Double-heating baking device for improving flavor of coffee beans

Abstract

The invention relates to the technical field of coffee baking, and particularly discloses a double-heating baking device for improving flavor of coffee beans, which comprises a shell, a main mounting cavity, a lower mounting cavity and a rear mounting cavity are arranged in the shell, a baking cylinder is rotatably mounted in the side wall, close to the rear mounting cavity, of the main mounting cavity, and a first heater is arranged on the lower side of the baking cylinder; an inner heating mechanism is arranged in the baking cylinder; a reverse driving mechanism is arranged in the rear mounting cavity, and the baking cylinder and the inner heating mechanism are driven by the reverse driving mechanism to work reversely; a feeding hopper and a discharging baffle are arranged on the side portion of the shell, a supporting frame is arranged on the lower side of the discharging baffle, and a discharging hopper and a stirrer are installed on the supporting frame. The whole temperature of the baking cylinder is stable, the heating uniformity of coffee beans is improved, local over-scorching or immature cooking is avoided, the coffee beans are in uniform contact with hot air, water vapor and peculiar smell are discharged in time, the baking period is shortened, and the baking efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of coffee roasting technology, and more specifically to a dual-heat roasting apparatus for enhancing the flavor of coffee beans. Background Technology

[0002] Coffee is a popular beverage, loved by many for its stimulating effect and unique aroma. As mentioned above, coffee is a beverage brewed from roasted and ground coffee beans. Roasting involves using a coffee roaster to ripen the beans before grinding. Different varieties and origins of coffee beans require different roasting times and temperatures, resulting in different flavors in the brewed coffee.

[0003] Patent CN112006300A discloses a coffee bean roaster, including a body, a roasting cylinder, a heating device, and an exhaust fan. The body includes a casing, a partition assembly, a material receiving trough, and a tray. The partition assembly is disposed inside the casing to separate a first chamber, a second chamber, and a third chamber. The material receiving trough is located on one side of the casing and communicates with the first chamber. The tray is disposed in the material receiving trough and has multiple sieve holes, which communicate with the material receiving trough. The roasting cylinder is rotatably disposed in the second chamber of the casing, and has multiple through holes on one side communicating with the third chamber. The heating device is disposed in the second chamber of the casing for heating the roasting cylinder. The exhaust fan is integrated with the casing to draw air from inside the casing through the first and third chambers to the outside.

[0004] However, heating the outside of the roasting cylinder with only a single heating device results in uneven heating of the coffee beans, which can easily lead to localized over-burning or under-roasting, affecting the consistency of flavor. During the roasting process, the coffee beans only rotate in one direction with the roasting cylinder, which has limited turning effect. Some coffee beans are in contact with the cylinder wall for a long time, further aggravating the problem of uneven heating. The high-temperature exhaust gas generated during roasting is directly emitted, resulting in heat waste and failing to meet the requirements of energy conservation and environmental protection. Therefore, this invention provides a dual-heating roasting device to improve the flavor of coffee beans. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a dual-heating roasting device for enhancing the flavor of coffee beans, thereby solving the problems existing in the background art.

[0006] This invention provides the following technical solution: a dual-heating roasting device for enhancing the flavor of coffee beans, comprising a housing, wherein the housing has a main mounting cavity, a lower mounting cavity, and a rear mounting cavity; a roasting cylinder is rotatably mounted in the side wall of the main mounting cavity near the rear mounting cavity; a first heater is provided on the lower side of the roasting cylinder; and an internal heating mechanism is provided inside the roasting cylinder; a reverse drive mechanism is provided in the rear mounting cavity, which drives the roasting cylinder and the internal heating mechanism to work in opposite directions; a feed hopper and a discharge baffle are provided on the side of the housing; a support frame is provided on the lower side of the discharge baffle; a feed hopper and a stirrer are mounted on the support frame; the main mounting cavity and the lower mounting cavity are connected by a ventilation slot; an exhaust heat recovery mechanism is provided in the lower mounting cavity and connected to the lower side of the ventilation slot; the feed hopper is connected to the exhaust heat recovery mechanism through a rectangular channel to realize the recovery of heat energy from the main mounting cavity by the exhaust heat recovery mechanism and discharge into the feed hopper; and a controller is installed on the outside of the housing.

[0007] The internal heating mechanism includes a horizontal tube, a second heater, a spiral air outlet groove, a mesh cover, and an air inlet assembly. The horizontal tube is rotatably connected to the rotating shaft of the baking cylinder, the second heater is fixedly connected to the horizontal tube, the spiral air outlet groove is opened on the circumferential surface of the horizontal tube, and the mesh cover is fixedly connected to the circumferential surface of the horizontal tube. After the gas is introduced through the air inlet assembly and exchanges heat with the second heater, the gas enters the baking cylinder for internal heating.

[0008] Furthermore, the air intake assembly includes a fan, an air pipe, and an inner hollow ring. The fan is fixedly connected to the rear mounting cavity. One end of the air pipe is fixedly connected to the air outlet of the fan. One end of the horizontal pipe passes through the rear mounting cavity, and a positioning groove is provided at the passing part. Several air inlet holes are opened on the inner wall of the positioning groove. The inner hollow ring is rotatably connected to the air inlet holes, and the end of the air pipe is fixedly connected to the inner hollow ring.

[0009] Furthermore, several ventilation holes are opened on the circumferential surface of the baking cylinder, and an inner spiral strip is fixedly connected to the inner wall of the baking cylinder.

[0010] Furthermore, the reverse drive mechanism includes a cross frame, a double bearing frame, a servo motor, a first synchronous belt, a second synchronous belt, and a planetary gear set. The cross frame is fixedly connected to the side wall of the rear mounting cavity. The double bearing frame and the servo motor are both fixedly mounted on the top of the cross frame. A first driving wheel and a second driving wheel are rotatably mounted on the double bearing frame. The output end of the servo motor is fixedly connected to the first driving wheel. A first driven wheel is fixedly connected to the rotating shaft surface of the baking cylinder. The first synchronous belt drives the connection between the first driving wheel and the first driven wheel. A second driven wheel is fixedly connected to the circumferential surface of the cross tube. A second synchronous belt drives the connection between the second driving wheel and the second driven wheel. A planetary gear set is mounted on the upper side of the cross frame. The planetary gear set is concentrically connected between the first driving wheel and the second driving wheel.

[0011] Furthermore, the exhaust heat recovery mechanism includes an exhaust pipe, a heat exchanger, an exhaust fan, a water tank, and a circulation pipe. One end of the exhaust pipe is fixedly connected to the lower side of the ventilation slot. The heat exchanger and the exhaust fan are integrally connected and installed in the lower mounting cavity. The other end of the exhaust pipe is connected to the exhaust fan, and the other end is connected to the heat exchanger. The water tank is fixedly connected to the lower mounting cavity and is connected to the side of the heat exchanger through the circulation pipe. The circulation pipe is equipped with a water pump and valve assembly.

[0012] Furthermore, the side of the housing is provided with a sampler and a guide trough. The sampler is connected to the baking cylinder, the guide trough is located below the discharge baffle, and a valve is installed on the feed hopper.

[0013] Furthermore, the planetary gear set includes a sun gear, planet gears, and a ring gear. The ring gear is fixedly connected to the first driving gear, the sun gear is fixedly connected to the second driving gear, and the planet gears are fixedly connected to the upper side of the crossbeam via a bracket.

[0014] Furthermore, the mesh cover is made of high-temperature resistant stainless steel, and the mesh diameter on the mesh cover is 1-3mm; the pitch of the spiral air outlet groove is 5-8cm, and the spiral air outlet groove is interspersed with the inner spiral strips on the inner wall of the baking cylinder.

[0015] Furthermore, the heat exchanger is a shell-and-tube heat exchanger, the water tank is provided with an insulation layer on the outside, and the water tank is equipped with a temperature sensor and a liquid level sensor, which are electrically connected to the controller.

[0016] The technical effects and advantages of this invention are as follows: 1. This invention, by incorporating a first heater and an internal heating mechanism, facilitates stable overall temperature of the roasting cylinder. The internal heating mechanism, coaxially arranged inside the roasting cylinder, works in conjunction with a fan and a spiral air outlet to evenly deliver heated air to the gaps between the coffee beans, forming a dual heat transfer path of external radiation and internal convection. The reverse drive mechanism controls the reverse operation of the roasting cylinder and the internal heating mechanism, creating a relative shear force that breaks the unidirectional movement trajectory of the coffee beans, improves the uniformity of heating, avoids localized over-burning or under-roasting, ensures even contact with hot air, timely removal of moisture and odors, shortens the roasting cycle, improves roasting efficiency, reduces wear on the coffee bean skin, and ensures the integrity of the coffee beans.

[0017] 2. This invention, by incorporating an exhaust heat recovery mechanism, facilitates the efficient transfer of heat from the exhaust gas to the cold water during the roasting process. This is achieved by utilizing the heat exchange characteristics of the shell-and-tube heat exchanger's tube walls, which raises the water temperature to 40-60°C before it flows back to the water tank for storage. This process converts the heat energy from the exhaust gas into heat energy from the water, avoiding the waste of heat caused by the direct emission of high-temperature exhaust gas. It also provides a usable heat source for subsequent processes, aiding in the uniform cooling of the coffee beans after roasting and ensuring stable flavor.

[0018] 3. This invention, by incorporating a spiral air outlet groove and an inner spiral strip, facilitates a spatially interlaced arrangement of the spiral lines of the air outlet groove and the inner spiral strip. This interlaced distribution allows the coffee beans, propelled by the inner spiral strip towards the discharge end, to be forced to change their direction of movement by the reverse force of the spiral air outlet groove, forming a composite motion trajectory of spiral tumbling and radial diffusion. This ensures that each coffee bean is exposed to both the radiant heat of the roasting cylinder wall and the convective heat of the spiral air outlet groove during the roasting cycle. The composite motion trajectory also increases the gap between the coffee beans, making it easier for hot air to penetrate, improving heat exchange efficiency, and shortening the roasting time. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a side view of the structure of the present invention.

[0021] Figure 3 This is a cross-sectional view of the overall structure of the present invention.

[0022] Figure 4 This is a perspective structural diagram of the present invention.

[0023] Figure 5 This is a schematic diagram of the reverse drive mechanism of the present invention.

[0024] Figure 6 This is a schematic diagram of the baking cylinder structure of the present invention.

[0025] Figure 7 This is a schematic diagram of the internal heat source mechanism of the present invention.

[0026] Figure 8 For the present invention Figure 7 A schematic diagram of the explosion structure.

[0027] Figure 9 This is a schematic diagram of the exhaust heat recovery mechanism of the present invention.

[0028] Figure 10 This is a schematic diagram of the fan structure of the present invention. The attached figures are labeled as follows: 1. Shell; 101. Main mounting cavity; 1012. Ventilation slot; 102. Lower mounting cavity; 103. Rear mounting cavity; 104. Feed hopper; 1041. Valve; 105. Discharge baffle; 106. Guide chute; 107. Sample container; 2. Baking cylinder; 201. Vent hole; 202. Inner spiral strip; 3. First heater; 4. Internal heating mechanism; 401. Horizontal tube; 402. Second heater; 403. Spiral air outlet slot; 404. Mesh cover; 405. Positioning slot; 406. Air inlet; 407. Fan; 408. Air pipe; 409. 5. Hollow ring; 6. Reverse drive mechanism; 7. Cross frame; 8. Double bearing frame; 9. Servo motor; 10. First driving wheel; 11. First driven wheel; 12. First synchronous belt; 13. Second driving wheel; 14. Second driven wheel; 15. Second synchronous belt; 16. Planetary gear set; 17. Support frame; 18. Hopper; 19. Agitator; 20. Rectangular channel; 10. Exhaust heat recovery mechanism; 11. Exhaust duct; 12. Heat exchanger; 13. Exhaust fan; 14. Water tank; 15. Circulation pipe; 16. Controller. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The dual-heating roasting device for enhancing the flavor of coffee beans involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Reference Figures 1-10 This invention provides a dual-heating roasting device for enhancing the flavor of coffee beans, comprising a housing 1. The housing 1 contains a main mounting cavity 101, a lower mounting cavity 102, and a rear mounting cavity 103. A roasting cylinder 2 is rotatably mounted within the side wall of the main mounting cavity 101 near the rear mounting cavity 103. A first heater 3 is located on the lower side of the roasting cylinder 2, and an internal heating mechanism 4 is located inside the roasting cylinder 2. A reverse drive mechanism 5 is located in the rear mounting cavity 103, which drives the roasting cylinder 2 and the internal heating mechanism 4 to operate in opposite directions. A feed hopper 104 and a discharge hopper are located on the side of the housing 1. A baffle 105 is provided on the lower side of the discharge baffle 105. A hopper 601 and an agitator 602 are installed on the support frame 6. The main installation cavity 101 and the lower installation cavity 102 are connected by a ventilation slot 1012. An exhaust heat recovery mechanism 7 is provided in the lower installation cavity 102 and connected to the lower side of the ventilation slot 1012. The hopper 601 is connected to the exhaust heat recovery mechanism 7 through a rectangular channel 604 so as to realize that the hot air in the main installation cavity 101 is recovered by the exhaust heat recovery mechanism 7 and discharged into the hopper 601. A controller 8 is installed on the outside of the housing 1. The internal heating mechanism 4 includes a horizontal tube 401, a second heater 402, a spiral air outlet 403, a mesh cover 404, and an air inlet assembly. The horizontal tube 401 is rotatably connected to the rotating shaft of the baking cylinder 2. The second heater 402 is fixedly connected to the horizontal tube 401. The spiral air outlet 403 is opened on the circumferential surface of the horizontal tube 401. The mesh cover 404 is fixedly connected to the circumferential surface of the horizontal tube 401. After the gas is introduced through the air inlet assembly and exchanges heat with the second heater 402, the gas enters the baking cylinder 2 for internal heating.

[0031] In this embodiment, it should be specifically noted that: the shell 1 is a stainless steel splicing structure with a thickness of 3-5mm, possessing good high-temperature resistance and structural stability. Its internal main mounting cavity 101, lower mounting cavity 102, and rear mounting cavity 103 are separated by a heat-insulating partition. The partition uses aluminum silicate insulation material, which can effectively reduce heat transfer between chambers and prevent temperature interference between different functional areas. The main mounting cavity 101 serves as the core baking area, and its side wall near the rear mounting cavity 103 has a circular mounting hole. A double-row angular contact bearing is embedded in the hole to support one end of the baking cylinder 2, ensuring the coaxiality and stability of the baking cylinder 2 during rotation. The baking cylinder 2 is made of 304 stainless steel, and its end near the rear mounting cavity 103 is connected to the first driven wheel 505 via a coupling. The first heater 3 is an electric heating plate, and the distance between the heating plate and the outer wall of the baking cylinder 2 is maintained. The 5-8cm spacing prevents direct contact between the heating plate and the roasting cylinder 2, avoiding localized overheating while ensuring efficient radiant heating. A high-temperature resistant ceramic coating prevents coffee bean residue from sticking together. The horizontal tube 401 is coaxially aligned with the roasting cylinder 2, but its length is 5-10cm shorter. The horizontal tube 401 rotates independently, passing through the center of the rotating shaft of the roasting cylinder 2, maintaining coaxial but not directional rotation. During operation, heating is achieved through the horizontal tube 401, roasting coffee beans inside the roasting cylinder 2. The heating power of the second heater 402 is adjusted by the PID temperature control module of the controller 8. An internal temperature sensor monitors the temperature in real time. When the actual temperature is lower than the set value, the PID module increases the heating power; when it is higher, it decreases the power. The temperature control accuracy reaches ±1℃, achieving precise matching with the roasting stage.

[0032] The main difference between this embodiment and the prior art is that this embodiment adopts a dual heat source synergistic heating and exhaust heat energy circulation design, specifically: Dual heat source synergistic heating: A first heater 3 is set on the outside of the roasting cylinder 2 to achieve overall temperature stability of the roasting cylinder 2 through radiation heating. An internal heating mechanism 4 is set coaxially inside the roasting cylinder 2, which, together with the fan 407 and the spiral air outlet 403, evenly delivers the heated air to the gaps between the coffee beans, forming a dual heat transfer path of external radiation and internal convection. The reverse drive mechanism 5 controls the reverse operation of the roasting cylinder 2 and the internal heating mechanism 4, and the two form a relative shear force, breaking the unidirectional movement trajectory of the coffee beans, improving the heating uniformity of the coffee beans, avoiding local over-burning or under-roasting, even contact with hot air, timely removal of moisture and odors, shortening the roasting cycle, improving roasting efficiency, reducing wear on the surface of the coffee beans, and ensuring the integrity of the coffee beans.

[0033] The above structure is the main structure of this embodiment, which solves the problems of uneven heating of coffee beans, poor flavor consistency, serious energy waste and difficulty in controlling roasting quality in existing coffee bean roasting devices. The basic frame of the shell 1, the feeding hopper 104, etc. are existing structures. The specific structure and connection method of the feeding hopper 104, the discharge baffle 105 and the sampler 107 are not described in detail in this embodiment. In addition, the temperature control of the first heater 3, the horizontal tube 401, etc. are also existing technologies. Therefore, this application does not make detailed limitations.

[0034] Reference Figure 7-8 The air intake assembly includes a fan 407, an air pipe 408, and an inner hollow ring 409. The fan 407 is fixedly connected to the rear mounting cavity 103. One end of the air pipe 408 is fixedly connected to the air outlet of the fan 407. One end of the horizontal pipe 401 passes through the rear mounting cavity 103. A positioning groove 405 is provided at the passing part. Several air inlet holes 406 are opened on the inner wall of the positioning groove 405. The inner hollow ring 409 is rotatably connected to the air inlet holes 406. The end of the air pipe 408 is fixedly connected to the inner hollow ring 409.

[0035] In this embodiment, it should be specifically noted that: the fan 407 is a centrifugal high-temperature fan, one end of the air pipe 408 is fixed to the air outlet of the fan 407 by a quick-release clamp, the air pipe 408 is a metal pipe, which can support the position of the inner hollow ring 409 to remain stationary. When the horizontal pipe 401 rotates, the inner hollow ring 409 will not rotate. During operation, gas is introduced into the air pipe 408 through the fan 407, and then enters the inner hollow ring 409 through the air pipe 408. The gas enters the horizontal pipe 401 through the air inlet 406, and finally enters the baking cylinder 2 through the spiral air outlet groove 403.

[0036] Reference Figure 3 and Figure 8 A number of ventilation holes 201 are opened on the circumferential surface of the baking cylinder 2, and an inner spiral strip 202 is fixedly connected to the inner wall of the baking cylinder 2.

[0037] In this embodiment, it should be specifically noted that: the vent 201 is a circular through hole with a diameter of 2-4mm. This size can prevent coffee beans from falling out of the hole and ensure that the water vapor, carbon dioxide, and low-boiling-point odor substances generated during the roasting process can be discharged smoothly. At the same time, the diameter of less than 5mm can prevent a large amount of cold air from entering the roasting cylinder 2, avoid temperature fluctuations inside the cylinder, and ensure a stable roasting environment. The inner spiral strip 202 and the spiral air outlet 403 are spiraled in opposite directions. When the roasting cylinder 2 and the horizontal tube 401 rotate in opposite directions, they can provide relative shear force, which will cause the coffee beans to diffuse radially synchronously during axial movement, forming a composite motion trajectory of spiral tumbling and axial propulsion. This trajectory can ensure that each coffee bean can be evenly contacted with the inner wall of the roasting cylinder 2 and the hot air inside the roasting cylinder 2 during the roasting cycle, solving the problems of local over-burning and local under-roasting.

[0038] Reference Figures 4-5 The reverse drive mechanism 5 includes a crossbeam 501, a double bearing bracket 502, a servo motor 503, a first synchronous belt 506, a second synchronous belt 509, and a planetary gear set 5010. The crossbeam 501 is fixedly connected to the side wall of the rear mounting cavity 103. The double bearing bracket 502 and the servo motor 503 are both fixedly mounted on the top of the crossbeam 501. A first drive wheel 504 and a second drive wheel 507 are rotatably mounted on the double bearing bracket 502. The output end of the servo motor 503 is fixedly connected to the first drive wheel 504. The first driven wheel 505 is fixedly connected to the rotating shaft surface of the baking cylinder 2. The first synchronous belt 506 is driven between the first driving wheel 504 and the first driven wheel 505. The second driven wheel 508 is fixedly connected to the circumferential surface of the horizontal tube 401. The second synchronous belt 509 is driven between the second driving wheel 507 and the second driven wheel 508. The planetary gear set 5010 is installed on the upper side of the cross frame 501. The planetary gear set 5010 is concentrically connected between the first driving wheel 504 and the second driving wheel 507.

[0039] In this embodiment, it should be specifically noted that: the cross frame 501 is made of Q235 carbon steel and welded into an L-shaped structure. The double bearing frame 502 is used to support the rotation of the first drive wheel 504 and the second drive wheel 507. The first drive wheel 504 and the second drive wheel 507 are concentric. The planetary gear set 5010 plays a role in speed reduction. During operation, the first drive wheel 504 is driven to rotate through the output end of the servo motor 503. The first drive wheel 504 drives the first driven wheel 505 to rotate through the first synchronous belt 506, and then drives the baking cylinder 2 to rotate. At the same time, under the speed reduction effect of the planetary gear set 5010, the second drive wheel 507 is driven to rotate in the opposite direction. Then, the second driven wheel 508 is driven to rotate through the second synchronous belt 509, and finally drives the horizontal tube 401 to rotate, so that the baking cylinder 2 and the horizontal tube 401 rotate in opposite directions, and the speed of the horizontal tube 401 is less than that of the baking cylinder 2.

[0040] Reference Figure 9-10The exhaust heat recovery mechanism 7 includes an exhaust pipe 701, a heat exchanger 702, an exhaust fan 703, a water tank 704, and a circulation pipe 705. One end of the exhaust pipe 701 is fixedly connected to the lower side of the ventilation slot 1012. The heat exchanger 702 and the exhaust fan 703 are integrally connected and installed in the lower mounting cavity 102. The other end of the exhaust pipe 701 is connected to the exhaust fan 703. The end of the 704 is connected to the heat exchanger 702. The water tank 704 is fixedly connected to the lower mounting cavity 102 and is connected to the side of the heat exchanger 702 through the circulation pipe 705. The circulation pipe 705 is equipped with a water pump and valve assembly.

[0041] In this embodiment, it should be specifically noted that: the exhaust pipe 701 is connected to the main mounting cavity 101 through the ventilation slot 1012; the exhaust pipe 701 is made of stainless steel; the exhaust fan 703 is a centrifugal high-temperature fan; the water tank 704 is made of stainless steel and is fixed to the bottom of the lower mounting cavity 102 by a metal bracket; the outside of the water tank is wrapped with a 50mm thick rock wool insulation layer and covered with an aluminum foil protective layer to reduce heat loss; the circulation pipe 705 is made of food-grade stainless steel and has two sections, connecting the water tank 704 and the heat exchanger 702 to form a closed water circulation loop; all pipe connections are threaded and sealed to ensure no leakage; during operation, the exhaust fan 703 rotates at high speed to exhaust the hot air from the bottom of the main mounting cavity 101 into the heat exchanger 702 for heat exchange. In the process, the cooling water in the water tank 704 circulates between the heat exchangers 702, heating the cooling water in the heat exchangers 702 to a temperature of 40-60 degrees Celsius. The exhaust gas is cooled to 50-70 degrees Celsius and then discharged upwards from the bottom of the feed hopper 601. After the coffee beans are roasted, they enter the feed hopper 601. At this time, the first heater 3 and the horizontal pipe 401 are turned off, while the exhaust fan 703 continues to rotate, maintaining a warm air temperature of 25-30 degrees Celsius. This air enters the support frame 6 from 604 and is discharged upwards from the bottom of the feed hopper 601, providing uniform cooling for the coffee beans. This avoids the sudden temperature drop caused by traditional air cooling and reduces the loss of flavor substances. Maintaining a warm air temperature of 25-30 degrees Celsius can be finely adjusted by the auxiliary heating module, which is existing technology.

[0042] Reference Figure 1 The side of the housing 1 is provided with a sampler 107 and a guide trough 106. The sampler 107 is connected to the baking cylinder 2. The guide trough 106 is located below the discharge baffle 105. A valve 1041 is installed on the feed hopper 104.

[0043] In this embodiment, it should be specifically noted that the sampler 107 is made of 304 stainless steel, which has the characteristics of high temperature resistance and corrosion resistance, avoiding reaction with acidic substances released by coffee beans during roasting, ensuring that the sample is not contaminated, and extending the service life of the component. The sampler 107 is detachably connected to the side of the roasting cylinder 2 via a flange. A high temperature resistant sealing gasket is installed between the flanges to prevent hot air and coffee bean residue inside the roasting cylinder 2 from leaking out from the connection gap, ensuring the airtightness and temperature stability of the roasting environment. During the roasting process, the operator can pull the handle of the sampler 107 to insert the sample spoon into the roasting cylinder 2 to extract a small amount of coffee bean sample. The system monitors the roasting and ripening status of coffee beans to avoid over-roasting or under-roasting. The feed trough 106 is made of food-grade stainless steel with a polished surface to reduce frictional resistance during the descent of coffee beans, preventing the bean skins from peeling off and creating debris, while also facilitating the cleaning of residual coffee powder. The feed trough has an overall inclined design with an angle of 30°-45°, which ensures that the coffee beans fall naturally under gravity while preventing them from colliding and being damaged due to excessive speed. The valve 1041 is used to close the mounting cavity 103, acting as a valve.

[0044] Reference Figure 5 The planetary gear set 5010 includes a sun gear, planet gears and a ring gear. The ring gear is fixedly connected to the first driving gear 504, the sun gear is fixedly connected to the second driving gear 507, and the planet gears are fixedly connected to the upper side of the cross frame 501 through a bracket.

[0045] In this embodiment, it should be specifically explained that when the servo motor 503 drives the first drive wheel 504 to rotate, the gear ring fixedly connected to the first drive wheel 504 rotates synchronously with the first drive wheel 504. Since the planetary gears are fixed on the cross frame 501 by the bracket, they cannot revolve with the gear ring, but can only rotate around their own axis: the inner teeth of the gear ring mesh with the outer teeth of the planetary gears, driving the planetary gears to rotate; the outer teeth of the planetary gears then mesh with the outer teeth of the sun gear, driving the sun gear to rotate. Through the meshing transmission of the planetary gear set, the single power input of the servo motor 503 is converted into the reverse power output of the first drive wheel 504 and the second drive wheel 507, thereby driving the roasting cylinder 2 and the horizontal tube 401 to rotate in opposite directions. This reverse rotation can form a relative shearing force inside the roasting cylinder 2, breaking the unidirectional tumbling trajectory of the coffee beans, so that the coffee beans are pushed axially and spread and tumble radially, avoiding some coffee beans from sticking to the inner wall for a long time and solving the problem of uneven heating. By rationally designing the gear ratio of the sun gear and the gear ring, the rotation speed of the second drive wheel 507 can be precisely controlled, so that the rotation speed of the horizontal tube 401 is lower than that of the roasting cylinder 2. The lower rotation speed of the horizontal tube 401 can avoid excessive stirring of the coffee beans by the spiral air outlet 403 and the mesh cover 404, reduce the wear on the surface of the coffee beans, and at the same time ensure that hot air is evenly discharged from the spiral air outlet 403 and fully contacts the coffee beans, thereby improving the convection heating effect.

[0046] Reference Figure 4 The mesh cover 404 is made of high-temperature resistant stainless steel, and the mesh diameter on the mesh cover 404 is 1-3mm; the pitch of the spiral air outlet groove 403 is 5-8cm, and the spiral air outlet groove 403 is interspersed with the inner spiral strip 202 on the inner wall of the baking cylinder 2.

[0047] In this embodiment, it should be specifically noted that the mesh cover 404 is made of 310S. Made of high-temperature resistant stainless steel, an austenitic chromium-nickel alloy, this material boasts ultra-high temperature resistance, excellent corrosion resistance, and good mechanical strength, making it perfectly suited for the high-temperature working environment of roasting equipment. The mesh diameter is 1-3mm, preventing coffee beans from entering and ensuring even hot air discharge. The spiral lines of the spiral air outlet 403 and the inner spiral strip 202 are spatially intersecting. If the spiral air outlet 403 and the inner spiral strip 202 are distributed in the same direction, the coffee beans will only tumble in one direction, potentially causing some beans to remain in the same position in the roasting cylinder 2 for an extended period, resulting in uneven heating. The intersecting distribution allows the coffee beans, propelled by the inner spiral strip 202 towards the discharge end, to be forced to change direction by the reverse force of the spiral air outlet 403, forming a complex motion trajectory of spiral tumbling and radial diffusion. This ensures that each coffee bean is exposed to both radiant heat from the inner wall of the roasting cylinder 2 and convective heat from the spiral air outlet during the roasting cycle. The complex motion trajectory also increases the gap between the coffee beans, allowing hot air to penetrate more easily, improving heat exchange efficiency and shortening roasting time.

[0048] Reference Figure 4 The heat exchanger 702 is a shell-and-tube heat exchanger. The water tank 704 is equipped with an insulation layer on the outside. The water tank 704 is equipped with a temperature sensor and a liquid level sensor, and the temperature sensor and liquid level sensor are electrically connected to the controller 8.

[0049] In this embodiment, it should be specifically noted that the heat exchanger 702 mainly consists of five parts: shell, tube sheet, heat exchange tubes, baffle plate, and inlet / outlet pipes. The inlet / outlet pipes are connected to the circulation pipe 705. The connection structure between the heat exchange tubes and the tube sheet can withstand thermal expansion and contraction caused by temperature changes, avoiding leakage at the interface. The high-temperature exhaust gas generated by the baking cylinder 2 enters the heat exchanger 702 through the exhaust pipe 701. Under the guidance of the baffle plate, the exhaust gas flows along the length of the shell and exchanges heat with the cooling water in the tube side through the heat exchange tube wall. The heat in the exhaust gas is transferred to the cooling water. After its own temperature drops to 50-70℃, it is discharged from the discharge hopper 601. Cooling water enters the tube side from the inlet end of the circulation pipe 705, and after fully absorbing heat through the double-pass flow, the temperature rises to 40-60℃, and then flows back to the water tank 704 for storage from the outlet pipe; the exhaust fan 703 is installed between the exhaust pipe 701 and the heat exchanger 702 to provide power for the flow of exhaust gas and prevent exhaust gas leakage; the water pump on the circulation pipe 705 provides power for the flow of cooling water, so that the cooling water circulates between the tube side and the water tank 704 to achieve continuous heat recovery; when the water temperature in the water tank 704 reaches the set value, the controller 8 can adjust the water pump speed to reduce the cooling water flow rate and prevent the water temperature from being too high and affecting the heat exchange efficiency.

[0050] Working principle of the invention: The main problems solved in this embodiment are: by using a dual heat source synergistic heating design, the problem of uneven heating of coffee beans, local over-burning or under-roasting caused by the single outer heating of existing devices is solved; by using a reverse drive mechanism 5 to control the roasting cylinder 2 and the horizontal tube 401 to rotate in opposite directions, the problem of coffee beans only rotating in one direction with the roasting cylinder, the limited turning effect, and some coffee beans sticking to the cylinder wall for a long time, which aggravates uneven heating is solved; and by using an exhaust heat recovery mechanism 7 to exhaust and recover heat energy, the problem of heat waste caused by the direct emission of high-temperature exhaust gas from roasting and failure to meet energy conservation and environmental protection requirements is solved.

[0051] The specific steps are as follows: S1 Equipment Status Preparation: Open the side inspection door of the unit and check whether the roasting cylinder 2, first heater 3, internal heating mechanism 4, reverse drive mechanism 5, and exhaust heat recovery mechanism 7 are working properly. According to the type of coffee beans to be roasted, set the dynamic operating parameters through the controller 8. Remove impurities such as stones and moldy beans from the raw materials, pour them into the feed hopper 104, and close the inlet valve 1041 to prevent foreign objects from falling in. S2 Coffee Bean Feeding Operation: Upon receiving the start-up command, the first heater 3 preheats the roasting cylinder 2. After preheating, the valve 1041 is opened to control the coffee beans to fall into the roasting cylinder 2 at a uniform flow rate. After feeding, the valve 1041 is completely closed, and the roasting mode is started through the controller 8. The device automatically performs the following actions: the servo motor 503 is started, driving the roasting cylinder 2 and the horizontal tube 401 to rotate in opposite directions; the fan 407 and the second heater 402 are started, and cold air enters the horizontal tube 401 through the air pipe 408 and the inner air ring 409. After being heated to the set temperature, it is discharged from the spiral air outlet 403 and the mesh cover 404, realizing internal convection heating; the first heater 3 maintains the set temperature, realizing external radiation heating, and the two heat sources start together.

[0052] S3 Roasting Process Dynamic Monitoring and Adjustment: Three key data points can be viewed in real time via controller 8: temperature inside roasting cylinder 2, temperature inside horizontal tube 401, and water temperature recovered from water tank 704; adjustments are made in real time based on temperature status, and a sample inspection is performed every 2 minutes: open the pull handle on the outside of sampler 107, insert the sample spoon into roasting cylinder 2, extract 5-10g of coffee beans, observe the color and smell the aroma, and adjust the internal temperature according to the condition of the coffee beans.

[0053] S4 heat recovery system control: When the water temperature in water tank 704 exceeds 65℃, the controller automatically reduces the speed of the water pump in circulation pipe 705 to reduce the cooling water flow; if the water temperature is below 40℃, it automatically increases the speed of the water pump and increases the air volume of exhaust fan 703 to enhance the efficiency of exhaust heat recovery.

[0054] S5 Roasting Completed: When the coffee beans reach the target roasting level in color and aroma, and there is no obvious burnt or bitter taste, the cooling stage will automatically begin after the waiting time. After roasting, the device will automatically shut off the first heater 3 and the second heater 402, and switch to cooling mode. At this time, the discharge baffle 105 will be opened, and the coffee beans will fall into the feed hopper 601 through the guide chute 106. The blower 407 and exhaust fan 703 will continue to run. The 40-60℃ warm water in the water tank 704 will be finely adjusted to 25-30℃ by the auxiliary heating module and blown into 604 by the exhaust fan 703. The warm air will be discharged from the last support frame 6 to cool the coffee beans in the feed hopper 601 at a uniform temperature. After cooling is completed, the blower 407, exhaust fan 703 and circulating water pump will be turned off.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dual-heating roasting device for enhancing the flavor of coffee beans, comprising a housing (1), characterized in that: The housing (1) has a main mounting cavity (101), a lower mounting cavity (102), and a rear mounting cavity (103) inside. The baking cylinder (2) is rotatably mounted in the side wall of the main mounting cavity (101) near the rear mounting cavity (103). A first heater (3) is provided on the lower side of the baking cylinder (2), and an internal heating mechanism (4) is provided inside the baking cylinder (2). A reverse drive mechanism (5) is provided in the rear mounting cavity (103), which drives the baking cylinder (2) and the internal heating mechanism (4) to work in opposite directions. A feed hopper (104) and a discharge baffle (105) are provided on the side of the housing (1). A support frame (6) is provided on the lower side, and a hopper (601) and a stirrer (602) are installed on the support frame (6). The main mounting cavity (101) and the lower mounting cavity (102) are connected through a ventilation slot (1012). An exhaust heat recovery mechanism (7) is provided in the lower mounting cavity (102) and connected to the lower side of the ventilation slot (1012). The hopper (601) is connected to the exhaust heat recovery mechanism (7) through a rectangular channel (604) so ​​as to realize the heat energy recovery of the hot air in the main mounting cavity (101) by the exhaust heat recovery mechanism (7) and discharge it into the hopper (601). A controller (8) is installed on the outside of the housing (1). The internal heating mechanism (4) includes a horizontal tube (401), a second heater (402), a spiral air outlet groove (403), a mesh cover (404), and an air inlet assembly. The horizontal tube (401) is rotatably connected to the rotating shaft of the baking cylinder (2). The second heater (402) is fixedly connected to the horizontal tube (401). The spiral air outlet groove (403) is opened on the circumferential surface of the horizontal tube (401). The mesh cover (404) is fixedly connected to the circumferential surface of the horizontal tube (401). After the gas is introduced through the air inlet assembly and exchanges heat with the second heater (402), the gas enters the baking cylinder (2) for internal heating.

2. The dual-heating roasting device for enhancing coffee bean flavor according to claim 1, characterized in that: The air intake assembly includes a fan (407), an air pipe (408), and an inner hollow ring (409). The fan (407) is fixedly connected to the rear mounting cavity (103). One end of the air pipe (408) is fixedly connected to the air outlet of the fan (407). One end of the horizontal pipe (401) passes through the rear mounting cavity (103). A positioning groove (405) is provided at the passing part. Several air inlet holes (406) are opened on the inner wall of the positioning groove (405). The inner hollow ring (409) is rotatably connected to the air inlet hole (406). The end of the air pipe (408) is fixedly connected to the inner hollow ring (409).

3. The dual-heating roasting device for enhancing coffee bean flavor according to claim 2, characterized in that: The baking cylinder (2) has several ventilation holes (201) on its circumferential surface, and the inner wall of the baking cylinder (2) is fixedly connected with an inner spiral strip (202).

4. The dual-heating roasting device for enhancing coffee bean flavor according to claim 3, characterized in that: The reverse drive mechanism (5) includes a crossbeam (501), a double bearing bracket (502), a servo motor (503), a first synchronous belt (506), a second synchronous belt (509), and a planetary gear set (5010). The crossbeam (501) is fixedly connected to the side wall of the rear mounting cavity (103). The double bearing bracket (502) and the servo motor (503) are both fixedly mounted on the top of the crossbeam (501). The first drive wheel (504) and the second drive wheel (507) are rotatably mounted on the double bearing bracket (502). The output end of the servo motor (503) is fixedly connected to the first drive wheel (5010). 4) The first driven wheel (505) is fixedly connected to the rotating shaft surface of the baking cylinder (2). The first synchronous belt (506) is driven between the first driving wheel (504) and the first driven wheel (505). The second driven wheel (508) is fixedly connected to the circumferential surface of the horizontal tube (401). The second synchronous belt (509) is driven between the second driving wheel (507) and the second driven wheel (508). The planetary gear set (5010) is installed on the upper side of the cross frame (501). The planetary gear set (5010) is concentrically connected between the first driving wheel (504) and the second driving wheel (507).

5. The dual-heating roasting device for enhancing coffee bean flavor according to claim 4, characterized in that: The exhaust heat recovery mechanism (7) includes an exhaust pipe (701), a heat exchanger (702), an exhaust fan (703), a water tank (704), and a circulation pipe (705). One end of the exhaust pipe (701) is fixedly connected to the lower side of the ventilation slot (1012). The heat exchanger (702) and the exhaust fan (703) are integrally connected and installed in the lower mounting cavity (102). The other end of the exhaust pipe (701) is connected to the exhaust fan (703). The end of the rectangular channel (604) is connected to the heat exchanger (702). The water tank (704) is fixedly connected to the lower mounting cavity (102) and is connected to the side of the heat exchanger (702) through the circulation pipe (705). The circulation pipe (705) is equipped with a water pump and valve assembly.

6. The dual-heating roasting apparatus for enhancing coffee bean flavor according to claim 5, characterized in that: The side of the housing (1) is provided with a sampler (107) and a guide trough (106). The sampler (107) is connected to the baking cylinder (2). The guide trough (106) is located below the discharge baffle (105). A valve (1041) is installed on the feed hopper (104).

7. The dual-heating roasting device for enhancing coffee bean flavor according to claim 3, characterized in that: The planetary gear set (5010) includes a sun gear, planet gears and a ring gear. The ring gear is fixedly connected to the first driving gear (504), the sun gear is fixedly connected to the second driving gear (507), and the planet gears are fixedly connected to the upper side of the cross frame (501) by a bracket.

8. The dual-heating roasting device for enhancing coffee bean flavor according to claim 3, characterized in that: The mesh cover (404) is made of high temperature resistant stainless steel, and the mesh diameter on the mesh cover (404) is 1-3mm; the pitch of the spiral air outlet groove (403) is 5-8cm, and the spiral air outlet groove (403) and the inner spiral strip (202) on the inner wall of the baking cylinder (2) are interspersed.

9. The dual-heating roasting device for enhancing coffee bean flavor according to claim 4, characterized in that: The heat exchanger (702) is a shell-and-tube heat exchanger. The water tank (704) is provided with an insulation layer on the outside. The water tank (704) is provided with a temperature sensor and a liquid level sensor, and the temperature sensor and the liquid level sensor are electrically connected to the controller (8).

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