TW201906669A - Powder classification device and classification system - Google Patents

Abstract

Provided are a classification device and a classification system that simply classify a powder such as fly ash. The present invention is provided with an original powder discharge part 6 that discharges an original powder together with a gas, and a suction part 4 that is disposed opposite to the original powder discharge part 6 at a position spaced apart from the original powder discharge part 6 and that sucks in a part of the gas and the original powder, wherein: the original powder discharge part 6 has a rotation portion 61 that rotates the original powder and the gas. The present invention is also provided with a housing part 2 that houses inside thereof the original powder discharge part 6 and the suction part 4 and encircles the outer peripheries thereof, and a discharge conveyance pipe that has an intake port for taking in the original powder present in the lower part of the storage part 2, together with the gas, and that sends out the taken original powder and gas from the intake port to the original powder discharge part 6.

Description

Powder classification device and classification system

The invention relates to a powder classification device and a classification system.

Previously, the industry has proposed a classification device for classifying powder into particles of a size suitable for use. As one of such classification devices, the industry has proposed a classification machine that performs classification by using a rotary centrifugal force derived from a classification rotor (see Patent Document 1). In this classifier, the introduction direction of the classification gas is opposite to the rotation direction of the classification rotor, and it is opposite to the previous direction. It has been documented in this document that a large separation force can be obtained at the entrance of the rotating blades of the classifying rotor by a sharp change in the flow direction, and more accurate classification can be performed with a small number of revolutions.

Moreover, the industry has proposed a classifier for classifying powder to be supplied to the outside of the classifying rotor and guiding the powder to the inside of the classifying rotor based on the relationship between centrifugal force and centripetal force (see Patent Document 2). . This classifier is characterized in that each of the rotating blades of the classifying rotor is arranged to be inclined relative to the supporting member so that the supporting member side of one side is closer to the turning direction than the supporting member side of the other. It has been documented in this document that the separation performance can be improved without increasing the number of revolutions of the classified rotor. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2001-353473 [Patent Document 2] Japanese Patent Laid-Open No. 2005-342556

[Problems Solved by Invention]

However, according to a classifier using a classifying rotor, in order to ensure the classifying performance, the classifying roller must have a mechanical strength and a driving power to rotate it with a certain number of revolutions.

The invention in this case was developed in light of the above problems, and its purpose is to provide a classification device and a classification system that classify powders with high accuracy with a simple structure. [Means to solve the problem]

A feature of the invention of the present invention is a classifying device comprising: a raw powder supply pipe during processing, which carries the raw powder in an air stream, and a raw powder discharge section, which is connected above the raw powder supply pipe in the above processing and feeds the raw powder from above the opening. The powder is released together with the gas; the suction part is arranged above the opening facing the raw powder discharging part at a position spaced from the raw powder discharging part, and a part of the raw powder and the gas comes from below the opening Inhalation; and a accommodating part, which stores the original powder discharge part and the suction part inside and surrounds the outer periphery, and is used for accumulating the above-mentioned original powder during classification or classification treatment; the original powder release part is constituted as: It has a turning part provided with a fixed blade inclined in the circumferential direction, and the raw powder supplied from the raw powder supply pipe in the above process is swiveled by the turning part together with the gas, and is radiated from the upper surface of the opening while rotating. ; The inhalation part is configured to: release from the upper surface of the opening of the original powder discharge part in a radial manner and rotate while rotating. Said original powder inhaler. [Effect of the invention]

According to the present invention, it is possible to provide a classification device and a classification system that classify powders with high accuracy with a simple structure.

Hereinafter, an embodiment of the present invention will be described together with the drawings.

<Grading System> FIG. 1 is an explanatory diagram showing the structure of the ranking system 100. The classification system 100 is provided with a raw powder storage chamber 11 for storing raw powder of fly ash, a classification device 1 for classifying the raw powder, and a bag filter 12 for filtering and capturing the fine powder classified from the raw powder; The raw powder in the raw powder storage chamber 11 is carried in the air flow and is sent to the raw powder conveying mechanism 14 of the classifying device 1, a fine powder conveying pipe 5a connecting the classifying device 1 and the bag filter 12, and the bag filter 12 The collected fine powder is conveyed to a fine powder conveying mechanism 15 in a product compartment (not shown).

The raw powder conveying mechanism 14 includes a rotary feeder 14 a connected to the bottom portion 11 a of the raw powder storage compartment 11 with the IN side, an acceleration tube 14 b connected to the OUT side of the rotary feeder 14 a, and a Luer blower 13. The IN side of the accelerating tube 14b is connected to the Roux blower 13 via a pipe 13a provided with a gas valve 14c midway, and the OUT side thereof is connected to the classification device 1 via a raw powder supply pipe 14d.

The raw powder conveying mechanism 14 performs the following operations during operation. First, the rotary feeder 14a is activated, and the raw powder is quantitatively supplied from the raw powder silo 11 to the acceleration tube 14b. Next, the air valve 14c is switched to the open state, and compressed air is sent in from the Luer blower 13 via the pipe 13a to the IN side of the acceleration pipe 14b. However, the compressed air is not limited to compressed air, but may be a compressed gas compressed by a suitable gas such as nitrogen. In the acceleration tube 14b, the compressed air accelerates the flow rate, and the raw powder in the acceleration tube 14b is dispersed and floated. Then, the raw powder is carried on the air stream, is discharged from the OUT side of the acceleration tube 14b, and is conveyed to the classification device 1 through the raw powder supply pipe 14d.

The classification device 1 classifies the raw powder. The details of the action will be described later. In addition, as shown in the figure, two or more classification devices 1 may be arranged in series, thereby achieving higher performance classification.

The fine powder classified by the classifying device 1 is conveyed in the air flow through the fine powder conveying pipe 5 a and is sent to the bag filter 12. The bag filter 12 includes a filter cloth 12b for collecting and collecting fine powder from an air flow accompanied by the fine powder, and a hopper 12c for collecting the fine powder falling from the filter cloth 12b.

The fine powder conveying mechanism 15 includes a rotary feeder 15 a connected to the bottom portion 12 a of the hopper 12 c with the IN side, an acceleration tube 15 b connected to the OUT side of the rotary feeder 15 a, and a Rouer blower 13. The IN side of the accelerating tube 15b is connected to the Roux blower 13 via a pipe 13c provided with an air valve 15c midway, and the OUT side thereof is connected to a product compartment (not shown) via a fine powder recovery pipe 15d.

The fine powder conveying mechanism 15 operates in the same manner as the original powder conveying mechanism 14 described above. That is, the rotary feeder 15a is activated, and fine powder is quantitatively supplied from the hopper 12c to the acceleration tube 15b. Next, the air valve 15c is switched to an open state, and compressed air is sent in from the Luer blower 13 to the IN side of the acceleration tube 15b via a pipe 13c. In the acceleration tube 15b, the compressed air accelerates the flow velocity, and the fine powder in the acceleration tube 15b is dispersed and floated. Then, the fine powder is carried on the air stream, is discharged from the OUT side of the acceleration tube 15b, and is conveyed to the product compartment through the fine powder recovery pipe 15d (not shown).

<Grading device> FIG. 2 is an explanatory diagram schematically showing the structure of the grading device 1, FIG. 3 (A) is a cross-sectional view of the grading device AA, and FIG. 3 (B) is the original powder discharging section 6 of the grading device 1. A longitudinal sectional view, and FIG. 3 (C) is a perspective view of a BB cross section of the classification device 1.

The classification device 1 is provided with a raw powder discharge portion 6 that discharges the raw powder together with air, and a raw powder discharge portion 6 that is disposed opposite to the raw powder discharge portion 6 at a position separated from the raw powder discharge portion 6 and discharges the raw powder discharge portion 6. Inhalation section 4 that sucks into part of the air, the original powder discharge section 6 and the inhalation section 4 are housed inside and surround the outer periphery of the section 2, and the classification process is completed or completed after the bottom 22 of the accommodation section 2 is stacked The raw powder conveying process 7 of the raw powder conveying mechanism.

The original powder discharge portion 6 is a substantially cylindrical shape with a center line facing the vertical direction, the upper surface is substantially horizontal and has a slightly circular opening 62, and a turning portion 61 that rotates the original powder and air inside. With this structure, the raw powder and air supplied from below can be rotated clockwise by the turning portion 61 in plan view, and can be released radially from the opening 62 above.

The original powder releasing portion 6 is disposed above the center in the internal space of the accommodating portion 2. In this embodiment, it is disposed slightly above the center. In this way, a large amount of raw powder can be accumulated in an area of the internal space of the containing portion 2 which is lower than the original powder emitting portion 6, and the original powder inhaled by the inhalation portion 4 in the area higher than the original powder emitting portion 6. Rating.

As shown in FIG. 3 (C), the turning portion 61 is formed by a plurality of fixed blades 61a. These fixed blades 61a have a center on a straight line passing through the center of the original powder discharge portion 6 and the center of the suction portion 4 and The center expands in a radial direction and is inclined in a circumferential direction. In addition, the turning portion 61 is formed by three fixed blades 61 a here, but the fixed blades 61 a may be a plurality of pieces, and may be four, six, or eight pieces. Here, the turning portion 61 is formed into three types by three fixed blades 61a. However, the three fixed blades 61a may be arranged on the center line at intervals to form a multi-connection type (multi-stage type).

Below the raw powder discharge portion 6, a cylindrical raw powder supply pipe 73 that passes through the central axis of the storage portion 2 in the up-down direction is connected. In this process, the raw powder supply piping 73 is formed with a certain thickness with a smaller radius (that is, thinner) than the raw powder discharge portion 6, and it is protruded to the containing portion 2 by changing the direction of 90 degrees near the lower part inside the containing portion 2. In addition, it is connected to the acceleration tube 72 after changing its direction downward. A switching valve 73a is provided in the middle of the raw powder supply piping 73 during processing outside the storage section 2.

The suction part 4 has a substantially cylindrical shape with a center line facing the vertical direction, and a substantially horizontal, slightly circular opening 42 is provided on the lower side. The suction part 4 is arranged above the original powder discharge part 6 to face the original powder discharge part 6. The suction section 4 is connected to a fine powder discharge pipe 5 that discharges a part of the raw powder and air sucked by the suction section 4 on the opposite side (that is, above) that is not opposite to the raw powder discharge section 6.

The size of the opening 42 of the suction portion 4 is the same as that of the opening 62 of the original powder discharge portion 6. The size of the opening of the opening 42 of the suction portion 4 can be set to be larger than the opening 62 of the original powder discharge portion 6 or smaller than the opening 62 of the original powder discharge portion 6.

In addition, the suction portion 4 is formed from the original powder discharge portion 6 so that the central axis of the cylindrical shape (circular opening 42) coincides with the central axis of the cylindrical shape (circular opening 62) of the original powder discharge portion 6. The openings 62 of the original powder discharge portion 6 and the openings 42 of the suction portion 4 are arranged to be opposed to each other vertically. Thereby, among the original powder discharged from the original powder discharge part 6, the particle size sucked by the suction part 4 can be adjusted appropriately.

The lower part of the fine powder discharge pipe 5 is connected to the inhalation part 4 in the accommodating part 2 and the upper part is arranged outside the inhalation part 4 as a part of the graded supplementation of the raw powder and air in the inhalation part 4 The external discharge pipe functions.

This fine powder discharge tube 5 is composed of two sliding tubes (inner tube and outer tube) that can slide freely. The outer tube is fixed to the receiving portion 2 and the inner tube is connected to the suction portion 4. The fine powder discharge tube 5 has a position-variable screw 4a, which prevents the inner tube from sliding when the outer tube is screwed in from the outside and presses the outer peripheral surface of the inner tube with its front end. The relative position of the inner tube and the outer tube can be changed and given. fixed. Thereby, the relative positions of the suction portion 4 connected to the inner tube, the storage portion 2 fixed to the outer tube, and the original powder discharge portion 6 stored inside the storage portion 4 can be changed and fixed. That is, the distance D between the suction portion 4 and the original powder discharge portion 6 can be changed. The configuration for changing the distance D between the suction section 4 and the original powder discharge section 6 is not limited to this, and an appropriate configuration may be adopted.

The accommodating portion 2 is a slightly cylindrical container whose center line faces the vertical direction, and is formed in a shape having a larger length and a longer radius than the original powder discharge portion 6. The radius of this accommodating portion 2 is preferably more than twice the radius of the original powder discharge portion 6. In this embodiment, the radius is about 3 times.

The cylindrical portion of the accommodating portion 2 functions as a swirling flow guide wall 21 that allows swirling flow to flow along the inner surface of the wall. The swirling flow guide wall 21 is provided with a supply nozzle 3 (see FIG. 3 (A)) that advances straight in a tangential direction of a wall surface near the suction portion 4. From this point on, the supply nozzle 3 supplies the raw powder together with the air into the accommodation portion 2. In this embodiment, the supply nozzle 3 is arranged such that the raw powder and air flowing into the swirling flow guide wall 21 rotate (rotate) clockwise in a planar view in the swirling flow guide wall 21. Thereby, in the swirling flow guide wall 21, the rotation direction (rotating direction) of the raw powder and air supplied from the supply nozzle 3 as viewed from the plane is configured to be the plane of the raw powder and air discharged from the raw powder discharge portion 6. The observed turning direction (turning direction) is the same.

The processing raw powder conveying mechanism 7 includes a rotary feeder 71 connected to the bottom 22 of the accommodating section 2 with the IN side, an accelerating tube 72 connected to the OUT side of the rotary feeder 71, and a Lush blower 13 (see (Figure 1). The accelerating tube 72 is connected on the IN side to a Lubbeck blower 13 (see FIG. 1) via a pipe 13b provided with a valve 74a in the middle, and the OUT side is connected to the processing raw powder supply pipe 73 and the processing raw powder recovery pipe 75. During the processing, the raw powder supply pipe 73 is provided with a switching valve 73 a in the middle, and is connected to the raw powder discharge portion 6. On the other hand, a switching valve 75a is provided in the middle of the processed raw powder recovery pipe 75 and is connected to a product compartment (not shown).

分级 Grading operation at the time of supply of raw powder≫ FIG. 4 (A) is an explanatory diagram schematically showing the state of classification at the time of supply of raw powder. When the original powder conveying mechanism 14 (see FIG. 1) is activated, the original powder is conveyed to the supply nozzle 3 of the classification device 1 together with air through the original powder supply pipe 14 d. The original powder is then discharged from the supply nozzle 3 into the accommodation portion 2 together with the air, and flows along the swirling flow guide wall 21, and falls while generating a swirling flow (see FIG. 3 (A)). With this swirling flow, there is a centrifugal force on the original powder. At this time, the fine powder FA1 (see FIG. 4 (A)) in the original powder has a small centrifugal force due to its small mass, and a part of the swirling flow guide wall 21 is sucked into the suction portion 4 together with the air. On the other hand, the remaining raw powder FA2 swirls along the swirling flow guide wall 21, and gradually descends by the action of gravity, and accumulates on the bottom 22 of the containing portion 2 (see FIG. 4 (B)). When a certain amount of raw powder has been supplied into the accommodating section 2, the raw powder conveying mechanism 14 (see FIG. 1) is stopped, and the supply of raw powder to the classification device 1 is stopped.

≫Disintegration and classification operation of raw powder during processing≫ FIG. 4 (B) is an explanatory diagram schematically showing a state of disintegration and classification of raw powder during processing. While stopping the raw powder conveying mechanism 14 (refer to FIG. 1) and stopping the supply of raw powder to the classifying device 1, the processing raw powder conveying mechanism 7 is operated in the following manner, and the supply is started in the classifying device 1. Circulation conveying of processed raw powder after classifying. In addition, the stopping of the raw powder conveying mechanism 14 and the operation of the processing of the raw powder conveying mechanism 7 are not limited to the same time, but may be one after the other. Here, in the order of stopping the raw powder conveying mechanism 14 after the operation of the processing of the raw powder conveying mechanism 7 is started, the supply and classification of the raw powder can be appropriately implemented even if there is an instant when both of them are operating. Specifically, since the supply nozzle 3 is provided at a position where the original powder and the air release direction from the supply nozzle 3 deviate, most of the original powder supplied from the supply nozzle 3 is not sucked by the suction unit 4 and falls. Those who are inhaled into the inhalation section 4 are only fine-sized particles that are inhaled into the inhalation section 4 after being classified, and therefore have no effect on the classification performance.

First, the rotary feeder 71 is activated, and the raw powder accumulated in the processing of the bottom portion 22 of the accommodating portion 2 is quantitatively supplied to the acceleration tube 72. Next, the air valve 74a is switched to the open state (see FIG. 2), and the compressed air is sent from the Roux blower 13 (refer to FIG. 1) to the IN side of the acceleration tube 72 through a pipe 13b. In addition, the person passing in is not limited to compressed air, but may be a compressed gas obtained by compressing a gas such as nitrogen. In the acceleration tube 72, the compressed air accelerates the flow velocity, and the raw powder in the acceleration tube 72 is dispersed and floated. The original powder is discharged from the OUT side of the accelerating tube 72 in an air stream. At this time, the switching valve 73a provided in the processing original powder supply pipe 73 is set to the open state, and the switching valve 75a provided in the processing original powder recovery pipe 75 is set to the closed state. Thereby, the raw powder is carried in the air stream, and is conveyed to the raw powder discharge portion 6 through the raw powder supply pipe 73 during processing.

The raw powder conveyed to the raw powder discharge portion 6 contains fine powder and coarse powder that are not sucked by the suction portion 4 due to the grading operation when the raw powder is supplied, and remain. The fine powder is a particle having a small particle size. The coarse powder contains particles with a large particle size (authentic coarse powder), and also contains a plurality of particles with a small particle size (fine powder) that are combined with each other with a weak binding force to become a bunch of grapes like grape bunches, or coarse coarse particles. Around the powder, a plurality of fine powders are combined into a lump or the like with a weak bonding force.

The raw powder transported from the raw powder supply piping 73 to the raw powder discharge section 6 from the processing is carried by the air flow directly above the center line of the raw powder discharge section 6 (vertically above), and collides with the fixed blade 61a forming the turning section 61 (See Figure 3 (B)). By this collision, most of the clumps were disintegrated, and a plurality of individual fine powders were separated. Accordingly, in addition to the above-mentioned remaining fine powder, the raw powder delivered to the original powder discharge unit 6 becomes a fine powder newly generated by disintegration, agglomerates remaining without being disintegrated, and a true coarse powder.

The air flow carrying these fine powders, agglomerates, and true coarse powders is formed around the center line of the original powder discharge portion 6 by a plurality of fixed blades 61a that extend from the center to the radial direction and are inclined in the circumferential direction. A swirling flow that goes straight in the direction of the centerline, swirls from the opening 62, and releases radially toward the upper side. Due to its small mass, the fine powder is hardly affected by the centrifugal force of the swirling flow. Therefore, the fine powder FB1 travels while rotating in the centerline direction or a direction slightly inclined from the centerline direction, and is sucked by the suction portion 4 (see FIG. 4 (B)). On the other hand, the clumps and the true coarse powder that are not completely disintegrated are greatly affected by the centrifugal force due to the large mass. Therefore, the clumps FB2 and the true coarse powder FB3 travel while rotating in a direction close to the radial direction that is greatly deviated from the centerline direction, and then slowly fall along the swirling flow guide wall 21 while rotating due to the effect of gravity, and again. Stacked on the bottom 22 of the receiving section 2.

As mentioned above, the fine powder separated due to the disintegration of the remaining fine powder and the agglomerates is sucked by the inhalation section 4. On the other hand, the agglomerates and the true coarse powder are accumulated on the bottom 22 of the containing section 2 again, and the original powder is classified. Implemented.

The agglomerates and the true coarse powder accumulated on the bottom 22 of the containing section 2 can be circulated in the classification device 1 by continuously operating the processing raw powder conveying mechanism 7, and can be conveyed to the original powder discharging section 6 multiple times. As described above, the agglomerates conveyed to the original powder discharge section 6 are disintegrated to separate fine powder again and become smaller agglomerates. Further, the fine powder separated again and the fine powder remaining without being sucked are sucked by the sucking section 4. By continuously operating the processing raw powder conveying mechanism 7 in this manner, the disintegration can be repeated several times until the agglomerates become non-agglomerated, and it can be repeated until the fine powder contained in the raw powder is substantially inhaled. As a result, the fine powder existing as agglomerates is finally almost completely separated and sucked in by the suction unit 4 and recovered. Therefore, the recovery rate of fine powder can be improved.

FIG. 5 is an explanatory diagram schematically showing a state of classification at the time of disintegration classification when the position of the suction section is changed.

As described above, the change in the distance between the suction section 4 and the original powder discharge section 6 can be achieved by changing the position of the suction section 4 using the position-variable screw 4a provided in the fine powder discharge tube 5. For example, if the position of the inhalation part 4 is set to P2, and the distance between the inhalation part 4 and the original powder discharge part 6 is set to a shorter D2, not only the fine powder FB1, but also some small-scale clumps are also inhaled to The suction part 4 may be in danger. However, by setting the position of the suction section 4 to P1, the distance between the suction section 4 and the original powder discharge section 6 is increased to D1 (enlarged interval), and only the fine powder FB1 can be sucked from the suction section 4. Thereby, the accuracy of classifying the fine powder and the other than the fine powder can be improved. If so, by increasing the distance D between the suction portion 4 and the original powder discharge portion 6, only finer fine powder can be sucked in by the suction portion 4, otherwise, the distance D between the suction portion 4 and the original powder discharge portion 6 is narrowed. It is possible to include thicker particles and also suck them in from the suction unit 4. Therefore, by adjusting the distance (interval) between the suction section 4 and the original powder discharge section 6, the maximum particle diameter of the fine powder sucked by the suction section 4 can be adjusted, and the accuracy of classification is improved.

回收 Recycling action of processed raw powder (coarse powder) ≫ When recycling processed raw powder (coarse powder), the processing raw powder conveying mechanism 7 is temporarily stopped, and the circulating supply of processed raw powder in the classification device 1 is stopped (see (Figure 2). Then, the switching valve 73a provided in the processing original powder supply pipe 73 is switched to a closed state, and the switching valve 75a provided in the processing original powder recovery pipe 75 is switched to an open state. Then, the processing raw powder transportation mechanism 7 is operated again, and the processed raw powder (coarse powder) is carried in the air flow, and is conveyed to the product compartment (not shown) through the processed raw powder recovery pipe 75.

With the above structure and operation, the classification device 1 can classify the powder with high accuracy with a simple structure. As described in detail below, the classifying device 1 includes a raw powder discharge portion 6 that rotates the raw powder and gas and discharges them together, and is arranged opposite to the raw powder discharge portion 6 at a position spaced from the raw powder discharge portion 6 and arranges the original powder. An inhalation part 4 inhaling part of the powder and the gas, and the original powder discharge part 6 has a turning part 61 for rotating the original powder and the gas. Therefore, the original powder is rotated by the original powder discharge portion 6. As a result, the micro-powder and the micro-powder other than the micro-powder are subjected to centrifugal forces of different magnitudes. In addition, the fine powder having a small centrifugal force is absorbed by the suction portion 4 disposed opposite to the raw powder discharge portion 6 at a position separated from the raw powder discharge portion 6. If so, a simple structured classification device 1 can be used to classify the raw powder into fine powder and other fine powder.

In addition, the main one of the necessary electric power is only electric power for operating the Roots blower 13, which can save electric power. That is, the fixed blade 61a is fixed to the turning portion 61, and it is not necessary to turn the fixed blade 61a by a motor or the like, so such electric power may not be used.

The classification device 1 includes a storage portion 2 that stores the original powder discharge portion 6 and the suction portion 4 inside and surrounds the outer periphery thereof, and a inlet 22 having a bottom portion 22 that takes in the raw powder below the storage portion 2 together with the gas. Then, the taken-in raw powder and gas are sent out from the inlet to a delivery transfer pipe (processing raw powder conveying mechanism 7) for the raw powder discharge section 6. Therefore, the raw powder containing fine powder can be sucked by the suction portion 4 and accumulated on the bottom portion 22 of the containing portion 2, and then discharged again from the raw powder discharge portion 6. Thereby, the inhalation part 4 gets the opportunity to inhale the fine powder again, and the recovery rate of the fine powder is improved. In particular, the "grading operation when the raw powder is supplied", the "grading operation of the raw powder during processing", and the "recycling operation of the processed raw powder (coarse powder)" are implemented in separate batch processes. In this way, the "disintegration and classification operation of the raw powder during processing" can be implemented until the recovery rate of the fine powder becomes the desired recovery rate, and a stable recovery rate can be achieved.

The classification device 1 is provided with a discharge port (the raw powder supply piping 73 during processing of the raw powder conveying mechanism 7), and the vicinity of the discharge port is set as the raw powder discharge portion 6, and the turning portion 61 is provided on the discharge transfer tube. Inside. Therefore, the raw powder accumulated in the bottom portion 22 in the containing portion 2 can be rotated and discharged again from the raw powder discharge portion 6 having the turning portion 61. Thereby, the classification using the effect of the centrifugal force originating from the convolution is repeated, and the recovery rate of the micronized powder can be improved while maintaining the accuracy of the classification of the micronized powder and the micronized powder.

In the classifying device 1, the turning portion 61 is formed by a plurality of fixed blades 61a. These fixed blades 61a have a center on a straight line passing through the center of the original powder discharge portion 6 and the center of the suction portion 4 and expand in a radial direction from the center. And inclined in the circumferential direction. Therefore, the raw powder conveyed to the raw powder discharge portion 6 collides with the fixed blade 61 a of the turning portion 61. At this time, the agglomerates contained in the original powder are disintegrated and fine powder of at least a plurality of monomers is separated. The separated fine powder is sucked by the suction unit 4. As a result, the fine powder is regenerated from the agglomerates that should have been treated as coarse powder and recovered, so the recovery rate of fine powder is greatly improved.

The classification device 1 is provided with a distance changing mechanism (position-variable screw 4a provided in the fine powder discharge tube 5) for changing the distance between the suction portion 4 and the original powder discharge portion 6. Therefore, as described above, the classification accuracy of the micronized powder and the micronized powder is improved, and the classification accuracy is also improved.

In the classifying device 1, the storage portion 2 is a slightly cylindrical shape with the center line in the vertical direction, and the inner wall (swirling flow guide wall 21) of the storage portion 2 near the suction portion 4 is along the tangential direction. The gas flows into the supply nozzle 3 together. Therefore, classification can also be performed when the raw powder is supplied to the classification device 1, and the classification efficiency is good.

In addition, the opening 62 of the original powder discharge portion 6 is similar to the opening 42 of the suction portion 4 (the embodiment is circular) and is arranged in a manner that the central axis is consistent. Therefore, the original powder discharged from the original powder discharge portion 6 may be The distribution is sucked into the suction part 4 uniformly and stably. Therefore, particles (fine powder) of a desired size can be appropriately inhaled.

The invention in this case is not limited to this embodiment, and various other embodiments can be adopted. For example, "the grading operation during the supply of raw powder", "the grading operation of the raw powder during processing", and the "recycling operation of the processed raw powder (coarse powder)" are batch processing, but the whole can also be set as Simultaneous processing. Or, first perform the "grading operation during the supply of raw powder" and "the operation of disintegrating and grading the original powder during processing", and then start the "recycling operation of processing the original powder (coarse powder)" after a certain time has elapsed. As if the storage unit 2 is supplied with a sufficient amount of raw powder, the "grading operation at the time of supply of raw powder" is temporarily stopped, and if the storage powder of the storage unit 2 is reduced to a specific amount, the "grading operation at the time of supply of raw powder" is restarted. You can also change the movement / stop of each part manually.

In addition, the raw powder (powder) classified by the classification device 1 is not limited to fly ash, and various powders such as flour or cement (a plurality of particles having different particle sizes and / or particle masses) may be used. This is also the case, as various raw powders can be appropriately disintegrated and classified. [Industrial availability]

The invention of this case can be used in industries related to the classification of powders.

1‧‧‧Classification device

2‧‧‧ Containment Department

3‧‧‧ supply nozzle

4‧‧‧ Inhalation

5‧‧‧ fine powder discharge tube

6‧‧‧ Original powder release department

7‧‧‧ handling raw powder conveying mechanism

11‧‧‧ The original powder warehouse room

12‧‧‧ bag filter

100‧‧‧ Grading System

FIG. 1 is an explanatory diagram showing the structure of the classification system. FIG. 2 is an explanatory diagram schematically showing the structure of the classification device. FIGS. 3 (A) to (C) are explanatory diagrams illustrating the structure near the original powder discharge portion of the classification device. (4) (A) and (B) of FIG. 4 are explanatory diagrams for explaining the operation when the raw powder is supplied and when it is disintegrated and classified. (5) FIG. 5 is an explanatory diagram schematically showing a state of classification at the time of disintegration classification when the position of the suction section is changed.

Claims (4)

A grading device comprising: (1) a raw powder supply pipe during processing, carrying the raw powder in an air stream; and (2) a raw powder discharge unit connected to the raw powder supply pipe during the processing, and discharging the raw powder together with a gas from above the opening. (2) an inhalation part, which is arranged above the opening facing the raw powder releasing part at a position spaced from the raw powder releasing part, and sucks a part of the raw powder and the gas from below the opening; and a containing part It contains the raw powder discharge part and the suction part inside and surrounds the outer periphery, and is used to accumulate the raw powder during or after the classification process; The raw powder discharge part is configured to have a circumferential direction The slewing part of the inclined fixed blade rotates the raw powder supplied from the raw powder supply piping in the above process through the slewing part together with the gas, and releases it radially from the upper side of the opening while swirling; To: radiate from the upper surface of the opening of the original powder discharge portion The side of the roundabout and the raw powder inhalation side of travel. For example, the grading device in the first scope of the patent application, wherein the central axis of the raw powder discharge portion and the central axis of the suction portion are arranged to be consistent. For example, the grading device in the first or second scope of the patent application includes a distance changing mechanism for changing the relative position of the suction section and the original powder discharge section and fixing the distance. A grading system with: a raw powder storage room for storing raw powder; a classifying device such as the scope of patent application for item 1, 2 or 3; conveying the above raw powder with gas from the raw powder storage room via a raw powder supply pipe The raw powder conveying mechanism of the above-mentioned classifying device; 微 a fine powder discharge pipe connected to the suction part of the above-mentioned classifying device; and a bag filter that filters and captures the fine powder from the fine powder-containing gas discharged from the above-mentioned classifying device through the above-mentioned fine powder discharge pipe.