JP2529815B2 - Hot air drying method and apparatus thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot air drying method and apparatus for drying an object to be dried, which is agitated and transferred by rotation, with hot air.

[0002]

2. Description of the Related Art Conventionally, as a device for drying processed food products such as hail and snacks or inorganic materials such as chamotte with hot air, for example, hot air drying devices shown in FIGS. 3 and 4 are known. .

The hot air dryer 41 shown in FIGS. 3 and 4 is used.
Defines a drying chamber 44 forming the bottom surface by a flat plate-shaped transfer plate 43 having a large number of ventilation holes 42 formed therein, and hot air from a hot air blower (not shown) is blown below the transfer plate 43 to dry the drying chamber 44. A duct 45 that blows air through the ventilation hole 42 is provided inside. Further, above the drying chamber 44, an exhaust port 46 for exhausting the hot air blown into the drying chamber 44 is provided.

On the upstream side of the drying chamber 44, there is a material 47 to be dried.
An input port 48 for inputting is introduced, and below the input port 48, a stirrer 49 for stirring the material to be dried 47 input into the drying chamber 44 is provided. Further, on the downstream side of the drying chamber 44,
A discharge port 50 for discharging the dried material 47 to be dried is opened, and the discharge port 50 is provided with a lid 51 which is vertically movable.

In drying the material 47 to be dried, first, the hot air blower is driven to drive the drying chamber 44 through the duct 45.
Blow hot air inside. Next, the stirrer 49 is driven and the material to be dried 47 is charged through the charging port 48. And the dried object 47
Are scattered by being blown up by hot air and moving up and down on the transfer plate 43. Furthermore, it is dried by hot air and the outlet 50
The to-be-dried material 47 transferred to is discharged to the outside of the hot air drying device 41 from the discharge port 50 whose opening degree is appropriately adjusted by the lid body 51.

The drying time and the amount of drying per hour are
This is done by adjusting the opening of the discharge port 50 with the lid 51.

However, in the conventional hot air drying apparatus 41 shown in FIGS. 3 and 4, because then transferred while vertically moving the upper feed plate 43 are blown up by hot air drying target 47, particle size 0.3 There is a problem that it is not possible to dry uniformly unless the material to be dried 47 is about 4 mm and has a uniform grain shape.

Therefore, as a hot air drying device capable of uniformly drying even if the particle size is not uniform, one having a structure shown in FIGS. 5 and 6 is known.

The hot-air drying device 61 having the structure shown in FIGS. 5 and 6 has a cylindrical rotary drum 63, which is open at both ends and has a large number of circular vent holes 62 formed in the circumferential surface, slightly from the horizontal direction. It is tilted and rotatably supported by drive means such as a motor. Further, inside the rotary drum 63, a mesh-shaped tubular stirring drum 64 is provided along the axial direction so that both ends are open and can ventilate.

The hot air drying device 61 includes a rotary drum 63.
And a prismatic heating chamber portion 65 is provided. Also,
The heating chamber portion 65 has a first heating chamber on one upstream side of the rotary drum 63.
65a, the second heating chamber 65b is formed on the downstream side of the other end, and each heating chamber 65a, 65b has an exhaust port 66, 66 opened on the upper surface and a ventilation port 67, 67 formed on the lower surface. There is. An air blower is attached to each of the air outlets 67, 67 via an air heater (not shown).

On the upstream side of the rotary drum 63, a chute 70 is opened at the upper end so as to close the opening of the rotary drum 63 and has a charging port 69 for charging the material 68 to be dried. Is provided with an inlet feed. Further, on the downstream side of the other end of the rotary drum 63, an outlet feed 72 that opens a discharge port 71 for discharging the dried material 68 to be dried is provided at the lower end so as to close the opening of the rotary drum 63.

[0012] Then, in the drying of the material to be dried 68, firstly, to rotate the rotary drum 63, and blown into the heating chamber 65 of hot air at error Ahi over motor drives the blower from the air outlet 67, The inside of the heating chamber 65 is heated. Next, the material to be dried 68 is charged into the rotating drum 63 that rotates from the charging port 69 of the chute 70. Then, the material to be dried 68 is dried by the hot air flowing through the ventilation hole 62 into the rotary drum 63 while being stirred and transferred by the stirring drum 64, and discharged from the outlet 71 of the outlet feed 72.

[0013]

However, in the conventional hot air drying apparatus 61 shown in FIGS. 5 and 6, when the material 68 to be dried is dried, the material 68 to be dried is rotated in the rotating drum 63. As shown in FIG. 5, since the upper surface is inclined and is agitated and transferred in a semicircular rotation, when the ratio of the material to be dried 68 to the cross-sectional area of the rotary drum 63 is increased, the thickness of the material to be dried 68 is reduced. Since the thickness becomes thick and the dried state becomes non-uniform, the drying amount of the material to be dried 68 is limited.

On the other hand, in order to maintain a good dry state and increase the dry amount, the diametrical dimension and the axial length dimension of the rotary drum 63 must be lengthened, and the hot air drying device 61 is There is a problem of upsizing.

In view of the above problems, it is an object of the present invention to provide a hot-air drying method and an apparatus thereof which can efficiently and satisfactorily dry a small apparatus regardless of the state of the material to be dried.

[0016]

According to a first aspect of the present invention, there is provided a hot air drying method in which a cylindrical rotary drum having a plurality of ventilation holes on an outer peripheral surface and containing an object to be dried is rotated about a central axis. in hot air drying method of blowing hot air through the vent upward from below the rotating drum, the hot air is above
The air is blown from the lower side to the upper side substantially in parallel with the downward direction, the strongest air is blown substantially immediately below the rotary drum in the axial direction, and the air is blown weakly toward the lateral side in the axial direction.

According to a second aspect of the present invention, there is provided a hot-air drying device, in which a plurality of ventilation holes are formed on the outer peripheral surface of the rotary drum and the rotary drum is rotated about a central axis. And a hot-air drying device that is provided below the rotary drum and that supplies hot air to the rotary drum from below, wherein the hot-air blower has a hot-air blower and the hot-air blower is provided at one end. are, substantially parallel multi-compartment formed in the vertical direction at the other end said rotary drum downwards axially along provided the wall of the rotating drum
A duct in which each opening of the blower path is opened, and the amount of air from the hot air blower, which is provided corresponding to each of the openings, is maximized substantially immediately below the axial direction of the rotary drum.
It is provided with a variable air volume adjusting means that weakens toward the lateral direction .

[0018]

According to the hot air drying method of claim 1, hot air is blown up and down.
Most strongly blown almost directly below the axial direction of the rotary drum is rotated from the lower side to the upper side substantially parallel to the direction, and blown weakly toward both sides in the axial direction, from below the material to be dried in the rotary drum to aeolian via a plurality bored with ventilation holes on the outer peripheral surface upward, many air volume just below the thickest axial material to be dried, since the air volume is small with a thin peripheral portion of the material to be dried, wide Since the material to be dried moves up and down uniformly and is agitated by rotation, the ventilation holes of the rotating drum are not blocked and hot air is dried.
Any dried substance can be well dried in a short time without passing through the granules of the dried substance and kneaded, and the drying amount is increased, so that the drying efficiency is improved.

In the hot-air drying device according to the second aspect of the present invention, the wall body provided along the axial direction of the rotary drum of the duct vertically moves the device.
From the opening of the air passage which is multi-compartment formed substantially in parallel, duct
Similar air volume adjusting means provided on preparative so the air volume of each of the openings as appropriate variable is, hot air from a hot air blower, the ventilation holes of the rotating drum that is rotated by the drive means, from below through the openings of the duct Axial direction is the strongest just below the axial direction of the rotating drum.
For blowing weakly toward a direction laterally of the material to be dried is agitated transfer of the rotating drum, since rotating stirred with uniformly vertically moved Ri throughout, the vent holes of the rotating drum is closed
It is not blocked and hot air passes between the grains of the material to be dried and is rubbed.
Nonetheless, all of the materials to be dried are satisfactorily dried in a short time, the amount of drying is increased, and the drying efficiency is improved.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of one embodiment of the hot air drying apparatus of the present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, reference numeral 1 denotes a hot-air drying device. This hot-air drying device 1 has a cylindrical rotary drum 3 which is open at both ends and has a large number of circular vent holes 2 formed on its peripheral surface.
Is rotatably supported by four receiving wheels 4 provided in the vicinity of both ends of the rotary drum 3, and is slightly inclined from the horizontal direction so that the upstream side in the longitudinal direction into which the material to be dried 5 is placed is located above. are doing.

Further, inside the rotary drum 3, a mesh-like cylindrical agitating drum 6 which is open at both ends and which can be ventilated is provided so as to be fitted to the inner peripheral surface of the rotary drum 3.
A plurality of stirrers 7 are provided on the inner peripheral surface of the rotating drum 3 so as to project in a cylindrical shape toward the center.

At the downstream end of the rotary drum 3,
A discharge adjusting plate 9 for discharging the dried product is provided so as to close the opening. A circular inspection hole 10 is formed at the approximate center of the discharge adjusting plate 9 so that the inside of the rotary drum 3 can be observed. Further, the discharge adjusting plate 9
Extraction holes 11 are formed at the peripheral edges of the extraction holes 11 in the respective orthogonal directions, and an extraction adjustment plate 12 is slidably attached to the extraction holes 11 by a driving means such as a motor (not shown). The opening degree of can be adjusted.

A rotary receiving gear 13 is formed on the outer peripheral surface of the rotary drum 3 near both ends thereof. Further, a power gear 14 as a driving means that is rotated by the drive of a motor or the like (not shown) is meshed with the rotation receiving gear 13, and the rotating drum 3 is rotated by the power gear 14.
It is designed to rotate through 13.

The hot air drying device 1 has a prismatic heating chamber portion so as to enclose the rotary drum 3 while being supported by the receiving wheels 4 and 4 on the upstream side and the downstream side of the rotating drum 3. 16 are provided. In addition, in the heating chamber section 16,
A substantially cylindrical cover 17 that encloses the rotating drum 3 is provided so as not to hinder the rotation of the rotating drum 3.

Further, the cover 17 has an exhaust port 18 on its upper surface.
Is formed, and an intake port 19 is formed on the lower surface facing the exhaust port 18 via the rotary drum 3.

The exhaust port 18 of the cover 17 has a heating chamber section.
An exhaust duct 21 that penetrates the upper surface of 16 and projects upward is provided. An exhaust fan (not shown) is attached to the upper end side of the exhaust duct 21 and communicates with an exhaust tower that processes and discharges the exhaust air from the exhaust fan.

Further, the intake port 19 is provided with an intake duct 22 which penetrates the lower surface of the heating chamber portion 16 and projects downward. The flat surface of the intake duct 22 is the rotary drum 3.
A plurality of wall bodies 23 are provided along the axial direction of
By 23, the upper air passage 24 along the axial direction of the rotary drum 3
Substantially parallel downward are multi-compartment form, the openings 24a in correspondence with the compartment are respectively opened and formed at the tip. Further, in the vicinity of the lower ends of the air ducts 24, 24, the air volume adjusting means 2
5 and 25 are provided respectively.

The air volume adjusting means 25 is provided in the air passage 24
A cylindrical shaft portion 28 that is rotated by a motor or the like (not shown) is integrally provided at the end portion of the flat plate-shaped closing plate 27 in the longitudinal direction. Both ends of the shaft portion 28 are pivotally supported in the air passage 24 so that the opening degrees of the shaft portions can be varied.

In addition, at the lower end of each intake duct 22, 22,
A hot air blower 29 is attached to each. The hot air blower 29 is composed of blowers 31 and 31 provided with an air filter (not shown) via air heaters 30 and 30. Furthermore, between the air heater 30, 30 and the air volume adjusting means 25 and 25, so as to close the lower end portion of the intake duct 22, punched plate 32 is provided round holes are more bored, the intake duct 22
The amount of hot air from the blower 31 through the air heater 30 is substantially uniform with respect to the cross section.

[0031] Then, the hot air from the blower 31 through the air heater 30, a weak Kunar so in accordance with the opening 24a in the axial direction on both sides from the directly below the axial direction of the rotary drum 3 through an intake duct 22, i.e., rotation The opening degree of the air flow rate adjusting means 25 is set so that the hot air flow rate decreases along the air flow path 24 located outside from the air flow path 24 opening facing the lower end of the drum 3.

Further, an inlet feed (not shown) is provided upstream of one end of the heating chamber 16 so as to close the upstream opening of the rotary drum 3. In addition, the inlet feed is formed with an input port 34 that opens upward at the upper end and into which the material to be dried 5 is input, and a cylindrical shape that projects into the stirring drum 6 in the rotary drum 3 at the lower end. The shoot 35 is provided.

Further, on the downstream side of the other end of the heating chamber section 16, a discharge port 36 for discharging the dried material 5 to be dried is formed at the lower end so as to close the downstream side opening of the rotary drum 3. An exit feed 37 is provided. Further, the outlet feed 37 is provided with a viewing window (not shown) facing the viewing hole 10 of the discharge adjusting plate 9 of the rotating drum 3, and the inside of the rotating drum 3 can be observed from this viewing window through the viewing hole 10. ing.

The inlet feed and the outlet feed 37
Are arranged so as not to hinder the rotation of the rotary drum 3.

Next, the operation of the above embodiment will be described.

First, the air exhausters and the air blowers 31, 31 are driven, the air sucked through an air filter (not shown) is heated by the air heaters 30, 30, and the hot air is sucked through the punching plate 32. Blow to 22. On the other hand, the air flow rate adjusting means 25, 25 are adjusted so that the opening degree of each of the air ducts 24, 24 of the intake duct 22 becomes a predetermined opening degree.

Further, the hot air blown to the intake duct 22 is
The air is blown to the heating chamber section 16 of the hot air drying device 1 through the intake duct 22.

[0038] Then, the outlet Fi over de 37 a hot air drying apparatus 1
From the input port 34 of the
Power receiving gear 14 rotated by a motor, etc.
It is charged into the stirring drum 6 of the rotating drum 3 which rotates via 13.

[0039] The drying conditions, the conditions such as the composition and shape of the material to be dried 5, hot air temperature, hot air amount due to opening of the air amount adjusting means 25 and 25, the opening degree of the removal hole 11 of the discharge adjustment plate 9 The discharge amount of the material to be dried 5 and the like are appropriately changed and set.

Further, the hot air is blown from each of the air ducts 24, 24 of the intake duct 22 by the air volume adjusting means 25, 25 so that the air volume of the hot air decreases from immediately below the axial direction of the rotary drum 3 to both sides in the axial direction. The air is blown from the intake port 19 to the rotating drum 3 in the cover 17 through the portions 24a, 24a substantially in parallel . The hot air is blown so that the material to be dried 5 is not rapidly dried from the surface, for example, the temperature of the upstream side of the stirring drum 6 of the rotary drum 3 is slightly lower than that of the downstream side.

Further, the hot air is blown into the rotary drum 3 through the ventilation holes 2 and 2 from below in the diametrical direction of the rotary drum 3 to the upper side, and is again exhausted from the exhaust port 18 through the ventilation holes 2 and 2. Exhausted through duct 21.

Then, the material to be dried 5 is blown up in the rotary drum 3 by the blowing of hot air and floats in the vertical direction, and at the same time as the rotary drum 3 rotates, it stirs while being stirred by the stirrer 7. Further, the openings of the air flow rate adjusting means 25, 25 are adjusted so that the amount of hot air is reduced in accordance with the opening 24a of the air passage 24 located outside from the opening 24a of the air passage 24 opening facing the lower end of the rotary drum 3. Because it is set, hot air
Axial direction of the rotating drum 3 with less material to dry 5
The dried material 5 is blown up only in the vicinity of both sides, and hot air flows.
And the upper surface of the material to be dried 5 in the rotating drum 3
As shown in FIG. 1, it is dried and transferred so as to be substantially horizontal.

Therefore, hot air passes between the particles of the material to be dried 5, and the material to be dried 5 can be dried efficiently in a short time.
Further, even the material to be dried 5 having a different particle size or shape can be blown up almost uniformly over the whole by hot air and can be surely dried without causing unevenness in drying, and can be widely used regardless of the state of the material to be dried 5. it can.

The material to be dried 5 that has been dried and transferred to the downstream side of the rotary drum 3 is discharged as a dried material from the extraction hole 11 whose opening is appropriately adjusted through the discharge port 36 of the outlet feed 37.

Therefore, according to the above-described embodiment, the amount of hot air blown by the blower through the air heaters 30, 30 is increased in the axial direction from the opening 24a immediately below the axial direction of the rotary drum 3 rotated by the power gear 14. Since the hot air is blown through the plurality of ventilation holes 2 formed in the outer peripheral surface from the lower side to the upper side in the rotary drum 3 so as to decrease in accordance with the openings 24a on both sides of the rotary drum 3, the article to be dried 5 moves up and down. Since it is rotatively stirred, it is possible to satisfactorily and efficiently dry, and it is possible to increase the amount of drying, so that the hot air drying device 1 can be downsized.

Further, since the material to be dried 5 is allowed to move up and down, it is possible to prevent the material to be dried 5 from being rubbed by rotary transfer as in the conventional case, and the yield due to damage to the material to be dried 5 can be reduced.

Further, since hot air is blown upward from above and is allowed to move up and down, it is possible to prevent the material to be dried 5 from blocking the ventilation hole 2 during rotary stirring, and improve the drying efficiency. Further, since the rotating drum 3 is covered with the cover 17, all the hot air can pass through the inside of the rotating drum 3, drying efficiency can be improved, and good drying can be performed in a short time.
Can be reduced in size.

Further, only by adjusting the opening degree of the air volume adjusting means 25, 25, any of the objects to be dried 5 can be moved up and down, and the utilization can be improved.

In the above embodiment, the stirrer 7 is not limited to the rod shape, but may be a wall-shaped stirrer, a stirrer 6 having a corrugated shape, or the like. Alternatively, the discharge adjusting plate 9 may not be provided, and the discharge amount of the dried product may be set based on the inclination and the rotation speed of the rotary drum 3.

[0050]

Hot-air drying method according to claim 1, wherein according to the present invention, the hot air
The strongest air is blown just below the axial direction of the rotating drum that is rotated from the lower side to the upper side substantially parallel to the vertical direction, and the air is blown weakly toward both sides in the axial direction. many air volume immediately below, the air flow is small at the thin peripheral portion of the material to be dried, lower the material to be dried uniformly Ri throughout
Can Yu dynamic direction Rutotomoni rotatable stirring, the rotary drum
The ventilation holes are not blocked and hot air can pass between the particles of the material to be dried,
All the materials to be dried can be dried in a short time without being rubbed, and the amount of drying can be increased.

In the hot-air drying device according to the second aspect of the present invention , a plurality of compartments are formed along the axial direction of the rotary drum substantially in parallel with the vertical direction.
The air volume of each opening is appropriately varied by the air volume adjusting means through the opening of the blower path, and the hot air from the hot air blower is introduced into the ventilation hole of the rotary drum from below in the axial direction of the rotary drum.
Since the air is blown most strongly immediately below and weakly toward the lateral side in the axial direction , the air volume is large just below the axial direction where the material to be dried is the thickest and
Since the air volume is small with a thin peripheral portion of dried product, the material to be dried is agitated transfer of the rotating drum, uniformly vertical direction Ri throughout
Can Rutotomoni rotation stirring can Yu moving in direction, through the rotating drum
The pores are not blocked and hot air can pass between the particles of the material to be dried, and any material to be dried can be satisfactorily dried in a short time and the amount of drying can be increased.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing an embodiment of a hot air drying device of the present invention.

FIG. 2 is a perspective view with a part thereof cut away.

FIG. 3 is a partially cutaway sectional view showing an embodiment of a conventional hot air drying device.

FIG. 4 is a perspective view with a part thereof cut away.

FIG. 5 is a partially cutaway sectional view showing another embodiment of the conventional hot air drying device.

FIG. 6 is a perspective view in which a part of the above is cut away.

[Explanation of symbols]

1 Hot Air Drying Device 2 Vent Hole 3 Rotating Drum 5 Dried Material 14 Power Gear as Driving Means 22 Intake Duct 23 Wall 24 Blower 24a Opening 25 Air Volume Control 29 Hot Air Blower

Claims (2)

(57) [Claims] 1. A cylindrical rotary drum having a plurality of vent holes on an outer peripheral surface thereof and in which an object to be dried is accommodated is rotated about a central axis, and the vent holes are formed from a lower side of the rotary drum toward an upper side thereof. in the hot air drying method for blowing hot air through the heat air is from below approximately parallel to the vertical direction upwards
The hot air drying method is characterized in that the air is blown , the air is blown most strongly almost immediately below the rotary drum in the axial direction, and is blown weakly toward the lateral side in the axial direction. 2. A cylindrical rotary drum having a plurality of vent holes formed on an outer peripheral surface thereof for accommodating an object to be dried, drive means for rotating the rotary drum about a central axis, and a drive unit provided below the rotary drum. A hot-air drying device provided with hot-air blower means for blowing hot air from below to the rotary drum, wherein the hot-air blower means is provided with a hot-air blower and the hot-air blower is provided at one end and the rotary drum is provided at the other end. It was installed under the axial direction of this rotary drum .
An air passage formed by a plurality of partitions formed in the wall in a direction substantially parallel to the vertical direction
A duct opening are opened respectively, the most strongly at approximately right below the axial air volume the rotary drum from the openings provided corresponding the hot air blower
A hot air drying device, comprising: a variable air flow rate adjusting means that weakens toward the lateral side in the axial direction .