A tea ball mill

Abstract

The application discloses a tea ball mill and belongs to the technical field of ball mills.The device comprises a rack, a turnover assembly, a ball milling assembly and a material returning assembly.The ball milling assembly is rotationally connected to the rack and comprises a return flow cylinder body and a ball milling cylinder body connected to each other, and a plurality of wedge-shaped protrusions are spirally arranged on the inner wall of the ball milling cylinder body;the material returning assembly is sleeved outside the ball milling cylinder body and is in communication with the return flow cylinder body, and has a material falling gap with the front end opening of the ball milling cylinder body;the return flow cylinder body is internally provided with a conveying structure for re-conveying materials.The buffering and force releasing of the wedge-shaped protrusions and the spiral arrangement avoid the centralized throwing and 90-degree rigid impact of materials in the prior art, reduce the impact load and alternating bending moment transmitted to the cantilever main shaft, and simultaneously utilize the external material returning assembly to receive and discharge materials, combine the tail conveying structure, form an axial reciprocating circulation path, and improve the safety and grinding efficiency of heavy-load equipment operation.

Description

Technical Field

[0001] This invention relates to the field of ball mill technology, and more particularly to a tea ball mill. Background Technology

[0002] Currently, ball mills are commonly used for the deep processing of tea powder. Among them, cantilever tea ball mills are widely used in the industry due to their unobstructed discharge port and relatively convenient feeding and unloading. Existing cantilever ball mills mainly consist of a single-end supported drive shaft that rotates the cantilever cylinder. To improve grinding efficiency, vertical cylindrical or straight baffles are usually welded at equal intervals along the circumference of the inner wall of the cylinder as lifting protrusions. During operation, the rotation of the cylinder causes the protrusions to lift the grinding balls inside to a high position, after which they fall freely. The physical shearing and pulverization of tea cells is achieved by the impact of gravity and the tumbling friction between the grinding balls.

[0003] However, existing cantilever tea ball mills typically employ a circumferentially aligned arrangement of internal lifting protrusions. When the mill operates, these protrusions lift the grinding balls and tea leaves to a certain height, after which a large amount of tea leaves and grinding balls fall due to their inertia. At this point, the falling grinding balls strike the protrusions located at the bottom of the mill. Because the traditional vertical protrusions impact the grinding balls at a 90-degree angle, this force not only accelerates metal wear on the protruding components but also transmits the impact load to the cantilever spindle. This causes the spindle to endure alternating bending moments over a long period, increasing the risk of metal fatigue and fracture.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not form prior art. Summary of the Invention

[0005] This invention provides a tea ball mill to solve the technical problems of existing cantilever ball mills, which suffer from equipment vibration caused by concentrated falling of grinding balls due to internal structural design limitations, and increased metal wear and spindle fatigue caused by right-angle impacts.

[0006] The present invention adopts the following technical solution: a tea ball mill. It includes a frame; A flipping component, mounted on the frame, is used to drive the ball mill assembly to rotate and flip as a whole; The ball mill assembly is rotatably connected to the frame and includes a rotatably disposed reflux cylinder and a ball mill cylinder. The ball mill cylinder is fixed to one end of the reflux cylinder and has an opening at the end away from the reflux cylinder. The inner wall of the ball mill cylinder is provided with a plurality of wedge-shaped protrusions spirally arranged in the circumferential direction to buffer and release the internal material during rotation and push it toward the opening. A return material assembly is sleeved outside the ball mill cylinder and communicates with the return cylinder, and there is a material discharge gap between the return material assembly and the opening. The return material assembly is used to receive the material discharged through the material discharge gap. The reflux cylinder is equipped with a conveying structure for conveying the material returned by the return component back into the ball mill cylinder, forming an axial reciprocating cycle with the wedge-shaped protrusion.

[0007] Furthermore, the return material assembly includes an outer cylinder, a sealing cover plate, and a return material channel. The outer cylinder is sleeved outside the ball mill cylinder, and one end of the outer cylinder is fixedly connected to the return cylinder. The opening and one end of the outer cylinder have the material discharge gap. The return material channel connects the outer cylinder and the return cylinder at the tail end, and is used to provide a channel for external material return.

[0008] Furthermore, the return material assembly also includes a discharge opening and a return material baffle. The discharge opening is located on the outer cylinder and corresponds to the material drop gap, and is used to receive the material discharged from the front end of the ball mill cylinder. The sealing cover is located at the front end of the outer cylinder. The return material baffle is semi-circular in design, fixed to the inner wall of the outer cylinder and located at the material drop gap, and designed to fit against one end of the ball mill cylinder. The return material baffle and the inner wall of one end of the outer cylinder form a receiving groove, which is used to collect and guide the material falling through the material drop gap, so as to prevent the material from falling disorderly to the front end during the drop.

[0009] Furthermore, the return channel includes an inlet section, a conveying section, and an inlet section. The inlet section, the conveying section, and the inlet section are connected and bent sequentially along the material flow direction. The inlet of the inlet section is connected to the receiving trough, and the outlet of the inlet section is connected to the return cylinder. The connection position between the inlet section and the outer cylinder is at the highest point of gravity when the cylinder rotates to the upper position. This is used to prevent the material from flowing backward, so as to guide the material in the conveying section to slide backward in one direction and enter the return cylinder through the inlet section.

[0010] Furthermore, the conveying structure is a spiral conveying blade, and the return material assembly also includes a feeding motor and a mounting cover. The feeding motor is fixed to the bottom of the inner wall of the return cylinder through the mounting cover, and the spiral conveying blade is fixed to the output end of the feeding motor and located inside the return cylinder, for pushing the returned material back into the ball mill cylinder.

[0011] Furthermore, the cross-section of the wedge-shaped protrusion has an asymmetrical structure, specifically including a long inclined surface and a short inclined surface. The long inclined surface serves as the grinding impact side, used to buffer and dissipate the force of the falling grinding balls, while the short inclined surface serves as the pushing and lifting side, used to lift and scatter the grinding balls and tea leaves to a high place.

[0012] Furthermore, the angle between the long inclined surface and the tangent direction of the inner wall of the ball mill cylinder is set to 30°~60°, which is used to convert the normal rigid impact when the grinding ball falls into tangential sliding friction along the inclined surface. The angle between the short inclined surface and the tangent direction of the inner wall of the ball mill cylinder is set to 70°~85°, which is used to overcome the dynamic angle of repose of the material, so as to ensure that the grinding ball and tea leaves are lifted to a high position and thrown.

[0013] Furthermore, the ball mill assembly also includes a cantilever support frame, a mounting frame, and a fixing frame. The two ends of the cantilever support frame are mounted on the frame via bearings. The mounting frame is fixed on the cantilever support frame. The fixing frame is rotatably mounted on the mounting frame via bearings, and the fixing frame is fixedly connected to the return cylinder body to support the rotation of the cantilever end.

[0014] Furthermore, the ball mill assembly also includes a grinding motor and a second chain drive unit. The grinding motor is fixed to the side of the mounting frame and is connected to the mounting frame via the second chain drive unit to drive the ball mill cylinder to perform rotational grinding.

[0015] Furthermore, the flipping assembly includes a mounting shell, a first chain drive unit, and an electrical control box. The mounting shell is fixed to the side of the frame, the first chain drive unit is located inside the mounting shell and is connected to the cantilever support frame for driving the cantilever support frame to rotate as a whole to adjust the working tilt angle, and the electrical control box is located on the frame.

[0016] The technical solutions adopted in the embodiments of the present invention can achieve the following beneficial effects: This invention discloses a tea ball mill. By spirally arranging several wedge-shaped protrusions along the circumferential inner wall of the mill cylinder, it overcomes the problem of concentrated material falling due to the equidistant alignment of protrusions in existing technologies. Instead, the lifted grinding balls and tea leaves are dispersed and continuously alternately dropped in space. Simultaneously, the wedge-shaped protrusions effectively buffer and dissipate the force of the falling internal material during cylinder rotation, avoiding the rigid 90-degree direct impact between the traditional vertical protrusions and the grinding balls. This reduces metal wear on the protrusion components themselves and decreases the concentrated impact load transmitted to the supporting spindle. This invention effectively solves the problem that existing cantilever spindles are prone to metal fatigue and fracture due to long-term exposure to extreme alternating bending moments. Furthermore, this invention utilizes a return material assembly sleeved on the outside of the ball mill cylinder to receive the material discharged through the material drop gap. Combined with the conveying structure built into the return cylinder, the externally returned material is fed back into the ball mill cylinder without the need to introduce internal through-type long shaft interference. With the thrust generated by the wedge-shaped protrusion, an axial reciprocating circulation path is formed, which not only ensures the high efficiency and uniformity of tea grinding, but also improves the overall operational safety and service life of the cantilever heavy-duty equipment. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention.

[0018] In the attached diagram: Figure 1 This is an overall schematic diagram of a tea ball mill according to this application; Figure 2 This is a schematic diagram of the tea ball mill in use according to an embodiment of the present invention; Figure 3 In this invention Figure 2 A partial sectional view of the structure; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A; Figure 5 In this invention Figure 3 A partial sectional view of the structure; Figure 6 In this invention Figure 3 A schematic diagram of a partial structure; Figure 7 In this invention Figure 6 A top-down view of the structure.

[0019] Figure label: 1. Frame; 2. Tilting assembly; 21. Mounting shell; 22. First chain drive unit; 23. Electrical control box; 3. Ball mill assembly; 31. Cantilever support frame; 32. Ball mill cylinder; 321. Wedge-shaped protrusion; 322. Long inclined plane; 333. Short inclined plane; 33. Mounting frame; 34. Fixing frame; 35. Return cylinder; 36. Grinding motor; 361. Second chain drive unit; 4. Return assembly; 41. Outer cylinder; 42. Sealing cover; 43. Return channel; 431. Inlet section; 432. Conveying section; 433. Merging section; 44. Return partition; 411. Discharge opening; 45. Feed motor; 451. Mounting cover; 46. Spiral conveyor blades. Detailed Implementation

[0020] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0021] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Reference Figures 1-7As shown, this embodiment provides a tea ball mill, including a frame 1; a tilting assembly 2, disposed on the frame 1, used to drive the ball mill assembly 3 to rotate and tilt as a whole; the ball mill assembly 3, rotatably connected to the frame 1, includes a rotatably disposed reflux cylinder 35 and a ball mill cylinder 32, the ball mill cylinder 32 is fixed to one end of the reflux cylinder 35, and the end away from the reflux cylinder 35 has an opening, the inner wall of the ball mill cylinder 32 is spirally provided with a plurality of wedge-shaped protrusions 321 along the circumferential direction, used to buffer and release the internal material during rotation and push it towards the opening; a return material assembly 4, sleeved on the outside of the ball mill cylinder 32 and connected to the reflux cylinder 35, and there is a material drop gap between the return material assembly 4 and the opening, the return material assembly 4 is used to receive the material discharged through the material drop gap; wherein, the reflux cylinder 35 is provided with a conveying structure, used to re-convey the material returned by the return material assembly 4 back into the ball mill cylinder 32, forming an axial reciprocating cycle with the wedge-shaped protrusions 321.

[0023] The overall working principle of this device is as follows: the material is placed inside the ball mill cylinder 32. When the equipment is running, the ball mill cylinder 32 and the wedge-shaped protrusions 321 inside rotate to grind the material and generate axial thrust to continuously push the material to the front opening. The material pushed to the opening falls into the outer return component 4 through the material drop gap and slides backward along the external channel into the tail return cylinder 35. Finally, the material is forcibly sent back into the ball mill cylinder 32 by the conveying structure inside the return cylinder 35, forming a closed loop reciprocating cycle, eliminating the risk of breakage of the central shaft due to the impact of the grinding balls. After grinding, the tilting component 2 drives the entire equipment to tilt and pour the material.

[0024] To achieve automated adjustment of equipment support and working posture, refer to the appendix. Figures 2-3 and Figures 5-6 As shown, the ball mill assembly 3 also includes a cantilever support frame 31, a mounting frame 33, and a fixing frame 34. The two ends of the cantilever support frame 31 are mounted on the frame 1 via bearings. The mounting frame 33 is fixed on the cantilever support frame 31. The fixing frame 34 is rotatably mounted on the mounting frame 33 via bearings. The fixing frame 34 is fixedly connected to the return cylinder 35 to support the rotation of the cantilever end. The return cylinder 35 has a rhomboid cross-section.

[0025] The ball mill assembly 3 also includes a grinding motor 36 and a second chain drive unit 361. The grinding motor 36 is fixed to the side of the mounting frame 33 and is connected to the fixed frame 34 through the second chain drive unit 361 to drive the ball mill cylinder 32 to perform rotational grinding.

[0026] The flipping assembly 2 includes a mounting shell 21, a first chain drive unit 22, and an electrical control box 23. The mounting shell 21 is fixed to the side of the frame 1. The first chain drive unit 22 is located inside the mounting shell 21 and is connected to the cantilever support frame 31 for driving the cantilever support frame 31 to rotate as a whole to adjust the working state. The electrical control box 23 is located on the frame 1.

[0027] In actual operation, the electrical control box 23 issues an automatic control command to start the grinding motor 36. Its power is transmitted through the second chain transmission unit 361, which drives the fixed frame 34 and the return cylinder 35 and the ball mill cylinder 32 in front of it to rotate under heavy load. When it is necessary to unload or change the grinding angle, the first chain transmission unit 22 is started, which drives the cantilever support frame 31 to tilt and deflect around the rotating shaft on the frame 1, thereby adjusting the posture of the equipment.

[0028] To achieve material crushing and circulating feeding, refer to the appendix. Figure 7 As shown, the wedge-shaped protrusion 321 has an asymmetrical cross-section, specifically including a long inclined surface 322 and a short inclined surface 333. The long inclined surface 322 serves as the grinding impact side, used to buffer and dissipate the force of the falling grinding balls. The short inclined surface 333 serves as the pushing and lifting side, used to lift and scatter the grinding balls and tea leaves to a higher position. The angle between the long inclined surface 322 and the tangent direction of the inner wall of the ball mill cylinder 32 is set to 30°~60°, used to convert the normal rigid impact of the falling grinding balls into tangential sliding friction along the inclined surface. The angle between the short inclined surface 333 and the tangent direction of the inner wall of the ball mill cylinder 32 is set to 70°~85°, used to lift the grinding balls and tea leaves to a higher position for scattering.

[0029] Furthermore, several wedge-shaped protrusions 321 are arranged in a spiral staggered manner on the inner wall of the ball mill cylinder 32 to change the inertial synchronous falling, so that the material forms an alternating and dispersed continuous falling in space.

[0030] During grinding, as the ball mill cylinder 32 rotates, the grinding balls and tea leaves at the bottom are lifted by the short inclined surface 333. Relying on its steep inclination angle of 70°~85°, the material is brought to the high position of the cylinder and then thrown down to impact, achieving pulverization efficiency. When the falling grinding balls hit the long inclined surface 322 at the bottom, the gentle slope angle of 30°~60° converts the vertical impact force into tangential friction, avoiding the 90-degree direct impact between the traditional vertical protrusion and the grinding ball, thereby reducing the concentrated impact load transmitted to the cantilever spindle and reducing metal fatigue and wear. At the same time, since the wedge-shaped protrusions 321 are arranged in a spiral staggered manner, the axial positive pressure generated by them during rotation continuously pushes the material towards the opening direction.

[0031] To achieve the collection and transitional flow of discharged materials, and to address the problem of fatigue fracture caused by the main shaft being subjected to alternating bending moments and rigid impacts from grinding balls over long periods, refer to the attached... Figures 3-5As shown, the return material assembly 4 includes an outer cylinder 41, a sealing cover plate 42, and a return material channel 43. The outer cylinder 41 is sleeved outside the ball mill cylinder 32, and one end of the outer cylinder 41 is fixedly connected to the return cylinder 35. The opening and one end of the outer cylinder 41 have a material drop gap. The return material channel 43 connects the outer cylinder 41 and the return cylinder 35 at the tail end, and is used to provide a channel for external material return.

[0032] The return material assembly 4 also includes a discharge opening 411 and two docking return material partitions 44. The discharge opening 411 is opened on the outer cylinder 41 and corresponds to the material drop gap position, and is used to receive the material discharged from the front end of the ball mill cylinder 32. The sealing cover plate 42 is located at the front end of the outer cylinder 41.

[0033] Two interlocking return material baffles 44 are fixed to the inner wall of the outer cylinder 41 and positioned at the material drop gap. They are designed to fit around one end of the ball mill cylinder 32 to seal the annular gap between the outer cylinder 41 and the ball mill cylinder 32, preventing material from accidentally entering the gap and causing material accumulation and jamming. The spliced ​​return material baffles 44 and the inner wall of one end of the outer cylinder 41 form a receiving groove, which is used to collect and guide the material passing through the material drop gap.

[0034] The return channel 43 includes an inlet section 431, a conveying section 432, and an inlet section 433. The inlet section 431, the conveying section 432, and the inlet section 433 are connected and bent in sequence along the material flow direction. The inlet of the inlet section 431 is connected to the receiving trough, and the outlet of the inlet section 433 is connected to the return cylinder 35. The connection position between the inlet section 431 and the outer cylinder 41 is at the highest point of gravity when the cylinder rotates to the upper position. This is used to prevent the material from flowing backward in the inlet section 431, so as to guide the material in the conveying section 432 to slide backward in one direction and enter the return cylinder 35 through the inlet section 433.

[0035] During the circulating feeding process, the material passes through the front opening of the ball mill cylinder 32 and falls into the receiving trough formed by the return material partition 44 and the end of the outer cylinder 41 through the material drop gap. The collected material enters the inlet section 431 of the return material channel 43. Since the entire return material assembly 4 rotates synchronously with the equipment, when the return material channel 43 rotates to the highest point, the connection between the inlet section 431 and the outer cylinder 41 is at the highest position, so that the material in the return material channel 43 continues to slide backward along the downward inclined conveying section 432 and smoothly enters the return cylinder 35 through the merging section 433.

[0036] Furthermore, considering the actual working condition where the outer cylinder 41 and the return channel 43 rotate synchronously with the ball mill assembly 3, to ensure that the material can be guided by gravity within the return channel 43, a maximum speed threshold is preset in the electrical control box 23 to limit the output speed of the grinding motor 36, so that the centrifugal acceleration of the outer cylinder 41 during rotation is less than the gravitational acceleration. When the equipment is running, when the return channel 43 rotates to the bottom position, the material in the receiving trough falls naturally into the inlet section 431 by gravity. When the return channel 43 rotates to the top position, the controlled rotation speed avoids excessive centrifugal force pressing the material against the channel wall, thereby ensuring that the material can slide backward along the inclined conveyor section 432 under the guidance of gravity, ensuring the smooth flow path of the return.

[0037] To achieve the re-entry and cyclic grinding of the reflux material falling into the reflux cylinder 35 into the ball mill cylinder 32, refer to the attached... Figures 5-7 As shown, the conveying structure is a spiral conveying blade 46. The return material assembly 4 also includes a feeding motor 45 and a mounting cover 451. The feeding motor 45 is fixed to the bottom of the inner wall of the return cylinder 35 through the mounting cover 451. The spiral conveying blade 46 is fixed to the output end of the feeding motor 45 and is located inside the return cylinder 35, used to push the returned material back into the ball mill cylinder 32.

[0038] When the material sliding down through the return channel 43 enters the return cylinder 35, the first chain drive unit 22 drives the entire ball mill assembly 3 to remain in a horizontal state during the grinding process. The return cylinder 35 has a rhomboid cross-section. The inclined inner wall formed by the rhomboid cross-section guides the material falling into the return cylinder 35 towards the spiral conveying blade 46 at the center. At this time, the feed motor 45 starts and drives the spiral conveying blade 46 to rotate at high speed. The material accumulated at the bottom is fed back into the feed end of the ball mill cylinder 32 by the spiral blade, thus completing the closed loop circulation.

[0039] As a preferred embodiment, considering the food safety and hygiene requirements of tea processing and the high-intensity friction under grinding conditions, all components that come into direct contact with the material, such as the ball mill cylinder 32, wedge protrusion 321, reflux cylinder 35, and return material assembly 4, are made of food-grade stainless steel (such as SUS304 or SUS316) to ensure that the tea powder is not contaminated by heavy metals and to guarantee the service life of the equipment.

[0040] The specific workflow is as follows: During the feeding and grinding stage, the operator puts the grinding balls and tea leaves into the ball mill cylinder 32 and locks the sealing cover 42. The electrical control box 23 issues a command to start the grinding motor 36, which drives the fixed frame 34 and the entire ball mill assembly 3 to rotate in a horizontal posture via the second chain transmission unit 361. When the ball mill cylinder 32 rotates, the material at the bottom inside is lifted by the short inclined surface 333 and thrown to a high position. The falling grinding balls hit the long inclined surface 322 at the bottom. The 30°~60° angle converts the normal rigid impact into tangential sliding friction, avoiding the 90-degree direct impact of the traditional protrusion, thereby reducing the concentrated impact load transmitted to the cantilever spindle. At the same time, the spiral staggered arrangement of the wedge-shaped protrusions 321 changes the inertial synchronous fall of the material, making the material disperse and fall alternately in space, further reducing the alternating bending moment on the spindle bearing, and relying on the axial positive pressure generated by the rotation to continuously push the material towards the front opening.

[0041] Material pushed to the front opening falls through the material drop gap into the receiving trough, which is formed by two butt-jointed return material baffles 44 and the inner wall of the outer cylinder 41. This butt-jointed structure seals the annular gap between the outer cylinder 41 and the ball mill cylinder 32, preventing material from accidentally entering and causing accumulation and jamming. The material in the receiving trough enters the inlet section 431 of the return material channel 43 as the equipment rotates synchronously. When the return material channel 43 rotates to the highest point as the whole, the connection port of the inlet section 431 is at the highest gravity position, preventing the material from flowing back and guiding the material to slide backward in one direction along the downward inclined conveying section 432, and finally enters the return cylinder 35 at the tail through the merging section 433.

[0042] The material entering the return cylinder 35 is guided by the inclined inner wall formed by its rhomboid cross-section structure, and gathers towards the center, avoiding material stagnation at the edges. Then, the feeding motor 45 starts, driving the spiral conveyor blades 46 to rotate, pushing the gathered material back into the feeding end of the ball mill cylinder 32, forming an axial reciprocating cycle. After the grinding process is completed, the grinding motor 36 stops, and the electrical control box 23 controls the first chain drive unit 22 to operate, driving the cantilever support frame 31 to tilt downward to the preset unloading angle (e.g., tilting downward from 45° to 90°). Then, the sealing cover plate 42 is opened, and the grinding motor 36 is started again at low speed, so that the remaining material in the ball mill cylinder 32 and the return assembly 4 is discharged under the action of gravity and spiral thrust, completing the overall operation.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A tea ball mill, characterized in that, include Rack (1); The flipping component (2) is mounted on the frame (1) and is used to drive the ball mill assembly (3) to rotate and flip as a whole; The ball mill assembly (3) is rotatably connected to the frame (1) and includes a rotatably disposed reflux cylinder (35) and a ball mill cylinder (32). The ball mill cylinder (32) is fixed at one end of the reflux cylinder (35) and has an opening at the end away from the reflux cylinder (35). The inner wall of the ball mill cylinder (32) is provided with a plurality of wedge-shaped protrusions (321) spirally arranged in the circumferential direction, which are used to buffer and release the internal material during rotation and push it towards the opening. The return material assembly (4) is sleeved outside the ball mill cylinder (32) and communicates with the return cylinder (35). The return material assembly (4) has a material drop gap between it and the opening. The return material assembly (4) is used to receive the material discharged through the material drop gap. The reflux cylinder (35) is provided with a conveying structure for conveying the material returned by the return material assembly (4) back to the ball mill cylinder (32) and forming an axial reciprocating cycle with the wedge protrusion (321).

2. The tea ball mill according to claim 1, characterized in that: The return material assembly (4) includes an outer cylinder (41), a sealing cover plate (42), and a return material channel (43). The outer cylinder (41) is sleeved outside the ball mill cylinder (32), and one end of the outer cylinder (41) is fixedly connected to the return cylinder (35). The opening and one end of the outer cylinder (41) have the material drop gap. The return material channel (43) connects the outer cylinder (41) and the return cylinder (35) at the tail end, and is used to provide a channel for external material return.

3. A tea ball mill according to claim 2, characterized in that: The return material assembly (4) further includes a discharge opening (411) and a return material partition (44). The discharge opening (411) is opened on the outer cylinder (41) and corresponds to the material drop gap position. It is used to receive the material discharged from the front end of the ball mill cylinder (32). The sealing cover plate (42) is located at the front end of the outer cylinder (41). The return material partition (44) is semi-circular in design, fixed to the inner wall of the outer cylinder (41) and located at the material drop gap position. It is designed to fit against one end of the ball mill cylinder (32). The return material partition (44) and the inner wall of one end of the outer cylinder (41) form a receiving groove, which is used to collect and guide the material falling through the material drop gap to prevent the material from falling disorderly to the front end when it drops.

4. A tea ball mill according to claim 2, characterized in that: The return channel (43) includes an inlet section (431), a conveying section (432), and an inlet section (433). The inlet section (431), the conveying section (432), and the inlet section (433) are connected in sequence with bending along the material flow direction. The inlet of the inlet section (431) is connected to the receiving trough, and the outlet of the inlet section (433) is connected to the return cylinder (35). The connection position between the inlet section (431) and the outer cylinder (41) is at the highest point of gravity when the cylinder rotates to the upper position. This is used to prevent the material from flowing backward in the inlet section (431), so that the material in the conveying section (432) slides backward in one direction and enters the return cylinder (35) through the inlet section (433).

5. A tea ball mill according to claim 1, characterized in that: The conveying structure is a spiral conveying blade (46). The return assembly (4) also includes a feeding motor (45) and a mounting cover (451). The feeding motor (45) is fixed to the bottom of the inner wall of the return cylinder (35) through the mounting cover (451). The spiral conveying blade (46) is fixed to the output end of the feeding motor (45) and located inside the return cylinder (35) to push the returned material back into the ball mill cylinder (32).

6. A tea ball mill according to claim 1, characterized in that: The cross-section of the wedge-shaped protrusion (321) has an asymmetrical structure, specifically including a long inclined surface (322) and a short inclined surface (333). The long inclined surface (322) serves as the grinding impact side, used to buffer and release the falling grinding balls. The short inclined surface (333) serves as the pushing and lifting side, used to lift and throw the grinding balls and tea leaves to a high place.

7. A tea ball mill according to claim 6, characterized in that: The angle between the long inclined surface (322) and the tangent direction of the inner wall of the ball mill cylinder (32) is set to 30°~60°, which is used to convert the normal rigid impact when the grinding ball falls into the tangential sliding friction along the inclined surface. The angle between the short inclined surface (333) and the tangent direction of the inner wall of the ball mill cylinder (32) is set to 70°~85°, which is used to overcome the dynamic rest angle of the material, so as to ensure that the grinding ball and tea leaves are lifted to a high position and dropped.

8. A tea ball mill according to claim 1, characterized in that: The ball mill assembly (3) also includes a cantilever support frame (31), a mounting frame (33), and a fixing frame (34). The two ends of the cantilever support frame (31) are mounted on the frame (1) by bearings. The mounting frame (33) is fixed on the cantilever support frame (31). The fixing frame (34) is rotatably mounted on the mounting frame (33) by bearings. The fixing frame (34) is fixedly connected to the return cylinder (35) to support the cantilever end to rotate.

9. A tea ball mill according to claim 8, characterized in that: The ball mill assembly (3) also includes a grinding motor (36) and a second chain drive unit (361). The grinding motor (36) is fixed to the side of the mounting frame (33). The grinding motor (36) is connected to the fixed frame (34) through the second chain drive unit (361) to drive the ball mill cylinder (32) to perform rotational grinding.

10. A tea ball mill according to claim 8, characterized in that: The flipping assembly (2) includes a mounting shell (21), a first chain drive unit (22), and an electrical control box (23). The mounting shell (21) is fixed to the side of the frame (1). The first chain drive unit (22) is located inside the mounting shell (21) and is connected to the cantilever support frame (31) for driving the cantilever support frame (31) to rotate as a whole to adjust the working state. The electrical control box (23) is located on the frame (1).

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