative pressure, no dust spill, will not pollute the environment.

Hot air in the mill directly with the material contact, drying ability, energy conservation. By adjusting the hot air temperature, can meet the requirements of different humidity materials. Material in the mill to stay a short time, easy to detect and control the product size and chemical composition, reduce the repeated milling, product quality is more stable. The roller sleeve and the disc liner are provided with means to prevent direct contact to avoid destructive shocks and severe vibrations. LM series vertical roller mill structure is reasonable, so the vibration is small, low noise.

LM series vertical roller mill set broken, dry, grinding, graded transport in one, compact layout, covers an area of ​​only 50% of the ball mill system. Roller in the disc directly crushed grinding materials, energy consumption than the ball mill system by 30% -40%. Roller and liner using high-quality materials, reduce wear and prolong the service life.

Analysis on the Harmfulness and Cause of Increasing Noise in vertical roller mill Operation

In general, the mill is running, the resulting sound is very regular, people hear and will not feel irritable. However, if the noise generated by the vertical roller mill is not normal and affects the normal operation of the person, the operator will have to consider whether the mill has failed. Great Wall mechanical grinding experts combined with decades of production experience, summed up the three causes of noise reasons:

 

Product Parameters

 

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