JP6215498B1 - Heating device - Google Patents

Abstract

There is provided a heating apparatus using a microwave capable of heating an object to be processed evenly by a method other than providing a rotating stirring blade in a heating chamber. A heating apparatus according to the present invention is arranged such that a rotating shaft is inclined obliquely upward so that an opening 32 of a bottomed cylindrical inner space for accommodating a workpiece is located obliquely upward. The rotary drum 30 and the lid 20 that includes the microwave irradiation unit 22 that irradiates the microwave from the opening 32 toward the internal space and covers the opening 32 during the microwave irradiation. The inner peripheral surface 33 that defines the internal space, the bottom surface 34 that closes the end of the inner peripheral surface 33 located on the opposite side of the opening 32, the center of the bottom surface 34, and the opening 32 side from the bottom 34 side And a plurality of protrusions 36 provided in the circumferential direction of the inner peripheral surface 33, and blades extending from the inner peripheral surface 33 toward the protrusion 36 and guiding the workpiece to the protrusion 36. Yes. [Selection] Figure 3

Description

  The present invention relates to a heating device.

  Patent Document 1 discloses a roasting apparatus that has a rotating drum and performs roasting by heating with a heater.

  On the other hand, Patent Document 2 includes a direct fire type, a hot air type, a semi-hot air type, a far infrared type, an infrared type, a microwave type, a superheated steam type and the like as heating methods used for roasting coffee beans. Yes.

JP 2007-104925 A Japanese Unexamined Patent Publication No. 2016-32467

By the way, when performing roasting or the like, it is important that the object to be processed can be heated evenly. However, when using microwaves, a stirring blade is provided in a heating chamber for performing roasting and the stirring blade is rotated. Thus, if the object to be treated is uniformly mixed, there is a possibility that sparks are generated between the stirring blade and the heating chamber, and it is difficult to employ a method of stirring the object to be processed using the stirring blade.
Therefore, it is necessary to be able to heat the object to be processed without any unevenness by a method other than providing a rotating stirring blade in the heating chamber.

  This invention is made in view of such a situation, and provides the heating apparatus using the microwave which can heat a to-be-processed object uniformly by methods other than providing the stirring blade which rotates in a heating chamber. With the goal.

The present invention is grasped by the following composition in order to achieve the above-mentioned object.
(1) A heating device according to the present invention includes a rotating drum arranged so that a rotation shaft is inclined obliquely upward so that an opening of a bottomed cylindrical internal space for accommodating a workpiece is positioned obliquely upward A microwave irradiation unit that irradiates microwaves from the opening toward the internal space, and a lid that covers the opening during microwave irradiation, and the rotating drum defines the internal space An inner peripheral surface, a bottom surface closing the end of the inner peripheral surface located on the opposite side of the opening, a protrusion located at the center of the bottom surface and projecting from the bottom surface toward the opening, A plurality of blades provided in the circumferential direction of the inner circumferential surface, and extending from the inner circumferential surface to the protruding portion side to guide the workpiece to the protruding portion.

(2) In the configuration of (1), when the protrusion is viewed in a cross section along the rotation axis, a distance between two line segments corresponding to the side surface of the protrusion is from the bottom surface side. It has a shape that becomes shorter toward the opening.

(3) In the configuration of (2), each of the two line segments is part of the fastest descending curve.

(4) In the configuration of (3), a part of the fastest descending curve is an angle θ1 on the side of the protrusion formed with the bottom surface when an inclination angle of the bottom surface with respect to a horizontal line intersecting the bottom surface is an angle θ2. Is based on a part of a cycloid curve drawn as a straight line through which the center of rotation of a circle passes through a straight line within an angle θ2 ± 5 degrees.

(5) In any one configuration of the above (1) to (4), the blade has a flat plate shape, and the tip of the blade on the protruding portion side is separated from the protruding portion.

(6) In the configuration of (5), a separation distance between the tip portions of the adjacent blades is at least longer than a wavelength of the microwave.

  ADVANTAGE OF THE INVENTION According to this invention, the heating apparatus using the microwave which can heat a to-be-processed object uniformly by methods other than providing the stirring blade which rotates in a heating chamber can be provided.

It is a perspective view of the heating device of the embodiment concerning the present invention. It is the perspective view of the rotating drum which looked at the opening part side of the rotating drum of embodiment which concerns on this invention. It is sectional drawing of the perpendicular direction which mainly illustrated the rotating drum and rotation drive means of embodiment which concern on this invention. In order to explain that the two line segments corresponding to the side surfaces of the projecting portion are configured by a part of the fastest descending curve when the projecting portion of the embodiment according to the present invention is viewed in a cross section along the rotation axis. FIG. It is a photograph when a to-be-processed object is put in the rotating drum of embodiment which concerns on this invention, and the rotating drum is rotated.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter, embodiments) will be described in detail with reference to the accompanying drawings.
Note that the same number is assigned to the same element throughout the description of the embodiment.

1 is a perspective view of a heating device 10 according to an embodiment of the present invention, FIG. 2 is a perspective view of the rotating drum 30 as viewed from the opening 32 side of the rotating drum 30, and FIG. 2 is a vertical sectional view mainly showing a drive means 31. FIG.
In FIG. 3, only the portion located in the cross section is shown, the illustration of the portion visible on the back side is omitted, and the internal structure of the rotation driving means 31 is not shown.

The heating device 10 is a device that can suitably heat and roast a particulate object to be processed such as coffee beans or sesame, for example.
As shown in FIG. 1, the heating apparatus 10 includes a lid 20, a microwave generation means (not shown) for supplying microwaves to the microwave irradiation unit 22 of the lid 20 through the microwave waveguide 21, and rotation. A drum 30 and a rotation driving means 31 for rotating the rotary drum 30 are provided.
In addition, although illustration is abbreviate | omitted, the rotating drum 30 and the rotational movement means 31 are supported by the moving mechanism which moves to a horizontal direction (refer double-headed arrow X) integrally.

  For example, the microwave generating means is not particularly limited as long as it can generate microwaves generally used for heating, but in this embodiment, the wavelength is about 12.2 cm and the oscillation frequency is about A 2.45 GHz magnetron is used.

The lid 20 is fixed to the installation beam 23 via the support 24, and covers the opening 32 (see FIGS. 2 and 3) of the rotating drum 30 when the microwave is irradiated. Prevent leakage.
The lid 20 is slightly separated from the rotary drum 30 and is arranged so as not to prevent the rotation of the rotary drum 30.

  Further, as described above, the heating device 10 has a moving mechanism (not shown) that moves the rotary drum 30 and the rotation driving means 31 (see FIG. 3) together in the horizontal direction (see the double arrow X in FIG. 1). The rotating drum 30 can be moved from a position where the opening 32 (see FIGS. 2 and 3) of the rotating drum 30 shown in FIG. .

  Accordingly, by positioning the rotary drum 30 at a position where the opening 32 (see FIGS. 2 and 3) of the rotary drum 30 is not covered with the lid portion 20, the workpiece is introduced into the rotary drum 30 and the rotary drum is placed. The object to be processed can be taken out from the inside 30.

  As shown in FIGS. 2 and 3, the rotary drum 30 includes a peripheral wall portion 33 a that forms a cylindrical inner peripheral surface 33 that defines a bottomed cylindrical internal space that accommodates an object to be processed, and an opening 32. And a bottom wall portion 34a that forms a bottom surface 34 that closes an end portion of the inner peripheral surface 33 located on the opposite side.

  The depth Dp of the inner space of the bottomed cylindrical shape is about 400 mm in the present embodiment, but the depth Dp is set to an appropriate amount of the object to be processed into the rotating drum 30, while the rotating drum 30 is rotating. The depth may be determined so that the processed material does not spill out from the opening 32 at the top of the rotating drum 30. In consideration of providing blades 37 and the like in the rotating drum 30 as described later, The depth Dp of the cylindrical internal space is preferably set to 200 mm or more.

Further, as shown in FIG. 3, the rotating drum 30 has a flange portion 32 a that is provided on the outer periphery of the opening portion 32 and extends to the outside, and microwaves are difficult to leak from the gap with the lid portion 20. It has become.
In addition, the heat insulating material 35 which has the thickness which cannot make a level | step difference between the flange parts 32a is wound by the outer peripheral surface of the surrounding wall part 33a.

  Further, the rotary drum 30 includes a rotary shaft 34b extending outward from the position of the outer surface of the bottom wall portion 34a corresponding to the center of the bottom surface 34, and the rotary drive means 31 includes a drive motor and a speed reducer on the rotary shaft 34b. Are connected, and the rotating drum 30 rotates around the rotating shaft 34b.

  The rotating drum 30 is positioned at the center of the bottom surface 34, provided on the bottom surface 34 side with a protrusion 36 that protrudes from the bottom surface 34 toward the opening 32, and is provided in a plurality in the circumferential direction of the inner peripheral surface 33. And a blade 37 (see FIG. 2) extending from the inner peripheral surface 33 to the protruding portion 36 side.

In the present embodiment, the projecting portion 36 is made of a separate member and screwed to the bottom surface 34, but may be integrally formed with the bottom wall portion 34a that forms the bottom surface 34. .
In the present embodiment, the blade 37 uses a plate-like plate material having a substantially square outer shape, and the plate material is welded to both the peripheral wall portion 33 a that forms the inner peripheral surface 33 and the bottom wall portion 34 a that forms the bottom surface 34. However, for example, it may be welded to either the peripheral wall portion 33a or the bottom wall portion 34a, and the outer shape of the plate material to be used is not limited to a square, and is rectangular. Also good.
However, it is preferable to form the blades 37 by welding plate members to both the peripheral wall portion 33a and the bottom wall portion 34a because the blades 37 can be stably fixed.

Next, the rotary drum 30 will be described in more detail while explaining the relationship with the heat treatment of the workpiece.
For example, when the rotating drum 30 is inclined horizontally or downward, the object to be processed flows out from the opening 32 of the rotating drum 30, and thus a bottomed cylindrical internal space for storing the object to be processed It is necessary to install the rotating drum 30 so that the opening portion 32 of the first and second openings 32 is located above.

  On the other hand, the object to be processed is stirred so that uniform heating is promoted by the blades 37. The specific state is that when the blades 37 are located below the rotary drum 30, the object to be processed is As the rotating drum 30 rotates, the object to be processed is scooped up by the blade 37 and the blade 37 is inclined downward. It is stirred by falling along the slope.

Here, when the rotary drum 30 is installed vertically, the opening 32 is positioned above, and there is no problem that the object to be processed flows out of the opening 32 as described above, but there is no object to be collected at the blade 37. As a result, the object to be processed by the blades 37 cannot be picked up satisfactorily.
Therefore, in order to prevent the workpiece from flowing out of the rotating drum 30 and to capture the workpiece satisfactorily by the blades 37, the rotating drum 30 has a bottomed structure that accommodates the workpiece. Install so that the opening 32 of the cylindrical internal space is located obliquely above, so that the objects to be collected gather at the blades 37 located on the lower side, and the objects to be processed are well captured by the blades 37. It is preferable to do.

For this reason, as shown in FIG. 3, the rotating drum 30 has a rotating shaft 34b with respect to the horizontal plane HO so that the opening 32 of the bottomed cylindrical inner space for accommodating the object to be processed is positioned obliquely upward. It is preferable that they are arranged so as to be inclined obliquely upward by an angle θ.
In the present embodiment, the angle θ is about 40 degrees, but the angle θ is preferably, for example, 20 degrees or more and 60 degrees or less, and more preferably 30 degrees or more and 50 degrees or less.

  Further, as will be described in detail later, since the object to be processed appropriately flows on the protrusion 36, uniform heating is further promoted, so that the object to be processed falling from the blade 37 is directed to the protrusion 36. It is preferable to do so.

  Here, if the length L1 along the inner peripheral surface 33 of the blade 37 shown in FIG. 3 is long, the workpiece can be scooped up even at a position away from the bottom surface 34, and at such a remote position. When the workpiece to be scooped up falls from the blade 37, it is difficult to go to the protrusion 36.

  For this reason, the length L1 from the bottom surface 34 along the inner peripheral surface 33 of the blade 37 is such a length that the workpiece is suitably poured onto the protruding portion 36 when the workpiece is dropped from the blade 37. It is preferable that it is set.

For example, since the rotating drum 30 is installed obliquely, considering that the object to be processed falling from the blade 37 falls while flowing so as to gather on the bottom surface 34 side, the protrusion 36 protrudes from the bottom surface 34. The length L1 is preferably about 6 times or less with respect to the height h, and more preferably about 5 times.
In the present embodiment, since the protrusion height h of the protrusion 36 is about 26.7 mm, the length L1 is set to about 100 mm and is set to a length within 5 times the protrusion height h.

  Further, when the length L2 along the bottom surface 34 of the blade 37 is short, the amount of the object that can be scooped up by the blade 37 is reduced, and the object to be processed falls from a position away from the protrusion 36. This makes it difficult for the object to be processed to be guided to the protrusion 36.

  On the other hand, when the length L <b> 2 of the blade 37 is long and extends to a position where the blade 37 overlaps the protruding portion 36, an object to be processed that flows on the blade 37 from the blade 37 toward the protruding portion 36 is transferred to the blade 37. Therefore, the fluidity of the object to be processed is lowered and the stirring efficiency may be lowered.

For this reason, the length L2 along the bottom surface 34 of the blade 37 has a length that extends to a position on the protruding portion 36 side that can guide the workpiece to flow toward the protruding portion 36 satisfactorily, In addition, it is preferable to limit the length of the blade 37 so that the tip end portion 37 a on the protruding portion 36 side is separated from the protruding portion 36.
Note that if the tip 37a of the blade 37 on the protruding portion 36 side is separated from the protruding portion 36, the object to be treated falls somewhat randomly onto the protruding portion 36, so that the stirring efficiency is further improved. The temperature can be increased and uniform heat treatment can be performed.

For example, as shown in FIG. 3, the distance L3 from the inner peripheral surface 33 to the contact with the protruding portion 36 is obtained by using the inner diameter D1 of the inner peripheral surface 33 and the diameter W1 on the bottom surface 34 side of the protruding portion 36. It is calculated as L3 = (D1-W1) / 2.
As described above, in order to prevent the length L2 along the bottom surface 34 of the blade 37 from being too long and not too short, the length L2 is 0.8 times to 0 with respect to the distance L3. It is preferable that the length is about 6 times.

In this embodiment, the inner diameter D1 is about 500 mm and the diameter W1 is about 206 mm, while the length L2 is about 100 mm, and the length is about 0.68 times the distance L3 of about 147 mm. .
In addition, since the spark by a microwave may generate | occur | produce when the corner | angular part of the blade | wing 37 is an acute angle, it is preferable that the corner | angular part of the blade | wing 37 is chamfered, as shown in FIG. The corners of the blades 37 are chamfered with R10 mm.

  On the other hand, if the rotation speed of the rotating drum 30 is too slow, most of the objects to be processed fall before the object is scooped up to the height at which the rotating drum 30 falls toward the protruding portion 36, and conversely if the rotation speed is too high. Then, the amount of the processing object that falls after passing through the position where it suitably falls toward the protruding portion 36 increases.

Therefore, for example, when the object to be processed is approximately the size of coffee beans, it is preferable to set the rotation speed of the rotary drum 30 to a range of 20 rpm or more and 40 rpm or less.
However, since the appropriate rotation speed of the rotating drum 30 depends on the mass, shape, input amount, etc. of the object to be processed, the heating device 10 is adjusted so that the rotation speed can be adjusted according to the difference. As such, it is preferable that the rotational speed of the rotating drum 30 can be adjusted in the range of about 5 to 60 rpm.

  By the way, the rotary drum 30 is preferably formed of a material that can withstand the temperature during the heat treatment and is less likely to generate rust, for example, a metal such as stainless steel (SUS). It is preferable.

On the other hand, a metal such as stainless steel shields microwaves, so that if the distance between adjacent blades 37 is short, the object is not easily irradiated with microwaves.
Here, as shown in FIG. 2, the distance between adjacent blades 37 is the shortest at the tip portion 37 a of the blade 37 on the protruding portion 36 side.

  Therefore, in order to prevent the microwave from being easily irradiated to the object to be processed by the blade 37, the separation distance D2 between the tip portions 37a of the adjacent blades 37 is at least longer than the wavelength of the microwave. Is preferred.

  For example, in this embodiment, since the wavelength of the microwave is about 12.2 cm, the separation distance D2 between the tip portions 37a of the adjacent blades 37 is set to about 13 cm, and the separation distance D2 is larger than the wavelength of the microwave. Try to be a long distance.

On the other hand, in the present embodiment, as described above, the inner diameter D1 of the inner peripheral surface 33 is about 500 mm, but the inner diameter D1 is too small, that is, the space volume in the rotary drum 30 serving as a heating chamber becomes too small. Then, the microwave cannot be efficiently put into the rotating drum 30 serving as a heating chamber.
For this reason, for example, when the oscillation frequency of the present embodiment is about 2.45 GHz (the wavelength of the microwave is about 12.2 cm), the inner diameter D1 is preferably 200 mm or more.

  In the present embodiment, as shown in FIG. 2, seven blades 37 are provided at equal intervals in the circumferential direction of the inner peripheral surface 33, but the number of the provided blades 37 is the inner diameter of the inner peripheral surface 33. You may increase / decrease according to D1.

  However, the number of blades 37 is such that when the blades 37 are arranged at equal intervals in the circumferential direction, the distance D2 between the tip portions 37a of the adjacent blades 37 can be longer than the microwave wavelength. It is preferable to do.

By the way, when the microwave is irradiated, the electromagnetic field intensity is more distant from the wall surface of a metal such as stainless steel, for example, near the inner peripheral surface 33, the bottom surface 34, the blade 37, and the protruding portion 36. And the object to be processed can be efficiently heated.
Considering this difference in electromagnetic field strength, it is also conceivable that there is a difference in the heating efficiency between the part of the workpiece that is in contact with the wall surface and the part that is not in contact with the wall surface.

Therefore, ideally, when the object to be processed is irradiated with microwaves, it is preferable that the object to be processed floats in the air.
Therefore, in the present embodiment, such a state is created by providing the protruding portion 36, which will be described in detail below.

As shown in FIG. 1, the microwave waveguide 21 is connected to the center of the lid 20, and the center of the lid 20 is a microwave irradiator 22.
For this reason, the microwave is strongly radiated toward the center of the rotating drum 30, and the protruding portion 36 is provided at that position.

As shown in FIG. 3, the object to be processed that has fallen from the blade 37 flows so as to slide on the protrusion 36 as indicated by the arrow Y, and opens from the tip end side of the opening 32 of the protrusion 36. It is released into the air in a direction approaching the portion 32.
For this reason, it is possible to efficiently irradiate the object to be processed with the microwave when the object to be processed floats in the air, and at the same time, the object to be processed diffuses so that the heat treatment can be performed uniformly.

Here, in order to discharge the object to be processed from the protrusion 36 so that the distance from the wall surface can be taken, it is preferable that the speed of the object to be processed when sliding on the protrusion 36 is high.
For this purpose, the protrusion 36 has a distance between two line segments 36a corresponding to the side surface of the protrusion 36 when viewed from a cross section along the rotation axis 34b shown in FIG. It is preferable that the inclined surface is formed as having a shape that becomes shorter toward the side.
In the present embodiment, the diameter W1 on the bottom surface 34 side of the protruding portion 36 is about 206 mm, while the diameter W2 of the end surface on the opening 32 side is about 100 mm to form an inclined surface.

  Furthermore, in this embodiment, in order to maximize the speed when the workpiece slides on the protrusion 36, the two line segments 36a are each configured as a part of the fastest descending curve. This will be described in detail below.

  The curve drawn by the locus of the fixed point on the circumference when the circle rotates without slipping along the fixed line is called the cycloid curve, and the curve that turns the cycloid curve upside down is the fastest descent curve Among many straight lines and curves connecting two points, the object is the curve that travels the fastest between the two points.

FIG. 4 is a diagram for explaining that the two line segments 36a corresponding to the side surfaces of the protruding portion 36 are configured by a part of the fastest descending curve when viewed in a cross section along the rotation axis 34b. is there.
FIG. 4 shows a diagram in which a part of the cycloid curve is drawn on the upper side, and a fastest descent curve in which a part of the cycloid curve is inverted upside down is drawn on the lower side, and a part of the protrusion 36 (hatching part) Reference) is also shown.
4 is a portion located above the central axis of the rotating shaft 34b in FIG. 3, and the central axis of the rotating shaft 34b is shown as the F axis. ing.

  As shown in FIG. 4, a curve drawn with a fixed point P (cycloid curve) when the X axis is a constant straight line and the circle having a radius r = 20 mm does not slide on the X axis without half-spinning (rotating 180 degrees). And the position of the fastest descent curve at the position where it has been rotated halfway (180 degrees) is positioned at the position of the end P1 on the side of the opening 32 on the side surface of the protrusion 36. The portion of the fastest descending curve between the projecting portion 36 where the fastest descending curve intersects the bottom surface 34 (see FIG. 3) to the end portion P2 on the bottom surface 34 side corresponds to the line segment 36a.

  In FIG. 4, since it is a line segment 36a corresponding to the side surface of the protrusion 36 corresponding to the upper portion when viewed in a cross section (vertical cross section) along the rotation axis 34b, the lower diagram in FIG. As shown, the line segment 36a is part of the fastest descent curve that is upside down based on part of the cycloid curve drawn as a horizontal line that intersects the bottom surface 34 with the straight line S passing through the center of rotation of the circle. It has become.

  However, for example, the line segment 36a corresponding to the side surface of the lower protrusion 36 in FIG. 3 is based on a part of a cycloid curve drawn as a horizontal line intersecting the bottom surface 34 with the straight line S through which the center of rotation of the circle passes. It is not part of the fastest descent curve upside down.

  Naturally, the line segment 36a in the cross section along the rotation axis 34b other than the vertical cross section is also turned upside down based on a part of the cycloid curve drawn as a horizontal line intersecting the bottom surface 34 with the straight line S passing through the center of rotation of the circle. An expression representing the line segment 36a in the cross section taken at an arbitrary angular position along the rotation axis 34b will be described below because it is not part of the fastest descent curve.

As shown in FIG. 3, since the bottom surface 34 is inclined with respect to the horizontal plane HO at an angle θ2, when considering a horizontal line intersecting the bottom surface 34, the inclination angle of the bottom surface 34 with respect to the horizontal line is an angle θ2. .
As described above, since the angle θ is about 40 degrees in the present embodiment, the angle θ2 is about 50 degrees.

  4 shows a straight line LN corresponding to the angle θ2 (a straight line corresponding to the horizontal line intersecting the bottom surface 34). Since the straight line LN and the straight line S are in a parallel relationship, Assuming that the angle θ1 is the angle between the straight line S passing through the center of rotation of the circle that draws the cycloid curve that is the basis of the fastest descent curve and the bottom surface 34, the angle θ1 and the angle θ2 are equal.

This angle θ1 does not change even if the straight line S and the cross section of the protrusion 36 (see the hatched portion) are rotated about the F axis shown in the lower diagram of FIG.
That is, for example, the straight line S through which the rotation center of the circle that draws the cycloid curve that is the basis of the fastest descent curve corresponding to the portion of the line segment 36a corresponding to the side surface of the lower protrusion 36 of FIG. The angle between the projecting portions 36 formed therebetween is an angle θ1.

  Therefore, in the cross section taken at an arbitrary angular position in the circumferential direction along the rotation axis 34b, the line segment 36a corresponding to the side surface of the protruding portion 36 has an angle θ1 on the protruding portion 36 side with respect to the bottom surface 34. Is a part of the fastest descent curve based on a part of the cycloid curve drawn so that the center of rotation of the circle passes on the straight line S.

  However, the angle θ1 and the angle θ2 cannot be said to be completely coincident in manufacturing. For example, if the angle θ1 is in the range of about the angle θ2 ± 5 degrees, any circumferential direction along the rotation shaft 34b is assumed. When viewed in a cross section taken at an angular position, the two line segments 36a corresponding to the side surfaces of the projecting portion 36 have a bottom surface 34 and an inclination angle of the bottom surface 34 with respect to a horizontal line intersecting the bottom surface 34, respectively. The angle θ1 on the projecting portion 36 side is a part of the fastest descent curve based on a part of the cycloid curve drawn as a straight line S through which the center of rotation of the circle passes a straight line in the range of the angle θ2 ± 5 degrees. I can say that.

  FIG. 4 shows the case where the radius r of the circle that draws the cycloid curve is 20 mm. However, the radius r is not necessarily 20 mm, and the protrusion height h of the protrusion 36 (see FIG. 3), etc. A circle with an appropriate radius r may be selected in accordance with.

FIG. 5 is a photograph when the workpiece is put in the rotating drum 30 having the above-described configuration and the rotating drum 30 is rotated.
Note that coffee beans are used as objects to be processed.
As can be seen from FIG. 5, the coffee beans that have fallen toward the central projecting portion 36 are stirred left and right by the projecting portion 36, and vigorously moved away from the stainless steel surface of the rotating drum 30. It can be seen that it has been released into the air and can be heated efficiently and uniformly.

As mentioned above, although the heating apparatus 10 of this invention has been demonstrated based on specific embodiment, this invention is not limited to said specific embodiment.
For example, the usage of the heating device 10 of the present invention is not limited to roasting foods such as coffee beans and sesame, and it goes without saying that it may be used for usages that heat things other than food. .

  Further, the shape of the object to be processed is not limited to a particulate form such as coffee beans or sesame, and may be, for example, a powder form or a liquid form.

  Furthermore, although the case where the blades 37 are provided perpendicular to the bottom surface 34 has been described in the above embodiment, the blades 37 may be provided so as to be inclined with respect to the bottom surface 34.

  However, since the heated state of the workpiece is better when the blades 37 are provided perpendicular to the bottom surface 34 than when the blades 37 are inclined, the blades 37 are positioned with respect to the bottom surface 34. It is preferable that they are provided vertically.

  As described above, the present invention is not limited to the embodiments, and modifications and improvements as appropriate are also included in the technical scope of the present invention. It is clear from the description of the range.

DESCRIPTION OF SYMBOLS 10 Heating device 20 Cover part 21 Microwave waveguide 22 Microwave irradiation part 23 Beam 24 Support part 30 Rotating drum 31 Rotation drive means 32 Opening part 32a Flange part 33 Inner peripheral surface 33a Peripheral wall part 34 Bottom face 34a Bottom wall part 34b Rotating shaft 35 Insulating Material 36 Projection 36a Line Segment 37 Blade 37a Tip D1 Inner Diameter D2 Separation Distance Dp Depth h Projection Height HO Horizontal Plane L1, L2 Length L3 Distance LN Straight P Fixed Point P1, P2 End r Radius S Straight W1, W2 Diameter θ, θ1, θ2 Angle

Claims (4)

A rotating drum arranged such that the rotation axis is inclined obliquely upward so that the opening of the bottomed cylindrical internal space for accommodating the workpiece is located obliquely upward;
A microwave irradiation unit that irradiates microwaves from the opening toward the internal space, and a lid that covers the opening during microwave irradiation, and
The rotating drum is
An inner peripheral surface defining the internal space;
A bottom surface that closes an end of the inner peripheral surface located on the opposite side of the opening;
A projecting portion located at the center of the bottom surface and projecting from the bottom surface toward the opening;
A plurality of blades provided in the circumferential direction of the inner peripheral surface, and extending from the inner peripheral surface to the protruding portion side to guide the workpiece to the protruding portion ,
The protrusion has a shape in which a distance between two line segments corresponding to the side surface of the protrusion decreases from the bottom surface toward the opening when viewed in a cross section along the rotation axis. Have
Each of the two line segments is a part of a fastest descending curve . A part of the fastest descent curve is a straight line in which the angle θ1 on the protrusion side with respect to the bottom surface is within the range of angle θ2 ± 5 degrees when the inclination angle of the bottom surface with respect to the horizontal line intersecting the bottom surface is the angle θ2. The heating device according to claim 1 , wherein the heating device is based on a part of a cycloid curve drawn as a straight line passing through the center of rotation of the circle. The blade is a flat plate,
The vanes heating apparatus according to claim 1 or claim 2, characterized in that the tip portion of the protruding portion is spaced from the protrusion. The heating apparatus according to claim 3 , wherein a separation distance between the tip portions of the adjacent blades is at least longer than a wavelength of the microwave.