The role and introduction of the Vertical roller mill accessories grinding roller

The role and introduction of the Vertical roller mill accessories grinding roller

SBM heavy machine grinding roller is a new type of grinding equipment designed, developed and developed in combination with German Loesche grinding roller technology. Its grinding roller is completely different from ball milling. It can simultaneously dry, grind and classify materials. The process is simple, compared with the ball mill roller, the floor space is small, the unit power consumption is low, the metal wear is small, the machine noise is low, the grinding efficiency is high, and the kiln tail gas can be utilized in a large amount. The Vertical roller mill production capacity depends on the specifications of the Vertical roller mill. For example, the raw material output of the tln Vertical roller mill is 185 tons/hour. Tln Vertical roller mill has a raw meal yield of 45 tons / hour. If you need other specifications of Vertical roller mill output, please provide the specifications. Sometimes there may be some errors due to the large difference in the material being ground. The material is placed in the middle of the grinding disc through the 3 lock valve and the cutting slip into the mill. The rotation of the grinding disc drives the grinding roller to rotate. The material is moved toward the edge of the disc by centrifugal force and is crushed by being caught at the bottom of the grinding roller. The grinding roller is pressurized by a hydraulic system to meet the grinding needs. When the material is in the working area of ​​the grinding roller grinding device, the bulk material is directly crushed, and the fine material is pressed to form a material bed for intergranular pulverization. In the middle of the particle bed, one particle rubs against the other, causing the edges and edges to fall and being comminuted. The pulverized fine powder group is immediately exposed to the high-speed airflow outside the disk, and the dense fine powder is dispersed and brought into the classifier or folded back according to the size, and the buffering effect of the fine fine powder cushion layer is reduced to a low level.

The technical characteristics of the surface of the toothed roller mainly refer to the number of teeth of the grinding surface on the surface of the roller, the angle of the tooth, the plane of the tooth tip, the inclination and the arrangement of the two grinding rollers, the average speed and the speed ratio.

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(1) Number of grinding rollers of Vertical roller mill

The number of teeth is related to the size of the abrasive material, the flow rate and the degree of comminution required. For example, when the particle size and flow rate of the grinding material are large or the grinding material is required to be coarse, the number of teeth should be less; otherwise, the number of teeth should be configured. Under the same conditions, the smaller the number of grinding rollers, the larger the distance between the two grinding teeth, and the deeper the groove, it is only suitable for grinding large particles. If it is used to grind fine materials, the material will be embedded in the groove and will not be ground. The more the number of teeth of the grinding roller, the smaller the distance between the two grinding teeth, and the shallower the groove, it is only suitable for grinding small particles. If it is used to grind large particles of material, when the flow rate is small, the wheat husk is easily ground and crushed. When the flow rate is large, the middle portion of the material is not sufficiently ground, the grinding teeth are easily worn, the output is low, and the power consumption is high.

(2) Vertical roller mill grinding roller angle

The tooth angle is divided into a rake angle and a back angle. During the grinding process, the material falls between the two grinding rolls and is held by the slow rolls, and the material is pulverized by the fast rolls. The amount of force applied to the material between the rolls is mainly determined by the rake angle. When the current angle is reduced, the shearing force is increased, the pressing force is reduced, the shearing and crushing action of the material is strengthened, the stripping rate is increased, the proportion of the slag core in the grinding material is increased, the amount of fine powder is reduced, and the skin layer is fragile, powder The number of medium bran stars increases, the quality may decrease, but the higher material flow rate can be treated with lower power consumption; when the current angle increases, the shear force decreases, the pressing force increases, and the effect of the pressing force dominates. The proportion of slag core in the grinding material is reduced, the amount of fine powder is increased, the cortex is not easily broken, the quality of the flour is good, but the crushing ability is decreased, the dynamic consumption is high, and the treatment flow rate is low.

(3) Vertical roller mill grinding roller top plane

The new brushed tooth tip should not be too sharp, and should have a certain top plane according to the size of the grinding tooth. The top surface of the tooth can achieve a gentle crushing effect on the material and reduce the generation of bran. It can ensure the precise cylindrical shape after the drawing of the grinding roller, improve the running stability, improve the service life of the grinding roller and stabilize the running state of the powder path.

(4) Vertical roller mill grinding roller slope

The grinding pitch is the key to the intersection of the two grinding rolls to the material and the stripping and grinding. If the grinding teeth have no inclination, the grinding teeth of the fast and slow rollers will be parallel to each other. During the grinding, unstable and mis-engagement will occur between the two rollers, which not only makes it easy to cut the bran into a filament, but also grinds the roller. Vibration is generated to affect the grinding effect. Grinding teeth must not only have a slope but must also be properly installed. The two-roll grinding teeth form a plurality of intersections on the two sides of the grinding zone. When the pair of grinding rollers rotate in opposite directions, the fast roller grinding teeth and the slow roller grinding teeth form a plurality of intersections, and the rolling distance between the grinding rollers is smaller than In the case of abrasive materials, the material is subjected to relatively strong shear at the intersection. When the number of intersections in the grinding zone is large, the average chance of material being sheared in the zone will increase, and the crushing ability of the equipment will be enhanced.

(5) Vertical roller mill grinding roller arrangement

When the blunt pair is bluntly arranged, the fast and slow roller grinding teeth adopt a large rake angle, the pressing force on the material is large, the shearing force is small, the crushing effect is moderate, the bran piece in the grinding is large, the slag and the heart are less and the flour is more The powder contains less bran and good quality, but the power consumption is higher. Suitable for processing hard wheat, low moisture wheat and requiring bran integrity and low flow. When the front is aligned, the shearing effect on the material is strong, so the degree of breakage is high, the power consumption is low, the bran pieces in the grinding are relatively broken, the slag and the heart are small and the fine powder is small, and it is suitable for processing soft wheat and high moisture. Wheat and high flow requirements.

(6) Average speed of Vertical roller mill roller

The grinding roller is divided into a fast roller and a slow roller, each having a certain rotation speed, and the rotation speed of the grinding roller is generally determined by the fast roller rotation speed. The higher the speed, the higher the line speed of the fast and slow rolls and the higher the average line speed. The average line speed of the two grinding rolls is related to the treatment flow rate. The higher the average line speed, the larger the treatment flow rate and the higher the output of the mill.

(7) Vertical roller mill grinding roller speed ratio

If other conditions are not changed, the speed is relatively large and the grinding effect on the material is stronger. The higher the speed ratio, the more the number of stripping teeth, the more times the material is stripped, the degree of pulverization will obviously increase; but the gluten is brittle, the ash of slag, heart and powder increases, and the power consumption also increases. Therefore, the selection of the speed ratio must be compatible with the process, the nature of the raw materials, the grinding requirements, and the like.

(8) The degree of grinding of the grinding wheel of the Vertical roller mill

The newly drawn grinding roller has a sharper tooth angle and a stronger grinding effect. That is, the stripping rate is high, the bran sheet is brittle, the granular material is large, the fine powder is small, the power consumption is low, and the high flow rate can be adapted. However, after a period of use, the tooth angle becomes dull, the grinding effect is reduced, the yield is lowered, the bran sheet is large in the milled material, the flour is large, the slag particles are reduced, and the grinding temperature is increased, and the power consumption is particularly prominent.

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