JPH052077Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applied to a roasting device for roasting coffee beans and the like.

(Prior Art) When cooking coffee beans, the coffee beans are heated (roasted) and then quickly cooled to bring out the flavor, aroma, etc. of the coffee beans. In this case, how to set the roasting temperature, roasting time, cooling characteristics after roasting, etc. is an important factor in improving the quality of coffee beans.

And, as a conventional coffee bean roasting device,
One that heats coffee beans with a rod-shaped heater (Jikko Sho 63-17356) and one that roasts coffee beans by moving them to one side in a roasting drum (Sho 60-
No. 41117) is known.

(Problem to be solved by the invention) However, with conventional roasting devices, the coffee beans are not sufficiently stirred in the roasting drum, so the amount of radiant heat that the coffee beans receive from the heater is small, and If the coffee beans are pushed to one side in the other direction, there is a problem in that the roasting becomes insufficient and requires a long roasting time.

Furthermore, in conventional roasting equipment, the heating means is a rod-shaped heater or burner, which makes it difficult to roast the entire coffee bean evenly and evenly from the surrounding area. However, there is a problem in that it is difficult to make the coffee beans receive heat.

The present invention was developed to solve these problems by making some of the coffee beans fly into the air inside the roasting drum, and distributing the rest uniformly in the axial direction of the roasting drum. By promoting the heat receiving effect of the coffee beans and by providing a heating means to surround the roasting drum, radiant heat from the heat generating side is efficiently applied to the coffee beans along with convection heat, and then the heating means is provided below the roasting drum. By rapidly cooling coffee beans using a cooling drum, it is possible to achieve uniform roasting without uneven roasting in a short time.

(Means for Solving the Problems) The coffee bean roasting apparatus of the present invention for solving the above-mentioned problems includes a heating furnace formed of a heat insulating material, a heating furnace provided rotatably in the heating furnace, and a large number of a bottomed cylindrical roasting drum having small holes; an infrared heater that is attached to the inner wall of the heating furnace so as to surround the roasting drum and heats the roasting drum; and a rotating shaft of the roasting drum. a bottomed cylindrical cooling drum having a large number of small holes and forming two shafts parallel to each other and interlocking with the rotating shaft via an interlocking means; a stirring blade which is provided and which, when the drum rotates, causes at least a part of the coffee beans to fly up into the air within the drum while reciprocating the remaining part in the direction of the drum axis to uniformly diffuse and distribute the coffee beans; It is characterized by being equipped with an intake blower that sucks in air.

(Function) According to the heating device of the present invention, a part of the coffee beans is lifted into the air in the bottomed cylindrical roasting drum having many small holes, and the rest of the coffee beans are moved to the drum by the stirring blade. By distributing it uniformly in the axial direction, the coffee beans in the roasting drum can effectively receive the radiant heat from the planar ceramic infrared heater surrounding the roasting drum from above, and the intake blower The heat convection within the roasting drum is promoted by the negative pressure generated within the roasting drum, which is sucked in by the roasting drum, thereby uniformly roasting the coffee beans in a short time. Next, rapid cooling is performed in a bottomed cooling drum having a large number of small holes provided at the bottom thereof.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

As shown in FIGS. 1 to 3, a funnel-shaped hopper 2 for charging coffee beans to be heated is provided at the upper part of a frame 1 of the heating device, and this hopper 2 is formed by an inner peripheral surface. The passage gradually narrows from the middle toward the bottom, and its lower end 2a is connected to the upper end 3a of the coffee bean passage 3.

The coffee bean passage 3 extending vertically downward opens into a furnace end opening surface 10a of a heating furnace 10, which will be described later, via an inclined passage 3b that is bent and inclined from the middle. On the other hand, an exhaust passage 5 extending horizontally backward (to the left in FIG. 1) branches off from the upper end of the coffee bean passage 3, and a shutter 6 is provided at the branching point to selectively switch between coffee bean input and exhaust discharge.
is attached so as to be freely swingable around a fulcrum 7 by a shutter handle 6a.

A bottomed cylindrical roasting drum 13 provided in the heating furnace 10 is arranged so that its axis of rotation is horizontal, and its opening surface 14 faces parallel to the above-mentioned furnace end opening surface 10a. It is provided through a gap. This gap is adjusted to, for example, 1 to 2 mm. Thereby, the coffee beans from the above-mentioned inclined passage 3b are taken into the roasting drum 13 from the hearth opening surface 10a through the opening surface 14, and at this time, the coffee beans are prevented from falling through the gap.

The cylindrical body 15 of the roasting drum 13 is made of punched metal and has a large number of small holes 4 that communicate between the inside and outside of the drum and are large enough that coffee beans cannot pass through.
The bottomed disk portion 16 of the roasting drum 13 is formed in a disk shape using punching metal, and a large number of small holes 43 are formed to communicate between the inside and outside of the drum. The aperture ratio of the large number of small holes 43 formed in the cylindrical body 15 and the bottomed disk portion 16 is 20
This is to promote the heating of the coffee beans in the drum while regulating the heat passing through the small holes, in order to prevent the surface from hardening before the moisture and carbon dioxide gas inside the beans are completely removed due to the strong radiant heat from the infrared heater 12, which is a heating element such as a flat nichrome wire (described later) embedded in the ceramics.

On the inner circumferential wall of the cylindrical body 15, there are two thin plate belt-shaped feed blades 30a and 30b having a predetermined width, which feed the coffee beans taken into the drum 13 from the opening surface 14 into the bottomed disc portion 16 side during rotation. They are arranged in a spiral at positions 180 degrees offset from each other with respect to the axis. Two thin strip-shaped return vanes 31a and 31b provided on the inner circumferential wall in a direction intersecting the sending vanes 30a and 30b push the coffee beans taken into the drum 13 toward the opening surface 14 as the drum rotates. It is something. A large number of small holes are opened in the sending blades 30a, 30b and the return blades 31a, 31b.

Boss portion 16 of bottomed disc portion 16 of roasting drum 13
A drive shaft 17 extending into the drum is fixed to a, a spoke 18 extending radially is provided in the middle of the drive shaft 17, and the other end of the spoke is fixed to the outer peripheral end of the cylindrical body 15. The roasting drum 13 is fixedly supported on the drive shaft 17 by the spokes 18 .

Drive shaft 17 fixed to roasting drum 13
is rotatably supported by bearings 19 and 20 through the insertion hole 10c of the furnace end closing surface 10b, and a sprocket 21 is fitted on the outside of these bearings 20. This sprocket 21 is driven by a chain 22 wrapped around a sprocket 23 driven by a drive motor 24.

An infrared heater 12 in which a heating element such as a nichrome wire is buried in ceramics and has a planar shape extending in the front-rear direction of the heating furnace 10 surrounds the roasting drum 13 on the inner circumferential wall surface 10b of the bottomed cylindrical heating furnace 10. There are many. This infrared heater 12
It is desirable to surround approximately 2/3 of the circumference around the top of the roasting drum, and not to provide it at the bottom of the roasting drum. This is to prevent the husks and chaffs of coffee beans generated in the roasting drum from falling through the punching metal, and also to prevent contamination of the infrared heater and the occurrence of an unpleasant odor from burning coffee beans. . Further, when the infrared heater 12 generates heat, radiant heat is radiated through the small holes of the rotating roasting drum 13, together with the effect of the stirring blades inside the drum. For this reason, moisture, carbon dioxide, etc. generated from the inside of the coffee bean as heating progresses will not form a boundary film on the surface of the coffee bean, and the inside of the coffee bean will remain in an unroasted state. There is no.

Directly below the hearth opening surface 10a of the heating furnace 10,
A temperature sensor 35 is provided on the inner wall of the hearth facing the opening surface 14 of the roasting drum 13.

A discharge port 60 from which roasted coffee beans are taken out is opened at the end of the furnace located below the opening surface 10a of the heating furnace 10, and a discharge door 61 that is opened and closed by a handle 62 is connected to the discharge port 60. Moving axis 61
It is attached so that it can rotate freely around a. A discharge chute 65 is attached to the outside of the discharge port 60 so as to be inclined diagonally downward for allowing coffee beans after roasting to flow into a cooling drum 25 to be described later.

On the other hand, the cooling drum 25 provided directly below the roasting drum 13 is arranged so as to have two parallel axes in the case 44, has the same configuration as the roasting drum 13, and has feeding blades 46a, 46b inside. and return blades 47a, 47b. When the drum rotates, the feeding blades 46a and 46b feed the coffee beans inside the drum to the left in FIG.
7b sends the coffee beans to the right in FIG. The cooling drum 25 is interlocked with the drive shaft 17 via a drive shaft 58, a sprocket 48, and a chain 49.

The case 44 is connected to the intake blower 5 via a hose 50.
1 and is opened to an exhaust port 53. There is a duct switching valve 5 near the suction hole of the intake blower.
4 are provided.

When the duct switching valve 54 is opened to the cooling side, the air inside the case 44 housing the cooling drum 25 is transferred to the hose 50 by the suction action of the blower 51.
and is discharged to the outside through the exhaust port 53. At this time, negative pressure is generated inside the case 44, so the case 44
Coffee bean shells and chaff that have fallen through holes provided in the cooling drum in the bottom plate 56 of No. 4 are sucked and removed. This suction also speeds up the cooling of the coffee beans.

When the duct switching valve 54 is switched to the roasting drum side, the exhaust gas generated in the roasting drum 13 during roasting ascends from the opening surface 14 through the inclined passage 3b and the coffee bean passage 3, and flows into the coffee bean passage 3. It passes through the connected exhaust passage 5, is sucked by a blower 51 provided on the downstream side of this exhaust passage 5, and is discharged to the outside through an exhaust port 53.

Next, the operation of the embodiment of the present invention will be explained.

Coffee beans introduced from the hopper 2 pass through the coffee bean passage 3 and exit from the inclined passage 3b to the opening surface 10a.
It flows into the roasting drum 13. The coffee beans flowing into the roasting drum 13 are
3 is rotated, it is heated (roasted) by the radiant heat from the infrared heater 12 while being stirred by the sending blades 30a, 30b and return blades 31a, 31b.

At this time, the coffee beans in the roasting drum 13 are
A part of it is lifted into the air inside the drum, and the rest is sent to the feed blade 30 as the drum rotates.
a, 30b to the bottomed disk portion 16 side,
It is pushed toward the opening surface 14 by the return blades 31a and 31b. Therefore, the coffee beans are evenly reciprocated in the direction of the drum axis, and while being agitated and distributed, some of the coffee beans are thrown into the air, so that the radiant heat from the infrared heater 12 allows the roasting to proceed uniformly and in a short time. Ru.

When roasting is finished, when the handle 61 is opened to the position shown by the dashed-dotted line in FIG. will be moved.

The coffee beans moved into the cooling drum 25, which is substantially separated from the atmosphere outside the apparatus by the case 44, are partially blown up into the air as the drum rotates, and are also swept up by the sending blades 46a, 46b, return blades 47a, 47b, it is uniformly diffused and distributed in the direction of the drum axis. At this time, remaining shells mixed with the roasted beans fall onto the bottom plate 56 through the small holes of the drum. Then, the suction force of the intake blower 51 sucks the shells etc. on the bottom plate 56 of the case 44, and the circulating air is lifted into the air by the stirring blades or takes away heat from the coffee beans that are diffused in the front and back direction. The stolen air is hose 5
0, passes through the blower 51, and is discharged from the exhaust port 53. Therefore, the coffee beans in the cooling drum 25 do not attract or draw in the atmosphere outside the roasting device, so not only is the cooling speeded up, but there is also almost no adsorption of moisture or foreign odors in the atmosphere.

(Effects of the invention) As explained above, according to the coffee bean roasting apparatus of the invention, the stirring blades work in the roasting drum to uniformly diffuse and distribute coffee beans, and part of the coffee beans are suspended in the air. Because it makes you soar,
Radiant heat from the planar infrared heater that surrounds the coffee beans and convection heat inside the roasting drum can be effectively applied to the coffee beans, resulting in uniform roasting in a short time, resulting in even flavor and aroma. This has the effect of making it possible to achieve uniform roasting without escaping.

In addition, the coffee beans that have finished roasting in the cooling drum are lifted into the air by stirring blades installed in the cooling drum, and the coffee beans are evenly distributed by reciprocating in the axial direction and are then circulated through the air by the intake blower. Since the coffee beans are cooled effectively and quickly due to the endothermic action of the roasted coffee beans, the quality of the roasted coffee beans, such as their flavor and aroma, can be further improved. Furthermore, the present invention can be applied to roasting not only coffee beans but also granular foods such as soybeans, wheat, barley, and sesame seeds.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing an embodiment of the present invention;
Fig. 2 is a schematic front view seen from the direction of the arrow in Fig. 1, and Fig. 3 is a schematic plan view seen from the direction of the arrow in Fig. 1. 10 ... heating furnace, 12 ... planar infrared heater,
13: Roasting drum, 25: Cooling drum, 3
0, 46 ... Feed blade (mixing blade), 31, 47
...Return blade (mixing blade), 51...Intake blower.

Claims (1)

[Scope of Claim for Utility Model Registration] A heating furnace formed of a heat insulating material, a bottomed cylindrical roasting drum rotatably provided in the heating furnace and having a large number of small holes, and this roasting drum. A planar infrared heater that is attached to the inner wall of the heating furnace so as to surround the drum, and has a heating element such as a nichrome wire embedded in ceramics,
an infrared heater that heats the roasting drum; and a bottomed cylindrical cooling device that has two axes parallel to the rotation axis of the roasting drum and that is interlocked with the rotation axis via an interlocking means and that has a large number of small holes. a drum; provided spirally on the inner circumferential wall of the roasting drum;
a stirring blade consisting of a sending blade and a return blade having small holes that increase air permeability in the roasting drum and allow infrared rays generated from the infrared heater to directly irradiate coffee beans in the drum; Provided spirally on the inner peripheral wall,
A coffee characterized by comprising: a stirring blade consisting of a sending blade and a returning blade having small holes for increasing air permeability inside the cooling drum; and an intake blower sucking air inside the roasting drum or the cooling drum. Bean roasting equipment.