Graded impact mill for narrowing particle size distribution of graphite material

Abstract

The utility model belongs to the technical field of graphite material processing equipment, and particularly relates to a grading impact mill for narrowing the particle size distribution of a graphite material. The grading impact mill comprises a tank body, a feeding hole is formed in the upper end of the tank body, and a discharging pipe is arranged at the lower end of the tank body; a buffer ring structure, a scattering structure and a screening structure are arranged in the tank body from top to bottom; the buffering ring structure comprises a fixing ring and a plurality of transverse rods which are arranged in the fixing ring and distributed in the radial direction. Through the arrangement of the buffer ring structure, raw materials falling to the scattering structure are pre-scattered and decelerated, so that the abrasion to the scattering structure is reduced, and the service life of the device is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to graphite material processing equipment technical field, concretely relates to a kind of for narrowing graphite material particle size distribution's classification impact mill. BACKGROUND

[0002] As a kind of excellent electric conductor, graphite negative electrode material has a wide application in lithium ion production, and becomes market mainstream negative electrode material due to its cost, cycle performance, safety performance, charging and discharging rate advantage, and occupies high share of market stably.To maintain the market share of graphite, the comprehensive performance of graphite needs to be improved to gain more competitive power in market subsequently. Among them, the particle size and uniformity of graphite material are important early-stage processing indicators, and narrower particle size distribution helps to shorten the channel of lithium ion insertion and extraction, which is conducive to quickly reaching full lithium insertion state, thereby improving charging and discharging performance, and also improving the cycle performance of battery.

[0003] Among them, the classification impact mill is an important equipment for dispersing and classifying graphite raw materials. The document with authorized announcement number CN217249345U discloses a calcium carbonate dispersing and classifying machine, which includes a cylinder and a feed pipe arranged on the outer peripheral wall of the cylinder. The top of the cylinder is provided with a discharge pipe. The bottom of the cylinder is provided with an air inlet fan. The end of the discharge pipe away from the cylinder is provided with an air induction fan for pulling the material towards the direction close to the discharge pipe. A rotating shaft is rotatably arranged inside the cylinder. The outer edge of the rotating shaft is provided with a crushing piece for dispersing the material. The outer side wall of the cylinder is provided with a drive motor for driving the rotating shaft to rotate. The inner peripheral wall of the cylinder is provided with a sliding ring groove. A filter screen is slidably arranged inside the sliding ring groove along the length direction of the cylinder. The filter screen is located between the feed pipe and the discharge pipe.

[0004] The working principle of the screening device in the device is as follows: the raw material is introduced into the cylinder, and the drive motor drives the crushing piece to rotate to crush and disperse the raw material. The air inlet fan and the air induction fan are started to make the airflow in the cylinder move the raw material towards the discharge pipe. The raw material collides with the filter screen during the movement, and the raw material meeting the size requirement passes through the filter screen and is discharged through the discharge pipe. The raw material not meeting the requirement falls to the crushing piece again for crushing, so that the size of the finished product tends to be consistent, and the production efficiency of the finished product quality is improved.

[0005] However, the device still has the following problems: calcium carbonate raw material is light, which is easily affected by wind force, and the impact force on the crushing piece is also small. However, if the device is applied to graphite, the impact force on the crushing piece will be greatly improved due to the heavy quality of graphite, and the crushing piece is easily worn, which leads to the reduction of the service life of the device. UTILITY MODEL CONTENTS

[0006] In view of the above problems, the utility model discloses a kind of classified impact mill for narrowing graphite material particle size distribution, by the setting of buffer ring structure, raw material first pre-scattering and deceleration are carried out to the scattering structure place that falls, reduce the wear of scattering structure, it is favorable to promote the life of device.

[0007] In order to achieve the above object, the technical scheme of the utility model is as follows:

[0008] A kind of classified impact mill for narrowing graphite material particle size distribution, including tank body, the upper end of the tank body is provided with feed inlet, the lower end of the tank body is provided with discharge pipe;Buffer ring structure, scattering structure and screening structure are arranged from top to bottom in the tank body;The buffer ring structure includes fixed ring and the multiple horizontal bars distributed in the fixed ring and along radial direction.

[0009] As a further preferred embodiment of the utility model, the tank body includes the upper tank body with the feed inlet, the buffer ring structure is installed, and the lower tank body with the discharge pipe, the scattering structure and screening structure are installed;The upper tank body and lower tank body are connected by flange plate.

[0010] As a further preferred embodiment of the utility model, the buffer ring structure further includes reinforcing ring concentrically arranged with the fixed ring and smaller in diameter than the fixed ring, and the reinforcing ring has through holes for the horizontal bars to pass through.

[0011] As a further preferred embodiment of the utility model, the buffer ring structure further includes mounting block arranged on the outer circumferential side of the fixed ring, and mounting groove arranged on the inner wall of the tank body and used for embedding the mounting block;The height of the mounting groove is greater than the height of the mounting block.

[0012] As a further preferred embodiment of the utility model, the buffer ring structure further includes fixed rod arranged in the mounting groove and vertically distributed, and channel arranged on the mounting block and allowing the fixed rod to pass through.

[0013] As a further preferred embodiment of the utility model, the buffer ring structure further includes support spring sleeved on the fixed rod, and connected with mounting block and mounting groove at both ends.

[0014] As a further preferred embodiment of the utility model, the upper surface of the fixed ring is inclined from outside to inside, and the lowest part of the upper surface of the fixed ring is higher than the upper surface of the horizontal bar.

[0015] As a further preferred embodiment of the utility model, the scattering structure includes shaft body horizontally arranged in the tank body and rotationally connected with the tank body, multiple pin bars distributed on the shaft body, and motor for driving the shaft body to rotate.

[0016] As a further preferred embodiment of this invention, the distance between two adjacent pins decreases from the center of the tank towards the side wall of the tank.

[0017] As a further preferred embodiment of the present invention, the screening structure includes a conical cylinder, a plurality of screening holes disposed on the cylinder wall of the conical cylinder, a conveying pipe disposed at the lower end of the conical cylinder, and an outlet disposed on the side wall of the tank body for passage through the conveying pipe.

[0018] The beneficial effects of this utility model are as follows:

[0019] The graded impact mill provided by this utility model uses a buffer ring structure to pre-disperse and decelerate the raw materials falling onto the dispersing structure, thereby reducing wear on the dispersing structure and improving the lifespan of the device.

[0020] The graded impact mill provided by this utility model not only enhances the dispersing effect of the buffer ring structure through the optimization of the buffer ring structure and the dispersing structure, but also promotes the control of the particle size distribution of the raw materials by the dispersing structure. By narrowing the particle size distribution, it ultimately achieves the purpose of improving the charging and discharging performance and cycle performance of the battery. Attached Figure Description

[0021] Appendix Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Appendix Figure 2 This is a three-dimensional structural diagram of the buffer ring structure of this utility model.

[0023] Appendix Figure 3 This is a partial structural schematic diagram of the present invention.

[0024] Appendix Figure 4 This is an enlarged view of part A of the structure of this utility model.

[0025] Attached diagram descriptions: 1. Tank body; 2. Buffer ring structure; 3. Dispersing structure; 4. Screening structure;

[0026] 11. Inlet; 12. Outlet pipe; 13. Upper tank; 14. Lower tank; 15. Flange.

[0027] 21. Fixing ring, 22. Crossbar, 23. Reinforcing ring, 24. Mounting block, 25. Mounting groove, 26. Fixing rod, 27. Channel, 28. Supporting spring;

[0028] Shaft 31, pin 32, motor 33;

[0029] 41. Conical cylinder, 42. Screening hole, 43. Conveying pipe, 44. Outlet, 45. Valve body, 46. Recovery pipe, 47. Pump body. Detailed Implementation

[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] This embodiment provides a graded impact mill for narrowing the particle size distribution of graphite materials, as shown in the attached figure. Figure 1 ~Appendix Figure 3 As shown, it includes a tank body 1, with a feed inlet 11 at the upper end and a discharge pipe 12 at the lower end; the tank body 1 is provided with a buffer ring structure 2, a dispersing structure 3 and a screening structure 4 from top to bottom.

[0034] As a further preferred embodiment, the tank 1 includes an upper tank 13 having the feed inlet 11 and the buffer ring structure 2, and a lower tank 14 having the discharge pipe 12 and the dispersing structure 3 and the screening structure 4; the upper tank 13 and the lower tank 14 are connected by a flange 15. The purpose of dividing the tank 1 into a split structure consisting of the upper tank 13 and the lower tank 14 is to facilitate the disassembly and maintenance of the structures within the upper tank 13 and the lower tank 14 respectively, reducing maintenance difficulty and cost; the flange 15 connects the two tanks, facilitating disassembly and achieving a sealed connection between the two tanks. The specific structure of the flange 15 can be directly referred to in the prior art, so it will not be described in detail in this embodiment. The feed inlet 11 is the same size as the inner cavity of the tank body 1, which facilitates rapid feeding. However, depending on the needs of the actual scenario, a shielding structure can be set at the upper end of the feed inlet 11 for dust prevention. The setting of the shielding structure is a routine operation for those skilled in the art, so it does not need to be described in detail in this embodiment. The discharge pipe 12 is used to output qualified raw materials. A solenoid valve can be set at the discharge pipe 12 to control the discharge process. Furthermore, the part of the lower tank body 14 near the discharge pipe 12 can be set in a funnel shape to achieve rapid discharge and prevent material accumulation.

[0035] In this embodiment, the buffer ring structure 2 includes a fixed ring 21 and a plurality of crossbars 22 disposed within the fixed ring 21 and distributed radially. The fixed ring 21 is connected to the inner wall of the tank 1, and the connection method can be a fixed connection, such as welding or bonding, or a detachable connection, such as bolt connection. A detachable connection allows for replacement of the buffer ring structure 2 after multiple uses, and is therefore preferred. The number of crossbars 22 ranges from 4 to 12, distributed radially, and spaced evenly. The advantage of this design is that, considering the heavy and easily agglomerated nature of graphite raw materials, the agglomerated lumps are hard and would cause significant wear on the dispersing structure if they fell directly onto it. The dispersing structure itself is expensive, and the equipment maintenance costs are high. Therefore, a buffer ring structure 21 is installed at the upper end of the dispersing structure. The raw material first collides with the buffer ring structure 21, which can promote the dispersion of the raw material and reduce the speed at which the raw material falls onto the dispersing structure, thus reducing the wear caused by the collision. In addition, hard lumps that cannot be dispersed and are large in size will be intercepted by the crossbar 22 to prevent them from falling onto the dispersing structure and increasing wear.

[0036] In this embodiment, the dispersing structure 3 includes a shaft 31 horizontally disposed within the tank 1 and rotatably connected to the tank 1, a plurality of pins 32 distributed on the shaft 31, and a motor 33 for driving the shaft 31 to rotate. The shaft 31 is connected to the motor 33 via bearings. The shaft 31 and the pins 32 can be made of metal materials such as stainless steel to ensure the strength of the dispersing structure. When the motor 33 starts and drives the shaft 31 to rotate, the rotating pins 32 contact and collide with the raw material, thereby dispersing the material. The dispersing structure 3 can be singular, primarily serving a dispersing function; it can also be two or more, arranged side-by-side with adjacent structures rotating in opposite directions. This further grinds the raw material to the target particle size, in addition to dispersing. Therefore, the number of dispersing structures is mainly determined by the needs of the actual application scenario.

[0037] In this embodiment, the screening structure 4 includes a conical cylinder 41, multiple screening holes 42 disposed on the cylinder wall of the conical cylinder 41, a conveying pipe 43 disposed at the lower end of the conical cylinder 41, and an outlet 44 disposed on the side wall of the tank body 1 for passage through the conveying pipe 43. The screening holes 42 are used to screen out raw materials of the target particle size, which fall to the bottom and are discharged and collected by the discharge pipe 12, while unqualified raw materials are directly discharged outside the tank body 1 by the conveying pipe 43 for collection. Furthermore, to facilitate the discharge of unqualified raw materials, the conveying pipe 43 is inclined; a valve body 45 may also be provided on the conveying pipe 43 to control the discharge process; the lower part of the conveying pipe 43 is connected to a recovery pipe 46, and the end of the recovery pipe 46 away from the conveying pipe 43 is connected to the inlet 11 to facilitate the re-injection of unqualified raw materials into the upper part of the tank body 1 for dispersing and screening; a pump body 47 is provided on the recovery pipe 46 to provide power for lifting the unqualified raw materials.

[0038] In a preferred embodiment, the buffer ring structure 2 further includes a reinforcing ring 23 concentrically arranged with the fixing ring 21 and having a smaller diameter than the fixing ring 21. The reinforcing ring 23 has a through hole through which the crossbar 22 passes. This arrangement helps to strengthen the overall connection strength of the buffer ring structure.

[0039] In a preferred embodiment, the buffer ring structure 2 further includes a mounting block 24 disposed on the outer periphery of the fixing ring 21, a mounting groove 25 disposed on the inner wall of the tank 1 for embedding the mounting block 24, a fixing rod 26 disposed within the mounting groove 25 and vertically distributed, a channel 27 disposed on the mounting block 24 through which the fixing rod 26 passes, and a support spring 28 sleeved on the fixing rod 26 and connected at both ends to the mounting block 24 and the mounting groove 25 respectively. The height of the mounting groove 25 is greater than the height of the mounting block 24 to provide space for the mounting block 24 to move vertically; the fixing rod 26 is detachably connected to the mounting groove 25 to facilitate the installation and removal of the mounting block 24. Two support springs 28 are located within each mounting groove 25, respectively on the upper and lower sides of the mounting block 24, providing a buffering effect. The buffer ring structure 2 achieves the following effect: after the raw material is fed in, it impacts the crossbar 22 or the reinforcing ring 23. The force is transmitted to the mounting block 24, causing it to move downwards and compress the lower support spring 28, while the upper support spring 28 is stretched. This creates an unbalanced state, causing the fixed ring 21 to vibrate up and down. The vibration helps to disperse the raw material and prevents it from accumulating on the buffer ring structure. This structure utilizes the gravity of the falling raw material to achieve the vibration effect, eliminating the need for an additional power structure and offering advantages such as simple operation and low cost.

[0040] In a preferred embodiment, the upper surface of the fixing ring 21 is inclined from the outside in, and the lowest point of the upper surface of the fixing ring 21 is higher than the upper surface of the crossbar 22. This arrangement aims to cause the raw material remaining on the upper surface of the fixing ring 21 to slide off, preventing material accumulation.

[0041] In a preferred embodiment, the distance between two adjacent pins 32 decreases from the center of the tank 1 towards the side wall of the tank 1. This is because the arrangement of the crossbars 22 results in a smaller distance between the two crossbars 22 closer to the center of the tank 1 and a larger distance between the two crossbars 22 farther from the center. Therefore, when the material falls onto the dispersing structure, the particle size of the raw material closer to the center is smaller. In order to maximize the effect of the dispersing structure, the number and density of pins farther from the center are increased accordingly, which makes it easier to control the particle size distribution of the target material within a target range (15%), thereby improving the charge-discharge performance and cycle performance of the battery.

[0042] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A classification impact mill for narrowing the particle size distribution of graphite material, comprising a tank body (1), the upper end of the tank body (1) is provided with a feeding port (11), the lower end of the tank body (1) is provided with a discharging pipe (12); characterized in that: The tank body (1) is provided with a buffer ring structure (2), a scattering structure (3) and a screening structure (4) from top to bottom; the buffer ring structure (2) comprises a fixed ring (21) and a plurality of horizontal rods (22) distributed in the fixed ring (21) in the radial direction; The scattering structure (3) comprises a shaft body (31) horizontally arranged in the tank body (1) and rotationally connected with the tank body (1), a plurality of rod pins (32) distributed on the shaft body (31), and a motor (33) for driving the shaft body (31) to rotate.

2. A staged impact mill for narrowing the particle size distribution of a graphite material according to claim 1, characterized in that: The tank body (1) comprises an upper tank body (13) provided with the feed inlet (11) and the buffer ring structure (2), and a lower tank body (14) provided with the discharge pipe (12) and the scattering structure (3) and the screening structure (4); the upper tank body (13) and the lower tank body (14) are connected by a flange (15).

3. A staged impact mill for narrowing the particle size distribution of a graphite material according to claim 2, characterized in that: The buffer ring structure (2) further comprises a reinforcing ring (23) concentrically arranged with the fixed ring (21) and having a smaller diameter than the fixed ring (21), and the reinforcing ring (23) is provided with through holes for the horizontal rods (22) to pass through.

4. The impact mill for classifying graphite material according to any one of claims 1 to 3, characterized in that: The buffer ring structure (2) further comprises a mounting block (24) arranged on the outer circumferential side of the fixed ring (21), and a mounting groove (25) arranged on the inner wall of the tank body (1) and used for embedding the mounting block (24); the height of the mounting groove (25) is greater than the height of the mounting block (24).

5. A staged impact mill for narrowing the particle size distribution of a graphite material according to claim 4, characterized in that: The buffer ring structure (2) further comprises a fixed rod (26) arranged in the mounting groove (25) and vertically distributed, and a passage (27) arranged on the mounting block (24) and allowing the fixed rod (26) to pass through.

6. A staged impact mill for narrowing the particle size distribution of a graphite material according to claim 5, characterized in that: The buffer ring structure (2) further comprises a support spring (28) sleeved on the fixed rod (26) and connected with the mounting block (24) and the mounting groove (25) at both ends.

7. A staged impact mill for narrowing the particle size distribution of a graphite material according to claim 4, characterized in that: The upper surface of the fixed ring (21) is arranged from outside to inside, and the lowest part of the upper surface of the fixed ring (21) is higher than the upper surface of the horizontal rod (22).

8. A staged impact mill for narrowing the particle size distribution of a graphite material according to claim 1, characterized in that: The distance between two adjacent rod pins (32) decreases from the center of the tank body (1) to the side wall of the tank body (1).

9. A staged impact mill for narrowing the particle size distribution of a graphite material according to claim 1, characterized in that: The screening structure (4) comprises a conical cylinder (41), a plurality of screening holes (42) arranged on the cylinder wall of the conical cylinder (41), a material conveying pipe (43) arranged at the lower end of the conical cylinder (41), and an outlet (44) arranged on the side wall of the tank body (1) and used for passing through the material conveying pipe (43).

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