JP6262907B1 - Powder classification device and classification system - Google Patents

Abstract

To provide a classification device and a classification system for simply classifying powder such as fly ash. A raw powder discharge part for discharging raw powder together with a gas, and a part of the raw powder and the gas disposed at a position spaced apart from the raw powder discharge part and facing the raw powder discharge part. The raw powder discharge part 6 has a swivel part 61 for swirling the raw powder and the gas, and accommodates the raw powder discharge part 6 and the suction part 4 therein. A container 2 that surrounds the outer periphery, and an intake that takes in the raw powder below the container 2 together with the gas, and the raw powder that is taken in from the intake to the raw powder discharge part 6 and the And a discharge carrier pipe for sending out gas. [Selection] Figure 2

Description

  The present invention relates to a powder classification apparatus and classification system.

Conventionally, a classification device for classifying powder into particles having a size according to the application has been proposed.
As one of such classifiers, a classifier that classifies by using centrifugal force generated by rotation of a classifying rotor has been proposed (see Patent Document 1). In this classifier, the direction in which the classifying air is introduced is opposite to the direction in which the classifying rotor rotates in the opposite direction. Accordingly, it is described that a large separation force can be obtained by applying a sudden change in the flow direction at the rotary blade inlet of the classification rotor, and more accurate classification can be performed with a small number of rotations.

  Further, a classifier has been proposed that classifies powder supplied to the outside of the classification rotor by guiding the powder to the inside of the classification rotor based on the relationship between centrifugal force and centripetal force (Patent Document). 2). In this classifier, each rotating blade of the classifying rotor is disposed in a state in which one support member side is inclined with respect to the support member so as to be closer to the rotation direction than the other support member side. It is what. Accordingly, it is described that the separation performance can be improved without increasing the rotational speed of the classification rotor.

JP 2001-353473 A JP 2005-342556 A

  However, in a classifier using a classifying rotor, in order to ensure classifying performance, mechanical strength and driving power for rotating the classifying roller at a certain rotational speed are required.

  This invention is made | formed in view of the above-mentioned problem, and it aims at providing the classification apparatus and classification system which classify | categorize powder with high precision with a simple structure.

This invention is a raw powder supply pipe for processing to transport raw powder in an air stream, and a raw powder discharge part for discharging the raw powder together with gas from the upper surface connected to and opened above the raw powder supply pipe for processing , An inhalation part that is disposed opposite to the upper surface of the raw powder discharge part at a position spaced apart from the raw powder discharge part and sucks the raw powder and a part of the gas from the lower surface that opens; and the raw powder discharge And a suction portion that encloses the suction portion and surrounds the outer periphery to deposit the raw powder that has been classified or has been subjected to the classification treatment , and the raw powder discharge portion has fixed blades that are inclined in the circumferential direction. The inhalation unit has a swirl part inside, and is configured to discharge the raw powder supplied from the raw powder supply pipe during processing together with the gas by the swirl part and discharge radially while swirling from the opening upper surface. Part of the raw powder discharge part. Characterized in that the upper surface of which is the original powder classifying device which is configured to inhale the traveling while swirling emitted radially.

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

Explanatory drawing which shows the structure of a classification system. Explanatory drawing which shows the structure of a classification apparatus typically. Explanatory drawing explaining the structure of the raw powder discharge | release part vicinity of a classification device. Explanatory drawing explaining operation | movement at the time of raw | natural powder supply and crushing classification. Explanatory drawing which shows typically the mode of the classification | category at the time of crushing classification in the case of changing the position of a suction part.

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

<Classification system>
FIG. 1 is an explanatory diagram showing the configuration of the classification system 100.
The classification system 100 includes a raw powder silo 11 for storing fly ash raw powder, a classification device 1 for classifying the raw powder, and a bag filter 12 for filtering and collecting the fine powder classified from the raw powder. 11 is a raw powder transport mechanism 14 for transporting the raw powder in the airflow to the classifier 1, a fine powder transport pipe 5 a connecting the classifier 1 and the bag filter 12, and the fine powder collected by the bag filter 12. And a fine powder transport mechanism 15 for transporting to a product silo (not shown).

  The raw powder transport mechanism 14 includes a rotary feeder 14a whose IN side is connected to the bottom 11a of the raw powder silo 11, an acceleration tube 14b connected to the OUT side of the rotary feeder 14a, and a roots blower 13. The accelerating pipe 14b is connected to the roots blower 13 through a pipe 13a provided with an air valve 14c in the middle of the acceleration pipe 14b, and connected to the classifier 1 through a raw powder supply pipe 14d.

  The raw powder transport mechanism 14 operates as follows 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 blown from the roots blower 13 to the IN side of the acceleration pipe 14b via the pipe 13a. In addition, what blows is not restricted to compressed air, What is necessary is just the compressed gas which compressed suitable gas, such as nitrogen. In the acceleration tube 14b, the compressed air accelerates the flow velocity and disperses and floats the raw powder in the acceleration tube 14b. Then, the raw powder rides on the air flow, is discharged from the OUT side of the acceleration tube 14b, and is transported to the classification device 1 through the raw powder supply pipe 14d.

  The classification device 1 classifies the raw powder. Details of the operation will be described later. Moreover, as shown in the figure, the classifying device 1 may be installed with two or a plurality of units in series, thereby realizing higher performance classification.

The fine powder classified by the classification device 1 is transported through the fine powder transport pipe 5 a on the air flow and sent to the bag filter 12.
The bag filter 12 includes a filter cloth 12b for filtering and collecting fine powder from an air flow accompanied by fine powder, and a hopper 12c for collecting the fine powder removed from the filter cloth 12b.

  The fine powder transport mechanism 15 includes a rotary feeder 15a whose IN side is connected to the bottom 12a of the hopper 12c, an acceleration pipe 15b connected to the OUT side of the rotary feeder 15a, and a roots blower 13. The accelerating pipe 15b is connected to the roots blower 13 via a pipe 13c provided with an air valve 15c on the way, and to the product silo (not shown) via the fine powder collection pipe 15d.

  The fine powder transport mechanism 15 operates in the same manner as the above-described raw powder transport mechanism 14 during operation. 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 the open state, and compressed air is blown from the roots blower 13 to the IN side of the acceleration pipe 15b via the pipe 13c. In the acceleration tube 15b, the compressed air accelerates the flow velocity and disperses and floats the fine powder in the acceleration tube 15b. Then, the fine powder rides on the air flow, is discharged from the OUT side of the acceleration pipe 15b, and is transported to the product silo (not shown) through the fine powder collection pipe 15d.

<Classifier>
FIG. 2 is an explanatory diagram schematically showing the structure of the classification device 1, FIG. 3A is a cross-sectional view taken along line AA of the classification device, and FIG. 3B is an original diagram of the classification device 1. It is a longitudinal cross-sectional view of the powder discharge | release part 6, and the figure (C) is a perspective view of the BB cross section of the classification apparatus 1. FIG.

  The classifier 1 is disposed to face the raw powder discharge unit 6 at a position separated from the raw powder discharge unit 6 and the raw powder discharge unit 6 that discharges the raw powder together with air. During the classification process deposited on the bottom portion 22 of the suction portion 4 for sucking part of the powder and air, the suction portion 4 for storing the raw powder discharge portion 6 and the suction portion 4 and surrounding the outer periphery, and the bottom portion 22 of the storage portion 2 And a treated raw material transport mechanism 7 for transporting the classified raw powder.

  The raw powder discharge part 6 has a substantially cylindrical shape with a center line facing the vertical direction, an upper surface is substantially horizontal and has a substantially circular opening 62, and has a turning part 61 for turning the raw powder and air inside. ing. With this structure, raw powder and air supplied from below are swirled clockwise in plan view by the swivel unit 61 and discharged radially from the upper opening 62.

  The raw powder discharge | release part 6 is provided above the center of the interior space of the accommodating part 2, and in this Example, it is provided a little above the center. As a result, a large amount of raw powder can be deposited in the area below the raw powder discharge section 6 in the internal space of the storage section 2 and the raw material sucked by the suction section 4 in the area above the raw powder discharge section 6. The powder can be classified.

  As shown in FIG. 3 (C), the swivel unit 61 has a center on a straight line passing through the center of the raw powder discharge unit 6 and the center of the suction unit 4 and extends radially from the center in the circumferential direction. It is formed by a plurality of inclined fixed blades 61a. Here, the swivel unit 61 is formed by three fixed blades 61a, but there may be a plurality of fixed blades 61a, and may be four, six, or eight. In addition, the swivel unit 61 is formed in one set by three fixed blades 61a in this case, but a multiple series (multistage type) in which a plurality of sets of three fixed blades 61a are arranged at intervals on the center line. ).

  A cylindrical raw powder supply pipe 73 is connected to the lower part of the raw powder discharge part 6 and passes through the central axis of the housing part 2 in the vertical direction. The raw powder supply pipe 73 during processing is formed to have a constant thickness with a smaller radius (that is, thinner) than the raw powder discharge portion 6, and the direction of the storage portion 2 is changed by 90 degrees near the lower portion in the storage portion 2. After projecting outside and changing the direction further downward, it is connected to the acceleration tube 72. A switching valve 73 a is provided in the middle of the raw powder supply pipe 73 that is out of the housing unit 2.

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

  The size of the opening 42 of the suction part 4 is the same as the size of the opening 62 of the raw powder discharge part 6. Note that the size of the opening 42 of the suction part 4 can be appropriately configured such that it is larger than the opening 62 of the raw powder discharge part 6 or smaller than the opening 62 of the raw powder discharge part 6.

  The suction part 4 is vertically upward from the raw powder discharge part 6 so that the central axis of the cylindrical shape (circular opening 42) coincides with the central axis of the cylindrical form (circular opening 62) of the raw powder discharge part 6. The opening 42 of the suction part 4 and the opening 62 of the raw powder discharge part 6 are arranged to be spaced apart from each other. Thereby, the particle | grain size suck | inhaled with the suction | inhalation part 4 among the raw powders discharged | emitted from the raw powder discharge | release part 6 can be adjusted appropriately.

  The lower part of the fine powder discharge pipe 5 is connected to the suction part 4 in the suction part 4, and the upper part is arranged outside the suction part 4, and is classified from the raw powder and air in the suction part 4. It functions as a discharge pipe that conveys the supplemented part to the outside.

  The fine powder discharge pipe 5 is composed of a slidable double pipe (an inner pipe and an outer pipe). The outer pipe is fixed to the housing portion 2 and the inner tube is connected to the suction portion 4. The fine powder discharge pipe 5 is a screw screwed into the outer pipe from the outside. The tip of the screw presses the outer peripheral surface of the inner pipe to stop the sliding of the inner pipe, and the relative position between the inner pipe and the outer pipe is set. A position variable screw 4a that can be changed and fixed is provided. Thereby, it is possible to change and fix the relative positions of the suction part 4 connected to the inner pipe, the storage part 2 fixed to the outer pipe, and the raw powder discharge part 6 stored in the storage part 4. . That is, the distance D between the suction part 4 and the raw powder discharge part 6 can be changed. The structure for changing the distance D between the suction part 4 and the raw powder discharge part 6 is not limited to this and can be an appropriate structure.

  The accommodating part 2 is a substantially cylindrical container whose center line is directed in the vertical direction, and is formed in a vertically long shape larger than the radius of the raw powder discharging part 6. The radius of the accommodating portion 2 is preferably at least twice as large as the radius of the raw powder discharging portion 6, and is formed to be about three times in this embodiment.

  The accommodating part 2 functions as a swirl flow guide wall 21 in which the cylindrical portion flows along the swirl flow along the wall inner surface. The swirling flow guide wall 21 is provided with a supply nozzle 3 (see FIG. 3A) that goes straight along the tangential direction of the wall surface near the suction portion 4. The raw powder is supplied from the supply nozzle 3 into the accommodating portion 2 together with air. In this embodiment, the supply nozzle 3 is arranged such that the raw powder and air that have flowed into the swirl flow guide wall 21 rotate (turn) in the swirl flow guide wall 21 clockwise in plan view. Thus, in the swirl flow guide wall 21, the rotation direction (swirl direction) of the raw powder and air supplied from the supply nozzle 3 and the plan view of the raw powder and air discharged from the raw powder discharge unit 6. The rotation directions (turning directions) of the two are the same.

  The processing raw powder transport mechanism 7 includes a rotary feeder 71 whose IN side is connected to the bottom 22 of the storage unit 2, an acceleration pipe 72 connected to the OUT side of the rotary feeder 71, and a roots blower 13 (see FIG. 1). ing. The accelerating pipe 72 is connected to the Roots blower 13 (see FIG. 1) on the IN side via a pipe 13b provided with an air valve 74a on the way, and the OUT side is connected to the raw powder supply pipe 73 being processed and the processed raw powder collection pipe 75. It is connected. The raw powder supply pipe 73 during processing is provided with a switching valve 73 a in the middle and connected to the raw powder discharge unit 6. On the other hand, the processed raw powder collection pipe 75 is provided with a switching valve 75a in the middle and connected to a product silo (not shown).

≪Classification operation when supplying raw powder≫
FIG. 4 (A) is an explanatory view schematically showing a state of classification at the time of supplying raw powder.
When operating, the raw powder transport mechanism 14 (see FIG. 1) transports the raw powder together with air to the supply nozzle 3 of the classifier 1 through the raw powder supply pipe 14d. Thereafter, the raw powder is discharged together with air from the supply nozzle 3 into the housing portion 2, flows along the swirl flow guide wall 21, and falls while generating swirl flow (see FIG. 3A). Centrifugal force is applied to the raw powder by this swirling flow. At this time, the fine powder FA1 (see FIG. 4 (A)) in the raw powder has a small mass and therefore has a weak centrifugal force. On the other hand, the remaining raw powder FA2 gradually descends due to the action of gravity while turning along the swirling flow guide wall 21, and accumulates on the bottom 22 (see FIG. 4B) of the housing part 2. When a certain amount of raw powder is supplied into the container 2, the raw powder transport mechanism 14 (see FIG. 1) is stopped, and supply of the raw powder to the classifier 1 is stopped.

≪Crushing and classification of raw powder during processing≫
FIG. 4B is an explanatory view schematically showing the state of pulverization classification of the raw powder being processed.
At the same time as stopping the raw powder transport mechanism 14 (see FIG. 1) and stopping the raw powder supply to the classifier 1, the processing raw powder transport mechanism 7 is operated as follows, Begins circulating transportation of the processed raw powder classified at the time of supply. Note that the stopping of the raw powder transport mechanism 14 and the operation of the processing raw powder transport mechanism 7 are not limited to being performed at the same time. Here, even if there is a moment when both are operating as the order in which the raw powder transport mechanism 14 is stopped after the processing raw powder transport mechanism 7 is operated, the supply and classification of the raw powder are performed appropriately. . That is, since the supply nozzle 3 is provided at a position shifted from the discharge direction of the raw powder and air of the supply nozzle 3, most of the raw powder supplied from the supply nozzle 3 is sucked into the suction part 4. Fall without. Since only fine particles classified and sucked into the suction part 4 are sucked into the suction part 4, the classification performance is not affected.

  First, the rotary feeder 71 is activated, and the raw powder being processed deposited on the bottom 22 of the container 2 is quantitatively supplied to the acceleration tube 72. Next, the air valve 74a is switched to the open state (see FIG. 2), and compressed air is blown from the roots blower 13 (see FIG. 1) to the IN side of the acceleration pipe 72 via the pipe 13b. In addition, what blows is not restricted to compressed air, What is necessary is just the compressed gas which compressed gas, such as nitrogen. In the accelerating tube 72, the compressed air accelerates the flow velocity and disperses and floats the raw powder in the accelerating tube 72. The raw powder is released from the OUT side of the accelerating tube 72 along the air flow. At that time, the switching valve 73a provided in the raw powder supply pipe 73 during processing is opened, and the switching valve 75a provided in the processed raw powder collection pipe 75 is closed. As a result, the raw powder is transported to the raw powder discharge section 6 through the raw powder supply pipe 73 during processing in the air flow.

  The raw powder transported to the raw powder discharge unit 6 includes fine powder and coarse powder that remain without being sucked into the suction unit 4 by the classification operation when the raw powder is supplied. The fine powder is a particle having a small particle size. In coarse powder, in addition to large particles (true coarse particles), a plurality of small particles (fine particles) joined together with a weak binding force to form a lump like a bunch of grapes, Around the true coarse powder, a plurality of fine particles are combined with a weak binding force to form a cluster.

  The raw powder transported from the raw powder supply pipe 73 during processing to the raw powder discharge unit 6 rides on the air flow and goes straight upward (vertically upward) in the center line direction of the raw powder discharge unit 6 to form the swivel unit 61. It collides with the fixed blade 61a to be operated (see FIG. 3B). By this collision, many of the clusters are crushed and a plurality of single fine powders are separated. Thereby, in addition to the above-mentioned remaining fine powder, the raw powder that has been transported to the raw powder discharge unit 6 includes fine powder newly generated by crushing, clusters remaining without being crushed, and genuine coarse powder. become.

  The airflow on which these fine powder, clusters, and intrinsic coarse powder ride is swirled around the center line of the raw powder discharge section 6 by a plurality of fixed blades 61a that spread radially from the center and incline in the circumferential direction. However, it becomes a swirl flow that goes straight in the direction of the center line, and is discharged to the upper space radially while swirling from the opening 62. Since the fine powder has a small mass, the fine powder is not affected by the centrifugal force of the swirling flow. Therefore, the fine powder FB1 travels while turning in the center line direction or a direction slightly inclined from the center line direction, and is sucked by the suction portion 4 (see FIG. 4B). On the other hand, clusters and genuine coarse powder that remain without being crushed have a large mass and thus are greatly affected by centrifugal force. Therefore, the cluster FB2 and the intrinsic coarse powder FB3 travel while turning in a direction close to the radial direction greatly deviating from the center line direction, and then gradually turn by gravity due to turning along the swirling flow guide wall 21. It descends and deposits again on the bottom 22 of the housing part 2.

  As described above, the remaining fine powder and the fine powder separated by the crushing of the clusters are sucked by the suction part 4, while the clusters and the intrinsic coarse powder are again deposited on the bottom part 22 of the storage part 2, Raw powder classification is carried out.

  Clusters and genuine coarse powder deposited on the bottom 22 of the container 2 can be circulated through the classification device 1 by continuing to operate the processing raw powder transport mechanism 7 and transported to the raw powder discharge section 6 any number of times. . As described above, the clusters transported to the raw powder discharge unit 6 are crushed to newly separate fine powder, and become smaller clusters. Then, newly separated fine powder or fine powder remaining without being inhaled is inhaled by the inhalation unit 4. By continuing to operate the processing raw powder transport mechanism 7 in this manner, the crushing can be repeated any number of times until the cluster is no longer a cluster, and can be repeated until the fine powder contained in the raw powder is almost inhaled. it can. Thereby, most of the fine powders that existed as clusters are finally separated and are sucked and collected by the suction part 4. For this reason, the collection rate of fine powder can be improved.

  FIG. 5 is an explanatory view schematically showing the classification at the time of crushing classification when the position of the suction part is changed.

  As described above, the distance between the suction part 4 and the raw powder discharge part 6 can be changed by changing the position of the suction part 4 using the position variable screw 4 a provided in the fine powder discharge pipe 5. For example, when the position of the suction part 4 is set to P2 and the distance between the suction part 4 and the raw powder discharge part 6 is set to a short D2, not only the fine powder FB1, but also some of the small clusters are used in the suction part. 4 may be inhaled. However, by setting the position of the suction part 4 to P1 and extending the distance between the suction part 4 and the raw powder discharge part 6 to D1 (wider interval), only the fine powder FB1 can be sucked by the suction part 4. Become. Thereby, the accuracy which classifies fine powder and other than fine powder improves. In this way, by widening the distance D between the suction part 4 and the raw powder discharge part 6, only finer fine powder can be sucked by the suction part 4, and conversely, the suction part 4 and the raw powder discharge part 6 By narrowing the interval D, it is possible to inhale in the inhalation part 4 including coarser particles. Therefore, by adjusting the distance (interval) between the suction part 4 and the raw powder discharge part 6, it becomes possible to adjust the maximum particle size of the fine powder sucked by the suction part 4, and the classification accuracy is improved.

≪Recovery of processed raw powder (coarse powder) ≫
When recovering the processed raw powder (coarse powder), the processing raw powder transport mechanism 7 is temporarily stopped, and the circulating supply of the processing raw powder in the classification device 1 is stopped (see FIG. 2). And the switching valve 73a provided in the raw powder supply piping 73 in process is switched to a closed state, and the switching valve 75a provided in the processed raw powder collection piping 75 is switched to an open state. Then, the processed raw powder transport mechanism 7 is restarted so that the processed raw powder (coarse powder) rides on the air flow and passes through the processed raw powder collection pipe 75 to a product silo (not shown). Transported.

With the above configuration and operation, the classifying device 1 can classify the powder with high accuracy with a simple structure.
More specifically, the classifier 1 is disposed so as to face the raw powder discharge unit 6 at a position spaced from the raw powder discharge unit 6 and a raw powder discharge unit 6 that discharges the raw powder while swirling the gas. An inhalation part 4 for inhaling a part of the powder and gas is provided, and the raw powder discharge part 6 has a turning part 61 for revolving the raw powder with the gas. For this reason, the raw powder swirls at the raw powder discharge section 6. Thereby, except the fine powder and fine powder which perform a turning motion, the effect | action of the centrifugal force of a different magnitude | size is received. Then, the fine powder having a small centrifugal force action is absorbed by the suction part 4 disposed opposite to the raw powder discharge part 6 at a position separated from the raw powder discharge part 6. In this way, the raw powder can be classified into fine powder and other than fine powder by using the classification device 1 having a simple structure.

  Moreover, the main thing of the electric power required is the electric power for operating the Roots blower 13, and is power saving. That is, the fixed blade 61a is fixed to the turning portion 61, and it is not necessary to rotate the fixed blade 61a with a motor or the like, so that such electric power can be made unnecessary.

  The classifier 1 has a container 2 that houses the raw powder discharge part 6 and the suction part 4 and surrounds the outer periphery thereof, and an intake port for the bottom 22 that takes in the raw powder below the container 2 together with gas. A discharge transport pipe (processed raw powder transport mechanism 7) that feeds the raw powder and gas taken in from the intake to the raw powder discharge section 6 is provided. For this reason, the raw powder containing the fine powder deposited on the bottom portion 22 of the storage unit 2 due to the inhalation of the suction unit 4 can be discharged again from the raw powder discharge unit 6. Thereby, since the opportunity for the inhalation part 4 to inhale fine powder is newly provided, the collection rate of fine powder improves. In particular, by performing batch operations to perform “classification operation at the time of raw powder supply”, “pulverization classification operation of raw powder being processed”, and “collection operation of processed raw powder (coarse powder)” individually. Until the fine powder recovery rate reaches the desired recovery rate, the “pulverizing and classifying operation of raw powder during processing” can be executed, and a stable recovery rate can be realized.

  The classifier 1 is provided with a discharge port in the discharge transport pipe (the raw powder supply pipe 73 being processed by the processing raw powder transport mechanism 7), and the vicinity of the discharge port is used as the raw powder discharge unit 6, and the swivel unit 61 is a discharge transport. It is provided in the pipe. For this reason, the raw powder deposited on the bottom portion 22 in the storage unit 2 can be swung from the raw powder discharge unit 6 having the swivel unit 61 and discharged again. Thereby, since classification using the action of centrifugal force by turning is repeated, it is possible to improve the collection rate of fine powder while maintaining the accuracy of classifying fine powder and other than fine powder.

  The classifying apparatus 1 has a plurality of fixed portions in which the swivel unit 61 has a center on a straight line passing through the center of the raw powder discharge unit 6 and the center of the suction unit 4 and extends radially from the center and is inclined in the circumferential direction. It is formed by the blade 61a. For this reason, the raw powder transported to the raw powder discharge part 6 collides with the fixed blade 61 a of the swivel part 61. At that time, the clusters contained in the raw powder are crushed to separate at least a plurality of simple powders. Then, the separated fine powder is sucked by the suction part 4. Thereby, since the fine powder is newly generated and collected from the cluster that should be processed as the coarse powder, the collection rate of the fine powder is dramatically improved.

  The classifying device 1 is provided with distance changing means (position variable screw 4a provided in the fine powder discharge pipe 5) for changing the distance between the suction part 4 and the raw powder discharge part 6. For this reason, as described above, the accuracy of classifying fine powder and other than fine powder is improved, and the accuracy of classification is also improved.

  In the classifier 1, the container 2 has a substantially cylindrical shape with the center line facing the vertical direction, and is disposed along the tangential direction on the inner wall (swirl flow guide wall 21) of the container 2 near the suction part 4. A supply nozzle 3 for allowing powder to flow in with gas is provided. For this reason, classification is performed also when supplying raw powder to the classification apparatus 1, and the efficiency of classification is good.

  Moreover, since the opening 62 of the raw powder discharge | release part 6 and the opening 42 of the suction | inhalation part 4 are arrange | positioned so that a central axis may coincide with a similar shape (this example circular), it discharge | releases from the raw powder discharge | release part 6 The raw powder thus obtained can be stably sucked into the suction part 4 without unevenness. Therefore, particles (fine powder) of a desired size can be obtained by inhaling appropriately.

Note that the present invention is not limited to this embodiment, and may be various other embodiments.
For example, “classification operation at the time of raw powder supply”, “cracking classification operation of raw powder during processing”, and “collection operation of processed raw powder (coarse powder)” are batch processing, but all are performed simultaneously. It can be a process. Alternatively, “classification operation at the time of raw material supply” and “cracking classification operation of raw powder being processed” are first executed, and after the predetermined time has elapsed, “collection operation of processed raw powder (coarse powder)” is started, When a sufficient amount of raw powder is supplied to the container 2, the “classification operation when supplying raw powder” is temporarily stopped, and when the raw powder in the container 2 is reduced to a predetermined amount, “classification when supplying raw powder” The movement / stop of each part may be flexibly changed so that the “operation” is resumed.

  The raw powder (powder) classified by the classifier 1 is not limited to fly ash, and various powders (a plurality of particles having a difference in particle size or / and particle mass) such as wheat flour and cement. can do. Also in this case, it is possible to suitably crush and classify various raw powders.

  The present invention can be used in industries related to powder classification.

DESCRIPTION OF SYMBOLS 1 ... Classification apparatus 2 ... Storage part 3 ... Supply nozzle 4 ... Suction part 5 ... Fine powder discharge pipe 6 ... Raw powder discharge part 7 ... Processing raw powder transport mechanism 11 ... Raw powder silo 12 ... Bag filter 100 ... Classification system

Claims (4)

An unprocessed raw powder supply pipe for transporting the raw powder in an air stream,
A raw powder discharge part that discharges raw powder together with gas from the upper surface that is connected and opened above the raw powder supply pipe during processing ,
An inhalation part that is arranged to face the upper surface of the raw powder discharge part at a position spaced apart from the raw powder discharge part and sucks the raw powder and a part of the gas from the lower surface ;
The raw powder discharge part and the suction part are accommodated inside, the outer periphery is surrounded, and a container part for depositing the raw powder during classification or classification treatment is provided,
The raw powder discharge part has a swirl part having fixed blades inclined in the circumferential direction inside, and the swirl part swirls the raw powder supplied from the raw powder supply pipe during processing with the gas. It is a structure that discharges radially while turning from the upper surface that opens,
The classification device is configured to inhale the raw powder that is discharged radially from the open upper surface of the raw powder discharge section and advances while turning . The classification device according to claim 1 , wherein the classification unit is arranged such that a central axis of the raw powder discharge unit and a central axis of the suction unit coincide with each other . The classification device according to claim 1 or 2, further comprising distance changing means for changing the distance by fixing the suction part by changing a relative position with respect to the raw powder discharging part. A raw silo for storing raw flour,
A classification device according to claim 1, 2, or 3 ,
A raw powder transport mechanism for transporting the raw powder together with gas from the raw powder silo through the raw powder supply pipe to the classification device;
A fine powder discharge pipe connected to the suction portion of the classification device;
A bag filter for filtering and collecting fine powder from a gas containing fine powder discharged by the classifier through the fine powder discharge pipe;
Classification system with

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