Particle size adjustable lithium iron phosphate particle surface coating modification production device

Abstract

The invention belongs to the technical field of material crushing, and particularly relates to a particle size adjustable lithium iron phosphate particle surface coating modification production device which comprises a base, an outer cylinder, a pressing cylinder and a grinding groove, and a main shaft is sequentially provided with a scattering wheel, a wind wheel and a plurality of telescopically adjustable depolymerization structures from bottom to top. The wind wheel can suck raw materials in the feeding cavity through the air inlet and move the raw materials to the position between the depolymerization structure and the grinding groove under the centrifugal effect, raw material particles in a spiral rising state are smashed under the mutual cooperation of the depolymerization structure and the grinding groove, and when the particle size of the smashed particles needs to be increased or decreased, the raw materials are smashed. The airflow speed and the centrifugal force are changed by controlling the shrinkage or extension of the crushing blades, and the collision frequency of raw material particles in the grinding groove is controlled by changing the distance between the crushing blades and the grinding groove, so that the particle size of the raw material particles is changed, the rotating speed of the main shaft does not need to be adjusted, and the wind wheel can uniformly feed raw materials at the original speed.

Description

Technical Field

[0001] This invention belongs to the field of material crushing technology, and in particular relates to a production device for surface coating modification of lithium iron phosphate particles with adjustable particle size. Background Technology

[0002] Lithium iron phosphate (LFP) is a widely used cathode material in the current lithium-ion battery field. In the LFP production process, particle size distribution is controlled by adjusting the proportion of particles of different sizes to increase the bulk density of the raw material, thereby improving battery performance and compaction density. In existing honeycomb mills, the main shaft drives the impeller and deagglomeration wheel to rotate. The rotating impeller generates negative pressure inside the mill, transporting the raw material to be pulverized between the deagglomeration wheel and the grinding groove. The deagglomeration wheel and grinding groove work together to pulverize the raw material particles. To obtain raw material particles of different sizes, reducing the main shaft speed weakens the impact, shearing, and friction effects of the deagglomeration wheel and grinding groove on the material, reducing the collision frequency between particles and thus increasing the particle size. Conversely, increasing the main shaft speed increases the impact, shearing, and friction effects of the deagglomeration wheel and grinding groove on the material, increasing the collision frequency between particles and thus reducing the particle size. However, since the impeller and deagglomeration wheel are fixed to the main shaft, their rotational speeds... Similarly, when increasing particle size to meet production needs, reducing the spindle speed weakens the impact, shearing, and friction of the deagglomerating wheel and grinding trough on the material. However, the impeller speed also decreases, slowing down the material conveying speed. This causes material to accumulate in the feed pipe and feed chamber, where it easily agglomerates into large clumps. These clumps, once in the deagglomeration chamber, are difficult to break down fully by the deagglomerating wheel, ultimately resulting in a large number of particles that do not meet the particle size requirements in the product. Conversely, when decreasing particle size to meet production needs, increasing the spindle speed increases the impact, shearing, and friction of the deagglomerating wheel and grinding trough on the material. However, the impeller speed also increases simultaneously, raising the airflow velocity. The material is fed into the deagglomeration chamber too quickly, leaving insufficient time for the material to undergo adequate impact, shearing, and friction between the deagglomerating wheel and grinding trough, resulting in incomplete crushing and similarly producing a large number of particles that do not meet the particle size standards. Summary of the Invention

[0003] (a) Technical problems to be solved This invention provides a production apparatus for surface coating modification of lithium iron phosphate particles with adjustable particle size to solve the following problems.

[0004] 1. Although reducing the spindle speed can increase the particle size of the crushed particles, the speed of the impeller will also decrease, and the material conveying speed will slow down, causing the material to accumulate and agglomerate into large particle clusters in the feed pipe and feed chamber. After these particle clusters enter the deagglomeration chamber, they are difficult to be fully crushed by the deagglomeration wheel, ultimately resulting in a large number of particles in the product that do not meet the particle size requirements. 2. While increasing the spindle speed can reduce the particle size of the crushed particles, the impeller speed will also increase simultaneously, increasing the airflow velocity. The material is fed into the deagglomeration chamber too quickly, resulting in insufficient time for the material to undergo sufficient impact, shearing, and friction between the deagglomeration wheel and the grinding groove. This leads to incomplete crushing and produces a large number of particles that do not meet the particle size standards.

[0005] (II) Technical Content To achieve the above objectives, the present invention provides the following technical solution: A production device for surface coating modification of lithium iron phosphate particles with adjustable particle size includes a base and an outer cylinder fixed to the base. The base is provided with a feeding chamber and a main shaft is installed on the base. The main shaft rotates through the feeding chamber and extends upward. From bottom to top, the main shaft is equipped with a dispersing wheel, a blower and multiple retractable and adjustable deagglomeration structures. The depolymerization structure includes a bottom wheel, an adjusting wheel, and multiple crushing blades located between the bottom wheel and the adjusting wheel. The adjusting wheel has a groove and multiple composite limiting plates are installed on the adjusting wheel. Umbrella-type push-pull plates are slidably connected to the composite limiting plates. An adjusting toothed disc and a main toothed disc meshing with the adjusting toothed disc are rotatably connected on the groove. The top of the adjusting toothed disc is provided with a guide groove corresponding to the umbrella-shaped push-pull plate. One end of the umbrella-shaped push-pull plate is fixedly connected to a slider, and the slider is slidably connected to the corresponding guide groove. The umbrella-shaped push-pull plate is provided with an arc groove. The top of the crushing blade is provided with a sliding rod, and the sliding rod extends into the corresponding arc groove. The outer cylinder is provided with grinding grooves corresponding to the depolymerization structure; Two adjacent main gear discs are connected by a second synchronous pressure rod; The outer cylinder is equipped with a pressure cylinder at the top, and the top of the pressure cylinder is open.

[0006] Furthermore, a shaft platform is fixedly installed inside the base, the main shaft is rotatably inserted into the shaft platform, and the bottom of the main shaft extends to the bottom of the shaft platform. A first motor is installed on the top of the base, the output shaft of the first motor extends into the base, and the main shaft and the output shaft of the first motor are connected by a synchronous belt drive. The dispersing wheel is fixedly sleeved on the main shaft, which has multiple snap-fit ​​protrusions in a circular shape. The impeller and the deagglomeration structure are both inserted into the main shaft with snap-fit ​​protrusions. The dispersing wheel is located in the feed chamber, and the impeller is located in the outer cylinder; A partition is detachably installed on the top of the feeding chamber, and the partition has an air inlet. The feeding chamber is connected to the inner cavity of the outer cylinder through the air inlet.

[0007] Furthermore, the bottom of the bottom wheel is fixed with a docking plug in a circular shape, and the top of the impeller and the adjusting wheel are provided with docking slots that correspond one-to-one with the docking plugs. The adjusting wheel in one of the depolymerization structures is connected to the docking plug on the bottom wheel in the other depolymerization structure above it through the docking slot. The wind turbine is connected to the bottom wheel disk in the depolymerization structure above it via a docking slot.

[0008] Furthermore, the bottom wheel and the adjusting wheel are both provided with several sliding grooves in a circular shape at their close ends, and the upper and lower ends of the crushing blade are slidably connected to the corresponding sliding grooves respectively. The top of the bottom wheel is also provided with a spindle limiting sleeve, and the adjusting wheel is provided with a docking boss. The top of the spindle limiting sleeve is inserted into the docking boss. The adjusting gear is rotated and sleeved on the docking boss. A limiting pressure plate is detachably installed on the top of the docking boss. The bottom of the limiting pressure plate slides in contact with the top of the adjusting gear. The spindle limiting sleeve is inserted into the spindle with a snap-fit ​​protrusion. The top of the bottom wheel is provided with multiple inner docking cylinders, and the top of the adjusting wheel is provided with outer docking cylinders corresponding to the inner docking cylinders. The inner docking cylinders are inserted into the corresponding outer docking cylinders and fixed by bolts and nuts.

[0009] Furthermore, a U-shaped partition is provided between two adjacent sliding grooves on the bottom wheel disk, and the crushing blade slides in contact with the partitions on both sides. The guide groove is arc-shaped; The composite limiting plate is circumferentially mounted on the adjusting wheel. The composite limiting plate includes two bottom support bars and an inverted U-shaped limiting slider. One end of the two bottom support bars is integrally fixed to both ends of the limiting slider, and the other end is detachably fixed to the adjusting gear plate. The umbrella-shaped push-pull plate is slidably inserted into the limiting slider, and the bottom of the limiting slider slides in contact with the top of the two bottom support bars. The adjusting wheel has several guide grooves that correspond one-to-one with the sliding rods. The sliding rods pass through the corresponding guide grooves and extend into the corresponding arc grooves.

[0010] Furthermore, the umbrella-shaped push-pull plate is symmetrically provided with through slots, and the two bottom support bars on the same composite limiting plate are threaded with limiting rods. The limiting rods extend out of the corresponding through slots, and the top of the limiting rods is integrally provided with a locking block. The top of the umbrella-shaped push-pull plate slides in contact with the bottom of the locking block. The two adjacent composite limiting plates are staggered vertically, and the multiple composite limiting plates on the lower plane are at the same horizontal height, while the multiple composite limiting plates on the upper plane are at the same horizontal height.

[0011] Furthermore, a keyway is provided on the main gear plate, and a circular through hole is provided on the bottom of the keyway and on the corresponding bottom wheel plate and adjusting wheel plate, and the circular through hole is connected to the keyway. Among them, the keyway on the bottommost main gear plate is connected to the first synchronous pressure rod. The first synchronous pressure rod is divided into the first keyway pressure block and the first round rod from top to bottom. The first round rod is slidably inserted into the corresponding round through hole, and the first keyway pressure block is inserted into the corresponding keyway. The top of the first keyway pressure block is provided with the first engagement groove. The remaining main gear plates are each connected to a second synchronous pressure rod. The second synchronous pressure rod is divided into a second keyway pressure block, a second round rod and a limiting plug from top to bottom. The top of the second keyway pressure block is provided with a second engagement groove. The limiting plug is polygonal and is adapted to the first engagement groove and the second engagement groove. The second keyway pressure block is inserted into the corresponding keyway, the second round rod slides through the corresponding round through hole and extends below the bottom wheel, and the limiting block on the second synchronous pressure rod is inserted into the corresponding second engagement groove, wherein the limiting block on the bottommost second synchronous pressure rod is inserted into the first engagement groove.

[0012] Furthermore, the topmost adjusting wheel is detachably fixed to the cover cylinder, the top of the main shaft is fixed to the cover cylinder by bolts, the top of the inner wall of the cover cylinder is provided with a motor holder, a second motor is detachably installed in the motor holder, the output shaft of the second motor is fixed to a docking block, and the bottom of the docking block is inserted into the second engagement groove opened on the top of the topmost second keyway pressure block. The second motor has an internal battery.

[0013] Furthermore, a pressure cylinder is detachably installed on the top of the outer cylinder, and an inner edge is provided at the bottom of the inner wall of the outer cylinder. The inner edge and the top of the grinding groove are both circumferentially provided with alignment holes. Alignment plugs corresponding to the alignment holes are fixedly connected to the bottom of the pressure cylinder and the grinding groove. Adjacent grinding grooves are mated by inserting the alignment plug of the upper grinding groove into the corresponding alignment hole of the lower grinding groove. Among them, the alignment plug of the bottom groove is inserted into the alignment socket opened on the inner edge; The pressure cylinder is connected to the alignment socket on the topmost grinding groove via the alignment plug at its bottom; The outer wall of the outer cylinder is provided with several atomizer interfaces, and atomizing nozzles are plugged into the atomizer interfaces. The nozzles of the atomizing nozzles penetrate the grinding groove and extend to the space between the crushing blades and the grinding groove. The liquid inlet of the atomizing nozzle is connected to the coating agent supply tank via an external pump.

[0014] Furthermore, a powder pump is installed at the top of the pressure cylinder.

[0015] (III) Beneficial Effects Compared with the prior art, the beneficial effects of the present invention are as follows: I. In this invention, during the rotation of the impeller, the impeller draws in the raw material in the feeding chamber through the air inlet and moves it between the deagglomeration structure and the grinding trough under centrifugal force. With the cooperation of the deagglomeration structure and the grinding trough, the raw material particles that are spirally rising are crushed. When it is necessary to increase or decrease the particle size of the crushed particles, the airflow speed and the magnitude of the centrifugal force are changed by controlling the contraction or extension of the crushing blades. At the same time, the distance between the crushing blades and the grinding trough is changed to control the collision frequency of the raw material particles in the grinding trough, thereby changing the particle size of the raw material particles. There is no need to adjust the rotation speed of the main shaft, so that the impeller can maintain the original speed and feed the raw material evenly.

[0016] Second, in this invention, when installing the depolymerization structure, the partition not only limits and supports the crushing blades to facilitate installation by the staff, but also isolates the two sides of the crushing blades from the cavity, preventing some raw materials from falling into the cavity along the grooves on the crushing blades. As these raw materials accumulate in the cavity, the overall weight of the depolymerization structure increases, resulting in increased power consumption.

[0017] Third, in this invention, after the adjusting wheel is installed on the top of the crushing blade, the inner connecting cylinder is inserted into the corresponding outer connecting cylinder, and the inner connecting cylinder and the outer connecting cylinder are fixed by bolts and nuts; thereby fixing the installed bottom wheel, adjusting wheel and crushing blade, and preventing the bottom wheel and adjusting wheel from separating or falling off during operation.

[0018] Fourth, in this invention, during rotation, the main shaft drives the entire depolymerization structure to rotate in the same direction under the cooperation of the snap-fit ​​protrusion and the main shaft limiting sleeve. The main shaft limiting sleeve can increase the contact area with the main shaft and the snap-fit ​​protrusion, thereby effectively dispersing the stress transmitted to the snap-fit ​​protrusion by the main shaft limiting sleeve when the depolymerization structure rotates, and avoiding fatigue fracture and deformation of the snap-fit ​​protrusion due to local stress concentration.

[0019] Fifth, in this invention, the composite limiting plate not only supports the bottom of the umbrella-shaped push-pull plate with two bottom support strips, but also limits the top and sides of the umbrella-shaped push-pull plate with limiting sliders. At the same time, two locking blocks can limit the top of the umbrella-shaped push-pull plate on the side away from the limiting sliders, so as to prevent the umbrella-shaped push-pull plate from tilting when moving.

[0020] VI. In this invention, two adjacent composite limiting plates are staggered vertically, and multiple composite limiting plates on the lower plane are at the same horizontal height, while multiple composite limiting plates on the higher plane are at the same horizontal height. This avoids interference between two adjacent umbrella-type push-pull plates when they retract. At the same time, when the umbrella-type push-pull plates expand or retract, the staggered umbrella-type push-pull plates can cooperate with each other to push the crushing blades at the gap.

[0021] VII. In this invention, during the installation of multiple deagglomeration structures on the main shaft, except for the bottommost deagglomeration structure, a second synchronous pressure rod is inserted for each of the remaining deagglomeration structures, thereby aligning two adjacent main gear discs. The second keyway pressure block can limit the corresponding main gear disc, and the second round rod can ensure that the end of the second synchronous pressure rod with the limit block passes smoothly through the corresponding bottom wheel disc and engages with the second engagement groove below it through the limit block. At the same time, when the second synchronous pressure rod rotates, the second round rod will not interfere with the rotation of the bottom wheel disc or the adjusting wheel disc. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the entire invention; Figure 2 This is a cross-sectional view of the base, outer cylinder, and pressure cylinder in this invention; Figure 3 This is a cross-sectional view of the base, outer cylinder, and pressure cylinder from another perspective in this invention; Figure 4 This is an exploded schematic diagram of the central shaft platform, the disintegrating wheel, and the wind turbine in this invention; Figure 5 for Figure 4 A magnified view of a portion of point A in the middle; Figure 6 This is an exploded view of the depolymerization structure, the first synchronous pressure bar, and the second synchronous pressure bar in this invention; Figure 7 This is a bottom view of the bottom wheel in this invention; Figure 8 This is an exploded view of the bottom wheel, crushing blades, and adjusting wheel in this invention; Figure 9 This is a schematic diagram of the first keyway pressure block and the first round rod in this invention; Figure 10 This is an exploded view of the adjusting wheel, adjusting gear disc, limiting pressure plate, main gear disc, and second synchronous pressure rod in this invention; Figure 11 This is an exploded view of the composite limiting plate, umbrella-shaped push-pull plate, and limiting rod in this invention; Figure 12 This is a cross-sectional view of the cover cylinder in this invention; Figure 13 This is an exploded view of the outer cylinder, grinding groove, and pressure cylinder in this invention; Figure 14 This is an exploded view of the outer cylinder, grinding groove, and pressure cylinder from another perspective in this invention.

[0023] In the diagram: 1. Base; 101. Feed chamber; 11. Outer cylinder; 1101. Inner edge; 12. Pressure cylinder; 13. Powder pump; 14. Shaft platform; 15. First motor; 16. Partition plate; 2. Main shaft; 201. Snap-fit ​​protrusion; 21. Dispersing wheel; 22. Wind wheel; 3. Bottom wheel plate; 301. Groove; 302. Connecting plug; 303. Sliding groove; 31. Adjusting wheel plate; 3101. Connecting slot; 3102. Guide groove; 32. Crushing blade; 321. Slide rod; 33. Composite limiting plate; 3301. Bottom support bar; 3302. Limiting slider; 34. Umbrella-type push-pull plate; 3401. Arc groove; 3402. Through groove; 341. Slider; 342. Limiting rod; 343. Locking block; 3 5. Adjusting gear plate; 3501. Guide groove; 36. Main gear plate; 3601. Keyway; 37. Main shaft limiting sleeve; 38. Docking boss; 39. Limiting pressure plate; 310. Inner docking cylinder; 311. Outer docking cylinder; 312. Spacer; 4. Grinding groove; 401. Alignment insertion hole; 402. Alignment plug; 5. First synchronous pressure rod; 51. First keyway pressure block; 5101. First engagement groove; 52. First round rod; 6. Second synchronous pressure rod; 61. Second keyway pressure block; 6101. Second engagement groove; 62. Second round rod; 63. Limiting insertion block; 7. Cover cylinder; 701. Motor holder; 71. Second motor; 72. Docking insertion block; 8. Atomizer interface; 81. Atomizing nozzle; 9. Cavity. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1 like Figures 1-14 As shown, a production device for surface coating modification of lithium iron phosphate particles with adjustable particle size includes a base 1 and an outer cylinder 11 fixed to the base 1. The base 1 is provided with a feeding chamber 101, and a main shaft 2 is mounted on the base 1. The main shaft 2 rotates through the feeding chamber 101 and extends upward. From bottom to top, the main shaft 2 is equipped with a dispersing wheel 21, a blower 22, and multiple retractable and adjustable deagglomeration structures. Specifically, it combines... Figures 1-4A shaft platform 14 is fixedly installed inside the base 1. The main shaft 2 is rotatably inserted into the shaft platform 14, and the bottom of the main shaft 2 extends to the bottom of the shaft platform 14. A first motor 15 is installed on the top of the base 1. The output shaft of the first motor 15 extends into the base 1, and the main shaft 2 is connected to the output shaft of the first motor 15 through a synchronous belt drive. The raw material is sent to the feeding chamber 101 through the hot air blower. When the output shaft of the first motor 15 rotates, it drives the main shaft 2 to rotate synchronously through the synchronous belt. The disintegrating wheel 21 is fixedly sleeved on the main shaft 2, such as Figure 5 As shown, the main shaft 2 is integrally equipped with multiple snap-fit ​​protrusions 201 in a circular pattern. The impeller 22 and the deagglomeration structure are both inserted into the main shaft 2 with snap-fit ​​protrusions 201. When the main shaft 2 rotates, it also drives the dispersing wheel 21, the impeller 22, and the deagglomeration structure to rotate synchronously. The dispersing wheel 21 is located in the feed chamber 101, and the impeller 22 is located in the outer cylinder 11. The dispersing wheel 21 disperses the raw materials in the feed chamber 101, such as... Figure 3 As shown, a partition 16 is detachably installed on the top of the feeding chamber 101. The partition 16 has an air inlet, and the feeding chamber 101 is connected to the inner cavity of the outer cylinder 11 through the air inlet. Figure 2 As shown, the inner cylinder 11 is provided with a grinding groove 4 corresponding to the deagglomeration structure; during the rotation of the impeller 22, the impeller 22 will suck the raw material in the feed chamber 101 through the air inlet and move the raw material between the deagglomeration structure and the grinding groove 4 under the centrifugal action. As the deagglomeration structure rotates, it will drive the raw material between the deagglomeration structure and the grinding groove 4 to rotate and move upward with the rising airflow, so that the raw material spirals upward. With the cooperation of the deagglomeration structure and the grinding groove 4, the raw material particles in the spiral upward are crushed. like Figure 6 As shown, the deagglomeration structure includes a bottom wheel 3, an adjusting wheel 31, and multiple crushing blades 32 disposed between the bottom wheel 3 and the adjusting wheel 31, specifically: combined with Figure 8 and Figure 10 The bottom wheel 3 and the adjusting wheel 31 are both circumferentially provided with several sliding grooves 303 at their close ends. The upper and lower ends of the crushing blade 32 are slidably connected to the corresponding sliding grooves 303. During installation, the bottom of the crushing blade 32 is installed in the corresponding sliding groove 303. U-shaped partitions 312 are provided between two adjacent sliding grooves 303 on the bottom wheel 3. The crushing blade 32 slides in contact with the partitions 312 on both sides, and the partitions 312 slide in contact with the corresponding crushing blade 32. When installing the crushing blade 32, the partitions 312 can limit and support the crushing blade 32 to facilitate the installation by the staff. After installation, the corresponding adjusting wheel 31 is installed on the top of the crushing blade 32 through the sliding groove 303 at its bottom. like Figure 6As shown, the adjusting wheel 31 has a groove 301, and an adjusting gear 35 and a main gear 36 meshing with the adjusting gear 35 are rotatably connected to the groove 301. Specifically, they are combined... Figures 6-10 The top of the bottom wheel 3 is also provided with a main shaft limiting sleeve 37, and the adjusting wheel 31 is provided with a docking boss 38. When the adjusting wheel 31 is installed on the top of the crushing blade 32, the top of the main shaft limiting sleeve 37 will be inserted into the docking boss 38, and the adjusting toothed disc 35 will be rotated and fitted onto the docking boss 38. The top of the docking boss 38 is detachably installed with a limiting pressure plate 39. The bottom of the limiting pressure plate 39 slides in contact with the top of the adjusting toothed disc 35. The top of the adjusting toothed disc 35 can be limited by the limiting pressure plate 39. The top of the bottom wheel 3 is provided with multiple inner connecting cylinders 310, and the top of the adjusting wheel 31 is provided with outer connecting cylinders 311 corresponding to the inner connecting cylinders 310. When the adjusting wheel 31 is installed on the top of the crushing blade 32, the inner connecting cylinders 310 are inserted into the corresponding outer connecting cylinders 311. The inserted inner connecting cylinders 310 and outer connecting cylinders 311 are fixed by bolts and nuts. This fixes the installed bottom wheel 3, adjusting wheel 31 and crushing blade 32, preventing the bottom wheel 3 from separating from the adjusting wheel 31 and falling off during operation. After assembling the bottom wheel 3, adjusting wheel 31, and multiple crushing blades 32, the deagglomeration structure is inserted into the main shaft 2 with snap-fit ​​protrusions 201 via the main shaft limiting sleeve 37. Multiple deagglomeration structures are provided, as shown in the reference. Figure 3 and Figure 12 The staff needs to install these depolymerization structures one by one on the main shaft 2 with snap-fit ​​protrusions 201; Furthermore, such as Figure 4 , Figure 6 and Figure 7 As shown, the bottom of the bottom wheel 3 is fixed with a docking plug 302 in a circular shape. The top of the impeller 22 and the adjusting wheel 31 are provided with docking slots 3101 that correspond one-to-one with the docking plugs 302. When two adjacent depolymerization structures are docked, the adjusting wheel 31 in one of the depolymerization structures is connected to the docking plug 302 on the bottom wheel 3 of the other depolymerization structure above it through the docking slot 3101. The impeller 22 is connected to the bottom wheel 3 of the depolymerization structure above it via the docking slot 3101 and the docking plug 302. This connects the bottom depolymerization structure to the impeller 22. When rotating, the main shaft 2 drives the entire depolymerization structure to rotate in the same direction with the cooperation of the snap-fit ​​protrusion 201 and the main shaft limiting sleeve 37. The main shaft limiting sleeve 37 increases the contact area with the main shaft 2 and the snap-fit ​​protrusion 201, thereby effectively dispersing the stress transmitted from the main shaft limiting sleeve 37 to the snap-fit ​​protrusion 201 when the depolymerization structure rotates, and preventing the snap-fit ​​protrusion 201 from fatigue fracture and deformation due to local stress concentration. like Figures 6-11 As shown, multiple composite limiting plates 33 are circumferentially mounted on the adjusting wheel 31, and umbrella-shaped push-pull plates 34 are slidably connected to the composite limiting plates 33, such as... Figure 10 As shown, the top of the adjusting gear plate 35 is provided with a guide groove 3501 corresponding to the umbrella-shaped push-pull plate 34, combined with Figure 6 and Figure 10 One end of the umbrella-shaped push-pull plate 34 is fixedly connected to a slider 341, and the slider 341 is slidably connected to the corresponding guide groove 3501. The guide groove 3501 is arc-shaped, specifically as follows: Figure 11 As shown, the composite limiting plate 33 includes two bottom support bars 3301 and a U-shaped limiting slider 3302. One end of the two bottom support bars 3301 is integrally fixed to both ends of the limiting slider 3302, and the other end is detachably fixed to the adjusting gear plate 35. The umbrella-shaped push-pull plate 34 is slidably inserted into the limiting slider 3302, and the bottom of the limiting slider 3302 slides in contact with the top of the two bottom support bars 3301. Furthermore, in combination Figure 6 and Figure 11 The umbrella-shaped push-pull plate 34 is symmetrically provided with through grooves 3402. The two bottom support bars 3301 on the same composite limiting plate 33 are threadedly connected with limiting rods 342. The limiting rods 342 extend out of the corresponding through grooves 3402, and the top of the limiting rods 342 is integrally provided with locking blocks 343. The top of the umbrella-shaped push-pull plate 34 and the bottom of the locking blocks 343 slide in contact. During installation, first place the umbrella-shaped push-pull plate 34 on top of the bottom support strip 3301. Then, pass the end of the umbrella-shaped push-pull plate 34 with the slider 341 through the limiting slider 3302. Next, insert the limiting rod 342 with the locking block 343 along the corresponding through groove 3402 and thread it onto the bottom support strip 3301. Then, quickly fix the ends of the two bottom support strips 3301 away from the slider 341 onto the adjusting gear plate 35 with screws. The composite limiting plate 33 not only supports the bottom of the umbrella-shaped push-pull plate 34 through the two bottom support strips 3301, but also limits the top and sides of the umbrella-shaped push-pull plate 34 through the limiting slider 3302. At the same time, the two locking blocks 343 can limit the top of the umbrella-shaped push-pull plate 34 on the side away from the limiting slider 3302, preventing the umbrella-shaped push-pull plate 34 from tilting when moving. Combination Figure 6 , Figure 8 and Figure 10 The adjusting wheel 31 has several guide grooves 3102 that correspond one-to-one with the slide bar 321. The umbrella-shaped push-pull plate 34 has an arc groove 3401. The top of the crushing blade 32 has a slide bar 321, and the slide bar 321 passes through the corresponding guide groove 3102 and extends into the corresponding arc groove 3401.

[0026] During adjustment: When the adjusting toothed disc 35 rotates clockwise, the arc-shaped guide groove 3501 will pull the umbrella-shaped push-pull plate 34 inward through the slider 341. The umbrella-shaped push-pull plate 34 will pull the corresponding slide rod 321 inward through the arc groove 3401, thereby pulling the corresponding crushing blade 32 inward and causing it to retract. When the adjusting toothed disc 35 rotates counterclockwise, the arc-shaped guide groove 3501 will push the umbrella-shaped push-pull plate 34 outward through the slider 341. The umbrella-shaped push-pull plate 34 pushes the corresponding slide rod 321 outward through the arc groove 3401, thereby pushing the corresponding crushing blade 32 outward and extending it. Among them, such as Figure 6As shown, two adjacent composite limiting plates 33 are staggered vertically, and multiple composite limiting plates 33 located on the lower plane are at the same horizontal height, while multiple composite limiting plates 33 located on the upper plane are at the same horizontal height. When setting the umbrella-type push-pull plate 34, if the umbrella-type push-pull plate 34 is only set at one horizontal height, a gap will appear between two adjacent umbrella-type push-pull plates 34 during the outward expansion of the umbrella-type push-pull plate 34. As the umbrella-type push-pull plate 34 continues to move, this gap will become larger and larger, and the crushing blade 32 located in the gap area cannot be pushed. Therefore, another umbrella-type push-pull plate 34 is set between two adjacent umbrella-type push-pull plates 34 at the same height, and the two are staggered vertically to avoid interference between the two adjacent umbrella-type push-pull plates 34 when they contract. At the same time, when the umbrella-type push-pull plate 34 expands or contracts, the staggered umbrella-type push-pull plates 34 can cooperate with each other to push the crushing blade 32 in the gap.

[0027] Among them, when the bottom wheel 3, the adjusting wheel 31, and the multiple crushing blades 32 are combined, they are combined with Figure 6 and Figure 8 A cavity 9 is formed between the bottom wheel 3, the adjusting wheel 31, and the multiple crushing blades 32. In order to reduce the weight of the crushing blades 32, the operator can make some slots on the crushing blades 32 to reduce the weight of the crushing blades 32. By using the U-shaped partitions 312 set on both sides of the sliding groove 303, the two sides of the crushing blades 32 can be isolated from the cavity 9, preventing some raw materials from falling into the cavity 9 along the slots on the crushing blades 32. As these raw materials accumulate in the cavity 9, the overall weight of the deagglomeration structure increases, resulting in increased power consumption.

[0028] like Figure 6 As shown, two adjacent main gear discs 36 are connected via the second synchronous pressure rod 6, specifically: [The text abruptly ends here, likely due to an incomplete sentence or a formatting error.] Figures 6-8 and Figure 10 The main gear plate 36 has a keyway 3601. The bottom of the keyway 3601 and the corresponding bottom wheel plate 3 and adjusting wheel plate 31 are all provided with circular through holes, and the circular through holes are connected to the keyway 3601. During the process of installing the depolymerization structures one by one on the main shaft 2, such as... Figure 6 and Figure 9 As shown, a first synchronous pressure rod 5 is inserted into the keyway 3601 on the bottom main gear disk 36. The first synchronous pressure rod 5 is divided into a first keyway pressure block 51 and a first round rod 52 from top to bottom. The first round rod 52 is slidably inserted into the corresponding round through hole. The first keyway pressure block 51 is inserted into the corresponding keyway 3601. A first engagement groove 5101 is provided on the top of the first keyway pressure block 51. The bottom main gear disk 36 can be limited by the first keyway pressure block 51. The remaining main gear discs 36 are all fitted with second synchronous pressure rods 6, such as Figure 10 As shown, the second synchronous pressure rod 6 is divided into a second keyway pressure block 61, a second round rod 62 and a limiting plug 63 from top to bottom. The top of the second keyway pressure block 61 is provided with a second engagement groove 6101. The limiting plug 63 is polygonal and is adapted to the first engagement groove 5101 and the second engagement groove 6101. The second keyway pressure block 61 is inserted into the corresponding keyway 3601. The second round rod 62 can slide through the corresponding round through hole and extend below the bottom wheel 3. The limiting block 63 on the second synchronous pressure rod 6 is inserted into the corresponding second engagement groove 6101. The second keyway pressure block 61 can limit the corresponding main gear 36. The second round rod 62 can ensure that the end of the second synchronous pressure rod 6 with the limiting block 63 passes smoothly through the corresponding bottom wheel 3 and engages with the second engagement groove 6101 below it through the limiting block 63. At the same time, when the second synchronous pressure rod 6 rotates, the second round rod 62 will not interfere with the rotation of the bottom wheel 3 or the adjustment wheel 31. The limiting block 63 on the bottommost second synchronous pressure rod 6 is inserted into the first engagement groove 5101. During the installation of multiple deaggregating structures on the main shaft 2, except for the bottommost deaggregating structure, a corresponding second synchronous pressure rod 6 is inserted for each of the remaining deaggregating structures, thereby aligning two adjacent main gear discs 36.

[0029] Furthermore, in combination Figure 3 and Figure 12 The topmost adjusting wheel 31 is detachably bolted to a cover cylinder 7. The top of the main shaft 2 is bolted to the cover cylinder 7. The cover cylinder 7 covers the top of the top adjusting wheel 31, preventing raw materials from falling into the groove 301. A motor holder 701 is provided on the top of the inner wall of the cover cylinder 7. A second motor 71 is detachably installed in the motor holder 701. The motor holder 701 can limit the movement of the second motor 71. The output shaft of the second motor 71 is fixedly connected to a docking block 72. When it is necessary to drive the adjusting gear 35 to rotate, the second motor 71 is connected to the mating block 72. The output shaft of the second motor 71 drives the docking block 72 to rotate. The bottom of the docking block 72 is inserted into the second engagement groove 6101 opened on the top of the uppermost second keyway pressure block 61. When the docking block 72 rotates, it drives the uppermost second keyway pressure block 61 to rotate through the second engagement groove 6101. Under the action of the keyway 3601, the second keyway pressure block 61 drives the main gear disk 36 to rotate. When the uppermost main gear disk 36 rotates, under the action of the second synchronous pressure rod 6, it drives the other main gear disks 36 to rotate synchronously, thereby making the crushing blades 32 synchronously adjusted.

[0030] Meanwhile, the second motor 71 is equipped with a battery inside, which powers the second motor 71. The staff only needs to replace the battery or charge it periodically.

[0031] Furthermore, such as Figure 2 , Figure 13 and Figure 14 As shown, a pressure cylinder 12 is detachably installed on the top of the outer cylinder 11. An inner edge 1101 is provided at the bottom of the inner wall of the outer cylinder 11. Both the inner edge 1101 and the top of the grinding groove 4 are provided with a circumferentially shaped alignment hole 401. The pressure cylinder 12 and the bottom of the grinding groove 4 are fixedly connected with an alignment plug 402 corresponding to the alignment hole 401. Two adjacent grinding grooves 4 are mated by inserting the alignment plug 402 of the upper grinding groove 4 into the corresponding alignment hole 401 of the lower grinding groove 4. Among them, the alignment plug 402 of the bottom grinding groove 4 is inserted into the alignment socket 401 opened on the inner edge 1101. The bottom grinding groove 4 can be limited by the alignment socket 401 opened on the inner edge 1101. The two adjacent grinding grooves 4 are limited and connected by the cooperation of the corresponding alignment socket 401 and alignment plug 402. The pressure cylinder 12 is connected to the alignment hole 401 on the topmost grinding groove 4 via the alignment plug 402 at its bottom. The pressure cylinder 12 can limit and align the topmost grinding groove 4, ensuring the stability of the grinding groove 4 after it is installed on the outer cylinder 11.

[0032] Specifically, when the crushing blades 32 rotate, they drive the airflow to form a vortex, thereby generating intense shearing force, friction force and centrifugal force. The agglomerated raw material particles collide, rub and shear repeatedly with the crushing blades 32 and the grinding groove 4, thereby crushing large raw material particles into small particles. When the crushing blades 32 contract, the airflow speed decreases, resulting in a reduction in centrifugal force. At the same time, the distance between the crushing blades 32 and the grinding groove 4 increases, thereby reducing the collision frequency of raw material particles in the grinding groove 4 and increasing the particle size of the raw material particles. like Figure 1 and Figure 2 As shown, the outer wall of the outer cylinder 11 is provided with several atomizer interfaces 8, and atomizer nozzles 81 are inserted into the atomizer interfaces 8. The nozzles of the atomizer nozzles 81 penetrate the grinding groove 4 and extend to the space between the crushing blades 32 and the grinding groove 4. The liquid inlet of the atomizing nozzle 81 is connected to the coating agent supply tank through an external pump. The coating agent is sprayed into the space between the crushing blade 32 and the grinding groove 4 in an atomized form through the atomizing nozzle 81. The coating agent will cover the surface of the particles for coating. Furthermore, a powder pump 13 is provided at the top of the pressure cylinder 12. The coated raw material particles flow into the powder pump 13 with the rising airflow and are discharged through the powder pump 13.

[0033] In summary, the workflow of this invention is as follows: During installation, the disintegrating wheel 21 is solidly fitted onto the main shaft 2, then the partition plate 16 is installed. Next, the impeller 22 is inserted into the main shaft 2 with the snap-fit ​​protrusion 201. Then, the assembled disintegrating structures are sequentially installed onto the main shaft 2 with the snap-fit ​​protrusion 201. During the installation process, a corresponding grinding groove 4 is installed for each disintegrating structure installed. At the same time, except for the bottom disintegrating structure, a second synchronous pressure rod 6 is inserted for each of the remaining disintegrating structures placed, thereby aligning the two adjacent main gear discs 36. After all the disintegrating structures are installed, the fixed connection is... The docking block 72 on the output shaft of the second motor 71 is inserted into the second engagement groove 6101. Then, the cover cylinder 7 is fixed to the top adjusting wheel 31 with bolts. At the same time, the main shaft 2 is fixed to the cover cylinder 7 with bolts. After all the grinding grooves 4 are installed, the pressure cylinder 12 is installed on the top of the outer cylinder 11. The pressure cylinder 12 can limit and dock the top grinding groove 4 to ensure the stability of the grinding groove 4 after it is installed in the outer cylinder 11. Then, the atomizing nozzle 81 is inserted into the atomizer interface 8. The nozzle of the atomizing nozzle 81 passes through the grinding groove 4 and extends to the space between the pulverizing blade 32 and the grinding groove 4.

[0034] During operation, the raw materials are fed into the feed chamber 101 via a hot air blower. When the output shaft of the first motor 15 rotates, it drives the main shaft 2 to rotate synchronously via a synchronous belt. When the main shaft 2 rotates, it also drives the dispersing wheel 21, the impeller 22, and the deagglomeration structure to rotate synchronously. When the crushing blades 32 rotate, they drive the airflow to form a vortex, thereby generating intense shearing force, friction force, and centrifugal force. The agglomerated raw material particles repeatedly collide, rub, and shear with the crushing blades 32 and the grinding groove 4, thereby crushing the large raw material particles into small particles. When it is necessary to increase the particle size, the output shaft of the second motor 71 drives the docking block 72 to rotate counterclockwise. When the docking block 72 rotates, it drives the topmost second keyway pressing block 61 to rotate in the same direction through the second engaging groove 6101. The second keyway pressure block 61 drives the main gear disk 36 to rotate in the same direction under the action of the keyway 3601. When the top main gear disk 36 rotates, it drives the other main gear disks 36 to rotate synchronously under the action of the second synchronous pressure rod 6. Under the meshing action, it drives the corresponding adjusting gear disk 35 to rotate clockwise. When the adjusting gear disk 35 rotates clockwise, the arc-shaped guide groove 3501 will pull the umbrella-shaped push-pull plate 34 inward through the slider 341. The umbrella-shaped push-pull plate 34 pulls the corresponding slide rod 321 inward through the arc groove 3401, thereby pulling the corresponding crushing blade 32 inward and causing it to retract. When the crushing blade 32 retracts, the airflow speed decreases, resulting in a reduction in centrifugal force, thereby reducing the collision frequency of raw material particles in the grinding tank 4 and increasing the particle size of the raw material particles. When smaller particles of raw material are required, the output shaft of the second motor 71 drives the docking block 72 to rotate clockwise. As the docking block 72 rotates, it drives the topmost second keyway pressing block 61 to rotate in the same direction via the second engaging groove 6101. The second keyway pressing block 61, under the action of the keyway 3601, drives the main gear disk 36 to rotate in the same direction. When the topmost main gear disk 36 rotates, it drives the remaining main gear disks 36 to rotate synchronously under the action of the second synchronous pressing rod 6, thus driving the meshing action. The corresponding adjusting toothed disc 35 rotates counterclockwise. When the adjusting toothed disc 35 rotates counterclockwise, the arc-shaped guide groove 3501 will push the umbrella-shaped push-pull plate 34 outward through the slider 341. The umbrella-shaped push-pull plate 34 pushes the corresponding slide rod 321 outward through the arc groove 3401, thereby pushing the corresponding crushing blade 32 outward and extending it. As the crushing blade 32 extends, the airflow speed increases and the centrifugal force increases, thereby accelerating the collision frequency of raw material particles in the grinding tank 4, thereby reducing the particle size of the raw material particles. The liquid inlet of the atomizing nozzle 81 is connected to the coating agent supply tank through an external pump. The coating agent is sprayed into the space between the crushing blade 32 and the grinding groove 4 in an atomized form through the atomizing nozzle 81. The coating agent will cover the surface of the particles and coat them. The coated raw material particles flow into the powder pump 13 with the rising airflow and are discharged through the powder pump 13.

[0035] However, as is well known to those skilled in the art, the working principles and wiring methods of the powder pump 13, the first motor 15, and the second motor 71 are commonplace and belong to conventional methods or common knowledge. Therefore, they will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0036] The different embodiments described above can be combined, substituted, or used in combination with each other.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A production apparatus for surface coating modification of lithium iron phosphate particles with adjustable particle size, comprising a base (1) and an outer cylinder (11) fixed to the base (1), characterized in that: The base (1) is provided with a feeding chamber (101), and a main shaft (2) is installed on the base (1). The main shaft (2) rotates through the feeding chamber (101) and extends upward. The main shaft (2) is provided with a dispersing wheel (21), a blower (22) and multiple retractable and adjustable deagglomeration structures in sequence from bottom to top. The deagglomeration structure includes a bottom wheel (3), an adjusting wheel (31), and multiple crushing blades (32) disposed between the bottom wheel (3) and the adjusting wheel (31). The adjusting wheel (31) is provided with a groove (301), and multiple composite limiting plates (33) are installed on the adjusting wheel (31). An umbrella-type push-pull plate (34) is slidably connected to the composite limiting plate (33). An adjusting gear plate (35) and a main gear plate (36) meshing with the adjusting gear plate (35) are rotatably connected on the groove (301). The top of the adjusting gear plate (35) is provided with a guide groove (3501) corresponding to the umbrella-type push-pull plate (34). One end of the umbrella-type push-pull plate (34) is fixedly connected with a slider (341), and the slider (341) is slidably connected with the corresponding guide groove (3501). The umbrella-type push-pull plate (34) is provided with an arc groove (3401). The top of the crushing blade (32) is provided with a slide rod (321), and the slide rod (321) extends into the corresponding arc groove (3401). The outer cylinder (11) is provided with a grinding groove (4) corresponding to the depolymerization structure; Two adjacent main gear discs (36) are connected by a second synchronous pressure rod (6); The top of the outer cylinder (11) is provided with a pressure cylinder (12), and the top of the pressure cylinder (12) is open.

2. The production apparatus for surface coating modification of adjustable particle size lithium iron phosphate particles according to claim 1, characterized in that: A shaft platform (14) is fixedly installed inside the base (1). The main shaft (2) is rotatably inserted into the shaft platform (14), and the bottom of the main shaft (2) extends to the bottom of the shaft platform (14). A first motor (15) is installed on the top of the base (1). The output shaft of the first motor (15) extends into the base (1), and the main shaft (2) and the output shaft of the first motor (15) are connected by a synchronous belt drive. The dispersing wheel (21) is fixedly sleeved on the main shaft (2). The main shaft (2) is provided with multiple snap-fit ​​protrusions (201) in a circular shape. The impeller (22) and the deagglomeration structure are both inserted into the main shaft (2) with snap-fit ​​protrusions (201). The dispersing wheel (21) is located in the feed chamber (101), and the impeller (22) is located in the outer cylinder (11); A partition (16) is detachably installed on the top of the feeding chamber (101). The partition (16) is provided with an air inlet. The feeding chamber (101) is connected to the inner cavity of the outer cylinder (11) through the air inlet.

3. The production apparatus for surface coating modification of adjustable particle size lithium iron phosphate particles according to claim 2, characterized in that: The bottom of the bottom wheel (3) is fixed with a docking plug (302) in a circular shape. The top of the wind wheel (22) and the adjusting wheel (31) are provided with docking slots (3101) that correspond one-to-one with the docking plugs (302). The adjusting wheel (31) in one of the depolymerization structures is connected to the docking plug (302) on the bottom wheel (3) in the other depolymerization structure above it through the docking slot (3101). The impeller (22) is connected to the bottom wheel (3) in the depolymerization structure above it via a docking slot (3101) and a docking plug (302).

4. The production apparatus for surface coating modification of adjustable particle size lithium iron phosphate particles according to claim 2, characterized in that: The bottom wheel (3) and the adjusting wheel (31) are both provided with a number of sliding grooves (303) in a circular shape at their close ends. The upper and lower ends of the crushing blade (32) are slidably connected to the corresponding sliding grooves (303). The top of the bottom wheel (3) is also provided with a spindle limiting sleeve (37), and the adjusting wheel (31) is provided with a docking boss (38). The top of the spindle limiting sleeve (37) is inserted into the docking boss (38), the adjusting gear (35) is rotated and sleeved on the docking boss (38), and the top of the docking boss (38) is detachably installed with a limiting pressure plate (39). The bottom of the limiting pressure plate (39) slides in contact with the top of the adjusting gear (35), and the spindle limiting sleeve (37) is inserted into the spindle (2) with a snap-fit ​​protrusion (201). The top of the bottom wheel (3) is provided with multiple inner docking cylinders (310), and the top of the adjusting wheel (31) is provided with an outer docking cylinder (311) corresponding to the inner docking cylinder (310). The inner docking cylinder (310) is inserted into the corresponding outer docking cylinder (311) and fixed by bolts and nuts.

5. The production apparatus for surface coating modification of adjustable particle size lithium iron phosphate particles according to claim 4, characterized in that: The bottom wheel disk (3) is provided with a U-shaped partition (312) between two adjacent sliding grooves (303), and the crushing blade (32) slides in contact with the partitions (312) on both sides; The guide groove (3501) is arc-shaped; The composite limiting plate (33) is circumferentially mounted on the adjusting wheel (31). The composite limiting plate (33) includes two bottom support bars (3301) and an inverted U-shaped limiting slider (3302). One end of the two bottom support bars (3301) is integrally fixed to both ends of the limiting slider (3302), and the other end is detachably fixed to the adjusting gear plate (35). The umbrella-shaped push-pull plate (34) is slidably inserted into the limiting slider (3302), and the bottom of the limiting slider (3302) slides in contact with the top of the two bottom support bars (3301). The adjusting wheel (31) has several guide grooves (3102) that correspond one-to-one with the slide rod (321). The slide rod (321) passes through the corresponding guide groove (3102) and extends into the corresponding arc groove (3401).

6. The production apparatus for surface coating modification of adjustable particle size lithium iron phosphate particles according to claim 5, characterized in that: The umbrella-shaped push-pull plate (34) is symmetrically provided with through slots (3402). The two bottom support bars (3301) on the same composite limiting plate (33) are threaded with limiting rods (342). The limiting rods (342) extend out of the corresponding through slots (3402), and the top of the limiting rods (342) is integrally provided with locking blocks (343). The top of the umbrella-shaped push-pull plate (34) slides in contact with the bottom of the locking blocks (343). The two adjacent composite limiting plates (33) are staggered vertically, and the multiple composite limiting plates (33) located on the lower plane are at the same horizontal height, and the multiple composite limiting plates (33) located on the upper plane are at the same horizontal height.

7. The production apparatus for surface coating modification of adjustable particle size lithium iron phosphate particles according to claim 6, characterized in that: The main gear plate (36) is provided with a keyway (3601). The bottom of the keyway (3601) and the corresponding bottom wheel plate (3) and adjusting wheel plate (31) are provided with circular through holes, and the circular through holes are connected to the keyway (3601). Among them, the keyway (3601) on the bottommost main gear plate (36) is connected to the first synchronous pressure rod (5). The first synchronous pressure rod (5) is divided into the first keyway pressure block (51) and the first round rod (52) from top to bottom. The first round rod (52) is slidably inserted into the corresponding round through hole. The first keyway pressure block (51) is inserted into the corresponding keyway (3601). The top of the first keyway pressure block (51) is provided with the first engagement groove (5101). The remaining main gear discs (36) are all connected with second synchronous pressure rods (6). The second synchronous pressure rods (6) are divided into second keyway pressure blocks (61), second round rods (62) and limiting blocks (63) from top to bottom. The top of the second keyway pressure block (61) is provided with a second engagement groove (6101). The limiting block (63) is polygonal and is adapted to the first engagement groove (5101) and the second engagement groove (6101). The second keyway pressure block (61) is inserted into the corresponding keyway (3601), the second round rod (62) slides through the corresponding round through hole and extends below the bottom wheel (3), and the limiting plug (63) on the second synchronous pressure rod (6) is inserted into the corresponding second engagement groove (6101), wherein the limiting plug (63) on the bottommost second synchronous pressure rod (6) is inserted into the first engagement groove (5101).

8. The production apparatus for surface coating modification of adjustable particle size lithium iron phosphate particles according to claim 7, characterized in that: The topmost adjusting wheel (31) is detachably fixed to the cover cylinder (7). The top of the main shaft (2) is fixed to the cover cylinder (7) by bolts. The top of the inner wall of the cover cylinder (7) is provided with a motor holder (701). A second motor (71) is detachably installed in the motor holder (701). The output shaft of the second motor (71) is fixed to a docking block (72). The bottom of the docking block (72) is inserted into the second engagement groove (6101) opened on the top of the topmost second keyway pressure block (61). The second motor (71) has a battery installed inside.

9. The production apparatus for surface coating modification of adjustable particle size lithium iron phosphate particles according to claim 1, characterized in that: The top of the outer cylinder (11) is detachably equipped with a pressure cylinder (12). The bottom of the inner wall of the outer cylinder (11) is provided with an inner edge (1101). The inner edge (1101) and the top of the grinding groove (4) are both circumferentially provided with alignment holes (401). The bottom of the pressure cylinder (12) and the grinding groove (4) are fixedly connected with alignment plugs (402) corresponding to the alignment holes (401). The two adjacent grinding grooves (4) are connected by inserting the alignment plug (402) of the upper grinding groove (4) into the corresponding alignment hole (401) of the lower grinding groove (4). Among them, the alignment plug (402) of the bottommost groove (4) is inserted into the alignment socket (401) opened on the inner edge (1101); The pressure cylinder (12) is connected to the alignment socket (401) on the topmost grinding groove (4) via the alignment plug (402) at its bottom; The outer wall of the outer cylinder (11) is provided with several atomizer interfaces (8), and the atomizer interfaces (8) are connected to atomizing nozzles (81). The nozzles of the atomizing nozzles (81) penetrate the grinding groove (4) and extend to the space between the crushing blades (32) and the grinding groove (4). The liquid inlet of the atomizing nozzle (81) is connected to the coating agent supply tank via an external pump.

10. The production apparatus for surface coating modification of adjustable particle size lithium iron phosphate particles according to claim 9, characterized in that: A powder pump (13) is installed on the top of the pressure cylinder (12).

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