Heating device

Abstract

The utility model relates to the technical field of electromagnetic induction heating, and discloses a heating device which is suitable for heating a workpiece provided with a channel and provided with a protruding part on the outer wall, the heating device comprises an induction coil and a magnetic conductive part, and the induction coil is suitable for extending into the channel in the axial direction of the channel to generate a magnetic field to heat the inner wall of the channel. The magnetic conductive member is arranged on the periphery of the induction coil and is suitable for increasing the magnetic flux of the magnetic conductive member in the magnetic field. According to the asymmetric shell heating device, the asymmetric shell can be uniformly heated during heating, and consistent deformation quantity is ensured.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electromagnetic induction heating, and particularly relates to a heating device. BACKGROUND

[0002] The oil-cooled electric drive system is one of the core components in the field of modern new energy vehicles and industrial drives, and its performance directly affects the efficiency, reliability and service life of the motor. In the electric drive assembly process, the assembly of the stator and the shell is one of the key processes. Since the stator and the shell are usually fitted with an interference fit to ensure good heat conduction and mechanical stability, the shrinkage process is widely used in stator assembly. The shrinkage process utilizes the principle of thermal expansion and contraction, expands the shell by heating, then presses the stator core, and forms a tight interference fit after cooling.

[0003] At present, induction heating technology is usually used in the shrinkage process to heat the inner wall of the oil-cooled motor integrated shell. The induction heating coil is made of copper pipe, and eddy current is induced in the inner wall of the shell by high-frequency or medium-frequency alternating current, thereby achieving heating.

[0004] However, the product structure of the oil-cooled motor integrated shell is usually an asymmetric cylindrical structure, which causes uneven magnetic field distribution during induction heating, resulting in uneven heating of the shell, and further causing inconsistent deformation due to large local temperature difference. Due to uneven heating of the shell, the expansion of some areas is insufficient, while the expansion of other areas is excessive, causing uneven stress on the shell when pressing the stator core, which easily causes scratches or even cracks, seriously affecting product quality. CONTENT OF THE INVENTION

[0005] The application provides a heating device to solve the problem of inconsistent deformation caused by uneven heating of an asymmetric shell.

[0006] In a first aspect, the application provides a heating device suitable for heating a workpiece having a channel and an outer wall provided with a protruding portion, the heating device comprising an induction coil and a magnetic conducting member. The induction coil is adapted to extend into the channel along the axial direction of the channel to generate a magnetic field to heat the inner wall of the channel. The magnetic conducting member is arranged at the periphery of the induction coil and is adapted to increase the magnetic flux at the position of the magnetic conducting member in the magnetic field, and the magnetic conducting member corresponds to the position of the protruding portion.

[0007] Beneficial effects: The arrangement of the magnetic conducting member can concentrate the magnetic field generated by the induction coil, significantly enhancing the magnetic flux in the corresponding area of the protruding portion on the inner wall of the channel. This design can compensate for the uneven magnetic field distribution of the asymmetric shell structure, reduce the local temperature difference, improve the consistency of the deformation, thereby avoiding scratches or cracks caused by uneven expansion during pressing, and improving the assembly success rate.

[0008] In an alternative embodiment, the magnetic conductive member and the protruding portion are distributed along the radial direction of the channel, and the magnetic conductive member faces the protruding portion along the radial direction of the channel.

[0009] Beneficial effects: By distributing the magnetic conductive member and the protruding portion along the radial direction of the channel, and by facing the magnetic conductive member to the protruding portion along the radial direction of the channel, the magnetic conductive member can concentrate the magnetic field generated by the induction coil, significantly enhancing the magnetic flux in the corresponding area of the protruding portion on the inner wall of the channel.

[0010] In an alternative embodiment, the magnetic conductive member is provided in a sheet structure, the magnetic conductive member has a first surface and a second surface arranged oppositely, the first surface is connected to the peripheral side wall of the induction coil, and in the state where the induction coil extends into the channel along the axial direction of the channel, the second surface faces the protruding portion along the radial direction of the channel.

[0011] Beneficial effects: The first surface of the sheet-shaped magnetic conductive member is attached to the side wall of the induction coil, and the second surface faces the protruding portion, which can more accurately guide the magnetic field to concentrate on the protruding portion. The sheet structure is easy to install and adapts to the shape of the coil, improving the efficiency of magnetic circuit optimization, ensuring the uniformity of heating in the area corresponding to the protruding portion on the inner wall of the channel and other areas of the inner wall of the channel, further reducing the temperature difference and the difference in deformation.

[0012] In an alternative embodiment, the induction coil is designed in a cylindrical spiral structure extending along the axial direction of the channel, and in the state where the induction coil extends into the channel along the axial direction of the channel, the induction coil coincides with the axis of the channel, a gap is left between the peripheral side wall of the induction coil and the inner wall of the channel, and a gap is left between the magnetic conductive member and the inner wall of the channel.

[0013] Beneficial effects: The induction coil is designed in a cylindrical spiral structure and coincides with the axis of the channel, which can ensure the uniform distribution of the magnetic field along the inner wall of the channel; gaps are left between the induction coil and the inner wall of the channel, and between the magnetic conductive member and the inner wall of the channel, avoiding mechanical interference or local heat accumulation caused by direct contact. This structure is suitable for asymmetric shells, reduces magnetic field distortion caused by complex structure, and improves overall heating uniformity.

[0014] In an alternative embodiment, the outer wall of the workpiece is provided with a plurality of protruding portions, and the induction coil is provided with a plurality of magnetic conductive members corresponding one-to-one to the plurality of protruding portions.

[0015] Beneficial effects: The plurality of magnetic conductive members correspond one-to-one to the plurality of protruding portions, which can compensate for the directional magnetic field for the protruding portions at different positions on the asymmetric shell. By enhancing the magnetic field in different areas, the problem of uneven heating caused by the multi-protruding structure is effectively solved, the global deformation is consistent, and local stress concentration is avoided.

[0016] In an alternative embodiment, a power conversion component is further included, connected to the induction coil, and adapted to convert the input AC power into high-frequency AC power or medium-frequency AC power, so that the induction coil generates an alternating magnetic field under the action of the high-frequency AC power or medium-frequency AC power. The power conversion component is arranged at one end of the induction coil along the axial direction thereof.

[0017] Beneficial effects: The power conversion component converts the power frequency AC power into high-frequency or medium-frequency AC power, which is suitable for the heating requirements of shells with different thicknesses or materials. The power conversion component is integrated at one end of the induction coil along the axial direction, which enables the induction coil to enter the channel, reduces energy transmission loss, and improves heating efficiency.

[0018] In an alternative embodiment, a rack, a driving assembly, and a connecting component are further included. The driving assembly is arranged on the rack. The connecting component is connected to the power conversion component. The driving end of the driving assembly is connected to the connecting component. The driving assembly is adapted to drive the induction coil to move along the axial direction of the channel.

[0019] Beneficial effects: The driving assembly controls the movement of the induction coil along the axial direction of the channel through the connecting component, which can dynamically adjust the heating position according to the length or shape of the workpiece, and realize adaptive heating. This design is particularly suitable for asymmetric or special-shaped shells, avoids the heating blind area caused by fixed coils, and improves process flexibility. At the same time, it is also convenient for loading and disassembling the workpiece, avoids the influence of the fixed position of the induction coil on the disassembly of the workpiece, and improves convenience.

[0020] In an alternative embodiment, the driving assembly includes a moving slide and a driving component. The moving slide is connected to the rack and includes a sliding block connected to the connecting component and sliding along the axial direction of the moving slide. The driving component is arranged on the rack, and the output end thereof is connected to the input end of the moving slide.

[0021] Beneficial effects: The moving slide cooperates with the driving component to realize the precise linear displacement of the induction coil, and ensures the stability of the relative position between the coil and the inner wall of the shell during the heating process. The slide structure has high mechanical precision, and the moving path can be programmed and controlled, which further guarantees the heating uniformity and process repeatability.

[0022] In an alternative embodiment, a control assembly is further included, which is adapted to acquire the temperature information of the workpiece and set the heating time of the induction coil.

[0023] Beneficial effects: The control assembly realizes closed-loop control by monitoring the temperature in real time and setting the heating time. By dynamically adjusting the power or moving speed in combination with temperature feedback, it avoids overheating or underheating, ensures the stability and controllability of the heating process, and significantly reduces the scrap rate.

[0024] In an alternative embodiment, the magnetic conducting member is provided as a manganese-zinc ferrite sheet.

[0025] Beneficial effects: The manganese-zinc ferrite sheet has the characteristics of high magnetic permeability and low eddy current loss, can efficiently concentrate the magnetic field and reduce energy waste. Its high-temperature resistance performance is suitable for induction heating environment, has high long-term use stability, and further improves the heating efficiency and device reliability. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed in the description of the specific embodiments or prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Fig. 1 FIG. 1 is a structural schematic diagram of a heating device according to an embodiment of the present application;

[0028] Fig. 2 FIG. 2 is a structural schematic diagram of a workpiece according to an embodiment of the present application;

[0029] Fig. 3 FIG. 3 is a structural schematic diagram of a stator according to an embodiment of the present application.

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 1, induction coil; 2, magnetic conducting member; 3, power conversion member; 4, rack; 5, driving assembly; 5001, moving slide; 5002, driving member; 6, connecting member; 7, rib plate; 8, workpiece; 8001, protruding part; 8002, channel; 9, stator. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0033] The embodiments of the present application will be described below in combination with Figs. 1 to 3 .

[0034] According to the embodiments of the present application, a heating device is provided, which is suitable for heating a workpiece 8 having a channel 8002 and an outer wall provided with a protruding portion 8001. The heating device comprises an induction coil 1 and a magnetic conducting member 2. The induction coil 1 is adapted to extend into the channel 8002 along the axial direction of the channel 8002 to generate a magnetic field to heat the inner wall of the channel 8002. The magnetic conducting member 2 is arranged on the periphery of the induction coil 1 and is adapted to increase the magnetic flux at the position of the magnetic conducting member 2 in the magnetic field, and the magnetic conducting member 2 corresponds to the position of the protruding portion 8001.

[0035] Specifically, in the state that the induction coil 1 extends into the channel 8002 along the axial direction of the channel 8002, the magnetic conducting member 2 is distributed along the radial direction of the channel 8002 and faces the protruding portion 8001 along the radial direction of the channel 8002. The magnetic conducting member 2 locally enhances the heating of the protruding portion 8001 to ensure the uniformity of the heating, and finally realizes that the overall heating temperature difference of the cold motor integrated shell is less than 20 degrees, and the thermal expansion deformation deviation is less than 0.2 millimeters, which avoids scratching the inner wall of the channel 8002 of the cold motor integrated shell during the thermal fitting process, and improves the consistency and stability of the motor product quality. As shown in Fig. 2 and Fig. 3 As shown, the workpiece 8 can be an oil-cooled motor integrated shell with an asymmetric cylindrical structure. By using the principle of thermal expansion and contraction, the oil-cooled motor integrated shell is heated and expanded by the induction coil 1 and the magnetic conducting member 2, and then the stator 9 is press-fitted, and after cooling, a tight interference fit can be formed.

[0036] It can be understood that due to the limited space inside the induction coil 1, the shape and size of the magnetic conducting member 2 are constrained, and the adaptability is poor. Therefore, the magnetic conducting member 2 in the heating device is attached to the peripheral side wall of the induction coil 1, and the magnetic conducting member 2 can be flexibly designed as a sheet, a block or a special-shaped structure, and precisely matched with the protruding portion 8001 of the outer wall of the workpiece 8. The layout of the magnetic conducting member 2 can be quickly adjusted for different shapes of the workpiece 8 to realize customized magnetic field enhancement.

[0037] It should be noted that the magnetic conducting member 2 in the heating device is located on the peripheral side wall of the induction coil 1, which can actively diffuse the magnetic induction lines outward and concentrate them to the specific area of the shell that needs to be heated, such as the protruding portion 8001. By directly enhancing the magnetic field strength of the surface of the workpiece 8 shell, the uneven distribution of the magnetic field caused by the asymmetric structure is compensated. At the same time, the magnetic induction lines can directly penetrate to the surface of the workpiece 8 through the magnetic conducting member 2, which greatly shortens the magnetic field path, reduces the magnetic resistance in the magnetic circuit, reduces energy loss, and improves heating efficiency. Compared with locating the magnetic conducting member 2 inside the induction coil 1, the magnetic induction lines inside the induction coil 1 will preferentially concentrate to the inside of the coil, which may weaken the magnetic field coverage of the external workpiece 8, resulting in reduced heating efficiency. Moreover, if the magnetic conducting member 2 is located inside the coil, the magnetic induction lines need to pass through the internal magnetic conducting member 2 of the coil before diffusing to the workpiece 8, which has a longer path and greater energy loss.

[0038] In the embodiment, the magnetic conductive member 2 is arranged in a sheet structure, and the magnetic conductive member 2 has a first surface and a second surface arranged oppositely, the first surface is connected with the peripheral side wall of the induction coil 1, and the second surface is directed to the protruding part 8001 along the radial direction of the channel 8002 in the state that the induction coil 1 extends into the channel 8002 along the axial direction of the channel 8002.

[0039] In one embodiment, the magnetic conductive member 2 is arranged in a sheet structure, and the magnetic conductive member 2 has a first surface and a second surface arranged oppositely, the first surface is connected with the peripheral side wall of the induction coil 1, and the second surface is directed to the protruding part 8001 along the radial direction of the channel 8002 in the state that the induction coil 1 extends into the channel 8002 along the axial direction of the channel 8002.

[0040] It can be understood that, by arranging the magnetic conductive member 2 in a sheet structure and connecting one surface of the sheet structure with the peripheral side wall of the induction coil 1, the whole assembly process can be more efficient and convenient. Meanwhile, the magnetic conductive member 2 can be arranged in a curved sheet structure, so that the magnetic conductive member 2 can be more closely attached to the periphery of the induction coil 1. Meanwhile, the sheet structure of the magnetic conductive member 2 can be stacked according to the increase of the protruding thickness of the protruding part 8001 of the workpiece 8, so that the adaptability can be improved.

[0041] Optionally, the magnetic conductive member 2 can be designed flexibly in a sheet structure, a block structure or a special-shaped structure, and precisely matched with the protruding part 8001 of the outer wall of the workpiece 8. The layout of the magnetic conductive member 2 can be quickly adjusted for different shapes of the workpiece 8, so that customized magnetic field enhancement can be realized.

[0042] In the embodiment, the first surface of the sheet-shaped magnetic conductive member 2 is attached to the side wall of the induction coil 1, and the second surface is directed to the protruding part 8001, so that the magnetic field can be more accurately guided to the protruding part 8001. The sheet structure is easy to install and adapt to the shape of the coil, so that the efficiency of magnetic circuit optimization can be improved, the uniformity of heating of the area corresponding to the protruding part 8001 on the inner wall of the channel 8002 and other areas on the inner wall of the channel 8002 can be ensured, and the temperature difference and deformation difference can be further reduced.

[0043] In one embodiment, the induction coil 1 is spirally extended along the axial direction of the channel 8002 to form a cylindrical structure, the induction coil 1 coincides with the axis of the channel 8002 in the state that the induction coil 1 extends into the channel 8002 along the axial direction of the channel 8002, a gap is left between the peripheral side wall of the induction coil 1 and the inner wall of the channel 8002, and a gap is left between the magnetic conductive member 2 and the inner wall of the channel 8002.

[0044] Optionally, the cross-sectional shape of the induction coil 1 can be set to a shape that matches the cross-sectional shape of the channel 8002, improving the adaptability of the induction coil 1 to the channel 8002 and further ensuring the uniformity of the induction coil 1 when heating the workpiece 8.

[0045] In this embodiment, the induction coil 1 is designed in a cylindrical spiral structure and coincides with the axis of the channel 8002, which can ensure that the magnetic field is uniformly distributed along the inner wall of the channel 8002; gaps are left between the induction coil 1 and the inner wall of the channel 8002, and between the magnetic conductive member 2 and the inner wall of the channel 8002, to avoid mechanical interference or local heat accumulation caused by direct contact. This structure is suitable for asymmetric shells, reduces magnetic field distortion caused by complex structure, and improves overall heating uniformity.

[0046] In one embodiment, the outer wall of the workpiece 8 is provided with a plurality of protrusions 8001, and the induction coil 1 is provided with a plurality of magnetic conductive members 2 corresponding to the plurality of protrusions 8001.

[0047] Optionally, the number of conductive members in the corresponding area can be adjusted according to the volume of different protrusions 8001.

[0048] In this embodiment, the plurality of magnetic conductive members 2 correspond to the plurality of protrusions 8001, which can compensate for the directional magnetic field for protrusions 8001 at different positions on the asymmetric shell. Through regional magnetic field enhancement, the problem of uneven heating caused by multi-protrusion structure is effectively solved, the global deformation is consistent, and local stress concentration is avoided.

[0049] In one embodiment, it further includes a power conversion member 3 connected to the induction coil 1, which is adapted to convert the input alternating current into high-frequency alternating current or medium-frequency alternating current, so that the induction coil 1 generates an alternating magnetic field under the action of high-frequency current or medium-frequency alternating current. The power conversion member 3 is arranged at one end of the induction coil 1 along its axial direction.

[0050] Optionally, the power conversion member 3 can be set as a heating head, which is a conventional component in electromagnetic induction heating technology and can convert alternating current into high-frequency or medium-frequency alternating current required by the device, mainly through power conversion circuit and induction heating technology. The output high-frequency or medium-frequency alternating current can be directly supplied to the induction coil 1, and the induction coil 1 generates an alternating magnetic field under the action of high-frequency current.

[0051] In this embodiment, the power conversion member 3 converts power frequency alternating current into high-frequency or medium-frequency alternating current, which meets the heating needs of shells with different thicknesses or materials. The power conversion member 3 is integrated at one end of the induction coil 1 along its axial direction, which can make the induction coil 1 enter the channel 8002, reduce energy transmission loss, and improve heating efficiency.

[0052] In an embodiment, the rack 4, the driving assembly 5 and the connecting piece 6 are further included. The driving assembly 5 is arranged on the rack 4. The connecting piece 6 is connected with the power conversion piece 3, and the driving end of the driving assembly 5 is connected with the connecting piece 6. The driving assembly 5 is adapted to drive the inductive coil 1 to move along the axial direction of the channel 8002.

[0053] In the embodiment, the driving assembly 5 controls the inductive coil 1 to move along the axial direction of the channel 8002 through the connecting piece 6. The heating position can be dynamically adjusted according to the length or shape of the workpiece 8, and adaptive heating is realized. This design is particularly suitable for asymmetric or special-shaped shells, avoids the heating blind area caused by fixed coils, and improves the process flexibility. At the same time, it is also convenient for loading and disassembling the workpiece 8, avoids the influence of the fixed position of the inductive coil 1 on the disassembly of the workpiece 8, and improves the convenience.

[0054] In an embodiment, the driving assembly 5 includes a moving slide 5001 and a driving piece 5002. The moving slide 5001 is connected with the rack 4 and includes a sliding block connected with the connecting piece 6 and sliding along the axial direction of the moving slide 5001. The driving piece 5002 is arranged on the rack 4, and the output end thereof is connected with the input end of the moving slide 5001.

[0055] Optionally, the driving piece 5002 can be a servo motor. Through the assembly of the servo motor and the moving slide 5001, the high-precision motion control capability of the servo control system can be realized through the cooperative work of the motor, the sensor and the controller, and the accurate positioning and movement of the moving slide 5001 can be realized.

[0056] In the embodiment, the moving slide 5001 cooperates with the driving piece 5002 to realize the accurate linear displacement of the inductive coil 1 and ensure the stability of the relative position between the coil and the inner wall of the shell during the heating process. The slide structure has high mechanical precision and can program the moving path, further ensuring the heating uniformity and process repeatability.

[0057] In an embodiment, the rib plate 7 is further included, which includes intersecting first and second sides. The first side is connected with the outer side wall of the connecting piece 6, and the second side is connected with the power conversion piece 3.

[0058] Optionally, the rib plate 7, the connecting piece 6, the rib plate 7, the power conversion piece 3, the power conversion piece 3, the connecting piece 6, the connecting piece 6 and the sliding block can all be welded.

[0059] In the embodiment, the rib plate 7 is connected with the connecting piece 6 through the first side and with the power conversion piece 3 through the second side, which enhances the rigidity of the overall structure and prevents the magnetic field from deviating due to vibration when the coil moves. At the same time, the rib plate 7 shares mechanical stress and prolongs the service life of the equipment.

[0060] In one embodiment, a control assembly is further included, which is adapted to acquire temperature information of the workpiece 8 and set the heating time of the induction coil 1.

[0061] It should be noted that the control assembly includes a power management module, a temperature monitoring module, a control module, and a time control module. Among them, the power management module is adapted to manage the power adjustment of the power supply. It includes a power regulator that can adjust the output power to adapt to different heating needs. The temperature monitoring module is adapted to monitor the temperature of the heated object in real time. It includes a temperature sensor and a signal conditioning circuit. The temperature sensor can be set as a thermocouple, an infrared thermometer, or a thermistor, which is used to collect temperature data. The signal conditioning circuit is used to convert the sensor signal into an electrical signal that can be processed by the control system. The control module controls the heating process according to the preset parameters and real-time data. It includes a microcontroller or a programmable logic controller, which can serve as the control core to perform logical operations and control algorithms. It also includes a memory that stores preset parameters (such as target temperature, heating time, etc.) and running data. The time control module can accurately control the heating time to ensure the repeatability of the heating process. It includes a timer that can be integrated into the microcontroller or programmable logic controller for timing and controlling the heating duration.

[0062] Optionally, the connecting piece 6 is provided with an inner cavity, and each electrical element in the control assembly can be integrated in the inner cavity of the connecting piece 6.

[0063] In this embodiment, the control assembly realizes closed-loop control by monitoring the temperature in real time and setting the heating time. Combined with temperature feedback, it dynamically adjusts the power or moving speed to avoid overheating or underheating, ensuring a stable and controllable heating process and significantly reducing the scrap rate.

[0064] In one embodiment, the magnetic guide 2 can be made of manganese-zinc ferrite sheet.

[0065] It should be noted that the magnetic guide 2 is made of high magnetic permeability material (such as ferrite, silicon steel sheet, etc.), which can effectively guide and concentrate the magnetic induction lines. In induction heating, the main function of the magnetic guide 2 is to optimize the magnetic circuit and reduce the loss of magnetic induction lines, making the magnetic field more concentrated. Without the magnetic guide 2, the magnetic induction lines generated by the induction coil 1 will spread to the surrounding space, resulting in a decrease in magnetic field strength. After adding the magnetic guide 2, the magnetic induction lines will be guided by the magnetic guide 2 and tightly surround the magnetic guide 2, forming a closed magnetic circuit. The high magnetic permeability of the magnetic guide 2 reduces the magnetic resistance of the magnetic circuit, making it easier for the magnetic induction lines to pass through the magnetic guide 2, thereby enhancing the magnetic field strength inside the coil.

[0066] In this embodiment, the manganese-zinc ferrite sheet has the characteristics of high magnetic permeability and low eddy current loss, which can efficiently concentrate the magnetic field and reduce energy waste. Its high-temperature resistance performance adapts to the induction heating environment, with high long-term stability, further improving the heating efficiency and device reliability.

[0067] While embodiments of the application have been described in connection with the preferred embodiments of the various figures, those of ordinary skill in the art will appreciate that various modifications and variations of the preferred embodiments can be employed without departing from the spirit and scope of the application.

Claims

1. A heating device, characterized in that, The application relates to a heating device suitable for heating a workpiece (8) with a channel (8002) and a protrusion (8001) on the outer wall of the workpiece (8), which comprises: an induction coil (1) suitable for extending into the channel (8002) along the axial direction of the channel (8002) to generate a magnetic field to heat the inner wall of the channel (8002); a magnetic conducting member (2) arranged on the periphery of the induction coil (1) and suitable for increasing the magnetic flux at the position of the magnetic conducting member (2) in the magnetic field, and the magnetic conducting member (2) corresponds to the position of the protrusion (8001).

2. The heating device of claim 1, wherein In the state that the induction coil (1) extends into the channel (8002) along the axial direction of the channel (8002), the magnetic conducting member (2) is distributed along the radial direction of the channel (8002) and faces the protrusion (8001) along the radial direction of the channel (8002).

3. The heating device of claim 2, wherein, The magnetic conducting member (2) is arranged in a sheet structure, the magnetic conducting member (2) has oppositely arranged first and second surfaces, the first surface is connected with the peripheral side wall of the induction coil (1), and in the state that the induction coil (1) extends into the channel (8002) along the axial direction of the channel (8002), the second surface faces the protrusion (8001) along the radial direction of the channel (8002).

4. The heating device of claim 2, wherein, The induction coil (1) is arranged in a cylindrical structure in the state that the induction coil (1) extends into the channel (8002) along the axial direction of the channel (8002), the induction coil (1) coincides with the axis of the channel (8002), a gap is left between the peripheral side wall of the induction coil (1) and the inner wall of the channel (8002), and a gap is left between the magnetic conducting member (2) and the inner wall of the channel (8002).

5. The heating device of claim 1, wherein, A plurality of protrusions (8001) are arranged on the outer wall of the workpiece (8), and a plurality of magnetic conducting members (2) corresponding to the plurality of protrusions (8001) are arranged on the induction coil (1).

6. The heating device of claim 1, wherein, Further comprising: a power conversion member (3) connected with the induction coil (1), the power conversion member (3) is suitable for converting input alternating current into high-frequency alternating current or medium-frequency alternating current, so that the induction coil (1) generates an alternating magnetic field under the action of high-frequency alternating current or medium-frequency alternating current, and the power conversion member (3) is arranged at one end of the induction coil (1) along the axial direction.

7. The heating device of claim 6, wherein, Further comprising: a rack (4); a driving assembly (5) arranged on the rack (4); a connecting member (6) connected with the power conversion member (3), a driving end of the driving assembly (5) is connected with the connecting member (6), and the driving assembly (5) is suitable for driving the induction coil (1) to move along the axial direction of the channel (8002).

8. The heating device of claim 7, wherein, The driving assembly (5) comprises: a moving slide table (5001) connected with the rack (4) and comprising a sliding block, the sliding block is connected with the connecting member (6), and the sliding block slides along the axial direction of the moving slide table (5001). A driving member (5002) is arranged on the frame (4), and an output end of the driving member (5002) is connected with an input end of the moving slide (5001).

9. The heating device of claim 1, wherein, Further comprising: A control assembly is adapted to acquire temperature information of the workpiece (8), and set a heating time of the induction coil (1).

10. The heating device of claim 1, wherein, The magnetically conductive member (2) is arranged as a manganese-zinc ferrite sheet.

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