Bottle-shaped metal workpiece closing-in heating device and heating method

Abstract

The invention discloses a bottle-shaped metal workpiece closing-in heating device and a heating method.The bottle-shaped metal workpiece closing-in heating device comprises a mounting frame, a heating assembly and a position adjusting assembly, the heating assembly and the position adjusting assembly are both mounted on the mounting frame, the heating assembly comprises a furnace lining, an inner-layer coil and an outer-layer coil, the furnace lining extends in the vertical direction and is arranged on the mounting frame, and the inner-layer coil and the outer-layer coil are arranged on the mounting frame; the furnace lining is provided with a heating channel with an upward opening, the heating channel is used for containing a bottle-shaped metal workpiece, the inner layer coil is arranged on the furnace lining in a sleeving mode, the outer layer coil is installed on the position adjusting assembly and movably arranged on the inner layer coil in a sleeving mode through the position adjusting assembly, and an input connecting bar of the inner layer coil is used for being electrically connected with an L1 wire end of a power cabinet. The output connecting bar of the inner layer coil is electrically connected with the input connecting bar of the outer layer coil, and the output connecting bar of the outer layer coil is used for being electrically connected with the L2 wire end of the power supply cabinet. A double-coil magnetic field is formed by the inner-layer coil and the outer-layer coil, and the height of the outer-layer coil is adjusted through the position adjusting assembly, so that the heating temperature gradient is dynamically adjusted and controlled.

Description

Technical Field

[0001] This invention relates to the field of bottle-shaped metal workpiece manufacturing technology, specifically to a bottle-shaped metal workpiece necking heating device and heating method. Background Technology

[0002] In the field of metal processing, bottle-shaped metal workpieces (such as high-pressure gas cylinders, metal packaging containers, fire extinguisher canisters, etc.) often require necking, constriction, or edge rolling at their open ends to achieve functions such as sealing, installing end caps, or fuses. This necking process typically requires localized heating of the workpiece's opening area to reach the material's plastic deformation temperature, thereby achieving precise forming under mechanical pressure. Because different specifications of bottle-shaped metal workpieces vary significantly in terms of diameter, height, wall thickness, and material properties, they have specific and diverse process requirements for the axial temperature distribution (i.e., temperature gradient) of the heating area—for example, some workpieces require high-temperature softening at the opening while maintaining a lower temperature at the root to preserve structural strength, while others require a wider transition temperature zone to avoid thermal stress cracking.

[0003] Currently, induction heating is widely used in industry for preheating before sealing. Traditional sealing heating devices mostly use single-layer fixed induction coils, whose temperature gradient characteristics mainly depend on the coil winding pitch design: by setting coil turns with varying density at different axial positions, a non-uniform magnetic field is formed, thereby obtaining the desired temperature distribution. However, this approach has significant limitations: on the one hand, once the coil turn pitch is determined during the manufacturing stage, the resulting temperature gradient is fixed and cannot be dynamically adjusted according to workpiece specifications; on the other hand, to adapt to bottle-shaped metal workpieces of different sizes or types, multiple sets of dedicated inductors are often required, which not only significantly increases equipment costs and warehouse management complexity but also leads to long production line changeover times and low efficiency. In addition, when debugging new workpiece processes, it is often necessary to repeatedly trial-produce coils and conduct multiple heating tests, resulting in long development cycles and serious resource waste. Summary of the Invention

[0004] The purpose of this invention is to provide a heating device and method for closing the neck of a bottle-shaped metal workpiece, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this disclosure provides a bottle-shaped metal workpiece necking heating device, including a mounting frame, a heating assembly, and a position adjustment assembly; Both the heating component and the position adjustment component are mounted on the mounting bracket; The heating assembly includes a furnace lining, an inner coil, and an outer coil. The furnace lining extends in a vertical direction and is mounted on the mounting frame. The furnace lining has an upward-opening heating channel for accommodating bottle-shaped metal workpieces. The inner coil is sleeved on the furnace lining, and the outer coil is installed on the position adjustment assembly and movably sleeved on the inner coil through the position adjustment assembly. The input connection bar of the inner coil is used to conduct electricity with the L1 line terminal of the power supply cabinet, the output connection bar of the inner coil is connected to the input connection bar of the outer coil, and the output connection bar of the outer coil is used to conduct electricity with the L2 line terminal of the power supply cabinet. The height of the inner coil is greater than the height of the outer coil but less than the height of the furnace lining.

[0006] Optionally, the position adjustment assembly includes a support plate and a mounting component, the mounting component including a detachably connected fixing part and an adjustment part; The support plate has through holes for the inner coil to pass through, and the outer coil can overlap the support plate and be sleeved on the inner coil. The fixing part is fixedly disposed on the mounting frame, and the adjusting part can be used to adjust the position of the support plate relative to the mounting frame.

[0007] Optionally, the fixing part is constructed as a screw, and the adjusting part is constructed as an adjusting nut; The support plate has through holes; The screw is vertically arranged, and its bottom end is fixedly connected to the mounting bracket. The top end of the screw is used to pass through the adjusting nut and the through hole in sequence, so that the bottom surface of the support plate is in contact with the top surface of the adjusting nut.

[0008] Optionally, the mounting component further includes a locking part, which is configured as a locking nut. The locking nut is configured to be threadedly connected to the screw so that the top surface of the support plate is fitted against the bottom surface of the locking nut.

[0009] Optionally, the mounting members are provided in at least two, and the at least two mounting members are arranged at circumferential intervals along the furnace lining; The number of through holes corresponds one-to-one with the number of mounting brackets.

[0010] Optionally, the diameter of the through hole is larger than the outer diameter of the inner coil and smaller than the outer diameter of the outer coil.

[0011] Optionally, the heating assembly further includes a heat insulation layer; The heat insulation layer is provided between the furnace lining and the inner coil.

[0012] Optionally, the bottle-shaped metal workpiece necking heating device further includes two cable outlets disposed on the mounting frame; The two outlet bars are arranged symmetrically about the furnace lining in a first direction. Each outlet bar includes an outlet bar body, a first connecting bar and a second connecting bar. The first connecting bar is provided at one end of each outlet bar body and the second connecting bar is provided at the other end of each outlet bar body. The first connecting bar of one of the two outgoing cable bodies is electrically connected to the L1 terminal of the power supply cabinet. The input connecting bar of the inner coil is electrically connected to the second connecting bar of one of the two outgoing cable bodies. The output connecting bar of the inner coil is electrically connected to the input connecting bar of the outer coil. The output connecting bar of the outer coil is electrically connected to the second connecting bar of the other of the two outgoing cable bodies. The first connecting bar of the other of the two outgoing cable bodies is electrically connected to the L2 terminal of the power supply cabinet.

[0013] Optionally, there are multiple heating components, and the multiple heating components are arranged at intervals along the second direction on the mounting frame; The number of second connecting rows on each of the said outlet busbars is multiple and corresponds one-to-one with the number of the heating components; The first direction and the second direction are perpendicular to each other.

[0014] This disclosure also provides a heating method, which is implemented using the above-described heating device, and the heating method includes: The bottle-shaped metal workpiece to be closed is vertically inserted into the heating channel, so that the closing area of ​​the bottle-shaped metal workpiece is located in the inner cavity of the furnace lining. By applying intermediate frequency AC power to the L1 and L2 terminals through the power cabinet, the current flows sequentially through the inner coil and the movable outer coil to form a series induction circuit. The inner coil is used to perform overall induction heating on the constricted area of ​​the bottle-shaped metal workpiece to form a basic temperature distribution; Based on the axial temperature gradient required for the target closing process, the height position of the outer coil relative to the inner coil is adjusted using a position adjustment component so that it covers the local area that needs enhanced heating. The outer coil generates an additional eddy current thermal effect in the local area, which is superimposed on the basic temperature distribution, thereby creating a controllable temperature gradient in the constriction area. After gradient heating is completed, the bottle-shaped metal workpiece is subjected to a necking and forming operation.

[0015] Compared with existing technologies, the beneficial effects of this invention are as follows: Through the arrangement of the furnace lining, inner coil, and outer coil, since the inner coil is sleeved around the outer periphery of the furnace lining and its height is less than the height of the furnace lining, the overlapping portion of the inner coil and the furnace lining can form the basic heating area required for the closing of the bottle-shaped metal workpiece, enabling the entire bottle-shaped metal workpiece to achieve a uniform and stable preheating effect. Since the outer coil is sleeved outside the inner coil and its height is less than the height of the inner coil, the overlapping portion of the inner and outer coils can form a locally enhanced heating area required for the closing of the bottle-shaped metal workpiece. Within this locally enhanced heating area, the alternating magnetic fields generated by the inner and outer coils (inner and outer coils) superimpose, significantly enhancing the induction intensity, thereby forming a temperature peak at the corresponding axial position of the bottle-shaped metal workpiece. In other words, the superposition of the magnetic fields of the two coils can significantly increase the local energy density and shorten the heating time. Furthermore, through the established position adjustment component, the outer coil can be moved up and down along the outer wall of the inner coil to the target position according to process requirements (e.g., the high-temperature zone of the bottle-shaped metal workpiece to be heated needs to be located at the upper 1 / 3 of its opening). After adjustment, the outer and inner coils can form an axially overlapping configuration, thereby establishing the required temperature peak in the corresponding area of ​​the opening of the bottle-shaped metal workpiece. No sensor replacement is required; only the position of the outer coil needs to be adjusted to adapt to bottle-shaped metal workpieces of different specifications, thus significantly reducing production line changeover time.

[0016] Compared to traditional bottle-shaped metal workpiece necking heating devices that use a single-layer coil, the bottle-shaped metal workpiece necking heating device disclosed herein utilizes an inner coil and a movable outer coil to form a double-layer coaxial series circuit structure. Combined with a position adjustment component, the height of the outer coil relative to the inner coil is adjusted to achieve dynamic control of the heating temperature gradient. Without replacing the inductor or reprocessing the coil structure, it can be quickly adapted to bottle-shaped metal workpieces of different diameters, lengths, or materials through mechanical adjustment alone, significantly improving the device's versatility and avoiding the complexity of multi-power source synchronous control.

[0017] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a perspective view of a bottle-shaped metal workpiece necking heating device provided in an exemplary embodiment of this disclosure; Figure 2This is a front view of a bottle-shaped metal workpiece necking heating device provided in an exemplary embodiment of this disclosure; Figure 3 This is a top view of a bottle-shaped metal workpiece necking heating device provided in an exemplary embodiment of this disclosure.

[0019] In the diagram: 10. Mounting bracket; 20. Heating assembly; 21. Furnace lining; 211. Heating channel; 22. Inner coil; 221. Input connection bar of the inner coil; 222. Output connection bar of the inner coil; 23. Outer coil; 231. Input connection bar of the outer coil; 232. Output connection bar of the outer coil; 30. Position adjustment assembly; 31. Support plate; 32. Mounting component; 321. Fixing part; 322. Adjusting part; 323. Locking part; 40. Outlet bar; 41. Outlet bar body; 42. First connection bar; 43. Second connection bar. Detailed Implementation

[0020] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0021] In the description of this disclosure, it should be understood that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on... Figure 1 The orientations shown in the drawings are defined solely for the convenience of describing this disclosure and for simplification, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or a specific orientation construction and operation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, the terms "inner" and "outer" refer to the inner and outer contours of the corresponding structures. In addition, the terms "first," "second," etc., are only used to distinguish one element from another and do not have any sequential or importance.

[0022] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connect," "link," and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0023] like Figures 1 to 3As shown, this disclosure provides a bottle-shaped metal workpiece necking heating device, including a mounting frame 10, a heating assembly 20, and a position adjustment assembly 30. Both the heating assembly 20 and the position adjustment assembly 30 are mounted on the mounting frame 10. The heating assembly 20 includes a furnace lining 21, an inner coil 22, and an outer coil 23. The furnace lining 21 extends vertically and is mounted on the mounting frame 10. The furnace lining 21 has an upward-facing heating channel 211 for accommodating the bottle-shaped metal workpiece. The inner coil 22 is set... Located in the furnace lining 21, the outer coil 23 is mounted on the position adjustment assembly 30 and movably sleeved on the inner coil 22 through the position adjustment assembly 30. The input connection bar 221 of the inner coil is used to conduct electricity with the L1 line terminal of the power supply cabinet. The output connection bar 222 of the inner coil is connected to the input connection bar 231 of the outer coil. The output connection bar 232 of the outer coil is used to conduct electricity with the L2 line terminal of the power supply cabinet. The height of the inner coil 22 is greater than the height of the outer coil 23 and less than the height of the furnace lining 21.

[0024] It should be understood that the electrical connection of this device can be as follows: from the L1 end of the power supply cabinet to the input end of the inner coil 22, then from the output end of the inner coil 22 to the input end of the outer coil 23, and finally from the output end of the outer coil 23 to the L2 end of the power supply cabinet. This connection forms a series circuit, allowing the same current to flow through the inner and outer coils (inner coil 22 and outer coil 23), thereby generating an alternating magnetic field with the same frequency and phase. In the overlapping area, the magnetic field is superimposed, significantly improving the local induction intensity and heating power density.

[0025] Through the above technical solution, with the furnace lining 21, inner coil 22, and outer coil 23, the inner coil 22, being sleeved around the outer periphery of the furnace lining 21 and with a height less than that of the furnace lining 21, forms the basic heating area required for the bottle-shaped metal workpiece to close, ensuring uniform and stable preheating of the entire workpiece. The outer coil 23, being sleeved outside the inner coil 22 and with a height less than that of the inner coil 22, forms the locally enhanced heating area required for the bottle-shaped metal workpiece to close. Within this locally enhanced heating area, the alternating magnetic fields generated by the inner and outer coils (inner coil 22 and outer coil 23) superimpose, significantly increasing the induction intensity and creating a temperature peak at the corresponding axial position of the bottle-shaped metal workpiece. In other words, the superposition of the magnetic fields from the two coils significantly increases the local energy density and shortens the heating time. Furthermore, through the position adjustment component 30, the outer coil 23 can be moved up and down along the outer wall of the inner coil 22 to the target position according to process requirements (e.g., the high-temperature zone of the bottle-shaped metal workpiece to be heated needs to be located at the upper 1 / 3 of its opening). After adjustment, the outer coil 23 and the inner coil 22 can form an axially overlapping configuration, thereby establishing the required temperature peak in the corresponding area of ​​the opening of the bottle-shaped metal workpiece. Without replacing the sensor, only the position of the outer coil 23 needs to be adjusted to adapt to bottle-shaped metal workpieces of different specifications, thus significantly shortening production line changeover time.

[0026] Compared to traditional bottle-shaped metal workpiece necking heating devices that use a single-layer coil, the bottle-shaped metal workpiece necking heating device disclosed herein utilizes an inner coil 22 and a movable outer coil 23 to form a double-layer coaxial series circuit structure. Combined with a position adjustment component 30, the height of the outer coil 23 relative to the inner coil 22 is adjusted to achieve dynamic control of the heating temperature gradient. Without replacing the inductor or reprocessing the coil structure, it can be quickly adapted to bottle-shaped metal workpieces of different diameters, lengths, or materials through mechanical adjustment alone, significantly improving the device's versatility and avoiding the complexity of multi-power source synchronous control.

[0027] Optionally, the furnace lining 21 can be made of a high-temperature resistant insulating material. This high-temperature resistant insulating material can be alumina ceramic, quartz, or high-purity refractory fiber; this disclosure does not impose any limitations on this.

[0028] Optionally, the height of the inner coil 22 can be 2 to 3 times the height of the outer coil 23.

[0029] If the height of the inner coil 22 is too small (e.g., only slightly larger than the outer coil 23), it will be difficult to form a sufficiently wide basic heating area, and it will be unable to effectively support the overall preheating of the bottle-shaped metal workpiece.

[0030] If the inner coil 22 is too high (e.g., more than 3 times the height of the outer coil 23), although it can cover a longer area, it may cause overheating of the non-sealing area, resulting in energy waste or expansion of the heat-affected zone.

[0031] Setting the height of the inner coil 22 to be 2 to 3 times that of the outer coil 23 ensures that the basic heating section required for the entire closing process is covered, while also providing sufficient adjustment stroke for the outer coil 23, enabling it to form flexible and controllable local high-temperature zones at different axial positions, thereby balancing heating uniformity and gradient control accuracy.

[0032] As one implementation method, such as Figures 1 to 2 As shown, the position adjustment assembly 30 includes a support plate 31 and a mounting member 32. The mounting member 32 includes a fixing part 321 and an adjusting part 322 that are detachably connected. The support plate 31 has a through hole for the inner coil 22 to pass through. The outer coil 23 can overlap the support plate 31 and be sleeved on the inner coil 22. The fixing part 321 is fixedly disposed on the mounting frame 10. The adjusting part 322 can be used to adjust the position of the support plate 31 relative to the mounting frame 10.

[0033] By cooperating with the fixing part 321 and the adjusting part 322, the support plate 31 and the outer coil 23 on it can be moved along the axial direction of the inner coil 22, thereby adjusting the height position of the outer coil 23 relative to the inner coil 22.

[0034] Among them, the support plate 31 can serve as a carrier for the outer coil 23, so that the movement trajectory of the outer coil 23 can be in a straight and stable state.

[0035] As one implementation method, such as Figures 1 to 3 As shown, the fixing part 321 is constructed as a screw, the adjusting part 322 is constructed as an adjusting nut, a through hole is formed on the support plate 31, the screw is vertically arranged, the bottom end of the screw is fixedly connected to the mounting bracket 10, and the top end of the screw is used to pass through the adjusting nut and the through hole in sequence, so that the bottom surface of the support plate 31 is in contact with the top surface of the adjusting nut.

[0036] First, the initial position of the support plate 31 is determined, roughly defining the initial overlap area between the inner coil 22 and the outer coil 23. Then, by rotating the adjusting nut, it is moved up and down along the vertically positioned screw to the target height. At this point, the adjusting nut, acting as a load-bearing support structure, has its top surface in contact with the bottom surface of the support plate 31, thus stably supporting the support plate 31 at the required height. Next, the outer coil 23 is placed on the support plate 31, ensuring it is coaxially fitted around the outer periphery of the inner coil 22, placing it at the preset axial position determined by the height of the support plate 31. Thus, the outer coil 23 and the inner coil 22 form the expected axial overlap area at this position, which corresponds to the locally enhanced heating area required for the closing of the bottle-shaped metal workpiece.

[0037] In other words, by adjusting the axial position of the adjusting nut on the screw, the height of the support plate 31 can be precisely controlled, thereby dynamically adjusting the position of the outer coil 23 relative to the inner coil 22, ultimately achieving flexible control over the height of the overlapping area of ​​the inner and outer coils. This mechanism allows the heating temperature gradient to be quickly adapted to the process requirements of different bottle-shaped metal workpieces without the need for hardware replacement, significantly improving the versatility and ease of operation of the device.

[0038] As one implementation method, such as Figures 1 to 2 As shown, the mounting component 32 also includes a locking part 323, which is configured as a locking nut. The locking nut is configured to be threaded onto the screw so that the top surface of the support plate 31 fits against the bottom surface of the locking nut.

[0039] Once the support plate 31 and its outer coil 23 are in the ideal position, screw the locking nut into the screw and tighten it, ensuring a tight fit between the bottom surface and the top surface of the support plate 31. At this point, the locking nut and the adjusting nut work together to firmly clamp the support plate 31 between them, ensuring its stability and safety during the heating process. The introduction of the locking nut creates a secure mechanism that effectively prevents the support plate 31 from shifting position due to vibration or impact during heating operation, thus improving the overall reliability of the device.

[0040] As one implementation method, such as Figures 1 to 2 As shown, there are at least two mounting pieces 32, which are spaced apart around the circumference of the furnace lining 21. The number of through holes corresponds one-to-one with the number of mounting brackets 10.

[0041] The multi-point force-bearing design can avoid tilting or swaying caused by a single-sided cantilever, so that the support plate 31 can remain stable during adjustment and operation.

[0042] In one implementation, the diameter of the through hole is larger than the outer diameter of the inner coil 22 and smaller than the outer diameter of the outer coil 23.

[0043] The through-hole size is reasonably designed, which is conducive to the normal arrangement of the inner coil 22 and can effectively support the outer coil 23, thus avoiding unnecessary interference.

[0044] In one embodiment, the heating assembly 20 also includes an insulation layer, which is provided between the furnace lining 21 and the inner coil 22.

[0045] In this way, the heat in the heating channel 211 can be prevented from being conducted outward through the furnace lining 21 to the inner coil 22, the support structure, and even the mounting bracket 10. This effectively prevents a large amount of heat in the heating channel 211 from being lost to the non-working area, thereby improving heating efficiency and reducing power consumption.

[0046] Alternatively, the insulation layer can be made of ceramic fiber, aluminum silicate fiber, or nanoporous insulation material; this disclosure does not impose any restrictions on this.

[0047] As one implementation method of a dual-coil series circuit electrical connection, such as Figure 1 and Figure 3 As shown, the bottle-shaped metal workpiece closing heating device also includes two cable outlets 40 mounted on the mounting frame 10. The two cable outlets 40 are arranged symmetrically about the furnace lining 21 in a first direction. Each cable outlet 40 includes a cable outlet body 41, a first connecting bar 42, and a second connecting bar 43. One end of each cable outlet body 41 is provided with a first connecting bar 42, and the other end of each cable outlet body 41 is provided with a second connecting bar 43. The first connecting bar 42 of one of the two cable outlet bodies 41 is used to be electrically connected to the L1 line terminal of the power supply cabinet. The input connecting bar 221 of the inner coil is electrically connected to the second connecting bar 43 of one of the two cable outlet bodies 41. The output connecting bar 222 of the inner coil is electrically connected to the input connecting bar 231 of the outer coil. The output connecting bar 232 of the outer coil is electrically connected to the second connecting bar 43 of the other cable outlet body 41. The first connecting bar 42 of the other cable outlet body 41 is used to be electrically connected to the L2 line terminal of the power supply cabinet.

[0048] The two cable outlets 40 are arranged symmetrically about the central axis of the furnace lining 21 along the first direction (specifically, the width direction of the mounting bracket 10) to optimize the current path, reduce electromagnetic interference, and improve structural stability. Among them, the outgoing line 40 is fixed to the mounting bracket 10 as an independent module. The wiring terminal positions are clearly defined, which facilitates quick connection between the power cabinet and the coil, and also makes maintenance and replacement easier.

[0049] As one implementation method, such as Figures 1 to 3As shown, there are multiple heating components 20, which are arranged at intervals along the second direction on the mounting frame 10. The number of second connecting bars 43 on each output bar body 41 is multiple and corresponds one-to-one with the number of heating components 20. The first direction and the second direction are arranged perpendicularly.

[0050] The parallel structure distributes the total current across all branches, reducing the current-carrying requirements of each branch and facilitating matching with the intermediate frequency power supply capacity. Furthermore, adding or removing heating stations only requires adding or removing the corresponding branches, allowing for flexible system expansion.

[0051] Each heating component 20 can be configured with an independent switch, current sensor or power adjustment module to enable on-demand start / stop or differentiated power output, suitable for mixed-line production of bottle-shaped metal workpieces of different specifications or zoned gradient heating of long shells.

[0052] Among them, the multi-connection-point outgoing line 40 is suitable for parallel wiring, and each second connection line 43 can be used as an independent electrical node. The wiring is clear, does not interfere with each other, and is easy to integrate protection devices.

[0053] like Figures 1 to 3 As shown, this disclosure also provides a heating method, which is implemented using the above-described heating device, and the heating method includes: The bottle-shaped metal workpiece to be closed is vertically inserted into the heating channel 211, so that the closing area of ​​the bottle-shaped metal workpiece is located in the inner cavity of the furnace lining 21. The power supply cabinet applies intermediate frequency AC power to the L1 and L2 terminals, so that the current flows sequentially through the inner coil 22 and the movable outer coil 23 to form a series induction circuit. The inner coil 22 is used to perform overall induction heating on the constricted area of ​​the bottle-shaped metal workpiece to form a basic temperature distribution; Based on the axial temperature gradient required for the target closing process, the position adjustment component 30 is used to adjust the height position of the outer coil 23 relative to the inner coil 22 so that it covers the local area that needs to be heated. The outer coil 23 generates an additional eddy current heating effect in a local area, which is superimposed on the basic temperature distribution, thereby creating a controllable temperature gradient in the closing area. After gradient heating is completed, the bottle-shaped metal workpiece is closed and formed.

[0054] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0055] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0056] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A heating device for closing the mouth of a bottle-shaped metal workpiece, characterized in that, Includes a mounting bracket (10), a heating assembly (20), and a position adjustment assembly (30); The heating component (20) and the position adjustment component (30) are both mounted on the mounting bracket (10); The heating assembly (20) includes a furnace lining (21), an inner coil (22) and an outer coil (23). The furnace lining (21) extends in the vertical direction and is mounted on the mounting frame (10). The furnace lining (21) has an upward-opening heating channel (211) for accommodating bottle-shaped metal workpieces. The inner coil (22) is sleeved on the furnace lining (21), and the outer coil (23) is installed on the position adjustment component (30) and movably sleeved on the inner coil (22) through the position adjustment component (30). The input connection bar (221) of the inner coil is used to be electrically connected to the L1 line terminal of the power supply cabinet. The output connection bar (222) of the inner coil is electrically connected to the input connection bar (231) of the outer coil. The output connection bar (232) of the outer coil is used to be electrically connected to the L2 line terminal of the power supply cabinet. The height of the inner coil (22) is greater than the height of the outer coil (23) and less than the height of the furnace lining (21).

2. The bottle-shaped metal workpiece necking heating device according to claim 1, characterized in that, The position adjustment assembly (30) includes a support plate (31) and a mounting component (32), the mounting component (32) including a detachably connected fixing part (321) and an adjustment part (322). The support plate (31) has a through hole for the inner coil (22) to pass through, and the outer coil (23) can overlap the support plate (31) and be sleeved on the inner coil (22); The fixing part (321) is fixedly disposed on the mounting frame (10), and the adjusting part (322) can be used to adjust the position of the support plate (31) relative to the mounting frame (10).

3. The bottle-shaped metal workpiece necking heating device according to claim 2, characterized in that, The fixing part (321) is constructed as a screw, and the adjusting part (322) is constructed as an adjusting nut; The support plate (31) has through holes; The screw is set vertically, and the bottom end of the screw is fixedly connected to the mounting bracket (10). The top end of the screw is used to pass through the adjusting nut and the through hole in sequence, so that the bottom surface of the support plate (31) is in contact with the top surface of the adjusting nut.

4. The bottle-shaped metal workpiece necking heating device according to claim 3, characterized in that, The mounting component (32) also includes a locking part (323), which is configured as a locking nut. The locking nut is configured to be threadedly connected to the screw so that the top surface of the support plate (31) fits against the bottom surface of the locking nut.

5. The bottle-shaped metal workpiece necking heating device according to claim 4, characterized in that, The mounting component (32) is provided in at least two parts, and the at least two mounting components (32) are arranged at circumferential intervals along the furnace lining (21); The number of the through holes corresponds one-to-one with the number of the mounting brackets (10).

6. The bottle-shaped metal workpiece necking heating device according to claim 2, characterized in that, The diameter of the through hole is larger than the outer diameter of the inner coil (22) and smaller than the outer diameter of the outer coil (23).

7. The bottle-shaped metal workpiece necking heating device according to claim 1, characterized in that, The heating component (20) also includes a heat insulation layer; The heat insulation layer is provided between the furnace lining (21) and the inner coil (22).

8. The bottle-shaped metal workpiece necking heating device according to any one of claims 1-7, characterized in that, The bottle-shaped metal workpiece closing heating device also includes two cable outlets (40) disposed on the mounting frame (10). The two outlet rows (40) are arranged symmetrically about the furnace lining (21) in a first direction. Each outlet row (40) includes an outlet row body (41), a first connecting row (42) and a second connecting row (43). The first connecting row (42) is provided at one end of each outlet row body (41), and the second connecting row (43) is provided at the other end of each outlet row body (41). The first connecting bar (42) of one of the two outgoing line bodies (41) is electrically connected to the L1 line terminal of the power supply cabinet. The input connecting bar (221) of the inner coil is electrically connected to the second connecting bar (43) of one of the two outgoing line bodies (41). The output connecting bar (222) of the inner coil is electrically connected to the input connecting bar (231) of the outer coil. The output connecting bar (232) of the outer coil is electrically connected to the second connecting bar (43) of the other of the two outgoing line bodies (41). The first connecting bar (42) of the other of the two outgoing line bodies (41) is electrically connected to the L2 line terminal of the power supply cabinet.

9. The bottle-shaped metal workpiece necking heating device according to claim 8, characterized in that, There are multiple heating components (20), and the multiple heating components (20) are arranged at intervals along the second direction on the mounting frame (10); The number of second connecting bars (43) on each of the said outlet bar bodies (41) is multiple and corresponds one-to-one with the number of the heating components (20); The first direction and the second direction are perpendicular to each other.

10. A heating method, characterized in that, The heating method is implemented using the heating device according to any one of claims 1-8, and the heating method includes: The bottle-shaped metal workpiece to be closed is vertically inserted into the heating channel (211) so that the closing area of ​​the bottle-shaped metal workpiece is located in the inner cavity of the furnace lining (21); Medium-frequency AC power is applied to the L1 and L2 terminals through the power supply cabinet, so that the current flows through the inner coil (22) and the movable outer coil (23) in sequence to form a series induction circuit; The inner coil (22) is used to perform overall induction heating on the constricted area of ​​the bottle-shaped metal workpiece to form a basic temperature distribution; According to the axial temperature gradient required by the target closing process, the height position of the outer coil (23) relative to the inner coil (22) is adjusted by the position adjustment component (30) so that it covers the local area that needs to be heated. The outer coil (23) generates an additional eddy current thermal effect in the local area, which is superimposed on the basic temperature distribution, thereby creating a controllable temperature gradient in the constriction area. After gradient heating is completed, the bottle-shaped metal workpiece is subjected to a necking and forming operation.

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