WO2014177052A1 - Induction heating and electromagnetic stirring device for riser head of steel ingot - Google Patents

Abstract

Disclosed is an induction heating and electromagnetic stirring device for a riser head of a steel ingot, which can be used for the heating, heat insulation and electromagnetic stirring of a riser head part of a ingot made of ferrous and nonferrous metal material. In the device, induction coils (5a, 5b, 5c) are vertically placed outside a riser head insulating sleeve (2) of a steel ingot, and are connected to a power cabinet (7) via water cooling cables, and magnetic yokes (10) are uniformly distributed outside the induction coils (5a, 5b, 5c) in a circumferential direction. After power on, a magnetic field is formed around the riser head of the steel ingot, and induction heating is conducted on a molten steel at the riser head, so as to compensate for the heat loss of the riser head in a steel ingot freezing process; and at the same time, a metal melt generates the effect of electromagnetic stirring under the action of the magnetic field, so as to form the circulation in which the molten metal at the central part of the riser head of the steel ingot moves upwards, and the molten metal at the side part of the riser head of the steel ingot moves downwards, thereby being beneficial in eliminating gas and impurities in the melt.

Description

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metallurgical and mechanical manufacturing industry, and more particularly to a device suitable for ingot induction heating and electromagnetic stirring of steel ingots in the production of large steel ingots, by adjusting the input to The electric power of the electromagnetic induction coil can inductively heat and electromagnetically stir the riser metal liquid of different sizes of steel ingots, reduce the size of the riser, and improve the purity of the ingot body. BACKGROUND OF THE INVENTION With the development of heavy equipment, metallurgy, thermal power, and nuclear power, the quality requirements for large forgings are becoming more and more strict. Large steel ingots are used as raw materials for forgings, and their quality directly affects and determines the quality of forgings, especially for large forgings. The development of large-scale and high-alloying requires the use of forged steel ingots or slabs to meet the requirements of over-large and high-densification.

 Ingot casting process of large ingots (including various kinds of slabs of various metal materials), in the process of solidification of liquid metal, it is necessary to add a large amount of high-temperature molten steel to the riser portion to fill the space for solidification and shrinkage of the ingot. Due to the long solidification process of large steel ingots, the riser molten steel (including various liquid black and non-ferrous metals for the convenience of description, collectively referred to as molten steel, the same below) is also in the process of solidification of the ingot. In the later stage of solidification of the ingot, it is difficult to ensure that there is enough high-temperature molten steel to complete the feeding of the ingot. Therefore, in the industrial production, the method of increasing the ratio of the riser is often used to prolong the rise time of the riser, and the riser is sufficient. The molten steel is used for the indentation of the ingot. Usually, the ratio of the ingot riser is increased to 18-25%. Although this method can meet the requirements of the ingot, it significantly reduces the utilization of the ingot, which not only increases the production. Cost, also waste a lot of valuable resources.

How to ensure that the riser has sufficient molten steel to replenish the ingot without increasing the proportion of the riser, which becomes a bottleneck that is difficult to break through in the production of steel ingots. At present, the riser insulation of steel ingots adopts low thermal conductivity materials. Immediately after the ingot casting is completed, the heat insulating agent and the heat generating agent are added, so that the riser steel liquid is in a low heat conduction and heat preservation environment, thereby reducing the riser steel liquid direction. The heat loss around it delays the solidification process of the riser. On this basis, there are those who use electric heating risers in industrial production, and some researchers try to compensate for the heat loss of the riser by heating methods such as electric arc, plasma and chemical methods, further delay the solidification process of the riser molten steel, and strengthen the riser. The role of feeding. However, the above-mentioned techniques have shortcomings. Resistive electric risers have slow heat transfer and poor controllability. The heat input by arc and plasma heating is mainly concentrated near the heating body, and the heating area is small and the thermal efficiency is low. Chemical heating is easy to pollute. Liquid steel. Summary of the invention In order to overcome the deficiencies and defects of the existing ingot casting technology, the present invention provides a steel ingot induction heating and electromagnetic stirring device. The invention uses an induction coil to form a magnetic field, which can not only inductively heat the steel ingot riser, but also reduce the riser. The solidification rate increases the feeding capacity of the riser, and at the same time improves the flow state of the molten metal, promotes the inclusions to fully float, and improves the purity of the ingot.

 The technical solution adopted by the present invention to solve the technical problem is as follows: the steel ingot induction heating and electromagnetic stirring device comprises a base, a support arm and an induction coil, and the outer surface of the side wall of the base is symmetrically arranged with the lifting lug. The base is made of refractory insulation material to form a riser insulation sleeve, and an induction coil is vertically placed outside the riser insulation sleeve, and the induction coil is connected to the power supply cabinet through a water-cooled cable, and the outer circumference of the induction coil is uniformly distributed in the circumferential direction, and the yoke is yoke The outer side is clamped and fastened with a stainless steel plate. The stainless steel plate is fixed on the support arm, the support arm is fixed in the groove of the base, the cooling water system is connected with the induction coil, and the cooling water is passed through to cool the induction coil.

 In the present invention, the power cabinet can use a three-phase power frequency power supply (frequency is 50 Hz-60 Hz). Six sets of induction coils are placed vertically outside the riser refractory insulation material. The six sets of induction coils are connected by three-phase six-group coil connection, specifically from the top of the riser downward, the first set of coils and the fourth set of coils are connected in series. The second group of coils and the fifth group of series coils, the third group of coils and the sixth group of coils are connected in series, and then connected to each phase of the three-phase power frequency power supply through water-cooled cables. Alternatively, four sets of induction coils can be placed vertically outside the riser refractory insulation material, and the four sets of induction coils can be connected by two-phase four-group coil connection. Specifically, the first group of coils and the third group of coils are connected in series from the top of the riser, and the second group of coils and the fourth group of coils are connected in series, and the "T" connection method is adopted, and the three-phase power frequency power supply is connected through the water-cooled cable.

 In the present invention, the power cabinet can also use a thyristor intermediate frequency power source (frequency of 100 Hz-5000 Hz), and the induction coil is placed outside the riser sleeve, and the induction coil is used as a single-phase load, and is connected to the thyristor through a water-cooled cable. Power supply cabinet.

 In the present invention, the induction coil has the same structure, and may be spirally formed by a pure copper tube having a different-shaped cross section or a rectangular cross section, and a wall thickness d=2 mm to 50 mm near the riser side, and the outer surface of the induction coil is covered with a mica tape. And coated with insulating varnish.

 In the present invention, the yoke is formed by stacking silicon steel sheets, and the cross-sectional shape of the yoke may be "匚" shape, "shape or

"L" shape, the contact part of the stainless steel plate and the silicon steel sheet is separated by a mica plate, the yoke is evenly distributed around the induction coil in the circumferential direction, and the mica plate is tightly pressed between the yoke and the coil to reduce the vibration of the coil , to avoid damage to the insulation of the induction coil. The yoke mainly acts as a magnetic shield, and the magnetic lines of the constraining induction coil are diverged outward, which not only improves the induction heating efficiency, but also prevents the ingot body from being heated by induction heating.

In the present invention, the base material is made of stainless steel, and a gap is left between the yoke and the base, and is filled in the gap. The insulating insulation material is insulated.

 In the invention, the riser insulation sleeve is assembled from refractory bricks and insulation panels, and the riser insulation jacket has a wall thickness of 20 mm-200 mm, and the riser insulation sleeve is fixed on the base to ensure sufficient strength of the riser insulation jacket. Resist the hydrostatic pressure of the riser steel while ensuring no ferromagnetic material between the riser sleeve and the induction coil.

 In the present invention, the thermocouple is wrapped in the corundum protection tube, inserted into the metal liquid of the riser, connected to the recorder through the wire, the temperature of the riser molten steel is detected, and the cooling process of the riser portion is fed back, and adjusted according to the feedback information. The input power of the power supply controls the riser solidification process.

 In the present invention, the cooling water system supplies cooling water to the induction coil, the cooling water cools the induction coil, and a temperature measuring device is provided at the water outlet for measuring the water temperature, and the required outlet water temperature is not higher than 55 °C.

 The heat generated in the induction heating process of the present invention is basically generated by the molten metal in the "hot vortex penetration depth", and the heat of the internal molten metal is mainly obtained by the heat conduction method, and the "hot vortex penetration depth" is more Large, the volume of induction heating is larger, and the "hot eddy penetration depth" is inversely proportional to the 1/2 power input to the coil current frequency. The power frequency is lower than the intermediate frequency, and the frequency is low. The depth of penetration is "deep, and the volume of heating is large. Taking 15# carbon steel at 1550 °C as an example, the power frequency "hot vortex penetration depth" is 90 mm, and the intermediate frequency 500 Hz "hot vortex penetration depth" is 28 mm.

 In the invention, the power frequency power supply is adopted, and the multi-phase winding coil can be used, and the three-phase six-group coil connection method or the two-phase four-group coil connection method is connected to the three-phase power frequency power supply (current frequency 50 Hz-60 Hz), after the power is turned on. The coil forms a magnetic field, and the type of the magnetic field is different from the type of the magnetic field formed by the single-phase coil winding of the intermediate frequency induction heating. Under the action of the magnetic field, the molten metal in the center of the riser of the steel ingot moves upward, and the molten metal at the edge of the riser of the steel ingot moves downward. The internal circulation of the metal melt is formed, and the inclusions are fully floated under the upward flow of the center of the riser of the steel ingot, which is beneficial to reduce inclusions inside the ingot and improve the quality of the ingot;

 Alternatively, in the present invention, a single-phase winding coil may be connected to the thyristor intermediate frequency power supply, and after the intermediate frequency power supply is turned on, the coil forms a magnetic field, and under the action of the magnetic field, the molten metal at the center of the riser of the steel ingot is squeezed upward and downward. , forming a segmented circulation. Since the electromagnetic stirring force is inversely proportional to the 1/2 power input to the coil current frequency, the intermediate frequency power supply is weaker than the power frequency power supply, and the intermediate frequency power supply is suitable for the case where the stirring effect is weak.

 The heating, the intensity of the agitation and the rate of temperature rise of the molten steel in the induction heating process of the present invention can be completely controlled by the power of the power source input to the induction coil.

The invention has the following beneficial effects: The invention belongs to induction heating. In the induction heating process, the heat is the volumetric heat directly generated by the molten metal in the "hot vortex penetration depth", the heating volume is large, and the heat efficiency is high. Inductive heating of the riser steel by induction coils, compensating for the heat loss of the riser during solidification of the ingot, and prolonging the solidification of the riser molten steel Time, to ensure that the riser has enough molten steel to replenish the ingot body, which is beneficial to reduce the proportion of risers and increase the utilization rate of steel ingots. The electromagnetic stirring force in the molten steel is inversely proportional to the square root of the power supply current frequency. The lower the frequency, the greater the stirring force. In the case of the three-phase power frequency power supply in the power cabinet of the present invention, multiple sets of coils are used, and three-phase six-group coils are connected. The method or the two-phase four-group coil connection is connected to the three-phase power frequency power supply, and after the power is turned on, a large electromagnetic stirring force is formed inside the melt to accelerate and change the movement state of the melt, and this movement is beneficial to the steel ingot riser on the one hand. The high temperature melt in the central region washes the front of the crystal, causing the recrystallization of the dendrites at the crystallization front. On the other hand, the electromagnetic stirring force produces mechanical shearing force on the growing dendrites, which breaks the dendrites, thus preventing the dendrite arms. Interlaced and cross-connected to ensure the smoothness of the feeding channel, effectively eliminating the formation of secondary shrinkage holes. Induction heating is used to reduce the rate of temperature drop of the riser molten steel, providing favorable temperature conditions for the inclusions to float. At the same time, the invention adopts an induction coil which can be connected to a three-phase power frequency power supply by a three-phase six-group coil connection method or a two-phase four-group coil connection method, and the current frequency is 50 Hz-60 Hz. After the power is turned on, the coil forms a magnetic field, the molten steel Under the action of the magnetic field, the electromagnetic stirring effect is generated, so that the molten metal in the center of the riser of the steel ingot moves upward, and the molten metal at the edge of the riser of the steel ingot moves downward to form an overall circulation, which is driven by the upward flow of the molten steel in the center to promote the melt. The gas and inclusion particles are fully floated, reducing inclusions in the molten steel and improving the quality of the ingot. The power supply cabinet of the invention can also adopt the intermediate frequency thyristor power supply, the current frequency is 100Hz-5000Hz, the single-phase winding coil is connected to the intermediate frequency thyristor power supply through the water-cooled cable, and the power input to the electromagnetic induction coil is conveniently adjusted by the intermediate frequency thyristor power supply. And frequency, adapt to the riser insulation of different tonnage steel ingots. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a steel ingot induction heating and electromagnetic stirring device according to an embodiment of the present invention, using a three-phase power frequency power supply cabinet (three-phase six-group coil);

 2 is a steel ingot induction heating and electromagnetic stirring device according to an embodiment of the present invention, which adopts a three-phase power frequency power supply cabinet

Top view of (three-phase six-group coil);

 3 is a schematic structural view of a steel ingot induction heating and electromagnetic stirring device according to another embodiment of the present invention, which adopts a three-phase power frequency power supply cabinet (two-phase four-group coil);

 4 is a schematic view showing the structure of a "匚"-shaped yoke of a steel ingot induction heating and electromagnetic stirring device according to an embodiment of the present invention;

 5 is a schematic structural view of a steel ingot induction heating and electromagnetic stirring device according to an embodiment of the present invention, which adopts an intermediate frequency thyristor power supply (single-phase coil);

6 is a cross-sectional view showing a profile of a coil inductive heating and electromagnetic stirring device of a steel ingot according to an embodiment of the present invention; 7 is a schematic diagram showing the circuit connection of a three-phase six-group coil of a steel ingot induction heating and an electromagnetic stirring device according to an embodiment of the present invention;

 Fig. 8 is a schematic view showing the circuit connection of two-phase four-group coils of a steel ingot induction heating and electromagnetic stirring device according to an embodiment of the present invention.

 Reference number:

 1. Steel ingot riser, 2. riser insulation sleeve, 3. base, 4. support arm 5a. six sets of induction coils, 5b. four sets of induction coils, 5c. single-phase coils 6. lifting lugs, 7. power cabinets, 8. Insulation, 9. Cooling water system, 10. Yoke, 11. Thermocouple, 12. Recorder. DETAILED DESCRIPTION OF THE INVENTION The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

 Example 1

1 and 2 are respectively a front view and a top view of a steel ingot induction heating and electromagnetic stirring device according to an embodiment of the present invention, using a three-phase power frequency power supply (three-phase six-group coil). As shown in Fig. 1 and Fig. 2, in this embodiment, the mass of the ingot is 137 tons, and the material is 0Crl3Ni4Mo stainless steel, and the pouring temperature is 1550 °C. The weight of the steel ingot 1 is 28 tons, the diameter of the lower end of the riser is 2550mm, the upper end of the riser is 2300mm, and the height of the riser is 1200mm. The riser sleeve 2 has a wall thickness of 20 mm to 200 mm, which is 120 mm in this embodiment, and may be 80 mm in other embodiments. The riser insulation sleeve 2 is assembled from refractory bricks and insulation panels, and the riser insulation sleeve 2 is fastened on the base 3, and the outer surface of the side wall of the base 3 is symmetrically disposed with the lifting lug 6. In this embodiment, the base 3 is made of stainless steel, and the riser sleeve 2 is placed on the base 3, and six sets of induction coils 5a, riser sleeves 2 and six sets of induction coils 5a are placed outside the riser sleeve 2. There is no ferromagnetic material between them. As shown in Fig. 6, the six sets of induction coils 5a are spirally formed by a special-shaped cross section pure copper tube, and the wall thickness d near the riser side is 2 mm to 50 mm, which may be 20mm. The outer surface is covered with mica tape and coated with insulating varnish, six sets of induction coils 5a, from top to bottom, the first set of coils and the fourth set of coils are connected in series, the second set of coils and the fifth set of series coils, the third group The coil and the sixth group of coils are connected in series, and then connected to the power cabinet 7 through water-cooled cables. The wiring pattern of the six sets of induction coils 5a and the power supply cabinet 7 is the circuit connection of the three-phase six-group coils shown in Fig. 7. The inner diameter of the coils is 2850 mm, the total height of the coils is 950 mm, and the spacing between each set of coils is 20 mm. And clamped with asbestos sheets. Three-phase power frequency power cabinet, current frequency is 50Hz, induction coil rated input power is 1300kW, sensor rated voltage is 750V, transformer primary voltage is 10000V, transformer secondary voltage is 750V. A set of 12 "匚" shaped yokes 10 are used to evenly surround the induction coil. The yoke 10 is evenly distributed along the circumferential direction of the six sets of induction coils 5a, wherein a gap is left between the yoke 10 and the base 3, and a heat insulating material is filled between the gaps. Yoke 10 from silicon The steel sheet is stacked, as shown in FIG. 4, the cross-sectional shape of the yoke 10 is "匚" shape, and the contact portion between the cover stainless steel plate and the silicon steel sheet is separated by a mica plate, and the outer side is clamped and fastened by a stainless steel plate. The welding form is fixed to the support arm 4, and the support arm 4 is connected to the base 3 through the groove. Of course, the present invention is not limited thereto, and the cross-sectional shape of the yoke 10 may be "shape" or "L" shape. The yoke 10 is evenly distributed around the six sets of induction coils 5a in the circumferential direction, the yoke 10 and the six sets of induction The coil 5a is tightened with a mica plate to reduce the vibration of the coil and avoid damage to the insulating layer of the induction coil. The cooling water system 9 is connected to the six sets of induction coils 5a, and the thermocouple 11 is wrapped with a corundum protection tube and inserted into the metal of the riser. In the liquid, the wire is connected to the recorder 12, and the temperature of the riser during the solidification process of the steel ingot can be measured, and the input power of the power source is adjusted according to the feedback information to control the riser solidification process.

 Before the ingot is poured, the steel ingot induction heating and electromagnetic stirring device are placed on the upper part of the ingot mold by the lifting lug 6, and then the ingot is cast. After the pouring is completed, the heat retaining agent 8 is added, and then the cooling water system 9 is turned on to supply the cooling water to the device of the present invention, and the six sets of induction coils 5a are cooled by the cooling water, and the temperature measuring device is provided at the water outlet for measuring the water. Temperature, the required water temperature is not higher than 55 °C. Then, the power cabinet 7 is turned on, so that the six groups of induction coils 5a inductively heat the riser steel to compensate the heat loss of the riser during the solidification process of the steel ingot, and electromagnetic stirring of the riser steel liquid improves the flow state of the riser molten steel. Promote inclusions to float. The thermocouple 11 is wrapped in a corundum protection tube with a wall thickness of 5 mm, inserted into the steel ingot riser, and the temperature of the ingot riser is fed back through the thermocouple 11 and the recorder 12 during the induction heating process, through the power cabinet 7 The power input to the six sets of induction coils 5a is adjusted to control the riser solidification process. After the ingot is solidified, turn off the power supply, and then turn off the cooling water system after 10 minutes. 9. Lift the steel ingot by the lifting lug 6 Induction heating and electromagnetic stirring device, and then complete the lifting and demoulding work of the steel ingot according to the normal steps.

 Example 2

3 is a schematic structural view of a steel ingot induction heating and electromagnetic stirring device according to the present invention, which adopts a three-phase power frequency power supply (two-phase four-group coil). The ingot has a mass of 3 tons and is made of 0Crl3Ni4Mo stainless steel with a pouring temperature of 1550 °C. The weight of the steel ingot is 0.5 tons, the diameter of the lower end of the riser is 550mm, the upper end of the riser is 500mm, and the height of the riser is 320mm. The riser insulation sleeve 2 has a wall thickness of 80 mm, and the riser insulation sleeve 2 is made of refractory bricks and fastened to the support structure, and the outer surface of the side wall of the base 3 is symmetrically disposed with the lifting lugs 6. A riser sleeve 2 is placed on the base 3, and four sets of induction coils 5b are placed outside the riser sleeve 2, no ferromagnetic material is between the riser sleeve 2 and the four sets of induction coils 5b, and the four sets of induction coils 5b are The special-shaped cross section pure copper tube disk is spiraled, and the wall thickness d near the riser side is 15mm, the outer surface is covered with mica tape, the copper tube is coated with insulating varnish, and the first group of coils and the fourth group of induction coils 5b are The three sets of coils are connected in series, and the second set of coils and the fourth set of coils are connected in series, and are connected to the three-phase power frequency power supply cabinet 7 through a water-cooled cable by a "T" connection method. The wiring pattern of the four sets of induction coils 5b and the power supply is the circuit connection of the two-phase four-group coils shown in Fig. 8. The inner diameter of the coils is 750 mm, the total height of the coils is 285 mm, and the spacing between each set of coils is 25 mm, three-phase. Power frequency The power cabinet has a current frequency of 50 Hz, the rated input power of the induction coil is 100 kW, and the rated voltage of the inductor is 380V. 12 sets of "匚"-shaped yokes 10 are used to evenly surround the induction coil 5b. The other parts of the second embodiment are the same as those of the first embodiment.

 Example 3

 5 is a schematic diagram of a steel ingot induction heating and electromagnetic stirring device according to the present invention, which adopts an intermediate frequency thyristor power supply (single-phase coil) structure; the invention is applied to a mass of 20 tons of AISI 304 stainless steel ingot, and the weight of the steel ingot is 3.8t The casting temperature of the ingot is 1600 °C, the diameter of the lower end of the riser is 1200 mm, the diameter of the upper end surface is l lOOmm, and the height is 600 mm. The riser insulation sleeve 2 is made of high-aluminum brick with a wall thickness of 120mm and fastened to the support structure. The base 3 is made of stainless steel, and the outer surface of the side wall is symmetrically provided with the lifting lug 6 . There is no ferromagnetic material between the riser sleeve 2 and the induction coil 5c, and the induction coil 5c is spirally formed by a rectangular copper tube with a rectangular cross section, the pitch of the coil is 8 mm, the outer surface is covered with a mica tape, and each coil is sprayed with Insulating varnish, the inner diameter of the coil is 1460mm, the total height of the coil is 630mm, and 8 sets of "匚" yokes are used to distribute the induction coil around. The power cabinet 7 is a thyristor power supply. The electrical parameters are current frequency 500Hz, and the coil rated power is 150kW. , Input coil voltage is 1500V. Eight sets of "匚"-shaped yokes are used to uniformly distribute the coil around the coil. The other parts of the embodiment 3 are the same as those of the embodiment 1.

 Through the above three embodiments, it can be obtained that in the induction heating process of the ingot induction heating and the electromagnetic stirring device of the embodiment of the invention, the heat is the volumetric heat directly generated by the molten metal in the "hot vortex penetration depth", The heating volume is large and the thermal efficiency is high. The induction coil is used to inductively heat the riser steel, compensate the heat loss of the riser during the solidification process of the steel ingot, prolong the solidification time of the riser molten steel, and ensure that the riser has enough molten steel to replenish the ingot of the steel ingot, which is beneficial to reduce The proportion of risers increases the utilization rate of steel ingots.

 In addition, since the electromagnetic stirring force in the molten steel is inversely proportional to the square root of the power supply frequency, the lower the frequency, the greater the stirring force. Therefore, the power frequency is used to form a large electromagnetic stirring force to accelerate and change the motion state of the melt. Conducive to the high temperature melt in the central region to wash the crystallization front, promote the remelting of the crystallization front dendrites, on the other hand, the electromagnetic stirring force produces mechanical shearing force on the growing dendrites, causing the dendrites to break, thus preventing the branches The crystal arms are interlaced and bridged to ensure the smoothness of the feeding channels, effectively eliminating the formation of secondary shrinkage holes. Induction heating is used to reduce the temperature drop of the riser molten steel, which provides favorable temperature conditions for the inclusions to float. At the same time, the invention uses an induction coil to connect to the three-phase power frequency power supply, and after the power is turned on, the coil is formed. In the magnetic field, the molten steel generates electromagnetic stirring effect under the action of the magnetic field, so that the molten metal in the center of the riser moves upward, and the metal liquid moves downward to form an overall circulation, which is driven by the upward flow of the molten steel in the center to promote the melt. The gas and inclusion particles are fully floated, reducing inclusions in the molten steel and improving the quality of the ingot. In the power supply cabinet of the invention, an intermediate frequency thyristor power supply can also be used, and the single-phase winding coil is connected to the intermediate frequency thyristor power supply through a water-cooled cable, and the current frequency is 100 Hz-5000 Hz. The power and frequency input to the electromagnetic induction coil are conveniently adjusted by the intermediate frequency thyristor power supply, and are adapted to the riser heating and insulation of different tonnage steel ingots.

Claims

Claim 1. A steel ingot induction heating and electromagnetic stirring device, comprising a base (3), a support arm (4), an induction coil (5a, 5b, 5c), a thermocouple (11) and a recorder (12), The outer surface of the side wall of the base (3) is symmetrically arranged with a lifting lug (6);  The base (3) is built with a refractory insulating material as a riser sleeve (2), and the riser sleeve (2) is placed vertically outside the induction coil (5a, 5b, 5c), the induction coil (5a, 5b, 5c) connected to the power cabinet (7) by a water-cooled cable, and a yoke (10) is circumferentially distributed outside the induction coils (5a, 5b, 5c), the yoke (10) The outer side is clamped and fastened using a stainless steel plate that is fixed to the support arm (4), the support arm (4) is fixed in the recess of the base (3), and the cooling water system (9) The induction coils (5a, 5b, 5c) are connected to the induction coils (5a, 5b, 5c), and the induction coils (5a, 5b, 5c) are cooled by cooling water.  2 . The steel ingot induction heating and electromagnetic stirring device according to claim 1 , wherein: the power supply cabinet ( 7 ) adopts a three-phase power frequency power supply, and the current frequency is 50Ηζ-60Ηζ; or  The power cabinet (7) adopts a thyristor intermediate frequency power supply, and the current frequency is 100 Hz-5000 Hz.  3. The steel ingot induction heating and electromagnetic stirring device according to claim 2, wherein: when the power supply cabinet (7) adopts a three-phase power frequency power supply:  The induction coils (5a, 5b) and the three-phase power frequency power supply are connected by three-phase six-group or two-phase four-group connection.  The steel ingot induction heating and electromagnetic stirring device according to claim 3, wherein: when a three-phase six-group connection method is adopted, the induction coil (5a) is vertically placed in the six sets of induction coils. Riser insulation sleeve (2) externally, each of the six sets of induction coils are connected in series, specifically from the top of the riser downward, the first set of coils and the fourth set of coils are connected in series, the second set of coils and the fifth The group of series coils, the third group of coils and the sixth group of coils are connected in series, and then respectively connected to each phase of the three-phase power frequency power supply cabinet, and the six groups of induction coils are connected by three-phase six-group coil connection; or  When two-phase four-group connection is adopted, the induction coil (5b) is vertically placed outside the riser sleeve (2) by four sets of induction coils, and each two sets of coils are connected in series, specifically from the top of the riser. The first group of coils and the third group are connected in series, and the second group of coils and the fourth group are connected in series, and connected to the power cabinet (7) through the water-cooled cable by using a "T" connection method, the four groups of inductions The wiring of the coil adopts two-phase four-group coil connection. The steel ingot induction heating and electromagnetic stirring device according to claim 2, wherein: when the power cabinet (7) adopts a thyristor intermediate frequency power supply: The induction coil (5c) is placed in the outer vertical direction of the riser sleeve (2), and is connected to the power cabinet (7) through a water-cooled cable.  The steel ingot induction heating and electromagnetic stirring device according to claim 1, wherein: the induction coils (5a, 5b, 5c) have the same structure, and are spirally formed by a special-shaped cross section or a rectangular cross section pure copper tube. The tube wall near the riser side has a thickness of 2 mm to 50 mm, and the outer surface of the induction coil (5a, 5b, 5c) is covered with a mica tape and coated with an insulating varnish.  7 . The steel ingot induction heating and electromagnetic stirring device according to claim 1 , wherein: the yoke ( 10 ) is formed by stacking silicon steel sheets, and the cover stainless steel plate and the silicon steel sheet are in contact with the mica board. Separated, the yoke (10) is evenly distributed around the induction coils (5a, 5b, 5c) in the circumferential direction, the yoke (10) and the induction coils (5a, 5b, 5c) Use a mica board to tighten between them to reduce coil vibration and avoid damage to the insulation of the induction coil.  The steel ingot induction heating and electromagnetic stirring device according to claim 1, wherein: the base (3) is made of stainless steel, and between the yoke (10) and the base (3) A gap is left and a thermally insulating material is filled between the gaps.  The ingot induction heating and electromagnetic stirring device according to claim 1, wherein: the riser sleeve (2) is assembled from a refractory brick and a heat insulating plate and fixed on the base (3) The riser sleeve (2) has a wall thickness of 20 mm to 200 mm, and has no ferromagnetic material between the induction coils (5a, 5b, 5c).  The steel ingot induction heating and electromagnetic stirring device according to claim 1, wherein: the thermocouple (11) is wrapped in a corundum protection tube, inserted into a metal liquid of a riser, and connected by a wire. The recorder (12) records the temperature of the riser molten steel, is used to feedback the cooling process of the riser molten steel, and adjusts the input power of the power supply according to the feedback information of the recorder (12) to control the riser solidification process.  The steel ingot induction heating and electromagnetic stirring device according to claim 1, wherein: the cooling water system (9) supplies cooling water to the induction coils (5a, 5b, 5c) at the water outlet A temperature measuring device is provided for measuring the temperature of the water.