JPH0368736B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is characterized in that powder and granules are moved up inside a casing by gas supplied from below inside the casing, and the powder and granules are classified into a classifier according to their particle size. This invention relates to a vertical mill in which powder and granules can be selectively taken out of a casing.

BACKGROUND ART FIG. 20 is a simplified cross-sectional view of a static type vertical mill 1 of the prior art. The prior art vertical mill 1 will be explained using FIG. 20. A table 2 having a vertical axis of rotation is disposed within a casing 1a of the vertical mill 1, and the table 2 is rotationally driven by a drive means 3. This table 2 includes a table liner 2a for pulverizing powder and granules.

A plurality of crushing rollers 4 are arranged on the table liner 2a in the circumferential direction thereof. The grinding roller 4 is connected to the arm 5 via a pivot 6 so as to be angularly displaceable. One end of the arm 6 is connected to a pressurizing means 7 extending outside the casing 1a. This pressurizing means 7
elastically urges the arm 5, whereby the crushing roller 4 is pressed onto the table liner 2a.

A supply pipe 8 for supplying raw materials such as powder or granules is provided on the table 2. Further, above the table 2, a classifier 9 is provided. The classifier 9 includes a substantially conical cone 10 and a classifier blade 11 . The ceiling plate 12 of the vertical mill 1 has a discharge port 13 for taking out the powder and granules to the outside of the casing 1a.
is provided. Further, below the table 2 of the casing 1a, there is provided an air outlet 14 for supplying gas for raising the granular material within the casing 1a, as will be described later.

In the vertical mill 1 having the above-described configuration, the powder and granules supplied from the supply pipe 8 fall onto the table 2 . At this time, since the table 2 is rotationally driven by the driving means 3, the powder particles enter between the table liner 2a and the crushing roller 4 due to centrifugal force. The powder and granules crushed by the table liner 2a and the crushing roller 4 are transported to the air outlet 1.
The gas from 4 rises inside the casing 1a. This powder enters the classifier 9 through the guide hole 15 between the cone 10 and the ceiling plate 12. At this time, the powder particles having a particle size larger than a predetermined size are caused to fall downward within the cone 10 by the classification blade 11, and are dropped into the cone 10.
0 and falls onto the table 2a again. Powder and granular materials having a particle size equal to or less than the predetermined particle size are stored in the air outlet 1.
The gas flow from 4 is sent out from the outlet 13 to the outside of the casing 1a. The granular material falling from the cone 10 onto the table 2 is mixed with the granular material from the supply pipe 8, and is pulverized by the table liner 2a and the pulverizing roller 4.

Although the vertical mill 1 that performs pulverization as described above has a simple configuration, it is not possible to obtain powder or granules of any desired particle size from the discharge port 13. That is, since the particle size of the granular material obtained from the discharge port 13 is set in advance by the guide vanes 11, it has become difficult to obtain granular material of an arbitrary particle size.

FIG. 21 is a simplified cross-sectional view of another prior art rotary blade type vertical mill 20, and FIG. 22 is a graph for explaining the classification function of the vertical mill 20. This prior art is similar to the prior art shown in FIG. 20, and corresponding parts are given the same reference numerals. This prior art is characterized in that a plurality of rotary vanes 21 are provided above the casing 1a in the circumferential direction, instead of providing the cone 10 and guide vanes 11 that constitute the classifier 9 in the description of the prior art in FIG. It is.

The lower end of the rotary blade 21 in FIG.

In the vertical mill 20 having the above-mentioned configuration, the granular material supplied from the supply pipe 8 ascends within the casing 1a through a process similar to that described in FIG. 20. At this time, the powder and granules are transferred to the plurality of rotary blades 21 which are rotationally driven together with the gas from the air outlet 14.
However, since the rotor blade 21 is rotationally driven as described above, powder particles larger than a predetermined particle size are subjected to a large centrifugal force and are pushed through the casing 1a. Fall downwards. On the other hand, powder with a small particle size passes through the gap between the rotary blades 21 and exits from the discharge port 13 to the casing 1a.
is discharged to the outside. On the other hand, the powder having a large particle size that has fallen below the casing 1a is crushed again on the table 2.

In the vertical mill 20 having the above configuration, the particle size of the powder obtained from the discharge port 13 can be changed by changing the rotational speed of the rotary blades 21. The operating state of the vertical mill 20 will be explained with reference to FIG. 22. When the rotary blade 21 is rotating at a certain speed, the particle size structure of the powder obtained from the discharge port 13 is shown by line 200 in FIG. 22.

Next, when the rotational speed of the rotary blade 21 is reduced, the particle size configuration of the powder and granular material obtained from the discharge port 13 changes to the second
This will be shown by line 201 in Figure 2. At this time, if the angles formed by the lines 200 and 201 in FIG. 22 with the horizontal axis are θ1 and θ2, respectively, then the tangent value N obtained from these θ1 and θ2 is expressed by the following formula.

N1=tanθ1...(1) N2=tanθ2...(2) The value N indicating the particle size structure of the powder obtained by changing the rotational speed of the rotor blade 21 as described above is the 22nd
As shown in the figure, results that satisfy the following formula are obtained.

N1=N2...(3) Therefore, by changing the rotation speed of the rotor blade 21, it is possible to obtain any predetermined particle size distribution, but in each case, the particle size range is constant.

For example, when grinding cement in the vertical mill 20, the above value N,
Therefore, it is desirable that the particle size structure of the powder or granular material as shown in FIG. 22 be made to have a wide range of particle sizes as much as possible. However, in the vertical mill 20, since the grinding time of the powder and granules is short, as mentioned above, the proportion of the circulating part of the powder and granules in the casing 1a becomes high, and therefore the above-mentioned value N becomes large. The problem is that the outlet 13
There was a problem that the particle size structure of the powder obtained from the method was extremely narrow.

Fig. 23 shows a vertical mill 3 which is a combination of the static type shown in Fig. 20 and the rotary blade type shown in Fig. 21.
0 is a simplified cross-sectional view of FIG. The vertical mill 30 is
Similar and corresponding parts to the prior art described above are given the same reference numerals. The vertical mill 30 of this prior art has a configuration in which a classifier 9 consisting of a cone 10 and a classification blade 11 as shown in FIG. 20 and a rotary blade 21 as shown in FIG. 21 are provided as a classifier in a casing 1a. It is. The raw material powder supplied from the supply port 8 rises within the casing 1a through the process described in the prior art described above. The powder and granules that have risen in this way are passed through the guide hole 15 to the classification blade 1.
1 and enters the cone 10. At this time, classification blade 1
1, powder particles having a particle size larger than a predetermined particle size are dropped below the cone 10.
The granular material that has entered the cone 10 is then moved to the driving means 2.
The powder is classified as described above by the rotary blade 21 which is rotationally driven by the rotor 3, and the classified powder is taken out of the casing 1a through the discharge port 13. The remaining part of the powder and granules are Corn 10
It falls through the inside of the table 2, falls onto the table 2 again, and is crushed.

The vertical mill 30 having such a configuration also has problems similar to those pointed out in the vertical mill 20 of FIG. 21. In other words, the particle size of the powder obtained from the discharge port 13 is narrow, and the rotor blade 2
Even if the center value of the particle size distribution of the powder or granule obtained by changing the rotation speed of 1 changes, the width of the particle size distribution of this powder or granule does not change, and a distribution with an arbitrary width cannot be obtained. This is the problem.

The problems common to the above-mentioned prior art are as follows. That is, the problem is that it is difficult to set the width of the particle size configuration of the powder or granular material obtained from the discharge port 13 to an arbitrary width depending on the use of the powder or granular material.

Problems to be Solved by the Invention The present invention aims to solve the above-mentioned problems and to provide a vertical mill that can set the width of the distribution regarding the particle size of the obtained powder to any predetermined width. purpose.

Means for Solving the Problems The present invention comprises: a casing having a ceiling plate; a crushing means comprising a table and a crushing roller provided below within the casing; A classifier includes a blowing means that generates an air current blown upward, a plurality of classification blades installed circumferentially below the ceiling plate, and a classifier provided radially outward of the classification blades to remove powder and granules from the casing. This vertical mill is characterized in that it includes a bleed means for extracting air, and a discharge means provided radially inward of each classification blade for extracting powder and granules out of the casing and communicating with the bleed means.

In a preferred embodiment, the vertical mill includes: an adjusting means for adjusting the size of a flow portion through which the powder and granules of the air extraction means flow; a collecting means for collecting the powder and granules from the discharge means; a detection means for detecting a distribution state regarding the particle size of the powder or granular material collected by the collection means and outputting a value related to this distribution state, the output value being a predetermined value. The adjustment means is activated so that the size of the flowing portion is changed by the adjustment means.

Effect According to the present invention, the crushing means for performing a crushing operation to produce powder and granules is provided below within the casing, and the classifier provided with a plurality of classification blades is provided below the ceiling plate within the casing. . Therefore, when the powder obtained by the crusher is blown upward by the air flow inside the casing, the coarse powder with large particle size falls inside the casing and reaches the classifier and ceiling board. Instead, the first classification action is performed at this stage.

After the first classification action, part of the granular material that has reached the classifier or the vicinity of the ceiling plate is classified by the classifier, and the remaining part is communicated with the air extraction means by the air extraction means. guided by means of evacuation. On the other hand, the granular material having a small particle size obtained by classification by the classifier is led to the discharge means and mixed with the granular material from the bleed means to form a product.

Therefore, it is possible to prevent the excessively sized powder and granules in the powder and granular material immediately after pulverization from being led to the discharge means via the bleed means, and the quality of the obtained product is improved. Furthermore, the movement of the powder and granules by the air extraction means to the discharge means and the classification action by the classifier are performed in parallel on the powder and granules that have reached the vicinity of the classification blade or ceiling plate, as described above. By adjusting the classification action of the classifier, the classification range regarding the particle size of the powder and granules contained in the resulting product can be set as wide as possible, for example.
Can be set to any range.

Embodiment FIG. 1 shows a vertical mill 40 according to a first embodiment of the present invention.
FIG. 2 is a plan view of the vertical mill 40, and FIG. 3 is a perspective view of a portion of the vertical mill 40. The configuration of the vertical mill 40 will be explained using FIGS. 1 to 3. Casing 41 of vertical mill 40
A table 42 having a vertical axis of rotation is disposed thereon, and is rotationally driven by a driving means 43.

This table 42 includes a table main body 42a,
and a table liner 42b fixed to the table main body 42a. On the table liner 42b,
A plurality of rotatable rollers 44 are installed at intervals in the circumferential direction. Support shaft 4 of crushing roller 44
5 is connected via an arm 46 and a pivot 47 so as to be able to change its angle. An end of the arm 46 opposite the pivot 47 is connected to a pressurizing means 48 extending outward from the casing 41 . This pressing means 48 elastically presses the arm 46, and the crushing roller 44 is pressed against the table liner 42b.

Below the table 42 of the casing 41, crushed powder and granules are placed in the casing 41 as described below.
An air outlet 49 is provided for supplying gas to be blown up and conveyed upwardly within the chamber. The gas supplied from the ventilation port 49 is blown up from below the table 42 over the entire circumference while passing through a ventilation means 50 such as a duct provided below the table 42 surrounding the table 42 .

Above the table 42 within the casing 41,
A supply pipe 51 for supplying powder or granular material as a raw material is provided to extend outward from the casing 41 . Further upwardly within the casing 41, there are provided an inverted, generally conical cone 52, and a plurality of classification blades 53 disposed in the circumferential direction near the upper end of the cone 52. The classifier 54 includes a cone 52 and a classifier blade 53. The upper end of the classification blade 53 is provided with a ceiling plate 55 against which the powder particles blown up inside the casing 41 collide, and this ceiling plate 55 forms a part of the casing 41 .

The ceiling plate 55 is provided with a discharge means 57 for taking out the granular material that has been classified by the classification blade 53 and moved into the space 56 formed by the cone 52 and the classification blade 53 to the outside of the casing 41. . Further, in the remaining part of the ceiling plate 55, there are a plurality of air extraction means 59a, 5 such as ducts that communicate the space 58 directly below the ceiling plate 55 in the casing 41 and the exhaust means 57.
9b, 59c, 59d (four in this example,
In addition, a general reference numeral 59) is provided. Further, each of the air extraction means 59 has a damper 6.
0a, 60b, 60c, and 60d (collectively referred to as 60) are provided.

The operating state of the vertical mill 40 having the above configuration and the classifier 54 will be explained. Referring to FIG. 1, raw material powder supplied from supply pipe 51 falls onto table 42. As shown in FIG. Since the table 42 is rotationally driven by the driving means 43, the powder on the table 42 is moved between the table liner 42b and the crushing roller 44 under the influence of centrifugal force, and is crushed. The pulverized powder and granules are transferred to the casing 4 by the gas flow from the ventilation port 49 and the ventilation means 50.
Rise within 1.

FIG. 4 is a graph showing the particle size structure at each stage, which will be described later, such as pulverization and sizing of powder and granular material.
The horizontal axis represents the particle size X of the powder or granular material, and the vertical axis represents the weight % of the powder or granular material having each particle size X.

The relationship between the particle size of the granular material immediately after being crushed and the ratio of the weight of the granular material having each particle size to the total powder weight is shown by the line 202 in FIG. 41.
Point P1 on the horizontal axis of FIG. 41 indicates the center value of the particle size of the powder or granular material. A portion of the granular material that has risen inside the casing 41 is conveyed by the gas flow, passes between the plurality of classification blades 53 and is swirled, and is predetermined in relation to the angle formed with the radial direction of the classification blades 53. Powder having a particle size larger than the particle size, that is, a powder having a relatively large weight, is subjected to a large centrifugal force, reaches the side wall 52a of the cone 52, and falls inside the cone 52 along the side wall 52a. do.

On the other hand, particles other than the particles falling in the space 56 are conveyed in the direction of the discharge means 57 by the gas flow. In addition, within the casing 41, the classification blade 53
A portion of the powder that is not suitable for use is guided to the discharge means 57 via the bleed means 59.

The particle size of the powder passing between the classification blades 53;
The relationship between the weight of the powder having each particle size and the proportion of the weight of the total passing powder is shown by the line 203 in FIG. 42. Point P2 on the horizontal axis is the center value of the particle size.

Comparing the line 203 in FIG. 4(2) with the line 202 in FIG.
It can be seen that portions with small particle diameters are selected from among the granular material immediately after being crushed by the crushing roller 44. Furthermore, the relationship between the particle size of the powder and granular material passing through the air extraction means 59 and the weight of the powder and granular material having each particle size is as follows.
This is indicated by line 204 in FIG. That is, the fourth
When compared with the powder and granular material heading toward the discharge means 57 after being classified by the classification blade 53 as shown by line 203 in FIG. 2, it contains a large amount of powder and granular material having a larger particle size.

Further, the powder and granules heading from the space 56 to the discharge means 57 and the powder and granules conveyed to the discharge means 57 via the air extraction means 59 are mixed inside the discharge means 57, and are taken out as a product. . The relationship between the particle size of the powder or granule that is the product thus obtained and the ratio of the weight of the powder or granule having each particle size to the total powder weight is shown by line 205 in FIG. It will be done. Point P4 on the horizontal axis is the center value of the particle size for the graph of line 205. From the graph in Figure 4,
It can be seen that the composition of the powder and granular material obtained from the discharge port 64 as described above includes powder and granular material with a wide range of particle sizes.

The line 207 in FIG.
The configuration of the powder and granular material falling within the casing 41 without moving into the space 56 is shown. Such a powder or granule has a relatively large particle size.

51 is a graph of the graph of FIG. 42, and FIG. 52 is a graph obtained by converting the coordinates of the graph of line 105 of FIG. 4, respectively, so that they can be expressed as straight lines.
In other words, the horizontal axis is the logarithm logX of the particle size X of the powder,
The vertical axis is the logarithm of the weight ratio R% with particle size X or more
(logR) is the so-called Rosin-Rammler diagram. Lines 208 and 209 in Figure 5 1 are shown in Figure 4 2.
and lines 203 and 204 in FIG. 4, respectively. The tangent values of the angles θ3 and θ4 that lines 208 and 209 make with the horizontal axis of the graph are N3 and N4, respectively, and the fourth
The value of the tangent of the angle θ5 of the line 210 in FIG. 2 is N5, and the following formula holds true.

tanθ3=N3...(4) tanθ4=N4...(5) tanθ5=N5...(6) Furthermore, the following relationship holds true between these tangent values.

N5<N3...(7) N5<N4...(8) In other words, in this example, it is possible to obtain powder particles having a wide range of particle size distribution with an arbitrary particle size as the center value. Ta. Also dampers 60a, 60
By adjusting and changing the opening degrees of b, 60c, and 60d, the amount of powder passing through the extraction means 59 can be changed, and therefore the value of the center value P4 in FIG. 205 curvature etc. can be changed. In other words, the line in Figure 5 2
210 in the left-right direction and a change in angle θ5 can be realized. Therefore, it was possible to obtain a powder having an arbitrary particle size configuration.

FIG. 6 shows a vertical mill 70 according to a second embodiment of the present invention.
7 is a plan view of the vertical mill 70 of FIG. 6. FIG. This embodiment is similar to the previous embodiment, and corresponding parts are given the same reference numerals. In the vertical mill 70 of this embodiment, rotary blades 72 fixed to the support member 71 in the circumferential direction are provided in the casing 41 as classification blades. The support member 71 is fixed to a rotating shaft 73 that passes through the ejection means 57,
The rotating shaft 73 is rotationally driven by a driving means 74. Further, the upper end portion of each rotary blade 72 is commonly fixed to an annular fixed ring member 72a. What should be noted about the vertical mill 70 of this embodiment having such a configuration is that the rotor blade 72 is directly under the ceiling plate 55.
Air extraction means 59a, 59b, such as ducts, communicate the radially outward space 58 and the exhaust means 57.
59c and 59d are provided. These air extraction means 59 are provided with dampers 60a, 60b, respectively.
60c and 60d are provided.

The classifier 54 includes a rotary blade 72, an air extraction means 59, and the like.

The operating state of the vertical mill 70 having the above configuration will be explained. The process until the granular material is crushed by the crushing roller 44 (not shown) etc. is the first step.
This is the same as the explanation in the example. Casing 4
A part of the powder and granular material that has risen in the interior of the rotary blade 72 is carried by the gas flow between the blades of the rotary blade 72, which is rotated by the gas flow.
However, as a result of colliding with the rotor blade 52, momentum is imparted outward in the radial direction. Among these powder fluids, powder particles exceeding a predetermined particle size determined from the speed of the gas flow, the rotation speed of the rotor blade 72, etc. are separated from the gas flow and fall within the casing 41.

Further, the powder and granular material that has passed through the space between the rotary blades 72 and entered the space 75 is directed toward the discharge means 57. On the other hand, a part of the powder material that has risen inside the casing 41 is taken out from the inside of the casing 41 via the air extraction means 59. The powder and granules taken out via the air extraction means 59 are
The particles move into the discharge means 57 and are naturally mixed with the powder particles moved from the space 56 by the gas flow.

The particle size structure of the granular material crushed and classified as described above is basically the same as that described in the first embodiment. That is, the granular material having the particle size structure shown in FIG. The configuration is shown in Figure 4 2.
is indicated by line 203. If the rotational speed of the rotary blade 72 is increased here, the above-mentioned centrifugal force applied to the powder and granules increases, and the powder and granules with smaller particle sizes are also classified and fall within the casing 41. Therefore, the particle size structure of the powder moving into the space 75 can be as shown by line 203a in FIG. 42.

On the other hand, the particle size composition of the powder passing through the extraction means 59 is shown by the line 204 in FIG.
The particle size composition of the powder and granules obtained by mixing in the fourth
This is indicated by line 205 in FIG. Further, as described above, the particle size structure of the powder falling inside the casing 41 is shown by the line 207 in FIG. 4.

As described above, it was possible to obtain the same effects as those described in the first embodiment. That is, it is possible to obtain granular material having an arbitrary particle size configuration.

FIG. 8 shows a vertical mill 80 according to a third embodiment of the present invention.
FIG. 9 is a plan view of the vertical mill 80 of FIG. 8. This embodiment is similar to the previous embodiment, and corresponding parts are given the same reference numerals. The vertical mill 80 of this embodiment has a casing 41
An inverted substantially conical cone 52 and a classification blade 53 as shown in the first figure are provided in the interior, and a support member 71, a rotating member 72, a rotating shaft 73, and a drive as shown in the sixth figure are provided in the space 56 inside these. A means 74 is provided, and the classification blade is composed of a classification blade 53 and a rotary blade 72.

The noteworthy point of the vertical mill 80 having such a basic configuration is that the air extraction means 59a, 59 communicate the space 58 directly under the ceiling plate 55 and the discharge means 57.
c, and air bleed means 59b and 59d that are directly under the ceiling plate 55 and communicate the space 56 radially outward of the rotor blade 72 and the exhaust means 57 are provided. The air extraction means 59a, 59b, 59c, 59d are provided with dampers 60a, 60b, 60c, 60, respectively.
d is provided.

The operating state of the vertical mill 80 having the above configuration will be explained. Referring also to FIG. 1, raw material powder is supplied from the supply pipe 51 and is crushed between the table liner 42b and the crushing roller 44.
At this time, the weight distribution according to the particle size of the powder and granules during the period after being crushed but not yet classified is shown in Figure 4-1.
as shown by line 202. Air outlet 49
The crushed powder material that has risen inside the casing due to the gas flow from the cone 52 is guided to the classification blade 72 near the top of the cone 52 .

1 of the powder and granular material by the classification blade 53 and the cone 52
The subsequent classification action is similar to the classification action in the first embodiment. The particle size structure of the powder and granules that have moved into the space 56 after this primary classification is shown by line 211 in FIG. 4, indicating that the powder and granules with large particle sizes have been removed. After this primary classification, the powder and granular material is subjected to secondary classification by a rotary blade 72. The classification action by this rotary blade 72 is similar to the classification action in the second embodiment, and the granular material having the particle size structure shown by the line 212 in FIG.
move inside. The powder and granular material in the space 75 is discharged by the discharge means 5
7 by a gas stream.

On the other hand, a part of the powder that has ascended inside the casing 41 and reached the vicinity of the space 58 is removed by the air extraction means 59.
a, 59c to the discharge means 57.
Further, a portion of the powder and granular material in the space 75 after the above-mentioned primary classification is taken out to the discharge means 57 via the air extraction means 59b and 59d. Air extraction means 59a, 59b, 5
The powder and granular material conveyed into the discharge means 57 via 9c and 59d is naturally mixed within the discharge means 57 by the gas flow. As described above, the powder and granules having the particle size distribution of lines 202, 211, and 212 in FIG. The line 205 in FIG. 4 can be obtained.

On the other hand, by adjusting the opening degrees of the dampers 60 provided in the air extraction means 59, the air extraction means 59
9 to the discharge means 60, and the ratio of the powder and granules mixed with the powder and granules moved from the space 75 can be changed. Therefore, the value of the center value P4 of the grain size of the line 205 in FIG. 4 and the curvature of the line 205 can be changed. In other words, it was possible to obtain a powder having an arbitrary particle size configuration.

Air extraction means 59a, 59 in the above embodiments
b, 59c, 59d and the spaces 56, 75 communicating with the discharge means 57 via these are not limited to the combination in this embodiment, but can be widely implemented in any predetermined combination. Further, in a vertical mill 80 equipped with a classification blade 53, a cone 52, and a rotary blade 72 as shown in FIG. 8, the air extraction means 59 is placed radially outside the classification blade 53 as shown in FIGS. You can also do that.

FIG. 10 shows a vertical mill 8 according to a fourth embodiment of the present invention.
5 is a sectional view of FIG. The basic structure of the vertical mill 85 of this embodiment is similar to that of the previous embodiment, and corresponding parts are given the same reference numerals. Vertical mill 8 of this embodiment
5, an inverted substantially conical cone 52 is provided on the table 42, and a support member 7 like the third embodiment (see FIG. 8) is installed between the cone 52 and the ceiling plate 55.
1. A rotary blade 72 is provided. What is noteworthy about the vertical mill 85 of this embodiment having such a basic configuration is that the classification blade 87 is provided between the upper end of the cone 52 and the casing 41, and the space 58 directly under the ceiling plate 55 is and an air extraction means 59 communicating with the exhaust means 57.
This is because we have established the following.

FIG. 11 is a simplified cross-sectional view taken from the section line XI-XI in FIG. 10, and FIG. 12 is a classification blade 87
12 is a simplified side view of FIG. 11 viewed from the direction of arrow D. FIG. The classification blade 87 will be explained with reference to FIGS. 10 to 12. The classification blade 87 has approximately rectangular plate-shaped blade pieces 87a, 87b, ..., 87n (generally referred to as 87) that connect the cone 52 and the casing 41.
and spaced apart in the circumferential direction. For example, the longitudinal direction of the blade 87a coincides with the radial direction of the cone 52, etc., and the angle θ (see FIG. 12) between the blade 87a and the horizontal direction is the same as that of the blade 87a,
87b, . . . , 87n.

Between these wing pieces 87a, 87b, ..., 87n = 88a, 88b, 88c, ..., 88n
(generally referred to as 88), the granular material enters in the direction of arrow E from the lower part of Fig. 10, that is, the lower part of Fig. 12, and is turned in the direction of arrow F. be done. The wing pieces 87a, 87b, ..., 87n arranged in this way are supported by supports 89a,
90a; 89b, 90b;...; 89n, 90n
(collectively referred to as 89, 90),
They are each fixed to the cone 52 and the casing 41 so as to be angularly displaceable.

The operating state of the vertical mill 85 having the above-described configuration is basically the same as that of the previous embodiment. Referring also to FIG. 1, the raw material powder is supplied to the supply pipe 5
1 and is crushed between the table liner 42b and the crushing roller 44. At this time, the weight distribution according to the particle size of the powder or granules during the period after being pulverized but not yet classified is as shown by the line 202 in FIG. 41. When the pulverized powder and granules that have risen inside the casing 41 due to the gas flow from the air outlet 49 pass through the classification blades 87, due to the above-described structure of the classification blades 87, the pulverized powder and granules rise inside the casing 41, for example, as shown in the arrows in FIG. It is rotated in the direction of symbol F, and as described in the explanation of FIG. 1, it is primarily classified by the centrifugal force caused by the rotation.

The particle size structure of the granular material that has moved into the space 58 after the primary classification is shown by the line 211 in FIG. 4, which indicates that the granular material with a large particle size has been removed. After this primary classification, the powder and granular material is subjected to secondary classification by a rotary blade 72. The classification action by the rotary blade 72 is similar to the classification action in the second embodiment, and the powder having the particle size structure shown by the line 212 in FIG. 4 is classified and moved into the space 75. The powder in the space 75 is conveyed to the discharge means 57 by the gas flow.

On the other hand, a portion of the particulate material that has ascended within the casing 41 and reached the vicinity of the space 58 is taken out to the discharge means 57 via the bleed means 59. Air extraction means 59
The powder and granular material conveyed into the discharge means 57 via the
Natural mixing occurs in the evacuation means 57 by the gas flow. As described above, lines 211 and 212 in FIG.
Since the powder particles having a particle size distribution of 1 are mixed in the discharge means 57 and taken out, the particle size composition of the powder particles finally obtained can be made to be as shown in the line 205 in FIG. 4.

On the other hand, the opening degree of 88 between the classification blades 87 is
It is changed by angularly displacing 9 and 90.
By changing the opening degree and the rotation speed of the rotating body 72, a classification effect similar to that described in the above embodiment can be obtained. In other words, the line in Figure 4 1
211 and 212 can be moved in parallel in the left and right direction, and therefore the particle size structure of the powder finally obtained from the discharge means 57 is shown in FIG. The degree of spread of the line 205 in the left-right direction in FIG. 4, the value of the center value P4 of the particle size, etc. can be changed.

FIG. 13 shows a vertical mill 9 according to a fifth embodiment of the present invention.
1, and FIG. 14 is a plan view of the vertical mill 91. The vertical mill 91 of this embodiment is similar to the previous embodiment, and corresponding parts are given the same reference numerals. The noteworthy point of the vertical mill 91 of this embodiment is that the cone 52 is installed inside the casing 41 similarly to the vertical mill 80 shown in the eighth figure of the third embodiment.
and a classification blade 53, and a support member 71, a rotary blade 72, a rotating shaft 73, and a drive device 74 are provided within the cone 52.Secondly, the cone 52 and the rotary blade are provided directly below the ceiling plate 55. Space 56 sandwiched between 72
This is because air extraction means 59a, 59b, 59c, and 59d, such as ducts, are provided to communicate the air discharge means 57 and the exhaust means 57.

The operating state of the vertical mill 91 having such a basic configuration is basically similar to the operating state of, for example, the third and fourth embodiments described above. That is, the powder and granules crushed on the table 42 are transferred to the casing 4
1 and is primarily classified by the classification blade 53, and coarse powder particles whose particle size is larger than a predetermined range can be classified and removed. A part of the granular material moved into the space 56 undergoes secondary classification by the rotary blade 72, and then a part thereof moves into the space 75 and is then moved to the discharge means 57.

The remaining particulate matter in the space 56 is moved to the discharge means 57 via the air extraction means 59, and is naturally mixed with the particulate material moved from the space 75 by the gas flow. That is, as explained in the above-mentioned example, the particle size composition of the powder before and after the primary classification, after the secondary classification, and finally obtained is as shown in lines 202, 211, 212 and lines 202, 211, and 212 in FIG. 4 as shown by line 205 in FIG. Also, by adjusting the opening degree of the gap of the classification blade 53 and the rotation speed of the rotary blade 72, the line 205 in FIG. The degree of spread in the left-right direction, the value of the center value P4, etc. can be changed arbitrarily.

FIG. 15 shows a vertical mill 9 according to a sixth embodiment of the present invention.
FIG. 2 is a cross-sectional view of a portion of FIG. The vertical mill 92 of this embodiment is similar in construction to the vertical mill 80 of the third embodiment described above (see FIG. 8), and corresponding parts are given the same reference numerals. In the vertical mills 40, 70, 80, 85, 91 of the first to fifth embodiments described above, the air extraction means 59 is provided to communicate the ceiling plate 55 and the exhaust means 57, and the space 56 directly under the ceiling plate 55 is provided. , 58 is guided to the exhaust means 57. However, regardless of the arrangement of the air bleed means 59, as shown in FIG. It may be arranged as if it were inside.

FIG. 16 shows a vertical mill 9 according to a seventh embodiment of the present invention.
FIG. 3 is a cross-sectional view of a portion of FIG. The vertical mill 93 of this embodiment is different from the vertical mill 80 (eighth
(see figure), and corresponding parts are given the same reference numerals. In the vertical mills 40, 70, 80, 85, 91 of the first to fifth embodiments described above, the air extraction means 59 is provided to communicate the ceiling plate 55 and the exhaust means 57, and the space 56 directly under the ceiling plate 55 is provided. ,58
The powder inside is guided to exhaust means 57. However, in the present invention, regardless of the arrangement state of the air extraction means 59, the air extraction means 59 as shown in FIG.
may be arranged such that the end opposite to the connecting portion with the discharge means 57 is located in the space 56 between the cone 52 and the rotor blade 72 below the ceiling plate 55.

FIG. 17 shows a classifier 54 according to an eighth embodiment of the present invention.
FIG. 2 is a system diagram of a control device. As explained in the previous embodiment, the powder and granules that have been classified and discharged from the discharge means 57 are collected by the cyclone 130 as a collection means.
is conveyed via conduit 131. cyclone 1
A fan 133 is connected to 30 through a pipe 132, and by sucking only the gas inside the cyclone 130, a swirling motion of the gas and powder inside the cyclone 130 is generated.

A valve means 135 having a function of preventing gas from flowing into the cyclone 130 from the pipe 134 is provided in the pipe 134 that conveys the powder separated from the gas flow in the cyclone 130.

On the downstream side of the valve means 135 in the direction in which the powder or granular material is conveyed within the pipe line 134, the distribution state regarding the particle size of the powder or granular material is detected, and the tangent value N expressed in, for example, the fifth equation is outputted. Detection means 136 is provided for detecting. The powder that has passed through the detection means 136 is taken out as a product.

The value of N output from the detection means 136 is
The value of N is inputted to an adjustment means 137 that controls the operating states of drive devices 74 and 138 that respectively drive the rotary blade 72 and damper 60 that constitute the classifier 54 so that the value of N becomes a predetermined value. Therefore, when the value of N indicating the particle size distribution of the powder detected by the detection means 136 has a deviation from a predetermined value, the adjustment means 137 controls the drive means 7.
4, 138, etc., to adjust the rotation speed of the rotor blade 72, the opening degree of the damper 60, etc.

As a result, the distribution of the particle size of the granular material discharged from the discharge port changes, and the slope of the line 210 in FIG. 52 changes. Therefore, the value of N changes and can be brought closer to a predetermined value.

The damper 60 in the above embodiment was provided in the air extraction means 59, but as shown in FIG.
7 may be provided.

FIG. 19 shows a classifier 54 according to a ninth embodiment of the present invention.
FIG. 2 is a system diagram of a control device. This embodiment is similar to the seventh embodiment described above, and corresponding parts are given the same reference numerals. The pulverized powder material that has risen inside the casing 41 is classified by the classification blades 53 as described in the description of the first embodiment. Space 5 inside cone 52
The powder and granular material that has moved to 6 is discharged from the casing 41 via the discharge means 57, and is conveyed to the cyclone 130b via the pipe line 131b. Further, a portion of the powder and granular material present in the space 58 outside the cone 52 is discharged from the casing 41 by the air extraction means 59, and is conveyed to the cyclone 130a via the conduit 131a.

Cyclones 130a and 130b are connected to pipe line 132
A fan 133 is connected via a and 132b. Pipes 134a, 1 conveying the powder separated from the gas flow in the cyclones 130a, 130b
34b have valve means 135a, 135b, respectively.
is provided. Valve means 135 for the direction in which the powder or granular material is conveyed within the pipes 134a and 134b; a detection means 136 that detects the distribution state regarding the particle size of the powder or granular material, and outputs the value N of the tangent expressed in, for example, Equation 5.
is provided. The powder that has passed through the detection means 136 is taken out as a product.

The value of N output from the detection means 136 is determined by adjusting the value of N in the conduit 132 so that the value of N becomes a predetermined value.
dampers 98 provided in a and 132b, respectively;
The signal is inputted to driving means 98a and 98b for driving 99. Therefore, when the value of N indicating the particle size distribution of the powder detected by the detection means 136 has a deviation from a predetermined value, the adjustment means 137 controls the dampers 98 and 99 via the drive means 99a and 99b. can be driven to change the flow rate and therefore the flow velocity of the gas flow passing through the pipes 132a and 132b. Conduit 13
When the flow rate of the gas flow in 2a, 132b changes,
The amounts of powder and granular material discharged from the bleed means 59 and the discharge means 57 vary.

Therefore, the particle size structure of the powder finally obtained after passing through the detection means 136 changes, and the slope of the line 210 in FIG. 52 changes. In this way, the value of N can be brought close to a predetermined value. Although the air extraction means 59 has been described as being provided on the ceiling plate 55, it may also be provided on the side wall of the casing 41.

Effects According to the present invention as described above, the pulverizing means for performing a pulverizing operation to produce powder and granules is provided below the casing, while the plurality of classification blades are provided below the ceiling plate within the casing. provided. Therefore, when the powder obtained by the crushing means is blown upward by the air flow inside the casing, coarse powder with large particle size falls inside the casing and reaches the classification blades and ceiling plate. Instead, the first classification action is performed at this stage.

Further, after the first classification action, a part of the powder that reaches the classifier equipped with classification blades or the vicinity of the ceiling plate is classified by the classifier, and the remaining part is extracted by an air extraction means. It is directed to a discharge means which communicates with the means. On the other hand, the granular material having a small particle size obtained by classification by the classifier is led to a discharge means and mixed with the granular material from the bleed means to form a product.

Therefore, it is possible to prevent the excessive particle size of the powder or granules immediately after pulverization from being led to the discharge means via the bleed means, and the quality of the obtained product is improved. Furthermore, the movement of the powder and granules by the air extraction means to the discharge means and the classification action by the classifier are performed in parallel on the powder and granules that have reached the vicinity of the classification blade or ceiling plate, as described above. By adjusting the classification action of the classification blade, the classification range regarding the particle size of the powder and granules contained in the resulting product can be adjusted.
For example, it can be set to any range, such as the widest possible range.

[Brief explanation of drawings]

FIG. 1 shows a vertical mill 40 according to a first embodiment of the present invention.
FIG. 2 is a plan view of the vertical mill 40, and FIG.
The figure is a perspective view of the upper part of the vertical mill 40, FIG. 4 is a graph for explaining the operating state of the classifier 54, and FIG.
The figure is a Rosin-Ramler diagram for explaining the operating state of the classifier 54, FIG. 6 is a cross-sectional view of a portion of a vertical mill 70 according to a second embodiment of the present invention, and FIG. 7 is a vertical mill 70 , FIG. 8 is a partial sectional view of a vertical mill 80 according to a third embodiment of the present invention, FIG. 9 is a plan view of the vertical mill 80, and FIG. 10 is a fourth embodiment of the present invention. A cross-sectional view of the example vertical mill 85, FIG. 11 is a simplified cross-sectional view taken from the section line XI-XI in FIG. 10, and FIG.
13 is a sectional view of a vertical mill 91 according to a fifth embodiment of the present invention, and FIG.
4 is a plan view of a vertical mill 91, FIG. 15 is a cross-sectional view of a portion of a vertical mill 92 according to a sixth embodiment of the present invention, and FIG. 16 is a vertical mill according to a seventh embodiment of the present invention. 93, FIG. 17 is a cross-sectional view of a part of
System diagram of the control device of the classifier 54 of the embodiment, 1st
8 is a cross-sectional view of a portion of a vertical mill according to another embodiment of the present invention shown in FIG. 17, FIG.
21 is a sectional view of another prior art vertical mill 20, and FIG. 22 is a Rosin-Ramler line for explaining the classification effect of the vertical mill 20. FIG. 23 is a sectional view of yet another prior art vertical mill 30. 41...Casing, 52...Cone, 53,
87...Classifying blade, 54...Classifier, 55...Ceiling plate, 57...Discharge means, 59...Air extraction means, 72
...Rotary blade, 130, 130a, 130b...Cyclone, 133...Fan, 135...Valve means, 136...Detection means, 137...Adjustment means.

Claims (1)

[Scope of Claims] 1. A casing having a ceiling plate, a crushing means comprising a table and a crushing roller provided below in the casing, and an air current that blows the powder and granules obtained by the crushing means upward in the casing. a classifier equipped with a plurality of classification blades provided along the circumferential direction below the ceiling plate; and an air extraction device provided radially outward of the classification blades for taking out the powder and granular material out of the casing; A vertical mill characterized in that it includes a discharge means provided radially inward of each classification blade for taking out the powder and granules out of the casing and communicating with an air extraction means. 2. Adjustment means for adjusting the size of the flow area through which the powder and granules of the air extraction means flow, a means for collecting the powder and granules from the discharge means, and the powder and granules collected by the collection means. detecting means for detecting a distribution state regarding the particle size of the particle size and outputting a value related to this distribution state, activating the adjusting means so that the output value becomes a predetermined value; 2. The vertical mill according to claim 1, wherein the size of the flow-through portion is changed by the adjusting means.