An electromagnetic heating device and a single-screw extruder

Abstract

This utility model discloses an electromagnetic heating device and a single-screw extruder, belonging to the technical field of single-screw extruders. It includes a heat dissipation assembly, a control assembly, and a heating body for heating the object to be heated. The heating body includes a first half-shell, a second half-shell, and a connecting unit. The two sides of the first half-shell are hinged to one side of the second half-shell and one side of the controller, respectively. The other side of the second half-shell is detachably connected to the side of the first half-shell opposite the controller. The side of the second half-shell opposite the controller is movably abutted against the controller via the connecting unit, allowing the controller to rotate relative to the heating body for adjustment and maintenance angle. A space for heating the object to be heated is formed between the first and second half-shells. The middle part of the second half-shell is connected to a radiator for heat dissipation from the heating body. The controller is electrically connected to the heating body. This utility model facilitates the maintenance and repair of the controller and the electromagnetic heating coil.

Description

Technical Field

[0001] This utility model relates to the field of single-screw extruder technology, and in particular to an electromagnetic heating device and a single-screw extruder. Background Technology

[0002] The single-screw extruder was developed based on the single-screw extruder. Due to its good feeding performance, mixing and plasticizing performance, venting performance and extrusion stability, it is now widely used in the molding and processing of extruded products.

[0003] The controllers and electromagnetic coils of the electromagnetic heating devices in existing single-screw extruders are prone to damage and difficult to repair. Specifically, the controllers of traditional electromagnetic heating devices are usually fixed and cannot be adjusted, making maintenance and repair inconvenient. Utility Model Content

[0004] In view of this, it is necessary to provide an electromagnetic heating device and a single-screw extruder to solve the problem of the difficulty in maintenance and repair of existing electromagnetic heating devices.

[0005] In a first aspect, this utility model provides an electromagnetic heating device, comprising: Heat dissipation assembly, the heat dissipation assembly including a heat sink; Control component, the control component including a controller; A heating body for heating an object to be heated includes a first half-shell, a second half-shell, and a connecting unit. The two sides of the first half-shell are hinged to one side of the second half-shell and one side of the controller, respectively. The other side of the second half-shell is detachably connected to the side of the first half-shell opposite the controller. The side of the second half-shell opposite the controller is movably abutted against the controller via the connecting unit. The controller can rotate relative to the heating body for adjusting its angle. A space for heating the object is formed between the first and second half-shells. The middle part of the second half-shell is connected to the radiator for dissipating heat from the heating body. The controller is electrically connected to the heating body.

[0006] Furthermore, the first half-shell, the second half-shell, and the controller have a folded state and an unfolded state. In the folded state, the first half-shell and the second half-shell are joined together to form an annular heating element, and the second half-shell abuts against the controller through a connecting unit. In the unfolded state, the joining surfaces of the first half-shell and the second half-shell are set at 180° and are parallel to the end of the controller to expose the working areas of the first half-shell and the second half-shell.

[0007] Furthermore, the connecting unit includes a female buckle connected to the second half-shell and a male buckle connected to the controller. The male buckle can be inserted into the female buckle to fix the second half-shell and the controller.

[0008] Furthermore, the connection unit includes a first magnet connected to the second half-shell and a second magnet connected to the controller. The first magnet can be magnetically connected to the second magnet to fix the second half-shell and the controller.

[0009] Furthermore, the first half-shell includes a C-shaped outer shell and a heating inner core, the heating inner core being embedded in the inner cavity of the C-shaped outer shell, the second half-shell having the same structure as the first half-shell, and the heating inner core being electrically connected to the controller via a cable.

[0010] Furthermore, the inner cavity of the C-shaped outer shell is coated with a nano-aerogel coating.

[0011] Furthermore, the heat dissipation assembly also includes a heat dissipation channel that runs through the first half-shell and the second half-shell, the heat dissipation channel being in communication with the inner cavity of the annular heating element, and the heat sink being disposed relative to the heat dissipation channel.

[0012] Furthermore, the controller includes a housing for encapsulating electronic components and a connecting bracket. The housing has multiple heat dissipation holes arranged in an array. One side of the connecting bracket is fixedly connected to the housing, and the other side of the connecting bracket is connected to the first half-shell and the connecting unit, respectively.

[0013] Furthermore, the controller also includes a heat sink, with the middle portion of the connecting bracket recessed inward relative to the housing to form an installation space for the heat sink, and the heat sink connected to the housing via heat sink fins.

[0014] Secondly, this utility model provides a single-screw extruder, comprising: an electromagnetic heating device and a barrel for extruding raw materials, wherein the heating body is sleeved on the barrel and the heating body is capable of heating the barrel.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model discloses an electromagnetic heating device and a single-screw extruder, comprising a heating body including a first half-shell, a second half-shell, and a connecting unit. The first half-shell is hinged to one side of the second half-shell and one side of the controller, respectively. The other side of the second half-shell is detachably connected to the side of the first half-shell opposite the controller. The side of the second half-shell opposite the controller is movably abutted against the controller via the connecting unit. The connecting unit transmits pressure from the controller to the second half-shell, providing robust support for the controller and maintaining its operational stability. Simultaneously, one side of the controller can freely detach from the connecting unit, allowing it to rotate relative to the heating body and exposing its various end faces, thus facilitating disassembly and maintenance by maintenance personnel. The first and second half-shells can be relatively open, providing space for maintenance and repair of both halves. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of the entire utility model; Figure 2 This is the usage state of this utility model. Figure 1 ; Figure 3 This is the usage state of this utility model. Figure 2 ; Figure 4 This is the usage state of this utility model. Figure 3 ; Figure 5 yes Figure 1 A magnified structural diagram of point M; Figure 6 yes Figure 2 A schematic diagram of the cross-section viewed along the AA direction; Figure 7 This is a side view of the overall structure of this utility model; Figure 8 yes Figure 7 A schematic diagram of the cross-section viewed along the BB direction; Figure 9 This is a schematic diagram of the structure of the first half-shell in this utility model; Figure 10 This is a schematic diagram of the control component in this utility model; Figure 11 This is a schematic diagram of the heat dissipation component in this utility model.

[0017] 100. Heat dissipation components; 110. Radiator; 200. Control component; 210. Controller; 211. Housing; 211a. Heat dissipation hole; 211b. Heat sink; 212. Connecting bracket; 220. Heat sink component; 300. Heating body; 310. First half-shell; 311. C-shaped outer shell; 312. Heating inner core; 320. Second half-shell; 330. Connecting unit; 331. Female buckle; 332. Male buckle; 340. Heat dissipation channel. Detailed Implementation

[0018] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0019] This embodiment of an electromagnetic heating device and a single-screw extruder relates to the field of single-screw extruder technology. By providing a rotatable and detachable structure between the controller 210 and the heating body 300, and between the two half-shells of the heating body 300, it is helpful to maintain and repair the controller 210 and the electromagnetic heating coil.

[0020] Please see Figures 1 to 11 This embodiment of an electromagnetic heating device includes a heat dissipation component 100, a control component 200, and a heating body 300. The heat dissipation component 100 can effectively dissipate heat from the entire electromagnetic heating device, preventing overheating of any part of the heating device. The control component 200 can regulate the heating efficiency of the electromagnetic heating device. The heat dissipation component 100 includes a radiator 110, and the control component 200 includes a controller 210. The radiator 110 and the controller 210 work in conjunction with the heating body 300 to control the heating intensity and dissipate heat from the heating body 300 when it is heating the material to be heated.

[0021] The heating body 300 includes a first half-shell 310, a second half-shell 320, and a connecting unit 330. The first half-shell 310 is hinged to one side of the second half-shell 320 and one side of the controller 210 on both sides, respectively. The other side of the second half-shell 320 is detachably connected to the side of the first half-shell 310 opposite to the controller 210. The side of the second half-shell 320 opposite to the controller 210 is movably abutted against the controller 210 via the connecting unit 330. The connecting unit 330 can transmit pressure from the controller 210 to the second half-shell 320, providing robust support for the controller 210 and maintaining its operational stability. Simultaneously, one side of the controller 210 can freely detach from the connecting unit 330, allowing it to rotate relative to the heating body 300 and exposing its various end faces, thus facilitating disassembly and maintenance of the controller 210 by maintenance personnel. A space for heating the object to be heated is formed between the first half-shell 310 and the second half-shell 320. The first half-shell 310 and the second half-shell 320 can be relatively open, providing space for maintenance of the first half-shell 310 and the second half-shell 320.

[0022] The second half-shell 320 is connected to the radiator 110 in the middle. The radiator 110 can directly dissipate heat to the interior of the heating body 300 through the second half-shell 320, avoiding local overheating and malfunctions. The controller 210 is electrically connected to the heating body 300 through wires, thereby effectively regulating the heating power of the heating body 300 to adapt to different materials.

[0023] It should be noted that the radiator 110 is a wind-powered radiator 110. A guide plate is provided between the radiator 110 and the second half-shell 320. The guide plate can promote the uniform distribution of the airflow delivered to the heating body 300, which helps to evenly distribute the heat.

[0024] In some embodiments, please refer to Figures 2 to 4 The first half-shell 310, the second half-shell 320, and the controller 210 have folded and unfolded states. In the folded state, the first half-shell 310 and the second half-shell 320 are joined to form an annular heating element, and the second half-shell 320 abuts against the controller 210 through a connecting unit 330. In the unfolded state, the mating surfaces of the first half-shell 310 and the second half-shell 320 are set at 180° and parallel to the end of the controller 210, and the second half-shell 320 abuts against the ground to expose the working areas of the first half-shell 310 and the second half-shell 320.

[0025] In the folded state, the first half-shell 310 and the second half-shell 320 are closed to form a ring structure. Specifically, the hinge mechanism can be used to lock the mating surfaces closed, allowing the heating device to form a complete ring-shaped heating body to improve heating efficiency. In the unfolded state, the first half-shell 310 and the second half-shell 320 are fully unfolded to a planar state. Specifically, the rotation angle of the hinge mechanism can be limited to allow the mating surfaces to unfold to 180°. The inner sides of the second half-shell 320 and the first half-shell 310 are oriented upwards, so that the working area of ​​the heating body 300 is fully exposed for easy maintenance. The working area is the area where the electromagnetic coils or heating elements are located inside the first half-shell 310 and the second half-shell 320. In the unfolded state, the heating elements that were originally covered by the ring structure are fully exposed, allowing operators to directly maintain or replace the heating elements.

[0026] During use, when maintenance is required, the operator can rotate the controller 210 around the hinge point. At this time, the second half-shell 320 remains in contact with the controller 210 via the connecting unit 330, bearing the weight of the controller 210. During rotation, the radiator 110 remains connected to the middle of the second half-shell 320, ensuring continuous heat dissipation. In the unfolded state, the first half-shell 310 and the second half-shell 320 are separated by 180°, exposing the internal heating elements, allowing maintenance personnel to directly access the faulty part. In the folded state, the two half-shells close to form an annular heating cavity. The connecting unit 330 secures the position of the second half-shell 320 via a mechanical lock, ensuring structural stability during heating operations.

[0027] In some embodiments, please refer to Figure 5 The connection unit 330 includes a female buckle 331 connected to the second half-shell 320 and a male buckle 332 connected to the controller 210. The male buckle 332 can be inserted into the female buckle 331 to fix the second half-shell 320 and the controller 210.

[0028] In practical implementation, the female buckle 331 refers to the connecting component fixed to the second half-shell 320, which can be implemented using a metal fastener with a slot. The inner wall of the slot can be provided with an elastic snap-fit ​​structure to enhance the fixing effect. The male buckle 332 refers to the mating component fixed to the controller 210, which can be implemented using a metal plug with a raised structure. The surface of the raised structure can be provided with anti-slip texture to improve insertion stability. Through the insertion and mating of the male buckle 332 and the female buckle 331, the second half-shell 320 and the controller 210 can be quickly assembled and disassembled.

[0029] Specifically, when the second half-shell 320 needs to be connected to the controller 210, the protruding structure of the male buckle 332 is inserted into the slot of the female buckle 331 until the elastic snap-fit ​​structure locks the protruding structure. At this time, the second half-shell 320 and the controller 210 form a rigid connection, preventing displacement due to vibration. When separation is required, the locking can be released by pressing the elastic snap-fit ​​structure. The insertion direction of the male buckle 332 and the female buckle 331 can be set to be perpendicular to the axis of the heating body 300.

[0030] As an alternative implementation, the connection unit 330 includes a first magnet connected to the second half-shell 320 and a second magnet connected to the controller 210. The first magnet can be magnetically connected to the second magnet, thereby fixing the second half-shell 320 and the controller 210.

[0031] In the specific implementation, the first magnet is a magnetic material mounted on the second half-shell 320, specifically a neodymium iron boron magnet, used to generate an attractive force during docking. The second magnet is a magnetic material mounted on the controller 210, specifically a ferrite magnet, whose magnetic pole distribution corresponds to the first magnet to form a magnetic attraction. Magnetic connection refers to fixing components through the attractive force between magnetic materials; the attraction strength can be controlled by adjusting the magnet area and spacing.

[0032] Specifically, when the second half-shell 320 needs to be connected to the controller 210, the operator brings the two close to a set distance. At this time, the first magnet and the second magnet generate an attractive force due to their polarity matching, causing the second half-shell 320 to automatically adhere and fix to the controller 210. During maintenance, the components can be separated by applying external force to overcome the magnetic attraction. This connection method can be completed without the need for tools, and repeated operations will not cause thread wear or snap breakage.

[0033] Compared to existing technologies, traditional connection methods often use bolt fixing or welding structures, requiring tools and being time-consuming to assemble and disassemble. This solution, through a plug-in connection structure or magnetic structure, enables quick assembly and disassembly without tools, while avoiding problems such as thread wear or weld breakage caused by repeated disassembly.

[0034] In some embodiments, please refer to Figures 6 to 9 The first half-shell 310 includes a C-shaped outer shell 311211 and a heating inner core 312. The heating inner core 312 is embedded in the inner cavity of the C-shaped outer shell 311211. The second half-shell 320 has the same structure as the first half-shell 310. The heating inner core 312 is electrically connected to the control component 200 through a cable. Under the control of the control component 200, the heating inner core 312 can generate an alternating magnetic field and use eddy currents for heating.

[0035] In practical implementation, the C-shaped outer shell 311211 refers to a shell structure with an open annular cross-section, which can be manufactured using metal stamping forming process. The open structure facilitates the enclosure of the heating core 312 and the formation of an electromagnetic field circuit. The heating core 312 refers to a heating unit composed of an electromagnetic coil and insulating material, which can be made by winding copper wire into a spiral shape and wrapping it with high-temperature resistant resin, directly generating an alternating magnetic field that acts on the heated object. The heating core 312 is completely embedded in the installation space reserved in the outer shell 211. The end of the C-shaped outer shell 311211 is provided with a cover plate, which is connected to the main body of the C-shaped outer shell 311211 by bolts or a snap-fit ​​structure to form an independent installation cavity, the inner size of which matches the shape of the heating core 312.

[0036] Specifically, the heating core 312 is completely embedded into the inner cavity of the outer shell 211 during assembly, and the gap between the outer shell 211 and the core is filled by injection molding to form a fixed structure. The second half-shell 320 adopts the same structure, and the two half-shells are joined together to form a complete annular heating element. The cable is led out from the wire hole reserved in the side wall of the outer shell 211 and connected to the power interface of the control component 200 by plugging in.

[0037] Compared to existing technologies, the coils of traditional electromagnetic heating devices are directly exposed on the surface of the outer shell 211, making them susceptible to damage from external impacts. This solution completely embeds the heating core 312 into the C-shaped outer shell 311211, forming a double-layer protective structure. The outer shell 211 serves as both an electromagnetic shielding layer and a mechanical protection layer. Furthermore, the modular semi-shell design allows for easy removal of the heating core 312 during maintenance simply by disassembling the outer shell 211, without damaging the overall device structure.

[0038] In some embodiments, the inner cavity of the C-shaped outer shell 311211 is coated with a nano-aerogel coating. The nano-aerogel coating can block heat transfer and prevent the inner core 312 from overheating and interfering with the operation of electronic components.

[0039] In practical implementation, the nano-aerogel coating is a heat-insulating material layer composed of nano-sized aerogel particles. Specifically, it can be formed into a uniform covering layer on the inner surface of the C-shaped outer shell 311211 through spraying or brushing processes. The coating reduces the transfer of heat from inside the outer shell 211 to the controller 210 and electromagnetic coil by reducing thermal conductivity, thereby avoiding aging of electronic components caused by high temperatures. Specifically, during the operation of the electromagnetic heating device, when the heat generated by the heating core 312 is transferred through the C-shaped outer shell 311211, the nano-aerogel coating, due to its low thermal conductivity, prevents the heat from diffusing towards the controller 210. The coating covers the inner surface of the outer shell 211, for example, by using a spraying process to form a continuous layer with a thickness of 0.1-0.5 mm, ensuring that heat is mainly dissipated along the preset heat dissipation channel 340. This coating remains stable in high-temperature environments, preventing cracking due to thermal expansion, thereby maintaining its thermal insulation performance. In some embodiments, please refer to Figure 8 and Figure 9 The heat dissipation assembly 100 also includes a heat dissipation channel 340 that runs through the first half-shell 310 and the second half-shell 320. The heat dissipation channel 340 is connected to the inner cavity of the annular heating body. The radiator 110 is disposed relative to the heat dissipation channel 340 and can blow air into the heat dissipation channel 340 to dissipate heat from the heating body 300.

[0040] In practical implementation, the heat dissipation channel 340 is a through-flow airflow channel that runs through the first half-shell 310 and the second half-shell 320. It can be implemented using a metal tubular structure or an internal air duct structure to guide airflow in circulation within the heating body 300. The inner cavity of the annular heating element is a closed annular space formed by the docking of the first half-shell 310 and the second half-shell 320. This can be achieved through a sealing design of the docking surface, and it is used to accommodate the heating element and transfer heat.

[0041] The setting of the heat sink 110 relative to the heat dissipation channel 340 means that the installation position of the heat sink 110 corresponds to the extension direction of the heat dissipation channel 340. Specifically, it can be achieved by using an axial fan or a heat dissipation fin array to accelerate heat exchange within the heat dissipation channel 340.

[0042] Specifically, the heat dissipation channel 340 spans the docking area between the first half-shell 310 and the second half-shell 320, forming a continuous airflow path within the inner cavity of the annular heating element. When the radiator 110 is activated, the airflow enters from one end of the heat dissipation channel 340, passes through the high-temperature area inside the heating body 300, and then carries heat out from the other end. The positional correspondence between the radiator 110 and the heat dissipation channel 340 allows heat to be quickly dissipated, preventing localized overheating. In the folded state, the inner cavity of the annular heating element is connected to the external environment through the heat dissipation channel 340, further enhancing heat dissipation efficiency.

[0043] Compared with existing technologies, traditional electromagnetic heating devices typically rely on a single radiator 110 for passive heat dissipation, without a through-type heat dissipation channel 340, resulting in heat accumulation inside the heating body 300. This solution achieves active airflow circulation through the synergistic effect of the through-type heat dissipation channel 340 and the radiator 110, significantly improving the uniformity of heat dissipation.

[0044] In some embodiments, please refer to Figure 10 The controller 210 includes a housing 211 for encapsulating electronic components and a connecting bracket 212. The housing 211 has multiple heat dissipation holes 211a arranged in an array. These holes help dissipate heat from the housing 211, preventing heat generated by the electronic components from accumulating in the housing and causing equipment malfunction. One side of the connecting bracket 212 is fixedly connected to the housing 211, and the other side is connected to the first half-shell 310 and the connecting unit 330, respectively. The connecting bracket 212 acts as an intermediary between the housing 211 and the first half-shell 310 and the second half-shell 320, facilitating connection between them. The controller 210 also includes a heat sink 220. The middle portion of the connecting bracket 212 is recessed inward relative to the housing 211 to form a mounting space for the heat sink 220. The heat sink 220 is connected to the housing 211 via a heat sink 211b, further promoting heat dissipation from the heat sink 220 to the controller 210.

[0045] In some embodiments, the housing 211 refers to a shell structure used to house and protect internal electronic components, specifically made of aluminum alloy or engineering plastic, with heat dissipation holes 211a on its surface to promote air convection and reduce internal temperature. The connecting bracket 212 refers to a support structure used to fix the housing 211 and connect it to other components, specifically made of stamped or injection-molded metal, and is combined with the housing 211 by bolts or welding to achieve modular installation of the controller 210. The heat dissipation holes 211a refer to ventilation holes arranged in a regular pattern, specifically arranged in a circular, square, or diamond array, increasing heat dissipation area and improving heat dissipation efficiency. The mounting space formed by the recess in the middle of the connecting bracket 212 refers to the cavity area formed by the partial inward bending of the bracket, specifically formed by stamping, used to house the heat sink 220 and provide it with a fixed position. The heat sink 211b refers to a heat-conducting metal sheet connected to the housing 211, specifically made of copper or aluminum, which quickly dissipates heat from the inside of the controller 210 through heat conduction.

[0046] Specifically, the outer casing 211 achieves uniform heat dissipation through an array of heat dissipation holes 211a, preventing localized overheating that could damage electronic components. One side of the connecting bracket 212 is fixed to the outer casing 211, while the other side connects to the first half-shell 310 and the connecting unit 330, ensuring structural stability of the controller 210 when adjusting its maintenance angle. A heat sink 220 is embedded in the recessed mounting space in the middle of the connecting bracket 212. The heat sink 220 is in close contact with the outer casing 211 through heat sink fins 211b, conducting internal heat to the surface of the outer casing 211 and dissipating it through the heat dissipation holes 211a.

[0047] Compared with existing technologies, traditional controllers 210 typically use a closed housing 211 and lack a directional heat dissipation structure, which leads to heat accumulation and accelerated component aging. This solution forms a three-dimensional heat dissipation path by combining arrayed heat dissipation holes 211a with heat sinks 211b, and integrates heat sinks 220 using the recessed structure of the connecting bracket 212, achieving efficient heat conduction within a limited space.

[0048] This application further proposes a single-screw extruder, including an electromagnetic heating device and a barrel 400 for extruding raw materials. A heating body 300 is sleeved on the barrel 400 and can heat the barrel 400, thereby causing the solid plastic particles in the barrel 400 to melt into a molten state.

[0049] In practical implementation, a single-screw extruder refers to a device that achieves plastic conveying, compression, melting, and extrusion forming through the rotation of a single screw. Specifically, it can be implemented using a metal barrel 400 with a temperature control system in conjunction with the screw to meet the processing requirements of different materials. The barrel 400 is a cylindrical structure used to house the screw and complete the plasticizing and extruding of the material. It can be made of a high-temperature resistant alloy material, and its outer surface can be provided with annular grooves to accommodate the installation of the heating body 300. The first half-shell 310 and the second half-shell 320 are fitted onto the barrel 400 in an annular structure through a hinged connection and a detachable connecting unit 330, facilitating quick disassembly and maintenance.

[0050] Specifically, the heating body 300 encloses the outer wall of the barrel 400 through a split half-shell structure, and uniformly heats the barrel 400 under the adjustment of the control component 200. When maintenance is required, the second half-shell 320 can detach from the controller 210 and unfold to a position touching the ground. At this time, the working areas of the first half-shell 310 and the second half-shell 320 are fully exposed, facilitating maintenance of the heating core 312, the heat dissipation channel 340, and the cables. The heat dissipation component 100 is connected to the inner cavity of the barrel 400 through the radiator 110, continuously dissipating the heat generated during the heating process and preventing damage to electronic components of the controller 210 due to overheating.

[0051] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within this utility model.

Claims

1. An electromagnetic heating device, characterized by, include: Heat dissipation assembly, the heat dissipation assembly including a heat sink; Control component, the control component including a controller; The heating body includes a first half-shell, a second half-shell, and a connecting unit. Two sides of the first half-shell are hinged to one side of the second half-shell and one side of the controller, respectively. The other side of the second half-shell is detachably connected to the side of the first half-shell opposite the controller. The side of the second half-shell opposite the controller is movably abutted against the controller via the connecting unit. The controller can rotate relative to the heating body for adjusting the maintenance angle. A space for heating the object to be heated is formed between the first and second half-shells. The middle part of the second half-shell is connected to the radiator for heat dissipation from the heating body. The controller is electrically connected to the heating body.

2. An electromagnetic heating device according to claim 1, wherein The first half-shell, the second half-shell, and the controller have a folded state and an unfolded state. In the folded state, the first half-shell and the second half-shell are joined together to form an annular heating element, and the second half-shell abuts against the controller through a connecting unit. In the unfolded state, the joining surfaces of the first half-shell and the second half-shell are set at 180° and are parallel to the end of the controller to expose the working areas of the first half-shell and the second half-shell.

3. An electromagnetic heating device according to claim 1, wherein The connection unit includes a female buckle connected to the second half-shell and a male buckle connected to the controller. The male buckle can be inserted into the female buckle to fix the second half-shell and the controller.

4. An electromagnetic heating device according to claim 1, wherein The connection unit includes a first magnet connected to the second half-shell and a second magnet connected to the controller. The first magnet can be magnetically connected to the second magnet to fix the second half-shell and the controller.

5. An electromagnetic heating device according to claim 1, wherein The first half-shell includes a C-shaped outer shell and a heating inner core. The heating inner core is embedded in the inner cavity of the C-shaped outer shell. The second half-shell has the same structure as the first half-shell. The heating inner core is electrically connected to the controller via a cable.

6. An electromagnetic heating device according to claim 5, wherein The inner cavity of the C-shaped shell is coated with a nano-aerogel coating.

7. An electromagnetic heating device according to claim 2, wherein The heat dissipation assembly further includes a heat dissipation channel that runs through the first half-shell and the second half-shell. The heat dissipation channel is connected to the inner cavity of the annular heating element, and the radiator is positioned relative to the heat dissipation channel.

8. An electromagnetic heating device according to claim 1, wherein The controller includes a housing for encapsulating electronic components and a connecting bracket. The housing has multiple heat dissipation holes arranged in an array. One side of the connecting bracket is fixedly connected to the housing, and the other side of the connecting bracket is connected to the first half-shell and the connecting unit, respectively.

9. An electromagnetic heating device according to claim 8, characterised in that The controller also includes a heat sink, and the middle part of the connecting bracket is recessed inward relative to the housing to form an installation space for the heat sink. The heat sink is connected to the housing via a heat sink fin.

10. A single screw extruder characterized by, include: An electromagnetic heating device and a barrel for extruding raw materials as described in any one of claims 1-9, wherein the heating body is sleeved on the barrel and the heating body is capable of heating the barrel.

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