JP5829194B2 - Coating equipment - Google Patents

Description

  The present invention relates to a coating apparatus that performs coating, mixing, drying, and the like of powders of pharmaceuticals, foods, agricultural chemicals, and the like, and more particularly, to a coating apparatus that includes a ventilation-type rotating drum that is driven to rotate about an axis.

  It is equipped with a rotating drum for film coating, sugar coating, etc. on tablets such as pharmaceuticals, foods, agricultural chemicals, soft capsules, pellets, granules, etc. (hereinafter collectively referred to as powders). Coating equipment is used.

  This type of coating apparatus is disclosed in, for example, the following Patent Documents 1 to 3.

  Patent Document 1 discloses a coating apparatus including a ventilating rotary drum that is rotationally driven around a horizontal axis. The peripheral wall portion of the rotating drum has a polygonal cross-sectional shape, and each side surface of the peripheral wall portion is given air permeability by a porous portion. A jacket is attached to each outer peripheral side of each side surface of the peripheral wall portion, and a ventilation channel is formed between the jacket and each side surface of the peripheral wall portion. In addition, a ventilation mechanism for controlling the flow of processing gas such as dry air to the rotating drum is disposed on the other end side of the rotating drum, that is, the side where the rotation driving mechanism including a motor or the like is installed. This ventilation mechanism has a function of communicating the ventilation channels that have come to predetermined positions with the rotation of the rotary drum, respectively, with the air supply duct and the exhaust duct.

  Patent Documents 2 and 3 disclose a coating apparatus having a so-called jacketless structure. The rotating drum of the coating apparatus shown in FIG. 1 of Patent Document 2 includes a peripheral wall portion having a polygonal cross-sectional shape. Each side surface of the peripheral wall portion of the rotating drum is given air permeability by a porous portion. A partition plate is provided at each apex of the polygonal peripheral wall, and sliding frames are provided at both axial ends of the peripheral wall. A partitioned ventilation space is formed by each side surface of the peripheral wall portion, the partition plate, and the sliding frame. The rotating drum is accommodated in the outer casing, and air supply / exhaust portions are provided on the upper side and the lower side of the outer casing. The lower exhaust part is provided with a seal plate made of rubber, synthetic resin, etc., and with the rotation of the rotating drum, the partition plate and the sliding frame of the peripheral wall part are in sliding contact with the seal plate, Air in the internal space of the casing is prevented from being exhausted without contributing to drying of the granular material in the rotating drum. The upper part of the peripheral wall is open to the internal space of the outer casing. After the dry gas supplied to the inner space of the outer casing from the upper air supply part passes through the porous part in the upper part of the peripheral wall part and enters the rotary drum, after passing through the granular material layer in the rotary drum As the rotary drum rotates, the air is exhausted to the exhaust part through the ventilation space that has come to the position of the exhaust part on the lower side. The rotating drum of the coating apparatus shown in FIG. 2 of Patent Document 2 includes a peripheral wall portion having a circular cross section. A seal plate having an arcuate cross section is provided on each of the air supply unit and the exhaust unit. Patent Document 3 also discloses a jacketless structure coating apparatus having the same basic structure as Patent Document 2.

JP 2001-58125 A Japanese Patent Publication No. 7-63608 JP 2008-253910 A

  Since the jacketless structure coating apparatus of Patent Documents 2 and 3 is configured to seal the exhaust by sliding the sliding frame provided on the rotating drum and the partition plate on the sealing plate provided on the exhaust portion side, The plate is likely to be worn, and the exhaust of the exhaust plate and short path (a phenomenon in which the dry gas supplied into the rotating drum is exhausted without contributing to the drying of the granular material layer) are likely to occur due to the wear of the seal plate. On the other hand, in order to replace the worn seal plate, it is necessary to remove the exhaust duct and the rotary drum of the exhaust section, which is a heavy work load.

  Also, if the sliding contact force between the sliding frame and partition plate and the seal plate fluctuates due to the fluctuation of the rotation axis of the rotating drum, the distortion of the casing, etc. It is promoted to cause contamination, and if the sliding contact force fluctuates in an excessively small direction, it may cause exhaust leakage or a short path.

  Also, in order to tightly seal the exhaust by sliding the sliding frame of the rotating drum and the partition plate and the seal plate, it is necessary to manage the dimensions and shape of the slide frame, the partition plate, and the seal plate with high accuracy. There is. Therefore, this leads to an increase in manufacturing cost and complication of processing work, and it is practically difficult to manage the dimensional shape so that the outer periphery (circular shape) of the sliding frame and the inner surface (arc shape) of the seal plate are in close sliding contact. The problem is that the exhaust seal is likely to be insufficient.

  Furthermore, in the polygonal rotating drum, a partition plate is provided at each top of the peripheral wall portion, and the interval between the partition plates adjacent in the rotation direction is large. Therefore, the ventilation space defined by the partition plate has a large size in the rotational direction, and the degree of occurrence of a short exhaust path increases. That is, when a certain partition plate enters the area of the exhaust part as the rotating drum rotates, the ventilation space defined by the partition plate communicates with the exhaust part. Is large, dry gas in the rotating drum enters the ventilation space through a thin area of the granular material layer or above the granular material layer, and is exhausted from the ventilation space to the exhaust section.

  An object of the present invention is to provide a coating apparatus which does not have a jacket for a ventilation channel like the coating apparatus disclosed in Patent Document 1 and is less likely to cause exhaust leakage and short path.

  Another object of the present invention is that the coating apparatus having the jacketless structure is not easily affected by run-out of the rotating shaft of the rotating drum, distortion of the casing, and the like, and the dimensional shape is easily managed and the replacement work is also easy. It is to provide a configuration of the seal portion.

In order to solve the above-described problems, the present invention provides a coating apparatus including a ventilation-type rotating drum in which a granular material to be processed is housed and driven to rotate around an axis thereof. A peripheral wall portion having a ventilation portion for communicating the inside and the outside, and a plurality of partition portions provided at predetermined intervals in the rotation direction on the outer periphery of the peripheral wall portion, and a vent hole on the outer peripheral side of the peripheral wall portion of the rotary drum The plurality of partition portions are respectively mounted on the base portion fixed to the outer periphery of the peripheral wall portion and the base portion in a state in which movement in a direction approaching and separating from the peripheral wall portion is permitted. And a seal member that is in sliding contact with the ventilation member when the rotary drum rotates.

  In the above configuration, annular seal rings may be attached to both axial ends of the outer periphery of the peripheral wall portion, and the seal rings may be in sliding contact with the ventilation member when the rotary drum rotates.

In the above configuration, the ventilation member may be disposed on the lower outer peripheral side of the rotating drum, or may be configured to cover the peripheral wall portion of the rotating drum from the outer peripheral side.

  The said structure WHEREIN: The sealing member of a partition part can be set as the structure urged | biased by the centrifugal force at the time of rotation of a rotating drum, and press-contacted to a ventilation member.

  The said structure WHEREIN: The surrounding wall part of a rotating drum can be set as the structure which has a polygonal cross-sectional shape.

  The said structure WHEREIN: In the said structure, a some partition member can be arrange | positioned at each top part and each side surface of the surrounding wall part of a rotating drum.

  According to the present invention, it is possible to provide a coating apparatus that has a jacketless structure that does not have a jacket, such as the coating apparatus disclosed in Patent Document 1, and is less likely to cause exhaust leakage and short paths.

  In addition, in the above jacketless coating system, the seal part configuration is easy to control the dimensions and shape, and is not easily affected by runout of the rotating drum center axis or distortion of the casing. can do.

It is a longitudinal cross-sectional view of the coating apparatus which concerns on embodiment of this invention. It is the figure which looked at the front panel from the front side. FIG. 3 is a transverse sectional view {FIG. 3 (a)} and a longitudinal sectional view {FIG. 3 (b)} of the rotating drum. FIG. 4 is an enlarged cross-sectional view {FIG. 4A) showing the periphery of the peripheral wall portion of the rotating drum, and an enlarged cross-sectional view {FIG. 4B} of the partition portion. It is an expanded sectional view showing the circumference of the end of a rotating drum. It is a cross-sectional view of a coating apparatus. It is the partial sectional view which looked at the nozzle movement mechanism from the upper part. It is the schematic cross-sectional view which looked at the rotating drum from the front side. It is a figure which shows the air supply part by the side of the front-end part of a rotating drum, Fig.9 (a) is the figure which looked at the front-end part of the casing from the front side, FIG.9 (b) is a longitudinal cross-sectional view of the peripheral part of an air supply part It is. It is the schematic cross-sectional view which looked at the rotating drum from the back side. It is sectional drawing which shows schematically the modification of a partition part. It is sectional drawing which shows schematically the modification of a partition part. It is sectional drawing which shows schematically the modification of a partition part. It is sectional drawing which shows schematically the modification of a partition part. It is a figure which shows roughly the modification of a partition part, Fig.15 (a) is a side view, FIG.15 (b) is aa sectional drawing of Fig.15 (a). It is a cross-sectional view which shows the rotating drum which concerns on other embodiment.

  As shown in FIG. 1, the coating apparatus according to this embodiment includes a ventilating rotary drum 1 that is driven to rotate about an axis X that is parallel or substantially parallel to the horizontal line. The rotary drum 1 is rotatably accommodated in the casing 2 and is rotationally driven by a rotational drive mechanism 3 disposed on the rear end side. Further, the rotary drum 1 is accommodated inside the casing 2 inside the internal housing 4, and the space portion of the internal housing 4 is hermetically sealed against the outside. Furthermore, a spray nozzle unit 5 having one or a plurality of spray nozzles 5a for spraying a spray liquid such as a film material liquid toward the granular material layer is disposed inside the rotary drum 1. In this embodiment, the rotary drum 1 has a front end opening 1e at the front end and a rear end opening 1g at the rear end. In addition, air supply portions A1 and A2 are provided on the front end opening portion 1e and the rear end opening portion 1g, respectively.

  The front end of the casing 2 constitutes a chamber 2a, and the front surface of the chamber 2a is closed by a front panel 2b having an inspection window 2b1. The chamber 2a accommodates a vertical movement mechanism 8 and an airflow guide member 20 described later.

  The spray nozzle unit 5 is attached to a distal end portion of an L-shaped support pipe 6 via a connection pipe 7, and a proximal end portion of the support pipe 6 is connected to a vertical movement mechanism 8 attached to the inner surface side of the front panel 2b. Has been. The vertical movement mechanism 8 can adjust the vertical position of the spray nozzle unit 5 manually or automatically (by an actuator mechanism such as an air cylinder or a ball screw). Further, a nozzle moving mechanism 9 described later is connected to the front panel 2b, and the nozzle moving mechanism 9 can move the front panel 2b along with the spray nozzle unit 5 in the axis X direction of the rotary drum 1. In addition, it can be swung between a first position P1 indicated by a one-dot chain line and a second position P2 indicated by a solid line in FIG.

  As shown in FIG. 3, in this embodiment, the rotary drum 1 includes a peripheral wall portion 1a having a polygonal (for example, a 10-sided or 12-sided) transverse cross-sectional shape, and an end wall portion 1b continuous to the front end of the peripheral wall portion 1a. And an end wall portion 1c continuous to the rear end of the peripheral wall portion 1a. On each side surface of the peripheral wall portion 1a, a ventilation portion formed of a porous portion is provided. In this embodiment, the ventilation portion is formed by attaching a perforated plate to each side surface of the peripheral wall portion 1a. A mouth ring portion 1d is provided at the front end of the end wall portion 1b, and a front end opening portion 1e is provided in the mouth ring portion 1d. Moreover, the connection part 1f is provided in the rear end of the end wall part 1c, and the rear-end opening part 1g is provided in the connection part 1f. An extension portion 1h (see FIG. 1) used for mounting a drive system component that rotationally drives the rotary drum 1 is connected to the connection portion 1f.

  In this embodiment, annular seal rings 13 are provided at both axial ends of the peripheral wall portion 1a of the rotary drum 1, and a plurality of partition portions 14 are provided at predetermined intervals in the rotation direction on the outer periphery of the peripheral wall portion 1a. It has been. The partition part 14 has a plate-like form as a whole, has a longitudinal direction dimension substantially the same as the axial dimension of the peripheral wall part 1a, and is arranged on the outer periphery of the peripheral wall part 1a in a direction parallel to the axis of the rotary drum 1. Moreover, the partition part 14 is each arrange | positioned at each top part 1a2 and each side surface 1a1 of the polygonal surrounding wall part 1a. The seal ring 13 and the partition part 14 are in sliding contact with the sliding contact part 10a (see FIG. 6) of the ventilation member 10 having the ventilation hole 10b when the rotary drum 1 is rotated.

As shown in FIG. 4, in this embodiment, the partition part 14 is in a state in which the base part 14a fixed to the outer periphery of the peripheral wall part 1a and the base part 14a are allowed to move in the inner and outer peripheral directions of the peripheral wall part 1a. And a mounted seal member 14b. Here, the inner and outer peripheral directions (inner peripheral direction and outer peripheral direction) of the peripheral wall portion 1a mean a direction approaching and separating from the peripheral wall portion 1a. The same applies to the following description. The base portion 14a is formed in a flat plate shape with a metal material or the like, and is fixed to the outer periphery of the peripheral wall portion 1a by an appropriate means such as welding in a direction parallel to the axis of the rotary drum 1. The seal member 14b is formed in a flat plate shape using a synthetic resin material such as a fluorine-based resin (PTFE or the like) or a synthetic rubber material such as hard rubber, and is attached to one surface side or the other surface side of the base portion 14a. For example, the seal member 14b has a long hole 14b1 that is vertically long in the inner and outer peripheral directions of the peripheral wall portion 1a (see also FIG. 5), and is a bolt that is inserted into the long hole 14b1 via a resin or metal washer 14c. 14d is attached to the base portion 14a by being screwed into a bolt hole 14a1 provided in the base portion 14a. The seal member 14b is movable in the inner and outer peripheral directions of the peripheral wall portion 1a with respect to the base portion 14a within the gap between the elongated hole 14b1 and the shaft portion of the bolt 14d when mounted on the base portion 14a. . Therefore, when the seal member 14b receives a force directed in the outer circumferential direction, the seal member 14b moves in the outer circumferential direction while being in sliding contact with one surface or the other surface of the base portion 14a, and the distal end portion of the ventilation member 10 has a force commensurate with the above force. It press-contacts to the sliding contact part 10a. As a means for applying the external force to the seal member 14b, an elastic biasing means such as a spring may be used. However, in this embodiment, the sealing is performed by a centrifugal force accompanying the rotation of the rotary drum 1 from the point of simplification of the structure. A means for urging the member 14b in the outer circumferential direction is employed. Further, a pin may be used instead of the bolt 14d.

  As shown in FIG. 5, the seal ring 13 includes a base portion 13a fixed to the outer periphery of the end portion of the peripheral wall portion 1a, and a seal member 13b attached to the base portion 13a. The base portion 13a is formed in a ring plate shape with a metal material or the like, and is fixed to the outer periphery of the end portion of the rotary drum 1 by appropriate means such as welding. The seal member 13b is formed in a ring plate shape (including a ring plate shape formed by combining a plurality of partial ring plate materials) with a synthetic resin material such as a fluororesin (PTFE or the like) or a synthetic rubber material such as hard rubber. It is mounted on the outer surface side of the base portion 13a. For example, the seal member 13b has a long hole 13b1 that is vertically long in the inner and outer peripheral directions of the peripheral wall 1a, and a bolt 13d that is inserted into the long hole 13b1 through a resin or metal washer 13c is attached to the base 13a. By screwing into the provided bolt hole 13a1, it is fixedly attached to the base 13a. The seal member 13b is in a state of being fixedly attached to the base portion 13a, and a tip portion thereof is in pressure contact with the sliding contact portion 10a of the ventilation member 10. The seal member 13b is movable in the inner and outer peripheral directions of the peripheral wall portion 1a with respect to the base portion 13a within the gap between the elongated hole 13b1 and the shaft portion of the bolt 13d when mounted on the base portion 13a. It may be made to be. In this case, when the seal member 13b receives a force directed in the outer peripheral direction, the seal member 13b moves in the outer peripheral direction while being in sliding contact with one surface or the other surface of the base portion 13a. Is pressed against the sliding contact portion 10a. Moreover, it may replace with said volt | bolt 13d and may use a pin.

  As shown in FIG. 6, a duct-shaped ventilation member (exhaust member) 10 is provided on the lower outer peripheral side of the rotary drum 1. The ventilation member 10 communicates with the exhaust duct 12 via an exhaust passage 11 provided in the inner housing 4. The ventilation member 10 includes an arc-shaped sliding contact portion 10a in which the seal ring 13 of the rotary drum 1 and the partition portion 14 are in sliding contact, and a ventilation port (exhaust port) 10b provided in a part of the sliding contact portion 10a. Yes. The seal ring 13 and the partition 14 provided on the peripheral wall 1a of the rotating drum 1 are in sliding contact with the sliding contact portion 10a of the ventilation member 10 when the rotating drum 1 is rotated. A plurality of ventilation spaces C1 partitioned by the partitioning portion 14 at predetermined intervals in the rotation direction are formed. That is, one ventilation space C1 is formed by the seal rings 13 at both ends in the axial direction, the two partition portions 14 adjacent to each other in the rotation direction, and the outer periphery of the peripheral wall portion 1a, and this ventilation space C1 is an area of the ventilation hole 10b. A plurality are formed along the rotation direction. In this embodiment, the partition portions 14 are arranged on the top portions 1a2 and the side surfaces 1a1 of the polygonal peripheral wall portion 1a, respectively, so that the number of the top portions 1a2 of the peripheral wall portion 1a is larger than the number of the side surfaces 1a1. A number of ventilation spaces C1 are formed in the region of the vent 10b. The plurality of ventilation spaces C1 may partially or entirely have different rotational direction dimensions (the spacing between the partition portions 14 is unequal), but all preferably have the same rotational direction dimension. (The arrangement interval of the partition part 14 is equal intervals). Further, the partition portions 14 extend in the radial direction around the axis of the rotary drum 1 at each top portion 1a2, and extend in the direction orthogonal to the respective side surfaces 1a1 at each side surface 1a1, but all the partition portions 14 are provided. May extend in the radial direction, or at least one partition 14 may be inclined forward or backward (preferably backward) in the rotational direction.

  In this embodiment, the lower part of the inner housing 4 forms a cleaning bucket 4a (see also FIG. 1), and the ventilation member 10 is provided inside the cleaning bucket 4a. When the rotary drum 1 is cleaned, a cleaning liquid L such as cleaning water is supplied to the cleaning bucket 4a. The ventilation member 10 and the cleaning bucket 4a are provided with drainage ports 10c and 4b, respectively. The cleaning bucket 4a is provided with a bubble flow injection nozzle (a bubbling jet nozzle) (not shown) that injects a cleaning liquid in which bubbles are mixed into the cleaning liquid in the cleaning bucket 4a. Further, cleaning nozzles 10 d and 10 e for injecting the cleaning liquid are arranged inside the ventilation member 10, and a cleaning nozzle 11 a for injecting the cleaning liquid is arranged inside the exhaust passage 11, and the cleaning liquid is injected into the upper space of the internal housing 4. Cleaning nozzles 4c and 4d for spraying are arranged.

  FIG. 7 is a partial cross-sectional view of the nozzle moving mechanism 9 as viewed from above. In this embodiment, the nozzle moving mechanism 9 includes an axial direction moving mechanism 9A that moves the front panel 2b along with the spray nozzle unit 5 in the direction of the axis X of the rotary drum 1, and a first position indicated by a one-dot chain line in FIG. A nozzle position adjusting mechanism 9B that pivots between P1 and a second position P2 indicated by a solid line is provided. The axial movement mechanism 9A slide-guides the axial movement along the slide shafts 9a and 9b arranged in parallel to each other and the axes X1 and X2 (parallel to the axis X of the rotary drum 1) of the slide shafts 9a and 9b. The slide bearing portions 9c and 9d and the slide rails 9e and 9f are main components. The nozzle position adjusting mechanism 9B mainly includes rotating bearing portions 9g and 9h that support the rotation of the slide shafts 9a and 9b around the axes X1 and X2, and a rotation driving unit 9i that rotates the slide shaft 9b. This is a component.

  The front end portion of the slide shaft 9a is connected to the box 8a of the vertical movement mechanism 8 attached to the inner surface side of the front panel 2b, and the rear end portion of the slide shaft 9a is a slide provided in the housing of the rotary bearing portion 9g. It is slidably mounted on a slide rail 9e via a pin 9j. A piping pipe 9k is inserted through the slide shaft 9a. Inside the piping pipe 9k, piping tubes for supplying atomized gas (atomized air) or the like to the spray nozzles 5a of the spray nozzle unit 5 are accommodated. Connected to the spray nozzle 5a.

  The front end portion of the slide shaft 9b is connected to the turning shaft portion 9m attached to the inner surface side of the front panel 2b, and the rear end portion of the slide shaft 9b is connected to the slide pin 9n provided in the housing of the rotary bearing portion 9h. And is slidably mounted on the slide rail 9f. The turning shaft portion 9m has an eccentric member 9m1 attached to the front end portion of the slide shaft 9b, an eccentric pin 9m2 fixed to the eccentric member 9m1, and the eccentric pin 9m2 so as to be rotatable with respect to the inner wall of the front panel 2b. And an eccentric bearing portion 9m3 to be supported. The axis X3 of the eccentric pin 9m2 is eccentric by a predetermined amount from the axis X2 of the slide shaft 9b.

  The rotation drive unit 9i includes a drive motor 9i1 and a gear mechanism 9i2 that transmits the rotational force of the drive motor 9i1 to the slide shaft 9b. The drive motor 9i1 is attached to the housing of the rotation bearing portion 9h (and / or the rotation bearing portion 9g), and the rotation drive portion 9i has a shaft along with the slide shaft 9b (and / or the slide shaft 9a). The direction is movable. When the drive motor 9i1 of the rotation drive unit 9i rotates, the turning power is transmitted to the slide shaft 9b via the gear mechanism 9i2, and the slide shaft 9b rotates about the axis X2. When the slide shaft 9b rotates about the axis X2, the eccentric member 9m1 attached to the front end of the slide shaft 9b rotates, and the eccentric pin 9m3 (axis X3) fixed to the eccentric member 9m1 is an eccentric bearing. While being pivotally supported by the portion 9m3, it turns around the axis X2 of the slide shaft 9b. As a result, as shown in FIG. 2, the front panel 2b has the axis line X1 of the slide shaft 9a parallel to the axis line X of the rotary drum 1 as a turning center (in a plane orthogonal to the axis line X1). And turn between a first position P1 indicated by 2 and a second position P2 indicated by a solid line.

  The first position P1 and the second position P2 of the front panel 2b shown in FIG. 2 correspond to the first position P1 'and the second position P2' of the spray nozzle unit 5 shown in FIG. The first position P1 ′ is the position of the spray nozzle unit 5 where the spray nozzle unit 5 is located on the inner diameter side of the diameter of the front end opening 1e of the rotary drum 1, in other words, the spray nozzle unit 5 is the front end of the rotary drum 1. This is the position of the spray nozzle unit 5 that can move in the axial direction without interfering with the opening 1e. The second position P2 ′ is such that at least the spray nozzle 5a of the spray nozzle unit 5 is on the outer diameter side with respect to the diameter of the front end opening 1e of the rotary drum 1 and the vertical plane V including the axis X of the rotary drum 1 This is the position of the spray nozzle unit 5 located on the front side in the rotational direction A of the rotary drum 1. At the second position P2 ', when the spray nozzle unit 5 moves in the axial direction, it interferes with the front end opening 1e of the rotary drum 1. The second position P2 'may be an installation position of the spray nozzle unit 5 at the time of processing the granular material, or may be a position above or below this set position. In the latter case, the spray nozzle unit 5 is moved from the second position P2 'to the set position by the vertical movement mechanism 8 or from the set position to the second position P2'. In the example shown in FIG. 7, the second position P2 'is an installation position of the spray nozzle unit 5 at the time of processing the granular material. In addition, FIG. 8 shows the installation position P2 ′ (solid line) of the spray nozzle unit 5 when the surface layer portion S1 of the granular material layer S is at a relatively high position (when the processing amount of the granular material is large), The installation position P2 ′ (dotted line) of the spray nozzle unit 5 when the surface layer portion S1 of the granular material layer S is at a relatively low position (when the amount of processing of the granular material is small) is shown. Further, in this embodiment, at the second position P2 ′, the spray nozzle 5a of the spray nozzle unit 5 sprays the spray liquid vertically downward (so that the spray nozzle of the spray nozzle 5a faces vertically downward). The direction of the nozzle 5a is set. The spray position of the spray nozzle 5a can be adjusted in the vertical direction by the vertical movement mechanism 8.

  FIG. 9 shows an air supply part A1 provided on the front end opening 1e side of the rotary drum 1. In this embodiment, the air supply unit A1 is a process of hot air or cold air supplied via an air flow guide plate 20 as an air flow control unit disposed in the chamber 2a at the front end of the casing 2 and the air supply duct 21. And a passage member 24 for forming a passage portion 24a that guides the gas to the airflow guide plate 20. The airflow guide plate 20 includes a side portion 20a facing away from the front end opening 1e, and another side portion 20b bent in a direction approaching the front end opening 1e from the one side 20a, and the range of the front end opening 1e. Among these, it arrange | positions in the position corresponding to the area | region which becomes the rotation direction back side (right side in the same figure) with respect to the vertical surface V containing the axis line X of the rotating drum 1. FIG. Further, the airflow guide plate 20 is arranged in an inclined posture in a direction gradually approaching the vertical plane V from below to above. The passage member 24 is attached to the front end wall of the casing 2, and the front side is closed by the front panel 2b, thereby forming a passage portion 24a in the chamber 2a. The upper portion of the passage portion 24 a communicates with the air supply port 21 a of the air supply duct 21. The airflow guide plate 20 is fixed to the front side portion of the lower portion of the passage member 24 or is integrally formed. A cleaning nozzle 22 that ejects cleaning liquid is disposed inside the chamber 2a, and a cleaning nozzle 23 that ejects cleaning liquid is disposed inside the passage portion 24a. The processing gas supplied from the air supply port 21a of the air supply duct 21 is guided to the airflow guide plate 20 through the passage portion 24a, guided by the airflow guide plate 20 having the above-described form, and from the front end opening 1e. It flows into the inside of the rotating drum 1. Therefore, as shown in FIG. 8, the processing gas flowing into the rotary drum 1 is located above the powder layer S with respect to the installation position P2 ′ of the spray nozzle unit 5 when processing the powder, In addition, the flow is directed toward the space in the rotary drum 1 on the back side with respect to the spray nozzle unit 5.

  As shown in FIG. 1, an air supply part A2 provided on the side of the rear end opening 1g of the rotary drum 1 includes an internal space of a chamber member 30 having a connection port 30a with an air supply duct (not shown), and rotation. An airflow guide plate 32 is disposed in an air supply chamber 31 configured with an internal space of the extending portion 1f of the drum 1, and processing gas such as hot air and cold air supplied to the air supply chamber 31 through an air supply duct is supplied. The air guide plate 32 guides the air to the inside of the rotary drum 1 from the rear end opening 1g. The chamber member 30 is connected to the rear end portion of the extending portion 1f. In this embodiment, the airflow guide plate 32 is supported by one or a plurality of support members 32a, and is disposed in an inclined manner with a predetermined angle θ1 in the internal space of the extending portion 1f. Further, in this embodiment, the airflow guide plate 32 is formed of a semicircular plate member as shown in FIG. 10, and the arc portion 32a has the same diameter as the inner peripheral surface (the rear end opening portion 1g) of the extending portion 1f. (Or substantially the same diameter), the side portion 32b is disposed in a posture inclined by a predetermined angle θ2 with respect to the vertical surface V including the axis X of the rotary drum 1 so as to face the back side of the spray nozzle unit 5. Therefore, the processing gas supplied to the air supply chamber 31 through the air supply duct is guided by the airflow guide plate 32, so that the installation position P2 ′ of the spray nozzle unit 5 at the time of processing of the granular material is set. The air flows into the inside of the rotating drum 1 from the rear end opening 1g, directed above the powder layer S and toward the space in the rotating drum 1 on the back side with respect to the spray nozzle unit 5. A cleaning nozzle 33 for ejecting the cleaning liquid is provided through the airflow guide plate 32. A cleaning nozzle 34 that ejects cleaning liquid is disposed inside the chamber member 30.

  As shown in FIG. 6, when the granular material is processed, the rotary drum 1 rotates in the direction A in FIG. Slid in contact. In particular, the seal member 14b of the partition part 14 is movable in the inner and outer peripheral directions, receives the centrifugal force accompanying the rotation of the rotary drum 1, moves in the outer peripheral direction, and slides the ventilation member 10 with a force commensurate with the centrifugal force. Press contact with the contact portion 10a. The processing gas supplied into the rotary drum 1 from the air supply unit A1 on the front end side and the air supply unit A2 on the rear end side of the rotary drum 1 passes through the powder layer S, and the particle layer. After contributing to the drying of S, the air enters the ventilation space C1 through the ventilation portion (porous portion) of the peripheral wall portion 1a of the rotary drum 1, and is exhausted from the ventilation space C1 to the ventilation member 10 through the ventilation port 10b. .

  Since the sealing member 14b of the partition portion 14 is configured to seal the ventilation space C1 by being pressed against the sliding contact portion 10a of the ventilation member 10 by the centrifugal force accompanying the rotation of the rotary drum 1, the dimensions and attachment of the partition portion 14 The sealing member 14b is always subjected to a predetermined force (a force commensurate with the centrifugal force) without being affected by the error of the above, the dimensional change due to the wear of the sealing member 14b, the shaft center of the rotating drum 1 and the distortion of the casing. Is pressed against the sliding contact portion 10a. Therefore, the sealing performance with respect to the ventilation space C1 is stabilized, and the occurrence of exhaust leakage and short path is more effectively prevented. In addition, it is relatively easy to manage the dimensions and shapes of the parts constituting the partition section 14. Furthermore, there is no abnormal wear of the seal member 14b due to excessive pressure contact force, the occurrence of contamination is reduced, and the replacement frequency of the seal member 14b is also reduced. On the other hand, even when the seal member 14b is replaced, the replacement operation is relatively easy. Moreover, in this embodiment, by arranging the partition portions 14 on the respective top portions 1a2 and the respective side surfaces 1a1 of the polygonal peripheral wall portion 1a, the number of the top portions 1a2 of the peripheral wall portion 1a (the number of the side surfaces 1a1) is increased. Since a large number of ventilation spaces C1 are formed in the region of the vent 10b, the occurrence of a short exhaust path can be more effectively prevented.

  During the processing of the powder (when the rotary drum 1 is rotated), the surface layer portion S1 of the powder layer S is inclined upward toward the front side in the rotation direction A, and the spray liquid from the spray nozzle 5a While the sprayed particles of the surface layer portion S1 flow from the position (spray zone) where the spray liquid is sprayed to the lower side of the slope (direction B shown in FIG. 6), Receive moderate drying (drying zone). By installing the spray nozzle unit 5 at the second position P2 ′ which is an upper position in the tilt direction with respect to the surface layer portion S1 of the granular material layer S, the surface layer portion S1 which has received the spray of the spray liquid from the spray nozzle 5a. The flow distance when the granular particles flow to the inclined lower side B becomes relatively large, and spreading and drying of the spray liquid are effectively performed. Furthermore, in this embodiment, since the spray nozzle 5a of the spray nozzle unit 5 sprays the spray liquid vertically downward toward the granular material layer S at the second position P2 ′, the spray liquid is sprayed from the spray nozzle 5a. The received granular material particles of the surface layer portion S1 are promoted to flow downwardly by the spraying pressure of the spray liquid.

  In the air supply part A1 on the front end side of the rotary drum 1, it is guided by the airflow guide plate 20, above the powder layer S and on the back side of the spray nozzle unit 5. The processing gas supplied to the inside of the rotary drum 1 in the direction of the space is dried at a lower slope than the spray zone as indicated by the white arrow in FIG. 6 after the flow velocity is reduced in the space. It enters the granular material layer S from the zone, passes through the granular material layer S, and is exhausted from the vent 10 b of the ventilation member 10. That the processing gas is supplied to the space on the back side of the spray nozzle unit 5 and that the processing gas enters the granular material layer S from the drying zone inclined downward from the spray zone; The phenomenon that the spray pattern of the spray liquid sprayed from the spray nozzle 5a is disturbed by the air flow of the processing gas is more effectively prevented in combination with the effect of reducing the flow velocity of the processing gas in the space. The Further, since the flow of the processing gas does not rebound in the surface layer portion S1 of the granular material layer S due to the decrease in the flow velocity of the processing gas, the generation and scattering of dust due to the rebound of the air flow hardly occur. Furthermore, the granular particles in the surface layer portion S1 sprayed with the spray liquid from the spray nozzle 5a at the upper position (spray zone) in the inclination direction of the granular layer S flow to the drying zone on the lower side of the inclination, Since the spray liquid spreads on the surface to some extent and then comes into contact with the airflow of the processing gas, dust generation and scattering are less likely to occur.

  Further, in the air supply portion A2 on the rear end side of the rotary drum 1, guided by the air flow guide plate 32, from the rear end opening portion 1g, above the granular layer S and to the spray nozzle unit 5. The processing gas supplied to the inside of the rotary drum 1 so as to be directed to the space portion in the rotary drum 1 on the rear side is reduced in the flow rate in the space portion, and then the drying zone inclined downward from the spray zone. Enters the granular material layer S, passes through the granular material layer S and is exhausted. That the processing gas is supplied to the space on the back side of the spray nozzle unit 5 and that the processing gas enters the granular material layer S from the drying zone inclined downward from the spray zone; The phenomenon that the spray pattern of the spray liquid sprayed from the spray nozzle 5a is disturbed by the air flow of the processing gas is more effectively prevented in combination with the effect of reducing the flow velocity of the processing gas in the space. The Further, since the flow of the processing gas does not rebound in the surface layer portion S1 of the granular material layer S due to the decrease in the flow velocity of the processing gas, the generation and scattering of dust due to the rebound of the air flow hardly occur. Furthermore, the granular particles in the surface layer portion S1 sprayed with the spray liquid from the spray nozzle 5a at the upper position (spray zone) in the inclination direction of the granular layer S flow to the drying zone on the lower side of the inclination, Since the spray liquid spreads on the surface to some extent and then comes into contact with the airflow of the processing gas, dust generation and scattering are less likely to occur.

  As described above, the spray liquid such as the film material liquid sprayed from the spray nozzle 5 a of the spray nozzle unit 5 to the granular material layer S is mixed with each of the granular particles by the stirring and mixing action accompanying the rotation of the rotary drum 1. It is spread on the surface and dried by the process gas passing through the granular material layer S. Thereby, a coating film is formed on the surface of each granular material particle.

  When the processing of the powder particles is completed and the spray nozzle unit 5 is pulled out from the inside of the rotary drum 1, first, the drive motor 9i1 of the rotation drive unit 9i of the nozzle position adjusting mechanism 9B in the nozzle moving mechanism 9 ( 7), the slide shaft 9b is rotated about the axis X2, and the eccentric pin 9m3 (axis X3) is pivoted about the axis X2, so that the front panel 2b is moved to the axis X1 of the slide shaft 9a. Is turned from the second position P2 indicated by the solid line in FIG. 2 to the first position P1 indicated by the alternate long and short dash line. Thereby, the spray nozzle unit 5 attached to the front panel 2b pivots from the second position P2 ′ shown in FIG. 8 to the first position P1 ′ without interfering with the front end opening 1e of the rotary drum 1. The rotary drum 1 can move in the direction of the axis X. When the spray nozzle unit 5 is set at the second position P2 ′ indicated by the solid line in FIG. 8, the spray nozzle unit 5 is moved to the second position P2 ′ indicated by the dotted line by the vertical movement mechanism 8. , Swivel. Thereafter, the axial movement mechanism 9A in the nozzle movement mechanism 9 is manually operated, or is operated by an appropriate axial driving means such as an air cylinder, so that the spray nozzle unit 5 is moved along with the front panel 2b. By moving in the direction of the axis X, the spray nozzle unit 5 can be pulled out of the rotary drum 1 from the front end opening 1e (see FIG. 1). At that time, the slide shafts 9a and 9b of the axial movement mechanism 9A are slid and guided by the slide bearing portions 9c and 9d and the slide rails 9e and 9f, so that the front panel 2b and the spray nozzle unit 5 are connected to the axis of the rotary drum 1. It can move smoothly in the X direction.

  On the other hand, when the spray nozzle unit 5 is inserted from the outside to the inside of the rotating drum 1, the front panel 2b is first positioned at the first position P1 indicated by the alternate long and short dash line in FIG. Then, the spray nozzle unit 5 is moved in the direction of the axis X of the rotary drum 1 together with the front panel 2b, and the spray nozzle unit 5 is inserted into the rotary drum 1 from the front end opening 1e. Thereafter, the drive motor 9i1 of the rotation drive unit 9i of the nozzle position adjusting mechanism 9B of the nozzle moving mechanism 9 is operated, and the front panel 2b is shown in a solid line in FIG. 2 with the axis X1 of the slide shaft 9a as the turning center. Turn to 2 position P2. As a result, the spray nozzle unit 5 attached to the front panel 2b pivots from the first position P1 'shown in FIG. 8 to the second position P2', and is set to the position at the time of processing the granular material. When the spray nozzle unit 5 is set to the second position P2 ′ indicated by the solid line in FIG. 8, the vertical position is set by the vertical movement mechanism 8 from the second position P2 ′ indicated by the dotted line to the second position indicated by the solid line. Move to P2 ′.

  When cleaning the rotary drum 1, as shown in FIG. 6, first, a cleaning liquid L such as cleaning water is supplied to the cleaning bucket 4a. The cleaning liquid L supplied to the cleaning bucket 4 a enters the inside of the rotating drum 1 from the ventilation portion (porous portion) of the peripheral wall portion 1 a of the rotating drum 1 and also enters the inside of the exhaust member from the vent 10 b of the ventilation member 10. . In this way, after the cleaning liquid is stored in the cleaning bucket 4a, the rotating drum 1 is rotated, and cleaning is performed while a bubble flow of the cleaning liquid is ejected into the cleaning liquid from a bubble flow injection nozzle (not shown). Due to the synergistic effect of the rotation of the rotating drum 1 in the cleaning liquid of the cleaning bucket 4a, the jet of cleaning liquid ejected into the cleaning liquid from the bubble flow injection nozzle, and the bubbles, the inner wall of the rotating drum 1 and the ventilation section and the inside of the rotating drum 1 And the inside of the ventilation member 10 can be effectively cleaned.

  Furthermore, in this embodiment, since the partition part 14 is provided in the surrounding wall part 1a of the rotating drum 1, when the rotating drum 1 rotates, the cleaning liquid in the cleaning bucket 4a is caused to flow forward in the rotation direction by the partition part 14, Air bubbles in the cleaning liquid are held on the front side in the rotational direction of the partition portion 14, and are circulated inside the rotary drum 1 through the ventilation portion (porous portion) of the peripheral wall portion 1a. That is, the flow rate of the cleaning liquid that passes through the ventilation portion of the peripheral wall portion 1a tends to be slow, and bubbles in the cleaning solution are trapped on the hole wall surface of the ventilation portion (venting hole), so that sufficient cleaning power cannot be obtained. However, since the partition portion 14 increases the flow rate of the cleaning liquid that passes through the ventilation portion, the trapping of the bubbles hardly occurs and the flowability of the bubbles is improved. Therefore, the ventilation part of the peripheral wall part 1a which is particularly difficult to clean can be effectively cleaned. In addition, the effect of splash cleaning can be expected by cleaning the cleaning liquid in the cleaning bucket 4a from the liquid level L forward by the partitioning portion 14 and splashing it on the peripheral wall portion 1a. Due to the effect of such splash cleaning, not only the peripheral wall portion 1a of the rotating drum 1 but also the cleaning of the spray nozzle unit 5 and the baffle inside the rotating drum 1 can be expected. Further, since the partition part 14 moves in the rotational direction, a positive pressure is generated in the cleaning liquid on the front side in the rotational direction of the partition part 14 and a negative pressure is generated in the cleaning liquid on the rear side in the rotational direction. The cleaning liquid flows into the inside of the rotary drum 1 from the ventilation portion (ventilation hole), and flows out of the rotation drum 1 from the ventilation portion (ventilation hole) on the back side in the rotation direction. The cleaning power is improved by the circulation / vortex of the cleaning liquid. In addition, although the top part of the peripheral wall part 1a is not provided with the partition part 14, the circulation / vortex of the cleaning liquid is generated to some extent in the peripheral part, but each side surface of the peripheral wall part 1a is provided with the partition part 14 Without providing, the circulation of the cleaning liquid becomes slow especially in the peripheral part at the center in the rotation direction. Therefore, it is effective to provide the partition portion 14 on each side surface of the peripheral wall portion 1a from the viewpoint of detergency, and preferably promotes circulation of the cleaning liquid in the peripheral portion in the center of each side surface in the rotation direction. As described above, it is preferable to install one or a plurality of partition portions 14 on each side surface. Moreover, it is preferable that the space | interval between the partition parts 14 adjacent to a rotation direction is made larger than the height of the partition part 14 which has the largest height.

  After cleaning the rotary drum 1 as described above, the cleaning liquid is discharged from the drain ports 10c and 4b through the drain pipe 4c shown in FIG.

  11 to 13 schematically show modified examples of the partition portion 14. In the modification shown in FIG. 11, a flat plate-like seal member 14b is mounted on a base portion 14a having a U-shaped cross section. In the modification shown in FIG. 12, a flat plate-like sealing member 14b having a wide section 14b1 having a rectangular cross section is attached to a rectangular tubular base 14a having an opening in the longitudinal direction. In the modification shown in FIG. A flat plate-shaped sealing member 14b having a wide portion 14b1 having a trapezoidal cross section is attached to a triangular cylindrical base portion 14a having an opening in a direction. In these modifications, when the sealing member 14b receives a centrifugal force accompanying the rotation of the rotary drum 1, the sealing member 14b moves in the outer peripheral direction while slidingly contacting the base portion 14a (in FIGS. 11 to 13, the base portion 14a and the sealing member 14b The front end of the gap is pressed against the sliding contact portion 10a of the ventilation member 10 with a force commensurate with the centrifugal force. In the modification shown in FIGS. 12 and 13, when the wide portion 14b1 of the seal member 14b is engaged with the opening of the base portion 14a during assembly, disassembly, etc., the seal member 14b is detached from the base portion 14a. It is to be prevented.

  FIG. 14 schematically shows a further modification of the partition 14. In this modification, a flat plate-like seal member 14b is rotatably mounted on a base 14a having a circular cross section. When the sealing member 14b receives a centrifugal force accompanying the rotation of the rotary drum 1, the sealing member 14b rotates in a direction to stand up with respect to the base portion 14a, and the tip portion thereof is a sliding contact portion of the ventilation member 10 with a force corresponding to the centrifugal force. Press contact with 10a.

  FIG. 15 schematically shows a further modification of the partition section 14. In this modification, a plurality of grooves 14a2 and a plurality of grooves 14b2 are formed on the sliding contact surfaces of the base portion 14a and the seal member 14b that face each other. The groove 14a2 and the groove 14b2 each extend in the outer peripheral direction. When the rotary drum 1 is cleaned, the cleaning liquid enters the sliding contact portion between the base portion 14a and the seal member 14b via the grooves 14a2 and 14b2, thereby improving the cleaning performance of the sliding contact portion. Such a groove may be formed on at least one of the sliding contact surfaces of the base portion 14a and the seal member 14b facing each other. Moreover, you may form such a groove | channel in the direction which inclines or orthogonally crosses with respect to the outer peripheral direction.

  FIG. 16 shows a rotating drum 1 according to another embodiment. In this embodiment, the peripheral wall portion 1a of the rotary drum 1 is covered from the outer peripheral side by a cylindrical ventilation member 40 at a predetermined interval, and the inner periphery 40a of the ventilation member 40 and the outer periphery of the peripheral wall portion 1a. A space C is formed between the entire circumference. Sealing rings 13 for closing the space C from the end side are provided at both axial ends of the peripheral wall 1a, and a plurality of partitions that divide the space S at predetermined intervals in the rotation direction are provided on the outer periphery of the peripheral wall 1a. A partition 14 is provided. The seal ring 13 and the partition portion 14 are the same as those in the above-described embodiment, and are in sliding contact with the inner peripheral surface 40 a of the ventilation member 40 when the rotary drum 1 rotates. By partitioning the space portion C with a plurality of partition portions 14 at predetermined intervals in the rotation direction, a plurality of ventilation spaces C1 partitioned into a predetermined rotation direction dimension are formed on the outer peripheral side of the peripheral wall portion 1a. That is, one ventilation space C1 is formed by the inner periphery 40a of the ventilation member 40, the seal rings 13 at both ends in the axial direction, the two partition portions 14 adjacent in the rotation direction, and the outer periphery of the peripheral wall portion 1a. A plurality of ventilation spaces C1 are formed along the rotation direction on the outer peripheral side of the peripheral wall portion 1a.

  The ventilation member 40 has a ventilation port (exhaust port) 40b in a part thereof. In this embodiment, the vent 40 is formed in the lower part of the vent member 40 with a predetermined rotational dimension and axial dimension. A ventilation chamber 41 is connected to the ventilation port 40 b of the ventilation member 40, and a ventilation duct 42 is connected to the ventilation chamber 41. A sealing member 43 for preventing dry gas from leaking is provided at a connection portion between the vent 40 b and the vent chamber 41 of the vent member 40.

  The processing gas supplied into the rotary drum 1 from the air supply unit A1 on the front end side and the air supply unit A2 on the rear end side of the rotary drum 1 passes through the powder layer S, and the particle layer. After contributing to the drying of S, the air enters the ventilation space C1 through the ventilation portion (porous portion) of the peripheral wall portion 1a of the rotating drum 1, and is exhausted from the ventilation space C1 to the ventilation chamber 41 through the ventilation port 40b. . Note that an air supply port may be provided at a predetermined position of the ventilation member 40 and air may be supplied from the air supply port to the inside of the rotary drum 1. Since other matters are the same as those in the above-described embodiment, a duplicate description is omitted.

  In the above embodiment, the air supply unit A1 is provided on the front end side of the rotary drum 1 and the air supply unit A2 is provided on the rear end side. However, only the air supply unit A1 on the front end side or the rear end side It is good also as a structure which provides only this air supply part A2. The air supply unit A1 may have the same configuration as the air supply unit A2, and conversely, the air supply unit A2 may have the same configuration as the air supply unit A1.

  In the above embodiment, the nozzle moving mechanism 9 has a biaxial structure including two slide shafts 9a and 9b, but includes only one slide shaft corresponding to the slide shaft 9a. A uniaxial structure may be adopted. In this case, a slide bearing portion that slides and guides the single slide shaft, a rotation bearing portion that supports rotation around the axis of the slide shaft, and a rotation drive portion that rotates the slide shaft are provided. By rotating the slide shaft by the rotation drive unit, the front panel 2b is pivoted about the axis of the slide shaft as a pivot center.

  The present invention is not limited to a coating apparatus provided with a rotating drum having a polygonal cross-sectional shape of the peripheral wall portion, but also applied to a coating apparatus provided with a rotating drum having a circular, conical or polygonal conical cross-sectional shape of the peripheral wall portion. The same applies. Further, the present invention is not limited to a coating apparatus having a so-called jacketless structure, and is similarly applicable to a coating apparatus having a structure in which a jacket is mounted on the peripheral wall portion of the rotating drum. Further, the present invention is not limited to a coating apparatus in which the rotating drum is driven to rotate about an axis parallel or substantially parallel to the horizontal line, but can be similarly applied to a coating apparatus in which the rotating drum is driven to rotate about an axis inclined with respect to the horizontal line. is there.

DESCRIPTION OF SYMBOLS 1 Rotating drum 1a Peripheral wall part 1a1 Side surface 1a2 Top part 10 Ventilation member 10a Sliding contact part 10b Ventilation hole 13 Seal ring 14 Partition part 14a Base part 14b Seal member 40 Ventilation member 40a Inner circumference 40b Ventilation hole

Claims (7)

In a coating apparatus provided with a ventilation-type rotating drum in which powder particles to be processed are housed and rotated around an axis thereof,
The rotating drum includes a peripheral wall portion having a ventilation portion that allows the inside and the outside of the rotating drum to communicate with each other, and a plurality of partition portions provided at predetermined intervals in the rotation direction on the outer periphery of the peripheral wall portion,
A ventilation member having a vent is disposed on the outer peripheral side of the peripheral wall portion of the rotating drum,
Each of the plurality of partition portions is attached to the base portion fixed to the outer periphery of the peripheral wall portion , and attached to the base portion in a state in which movement in a direction approaching and moving away from the peripheral wall portion is allowed, and the rotation A coating apparatus comprising: a sealing member that is in sliding contact with the ventilation member when the drum rotates.   2. The coating according to claim 1, wherein annular seal rings are respectively attached to both axial ends of the outer periphery of the peripheral wall portion, and the seal rings are in sliding contact with the ventilation member when the rotary drum rotates. apparatus. The coating apparatus according to claim 1, wherein the ventilation member is disposed on a lower outer peripheral side of the rotating drum.   The coating apparatus according to claim 1, wherein the ventilation member is disposed so as to cover a peripheral wall portion of the rotating drum from an outer peripheral side.   The coating apparatus according to any one of claims 1 to 4, wherein the seal member of the partition portion is urged by a centrifugal force at the time of rotation of the rotary drum and is pressed against the ventilation member.   6. The coating apparatus according to claim 1, wherein the peripheral wall portion of the rotating drum has a polygonal cross-sectional shape.   The coating apparatus according to claim 6, wherein the plurality of partition portions are disposed on each top portion and each side surface of the peripheral wall portion of the rotating drum.

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