Treatment equipment for improving theaflavin of black tea and processing method thereof

Abstract

The processing equipment comprises a cooling barrel, a material barrel and a barrel cover, the upper end of the cooling barrel and the upper end of the material barrel are open, the material barrel is vertically located in the cooling barrel, the vertical center axis of the material barrel coincides with the vertical center axis of the cooling barrel, and the vertical center axis of the material barrel is perpendicular to the vertical center axis of the cooling barrel. A gap is formed between the outer wall of the material barrel and the inner wall of the cooling barrel, a gap is formed between the outer bottom surface of the material barrel and the inner bottom surface of the cooling barrel, and the barrel cover is detachably mounted at the opening part of the cooling barrel. According to the method, spring, summer and autumn fresh tea leaf raw materials are fully utilized, feeding and taking are convenient, the spring, summer and autumn fresh tea leaf raw materials can make full contact with liquid nitrogen under the action of leaf stirring and can be frozen for a short period of time in the constant low-temperature state, the fresh tea leaf raw materials and fresh leaves can be subjected to full low-temperature freezing, later-stage further processing is convenient, and the tea leaf raw materials are not prone to being damaged. After the black tea is prepared, the content of theaflavin can be greatly increased.

Description

Technical Field

[0001] The invention relates to the technical field of black tea processing, in particular to a processing device for improving theaflavins in black tea and a processing method thereof. Background Art

[0002] Tea yellow pigment, also known as theaflavin, is a golden pigment found in black tea and is a product of tea fermentation. In biochemistry, tea yellow pigment is a type of substance with a benzophenone structure of polyphenolic hydroxyl groups. It is the first compound with a definite pharmacological effect found in tea. The content of theaflavin directly affects the flavor of black tea. Theaflavin extracted from black tea is also widely used in food, cosmetics and other fields. It is called the "soft gold" in tea. The traditional black tea processing technology is fully fermented tea, which is processed through fresh leaf picking, withering, rolling, fermentation, drying and other processes. The rolling time is long, the cell damage rate is not easy to meet the requirements, the fermentation is difficult to be moderate, and the polyphenols are not fully oxidized, resulting in a low content of theaflavin.

[0003] The present invention is proposed in view of the above problems. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a processing device and a processing method for improving theaflavins in black tea, so as to solve the problems mentioned in the background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions.

[0006] The present invention provides a processing device for improving theaflavins in black tea, comprising a cooling barrel, a material barrel and a barrel cover, wherein the upper ends of the cooling barrel and the material barrel are both open, the material barrel is vertically located in the cooling barrel, the vertical center axis of the material barrel coincides with the vertical center axis of the cooling barrel, there is a gap between the outer wall of the material barrel and the inner wall of the cooling barrel, there is a gap between the outer bottom surface of the material barrel and the inner bottom surface of the cooling barrel, and the barrel cover is detachably installed at the mouth of the cooling barrel;

[0007] Two slide posts are symmetrically arranged on both sides of the outer wall of the material barrel, and two inner slide grooves are symmetrically arranged on both sides of the inner wall of the cooling barrel. The top of the inner slide groove passes through the upper surface of the cooling barrel, and the slide posts are slidably installed in the inner slide groove;

[0008] Two electric push rods are symmetrically and vertically arranged on both sides of the outer wall of the cooling barrel, a first adapter block is arranged on the upper end of the electric push rod, and second adapter blocks are symmetrically arranged on both sides above the outer wall of the material barrel, and the first adapter block and the second adapter block are rotatably connected at opposite ends;

[0009] A top plate is horizontally arranged on the inner top surface of the material barrel, and a motor is arranged at the central position of the upper surface of the top plate. The driving shaft of the motor faces downward and is connected to a main shaft. The main shaft is vertically located at the central axis position of the material barrel, and the lower end of the main shaft is movably installed on the inner bottom surface of the material barrel. A plurality of layers of stirring blades are evenly spaced from bottom to top on the surface of the main shaft. The stirring blades are perpendicular to the main shaft, and an end of the stirring blade away from the main shaft is close to the inner wall of the material barrel.

[0010] Preferably, a liquid inlet pipe connected to the interior of the cooling barrel is arranged above the surface of the cooling barrel, a liquid outlet pipe connected to the interior of the cooling barrel is arranged in the center of the lower surface of the cooling barrel, valves are arranged on the liquid inlet pipe and the liquid outlet pipe, and a plurality of liquid inlet holes connected to the interior of the material barrel are arranged on the surface and the outer bottom surface of the material barrel.

[0011] Preferably, the upper surface of the barrel cover is vertically provided with a first temperature transmitter, a second temperature transmitter and a liquid level transmitter which penetrate the barrel cover, the detection rod of the first temperature transmitter is located in the material barrel close to the inner wall of the material barrel, the detection rod of the second temperature transmitter and the detection rod of the liquid level transmitter are both located between the inner wall of the cooling barrel and the outer wall of the material barrel, and the lower end of the detection rod of the liquid level transmitter is close to the inner bottom surface of the cooling barrel.

[0012] Preferably, the upper port portion of the cooling barrel is provided with a first folded edge, and the lower port portion of the barrel cover is provided with a second folded edge, the first folded edge is symmetrically provided with two first notches, and the second folded edge is symmetrically provided with two second notches, the first notches and the second notches are aligned up and down, the first notch is adapted to the upper end of the electric push rod, and the second notch is adapted to the first adapter block and the second adapter block.

[0013] Preferably, a plurality of first through holes distributed in a circular shape are evenly and evenly arranged on the first folded edge, and a plurality of second through holes distributed in a circular shape are evenly and evenly arranged on the second folded edge. The first through holes and the second through holes are aligned vertically, and the fastening bolts pass through the first through holes and the second through holes.

[0014] Preferably, the liquid inlet holes on the side wall of the material barrel are arranged in multiple layers at equal intervals from bottom to top, each layer has multiple liquid inlet holes, and each layer has multiple liquid inlet holes that are evenly distributed around the material barrel, and the multiple liquid inlet holes on the bottom surface of the material barrel are evenly distributed radially at equal intervals.

[0015] Preferably, each layer has three to four stirring blades which are evenly distributed around the main shaft at equal intervals, and the stirring blades in the upper and lower layers are staggered, the stirring blades are inclined, and the edges of the stirring blades are arc-shaped.

[0016] Preferably, a plurality of clamps are provided on both sides of the surface of the cooling barrel from bottom to top through bolts, the cylinder body of the electric push rod is located in the clamps, four legs are evenly arranged around the outer bottom surface of the cooling barrel, two second side handles are symmetrically arranged above the surface of the material barrel, and two second side handles are symmetrically arranged above the surface of the barrel cover.

[0017] A processing method using a processing device for increasing theaflavins in black tea, characterized in that it comprises the following steps:

[0018] S1. Use fresh leaves from spring, summer and autumn tea trees, put the raw materials into the material barrel and cover the barrel;

[0019] S2. Liquid nitrogen is fed into the cooling barrel through the liquid inlet pipe, and the liquid nitrogen in the cooling barrel flows into the material barrel through the liquid inlet hole;

[0020] S3, the motor starts to work, the main shaft and the stirring blade rotate, so that the raw materials and liquid nitrogen are fully in contact and maintained for 10 minutes;

[0021] S4. Thaw the frozen raw materials to remove surface water, knead for 50 minutes, naturally ferment at room temperature for 5 hours, bake at 100°C until 60% dry, spread for 30 minutes, and bake at 75°C until fully dry.

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

[0023] By fastening the bolts installed in the first through hole and the second through hole, the barrel cover can be detachably installed at the top entrance of the cooling barrel, and the fresh leaf raw materials are placed in the material barrel, and then the barrel cover is closed; liquid nitrogen is sent into the cooling barrel through the liquid inlet pipe, and the liquid level height of the liquid nitrogen can be known in real time through the liquid level transmitter, so that the liquid nitrogen covers all the fresh leaf raw materials, and the liquid nitrogen can flow freely in the liquid inlet hole, so that the liquid nitrogen can contact with all the fresh leaf materials;

[0024] The motor starts to drive the main shaft to rotate, and the stirring blades rotate together with the main shaft. The multiple stirring blades from bottom to top can fully stir the fresh leaf materials, so that the liquid nitrogen and the fresh leaf materials are fully contacted, so that the fresh leaf materials are in a frozen state; the edge of the stirring blade is arc-shaped, which will not damage the fresh leaf materials;

[0025] During the freezing process of the fresh leaf raw material, the values ​​on the first temperature transmitter and the second temperature transmitter are observed to make the temperature inside the material barrel consistent with the temperature outside the material barrel and maintain it for a short period of time, so that the fresh leaf raw material is frozen for a period of time in a constant low temperature environment; when the freezing is completed, the liquid nitrogen is discharged from the liquid outlet pipe and the barrel cover is opened;

[0026] The two electric push rods extend to push the first adapter block, the second adapter block and the material barrel upward as a whole, so that the bottom surface of the material barrel is located at the mouth of the cooling barrel; the worker holds the second side handle and turns the material barrel to tilt the mouth of the material barrel, which makes it easy to pour out the frozen fresh leaf raw materials in the material barrel, and it is very convenient to take out the materials;

[0027] The device is convenient for feeding and taking out fresh leaf raw materials. During the action of stirring the leaves, the fresh leaf raw materials can be fully in contact with liquid nitrogen and can be frozen for a short period of time under a constant low temperature state. Before withering, -196°C liquid nitrogen freezing treatment is used for 10 minutes, and the standard of conventional withering for 16 hours can be achieved in a short time. The cell breakage rate of the leaves can be effectively increased, and the fermentation of black tea can be promoted. The content of methyl salicylate with herbal and minty aromas, geraniol with floral aromas, and linalool with floral, fruity and woody aromas is increased, the content of theaflavins in black tea is increased, the quality and flavor of black tea are improved, the cost of extracting theaflavins is shortened, the rate of tea trees being harvested in summer and autumn is increased, and farmers' income is increased. Each fresh leaf can be fully frozen at a low temperature, which is convenient for further processing in the later stage. After being made into black tea, the content of theaflavins can be greatly increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall stereogram of the present invention;

[0029] Figure 2 This is a three-dimensional diagram of the cooling barrel of the present invention;

[0030] Figure 3 It is a three-dimensional diagram of the material barrel of the present invention moving upward;

[0031] Figure 4 It is a three-dimensional diagram of the rotation of the material barrel of the present invention;

[0032] Figure 5 It is a three-dimensional diagram of the main shaft and stirring blade of the present invention;

[0033] Figure 6 It is a three-dimensional diagram of the barrel cover of the present invention.

[0034] In the figure: 1. cooling barrel; 11. supporting leg; 12. liquid inlet pipe; 13. liquid outlet pipe; 14. electric push rod; 15. clamp; 16. first notch; 17. inner slide groove; 18. first adapter block; 19. first through hole; 2. material barrel; 21. slide column; 22. second side handle; 23. second adapter block; 24. top plate; 25. motor; 26. main shaft; 27. stirring blade; 28. liquid inlet hole; 29. ​​second through hole; 291. fastening bolt; 3. barrel cover; 31. first temperature transmitter; 32. second temperature transmitter; 33. liquid level transmitter; 34. first side handle; 35. second notch. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] like Figure 1-6 As shown, a processing device for improving theaflavins in black tea comprises a cooling barrel 1, a material barrel 2 and a barrel cover 3. The upper ends of the cooling barrel 1 and the material barrel 2 are open, the material barrel 2 is vertically located in the cooling barrel 1, the vertical center axis of the material barrel 2 coincides with the vertical center axis of the cooling barrel 1, there is a gap between the outer wall of the material barrel 2 and the inner wall of the cooling barrel 1, there is a gap between the outer bottom surface of the material barrel 2 and the inner bottom surface of the cooling barrel 1, that is, liquid nitrogen can flow freely between the material barrel 2 and the cooling barrel 1, and the barrel cover 3 is detachably installed at the mouth of the cooling barrel 1;

[0038] Two slide posts 21 are symmetrically arranged on both sides of the outer wall of the material barrel 2, and two inner slide grooves 17 are symmetrically arranged on both sides of the inner wall of the cooling barrel 1. The top of the inner slide groove 17 passes through the upper surface of the cooling barrel 1. The slide posts 21 are slidably installed in the inner slide groove 17, that is, the slide posts 21 can move up and down in the inner slide groove 17, and the slide posts 21 play a guiding role in the upward movement of the material barrel 2;

[0039] Two electric push rods 14 are symmetrically and vertically arranged on both sides of the outer wall of the cooling barrel 1, and a first adapter block 18 is arranged on the upper end of the electric push rod 14. Second adapter blocks 23 are symmetrically arranged on both sides above the outer wall of the material barrel 2. The first adapter block 18 and the second adapter block 23 are rotatably connected at opposite ends. The extension and retraction of the electric push rod 14 can drive the first adapter block 18 and the second adapter block 23 to move up and down, and the material barrel 2 moves up and down with the second adapter block 23;

[0040] A top plate 24 is horizontally arranged on the inner top surface of the material barrel 2, and a motor 25 is arranged at the central position of the upper surface of the top plate 24. The top plate 24 supports the motor 25. The driving shaft of the motor 25 faces downward and is connected to a main shaft 26. The main shaft 26 is vertically located at the central axis position of the material barrel 2. The lower end of the main shaft 26 is movably installed on the inner bottom surface of the material barrel 2. The motor 25 can drive the main shaft 26 to rotate. A plurality of layers of stirring blades 27 are arranged on the surface of the main shaft 26 at equal intervals from bottom to top. The stirring blades 27 are perpendicular to the main shaft 26. The end of the stirring blade 27 away from the main shaft 26 is close to the inner wall of the material barrel 2. When the stirring blade 27 rotates, it can stir the fresh leaf raw materials so that the fresh leaf raw materials are fully in contact with the liquid nitrogen.

[0041] A liquid inlet pipe 12 connected to the interior of the cooling barrel 1 is arranged above the surface of the cooling barrel 1, and a liquid outlet pipe 13 connected to the interior of the cooling barrel 1 is arranged in the center of the lower surface of the cooling barrel 1. Valves are arranged on the liquid inlet pipe 12 and the liquid outlet pipe 13, and a plurality of liquid inlet holes 28 connected to the interior of the material barrel 2 are arranged on the surface and the outer bottom surface of the material barrel 2, that is, liquid nitrogen enters the cooling barrel 1 through the liquid inlet pipe 12, and then enters the material barrel 2 through the liquid inlet hole 28. After freezing is completed, the liquid nitrogen flows out from the liquid outlet pipe 13.

[0042] A first temperature transmitter 31, a second temperature transmitter 32 and a liquid level transmitter 33 penetrating the barrel cover 3 are vertically arranged on the upper surface of the barrel cover 3. The detection rod of the first temperature transmitter 31 is located in the material barrel 2 close to the inner wall of the material barrel 2. The detection rod of the second temperature transmitter 32 and the detection rod of the liquid level transmitter 33 are both located between the inner wall of the cooling barrel 1 and the outer wall of the material barrel 2. The lower end of the detection rod of the liquid level transmitter 33 is close to the inner bottom surface of the cooling barrel 1.

[0043] The upper port of the cooling barrel 1 is provided with a first folded edge, and the lower port of the barrel cover 3 is provided with a second folded edge. The first folded edge is symmetrically provided with two first notches 16, and the second folded edge is symmetrically provided with two second notches 35. The first notch 16 and the second notch 35 are aligned up and down, the first notch 16 is adapted to the upper end of the electric push rod 14, and the second notch 35 is adapted to the first adapter block 18 and the second adapter block 23, that is, when the first adapter block 18 and the second adapter block 23 move up and down, there will be no movement interference with the first folded edge and the second folded edge.

[0044] A plurality of first through holes 19 distributed in a circular shape are evenly and evenly arranged on the first folded edge, and a plurality of second through holes 29 distributed in a circular shape are evenly and evenly arranged on the second folded edge. The first through holes 19 and the second through holes 29 are aligned vertically, and the fastening bolts 291 pass through the first through holes 19 and the second through holes 29.

[0045] The liquid inlet holes 28 on the side wall of the material barrel 2 are arranged in multiple layers at equal intervals from bottom to top, and each layer has multiple liquid inlet holes 28. Each layer of multiple liquid inlet holes 28 is evenly distributed around the material barrel 2, and the multiple liquid inlet holes 28 on the inner bottom surface of the material barrel 2 are evenly distributed radially at equal intervals.

[0046] Each layer of stirring blades 27 has three to four stirring blades 27 that are evenly distributed around the main shaft 26 at equal intervals. The stirring blades 27 in the upper and lower layers are staggered. The stirring blades 27 are inclined, and the edges of the stirring blades 27 are arc-shaped.

[0047] A plurality of clamps 15 are provided on both sides of the surface of the cooling barrel 1 from bottom to top through bolts, the cylinder body of the electric push rod 14 is located in the clamps 15, four legs 11 are evenly arranged around the outer bottom surface of the cooling barrel 1, two second side handles 22 are symmetrically arranged above the surface of the material barrel 2, and two second side handles 34 are symmetrically arranged above the surface of the barrel cover 3.

[0048] A processing method using a processing device for increasing theaflavins in black tea, comprising the following steps:

[0049] S1, use fresh leaves of spring, summer and autumn tea trees, put the raw materials into the material barrel 2, and cover the barrel cover 3;

[0050] S2, liquid nitrogen is fed into the cooling barrel 1 through the liquid inlet pipe 12, and the liquid nitrogen in the cooling barrel 1 flows into the material barrel 2 through the liquid inlet hole 28;

[0051] S3, the motor 25 starts working, the main shaft 26 and the stirring blade 27 rotate, so that the raw materials and the liquid nitrogen are fully in contact and maintained for 10 minutes;

[0052] S4. Thaw the frozen raw materials to remove surface water, knead for 50 minutes, naturally ferment at room temperature for 5 hours, bake at 100°C until 60% dry, spread for 30 minutes, and bake at 75°C until fully dry.

[0053] In summary: by fastening the bolts 291 installed in the first through hole 19 and the second through hole 29, the barrel cover 3 can be detachably installed at the top entrance of the cooling barrel 1, and the fresh leaf raw materials are placed in the material barrel 2, and then the barrel cover 3 is closed; liquid nitrogen is sent into the cooling barrel 1 through the liquid inlet pipe 12, and the liquid level height of the liquid nitrogen can be known in real time through the liquid level transmitter 33, so that the liquid nitrogen covers all the fresh leaf raw materials, and the liquid nitrogen can flow freely in the liquid inlet hole 28, so that the liquid nitrogen can contact with all the fresh leaf materials;

[0054] The motor 25 works to drive the main shaft 26 to rotate, and the stirring blades 27 rotate together with the main shaft 26. The multiple stirring blades 27 from bottom to top can fully stir the fresh leaf raw material, so that the liquid nitrogen and the fresh leaf raw material are fully in contact, so that the fresh leaf raw material is in a frozen state; the edge of the stirring blade 27 is arc-shaped, which will not damage the fresh leaf raw material;

[0055] During the freezing process of the fresh leaf raw material, the values ​​on the first temperature transmitter 31 and the second temperature transmitter 32 are observed to make the temperature inside the material barrel 2 consistent with the temperature outside the material barrel 2 and maintain it for a short period of time, so that the fresh leaf raw material is frozen for a period of time in a constant low temperature environment; when the freezing is completed, the liquid nitrogen is discharged from the liquid outlet pipe 13, and the barrel cover 3 is opened;

[0056] The two electric push rods 14 extend to push the first adapter block 18, the second adapter block 23 and the material barrel 2 upward as a whole, so that the lower bottom surface of the material barrel 2 is located at the mouth of the cooling barrel 1; the worker holds the second side handle 22 and rotates the material barrel 2 to tilt the mouth of the material barrel 2, so that it is convenient to completely pour out the frozen fresh leaf raw materials in the material barrel 2, and it is very convenient to take out the materials;

[0057] The device is convenient for feeding and taking out fresh leaf raw materials. Under the action of the stirring blade 27, the fresh leaf raw materials can be fully in contact with liquid nitrogen and can be frozen for a short period of time under a constant low temperature state. Each fresh leaf can be fully frozen at a low temperature, which is convenient for further processing in the later stage. After being made into black tea, the content of theaflavins can be greatly increased.

[0058] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A processing device for increasing theaflavins in black tea, characterized by: It comprises a cooling barrel (1), a material barrel (2) and a barrel cover (3), wherein the upper ends of the cooling barrel (1) and the material barrel (2) are both open, the material barrel (2) is vertically located in the cooling barrel (1), the vertical center axis of the material barrel (2) coincides with the vertical center axis of the cooling barrel (1), there is a distance between the outer wall of the material barrel (2) and the inner wall of the cooling barrel (1), there is a distance between the outer bottom surface of the material barrel (2) and the inner bottom surface of the cooling barrel (1), and the barrel cover (3) is detachably mounted on the mouth of the cooling barrel (1); Two slide columns (21) are symmetrically arranged on both sides of the outer wall of the material barrel (2), and two inner slide grooves (17) are symmetrically arranged on both sides of the inner wall of the cooling barrel (1), the top of the inner slide groove (17) passes through the upper surface of the cooling barrel (1), and the slide column (21) is slidably installed in the inner slide groove (17); Two electric push rods (14) are symmetrically and vertically arranged on both sides of the outer wall of the cooling barrel (1), and a first adapter block (18) is arranged at the upper end of the electric push rod (14). Second adapter blocks (23) are symmetrically arranged on both sides above the outer wall of the material barrel (2), and the first adapter block (18) and the second adapter block (23) are rotatably connected at opposite ends; A top plate (24) is horizontally arranged on the inner top surface of the material barrel (2), and a motor (25) is arranged at the central position of the upper surface of the top plate (24). The driving shaft of the motor (25) faces downward and is connected to a main shaft (26). The main shaft (26) is vertically located at the central axis position of the material barrel (2). The lower end of the main shaft (26) is movably installed on the inner bottom surface of the material barrel (2). A plurality of stirring blades (27) are evenly spaced from bottom to top on the surface of the main shaft (26). The stirring blades (27) are perpendicular to the main shaft (26), and the end of the stirring blade (27) away from the main shaft (26) is close to the inner wall of the material barrel (2).

2. The processing equipment for increasing theaflavins in black tea according to claim 1, characterized in that: A liquid inlet pipe (12) connected to the interior of the cooling barrel (1) is arranged above the surface of the cooling barrel (1), a liquid outlet pipe (13) connected to the interior of the cooling barrel (1) is arranged in the center of the lower surface of the cooling barrel (1), valves are arranged on the liquid inlet pipe (12) and the liquid outlet pipe (13), and a plurality of liquid inlet holes (28) connected to the interior of the material barrel (2) are arranged on the surface and the outer bottom surface of the material barrel (2).

3. The processing equipment for increasing theaflavins in black tea according to claim 1, characterized in that: A first temperature transmitter (31), a second temperature transmitter (32) and a liquid level transmitter (33) penetrating the barrel cover (3) are vertically arranged on the upper surface of the barrel cover (3); a detection rod of the first temperature transmitter (31) is located in the material barrel (2) close to the inner wall of the material barrel (2); the detection rod of the second temperature transmitter (32) and the detection rod of the liquid level transmitter (33) are both located between the inner wall of the cooling barrel (1) and the outer wall of the material barrel (2); and the lower end of the detection rod of the liquid level transmitter (33) is close to the inner bottom surface of the cooling barrel (1).

4. The processing equipment for increasing theaflavins in black tea according to claim 1, characterized in that: The upper end of the cooling barrel (1) is provided with a first folded edge, and the lower end of the barrel cover (3) is provided with a second folded edge. The first folded edge is symmetrically provided with two first notches (16), and the second folded edge is symmetrically provided with two second notches (35). The first notches (16) and the second notches (35) are aligned vertically. The first notches (16) are matched with the upper end of the electric push rod (14), and the second notches (35) are matched with the first adapter block (18) and the second adapter block (23).

5. The processing equipment for increasing theaflavins in black tea according to claim 4, characterized in that: A plurality of first through holes (19) distributed in a circumferential shape are evenly arranged at equal intervals on the first folded edge, and a plurality of second through holes (29) distributed in a circumferential shape are evenly arranged at equal intervals on the second folded edge. The first through holes (19) and the second through holes (29) are aligned vertically, and fastening bolts (291) pass through the first through holes (19) and the second through holes (29).

6. The processing equipment for increasing theaflavins in black tea according to claim 2, characterized in that: The liquid inlet holes (28) on the side wall of the material barrel (2) are arranged in multiple layers at equal intervals from bottom to top, each layer has multiple liquid inlet holes (28), and each layer has multiple liquid inlet holes (28) that are evenly spaced and distributed around the material barrel (2). The multiple liquid inlet holes (28) on the inner bottom surface of the material barrel (2) are evenly spaced and radially distributed around.

7. The processing equipment for increasing theaflavins in black tea according to claim 1, characterized in that: Each layer of the stirring blades (27) has three to four stirring blades which are evenly distributed around the main shaft (26) at equal intervals. The stirring blades (27) in the upper and lower layers are staggered. The stirring blades (27) are inclined and the edges of the stirring blades (27) are arc-shaped.

8. The processing equipment and method for increasing theaflavins in black tea according to claim 1, characterized in that: A plurality of clamps (15) are provided on both sides of the surface of the cooling barrel (1) from bottom to top through bolts, the cylinder body of the electric push rod (14) is located in the clamps (15), four legs (11) are evenly arranged around the outer bottom surface of the cooling barrel (1), two second side handles (22) are symmetrically arranged above the surface of the material barrel (2), and two second side handles (34) are symmetrically arranged above the surface of the barrel cover (3).

9. A processing method using the processing equipment for increasing theaflavins in black tea according to any one of claims 1 to 8, characterized in that: The steps include: S1. Use fresh leaves of spring, summer and autumn tea trees, put the raw materials into the material barrel (2), and cover the barrel lid (3); S2, liquid nitrogen is fed into the cooling barrel (1) through the liquid inlet pipe (12), and the liquid nitrogen in the cooling barrel (1) flows into the material barrel (2) through the liquid inlet hole (28); S3, the motor (25) starts working, the main shaft (26) and the stirring blade (27) rotate, so that the raw materials and liquid nitrogen are fully in contact and maintained for 10 minutes; S4. Thaw the frozen raw materials to remove surface water, knead for 50 minutes, naturally ferment at room temperature for 5 hours, bake at 100°C until 60% dry, spread for 30 minutes, and bake at 75°C until fully dry.

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