JP6790501B2 - Vertical crusher - Google Patents

Description

The present invention mainly relates to a vertical crusher for pulverizing cement raw materials, clinker, limestone, coal, biomass, and other inorganic raw materials, and particularly relates to a suitable vertical crusher for finely pulverizing raw materials.

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

The basic crushing behavior of the vertical crusher will be briefly described.
In the vertical crusher, a crushing roller is arranged on a rotary table, and the crushing roller is configured to be pressed in the direction of the rotary table. As the rotary table rotates, the crushing roller is driven by the rotary table via the raw material and rotates.

The raw material charged into the vertical crusher is charged onto the rotary table via a chute or the like for charging the raw material, is bitten by a crushing roller, and is crushed. The raw material bitten by the rotary table and the crushing roller and crushed goes to the annular gap between the outer peripheral portion of the rotary table and the casing.

There are various types of vertical crushers, but in the case of a top-pull type (sometimes called an airsept type) type vertical crusher that excels in finely crushing raw materials and taking them out, a rotary table Gas is introduced from below, and an air flow of gas flowing from below to above is generated in the cabin. Most of the raw materials that have flowed into the above-mentioned annular gap are blown up by the gas flow and head toward the upper part of the cabin. Then, the raw material having a desired size is taken out together with the gas from the upper outlet arranged above the rotary table.

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

Here, conventionally, a vertical crusher in which a classification mechanism is provided in the upper part of the machine is often used for the purpose of improving the classification efficiency. There are various methods of the classification mechanism. As a typical classification mechanism, for example, a type in which fixed classification blades are arranged in the machine to rectify the air flow of gas flowing in the machine to improve the classification efficiency, and a type in which rotary classification blades are arranged to flow in the machine. A type that improves the classification efficiency by strongly swirling the airflow of the gas, and a type that has both a fixed type classification blade and a rotary type classification blade to improve the classification efficiency are generally well known.

In recent years, when finely pulverizing raw materials, there are many opportunities to use a type of vertical crusher equipped with both fixed and rotary classification blades as a type of vertical crusher with excellent classification ability. It has become to. In the vertical crusher of the type equipped with both the fixed type and the rotary type described above, a fixed type classification blade (sometimes called a guide vane) for rectification is arranged on the outer peripheral side of the rotary classification blade. It is common to use a classification mechanism. Patent Document 1 shows an example of a vertical crusher provided with a classification mechanism in which a fixed classification blade for rectification is arranged on the outer peripheral side of a rotary classification blade.

Japanese Unexamined Patent Publication No. 2006-110521

Here, there is a case where the classifier casing 101B having the shape shown in FIG. 5 (1) is adopted for the purpose of smoothly flowing the gas flow inside the vertical crusher.
The classifier casing 101B shown in FIG. 5 (1) has a truncated conical shape in which the shape of the classifier casing 101B on the outer peripheral side of the fixed classifier blade 114 is reduced in diameter upward, and is in the vertical direction. The annular gap formed between the extending rotary classifying blade 113 and the classifying machine casing 101 is configured to decrease from the bottom to the top.

For example, considering the gas airflow when the upper part of the vertical crusher 101 is composed of a horizontal ceiling, the gas airflow that collides with the ceiling becomes a turbulent flow and newly rises from the lower side. It may affect the gas flow.
In comparison, with the configuration shown in FIG. 5 (1), the gas airflow can smoothly rise along the classifying machine casing 101B and flow into the rotary classifying blade 113 side. As a result, the possibility of affecting the air flow of the gas rising from the lower side is reduced. Therefore, the gas airflow flows smoothly, and the pressure loss when the gas airflow rises in the machine is also small, so that efficient classification is possible.

However, when the shape of the classifier casing 101B is a truncated cone shape whose diameter is reduced upward, there is a tendency that the velocity in the central direction of the gas becomes faster toward the upper side of the rotary classifier blade 113. In other words, a state occurs in which the velocity in the central direction of the gas differs between the upper and lower parts of the rotary classification blade 113.

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

That is, when a state occurs in which the velocity Vg in the central direction differs between the upper and lower parts of the rotary classification blade 113, the theoretical classification point d becomes different between the upper and lower parts of the rotary classification blade 113.
The classification mechanism 115 of the type shown in FIG. 5 (1) is a classification mechanism having excellent classification efficiency, but in recent years, further improvement in classification efficiency has been required, and the theoretical classification points are above and below the rotary classification blade. In order to solve the above-mentioned problem of being in a different state, it has been required to develop a vertical crusher equipped with a classification mechanism that solves the problem.

The present invention has been made in view of the problems described above, and is provided with a classification mechanism suitable for the case where the shape of the classifier casing is a truncated conical shape in which the diameter is reduced from the lower side to the upper side. Regarding the technology of vertical crushers.

In order to achieve the above object, the vertical crusher according to the present invention
(1) A classification mechanism equipped with a crushing roller and a rotary table, in which the raw materials put on the rotary table are crushed by the crushing roller and blown up by the gas supplied from below the rotary table and arranged above the rotary table. It is a vertical crusher that takes out with gas from the upper outlet through .
A fixed classification blade in which a plurality of vertically extending plates are arranged in a ring shape at intervals and a plurality of plates extending in a vertical direction on the inner peripheral side of the fixed classification blade are arranged in a ring shape at an interval. A classification mechanism equipped with a rotary classifying blade is provided so that the rotary classifying blade can freely rotate an annular swivel trajectory, and the shape of the classifying machine casing on the outer peripheral side of the fixed classifying blade is formed. It has a truncated conical shape that shrinks upward at a constant angle in the range of 10 to 15 degrees .
Further, the rotary classification blade is formed by dividing the rotary classification blade into three evenly in the vertical direction with respect to the inclination angle formed by the straight line extending from the rotation center axis of the rotary classification blade and the straight line extending in the width direction of the rotary classification blade. The upper part of the rotary classification blade is formed so as to be greatly inclined from the lower part toward the rotation direction side of the rotary classification blade from the outer peripheral side to the inner peripheral side of the swirling trajectory of the rotary classification blade, and the lowermost stage. the angle of the rotary classifier vanes as 0 degree, up to the rotary classifier vanes at the uppermost stage, in order 0 degrees toward the angle from the lower side to the upper side, 15 degrees, forming a 30-degree, increasing the angle at a constant rate ..

(2) A classification mechanism equipped with a crushing roller and a rotary table, in which the raw materials put on the rotary table are crushed by the crushing roller and blown up by the gas supplied from below the rotary table and arranged above the rotary table. It is a vertical crusher that takes out gas together with gas from the upper outlet through the fixed type classification blades, in which a plurality of vertically extending plates are arranged in a ring shape at intervals, and on the inner peripheral side of the fixed type classification blades. A classification mechanism including a rotary classification blade in which a plurality of vertically extending plates are arranged in an annular shape at intervals is arranged so that the rotary classification blade can freely rotate an annular turning trajectory. At the same time, the shape of the classifier casing on the outer peripheral side of the fixed classifying blade is made into a truncated conical shape that shrinks upward at a constant angle in the range of 10 to 15 degrees, and the rotation center of the rotary classifying blade. Regarding the inclination angle formed by the straight line extending from the shaft and the straight line extending in the width direction of the rotary classification blade, the rotary classification blade is formed by dividing the rotary classification blade into four evenly in the vertical direction, and the upper part of the rotary classification blade is below. From the side part, the rotary classification blade is formed so as to be greatly inclined from the outer peripheral side to the inner peripheral side of the swivel trajectory of the rotary classification blade toward the rotation direction side of the rotary classification blade, and the angle of the lowermost rotary classification blade is set to 0 degree. Then, the angle is formed as 0 degree, 10 degree, 20 degree, and 30 degree from the lower side to the upper side in order up to the uppermost rotary classifying blade, and the angle is increased at a constant rate.

In the present invention, a plurality of rotary classification blades are formed by dividing them in the vertical direction, and the inclination angle of the rotary classification blades is rotary from the outer peripheral side to the inner peripheral side of the swirling trajectory of the rotary classification blades. Tilt the classification blade toward the rotation direction.
Then, the inclination angles of the upper and lower portions of the rotary classification blade are made different, so that the inclination angle of the upper portion is formed larger than that of the lower portion of the rotary classification blade.

According to the above-described configuration, the influence of the gas airflow velocity due to the diameter reduction of the classifier casing can be mitigated by the strength of the swirling flow due to the inclination angle of the rotary classifier blades. Uniform classification is possible in the direction.

It is a figure explaining the whole structure of the vertical crusher which concerns on embodiment of this invention. It is a figure explaining the structure and arrangement of the classification mechanism which concerns on embodiment of this invention. It is a figure explaining the inclination angle of the rotary classification vane which concerns on embodiment of this invention. It is a figure explaining the inclination angle of the rotary classification vane with respect to another embodiment by this invention. It is a reference figure explaining the casing shape and the classification blade arrangement of a vertical crusher. It is a reference figure explaining the direction of the air flow by the inclination of a rotary classification vane. 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 and the like.
1 to 4 relate to an embodiment of the present invention and show preferred examples thereof.
FIG. 1 is a diagram illustrating an overall configuration of a vertical crusher. FIG. 2 is a diagram for explaining the configuration and arrangement of the classification mechanism, (1) is a conceptual diagram observed from the side surface, and (2) is a diagram observed from the AA cross-sectional direction of (1). FIG. 3 is a conceptual diagram for explaining the configuration and arrangement of the rotary classification blades, (2) is a view observed from the AA cross-sectional direction of (1), and (3) is BB of (1). It is a figure observed from the cross-sectional direction.

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

It should be noted that FIG. 5 is a diagram which is a reference for understanding the present invention, FIG. 5 is a diagram for explaining the casing shape and the classification blade arrangement of the vertical crusher, and FIG. 5 is a conceptual diagram observed from the side surface. (2) is a view observed from the AA cross-sectional direction of (1). Further, FIG. 6 is a reference diagram for explaining the direction of the air flow due to the inclination of the rotary classification 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.
As shown in FIG. 1, the vertical crusher 1 according to the present embodiment is installed in the classifier casing 1B and the mill casing 1A forming the outer shell of the vertical crusher 1, and the lower part of the vertical crusher 1. It includes a speed reducer 2B, a rotary table 2 driven by a drive motor (not shown), and a conical crushing roller 3. Further, the vertical crusher 1 shown in FIG. 1 is a vertical crusher 1 of a type generally called a center chute method, and is vertically downward from the upper part of the vertical crusher 1 toward the center of the rotary table 2. It is equipped with a raw material supply chute 35 that extends to.

The vertical crusher 1 shown in FIG. 1 is provided with an inverter power supply (not shown) as a power source for driving the rotary table 2, and is a variable speed type in which the rotation speed of the rotary table 2 can be arbitrarily changed during operation. It is a vertical crusher 1.

The vertical crusher 1 shown in FIG. 1 is a top-pulling type having a classification mechanism 15 inside. An internal cone 19 having a substantially inverted conical shape is provided above the rotary table 2, and a fixed classification blade 14 which is a fixed primary classification blade is arranged above the internal cone 19. A rotary classification blade 13 is arranged above the inner cone 19 and inside the fixed classification blade 14.

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

Then, as shown in FIG. 1, in the present embodiment, the rotary classification blade 13 is attached to the support member radially extending from the rotary cylinder 18. Therefore, by driving the classification motor 20, the rotary classification blade 13 is configured to rotate freely via 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), the annular gap L1 formed between the fixed classifying blade 14 and the classifying machine casing 1B becomes smaller from the lower side to the upper side. The shape of the classifier casing 1B on the outer peripheral side of the fixed classifying blade 14 is a truncated conical shape in which the diameter is reduced upward. The shape of the classifier casing 1B on the outer peripheral side of the fixed classifying blade 14 is changed to a truncated conical shape in which the diameter is reduced upward, so that the rotary classifying blade 13 inside the fixed classifying blade 14 is formed. The annular gap formed between the classifier casings also decreases from the bottom to the top.

Below the rotary table 2 of the vertical crusher 1, a gas introduction port 33 for introducing gas and an discharge chute 34 (sometimes referred to as a lower outlet 34) for taking out a heavy raw material are provided. ing. Further, above the rotary table 2, as described above, a raw material supply chute 35 for putting raw materials into the machine is arranged, and an upper part for taking out a product (a raw material crushed to a desired particle size) together with gas. It is provided with an outlet 39.

The inner peripheral surface of the mill casing 1A located at a position facing the outer peripheral portion of the rotary table 2 has a cylindrical shape, and is annular between the outer peripheral portion of the rotary table 2 and the mill casing 1A 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 with their phases shifted by 90 degrees.

Hereinafter, the configurations and arrangements of the fixed classification blade 14 and the rotary classification blade 13 will be described.
As shown in FIGS. 2 (1) and 2 (2), the fixed classifying blade 14 has a configuration in which a plurality of vertically extending plates are arranged in an annular shape at intervals. Then, the upper end of the fixed classifying blade 14 and the classifying machine casing 1B are closed, and the air flow of the gas rising along the classifying machine casing 1B is between the fixed classifying blades 14 in which a plurality of sheets are arranged. Shortcuts are made without passing through the gap to prevent the aircraft from entering the upper outlet 39 side above the aircraft.

In the present embodiment, as shown in FIG. 2 (2) and the like, the width direction of the fixed classification blade 14 is along a linear direction extending radially from the rotation center axis of the rotary classification blade 13 described later. It is formed to stretch. However, the scope of application of the present invention is not limited to this, and it may be inclined as needed. For example, the rectifying effect in the vertical crusher 1 is enhanced to allow the gas flow to flow smoothly in the machine. It is one of the preferable configurations that the rotary classification blade 13 is inclined from the outer peripheral side toward the inner peripheral side toward the rotation direction side of the rotary classification blade 13 depending on the purpose or the like.

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

As described above, the rotary classifying blades 13A and 13B constituting the rotary classifying blade 13 are driven by the classifying machine motor 20 via the rotary cylinder 18 and the like to freely move the swirling trajectory formed in an annular shape. Rotate.

Here, if the inclination angle α formed by the straight line extending from the rotation central axis of the rotary classification blade 13 and the straight line extending in the width direction of the rotary classification blade 13 is described, the outer peripheral side of the swirling trajectory of the rotary classification blade 13 will be described. In addition to inclining the rotary classification blade 13 toward the inner peripheral side in the rotation direction side, the above-mentioned inclination angle is made different between the upper and lower portions of the rotary classification blade 13 from the rotary classification blade 13B in the lower portion. The tilt angle of the rotary classification blade 13A on the upper portion is formed large. FIG. 2 (2) shows the rotation direction of the rotary classification blades 13A (13B).

In the present embodiment, as shown in FIGS. 3 (1) to 3 (3), the inclination angle α1 of the rotary classification blade 13A is set, the inclination angle α2 of the rotary classification blade 13B in the lower portion is set, and the inclination angle α2 is set in the upper portion. The inclination angle of a rotary classifying blade 13A was formed to be larger than that of the rotary classifying blade 13B in the lower portion, 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, the rotary classification blade 13 has a shape in which the width direction extends linearly, as shown in FIG. However, for the purpose of increasing the rigidity of the rotary classification blade 13, for example, as shown in FIG. 5 (2), it is preferable to bend a part of the rotary classifying blade 13 to form an L shape or the like, and the inclination angle α in that case is , The part long in the width direction may be set as a reference.

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

Hereinafter, the crushing behavior and the like of the vertical crusher 1 will be briefly described.
As described above, in the vertical crusher 1 shown in FIG. 1, crushing rollers 3 are arranged 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, as the rotary table 2 rotates, the crushing roller 3 is driven by the rotary table 2 via the raw material and rotates.

The raw material (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 locus while drawing a spiral trajectory of the rotary table 2. Move to the outer peripheral side. Then, the raw material that has moved to the outer peripheral side of the rotary table 2 is bitten by the crushing roller 3 and crushed.

The raw material bitten and crushed by the rotary table 2 and the crushing roller 3 gets over the dam ring 5 provided around the outer edge of the rotary table 2 and is between the outer peripheral portion of the rotary table 2 and the mill casing 1A. It moves to the region of the formed annular gap 30. Then, the raw material that has moved to the annular gap 30 is blown up by the gas and rises in the casing. The flow of gas blown up at this time is affected by the rotation of the rotary classification blade 13 and becomes a swirling flow.

The raw material blown up by being accompanied by the gas that has become a swirling flow flows while swirling toward the classification mechanism 15 arranged above the rotary table 2. Then, 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 in the machine and are returned to the rotary table 2 and crushed, or are collected in the internal cone 19 and supplied to the rotary table 2 again. And crushed. On the other hand, among the raw materials, those having an extremely large weight are not blown up by the gas and fall toward the lower side of the rotary table 2. The raw material that has fallen below the rotary table 2 reaches the bottom surface of the vertical crusher 1 and is taken out of the machine from the discharge chute 34 by a scraper or the like (not shown).

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

5 and 7 are diagrams for explaining the classification function of the vertical crusher 1.
The theoretical classification point is expressed as the following mathematical formula 1 by arranging the equation of motion of the particles by the central velocity Vg between the blades and the swirling velocity Vθ.

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

As described above, when the shape of the classifier casing 1B is a faceted conical shape whose diameter is reduced upward, the gas flow flows along the shape of the classifier casing 1B, so that the classifier is rotary classified. There is a tendency that the velocity Vg in the central direction of the gas becomes faster toward the upper side of the blade 13.

FIG. 6 (1) conceptually shows the direction of the air flow by the rotary classification blade 113 according to the example of the prior art. The rotation of the rotary classification blade 113 increases the speed Vθ in the swirling direction of the airflow.
However, when the rotary classification blades 113 are the same in the upper and lower directions, the speed Vθ in the turning direction is the same in the upper and lower directions of the rotary classification blades 113. Therefore, if the speed Vg in the central direction differs in the vertical direction of the rotary classification blade 113, the theoretical classification point d will be different, which may be an obstacle in improving the classification efficiency.

In the present embodiment, the rotary classification blade 13 is formed by dividing the rotary classification blade 13 into two in the vertical direction, and the inclination angle α is different between the upper and lower portions of the rotary classification blade 13 so that the rotary classification blade 13B is tilted. The inclination angle α1 of the rotary classification blade 13A is formed larger than the angle α2.

Considering from the above equation 1, when the central velocity Vg in the molecule is large, the turning velocity Vθ in the denominator is increased, and when the central velocity Vg in the molecule is small, the turning velocity in the denominator is increased. It is assumed that it is preferable to reduce Vθ.

However, as a result of diligent research, the applicant has created a new air flow in the machine that opposes the flow of the gas flow that rises along the classifying machine casing 1B, so that the upper and lower parts of the rotary classifying blade 13 It was found that the difference between different theoretical classification points d can be alleviated.

That is, in the present embodiment, the direction of the air flow is changed by making the inclination angle α of the rotary classification blade 13A and the rotary classification blade 13B different above and below the rotary classification blade 13.
When the rotary classification blade 13 is tilted at the tilt angle α, the swirling direction velocity Vθ of the gas flow changes as shown in FIG. 6 (2), and at the same time, the gas flow from the inner peripheral side to the outer peripheral side of the swirling trajectory changes. It occurs as an anti-central velocity Vg2.

Then, the flow of the airflow from the inner peripheral side to the outer peripheral side of the swirling orbit of the rotary classification blade 13 faces the flow of the airflow rising along the classifier casing 1B, and the velocity Vg2 in the anticenter direction is Decelerates the central velocity Vg. As a result, it is possible to alleviate the difference in the theoretical classification points d that differ between the upper and lower portions of the rotary classification blade 13.

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

As a result of analyzing the theoretical classification point d by a computer, the total length of the rotary classification blade 13 is set to substantially the same length as the fixed classification blade 14 based on the length of the fixed classification blade 14, and the classifier casing Assuming that the diameter of 1B is reduced while being tilted by about 10 to 15 degrees (about 13 degrees in this embodiment) from the vertical direction, the inclination angle α of the upper end portion of the rotary classification blade 13 is It was judged that about 30 degrees was preferable. Therefore, in the present embodiment, the rotary classification blade 13 is divided into two evenly in the vertical direction, the inclination angle α1 of the rotary classification blade 13A is set to 30 degrees, and the inclination angle α2 of the rotary classification blade 13B is set to 0 degrees.

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

Further, when the rotary classification blade 13 is evenly divided into four in the vertical direction, the angles are formed to be 0 degrees, 10 degrees, 20 degrees, and 30 degrees in order from the lower side to the upper side. Is preferable.

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

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

Claims (2)

A crushing roller and a rotary table are provided, and the raw material put on the rotary table is crushed by the crushing roller and blown up by the gas supplied from the lower part of the rotary table, and the upper part is placed via the classification mechanism arranged above the rotary table. It is a vertical crusher that takes out with gas from the outlet .
A fixed classification blade in which a plurality of vertically extending plates are arranged in a ring shape at intervals and a plurality of plates extending in a vertical direction on the inner peripheral side of the fixed classification blade are arranged in a ring shape at an interval. A classification mechanism equipped with a rotary classifying blade is provided so that the rotary classifying blade can freely rotate an annular swivel trajectory, and the shape of the classifying machine casing on the outer peripheral side of the fixed classifying blade is formed. It has a truncated conical shape that shrinks upward at a constant angle in the range of 10 to 15 degrees .
Further, the rotary classification blade is formed by dividing the rotary classification blade into three evenly in the vertical direction with respect to the inclination angle formed by the straight line extending from the rotation center axis of the rotary classification blade and the straight line extending in the width direction of the rotary classification blade. The upper part of the rotary classification blade is formed so as to be greatly inclined from the lower part toward the rotation direction side of the rotary classification blade from the outer peripheral side to the inner peripheral side of the swirling trajectory of the rotary classification blade, and the lowermost stage. the angle of the rotary classifier vanes as 0 degree, up to the rotary classifier vanes at the uppermost stage, in order 0 degrees toward the angle from the lower side to the upper side, 15 degrees, forming a 30-degree, increasing the angle at a constant rate A vertical crusher characterized by this. A crushing roller and a rotary table are provided, and the raw material put on the rotary table is crushed by the crushing roller and blown up by the gas supplied from the lower part of the rotary table, and the upper part is placed via the classification mechanism arranged above the rotary table. It is a vertical crusher that takes out with gas from the outlet.
A fixed classification blade in which a plurality of vertically extending plates are arranged in a ring shape at intervals and a plurality of plates extending in a vertical direction on the inner peripheral side of the fixed classification blade are arranged in a ring shape at an interval. A classification mechanism equipped with a rotary classifying blade is provided so that the rotary classifying blade can freely rotate an annular swivel trajectory, and the shape of the classifying machine casing on the outer peripheral side of the fixed classifying blade is formed. It has a truncated conical shape that shrinks upward at a constant angle in the range of 10 to 15 degrees.
Further, the rotary classification blade is formed by dividing the rotary classification blade into four evenly in the vertical direction with respect to the inclination angle formed by the straight line extending from the rotation center axis of the rotary classification blade and the straight line extending in the width direction of the rotary classification blade. The upper part of the rotary classification blade is formed so as to be greatly inclined from the lower part toward the rotation direction side of the rotary classification blade from the outer peripheral side to the inner peripheral side of the swirling trajectory of the rotary classification blade, and the lowermost stage. The angle of the rotary classification blade is set to 0 degrees, and the angle is formed as 0 degrees, 10 degrees, 20 degrees, and 30 degrees in order from the lower side to the upper side up to the uppermost rotary classification blade, and the angles are set at a constant ratio. Vertical crusher characterized by increasing the number of .

Images