CN216263380U - Device for electromagnetically conveying cold steel - Google Patents

Abstract

The utility model belongs to the technical field of continuous casting in ferrous metallurgy industry, and particularly relates to a device for electromagnetically conveying cold steel, which is characterized by comprising an insulating guide groove, a coil, a feeding funnel, a power supply, a PLC (programmable logic controller) and a gas protection system, wherein an opening at one end of the insulating guide groove is connected with the feeding funnel, an opening at the other end of the insulating guide groove is communicated with the side wall of a water outlet arranged between a tundish and a crystallizer through a connecting fastener, the coil is wound on the insulating guide groove, and two ends of the coil are respectively connected with the power supply and the PLC; the gas protection system comprises a protective gas tank, a gas pipeline and a regulating valve on the gas pipeline, and the gas pipeline is communicated with the insulating guide groove. The utility model has the advantages that: 1) cold steel can be added by utilizing the original water gap, and the method has good adaptability to the plate blank or square billet with smaller casting size; 2) the problem of air holes in the steel billet is solved. 3) The speed of adding cold steel into the crystallizer can be controlled; 4) the device has simple structure and low operation and maintenance cost.

Description

A device for electromagnetic conveying cold steel

technical field

The utility model relates to the technical field of continuous casting in the iron and steel metallurgy industry, in particular to a device for electromagnetically conveying cold steel.

Background technique

In recent years, continuous casting technology has made great progress. With the continuous increase of the pulling speed, the internal quality defects such as segregation and porosity in the center of the billet have gradually become prominent. Rapidly reducing the degree of superheat in the center of the mold and promoting the rapid and uniform crystallization process in the section of the slab is an effective means to eliminate the center segregation and improve the internal quality of the slab. The continuous casting mold feeding steel strip technology inserts the steel strip into the mold to change the distribution of the temperature field in the mold. The distribution is more conducive to the equiaxed crystal crystallization process, which is beneficial to improve the nucleation rate of the slab, thereby improving the quality of the continuous casting slab and optimizing the solidification structure of the slab, which has a good application prospect in industry. In China, some enterprises have completed the experimental work of the continuous casting mold feeding steel strip process equipment, but during the feeding of the steel strip, the liquid level of the mold will fluctuate, and problems such as slag entrainment will occur, which seriously affects the quality of the continuous casting billet. Industrialized mass production cannot be achieved.

Patent Publication No. CN102974791A discloses a continuous casting mold feeding steel belt system. The steel belt enters an electromagnetic vibrator from a guide tube and then enters the mold. The band is forced to resonate. However, the electromagnetic vibration guide tube will disturb the mold slag layer and cause slag entrainment, and the inserted guide tube will also be eroded and damaged in the high-temperature molten steel, polluting the molten steel. Patent Publication No. CN107900298A discloses a mold feeding device for producing high-quality continuous casting slabs; the steel strip is fed through the feeding belt guide groove and fed to the thickness center position of the mold. The disadvantage is that the structure is complicated and the cost is high. At the same time, when the cold steel enters the mold, the mold flux on the surface of the molten steel will be brought into the molten steel, which will affect the quality of the cast slab. Patent Publication No. CN206065356U discloses a protective device for a variable slag line for continuous casting mold feeding strip steel and a continuous casting mold. The protective slag is discharged through the protective device and then the cold steel strip is added upright in the protective tube. The disadvantage is that the exposed molten steel will be oxidized and affect the quality of the slab.

It can be seen that in the existing belt feeding technology, one is to directly add cold steel strip to the mold through the steel feeding device. This kind of technology will involve the mold flux and enter the inside of the billet during the steel feeding process, which will affect the quality of the billet. ; The other type is to use slag discharge devices, such as slag discharge baffles, slag discharge hoods, etc. This type of device will occupy a large space in the upper part of the mold, which will bring inconvenience to the production operation, the device is complicated, and the maintenance cost will increase in the later period. In the long-term work, the refractory material on the slag avoidance device immersed in the molten steel will also fall off into the molten steel and affect the quality of the casting billet. At the same time, the exposed molten steel will be oxidized and also affect the quality of the casting billet. The electromagnetic vibration method can reduce the occurrence of slag sticking, but this type of vibration feeding steel has a great influence on the fluctuation of the molten steel level, and the phenomenon of slag entrainment is serious, which will still lead to the decline of the quality of the casting billet.

SUMMARY OF THE INVENTION

The purpose of this utility model is to provide a device for electromagnetically transporting cold steel, which overcomes the deficiencies of the prior art, transports cold steel to the nozzle by electromagnetic force and adds cold steel, reduces the requirements for the upper space of the mold, and can adapt to almost all types of It can solve the problem of slag entrainment in the continuous casting mold feeding cold steel, improve the nucleation rate of the billet or the inside of the billet, optimize the solidification structure of the billet or ingot, and improve the quality of the continuous casting billet.

In order to achieve the above object, the utility model adopts the following technical solutions to realize:

A device for electromagnetically conveying cold steel, which is characterized in that it includes an insulating guide groove, a coil, a feeding funnel, a power supply, a PLC controller, and a gas protection system. The fastener is communicated with the side wall of the water outlet located between the tundish and the mold, the insulating guide groove is wound with a coil, and the two ends of the coil are respectively connected with the power supply and the PLC controller; the gas protection system includes protective gas The tank, the gas pipeline and the regulating valve on the gas pipeline, and the gas pipeline are all connected with the insulating guide groove.

Further, the connecting fastener structure includes a mounting seat, a sealing ring, a guide groove joint and a screw buckle, the mounting seat is embedded in the side wall of the refractory material of the water outlet, and the guide groove joint is made of steel and outside the other end of the insulating guide groove. The diameter is matched, and the screw buckle is engaged with the external thread on the mounting seat.

Further, the sealing ring is a graphite sealing ring.

Further, the central axis of the guide groove joint has an included angle inclined upwardly by 5-30 degrees, and the mating section with the other end of the insulating guide groove is not less than 50 mm.

The connecting fastener proposed by the utility model can be used as a substitute for the whole or a section of the nozzle to protect the nozzle from damage, the electromagnetic conveying device is filled with protective gas, the internal and external air pressure of the electromagnetic conveying device is balanced, the backflow of molten steel is avoided, and the cold steel is subjected to Loran The effect of this force will send the cold steel out into the tundish sewer, and enter the mold according to the flow of molten steel.

Compared with blowing into cold steel with carrier gas, adding cold steel by electromagnetic force overcomes the problem of pores inside the billet; and the whole working process of this design is not in contact with high-temperature molten steel, which avoids the hot corrosion of the device and the corrosion of molten steel. Erosion is beneficial to prolong the service life of the electromagnetic device.

Compared with the prior art, the beneficial effects of the present utility model are:

1) Only the original nozzle can be used to add cold steel, which increases the upper space of the mold and has a very good adaptability to the casting of slabs or billets with small sizes;

2) The present utility model proposes a new method of adding cold steel, which is a method of adding cold steel at the tundish downhole and entering the mold, so as to avoid the cold steel being involved in mold slag while being added;

3) By balancing the internal and external air pressure of the electromagnetic conveying device through the protective gas, and then adding the cold steel by electromagnetic force, compared with blowing the cold steel with the carrier gas, the problem of pores inside the billet is overcome.

4) According to the actual process parameters and requirements, the speed at which the cooling steel is added to the mold can be controlled;

5) The electromagnetic conveying device is not in contact with the high-temperature molten steel flowing out of the tundish, which avoids the hot corrosion of the device and the erosion of molten steel, thereby prolonging the service life of the electromagnetic conveying device;

6) The connecting fastener can be used as a substitute for the whole or a section of the nozzle to protect the nozzle from damage, which improves the damage resistance of the existing nozzle;

7) The device of the utility model has the advantages of simple structure, low operation and maintenance cost, and wide versatility.

Description of drawings

1 is a schematic structural diagram of an embodiment of a device for electromagnetically conveying cold steel according to the present invention;

2 is a schematic structural diagram of an embodiment of the method for electromagnetically transporting cold steel according to the present invention, showing the state of adding cold steel;

3 is a schematic structural diagram of a connecting fastener in an embodiment of the present invention.

In the picture: 1- molten steel, 2- tundish, 3- electromagnetic conveying device, 4- cold steel, 5- mold, 6- water outlet, 7- tundish temperature measuring device, 8- insulation guide groove, 9- coil (set multiple groups), 10-feeding funnel, 11-connecting fastener, 12-power supply, 13-PLC controller, 14-exhaust valve, 15-inlet valve, 16-exhaust pump, 17-pressure controller, 18-Gas flowmeter, 19-Protective gas tank, 21-Suction refractory material, 22-Mounting seat, 23-Guide groove joint, 24-Sealing ring, 25-Screw buckle.

Detailed ways

Below in conjunction with embodiment, the technical scheme of the present utility model is further described:

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

1 to FIG. 3 are schematic structural diagrams of an embodiment of a device for electromagnetically conveying cold steel according to the present invention, including an insulating guide groove 8, a coil 9, a feeding funnel 10, a power supply 12, a PLC controller 13, and a gas protection system, One end of the insulating guide groove 8 is opened to connect with the feeding funnel 10, and the other end of the opening is connected to the water outlet 6 provided between the tundish 2 and the mold 5 through the connecting fastener 11. The insulating guide groove 8 is wound with a coil 9. The two ends of the coil 9 are respectively connected with the power supply 12 and the PLC controller 13; 16, the exhaust pipeline and the control valve on the pipeline; the gas protection system includes the protective gas tank 19, the gas pipeline and the regulating valve on the gas pipeline, Both the exhaust pipeline and the gas pipeline are communicated with the insulating guide groove 8 .

The connecting fastener structure includes a mounting seat 22, a sealing ring 24, a guide groove joint 23 and a screw buckle 25. The mounting seat 22 is embedded in the side wall of the refractory material 21 of the drain outlet, and the guide groove joint 23 is made of steel and the insulating guide groove 8. The outer diameter of the other end is matched, and the screw buckle 25 is engaged with the external thread on the mounting seat 22 . The sealing ring 24 is a graphite sealing ring. The central axis of the guide groove joint 23 has an upwardly inclined angle of 5-30 degrees, and the mating section with the other end of the insulating guide groove 8 is not less than 50 mm, so as to reduce the movement resistance of the cold steel.

The utility model creatively proposes the idea of adding cold steel at the nozzle of the tundish, which is completely different from the traditional method. No other cold steel adding device is designed on the molten steel surface of the mold, and it only needs to be carried out in the middle of the original nozzle. The design and installation saves a large area of operable space for the liquid level of the crystallizer; the utility model avoids the direct contact of the device with molten steel and prolongs the service life of the cold steel conveying device. The utility model can simply and quickly control the adding speed of the cold steel through the actual casting parameters and can continuously add the cold steel; the utility model can avoid the backflow of the molten steel by balancing the air pressure. In the continuous casting process, in order to prevent the molten steel from flowing back into the electromagnetic conveying device during the casting process, causing damage to the electromagnetic conveying device and polluting the molten steel, the utility model is installed and designed a set of gas protection system outside the insulating guide groove, which can balance During the casting process, the negative pressure caused by the downstream flow of the molten steel can avoid the backflow of the molten steel, and at the same time, the cold steel conveying device can be independent of the outside of the nozzle and not affect the molten steel.

The material of the insulating guide groove designed by the utility model is mainly calcium carbonate material, and the connecting fastener 11 can stabilize the connection between the electromagnetic conveying device and the tundish water outlet, and can prevent the two refractory materials from being squeezed and damaged. The sealing ring 24 is fixed by the screw buckle 25, so that the water outlet 6 and the electromagnetic conveying device 3 are stably connected. Before the start of casting, first fill up the cold steel 4 in the feeding funnel 10, then close the upper mouth of the funnel to seal the cold steel conveying device, then open the exhaust valve 14, and open the exhaust pump 16 through the pressure controller 17 to drain the electromagnetic conveying device. After the air is exhausted, close the exhaust valve 14, then open the intake valve 15, and open the gas flow meter 18 through the pressure controller 17, thereby adding the argon in the argon gas storage tank 19 to the electromagnetic conveying device 3. Balance the air pressure, at this time the electromagnetic conveying device enters the working state, the temperature in the tundish is detected by the tundish temperature measuring device 7 and returned to the PLC controller 13, the current in the coil 9 is controlled by the PLC controller 13, and the cold steel 4 is in the magnetic field. Under the action of the magnetic field force generated by the coil 9, it moves to the lower nozzle 6 of the tundish, and enters the mold according to the flow of molten steel. The entry of cold steel changes the distribution of the temperature field in the mold, which first solidifies and then melts in the mold, reducing the superheat of the molten steel and the temperature gradient of the slab section, making the temperature distribution more conducive to the equiaxed crystallization process. , which is beneficial to the improvement of the nucleation rate of the slab.

The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The equivalent replacement or modification of the scheme and its utility model concept shall be included within the protection scope of the present utility model.

Claims (4)

1. a device for electromagnetically transporting cold steel, is characterized in that, comprises insulating guide groove, coil, charging funnel, power supply, PLC controller, gas protection system, one end of described insulating guide groove is open to connect charging funnel, and the other end is open The connecting fastener is connected with the side wall of the water outlet set between the tundish and the mold, the insulating guide groove is wound with a coil, and the two ends of the coil are respectively connected with the power supply and the PLC controller; the gas protection system includes The protective gas tank, the gas pipeline and the regulating valve on the gas pipeline are connected with the insulating guide groove. 2 . The electromagnetic conveying cold steel device according to claim 1 , wherein the connecting fastener structure comprises a mounting seat, a sealing ring, a guide groove joint and a screw buckle, and the mounting seat is embedded in the refractory material of the water outlet. 3 . In the side wall of the duct, the guide groove joint is made of steel and matches the outer diameter of the other end of the insulating guide groove, and the screw buckle is engaged with the external thread on the mounting seat. 3 . The device for electromagnetically conveying cold steel according to claim 2 , wherein the sealing ring is a graphite sealing ring. 4 . 4 . The device for electromagnetically conveying cold steel according to claim 2 , wherein the central axis of the guide groove joint has an angle of 5-30 degrees inclined upward, and the other end of the insulating guide groove The mating section is not less than 50mm.

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