A metal heating system

Abstract

The utility model relates to motor maintenance technical field, concretely disclose a kind of metal heating system that can avoid motor shell and motor stator damage, reduce maintenance cost and reduce maintenance workload, improve the operating efficiency of stator operation, the metal heating system includes induction heating equipment, main controller and at least one heating unit, heating unit includes heating box and temperature detection mechanism;Induction heating equipment includes the inductive heating host computer of heating box outside, is housed in heating box and is electrically connected with the inductive coil of inductive heating host computer, inductive coil is wound along annular path in heating box and is enclosed and is used for the heating area of housing to be heated motor shell and extends along vertical direction;The detection end of temperature detection mechanism corresponds heating area and detects motor shell heating temperature, main controller is electrically connected with inductive heating host computer and temperature detection mechanism.

Description

Technical Field

[0001] This utility model relates to the field of motor repair technology, and in particular to a metal heating system for removing the stator of a motor. Background Technology

[0002] During motor operation, stator failures often cause short circuits, short wires, and stator lamination detachment, among other problems. In such cases, it is necessary to remove the stator from the motor housing (i.e., "stator removal") and repair it. Since the stator is tightly fitted to the motor housing during installation, current stator removal operations primarily involve cutting the housing with a hand grinder, damaging the housing to remove the stator. This method renders the entire motor housing unusable, requiring simultaneous replacement and increasing maintenance costs. Furthermore, improper operation during the housing cutting process can easily lead to the blade contacting the stator, causing further damage and increasing maintenance workload. Removing the stator by cutting the housing is typically done manually, which is time-consuming and reduces the efficiency of stator removal. Utility Model Content

[0003] Therefore, it is necessary to provide a metal heating system that can avoid damage to the motor housing and motor stator, reduce maintenance costs and workload, and improve the efficiency of stator removal operations, in order to address the above-mentioned shortcomings.

[0004] A metal heating system includes an induction heating device, a main controller, and at least one heating unit. The heating unit includes a heating chamber and a temperature detection mechanism. The induction heating device includes an induction heating host located outside the heating chamber and an induction coil housed inside the heating chamber and electrically connected to the induction heating host. The induction coil is wound along a circular path inside the heating chamber to form a heating zone for housing the housing of a motor to be heated and extending vertically. The detection end of the temperature detection mechanism corresponds to the heating zone and detects the heating temperature of the motor housing. The main controller is electrically connected to the induction heating host and the temperature detection mechanism.

[0005] In one embodiment, the induction coil includes a first portion wound along a circular path inside a heating chamber and a second portion located above the first portion and wound along the circular path. The first portion and the second portion are electrically connected and together form the heating zone. The projected area of ​​the first portion in the horizontal plane is greater than the projected area of ​​the second portion in the horizontal plane.

[0006] In one embodiment, the temperature detection mechanism includes a first infrared thermometer fixed on the heating box and corresponding to the first part, and a second infrared thermometer fixed on the heating box and corresponding to the second part.

[0007] In one embodiment, the heating chamber is provided with a plurality of support rods located outside the induction coil and fixedly connected to the induction coil, and at least some of the support rods are fixedly connected to the heating chamber.

[0008] In one embodiment, the surface of the induction coil is provided with an insulating and heat-insulating protective plate, which is an alumina ceramic plate, a calcium silicate plate, or a ceramic fiber plate.

[0009] In one embodiment, the metal heating system further includes a control cabinet, in which the induction heating host and the main controller are housed, and the control cabinet is also equipped with a power module electrically connected to the induction heating host.

[0010] In one embodiment, the outer surface of the control cabinet is provided with a control panel and an audible and visual alarm that are electrically connected to the main controller.

[0011] In one embodiment, the metal heating system further includes a cooling pipe housed in a control cabinet and adjacent to the induction heating host, and an industrial chiller located outside the control cabinet. One end of the cooling pipe passes through the control cabinet and is connected to the outlet of the industrial chiller, and the other end of the cooling pipe passes through the control cabinet and is connected to the inlet of the industrial chiller. A flow meter for detecting water flow and a temperature sensor for detecting water temperature are installed on the cooling pipe, both located in the control cabinet. The flow meter and the temperature sensor are electrically connected to the main controller.

[0012] In one embodiment, the induction heating device further includes at least one induction heating sub-unit located outside the control cabinet and electrically connected to the induction heating main unit, the induction heating sub-unit being electrically connected to the induction coil inside the heating box.

[0013] In one embodiment, the induction heating host is a medium-frequency heating machine, and the main controller is a PLC controller or a microcontroller.

[0014] The metal heating system of this invention includes an induction coil arranged inside a heating chamber to form a heating zone. When the motor housing is placed in the heating zone, the induction heating host operates under the control of the main controller, applying alternating current to the induction coil. This generates an alternating electromagnetic field inside and around the induction coil. This alternating electromagnetic field acts on the motor housing within the heating zone, causing eddy currents to form in the motor housing. These eddy currents flow inside the motor housing and collide with metal atoms within the motor housing, generating heat and rapidly raising the temperature of the motor housing. The heated motor housing expands, increasing its volume, which in turn increases the temperature of the connection between the motor housing and the motor stator. The system uses a disconnecting mechanism to separate the motor stator and the motor housing, facilitating stator removal. This replaces manual cutting of the motor housing. After the stator is removed, the motor housing can be restored by cooling, avoiding damage and scrapping of the motor housing, thus reducing maintenance costs. Heating the motor housing minimizes damage to the stator, preventing scratches and increased maintenance workload caused by cutting. Automatic heating of the motor housing via induction coils shortens stator removal time and improves efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a metal heating system in one embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the metal heating system after the control cabinet door and the heating box side panel have been removed in one embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the heating box in one embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of the heating box after one side plate has been removed in one embodiment of the present invention. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0020] This utility model discloses a metal heating system that can avoid damage to the motor housing and stator, reduce maintenance costs and workload, and improve the efficiency of stator removal operations. This metal heating system is used for stator removal in motors. By heating the motor housing (typically aluminum), it utilizes the principle of thermal expansion and contraction to cause the motor housing to expand, separating the connection between the motor housing and the stator. This allows for stator removal without damaging the motor housing (which can be restored to its original state by cooling), facilitating the repair of faulty motor stators. In practical applications, the metal heating system can also be used for heating other metals, electronic appliances, and products in heat-fitting processes (using the physical principle of thermal expansion and contraction to achieve interference fit assembly).

[0021] For specific details, please refer to... Figure 1-4 The metal heating system 10 of this embodiment includes an induction heating device, a main controller 100, and at least one heating unit. Each heating unit includes a heating chamber 200 and a temperature detection mechanism 300; that is, each heating chamber 200 has a corresponding temperature detection mechanism 300 to detect its heating temperature. The induction heating device includes an induction heating host 400 located outside the heating chamber 200 and an induction coil 500 housed inside the heating chamber 200 and electrically connected to the induction heating host 400. The induction coil 500 is wound along a circular path inside the heating chamber 200 to form a heating zone for accommodating the motor housing 20 to be heated (the motor housing contains a motor stator) and extending vertically. This ensures that when the motor housing is placed in the heating zone, the surrounding area of ​​the motor housing is completely surrounded by the induction coil 500, resulting in uniform heating of the motor housing. The detection end of the temperature detection mechanism 300 corresponds to the heating zone and detects the heating temperature of the motor housing. The main controller 100 is electrically connected to the induction heating host 400 and the temperature detection mechanism 300. Preferably, in this embodiment, the main controller 100 is a PLC controller or a microcontroller.

[0022] The induction heating equipment provides an energy source for heating the motor casing. The induction heating host 400 is connected to the induction coil 500 via a feeder line to achieve an electrical connection between them. The induction heating host 400 is used to receive industrial frequency AC power (50 / 60Hz low-frequency AC power). Internally, it includes a rectifier circuit for converting the industrial frequency AC power into DC power, and an inverter circuit connected to the rectifier circuit for inverting the DC power into higher-frequency AC power. After converting the industrial frequency AC power into high-frequency AC power, the induction heating host 400 transmits the high-frequency AC power to the induction coil 500 via the feeder line. When high-frequency alternating current passes through the induction coil 500, a concentrated and powerful alternating magnetic field is generated within and around the area enclosed by the induction coil 500 (the heating zone). When a motor housing (i.e., a metal workpiece) is located within the heating zone, this alternating magnetic field acts on the motor housing, inducing and forming eddy currents inside the motor housing (not the internal space enclosed by the motor housing itself, but rather the interior of the material constituting the motor housing). These eddy currents flow inside the motor housing and collide with the metal atoms within it, generating heat and rapidly raising the temperature of the motor housing to achieve the purpose of heating it. In this scenario, the heat generated during the heating of the motor housing is produced inside the motor housing itself. Due to the rapid heating rate, the oxidation of the motor housing is minimal, resulting in high heating efficiency and good process repeatability.

[0023] Furthermore, in this embodiment, the induction heating host 400 is a medium-frequency heating machine. The high-frequency alternating current generated by the medium-frequency heating machine has a frequency range of 1kHz to 10kHz. When heating metal workpieces, it can achieve a deep heating depth, ranging from several millimeters to tens of millimeters. Its good heat penetration allows it to heat the interior of the motor housing as well, thus satisfying the heating requirements of the motor housing. Since the high-frequency alternating current generated by the high-frequency heating machine has a frequency range of 50kHz to 200kHz, its maximum heating depth can be several millimeters. Therefore, even when the motor housing is relatively thin, the high-frequency heating machine can still be used to heat the motor housing.

[0024] It should be noted that the heating motor housing 20 in this embodiment includes a cylindrical body, a semi-cylinder fixed to the side of the cylindrical body, a strip structure connecting the cylindrical body and the semi-cylinder, a racetrack-shaped base fixed to the bottom of the cylindrical body, and a frustum structure fixed to the upper surface of the racetrack-shaped base and located to the side of the cylindrical body. The conical surface of the frustum structure abuts against the lower surfaces of the semi-cylinder and the strip structure, and the upper surfaces of the cylindrical body, the semi-cylinder, and the strip structure are flush. Furthermore, the induction coil 500 includes a first portion 510 wound along an annular path inside the heating chamber 200, and a second portion 520 located above the first portion 510 and wound along an annular path. The first portion 510 and the second portion 520 are electrically connected, and the first portion 510 and the second portion 520 together form a heating area. The projected area of ​​the first portion 510 in the horizontal plane is larger than the projected area of ​​the second portion 520 in the horizontal plane. One side of the second portion 520 is flush with the first portion 510, and the other side of the second portion 520 is suspended relative to the first portion 510. The first part 510 surrounds the lower part of the cylindrical body, the lower part of the strip structure, the lower part of the semi-cylinder, the racetrack-shaped base, and the frustum structure. The second part 520 surrounds the upper part of the cylindrical body, the upper part of the strip structure, and the upper part of the semi-cylinder. The projection of the first part 510 on the horizontal plane is a racetrack-shaped structure, and the projection of the second part 520 on the horizontal plane is a pear-shaped structure. In this way, the induction coil 500 can be placed as close as possible to the annular side of the motor housing, so that the alternating magnetic field generated around the induction coil 500 has a stronger effect on the motor housing, thereby improving the heating effect of the motor housing.

[0025] The surface of the induction coil 500 is provided with an insulating and heat-insulating protective plate, which may be an alumina ceramic plate, a calcium silicate plate, or a ceramic fiber plate. In this embodiment, the induction coil 500 is made of a hollow copper tube, through which a high-frequency current flows. By providing an insulating and heat-insulating protective plate on the surface of the induction coil 500, irregular structures on the surface of the motor housing can be prevented from accidentally touching the induction coil 500, thereby preventing a strong electrical short circuit. This achieves physical isolation between the induction coil 500 and the motor housing and protects operators from direct contact with the energized coil. Furthermore, the insulating and heat-insulating protective plate can also reflect the heat generated by the motor housing when it is heated, thus preventing the induction coil 500 from overheating. In addition, the insulating and heat-insulating protective plate can also be used to mechanically support and position the induction coil 500, preventing it from deforming after long-term use or under stress, thereby extending the service life of the induction coil 500. To further position the induction coil 500, the heating chamber 200 is equipped with multiple support rods 210 located outside the induction coil 500 and fixedly connected to it. At least some of the support rods 210 are fixedly connected to the heating chamber 200. Specifically, a support rod 210 is provided around each of the four sides of the induction coil 500. These four support rods 210 are fixedly connected to the top and bottom plates of the heating chamber 200, respectively. In addition, a support rod 210 is also provided at the suspended part on the second part 520 to connect and position the multi-turn induction coil 500 at the suspended part and prevent deformation from occurring there.

[0026] In one embodiment, the temperature detection mechanism 300 includes a first infrared thermometer 310 fixed to the heating chamber 200 and corresponding to the first part 510, and a second infrared thermometer 320 fixed to the heating chamber 200 and corresponding to the second part 520. The first infrared thermometer 310 and the second infrared thermometer 320 are respectively fixed to the outer wall of the heating chamber 200 via angle brackets. A first detection hole corresponding to the detection end of the first infrared thermometer 310 and a second detection hole corresponding to the detection end of the second infrared thermometer 320 are provided on the side plate of the heating chamber 200. That is, the first infrared thermometer 310 and the second infrared thermometer 320 are externally placed in the heating chamber 200. This allows for the detection of the heating temperature of the motor casing while reducing the heat radiation emitted by the motor casing to the first infrared thermometer 310 and the second infrared thermometer 320 during heating. In this embodiment, by setting the first infrared thermometer 310 and the second infrared thermometer 320, different parts within the heating zone are heated respectively, facilitating the understanding of the heating temperature of different parts within the heating zone and determining whether the motor casing is heated uniformly. In addition, in this embodiment, each side plate of the heating box 200 is provided with a number of heat dissipation holes 220. Since the alternating magnetic field generated by the induction coil 500 is mainly concentrated in the heating zone, and the motor housing is heated very quickly under the action of eddy current, the setting of the heat dissipation holes 220 can ensure that the motor housing is effectively heated, while also helping to exhaust the hot air inside the heating box 200 and avoid the heating box 200 from overheating.

[0027] In one embodiment, the metal heating system 10 further includes a control cabinet 600, in which the induction heating host 400 and the main controller 100 are housed to provide encapsulation and protection for the induction heating host 400 and the main controller 100. The control cabinet 600 also contains a power module 610 electrically connected to the induction heating host 400. This power module 610 is used to connect to external AC power to provide AC power to the induction heating host 400. Furthermore, the outer surface of the control cabinet 600 is provided with a control panel and an audible and visual alarm (not shown) electrically connected to the main controller 100. The control panel includes a display screen 620 and switches and related controls 630 located beside the display screen 620. When the metal heating system 10 is operating, the main controller 100 can send the temperature signal collected by the temperature detection structure to the display screen 620 for display, so that operators can understand the heating temperature of the motor casing.

[0028] It should be noted that in this embodiment, the metal heating system 10 also includes a timing module electrically connected to the main controller 100. Before the motor housing is placed in the heating chamber 200 and heated, the main controller 100 controls the induction heating host 400 to start and sets the heating temperature of the motor housing by adjusting the power of the induction heating host 400 (for example, setting the heating temperature to 200 degrees Celsius). During the heating process, PID control (proportional-integral-derivative control) is used to gradually increase the temperature and stabilize it at the preset temperature. When the heating temperature reaches the preset temperature, the first infrared thermometer 310 and the second infrared thermometer 320 send the collected temperature signals to the main controller 100, which then controls the power of the induction heating host 400 to maintain a constant temperature (heat preservation). When the timing module detects that the heat preservation time has been reached, the main controller 100 can control the display screen 620 to display corresponding indication information or control the audible and visual alarm to activate as a reminder. In addition, when the heating time of the induction heating host 400 exceeds the preset value, and the main controller 100 does not receive a temperature signal detected by the first infrared thermometer 310 and / or the second infrared thermometer 320, the main controller 100 controls the audible and visual alarm to sound an alarm. When the difference between the temperature value detected by the first infrared thermometer 310 and the temperature value detected by the second infrared thermometer 320 (temperature difference) is greater than the set value, the main controller 100 controls the audible and visual alarm to sound an alarm to prevent uneven heating of the motor casing. When the temperature value detected by either the first infrared thermometer 310 or the second infrared thermometer 320 exceeds the set value, an alarm can be triggered after a delay to avoid false alarms. When the induction heating host 400 receives a heating signal, the timing module starts timing. When the preset heating time is reached, and the temperature value detected by the first infrared thermometer 310 and / or the second infrared thermometer 320 has not reached the preset value, the main controller 100 controls the audible and visual alarm to sound an alarm. Once the heating temperature reaches the preset value and enters the heat preservation state, the power output of the induction heating host 400 is detected. If it exceeds the set output power for a preset time (e.g., ten seconds), the main controller 100 controls the audible and visual alarm to sound an alarm. In addition, the metal heating system 10 is also equipped with a serial port or network port electrically connected to the main controller 100. This serial port or network port communicates with upstream or downstream equipment in the production process via a connecting cable, allowing the upstream or downstream equipment to obtain the heating temperature and alarm information of the metal heating system 10.

[0029] The metal heating system 10 also includes a cooling pipe 700 housed within a control cabinet 600 and adjacent to the induction heating host 400, and an industrial chiller 800 located outside the control cabinet 600. One end of the cooling pipe 700 passes through the control cabinet 600 and connects to the outlet of the industrial chiller 800, while the other end passes through the control cabinet 600 and connects to the inlet of the industrial chiller 800. A flow meter 710 for detecting water flow and a temperature sensor 720 for detecting water temperature are installed on the cooling pipe 700, both located within the control cabinet 600. Both the flow meter 710 and the temperature sensor are electrically connected to the main controller 100. Preferably, in this embodiment, the cooling pipe 700 is located below the induction heating host 400, and the cooling pipe 700 is connected to the industrial chiller via an inlet and outlet pipe located outside the control cabinet. When cooling water flows into the cooling pipe 700, the cooling pipe 700 exchanges heat with the cooling water and cools down. Simultaneously, the cooling pipe 700 further exchanges heat with the air inside the control cabinet 600 and the induction heating host 400, causing the temperature of the induction heating host 400 to drop, thus preventing overheating during operation. By installing a flow meter 710 and a temperature sensor 720 on the cooling pipe 700, the flow rate signal of the cooling water collected by the flow meter 710 can be used to determine the operation of the industrial chiller 800. The main controller 100 can only control the induction heating host 400 to operate when the detection value of the flow meter 710 reaches a preset value, in order to protect the induction heating host 400. When the flow meter 710 and temperature sensor 720 malfunction or the detection value exceeds the preset value, such as when the cooling water flow is insufficient or the cooling water temperature is too high, the main controller 100 controls the audible and visual alarm to sound an alarm and controls the induction heating host 400 to shut down. In this embodiment, the cooling pipe 700 uses PPR water pipes.

[0030] Furthermore, the induction heating device also includes at least one induction heating sub-unit 900 located outside the control cabinet 600 and electrically connected to the induction heating main unit 400. The induction heating sub-unit 900 is electrically connected to the induction coil 500 inside the heating chamber 200. In other embodiments, when multiple heating units are provided, the induction heating device includes multiple induction heating sub-units 900, each electrically connected to the induction coil 500 inside each heating chamber 200. Each induction heating sub-unit 900 is connected to the main controller 100. Thus, the main controller 100 can independently heat multiple motor housings by controlling the power of each induction heating sub-unit 900. By using an induction heating main unit 400 in conjunction with multiple induction heating sub-units 900, the induction heating main unit 400 provides the power source, converting the power frequency from the grid to output the required medium frequency power. The induction heating sub-units 900 act as heating workstations, independently controlling their respective induction coils 500. This achieves a one-to-many working mode, improving equipment utilization and production efficiency. The power of one induction heating main unit 400 can be shared by multiple workstations in a time-sharing manner, avoiding the waste of power supplies allocated to each workstation being in standby mode most of the time. This greatly improves the utilization rate of the induction heating main unit 400 and enables centralized control and maintenance of the workstations.

[0031] The metal heating system 10 of this invention includes an induction coil 500 arranged inside a heating box 200 to form a heating zone. When the motor housing is placed in the heating zone, the induction heating host 400 operates under the control of the main controller 100, applying an alternating current to the induction coil 500. This generates an alternating electromagnetic field inside and around the induction coil 500. This alternating electromagnetic field acts on the motor housing within the heating zone, causing eddy currents to be generated in the motor housing. These eddy currents flow inside the motor housing and collide with metal atoms within the motor housing, thereby generating heat and rapidly heating the motor housing. The heated motor housing expands, increasing in volume, thus increasing the temperature of the motor housing. The connection between the stator and the motor housing is disconnected, facilitating the removal of the stator. This system replaces the manual cutting of the motor housing. After the stator is removed, the motor housing can be restored by cooling, avoiding damage to the motor housing and reducing maintenance costs. Heating the motor housing prevents damage to the stator, avoiding scratches and increased maintenance workload caused by cutting. Automatic heating of the motor housing using an induction coil shortens the stator removal time and improves efficiency.

[0032] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0033] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A metal heating system, characterized in that, The device includes an induction heating device, a main controller, and at least one heating unit. The heating unit includes a heating chamber and a temperature detection mechanism. The induction heating device includes an induction heating host located outside the heating chamber and an induction coil housed inside the heating chamber and electrically connected to the induction heating host. The induction coil is wound along a circular path inside the heating chamber to form a heating zone for housing the housing of a motor to be heated and extending vertically. The detection end of the temperature detection mechanism corresponds to the heating zone and detects the heating temperature of the motor housing. The main controller is electrically connected to the induction heating host and the temperature detection mechanism.

2. The metal heating system according to claim 1, characterized in that, The induction coil includes a first part wound along a circular path inside the heating chamber and a second part located above the first part and wound along the circular path. The first part and the second part are electrically connected and together form the heating zone. The projected area of ​​the first part in the horizontal plane is greater than the projected area of ​​the second part in the horizontal plane.

3. The metal heating system according to claim 2, characterized in that, The temperature detection mechanism includes a first infrared thermometer fixed on the heating box and corresponding to the first part, and a second infrared thermometer fixed on the heating box and corresponding to the second part.

4. The metal heating system according to claim 1, characterized in that, The heating box is provided with a plurality of support rods located outside the induction coil and fixedly connected to the induction coil, and at least some of the support rods are fixedly connected to the heating box.

5. The metal heating system according to claim 1, characterized in that, The surface of the induction coil is provided with an insulating and heat-insulating protective plate, which is an alumina ceramic plate, a calcium silicate plate, or a ceramic fiber plate.

6. The metal heating system according to claim 1, characterized in that, The metal heating system also includes a control cabinet, in which the induction heating host and the main controller are housed. The control cabinet also contains a power module that is electrically connected to the induction heating host.

7. The metal heating system according to claim 6, characterized in that, The outer surface of the control cabinet is equipped with a control panel and an audible and visual alarm that are electrically connected to the main controller.

8. The metal heating system according to claim 6, characterized in that, The metal heating system also includes a cooling pipe housed in a control cabinet and adjacent to the induction heating host, and an industrial chiller located outside the control cabinet. One end of the cooling pipe passes through the control cabinet and is connected to the outlet of the industrial chiller, and the other end of the cooling pipe passes through the control cabinet and is connected to the inlet of the industrial chiller. A flow meter for detecting water flow and a temperature sensor for detecting water temperature are installed on the cooling pipe, both located in the control cabinet. The flow meter and the temperature sensor are electrically connected to the main controller.

9. The metal heating system according to claim 6, characterized in that, The induction heating equipment also includes at least one induction heating sub-unit located outside the control cabinet and electrically connected to the induction heating main unit, wherein the induction heating sub-unit is electrically connected to the induction coil inside the heating box.

10. The metal heating system according to claim 1, characterized in that, The induction heating host is a medium-frequency heating machine, and the main controller is a PLC controller or a microcontroller.

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