Channel-type induction heating tundish

Abstract

The application discloses a channel type induction heating tundish, which comprises a tundish shell, an induction heater and a protection cylinder, the tundish shell is divided into a pouring area and a pouring area and is communicated through a molten steel channel, the induction heater is arranged around the molten steel channel, the tundish shell comprises a tundish bottom and a tundish wall, the tundish bottom and the tundish wall are combined to form a cavity, the tundish bottom is provided with a mounting hole, the protection cylinder passes through the mounting hole and is fixedly connected with the tundish bottom, a first partition groove is formed in the tundish shell, the first partition groove penetrates from the mounting hole to the outer edge of the tundish wall, a second partition groove is vertically formed in the side of the protection cylinder and penetrates through, insulating pads are embedded in the first partition groove and the second partition groove, and the second partition groove is correspondingly installed with the first partition groove to form a U-shaped partition structure, so that the eddy current heat generated by the induction heating is inhibited, the eddy current loop is effectively blocked, the size of the eddy current is inhibited, and the eddy current heat of the tundish shell and the protection cylinder is significantly reduced.

Description

Technical Field

[0001] This invention relates to the field of intermediate ladle induction heating technology, specifically to a channel-type induction heating intermediate ladle. Background Technology

[0002] The superheat of molten steel in the tundish is one of the key process parameters for ensuring continuous casting output and billet quality. Low-superheat isothermal casting not only increases casting speed, reduces leakage accidents, and improves the internal and external quality of the billet, but also lowers tapping temperature and increases furnace lining life. To reduce the superheat of molten steel in the tundish, various heating methods are currently used, including chemical heating, plasma heating, electromagnetic induction heating, electric arc heating, electroslag heating, and ceramic resistance heating. Among these, the most widely used is the tundish channel induction heating method.

[0003] The working principle of tundish channel-type electromagnetic induction heating is based on the principle of electromagnetic induction. When a medium-frequency current is fed into the coil of the induction heater, the alternating current establishes a main magnetic flux in the closed magnetic circuit of the heater core. This alternating magnetic flux induces an electromotive force in the molten steel flowing through the channel. Since the molten steel flowing through the channel is conductive, an induced current is formed within it. This induced current generates Joule heat in the molten steel, thus achieving the effect of heat preservation and heating of the molten steel. Therefore, according to the principle of tundish induction heating, an electromotive force is induced in all conductive metals connected to the core, forming an induced current. This includes not only the molten steel but also other conductive metal components or structural parts connected to the core, such as the tundish shell, inductor protection cylinder, and air ducts. Eddy current heating in structural components reduces working strength and thus affects equipment safety. Therefore, in practical engineering applications, tundish induction heating technology requires, on the one hand, increasing heating power to rapidly heat the molten steel, and on the other hand, suppressing eddy current heating in the tundish shell, protection cylinder, and air ducts to ensure structural strength and safe operation of the equipment. In addition, since the induction heating coil is placed in the middle of high-temperature molten steel, ensuring the safe operation of the high-power induction heating coil is also a prerequisite for ensuring the safe operation of the tundish induction heating technology.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a channel-type induction heating tundish. By establishing a unified and continuous isolation insulation structure on the tundish shell and protective cylinder, the eddy current loop is effectively blocked, and the reactive heating phenomenon of the tundish shell and protective cylinder is suppressed. Independent air-cooling and water-cooling systems are built on the induction heater to dissipate heat and cool the induction heater in real time, which can better improve the safety of the tundish shell and protective cylinder structure.

[0006] To achieve the above objectives, the present invention provides a channel-type induction heating tundish, comprising a tundish shell, an induction heater, and a protective cylinder. The inner side of the tundish shell is lined with a refractory layer. The tundish shell is divided into a flow-in zone and a casting zone, which are connected via a molten steel channel. The induction heater is arranged around the molten steel channel. The tundish shell includes a bottom and a wall, which together form a cavity. The bottom has a mounting hole, and the protective cylinder passes through the mounting hole and is fixedly connected to the bottom. A first partition groove is formed on the tundish shell, extending from the mounting hole to the outer edge of the wall. A second partition groove is vertically formed on the side of the protective cylinder. Insulating pads are embedded in both the first and second partition grooves. The second partition groove and the first partition groove are installed correspondingly to form a U-shaped partition structure to suppress eddy current heating generated by induction heating.

[0007] Furthermore, a first flange is provided on both sides of the first partition groove, and the corresponding first flanges on both sides are fixedly connected by insulating bolts. A bottom flange is provided on the outer edge of the mounting hole. The bottom, wall and protective cylinder are all made of stainless steel or non-magnetic manganese steel.

[0008] Furthermore, a connection transition area is provided at the junction of the mounting hole and the first partition groove, and the connection transition area has a rounded corner structure.

[0009] Furthermore, the protective cylinder includes a cylinder body and a protective cylinder flange, the second partition groove is vertically formed on the cylinder body, the protective cylinder flange is disposed at the first end of the cylinder body, and the protective cylinder flange has an opening corresponding to the second partition groove.

[0010] Furthermore, second flanges are provided on both sides of the second partition groove, and the corresponding second flanges on both sides are fixedly connected by insulating bolts.

[0011] Furthermore, the induction heater includes a first side iron core, a second side iron core, a horizontal iron core, a lower iron core, and a ventilation hood. The first side iron core and the second side iron core are respectively fixedly connected to the two ends of the horizontal iron core to form an upper iron core with a door frame structure. The lower iron core is fixedly combined with the open end of the upper iron core with the door frame structure to form an induction heater with a closed magnetic circuit. The ventilation hood is sleeved on the horizontal iron core. A coil is wound and installed on the first side iron core. The first side iron core is installed inside the protective cylinder. An air inlet is provided at the first end of the ventilation hood. The second end of the ventilation hood is snapped and connected to the upper end of the protective cylinder to form a through-flow cooling channel from the ventilation hood to the protective cylinder. The coil is a hollow copper tube to connect with cooling water to achieve water cooling.

[0012] Furthermore, the first side core is cylindrical or near-cylindrical.

[0013] Furthermore, a semi-circular snap-fit ​​groove is provided at the upper end of the protective cylinder, and a semi-circular snap-fit ​​connector is provided at the second end of the ventilation hood. The snap-fit ​​groove and the snap-fit ​​connector are snapped together, and a ventilation hole is provided on the side of the snap-fit ​​connector near the inner cavity of the protective cylinder.

[0014] Furthermore, a water inlet and a water outlet are provided on one side of the ventilation hood, and the water inlet and the water outlet are respectively connected to the two ends of the coil.

[0015] Furthermore, the width of both the first partition groove and the second partition groove is 10~30mm. The above-described solution of the present invention has the following beneficial effects: The channel-type induction heating intermediate tundish provided by this invention forms a U-shaped partition structure by opening partition grooves on the intermediate tundish shell and the protective cylinder respectively, and embedding insulating pads in the partition grooves for insulation treatment. This not only effectively blocks the eddy current loop, but also suppresses the magnitude of the eddy current, which can significantly reduce the eddy current heating of the intermediate tundish shell and the protective cylinder. It can effectively avoid the structural strength reduction caused by overheating of the protective cylinder and the intermediate tundish shell during induction heating, and also reduce the reactive power heating power, and improve the induction heating efficiency of the intermediate tundish.

[0016] The channel-type induction heating intermediate tundish provided by the present invention cools the heating coil simultaneously by establishing an independent air-cooling system and a water-cooling system on the induction heater. This efficiently removes a large amount of Joule heat generated in the coil during heating by the induction heater, preventing the heating coil from overheating and affecting production safety. At the same time, the air-cooling system is established between the coil and the protective cylinder, which can cool the protective cylinder at the same time, improve the structural strength of the protective cylinder, and ensure the coil and production safety. The cylindrical or near-cylindrical design of the coil core in this induction heater offers the following unique advantages: ① The solenoid coil wound around the cylindrical core has no bends, maximizing space utilization and allowing for increased turns and magnetic core area, thus increasing the induced magnetic flux in the closed core; ② It helps reduce the size of the inductor, minimizing space occupied in the tundish and reducing or even eliminating the original steel load capacity, which is particularly important for adding channel-type induction heaters to existing tundishes; ③ The pressure loss and residence time of the cooling medium in the coil are significantly reduced, improving cooling efficiency and reducing the capacity and volume of the cooling system; ④ The absence of bends minimizes insulation damage, improving insulation level and service life; ⑤ It greatly reduces the difficulty of coil manufacturing, improving manufacturing quality, efficiency, and reducing costs; ⑥ It helps reduce maintenance workload in steel mills.

[0017] Other beneficial effects of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the intermediate heating pack of the present invention; Figure 2 for Figure 1 Sectional view along line AA; Figure 3 This is a schematic diagram of the installation of the intermediate tundish housing and the induction heater of the present invention; Figure 4 This is a schematic diagram of the intermediate cassette shell structure of the present invention; Figure 5 This is a bottom view of the intermediate package shell of the present invention; Figure 6 This is a schematic diagram of the overall structure of the protective cylinder of the present invention; Figure 7 This is a schematic diagram of the overall structure of the induction heater of the present invention (without the protective cylinder). Figure 8 This is a side view of the induction heater of the present invention (with protective cylinder). Figure 9 This is a schematic diagram of the lower iron core installation according to the present invention; Figure 10 This is a schematic diagram of the vortex distribution in the protective cylinder, where... Figure 10 'a' represents the eddy current distribution of the protective cylinder without slotted insulation. Figure 10 b represents the eddy current distribution of the protective cylinder with slotted insulation treatment according to the present invention; Figure 11 This is a schematic diagram of the vortex distribution in the tundish shell, where... Figure 11 'a' represents the eddy current distribution in the uninsulated eddy current isolation shell of the tundish. Figure 11b represents the eddy current distribution of the intermediate package shell in the insulating eddy current isolation treatment of the present invention.

[0019] [Explanation of Labels in the Attached Image] 1-Intermediate ladle shell; 101-Mounting hole; 102-Ladle wall; 103-Ladle bottom; 104-First partition groove; 105-Connecting transition area; 106-Support seat; 107-Firming plate assembly; 108-First flange; 109-Ladle bottom flange; 2-Induction heater; 21-First side core; 22-Second side core; 23-Horizontal core; 24-Lower core; 3-Protective cylinder; 31-Cylinder body; 32-Second partition groove; 33-Second flange; 34-Protective cylinder flange; 35-Snap-fit ​​groove; 4-Refractory layer; 5-Molten steel channel; 6-Injection zone; 7-Pouring zone; 8-Insulating pad; 9-Ventilation hood; 91-Air inlet; 92-Water inlet; 93-Water outlet; 94-Snap-fit ​​connector; 10-Coil; 11-Mounting seat; 111-Reinforcing rib; 12-Molten steel. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The various specific technical features and embodiments described in the specific embodiments can be combined in any suitable manner without contradiction. For example, different combinations of specific technical features / embodiments can form different implementation methods. To avoid unnecessary repetition, the various possible combinations of various specific technical features / embodiments in this invention will not be described separately.

[0021] It should be noted that the terms "set" and "connect" should be interpreted broadly. For example, they can refer to direct setting, installation, or connection, or indirect setting or connection through central components or structural parts. Furthermore, the orientations or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" in this invention are based on the orientations or positional relationships shown in the accompanying drawings or in conventional placement or usage states. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the structures, features, devices, or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0022] Example 1

[0023] like Figures 1-9As shown, this embodiment provides a channel-type induction heating tundish, including a tundish shell 1, an induction heater 2, and a protective cylinder 3. A refractory layer 4 is built inside the tundish shell 1 to prevent molten steel 12 from directly contacting the tundish shell 1. The tundish shell 1 is divided into a flow-in zone 6 and a casting zone 7, which are connected by a molten steel channel 5. The induction heater 2 is arranged around the molten steel channel 5. Specifically, in this embodiment, the tundish shell 1 is divided into the flow-in zone 6 and the casting zone 7 by refractory material. Two sets of molten steel channels 5 are symmetrically arranged in a "V" shape. Correspondingly, the induction heaters 2 are also symmetrically arranged around the two molten steel channels 5, also in a "V" shape.

[0024] In this embodiment, the tundish shell 1 includes a bottom 103 and a wall 102. The wall 102 is arranged around the bottom 103, and the bottom 103 and the wall 102 together form a cavity. A refractory layer 4 is installed inside the cavity, and the refractory layer 4 is used to directly contain molten steel 12. A mounting hole 101 is provided on the bottom 103. A protective cylinder 3 passes through the mounting hole 101 and is fixedly connected to the bottom 103. The coil 10 of the induction heater 2 is installed inside the protective cylinder 3, and the protective cylinder 3 provides good protection for the coil of the induction heater 1.

[0025] Furthermore, a first partition groove 104 is provided on the intermediate liner shell 1. The first partition groove 104 extends from the mounting hole 105 to the outer edge of the liner wall 102, that is, the first partition groove 104 connects the mounting hole 105 and the outer edge of the liner wall 102, forming an "L"-shaped partition structure on the intermediate liner shell 1. The protective cylinder 3 includes a cylinder body 31 and a protective cylinder flange 34. A vertically penetrating second partition groove 32 parallel to the axial direction of the cylinder body 31 is provided on the cylinder body 31. Insulating pads 8 are embedded in both the first partition groove 104 and the second partition groove 32. In this embodiment, the insulating pad 8 is preferably a ceramic pad. After the protective cylinder 3 is installed into the mounting hole 101, the first partition groove 104 and the second partition groove 32 will form a U-shaped partition structure. When the induction heater 2 is installed in the protective cylinder 3 for heating, the U-shaped partition can effectively suppress the eddy current heating phenomenon generated by induction heating by blocking and insulating the eddy current, significantly reducing the eddy current heating of the protective cylinder 3 and the intermediate tundish shell 1, thereby reducing the temperature, increasing the strength, and playing a good protective role for the heating structure of the intermediate tundish.

[0026] A bottom flange 109 is provided on the outer side of the bottom 103 at the outer edge of the mounting hole 101. The protective cylinder flange 34 is located at one end of the cylinder body 31. When the protective cylinder 3 is installed, it passes through the mounting hole 101 and is connected to the bottom flange 109 and the protective cylinder flange 34 by bolts. An insulating pad 8 (not shown in the figure) can also be installed at the connection between the bottom flange 109 and the protective cylinder flange 34 to further ensure the insulation between the protective cylinder 3 and the intermediate casing 1. An opening corresponding to the second partition groove 32 is provided on the protective cylinder flange 34 to prevent the protective cylinder flange 34 from connecting the lower end of the protective cylinder 3 and to better block eddy current heating.

[0027] Furthermore, first flanges 108 are provided on both sides of the first partition groove 104, and the corresponding first flanges 108 on both sides are fixedly connected by insulating bolts; correspondingly, second flanges 33 are provided on both sides of the second partition groove 32, and the corresponding second flanges 33 on both sides are fixedly connected by insulating bolts. The groove width of the first partition groove 104 and the second partition groove 32 is 10~30mm, preferably 20mm in this embodiment. Insulating gaskets 8 are embedded at the connection between the first flange 108 and the second flange 33, which not only plays a better role in insulation, but also ensures the structural strength of the intermediate cassette shell 1 and the protective cylinder 3 after the groove is cut.

[0028] In this embodiment, the bottom 103, the wall 102, and the protective cylinder 3 are all made of non-magnetic, low-conductivity, and high-temperature resistant metal materials, such as stainless steel or non-magnetic manganese steel. Non-magnetic manganese steel is preferred in this embodiment. A transition zone 105 is provided at the junction of the mounting hole 101 and the first partition groove 104. The transition zone 105 has a rounded corner structure, preferably with a radius of 60-100mm, which can effectively reduce the accumulation of heat generated by eddy currents after partitioning in the transition zone 105 between the mounting hole 101 and the first partition groove 104. A support base 106 is provided at the bottom of the bottom 103, and a stiffening plate assembly 107 is sleeved inside the support base 106. The stiffening plate assembly 107 can improve the structural strength of the bottom 103 and stably support the molten metal to be heated.

[0029] In this embodiment, the induction heater 2 includes a first side iron core 21, a second side iron core 22, a horizontal iron core 23, and a lower iron core 24. The first side iron core 22 and the second side iron core 23 are respectively fixedly connected to the upper iron core of the horizontal iron core 23 to form a door-frame structure. The lower iron core 24 is fixedly combined with the open end of the upper iron core of the door-frame structure to form a magnetically closed induction heater. A coil 10 is wound and installed on the first side iron core 21. When the coil 10 is connected to an alternating power supply, the induction heater 2 forms a closed alternating magnetic field. The molten steel 12, located in the alternating magnetic field, induces an alternating current, thus heating the molten steel 12. The induction heater 2 also includes a ventilation hood 9, which is fitted onto the horizontal iron core 23. The first side iron core 21 is installed inside a protective cylinder 3, which protects the coil 10 installed on the first side iron core 21. The first end of the ventilation hood 9 is provided with an air inlet 91, and the second end of the ventilation hood 9 is snapped into and connected to the upper end of the protective cylinder 3 to form a through-flow cooling channel from the ventilation hood 9 to the protective cylinder 3. The first side iron core 21 and coil 10 are installed inside the protective cylinder 3. Specifically, a semi-circular snap-fit ​​groove 35 is provided at the upper end of the protective cylinder 3. The semi-circular snap-fit ​​groove 35 can be obtained by cutting 1 / 5 to 4 / 1 of the total length downward along the axis at the upper end of the cylindrical hollow protective cylinder 3. The second end of the ventilation hood 9 is provided with a semi-circular snap-fit ​​connector 94 corresponding to the snap-fit ​​groove 35. The connection between the protective cylinder 3 and the ventilation hood 9 can be realized by snapping the snap-fit ​​groove 35 and the snap-fit ​​connector 94 into place. A ventilation hole is provided on the side of the snap-fit ​​connector 94 near the inner cavity of the protective cylinder 3. The air input into the ventilation hood 9 can be connected to the protective cylinder 3 through the ventilation hole to externally cool the coil 10 installed inside the protective cylinder 3. The coil 10 is a hollow copper tube. A water inlet 92 and a water outlet 93 are provided on one side of the ventilation hood 9. The water inlet 92 and the water outlet 93 are respectively connected to the two ends of the coil 10 in the hollow copper tube. The connection method can be to set copper tubes on the inner wall of the ventilation hood 10 to connect the water inlet and the water outlet respectively, or copper tubes can be built into the first iron core 21 and the horizontal iron core 23 to connect the water inlet and the water outlet. There is no specific limitation here. As long as the water inlet 92 and the water outlet 93 are connected to the coil 10 respectively, the low temperature cooling water is input through the water inlet 92 and flows through the coil 10 and then is discharged from the water outlet 93. The cooling water directly carries away the Joule heat generated by the coil 10 when it is energized, so as to prevent overheating.

[0030] In this embodiment, the first side core 21 is cylindrical or near-cylindrical. The coil 10 wound around this cylindrical or near-cylindrical core has no corners, thereby maximizing the space utilization of the coil 10. This facilitates increasing the number of turns of the coil 10 and increasing the magnetic conductive area of ​​the core, thereby increasing the induced magnetic flux in the closed core. The pressure loss of the cooling medium in the coil 10 is significantly reduced compared to conventional coils with corners, and the cooling medium flows faster, which is beneficial to improving the cooling effect of the coil 10 and also helps to reduce the capacity and volume of the cooling system.

[0031] Furthermore, the lower iron core 24 is detachably installed within the mounting base 11. Reinforcing ribs 111 are provided on both sides of the mounting base 11 to enhance its structural strength and ensure stable support for the lower iron core 24. Furthermore, a filter screen is installed inside the air inlet 91 to filter and purify the air entering the ventilation hood 91, preventing impurities from accumulating on the surface of the coil 10 and affecting heat dissipation. It also prevents larger conductive particles from being introduced, causing a short circuit in the coil 10 or grounding of the iron core, resulting in abnormal reactive heating.

[0032] When installing and using the tundish induction heater cooling device provided in this embodiment, the protective cylinder 3 is passed through the mounting hole 101 of the tundish housing 1 and fixed. The first side core 21 of the upper iron core of the portal frame structure is movably passed through the protective cylinder 3, the second side core 22 is fixedly installed on the outer edge of the tundish housing 1, and the lower iron core 24 is fixedly installed on the bottom of the tundish housing 1 through the mounting base 11. Before the coil 10 is energized, the fan is started to input cooling air through the air inlet 91. The cooling air passes through the protective cylinder 3 and is discharged from the bottom of the protective cylinder 3. At the same time, the water pump is started to input cooling water from the water inlet 92. After the cooling system is working normally, the coil 10 is energized for heating.

[0033] Example 2

[0034] Eddy current heating tests were performed on the protective cylinder and tundish shell with conventional insulation treatment without partition slots and with slotted insulation treatment as provided in this embodiment, respectively, and the results were as follows: Figures 10-11 The diagram shows the eddy current distribution, where, Figure 10 'a' represents the eddy current distribution of the protective cylinder without slotted insulation. Figure 10 b represents the eddy current distribution of the protective cylinder with slotted insulation treatment according to the present invention; Figure 11 'a' represents the eddy current distribution in the uninsulated eddy current isolation shell of the tundish. Figure 11 b represents the eddy current distribution of the intermediate cassette shell in the insulating eddy current isolation treatment of this invention. For example... Figure 10 a and Figure 11 As shown in Figure a, after the induction heater is energized, if the protective cylinder 3 and the tundish shell 1 are not subjected to eddy current insulation, large eddy current circulation will form within the protective cylinder and the tundish shell, resulting in significant eddy current heating and thus affecting their structural strength. Figure 10 As shown in b and b of 11, after adopting the eddy current blocking insulation treatment technology of the present invention, not only is the eddy current loop effectively blocked, but the eddy current size is also suppressed, effectively protecting the protective cylinder 3 and the intermediate tundish shell 1.

[0035] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A channel-type induction heating tundish, comprising a tundish shell (1), an induction heater (2), and a protective cylinder (3), wherein the inner side of the tundish shell (1) is lined with a refractory layer (4), the tundish shell (1) is divided into a flow injection zone (6) and a casting zone (7), the flow injection zone (6) and the casting zone (7) are connected by a molten steel channel (5), and the induction heater (2) is arranged around the molten steel channel (5), characterized in that, The intermediate packaging shell (1) includes a bottom (103) and a wall (102), which together form a cavity. The bottom (103) has a mounting hole (101), through which the protective cylinder (3) passes and is fixedly connected to the bottom (103). A first partition groove (104) is provided on the intermediate packaging shell (1), extending from the mounting hole (101) to the outer edge of the wall (102). The protective cylinder (3) has a through second partition groove (32) vertically opened on its side. Insulating pads (8) are embedded in both the first partition groove (104) and the second partition groove (32). The second partition groove (32) and the first partition groove (104) are installed to form a U-shaped partition structure to suppress eddy current heating generated by induction heating. A connection transition area (105) is provided at the connection between the mounting hole (101) and the first partition groove (104). The connection transition area (105) has a rounded corner structure.

2. The channel-type induction heating intermediate ladle according to claim 1, characterized in that, The first partition groove (104) is provided with a first flange (108) on both sides. The first flange (108) on both sides is fixedly connected by insulating bolts. The mounting hole (101) is provided with a bottom flange (109) on the outer edge. The bottom (103), the wall (102) and the protective cylinder (3) are all made of stainless steel or non-magnetic manganese steel.

3. The channel-type induction heating intermediate ladle according to claim 1, characterized in that, The protective cylinder (3) includes a cylinder body (31) and a protective cylinder flange (34). The second partition groove (32) is vertically opened on the cylinder body (31). The protective cylinder flange (34) is located at the first end of the cylinder body (31). The protective cylinder flange (34) has an opening corresponding to the second partition groove (32).

4. The channel-type induction heating intermediate ladle according to claim 2, characterized in that, The second partition groove (32) is provided with a second flange (33) on both sides, and the corresponding second flanges (33) on both sides are fixedly connected by insulating bolts.

5. The channel-type induction heating intermediate ladle according to claim 1, characterized in that, The induction heater (2) includes a first side iron core (21), a second side iron core (22), a horizontal iron core (23), a lower iron core (24), and a ventilation hood (9). The first side iron core (21) and the second side iron core (22) are respectively fixedly connected to the two ends of the horizontal iron core (23) to form an upper iron core with a door frame structure. The lower iron core (24) is fixedly combined with the open end of the upper iron core with the door frame structure to form an induction heater with a closed magnetic circuit. The ventilation hood (9) is sleeved on the horizontal iron core (23). A coil (10) is wound and installed on the first side iron core (21). The first side iron core (21) is installed inside the protective cylinder (3). An air inlet (91) is provided at the first end of the ventilation hood (9). The second end of the ventilation hood (9) is snapped and connected to the upper end of the protective cylinder (3) to form a through-flow cooling channel from the ventilation hood (9) to the protective cylinder (3). The coil (10) is a hollow copper tube to connect with cooling water to achieve water cooling.

6. The channel-type induction heating intermediate ladle according to claim 5, characterized in that, The first side core (21) is cylindrical or near-cylindrical.

7. The channel-type induction heating intermediate ladle according to claim 6, characterized in that, The upper end of the protective cylinder (3) is provided with a semi-circular snap-fit ​​groove (35), and the second end of the ventilation cover (9) is provided with a semi-circular snap-fit ​​connector (94). The snap-fit ​​groove (35) and the snap-fit ​​connector (94) are snapped together. The snap-fit ​​connector (94) is provided with a ventilation hole on the side of the inner cavity of the protective cylinder (3).

8. The channel-type induction heating intermediate ladle according to claim 6, characterized in that, The ventilation hood (9) has an inlet (92) and an outlet (93) on one side, and the inlet (92) and outlet (93) are respectively connected to the beginning and end of the coil (10).

9. The channel-type induction heating intermediate ladle according to claim 4, characterized in that, The width of the first partition groove (104) and the second partition groove (32) is 10~30mm.

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