Rotary sintering furnace

Abstract

The utility model discloses a rotary sintering furnace, which belongs to the technical field of sintering equipment, and comprises a furnace body component, a furnace cover component and a furnace cover component, the bracket is arranged outside the converter, and the converter rotates relative to the bracket; the knocking piece is movably mounted on the bracket and used for knocking the converter, the driving convex part rotates along with the converter and is in movable contact with the knocking piece, and the driving convex part drives the knocking piece to move so as to be separated from the converter in the state that the driving convex part is in contact with the knocking piece; and in the state that the driving convex part is separated from the knocking piece, the knocking piece is suitable for moving towards the converter to knock the converter. According to the rotary sintering furnace, the converter can be knocked in the sintering process, materials bonded in the converter can be knocked off in time, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the field of sintering equipment, in particular to a rotary sintering furnace. Background Art

[0002] The rotary sintering furnace is a thermal equipment for calcining, roasting or drying granular and powdered materials (such as precursors of lithium-ion battery positive electrode materials). It has the advantages of combustion system, strong technical power, precise gas distribution, and low burn-out rate. It can be used for drying, dehydrating and roasting materials in the chemical industry. For example, it can be used for the production and manufacturing of lithium-ion battery positive electrode materials in the battery field. The rotary sintering furnace used for the production and manufacturing of lithium-ion battery positive electrode materials can be an electric heating continuous production device. Before normal operation, the furnace is first dried. When the converter temperature rises to the process requirements, the material to be roasted is sent into the converter through the guide pipe of the feed box at the furnace head. The material is indirectly heated by the converter to achieve the purpose of roasting. There are spiral blades in the converter, and the spiral blades rotate slowly with the converter. The material is roasted in the converter while moving toward the tail of the furnace through the spiral blades, and finally sent to the next device by the discharge box at the tail of the furnace. When the rotary sintering furnace is used to manufacture lithium-ion battery positive electrode materials, it is found that the lithium-ion battery positive electrode materials are prone to problems such as bonding skin materials and excessive impurity content. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a rotary sintering furnace, which is conducive to reducing the bonding skin material in the discharged product and reducing the impurity content in the product.

[0004] According to the rotary sintering furnace of the utility model embodiment, it includes: a furnace body assembly, the furnace body assembly includes a converter, the outer peripheral surface of the converter is provided with a driving protrusion; a bracket, the bracket is arranged outside the converter, and the converter rotates relative to the bracket; a knocking piece, the knocking piece is movably installed on the bracket and is used to knock the converter, the knocking piece is a long plate-like structure, which has a connecting end and a knocking end arranged opposite to each other, the connecting end is rotatably connected to the bracket, the straight-line distance L1 between the connecting end and the knocking end is greater than the minimum distance L2 between the connecting end and the outer peripheral surface of the converter, wherein the driving protrusion rotates with the converter and is in active contact with the knocking piece, and when the driving protrusion is in contact with the knocking piece, the driving protrusion The part drives the knocking piece to move around the rotation axis of the connecting end so that the knocking end is separated from the converter; and when the driving protrusion is separated from the knocking piece, the knocking piece is suitable for rotating around the rotation axis of the connecting end at least under the action of gravity, so that the knocking end moves toward the converter to knock the converter; the connecting end is located above the central horizontal plane of the converter and on the side of the central vertical plane of the converter opposite to the rotation direction of the converter, the plane where the rotation axis of the connecting end and the rotation axis of the converter are located is the first plane, and the knocking end is located on the side of the first plane along the rotation direction of the converter; the radius of the converter is R1, and the maximum protrusion height of the driving protrusion along the radial direction of the converter is R2, wherein,

[0005]

[0006] According to the rotary sintering furnace of the embodiment of the utility model, the material stuck in the converter can be knocked off in time by knocking the converter with the knocking piece during the sintering process, thereby improving the temperature uniformity of the inner wall of the converter during the sintering process, reducing the possibility of reaction between the material and the furnace wall material, and improving the problem of impurities or overburned materials in the product, thereby improving the quality of the prepared product, and the knocking piece can automatically knock the converter as the converter rotates, without adding other components to drive the knocking work of the knocking piece, which is conducive to simplifying the structure and is easy to implement, and the cleaning process does not require manual assistance or manual cleaning, thereby reducing the cost of manual cleaning.

[0007] In addition, the rotary sintering furnace according to the above embodiment of the utility model may also have the following additional technical features:

[0008] According to some embodiments of the present invention, the rotary sintering furnace further includes an elastic member, which abuts against the knocking member and applies an elastic force toward the converter to the knocking member, so as to drive the knocking member to knock the converter.

[0009] According to some embodiments of the utility model, the surface of the driving protrusion along the side of the rotation direction of the converter includes a driving surface, which is used to contact the knocking end and drive the knocking piece to rotate, and the driving surface is inclined along the rotation direction of the converter close to the central axis of the converter.

[0010] According to some embodiments of the utility model, a pad is provided on the outer peripheral surface of the converter, and the knocking piece acts on the converter by knocking the pad, and the contact area between the pad and the converter is larger than the contact area between the knocking piece and the pad.

[0011] According to some embodiments of the present invention, the cushion block is made of the same material as the converter; and / or the driving protrusion is provided on the cushion block.

[0012] According to some embodiments of the utility model, the outer circumferential surface of the converter is provided with a plurality of the driving protrusions, and the plurality of the driving protrusions corresponding to the same knocking member are arranged at intervals along the circumference of the converter, and the plurality of the driving protrusions rotate with the converter and drive the knocking member to move in turn.

[0013] According to some embodiments of the utility model, the furnace body assembly also includes an insulation shell, the converter is rotatably inserted into the insulation shell, and the furnace head and furnace tail of the converter are respectively located outside the insulation shell, wherein the knocking piece is correspondingly provided at least at one of the furnace head and the furnace tail; and / or, the knocking piece knocks the converter at least under the action of gravity, and the knocking piece is at least partially located inside the insulation shell.

[0014] According to some embodiments of the present invention, the polishing degree Ra of the furnace cavity wall of the converter is less than or equal to 3 μm; and / or the material of the converter is stainless steel or alloy.

[0015] According to some embodiments of the present invention, the rotary sintering furnace is used in the preparation of positive electrode materials for lithium-ion batteries to dynamically sinter the raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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:

[0017] Figure 1 It is a flow chart of a method for preparing a positive electrode material for a lithium-ion battery using a rotary sintering furnace according to an embodiment of the utility model;

[0018] Figure 2 It is a front view of a rotary sintering furnace according to an embodiment of the utility model;

[0019] Figure 3is a schematic diagram of a rotary sintering furnace according to an embodiment of the utility model, wherein two states of the same striking member are shown;

[0020] Figure 4 is a schematic diagram of a bracket and a striking member according to an embodiment of the utility model;

[0021] Figure 5 It is a cross-sectional view of the striking member and the driving protrusion according to an embodiment of the utility model.

[0022] Reference numerals:

[0023] Rotary sintering furnace 1000;

[0024] Furnace body assembly 100; converter 1; driving protrusion 2; driving surface 3; limiting protrusion 4; insulation shell 5; furnace head 6;

[0025] Furnace tail 7; center horizontal plane S1; center vertical plane S2; first plane N1;

[0026] Striking member 200 ; connecting end 81 ; striking end 82 ; bracket 300 . DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments 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.

[0028] 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them, the first feature "above", "above" and "above" the second feature may include the first feature being directly above and diagonally above the second feature, or may simply mean that the first feature is at a higher level than the second feature.

[0030] The rotary sintering furnace is a thermal equipment for calcining, roasting or drying granular and powdered materials (such as precursors of lithium-ion battery cathode materials), with advantages such as combustion system, strong technical power, precise gas distribution, and low burn-out rate. However, when the rotary sintering furnace is used to manufacture lithium-ion battery cathode materials such as lithium iron phosphate, lithium iron manganese phosphate, lithium cobalt oxide, spinel nickel manganese oxide, lithium-rich manganese-based materials or nickel cobalt manganese oxide, it is found that the lithium-ion battery cathode materials are mixed with adhesive skin materials, and the content of impurities such as magnetic substances is too high, and the quality is poor. After research, the present application creatively discovered that during the sintering process of the positive electrode material precursor of the lithium-ion battery in the rotary sintering furnace, due to the inherent characteristics of the positive electrode material precursor of the lithium-ion battery, the material is easy to adhere to the inner wall of the converter or the spiral blades in the converter, affecting the temperature uniformity of the inner wall of the converter, causing the local temperature to be too high, that is, due to the adhesion of the material, the local sintering temperature of the converter is too high, making the material easy to react with the furnace wall material of the converter, thereby causing impurities to be carried in the product or overburned materials to exist, affecting the quality of the positive electrode material of the lithium-ion battery. Moreover, when the material adhered to the inner wall is sintered at high temperature for a long time, it is easy to form an over-sintered skin, that is, after the material adheres to the inner wall of the converter, the flaky solid formed by sintering or over-sintering is larger than the required particle size of the material, affecting the electrical properties of the positive electrode material of the lithium-ion battery such as the charge and discharge cycle, and cannot be used normally after recovery, causing waste and increasing production costs. At present, the inner wall of the converter is usually cleaned manually, but it is inconvenient for operators to enter the converter for cleaning, and the cleaning is too troublesome and dangerous. In addition, the cleaning needs to be done after sintering, when the bonded materials are more and thicker, making cleaning more difficult and the cleaning effect is poor.

[0031] To this end, the present invention provides a rotary sintering furnace 1000. When the rotary sintering furnace 1000 of the embodiment of the present application is used to sinter materials, the bonding skin material in the product can be reduced, the impurity content can be reduced, and the product quality can be improved.

[0032] The rotary sintering furnace 1000 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0033] Reference Figure 2-Figure 5As shown, the rotary sintering furnace 1000 according to the embodiment of the present invention may include: a furnace body assembly 100 , a bracket 300 and a striking piece 200 .

[0034] Specifically, the furnace assembly 100 includes a converter 1, and a driving protrusion 2 is provided on the outer peripheral surface of the converter 1. A bracket 300 is provided outside the converter 1, and the converter 1 rotates relative to the bracket 300. The knocking member 200 is movably mounted on the bracket 300 and is used to knock the converter 1. The knocking member 200 is a long plate-like structure, which has a connecting end 81 and a knocking end 82 arranged oppositely. The connecting end 81 is rotatably connected to the bracket 300, and the straight-line distance L1 between the connecting end 81 and the knocking end 82 is greater than the minimum distance L2 between the connecting end 81 and the outer peripheral surface of the converter 1.

[0035] Among them, the driving protrusion 2 rotates with the converter 1 and is in active contact with the knocking piece 200. When the driving protrusion 2 is in contact with the knocking piece 200, the driving protrusion 2 drives the knocking piece 200 to move around the rotation axis of the connecting end 81 to separate the knocking end 82 from the converter 1; and when the driving protrusion 2 is separated from the knocking piece 200, the knocking piece 200 can rotate around the rotation axis of the connecting end 81 at least under the action of gravity, so that the knocking end 82 moves toward the converter 1 to knock the converter 1.

[0036] The connecting end 81 is located above the central horizontal plane S1 of the converter 1 (i.e. the horizontal plane where the rotation axis of the converter 1 is located) and is located on the side of the central vertical plane S2 of the converter 1 (i.e. the vertical plane where the rotation axis of the converter 1 is located) opposite to the rotation direction of the converter 1. The plane where the rotation axis of the connecting end 81 and the rotation axis of the converter 1 are located is the first plane N1, and the knocking end 82 is located on the side of the first plane N1 along the rotation direction of the converter 1.

[0037] The radius of the converter 1 is R1, and the maximum protrusion height of the driving protrusion 2 along the radial direction of the converter 1 is R2, wherein:

[0038]

[0039] The present application proposes a preparation method, which uses a rotary sintering furnace to dynamically sinter a lithium-ion battery positive electrode material precursor to obtain a lithium-ion battery positive electrode material. The rotary sintering furnace can be the rotary sintering furnace 1000 according to the embodiment of the utility model. The preparation method according to the embodiment of the utility model is described below by taking the use of the rotary sintering furnace 1000 to prepare a lithium-ion battery positive electrode material as an example. Figure 1 As shown, the preparation method comprises the following steps:

[0040] S1: uniformly mixing the reaction raw materials and the solvent, grinding and spray drying to obtain a precursor of the positive electrode material for a lithium-ion battery;

[0041] S2: The positive electrode material precursor of the lithium-ion battery is continuously fed into the converter 1. Under the protection of the protective atmosphere, the positive electrode material precursor of the lithium-ion battery moves from the feeding end of the converter 1 to the discharging end of the converter 1 driven by the slow rotation of the converter 1 to perform high-temperature dynamic sintering. During the sintering, the knocking member 200 is separated from the converter 1 under the drive of the driving protrusion 2, and knocks on the converter 1 at least under the action of gravity, so that the positive electrode material precursor of the lithium-ion battery adhered to the inner wall of the converter 1 falls off.

[0042] S3: After sintering is completed, the material is discharged and crushed, screened and demagnetized to obtain the positive electrode material for lithium-ion batteries.

[0043] The converter 1 is used to calcine, roast or dry the internal material. For example, the internal material is a positive electrode material precursor for a lithium-ion battery. The positive electrode material precursor for a lithium-ion battery is sintered in the converter 1 to obtain a positive electrode material for a lithium-ion battery. Figure 2 As shown, the converter 1 is an integral cylindrical structure (but it is not required to be a whole cylinder, for example, it can be composed of multiple sections of cylinders rigidly connected), and the two ends of the converter 1 are respectively connected to the feed box and the discharge box. The furnace body assembly 100 also includes a heating device and a driving device, the heating device is used to heat the converter 1, and the driving device is used to drive the converter 1 to rotate. The material enters the converter 1 from the feed box, the heating device heats the converter 1 to heat the material in the converter 1, and the driving device drives the converter 1 to rotate. When the converter 1 rotates, the material in the converter 1 moves in the discharge direction and is discharged to the discharge box, so as to realize the calcination, roasting or drying of the material inside the converter 1.

[0044] In some embodiments, a spiral blade is provided in the converter 1, and the spiral blade rotates synchronously with the converter 1, so that when the converter 1 rotates, the rotation of the spiral blade pushes the material in the converter 1 to move in the discharge direction, and makes the material in the converter 1 more evenly mixed. The spiral blade can not only make the material in the converter 1 evenly mixed and drive the material to move in the discharge direction, but also make it difficult for large-area material adhesion to form on the inner wall of the converter 1, which is conducive to reducing the adhesion rate.

[0045] The bracket 300 is disposed outside the converter 1, so that the striking piece 200 installed on the bracket 300 is disposed outside the converter 1, so that the striking piece 200 will not directly contact the material in the converter 1, so as to avoid the striking piece 200 interfering with the material transportation and heating, so that the sintering work of the material in the converter 1 can proceed smoothly. In addition, the temperature in the converter 1 will not affect the work of the striking piece 200, which can improve the working stability of the striking piece 200. In addition, the bracket 300 and the converter 1 are independent of each other, and the striking piece 200 is easy to install and can be disassembled or replaced at any time according to actual conditions.

[0046] The striking member 200 of the long plate-like structure is conducive to simplifying the device structure, and has a simple structure and low production difficulty. Figure 3-Figure 4 As shown, the knocking member 200 is a rectangular plate-like structure, and the knocking member 200 includes two short sides that are oppositely arranged along the length direction and have equal lengths, and two long sides that are oppositely arranged along the width direction and have equal lengths, and the ends of the two short sides are respectively formed as a connecting end 81 and a knocking end 82, that is, the connecting end 81 and the knocking end 82 are oppositely arranged along the length direction of the knocking member 200. The connecting end 81 can be rotatably connected to the bracket 300 by means of hinges, for example, the connecting end 81 is sleeved on the bracket 300 and the connecting end 81 is driven to rotate by a rotating shaft.

[0047] The driving protrusion 2 is in active contact with the knocking member 200, that is, the driving protrusion 2 and the knocking member 200 have two states of contact and separation, so that the knocking member 200 and the converter 1 have two states of contact and separation. Figure 3 As shown, the knocking member 200 is in contact with the converter 1, and the outer peripheral surface of the converter 1 is provided with a driving protrusion 2, which can rotate with the converter 1 and contact with the knocking member 200 to push the knocking member 200 to move, so that the knocking member 200 is separated from the converter 1, and the converter 1 continues to rotate to enable the driving protrusion 2 to continue to rotate, so that the driving protrusion 2 is separated from the knocking member 200. The separation of the knocking member 200 from the driving protrusion 2 causes the knocking member 200 to move (for example, rotate) toward the converter 1 relative to the bracket 300, and the knocking member 200 moves toward the converter 1 to knock the converter 1, which can more effectively knock off the materials adhered to the inner wall of the converter 1.

[0048] The straight-line distance L1 between the connecting end 81 and the knocking end 82 is made greater than the minimum distance L2 between the connecting end 81 and the outer peripheral surface of the converter 1, that is, the radial length of the knocking piece 200 is long enough so that the knocking end 82 can contact and knock the outer peripheral surface of the converter 1 when the knocking piece 200 moves toward the converter 1, which is beneficial to improve the reliability of the knocking end 82 knocking the converter 1.

[0049] For example, in some embodiments, Figure 3-Figure 4As shown, the connecting end 81 is rotatably mounted on the bracket 300, so that the knocking end 82 can rotate freely relative to the bracket 300, and the knocking end 82 can be detachably overlapped on the outer peripheral surface of the converter 1. The driving protrusion 2 contacts and pushes the knocking end 82 as the converter 1 rotates, so that the knocking end 82 rotates relative to the bracket 300, and the knocking end 82 is separated from the converter 1. The driving protrusion 2 continues to rotate with the converter 1 to push the knocking member 200 to continue to rotate, increasing the distance between the knocking end 82 and the outer peripheral surface of the converter 1. The driving protrusion 2 continues to rotate with the converter 1, increasing the distance between the driving protrusion 2 and the knocking member 200. When the distance is too large, the driving protrusion 2 is separated from the knocking member 200, and then the knocking end 82 rotates relative to the bracket 300 at least under the action of gravity and falls to the outer peripheral surface of the converter 1 to knock the converter 1.

[0050] The knocking member 200 knocks the converter 1 at least under the action of gravity. The knocking member 200 knocks the converter 1 by using gravity, which is easy to implement and can reduce the number of other parts used to drive the knocking member 200 to move, which is conducive to simplifying the structure. For example, the knocking member 200 is located above the central horizontal plane S1 of the converter 1 (i.e., the horizontal plane where the rotation axis of the converter 1 is located), so that the knocking member 200 moves downward under its own gravity to approach and knock the converter 1.

[0051] Through the cooperation between the knocking piece 200 and the driving protrusion 2, the knocking piece 200 can automatically knock the converter 1 as the converter 1 rotates to clean the materials adhered to the inner wall of the converter 1. There is no need to add other parts to drive the knocking work of the knocking piece 200, which is conducive to simplifying the structure.

[0052] The connecting end 81 is located above the central horizontal plane S1 of the converter 1 and on the side of the central vertical plane S2 of the converter 1 opposite to the rotation direction of the converter 1. The plane where the rotation axis of the connecting end 81 and the rotation axis of the converter 1 are located is the first plane N1, and the knocking end 82 is located on the side of the first plane N1 along the rotation direction of the converter 1.

[0053] Among them, the side of the first plane N1 along the rotation direction of the converter 1 can be understood as that the two sides of the first plane N1 are respectively one side along the rotation direction of the converter 1 and one side against the rotation direction of the converter 1. Any point on the converter 1 will rotate from the side against the rotation direction of the converter 1 through the first plane N1 to the side along the rotation direction of the converter 1 as the converter 1 rotates. The side of the first plane N1 along the rotation direction of the converter 1 is the side of the first plane N1 along the rotation direction of the converter 1. For example, in some specific embodiments, such as Figure 3 As shown, the converter 1 rotates clockwise, the left side of the first plane N1 at the knocking member 200 is the side opposite to the rotation direction of the converter 1, the right side of the first plane N1 is the side along the rotation direction of the converter 1, and the knocking end 82 is located on the right side of the first plane N1.

[0054] The knocking piece 200 can fall and knock the converter 1 as the converter 1 rotates, thereby improving the working reliability of the knocking piece 200. The positions of the connecting end 81 and the knocking end 82 are defined so that the knocking piece 200 is formed as an inclined plate-like structure as a whole, and the center of gravity of the knocking piece 200 is offset relative to the central vertical plane S2 in a direction perpendicular to the central vertical plane S2, which is conducive to reducing the resistance when the driving protrusion 2 moves with the converter 1 and pushes the knocking piece 200 to move upward, that is, reducing the resistance to the converter 1 in the process of the knocking piece 200 passing through the driving protrusion 2 away from the converter 1, avoiding affecting the rotation of the converter 1, and achieving effective knocking of the converter 1.

[0055] For example, in some embodiments, Figure 3 As shown, the connection end 81 is located on the upper side of the central horizontal plane S1 and on the left side of the central vertical plane S2. The converter 1 rotates clockwise, and the striking member 200 is located on the side of the central vertical plane S2 opposite to the rotation direction of the converter 1, which is conducive to the striking end 82 contacting and striking the converter 1 under the action of gravity after the striking end 82 is separated from the driving protrusion 2. Some embodiments in which the converter 1 rotates counterclockwise are similar to the above, and the installation position and size requirements of the striking member 200 can be changed accordingly according to the rotation direction of the converter 1, which will not be repeated here.

[0056] The knocking piece 200 knocking the outer peripheral surface of the converter 1 can more effectively knock off the material stuck to the inner wall of the converter 1. In particular, the knocking position of the knocking end 82 is close to the top of the converter 1 or even the knocking end 82 knocks directly above the converter 1, that is, the top. When the knocking end 82 knocks the top of the converter 1 downward, the knocking force on the converter 1 is greater, and the cleaning effect on the material stuck to the inner wall of the converter 1 is stronger, which can make the material on the inner wall of the top of the converter 1 easier to fall off, thereby improving the cleaning efficiency.

[0057] The radius of the converter 1 is R1, and the maximum protrusion height of the driving protrusion 2 along the radial direction of the converter 1 is R2, wherein:

[0058]

[0059] In the above definition, when L1 is equal to the above critical value When L1 is greater than the critical value, the line A between the connecting end 81 and the central axis of the converter 1, the line B between the maximum protrusion height of the driving protrusion 2 and the central axis of the converter 1, and the section C of the striking member 200 perpendicular to its own rotation axis form a right triangle, that is, when the driving protrusion 2 pushes the striking member 200 to move upward to the highest position, the driving protrusion 2 separates from the striking member 200, so that the striking member 200 moves toward the converter 1 to strike the converter 1. When L1 is greater than the critical value That is, the length of the striking piece 200 is too large, so that the striking piece 200 has not separated from the driving protrusion 2 after moving to the highest point, and the height drops back with the further movement of the driving protrusion 2. The useless work done in the falling process causes energy waste. After separating from the driving protrusion 2, the striking impulse generated by gravity is reduced and the striking force is weakened.

[0060] Through the above definition, in the process of the driving protrusion 2 driving the knocking piece 200 to rise, the driving protrusion 2 can be separated from the knocking piece 200 when the knocking end 82 rises to the highest point, and the knocking end 82 starts to fall freely from the highest point, and the entire falling process is effectively used for knocking, which reduces energy consumption. When the height of the driving protrusion 2 is constant, it can ensure that the knocking piece 200 maximizes the use of the driving force generated by the rotation of the converter 1 and moves upward in the vertical direction, so as to convert the gravitational potential energy into a knocking impulse, thereby ensuring the knocking effect, and achieving the best knocking effect on the converter 1 when the height of the driving protrusion 2 is constant and the length of the knocking piece 200 is as short as possible, and can avoid energy waste and reduce the impact on the rotation of the converter 1.

[0061] Specifically, the striking end 82 can fall toward the converter 1 under the action of gravity, which makes it easy to strike the converter 1, and the striking end 82 can move upward under the action of the driving protrusion 2 without being stuck by the driving protrusion 2, which is beneficial to improving the reliability of the striking piece 200 striking the converter 1 and the smoothness of the rotation of the converter 1.

[0062] For example, in some specific embodiments, Figure 3 As shown, the connecting end 81 of the knocking piece 200 is located at the upper left of the converter 1, so that the knocking end 82 can knock the area directly above or in the vicinity of the converter 1, and the gravity of the knocking piece 200 is maximized and converted as much as possible into the knocking force on the converter 1. Under the condition of the same gravitational potential energy, the weight requirement for the knocking piece 200 is lower, which makes it convenient to set the knocking piece 200 as a long plate-like structure with lighter gravity, and to convert more of the gravitational potential energy into the knocking force on the converter 1, thereby achieving a better cleaning effect on the converter 1.

[0063] After sintering, the material adhered to the inner wall of the converter 1 is more and thicker, and the cleaning process of the knocking piece 200 can be carried out simultaneously with the sintering process instead of having to be carried out after sintering, which is conducive to timely cleaning before the material adhered to the inner wall of the converter 1 accumulates more and thicker, further reducing the cleaning difficulty and improving the cleaning effect. In other words, the material adhered to the inner wall of the converter 1 during the sintering process is less than that after sintering, and it is easy to knock off, the cleaning difficulty is less, and the cleaning effect is higher.

[0064] In addition, the cleaning process does not require manual assistance, which helps reduce the cost of manual cleaning and simplifies the difficulty of cleaning the materials adhered to the inner wall of the converter 1.

[0065] It is worth noting that the bonded materials will be mixed with the materials in the converter 1 after being knocked off, and will be screened synchronously after being discharged, and those meeting the particle size requirements will be used normally as products. By knocking off the bonded materials in time during the sintering process by the knocking piece 200, the sintered skin can be reduced, thereby reducing waste, reducing production costs, and improving product quality.

[0066] By using the preparation method of the present application, during the process of preparing positive electrode materials for lithium-ion batteries, the materials stuck in the converter 1 can be knocked off in time by knocking the converter 1 with the knocking piece 200, thereby improving the temperature uniformity of the inner wall of the converter 1 during the preparation process, reducing the possibility of reaction between the materials and the furnace wall materials, and improving the problems of impurities or overburned materials in the positive electrode materials for lithium-ion batteries, thereby improving the quality of the prepared positive electrode materials for lithium-ion batteries. The knocking piece 200 can automatically knock the converter 1 as the converter 1 rotates, and there is no need to add other components to drive the knocking work of the knocking piece 200, which is conducive to simplifying the structure and is easy to implement. In addition, the cleaning process does not require manual assistance or manual cleaning, thereby reducing the cost of manual cleaning.

[0067] According to the preparation device 1000 of the embodiment of the utility model, the knocking piece 200 can knock on the converter through the cooperation with the driving protrusion 2, which is conducive to timely knocking off the material stuck in the converter 1, improving the temperature uniformity of the inner wall of the converter 1, reducing the possibility of reaction between the material and the furnace wall material, and improving the problem of carrying impurities or overburned materials in the product, thereby improving product quality. The knocking piece 200 can automatically knock on the converter 1 as the converter 1 rotates, and there is no need to add other components to drive the knocking work of the knocking piece 200, which is conducive to simplifying the structure and is easy to implement. The cleaning process does not require manual assistance or manual cleaning, thereby reducing the cost of manual cleaning.

[0068] In some embodiments, Figure 3 As shown, the swing angle α of the knocking piece 200 can be limited according to factors such as the installation position of the knocking piece 200, the material of the knocking piece 200, the strength of the knocking piece 200, the material of the converter 1, the strength of the converter 1, the rotation direction of the converter 1, the rotation rate of the converter 1, the working time of the converter 1, etc. The swing angle α is the movement swing angle of the knocking end 82 relative to the connecting end 81 during the movement of the knocking piece 200.

[0069] By controlling the swing angle α of the knocking piece 200, the movement range of the knocking end 82 relative to the connecting end 81 can be controlled, and then the movement range of the knocking end 82 relative to the converter 1 can be controlled, which is beneficial for making the knocking position of the knocking end 82 close to the top of the converter 1, and can control the knocking force of the knocking end 82 on the converter 1, so that the knocking force is not too large to reduce damage to the converter 1, which is beneficial for protecting the converter 1, and the knocking force is not too small to increase the possibility of the bonding material falling off, which is beneficial for improving the cleaning effect.

[0070] In some embodiments, the knocking frequency of the knocking member 200 is 1 time / 5s-5min, and the knocking frequency of the knocking member 200 is related to the number of driving protrusions 2, the rotation speed of the converter 1, etc., so that the knocking frequency of the knocking member 200 is 1 time / 5s-5min, which is conducive to timely knocking off the bonding materials in the converter 1 and is not easy to damage the converter 1 due to too high a frequency. For example, knock once every 5s, or knock once every 3min, or knock once every 5min, etc.

[0071] In some embodiments, the axially extending dimension of the knocking piece 200 is 140-160 mm, the thickness is 15-25 mm, L1 is 380-390 mm, the weight is 8-10 kg, and the knocking impulse is 6.5-7.5 kg·m / s. It can reduce the required installation space and damage to the converter 1 while ensuring the knocking force, and the knocking reliability is good.

[0072] In some embodiments of the utility model, the rotary sintering furnace 1000 is used in the preparation of positive electrode materials for lithium-ion batteries to dynamically sinter the raw materials. The positive electrode materials for lithium-ion batteries include lithium iron phosphate, lithium iron manganese phosphate, lithium cobalt oxide, spinel lithium nickel manganese oxide, lithium-rich manganese-based materials or lithium nickel cobalt manganese oxide. Among them, the positive electrode materials for lithium-ion batteries include one of lithium iron phosphate, lithium iron manganese phosphate, lithium cobalt oxide, spinel lithium nickel manganese oxide, lithium-rich manganese-based materials, and lithium nickel cobalt manganese oxide. The positive electrode material precursor of lithium-ion batteries is prone to adhesion or even over-sintering during the sintering process. The preparation method of the utility model is used to sinter the positive electrode material precursor of lithium-ion batteries, and the bonded materials can be knocked off in time, reducing the bonding rate of the positive electrode material precursor of lithium-ion batteries during the sintering process and the possibility of over-sintering, which is conducive to fully sintering the positive electrode material precursor of lithium-ion batteries, reducing the waste of the positive electrode material precursor of lithium-ion batteries, and improving the quality of the positive electrode material of lithium-ion batteries.

[0073] In some embodiments, the positive electrode material of the lithium-ion battery is lithium iron phosphate, and the reaction raw materials include iron phosphate, a lithium source, and a carbon source. The lithium source is any one of lithium carbonate, lithium hydroxide, lithium nitrate, lithium oxalate, or lithium acetate, or a combination of at least two of them. There are many types of reaction raw materials, and it is easy to obtain the reaction raw materials to obtain a lithium-ion battery positive electrode material precursor and then prepare a lithium-ion battery positive electrode material.

[0074] In some embodiments, the carbon source is any one of glucose, sucrose, and polyethylene glycol, or a combination of two or more thereof. There are many types of reaction raw materials, and it is easy to obtain the reaction raw materials to obtain a lithium-ion battery positive electrode material precursor and then prepare a lithium-ion battery positive electrode material.

[0075] In some embodiments, the rotation rate of the converter 1 is 3 to 8 r / h, the sintering heating rate is 2 to 20°C / min, the sintering temperature is 700 to 800°C, and the sintering time is 6 to 18h, which is conducive to fully sintering the lithium-ion battery positive electrode material precursor in the converter 1, reducing the waste of the lithium-ion battery positive electrode material precursor, and improving the quality of the lithium-ion battery positive electrode material.

[0076] For example, the rotation rate of converter 1 is 3r / h, 5r / h, 8r / h, etc., the sintering heating rate is 2℃ / min, 10℃ / min, 20℃ / min, etc., the sintering temperature is 700℃, 750℃, 800℃, etc., and the sintering time is 6h, 10h, 18h, etc.

[0077] In some embodiments of the present invention, the rotary sintering furnace 1000 further includes an elastic member, which abuts against the knocking member 200 and applies an elastic force toward the converter 1 to the knocking member 200 to drive the knocking member 200 to knock the converter 1. The elastic force of the elastic member and the gravity of the knocking member 200 cooperate to apply a force toward the converter 1 to the knocking member 200, thereby increasing the knocking force of the knocking member 200 and thereby increasing the cleaning effect on the bonding material. For example, the knocking member 200 is located above the horizontal plane S1 at the center of the converter 1, and the elastic member applies a downward elastic force to the knocking member 200 and, combined with the gravity of the knocking member 20, causes the knocking member 200 to move downward to approach and knock the converter 1. The elastic member may be an elastic member such as a spring.

[0078] In some embodiments, Figure 3 As shown, the surface of the driving protrusion 2 along the rotation direction of the converter 1 includes a driving surface 3, the driving surface 3 is used to contact the striking end 82 and drive the striking piece 200 to rotate, and the driving surface 3 is inclined close to the central axis of the converter 1 along the rotation direction of the converter 1. The striking piece 200 is driven to rotate by the driving surface 3, which is conducive to increasing the area of ​​the driving protrusion 2 used to drive the striking piece 200, so that the driving surface 3 and the striking piece 200 are not easily separated during the driving process, and the driving of the driving protrusion 2 to the striking piece 200 is more stable.

[0079] The driving surface 3 is inclined along the rotation direction of the converter 1 close to the central axis of the converter 1, so that the knocking member 200 can be gradually driven to rotate through the inclined surface during the rotation of the converter 1, and the rotation of the knocking member 200 is driven to be smoother, and the wear of the driving protrusion 2 and the knocking member 200 is reduced, so that the knocking process is not easy to get stuck. For example, in some specific embodiments, Figure 3 As shown, the converter 1 rotates clockwise, and the driving surface 3 is inclined rightward and downward.

[0080] The central axis of the converter 1 is the rotation axis of the converter 1. For example, the central axis of the converter 1 extends along the length direction of the converter 1. For example, in some specific embodiments, Figure 2 As shown, the central axis of the converter 1 extends in the front-rear direction. The driving surface 3 can be a plane or a curved surface, which is not limited in the present invention, as long as the driving surface 3 can drive the striking member 200 to rotate.

[0081] In some embodiments, Figure 5 As shown, the driving surface 3 is provided with limiting convex parts 4 on both sides of the axial direction of the converter 1, and the striking end 82 is located between the two limiting convex parts 4. The two limiting convex parts 4 can limit the movement of the striking end 82 in the axial direction, reduce the possibility of the striking end 82 being away from the driving surface 3 in the axial direction, and help to keep the contact between the striking end 82 and the driving surface 3, and can make the position of the connecting end 81 at the bracket 300 not skew, so that the rotation connection between the connecting end 81 and the bracket 300 is smoother and not stuck, which is convenient for the knocking member 200 to knock the converter 1 to clean up.

[0082] In some embodiments, the radial height of the driving protrusion 2 can be flexibly set according to the material and strength of the converter 1, so that the driving protrusion 2 can contact and push the knocking piece 200 and is not easy to cause large impact and other damage to the converter 1. For example, the radial height of the driving protrusion 2 is 120-130 mm.

[0083] In some embodiments of the utility model, a pad is provided on the outer peripheral surface of the converter 1, and the striking piece 200 acts on the converter 1 by striking the pad, and the contact area between the pad and the converter 1 is larger than the contact area between the striking piece 200 and the pad. The pad between the striking piece 200 and the converter 1 can provide a buffer for the striking force of the striking piece 200 striking the converter 1, so that the striking piece 200 strikes the pad and transmits the striking force to the converter 1 through the pad, thereby reducing the direct impact force on the outer peripheral surface of the converter 1, reducing the possibility of scratches or even deformation on the outer peripheral surface of the converter 1, and reducing the self-damage caused by the striking piece 200 directly striking the converter 1 for a long time, which is beneficial to protecting the converter 1 and the striking piece 200.

[0084] In addition, by making the contact area between the pad and the converter 1 larger than the contact area between the knocking piece 200 and the pad, the knocking force of the knocking piece 200 can be dispersed to a larger area of ​​the outer peripheral surface of the converter 1, thereby increasing the knocked area of ​​the converter 1, facilitating the cleaning of materials in a larger area of ​​the inner wall of the converter 1 and improving the cleaning efficiency.

[0085] In some embodiments, the gasket is made of the same material as the converter 1 , which can reduce the possibility of the converter 1 corroding due to excessive temperature of the converter 1 reacting with the gasket during operation, thereby protecting the converter 1 .

[0086] In some embodiments, the driving protrusion 2 is disposed on the cushion block, which can increase the contact area between the cushion block and the converter 1, increase the knocking area of ​​the knocking member 200 on the converter 1 through the cushion block, and improve the cleaning efficiency.

[0087] In addition, arranging the driving protrusion 2 on the pad instead of the converter 1 can reduce the processing technology performed on the converter 1 (such as welding the driving protrusion 2 to the converter 1), and the driving protrusion 2 is installed on the converter 1 through the pad, which makes the installation of the driving protrusion 2 convenient. The driving protrusion 2 can be repaired or replaced on the pad according to actual conditions without processing the converter 1, which is beneficial to protecting the converter 1.

[0088] In some embodiments, the cushion block is arc-shaped to adapt to the outer peripheral surface shape of the converter 1, reduce the possibility of separation of the cushion block from the converter 1, and improve the connection reliability between the cushion block and the converter 1.

[0089] In some embodiments, the axial dimension of the cushion block is 140-150 mm, and the thickness is 10-20 mm, which is beneficial for increasing the striking area while reducing the burden of the cushion block on the converter 1, thereby facilitating the normal rotation of the converter 1.

[0090] In some embodiments of the present invention, Figure 3 As shown, the outer circumferential surface of the converter 1 is provided with a plurality of driving protrusions 2, and the plurality of driving protrusions 2 corresponding to the same knocking member 200 are arranged at intervals along the circumference of the converter 1, and the plurality of driving protrusions 2 rotate with the converter 1 and drive the knocking member 200 to move in turn.

[0091] The plurality of driving protrusions 2 can cooperate with the plurality of knocking members 200 to knock more areas of the converter 1 in the axial direction. The plurality of driving protrusions 2 arranged in the circumferential direction can knock more areas of the converter 1 in the circumferential direction. Combining the plurality of knocking members 200 arranged in the axial direction and the plurality of driving protrusions 2 arranged in the circumferential direction, it is possible to knock more areas of the converter 1 in the axial direction and in the circumferential direction, thereby increasing the knocking range and improving the cleaning efficiency.

[0092] And the multiple driving protrusions 2 corresponding to the same knocking piece 200 rotate with the converter 1 and drive the knocking piece 200 to move in turn. That is, only one knocking piece 200 is required in each axial area of ​​the converter 1 to cooperate with the multiple driving protrusions 2 arranged along the circumferential direction to achieve knocking in more circumferential areas, which is beneficial to increase the cleaning range while reducing the number of knocking pieces 200 required, and has better economy.

[0093] For example, in some specific embodiments, the outer circumferential surface of the converter 1 is provided with six driving protrusions 2 and two knocking members 200, and every three driving protrusions 2 cooperate with one knocking member 200, and the three driving protrusions 2 cooperated with the same knocking member 200 are arranged at intervals along the circumference of the converter 1, and the three driving protrusions 2 cooperated with the same knocking member 200 rotate with the converter 1 and drive the knocking member 200 to move in sequence. Through the six driving protrusions 2 and the two knocking members 200, two axial areas of the converter 1 can be knocked, and more specifically, three areas along the circumferential direction of each of the two areas can be knocked, thereby increasing the knocking range and improving the cleaning efficiency.

[0094] In some embodiments of the present invention, Figure 2 As shown, the furnace assembly 100 further includes an insulation shell 5, the converter 1 is rotatably disposed in the insulation shell 5, and the furnace head 6 and furnace tail 7 of the converter 1 are respectively located outside the insulation shell 5. By providing the insulation shell 5, heat loss can be reduced, which is beneficial to ensuring a high heat environment of the converter 1 and improving sintering efficiency.

[0095] In some embodiments, the furnace body assembly 100 also includes multiple heating devices, which include multiple electric heaters arranged side by side along the axial direction. The electric heaters are arranged between the insulation shell 5 and the converter 1 to heat the converter 1. The insulation shell 5 can effectively reduce heat loss, so that the heat can be fully used to heat the converter 1, thereby improving heat utilization and reducing sintering costs.

[0096] In some embodiments, the total length of the converter 1 is less than 15m, and the converter 1 is a whole cylinder without obvious segments, so it is convenient to set up a whole insulation shell 5 to cover the other parts of the converter 1 except the furnace head 6 and the furnace tail 7, which has a better insulation effect on the converter 1.

[0097] It is worth noting that the composition of the insulation shell 5 is not limited. For example, the insulation shell 5 may include a metal shell and an insulation layer arranged on the inner wall of the metal shell, such as insulation bricks, insulation cotton, etc., so as to more effectively lock heat in the insulation shell 5 and reduce heat waste.

[0098] In some embodiments, a knocking piece 200 is correspondingly provided at at least one location of the furnace head 6 and the furnace tail 7, and the furnace head 6 and the furnace tail 7 are respectively located outside the insulation shell 5, that is, the knocking piece 200 is provided outside the insulation shell 5, so that the setting position of the knocking piece 200 is not easily affected by the high temperature inside the insulation shell 5, and because the knocking piece 200 is placed outside the insulation shell 5, it is easy to install and maintain the knocking piece 200.

[0099] In some embodiments, Figure 2 As shown, the knocking piece 200 knocks the converter 1 at least under the action of gravity, and the knocking piece 200 is at least partially located in the insulation shell 5. The high temperature environment has little effect on the knocking work of the knocking piece 200 under the action of gravity, so that the knocking work of the knocking piece 200 is less negatively affected by the high temperature environment in the insulation shell 5, and the normal working state of the knocking piece 200 can be guaranteed while the knocking piece 200 is at least partially located in the insulation shell 5, which is conducive to increasing the position range where the knocking piece 200 can be set, increasing the knocking range of the knocking piece 200, and improving the knocking cleaning efficiency.

[0100] Specifically, the knocking piece 200 can be entirely arranged in the insulation shell 5 or partially arranged in the insulation shell 5. For example, the knocking end 82 of the knocking piece 200 is arranged in the insulation shell 5 and the connecting end 81 is arranged outside the insulation shell 5, so as to realize the knocking of the converter 1. The setting position of the knocking piece 200 is relatively flexible and has good practicality.

[0101] For example, in some embodiments, the knocking piece 200 knocks the converter 1 under the action of gravity and other mechanical devices such as springs, without involving devices such as electronic control that are greatly affected by high temperatures, so that the knocking work of the knocking piece 200 is less affected by the high temperature environment, which is conducive to placing at least part of the knocking piece 200 in the insulation shell 5.

[0102] For example, in some embodiments, the bracket 300 and the knocking member 200 are both disposed between the insulation shell 5 and the converter 1. In another example, in some embodiments, the bracket 300 is disposed outside the insulation shell 5, and the insulation shell 5 is provided with a through hole, so that the knocking member 200 mounted on the bracket 300 can be disposed between the insulation shell 5 and the converter 1 through the through hole portion, for example, the knocking end 82 of the knocking member 200 is disposed inside the insulation shell 5 and the connecting end 81 is disposed outside the insulation shell 5, which is conducive to the knocking member 200 contacting and knocking the converter 1.

[0103] In some embodiments, the knocking piece 200 can be partially disposed in the insulation shell 5, or can be entirely disposed in the insulation shell 5, so that the knocking piece 200 can be disposed at any position along the axial direction of the converter 1, and the knocking range is wider, which is conducive to knocking and cleaning a wider range of bonding materials in the converter 1.

[0104] In some embodiments, the insulation shell 5 can be separated into multiple temperature zones spaced apart along the axial direction by insulation materials, each temperature zone can be provided with at least one electric heater, and each electric heater can be independently controlled by a programmable logic controller (PLC), so as to achieve different heating temperatures in each temperature zone. For example, multiple temperature zones constitute a heating section, a heat preservation section, and a cooling section, and at least one knocking member 200 can be provided in both the heating section and the heat preservation section with a higher temperature (for example, a temperature higher than a certain value), or at least one knocking member 200 can be provided in each of the heating section, the heat preservation section, and the cooling section, so that knocking work in different temperature zones can be achieved, and the cleaning efficiency of the entire converter 1 is high.

[0105] In some embodiments, the furnace head 6, the inside of the insulation shell 5, and the furnace tail 7 are all provided with knocking pieces 200, which is beneficial to increase the knocking range of the converter 1 and improve the cleaning efficiency.

[0106] In some embodiments of the present invention, the polishing degree Ra of the furnace cavity wall surface of the converter 1 is less than or equal to 3 μm, so that the furnace cavity wall surface of the converter 1 is relatively smooth, which is conducive to reducing the bonding rate of the material. For example, the polishing degree Ra is 0.2 μm, 0.8 μm, 1.2 μm, 3 μm, etc. Especially for lithium-ion battery positive electrode materials, making the furnace cavity wall surface polishing degree Ra of the converter 1 less than or equal to 3 μm has a better effect of reducing the bonding rate of lithium-ion battery positive electrode materials during the sintering process.

[0107] In some embodiments of the utility model, the material of the converter 1 is stainless steel or alloy, so that the converter 1 has good high temperature resistance, which is conducive to the smooth progress of high temperature sintering work and has good economy. For example, the material of the converter 1 can be selected from 304 stainless steel, 310S stainless steel, Inconel601 / 625 alloy, etc., which have 1000-1200°C or higher temperature resistance, and have excellent stainless corrosion resistance and good intergranular corrosion resistance, which can effectively improve the introduction of magnetic substances into the positive electrode material of the lithium ion battery during the high temperature sintering process.

[0108] In some embodiments, the material of the bracket 300 may be stainless steel or alloy, so that the bracket 300 has a higher strength, which is conducive to maintaining the installation stability of the striking member 200 installed on the bracket 300. For example, the material of the bracket 300 is steel.

[0109] Other structures and operations of the rotary sintering furnace 1000 according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.

[0110] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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.

[0111] In the description of this specification, the description with reference to the terms "embodiment", "specific embodiment", "example", etc. 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 utility model. 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0112] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate 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 rotary sintering furnace, characterized in that: include: A furnace body assembly, the furnace body assembly comprising a converter, the outer peripheral surface of the converter being provided with a driving convex portion; A support, wherein the support is arranged outside the converter, and the converter rotates relative to the support; A knocking piece, which is movably mounted on the bracket and used to knock the converter, is a long plate-shaped structure, having a connecting end and a knocking end that are relatively arranged, the connecting end is rotatably connected to the bracket, and a straight-line distance L1 between the connecting end and the knocking end is greater than a minimum distance L2 between the connecting end and the outer peripheral surface of the converter, wherein, The driving protrusion rotates with the converter and is in active contact with the knocking member. When the driving protrusion is in contact with the knocking member, the driving protrusion drives the knocking member to move around the rotation axis of the connecting end so that the knocking end is separated from the converter; and when the driving protrusion is separated from the knocking member, the knocking member is adapted to rotate around the rotation axis of the connecting end at least under the action of gravity so that the knocking end moves toward the converter to knock the converter. The connecting end is located above the central horizontal plane of the converter and on the side of the central vertical plane of the converter opposite to the rotation direction of the converter, the plane where the rotation axis of the connecting end and the rotation axis of the converter are located is a first plane, and the knocking end is located on the side of the first plane along the rotation direction of the converter; The radius of the converter is R1, and the maximum protrusion height of the driving protrusion along the radial direction of the converter is R2, wherein:

2. The rotary sintering furnace according to claim 1, characterized in that: The utility model further comprises an elastic member, wherein the elastic member abuts against the knocking member and applies an elastic force toward the converter to the knocking member, so as to drive the knocking member to knock the converter.

3. The rotary sintering furnace according to claim 1, characterized in that: The surface of the driving protrusion along the rotating direction of the converter includes a driving surface, which is used to contact the striking end and drive the striking piece to rotate. The driving surface is inclined along the rotating direction of the converter close to the central axis of the converter.

4. The rotary sintering furnace according to claim 1, characterized in that: A cushion block is provided on the outer peripheral surface of the converter, and the knocking piece acts on the converter by knocking the cushion block. The contact area between the cushion block and the converter is larger than the contact area between the knocking piece and the cushion block.

5. The rotary sintering furnace according to claim 4, characterized in that: The cushion block is made of the same material as the converter; and / or the driving protrusion is arranged on the cushion block.

6. The rotary sintering furnace according to claim 1, characterized in that: The outer circumferential surface of the converter is provided with a plurality of driving protrusions, and the plurality of driving protrusions corresponding to the same knocking member are arranged at intervals along the circumferential direction of the converter, and the plurality of driving protrusions rotate with the converter and drive the knocking member to move in turn.

7. The rotary sintering furnace according to any one of claims 1 to 6, characterized in that: The furnace body assembly further includes a heat-insulating shell, the converter is rotatably disposed in the heat-insulating shell, and the furnace head and furnace tail of the converter are respectively located outside the heat-insulating shell, wherein: The knocking piece is correspondingly provided at at least one of the furnace head and the furnace tail; and / or, The knocking member knocks the converter at least under the action of gravity, and the knocking member is at least partially located in the heat-insulating shell.

8. The rotary sintering furnace according to claim 1, characterized in that: The furnace cavity wall surface polishing degree Ra of the converter is less than or equal to 3 μm; and / or the converter is made of stainless steel or alloy.

9. The rotary sintering furnace according to claim 1, characterized in that: The rotary sintering furnace is used in the preparation of lithium ion battery positive electrode materials to dynamically sinter the raw materials.

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