A screening device for matcha processing

Abstract

The application relates to the technical field of screening devices, in particular to a screening device for matcha processing, which comprises a feeding machine, a first air separator, a second air separator and a first treatment device, and the feeding machine is provided with a discharge port; the first treatment device comprises a bottom plate and a plurality of first baffles, a second baffle is arranged between two adjacent first baffles, and a plurality of cutting blades are arranged on the second baffle; the first treatment device is adapted with a driving assembly, the driving assembly is used for driving the second baffle to reciprocate along the width direction of the bottom plate, so that the minimum distance between the cutting blade and the corresponding first baffle on one side in a single reciprocating motion is a, wherein 1mm<=a<=1.5mm; the maximum distance between the cutting blade and the corresponding first baffle on one side is b, wherein 20mm<=b<=25mm; and the first treatment device is located in the lower area of the first air separator. The screening device for matcha processing can reduce the adverse influence of coarse tea stems on the drying quality of matcha.

Description

Technical Field

[0001] This invention relates to the field of screening device technology, and specifically to a screening device for matcha processing. Background Technology

[0002] As a high-value-added tea product, the quality of matcha highly depends on the uniformity of drying and the physicochemical homogeneity of the raw tea leaves. With the large-scale expansion of the matcha industry, mechanized harvesting has become the mainstream method for harvesting raw tea leaves due to its advantages of high harvesting efficiency and low labor costs. However, the indiscriminate flat-cut harvesting method used in machine harvesting inevitably mixes in coarse and old tea stems, and the large differences in stem diameter and high degree of lignification of the outer skin become core quality risks in subsequent processing.

[0003] Hot air drying in a tea kiln is a crucial step in matcha processing, directly determining the color, flavor, and storage stability of the raw materials. Due to significant differences in the physical structure and moisture content of tea stems and leaves: leaves have thinner tissue and a larger specific surface area, resulting in faster moisture diffusion and vaporization rates; while coarse stems have a dense, keratinized epidermis, longer longitudinal moisture migration paths, and greater radial diffusion resistance. When the two are dried together in the same kiln, uneven drying is common. This makes leaves prone to chlorophyll degradation and scorching due to excessive heating, while the internal moisture content of coarse stems remains below standard, resulting in high dispersion in the dryness of the entire batch of material.

[0004] Currently, the industry mostly alleviates this problem by separating stems and leaves after drying. However, the quality damage caused by uneven drying is already a fact. This not only leads to uneven particle size in subsequent stone grinding and a gritty texture, but also easily causes moisture absorption and mold growth during storage. Existing processes have not yet effectively solved the problem of uniformity in the mixed drying of machine-harvested tea leaves and stems, thus hindering the improvement of the quality of machine-harvested matcha.

[0005] Therefore, how to reduce the adverse effects of coarse stems on the drying quality of matcha in the hot air drying process of the tea grinder is a technical problem that urgently needs to be solved. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned shortcomings in current matcha processing by providing a screening device for matcha processing, thereby reducing the adverse effects of coarse stems on the drying quality of matcha.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A screening device for matcha processing includes a feeding machine, a first air separator, a second air separator, and a first processing device. The feeding machine is used to receive tea materials conveyed by a conveyor belt. The feeding machine is provided with a discharge port from which the tea materials inside the feeding machine flow out. The first air separator is used to air separate the tea materials flowing out of the discharge port. The motor power of the first air separator is adjustable. The first processing device includes a base plate and a plurality of first baffles. The plurality of first baffles are vertical and are arranged at intervals on the base plate along the width direction. A second baffle is provided between two adjacent first baffles. A plurality of cutting blades are provided on the second baffles. The cutting blades are vertically arranged on two sides of the second baffles. The plurality of cutting blades are arranged at intervals along the length direction of the second baffles. An angle α is formed between the length direction of the cutting blades and the length direction of the second baffles, wherein 60°≤angle α≤90°. The first processing device is equipped with a drive assembly, which drives the second baffle to reciprocate along the width direction of the base plate, so that in a single reciprocating motion, the minimum distance between the cutting edge of the cutting blade and the first baffle on the corresponding side is a, where 1mm≤a≤1.5mm; and the maximum distance between the cutting edge of the cutting blade and the first baffle on the corresponding side is b, where 20mm≤b≤25mm. The first processing device is located in the area below the first air separator, and the base plate is inclined relative to the horizontal plane. The first processing device is used to receive the tea stems screened by the first air separator. After the tea stems fall into the first processing device, they can be cut by the cutting blade and flow out of the first processing device along the gap between the first baffle and the second baffle. The second air separator is used to air separate the tea material flowing out of the first processing device. The motor power of the second air separator is adjustable.

[0008] As the preferred technical solution of this application, the driving component includes a reciprocating motor and a movable rod, and a plurality of second baffles are connected to the movable rod. The reciprocating motor is used to drive the movable rod to reciprocate so that the second baffles move back and forth along the width direction of the base plate.

[0009] As the preferred technical solution of this application, the tilt angle of the base plate relative to the horizontal plane is β, wherein 5°≤β≤10°.

[0010] As the preferred technical solution of this application, the vertical distance between the cutting edge of the cutting blade and the side of the second baffle is h, where 3mm≤h≤6mm.

[0011] As the preferred technical solution of this application, the distance between any two adjacent first baffles is equal, the distance between any two adjacent second baffles is equal, and the distance between any two adjacent first baffles and the distance between any two adjacent second baffles are equal.

[0012] As a preferred technical solution of this application, it also includes a frame, on which the feeding machine, the first air separator, the second air separator and the first processing device are all mounted.

[0013] As the preferred technical solution of this application, the feeding machine has a funnel-shaped structure with an open top and a narrow bottom.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: In this application, before drying the tea leaves, the tea grinder typically involves the following steps: spreading out fresh leaves, chopping fresh leaves, steaming to kill the green, and cooling the loose tea. In the chopping step, the fresh leaves are usually cut into small pieces of about 3cm using machinery. After the tea leaves are cooled, a conveyor device typically transports them to the top conveyor belt of the tea grinder. The screening device for matcha processing in this application is located below the end of the conveyor device; that is, after being transported to a high point, the cooled loose tea leaves fall into the feeding machine. Under the blowing of the first air separator, the tea leaves are sieved, causing pure leaves and fine stems with leaves to be blown relatively far apart, while pure coarse stems and coarse stems with leaves are blown relatively close together. The first processing device receives the pure coarse stems and coarse stems with leaves that are blown relatively close together, collectively referred to as the initial sieved tea leaves. After falling onto the first processing device, some of the initial sieved tea leaves are located in the area between the first and second baffles, while some fall above the first or second baffle and do not fall into the first baffle. In the area between the first and second baffles, when the drive assembly drives the second baffle to reciprocate along the width direction of the base plate, on the one hand, the reciprocating motion of the second baffle can shake the initial sieved tea leaves falling above the second baffle, so that the initial sieved tea leaves fall into the area between the first and second baffles during the shaking process; on the other hand, the second baffle drives the cutting blade to move, and during the reciprocating motion of the second baffle, it ensures that there is a minimum distance 'a' between the cutting edge of the cutting blade and the corresponding side of the first baffle, and this minimum distance 'a' can reduce the chance of the leaves being shredded. The rate, that is, in the area where the coarse stem with leaves is sandwiched between the first baffle and the second baffle, based on the softness of the leaves after steam fixation and cooling, the minimum distance 'a' leaves space is reserved for the leaves, making it difficult to cut the part of the leaves away from the tea stem. The diameter of the coarse tea stem is usually about 3mm, which is smaller than the minimum distance 'a', so that the cutting blade will cut the coarse tea stem to form a cut on the coarse tea stem. At the same time, the cutting blade has a chance to cut the part of the coarse tea stem that is connected to the leaves, thus having a chance to separate the leaves from the coarse tea stem.On the one hand, during the reciprocating motion of the second baffle driven by the drive component, the drive component itself is one of the main sources of vibration. Based on the connection between the drive component and the base plate, the vibration of the drive component can be transmitted to the base plate, causing the first processing device to vibrate. Thus, since the base plate is inclined relative to the horizontal plane, under the action of this vibration, it is more conducive for the tea material to move from high to low along the gap between the first baffle and the second baffle, so as to facilitate the tea material to flow out from the first processing device. At this time, the tea material flowing out mainly includes leaves that have been separated from the tea stems, tea stems with leaves, and pure tea stems. The tea stems with leaves and pure tea stems are basically cut by the cutting blades and form incisions. Then, under the air separation action of the second air separator, the leaves that have been separated from the tea stems can be blown relatively far away, while the coarse stems with leaves and pure coarse stems are blown relatively close, thereby screening the tea material. Based on the above, when the screening device for matcha processing is arranged such that the airflow direction of the first air separator is in the same direction as the movement direction of the upper surface of the uppermost conveyor belt on the tea grinder, the point where coarse stems with leaves and pure coarse stems are blown onto the uppermost conveyor belt is closer than the point where pure leaves and fine stems with leaves are blown onto the uppermost conveyor belt. Regarding the uppermost conveyor belt on the tea grinder, after the coarse stems with leaves and pure coarse stems fall onto the uppermost conveyor belt, in subsequent processes, pure leaves and fine stems with leaves can fall above the coarse stems with leaves and pure coarse stems that have already fallen onto the uppermost conveyor belt, thus ensuring... Pure tea leaves and thin stems with leaves are laid on top of coarse stems with leaves and pure coarse stems. The coarse stems with leaves and pure coarse stems are cut by the cutting blades, which makes it easier for the coarse tea stems to evaporate moisture, thus shortening the drying time difference between the coarse tea stems and the leaves or thin stems, thereby improving the uniformity of stem and leaf drying. At the same time, the tea material carried by the top conveyor belt on the tea grinder is the first part to be dried in the entire tea grinder drying process. The tea material with the highest moisture content is located in this part. The coarse tea stems at the bottom layer help to build a breathable framework, further reducing the chance of browning due to steaming. Thus, by pre-screening the tea leaves before drying, and then processing the screened tea leaves through the first processing device, the uniformity of leaf mixing during subsequent drying can be improved, thereby reducing the adverse effects of coarse stems on the drying quality of matcha and thus improving the quality of matcha. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a screening device for matcha processing according to one embodiment of the present application, when it is used in conjunction with a tea grinding furnace and a conveying device. Figure 2 This is a partial structural diagram of a screening device for matcha processing according to one embodiment of the present application, when it is used in conjunction with a tea grinding furnace and a conveying device. Figure 3 This is a schematic diagram of the planar structure of a screening device for matcha processing according to one embodiment of the present application, when it is used in conjunction with a tea grinding furnace and a conveying device. Figure 4 This is a schematic diagram of one embodiment of a screening device for matcha processing according to this application; Figure 5 This is a side view of the first processing device in one embodiment of a screening device for matcha processing according to this application. Figure 6 This is a schematic diagram of the structure of the first processing device and the drive component in one embodiment of the screening device for matcha processing according to this application; Figure 7 This application discloses a screening device for matcha processing. Figure 6 A magnified structural diagram of part A in the middle; Figure 8 This is a schematic diagram of the structure of a first processing device in one embodiment of a screening device for matcha processing according to this application, in which a plurality of first baffles are spaced apart and a plurality of second baffles are spaced apart. Figure 9 This application discloses a screening device for matcha processing. Figure 8 A magnified structural diagram of part B in the middle section; Figure 10 This is a schematic diagram of the structure of a screening device for matcha processing according to one embodiment of the present application, in which several second baffles are spaced apart. The diagram shows: 1-feeder, 2-first air separator, 3-second air separator, 4-first processing device, 5-discharge port, 6-bottom plate, 7-first baffle, 8-second baffle, 9-cutting blade, 10-drive assembly, 11-reciprocating motor, 12-moving rod, 13-frame; 101-Conveying device, 102-Upper conveyor belt, 103-Tea grinding furnace. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0017] Therefore, the following detailed description of embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely illustrates some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] Example 1: This example provides a screening device for matcha processing. See [link to example]. Figures 1-10 As shown, it includes a feeding machine 1, a first air separator 2, a second air separator 3, and a first processing device 4. The feeding machine 1 is used to receive the tea material conveyed by the conveyor belt. The feeding machine 1 is provided with a discharge port 5. The tea material in the feeding machine 1 flows out from the discharge port 5. The first air separator 2 is used to air separate the tea material flowing out from the discharge port 5. The motor power of the first air separator 2 is adjustable. The first processing device 4 includes a base plate 6 and a plurality of first baffles 7. The plurality of first baffles 7 are vertical and are arranged at intervals along the width direction of the base plate 6. A second baffle 8 is provided between two adjacent first baffles 7. A plurality of cutting blades 9 are provided on the second baffle 8. The cutting blades 9 are vertically arranged on two sides of the second baffle 8. The plurality of cutting blades 9 are arranged at intervals along the length direction of the second baffle 8. An angle α is formed between the length direction of the cutting blades 9 and the length direction of the second baffle 8, wherein 60°≤angle α≤90°. The first processing device 4 is equipped with a drive assembly 10, which drives the second baffle 8 to reciprocate along the width direction of the base plate 6, so that in a single reciprocating motion, the minimum distance between the cutting edge of the cutting blade 9 and the first baffle 7 on the corresponding side is a, where 1mm≤a≤1.5mm; and the maximum distance between the cutting edge of the cutting blade 9 and the first baffle 7 on the corresponding side is b, where 20mm≤b≤25mm. The first processing device 4 is located in the area below the first air separator 2, and the base plate 6 is inclined relative to the horizontal plane. The first processing device 4 is used to receive the tea stems screened by the first air separator 2. After the tea stems fall onto the first processing device 4, they can be cut by the cutting blade 9 and flow out of the first processing device 4 along the gap between the first baffle 7 and the second baffle 8. The second air separator 3 is used to air separate the tea material flowing out of the first processing device 4. The motor power of the second air separator 3 is adjustable.

[0022] Before drying the tea leaves, the tea grinder 103 typically involves the following steps: spreading out fresh leaves, chopping fresh leaves, steaming to kill the green, and cooling the loose tea. In the chopping step, the fresh leaves are usually cut into small pieces of about 3cm using machinery. After the tea leaves are cooled, a conveyor device 101 transports them to the uppermost conveyor belt 102 on the tea grinder 103. The screening device for matcha processing described in this application is located below the end of the conveyor device 101; that is, after being transported to a high point by the conveyor device 101, the cooled loose tea leaves fall into the feeding machine 1. Under the blowing of the first air separator 2, the tea leaves are sieved, causing pure leaves and fine stems with leaves to be blown relatively far apart, while pure coarse stems and coarse stems with leaves are blown relatively close together. The first processing device 4 receives the pure coarse stems and coarse stems with leaves that are blown relatively close together, collectively referred to as the initial sieved tea leaves. After the initial sieved tea leaves fall onto the first processing device 4, some of the initial sieved tea leaves are located in the area between the first baffle 7 and the second baffle 8, while some fall above the first baffle 7 or the second baffle 8 and do not fall into the first baffle 8. In the area between baffle 7 and the second baffle 8, when the drive assembly 10 drives the second baffle 8 to reciprocate along the width direction of the base plate 6, on the one hand, the reciprocating motion of the second baffle 8 can shake the initial sieved tea material falling above the second baffle 8, so that the initial sieved tea material falls into the area between the first baffle 7 and the second baffle 8 during the shaking process; on the other hand, the second baffle 8 drives the cutting blade 9 to move, and during the reciprocating motion of the second baffle 8, it ensures that there is a minimum distance 'a' between the blade of the cutting blade 9 and the corresponding side of the first baffle 7, and the minimum distance 'a' can reduce the blade's... The probability of being shredded, that is, in the area where the coarse stem with leaves is sandwiched between the first baffle 7 and the second baffle 8, based on the softness of the leaves after steam fixation and cooling, the minimum distance a reserves space for the leaves, making it difficult for the part of the leaves away from the tea stem to be cut off. The diameter of the coarse tea stem is usually about 3mm, which is smaller than the minimum distance a, so that the cutting blade 9 will cut the coarse tea stem to form a cut on the coarse tea stem. At the same time, the cutting blade 9 has a chance to cut the part of the coarse tea stem that is connected to the leaves, thereby having a chance to separate the leaves from the coarse tea stem.On the one hand, during the reciprocating motion of the second baffle 8 driven by the drive component 10, the drive component 10 itself is one of the main sources of vibration. Based on the connection between the drive component 10 and the base plate 6, the vibration of the drive component 10 can be transmitted to the base plate 6, causing the first processing device 4 to vibrate. Thus, since the base plate 6 is inclined relative to the horizontal plane, under the action of this vibration, it is more conducive for the tea material to move from high to low along the gap between the first baffle 7 and the second baffle 8, so as to facilitate the tea material to flow out from the first processing device 4. At this time, the tea material flowing out mainly includes leaves that have been separated from the tea stems, tea stems with leaves, and pure tea stems. The tea stems with leaves and pure tea stems are basically cut by the cutting blade 9 and form incisions. Then, under the air separation action of the second air separator 3, the leaves that have been separated from the tea stems can be blown relatively far away, and the coarse stems with leaves and pure coarse stems can be blown relatively close, so as to screen the tea material. Based on the above, when the screening device for matcha processing is arranged such that the airflow direction of the first air separator 2 is in the same direction as the movement direction of the upper surface of the uppermost conveyor belt 102 on the tea grinder 103, the point where coarse stems with leaves and pure coarse stems are blown onto the uppermost conveyor belt 102 is closer than the point where pure leaves and fine stems with leaves are blown onto the uppermost conveyor belt 102. Regarding the uppermost conveyor belt 102 on the tea grinder 103, after the coarse stems with leaves and pure coarse stems fall onto the uppermost conveyor belt 102, in subsequent processes, pure leaves and fine stems with leaves can fall onto the coarse stems with leaves and pure coarse stems that have already fallen onto the uppermost conveyor belt 102. Above the stems, pure leaves and thin stems with leaves can be laid on top of coarse stems with leaves and pure coarse stems. The coarse stems with leaves and pure coarse stems can form multiple cuts under the cutting action of the cutting blade 9. These cuts are more conducive to the evaporation of moisture from the coarse tea stems, thereby shortening the drying time difference between the coarse tea stems and the leaves or thin stems, so as to improve the uniformity of stem and leaf mixing and drying. At the same time, the tea material carried by the uppermost conveyor belt 102 on the tea grinding furnace 103 is the first part to be dried in the entire tea grinding furnace 103 drying process. The tea material has the highest moisture content. The coarse tea stems at the bottom layer are conducive to building a breathable framework, further reducing the chance of steaming and browning. Thus, by pre-screening the tea leaves before drying, and then processing the screened tea leaves through the first processing device 4, the uniformity of leaf mixing during subsequent drying can be improved, thereby reducing the adverse effects of coarse stems on the drying quality of matcha and thus improving the quality of matcha. Furthermore, the coarse tea stems in this application refer to tea stems with a diameter of 2.5 mm or more; based on the adjustable motor power of the first air separator 2 and the second air separator 3, it is convenient to control the distance the tea leaves are blown by the wind, and to ensure that the coarse stems with leaves or pure coarse stems screened by the first air separator 2 fall onto the first processing device 4; and the first air separator 2 and the second air separator 3 are both horizontal airflow air separators. The specific structure and working principle of the horizontal airflow air separator are existing technologies, so they will not be described in detail here. Furthermore, during the process of conveying tea materials by the conveying device 101, the running speed of the conveyor belt on the conveying device 101 can be controlled, thereby controlling the amount of tea materials fed into the feeding machine per unit time, and thus controlling the amount of tea materials falling from the discharge port per unit time. In this way, by reducing the amount of tea materials falling per unit time, it is possible to prevent the tea materials from falling onto the first processing device 4 in a pile-up manner, thereby facilitating the tea materials to fall onto the first processing device 4 in a scattered manner.

[0023] Example 2: Based on the technical solution of Example 1, further details are provided below. Figures 1-10 As shown, the drive assembly 10 includes a reciprocating motor 11 and a movable rod 12. Several second baffles 8 are connected to the movable rod 12. The reciprocating motor 11 is used to drive the movable rod 12 to reciprocate so that the second baffles 8 move back and forth along the width direction of the base plate 6.

[0024] Furthermore, the reciprocating motor 11 drives the movable rod 12 to reciprocate so that the second baffle 8 reciprocates along the width direction of the base plate 6. The reciprocating motor 11 can be a DC geared reciprocating motor 11. The specific structure and working principle of the DC geared reciprocating motor 11 are existing technologies and will not be described in detail here. The frequency of the reciprocating motor 11 can be 40~120 times / minute.

[0025] As a preferred embodiment, based on the above method, the inclination angle of the base plate 6 relative to the horizontal plane is β, wherein 5°≤β≤10°.

[0026] Furthermore, the angle is set to 5°≤β≤10° so that the tea leaves can slide along the inclined base plate 6, thereby facilitating the flow of the tea leaves from the first processing device 4.

[0027] As a preferred embodiment, based on the above method, the vertical distance between the cutting edge of the cutting blade 9 and the side of the second baffle 8 is h, where 3mm≤h≤6mm.

[0028] Furthermore, by ensuring that 3mm≤h≤6mm, the cutting blade 9 can reduce its influence on the tea stems sliding downward along the base plate 6 while cutting the tea stems, thereby improving the smoothness of the tea material sliding downward along the base plate 6.

[0029] In a preferred embodiment, based on the above method, the distance between any two adjacent first baffles 7 is equal, the distance between any two adjacent second baffles 8 is equal, and the distance between any two adjacent first baffles 7 and the distance between any two adjacent second baffles 8 are equal.

[0030] By limiting the distance between two adjacent first baffles 7 and the distance between two adjacent second baffles 8, it is possible to ensure that any second baffle 8 is in the same position between its corresponding two first baffles 7 when the drive assembly 10 drives several second baffles 8 to reciprocate.

[0031] Example 3: Based on the technical solution of Example 2, further details are provided below. Figure 1 , Figure 2 and Figure 4 As shown, it also includes a frame 13, on which the feeding machine 1, the first air separator 2, the second air separator 3 and the first processing device 4 are all mounted.

[0032] Furthermore, the arrangement of the frame 13 improves the ease of installation of the feeder 1, the first air separator 2, the second air separator 3, and the first processing device 4.

[0033] As a preferred embodiment, based on the above method, the feeding machine 1 is further described as having a funnel-shaped structure with an open top and a narrowed bottom.

[0034] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present invention, as well as all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. A screening device for matcha processing, characterized in that: It includes a feeding machine, a first air separator, a second air separator, and a first processing device. The feeding machine is used to receive tea materials conveyed by the conveyor belt. The feeding machine is equipped with a discharge port, from which the tea materials inside the feeding machine flow out. The first air separator is used to separate the tea materials flowing out of the discharge port. The motor power of the first air separator is adjustable. The first processing device includes a base plate and a plurality of first baffles. The plurality of first baffles are vertical and are arranged at intervals on the base plate along the width direction. A second baffle is provided between two adjacent first baffles. A plurality of cutting blades are provided on the second baffles. The cutting blades are vertically arranged on two sides of the second baffles. The plurality of cutting blades are arranged at intervals along the length direction of the second baffles. An angle α is formed between the length direction of the cutting blades and the length direction of the second baffles, wherein 60°≤angle α≤90°. The first processing device is equipped with a drive assembly, which drives the second baffle to reciprocate along the width direction of the base plate, so that in a single reciprocating motion, the minimum distance between the cutting edge of the cutting blade and the first baffle on the corresponding side is a, where 1mm≤a≤1.5mm; and the maximum distance between the cutting edge of the cutting blade and the first baffle on the corresponding side is b, where 20mm≤b≤25mm. The first processing device is located in the area below the first air separator, and the bottom plate is inclined relative to the horizontal plane. The first processing device is used to receive the tea stems screened by the first air separator. After the tea stems fall into the first processing device, they can be cut by the cutting blade and flow out of the first processing device along the gap between the first baffle and the second baffle. The second air separator is used to air separate the tea material flowing out of the first processing device. The motor power of the second air separator is adjustable. When the airflow direction of the first air separator is aligned with the movement direction of the upper surface of the top conveyor belt on the tea grinder, the point where coarse stems with leaves and pure coarse stems are blown onto the top conveyor belt is closer than the point where pure leaves and fine stems with leaves are blown onto the top conveyor belt. Regarding the top conveyor belt on the tea grinder, after the coarse stems with leaves and pure coarse stems fall onto the top conveyor belt, the subsequent process allows pure leaves and fine stems with leaves to fall on top of the coarse stems with leaves and pure coarse stems that have already fallen onto the top conveyor belt, thus allowing pure leaves and fine stems with leaves to be laid on top of the coarse stems with leaves and pure coarse stems. The laying of coarse tea stems at the bottom layer is beneficial for building a breathable framework.

2. The screening device for matcha processing as described in claim 1, characterized in that: The drive assembly includes a reciprocating motor and a movable rod. Several second baffles are connected to the movable rod. The reciprocating motor is used to drive the movable rod to reciprocate, so that the second baffles move back and forth along the width direction of the base plate.

3. The screening device for matcha processing as described in claim 2, characterized in that: The angle of inclination of the base plate relative to the horizontal plane is β, where 5°≤β≤10°.

4. The screening device for matcha processing as described in claim 3, characterized in that: The vertical distance between the cutting edge of the cutting blade and the side of the second baffle is h, where 3mm≤h≤6mm.

5. The screening device for matcha processing as described in claim 4, characterized in that: The distance between any two adjacent first baffles is equal, the distance between any two adjacent second baffles is equal, and the distance between any two adjacent first baffles and the distance between any two adjacent second baffles are equal.

6. The screening device for matcha processing as described in claim 5, characterized in that: It also includes a frame, on which the feeding machine, the first air separator, the second air separator and the first processing device are all mounted.

7. The screening device for matcha processing as described in claim 6, characterized in that: The feeding machine has a funnel-shaped structure with an open top and a narrow bottom.

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