Intermediate frequency induction heating furnace structure

Abstract

The present application belongs to the technical field of medium frequency induction heating furnace, and particularly relates to a medium frequency induction heating furnace structure, which comprises a furnace shell, an induction coil, a shielding ring, a heating body, a carrier, a heat insulation plate and a temperature measuring assembly arranged in the furnace shell. The induction coil and the heating body are each provided with three groups and are uniformly distributed along the length direction of the furnace shell. The shielding ring is provided with four groups and is staggered with the three groups of induction coils. The induction coil is sleeved on the outer surface of the corresponding heating body, and the adjacent two heating bodies are gap-fitted at the opposite ends. The present application can realize the axial temperature homogenization by the cooperative heating of the multiple heating bodies in the long rod mode, and can realize the independent, efficient and non-damage heating of a single or multiple short rods by selectively activating a single or multiple heating bodies and physically isolating by the heat insulation plate in the short rod mode, thereby overcoming the three technical problems of the existing long hearth heating furnace, i.e. large axial temperature difference of long rod, high energy consumption and easy adhesion of short rod, and difficult switching of production mode.

Description

Technical Field

[0001] This invention belongs to the technical field of medium-frequency induction heating furnaces, and particularly relates to a structure of a medium-frequency induction heating furnace. Background Technology

[0002] Medium-frequency induction heating furnaces employ indirect heating, where coils heat the heating element, which in turn radiates heat to the internal tungsten-molybdenum rods. This method is widely used in the heat treatment of refractory metals. In existing equipment, the heating element is an integral structure, powered by a single set of coils, and the furnace chamber length is fixed.

[0003] However, a medium-frequency induction heating furnace used for heating long tungsten-molybdenum rods may also be used for heating short tungsten-molybdenum rods to reduce equipment investment costs. However, this type of furnace has the following drawbacks in actual use: 1. Short rod heating: When a single short rod is placed in the heating element, the entire long heating element needs to be heated to the process temperature, resulting in significant energy waste. Furthermore, it is difficult to place the short rod in a uniform magnetic field area during feeding, leading to a large axial temperature difference. If multiple short rods are fed end-to-end to improve heating efficiency and reduce energy waste, the ends are prone to sticking and sparking, resulting in a high product scrap rate. Therefore, this furnace has significant limitations in meeting the heating needs of both long and short rods.

[0004] 2. Long rod heating: The heating element dissipates heat strongly from both ends to the furnace shell, while the middle is well insulated, resulting in a temperature distribution that is "higher in the middle and lower at both ends." Simply increasing the total power will exacerbate overheating in the middle, and there is a lack of system solutions that take into account both end compensation and middle suppression.

[0005] Therefore, there is an urgent need for a heating furnace that can achieve independent control of the axial temperature zones of the heating element. It can obtain a uniform axial thermal field of long rods through unequal power distribution and heating elements with gradually varying wall thickness, and can also flexibly switch to short rod mode to achieve efficient and damage-free batch heating of multiple short rods. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a medium-frequency induction heating furnace structure to solve the issues mentioned in the background section.

[0007] To achieve the above objectives, this application provides the following technical solution: The present invention provides a medium-frequency induction heating furnace structure, including a furnace shell and induction coils, shielding rings, heating elements, a carrier, heat insulation plates, and temperature measuring components disposed within the furnace shell. The induction coils and heating elements are each arranged in three sets, evenly distributed along the length of the furnace shell. The shielding rings are arranged in four sets, interleaved with the three sets of induction coils. The induction coils are sleeved on the outer surface of the corresponding heating element, with a gap fit between the opposite ends of adjacent heating elements. Multiple heat insulation plates are detachably mounted on the carrier. The carrier is configured as a rectangular frame structure to support long and short rods entering the furnace shell. Three sets of temperature measuring components are provided, each set positioned between the furnace shell and the corresponding heating element, monitoring the temperature of the corresponding heating element.

[0008] The structure of the medium-frequency induction heating furnace includes two heating modes. In the long rod heating mode, the power applied to the induction coils at both ends is higher than that of the middle coil, realizing first-level heating compensation. The wall thickness of the front and rear heating elements decreases sequentially from their outer ends to their inner ends, while the wall thickness of the middle heating element remains unchanged, realizing second-level heating compensation. Both ends of the long rod are blocked by corresponding heat insulation plates to prevent the heat from the ends of the long rod from diffusing to the outer ends, realizing third-level heating compensation, so as to make the axial temperature of the long rod material uniformly distributed.

[0009] In the short rod heating mode, each short rod is isolated inside the corresponding heating element by a heat insulation plate to achieve independent heating.

[0010] According to an advantageous embodiment, an insulation layer is provided on the inner wall of the furnace shell.

[0011] According to an advantageous embodiment, the inner wall of the shielding ring and the corresponding heating element are jointly fixedly connected by a plurality of circumferentially distributed supports.

[0012] According to an advantageous embodiment, a plurality of connecting pipes are provided above the furnace shell, the connecting pipes being used to connect to an external vacuum pump and a protective gas source, respectively.

[0013] According to an advantageous embodiment, the carrier includes two symmetrically distributed support rods, with connecting blocks fixedly installed at both ends of the support rods. Two adjacent left and right connecting blocks are movably inserted into each other on opposite sides. The insertion section of the I-shaped plug has multiple locking holes along its length. A first limiting pin is inserted into the upper side of the connecting block and is movably inserted into the corresponding locking hole. A support foot with pulleys is fixedly installed on the lower side of the I-shaped plug.

[0014] According to an advantageous embodiment, each of the three heating elements has a support rail fixedly installed on its lower inner wall, and the pulleys on the support feet are sequentially connected to the corresponding support rails in a rolling manner.

[0015] According to an advantageous embodiment, the heat insulation plate includes an upper partition and a lower partition. The upper partition and the lower partition each have two symmetrically distributed arc-shaped clearance grooves on opposite sides. Each of the two arc-shaped clearance grooves on the lower side of the upper partition is provided with a positioning block. The upper side of the bearing rod has a plurality of evenly distributed insertion holes that are adapted to the positioning blocks along its length. An insertion plate is fixedly provided in the middle of the upper side of the lower partition. A slot is provided in the middle of the lower side of the upper partition. The insertion plate is inserted into the corresponding slot and locked by the second limiting pin at the corresponding position of the upper partition.

[0016] According to an advantageous embodiment, the temperature measuring component includes a temperature measuring tube disposed on the furnace shell, the lower end of the temperature measuring tube movably penetrating the furnace shell and inserting into the outer wall of the corresponding heating element, and a temperature measuring probe disposed at the upper end of the temperature measuring tube, the temperature measuring probe being connected to a temperature measuring main controller fixedly disposed on the upper side of the furnace shell via a wire.

[0017] Compared with existing technologies, the medium-frequency induction heating furnace structure provided by this invention has the following beneficial effects: 1. In this invention, the traditional integral heating element is replaced with a multi-segment heating element that is evenly distributed along the length of the furnace shell. Each segment of the heating element is independently controlled by an independent induction coil and a shielding ring. Combined with the flexible arrangement of detachable heat insulation plates on the carrier, an efficient switching mechanism between "long rod mode" and "short rod mode" is constructed within the same device. This structure can achieve axial temperature uniformity through the synergistic heating of multiple heating elements in long rod mode, and can achieve independent, efficient, and damage-free heating of single or multiple short rods by selectively activating one or more heating elements and using heat insulation plates for physical isolation in short rod mode. This overcomes the triple technical challenges of existing long-furnace heating furnaces: "large axial temperature difference of long rods, high energy consumption and easy adhesion of short rods, and difficulty in switching production modes."

[0018] 2. In this invention, during the heating of the long rod, the induction coils at both ends apply a higher power than the middle coil to achieve primary compensation. Then, the wall thickness of the heating elements decreases sequentially from the outer end to the inner end to actively enhance end heating, achieving secondary compensation. Finally, the heat insulation plates installed at both ends of the carrier prevent heat from the ends from diffusing into the furnace shell, achieving tertiary compensation. The synergistic effect of these three levels of compensation significantly reduces the axial temperature difference of the long rod, preventing the tungsten-molybdenum rod from cracking due to thermal stress.

[0019] 3. In this invention, a heat insulation plate is detachably installed on the carrier. When heating a single short rod, only a small section of the corresponding heating element is activated, while the remaining sections remain at a low temperature or are turned off. Simultaneously, the heat insulation plate physically isolates the heating cavity inside that section from adjacent sections, ensuring the short rod is completely within the effective radiation zone. This structure significantly reduces the energy consumption for heating the short rod and significantly improves axial temperature uniformity. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of the present invention;

[0021] Figure 2 This is a side-view cross-sectional perspective three-dimensional structural schematic diagram of the present invention;

[0022] Figure 3 This is a schematic diagram showing the state of the short bar during heating in this invention;

[0023] Figure 4 This is a schematic diagram showing the state of the long bar during heating in this invention;

[0024] Figure 5 This is a schematic diagram of the external three-dimensional structure of the carrier and the long bar in this invention;

[0025] Figure 6 This is a partial three-dimensional structural diagram of the vehicle in this invention;

[0026] Figure 7 This is a schematic diagram of the external three-dimensional structure of the heat insulation board in this invention.

[0027] The attached figures are labeled as follows: 1. Furnace shell; 2. Induction coil; 3. Shielding ring; 4. Heating element; 5. Carrier; 51. Bearing rod; 52. Connecting block; 53. I-shaped insert; 54. First limiting pin; 55. Support foot; 6. Insulation plate; 61. Upper partition; 62. Lower partition; 63. Positioning block; 64. Insert plate; 65. Second limiting pin; 7. Temperature measuring component; 71. Temperature measuring tube; 72. Temperature measuring probe; 8. Insulation layer; 9. Connecting pipe; 100. Long bar; 200. Short bar. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 - Appendix Figure 7 This application will be described in further detail.

[0029] Please refer to the following: Figures 1-4 A medium-frequency induction heating furnace structure is disclosed for heating tungsten and molybdenum rods. The furnace structure includes a furnace shell 1 with a hatch, and an insulation layer 8 is provided on the inner wall of the furnace shell 1. The insulation layer 8 has a multi-layer structure with a thickness of 150 mm, consisting of a graphite felt layer (approximately 50 mm thick), a molybdenum screen layer (approximately 10 mm thick, multi-layered), and a ceramic fiber board layer (approximately 90 mm thick) from the inside out. This structure can reduce heat loss and improve thermal efficiency.

[0030] The insulation layer 8 contains three sets of induction coils 2 and three sets of heating elements 4, all evenly distributed along the length of the furnace shell 1. Additionally, the insulation layer 8 contains four sets of shielding rings 3, staggered with the three sets of induction coils 2, to isolate magnetic field coupling and prevent inter-segment interference. The two ends of each heating element 4 are respectively positioned within a corresponding shielding ring 3, and the two are fixedly connected by supports made of alumina ceramic or silicon nitride material. Induction coils 2 are fitted onto the outer surface of their respective heating elements 4. The three sets of induction coils 2 correspond one-to-one with the three sets of heating elements 4, with a gap fitting between the opposite ends of adjacent heating elements 4. The furnace shell 1 also contains a movable carrier 5 that can move in and out of it. The carrier 5 has a rectangular frame structure and is equipped with multiple detachable heat insulation plates 6. A temperature measuring component 7 is installed between the furnace shell 1 and the corresponding heating element 4.

[0031] In the long rod heating mode: the long rod 100 is supported by the carrier 5, and heat insulation plates 6 are installed at both ends of the carrier 5. The two heat insulation plates 6 and the corresponding ends of the long rod 100 maintain an axial gap of 2-5mm to prevent the long rod 100 from contacting and squeezing with the heat insulation plates 6 when it expands at high temperature. The temperature of each independent heating element 4 is monitored by the temperature measuring component 7.

[0032] First, the three induction coils 2 operate independently, with the power applied to the two end induction coils 2 being higher than that of the middle coil, thus achieving first-level heating compensation. In this embodiment, the power of the two end coils is set to 1.2-1.5 times that of the middle coil.

[0033] Then, the wall thickness of the front heating element 4 and the rear heating element 4 decreases sequentially from their outer ends (near the furnace door or tail end) to their inner ends (near the middle heating element 4), for example, the outer wall thickness is 5mm and the inner wall thickness is 12mm, showing a linear gradual change. The wall thickness of the middle heating element 4 is a uniform 12mm. Under the condition of the same power input to the induction coil 2, the thinner-walled front and rear heating elements 4 have higher resistance and higher heating power per unit volume, so their heating rate is faster than that of the middle heating element 4. This actively compensates for the radiative heat loss from both ends to the water-cooled furnace door, achieving two-stage heating compensation.

[0034] Finally, both ends of the long rod are blocked by corresponding heat insulation plates 6 to prevent heat from diffusing outward from the ends of the long rod, thus achieving three-stage heating compensation. Through the synergistic effect of the above three-stage heating compensation, the axial temperature distribution of the long rod 100 is uniform, and the measured temperature difference can be controlled within ±5℃.

[0035] In short bar heating mode: When heating a single short bar 200, the operator can select any one of the three sets of heating elements 4 according to the specifications of the short bar 200. The short bar 200 is placed on the carrier 5 at the position corresponding to the selected heating element 4, and heat insulation plates 6 are installed at both ends of the short bar 200. Then, the carrier 5 is pushed into the furnace shell 1, so that the short bar 200 is located inside the selected heating element 4. Through the isolation effect of the heat insulation plates 6, the short bar 200 is heated only within the corresponding heating element 4 section, while the other heating element 4 sections can be kept at a low temperature or turned off. This ensures that the short bar 200 is heated fully and evenly, while solving the problem of energy waste caused by the need to heat the entire long heating element 4 to the process temperature when heating a single short bar 200 in a traditional long bar 100 heating furnace.

[0036] When heating three short bars 200 in batches, all three bars 200 are supported by the same carrier 5 and spaced apart. An axial gap of 10-20mm is maintained between the end faces of adjacent bars 200. They are then fed together into the furnace shell 1 into the corresponding heating element 4. The ends of adjacent bars 200 do not contact each other, and they are isolated by a heat insulation plate 6 to prevent mutual interference of heat radiation. This solves the problems of easy end-to-end adhesion, arcing, and high product scrap rate during batch heating of short bars 200, enabling batch and high-quality heating of short bars 200. Furthermore, the temperature of each short bar 200 can be independently controlled by its corresponding induction coil 2 to meet different process temperature requirements.

[0037] See Figures 2-4 Multiple connecting pipes 9 are installed above the furnace shell 1, which are used to connect to an external vacuum pump and a protective gas source (such as argon or hydrogen). After the workpiece is loaded, the furnace shell 1 is sealed. The vacuum pump evacuates the inside of the furnace shell 1 through the connecting pipes 9 to a predetermined vacuum level (e.g., better than 10). -2 Then, the furnace is refilled with protective gas to a slightly positive pressure (e.g., +10 to +50 mm water column). This "furnace cleaning" operation is usually repeated 2-3 times to completely replace the air in the furnace and reduce the oxygen content to below 10 ppm. Subsequently, protective gas is continuously introduced to maintain positive pressure in the furnace and ensure that the tungsten-molybdenum rods are not oxidized during heating.

[0038] See Figure 3 , Figure 5 and Figure 6The carrier 5 includes two symmetrically distributed support rods 51. Connecting blocks 52 are fixedly installed at both ends of the support rods 51. I-shaped inserts 53 are movably inserted into the opposite sides of two adjacent connecting blocks 52. Multiple locking holes are formed along the length of the insertion section of the I-shaped insert 53. A first limiting pin 54 is inserted into the upper side of the connecting block 52, and the first limiting pin 54 is movably inserted into the corresponding locking hole. A support foot 55 with pulleys is fixedly installed on the lower side of the I-shaped insert 53. Support rails are fixedly installed on the lower inner walls of the three heating elements 4. The pulleys on the support feet 55 are sequentially and tumbled onto the corresponding support rails. The entire carrier 5 slides along the length of the furnace shell 1 via the support feet 55 and pulleys, moving the rods to the designated position within the heating element 4.

[0039] A support area is formed between the two support rods 51. Since the diameter of the rod is designed to always be greater than the minimum distance between the two support rods 51, the rod is supported by the upper edges of the support rods 51. Therefore, reducing the distance between the two support rods 51 can raise the center height of the rod, thereby adjusting the alignment accuracy between the central axis of the rod and the central axis of the heating element 4. The distance between the left and right support rods 51 is adjustable: by changing the depth of the I-shaped insert 53 inserted into the left and right connecting blocks 52, and then locking it with the first limiting pin 54, the distance between the two support rods 51 can be adjusted to accommodate rods of different diameters.

[0040] See Figures 5-7 To accommodate the heating requirements of both long and short rods, the heat insulation plate 6 includes an upper partition 61 and a lower partition 62. The upper partition 61 and the lower partition 62 each have two symmetrically distributed arc-shaped clearance grooves on opposite sides. The two arc-shaped clearance grooves on the lower side of the upper partition 61 each have a positioning block 63. The upper side of the bearing rod 51 has multiple evenly distributed insertion holes that are compatible with the positioning blocks 63 along its length. An insertion plate 64 is fixedly installed in the middle of the upper side of the lower partition 62. A slot is opened in the middle of the lower side of the upper partition 61. The insertion plate 64 is inserted into the corresponding slot and locked by the second limiting pin 65 at the corresponding position of the upper partition 61.

[0041] The positioning block 63 on the upper partition 61 is inserted into the corresponding insertion hole on the upper surface of the bearing rod 51. Then, the insertion plate 64 on the lower partition 62 is aligned with the slot on the lower side of the upper partition 61 and inserted. The installation of the heat insulation plate 6 relative to the carrier 5 is completed by locking it with the second limiting pin 65. The heat insulation plate 6 can be installed in different positions on the carrier 5 to meet the heat insulation requirements when the carrier 5 carries long or short rods.

[0042] It should be noted that the heat insulation plate 6 can be installed at different positions on the carrier 5 (by selecting different insertion holes) to meet the heat insulation requirements when heating long or short rods. When it is necessary to adjust the spacing between the two support rods 51, since the positions of the insertion holes will move relative to each other, this embodiment uses multiple sets of heat insulation plates 6 of different widths. The positioning block 63 of each set of heat insulation plates 6 is matched with the spacing of the corresponding support rod 51 to ensure that the heat insulation plate 6 can be installed smoothly.

[0043] See Figure 2 and Figure 3 The temperature measuring component 7 includes a temperature measuring tube 71 mounted on the furnace shell 1. The lower end of the temperature measuring tube 71 extends through the furnace shell 1 and is inserted into a blind hole (the bottom of the blind hole is approximately 2-5 mm from the inner wall of the heating element 4) on the outer wall of the corresponding heating element 4. A temperature measuring probe 72, preferably a dual-color infrared temperature measuring probe 72, is mounted on the upper end of the temperature measuring tube 71. The temperature measuring probe 72 is connected via a wire to a temperature measuring main controller fixedly mounted on the upper side of the furnace shell 1. The temperature of the corresponding heating element 4 is detected in real time by the temperature measuring probe 72. The temperature measuring main controller sends the temperature signal to the PLC controller. The PLC dynamically adjusts the input power of the corresponding induction coil 2 based on the deviation between the actual temperature and the target temperature of each section of the heating element 4 to ensure the uniformity of the heating of the rod.

[0044] In summary, the medium-frequency induction heating furnace structure provided by the present invention, through the synergistic effect of the segmented independently controlled induction coil 2, the heating element 4, the detachable heat insulation plate 6, and the multi-level heating compensation strategy, has the following beneficial effects: 1. In the long rod heating mode, through the three-level compensation of "unequal power distribution + heating element 4 with gradually varying wall thickness + end heat insulation plate 6", the problem of uneven axial temperature is effectively solved, and the temperature difference can be controlled within ±5℃, thereby avoiding the risk of cracking of tungsten molybdenum rods due to thermal stress.

[0045] 2. In the short rod heating mode, the internal heating cavity of the heating element 4 is physically separated by the heat insulation plate 6, which realizes independent, efficient and damage-free heating of single or multiple short rods 200, avoiding end adhesion and arcing.

[0046] 3. With the detachable heat insulation plate 6 and the same carrier 5, it can quickly switch between long rod and short rod modes, making the equipment highly flexible.

[0047] Those skilled in the art will readily understand that the specific values ​​in the above embodiments (such as the insulation layer 8 thickness of 150mm, wall thickness of 5mm / 12mm, and gap of 2-5mm, etc.) are merely examples and not intended to limit the invention. In practical applications, adjustments can be made appropriately based on the furnace size, heating temperature, and rod specifications. For example, for heating tungsten rods with operating temperatures as high as 2000℃, the heating element 4 can be made of isostatic graphite, with the wall thickness gradually varying from 8mm at the outer end to 15mm at the inner end; for heating molybdenum rods, the heating element 4 can be made of molybdenum alloy, with the wall thickness gradually varying accordingly. These modifications do not exceed the protection scope of the present invention.

[0048] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A structure for a medium-frequency induction heating furnace, characterized in that: Includes the furnace shell and the induction coil, shielding ring, heating element, carrier, heat insulation plate and temperature measuring components installed inside the furnace shell; The induction coil and heating element are each provided in three sets and are evenly distributed along the length of the furnace shell. The shielding ring is provided in four sets and is staggered with the three sets of induction coils. The induction coil is sleeved on the outer surface of the corresponding heating element, and the opposite ends of two adjacent heating elements are fitted with a gap. Multiple heat insulation panels are provided and detachably mounted on the vehicle; The carrier is configured as a rectangular frame structure to support long and short bars as they enter the furnace shell. The temperature measuring components are provided in three sets, with each set of temperature measuring components positioned between the furnace shell and the corresponding heating element, and the temperature of the corresponding heating element is monitored through the temperature measuring components; The structure of the medium-frequency induction heating furnace includes two heating modes. In the long rod heating mode, the power applied to the induction coils at both ends is higher than that of the middle coil, which is a first-level heating compensation. The wall thickness of the front and rear heating elements decreases from the outer end to the inner end, while the wall thickness of the middle heating element remains unchanged, which is a second-level heating compensation. Both ends of the long rod are blocked by corresponding heat insulation plates to prevent the heat from the ends of the long rod from diffusing to the outer end, which is a third-level heating compensation, so as to make the axial temperature of the long rod uniformly distributed. In the short rod heating mode, each short rod is isolated inside the corresponding heating element by a heat insulation plate for independent heating.

2. The structure of a medium-frequency induction heating furnace according to claim 1, characterized in that, The inner wall of the furnace shell is provided with a heat insulation layer.

3. The structure of a medium-frequency induction heating furnace according to claim 1, characterized in that, The inner wall of the shielding ring and the corresponding heating element are fixedly connected by multiple supports distributed in a circumferential direction.

4. The structure of a medium-frequency induction heating furnace according to claim 1, characterized in that, Multiple connecting pipes are provided above the furnace shell, which are used to connect to an external vacuum pump and a protective gas source, respectively.

5. The structure of a medium-frequency induction heating furnace according to claim 1, characterized in that, The carrier includes two symmetrically distributed support rods. Connecting blocks are fixedly installed at both ends of the support rods. I-shaped plugs are movably inserted into the opposite sides of two adjacent left and right connecting blocks. Multiple locking holes are opened along the length of the insertion section of the I-shaped plug. A first limiting pin is inserted into the upper side of the connecting block and is movably inserted into the corresponding locking hole. A support foot with pulley is fixedly installed on the lower side of the I-shaped plug.

6. The structure of a medium-frequency induction heating furnace according to claim 5, characterized in that, Each of the three heating elements has a fixed support rail on its lower inner wall, and the pulleys on the support feet are sequentially connected to the corresponding support rails in a rolling manner.

7. The structure of a medium-frequency induction heating furnace according to claim 5, characterized in that, The heat insulation board includes an upper partition and a lower partition. The upper partition and the lower partition each have two symmetrically distributed arc-shaped clearance grooves on opposite sides. The two arc-shaped clearance grooves on the lower side of the upper partition each have a positioning block. The upper side of the bearing rod has multiple evenly distributed insertion holes that are adapted to the positioning blocks along its length. An insertion plate is fixedly installed in the middle of the upper side of the lower partition. A slot is opened in the middle of the lower side of the upper partition. The insertion plate is inserted into the corresponding slot and locked by the second limiting pin at the corresponding position of the upper partition.

8. The structure of a medium-frequency induction heating furnace according to claim 1, characterized in that, The temperature measuring component includes a temperature measuring tube installed on the furnace shell. The lower end of the temperature measuring tube movably penetrates the furnace shell and is inserted into the outer wall of the corresponding heating element. A temperature measuring probe is installed at the upper end of the temperature measuring tube. The temperature measuring probe is connected to a temperature measuring main controller fixedly installed on the upper side of the furnace shell via a wire.

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