Roller crusher

Abstract

The application discloses a pair of roller crushers, and the pair of roller crushers comprises a box body, a first roller, a second roller, a first rotating shaft and a second rotating shaft. An upper end surface of the box body is provided with a feeding port, the first roller and the second roller are movably arranged in the box body, the first roller and the second roller are arranged in meshing or spacing in a first direction in a horizontal plane to form a material crushing area, the material crushing area is arranged opposite to the feeding port in the up-down direction, the first rotating shaft is arranged between the first roller and a top wall of the box body and extends along the axial direction of the first roller, and the second rotating shaft is arranged between the second roller and the top wall of the box body and extends along the axial direction of the second roller. According to the pair of roller crushers, the uniformity of the crushed material can be improved, the material blockage can be avoided to cause abrasion or shutdown, the operation stability is high, the efficiency of processing the material is high, the maintenance working hours can be reduced, and the cost can be reduced.

Description

Technical Field

[0001] This invention relates to the field of crusher technology, and in particular to a double roll crusher. Background Technology

[0002] In related technologies, a double roll crusher has two relatively rotating rollers. To avoid friction caused by contact between the rollers and the casing, a gap is provided between the two rollers and the top wall of the casing. When the double roll crusher crushes materials, some material debris splashes into the gap between the two rollers and the top wall of the casing, gradually clogging the gap. This increases the friction between the rotating rollers, eventually preventing them from rotating and causing material blockage. It can even overload the motor driving the rollers, leading to a trip and the entire double roll crusher shutting down, severely impacting its operating efficiency.

[0003] Even if the double-roll crusher does not trip due to blockage, uneven crushing can still occur because large particles may enter the gap between the rollers and the top wall of the crusher without being fully crushed. This results in uncontrollable particle size distribution, especially in the lithium-ion battery field, where the particle size of the cathode material is a key factor affecting its electrochemical performance. Particle size not only affects the material's specific surface area, ion diffusion rate, and electron transport efficiency, but also influences the reaction kinetics and capacity decay behavior during charge and discharge. An ideal particle size distribution can optimize the energy capacity and cycle isoelectric performance of lithium batteries. Therefore, the particle size distribution of cathode materials is crucial both in the R&D and mass production stages. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a double roll crusher, which can improve the uniformity of crushed materials, avoid material blockage leading to wear or downtime, has high operational stability and high material processing efficiency, and can also reduce maintenance time and lower costs.

[0005] According to an embodiment of the present invention, a double-roll crusher includes: a housing, a first roller, a second roller, a first rotating shaft, and a second rotating shaft. The upper end face of the housing is provided with a feeding port. The first roller and the second roller are rotatably disposed within the housing, and the first roller and the second roller are meshed or spaced apart in a first direction in a horizontal plane to form a material crushing zone. The material crushing zone and the feeding port are arranged opposite each other in a vertical direction, wherein the first direction, the axial direction of the first roller / second roller, and the vertical direction are mutually perpendicular. The first rotating shaft is disposed between the first roller and the top wall of the housing, and extends along the axial direction of the first roller. The second rotating shaft is disposed between the second roller and the top wall of the housing, and extends along the axial direction of the second roller. The first rotating shaft and the second rotating shaft are respectively disposed on both sides of the feeding port in the first direction.

[0006] According to an embodiment of the present invention, the double roll crusher, by providing a first rotating shaft extending along the axial direction of the first roller between the first roller and the top wall of the housing, and providing a second rotating shaft extending along the axial direction of the second roller between the second roller and the top wall of the housing, can prevent some material from entering the gap between the first roller and the second roller and the top wall of the housing. This can prevent non-standard large particles from slipping out, improve the uniformity of the crushed material, and also prevent the double roll crusher from being blocked by material, thus avoiding wear or shutdown. It can improve the operational stability of the double roll crusher and extend the stable operating time, thereby improving the material processing efficiency, reducing maintenance time, and lowering costs.

[0007] According to some embodiments of the present invention, the first rotating shaft and the second rotating shaft are rotatably disposed in the housing, the rotation axis of the first rotating shaft and the rotation axis of the first roller are parallel to each other, and the rotation axis of the second rotating shaft and the rotation axis of the second roller are parallel to each other.

[0008] In some embodiments of the present invention, the first rotating shaft and the first roller rotate in opposite directions, and the second rotating shaft and the second roller rotate in opposite directions.

[0009] In some embodiments of the present invention, the first roller and the second roller mesh, the first rotating shaft meshes with the first roller, and the second rotating shaft meshes with the second roller.

[0010] In some embodiments of the present invention, the double roll crusher further includes a drive device for driving at least one of the first roll, the second roll, the first shaft, and the second shaft to rotate.

[0011] In some embodiments of the present invention, the first roller, the second roller, the first shaft, and the second shaft are metal parts.

[0012] In some embodiments of the present invention, the first roller and the second roller are spaced apart, the first rotating shaft is spaced apart from the first roller, and the second rotating shaft is spaced apart from the second roller. In this application, a spaced-apart arrangement is preferred. In the field of cathode materials, if meshing crushing is used, over-crushing can occur, resulting in a high proportion of fine powder, a large specific surface area, and a low tap density. This powder generally cannot be sold as a finished product and can only be recycled as waste. Furthermore, it may affect the structural stability of the cathode material particles, causing phenomena such as intergranular cracks and reducing the electrical performance of the cathode material.

[0013] In some embodiments of the present invention, the double roll crusher further includes a drive assembly, wherein there are two drive assemblies, one of which is used to simultaneously drive the first roller and the second shaft to rotate, and the other drive assembly is used to simultaneously drive the second roller and the first shaft to rotate.

[0014] Furthermore, the two drive components rotate at the same speed but drive in opposite directions.

[0015] In some embodiments of the present invention, each of the drive components includes a transmission element and a drive element. There are two transmission elements, which are respectively connected to the first roller and the second rotating shaft, or the two transmission elements are respectively connected to the second roller and the first rotating shaft. There is one drive element for simultaneously driving the two transmission elements.

[0016] In some embodiments of the present invention, the minimum gap between the first roller and the second roller is 'a', and satisfies: 1mm ≤ a ≤ 2mm. In the field of lithium-ion cathode materials, semi-finished products from high-temperature sintering generally need to be pulverized and graded to meet product standards. Different cathode materials have different sintering temperatures. Some materials, due to their high sintering temperatures, exhibit severe agglomeration and require different levels of pulverization. If the pulverized material is too coarse, it hinders the uniform distribution of elements during subsequent sintering; if it is too fine, it affects the electrical performance of the finished cathode material.

[0017] In some embodiments of the present invention, the minimum gap between the first rotating shaft and the first roller is equal to the minimum gap between the first roller and the second roller; and / or, the minimum gap between the second rotating shaft and the second roller is equal to the minimum gap between the first roller and the second roller.

[0018] In some embodiments of the present invention, the first roller, the second roller, the first shaft, and the second shaft are ceramic components. In the field of lithium-ion battery cathode materials, the requirements for the content of metallic foreign matter are extremely strict; for example, the molar content of elemental iron is required to be less than 3 × 10⁻⁶. -8 In this application, the first roller, the second roller, the first shaft, and the second shaft are all made of ceramic parts, which can prevent contamination by metal impurities.

[0019] In some embodiments of the present invention, the inner wall of the box is provided with an inner lining coating, wherein the copper content of the inner lining coating is less than or equal to 0.5% and the zinc content of the inner lining coating is less than or equal to 1%. When the above coating is provided and the conditions are met, it can avoid the introduction of metal elements such as copper and zinc into the material during the crushing process, thus preventing contamination of the material.

[0020] In some embodiments of the present invention, the double-roll crusher further includes a rotary bearing, wherein the rotary bearing is provided between the first rotating shaft and the housing, and the rotary bearing is provided between the second rotating shaft and the housing.

[0021] According to some embodiments of the present invention, the minimum gap between the first rotating shaft and the top wall of the housing is b, and satisfies: 1mm ≤ b ≤ 2mm; and / or, the minimum gap between the second rotating shaft and the top wall of the housing is b, and satisfies: 1mm ≤ b ≤ 2mm. When the above conditions are met, the particle size distribution is uniform and the particle size is relatively uniform and controllable when the positive electrode material is crushed in the housing, thereby improving the electrical performance of the positive electrode material.

[0022] According to some embodiments of the present invention, the double roll crusher further includes a support bearing, wherein the support bearing is provided between the first roll and the housing, and between the second roll and the housing.

[0023] In some embodiments of the present invention, the double roll crusher further includes two base springs, which are respectively located on the side of the first roll and the second roll away from each other. One end of the two base springs is connected to the housing, and the other end of the two base springs is connected to the support bearing of the first roll and the support bearing of the second roll, respectively. The two base springs are used to drive the first roll and the second roll to move toward each other.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a perspective view of a double-roll crusher according to an embodiment of the present invention;

[0027] Figure 2 This is a top view of a double-roll crusher according to an embodiment of the present invention;

[0028] Figure 3 This is a side view of a double-roll crusher according to an embodiment of the present invention;

[0029] Figure 4 This is a cross-sectional view of a double-roll crusher according to an embodiment of the present invention.

[0030] Figure label:

[0031] 100. Double roll crusher;

[0032] 1. Box body; 11. Feed inlet; 12. Crushing chamber; 13. Discharge outlet; 14. Material crushing zone;

[0033] 2. First roller;

[0034] 3. Second roller;

[0035] 4. First rotating shaft;

[0036] 5. Second rotating shaft;

[0037] 6. Drive unit; 61. First motor; 62. Second motor;

[0038] 7. Drive components; 71. Transmission components; 72. Drive components;

[0039] 8. Support bearing;

[0040] 9. Base spring. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] The following is for reference. Figures 1-4 A double roll crusher 100 according to an embodiment of the present invention is described.

[0045] like Figure 1 and Figure 2 As shown, the double roll crusher 100 according to an embodiment of the present invention includes a housing 1, a first roller 2, a second roller 3, a first rotating shaft 4, and a second rotating shaft 5.

[0046] Specifically, such as Figures 1-3 As shown, the upper end face of the box 1 is provided with a feeding port 11. The first roller 2 and the second roller 3 are rotatably disposed inside the box 1. The first roller 2 and the second roller 3 are meshed or spaced apart in the first direction in the horizontal plane to form a material crushing zone 14. The material crushing zone 14 and the feeding port 11 are arranged opposite each other in the vertical direction. The first direction, the axial direction of the first roller 2 and the vertical direction are perpendicular to each other.

[0047] Please see Figure 2It is understood that the housing 1 contains a crushing chamber 12, with a first roller 2 and a second roller 3 located within the crushing chamber 12. A feeding port 11 is located at the top of the housing 1 and communicates with the crushing chamber 12, used to feed the material to be crushed into the crushing chamber 12. The rotation axes of the first roller 2 and the second roller 3 are spaced apart and parallel to each other in a first direction in the horizontal plane. The feeding port 11 is positioned opposite to the material crushing zone 14 formed by the spacing or meshing of the first roller 2 and the second roller 3. Thus, the material to be crushed can fall from the feeding port 11 between the first roller 2 and the second roller 3. Simultaneously, the first roller 2 and the second roller 3 rotate relative to each other, with the ends closest to each other rotating downwards, thereby drawing the material between the first roller 2 and the second roller 3. The material is subjected to strong compression and shearing action and is crushed. A discharge port 13 can be provided at the lower end of the housing 1, allowing the crushed material to fall naturally and exit the crushing chamber 12 from the discharge port 13.

[0048] Furthermore, the first rotating shaft 4 is disposed between the first roller 2 and the top wall of the housing 1, and extends along the axial direction of the first roller 2. The second rotating shaft 5 is disposed between the second roller 3 and the top wall of the housing 1, and extends along the axial direction of the second roller 3. The first rotating shaft 4 and the second rotating shaft 5 are respectively disposed on both sides of the feeding port 11 in the first direction.

[0049] In existing technology, to avoid friction caused by contact between the first and second rollers and the housing, gaps are provided between the first and second rollers and the top wall of the housing, as well as the side walls along the first direction. When material is rolled into the space between the first and second rollers for crushing, some material debris splashes into the gaps between the first and second rollers and the top wall of the housing. This causes large, non-standard crushed material debris to fall from the sides of the first and second rollers away from each other and be discharged from the discharge port of the crushing chamber. In addition, some material debris tends to accumulate in the gaps between the first and second rollers and the top wall of the housing. Over time, these gaps gradually become blocked, increasing the friction of the rotation of the first and second rollers. Eventually, this can prevent the first and second rollers from rotating, causing a blockage. This can even lead to overload of the motor driving the first and second rollers, resulting in a trip and the shutdown of the entire double-roll crusher.

[0050] In this application, by setting the first rotating shaft 4 and the second rotating shaft 5, some material debris can be prevented from splashing into the gap between the first roller 2 and the second roller 3 and the top wall of the housing 1. This prevents large pieces of non-standard material from being discharged from the discharge port 13, improving the uniformity of the crushed material and thus improving the precision and quality of the material processed by the double roll crusher 100. It also prevents the gap between the first roller 2 and the second roller 3 and the top wall of the housing 1 from becoming clogged and causing wear, thereby preventing the double roll crusher 100 from clogging and stopping operation. This improves the operational stability of the double roll crusher 100 and extends the stable operating time, thereby reducing the number of maintenance operations and maintenance time, which in turn improves the material processing efficiency of the double roll crusher 100 and reduces the maintenance and operating costs of the double roll crusher 100.

[0051] According to an embodiment of the present invention, the double roll crusher 100, by providing a first rotating shaft 4 extending along the axial direction of the first roller 2 between the first roller 2 and the top wall of the housing 1, and providing a second rotating shaft 5 extending along the axial direction of the second roller 3 between the second roller 3 and the top wall of the housing 1, can prevent some material from entering the gap between the first roller 2, the second roller 3 and the top wall of the housing 1, thereby preventing non-standard large particles from slipping out, improving the uniformity of crushed material, and preventing the double roll crusher 100 from being blocked by material, thus preventing wear or shutdown. It can improve the operational stability of the double roll crusher 100 and extend the stable operating time, thereby improving the material processing efficiency, reducing maintenance time and lowering costs.

[0052] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the first rotating shaft 4 and the second rotating shaft 5 are rotatably mounted inside the housing 1. The rotation axis of the first rotating shaft 4 is parallel to the rotation axis of the first roller 2, and the rotation axis of the second rotating shaft 5 is parallel to the rotation axis of the second roller 3. When some material debris splashes into the gap between the first roller 2 and the second roller 3 and the top wall of the housing 1, the rotating first rotating shaft 4 and the second rotating shaft 5 can drive the material debris back between the first roller 2 and the second roller 3. This can effectively improve the effect of blocking material debris, thereby avoiding material blockage and shutdown of the double roll crusher 100. It can better improve the operational stability of the double roll crusher 100, thereby improving the material processing efficiency, reducing maintenance time, and lowering costs.

[0053] In some embodiments of the present invention, the first rotating shaft 4 and the first roller 2 rotate in opposite directions, and the second rotating shaft 5 and the second roller 3 rotate in opposite directions. When some material debris splashes into the gap between the first roller 2 and the second roller 3 and the top wall of the housing 1, the rotation directions of the first rotating shaft 4 and the second rotating shaft 5 can drive the material debris back between the first roller 2 and the second roller 3. The structure is reasonably designed and can effectively improve the effect of preventing material debris from entering the gap between the first roller 2 and the second roller 3 and the top wall of the housing 1, thereby avoiding material blockage and shutdown of the double roll crusher 100 and improving the operational stability of the double roll crusher 100.

[0054] At the same time, the first rotating shaft 4 and the first roller 2 rotate relative to each other, which can roll the material debris splashed into the gap between the first roller 2 and the top wall of the box 1 into the space between the first rotating shaft 4 and the first roller 2. The material is crushed by strong compression and shearing action, and then falls naturally from the side of the first roller 2 away from the second roller 3 and is discharged from the crushing chamber 12 through the discharge port 13. This can prevent non-standard materials from being discharged from the discharge port 13, thereby improving the precision and quality of the materials processed by the double roll crusher 100.

[0055] Similarly, the relative rotation of the second rotating shaft 5 and the second roller 3 can entrain material debris splashed into the gap between the second roller 3 and the top wall of the box 1 into the space between the second rotating shaft 5 and the second roller 3. The material is crushed by strong compression and shearing action, and then falls naturally from the side of the second roller 3 away from the first roller 2 and is discharged from the crushing chamber 12 through the discharge port 13. This can prevent non-standard materials from being discharged from the discharge port 13, thereby improving the precision and quality of the materials processed by the double roll crusher 100.

[0056] In some embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the first roller 2 and the second roller 3 mesh, the first rotating shaft 4 meshes with the first roller 2, and the second rotating shaft 5 meshes with the second roller 3. The meshing of the first roller 2 and the second roller 3 allows them to rotate in opposite directions. Therefore, when the material to be crushed falls from the feed inlet 11 between the first roller 2 and the second roller 3, it is subjected to strong compression and shearing forces and is thus crushed, ensuring the precision and quality of the crushed material by the roller crusher 100.

[0057] The first rotating shaft 4 meshes with the first roller 2, and the second rotating shaft 5 meshes with the second roller 3. When the first roller 2 and the second roller 3 rotate in opposite directions, the first rotating shaft 4 can be driven to rotate in the opposite direction to the first roller 2, and the second rotating shaft 5 can be driven to rotate in the opposite direction to the second roller 3. This allows the splashed material debris to be driven back between the first roller 2 and the second roller 3. The structure is reasonably designed and easy to implement.

[0058] Furthermore, the meshing first rotating shaft 4 and the first roller 2 can further squeeze and crush the material debris splashed into the gap between the first roller 2 and the top wall of the box 1, and the meshing second rotating shaft 5 and the second roller 3 can further squeeze and crush the material debris splashed into the gap between the second roller 3 and the top wall of the box 1. This can prevent non-standard materials from being discharged from the discharge port 13, thereby improving the precision and quality of the crushed materials by the double roll crusher 100.

[0059] In some embodiments of the present invention, such as Figures 1-3 As shown, the double-roll crusher 100 also includes a drive device 6, which drives at least one of the first roller 2, the second roller 3, the first rotating shaft 4, and the second rotating shaft 5 to rotate. Specifically, the drive device 6 can be a drive motor. The output shaft of the drive device 6 is connected to at least one of the first roller 2, the second roller 3, the first rotating shaft 4, and the second rotating shaft 5. The output shaft can output torque, thereby driving the first roller 2, the second roller 3, the first rotating shaft 4, and the second rotating shaft 5 to rotate together. Specifically, the first roller 2 and the second roller 3 rotate in opposite directions, the first rotating shaft 4 rotates in the opposite direction to the first roller 2, and the second rotating shaft 5 rotates in the opposite direction to the second roller 3.

[0060] For example, such as Figure 1 and Figure 2 As shown in the example, the drive device 6 includes a first motor 61 and a second motor 62. The output shaft of the first motor 61 is connected to the first roller 2 to drive the first roller 2 to rotate. The output shaft of the second motor 62 is connected to the second roller 3 to drive the second roller 3 to rotate in the opposite direction to the first roller 2. This can improve the stability and reliability of the first roller 2 and the second roller 3 rotating together, and ensure the shearing force between the first roller 2 and the second roller 3, thereby improving the quality of the crushed material by the double roll crusher 100.

[0061] The first roller 2 can drive the first rotating shaft 4 to rotate in the opposite direction to the first roller 2, and the second roller 3 can drive the second rotating shaft 5 to rotate in the opposite direction to the second roller 3. The first rotating shaft 4 and the second rotating shaft 5 do not need to be equipped with separate drive devices 6, which can save costs.

[0062] In some embodiments of the present invention, the first roller 2, the second roller 3, the first shaft 4, and the second shaft 5 are metal parts. Metal parts have high structural strength and wear resistance, which can extend the service life of the double-roll crusher 100. Furthermore, it is easy to machine mutually meshing teeth on the surfaces of the first roller 2, the second roller 3, the first shaft 4, and the second shaft 5, thereby achieving a meshing connection and thus a transmission effect. Specifically, the first roller 2, the second roller 3, the first shaft 4, and the second shaft 5 can be metal plum blossom rollers or gear rollers, suitable for the sand and gravel industry.

[0063] In some embodiments of the present invention, such as Figure 4 As shown, the first roller 2 and the second roller 3 are spaced apart, the first rotating shaft 4 is spaced apart from the first roller 2, and the second rotating shaft 5 is spaced apart from the second roller 3. This avoids the first roller 2, the second roller 3, the first rotating shaft 4, and the second rotating shaft 5 from contacting each other during rotation and causing wear, thus preventing debris from being mixed into the crushed material and improving the precision and quality of the material processed by the double roller crusher 100.

[0064] In this application, the first roller 2 and the second roller 3 are preferably arranged alternately. In the field of cathode materials, if the first roller and the second roller are meshed, breakage will occur, resulting in a high proportion of micro powder, a large specific surface area, and a low tap density. Generally, it cannot be sold as a finished product and can only be recycled as waste. Furthermore, it may affect the structural stability of cathode material particles, causing phenomena such as intergranular cracks and reducing the electrical performance of cathode materials.

[0065] In some embodiments of the present invention, such as Figure 4 As shown, the double roll crusher 100 also includes a drive assembly 7, which consists of two drive assemblies. One drive assembly 7 is used to simultaneously drive the first roller 2 and the second rotating shaft 5 to rotate, and the other drive assembly 7 is used to simultaneously drive the second roller 3 and the first rotating shaft 4 to rotate.

[0066] Since the first roller 2 and the second roller 3 rotate in opposite directions, and the second roller 3 and the second shaft 5 rotate in opposite directions, the first roller 2 and the second shaft 5 rotate in the same direction. Similarly, the second roller 3 and the first shaft 4 rotate in the same direction. Therefore, the first roller 2 and the second shaft 5 can be driven to rotate by the same drive assembly 7, and the second roller 3 and the first shaft 4 can also be driven to rotate by the same drive assembly 7. This reduces the number of drive assemblies 7 required, thus saving costs.

[0067] The first roller 2 and the second rotating shaft 5 are connected to the output shaft of the same drive assembly 7, so that the drive assembly 7 can simultaneously drive the first roller 2 and the second rotating shaft 5 to rotate in the same direction. The second roller 3 and the first rotating shaft 4 are connected to the output shaft of another drive assembly 7, so that the other drive assembly 7 can simultaneously drive the second roller 3 and the first rotating shaft 4 to rotate in the same direction.

[0068] Furthermore, the two drive components 7 rotate at the same speed but in opposite directions. Thus, the two drive components 7 can respectively drive the first roller 2 and the second roller 3 to rotate at the same speed and in opposite directions, simultaneously driving the first roller 2 and the first rotating shaft 4 to rotate at the same speed and in opposite directions, and driving the second roller 3 and the second rotating shaft 5 to rotate at the same speed and in opposite directions. This allows for the uniform compression and crushing of materials between the first roller 2 and the second roller 3, between the first roller 2 and the first rotating shaft 4, and between the second roller 3 and the second rotating shaft 5.

[0069] In some embodiments of the present invention, such as Figure 4 As shown, each drive assembly 7 includes a transmission component 71 and a drive component 72. There are two transmission components 71, which are respectively connected to the first roller 2 and the second rotating shaft 5, or the two transmission components 71 are respectively connected to the second roller 3 and the first rotating shaft 4. There is one drive component 72, which is used to drive the two transmission components 71 simultaneously.

[0070] It is understood that the transmission component 71 can specifically be a transmission belt. Two transmission components 71 are connected to the first roller 2 and the second shaft 5, or to the second roller 3 and the first shaft 4, respectively. Both transmission belts are connected to the output shaft of the same drive component 72. The output shaft of the drive component 72 can output torque, driving the two transmission belts to rotate in the same direction. Thus, the first roller 2 and the second shaft 5 can be driven to rotate in the same direction via the transmission component 71, or the second roller 3 and the first shaft 4 can be driven to rotate in the same direction via the transmission component 71. The structure is simple and easy to implement, with high transmission stability. Only one drive component 72 is needed in each drive assembly 7, saving the number of drive components 72 and thus reducing costs.

[0071] In some embodiments of the present invention, the minimum gap between the first roller 2 and the second roller 3 is 'a', satisfying the condition: 1mm ≤ a ≤ 2mm. If a > 2mm, the gap between the first roller 2 and the second roller 3 is too large, reducing the compressive and shear forces on the material as it passes through the gap, resulting in insufficient crushing, producing more coarse particles, uneven particle size, and reduced crushing quality. It also causes material to slide between the first roller 2 and the second roller 3, reducing crushing efficiency. If a < 1mm, the gap between the first roller 2 and the second roller 3 is too small, requiring more energy for over-crushing, increasing equipment energy consumption, and increasing friction between the surfaces of the first roller 2 and the second roller 3 and the material, accelerating wear and shortening the service life of the double-roll crusher 100.

[0072] In the field of lithium-ion cathode materials, semi-finished products that have undergone high-temperature sintering generally need to be crushed and graded to meet product standards. Different cathode materials have different sintering temperatures. Some materials have more severe agglomeration due to their higher sintering temperatures, so they need to be crushed at different levels. If the crushed material is too coarse, it will not be conducive to the uniform distribution of elements in subsequent sintering. If it is too fine, it will affect the electrical performance of the finished cathode material.

[0073] Therefore, by ensuring that 1mm≤a≤2mm and the gap between the first roller 2 and the second roller 3 is moderate, it can not only guarantee the crushing effect and improve the uniformity of the particle size of the crushed material, thereby improving the crushing quality and crushing efficiency, but also avoid aggravating energy consumption and reducing wear, thus helping to extend the service life of the double roll crusher 100.

[0074] In some embodiments of the present invention, such as Figure 4 As shown, the minimum gap between the first rotating shaft 4 and the first roller 2 is equal to the minimum gap between the first roller 2 and the second roller 3. Material debris splashed into the gap between the first roller 2 and the top wall of the housing 1 will be drawn into the space between the first rotating shaft 4 and the first roller 2, causing the material to be crushed by strong compression and shearing. This ensures that the particle size of the material crushed by the first rotating shaft 4 and the first roller 2 is consistent with the particle size of the material crushed by the first roller 2 and the second roller 3, thereby improving the uniformity of the crushed material and thus improving the precision and quality of the material processed by the double roll crusher 100.

[0075] In some embodiments of the present invention, such as Figure 4 As shown, the minimum gap between the second rotating shaft 5 and the second roller 3 is equal to the minimum gap between the first roller 2 and the second roller 3. Material debris splashed into the gap between the second roller 3 and the top wall of the housing 1 will be rolled into the space between the second rotating shaft 5 and the second roller 3, causing the material to be crushed by strong compression and shearing. This ensures that the particle size of the material crushed by the second rotating shaft 5 and the second roller 3 is consistent with the particle size of the material crushed by the first roller 2 and the second roller 3, thereby improving the uniformity of the crushed material and thus improving the precision and quality of the material processed by the double roll crusher 100.

[0076] In some embodiments of the present invention, the first roller 2, the second roller 3, the first shaft 4, and the second shaft 5 are ceramic components. Ceramic components possess extremely high hardness and wear resistance, enabling them to withstand high-intensity friction and wear, thus extending the service life of the first roller 2, the second roller 3, the first shaft 4, and the second shaft 5, and reducing replacement frequency and maintenance costs. Therefore, during the operation of the double-roll crusher 100, the ceramic components, in contact with the material, can effectively suppress the generation of metallic foreign matter, thereby ensuring the purity of the crushed product and improving the quality of the material crushed by the double-roll crusher 100. This makes it suitable for industries with high purity requirements, such as the lithium battery industry.

[0077] In the field of lithium-ion battery cathode materials, the requirements for the content of metallic foreign matter are extremely strict. For example, the molar content of elemental iron is required to be less than 3 × 10⁻⁶. -8 In this application, the first roller 2, the second roller 3, the first shaft 4 and the second shaft 5 are all made of ceramic parts, which can prevent contamination by metal impurities.

[0078] In some embodiments of the present invention, the inner wall of the housing 1 is provided with an inner lining coating, wherein the copper content of the inner lining coating is less than or equal to 0.5%, and the zinc content of the inner lining coating is less than or equal to 1%. When materials are crushed, splashing occurs. Providing an inner lining coating on the inner wall of the housing 1 can prevent material from splashing onto the inner wall of the housing 1 and generating metal fragments, thereby ensuring the purity of the crushed product and improving the quality of the crushed material by the double roll crusher 100. This is suitable for industries with high purity requirements, such as the lithium battery industry. When the above coating is provided and the conditions are met, it can prevent the introduction of metal elements such as copper and zinc into the material during the crushing process, thus avoiding contamination.

[0079] In some embodiments of the present invention, the double roll crusher 100 further includes rotary bearings. A rotary bearing is provided between the first rotating shaft 4 and the housing 1, and a rotary bearing is provided between the second rotating shaft 5 and the housing 1. The rotary bearings provide stable support and fixation for the first rotating shaft 4 and the second rotating shaft 5, ensuring that the first rotating shaft 4 and the second rotating shaft 5 maintain the correct position and orientation during operation. Simultaneously, the rotary bearings allow the first rotating shaft 4 and the second rotating shaft 5 to rotate under low-friction conditions, reducing direct contact between the first rotating shaft 4 and the second rotating shaft 5 and the housing 1, thereby reducing wear and extending the service life of the double roll crusher 100.

[0080] In some embodiments of the present invention, the minimum gap between the first rotating shaft 4 and the top wall of the housing 1 is b, and satisfies: 1mm ≤ b ≤ 2mm. If b > 2mm, the gap between the first rotating shaft 4 and the top wall of the housing 1 is too large, which may cause some material debris to splash into the gap between the first rotating shaft 4 and the top wall of the housing 1 and block the gap, resulting in material blockage, which will cause wear or stoppage of the first rotating shaft 4. If b < 1mm, the gap between the first rotating shaft 4 and the top wall of the housing 1 is too small, and the first rotating shaft 4 is prone to friction with the housing 1, affecting the service life of the first rotating shaft 4.

[0081] Therefore, ensuring that 1mm ≤ b ≤ 2mm avoids friction between the first rotating shaft 4 and the housing 1, thus guaranteeing the service life of the first rotating shaft 4, and also prevents material blockage between the first rotating shaft 4 and the housing 1. This improves the operational stability of the first rotating shaft 4 and extends its stable operating time, thereby reducing the number of maintenance operations and maintenance time, and ultimately improving the operating efficiency of the double-roll crusher 100. When the above conditions are met, the particle size distribution of the positive electrode material is uniform and the particle size is relatively uniform and controllable during crushing within the housing, thereby improving the electrical performance of the positive electrode material.

[0082] In some embodiments of the present invention, the minimum gap between the second rotating shaft 5 and the top wall of the housing 1 is b, and satisfies: 1mm ≤ b ≤ 2mm. If b > 2mm, the gap between the second rotating shaft 5 and the top wall of the housing 1 is too large, which may cause some material debris to splash into the gap between the second rotating shaft 5 and the top wall of the housing 1 and block the gap, resulting in material blockage, which will cause wear or stoppage of the second rotating shaft 5. If b < 1mm, the gap between the second rotating shaft 5 and the top wall of the housing 1 is too small, and the second rotating shaft 5 is prone to friction with the housing 1, affecting the service life of the second rotating shaft 5.

[0083] Therefore, ensuring that 1mm≤b≤2mm can prevent friction between the second rotating shaft 5 and the housing 1, thus guaranteeing the service life of the second rotating shaft 5, and also prevent material blockage between the second rotating shaft 5 and the housing 1. This can improve the operational stability of the second rotating shaft 5 and extend the stable operation time, thereby reducing the number of maintenance times and maintenance hours, and ultimately improving the operating efficiency of the double roll crusher 100.

[0084] In some embodiments of the present invention, such as Figure 4 As shown, the double roll crusher 100 also includes support bearings 8. Support bearings 8 are provided between the first roller 2 and the housing 1, and between the second roller 3 and the housing 1. The support bearings 8 provide stable support and fixation for the first roller 2 and the second roller 3, ensuring that the first roller 2 and the second roller 3 maintain the correct position and orientation during operation. Simultaneously, the support bearings 8 allow the first roller 2 and the second roller 3 to rotate under low-friction conditions, reducing direct contact between the first roller 2 and the second roller 3 and the housing 1, thereby reducing wear and extending the service life of the double roll crusher 100.

[0085] In some embodiments of the present invention, such as Figure 4 As shown, the double roll crusher 100 also includes two base springs 9, which are located on the opposite side of the first roller 2 and the second roller 3, respectively. One end of the two base springs 9 is connected to the housing 1, and the other end of the two base springs 9 is connected to the first roller 2 and the second roller 3, respectively. The two base springs 9 are used to drive the first roller 2 and the second roller 3 to move toward each other.

[0086] The other ends of the two base springs 9 can be connected to the support bearings 8 of the first roller 2 and the second roller 3, respectively. When encountering uncrushable materials or hard objects such as iron blocks, the compression of the base springs 9 can adjust the position of the support bearings 8, increasing the gap between the first roller 2 and the second roller 3. This allows the first roller 2 and the second roller 3 to actively avoid each other, thus protecting them from damage. After the uncrushable or hard materials are discharged between the first roller 2 and the second roller 3, the two base springs 9 can push the support bearings 8 to drive the first roller 2 and the second roller 3 to move closer to each other, thereby enabling the first roller 2 and the second roller 3 to quickly and synchronously reset, maintaining the normal operation of the double-roll crusher 100.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0088] Although embodiments of the invention have been shown and described, those skilled in the art will understand 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 claims and their equivalents.

Claims

1. A double-roll crusher, suitable for lithium-ion battery cathode materials, characterized in that, include: The box body has a feeding port on its upper end face; A first roller and a second roller are rotatably disposed within the housing. The first roller and the second roller are spaced apart in a first direction in a horizontal plane to form a material crushing zone. The material crushing zone is disposed opposite to the feed inlet in the vertical direction. The first direction, the axial direction of the first roller / second roller, and the vertical direction are perpendicular to each other. A first rotating shaft is disposed between the first roller and the top wall of the housing, and the first rotating shaft extends along the axial direction of the first roller. The second rotating shaft is disposed between the second roller and the top wall of the box body. The second rotating shaft extends along the axial direction of the second roller. The first rotating shaft and the second rotating shaft are respectively disposed on both sides of the feeding port in the first direction. The first roller, the second roller, the first shaft, and the second shaft are ceramic parts; The minimum gap between the first roller and the second roller, the minimum gap between the first rotating shaft and the top wall of the housing, and the minimum gap between the second rotating shaft and the top wall of the housing are all equal, and are greater than or equal to 1 mm and less than or equal to 2 mm. The first rotating shaft and the first roller rotate in opposite directions, and the second rotating shaft and the second roller rotate in opposite directions. The minimum gap between the first rotating shaft and the first roller is equal to the minimum gap between the first roller and the second roller; the minimum gap between the second rotating shaft and the second roller is equal to the minimum gap between the first roller and the second roller.

2. The double-roll crusher according to claim 1, characterized in that, Also includes: A driving device for driving at least one of the first roller, the second roller, the first shaft, and the second shaft to rotate.

3. The double-roll crusher according to claim 1, characterized in that, The first roller and the second roller are spaced apart, the first rotating shaft is spaced apart from the first roller, and the second rotating shaft is spaced apart from the second roller.

4. The double-roll crusher according to claim 3, characterized in that, Also includes: The driving assembly comprises two components, one of which is used to simultaneously drive the first roller and the second shaft to rotate, and the other of which is used to simultaneously drive the second roller and the first shaft to rotate.

5. The double-roll crusher according to claim 4, characterized in that, Each of the aforementioned drive components includes: The transmission component comprises two components, which are respectively connected to the first roller and the second rotating shaft, or the two transmission components are respectively connected to the second roller and the first rotating shaft; A driving component, wherein there is one driving component, which is used to drive two transmission components simultaneously.

6. The double-roll crusher according to claim 3, characterized in that, The inner wall of the box is provided with an inner lining coating, the copper content of the inner lining coating is less than or equal to 0.5%, and the zinc content of the inner lining coating is less than or equal to 1%.

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