JP2597794B2 - Method and apparatus for classifying powder raw materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder raw material classification apparatus for separating raw materials into coarse powder and fine powder.

[0002]

2. Description of the Related Art Conventionally, startervant type separators or cyclone separators used in cement production directly disperse raw materials to be classified in a circulating airflow rising in a classification chamber, and are collected in the classification chamber by virtue of inertia. Into coarse powder particles and fine powder particles transported outside the classification room by the circulating airflow.

The classification mechanism of such a startervant type separator or cyclone separator has the following disadvantages. In the classifying section, re-agglomeration is likely to occur when the fine powder in the circulating airflow and the coarse powder particles classified by the inertial force and gravity are mixed. Semi-free vortices, forced vortices, and circulating airflows exist inside the classification chamber, and the force acting on the classification is complicated, and the classification field is easily disturbed by changes in the powder concentration and the like.
The particle size of the fine powder particles tends to fluctuate. Since the fluid resistance of the airflow, the inertial force, and the gravity in the classification chamber continuously act on the particles, the particles in the particle size range where the fluid resistance and the gravity balance are retained in the classification field, the dust concentration increases, and the classification blades This can cause particles to adhere to the surface. In order to solve these drawbacks, a new classifier (Japanese Patent Application No. 61-41434, Publication No. 3-14514) has been developed.

As shown in FIG. 6, the classifying device developed includes rectifying plates 2, 3, 4, and 5 in which a plurality of horizontally oriented annular flat plates are arranged at equal intervals in a classifying section 1. Board 2,
A centrifugal wheel having a plurality of classifying blades 6 provided radially and vertically between 3, 4 and 5 and fixed radially from the center of rotation to the outer peripheral direction or at a predetermined angle in the anti-rotational direction; A classifying rotating body 1a forming an impeller similar in shape to a blower is provided.

Circular holes 7, 8, and 9 are formed in the current plates 3, 4, and 5 except for the uppermost stage, and the diameter of the holes 7, 8, and 9 decreases from the lowermost stage to the upper stage. Go. The raw material introduction pipe 10 is provided immediately below the hole 7 of the lowermost straightening plate 5 with the hole 7.
And the same number of them are erected. A raw material introduction pipe 10 penetrates through the cone portion 11 forming the coarse powder collecting portion below the classifying portion up to immediately below the hole portion 7 of the current plate 5, and the lower end portion of the cone portion 11 is rotatably connected via a pipe 12. It is connected to the valve 13 and is air-locked by the rotary valve 13.

A fine powder take-out pipe 14 of fine powder sucked from the center of the classifying rotator 1a is connected to the upper part of the casing on the outer peripheral side of the rotating shaft arrangement portion, and flows from the center of the classifying rotator 1a to the airflow. The fine powder conveyed on board can be sucked, and the other end is connected to an external bag filter to separate a solid component and a gas component.

In this apparatus, the raw material inflow path and the coarse particle discharge path are separated to prevent reagglomeration due to mixing of the input raw material and the coarse particle particles, and through the hole 7 of the current plate 5. Since the raw material is supplied, the flow of the air flow in the classifier becomes intermittent, and there is no particle size range in which the centrifugal force given by the classifying rotator 1a and the centripetal force given by the air flow balance in the classifier. There is no stagnation of raw materials inside the device.

[0008]

In an apparatus provided with such a classifying section 1, when a powder which is liable to wear or a powder having a high adhesion is used, when the apparatus is operated under a condition of a high powder concentration. Then, the following problems occur. Since the structure is such that the fine powder is sucked upward, as the powder concentration increases, the lifting pressure loss of the powder increases, and when the powder concentration increases, the fine powder falls to the coarse powder collecting section. Since there is no mechanism for dispersing the raw material, there is a possibility that the aggregate of the fine powder particles is classified to the coarse powder particles. The rotational momentum of the raw material introduced into the classifying chamber is small, and the entire inside of the classifier wears quickly. Accordingly, an object of the present invention is to provide a method and apparatus for classifying a powder raw material capable of reducing pressure loss, improving dispersing ability, and reducing mechanical wear in order to solve these problems. To provide.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a new classification method and a classification method as shown in FIG. 1 or FIG. 5 for applying the method. Configure the device.

As a method of classifying the powder raw material, the powder raw material is charged into the dispersion chamber from the upper portion of the casing, and a radial mechanical force is applied to the raw material charged in the dispersion chamber while the air in the circumferential direction is applied. A mechanical force is applied to disperse, and the dispersed material is introduced into the classifying chamber from the periphery of the dispersion chamber, where the mechanical force in the radial direction and the aerodynamic force in the centripetal direction are applied in the classifying chamber. By applying force and classifying, the classified fine powder is sucked and discharged from the central part of the classifying chamber through a fine powder take-out part below the casing, and the classified coarse powder is re-dispersed and dispersed at the peripheral part of the classifying chamber. It is characterized by being repeatedly subjected to a re-classification action.

As a classifier of the powder raw material, a flow straightening plate (52d) formed in an annular flat plate, and a raw material introduction hole having a predetermined diameter and arranged at a predetermined interval perpendicular to the flow straightening plate (52d). A plurality of rectifying plates (52a, 52b, 52c) formed in an annular flat plate having a plurality of
a, 52b, 52c, 52d) having an impeller-type classifier (51) having a classifying blade (53) radially arranged and fixed from the center of rotation to the outer peripheral direction. In a classifying apparatus in which fine powder is sucked and collected, and coarse powder is dropped and collected, a rotary disperser (48) is disposed above the impeller classifier (51). A raw material introduction section (42) is provided above the rotary disperser (48), and a gas introduction section (44, 4) for introducing gas in the circumferential direction around the rotary disperser (48).
5, 46, 47), and the impeller classifier (5
A gas introduction portion (54, 55, 56, 57) for introducing gas in the circumferential direction is formed on the outer periphery of 1), and the fine powder is sucked and conveyed below the center of the impeller classifier (51). A fine powder take-out part (60) is provided, and the impeller classifier (51) is provided.
A coarse powder collecting section (40b) formed below the outer peripheral portion of the section and separated from the fine powder extracting section (60) to collect and drop the coarse powder freely;
Is provided.

[0012] Further, as a classifier of the powder raw material,
The impeller classifier (51) and the rotary disperser (4)
8) rotating shafts (61a, 61b) for independently rotating
It is characterized by having. Further, as a classifier of the powder raw material, a dispersion chamber (43a) formed in a substantially cylindrical shape at the upper part of the casing (40), and a coaxially disposed below the dispersion chamber (43a) to form a substantially cylindrical shape. Classification room (4
3b) and a raw material input pipe (42) attached to the upper part of the dispersion chamber so that the raw material can be input from the outer peripheral side toward the central part side.
A spiral air introduction path (44) provided around the dispersion chamber (43a), and a spiral air introduction path (54) provided around the classification chamber (43b); A rotating shaft (41) disposed substantially coaxially with the chamber (43a) and the classifying chamber (43b); and the dispersion chamber (43a).
A guide vane (47) provided at a boundary between the air introduction passage (44) and the air introduction passage (44), and provided at a boundary between the classifying chamber (43b) and the air introduction passage (54). Guide vane (57) for rectifying the introduced air into a vortex
And a plurality of dispersing blades (49) attached to the rotating shaft (41), disposed in the dispersion chamber, formed in a truncated cone shape, and directed radially to the upper surface and fixed vertically. A dispersing rotator (4) for dispersing the introduced powdery raw material
8) and a plurality of rectifying plates (52a, 52b, 52c, 52d), which are attached to the lower end of the rotating shaft (41) and are arranged in the classifying chamber and are composed of a plurality of annular flat plates, are arranged at equal intervals. (52a, 52b, 52c, 52d), a plurality of classifying blades (53) are erected vertically and radially from the center of the current plate to the outer periphery, and the lowermost current plate (52d) is provided.
A plurality of raw material introduction holes (58a, 58b, 58) are arranged at equal intervals in the circumferential direction along the lower peripheral edge of the dispersion rotating body (48) except for
c), a classifying rotor (51) for classifying the powder material into fine powder and coarse powder, and a coarse powder collecting pipe (40b) connected below the peripheral end of the classifying chamber to drop and collect coarse powder. And a fine powder take-out pipe (60) that sucks and transports fine powder to the outside of the casing, which is disposed so as to penetrate the coarse powder collection pipe wall from directly below the center of the classification rotor.

[0013]

With the above construction, in the method of classifying powder raw materials, the powder raw materials are charged into the dispersion chamber from the upper portion of the casing, and the charged raw materials are applied with a mechanical force in a radial direction and a circumferential direction. Aerodynamic force is applied to the particles to disperse them.Then, they are introduced into the classifying chamber and classified by applying the mechanical force in the radial direction and the aerodynamic force in the centripetal direction. The powder is sucked and discharged from the center of the classification chamber through the fine powder outlet below the casing, and the classified coarse powder is repeatedly subjected to redispersion and reclassification at the periphery of the classification chamber, thereby blowing up the raw material. , The pressure loss is reduced, the input raw material is effectively dispersed, and then classified, whereby the fine powder can be classified reliably.

In the apparatus for classifying powder raw materials, FIG.
It will be described based on. In the apparatus for classifying powder raw materials shown in FIG. 1, a dispersion chamber (43a) is provided above the classification chamber (43b).
Is disposed, and a raw material charging section (42) is provided above the dispersion chamber (43a). The raw material introduced from the raw material introduction section (42) is mechanically subjected to centrifugal force by the rotary dispersion machine (48) inside the dispersion chamber (43a), and the gas introduction section (44, 45, 46). , 47) are aerodynamically dispersed by the gas introduced from the outer peripheral side toward the circumferential direction and are dispersed by the action of the force in the circumferential direction, and are classified through the raw material introduction holes (58a, 58b, 58c). (43b)
Will be introduced. In the classifying chamber (43b), a gas inlet (54, 55, 56, 57) to the classifying chamber (43b).
The gas introduced into the classifying chamber (43b) from the outer peripheral side in the circumferential direction merges with the gas introduced together with the classifying raw material from the dispersion chamber (43a) to form a plurality of rectifying plates formed in an annular flat plate. (52a, 52b, 52c, 52d), and the air is sucked downward in the center of the impeller type classifier (51) inside the classifying chamber, so that an airflow in the center direction is generated between the flow straightening plates. The classified raw material introduced into the classification chamber (43b) receives mechanical centrifugal force by the impeller classifier (51). The mechanical centrifugal force and the aerodynamic centripetal force due to the airflow toward the center are provided. Classified by Fine powder among the classified raw materials moves in the direction of the rotation axis of the impeller classifier (51), and is sucked and taken out from below the center through the fine powder take-out part (60), and coarse powder moves in the outer circumferential direction. However, after undergoing redispersion and reclassification by the air flowing from the guide vanes 57 provided on the outer peripheral portion of the impeller classifier (51), the air is collected via the coarse powder collection unit (40b). .

In the powder material classifier (FIG. 5), the impeller type classifier (51) is rotated by the rotating shaft (61a), and the rotary disperser (48) is rotated by the rotating shaft (61b). By being able to rotate independently of the car classifier (51), each can be rotated at the optimum rotation speed to effectively classify the effectively dispersed powder and improve classification efficiency. You will be able to do it.

Further, when the classification is performed by the classifier of the powder material, the raw material is supplied from above the classification rotor (51), and the fine powder is sucked and taken out from below the classification rotor (51). As a result, the pressure loss of the entirety is reduced, and the dispersion rotating body (48) is provided between the material inlet and the classifying rotor (51). Body (4
8) is sufficiently dispersed in the airflow introduced into the airflow, and the inflow air is converted into a vortex by the rectifying action of the guide vanes (47) around the dispersion chamber and the rotation of the dispersion blades.
Classifying rotor (51) to give sufficient rotation to raw material particles
And the wear of the members due to the wear is concentrated on the dispersion blades and the collision plate, thereby facilitating the repair.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. [Embodiment 1] FIG. 1 shows the configuration of a powder raw material classification apparatus according to Embodiment 1. A rotating shaft 41 is provided vertically at substantially the center of a cylindrical portion 40a formed on the upper portion of the casing 40. At the top of the casing, two raw material introduction pipes 42 are provided so as to sandwich the rotation shaft 41.

A dispersion chamber 43a is formed at the lower end of the raw material introduction pipe 42 in a cylindrical shape coaxial with the rotary shaft 41, and a classifying chamber 43b is formed at a lower portion thereof in a cylindrical shape coaxial with the rotary shaft 41. As shown in FIG. 2, a spiral air introduction path 44 is provided around the dispersion chamber 43a, and two large and small air introduction ports 45 are provided on circumferentially tangential extensions of the air introduction path 44 at positions opposite to each other. , 46 are provided and the air inlet 4
A guide vane 47 is provided at the boundary between the dispersion chamber 43 and the dispersion chamber 43 to rectify the air introduced from the air introduction ports 45 and 46 into the dispersion chamber 43 into a vortex, and to introduce the air into the air introduction ports 45 and 46.
Prevents particles from entering and depositing on the surface. Guide vane 47
Has a structure that can be adjusted to any angle.

At the lower part of the dispersion chamber, a frustoconical rotator 48 as a rotary disperser is attached to the rotary shaft 41, and at the upper part of the rotator, radially and vertically from the center of rotation toward the outer periphery. A plurality of dispersion blades 49 are fixed. In order to disperse the raw material most effectively and to minimize the wear of the dispersion blade 49, the inclination direction of the raw material introduction pipe 42 is directed to the rotation center of the dispersion blade 49. Further, a collision plate 50 is arranged on the entire periphery of the inner wall of the dispersion chamber 43.

A classifying rotor 51 as an impeller classifier is mounted on the rotating shaft 41 in the classifying chamber 43b.
The classifying rotor 51 includes a plurality of straightening plates 52a, 52b, 52c, and 52d formed of four horizontal annular flat plates, and radially and vertically provided between the straightening plates 52 from the rotation center of the classifying rotor toward the outer periphery. It is composed of a number of classifying blades 53, and the center of the classifying rotor is hollow.

As shown in FIG. 3, a spiral type air introduction passage 54 is provided around the classifying chamber 43b, and two large and small air introduction passages are provided on circumferentially tangential extensions of the air introduction passage 54 at positions opposite to each other. Inlet ports 55 and 56 are provided, and guide vanes 57 are provided at the boundary between the air inlet path 54 and the classifying chamber 43b.
Is provided to rectify the air introduced into the classifying chamber 43b from the air introduction ports 55 and 56 into a vortex, and to prevent particles from entering the air introduction ports 55 and 56 and prevent accumulation. The guide vane 57 has a structure that can be adjusted to an arbitrary angle. The air flowing through the guide vanes 57 is supplied to the classification chamber 4
Since the air is exhausted from the cavity in the center of the classification rotor in 3b,
A rotating airflow having a centripetal component is generated.

A plurality of holes 58a, 58b, 58c are formed in the rectifying plates 52a, 52b, 52c as raw material introduction holes at equal intervals on the circumference of the same diameter. Each hole 58a, 58
As shown in FIG. 4, the areas of b and 58c are the largest in the hole 58a provided in the uppermost rectifying plate 52a, then the hole 58b provided in the middle upper rectifying plate 52b, and the middle lower rectifying plate 52b. It narrows in the order of the holes 58c provided in the plate 52c, and is not opened in the lowermost rectifying plate 52d. Immediately below the gap between the outer periphery of the bottom surface of the dispersion rotating body 48 and the guide vanes 47 around the dispersion chamber, a hole 58a provided in the uppermost straightening plate 52a of the classifying rotor 51 is located.

A conical portion 40b is formed in the lower part of the casing as a coarse powder collecting pipe, and a coarse powder collecting port 59 is provided in the lowermost part thereof. A fine powder take-out tube 60 is attached vertically downward from just below the center of the classifying rotor 51, and is bent in the middle to take out fine powder from the side surface of the conical portion 40b of the casing 40 to the outside of the classifier. Fine powder extraction tube 60
Has a diameter substantially the same as that of the cavity provided at the center of the classifying rotor 51, and is connected to a bag filter (not shown) outside the classifier. The air that carries the fine powder is
The air is sucked from the center of the classifying rotor of the classifying chamber 43b toward the bag filter, separated from the fine powder by the bag filter, and exhausted to the outside after separating the fine powder. The configuration outside the classifier includes a bag filter and has the same configuration as the conventional one.

In the classifier according to the first embodiment having the above-described structure, the powder raw material is supplied from the two raw material introduction pipes 42 at the top of the casing to the inside of the dispersion chamber 43a where the dispersion blades 49 are provided. It is thrown in and is uniformly dispersed in the airflow introduced into the dispersion chamber 43a from the air introduction path 44 via the guide vanes 47 by the centrifugal force of the dispersion blades 49 and the repulsive action of the collision plate 50. At this time, since the air introduced into the dispersion chamber 43a is converted into a vortex by the rectifying action of the guide vanes 47 around the dispersion chamber and the rotation of the dispersion blade 49,
The powder raw material dispersed in the air stream is given a sufficient rotational motion.

The powdery raw material dispersed in the vortex flow descends while rotating in the gap formed by the inclined side surface of the rotary flap 48 having a frustoconical shape and fixing the dispersion blades 49 and the guide vane 47. , The rectifying plate 52a at the top of the classifying rotor
Rotor 51 through a plurality of holes 58a opened in
Introduced within. Each rectifying plate 52a, 5 of the classifying rotor 51
Holes 58a, 58b, 58c opened in 2b, 52c
Is narrowed to the lower stage, so that the airflow containing the raw material is evenly distributed among the four current plates 52a, 52b, 52c, 52d.

Along with the air containing the classification material and introduced into the classification rotor 51 from the dispersion chamber 43a, the air flowing inward from the outer periphery of the classification rotor 51 through the guide vanes 57 from the air introduction passage 54 through the air introduction passage 54 is classified. Acts on powdered raw material as air. The classification is performed on the circumference where the holes 58a, 58b, and 58c provided in the flow straightening plates 52a, 52b, and 52c are opened. On this circumference, the centrifugal force given by the classification blade and the centripetal force due to the air flow are reduced. The particle diameter to be balanced becomes the classification diameter.Particles having a larger particle diameter than this classification diameter are superior in centrifugal force and are discharged as coarse powder from the outer periphery of the classification rotor.Particles having a smaller particle diameter than the classification diameter are classified together with the classification air into the classification rotor. It is conveyed by suction to the center.

The classified air containing the classified fine powder is conveyed from the classification rotor 51 to the bag filter outside the classification device via the fine powder take-out pipe 60, and the air and the fine powder are separated by the bag filter. On the other hand, the classification rotor 51
The coarse powder particles discharged from the outer periphery of the metal powder are subjected to re-dispersion and re-classification by the air flowing from the guide vanes 57, and the fine powder particles having been deagglomerated are sucked into the classification rotor 51 again. The remaining coarse particles fall down in the space between the classifying rotor 51 and the guide vanes 57, slide down along the inner wall surface of the conical portion 40b of the casing 40, and reach the coarse powder collecting port 59 at the lowermost portion of the casing.

[Embodiment 2] Embodiment 2 differs from Embodiment 1 in that the rotating shaft 61 is concentric double shafts 61a and 61b as shown in FIG. The double shaft is composed of an inner shaft 61a and an outer shaft 61b, and can be independently rotated. The inner shaft 61a transmits the driving force transmitted via the gear 62 to the classifying rotor 51, and the outer rotating shaft 61b
3 so that the driving force transmitted via the transmission 3 can be transmitted to the rotating body 48 for dispersion.

With this configuration, the dispersion blades 49 and the classifying rotor 51 can be independently rotated. By increasing the rotation speed of the dispersion blades 49 more than the classifying rotor 51, strong dispersion can be performed. it can.

[0030]

As described above, in the classification method according to the present invention,
The powdered raw material is put into the dispersion chamber from the upper part of the casing, and the raw material put in the dispersion chamber can be dispersed by applying the mechanical force in the radial direction and the aerodynamic force in the circumferential direction, After that, the dispersed raw materials are introduced into the classifying chamber, and classified by applying a mechanical force in the radial direction and an aerodynamic force in the centripetal direction in the classifying chamber. It can be sucked from the central part, discharged through the discharge path below the casing and collected, and the classified coarse powder can be repeatedly subjected to re-dispersion and re-classification at the periphery of the classification chamber. By doing
Pressure loss can be reduced by eliminating the necessity of blowing up the raw material, classification can be performed after the input raw material is effectively dispersed, fine powder can be collected efficiently, and damage to the equipment used for classification can be prevented. It is not necessary to reduce the operating rate by reducing the operating rate.

In addition, the powder material classifying apparatus is conventionally used for performing a classification process under a condition of a high powder concentration that deteriorates the performance, or a classification process of a powder having a strong adhesion or a powder having a high abrasion. Even if there is, the supply of the raw material is performed after being dispersed from above the impeller classifier (51), and the fine powder is sucked and taken out from below the center of the impeller classifier (51). Thereby, the whole pressure loss can be reduced, and the dispersion blade (48) provided between the raw material introduction section (42) and the impeller type classifier (51) can rotate the raw material at high speed. Can be sufficiently dispersed in the airflow introduced into the rotary disperser (48), and the gas introduction portions (44, 45, 46, 4
By converting the inflow air into a vortex by the rectifying action of 7) and the rotational force of the rotary disperser (48), the material particles are sufficiently rotated to reduce the wear of the impeller classifier (51). Then, the repair of the member is facilitated by concentrating the wear of the member due to the wear on the member which is easy to replace.

Further, unlike the conventional classification apparatus for large processing, classification is performed in a completely forced vortex, so that the classification field is stable. , Classification conditions are kept stable, and classification conditions can be easily set. Further, the classification accuracy can be adjusted according to the particle size configuration of the fine powder to be obtained by increasing or decreasing both the flow rate of the introduced gas and the rotation speed of the impeller classifier (51) while maintaining the balance of the classification diameter. There is also an effect that it can be easily performed.

In the powder material classifying apparatus, the rotary disperser (48) and the impeller classifier (51) are independently rotated by the rotary shaft (61a) and the rotary shaft (61b). Can be rotated at the optimal number of revolutions, can be dispersed powerfully and effectively, and then can be classified better, improving the classification efficiency Can be.

Further, when the classification of the powder material is performed by the classification device, the classification process under the condition of high powder concentration,
Alternatively, even in the case of performing a classification process on a powder having a strong adhesive property or a powder having a high abrasion property, supply of the raw material is performed using a classification rotor (5
A rotating body (48) having a structure in which fine powder is taken out from below the classifying rotor (51), and has a dispersion blade (49) for dispersion between the raw material inlet and the classifying rotor (51); The rectifying action of the guide vanes (47) around the dispersion chamber and the rotation of the dispersion blades convert the inflow air into a vortex, thereby reducing the overall pressure loss required for classification and rotating the powder material at high speed. While being sufficiently dispersed by the centrifugal force of the dispersion blades and the introduced airflow, it is possible to give sufficient rotation to the raw material particles,
Moreover, the wear of the classifying rotor (51) can be reduced, and the wear of the member due to the wear can be concentrated on the dispersion blade and the collision plate, so that the repair can be facilitated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a classification device according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG. 1 (at the position of the dispersion blade).

FIG. 3 is a sectional view taken along the line III-III of FIG. 1 (at a classifying rotor interruption position).

FIG. 4 is a sectional view taken along the line IV-IV (of the classifying rotor) of FIG. 1;

FIG. 5 is a longitudinal sectional view showing a second embodiment of the classification device according to the present invention.

FIG. 6 is a longitudinal sectional view showing a conventional classification device.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6 (at a middle position of the current plate).

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 6 (at a position below the current plate).

[Explanation of symbols]

Reference Signs List 40 Casing 40a Cylindrical part (of casing) 40b Conical part (of casing) (coarse powder collecting part) 41 Rotating shaft 42 Raw material input pipe (raw material introducing part) 43a Dispersion chamber 43b Classification chamber 44 Air introduction passage (vortex) to dispersion chamber (Gas introduction part) 45,46 Air introduction port to dispersion chamber (Gas introduction part) 47 Dispersion chamber guide vane (Gas introduction part) 48 Dispersion rotating body (Rotary disperser) 49 Dispersion blade 50 Collision plate 51 Classification rotor (impeller type classifier) 52 Rectifier plate 53 Classification blade 54 Air introduction path (swirl path) to classifier (gas inlet) 55,56 Air inlet to classifier (gas inlet) 57 Classifier guide Vane (gas inlet) 58a, 58b, 58c Hole (raw material inlet) 59 Coarse powder outlet 60 Fine powder outlet (fine powder outlet)

Claims (4)

(57) [Claims] 1. A aerodynamics of the powdered material projecting <br/> incoming city from the casing top in the dispersion chamber, the circumferential direction together with the application of mechanical mechanical force in the radial direction batch inputted in the dispersion chamber Disperse by applying a suitable force , put the dispersed raw material into the classification room,
In the classifying chamber , a mechanical force in a radial direction and an aerodynamic force in a centripetal direction are applied for classification, and the classified fine powder is discharged from a central portion of the classifying chamber to a fine powder outlet below a casing. The classified coarse powder is sucked and discharged through the
A method for classifying a powder raw material, wherein a redispersion and a reclassification action are repeatedly performed in a peripheral portion . 2. A current plate (52d) formed in an annular flat plate.
And a plurality of rectifying plates (52a, 52b, 5) formed in an annular flat plate which is arranged at a predetermined interval in the vertical direction with respect to the rectifying plate (52d) and has a plurality of raw material introduction holes having a predetermined diameter.
2c) and each current plate (52a, 52b, 52c, 52)
(d) an impeller-type classifier (5) having a classifying blade (53) arranged and fixed radially from the center of rotation in the outer circumferential direction.
1) , the powder material is classified into fine powder and coarse powder,
So as to collect the powder by sucking and dropping the coarse powder
In the classifier, a rotary disperser (4) is provided above the impeller classifier (51).
8), a raw material introduction section (42) is provided above the rotary dispersion machine (48), and a gas introduction section for introducing a gas in the circumferential direction to the outer periphery of the rotary dispersion machine (48). (44,
45, 46, 47) and the impeller classifier (5
A gas introduction portion (54, 55, 56, 57) for introducing gas in the circumferential direction is formed on the outer periphery of 1), and the fine powder is sucked and conveyed below the center of the impeller classifier (51). A fine powder take-out part (60) is provided, and the impeller classifier (51) is provided.
Formed below the outer peripheral portion of the surface, separated from the fine powder take-out portion (60)
Coarse powder collection unit (40b) for collecting and falling free coarse powder
A classification device for powder raw materials, characterized by comprising: 3. A rotating shaft (61) for independently rotating the impeller classifier (51) and the rotary disperser (48).
3. The classification apparatus for powdery raw materials according to claim 2, further comprising: a, 61b). 4. A dispersion chamber (43a) formed in a substantially cylindrical shape at an upper part of a casing (40), and a classifying chamber (43) arranged coaxially below the dispersion chamber (43a) and formed in a substantially cylindrical shape. 43b), a raw material introduction pipe (42) attached to the upper part of the dispersion chamber so that the raw material can be introduced from the outer peripheral side to the central part side, and a spiral air introduction provided around the dispersion chamber (43a). A channel (44), an air introduction channel (54) provided in a spiral shape around the classifying chamber (43b), and a substantially coaxial arrangement with the dispersion chamber (43a) and the classifying chamber (43b). rotation axis (4 1), wherein the dispersion chamber and (43a) and the guide vanes for rectifying air introduction path introducing air provided at a boundary between the (44) to the vortex (47), the classification chamber (43 b) And a guide provided at the boundary between A guide vane (57) for rectifying air into a vortex; a plurality of vanes attached to the rotating shaft (41) and arranged in a dispersion chamber, formed in a truncated cone shape, directed radially to the upper surface, and fixed vertically. A number of dispersing blades (49),
Rotating body for dispersion for dispersing the introduced powder material (48)
And a rectifying plate (52a, 52a, which is attached to the lower end of the rotating shaft (41) and is disposed in the classifying chamber, and is composed of a plurality of annular flat plates.
52b, 52c, 52d) are juxtaposed at equal intervals, and a plurality of classifying blades (5) are arranged radially and vertically from the center of the current plate to the outer periphery between the current plates (52a, 52b, 52c, 52d).
3), and the dispersion rotating body (4) is removed except for the lowermost current plate (52d).
8) A plurality of raw material introduction holes (58a, 58b, 58c) are formed at equal intervals in the circumferential direction along the lower end periphery of the classifying rotor (5) for classifying the powder raw material into fine powder and coarse powder.
1), a coarse powder collecting pipe (40b) connected below the peripheral end of the classifying chamber to drop and collect coarse powder, and a casing externally arranged through a wall of the coarse powder collecting pipe just below the center of the classifying rotor. And a fine powder take-out pipe (60) for sucking and transporting fine powder on a side thereof.