A biochar milling device
By designing a biochar grinding device with a dual-level grinding structure and an inverted frustum structure, the problem of grinding biochar in small-scale laboratories was solved, achieving efficient and low-energy-consumption biochar particle size refinement to meet the requirements of high specific surface area.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGAN UNIV
- Filing Date
- 2025-08-26
- Publication Date
- 2026-07-24
AI Technical Summary
In the existing technology, equipment such as ball mills, vertical mills and Raymond mills are not suitable for grinding small laboratory biochar, and it is difficult to achieve the particle size requirement of less than 0.075 mm. In addition, the light texture of biochar leads to a lot of dust during the grinding process, and traditional equipment has high energy consumption and low efficiency.
A biochar grinding device was designed, which adopts a dual-level grinding structure, including a first grinding body and a grinding table with opposite-opposite ...
This method achieves a biochar particle size of less than 0.075 mm, improving grinding efficiency and continuity, reducing power loss, simplifying the processing flow, and reducing dust generation.
Smart Images
Figure CN224541922U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of materials processing engineering, specifically to a biochar grinding device, which is particularly suitable for grinding lignin biochar and cellulose biochar generated from wood or agricultural and forestry solid waste biomass (because plants are mainly composed of lignin, cellulose and hemicellulose). Background Technology
[0002] Biochar is a carbon-rich solid material produced by the high-temperature pyrolysis of biomass under anaerobic or oxygen-limited conditions. Raw materials include wood and crop straw. In industry, it can be used as an adsorbent for wastewater and waste gas treatment, and also plays a role in energy storage electrode materials. Its soil-improving effects were discovered early on, and it is now widely used in agriculture, environmental management, and energy, making it a multifunctional material with both ecological and economic value. During processing, biochar needs to be ground into a fine powder to increase its specific surface area for easier use.
[0003] Common grinding methods include ball mills, vertical mills, and Raymond mills. However, none of these three methods are suitable for small-scale laboratory operations or the fine grinding of biochar. Small teaching laboratories require small-volume equipment with minimal floor space, and the amount of material ground per cycle is insufficient for industrial applications. Ball mills, on the other hand, have high energy consumption, long grinding cycles, and large equipment size, making them unsuitable for small laboratories. Vertical mills are generally suitable for large-scale production lines, but their efficiency and precision in processing ultrafine materials are inferior to dedicated equipment, making them unsuitable for small laboratories and unable to achieve particle sizes below 0.075mm. Raymond mills are ineffective at processing sticky or fibrous materials and are prone to malfunctions. Furthermore, biochar raw materials are lightweight, and the grinding process generates significant dust, making them unsuitable for fine biochar grinding.
[0004] In view of the above, this utility model is hereby proposed. Utility Model Content
[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a biochar grinding device for use in small-volume equipment in small laboratories, while achieving the requirement of grinding biochar to a particle size of less than 0.075 mm.
[0006] The objective of this utility model is achieved through the following technical solution: This utility model provides a biochar grinding device, including a cylindrical box with a hollow internal structure. The top of the cylindrical box has an opening and a feed inlet, and the bottom has a discharge outlet. It also includes a rotating rod. One side of the rotating rod is connected to the output shaft of a first motor installed at the top of the cylindrical box, and the other side passes through the opening and is located at the internal center of the cylindrical box. A first grinding body and a second grinding body are connected from top to bottom on the rotating rod and inside the cylindrical box. A grinding table is connected to the inner wall of the cylindrical box, and the grinding table is located on the lower outer side of the first grinding body. The lower side of the first grinding body and the inner surface of the grinding table are detachably connected to opposing first grinding plates. The lower side of the second grinding body and the inner surface of the cylindrical box are detachably connected to opposing second grinding plates.
[0007] Preferably, the cylindrical box has a diameter of 40-45cm and a height of 80-85cm.
[0008] Furthermore, the first grinding body is composed of a conical surface in the upper half connected to an inverted frustum in the lower half, and the first grinding plate is detachably connected to the side of the inverted frustum in the lower half via a connector. The grinding table is in the shape of an inverted frustum, with its upper end connected to the inner surface of the cylindrical box, and its lower end forming a channel with a spacing of 4~6mm with the lower end of the inverted frustum in the lower half.
[0009] Furthermore, the distance between the second grinding body and the cylindrical housing is 2~4mm.
[0010] Furthermore, the first grinding plate includes a first base plate, on the surface of which uniform oblique triangular prisms are arranged from bottom to top; the oblique triangular prisms of the first grinding plate on the side of the inverted frustum of the first grinding body are arranged in opposite directions and staggered with the oblique triangular prisms of the first grinding plate on the inner surface of the grinding table.
[0011] Furthermore, the cylindrical box body includes two hollow semi-cylindrical shells, one side of which is hinged and the other side is detachably connected.
[0012] Furthermore, the second grinding body is composed of a conical surface in the upper part connected to a cylindrical body in the lower part, and the second grinding plate is detachably connected to the outer circumferential surface of the cylinder through a connector.
[0013] Furthermore, the second grinding plate includes a second base plate, on the surface of which a plurality of connected rhomboid protrusions are uniformly arranged. The top of each rhomboid protrusion is a quadrilateral and the bottom is a rhombus, with a plurality of triangles between the bottom and the top.
[0014] Furthermore, the frustum protrusions of the second grinding plate on the outer circumferential surface of the second grinding body are arranged in opposite directions and staggered with the frustum protrusions of the second grinding plate on the inner surface of the cylindrical box.
[0015] Furthermore, a vibrating screen located at the bottom of the second grinding body is provided inside the cylindrical box.
[0016] Furthermore, multiple supporting tripods are evenly connected to the outer side of the cylindrical box.
[0017] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects: 1) The biochar grinding device provided in this embodiment performs preliminary grinding by setting a first grinding plate with opposite interlacing on the first grinding body and the grinding table, and performs secondary grinding by setting a second grinding plate with opposite interlacing on the inner wall of the second grinding body and the cylindrical box, forming a double-layer grinding structure. The gap between the two grinding stages is gradually reduced, which can gradually refine the biochar particles and effectively solve the problem that the particle size cannot reach below 0.075mm after grinding by traditional devices. The fine powder ground meets the requirement of high specific surface area.
[0018] 2) Because biochar raw materials are light in texture and generate a lot of dust during the grinding process, the grinding table and the first grinding body are designed as inverted truncated cones. The space between the two can accommodate the biochar raw materials, allowing them to be ground more thoroughly, thus solving the problem of poor grinding effect caused by the light texture of the raw materials generating a lot of dust.
[0019] 3) The rotating rod drives the first and second grinding bodies to rotate synchronously, reducing power loss and improving the continuity and efficiency of biochar grinding.
[0020] 4) Raw materials are introduced from the feed inlet and directly screened by the bottom vibrating screen after two-stage grinding. No additional transfer or separate equipment processing is required, which simplifies the processing flow of biochar from coarse to fine material. The screen mesh size of the vibrating screen can be flexibly changed according to the actual required biochar particle size. Attached Figure Description
[0021] The accompanying drawings are incorporated in and form part of this specification, and together with the description, serve to explain the principles of this invention.
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the biochar grinding device of this utility model; Figure 2 This is a schematic diagram of the internal structure of the biochar grinding device of this utility model; Figure 3 This is a schematic diagram of the connection of the vibrating screen of this utility model; Figure 4 This is a schematic diagram of the oblique triangular prism structure of the first grinding plate of this utility model; Figure 5 This is a schematic diagram of the two second grinding plates of this utility model being staggered in opposite directions (i.e.) Figure 2 (Enlarged view of point A in the middle) Figure 6 This is a schematic diagram of the rhomboid protrusion structure of the second grinding plate of this utility model. Figure 7 This is another structure for implementing the rhombus protrusion.
[0024] Wherein: 1 is a cylindrical box; 2 is the feed inlet; 3 is the discharge outlet; 4 is a rotating rod; 5 is the first motor; 6 is the first grinding body; 7 is the second grinding body; 8 is the grinding table; 9 is the first grinding plate; 10 is the second grinding plate; 11 is the tripod; 12 is the vibrating screen; 121 is the triangular support block; 122 is the screen mesh; 123 is the second motor. Detailed Implementation
[0025] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses consistent with some aspects of this invention as detailed in the appended claims.
[0026] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.
[0027] See Figures 1-7This utility model provides a biochar grinding device, including a hollow cylindrical box 1. The cylindrical box 1 is a vertical cylindrical structure with three supporting tripods 11 evenly welded to its outer side. The top of the cylindrical box 1 has an opening and a feed inlet 2, and the bottom has a discharge outlet 3. It also includes a rotating rod 4. A first motor 5 is fixedly installed at the center of the top of the cylindrical box 1 by bolts. The output shaft of the first motor 5 is fixedly connected to the upper end of the rotating rod 4 by a coupling. The lower end of the rotating rod 4 passes through the opening and is located at the center of the interior of the cylindrical box 1. 4. The first grinding body 6 is fixedly connected to the middle of the rotating rod 4, and the bottom is fixedly connected to the second grinding body 7. The first grinding body 6, the second grinding body 7 and the rotating rod 4 are coaxially arranged to form a synchronous rotation structure to achieve gradual grinding of biochar. The inner wall of the cylindrical box 1 is connected to the grinding table 8, and the grinding table 8 is located on the lower outer side of the first grinding body 6. The lower side of the first grinding body 6 and the inner surface of the grinding table 8 are detachably connected to the opposite first grinding plate 9. The lower side of the second grinding body 7 and the inner surface of the cylindrical box 1 are detachably connected to the opposite second grinding plate 10.
[0028] In this embodiment, the cylindrical box 1 has a diameter of 40-45cm and a height of 80-85cm.
[0029] like Figure 2 As shown, the first grinding body 6 is composed of a conical surface in the upper half connected to an inverted frustum in the lower half. The first grinding plate 9 is detachably connected to the side surface of the inverted frustum in the lower half via a connector. The grinding table 8 is a hollow inverted frustum with openings at the top and bottom, used to contain biochar and grind it. Its upper end is connected to the inner surface of the cylindrical box 1, and its lower end forms a channel with a spacing of 4~6mm with the lower end of the inverted frustum in the lower half.
[0030] Specifically, the first grinding body 6 can be integrally formed, or the upper and lower parts can be fixedly connected by welding.
[0031] In this embodiment, a ring of threaded holes is opened at the upper and lower parts of the first grinding plate 9 and the side surface of the inverted cone, and bolts are used to detachably connect the first grinding plate 9 and the inverted cone. The detachable connection method is not limited and can be other methods.
[0032] In this embodiment, the upper part of the conical surface is a smooth surface to facilitate feeding.
[0033] Furthermore, the distance between the second grinding body 7 and the cylindrical box body 1 is 2~4mm.
[0034] like Figure 4As shown, the first grinding plate 9 includes a first base plate, and the surface of the first base plate is uniformly arranged with oblique triangular prisms from bottom to top. The oblique triangular prisms of the first grinding plate 9 on the chamfered frustum side of the first grinding body 6 and the oblique triangular prisms of the first grinding plate 9 on the inner surface of the grinding table 8 are arranged in opposite directions and are staggered (not shown in the figure, the acute angle α of the upper oblique triangular prism is opposite to the acute angle α of the lower oblique triangular prism, which is equivalent to selecting two washboards, with one washboard facing up and the other washboard reversed 180 degrees and facing down to face the first washboard). The angle α between the acute angle of the oblique triangular prism and the first base plate is 30°~40°.
[0035] In this embodiment, the structural dimensions of the first grinding plate 9 are adapted to the structural dimensions of the object to which it can be detachably connected.
[0036] Furthermore, the cylindrical housing 1 includes two hollow semi-cylindrical shells, which are hinged on one side and detachably connected on the other side. Specifically, multiple threaded holes are made on the edges of both hollow semi-cylindrical shells. A connecting plate (steel plate) adapted to the curvature and height of the cylindrical housing 1 is placed at the connection point of the two hollow semi-cylindrical shells. Through holes or threaded through holes corresponding to the multiple threaded holes are made on the steel plate. Bolts are used to detachably connect the two hollow semi-cylindrical shells.
[0037] Furthermore, the second grinding body 7 is composed of a conical surface in the upper part connected to a cylindrical body in the lower part, and the second grinding plate 10 is detachably connected to the outer circumferential surface of the cylinder by bolts.
[0038] Specifically, the upper conical surface is fixedly connected to the lower end of the rotating rod 4. The second grinding body 7 can be integrally formed, or the upper and lower parts can be fixedly connected by welding.
[0039] In this embodiment, the upper half of the second grinding body 7 is a smooth conical surface, which facilitates the falling of particles.
[0040] like Figure 6 As shown, the second grinding plate 10 includes a second base plate. Multiple connected frustum protrusions are evenly distributed on the surface of the second base plate. Each frustum protrusion has a quadrilateral top and a rhombus bottom, with several triangles between the top and bottom. Specifically, at least 10 layers of connected frustum protrusions are arranged from top to bottom on the second base plate. Each row of frustum protrusions is staggered, meaning the acute angle vertex of the current row coincides with the midpoint of the side of the next row, avoiding the formation of continuous vertical gaps.
[0041] Optionally, the lateral cross-section of the truncated pyramid is a regular trapezoid. Figure 6 It can also be a slanted trapezoid ( Figure 7 That is, the convex protrusion of the rhombus can be perpendicular to the second base plate. Figure 6 ), or it can be at an angle ( Figure 7 ).
[0042] In this embodiment, the height of a single rhombus protrusion is 0.35~0.4mm, the height of two rhombus protrusions after they are staggered is 0.5~0.6mm, and the thickness of the second base plate is 1~1.5mm.
[0043] like Figure 6 As shown, the truncated pyramidal protrusions of the second grinding plate 10 on the outer circumferential surface of the second grinding body 7 are arranged in opposite directions and staggered with the truncated pyramidal protrusions of the second grinding plate 10 on the inner surface of the cylindrical box 1.
[0044] like Figure 3 As shown, the cylindrical housing 1 houses a vibrating screen 12 located at the bottom of the second grinding body 7. Specifically, the vibrating screen 12 includes four triangular support blocks 121, a screen 122, and a second motor 123. The sides of the triangular support blocks 121 are fixedly connected to the inner wall of the cylindrical housing 1, and the top of each triangular support block 121 has a threaded hole. The screen 122 is placed on top of the triangular support blocks 121 and fixed to them with bolts. The second motor 123 is connected to the bottom center of the screen 122 with bolts and nuts. The bolt connection allows for the replacement of screens with different apertures according to the required biochar particle size. The second motor 123 is a vertical vibrating motor, model YZUL-3-4. This technology is existing and will not be elaborated further; the key is to achieve vibration filtration.
[0045] Furthermore, the discharge port 3 is frustum-shaped, which facilitates the collection of the ground biochar.
[0046] The working process of the biochar grinding device of this invention is as follows: Biochar raw material (such as bagasse biochar) is fed into the feed inlet 2. After the bagasse biochar enters the cylindrical box 1, it falls naturally into the grinding area between the first grinding body 6 and the grinding table 8. At the same time, the first motor 5 starts and drives the rotating rod 4 to rotate, which in turn drives the first grinding body 6 and the second grinding body 7 to rotate. The friction and extrusion generated by the matching gap between the upper and lower opposing first grinding plates 9 enhances the cutting and crushing ability of the raw material, realizes repeated crushing, improves crushing efficiency, and completes the initial fine grinding of bagasse biochar. The initially ground particles fall to the second grinding body 7 under the influence of gravity. The conical surface at the top of the second grinding body 7 naturally guides the particles to slide towards the cylindrical part below it. The gap between the cylinder and the inner wall of the cylindrical box 1 is smaller than the initial grinding gap. Combined with synchronous rotation, this generates secondary friction. The closely distributed rhomboid protrusions of the second grinding plate 10 form cavities that can temporarily store excessively large particles. After the current layer is cut to a suitable size, the particles fall from the gaps (the connection points between the protrusions) into the rhomboid protrusions of the lower layer for further grinding, achieving graded (multi-stage) repeated crushing. The tilted direction of the rhomboid protrusions on the second grinding plate 10, from the upper left to the lower right, also causes the blocks to move clockwise upwards (using inclined rhomboid protrusions). Figure 7 The particles are further crushed repeatedly to ensure thorough grinding. Adjacent columns of inclined rhomboid protrusions are staggered to avoid forming continuous vertical gaps, preventing particles from passing directly without shearing and grinding, thus ensuring grinding effectiveness. The particles after secondary grinding fall into the bottom vibrating screen 12. During sieving, particles meeting the required particle size pass through the screen 122 and are discharged from the outlet 3. Coarse particles that do not meet the requirements remain in the vibrating screen 12 and can be recycled and reintroduced into the feed inlet 2 for further grinding, ensuring a uniform product with a particle size below 0.075 mm.
[0047] It should be noted that the first motor 5 has forward and reverse rotation functions, so the rotation direction of the motor can be adjusted during the grinding process to achieve efficient grinding.
[0048] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model.
[0049] It should be understood that this utility model is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.
Claims
1. A biochar grinding device, characterized in that, The device includes a cylindrical box (1) with a hollow interior. The top of the cylindrical box (1) has an opening and a feed inlet (2), and the bottom has a discharge outlet (3). It also includes a rotating rod (4). One side of the rotating rod (4) is connected to the output shaft of a first motor (5) installed at the top of the cylindrical box (1), and the other side passes through the opening and is located at the center of the interior of the cylindrical box (1). A first grinding body (6) and a second grinding body (7) are connected from top to bottom on the rotating rod (4) and inside the cylindrical box (1). A grinding table (8) is connected to the inner wall of the cylindrical box (1), and the grinding table (8) is located on the lower outer side of the first grinding body (6). The lower side of the first grinding body (6) and the inner surface of the grinding table (8) are detachably connected to opposing first grinding plates (9). The lower side of the second grinding body (7) and the inner surface of the cylindrical box (1) are detachably connected to opposing second grinding plates (10).
2. The biochar grinding apparatus according to claim 1, characterized in that, The first grinding body (6) is composed of a conical surface in the upper half and an inverted frustum in the lower half. The first grinding plate (9) is detachably connected to the outer circumferential surface of the inverted frustum in the lower half via a connector. The grinding table (8) is in the shape of an inverted frustum. Its upper end is connected to the inner surface of the cylindrical box (1), and its lower end forms a channel with a spacing of 4~6mm with the lower end of the inverted frustum in the lower half.
3. The biochar grinding apparatus according to claim 2, characterized in that, The distance between the second grinding body (7) and the cylindrical box body (1) is 2~4mm.
4. The biochar grinding apparatus according to claim 1, characterized in that, The first grinding plate (9) includes a first base plate, and uniform oblique triangular prisms are arranged on the surface of the first base plate from bottom to top; the oblique triangular prisms of the first grinding plate (9) on the side of the inverted frustum of the first grinding body (6) and the oblique triangular prisms of the first grinding plate (9) on the inner surface of the grinding table (8) are arranged in opposite directions.
5. The biochar grinding apparatus according to claim 1, characterized in that, The cylindrical box (1) includes two hollow semi-cylindrical shells, which are hinged on one side and detachably connected on the other side.
6. The biochar grinding apparatus according to claim 1, characterized in that, The second grinding body (7) is composed of a conical surface in the upper part connected to a cylindrical body in the lower part, and the second grinding plate (10) is detachably connected to the outer circumferential surface of the cylinder through a connector.
7. The biochar grinding apparatus according to claim 6, characterized in that, The second grinding plate (10) includes a second base plate. Multiple connected rhomboid protrusions are evenly arranged on the surface of the second base plate. The top of each rhomboid protrusion is a quadrilateral and the bottom is a rhombus. Several triangles are arranged between the bottom and the top.
8. The biochar grinding apparatus according to claim 6, characterized in that, The truncated pyramidal protrusions of the second grinding plate (10) on the outer circumferential surface of the cylinder of the second grinding body (7) are arranged in opposite directions and staggered with the truncated pyramidal protrusions of the second grinding plate (10) on the inner surface of the cylindrical box (1).
9. The biochar grinding apparatus according to claim 1, characterized in that, The cylindrical box (1) is equipped with a vibrating screen (12) located at the bottom of the second grinding body (7).
10. The biochar grinding apparatus according to claim 1, characterized in that, Multiple supporting tripods (11) are evenly connected to the outer side of the cylindrical box (1).