Low temperature sanding equipment adapted for lithium battery solid state electrolyte materials

Abstract

This invention relates to the field of battery material recycling technology, specifically to a low-temperature grinding equipment adapted for lithium battery solid electrolyte materials. The equipment includes a grinding frame, inside which a feed cylinder, a feeding cylinder, and a grinding cylinder are arranged sequentially along the transverse direction. The feeding cylinder and the grinding cylinder are fixedly connected. This invention achieves stable transport and pre-screening of lithium battery solid electrolyte materials in a low-temperature range through a three-stage graded cylinder structure and a closed-loop coolant circulation system. This effectively inhibits material agglomeration and deterioration of physicochemical properties, significantly reducing the load on subsequent grinding processes. It also features a low-temperature grinding mechanism that relies on the coordinated rotation of the grinding roller and the cooling cylinder under magnetic repulsion drive to form dynamic shear force to break up electrolyte particle agglomerates. Continuous low temperature inhibits electrolyte oxidation and decomposition, while adapting to the differentiated grinding process requirements of materials with different particle sizes, ensuring product performance stability.

Description

Technical Field

[0001] This invention relates to the field of battery material recycling technology, specifically to a low-temperature sand milling device adapted to solid electrolyte materials for lithium batteries. Background Technology

[0002] As a core component of lithium batteries, the uniformity of solid electrolyte particle size, purity, and integrity of crystal structure directly determine the battery's ionic conductivity, interface stability, and cycle life. To meet the requirements of high-performance solid batteries, solid electrolytes need to be ground to the nanoscale, and the temperature must be strictly controlled during the grinding process to avoid metal contamination and oxidation reactions.

[0003] However, traditional sand milling equipment still faces many technical bottlenecks when processing solid electrolytes. For example, conventional sand milling equipment often adopts a single cylindrical structure and relies solely on external cooling to achieve low-temperature control, resulting in uneven temperature distribution and lack of material pre-screening. This not only easily leads to material agglomeration and deterioration of physical and chemical properties, but also forces large-diameter materials to be mixed with fine particles for simultaneous grinding, significantly increasing the load on subsequent grinding processes and reducing processing efficiency.

[0004] Meanwhile, traditional grinding mechanisms mostly adopt a fixed speed and spacing design, which makes it difficult to form targeted dynamic shear force and effectively break up particle agglomerates. In addition, low temperature control is mostly a single-point direct blowing mode, which can easily cause local temperature fluctuations and exacerbate the risk of electrolyte oxidation and decomposition.

[0005] Furthermore, the equipment has poor adaptability, making it difficult to meet the differentiated grinding process requirements of solid electrolytes with different particle sizes. In addition, the high integration of the grinding components makes subsequent cleaning and maintenance inconvenient, and the accumulation of residual materials can easily affect the processing accuracy and shorten the service life of the equipment.

[0006] To address this technical deficiency, a solution is proposed. Summary of the Invention

[0007] The purpose of this invention is to achieve stable transport and pre-screening of solid electrolyte materials for lithium batteries in the low-temperature range through a three-stage graded cylindrical structure and a closed-loop coolant circulation system. This effectively inhibits material agglomeration and deterioration of physicochemical properties, and significantly reduces the load on subsequent grinding processes. Furthermore, a low-temperature grinding mechanism is provided, relying on the coordinated rotation of the grinding roller and the cooling cylinder driven by magnetic repulsion to generate dynamic shear force to break up electrolyte particle agglomerates. The continuous low-temperature environment inhibits electrolyte oxidation and decomposition, while also adapting to the differentiated grinding process requirements of materials with different particle sizes, ensuring product performance stability.

[0008] The objective of this invention can be achieved through the following technical solution: a low-temperature sand milling device adapted to solid electrolyte materials for lithium batteries, including a sand milling frame, wherein a feeding cylinder cavity, a conveying cylinder cavity, and a grinding cylinder cavity are arranged sequentially along the transverse direction inside the sand milling frame, the conveying cylinder cavity and the grinding cylinder cavity are fixedly connected, and the feeding cylinder cavity and the conveying cylinder cavity are respectively connected to the inner wall of the sand milling frame through an externally sleeved annular bracket, and a low-temperature grinding mechanism is provided on the side of the grinding cylinder cavity away from the conveying cylinder cavity;

[0009] The feeding cylinder cavity is equipped with a dual-shaft motor on the side away from the feeding cylinder cavity, and the output shafts at both ends of the dual-shaft motor are respectively fixedly installed with a spiral conveying rod and a transmission wheel one. The end of the spiral conveying rod extends into the feeding cylinder cavity. A transmission wheel two is movably installed on one side of the transmission wheel one, and a shaft is fixedly installed at the center of the transmission wheel two. The shaft passes through the inside of the annular card seat and is fixedly installed with a limit gear.

[0010] The feeding cylinder cavity is provided with a jacketed channel, through which coolant circulates and is connected to an external coolant circulation system. A toothed ring frame is fixedly sleeved at the end of the feeding cylinder cavity away from the grinding cylinder cavity, and the toothed ring frame meshes with an adjacent limiting gear. A large-diameter fixing collar is fixedly installed on one side of the toothed ring frame, and the outer ring of the fixing collar is provided with annularly distributed wave grooves.

[0011] Furthermore, the bottom frame of the sand mill is a semi-circular structure, and a discharge groove is provided along the length of the bottom of the sand mill frame. A material-pulling rod is provided horizontally inside the discharge groove. The two ends of the material-pulling rod are respectively connected to the inner wall of the discharge groove. A movable collar is fixedly sleeved near the center of the rod. A movable pin is fixedly installed at the top center of the movable collar, and the top of the movable pin is adapted to slide in the wave groove.

[0012] Furthermore, there is a gap between the feed cylinder cavity and the feeding cylinder cavity, the outer diameter of the grinding cylinder cavity is larger than the outer diameter of the feeding cylinder cavity, and the inner wall of the grinding cylinder cavity near the end of the feeding cylinder cavity is set with an inclined surface, and the outer wall of the grinding cylinder cavity away from the end of the feeding cylinder cavity is set with a mesh structure.

[0013] Furthermore, the low-temperature grinding mechanism includes a side baffle frame movably sleeved on one side of the grinding cylinder cavity, and the end of the side baffle frame is slidably sleeved on the side frame of the sand mill outer frame. The side baffle frame is provided with a long groove near the grinding cylinder cavity, and the front and rear ends of the long groove are slidably connected to a double-axis slide cylinder. Each set of double-axis slide cylinders is movably and fixedly installed with a sliding plate at adjacent positions, and the sliding plate is adapted to slide within the long groove. A spring damping shock absorber is provided between the two sets of sliding plates. A cleaning long roller is fixedly installed at one end of the double-axis slide cylinder, and the front and rear sets of cleaning long rollers extend into the grinding cylinder cavity and contact the inner wall of the cavity.

[0014] Furthermore, a cooling cylinder and a grinding roller are movably installed on the side wall of the side baffle and at the upper and lower ends of the long groove, respectively. Several sets of exhaust ports are provided on the bottom surface of the cooling cylinder. The grinding roller and the cooling cylinder both extend into the grinding cylinder cavity, and the shafts and ventilation pipes of both at the ends away from the grinding cylinder cavity extend into the side baffle and are respectively equipped with servo motors and coolers.

[0015] Furthermore, a turntable is fixedly installed on the outside of the shaft of the grinding roller and the ventilation pipe of the cooling cylinder, and magnetic shafts are distributed circumferentially on the outer ring of one side of the turntable, with the magnetic shafts at the upper and lower sets of the turntable arranged in a magnetically repulsive manner.

[0016] Furthermore, the rear end face of the side guard frame is provided with a number of sets of transverse racks arranged longitudinally, and the rear end of the racks is engaged with a transverse toothed roller. A drive motor is provided between the end of the transverse toothed roller and the side wall of the sanding frame.

[0017] Furthermore, the front and rear inner walls of the side frame are provided with toothed groove groups, and the ends of each row of toothed groove groups are engaged with vertical toothed rollers. The tops of the two sets of vertical toothed rollers are respectively rotatably connected to the support plates installed on the side walls of the sanding frame. The top shaft of one set of vertical toothed rollers extends to the top of the support plate and is provided with a drive motor.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention features a three-section structure, with the feed cylinder, delivery cylinder, and grinding cylinder arranged horizontally inside the outer frame of the mill. Firstly, the spacing between the feed cylinder and delivery cylinder allows for the pre-screening of some fine particles, reducing the load on subsequent grinding processes. Secondly, the cooling liquid circulation system in the delivery cylinder's jacket ensures that the material remains stably at a low temperature during transport, preventing agglomeration or changes in physicochemical properties due to temperature increases. Simultaneously, the synchronous rotation of the delivery cylinder and grinding cylinder ensures uniform cooling of the material and promotes full contact between the material and the grinding media through centrifugal force, enhancing the thoroughness of grinding. Thirdly, the reciprocating oscillating structure of the material-pushing rod effectively breaks up material blockages at the discharge port, ensuring timely discharge of qualified particles and maintaining the continuity of the milling process.

[0020] 2. This invention also achieves multiple optimizations by setting up a low-temperature grinding mechanism: First, the low-speed rotation of the cooling cylinder, combined with the exhaust port design, ensures that the cold air evenly covers the surface of the grinding roller and the entire grinding cylinder cavity, avoiding material splashing caused by fixed-point direct blowing and effectively suppressing local high temperatures generated by grinding friction; Second, the cleaning roller moves in close contact with the inner wall of the grinding cylinder cavity, which can efficiently scrape off material residue and grinding media on the cavity wall; Third, by adjusting the distance between the grinding roller and the bottom of the grinding cylinder cavity, the grinding position can be optimized for lithium battery solid electrolyte materials of different particle sizes, improving grinding uniformity and expanding the applicability of the equipment. Attached Figure Description

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the sanding outer frame of the present invention;

[0024] Figure 3 This is a schematic diagram showing the combination of the feed cylinder cavity, the material delivery cylinder cavity, and the grinding cylinder cavity of the present invention;

[0025] Figure 4 This is a cross-sectional view of the sanding outer frame of the present invention;

[0026] Figure 5 This is a side half-sectional view of the outer frame of the sanding device of the present invention;

[0027] Figure 6 This is a schematic diagram of the low-temperature grinding mechanism of the present invention;

[0028] Figure 7 This is a partial structural schematic diagram of the low-temperature grinding mechanism of the present invention.

[0029] In the diagram: 1. Sand mill outer frame; 101. Feeding rod; 102. Movable collar; 103. Movable shaft pin; 2. Feed cylinder cavity; 201. Dual-axis motor; 202. Spiral conveyor rod; 203. Transmission wheel one; 204. Transmission wheel two; 205. Limiting gear; 3. Feeding cylinder cavity; 301. Toothed ring frame; 302. Fixed collar; 4. Grinding cylinder cavity; 5. Low-temperature grinding mechanism; 51. Side baffle frame; 52. Dual-axis slide cylinder; 521. Cleaning long roller; 53. Slide plate; 54. Spring damping shock absorber ring; 55. Cooling cylinder; 56. Grinding roller; 57. Servo motor; 58. Cooler; 59. Turntable; 591. Magnetic shaft; 510. Rack; 511. Horizontal toothed roller; 512. Drive motor two; 513. Vertical toothed roller; 514. Drive motor three. Detailed Implementation

[0030] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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.

[0031] Example 1: Please refer to Figure 1 - Figure 4As shown, a low-temperature sand milling device adapted to solid electrolyte materials for lithium batteries includes a sand milling frame 1. Inside the sand milling frame 1, a feed cylinder 2, a feeding cylinder 3, and a grinding cylinder 4 are arranged in sequence along the horizontal direction. The bottom frame of the sand milling frame 1 has a semi-circular structure, and a discharge trough is provided at the bottom of the sand milling frame 1 along the length direction. A material-pulling rod 101 is arranged horizontally inside the discharge trough. The two ends of the material-pulling rod 101 are respectively connected to the inner wall of the discharge trough. A movable collar 102 is fixedly sleeved near the center of the rod body. A movable shaft pin 103 is fixedly installed at the center of the top of the movable collar 102, and the top of the movable shaft pin 103 is adapted to slide in the corrugated groove.

[0032] The feeding cylinder cavity 3 is fixedly connected to the grinding cylinder cavity 4, and the feeding cylinder cavity 2 and the feeding cylinder cavity 3 are respectively connected to the inner wall of the sand mill outer frame 1 through an externally sleeved annular bracket. There is a gap between the feeding cylinder cavity 2 and the feeding cylinder cavity 3. The outer diameter of the grinding cylinder cavity 4 is larger than the outer diameter of the feeding cylinder cavity 3. The inner wall of the grinding cylinder cavity 4 near the end of the feeding cylinder cavity 3 is set with an inclined surface. The outer wall of the grinding cylinder cavity 4 and the end away from the feeding cylinder cavity 3 are set with a mesh structure. A low temperature grinding mechanism 5 is set on the side of the grinding cylinder cavity 4 away from the feeding cylinder cavity 3.

[0033] A dual-shaft motor 201 is provided on the side of the feeding cylinder cavity 2 away from the feeding cylinder cavity 3. The output shafts at both ends of the dual-shaft motor 201 are respectively fixedly installed with a spiral conveying rod 202 and a transmission wheel 203. The end of the spiral conveying rod 202 extends into the feeding cylinder cavity 3. A transmission wheel 204 is movably installed on one side of the transmission wheel 203. A shaft is fixedly installed at the center of the transmission wheel 204. The shaft passes through the inside of the annular card seat and is fixedly installed with a limit gear 205. A feed port is provided at the top of the feeding cylinder cavity 2.

[0034] The feeding cylinder cavity 3 is provided with a jacketed channel, through which coolant is circulated and connected to the external coolant circulation system, thereby achieving effective control of the internal temperature of the feeding cylinder cavity 3 and ensuring the stability of the grinding process in a low-temperature environment. A toothed ring frame 301 is fixedly sleeved at the end of the feeding cylinder cavity 3 away from the grinding cylinder cavity 4, and the toothed ring frame 301 meshes with the adjacent limiting gear 205. A large-diameter fixing collar 302 is fixedly installed on one side of the toothed ring frame 301, and the outer ring of the fixing collar 302 is provided with annularly distributed wave grooves.

[0035] Basic operating conditions: The solid electrolyte material of the lithium battery is put into the feeding cylinder 2 through the feed inlet. Then, the dual-shaft motor 201 is started, which drives the screw conveyor 202 and the transmission wheel 203 to rotate. The screw conveyor 202 conveys the material to the feeding cylinder 3. Because there is a gap between the feeding cylinder 2 and the feeding cylinder 3, some fine material particles are discharged through the gap first, and the remaining material continues to flow into the feeding cylinder 3. Cooling liquid of -10℃ to 5℃ is circulated in the interlayer channel of the feeding cylinder 3 to cool the material in the cavity, so that the material is conveyed to the grinding cylinder 4 in a low temperature environment. In addition, the inner wall of the cylinder opening of the grinding cylinder 4 near the feeding cylinder 3 is designed with a slope to facilitate the smooth entry of the material. When the low temperature grinding mechanism 5 grinds the material, fine particles that meet the particle size requirements can be discharged through the mesh structure, while particles that do not meet the requirements continue to be ground at low temperature in the cavity.

[0036] Meanwhile, transmission wheel 203 drives transmission wheel 204, shaft, and limiting gear 205 to rotate. Because the gear ring frame 301 meshes with the limiting gear 205, the gear ring frame 301 rotates accordingly, driving the fixed collar 302, feeding cylinder 3, and grinding cylinder 4 to rotate synchronously. The rotation of the feeding cylinder 3 and grinding cylinder 4 not only ensures uniform cooling of the material before grinding but also utilizes centrifugal force to ensure full contact between the material and the grinding medium within the grinding cylinder 4, improving grinding efficiency. Simultaneously, the wavy groove on the outer ring of the fixed collar 302 slides in conjunction with the movable shaft pin 103, causing the movable shaft pin 103 to drive the material-pushing rod 101 to reciprocate within the discharge groove, assisting in material discharge and preventing blockage at the discharge port, thus ensuring the smooth operation of the entire sand-grinding process.

[0037] Example 2: During the frictional contact between the grinding component and the material, both the material and the grinding component itself will experience localized high temperatures. The high temperature of the material will affect its physical and chemical properties, thereby affecting the grinding effect and the quality of the final product. At the same time, the grinding component is also prone to wear at high temperatures, reducing the service life of the equipment. In order to solve this problem, this example further optimizes the low-temperature grinding mechanism 5 based on Example 1.

[0038] Please see Figure 2 , Figure 5 - Figure 7As shown, the low-temperature grinding mechanism 5 includes a side baffle 51 that is movably sleeved on one side of the grinding cylinder cavity 4, and the end of the side baffle 51 is slidably sleeved on the side frame of the sand grinding outer frame 1. The side baffle 51 is provided with a long groove near the grinding cylinder cavity 4, and the front and rear ends of the long groove are slidably connected to a double-axis slide cylinder 52. Each set of double-axis slide cylinders 52 is movably and fixedly installed with a slide plate 53 at adjacent positions, and the slide plate 53 is adapted to slide and connect in the long groove. A spring damping shock absorber ring 54 is provided between the two sets of slide plates 53. A cleaning long roller 521 is fixedly installed at one end of the double-axis slide cylinder 52, and the front and rear sets of cleaning long rollers 521 extend into the interior of the grinding cylinder cavity 4 and contact the inner wall of the cavity.

[0039] A cooling cylinder 55 and a grinding roller 56 are movably installed on the side wall of the side frame 51 at the upper and lower ends of the long groove, respectively. Several sets of exhaust ports are provided on the bottom surface of the cooling cylinder 55. The grinding roller 56 and the cooling cylinder 55 both extend into the grinding cylinder cavity 4. The shafts and ventilation pipes of both, which are away from the grinding cylinder cavity 4, extend into the side frame 51 and are respectively equipped with a servo motor 57 and a cooler 58. Turntables 59 are fixedly installed on the outside of the shaft of the grinding roller 56 and the ventilation pipe of the cooling cylinder 55. Magnetic shafts 591 are distributed circumferentially on the outer ring of one side of the turntable 59. The magnetic shafts 591 at the upper and lower sets of turntables 59 are arranged in a magnetically repulsive manner.

[0040] The specific low-temperature grinding process is as follows: The material entering the grinding cylinder cavity 4 usually gathers on the inner wall at the bottom of the cavity. At this time, after the servo motor 57 and the cooler 58 are started, the grinding roller 56 and the cooling cylinder 55 operate synchronously. The grinding roller 56 mechanically grinds the lithium battery solid electrolyte material entering the grinding cylinder cavity 4 by high-speed rotation, breaking it into ultrafine particles.

[0041] The cooling cylinder 55 continuously blows the cold air generated by the cooler 58 into the surface of the grinding roller 56 and the grinding cylinder cavity 4 through the exhaust port via the ventilation pipe, so that the temperature inside the cavity is maintained at a low temperature. During operation, the two sets of turntables 59 are forced to rotate at a low speed by the magnetic repulsion of the magnetic shaft 591, which in turn drives the cooling cylinder 55 to rotate. In this way, when the cooling cylinder 55 rotates, its exhaust port can blow the cold air more evenly to the surface of the grinding roller 56 and all corners inside the grinding cylinder cavity 4, further ensuring the temperature of the entire grinding area is balanced, while avoiding the material from splashing randomly due to the fixed point of the exhaust port blowing directly.

[0042] In addition, during the grinding process, the two sets of cleaning rollers 521 move relative to each other along the inner wall of the rotating grinding cylinder 4, which can effectively scrape off the material particles and grinding media residues attached to the inner wall, preventing these residues from accumulating and affecting the grinding effect and normal operation of the equipment. Meanwhile, the sliding plate 53 slides in the long groove, and with the elasticity of the spring damping shock absorber ring 54, it can not only buffer the cleaning rollers 521 when they are subjected to greater resistance, avoiding hard collisions that could damage the equipment, but also make it easy to make adaptive adjustments to the position of the cleaning rollers 521.

[0043] This structure allows the grinding material to have reduced hardness and increased brittleness at low temperatures. Combined with the mechanical crushing of the grinding roller 56 and the cold air assistance of the cooling cylinder 55, it can significantly improve grinding efficiency and prevent the material from agglomerating or deteriorating due to high temperatures. The fine powder that has been ground is discharged through the mesh structure of the grinding cylinder cavity 4, while large particles continue to remain in the cavity to be ground until they meet the particle size requirements.

[0044] Example 3: As the material is continuously ground at low temperatures, its particle size is forced to decrease continuously. In order to adapt to the grinding requirements of materials with different particle sizes and further improve the grinding effect and equipment applicability, this example further improves the equipment structure based on Example 2.

[0045] Please see Figure 5 , Figure 6 As shown, several sets of transverse racks 510 are arranged longitudinally at the rear end of the side frame 51, and transverse toothed rollers 511 are engaged at the rear end of the racks 510. A second drive motor 512 is provided between the end of the transverse toothed rollers 511 and the side wall of the sanding frame 1. The front and rear inner walls of the side frame 51 are provided with toothed groove groups, and the end of each row of toothed groove groups is engaged with a vertical toothed roller 513. The tops of the two sets of vertical toothed rollers 513 are rotatably connected to the support plates installed on the side wall of the sanding frame 1. The top shaft of one set of vertical toothed rollers 513 extends to the top of the support plate and is provided with a third drive motor 514.

[0046] As the material is continuously crushed and the particles become finer, the drive motor 512 starts and drives the transverse toothed roller 511 to rotate. Because the transverse toothed roller 511 meshes with the rack 510, the side baffle 51 will reciprocate linearly in the horizontal or downward direction, thereby adjusting the height of the side baffle 51, the grinding roller 56, and the cooling cylinder 55. Initially, the distance between the grinding roller 56 and the bottom inner wall of the grinding cylinder 4 is relatively large; as the particle size of the material decreases, the distance between the grinding roller 56 and the bottom inner wall of the grinding cylinder 4 gradually shortens, and its contact position with the material inside the cylinder also changes continuously, thus enabling more comprehensive grinding of materials with different particle sizes.

[0047] After grinding is completed, drive motor 514 is started, which drives the vertical toothed roller 513 connected to it to rotate. Since the vertical toothed roller 513 meshes with the toothed groove group on the inner wall of the side baffle 51, the side baffle 51 will make a horizontal movement, moving away from the grinding cylinder cavity 4, until the side baffle 51 drives the grinding roller 56 and the cooling cylinder 55 to completely disengage from the grinding cylinder cavity 4. This design not only facilitates cleaning the inside of the grinding cylinder cavity 4, but also facilitates the maintenance or replacement of the grinding roller 56 and the cooling cylinder 55.

[0048] This adjustable design allows the equipment to flexibly adjust the contact distance and angle between the grinding roller 56 and the material according to the characteristics of different materials and grinding requirements, further optimizing the grinding process and improving the uniformity and efficiency of grinding. In addition, the movement of the side baffle 51 will also drive the position change of the cleaning roller 521, ensuring that the cleaning roller 521 can effectively scrape off the residue on the inner wall of the grinding cylinder 4 at different grinding stages, keeping the inside of the equipment clean and extending the service life of the equipment.

[0049] Working principle: When using this invention, the solid electrolyte material of lithium battery is first put into the feeding cylinder 2 through the feeding port. Then, the dual-shaft motor 201 is started, which drives the spiral conveyor 202 and the transmission wheel 203 to rotate. The spiral conveyor 202 conveys the material to the feeding cylinder 3. Some fine material particles are discharged first through the gap between the feeding cylinder 2 and the feeding cylinder 3. The remaining material enters the feeding cylinder 3. Cooling liquid of -10℃ to 5℃ is circulated in the jacket channel of the feeding cylinder 3 to cool the material and make it transported to the grinding cylinder 4 in a low temperature environment.

[0050] After entering the grinding cylinder 4, depending on the particle size of the material, if it is the initial grinding, the distance between the grinding roller 56 and the bottom inner wall of the grinding cylinder 4 is relatively far. As the particle size of the material decreases, the drive motor 512 is started, which drives the transverse toothed roller 511 to rotate. Through the rack 510, the side baffle 51 makes reciprocating linear motion in the horizontal direction. The height of the side baffle 51, the grinding roller 56 and the cooling cylinder 55 are adjusted so that the contact position between the grinding roller 56 and the material in the cylinder changes continuously, and materials of different particle sizes are ground in an all-round way. At the same time, the servo motor 57 and the cooler 58 are started. The grinding roller 56 rotates at high speed to mechanically grind the material. The cooling cylinder 55 blows cold air into the surface of the grinding roller 56 and the grinding cylinder 4 through the exhaust port to maintain the low temperature environment in the cavity. The two sets of turntables 59 rotate the cooling cylinder 55 by means of the magnetic repulsion of the magnetic shaft 591, so that the cold air is blown more evenly to all corners.

[0051] During the grinding process, two sets of cleaning rollers 521 move relative to each other along the inner wall of the rotating grinding cylinder 4, scraping off the material particles and grinding media residues attached to the inner wall. The slide plate 53 slides in the long groove, and together with the spring damping shock absorber ring 54, it plays the role of buffering and adjusting the position of the cleaning rollers 521. After grinding, the fine particles that meet the particle size requirements are discharged through the mesh structure of the grinding cylinder 4, while the particles that do not meet the requirements continue to remain in the cavity for grinding.

[0052] When it is necessary to clean the inside of the grinding cylinder cavity 4 or to maintain or replace the grinding roller 56 and the cooling cylinder 55, start the drive motor 514 to drive the vertical toothed roller 513 to rotate, so that the side baffle 51 moves horizontally and moves away from the grinding cylinder cavity 4 until the side baffle 51 drives the grinding roller 56 and the cooling cylinder 55 to completely detach from the grinding cylinder cavity 4.

[0053] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A low-temperature sand milling device adapted to solid electrolyte materials for lithium batteries, comprising a sand milling frame (1), characterized in that: The inner side of the sand mill frame (1) is arranged in a horizontal direction with a feeding cylinder cavity (2), a feeding cylinder cavity (3) and a grinding cylinder cavity (4). The feeding cylinder cavity (3) and the grinding cylinder cavity (4) are fixedly connected. The feeding cylinder cavity (2) and the feeding cylinder cavity (3) are respectively connected to the inner wall of the sand mill frame (1) through an externally sleeved annular bracket. A low-temperature grinding mechanism (5) is provided on the side of the grinding cylinder cavity (4) away from the feeding cylinder cavity (3). Among them, a dual-shaft motor (201) is provided on the side of the feed cylinder cavity (2) away from the feed cylinder cavity (3), and a spiral conveying rod (202) and a transmission wheel (203) are fixedly installed on the output shafts at both ends of the dual-shaft motor (201). The end of the spiral conveying rod (202) extends into the feed cylinder cavity (3). A transmission wheel (204) is movably installed on one side of the transmission wheel (203), and a shaft is fixedly installed at the center of the transmission wheel (204). The shaft passes through the inside of the annular card seat and a limit gear (205) is fixedly installed. The feeding cylinder cavity (3) is provided with a jacketed channel, in which coolant is circulated and connected to an external coolant circulation system. A toothed ring frame (301) is fixedly sleeved at the end of the feeding cylinder cavity (3) away from the grinding cylinder cavity (4), and the toothed ring frame (301) meshes with the adjacent limiting gear (205). A large-diameter fixing collar (302) is fixedly installed on one side of the toothed ring frame (301), and the outer ring of the fixing collar (302) is provided with annularly distributed wave grooves.

2. The low-temperature sand milling equipment adapted for lithium battery solid electrolyte materials according to claim 1, characterized in that, The bottom frame of the sand mill outer frame (1) is a semi-circular structure, and a discharge groove is provided at the bottom of the sand mill outer frame (1) along the length direction. A material-pulling rod (101) is arranged horizontally inside the discharge groove. The two ends of the material-pulling rod (101) are respectively connected to the inner wall of the discharge groove. A movable collar (102) is fixedly sleeved near the center of the rod body. A movable shaft pin (103) is fixedly installed at the top center of the movable collar (102), and the top of the movable shaft pin (103) is adapted to slide in the wave groove.

3. The low-temperature sand milling equipment adapted for lithium battery solid electrolyte materials according to claim 1, characterized in that, There is a gap between the feed cylinder cavity (2) and the feeding cylinder cavity (3). The outer diameter of the grinding cylinder cavity (4) is larger than the outer diameter of the feeding cylinder cavity (3). The inner wall of the grinding cylinder cavity (4) near the end of the feeding cylinder cavity (3) is set with an inclined surface. The outer wall of the grinding cylinder cavity (4) away from the end of the feeding cylinder cavity (3) is set with a mesh structure.

4. The low-temperature sand milling equipment adapted for lithium battery solid electrolyte materials according to claim 1, characterized in that, The low-temperature grinding mechanism (5) includes a side baffle (51) that is movably sleeved on one side of the grinding cylinder cavity (4), and the end of the side baffle (51) is slidably sleeved on the side frame of the sand grinding outer frame (1). The side baffle (51) is provided with a long groove near the grinding cylinder cavity (4), and the front and rear ends of the long groove are slidably connected with a double-axis slide cylinder (52). Each set of double-axis slide cylinders (52) is movably and fixedly installed with a slide plate (53) at adjacent positions, and the slide plate (53) is adapted to slide and connect in the long groove. A spring damping shock absorber (54) is provided between the two sets of slide plates (53). A cleaning long roller (521) is fixedly installed at one end of the double-axis slide cylinder (52), and the front and rear sets of cleaning long rollers (521) extend into the grinding cylinder cavity (4) and contact the inner wall of the cavity.

5. The low-temperature sand milling equipment adapted for lithium battery solid electrolyte materials according to claim 4, characterized in that, The side wall of the side frame (51) and the upper and lower ends of the long groove are respectively movably installed with a cooling cylinder (55) and a grinding roller (56). The bottom surface of the cooling cylinder (55) is provided with several sets of exhaust ports. The grinding roller (56) and the cooling cylinder (55) both extend into the grinding cylinder cavity (4). The shafts and ventilation pipes of both, which are away from the grinding cylinder cavity (4), extend into the side frame (51) and are respectively equipped with a servo motor (57) and a cooler (58).

6. The low-temperature sand milling equipment adapted for lithium battery solid electrolyte materials according to claim 5, characterized in that, Turntables (59) are fixedly installed on the shaft of the grinding roller (56) and the ventilation pipe of the cooling cylinder (55). Magnetic shafts (591) are distributed circumferentially on the outer ring of one side of the turntable (59). The magnetic shafts (591) at the upper and lower sets of the turntables (59) are arranged in a magnetically repulsive manner.

7. The low-temperature sand milling equipment adapted for lithium battery solid electrolyte materials according to claim 4, characterized in that, The rear end face of the side baffle (51) is provided with a number of horizontal racks (510) arranged longitudinally, and the rear end of the racks (510) is engaged with a transverse toothed roller (511). A second drive motor (512) is provided between the sanding outer frame (1) side wall at the end of the transverse toothed roller (511).

8. The low-temperature sand milling equipment adapted for lithium battery solid electrolyte materials according to claim 4, characterized in that, The front and rear inner walls of the side frame (51) are provided with toothed groove groups, and the ends of each row of toothed groove groups are engaged with vertical toothed rollers (513). The tops of the two sets of vertical toothed rollers (513) are respectively rotatably connected to the support plate installed on the side wall of the sanding frame (1). The top shaft of one set of vertical toothed rollers (513) extends to the top of the support plate and is provided with a drive motor three (514).

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