New energy positive electrode material wet grinding medium backflow system and separation filter

Abstract

The invention discloses a new energy positive electrode material wet grinding medium backflow system and a separation filter, relates to the technical field of wet grinding, and aims at the basic principle of wet grinding and takes a screen structure as a basis, but the difference in the invention is that the diameter of a screen is in a fluctuation change state; the central guide rod is additionally arranged on the basis of the central point of the screen, and in the actual operation process, according to the pressure change caused by the blockage problem, the pressure for pumping mixed materials is used as the basis, and in the state that the pressure has obvious fluctuation, the central guide rod is driven to rotate instantly in an instant pressure release mode; further, the change of centrifugal force and the direction of a gravity field are utilized, a pendulum bob rod is used for exerting vibration sense on the inner wall of the screen, then instantly released pressure is utilized for driving a rubber expansion ring to rapidly expand so as to achieve the purpose of impacting the outer wall of the screen, and the overall purpose is to eliminate the blocking problem on the screen through the vibration sense; and the anti-blocking effect is provided by further changing the position of a vibration applying point.

Description

Technical Field

[0001] The present invention relates to the technical field of wet grinding, and in particular to a medium reflux system and a separation filter for wet grinding of new energy positive electrode materials. Background Art

[0002] Description of the wet grinding process of lithium materials (new energy positive electrode materials): The physical crushing of lithium materials can reach the micron level by providing extrusion force and shear force with grinding media such as zirconium beads. During the specific operation process, considering the loss of grinding media (zirconium beads) and the recovery of grinding materials, a recovery system is conventionally used for material / medium recovery and medium replenishment. Please refer to the relevant content in Publication No. CN109622363A.

[0003] The grinding media recovery method specifically includes two structural forms: screen and no screen. The screen is usually in the middle of the rotor inside the equipment. When using smaller grinding media, the equipment will face high cavity pressure and easily clog the filter. When the screen is clogged, the equipment must be shut down for maintenance and cleaning of the screen. Removing the screen is labor-intensive and time-consuming and difficult to clean. In the no-screen structure, the centrifugal turbine inside the equipment is mainly used to separate the material and the grinding media. However, there are great disadvantages in actual production and use. Only products with very low viscosity and some products with a large specific gravity can be used. Zirconium beads will still leak into the material, and the actual use effect is very poor. A solution is proposed for this. Summary of the Invention

[0004] The purpose of the present invention is to provide a wet grinding medium reflux system and a separation filter for new energy positive electrode materials. In the wet grinding process of new energy positive electrode materials, the grinding medium causes clogging of the screen, and the cleaning process of the screen is labor-intensive and time-consuming, which is not conducive to the actual production process.

[0005] The object of the present invention can be achieved by the following technical solution: a separation filter is used in the wet grinding process of new energy positive electrode materials, comprising a cylinder and a pressure measuring assembly, wherein the cylinder is provided with a mixing feed port, a material port and a medium nozzle in sequence from top to bottom, and the cylinder is maintained in a vertical direction;

[0006] A screen is installed inside the cylinder along its length, and a return bin corresponding to the material port is formed between the inner wall of the cylinder and the outer wall of the screen, and an empty bin and a storage bin corresponding to the mixing feed port and the medium nozzle are formed at the upper and lower ends of the cylinder corresponding to the screen.

[0007] The diameter of the screen fluctuates in the up and down directions, and the screen includes an inverted position and a pressure position. The screen has sieve holes at the inverted position. A central guide rod is provided in the cylinder corresponding to the center point of the screen. A movable sleeve is provided at the inverted position corresponding to the central guide rod. A pendulum rod is provided on the movable sleeve. A rubber expansion ring is installed at the pressure position corresponding to the inner wall of the cylinder.

[0008] It is further configured as follows: a one-way check valve is installed at the lower end position of the screen corresponding to the inside of the storage bin, a booster assembly is installed at the external position of the cylinder corresponding to the storage bin, a hose is arranged between the empty silo and the rubber expansion ring, and a solenoid valve assembly is installed on the hose.

[0009] It is further configured that: the upper end of the central guide rod maintains a rotational connection with the cylinder, and the central guide rod is provided with a turbine assembly at a position corresponding to the upper side of the empty silo.

[0010] It is further configured that: a sealing ring is installed at the intersection of the return bin and the storage bin corresponding to the screen.

[0011] It is further configured that: a directional pin is formed between the inner wall of the movable sleeve and the outer wall of the central guide rod, and the movable sleeve has a sliding action in the upper and lower directions at the outer wall of the central guide rod through the directional pin but does not have a rotating action.

[0012] It is further configured as follows: a fixed ring is installed on the outer wall of the movable sleeve, the upper and lower ends of the pendulum rod are spherical, and a movable connection is formed between the sphere at the upper end of the pendulum rod and the fixed ring.

[0013] It is further configured as follows: the length of the pendulum rod is equal to the horizontal distance between the outer wall of the movable sleeve and the pressure position, the reversely inclined position is symmetrically arranged along the pressure position, and the diameter of the screen corresponding to the reversely inclined position increases or decreases from top to bottom.

[0014] It is further configured as follows: a hammer rod is installed on the outer wall of one side of the rubber expansion ring, and the center point of the hammer rod and the center point of the pressure position are on the same horizontal axis.

[0015] The present invention also proposes a wet grinding medium reflux system for new energy positive electrode materials, which is used in the wet grinding process of new energy positive electrode materials. In the wet grinding process of new energy positive electrode materials, a mixed material containing grinding media and grinding materials is obtained through a wet sand grinding structure, and is pumped into the screen through a mixing feed port in a pressurized form. The mixed material is separated by the screen, the grinding media enters the storage bin, the grinding materials enter the return bin, and the grinding media or grinding materials are wet sanded in the structure. In the process of separating the grinding media and the grinding materials, the start-up state of the solenoid valve assembly is controlled according to the pressure change in the empty bin.

[0016] The present invention has the following beneficial effects:

[0017] 1. For the wet grinding process of new energy cathode materials, the main separation process is the subsequent separation of grinding media (haozhu) and grinding materials. The separation method with a screen structure is the main one. The key is to avoid the related negative effects caused by screen blockage. The overall solution is based on the conventional filtration separation principle. After the mixed material passes through the screen, the material and the medium are fully separated. The screen structure in the present invention is different from the conventional screen structure. Specifically, the outer diameter of the screen is in a fluctuating state and does not directly affect the filtration process. The overall process mainly eliminates the blockage problem on the screen by applying vibration, and the inner wall position of the screen is set to a relatively inclined design, the purpose of which is to facilitate the falling of the vibration-dropped grinding medium;

[0018] 2. The key of the present invention is to utilize the pressure changes generated when the mixed material is pumped into the screen structure. In the initial state, the inside of the rubber expansion ring is not connected to the internal space of the screen. However, when the screen is blocked, the internal pressure of the screen continues to rise. In this state, the internal pressure of the screen is released instantly, and the movable sleeve on the center guide rod is driven to rotate rapidly. In this way, the centrifugal force and the gravitational field are used to make the pendulum rod quickly impact the inside of the screen. Secondly, the instantly released pressure is used to drive the rubber expansion ring to expand rapidly to achieve the purpose of hitting the outer wall of the screen. The overall purpose is to use the sense of vibration to eliminate the blockage problem on the screen, and further change the position of the vibration application point to achieve the anti-blocking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic structural diagram of the separation filter proposed by the present invention;

[0021] Figure 2 for Figure 1 Cross-section of the middle cylinder;

[0022] Figure 3 for Figure 2 Cross-section of the middle screen;

[0023] Figure 4 for Figure 3 Front view of

[0024] Figure 5 for Figure 2 Schematic diagram of the structure of the middle movable sleeve;

[0025] Figure 6 for Figure 4 Schematic diagram of the structure of part A.

[0026] In the figure: 1. Cylinder; 101. Mixing feed port; 102. Material port; 103. Medium nozzle; 104. Empty silo; 105. Return silo; 106. Storage silo; 2. Booster assembly; 3. Solenoid valve assembly; 4. Center guide rod; 5. Screen; 501. Reverse tilt position; 502. Pressure position; 6. Rubber expansion ring; 601. Hammer rod; 7. One-way check valve; 8. Movable sleeve; 9. Fixed ring; 10. Pendulum rod. DETAILED DESCRIPTION

[0027] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example 1: In the wet grinding process of new energy cathode materials, due to the problem of clogging of the screen by the grinding medium, the cleaning process of the screen is labor-intensive and time-consuming, which is not conducive to the actual production process. The following technical solution is proposed:

[0029] Reference Figures 1 to 6 The separation filter in this embodiment is used in the wet grinding process of new energy positive electrode materials, and includes a cylinder 1 and a pressure measuring assembly. The cylinder 1 is provided with a mixing feed port 101, a material port 102, and a medium nozzle 103 in sequence from top to bottom, and the cylinder 1 is maintained in a vertical direction.

[0030] A screen 5 is installed inside the cylinder 1 along its length, and a return bin 105 corresponding to the material port 102 is formed between the inner wall of the cylinder 1 and the outer wall of the screen 5. An empty bin 104 and a storage bin 106 corresponding to the mixing feed port 101 and the medium nozzle 103 are formed at the upper and lower ends of the cylinder 1 corresponding to the screen 5.

[0031] The diameter of the screen 5 fluctuates in the up and down directions, and the screen 5 includes an inverted position 501 and a pressure position 502. The screen 5 has a sieve hole at the inverted position 501. A central guide rod 4 is provided in the cylinder 1 at the position corresponding to the center point of the screen 5. The central guide rod 4 is provided with a movable sleeve 8 at the inverted position 501. A pendulum rod 10 is provided on the movable sleeve 8, and springs are provided on the upper and lower sides of the movable sleeve 8. A rubber expansion ring 6 is installed on the inner wall of the cylinder 1 at the pressure position 502. A one-way check valve 7 is installed at the lower end position of the screen 5 corresponding to the inside of the storage bin 106. A booster assembly 2 is installed on the cylinder 1 at the external position of the storage bin 106. A hose is provided between the empty bin 104 and the rubber expansion ring 6, and an electromagnetic valve assembly 3 is installed on the hose.

[0032] In the wet grinding process of new energy positive electrode materials, a mixture containing grinding media and grinding materials is obtained through a wet sand grinding structure, and is pumped into the screen 5 through the mixing feed port 101 in a pressurized form. The mixed material is separated by the screen 5, and the grinding media enters the storage bin 106 and the grinding materials enter the return bin 105. The grinding media or grinding materials are finally returned to the wet sand grinding structure. In the process of separating the grinding media and the grinding materials, the start-up state of the solenoid valve assembly 3 is controlled according to the pressure change in the empty bin 104.

[0033] Basic principle: The separation filter proposed in this embodiment is mainly used as a separation process for the subsequent mixed materials in the conventional wet grinding process. Since the wet grinding process mainly uses the grinding medium (haozhu) to increase the shear force, when discharging the mixed materials after grinding, on the one hand, the ground materials after grinding are recovered, and on the other hand, the grinding medium therein needs to be recovered and replenished according to the degree of wear of the grinding medium. Specifically, the recovered grinding medium can be pumped into the wet sand grinding structure through the booster component 2, and the one-way check valve 7 is mainly used to prevent the grinding medium in the storage bin 106 from flowing back into the internal space of the screen 5. This part belongs to the basic knowledge of the wet grinding process;

[0034] The separation filter proposed in the present invention is essentially based on the screen 5. The mixed material is pumped into the cylinder 1 by a device such as a diaphragm pump. Under the dual effects of pressure and the weight of the material itself, the grinding medium is trapped inside the screen, and the ground material enters the return bin 105. In theory, if the screen 5 has no obvious blockage problem, then there is no obvious difference in pressure inside and outside the screen 5. On the contrary, if the screen 5 has a blockage problem, the pressure inside the screen 5 will increase significantly. This part is the basic content of the present invention.

[0035] The present invention is to prevent the screen 5 from being blocked by the principle of vibration removal. If a blockage problem occurs, there is no need to remove the screen 5 for cleaning. Instead, the grinding media blocked in the screen hole can be shaken off by directly applying vibration and fall naturally.

[0036] Example 2: The following describes the actions of the central guide rod when the screen is blocked:

[0037] The upper end of the center guide rod 4 maintains a rotational connection with the cylinder 1, and the center guide rod 4 is installed with a turbine assembly at the upper position of the empty bin 104, and the screen 5 is installed with a sealing ring at the intersection of the return bin 105 and the storage bin 106. A directional pin is formed between the inner wall of the movable sleeve 8 and the outer wall of the center guide rod 4, and the movable sleeve 8 has a sliding action in the up and down direction at the outer wall of the center guide rod 4 through the directional pin but does not have a rotating action.

[0038] Solution description: In the initial state, that is, the screen 5 has no blockage problem, the entire screen 5 is only connected to the empty material bin 104 and the return material bin 105, and the gap between the screen 5 and the storage bin 106 is sealed by the one-way check valve 7, so there is no obvious pressure change inside and outside the screen 5;

[0039] On the contrary, when the screen 5 is blocked over a large area, because the mixed material is continuously pumped in by a device such as a diaphragm pump, there will be a problem of pressure accumulation inside the cylinder 1. However, the pressure will eventually flow out through the material port 102. Therefore, after the blockage problem occurs, the pressure inside the screen 5 continues to rise, and after reaching the peak, the air path between the screen 5 and the rubber expansion ring 6 can be realized by opening the solenoid valve assembly 3.

[0040] Essentially, the gas passage is a one-way passage. The gas inside the gas passage screen 5 is released and eventually quickly enters the empty silo 104-hose and is evenly distributed to each rubber expansion ring 6. The rapid passage of gas is essentially an instantaneous release of air pressure. When the gas passes through the turbine, it drives the central guide rod 4 to rotate rapidly, and secondly, it drives the rubber expansion ring 6 to expand and deform.

[0041] As shown in Example 1, the key content of the present invention lies in the vibration process, and the kinetic energy of the vibration process is mainly expressed as the "explosive impact force" generated at the instant of the above-mentioned air pressure. If the blockage problem is eliminated by applying vibration, and when the diaphragm pump continues to pump in the mixed material, the internal pressure of the screen 5 continues to rise, and the rubber expansion ring 6 will be squeezed to reset it, and the return port 102 can also be used to relieve the pressure inside the cylinder 1.

[0042] Example 3: Based on Example 1 and Example 2, the vibration anti-blocking process is described:

[0043] A fixed ring 9 is installed on the outer wall of the movable sleeve 8, and the upper and lower ends of the pendulum rod 10 are spherical, and a movable connection is formed between the sphere at the upper end of the pendulum rod 10 and the fixed ring 9. The length of the pendulum rod 10 is equal to the horizontal distance between the outer wall of the movable sleeve 8 and the pressure position 502. The reversed oblique position 501 is symmetrically arranged along the pressure position 502. The diameter of the screen 5 corresponding to the reversed oblique position 501 increases or decreases from top to bottom. A hammer rod 601 is installed on the outer wall of one side of the rubber expansion ring 6, and the center point of the hammer rod 601 and the center point of the pressure position 502 are on the same horizontal axis.

[0044] Solution Description: Refer to Figure 5 and Figure 6To illustrate, when the central guide rod 4 rotates rapidly, the movable sleeve 8 will drive each pendulum rod 10 to rotate rapidly. Then, under the action of centrifugal force, the pendulum rod 10 will show a trend of continuing to tilt upward. The specific process is as follows:

[0045] S1: If Figure 4 As shown, each movable sleeve 8 is provided with springs at both ends. When the central guide rod 4 does not rotate, the movable sleeve 8 maintains a relatively balanced position by utilizing the elastic action of the two. Figure 6 It can be directly understood that: in the initial state, the position of the movable sleeve 8 is lower than the pressure position 502, and each pendulum rod 10 is in a naturally drooping state, ensuring that the ball at the lower end of the pendulum rod 10 maintains contact with the inner wall of the screen 5;

[0046] S2: If the central guide rod 4 rotates rapidly, theoretically the pendulum rod 10 tilts upward. However, in reality, due to the blocking effect of the inclined surface of the reverse tilt position 501, it is difficult for the pendulum rod 10 to tilt upward. In this state, the elastic balance maintained by the two springs is broken, and the movable sleeve 8 also tends to slide upward, ensuring that the ball at the lower end of the pendulum rod 10 hits the inner wall of the screen 5 in an undirected manner, thereby applying a vibration force from the inside to the outside to the screen 5.

[0047] As shown above, the pressure inside the screen 5 is released and eventually evenly distributed to the inside of each rubber expansion ring 6, which drives the rubber expansion ring 6 to expand rapidly. When the rubber expansion ring 6 expands rapidly, the hammer rod 601 moves rapidly in the horizontal direction pointing to the pressure position 502. The hammer rod 601 quickly strikes the outer wall of the screen 5, providing an impact force from the outside to the inside. Combined with the above-mentioned vibration force, its key purpose is to ensure that the grinding media blocked in the screen hole is shaken off.

[0048] The inclined surface design of the reverse inclined position 501 is further utilized to ensure that the shaken-off grinding media can fall naturally, avoiding the grinding media from continuing to adhere to the screen 5 due to the stickiness of the grinding materials, thereby causing secondary blockage in the subsequent separation process.

[0049] In summary: the basic principle of wet grinding is based on the screen structure, but the difference in the present invention is that the screen diameter shows a fluctuating change state, and a central guide rod is added based on the center point of the screen. In the actual operation process, according to the pressure change caused by the blockage problem, the pressure of the pumped mixed material is used as the basis. In the state where the pressure fluctuates significantly, the central guide rod is driven to rotate instantaneously by instantaneous pressure release, thereby further utilizing the centrifugal force change and the direction of the gravity field, and applying a vibration sense to the inner wall position of the screen with the pendulum rod. Secondly, the instantly released pressure is used to drive the rubber expansion ring to expand rapidly to achieve the purpose of hitting the outer wall of the screen. The overall purpose is to use the vibration sense to eliminate the blockage problem on the screen, and further change the position of the vibration application point to achieve the anti-blocking effect.

[0050] The above contents are merely examples and explanations of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they shall fall within the scope of protection of the present invention.

[0051] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0052] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A separation filter, used in a wet grinding process for anode materials of new energy, comprising a cylinder (1) and a pressure measuring assembly, characterized in that: The cylinder (1) is provided with a mixing feed port (101), a material port (102) and a medium nozzle (103) in sequence from top to bottom, and the cylinder (1) is maintained in a vertical direction; A screen (5) is installed inside the cylinder (1) along its length, and a return bin (105) corresponding to the material port (102) is formed between the inner wall of the cylinder (1) and the outer wall of the screen (5), and an empty bin (104) and a storage bin (106) corresponding to the mixing feed port (101) and the medium nozzle (103) are formed at the upper and lower ends of the cylinder (1) corresponding to the screen (5); The diameter of the screen (5) fluctuates in the vertical direction, and the screen (5) includes a reverse tilt position (501) and a pressure position (502). The screen (5) is provided with a screen hole at the reverse tilt position (501). A central guide rod (4) is provided in the cylinder (1) at a position corresponding to the center point of the screen (5). A movable sleeve (8) is provided on the central guide rod (4) at the reverse tilt position (501). A pendulum rod (10) is provided on the movable sleeve (8), and springs are provided at both upper and lower sides of the movable sleeve (8). A rubber expansion ring (6) is installed on the inner wall of the cylinder (1) at a position corresponding to the pressure position (502).

2. The separation filter according to claim 1, characterized in that The screen (5) is provided with a one-way check valve (7) at a lower end position inside the storage bin (106), the cylinder (1) is provided with a pressurizing assembly (2) at an external position of the storage bin (106), a hose is provided between the empty bin (104) and the rubber expansion ring (6), and a solenoid valve assembly (3) is provided on the hose.

3. The separation filter according to claim 1, characterized in that The upper end of the central guide rod (4) is in rotational connection with the cylinder (1), and a turbine assembly is installed on the central guide rod (4) corresponding to the upper side of the empty silo (104).

4. The separation filter according to claim 1, characterized in that A sealing ring is installed on the screen (5) at the intersection of the return bin (105) and the storage bin (106).

5. The separation filter according to claim 1, characterized in that A directional pin is formed between the inner wall of the movable sleeve (8) and the outer wall of the central guide rod (4), and the movable sleeve (8) has a sliding action in the up and down directions at the outer wall of the central guide rod (4) through the directional pin but does not have a rotating action.

6. The separation filter according to claim 5, characterized in that A fixed ring (9) is installed on the outer wall of the movable sleeve (8), and the upper and lower ends of the pendulum rod (10) are both spherical, and a movable connection is formed between the sphere at the upper end of the pendulum rod (10) and the fixed ring (9).

7. The separation filter according to claim 6, characterized in that The length of the pendulum rod (10) is equal to the distance between the outer wall of the movable sleeve (8) and the pressure position (502) in the horizontal direction, the reverse oblique position (501) is symmetrically arranged along the pressure position (502), and the diameter of the screen (5) corresponding to the reverse oblique position (501) increases or decreases from top to bottom.

8. The separation filter according to claim 1, characterized in that A hammer rod (601) is installed on the outer wall of one side of the rubber expansion ring (6), and the center point of the hammer rod (601) and the center point of the pressure position (502) are on the same horizontal axis.

9. A medium reflux system for wet grinding of new energy cathode materials, used in the wet grinding process of new energy cathode materials, and using the separation filter according to any one of claims 1 to 8, characterized in that: In the wet grinding process of new energy positive electrode materials, a mixed material containing grinding media and grinding material is obtained through a wet sand grinding structure, and is pumped into a screen (5) through a mixed feed port (101) in a pressurized form. The mixed material is separated by the screen (5), the grinding media enters a storage bin (106), and the grinding material enters a return bin (105). The grinding media or the grinding material is wet sanded in the structure, and in the process of separating the grinding media and the grinding material, the start-up state of the solenoid valve assembly (3) is controlled according to the pressure change in the empty bin (104).

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