JP2019084478A - Air separator - Google Patents

Abstract

To provide an air separator capable of improving classification accuracy in the separation of contaminants contaminated in a granular material from the granular material by an air stream.SOLUTION: An air separator where a baffle cylinder 2 is disposed at an intermediate part in a separator body 1 having an exhaust port 11 at an upper part and a material discharge port 12 at a lower edge and a first annular space 30 is constituted around the same includes: material supply means supplying a granular material g containing a coarse froth f and a powdery froth p into the first annular space 30 with primary air A1 in a tangential direction; secondary air introduction means introducing secondary air A2 into a lower space 32 in the separator body 1; and a swirling direction reversal mechanism 6 having an inner cylinder 61 disposed at an upper part in the separator body 1 and a plurality of louver plates 62 which are disposed so as to have mutual intervals D in a second annular space 31d formed around the inner cylinder 61 and where an air stream flowing in the second annular space 31d rises spirally while circling in a clockwise direction R2 being a reverse direction to a counterclockwise direction R1.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an air stream separation apparatus for separating particulate material and light impurities mixed in the particulate material by means of an air stream.

  In general, granular materials such as synthetic resin pellets used for resin molding raw materials such as injection molding are often transported by air through piping, but contamination with foreign substances (foreign matter) called floss occurs during transport. Unavoidable. The floss mainly consists of the resin component attached to the inner wall of the tube growing by contact friction to form a film-like film, and the film is exfoliated in the form of a string or thread, but in addition to this, fine particles of the film And powdery substances produced by collision of pellets, abrasion with the inner wall of the tube, etc. are also factors that cause various problems. For example, since floss is much easier to melt morphologically or in size than pellets, in resin molding using pellets containing floss, the previously melted floss is thermally degraded until the pellets are melted and the quality of the molded product is degraded And yield decrease. In addition, when the type of resin to be transported is changed, the floss of the resin component before peeling off from the inner wall of the tube is mixed as an impurity, which also leads to the deterioration of the quality of the molded product. Furthermore, the floss may get caught in the rotary valve or the like to cause malfunction or clogging.

  Therefore, as a technique for solving the above problem, an air flow separating device as described in Patent Document 1 has been proposed. This air stream separation device feeds the floss-containing pellets delivered from the air transport pipe together with the air flow into the vertical cylinder whose diameter is reduced at the bottom as a floss separator for separating floss from pellets, and spirals in the vertical cylinder And a light floss with the air flow to the upper exhaust port while a heavy pellet is dropped by its own weight to the lower outlet port.

JP, 2010-188275, A

  By the way, although the above-mentioned conventional air flow separation device can separate and remove light contaminants mixed in granular material such as synthetic resin pellets by air flow, the height of the separator main body (the restriction of the installation place etc. If the length in the vertical direction can not be sufficiently secured, the height of the upper space in the separator body is lowered, whereby the air flow velocity is sufficiently reduced when the pellet ascends the upper space with the air flow. Without it, there was a possibility that the air flow rate would not be lower than the floating speed of the pellet. As a result, the pellet may not be dropped to the lower outlet, but may be discharged from the upper outlet together with the floss, so that the classification accuracy in which the pellet and the floss mixed in the pellet are separated by the air flow There was a problem that could decrease.

  Then, in view of the above-mentioned situation, an object of the present invention is to provide an air flow separation device which can improve classification accuracy which separates granular material and light impurities mixed in granular material by air flow.

  In the present specification, the expressions "heavy" and "light" are not specific gravity as the physical quantity of the object, but represent the degree of floatability due to wind pressure from below, and even materials having the same specific gravity have particle size and bulk density The smaller the is, the lighter the more susceptible to air resistance.

  The object of the present invention is achieved by the following means. In addition, although the inside of a parenthesis attaches the referential mark of embodiment mentioned later, this invention is not limited to this.

The air stream separation device according to the invention of claim 1 comprises a vertical cylindrical separator body (1) provided with an exhaust port (11) at the top and a material outlet (12) at the lower end;
A longitudinal short cylindrical baffle cylinder (2) having a closed upper end and a lower end disposed concentrically in the separator body (1);
A first annular space (30) communicating with upper and lower spaces (31, 32) in the separator body (1) formed around the baffle cylinder (2);
A material supply port (13a) provided in the peripheral wall portion of the separator body (1) facing the first annular space (30);
A particulate material (g) containing impurities (coarse floss (f), powdery floss (p), and the first annular space (30) from the material supply port (13a) along with the air flow of the primary air (A1) Material feeding means (material feeding pipe (13), blower (B1)) for feeding tangentially inward;
Secondary air introducing means (blower (B2), secondary air introducing pipe (4)) for introducing secondary air (A2) into the separator body (1);
A pivoting direction reversing mechanism (6) disposed at the top in the separator body (1);
A particulate material (g) containing impurities (coarse floss (f), powdery floss (p)) fed into the separator body (1) from the material supply port (13a) is the primary air (A1). And the secondary air (A2), and is configured to rise in a spiral while circling the first annular space (30) in a first direction (counterclockwise direction (R1)),
The turning direction reversing mechanism (6) includes a cylindrical inner cylinder (61) concentrically disposed at an upper portion in the separator main body (1), and a cylindrical inner cylinder (61) formed around the inner cylinder (61) A second direction which is disposed in the two annular spaces (31d) at a distance from each other, and the air flow flowing in the second annular space (31d) is opposite to the first direction (counterclockwise direction (R1)) And a plurality of louver plates (62) provided so as to spirally ascend in a clockwise direction (R2).

  In the air flow separating device according to the second aspect of the present invention, in the air flow separating device according to the first aspect, the plurality of louver plates (62) are configured such that the granular material (g) collides and falls. And the gap (62d) having a gap (D) through which the contaminants (coarse floss (f), powdery floss (p)) can pass upward from the bottom is configured to be configured. It is characterized by becoming.

  Next, the effects of the present invention will be described with reference to the drawings. In addition, although the inside of a parenthesis attaches the referential mark of embodiment mentioned later, this invention is not limited to this.

  According to the invention of claim 1, the cylindrical inner cylinder (61) disposed concentrically in the upper part in the separator body (1) and the second annular space formed around the inner cylinder (61) A second direction (clock) is disposed at an interval (D) to each other at (31d), and the air flow flowing in the second annular space (31d) is opposite to the first direction (counterclockwise direction (R1)). Since the turning direction reversing mechanism (6) having a plurality of louver plates (62) provided so as to rise in a spiral while rotating in the turning direction (R2)) is provided, the installation location is limited, etc. If the height of the separator body (1) can not be secured sufficiently, that is, when the granular material (g) ascends the upper space (31) with the air flow, the air flow velocity does not sufficiently slow, and the air Even if the flow velocity is not lower than the floating velocity of the granular material (g) The air flow flowing through the lower space (31a) of the upper space (31) rises spirally while circulating in the first direction (counterclockwise direction (R1)), and the plurality of louver plates (62) In the second annular space (31d), the second direction (clockwise direction (R2)) in which the air flow in the second annular space (31d) is opposite to the first direction (counterclockwise direction (R1)) The air flow flowing through the second annular space (31d) is sufficiently decelerated so that the air flow velocity becomes lower than the floating velocity of the granular material (g). As a result, the granular material (g) easily falls to the material outlet (12) at the lower end, and only the impurities (coarse floss (f), powdery floss (p)) form the second annular space (31 d). It passes through and becomes easy to be discharged from the upper exhaust port (11). Therefore, according to the present invention, classification accuracy for separating particulate material (g) and contaminants (coarse floss (f), powdery floss (p)) mixed in particulate material (g) by air flow is used. It can be improved.

  Furthermore, according to the invention of claim 1, by providing the turning direction reversing mechanism (6), the height of the separator body (1) can be lowered. As a result, the air stream separation device can be made compact, and air flow stagnation in the upper space (31) in the separator main body (1) is less likely to occur, so foreign matter (coarse floss (f), powder floss (floss) p)) will be discharged from the exhaust port (11) without stagnation, thereby eliminating the cause of contamination.

  Further, according to the invention of claim 2, the plurality of louver plates (62) are configured such that the granular material (g) collides and falls, and the foreign matter (coarse floss (f), powdery floss Since the gap (62d) having a gap (D) through which (p) can pass from the bottom to the top is arranged, the granular material (g) is formed of a plurality of louver plates (62) Collide with the air, forcefully descend by inertia force, and fall to the material outlet (12) at the lower end, and the foreign substances (coarse floss (f), powdery floss (p)) are plural louver plates (62) It passes from the lower side to the upper side from the lower gap (62d) and is discharged from the upper exhaust port (11), so that the particulate material (g) and the contaminants (g) mixed in the particulate material (g) Separation of coarse floss (f) and powdered floss (p) by air flow The classification precision can be further improved that. Furthermore, according to the second aspect of the invention, frequent occurrence of clogging when providing a perforated plate made of punching metal is eliminated, so that cleaning becomes easy and the granular material (g) and the granular material ( It is possible to further improve the classification accuracy in which the contaminants (coarse floss (f), powdery floss (p)) mixed in g) are separated by air flow.

It is a principal part fracture front view of the whole air separation device concerning one embodiment of the present invention. It is a cross section arrow line view of the XX line of FIG. It is a cross-sectional arrow line view of the YY line of FIG. It is a longitudinal front view which shows typically the separation state of the granular material and the light foreign substances by the same airflow separation apparatus. It is a cross-sectional arrow line view of the ZZ line of FIG. It is a principal part longitudinal front view which shows typically the isolation | separation state of the granular material and the light foreign material by the same airflow separation apparatus.

  Hereinafter, an embodiment of an air flow separation device according to the present invention will be specifically described with reference to the drawings. As shown in FIG. 1, the air flow separating device is disposed concentrically in the longitudinal short cylindrical separator body 1 whose upper end is closed by the end plate 1 a and the height direction intermediate portion in the separator body 1. A rotary valve integrally connected to the lower end of the separator main body 1 and the secondary air introduction pipe 4 plunging from the outside into the reduced diameter lower portion 1b of the separator main body 1 5 and a pivoting direction reversing mechanism 6 disposed at the top in the separator body 1.

  As shown in FIG. 1, the separator main body 1 is provided with an exhaust port 11 opened to the side of the upper part above the turning direction reversing mechanism 6, and the lower end facing the rotary valve 5 constitutes a material outlet 12 The material supply pipe 13 along the tangential direction is integrally provided on the outer periphery of the height direction intermediate portion. A first annular space 30 is formed between the inner periphery of the separator main body 1 and the outer periphery of the baffle cylinder 2 at the middle in the height direction, and the upper space 31 is formed via the first annular space 30. And the lower space 32 communicate with each other. The material supply port 13 a of the material supply pipe 13 is opened at a position close to the upper portion of the first annular space 30 so that the material supply direction is tangential to the first annular space 30. Incidentally, as shown in FIG. 1, the primary air A1 is fed from the material supply port 13a of the material supply pipe 13, and this primary air A1 is, as shown in FIGS. 2 and 4, the first annular space 30. It flows and spirals up while circling in the counterclockwise direction R1.

  As shown in FIG. 1, both ends of the cylindrical portion 20 are closed by the conical upper and lower end portions 21 and 22 as shown in FIG. 1, and as shown in FIG. The plurality of (three in FIG. 2) mounting projections 23 equally spaced on each other are attached to the respective supporting projections 14 provided on the inner periphery of the separator body 1 via bolts and nuts 24. ing.

  As shown in FIG. 1, the secondary air introduction pipe 4 penetrates the peripheral wall of the lower portion 1 b of the separator body 1 from the outside, and is bent upward at a central position in the separator body 1; A porous cap 41 made of punching metal is fitted to the upper end of the tube main body 40, and a large number of punch holes of the porous cap 41 constitute an outlet 4a of the secondary air A2. The tube main body 40 of the secondary air introduction tube 4 is fixed by welding at a portion passing through the peripheral wall portion of the separator main body 1, and as shown in FIG. The discharge port 4 a is fixed so as to be disposed at the center of the separator main body 1 by a plurality (four in FIG. 3) of horizontal support pieces 42 bridged by being equally distributed in the circumferential direction with the inner circumference. .

  As shown in FIG. 1, the rotary valve 5 includes a plurality of (four in FIG. 1) vanes 5a radially disposed around a horizontal rotation axis, and is rotated upward by a motor or the like to face upward. A granular material g (see FIG. 4), such as synthetic resin pellets, dropped from the material outlet 12 of the separator main body 1 is accommodated between the slats 5a, and the outlet opens downward when it turns downward. Particulate material g is discharged from 5b, but it is always air-locked between the material outlet 12 and the outlet 5b with the slat 5a during the rotational drive and stop.

  As shown in FIGS. 1, 5 and 6, the turning direction reversing mechanism 6 is formed around the outer periphery of the cylindrical inner cylinder 61 concentrically arranged at the upper part in the separator main body 1 and the inner cylinder 61. A plurality of louver plates 62 arranged at intervals D (see FIG. 6) in the second annular space 31d to be separated, and flanges provided on the outer peripheral portion of the separator body 1 integrally with bolts and nuts. And a flange portion 63 for connection. As shown in FIG. 5, the flange portion 63 has a plurality of (12 in FIG. 5) through holes for bolt insertion equally spaced in the circumferential direction.

  The inner cylinder 61 is, as shown in FIGS. 1 and 4 to 6, a vertically short cylindrical one whose upper and lower ends are formed so as to open in a circular shape, and via the plurality of louver plates 62, It is concentrically fixed at the top in the separator body 1.

  The louver plate 62 is, as shown in FIGS. 5 and 6, arranged in parallel with a plurality of (eight in FIG. 5) metal vanes inclined and spaced apart from each other. The granular material g is configured to collide with and fall on the lower surface 62c (see FIG. 6), and the light contaminants such as coarse floss f and powdery floss p can pass a distance D upward from below. It is arrange | positioned so that the clearance gap 62d which has may be comprised. Then, as shown in FIG. 6, the plurality of louver plates 62 are disposed in parallel so that the intervals D are equal to each other, so that the large floss f and the powder floss p do not clog. It is arranged. Furthermore, as shown in FIG. 6, the plurality of louver plates 62 are arranged in parallel such that the upper end 62a and the lower end 62b have the same height, and the inclination angle is, for example, 45 degrees. It is disposed to be inclined, and as shown in FIG. 5 and FIG. 6, the inclination direction is disposed to be inclined in a rising direction toward the clockwise direction R2. Thus, as shown in FIG. 6, the air flow flowing through the lower space 31a of the upper space 31 spirally rising while circling in the counterclockwise direction R1 vertically collides with the lower surfaces 62c of the plurality of louver plates 62. As a result, the air flow flowing in the second annular space 31d is spirally raised while being circulated in the clockwise direction R2 opposite to the counterclockwise direction R1.

  Thus, in order to separate and remove light impurities such as coarse floss f and powdery floss p from the granular material g by the air stream separating apparatus constructed as described above, as shown in FIG. The transport pipe L is connected, and the material M loaded in the hopper type tank T is carried on the primary air A1 fed from the blower B1 of the material feeding means and fed through the air transport pipe L and the material feeding pipe 13 It feeds continuously into the 1st annular space 30 in the separator main body 1 from the opening 13a. At the same time, the secondary air A2 supplied from the blower B2 of the secondary air introducing means is continuously transmitted upward from the central portion of the lower space 32 in the separator body 1 from the discharge port 4a through the secondary air introducing pipe 4 Release.

  The material M fed into the first annular space 30 from the above material supply port 13a is a mixture of granular material g to be recovered with coarse floss f and powdery floss p which are light contaminants to be separated and removed. The primary air A1 as the transport medium and the secondary air A2 blown up from below ride on the first annular space 30 and reach the upper space 31 in the separator body 1. At this time, the primary air A1 fed from the material supply port 13a flows tangentially into the first annular space 30, and the annular shape of the first annular space 30 forces the flow along the circumferential direction. (1) Since the flow velocity is high in the annular space 30, a strong spiral rising flow is generated together with the secondary air A2 blown up from below, and a stable spiral rising flow is maintained even in the upper space 31 .

  By the way, the place where the feature of this embodiment is characterized in that the turning direction reversing mechanism 6 is disposed at the upper part in the separator main body 1, as shown in FIG. By arranging the reversing mechanism 6, a stable spiral upward flow, that is, coarse floss f flowing in the lower space 31a of the upper space 31 spirally rising while circulating in the counterclockwise direction R1, powder floss The air flow containing p, granular material g flows into the second annular space 31 d formed on the outer periphery of the inner cylinder 61 and, as shown in FIG. 5 and FIG. And slow down enough. As a result, when the air flow velocity is lower than the floating velocity of the particulate material g, the particulate material g is easily dropped. At this time, when the granular material g collides with the lower surfaces 62c of the plurality of louver plates 62, the granular material g falls vigorously with inertia force, that is, falls surely, and coarse floss f, powder flowing in the second annular space 31d The air flow including the circular floss p spirally rises while circling in the clockwise direction R2 opposite to the counterclockwise direction R1 and flows into the upper space 31b of the upper space 31 as shown in FIG. The air is discharged from the exhaust port 11 opened to the side of the upper portion in the separator body 1. However, while the particulate material g falls as the primary separation zone Z1, loose coarse floss f and powdery floss p are discharged from the exhaust port 11.

  In addition, although coarse floss f mainly composed of powdery floss p and a part of powdery floss p are attached to the granular material g in many cases, the granular material g falling from the primary separation zone Z1 has a first annular shape. When passing through the space 30, there is a strong stirring action due to the collision between the circumferential flow of the primary air A1 fed from the material supply port 13a and the upward flow of the secondary air A2 from below. Thereby, in the first annular space 30, as the secondary separation zone Z2, the coarse floss f and the powdery floss p adhering to the falling granular material g are easily separated and the air A (primary air rising) The air is carried upward by A1 + secondary air A2) and discharged from the exhaust port 11, and only the particulate material g is lowered to reach the lower space 32. Then, since the upward flow of the secondary air A2 is weak in the lower space 32 with a large flow passage area, there is no concern that the granular material g reaching the lower space 32 will turn to the upward again, and the material discharge port 12 at the lower end is surely It falls and is taken out from the outlet 5b by the rotational drive of the rotary valve 5.

  Therefore, according to the present embodiment, since the turning direction reversing mechanism 6 is disposed at the upper part in the separator main body 1, sufficient height of the separator main body 1 can be secured by the restriction of the installation place or the like. If the air can not be reduced, that is, when the particulate material g ascends the upper space 31 with the air flow, the air flow velocity does not sufficiently slow and the air flow velocity does not fall below the floating velocity of the granular material g. The air flow flowing through the lower space 31a 31 rises in a spiral while rotating in the counterclockwise direction R1, and the plurality of louver plates 62 of the turning direction reversing mechanism 6 function as a baffle of the air flow, Since the air flow flowing in the second annular space 31 d rises in a spiral while circling in the clockwise direction R 2 opposite to the counterclockwise direction R 1, the air flow flowing in the second annular space 31 d sufficiently decelerates And The air flow rate is lower than the floating speed of the granular material g, so that the granular material g tends to fall to the material outlet 12 at the lower end, while only the coarse floss f and the powdery floss p are the second annular space. The air passes through 31 d and is easily discharged from the upper exhaust port 11. Therefore, according to the present embodiment, it is possible to improve the classification accuracy in which the granular material g and the coarse floss f and the powdery floss p mixed in the granular material g are separated by air flow.

  Furthermore, according to the present embodiment, by providing the turning direction reversing mechanism 6, the height of the separator main body 1 can be lowered, whereby the air flow separating device can be made compact. Furthermore, since it is difficult for air flow to be generated in the upper space 31 in the separator main body 1, the coarse floss f and the powdery floss p are discharged from the exhaust port 11 without stagnation, so contamination ( The cause of contamination can be eliminated.

  Furthermore, according to the present embodiment, the plurality of louver plates 62 are configured such that the granular material g collides with the lower surface 62 c and falls, and the coarse floss f and the powder floss p face upward from below. Since the gap 62d having the distance D which can pass through is configured, the granular material g collides with the lower surface 62c of the plurality of louver plates 62 and vigorously descends due to inertia force, and the material at the lower end As it falls to the outlet 12, the large floss f and the powdery floss p pass upward from the lower side through the gaps 62d of the plurality of louver plates 62, and are discharged from the upper exhaust port 11, It is possible to further improve classification accuracy in which the granular material g and the coarse floss f and the powdery floss p mixed in the granular material g are separated by air flow. Furthermore, according to the present embodiment, frequent clogging does not occur when a perforated plate made of punching metal is provided, so cleaning is facilitated and the particulate material g and the particulate material g are mixed. It is possible to further improve the classification accuracy of separating the coarse floss f and the powdery floss p by the air flow.

  In the present embodiment, the inner cylinder 61 is formed so that the upper and lower ends are open, but the pressure in the central portion of the separator main body 1 is low, that is, negative pressure, according to the cyclone principle. The upper and lower ends are open because the granular material g containing coarse floss f and powdery floss p is difficult to pass upward from the lower side, so there is no problem even if the upper and lower ends are open. It is a thing. On the other hand, when the upper and lower ends of the inner cylinder 61 are closed, the coarse floss f, the powder floss p, and the granular material flowing in the lower space 31a of the upper space 31 spirally rising while circling in the counterclockwise direction R1. It is preferable that the upper and lower ends of the inner cylinder 61 be open so that the air flow containing g may not be sufficiently decelerated even by the plurality of louver plates 62.

  By the way, the content illustrated in the present embodiment is merely an example, and various modifications and changes are possible within the scope of the present invention described in the claims. For example, in the present embodiment, the air flow flowing through the first annular space 30 spirally ascends while rotating in the counterclockwise direction R1, and the air flow flowing through the second annular space 31d is counterclockwise. The air flow is rising in a spiral while rotating in a clockwise direction R2 opposite to R1. However, the air flow flowing through the first annular space 30 is rising in a spiral while rotating in a clockwise direction. The air flow flowing through the second annular space 31 d may rise in a spiral while rotating in a counterclockwise direction opposite to the clockwise direction. In this case, the plurality of louver plates 62 are arranged such that the direction of the inclination is inclined in the direction of rising in the counterclockwise direction.

  Moreover, in this embodiment, although the turning direction reversing mechanism 6 connected the flange part 63 to the flange part of the separator main body 1, it does not restrict to this, for example, the flange part 63 is not provided but a separator main body It may be integrally formed with 1.

  Furthermore, in the present embodiment, an example is shown in which the secondary air introduction pipe 4 rushing from the outside is provided in the reduced diameter lower portion 1b of the separator main body 1, but the secondary air introduction pipe 4 is not provided. The secondary air A2 may be generated by suctioning from the exhaust port 11 using a blower having a function. At this time, it is preferable to provide the turning direction reversing mechanism 6 in multiple stages. That is, although what was illustrated in this embodiment illustrates only what provides the turning direction reversing mechanism 6 only in one step, it is to provide the turning direction reversing mechanism 6 in two steps and three steps. At this time, in the first-stage turning direction reversing mechanism 6, the air flow flowing in the second annular space 31d is spirally elevated while being circulated in the clockwise direction R2 opposite to the counterclockwise direction R1. A plurality of louver plates 62 are disposed, and the second stage swirling direction reversing mechanism 6 is a spiral while the air flow flowing through the second annular space 31d circulates in a counterclockwise direction R1 in which the clockwise direction R2 is opposite to the clockwise direction R2. A plurality of louver plates 62 are arranged to rise like a circle, and in the third stage of the turning direction reversing mechanism 6, the air flow flowing in the second annular space 31d is in the clockwise direction opposite to the counterclockwise direction R1. The multiple louver plates 62 are arranged so as to rise in a spiral while revolving in the direction R2, so that the air flow is alternately changed in the clockwise direction and the counterclockwise direction, and the swirling direction in multiple stages If the reversing mechanism 6 is provided There. In this way, it is possible to reduce the situation in which the particulate material g is discharged from the exhaust port 11, and therefore, the particulate material g and the coarse floss f and the powdery floss p in the particulate material g are mixed. Classification accuracy of separation by air flow can be improved.

1 separator main body 2 baffle cylinder 4 secondary air introduction pipe (secondary air introduction means)
6 turning direction reversing mechanism 11 exhaust port 12 material outlet 13 material supply pipe (material supply means)
13a material supply port 30 first annular space 31 upper space 31a lower space 31b upper space 31c inner space 31d second annular space 32 lower space 61 inner cylinder 62 louver plate 62a upper end 62b lower end 62c lower surface 62d gap 63 flange f Coarse floss g Granular material p Powdered floss A Air A1 Primary air A2 Secondary air B1 Blower (material supply means)
B2 Blower (secondary air introduction means)
D interval M material R1 counterclockwise direction (first direction)
R2 clockwise direction (second direction)

Claims (2)

A vertical cylindrical separator body with an exhaust at the top and a material outlet at the lower end;
A longitudinal short cylindrical baffle cylinder having a closed upper and lower end disposed concentrically in the separator body;
A first annular space communicating with upper and lower spaces in the separator body formed around the baffle cylinder;
A material supply port provided in a peripheral wall portion of the separator main body facing the first annular space;
Material feeding means for tangentially feeding particulate material including foreign matter into the first annular space from the material feeding port along with the air flow of the primary air;
Secondary air introducing means for introducing secondary air into the separator body;
A pivoting direction reversing mechanism disposed at an upper portion in the separator body,
The particulate material containing foreign matter fed into the separator main body from the material supply port rises in a spiral while traveling around the first annular space in the first direction on the primary air and the secondary air. Configured to
The pivoting direction reversing mechanism is spaced apart from each other in a cylindrical inner cylinder concentrically disposed at an upper portion in the separator body and a second annular space formed around the inner cylinder. An air flow separating device including a plurality of louver plates provided so as to spirally rise while rotating in a second direction opposite to the first direction, the air flow flowing in the second annular space. The plurality of louver plates are configured such that the particulate material collides and falls, and a gap having an interval through which the contaminants can pass upward from below is configured. The air flow separation device according to claim 1.

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