Roll crusher

Abstract

The invention discloses a double-roller crusher. The double-roller crusher comprises a box body, a first roller wheel, a second roller wheel, a first rotating shaft and a second rotating shaft, a feeding port is formed in the upper end face of the box body, the first roller and the second roller are arranged in the box body in a relative rotation mode, the first roller and the second roller are meshed in the horizontal plane in the first direction or arranged at intervals to form a material crushing area, and the material crushing area and the feeding port are oppositely arranged in the vertical direction. The first rotating shaft is arranged between the first roller and the top wall of the box body and extends in the axial direction of the first roller; the second rotating shaft is arranged between the second roller and the top wall of the box body and extends in the axial direction of the second roller. According to the double-roller crusher, the uniformity of crushed materials can be improved, abrasion or shutdown caused by material blockage can be avoided, the operation stability is high, the material treatment efficiency is high, the maintenance time can be shortened, and the cost can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of crushers, in particular to a double-roll crusher. Background Art

[0002] In the related art, two rollers are provided in the double-roll crusher, and a gap is provided between the two rollers and the top wall of the box to avoid friction caused by contact between the rollers and the box. When the double-roll crusher crushes materials, some material debris will splash into the gap between the two rollers and the top wall of the box and gradually block the gap, increasing the friction of the two rollers, and eventually making the rollers unable to rotate, causing material blockage, and even causing the motor driving the rollers to rotate to overload, which in turn causes tripping, and the entire double-roll crusher to stop, seriously affecting the operating efficiency of the double-roll crusher.

[0003] Even if the double-roll crusher does not trip due to material blockage, uneven crushing may occur because large particles enter the gap between the roller and the top wall of the box without being completely crushed, making the particle size of the crushed material uncontrollable. Especially in the field of lithium-ion batteries, the particle size of the positive electrode material is one of the key factors affecting its electrochemical performance. The particle size not only affects the specific surface area, ion diffusion rate and electron transfer efficiency of the material, but also affects the reaction kinetics and capacity decay behavior of the material during the charge and discharge process. The ideal particle size distribution can optimize the energy capacity and cycle and other electrical properties of lithium batteries. Therefore, the particle size distribution of the positive electrode material is very important both in the R&D stage and in the mass production stage. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a double-roll crusher, which can improve the uniformity of crushed materials, avoid wear or shutdown caused by material blockage, have high operating stability and high material processing efficiency, and can also reduce maintenance hours and costs.

[0005] According to an embodiment of the present invention, the double-roll crusher comprises: a box, a first roller, a second roller, a first rotating shaft and a second rotating shaft. A feeding port is provided on the upper end surface of the box, the first roller and the second roller are arranged in the box so as to rotate toward each other, the first roller and the second roller are meshed or spaced in a first direction in a horizontal plane to form a material crushing zone, the material crushing zone is arranged relative to the feeding port in the up-down direction, wherein the first direction, the axial direction of the first roller / second roller and the up-down direction are perpendicular to each other; the first rotating shaft is arranged between the first roller and the top wall of the box, and the first rotating shaft extends along the axial direction of the first roller; the second rotating shaft is arranged between the second roller and the top wall of the box, and the second rotating shaft extends along the axial direction of the second roller, and the first rotating shaft and the second rotating shaft are respectively arranged on both sides of the feeding port in the first direction.

[0006] According to the double-roll crusher of the embodiment of the present invention, by arranging a first rotating shaft extending along the axial direction of the first roller between the first roller and the top wall of the box body, and arranging a second rotating shaft extending along the axial direction of the second roller between the second roller and the top wall of the box body, part of the material can be blocked from entering the gap between the first roller, the second roller and the top wall of the box body, thereby preventing large particle materials that do not meet the standards from slipping out, improving the uniformity of the crushed materials, and preventing the double-roll crusher from being blocked by materials and causing wear or shutdown, which can improve the operating stability of the double-roll crusher and extend the stable operating time, thereby improving the efficiency of processing materials, reducing maintenance hours and reducing costs.

[0007] According to some embodiments of the present invention, the first rotating shaft and the second rotating shaft are rotatably disposed in the box, 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 is meshed with the second roller, the first rotating shaft is meshed with the first roller, and the second rotating shaft is meshed with the second roller.

[0010] In some embodiments of the present invention, the double-roll crusher further comprises a driving device, and the driving device is used to drive at least one of the first roller, the second roller, the first rotating shaft and the second rotating shaft to rotate.

[0011] In some embodiments of the present invention, the first roller, the second roller, the first rotating shaft and the second rotating 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 and the first roller are spaced apart, and the second rotating shaft and the second roller are spaced apart. In the present application, the spacing is preferably set. In the field of positive electrode materials, if meshing crushing is used, the problem of over-crushing will occur. The micro powder has a high proportion, a large specific surface area, and a small tap density. Generally, it cannot be sold as a finished product and can only be recycled as a waste product. It may also affect the structural stability of the positive electrode material particles, cause intercrystalline cracks, and reduce the electrical properties of the positive electrode material.

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

[0014] Furthermore, the two driving assemblies have the same rotational speed and opposite driving directions.

[0015] In some embodiments of the present invention, each of the driving components includes a transmission member and a driving member, and there are two transmission members, and the two transmission members are respectively connected to the first roller and the second rotating shaft, or the two transmission members are respectively connected to the second roller and the first rotating shaft; there is one driving member, which is used to drive the two transmission members at the same time.

[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 positive electrode materials, semi-finished products that have undergone a high-temperature sintering process generally need to be crushed and classified to meet product standards. Different positive electrode materials have different sintering temperatures. Some materials have severe agglomeration due to their high sintering temperatures, and different levels of crushing are required. If the material is too coarse after crushing, it is not conducive to the uniform distribution of subsequent sintering elements. If it is too fine, it will affect the electrical properties of the finished positive electrode 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 rotating shaft and the second rotating shaft are ceramic parts. In the field of positive electrode materials for lithium-ion batteries, the requirements for the content of metallic foreign matter are very strict. For example, the molar content of elemental iron is required to be less than 3×10 -8 In the present application, the first roller, the second roller, the first rotating shaft and the second rotating shaft are all set as ceramic parts, which can prevent contamination by metal impurities.

[0019] In some embodiments of the present invention, the inner wall of the box body 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%. When the above-mentioned coating is provided and the conditions are met, it can be used in the field of positive electrode materials to avoid the introduction of metal elements such as copper and zinc to pollute the materials during the crushing process.

[0020] In some embodiments of the present invention, the double-roll crusher further comprises a rotary bearing, wherein the rotary bearing is disposed between the first rotating shaft and the housing, and wherein the rotary bearing is disposed 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 box is b, and satisfies: 1mm≤b≤2mm; and / or the minimum gap between the second rotating shaft and the top wall of the box is b, and satisfies: 1mm≤b≤2mm. When the above conditions are met, when the positive electrode material is crushed in the box, the particle size distribution is uniform, and the particle size is relatively uniform and controllable, thereby improving the electrical properties of the positive electrode material.

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

[0023] In some embodiments of the present invention, the double-roll crusher also includes two base springs, which are respectively located on the side of the first roller and the second roller facing away from each other, one end of the two base springs is connected to the box body, and the other ends of the two base springs are respectively connected to the support bearing of the first roller and the support bearing of the second roller, and the two base springs are used to drive the first roller and the second roller to move in a direction close to each other.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0030] Reference numerals:

[0031] 100. Roller crusher;

[0032] 1. Box body; 11. Feeding port; 12. Crushing chamber; 13. Discharging port; 14. Material crushing area;

[0033] 2. The first roller;

[0034] 3. Second roller;

[0035] 4. The first rotating shaft;

[0036] 5. Second rotating shaft;

[0037] 6. driving device; 61. first motor; 62. second motor;

[0038] 7. driving assembly; 71. transmission member; 72. driving member;

[0039] 8. Support bearing;

[0040] 9. Base spring. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Reference below Figure 1-Figure 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 the embodiment of the present invention includes a box body 1, a first roller 2, a second roller 3, a first rotating shaft 4 and a second rotating shaft 5.

[0046] Specifically, Figure 1-Figure 3 As shown, a feeding port 11 is provided on the upper end surface of the box body 1, and the first roller 2 and the second roller 3 are relatively rotatably arranged in the box body 1, and the first roller 2 and the second roller 3 are meshed or spaced along a first direction in a horizontal plane to form a material crushing zone 14, and the material crushing zone 14 is arranged relative to the feeding port 11 in the up and down directions, wherein the first direction, the axial direction of the first roller 2 and the up and down directions are perpendicular to each other.

[0047] See also Figure 2It can be understood that the housing 1 has a crushing chamber 12, the first roller 2 and the second roller 3 are arranged in the crushing chamber 12, and the feeding port 11 is arranged at the upper part of the housing 1 and communicated with the crushing chamber 12, and is used to feed the material to be crushed into the crushing chamber 12. The rotation axis of the first roller 2 and the rotation axis of the second roller 3 are arranged in a first direction in a horizontal plane and are parallel to each other. The feeding port 11 and the material crushing area 14 formed by the spacing or meshing of the first roller 2 and the second roller 3 are arranged opposite to each other, so that the material to be crushed can fall from the feeding port 11 into the first roller 2 and the second roller 3. At the same time, the first roller 2 and the second roller 3 rotate relative to each other and one end close to each other rotates downward, so that the material can be rolled between the first roller 2 and the second roller 3, and the material is crushed by strong extrusion and shearing. The lower end of the housing 1 can be provided with a discharge port 13, and the crushed material naturally falls and is discharged from the crushing chamber 12 from the discharge port 13.

[0048] Further, the first rotating shaft 4 is disposed between the first roller 2 and the top wall of the box body 1, and the first rotating shaft 4 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 box body 1, and the second rotating shaft 5 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 the prior art, in order to avoid friction caused by contact between the first roller and the second roller and the box body, a gap is provided between the first roller and the second roller and the top wall of the box body and the two side walls along the first direction. When the material is rolled into the gap between the first roller and the second roller for crushing, some material debris will splash into the gap between the first roller and the second roller and the top wall of the box body, so that large pieces of crushed material debris that do not meet the standards fall from the two sides of the first roller and the second roller away from each other and are discharged from the crushing chamber from the discharge port. In addition, some material debris is easy to accumulate in the gap between the first roller and the second roller and the top wall of the box body. As time accumulates, the gap between the first roller and the second roller and the top wall of the box body is gradually blocked, and the friction force of the first roller and the second roller in rotation increases, which eventually makes the first roller and the second roller unable to rotate and causes material blocking, and even causes the motor driving the first roller and the second roller to rotate to overload, thereby causing tripping and the entire double-roll crusher to stop.

[0050] In the present application, by providing the first rotating shaft 4 and the second rotating shaft 5, part of the 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 box body 1, thereby preventing large pieces of material that do not meet the standards from being discharged from the discharge port 13, improving the uniformity of the crushed material, and thus improving the accuracy and quality of the material processed by the roller crusher 100. It can also prevent the gap between the first roller 2 and the second roller 3 and the top wall of the box body 1 from being blocked and causing wear, thereby preventing the roller crusher 100 from being blocked and shutting down. It can improve the operating stability of the roller crusher 100 and extend the stable operating time, thereby reducing the number of maintenance and maintenance hours, thereby improving the material processing efficiency of the roller crusher 100, and reducing the maintenance cost and operating cost of the roller crusher 100.

[0051] According to the double-roll crusher 100 of the embodiment of the present invention, by arranging 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 box body 1, and arranging 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 box body 1, part of the material can be blocked from entering the gap between the first roller 2 and the second roller 3 and the top wall of the box body 1, thereby preventing large particle materials that do not meet the standards from slipping out, improving the uniformity of the crushed materials, and preventing the double-roll crusher 100 from being blocked by materials and causing wear or shutdown, thereby improving the operating stability of the double-roll crusher 100 and extending the stable operating time, thereby improving the efficiency of processing materials, reducing maintenance hours and reducing costs.

[0052] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the first rotating shaft 4 and the second rotating shaft 5 are rotatably disposed in the housing 1, the rotation axis of the first rotating shaft 4 and the rotation axis of the first roller 2 are parallel to each other, and the rotation axis of the second rotating shaft 5 and the rotation axis of the second roller 3 are parallel to each other. When part of the 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 to between the first roller 2 and the second roller 3, which can effectively improve the effect of blocking the material debris, thereby avoiding the blockage of the double-roll crusher 100 and stopping the operation, and can better improve the operation stability of the double-roll crusher 100, thereby improving the efficiency of processing materials, and can also reduce maintenance hours and reduce 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 part of the material debris splashes into the gap between the first roller 2, the second roller 3 and the top wall of the box body 1, the rotation direction of the first rotating shaft 4 and the second rotating shaft 5 can drive the material debris back to between the first roller 2 and the second roller 3. The reasonable structural setting can effectively improve the effect of blocking the material debris from entering the gap between the first roller 2, the second roller 3 and the top wall of the box body 1, thereby avoiding the blockage and shutdown of the double-roll crusher 100, and can better improve the operation 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, so that the material fragments splashing into the gap between the first roller 2 and the top wall of the box body 1 can be rolled into the gap between the first rotating shaft 4 and the first roller 2, and the material is crushed by strong squeezing and shearing, and then naturally falls from the side of the first roller 2 away from the second roller 3 and is discharged from the crushing chamber 12 from the discharge port 13, thereby avoiding the discharge of non-standard materials from the discharge port 13, and further improving the accuracy and quality of material processing by the double-roll crusher 100.

[0055] Similarly, the second rotating shaft 5 and the second roller 3 rotate relative to each other, so that the material fragments splashing into the gap between the second roller 3 and the top wall of the box body 1 can be rolled into the gap between the second rotating shaft 5 and the second roller 3, and the material is crushed by strong squeezing and shearing, and then naturally falls from the side of the second roller 3 away from the first roller 2 and is discharged from the crushing chamber 12 from the discharge port 13, thereby avoiding the discharge of non-standard materials from the discharge port 13, and further improving the accuracy and quality of material processing by the double-roll crusher 100.

[0056] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the first roller 2 and the second roller 3 are meshed, the first rotating shaft 4 is meshed with the first roller 2, and the second rotating shaft 5 is meshed with the second roller 3. The meshing of the first roller 2 and the second roller 3 can realize that the first roller 2 and the second roller 3 rotate in opposite directions, so that when the material to be crushed falls from the feeding port 11 between the first roller 2 and the second roller 3, the material will be crushed by strong squeezing and shearing, which can ensure the accuracy and quality of the crushed material of the double-roll crusher 100.

[0057] The first rotating shaft 4 is meshed with the first roller 2, and the second rotating shaft 5 is meshed 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, so that the splashed material fragments can be driven back between the first roller 2 and the second roller 3. The structural design is reasonable and easy to implement.

[0058] Furthermore, the meshing first rotating shaft 4 and the first roller 2 can squeeze and crush the material fragments splashing into the gap between the first roller 2 and the top wall of the box body 1 again, and the meshing second rotating shaft 5 and the second roller 3 can squeeze and crush the material fragments splashing into the gap between the second roller 3 and the top wall of the box body 1 again, thereby avoiding the discharge of non-standard materials from the discharge port 13, and further improving the accuracy and quality of the crushed materials of the double-roll crusher 100.

[0059] In some embodiments of the present invention, Figure 1-Figure 3 As shown, the double-roll crusher 100 further includes a driving device 6, which is used to drive 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. The driving device 6 can be specifically a driving motor, and the output shaft of the driving 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, and 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. Among them, the first roller 2 and the second roller 3 rotate in opposite directions, 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.

[0060] For example, Figure 1 and Figure 2 In the example shown, the driving 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 joint rotation of the first roller 2 and the second roller 3, ensure the shear force between the first roller 2 and the second roller 3, and thus improve the quality of the crushed material of the double-roll crusher 100.

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

[0062] In some embodiments of the present invention, the first roller 2, the second roller 3, the first rotating shaft 4 and the second rotating shaft 5 are metal parts. The metal parts have strong structural strength and high wear resistance, which can extend the service life of the double-roll crusher 100, and facilitate the processing of mutually matching teeth on the surfaces of the first roller 2, the second roller 3, the first rotating shaft 4 and the second rotating shaft 5, so as to achieve a meshing connection relationship and thus achieve a transmission effect. The first roller 2, the second roller 3, the first rotating shaft 4 and the second rotating shaft 5 can be specifically a plum blossom roller or a gear roller made of metal material, which can be applied to the sandstone industry.

[0063] In some embodiments of the present invention, Figure 4 As shown, the first roller 2 and the second roller 3 are spaced apart, the first rotating shaft 4 and the first roller 2 are spaced apart, and the second rotating shaft 5 and the second roller 3 are spaced apart. In this way, the first roller 2, the second roller 3, the first rotating shaft 4 and the second rotating shaft 5 are prevented from contacting each other and causing wear during rotation, thereby preventing debris from being mixed into the crushed material, and improving the accuracy and quality of the material processed by the double-roll crusher 100.

[0064] In the present application, it is preferred that the first roller 2 and the second roller 3 are arranged at intervals. In the field of positive electrode materials, if the first roller and the second roller are meshed, crushing problems will occur. The micropowder accounts for a high proportion, has a large specific surface area and a small tap density. Generally, it cannot be sold as a finished product and can only be recycled as waste. It may also affect the structural stability of the positive electrode material particles, cause intercrystalline cracks and other phenomena, and reduce the electrical properties of the positive electrode material.

[0065] In some embodiments of the present invention, Figure 4 As shown, the double-roll crusher 100 further includes a driving assembly 7, and there are two driving assemblies 7, one of which is used to simultaneously drive the first roller 2 and the second rotating shaft 5 to rotate, and the other driving 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 rotating shaft 5 rotate in opposite directions, the first roller 2 and the second rotating shaft 5 rotate in the same direction, and similarly, the second roller 3 and the first rotating shaft 4 rotate in the same direction. Therefore, the first roller 2 and the second rotating shaft 5 can be driven to rotate by the same driving assembly 7, and the second roller 3 and the first rotating shaft 4 can be driven to rotate by the same driving assembly 7, which can save the number of driving assemblies 7 and thus save costs.

[0067] The first roller 2 and the second rotating shaft 5 are connected to the output shaft of the same driving assembly 7, so that the driving 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 driving assembly 7, so that the other driving 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 driving components 7 have the same rotation speed and opposite driving directions. Thus, the two driving components 7 can respectively drive the first roller 2 and the second roller 3 to rotate at the same rotation speed and in opposite directions, and drive the first roller 2 and the first rotating shaft 4 to rotate at the same rotation speed and in opposite directions, and drive the second roller 3 and the second rotating shaft 5 to rotate at the same rotation speed and in opposite directions, so that the materials can be uniformly squeezed and crushed 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, Figure 4 As shown, each driving assembly 7 includes a transmission member 71 and a driving member 72. There are two transmission members 71, and the two transmission members 71 are respectively connected to the first roller 2 and the second rotating shaft 5, or the two transmission members 71 are respectively connected to the second roller 3 and the first rotating shaft 4; there is one driving member 72, which is used to drive the two transmission members 71 at the same time.

[0070] It is understandable that the transmission member 71 can be specifically a transmission belt, and the two transmission members 71 are respectively connected to the first roller 2 and the second rotating shaft 5 or to the second roller 3 and the first rotating shaft 4, and the two transmission belts are connected to the output shaft of the same driving member 72, and the output shaft of the driving member 72 can output torque, which can drive the two transmission belts to rotate in the same direction, so that the first roller 2 and the second rotating shaft 5 can be driven to rotate in the same direction through the transmission member 71, or the second roller 3 and the first rotating shaft 4 can be driven to rotate in the same direction through the transmission member 71, which has a simple structure and is easy to implement, and has high transmission stability. It is sufficient to set one driving member 72 in each driving assembly 7, which can save the number of driving members 72 and thus save costs.

[0071] In some embodiments of the present invention, the minimum gap between the first roller 2 and the second roller 3 is a, and satisfies: 1mm≤a≤2mm. If a>2mm, the gap between the first roller 2 and the second roller 3 is too large, and the extrusion force and shear force on the material when passing through the gap between the first roller 2 and the second roller 3 will be reduced, resulting in insufficient material crushing, producing more coarse particles, making the particle size of the crushed material uneven, and reducing the crushing quality. It will also cause the material to slide between the first roller 2 and the second roller 3, reducing the crushing efficiency. If a<1mm, the gap between the first roller 2 and the second roller 3 is too small, and excessive crushing requires more energy, resulting in increased energy consumption of the equipment, and increasing the friction between the surface of the first roller 2 and the second roller 3 and the material, accelerating the wear of the first roller 2 and the second roller 3, thereby shortening the service life of the double-roll crusher 100.

[0072] In the field of lithium-ion positive electrode materials, semi-finished products that have undergone a high-temperature sintering process generally need to be crushed and graded to meet product standards. Different positive electrode materials have different sintering temperatures. Some materials have severe agglomeration due to their high sintering temperatures and require different levels of crushing. If the material is too coarse after crushing, it will not be conducive to the uniform distribution of subsequent sintering elements. If it is too fine, it will affect the electrical properties of the finished positive electrode material.

[0073] Therefore, 1mm≤a≤2mm, and the gap between the first roller 2 and the second roller 3 is moderate, which can not only ensure the crushing effect and improve the uniformity of the particle size of the material crushed, thereby improving the crushing quality and crushing efficiency, but also avoid increasing energy consumption and reducing wear, which is beneficial to extending the service life of the double-roll crusher 100.

[0074] In some embodiments of the present invention, 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. The material debris splashing into the gap between the first roller 2 and the top wall of the box body 1 will be drawn into the gap between the first rotating shaft 4 and the first roller 2, so that the material is crushed by strong squeezing and shearing, so 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 further improving the accuracy and quality of the material processed by the double-roll crusher 100.

[0075] In some embodiments of the present invention, 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. The material debris splashing into the gap between the second roller 3 and the top wall of the box body 1 will be drawn into the gap between the second rotating shaft 5 and the second roller 3, so that the material is crushed by strong squeezing and shearing, so 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 further improving the accuracy 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 rotating shaft 4 and the second rotating shaft 5 are ceramic parts. Ceramic parts have extremely high hardness and wear resistance, can withstand high-intensity friction and wear, can extend the service life of the first roller 2, the second roller 3, the first rotating shaft 4 and the second rotating shaft 5, and reduce the replacement frequency and maintenance cost. In this way, when the double-roll crusher 100 is running, the ceramic parts are in contact with the material, which can effectively inhibit the generation of metal foreign matter, thereby ensuring the purity of the crushed product, and can improve the quality of the crushed material of the double-roll crusher 100, which is 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 -8 In the present application, the first roller 2, the second roller 3, the first rotating shaft 4 and the second rotating shaft 5 are all set as ceramic parts, which can prevent contamination by metal impurities.

[0078] In some embodiments of the present invention, the inner wall of the box body 1 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%. When the material is crushed again, splashing will occur. Providing the inner lining coating on the inner wall of the box body 1 can prevent the material from splashing to the inner wall of the box body 1 and generating metal debris, thereby ensuring the purity of the crushed product, and can improve the quality of the crushed material of the roller crusher 100, which is suitable for industries with high purity requirements such as the lithium battery industry. When the above-mentioned coating is provided and the above-mentioned conditions are met, it can be used in the field of positive electrode materials to avoid the introduction of metal elements such as copper and zinc to pollute the material during the crushing process.

[0079] In some embodiments of the present invention, the roller crusher 100 further includes a rotating bearing, a rotating bearing is provided between the first rotating shaft 4 and the housing 1, and a rotating bearing is provided between the second rotating shaft 5 and the housing 1. The rotating bearing can 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 direction during operation. At the same time, the rotating bearing allows the first rotating shaft 4 and the second rotating shaft 5 to rotate under low friction conditions, which can reduce the 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 roller 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 box body 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 box body 1 is too large, so that some material debris may splash into the gap between the first rotating shaft 4 and the top wall of the box body 1 and block the gap, resulting in material blocking, which may 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 box body 1 is too small, and the first rotating shaft 4 is prone to friction with the box body 1, affecting the service life of the first rotating shaft 4.

[0081] Therefore, 1mm≤b≤2mm can avoid friction between the first rotating shaft 4 and the housing 1, thereby ensuring the service life of the first rotating shaft 4, and avoid material blocking between the first rotating shaft 4 and the housing 1, which can improve the operation stability of the first rotating shaft 4 and extend the stable operation time, thereby reducing the number of maintenance times and maintenance hours, and further improving the operation efficiency of the roller crusher 100. When the above conditions are met, when the positive electrode material is crushed in the housing, the particle size distribution is uniform, and the particle size is relatively uniform and controllable, thereby improving the electrical properties 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 box body 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 box body 1 is too large, so that some material debris may splash into the gap between the second rotating shaft 5 and the top wall of the box body 1 and block the gap, resulting in material blocking, which may 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 box body 1 is too small, and the second rotating shaft 5 is prone to friction with the box body 1, which affects the service life of the second rotating shaft 5.

[0083] Therefore, 1mm≤b≤2mm can be made, which can not only avoid friction between the second rotating shaft 5 and the box body 1, thereby ensuring the service life of the second rotating shaft 5, but also avoid blockage between the second rotating shaft 5 and the box body 1, which can improve the operation stability of the second rotating shaft 5 and extend the stable operation time, thereby reducing the number of maintenance and maintenance hours, and further improving the operation efficiency of the double-roll crusher 100.

[0084] In some embodiments of the present invention, Figure 4 As shown, the double-roll crusher 100 further includes a support bearing 8, a support bearing 8 is provided between the first roller 2 and the housing 1, and a support bearing 8 is provided between the second roller 3 and the housing 1. The support bearing 8 can 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 direction during operation. At the same time, the support bearing 8 allows the first roller 2 and the second roller 3 to rotate under low friction conditions, which can reduce the 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, Figure 4 As shown, the double-roll crusher 100 also includes two base springs 9, which are respectively located on the side of the first roller 2 and the second roller 3 facing away from each other, one end of the two base springs 9 is connected to the box body 1, and the other ends of the two base springs 9 are respectively connected to the first roller 2 and the second roller 3, and 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 support bearings 8 of the second roller 3, respectively. When encountering unbreakable objects or hard objects such as iron blocks, the position of the support bearings 8 can be adjusted by compressing the base springs 9, so that the gap between the first roller 2 and the second roller 3 is increased, and the first roller 2 and the second roller 3 are actively avoided, thereby protecting the first roller 2 and the second roller 3 from damage. When the unbreakable objects or hard objects are discharged from 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 in a direction close to each other, so that the first roller 2 and the second roller 3 are quickly and synchronously reset to maintain the normal operation of the double-roll crusher 100.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0088] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A double roll crusher, characterized in that: include: A box body, wherein the upper end surface of the box body is provided with a feeding port; A first roller and a second roller, wherein the first roller and the second roller are relatively rotatably arranged in the box, the first roller and the second roller are meshed or spaced in a first direction in a horizontal plane to form a material crushing zone, and the material crushing zone is arranged opposite to the feeding port in the up-down direction, wherein the first direction, the axial direction of the first roller / the second roller, and the up-down direction are perpendicular to each other; A first rotating shaft, the first rotating shaft is arranged between the first roller and the top wall of the box body, and the first rotating shaft extends along the axial direction of the first roller; The second rotating shaft is arranged 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, and the first rotating shaft and the second rotating shaft are respectively arranged on both sides of the feeding port in the first direction.

2. The roller crusher according to claim 1, characterized in that: 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.

3. The roller crusher according to claim 2, characterized in that: The first roller is meshed with the second roller, the first rotating shaft is meshed with the first roller, and the second rotating shaft is meshed with the second roller.

4. The roller crusher according to claim 3, characterized in that: Also includes: A driving device is used to drive at least one of the first roller, the second roller, the first rotating shaft and the second rotating shaft to rotate.

5. The double-roll crusher according to claim 2, characterized in that: The first roller and the second roller are arranged at intervals, the first rotating shaft and the first roller are arranged at intervals, and the second rotating shaft and the second roller are arranged at intervals.

6. The roller crusher according to claim 5, characterized in that: Also includes: There are two driving assemblies, one of which is used to simultaneously drive the first roller and the second rotating shaft to rotate, and the other driving assembly is used to simultaneously drive the second roller and the first rotating shaft to rotate.

7. The double-roll crusher according to claim 6, characterized in that: Each of the drive assemblies comprises: Transmission member, wherein there are two transmission members, and the two transmission members are respectively connected to the first roller and the second rotating shaft, or the two transmission members are respectively connected to the second roller and the first rotating shaft; The driving member is one and is used to drive the two transmission members simultaneously.

8. The roll crusher according to claim 5, characterized in that: The minimum gap between the first roller and the second roller is a, and satisfies: 1mm≤a≤2mm; and / or, 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.

9. The double-roll crusher according to claim 5, characterized in that: The first roller, the second roller, the first rotating shaft and the second rotating shaft are ceramic parts; And / or, the inner wall of the box body 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%.

10. The double roll crusher according to claim 1, characterized in that: The minimum gap between the first rotating shaft and the top wall of the box body is b, and satisfies: 1mm≤b≤2mm; And / or, the minimum gap between the second rotating shaft and the top wall of the box body is b, and satisfies: 1mm≤b≤2mm.

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