CN114570919B - Electromagnetic conveying device and method for metal melt - Google Patents

Abstract

The invention provides a metal melt electromagnetic conveying device and method, including a pump tube, a pump core and a magnetic field generator. The inside of the pump tube has an accommodation space, and the upper end and the lower end are respectively an outlet and an inlet connected to the accommodation space; the pump core is arranged in Inside the accommodation space, the periphery of the upper end is sealed and connected to the inner wall of the pump tube outlet, and the lower end extends to the inlet of the pump tube. There is a distribution surface in the circumferential direction and there are multiple through holes connecting the inside and outside of the pump core on the distribution surface; the magnetic field generator along the pump tube The circumferential arrangement and can generate a magnetic field so that under the action of the magnetic field, the molten metal flowing in from the inlet of the pump tube can be driven through the flow channel through the through hole and finally flow out from the outlet of the pump tube. The invention uses electromagnetic coils to generate electromagnetic force on the molten metal Promote the flow of the metal melt, and block the return channel of the melt through the pump core, so that the metal melt flows in the set direction. The structure is simple and reliable, no sealing is required, the operation and maintenance are convenient, the cost is low, and the transmission efficiency is high.

Description

Metal melt electromagnetic conveying device and method

technical field

The invention relates to the technical field of casting equipment, in particular to an electromagnetic conveying device and method for molten metal.

Background technique

In the process of metal casting, it is often necessary to transport the metal melt. The traditional technology is to use a transfer bag to dump, but the way of dumping the metal melt is seriously oxidized, the temperature drop is large, and there are certain safety hazards. Therefore, the industry has also invented Some new technologies are used to solve these problems. For example, the patent document CN109570481B discloses a pneumatic melt transport bag system and a melt delivery method. By inputting compressed air into the sealed transport bag, the metal melt is pressed out from the delivery pipeline. Although this design is safer than the traditional technology, the melt quality is better, and quantitative pouring can be achieved, but this method still has the following defects:

One is that due to the fastening and sealing of the bag cover and the bag body, it is inconvenient to add materials to the transport bag and the efficiency is low;

The second is that it is difficult to seal as a high-temperature equipment, and the reliability of the equipment is reduced;

The third is that due to the need to frequently open the cover to feed, it is inevitable that droplets, smoke, etc. will come into contact with the seal during the feeding process, as well as the aging of the seal itself, thermal deformation caused by temperature fluctuations, dust contamination of the seal in the foundry, etc. The reason is that the degree of sealing will be different each time, which will affect the accuracy of subsequent quantitative pouring.

Contents of the invention

Aiming at the defects in the prior art, the object of the present invention is to provide an electromagnetic conveying device and method for molten metal.

An electromagnetic conveying device for molten metal provided according to the present invention comprises:

The pump tube has an accommodation space inside, and the upper end and the lower end are respectively an outlet and an inlet connected to the accommodation space;

The pump core is arranged inside the accommodating space, the periphery of the upper end is sealingly connected to the inner wall of the outlet of the pump tube, and the lower end extends to the inlet of the pump tube, and has a distribution surface in the circumferential direction, and the distribution surface is connected to the pump tube everywhere. Flow channels of equal thickness are formed between the inner walls of the tube, and there are a plurality of through holes connecting the inside and outside of the pump core on the distribution surface;

a magnetic field generator, arranged along the circumference of the pump tube and capable of generating a magnetic field so that under the action of the magnetic field, the molten metal flowing in from the inlet of the pump tube can be driven through the flow channel through the through hole and finally from the Outflow from the pump tube outlet.

According to an electromagnetic conveying method for molten metal provided by the present invention, a magnetic field generator is used to apply an alternating electromagnetic field to the molten metal in the pump tube to promote the flow of the molten metal and limit the flow path of the molten metal through the pump core to finally The molten metal is forced to flow in a set direction.

Preferably, the magnetic field generator adopts a solenoid coil.

Preferably, the solenoid coil is wound into a helical shape with a hollow copper tube.

Preferably, the pump tube is a tubular structure made of ceramic material.

Preferably, the pump tube is placed inside the solenoid coil, and the tube wall of the pump tube is parallel to the inner surface of the solenoid coil.

Preferably, the inside of the magnetic field generator is in the shape of a circular truncated cone, the large-diameter end of the magnetic field generator faces the outlet of the pump tube, and the small-diameter end of the magnetic field generator faces the inlet of the pump tube; or

The inside of the magnetic field generator is in the shape of an annular cylinder.

Preferably, the flow rate and temperature of the molten metal can be adjusted by adjusting the alternating current of the magnetic field generator.

Preferably, a cooling medium is disposed on the magnetic field generator.

Preferably, the pump core is an inverted Ω-shaped or V-shaped structure.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention uses the electromagnetic coil to generate electromagnetic force on the metal melt to promote the flow of the metal melt, and blocks the return channel of the melt through the pump core, so that the metal melt flows in a set direction, so as to achieve the purpose of conveying the metal melt , compared with the prior art, the structure is simple and reliable, no sealing is required, the operation and maintenance are convenient, the cost is low, and the conveying efficiency is high.

2. The present invention controls the conveying flow rate and the induction heating degree of the molten metal by changing the alternating current, so that the conveying speed and temperature of the molten metal can be adjusted conveniently.

3. The present invention adopts mature and stable alternating current control technology, is simple to operate, and is convenient to realize automatic and intelligent operation.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of a comparative structure when the present invention has no pump core;

Fig. 3 is a schematic structural diagram of Embodiment 2 of the present invention.

The figure shows:

source container 1

Inlet connecting pipe 2

pump tube 3

Capacity 31

Outlet connection pipe 4

Pump core 5

Distribution surface 51

Through hole 52

Magnetic Field Generator 6

Runner 7

Metal melt 8

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

Example 1:

The present invention provides a metal melt electromagnetic conveying device, as shown in Figure 1, comprising a pump tube 3, a pump core 5 and a magnetic field generator 6, the inside of the pump tube 3 has an accommodation space 31, and the upper and lower ends of the pump tube 3 are respectively To communicate with the outlet and inlet of the accommodation space 31; the pump core 5 is arranged inside the accommodation space 31, the upper end of the pump core 5 is sealed and connected to the inner wall of the outlet of the pump tube 3, the lower end of the pump core 5 extends to the inlet of the pump tube 3, and the circumferential direction has a distribution surface 51, the distribution surface 51 and the inner wall of the pump tube 3 form a flow path 7 of equal thickness everywhere, and the distribution surface 51 has a plurality of through holes 52 communicating with the inside and outside of the pump core 5; the magnetic field generator 6 along the The circumferential arrangement of the pump tube 3 can generate a magnetic field so that the molten metal 8 flowing in from the inlet of the pump tube 3 can be driven through the flow channel 7 through the through hole 52 and finally flow out from the outlet of the pump tube 3 under the action of the magnetic field.

The magnetic field generator 6 preferably adopts an electromagnetic coil, such as a solenoid coil. The present invention arranges a solenoid coil outside the pump tube 3, sets a pump core 5 inside the pump tube 3, and allows the molten metal 8 to fill the pump tube 3, An alternating current is passed into the solenoid coil, and a cooling medium is arranged on the magnetic field generator 6 for cooling, and the cooling medium can be compressed air, cooling water, or the like. The molten metal 8 flows under the action of electromagnetic force, but the internal pump core 5 restricts the flow path of the molten metal 8 and forces the molten metal 8 to flow in a set direction, so as to achieve the purpose of conveying the molten metal 8 .

Specifically, the solenoid coil is preferably wound into a helical shape by using a hollow copper tube.

In a specific application, the pump tube 3 is placed inside the solenoid coil, and the tube wall of the pump tube 3 is parallel to the inner surface of the solenoid coil. The inside of the magnetic field generator 6 is in the shape of an annular truncated cone, the large-diameter end of the magnetic field generator 6 is towards the outlet of the pump tube 3, and the small-diameter end of the magnetic field generator 6 is towards the entrance of the pump tube 3, so that the electromagnetic thrust direction is more inclined to be in line with the pump tube 3. The molten metal 8 flows in the same direction so as to further improve the conveying efficiency. At this time, the sides of the pump tube 3 and the pump core 5 are also parallel to the coil and form an annular truncated cone; or the inside of the magnetic field generator 6 is in an annular cylindrical shape.

The flow rate and temperature of the molten metal 8 can be adjusted by adjusting the alternating current of the magnetic field generator 6 .

The pump core 5 is an inverted Ω-shaped or V-shaped structure.

In order to facilitate a better understanding of the present invention, now give an example, as shown in Figure 2, it is a comparative schematic diagram when there is no pump core 5 of the present invention. When there is no pump core 5, the outer layer of metal melt 8 in the pump tube 3 is subjected to radial electromagnetic The thrust moves radially toward the center, while the molten metal 8 in the center turns into an axial movement under extrusion, and the molten metal 8 on the upper side tends to flow upwards, which is commonly known as the "hump" phenomenon in the industry, and the molten metal at the bottom 8 is more inclined to flow downward; the metal melt 8 that flows upward or downward finally flows back to the outer layer under the negative pressure, and so on. At this time, the metal melt 8 can only form internal backflow without Overall move.

The difference between Figure 1 and Figure 2 is that the pump core 5 is added, the pump core 5 is arranged inside the pump tube 3, and the longitudinal section is in an inverted Ω shape, the open end of the pump core 5 faces the direction of the outlet of the metal melt 8, and the sealed end of the pump core 5 faces the In the direction of the entrance of the molten metal 8, the edge of the opening end of the pump core 5 is sealed and connected to the pump tube 3, the side of the pump core 5 is kept parallel to the inner surface of the pump tube 3, and the side of the pump core 5 is provided with a plurality of through holes 52 penetrating the side. The molten metal 8 outside the pump core 5 still moves radially toward the center under the radial electromagnetic thrust, enters the inside of the pump core 5, and turns to move axially at the center; but due to the limitation of the sealing end of the pump core 5, the molten metal inside the pump core 5 Body 8 can not flow towards the sealing end, but can only be extruded from the opening end of pump core 5; Therefore, the molten metal 8 outside the pump core 5 continuously enters the inside of the pump core 5 and flows out from the open end of the pump core 5 to achieve the purpose of transporting the molten metal 8 .

The present invention also provides a metal melt electromagnetic conveying method, using a magnetic field generator 6 to apply an alternating electromagnetic field to the metal melt 8 in the pump tube 3 to promote the flow of the metal melt 8 and restrict the metal melt 8 through the pump core 5 The flow path eventually forces the molten metal 8 to flow in a set direction.

Example 2:

This embodiment is a preferred example of Embodiment 1.

This embodiment provides a kind of metal melt electromagnetic transport, as shown in Figure 3, including source container 1, inlet connecting pipe 2, pump pipe 3, outlet connecting pipe 4, pump core 5, magnetic field generator 6, wherein, magnetic field The generator 6 adopts a solenoid coil, and the solenoid coil adopts a hollow copper tube to be wound into a spiral shape.

The source container 1 holds the metal melt 8 to be transported, and the bottom of the side of the source container 1 is provided with a melt outlet, and the inlet connecting pipe 2, the pump pipe 3, and the outlet connecting pipe 4 are sealed and connected in sequence to form a conveying channel for the metal melt 8; One end of the inlet connecting pipe 2 is sealed and connected to the discharge port of the source container 1, and the other end is sealed and connected to the inlet of the pump pipe 3; one end of the outlet connecting pipe 4 is sealed and connected to the outlet of the pump pipe 3, and the other end is sealed and connected to the material unit.

The side of the pump core 5, the pump tube 3, and the solenoid coil are arranged in parallel in order from the inside to the outside, all of which are in the shape of a truncated cone. The outlet height is lower than the initial liquid level of the source container 1; the longitudinal section of the pump core 5 is in an inverted Ω shape, the opening end of the pump core 5 faces the outlet end of the pump tube 3, the sealing end of the pump core 5 faces the inlet end of the pump tube 3, and the opening end of the pump core 5 The edge is in sealing connection with the pump tube 3 , the side of the pump core 5 is kept parallel to the inner surface of the pump tube 3 , and a plurality of through holes 52 are arranged on the side of the pump core 5 .

When this embodiment works, the outlet height of the pump tube 3 is lower than the initial liquid level of the source container 1, so the inlet connecting pipe 2 and the pump tube 3 are filled with molten metal 8. After the solenoid coil is energized, the external metal of the pump core 5 melts. The body 8 enters the inside of the pump core 5 through the through hole 52 on the side of the pump core 5 by the radial electromagnetic thrust. Due to the limitation of the sealing end of the pump core 5, the molten metal 8 is extruded from the open end of the pump core 5 and enters the outlet connecting pipe 4; Under the effect of negative pressure, the molten metal 8 in the source container 1 continuously flows into the outside of the pump core 3 through the inlet connecting pipe 2 . Therefore, the molten metal in the source container 1 is continuously pushed to the outlet connecting pipe 4 to achieve the purpose of conveying the molten metal 8 .

The working principle of the present invention is as follows:

After the solenoid coil is fed with an alternating current, the molten metal 8 in the pump tube 3 will be subjected to an inward electromagnetic force, so that the molten metal 8 is continuously pushed into the inner side of the pump core 5 from the outside of the pump core 5 through the through hole 52 . Due to the effect of negative pressure, the molten metal 8 continuously enters the outside of the pump core 5 from the inlet; while the molten metal 8 inside the pump core 5 can only flow from the open end to the outlet due to the restriction of the pump core 5 under the action of electromagnetic thrust. Therefore, the molten metal 8 can be continuously transported from the inlet to the outlet, and the flow rate and temperature of the molten metal 8 can be adjusted by controlling the parameters of the alternating current.

In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the application.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims (10)

1. An electromagnetic conveying device for molten metal, characterized in that it comprises: The pump tube (3) has an accommodation space (31) inside, and the upper end and the lower end are respectively an outlet and an inlet connected to the accommodation space (31); The pump core (5) is arranged inside the accommodating space (31), the periphery of the upper end is sealingly connected to the inner wall of the outlet of the pump tube (3), and the lower end extends to the inlet of the pump tube (3), with a distribution surface in the circumferential direction (51) and the flow channels (7) of equal thickness are formed everywhere between the distribution surface (51) and the inner wall of the pump tube (3). The internal and external through holes (52) of the pump core (5); the open end of the pump core (5) faces the outlet direction of the molten metal (8), and the sealed end of the pump core (5) faces the molten metal (8) In the inlet direction, the edge of the opening end of the pump core (5) is sealed with the pump tube (3); A magnetic field generator (6), arranged along the circumference of the pump pipe (3) and capable of generating a magnetic field so that under the action of the magnetic field, the molten metal (8) flowing in from the inlet of the pump pipe (3) can be driven Pass through the flow channel (7) through the through hole (52) and finally flow out from the outlet of the pump tube (3). 2. The electromagnetic conveying device for molten metal according to claim 1, characterized in that, the magnetic field generator (6) adopts a solenoid coil. 3 . The electromagnetic conveying device for molten metal according to claim 2 , wherein the solenoid coil is wound into a helical shape with a hollow copper tube. 4 . 4. The metal melt electromagnetic conveying device according to claim 1, characterized in that, the pump tube (3) is a tubular structure made of ceramic material. 5. The metal melt electromagnetic conveying device according to claim 2, characterized in that, the pump tube (3) is placed inside the solenoid coil, and the pump tube (3) wall and the solenoid coil are The surfaces are parallel. 6. The metal melt electromagnetic conveying device according to claim 1, characterized in that, the inside of the magnetic field generator (6) is in the shape of a circular truncated cone, and the large-diameter end of the magnetic field generator (6) faces the pump pipe (3 ), the small diameter end of the magnetic field generator (6) faces the inlet of the pump tube (3); or The inside of the magnetic field generator (6) is in the shape of an annular cylinder. 7. The metal melt electromagnetic conveying device according to claim 1, characterized in that, the flow rate and melt temperature of the metal melt (8) can be carried out by adjusting the alternating current mode of the magnetic field generator (6) adjust. 8. The electromagnetic conveying device for molten metal according to claim 1, characterized in that a cooling medium is disposed on the magnetic field generator (6). 9. The electromagnetic conveying device for molten metal according to claim 1, characterized in that, the pump core (5) is an inverted Ω-shaped or V-shaped structure. 10. A metal melt electromagnetic conveying method, characterized in that, using the metal melt electromagnetic conveying device described in any one of claims 1 to 9, utilizing a magnetic field generator (6) to move the metal in the pump tube (3) The melt (8) applies an alternating electromagnetic field to push the molten metal (8) to flow and restrict the flow path of the molten metal (8) through the pump core (5) to finally force the molten metal (8) toward a set direction flow.

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