JP5637538B2 - Drying equipment - Google Patents

Description

  The present invention relates to a drying apparatus.

  In order to finish vegetables, fruits, seafood, mushrooms, and other ingredients and flowers into dry products with high commercial value without losing their original fresh flavor and color, the processed materials are stored in a drying device and dried. Progress is being made.

  As such a drying device, a device that performs a drying process at a high temperature in a short time has been frequently used, but when the ingredients such as vegetables and fruits are dried at a high temperature, the original fresh flavor, taste and color of the ingredients are impaired. In addition, seafood and the like have a problem of causing corrosion.

  In order to eliminate this drawback, the present inventor has proposed to perform drying using wind at a relatively low temperature (for example, 30 to 50 ° C.) (Patent Document 1: Patent No. 4444808, patent established) ), The subsequent sales performance has been confirmed and evaluated excellent effects. According to the drying apparatus described in Patent Document 1, a random wind that becomes a random flow at predetermined time intervals is generated in the drying chamber, and the processing material disposed in the drying chamber is dried using this convection effect, thereby comparing A uniform and sufficient drying treatment effect can be provided even in a low-temperature drying chamber.

JP 2006-132855 A JP 2008-101901 A

  The drying apparatuses described in Patent Documents 1 and 2 are based on the premise that at least several stirring fans are installed on the upper and side surfaces of the apparatus, respectively, and these are operated intermittently under predetermined control. It is required to be a large-sized drying apparatus. Such a large-sized drying apparatus is extremely useful for a manufacturer such as a manufacturer who performs a drying process on dried foods.

  However, of the crops produced by farmers, for example, crops that have become poorly grown due to bad weather such as typhoons and extreme heat, and cannot be distributed to the market as they are, or exceed the required supply. In the case where a drying process is performed in order to convert the surplus, etc. that has been generated into a dried food, a smaller drying apparatus is often sufficient. In this case as well, since the drying process at a high temperature impairs the commercial value as described above, it is desirable to adopt an apparatus configuration that can randomly apply wind to the material to be processed in the drying chamber controlled at room temperature. It is.

  That is, the problem to be solved by the present invention is to achieve substantially the same drying processing efficiency by adopting a simple alternative mechanism without using a large number of stirring fans essential in the drying apparatus described in Patent Document 1. It is an object of the present invention to provide a drying apparatus having a novel configuration particularly suitable for application as a small drying apparatus.

  The present invention has been made after extensive efforts to solve the above-described problems. That is, the present invention according to claim 1 is substantially perpendicular to at least one surface facing the drying chamber in a drying apparatus for drying a material accommodated in the drying chamber by blowing air under a predetermined temperature and humidity condition. Provided with a swinging fan mechanism having a swinging plate rotatable around a rotating shaft, and a first and a second group of blower fans installed on both sides of the rotating shaft of the swinging plate, respectively, and The first drive mode for driving all the fans of the first and second blower fan groups, the first single drive mode for driving only the fans of the first blower fan group, and the second blower fan group A control means is provided for switching and controlling the second single drive mode for driving only the fan at a predetermined timing, and the swinging plate is automatically centered around the rotation axis when blowing air in the first or second single drive mode. Rotated Characterized in that so as to change the blowing direction by Rukoto.

  According to a second aspect of the present invention, in the drying apparatus according to the first aspect, the wind receiving portion is formed by bending or bending both sides of the swing plate outward.

  According to a third aspect of the present invention, in the drying apparatus according to the first or second aspect, a cross flow fan is provided above the swing fan mechanism, and air in the upper part of the drying chamber is taken in and sent to the outer region of the swing plate. It is characterized by that.

  According to a fourth aspect of the present invention, in the drying apparatus according to any one of the first to third aspects, the control means drives all the fans of the first and second blower fan groups in the full drive mode. The front fan that blows air in the substantially front direction of the swing fan mechanism installation surface and the head swing plate in one direction around the rotation axis by driving only the fans of the first blower fan group in the first single drive mode. The first oblique blower that drives all the fans of the first and second blower fan groups in the full drive mode and blows air in one oblique direction when viewed from the front of the swing fan mechanism installation surface And driving only the fans of the second blower fan group in the second single drive mode to rotate the swing plate in a direction opposite to the one direction around the rotation axis, and then in the full drive mode. First and second blower fan , And switches at a predetermined timing all the second oblique blower for blowing air in the other diagonal direction when viewed from the front of the oscillating fan mechanism installation surface by driving a fan, a.

  According to a fifth aspect of the present invention, in the drying apparatus according to the fourth aspect, when only the fans of the first blower fan group are driven in the first single drive mode, the swing plate is installed in the swing mechanism. Rotate in one direction until it abuts the surface and stop at the same position, and when only the second fan group fan is driven in the second single drive mode, the swing plate is installed in the swing mechanism It rotates in the opposite direction until it abuts against the surface and stops at the same position.

  According to the first aspect of the present invention, the direction of the air blown from the blower fan can be automatically changed by adopting the swing fan mechanism, so that the air is uniformly applied to the material to be treated in the drying chamber. There is an effect that a drying process can be performed. The head swing plate is automatically rotated by the air blown from the fan when the blower fan is driven in the first or second single drive mode, and does not require a drive mechanism such as a motor. Miniaturization can be realized. Therefore, it is suitable for adopting as a small drying apparatus having a relatively small capacity drying chamber.

  According to the second aspect of the present invention, since the wind receiving portion is formed by bending or bending both sides of the swinging plate outward, the air fed into the outer region of the swinging plate is The air can be received by the wind receiving portion without being escaped and can be blown from the blower fan into the drying chamber, so that the blowing efficiency and thus the drying efficiency can be improved.

  According to the third aspect of the present invention, the air in the upper part of the drying chamber is taken in by the cross flow fan provided above the swing fan mechanism and sent to the outer region of the swing plate. Combined with the action of the receiving part, the air blowing efficiency and thus the drying efficiency can be further improved.

  According to the fourth aspect of the present invention, the air blowing direction from the air blowing fan is switched to the front air blowing, the first oblique air blowing, and the second oblique air blowing through the air blowing fan drive mode control by the control means. Efficient and uniform drying treatment by applying dry air to the material near the back panel in the drying chamber and in front of the front panel. It can be performed.

  According to the fifth aspect of the present invention, the position when the swinging plate comes into contact with the swinging mechanism installation surface is the maximum swinging position, so that the swinging angle can be freely adjusted without using a stopper or the like. Can be set. Since a drive mechanism such as a motor is not used, there is no inconvenience that a load is generated on the motor even if air is blown from the fan in the single drive mode even after stopping at the maximum swing position.

It is a front view of the drying device by one embodiment of the present invention. It is the front view (a) and top view (b) of the swing board used for the swing fan mechanism of this drying apparatus. It is explanatory drawing which shows the effect | action by this swing fan mechanism.

  Hereinafter, a drying apparatus 10 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  The drying apparatus 10 has a main body 11 that is a substantially box body, and forms a drying chamber 20 therein. The main body 11 includes a top panel 12, a bottom panel 13, a front panel 14, a back panel 15, a left panel 16, and a removable right panel 17.

  The front panel 14 is provided with an opening 18 for accessing the inside of the drying chamber, but is normally closed by a cover (not shown) during operation of the apparatus (during the drying process). Although not shown, an opening that can be closed with a cover can be formed in another panel, for example, the left panel 16 as necessary.

  A dehumidifier 38 is externally attached to the left panel 16. Further, the detachable right panel 17 is provided with a louver-like air inlet 19 and an exhaust fan 21.

  The back panel 15 is provided with a cross flow fan 22 near the top panel 12, and a cross flow duct 23 extends downward toward the bottom panel 13 below the cross flow fan 22. The cross flow duct 23 is made of a metal plate or the like having a substantially U-shaped cross section, and is attached to the back panel 15 so that an air passage having a rectangular cross section extending downward from the bottom of the cross flow fan 22 toward the bottom surface. give. A heater 24 is provided inside the cross flow duct 23. The configurations and operations of the crossflow fan 22 and the crossflow duct 23 are described in detail in a separate application (Japanese Patent Laid-Open No. 2008-101901) by the present inventor and are not directly related to the subject matter of the present invention. The description of is omitted.

  In the drying chamber 20, a total of four vertical poles 25 are provided between the top panel 12 and the bottom panel 13 in the front, rear, left, and right, and a predetermined distance is set between the two front and rear vertical poles 25, 25. A plurality of horizontal bars 26, 26 are spanned at a height interval of. These front and rear horizontal bars 26 and 26 serve as shelves or racks on which trays and baskets (not shown) for storing processed materials such as foods are placed.

  A control box 27 is placed on the main body 11. The control box 27 contains a control circuit for controlling the operation of the drying apparatus 10 and a motor for operating a swing fan mechanism to be described later. These configurations themselves are the subject of the present invention. The details are omitted because they are not directly related. The front panel of the control box 27 includes a power breaker 28, a start switch 29, a temperature adjustment dial 30, a humidity adjustment dial 31, a hold time timer 32, a finish time timer 33, a heater switch 34, a germicidal lamp switch 35 and a cool down. Switch 36 is provided.

  In the area near the right panel 17 of the drying chamber 20 (the back part of the front panel 14), a cross flow fan 37 is provided near the top panel 12, and a swinging fan mechanism 40 is provided below the cross flow fan 37.

  The swing fan mechanism 40 will be further described with reference to FIG. FIG. 2 shows a swinging plate 41 as one component of the swinging fan mechanism 40. Both side portions 41b and 41c of a rectangular metal plate such as stainless steel are made at a predetermined angle (for example, 135 °) with respect to the main surface 41a. ) To be bent toward one side (outside in the state of being incorporated in the drying apparatus 10). A plurality of insertion holes 43 for inserting the blower fans 42 are formed in the left and right rows in the main surface 41a. For the sake of convenience, the insertion holes in the left row in FIG. 2A are indicated by reference numeral 43a, and the insertion holes in the right row are indicated by reference numeral 43b. The number of insertion holes provided above and below in each row 43a, 43b is arbitrary, and can be appropriately selected according to the volume of the drying chamber 20 and the like.

  As for the blower fan 42, in FIG. 2, the blower fans installed in the insertion holes 43a in the left row (in this embodiment, a total of five) are indicated by the reference numeral 42a, and the blower fans installed in the insertion holes 43b in the right row (this implementation In the example, a total of 5) is denoted by reference numeral 43b, and each is indicated by a virtual line.

  The blower fan 42 blows air sent from the cross flow fan 37 to the outside of the swinging plate 41 (between the right panel 17) toward the center of the drying chamber 20, and controls in the control box 27. The circuit drives the left row drive mode for driving the left row fan 42a, the right row drive mode for driving the right row fan 42b, and all the fans 42 (42a, 42b: 10 in this embodiment in total). The three drive modes of all the drive modes that can be switched can be switched at predetermined time intervals.

  A shaft 44 (shown by a dotted line in FIG. 1 and an imaginary line in FIG. 2) is fixed along the center line in the width direction on the outer surface side of the swinging plate 41. The upper and lower ends of the shaft 44 are rotatably supported by fasteners 45 and 45 on the top panel 12 and the bottom panel 13, respectively.

  An example of the operation of the drying apparatus 10 described above will be described. A tray or basket containing a material to be dried such as a food to be dried is accommodated in the drying chamber 20 so as to hang over the front and rear horizontal bars 26, 26, and the opening 18 of the front panel 14 is covered (see FIG. Then, the start switch 29 is pressed to start the drying apparatus 10. At this time, the temperature adjustment dial 30 and the humidity adjustment dial 31 are manually operated, and desired temperatures and humidity suitable for the drying process are set in advance, or set immediately after starting. In order to dry the processed material such as food in the drying chamber 20, it is preferable to set the humidity in the drying chamber 20 to about 0 to 20%. Although it depends, it is generally preferable that the temperature is about 30 to 50 ° C. Therefore, a desired temperature and humidity are set within these ranges. For example, when the outside air temperature is 25 ° C. and the humidity is 60%, the processing temperature is set to 40 ° C. and the humidity is set to 5%. A sensor for detecting the temperature / humidity of the outside air is provided together with a sensor for detecting the temperature / humidity in the drying chamber 20 (both not shown), and the temperature / humidity detected by these sensors is displayed on the front panel of the control box 27. You may make it display on a display.

  The drying process after starting the drying apparatus 10 is executed under a predetermined controlled condition by a control circuit in the control box 27 or the like. Although this control is not particularly limited, for example, it can be performed through a preheating process started by pressing the heater switch 34 after starting and a constant rate drying process automatically started after the preheating process ends. .

  In the preheating process, since the temperature of the material to be treated is generally as low as 10 to 15 ° C., the temperature in the drying chamber 20 containing a predetermined amount (for example, a maximum of 30 kg) is difficult to increase. The purpose is to reach the set temperature in a short time without exhausting. The preheating process ends when the temperature in the drying chamber 20 reaches the set temperature or when a predetermined time has elapsed. If the temperature in the drying chamber 20 is already sufficiently high, the preheating step can be omitted.

  In the constant rate drying process, the dehumidifier 38 and the exhaust fan 21 are controlled and driven while the wind from the cross duct fan 22 is heated by the heater 24 and sent into the drying chamber 20 from the lower end opening of the cross flow duct 23. The purpose is to dehumidify to the set humidity. When the inside of the drying chamber 20 is relatively low temperature (for example, 20 to 45 ° C.), dehumidification by the dehumidifier 38 is effective, and when the temperature is high (for example, 35 ° C. or more), dehumidification by the exhaust fan 21 is effective. Depending on the temperature, these may be used alone or in combination to perform dehumidification.

  Moreover, since the active evaporation is obtained up to 20% relative humidity in the drying chamber 20, normal operation is performed with the exhaust fan 21 turned off for 2 minutes / on for 15 seconds (exhaust) as one cycle, and from less than 20%. In order to promote moisture transfer (fumigation) from the center of the material to be processed (eg, vegetable core) to the surface, air blowing is stopped. That is, the exhaust fan 21 is turned off, and the blower fan 42 attached to the swinging plate 41 is also kept in the off state, thereby preventing wind directly hitting the material to be processed. Since the wind from the cross flow duct 23 does not directly hit the material to be processed, the cross flow fan 22 may be either ON / OFF. At this time, even if the temperature is relatively low (for example, 20 to 45 ° C.), the dehumidifier 38 is also stopped. Thus, when the relative humidity again exceeds 20%, the above-described normal operation is resumed. When the relative humidity falls below 20%, the ventilation is stopped and the fumigation process is performed. If this is repeated several times, the relative humidity is fixed to less than 20%. Thereafter, the normal operation for 5 minutes and the fumigation treatment for 10 minutes are repeated, and the hold time (HT) starts when the set humidity of 5% is obtained. In the above description, the control for switching between the normal operation and the fumigation process is performed using a sensor for detecting the relative humidity in the drying chamber 20 with a threshold of 20%. However, as a simpler control method, based on empirical rules. It is also possible to control the switching between the normal operation and the fumigation process by setting a predetermined time.

  HT is a time for performing a drying process at a set temperature and a set humidity, and can generally be arbitrarily set by the HT timer 32 within a range of 3 to 30 hours. When the outside air taken into the drying chamber 20 (that is, the temperature at the place where the drying apparatus 10 is installed) is excessively high, it is preferable to lower the outside air temperature by appropriately operating a cooling device such as an air conditioner. When the HT is finished, a finishing time (FT) starts, the heater 24 and the exhaust fan 21 are stopped, the outside air is shut off, and the drying chamber 20 is slowly cooled while preventing return of moisture. The FT can be arbitrarily set by the FT timer 33 and may be omitted in some cases. The cool-down switch 35 is a switch that becomes effective after the end of the HT. By depressing this switch, the dehumidifier 38 and the heater 24 are stopped, and the cross duct fans 22, 37, the blower fan 42, and the exhaust fan 21 are operated simultaneously. Then, a cool-down process is performed for the purpose of reducing the temperature of the material in the drying chamber 20 to a temperature at which the material to be treated can be collected (for example, 30 ° C. or lower).

  During the drying process in the HT, the cross flow fan 22 is controlled to repeat ON / OFF at predetermined time intervals. When the cross flow fan 22 is ON, air is taken in from the upper part of the drying chamber 20 and is sent from the upper end opening of the cross flow duct 23 directly below to the air passage inside the cross flow duct 23. The air heated to a predetermined temperature by the heater 24 while passing through this air passage is discharged from the lower end opening of the cross flow duct 23 to the drying chamber 20 to form convection of high-temperature dry air in the drying chamber 20.

  On the other hand, the cross flow fan 37 installed on the upper part of the swing fan mechanism 40 may be always ON during the drying process in the HT, and sends air taken from the surrounding area to the lower area. That is, the air from the cross flow fan 37 is sent into the space between the right panel 17 and the swinging plate 41, but as described above, both side portions 41b and 41c of the swinging plate 41 are directed outward. Therefore, the air from the cross flow fan 37 is substantially blocked from diffusing in the width direction of the swing plate 41 (the front-rear direction of the apparatus) by the both side portions 41b and 41c. . That is, both side portions 41 b and 41 c function as wind receiving portions for effectively blowing air from the fan 42 so as not to let the air from the cross flow fan 37 escape from the width region of the head swing plate 41.

  Here, the swinging plate 41 can swing (rotate) with the shaft 44 as a rotation axis, and left and right fans 42 a and 42 b are distributed symmetrically on both sides of the shaft 44. Therefore, in the full drive mode in which all the left and right rows of fans 42a and 42b are driven, the swinging plate 41 is substantially stationary while being substantially parallel to the left and right side panels 16 and 17, but the left row of fans 42a. In the left row drive mode in which only the head is driven, the swinging plate 41 rotates around the shaft 44 in the direction of arrow X by the reaction of the wind discharged from the fan 42a into the drying chamber 20, In the right row drive mode in which only the right row fan 42b is driven, the swinging plate 41 is centered on the shaft 44 by the reaction of the wind discharged from the fan 42b into the drying chamber 20, and the arrow Y in FIG. Rotate in the direction.

  The operation of the swing fan mechanism 40 will be further described with reference to FIG. 3. In the full drive mode in which all of the left and right fans 42a and 42b are driven, as shown in FIG. The plate 41 is substantially stationary in a state substantially parallel to the left and right panels 16 and 17, and winds straight from the fans 42 a and 42 b along the direction of arrow A, that is, the width direction of the drying chamber 20 (upward direction in FIG. 3). Send in. However, with this full drive mode alone, the material to be treated placed in front of the drying chamber 20 (near the front panel 14) or in the back (near the back panel 15) is hard to spread, and the drying process is sufficient. Not done.

  When the left row drive mode is switched from this state and only the left row fan 42a is driven, the swinging plate 41 rotates about the shaft 44 in the direction of arrow X in FIG. It stops at the rotational angle position that comes into contact with the inner surface of the right panel 17. Then, by switching to the full drive mode again at this stop position, an arrow having a predetermined angle (+ α) with respect to the direction perpendicular to the main surface 41a of the swinging plate 41, that is, with respect to the width direction of the drying chamber 20 Wind can be sent in the B direction (FIG. 3B).

  When the state is switched from this state to the right row drive mode and only the right row fan 42b is driven, the swing plate 41 rotates about the shaft 44 in the direction of arrow Y in FIG. It stops at the rotational angle position that comes into contact with the inner surface of the right panel 17. Then, by switching again to the full drive mode at this stop position, a predetermined angle (−α) is given to the direction perpendicular to the main surface 41a of the swinging plate 41, that is, the width direction of the drying chamber 20. Wind can be sent in the direction of arrow C (FIG. 3C).

  Therefore, for example, after all the fans 42 (42a, 42b) are operated for 10 minutes in the full drive mode, the mode is switched to the left row drive mode and only the left row of fans 42a is operated for 2 minutes, as shown in FIG. After the state is obtained, the mode is again switched to the full drive mode, and all the fans 42 are operated for 10 minutes. Then, the mode is switched to the right row drive mode, and only the right row fan 42b is operated for 2 minutes. After the state is obtained, the fan drive cycle is switched to the full drive mode again to operate all the fans 42 for 10 minutes in advance, and the wind is distributed uniformly throughout the drying chamber 20 by programming the control circuit in advance. be able to. The head swing plate 41 is rotated by the reaction of the air flow, contacts the inner surface of the right panel 17 and stops at that position, and does not use a driving mechanism such as a motor. In addition, even after reaching the stop position (FIG. 3 (b) or FIG. 3 (c)), the force to rotate in the same direction was further exerted by continuing to drive only the one-side fan. Even so, there is no disadvantage that an excessive load is applied to the motor. Therefore, it is not necessary to perform strict time control. In addition, by switching the fan drive mode in this way, a random air flow is generated in the drying chamber 20, and the high-temperature dry air discharged from the lower end of the cross flow duct 23 is sent from the fan 42 in a substantially horizontal direction. Since the function of preventing the rise and diffusing into the drying chamber 20 is achieved, the effect of making the temperature and humidity in the drying chamber 20 uniform can be obtained more significantly.

  The embodiment described above is not limited, and various modifications can be made without departing from the scope of the present invention.

  For example, the swing fan mechanism 40 in the above-described embodiment is merely an example, and other configurations may be adopted as long as the same function and effect are realized. In this embodiment, the rotatable shaft 44 is fixed along the center of the swinging plate 41 in the width direction. However, the swinging plate 41 may be configured to be rotatable with respect to the fixed shaft.

  In addition, the side portions 41b and 41c of the swinging plate 41 are functioned as a wind receiving portion by bending them at a predetermined angle toward the outside of the apparatus, but the shape is limited as long as the same function is realized. For example, the side portions 41b and 41c may be bent in an arc shape to form a wind receiving portion.

  Further, the swing fan mechanism 40 is provided on at least one surface facing the drying chamber 20, and may be provided close to either one or both of the left and right side panels 16 and 17, as in the illustrated embodiment. Alternatively, it may be provided in the back of the drying chamber 20 in the vicinity of the back panel 15. In this case, the cross flow fan 22 and the cross flow duct 23 (and the heater 24 therein) can be provided on either one or both of the left and right side panels 16 and 17.

  Further, the number of blower fans 42 a and 42 b in the left and right rows that are installed on the head swing plate 41 in the left and right direction can be arbitrarily selected according to the capacity of the drying chamber 20. Further, the left and right rows of fans 42 a and 42 b are not limited to one row each, and a plurality of rows of blower fans may be installed according to the capacity of the drying chamber 20.

  Further, in the illustrated embodiment, the left row fan 42a is controlled to be driven simultaneously in the left row drive mode, and the right row fan 42b is driven simultaneously in the right row drive mode. A plurality of fans arranged in the vertical direction in 42a and 42b can be individually driven and controlled to perform more strict temperature / humidity control.

  Although not shown, if a photocatalyst mesh is attached to the outer surface side of each fan 42 (42a, 42b) in the swing fan mechanism 40, the air that has passed through the photocatalyst mesh passes from the fan 42 to the drying chamber 20. This is effective as a measure to remove airborne bacteria.

DESCRIPTION OF SYMBOLS 10 Drying apparatus 11 Main body 12 Top panel 13 Bottom panel 14 Front panel 15 Back panel 16 Left panel 17 Right panel 18 Opening part 19 Inlet 20 Drying chamber 21 Exhaust fan 22 Crossflow fan 23 Crossflow duct 24 Heater 25 Vertical pole 26 Horizontal Bar 27 Control box (control means)
28 Power breaker 29 Start switch 30 Temperature adjustment dial 31 Humidity adjustment dial 32 Hold time timer 33 Finish time timer 34 Heater switch 35 Sterilization light switch 36 Cool down switch 37 Cross flow fan 38 Dehumidifier (air conditioner)
40 Swing fan mechanism 41 Swing plate 41a Main surface 41b, 41c Both sides (wind receiving portion)
42 Blowers 42a Left row fans (first fan group)
42b Right row fans (second fan group)
43 Insertion Hole 43a Left Row Insertion Hole 43b Right Row Insertion Hole 44 Shaft (Rotating Axis)
45 Fastener

Claims (5)

In a drying apparatus for drying a material accommodated in a drying chamber by blowing air under a predetermined temperature and humidity condition, at least one surface facing the drying chamber is swung around a substantially vertical rotation axis. A swing fan mechanism having a plate and a first and second blower fan group installed on each side of the rotary shaft of the swing board, and the first and second blower fan groups are provided. All drive modes for driving all fans, a first single drive mode for driving only the fans of the first blower fan group, and a second single drive mode for driving only the fans of the second blower fan group And a control means for switching and controlling at a predetermined timing, and changing the air blowing direction by automatically rotating the swinging plate around the rotation axis during air blowing in the first or second single drive mode. Drying apparatus characterized by the the like. The drying apparatus according to claim 1, wherein the wind receiving portion is formed by bending or bending both sides of the head swinging plate outward. The drying apparatus according to claim 1, wherein a cross flow fan is provided above the swing fan mechanism to take in air in the upper part of the drying chamber and send it to an outer region of the swing plate. The control means drives all fans in the first and second blower fan groups in the full drive mode and blows air in a substantially front direction of the swing fan mechanism installation surface, and the first single drive All the fans of the first and second blower fan groups in the full drive mode after rotating the swing plate in one direction around the rotation axis by driving only the fans of the first blower fan group in the mode And driving only the fans of the second blower fan group in the second one-side drive mode, and the first oblique blower that blows air in one oblique direction when viewed from the front of the swing fan mechanism installation surface. After the head swing plate is rotated in the direction opposite to the one direction around the rotation axis, all the fans of the first and second blower fan groups are driven in the full drive mode to The other side as seen from the front And it switches the second oblique blower for blowing air in direction, at a predetermined timing, drying apparatus according to any one of claims 1 to 3. When only the fans of the first blower fan group are driven in the first single drive mode, the swing plate rotates in the one direction until it abuts on the swing mechanism installation surface and stops at the same position, When only the fans of the second blower fan group are driven in the second single drive mode, the swing plate rotates in the opposite direction and stops at the same position until it comes into contact with the swing mechanism installation surface. The drying apparatus according to claim 4.

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