Carbon nanotube composite conductive paste ball milling device

Abstract

The utility model discloses carbon nanotube composite conductive slurry ball mill device, including base and ball mill jar. Advantageous effect: when carbon nanotube conductive slurry batching is carried out ball mill, drive motor drives driving gear rotation, drives driven gear and ball mill jar rotation, drives grinding ball to turn over and throw, and carbon series auxiliary material is carried out ball mill, when ball mill is carried out, air blower produces airflow, and through gas pipe enters into feed pipe, and enters into ball mill jar, forms flowing air, and the carbon series auxiliary material powder of meeting the particle size requirement is under the entrapment of airflow and passes filter screen through feed pipe and enters into cyclone dust collector, and after processing, completes discharge collection, when ball mill jar rotates, ball mill jar drives filter screen rotation, and sweep bar is fixedly connected with end cover, and does not rotate, and brush and filter screen produce relative rotation, and brush cleans filter screen at moment, avoids filter screen blockage phenomenon, improves the smoothness of filtration, reduces cleaning frequency, improves convenient and efficient use.

Description

Technical Field

[0001] This utility model relates to the field of carbon nanotube composite conductive slurry preparation technology, and more specifically, to a ball milling device for carbon nanotube composite conductive slurry. Background Technology

[0002] Conductive paste is one of the core materials for conductive agents in lithium batteries. It is typically composed of conductive fillers and polymeric binders. The conductive fillers include carbon-based materials such as carbon nanotubes, graphene, graphite, and conductive carbon black, while the polymeric binders include polymers such as polyester, polyurethane, and epoxy resin. Among these, waterborne polyurethane has excellent safety, environmental friendliness, chemical resistance, and oil resistance, and it also exhibits high mechanical properties and good flexibility after film formation. Therefore, it is often chosen as a polymeric binder to work with graphene.

[0003] The main material of carbon nanotube composite conductive paste is carbon nanotubes, which are mainly produced by methods such as arc discharge, laser ablation, and solid-phase pyrolysis. The auxiliary materials are mainly carbon-based raw materials such as carbon black and graphite, which are ground and mixed with carbon nanotubes. Then, they are compounded with dispersants, modified polyurethane emulsions, and N-methylpyrrolidone to complete the processing of conductive paste. The carbon black raw materials are usually ground by ball mill. Traditional ball mills are equipped with filters to separate materials that meet the particle size requirements. However, the filters will become clogged after long-term use and need to be cleaned frequently, which is quite troublesome. This makes the feeding, grinding, discharging and filtering process less smooth and efficient, and further improvements can be made. Utility Model Content

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a ball milling device for carbon nanotube composite conductive slurry, which has the advantages of improved working efficiency and ease of use, thereby solving the problems mentioned in the background technology.

[0005] (II) Technical Solution To achieve the aforementioned advantages of improved work efficiency and ease of use, the specific technical solution adopted by this utility model is as follows: a carbon nanotube composite conductive slurry ball milling device, comprising a base and a ball milling cylinder. The ball milling cylinder is rotatably connected to the top surface of the base via a bracket, and grinding balls are placed inside the ball milling cylinder. An end cap is fixedly mounted on the top surface of the base. The end cap is rotatably connected to one end of the ball milling cylinder via a first sealing bearing, and a connecting rod is fixedly connected to the inner wall of the end cap. A sweeping rod is fixedly connected to the other end of the connecting rod. A perforated plate is fixedly installed inside one end of the ball milling cylinder, and a filter screen is fixedly installed on one side surface of the perforated plate. The sweeping rod passes through the perforated plate and the filter screen and is rotatably connected to the perforated plate via a second sealed bearing. A brush is fixedly installed on one side of the sweeping rod, and the brush slides against the other side of the filter screen. A feed pipe is fixedly mounted on the other end of the top surface of the base, and the feed pipe passes through the other end of the ball mill cylinder and is rotatably connected to the other end of the ball mill cylinder via a sealed bearing. A blower is connected to the other end of the feed pipe via an air supply pipe. A drive motor is fixedly installed on the top surface of the base, and a drive gear is installed at the output end of the drive motor. A driven gear is fixedly installed on the outer wall of the other end of the ball mill cylinder, and the driven gear meshes with the drive gear.

[0006] Furthermore, a conveying pipe is connected through the bottom surface of the end cap, and a cyclone dust collector is connected through the other end of the conveying pipe.

[0007] Furthermore, the two ends of the ball mill cylinder pass through the support and are rotatably connected to the support via bearings.

[0008] Furthermore, the top surface of the feed pipe is connected to a lock air unloader, and the feed end of the lock air unloader is connected to a feed hopper.

[0009] Furthermore, a screen is fixedly installed inside the ball mill cylinder, and the screen aperture is smaller than the grinding ball particle size.

[0010] Furthermore, the ball mill cylinder, feed pipe, connecting rod, end cap, and filter screen are arranged coaxially.

[0011] Furthermore, the filter mesh pore size is matched with the target particle size of the carbon-based auxiliary material.

[0012] (III) Beneficial Effects Compared with the prior art, this utility model provides a ball milling device for carbon nanotube composite conductive slurry, which has the following beneficial effects: (1) This utility model is equipped with a sweeping rod, a filter screen and a cyclone dust collector. When ball milling carbon nanotube conductive slurry, carbon-based auxiliary materials such as carbon black and graphite can be put into the ball mill. The drive motor drives the drive gear to rotate, which drives the driven gear and the ball mill to rotate, and drives the grinding balls to tumble and spar, thus ball milling the carbon-based auxiliary materials. During ball milling, the blower generates airflow, which enters the feed pipe through the air delivery pipe and enters the ball mill, forming flowing air. The carbon-based auxiliary material powder that meets the particle size requirements passes through the filter screen and enters the cyclone dust collector under the airflow. After processing, the material is discharged and collected. When the ball mill rotates, the ball mill drives the filter screen to rotate. The sweeping rod is fixedly connected to the end cover and does not rotate. The brush and the filter screen rotate relative to each other. The brush cleans the filter screen at all times, avoiding the phenomenon of filter screen blockage, improving the smoothness of filtration, reducing the number of cleaning times, and improving the convenience of use and work efficiency.

[0013] (2) This utility model is equipped with a feeding hopper and a lock air unloader. The operator can feed raw materials while performing ball milling. When feeding, the lock air unloader will lock the raw materials in the feeding hopper into the feeding pipe. The raw materials that enter the feeding pipe will enter the ball mill under the drive of the airflow, thereby realizing the operation of feeding, ball milling and discharging at the same time. The operation is highly continuous, the work efficiency is higher, and the use is more convenient. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the internal structure of a ball milling device for carbon nanotube composite conductive slurry according to an embodiment of the present invention; Figure 2 This is a front view of a ball milling apparatus for carbon nanotube composite conductive slurry according to an embodiment of the present invention; Figure 3 This is an enlarged view of node A of the ball milling device for carbon nanotube composite conductive slurry according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the installation of the sweeper arm according to an embodiment of the present utility model.

[0016] In the picture: 1. Grinding mill cylinder; 2. Filter screen; 3. Grinding balls; 4. Support; 5. Barrier; 6. End cap; 7. First sealed bearing; 8. Connecting rod; 9. Orifice plate; 10. Sweeping bar; 11. Feed pipe; 12. Cyclone dust collector; 13. Drive motor; 14. Drive gear; 15. Driven gear; 16. Base; 17. Feed pipe; 18. Feed hopper; 19. Airlock unloader; 20. Blower; 21. Air supply pipe; 22. Brush; 23. Second sealed bearing. Detailed Implementation

[0017] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0018] According to an embodiment of the present invention, a ball milling device for carbon nanotube composite conductive slurry is provided.

[0019] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. Please refer to them. Figure 1 and Figure 4 The carbon nanotube composite conductive slurry ball milling device according to an embodiment of the present invention includes a base 16 and a ball milling cylinder 1. The ball milling cylinder 1 is rotatably connected to the top surface of the base 16 via a bracket 4. Both ends of the ball milling cylinder 1 pass through the bracket 4 and are rotatably connected to the bracket 4 via bearings. The bracket 4 provides support and is arranged in two sets. The ball milling cylinder 1 contains grinding balls 3, which are arranged in various types and diameters to adapt to different grinding stages. This is a common structure and will not be described in detail here. An end cap 6 is fixedly mounted on the top surface of the base 16. The end cap 6 is rotatably connected to one end of the ball milling cylinder 1 via a first sealing bearing 7. The bearing adopts a high-precision sealing structure to prevent air leakage and powder leakage. A connecting rod 8 is fixedly connected to the inner wall of the end cap 6. Furthermore, a sweeping rod 10 is fixedly connected to the other end of the connecting rod 8. A perforated plate 9 is fixedly installed inside one end of the ball mill cylinder 1. The perforated plate 9 is made of high-strength metal plate, and a filter screen 2 is fixedly installed on one side surface of the perforated plate 9. The perforated plate 9 is used to fix the filter screen 2 and enhance the stability of the filter screen 2 under high-speed airflow and powder impact. The surface of the perforated plate 9 is densely perforated with evenly distributed holes to facilitate the passage of powder. The sweeping rod 10 passes through the perforated plate 9 and the filter screen 2 and is rotatably connected to the perforated plate 9 through the second sealing bearing 23. It has excellent sealing performance and avoids unfiltered powder leakage. A brush 22 is fixedly installed on one side surface of the sweeping rod 10. The brush 22 is made of wear-resistant material, and the brush 22 slides against the other side surface of the filter screen 2 to ensure cleaning effect without damaging the filter screen 2.

[0020] A feed pipe 17 is fixedly mounted on the other end of the top surface of the base 16. The feed pipe 17 passes through the other end of the ball mill cylinder 1 and is rotatably connected to the other end of the ball mill cylinder 1 through a sealed bearing. The multiple sealing design avoids air leakage and improves the overall sealing performance. The other end of the feed pipe 17 is connected to a blower 20 through an air supply pipe 21. The blower 20 can provide a stable airflow. A drive motor 13 is fixedly mounted on the top surface of the base 16, and a drive gear 14 is mounted on the output end of the drive motor 13. A driven gear 15 is fixedly mounted on the outer wall of the other end of the ball mill cylinder 1, and the driven gear 15 meshes with the drive gear 14. The transmission ratio has been optimized and is a common drive structure to ensure that the ball mill cylinder 1 obtains a suitable rotation speed.

[0021] When ball milling the carbon nanotube conductive paste, carbon-based auxiliary materials such as carbon black and graphite can be added into the ball mill cylinder 1. The drive motor 13 drives the drive gear 14 to rotate, which in turn drives the driven gear 15 and the ball mill cylinder 1 to rotate, causing the grinding balls 3 to tumble, collide, and grind, thus refining the carbon-based auxiliary materials. During ball milling, the blower 20 generates airflow, which enters the feed pipe 17 through the air delivery pipe 21 and then into the ball mill cylinder 1, forming a directional airflow field. The carbon-based auxiliary material powder that meets the particle size requirements is carried by the airflow through... The filter screen 2 enters the cyclone dust collector 12 through the feed pipe 11. After separation, the filter screen 2 is collected and discharged. When the ball mill cylinder 1 rotates, the ball mill cylinder 1 drives the filter screen 2 to rotate synchronously. The sweeping rod 10 is fixedly connected to the end cover 6 and remains stationary, so that the brush 22 and the filter screen 2 rotate relative to each other. The brush 22 cleans the surface of the filter screen 2 at all times, which effectively avoids the clogging of the filter screen 2 caused by powder adhesion, improves the smoothness of filtration, greatly reduces the number of downtime cleanings, and improves the convenience of use and work efficiency.

[0022] Please refer to Figure 1 and Figure 2 The bottom surface of the end cap 6 is connected to a conveying pipe 11. The conveying pipe 11 is made of corrosion-resistant material, and the other end of the conveying pipe 11 is connected to a cyclone dust collector 12. The cyclone dust collector 12 has high separation efficiency and can effectively capture fine powder. It also has a built-in airlock unloading mechanism, which can realize continuous discharge and collection, and facilitate the subsequent processing of carbon-based auxiliary materials.

[0023] Please refer to Figure 1 and Figure 2The top surface of the feed pipe 17 is connected to an airlock unloader 19, which has good airtightness. The feed end of the airlock unloader 19 is connected to a feed hopper 18, allowing the operator to feed raw materials while performing ball milling. During feeding, the airlock unloader 19 feeds the raw materials in the feed hopper 18 into the feed pipe 17 at a stable rate, preventing airflow from overflowing from the feed inlet and affecting the internal air pressure balance. The raw materials entering the feed pipe 17 are evenly fed into the ball mill cylinder 1 by the airflow, thus realizing continuous operation of feeding, ball milling, discharging and filtering. The operation is highly continuous, greatly increasing the throughput per unit time, improving work efficiency and making it more convenient to use.

[0024] Please refer to Figure 1 and Figure 2 Inside the ball mill cylinder 1, a baffle 5 is fixedly installed. The baffle 5 adopts a high-strength metal mesh structure, and the aperture of the baffle 5 is smaller than the minimum particle size of the grinding ball 3. The baffle 5 can effectively prevent the grinding ball 3 from moving towards the feed end and the discharge end, avoid the grinding ball 3 from hitting the filter screen 2, the sweeping rod 10 and the feed pipe 17 and other components, protect the filter screen 2 and the sweeping rod 10, and extend their service life.

[0025] Please refer to Figure 1 and Figure 3 The ball mill cylinder 1, feed pipe 17, connecting rod 8, end cover 6 and filter screen 2 are arranged coaxially to ensure the stability of the equipment when it is running at high speed, reduce vibration and noise caused by eccentricity, reduce the loss during operation of the equipment, and at the same time ensure the stability of the airflow and powder flow path in the cylinder, thereby improving the ball milling and filtration efficiency.

[0026] Please refer to Figure 1 and Figure 3 The pore size of filter screen 2 is matched with the target particle size of carbon-based auxiliary materials. The filter screen 2 of the appropriate specification can be replaced according to different process requirements. Filter screen 2 is made of stainless steel mesh, which has excellent wear resistance and corrosion resistance, and extends service life. Filter screen 2, sweeping rod 10, connecting rod 8 and end cap 6 are all made of metal. Each component has good conductivity. End cap 6 is grounded by grounding wire, which can effectively discharge the static electricity generated during equipment operation, reduce the phenomenon of filter screen 2 adsorbing powder due to static electricity, and improve filtration stability.

[0027] Working principle: When ball milling the carbon nanotube conductive slurry, carbon-based auxiliary materials such as carbon black and graphite are put into the ball milling cylinder 1. The drive motor 13 is started, and the drive motor 13 drives the drive gear 14 to rotate. Through gear meshing, the driven gear 15 and the ball milling cylinder 1 are driven to rotate. The grinding balls 3 in the ball milling cylinder 1 are tumbled and collided under the action of centrifugal force and gravity, and the carbon-based auxiliary materials are fully ball-milled and refined.

[0028] During the ball milling process, the blower 20 is started simultaneously. The airflow generated by the blower 20 enters the feed pipe 17 through the air delivery pipe 21, and then enters the ball mill cylinder 1, forming a stable airflow field from the feed end to the discharge end. The carbon-based auxiliary powder that meets the particle size requirements moves towards the filter screen 2 under the airflow. After passing through the filter screen 2, it enters the cyclone dust collector 12 through the feed pipe 11. After cyclone separation, the material is discharged and collected.

[0029] When the ball mill cylinder 1 rotates, it drives the filter screen 2 to rotate together. Since the sweeping rod 10 is fixedly connected to the end cover 6 and remains stationary, the brush 22 and the surface of the filter screen 2 will continuously rotate relative to each other. The brush 22 continuously cleans the powder adhering to the surface of the filter screen 2, avoids the filter screen 2 from being blocked, and ensures the smooth passage of airflow and qualified powder.

[0030] Meanwhile, workers can feed raw materials into the airlock unloader 19 through the feed hopper 18. The airlock unloader 19 continuously and evenly feeds the raw materials into the feed pipe 17. The raw materials enter the ball mill cylinder 1 to participate in ball milling under the drive of the airflow, realizing continuous operation of feeding, ball milling and discharging and filtering at the same time. The whole process does not require stopping the machine, has high work continuity, greatly improves work efficiency, and is more convenient to use.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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 ball milling device for carbon nanotube composite conductive slurry, comprising a base (16) and a ball milling cylinder (1), characterized in that, The top surface of the base (16) is rotatably connected to a ball mill cylinder (1) via a bracket (4), and the ball mill cylinder (1) contains grinding balls (3). An end cap (6) is fixedly mounted on the top surface of the base (16). The end cap (6) is rotatably connected to one end of the ball mill cylinder (1) via a first sealing bearing (7). A connecting rod (8) is fixedly connected to the inner wall of the end cap (6), and a sweeping rod (10) is fixedly connected to the other end of the connecting rod (8). A perforated plate (9) is fixedly installed inside one end of the ball mill cylinder (1), and a filter screen (2) is fixedly installed on one side surface of the perforated plate (9). The sweeping rod (10) passes through the perforated plate (9) and the filter screen (2) and is rotatably connected to the perforated plate (9) via a second sealing bearing (23). A brush (22) is fixedly installed on one side of the surface of the base (16), and the brush (22) slides against the other side of the filter screen (2). A feed pipe (17) is fixedly mounted on the other end of the top surface of the base (16), and the feed pipe (17) passes through the other end of the ball mill cylinder (1) and is rotatably connected to the other end of the ball mill cylinder (1) through a sealed bearing. A blower (20) is connected through the air supply pipe (21) on the other end of the feed pipe (17). A drive motor (13) is fixedly installed on the top surface of the base (16), and a drive gear (14) is installed at the output end of the drive motor (13). A driven gear (15) is fixedly installed on the outer wall of the other end of the ball mill cylinder (1), and the driven gear (15) meshes with the drive gear (14).

2. The ball milling device for carbon nanotube composite conductive slurry according to claim 1, characterized in that, The bottom surface of the end cap (6) is connected to a conveying pipe (11), and the other end of the conveying pipe (11) is connected to a cyclone dust collector (12).

3. The ball milling apparatus for carbon nanotube composite conductive slurry according to claim 1, characterized in that, The ball mill cylinder (1) passes through the support (4) at both ends and is rotatably connected to the support (4) through bearings.

4. The ball milling apparatus for carbon nanotube composite conductive slurry according to claim 1, characterized in that, The top surface of the feed pipe (17) is connected to the airlock unloader (19), and the feed end of the airlock unloader (19) is connected to the feed hopper (18).

5. The ball milling apparatus for carbon nanotube composite conductive slurry according to claim 1, characterized in that, The ball mill cylinder (1) is fixedly installed with a screen (5), and the aperture of the screen (5) is smaller than the particle size of the grinding ball (3).

6. The ball milling apparatus for carbon nanotube composite conductive slurry according to claim 1, characterized in that, The ball mill cylinder (1), feed pipe (17), connecting rod (8), end cap (6) and filter screen (2) are arranged coaxially.

7. The ball milling apparatus for carbon nanotube composite conductive slurry according to claim 1, characterized in that, The pore size of the filter screen (2) is matched with the target particle size of the carbon-based auxiliary material.

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