Crushing device for negative electrode material of graphite lithium battery

Abstract

The invention relates to the technical field of smashing devices, in particular to a smashing device for a graphite lithium battery negative electrode material, which comprises a shell, the interior of the shell is divided into a smashing cavity and a storage cavity, and a storage part with a hollow structure is arranged in the storage cavity; the crushing and conveying mechanism is used for conveying external graphite particles to the crushing cavity and carrying out coarse crushing on the graphite particles in the conveying process; the crushing mechanism is used for crushing the graphite particles; the driving mechanism is used for transmitting power to the crushing mechanism, and meanwhile, the air and the graphite particles in the crushing cavity are conveyed into the storage part in the power transmitting process; and the screening plate is installed in the storage part, an outlet is formed in the storage part, and the storage part communicates with the crushing cavity through a circulating pipe. Graphite particles are conveyed into the crushing cavity through the crushing and conveying mechanism, then the driving mechanism is used for driving the crushing mechanism to crush the graphite particles, and finally the graphite particles are screened through the screening plate, so that the crushing efficiency of the graphite particles and the uniformity of the crushing granularity are improved.

Description

Technical Field

[0001] The invention relates to the technical field of pulverizing devices, in particular to a pulverizing device for graphite lithium battery negative electrode materials. Background Art

[0002] Graphite lithium battery negative electrode material refers to the graphite material used as the negative electrode (anode) in lithium-ion batteries. It has good cycle stability, high theoretical capacity and low cost, and has been widely used in various lithium-ion batteries.

[0003] In the traditional lithium-ion battery production process, graphite negative electrode materials usually exist in the form of particles or powders. At present, the devices for crushing them generally include ball mills and air flow mills. Although the above-mentioned crushing devices can crush graphite negative electrode materials, there are still many shortcomings in practical applications. First, the ball mill has a low crushing efficiency when processing high-hardness graphite particles, and it is easy to cause the rupture of graphite sheets, thereby affecting the conductivity and cycle life of the material; secondly, the air flow mill has limited effect when processing high-viscosity or easily agglomerated graphite materials, and it is difficult to achieve ideal particle size control and uniformity. Therefore, the present invention aims to provide a crushing device that can improve the crushing efficiency of harder graphite particles and control the uniformity of the particle size of graphite particles. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides a pulverizing device for graphite lithium battery negative electrode materials, which can improve the pulverizing efficiency of harder graphite particles and control the uniformity of the particle size of the graphite particles, so as to solve the problems of limited pulverizing efficiency of harder graphite particles and limited effect of controlling the uniformity of the particle size of graphite particles in the prior art.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose, the present invention provides a pulverizing device for graphite lithium battery negative electrode materials, comprising a shell, the interior of which is divided into a pulverizing chamber and a storage chamber, the storage chamber is located below the pulverizing chamber, and a storage portion with a hollow structure is provided in the storage chamber; a pulverizing and conveying mechanism, which is used to convey external graphite particles to the pulverizing chamber and coarsely pulverize the graphite particles during the conveying process; a pulverizing mechanism, which is arranged in the pulverizing chamber and is used to pulverize the graphite particles; a driving mechanism, which is used to transmit power to the pulverizing mechanism, and at the same time, in the process of transmitting power, the air in the pulverizing chamber and the graphite particles are conveyed to the storage portion; and a sieve plate, which is installed in the storage portion, and an outlet is opened on the storage portion, and the outlet is arranged below the sieve plate, and the storage portion is connected with the pulverizing chamber through a circulation pipe.

[0008] Optionally, the crushing and conveying mechanism includes a feeding part, a crushing roller, a crushing protrusion and a motor; the feeding part is fixed at the top of the shell and is connected to the crushing chamber, and a feeding port is opened at the top of the feeding part; the crushing roller is rotatably arranged in the feeding part, and a plurality of crushing protrusions are arranged at intervals along the circumference of the crushing roller, and the crushing roller is driven to rotate by the motor.

[0009] Optionally, a cover plate is rotatably provided on the top of the feed portion, and the cover plate is elastically abutted by a torsion spring so that the cover plate elastically covers the feed port.

[0010] Optionally, the crushing mechanism includes a connecting cylinder, a crushing shaft, a crushing cylinder, a crushing bracket, a crushing blade 1 and a crushing blade 2; the first end of the crushing shaft passes through the top wall of the crushing chamber and is rotatably connected to the shell; the crushing bracket is composed of at least four C-shaped plates, the tops of the four plates are fixed on the crushing shaft, and the crushing blade 1 is arranged at intervals along the height direction of the inner wall of the plate; the crushing blade 2 is arranged at intervals along the circumference of the crushing cylinder, the crushing cylinder is arranged in the four plates, a rotating ring is fixed to the bottom of the crushing cylinder, and a rotating groove suitable for the rotation of the rotating ring is provided at the bottom of the four plates, the crushing blade 1 and the crushing blade 2 are staggered in the height direction, and a plurality of screening openings are spaced apart on the crushing cylinder; the connecting cylinder is fixed to the shell, the top of the connecting cylinder is connected to the bottom of the crushing cylinder, the bottom of the connecting cylinder is connected to the storage part, the second end of the crushing shaft passes through the connecting cylinder, and movably extends to stop in the storage part.

[0011] Optionally, the driving mechanism includes a second motor, a conveyor belt and an impeller; the second motor is installed on the top of the shell, and the conveyor belt is arranged between the second end of the crushing shaft and the output end of the second motor; the impeller is fixed to the second end of the crushing shaft and is movably arranged in the storage part.

[0012] Optionally, a friction-enhancing sleeve is fixed on the pulverizing shaft, and the conveyor belt sleeve is arranged between the friction-enhancing sleeve and the output end of the second motor.

[0013] Optionally, a bearing is fixed on the shell, and the inner ring of the bearing is coaxially fixed with the outer ring of the grinding shaft.

[0014] Optionally, the crushing shaft has a hollow structure, and an arc-shaped tube body is provided on the top of the crushing shaft, and the tube body connects the inside of the crushing shaft with the outside thereof. An air outlet is provided at the bottom of the crushing shaft, and the air outlet is connected to the inside of the storage portion.

[0015] Optionally, the sieve plate is installed in the storage portion in an inclined manner.

[0016] Optionally, a moving block is fixed at the end of the screen plate, a moving groove is opened in the screen plate, the moving block is slidably arranged in the moving groove, a guide rod is fixed in the moving groove, the guide rod movably passes through the moving block, and the moving block is elastically abutted by a spring.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a graphite lithium battery negative electrode material pulverizing device, which has the following beneficial effects:

[0019] 1. The present invention uses a crushing and conveying mechanism to transport graphite particles into a crushing chamber, and then uses a driving mechanism to drive the crushing mechanism to crush the graphite particles. At the same time, the driving mechanism will transport the air in the crushing chamber and the crushed graphite particles to the storage part during the power transmission process, and screen them through the screening plate. The graphite particles that meet the particle size requirements are discharged through the outlet of the storage part, and the larger graphite particles that do not meet the particle size requirements are transported back to the crushing chamber by the circulation pipe for repeated crushing. This cycle is repeated until all graphite particles are crushed to the required particle size, and finally stored in the storage chamber through the storage part. The entire device has high crushing efficiency and uniform crushing particle size.

[0020] 2. The present invention installs the screen plate in the storage part with an inclined surface. Through the inclined installation mode, the screen plate can guide the larger graphite particles to the bottom thereof by the action of gravity and airflow, so that the graphite particles can fall into the circulation pipe easily;

[0021] 3. The present invention provides a moving block. When the screen plate is impacted by graphite particles or equipment vibration, the moving block can slide in the moving groove along the direction of the guide rod and rebound under the elastic action of the spring, thereby realizing the buffering function of the screen plate and increasing the service life of the screen plate. At the same time, the vibration of the screen plate can also shake off the graphite particles attached to the screen plate, avoiding blockage of the screen holes and improving the screening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the three-dimensional structure of the present invention is shown;

[0023] Figure 2 A schematic diagram of a three-dimensional cutaway structure of the present invention is shown;

[0024] Figure 3 The schematic diagram of the main cutaway structure of the present invention is shown;

[0025] Figure 4 A partial three-dimensional structural schematic diagram of the present invention is shown;

[0026] Figure 5 Shows Figure 4 Schematic diagram of the three-dimensional cross-section structure;

[0027] Figure 6 Shows Figure 5 A schematic diagram of the enlarged structure at point A;

[0028] Figure 7 A schematic diagram of the three-dimensional structure of a pulverizing cylinder is shown;

[0029] Figure 8 A schematic diagram of a three-dimensional cross-section structure of a pulverizing cylinder and a coaxial reversing component is shown;

[0030] Fig. 9 Shows Figure 8 A schematic diagram of the enlarged structure at B;

[0031] Fig.10 A schematic diagram of the three-dimensional structure of the crushing bracket is shown.

[0032] In the figure: 1, shell; 2, crushing chamber; 3, storage chamber; 4, storage part; 5, crushing conveying mechanism; 6, crushing mechanism; 7, driving mechanism; 8, screening plate; 9, outlet; 10, circulation pipe; 11, feeding part; 12, crushing roller; 13, crushing protrusion; 14, motor 1; 15, feeding port; 16, cover plate; 17, torsion spring; 18, connecting tube; 19, crushing shaft; 20, crushing tube; 21, crushing bracket; 22, plate body ; 23. Crushing blade one; 24. Crushing blade two; 25. Rotating ring; 26. Rotating groove; 27. Screening port; 28. Coaxial reversing member; 29. ​​Gear ring; 30. Rotating shaft; 31. Gear; 32. Meshing teeth; 33. Motor two; 34. Conveyor belt; 35. Impeller; 36. Friction-increasing sleeve; 37. Bearing; 38. Tube body; 39. Air outlet; 40. Moving block; 41. Moving groove; 42. Guide rod; 43. Spring. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example: See Figures 1 to 10According to an embodiment of the present invention, a technical solution is provided: a pulverizing device for graphite lithium battery negative electrode materials, comprising a shell 1, the interior of which is divided into a pulverizing chamber 2 and a storage chamber 3, the storage chamber 3 is located below the pulverizing chamber 2, and a storage portion 4 with a hollow structure is provided in the storage chamber 3; a pulverizing and conveying mechanism 5, used to convey external graphite particles to the pulverizing chamber 2, and coarsely pulverize the graphite particles during the conveying process; a pulverizing mechanism 6, which is arranged in the pulverizing chamber 2 and is used to pulverize the graphite particles; a driving mechanism 7, which is used to transmit power to the pulverizing mechanism 6, and at the same time, in the process of transmitting power, the air and graphite particles in the pulverizing chamber 2 are transported to the storage portion 4; and a screening plate 8, which is installed in the storage portion 4, and an outlet 9 is opened on the storage portion 4, and the outlet 9 is arranged below the screening plate 8, and the storage portion 4 is connected with the pulverizing chamber 2 through a circulation pipe 10.

[0035] The graphite lithium battery negative electrode material crushing device adopts the above structure. When the user needs to crush the graphite particles, first, the graphite particles are transported to the crushing chamber 2 through the crushing conveying mechanism 5. During this conveying process, the graphite particles will be roughly crushed and then enter the crushing chamber 2. Next, the driving mechanism 7 drives the crushing mechanism 6 to crush the graphite particles. At the same time, the driving mechanism 7 will transport the air in the crushing chamber 2 and the crushed graphite particles to the storage part 4 during the power transmission process. In the storage part 4, the graphite particles are screened by the screening plate 8, and the graphite particles that meet the particle size requirements are discharged through the outlet 9 of the storage part 4, while the larger graphite particles that do not meet the particle size requirements are transported back to the crushing chamber 2 by the circulation pipe 10 for repeated crushing. This cycle is repeated until all graphite particles are crushed to the required particle size, and finally stored in the storage chamber 3 through the storage part 4. The whole device has high crushing efficiency and uniform crushing particle size.

[0036] In this embodiment, the crushing and conveying mechanism 5 includes a feed part 11, a crushing roller 12, a crushing protrusion 13 and a motor 14; the feed part 11 is fixed to the top of the shell 1 and communicated with the crushing chamber 2, and a feed port 15 is opened on the top of the feed part 11; the crushing roller 12 is rotatably arranged in the feed part 11, and a plurality of crushing protrusions 13 are arranged at intervals along the circumference of the crushing roller 12, and the crushing roller 12 is driven to rotate by the motor 14; when the user needs to crush and convey the graphite particles, first, the graphite particles are passed through The feed port 15 is added to the feed part 11. When the graphite particles enter the feed part 11, the crushing roller 12 is driven to rotate by the motor 14. As the crushing roller 12 rotates, the crushing protrusions 13 distributed around the crushing roller 12 come into contact with the graphite particles. The graphite particles are brought into contact with the inner wall of the feed part 11 by utilizing the crushing protrusions 13 to perform preliminary crushing on the graphite particles. Subsequently, the graphite particles processed by the crushing protrusions 13 are transported to the crushing chamber 2 under the action of gravity and the rotation of the crushing roller 12.

[0037] In this embodiment, a cover plate 16 is rotatably provided at the top of the feed part 11, and the cover plate 16 is elastically abutted by a torsion spring 17, so that the cover plate 16 elastically shields the feed port 15; when the user needs to add graphite particles to the feed port 15, the cover plate 16 is manually rotated to remove it from the feed port 15 to prevent foreign impurities or dust from entering the feed part 11, thereby ensuring the cleanliness of the crushing process. At the same time, when the device is not in use, the cover plate 16 can also protect the feed port 15, preventing accidental objects from falling into the interior, further improving the safety of the device.

[0038] It can be understood that since the cover 16 is connected to the torsion spring 17, the elasticity of the torsion spring 17 provides a return force to close the feed port 15. After the user releases the cover 16, the torsion spring 17 will automatically drive the cover 16 to return to its original position, thereby elastically covering the feed port 15.

[0039] In this embodiment, the crushing mechanism 6 includes a connecting tube 18, a crushing shaft 19, a crushing tube 20, a crushing bracket 21, a crushing blade 1 23 and a crushing blade 2 24; the first end of the crushing shaft 19 passes through the top wall of the crushing chamber 2 and is rotatably connected to the shell 1; the crushing bracket 21 is composed of at least four C-shaped plates 22, the tops of the four plates 22 are fixed on the crushing shaft 19, and a plurality of crushing blades 1 23 are arranged at intervals along the height direction of the inner wall of the plate 22; a plurality of crushing blades 24 are arranged at intervals along the circumference of the crushing tube 20, the crushing tube 20 is arranged in the four plates 22, a rotating ring 25 is fixed at the bottom of the crushing tube 20, and a groove suitable for the rotating ring 25 to rotate is provided at the bottom of the four plates 22. The rotating groove 26, the crushing blade 1 23 and the crushing blade 2 24 are staggered in the height direction, and a plurality of screening openings 27 are spaced apart on the crushing cylinder 20; the connecting cylinder 18 is fixed on the shell 1, the top of the connecting cylinder 18 is connected with the bottom of the crushing cylinder 20, and the bottom of the connecting cylinder 18 is connected with the storage portion 4, and the second end of the crushing shaft 19 passes through the connecting cylinder 18 and extends movably to the storage portion 4; when the user needs to crush the graphite particles, first, the crushing shaft 19 is driven to rotate by the driving mechanism 7, and the crushing bracket 21 fixed on the crushing shaft 19 and the crushing blade 1 23 are driven to rotate synchronously, so as to cut and crush the graphite particles entering the crushing chamber 2. At the same time, since the crushing blade 1 23 and the crushing blade 2 24 are staggered in the height direction, the graphite particles will be subjected to alternating crushing effects in the up and down directions during the crushing process, thereby significantly improving the crushing effect and making the graphite particles crushed more evenly. After the graphite particles in the crushing cylinder 20 are crushed, they are screened through the screening openings 27 spaced apart on the wall of the crushing cylinder 20. The graphite particles with smaller particle sizes can enter the connecting cylinder 18 through the screening openings 27, while the graphite particles with larger particle sizes continue to be repeatedly crushed by the crushing blade 1 23 and the crushing blade 2 24 in the crushing chamber 2 until their size reaches the through-hole requirement of the screening openings 27.

[0040] In this embodiment, a coaxial reversal component 28 is also included. The coaxial reversal component 28 is arranged between the crushing shaft 19 and the crushing barrel 20, and is used to drive the crushing barrel 20 to rotate in the opposite direction when the crushing shaft 19 rotates; when the crushing shaft 19 rotates, the coaxial reversal component 28 drives the crushing barrel 20 to rotate in the opposite direction, thereby realizing the relative rotation between the crushing bracket 21 and the crushing barrel 20, so that a stronger shear force and friction force are generated between the crushing blade 1 23 and the crushing blade 2 24, thereby significantly improving the crushing efficiency of the graphite particles.

[0041] In this embodiment, the coaxial reversing component 28 includes a gear ring 29, a rotating shaft 30, a gear 31 and meshing teeth 32; the gear ring 29 is fixed on the crushing shaft 19, the rotating shaft 30 is rotatably arranged at the top of the connecting tube 18, the gear 31 is fixed on the rotating shaft 30, and the gear ring 29 is meshed with the gear 31; a plurality of meshing teeth 32 are arranged at intervals along the inner circumferential side wall of the crushing tube 20, and the meshing teeth 32 are meshed with the gear 31; when the crushing shaft 19 rotates, the gear ring 29 fixed thereon also rotates synchronously therewith. In this process, the gear ring 29 drives the rotating shaft 30 to rotate by meshing with the gear 31, and the rotation direction of the rotating shaft 30 is opposite to that of the gear ring 29. Since the rotating shaft 30 is meshed with the meshing teeth 32, the crushing tube 20 is driven to rotate in the opposite direction to the crushing shaft 19.

[0042] In this embodiment, the driving mechanism 7 includes a motor 2 33, a conveyor belt 34 and an impeller 35; the motor 2 33 is installed on the top of the housing 1, and the conveyor belt 34 is sleeved between the second end of the crushing shaft 19 and the output end of the motor 2 33; the impeller 35 is fixed to the second end of the crushing shaft 19 and is movably arranged in the storage portion 4; when the user needs to drive the crushing shaft 19 to rotate, the motor 2 33 is started, so that its output end drives the second end of the crushing shaft 19 to rotate through the conveyor belt 34, thereby driving the crushing shaft 19 to rotate synchronously, and at the same time, the rotation of the crushing shaft 19 will also drive the impeller 35 to rotate. The rotation of the impeller 35 generates a strong airflow in the storage portion 4, and the airflow passes through the connecting tube 18 between the storage portion 4 and the crushing tube 20, and can generate a negative pressure effect in the crushing tube 20. The formation of negative pressure causes the graphite particles in the crushing chamber 2 to be attracted to the crushing tube 20 under the action of the airflow, and the graphite particles will be alternately sheared by the crushing blade 1 23 and the crushing blade 2 24 during the process of being sucked in, thereby further completing the crushing process.

[0043] It can be understood that due to the airflow continuously generated by the impeller 35 and the negative pressure in the pulverizing drum 20, the graphite particles can be uniformly transported to the pulverizing drum 20 for processing, and the pulverizing process is automated without the need for additional conveying devices.

[0044] Specifically, when the impeller 35 rotates at a high speed driven by the pulverizing shaft 19, it can quickly discharge the surrounding air to the storage section 4 or the outlet 9 area. This process will form a low-pressure area in the rotation center area of ​​the impeller 35, and the air around the impeller 35 will be thrown to the periphery due to centrifugal force, thereby forming a high-speed outward airflow. Since the storage section 4 is connected to the pulverizing tube 20 through the connecting tube 18, the high-speed rotation of the impeller 35 causes the air in the storage section 4 to be continuously discharged outward, which will cause the air pressure in the connecting tube 18 to drop, thereby forming a negative pressure area relative to the pulverizing chamber 2 in the pulverizing tube 20. According to the principles of fluid mechanics, the gas will flow from the high-pressure area to the low-pressure area. In the pulverizing chamber 2, due to the high air pressure, the graphite particles will be guided by the airflow and quickly move to the low-pressure pulverizing tube 20. This pressure difference drives the continuous transportation of graphite particles, forming an efficient automated transportation process.

[0045] It should be noted that with the continuous high-speed rotation of the impeller 35 and the continuous discharge of air in the storage section 4, the air pressure in the storage chamber 3 may gradually increase due to the accumulation of airflow. At this time, the circulation pipe 10 will form an airflow circulation channel. When the air pressure in the storage chamber 3 reaches a certain level, the circulation pipe 10 can guide the excess air back to the crushing chamber 2. While maintaining the pressure in the storage chamber 3 stable, it will also guide the graphite particles that have not passed through the screening plate 8 back to the crushing chamber 2 for crushing operation.

[0046] In this embodiment, a friction-enhancing sleeve 36 is fixed on the crushing shaft 19, and the conveyor belt 34 is sleeved between the friction-enhancing sleeve 36 and the output end of the motor 2 33; the friction-enhancing sleeve 36 increases the contact friction between the conveyor belt 34 and the crushing shaft 19, thereby effectively preventing the conveyor belt 34 from slipping when running at high speed.

[0047] In this embodiment, a bearing 37 is fixed on the shell 1, and the inner ring of the bearing 37 is coaxially fixed with the outer ring of the crushing shaft 19; when the crushing shaft 19 rotates at high speed, the bearing 37 can greatly reduce the friction between the crushing shaft 19 and the shell 1, making the rotation of the crushing shaft 19 smoother, while avoiding vibration or noise problems caused by axial deviation.

[0048] In this embodiment, the crushing shaft 19 has a hollow structure, and an arc-shaped tube body 38 is provided on the top of the crushing shaft 19. The tube body 38 connects the interior of the crushing shaft 19 with its exterior. An air outlet 39 is provided at the bottom of the crushing shaft 19, and the air outlet 39 is connected to the interior of the storage portion 4. When the crushing shaft 19 rotates, the tube body 38 will also rotate synchronously. At this time, the tube body 38 will inhale gas from the external air into the tube body 38, and descend along the hollow structure of the crushing shaft 19, and finally guide the airflow into the storage portion 4 through the air outlet 39 at the bottom, providing cooling airflow for the storage portion 4 to prevent the impeller 35 from overheating due to long-term operation.

[0049] In this embodiment, the screening plate 8 is installed in the storage portion 4 at an angle. Through the inclined installation method, the screening plate 8 can use gravity and airflow to guide larger graphite particles to its bottom, while allowing fine graphite particles that meet the particle size requirements to pass through the sieve holes and fall directly into the bottom of the storage portion 4, and fall into the storage chamber 3 through the outlet 9.

[0050] It can be understood that the bottom of the sieve plate 8 is aligned with the circulation pipe 10, and the inclined structure allows the substandard graphite particles to naturally slide to the bottom, thereby achieving barrier-free recovery and circulation of the graphite particles.

[0051] In this embodiment, a moving block 40 is fixed at the end of the screening plate 8, a moving groove 41 is provided in the screening plate 8, the moving block 40 is slidably arranged in the moving groove 41, a guide rod 42 is fixed in the moving groove 41, the guide rod 42 movably penetrates the moving block 40, and the moving block 40 is elastically abutted by a spring 43; when the screening plate 8 is impacted by graphite particles or equipment vibration, the moving block 40 can slide in the moving groove 41 along the direction of the guide rod 42, and rebound under the elastic action of the spring 43, thereby realizing the buffering function of the screening plate 8 and increasing the service life of the screening plate 8. At the same time, the graphite particles attached to the screening plate 8 can also be shaken off by the vibration of the screening plate 8, avoiding blockage of the screen holes and improving the screening efficiency.

[0052] Working principle: When the user needs to crush the graphite particles, first, add the graphite particles into the feed part 11 through the feed port 15. After the graphite particles enter the feed part 11, the motor 14 drives the crushing roller 12 to rotate. As the crushing roller 12 rotates, the crushing protrusions 13 distributed around the crushing roller 12 contact the graphite particles. By using the crushing protrusions 13, the graphite particles are contacted with the inner wall of the feed part 11 to perform preliminary crushing on the graphite particles. Subsequently, the graphite particles processed by the crushing protrusions 13 are transported to the crushing chamber 2 under the action of gravity and the rotation of the crushing roller 12. Next, by starting the motor 2 33, its output end drives the second end of the crushing shaft 19 to rotate through the conveyor belt 34, thereby driving the crushing shaft 19 to rotate synchronously, so as to drive the crushing bracket 21 and the crushing blade 1 23 fixed on the crushing shaft 19 to rotate synchronously, thereby cutting and crushing the graphite particles entering the crushing chamber 2. At the same time, the rotation of the crushing shaft 19 will also drive the impeller 35 to rotate. The rotation of the impeller 35 generates a strong airflow in the storage part 4. The airflow passes through the connecting tube 18 between the storage part 4 and the crushing tube 20, and can generate a negative pressure effect in the crushing tube 20. The formation of negative pressure causes the graphite particles in the crushing chamber 2 to be attracted to the crushing tube 20 under the action of the airflow. During the process of being sucked in, the graphite particles are alternately sheared by the crushing blade 1 23 and the crushing blade 2 24, thereby further completing the crushing process. After the graphite particles in the crushing tube 20 are crushed, they are screened through the screening ports 27 spaced apart on the wall of the crushing tube 20, and the graphite particles with smaller particle sizes can pass through the screening port. The opening 27 enters the connecting tube 18, and the graphite particles with larger particle size continue to be repeatedly crushed by the crushing blade 1 23 and the crushing blade 2 24 in the crushing chamber 2 until their size reaches the through hole requirement of the screening opening 27. In the storage part 4, the graphite particles are screened by the screening plate 8, and the screening plate 8 can guide the larger graphite particles to its bottom by gravity and airflow through the inclined installation method. At this time, the graphite particles that meet the particle size requirements are discharged through the outlet 9 of the storage part 4, and the larger graphite particles that do not meet the particle size requirements are transported back to the crushing chamber 2 by the circulation pipe 10 for repeated crushing. This cycle is repeated until all graphite particles are crushed to the required particle size and finally stored in the storage chamber 3 through the storage part 4. The whole device has high crushing efficiency and uniform crushing particle size; when the crushing shaft 19 rotates, the toothed ring 29 fixed thereon also rotates synchronously. In this process, the toothed ring 29 drives the rotating shaft 30 to rotate by meshing with the gear 31, and the rotation direction of the rotating shaft 30 is opposite to that of the toothed ring 29. Since the rotating shaft 30 is meshed with the meshing teeth 32, the crushing barrel 20 is driven to rotate in the opposite direction to the crushing shaft 19; when the user needs to add graphite particles to the feed port 15, the cover plate 16 is manually rotated to remove it from the feed port 15 to prevent foreign impurities or dust from entering the feed part 11, thereby ensuring the cleanliness of the crushing process.At the same time, when the equipment is not in use, the cover plate 16 can also protect the feed port 15 to prevent accidental objects from falling into the interior, further improving the safety of the equipment; the friction-increasing sleeve 36 increases the contact friction between the conveyor belt 34 and the crushing shaft 19, thereby effectively preventing the conveyor belt 34 from slipping when running at high speed; when the crushing shaft 19 rotates at high speed, the bearing 37 can greatly reduce the friction between the crushing shaft 19 and the housing 1, making the rotation of the crushing shaft 19 smoother, while avoiding vibration or noise problems caused by axis deviation; when the crushing shaft 19 rotates, The tube body 38 will also rotate synchronously. At this time, the tube body 38 will inhale gas from the external air into the tube body 38, and go down along the hollow structure of the crushing shaft 19, and finally guide the airflow to the storage part 4 through the air outlet 39 at the bottom, providing cooling airflow for the storage part 4 to prevent the impeller 35 from overheating due to long-term operation; when the screen plate 8 is impacted by graphite particles or equipment vibration, the moving block 40 can slide in the moving groove 41 along the direction of the guide rod 42, and rebound under the elastic action of the spring 43, thereby realizing the buffering function of the screen plate 8 and increasing the service life of the screen plate 8. At the same time, the vibration of the screen plate 8 can also shake off the graphite particles attached to the screen plate 8, avoid clogging of the screen holes, and improve the screening efficiency.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grinding device for graphite lithium battery negative electrode material, characterized in that: include: The housing (1) is internally divided into a crushing chamber (2) and a storage chamber (3), wherein the storage chamber (3) is located below the crushing chamber (2), and a storage portion (4) having a hollow structure is provided in the storage chamber (3); A crushing and conveying mechanism (5) is used to convey external graphite particles to the crushing chamber (2) and to coarsely crush the graphite particles during the conveying process; A pulverizing mechanism (6) is disposed in the pulverizing chamber (2) and is used to pulverize the graphite particles; A driving mechanism (7) is used to transmit power to the pulverizing mechanism (6), and at the same time, in the process of transmitting power, transport the air in the pulverizing chamber (2) and the graphite particles to the storage portion (4); and a screening plate (8) installed in the storage portion (4); an outlet (9) is provided on the storage portion (4); the outlet (9) is arranged below the screening plate (8); the storage portion (4) is connected to the pulverizing chamber (2) via a circulation pipe (10).

2. A graphite lithium battery negative electrode material pulverizing device according to claim 1, characterized in that: The crushing and conveying mechanism (5) comprises a feeding part (11), a crushing roller (12), a crushing protrusion (13) and a motor (14); The feeding part (11) is fixed on the top of the shell (1) and is connected to the pulverizing chamber (2); a feeding port (15) is provided on the top of the feeding part (11); The crushing roller (12) is rotatably arranged in the feeding part (11), and a plurality of crushing protrusions (13) are arranged at intervals along the circumference of the crushing roller (12). The crushing roller (12) is driven to rotate by the motor 1 (14).

3. A graphite lithium battery negative electrode material pulverizing device according to claim 2, characterized in that: A cover plate (16) is rotatably provided at the top of the feed portion (11), and the cover plate (16) is elastically abutted by a torsion spring (17) so that the cover plate (16) elastically covers the feed port (15).

4. A graphite lithium battery negative electrode material pulverizing device according to claim 1, characterized in that: The pulverizing mechanism (6) comprises a connecting tube (18), a pulverizing shaft (19), a pulverizing tube (20), a pulverizing bracket (21), a pulverizing blade 1 (23) and a pulverizing blade 2 (24); The first end of the pulverizing shaft (19) passes through the top wall of the pulverizing chamber (2) and is rotatably connected to the housing (1); The crushing support (21) is composed of at least four C-shaped plates (22), the tops of the four plates (22) are fixed on the crushing shaft (19), and a plurality of crushing blades (23) are arranged at intervals along the height direction of the inner wall of the plate (22); A plurality of the second crushing blades (24) are arranged at intervals along the circumference of the crushing cylinder (20); the crushing cylinder (20) is arranged in the fourth plate body (22); a rotating ring (25) is fixed at the bottom of the crushing cylinder (20); a rotating groove (26) suitable for the rotation of the rotating ring (25) is provided at the bottom of the fourth plate body (22); the first crushing blade (23) and the second crushing blade (24) are arranged in a staggered manner in the height direction; and a plurality of screening openings (27) are arranged at intervals on the crushing cylinder (20); The connecting tube (18) is fixed on the shell (1), the top of the connecting tube (18) is connected to the bottom of the crushing tube (20), the bottom of the connecting tube (18) is connected to the storage portion (4), and the second end of the crushing shaft (19) passes through the connecting tube (18) and movably extends to the storage portion (4).

5. A graphite lithium battery negative electrode material pulverizing device according to claim 4, characterized in that: The driving mechanism (7) comprises a second motor (33), a conveyor belt (34) and an impeller (35); The second motor (33) is installed on the top of the housing (1), and the conveyor belt (34) is sleeved between the second end of the crushing shaft (19) and the output end of the second motor (33); The impeller (35) is fixed to the second end of the pulverizing shaft (19) and is movably disposed in the storage portion (4).

6. A graphite lithium battery negative electrode material pulverizing device according to claim 5, characterized in that: A friction-enhancing sleeve (36) is fixed on the pulverizing shaft (19), and the conveyor belt (34) is sleeved between the friction-enhancing sleeve (36) and the output end of the second motor (33).

7. A graphite lithium battery negative electrode material pulverizing device according to claim 5, characterized in that: A bearing (37) is fixed on the housing (1), and the inner ring of the bearing (37) is coaxially fixed with the outer ring of the pulverizing shaft (19).

8. The graphite lithium battery negative electrode material pulverizing device according to claim 5, characterized in that: The pulverizing shaft (19) is of a hollow structure. An arc-shaped tube body (38) is provided at the top of the pulverizing shaft (19). The tube body (38) connects the inside of the pulverizing shaft (19) with the outside. An air outlet (39) is provided at the bottom of the pulverizing shaft (19). The air outlet (39) is connected with the inside of the storage portion (4).

9. The graphite lithium battery negative electrode material pulverizing device according to claim 1, characterized in that: The screening plate (8) is installed in the storage portion (4) in an inclined manner.

10. A graphite lithium battery negative electrode material pulverizing device according to claim 9, characterized in that: A moving block (40) is fixed at the end of the screening plate (8), a moving groove (41) is provided in the screening plate (8), the moving block (40) is slidably arranged in the moving groove (41), a guide rod (42) is fixed in the moving groove (41), the guide rod (42) movably passes through the moving block (40), and the moving block (40) is elastically abutted by a spring (43).

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