Electromagnetic stirring device with bottom blowing function

Abstract

The electromagnetic stirring device comprises a furnace body, bases, a bridge frame and an electromagnetic stirring body, the two sides of the bottom of the furnace body are each provided with one base, each base comprises a W-shaped support and a cross beam, and the top end of the middle of each W-shaped support is hinged to the middle of the corresponding cross beam; the two ends of the beam are hinged to the first ends of the first hydraulic push rod and the second hydraulic push rod respectively, and the second ends of the beam are hinged to the bottoms of the W-shaped supports respectively. The cross beam is fixedly connected with a bridge frame, the bridge frame is fixedly connected with an electromagnetic stirring body so that the electromagnetic stirring body can abut against the bottom of the furnace body, the bottom of the furnace body is further communicated with an air hole so that gas can be introduced into the furnace body, and the electromagnetic stirring body and the air hole are staggered. According to the device, electromagnetic stirring force can be utilized to the maximum extent, electromagnetic stirring and bottom blowing can be conveniently combined at the bottom of the furnace body at the same time, the molten steel temperature uniformity and the impurity removal effect are improved through cooperation of bottom blowing and electromagnetic stirring, and the molten steel quality is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electromagnetic stirring technical field, concretely relates to a kind of electromagnetic stirring device of bottom blowing. BACKGROUND

[0002] To realize sustainable development, the steel industry is facing the major challenge of low-carbonization and green transformation, and it is urgent to improve the scrap utilization rate in the steelmaking process and optimize the stirring control effect of the furnace pool through technological progress.

[0003] Converter steelmaking and electric arc furnace steelmaking are the main steelmaking methods, with converter steelmaking mainly using blast furnace hot metal as raw material and electric arc furnace steelmaking mainly using scrap steel as raw material. In the metallurgical process, the furnace interior is often divided into charging area, molten steel area, etc. The placement of scrap steel and other materials in fixed areas can cause material accumulation in that area, reduce the temperature of the molten steel there, and make it difficult for the molten steel area to exchange heat with that area. The application of electromagnetic stirring technology to the above steelmaking methods can accelerate the melting speed of scrap steel, make the composition of molten steel solution more uniform, and improve the quality of molten steel by floating impurities. In the current way of smelting molten steel using a furnace, bottom blowing of oxygen or inert gas is often used to increase the temperature of the molten pool, promote dephosphorization and desulfurization, and reduce oxygen content, etc. Therefore, bottom blowing smelting is considered the most economical and environmentally friendly smelting process. However, the bottom blowing device is generally a bottom blowing pipe installed at the bottom of the furnace. Moreover, when the molten steel is poured out of the furnace, the space at the bottom is compressed, and it is difficult to combine electromagnetic stirring with bottom blowing.

[0004] Chinese patent publication No. CN118856925A discloses an electromagnetic stirring device for electric arc furnace and its stirring method. The device and scheme point out an electromagnetic stirring equipment placed at the bottom of the electric arc furnace, which rotates through a rotating base, and a system assembly including an electrical cabinet, a cooling device, and a control method. However, the stirring device considers changing the magnetic field direction through a rotating equipment as close as possible to the bottom surface of the electric arc furnace, ignoring the non-regular circular surface features of the electric arc furnace bottom, such as the bottom blowing port and the tapping port. Bottom blowing operation injects gas into the molten pool to enhance the stirring effect of molten metal, which has an important influence on the uniformity of the molten pool, temperature distribution, and melting rate of scrap steel. Moreover, the electric arc furnace needs to be tilted when tapping, so the rotatable electromagnetic stirring device has great limitations and risks in actual application.

[0005] In summary, there is an urgent need to develop an electromagnetic stirring device that can be applied to the bottom blowing features of converter steelmaking and electric arc furnace steelmaking, which can have compatibility with bottom blowing requirements in limited space and under normal operation of the equipment, and can improve the uniformity and quality of molten steel by stirring molten steel through electromagnetic stirring technology and accelerating the melting of scrap steel. At the same time, it needs to consider multiple effective stirring directions and equipment installation positions.

[0006] It should be noted that the above introduction of the technical background is only for the convenience of clearly and completely describing the technical scheme of the present application and facilitating the understanding of the skilled in the art. The above technical scheme cannot be considered as known to the skilled in the art only because it is described in the part of the background of the present application. Practical new type content

[0007] The utility model discloses a kind of electromagnetic stirring devices with bottom blowing, the device can take into account converter steelmaking and arc furnace steelmaking bottom blowing and electromagnetic stirring requirement, improve molten steel quality.

[0008] In order to achieve the above object, the utility model provides a kind of electromagnetic stirring devices with bottom blowing, including furnace body, pedestal, bridge and electromagnetic stirring body, the bottom of the furnace body two sides is respectively provided with a pedestal, the pedestal includes W type support and crossbeam, the middle top of the W type support is hinged with the middle of the crossbeam, the two ends of the crossbeam are respectively hinged with the first end of first hydraulic push rod and second hydraulic push rod, the second end of the first hydraulic push rod and second hydraulic push rod is respectively hinged with the bottom of the W type support, the bottom of the furnace body is respectively fixedly connected with the crossbeam;

[0009] The crossbeam is fixedly connected with the bridge, and the bridge is fixedly connected with the electromagnetic stirring body, so that the electromagnetic stirring body is in abutment with the bottom of the furnace body, and the bottom of the furnace body is also communicated with a gas hole to pass gas into the furnace body, and the electromagnetic stirring body is staggered with the gas hole.

[0010] Further, the two top ends of the W type support are respectively hinged with support seats, one side of the support seat is provided with a connecting seat, the first end of a secondary hydraulic push rod is hinged to the connecting seat, and the second end of the secondary hydraulic push rod is hinged to the bottom of the W type support.

[0011] Further, the electromagnetic stirring body includes a shell and a core, coils are wound on the core to form inductors, and a plurality of inductors are fixed in the shell in sequence by a screw rod.

[0012] Further, a through hole is formed in the core, the screw rod passes through the through hole, and the two ends of the screw rod are fixedly connected to the two sides of the shell.

[0013] Further, the curvature of the shell is consistent with the curvature of the bottom of the furnace body, and adjacent inductors are at a preset angle to correspond to the curvature of the shell.

[0014] Further, the iron core is stacked by silicon steel sheets, the winding direction of the coil is the stacking direction of the iron core, or the winding direction of the coil includes the stacking direction of the iron core and a direction perpendicular to the stacking direction of the iron core.

[0015] Further, the shell is provided with a mounting foot at one end away from the furnace body, and the mounting foot is fixedly connected with the bridge.

[0016] Further, the furnace body comprises a supporting plate and a shell bottom, the supporting plate is fixedly connected to the outer periphery of the shell bottom to form a cavity, the inner surface of the supporting plate is fixedly connected with a furnace wall, and the inner surface of the shell bottom is fixedly connected with a refractory layer, and the furnace wall and the refractory layer can resist the high temperature of molten steel.

[0017] Further, the shell bottom is provided with a ventilation hole, and the refractory layer is provided with a breathable brick at a position corresponding to the ventilation hole.

[0018] Further, the furnace wall is provided with a tapping hole on one side, and the tapping hole is located on the same side as the first hydraulic push rod or the second hydraulic push rod.

[0019] The above scheme of the utility model has the following beneficial effects:

[0020] The electromagnetic stirring device with bottom blowing provided by the utility model is used at the bottom of a converter or an electric arc furnace in a smelting site, and the electromagnetic stirring device is used to make molten steel flush a charging area to improve heat exchange rate, and the electromagnetic stirring effect on the molten steel area can improve the uniformity of the molten steel and improve the quality of the molten steel, and the efficiency of steel smelting can be improved and the cost can be reduced; the electromagnetic stirring device is fixed on the base beam, can be as close to the bottom of the furnace as possible, and can be tilted at the same angle as the furnace body, the mode can maximize the utilization of electromagnetic stirring force in combination with actual working conditions on site, and the electromagnetic stirring and bottom blowing can be combined at the bottom of the furnace body, the bottom blowing and the electromagnetic stirring are coordinated to improve the uniformity of molten steel temperature and the effect of removing impurities, and the quality of the molten steel is significantly improved.

[0021] In the utility model, a plurality of coil winding directions and a plurality of inductor combination modes are provided to obtain different stirring magnetic fields and different stirring effects, the actual steel smelting conditions can be adjusted or combined, and the adaptability is better.

[0022] Other beneficial effects of the utility model will be described in detail in the following specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a whole structure schematic view of the utility model;

[0024] Figure 2 It is a whole structure side view of the utility model.

[0025] Figure 3 It is an exploded view of the furnace body structure of the utility model;

[0026] Figure 4 It is a shell bottom structure schematic view of the utility model;

[0027] Figure 5 It is a furnace wall structure schematic view of the utility model;

[0028] Figure 6 It is a base structure schematic view of the utility model;

[0029] Figure 7 It is a bridge structure schematic view of the utility model;

[0030] Figure 8 It is an electromagnetic stirring body overall structure schematic view of the utility model;

[0031] Figure 9 It is an electromagnetic stirring body overall structure sectional view of the utility model;

[0032] Figure 10 It is a connecting component schematic view of the utility model;

[0033] Figure 11 It is an electromagnetic force direction schematic view of the utility model inductor different winding mode, wherein Figure 11 a and Figure 11 c are two different winding mode staggered arrangement, Figure 11 b and Figure 11 d are single winding mode respectively.

[0034]

Explanation of reference signs

[0035] 1-furnace body;11- supporting plate;12- furnace wall;121- tapping hole;13- refractory layer;14- shell bottom;141- air hole;2- base;21- W type support;22- crossbeam;23- first hydraulic push rod;24- second hydraulic push rod;25- support seat;251- connecting seat;26- auxiliary hydraulic push rod;3- bridge;4- electromagnetic stirring body;41- shell;42- iron core;43- coil;44- screw;45- mounting foot;46- connecting component;461- first support;462- second support. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model. In the specific implementation, each specific technical feature and each example described in the specific implementation can be combined in any appropriate manner without contradiction, for example, different specific technical features / examples can form different embodiments by combination. In order to avoid unnecessary repetition, each specific technical feature / example in the utility model will not be described again.

[0037] It should be noted that the terms "set", "connected" should be understood broadly, for example, it can be directly set, installed, connected, or indirectly set, connected through a centering component, a centering structure. In addition, the directions or position relationships of "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like in the utility model are based on the directions or position relationships shown in the drawings or the conventional placement state or use state, and are only for the convenience of describing the utility model and simplifying the description, and are not indicative or suggestive of the structures, features, devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, so it cannot be understood as a limitation on the utility model.

[0038] As Figures 1-11The utility model provides a kind of electromagnetic stirring device with bottom blowing, including furnace body 1, pedestal 2, bridge 3 and electromagnetic stirring body 4, the bottom both sides of furnace body 1 are provided with one pedestal 2 respectively. Among them, pedestal 1 includes W-type support 21 and crossbeam 22, the middle top of W-type support 21 is hinged with the middle of crossbeam 22, the both ends of crossbeam 22 are respectively hinged with the first end of first hydraulic push rod 23 and second hydraulic push rod 24, the second end of first hydraulic push rod 23 and second hydraulic push rod 24 is respectively hinged with the bottom of W-type support 21, the bottom both sides of furnace body 1 are fixedly connected with crossbeam 22. When needing to pour molten steel in furnace body 1, first hydraulic push rod 23 is raised or lowered, corresponding second hydraulic push rod 24 moves in the direction opposite to first hydraulic push rod 23, to drive crossbeam 22 and furnace body 1 to pour on one side, and the molten steel in furnace body 1 can be conveniently poured out. Further, the both sides top of W-type support 21 are respectively hinged with support seat 25, one side of support seat 25 is provided with connecting seat 251, the first end of auxiliary hydraulic push rod 26 is hinged on connecting seat 251, and the second end of auxiliary hydraulic push rod 26 is hinged with the bottom of W-type support 21. When needing to pour furnace body 1, auxiliary hydraulic push rod 26 drives support seat 25 to pour on one side, without interfering with crossbeam 22 pouring;When furnace body 1 maintains horizontal work, auxiliary hydraulic push rod 26 elongates and drives support seat 25 to be vertically located directly below the both ends of crossbeam 22, to play the role of auxiliary support crossbeam 22 and furnace body 1, to prevent furnace body 1 from accidentally pouring.

[0039] Further, crossbeam 22 is fixedly connected with bridge 3, and bridge 1 is fixedly connected with electromagnetic stirring body 4, so that electromagnetic stirring body 4 is in abutment with the bottom of furnace body 1, and electromagnetic stirring body 4 can effectively stir the molten steel in furnace 1. At the same time, the bottom of furnace body 1 is also communicated with air hole 141, and gas enters furnace body 1 through air hole 141, so as to improve the uniformity of molten steel temperature in furnace body 1, promote dephosphorization and desulfurization, reduce oxygen content, etc. Through the fixed support of bridge 3, whether furnace body 1 is poured or not, electromagnetic stirring body 4 is in close contact with the bottom of furnace body 1, and even when the molten steel in furnace body 1 is poured, electromagnetic stirring in furnace body 1 can be maintained, and electromagnetic stirring body 4 fixed at the bottom of furnace body 1 can be kept staggered with air hole 141, to avoid mutual interference.

[0040] Key reference Figures 8-10, the electromagnetic stirring body 4 includes a shell 41, a core 42, a coil 43 wound on the core 42 to form an inductor, and a plurality of inductors fixed in the shell 41 in sequence through a screw rod 44. The specific number of inductors can be selected according to the size of the furnace body 1, and will not be described here. Specifically, the core 42 is provided with a through hole, the screw rod 44 passes through the through hole, and the two ends of the screw rod 44 are fixedly connected to the two sides of the shell 44, so as to realize the fixation of the inductor in the shell 41. Further, the curvature of the shell 41 is consistent with the curvature of the bottom of the furnace body 1, so as to maximize the abutment of the electromagnetic stirring body 4 with the bottom of the furnace body 1, and the inductors adjacent to each other in the shell 41 are at a preset angle, so as to correspond to the curvature of the shell 41. At the same time, the end of the shell 41 away from the furnace body 1 is provided with a mounting foot 45, and the mounting foot 45 is fixedly connected with the bridge 3, so as to keep the electromagnetic stirring body 4 stably mounted on the bridge 3. In other embodiments, the inductors adjacent to each other can also be connected through a connecting component 46, and the connecting component 46 includes first and second supports 461 and 462 respectively arranged on the sides adjacent to each other of the inductors, the upper ends of the first and second supports 461 and 462 are hinged, a clamping groove is formed on the first support 461 away from the upper end, a supporting rod corresponding to the clamping groove is fixedly arranged on the second support 462, and a gasket is arranged in the clamping groove. By adjusting the thickness of the gasket, the included angle between the first and second supports 461 and 462 can be flexibly adjusted, and the included angle between the inductors adjacent to each other can also be quickly adjusted, so as to adapt to the curvature of the bottom of the different furnace bodies 1.

[0041] Key reference Figure 11 The core 42 is stacked by silicon steel sheets, the winding direction of the coil 43 on the core 42 is the stacking direction of the core 42, or the winding direction of the coil 43 includes the stacking direction of the core 42 and a direction perpendicular to the stacking direction of the core 42. The coil 43 is all arranged in one of the winding directions or staggered in the two winding directions, so as to provide a plurality of different inductor winding combinations, obtain different stirring magnetic fields and different stirring effects, and realize the following functions: 1) pushing the molten steel to flush the dropping area to perform high-efficiency heat exchange; 2) forming a small circulation in the molten steel area to optimize the molten steel quality in the molten steel area; and 3) forming a large circulation by using the furnace body structure to push the molten steel to circulate in the furnace body, and reducing the dead area caused by dropping.

[0042] Key reference Figures 3-5The furnace body 1 comprises a supporting plate 11, a shell bottom 14, the supporting plate 11 is fixedly connected to the outer periphery of the shell bottom 14 to form a cavity, the inner surface of the supporting plate 11 is fixedly connected to a furnace wall 12, the inner surface of the shell bottom 14 is fixedly connected to a refractory layer 13, the furnace wall 12 and the refractory layer 14 are both made of refractory material and can resist the high temperature of molten steel. The shell bottom 14 is provided with a vent hole 141, the refractory layer 13 is provided with a gas-permeable brick at a position corresponding to the vent hole 141, gas enters the furnace body 1 through the gas-permeable brick after entering the vent hole, and bottom blowing of the furnace body 1 is realized. Further, the furnace wall 12 is provided with a tapping hole 121 on one side, the tapping hole 121 and the first hydraulic push rod 23 or the second hydraulic push rod 24 are located on the same side, after the furnace body 1 is tilted to one side of the tapping hole 121, the molten steel can flow out along the tapping hole 141.

[0043] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the technical field, without departing from the principle of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A bottom-blowing electromagnetic stirring device comprising a furnace body (1), a base (2), a bridge (3) and an electromagnetic stirring body (4), two bases (2) are arranged on the bottom of the furnace body (1) respectively, characterized in that, The base (2) comprises a W-shaped support (21) and a crossbeam (22), the middle top end of the W-shaped support (21) is hingedly connected with the middle of the crossbeam (22), the two ends of the crossbeam (22) are respectively hingedly connected with the first end of a first hydraulic push rod (23) and a second hydraulic push rod (24), the second end of the first hydraulic push rod (23) and the second hydraulic push rod (24) are respectively hingedly connected with the bottom of the W-shaped support (21), and the bottom of the furnace body (1) is fixedly connected with the crossbeam (22) on both sides. The crossbeam (22) is fixedly connected with the bridge (3), the bridge (3) is fixedly connected with the electromagnetic stirring body (4), so that the electromagnetic stirring body (4) is in abutment with the bottom of the furnace body (1), and the bottom of the furnace body (1) is further communicated with a gas hole (141) for introducing gas into the furnace body (1), and the electromagnetic stirring body (4) is staggered with the gas hole (141).

2. The electromagnetic stirring apparatus with bottom-blowing according to claim 1, wherein The two top ends of the W-shaped support (21) are respectively hingedly connected with support seats (25), one side of the support seat (25) is provided with a connecting seat (251), the first end of a secondary hydraulic push rod (26) is hingedly connected with the connecting seat (251), and the second end of the secondary hydraulic push rod (26) is hingedly connected with the bottom of the W-shaped support (21).

3. The electromagnetic stirring apparatus with bottom-blowing according to claim 1, wherein The electromagnetic stirring body (4) comprises an outer shell (41) and an iron core (42), the iron core (42) is wound with a coil (43) to form an inductor, and a plurality of inductors are fixed in the outer shell (41) in sequence through a screw rod (44).

4. The electromagnetic stirring apparatus with bottom-blowing according to claim 3, wherein A through hole is formed in the iron core (42), the screw rod (44) passes through the through hole, and the two ends of the screw rod (44) are fixedly connected with the two sides of the outer shell (41).

5. The electromagnetic stirring apparatus with bottom-blowing according to claim 3, wherein The curvature of the outer shell (41) is consistent with the curvature of the bottom of the furnace body (1), and adjacent inductors are arranged at a preset angle to correspond to the curvature of the outer shell (41).

6. The electromagnetic stirring apparatus with bottom-blowing according to claim 3, wherein The iron core (42) is stacked by silicon steel sheets, the winding direction of the coil (43) is the stacking direction of the iron core (42), or the winding direction of the coil (43) comprises the stacking direction of the iron core (42) and a direction perpendicular to the stacking direction of the iron core (42).

7. The electromagnetic stirring apparatus with bottom-blowing according to claim 3, wherein One end of the outer shell (41) away from the furnace body (1) is provided with a mounting foot (45), and the mounting foot (45) is fixedly connected with the bridge (3).

8. The electromagnetic stirring apparatus with bottom-blowing according to claim 1, wherein The furnace body (1) comprises a supporting plate (11) and a shell bottom (14), the supporting plate (11) is fixedly connected with the outer periphery of the shell bottom (14) to form a cavity, the inner surface of the supporting plate (11) is fixedly connected with a furnace wall (12), the inner surface of the shell bottom (14) is fixedly connected with a refractory layer (13), and the furnace wall (12) and the refractory layer (13) can resist the high temperature of molten steel.

9. The electromagnetic stirring apparatus with bottom-blowing according to claim 8, wherein The shell bottom (14) is provided with a ventilation hole (141), and the refractory layer (13) is provided with a gas-permeable brick at a position corresponding to the ventilation hole (141).

10. The electromagnetic stirring apparatus with bottom-blowing according to claim 8, wherein A tapping hole (121) is arranged on one side of the furnace wall (12), and the tapping hole (121) is located on the same side as the first hydraulic push rod (23) or the second hydraulic push rod (24).

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