Pole roll baking device

Abstract

The invention provides a pole roll baking device which comprises a baking oven and an air outlet array, the cross section of the air outlet array in the pole roll in-out direction is in an annular shape, and the air outlet array extends inwards to the back face of the baking oven from a door opening and closing position of the baking oven in the pole roll in-out direction and does not make contact with the back face of the baking oven. The air outlet array is used for providing hot air to blow the outer surface of the pole roll, the air outlet array is used for providing hot air to blow the outer surface of the pole roll, and the heating rod is arranged in the center of the baking area in the in-out direction of the pole roll. The heating rod is used for hanging a pole roll and providing a contact heat source for the roll center of the pole roll. Hot air blown out of the air outlet array is used for blowing the surface of the pole roll, the outer surface of the pole roll is heated through heat conduction, the heating rod is used for heating the roll center of the pole roll in a contact type heating mode, and the two ways are used at the same time so that moisture contained in the pole roll in the winding state can be rapidly evaporated; and the baking efficiency and the baking effect of the pole roll are further improved.

Description

Technical Field

[0001] The present invention generally relates to the field of lithium battery technology and more specifically to a pole coil baking device. Background Art

[0002] At present, there are two baking methods in the baking process of lithium battery cells: contact baking and air circulation baking. Common square cells have a relatively flat surface. When using the contact baking process, the surface of the square cells can fully contact the heating surface. Therefore, the contact process has a better baking effect for square cells. Therefore, for square cells, if the cost factor is not given priority, both contact baking and air circulation baking can be used according to the actual situation on site; however, when baking the pole roll of the battery cell, since the pole roll is cylindrical, if the contact baking is used, the outer surface of the pole roll cannot be better contacted with the heating surface, and the pole roll is very easy to loosen and scatter during frequent flipping. That is, considering the fact that it is not suitable for frequent movement, the pole roll can only be baked in an air circulation oven instead of the contact baking process; in terms of cost, compared with contact baking, the cost of the contact baking process is higher, and the cost of the air circulation baking process is greatly reduced, but in terms of efficiency, the baking efficiency of the air circulation baking is lower than that of the contact baking.

[0003] The oven used in the existing air circulation baking process needs to place the cell pole coil into the baking chamber of the oven during baking, and the hot air enters the baking chamber from one side of the baking chamber, flows through the outer surface of the pole coil, and then flows back from the other side opposite to the aforementioned side and enters the baking chamber again after reheating to form a hot air cycle. The baking process corresponding to this type of oven mainly utilizes the principle of thermal convection, so it is necessary to actively increase the temperature in the baking chamber as a whole to form a favorable baking environment; secondly, when the hot air flows inside the baking chamber, the temperature of the hot air in various places in the baking chamber cannot be kept uniform, resulting in the baking effect within the preset baking time being less than expected, so that the baking time needs to be extended to reduce the water content of the pole coil; at the same time, due to the structural characteristics of the pole coil itself, the surface and the core of the pole coil are heated differently during baking, resulting in insufficient baking of the core of the pole coil, and the baking time also needs to be extended, which obviously brings higher costs and reduces the baking efficiency. The energy consumption of the oven used in the existing air circulation baking process still accounts for a large proportion of the total process cost, and is not even lower than the energy consumption of the contact oven.

[0004] In view of this, there is an urgent need to provide a pole roll baking device to solve the problem. Summary of the invention

[0005] In order to at least solve one or more technical problems in the above-mentioned background technology, the present invention proposes a pole coil baking device. To this end, the present invention provides the following technical solutions.

[0006] The present invention discloses a pole roll baking device, comprising: an oven and an air outlet array located in the oven, wherein the cross section of the air outlet array along the pole roll inlet and outlet direction is annular, and the air outlet array extends inwardly from the opening and closing door of the oven to the back side of the oven along the pole roll inlet and outlet direction without contacting the back side of the oven, so as to divide the interior of the oven into a baking area located within the annular shape and a non-baking area located outside the annular shape, and a heating rod is provided at the center of the baking area along the pole roll inlet and outlet direction, and the air outlet array is used to provide hot air to blow the outer surface of the pole roll, and the heating rod is used to suspend the pole roll and provide a contact heat source for the core of the pole roll.

[0007] Preferably, the air outlet array includes a cylindrical fixing frame with two ends through, the heating rod is located in the cylindrical interior of the cylindrical fixing frame, and a plurality of air outlet components are provided on the cylindrical fixing frame, and the air outlet of each air outlet component is located in the radial direction of the cylindrical fixing frame and arranged toward the heating rod.

[0008] Preferably, the cylindrical fixing frame includes annular rings located at both ends thereof and a plurality of air ducts located on the virtual cylindrical generatrix of the cylindrical fixing frame, and each two adjacent air ducts are evenly spaced, and each air duct includes a first cavity for air intake and a second cavity for air return, and a plurality of through holes for air outlet are provided on the outer peripheral surface of the first cavity, and the through holes are used to set an air outlet component to supply air to the air outlet component, and a fixing is provided between the annular ring and the air duct.

[0009] Preferably, the two ends of the fixing member have a U-shaped groove and a circular opening respectively, the bottom of the U-shaped groove has an arc-shaped depression for fitting with the outer surface of the annular ring to fix the annular ring, and the circular opening is used to fix the air duct.

[0010] Preferably, the air outlet assembly is telescopically arranged relative to the air duct to adjust the distance between the air outlet of the air outlet assembly and the outer surface of the pole roll.

[0011] Preferably, a perforated arc plate is provided at the air outlet of the air outlet component, and barbs are provided on opposite sides of the perforated arc plate, the barbs are located in the long strip opening of the air outlet component, and the arc surface of the perforated arc plate is arranged toward the heating rod.

[0012] Preferably, the air outlet assembly has a shape of a trapezoidal platform, and a tubular connecting piece is provided on the top of the trapezoidal platform for connecting to the through hole of the air duct. The perforated arc plate is arranged at the bottom of the trapezoidal platform, and a steel wire rope is fixedly connected to the other side opposite to the arc surface of the perforated arc plate. The other end of the steel wire rope is wound around a knurled screw, and the knurled screw is screwed on the tubular connecting piece. It also includes a compression spring, and the two ends of the compression spring are respectively located at the top and bottom of the trapezoidal platform, so that the arc surface of the perforated arc plate located at the bottom of the trapezoidal platform faces the heating rod, and the curvature of the arc surface of the perforated arc plate can change with the tightening or relaxation of the steel wire rope.

[0013] Preferably, the heating rod is fixedly connected to the oven, and the cylindrical fixing frame is rotatably arranged relative to the heating rod.

[0014] Preferably, the heating rod is arranged on a mounting seat, and the mounting seat is fixedly connected to the back plate of the oven. The mounting seat has at least three connecting parts for being fixedly connected to the back plate of the oven, and the angles between each two adjacent connecting parts are equal. The air outlet array also includes a turntable, which is arranged on a side of the cylindrical fixing frame close to the back plate of the oven and is fixedly connected to the cylindrical fixing frame. The turntable is provided with arc-shaped avoidance grooves of the same number as the number of the connecting parts, and each connecting part passes through the arc-shaped avoidance groove and is fixedly connected to the back plate of the oven. It also includes a device for driving the turntable. A rotating drive motor and a drive shaft, the drive shaft passes through the back plate of the oven and is fixedly connected to the center of the turntable, a magnetic fluid sealing device is provided at the connection between the drive shaft and the back plate of the oven, the turntable rotates within a preset angle range so that each connection part reciprocates in the corresponding arc-shaped avoidance groove; a plurality of direct joints are provided on the back plate, the two ends of the direct joints are used to connect hoses, the air supply cavity and the return air cavity of the air duct are connected to the direct joints by the hoses, and the direct joints are connected to the air supply pipeline and the air return pipeline by the hoses.

[0015] Preferably, the heating rod comprises a solid body and a heat sink located on the outer surface of the solid body, and the outer surface of the heat sink is used for sleeve-mounting the winding core support of the pole coil.

[0016] The technical solution provided by this application may have the following beneficial effects: By utilizing the device described in the above-mentioned embodiments of the present invention and its multiple schemes, that is, the present invention can divide the oven into independent baking areas and non-baking areas by arranging an air outlet array in the oven, and arranging a heating rod in the center of the baking area. When baking the pole coil, the pole coil is hung on the heating rod in the baking area, and the hot air blown by the air outlet array is blown on the surface of the pole coil and the outer surface of the pole coil is heated by heat conduction. At the same time, the heating rod is used to generate heat and heat the core of the pole coil in a contact heating manner. That is, in the baking area, the outer surface and the core of the pole coil are heated at the same time, and a two-pronged approach is adopted to quickly evaporate the moisture contained in the pole coil in the wound form. Compared with the prior art, the baking efficiency and baking effect of the pole coil are effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 is a schematic diagram showing an embodiment of the present invention; Figure 2 is a three-dimensional diagram showing an air outlet array according to an embodiment of the present invention; Figure 3 is a schematic diagram showing a cylindrical fixing frame according to an embodiment of the present invention; Figure 4 It is shown Figure 3 A magnified image of point A; Explanation of the reference numerals in the accompanying drawings: 11, oven; 12, heating rod; 21, air outlet assembly; 31, annular ring; 32, air duct; 33, fixing piece; 61, arc-shaped plate with holes; 62, barb; 71, tubular connecting piece; 91, connecting part; 92, turntable; 920, arc-shaped avoidance groove; 93, driving shaft; 94, hose. DETAILED DESCRIPTION

[0018] Embodiments will now be described with reference to the accompanying drawings. It should be understood that for simplicity and clarity of explanation, reference numerals may be repeated in the accompanying drawings to indicate corresponding or similar elements where deemed appropriate. In addition, the present invention sets forth many specific details in order to provide a thorough understanding of the embodiments described herein. However, it will be appreciated by those of ordinary skill in the art that the embodiments described herein may be practiced without these specific details. In other cases, well-known methods, processes, and components are not described in detail to avoid obscuring the embodiments described herein. Moreover, the description should not be construed as limiting the scope of the embodiments described herein.

[0019] According to an embodiment of the present invention, a pole coil baking device is provided, referring to Figures 1 to 4, comprising: an oven 11 and an air outlet array located in the oven 11, the cross-section of the air outlet array along the in-and-out direction of the pole roll is annular, the air outlet array extends inward from the opening and closing door of the oven 11 to the back of the oven 11 along the in-and-out direction of the pole roll without contacting the back of the oven 11, so as to divide the interior of the oven 11 into a baking area located within the annular shape and a non-baking area located outside the annular shape, a heating rod 12 is provided at the center of the baking area along the in-and-out direction of the pole roll, the air outlet array is used to provide hot air to blow the outer surface of the pole roll, and the heating rod 12 is used to suspend the pole roll and provide a contact heat source for the core of the pole roll.

[0020] The cross-section of the air outlet array mentioned above in the direction of entry and exit of the pole roll is annular in shape, which is suitable for the cylindrical shape of the pole roll. It can make the hot air blown by the air outlet array reach the same distance on the surface of the pole roll, so that the temperature provided to the pole roll is more uniform when the heating difference is extreme.

[0021] The air outlet array mentioned above extends inward from the opening and closing door of the oven 11 to the back of the oven 11 along the direction of the pole coil entering and exiting, so that the pole coil is completely located in the baking area after entering the oven 11.

[0022] The present invention arranges an air outlet array in the oven 11 to separate the oven 11 into an independent baking area and a non-baking area, and arranges a heating rod 12 in the center of the baking area. When baking the pole coil, the pole coil is hung on the heating rod 12 in the baking area, and the hot air blown by the air outlet array is blown on the surface of the pole coil and the outer surface of the pole coil is heated by heat conduction. At the same time, the heating rod 12 is used to generate heat and heat the core of the pole coil in a contact heating manner. That is, in the baking area, the outer surface and the core of the pole coil are heated at the same time, and a two-pronged approach is taken to quickly evaporate the moisture contained in the wound pole coil.

[0023] It is easy to understand that the baking area and the non-baking area are only separated in space, and the two are not independent and enclosed spaces.

[0024] In one embodiment, the air outlet array includes a cylindrical fixing frame with two ends through, the heating rod 12 is located in the cylindrical interior of the cylindrical fixing frame, and a plurality of air outlet components 21 are provided on the cylindrical fixing frame, and the air outlet of each air outlet component 21 is located in the radial direction of the cylindrical fixing frame and is arranged toward the heating rod 12.

[0025] Obviously, the cylindrical fixing frame meets the restriction that the cross-section of the air outlet array in the direction of entry and exit of the pole roll is annular. The air outlet assembly 21 is arranged on the cylindrical fixing frame, so that the air outlet of each air outlet assembly 21 is located in the radial direction of the cylindrical fixing frame and is arranged toward the heating rod 12, which helps to achieve the purpose of achieving the same distance between the hot air blown by the air outlet assembly 21 and the surface of the pole roll.

[0026] The structure of the cylindrical fixing frame mentioned above can be as described in the following embodiments. In a specific embodiment, the cylindrical fixing frame includes annular rings 31 located at both ends thereof and a plurality of air ducts 32 located on the virtual cylindrical generatrix of the cylindrical fixing frame. Every two adjacent air ducts 32 are evenly spaced, and each air duct 32 includes a first cavity for air intake and a second cavity for air return. A plurality of through holes for air outlet are provided on the outer peripheral surface of the first cavity, and the through holes are used to set the air outlet component 21 to supply air to the air outlet component 21. A fixing member 33 is provided between the annular ring 31 and the air duct 32.

[0027] Since the outer surface of the cylindrical fixing frame can be fitted into a cylindrical surface, multiple air ducts 32 can be arranged along the generatrix direction of the cylindrical surface, and the air ducts 32 can be fixed on the two annular rings 31 in sequence using fixing parts 33, thereby forming a cylindrical fixing frame, and the middle of such a cylindrical fixing frame is a through structure, which can be used to accommodate the pole coils to be baked.

[0028] Regarding the structure of the air duct 32, since the oven 11 is in a closed state when baking the pole rolls, the return air must be considered while providing hot air for the pole rolls. In one embodiment, a sleeve can be set at the center of each air duct 32, the internal cavity of the sleeve is the return air cavity, the cavity between the outside of the sleeve and the inside of the air duct 32 is the supply air cavity, the side of the supply air cavity located at the end of the air duct 32 is a blind end, the side of the air duct 32 with the blind end is provided with a return air inlet of the return air cavity, the return air outlet of the return air cavity is along the radial direction of the sleeve and passes through the air duct 32 for connecting the return air pipeline, and a plurality of through holes for air outlet are opened on the outer circumferential surface of each air duct 32, and the through holes are used to set the air outlet assembly 21 to supply air to the air outlet assembly 21, and a fixing member 33 is provided between the annular ring 31 and the air duct 32. Alternatively, the sleeve may not be provided in the center of the air duct 32. In this case, two pipes with semicircular cross sections may be spliced ​​into an air duct 32 with a circular outer surface, and the two pipes with semicircular cross sections are used for supply air and return air respectively.

[0029] The structure of the fixing member 33 used to fix the annular ring 31 and the air duct 32 mentioned above can be as described in the following embodiments. In a specific embodiment, the two ends of the fixing member 33 have a U-shaped groove and a circular opening respectively, and the bottom of the U-shaped groove has an arc-shaped depression for fitting with the outer surface of the annular ring 31 to fix the annular ring 31, and the circular opening is used to fix the air duct 32. That is, when fixing the two ends of each air duct 32 to be connected to the annular ring 31 respectively, it is necessary to use a fixing member 33 at each end of the air duct 32, that is, two fixing members 33 are required to fix one air duct 32.

[0030] Taking into account the situation that the winding thickness of the pole roll is not exactly the same, therefore, in one embodiment, the air outlet component 21 is telescopically arranged relative to the air duct 32 to adjust the distance between the air outlet of the air outlet component 21 and the outer surface of the pole roll. The purpose is to make the air outlet of the air outlet component 21 as close to the surface of the pole roll as possible, so that the hot air just blown out can quickly touch the outer surface of the pole roll within the shortest distance, so as to minimize the heat loss of the hot air blown out by the air outlet component 21.

[0031] In one embodiment, a perforated arc plate 61 is provided at the air outlet of the air outlet component 21, and barbs 62 are provided on opposite sides of the perforated arc plate 61. The barbs 62 are located in the long strip opening of the air outlet component 21, and the arc surface of the perforated arc plate 61 is arranged toward the heating rod 12.

[0032] The above is related to the baking of the outer surface of the pole roll. Regarding the baking of the outer surface of the pole roll, a convex arc plate 61 with holes is used here and its arc surface is set toward the heating rod 12 to increase the coverage of the hot air blown from the arc plate 61 with holes to the outer surface of the pole roll. It is easy to understand that if the concave side of the arc plate 61 with holes is facing the heating rod 12, the blown wind is relatively oriented in one direction to form a contraction and cannot cover the larger outer surface of the pole roll.

[0033] In the above embodiment, the air outlet assembly 21 has the shape of a trapezoidal platform, and a tubular connecting piece 71 is provided on the top of the trapezoidal platform for connecting with the through hole of the air duct 32. The perforated arc plate 61 is arranged at the bottom of the trapezoidal platform, and a steel wire rope is fixedly connected to the other side opposite to the arc surface of the perforated arc plate 61. The other end of the steel wire rope is wound around a knurled screw, and the knurled screw is screwed on the tubular connecting piece 71. It also includes a compression spring, and the two ends of the compression spring are respectively located at the top and bottom of the trapezoidal platform, so that the arc surface of the perforated arc plate 61 located at the bottom of the trapezoidal platform faces the heating rod 12, and the curvature of the arc surface of the perforated arc plate 61 can change with the tightening or relaxation of the steel wire rope.

[0034] The barb 62 mentioned above is arranged in the long strip opening of the air outlet component 21. The purpose is to assemble the perforated arc plate 61 on the main body of the air outlet component 21. When subjected to the force of the compression spring, it is more conducive to the perforated arc plate 61 not falling off from the main body of the air outlet component 21 when the arc surface of the perforated arc plate 61 faces the heating rod 12.

[0035] Since the direction of the force exerted on the perforated arc plate 61 by the steel wire rope when it is tightened is opposite to the direction of the force exerted on the perforated arc plate 61 by the compression spring, when the steel wire rope is gradually loosened and no longer tightened, the perforated arc plate 61 is subjected to more force exerted by the compression spring, causing its arc surface to be closer to the heating rod 12. In this process, the curvature of its arc surface increases, and the coverage range of the hot air blown out increases; when the steel wire rope is gradually tightened, the perforated arc plate 61 is subjected to the tension of the steel wire rope, causing its arc surface to be away from the heating rod 12. In this process, the curvature of its arc surface decreases, and the coverage range of the hot air blown out decreases. That is, by adjusting the curvature of the arc surface by the steel wire rope, the coverage range of the hot air blown out to the pole roll surface can be adjusted. Obviously, the less obvious the arc surface of the perforated arc plate 61, that is, the smoother the surface of the perforated arc plate 61, the smaller the coverage range of the hot air blown out.

[0036] When the winding volume of the pole coil is large, it is necessary to reduce the distance between the air outlet assembly 21 and the air duct 32, and even to adjust the curvature of the arc surface of the perforated arc plate 61 to be smaller to accommodate a larger pole coil. In this process, the coverage of the hot air blown out from the perforated arc plate 61 to the pole coil surface will be reduced. The present invention solves this problem by the following technical means.

[0037] In one embodiment, the heating rod 12 is fixedly connected to the oven 11, and the cylindrical fixing frame is rotatable relative to the heating rod 12. That is, the cylindrical fixing frame is rotatable relative to the heating rod 12 within a preset angle range so that the blown hot air touches the entire outer surface of the pole roll, so that the entire outer peripheral surface of the pole roll can receive heat conduction from the hot air.

[0038] Specifically, the heating rod 12 is arranged on a mounting seat, and the mounting seat is fixedly connected to the back plate of the oven 11. The mounting seat has at least three connecting parts 91 for being fixedly connected to the back plate of the oven 11, and the angles between each two adjacent connecting parts 91 are equal. The air outlet array also includes a turntable 92, and the turntable 92 is arranged on a side of the cylindrical fixing frame close to the back plate of the oven 11 and is fixedly connected to the cylindrical fixing frame. Here, the turntable 92 can be fixedly connected to the annular ring 31. The turntable 92 is provided with arc-shaped avoidance grooves 920 of the same number as the connecting parts 91, and each connecting part 91 passes through the arc-shaped avoidance groove 920 and is fixedly connected to the back plate of the oven 11. It also includes a driving motor and a driving shaft 93 for driving the turntable 92 to rotate, the driving shaft 93 passes through the back plate of the oven 11 and is fixedly connected to the center of the turntable 92, a magnetic fluid sealing device is provided at the connection between the driving shaft 93 and the back plate of the oven 11, the turntable 92 rotates within a preset angle range to allow each connecting portion 91 to reciprocate in the corresponding arc-shaped avoidance groove 920; a plurality of direct connectors are provided on the back plate, and both ends of the direct connectors are used to connect to a hose 94, the air supply cavity and the return air cavity of the air duct 32 are connected to the direct connectors by using the hose 94, and the direct connectors are connected to the air supply pipeline and the air return pipeline by using the hose 94.

[0039] That is, when the hot air blown out by the perforated arc plate 61 cannot completely cover the outer surface of the pole roll, the purpose of making the hot air blown out by the perforated arc plate 61 completely cover the outer surface of the pole roll is achieved by rotating the cylindrical fixing frame relative to the heating rod 12 within a preset angle range.

[0040] Since the cylindrical fixing frame needs to rotate, it is not suitable to set hard pipes for the air supply duct and the air return duct. At this time, a direct joint needs to be set on the back plate of the oven 11, and hoses 94 are respectively set at both ends of the direct joint for conveying gas.

[0041] In some other embodiments, the heating rod 12 includes a solid body and a heat sink located on the outer surface of the solid body, and the outer surface of the heat sink is used to cover the core support of the pole coil. Since the outer surface of the solid body has a heat sink structure, the heat dissipation area can be increased, so that the core of the pole coil can be better heated.

[0042] It should be understood that the possible terms "first" or "second" etc. in the claims, specifications and drawings disclosed in the present invention are used to distinguish different objects rather than to describe a specific order. The terms "include" and "comprise" used in the specifications and claims disclosed in the present invention indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0043] It should also be understood that the terms used in this disclosure are only for the purpose of describing specific embodiments and are not intended to limit the disclosure. As used in the disclosure and claims, the singular forms of "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be further understood that the term "and / or" used in the disclosure and claims refers to any combination of one or more of the associated listed items and all possible combinations, including these combinations.

[0044] Although the embodiments of the present invention are as described above, the contents are only examples used to facilitate understanding of the present invention, and are not intended to limit the scope and application scenarios of the present invention. Any technician in the technical field of the present invention can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention, but the scope of patent protection of the present invention shall still be based on the scope defined by the attached claims.

Claims

1. A pole coil baking device, characterized in that: include: An oven (11) and an air outlet array located in the oven (11), wherein the cross section of the air outlet array along the direction of entry and exit of the pole coil is annular in shape, and the air outlet array extends inwardly from the opening and closing door of the oven (11) to the back of the oven (11) along the direction of entry and exit of the pole coil without contacting the back of the oven (11), so as to separate the interior of the oven (11) into a baking area located within the annular shape and a non-baking area located outside the annular shape, wherein a heating rod (12) is provided at the center of the baking area along the direction of entry and exit of the pole coil, and the air outlet array is used to provide hot air to blow the outer surface of the pole coil, and the heating rod (12) is used to suspend the pole coil and provide a contact heat source for the core of the pole coil.

2. The pole coil baking device according to claim 1, characterized in that: The air outlet array comprises a cylindrical fixing frame with two through ends, the heating rod (12) being located in the cylindrical interior of the cylindrical fixing frame, a plurality of air outlet components (21) being provided on the cylindrical fixing frame, the air outlet of each air outlet component (21) being located in the radial direction of the cylindrical fixing frame and arranged towards the heating rod (12).

3. The pole coil baking device according to claim 2, characterized in that: The cylindrical fixing frame comprises an annular ring (31) located at both ends thereof and a plurality of air ducts (32) located on the virtual cylindrical generatrix of the cylindrical fixing frame, wherein each two adjacent air ducts (32) are evenly spaced, and each air duct (32) comprises a first cavity for air intake and a second cavity for air return, wherein a plurality of through holes for air outlet are provided on the outer peripheral surface of the first cavity, wherein an air outlet component (21) is provided at the through holes to supply air to the air outlet component (21), and a fixing member (33) is provided between the annular ring (31) and the air duct (32).

4. The pole coil baking device according to claim 3, characterized in that: The two ends of the fixing member (33) respectively have a U-shaped groove and a circular opening, the bottom of the U-shaped groove has an arc-shaped recess for fitting with the outer surface of the annular ring (31) to fix the annular ring (31), and the circular opening is used to fix the air duct (32).

5. The pole coil baking device according to claim 3, characterized in that: The air outlet component (21) is telescopically arranged relative to the air duct (32) so as to adjust the distance between the air outlet of the air outlet component (21) and the outer surface of the pole roll.

6. The pole coil baking device according to claim 2, characterized in that: An arc-shaped plate (61) with a hole is provided at the air outlet of the air outlet component (21), and barbs (62) are provided on opposite sides of the arc-shaped plate (61) with a hole. The barbs (62) are located in the long strip opening of the air outlet component (21), and the arc surface of the arc-shaped plate (61) with a hole is arranged toward the heating rod (12).

7. The pole coil baking device according to claim 6, characterized in that: The air outlet assembly (21) has a shape of a trapezoidal platform. A tubular connector (71) is provided at the top of the trapezoidal platform for connecting to the through hole of the air duct (32). The perforated arc plate (61) is arranged at the bottom of the trapezoidal platform. A steel wire rope is fixedly connected to the other side opposite to the arc surface of the perforated arc plate (61). The other end of the steel wire rope is wound around a knurled screw. The knurled screw is screwed onto the tubular connector (71). A compression spring is also included. The two ends of the compression spring are respectively located at the top and bottom of the trapezoidal platform so that the arc surface of the perforated arc plate (61) located at the bottom of the trapezoidal platform faces the heating rod (12). The degree of curvature of the arc surface of the perforated arc plate (61) can change with the tightening or loosening of the steel wire rope.

8. The pole coil baking device according to claim 2, characterized in that: The heating rod (12) is fixedly connected to the oven (11), and the cylindrical fixing frame is rotatably arranged relative to the heating rod (12).

9. The pole coil baking device according to claim 8, characterized in that: The heating rod (12) is arranged on a mounting seat, and the mounting seat is fixedly connected to the back plate of the oven (11). The mounting seat has at least three connecting parts (91) for being fixedly connected to the back plate of the oven (11), and the angles between each two adjacent connecting parts (91) are equal. The air outlet array also includes a rotating disk (92), and the rotating disk (92) is arranged on a side of the cylindrical fixing frame close to the back plate of the oven (11) and is fixedly connected to the cylindrical fixing frame. The rotating disk (92) is provided with a number of arc-shaped avoidance grooves (920) equal to the number of the connecting parts (91), and each connecting part (91) passes through the arc-shaped avoidance groove (920) and is fixedly connected to the back plate of the oven (11). The rotating disk (92) also includes a rotating device for driving the rotating disk (92). A rotating drive motor and a drive shaft (93) are provided on the back plate of the oven (11), the drive shaft (93) passing through the back plate of the oven (11) and being fixedly connected to the center of the turntable (92); a magnetic fluid sealing device is provided at the connection between the drive shaft (93) and the back plate of the oven (11); the turntable (92) rotates within a preset angle range so that each connection part (91) reciprocates in the corresponding arc-shaped avoidance groove (920); a plurality of direct joints are provided on the back plate, and both ends of the direct joints are used to connect with a hose (94); the air supply cavity and the return cavity of the air duct (32) are connected to the direct joints by using the hose (94); and the direct joints are connected to the air supply pipeline and the air return pipeline by using the hose (94).

10. The pole coil baking device according to claim 1, characterized in that: The heating rod (12) comprises a solid body and a heat sink located on the outer surface of the solid body, wherein the outer surface of the heat sink is used for sleeve-mounting a core support of a pole coil.

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