JPH07328545A - Granule classifier - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a classifier for powder particles that can efficiently classify powder particles into three stages in one device and can recover at least medium particles in one step. [Structure] A first cylindrical container 1 having a raw material introduction pipe 4 and an air introduction part 1a for receiving air in a swirling flow in the upper part, and a lower part of the first cylindrical container 1 surrounded by a fine powder flow discharge part in the upper part. 2c
A second cylindrical container 2 having a medium particle flow discharge part 2d in the middle part and a coarse particle outlet 2b in the lower end part, and a cyclone device 3 in the lower part of the second cylindrical container 2 And a reverse rectification mechanism 6 composed of a collision plate 7 and a reverse rectification plate 8 for reversing the swirling flow to make an upward flow in the lower part of the first cylindrical container 1 and arranging it to descend. The particles are collected from the coarse particle outlet 2b, the upward flow is diverted, the fine powder particle flow is discharged from the fine powder flow discharge portion 2c, and the medium particle flow is introduced into the cyclone device 3 from the medium particle flow discharge portion 2d. The medium particles were collected from the medium particle outlet 3a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for placing powder particles on an air flow and classifying them by utilizing the action of centrifugal force or collision.

[0002]

2. Description of the Related Art Dry type devices for classifying a large amount of grain powders such as grain powders into groups having different particle sizes by using a gas flow such as air include those utilizing gravity, those utilizing inertia, and centrifugal force. There are various things that use. For example, the airflow classifying device B as shown in FIG. 5 mainly uses the inertial collision effect, and the lower part of the rectangular cylindrical container 30 having a relatively long widthwise direction with respect to the vertical direction (the lateral direction in the drawing). , A conduit 31 having an equal width is attached so that its outlet 31a is in a horizontal direction, and when an air flow containing powder and granules is supplied from the conduit 31, the air flow reaches the outlet 31a of the conduit 31. While rising along the facing inner wall 30a and being discharged from the discharge conduit 32, during this time, the granular material having a large particle diameter contained in the air flow collides with the inner wall 30a inertially and separates from the air flow, and descends along the inner wall. Since the powder particles having a small particle size are discharged from the discharge conduit 32 along with the air flow, the air flow is discharged from the discharge port 33 provided at the lower end portion, so that this air flow is further reduced by another gravity settling device, cyclone device or Bagfill So that to recover the like to remaining granular material is introduced into the chromatography and the like.

Although not shown, the basket-shaped rotor is rotated at a high speed or the horizontal blades are rotated at a high speed to supply the granular material, a centrifugal force is applied to the granular material, and an air flow is generated in the container. An apparatus and the like for classifying by supplying are also known.

[0004]

However, the powder particles that are practically used have a suitable particle size range, and the coarse particles and the fine powder particles are separated and removed from the raw material powder particles to obtain the medium particle particles. It is very often the case that the conventional classifying device collects and uses the powder in two types, one with a large particle size and the other with a small particle size in a single device, as described above. In order to classify the powder into three stages according to the particle size, it has conventionally been necessary to arrange at least two such classifiers in series for continuous treatment. However, there was a disadvantage in terms of economy. Further, in the above-described device having power and having a movable part, similarly, there is a problem that a single device cannot perform classification in three stages, is not suitable for large-scale processing, and has many malfunctions in the movable part. It was

In view of such a situation, the present invention is capable of efficiently classifying the particle size into three stages in one device, and at least the intermediate particle can be recovered in one step, and The object of the present invention is to provide a classifier for powder and granular material, which has no malfunction and can be processed in large quantities.

[0006]

In order to achieve the above object, the present invention provides a first cylindrical container having a raw material granular material introduction port and an air introduction port for receiving air in a swirling flow in the upper part, A second cylindrical container surrounding the lower part of the first cylindrical container, having a fine powder flow discharge port at the upper part, a medium particle flow discharge port at the middle part, and a coarse particle outlet at the lower end part; 2 is a powdery or granular material classifying device comprising a cyclone device combined with the lower part of the cylindrical container, wherein a collision plate for colliding the swirl flow with the lower end of the first cylindrical container and a direction of the swirl flow are An inversion rectification mechanism is provided in combination with an inversion rectification plate that inverts to form an upward swirl flow, and the cyclone device has an intermediate particle flow inlet port connected to the intermediate particle flow outlet port at the upper part thereof. , The first cylinder having a middle particle take-out opening in the lower part and opening in the central part and penetrating the top part It is equipped with a central exhaust pipe that opens at the bottom of the container, and puts the granular material on the air flow to make a swirl flow, and separates the coarse particles by inertial collision at the collision plate of the reversal rectification mechanism to remove the coarse particles. Collected from the outlet, the upward swirl flow is diverted to pass through the fine powder flow discharge port and the medium particle flow discharge port, and medium particles are separated in the cyclone device and collected from the medium particle outlet, A granular material classifying device for leading out an air flow for separating coarse particles and an air flow for separating medium particles from the fine powder flow outlet, and a hood having an open top at the lower part of the first cylindrical container. A granular material classifying device which is provided with a central hole penetrating the reversing rectification mechanism and circulates the downward divided air from the collision plate portion of the reversal rectification mechanism into the first cylindrical container; In addition, the first cylindrical body above the reverse rectifying plate A cone body which is narrowed upward in the flow path of the upward swirl flow formed between the outer wall of the vessel and the inner wall of the second cylindrical container to increase the centrifugal force of the internal particles of the upward swirl flow. The granular material classifying device further comprises a rectifying plate mechanism for increasing the centrifugal force of the granular particles in the swirling air flow at the device side opening of the cyclone device. Furthermore, the present invention proposes a granular material classifying device in which the upper end of the central exhaust pipe of the cyclone device is opened into the first cylindrical container.

[0007]

[Function] When the raw material granules to be classified are introduced from the raw material granule introduction port of the first cylindrical container and air is supplied to the air introduction port, the granules ride on the air to form a swirling flow. It descends while swirling, reaches the lower part of the first cylindrical container, approaches the collision plate of the reversing rectification mechanism, and reverses, and reverses the flow direction by the reversing rectification plate, but coarse particles inertially collide with the collision plate. Since it falls effectively, the coarse particles in the raw material granular material can be recovered from the coarse particle outlet at the lower end of the second cylindrical container. The granular material flow that has left the reverse rectifying plate and has become an upward swirling flow is divided into a medium particle flow and a fine powder particle flow depending on the mass of the granular material in the upper part of the first cylindrical container, and is mostly Since the fine powder particle flow due to the air flow of is discharged from the fine powder flow discharge port at the top, the fine powder particles in the raw material granular material are connected to this fine powder flow discharge port by a suitable bag filter device or another cyclone device. Can be collected by the collection mechanism. The air flow containing medium particles is supplied to the cyclone device from the medium particle outflow port of the second cylindrical container, becomes a swirling flow in this cyclone device, and the centrifugal force causes the medium particles to settle along the inner wall of the cyclone device. Medium particles in the raw material granules can be collected from the medium particle outlet at the lower end of the cyclone device. The air flow containing the fine powder particles after separating the medium particles reaches the lower part of the first cylindrical container through the central exhaust pipe and joins with the raw material powder / granular material flow to collect the fine powder. In addition,
Since there is no moving part in this powdery or granular material classifying device, there is no failure of the device or the like which hinders the operation.

By disposing a hood in the lower part of the first cylindrical container and providing a center hole in the reversing rectification mechanism, downward diverted air is generated from the collision plate portion at the outer peripheral portion of the reversal rectification mechanism, Circulate the medium particles mixed in the descending coarse particles first
The recovery rate of the medium particles can be increased by returning the particles to the cylindrical container.

By providing the cone body in the flow path of the upward swirling flow of the outer wall of the first cylindrical container, the centrifugal force of the particles in the upward swirling flow can be increased, and after the escape of the cone body. It is possible to enhance the guidance of the particles to the medium particle flow outlet and increase the recovery rate of the medium particles.

By providing a straightening plate mechanism at the outlet of the medium particle flow inlet in the cyclone device, the centrifugal force of the medium particles can be increased, the separation effect of the medium particles in the cyclone device can be enhanced, and the recovery rate can be increased. it can.

Further, the central exhaust pipe of the cyclone device is
By opening in the first cylindrical container, the amount of air in the first cylindrical container is increased, the aerodynamic force in the reverse rectifying mechanism is strengthened, the inertial collision effect on the collision plate is enhanced, and coarse particles and agglomerated particles are destroyed. For example, the recovery rate of medium particles can be increased.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The powdery or granular material classifying apparatus of the present invention will be described below with reference to the drawings of the embodiments. FIG. 1 is a side sectional view of a powdery or granular material classifying apparatus of the present invention.

The powdery or granular material classifying apparatus A is roughly composed of a first cylindrical container 1, a second cylindrical container 2 and a cyclone device 3. A raw material introducing pipe 4 is located in the center of the top of the first cylindrical container 1 to form a supply port for the raw material powder or granular material. The supply device is connected. A conical distributor 5 is arranged below the raw material introducing pipe 4 inside the first cylindrical container 1 so that the powder particles supplied are evenly distributed around the lower part inside the first cylindrical container 1. I am doing it. In addition, a tubular air introducing portion 1a is formed in the tangential direction on the upper part of the first cylindrical container 1 and is connected to a blower (not shown), and the air flow introduced from this air introducing portion 1a is The inside of the first cylindrical container 1 descends while swirling around the raw material introducing pipe 4 to form a swirling flow around the lower distributor 5 in which the powder particles are entrained.

The second cylindrical container 2 is formed into a large-diameter cylindrical body so that the upper part thereof surrounds the first cylindrical container 1, and the lower part of the second cylindrical container 2 is narrowed down into a hopper shape so that the chute portion is in an obliquely descending state. 2a is provided, and a coarse particle outlet 2b is formed at the lower end thereof. Further, a tubular fine powder flow discharge portion 2c is formed in the tangential direction on the upper part of the second cylindrical container 2 so as to be connected to a fine powder collecting device such as a bag filter or a cyclone (not shown). Similarly, a small-diameter tubular medium particle flow discharge portion 2d is formed in the portion in the tangential direction. Then, the reversing rectifying mechanism 6 including the collision plate 7 and the reversing rectifying plate 8 is attached in contact with the lower end portion of the first cylindrical container 1.

As shown in the exploded perspective view of FIG. 2, the inversion rectifying mechanism 6 includes three accelerating plates 9 each having an arc-shaped partition plate having a collision plate 7 fixed to its end, and the collision plate 7 portion being equal. A bottom plate 11 having a central hole 10 is provided at the lower edge of the accelerating plate 9 so that the spaces are radially arranged in a radial direction.
In addition, a round frame-shaped inner cylinder 13 having three openings 12 formed equally on the lower edge is combined so as to cover the accelerating plate 9 from above. At this time, the collision plate 7 part protrudes out of the inner cylinder 13, and the opening 12 of the inner cylinder 13 is arranged so as to be adjacent to the collision plate 7. On the outer circumference of the inner cylinder 13 and above the collision plate 7, three reverse rectifying plates 8 are arranged. One end 8a of each inversion straightening plate 8 is bent downward in the circumferential direction so that the leading end portion overlaps the horizontal end of the adjacent inversion straightening plate 8 to open the outlet port 14. The inner cylinder 13 is fixed to the lower end of the first cylindrical container 1 at its upper edge,
The outer edge of each of the collision plate 7 and the reverse rectifying plate 8 abuts on the inner wall of the second cylindrical container 2.

That is, in the reversing flow rectifying mechanism 6, the air flow descending while swirling in the circumscribing first cylindrical container 1 is indicated by an arrow in the perspective view of FIG. The flow is accelerated along the accelerating plate 9 of No. 6 and discharged from the opening 12 of the inner cylinder 13, blocked by the collision plate 7 and reversed, and led out from the outlet 14 of the reversing rectifying plate 8 as a swirling flow in the opposite direction. Being lifted. At the time of this reversal, the large-sized coarse particles in the air flow collide with the collision plate 7 due to the inertial force, and separate from the air flow and descend. Further, as shown in FIG. 1, the air flow passage above the reversal straightening plate 8, that is, between the outer wall of the first cylindrical container 1 and the inner wall of the second cylindrical container 2 is narrowed upward. A cone body 15 is provided. The air flow from the reverse rectifying plate 8 is designed to rise while swirling in the cone body 15. Since the air flow generates a centrifugal force when the swirling diameter is small, the air flow swirls in the cone body 15 to increase the centrifugal force of the granules and is guided to the upper portion in the second cylindrical container 2.

Under the reverse rectifying mechanism 6, hoods 16 and 17 having a top opening are arranged in two stages, and an air flow branched downward from the collision plate 7 portion forms a central hole 10 in the bottom plate 11. It escapes and rises so as to join the swirl flow in the first cylindrical container 1, and the medium particles mixed in the coarse particles are trapped during the fall and are returned to the upper part in a circulating manner.

Below the hoods 16 and 17, the cyclone device 3 is arranged. The cyclone device 3 has an upper part incorporated into the second cylindrical container 2. The medium particle flow introduction pipe 18 provided at the upper part is connected to the medium particle flow discharge part 2d of the second cylindrical container 2 by the intermediate conduit 19, and the medium particle flow is introduced into the cyclone device in a swirling flow. As shown in FIG. 4, the opening portion of the middle particle flow introduction pipe 18 inside the cyclone device 3 is formed in the acceleration rectification mechanism. That is, the central exhaust pipe 20 arranged in the center of the device
4 straightening vanes 21 are equally distributed in a swirl shape around the circumference of the base plate, a bottom plate 22 is attached, and the air flow swirlingly introduced from the medium particle flow introducing pipe 18 descends by the straightening vanes 21. Meanwhile, the centrifugal force of the particles is strengthened so that the particles are introduced into the cyclone device 3.

Further, the central exhaust pipe 20 arranged on the central axis of the cyclone device 3 has a lower end opened to a substantially central portion of the cyclone device 3, and an upper end of the central exhaust pipe 20 inside the second cylindrical container 2. It is opened at the lower portion of the cylindrical container 1. That is, the swirling airflow that swirls in the cyclone device 3 and causes the middle particles to descend along the inner wall rises in the central exhaust pipe 20 and passes from the upper end opening thereof through the central hole 10 of the bottom plate 11 to the first hole.
It is introduced into the cylindrical container 1 and merges with the raw material powder flow. The lower half of the cyclone device 3 is located outside the second cylindrical container 2 and has a medium particle outlet 3a at its lower end. The central exhaust pipe 20 may be extended so that its upper end opens into the first cylindrical container 1. As a result, the amount of air in the first cylindrical container 1 is increased, the aerodynamic force against the reverse rectifying mechanism 6 is increased, and the collision rate of the coarse particles and the agglomerated particles on the collision plate 7 is destroyed. Can be expected to improve.

In the powdery or granular material classifying apparatus A of the present invention constructed as described above, the raw material powdery particles introduced from the raw material introducing pipe 4 are air-introducing portion 1a as shown by an arrow indicating an air flow. A centrifugal force is applied by riding on the clockwise swirling flow of the air introduced from, and reaches the lower portion in the first cylindrical container 1. Here, the powdery particles inertially collide with the collision plate 7 of the inversion rectifying mechanism 6 along the inner wall of the second cylindrical container 2 with the maximum centrifugal force, and the air flow is inverted. The separation effect from the air flow due to the inertial collision of the particles associated with the rapid reversal of the air flow from right to left is large,
The coarse particles fall and the agglomerated powder collapses. Then, the falling coarse particles descend along the inner wall of the second cylindrical container 2 and are collected from the coarse particle outlet 2b via the chute portion 2a.

On the other hand, the air flow is led out as a counterclockwise swirling flow from the outlet 14 by the reversing straightening plate 8 and rises up the inner wall of the cone body 15. That is, the particles having a size equal to or smaller than the medium particles pass through the reversal rectifying plate 8 together with the flow of the air, and ascend while rotating on the inner wall of the cone body 15, reach the tip of the cone body 15, and are squeezed The medium particles given the maximum centrifugal force commensurate with the radius of the body tip are the medium particle flow discharge portion 2d.
It flows out together with the split air. At this time, the fine powder particles are
The air is discharged together with most of the air from the fine powder flow discharging portion 2c, and is introduced into a collecting facility such as a bag filter in a subsequent process to be collected.

The medium particles from the medium particle flow discharge portion 2d are given a maximum centrifugal force from the medium particle flow introduction pipe 18 of the cyclone device 3 by the flow straightening plate 21 via the intermediate conduit 19 and the cyclone device 3 is supplied. It flows into the inside, separates from the air, descends along the inner wall, and is collected from the medium particle outlet 3a. Here, fine powder particles are still mixed in the air flow from which the medium particles have been separated, but this air flow reaches the lower portion of the first cylindrical container 1 by the central exhaust pipe 20 and passes through the hoods 16 and 17. As a result, it rises and joins the air flow containing the raw material particles in the first cylindrical container 1.

[0023]

As is apparent from the above description, the device of the present invention is of the air flow type which collects particles by making the granular material a swirl flow and effectively combining centrifugal force, inertial collision and gravity settling. Since it is a classifying device, it is possible to efficiently classify powder particles having three stages of particle diameters in one device having no dynamic mechanism, and it is possible to obtain the effect that the medium particles can be separately collected in one step. Further, in the powdery or granular material classifying apparatus of the present invention, since there is no moving part, there is no failure of parts or equipment that hinders the operation, and it is possible to continuously process a large amount of powdery or granular material.

[Brief description of drawings]

FIG. 1 is a side sectional view of a powdery or granular material classifying device of the present invention.

FIG. 2 is an exploded perspective view showing an inversion rectifying mechanism in the powder or granular material classifying apparatus of FIG.

FIG. 3 is a perspective view of the reverse rectifying mechanism of FIG.

FIG. 4 is a partially cutaway perspective view showing a current plate in the cyclone device of the powder / particle classifier of FIG. 1.

FIG. 5 is a side sectional view of a conventional airflow classifier.

[Explanation of symbols]

 A powder and granular material classifying apparatus 1 first cylindrical container 1a air introduction section 2 second cylindrical container 2a chute section 2b coarse particle outlet 2c fine powder discharge section 2d medium particle flow discharge section 3 cyclone device 3a medium particle collection Outlet 4 Raw material introduction pipe 6 Inversion rectification mechanism 7 Collision plate 8 Inversion rectification plate 9 Accelerator plate 10 Central hole 11 Bottom plate 12 Opening 13 Inner cylinder 14 Outlet port 15 Cone body 16 Hood 17 Hood 18 Medium particle flow introduction pipe 19 Intermediate conduit 20 Central exhaust pipe 21 Straightening plate 22 Bottom plate

Claims (5)

[Claims] 1. A first cylindrical container having a raw material powder and granules introduction port and an air introduction port for receiving air in a swirling flow in an upper part, and a lower part of the first cylindrical container is surrounded and a fine powder flow discharge is provided in an upper part. Powder comprising a second cylindrical container having an outlet, a middle particle flow outlet in the middle, and a coarse particle outlet at the lower end, and a cyclone device combined with the lower part of the second cylindrical container A granular material classifying apparatus, in which a collision plate for colliding the swirl flow with the lower end portion of the first cylindrical container and a reversal straightening plate for reversing the direction of the swirl flow to make an upward swirl flow are combined. An inversion rectifying mechanism is provided, and the cyclone device has a medium particle flow inlet port connected to the medium particle flow outlet port in the upper part and a medium particle outlet port in the lower part, and has an opening in the central part and a top part. A central exhaust pipe that penetrates through and opens at the bottom of the first cylindrical container. On the air flow to make a swirl flow, and the coarse particles are separated by the inertial collision in the collision plate of the reversal rectification mechanism and recovered from the coarse particle outlet, and the upward swirl flow is diverted to discharge the fine powder flow. Pass the outlet and the medium particle flow outlet, separate the medium particles in the cyclone device and collect from the medium particle outlet, the air stream separating the coarse particles and the air stream separating the medium particles are the fine powder. A powdery or granular material classifying device characterized by being led out from a flow outlet. 2. A hood having an open top is provided in a lower portion of the first cylindrical container, a central hole is provided through the reversing rectification mechanism, and a hood is provided below the collision plate portion of the reversal rectification mechanism. The powdery or granular material classifying apparatus according to claim 1, wherein counterflow air is circulated in the first cylindrical container. 3. An upward swirl flow path formed between the outer wall of the first cylindrical container and the inner wall of the second cylindrical container above the reverse rectifying plate, in the upward direction. The powdery or granular material classifying device according to claim 1 or 2, further comprising a cone body which is narrowed to increase a centrifugal force of the granular material in the upward swirling flow. 4. The cyclone device is characterized in that a flow straightening plate mechanism for increasing a centrifugal force of particles in the swirling air flow is provided at a device side opening of the medium particle flow introduction port. Powder and granular material classifier. 5. The powdery or granular material classification device according to claim 1, wherein an upper end of a central exhaust pipe of the cyclone device is opened in the first cylindrical container.