A tea leaf drum screening device

Abstract

The utility model discloses a kind of tea drum screening devices, the utility model relates to tea processing technical field, scheme includes: a kind of tea drum screening device, comprising: rack, rack is arranged along preset inclination angle;Multiple rolling support components, multiple rolling support components are distributed along the extension direction of rack;Classification drum, classification drum is provided with multiple classification sections along extension direction, the screening through-hole of multiple classification sections is sequentially increased along the extension direction of classification drum, classification drum is rotatably installed on multiple rolling support components;Driving main shaft, driving main shaft is through the inside of classification drum, the both ends of driving main shaft are rotatably connected with rack respectively;First motor, first motor is installed on rack, and the output end of first motor is connected driving main shaft;It can improve the contact probability of tea and sieve hole, to effectively reduce classification discreteness, improve screening precision and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of tea processing technology, specifically to a tea drum 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] According to the authorization announcement number (CN218282548U), a tea leaf grading machine has a core structure consisting of a base, a leaf-splitting roller, and a material collection box. The base serves as the basic load-bearing component, with the material collection box located at the top center. First and second support structures are respectively installed on both sides to provide stable support for the leaf-splitting roller. The leaf-splitting roller, as the core grading component, has at least three different mesh sizes to construct a continuous grading system. During the sieving process, the operator feeds the tea leaves into the hopper. Under the rotating conveyor of the leaf-splitting roller, the fresh leaves are sieved sequentially through the corresponding mesh sizes based on differences in leaf size, from smallest to largest, thus achieving grading of the fresh tea leaves according to their physical size characteristics.

[0004] The structure disclosed in this patent has defects in practical application, specifically as follows: When tea leaves are fed into the leaf-separating drum through the feed hopper, they naturally accumulate inside the drum due to gravity. During the rotation and conveying process, only the tea leaves close to the surface of the sieve holes make effective contact with the sieve holes and complete the sieving. The tea leaves on the upper part of the accumulation layer, lacking a turning mechanism, cannot fully contact the sieve holes and are conveyed downstream. This inadequacy in the sieving process makes it difficult to separate the tea leaves by size during grading, resulting in a discrete particle size distribution after grading. This makes it difficult to meet the strict requirements of consistent tea quality and standardized production, affecting grading efficiency and product quality stability. Utility Model Content

[0005] The purpose of this utility model is to provide a tea drum screening device, which addresses the problem in the prior art where the accumulation of tea leaves during the screening process prevents the upper layer of tea leaves from fully contacting the screen holes, resulting in large grading dispersion and low screening efficiency. This device can increase the probability of tea leaves contacting the screen holes, thereby effectively reducing grading dispersion and improving screening accuracy and efficiency.

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

[0007] A tea leaf drum sieving device includes: a frame arranged at a preset inclination angle; multiple rolling support components distributed along the extension direction of the frame; a grading drum having multiple grading sections along its extension direction, the sieving holes of the multiple grading sections increasing sequentially along the extension direction of the grading drum, the grading drum being rotatably mounted on the multiple rolling support components; a drive shaft penetrating the inner side of the grading drum, both ends of the drive shaft being rotatably connected to the frame; a first motor mounted on the frame, the output end of the first motor being connected to the drive shaft; multiple turning components distributed along the extension direction of the drive shaft, the turning components capable of turning the tea leaves in the corresponding grading sections; and a drive component capable of driving the grading drum to rotate.

[0008] Furthermore, in this utility model, the aforementioned turning assembly includes: a connecting sleeve, which is fitted onto the outside of the drive spindle; and multiple turning blades, which are installed on the outside of the connecting sleeve and distributed along the circumferential direction of the connecting sleeve. The turning blades are used to turn and toss the tea leaves in the corresponding screening section.

[0009] Furthermore, in this utility model, the connecting sleeve is equipped with multiple support bushings along the circumferential direction, and the multiple support bushings correspond one-to-one with multiple turning blades. The support bushings are fitted onto the outer side of the corresponding turning blades. The drive shaft has a hollow structure, and a push assembly is detachably installed on the inner side of the drive shaft. The turning blades slide and guide the support bushings, and the turning blades pass through the connecting sleeve and the drive shaft in sequence. At least part of the turning blades can extend to the inner side of the drive shaft. When the push assembly is installed, the push assembly can push the multiple turning blades to contact the inner side of the grading roller.

[0010] Furthermore, in this utility model, the aforementioned pushing assembly includes an actuating push rod and a limiting end cap; the cross-section of the flipping blade is polygonal, and one end of the flipping blade is provided with a guide slope; the outer contour of the actuating push rod is adapted to the inner contour of the drive spindle, and when the actuating push rod is pushed into the inner side of the drive spindle, the actuating push rod can push multiple flipping blades to contact the inner side of the grading roller through the guide slope; the limiting end cap is detachably connected to the end of the drive spindle, and the limiting end cap can limit the actuating push rod to the inner side of the drive spindle.

[0011] Furthermore, in this utility model, the inner side of the support bushing is provided with a guide groove along the extension direction, and a guide slider is installed on the outer side of the flipping blade. The guide slider is installed in the guide groove and can make linear reciprocating motion along the guide groove.

[0012] Furthermore, in this utility model, the aforementioned flipping blade includes a first telescopic drive section, a second telescopic drive section, and an elastic element; the bottom end of the second telescopic drive section is provided with a telescopic groove, and the first telescopic drive section is at least partially installed in the telescopic groove, with the first telescopic drive section slidingly guided in conjunction with the telescopic groove; the elastic element is disposed in the telescopic groove, one end of the elastic element is connected to the inner wall of the telescopic groove, and the other end of the elastic element is connected to the first telescopic drive section.

[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 grading roller, and the rolling rings are disposed between two corresponding support rollers, and the rolling rings and the two support rollers roll in cooperation.

[0014] Furthermore, in this utility model, the aforementioned 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 grading roller, 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. This utility model uses multiple sets of counter-rotating tumbling components to continuously agitate and toss the tea leaves in the grading drum using tumbling blades, effectively breaking up the tea leaf accumulation layer and allowing the tea leaves on the upper part of the accumulation layer to have sufficient contact with the sieve holes. Compared with the prior art, it can significantly increase the contact probability between the tea leaves and the sieve holes, and greatly improve the problem of insufficient sieving.

[0017] 2. In terms of equipment cleaning and maintenance, the hollow drive shaft of this utility model, in conjunction with the detachable push assembly, allows the flexible tumbling blades to abut against the inner wall of the grading drum, achieving efficient scraping and cleaning of the inner wall of the grading drum, preventing the mixing of different varieties of tea, while the flexible material avoids damage to the drum and extends the service life of the equipment. Attached Figure Description

[0018] 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:

[0019] Figure 1 A schematic diagram of a tea drum screening device;

[0020] Figure 2 This is a schematic diagram of the rack;

[0021] Figure 3 A schematic diagram of the spindle drive;

[0022] Figure 4 This is a cross-sectional view after the rotating blades are connected to the connecting sleeve;

[0023] Figure 5 This is a cross-sectional view after the first telescopic drive section and the second telescopic drive section are connected.

[0024] The attached diagram shows the markings and corresponding component names:

[0025] 1-Frame, 2-Grading roller, 3-Drive spindle, 4-First motor, 5-Roller bracket, 6-Support roller, 7-Second motor, 8-Transmission gear, 9-Rolling ring, 10-Gear ring, 11-Actuating push rod, 12-Limit end cover, 13-Support bushing, 14-Tilting blade, 15-Guide groove, 16-Guide slider, 17-Second telescopic drive section, 18-First telescopic drive section, 19-Guide inclined surface, 20-Telescopic groove, 21-Elastic element, 22-Connecting sleeve. Detailed Implementation

[0026] 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.

[0027] Example

[0028] Please refer to Figures 1 to 3This utility model provides a tea drum sieving device. It includes a frame 1, multiple rolling support components, a grading drum 2, a drive shaft 3, a first motor 4, multiple turning components, and a drive assembly. The frame 1 is arranged at a preset inclination angle, providing a stable support foundation for the entire device; the multiple rolling support components are distributed along the extension direction of the frame 1. The grading drum 2 has multiple grading sections along its extension direction, with the diameter of the sieving holes in each grading section increasing sequentially along the extension direction of the grading drum 2. One end of the grading drum 2 is a feed inlet, and the other end is a discharge outlet. When the operator adds tea leaves through the feed inlet, due to the inclined arrangement of the grading drum 2, the tea leaves are conveyed along the grading drum 2 towards the discharge outlet under the action of gravity. Simultaneously, the drive assembly drives the grading drum 2 to rotate, ensuring that the tea leaves fully contact the sieving holes as the grading drum 2 rotates. When tea leaves enter the first grading section, smaller-sized tea leaves are sieved out through the corresponding aperture. As the tea leaves continue to be conveyed into the second grading section, medium-sized tea leaves are sieved out, and so on, thus achieving the sieving of different grades of tea leaves. This allows tea leaves to be divided into different grades according to their particle size, improving the efficiency and accuracy of tea sieving.

[0029] It should be noted that when tea leaves are conveyed axially within the inclined grading drum 2, they tend to accumulate due to the material's buildup characteristics. This prevents the upper layer of tea leaves from effectively contacting the screening holes, creating a screening blind zone. To address this, multiple agitator components are evenly distributed along the extension direction on the outer side of the drive shaft 3. These components break up the accumulated tea leaf layer and throw it against the inner wall of the grading drum 2, allowing the upper layer of tea leaves to contact the screening holes. The blades of the agitator components are made of food-grade stainless steel with a mirror-polished surface, meeting hygiene standards and reducing the probability of tea leaf adhesion, further ensuring the stability of screening efficiency.

[0030] Please refer to Figure 3 In some embodiments of this application, the agitation assembly includes a connecting sleeve 22 and a plurality of agitating blades 14. The connecting sleeve 22 is coaxially fitted onto the outside of the drive shaft 3, and the connecting sleeve 22 and the drive shaft 3 are fixed by an interference fit. The plurality of agitating blades 14 are evenly distributed along the circumference of the connecting sleeve 22, and can agitate and toss the tea leaves within the corresponding screening sections.

[0031] When the first motor 4 drives the main shaft 3 to rotate, the connecting sleeve 22 rotates synchronously with the main shaft, thereby driving multiple agitator blades 14 to rotate. The rotation direction of the agitator blades 14 is opposite to the rotation direction of the grading drum 2. This reverse design can create a relative motion shearing effect: firstly, the multiple agitator blades 14 can break up the material accumulation layer inside the grading drum 2, throwing the upper tea leaves towards the screening holes on the inner wall of the drum; secondly, the multiple agitator blades 14 can cause the tea leaves to rub together, dispersing the agglomerated tea leaves and increasing the contact opportunity with the sieve holes, significantly improving the disturbance effect on the tea leaves. The agitator blades 14 have rounded edges to prevent damage to the tea buds and leaves.

[0032] Please refer to Figure 3 In some embodiments of this application, a plurality of support bushings 13 are installed circumferentially on the connecting sleeve 22, and each support bushing 13 corresponds one-to-one with a plurality of agitating blades 14. The support bushings 13 are coaxially fitted onto the outside of the agitating blades 14, limiting the circumferential swing of the agitating blades 14, while allowing the agitating blades 14 to extend and retract axially along the support bushings 13. The drive shaft 3 has a hollow structure, and a push assembly is detachably installed on the inner side of the drive shaft 3. The agitating blades 14 pass through the connecting sleeve 22 and the drive shaft 3 in sequence, extending at least partially into the inner side of the drive shaft 3. When the push assembly is installed inside the drive shaft 3, it can push the plurality of agitating blades 14 to contact the inner side of the grading roller 2.

[0033] Specifically, after the operator inserts the push assembly into the inner side of the drive spindle 3, the outer peripheral wall of the push assembly abuts against the extended end of the turning blade 14, causing the turning blade 14 to move axially along the support bushing 13 until the free end of the turning blade 14 adheres to the inner wall of the grading drum 2. This design is particularly suitable for cleaning the grading drum 2: the push assembly causes the turning blade 14 to abut against the inner wall of the drum, and then the drive spindle 3 drives the turning blade 14 to rotate. The edge of the turning blade 14 scrapes against the inner wall of the drum, effectively removing residual tea leaves. This cleaning mechanism can prevent residual tea leaves from being mixed in during the grading process of different varieties of tea, preventing cross-contamination of quality, and is especially suitable for production scenarios of continuous screening of multiple varieties of tea. The sliding guide structure of the support bushing 13 and the turning blade 14 adopts a clearance fit design, ensuring smooth blade extension and contraction while providing stable contact force during cleaning operations, taking into account both the turning function during screening operations and the scraping function during cleaning operations.

[0034] It should be noted that the agitator blades 14 are made of flexible materials (such as food-grade silicone or polyurethane), which not only ensures effective scraping of residual tea leaves on the inner wall of the grading roller 2, but also avoids rigid collisions with the roller through the elastic deformation of the material itself. This flexible design allows the agitator blades 14 to adapt to the irregular curved surface of the inner wall of the grading roller 2 as they rotate with the drive shaft 3, ensuring thorough cleaning without any blind spots. In addition, the surface smoothness of the flexible agitator blades 14 meets the hygiene standards for food processing equipment, reducing the probability of tea leaf debris adhesion and further improving cleaning efficiency, making it particularly suitable for screening scenarios with high requirements for tea quality.

[0035] Please refer to Figures 3 to 5 In some embodiments of this application, the pushing assembly consists of an actuating push rod 11 and a limiting end cap 12. The flipping blade 14 has a polygonal cross-section, and one end of the flipping blade 14 extending into the drive shaft 3 is provided with a guide slope 19. The outer contour of the actuating push rod 11 is adapted to the inner contour of the drive shaft 3. When the actuating push rod 11 is pushed into the drive shaft 3, the guide slope 19 can push multiple flipping blades 14 to move inward toward the grading roller 2. The limiting end cap 12 is detachably connected to the end of the drive shaft 3, used to limit and fix the actuating push rod 11 within the drive shaft 3.

[0036] Specifically, when the grading drum 2 needs cleaning, the operator inserts the actuator 11 into the inside of the drive spindle 3. Since the outer contour of the actuator 11 matches the inner contour of the drive spindle 3, during the advancement of the actuator 11, its surface contacts the guide slope 19 of the agitator blade 14. Utilizing geometric characteristics, the axial movement of the actuator 11 is converted into a radial pushing action of the agitator blade 14, causing the free end of the agitator blade 14 to abut against the inner wall of the grading drum 2. At this time, the limiting end cap 12 is fixed to the end of the drive spindle 3 via a threaded connection to prevent the actuator 11 from falling off and ensure that the agitator blade 14 remains in contact. Subsequently, the drive spindle 3 drives the agitator blade 14 to rotate, and the edge of the agitator blade 14 scrapes against the inner wall of the grading drum 2. Combined with the cushioning properties of the flexible material, this effectively removes residual tea leaves while avoiding damage to the drum surface.

[0037] It should be noted that the agitator blade 14 adopts a polygonal cross-section design. Correspondingly, the mating part of the agitator blade 14 that penetrates the connecting sleeve 22 and the drive shaft 3 also has a polygonal outline, forming a reliable circumferential limiting constraint. During equipment operation, the polygonal structure can effectively prevent the agitator blade 14 from rotating in the circumferential direction, ensuring that the guide slope 19 on the blade always maintains the preset orientation. Therefore, when the actuator push rod 11 is inserted into the inner side of the drive shaft 3, the surface of the actuator push rod 11 can contact and engage with the guide slope 19 of the agitator blade 14, reliably converting the axial thrust into the radial movement of the blade, thereby achieving stable contact between the agitator blade 14 and the inner wall of the grading roller 2.

[0038] Please refer to Figure 4 In some embodiments of this application, a guide groove 15 is provided axially on the inner side of the support bushing 13, and a guide slider 16 is correspondingly provided on the outer side of the agitator blade 14. The guide slider 16 and the guide groove 15 are assembled with a clearance fit, and the guide slider 16 can perform linear reciprocating motion along the guide groove 15. This guide structure design provides stable motion constraints for the agitator blade 14.

[0039] Please refer to Figure 5 The agitator blade 14 is composed of a first telescopic drive section 18, a second telescopic drive section 17, and an elastic element 21. The second telescopic drive section 17 has a telescopic groove 20 at its bottom end, and the first telescopic drive section 18 is at least partially inserted into this groove 20, forming a sliding guide engagement with the groove 20. The elastic element 21 is disposed within the groove 20, with its two ends connected to the inner wall of the groove 20 and the first telescopic drive section 18, respectively. The second telescopic drive section 17 has a sliding guide engagement with the support bushing 13, and the bottom end of the first telescopic drive section 18 has a guide slope 19.

[0040] When the actuator push rod 11 is inserted into the inner side of the drive spindle 3, the surface of the actuator push rod 11 contacts the guide inclined surface 19, pushing the first telescopic drive section 18 to move axially along the telescopic groove 20. At this time, the first telescopic drive section 18 compresses the elastic element 21, and the elastic force generated by the elastic element 21 is transmitted to the second telescopic drive section 17, thereby forming an abutment between the second telescopic drive section 17 and the inner wall of the grading roller 2. This elastic abutment design has an adaptive adjustment function: when there is local unevenness or slight deformation on the inner wall of the grading roller 2, the elastic element 21 can absorb the deviation through its own deformation, so that the second telescopic drive section 17 always maintains close contact with the inner wall of the grading roller 2, ensuring the uniformity of the scraping effect; at the same time, the buffering effect of the elastic element 21 can avoid damage to the inner wall of the grading roller 2 caused by rigid contact, extending the service life of the equipment.

[0041] Please refer to Figure 1In some embodiments of this application, the rolling support assembly includes two roller supports 5 symmetrically distributed on both sides of the frame 1, each roller support 5 having a support roller 6 rotatably mounted via a bearing. Multiple rolling rings 9 are correspondingly fitted onto the outer side of the grading roller 2, each rolling ring 9 located between two corresponding support rollers 6. The outer circumferential surface of the rolling ring 9 is in close contact with the rim of the support roller 6, forming a stable rolling contact pair. This double-sided symmetrical support structure, through the rolling engagement of the rolling rings 9 and the support rollers 6, effectively disperses the load during the operation of the grading roller 2, reduces the force on a single support point, and significantly improves the smoothness and coaxiality of the grading roller 2's rotation. Simultaneously, the rolling contact design greatly reduces frictional resistance, effectively reducing equipment operating energy consumption, minimizing component wear, and extending the overall service life of the equipment.

[0042] Please refer to Figure 1 In some embodiments of this application, the drive assembly consists of a second motor 7, a gear ring 10, and a transmission gear 8. The second motor 7 is fixedly mounted on the frame 1, and its output shaft is connected to the transmission gear 8. The gear ring 10 is coaxially fitted onto the outside of the grading roller 2, forming an external meshing transmission pair with the transmission gear 8. When the second motor 7 starts, the transmission gear 8 drives the gear ring 10 to rotate, thereby causing the grading roller 2 to rotate synchronously.

[0043] 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 leaf drum sifting apparatus, characterised 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); The grading roller (2) is provided with multiple grading sections along the extension direction. The screening holes of the multiple grading sections increase sequentially along the extension direction of the grading roller (2). The grading roller (2) is rotatably mounted on multiple rolling support assemblies. A drive spindle (3) passes through the inner side of the grading roller (2), and both ends of the drive spindle (3) are rotatably connected to the frame (1); The first motor (4) is mounted on the frame (1), and the output end of the first motor (4) is connected to the drive spindle (3); Multiple turning components are distributed along the extension direction of the drive shaft (3), and the turning components are capable of turning the tea leaves in the corresponding grading section; A drive assembly capable of driving the grading roller (2) to rotate.

2. The tea drum sifting device according to claim 1, characterized in that, The flipping component includes: A connecting sleeve (22) is fitted onto the outside of the drive spindle (3); Multiple agitator blades (14) are installed on the outside of the connecting sleeve (22). The multiple agitator blades (14) are distributed along the circumferential direction of the connecting sleeve (22). The agitator blades (14) are used to agitate and toss the tea leaves in the corresponding screening section.

3. A tea drum sifter apparatus according to claim 2, characterised in that, The connecting sleeve (22) is equipped with a plurality of support bushings (13) along the circumferential direction. The plurality of support bushings (13) correspond one-to-one with the plurality of turning blades (14). The support bushings (13) are fitted onto the outside of the corresponding turning blades (14). The drive spindle (3) has a hollow structure, and a push assembly is detachably installed on the inner side of the drive spindle (3); The tumbling blade (14) is slidably guided to the support bushing (13), the tumbling blade (14) passes through the connecting sleeve (22) and the drive shaft (3) in sequence, and the tumbling blade (14) can at least partially extend to the inside of the drive shaft (3); When the push assembly is installed, the push assembly is able to push the plurality of the tumbling blades (14) to contact the inside of the grading roller (2).

4. A tea drum sifter apparatus according to claim 3, characterised in that, The actuation assembly includes an actuation push rod (11) and a limiting end cap (12); The cross-section of the agitator blade (14) is polygonal, and a guide slope (19) is provided at one end of the agitator blade (14); The outer contour of the actuator push rod (11) is adapted to the inner contour of the drive spindle (3). When the actuator push rod (11) is pushed into the inner side of the drive spindle (3), the actuator push rod (11) can push multiple tumbling blades (14) to contact the inner side of the grading roller (2) through the guide inclined surface (19). The limiting end cap (12) is detachably connected to the end of the drive spindle (3), and the limiting end cap (12) can limit the actuator push rod (11) inside the drive spindle (3).

5. A tea drum sifting device according to claim 4, characterised in that, The inner side of the support bushing (13) is provided with a guide groove (15) along the extension direction, and the outer side of the flipping blade (14) is provided with a guide slider (16). The guide slider (16) is installed in the guide groove (15) and can make linear reciprocating motion along the guide groove (15).

6. A tea drum sifter apparatus according to claim 5, characterised in that, The agitating blade (14) includes a first telescopic drive section (18), a second telescopic drive section (17), and an elastic element (21); The bottom end of the second telescopic drive section (17) is provided with a telescopic groove (20), and the first telescopic drive section (18) is at least partially installed in the telescopic groove (20). The first telescopic drive section (18) and the telescopic groove (20) are slidably guided together. The elastic element (21) is disposed in the telescopic groove (20), one end of the elastic element (21) is connected to the inner wall of the telescopic groove (20), and the other end of the elastic element (21) is connected to the first telescopic drive section (18).

7. A tea drum sifter apparatus according to any one of claims 1 to 6, 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 grading roller (2) is fitted with a plurality of rolling rings (9), which are positioned between two corresponding support rollers (6) and roll in cooperation with the two support rollers (6).

8. A tea drum sifter apparatus according to any one of claims 1 to 6, characterized in that, The drive assembly includes a second motor (7), a gear ring (10), 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 (10) is fitted on the outside of the grading roller (2), and the gear ring (10) meshes with the transmission gear (8).

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