Ball milling device for preparing sludge-based biochar defluorination material

Abstract

The invention discloses a ball milling device for preparing a sludge-based biochar defluorination material, and belongs to the technical field of green environmental protection. The grinding machine mainly comprises a mounting frame, a planet carrier, a grinding cylinder assembly and a center shaft, the planet carrier is rotationally mounted on the mounting frame, the grinding cylinder assembly comprises a rotary cylinder, a first cylinder body, a bottom plate and a second cylinder body, the rotary cylinder is rotationally arranged on the planet carrier, a planet gear is coaxially arranged on the rotary cylinder, a gear ring coaxial with the planet carrier is mounted on the mounting frame, and the planet gear is meshed and matched with the gear ring. The second cylinder body is located at the lower end of the rotary cylinder, the first cylinder body is arranged at the upper end of the rotary cylinder in a sliding mode in the axial direction of the rotary cylinder, the bottom plate is fixedly connected with the rotary cylinder and located on an opening in the lower end of the first cylinder body, and a plurality of screen holes are formed in the lower position of the peripheral side wall of the first cylinder body. And a connecting channel connected between the sieve holes and the inner cavity of the cylinder II is arranged on the rotary cylinder. According to the ball milling device for preparing the sludge-based biochar defluorination material, the operation efficiency can be improved.

Description

Technical Field

[0001] This invention relates to the field of green and environmental protection technology, specifically to a ball milling device for preparing sludge-based biochar defluorination materials. Background Technology

[0002] In the preparation of sludge-based biochar defluorination materials, ball milling is required to process the materials. To enhance the material's activity and defluorination performance, it is necessary to improve the pulverization effect of the ball milling process. This requires selecting grinding balls of appropriate diameter for mixing. However, large-diameter grinding balls, due to their larger inter-ball gaps, cannot impact small particles at a high frequency, thus requiring a long operation time. While small-diameter grinding balls can achieve a higher frequency of impact on small particles, the weak impact force of small-diameter grinding balls in the early stages of ball milling makes it difficult to effectively process larger particles, also increasing the operation time. In summary, the working efficiency of existing ball milling equipment needs to be improved.

[0003] Therefore, it is necessary to provide a new ball milling device for preparing sludge-based biochar defluorination materials. Summary of the Invention

[0004] Based on the aforementioned problems in the existing technology, the purpose of this invention is to provide a ball milling device for preparing sludge-based biochar defluorination materials, which can improve operational efficiency.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A ball milling device for preparing sludge-based biochar defluorination materials is provided, comprising a mounting frame, a planetary carrier, a milling cylinder assembly, and a central shaft. The planetary carrier is rotatably mounted on the mounting frame. The milling cylinder assembly includes a rotary cylinder, a first cylinder, a bottom plate, and a second cylinder. The rotary cylinder is located on the planetary carrier and offset from the axis of the planetary carrier. The rotary cylinder is rotatably mounted on the planetary carrier. A planetary gear is coaxially mounted on the rotary cylinder. A gear ring coaxial with the planetary carrier is mounted on the mounting frame. The planetary gear meshes with the gear ring. The central shaft is located coaxially with the planetary carrier. The first cylinder is located on the upper part of the rotary cylinder. The first cylinder is located at the lower end of the rotating cylinder, and the second cylinder is slidably disposed at the upper end of the rotating cylinder along the axial direction of the rotating cylinder. The bottom plate is fixedly connected to the rotating cylinder and is located on the lower opening of the first cylinder. Multiple sieve holes are provided on the peripheral side wall of the first cylinder at a lower position. The rotating cylinder is provided with a connecting channel connecting the sieve holes and the inner cavity of the second cylinder. When the first cylinder slides downward relative to the bottom plate to the first position, the sieve holes are covered by the bottom plate. When the first cylinder slides upward relative to the bottom plate to the second position, the sieve holes and the bottom plate are intersected. The sieve holes connect the inner cavity of the first cylinder and the outside of the first cylinder. The inner cavity of the first cylinder and the inner cavity of the second cylinder are connected by the connecting channel.

[0006] Furthermore, the rotary drum has a cylindrical structure, and the interior of the rotary drum is hollow to form a connecting cavity. There is a clearance between the inner peripheral wall of the rotary drum and the outer peripheral wall of the first cylinder body. The clearance connects the screen hole and the connecting cavity. The second cylinder body is a cylindrical structure with a closed bottom and an open top to form a material discharge port, which is connected to the connecting cavity.

[0007] Furthermore, the cylinder body is a cylindrical structure with openings at both the top and bottom. The peripheral wall of the bottom plate is provided with a barrier surface. The inner edge of the bottom opening of the cylinder body is sealed with the barrier surface and slidably engaged. Thus, when the cylinder body slides downward relative to the bottom plate to the first position, the barrier surface on the peripheral side of the bottom plate coincides horizontally with the sieve hole, separating the sieve hole from the inner cavity of the cylinder body. When the cylinder body slides upward relative to the bottom plate to the second position, the barrier surface on the peripheral side of the bottom plate and the sieve hole are staggered in the horizontal direction and do not coincide.

[0008] Furthermore, a cover plate is movably provided on the top opening of the cylinder, and the bottom end of the cover plate abuts against the top opening of the cylinder along the axial direction of the cylinder. At least two slots located on the same horizontal plane are provided on the peripheral side wall of the cylinder. The grinding cylinder assembly also includes a screw, and a top plate is vertically arranged and screwed on the screw. The top plate can be inserted into the slot, and when the screw moves helically to abut against the cover plate, the bottom end of the cover plate is held against the top opening of the cylinder.

[0009] Furthermore, an elastic element is installed between the bottom end of the cylinder and the base plate. The elastic element always applies an elastic force to the cylinder, causing it to slide upward away from the base plate. A top cover component is provided above the mounting frame, which can move closer to or further away from the mounting frame. When the top cover component moves downward towards the mounting frame, it presses against the upper end of the screw to resist the elastic force of the elastic element, forcing the cylinder to move downward and to the first position. When the top cover component is controlled to move upward away from the mounting frame, the downward pressure of the top cover component on the screw is released, so that the cylinder is driven upward to the second position under the elastic force of the elastic element.

[0010] Furthermore, the outer cylinder is sleeved on the outside of the second cylinder, and the outer cylinder is fixedly connected to the rotary cylinder. The second cylinder is movably housed in the outer cylinder, and the top end of the second cylinder abuts against the outer cylinder. At least two slots II located on the same horizontal plane are provided on the peripheral side wall of the outer cylinder. The grinding cylinder assembly also includes a screw II, and a top plate II is vertically arranged and screwed on the screw II. The top plate II can be inserted into the slots II, and when the screw II moves helically to the bottom end of the second cylinder, the top end of the second cylinder abuts against the outer cylinder.

[0011] The beneficial effects of this invention are as follows: The ball milling device for preparing sludge-based biochar defluorination materials provided by this invention includes a mounting frame, a planetary carrier, a milling cylinder assembly, and a central shaft. The planetary carrier is rotatably mounted on the mounting frame. The milling cylinder assembly includes a rotary cylinder, a first cylinder, a bottom plate, and a second cylinder. The rotary cylinder is located on the planetary carrier and offset from the axis of the planetary carrier. The rotary cylinder is rotatably mounted on the planetary carrier. A planetary gear is coaxially mounted on the rotary cylinder. A gear ring coaxial with the planetary carrier is mounted on the mounting frame. The planetary gear meshes with the gear ring. The central shaft is located coaxially with the planetary carrier. Thus, when the torsional force drives the central shaft to rotate, it can drive the rotary cylinder to rotate around the axis of the planetary carrier. While the center line revolves around the central axis, the rotating drum also rotates around its own axis. Cylinder 1 is located at the upper end of the rotating drum, and cylinder 2 is located at the lower end. Cylinder 1 is slidably positioned at the upper end of the rotating drum along its axial direction. The bottom plate is fixedly connected to the rotating drum and is located at the lower opening of cylinder 1. Multiple sieve holes are provided on the lower part of the circumferential wall of cylinder 1. The rotating drum has a connecting channel between the sieve holes and the inner cavity of cylinder 2. When cylinder 1 slides downwards relative to the bottom plate to the first position, the sieve holes are covered by the bottom plate; when cylinder 1 slides upwards relative to the bottom plate to the second position, the sieve holes intersect with the bottom plate, and the sieve holes connect to the inner cavity of cylinder 1. The ball milling device for preparing sludge-based biochar defluorination materials, provided in this embodiment of the invention, allows for the placement of relatively large-diameter grinding balls in the inner cavity of cylinder one and relatively small-diameter grinding balls in the inner cavity of cylinder two. Cylinder one is switched to the first position, and material is placed into its inner cavity. The material is first mixed and ground with the large-diameter grinding balls in the inner cavity of cylinder one. Due to the high impact force, the large-diameter grinding balls can quickly and effectively crush large particles. Then, cylinder one is switched to the second position, at which point the material in cylinder one will be connected through a channel. The material falls into the inner cavity of cylinder two, while the sieve holes block the grinding balls in cylinder one. The material enters and mixes and grinds with the small-diameter grinding balls in cylinder two. The small-diameter grinding balls achieve a higher frequency of impact on small particles, thereby quickly and effectively refining the material. Compared with the prior art, the technical solution provided by this invention uses grinding balls of different diameters in cylinder one and outer cylinder two for step-by-step grinding. This not only allows for the rapid and effective impact, shearing, and friction of the material with appropriately sized grinding balls in multiple stages, but also results in higher work efficiency compared to the prior art. Furthermore, it only requires one sieve of the material and grinding balls in cylinder two, without complicating the operation. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1This is a three-dimensional structural diagram of a ball milling device for preparing sludge-based biochar defluorination materials, provided in an embodiment of the present invention.

[0014] Figure 2 This is a front view of a ball milling apparatus for preparing sludge-based biochar defluorination materials, provided in an embodiment of the present invention.

[0015] Figure 3 For along Figure 2 Cross-sectional view along the EE direction.

[0016] Figure 4 This is a three-dimensional structural diagram of the grinding cylinder assembly provided in an embodiment of the present invention.

[0017] Figure 5 This is an exploded view of the grinding cylinder assembly provided in an embodiment of the present invention.

[0018] Figure 6 This is a front view of the grinding cylinder assembly provided in an embodiment of the present invention.

[0019] Figure 7 For along Figure 6 A cross-sectional view along the FF direction, showing the first working state of the grinding cylinder assembly.

[0020] Figure 8 for Figure 7 An enlarged schematic diagram of region A in the middle.

[0021] Figure 9 for Figure 7 The diagram shows a grinding cylinder assembly in its second operating state.

[0022] Figure 10 for Figure 9 Enlarged schematic diagram of region B in the middle.

[0023] The reference numerals in the figures are as follows: 1. Mounting frame; 2. Planetary carrier; 3. Grinding cylinder assembly; 31. Rotary cylinder; 311. Connecting cavity; 312. Planetary gear; 32. Cylinder body one; 321. Screen hole; 322. Cover plate; 323. Slot one; 33. Base plate; 331. Barrier surface; 332. Fixing frame; 34. Elastic element; 35. Cylinder body two; 351. Outer cylinder; 352. Material discharge port; 353. Slot two; 36. Screw one; 361. Top plate one; 362. Rotating head; 37. Screw two; 371. Top plate two; 38. Clearance gap; 39. Connecting channel; 4. Top cover component; 41. Rotating ring; 5. Central shaft. Detailed Implementation

[0024] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0025] It should be noted that when a component is referred to as "connected to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0028] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, a particular feature, structure, or characteristic may be combined in any suitable manner.

[0029] Please refer to Figures 1 to 10As shown, the ball milling apparatus for preparing sludge-based biochar defluorination materials provided by the present invention will now be described. This ball milling apparatus includes a mounting frame 1, a planetary carrier 2, a milling cylinder assembly 3, and a central shaft 5. The planetary carrier 2 is rotatably mounted on the mounting frame 1. The milling cylinder assembly 3 includes a rotary cylinder 31, a first cylinder 32, a base plate 33, and a second cylinder 35. The rotary cylinder 31 is located on the planetary carrier 2 and offset from the axis of the planetary carrier 2. The rotary cylinder 31 is rotatably mounted on the planetary carrier 2. A planetary gear 312 is coaxially mounted on the rotary cylinder 31. A gear ring 11 coaxial with the planetary carrier 2 is mounted on the mounting frame 1. The planetary gear 312 meshes with the gear ring 11. The central shaft 5 is... At the coaxial position of the planetary carrier 2, when the torsional force drives the central shaft 5 to rotate, it can drive the rotary cylinder 31 to revolve around the axis of the planetary carrier 2. At the same time, the rotary cylinder 31 will also rotate around its own axis. The first cylinder 32 is located at the upper end of the rotary cylinder 31, and the second cylinder 35 is located at the lower end of the rotary cylinder 31. The first cylinder 32 is slidably disposed at the upper end of the rotary cylinder 31 along the axial direction of the rotary cylinder 31. The bottom plate 33 is fixedly connected to the rotary cylinder 31 and is located on the lower opening of the first cylinder 32. Multiple sieve holes 321 are provided on the peripheral side wall of the first cylinder 32 and at a lower position. The rotary cylinder 31 is provided with a connecting channel 39 connecting the sieve holes 321 and the inner cavity of the second cylinder 35. Figure 8 As shown, when the cylinder 32 slides downward relative to the bottom plate 33 to the first position, the sieve holes 321 are blocked by the bottom plate 33; Figure 10As shown, when cylinder 32 slides upward relative to bottom plate 33 to the second position, i.e., the sieve holes 321 intersect with bottom plate 33, and the sieve holes 321 connect the inner cavity of cylinder 32 and the outside of cylinder 32, the inner cavity of cylinder 32 and the inner cavity of cylinder 35 are connected by connecting channel 39. This allows the ball milling device for preparing sludge-based biochar defluorination materials provided in this embodiment of the invention to place relatively large-diameter grinding balls in the inner cavity of cylinder 32 and relatively small-diameter grinding balls in the inner cavity of cylinder 35. When cylinder 32 switches to the first position and the material is placed in the inner cavity of cylinder 32, the material is first mixed and ground with the large-diameter grinding balls in the inner cavity of cylinder 32. Due to the large impact force, the large-diameter grinding balls can quickly and effectively crush large particles. Then, the cylinder 32 is switched to the second position. At this time, the material in the cylinder 32 falls into the inner cavity of the cylinder 35 through the connecting channel 39. At the same time, the sieve hole 321 blocks the grinding balls in the cylinder 32. The material enters and mixes and grinds with the small-diameter grinding balls in the cylinder 35. The small-diameter grinding balls achieve a higher frequency impact on the small particles, thereby quickly and effectively refining the material. Compared with the prior art, the technical solution provided by this embodiment of the invention grinds the material step by step with grinding balls of different diameters in the cylinder 32 and the cylinder 35. This not only allows for the rapid and effective impact, shearing, and friction of the material with grinding balls of appropriate size in multiple steps, but also improves the work efficiency compared with the prior art. Furthermore, it only requires one sieve of the material and grinding balls in the cylinder 35, without complicating the operation.

[0030] like Figure 3 and Figure 8 As shown, in some embodiments, the rotary drum 31 has a cylindrical structure, and the interior of the rotary drum 31 is hollow to form a connecting cavity 311. A clearance gap 38 is provided between the inner peripheral wall of the rotary drum 31 and the outer peripheral wall of the first cylinder 32. The clearance gap 38 connects the screen hole 321 and the connecting cavity 311. The second cylinder 35 is a cylindrical structure with a closed bottom and an open top to form a discharge port 352. The discharge port 352 connects to the connecting cavity 311, so that the clearance gap 38, the connecting cavity 311 and the discharge port 352 are sequentially connected to form at least a part of the connecting channel 39. The material in the inner cavity of the first cylinder 32 passes through the screen hole 321 under the action of gravity and then sequentially passes through the clearance gap 38, the connecting cavity 311 and the discharge port 352 into the inner cavity of the second cylinder 35.

[0031] like Figure 7 As shown, in some embodiments, the cylinder 32 has a cylindrical structure with openings at both the top and bottom, such as... Figure 8As shown, the peripheral wall of the base plate 33 is provided with a barrier surface 331. The inner edge of the bottom opening of the cylinder 32 is sealed and slidably engaged with the barrier surface 331, so that when the cylinder 32 slides downward relative to the base plate 33 to the first position, the barrier surface 331 on the peripheral side of the base plate 33 coincides horizontally with the sieve hole 321, thus separating the sieve hole 321 from the inner cavity of the cylinder 32; Figure 10 As shown, when the cylinder 32 slides upward relative to the bottom plate 33 away to the second position, the blocking surface 331 on the periphery of the bottom plate 33 and the sieve hole 321 are staggered in the horizontal direction and do not overlap, so that the sieve hole 321 connects to the inner cavity of the cylinder 32.

[0032] like Figure 7 As shown, in some embodiments, a cover plate 322 is movably provided on the top opening of the cylinder 32 so that materials can be fed into the cylinder 32 by opening the cover plate 322. Specifically, for example... Figure 4 As shown, the bottom end of the cover plate 322 abuts against the top opening of the cylinder 32 along the axial direction of the cylinder 32. The circumferential sidewall of the cylinder 32 is provided with at least two slots 323 located on the same horizontal plane. The grinding cylinder assembly 3 also includes a screw 36. A top plate 361 is vertically arranged and screwed onto the screw 36. The top plate 361 can be inserted into the slots 323. When the screw 36 moves helically to the point where it abuts against the cover plate 322, the bottom end of the cover plate 322 is held against the top opening of the cylinder 32, thereby locking the cover plate 322 onto the top opening of the cylinder 32.

[0033] like Figure 3 and Figure 7 As shown, the base plate 33 and the rotary drum 31 are connected by a fixing frame 332. Specifically, the fixing frame 332 is housed and fixedly installed in the communicating cavity 311 of the rotary drum 31. The fixing frame 332 is also fixedly connected to the bottom end of the base plate 33. The fixing frame 332 is a rod-intersection structure to reduce the space occupied by the fixing frame 332 in the communicating cavity 311 and reduce the flow resistance of the fixing frame 332 on the material.

[0034] like Figure 5 and Figure 8 As shown, in some embodiments, an elastic element 34 is installed between the bottom end of the cylinder 32 and the base plate 33. The elastic element 34 always applies an elastic force to the cylinder 32, causing the cylinder 32 to slide upward away from the base plate 33. Figure 3As shown, a top cover member 4 is provided above the mounting frame 1, which can move closer to or further away from the mounting frame 1. When the top cover member 4 is controlled to move downwards towards the mounting frame 1, it presses against the upper end of the screw 36 to resist the elastic force of the elastic member 34, forcing the cylinder 32 to move downwards and to a first position. When the top cover member 4 is controlled to move upwards away from the mounting frame 1, the downward pressure of the top cover member 4 on the screw 36 is released, causing the cylinder 32 to move upwards to a second position under the elastic force of the elastic member 34. It is understood that the top cover member 4 can, but is not limited to, make vertical linear movements relative to the mounting frame 1 through a linear sliding mechanism such as a hydraulic cylinder, pneumatic cylinder, or linear motor, or the top cover member 4 can swing up and down relative to the mounting frame 1.

[0035] like Figure 3 As shown, in some embodiments, in order to counteract the rotation and revolution of the cylinder 32 following the rotary cylinder 31, the bottom end of the top cover member 4 is provided with a rotating ring 41. When the top cover member 4 is pressed down on the screw 36, the axis of the rotating ring 41 coincides with the axis of the planetary carrier 2. The top end of the screw 36 is also equipped with a rotating head 362. The rotating head 362 rotates and contacts the rotating ring 41 around the axis of the rotary cylinder 31. Thus, when the top cover member 4 abuts against the screw 36, the revolution of the rotary cylinder 31 is counteracted by the rotation of the rotating ring 41, and the rotation of the rotary cylinder 31 is counteracted by the rotation of the rotating head 362, so as to avoid the top cover member 4 affecting the rotation and / or revolution of the rotary cylinder 31.

[0036] like Figure 7 As shown, in some embodiments, a cylindrical outer cylinder 351 is sleeved on the outside of the second cylinder 35. The outer cylinder 351 is fixedly connected to the rotary cylinder 31. The second cylinder 35 is movably housed in the outer cylinder 351. The top end of the second cylinder 35 abuts against the outer cylinder 351. At least two slots 353 located on the same horizontal plane are provided on the peripheral sidewall of the outer cylinder 351. The grinding cylinder assembly 3 also includes a screw 37. A top plate 371 is vertically arranged and screwed onto the screw 37. 371 can be inserted into the slot 353, and when the screw 37 moves spirally to the bottom of the cylinder 35, the top of the cylinder 35 is held against the outer cylinder 351, thus locking the cylinder 35 onto the outer cylinder 351. When the screw 37 is rotated downward and the top plate 371 is removed from the slot 353, the cylinder 35 can be moved downward out of the outer cylinder 351 so that materials / grinding balls can be output or input through the upper discharge port 352 of the cylinder 35.

[0037] In some embodiments, the ball milling apparatus for preparing sludge-based biochar defluorination materials provided by the present invention includes multiple milling cylinder assemblies 3, such as... Figure 1 As shown, in this embodiment, three grinding cylinder assemblies 3 are arranged in a circumferential array on the planetary carrier 2.

[0038] In some embodiments, the central shaft 5 is fixedly connected to the planet carrier 2. It is understood that in other embodiments not shown, the central shaft 5 is separate from the planet carrier 2 and the central shaft meshes with the planetary gear 312 in each grinding cylinder assembly 3.

[0039] In some embodiments, the minimum diameter of the sieve aperture 321 is smaller than the diameter of the grinding ball inside the cylinder 32.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A ball milling device for preparing a sludge-based biochar defluoridation material, characterized by: The application relates to a grinding cylinder assembly, which comprises a mounting frame, a planet carrier, a grinding cylinder assembly and a central shaft, the planet carrier is rotatably mounted on the mounting frame, the grinding cylinder assembly comprises a rotary cylinder, a cylinder body I, a bottom plate and a cylinder body II, the rotary cylinder is located on the planet carrier and deviates from the planet carrier axis, the rotary cylinder is rotatably arranged on the planet carrier, a planet gear is coaxially arranged on the rotary cylinder, a gear ring coaxial with the planet carrier is arranged on the mounting frame, the planet gear is in meshing cooperation with the gear ring, the central shaft is arranged on the planet carrier coaxially, the cylinder body I is arranged on the upper end of the rotary cylinder, the cylinder body II is located on the lower end of the rotary cylinder, the cylinder body I is slidably arranged on the upper end of the rotary cylinder along the axial direction of the rotary cylinder, the bottom plate is fixedly connected with the rotary cylinder, and the bottom plate is located on the lower end opening of the cylinder body I, a plurality of sieve holes are arranged on the lower position of the circumferential wall of the cylinder body I, a connecting channel is arranged on the rotary cylinder and connected between the sieve holes and the inner cavity of the cylinder body II, when the cylinder body I slides downward relative to the bottom plate to a first position, the sieve holes are shielded by the bottom plate, when the cylinder body I slides upward relative to the bottom plate to a second position, the sieve holes are staggered with the bottom plate, the sieve holes are connected with the inner cavity of the cylinder body I and the outside of the cylinder body I, and the inner cavity of the cylinder body I and the inner cavity of the cylinder body II are connected through the connecting channel.

2. The ball milling device for preparing sludge-based biochar defluoridation material according to claim 1, characterized in that: The rotary cylinder is in a cylindrical structure, the inside of the rotary cylinder is hollow to form a connecting cavity, a clearance is arranged between the inner circumferential wall of the rotary cylinder and the outer circumferential wall of the cylinder body I, the clearance is connected between the sieve holes and the connecting cavity, and the cylinder body II is in a cylindrical structure with a closed bottom end and an open top end forming a discharging port, the discharging port is connected with the connecting cavity.

3. The ball milling device for preparing sludge-based biochar defluoridation material according to claim 1, characterized in that: The cylinder body I is in a cylindrical structure with open top and bottom ends, a blocking surface is arranged on the circumferential wall of the bottom plate, the bottom end opening of the cylinder body I is in sealing and slidable cooperation with the blocking surface, so that when the cylinder body I slides downward relative to the bottom plate to the first position, the blocking surface on the circumferential wall of the bottom plate is horizontally overlapped with the sieve holes, the sieve holes are separated from the inner cavity of the cylinder body I, and when the cylinder body I slides upward relative to the bottom plate to the second position, the blocking surface on the circumferential wall of the bottom plate is staggered with the sieve holes in the horizontal direction so as to be not overlapped.

4. The ball milling device for preparing sludge-based biochar defluoridation material according to claim 3, characterized in that: A cover plate is movably arranged on the top end opening of the cylinder body I, the bottom end of the cover plate abuts against the top end opening of the cylinder body I along the axial direction of the cylinder body I, at least two clamping grooves I located on the same horizontal plane are arranged on the circumferential wall of the cylinder body I, the grinding cylinder assembly further comprises a screw rod I, a top plate I is vertically arranged on the screw rod I and in screwing cooperation, the top plate I can be inserted into the clamping groove I, and when the screw rod I is screwingly moved to abut against the cover plate, the bottom end of the cover plate is abutted against the top end opening of the cylinder body I.

5. The ball milling device for preparing sludge-based biochar defluoridation material according to claim 4, characterized in that: The bottom end of the cylinder one and the bottom plate are provided with elastic members, which always apply elastic force to the cylinder one to drive it to slide upward away from the bottom plate. The upper part of the mounting frame is provided with a top cover member which can move close to or away from the mounting frame, so that when the top cover member moves downward to close to the mounting frame, the top cover member is pressed on the upper end of the screw one to resist the elastic force of the elastic member to make the cylinder one move downward and be in the first position. When the top cover member moves upward away from the mounting frame, the downward pressure of the top cover member on the screw one is removed, so that the cylinder one is driven to move upward to the second position under the elastic force of the elastic member.

6. The ball milling device for preparing sludge-based biochar defluoridation material according to claim 1, characterized in that: The outer part of the cylinder two is provided with a cylindrical outer cylinder which is fixedly connected with the rotary cylinder. The cylinder two is movably accommodated in the outer cylinder, the top end of the cylinder two abuts against the outer cylinder, and the circumferential wall of the outer cylinder is provided with at least two clamping grooves two located on the same horizontal plane. The mill assembly further comprises a screw two, and a top plate two is vertically arranged on the screw two and is screw-connected. The top plate two can be inserted into the clamping grooves two, and when the screw two is screw-moved to abut against the bottom end of the cylinder two, the top end of the cylinder two abuts against the outer cylinder.

7. The ball milling device for preparing sludge-based biochar defluoridation material according to claim 5, characterized in that: The bottom end of the top cover member is provided with a swivel ring, and when the top cover member is pressed on the screw one, the axis of the swivel ring coincides with the axis of the planet carrier. The top end of the screw one is further provided with a rotating head which rotates in contact with the swivel ring around the axis of the rotary cylinder.

8. The ball milling device for preparing sludge-based biochar defluoridation material according to claim 1, characterized in that: The central shaft is fixedly connected with the planet carrier.

9. The ball milling device for preparing sludge-based biochar defluoridation material according to claim 1, characterized in that: The inner cavity of the cylinder one is provided with relatively large grinding balls, and the inner cavity of the cylinder two is provided with relatively small grinding balls.

10. The ball milling device for preparing sludge-based biochar defluoridation material according to claim 1, characterized in that: The minimum aperture of the screen hole is smaller than the diameter of the grinding balls in the cylinder one. The minimum aperture of the screen hole is smaller than the diameter of the grinding balls in the cylinder one.

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