A dispersion sand mill for preparing carbon nanotube powder slurry

Abstract

The utility model relates to nanometer material dispersion equipment technical field especially, a kind of dispersion sand mill for carbon nanotube powder slurry preparation, including tripod, the top of the tripod is provided with sealing cylinder, the left side of the top of sealing cylinder is provided with feeding pipe. Through the device setting sand mill roller and sand mill disc, realize preliminary rough grinding, again equipped with sand mill disc and mounting ring, realize fine grinding, the two-stage grinding structure effectively enhances the depolymerization ability to slurry, significantly improves dispersion fineness and uniformity, in addition, the grading return mechanism of setting receiving tray, second servo motor and screw feed rod composition can realize the screening of slurry after grinding, and fine slurry with good flowability and particle size up to standard can pass through the blanking hole of receiving tray and be discharged directly, while coarse particles and grinding medium that do not meet the fineness requirement are reintroduced into grinding area through screw feed rod, effectively preventing qualified slurry from being repeatedly ground, while ensuring that non-compliant materials are continuously returned for further processing, improving product quality consistency.

Description

Technical Field

[0001] This utility model relates to the field of nanomaterial dispersion equipment technology, and in particular to a dispersion mill for preparing carbon nanotube powder slurry. Background Technology

[0002] Carbon nanotubes (CNTs) have broad application prospects in lithium-ion battery electrode materials, conductive composite materials, and flexible electronic devices due to their excellent electrical, mechanical, and thermal properties. However, CNTs are prone to agglomeration in powder form, forming bundles or networks with strong van der Waals forces. This makes them difficult to disperse uniformly in solvents or matrices. Insufficient dispersion will seriously affect the conductivity, mechanical strength, and batch stability of the final product. In practical applications, CNTs usually need to be prepared into a highly stable and uniform slurry form beforehand. This process mainly relies on wet grinding and dispersion technology, with sand mills as the core equipment. They are widely used in the ultrafine grinding process of nanomaterials. The basic principle is to use the collision, compression, and shearing effects between high-speed moving grinding media to break the agglomeration structure of CNT aggregates, thereby achieving uniform dispersion at the microscale.

[0003] Patent CN217473669U discloses a sand mill for dispersing carbon nanotube conductive slurry. This device comprises a support frame, a support plate, a filter cylinder, a sealing cylinder, a first sliding hole, a connecting block, and a hydraulic push rod. When the sealing cylinder is in close contact with the support plate, it seals the filter holes on the filter cylinder, causing the slurry to accumulate on the filter cylinder. When the sealing cylinder separates from the support plate, the slurry separates from the grinding media through the filter holes on the filter cylinder, and then passes through the support frame, support plate, filter cylinder, sealing cylinder, first sliding hole, connecting block, and hydraulic push rod. The push rod is designed to prevent the grinding media from entering the discharge pipe on the machine body, thus preventing the slurry from being blocked by the grinding media and causing poor discharge. However, in actual use, firstly, this device lacks a return material mechanism, and some agglomerates are not fully deagglomerated and will be discharged with the qualified slurry or remain in the chamber, resulting in uneven dispersion and poor product consistency. Secondly, the shear force distribution in the grinding area of ​​this device is singular, mainly relying on the random collision of the grinding media, which has limited ability to deagglomerate high-strength agglomerates and is difficult to meet the fine processing requirements of highly dispersible materials such as carbon nanotubes.

[0004] Therefore, there is an urgent need to provide a dispersion mill for preparing carbon nanotube powder slurry that features both return material circulation grinding and multi-stage shear grinding. Utility Model Content

[0005] In order to overcome the shortcomings of existing dispersion milling equipment in processing carbon nanotube slurry, such as the lack of effective return material circulation function and low grinding efficiency, which makes it difficult to meet the fine processing requirements of highly difficult-to-disperse materials like carbon nanotubes, this utility model provides a dispersion milling machine for preparing carbon nanotube powder slurry with return material circulation grinding and multi-stage shear grinding.

[0006] To address the aforementioned problems, this utility model adopts the following technical solution: a dispersion mill for preparing carbon nanotube powder slurry, comprising a tripod, a sealing cylinder at the top of the tripod, a feeding pipe on the left side of the top of the sealing cylinder, a first servo motor mounted at the center of the top of the sealing cylinder, the output shaft of the first servo motor rotating downwards through the top of the sealing cylinder, a discharge pipe at the bottom of the sealing cylinder, a ball valve mounted on the discharge pipe, and a milling cylinder fixedly mounted at the end of the output shaft of the first servo motor. The milling cylinder has a hollow cylindrical structure with a discharge port at its upper end. Symmetrically distributed milling discs are fixedly mounted inside the sealing cylinder. The grinding cylinder is equipped with symmetrically distributed mounting rings on its exterior. Several first grinding protrusions are evenly distributed on the inner circumference of the grinding disc, and several second grinding protrusions are evenly distributed on the outer circumference of the mounting rings. Symmetrically distributed connecting shafts are provided at both ends of the sealing cylinder, and a grinding roller is rotatably mounted on each connecting shaft. A receiving plate is fixedly provided at the bottom of the sealing cylinder, and an annular feeding gap is left between the receiving plate and the bottom of the grinding cylinder. Several dropping holes are evenly opened on the receiving plate along the circumference. A second servo motor is installed at the center of the bottom of the sealing cylinder, and a spiral feeding rod is connected to the output shaft of the second servo motor. The spiral feeding rod is located inside the grinding cylinder.

[0007] Furthermore, the direction of the second abrasive protrusion is opposite to that of the first abrasive protrusion, forming an interlaced shear structure.

[0008] Furthermore, the receiving tray has an inverted conical structure design.

[0009] Furthermore, a connecting ring is sleeved at the lower end of the spiral feed rod, and a scraper is provided on the connecting ring. The outline of the scraper is adapted to the surface of the receiving tray.

[0010] Furthermore, the second servo motor is fitted with a protective shell.

[0011] Furthermore, a support ring is provided at the bottom of the tripod.

[0012] Compared with the prior art, the present invention has the following technical effects: 1. By setting up a grinding roller and a grinding disc in this device, preliminary coarse grinding is achieved, and then fine grinding is achieved by equipping the grinding disc and the mounting ring. This dual-stage grinding structure effectively enhances the deagglomeration ability of the slurry and significantly improves the dispersion fineness and uniformity. In addition, the graded return mechanism composed of a receiving tray, a second servo motor and a spiral feed rod can realize the screening of the ground slurry. Fine slurry with qualified particle size and good flowability can be directly discharged through the discharge hole of the receiving tray, while coarse particles and grinding media that do not meet the fineness requirements are reintroduced into the grinding zone through the spiral feed rod, effectively preventing qualified slurry from being repeatedly ground, while ensuring that unqualified materials are continuously returned for reprocessing, thus improving the consistency of product quality.

[0013] 2. By installing a scraper at the lower end of the spiral feeder, the material accumulated on the surface of the receiving tray can be effectively scraped, preventing it from lingering in the edge area or forming dead zones, ensuring that all substandard materials can enter the return channel in a timely manner, and improving material utilization and dispersion uniformity. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a three-dimensional cross-sectional view of the sealing cylinder, the first servo motor, and the grinding roller of this utility model.

[0016] Figure 3 This is a three-dimensional cross-sectional view of the grinding cylinder, grinding disc, and spiral feed rod of this utility model.

[0017] Figure 4 This is a three-dimensional cross-sectional view of the sand grinding disc, mounting ring, and sand grinding roller of this utility model.

[0018] Figure 5 This is a three-dimensional cross-sectional view of the grinding cylinder, receiving tray, and second servo motor of this utility model.

[0019] The components are: 1-triangular frame, 2-sealing cylinder, 3-feeding pipe, 4-first servo motor, 5-discharge pipe, 6-ball valve, 7-grinding cylinder, 8-grinding disc, 9-mounting ring, 10-first grinding protrusion, 11-second grinding protrusion, 12-connecting shaft, 13-grinding roller, 14-receiving tray, 15-discharge hole, 16-second servo motor, 17-spiral feeding rod, 18-discharge port, 19-connecting ring, 20-scraper, 21-protective shell, 22-support ring. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments. It should also be noted that, unless otherwise explicitly specified and limited, terms such as "setting," "installing," "connecting," 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0021] Example 1: Please refer to Figures 1-5 A dispersion mill for preparing carbon nanotube powder slurry includes a tripod 1, a sealing cylinder 2 at the top of the tripod 1, a feeding pipe 3 on the top left side of the sealing cylinder 2, a first servo motor 4 installed at the center of the top of the sealing cylinder 2, the output shaft of the first servo motor 4 rotating downwards through the top of the sealing cylinder 2, a discharge pipe 5 at the bottom of the sealing cylinder 2, a ball valve 6 installed on the discharge pipe 5, and a milling cylinder 7 fixedly installed at the end of the output shaft of the first servo motor 4. The milling cylinder 7 is a hollow cylindrical structure with a discharge port at its upper end. 18. A symmetrically distributed grinding disc 8 is fixedly installed inside the sealing cylinder 2. A symmetrically distributed mounting ring 9 is installed on the outside of the grinding cylinder 7. Several first grinding protrusions 10 are evenly distributed on the inner circumference of the grinding disc 8, and several second grinding protrusions 11 are evenly distributed on the outer circumference of the mounting ring 9. The direction of the second grinding protrusions 11 is opposite to that of the first grinding protrusions 10, forming an interlaced shearing structure. When the mounting ring 9 rotates, the second grinding protrusions 11 and the first grinding protrusions 10 undergo high-frequency shearing and extrusion, achieving fine grinding of the slurry. The sealing cylinder 2... The upper and lower ends are each equipped with symmetrically distributed connecting shafts 12. Each connecting shaft 12 is rotatably mounted with a grinding roller 13. The grinding roller 13 is located above the grinding disc 8 and can contact and roll with the surface of the grinding disc 8 when the grinding cylinder 7 rotates, achieving preliminary coarse grinding. A receiving tray 14 is fixedly installed at the bottom of the sealed cylinder 2. An annular feeding gap is left between the receiving tray 14 and the bottom of the grinding cylinder 7. In addition, the receiving tray 14 has an inverted conical structure design. Its inclined conical surface can naturally guide the slurry to the central area and avoid accumulation at the edge. Several material discharge holes 15 are evenly opened along the circumference. The diameter of the holes is smaller than the particle size of the grinding media, allowing only slurry with the required fineness to pass through. A second servo motor 16 is installed at the center of the bottom inside the sealing cylinder 2. A spiral feeding rod 17 is connected to the output shaft of the second servo motor 16. The spiral feeding rod 17 is located inside the sand mill cylinder 7. A protective shell 21 is fitted around the second servo motor 16 to isolate and protect the material from the second servo motor 16 and prevent foreign objects from entering. A support ring 22 is provided at the bottom of the tripod 1 to increase the weight of the bottom of the device and improve its stability.

[0022] During operation, carbon nanotube powder, solvent, and grinding media are injected into the sealed cylinder 2 through the feeding pipe 3. The first servo motor 4 and the second servo motor 16 are then activated. The first servo motor 4 drives the grinding cylinder 7 to rotate at high speed, causing the mounting ring 9 and grinding roller 13 mounted on its outer wall to rotate synchronously. During rotation, the grinding roller 13 contacts the fixed grinding disc 8 and rotates due to friction, achieving coarse grinding of the slurry. The coarsely ground slurry flows into the gap between the grinding disc 8 and the mounting ring 9. At this time, the first grinding protrusion 10 on the grinding disc 8 and the second grinding protrusion 11 on the mounting ring 9 are in opposite directions, creating a strong shearing and collision effect, achieving fine grinding of the slurry. The resulting mixture of the ground slurry and grinding media... The material falls downwards into the receiving tray 14 at the bottom. The slurry that meets the grinding standard falls directly into the discharge pipe 5 area through the discharge hole 15 on the receiving tray 14 and is discharged under the control of the ball valve 6. The slurry and grinding media that do not meet the fineness standard cannot pass through the discharge hole 15 due to their large particle size. They slide along the surface of the receiving tray 14 towards the center area and enter the annular feed gap between the bottom of the sand mill 7 and the receiving tray 14. After this part of the material enters the sand mill 7, it is forcibly conveyed from bottom to top by the spiral feed rod 17 and finally discharged from the discharge port 18 at the top of the sand mill 7. It then re-enters the grinding area for cyclic grinding. This cycle is repeated to achieve efficient, uniform dispersion and ultrafine grinding of carbon nanotube slurry, ensuring that the final product has a uniform particle size distribution and stable dispersion.

[0023] Example 2: Based on Example 1, please refer to... Figure 5 The lower end of the spiral feed rod 17 is fitted with a connecting ring 19, and a scraper 20 is provided on the connecting ring 19. The outline of the scraper 20 is adapted to the surface of the receiving tray 14 so as to scrape the material.

[0024] When the spiral feed rod 17 rotates, the connecting ring 19 installed at its lower end rotates synchronously, driving the scraper 20 to make a circular motion around the center of the receiving tray 14. Since the contour of the scraper 20 matches the inverted conical receiving tray 14, it can effectively scrape the substandard slurry and grinding media accumulated on the surface of the receiving tray 14 during the rotation process, preventing the material from lingering in the edge area or forming dead zones, ensuring that all substandard materials can enter the return channel in time, and improving the material utilization rate and dispersion uniformity.

[0025] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dispersion mill for preparing carbon nanotube powder slurry, comprising a tripod (1), a sealing cylinder (2) at the top of the tripod (1), a feeding pipe (3) on the left side of the top of the sealing cylinder (2), a first servo motor (4) installed at the center of the top of the sealing cylinder (2), the output shaft of the first servo motor (4) rotating downward through the top of the sealing cylinder (2), a discharge pipe (5) at the bottom of the sealing cylinder (2), a ball valve (6) installed on the discharge pipe (5), a grinding cylinder (7) fixedly installed at the end of the output shaft of the first servo motor (4), the grinding cylinder (7) being a hollow cylinder structure with a discharge port (18) at its upper end, characterized in that, The sealing cylinder (2) is fixedly provided with symmetrically distributed grinding discs (8). The grinding cylinder (7) is installed with symmetrically distributed mounting rings (9) on its outside. Several first grinding protrusions (10) are evenly distributed on the inner circumference of the grinding discs (8), and several second grinding protrusions (11) are evenly distributed on the outer circumference of the mounting rings (9). Both ends of the sealing cylinder (2) are provided with symmetrically distributed connecting shafts (12). Each connecting shaft (12) is rotatably mounted with a grinding roller (13). A receiving plate (14) is fixedly installed at the bottom of the sealing cylinder (2). An annular feeding gap is left between the receiving plate (14) and the bottom of the sand grinding cylinder (7). Several dropping holes (15) are evenly opened along the circumference of the receiving plate (14). A second servo motor (16) is installed at the center of the bottom of the sealing cylinder (2). A spiral feeding rod (17) is connected to the output shaft of the second servo motor (16). The spiral feeding rod (17) is located inside the sand grinding cylinder (7).

2. The dispersion mill for preparing carbon nanotube powder slurry according to claim 1, characterized in that, The direction of the second abrasive ridge (11) is opposite to that of the first abrasive ridge (10), forming an interlaced shear structure.

3. The dispersion mill for preparing carbon nanotube powder slurry according to claim 2, characterized in that, The receiving tray (14) has an inverted cone-shaped structure design.

4. The dispersion mill for preparing carbon nanotube powder slurry according to claim 3, characterized in that, The lower end of the spiral feed rod (17) is fitted with a connecting ring (19), and a scraper (20) is provided on the connecting ring (19). The outline of the scraper (20) is adapted to the surface of the receiving tray (14).

5. A dispersion mill for preparing carbon nanotube powder slurry according to claim 4, characterized in that, The second servo motor (16) is covered with a protective shell (21).

6. The dispersion mill for preparing carbon nanotube powder slurry according to claim 5, characterized in that, The tripod (1) is provided with a support ring (22) at its bottom.

Images