Roasting equipment

Abstract

To provide a piece of roasting equipment which has a simple structure by taking into consideration of an environment and an energy cost, which in addition can evenly heat to a center part of a roasted item even a roasted item has a hard and multilayer construction like coffee green beans, and which has low variability in a roast degree as an aggregation of coffee beans.SOLUTION: A piece of roasting equipment includes: a carbon material-made cylindrical body constituting a roasting chamber for storing an edible plant material for roasting; heating means which is heating means for heating the carbon material-made cylindrical body and which is installed to get into contact with the carbon material-made cylindrical body; and blowing means which supplies an air stream capable of circulating the edible plant material in the roasting chamber. The blowing means is a combination with the blower and an air duct which can deliver into the roasting chamber the air stream delivered from the blower. The air duct is desirably arranged so that an air stream to become a tornado flow can be formed.SELECTED DRAWING: Figure 6

Description

【Technical Field】 【0001】 The present invention relates to a roasting apparatus used for roasting edible plant materials such as beans like coffee beans and cocoa beans, and tea leaves like roasted green tea, which become food through roasting. 【Background Art】 【0002】 Beans (such as coffee beans and cocoa beans), seeds (such as sesame seeds and sunflower seeds), nuts (such as walnuts and almonds like chestnuts, gingko nuts, etc.) and tea leaves (such as roasted green tea, etc.) become suitable for consumption through a roasting process. Roasting is a type of heating process, which means heating and drying food ingredients without using oil or water as a heat medium. By roasting, the chemical properties of proteins in food change and the flavor changes. 【0003】 In the case of coffee beans, since the degree of roasting greatly affects the taste and aroma, it is important to adjust the heating temperature in the roasting process. Furthermore, in an aggregate such as coffee beans, it is required that the beans roasted simultaneously are roasted equally, that is, the variation in the degree of roasting is small. 【0004】 Conventionally, a skilled roaster adjusted the temperature and roasting time while checking the aroma, sound, appearance of the beans, etc. during roasting. There is a need for a roasting apparatus that can roast without relying on the five senses of such a skilled person. Therefore, various proposals have been made for roasting machines or roasting apparatuses, including heating means, temperature control means, and drive mechanisms such as stirring, rotation, and vibration. 【0005】 As a roasting apparatus, a device that directly heats (direct firing type) with a flame such as a gas stove or a gas burner while rotating a container or drum called a roasting chamber, heats by passing hot air through the roasting chamber (hot air type), or combines hot air and a flame (semi-hot air type) is generally used. 【0006】 However, in recent years, due to the demand for carbon neutrality, there has been a growing desire for roasting equipment that does not use flames, and for hot-air roasting equipment, devices that use air heating means other than combustion as the means of generating hot air have been proposed. 【0007】 For example, there are roasting apparatuses that use a superheated steam generating means (Japanese Patent Publication No. 2007-143550: Patent Document 1), roasting apparatuses that utilize microwave heating such as a microwave oven (for example, Japanese Patent Publication No. 2001-204451 (Patent Document 2)), roasting apparatuses equipped with microwave heating and a means for stirring the roasted material in the roasting container (Japanese Patent Publication No. 2005-137303 (Patent Document 3)), and roasting apparatuses that use hot air and microwave heating in combination (Japanese Patent Publication No. 2021-500067 (Patent Document 4)). 【0008】 Japanese Patent No. 4847622 (Patent Document 5) proposes a roasting apparatus that uses a combination of a blower and an electric heater as a means of generating hot air, and injects the generated hot air into the roasting chamber (roasting container) through a nozzle. In this document, the roasting chamber is fixed, and the beans inside are circulated by a hot airflow. By constructing the roasting chamber with heat-resistant glass, the condition of the beans inside the chamber can be observed. 【0009】 Furthermore, Patent No. 6679302 (Patent Document 6) proposes placing an infrared sensor on the outside of a glass roasting container to detect the temperature of the roasting object itself by receiving infrared rays from the object to be roasted, and controlling the temperature of the heating means (heater). 【0010】 On the other hand, various devices have been proposed that use far-infrared radiation to roast hard materials such as coffee beans in order to obtain a rich flavor. For example, WO2021 / 124978 (Patent Document 7) proposes using a graphite drum as the roasting chamber. Patent Document 7 discloses that in a roasting apparatus using a graphite drum and direct-fire or hot-air heating as the heating method, the flavor was superior to that of roasting apparatuses using glass or metal roasting chambers, possibly due to the far-infrared effect of the graphite drum, which allowed for more uniform heating of the roasted beans and even heating of the inside of the beans. [Prior art documents] [Patent Documents] 【0011】 [Patent Document 1] Patent No. 2007-143550 [Patent Document 2] Japanese Patent Publication No. 2001-204451 [Patent Document 3] Japanese Patent Publication No. 2005-137303 [Patent Document 4] Special Publication No. 2021-500067 [Patent Document 5] Patent No. 4847622 [Patent Document 6] Patent No. 6679302 [Patent Document 7] WO2021 / 124978 [Overview of the Initiative] [Problems that the invention aims to solve] 【0012】 Microwave heating utilizes the heat generated by the material being roasted. Because various reactions occur depending on the heating temperature, such as with coffee beans, temperature control to prevent overheating is generally difficult. 【0013】 Heating with superheated steam has the advantage of being able to heat quickly and uniformly, but it has the problem of higher energy costs compared to generating superheated steam using combustion gases. In addition, precise temperature control of the roasted product itself is generally difficult. 【0014】 In this regard, with the hot air heating method proposed in Patent Documents 5 and 6, the temperature inside the roasting chamber can be controlled by controlling the heater temperature. However, the roasting apparatus proposed in Patent Documents 5 and 6 uses a glass container as the roasting chamber. Because glass has low thermal conductivity, heating the inside of the beans via hot air presents challenges in terms of productivity and energy costs. 【0015】 On the other hand, Patent Document 7, which discloses a roasting apparatus using a graphite drum, employs a hot air method and a direct flame method as heating methods. Such heating methods cannot meet the recent demands for carbon neutrality. Patent Document 7 proposes an induction heating method as a heating method that does not use combustion gases, but it does not disclose in detail the relationship between the graphite drum, which is mounted so as not to hinder the rotation of the drum, and the rotating drum. 【0016】 This invention has been made in view of the above circumstances, and its purpose is to provide a roasting device with a simple structure that takes into consideration the environment and energy costs, which can evenly heat hard, multi-layered roasting materials such as green coffee beans to the center, resulting in less variation in the degree of roasting of the coffee beans as a whole. [Means for solving the problem] 【0017】 The inventors of the present invention have conducted various studies on heating means, stirring means, and roasting containers in order to provide a roasting apparatus that allows for easy control of the heating temperature and reduces uneven roasting, even without using gas combustion as a heating means, and have arrived at the present invention. 【0018】 In other words, the roasting apparatus of the present invention has the following embodiments. (1) A cylindrical body made of carbon material that constitutes a roasting chamber for storing edible plant materials to be roasted; heating means for heating the cylindrical body made of carbon material, the heating means being attached so as to contact the cylindrical body made of carbon material; and a roasting apparatus provided with blowing means for supplying an air flow capable of refluxing the edible plant materials in the roasting chamber. The blowing means is a combination of a blower and a blowing path through which the air flow blown from the blower can be introduced into the roasting chamber. The blowing path is composed of a main blowing path that penetrates the inside of the wall surface of the cylindrical body made of carbon material in the height direction of the cylindrical body, and blowing holes that communicate from the through-passage into the roasting chamber. The through-passage and the blowing holes are arranged such that the air flow blown from the blower can pass through the through-passage and be discharged from the blowing holes into the roasting chamber to form a tornado flow. road A roasting apparatus. The through-passage as the main blowing path is perforated at four locations at equal intervals in the circumferential direction of the cylindrical body, and it is preferable that 5 to 16 blowing holes are arranged at equal intervals in the height direction of the inner wall surface for each through-passage. The cylindrical body made of carbon material is preferably fixedly installed upright in the height direction of the cylindrical body. 【0019】 (2) The roasting apparatus according to the above aspect (1), wherein the heating means is a first heater embedded in the cylindrical body made of carbon material. 【0023】 (3) In the above aspect either a second heater for heating the air from the blower is provided in the blowing path. , arranged in the flow path from the blower to the roasting chamber A roasting apparatus. 【0024】 (4) A collecting portion for the roasted product is attached to the lower end of the roasting chamber, and a holding plate that operates to transfer the roasted product to the collecting portion is attached to the bottom surface of the cylindrical body made of carbon material in the above (1) to (3) A roasting apparatus having any one of the above aspects. Preferably, the holding plate has numerous micro-holes so that the airflow from the blower can enter and exit the roasting chamber through these micro-holes. 【0025】 (5) The aforementioned air blowing means is disposed on the lower end side of the carbon material cylindrical body, and above the carbon material cylindrical body, there is a powder separation means for separating the dust of the edible plant material generated by roasting (1)~ (4) A roasting apparatus having any of the following forms. 【0026】 (6) The aforementioned air supply means includes a blower; an air supply passage that can supply the airflow discharged from the blower into the roasting chamber; a suction passage that can draw air from the collection section using the blower; and a switching means for switching between the air supply passage and the suction passage as described in (1)~ (5) A roasting apparatus having any of the following forms. [Effects of the Invention] 【0027】 The roasting apparatus of the present invention has a roasting chamber constructed of a carbon material that has high thermal conductivity and can emit far-infrared rays. As a result, the roasted material is heated by the hot air and far-infrared rays flowing through the roasting chamber. By using far-infrared heating in combination, it is possible to heat even the inside of multi-layered roasted material such as green coffee beans, enabling roasting with a rich flavor. Furthermore, by creating a tornado-like flow of hot air within the roasting container, the beans inside the roasting chamber can be efficiently agitated. Combined with far-infrared heating from the carbon material roasting chamber, this reduces uneven roasting within a group of roasted beans. [Brief explanation of the drawing] 【0028】 [Figure 1] This is a schematic diagram showing the configuration of one embodiment of the cylindrical roasting section used in the roasting apparatus of the present invention. [Figure 2] This is a schematic diagram illustrating another operating state of the roasting section in the embodiment shown in Figure 1. [Figure 3] Figure 1 is a top view of the cylindrical roasting chamber. [Figure 4]Figure 3 shows a cross-sectional view (viewed along line AA) of the cylindrical roasting chamber, cut in the height direction. [Figure 5] This is a schematic diagram showing the configuration of one embodiment of a cartridge-type heater. [Figure 6] This is a block diagram showing the configuration of one embodiment of the roasting apparatus of the present invention. [Modes for carrying out the invention] 【0029】 The roasting apparatus of the present invention comprises: a cylindrical body made of carbon material constituting a roasting chamber for storing edible plant material to be roasted; a heating means for heating the cylindrical body made of carbon material, the heating means being attached so as to be in contact with the cylindrical body made of carbon material; and a blowing means for supplying an airflow that can circulate the edible plant material within the roasting chamber. 【0030】 One embodiment of the roasting section, which is the main component of the roasting apparatus of the present invention, will be described with reference to Figures 1 to 4. 【0031】 The roasting unit 100 shown in Figure 1 consists of a cylindrical body 1 made of carbon material that constitutes the roasting chamber 1A, and a collecting body 2 attached to the lower end of the cylindrical body 1 made of carbon material that constitutes a collecting unit 2A where roasted material is collected. 【0032】 The top surface of the collection unit 2 and the bottom surface of the cylindrical body 1 have approximately the same diameter, and the roasting chamber 1A and the collection unit 2A are separated by a retaining plate 3. The holding plate 3 is pivotally supported on the wall of the cylindrical body 1 so that it can move from a horizontal position during roasting (see Figure 1) to a tilted position after roasting (see Figure 2) that allows the roasted material to be transferred (dropped) to the collection unit 2A. 【0033】 The wall surface of the cylindrical body 1 has a through passage 9 that penetrates the wall surface of the carbon material cylindrical body 1 in the height direction and serves as the main airflow channel, and a communication hole 10 that connects the through passage 9 to the roasting chamber 1A and serves as an airflow hole that discharges the airflow from the main airflow channel. 【0034】 As shown in Figure 3, the through passages 9 are drilled at four locations, spaced equally apart in the circumferential direction, and the four through passages 9a, 9b, 9c, and 9d are arranged so that they form the vertices of a square in the cross-section in the circumferential direction (direction perpendicular to the height direction). 【0035】 Then, from each of the through passages 9a, 9b, 9c, and 9d, communication holes 10a, 10b, 10c, and 10d are drilled, respectively, which communicate with the inside of the cylindrical body 1 (roasting chamber 1A) and serve as air supply holes to the roasting chamber 1A (see Figure 4). Preferably, 5 to 16, and more preferably 8 to 12, communication holes 10 are arranged in rows at equal intervals in the height direction for each through passage. 【0036】 Furthermore, a deep hole 11 is cut into the wall of the cylindrical body 1 to accommodate a stick-type heater, which is the first heater. This deep hole 11 serves as the stick-type heater housing section 11. In the configuration of the roasting section 100, the stick-type heater housing section 11 is cut into six locations, spaced equally apart in the circumferential direction. 【0037】 The inner diameter of the through passage 9 is usually 10 to 25 mm, preferably 15 to 20 mm. The diameter of the connecting hole 10 is usually 4 to 10 mm, preferably 6 to 8 mm. If the connecting hole 10 is too narrow, the airflow flux of the discharged air becomes faster, which tends to cause localized heating. On the other hand, if the connecting hole 10 is too wide, the number of connecting holes 10 will be insufficient in relation to the height of the cylindrical body 1, which may result in insufficient generation of tornado flow based on the airflow (outflow) from each connecting hole 10. 【0038】 The carbon material cylindrical body 1 that constitutes the roasting section 1A has a bulk density of 1.2 to 2.2 g / cm³. 3 Preferably, 1.3 to 2.0 g / cm³ 3 , more preferably 1.5 to 1.9 g / cm³ 3 It is composed of carbon material. Furthermore, the thermal conductivity at 25°C is 60 W / m·K or higher, preferably 80 W / m·K or higher, more preferably 100 W / m·K or higher, and the upper limit is usually preferably 200 W / m·K or lower. 【0039】 Examples of such carbon materials include graphite, carbon fiber reinforced carbon composites (CC composites), glassy carbon (non-graphitized carbon obtained by carbonizing thermosetting resins such as phenolic resins), and porous carbon (porous carbon graphite). Of these, graphite and CC composites are preferred, and graphite is more preferred. As for graphite, natural graphite, artificial graphite, charcoal, pitch, and carbonized synthetic resins can be used. 【0040】 Artificial graphite that satisfies the above-mentioned range of bulk density and thermal conductivity is available on the market. A cylindrical body 1 having the above-described structure can be manufactured by cutting a block of artificial graphite, which has been pre-formed into a desired shape, to the specified dimensions. If it is composed of CC composite, the necessary processing may be performed after thermosetting the composite material, or the necessary processing may be performed in a semi-cured state, followed by complete curing to impart the desired shape. 【0041】 Furthermore, the inner and outer walls of the cylindrical body 1, which constitutes the roasting chamber 1A, may be coated as needed with ceramic coatings such as alumina, silica, or zirconia, glass coatings, glassy carbon coatings, polysiloxane-based heat-resistant coatings, or pyrolysis carbon graphite coatings. 【0042】 The thickness of the cylindrical body 1 is not particularly limited, but is usually 20 to 50 mm, preferably 20 to 30 mm. If it is too thin, it will be difficult to embed the stick-type heater. On the other hand, if it is too thick, the amount of heat required for heating will increase, so from an energy-saving standpoint, it is sufficient to have a thickness that is necessary and sufficient to provide the heater housing, through-passage, and communication holes. 【0043】 The shape of the collection body 2 is not particularly limited, but in the roasting section 100 shown in Figures 1 and 2, it is a cone shape obtained by cutting a cylinder diagonally. In the cone-shaped collection body 2, as shown in Figure 2, when the holding plate 3 is tilted, an outlet 5 is provided for removing the roasted product transferred from the roasting chamber, and this outlet 5 can be opened and closed by an opening / closing door 5a. 【0044】 On the inclined surface of the conical collection body 2, an inlet 4 is provided at a position corresponding to the center of the bottom surface of the roasting chamber 1A, into which an airflow is blown to heat and circulate the edible plant material to be roasted in the roasting chamber 1A. 【0045】 The materials used to construct the collection unit 2 are not particularly limited. It may be made of the same material as the cylindrical body 1 that constitutes the roasting section 1A, or it may be made of metal such as iron or stainless steel, due to the ease of processing for attaching the cylindrical body 1 and the outlet 5. 【0046】 The holding plate 3 has numerous micro-pores 3a to prevent the pressure difference between the roasting chamber 1A and the collection section 2A from becoming too large. 【0047】 The materials used to construct the retaining plate 3 are not particularly limited. It may be made of the same material (carbon material) as the cylindrical body 1 that constitutes the roasting section 1A, or, due to the ease of mounting the cylindrical body 1 and processing the outlet 5, it may be made of the same type of metal as the collection body 2. 【0048】 An example of the heater (first heater) housed in the heater housing section 11 is a cartridge-type heater 12 as shown in Figure 5. The cartridge heater shown in Figure 5 has a cylindrical heating element 12a, which generates heat when an electric current is applied, such as a nichrome wire, inserted into a cylindrical outer tube 12b, with lead wires 12c extending out to supply power to the heating element. The lead wires 12c are brought out to the upper surface of the cylindrical body 1. 【0049】 Furthermore, the top surface of the cylindrical body 1 is closed off by a lid 6. The lid 6 that closes off the top surface of the cylindrical body 1 has an exhaust duct and an exhaust port 7 for discharging dust and roasting residue generated during roasting. The lid 6 is preferably made of the same carbon material as the constituent material of the roasting chamber 1A. Alternatively, it may be made of metal from the viewpoint of ease of processing and strength. 【0050】 The cover 6 closes the top side of the passage 9, but a portion corresponding to the opening of the heater housing 11 is left open, allowing lead wires 12c for heating the heater housed in the heater housing 11 to be pulled out. 【0051】 [Roasting equipment] Next, an embodiment of the configuration of a roasting apparatus equipped with the roasting unit 100 having the above-described configuration will be explained with reference to Figure 6. 【0052】 The roasting apparatus shown in Figure 6 consists of a roasting section 100 having the above configuration; a blowing section 200 equipped with a blowing means for sending airflow (hot air) to the inlet 4; a separation section 300 for collecting residue (mainly chaff when the edible plant material being roasted is coffee beans) generated during roasting; and a hopper 30 for supplying the edible plant material to the roasting chamber 1A and a receiving section (chute) 40 for receiving the roasted material from the collection section 2A. 【0053】 The air blower unit 200 includes a blower 20, a heater (second heater) 21 for heating the air flowing into the roasting chamber 1A, an airflow control valve 22 provided in the airflow path connected to the inlet 4 to adjust the amount of air blown to the inlet 4, and a three-way switching valve 23 for selectively switching the airflow from the blower 20 to the heater 21 or to cool the roasted products collected in the receiving unit 40. 【0054】 The heater 21 preferably includes a temperature control means (temperature control controller: not shown). The temperature control means is preferably electrically or electronically connected to a temperature sensor (not shown) attached to the cylindrical body 1. 【0055】 The separation unit 300 is connected to an exhaust port 7 opened in the center of the lid 6 that closes the top surface of the roasting chamber 1A, and is equipped with a cyclone 31 that separates powder (chaff) mixed in the exhaust flow discharged from the exhaust port 7, an intake fan 32 that sends the exhaust flow to the cyclone 31, and a cock 33 that adjusts the exhaust flow rate and whether or not to exhaust. 【0056】 The cock 33 may be a lever that selectively switches between a supply passage communicating with the hopper 30 and an intake passage connected to the intake fan 32. 【0057】 [How to use the roasting machine] Next, we will explain how to roast coffee beans as a representative example of the material to be roasted, using the roasting apparatus shown in Figure 6. First, as shown in Figure 1, the cylindrical body 1 is heated by energizing the cartridge-type heater 12 with the holding plate 3 set in a horizontal position. Once the cylindrical body 1 has heated up to a predetermined temperature, green coffee beans are supplied from the hopper 30 to the roasting chamber 1A. 【0058】 A predetermined amount of green coffee beans is added, and the blower 20 and heater 21 are activated to blow hot air into the roasting chamber 1A. 【0059】 The hot air blown in from the inlet 4 passes through the through passage 9 and communication hole 10 of the cylindrical body 1 and is blown into the roasting chamber 1A. Here, the hot air blown out from the communication holes 10 (10a, 10b, 10c, 10d), which serve as air vents to the roasting chamber 1A, is blown into the roasting chamber 1 in the direction indicated by the black arrows in Figure 3. The airflow blown out from the four vertices of the rectangle in the direction of the thick black arrows swirls circumferentially within roasting chamber 1A and becomes an updraft, creating a tornado flow within roasting chamber 1A. This tornado flow causes the coffee beans inside roasting chamber 1A to circulate within the chamber. In parallel, hot air is also blown in from the micro-holes 3a of the holding plate 3, within the range of the pressure difference. 【0060】 Inside the roasting chamber 1A, the coffee beans are heated and roasted while circulating due to a heated cylindrical body 1 and a tornado-like flow of hot air. Roasting conditions such as heating time (roasting time) and airflow are set appropriately according to the configuration of the roasting apparatus and the type of product being roasted, including the type of coffee beans, the type of carbon material used for the cylindrical body 1 that makes up the roasting chamber 1A, and the size of the cylindrical body 1. 【0061】 By operating the intake fan 32 and cyclone 31 during roasting, air from inside the roasting chamber 1A is drawn in, and the cyclone 31 collects the green bean residue. This separates and removes chaff and other materials generated during roasting, thus reducing the effort required to clean the cylindrical body 1 after roasting and shortening the roasting interval. Furthermore, the degree to which the valve 33 is opened or closed allows for adjustment of the airflow rate and airflow force during roasting. 【0062】 At the end of the roasting process, the holding plate 3 is tilted to allow the roasted beans in the roasting chamber 1A to fall into the collection unit 2. At this time, the opening / closing door 5a is opened, and the roasted beans are collected through the chute 40 from the outlet 5. During collection, by switching the discharge direction of the three-way valve 23 from the second heater 21 to the open-to-the-atmosphere side, the heat from the roasted beans can be drawn in by the blower 20, allowing the roasted beans to be cooled. 【0063】 [Other embodiments] In the above embodiment, the roasting chamber was constructed using a cylindrical body made of carbon material, but a cylindrical body with a shape other than a cylinder (for example, a rectangular prism) may also be used. 【0064】 Furthermore, while the configuration for generating a tornado flow in the cylindrical body 1 was a combination of four through passages 9a, 9b, 9c, and 9d and communication holes 10a, 10b, 10c, and 10d, the present invention is not limited to this. Also, the arrangement pattern of the through passages is not limited to the patterns shown in Figures 3 and 4, as long as it is a pattern that can generate a tornado flow. 【0065】 Furthermore, in the roasting apparatus of the present invention, as a means of generating a tornado flow, the airflow blown into the cylindrical body is configured to be blown out from the vertices of a square inscribed inside the cylindrical body, with numerous through passages arranged in the height direction of the cylindrical body. However, the present invention is not limited to this, and other means of generating vortices may be used. 【0066】 Furthermore, in the embodiment shown in Figure 6, the air blown from the blower 20 was heated by the heater 21 and then blown into the roasting chamber 1A as hot air. However, instead of the heater 21, an air conditioner equipped with a temperature control means may be used. In this case, either cold air or hot air can be blown into the roasting chamber 1A. By blowing in hot air during roasting and cold air after roasting, the roasting chamber 1A can be cooled in a short time, and the roasting interval can be shortened. 【0067】 In the roasting apparatus shown in Figure 6, the air blowing section 200 was configured to cool the roasted material collected in the receiving section 40 using a three-way valve 23. However, the roasting apparatus of the present invention is not limited to this configuration. The air blowing section 200 can be configured as long as it includes a blower and an airflow blown from the blower that is heated and then sent into the roasting chamber. 【0068】 The roasting apparatus of the present invention, having the configuration described above, uses hot air as a heating means and also heats the roasted material by far-infrared radiation by constructing the roasting chamber with a carbon material that has excellent thermal conductivity. Therefore, even if the roasted material is a bulky, multi-layered mass like green coffee beans, the heat can penetrate to the center of the bean through its fine pores, allowing it to be heated to the center without excessively heating the surface. This means that the difference in heat energy received depending on the position and state of the beans in the roasting chamber is small, and therefore, variations in the degree of roasting of the roasted material as a whole can be suppressed within the same batch. 【0069】 Furthermore, since the roasting apparatus of the present invention agitates the roasted material using a tornado-like flow, the cylindrical body constituting the roasting chamber can be used in a stationary state. Therefore, a drive mechanism and driving energy for rotating the cylindrical body are unnecessary, simplifying the apparatus and offering advantages in energy saving. 【0070】 Furthermore, conventionally, achieving sufficient roasting with hot air alone required a large amount of energy for generating the hot air, which tended to hinder energy saving. However, in this invention, a carbon material with excellent thermal conductivity is directly heated by a heater embedded in a cylindrical body, thus preventing the air inside the roasting chamber 1A from cooling down. Therefore, it is easy to maintain the hot air temperature inside the roasting chamber using the heat from the cylindrical body. In this sense, programming (temperature control) of roasting conditions becomes easier and less susceptible to the influence of ambient temperature and other factors. [Industrial applicability] 【0071】 The roasting apparatus of the present invention is a roasting apparatus that achieves carbon neutrality by utilizing direct heating of the carbon material cylindrical body constituting the roasting chamber and heating by hot air as heating methods. Since the roasting material is agitated using hot air for heating, there is no need to provide a rotating mechanism for the cylindrical structure that makes up the roasting chamber, resulting in a simpler configuration and an advantage in saving energy. Furthermore, based on a roasting chamber constructed of carbon material, it is possible to heat a group of multi-layered roasted materials, such as coffee beans, almost uniformly without the need for the meticulous heat adjustment and stirring of the roasted material that skilled roasters perform. Therefore, it is useful to obtain flavorful roasted beans with a roasting device that automatically adjusts roasting conditions such as temperature and time. [Explanation of symbols] 【0072】 1. Carbon material cylindrical body 1A Roasting Room 2 Collectibles 2A Collection Department 3 Holding plate 4. Air Inlet 5. Roasted Beans Dispenser 6. Lid 7 Exhaust vent 9 Main air flow channel (through channel) 10 Ventilation hole (communication hole) 11 Heater housing 12. Cartridge-type heater (first heater) 20 Blower 21 Heating means (second heater) 22. Airflow control means (airflow control valve) 23. Airflow switching mechanism (three-way valve) 30 hoppers 31 Cyclone 32 Intake fan 40 Shoot (receiving part) 100 Roasting Department 200 Air blower 300 Waste Collection Unit

Claims

[Claim 1] A cylindrical structure made of carbon material that constitutes a roasting chamber for storing edible plant materials to be roasted; A heating means for heating the carbon material cylindrical body, the heating means being attached so as to be in contact with the carbon material cylindrical body; and A blower means that supplies an airflow capable of circulating the edible plant material within the roasting chamber. A roasting device equipped with, The aforementioned air supply means is a combination of a blower and an air supply passage that can deliver the airflow blown from the blower into the roasting chamber. The aforementioned air passage consists of a main air passage comprising a through passage that penetrates the inside of the wall surface of the carbon material cylindrical body in the height direction of the cylindrical body, and an air vent that communicates with the roasting chamber from the through passage. The roasting apparatus is configured such that the through passage and the air outlet are arranged so that the airflow blown from the blower passes through the through passage and is discharged into the roasting chamber through the air outlet to form a tornado flow. [Claim 2] The through passages, which serve as the main airflow channels, are opened at four locations at equal intervals in the circumferential direction of the cylindrical body, The roasting apparatus according to claim 1, wherein the air vents are arranged in rows of 5 to 16 at equal intervals in the height direction of the wall surface for each of the through passages. [Claim 3] The roasting apparatus according to claim 1 or 2, wherein the carbon material cylinder is erected and fixed in the height direction of the cylinder. [Claim 4] The roasting apparatus according to claim 1 or 2, wherein the heating means is a first heater embedded in the carbon material cylindrical body. [Claim 5] The roasting apparatus according to claim 1 or 2, wherein a second heater for heating the air from the blower is provided in the airflow path in the flow path from the blower to the roasting chamber. [Claim 6] A collection unit for roasted beans is attached to the lower end of the roasting chamber. The roasting apparatus according to claim 1 or 2, wherein a retaining plate that moves to transfer the roasted material to the collection section is attached to the bottom surface of the carbon material cylindrical body. [Claim 7] The aforementioned blowing means is disposed on the lower end side of the carbon material cylindrical body, The roasting apparatus according to claim 1 or 2, further comprising a powder separation means above the carbon material cylindrical body for separating the dust of the edible plant material generated by roasting. [Claim 8] The roasting apparatus according to claim 6, further comprising: a suction passage capable of drawing air from the collection section; and a switching means for switching between the air supply passage and the suction passage. [Claim 9] The roasting apparatus according to claim 6, wherein the holding plate has a large number of micro-holes, and the airflow from the blower can enter and exit the roasting chamber through the micro-holes.

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