Tea microwave-assisted low-temperature drying device

Abstract

The application relates to the technical field of tea processing, and provides a microwave-assisted low-temperature drying device for tea leaves, which comprises a rack, a conveyor set driven by a motor is arranged on the top side of the rack to convey a material bearing frame loaded with tea leaves to be dried, so that a plurality of material bearing frames are continuously sent into a sealed low-pressure drying chamber to sequentially undergo vacuum low-temperature condensation and microwave drying sublimation to remove water in the tea leaves; a frame body is arranged at the rear end of the rack, a rotating frame is rotatably connected to the top end of the frame body, and two clamping frames are connected to one side of the rotating frame through a traction set. Through integrated continuous operation design, vacuum freezing and microwave sublimation drying can be sequentially completed in the sealed low-pressure chamber, and then the dried tea leaves are automatically lifted, clamped, turned over, unloaded and the empty material bearing frame is automatically homed, so that the labor intensity is greatly reduced, and the stability and consistency of the production process are ensured.

Description

Technical Field

[0001] This invention relates to the field of tea processing technology, specifically to a microwave-assisted low-temperature drying device for tea. Background Technology

[0002] Fermented tea refers to any tea that undergoes a fermentation process during its production. Fermentation is the process by which tea leaves undergo enzymatic oxidation to form dark-colored substances such as theaflavins and thearubigins. Fermentation typically takes place in specialized rooms with controlled temperature and humidity. Many factors influence fermentation, including temperature, humidity, and the moisture content of the leaves. Traditionally, fermented tea is made by withering, rolling, fermenting, and drying tea buds and leaves to create raw tea, which is then further refined. Fermented tea can be categorized into lightly fermented tea, semi-fermented tea, fully fermented tea, and post-fermented tea. Fermented tea is believed to have beneficial effects on the stomach and intestines, primarily because the chemical substances within the tea leaves undergo transformation during fermentation, making the tea milder and less irritating to the digestive system. Furthermore, fermented tea is said to regulate blood lipids and blood sugar, and accelerate digestion.

[0003] After fermentation, fermented tea needs to be dried at high temperatures to rapidly deactivate the oxidases in the tea leaves, forcibly stopping the fermentation process, fixing the color, aroma, and flavor of the tea, and deactivating the enzymes to complete fermentation. When vacuum microwave technology is used for drying, the tea leaves are typically condensed at low temperatures in a vacuum, causing the moisture to freeze. Subsequently, the microwave power is controlled at 200-300W in a vacuum environment to carry out sublimation drying. This effectively preserves the nutrients in the tea leaves, such as vitamin C and vitamin E, prevents oxidation, and maintains the tea's bright green color and rich aroma.

[0004] Existing vacuum microwave drying equipment separates vacuum cryogenic freezing and microwave sublimation drying into two independent workstations or devices. After freezing, tea leaves need to be manually or with auxiliary equipment transferred to the drying chamber. This not only increases production steps and time but also risks the tea leaves reheating, frosting, or becoming contaminated due to exposure to air during transfer, affecting drying efficiency and product quality. Furthermore, the unloading process after drying largely relies on manual operation or simple tilting mechanisms, resulting in low automation, limited production efficiency, and the potential for tea leaf breakage or cross-contamination. Therefore, a microwave-assisted cryogenic drying device for tea is needed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a microwave-assisted low-temperature drying device for tea. This solves the problem that existing vacuum microwave drying equipment separates vacuum low-temperature freezing and microwave sublimation drying into two independent workstations or devices. After freezing, the tea leaves need to be manually or using auxiliary equipment to transfer them to the drying chamber, which not only increases production steps and time but also may cause the tea leaves to reheat, frost, or become contaminated due to exposure to air during the transfer process, affecting drying efficiency and product quality. Furthermore, the unloading process after drying largely relies on manual operation or simple tilting mechanisms, resulting in low automation, limited production efficiency, and potential problems such as tea leaf breakage or cross-contamination.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A microwave-assisted low-temperature drying device for tea includes:

[0008] The frame, on its top side, is conveyed by a conveyor unit driven by a motor to transport multiple frames of tea leaves to be dried. These frames are then continuously sent to a sealed, low-pressure drying chamber for vacuum low-temperature condensation and microwave drying sublimation to remove moisture from the tea leaves.

[0009] The frame is located at the rear end of the machine frame. A rotating frame is rotatably connected to the top of the frame. Two clamping frames are connected to one side of the rotating frame through a traction unit to clamp a material receiving frame containing dried tea leaves. The lifting component cooperates to lift the material receiving frame and triggers the traction unit to clamp it by a push head. The lifting component is connected to the sealed drying low-pressure chamber through a connecting rod.

[0010] The roller is driven to rotate by a motor. The roller is equipped with a cam trigger unit. One end of the cam trigger unit is connected to a rotating component through a lifting frame to rotate and flip the rotating frame, thereby unloading the dried tea leaves with one click. The other end of the cam trigger unit is connected to a trigger component through an abutment rod. After unloading is completed, the trigger unit abuts the traction unit through the trigger-connected push head to release the material receiving frame and remove the material receiving frame together.

[0011] Preferably, the conveyor unit includes multiple sprockets and two chains rotatably connected to the front and rear ends of the frame, the sprockets at the left and right ends are connected by a rotating shaft on the adjacent side and driven to rotate by a motor, the two chains are respectively sleeved on the outer wall of the sprockets on both sides, and multiple claw frames are fixedly connected to the adjacent side of the chains on both sides for pushing the material receiving frame to move.

[0012] Preferably, the sealed drying low-pressure chamber includes an outer frame fixedly connected to the middle of the top side of the frame. The interior of the outer frame is connected to a sealing shell via a hydraulic cylinder. Six inner sealing covers are fixedly connected inside the sealing shell. A filter screen is installed on the top side of the inner wall of each inner sealing cover and fits into the material receiving frame on the bottom side. Cooling platforms are provided on the bottom sides of two of the material receiving frames to transfer low temperature to the tea leaves inside the material receiving frames and cooperate with two of the inner sealing covers on the top side to perform vacuum low-temperature freezing of the tea leaves. The top of the remaining inner sealing covers is equipped with a microwave generator for microwave sublimation drying of the frozen tea leaves. Both sides of the sealing shell penetrate the outer wall of the outer frame and are rotatably connected to the top of the first connecting rod. The tops of two of the inner sealing covers and the tops of the remaining inner sealing covers are fixedly connected to a connecting pipe. The input end of the connecting pipe is connected to a vacuum pump via a pipe.

[0013] Preferably, the traction unit includes a traction disc rotatably connected inside the rotating frame. Two traction grooves are formed on the top side of the traction disc. One end of the clamping frame is fixedly connected to the traction frame. The bottom side of the traction frame is connected to the traction grooves through a traction protrusion. A rack is connected to the bottom side of the traction disc through tooth meshing. The rack slides horizontally inside the rotating frame, and both ends penetrate the outer wall of the rotating frame. One end of the rack abuts against the top of the push head, and the other end of the rack abuts against one side of the push head.

[0014] Preferably, the lifting assembly includes a lifting platform that slides vertically to the rear end of the frame. The bottom side of the lifting platform is connected to a bottom slide frame via two connecting rods. The bottom slide frame slides horizontally to the bottom side of the frame. The rear side of the bottom slide frame is fixedly connected to the bottom end of the push head, and the front end of the bottom slide frame is rotatably connected to the bottom ends of the two connecting rods.

[0015] Preferably, the rotating assembly includes two gears fixedly connected to the other two ends of the rotating frame, the lifting frame slides vertically at the bottom of the frame, and racks are fixedly connected to both ends of the top side of the lifting frame, the racks meshing with the gears.

[0016] Preferably, the cam triggering unit includes cam three, cam two and cam one, which are fixedly connected to the outer wall of the roller shaft from front to back. The bottom end of the lifting frame is sleeved on the outer wall of the roller shaft and rolls against the outer walls of cam one and cam two through two abutting wheels. The bottom side of the abutting rod rolls against the outer wall of cam three through abutting wheels.

[0017] Preferably, the triggering component includes a support frame, a pusher frame that slides vertically at the top of the support frame, an offset frame that slides horizontally at one end of the support frame, a second pusher head that slides horizontally at the other end of the support frame, and the offset frame and the pusher head that are adjacent to each other connected to the pusher frame via a connecting rod three. The bottom end of the support frame rotates and is connected to a traction lever, which is reset by a torsion spring. One end of the traction lever is fitted onto the top of an abutment rod through a guide groove. The abutment rod slides vertically on the bottom side of the support frame. The other end of the traction lever is connected to the guide groove of the offset frame through a guide protrusion.

[0018] Preferably, the outer periphery of the material receiving frame and the inner wall of the inner sealing cover are both provided with matching corrugated teeth to improve sealing and positioning.

[0019] Preferably, it also includes a discharge port, which is located on one side of the rear end of the frame, and a mounting frame for support is fixedly connected to the top side of the discharge port.

[0020] Working principle: When drying tea leaves, the fermented tea leaves to be dried are placed into the receiving frame and inserted between the claw holders. The sprocket driven by the motor moves the chain, causing the claw holders connected to the chain to move as well, sending the receiving frame into the bottom of the sealing shell. Vacuum cooling and vacuum drying are carried out sequentially inside the sealing shell. As the sealing shell is pressed down by the hydraulic cylinder, the inner sealing cover on its bottom side fits into the receiving frame. The external vacuum pump creates a low-pressure environment in the space between the receiving frame and the inner sealing cover through pipes and connecting pipes.

[0021] The material-bearing frames located on two cooling platforms create a low-temperature environment on their top sides through coolant for heat exchange. The moisture inside the tea leaves inside the two material-bearing frames condenses. Meanwhile, four sealed shells equipped with microwave generators and the material-bearing frames on their bottom sides form a heating and evaporation environment. By moving the material-bearing frames that have completed the condensation step to this location, microwave low-temperature heating and evaporation are performed. The condensed moisture in the tea leaves sublimates rapidly under low pressure, and the water vapor is extracted by the air extraction system connected by the connecting pipe.

[0022] After completing the above steps, the material receiving frame will be moved to the top side of the lifting platform, and then unloading will begin. During the downward movement of the sealing shell, the bottom slide will be pulled by the first connecting rod, causing the bottom slide to move and the rear end of the bottom slide to push the lifting platform on the top side of the second connecting rod through the second connecting rod, and the material receiving frame located on the top side of the lifting platform will be lifted at the same time.

[0023] After the bottom slide is displaced, the push head connected to its rear end is displaced, causing the top of the push head to abut against the rack, and causing the rack to displace and engage the bottom side of the traction disc, thereby causing the traction disc to displace. This causes the traction groove on the traction disc to guide the traction frame connected to the clamping frame to displace, causing the clamping frame to close. After the lifting platform is fully lifted, the clamping frame simultaneously fully clamps the material support frame.

[0024] Subsequently, the roller shaft driven by the motor begins to rotate, causing the cams 1, cam 2 and cam 3 connected to it to rotate. The rotating cams 1 and cam 2 abut against the abutment wheel of the lifting frame through the contour of their surfaces, causing the lifting frame to rise. After the lifting, the rack 2 connected to it is driven to mesh with the gear on the rotating frame, causing the rotating frame and the structure connected to it, including the clamping frame and the material receiving frame, to flip. The speed of the flipping process is moderate to prevent the tea leaves in the material receiving frame from spilling out. When it is flipped 90 degrees, the material receiving frame will be located on the top side of the discharge port, so that the tea leaves will slide down the slope on the rotating frame into the discharge port on the bottom side under the influence of gravity. Finally, the material receiving frame will be flipped 180 degrees simultaneously, so that the material receiving frame is placed on the top side of the placement frame.

[0025] As the material receiving frame is placed on the mounting frame, the protrusion on cam three begins to abut against the abutting wheel on the bottom side of the abutting rod, causing the abutting rod to rise. The rising abutting rod applies force to one end of the traction lever, causing the traction lever to rotate, which in turn pushes the offset frame at the other end. The offset frame pulls one of the connecting rods three to lower the propulsion frame, and pushes the push head two through the other connecting rod three. The push head two pushes the other end of rack one, causing rack one to mesh with the bottom side of the traction disc, causing it to reverse, thus separating the two clamping frames and releasing the clamping of the material receiving frame.

[0026] Finally, the roller shaft, along with cams one, two, and three, rotates in sequence, causing the lifting frame and the contact rod to reset. The sealing shell also resets simultaneously, and the lifting platform resets. The above process is repeated to proceed to the next round of drying and unloading.

[0027] This invention provides a microwave-assisted low-temperature drying device for tea. It has the following beneficial effects:

[0028] 1. Through its integrated continuous operation design, this invention can sequentially complete vacuum freezing and microwave sublimation drying in a sealed low-pressure chamber, followed by automatic lifting, clamping, flipping and unloading of the dried tea leaves, and automatic return of the empty material frame. This significantly reduces labor intensity and ensures the stability and consistency of the production process.

[0029] 2. This invention integrates two key processes, vacuum low-temperature freezing and microwave sublimation drying, into different stations within a sealed housing. After the tea leaves quickly condense moisture in the freezing station, they can be directly transferred to the adjacent microwave drying station for sublimation under vacuum, avoiding potential temperature rises and secondary contamination during intermediate transfer.

[0030] 3. This invention integrates an automated unloading mechanism controlled by a cam-triggered unit, which can automatically complete a series of actions such as lifting, stabilizing, and controlling the speed of flipping and unloading the dried material frame, as well as releasing and recycling the empty frame, which significantly reduces labor intensity and improves discharge efficiency. Attached Figure Description

[0031] Figure 1 This is a perspective view of the present invention;

[0032] Figure 2 This is a schematic diagram of the back-end structure of the present invention;

[0033] Figure 3 This is a schematic diagram showing the position of the material receiving frame of the present invention;

[0034] Figure 4 This is a schematic diagram of the sealing shell of the present invention;

[0035] Figure 5 This is a schematic diagram of the connection structure of the connecting pipe of the present invention;

[0036] Figure 6 This is a schematic diagram of the connection structure of the bottom slide of the present invention;

[0037] Figure 7 This is a schematic diagram of the connection structure of the lifting platform of the present invention;

[0038] Figure 8 This is a schematic diagram showing the position of the clamping frame of the present invention;

[0039] Figure 9 This is a schematic diagram of the connection structure of the rotating frame of the present invention;

[0040] Figure 10 This is a schematic diagram of the internal structure of the rotating frame of the present invention;

[0041] Figure 11 This is a schematic diagram of the connection structure of the roller shaft of the present invention;

[0042] Figure 12 This is a schematic diagram of the traction lever of the present invention.

[0043] The components are as follows: 1. Frame; 2. Sprocket; 3. Chain; 4. Claw holder; 5. Material receiving frame; 6. Outer frame; 7. Sealing shell; 8. Inner sealing cover; 9. Connecting pipe; 10. Bottom slide; 11. Connecting rod one; 12. Connecting rod two; 13. Push head one; 14. Rotating frame; 15. Clamping frame; 16. Traction disc; 17. Traction frame; 18. Rack one; 19. Frame body; 20. Gear; 21. Lifting frame; 22. Roller; 23. Cam one; 24. Cam two; 25. Rack two; 26. Cam three; 27. Support frame; 28. Traction lever; 29. ​​Abutment rod; 30. Pushing frame; 31. Connecting rod three; 32. Offset frame; 33. Push head two; 34. Discharge port; 35. Mounting frame; 36. Lifting platform; 37. Cooling platform. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example:

[0046] This invention provides a microwave-assisted low-temperature drying device for tea, comprising:

[0047] Please see the appendix Figure 1 -Appendix Figure 3 The machine frame 1 has a conveyor unit driven by a motor on its top side that conveys the material frame 5 carrying the tea leaves to be dried. This continuously sends multiple material frames 5 to a sealed low-pressure drying chamber for vacuum low-temperature condensation and microwave drying sublimation to remove moisture from the tea leaves. The conveyor unit includes multiple sprockets 2 and two chains 3 that are rotatably connected to the front and rear ends of the machine frame 1. The sprockets 2 on the left and right ends are connected to each other by a shaft and driven by a motor. The two chains 3 are respectively sleeved on the outer wall of the sprockets 2 on both sides. Multiple claw frames 4 are fixedly connected to each other on the side of the chains 3 on both sides to push the material frame 5 to move. The machine frame 1 also includes a discharge port 34 located on the rear end side of the machine frame 1. The top side of the discharge port 34 is fixedly connected to a support frame 35.

[0048] Specifically, during the drying of tea leaves, the fermented tea leaves to be dried are placed into the receiving frame 5 and inserted between the claw holders 4. The sprocket 2 driven by the motor pulls the chain 3 to move, causing the claw holders 4 connected to the chain 3 to move as well, sending the receiving frame 5 into the bottom of the sealing shell 7. Vacuum cooling and vacuum drying are carried out sequentially inside the sealing shell 7. As the sealing shell 7 is pressed down by the hydraulic cylinder, the inner sealing cover 8 on its bottom side fits into the receiving frame 5. The external vacuum pump creates a low-pressure environment in the space between the receiving frame 5 and the inner sealing cover 8 through the pipes and connecting pipes 9.

[0049] Please see the appendix Figure 3 -Appendix Figure 5 The sealed drying low-pressure chamber includes an outer frame 6 fixedly connected to the middle of the top side of the frame 1. A sealing shell 7 is connected to the inside of the outer frame 6 via a hydraulic cylinder. Six inner sealing covers 8 are fixedly connected inside the sealing shell 7. Standardized sealing devices are provided on the edges of both the sealing shell 7 and the inner sealing covers 8 to ensure a perfect low-pressure environment. A filter screen is installed on the top side of the inner wall of each inner sealing cover 8, and it fits into the bottom material receiving frame 5. Two of the material receiving frames 5 have cooling platforms 37 on their bottom sides to transfer the low temperature to the tea leaves inside the material receiving frame 5, and to cooperate with the two inner sealing covers on the top side. The sealing cover 8 performs vacuum low-temperature freezing of the tea leaves. The top of the remaining inner sealing cover 8 is equipped with a microwave generator for microwave sublimation drying of the frozen tea leaves. Both sides of the sealing shell 7 penetrate the outer wall of the outer frame 6 and are rotatably connected to the top of the connecting rod 11. The tops of the two inner sealing covers 8 and the top of the remaining inner sealing cover 8 are fixedly connected to the connecting pipe 9. The input end of the connecting pipe 9 is connected to a vacuum pump through a pipe. The outer periphery of the material receiving frame 5 and the inner wall of the inner sealing cover 8 are provided with matching corrugated teeth to improve sealing and positioning.

[0050] Specifically, the material-bearing frames 5 located on the two cooling platforms 37 are cooled by a coolant to create a low-temperature environment on their top side for heat exchange. The moisture inside the tea leaves inside the two material-bearing frames 5 condenses. Meanwhile, the four sealed shells 7 equipped with microwave generators and the material-bearing frames 5 on their bottom sides form a heating and evaporation environment. After the material-bearing frames 5 that have completed the condensation step are moved to this location, microwave low-temperature heating and evaporation are performed. The condensed moisture in the tea leaves sublimates rapidly under low pressure, and the water vapor is extracted by the air extraction system connected by the connecting pipe 9.

[0051] Please see the appendix Figure 6 -Appendix Figure 8The frame 19 is located at the rear end of the frame 1. The top of the frame 19 is rotatably connected to the rotating frame 14. One side of the rotating frame 14 is connected to two clamping frames 15 through the traction unit to clamp the material frame 5 containing dried tea leaves. The lifting component cooperates to lift the material frame 5 and triggers the traction unit to clamp it through the push head 13. The lifting component is connected to the sealed drying low-pressure chamber through the connecting rod 11. The lifting component includes a lifting platform 36 that slides vertically at the rear end of the frame 1. The bottom side of the lifting platform 36 is connected to the bottom slide 10 through two connecting rods 12. The bottom slide 10 slides horizontally on the bottom side of the frame 1. The rear side of the bottom slide 10 is fixedly connected to the bottom end of the push head 13, and the front end of the bottom slide 10 is rotatably connected to the bottom end of the two connecting rods 11.

[0052] Specifically, when unloading begins, during the downward displacement of the sealing shell 7, the bottom slide 10 on the bottom side will be pulled by the connecting rod 11, causing the bottom slide 10 to shift. The rear end of the bottom slide 10 will push the lifting platform 36 on the top side of the connecting rod 212, and the material receiving frame 5 located on the top side of the lifting platform 36 will be lifted simultaneously.

[0053] Please see the appendix Figure 8 -Appendix Figure 10 The traction unit includes a traction disc 16 rotatably connected inside the rotating frame 14. Two traction slots are opened on the top side of the traction disc 16. One end of the clamping frame 15 is fixedly connected to the traction frame 17. The bottom side of the traction frame 17 is connected to the traction slots through traction protrusions. The bottom side of the traction disc 16 is connected to a rack 18 through tooth meshing. The rack 18 slides horizontally inside the rotating frame 14, and both ends penetrate the outer wall of the rotating frame 14. One end of the rack 18 abuts against the top of the push head 13, and the other end of the rack 18 abuts against one side of the push head 33.

[0054] Specifically, after the displacement of the bottom slide 10, the push head 13 connected to its rear end also displaces, causing the top of the push head 13 to abut against the rack 18, and causing the rack 18 to displace and engage the bottom side of the traction disc 16, thereby causing the traction disc 16 to displace. This causes the traction groove on the traction disc 16 to guide the traction frame 17 connected to the clamping frame 15 to displace, causing the clamping frame 15 to close. After the lifting platform 36 is fully lifted, the clamping frame 15 simultaneously fully clamps the material frame 5. After the push head 33 pushes the other end of the rack 18, the rack 18 will engage the bottom side of the traction disc 16, causing it to reverse and the two clamping frames 15 to separate, thereby releasing the clamping of the material frame 5.

[0055] Please see the appendix Figure 8 Appendix Figure 11 and attached Figure 12The roller 22 is driven by a motor to rotate. A cam trigger unit is installed on the roller 22. One end of the cam trigger unit is connected to a rotating component via a lifting frame 21 to rotate and flip the rotating frame 14, allowing for one-button unloading of the dried tea leaves. The other end of the cam trigger unit is connected to a trigger component via an abutment rod 29. After unloading, the trigger unit uses a trigger-connected push head 33 to abut against the traction unit, releasing the material support frame 5 and removing it. The rotating component includes two gears 20 fixedly connected to both ends of the other side of the rotating frame 14. The lifting frame 21 slides vertically at the bottom of the frame 19, and racks 25 are fixedly connected to both ends of the top side of the lifting frame 21, meshing with the gears 20. The cam trigger unit includes cams 26, 24, and 23, which are sequentially fixedly connected to the outer wall of the roller 22 from front to back. The bottom end of the lifting frame 21 is sleeved on the outer wall of the roller 22 and rolls against the outer walls of the first cam 23 and the second cam 24 through two abutting wheels. The bottom side of the abutting rod 29 rolls against the outer wall of the third cam 26 through the abutting wheel. The triggering component includes a support frame 27. The top end of the support frame 27 has a vertically sliding push frame 30. One end of the support frame 27 has a horizontally sliding offset frame 32. The second push head 33 slides horizontally at the other end of the support frame 27. The adjacent sides of the offset frame 32 and the second push head 33 are connected to the push frame 30 through the connecting rod 31. The bottom end of the support frame 27 rotates and is connected to a traction lever 28, which is reset by a torsion spring. One end of the traction lever 28 is sleeved on the top end of the abutting rod 29 through a guide groove. The abutting rod 29 slides vertically on the bottom side of the support frame 27. The other end of the traction lever 28 is connected to the guide groove of the offset frame 32 through a guide protrusion.

[0056] Specifically, the roller 22 driven by the motor starts to rotate, causing the cams 23, 24, and 26 connected to it to rotate as well. The rotating cams 23 and 24 abut against the abutment wheel of the lifting frame 21 through their surface contours, causing the lifting frame 21 to rise. After rising, the rack 25 connected to it is driven to mesh with the gear 20 on the rotating frame 14, causing the rotating frame 14 and its connected structure, including the clamping frame 15, to flip over with the material receiving frame 5. The speed of the flipping process is moderate to prevent the tea leaves in the material receiving frame 5 from spilling out. When it is flipped 90 degrees, the material receiving frame 5 will be located on the top side of the discharge port 34, so that the tea leaves are subjected to gravity. The material slides down the ramp on the rotating frame 14 into the bottom feed port 34. Finally, the material receiving frame 5 will be rotated 180 degrees, so that the material receiving frame 5 is placed on the top side of the mounting frame 35. At the same time as the material receiving frame 5 is placed on the mounting frame 35, the protrusion on the cam 26 begins to abut against the abutting wheel on the bottom side of the abutting rod 29, causing the abutting rod 29 to rise. The rising abutting rod 29 applies force to one end of the traction lever 28, causing the traction lever 28 to rotate, so that its other end pushes the offset frame 32. The offset frame 32 pulls one of the connecting rods 31 to lower the push frame 30, and pushes the push head 33 through the other connecting rod 31, causing the push head 33 to push the other end of the rack 18.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A microwave-assisted low-temperature drying device for tea, characterized in that, include: The top side of the frame (1) is conveyed by a conveyor unit driven by a motor to transport the material frame (5) carrying the tea leaves to be dried, so as to continuously send multiple material frames (5) to the sealed drying low-pressure chamber for vacuum low-temperature condensation and microwave drying sublimation in sequence to remove the moisture in the tea leaves. The frame (19) is located at the rear end of the frame (1). The top of the frame (19) is rotatably connected to a rotating frame (14). One side of the rotating frame (14) is connected to two clamping frames (15) through a traction unit to clamp the material frame (5) containing dried tea leaves. The lifting assembly cooperates to lift the material frame (5) and triggers the traction unit to clamp it through a push head (13). The lifting assembly is connected to the sealed drying low-pressure chamber through a connecting rod (11). Roller (22), the roller (22) is driven to rotate by a motor. The roller (22) is equipped with a cam trigger unit. One end of the cam trigger unit is connected to a rotating component through a lifting frame (21) to rotate and flip the rotating frame (14) to unload the dried tea leaves with one click. The other end of the cam trigger unit is connected to a trigger component through a contact rod (29) so that after unloading, the trigger unit will contact the traction unit through the push head two (33) connected to the trigger to release the material frame (5) and remove the material frame (5) together.

2. The microwave-assisted low-temperature drying device for tea according to claim 1, characterized in that, The conveyor unit includes multiple sprockets (2) and two chains (3) rotatably connected to the front and rear ends of the frame (1). The sprockets (2) at the left and right ends are connected by a rotating shaft on the side closest to each other and are driven to rotate by a motor. The two chains (3) are respectively sleeved on the outer wall of the sprockets (2) on both sides. Multiple claw frames (4) are fixedly connected to the side closest to each other on both sides of the chains (3) to push the material frame (5) to move.

3. The microwave-assisted low-temperature drying device for tea according to claim 1, characterized in that, The sealed drying low-pressure chamber includes an outer frame (6) fixedly connected to the middle of the top side of the frame (1). The interior of the outer frame (6) is connected to a sealing shell (7) via a hydraulic cylinder. The interior of the sealing shell (7) is fixedly connected to six inner sealing covers (8). The top side of the inner wall of each inner sealing cover (8) is equipped with a filter screen and fits into the bottom support frame (5). Two of the support frames (5) are provided with cooling platforms (37) on their bottom sides to transfer the low temperature to the tea leaves inside the support frame (5) and cooperate with the top side of one of them. Two inner sealing covers (8) are used for vacuum low-temperature freezing of tea leaves. The top of the remaining inner sealing cover (8) is equipped with a microwave generator for microwave sublimation drying of the frozen tea leaves. Both sides of the sealing shell (7) penetrate the outer wall of the outer frame (6) and are rotatably connected to the top of the connecting rod (11). The top of the two inner sealing covers (8) and the top of the remaining inner sealing cover (8) are fixedly connected to a connecting pipe (9). The input end of the connecting pipe (9) is connected to a vacuum pump through a pipe.

4. The microwave-assisted low-temperature drying device for tea according to claim 1, characterized in that, The traction unit includes a traction disc (16) rotatably connected inside the rotating frame (14). Two traction slots are provided on the top side of the traction disc (16). One end of the clamping frame (15) is fixedly connected to a traction frame (17). The bottom side of the traction frame (17) is connected to the traction slots through a traction protrusion. The bottom side of the traction disc (16) is connected to a rack (18) through tooth meshing. The rack (18) slides horizontally inside the rotating frame (14), and both ends penetrate the outer wall of the rotating frame (14). One end of the rack (18) abuts against the top of the push head (13), and the other end of the rack (18) abuts against one side of the push head (33).

5. The microwave-assisted low-temperature drying device for tea according to claim 1, characterized in that, The lifting assembly includes a lifting platform (36) that slides vertically at the rear end of the frame (1). The bottom side of the lifting platform (36) is connected to a bottom slide (10) via two connecting rods (12). The bottom slide (10) slides horizontally at the bottom side of the frame (1). The rear side of the bottom slide (10) is fixedly connected to the bottom end of the push head (13). The front end of the bottom slide (10) is rotatably connected to the bottom ends of the two connecting rods (11).

6. The microwave-assisted low-temperature drying device for tea according to claim 1, characterized in that, The rotating assembly includes two gears (20) fixedly connected to the other two ends of the rotating frame (14). The lifting frame (21) slides vertically at the bottom end of the frame (19), and racks (25) are fixedly connected to both ends of the top side of the lifting frame (21). The racks (25) mesh with the gears (20).

7. The microwave-assisted low-temperature drying device for tea according to claim 1, characterized in that, The cam trigger unit includes cam three (26), cam two (24) and cam one (23) which are fixedly connected to the outer wall of the roller shaft (22) from front to back. The bottom end of the lifting frame (21) is sleeved on the outer wall of the roller shaft (22) and rolls against the outer wall of cam one (23) and cam two (24) through two abutting wheels. The bottom side of the abutting rod (29) rolls against the outer wall of cam three (26) through the abutting wheel.

8. The microwave-assisted low-temperature drying device for tea according to claim 1, characterized in that, The triggering component includes a support frame (27), a pusher frame (30) that slides vertically at the top of the support frame (27), an offset frame (32) that slides horizontally at one end of the support frame (27), a pusher head (33) that slides horizontally at the other end of the support frame (27), and the offset frame (32) and the pusher head (33) that are close to each other are connected to the pusher frame (30) via a connecting rod (31). The bottom end of the support frame (27) rotates and is connected to a traction lever (28), which is reset by a torsion spring. One end of the traction lever (28) is sleeved on the top of the abutment rod (29) through a guide groove. The abutment rod (29) slides vertically on the bottom side of the support frame (27). The other end of the traction lever (28) is connected to the guide groove of the offset frame (32) through a guide protrusion.

9. The microwave-assisted low-temperature drying device for tea according to claim 3, characterized in that, The outer periphery of the material receiving frame (5) and the inner wall of the inner sealing cover (8) are both provided with matching wave teeth to improve sealing and positioning.

10. A microwave-assisted low-temperature drying device for tea according to claim 1, characterized in that, It also includes a discharge port (34), which is located on one side of the rear end of the frame (1), and a mounting frame (35) for support is fixedly connected to the top side of the discharge port (34).

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