A tea leaf grading and screening device

Abstract

The utility model discloses a kind of tea grading screening devices, the utility model relates to tea processing technical field, scheme includes: a kind of tea grading screening device, it includes: rack;Multiple rolling support components, multiple rolling support components are distributed along the extension direction of rack;Screening drum, screening drum is rotatably installed on multiple rolling support components;Support main shaft, support main shaft is through the inside of screening drum, and the both ends of support main shaft are connected with rack respectively;Cleaning component, cleaning component is installed on support main shaft, and cleaning component can form adhering type scraping effect to the inner wall of screening drum, and the effective peeling of residual material is realized.The first drive component, the first drive component can drive cleaning component reciprocating movement along the extension direction of support main shaft;It can improve the cleaning effect of the inner wall of screening drum, to reduce the possibility of cross contamination in the screening process of different varieties of tea, help to guarantee the stability of product quality.

Description

Technical Field

[0001] This utility model relates to the field of tea processing technology, specifically to a tea grading and screening device. Background Technology

[0002] As a special agricultural product, tea's quality is influenced by many factors, including variety, origin, harvesting time, and processing techniques. Even within the same batch, tea can vary in shape, size, and internal composition. Sieving and grading, using techniques such as screening, winnowing, and color sorting, separates tea leaves based on physical characteristics such as appearance (e.g., tightness and uniformity of the leaves), particle size, color, and weight, while simultaneously removing impurities, stems, and non-tea components. Grading allows tea to meet market demands for different quality products and improves processing efficiency and standardization. It also makes blending, packaging, and storage more controllable, ensuring stable product quality and laying the foundation for quality-based pricing and brand management.

[0003] A rotary tea leaf sieving machine, disclosed in authorization announcement number (CN222197712U), comprises a support assembly, a roller assembly, a collection box assembly, and a shaking assembly. The roller assembly is fixedly mounted on top of the support assembly, and the collection box assembly is located at the bottom of the roller assembly. In practical application, the tea leaves to be sorted enter the feed pipe through the feeding port and are then conveyed into the sieving roller. Driven by a rotary motor, the sieving roller rotates continuously, causing the tea leaves to move along the direction of the sieving roller. During this movement, tea leaves of different sizes fall through the corresponding size filter holes on the surface of the sieving roller and finally fall into the collection box assembly below, achieving graded collection of the tea leaves.

[0004] The structure disclosed in this patent has defects in practical application, specifically as follows: During operation, fresh tea leaves easily become trapped on the inner wall of the sieving drum, forming stubborn residues. Due to the enclosed rotating structure of the sieving drum, conventional cleaning tools cannot reach all parts of the drum wall. Furthermore, the complex structure of the filter screen inside the sieving drum creates many dead zones, making it difficult to completely remove the residual tea leaves. If the residual material is not effectively cleaned, cross-mixing of new and old materials will be inevitable during subsequent sieving of different tea varieties, leading to product contamination and seriously affecting the stability and purity of the tea quality. Utility Model Content

[0005] The purpose of this utility model is to provide a tea grading and sieving device, which addresses the problem in the prior art where tea leaves easily remain on the inner wall of the sieving drum during the sieving process and are difficult to clean, leading to cross-contamination between different tea varieties and affecting product quality. The device provides a solution that improves the cleaning effect of the inner wall of the sieving drum, reduces tea residue, thereby reducing the possibility of cross-contamination between different tea varieties and helping to ensure the stability of product quality.

[0006] This utility model is achieved through the following technical solution:

[0007] A tea grading and screening device includes: a frame arranged at a preset inclination angle; multiple rolling support components distributed along the extension direction of the frame; a screening drum rotatably mounted on the multiple rolling support components; a support shaft penetrating the inner side of the screening drum, with both ends connected to the frame; a cleaning component mounted on the support shaft, capable of forming a close-fitting scraping action on the inner wall of the screening drum to effectively remove residual materials; a first drive component capable of driving the cleaning component to reciprocate along the extension direction of the support shaft; and a second drive component capable of driving the screening drum to rotate.

[0008] Furthermore, in this utility model, the cleaning component includes: a sliding sleeve, which is fitted on the outside of the supporting main shaft and can reciprocate along the extension direction of the supporting main shaft; and a plurality of wall-cleaning scrapers, which are installed on the outer wall of the sliding sleeve and are distributed along the circumferential direction, with the wall-cleaning scrapers extending to form a close fit with the inner wall of the screening drum.

[0009] Furthermore, in this utility model, the aforementioned wall cleaning scraper includes: a fixed base, the fixed base having a telescopic guide groove, the fixed base being mounted on a sliding sleeve; an elastic scraper arm, the elastic scraper arm being at least partially mounted in the telescopic guide groove, the elastic scraper arm slidingly guiding the telescopic guide groove; and an elastic element, the elastic element being disposed in the telescopic guide groove, one end of the elastic element being connected to the fixed base, and the other end of the elastic element being connected to the elastic scraper arm.

[0010] Furthermore, in this utility model, the end of the inner side of the screening drum is provided with a receiving ring groove; when the elastic scraper arm is housed in the receiving ring groove, the elastic element recovers its deformation from the compressed state, and the elastic element applies a reset pre-tightening force to the elastic scraper arm; both sides of the elastic scraper arm are provided with guide slopes, which can guide and cooperate with the receiving ring groove.

[0011] Furthermore, in this utility model, the aforementioned first drive assembly includes a transmission spindle, a first motor, a transmission collar, and a transmission connecting rod; the support spindle has a hollow tubular structure, and a transmission guide groove is formed on the side wall of the support spindle along the extension direction; the transmission spindle is rotatably mounted inside the support spindle, and the transmission spindle and the support spindle are arranged coaxially; the transmission collar is fitted on the outside of the transmission spindle, and the transmission collar and the transmission spindle are threaded together; the transmission connecting rod passes through the transmission guide groove, one end of the transmission connecting rod is connected to the transmission collar, and the other end of the transmission connecting rod is connected to the sliding sleeve; the first motor is mounted on the frame, and the output end of the first motor is connected to the transmission spindle.

[0012] Furthermore, in this utility model, elastic sealing bodies are installed on both sides of the transmission guide groove. The elastic sealing bodies are arranged along the extension direction of the transmission guide groove, and the two elastic sealing bodies abut against each other in their natural state to form a sealing structure.

[0013] Furthermore, in this utility model, the aforementioned rolling support assembly includes two roller brackets, which are distributed opposite to each other on both sides of the frame, and the roller brackets are rotatably mounted with support rollers; multiple rolling rings are fitted on the outer side of the screening drum, and the rolling rings are positioned between two corresponding support rollers, with the rolling rings and the two support rollers rolling in cooperation.

[0014] Furthermore, in this utility model, the aforementioned second drive assembly includes a second motor, a gear ring, and a transmission gear; the second motor is mounted on the frame, and the output end of the second motor is connected to the transmission gear; the gear ring is fitted onto the outside of the screening drum, and the gear ring meshes with the transmission gear.

[0015] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0016] 1. The wall-cleaning scraper of this application forms a close-fitting scraping with the inner wall of the screening drum. Combined with the reciprocating movement driven by the first drive component, it can thoroughly remove the tea leaves and impurities remaining on the inner wall of the screening drum, effectively prevent cross-contamination between different batches of tea leaves, and ensure the purity of the tea products.

[0017] 2. The combination of the elastic scraper arm, telescopic guide groove, and elastic element in this application allows the elastic scraper arm to adaptively extend and retract according to the actual conditions of the inner wall of the screening drum. Even if there are slight shape deviations or wear on the drum, it can ensure that the cleaning scraper fits tightly against the inner wall, achieving thorough cleaning. The ingenious design of the accommodating annular groove and guide slope not only avoids fatigue failure of the elastic element and extends the service life of the cleaning components, but also makes the switching between the cleaning scraper's storage and working states smoother and more stable, improving the reliability of equipment operation.

[0018] 3. The elastic seal of this application effectively prevents tea leaves from entering the support spindle, protecting key components such as the transmission spindle and transmission collar. In its natural state, the elastic seals abut against each other to form a sealing structure, and they can adaptively deform when the transmission linkage moves, ensuring that the area outside the location of the transmission linkage always maintains good sealing performance. This significantly reduces the risk of malfunctions caused by tea leaves entering the transmission system, and reduces the frequency and cost of equipment maintenance. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 A schematic diagram of a tea grading and sieving device;

[0021] Figure 2 This is a schematic diagram of the rack;

[0022] Figure 3 A schematic diagram showing the cleaning components mounted on the support spindle;

[0023] Figure 4 A sectional view supporting the main shaft;

[0024] Figure 5 This is a cross-sectional view of the wall cleaning scraper;

[0025] Figure 6 This is a cross-sectional view of the screening drum.

[0026] The attached diagram shows the markings and corresponding component names:

[0027] 1-Frame, 2-Screening roller, 3-First motor, 4-Supporting main shaft, 5-Roller bracket, 6-Support roller, 7-Second motor, 8-Transmission gear, 9-Transmission collar, 10-Transmission connecting rod, 11-Sliding sleeve, 12-Wall cleaning scraper, 13-Transmission main shaft, 14-Transmission guide groove, 15-Fixed base, 16-Elastic scraper arm, 17-Telescopic guide groove, 18-Elastic element, 19-Guide inclined surface, 20-Rolling ring, 21-Gear ring, 22-Accommodating ring groove. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0029] Example

[0030] Please refer to Figures 1 to 4This utility model provides a tea grading and sieving device. It mainly consists of a frame 1, multiple rolling support components, a sieving drum 2, a support shaft 4, a cleaning component, a first drive component, and a second drive component. The frame 1 is erected at a preset inclination angle, providing a spatial layout basis for the entire sieving process. This allows the tea to be automatically conveyed by gravity during sieving, reducing manual intervention and improving sieving efficiency. Multiple rolling support components are orderly distributed along the extension direction of the frame 1, serving as the rotation carrier for the sieving drum 2 and providing support and flexible rotation conditions. The sieving drum 2 is rotatably mounted on these rolling support components. The sieve holes inside the sieving drum 2 increase in size regularly along the extension direction. This structural design allows the tea leaves to be separated from the sieve holes of corresponding diameters according to their size during conveyance within the sieving drum 2, achieving grading and sieving of tea leaves of different grades.

[0031] The supporting main shaft 4 passes through the inner side of the screening drum 2, and both ends of the supporting main shaft 4 are firmly connected to the frame 1. The cleaning component is installed on the supporting main shaft 4. The cleaning component can form a close-fitting scraping action on the inner wall of the screening drum 2, effectively removing residual materials and avoiding tea residue from affecting screening accuracy and efficiency, ensuring that the screening drum 2 always maintains a good working condition. The first drive component can drive the cleaning component to move back and forth along the extension direction of the supporting main shaft 4, realizing all-round cleaning of the inner wall of the screening drum 2, reducing the tediousness and inconvenience of manual cleaning; the second drive component drives the screening drum 2 to rotate, causing the tea to continuously tumble and move inside the screening drum 2, increasing the contact opportunity between the tea and the screen holes, making the grading and screening more thorough and efficient.

[0032] In actual operation, the operator feeds the tea leaves into the screening drum 2 through the inlet. Driven by the second drive component, the screening drum 2 rotates continuously on the rolling support component. Under the combined action of gravity and the rotation of the screening drum 2, the tea leaves move along the screening drum 2 towards the outlet. During this process, tea leaves of different sizes pass through the corresponding apertures of the sieve in sequence, achieving grading and screening. The operator can arrange multiple collection devices under the frame 1 to collect the tea leaves screened from different positions, thereby obtaining tea products of different grades.

[0033] When it is time to screen the next variety of tea, the first drive component is activated, driving the cleaning component mounted on the support shaft 4 to reciprocate along the extension direction of the support shaft 4. The cleaning component makes close contact with the inner wall of the screening drum 2, thoroughly removing any remaining tea leaves and impurities from the previous variety, effectively avoiding cross-contamination between different varieties of tea, ensuring the purity and grading accuracy of the tea products screened subsequently, and laying the foundation for the next round of high-quality tea screening.

[0034] Please refer to Figure 3 and Figure 4In some embodiments of this application, the cleaning assembly mainly consists of a sliding sleeve 11 and multiple wall-cleaning scrapers 12. The sliding sleeve 11 is coaxially fitted onto the outside of the supporting main shaft 4, and the sliding sleeve 11 has the ability to reciprocate along the extension direction of the supporting main shaft 4, providing a motion carrier for cleaning the inner wall of the screening drum 2. The multiple wall-cleaning scrapers 12 are evenly installed on the outer wall of the sliding sleeve 11, and the multiple wall-cleaning scrapers 12 are distributed along the circumferential direction. The extension end of each wall-cleaning scraper 12 abuts against the inner wall of the screening drum 2, forming a tight fit, ensuring that there are no dead corners during the cleaning process and effectively covering the entire area of ​​the inner wall of the drum.

[0035] After the screening operation is completed, when it is necessary to switch the screening variety, the first drive component drives the sliding sleeve 11 to reciprocate linearly along the supporting main shaft 4. During this process, multiple wall-cleaning scrapers 12 installed on the sliding sleeve 11 move synchronously, and the wall-cleaning scrapers 12 thoroughly remove residual tea leaves and impurities by scraping. This circumferentially distributed scraper array design, combined with the reciprocating movement mechanism, can achieve all-round cleaning of the inner wall of the screening drum 2, avoiding residual tea leaves from contaminating subsequent screening operations or affecting screening accuracy, ensuring that the screening drum 2 remains clean when switching varieties, providing a reliable guarantee for the next stage of screening work, and significantly improving the professionalism of tea grading and screening and the stability of product quality.

[0036] Please refer to Figure 5 For example, the wall-cleaning scraper 12 mainly consists of a fixed base 15, an elastic scraper arm 16, and an elastic element 18, ensuring efficient cleaning of the inner wall of the screening drum 2. The fixed base 15 is provided with a telescopic guide groove 17, and the fixed base 15 is assembled to the outer wall of the sliding sleeve 11. Part of the structure of the elastic scraper arm 16 is embedded in the telescopic guide groove 17, and the elastic scraper arm 16 and the telescopic guide groove 17 form a sliding guide engagement. The elastic scraper arm 16 can reciprocate along the extension direction of the telescopic guide groove 17, realizing dynamic adjustment of the cleaning position.

[0037] The elastic element 18 is disposed inside the telescopic guide groove 17, and its two ends are connected to the fixed base 15 and the elastic scraper arm 16 respectively, forming an elastic buffer and adaptive adjustment system. During the cleaning of the inner wall of the screening drum 2, the elastic scraper arm 16 can adaptively extend or retract according to the actual shape and surface condition of the inner wall of the drum through the compression or extension of the elastic element 18. This design effectively compensates for the shape deviation of the inner wall of the screening drum 2 caused by manufacturing tolerances and wear during use, so that the elastic scraper arm 16 always maintains a good fit with the inner wall of the screening drum 2, ensuring powerful scraping of residual tea leaves and impurities. Even if the screening drum 2 has a slightly irregular surface, the elastic scraper arm 16 can fit tightly, avoiding cleaning blind spots and significantly improving the applicability and cleaning effect of the cleaning components.

[0038] Please refer to Figure 6The screening drum 2 has an inner end groove 22 for receiving the scraper. This groove 22 engages with the wall-cleaning scraper 12. The elastic scraper arm 16 has guide ramps 19 on both sides, which guide the scraper arm 16 into and out of the groove 22, ensuring smooth movement. During the tea screening process, once screening is complete, the operator controls the first drive assembly to move the sliding sleeve 11 towards the outlet of the screening drum 2. Multiple wall-cleaning scrapers 12 mounted on the sliding sleeve 11 move synchronously until the elastic scraper arm 16 reaches the groove 22. As the elastic scraper arm 16 enters the groove 22, the compressed elastic element 18 (compression spring) gradually recovers its shape, releasing accumulated elastic potential energy and applying a pre-tightening force to the scraper arm 16, causing it to fully retract into the groove 22. This design effectively prevents the elastic element 18 from being in a compressed state for a long time when it is not in operation, preventing the elastic element 18 from becoming fatigued and losing its elasticity or failing, thus significantly extending the service life of the elastic element 18 and ensuring the cleaning effect and reliability of the wall cleaning scraper 12.

[0039] During cleaning operations, the operator controls the first drive assembly to move the sliding sleeve 11 along the supporting main shaft 4 away from the outlet of the screening drum 2, causing the wall-cleaning scraper 12 to move out of the receiving annular groove 22. At this time, the guide slope 19 of the elastic scraper arm 16 forms a guiding engagement with the edge of the receiving annular groove 22. Under the push of the sliding sleeve 11, the interaction between the guide slope 19 and the edge of the receiving annular groove 22 generates a component force, causing the elastic scraper arm 16 to move along the telescopic guide groove 17 towards the fixed base 15, and the elastic element 18 is compressed accordingly. This structural design allows the elastic scraper arm 16 to move smoothly out of the receiving annular groove 22 under the guidance of the guide slope 19, avoiding component damage or movement jamming caused by rigid collision.

[0040] Please refer to Figure 1 , Figure 3 and Figure 4 In some embodiments of this application, the first drive assembly mainly consists of a transmission spindle 13, a first motor 3, a transmission collar 9, and a transmission connecting rod 10, realizing the linear reciprocating motion of the wall-cleaning scraper 12. The support spindle 4 is designed as a hollow tubular structure, and a transmission guide groove 14 is formed on the side wall of the support spindle 4 along the extension direction, thereby providing a guide path for the transmission connecting rod 10. The transmission spindle 13 can be rotatably mounted inside the support spindle 4 through bearings, and the transmission spindle 13 and the support spindle 4 maintain coaxiality to ensure the smoothness and reliability of the transmission process.

[0041] The transmission collar 9 is threaded onto the outside of the transmission main shaft 13, forming a helical transmission pair. One end of the transmission connecting rod 10 is connected to the transmission collar 9, and the other end passes through the transmission guide groove 14 and connects to the sliding sleeve 11, which can convert the rotational motion of the transmission collar 9 into linear motion. When the first motor 3 drives the transmission main shaft 13 to rotate, the transmission collar 9 can only perform linear reciprocating motion along the extension direction of the transmission main shaft 13 due to the limiting effect of the transmission connecting rod 10 and the transmission guide groove 14. This design enables the first drive assembly to convert the rotational power of the motor into the linear motion of the wall-cleaning scraper 12, achieving comprehensive cleaning of the inner wall of the screening drum 2.

[0042] It should be noted that the gap width of the transmission guide groove 14 is controlled within a very small range, forming an effective physical barrier. This design can reliably prevent tea particles from entering the support spindle 4 through the transmission guide groove 14. This not only avoids wear on the threaded pair between the transmission spindle 13 and the transmission collar 9 caused by tea particles, ensuring the accuracy and smoothness of the threaded transmission, but also prevents problems such as increased transmission resistance and increased motor load caused by the accumulation of tea inside the support spindle 4.

[0043] For example, to further enhance the sealing performance, elastic sealing bodies are fitted on both sides of the transmission guide groove 14, and these elastic sealing bodies are continuously arranged along the extension direction of the transmission guide groove 14. In the natural state, the elastic sealing bodies on both sides are tightly abutted to form a complete and tight sealing structure, effectively preventing tea particles from entering the channel inside the support spindle 4.

[0044] When the first drive assembly drives the transmission link 10 to move the sliding sleeve 11, the transmission link 10 compresses the elastic seals on both sides during its movement within the transmission guide groove 14. When compressed by the transmission link 10, the elastic seals undergo localized adaptive deformation, providing necessary space for the movement of the transmission link 10. After the transmission link 10 passes, the elastic seals quickly return to their original shape, maintaining a tight contact and ensuring good sealing performance in areas other than where the transmission link 10 is located. This elastic sealing design not only effectively prevents tea leaves from entering the support spindle 4, avoiding wear or jamming of key components such as the transmission spindle 13 and transmission sleeve 9, thus ensuring the stability and reliability of the threaded transmission system, but also significantly reduces the risk of malfunctions caused by tea leaves entering the transmission structure, reducing equipment maintenance frequency and costs.

[0045] Specifically, the elastic seal can be made of materials with high elasticity, wear resistance, and anti-aging properties, such as silicone rubber, EPDM rubber, or polyurethane elastomer. These materials have good flexibility and resilience, and can quickly return to their original shape after the transmission connecting rod 10 is compressed and deformed, continuously maintaining the sealing effect and ensuring that tea particles cannot enter the interior of the support spindle 4, effectively protecting the transmission components from wear.

[0046] Please refer to Figure 1 and Figure 2 In some embodiments of this application, the rolling support assembly adopts a double-wheel opposing support structure design, consisting of two roller supports 5 oppositely distributed on both sides of the frame 1 and a support roller 6 rotatably mounted on them. Multiple rolling rings 20 are fitted onto the outer side of the screening drum 2, with each rolling ring 20 correspondingly positioned between two support rollers 6. This design enables the rolling rings 20 and the support rollers 6 to roll together, effectively reducing frictional resistance during the rotation of the screening drum 2, lowering power loss, and improving equipment operating efficiency. Simultaneously, the symmetrical support structure of the double support rollers 6 can evenly distribute the weight of the screening drum 2 and the vibration load during operation, reducing stress concentration on various components of the equipment and extending its service life.

[0047] Please refer to Figure 1 and Figure 2 In some embodiments of this application, the second drive assembly consists of a second motor 7, a gear ring 21, and a transmission gear 8, providing power output for the stable operation of the screening drum 2. The second motor 7 is fixed to the frame 1, and its output end is connected to the transmission gear 8. The gear ring 21 is tightly fitted onto the outside of the screening drum 2, and the gear ring 21 and the transmission gear 8 form a meshing transmission relationship, establishing a stable power transmission path. When the second motor 7 starts, it transmits power to the gear ring 21 through the transmission gear 8. Since the gear ring 21 is tightly connected to the screening drum 2, it drives the screening drum 2 to rotate.

[0048] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A tea grading and sieving device, characterized in that, include: A frame (1) is arranged along a preset tilt angle; Multiple rolling support assemblies are distributed along the extension direction of the frame (1); Screening drum (2), which is rotatably mounted on a plurality of the rolling support assemblies; A supporting main shaft (4) is provided, which passes through the inner side of the screening drum (2), and the two ends of the supporting main shaft (4) are respectively connected to the frame (1); The cleaning component is installed on the supporting main shaft (4). The cleaning component can form a close-fitting scraping action on the inner wall of the screening drum (2) to effectively remove residual materials. A first drive component is capable of driving the cleaning component to reciprocate along the extension direction of the support spindle (4); The second drive assembly is capable of driving the screening drum (2) to rotate.

2. The tea grading and sieving device according to claim 1, characterized in that, The cleaning components include: A sliding sleeve (11) is fitted onto the outside of the support main shaft (4), and the sliding sleeve (11) can reciprocate along the extension direction of the support main shaft (4); Multiple wall cleaning scrapers (12) are installed on the outer wall of the sliding sleeve (11). The multiple wall cleaning scrapers (12) are distributed in the circumferential direction and extend to form a close fit with the inner wall of the screening roller (2).

3. The tea grading and sieving device according to claim 2, characterized in that, The wall cleaning scraper (12) includes: A fixed base (15) is provided with a telescopic guide groove (17), and the fixed base (15) is installed on the sliding sleeve (11); An elastic scraper arm (16) is at least partially installed in the telescopic guide groove (17), and the elastic scraper arm (16) and the telescopic guide groove (17) are slidably guided together. An elastic element (18) is disposed in the telescopic guide groove (17). One end of the elastic element (18) is connected to the fixed base (15), and the other end of the elastic element (18) is connected to the elastic scraper arm (16).

4. The tea grading and sieving device according to claim 3, characterized in that, The end of the inner side of the screening drum (2) is provided with a receiving annular groove (22); When the elastic scraper arm (16) is housed in the receiving annular groove (22), the elastic element (18) recovers its deformation from the compressed state, and the elastic element (18) applies a reset preload force to the elastic scraper arm (16); Both sides of the elastic scraper arm (16) are provided with guide slopes (19), which can guide and cooperate with the receiving annular groove (22).

5. The tea grading and sieving device according to any one of claims 2 to 4, characterized in that, The first drive assembly includes a transmission spindle (13), a first motor (3), a transmission collar (9), and a transmission connecting rod (10); The supporting spindle (4) has a hollow tubular structure, and the side wall of the supporting spindle (4) is provided with a transmission guide groove (14) along the extension direction; The transmission spindle (13) is rotatably mounted inside the support spindle (4), and the transmission spindle (13) and the support spindle (4) are arranged coaxially. The transmission collar (9) is fitted onto the outside of the transmission main shaft (13), and the transmission collar (9) and the transmission main shaft (13) are connected by threads; The transmission link (10) passes through the transmission guide groove (14), one end of the transmission link (10) is connected to the transmission collar (9), and the other end of the transmission link (10) is connected to the sliding sleeve (11). The first motor (3) is mounted on the frame (1), and the output end of the first motor (3) is connected to the transmission spindle (13).

6. The tea grading and sieving device according to claim 5, characterized in that, Both sides of the transmission guide groove (14) are equipped with elastic sealing bodies. The elastic sealing bodies are arranged along the extension direction of the transmission guide groove (14). The two elastic sealing bodies abut against each other in their natural state to form a sealing structure.

7. The tea grading and sieving device according to any one of claims 1 to 4, characterized in that, The rolling support assembly includes two roller brackets (5), which are distributed opposite to each other on both sides of the frame (1), and the roller brackets (5) are rotatably mounted with rollers (6); The outer side of the screening drum (2) is fitted with a plurality of rolling rings (20), which are positioned between two corresponding support rollers (6) and are in rolling engagement with the two support rollers (6).

8. The tea grading and sieving device according to any one of claims 1 to 4, characterized in that, The second drive assembly includes a second motor (7), a gear ring (21), and a transmission gear (8); The second motor (7) is mounted on the frame (1), and the output end of the second motor (7) is connected to the transmission gear (8); The gear ring (21) is fitted on the outside of the screening drum (2), and the gear ring (21) meshes with the transmission gear (8).

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