Pretreatment device suitable for extracting theaflavin from tea leaves

Abstract

The invention relates to the technical field of tea leaf processing, and discloses a pretreatment device suitable for extracting theaflavin in tea leaves, the pretreatment device comprises a fixing frame, the upper part of the fixing frame is fixedly connected with a mounting frame plate, and the interior of the mounting frame plate is fixedly connected with a mounting inner ring and a mounting outer ring; and the screen inner barrel is fixedly connected to the inner surface of the circumference of the mounting inner ring, the inner surface of the circumference of the mounting outer ring is rotationally connected with a screen outer barrel, the upper portion of the screen inner barrel fixedly communicates with a feeding box, and the two opposite sides of the interior of the mounting frame plate are rotationally connected with rotating rod sets. The pretreatment device for extracting theaflavin can effectively solve the problems that in the prior art, large tea leaves are difficult to completely crush by crushing blades, the tea leaves which are not completely crushed cannot penetrate through screen holes of a screen and are accumulated on the screen, the screen holes of the screen are blocked by the tea leaves, and the screening efficiency of the screen is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of tea processing, and in particular to a pretreatment device suitable for extracting theaflavins from tea. Background Art

[0002] Theaflavins, also known as thea yellow pigment, are a golden pigment found in black tea. They have various health benefits, such as antioxidant and anti-inflammatory properties. In the process of extracting theaflavins from tea leaves, high-quality tea leaves are usually selected, crushed and sieved to obtain tea powder with uniform particle size, thereby increasing the surface area of the tea leaves and increasing the contact area with the extraction solvent, thereby improving the extraction efficiency of theaflavins.

[0003] At present, in the process of crushing batches of tea, some tea leaves are large in size, and the crushing blades are difficult to completely crush the large pieces of tea leaves. The incompletely crushed tea leaves cannot pass through the sieve holes of the screen and accumulate on the screen, causing some tea leaves to block the sieve holes of the screen, thereby reducing the screening efficiency of the screen. Summary of the Invention

[0004] Technical problems solved

[0005] In response to the above-mentioned shortcomings of the prior art, the present invention provides a pretreatment device suitable for the extraction of theaflavins from tea leaves, which can effectively solve the problem in the prior art that the crushing blades are difficult to completely crush large pieces of tea leaves, and the incompletely crushed tea leaves cannot pass through the sieve holes of the screen and accumulate on the screen, causing the tea leaves to block the sieve holes of the screen and reduce the screening efficiency of the screen.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The present invention provides a pretreatment device suitable for extracting theaflavins from tea leaves, comprising:

[0009] A fixing frame, wherein the upper portion of the fixing frame is fixedly connected to a mounting frame plate, and the interior of the mounting frame plate is fixedly connected to a mounting inner ring and a mounting outer ring;

[0010] The screen inner cylinder is fixedly connected to the inner circumferential surface of the mounting inner ring, the screen outer cylinder is rotatably connected to the inner circumferential surface of the mounting outer ring, the upper part of the screen inner cylinder is fixedly connected to the feed box, the opposite sides of the mounting frame plate are rotatably connected to the rotating rod group, the outer circumferential surface of the rotating rod group is rotatably connected to the partition, the feed plate is fixedly connected between the partition and the feed box, and the side of the screen outer cylinder away from the screen inner cylinder is fixedly connected to the sealing plate;

[0011] In which, when the screen outer cylinder and the rotating rod group rotate inside the mounting frame, the rotating rod group crushes the tea leaves by means of the crushing blades arranged on the outer circumferential surface thereof, and the sealing plate transfers the tea leaves that are not completely crushed inside the screen inner cylinder and the screen outer cylinder to the interior of the feed box again by means of the material transfer part arranged on one side thereof, so as to crush the tea leaves that are not completely crushed again.

[0012] Furthermore, the rotating rod group includes a rotating rod, a pinion is fixedly connected to the circumferential outer surface of the rotating rod, two rotating rods are provided and are symmetrically distributed with the axis of the inner tube of the screen as the center, and the two rotating rods are meshed with each other through the pinion.

[0013] Furthermore, a discharge port is provided at the lower portion of the partition, and a return port is provided at the upper portion of the partition.

[0014] Furthermore, one end of the feeding plate away from the feeding box passes through the return port and is fixedly connected to a feeding support plate.

[0015] Furthermore, a plurality of material transfer parts distributed in a circumferential array are provided on one side of the sealing plate close to the partition plate, and a sealing sheet is fixedly connected between two adjacent material transfer parts;

[0016] The material moving part includes a fixed folding plate and a rotating folding plate, wherein the fixed folding plate is fixedly connected to the side of the sealing plate close to the partition, and the rotating folding plate is rotatably connected to the side of the sealing plate close to the partition through a shaft.

[0017] Furthermore, a special-shaped slide rail is provided on the side of the partition close to the sealing plate, and the special-shaped slide rail includes a first track, a second track and a third track connected end to end. A sliding rod is rotatably connected to the side of the rotating folding plate away from the sealing plate, and the rotating folding plate is slidably connected to the special-shaped slide rail through the sliding rod.

[0018] In which, when the rotating folding plate is slidably connected to the first track through the sliding rod, the rotating folding plate and the fixed folding plate are in a fitted and closed state; when the rotating folding plate is slidably connected to the second track through the sliding rod, the rotating folding plate rotates around the axis of the shaft so that the rotating folding plate and the fixed folding plate are in a separated and open state; when the rotating folding plate is slidably connected to the third track through the sliding rod, the inclination angle of the rotating end of the rotating folding plate remains unchanged.

[0019] Furthermore, a lower hopper is fixedly connected to the bottom of the mounting frame, and a collecting box is provided below the lower hopper.

[0020] Furthermore, a driving motor is fixedly connected to one side of the fixed frame, a driving rod is rotatably connected to the inner wall of the mounting frame, the output end of the driving motor is fixedly connected to the driving rod, a large gear is fixedly connected to the circumferential outer surface of the driving rod, a large gear ring is fixedly connected to the circumferential outer surface of the screen outer cylinder, the large gear is meshed with the large gear ring, and a transmission belt is connected to the transmission sleeve between the driving rod and the rotating rod group.

[0021] Beneficial effects

[0022] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0023] The present invention is provided with a material moving part, which drives the rotating rod group and the screen outer cylinder to rotate by controlling the driving motor, and the rotating rod group drives the two groups of crushing blades to rotate to crush the tea leaves, and the completely crushed tea leaves pass through the sieve holes of the screen inner cylinder and the screen outer cylinder and fall into the inside of the collection box, and the incompletely crushed tea leaves move along the inner walls of the screen inner cylinder and the screen outer cylinder toward the discharge port and enter the inside of the material moving part through the discharge port, and the screen outer cylinder drives the material moving part to rotate upward through the sealing plate, and the material moving part drives the incompletely crushed tea leaves to move upward to the top of the feeding support plate, and under the limiting action of the special-shaped slide rail, the rotating folding plate moves around The shaft rotates a certain angle (the material transfer part is in the open state), and the incompletely crushed tea leaves fall down onto the feeding support plate, and the incompletely crushed tea leaves move again to the inside of the feed box through the feeding support plate, the return port and the feeding plate, and the two sets of crushing blades crush the incompletely crushed tea leaves again. The incompletely crushed tea leaves are crushed multiple times by the crushing blades until all the tea leaves are completely crushed, preventing the incompletely crushed tea leaves from accumulating inside the inner and outer cylinders of the screen, thereby unblocking the sieve holes of the inner and outer cylinders of the screen, and thereby improving the screening efficiency of the inner and outer cylinders of the screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0025] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention;

[0026] Figure 2 This is an exploded schematic diagram of installing a frame plate according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic structural diagram of a crushing blade according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic structural diagram of a feeding plate according to an embodiment of the present invention;

[0029] Figure 5 This is a structural diagram of a feeding support plate according to an embodiment of the present invention;

[0030] Figure 6 This is a structural diagram of a fixed folding plate according to an embodiment of the present invention;

[0031] Figure 7 This is an exploded schematic diagram of a partition according to an embodiment of the present invention;

[0032] Figure 8 It is a right side structural schematic diagram of the special-shaped slide rail according to an embodiment of the present invention.

[0033] The numbers in the figure represent:

[0034] 1. Fix the frame; 11. Install the frame; 12. Install the inner ring; 13. Install the outer ring;

[0035] 2. Screen inner cylinder; 20. Screen outer cylinder; 21. Feed box;

[0036] 22. Rotating rod assembly; 221. Crushing blade; 222. Pinion gear;

[0037] 23. Partition plate; 231. Discharge port; 232. Return port;

[0038] 24. Feeding plate; 241. Feeding support plate;

[0039] 25. Seal the plate; 251. Seal the slide;

[0040] 252. Material transfer part; 2521. Fixed folding plate;

[0041] 2522, rotating folding plate; 25221, shaft; 25222, sliding rod;

[0042] 2523, special-shaped slide rail; 25231, first rail; 25232, second rail; 25233, third rail;

[0043] 26. lower hopper; 261. collection box;

[0044] 3. Drive motor; 31. Drive rod; 32. Large gear; 321. Large ring gear; 33. Drive belt. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] The present invention will be further described below with reference to the embodiments.

[0047] Example:

[0048] See also Figures 1-8 The present invention provides a technical solution: a pretreatment device suitable for extracting theaflavins from tea leaves, comprising:

[0049] A fixing frame 1, the upper portion of which is fixedly connected to a mounting frame plate 11, and an inner mounting ring 12 and an outer mounting ring 13 are fixedly connected to the interior of the mounting frame plate 11;

[0050] The screen inner cylinder 2 is fixedly connected to the inner surface of the circumference of the mounting inner ring 12, and the screen outer cylinder 20 is rotatably connected to the inner surface of the circumference of the mounting outer ring 13. The upper part of the screen inner cylinder 2 is fixedly connected to the feed box 21, and the opposite sides of the mounting frame 11 are rotatably connected to the rotating rod group 22. The circumferential outer surface of the rotating rod group 22 is rotatably connected to the partition 23. A feeding plate 24 is fixedly connected between the partition 23 and the feed box 21. A sealing plate 25 is fixedly connected to the side of the screen outer cylinder 20 away from the screen inner cylinder 2;

[0051] In which, during the rotation of the screen outer cylinder 20 and the rotating rod group 22 inside the mounting frame plate 11, the rotating rod group 22 crushes the tea leaves by means of the crushing blades 221 arranged on its circumferential outer surface, and the sealing plate 25 transfers the tea leaves that are not completely crushed inside the screen inner cylinder 2 and the screen outer cylinder 20 to the inside of the feed box 21 again by means of the material transfer part 252 arranged on one side thereof, so as to crush the tea leaves that are not completely crushed again.

[0052] The rotating rod group 22 includes a rotating rod, and a small gear 222 is fixedly connected to the circumferential outer surface of the rotating rod. There are two rotating rods and they are symmetrically distributed around the axis of the screen inner tube 2. The two rotating rods are meshed through the small gear 222.

[0053] A discharge port 231 is formed at the bottom of the partition plate 23 , and a return port 232 is formed at the top of the partition plate 23 .

[0054] Under the action of gravity, the incompletely crushed tea leaves move along the screen inner cylinder 2 and the screen outer cylinder 20 toward the partition 23 , and the incompletely crushed tea leaves enter between the partition 23 and the sealing plate 25 through the discharge port 231 at the lower part of the partition 23 .

[0055] One end of the feeding plate 24 away from the feeding box 21 passes through the return opening 232 and is fixedly connected to a feeding support plate 241 .

[0056] Under the action of gravity, the tea leaves on the feeding support plate 241 move toward the bottom end of the feeding plate 24 through the return port 232 until the tea leaves that are not completely crushed enter the interior of the feeding box 21 again.

[0057] A plurality of material transfer portions 252 are provided on one side of the sealing plate 25 close to the partition plate 23 and arranged in a circumferential array. A sealing sheet 251 is fixedly connected between two adjacent material transfer portions 252.

[0058] Among them, the material moving part 252 includes a fixed folding plate 2521 and a rotating folding plate 2522. The fixed folding plate 2521 is fixedly connected to the side of the sealing plate 25 close to the partition 23, and the rotating folding plate 2522 is rotatably connected to the side of the sealing plate 25 close to the partition 23 through the shaft 25221.

[0059] During the process of the sealing plate 25 rotating inside the mounting frame 11, the sealing plate 25 drives the multiple material moving parts 252 and the multiple sealing pieces 251 to rotate synchronously, so that the material moving parts 252 and the sealing pieces 251 are alternately aligned with the discharge port 231. During the process of the material moving parts 252 being aligned with the discharge port 231, the tea leaves that are not completely crushed enter the interior of the material moving parts 252 through the discharge port 231. During the process of the sealing pieces 251 being aligned with the discharge port 231, the tea leaves are prevented from entering between the two adjacent material moving parts 252 through the discharge port 231 due to the obstruction of the sealing pieces 251.

[0060] A special-shaped slide rail 2523 is provided on the side of the partition 23 close to the closing plate 25. The special-shaped slide rail 2523 includes a first track 25231, a second track 25232, and a third track 25233 connected end to end. A sliding rod 25222 is rotatably connected to the side of the rotating folding plate 2522 away from the closing plate 25. The rotating folding plate 2522 is slidably connected to the special-shaped slide rail 2523 via the sliding rod 25222.

[0061] Among them, when the rotating fold plate 2522 is slidably connected to the first track 25231 through the sliding rod 25222, the rotating fold plate 2522 and the fixed fold plate 2521 are in a fitted and closed state. When the rotating fold plate 2522 is slidably connected to the second track 25232 through the sliding rod 25222, the rotating fold plate 2522 rotates around the axis of the shaft 25221 so that the rotating fold plate 2522 and the fixed fold plate 2521 are in a separated and open state. When the rotating fold plate 2522 is slidably connected to the third track 25233 through the sliding rod 25222, the inclination angle of the rotating end of the rotating fold plate 2522 remains unchanged.

[0062] A lower hopper 26 is fixedly connected to the bottom of the mounting frame 11 , and a collecting box 261 is provided below the lower hopper 26 .

[0063] A driving motor 3 is fixedly connected to one side of the fixed frame 1, and a driving rod 31 is rotatably connected to the inner wall of the mounting frame plate 11. The output end of the driving motor 3 is fixedly connected to the driving rod 31, and a large gear 32 is fixedly connected to the circumferential outer surface of the driving rod 31. A large gear ring 321 is fixedly connected to the circumferential outer surface of the screen outer cylinder 20. The large gear 32 is meshed with the large gear ring 321, and a transmission belt 33 is connected between the driving rod 31 and the rotating rod group 22.

[0064] The initial crushing process of tea leaves:

[0065] In actual application, by starting the driving motor 3, the driving motor 3 drives the driving rod 31 to rotate on the mounting frame 11 through the output end. Under the transmission action of the transmission belt 33, the transmission belt 33 drives one of the rotating rods in the rotating rod group 22 to rotate. Under the meshing action of the pinion 222, the rotating rotating rod drives the other rotating rod in the rotating rod group 22 to rotate in the opposite direction. The two rotating rods with opposite rotation directions drive the crushing blades 221 on their circumferential outer surfaces to rotate. Under the rotation action of the two groups of crushing blades 221, the tea leaves moving downward through the feed box 21 pass between the two groups of crushing blades 221. The two groups of rotating crushing blades 221 crush the tea leaves. The crushed tea leaves continue to fall downward into the inside of the screen inner cylinder 2 and the screen outer cylinder 20, so that the completely crushed tea leaves fall downward into the inside of the lower hopper 26 through the sieve holes on the screen inner cylinder 2 and the screen outer cylinder 20, and the completely crushed tea leaves continue to move along the lower hopper 26 to the inside of the collecting box 261, completing the unified collection of tea powder.

[0066] The re-crushing process of tea leaves:

[0067] In actual application, under the action of gravity, the incompletely crushed tea leaves move toward the partition 23 along the inner walls of the screen inner cylinder 2 and the screen outer cylinder 20, and the incompletely crushed tea leaves enter the interior of the material transfer portion 252 through the discharge port 231. During the rotation of the driving rod 31, the driving rod 31 drives the large gear 32 on its circumferential outer surface to rotate synchronously. Under the meshing action of the large gear 32 and the large gear ring 321, the rotating large gear 32 drives the screen outer cylinder 20 to rotate around the axis of the outer ring 13 through the large gear ring 321, and the screen outer cylinder 20 drives the sealing plate 25 on its inner surface to rotate synchronously. The sealing plate 25 drives the material moving part 252 and the sealing piece 251 on one side to rotate synchronously. The material moving part 252 at the bottom drives the unground tea leaves inside it to move upward. In the process of the sealing plate 25 driving the rotating folding plate 2522 to move upward through the shaft 25221, the rotating folding plate 2522 drives the sliding rod 25222 on one side to slide upward along the first track 25231. Under the limiting action of the first track 25231, the rotating folding plate 2522 always keeps in contact with the fixed folding plate 2521 (the material moving part 252 is in a closed state), preventing the tea leaves from moving upward. The interior of the material moving part 252 overflows, and the sealing plate 25 drives the sliding rod 25222 to slide along the second track 25232 through the shaft rod 25221 and the rotating folding plate 2522. At this time, the material moving part 252 is located above the feeding support plate 241. Under the limiting action of the second track 25232, the rotating folding plate 2522 rotates downward around the axis of the shaft rod 25221, and the rotating folding plate 2522 gradually moves away from the fixed folding plate 2521 (the material moving part 252 is in the open state), so that the tea leaves that are not completely crushed in the material moving part 252 fall downward along the rotating folding plate 2522 onto the feeding support plate On the material support plate 241, under the action of gravity, the incompletely crushed tea leaves on the feed support plate 241 move toward the feed plate 24 through the return port 232. Under the feeding action of the feed plate 24, the incompletely crushed tea leaves move downward along the feed plate 24, and the incompletely crushed tea leaves enter the interior of the feed box 21 again, so that the incompletely crushed tea leaves pass through the two groups of crushing blades 221 again. The two groups of crushing blades 221 crush the incompletely crushed tea leaves again, and the crushing blades 221 crush the incompletely crushed tea leaves multiple times until all the tea leaves are completely crushed.

[0068] Resetting process of the material transfer unit 252:

[0069] In actual application, after the incompletely crushed tea leaves fall from the material transfer portion 252 onto the feeding support plate 241, the sealing plate 25 drives the slide bar 25222 to slide along the third track 25233 through the shaft rod 25221 and the rotating folding plate 2522. Since the trajectory of the third track 25233 is relatively consistent with the movement trajectory of the shaft rod 25221, the inclination angle of the rotating end of the rotating folding plate 2522 is fixed. After the slide bar 25222 is slidably connected to the first track 25231 along the third track 25233, under the limiting action of the first track 25231, the rotating folding plate 2522 is again kept in contact with the fixed folding plate 2521 (the material transfer portion 252 is in a closed state), thereby facilitating the material transfer portion 252 to take the incompletely crushed tea leaves through the discharge port 231 again.

[0070] In summary, the present application has the following advantages by adopting the material transfer unit 252:

[0071] Advantage 1: by controlling the two groups of crushing blades 221 to rotate continuously inside the screen inner cylinder 2, the two groups of rotating crushing blades 221 crush the tea leaves passing between the two groups of crushing blades 221, so that the completely crushed tea leaves pass through the sieve holes of the screen inner cylinder 2 and the screen outer cylinder 20 and fall downward into the inside of the collection box 261, completing the unified collection of tea powder.

[0072] Advantage 2: the incompletely crushed tea leaves enter the interior of the material transfer part 252 through the discharge port 231. When the sealing plate 25 drives the material transfer part 252 to rotate upward, the material transfer part 252 drives the incompletely crushed tea leaves inside it to move to the top of the feeding support plate 241 and feeds the feeding support plate 241, so that the incompletely crushed tea leaves return to the interior of the feed box 21 again through the feeding support plate 241, the return port 232 and the feeding plate 24, and the two groups of crushing blades 221 crush the incompletely crushed tea leaves again. The crushing blades 221 crush the incompletely crushed tea leaves for multiple times until all the tea leaves are completely crushed, preventing the incompletely crushed tea leaves from accumulating inside the inner and outer screen cylinders 2 and 20, thereby unblocking the sieve holes of the inner and outer screen cylinders 2 and 20, and thereby improving the screening efficiency of the inner and outer screen cylinders 2 and 20.

[0073] Advantage three: by controlling the screen outer cylinder 20 to continuously rotate around the axis of the outer ring 13, the movement effect of the tea leaves in the screen outer cylinder 20 is enhanced, thereby accelerating the speed of the incompletely crushed tea leaves moving toward the discharge port 231.

[0074] Advantage four: by setting the special-shaped slide rail 2523, when the material moving part 252 rotates between the partition 23 and the sealing plate 25, under the limiting action of the first track 25231, the material moving part 252 is in a closed state; under the limiting action of the second track 25232, the material moving part 252 is in an open state; under the coordinated action of the third track 25233 and the first track 25231, the material moving part 252 is in a closed state again, thereby automatically completing the material picking and discharging of the material moving part 252.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A pretreatment device suitable for extracting theaflavins from tea leaves, characterized in that: include: A fixing frame (1), wherein the upper portion of the fixing frame (1) is fixedly connected to a mounting frame plate (11), and the interior of the mounting frame plate (11) is fixedly connected to a mounting inner ring (12) and a mounting outer ring (13); A screen inner cylinder (2), the screen inner cylinder (2) is fixedly connected to the inner circumferential surface of the mounting inner ring (12), the screen outer cylinder (20) is rotatably connected to the inner circumferential surface of the mounting outer ring (13), the upper part of the screen inner cylinder (2) is fixedly connected to a feed box (21), the opposite sides of the interior of the mounting frame plate (11) are rotatably connected to a rotating rod group (22), a partition (23) is rotatably connected to the outer circumferential surface of the rotating rod group (22), a feeding plate (24) is fixedly connected between the partition (23) and the feed box (21), and a sealing plate (25) is fixedly connected to the side of the screen outer cylinder (20) away from the screen inner cylinder (2); In the process of the screen outer cylinder (20) and the rotating rod group (22) rotating inside the mounting frame (11), the rotating rod group (22) crushes the tea leaves by means of the crushing blades (221) arranged on the outer circumferential surface thereof, and the sealing plate (25) transfers the tea leaves that are not completely crushed inside the screen inner cylinder (2) and the screen outer cylinder (20) to the inside of the feed box (21) again by means of the material transfer portion (252) arranged on one side thereof, so as to crush the tea leaves that are not completely crushed again.

2. A pretreatment device for extracting theaflavins from tea leaves according to claim 1, characterized in that: The rotating rod group (22) comprises a rotating rod, a pinion (222) being fixedly connected to the circumferential outer surface of the rotating rod, two rotating rods being provided and symmetrically distributed about the axis of the screen inner cylinder (2), and the two rotating rods being meshed with each other via the pinion (222).

3. A pretreatment device for extracting theaflavins from tea leaves according to claim 1, characterized in that: A discharge port (231) is provided at the lower portion of the partition (23), and a return port (232) is provided at the upper portion of the partition (23).

4. A pretreatment device for extracting theaflavins from tea leaves according to claim 3, characterized in that: One end of the feeding plate (24) away from the feeding box (21) passes through the return port (232) and is fixedly connected to a feeding support plate (241).

5. A pretreatment device for extracting theaflavins from tea leaves according to claim 1, characterized in that: A plurality of material transfer portions (252) distributed in a circumferential array are provided on one side of the sealing plate (25) close to the partition plate (23), and a sealing sheet (251) is fixedly connected between two adjacent material transfer portions (252); The material transfer portion (252) includes a fixed folding plate (2521) and a rotating folding plate (2522), wherein the fixed folding plate (2521) is fixedly connected to the side of the sealing plate (25) close to the partition (23), and the rotating folding plate (2522) is rotatably connected to the side of the sealing plate (25) close to the partition (23) via an axle (25221).

6. A pretreatment device for extracting theaflavins from tea leaves according to claim 5, characterized in that: A special-shaped slide rail (2523) is provided on one side of the partition (23) close to the sealing plate (25), and the special-shaped slide rail (2523) includes a first track (25231), a second track (25232) and a third track (25233) connected end to end. A sliding rod (25222) is rotatably connected to the side of the rotating folding plate (2522) away from the sealing plate (25), and the rotating folding plate (2522) is slidably connected to the special-shaped slide rail (2523) via the sliding rod (25222). In which, during the process of the rotating folding plate (2522) being slidably connected to the first track (25231) through the sliding rod (25222), the rotating folding plate (2522) and the fixed folding plate (2521) are in a fitted and closed state; during the process of the rotating folding plate (2522) being slidably connected to the second track (25232) through the sliding rod (25222), the rotating folding plate (2522) rotates around the axis of the shaft (25221) so that the rotating folding plate (2522) and the fixed folding plate (2521) are in a separated and open state; during the process of the rotating folding plate (2522) being slidably connected to the third track (25233) through the sliding rod (25222), the inclination angle of the rotating end of the rotating folding plate (2522) remains unchanged.

7. A pretreatment device for extracting theaflavins from tea leaves according to claim 1, characterized in that: A lower hopper (26) is fixedly connected to the bottom of the installation frame plate (11), and a collection box (261) is provided below the lower hopper (26).

8. A pretreatment device for extracting theaflavins from tea leaves according to claim 1, characterized in that: A driving motor (3) is fixedly connected to one side of the fixing frame (1); a driving rod (31) is rotatably connected to the inner side wall of the mounting frame plate (11); an output end of the driving motor (3) is fixedly connected to the driving rod (31); a large gear (32) is fixedly connected to the circumferential outer surface of the driving rod (31); a large gear ring (321) is fixedly connected to the circumferential outer surface of the screen outer cylinder (20); the large gear (32) is meshed with the large gear ring (321); and a transmission belt (33) is connected between the driving rod (31) and the rotating rod group (22).

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