Coffee bean baking machine
By employing technologies such as a tumbling structure, a sealing structure, and negative pressure regulation, the problems of uneven heating, hot air leakage, and debris blockage in coffee bean roasters have been solved, achieving uniform heating and improved safety and stability.
Patent Information
- Application Number
- CN202610079329.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-21
- Publication Date
- 2026-02-27
AI Technical Summary
Existing coffee bean roasters tend to accumulate coffee beans under high loads, leading to uneven heating. Hot air leakage poses a risk of burns, and debris can easily clog the mesh during cooling, affecting heat dissipation efficiency. As a result, the equipment has low safety and stability.
The design incorporates a tumbling and sealing structure to prevent coffee beans from piling up. It ensures uniform heating through negative pressure control and dual heating methods, a stirring structure to prevent debris from clogging, a sealing plate to prevent hot air leakage, and integrated negative pressure waste collection.
It achieves uniform heating of coffee beans, improves equipment safety and roasting process stability, prevents hot air leakage and debris blockage, and improves processing efficiency and product consistency.
Smart Images
Figure CN121569979A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of roasting machines, in particular to a coffee bean roasting machine. BACKGROUND
[0002] Coffee beans are the seeds of coffee tree fruits, and green beans are obtained after processing to remove the outer skin, pulp and silver skin. Green beans do not have the unique aroma and flavor of coffee, and need to be roasted to stimulate the internal aromatic substances and improve the taste. Therefore, roasting is the core process in coffee bean processing that determines the final quality. With the expansion of the coffee consumption market, the efficiency, stability and standardization requirements of coffee bean roasting in commercial and home scenarios are constantly improving. Traditional manual roasting methods cannot meet the needs of large-scale production. Coffee bean roasting machines, as key equipment for efficient and controllable roasting, directly affect the roasting quality and processing efficiency of coffee beans, and have become one of the core equipment in the coffee processing industry.
[0003] However, in the roasting operation of the coffee bean roasting machine, when the amount of coffee beans put into the rotating drum is large, the coffee beans are prone to form local accumulation under the combined action of their own gravity and the centrifugal force of the rotating drum. The existing rotating drum internal stirring structure is mostly fixed with a scoop, which cannot fully scatter the accumulated coffee beans, resulting in insufficient contact of the coffee beans in the accumulation area with the hot air flow, uneven heating, and over-roasting of some coffee beans and under-roasting of others, affecting the consistency of the finished product. In the sampling link, the rotating drum is in a high-temperature hot air circulation positive pressure environment during the roasting process. The sampling tube is pulled out instantaneously, and the high-temperature hot air is easily discharged from the sampling port without obstruction. Not only will it cause heat loss and disrupt the temperature balance of the roasting chamber, but it will also pose a risk of burns to the operator due to direct contact with the high-temperature hot air. The safety of the equipment is low. In the cooling station, the equipment cools by stirring the coffee beans and using a mesh plate to ventilate. The debris generated during the stirring process is easily stuck in the mesh plate pores, causing the mesh plate ventilation holes to be blocked after long-term use, resulting in a significant decrease in ventilation effect, and the heat cannot be quickly dissipated, ultimately prolonging the cooling time. SUMMARY
[0004] The purpose of the present application is to provide a coffee bean roasting machine to solve the problems raised in the background.
[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A coffee bean roasting machine, comprising a roasting machine body, a rotating shaft rotatably connected to the roasting machine body, a rotating drum fixedly connected to the rotating shaft, a connecting pipe fixedly connected to the roasting machine body, a sampling pipe slidably connected to the connecting pipe, a cooling device mounted on the roasting machine body, a stirring structure mounted on the roasting machine body and the rotating shaft, a driving structure mounted on the stirring structure, and a sealing structure mounted on the connecting pipe. The stirring structure comprises a transmission shaft rotatably connected to the cooling device and a connecting column fixedly connected to the transmission shaft, a net plate is slidably connected to the connecting column, a connecting frame is fixedly connected to the cooling device, the transmission shaft is rotatably connected to the connecting frame, the driving structure comprises a mounting shaft rotatably connected to the connecting frame and a second gear fixedly connected to the mounting shaft, three driving blocks are fixedly connected to the second gear in a circumferential array, two slopes are arranged on the driving blocks, two guide rods are fixedly connected to the net plate, a connecting shaft is rotatably connected to one of the guide rods, a roller is fixedly connected to the connecting shaft, the roller is rollingly matched with the driving blocks, a guide block is fixedly connected to the guide rod, a first spring is fixedly connected between the guide block and the cooling device, a first gear is fixedly connected to the transmission shaft, and the first gear is engaged with the second gear.
[0006] In order to realize efficient stirring of coffee beans in the cooling device, as a preferred scheme of the present application, a stirring rod is fixedly connected to the connecting column, a first driving member is mounted on the connecting frame, and the transmission shaft is driven to rotate through the first driving member.
[0007] In order to limit and protect the sliding track of the guide block, as a preferred scheme of the present application, a protective sleeve is fixedly connected to the cooling device, and the guide block is slidably connected to the protective sleeve.
[0008] In order to fully turn over the coffee beans in the rotating drum, as a preferred scheme of the present application, the turning structure comprises a fixed frame fixedly connected to the roaster body and a stirring shaft rotatably connected to the fixed frame, and a plurality of stirring rods are fixedly connected to the stirring shaft.
[0009] In order to drive the stirring shaft to rotate synchronously, as a preferred scheme of the present application, a third gear is fixedly connected to the stirring shaft, a fourth gear is engaged with the third gear, the fourth gear is fixedly connected to a rotating shaft, a second driving member is mounted on the roaster body, and the rotating shaft is driven to rotate through the second driving member.
[0010] In order to control the air pressure in the roaster body, as a preferred scheme of the present application, the roaster body is provided with a negative pressure structure, the negative pressure structure comprises a negative pressure dust collecting device mounted on the roaster body and a pressure sensor mounted in the roaster body, and an air duct is mounted in the roaster body.
[0011] In order to accurately detect the change of air pressure in the air duct, as a preferred scheme of the present application, a probe of the pressure sensor is mounted on the air duct, and a heating sheet is mounted in the roaster body.
[0012] In order to seal the connecting pipe port after the sampling pipe is drawn, as a preferred scheme of the present application, the sealing structure comprises a mounting sleeve fixedly connected to the connecting pipe and a sealing plate slidingly connected between the mounting sleeve and the connecting pipe, and the sealing plate is fixedly connected with a connecting rod.
[0013] In order to realize convenient sliding and resetting of the sealing plate, as a preferred scheme of the present application, a guide column is fixedly connected to the connecting pipe, the connecting rod is slidingly connected with the guide column, a knob is threadedly connected to the guide column, and a second spring is fixedly connected between the connecting rod and the knob.
[0014] In order to collect the debris generated in the roasting process, as a preferred scheme of the present application, the roaster body is provided with a first waste hopper and a second waste hopper, the first waste hopper is located at the bottom of the negative pressure dust collecting device, the second waste hopper is located at the bottom of the rotating drum, the rotating drum is provided with mesh holes, and the roaster body is provided with a feeding port.
[0015] Compared with the prior art, the present application has the following advantages: The roaster body and the rotating shaft are provided with a turning structure, which continuously scoops up the coffee beans in the rotating drum and throws them, so that the coffee beans are uniformly turned in the rotating drum, avoiding local accumulation and causing uneven heating, and further improving the turning effect of the coffee beans in cooperation with the rotation of the rotating drum.
[0016] The connecting pipe is provided with a sealing structure, which seals the gap between the connecting pipe and the sampling pipe, effectively preventing the hot air from leaking out of the sampling port during the roasting process, preventing the operator from being scalded by high-temperature hot air, and maintaining the stability of the hot air pressure and temperature in the roasting cavity, improving the safety of equipment operation and the stability of the roasting process.
[0017] The cooling device is provided with a stirring structure, and the stirring structure is provided with a driving structure, so that the stirring structure and the driving structure are used in cooperation to realize the up-and-down reciprocating motion of the mesh plate while stirring, effectively preventing the coffee bean debris from accumulating and blocking on the mesh plate and affecting the cooling effect. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of the present application; Figure 2 It is a connecting structure schematic diagram of the rotating drum and the rotating shaft of the present application; Figure 3 It is Figure 2 It is an enlarged schematic diagram of the A part structure shown in the figure; Figure 4 It is Figure 3 It is an enlarged schematic diagram of the B part structure shown in the figure; Figure 5 It is a connecting structure schematic diagram of the negative pressure dust collecting device and the roaster body of the present application; Figure 6 It is the schematic view of the connecting structure of the second gear and the driving block of the application; Figure 7 It is the schematic view of the connecting structure of the sampling pipe and the connecting pipe of the application; Figure 8 It is the schematic view of the connecting structure of the stirring shaft and the third gear of the application.
[0019] In the figure: 1, the roasting machine body; 2, the stirring structure; 201, the transmission shaft; 202, the connecting column; 203, the stirring rod; 204, the mesh plate; 205, the connecting frame; 206, the first driving part; 207, the first gear; 3, the driving structure; 301, the mounting shaft; 302, the second gear; 303, the driving block; 304, the slope; 305, the guide rod; 306, the protective sleeve; 307, the guide block; 308, the first spring; 309, the connecting shaft; 310, the roller; 4, the overturning structure; 401, the fixed frame; 402, the stirring shaft; 403, the third gear; 404, the copy rod; 405, the fourth gear; 5, the sealing structure; 501, the mounting sleeve; 502, the sealing plate; 503, the connecting rod; 504, the guide column; 505, the knob; 506, the second spring; 6, the negative pressure structure; 601, the negative pressure dust collecting device; 602, the pressure sensor; 603, the air duct; 604, the heating sheet; 7, the rotating shaft; 8, the rotating drum; 9, the feeding port; 10, the second driving part; 11, the first waste hopper; 12, the second waste hopper; 13, the cooling device; 14, the connecting pipe; 15, the sampling pipe. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.
[0021] Please refer to Figures 1-8 The application provides a technical solution: a coffee bean roasting machine, comprising a roasting machine body 1, a rotating shaft 7 rotatably connected to the roasting machine body 1, a rotating drum 8 fixedly connected to the rotating shaft 7, a connecting pipe 14 fixedly connected to the roasting machine body 1, a sampling pipe 15 slidably connected to the connecting pipe 14, a cooling device 13 mounted on the roasting machine body 1, an overturning structure 4 mounted on the roasting machine body 1 and the rotating shaft 7, a stirring structure 2 mounted on the cooling device 13, a driving structure 3 mounted on the stirring structure 2, and a sealing structure 5 mounted on the connecting pipe 14. The stirring structure 2 comprises a transmission shaft 201 rotatably connected to the cooling device 13, a connecting column 202 fixedly connected to the transmission shaft 201, a mesh plate 204 slidably connected to the connecting column 202, a connecting frame 205 fixedly connected to the cooling device 13, and the transmission shaft 201 is rotatably connected to the connecting frame 205, the driving structure 3 comprises a mounting shaft 301 rotatably connected to the connecting frame 205 and a second gear 302 fixedly connected to the mounting shaft 301, three driving blocks 303 are fixedly connected in a circumferential array on the second gear 302, two slopes 304 are arranged on the driving blocks 303, two guide rods 305 are fixedly connected to the mesh plate 204, one of the guide rods 305 is rotatably connected with a connecting shaft 309, a roller 310 is fixedly connected to the connecting shaft 309, the roller 310 is rollingly matched with the driving blocks 303, a guide block 307 is fixedly connected to the guide rod 305, the guide block 307 is fixedly connected with the first spring 308 between the cooling device 13, a first gear 207 is fixedly connected to the transmission shaft 201, and the first gear 207 is engaged with the second gear 302.
[0022] The stirring rod 203 is fixedly connected to the connecting column 202, the first driving part 206 is arranged on the connecting frame 205, the transmission shaft 201 is driven to rotate through the first driving part 206, the protective sleeve 306 is fixedly connected to the cooling device 13, and the guide block 307 is slidably connected with the protective sleeve 306.
[0023] In specific use, the first driving part 206 (preferably a motor) is started, the first driving part 206 drives the transmission shaft 201 and the connecting column 202 to rotate, the first gear 207 on the transmission shaft 201 drives the second gear 302 and the mounting shaft 301 to rotate, the three driving blocks 303 in a circumferential array on the second gear 302 make circumferential motion with the shaft, the slopes 304 on the driving blocks 303 are rollingly matched with the roller 310, the guide rod 305 and the mesh plate 204 are pushed to move upward, at the same time, the guide block 307 compresses the first spring 308, when the slopes 304 of the driving blocks 303 are separated from the roller 310, the elastic restoring force of the first spring 308 pulls the guide rod 305 and the mesh plate 204 to move downward, thus reciprocating, the upward and downward reciprocating motion of the mesh plate 204 is realized, and the accumulation and blockage of coffee bean debris on the mesh plate 204 are effectively prevented, so that the cooling effect is affected.
[0024] The turning structure 4 comprises a fixed frame 401 fixedly connected to the roasting machine body 1 and a stirring shaft 402 rotatably connected to the fixed frame 401, a plurality of stirring rods 404 are fixedly connected to the stirring shaft 402, a third gear 403 is fixedly connected to the stirring shaft 402, a fourth gear 405 is engaged with the third gear 403, the fourth gear 405 is fixedly connected with the rotating shaft 7, the second driving part 10 is arranged on the roasting machine body 1, and the rotating shaft 7 is driven to rotate through the second driving part 10.
[0025] In specific use, the second driving member 10 (preferably a motor) is started to drive the rotating shaft 7 to drive the rotating drum 8 to rotate synchronously, at the same time, the fourth gear 405 fixedly connected to the rotating shaft 7 rotates to drive the third gear 403 and the stirring shaft 402 to rotate through the gear meshing effect, the plurality of scraping rods 404 on the stirring shaft 402 rotate to continuously scrape and throw the coffee beans in the rotating drum 8, so that the coffee beans are uniformly turned in the rotating drum 8, avoiding local accumulation to cause uneven heating, and further improving the turning effect of the coffee beans in cooperation with the rotation of the rotating drum 8.
[0026] The roaster body 1 is provided with a negative pressure structure 6, which includes a negative pressure dust collection device 601 mounted on the roaster body 1 and a pressure sensor 602 mounted in the roaster body 1. The roaster body 1 is provided with an air duct 603, and the probe of the pressure sensor 602 is mounted on the air duct 603. The roaster body 1 is provided with a heating sheet 604.
[0027] In specific use, the negative pressure dust collection device 601 forms a negative pressure environment in the roaster body 1, and the external air is heated by the heating sheet 604 to form a hot air flow. The hot air flow enters the inside of the rotating drum 8 through the air duct 603 and the mesh holes on the rotating drum 8 to heat the coffee beans by hot air. At the same time, the heat of the heating sheet 604 is directly conducted to the outer surface of the rotating drum 8 to assist in heating the coffee beans through the heat conduction of the rotating drum 8. The double heating mode greatly improves the heat exchange efficiency, ensures the uniform heating of the coffee beans, and the probe of the pressure sensor 602 monitors the negative pressure of the air duct 603. According to the air pressure data, the energy density in the current heating process is calculated, and the wind power of the negative pressure dust collection device 601 is adjusted according to the calculation result, so as to accurately control the heating rate of the coffee beans and ensure that the roasting effect meets the preset requirements.
[0028] The sealing structure 5 includes a mounting sleeve 501 fixedly connected to the connecting pipe 14 and a sealing plate 502 slidingly connected between the mounting sleeve 501 and the connecting pipe 14. The sealing plate 502 is fixedly connected with a connecting rod 503, the connecting pipe 14 is fixedly connected with a guide column 504, the connecting rod 503 and the guide column 504 are slidingly connected, the guide column 504 is threadedly connected with a knob 505, and the connecting rod 503 and the knob 505 are fixedly connected with a second spring 506.
[0029] In specific use, the operator can push the sampling pipe 15 to slide along the connecting pipe 14, the sampling pipe 15 is inserted into the rotating drum 8 to take samples, and after sampling is completed, the sampling pipe 15 is pulled out, and the second spring 506 is elastically reset to push the connecting rod 503 and the sealing plate 502 to slide to seal the gap between the connecting pipe 14 and the sampling pipe 15. This can effectively prevent the hot air from leaking from the sampling port during the roasting process, prevent the operator from being scalded by high-temperature hot air, maintain the stability of the hot air pressure and temperature in the roasting cavity, and improve the equipment operation safety and the roasting process stability.
[0030] The first waste hopper 11 is arranged at the bottom of the negative pressure dust collecting device 601, and the second waste hopper 12 is arranged at the bottom of the rotary drum 8.
[0031] In use, the waste such as coffee bean silver skin generated in the roasting process is sucked into the air duct 603 under the action of negative pressure suction and finally collected in the first waste hopper 11, and part of the waste that is not sucked in time falls into the second waste hopper 12 at the bottom of the rotary drum 8 in the turning process, realizing efficient separation and collection of the waste, avoiding the influence of silver skin residue on the flavor of coffee beans, and ensuring the smoothness of the mesh of the rotary drum 8 and the air duct 603.
[0032] Working principle: first, the operator puts the raw coffee beans to be roasted into the rotary drum 8 through the feed port 9 of the roaster body 1, starts the second driving member 10 (preferably a motor), and drives the rotary drum 8 to rotate synchronously. At the same time, the fourth gear 405 fixedly connected to the shaft 7 rotates and drives the third gear 403 and the stirring shaft 402 to rotate through the gear meshing effect, and the multiple scoops 404 on the stirring shaft 402 rotate with the shaft to continuously scoop up the coffee beans in the rotary drum 8 and throw them, so that the coffee beans are uniformly turned in the rotary drum 8, avoiding local accumulation leading to uneven heating, and further improving the turning effect of the coffee beans. At the same time, the negative pressure dust collecting device 601 forms a negative pressure environment in the roaster body 1, the external air is heated by the heating sheet 604 to form a hot air flow, the hot air flow enters the rotary drum 8 through the air duct 603 and the mesh on the rotary drum 8, and the heat of the heating sheet 604 is directly transmitted to the outer surface of the rotary drum 8, and the heat of the heating sheet 604 is directly transmitted to the outer surface of the rotary drum 8. The heat conduction of the rotary drum 8 realizes auxiliary heating of the coffee beans, and the double heating mode greatly improves the heat exchange efficiency, ensures uniform heating of the coffee beans, and accurately controls the heating rate of the coffee beans according to the wind pressure data. The pressure sensor 602 monitors the negative pressure wind pressure in the air duct 603, adjusts the wind power of the negative pressure dust collecting device 601 according to the energy density in the current heating process, accurately controls the heating rate of the coffee beans, ensures that the roasting effect meets the preset requirements, and realizes efficient separation and collection of the waste. The waste such as coffee bean silver skin generated in the roasting process is sucked into the air duct 603 under the action of negative pressure suction and finally collected in the first waste hopper 11, and part of the waste that is not sucked in time falls into the second waste hopper 12 at the bottom of the rotary drum 8 in the turning process, realizing efficient separation and collection of the waste, avoiding the influence of silver skin residue on the flavor of coffee beans, and ensuring the smoothness of the mesh of the rotary drum 8 and the air duct 603. Secondly, during the whole roasting and cooling process, if it is necessary to sample and detect the roasting state of the coffee beans, the operator can push the sampling tube 15 to slide along the connecting tube 14, the sampling tube 15 extends into the drum 8 to sample, after sampling, the sampling tube 15 is pulled out, at the same time, the second spring 506 is elastically reset, the connecting rod 503 and the sealing plate 502 are pushed to slide, the gap between the connecting tube 14 and the sampling tube 15 is sealed, which can effectively avoid the hot air from leaking out of the sampling port during the roasting process, prevent the operator from being scalded by the high-temperature hot air, maintain the stability of the hot air pressure and temperature in the roasting cavity, improve the equipment operation safety and the roasting process stability, the operator can also adjust the compression amount of the second spring 506 by rotating the knob 505, accurately control the sealing pressure of the sealing plate 502, further improve the sealing effect, avoid the heat loss and the roasting effect fluctuation caused by the hot air leakage; Finally, after the roasting of the coffee beans is completed, the operator controls the drum 8 to rotate, the roasted coffee beans are discharged to the screen plate 204 of the cooling device 13, the first driving member 206 (preferably a motor) is started, the first driving member 206 drives the transmission shaft 201 and the connecting column 202 to rotate, the first gear 207 on the transmission shaft 201 drives the second gear 302 and the mounting shaft 301 to rotate, the three driving blocks 303 arranged in a circle on the second gear 302 make circular motion with the shaft, the slope 304 on the driving block 303 is in rolling fit with the roller 310, the guide rod 305 and the screen plate 204 are pushed to move upward, at the same time, the guide block 307 compresses the first spring 308, when the slope 304 of the driving block 303 is separated from the roller 310, the elastic reset force of the first spring 308 pulls the guide rod 305 and the screen plate 204 to move downward, thus, the screen plate 204 realizes the up-down reciprocating motion, which effectively prevents the coffee bean debris from piling up on the screen plate 204 to affect the cooling effect, the stirring rod 203 on the connecting column 202 rotates with the transmission shaft 201, continuously stirs the coffee beans on the screen plate 204, accelerates the heat dissipation of the coffee beans in cooperation with the reciprocating motion of the screen plate 204, greatly shortens the cooling time, the guide block 307 is in sliding connection with the protective sleeve 306, the protective sleeve 306 plays a limiting and guiding role in the sliding of the guide block 307, guarantees the stability of the reciprocating motion of the screen plate 204, avoids the jamming during the motion process, when the coffee beans are cooled to the preset temperature, the operator manually pulls out the sealing plate of the discharge port of the cooling device 13, the coffee beans are discharged through the discharge port, and the whole processing flow is completed.
[0033] The contents not described in detail in the description belong to the prior art known to those skilled in the art, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A coffee bean roaster, comprising a roaster body (1), a rotating shaft (7) rotatably connected to the roaster body (1), a rotating drum (8) fixedly connected to the rotating shaft (7), a connecting pipe (14) fixedly connected to the roaster body (1), a sampling pipe (15) slidably connected to the connecting pipe (14), and a cooling device (13) installed on the roaster body (1), characterized in that: The following structures are installed on the baking machine body (1) and the rotating shaft (7): a tumbling structure (4), a stirring structure (2) on the cooling device (13), a driving structure (3) on the stirring structure (2), and a sealing structure (5) on the connecting pipe (14). The stirring structure (2) includes a drive shaft (201) rotatably connected to the cooling device (13) and a connecting column (202) fixedly connected to the drive shaft (201). A mesh plate (204) is slidably connected to the connecting column (202). A connecting frame (205) is fixedly connected to the cooling device (13). The drive shaft (201) and the connecting frame (205) are rotatably connected. The driving structure (3) includes a mounting shaft (301) rotatably connected to the connecting frame (205) and a second gear (302) fixedly connected to the mounting shaft (301). Three driving blocks (303) are fixedly connected in a circumferential array on the second gear (302). The drive block (303) is provided with two ramps (304), and two guide rods (305) are fixedly connected to the mesh plate (204). One of the guide rods (305) is rotatably connected to a connecting shaft (309), and a roller (310) is fixedly connected to the connecting shaft (309). The roller (310) rolls with the drive block (303). A guide block (307) is fixedly connected to the guide rod (305), and a first spring (308) is fixedly connected between the guide block (307) and the cooling device (13). A first gear (207) is fixedly connected to the transmission shaft (201), and the first gear (207) meshes with the second gear (302).
2. The coffee bean roaster according to claim 1, characterized in that: A stirring rod (203) is fixedly connected to the connecting column (202), and a first driving component (206) is installed on the connecting frame (205). The transmission shaft (201) is driven to rotate by the first driving component (206).
3. A coffee bean roaster according to claim 1, characterized in that: A protective sleeve (306) is fixedly connected to the cooling device (13), and the guide block (307) is slidably connected to the protective sleeve (306).
4. A coffee bean roaster according to claim 1, characterized in that: The flipping structure (4) includes a fixed frame (401) fixedly connected to the baking machine body (1) and a stirring shaft (402) rotatably connected to the fixed frame (401). Multiple lifting rods (404) are fixedly connected to the stirring shaft (402).
5. A coffee bean roaster according to claim 4, characterized in that: A third gear (403) is fixedly connected to the stirring shaft (402), and a fourth gear (405) meshes with the third gear (403). The fourth gear (405) is fixedly connected to the rotating shaft (7). A second driving component (10) is installed on the baking machine body (1), and the rotating shaft (7) is driven to rotate by the second driving component (10).
6. A coffee bean roaster according to claim 1, characterized in that: The baking machine body (1) is provided with a negative pressure structure (6), the negative pressure structure (6) includes a negative pressure dust collection device (601) installed on the baking machine body (1) and a pressure sensor (602) installed inside the baking machine body (1), and an air duct (603) is installed inside the baking machine body (1).
7. A coffee bean roaster according to claim 6, characterized in that: The probe of the pressure sensor (602) is installed on the air duct (603), and a heating element (604) is installed inside the baking machine body (1).
8. A coffee bean roaster according to claim 1, characterized in that: The sealing structure (5) includes an mounting sleeve (501) fixedly connected to the connecting pipe (14) and a sealing plate (502) slidably connected between the mounting sleeve (501) and the connecting pipe (14), and a connecting rod (503) is fixedly connected to the sealing plate (502).
9. A coffee bean roaster according to claim 8, characterized in that: A guide post (504) is fixedly connected to the connecting pipe (14), the connecting rod (503) is slidably connected to the guide post (504), a knob (505) is threadedly connected to the guide post (504), and a second spring (506) is fixedly connected between the connecting rod (503) and the knob (505).
10. A coffee bean roaster according to claim 1, characterized in that: The baking machine body (1) is equipped with a first waste hopper (11) and a second waste hopper (12). The first waste hopper (11) is located at the bottom of the negative pressure dust collection device (601), and the second waste hopper (12) is located at the bottom of the rotating drum (8). The rotating drum (8) is provided with mesh holes, and the baking machine body (1) is provided with a feed inlet (9).