JP2018001055A - Vertical crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem in which theoretical classification points are different between the upper and lower sides of a rotation-classifying blade when a casing shape of a classifying mechanism is partly a truncated cone shape whose diameter reduces from the lower side to the upper side, in a vertical crusher having a rotation classifying mechanism.SOLUTION: A rotation classifying blade is formed and divided into several blades in a vertical direction, and the inclination angle of the rotation classifying blade is inclined in the rotation direction of the rotation classifying blade toward the inner peripheral side from the outer peripheral side of a revolving orbit of the rotation classifying blade. The upper part and the lower part of the rotation classifying blade have different inclination angles, and the rotation classifying blade is formed in such a manner that the inclination angle of the upper part is larger than that of the lower part. The present invention can reduce effect on a gas stream velocity caused by reduction of the diameter of a classifying blade casing with use of the strength of revolving stream generated by the inclination angle of the rotation classifying blade, which allows the rotation classifying blade to be uniformly classified in the vertical direction.SELECTED DRAWING: Figure 1

Description

  The present invention mainly relates to a vertical pulverizer that pulverizes cement raw material, clinker, limestone, coal, biomass, and other inorganic raw materials, and more particularly to a suitable vertical pulverizer that finely pulverizes the raw material.

As an apparatus for efficiently pulverizing raw materials, a pulverizer called a vertical pulverizer (sometimes referred to as a vertical mill or a vertical roller mill) is used.
The vertical pulverizer has an excellent characteristic that it can efficiently pulverize a material to be crushed (sometimes simply referred to as a raw material in this specification).

The basic crushing behavior of the vertical crusher will be briefly described.
The vertical crusher has a crushing roller disposed on a rotary table, and the crushing roller is configured to be pressed in the direction of the rotary table. When the rotary table rotates, the crushing roller is driven and rotated via the raw material with respect to the rotary table.

The raw material charged into the vertical crusher is charged onto the rotary table via a chute for raw material charging, etc., is bitten by a pulverizing roller, and is pulverized. The raw material that is pulverized by being squeezed between the rotary table and the pulverizing roller travels to an annular gap between the outer peripheral portion of the rotary table and the casing.

  There are various types of vertical pulverizers. In the case of vertical pulverizers (sometimes called air-swept type), which are excellent for finely pulverizing and taking out raw materials, a rotary table is used. Gas is introduced from below, and an air flow of gas flowing from below to above is generated in the machine. Most of the raw material that has flowed into the above-described annular gap is blown up by the gas stream and travels upward in the machine. And the raw material used as the desired dimension is taken out with gas from the upper extraction port distribute | arranged above the turntable.

  The raw material that has not been pulverized to the desired size is not blown up by the gas and falls directly below the table, or even once blown up by the gas, it deviates from the gas flow before reaching the upper outlet. It is dropped and crushed again, such as by dropping on a rotating table. That is, when the raw material is finely pulverized, the raw material that could not be finely pulverized to a desired particle size by one pulverization is repeatedly pulverized in the machine.

  Here, conventionally, for the purpose of improving the classification efficiency, a vertical crusher provided with a classification mechanism in the upper part of the machine is often used. There are various classification mechanisms. As a typical classification mechanism, for example, a type that improves the efficiency of classification by arranging fixed classification blades in the machine and rectifies the air flow of gas flowing in the machine, and gas that flows in the machine by arranging rotary classification blades In general, a type that improves the classification efficiency by strongly swirling the air current, and a type that improves both the fixed classification blade and the rotary classification blade to improve the classification efficiency are generally well known.

  In recent years, when pulverizing raw materials, a type of vertical crusher equipped with both stationary and rotary classification blades is often used as a vertical type crusher with excellent classification ability. It has become to. In the vertical crusher of the type having both the fixed type and the rotary type described above, a fixed classifying blade for rectification (sometimes referred to as a guide vane) is arranged on the outer peripheral side of the rotary type classifying blade. Cases that employ a classification mechanism are common. Patent Document 1 shows an example of a vertical crusher provided with a classification mechanism in which a rectifying fixed classification blade is arranged on the outer peripheral side of a rotary classification blade.

JP 2006-110521 A

Here, there is a case in which a classifier casing 101B having a shape shown in FIG. 5 (1) is employed for the purpose of smoothly flowing a gas flow inside the vertical grinder.
In the classifier casing 101B shown in FIG. 5 (1), the shape of the classifier casing 101B on the outer peripheral side of the fixed classifying blade 114 is a truncated conical shape whose diameter is reduced upward, and in the vertical direction. An annular gap formed between the extending rotary classifying blade 113 and the classifier casing 101 is configured to become smaller from the lower side toward the upper side.

For example, when considering the gas flow when the top of the vertical crusher 101 is configured with a horizontal ceiling, the gas flow that collides with the ceiling becomes turbulent and rises from the lower side. The gas flow may be affected.
In contrast, with the configuration shown in FIG. 5A, the gas stream can smoothly rise along the classifier casing 101B and flow into the rotary classifying blade 113 side. As a result, the possibility of affecting the gas flow rising from the lower side is reduced. Therefore, the gas flow smoothly flows, and the pressure loss when the gas flow rises in the machine is reduced, so that efficient classification is possible.

  However, when the shape of the classifier casing 101B is a truncated conical shape whose diameter is reduced upward, there is a tendency that the higher the rotational classifying blade 113 is, the faster the velocity in the center direction of the gas is. In other words, a state occurs in which the gas velocity in the center direction is different between the upper and lower sides of the rotary classification blade 113.

FIG. 7 (1) and FIG. 7 (2) show the relationship between the direction of the gas flow in the classification mechanism 115 and the theoretical classification point d. Although details will be described later, the theoretical classification point d is the center direction speed Vg when the speed at which the gas stream flows toward the center in the machine is the center direction speed Vg (m / s) of the gas stream. Proportional to ^0.5 .

That is, when the state where the central direction speed Vg is different between the upper and lower sides of the rotary classifying blade 113, the theoretical classification point d is different between the upper and lower sides of the rotary classifying blade 113.
The classification mechanism 115 of the type shown in FIG. 5 (1) is a classification mechanism with excellent classification efficiency, but in recent years, further improvement in classification efficiency has been demanded, and the theoretical classification point is above and below the rotary classification blade. In order to solve the above-described problem of being in a different state, there has been a demand for the development of a vertical crusher equipped with a classification mechanism that solves the problem.

  The present invention has been made in view of the problems as described above, and includes a classifying mechanism that is suitable when the classifier casing has a truncated cone shape whose diameter is reduced from below to above. It relates to the technology of vertical crushers.

In order to achieve the above object, a vertical crusher according to the present invention comprises:
(1) A classification mechanism provided with a pulverizing roller and a rotary table, and pulverizing the raw material charged on the rotary table with a pulverizing roller and blowing it up with a gas supplied from below the rotary table, and arranging it above the rotary table. In the vertical crusher that takes out together with gas from the upper outlet, a fixed classifying blade in which a plurality of plates extending in the vertical direction are arranged in a ring at intervals, and a vertical direction on the inner peripheral side of the fixed classifying blade A classifying mechanism including a rotary classifying blade arranged in a ring with a plurality of plates extending in a ring at intervals, and provided so that the rotary classifying blade can freely rotate an annular swirling trajectory; The classifier casing on the outer peripheral side of the fixed classifying blade has a truncated conical shape whose diameter is reduced upward, and a straight line extending from the rotation center axis of the rotating classifying blade and rotation For the inclination angle formed by the straight line extending in the width direction of the rotary classifier blade, the rotary classifier blade is divided into upper and lower parts, and the upper part of the rotary classifier blade turns the lower class part from the lower part. It formed so that it might incline largely toward the rotation direction side of a rotary classification blade toward the inner peripheral side from the outer peripheral side of a track.

(2) In the vertical crusher according to (1), the rotary classifying blade is divided into three equal parts in the vertical direction, and the angles are set to 0 degrees, 15 degrees, 30 in order from the lower side to the upper side. Formed as a degree.

(3) In the vertical crusher according to (1), the rotary classifying blades are equally divided into four in the vertical direction, and the angles thereof are 0 degree, 10 degrees, 20 in order from the lower side to the upper side. It was formed as 30 degrees.

In the present invention, the rotary classification blade is divided into a plurality of parts in the vertical direction, and the rotation angle of the rotary classification blade is rotated from the outer peripheral side to the inner peripheral side of the swirling orbit of the rotary classification blade. Inclined toward the rotation direction of the classification blade.
Then, the inclination angle is made different between the upper and lower portions of the rotary classifying blade, so that the upper portion has a larger inclination angle than the lower portion of the rotary classifying blade.

  With the above-described configuration, the present invention can mitigate the influence of the gas flow velocity due to the reduced diameter of the classifier casing by the strength of the swirling flow due to the inclination angle of the rotary classifying blade. Uniform classification is possible in the direction.

It is a figure explaining the whole structure of a vertical grinder concerning embodiment of this invention. It is a figure explaining the structure and arrangement | positioning of a classification mechanism in connection with embodiment of this invention. It is a figure explaining the inclination-angle of a rotary classification blade in connection with embodiment of this invention. It is a figure explaining the inclination-angle of a rotary classification blade in connection with other embodiment by this invention. It is a reference figure explaining the casing shape and classification blade arrangement of a vertical crusher. It is a reference figure explaining the direction of the air current by the inclination of a rotary classification blade. It is a reference figure explaining a theoretical classification point.

Hereinafter, an example of a preferred embodiment of the present invention will be described in detail with reference to the drawings.
1 to 4 relate to an embodiment of the present invention and show a preferable example thereof.
FIG. 1 is a diagram illustrating the overall configuration of a vertical crusher. 2A and 2B are diagrams for explaining the configuration and arrangement of the classification mechanism. FIG. 2A is a conceptual diagram observed from the side surface, and FIG. 2B is a diagram observed from the AA cross-sectional direction of FIG. FIG. 3 is a conceptual diagram for explaining the configuration and arrangement of the rotary classifying blade. (2) is a view observed from the AA cross-section direction of (1), and (3) is a BB view of (1). It is the figure observed from the cross-sectional direction.

  FIG. 4 is a diagram for explaining the configuration and arrangement of a rotary classifying blade according to another embodiment, (2) is a view observed from the AA cross-section direction of (1), and (3) is (1). It is the figure observed from the BB cross-section direction of (4), (4) is the figure observed from the CC cross-section direction of (1).

  FIG. 5 is a diagram for reference in understanding the present invention. FIG. 5 is a diagram for explaining the casing shape and classification blade arrangement of the vertical crusher. (1) is a conceptual diagram observed from the side. (2) is a view observed from the AA cross-section direction of (1). FIG. 6 is a reference diagram for explaining the direction of airflow due to the inclination of the rotary classifying blade, and FIG. 7 is a diagram for explaining the theoretical classification point.

Hereinafter, an example of a preferable configuration of the vertical crusher 1 according to the present embodiment will be described.
A vertical crusher 1 according to the present embodiment is installed at a lower part of a classifier casing 1B, a mill casing 1A, and a vertical crusher 1 that form an outline of the vertical crusher 1, as shown in FIG. The rotary table 2 is driven by a reduction gear 2B, a drive motor (not shown), and a conical crushing roller 3. A vertical crusher 1 shown in FIG. 1 is a vertical crusher 1 of a type generally called a center chute type, and vertically downward from the upper part of the vertical crusher 1 toward the center of the rotary table 2. A raw material supply chute 35 is provided.

  The vertical crusher 1 shown in FIG. 1 is provided with an inverter power source (not shown) as a driving power source for the rotary table 2, and is a variable speed type capable of arbitrarily changing the rotational speed of the rotary table 2 during operation. A vertical crusher 1.

The vertical crusher 1 shown in FIG. 1 is a top-down type equipped with a classification mechanism 15 inside. Above the turntable 2, an internal cone 19 having a substantially inverted conical shape is provided, and a fixed classification blade 14, which is a fixed primary classification blade, is disposed on the upper portion of the internal cone 19. A rotary classification blade 13 is disposed above the internal cone 19 and inside the fixed classification blade 14.

In the present embodiment, the rotary cylinder 18 is arranged outside the raw material supply chute 35 in a form in which the raw material supply chute 35 is inserted. A classifier motor 20 is disposed on the top of the vertical crusher 1, and the rotary cylinder 18 and the classifier motor 20 are connected by a belt. According to this embodiment, when the classifier motor 20 is rotated by the above-described configuration, the rotary cylinder 18 connected by the belt rotates.

And in this embodiment, as shown in FIG. 1, the rotary classification blade | wing 13 is attached with respect to the supporting member extended radially from the rotary cylinder 18. As shown in FIG. Therefore, by driving the classification motor 20, the rotary classification blade 13 is configured to freely rotate through the rotary cylinder 18. In the present specification, the rotary classification blade 13 and the fixed classification blade 14 are collectively referred to as a classification mechanism 15.

  Further, in the present embodiment, as shown in FIG. 2 (1), an annular gap L1 formed between the fixed classifier blade 14 and the classifier casing 1B is reduced from below to above. The shape of the classifier casing 1B on the outer peripheral side of the fixed classifying blade 14 is a truncated cone shape whose diameter is reduced upward. The classifier casing 1B on the outer peripheral side of the fixed classifying blade 14 has a truncated conical shape with a diameter decreasing upward, so that the rotary classifying blade 13 inside the fixed classifying blade 14 and The annular gap formed between the classifier casings also decreases from below to above.

  Below the rotary table 2 of the vertical crusher 1, a gas inlet 33 for introducing gas and a discharge chute 34 (sometimes referred to as a lower outlet 34) for taking out a heavy material are provided. ing. Further, as described above, a raw material supply chute 35 for feeding the raw material into the machine is disposed above the turntable 2, and an upper portion for taking out a product (a raw material having a desired particle diameter after being pulverized) together with the gas. An outlet 39 is provided.

  The inner peripheral surface of the mill casing 1 </ b> A located at a position facing the outer peripheral portion of the rotary table 2 is cylindrical, and is annular between the outer peripheral portion of the rotary table 2 and the mill casing 1 </ b> A of the vertical crusher 1. A gap 30 (annular gap 30) is formed. Further, four crushing rollers 3 are arranged on the outer peripheral portion of the rotary table 2 so that the phase is shifted by 90 degrees.

Hereinafter, the configuration and arrangement of the fixed classification blade 14 and the rotary classification blade 13 will be described.
As shown in FIGS. 2 (1) and (2), the fixed classifying blade 14 has a configuration in which a plurality of plates extending in the vertical direction are arranged in a ring at intervals. The upper end of the fixed classifier blade 14 and the classifier casing 1B are closed, and the gas flow rising along the classifier casing 1B is between the fixed classifier blades 14 arranged in a plurality. A shortcut is made without passing through the gap to prevent entry into the upper take-out port 39 side above the aircraft.

  In the present embodiment, as shown in FIG. 2 (2), the fixed classifying blade 14 has a width direction along a linear direction extending radially from the rotation center axis of the rotary classifying blade 13 described later. It is formed to stretch. However, the scope of application of the present invention is not limited to this, and may be appropriately tilted as necessary. For example, the rectification effect in the vertical pulverizer 1 is enhanced so that the gas flow smoothly flows in the apparatus. As with the rotary classifying blade 13, depending on the purpose and the like, it is one of preferred configurations to incline from the outer peripheral side toward the inner peripheral side toward the rotational direction side of the rotary classifying blade 13.

Next, the configuration of the rotary classification blade 13 will be described.
The rotary classifying blade 13 disposed on the inner peripheral side of the fixed classifying blade 14 has a configuration in which a plurality of plates extending in the vertical direction are arranged in a ring at intervals.
In the present embodiment, the rotary classifying blade 13 is formed by dividing a vertically extending plate into two in the vertical direction, the upper blade is the rotary classifying blade 13A, and the lower blade is the rotary classifying blade. It was set as the blade 13B.

  As described above, the rotary classifying blades 13A and 13B constituting the rotary classifying blade 13 are driven by the classifier motor 20 via the rotary cylinder 18 and the like, so that the circular orbit formed can freely move. Rotate.

  Here, the inclination angle α formed by the straight line extending from the rotation center axis of the rotary classifying blade 13 and the straight line extending in the width direction of the rotary classifying blade 13 will be described. From the rotary classifying blade 13B in the lower part by inclining the rotary classifying blade 13 in the direction of rotation of the rotary classifying blade 13 toward the inner peripheral side, and by varying the inclination angle at the upper and lower parts of the rotary classifying blade 13 The inclination angle of the rotary classification blade 13A in the upper part is formed large. FIG. 2 (2) shows the rotation direction of the rotary classification blade 13A (13B).

  In this embodiment, as shown in FIGS. 3 (1) to (3), the inclination angle α1 of the rotary classification blade 13A is set to the inclination angle α2 of the rotary classification blade 13B in the lower portion, and An inclination angle of a certain rotary classification blade 13A is formed larger than that of the rotary classification blade 13B in the lower part, and α1> α2. As will be described later, in the embodiment shown in FIG. 3, α1 is 30 degrees and α2 is 0 degrees.

  In the present embodiment, as shown in FIG. 3, the rotary classification blade 13 has a shape whose width direction extends linearly. However, for the purpose of increasing the rigidity of the rotary classifying blade 13, as shown in FIG. 5 (2), for example, it is preferable to bend partly into an L shape or the like, in which case the inclination angle α is The long part in the width direction may be set as a reference.

  When the rotary classifying blade 13 is slightly bent as a whole for the purpose of increasing the rigidity of the rotary classifying blade 13, the inclination angle α may be set with reference to a straight line connecting both ends in the width direction.

Hereinafter, the crushing behavior of the vertical crusher 1 will be briefly described.
As described above, the vertical crusher 1 shown in FIG. 1 has the crushing roller 3 disposed on the rotary table 2, and each crushing roller 3 is configured to be pressed in the direction of the rotary table 2. ing. Then, the crushing roller 3 is driven to rotate via the raw material with respect to the rotary table 2 as the rotary table 2 rotates.

The raw material (the blast furnace slag in this embodiment) charged from the raw material supply chute 35 of the vertical crusher 1 is charged near the center of the rotary table 2 and draws a spiral trajectory. Move to the outer periphery. Then, the raw material moved to the outer peripheral side of the rotary table 2 is caught by the crushing roller 3 and crushed.

The raw material that is crushed by being squeezed between the rotary table 2 and the pulverizing roller 3 passes over the dam ring 5 that is provided around the outer edge of the rotary table 2 and between the outer peripheral part of the rotary table 2 and the mill casing 1A. It moves to the region of the formed annular gap 30. And the raw material which moved to the annular gap 30 is blown up by the gas and rises in the casing. At this time, the flow of gas blown up is affected by the rotation of the rotary classification blade 13 and becomes a swirling flow.

The raw material blown up in the swirling gas flows while swirling in the direction of the classification mechanism 15 disposed above the turntable 2. The raw material having a small diameter that has passed through the classification mechanism 15 is taken out as a product from the upper outlet 39.

Most of the raw materials that could not pass through the classification mechanism 15 fall inside the machine and are returned to the rotary table 2 and pulverized, or collected by the internal cone 19 and supplied again to the rotary table 2. And then crushed. On the other hand, an extremely heavy raw material is not blown up by the gas and falls downward of the turntable 2. The raw material dropped below the rotary table 2 reaches the bottom surface of the vertical crusher 1 and is taken out from the discharge chute 34 by a scraper (not shown) or the like.

Hereinafter, the function and effect of the classification mechanism 15 according to the present embodiment will be described.
The classifier performs a classification operation in which a group of particles having a particle size distribution is classified and sorted into a fine powder (product) and a coarse powder with a certain particle diameter as a boundary. The particle diameter serving as the boundary is generally called a theoretical classification point.

FIGS. 5 and 7 are diagrams for explaining the classification function of the vertical crusher 1. FIG.
The theoretical classification point is expressed as Equation 1 below by arranging the equation of motion of the particles by the center direction velocity Vg between the blades and the turning direction velocity Vθ.

  d is the theoretical classification point (μm), Vθ is the velocity in the swirl direction of the airflow (m / s), and Vg (m / s) is the velocity in the airflow center direction.

  As described above, when the shape of the classifier casing 1B is a truncated conical shape whose diameter is reduced upward, the gas stream flows along the shape of the classifier casing 1B. There is a tendency that the gas velocity Vg in the center direction becomes faster as it goes above the blade 13.

FIG. 6 (1) conceptually shows the direction of airflow by the rotary classifying blade 113 according to the prior art example. As the rotary classifying blade 113 rotates, the swirl direction velocity Vθ of the airflow increases.
However, when the rotary classifying blades 113 are the same up and down, the same turning direction speed Vθ is obtained between the upper and lower parts of the rotary classifying blades 113. Therefore, if the center direction speed Vg is different in the vertical direction of the rotary classifying blade 113, the theoretical classification point d may be different, which may be an obstacle to improving the classification efficiency.

  In the present embodiment, the rotary classification blade 13 is divided into two in the vertical direction, and the inclination angle α is made different between the upper and lower portions of the rotary classification blade 13 to incline the rotary classification blade 13B. The inclination angle α1 of the rotary classifying blade 13A is formed larger than the angle α2.

  Considering from Equation 1 above, when the center direction velocity Vg in the numerator is large, the turning direction velocity Vθ in the denominator is increased, and when the center direction velocity Vg in the numerator is small, the turning direction velocity in the denominator. It is assumed that it is preferable to reduce Vθ.

  However, as a result of diligent research, the present applicant has newly generated an airflow in the apparatus that opposes the flow of the gas flowing up along the classifier casing 1B, so that the upper and lower portions of the rotary classifying blade 13 It has been found that the difference between different theoretical classification points d can be relaxed.

That is, in this embodiment, the direction of the airflow is changed by making the inclination angle α of the rotary classification blade 13A or the rotary classification blade 13B different above and below the rotary classification blade 13.
When the rotary classifying blade 13 is tilted at the tilt angle α, the swirl direction velocity Vθ of the gas stream changes as shown in FIG. 6 (2), and at the same time, the flow of gas from the inner periphery side to the outer periphery side of the swirl track is changed. This occurs as an anti-center direction velocity Vg2.

  And the flow of the airflow which is going from the inner peripheral side to the outer peripheral side of the turning track of the rotary classifying blade 13 is opposed to the flow of the airflow rising along the classifier casing 1B, and the anti-central direction speed Vg2 Decreases the central speed Vg. As a result, the difference in the theoretical classification point d that is different between the upper and lower portions of the rotary classification blade 13 can be reduced.

  When the inclination angle α is described, the maximum is 45 degrees. If it is larger than that, the effect of strengthening the swirling flow is weakened.

  As a result of the analysis of the theoretical classification point d by the computer, the entire length of the rotary classifying blade 13 is made substantially the same as the fixed classifying blade 14 on the basis of the length of the fixed classifying blade 14, and the classifier casing Assuming a case where the diameter is reduced in a state where 1B is tilted by about 10 to 15 degrees (about 13 degrees in the present embodiment) from the vertical direction, the inclination angle α of the upper end portion of the rotary classifying blade 13 is It was judged that 30 degrees was preferable. Therefore, in the present embodiment, the rotary classifying blade 13 is equally divided into two in the vertical direction, the tilt angle α1 of the rotary classifying blade 13A is set to 30 degrees, and the tilt angle α2 of the rotary classifying blade 13B is set to 0 degrees.

  In addition, from the viewpoint of alleviating the difference in the theoretical classification point d, a configuration in which the rotary classification blade 13 is equally divided into three as shown in FIG. 4 is preferable. The difference from the above-described embodiment is that the rotary classifying blade 16 is equally divided into three in the vertical direction, and the angles are sequentially increased from the lower side to the upper side, α3 is 0 degree, α2 is 15 degrees, and α1 is 30. It is a point formed as a degree.

  Further, when the rotary classifying blade 13 is equally divided into four in the vertical direction, the angles are formed as 0 degrees, 10 degrees, 20 degrees, and 30 degrees in order from the lower side to the upper side. Is preferred.

  As described above, the technique according to the present invention is useful for improving the crushing efficiency of a vertical crusher having a classifier casing having a truncated cone shape whose diameter is reduced upward and can be suitably used.

DESCRIPTION OF SYMBOLS 1 Vertical crusher 1A Mill casing 1B Classifier casing 2 Rotary table 2B Reduction gear 3 Crushing roller 5 Dam ring 13 Rotary classification blade 13A Rotary classification blade (upper part)
13B Rotary classification blade (bottom)
14 Fixed classification blade 15 Classification mechanism 16A Rotary classification blade (upper part)
16B Rotary classifying blade (middle)
16C Rotary classification blade (bottom)
19 Internal cone 20 Classifier motor 30 Annular gap 33 Gas inlet
34 Discharge chute 35 Raw material supply chute 39 Upper outlet

Claims (3)

A crushing roller and a rotary table are provided, and the raw material put on the rotary table is pulverized by the crushing roller, and blown up by the gas supplied from below the rotary table, and the upper part through a classification mechanism arranged above the rotary table. In a vertical crusher that takes out gas from the outlet,
Fixed classifying blades arranged in a ring with a plurality of plates extending in the vertical direction spaced apart and a plurality of plates extending in the vertical direction on the inner circumference side of the fixed classifying blades arranged in a ring with intervals between them The classifying mechanism with the rotary classifying blade is arranged so that the rotary classifying blade can freely rotate on the circular swirling track, and the shape of the classifier casing on the outer peripheral side of the fixed classifying blade is A truncated cone shape with a diameter decreasing upward,
In addition, the rotary classifying blades are formed by dividing the rotary classifying blades in the vertical direction with respect to the inclination angle formed by the straight line extending from the rotation center axis of the rotary classifying blades and the straight line extending in the width direction of the rotary classifying blades. A saddle type characterized in that the upper part of the blade is formed so as to be greatly inclined from the lower part to the rotation direction side of the rotary classifying blade from the outer peripheral side to the inner peripheral side of the swirling orbit of the rotary classifying blade. Crusher.   2. The rotary classification blade according to claim 1, wherein the rotary classification blades are equally divided into three in the vertical direction, and the angles are formed as 0 degrees, 15 degrees, and 30 degrees in order from the lower side to the upper side. Vertical crusher.   2. The rotary classifying blade is divided into four equal parts in the vertical direction, and the angles are formed as 0 degrees, 10 degrees, 20 degrees, and 30 degrees in order from the lower side to the upper side. The vertical crusher described in 1.

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