Up-drawing continuous casting furnace

Abstract

The application relates to a top-pulling continuous casting furnace, which comprises a smelting furnace, a super-cooler and an intelligent pulling system, the intelligent pulling system comprises a pulling frame, a driving assembly and electrical communication, the pulling frame is provided with upper pulling shafts, lower pulling shafts and fixed clamping seats on the front and back sides, and the super-cooler is installed in front of the fixed clamping seat and is baked through a baking device. The whole top-pulling casting is operated and controlled through a central touch type operation control screen, higher automation degree and lower operation cost can be realized, the operation efficiency is higher, the service life is longer, the continuous casting machining production of higher requirement alloy billets can be adapted, especially the continuous casting production of large-size alloy containing volatile elements, such as the continuous casting production of large-size Cu-Mg alloy with a wire diameter of 30 mm, Cu-Cr (0.5-0.6%) -Zr (0.1%) alloy.

Description

Technical Field

[0001] This invention relates to the field of copper alloy production technology, specifically to an upward continuous casting furnace. Background Technology

[0002] With industrial development, customers demand higher levels of automation and lower operating costs for upward continuous casting furnaces, resulting in higher operating efficiency and longer service life. This allows them to adapt to the continuous casting production of alloy billets with higher requirements, especially the continuous casting production of large-size alloys containing volatile elements, such as the continuous casting production of large-size Cu-Mg alloys and Cu-Cr(0.5-0.6%)-Zr(0.1%) alloys with a wire diameter of up to 30mm.

[0003] Traditionally, continuous casting furnaces have the following drawbacks:

[0004] 1. In traditional furnace linings, the silicates in the quartz sand material readily react with alloys at high temperatures. The resulting compounds adhere to the furnace walls, bottom, and molten grooves, reducing the induced current. Currently, only a graphite protective sleeve is added to the molten groove lining. However, in practical use, it has been found that because smelting is a closed-loop process, only the "feet" of the furnace are protected, not the "body." The lining at the bottom of the furnace is not protected, leading to severe wear and tear on the graphite protective sleeve, reducing the overall lifespan of the furnace, and hindering improvements in the quality of the alloy guide rods. If the furnace is newly commissioned, it needs to be kept warm for several days to sinter the quartz sand lining material before production can begin, and the sintering properties are difficult to control. All of these factors contribute to decreased smelting efficiency, numerous defects in the quality of the upper alloy guide rods, poor alloy content stability, and ultimately, furnace failure and a short lifespan.

[0005] 2. When the furnace is being converted or shut down, the molten copper alloy inside the furnace must be drawn up and extracted. Only after the copper is completely extracted can the furnace be switched to casting other alloy billets or shut down. Drawing up the copper results in low work efficiency, large amount of waste, and high cost.

[0006] 3. The existing upward continuous casting crystallizer has the following defects: low circulating cooling water pressure and insufficient cooling; large amount of scale on the inner copper tube wall, which easily blocks the outlet space; large grains, compositional segregation, and poor surface quality of the upward continuous casting; slow casting speed and low output; the graphite mold and the middle copper tube are connected by threads, which causes cracks and fissures in the primary cooling zone of the crystallizer, i.e., at the external thread interface of the graphite mold, which seriously affects the internal quality of the upward casting rod.

[0007] 4. The method for drying the top of the crystallizer is as follows: Before the top is installed, place the crystallizer head, which has been tested and installed, in a heat-insulating furnace for baking. Because it is in an open space, the baking time is long and the area is limited, so it cannot be completely and evenly dried, reducing production efficiency. Quality defects caused by incomplete drying: ① The moisture-containing sealant reacts rapidly with the copper phosphorus sheet, splashing and forming slag, lumps, and adhering to the mold, which is then carried into the flowing high-temperature copper liquid, making operation unsafe; ② The tight connection between the top graphite mold thread and the brass base at the lower end of the crystallizer will cause vertical cracks at the mold thread due to the temperature change caused by the moisture-containing sealant coming into contact with the high-temperature copper liquid; ③ When using a cracked mold for continuous casting, the surface quality of the derrick is poor, with cracks and fissures, which in severe cases may prevent top casting or even render the casting unusable.

[0008] Based on this, traditional continuous casting furnaces cannot meet these requirements in terms of output or quality. They are safer and more environmentally friendly, and can effectively reduce the labor intensity and danger of workers, thus putting the people-oriented concept into practice. Summary of the Invention

[0009] The purpose of this invention is to overcome the above-mentioned shortcomings and provide an upward continuous casting furnace. The overall upward casting is operated and controlled by a central touch screen, which can achieve a higher degree of automation, lower operating costs, higher operating efficiency, and longer service life. It can adapt to the continuous casting production of alloy billets with higher requirements, especially the continuous casting production of large-size alloys containing volatile elements, such as the continuous casting production of large-size Cu-Mg alloys and Cu-Cr(0.5-0.6%)-Zr(0.1%) alloys with a wire diameter of up to 30mm.

[0010] The objective of this invention is achieved as follows:

[0011] An upward continuous casting furnace includes a smelting furnace, an ultracooler, and an intelligent traction system. The intelligent traction system includes a traction frame, a drive assembly, and electrical communication. The traction frame is provided with an upper traction shaft, a lower traction shaft, and a fixed bracket on both the front and rear sides. The ultracooler is installed in front of the fixed bracket and is baked by a baking device.

[0012] The smelting furnace includes an induction furnace body, a quartz sand lining cast on the side walls and bottom of the induction furnace body, a graphite protective sleeve for the molten groove, graphite bricks laid on the bottom lining, openings provided on the graphite bricks, and a graphite unloading valve provided on the side wall of the furnace chamber of the induction furnace body.

[0013] The ultracooler includes an inner copper tube, a middle copper tube, an outer steel tube, and a graphite crystallization mold. The inner copper tube is fitted with a graphite sleeve, and the bottom of the inner copper tube has a conical end. One end of the graphite crystallization mold has a conical end that matches the conical end of the inner copper tube, and the other end is screwed with a graphite cap. The bottom of the middle copper tube is provided with multiple rows of holes. A ring-shaped water inlet cavity is formed between the outer steel tube and the middle copper tube and communicates with the water inlet. The water inlet is provided with a graphite mesh.

[0014] The baking device includes a drying chamber, which is equipped with a blower, a heating grid and graphite tubes. The graphite tubes are arranged in two vertical rows in a triangular shape and embedded in the middle of the drying chamber to form a graphite tube group. The drying chamber has heating ports corresponding to each graphite tube. The heating grid is symmetrically arranged on both sides of the graphite tube group. Two blowers are symmetrically fixed to the side wall of the drying chamber. The blowers blow the heat from the heating grid into the graphite tubes.

[0015] Preferably, the main body of the induction furnace column is provided with molding bricks. The molding bricks in the middle divide the furnace chamber into three parts: a smelting chamber, a purification chamber, and a heat preservation chamber. The traction frame is set above the heat preservation chamber. The outer sides of the molding bricks on both sides are in contact with the side furnace lining, and the bottom of the molding bricks is in contact with the graphite bricks.

[0016] Preferably, the conical end of the inner copper tube is hot-pressed to fit the conical end of the graphite crystallization mold.

[0017] Preferably, a fixed bracket is provided outside the drying oven. The fixed bracket is triangular in shape, and fixed clips are evenly distributed along both sides of the fixed bracket. Each fixed clip corresponds to a graphite tube opening.

[0018] Preferably, the upper traction shaft is provided with upper traction rollers at intervals, the lower traction shaft is provided with lower traction rollers at intervals, the fixed bracket is disposed below the lower traction rollers, the fixed bracket fixes the supercooler, and the upper and lower traction shafts on one side are synchronously driven by a drive assembly.

[0019] Preferably, the drive assembly has two parts, which respectively provide driving force to the traction shafts on both sides of the traction frame. The servo control line interface of the drive assembly is electrically connected to the drive controller. The drive controller controls the two motors to rotate synchronously, so as to realize the synchronous upward traction of the continuous casting billet at each traction position.

[0020] The beneficial effects of this invention are:

[0021] 1. The smelting furnace is equipped with a graphite protective sleeve for the melting groove and graphite bricks to protect the quartz sand of the furnace lining of the "furnace foot" and "furnace body". There is no "floating sand" in the copper liquid, the wear of the graphite protective sleeve for the melting groove is reduced, the sintering of the furnace lining does not have to wait, the smelting efficiency is high, the quality defects of the upper drawing alloy rod are few, the alloy stability is high, the furnace life is long, economic costs are saved, and product quality and productivity are improved.

[0022] The discharge valve made of graphite material greatly facilitates the removal of molten copper alloy from the furnace during the furnace converter or when the furnace is shut down, eliminating the need for prolonged upward extraction of the molten copper and avoiding the scrapping of the scrap extraction rod. Now, the molten copper in the furnace can be quickly cleaned through the discharge valve and can be fully reused. It is highly efficient, produces little waste, and has low waste, greatly saving production costs.

[0023] 2. The supercooler is equipped with a graphite filter screen at the water inlet of the outer steel pipe to filter impurities in the circulating cooling water and pressurize the incoming water; a handle is provided on the outer steel pipe wall to facilitate safe loading and unloading of the supercooler by furnace operators.

[0024] Multiple rows of holes are installed at the bottom of the copper tube to increase the water pressure in the primary cooling zone and increase the flow rate, thereby enhancing the cooling of the primary cooling zone.

[0025] A segmented graphite sleeve is installed on the surface of the inner copper tube to increase the secondary cooling area; prevent scale and corrosion from forming on the outer wall of the inner copper tube; and extend the life of the crystallizer.

[0026] A conical opening is set at the bottom of the inner copper tube to connect with a conical crystallizing graphite mold. The conical shape increases the cooling area. Without the traditional threaded groove, the casting cooling and crystallization are uniform. The alloy content inside the billet is stable and there is no segregation. Cooling is sufficient. The electromechanical properties of the billet are stable. The conical connection allows for seamless connection between the upward continuous casting and the inner copper tube. It is suitable for upward vertical casting technology.

[0027] 3. Insert the head of the ultracooler that needs to be baked into the graphite tube opening of the drying oven. The drying oven heats the embedded graphite tube, thereby continuously, evenly and completely baking and drying the copper tube connecting mold and sealant inside the crystallizer in the sealed graphite tube. Utilizing the unparalleled characteristics of graphite material, such as good heat transfer, high temperature resistance, good lubricity, acid and alkali resistance, strong chemical stability and low coefficient of thermal expansion, the baking time is short, the entire part is baked and dried evenly, which is convenient to operate, improves the life of the upper drawing mold, production efficiency, and avoids quality defects such as vertical cracks in the mold's primary cooling zone leading to cracks, fissures, drawing stoppage or even scrap of the copper alloy upper drawing continuous casting rod. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 This is a schematic diagram of the drive assembly.

[0030] Figure 3 This is a schematic diagram of the traction frame.

[0031] Figure 4 This is a schematic diagram of the smelting furnace.

[0032] Figure 5 This is a schematic diagram of the structure of the graphite protective sleeve for the molten groove.

[0033] Figure 6This is a schematic diagram of the structural principle of a graphite unloading valve.

[0034] Figure 7 This is a schematic diagram of the ultracooler.

[0035] Figure 8 for Figure 7 A magnified view of a portion of the image.

[0036] Figure 9 This is a schematic diagram of the outer steel pipe structure.

[0037] Figure 10 for Figure 9 Side view.

[0038] Figure 11 This is a schematic diagram of the structure of the copper tube.

[0039] Figure 12 This is a schematic diagram of the inner copper tube.

[0040] Figure 13 This is a schematic diagram of the structure of a graphite crystallization mold.

[0041] Figure 14 This is a schematic diagram of the baking device.

[0042] Figure 15 This is a schematic diagram of the baking process of the ultracooler.

[0043] The components include: 1. Smelting furnace; 1.1. Quartz sand furnace lining; 1.2. Molded brick; 1.3. Lightweight insulating brick; 1.4. Chrome fiber blanket; 1.5. Induction furnace body; 1.6. Graphite brick; 1.7. Opening; 1.8. Graphite protective sleeve for melting groove; 1.9. Induction coil; 1.10. Water jacket; 1.11. Melting groove; 1.12. U-shaped iron core; 1.13. Support platform; 1.14. Smelting chamber; 1.15. Purification chamber; 1.16. Insulation chamber; 1.17. Graphite discharge valve; 1.17.1. Valve stem; 1.17.2. Positioning pin; 1.17.3. Groove; 1.17.4. Handle; 1.17.5. First discharge hole; 1.17.6. Second discharge hole; 1.17.7. Steel sleeve; 1.18. Asbestos; 1.19.

[0044] 2. Supercooler; 2.1 Cold end convex cap; 2.2 Water outlet; 2.3 Graphite mesh; 2.4 Water inlet; 2.5 Inner copper tube; 2.6 Graphite sleeve; 2.7 Outer steel tube; 2.8 Handle; 2.9 Middle copper tube; 2.10 Graphite protective sleeve; 2.11 Insulation cotton; 2.12 Graphite crystallization mold; 2.13 Graphite cap; 2.14 Threaded opening; 2.15 Conical end of inner copper tube; 2.16 Conical end of graphite crystallization mold; 2.17 Multiple rows of holes; 2.18 Connecting thread; 2.19 Copper liquid hole;

[0045] Baking device 3; Ventilation opening 3.1; Drying oven 3.2; Blower 3.3; Heating grid 3.4; Platform 3.5; Control box 3.6; Thermometer 3.7; Alarm light 3.8; Start button 3.9; Pause button 3.10; Graphite tube 3.11; Fixing clamp 3.12; Bracket 3.13;

[0046] Traction frame 4; upper traction shaft 4.1; lower traction shaft 4.2; fixed bracket 4.3; upper traction roller 4.4; lower traction roller 4.5;

[0047] 5. Drive assembly; 5.1 Motor; 5.2 Servo control line interface; 5.3 Gearbox; 5.4 Upper drive wheel; 5.5 Lower drive wheel; 5.6 Synchronous belt;

[0048] 6. Unloading box; 7. PLC; 8. Servo driver; 9. Control panel; 10. Thermocouple assembly. Detailed Implementation

[0049] See Figure 1 This invention relates to an upward continuous casting furnace, comprising a smelting furnace 1, an ultracooler 2, and an intelligent traction system. The intelligent traction system includes a traction frame 4, a drive assembly 5, and electrical communication. The electrical communication includes a PLC 7, a servo driver 8, a control panel 9, and a thermocouple assembly 10. The thermocouple assembly 10 is inserted into the smelting furnace 1, and the thermocouples are electrically connected to the servo driver 8 to monitor the furnace temperature.

[0050] like Figure 1 and Figure 3 The traction frame 4 is provided with an upper traction shaft 4.1, a lower traction shaft 4.2 and a fixed bracket 4.3 on both the front and rear sides. The upper traction shaft 4.1 is provided with upper traction rollers 4.4 at intervals, and the lower traction shaft 4.2 is provided with lower traction rollers 4.5 at intervals. The fixed bracket 4.3 is located below the lower traction rollers 4.5. The upper traction shaft 4.1 and the lower traction shaft 4.2 on one side are synchronously driven by a drive assembly 5.

[0051] like Figure 1 and Figure 2 The drive assembly 5 includes a motor 5.1, a servo control line interface 5.2, a gearbox 5.3, an upper drive wheel 5.4, a lower drive wheel 5.5, and a synchronous belt 5.6. The motor 5.1 drives the gearbox 5.3. The output shaft of the gearbox 5.3 and the upper and lower drive wheels 5.4 and 5.5 are transmitted via the synchronous belt 5.6. The upper and lower drive shafts corresponding to the upper and lower drive wheels 5.4 and 5.5 are connected to the upper and lower traction shafts 4.1 and 4.2 via couplings. The PLC7 instructs the servo controller 8 to control the motor 5.1, thereby braking the upper and lower traction shafts 4.1 and 4.2. The traction frame 4 has 8 traction positions on one side. Each traction position is equipped with an upper traction roller 4.4, a lower traction roller 4.5, and a fixed bracket 4.3. The fixed bracket 4.3 is used to vertically fix the supercooler 2.

[0052] The drive assembly 5 has two parts, which respectively provide driving force to the traction shafts on both sides of the traction frame 4.

[0053] The servo control line interface 5.2 of the drive assembly 5 is electrically connected to the drive controller 8. The drive controller 8 controls the two motors 5.1 to rotate synchronously, so as to realize the synchronous upward traction of the continuous casting billet at each traction position.

[0054] like Figure 4-6 The smelting furnace 1 includes an induction furnace body 1.5, a graphite discharge valve 1.17, and a support platform 1.13. A discharge box 6 is provided outside the smelting furnace 1, which is matched with the graphite discharge valve 1.17. The induction furnace body 1.5 includes a furnace chamber, a quartz sand lining 1.1, and electrical equipment. The quartz sand lining 1.1 is cast into the side walls and bottom of the induction furnace body 1.5. The furnace chamber is located at the upper part of the induction furnace body 1.5, and the electrical equipment is located at the lower part of the induction furnace body 1.5. The electrical equipment includes an induction coil 1.9, a water jacket 1.10, a molten groove 1.11, and a U-shaped iron core 1.12. The molten groove 1.11, water jacket 1.10, and induction coil 1.9 are arranged sequentially from the outside to the inside within the furnace bottom lining, and the U-shaped iron core 1.12 is provided outside the furnace bottom lining.

[0055] The molten groove 1.11 is provided with a molten groove graphite protective sleeve 1.8, which protects the molten groove. The molten groove graphite protective sleeve 1.8 is provided with a molten groove placement groove corresponding to the molten groove 1.11. The molten groove is made of oxygen-free copper rod.

[0056] Graphite bricks 1.6 are laid on the furnace bottom lining, and openings 1.7 are provided on the graphite bricks 1.6. The graphite bricks 1.6 are laid on the furnace bottom lining using graphite cement. The size and position of the openings 1.7 correspond to the size and position of the upper opening of the melting groove. The graphite bricks 1.6 protect the furnace body.

[0057] The centrally located molded brick 1.2 divides the furnace into three parts: a smelting chamber 1.14, a purification chamber 1.15, and an insulation chamber 1.16. These three chambers are interconnected, and the traction frame 4 is positioned above the insulation chamber 1.16. The outer sides of the molded bricks 1.2 on both sides contact the side furnace lining, and the bottom of the molded bricks 1.2 contacts the graphite bricks 1.6.

[0058] The side fireplace lining is also provided with lightweight insulating bricks 1.3 and chrome fiber blankets 1.4, which have good heat preservation effect.

[0059] The graphite unloading valve 1.17 is installed on the side wall of the furnace chamber of the induction furnace body 1.5. The graphite unloading valve 1.17 includes a valve stem 1.17.1, a valve cap 1.17.2, and a positioning pin 1.17.3. All three components are made of graphite. The valve cap 1.17.2 is fitted onto the bottom of the valve stem 1.17.1. The valve stem 1.17.1 and valve cap 1.17.2 are connected by the positioning pin 1.17.3. The valve stem 1.17.1 has a groove 1.17.4 circumferentially corresponding to the positioning pin 1.17.3. 7.1 The head is provided with a handle 1.17.5, the valve stem 1.17.1 is provided with a first discharge hole 1.17.6 inside, and the valve cap 1.17.2 is provided with a second discharge hole 1.17.7. The first discharge hole 1.17.6 and the second discharge hole 1.17.7 are both eccentric holes. When discharge is required, the handle 1.17.5 is turned to connect the first discharge hole 1.17.6 and the second discharge hole 1.17.7, and the graphite discharge valve is opened; when discharge is not required, the handle 1.17.5 is turned to disconnect the first discharge hole 1.17.6 and the second discharge hole 1.17.7, and the graphite discharge valve is closed.

[0060] The induction furnace body 1.5 is provided with a steel sleeve 1.18 corresponding to the graphite unloading valve 1.17. The steel sleeve 1.18 is located at the bottom side of the furnace chamber. The graphite unloading valve 1.17 is installed inside the steel sleeve 1.18. The head of the valve stem 1.17.1 extends out of the furnace chamber. The gap between the graphite unloading valve 1.17 and the steel sleeve 1.18 is filled with asbestos 1.19.

[0061] The steel sleeve 1.18 is cast into the side wall of the quartz sand furnace lining 1, and the head of the valve stem 1.17.1 passes through the lightweight insulating brick 1.3 and the chromium fiber blanket 1.4 in sequence before extending out of the induction furnace body 1.5.

[0062] The support platform 1.13 is composed of a base plate and legs, and the base plate supports the induction furnace body 1.5.

[0063] The induction furnace is rectangular. When the whole piece of electrolytic copper is added, the heat dissipation area of ​​the furnace is not increased. The area is divided into a smelting zone, a heat preservation zone, and a purification zone. When building the furnace, high-purity graphite protective material is set on the quartz sand furnace lining. Graphite bricks are first laid on the bottom lining of the furnace with graphite cement and molten grooves are opened. The molten material in the molten groove is equipped with a graphite protective sleeve for the molten groove. Then, shaped bricks are built on the graphite bricks to reinforce the graphite bricks and divide the furnace into zones. After high-purity electrolytic copper is added to the smelting zone, the furnace charge is subjected to induced current and alternating electromagnetic fields. The intense agitation inside the molten groove drives the temperature exchange of the copper liquid, generating eddy currents for heating and melting. The molten copper liquid slowly flows into the purification zone, which not only helps stabilize the temperature and liquid level, but also allows the copper liquid to be fully reduced in the purification zone. Furthermore, impurities can be easily removed in the purification zone, ensuring that the copper liquid entering the heat preservation zone has a uniform temperature and is free of impurities. The copper liquid in the heat preservation zone is covered with natural graphite flakes, mainly to isolate oxygen. The temperature of the copper liquid in the heat preservation zone is measured by ceramic silver thermocouples, and the temperature of the copper liquid is controlled by adjusting the input power of the furnace's induction coil.

[0064] The discharge valve, made of graphite material, is placed in the bottom side steel sleeve of the insulated furnace chamber of the induction furnace body. The gap between the valve and the graphite valve is filled with asbestos. The steel sleeve protects the graphite valve and facilitates the discharge operation. The asbestos filling the gap prevents the graphite valve from breaking due to the thermal expansion of graphite at high temperatures. The positioning pin is inserted into the rectangular groove to connect the valve stem and the valve cap. By rotating the handle of the valve stem, the valve stem orifice is aligned with the valve cap orifice, thus allowing the alloy copper liquid to pass through, or, depending on the situation, preventing it from passing through.

[0065] like Figure 7-13 The supercooler 2 includes an inner copper tube 2.5, a middle copper tube 2.9, an outer steel tube 2.7, and a graphite crystallization mold 2.12. The inner copper tube 2.5 is fitted with a graphite sleeve 2.6, which is multi-sectioned. The bottom of the inner copper tube 2.5 has a conical end 2.15. One end of the graphite crystallization mold 2.12 has a graphite crystallization mold conical end 2.16 that matches the conical end 2.15 of the inner copper tube, and the other end is screwed with a graphite cap 2.13 via a connecting thread 2.18. The graphite cap 2.13 has a copper liquid hole 2.19. The inner copper tube... The conical end 2.15 and the conical end 2.16 of the graphite crystallization mold are hot-pressed together. The connection area between the conical end 2.15 of the inner copper tube and the conical end 2.16 of the graphite crystallization mold is the primary cooling (crystallization) zone. The upper part of the primary cooling zone is the secondary cooling zone. The top and bottom of the outer steel tube 2.7 are provided with threaded openings 2.14. The top of the outer steel tube 2.7 is threadedly connected to the top of the middle copper tube 2.9. The bottom of the middle copper tube 2.9 is provided with multiple rows of holes 2.17. The bottom of the inner copper tube 2.5 extends outward with a rim. The bottom of the outer steel tube 2.7 is threadedly connected to the rim of the bottom of the inner copper tube 2.5.

[0066] The bottom of the inner copper tube 2.5 is provided with a graphite protective sleeve 2.10. The upper part of the inner copper tube 2.5 is positioned by a cold end convex cap 2.1. The outer steel tube 2.7 and the middle copper tube 2.9 form an annular water inlet cavity that communicates with the water inlet 2.4. The water inlet 2.4 is provided with a graphite mesh 2.3. The middle copper tube 2.9 and the inner copper tube 2.5 form a circulating cooling cavity that communicates with the water outlet 2.2.

[0067] The outer steel pipe 2.7 is equipped with a handle 2.8 to facilitate the safe loading and unloading of the supercooler by furnace operators.

[0068] The outer steel pipe 2.7 is made of heat-resistant alloy steel.

[0069] An assembly process for an ultracooler used in upward continuous casting includes the following steps:

[0070] Step 1: Securely clamp the 2.7mm outer steel pipe into the bench vise;

[0071] Step 2: Remove the cold end convex cap 2.1, and put each graphite sleeve 2.6 onto the outer wall of the inner copper tube 2.5 one by one, adjusting the dimensional fit between the graphite sleeve 2.6 and the inner copper tube 2.5 wall;

[0072] Step 3: After the outer steel pipe 2.7, the middle copper pipe 2.9 and the inner copper pipe 2.5 are installed, reinstall the cold end convex cap 2.1;

[0073] Step 4: Make graphite crystallization mold 2.12. One end of graphite crystallization mold 2.12 is set with a tapered end, and the other end is set with external threads;

[0074] Step 5: Hot-press the graphite crystallization mold 2.12 with the inner copper tube 2.5;

[0075] Step 6: After pressing and fitting, install the heat insulation protective layer on the hot end of the inner copper tube; wrap the inner copper tube 2.5 with the heat insulation cotton 2.11, and press the graphite protective sleeve 2.10 through the graphite crystallization mold 2.12 and press it on the outside of the heat insulation cotton 2.11; use graphite putty to fill the gap between the graphite crystallization mold 2.12 and the graphite protective sleeve 2.10, and use a scraper to push the graphite putty into the gap to completely seal it.

[0076] Step 7: Tighten the graphite cap 2.13 with the copper liquid hole 2.19 to the external thread of the graphite crystallization mold 2.12. The supercooler assembly is now complete.

[0077] After the supercooler is completed, it can be pressure tested and baked before being fixed to the continuous casting traction frame 4 by symmetrical protrusions set on the outer steel pipe 2.7.

[0078] In the fifth step, before pressing the graphite crystallization mold 2.12 and the inner copper tube 2.5 together, the surface to be pressed together is polished to improve its smoothness. The hot end of the inner copper tube 2.5 is cleaned with fine sandpaper, that is, the inner hole of the conical end of the inner copper tube is polished to remove any debris or waste that may have been left over from the previous casting process. Then, the conical end 2.16 of the graphite crystallization mold is inserted into the conical end of the inner copper tube, and pushed inward while rotating. Then, it is rotated out in the same direction. The raised parts on the outer surface of the withdrawn conical end 2.16 of the graphite crystallization mold will be in a high-gloss state. These raised parts are carefully polished away with a fine sandpaper. This operation is repeated until a good polished mating surface is obtained. The surface of the inserted section of the graphite crystallization mold 2.12 after polishing is uniformly bright, but care should be taken not to over-polish.

[0079] The hot press uses boiling water to heat the supercooler. Hot water is injected into the operation or configuration of water heaters, water pumps, and water pipes through the inlet 2.4 using a kettle. When the surface of the cooler is heated to a suitable temperature, the graphite crystallization mold 2.12 can be inserted and installed. The graphite crystallization mold 2.12 is slowly pushed into the head of the hot end, keeping it in a straight line.

[0080] By installing a graphite filter screen at the inlet of the outer steel pipe to filter impurities in the cooling circulating water and pressurize the incoming water, and by designing a handle on the outer steel pipe wall to facilitate safe loading and unloading of the upper continuous casting supercooler by furnace operators, the cooling water is pressurized a second time by setting multiple rows of holes at the bottom of the middle copper pipe, while also enhancing the cooling and crystallization of the primary cooling zone. By installing a segmented graphite sleeve on the surface of the inner copper pipe to protect the surface of the inner copper pipe from scale and corrosion, the cooling area of ​​the secondary cooling zone is increased, enhancing cooling and ensuring the cooling effect of the secondary cooling zone. The conical opening at the bottom of the inner copper pipe is connected to the conical opening of the crystallization graphite mold, increasing the cooling area of ​​the primary cooling crystallization zone, providing sufficient cooling and uniform cooling of the crystallization zone, maintaining stable alloy content and no segregation in the cast billet, and ensuring stable electromechanical properties. At the same time, by utilizing the upper continuous casting principle, the crystallization mold and the cooling inner copper pipe can achieve a seamless connection during the casting process, ensuring the surface and performance quality of the billet.

[0081] like Figure 14 and Figure 15After the supercooler undergoes pressure testing, its hot end is baked using a baking device 3. The baking device 3 includes a control box 3.6, a drying chamber 3.2, and a fixing bracket 3.13. The control box 3.6 is equipped with a temperature gauge 3.7, an alarm light 3.8, a start button 3.9, and a pause button 3.10 to control the operation of the drying chamber 3.2 system. The drying chamber 3.2 is equipped with a blower 3.3, a heating grid 3.4, and graphite tubes 3.11. The graphite tubes 3.11 and the heating grid 3.4 are placed inside the drying chamber. The graphite tubes 3.11 are arranged in a triangular shape and embedded in the middle of the drying chamber 3.2 to form a graphite tube group. The drying chamber 3.2 has heating ports corresponding to each graphite tube 3.11. Utilizing the unparalleled characteristics of graphite material, such as good heat transfer, high temperature resistance, good lubricity, acid and alkali resistance, strong chemical stability, and low coefficient of thermal expansion, the connecting mold and sealant of the supercooler 2 are continuously, uniformly, and completely baked and dried.

[0082] The heating mesh 3.4 is symmetrically arranged on both sides of the graphite tube assembly and maintained at a certain distance. Two blowers 3.3 are symmetrically fixed to the side walls of the drying chamber 3.2. The blowers 3.3 blow the heat from the working heating mesh 3.4 into the graphite tube 3.11 in the middle of the drying chamber 3.2, forming an internal heat circulation to continuously and evenly heat the graphite tube 3.11. The heating mesh 3.4 is designed to heat up quickly and distribute heat evenly. The top of the drying chamber is provided with a vent 3.1, which is used to release the pressure oversaturation of the drying chamber 3.2.

[0083] A fixed bracket 3.13 is provided outside the drying oven. The fixed bracket is triangular in shape to facilitate workers to pick up and put down the crystallizer. Fixed clamps are evenly distributed along both sides of the fixed bracket, and each fixed clamp corresponds to a graphite tube opening.

[0084] The bottom of the drying oven 3.2 is provided with a platform 3.5, which is set in a cone shape to prevent slipping, prevent shock, support and fix the baking device.

[0085] The fixing clip 3.12 is used to fix the ultracooler 2, so that the crystallizer head can be connected to the graphite tube 3.11 in a straight loop.

[0086] Insert the head of the crystallizer that needs to be baked into the graphite tube opening. Heat the embedded graphite tube through the drying oven to continuously, evenly and completely bake and dry the copper tube connecting mold and sealant inside the sealed graphite tube. Utilizing the unparalleled characteristics of graphite material, such as good heat transfer, high temperature resistance, good lubricity, acid and alkali resistance, strong chemical stability and low coefficient of thermal expansion, the baking time is short, the entire part is baked and dried evenly, and the operation is convenient.

[0087] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. A top-drawing continuous casting furnace, characterized in that: It includes a smelting furnace, a supercooler, and an intelligent traction system. The intelligent traction system includes a traction frame, a drive assembly, and electrical communication. The traction frame is equipped with an upper traction shaft, a lower traction shaft, and a fixed bracket on both the front and rear sides. The supercooler is installed in front of the fixed bracket and is baked by a baking device. The smelting furnace includes an induction furnace body, a quartz sand lining cast on the side walls and bottom of the induction furnace body, a graphite protective sleeve for the molten groove, graphite bricks laid on the bottom lining, openings provided on the graphite bricks, and a graphite unloading valve provided on the side wall of the furnace chamber of the induction furnace body. The ultracooler includes an inner copper tube, a middle copper tube, an outer steel tube, and a graphite crystallization mold. The inner copper tube is fitted with a graphite sleeve, and the bottom of the inner copper tube has a conical end. One end of the graphite crystallization mold has a conical end that matches the conical end of the inner copper tube, and the other end is screwed with a graphite cap. The bottom of the middle copper tube is provided with multiple rows of holes. A ring-shaped water inlet cavity is formed between the outer steel tube and the middle copper tube and communicates with the water inlet. The water inlet is provided with a graphite mesh. The baking device includes a drying chamber, which is equipped with a blower, a heating grid and graphite tubes. The graphite tubes are arranged in two vertical rows in a triangular shape and embedded in the middle of the drying chamber to form a graphite tube group. The drying chamber is provided with heating ports corresponding to each graphite tube. The heating grid is symmetrically arranged on both sides of the graphite tube group. Two blowers are symmetrically fixed to the side wall of the drying chamber. The blowers blow the heat from the heating grid into the graphite tubes. The graphite unloading valve includes a valve stem, a valve cap, and a positioning pin. The valve cap is fitted onto the bottom of the valve stem. The valve stem and the valve cap are connected by the positioning pin. The valve stem has a groove on its circumference corresponding to the positioning pin. The valve stem head has a handle. The valve stem has a first unloading hole inside. The valve cap has a second unloading hole. Both the first unloading hole and the second unloading hole are eccentric holes. The induction furnace body is provided with a steel sleeve corresponding to the graphite unloading valve. The steel sleeve is set at the bottom side of the furnace chamber. The graphite unloading valve is installed inside the steel sleeve, and the head of the valve stem extends out of the furnace chamber. The gap between the graphite unloading valve and the steel sleeve is filled with asbestos. The conical end of the inner copper tube is hot-pressed to fit the conical end of the graphite crystallization mold.

2. The upward continuous casting furnace according to claim 1, characterized in that: The main body of the induction furnace column is equipped with molding bricks. The molding bricks in the middle divide the furnace chamber into three parts: the smelting chamber, the purification chamber, and the heat preservation chamber. The traction frame is set above the heat preservation chamber. The outer sides of the molding bricks on both sides are in contact with the side furnace lining, and the bottom of the molding bricks is in contact with the graphite bricks.

3. The upward drawing continuous casting furnace according to claim 1, characterized in that: The conical end of the inner copper tube is hot-pressed to fit the conical end of the graphite crystallization mold.

4. The upward drawing continuous casting furnace according to claim 1, characterized in that: A fixed bracket is provided outside the drying oven. The fixed bracket is triangular in shape, and fixed clips are evenly distributed along both sides of the fixed bracket. Each fixed clip corresponds to a graphite tube opening.

5. The upward drawing continuous casting furnace according to claim 1, characterized in that: The upper traction shaft is provided with upper traction rollers at intervals, and the lower traction shaft is provided with lower traction rollers at intervals. The fixed bracket is located below the lower traction rollers and fixes the supercooler. The upper and lower traction shafts on one side are synchronously driven by a drive assembly.

6. The upward drawing continuous casting furnace according to claim 5, characterized in that: The drive assembly has two parts, which provide driving force to the traction shafts on both sides of the traction frame respectively. The servo control line interface of the drive assembly is electrically connected to the drive controller. The drive controller controls the two motors to rotate synchronously, so as to realize the synchronous upward traction of the continuous casting billet at each traction position.

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