External electromagnetic stirring device for electroslag remelting

Abstract

The utility model discloses an external electromagnetic stirring device for electroslag remelting, which comprises an external magnetic field generating device which comprises a shell, a rotating magnetic field generating device, a traveling wave magnetic field generating device and a temperature measuring device, the temperature measuring assemblies correspond to the upper-layer magnetic field generating mechanism, the middle-layer magnetic field generating mechanism and the lower-layer magnetic field generating mechanism and measure the temperature of the magnetic field generating mechanism of the corresponding layer; the control panel is arranged outside the shell and used for controlling start and stop of the movable clamping device, the external magnetic field generating device and the temperature measuring assembly and displaying related data; due to the implementation of the stirring device, the refining effect of the electroslag remelting device on special steel can be effectively improved, high-quality special steel can be obtained under the condition that vacuum self-consumption and atmosphere protection of an electroslag furnace are not adopted, and possibility is provided for manufacturing of high-end mechanical equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of metal secondary refining equipment, in particular to an external electromagnetic stirring device used for electroslag remelting. Background Art

[0002] Electroslag remelting is a secondary refining technology that can effectively remove some large-sized oxide inclusions and harmful elements in mold steel. Therefore, it has been widely used in the production of high-quality special steels. See patent applications No. 201320727046.4 and 201910366010.X. The principle of the current traditional electroslag remelting process is to use alloy steel as a consumable electrode in a water-cooled crystallizer containing high-alkaline molten slag, and use the conductivity of the molten slag. The resistance heat generated when the current passes through the slag is used as a heat source to remelt the consumable electrode. Studies have shown that during the electroslag remelting process, the consumable electrode melts to form a molten droplet. When the molten droplet passes through the slag layer, the inclusions in it are adsorbed by the alkaline slag layer. In view of this, how to make the metal droplet fully contact with the high-alkaline molten slag has become a key factor in improving the impurity removal efficiency. A variety of new methods have been developed to improve the purification efficiency of electroslag remelting, mainly including composite electroslag remelting with a rotating magnetic field, composite electroslag remelting with ultrasonic waves, and electroslag remelting with a horizontal static magnetic field. However, objectively speaking, the above methods all have their shortcomings. For example, applying a rotating magnetic field to composite electroslag remelting can drive the slag liquid and the metal pool to rotate to a certain extent, but it will produce negative effects such as slag rolling; ultrasonic composite electroslag remelting is limited in its industrial application due to factors such as power limitation, its own directionality and excessive attenuation speed; applying a horizontal static magnetic field to electroslag remelting is still limited in its ability to improve the purification effect due to its low energy density and directional characteristics.

[0003] In addition to the above, another disadvantage of the current electroslag remelting process is that it generally has high energy consumption and relatively limited applicability, which is also a problem that many manufacturers are currently worried about. Utility Model Content

[0004] The purpose of the utility model is to provide an external electromagnetic stirring device for electroslag remelting in view of the above situation. The implementation of the utility model can effectively improve the refining effect of the electroslag remelting device on special steel.

[0005] The specific scheme of the utility model is: an external electromagnetic stirring device for electroslag remelting, comprising:

[0006] An external magnetic field generating device, the external magnetic field generating device comprises a shell, a rotating magnetic field generating device, a traveling wave magnetic field generating device and a temperature measuring device, the shell is cylindrical, the rotating magnetic field generating device is fixedly mounted on the inner side wall of the shell, the rotating magnetic field generating device comprises an upper magnetic field generating mechanism, a middle magnetic field generating mechanism and a lower magnetic field generating mechanism; the traveling wave magnetic field generating device is arranged in the cylinder of the shell, the traveling wave magnetic field generating device comprises a vertical supporting device and a traveling wave magnetic field generating assembly, the traveling wave magnetic field generating assembly is arranged on the vertical supporting device, and the vertical supporting device is positioned and connected to the inner side wall of the shell through a positioning mechanism;

[0007] A temperature measuring component, which corresponds to the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism, and measures the temperature of the magnetic field generating mechanism of the corresponding layer;

[0008] The control panel is arranged outside the shell and is used for starting and stopping the external magnetic field generating device and the temperature measuring component and displaying the relevant data.

[0009] Furthermore, the structures of the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism described in the utility model are the same, and each is composed of six groups of rotating magnetic field coils. Three-phase alternating current is passed through each group of rotating magnetic field coils. Each group of rotating magnetic field coils is correspondingly wound on a winding pole. The six winding poles are evenly distributed in a ring shape and each is fixed to the inner wall of the outer shell by bolts.

[0010] Furthermore, the vertical support device described in the utility model is composed of six support columns, which are evenly arranged in a ring shape in the outer shell when viewed from a top-down perspective. A number of support plates are arranged on the inner wall of each support column from top to bottom, and a traveling wave magnetic field coil is placed on each layer of support plates. The distance between the traveling wave magnetic field coil and the central axis of the outer shell is smaller than the distance between the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism and the central axis of the outer shell.

[0011] Furthermore, the inner side walls of the supporting column housing in the utility model are connected by a positioning mechanism, and are staggered with the coils generating magnetic fields in the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism in the top view direction.

[0012] Furthermore, the traveling wave magnetic field coils described in the utility model are provided with 12 from top to bottom, and an alternating current is passed through each traveling wave magnetic field coil.

[0013] Furthermore, the temperature measuring component described in the utility model has a temperature measuring column, which is connected to the vertical supporting device. Three temperature measuring probes are arranged on the inner wall of the temperature measuring column from top to bottom. The three temperature measuring probes correspond to the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism, respectively, and measure the temperatures of the upper, middle and lower layers of the electroslag remelting crystallizer accordingly.

[0014] Furthermore, the control panel in the utility model is provided with a power switch, an emergency stop button, a temperature display, a magnetic field switch of a rotating magnetic field generating device, a magnetic field switch of a traveling wave magnetic field generating device, and a magnetic field working status indicator light.

[0015] Corresponding to the entire device in the utility model, an external mobile clamping device is also provided, and the mobile clamping device is used to clamp the electrode rod and move it up and down; the mobile clamping device has a longitudinal track, and a lifting device is arranged on the longitudinal track, and a clamping claw driven by an oil cylinder is arranged on the lifting device, and the clamping claw is used to clamp the electrode rod.

[0016] Furthermore, the shell in the utility model is a cylindrical structure, the inner bottom of the cylindrical structure is provided with an annular bottom plate, a circular or square hole is provided in the middle of the annular bottom plate, and the bottom of the vertical support device stands on the annular bottom plate.

[0017] Furthermore, hooks are provided at symmetrical positions on the outer side wall of the cylindrical structure in the utility model.

[0018] The implementation of the stirring device of the utility model can effectively improve the refining effect of the electric slag remelting device on special steel. Without using a vacuum self-consumable and atmosphere-protected electric slag furnace, high-quality special steel can be obtained, which provides the possibility for the manufacture of high-end mechanical equipment. At the same time, during its use, it has the effect of energy saving and consumption reduction, and has good practical use and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the external magnetic field generating device in the utility model when viewed from above;

[0021] Figure 3 This is a schematic diagram of the main cross-sectional structure of the housing in the utility model;

[0022] Figure 4 yes Figure 3 A schematic diagram of the structure in a top-down direction;

[0023] Figure 5 This is a schematic diagram of the structure of the traveling wave magnetic field generating device in the utility model;

[0024] Figure 6 yes Figure 5 A schematic diagram of the structure in a top-down direction;

[0025] Figure 7 It is a structural schematic diagram of the temperature measuring component in the utility model;

[0026] Figure 8 It is a schematic diagram of the structure of the control panel in the utility model.

[0027] In the figure: 1—lifting device, 2—rotating magnetic field generating device, 3—longitudinal track, 4—housing, 5—clamping claw, 6—electrode rod, 7—crystallizer, 8—hook, 9—traveling wave magnetic field coil, 10—control panel, 11—upper magnetic field generating mechanism, 12—middle magnetic field generating mechanism, 13—lower magnetic field generating mechanism, 14—annular bottom plate, 15—support column, 16—support pallet, 17—temperature measuring probe, 18—cable connector, 19—power access port, 20—temperature measuring column. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings of the utility model to clearly and completely describe the technical solution of the utility model. It is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the utility model. In the description of the utility model, it should be noted that the terms "upper", "lower", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when used, which is only for the convenience of describing the utility model or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] See also Figures 1 to 8 The utility model is an external electromagnetic stirring device for electroslag remelting, comprising:

[0031] An external magnetic field generating device, the external magnetic field generating device includes a shell 4, a rotating magnetic field generating device, a traveling wave magnetic field generating device and a temperature measuring device, the shell is cylindrical, the rotating magnetic field generating device is fixedly installed on the inner wall of the shell, the rotating magnetic field generating device includes an upper magnetic field generating mechanism 11, a middle magnetic field generating mechanism 12 and a lower magnetic field generating mechanism 13, further, the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism in the utility model have the same structure, each of which is composed of six groups of rotating magnetic field coils, three-phase alternating current is passed through each group of rotating magnetic field coils, each group of rotating magnetic field coils is correspondingly wound on a winding pole, the six winding poles are evenly distributed in an annular shape and each is fixed to the inner wall of the shell by bolts; the traveling wave magnetic field generating device is arranged in the cylinder of the shell, the traveling wave magnetic field generating device includes a vertical support device and a traveling wave magnetic field generating component, and the traveling wave magnetic field generating component is placed in the On the vertical support device, the vertical support device is positioned and connected with the inner wall of the shell through a positioning mechanism; further, the vertical support device described in the utility model is composed of six support columns 15, and the six support columns are evenly arranged in a ring shape in the shell from a top-down perspective, and a plurality of support trays 16 are arranged on the inner wall of each support column from top to bottom, and a traveling wave magnetic field coil 9 is placed on the support tray of each layer, and the distance between the traveling wave magnetic field coil and the central axis of the shell is less than the distance between the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism and the central axis of the shell; further, the traveling wave magnetic field coils described in the utility model are arranged in 12 from top to bottom, and an alternating current is passed through each traveling wave magnetic field coil; further, the inner walls of the shell of the support column described in the utility model are connected by a positioning mechanism, and are staggered with the coils generating magnetic fields in the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism in the top-down direction.

[0032] A temperature measuring component, the temperature measuring component corresponds to the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism, and measures the temperature of the magnetic field generating mechanism of the corresponding layer; further, the temperature measuring component in the utility model has a temperature measuring column 20, the temperature measuring column is connected to the vertical support device, and three temperature measuring probes 17 are arranged on the inner wall of the temperature measuring column from top to bottom, and the three temperature measuring probes correspond to the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism, respectively, and measure the temperatures of the upper, middle and lower layers of the electroslag remelting crystallizer 7;

[0033] The main function of the temperature measuring component in the utility model is to detect whether the molten pool of electroslag remelting reaches the magnetic field of the corresponding layer. If it reaches it, the lower magnetic field is closed (for the solidified steel ingot, the magnetic field has no effect) to achieve the purpose of energy saving.

[0034] The control panel 10 is arranged outside the housing and is used for starting and stopping the external magnetic field generating device and the temperature measuring component and displaying related data. Furthermore, the control panel in the utility model is provided with a power switch, an emergency stop button, a temperature display, a magnetic field switch of the rotating magnetic field generating device, a magnetic field switch of the traveling wave magnetic field generating device, and a magnetic field working status indicator. The control panel mainly controls the magnetic field size adjustment, the position detection of the molten pool, and the opening and closing of the hierarchical magnetic field.

[0035] The utility model also has an external mobile clamping device, which is used to clamp the electrode rod 6 and move it up and down. In this embodiment, the mobile clamping device has a longitudinal track 3, on which a lifting device 1 is provided, and on which a clamping claw 5 driven by an oil cylinder is provided, which is used to clamp the electrode rod 6.

[0036] Furthermore, the shell in this embodiment is a cylindrical structure, the inner bottom of the cylindrical structure is provided with an annular bottom plate 14, a circular or square hole is provided in the middle of the annular bottom plate, and the bottom of the vertical support device stands on the annular bottom plate. Furthermore, hooks 8 are also provided at symmetrical positions on the outer side wall of the cylindrical structure in the utility model.

[0037] The utility model is to set an electromagnetic stirring device outside the crystallizer of electroslag remelting, which includes a transverse wave magnetic field (i.e., a rotating magnetic field generating device) and a traveling wave magnetic field. The transverse wave magnetic field is mainly used to break up the large columnar crystals formed during the crystallization of the electroslag ingot, improve the segregation of the material, and provide good conditions for the subsequent forging process. The traveling wave magnetic field is mainly used to remove some fine oxide inclusions. The small oxide inclusions float to the slag layer under the action of the transverse wave magnetic field, and then are adsorbed and removed by the slag layer. The strength of the two magnetic fields can be adjusted to adapt to different special steel materials and ingot sizes. At the same time, considering the locality and mobility of the electroslag molten pool, an energy-saving device is set, and the metal after crystallization will no longer be applied with an external magnetic field. The implementation of this project can effectively improve the refining effect of the electroslag remelting device on special steel, and can also obtain high-quality special steel without using vacuum self-consumption and atmosphere protection electroslag furnace, which provides the possibility for the manufacture of high-end mechanical equipment.

[0038] The functions of the various components in the device of the utility model are further described below.

[0039] General description of the device:

[0040] A mobile clamping device, which includes a longitudinal guide rail to ensure that the clamping device can move longitudinally; an electrode rod, which is fixed by the clamping device and enters the crystallizer and the electromagnetic stirring device at the bottom when in use, and cuts the magnetic flux lines to generate electromagnetic force for stirring; a crystallizer, a melting crystallization roller; a shell of the electromagnetic stirring device, which is used to fix the relevant structure of the magnetic field generation and connect with the external control cabinet; a hook on the shell: used for the overall up and down lifting and movement of the device; a rotating magnetic field generating device: a three-phase alternating current excites the magnetic field to make it rotate horizontally around the ingot; a traveling wave magnetic field: an alternating current excites the magnetic field to make it rotate longitudinally in a directional manner; a control panel, which includes a main power switch, an emergency stop button, a temperature display, a magnetic field switch, a magnetic field working indicator light and other components.

[0041] Rotating magnetic field generating device: When alternating current is passed through the agitator winding, a rotating magnetic field is generated. The rotating magnetic field cuts the metal melt to generate an induced current and a rotating electromagnetic force. The rotating magnetic field has three layers, upper, middle and lower, with 6 sets of coils in each layer. Each set of coils is wound through a winding post fixed to the shell, and the winding post is fixed by a nut. When the device is working, the lower magnetic field generating mechanism of the lowest layer first performs electromagnetic stirring. When the corresponding temperature indicator light comes on, the magnetic field of the middle magnetic field generating mechanism starts, and the magnetic field of the lower magnetic field generating mechanism is turned off; the device continues to heat up, and when the middle thermometer indicator lights up, the magnetic field of the upper magnetic field generating mechanism starts and the middle magnetic field generating mechanism is turned off, thereby achieving temperature regulation and stirring the metal melt in the crystallizer in sections.

[0042] Positioning mechanism: It is installed at the bottom of the shell and positioned through the card slot to fix the relevant components, so that the internal components are stable and do not shake.

[0043] Temperature measuring components: The temperature measuring probe and the thermometer are respectively connected and installed with the corresponding indicator lights, and displayed on the control panel. As long as the set temperature is reached, the indicator lights will prompt the switching of the working states of various magnetic fields.

[0044] Traveling wave magnetic field generator: The traveling wave magnetic field can provide electromagnetic stirring force up and down for the liquid to be stirred. The traveling wave magnetic field has 12 sets of coils, divided into two layers, and the traveling wave magnetic field support column is used to limit the placement of the traveling wave magnetic field coils. There are a total of six columns, and each column has 12 support trays from top to bottom to place the traveling wave magnetic field coils.

[0045] In the initial stage, the lower traveling wave magnetic field is used for stirring. When the indicator light of the thermometer on the lowest layer lights up, the traveling wave magnetic field on the upper layer is started and the traveling wave magnetic field on the lower layer is turned off, thereby realizing electromagnetic stirring of the molten steel in the crystallizer from top to bottom while saving energy.

[0046] Control cabinet: control panel, which controls the two electromagnetic fields, including: main power switch, emergency stop button, temperature display, magnetic field switch and magnetic field working indicator light.

[0047] The power access port is used to connect the three-phase power used by the magnetic field and the two-phase power used by the thermometer and control panel.

[0048] Cable connector at the electromagnetic stirrer housing, where the stirrer housing is welded to the control panel of the control cabinet and the control line is connected here.

[0049] During the working stage, turn on the main power supply through the control panel, turn on the traveling wave magnetic field and the bottom layer of the rotating magnetic field through the knob switch, and the corresponding indicator lights up. When the temperature reaches the specified temperature, the magnetic field conversion indicator lights up at the bottom layer, and the second layer of the magnetic field is turned on and the first layer of the rotating magnetic field is turned off. When the temperature reaches the specified temperature, the magnetic field conversion indicator lights up, and the third layer is turned on and the second layer of the rotating magnetic field is turned off. The working indicator light on the control panel indicates that the magnetic field is turned on, and no light indicates that it is turned off.

Claims

1. An external electromagnetic stirring device for electroslag remelting, characterized in that: Included are: An external magnetic field generating device, the external magnetic field generating device comprises a shell, a rotating magnetic field generating device, a traveling wave magnetic field generating device and a temperature measuring device, the shell is cylindrical, the rotating magnetic field generating device is fixedly mounted on the inner side wall of the shell, the rotating magnetic field generating device comprises an upper magnetic field generating mechanism, a middle magnetic field generating mechanism and a lower magnetic field generating mechanism; the traveling wave magnetic field generating device is arranged in the cylinder of the shell, the traveling wave magnetic field generating device comprises a vertical supporting device and a traveling wave magnetic field generating assembly, the traveling wave magnetic field generating assembly is arranged on the vertical supporting device, and the vertical supporting device is positioned and connected to the inner side wall of the shell through a positioning mechanism; A temperature measuring component, which corresponds to the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism, and measures the temperature of the magnetic field generating mechanism of the corresponding layer to detect whether the molten pool of the electroslag remelting reaches the magnetic field of the corresponding layer; The control panel is arranged outside the shell and is used for starting and stopping the external magnetic field generating device and the temperature measuring component and displaying the relevant data.

2. The external electromagnetic stirring device for electroslag remelting according to claim 1, characterized in that: The structures of the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism are the same, and each is composed of six groups of rotating magnetic field coils. Three-phase alternating current is passed through each group of rotating magnetic field coils. Each group of rotating magnetic field coils is correspondingly wound on a winding pole. The six winding poles are evenly distributed in a ring shape and each is fixed to the inner wall of the outer shell by bolts.

3. The external electromagnetic stirring device for electroslag remelting according to claim 1, characterized in that: The vertical support device is composed of six support columns, which are evenly arranged in a ring shape in the shell when viewed from a top-down perspective. A number of support plates are arranged on the inner wall of each support column from top to bottom, and a traveling wave magnetic field coil is placed on each layer of support plates. The distance between the traveling wave magnetic field coil and the central axis of the shell is smaller than the distance between the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism and the central axis of the shell.

4. The external electromagnetic stirring device for electroslag remelting according to claim 3, characterized in that: The inner side walls of the supporting column shells are connected by a positioning mechanism, and are staggered with the coils generating magnetic fields in the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism in the top view direction.

5. The external electromagnetic stirring device for electroslag remelting according to claim 3, characterized in that: There are 12 traveling wave magnetic field coils arranged from top to bottom, and an alternating current is passed through each traveling wave magnetic field coil.

6. The external electromagnetic stirring device for electroslag remelting according to claim 1, characterized in that: The temperature measuring component has a temperature measuring column, which is connected to the vertical supporting device. Three temperature measuring probes are arranged on the inner wall of the temperature measuring column from top to bottom. The three temperature measuring probes correspond to the upper magnetic field generating mechanism, the middle magnetic field generating mechanism and the lower magnetic field generating mechanism respectively, and measure the temperatures of the upper, middle and lower layers of the electroslag remelting crystallizer accordingly.

7. The external electromagnetic stirring device for electroslag remelting according to claim 1, characterized in that: The control panel is provided with a power switch, an emergency stop button, a temperature display, a magnetic field switch of a rotating magnetic field generating device, a magnetic field switch of a traveling wave magnetic field generating device, and a magnetic field working status indicator light.

8. The external electromagnetic stirring device for electroslag remelting according to claim 1, characterized in that: The shell is a cylindrical structure, the inner bottom of the cylindrical structure is provided with an annular bottom plate, a circular or square hole is provided in the middle of the annular bottom plate, and the bottom of the vertical support device stands on the annular bottom plate.

9. The external electromagnetic stirring device for electroslag remelting according to claim 8, characterized in that: Hooks are also provided at symmetrical positions on the outer side wall of the cylindrical structure.

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