KR102395420B1 - Powder classifier and classification system - Google Patents

Abstract

Provided are a classifier and a classifying system for simply and easily classifying powders such as flying ash. The raw material discharge unit 6 for discharging the raw material together with the gas, and the source material discharge unit 6 is disposed opposite to the source material discharge unit 6 at a position spaced apart from the source material discharge unit 6, inhalation for sucking the source material and a part of the gas A portion (4) is provided, and the raw material discharging unit (6) has a rotating unit (61) for rotating the raw material and the gas, and the source material discharging unit (6) and the inhalation unit (4) are installed therein. It has a receiving part 2 that receives and surrounds the outer periphery, and an inlet for blowing in the raw material below the receiving part 2 together with the gas, and blowing from this inlet to the raw material discharge part 6 and a conveying pipe for discharging the raw material and the gas.

Description

Powder classifier and classification system

This invention relates to a powder classification apparatus and a classification system.

Conventionally, a classification apparatus for classifying powder into particles having a size according to the use has been proposed.

As one of such classification apparatuses, a classifier which classifies by using the centrifugal force by rotation of a classification rotor is proposed (refer patent document 1). In this classifier, the introduction direction of the classification air is reversed to that of the prior art which opposes with respect to the rotation direction of a classification rotor. Thereby, it is described that a large separation force can be obtained by imparting a sudden change in the flow direction at the inlet of the rotary blade of the classification rotor, and higher-precision classification can be performed with a small number of rotations.

Moreover, a classifier has been proposed that classifies powder supplied to the outside of the classification rotor by being drawn inside the classification rotor based on the relationship between centrifugal force and centripetal force (see Patent Document 2). This classifier is characterized in that each rotary blade of the classifying rotor is disposed so as to be inclined with respect to the supporting member so that one supporting member side is closer to the rotational direction than the other supporting member side. It is described that the separation performance can be improved without raising the rotation speed of the classification rotor by this.

Japanese Patent Laid-Open No. 2001-353473 Japanese Patent Laid-Open No. 2005-342556

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

The present invention has been made in view of the above problems, and an object of the present invention is to provide a classifying apparatus and a classifying system for classifying powder with high precision with a simple and easy structure.

The present invention relates to a raw material supply pipe during processing for transporting raw material by loading it in an air stream, and a raw material discharge unit for discharging raw material together with gas from an upper surface that is opened and connected above the raw material supply pipe during the process; , an intake unit disposed opposite to the upper surface of the opening of the raw material emission unit at a position spaced apart from the source emission unit and sucking in from a lower surface opening a portion of the raw material and the gas; and a receiving portion for accommodating it in a periphery and depositing the raw material during or after the classification treatment, wherein the raw material discharge unit has a turning portion having a stator blade inclined in the circumferential direction therein, and from the raw material supply pipe during the treatment It is configured to rotate the supplied raw material together with the gas by the turning unit and radially discharge it while turning from the opening upper surface, and the intake unit is radially discharged from the opening upper surface of the raw material discharge unit and proceeds while turning It is characterized in that it is a classification device that is configured to suck the raw material.

According to the present invention, it is possible to provide a classifying device and a classifying system for classifying powder with high precision with a simple and easy structure.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the structure of a classification system.
It is explanatory drawing which shows typically the structure of a classification apparatus.
It is explanatory drawing explaining the structure of the vicinity of the raw material discharge|release part of a classification apparatus.
It is explanatory drawing explaining the operation|movement at the time of raw material supply and the time of pulverization classification.
It is explanatory drawing which shows typically the mode of classification at the time of the pulverization classification in the case where the position of a suction part is changed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

-<Example>-

＜Classification system＞

1 : is explanatory drawing which shows the structure of the classification system 100. As shown in FIG.

The classification system 100 includes a raw powder silo 11 that stores raw powder of flying ash, a classifier 1 that classifies raw powder, and filters and collects fine powder classified from the raw powder. a raw material transport mechanism 14 that includes a bag filter 12 that It has a fine powder conveyance piping 5a which connects the filter 12, and the fine powder conveyance mechanism 15 which conveys the fine powder collected by the bag filter 12 to a product silo (not shown).

The raw material transport mechanism 14 includes a rotary feeder 14a connected to an IN side to the bottom 11a of the raw flour silo 11, and an acceleration pipe connected to the OUT side of the rotary feeder 14a ( 14b), and a roots blower (13). The acceleration pipe 14b has an IN side connected to the roots blower 13 through a pipe 13a provided with an air valve 14c on the way, and an OUT side to the classifier 1 through a raw material supply pipe 14d. connected.

The raw material transport mechanism 14 performs the following operations during operation. First, the rotary feeder 14a starts, and quantitatively supplies raw material from the raw material silo 11 to the acceleration pipe 14b. Next, the air valve 14c is switched to the open state, and compressed air is blown from the roots blower 13 through the pipe 13a to the IN side of the acceleration pipe 14b. In addition, blowing is not limited to compressed air, As long as it is the compressed gas which compressed suitable gas, such as nitrogen, it does not matter. In the acceleration tube 14b, compressed air accelerates the flow rate, and disperses and floats the raw material in the acceleration tube 14b. Then, the raw powder is carried in the air stream, is discharged from the OUT side of the acceleration pipe 14b, and is transported to the classifying device 1 through the inside of the raw ingredient supply pipe 14d.

The classifier 1 classifies the raw material. In addition, the details of the operation will be described later. Moreover, as shown in the figure, the classification apparatus 1 may provide two units or a plurality of units in series, and thereby can realize higher performance classification.

The fine powder classified by the classifying device 1 is carried in an air stream, transported through the fine powder transport pipe 5a, and sent to a bag filter 12 .

The bag filter 12 includes a filter cloth 12b that filters and collects fines from the air stream accompanying fines, and a hopper 12c that collects fines that have been shaken off from the filter cloth 12b. are being prepared

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

When the fine powder transport mechanism 15 is in operation, the same operation as the raw powder transport mechanism 14 described above is performed. That is, the rotary feeder 15a starts, and quantitatively supplies fine powder from the hopper 12c to the acceleration pipe 15b. Next, the air valve 15c is switched to the open state, and compressed air is blown from the roots blower 13 through the pipe 13c to the IN side of the acceleration pipe 15b. In the acceleration tube 15b, compressed air accelerates the flow rate, and disperses and floats the fine powder in the acceleration tube 15b. Then, the fine powder is carried in the air stream, discharged from the OUT side of the acceleration pipe 15b, passed through the inside of the fine powder recovery pipe 15d, and transported to a product silo (not shown).

<Classifier>

2 : is explanatory drawing which shows typically the structure of the classification apparatus 1, FIG. 3 (A) is a cross-sectional view A-A of the classification apparatus, and FIG. 3(B) is the raw material discharge part 6 of the classification apparatus 1 is a longitudinal sectional view, and FIG. 3(C) is a perspective view of the classifier 1 in cross section B-B.

The classifying apparatus 1 is disposed opposite to the raw material discharge unit 6 for discharging the raw material together with air, and at a position spaced apart from the raw material discharge unit 6 to face the source material discharge unit 6 . A suction part 4 for sucking a part of the raw material and air emitted by the ), a processed raw material transport mechanism 7 for transporting raw flour during or after the classification process deposited on the bottom portion 22 is provided.

The raw material discharge unit 6 has a substantially cylindrical shape with a center line directed in the vertical direction, a substantially horizontal upper surface, a substantially circular opening 62, and a swirling portion 61 for turning the raw material and air therein. With this structure, the raw material and air supplied from the lower side are rotated in a clockwise direction in plan view by the turning part 61, and are radially discharged from the upper opening 62.

The raw material discharge part 6 is provided above the center of the inner space of the accommodating part 2, and is provided slightly above the center in this embodiment. Thereby, it is possible to deposit a large amount of raw material in the region below the raw material discharge unit 6 in the internal space of the accommodating portion 2 , and furthermore, in the region above the raw material discharge unit 6 , the suction unit 4 ) can classify the inhaled raw material.

As shown in Fig. 3(C), the turning portion 61 has a center on a straight line passing through the center of the raw material discharge portion 6 and the center of the intake portion 4, and extends radially from the center, Further, it is formed by a plurality of stator blades 61a inclined in the circumferential direction. In addition, although the turning part 61 is formed by the stator blade 61a of 3 sheets here, the stator blade 61a may just have multiple sheets, and 4 sheets, 6 sheets, or 8 sheets may be sufficient as it. In addition, although the turning part 61 is formed in one set by the three stator blades 61a here, it is a multiple type|mold which arrange|positioned a plurality of sets of three stator blades 61a at intervals on the center line (連式) (multi-stage type) may be formed.

Below the raw material discharge part 6, a cylindrical raw material supply pipe 73 passing through the central axis of the accommodating part 2 in the vertical direction is connected. During this process, the raw material supply pipe 73 is formed with a constant thickness with a smaller radius (ie, thinner) than the raw material discharge unit 6 , and changes the direction of 90° in the vicinity of the lower side of the receiving unit 2 to change the direction to the receiving unit. After projecting out of (2) and changing the direction downward, it is connected to the acceleration pipe 72 . A switching valve 73a is provided in the middle of the raw material supply pipe 73 during processing coming out of the accommodating part 2 .

The suction unit 4 has a substantially cylindrical shape with a center line oriented in the vertical direction, and an approximately horizontal and approximately circular opening 42 is provided on the lower surface thereof, and is located above the source discharge unit 6 and faces the source discharge unit 6 . placed towards. The suction part 4 is connected to the opposite side (that is, above) that does not face the raw material discharge part 6, and a fine powder discharge pipe 5 for discharging a part of the raw powder and air sucked by the suction part 4 is connected. .

The size of the opening 42 of the suction unit 4 is the same as the size of the opening 62 of the raw material discharge unit 6 . In addition, the size of the opening of the opening 42 of the inhalation unit 4 may be made larger than the opening 62 of the raw material discharging unit 6 or smaller than the opening 62 of the raw material discharging unit 6 , etc. It can be done with a suitable configuration.

In addition, the inhalation part 4 is formed in such a manner 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 raw material discharging part 6 . It is disposed perpendicularly upward from the surface and disposed so that the opening 42 of the inhalation unit 4 and the opening 62 of the raw material discharge unit 6 face each other. Accordingly, it is possible to appropriately adjust the particle size inhaled by the inhalation unit 4 among the raw material emitted from the raw material discharge unit 6 .

As for the fine powder discharge pipe 5, the lower part is connected to the suction part 4 in the suction part 4, the upper part is arrange|positioned outside the suction part 4, The raw material in the suction part 4 and air are classified. It functions as a discharge pipe that transports some of the replenishment to the outside.

The fine powder discharge pipe 5 is composed of a slidable double pipe (inner tube and outer tube), the outer tube is fixed to the accommodating 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 exterior from the outside, and the tip of the screw presses the outer peripheral surface of the inner tube to stop sliding of the inner tube, and the position variable screw 4a that can be fixed by changing the relative position of the inner tube and the outer tube ) is provided. Thereby, the relative positions of the suction part 4 connected to the inner tube, the accommodating part 2 fixed to the exterior, and the raw material discharge part 6 accommodated in the accommodating part 2 can be changed and fixed. That is, it is possible to change the distance D between the intake part 4 and the raw material discharge part 6 . In addition, the structure for changing the distance D between the suction part 4 and the raw material discharge part 6 is not limited to this, It can be set as an appropriate structure.

The accommodating part 2 is a substantially cylindrical container whose center line faces the vertical direction, and is formed in the shape of a longitudinal length larger than the radius of the raw material discharge part 6 . It is preferable that the radius of this accommodating part 2 is twice or more of the radius of the raw material discharge part 6, and it is formed about 3 times in this embodiment.

The accommodating portion 2 functions as a swirl flow guide wall 21 through which the cylindrical portion follows the swirl flow on the wall inner surface to flow. The swirl flow guide wall 21 is provided with a supply nozzle 3 (refer to Fig. 3(A) ) which goes straight along the tangential direction of the wall surface in the vicinity of the suction unit 4 . The raw material is supplied together with air into the accommodating part 2 from this supply nozzle 3 . In this embodiment, the supply nozzle 3 is arranged so that the raw material and air flowing into the swirl flow guide wall 21 rotate (turn) in the swirl flow guide wall 21 clockwise in plan view. As a result, in the swirl flow guide wall 21 , the raw powder and air supplied from the supply nozzle 3 are rotated in a planar rotation direction (turning direction) and the raw powder and air emitted from the raw powder discharge unit 6 are rotated in a planar view. It is comprised so that the rotation direction (turning direction) may correspond.

The raw material transport mechanism 7 includes a rotary feeder 71 connected to the IN side of the bottom 22 of the accommodating portion 2 , an acceleration tube 72 connected to the OUT side of the rotary feeder 71 , and , a root blower 13 (refer to FIG. 1) is provided. The acceleration pipe 72 has an IN side connected to the roots blower 13 (refer to Fig. 1) through a pipe 13b in which an air valve 74a is installed in the middle, and an OUT side is connected to the raw material supply pipe 73 during processing. It is connected to the raw material recovery pipe 75 after treatment. The raw material supply pipe 73 during processing is provided with a switching valve 73a on the way, and is connected to the raw material discharge part 6 . On the other hand, the post-treatment raw material recovery pipe 75 is provided with a switching valve 75a on the way and is connected to a product silo (not shown).

≪Classification operation when supplying raw material≫

Fig. 4(A) is an explanatory diagram schematically showing a state of classification at the time of supply of raw material.

When the raw material transport mechanism 14 (refer to FIG. 1 ) is operated, it passes the raw material supply pipe 14d and transports the raw material together with air to the supply nozzle 3 of the classifying apparatus 1 . The raw flour is then discharged from the supply nozzle 3 into the inside of the receiving portion 2 together with air, flows along the swirl flow guide wall 21, and falls while generating a swirl flow (see Fig. 3(A)). ). Centrifugal force is applied to the raw material by this swirling flow. At this time, the fine powder FA1 (refer to Fig. 4(A)) in the raw flour has a small mass, so the action of centrifugal force is weak, and a part thereof is sucked into the suction unit 4 together with air from the swirl flow guide wall 21 . On the other hand, the remaining raw material FA2 gradually descends by the action of gravity while turning along the swirl flow guide wall 21, and is deposited on the bottom portion 22 (refer to Fig. 4(B)) of the accommodating portion 2 . do. When a certain amount of raw material is supplied into the container 2 , the raw material transport mechanism 14 (refer to FIG. 1 ) is stopped, and the supply of the raw material to the classifying device 1 is stopped.

≪Operation of disintegration and classification of raw flour during processing≫

Fig. 4(B) is an explanatory diagram schematically showing the state of pulverization and classification of raw flour during processing.

The raw material transport mechanism 14 (refer to Fig. 1) is stopped to stop the raw material supply to the classifying device 1, and the processed raw material transport mechanism 7 is operated as follows, and the classifying device 1 is In the inside, circulation transport of the treated raw material treated by classification is started at the time of supply. In addition, the stopping of the raw material transport mechanism 14 and the operation of the processing raw material transport mechanism 7 are not limited to being performed simultaneously, and one may be performed first and the other may be performed later. Here, even if there is a moment in which both are operating in the order of starting the raw powder transport mechanism 7 and then stopping the raw ingredient transport mechanism 14, the raw flour supply and classification are respectively appropriately performed. That is, since the supply nozzle 3 is provided at a position away from the discharge direction of the raw material and air of the supply nozzle 3 , most of the raw material supplied from the supply nozzle 3 is sucked into the suction unit 4 . Falling with nothing to do Since only fine particles of a size that are classified and sucked into the suction unit 4 are sucked into the suction unit 4, the classification performance is not affected.

First, the rotary feeder 71 is started, and raw material accumulated on the bottom 22 of the accommodating part 2 is quantitatively supplied to the acceleration pipe 72 during processing. Next, the air valve 74a is switched to the open state (see Fig. 2), and on the IN side of the acceleration pipe 72, compressed air is supplied from the roots blower 13 (see Fig. 1) through the pipe 13b. is blown In addition, blowing is not limited to compressed air, It does not matter if it is the compressed gas which compressed gas, such as nitrogen. In the acceleration tube 72 , the compressed air accelerates the flow rate, and disperses and floats the raw material in the acceleration tube 72 . The raw material is carried in the air stream and discharged from the OUT side of the acceleration tube 72 . At this time, the switching valve 73a installed in the raw material supply pipe 73 during processing is opened, and the switching valve 75a installed in the raw material recovery pipe 75 after processing is set to a closed state. Thereby, the raw material is carried in the air stream, and it is conveyed to the raw material discharge part 6 through the inside of the raw material supply pipe 73 during processing.

The raw powder transported to the raw powder discharge part 6 contains fine powder and coarse powder which remain without being sucked by the suction part 4 in the classification operation at the time of raw material supply. Fine powder is a particle with a small particle size. In coarse powder, in addition to particles with large particle diameters (true coarse powder), a plurality of small particle diameter particles (fine powder) are combined with weak bonding force to form a cluster-like mass, but a plurality of fine particles around true coarse powder have weak bonding strength. It contains clusters such as those that combine to form a mass.

The raw material transported from the raw material supply pipe 73 to the raw material discharge unit 6 during processing is carried in an air stream, and moves straight upward (vertically upward) in the centerline direction of the raw material discharge unit 6, and the revolving unit 61 It collides with the stator blades 61a forming a (see FIG. 3(B)). Due to this collision, many of the clusters are disintegrated, and a plurality of individual fines are separated. In this way, the raw flour transported to the raw material discharging unit 6 is composed of fine powder newly generated by pulverization in addition to the above-mentioned remaining fine powder, and the remaining clusters and true coarse powder without being completely disintegrated.

The air stream loaded with these fine powders, clusters and true coarse powder is rotated around the center line of the raw powder discharge unit 6 by a plurality of stator blades 61a that expand radially from the center and are inclined in the circumferential direction. It becomes a swirling flow going straight in the direction of the centerline, and is discharged radially upward into the space while turning from the opening 62 . Since the fine powder has a small mass, it is not so affected by the centrifugal force of the swirling flow. For this reason, the differential FB1 advances while turning in the centerline direction or the direction slightly inclined from the centerline direction, and is sucked by the suction part 4 (refer FIG.4(B)). On the other hand, since the clusters and true coarse powder remaining without being completely disintegrated have a large mass, they are greatly affected by centrifugal force. For this reason, the cluster FB2 and the true coarse powder FB3 proceed while turning in a direction close to the radial direction greatly deviating from the centerline direction, and then, while turning along the swirl flow guide wall 21, gradually descend by the action of gravity and receive It is deposited again on the bottom part 22 of the part 2 .

As described above, the remaining fine powder and fine powder separated by the disintegration of clusters are sucked in by the suction unit 4 , and the clusters and coarse coarse powder are again collected at the bottom of the accommodating unit 2 . By depositing in (22), the classification of the raw material is performed.

The clusters and true coarse powder deposited on the bottom 22 of the container 2 circulate in the classifier 1 by continuously operating the raw material transport mechanism 7 , and go to the raw material discharge part 6 several times. can even be transported. As described above, the clusters transported to the raw material discharging unit 6 are disintegrated to separate fine powders anew and become smaller clusters. Then, the newly separated fine powder or the fine powder remaining without being sucked is sucked in by the suction unit 4 . By continuously operating the raw material transport mechanism 7 in this way, the disintegration can be repeated any number of times until the cluster ceases to be a cluster, and the pulverization can be repeated until the fine powder contained in the raw flour is almost absorbed. As a result, most of the fine powder existing as a cluster is finally separated, and is sucked and recovered by the suction unit 4 . For this reason, the recovery rate of fine powder can be improved.

It is explanatory drawing which shows typically the mode of classification at the time of the pulverization classification in the case where the position of a suction part is changed.

As described above, it is possible to change the distance between the suction unit 4 and the raw material discharge unit 6 by changing the position of the suction unit 4 using the variable position screw 4a installed in the fine powder discharge pipe 5 . will do For example, when the position of the suction unit 4 is set to P2 and the distance between the suction unit 4 and the raw material discharge unit 6 is set to be short D2, not only the differential FB1 but also some small clusters , there is a risk of being sucked into the suction unit 4 . However, as the position of the suction unit 4 is set to P1 and the distance between the suction unit 4 and the raw material discharge unit 6 is increased to D1 (the gap is widened), only the differential FB1 is obtained from the suction unit 4 Inhalation becomes possible. Thereby, the accuracy of classifying the differential and non-differential is improved. As described above, by widening the distance D between the inhaling unit 4 and the raw material discharging unit 6, only finer particles can be sucked in the inhaling unit 4, and conversely, the inhaling unit 4 and the raw material discharging unit 6 are By narrowing the interval D, it is possible to suck in the suction unit 4 including coarser particles. Therefore, by adjusting the distance (interval) between the suction part 4 and the raw material discharge part 6, it becomes possible to adjust the maximum particle diameter of the fine powder sucked by the suction part 4, and the precision of classification improves.

≪Operation of recovery of raw flour (coarse flour) after treatment≫

When recovering the raw flour (coarse flour) after treatment, the raw flour transport mechanism 7 is temporarily stopped, and the circulating supply of the raw flour to be treated in the classifying device 1 is stopped (refer to FIG. 2 ). Then, the switching valve 73a installed in the raw material supply pipe 73 during processing is switched to a closed state, and the switching valve 75a installed in the raw material recovery pipe 75 after processing is switched to an open state. Then, by restarting the treated raw material transport mechanism 7 , the treated raw flour (coarse flour) is carried in an air stream, passed through the treated raw material recovery pipe 75, and transported to a product silo (not shown).

According to the above structure and operation, the classifier 1 can classify powder with high precision with a simple and easy structure.

In detail, the classifying device 1 is disposed opposite to the raw material discharge unit 6 for emitting all of the raw material while swirling the gas, and at a position spaced apart from the source emission unit 6 to face the raw material discharge unit 6, The intake part 4 for sucking in a part of the powder and gas is provided, and the raw powder discharge part 6 has a turning part 61 for turning the raw powder into gas. For this reason, the raw material rotates in the raw material discharge part 6 . Thereby, it receives the action of a centrifugal force of a different magnitude other than the differential and the differential which perform a turning motion. Then, the fine powder having a small action of centrifugal force is absorbed by the suction unit 4 disposed opposite to the raw material discharging unit 6 at a position separated from the raw material discharging unit 6 . In this way, raw flour can be classified into fine powder and other than fine powder using the classifier 1 of a simple and easy structure.

Moreover, the main thing of electric power required is electric power for operating the roots blower 13, and electric power is saved. That is, since the stator blade 61a is fixed to the turning part 61 and it is not necessary to rotate the stator blade 61a with a motor etc., such electric power can be made unnecessary.

The classifying device 1 includes an accommodating part 2 which accommodates the raw material discharge part 6 and the inhalation part 4 inside and surrounds the outer periphery, and blows the raw powder below the accommodating part 2 together with gas ( A discharging conveying pipe (processed raw material transport mechanism 7) having an intake port of the bottom portion 22 to be blown, and discharging raw material and gas blown from the intake port to the raw material discharge unit 6 . ) is provided. For this reason, the raw material containing the fine powder accumulated on the bottom part 22 of the accommodating part 2 due to the suction part 4 erroneously sucking can be discharged from the raw material discharge part 6 again. Thereby, since the opportunity for the suction part 4 to suck in fine powder is provided again, the recovery rate of fine powder improves. In particular, the recovery rate of fine powder by performing batch processing in which "classification operation at the time of raw material supply", "disintegration and classification operation of raw material during processing", and "recovery operation of raw material (coarse flour) after treatment" are individually performed Until this desired recovery rate is reached, "disintegration and classification operation of raw material during processing" can be performed, and a stable recovery rate can be realized.

The classification apparatus 1 provides a discharge port in the discharge conveying pipe (the raw material supply pipe 73 during processing of the processed raw material conveyance mechanism 7), the vicinity of the discharge port serves as the raw material discharge unit 6, and turns The part 61 is provided in the conveyance pipe for discharge|emission. For this reason, the raw material deposited on the bottom part 22 of the accommodating part 2 can be rotated from the raw material discharge part 6 having the turning part 61 and discharged again. Thereby, since classification using the action of centrifugal force by turning is repeated, the recovery rate of fine powder can be improved, maintaining the accuracy of classifying fine powder and other than fine powder.

In the classifying apparatus 1, the turning part 61 has a center on a straight line passing through the center of the raw powder discharge part 6 and the center of the inhalation part 4, and extends radially from the center, and also circumferentially It is formed by the plurality of stator blades 61a inclined in the direction. For this reason, the raw powder transported to the raw material discharge part 6 collides with the stator blade 61a of the turning part 61. As shown in FIG. At this time, the clusters included in the raw flour are disintegrated to separate at least a plurality of single-piece fines. Then, the separated fine powder is sucked by the suction unit 4 . Thereby, since the fine powder is newly generated and recovered from the cluster which is originally to be treated as coarse powder, the recovery rate of the fine powder is greatly 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 unit 4 and the raw material discharge unit 6 . For this reason, as described above, the accuracy of classifying the differential and non-differential is improved, and the precision of the classification is also improved.

In the classifying apparatus 1, the accommodating part 2 has a substantially cylindrical shape with a center line oriented in the vertical direction, and is tangential to the inner wall (the swirling flow guide wall 21) of the accommodating part 2 in the vicinity of the suction part 4 . It has a supply nozzle (3) arranged along the and for introducing the raw material together with the gas. For this reason, also when supplying raw material to the classifier 1, classification is performed, and the efficiency of classification is good.

Further, since the opening 62 of the raw material discharging unit 6 and the opening 42 of the inhaling unit 4 are disposed in a similar shape (circular in this embodiment) and so that their central axes coincide with each other, the raw material discharging unit 6 ) can be stably sucked into the suction unit 4 without bias. Accordingly, it is possible to appropriately inhale particles (fine powder) of a desired size.

In addition, this invention is not limited to this embodiment, It can be made into other various embodiment.

For example, "classification operation at the time of raw material supply", "disintegration and classification operation of raw material during processing", and "operation of recovering raw material (coarse) after treatment" are batch processing, but all of them are continuously executed at the same time It can be done by processing. Alternatively, the "classification operation at the time of raw material supply" and the "disintegration classification operation of raw material during processing" are first performed, and after a predetermined time has elapsed, the "recovery operation of raw material (coarse meal) after treatment" is started, and on the other hand, the receiving unit When a sufficient amount of raw material is supplied to (2), the "classification operation during raw material supply" is temporarily stopped. You may flexibly change the start/stop of each part as you do.

In addition, the raw flour (powder) classified by the classifying device 1 is not limited to fly ash, and various powders such as wheat flour and cement (a plurality of particles having different particle sizes and/or particle masses). can be In this case as well, it is possible to suitably pulverize and classify various raw materials.

<Industrial Applicability>

INDUSTRIAL APPLICATION This invention can be used for the industry related to the classification of powder.

One… Classifier 2... receptacle
3… Feed nozzle 4… suction part
5… Differential powder discharge pipe 6… raw material release
7… processing raw material transport apparatus
11… Raw material silo 12… bag filter
100… classification system

Claims (4)

The raw material supply pipe during the process of transporting the raw material by loading it in the air stream,
a raw material discharging part connected to the upper side of the raw material supply pipe during the treatment and discharging the raw material together with the gas from the upper surface opened;
a suction unit disposed opposite to the upper surface of the opening of the source discharge unit at a position spaced apart from the source discharge unit and sucking in from a lower surface opening a portion of the raw material and the gas;
and a accommodating part for accommodating the raw material discharging part and the inhaling part inside, enclosing an outer periphery, and depositing the raw material during or after the classification process;
The raw material discharging unit has therein a turning unit having fixed blades inclined in the circumferential direction, the opening is located above the fixed blade, and the raw material supplied from the raw material supply pipe during the processing is transferred together with the gas to the rotating unit It is configured to be rotated by the stator blade and discharged to the upper space radially while turning from the upper surface that opens above the stator blade,
and the suction unit is configured to suck the raw material which is discharged radially from the upper surface of the opening of the raw material discharge unit and rotates while moving. According to claim 1,
A classifying device disposed so that a central axis of the opening of the raw material discharging unit coincides with a central axis of the opening of the inhaling unit. According to claim 1,
A classification device provided with a distance changing means for changing the distance between the suction unit and the raw material discharge unit by changing the relative position thereof and fixing it. a raw material silo for storing raw material;
The classifying device according to claim 1, 2, or 3;
a raw material transport mechanism for transporting the raw material together with a gas from the raw material silo to the classifying device through a raw material supply pipe;
a fine powder discharge pipe connected to the suction part of the classifier;
and a bag filter for filtering and collecting fine powder from the gas containing fine powder discharged by the classifying device through the fine powder discharge pipe.

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