Long-service-life self-heating casting nozzle and using method

Abstract

The invention belongs to the technical field of casting and rolling, and particularly relates to a long-service-life self-heating casting nozzle and a using method thereof.The self-heating casting nozzle comprises a casting nozzle structure and a magnet exciting coil system; the casting nozzle structure comprises a casting nozzle box, one end of the casting nozzle box is provided with a conical feeding port, and the other end of the casting nozzle box is provided with a discharging port. An adjusting plate is arranged at a notch in the upper end of the casting mouth box, and an adjusting assembly is arranged above the adjusting plate. The periphery of the casting mouth box structure cavity is surrounded by the magnet exciting coil system, the magnet exciting coil system comprises a magnet exciting coil, a copper inner sleeve is arranged on the inner ring side of the magnet exciting coil, end covers are arranged on the two end sides of the magnet exciting coil, supporting plates are arranged between the magnet exciting coil and the end covers and between the magnet exciting coil and the copper inner sleeve, and a magnet exciting coil system outer sleeve is arranged on the outer ring side of the magnet exciting coil; and a cold water nozzle is sleeved outside the excitation coil system. The opening and closing degree of the discharging port is adjusted by adjusting the angle of the adjusting plate, and the discharging thickness is controlled to be 3-5 mm; and through the action of the magnet exciting coil system, the temperature drop and the structure uniformity of the semi-solid melt are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of casting and rolling, and particularly relates to a long-life self-heating casting nozzle and a use method thereof. Background Art

[0002] The research and application of magnesium alloys are attracting more and more attention due to their low density, high specific stiffness, high specific strength, dimensional stability, high thermal conductivity, and good mechanical processing performance. The deformed magnesium alloy products produced by the rolling process have higher strength, better ductility, and more diverse mechanical properties than cast magnesium alloys, and can meet more usage requirements.

[0003] In the process of magnesium alloy casting and rolling, the casting nozzle is the key part for conveying and distributing the molten metal in the continuous casting and rolling process, and plays an important role in the stable production of magnesium alloy and improving product quality. The casting nozzles currently used in production are mostly fixed casting nozzle structures composed of a casting nozzle upper pressure plate and a casting nozzle lower pressure plate. During the use of such products, the structure is fixed, and the thickness of the plate to be produced cannot be adjusted in time during the production process.

[0004] At the same time, in the process of rolling the high-temperature molten metal through the casting nozzle, the temperature drop and state of the molten metal in the casting nozzle cannot be controlled, causing defects such as component segregation and cracks in the cast and rolled products. Summary of the invention

[0005] In view of the problems existing in the commonly used casting nozzles in the casting and rolling process of magnesium alloys, the purpose of the present invention is to provide a long-life self-heating casting nozzle structure to meet the production requirements for casting and rolling of 3-5mm magnesium alloy plates, while avoiding defects such as component segregation and cracks in the magnesium alloy during the casting and rolling process.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: providing a long-life self-heating casting nozzle, which includes a casting nozzle box structure and an excitation coil system; the casting nozzle box structure includes a casting nozzle box, an adjustment plate, and an adjustment component; the excitation coil system includes an excitation coil, a copper inner sleeve, an end cover, an excitation coil system outer sleeve, and a support plate; the excitation coil system is fixed on the outside of the casting nozzle box cavity; the excitation coil system is fixed around the outside of the casting nozzle box cavity.

[0007] A conical feed port is provided at one end of the nozzle box, and a discharge port is provided at the other end of the nozzle box. The upper end of the side wall of the discharge port of the nozzle box is an inclined surface, and an adjustment plate is provided at the notch at the upper end of the nozzle box. An adjustment component for adjusting the angle of the adjustment plate to control the discharge thickness of the material at the discharge port is provided above the adjustment plate.

[0008] The casting nozzle box and the adjusting plate are both made of aluminum alloy.

[0009] The inner cavity wall formed by the casting nozzle box and the adjusting plate is coated with a wear-resistant coating.

[0010] Threaded holes are arranged on both sides of one end of the adjusting plate, and a through hole is arranged on the side wall of the casting nozzle box near the end of the notch; the adjusting plate and the casting nozzle box are rotatably connected through a single-head stud.

[0011] The adjustment assembly includes a fixed bracket, an adjusting screw, a screw connector, a sliding block, a sliding rod, and a fixed block; the fixed bracket is connected to the inclined surface of the side wall of the nozzle box by screws, a threaded hole is provided at the center position of the top plate of the fixed bracket, an adjusting screw is connected to the threaded hole, and the lower end of the adjusting screw is rotatably connected to the screw connector composed of two connecting blocks; the screw connector is connected to the sliding block, the sliding block is connected to the sliding rod by sliding, two fixed blocks are connected at both ends of the sliding rod, and the fixed block is fixed on the adjustment plate.

[0012] An excitation coil is provided inside the excitation coil system, a copper inner sleeve is provided on the inner ring side of the excitation coil, and an inner support plate is provided between the excitation coil and the copper inner sleeve; end covers are provided on both ends of the excitation coil, and a side support plate is provided between the excitation coil and the end covers, and the inner support plate and the side support plate are connected to form a support plate as a whole.

[0013] An annular boss is provided on the inner wall of the end cover, a threaded hole is provided on the boss, and the copper inner sleeve is connected to the threaded hole on the end cover boss by fastening bolts.

[0014] An excitation coil system jacket is provided on the outer ring side of the excitation coil, an annular boss is provided at the edge of the inner wall of the excitation coil system jacket, the boss is provided with a threaded hole, and the end cover is connected to the threaded hole on the boss of the excitation coil system jacket by a fastening bolt.

[0015] The excitation coil system jacket is equipped with a cold water nozzle, which is installed on the excitation coil system jacket through a rubber chuck; a coil cable passage is provided on the top of the excitation coil system jacket, a water outlet is provided on the side of the excitation coil system jacket near the bottom, and a thread is provided on the outer cylindrical surface of the water outlet; a raised platform is provided at the bottom of the excitation coil system jacket.

[0016] The water outlet of the outer jacket of the excitation coil system is connected with a plastic hose.

[0017] The cable of the excitation coil is connected to an external power source through a cable opening of the excitation coil system jacket.

[0018] The end cover and the outer casing of the excitation coil system are both made of steel.

[0019] The present invention can achieve the following beneficial effects through the above technical features: The present invention can control the angle of the adjustment plate through the adjustment component, thereby controlling the opening and closing degree of the adjustment plate, and can realize the production of 3-5mm thick plates according to needs; 2. The present invention generates an alternating magnetic field by passing alternating current into the excitation coil. The alternating magnetic field acts on the molten metal in the casting nozzle cavity, generating an induced current in the molten metal. The induced current and the alternating magnetic field generate an electromagnetic force to stir the molten metal, thereby making the flow field, temperature field and solute field of the molten metal uniform, thereby refining the grains of the cast-rolled plate, making the composition uniform and improving the quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is an exploded schematic diagram of the excitation coil system of the present invention; Figure 3 It is a schematic diagram of the structure of the regulating component in the present invention; Figure 4 It is a schematic diagram of the adjusting screw and the screw connecting head in the present invention; Among them: 1. Casting nozzle box; 2. Adjustment plate; 3. Fixed bracket; 4. Sliding rod; 5. Sliding block; 6. Screw connector; 7. Adjustment screw; 8. Front cover; 9. Excitation coil system jacket; 10. Rear cover; 11. Coil cable port; 12. Conical feed port; 13. Rubber chuck; 14. Cold water nozzle; 15. Water outlet; 16. Fastening bolt; 17 Single-head stud; 18. Fixed block; 19. Discharge port; 20. Front support plate; 21. Copper inner sleeve; 22. Inner support plate; 23. Excitation coil; 24. Excitation coil cable; 25. Rear support plate; 26. Raised platform; 27. Screw connector block. DETAILED DESCRIPTION

[0021] like Figure 1-4 As shown, in an embodiment of the present invention, a long-life self-heating nozzle structure is provided, which includes a nozzle box structure and an excitation coil system; the nozzle box structure includes a nozzle box 1, one end of the nozzle box 1 is provided with a conical feed port 12, and the other end of the nozzle box 1 is provided with a discharge port 19; the upper end of the side wall of the discharge port of the nozzle box is an inclined surface, so that the discharge port 19 of the nozzle box can be as close to the roll as possible during operation; an adjusting plate 2 is provided at the notch at the upper end of the nozzle box 1, and an adjusting component for adjusting the angle of the adjusting plate to control the discharge thickness of the discharge port is provided above the adjusting plate 2.

[0022] like Figure 3As shown, the adjustment assembly includes a fixed bracket 3, which is connected to the inclined surface of the side wall of the nozzle box. The bottom surface of the fixed bracket 3 is an inclined surface, so as to ensure that the fixed bracket is in a vertical state after installation; a threaded hole is provided at the center position of the top of the fixed bracket 3, and an adjusting screw 7 is connected to the threaded hole. The cylindrical head at the lower end of the adjusting screw 7 is connected to the circular hole of a screw connector 6 composed of two screw connectors 27, and the screw connector 6 is connected to a sliding block 5. The sliding block 5 is connected to a sliding rod 4 by sliding. Two fixed blocks 18 are connected at both ends of the sliding rod 4, and the fixed blocks 18 are fixed on the adjustment plate 2. Threaded holes are provided on both sides of one end of the adjustment plate 2, and a through hole is provided near the end of the notch on the side wall of the nozzle box 1. The threaded hole of the adjustment plate is connected to the threaded part of the single-head stud 17, and the through hole on the side wall of the nozzle box 1 is connected to the smooth outer circle of the single-head stud 17.

[0023] When the angle of the adjusting plate 2 is adjusted, the adjusting screw 7 is rotated to make the adjusting screw 7 move up and down relative to the fixed bracket 3, and the angle between the adjusting screw assembly composed of the adjusting screw 7 and the screw connector 6 and the sliding block 5 changes, so that the sliding block 5 and the sliding rod 4 produce relative movement. At the same time, the adjusting plate 2 changes its angle relative to the casting nozzle box with the single-head stud 17 as the rotation axis, thereby changing the size of the discharge port.

[0024] In the embodiment of the present invention, the nozzle box 1 and the adjustment plate 2 are both made of aluminum alloy.

[0025] In the embodiment of the present invention, the inner cavity wall formed by the nozzle box 1 and the adjustment plate 2 is coated with a wear-resistant coating.

[0026] like Figure 2 As shown, in the embodiment of the present invention, the excitation coil system includes an excitation coil 23, a copper inner sleeve 21 is provided on the inner ring side of the excitation coil 23, and four inner support plates 22 are provided between the excitation coil 23 and the copper inner sleeve 21; the two end sides of the excitation coil 23 are respectively provided with a front end cover 8 and a rear end cover 10, and four front support plates 20 are provided between the excitation coil 23 and the front end cover 8; four rear support plates 25 are provided between the excitation coil 23 and the rear end cover 10, and the inner support plates 22, the front support plates 20 and the rear support plates 25 are connected to form a support plate as a whole.

[0027] In the embodiment of the present invention, the inner walls of the front and rear end covers are provided with annular bosses, the annular bosses are provided with threaded holes, and the copper inner sleeve 21 is connected to the threaded holes on the annular bosses of the end covers by fastening bolts 16.

[0028] In the embodiment of the present invention, an excitation coil system jacket 9 is provided on the outer ring side of the excitation coil 23, an annular boss is provided at the edge of the inner wall of the excitation coil system jacket 9, and the boss is provided with a threaded hole. The front and rear end covers are connected to the threaded holes on the annular boss of the excitation coil system jacket 9 by fastening bolts 16.

[0029] The excitation coil system jacket 9 is equipped with six cold water nozzles 14 (two at the top, two at the bottom, and one on each side), and the cold water nozzles 14 are installed on the excitation coil system jacket 14 through a rubber chuck 13; in order to prevent the bottom of the inner cavity of the excitation coil system from being submerged in water during operation, thereby affecting the normal operation of the two cold water nozzles 14 at the bottom, a raised platform 26 is provided at the bottom of the excitation coil system jacket 9, and the two cold water nozzles 14 at the bottom are set on the raised platform 26; a coil cable passage 11 is provided at the top of the excitation coil system jacket 9, and a water outlet 15 is provided at the side of the excitation coil system jacket 9 near the bottom.

[0030] In the embodiment of the present invention, the copper inner sleeve 21, the front cover 8, the rear cover 10, and the excitation coil system outer sleeve 9 are connected to form an excitation coil system housing, and the excitation coil 23 is fixed to the excitation coil system housing through four support plates.

[0031] In the embodiment of the present invention, the copper inner sleeve 21 has good magnetic permeability and can significantly improve electromagnetic utilization.

[0032] The cable 24 of the excitation coil 23 is connected to an external power source through the coil cable port 11 of the excitation coil system jacket 9; In the embodiment of the present invention, the front end cover 8, the rear end cover 10 and the excitation coil system housing 9 are all made of steel.

[0033] In the embodiment of the present invention, the water outlet 15 of the excitation coil system housing 9 is provided with threads, and the water outlet 15 is connected to a plastic hose, and the threads on the water outlet 15 can prevent the plastic hose from slipping.

[0034] The implementation principle and steps of the excitation coil system are as follows: an alternating current is supplied to the excitation coil 23 to generate an alternating magnetic field, the molten metal enters the inner cavity of the casting nozzle box 1 through the conical feed port 12, the alternating magnetic field generated by the excitation coil 23 acts on the molten metal in the cavity of the casting nozzle box 1, and an induced current is generated in the molten metal. The electromagnetic force generated by the induced current and the alternating magnetic field can stir the melt, and even out the flow field, temperature field and solute field of the melt, thereby refining the grains of the cast and rolled sheet, making the composition uniform and improving the quality. At the same time, the cold water nozzle 14 on the outer sleeve 9 of the excitation coil system continuously sprays cooling water to the excitation coil 23, and the cooling water flows to the bottom of the excitation coil system shell and flows out from the water outlet 15 at the bottom, taking away the heat generated during the working process of the excitation coil 23, and ensuring the normal operation of the excitation coil 23.

[0035] The words "include", "including" and similar words used in the present invention mean that the content before the word is composed of the content after the word, but does not exclude other constituent contents; the words "connect", "connected" and similar words used in the present invention may include connections in the form of gluing, welding, riveting, threaded connection, etc., and are not limited to ordinary wire connection, conductor connection, etc.

[0036] It should also be noted that although the embodiments of the present invention have been described, any improvements, combinations and modifications made by ordinary technicians in this field based on the spirit of the present invention without making any creative work should fall within the scope of protection of the present invention.

Claims

1. A long-life self-heating casting nozzle, characterized in that: It includes a casting nozzle structure and an excitation coil system; The nozzle box structure comprises a nozzle box, one end of which is provided with a conical feed port, and the other end of which is provided with a discharge port; the upper end of the side wall of the discharge port of the nozzle box is an inclined surface, an adjustment plate is provided at the notch at the upper end of the nozzle box, and an adjustment component for adjusting the angle of the adjustment plate to control the discharge thickness of the discharge port is provided above the adjustment plate; The excitation coil system comprises an excitation coil, the inner ring side of the excitation coil is provided with a copper inner sleeve, and the two ends of the excitation coil are provided with end covers; a support plate is provided between the excitation coil, the end cover and the copper inner sleeve, the outer ring side of the excitation coil is provided with an excitation coil system outer sleeve, and the excitation coil system outer sleeve is provided with a cold water nozzle; The casting nozzle box and the adjusting plate are both made of aluminum alloy, and the inner cavity wall formed by the casting nozzle box and the adjusting plate is coated with a wear-resistant coating.

2. A long-life self-heating casting nozzle according to claim 1, characterized in that: Threaded holes are arranged on both sides of one end of the adjusting plate, a through hole is arranged on the side wall of the casting nozzle box near the cut-off point of the notch, and a single-head stud is connected to the threaded hole of the adjusting plate.

3. A long-life self-heating casting nozzle according to claim 1, characterized in that: The adjustment component includes a fixed bracket, which is fixedly connected to the inclined surface of the side wall of the casting nozzle box. A threaded hole is provided at the center position of the top plate of the fixed bracket, and an adjusting screw is connected to the threaded hole. The lower end of the adjusting screw is connected to a screw connector composed of two connecting blocks, and the screw connector is connected to a sliding block, and the sliding block is connected to a sliding rod. Two fixed blocks are connected at both ends of the sliding rod, and the fixed blocks are fixed on the adjustment plate.

4. A long-life self-heating casting nozzle according to claim 1, characterized in that: The excitation coil system is provided with an excitation coil inside, a copper inner sleeve is provided on the inner ring side of the excitation coil, end covers are provided on both ends of the excitation coil, the end covers are connected to the copper inner sleeve by threads, an inner support plate is provided between the excitation coil and the copper inner sleeve, a side support plate is provided between the excitation coil and the end covers, and the inner support plate and the side support plate are connected as a whole by threads. An excitation coil system outer sleeve is provided on the outer ring side of the excitation coil, and the excitation coil system outer sleeve is connected to the end covers by threads.

5. A long-life self-heating casting nozzle according to claim 4, characterized in that: The excitation coil system jacket is equipped with a cold water nozzle, the top of the excitation coil system jacket is provided with a coil cable passage, the side of the excitation coil system jacket near the bottom is provided with a water outlet, and the bottom of the excitation coil system jacket is provided with a raised platform.

6. A long-life self-heating casting nozzle according to claim 1, characterized in that: The excitation coil system is fixedly surrounded on the outside of the casting nozzle box cavity.

7. A method for using a long-life self-heating casting nozzle, characterized in that: Alternating current is supplied to the excitation coil to generate an alternating magnetic field. The molten metal enters the inner cavity of the casting nozzle box through the conical feed port. The alternating magnetic field generated by the excitation coil acts on the molten metal in the casting nozzle box cavity, generating an induced current in the molten metal. The electromagnetic force generated by the induced current and the alternating magnetic field stirs the molten metal. The cold water nozzle on the outer jacket of the excitation coil system continuously sprays cooling water to the excitation coil. The cooling water flows to the bottom of the outer shell of the excitation coil system and flows out from the water outlet at the bottom. Adjust the angle of the adjusting plate and rotate the adjusting screw to move the adjusting screw up and down relative to the fixed bracket; the angle between the adjusting screw assembly composed of the adjusting screw and the screw connector and the sliding block changes, so that relative movement occurs between the sliding block and the sliding rod, and the adjusting plate changes its angle relative to the casting nozzle box with the single-head stud as the rotation axis, thereby changing the size of the discharge port.

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