Electric induction furnace

Abstract

The invention discloses an electric induction furnace which comprises a support fixedly arranged at the front end of a furnace platform; the furnace body is arranged in the furnace platform, and the front end of the furnace body is hinged to the support through a first rotating shaft; the smoke hood comprises a smoke collecting hood, a first air duct and a second air duct, and the smoke hood is arranged on the furnace body and corresponds to the smoke outlet of the furnace body; the first air duct and the second air duct are arranged on the side face of the smoke hood, the first end of the first air duct communicates with the smoke collecting hood and can rotate relatively, the second end of the first air duct communicates with the first end of the second air duct and is in sliding insertion fit with the first end of the second air duct, and a smoke outlet is formed in the side face of the second air duct; the connecting seat is hinged to the second end of the second air duct through a second rotating shaft, the second rotating shaft is located above the first rotating shaft and is parallel to the first rotating shaft, and the connecting seat is fixedly arranged above the coil base. The technical effects that a flue mounting opening does not need to be additionally formed in the coil base, only the connecting base is mounted on the upper surface of the coil base, and the connecting base serves as a connecting structure of the smoke hood on the coil base are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of induction furnaces, and more particularly to an induction electric furnace. Background Art

[0002] The working frequency of an intermediate frequency induction electric furnace (hereinafter referred to as an intermediate frequency furnace) is between 50 and 2000 Hz, and it is widely used for the melting of non-ferrous metals and ferrous metals. Compared with other casting equipment, the intermediate frequency induction electric furnace has the advantages of high thermal efficiency, short melting time, less alloy element burning loss, wide range of melting materials, small environmental pollution, and accurate control of the temperature and composition of molten metal.

[0003] In the related art, as Figure 1 shown, the intermediate frequency induction electric furnace includes a furnace body 2, the furnace body 2 is installed on a furnace platform 1, the front end of the furnace body 2 is on a bracket 11 through a rotating shaft, and the molten metal after melting can be poured by rotating the furnace body. To process flue gas, a smoke hood 3 is installed on the furnace body, and a flue duct installation opening coaxial with the rotating shaft needs to be provided on the furnace platform as the installation structure of the smoke hood 3. The smoke outlet of the smoke hood 3 is installed in the flue duct installation opening, and during the rotation of the furnace body 2 around the rotating shaft, the entire smoke hood 3 rotates around the axis of the flue duct installation opening.

[0004] Obviously, additionally opening a flue duct installation opening on the furnace platform affects the integrity of the furnace platform, and it is difficult to additionally install a smoke hood for an induction furnace without a smoke hood. Summary of the Invention

[0005] The main object of the present invention is to provide an induction electric furnace to solve the problems in the related art that additionally opening a flue duct installation opening on the furnace platform affects the integrity of the furnace platform, and it is difficult to additionally install a smoke hood for an induction furnace without a smoke hood.

[0006] To achieve the above object, the present invention provides an induction electric furnace, including:

[0007] A bracket, the bracket is fixedly provided at the front end of the furnace platform;

[0008] A furnace body, the furnace body is arranged in the furnace platform, the front end of the furnace body is hinged to the bracket through a first rotating shaft, so that the furnace body can be flipped relative to the bracket;

[0009] A smoke hood, the smoke hood includes a smoke collecting hood, a first air duct and a second air duct, the smoke hood is arranged on the furnace body and corresponds to the smoke outlet of the furnace body;

[0010] Both the first air duct and the second air duct are arranged on the side surface of the smoke hood, the first end of the first air duct is communicated with the smoke collecting hood and can rotate relatively, the second end of the first air duct is communicated with the first end of the second air duct and is in sliding plug-in fit, and a smoke outlet is arranged on the side surface of the second air duct;

[0011] The connecting seat, the connecting seat is hinged to the second end of the second air duct through a second rotating shaft, the second rotating shaft is located above the first rotating shaft and parallel to the first rotating shaft, and the connecting seat is fixedly arranged at the upper end of the furnace table.

[0012] Further, an opening structure is arranged at the second end of the first air duct, and the first end of the second air duct is slidably inserted into the first air duct through the opening structure.

[0013] Further, the second rotating shaft is located directly above the first rotating shaft, and the second rotating shaft is close to the first rotating shaft.

[0014] Further, a circular first interface is arranged at the first end of the first air duct, a circular second interface is arranged at one end of the side surface of the smoke collecting hood away from the first rotating shaft, and the first interface and the second interface are hinged and communicated through a plain bearing.

[0015] Further, a first limiting member and a second limiting member are arranged on the first air duct, the first limiting member is arranged on the left and right sides of the first air duct, and the second limiting member is arranged on the upper and lower sides of the first air duct;

[0016] Both the first limiting member and the second limiting member are in contact with the outer side surface of the second air duct to limit the position of the second air duct in the first direction and the second direction, and the first direction, the second direction and the sliding and telescopic direction of the second air duct are perpendicular to each other.

[0017] Further, both the first limiting member and the second limiting member are arranged in two groups and arranged along the sliding and telescopic direction of the second air duct.

[0018] Further, the first limiting member includes a first bearing seat and a first limiting shaft, the first bearing seat is arranged on the upper and lower side surfaces of the first air duct, the upper and lower ends of the first limiting shaft are respectively hinged to the first bearing seats at both ends, and the inner side of the first limiting shaft is in contact with the outer side of the second air duct;

[0019] The second limiting member includes a second bearing seat and a second limiting shaft, the second bearing seat is arranged on the left and right side surfaces of the first air duct, the left and right ends of the second limiting shaft are respectively hinged to the second bearing seats on both sides, and the inner side of the second limiting shaft is in contact with the outer side of the second air duct.

[0020] Further, both the first limiting shaft and the second limiting shaft include a coaxial large-diameter section and a small-diameter section, the large-diameter section is arranged in two sections and located at both ends of the small-diameter section, the inner side of the large-diameter section is in contact with the outer side of the second air duct, and there is a gap between the inner side of the small-diameter section and the outer side of the second air duct.

[0021] Further, arc-shaped openings are formed on the two side walls of the first end of the second air duct opposite to the first interface, and the diameter of the arc-shaped openings is greater than or equal to the diameter of the first interface.

[0022] Further, a sealing strip is arranged on the inner side of the first end of the first air duct, and the sealing strip is sleeved on the second air duct;

[0023] Two reinforcing frames are arranged on the inner side of the first air duct, and the two reinforcing frames are respectively close to the two groups of first limiting members.

[0024] In the embodiment of the present invention, by providing a bracket fixedly arranged at the front end of the furnace platform; a furnace body arranged in the furnace platform, the front end of the furnace body is hinged to the bracket through a first rotating shaft so that the furnace body can rotate relative to the bracket; a smoke hood including a smoke collecting hood, a first air duct and a second air duct, the smoke hood is arranged on the furnace body and corresponds to the smoke outlet of the furnace body; the first air duct and the second air duct are both arranged on the side surface of the smoke hood, the first end of the first air duct is communicated with the smoke collecting hood and can rotate relatively, the second end of the first air duct is communicated with the first end of the second air duct and is in sliding plug-in fit, and a smoke outlet is arranged on the side surface of the second air duct; a connecting seat, the connecting seat is hinged to the second end of the second air duct through a second rotating shaft, the second rotating shaft is located above the first rotating shaft and parallel to the first rotating shaft, the connecting seat is fixedly arranged at the upper end of the furnace platform. On the one hand, the connecting seat installed on the upper end surface of the furnace platform is used as the connection structure of the smoke hood on the furnace platform. At this time, in order to enable the whole smoke hood to rotate with the furnace body, the first air duct and the second air duct in the smoke hood are set as telescopic structures, and the first end of the first air duct and the smoke collecting hood can rotate relatively, and the second air duct and the connecting seat can rotate relatively. During the outward rotation of the furnace body, the first air duct slides on the second air duct along the direction towards the second rotating shaft, and during the inward rotation of the furnace body, the first air duct slides on the second air duct along the direction away from the second rotating shaft, so as to achieve the purpose that no additional flue installation opening needs to be opened on the furnace platform, and only the connecting seat can be installed on the upper surface of the furnace platform, and the connecting seat is used as the connection structure of the smoke hood on the furnace platform, thereby solving the problem that the additional flue installation opening on the furnace platform in the related technology affects the integrity of the furnace platform; on the other hand, since there is no need to carry out destructive transformation on the furnace platform to install the smoke hood, it is also convenient and fast to install the smoke hood for an induction furnace without a smoke hood. Description of the Drawings

[0025] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, making other features, objects and advantages of the present invention more obvious. The schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0026] Figure 1 is a schematic structural diagram of an induction furnace in the related technology;

[0027] Figure 2 is a schematic structural diagram of an induction furnace according to an embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram of the induction furnace after rotation according to an embodiment of the present invention;

[0029] Figure 4a is Figure 2 a schematic structural diagram with the first air duct hidden;

[0030] Figure 4b is a schematic structural diagram of the first limiting shaft;

[0031] Figure 5 is a schematic cross-sectional structural diagram of the connection between the first air duct and the second air duct according to an embodiment of the present invention;

[0032] Wherein, 1 furnace body, 2 furnace platform, 3 smoke hood, 30 smoke collecting hood, 300 second interface, 31 first air duct, 310 first interface, 32 second air duct, 320 smoke outlet, 321 arc-shaped opening, 4 first limiting member, 40 first bearing seat, 41 first limiting shaft, 410 small diameter section, 411 large diameter section, 5 second limiting member, 50 second bearing seat, 51 second limiting shaft, 6 connecting seat, 7 sealing strip, 8 strengthening frame, 9 first rotating shaft, 10 second rotating shaft, 11 support. Detailed implementation manners

[0033] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to describe the embodiments of the present invention here.

[0035] In the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0036] Moreover, in addition to being used to indicate orientation or positional relationship, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0037] In addition, terms such as "arranged", "provided with", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the meaning of the term "plurality" should be two or more.

[0039] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0040] To solve the related technical problems, as Figures 2 to 5 shown, an induction furnace is provided in an embodiment of the present invention, including:

[0041] A bracket 11, the bracket 11 is fixed at the front end of the furnace platform 2;

[0042] A furnace body 1, the furnace body 1 is arranged in the furnace platform 2, and the front end of the furnace body 1 is hinged to the bracket 11 through a first rotating shaft 9, so that the furnace body 1 can be flipped relative to the bracket 11;

[0043] A smoke hood 3, the smoke hood 3 includes a smoke collecting hood 30, a first air duct 31 and a second air duct 32, the smoke hood 3 is arranged on the furnace body 1 and corresponds to the smoke outlet 320 of the furnace body 1;

[0044] Both the first air duct 31 and the second air duct 32 are arranged on the side of the smoke hood 3. The first end of the first air duct 31 is communicated with the smoke collecting hood 30 and can rotate relatively. The second end of the first air duct 31 is communicated with the first end of the second air duct 32 and is in sliding plug-in fit. An air outlet 320 is arranged on the side of the second air duct 32;

[0045] A connecting seat 6, the connecting seat 6 is hinged to the second end of the second air duct 32 through a second rotating shaft 10. The second rotating shaft 10 is located above the first rotating shaft 9 and is parallel to the first rotating shaft 9. The connecting seat 6 is fixed at the upper end of the furnace platform 2.

[0046] In this embodiment, the induction furnace mainly includes a furnace body 1 and a support 11. The furnace body 1 is installed inside a furnace platform 2, and the support 11 is installed at the front end of the furnace platform 2. The furnace platform 2 can be a foundation structure made of concrete casting, and has a space inside that can accommodate the furnace body 1. The melting process of the metal mainly takes place inside the furnace body 1. The upper end of the front side of the furnace body 1 is hinged to the support 11 through a first rotating shaft 9, so that the furnace body 1 can rotate around the first rotating shaft 9 to pour out the molten metal inside the furnace body 1. The rotation of the furnace body 1 can be driven by a hydraulic rod or a motor, and this is not limited in this embodiment. An opening is provided at the upper end of the furnace body 1, through which the required materials can be put in and the molten metal can be discharged during pouring.

[0047] For the convenience of flue gas treatment, a smoke hood 3 is provided on the furnace body 1 in this embodiment. During the metal melting process, the flue gas discharged from the opening of the furnace body 1 is collected by the smoke hood 3 and enters the flue gas treatment equipment through the corresponding flue. In one implementation, the smoke hood 3 can be connected to a cyclone device to draw the flue gas to flow through wind force. Since a part of the smoke hood 3 needs to be connected to the upper end face of the furnace body 1, and in order to avoid opening a mounting opening for the smoke hood 3 on the furnace platform 2 to install the smoke hood 3, a connecting seat 6 is arranged on the upper end face of the furnace platform 2 as the connecting structure of the smoke hood 3 on the furnace platform 2 in this embodiment. Since there is a dislocation between the upper end face of the furnace platform 2 and the first rotating shaft 9, if the smoke hood 3 is simply connected to the connecting seat 6, the smoke hood 3 will be stuck during the rotation of the furnace body 1 around the first rotating shaft 9, that is, the smoke hood 3 cannot rotate synchronously with the furnace body 1.

[0048] Therefore, in this embodiment, the smoke hood 3 mainly includes a smoke collecting hood 30, a first air duct 31 and a second air duct 32. Among them, the smoke collecting hood 30 is installed on the upper end face of the furnace body 1 and corresponds to the opening on the furnace body 1. The smoke collecting hood 30 can be set in various structural forms, but generally it is a structure that can cover the opening of the furnace body 1. The specific structure of the smoke collecting hood 30 is not limited in this embodiment. The first air duct 31 and the second air duct 32 are both arranged on the side of the smoke collecting hood 30. As Figure 2 shown, in one implementation, both the first air duct 31 and the second air duct 32 are arranged on the right side of the smoke collecting hood 30. To enable the furnace body 1 and the smoke hood 3 to rotate smoothly, in this embodiment, the first end of the first air duct 31 is set to be relatively rotatable with respect to the smoke collecting hood 30, and the second end of the first air duct 31 is communicated with the first end of the second air duct 32 and is in sliding plug-in fit, that is, the first air duct 31 and the second air duct 32 can be telescopic. The second end of the second air duct 32 is then hinged to the connecting seat 6 through a second rotating shaft 10. The second rotating shaft 10 is a rotating shaft that is in the same direction as and parallel to the first rotating shaft 9. The external flue gas treatment equipment can be connected to the smoke outlet 320 of the second air duct 32. After the smoke outlet 320 is connected to the external flue gas treatment equipment, the connection relationship between the smoke outlet 320 and the connected pipeline is a hinged connection relationship.

[0049] As Figure 2 andFigure 3 As shown, after arranging the smoke hood 3, when the furnace body 1 rotates counterclockwise outward around the first rotating shaft 9, the smoke collecting hood 30 installed on the furnace body 1 rotates synchronously with the furnace body 1. During this process, the first end of the first air duct 31 rotates at a certain angle relative to the smoke collecting hood 30, and the second end of the first air duct 31 will slide linearly on the second air duct 32 in the direction towards the second rotating shaft 10. At the same time, the first air duct 31 and the second air duct 32 will rotate counterclockwise around the second rotating shaft 10. Similarly, when the furnace body 1 rotates clockwise inward around the first rotating shaft 9, the smoke collecting hood 30 installed on the furnace body 1 rotates synchronously with the furnace body 1. During this process, the first end of the first air duct 31 rotates at a certain angle relative to the smoke collecting hood 30, and the second end of the first air duct 31 will slide linearly on the second air duct 32 in the direction away from the second rotating shaft 10. At the same time, the first air duct 31 and the second air duct 32 will rotate clockwise around the second rotating shaft 10.

[0050] It can be seen that through the structural improvement of the first air duct 31 and the second air duct 32 on the smoke hood 3, the improvement of the connection relationship between the first air duct 31 and the smoke collecting hood 30, and the improvement of the connection relationship between the second air duct 32 and the connection seat 6 in the present invention, when a part of the smoke hood 3 is installed on the furnace body 1 and a part of the smoke hood 3 is installed on the furnace platform 2 through the connection seat 6, the smoke hood 3 can also rotate around the first rotating shaft 9 with the furnace body 1. Since there is no need to open a flue installation opening on the furnace platform 2, there is no need to perform destructive adjustment on the furnace platform 2, which ensures the integrity of the furnace platform 2. In addition, for the furnace platform 2 without the smoke hood 3 arranged, it is also possible to complete the installation of the smoke hood 3 without damaging the furnace platform 2.

[0051] As Figure 5 shown, in a connection method of the first air duct 31 and the second air duct 32, an opening structure is provided at the second end of the first air duct 31, and the first end of the second air duct 32 is slidably inserted into the first air duct 31 through the opening structure.

[0052] Since the first rotating shaft 9 and the second rotating shaft 10 are not coaxial and the second rotating shaft 10 is located above the first rotating shaft 9, in order to reduce the telescopic amount between the first air duct 31 and the second air duct 32 during rotation, the second rotating shaft 10 should be close to the first rotating shaft 9. In the present invention, it is preferably that the second rotating shaft 10 is located directly above the first rotating shaft 9 and the second rotating shaft 10 is close to the first rotating shaft 9 under the condition of meeting the installation requirements.

[0053] The friction between the first air duct 31 and the second air duct 32 can be sliding friction or rolling friction. When it is sliding friction, the inner side surface of the first air duct 31 is attached to the outer side surface of the second air duct 32, and the first air duct 31 and the second air duct 32 can be made of aluminum bronze or tin bronze plates with relatively good wear resistance. When it is rolling friction, a pedestal bearing capable of self-aligning can be arranged between the first air duct 31 and the second air duct 32. In order to prevent flue gas from leaking out, a high-temperature resistant silica gel sealing strip 7 is used for sealing between the first air duct 31 and the second air duct 32, and the maximum temperature resistance can reach 300 degrees.

[0054] Since the first end of the first air duct 31 needs to be connected to the smoke collecting hood 30 and can rotate relative to it, as Figure 4a and Figure 5 shown, in this embodiment, a circular first interface 310 is provided at the first end of the first air duct 31. The first interface 310 is located inside the first air duct 31. A circular second interface 300 is provided at one end of the side surface of the smoke collecting hood 30 away from the first rotating shaft 9. The second interface 300 is located outside the smoke collecting hood 30. The first interface 310 and the second interface 300 are hinged and connected through a plain bearing.

[0055] Since relative sliding can occur between the first air duct 31 and the second air duct 32, when the contact area between the first air duct 31 and the second air duct 32 is too large, it is easy to get stuck during use. For this reason, as Figure 5 shown, in the present invention, the second air duct 32 is suspended inside the first air duct 31, that is, the peripheral side surfaces of the second air duct 32 do not contact the peripheral side surfaces of the second air duct 32.

[0056] To achieve the above effects, as Figure 2 and Figure 4a shown, in this embodiment, a first limiting member 4 and a second limiting member 5 are provided on the first air duct 31. The first limiting member 4 is arranged on the left and right sides of the first air duct 31, and the second limiting member 5 is arranged on the upper and lower sides of the first air duct 31;

[0057] Both the first limiting member 4 and the second limiting member 5 are attached to the outer side surface of the second air duct 32 to limit the position of the second air duct 32 in the first direction and the second direction. The first direction, the second direction and the sliding and telescopic direction of the second air duct 32 are perpendicular to each other.

[0058] Specifically, the first limiting member 4 and the second limiting member 5 in this embodiment are structures surrounding the second air duct 32. The first limiting member 4 and the second limiting member 5 jointly play a role in supporting and limiting the second air duct 32. In this embodiment, through the arrangement of the first limiting member 4 and the second limiting member 5, the peripheral sides of the second air duct 32 do not directly contact the first air duct 31. During the telescopic process, the second air duct 32 slides relative to the first limiting member 4 and the second limiting member 5, thereby reducing the friction generated during the telescopic process.

[0059] For the first limiting member 4 and the second limiting member 5, both the first limiting member 4 and the second limiting member 5 can be a shaft or a wheel that can rotate about a fixed axis, etc. In this embodiment, no limitation is imposed on them here.

[0060] As Figure 1 shown, to better support the second air duct 32, in this embodiment, both the first limiting member 4 and the second limiting member 5 are provided in two groups and arranged along the sliding and telescopic direction of the second air duct 32. Specifically, in this embodiment, the first limiting member 4 is provided with four, divided into two groups and distributed front and back. The second limiting member 5 is also provided with four, divided into two groups and distributed up and down.

[0061] In one implementation manner of the first limiting member 4 and the second limiting member 5, as Figure 4a shown, the first limiting member 4 includes a first bearing seat 40 and a first limiting shaft 41. The first bearing seat 40 is provided on the upper side and the lower side of the first air duct 31. The upper and lower ends of the first limiting shaft 41 are respectively hinged to the first bearing seats 40 at both ends. The inner side of the first limiting shaft 41 is in contact with the outer side of the second air duct 32;

[0062] The second limiting member 5 includes a second bearing seat 50 and a second limiting shaft 51. The second bearing seat 50 is provided on the left side and the right side of the first air duct 31. The left and right ends of the second limiting shaft 51 are respectively hinged to the second bearing seats 50 on both sides. The inner side of the second limiting shaft 51 is in contact with the outer side of the second air duct 32.

[0063] Specifically, in this embodiment, the first limiting shaft 41 can rotate about a fixed axis on the first bearing seat 40 and contact the left and right outer sides of the second air duct 32, while the second limiting shaft 51 can rotate about a fixed axis on the second bearing seat 50 and contact the upper and lower outer sides of the second air duct 32. During the process of the second air duct 32 sliding relative to the first air duct 31, the first limiting shaft 41 and the second limiting shaft 51 rotate a certain amount, making the second air duct 32 in rolling friction while supporting the second air duct 32, reducing the frictional force and making the telescopic process smoother.

[0064] On the basis of the above implementation manner, to further prevent the second air duct 32 from expanding after being heated and causing unsmooth sliding, in this embodiment, the structures of the first limiting shaft 41 and the second limiting shaft 51 are further adjusted. Specifically, as Figure 4a and Figure 4b shown, in this embodiment, both the first limiting shaft 41 and the second limiting shaft 51 include coaxial large-diameter segments 411 and small-diameter segments 410. The large-diameter segments 411 are provided in two sections and located at both ends of the small-diameter segment 410. The inner sides of the large-diameter segments 411 are in contact with the outer side of the second air duct 32, and there is a gap between the inner side of the small-diameter segment 410 and the outer side of the second air duct 32.

[0065] It should be noted that during processing, the middle regions of the first limiting shaft 41 and the second limiting shaft 51 can be processed to reduce the diameter of the middle regions, thereby dividing the first limiting shaft 41 and the second limiting shaft 51 into two large-diameter segments 411 and one small-diameter segment 410. During the relative sliding of the second air duct 32, the small-diameter segment 410 never contacts the surface of the second air duct 32, and only the large-diameter segments 411 at both ends contact the second air duct 32, thereby reducing the contact area between the second air duct 32 and the limiting shaft, and further enabling smooth sliding even after the second air duct 32 expands due to heat.

[0066] On the basis of the above-described embodiment, in order to improve the sealing performance, further, as Figure 5 shown, a sealing strip 7 is provided inside the first end of the first air duct 31. The sealing strip 7 is sleeved on the second air duct 32, and the sealing strip 7 can be located at a position on the first air duct 31 close to the opening structure. After arranging the first limiting member 4 and the second limiting member 5, in order to improve the structural strength of the corresponding region between the first air duct 31 and the limiting member and avoid deformation. Two reinforcing frames 8 are provided inside the first air duct 31, and the two reinforcing frames 8 are respectively close to the two groups of first limiting members 4. It can be understood that the two reinforcing frames 8 can be located inside or outside the first limiting member 4, and in this embodiment, they are preferably located outside the first limiting member 4.

[0067] As Figure 4a shown, in order to have sufficient expansion and contraction amount between the first air duct 31 and the second air duct 32 without affecting the ventilation volume, in this embodiment, arc-shaped openings 321 are provided on the two side walls of the first end of the second air duct 32 opposite to the first interface 310, and the diameter of the arc-shaped openings 321 is greater than or equal to the diameter of the first interface 310.

[0068] It can be understood that when the lengths of the first air duct 31 and the second air duct 32 are fixed, in order to increase the expansion and contraction amount, the second air duct 32 should be close to the first interface 310 of the first air duct 31. In order not to affect the ventilation volume, the second air duct 32 should not block the first interface 310. Therefore, in this embodiment, arc-shaped openings 321 are provided on the two side walls of the first end of the second air duct 32 opposite to the first interface 310, and the diameter of the arc-shaped openings 321 is greater than or equal to the diameter of the first interface 310. After providing the arc-shaped openings 321, the first end of the second air duct 32 can be closer to the first interface 310 and does not block the first interface 310, thereby ensuring the ventilation volume while having sufficient expansion and contraction amount.

[0069] To further strengthen the structure, a reinforcing rib is provided inside the second end of the second air duct 32.

[0070] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An induction furnace, characterized in that, Comprising: A bracket fixedly provided at the front end of the furnace platform; A furnace body disposed within the furnace platform, with the front end of the furnace body hinged to the bracket through a first rotating shaft, enabling the furnace body to flip relative to the bracket; A smoke hood, which includes a smoke collecting hood, a first air duct, and a second air duct, and is disposed on the furnace body corresponding to the smoke outlet of the furnace body; Both the first air duct and the second air duct are disposed on the side of the smoke hood. The first end of the first air duct communicates with the smoke collecting hood and is rotatable relative to it. The second end of the first air duct communicates with the first end of the second air duct and is in sliding plug-in fit. An air outlet is provided on the side of the second air duct; A connecting seat, with the second end of the second air duct hinged to the connecting seat through a second rotating shaft. The second rotating shaft is located above the first rotating shaft and parallel to it, and the connecting seat is fixedly provided at the upper end of the furnace platform.

2. The induction furnace according to claim 1, characterized in that, The second end of the first air duct is provided with an opening structure, and the first end of the second air duct is slidably plugged into the first air duct through the opening structure.

3. The induction furnace according to claim 1, characterized in that, The second rotating shaft is located directly above the first rotating shaft and close to the first rotating shaft.

4. The induction furnace according to claim 1, characterized in that, The first end of the first air duct is provided with a circular first interface, and one end of the side of the smoke collecting hood away from the first rotating shaft is provided with a circular second interface. The first interface and the second interface are hinged and communicated through a plain bearing.

5. The induction furnace according to claim 1, wherein The first air duct is provided with a first limiting member and a second limiting member. The first limiting member is disposed on the left and right sides of the first air duct, and the second limiting member is disposed on the upper and lower sides of the first air duct; Both the first limiting member and the second limiting member are in contact with the outer side surface of the second air duct to limit the position of the second air duct in the first direction and the second direction. The first direction, the second direction, and the sliding and telescopic direction of the second air duct are perpendicular to each other.

6. The induction furnace according to claim 5, wherein Both the first limiting member and the second limiting member are provided in two groups and arranged along the sliding and telescopic direction of the second air duct.

7. The induction furnace according to claim 6, characterized in that, The first limiting member includes a first bearing seat and a first limiting shaft. The first bearing seat is disposed on the upper and lower side surfaces of the first air duct, and the upper and lower ends of the first limiting shaft are respectively hinged to the first bearing seats at both ends. The inner side of the first limiting shaft is in contact with the outer side of the second air duct; The second limiting member includes a second bearing seat and a second limiting shaft. The second bearing seat is disposed on the left and right side surfaces of the first air duct, and the left and right ends of the second limiting shaft are respectively hinged to the second bearing seats on both sides. The inner side of the second limiting shaft is in contact with the outer side of the second air duct.

8. The induction furnace according to claim 7, characterized in that, Both the first limiting shaft and the second limiting shaft include coaxial large-diameter segments and small-diameter segments. The large-diameter segments are provided in two sections and located at both ends of the small-diameter segment. The inner side of the large-diameter segment is in contact with the outer side of the second air duct, and there is a gap between the inner side of the small-diameter segment and the outer side of the second air duct.

9. The induction furnace according to claim 4, wherein The first end of the second air duct is provided with arc-shaped openings on the side walls opposite to the first interface. The diameter of the arc-shaped openings is greater than or equal to the diameter of the first interface.

10. The induction furnace according to claim 5, characterized in that, A sealing strip is arranged on the inner side of the first end of the first air duct, and the sealing strip is sleeved on the second air duct; Two reinforcing frames are arranged on the inner side of the first air duct, and the two reinforcing frames are respectively close to the two groups of first limiting members.

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