CN209322988U - A Solenoid Electromagnetic Stirrer with Control Ring - Google Patents

Abstract

The utility model provides a kind of solenoid type magnetic stirrer with control ring, comprising: control ring, shell, solenoid coil, crucible, Resistant heating unit and heat insulation layer；Coil support wall is provided in shell, solenoid coil is wrapped on coil support wall, and solenoid coil can provide radial and axial electromagnetic force after being powered for metal bath；Resistant heating unit is used to heat and keep the molten condition of metal bath for crucible；Heat insulation layer is for completely cutting off high temperature protection solenoid coil；Control ring can be divided into enhanced and weakening property, for controlling different agitating modes between heat insulation layer and inner walls.In the utility model, control ring can control solenoid coil to generate different radial and axial distribution of electromagnetic force, so that metal bath is flowed with turbulence form, the more traditional electromagnetic agitation of turbulence greatly improves, the randomness of bath movement is increased, therefore the more traditional magnetic stirrer of stirring efficiency of solenoid type magnetic stirrer obtains larger raising.

Description

A Solenoid Electromagnetic Stirrer with Control Ring

technical field

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

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 compound 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 with a control ring, aiming to solve the problem of single stirring form and metal melting in the casting of particle-reinforced metal matrix composite materials in the prior art. The small flow turbulence of the body leads to poor mixing effect and low efficiency of the metal melt and the reinforcing particles.

The utility model provides a solenoid type electromagnetic stirrer to be controlled, which comprises: a control ring, a shell, a solenoid coil, a crucible, a resistance wire heating unit and a heat insulating layer; the shell 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 and maintain the crucible The melting state of the metal melt; the heat insulation layer is used to insulate high temperature and protect the solenoid coil; the control ring is located between the heat insulation layer and the inner wall of the shell, and is used to control different stirring modes.

Wherein, the control loop can be divided into enhanced type and weakened type. The enhanced control ring is a ring made of high-conductivity and low-permeability materials, such as pure copper, which has good conductivity, but poor magnetic permeability, and the secondary magnetic field can be excited under the energized solenoid coil, so It can enhance the electromagnetic stirring force of the metal melt near the control ring, so that the metal melt in this area flows radially inward; the weakened control ring is a ring made of high magnetic permeability and low electrical conductivity materials, such as laminated silicon steel sheets, etc. , has good magnetic permeability and weakens the magnetic field near the control ring, but its ability to generate induced current and excite the secondary magnetic field is weak, so it can weaken the electromagnetic stirring force of the metal melt near the control ring, so that the metal melt in this area along the flow radially outward.

Among them, when working, the enhanced control ring can increase the magnetic field in the vicinity of the same height, so that the spatial magnetic field in the crucible is unevenly distributed in the axial direction, and the metal in the vicinity of the same height as the control ring The average electromagnetic force suffered by the melt is greater than that of other areas, so the metal melt in the area near the same height as the control ring will flow radially inward, and the melt in other areas will move outward, and the entire melt will form a " "Double-circuit" flow trajectory, this kind of "double-circuit" turbulent flow movement similar to mechanical stirring can efficiently stir the entire melt.

As an embodiment of the present invention, when the control ring is reinforced and located outside half the height of the molten metal, the magnetic field jointly generated by the solenoid coil and the control ring is at the middle of the molten metal at a maximum of two The end is slightly smaller, and the electromagnetic force received by the metal melt at the same time is also distributed in a larger middle and smaller ends.

As an embodiment of the present invention, when the control ring is weakened and located outside half the height of the molten metal, the magnetic field generated by the solenoid coil is slightly larger at the smaller ends of the middle of the molten metal , the electromagnetic force received by the metal melt at the same time is also characterized by a smaller middle part and a larger distribution at both ends.

As an embodiment of the present utility model, when the control ring is an enhanced type, it is arranged on the upper end outside the molten metal. When working, the electromagnetic force received by the upper end of the molten metal is larger, and the electromagnetic force received by the lower end is smaller. The molten metal flows inward along the radial direction while the molten metal at the lower end flows outward. The molten metal forms a whole circulation loop, and the flow form is turbulent flow.

As an embodiment of the present invention, when the control ring is weakened, it is arranged on the upper end of the outer side of the metal melt. When working, the electromagnetic force received by the upper end of the metal melt is smaller, and the electromagnetic force received by the lower end is larger. The molten metal flows radially outward while the molten metal at the lower end flows inward. The molten metal forms a whole circulation loop, and the flow form is turbulent flow.

As an embodiment of the present invention, when two control rings are used, one is enhanced and the other is weakened, the enhanced control ring is arranged at the lower end of the outer side of the metal melt, and the weakened control ring is arranged at the lower end of the metal melt. At the upper end of the outer side, when working, the electromagnetic force received by the upper end of the molten metal is reduced compared with that without the control ring, and the electromagnetic force received by the lower end of the molten metal is increased compared with that without the control ring, so the molten metal at the upper end flows radially outward The metal melt at the lower end flows inward, and the metal melt forms an overall circulation loop, and the flow form is turbulent flow.

As an embodiment of the present invention, when the control ring is of the enhanced type, it is arranged between the lower end and the middle part of the outer side of the metal melt. When working, the electromagnetic force received by the metal melt near the height of the control ring is relatively large, and other The electromagnetic force received by the area is small, and the "double loop" flow path formed by the metal melt appears axially asymmetrical, and the flow form is turbulent.

As an embodiment of the present invention, when the control ring is a weakened type, it is arranged between the lower end and the middle part of the outer side of the metal melt. When working, the electromagnetic force received by the metal melt near the height of the control ring is relatively small, and other The area is subjected to a large electromagnetic force, and the "double loop" flow trajectory formed by the metal melt appears axially asymmetrical, and the flow form is turbulent.

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 utility model, the solenoid type electromagnetic stirrer with a control ring 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 The power supply, the frequency converter can arbitrarily change the frequency of the current passing through the solenoid coil between 0 and 100Hz, and the power supply can arbitrarily change the effective value of the current passing through the solenoid coil between 0 and 400A size.

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) Simple control and diversified stirring forms. Electromagnetic forces with different distribution characteristics can be generated only by changing the type, position and combination of the control ring, so 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, suitable for metal Continuous casting, particle reinforced metal matrix composite casting, semi-solid casting and other scenarios.

(2) Reduce the limitation of the increase 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 metal melt generates radial velocity and circulates between the outside and the inside, reducing the influence of the small internal stirring force.

(3) 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. The degree of turbulence is greatly improved compared with the traditional electromagnetic stirring, which increases the disorder of the molten metal 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 and no stirring dead zone , It is not easy to bring in impurities, and the advantages of traditional electromagnetic stirring such as improving the metal microstructure.

(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 structure of the magnetic field generation and control device is a solenoid coil and a control ring, and only one set of power supply device is needed. The structure is simple, the size is small, the performance is stable, and the service life is long.

Description of drawings

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

Figure 2 (a) is a schematic diagram of the magnetic induction lines of the magnetic field generated by the solenoid coil without the influence of the control loop;

Figure 2(b) is a schematic diagram of the magnetic induction lines of the magnetic field generated by the solenoid coil under the influence of the enhanced control loop;

Figure 2(c) is a schematic diagram of the magnetic induction lines of the magnetic field generated by the solenoid coil under the influence of the weakened control loop;

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 the flow field of the fifth embodiment of the present invention;

Fig. 10 is a structural diagram and a cross-sectional view of the flow field of the sixth embodiment of the present invention;

Fig. 11 is a structural diagram and a cross-sectional view of the flow field of the seventh embodiment of the utility model;

In the figure, 1 is the control ring, 2 is the shell, 3 is the upper cover of the shell, 4 is the solenoid coil, 5 is the crucible, 6 is the heating resistance wire, 7 is the heat insulation layer, 8 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 a control ring which is simple in structure, long in working life, diverse in stirring form, high in stirring efficiency and convenient in control, which can drive the metal melt to do turbulent movement and realize the metal melt Stir or mix metal melt with solid particles 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 inner coil support wall of the housing; the crucible is surrounded by resistance wire and used as a container; the resistance wire heating unit heats the crucible and keeps the molten metal State; the heat insulating layer is located outside the resistance wire, and its function is to protect the solenoid coil and isolate the resistance wire from high temperature.

In the embodiment of the utility model, the control rings are divided into enhanced type and weakened type, and the number has two forms: single and multiple combinations. The enhanced control ring produces a larger electromagnetic force in the metal melt near its height, and the weakened control ring produces a smaller electromagnetic force in the metal melt in the vicinity of its height. The combination of positions can generate electromagnetic stirring forces with different distributions, and the combination form 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, when the solenoid agitator does not contain a control ring, the electrified solenoid coil generates an alternating magnetic field B, as shown in Figure 2 (a), the magnetic field is composed of a radial component and an axial component, The magnetic field excites the induced electric field E in the metal melt. 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 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 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, 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.

When the solenoid agitator contains an enhanced control loop, according to the electromagnetic induction effect, the control loop can produce two benefits: 1) The secondary magnetic field excited by the control loop increases the axial magnetic field near it, resulting in The radial electromagnetic force received by the molten metal is greater than the area far away from the control ring. Combined with the above analysis when the solenoid agitator does not contain the control ring, it is known that the molten metal will have an inward flow movement trend. The mass mass is conserved, and finally the melt will form a "dual-loop" flow trajectory in which the area near the enhanced control ring flows inward and other areas flow outward. This "dual-loop" turbulent movement similar to mechanical stirring can efficiently control the The melt is stirred; 2) The secondary magnetic field excited by the control ring increases the radial magnetic field near it, so the axial electromagnetic force received by the metal melt near the control ring is greatly improved, further increasing the flow of the metal melt speed and turbulence.

When the solenoid agitator has a weakened control ring, because the weakened control ring has excellent magnetic permeability, the control ring can have two benefits: 1) The axial magnetic field near the control ring is weakened, resulting in the area near the control ring The electromagnetic force received by the molten metal is smaller than the area far away from the control ring. Combined with the above analysis when the solenoid agitator does not contain the control ring, it is known that the molten metal will have an inward flow movement trend. Due to the quality of the molten metal Conservation, the final melt will form a "dual-loop" flow trajectory in which the area near the weakened control ring flows outward and other areas flow inward. This "dual-loop" turbulent movement similar to mechanical stirring can efficiently control the entire melt Stirring; 2) the control ring increases the radial magnetic field near it, so the axial electromagnetic force received by the metal melt in the vicinity of the control ring is greatly improved, further increasing the speed and turbulence of the metal melt flow.

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 with enhanced control ring provided by the utility model includes an enhanced control ring 1, a housing 2, a housing upper cover 3, a solenoid coil 4, and a crucible 5 , resistance wire heating unit 6, heat insulation layer 7. The enhanced control ring 1 is located between the heat insulation layer and the inner wall of the shell, and its function is to control different stirring methods; the shell 2 plays the role of support, isolation and protection; the upper cover of the shell 3 plays the role of isolation and protection; the solenoid coil 4 Wrapped on the inner coil support wall of the housing 2; the crucible 5 is surrounded by resistance wires as a stirring container; the resistance wire heating unit 6 is composed of resistance wires, thermocouples and temperature regulation circuits (the thermocouples and temperature regulation circuits are not shown in the diagram) , the resistance wire is used to heat the crucible and maintain the melting state of the metal melt, 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 can keep the temperature of the crucible at the temperature set by the user according to the feedback of the thermocouple The thermal insulation layer 7 is located at the outside of the resistance wire, and its function is to protect the solenoid coil and insulate the high temperature of the resistance wire. When the metal melting temperature is low, silica airgel can be used as the insulation layer material. When the metal melting temperature is high A hollow copper layer can be used for thermal insulation by means of water cooling.

As shown in Figure 5, the enhanced control ring 1 is located outside the middle of the molten metal 8. Due to the electromagnetic induction effect, the secondary magnetic field excited by the control ring 1 increases the magnetic field near it, so the molten metal 8 in the crucible is subjected to The electromagnetic force is also distributed in a smaller area near the control ring 1 than in other areas. As shown in Fig. 2(b), during one energization period of the solenoid coil 4, the coil 4 and the control ring 1 excite the alternating magnetic field B, which is composed of a radial component and an axial component. The induced electric field E is excited in the body 8. 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 8 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 8 to be subjected to the radially inward electromagnetic force for a period of time and value greater than the radially outward electromagnetic force, as shown in the figure 3(a), (Taking radially outward as the positive direction), and because under the action of the control ring 1, the magnetic field in the middle of the molten metal is large, the magnetic field at both ends is small and the mass is conserved, the molten metal in the middle will flow inward, and the molten metal at both ends will flow inward. The molten metal flows outward to form a complete circular trajectory. As the working time increases, the flow rate of the molten metal continues to increase until the motion resistance and the electromagnetic force reach a dynamic balance.

As shown in Figure 4, 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. This "double-circuit" turbulent flow motion similar to mechanical stirring 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 8 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 8 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 8 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 8 .

Second embodiment:

The difference between this embodiment and the first embodiment is that this embodiment adopts a weakened control loop 1 .

As shown in Figure 6, the weakened control ring 1 is located outside the middle of the metal melt 8. Since the weakened control ring 1 has excellent magnetic permeability, the magnetic field near the control ring 1 is weakened, so the electromagnetic force received by both ends of the metal melt 8 The force is larger, the electromagnetic force received by the middle part is smaller, the metal melt at both ends flows inward, while the middle part flows outward, and the metal melt forms a complete circulation loop, the flow form is turbulent flow, and the circulation direction is the same as that of the first The embodiment is reversed.

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 8 are subjected to the force of the fluid’s downward circulation movement, preventing them from floating up; Accelerated to float to the middle of the metal melt 8, and then to the bottom of the metal melt 8 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 8.

Third embodiment:

The difference between this embodiment and the first embodiment is that the reinforced control ring 1 used in this embodiment is located outside the upper end of the molten metal 8 .

As shown in Figure 7, the enhanced control ring 1 is located outside the upper end of the molten metal 8, so the upper end of the molten metal 8 is subjected to a greater electromagnetic force, the molten metal at the upper end flows inward along the radial direction, and the molten metal at the lower part flows radially inward. Flow outward to form a complete 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 8 drives the particles to move to the bottom of the crucible, and the circulating flow makes the upward-floating reinforcing particles evenly distributed in the metal melt 8 .

Fourth embodiment:

The difference between this embodiment and the third embodiment is that this embodiment adopts a weakened control loop 1 .

As shown in Figure 8, the weakened control ring 1 is located outside the upper end of the molten metal 8, so the electromagnetic force received by the upper end of the molten metal 8 is relatively small, the molten metal at the upper end flows outward along the radial direction, and the molten metal at the lower part flows outward along the radial direction. Flow inward to form a complete circulation loop, the flow form is turbulent flow, and the flow direction is opposite to that of the third 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 metal melt 8 drives the particles to move toward the liquid surface of the melt, and the sinking reinforcement particles are uniformly distributed in the metal melt 8 through circulation flow.

Fifth embodiment:

The difference between this embodiment and the fourth embodiment is that this embodiment uses two control loops 1-1 and 1-2. The control ring 1-1 is a weakened control ring, located outside the upper end of the molten metal 8; the control ring 1-2 is an enhanced control ring, located outside the lower end of the molten metal 8.

As shown in Figure 9, the control rings 1-1 and 1-2 are respectively located outside the upper end and the lower end of the molten metal 8, so the electromagnetic force received by the upper end of the molten metal 8 is reduced compared with that without the control ring, and the molten metal 8 The electromagnetic force received by the lower end is greater than that without the control ring. The molten metal at the upper end flows radially outward while the molten metal at the lower end flows inward, forming 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 particle-reinforced metal matrix composite casting is the mixing of metal melt and reinforced solid particles. The reinforced particles are sinking solids whose density is much higher than that of the metal matrix, and which can sink at a faster rate in static state. particles. In this embodiment, the upward flow of the metal melt 8 drives the particles to move toward the liquid surface of the melt, and the sinking reinforcement particles are uniformly distributed in the metal melt 8 through circulation flow.

Sixth embodiment:

The difference between this embodiment and the first embodiment is that the reinforced control ring 1 used in this embodiment is located between the lower end and the middle of the outer side of the molten metal 8 .

As shown in Figure 10, the enhanced control ring 1 is located between the lower end and the middle of the outer side of the metal melt 8. The metal melt in the vicinity of the control ring 1 is subjected to a relatively large electromagnetic force and flows radially inward, while the metal melt in other areas The melt is subjected to a small electromagnetic force and flows radially outward. The "double circuit" flow trajectory formed by the metal melt appears axially asymmetrical. The flow trajectory range of the upper half area is larger than that of the lower half area. The form is turbulent.

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 the floating reinforcing particles applicable to this embodiment is between that of the second embodiment and the third embodiment.

Seventh embodiment:

The difference between this embodiment and the sixth embodiment is that this embodiment adopts a weakened control loop 1 .

As shown in Figure 11, the weakened control ring 1 is located between the lower end and the middle of the outer side of the molten metal 8, and the molten metal in the vicinity of the control ring 1 is subjected to a small electromagnetic force and flows outward in the radial direction, while the metal in other areas The melt is subjected to a small electromagnetic force and flows radially inward. The "double circuit" flow trajectory formed by the metal melt appears axially asymmetrical. The flow trajectory range of the upper half area is larger than that of the lower half area. The form is turbulent.

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 fourth embodiment.

In addition to the above-mentioned embodiments, the control rings can have different forms, numbers, and combinations of positions to meet the requirements of various flow forms. Specifically, they can be 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 (10)

1. a kind of solenoid type magnetic stirrer with control ring characterized by comprising control ring, shell, line solenoid Circle, crucible, Resistant heating unit and heat insulation layer；

Coil support wall is provided in the shell, the solenoid coil is wrapped on the coil support wall, the helical Pipeline circle can provide radial and axial electromagnetic force after being powered；

The Resistant heating unit is used to heat and keep the molten condition of metal bath for the crucible；

The heat insulation layer protects the solenoid coil for completely cutting off high temperature；

The control ring is between the heat insulation layer and inner walls, for controlling different agitating modes.

2. solenoid type magnetic stirrer as described in claim 1, which is characterized in that the control ring is enhanced control ring When, the upper end on the outside of metal bath is set, and when work, the electromagnetic force that metal bath upper end is subject to is greater than the electricity that lower end is subject to Magnetic force, upper end metal bath flows radially inward and lower end metal bath flows outward, and metal bath forms an entirety Circulation loop, liquid form are turbulent flow.

3. solenoid type magnetic stirrer as described in claim 1, which is characterized in that the control ring is enhanced control ring When, when being located on the outside of metal bath half height, the magnetic field that the solenoid coil and control ring generate jointly is in gold It is smaller to belong to maximum both ends in the middle part of melt, metal bath is also in larger lesser point of the both ends in middle part in the electromagnetic force that synchronization is subject to Cloth.

4. solenoid type magnetic stirrer as described in claim 1, which is characterized in that the control ring is enhanced control ring When, it is arranged between the lower end and middle part on the outside of metal bath, when work, what metal bath was subject near control ring height Electromagnetic force is larger, and the electromagnetic force that other regions are subject to is smaller, and " double loop " flow trace that metal bath is formed occurs axially not Symmetrical, liquid form is turbulent flow.

5. solenoid type magnetic stirrer as described in claim 1, which is characterized in that the control ring is weakening type control ring When, the upper end on the outside of metal bath is set, and when work, the electromagnetic force that metal bath upper end is subject to is smaller, what lower end was subject to Electromagnetic force is larger, and upper end metal bath radially flows and lower end metal bath inwardly flows, and metal bath forms one Whole circulation loop, liquid form is turbulent flow.

6. solenoid type magnetic stirrer as described in claim 1, which is characterized in that the control ring is weakening type control ring When, when being located on the outside of metal bath half height, the magnetic field that the solenoid coil generates in the middle part of metal bath compared with Small both ends are bigger, and metal bath is also in the smaller biggish characteristic distributions in both ends in middle part in the electromagnetic force that synchronization is subject to.

7. solenoid type magnetic stirrer as described in claim 1, which is characterized in that when control ring is weakening type, and its It is arranged between the lower end and middle part on the outside of metal bath, when work, electromagnetism that metal bath is subject near control ring height Power is smaller, and the electromagnetic force that other regions are subject to is larger, and " double loop " flow trace that metal bath is formed occurs axially asymmetric Distribution, liquid form is turbulent flow.

8. solenoid type magnetic stirrer as described in claim 1, which is characterized in that when the control ring includes: enhanced When control ring and weakening type control ring, the lower end on the outside of metal bath, the weakening type control is arranged in the enhanced control ring Ring processed is arranged in the upper end on the outside of metal bath, and when work, the electromagnetic force being subject to when metal bath upper end is compared with no control ring reduces, The electromagnetic force being subject to when metal bath lower end is compared with no control ring increases, therefore upper end metal bath radially flows and lower end Metal bath inwardly flows, and metal bath forms the circulation loop of an entirety, and liquid form is turbulent flow.

9. such as the described in any item solenoid type magnetic stirrers of claim 1-8, which is characterized in that the solenoid type electromagnetism Blender further include: frequency converter and power supply, one end of the frequency converter connect the solenoid coil, the frequency converter it is another End connects the power supply, and the frequency converter can arbitrarily change the alive frequency of the solenoid coil institute between 0~100Hz, The power supply can arbitrarily change the alive virtual value size of the solenoid coil institute between 0~400A.

10. such as the described in any item solenoid type magnetic stirrers of claim 1-8, which is characterized in that the Resistant heating Unit includes: resistance wire, thermocouple and temperature regulation circuit；

The resistance wire is used for heating crucible, and the thermocouple is for detecting crucible temperature and temperature feedback being adjusted electricity to temperature Road, the temperature regulation circuit are maintained at crucible temperature in user's set temperature according to thermocouple feedback.