CN209664258U - A kind of solenoid type magnetic stirrer - Google Patents

Abstract

The utility model discloses a solenoid type electromagnetic stirrer, which comprises: a shell, a solenoid coil, a crucible, a resistance wire heating unit and a heat insulating layer; a coil support wall is arranged inside the shell, and the solenoid coil is wound on the coil On the support wall, the solenoid coil can provide radial and axial electromagnetic force for the metal melt after being energized; the resistance wire heating unit is used to heat the crucible and maintain the molten state of the metal; the heat insulation layer is used to isolate high temperature and protect the spiral Tube Coil. In the utility model, solenoid coils of different numbers and positions can produce different radial and axial electromagnetic force distributions, wherein the typical force field distribution is that the radial electromagnetic force is unevenly distributed along the axial direction, making the metal melt The turbulent motion of the "double loop" trajectory is greatly improved compared with the traditional electromagnetic stirring, which increases the disorder of the melt motion, so the stirring efficiency of the solenoid electromagnetic stirrer is greatly improved compared with the traditional electromagnetic stirrer.

Description

A solenoid type electromagnetic stirrer

technical field

The utility model belongs to the field of electromagnetic casting, and more specifically relates to a solenoid type electromagnetic stirrer.

Background technique

With the rapid development of science and technology and manufacturing, a single metal material is difficult to meet the design requirements of the industry, so the development of composite materials with excellent properties of multiple materials has become one of the current research hotspots. Among them, particle-reinforced metal matrix composites have been widely used in various fields such as aviation, aerospace, and automobiles due to their simple preparation, superior performance, and low cost. The mechanical stirring method stirs the metal melt added with reinforced particles by rotating paddles to fully mix the reinforced particles with the metal melt. It is the most mature method for preparing particle-reinforced metal matrix composites. Impurities, uneven stirring force, and strict requirements on the high temperature resistance of the stirring paddle material, etc., and the electromagnetic stirring technology has the advantages of non-contact, no stirring blind area, not easy to bring in impurities, and improved metal microstructure. The field has great application prospects. At present, the traditional electromagnetic stirring technology mainly has three different stirring forms: (1) the rotating magnetic field type, the metal melt is rotated by the circumferential electromagnetic force under the action of the rotating magnetic field; (2) the traveling wave magnetic field type, the metal melt is in the Under the action of the traveling wave magnetic field, it is moved in a straight line by the electromagnetic force with the same direction; (3) The spiral magnetic field type, that is, the rotating magnetic field and the traveling wave magnetic field are superimposed, and the metal melt is simultaneously subjected to circumferential force and axial force under the action of the spiral magnetic field. Instead, do a spiral upward or downward movement. The utility model patents with publication numbers CN107116191A and CN103182495A respectively point out that the composite spiral electromagnetic stirrer can produce the above three different stirring modes under different working modes. However, the traditional electromagnetic stirring still has the following defects: (1) The mixing efficiency is not high, and the stirring electromagnetic force has no radial component, which makes the flow turbulence of the metal melt less, which is not conducive to the internal heat transfer of the metal melt and the interaction between the metal melt and the reinforcing particles. Mixing; (2) The stirring speed is constrained by the skin effect of the electromagnetic force. To increase the flow rate of the metal melt, the frequency of the working current needs to be increased, and the increase in frequency makes the electromagnetic force on the melt mainly distributed in the melt near the winding area, the central area Almost not subject to electromagnetic force; (3) The circumferential rotation of the metal melt forms a large central vortex on the liquid surface, which is easy to cause particles to agglomerate in the casting of particle-reinforced metal matrix composites and reduce the performance of the composite material; (4) Electromagnetic The agitator has many windings, complex structure and difficult maintenance.

Utility model content

Aiming at the defects of the prior art, the purpose of this utility model is to provide a solenoid type electromagnetic stirrer, aiming to solve the single stirring form and the turbulence of the molten metal flow in the casting of particle reinforced metal matrix composite materials in the prior art. Minor technical problems leading to poor and inefficient mixing of metal melt and reinforcing particles.

The utility model provides a solenoid type electromagnetic stirrer, comprising: a shell, a solenoid coil, a crucible, a resistance wire heating unit and a heat insulating layer; a coil support wall is arranged inside the shell, and the solenoid A coil is wound on the coil support wall, and the solenoid coil can provide radial and axial electromagnetic forces after being energized; the resistance wire heating unit is used to heat the crucible and maintain the molten state of the metal; the The thermal insulation layer is used to insulate high temperature and protect the solenoid coil.

Wherein, when working, the magnetic field generated by the solenoid coil at its height center is greater than the magnetic field at both ends, the electromagnetic force in the middle of the molten metal is greater than the electromagnetic force at the two ends, and the molten metal will generate an inward flow motion. Trend, the entire melt forms a "dual-circuit" flow trajectory in which the middle part flows radially inward and both ends flow outward. This "dual-circuit" turbulent flow motion similar to mechanical stirring can efficiently stir the entire melt.

As an embodiment of the present invention, when the solenoid coil is a single coil, it is wound on the coil supporting wall; the magnetic field generated by the solenoid coil is slightly smaller at the largest two ends in the middle of the coil, and the crucible melts The electromagnetic force received by the metal at the same time also presents a distribution characteristic that the middle part is large and the two ends are small.

As an embodiment of the present invention, when the solenoid coil is a single coil, it is arranged at the lower end of the outer side of the molten metal. When working, the electromagnetic force received by the lower end of the molten metal is relatively large, and the electromagnetic force received by the upper end is relatively small. , the metal melt at the lower end flows inward along the radial direction and the metal melt at the upper end flows outward. The metal melt forms an overall circulation loop, and the flow form is turbulent flow.

As an embodiment of the present invention, when the solenoid coil is a single coil, it is arranged at the upper end outside the molten metal, and when working, the electromagnetic force received by the upper end of the molten metal is relatively large, and the electromagnetic force received by the lower end is relatively small , the upper metal melt flows inward and the lower metal melt flows outward, the metal melt forms an overall circulation loop, and the flow form is turbulent flow.

As another embodiment of the present invention, when the solenoid coil has two coils, the two coils are respectively arranged at the upper end and the lower end outside the metal melt, and are distributed symmetrically about the height center of the crucible.

As another embodiment of the present invention, when the solenoid coil has two coils, the two coils are respectively arranged at the upper end and the lower end outside the metal melt, and are distributed asymmetrically with respect to the height center of the crucible.

Wherein, the solenoid coil is a solid copper wire or a hollow copper tube. When a hollow copper tube is used, water can be passed through the tube to further improve the heat dissipation performance of the coil.

In the embodiment of the present invention, the solenoid electromagnetic stirrer further includes: a frequency converter and a power supply, one end of the frequency converter is connected to the solenoid coil, and the other end of the frequency converter is connected to the power supply, so The frequency converter can arbitrarily change the frequency of the current passing through the solenoid coil between 0 and 100 Hz, and the power supply can arbitrarily change the effective value of the current passing through the solenoid coil between 0 and 400 A.

In the embodiment of the utility model, the resistance wire heating unit includes: a resistance wire, a thermocouple and a temperature adjustment circuit; the resistance wire is used to heat the crucible, and the thermocouple is used to detect the temperature of the crucible and feed back the temperature to the temperature adjustment circuit , the temperature regulation circuit keeps the temperature of the crucible at the temperature set by the user according to the feedback from the thermocouple.

The utility model has the following technical effects:

(1) Stirring efficiency is high. Because the solenoid coil generates radial and axial electromagnetic forces, and the radial electromagnetic force is unevenly distributed along the axial direction, the metal melt forms a flow circuit similar to mechanical stirring, and the movement form is turbulent flow, which is much more turbulent than traditional electromagnetic stirring. Improvement, increasing the disorder of the metal melt movement, so the stirring efficiency of the solenoid electromagnetic stirrer is greatly improved compared with the traditional electromagnetic stirrer, and it also has non-contact, no stirring blind area, is not easy to bring in impurities, and improves Advantages of traditional electromagnetic stirring such as metal microstructure.

(2) The control is simple and the mixing forms are diversified. Electromagnetic forces with different distribution characteristics can be generated only by changing the position and combination of the solenoid. Therefore, different stirring forms can be customized according to the metal melt to be stirred or the metal melt containing reinforced particles with different physical properties. It is suitable for metal connection Casting, particle reinforced metal matrix composite casting, semi-solid casting and other scenarios.

(3) Reduce the limitation of the improvement of the current frequency on the stirring effect. When the current frequency increases, the electromagnetic force increases, but due to the skin effect, the electromagnetic force is mainly distributed on the outside of the metal melt, and the internal electromagnetic stirring force is small, and the solenoid electromagnetic stirrer is applied to the metal melt. The electromagnetic force is dominated by radial force, and the molten metal will generate a radial velocity and circulate between the outside and the inside, reducing the influence of the small stirring force inside the molten metal.

(4) During the stirring process, no central vortex is formed on the liquid surface of the metal melt, so in the casting of particle-reinforced metal matrix composites, the reinforcement particles will not be agglomerated near the liquid surface.

(5) The main structure of the magnetic field generating device is a solenoid coil, which is simple in structure, small in size, stable in performance and long in life.

Description of drawings

Fig. 1 is the structural representation of the solenoid type electromagnetic stirrer that the utility model embodiment provides;

Fig. 2 is the magnetic induction line schematic diagram of the magnetic field that solenoid coil produces;

Figure 3(a) is a schematic diagram of the phase relationship of the magnetic field, induced electric field, induced current and electromagnetic force in a metal melt;

Figure 3(b) is a schematic diagram of a typical force field and flow field of a solenoid electromagnetic stirrer;

Fig. 4 (a) is the sectional view of the flow field under the single coil mode stirring of the solenoid type electromagnetic stirrer;

Figure 4(b) is a cross-sectional view of the flow field stirred by a traditional mechanical stirrer;

Fig. 5 is a structural diagram and a cross-sectional view of the flow field of the first embodiment of the utility model;

Fig. 6 is a structural diagram and a cross-sectional view of the flow field of the second embodiment of the utility model;

Fig. 7 is a structural diagram and a cross-sectional view of the flow field of the third embodiment of the utility model;

Fig. 8 is a structural diagram and a cross-sectional view of the flow field of the fourth embodiment of the utility model;

Fig. 9 is a structural diagram and a cross-sectional view of a flow field of a fifth embodiment of the present invention.

In the figure, 1 is the housing, 2 is the upper cover of the housing, 3 is the solenoid coil, 4 is the crucible, 5 is the heating resistance wire, 6 is the heat insulation layer, and 7 is the metal melt (metal liquid).

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The utility model is applied to the fields of electromagnetic casting and material electromagnetic processing, and is especially aimed at the electromagnetic stirrer used in metal continuous casting, semi-solid casting and particle-reinforced metal matrix composite material casting. The utility model provides a solenoid type agitator with simple structure, long working life, various stirring forms and high stirring efficiency, which can drive the metal melt to do turbulent movement, realize stirring the metal melt or combine the metal melt with the Solid particles are mixed quickly and evenly.

The solenoid agitator provided by the utility model includes: a shell, a shell upper cover, a solenoid coil, a crucible, a resistance wire heating unit and a heat insulating layer; the shell plays the role of support, isolation and protection; The cover plays the role of isolation and protection; the solenoid coil is wound on the coil support wall inside the shell; the crucible is surrounded by a resistance wire and used as a container; the resistance wire heating unit heats the crucible and keeps the metal in a molten state; The heat insulating layer is located outside the resistance wire, and its function is to protect the solenoid coil and isolate the high temperature of the resistance wire.

In the embodiment of the utility model, the solenoid coil has two forms of single and multiple combinations. A single solenoid coil can generate stronger electromagnetic force in the middle of the coil and weaker at both ends, which is suitable for metal continuous casting; multiple solenoid coils can be combined in different numbers and positions to generate electromagnetic stirring forces with different distributions, and the combination form It can be changed according to different usage scenarios, metal substrates and reinforcing particles with different physical properties.

In the embodiment of the utility model, the solenoid coil is connected to the frequency converter and the power supply, and the power supply provides electric energy for the frequency converter and the coil, and the effective value of the current passing through the solenoid coil can be arbitrarily changed between 0 and 400A. The frequency of the current passing through the coil can be changed arbitrarily between 0 and 100Hz. According to the principle of electromagnetic induction, the current amplitude remains unchanged. The higher the frequency, the greater the electromagnetic stirring force generated, but due to the skin effect, the area where the electromagnetic force acts It is also smaller, although the solenoid type electromagnetic stirrer provided by the utility model can provide radial electromagnetic force to reduce the limitation of the current frequency and increase the stirring effect, but it is not enough to completely offset, and the metal melt with different physical characteristics and enhanced When the particles are stirred, they correspond to different optimal current frequencies and sizes. The frequency converter and power supply enable the utility model to achieve the optimal current frequency and size in different usage scenarios.

The shape of the solenoid coil is not limited to solid copper wires, and the way of passing water through hollow copper tubes can be used to further improve its heat dissipation capacity.

In the embodiment of the utility model, the resistance wire heating unit is composed of a resistance wire, a thermocouple and a temperature regulating circuit. The resistance wire is used to heat the crucible, and the thermocouple is used to detect the temperature of the crucible and feed back the temperature to the temperature regulation circuit. The temperature regulation circuit can keep the temperature of the crucible at the temperature set by the user according to the feedback of the thermocouple.

In the utility model, the energized solenoid coil generates an alternating magnetic field B, as shown in Figure 2, the magnetic field is composed of a radial component and an axial component, and the magnetic field excites an induced electric field E in the metal melt, according to the electromagnetic induction The law shows that the phase of the induced electric field E lags behind the alternating magnetic field Since the metal melt is an inductive load, the phase of the induced current density J in the melt will lag behind the induced electric field According to the formula of Ampere's force, the electromagnetic force per unit volume of molten metal is Since the magnetic field has radial and axial components, the molten metal is subjected to axial and radial electromagnetic forces. The axial electromagnetic force can speed up the movement of the metal melt in the axial direction, and increase the speed and disorder of the melt movement. For the radial electromagnetic force, due to the influence of the lagging phase α of the current density, the time and value of the radially inward electromagnetic force on the metal melt in one electrification cycle are greater than the radially outward electromagnetic force ( That is, t ₂ >t ₁ in Figure 3(a), ), so the metal melt has an inward flow movement trend, and as the working time increases, the flow rate of the metal melt continues to increase until the movement resistance and electromagnetic force reach a dynamic balance.

Because the magnetic field generated by the solenoid coil at the center of its height is greater than that at both ends, the electromagnetic force in the middle of the molten metal is greater than that at both ends. According to the above analysis, it is known that the molten metal will generate inward flow movement Trend, due to the conservation of the mass of the metal melt, the final melt will form a "double loop" flow trajectory with the middle flowing inward and the two ends flowing outward. This "dual loop" turbulent movement similar to mechanical stirring can efficiently control the entire The melt is stirred. Therefore, the solenoid type electromagnetic stirrer provided by the utility model has the advantages of both the mechanical stirrer and the traditional electromagnetic stirrer.

In order to further illustrate the solenoid type electromagnetic stirrer provided by the embodiment of the present utility model, it is described in detail as follows with reference to the accompanying drawings and in conjunction with specific examples:

First embodiment:

As shown in Figure 1, the solenoid agitator provided by the utility model includes: a housing 1, a housing upper cover 2, a solenoid coil 3, a crucible 4, a resistance wire heating unit 5 and an insulating layer 6; 1 plays the role of support, isolation and protection; the upper cover of the shell 2 plays the role of isolation and protection; the solenoid coil 3 is wound on the inner coil support wall of the shell 1, and its height is slightly smaller than that of the crucible 4; the crucible 4 is surrounded by resistance wires, As a stirring vessel; resistance wire heating unit 5 is made up of resistance wire, thermocouple and temperature regulation circuit (not drawn in thermocouple and temperature regulation circuit figure), resistance wire is used for heating crucible and keeps the molten state of metal, and thermocouple is used for Detect the temperature of the crucible and feed back the temperature to the temperature adjustment circuit. The temperature adjustment circuit can keep the temperature of the crucible at the temperature set by the user according to the feedback of the thermocouple; the heat insulation layer 6 is located outside the resistance wire, and its function is to protect the solenoid coil and isolate the resistance. When the metal melting temperature is low, silica aerogel can be used as the insulation layer material. When the metal melting temperature is high, the hollow copper layer can be used for heat insulation by water cooling.

As shown in FIG. 5 , the stirrer coil is composed of a single solenoid coil 3 . Since the magnetic field generated by the solenoid coil 3 is the largest in the middle of the coil and slightly smaller at both ends, the electromagnetic force received by the molten metal 7 in the crucible at the same time is also distributed in a large middle part and small at both ends. As shown in Figure 2, during one energization period of the solenoid coil 3, the coil 3 generates an alternating magnetic field B, which is composed of a radial component and an axial component, and this magnetic field excites an induced electric field in the metal melt 7 E, according to the law of electromagnetic induction, the phase of the induced electric field E lags behind the alternating magnetic field Since the metal melt 7 is an inductive load, the phase of the induced current density J in the melt will lag behind the induced electric field According to the formula of Ampere's force, the electromagnetic force per unit volume of molten metal is Since the magnetic field has radial and axial components, the molten metal is subjected to axial and radial electromagnetic forces. The axial electromagnetic force can speed up the movement of the metal melt in the axial direction, and increase the speed and disorder of the melt movement. For the radial electromagnetic force, the lagging phase α of the current density will cause the metal melt 7 to be subjected to the radially inward electromagnetic force for a period of time and the value is greater than the radially outward electromagnetic force, as shown in the figure 3(a), t ₂ >t ₁ , (Take the radial outward as the positive direction), and because of the magnetic field distribution characteristics of the large and small ends of the solenoid coil 3 and the conservation of the mass of the molten metal, the molten metal in the middle will flow inward, and the molten metal at both ends will flow outward Flow, forming a complete circular trajectory, as the working time increases, the flow rate of the molten metal continues to increase until the movement resistance and electromagnetic force reach a dynamic balance.

As shown in Figure 4(a), the metal melt in the middle is moved inward by the electromagnetic force to the vicinity of the axis and then flows upward and downward. shown) can efficiently stir the entire melt. Therefore, the solenoid type electromagnetic stirrer provided by the utility model has the advantages of both the mechanical stirrer and the traditional electromagnetic stirrer.

This embodiment is suitable for metal continuous casting, semi-solid casting, etc., and is especially suitable for particle-reinforced metal matrix composite casting. The core step of the particle-reinforced metal matrix composite casting is the mixing of metal melt and reinforcing solid particles. The reinforcing particles are sinking solid particles with a density slightly larger than the metal matrix. The particles will sink at a slower speed in static state Shen. In this embodiment, the particles located in the upper half of the molten metal 7 are subjected to the force of the upward circulation of the fluid, preventing them from sinking; the particles located in the lower half of the molten metal 7 are subjected to the force of the downward circulation of the fluid, Accelerate the sinking first, and then move to the middle of the molten metal 7 through circular movement. The circulation of the entire fluid makes the reinforcing particles with a density slightly larger than the metal matrix evenly distributed in the molten metal 7 .

Second embodiment:

The difference between this embodiment and the first embodiment is that the present embodiment adopts two solenoid coils 3-1 and 3-2, and the two solenoid coils 3-1 and 3-2 have more coil turns than the first embodiment. The number is reduced, so the height is reduced, and a set of power supply and frequency converter are connected separately.

As shown in Figure 6, the two solenoid coils 3-1 and 3-2 are respectively located at the upper end and the lower end of the outer side of the metal melt 7, and are symmetrically distributed about the height of the crucible 4, since the magnetic field is mainly concentrated on the solenoid coil 3 The vicinity of -1 and 3-2, so the electromagnetic force received by the two ends of the metal melt 7 is relatively large, and the electromagnetic force received by the middle part is small. The metal melt at both ends flows inward, while the middle metal melt flows outward, and the metal The melt forms an integral circulation loop, the flow form is turbulent flow, and the circulation direction is opposite to that of the first embodiment.

This embodiment is suitable for metal continuous casting, semi-solid casting, etc., and is especially suitable for particle-reinforced metal matrix composite casting. The core step of the particle-reinforced metal matrix composite casting is the mixing of metal melt and reinforcing solid particles. The reinforcing particles are floating solid particles with a density slightly smaller than that of the metal matrix, and the particles will float at a slower speed when static. In this embodiment, the particles located in the upper half of the molten metal 7 are subjected to the force of the fluid’s downward circulation movement, preventing them from floating up; Accelerated floating to the middle of the metal melt 7, and then to the bottom of the metal melt 7 through circular motion, the circulation of the entire fluid makes the reinforcement particles with a density slightly smaller than the metal matrix evenly distributed in the metal melt 7.

Third embodiment:

The difference between this embodiment and the first embodiment is that this embodiment adopts the lower end of the solenoid coil 3 located outside the metal melt 7 , and the number of turns of the solenoid coil 3 is reduced compared with the first embodiment, so the height is reduced. The solenoid coil 3 is connected with a power supply and a frequency converter.

As shown in Figure 7, the solenoid coil 3 is located at the lower end of the outer side of the metal melt 7. Since the magnetic field is mainly concentrated in the vicinity of the solenoid coil 3, the electromagnetic force received by the lower end of the metal melt is relatively large, and the electromagnetic force received by the upper end is larger. Smaller, the molten metal at the lower end flows inwards and the molten metal at the upper end flows outwards, the molten metals form an overall circulation loop, the flow form is turbulent, and the circulation direction is opposite to that of the fourth embodiment.

This embodiment is suitable for metal continuous casting, semi-solid casting, etc., and is especially suitable for particle-reinforced metal matrix composite casting. The core step of the particle-reinforced metal matrix composite casting is the mixing of metal melt and reinforcing solid particles. The reinforcing particles are sinking solid particles that are denser than the metal matrix and can sink at a faster rate in static state. . In this embodiment, the upward flow of the molten metal 7 drives the particles to move toward the liquid surface of the molten metal, and the sinking reinforcing particles are evenly distributed in the molten metal 7 through circulating flow.

Fourth embodiment:

The difference between this embodiment and the third embodiment is that this embodiment uses the upper end of the solenoid coil 3 located outside the molten metal 7 . The solenoid coil 3 is connected with a power supply and a frequency converter.

As shown in Figure 8, the solenoid coil 3 is located at the upper end of the outer side of the metal melt 7. Since the magnetic field is mainly concentrated in the vicinity of the solenoid coil 3, the electromagnetic force received by the upper end of the metal melt is relatively large, and the electromagnetic force received by the lower end is relatively large. Smaller, the upper metal melt flows inward and the lower metal melt flows outward, the metal melt forms an overall circulation loop, and the flow form is turbulent flow.

This embodiment is suitable for metal continuous casting, semi-solid casting, etc., and is especially suitable for particle-reinforced metal matrix composite casting. The core step of the casting of particle-reinforced metal matrix composites is the mixing of metal melt and reinforcing solid particles. The reinforcing particles are floating solid particles with a density smaller than that of the metal matrix and which can float faster in static state. In this embodiment, the downward flow of the metal melt 7 drives the particles to move to the bottom of the crucible, and the floating reinforcement particles are uniformly distributed in the metal melt 7 through circulating flow.

Fifth embodiment:

The difference between this embodiment and the second embodiment is that the two solenoid coils 3-1 and 3-2 used in this embodiment are distributed asymmetrically about the height center of the crucible 4 in the height direction, and the two solenoid coils 3 -1 and 3-2 respectively connect a set of power supply and frequency converter.

As shown in Figure 9, the two solenoid coils 3-1 and 3-2 are respectively located at the upper end and the lower end of the outer side of the metal melt 7, and are asymmetrically distributed with respect to the height center of the crucible 4, and the lower end coil 3-2 is 4 heights away from the crucible Center is closer. Because the magnetic field is mainly concentrated in the vicinity of the solenoid coils 3-1 and 3-2, the electromagnetic force received by the two ends of the molten metal 7 is relatively large, and the electromagnetic force received by the area between the coils 3-1 and 3-2 is relatively large. Small, the metal melt at both ends flows inward, converges at the height center of the coils 3-1 and 3-2 and flows outward, the metal melt forms an overall circulation loop, the flow form is turbulent flow, and the circulation direction is the same as that of the first implementation Examples are similar.

This embodiment is suitable for metal continuous casting, semi-solid casting, etc., and is especially suitable for particle-reinforced metal matrix composite casting. The core step of the particle-reinforced metal matrix composite casting is the mixing of molten metal and reinforcing solid particles, and the density of sinking reinforcing particles applicable to this embodiment is between the first embodiment and the third embodiment.

In addition to the above-mentioned embodiments, the solenoid coil 3 can have different numbers and combinations of positions to meet the requirements of various flow forms, and can be specifically matched according to different usage scenarios, metal substrates and reinforcing particles with different physical characteristics.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and modifications made within the spirit and principles of the utility model Improvements and the like should all be included within the protection scope of the present utility model.

Claims (9)

1. A solenoid type electromagnetic stirrer, is characterized in that, comprises: housing, solenoid coil, crucible, resistance wire heating unit and insulation layer; The housing is provided with a coil support wall, the solenoid coil is wound on the coil support wall, and the solenoid coil can provide radial and axial electromagnetic forces after being energized; The resistance wire heating unit is used to heat the crucible and keep the metal in a molten state; the heat insulation layer is used to insulate high temperature and protect the solenoid coil; When working, the magnetic field generated by the solenoid coil at the center of its height is greater than that at both ends, the electromagnetic force on the middle of the molten metal is greater than that at both ends, and the molten metal will flow radially inward Trend, the melt forms a "dual-loop" flow track in which the middle flows inward and both ends flow outward. This "dual-loop" turbulent movement similar to mechanical stirring can efficiently stir the entire melt. 2. solenoid type electromagnetic stirrer as claimed in claim 1, is characterized in that, when solenoid coil is single coil, it is wound on the described coil support wall, and the magnetic field that described solenoid coil produces It is the largest in the middle of the coil and slightly smaller at both ends, and the electromagnetic force received by the molten metal in the crucible at the same time is also distributed in a distribution that is larger in the middle and smaller at both ends. 3. solenoid type electromagnetic stirrer as claimed in claim 1, is characterized in that, when the solenoid coil is a single coil, it is arranged on the lower end outside the molten metal, during work, the lower end of the molten metal is subjected to The electromagnetic force is relatively large, and the electromagnetic force received by the upper end is smaller. The molten metal at the lower end flows radially inward and the molten metal at the upper end flows outward. The molten metal forms a whole circulation loop, and the flow form is turbulent flow. 4. solenoid type electromagnetic stirrer as claimed in claim 1 is characterized in that, when the solenoid coil is a single coil, it is arranged on the upper end outside the molten metal, and during work, the upper end of the molten metal is subjected to The electromagnetic force is relatively large, and the electromagnetic force received by the lower end is relatively small. The molten metal at the upper end flows radially inward and the molten metal at the lower end flows outward. The molten metal forms an overall circulation loop, and the flow form is turbulent. 5. The solenoid type electromagnetic stirrer as claimed in claim 1, wherein, when the solenoid coil is two coils, the two coils are respectively arranged on the upper end and the lower end outside the molten metal, and about the crucible The height of the central symmetric distribution. 6. The solenoid type electromagnetic stirrer as claimed in claim 1, wherein, when the solenoid coil is two coils, the two coils are respectively arranged on the upper end and the lower end outside the molten metal, and about the crucible The height of the central asymmetric distribution. 7. The solenoid type electromagnetic stirrer according to any one of claims 1-6, wherein the solenoid coil is a solid copper wire or a hollow copper tube. 8. The solenoid type electromagnetic stirrer according to any one of claims 1-6, wherein the solenoid type electromagnetic stirrer also comprises: a frequency converter and a power supply, and one end of the frequency converter is connected to For the solenoid coil, the other end of the frequency converter is connected to the power supply, and the frequency converter can arbitrarily change the frequency of the current passing through the solenoid coil between 0 and 100 Hz, and the power supply can be between 0 and 100 Hz. The effective value of the current passed through the solenoid coil can be changed arbitrarily between 400A and 400A. 9. The solenoid type electromagnetic stirrer according to any one of claims 1-6, wherein the resistance wire heating unit comprises: resistance wire, thermocouple and temperature regulating circuit; The resistance wire is used to heat the crucible, and the thermocouple is used to detect the temperature of the crucible and feed back the temperature to the temperature regulation circuit, and the temperature regulation circuit keeps the temperature of the crucible at the temperature set by the user according to the feedback from the thermocouple.