Graphite negative electrode particle precision grading device

Abstract

This invention discloses a precise grading device for graphite anode particles, belonging to the field of lithium battery material processing technology. It includes a grading box with a base mounted at its lower end. Multiple discharge ports are located on one side of the grading box. Multiple mounting frames are movably installed inside the grading box, with one end of each frame movably inserted into the discharge port. Rotating blocks are fixedly mounted on both sides of one end of each frame, and these rotating blocks are rotatably connected to the inner wall of the discharge port. A grading screen is detachably installed inside each mounting frame. This invention, through the synergistic effect of the separating components, achieves stable vibration and auxiliary screen cleaning of the grading screen, effectively solving problems such as easy screen clogging, unstable vibration, low grading accuracy, and inconvenient maintenance in traditional grading equipment. This ensures efficient, precise, and stable grading of graphite anode particles, providing standard-compliant graphite anode raw materials for lithium battery production and improving product consistency and battery performance.

Description

Technical Field

[0001] This invention relates to the field of lithium battery material processing technology, and in particular to a device for precise grading of graphite anode particles. Background Technology

[0002] Graphite anode material is a core component of lithium-ion batteries, and its particle size directly affects the battery's charge-discharge performance, cycle life, and safety performance. Graphite anode particles are typically obtained from natural or artificial graphite through processes such as crushing, ball milling, and grading, with a particle size range generally from 5 to 45 μm. In lithium battery production, different battery models have different requirements for the particle size of graphite anode particles. Before use, particle size analysis and tap density tests are necessary. Graphite anodes used in power batteries require strict particle size grading to ensure batch consistency.

[0003] In the production and processing of graphite anode particles, precise grading is usually required to prevent the resulting graphite particles from being of mixed sizes and failing to meet the requirements of different battery models. Without grading, these graphite materials are difficult to use directly in lithium battery production, cannot meet quality requirements, are difficult to grade and sell, and may even lead to substandard battery performance. Although various grading devices are currently available on the market, which can meet the basic needs of users to some extent, these devices still reveal some obvious shortcomings and limitations in actual operation and application. For example, when processing graphite anode particles, existing grading equipment often encounters problems because some fine particles have residual oily binders or electrostatic adsorption properties on their surface, making it difficult to separate these fine particles from the larger particles, thus affecting subsequent processing and usage. In addition, during the grading process, smaller graphite particles easily clog the mesh of the grading screen, not only reducing grading efficiency but also directly affecting the overall grading speed and final effect, causing inconvenience to actual production. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, the present invention adopts the following technical solution: A precision grading device for graphite anode particles includes a grading box with a base mounted on its lower end. Multiple discharge ports are located on one side of the grading box. Multiple mounting frames are movably mounted inside the grading box, with one end of each frame movably inserted into the discharge port. Rotating blocks are fixedly mounted on both sides of one end of each frame, and these rotating blocks are rotatably connected to the inner wall of the discharge port. A grading screen is detachably mounted inside each frame, and a connecting structure is provided between the grading screen and the mounting frame. A separation component is located at one end of each frame. A water spray structure is located on one side of the grading box, above the grading screen. A particle collection structure is located on one side of the grading box.

[0005] As a further embodiment of the present invention: guide seats are fixedly installed on both sides inside the grading box, the upper end of the guide seats is inclined, the guide seats are symmetrically distributed on both sides of the upper end of the grading screen, the upper end of the grading box is provided with a feeding port, the feeding port is located above the guide seats, and a guide plate is provided on one side of the discharge port.

[0006] As a further embodiment of the present invention: the water spraying structure includes a water storage cavity, which is located inside the guide seat away from the discharge port. A connecting water pipe is provided on one side of the water storage cavity. A water storage box is provided at the upper end of the base. One end of the connecting water pipe is connected to the water storage box. Spray nozzles are evenly installed on one side of the guide seat where the water storage cavity is located. The spray nozzles are connected to the water storage cavity. The spray nozzles are inclined above the grading screen, and the spray axis of the spray nozzles forms an angle of 30° to 60° with the plane of the grading screen.

[0007] As a further embodiment of the present invention: the separation component includes a fixing strip, which is fixedly installed on one side inside the grading box and located below the grading screen. Movable rods are movably inserted on both sides of the fixing strip. A movable seat is fixedly installed at the upper end of the movable rod. Connecting strips are fixedly installed at both ends of one side of the movable seat. A connecting seat is provided at one end of the mounting frame, and the connecting seat is movably inserted between the two connecting strips.

[0008] As a further embodiment of the present invention: a long strip-shaped connecting groove is provided on the connecting strip along its length direction; connecting blocks are fixedly installed on both sides of the connecting seat; one end of the connecting block is movably inserted into the connecting groove and forms a sliding fit structure; both sides of the mounting frame are in contact with both sides of the inner wall of the grading box; a moving strip is fixedly installed at the lower end of the moving rod; and a buffer spring connected to the moving strip and the fixed strip is sleeved on the surface of the moving rod.

[0009] As a further embodiment of the present invention: multiple crankshafts are rotatably mounted inside the grading box. The crankshafts are located below the fixed bar, and one end of the crankshaft extends to the outside of the grading box. The ends of the multiple crankshafts are synchronously connected for transmission. A driver is provided on one side of the grading box. The output end of the driver is connected to one end of one of the crankshafts for transmission. Both ends of the crankshaft are fitted with movable connecting rods that are movably connected to the moving bar. Fixed blocks are fixedly installed on both sides inside the grading box. A striking column is fixedly installed on the upper end of the fixed block. A rubber block is fixedly installed on the upper end of the striking column. The upper end of the rubber block is in contact with the lower end of the grading screen.

[0010] As a further embodiment of the present invention: the connecting structure includes a mounting groove, which is formed on both sides of the inner wall of the mounting frame. The mounting frame is U-shaped. A connecting column is fixedly installed inside the mounting groove. Both ends of the grading screen are movably inserted into the mounting groove and sleeved on the surface of the connecting column. One end of the grading screen extends to the outside of the mounting frame and is fitted with a mounting strip. One side of the mounting strip is fitted with one end of the opening of the mounting frame. Both ends of the mounting strip are provided with slots. One end of the connecting column extends into the slots and is provided with a locking hole.

[0011] As a further embodiment of the present invention: an adjustment groove is provided in the middle of the interior of the mounting strip, and through holes connected to the locking groove are provided at both ends of the adjustment groove. A double-threaded sleeve is rotatably installed inside the adjustment groove, and a threaded locking screw is movably inserted at both ends of the double-threaded sleeve. One end of the locking screw passes through the through hole and is movably inserted inside the locking hole. Limiting grooves are provided on both sides of the surface of the locking screw, and limiting blocks are provided on both sides of the surface of the locking screw. One end of the limiting block is movably inserted inside the limiting groove.

[0012] As a further embodiment of the present invention: the particle collection structure includes a collection cylinder, one end of which is provided with a water outlet pipe, one end of which is connected to the lower end of one side of the grading box, one end of which is detachably equipped with a sealing cover, one side of which is equipped with a filter screen that fits tightly against the inner wall of the collection cylinder, one side of which is provided with a discharge pipe, and the lower end of the collection cylinder is provided with a return pipe, which is connected to a water storage box.

[0013] As a further embodiment of the present invention: one end of the collecting cylinder is provided with an installation ring, the installation ring is in contact with the sealing cover plate, a plurality of installation screw sleeves are rotatably installed on one side of the installation ring, threaded installation bolts are movably inserted inside the installation screw sleeves, one end of the installation bolts is connected to the sealing cover plate, a meshing gear is provided on the outer side of the installation screw sleeves, and a meshing toothed ring is rotatably installed on one side of the installation ring, the meshing toothed ring meshing with the meshing gear.

[0014] Compared with the prior art, the present invention has at least the following advantages: In this invention, the user feeds graphite anode particles into the grading box through the feeding port, which is located above the guide seat. This prevents the particles from splashing and scattering onto the inner wall of the grading box, allowing them to slide directly onto the middle of the grading screen along the inclined upper surface of the guide seat. This avoids particles landing on the edges of the grading screen and failing to complete effective grading, ensuring that all graphite anode particles to be graded land on the grading screen surface for grading processing. This improves the uniformity and final grading accuracy, and also prevents impact damage to the grading screen, extending its overall service life. After the graphite anode particles land on the grading screen surface, they are graded. Graphite anode particles of different sizes pass sequentially through the corresponding mesh sizes of the grading screen to complete the stratification. Finally, graphite anode particles that meet the particle size requirements are discharged from the outlet along the inclined grading screen and collected by the guide plate. The entire grading process is smooth and continuous, without particle blockage or accumulation.

[0015] In this invention, the synergistic effect of the separation components enables stable vibration and auxiliary cleaning of the grading screen, effectively solving problems such as easy clogging of the screen, unstable vibration, low grading accuracy, and inconvenient maintenance in traditional grading equipment. This ensures efficient, accurate, and stable grading of graphite anode particles, providing standard-compliant graphite anode raw materials for lithium battery production and improving product consistency and battery performance.

[0016] In this invention, the nozzle is inclined above the grading screen, and the spray axis of the nozzle forms an angle of 30° to 60° with the plane of the grading screen. This angle allows the water jet from the nozzle to form a directional oblique impact force, accurately and completely covering the graphite negative electrode particles on the surface of the grading screen. This avoids the splashing of graphite particles caused by vertical water jetting, and ensures that the water flow fully penetrates into the bonding gaps between the graphite negative electrode particles and sticky particles (such as oily binder residue, electrostatically adsorbed fine powder, agglomerates, etc.). Through the impact force and wetting effect of the water flow, It powerfully peels off and washes away the sticky substances adhering to the surface of graphite negative electrode particles, forcibly breaking the adsorption force between the sticky particles and the graphite negative electrode particles, achieving complete separation of the sticky substances from the graphite negative electrode particles without any residue. At the same time, the separated sticky substances can be promptly washed down to the bottom of the grading screen for discharge, effectively preventing the sticky substances from adhering to the graphite particles again and avoiding the sticky substances from clumping and clogging the grading screen mesh. This not only ensures the separation effect of sticky substances from graphite negative electrode particles, but also helps to improve the grading accuracy, achieving the dual effects of efficient dust reduction and cleaning.

[0017] In this invention, the connection structure, through the cooperation of double-threaded sleeves and locking screws, enables the rapid locking and unlocking of the grading screen and the mounting frame. The operator only needs to rotate the double-threaded sleeve to make the locking screws at both ends retract or extend synchronously, thereby separating or engaging the locking screws with the locking holes. This eliminates the need for complex tools, greatly simplifying the installation and disassembly process of the grading screen. At the same time, the grading screen is initially positioned by using connecting posts at both ends, eliminating the need for repeated adjustments to the position of the grading screen during installation. This allows for quick and accurate installation of the grading screen, effectively improving installation efficiency. It is especially suitable for scenarios where the grading screen needs to be disassembled, cleaned, and replaced regularly, reducing the labor intensity of the operators.

[0018] In this invention, the structure is specifically designed to collect solid particles, impurities, and other materials separated during the grading process, while simultaneously enabling water resource recycling and ensuring the continuity and cleanliness of the grading operation. The core component of the particle collection structure is the collection cylinder, made of corrosion-resistant, high-strength engineering plastics or stainless steel. Its internal hollow cylindrical structure can accommodate a certain amount of particulate material and mixed water, preventing clogging due to material accumulation. The filter screen is made of high-density metal or wear-resistant nylon mesh, with the mesh pore size adapted to the size of the graded particles. This allows for precise interception of solid particles in the mixed water, preventing particles from being lost with the water, while ensuring that water can pass smoothly through the filter screen, achieving solid-liquid separation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the side structure of the overall device.

[0020] Figure 2 This is a schematic diagram of the structure on the other side of the overall device.

[0021] Figure 3 This is a schematic diagram of the side cross-sectional structure of the overall device.

[0022] Figure 4 This is a schematic diagram of the installation location of the separate components in the overall device.

[0023] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0024] Figure 6 A top-view structural diagram of the installation location of the separate components of the overall device.

[0025] Figure 7 This is a partial cross-sectional view of the grading screen installation area in the overall device.

[0026] Figure 8 for Figure 7 Enlarged view of point B in the middle.

[0027] Figure 9 This is a schematic diagram of a half-section of the collection cylinder in the overall device.

[0028] Figure 10 for Figure 9 Enlarged view of point C in the middle.

[0029] In the diagram, 100 is the grading box; 110 is the feeding port; 120 is the discharge port; 121 is the guide plate; 130 is the base; 140 is the guide seat; 141 is the water storage chamber; 142 is the nozzle; 150 is the fixing strip; 161 is the fixing block; 162 is the striking column; 163 is the rubber block; 200 is the mounting frame; 201 is the connecting seat; 202 is the connecting block; 203 is the mounting groove; 204 is the rotating block; 205 is the connecting column; 210 is the grading screen; 220 is the movable seat; 221 is the connecting strip; 222 is the connecting groove; 223 is the movable strip; 224 is the movable rod; 225 is the buffer spring; 2 30. Mounting strip; 231. Adjusting groove; 232. Double threaded sleeve; 233. Locking screw; 234. Through hole; 235. Limiting block; 236. Limiting groove; 237. Locking groove; 238. Locking hole; 300. Collection cylinder; 301. Water outlet pipe; 302. Return pipe; 310. Discharge pipe; 320. Sealing cover; 330. Mounting ring; 331. Mounting sleeve; 332. Mounting bolt; 333. Engaging gear; 334. Engaging toothed ring; 340. Filter screen; 400. Water storage box; 410. Connecting water pipe; 500. Driver; 510. Crankshaft; 511. Connecting rod. Detailed Implementation

[0030] The present invention will now be described in further detail.

[0031] See Figures 1 to 10 , Example 1: A precision grading device for graphite negative electrode particles includes a grading box 100, a base 130 mounted on the lower end of the grading box 100, multiple discharge ports 120 on one side of the grading box 100, and multiple mounting frames 200 movably mounted inside the grading box 100. One end of each mounting frame 200 is movably inserted into the discharge port 120. Rotating blocks 204 are fixedly mounted on both sides of one end of each mounting frame 200, and the rotating blocks 204 are rotatably connected to the inner wall of the discharge port 120. The mounting frame 200 has a detachable grading screen 210 installed inside. A separation component is provided at one end of the mounting frame 200. Guide seats 140 are fixedly installed on both sides inside the grading box 100. The upper end of the guide seats 140 is inclined. The guide seats 140 are symmetrically distributed on both sides of the upper end of the grading screen 210. A feeding port 110 is provided at the upper end of the grading box 100. The feeding port 110 is located above the guide seats 140. A guide plate 121 is provided on one side of the discharge port 120. Specifically, the user feeds the graphite anode particles into the classifier 100 through the feeding port 110. The feeding port 110 is located above the guide seat 140, which prevents the fed graphite anode particles from splashing and falling onto the inner wall of the classifier 100. The graphite particles slide directly down the inclined upper surface of the guide seat 140 to the middle of the classifier screen 210, avoiding particles falling to the edge of the classifier screen 210 and failing to complete effective classification. This ensures that all graphite anode particles to be classified can fall onto the surface of the classifier screen 210 for classification, improving the uniformity and final classification accuracy. It also prevents impact from damaging the classifier screen 210 and extends the overall service life of the classifier screen 210. When the graphite anode particles fall onto the surface of the grading screen 210, they are graded. Graphite anode particles of different sizes pass through the grading screen 210 with corresponding mesh sizes in sequence to complete the grading. Finally, the graphite anode particles that meet the particle size requirements are discharged from the discharge port 120 along the inclined grading screen 210 and are collected by the guide plate 121. The entire grading process is smooth and continuous, and there will be no particle blockage or accumulation.

[0032] Example 2: Precision grading device for graphite negative electrode particles. The separation component includes a fixing strip 150, which is fixedly installed on one side inside the grading box 100. The fixing strip 150 is located below the grading screen 210. Movable rods 224 are movably inserted on both sides of the fixing strip 150. A movable seat 220 is fixedly installed at the upper end of the movable rod 224. Connecting strips 221 are fixedly installed at both ends of one side of the movable seat 220. A connecting seat 201 is provided at one end of the mounting frame 200. The connecting seat 201 is movably inserted between the two connecting strips 221. A long strip-shaped connecting groove 222 is opened on the connecting strip 221 along its length direction. Connecting blocks 202 are fixedly installed on both sides of the connecting seat 201. One end of the connecting block 202 is movably inserted into the connecting groove 222 and forms a sliding fit structure. The two sides of the mounting frame 200 are in contact with the two sides of the inner wall of the grading box 100. A movable strip 223 is fixedly installed at the lower end of the movable rod 224. A buffer spring 225, connected to the moving bar 223 and the fixed bar 150, is fitted onto the surface of the moving rod 224. The buffer spring 225 is always in a pre-compressed state, used to buffer and dampen the up-and-down reciprocating motion of the moving rod 224, reducing the impact force generated during vibration, reducing wear on various components, and assisting the moving rod 224 in resetting, ensuring the continuity and stability of the vibration action. Multiple crankshafts 510 are rotatably mounted inside the classifier 100. Both ends of the crankshafts 510 are rotatably connected to the inner wall of the classifier 100 via bearings, ensuring smooth and unobstructed rotation. The crankshafts 510 are located below the fixed bar 150, with one end extending to the outside of the classifier 100. Multiple crankshafts 510 are connected synchronously at one end, and the ends of multiple crankshafts 510 extending to the outside of the grading box 100 are connected by chains, gear sets or synchronous belts to achieve synchronous rotation of multiple crankshafts 510, ensuring that the rotation angle and speed of each crankshaft 510 are completely consistent, thereby driving the separation component to move synchronously as a whole, and avoiding uneven local force on the grading screen 210.

[0033] A driver 500 is provided on one side of the grading box 100. The output end of the driver 500 is connected to one end of one of the crankshafts 510. The driver 500 uses power components such as motors and hydraulic motors. The output end of the driver 500 is connected to one end of one of the crankshafts 510 through a coupling to provide stable power for the rotation of the crankshaft 510. By adjusting the speed of the driver 500, the rotation speed of the crankshaft 510 can be flexibly controlled, thereby adjusting the vibration frequency of the grading screen 210 to adapt to the grading requirements of graphite negative electrode particles with different particle sizes and characteristics. Both ends of the crankshaft 510 are fitted with movable connecting rods 511 that are movably connected to the moving strip 223. Fixing blocks 161 are fixedly installed on both sides inside the grading box 100. A striking column 162 is fixedly installed on the upper end of the fixing block 161. A rubber block 163 is fixedly installed on the upper end of the striking column 162. The upper end of the rubber block 163 is in contact with the lower end of the grading screen 210. Specifically, during the grading process, the driver 500 drives the crankshaft 510 to rotate. The crankshafts 510 rotate synchronously through a transmission structure. When the crankshaft 510 rotates, it drives the moving bar 223 to move up and down repeatedly through the movable connecting rod 511. This, in turn, drives the moving rod 224 and the moving seat 220 to move vertically up and down along the fixed bar 150. During the lifting and lowering process, the moving seat 220 drives the connecting seat 201 and one end of the mounting frame 200 to move up and down repeatedly through the connecting bar 221. This causes one end of the mounting frame 200 to be repeatedly lifted and lowered, causing the grading screen 210 to swing back and forth slightly along the axis of the rotating block 204. This causes the graphite negative electrode particles on the grading screen 210 to continuously loosen and displace, preventing graphite particles from getting stuck in the mesh of the grading screen 210 and causing blockage, thus ensuring that the grading process continues smoothly. When the grading screen 210 moves downward, the rubber block 163 at the top of the striking column 162 will contact and strike the lower end of the grading screen 210, further vibrating the grading screen 210, assisting the particles stuck in the mesh to detach, and the swing of the grading screen 210 further improves the grading efficiency. The buffer spring 225 can buffer the impact force during the movement, avoid rigid collisions that could damage the parts, and further extend the service life of the entire equipment. Through the synergistic effect of the separation components, stable vibration and auxiliary cleaning of the grading screen 210 can be achieved, effectively solving problems such as easy clogging of screens, unstable vibration, low grading accuracy, and inconvenient maintenance in traditional grading equipment. This ensures efficient, accurate, and stable grading of graphite anode particles, providing standard-compliant graphite anode raw materials for lithium battery production and improving product consistency and battery performance.

[0034] Example 3: Precision grading device for graphite negative electrode particles. A water spraying structure is provided on one side of the grading box 100. The water spraying structure is located on the side above the grading screen 210. The water spraying structure includes a water storage chamber 141. The water storage chamber 141 is opened inside the guide seat 140 away from the discharge port 120. A connecting water pipe 410 is provided on one side of the water storage chamber 141. A water storage box 400 is provided at the upper end of the base 130. One end of the connecting water pipe 410 is connected to the water storage box 400. Spray nozzles 142 are evenly installed on one side of the guide seat 140 where the water storage chamber 141 is opened. The spray nozzles 142 are connected to the water storage chamber 141. The spray nozzles 142 are inclined above the grading screen 210, and the spray axis of the spray nozzles 142 forms an angle of 30° to 60° with the plane of the grading screen 210. Specifically, the nozzle 142 is inclined above the grading screen 210, and the spray axis of the nozzle 142 forms an angle of 30° to 60° with the plane of the grading screen 210. This angle allows the water jet from the nozzle 142 to form a directional oblique impact force, accurately and completely covering the graphite negative electrode particles on the surface of the grading screen 210. This avoids the splashing of graphite particles caused by vertical water jetting, and ensures that the water jet fully penetrates into the bonding gap between the graphite negative electrode particles and the sticky substances (such as oily binder residue, electrostatically adsorbed fine powder, agglomerates, etc.). Through the impact force of the water jet and the... The wetting action powerfully peels off and washes away the sticky substances adhering to the surface of the graphite negative electrode particles, forcibly breaking the adsorption force between the sticky substances and the graphite negative electrode particles, achieving complete separation of the sticky substances from the graphite negative electrode particles without any residue. At the same time, the separated sticky substances can be promptly washed down to the bottom of the grading screen 210 for discharge, effectively preventing the sticky substances from adhering to the graphite particles again and avoiding the sticky substances from clumping and clogging the mesh of the grading screen 210. This not only ensures the separation effect of the sticky substances from the graphite negative electrode particles, but also helps to improve the grading accuracy, while achieving the dual effects of efficient dust reduction and cleaning. The nozzle 142 and the guide seat 140 are connected by a threaded seal, which facilitates the disassembly, maintenance and replacement of a single nozzle 142 without disassembling the entire water spray structure, reducing maintenance workload and costs. The water storage box 400 is set on the upper end of the base 130, which makes it easy for operators to add water and repair the booster pump, improving the ease of operation of the equipment. At the same time, the water storage box 400 can realize the centralized storage and recycling of water, further saving water resources and reducing production energy consumption.

[0035] Example 4: A precise grading device for graphite negative electrode particles. A connecting structure is provided between the grading screen 210 and the mounting frame 200. The connecting structure includes a mounting groove 203, which is formed on both sides of the inner wall of the mounting frame 200. The mounting frame 200 is U-shaped. A connecting column 205 is fixedly installed inside the mounting groove 203. Both ends of the grading screen 210 are movably inserted into the mounting groove 203 and fitted onto the surface of the connecting column 205. One end of the grading screen 210 extends to the outside of the mounting frame 200 and is fitted with a mounting strip 230. One side of the mounting strip 230 is abutted against one end of the opening of the mounting frame 200. Both ends of the mounting strip 230 are provided with a slot 237. One end of the connector 205 extends into the interior of the slot 237 and has a locking hole 238. An adjustment groove 231 is provided in the middle of the interior of the mounting strip 230. Both ends of the adjustment groove 231 have through holes 234 that connect to the slot 237. A double-threaded sleeve 232 is rotatably installed inside the adjustment groove 231. Both ends of the double-threaded sleeve 232 are movably inserted with threaded locking screws 233. One end of the locking screw 233 passes through the through hole 234 and is movably inserted into the interior of the locking hole 238. Limiting grooves 236 are provided on both sides of the surface of the locking screw 233. Limiting blocks 235 are provided on both sides of the surface of the locking screw 233. One end of the limiting block 235 is movably inserted into the interior of the limiting groove 236. Specifically, a double-threaded sleeve 232 is rotatably mounted inside the adjusting groove 231 via a bearing. The two ends of the double-threaded sleeve 232 have threads with opposite directions of rotation. Both ends of the double-threaded sleeve 232 are movably inserted with locking screws 233 that are compatible with the threads. The end of the locking screw 233 away from the double-threaded sleeve 232 passes through a through hole 234 and movably inserts into a locking hole 238, thereby locking the mounting strip 230 to the connecting post 205. To prevent the locking screw 233 from rotating during movement, ensuring… For locking effect, limit grooves 236 are provided on both sides of the surface of the locking screw 233. The limit grooves 236 extend along the length direction of the locking screw 233. At the same time, limit blocks 235 are fixedly installed on both sides of the inner wall of the mounting strip 230 corresponding to the through hole 234. One end of the limit block 235 is movably inserted into the inside of the limit groove 236. Through the cooperation of the limit block 235 and the limit groove 236, the locking screw 233 is circumferentially limited, ensuring that the locking screw 233 can only move axially and cannot rotate. This connection structure, through the cooperation of the double-threaded sleeve 232 and the locking screw 233, enables the quick locking and unlocking of the grading screen 210 and the mounting frame 200. The operator only needs to rotate the double-threaded sleeve 232 to make the locking screws 233 at both ends retract or extend synchronously, thereby realizing the separation or engagement of the locking screws 233 and the locking holes 238. Without the need for complicated tools, the installation and disassembly process of the grading screen 210 is greatly simplified. At the same time, the grading screen 210 is initially positioned by using connecting posts 205 at both ends. During installation, there is no need to repeatedly adjust the position of the grading screen 210, which can quickly and accurately install the grading screen 210 into place, effectively improving installation efficiency. It is especially suitable for scenarios where the grading screen 210 needs to be disassembled, cleaned and replaced regularly, reducing the labor intensity of the operator.

[0036] Example 5: Precision grading device for graphite negative electrode particles. A particle collection structure is provided on one side of the grading box 100. The particle collection structure includes a collection cylinder 300. A water outlet pipe 301 is provided at one end of the collection cylinder 300. One end of the water outlet pipe 301 is connected to the lower end of one side of the grading box 100. A sealing cover plate 320 is detachably installed at one end of the collection cylinder 300. A filter screen cover 340 that fits tightly against the inner wall of the collection cylinder 300 is installed on one side of the sealing cover plate 320. A discharge pipe 310 is provided on one side of the sealing cover plate 320. A return pipe 302 is provided at the lower end of the collection cylinder 300. The return pipe 302 is connected to a water storage box 400. Specifically, this structure is designed to collect solid particles and impurities separated during the grading process, while simultaneously enabling water recycling and ensuring the continuity and cleanliness of the grading operation. The core component of the particle collection structure is the collection cylinder 300, made of corrosion-resistant, high-strength engineering plastics or stainless steel. Its internal hollow cylindrical structure can hold a certain amount of particulate material and mixed water, preventing clogging due to material accumulation. The filter screen 340 is made of high-density metal or wear-resistant nylon mesh, with pore sizes adapted to the size of the graded particles. This allows for precise interception of solid particles in the mixed water, preventing particles from being lost with the water, while ensuring that water can pass smoothly through the filter screen, achieving solid-liquid separation.

[0037] The discharge pipe 310 is sealed to the sealing cover plate 320. One end of the pipe extends into the inside of the filter screen 340 and the other end extends into the outside of the collection cylinder 300. A control valve can be selectively installed on the discharge pipe 310 to control the timing and speed of the discharge of particulate material. When the particulate material in the collection cylinder 300 accumulates to a certain amount, the control valve can be opened to discharge the intercepted particles in a concentrated manner. The operation is convenient and efficient. The filtered clean water in the collection cylinder 300 flows back to the water storage box 400 through the return pipe 302 and can be reused for rinsing, cooling and other processes in the grading operation. There is no need to add a large amount of fresh water, which significantly reduces water consumption. It is especially suitable for water-scarce scenarios and can save a lot of production water costs in the long run. The intercepted solid particles are stored in the collection cylinder 300 and can be discharged centrally through the discharge pipe 310, which prevents the particles from scattering around the equipment or into the environment. This keeps the work site clean and facilitates the recycling and reuse of the collected particles (such as secondary classification, crushing and reprocessing) or centralized treatment, reducing material waste and environmental pollution.

[0038] Example 6: A precise grading device for graphite negative electrode particles. One end of the collection cylinder 300 is provided with an installation ring 330, which fits against the sealing cover plate 320. Multiple installation sleeves 331 are rotatably installed on one side of the installation ring 330. Threaded installation bolts 332 are movably inserted inside the installation sleeves 331. One end of the installation bolts 332 is connected to the sealing cover plate 320. Engaging gears 333 are provided on the outer side of the installation sleeves 331. Engaging toothed rings 334 are rotatably installed on one side of the installation ring 330, and the engagement toothed rings 334 mesh with the engagement gears 333. Specifically, the mounting ring 330 has a ring structure, and its end face is precision polished to ensure that the contact surface with the sealing cover plate 320 is flat and smooth. A high-temperature resistant and corrosion-resistant sealing gasket can also be added to the contact area to further improve the sealing effect and prevent the mixed water or particles in the collection cylinder 300 from leaking out from the contact gap. When installing the sealing cover 320, the operator only needs to align the sealing cover 320 with the mounting ring 330, so that the mounting bolts 332 pass through the mounting holes of the sealing cover 320 and are inserted into the corresponding mounting sleeves 331. Then, rotate the meshing toothed ring 334. Through the meshing transmission between the meshing toothed ring 334 and the meshing gear 333, all the mounting sleeves 331 will rotate synchronously, thereby tightening multiple mounting bolts 332 simultaneously and quickly completing the installation and fixing of the sealing cover 320. When disassembling, rotating the meshing toothed ring 334 in the opposite direction will drive all the mounting sleeves 331 to rotate synchronously in the opposite direction, loosening multiple mounting bolts 332 simultaneously. There is no need to operate the mounting sleeves 331 one by one, which greatly improves the operation efficiency.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A graphite negative electrode particle precision grading device, comprising a grading box (100), the lower end of the grading box (100) is provided with a base (130), characterized in that: The grading box (100) has multiple discharge ports (120) on one side. Multiple mounting frames (200) are movably installed inside the grading box (100). One end of the mounting frame (200) is movably inserted into the discharge port (120). Rotating blocks (204) are fixedly installed on both sides of one end of the mounting frame (200). The rotating blocks (204) are rotatably connected to the inner wall of the discharge port (120). A grading screen (210) is detachably installed inside the mounting frame (200). A connecting structure is provided between the grading screen (210) and the mounting frame (200). A separation component is provided at one end of the mounting frame (200). A water spray structure is provided on one side inside the grading box (100). The water spray structure is located on the side above the grading screen (210). A particle collection structure is provided on one side of the grading box (100).

2. The graphite negative electrode particle precision fractionating device according to claim 1, characterized by: The grading box (100) has guide seats (140) fixedly installed on both sides inside. The upper end of the guide seat (140) is inclined. The guide seats (140) are symmetrically distributed on both sides of the upper end of the grading screen (210). The upper end of the grading box (100) is provided with a feeding port (110). The feeding port (110) is located above the guide seat (140). A guide plate (121) is provided on one side of the discharge port (120).

3. The graphite negative electrode particle precision fractionating device according to claim 2, characterized by: The water spray structure includes a water storage chamber (141), which is located inside a guide seat (140) away from the discharge port (120). A connecting water pipe (410) is provided on one side of the water storage chamber (141). A water storage box (400) is provided at the upper end of the base (130). One end of the connecting water pipe (410) is connected to the water storage box (400). Spray nozzles (142) are evenly installed on one side of the guide seat (140) where the water storage chamber (141) is located. The spray nozzles (142) are connected to the water storage chamber (141). The spray nozzles (142) are inclined above the grading screen (210), and the spray axis of the spray nozzles (142) forms an angle of 30° to 60° with the plane of the grading screen (210).

4. The graphite negative electrode particle precision fractionating device of claim 1, wherein: The separation component includes a fixing strip (150), which is fixedly installed on one side inside the grading box (100). The fixing strip (150) is located below the grading screen (210). Movable rods (224) are movably inserted on both sides of the fixing strip (150). A movable seat (220) is fixedly installed at the upper end of the movable rod (224). Connecting strips (221) are fixedly installed at both ends of one side of the movable seat (220). A connecting seat (201) is provided at one end of the mounting frame (200). The connecting seat (201) is movably inserted between the two connecting strips (221).

5. The graphite negative electrode particle precision fractionating device according to claim 4, characterized by: The connecting strip (221) has a long strip-shaped connecting groove (222) along its length direction. Connecting blocks (202) are fixedly installed on both sides of the connecting seat (201). One end of the connecting block (202) is movably inserted into the connecting groove (222) and forms a sliding fit structure. The two sides of the mounting frame (200) are in contact with the two sides of the inner wall of the grading box (100). The lower end of the moving rod (224) is fixedly installed with a moving strip (223). The surface of the moving rod (224) is fitted with a buffer spring (225) that is connected to the moving strip (223) and the fixed strip (150).

6. The graphite negative electrode particle precision fractionating device according to claim 5, characterized by: Multiple crankshafts (510) are rotatably mounted inside the grading box (100). The crankshafts (510) are located below the fixing bar (150). One end of the crankshafts (510) extends to the outside of the grading box (100). The ends of the multiple crankshafts (510) are synchronously connected for transmission. A driver (500) is provided on one side of the grading box (100). The output end of the driver (500) is connected to one end of one of the crankshafts (510). Both ends of the crankshafts (510) are fitted with movable connecting rods (511) that are movably connected to the moving bar (223). Fixing blocks (161) are fixedly installed on both sides inside the grading box (100). A striking column (162) is fixedly installed on the upper end of the fixing block (161). A rubber block (163) is fixedly installed on the upper end of the striking column (162). The upper end of the rubber block (163) is in contact with the lower end of the grading screen (210).

7. The graphite negative electrode particle precision fractionating device of claim 1, wherein: The connecting structure includes a mounting groove (203), which is formed on both sides of the inner wall of the mounting frame (200). The mounting frame (200) is U-shaped. A connecting column (205) is fixedly installed inside the mounting groove (203). The two ends of the grading screen (210) are respectively movably inserted into the inside of the mounting groove (203) and sleeved on the surface of the connecting column (205). One end of the grading screen (210) extends to the outside of the mounting frame (200) and is fitted with a mounting strip (230). One side of the mounting strip (230) is in contact with one end of the opening of the mounting frame (200). Both ends of the mounting strip (230) are provided with slots (237). One end of the connecting column (205) extends into the inside of the slots (237) and is provided with a slot hole (238).

8. The graphite negative electrode particle precision fractionating device according to claim 7, characterized by: An adjustment groove (231) is provided in the middle of the installation strip (230). Both ends of the adjustment groove (231) are provided with through holes (234) that are connected to the slot (237). A double threaded sleeve (232) is rotatably installed inside the adjustment groove (231). Both ends of the double threaded sleeve (232) are movably inserted with threaded locking screws (233). One end of the locking screw (233) passes through the through hole (234) and is movably inserted into the slot (238). Limiting grooves (236) are provided on both sides of the surface of the locking screw (233). Limiting blocks (235) are provided on both sides of the surface of the locking screw (233). One end of the limiting block (235) is movably inserted into the limiting groove (236).

9. The graphite negative electrode particle precision fractionating device of claim 2, wherein: The particle collection structure includes a collection cylinder (300), one end of which is provided with a water outlet pipe (301), one end of which is connected to the lower end of the side of the grading box (100), one end of which is detachably installed with a sealing cover plate (320), one side of which is installed with a filter screen cover (340) that fits tightly against the inner wall of the collection cylinder (300), one side of which is provided with a discharge pipe (310), and the lower end of the collection cylinder (300) is provided with a return pipe (302), which is connected to a water storage box (400).

10. The graphite negative electrode particle precision fractionating device of claim 9, wherein: One end of the collecting cylinder (300) is provided with an installation ring (330), which fits against the sealing cover plate (320). Multiple installation sleeves (331) are rotatably installed on one side of the installation ring (330). Threaded installation bolts (332) are movably inserted inside the installation sleeves (331). One end of the installation bolts (332) is connected to the sealing cover plate (320). Engaging gears (333) are provided on the outer side of the installation sleeves (331). Engaging toothed rings (334) are rotatably installed on one side of the installation ring (330), and the engagement toothed rings (334) mesh with the engagement gears (333).

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