Bean roaster

Abstract

The present invention provides a compact bean roaster with low power consumption, low noise, high safety, and low price, and which is easy to use for an operator and convenient for daily maintenance. The bean roaster (20) includes a heating device (40) as a heat source for roasting, and a roasting blower (37) for sending high-pressure air to the heating device (40), and sending air heated to a high temperature by the heating device (40) to a roasting pan (23), and the heating device (40) is disposed directly below the central bottom of the roasting pan (23), an outlet (40b) for air blowing of the heating device (40) is opened upward and directly connected to an inlet (23a) for air suction formed in the central bottom of the roasting pan (23), and an inlet (40a) for air suction of the heating device (40) is located at the side of the heating device (40) and directly connected to a blowing outlet (37a) of the roasting blower (37). Therefore, the central bottom of the roasting pan (23) is in close proximity to the heating device (40), and in addition, since the heating device (40) is directly connected to the roasting pan (23), the hot air sent from the roasting blower (37) to the heating device (40) flows smoothly to the roasting pan (23), so that heat loss and wind resistance loss are extremely small.

Description

Technical Field

[0001] This invention relates to a bean roaster that is efficient, compact, and inexpensive, capable of roasting and cooling beans, especially nuts and coffee beans, uniformly and effectively in a short time. Background Technology

[0002] Previously, as a device that uses hot air to roast coffee beans or similar beans, a bean roasting machine disclosed in Japanese Patent No. 3637434 and the like has been proposed.

[0003] According to these devices, hot air is locally sprayed from the central bottom of the mortar-shaped roasting pan along the inner surface of the roasting pan, and the beans are heated and roasted effectively while being stirred. During the roasting process, the shells that are separated from the beans are transported to a filter device through a shell recovery pipe connected to the center of the upper cover of the roasting pan. The shells are separated from the air by the metal mesh filter of the filter device and enter the shell recovery box below.

[0004] In addition, the bean recycling structure after roasting in the roasting pot is configured to move upward to open and close the bean recycling hole in the center of the bottom of the roasting pot, so that the bean recycling hole is open, and the roasted beans fall from the bean recycling hole due to their own weight and are recycled to the cooling chamber side below through the cooling channel.

[0005] In addition, the cooling structure for the roasted beans is configured to cool the beans with air supplied by a roasting blower, and the air that has cooled the beans is sent to a filter through a bean cooling pipe and exhausted outside the roaster.

[0006] However, unlike drum roasters, traditional hot air roasters do not have a drive mechanism for rotating or tilting the drum. Therefore, compared to drum roasters, they offer a simpler structure, fewer malfunctions, and less uneven roasting of beans. However, since the bean mixing is done by air, a large-capacity, high-output roasting blower is required. In addition, since the heat from the exhaust of the roasting blower also increases, the heating device also needs to be a large-capacity, high-output unit.

[0007] In addition, because the baking blower and heating device are large-capacity and high-output, they are large and heavy. Therefore, these machines have to be placed at the bottom of the baking machine. This increases the distance between the baking pan and the heating device located at the top of the baking machine. Furthermore, if the weight distribution of the baking machine is taken into account, the baking blower and heating device need to be configured separately.

[0008] On the other hand, the baking blower and heating device, as well as the heating device and baking pan, are connected by a cylindrical flexible tube called a pipe. Due to the separation of these machines, the flexible tube becomes longer, resulting in increased air resistance and heat loss within the flexible tube.

[0009] In addition, in order to ensure that the heat and airflow in the baking pan are the amount required for baking, the baking blower and heating device need to be larger capacity and higher output type, which leads to the increase in size and price of baking machines, and also causes problems such as increased noise.

[0010] Furthermore, because the shell recycling pipe is connected to the center of the upper cover of the baking pan, not only does the overall height of the baking machine increase, but there are also daily maintenance problems such as the inability to easily remove the upper cover when cleaning the inside of the baking pan.

[0011] In addition, the shell recycling box used to recycle the shells fed into the filter device needs to be positioned in a relatively low position for easy operation. Therefore, the flexible tube connecting the upper cover and the shell recycling box is lengthened. Furthermore, due to the accumulation of shell and bean fragments in the bends of the flexible tube, not only is wind resistance loss generated, resulting in the inability to obtain the air volume required for roasting, but there is also an increased risk of fire caused by the burning of shells and other materials.

[0012] On the other hand, to prevent beans roasted to the specified degree from being roasted further, they need to be moved from the roasting pan to the cooling chamber for cooling as quickly as possible. However, in the structure of the roaster disclosed in Japanese Patent No. 3637434, when air for stirring the beans is continuously supplied from the center of the bottom of the roasting pan, the beans move diagonally upwards from the roasting pan, increasing the distance between them and the bean collection hole at the center of the bottom of the roasting pan. Therefore, there is a problem that it takes time to collect the roasted beans. To solve this problem, measures such as stopping the operation of the roasting blower or reducing the airflow to promote the weight of the beans to fall during bean collection can be considered. However, especially in the roasting of beans for iced coffee, due to the deep roasting, not only will oils flow out of the beans, causing them to fall under their own weight and taking time, but there is also a problem that the beans may stick to the roasting pan and remain inside.

[0013] In view of such problems, the roasting machine disclosed in Japanese Patent No. 3637434, which has a structure in which the opening and closing part of the central bottom of the mortar-shaped roasting pot is moved upward to open the bean collection hole, and the roasted beans in the roasting pot fall down due to their own weight and are guided to the cooling chamber below through the cooling channel, has not been adopted in actual roasting machines.

[0014] therefore, Figure 11 and Figure 12 The baking machine 1 shown is the one that was actually used and set up. Furthermore, Figure 11 This is a right-side view of baking machine 1. Figure 12 This is a right-side view of roaster 1, showing only the structural components and piping relationships involved in bean cooling.

[0015] Reference Figure 11 The structure for delivering hot air to the baking pan 2 will be described below. Specifically, ambient temperature air is compressed into the heating device 5 via a heating device inlet pipe 4 (size: φ50mm × 700mm) connected to the outlet side of the baking blower 3. Therefore, the air flowing into the heating device 5 is heated to over 300°C. This heated air is configured to be compressed from the center of the bottom of the baking pan 2 to the inside of the baking pan 2 via a heating device outlet pipe 6 (size: φ50mm × 1100mm).

[0016] In addition, refer to Figure 11 The air exhaust structure within the baking pan 2 will be explained. Specifically, air exhausted from the baking pan 2 along with the casing is delivered to the filter device 9 via the casing recovery pipe 7 (size: φ75mm × 700mm) connected to the upper part of the fixed cover 18. Therefore, the air is configured to be separated into the casing and the casing within the filter device 9, and the separated air is exhausted outside the baking machine 1 via the hot air exhaust pipe 10 (size: φ100mm × 500mm) from the exhaust manifold 11.

[0017] Furthermore, the hot air heated to over 300°C by the heating device 5 will drop in temperature as it passes through the outlet pipe 6 of the heating device. Therefore, the outlet pipe 6 of the heating device is covered with insulation material (not shown). Nevertheless, in addition to heat loss, even if the baking blower 3 has a large air volume, the air temperature still needs to reach over 300°C. Therefore, the internal configuration of the heating device 5 is a large-capacity heating device with three-phase 200V·12kW.

[0018] Next, we will refer to Figure 11 and Figure 12 The cooling structure for roasted beans will be explained below. Beans roasted to the desired roasting degree in the roasting pan 2 are collected in the bean collection box 13 via the bean collection door (not shown) located on the inclined surface of the roasting pan 2, and then through the bean collection channel 12. The bottom surface of the bean collection box 13 is formed of perforated metal plate material (not shown), which has numerous holes of a size that prevents beans from passing through. When the cooling blower 14 is running, room temperature air is drawn into the bean collection box 13 from above through the first bean cooling pipe 15 (size: φ100mm × 800mm) below the bean collection box 13, thus forcibly cooling the beans inside the bean collection box 13.

[0019] In addition, the air that cools and heats the beans is exhausted from the intake port (not shown) of the cooling blower 14 via the fan (not shown) of the cooling blower 14 and from the exhaust port (not shown) of the cooling blower 14. The air is then sent to the exhaust manifold 11 via the second bean cooling pipe 16 (size: φ50mm×800mm), where it mixes with the high-temperature hot air sent from the hot air exhaust pipe 10 of the exhaust manifold 11 and is discharged to the back of the roaster 1.

[0020] In addition, the hot air is usually not directly exhausted to the back side. The outlet side of the exhaust manifold 11 is connected to the exhaust pipe on the shop side, and the hot exhaust air is exhausted to the outside.

[0021] Existing technical documents

[0022] Patent documents

[0023] Patent Document 1: Japanese Patent No. 3637434 Summary of the Invention

[0024] The technical problem that the invention aims to solve

[0025] However, in the actual bean roaster 1 proposed by the latter, because room temperature air is drawn in from above the bean storage box 13, the recrystallization of oils or caffeine released from the roasted beans adheres to the cooling blower 14, causing the fins to stick and not rotate. Therefore, the operator has to regularly carry out the tedious disassembly and cleaning of the cooling blower 14.

[0026] Furthermore, the air blown from the roasting blower 3 passes through various pipes, including the heating device inlet pipe 4, the heating device outlet pipe 6, the housing recovery pipe 7, and the hot air exhaust pipe 10, up to a total length of 3 meters. These pipes are constructed with a complex, winding structure. Therefore, the roasting blower 3 requires a large-capacity three-phase 200V 2kW type to overcome the air resistance losses from these pipes and to effectively agitate the beans. Consequently, the roasting blower 3 becomes large and expensive, and there is also the problem of increased drive noise.

[0027] Furthermore, as mentioned above, since the total length of the pipe between the baking blower 3 and the exhaust manifold 11 reaches 3m and is complexly curved, it is impossible to ensure that there is enough space in front of the baking machine 1 to accommodate the shell recycling bin 17, which needs to be periodically disposed of by the operator. Therefore, the shell recycling bin 17 is located on the right side of the baking machine 1. Here, when disposing of the shell of the shell recycling bin 17, it is necessary to open the side cover (not shown) of the baking machine 1 to remove the shell recycling bin 17. However, in order to perform this removal operation, the right side of the baking machine 1 typically requires a minimum of 430mm of empty space. Therefore, in the case of setting up a large baking machine 1 with product dimensions of 750mm width × 775mm depth × 1340mm height, if the shell recycling operation space is included, a space of 1180mm width × 775mm depth is required, thus posing a problem that it cannot be installed in narrow shops.

[0028] Furthermore, similar to the baking machine disclosed in Patent Document 1, since the shell recycling pipe 7 is connected to the fixed cover 18 of the baking pot 2, not only does the overall height of the baking machine 1 increase, but the fixed cover 18 cannot be easily removed when cleaning the inside of the baking pot 1, which is a problem in daily maintenance. In addition, since the shell recycling pipe 7 is connected to the shell recycling box 17 located at the bottom of the baking machine 1, the path of the shell recycling pipe 7 becomes longer, and the corresponding part is prone to shell accumulation, which is a disadvantageous structure in terms of safety such as fire.

[0029] To address these issues, the present invention aims to provide a compact bean roaster that is low in power consumption, low in noise, highly safe, and inexpensive. This bean roaster features a structure in which hot air is locally ejected from the central bottom of a mortar-shaped roasting pan along the surface of the pan, and the beans are effectively heated while being stirred. This design significantly reduces heat loss and wind resistance loss outside the roasting pan, and is easy for the operator to use and maintain.

[0030] Technical means to solve the problem

[0031] To achieve the above objectives, the invention of technical solution 1 is configured as a bean roaster that sprays hot air from the central bottom of a mortar-shaped roasting pan in a radially inclined direction relative to the roasting pan, stirs and roasts beans. The roaster has a heat source for roasting, namely a heating device, and a roasting blower for supplying high-pressure air to the heating device and supplying the air heated to a high temperature by the heating device into the roasting pan. The heating device is located directly below the central bottom of the roasting pan. The air outlet of the heating device opens upward and is directly connected to the air intake inlet formed at the central bottom of the roasting pan. The air intake inlet of the heating device is located on the side of the heating device and is directly connected to the outlet of the roasting blower.

[0032] According to the invention of technical solution 1, the central bottom of the baking pan is adjacent to the heating device, and the heating device is directly connected to the baking blower. Therefore, the hot air supplied from the baking blower to the heating device and from the heating device to the baking pan flows smoothly with minimal heat loss and wind resistance loss. Thus, the heating device and the baking blower can be miniaturized, thereby reducing power consumption.

[0033] The invention of technical solution 2 is configured to have a shell recovery pipe for allowing exhaust air containing the shell to pass through the baking pan, a cyclone for drawing in exhaust air through the shell recovery pipe and separating the shell from the exhaust air, a shell recovery box for collecting the shell separated by the cyclone, and the upper part of the side wall of the baking pan has an annular edge extending vertically to a predetermined width, the inlet side of the shell recovery pipe is connected to the annular edge, the outlet side of the shell recovery pipe is connected to the upper side of the cyclone, and the shell recovery box is disposed at the lower part of the cyclone and designed to be removed from the front of the baking pan.

[0034] According to the invention of technical solution 2, since the inlet of the shell recycling pipe is not at the top of the baking pan, but connected to the annular edge formed on the side wall of the baking pan, the shell recycling pipe does not protrude above the baking pan, thus reducing the height of the baking machine and achieving miniaturization. Furthermore, since the shell recycling box can be removed from the front of the baking machine, no operating space for the shell recycling box is needed on the side of the baking machine, further improving operability.

[0035] The invention of technical solution 3 is configured to have a bean recycling hole for discharging roasted beans disposed in a portion of an inclined section that slopes downward from the lower end of the annular edge in the side wall of the roasting pot, and has a bean recycling mechanism including a bean recycling door for opening and closing the bean recycling hole, a bean recycling channel communicating with the bean recycling hole and for guiding the roasted beans discharged from the bean recycling hole to outside the roasting pot, a bean cooling box communicating with the outlet of the bean recycling channel and for receiving the roasted beans flowing out of the bean recycling channel, a bean storage box that can be detached and freely stored in the bean cooling box for receiving the roasted beans flowing into the bean cooling box, and a bean cooling fan disposed in the bean cooling box for blowing air into the bean storage box to cool the roasted beans.

[0036] According to the invention of technical solution 3, when the bean recycling door opens the bean recycling hole, the roasted beans in the roasting pan fall through the bean recycling hole and move sequentially through the bean recycling channel, the bean cooling box, and the bean storage box. Then, the roasted beans are stored in the bean storage box and cooled by air blown from the bean cooling fan. Here, since the bean cooling fan is located in the bean cooling box, the air blown from the bean cooling fan can directly act on the beans in the bean storage box and effectively cool the beans, thus enabling miniaturization of the bean cooling fan. Furthermore, since the air blown from the bean cooling fan is directed to the bean storage box, the air from which the beans have been cooled will not flow from the bean storage box into the bean cooling fan, thus reducing dirt accumulation on the bean cooling fan and achieving maintenance-free operation.

[0037] The invention of technical solution 4 is configured to have a bean cooling pipe connected to the exhaust port of the bean cooling box for ventilating the exhaust air of the cooled roasted beans, an exhaust pipe connected to the cyclone for ventilating the exhaust air separated from the shell in the cyclone, and an exhaust collection pipe connecting the outlet side of the supply and exhaust pipe and the outlet side of the bean cooling pipe to collect the exhaust air in the exhaust pipe and the bean cooling pipe and ventilate it outside the roaster.

[0038] According to the invention of technical solution 4, a bean cooling pipe that ventilates the exhaust air of the roasted beans and an exhaust pipe that ventilates the exhaust air in the cyclone are connected to an exhaust manifold. Therefore, not only is the overall roaster compact, but by mixing the high-temperature exhaust air during roasting with the room-temperature exhaust air from the bean cooling fan and exhausting it from one place, the temperature of the exhaust air discharged from the roaster can be reduced, thus providing a roaster with less risk of burns and fires.

[0039] The invention of technical solution 5 has a control unit that controls the bean recycling mechanism so that the bean recycling door closes the bean recycling hole during roasting, opens the bean recycling hole during bean recycling, and closes the bean recycling hole when the temperature inside the roasting pot is lower than a specified temperature during bean cooling.

[0040] According to the invention of technical solution 5, in the initial stage of cooling beans, there is a path for exhausting air from the bean cooling box through the exhaust port and a path for exhausting air from the bean collection hole through the roasting pot and from the exhaust port of the cyclone separator. Exhausting through these two paths reduces wind resistance loss. Therefore, the beans in the bean collection box are agitated by the air from the bean cooling fan, creating a "jumping" motion, and the air is evenly distributed over the beans, thus enabling rapid cooling. Furthermore, when the temperature inside the roasting pot falls below a predetermined temperature, the bean collection hole can be closed to maintain the temperature for continuous roasting of the next batch of beans. Therefore, the continuous roasting time can be shortened, and a roaster capable of roasting large quantities of beans in a short time using various roasting methods can be provided.

[0041] The effects of the invention

[0042] In this invention, the central bottom of the baking pan is adjacent to the heating device, and the heating device is adjacent to the baking blower. Therefore, the hot air supplied from the baking blower to the heating device and from the heating device to the baking pan flows smoothly with minimal heat loss and wind resistance loss. Thus, the heating device and baking blower can be miniaturized, thereby reducing power consumption. Attached Figure Description

[0043] Figure 1 This is a perspective view of the bean roasting machine that relates to the present invention.

[0044] Figure 2 This is a cross-sectional view showing a portion of the main components of the baking machine involved in the present invention.

[0045] Figure 3 This is an enlarged sectional view showing the connection structure between the central bottom of the baking pan and the outlet of the heating device.

[0046] Figure 4 This is an abbreviated cross-sectional perspective view of the bean recycling mechanism, showing the state of the bean recycling gate opening.

[0047] Figure 5 This is an abbreviated cross-sectional perspective view of the soybean recycling mechanism, showing the soybean recycling gate in the closed state.

[0048] Figure 6 This is a 3D structural diagram of the bean cooling box and bean storage box.

[0049] Figure 7 This is a block diagram illustrating the drive control of the bean roaster involved in this invention.

[0050] Figure 8 This describes the drive control process of the baking machine involved in this invention. Figure 1 .

[0051] Figure 9 This describes the drive control process of the baking machine involved in this invention. Figure 2 .

[0052] Figure 10 This is a timing diagram illustrating the drive control of the baking machine involved in the present invention.

[0053] Figure 11 This is a right view of a traditional baking machine.

[0054] Figure 12 This is a right view of the bean cooling machine in a traditional roaster. Detailed Implementation

[0055] Figures 1-10 This is a diagram illustrating one embodiment of the baking machine involved in the present invention.

[0056] like Figures 1-6 As shown, the bean roaster 20 of this embodiment is composed of the following components.

[0057] Specifically, it includes: a roasting pan 23 for roasting coffee beans; a heating device 40 serving as the heat source for the roasting pan 23; a roasting blower 37 for introducing high-pressure air into the heating device 40 and introducing air heated to a high temperature by the heating device 40 into the roasting pan 23; a shell recovery pipe 28 for allowing exhaust air containing the shell inside the roasting pan 23 to pass through; a cyclone separator 42 for drawing in exhaust air through the shell recovery pipe 28 and separating the shell from the exhaust air; a shell recovery box 44 for collecting the shell separated by the cyclone separator 42; a bean recovery mechanism 48 including a bean recovery door 49 for opening and closing the bean recovery hole 23h of the roasting pan 23; a bean recovery channel 47 connected to the bean recovery hole 23h and for guiding the roasted beans discharged from the bean recovery hole 23h to outside the roasting pan 23; and an outlet 47 connected to the bean recovery channel 47. b) A bean cooling box 51 for receiving roasted beans flowing out of bean recycling channel 47; a bean storage box 52 for receiving roasted beans flowing into bean cooling box 51 and being disassembled and stored in bean cooling box 51; a bean cooling fan 53 installed in bean cooling box 51 and blowing air into bean storage box 52 to cool roasted beans; a bean cooling pipe 54 connected to exhaust port 51c of bean cooling box 51 for ventilating exhaust air that has cooled roasted beans; an exhaust pipe 43 connected to cyclone separator 42 for ventilating exhaust air separated from the shell in cyclone separator; and an exhaust manifold 45 for connecting the outlet side of exhaust pipe 43 and the outlet side of bean cooling pipe 54, collecting exhaust air in exhaust pipe 43 and bean cooling pipe 54 and ventilating outside roaster 20.

[0058] The following will refer to Figures 1-10 The structure of the baking machine 20 according to the embodiment will be described in detail.

[0059] like Figures 1-3 As shown, the side wall 23e of the baking pan 23 is formed in the shape of a mortar. The side wall 23e consists of an annular edge 23f located at the upper part of its side wall and extending vertically to a predetermined width, and an inclined portion 23g extending downward from the lower end of the annular edge 23f. In addition, a heat-insulating member 23j is provided on the outer side of the side wall 23e.

[0060] Additionally, a heating element 40, serving as a heat source, is positioned directly below the center bottom of the baking pan 23, and a baking blower 37 for supplying high-pressure air into the heating element 40 is positioned behind it. Furthermore, an intake filter 38 is installed on the air inlet side of the baking blower 37 to ensure that clean air is always supplied to the heating element 40.

[0061] In addition, such as Figure 1 and Figure 2As shown, a baking pan lid 32, insulated by a heat-insulating component 32b, is provided at the upper opening of the baking pan 23. This baking pan lid 32 is freely supported by a lid hinge 34 and a lid latch 35, and the baking pan 23 is airtightly closed via a pan filler 30. A hopper 33 for receiving green beans is disposed on the upper part of the baking pan lid 32, and the green beans are transferred into the baking pan 23 by pressing the hopper lever 33a.

[0062] Here, the baking pan 23 requires regular cleaning and maintenance. In this case, by unlocking the lid latch 35 and holding the baking pan handle 32a by hand and rotating it, the lid hinge 34 can fix the baking pan lid 32 at any opening angle, thus making it easy to clean and maintain the inside of the baking pan 23.

[0063] In addition, such as Figure 1 and Figure 2 As shown, a shell recovery pipe 28 is connected to the right side of the baking pan 23, and the outlet side of the shell recovery pipe 28 is connected to the upper part of the cylinder of the cyclone separator 42. The upper part of the cyclone separator 42 is connected to the exhaust manifold 45 via the exhaust pipe 43. On the other hand, a shell recovery box 44 is disposed on the lower part of the cyclone separator 42 via the housing mounting plate 46. The shell recovery box 44 can be freely installed and removed from the front of the baking machine 20.

[0064] In addition, such as Figure 1 and Figure 2 As shown, the inclined portion 23g of the roasting pan 23 is connected to a bean collection channel 47, and a bean collection mechanism 48 with a bean collection door 49 is provided in the bean collection channel 47. In addition, a bean cooling box 51 is arranged below the bean collection channel 47. The front opening of the bean cooling box 51 is closed by a removable bean storage box 52. On the other hand, an exhaust port 51c connected to a bean cooling pipe 54 is located on the upper left side of the front of the bean cooling box 51. The exhaust air after cooling the beans is guided through the bean cooling pipe 54 to the exhaust manifold 45 at the rear of the roaster.

[0065] like Figure 2 As shown, the baking blower 37 is arranged adjacent to the upper side of the heating device 40 and opposite to it. The outlet 37a of the baking blower 37 is directly connected to the inlet 40a of the heating device 40, and is also airtightly connected via the heating device inlet packing 39 of the elastic sealing member.

[0066] like Figure 2 and Figure 3As shown, the air outlet 40b of the heating device 40 is also airtightly connected to the air intake 23a of the baking pan 23 via a metal collar 25. Here, both the outlet 40b and the inlet 23a are metal tubes, not flexible tubes, and are arranged linearly. Therefore, the air blown from the baking blower 37... Figure 2 As shown by the dashed arrow, it is fed into the heating device 40, the outlet 40b of the heating device 40, the inlet of the baking pan 23, and the inside of the baking pan 23.

[0067] In conventional roasting machines, the flexible tube positioned between the outlet of the heating device and the inlet of the roasting pot is U-shaped and employs a trapping structure to prevent the intrusion of soybean residue, foreign matter, and water from above. In contrast, the roasting machine 20 of this embodiment does not use a flexible tube; instead, it uses a metal tube to linearly arrange the outlet 40b and inlet 23a, thus minimizing heat loss and air resistance loss.

[0068] On the other hand, such as Figure 3 As shown, instead of a traditional trap structure, a metal mesh 26 is provided at the upper end 23b of the inlet 23a. Here, the mesh opening size of the metal mesh 26 is 1.52 mm, thus preventing soybean residue or foreign objects from falling directly into the heating device 40 from above. Furthermore, the upper end 23b of the baking pot 23 and the lowermost small hole 23c in the space outside it prevent water from entering the pot from entering the heating device 40, thus ensuring safety under actual operating conditions while suppressing heat loss and wind resistance loss.

[0069] Additionally, a fin 24 is screwed to the lower center of the roasting pan above the metal mesh 26 to agitate the beans by spraying hot air compressed into the roasting pan 23 in a radially inclined direction relative to the roasting pan 23. Furthermore, the outside of the roasting pan 23 is covered by an insulation component 23j, and an insulation material cover 22 is disposed on the outside of the insulation component 23j to suppress heat dissipation from the roasting pan 23, thereby reducing heat loss.

[0070] A square hole 23d is opened on a portion of the annular rim 23f of the roasting pot 23. Through this square hole 23d, a U-shaped shell recovery channel 27 protrudes into the center of the roasting pot 23. Furthermore, the bottom of the roasting pot lid 32 is designed to maintain a certain distance from the upper opening of the shell recovery channel 27 inside the roasting pot 23, and this gap prevents beans from entering the shell recovery channel 27.

[0071] Furthermore, the outlet side of the shell recovery channel 27 is connected to the upper side of the cyclone separator 42 via a box-shaped shell recovery pipe 28. Therefore, the shell recovery pipe 28 is connected to the baking pan 23 via the shell recovery channel 27.

[0072] In addition, a temperature sensor 36 is disposed on the inlet side of the housing recovery pipe 28. The air temperature detected by the temperature sensor 36 is used as a substitute characteristic of the air temperature inside the baking pan 23, utilizing the temperature profile during baking and other operational controls.

[0073] The upper part of the cyclone separator 42 is connected to the exhaust manifold 45 via the exhaust pipe 43, and the shell recovery box 44 is detachably and freely disposed on the lower part of the cyclone separator 42 via the housing mounting plate 46. In addition, the shell recovery box 44 is configured so as to be removed from the front of the baking machine 20.

[0074] Here, since the shell recovery pipe 28 is a rectangle with a cross-section of 40mm × 90mm and a length of approximately 400mm, and the exhaust pipe 43 has dimensions of φ75mm × 600mm, the total length of the pipes is 1000mm, equivalent to one-third the length of a traditional roaster. This significantly reduces wind resistance loss compared to traditional roasters. Therefore, the roasting blower 37 can operate at a small capacity (single-phase 200V, 800W) to stir and roast beans, thus achieving miniaturization, cost reduction, and low noise in the roaster 20.

[0075] Furthermore, since the outlet 40b of the heating device 40 is directly connected to the inlet 23a of the baking pan 23, hot air heated to over 280°C in the heating device 40 can be delivered into the baking pan 23 with almost no heat loss even without the use of insulation materials. Moreover, since the heating device 40 is sufficient with a single-phase 200V·8kW capacity, a small and inexpensive heating device 40 can be used.

[0076] like Figure 4 and Figure 5 As shown, a bean collection hole 23h is formed in a portion of the inclined section 23g of the roasting pan 23. It should be noted that... Figure 4 and Figure 5 The inclined section 23g and the bean recycling hole 23h are shown in planar view, and the operation of the bean recycling gate 49 for these components is shown.

[0077] The bean recycling hole 23h opens obliquely into a square shape along the inclined portion 23g and is opened and closed by the bean recycling door 49. Furthermore, the bean recycling door 49 is moved up and down by the drive control of the bean recycling mechanism 48, which includes a bean recycling door motor 48a, thereby opening and closing the bean recycling hole 23h. That is, as... Figure 4 As shown, when the bean recycling gate motor 48a is driven to move the bean recycling gate 49 upward, the bean recycling hole 23h will open, as... Figure 5 As shown, when the bean collection door 49 moves downward, the bean collection hole 23h will close. In addition, a bean collection guide plate 29 is arranged near the bean collection door 49 on the annular edge 23f to guide the beans in the roasting pot 23 to the bean collection hole 23h.

[0078] like Figure 1 , Figure 2 and Figure 6 As shown, the bean recycling hole 23h is connected to the bean cooling box 51 containing the bean storage box 52 via the bean recycling channel 47.

[0079] like Figure 6 As shown, the bean storage box 52 has a box-shaped body 52a with an opening at the top and a 10mm wide outer frame on all four sides at the bottom with an opening in the center. A perforated metal plate component 56 is disposed on the bottom side of the body 52a and the beans are stored on the top side of the perforated metal plate component 56. The beans are cooled by airflow from the bottom side of the perforated metal plate component 56.

[0080] Furthermore, since the perforated metal plate component 56 is configured such that its end face is bent downwards by 5 mm, placing it 5 mm above the surface of the outer frame width 10 mm, the cooling air from below the perforated metal plate component 56 will also be blown evenly onto the bean located at the top of the outer frame width 10 mm.

[0081] In addition, the part corresponding to the outer frame (10 mm wide) of the bean storage box 52 in the bean cooling box 51 is also a sealing face 51a. Therefore, the outer frame (10 mm wide) on all four sides is retained in the same way as the bean storage box 52, and the center is opened. Thus, the airtightness is maintained by the sealing face 51a, and the air from the bean cooling fan 53 can only pass through the opening.

[0082] The front panel 52b of the bean storage box 52 is sized to cover the opening of the bean cooling box 51 and the surrounding sealing surface 51b. It is made of magnetic material so that it is tightly attached to the sealing surface 51b by the attraction of the magnet 57 installed on the back of the sealing surface 51b. The front panel 52b is provided with a handle 52c for the operator to hold when disassembling the bean storage box 52.

[0083] It should be noted that the attractive force of the magnet 57 is designed to be such that it will not become a significant load when the operator pulls out the bean storage box 52 by hand. Furthermore, when the bean storage box 52 is assembled into the bean cooling box 51 and the beans are being cooled, the attractive force of the magnet 57 is set so that it will not be opened naturally by the air pressure of the bean cooling fan 53. In the roaster 20 of this embodiment, four magnets 57 are used, and the total attractive force is designed to be approximately 14N.

[0084] like Figure 2 As shown, the upper part of the bean cooling box 51 is connected to the lower end of the bean recycling channel 47, guiding the roasted beans that fall from the bean recycling channel 47 into the bean storage box 52. It should be noted that, since the bean cooling box 51 is airtightly connected to the bean recycling channel 47, a recycling channel filler 50 is provided.

[0085] Additionally, the upper part of the bean cooling box 51 has an outlet 51c for discharging air blown from the bean cooling fan 53. Furthermore, the outlet 51c is connected to a bean cooling pipe 54 that is connected to the exhaust manifold 45. Therefore, the air blown into the bean cooling box 51 is discharged to the exhaust manifold 45 through the outlet 51c and the bean cooling pipe 54.

[0086] A bean cooling fan 53 is installed below the bean cooling box 51. The air blown by the bean cooling fan 53, such as... Figure 2 As shown by the single-dot dashed arrow, after the beans in the bean cooling filter 55 pass through the holes of the perforated metal plate component 56 of the bean storage box 52 and are cooled, air is sent to the exhaust manifold 45 through the bean cooling pipe 54.

[0087] In order to effectively cool the roasted beans in the bean storage box 52 by the airflow of the bean cooling fan 53, the outer frame formed on the lower part of the bean storage box 52 and the sealing surface 51a of the corresponding bean cooling box 51 need to be in airtight contact, and the front plate 52b of the bean storage box 52 and the sealing surface 51b of the opening of the bean cooling box 51 need to be in airtight contact. The flatness between these parts is controlled to a size that can ensure airtightness.

[0088] Next, we will refer to Figure 7 Control block diagram, Figure 8 process Figure 1 , Figure 9 process Figure 2 and Figure 10 The timing diagram illustrates the operation control of the baking machine 20.

[0089] like Figure 7 As shown, the baking machine 20 is operated and controlled by a control unit consisting of a microcomputer 60, and therefore has a CPU 60a for controlling each machine, a memory 60b for storing set temperatures and the like, and a timer 60c for measuring the running time of each machine and the like.

[0090] The microcomputer 60 is connected to a preheating switch 61 for indicating that the baking pan 23 is preheated for baking, a baking switch 62 for indicating the start of baking after preheating, a temperature sensor 36 for detecting the temperature inside the baking pan 23, and a bean box sensor 63 for detecting whether the bean storage box 52 is stored in the bean cooling box 51.

[0091] Here, the bean box sensor 63 consists of a sensor magnet (not shown) disposed on the lower back of the bean storage box 52 and a reed switch (not shown) disposed opposite to the magnet 57 of the bean cooling box 51. It is configured such that when the bean storage box 52 is installed in the correct position, the reed switch contacts are closed (ON), and when the bean storage box 52 is pulled out 2 mm from this position, the contacts are open (OFF). Therefore, in the event that the bean storage box 52 is not correctly positioned, safety is ensured so that roasting does not begin (and also so that beans being roasted are not discharged outside the roasting pan 23).

[0092] The output side of the microcomputer 60 is connected to a heating device 40, a roasting blower 37, a bean cooling fan 53, and a bean recycling gate motor 48a.

[0093] Therefore, each machine is controlled based on each switch 61, 62 and each sensor 36, 63.

[0094] exist Figure 10 In the timing diagram, the solid line represents the temperature detected by the temperature sensor 36, and the dashed line represents the air temperature about 10 mm above the center of the perforated metal plate component 56 inside the bean storage box 52.

[0095] In addition, the operating status of the bean cooling fan 53 is 0V indicating that it is stopped and 24V indicating that it is running. The operating status of the roasting blower 37 is 0V indicating that it is stopped. The other numbers from 2V to 2.5V indicate that it is running. The larger the value, the higher the speed of the roasting blower 37 and the greater the corresponding air volume.

[0096] also, Figure 10 This indicates the standard temperature and time for roasting 200g of green coffee beans using the roaster of this invention in a dark roast, medium speed mode. However, the roasting degree of the beans can be set to eight stages from light roast to dark roast, and the roasting time can be set to three stages: low speed, medium speed, and high speed.

[0097] The following will refer to Figures 8-10 The operation of the baking machine 20 will be explained.

[0098] When the roaster 20 is powered on, it continuously monitors whether the bean storage box 52 is stored in the bean cooling box 51 based on the detection signal from the bean box sensor 63 (S1). During roasting, 200g of green coffee beans are added to the upper hopper 33 and the preheating switch 61 of the roaster 20 is pressed (S2). Therefore, preheating of the roaster 20 begins. Additionally, the heating device 40 is powered on, and the bean cooling fan 53 is supplied with 24V, while the roasting blower is supplied with 2.5V. Figure 10(1) Then, the temperature inside the baking pan 23 rises, and when the temperature sensor 36 detects 160°C ( Figure 10 (2) Subsequently, the heating device 40 repeatedly switches on and off between 150°C and 160°C to control the temperature inside the roasting pot 23 to keep it constant (S3). Normally, preheating ends within 5 minutes. In addition, the bean recycling door 49 is set to always keep the bean recycling hole 23h closed during roasting standby.

[0099] Next, for example, after 5 minutes, press the hopper lever 33a to put the green beans into the roasting pot 23, and press the roasting switch 62 (S4) of the roaster 20. Figure 10 (3) At the beginning of the roasting process, the temperature inside the roasting pot 23 temporarily drops due to the addition of beans. However, the heating device 40 is switched on and off to maintain the temperature detected by the sensor at 150°C according to the preset roasting temperature curve of the beans, and the temperature inside the roasting pot 23 is maintained at 150°C for a specified time T1 (S5, S6). Figure 10 (4) Therefore, the moisture in the beans inside the roasting pan 23 is blown away (bean moisture blowing process).

[0100] When the moisture removal process of the beans is completed, the heating device 40 is controlled to gradually increase the temperature inside the roasting pan 23 (S7). Figure 10 (5) Continue the roasting process of the beans. Therefore, the beans in roasting pot 23 are roasted.

[0101] In this roasting process, shells separated from the coffee beans are produced in the roasting pan 23. These shells, along with hot air, pass through the shell recovery channel 27 and shell recovery pipe 28, and enter the cyclone separator 42 from its upper side. Inside the cyclone separator 42, the hot air swirls like a vortex, and the shells fall under their own weight into the shell recovery box 44 below. Meanwhile, the hot air separated from the shells in the cyclone separator 42 is sent to the exhaust manifold 45 through the exhaust pipe 43 at the top of the cyclone separator 42, and is exhausted outside the roaster 20. It should be noted that... Figure 2 The double-dotted arrow shown indicates the airflow from the baking pan 23 to the outside of the baking machine 20, where hot air is expelled.

[0102] In the roasting process of this bean, the roasting process ends when the temperature inside the roasting pan 23 reaches the roasting end temperature of 230℃ (S8). Figure 10 (S6) Upon completion of the roasting process, the power supply to the heating device 40 is stopped (S9). In addition, the bean recycling door 49 is opened by driving the bean recycling door motor 48a, so that the bean recycling hole 23h is opened (S10). Furthermore, the voltage of the roasting blower 37 is changed to 2V for driving (S11), thereby starting the bean recycling process.

[0103] In this bean recycling process, the beans in the roasting pot 23 rotate in a circular direction under the air blowing action of the roasting blower 37. They are guided to the vicinity of the center of the bean recycling channel 47 by the bean recycling guide plate 29, and fall from the outlet 47b below the bean recycling channel 47. They are then collected in the bean storage box 52 by the bean cooling box 51.

[0104] Furthermore, in the bean recycling process, the output of the roasting blower 37 is reduced from 2.5V to 2V because the bean recycling door 49 opens the bean recycling hole 23h, creating two airflow paths for the roasting blower 37. This reduces ventilation resistance, so even with the same voltage, the airflow inside the roasting pan 23 increases. Consequently, the beans inside the roasting pan 23 move around more erratically, increasing the bean recycling time, thus reducing the output of the roasting blower 37.

[0105] In addition, during the bean recycling process, both the roasting blower 37 and the bean cooling fan 53 are operated. However, since the air volume and air force of the roasting blower 37 are overwhelmingly greater than those of the bean cooling fan 53, the operation of the bean cooling fan 53 will not hinder the bean recycling operation.

[0106] As described above, after the roasting blower 37 operates continuously at 2V output for a predetermined time T2 (S12), the output of the roasting blower 37 is changed to 2.3V and operated until a predetermined time T3 has elapsed since the start of the bean recycling process (S13, S14). With the roasting blower 37 operating at 2V, most of the beans in the roasting pan 23 are recycled to the bean storage box 52, but some beans may adhere to the inclined portion 23g of the roasting pan 23. Therefore, the output of the roasting blower 37 is set to 2.3V, and the adhering beans are removed by airflow and recycled to the bean storage box 52.

[0107] Through this bean recycling process, the roasted beans are stored in bean storage box 52, and the temperature inside bean storage box 52 rises to approximately 150°C. Figure 10 (7) However, the air blown from the bean cooling fan 53 flows evenly into the bean storage box 52 through the perforated metal plate component 56, so that the roasted beans in the bean storage box 52 are piled up almost evenly.

[0108] It should be noted that the bean recycling process ends in about 20 seconds (T3). At the end of the bean recycling process, the output of the roasting blower 37 is set to 0V (S15), the operation of the blower 37 is stopped, and the process is transferred to the bean cooling process.

[0109] Furthermore, since the bean cooling process continues with the bean recovery hole 23h open, the air supplied by the bean cooling fan 53 is delivered through the bean cooling pipe 54 → exhaust manifold 45, and then into the roasting pan 23 → shell recovery pipe 28 → cyclone separator 42 → exhaust pipe 43 → exhaust manifold 45. Therefore, due to the reduced ventilation resistance, the bean temperature decreases more rapidly compared to cooling the beans with the bean recovery hole 23h closed.

[0110] That is, by setting the bean cooling channel as a two-system, the ventilation resistance of the wind from the bean cooling fan 53 is reduced, and the beans piled in the bean storage box 52 are cooled in a jumping state, so the wind passes evenly through the outer surface of the beans, thus improving the cooling performance of the beans.

[0111] Then, when the temperature inside the roasting pan 23 reaches the specified temperature (e.g., 160°C) (S16), the bean collection door 49 is closed (S17). That is, in order to allow the next roasting process to proceed quickly (for continuous roasting), the temperature inside the roasting pan 23 needs to be maintained between 150°C and 160°C. Therefore, at the point when the temperature of the roasting pan 23 reaches the specified temperature (160°C) ( Figure 10 (S17) Close the bean recycling door 49. Therefore, the temperature inside the roasting pan 23 will not drop below 150°C due to the insulation effect. Therefore, since the next roasting can be carried out without preheating, it is possible to simultaneously shorten the bean cooling time and the time required until the next roasting.

[0112] When the bean cooling process has elapsed for a predetermined time T4 (e.g., 2 minutes from the start of the bean recycling process), the bean cooling fan 53 is stopped, and the bean cooling process ends (S18, S19). That is, if it is 200g of green coffee beans, 2 minutes after the start of bean recycling, the roasted beans are cooled to a temperature 2°C higher than the outside temperature. Therefore, 2 minutes after the start of the bean recycling operation, the voltage of the bean cooling fan 53 is reduced to 0V, the bean cooling fan 53 is stopped, and the cooling process ends is displayed on the screen (not shown). In addition, a buzzer (not shown) is sounded to indicate that the bean storage box 52 can be removed. Figure 10 (9 in the middle).

[0113] Then, the operator removes the bean storage box 52, transfers the beans to other containers, and reassembles the bean storage box 52 into the bean cooling box 51. After pressing the roasting switch 62, as follows... Figure 8 process Figure 1 As shown, the process can be restarted from step S4, allowing for continuous baking operations. Figure 10 10 in the middle).

[0114] In the roaster 20 of this embodiment, after the beans are recovered, cooling is performed with the bean recovery door 49 open until the temperature inside the roasting pan 23 reaches a predetermined temperature (threshold). The background for shortening the cooling time and the time required to reach a roastable state is that recently, bean buyers have a wide range of tastes and an increasing demand for the variety of bean types and roasting methods. Therefore, compared with the traditional roasting of more beans in one roasting, the roaster needs to be able to roast about 200g of green beans in a shorter time with more roasting methods to better meet the needs of each bean buyer.

[0115] In addition, in the roaster 20 of this embodiment, the reason for continuously operating the bean cooling fan 53 at 24V from the preheating stage is to prevent the temperature inside the bean storage box 52 from rising due to the radiant heat and heat conduction of the roasting pan 23, and, as described above, to minimize the temperature of the air exhausted from the exhaust manifold 45 to the outside of the roaster 20.

[0116] Since the baking machine 20 of this embodiment has the above-described structure, it performs the following functions and effects.

[0117] That is, a bean roaster 20 that sprays hot air from the central bottom of a mortar-shaped roasting pan 23 at a radial angle relative to the roasting pan 23 to stir and roast beans is configured to have a heat source for roasting, namely a heating device 40, and a roasting blower 37 for supplying high-pressure air to the heating device 40 and heating the air to a high temperature by the heating device 40 into the roasting pan 23. The heating device 40 is located directly below the central bottom of the roasting pan 23. The air outlet 40b of the heating device 40 opens upward and is directly connected to the air intake 23a formed in the central bottom of the roasting pan 23. The air intake 40a of the heating device 40 is located on the side of the heating device 40 and is directly connected to the outlet 37a of the roasting blower 37.

[0118] Therefore, the central bottom of the baking pan 23 is adjacent to the heating device 40, and the heating device 40 is directly connected to the baking pan 23. Thus, the hot air supplied from the baking blower 37 to the heating device 40 and from the heating device 40 to the baking pan 23 flows smoothly, resulting in minimal heat loss and air resistance loss. Therefore, the heating device and the baking blower can be miniaturized, thereby reducing power consumption.

[0119] Furthermore, the baking machine 20 of this embodiment is configured to have a shell recovery pipe 28 for passing exhaust air through the shell containing the shell inside the baking pan 23, a cyclone separator 42 for drawing in exhaust air through the shell recovery pipe 28 and separating the shell from the exhaust air, and a shell recovery box 44 for collecting the shell separated by the cyclone separator 42. The upper part of the side wall 23e of the baking pan 23 has an annular edge 23f extending vertically to a predetermined width. The inlet side of the shell recovery pipe 28 is connected to the annular edge 23f, the outlet side of the shell recovery pipe 28 is connected to the upper side of the cyclone separator 42, and the shell recovery box 44 is disposed at the lower part of the cyclone separator 42 and designed to be removable from the front of the baking machine 20.

[0120] Therefore, since the inlet side of the shell recovery pipe 28 is not on the top of the baking pan 23, but connected to the annular edge 23f formed on the side wall 23e of the baking pan 23, the shell recovery pipe 28 does not protrude above the baking pan 23, thus reducing the height of the baking machine 20 and achieving miniaturization. Furthermore, since the shell recovery box 44 can be removed from the front of the baking machine 20, no operating space for the shell recovery box 44 is needed on the side of the baking machine 20, further improving operability.

[0121] Furthermore, the roaster 20 of this embodiment is configured such that a bean collection hole 23h for discharging roasted beans is provided in a portion of an inclined portion 23g that slopes downward from the lower end of the annular edge 23f in the side wall 23e of the roasting pot 23, and has a bean collection mechanism 48 including a bean collection door 49 for opening and closing the bean collection hole 23h, a bean collection channel 47 connected to the bean collection hole 23h and used to guide the roasted beans discharged from the bean collection hole 23h to outside the roasting pot 23, a bean cooling box 51 connected to the outlet 47b of the bean collection channel 47 and used to contain the roasted beans flowing out of the bean collection channel 47, a bean storage box 52 that is detachably stored in the bean cooling box 51 and used to store the roasted beans flowing into the bean cooling box 51, and a bean cooling fan 53 provided in the bean cooling box 51 and blows air into the bean storage box 52 to cool the roasted beans.

[0122] Therefore, when the bean collection door 49 opens the bean collection hole 23h, the roasted beans in the roasting pan 23 fall through the bean collection hole 23h and move sequentially through the bean collection channel 47, the bean cooling box 51, and the bean storage box 52. Then, the beans stored in the bean storage box 52 are cooled by air blown out by the bean cooling fan 53. Here, since the bean cooling fan 53 is located in the bean cooling box 51, the air blown out by the bean cooling fan can directly act on the beans in the bean storage box 52 and effectively cool the beans, thus enabling the miniaturization of the bean cooling fan 53. Furthermore, since the air blown out by the bean cooling fan 53 is directed to the bean storage box 52, the air from which the beans have been cooled does not flow from the bean storage box 52 into the bean cooling fan 53, thus reducing dirt accumulation on the bean cooling fan 53 and achieving maintenance-free operation of the bean cooling fan 53.

[0123] To explain the function and effect in detail, by adopting this structure, the bean cooling fan 53 not only meets the performance of a general square fan, such as DC24V, 12W, but also blows the cooling air from the bean cooling fan 53 onto the beans to cool them. Therefore, smoke or grease produced from the beans will not adhere to the bean cooling fan 53 at all. Thus, the problems of traditional suction methods, namely, the problem that grease released from the beans will adhere to the bean cooling fan 53 after prolonged use, and the problem that caffeine in the smoke will recrystallize, are solved. The fan will not be unable to rotate due to adhesion to the housing. Therefore, for the operator, there is no need for troublesome periodic disassembly and cleaning of the bean cooling fan 53.

[0124] In addition, the roaster 20 of this embodiment is configured to have a bean cooling pipe 54 connected to the exhaust port 51c of the bean cooling box 51 for ventilating the exhaust air of the cooled roasted beans, an exhaust pipe 43 connected to the cyclone 42 for ventilating the exhaust air separated from the shell in the cyclone 42, and an exhaust manifold 45 that connects the outlet side of the exhaust pipe 43 and the outlet side of the bean cooling pipe 54 and collects the exhaust air in the exhaust pipe 43 and the bean cooling pipe 54 and ventilates it to the outside of the roaster 20.

[0125] Therefore, by connecting the bean cooling pipe 54, which ventilates the exhaust air from the cooled roasted beans, and the exhaust pipe 43, which ventilates the exhaust air from the cyclone 42, to an exhaust manifold 45, not only is the overall roaster 20 compacted, but by mixing the high-temperature exhaust air from roasting with the room-temperature exhaust air from the bean cooling fan 53 and exhausting it from one place, the temperature of the exhaust air discharged from the roaster 20 can be reduced, thus providing a roaster 20 with less risk of burns and fires.

[0126] In addition, the roasting machine 20 of this embodiment has a microcomputer 60 (control unit) that controls the bean recycling mechanism 48 so that the bean recycling door 49 closes the bean recycling hole 23h during roasting, opens the bean recycling hole 23h during bean recycling, and closes the bean recycling hole 23h when the temperature inside the roasting pot 23 is lower than the specified temperature when the beans are cooled.

[0127] Therefore, in the initial stage of cooling the beans, there is a path for exhausting air from the bean cooling box 51 through the exhaust port 51c and another path for exhausting air from the bean collection hole 23h through the roasting pot 23 to the outlet side of the cyclone 42. Exhausting through these two paths reduces wind resistance loss. As a result, the beans in the bean collection box 52 are agitated by the air from the bean cooling fan 53, causing them to bounce, and the air is evenly blown onto the beans, thus enabling the beans to be cooled in a short time. In addition, when the temperature inside the roasting pot 23 is lower than the specified temperature, the bean collection hole 23h can be closed to maintain the temperature for roasting the next batch of beans continuously. Therefore, the continuous roasting time can be shortened, and a roaster 20 can be provided that can roast a large number of beans in a short time with various roasting methods.

[0128] Explanation of reference numerals in the attached figures

[0129] 20: Roasting machine; 23: Roasting pot; 23a: Roasting pot inlet; 23e: Roasting pot side wall; 23f: Annular rim; 23g: Inclined section; 23h: Bean recycling hole; 28: Shell recycling pipe; 29: Bean recycling guide plate; 37: Roasting blower; 37a: Roasting blower outlet; 40: Heating device; 40a: Heating device inlet; 40b: Heating device outlet; 42: Cyclone separator; 43: Exhaust pipe; 44: Shell recycling box; 45: Exhaust manifold; 47: Bean recycling channel; 48: Bean recycling mechanism; 49: Bean recycling door; 51: Bean cooling box; 51c: Bean cooling box exhaust port; 52: Bean storage box; 53: Bean cooling fan; 54: Bean cooling pipe; 60: Microcomputer.

Claims

1. A bean roasting machine, wherein hot air is ejected from the central bottom of a mortar-shaped roasting pan at a radially inclined direction relative to the roasting pan to stir and roast the beans, characterized in that, The bean roasting machine has the following features: Heating device, used as a heat source for baking; and A baking blower is used to supply high-pressure air to the heating device and to supply the air heated to a high temperature by the heating device into the baking pan. The heating device is positioned directly below the central bottom of the baking pan. The air outlet of the heating device opens upward and is directly connected to the first air intake formed in the central bottom of the baking pan. The second air intake of the heating device is located on the side of the heating device and is directly connected to the outlet of the baking blower. A metal mesh for preventing soybean residue and foreign objects from falling directly from the central bottom of the baking pan into the heating device is provided at the upper end of the first air intake formed at the central bottom, and a small hole for preventing water from entering the baking pan into the heating device is provided at the bottom of the space provided on the outer side of the upper end.

2. The bean roasting machine according to claim 1, characterized in that, The bean roasting machine has the following features: Shell recovery pipe for allowing exhaust air containing bean shells to pass through the roasting pan; A cyclone separator is used to draw in exhaust air through the housing and separate the bean shells from the exhaust air. as well as Shell recovery bin, used to collect the shells of beans separated by the cyclone separator; The upper part of the side wall of the baking pan has an annular edge extending vertically to a specified width; the inlet side of the shell recovery pipe is connected to the annular edge, and the outlet side of the shell recovery pipe is connected to the upper side of the cyclone separator. The shell recovery box is located at the bottom of the cyclone and is designed to be removed from the front of the baking machine.

3. The bean roasting machine according to claim 2, characterized in that, A bean collection hole for discharging roasted beans is provided in a portion of an inclined section that slopes downward from the lower end of the annular edge in the side wall of the roasting pot. The bean roasting machine has the following features: A bean recycling mechanism, comprising a bean recycling door for opening and closing the bean recycling hole; A bean recycling channel, connected to the bean recycling hole, is used to guide roasted beans discharged from the bean recycling hole to the outside of the roasting pot; A bean cooling box, connected to the outlet of the bean recycling channel, is used to hold roasted beans flowing out of the bean recycling channel; The bean storage box can be disassembled and stored inside the bean cooling box, and is used to store roasted beans that flow into the bean cooling box; as well as A bean cooling fan is installed in the bean cooling box and is used to blow air into the bean storage box to cool the roasted beans.

4. The bean roasting machine according to claim 3, characterized in that, The bean roasting machine has the following features: A bean cooling pipe is connected to the exhaust port of the bean cooling box and is used to ventilate the exhaust air that has cooled the roasted beans. An exhaust duct, connected to the cyclone separator and used to ventilate the exhaust air within the cyclone separator after the bean shells have been separated; and An exhaust manifold connects the outlet side of the exhaust pipe and the outlet side of the bean cooling pipe, collecting the exhaust air from the exhaust pipe and the bean cooling pipe and ventilating it outside the roaster.

5. The bean roasting machine according to claim 3 or 4, characterized in that, The bean roaster has a control unit that controls the bean recycling mechanism so that the bean recycling door closes the bean recycling hole during roasting, opens the bean recycling hole during bean recycling, and closes the bean recycling hole when the temperature inside the roasting pot is lower than a specified temperature during bean cooling.

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