JPH08299836A - Fluidized bed type classifier and crushing apparatus equipped with the same - Google Patents

Abstract

PURPOSE: To provide a fluidized bed type classifier which has a good classification performance, can be downsized, is resistant to abrasion, and is easy in maintenance. CONSTITUTION: This apparatus is composed of a vertical type cylindrical classifier main body 11, a slanted air diffusion plate 12 installed in the lower part of the main body 11, an air introduction chamber 14 formed on the lower side of the diffusion plate 12, and an exhaust opening 27 formed in the upper part of the main body 11. The apparatus is equipped with a particle supply port 16 for supplying particles A, which is located close to the surface of the diffusion plate 12 in the main body 11, a coarse particle outlet 18 formed on the lower end side of the diffusion plate 12 on the periphery of the main body 11, and a fine granule outlet 22 formed on the periphery of the main body 11. A stable fluidized bed is formed in the main body 11, coarse particles C are removed from the outlet 18 and fine particles B are taken out by being made to overflow into the outlet 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluidized bed type classifier and a crushing equipment equipped with the classifier.

[0002]

2. Description of the Related Art Generally, in an apparatus for producing cement or the like, a cement raw material such as cement clinker is preliminarily crushed by a preliminary crusher such as a vertical mill, and the raw material of the preliminarily crushed powder is sent to a classifier. After classifying into fine and coarse particles,
The coarse particles are returned to the preliminary pulverizer for pulverization, and the fine particles are sent to a main pulverizer such as a ball mill for further pulverization to obtain a fine powder as a product.

Conventionally, as a classifier used in such an apparatus, there is a sieve type classifier 1 as shown in FIG. 4, and the sieve type classifier 1 has a powder / granule introduction port 2 in the upper part. In the classifier body 3, a sieve 4 slanted downward is provided in multiple stages so that the mesh of the sieve 4 gradually becomes finer toward the lower stage (5 in FIG. 4).
A fine particle distribution chamber 5 which is disposed in the lowermost stage 4 and is inclined in the same direction as the sieve 4 and which is communicated with the fine particle distribution chamber 5 at the lower end of the fine particle distribution chamber 5. An outlet 6 is provided, a coarse-grained flow chamber 7 is formed on the side of the lower end of each of the sieves 4, and a coarse-grained outlet 8 that communicates with the coarse-grain flow chamber 7 is provided. A vibration generator 9 for vibrating the sieve 4 is provided.

In the sieve type classifier 1 described above, the granular material A preliminarily pulverized by the preliminary pulverizer (not shown) is introduced from the granular material inlet 2 and each sieve 4 is moved by the vibration generator 9. When vibrated, first, only the granular material A that cannot pass through the coarsest mesh 4 of the uppermost stage remains on the sieve 4, and those having a particle size smaller than that fall onto the lower sieve 4 and this action Is sequentially repeated in each sieve 4, and only the fine particles B are dropped from the lowermost sieve 4. The fine particles B dropped from the lowermost sieve 4 pass through the fine particle flow chamber 5 and the fine particle outlet 6 Is sent to a main crusher (not shown) and crushed. Further, the coarse particles C, which have moved toward the lower end side by vibration on the sieve 4 without dropping from the mesh of each sieve 4, drop into the coarse particle flow chamber 7 and are sent from the coarse particle outlet 8 to the preliminary crusher. It is pre-crushed again.

[0005]

However, in the case of the conventional sieve type classifier 1, when the powder particles A to be classified are highly abrasive such as cement clinker, each is vibrated by the vibration generator 9. Due to continuous collision between the sieve 4 and the granular material A, the respective sieves 4 are severely worn. Therefore, it is necessary to replace each sieve 4 frequently (about once every two months), and this replacement work is difficult. Therefore, the maintenance is troublesome, and the classification efficiency is poor because the classification work must be stopped at the time of maintenance. In addition, the classification by the sieve 4 is apt to cause clogging, resulting in poor classification efficiency and a large amount of powder. In order to process the granules A, there is a problem that the device becomes very large, and further, there is a problem that the vibration of the classifier body 3 by the vibration generating device 9 adversely affects other peripheral devices.

In view of the above-mentioned circumstances, the present invention provides a fluidized bed type classifier which is excellent in classifying performance, can be downsized, and has little wear and maintenance, and a crushing equipment equipped with the classifier. It was made for the purpose.

[0007]

A fluidized bed type classifier according to the present invention comprises a classifier body having a cylindrical shape, and a tilted diffuser plate which is provided at a lower portion of the classifier body. An air introducing chamber formed below the inclined diffuser plate, an exhaust port provided in the upper part of the classifier body, and a powder or granular material approaching on the inclined diffuser plate in the classifier body. A granular material supply port arranged to supply the powder, a coarse particle outlet formed at the lower end side of the inclined diffuser plate in the outer periphery of the classifier body, and a fine particle formed at the outer peripheral required height position of the classifier body. It is characterized by having an exit.

Further, a plurality of fine particle outlets are installed at the upper and lower stages,
Moreover, it is characterized in that each fine particle outlet is provided with an on-off valve.

Further, the present invention is characterized in that the powdery or granular material supply port is provided with an airtight supply device capable of maintaining the airtightness and quantitatively supplying the powdery or granular material.

Further, it is characterized in that the coarse-grain outlet and the fine-grain outlet are provided with airtight discharge devices capable of discharging a fixed amount while maintaining airtightness.

Further, the present invention is characterized in that a discharge control valve is provided at the coarse particle extraction opening of the classifier body.

The crushing equipment equipped with the fluidized bed type classifier of the present invention comprises a classifier body having a cylindrical shape and erected, and an inclined air diffusing plate provided obliquely below the classifier body. An air introduction chamber formed below the inclined diffuser plate, a granular material supply port arranged to approach the inclined diffuser plate in the main body of the classifier to supply the granular material, and the classification The coarse particle outlet formed at the lower end side of the inclined diffuser plate in the outer periphery of the machine body, the discharge control valve installed in the coarse particle outlet opening of the classifier body, and the outer peripheral required height position of the classifier body The fluidized bed type classifier equipped with the formed fine particle outlet, the preliminary crusher that takes in the raw material from the raw material input pipe and performs preliminary crushing, and the preliminary crusher while measuring the raw material of the raw material hopper with a weight scale. The raw material feeding device for feeding the raw material feeding pipe and the powder and granules crushed by the preliminary crusher are conveyed upward to A granular material conveying device for supplying to the granular material supply port of the fluidized bed classifier, and a coarse particle returning path for supplying coarse particles discharged from the coarse particle outlet of the fluidized bed classifier to the raw material supply device. And a main crusher for obtaining fine powder by taking in and crushing fine particles from a fine particle outlet of a fluidized bed type classifier.

Further, the preliminary crusher is characterized in that it is a vertical roller mill for pressing the crushing roller against the rotating crushing table to perform preliminary crushing of the raw material supplied from the raw material feeding pipe.

Further, the present crusher is characterized in that it is a ball mill for crushing with balls inserted inside a rotating rotary drum.

[0015]

In the fluidized bed type classifier of the present invention, the powder or granules supplied from the powder or granular material supply port in close proximity to the inclined diffuser plate in the main body of the classifier are supplied to the air introduction chamber to be inclined or dispersed. It is fluidized by the air jetted substantially uniformly from the entire surface of the air plate, so that a fluidized bed in which the upper layer is fine particles and the lower layer is coarse particles is formed. At this time, since the granular material is supplied close to the inclined diffuser plate by the granular material supply port, it is possible to prevent the formation of the fluidized bed from being disturbed by the supply of the granular material. You can

The fine particles floating in the upper part of the fluidized bed formed in the main body of the classifier flow into the fine particle outlet and are taken out to the outside, and the coarse particles in the lower part of the fluidized bed flow on the inclined diffuser plate. While flowing, it moves to the lower end side and is taken out from the coarse particle outlet.

At this time, a stable fluidized bed is formed in the fluidized bed chamber, and only the fine particles in the upper part of the fluidized bed are overflowed into the fine particle outlet to be separated, so that only the fine particles are accurately classified. In addition, a large amount of powder and granules can be continuously classified, and the device can have a small size and a simple structure.

Further, a plurality of fine particle outlets are provided at the upper and lower stages,
Further, by providing an opening / closing valve at each of the fine particle outlets, the fluidized bed in which the particle size distribution is formed in the classifier body such that the particle size gradually increases from the upper side to the lower side, By opening and closing the on-off valve to change the height position at which the fine particles are taken out, it is possible to change the particle size of the taken-out fine particles and also change the taken-out amount of the fine particles.

Further, since the powdery or granular material supply port is provided with an airtight supply device capable of maintaining the airtightness and quantitatively supplying the powdery or granular material, the powdery or granular material supply side is provided in the fluidized bed formed in the main body of the classifier. Since it is possible to prevent the change of the external pressure from acting, the fluidized bed becomes stable, and the classification with higher accuracy becomes possible.

Further, by providing an airtight discharge device at the fine particle outlet and the coarse particle outlet, it is possible to prevent a change in pressure outside the outlet side from acting on the fluidized bed formed inside the classifier body. As a result, it is possible to stabilize the fluidized bed and perform more accurate classification.

Further, since the discharge control valve is provided at the opening of the coarse particle outlet of the main body of the classifier, the amount of the coarse particles taken out can be adjusted to adjust the residence time of the granular material in the main body of the classifier. Thus, the classification performance can be changed.

In the pulverizing equipment equipped with the fluidized bed type classifier of the present invention, the raw material of the raw material hopper is fed to the preliminary pulverizer by the raw material feeding device to be pulverized into the granular material, and the granular material is the granular material. The powder is supplied to the position close to the inclined diffuser plate of the fluidized bed classifier through the powder supply port by the body transporting device.

The powder and granules supplied onto the inclined diffuser plate are fluidized by the air supplied to the air introduction chamber and ejected substantially uniformly from the entire surface of the inclined diffuser plate, and the upper layer is fine particles and the lower layer is A coarse fluidized bed is formed, and the floating fine particles in the upper part of the fluidized bed flow into the fine particle outlet and are taken out to the outside.
The coarse particles in the lower part of the fluidized bed move to the lower end side while flowing on the inclined diffuser plate, and are taken out from the coarse particle outlet.

The coarse particles discharged from the coarse particle outlet of the fluidized bed classifier are returned to the raw material supply device through the coarse particle returning path, and the fine particles discharged from the fine particle outlet are pulverized. It is supplied to a main crusher which is adapted to obtain fine powder, and is then main crushed.

Since the preliminary crusher is a vertical roller mill for crushing the raw material supplied from the raw material feeding pipe by pressing the pulverizing roller against the rotating pulverizing table, it is possible to efficiently pulverize a large amount of raw material with a small preliminary pulverizer. Can be done on a regular basis.

When the present crusher is a ball mill, the ball mill is excellent in the ability to produce fine powder from fine particles, so that stable production of fine powder becomes possible. On the other hand, in the ball mill, the load fluctuates depending on the particle size and the amount of fine particles supplied, and stable operation is impeded by fluctuations in the particle size of the refined powder. By adjusting the opening of the discharge control valve at the take-out opening, the amount of coarse particles returned to the raw material supply device via the coarse particle return path is adjusted, and the particle size and amount of fine particles supplied to the ball mill are adjusted. By doing so, stable operation of the ball mill can be achieved.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an example of a fluidized bed type classifier 10 according to the first to fifth aspects of the present invention, in which a cylindrical classifier body is erected so that its axial center is oriented vertically. 11 is provided, and an inclined diffuser plate 12 that is inclined downward from one side (left side) to the other side (right side) is provided at the bottom of the classifier body 11. The inclined diffuser plate 12 is composed of a perforated plate, a mesh material, felt, and the like, and an air introduction chamber 14 for introducing the flowing air 13 is formed below the inclined diffuser plate 12. The inclined diffuser plate 12 shown in FIG. 2 has a large number of small holes 1
5 shows the case of a perforated plate in which 5 are opened so as to be distributed substantially uniformly.

In the upper part of the classifier body 11, there is provided a granular material supply port 16 whose lower end approaches the inclined diffuser plate 12 and supplies the granular material A. Further, an airtight supply device 17 such as a rotary valve which is capable of quantitatively supplying the powdery particles A while maintaining airtightness at the powdery material supply port 16.
It has. As shown in FIG. 2, the powder or granular material supply port 16 may be installed at the center position of the classifier body 11, or may be installed eccentrically on the upper end side of the inclined diffuser plate 12. Good.

A coarse particle outlet 18 is formed at the lower end side of the inclined air diffuser plate 12 in the outer periphery of the classifier body 11, and the coarse particle outlet 18 is kept airtight to provide coarse particles C. An airtight discharge device 19 such as a rotary valve capable of discharging a fixed amount is provided. Further, a discharge control valve 20 is provided at the coarse particle extraction opening 18a of the classifier body 11. Reference numeral 21 denotes a drive device for the discharge control valve.

A fine particle outlet 22 is formed at a required height position on the outer periphery of the classifier body 11.

In the case of FIG. 1, three stages of fine grain outlets 22a, 22b, 22c are provided, and each of the fine grain outlets 22a, 22b, 22c is provided with an on-off valve 23a such as a gate valve. A drive device 24 for arranging 23b and 23c and driving the opening and closing of the on-off valves 23a, 23b and 23c.
The case where a, 24b, and 24c are provided is shown. The fine particle outlets 22a, 22b, 22c are connected to a single fine particle take-out pipe 25, and the fine particle take-out pipe 25 has an airtight discharging device 26 such as a rotary valve capable of quantitatively discharging the fine particles B while keeping airtightness. Is provided.

In the case of FIG. 1, the fine particle outlets 22a, 22
b and 22c are the coarse-grain outlets 18 on the lower end side of the inclined diffuser plate 12.
Although the example is installed above the above, it may be installed at any same position on the outer circumference of the classifier body 11 or at a different position, and a single fine powder outlet 22 or a plurality of fine powder outlets 22 may be provided at each stage. It may be formed.

Further, an exhaust port 27 is formed in the upper part of the classifier body 11. The exhaust port 27 is the suction fan 2
8 is connected to the fine powder collecting device 29 that is sucked by 8, and the air in the classifier body 11 is sucked,
The fine powder contained in the exhaust gas is collected.

The operation of the above embodiment will be described.

The granular material A from the airtight supply device 17 is supplied into the classifier body 11 from the granular material supply port 16 which is opened close to the inclined diffuser plate 12, and is supplied to the air introduction chamber 14. Fluidized by the air 13 which is jetted substantially uniformly from the entire surface of the inclined diffuser plate 12, a fluidized bed in which the upper layer is fine particles and the lower layer is coarse particles is formed. At this time, since the granular material A is supplied close to the inclined diffuser plate 12 by the granular material supply port 16, the formation of the fluidized bed is prevented from being disturbed by the supply of the granular material A. can do.

The fine particles B floating in the upper part of the fluidized bed formed in the main body 11 of the classifier are the fine particle outlet 22.
Flowing into the bed and taken out to the outside, and the coarse particles C in the lower part of the fluidized bed
Is moved to the lower end side while flowing on the inclined diffuser plate 12, and is taken out from the coarse-grain outlet 18 to the outside.

At this time, the plurality of fine particle outlets 22a, 22b, 22c are installed as described above, and the on-off valves 23a, 23 are provided at the respective fine particle outlets 22a, 22b, 22c.
b and 23c, as shown in FIG.
When 3b and 23c are closed and only the opening / closing valve 23a is opened, only the uppermost fine particles B ₁ of the fine particles B of the fluidized bed can be overflowed and taken out to the fine particle outlet 22a, and the open / close valves 23a and 23c can be opened. When only the on-off valve 23b is opened by closing, the fine particles B ₂ in the middlemost portion of the fluidized bed are discharged from the fine particle outlet 22
It can be taken out by overflowing to b. At this time, the fine particles B ₂ include those having a particle size larger than that of the fine particles B ₁ , and therefore the amount of extraction is large.

Further, when the on-off valves 23a and 23b are closed and only the on-off valve 23c is opened, the fine particles B ₃ in the relatively low portion of the fluidized bed can be taken out by overflowing to the fine particle outlet 22c. At this time, the fine particles B ₃ include those having a particle size larger than that of the fine particles B ₂ , and therefore, the taken-out amount is further increased.

The operation of changing the particle size and the amount of the fine particles to be taken out can be performed without providing the opening / closing valve 23a at the uppermost stage, and the plural fine particle take-out ports 22 are provided.
It is also possible to provide a single fine particle outlet 22 instead of the method in which the above is provided. In that case, the particle size and the amount of the fine particles B to be taken out cannot be changed and is always constant. Only the fine particles B having a particle size equal to or smaller than the above are taken out. Also in the case of this single fine particle outlet 22, the fine particles B can be adjusted by adjusting the pressure of the air 13 introduced into the air introduction chamber 14.
Although it is possible to adjust the particle size and the amount to be taken out to some extent, it is not so preferable because it is difficult to control the pressure and the formation of the fluidized bed tends to become unstable.

As described above, a stable fluidized bed is formed in the classifier body 11, and the fine particles B in the upper part of the fluidized bed are formed.
Since only the fine particles are overflowed to the fine particle outlets 22a, 22b, 22c to be separated, the fine particles B and the coarse particles C can be accurately classified, and a large amount of powder A is continuously processed. Therefore, the device can be downsized.

Further, since the powdery or granular material supply port 16 is provided with the airtight supply device 17 capable of quantitatively supplying the powdery or granular material while maintaining the airtightness, the powdery particles are provided in the fluidized bed formed in the classifier body 11. It is possible to prevent a change in pressure outside the body supply side from acting, stabilize the fluidized bed, and perform more accurate classification.

Further, the coarse particle outlet 18 and the fine particle outlet pipe 25
Since the airtight discharge devices 19 and 26 are provided in the above, the fluidized bed formed inside the classifier body 11 is prevented from being affected by the change in the pressure outside the take-out side to further stabilize the fluidized bed. Highly accurate classification can be performed.

Further, the coarse particle take-out opening portion 1 of the classifier body 11
Since 8a is provided with the discharge control valve 20, the amount of the coarse particles C taken out is adjusted, the residence time of the powder A in the classifier body 11 is adjusted, and the classification performance of the fluidized bed classifier 10 is improved. Can be changed.

FIG. 3 shows an embodiment of a pulverizing equipment equipped with a fluidized bed type classifier according to the inventions of claims 6 to 8. The fluidized bed type classification has the construction shown in FIGS. 1 and 2. A preliminary crusher 30 is provided on the upstream side of the machine 10.

The preliminary crusher 30 presses the crushing roller 34 against the crushing table 33 which is rotated by the drive motor 31 through the speed reducer 32, and preliminarily crushes the raw material W supplied through the raw material feeding pipe 35 to powder the powder. The case of a vertical roller mill 30a adapted to obtain the granules A is shown.

Further, the raw material W of the raw material hopper 37 is weighed 3 times.
A raw material supply device 39 of a conveyor type or the like for supplying the raw material W to the raw material feeding pipe 35 of the preliminary crusher 30 driven by the drive motor 38 while being measured by 6.

Further, the granular material A crushed by the preliminary crusher 30
Is the powder and granular material conveying device 4 via the chain conveyor 40 or the like.
I am trying to supply one. The powder and granular material conveying device 41 is
It is composed of a bucket elevator 41a or the like driven by a drive motor 42, receives the powder A from the chain conveyor 40 at the lower end and conveys it upward, and the powder of the fluidized bed classifier 10 from the upper end. It is adapted to be supplied to the body supply port 16.

A coarse-grain returning path 43 is provided for feeding the coarse grains C discharged from the coarse-grain outlet 18 of the fluidized bed classifier 10 to the raw material supply device 39.

Further, on the downstream side of the fluidized bed type classifier 10, the coarse particles from the fine particle outlet 22 are taken into a rotating drum 45a and rotated, and balls (steel balls) 45b charged inside are introduced.
Ball mill 4 which was crushed by the method to obtain fine powder
The main crusher 44 composed of 4a is provided.

In the pulverizing equipment equipped with the fluidized bed classifier 10, the raw material W of the raw material hopper 37 is supplied to the preliminary pulverizer 30 by the raw material supply device 39 to be pulverized to form the granular material A. The body A is supplied from the chain conveyor 40 to the powder / granular material conveying device 41 and is conveyed to the upper part, and is supplied to a position close to the inclined air diffuser plate 12 of the fluidized bed classifier 10 via the powder / granular material supply port 16. To be done.

Granule A supplied on the inclined diffuser plate 12
Is fluidized by the air 13 supplied to the air introduction chamber 14 and jetted substantially uniformly from the entire surface of the inclined diffuser plate 12, so that a fluidized bed in which the upper layer is fine particles and the lower layer is coarse particles is formed. , The fine particles B in the upper part of the fluidized bed flow into the fine particle outlet 22 and are taken out to the outside, and the coarse particles C in the lower part of the fluidized bed move to the lower end side while flowing on the inclined diffuser plate 12, It is taken out from the outlet 18.

The coarse particles C discharged from the coarse particle outlet 18 of the fluidized bed type classifier 10 are returned to the raw material supply device 39 through the coarse particle return passage 43 and also discharged from the fine particle outlet 22. The fine particles B are supplied to a main crusher 44, which is adapted to obtain a fine powder by crushing, and is then main crushed.

In the preliminary crusher 30, a crushing roller 34 is pressed against a rotating crushing table 33, and a raw material feeding pipe 35 is provided.
When the vertical roller mill for crushing the raw material W supplied from the above is used, the small-sized preliminary crusher 30 can efficiently perform the preliminary crushing of a large amount of the raw material W.

When the main crusher 44 is the ball mill 44a, the ball mill 44a has an excellent ability to produce a refined powder from the fine particles B, so that a stable refined powder can be produced. On the other hand, in the ball mill 44a, the load fluctuates depending on the particle size and the supply amount of the fine particles B to be supplied, and the stable operation is hindered due to the fluctuation of the particle size of the refined powder. Ejection control valve 2 for coarse grain extraction opening 18a
The opening degree of 0 is adjusted to adjust the return amount of the coarse particles C to be returned to the raw material supply device 39 through the coarse particle return path 43, and to adjust the particle size and the supply amount of the fine particles B to be supplied to the ball mill 44a. As a result, stable operation of the ball mill 44a can be achieved. Further, in this case, as shown in FIG. 1, a plurality of stages of fine particle outlets 22a, 22b, 22c and an on-off valve 23 are provided.
By providing a, 23b and 23c, the on-off valve 2
By adjusting the opening and closing of 3a, 23b, 23c,
The particle size and the supply amount of the fine particles B supplied to the ball mill 44a can be changed.

[0056]

According to the fluidized bed classifier of the present invention, a stable fluidized bed is formed in the main body of the classifier, and only the fine particles in the upper part of the fluidized bed are overflowed to the fine particle take-out port and separated. Therefore, only fine particles can be accurately classified at the fine particle outlet, and a large amount of powdery particles can be continuously classified, so that the device can be made small and have a simple structure.

Further, since a stable fluidized bed is formed and classification is performed, a large amount of powder and granules can be continuously and efficiently treated as compared with the conventional sieve type classifier, and abrasion is prevented. Is less likely to occur and maintenance is easy.

In addition, a plurality of fine particle outlets are installed at the upper and lower stages,
And by providing an opening / closing valve at each fine particle outlet, for the fluidized bed in which the particle size distribution is formed so that the particle size gradually increases from the upper part to the lower part in the classifier body,
By changing the height position at which the fine particles are taken out by opening and closing the on-off valve, the particle size of the taken out fine particles can be changed, and the taken-out amount of the fine particles can also be changed.

Further, since the powdery or granular material supply port is provided with an airtight supply device capable of maintaining airtightness and quantitatively supplying the powdery or granular material, the powdery or granular material supply side is provided in the fluidized bed formed in the main body of the classifier. Since it is possible to prevent the change of the external pressure from acting, the fluidized bed becomes stable, and the classification with higher accuracy becomes possible.

Further, by providing an airtight discharge device at the fine particle outlet and the coarse particle outlet, it is possible to prevent a change in the pressure outside the outlet side from acting on the fluidized bed formed in the main body of the classifier. As a result, it is possible to stabilize the fluidized bed and perform more accurate classification.

Further, since the discharge control valve is provided at the opening of the coarse particle outlet of the classifier body, it is possible to adjust the amount of the coarse particles to be taken out to adjust the residence time of the powdery particles in the classifier body. Thus, the classification performance can be changed.

The crushing equipment equipped with the fluidized bed classifier of the present invention is equipped with the fluidized bed classifier having excellent classifying performance. It is possible to carry out efficient pulverization by continuously and efficiently performing an operation of classifying into fine particles and coarse particles and a main pulverizing operation of main pulverizing the fine particles to obtain a fine powder.

Since the preliminary crusher is a vertical roller mill for crushing the raw material supplied from the raw material feeding pipe by pressing the pulverizing roller against the rotating pulverizing table, it is possible to efficiently pulverize a large amount of raw material with a small preliminary pulverizer. Can be done on a regular basis.

Further, when the crusher is a ball mill, the ball mill has an excellent ability to produce fine powder from fine particles, so that stable fine powder can be produced. On the other hand, in the ball mill, the load fluctuates depending on the particle size and the amount of fine particles supplied, and stable operation is impeded by fluctuations in the particle size of the refined powder. By adjusting the opening of the discharge control valve at the take-out opening, the amount of coarse particles returned to the raw material supply device via the coarse particle return path is adjusted, and the particle size and amount of fine particles supplied to the ball mill are adjusted. By doing so, stable operation of the ball mill can be achieved.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the inventions of claims 1-5.

FIG. 2 is a view taken along the line II-II of FIG.

FIG. 3 is an overall schematic view showing an embodiment of the inventions of claims 6-8.

FIG. 4 is a vertical cross-sectional view showing an example of a sieve type classifier used conventionally.

[Explanation of symbols]

 10 Fluidized Bed Classifier 11 Classifier Main Body 12 Inclined Diffuser Plate 14 Air Introducing Chamber 16 Powder and Granules Supply Port 17 Airtight Feeder 18 Coarse Grain Outlet 18a Coarse Grain Outlet 19 Airtight Ejector 20 Emission Control Valve 22 Fine Grain Outlet 22a Fine particle outlet 22b Fine particle outlet 22c Fine particle outlet 23a Open / close valve 23b Open / close valve 23c Open / close valve 26 Airtight discharge device 27 Exhaust port 30 Pre-crusher 30a Vertical roller mill 33 Grinding table 34 Grinding roller 35 Raw material input pipe 36 Weight Total 37 Raw material hopper 39 Raw material supply device 41 Powder or granular material conveying device 43 Coarse particle return path 44 Main crusher 44a Ball mill 45a Rotating drum 45b Ball (steel ball) A Powder or granule B Fine particle C Coarse particle W Raw material

Claims (8)

[Claims] 1. A classifier body having a cylindrical shape, which is erected upright, an inclined air diffuser plate which is inclinedly provided at a lower portion of the classifier body, and air formed below the inclined air diffuser plate. An introduction chamber, an exhaust port provided on the upper part of the classifier body, a granular material supply port arranged to approach the inclined diffuser plate in the classifier body to supply the granular material, and a classifier A fluidized bed type classification characterized by comprising a coarse particle outlet formed at the lower end side of the inclined diffuser plate in the outer peripheral portion of the main body, and a fine particle outlet formed at the required outer peripheral height of the classifier body. Machine. 2. The fluidized bed type classifier according to claim 1, wherein a plurality of fine particle outlets are provided in upper and lower stages, and an opening / closing valve is provided at each of the fine particle outlets. 3. The fluidized bed type classifier according to claim 1, wherein the powdery or granular material supply port is provided with an airtight supply device capable of quantitatively supplying the powdery or granular material while maintaining airtightness. 4. The fluidized bed type classification according to claim 1, wherein the coarse particle outlet and the fine particle outlet are provided with airtight discharging devices capable of quantitatively discharging while maintaining airtightness. Machine. 5. The fluidized bed classifier according to claim 1, 2 or 3 or 4, wherein a discharge control valve is provided at the coarse particle outlet of the classifier body. 6. A classifier body having a cylindrical shape, which is erected upright, an inclined air diffusing plate provided at a lower portion of the classifier body, and air formed below the inclined air diffusing plate. An introduction chamber, a granular material supply port arranged so as to approach the inclined diffuser plate in the main body of the classifier to supply the granular material, and a lower end side position of the inclined diffuser plate in the outer peripheral portion of the main body of the classifier Fluidized bed type equipped with a coarse particle outlet formed in, a discharge control valve installed in the coarse particle outlet of the classifier body, and a fine particle outlet formed at the outer peripheral required height position of the classifier body. A classifier, a preliminary crusher that takes in the raw material from the raw material input pipe and performs preliminary crushing, a raw material supply device that supplies the raw material in the raw material hopper to the raw material input pipe of the preliminary crusher while measuring the raw material in the raw material hopper, and the preliminary crush The powder and granules crushed by the machine are conveyed upward and supplied to the powder and granules supply port of the fluidized bed type classifier. A granular material conveying device, a coarse particle return path for feeding coarse particles discharged from the coarse particle outlet of the fluidized bed classifier to the raw material supply device, and a fine particle outlet of the fluidized bed classifier. A pulverizer equipped with a fluidized bed type classifier, which comprises a main pulverizer that obtains fine powder by taking in and pulverizing fine particles. 7. The flow according to claim 6, wherein the preliminary crusher is a vertical roller mill that performs preliminary crushing of the raw material supplied from the raw material feeding pipe by pressing the pulverizing roller against the rotating pulverizing table. Crushing equipment equipped with a layered classifier. 8. The fluidized bed classifier according to claim 6 or 7, wherein the pulverizer is a ball mill that pulverizes with balls inserted in a rotating rotary drum. Crushing equipment.