An automated withering device and its usage method

Abstract

The present invention discloses an automated withering device and a usage method thereof, relating to the technical field of withering, and comprising a main box body, an annular conveyor, a soft mesh belt, a hot air mechanism and an ultraviolet lamp group. The main box body is a square box body structure with an open top, an air inlet is opened at the lower part of one end, and a blanking port is opened at the bottom of the other end. The annular conveyor is horizontally installed on the upper side inside the main box body and comprises a roller part and a conveyor belt part. The conveyor belt part of the annular conveyor adopts a metal mesh belt. The soft mesh belt is arranged outside the annular conveyor, is in a tensioned state and is detachably connected to the annular conveyor through a plurality of support rods. With the cooperation of the annular conveyor and the soft mesh belt in the present invention, the annular conveyor conveys and causes the tea leaves to fall, and the soft mesh belt moves along with the annular conveyor, which not only realizes the turning and spreading of the tea leaves but also realizes the automatic paving function, avoiding the incomplete withering of the tea leaves in some areas with poor ventilation and heaping, which affects the taste of the tea leaves.

Description

Technical Field

[0001] The present invention relates to the technical field of withering, and in particular to an automated withering device and a use method thereof. Background Art

[0002] Withering, also known as withering carving, is the process of spreading the leaves evenly under certain temperature and humidity conditions to moderately promote the activity of fresh leaf enzymes, and to cause moderate physical and chemical changes in the substances contained in the leaves, dissipating some water, causing the stems and leaves to wilt, turn dark green, and lose the smell of grass. It is an important process in the production of fermented teas such as black tea, oolong tea, and white tea. It refers to the process of losing water after a period of time, causing the hard and brittle stems and leaves to wilt and wither. Withering has both the physical effect of water loss and the process of chemical changes in the substances contained. Its purpose is, first, to evaporate part of the water, reduce the tension of tea cells, soften the leaf stems from brittle, increase the toughness of the buds and leaves, and facilitate rolling into strips; second, the loss of water causes a series of chemical changes in the substances contained in the tea shoots, laying the foundation for the material changes to form the specific quality of black tea color, aroma and flavor;

[0003] The existing tea withering mainly adopts natural drying, sunlight withering and withering trough withering processing methods. Natural withering, whether drying or sunlight withering, is restricted by natural conditions, especially during the rainy Spring Festival, when the temperature is low and the humidity is high. The withering time is dragged out for a long time, or the fresh leaves are piled up and deteriorate, affecting the quality of the tea. The withering trough assisted withering can solve the problem of being restricted by weather. The equipment is mainly composed of four parts: a hot air generator, a blower, a trough body, and a mesh plate. The following technical problems still exist in use: the mesh plate is a fixed structure, and the flat tea leaves are always withered in one state. There are some piles and poorly ventilated areas where tea leaves are piled up or withered incompletely, affecting the taste of the tea and even causing deterioration. If the tea leaves need to be turned over, manual intervention is required, and when the tea leaves are unloaded after withering, the tea leaves on the mesh plate need to be manually collected, which is inefficient and cumbersome to collect manually.

[0004] Therefore, it is necessary to invent an automated withering device and a method of use to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide an automated withering device and a method of use to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: an automated withering device and a method of use, comprising:

[0007] The main box is a square box structure with an open top, an air inlet at the bottom of one end, and a material discharge port at the bottom of the other end;

[0008] The annular conveyor is horizontally installed on the upper side inside the main box body, and includes a rotating roller part and a conveyor belt part. The conveyor belt part of the annular conveyor uses a metal mesh belt, and a plurality of support rods perpendicular to it are fixedly connected to the outer surface of the conveyor belt part of the annular conveyor;

[0009] The soft mesh belt is arranged outside the annular conveyor, in a tensioned state and detachably connected to the outer ends of the plurality of support rods;

[0010] The hot air mechanism sequentially includes a filter box, a blower box and a heat generator from the input end to the output end, and the output end is communicated with the air inlet;

[0011] The ultraviolet lamp group is fixedly installed on the lower side inside the main box body.

[0012] Optionally, it further includes a bottom plate. The main box body is fixedly installed on the upper part of the bottom plate and there is a gap between the two. A plurality of casters are installed on the bottom edge of the bottom plate.

[0013] Optionally, the widths of the conveyor belt part of the annular conveyor and the soft mesh belt are both equal to the inner width of the main box body.

[0014] Optionally, the vertical height from the upper surface of the annular conveyor to the horizontal plane of the top of the main box body is 3 cm - 15 cm, and the distance between the soft mesh belt and the annular conveyor is 30 cm - 80 cm.

[0015] Optionally, a sealing cover is rotatably installed at the top of the end of the main box body where the material discharge port is provided, for sealing the gap between the end of the annular conveyor and the main box body.

[0016] Optionally, a plug board is horizontally inserted at the end of the main box body where the material discharge port is provided, for sealing the material discharge port.

[0017] Optionally, a guide chute is provided on one side of the material discharge port close to the air inlet, and the guide chute is fixedly installed inside the main box body.

[0018] Optionally, a receiving box is provided at the lower part of the material discharge port. The receiving box is placed on the bottom plate and is located in the gap between the main box body and the bottom plate.

[0019] Optionally, a screw is provided at the top end of the support rod, a limiting block is provided at the lower part of the screw, a plurality of through holes corresponding to the support rods are formed on the soft mesh belt, a nut is threadedly installed on the screw, the nut is located outside the soft mesh belt, the outer diameter value of the nut and the diameter value of the limiting block are both larger than the diameter value of the through hole, and the outer diameter value of the screw is less than or equal to the diameter value of the through hole.

[0020] Optionally, it includes the following steps:

[0021] S: Initial state. Most of the soft mesh belt is located above the loop conveyor, and a small part of one end is located below the loop conveyor, and this end is located at the end close to the air inlet.

[0022] S: At the side of the gap between the soft mesh belt and the loop conveyor, thinly spread the tea leaves to be withered on the upper surface of the loop conveyor, or remove the soft mesh belt and thinly spread the tea leaves. Close the sealing cover, push the plug plate to close the feeding port, start the hot air mechanism and the ultraviolet lamp group, and simulate natural withering temperature, gentle breeze and sunlight disinfection for withering. The sealing cover and the feeding port are closed to avoid large-area loss of hot air heat.

[0023] S: When half of the withering time has passed, turn off the hot air mechanism, start the loop conveyor to convey clockwise. The tea leaves on the loop conveyor gradually fall, and the soft mesh belt moves synchronously with the loop conveyor. The falling tea leaves gradually fall on the moving soft mesh belt and are evenly spread. After all the tea leaves on the loop conveyor have fallen, turn off the loop conveyor. All the tea leaves are evenly spread on the soft mesh belt located below the loop conveyor. This operation fully realizes the spreading and re-spreading of the tea leaves, improves the uniformity of heat absorption during withering of the tea leaves, and avoids the deterioration and mildew of the piled tea leaves. Then restart the hot air mechanism to continue withering.

[0024] S: After the tea leaves are withered, turn off the hot air mechanism and the ultraviolet lamp group, open the sealing cover, pull out the plug plate to open the feeding port, and start the loop conveyor to continue rotating clockwise. The conveyor belt part of the loop conveyor moves to drive the soft mesh belt to move. The tea leaves fall due to gravity and accumulate at the inner corner of the soft mesh belt. When the end of the soft mesh belt gradually reaches the corner and gradually moves upward, the piled tea leaves fall from the end of the soft mesh belt and fall into the receiving box through the feeding port, realizing automatic feeding and receiving.

[0025] Technical effects and advantages of the present invention:

[0026] 1. By setting the main box body, the hot air mechanism and the ultraviolet lamp group and their cooperation, the present invention simulates the temperature, gentle breeze and sunlight disinfection of natural withering, as much as possible restores the natural withering environment to improve the quality of the withered tea leaves, and is not affected by the weather during natural withering, and can continuously wither to improve the processing efficiency.

[0027] 2. With the cooperation of the loop conveyor and the soft mesh belt of the present invention, the loop conveyor conveys the tea leaves to fall, and the soft mesh belt moves with the loop conveyor, which not only realizes the turning and spreading of the tea leaves but also realizes the automatic flattening function, avoiding the incomplete withering of the tea leaves in some areas with poor ventilation and piling up, which affects the taste of the tea leaves.

[0028] 3. The cooperation between the annular conveyor and the soft mesh belt can realize the turning of tea leaves, and at the same time, the automatic discharging of the withered tea leaves can be realized during continuous movement. Both the turning and discharging of tea leaves can be automatically controlled, reducing the workload of manual intervention, saving labor and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the vertical structure of the present invention.

[0030] Figure 2 It is a schematic diagram of the structure of the first state of the main view section of the main box body of the present invention.

[0031] Figure 3 It is a schematic diagram of the structure of the second state of the main view section of the main box body of the present invention.

[0032] Figure 4 It is a schematic diagram of the structure of the third state of the main view section of the main box body of the present invention.

[0033] Figure 5 It is a schematic diagram of the split structure of the hot air mechanism of the present invention.

[0034] Figure 6 For the present invention Figure 2 The partial enlarged structure schematic diagram at position A in it.

[0035] In the figure: 1. Main box body; 2. Annular conveyor; 3. Soft mesh belt; 4. Hot air mechanism; 401. Filter box; 402. Fan box; 403. Heat generator; 5. Ultraviolet lamp group; 6. Air inlet; 7. Discharge port; 8. Support rod; 9. Bottom plate; 10. Caster; 11. Air outlet; 12. Sealing cover; 13. Plug board; 14. Guide chute; 15. Receiving box; 16. Limit block; 17. Nut; 18. Dust-proof cloth. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These 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 thus should not be construed as a limitation to the present invention.

[0038] In the present invention, unless otherwise clearly specified and defined, the terms "set", "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] The present invention provides an automated withering device as Figures 1-6 shown, which includes a main box body 1, an annular conveyor 2, a soft mesh belt 3, a hot air mechanism 4, an ultraviolet lamp group 5, and a bottom plate 9;

[0041] The main box body 1 is a square box body structure with an open top, horizontally arranged, made of stainless steel. An air inlet 6 is opened at the lower part of one end for introducing hot air into the main box body 1. A discharge port 7 is opened at the bottom of the end of the main box body 1 far from the air inlet 6 for the withered tea leaves to fall and be discharged. A socket is opened at the bottom of the end of the main box body 1 where the discharge port 7 is located, and a plug board 13 extending into the main box body 1 is inserted at the socket for sealing the discharge port 7 to prevent the hot air introduced into the main box body 1 from being discharged from the discharge port 7 and causing heat loss. A guiding inclined plate 14 is arranged on one side of the discharge port 7 close to the air inlet 6. One end of the guiding inclined plate 14 is in contact with the discharge port 7, and the end in contact with the discharge port 7 slopes upward in the horizontal direction to the opposite end for the tea leaves to slide towards the discharge port 7. The guiding inclined plate 14 is welded to the inner side walls of the main box body 1 adjacent to the two sides or fixed to the inner wall of the main box body 1 by bolts;

[0042] The circular conveyor 2 is horizontally installed on the upper inner side of the main box 1, including a rotating roller part and a conveyor belt part. The conveyor belt part of the circular conveyor 2 adopts a metal mesh belt, which is used for thinly spreading tea leaves. The width of the conveyor belt part of the circular conveyor 2 is consistent with the inner width of the main box 1, that is, the side of the conveyor belt part of the circular conveyor 2 is in contact with the inner wall of the main box 1 to prevent the tea leaves from falling into the main box 1 due to the existence of gaps. The vertical height of the upper surface of the circular conveyor 2 from the horizontal plane of the top of the main box 1 is 3cm-15cm, that is, the main box 1 has a 3cm-15cm limit edge on the upper side of the circular conveyor 2 to prevent the tea leaves from falling outside the device;

[0043] The soft mesh belt 3 is a soft metal mesh belt, which is arranged on the outside of the circular conveyor 2. It is connected to the conveyor belt part of the circular conveyor 2 through multiple support rods 8 in a tensioned state and moves synchronously with the conveyor belt part of the circular conveyor 2. When the soft mesh belt 3 and the conveying part of the circular conveyor 2 are in an ideal tensioned state, the spacing between the soft mesh belt 3 and the conveying part of the circular conveyor 2 is always consistent. The soft mesh belt 3 is used to receive the tea leaves dropped by the circular conveyor 2, so that the tea leaves are scattered and disrupted at one time. The soft mesh belt 3 moves synchronously with the circular conveyor 2 to receive the tea leaves and automatically lay them flat. The width of the soft mesh belt 3 is equal to the width of the inner side of the main box body 1, so as to prevent the gap between the soft mesh belt 3 and the main box body 1 from causing the received tea leaves to fall into the main box body 1.

[0044] The installation method of the soft mesh belt 3 is that the two edges of the outer surface of the conveyor belt part of the ring conveyor 2 are welded or fixedly installed with multiple support rods 8 arranged vertically therewith by other fixed connection methods. The top of the support rod 8 is provided with a limit block 16, which is welded or integrally formed therewith. The outer end of the limit block 16 is provided with a screw coaxial with the support rod 8, which is welded or integrally formed with the limit block 16. The soft mesh belt 3 is provided with multiple through holes corresponding to the support rods 8. The soft mesh belt 3 is placed on the multiple support rods 8 and is in a tensioned state. The screws of the support rods 8 pass through the through holes of the soft mesh belt 3, and the soft mesh belt 3 is placed on the limit block 16. The nut 17 is screwed on the screw to contact and tighten with the soft mesh belt 3 to realize the detachable fixation of the soft mesh belt 3. The outer diameter value of the nut 17 and the diameter value of the limit block 16 are both greater than the diameter value of the through hole, and the outer diameter value of the screw is less than or equal to the diameter value of the through hole.

[0045] It should be noted that: there is a gap between both ends of the ring conveyor 2 and the main box 1 for the soft mesh belt 3 to pass through, and the soft mesh belt 3 is in a corner state when it moves to the end of the ring conveyor 2, and the distance between the nut 17 and the end wall of the main box 1 when the axis moves to a horizontal state is 0.1cm-0.5cm, ensuring that the nut 17 can pass smoothly and avoiding heat loss caused by excessive spacing;

[0046] The hot air mechanism 4 sequentially includes a filter box 401, a blower box 402, and a heat generator 403 from the input end to the output end. The three are connected and detachably installed through flanges. The end of the filter box 401 is open for air to enter. A dust-proof cloth 18 is provided inside the filter box 401 for air filtration to prevent dust and other impurities in the air from contacting the tea leaves and affecting the tea quality. A blower is provided inside the blower box 402 for drawing air. The heat generator 403 serves as a heat source to provide heat energy. The drawn air forms hot air after passing through the heat generator 403 for tea withering. An air outlet 11 is provided at the output end of the heat generator 403. The air outlet 11 is connected to the air inlet 6 of the main box body 1 through a pipeline. The hot air produced by the hot air mechanism 4 is sent into the main box body 1 for tea withering. A cold air door is provided on the pipeline for ventilation to adjust the temperature. The type of heating mechanism used in the heat generator 403 is not limited as long as it can generate heat energy;

[0047] The ultraviolet lamp group 5 is fixedly installed on the lower side inside the main box body 1 through bolts, located below the ring conveyor 2 and the soft mesh belt 3, and is used for ultraviolet disinfection of the tea leaves to simulate the function of sunlight disinfection;

[0048] The bottom plate 9 is horizontally arranged. The main box body 1 is fixedly installed on the upper part of the bottom plate 9 through metal rods, and there is a gap between the two. The hot air mechanism 4 is fixedly installed on the upper surface of the bottom plate 9 and is located within this gap. A receiving box 15 is placed on the bottom plate 9, located within this gap and below the blanking port 7, for receiving the tea leaves during blanking. A plurality of casters 10 are installed on the bottom edge of the bottom plate 9 to enable the equipment to be movable.

[0049] The distance between the soft mesh belt 3 and the ring conveyor 2 is 30 cm - 80 cm. When the soft mesh belt 3 is located above the ring conveyor 2, there is a gap between the edge of the upper soft mesh belt 3 and the top of the main box body 1, which is used to check the tea leaves or spread the tea leaves for feeding without disassembling the soft mesh belt 3.

[0050] A sealing cover 12 is rotatably installed at the top of one end of the main box body 1 where the blanking port 7 is provided, for sealing the gap between the end of the ring conveyor 2 and the main box body 1 to prevent hot air from escaping from this gap and causing heat loss.

[0051] The present invention also provides a usage method of the automatic withering equipment, including the following steps:

[0052] S1: As Figure 2 shown: In the initial state, most of the soft mesh belt 3 is located above the ring conveyor 2, and a small part of one end is located below the ring conveyor 2, and this end is located at the end close to the air inlet 6;

[0053] S2: At the side of the gap between the soft mesh belt 3 and the ring conveyor 2, thinly spread the tea leaves to be withered on the upper surface of the ring conveyor 2, or remove the soft mesh belt 3 and thinly spread the tea leaves. Close the sealing cover 12, push the plug board 13 to close the blanking port 7, start the hot air mechanism 4 and the ultraviolet lamp group 5, and simulate natural withering temperature, gentle breeze and sunlight disinfection for withering. The sealing cover 12 and the blanking port 7 are closed to avoid large-area loss of hot air heat;

[0054] S3: As Figure 3 shown: When half of the withering time has passed, turn off the hot air mechanism 4, start the ring conveyor 2 to rotate clockwise. The tea leaves on the ring conveyor 2 gradually fall. The soft mesh belt 3 moves synchronously with the ring conveyor 2. The falling tea leaves gradually fall on the moving soft mesh belt 3 and are evenly spread out. After all the tea leaves on the ring conveyor 2 have fallen, turn off the ring conveyor 2. All the tea leaves are evenly spread on the soft mesh belt 3 located below the ring conveyor 2. This operation fully realizes the spreading and re-spreading of the tea leaves, improves the uniformity of heat absorption during withering of the tea leaves, and avoids the deterioration and mildew of the piled-up tea leaves. Restart the hot air mechanism 4 to continue withering;

[0055] S4: As Figure 4 shown: After the tea leaves are withered, turn off the hot air mechanism 4 and the ultraviolet lamp group 5, open the sealing cover 12, pull out the plug board 13 to open the blanking port 7, and start the ring conveyor 2 to continue rotating clockwise. The conveyor belt part of the ring conveyor 2 moves to drive the soft mesh belt 3 to move. The tea leaves fall due to gravity and accumulate at the inner corner of the soft mesh belt 3. When the end of the soft mesh belt 3 gradually reaches the corner and gradually moves upward, the piled-up tea leaves fall from the end of the soft mesh belt 3 and fall into the receiving box 15 through the blanking port 7, realizing automatic blanking and receiving.

[0056] The cooperation between the soft mesh belt 3 and the ring conveyor 2 not only realizes the complete turning and spreading of the tea leaves to avoid incomplete withering of the tea leaves in the poorly ventilated areas with excessive piling, which affects the taste of the tea leaves, but also realizes the automatic flattening of the spread tea leaves. Moreover, the continuous movement of the ring conveyor 2 also realizes the automatic blanking of the tea leaves. The design of this structure is simple and reasonable, and has multiple effects, with outstanding use value and can be widely promoted.

[0057] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automated withering device, characterized in that, it includes: A main box body (1), which is a square box structure with an open top, and an air inlet (6) is provided at the lower part of one end, and a blanking port (7) is provided at the bottom of the other end; An annular conveyor (2), horizontally installed on the upper side inside the main box body (1), including a roller part and a conveyor belt part. The conveyor belt part of the annular conveyor (2) uses a metal mesh belt, and the outer surface of the conveyor belt part of the annular conveyor (2) is fixedly connected with a plurality of support rods (8) vertically arranged thereon; A soft mesh belt (3), arranged outside the annular conveyor (2), in a tensioned state and detachably connected to the outer ends of the plurality of support rods (8); A hot air mechanism (4), which sequentially includes a filter box (401), a fan box (402) and a thermal generator (403) from the input end to the output end, and the output end is communicated with the air inlet (6); An ultraviolet lamp group (5), fixedly installed on the lower side inside the main box body (1).

2. The automated withering device according to claim 1, characterized in that: It further includes a bottom plate (9), the main box body (1) is fixedly installed on the upper part of the bottom plate (9) and there is a gap between the two, and a plurality of casters (10) are installed on the bottom edge of the bottom plate (9).

3. The automated withering device according to claim 2, characterized in that: The width of the conveyor belt part of the annular conveyor (2) and the width of the soft mesh belt (3) are both equal to the inner width of the main box body (1).

4. The automated withering device according to claim 3, characterized in that: The vertical height from the upper surface of the annular conveyor (2) to the horizontal plane of the top of the main box body (1) is 3 cm - 15 cm, and the distance between the soft mesh belt (3) and the annular conveyor (2) is 30 cm - 80 cm.

5. The automated withering device according to claim 4, characterized in that: A sealing cover (12) is rotatably installed at the top of the end of the main box body (1) provided with the blanking port (7) for sealing the gap between the end of the annular conveyor (2) and the main box body (1).

6. The automated withering device according to claim 5, characterized in that: A plug board (13) is horizontally inserted into the end of the main box body (1) provided with the blanking port (7) for sealing the blanking port (7).

7. The automated withering device according to claim 6, characterized in that: A guide chute (14) is provided on the side of the blanking port (7) close to the air inlet (6), and the guide chute (14) is fixedly installed inside the main box body (1).

8. The automated withering device according to claim 7, characterized in that: A receiving box (15) is provided at the lower part of the blanking port (7), and the receiving box (15) is placed on the bottom plate (9) and is located in the gap between the main box body (1) and the bottom plate (9).

9. The automated withering device according to claim 8, characterized in that: The top end of the support rod (8) is provided with a screw rod, a limiting block (16) is arranged at the lower part of the screw rod, a plurality of through holes corresponding to the support rod (8) are formed in the soft net belt (3), a nut (17) is threadedly mounted on the screw rod, the nut (17) is located outside the soft net belt (3), the outer diameter value of the nut (17) and the diameter value of the limiting block (16) are both larger than the diameter value of the through hole, and the outer diameter value of the screw rod is less than or equal to the diameter value of the through hole.

10. The usage method of an automatic withering device according to claim 9, characterized in that: it includes the following steps: S1: In the initial state, most of the soft net belt (3) is located above the ring conveyor (2), a small part of one end is located below the ring conveyor (2), and this end is located at the end close to the air inlet (6); S2: At the side of the gap between the soft net belt (3) and the ring conveyor (2), the tea leaves to be withered are thinly spread on the upper surface of the ring conveyor (2), or the soft net belt (3) is removed and the tea leaves are thinly spread, the sealing cover (12) is closed, the plug plate (13) is pushed to close the blanking port (7), the hot air mechanism (4) and the ultraviolet lamp group (5) are started, and withering is carried out by simulating the natural withering temperature, gentle breeze and sunlight disinfection. The sealing cover (12) and the blanking port (7) are closed to avoid large-area loss of the heat of the hot air; S3: When half of the withering time has passed, the hot air mechanism (4) is closed, the ring conveyor (2) is started to rotate clockwise, the tea leaves on the ring conveyor (2) gradually fall, the soft net belt (3) moves synchronously with the ring conveyor (2), and the falling tea leaves gradually fall on the moving soft net belt (3) and are spread out. After all the tea leaves on the ring conveyor (2) have fallen, the ring conveyor (2) is closed, and all the tea leaves are spread out on the soft net belt (3) located below the ring conveyor (2). This operation fully realizes the spreading and re-spreading of the tea leaves, improves the uniformity of the tea leaves' withering and heating, and avoids the deterioration and mildew of the piled-up tea leaves. Then the hot air mechanism (4) is restarted to continue withering; S4: After the tea leaves are withered, the hot air mechanism (4) and the ultraviolet lamp group (5) are closed, the sealing cover (12) is opened, the plug plate (13) is pulled out to open the blanking port (7), and the ring conveyor (2) is started to continue rotating clockwise. The conveyor belt part of the ring conveyor (2) moves to drive the soft net belt (3) to move. The tea leaves fall due to gravity and accumulate at the inner corner of the soft net belt (3). When the end of the soft net belt (3) gradually reaches the corner and gradually moves upward, the piled-up tea leaves fall from the end of the soft net belt (3) and fall into the receiving box (15) through the blanking port (7), realizing automatic blanking and material collection.

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