Sectional type combined blowing assembly, AOD refining furnace and using method of sectional type combined blowing assembly and AOD refining furnace

Abstract

The invention belongs to the technical field of metallurgical equipment, particularly relates to a sectional type combined blowing assembly, an AOD (Argon Oxygen Decarburization) refining furnace and a use method of the sectional type combined blowing assembly, and solves the problems that an existing AOD air hole is easy to scrap, difficult to connect and disassemble, low in air suction efficiency of a dust hood, inaccurate in gas blowing control and easy to flow backwards. Stable connection is achieved through an extrusion rod, a sliding rod and the like, temperature sensing paraffin is expanded to be further reinforced through the furnace temperature, a conical rotating core is arranged in a horn mouth, mixed gas is spirally sprayed out, and molten steel backward flowing is delayed. The AOD refining furnace is provided with three sectional type combined blowing assemblies, a furnace body is provided with a dust hood, and a lifting part rotates along with the furnace body to drive the dust hood to ascend and descend. And the smoke is discharged without leakage.

Description

Technical Field

[0001] This invention relates to the field of metallurgical equipment technology, and in particular to a segmented combined blowing assembly and an AOD refining furnace and its usage method. Background Technology

[0002] The AOD refining furnace is a key piece of equipment in stainless steel smelting. Its core function is to introduce a mixture of oxygen and inert gas into the furnace through a combined blowing assembly to achieve smelting processes such as decarburization and alloying. However, existing combined blowing assemblies have many shortcomings in practical applications.

[0003] 1. The connection between the pneumatic gun barrel and the mounting base relies on a single mechanical fastening structure. The high temperature during furnace operation will cause the components to expand and contract, which can easily cause the connection to loosen, leading to gas leakage and affecting the smelting effect.

[0004] 2. In the event of an unexpected interruption of the gas supply system, molten steel may backflow along the ventilation ducts, damaging the internal structure of the components and increasing maintenance costs;

[0005] 3. When pouring molten metal from the furnace, the dust hood needs to be opened manually, which is not only inefficient, but also prone to causing flue gas leakage and environmental pollution due to untimely operation. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing AOD air vents, such as easy failure, difficulty in connection and disassembly, low suction efficiency of dust hoods, inaccurate gas injection control, and easy backflow. This invention proposes a segmented re-blowing assembly and an AOD refining furnace, as well as its usage method.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A segmented re-blowing assembly, comprising:

[0009] A pneumatic gun barrel with a ventilation channel inside, and a flared mouth at one end of the pneumatic gun barrel that communicates with the ventilation channel;

[0010] The mounting base has a slot on one side for insertion and mating with the pneumatic gun barrel, and the mounting base has multiple sets of fastening parts inside;

[0011] The mounting base has a threaded section on its outer wall and a ring nut is threadedly connected to it through the threaded section. The pneumatic gun barrel has an annular groove on its outer wall located in the slot. The fastening part includes a compression groove and a cylinder, which are used to fasten the pneumatic gun barrel to the mounting base through the cooperation of the annular nut and the annular groove.

[0012] Furthermore, the mixture of oxygen and inert gas is ejected in an umbrella shape through the ventilation duct and the flare.

[0013] In one possible design, the fastening part further includes a sliding rod that mates with the annular groove. The extrusion groove is disposed within the mounting base and communicates with the slot. A movable plate I is slidably connected within the extrusion groove. An extrusion rod is fixed to one end of the movable plate I away from the slot. One end of the extrusion rod extends slidably to the outside of the mounting base. A movable plate II located below the movable plate I is slidably connected within the extrusion groove. A fixed plate located below the movable plate II is fixed within the extrusion groove. A sliding rod that is fixedly connected to the bottom of the movable plate II slidably passes through the fixed plate. The bottom end of the sliding rod extends into the annular groove. The top end of the cylinder is fixedly connected to the bottom of the movable plate I. A piston rod is slidably and sealed within the cylinder. The bottom end of the piston rod is fixedly connected to the top of the movable plate II.

[0014] The extrusion rod pushes the moving plate II and the sliding rod downward through the cooperation of the piston rod and the cylinder, so that the sliding rod abuts against the inner wall of one side of the annular groove, and extrudes the pneumatic gun barrel toward the mounting base, so as to tightly connect the pneumatic gun barrel with the mounting base;

[0015] Furthermore, a return spring is fixed between the bottom of the movable plate II and the top of the fixed plate via a spring seat, and the return spring is sleeved on the outer wall of the sliding rod to move the movable plate II upward and reset.

[0016] In one possible design, the fastening part further includes an L-shaped copper rod fixed in the mounting base. One end of the L-shaped copper rod extends fixedly into the extrusion groove, and the other end of the L-shaped copper rod extends fixedly into the slot and is fixed with a spring plate. The spring plate is made of copper and abuts against the outer wall of the pneumatic gun barrel to conduct the furnace temperature on the pneumatic gun barrel to the L-shaped copper rod.

[0017] A heat-conducting copper rod is fixedly inserted through the outer wall of the cylinder. A temperature-sensitive paraffin is stored between the top of the piston rod and the top inner wall of the cylinder. The heat-conducting copper rod extends into the temperature-sensitive paraffin to conduct the furnace temperature to the temperature-sensitive paraffin and cause the temperature-sensitive paraffin to expand and push the piston rod and sliding rod downward.

[0018] A heat-conducting copper sheet is fixed to one side of the cylinder body, and the heat-conducting copper sheet is fixedly connected to one end of the heat-conducting copper rod. The heat-conducting copper sheet slides against one end of the L-shaped copper rod to conduct the temperature on the L-shaped copper rod to the temperature-sensitive paraffin through the heat-conducting copper sheet and the heat-conducting copper rod.

[0019] In one possible design, the top of the extrusion rod has an inclined surface on the side near the annular nut, and the annular nut has a concave surface on the side near the extrusion rod, with the inclined surface cooperating with the concave surface.

[0020] The annular nut moves along the axis of the mounting base by rotating, and the inner concave surface and the inclined surface cooperate to push the moving plate I, cylinder and moving plate II downward as a whole. The pneumatic gun barrel is initially fixed in the mounting base by the cooperation of the sliding rod and the annular groove.

[0021] In one possible design, a ball is rolled into the bottom end of the sliding rod, the inner walls on both sides of the annular groove are inclined, and the ball engages with the inclined surface of the annular groove on the side away from the flared opening.

[0022] During the downward movement of the sliding rod and the ball, the ball abuts against the corresponding inclined surface, causing the pneumatic gun barrel to be pressed towards the mounting base, thereby increasing the connection stability through furnace temperature when the pneumatic gun barrel is running;

[0023] Furthermore, a conical rotating core is rotatably connected inside the horn-shaped opening. The outer wall of the conical rotating core is provided with multiple spiral guide grooves. When a mixture of oxygen and inert gas is injected into the horn-shaped opening through the ventilation duct, the mixture drives the conical rotating core to rotate under the action of the spiral guide grooves, causing the mixture to be spirally ejected. This forces the airflow to generate a centrifugal force and blow it out along the wall, forming an air curtain to protect the refractory bricks.

[0024] An AOD refining furnace includes three of the above-mentioned segmented reblowing components, as well as a furnace body and two bases. An annular sleeve is fixedly sleeved on the outer wall of the furnace body. Rotating shafts are rotatably connected to the sides of the two bases that are close to each other. The sides of the two rotating shafts that are close to each other are fixedly connected to the annular sleeves for driving the furnace body to rotate.

[0025] One end of each of the three pneumatic gun barrels penetrates the inner wall of the furnace body and extends into the furnace body. The three mounting bases are fixed to the outer wall of the furnace body by bolts, and are used to blow different proportions of oxygen and inert gas into the furnace body at different stages of smelting.

[0026] It also includes a dust removal hood installed on the top of the furnace body. The inner wall of the dust removal hood is matched with the outer wall of the furnace opening of the furnace body. The dust removal hood is stuck at the furnace opening position of the furnace body under its own gravity, sealing the furnace body and allowing the flue gas inside the furnace body to be discharged without leakage.

[0027] The top of the dust collector hood is fixedly connected to an air guide pipe, and the air guide pipe is connected to an external bag filter through a corrugated pipe.

[0028] Both of the bases are provided with lifting parts between themselves and the furnace body. These parts are used to drive the dust removal hood to move upward and release the furnace body when the furnace body rotates and pours molten liquid. When the furnace body returns to its vertical position, the dust removal hood is used to seal the furnace opening of the furnace body again.

[0029] In one possible design, the lifting unit includes a drive shaft rotatably mounted on one side of the top of the annular sleeve via a base. A spur gear and a rotating wheel are fixed at both ends of the drive shaft, respectively. An external gear ring is fixed on the side of the base near the furnace body, and the external gear ring is coaxial with the rotating shaft. The spur gear meshes with the external gear ring.

[0030] A motor is fixed to one side of the base via a frame, and the output shaft of the motor is fixedly connected to the rotating shaft via a coupling. This is used to drive the drive shaft to rotate through the engagement of the external gear ring and the spur gear when the furnace body is rotated by the rotating shaft.

[0031] A vertical rod is fixed to the top of the furnace body, and an L-shaped plate is slidably fitted on the outer wall of the vertical rod. One end of the L-shaped plate is fixedly connected to the top of the dust removal hood for driving the dust removal hood to rise and fall.

[0032] A push rod is fixed to one side bottom of the L-shaped plate, a groove is provided on the top of the rotating wheel, and a roller is rotatably provided at the bottom end of the push rod, with the roller cooperating with the inner wall of the groove and the outer wall of the rotating wheel;

[0033] When the drive shaft drives the rotating wheel to rotate, the roller drives the push rod and the dust cover to move upward, thereby releasing the dust cover from sealing the furnace opening.

[0034] In one possible design, the top of the annular sleeve is provided with two clearance grooves, and the clearance grooves are used to make way for the rotating wheel;

[0035] The groove and the rotating wheel are both connected by arc-shaped surfaces to enable the roller to move smoothly at the connection between the groove and the rotating wheel.

[0036] In one possible design, protective covers are fixed to both sides of the annular sleeve. The protective covers are rotatably fitted onto the outer wall of the corresponding drive shaft, and the protective covers abut against one side of the corresponding seat body to protect the external gear ring and spur gear.

[0037] This application discloses a method of using an AOD refining furnace, comprising the following steps:

[0038] S1. Insert the pneumatic gun barrel into the mounting base slot, rotate the ring nut to move axially along the threaded section, its concave surface interacts with the inclined surface of the extrusion rod to generate radial force to push the moving plate I down, and drive the moving plate II to move down synchronously, driving the sliding rod to extend into the annular groove of the pneumatic gun barrel, the ball rolls along the inclined surface to generate axial force, extruding the pneumatic gun barrel and initially fixing it to the mounting base, the moving plate II compresses the return spring to store elastic potential energy, and the mounting base is installed on the outer wall of the furnace body by bolts;

[0039] S2. After the pneumatic gun barrel is inserted into the furnace body, the high temperature inside the furnace is conducted to the temperature-sensitive paraffin wax in the cylinder through the spring plate, L-shaped copper rod, heat-conducting copper plate, and heat-conducting copper rod. The temperature-sensitive paraffin wax expands and pushes the piston rod down, causing the moving plate II to move further down, increasing the squeezing force of the sliding rod on the annular groove, and realizing high-temperature adaptive reinforcement. When cooling, the temperature-sensitive paraffin wax contracts, and the return spring pushes the component to return to its original position, which is convenient for disassembly and maintenance.

[0040] S3. After oxygen and inert gas are mixed in the required proportion, they are transported to the bell mouth through the ventilation duct and come into contact with the spiral guide groove of the conical rotating core. This generates a tangential force to drive the conical rotating core to rotate, while changing the airflow direction to form a spiral airflow. Under the action of centrifugal force, the airflow is sprayed out in an umbrella shape and covers the inner wall of the furnace.

[0041] S4. Fix the three re-blowing component mounting bases to the outer wall of the furnace body with bolts. The dust hood is sealed by gravity at the furnace mouth. The air guide pipe is connected to the bag dust collector through the corrugated pipe to form a flue gas emission channel. The two lifting parts are symmetrically installed on both sides of the top of the annular sleeve to ensure that the dust hood is raised and lowered smoothly.

[0042] S5. The three combined blowing components blow in different proportions of gas according to the needs of the smelting stage. In the initial stage, the proportion of oxygen is increased to accelerate decarburization, and in the middle and later stages, the proportion of argon and nitrogen is increased to promote uniform composition and temperature regulation. The dust hood is kept sealed by gravity, and the flue gas enters the bag dust collector for purification through the air guide pipe.

[0043] S6. When smelting is completed, the motor drives the rotating shaft to tilt the furnace body. The external gear ring drives the spur gear, drive shaft and rotating wheel to rotate. When the roller is misaligned with the groove, the push rod drives the L-shaped plate to move the dust cover upward to release the seal. The furnace body continues to tilt and pour molten steel. After completion, the motor drives the reset, the rotating wheel rotates in the opposite direction, the roller enters the groove, and the dust cover moves downward by gravity to reseal.

[0044] Beneficial effects: In this invention, a dual fastening structure of mechanical pre-tightening and temperature-responsive reinforcement is adopted. The ring nut achieves the initial fixation of the pneumatic gun barrel through the cooperation of the inclined surface and the concave surface. The temperature-sensitive paraffin expands at high temperature, driving the sliding rod to further pressurize, so that the fastening force increases with the furnace temperature, effectively offsetting the risk of loosening caused by thermal expansion and contraction and vibration. The setting of the return spring ensures that the fastening structure can be smoothly reset in the low temperature or shutdown state, which facilitates component disassembly and maintenance and extends the service life of the components.

[0045] In this invention, the spiral guide groove of the conical rotating core causes the mixed gas to form a spiral umbrella-shaped airflow, which not only expands the contact area between the gas and the molten steel and accelerates the smelting reaction rate, but also forms a wall-adhering gas curtain, reducing the scouring and erosion of the refractory layer on the inner wall of the furnace by the molten steel, reducing the consumption of refractory materials. The flow resistance effect of the spiral guide groove can effectively delay the backflow of the backflow medium when the gas supply is interrupted, thus improving the safety of equipment operation.

[0046] In this invention, the rotation of the furnace body and the lifting of the dust hood are synchronized through the meshing transmission of the external gear ring and the spur gear. No additional power is needed to drive the dust hood, which simplifies the equipment structure. The dust hood relies on its own gravity to achieve a seal, which has high sealing reliability. When tilted, it automatically moves upward to avoid the problem, which avoids the cumbersome manual operation and the problem of sealing failure, reduces flue gas leakage, and protects the working environment.

[0047] In this invention, the pneumatic gun barrel is segmented, so the entire barrel does not need to be replaced after the front end is burned, reducing the cost of use. The fastening part uses the principle of mechanical and thermal expansion to ensure a stable connection at high temperatures and easy disassembly. The flared mouth design allows the gas to be ejected in a spiral, protecting the refractory bricks and delaying the backflow of molten steel. The dust collector hood automatically rises and falls with the rotation of the furnace body, improving the suction efficiency, reducing the intake of cold air, and extending the life of the filter bag. Attached Figure Description

[0048] Figure 1 A three-dimensional structural schematic diagram of a segmented re-blowing assembly provided by the present invention;

[0049] Figure 2 This is a cross-sectional structural schematic diagram of a segmented re-blowing assembly provided by the present invention;

[0050] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;

[0051] Figure 4 A three-dimensional structural schematic diagram of the conical rotating core of a segmented reblowing assembly provided by the present invention;

[0052] Figure 5 A three-dimensional cross-sectional exploded view of the pneumatic barrel and conical rotating core of a segmented multiple-blowing assembly provided by the present invention.

[0053] Figure 6 A three-dimensional exploded structural diagram of the moving plate I, sliding rod, and cylinder of a segmented re-blowing assembly provided by the present invention;

[0054] Figure 7 A cross-sectional view of the cylinder body of a segmented re-blowing assembly provided by the present invention;

[0055] Figure 8A three-dimensional structural schematic diagram of an AOD refining furnace provided by the present invention;

[0056] Figure 9 This is a cross-sectional structural schematic diagram of an AOD refining furnace provided by the present invention;

[0057] Figure 10 A three-dimensional exploded structural diagram of the dust hood, furnace body and rotating wheel of an AOD refining furnace provided by the present invention;

[0058] Figure 11 A three-dimensional exploded structural diagram of the rotating wheel, rotating shaft and push rod of an AOD refining furnace provided by the present invention;

[0059] Figure 12 This is a three-dimensional structural diagram of the rotating wheel and push rod of an AOD refining furnace provided by the present invention.

[0060] In the diagram: 1. Pneumatic barrel; 2. Ventilation duct; 3. Mouthpiece; 4. Conical rotating core; 5. Spiral guide groove; 6. Mounting base; 7. Slot; 8. Annular groove; 9. Extrusion groove; 10. Moving plate I; 11. Extrusion rod; 12. Inclined surface; 13. Fixed plate; 14. Sliding rod; 15. Moving plate II; 16. Return spring; 17. Ball bearing; 18. Cylinder; 19. Piston rod; 20. Thermally conductive copper sheet; 21. Thermally conductive copper rod; 22. L-shaped 23. Copper rod; 24. Spring plate; 25. Ring nut; 26. Threaded section; 27. Concave surface; 28. Furnace body; 29. ​​Ring sleeve; 30. Base; 31. Rotating shaft; 32. Vertical rod; 33. Dust hood; 34. Air guide pipe; 35. L-shaped plate; 36. Push rod; 37. Roller; 38. External gear ring; 39. Drive shaft; 40. Spur gear; 41. Rotating wheel; 42. Groove; 43. Clearance groove; 44. Protective cover; 45. Arc-shaped surface. Detailed Implementation

[0061] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0062] In one embodiment: Refer to Figures 1-7A segmented re-blowing assembly, relating to the field of metallurgical equipment technology, mainly consists of two parts: a pneumatic gun barrel 1 and a mounting base 6. The two are detachably fastened together by multiple sets of fastening parts. One end of the pneumatic gun barrel 1 is provided with a bell mouth 3 for realizing the spiral umbrella-shaped injection of the mixed gas. The mounting base 6 is engaged with a ring nut 24 through a threaded section 25 to provide pre-tightening power for the fastening parts. The overall size design of the assembly needs to be adapted to the structure of the furnace body 27 of the AOD refining furnace to ensure that the assembly forms a reasonable spatial layout with the furnace body 27 structure after installation, without interfering with the rotation of the furnace body 27 and the operation of other components.

[0063] Furthermore, refer to Figure 2 and Figure 5 The pneumatic gun barrel 1 is a hollow cylindrical structure with a ventilation channel 2 set inside along the axial direction to ensure that the pressure loss during gas flow is within a reasonable range, meeting the gas flow and injection pressure required for smelting. One end of the pneumatic gun barrel 1 is connected to the ventilation channel 2 and is equipped with a bell mouth 3. The outer diameter of the large end of the bell mouth 3 is 80-120mm, and the inner diameter of the small end is the same as the inner diameter of the ventilation channel 2. The cone angle of the bell mouth 3 is 45-60°. This angle design allows the gas injection to form an umbrella-shaped airflow with a suitable coverage range, taking into account both reaction efficiency and air curtain protection effect.

[0064] Furthermore, refer to Figure 3 and Figure 5 An annular groove 8 is provided on the outer wall of the pneumatic gun barrel 1 near the mounting base 6. The inner walls on both sides of the annular groove 8 are machined into bevels. The bevel on the side away from the flare 3 has an angle of 45-60° with the axis of the pneumatic gun barrel 1. This bevel cooperates with the ball 17 at the bottom of the sliding rod 14 to achieve axial compression and fixation of the pneumatic gun barrel 1.

[0065] Furthermore, refer to Figure 2 The mounting base 6 is a cylindrical structure with a slot 7 on one side along the axial direction. The inner diameter of the slot 7 is matched with the outer diameter of the pneumatic gun barrel 1 to ensure that the pneumatic gun barrel 1 has sufficient connection length after insertion, thereby improving connection stability. The interior of the mounting base 6 is evenly provided with 3-4 sets of fastening parts along the circumference. The included angle between each set of fastening parts is 90-120° to ensure that the fastening force is evenly distributed in the circumference of the pneumatic gun barrel 1, avoiding local stress concentration that could lead to component deformation.

[0066] Furthermore, refer to Figure 2 , Figure 3 and Figure 6The outer wall of the mounting base 6 is provided with a threaded section 25 to ensure smooth engagement with the ring nut 24 and sufficient load-bearing capacity. The inner diameter of the ring nut 24 is adapted to the threaded section 25. A concave surface 26 is provided on the side near the pressing rod 11. The radius of curvature of the concave surface 26 is 50-80mm, which engages with the inclined surface 12 at the top of the pressing rod 11 to realize radial force conversion during rotation. The outer wall of the ring nut 24 is provided with anti-slip texture, which is convenient for operators to rotate manually or with the aid of tools. The interior of the mounting base 6 is provided with a pressing groove 9, which is connected to the slot 7 to ensure smooth sliding of the moving plate I 10 and the moving plate II 15 in the groove. The inner wall of the pressing groove 9 is machined with a precision of Ra0.8-Ra1.6 to reduce frictional resistance during sliding. A fixing plate 13 is fixedly installed at the bottom of the pressing groove 9. The fixing plate 13 is a rectangular steel plate with a through hole at its center. The inner diameter of the through hole is adapted to the outer diameter of the sliding rod 14 to ensure that the sliding rod 14 can pass through flexibly.

[0067] Furthermore, refer to Figure 2 , Figure 3 and Figures 5-7 The fastening part is mainly composed of a pressing rod 11, a moving plate I 10, a cylinder 18, a piston rod 19, a moving plate II, a sliding rod 14, a fixed plate 13, a return spring 16, an L-shaped copper rod 22, a heat-conducting copper sheet 20, a heat-conducting copper rod 21, a spring sheet 23, and temperature-sensitive paraffin wax. The components work together to achieve the fixation of the pneumatic gun barrel 1 and the reinforcement in response to temperature.

[0068] Furthermore, refer to Figure 3 , Figure 6 and Figure 7One end of the extrusion rod 11 is fixedly connected to the moving plate I 10, and the other end slides to the outside of the mounting base 6. The top of the rod, near the annular nut 24, is machined into an inclined surface 12. The angle between the inclined surface 12 and the axis of the extrusion rod 11 is 30-45°, and the surface roughness of the inclined surface 12 is Ra0.8, ensuring smooth contact with the concave surface 26 of the annular nut 24. The top of the cylinder body 18 is fixedly connected to the bottom of the moving plate I 10. The cylinder body 18 has a cylindrical structure, and the inner wall of the cylinder body 18 is machined with a precision of Ra0.4-Ra0.8 to ensure the sealing and sliding of the piston rod 19. The bottom sealing of the piston rod 19 slides through the cylinder body 18, and the bottom end is fixedly connected to the moving plate II 15. The clearance between the piston rod 19 and the cylinder body 18 is 0.02-0.05mm, sealed with a fluororubber sealing ring to prevent leakage of temperature-sensitive paraffin or the entry of external impurities. The moving plate II 15... The bottom is fixedly connected to the top of the sliding rod 14. The bottom end of the sliding rod 14 is fitted with rolling balls 17, which are made of bearing steel with a surface hardness of HRC60-65 to ensure good wear resistance and rolling performance. The connection between the balls 17 and the sliding rod 14 is an interference fit with a fit amount of 0.01-0.03mm to prevent the balls 17 from falling off. The return spring 16 is sleeved on the outer wall of the sliding rod 14, located between the moving plate II 15 and the fixed plate 13. The return spring 16 is a cylindrical helical compression spring with a wire diameter of 1.5-3mm, a spring mean diameter of 12-18mm, a free length of 25-40mm, an elastic coefficient of 8-15N / mm, and a working stroke of 5-10mm. The two ends of the return spring 16 are fixedly connected to the moving plate II and the fixed plate 13 respectively through spring seats. The thickness of the spring seats is 5-8mm to ensure accurate installation and positioning of the spring.

[0069] Furthermore, refer to Figure 3 , Figure 6 and Figure 7The L-shaped copper rod 22 is fixed inside the mounting base 6, with one end extending into the extrusion groove 9 and the other end extending into the slot 7 and fixedly connected to the spring plate 23 to ensure effective temperature conduction. The spring plate 23 is a copper elastic structure, and the free end of the spring plate 23 abuts against the outer wall of the pneumatic gun barrel 1 with a contact pressure of 5-10N to ensure reliable temperature conduction. The heat-conducting copper plate 20 is fixed on one side of the cylinder 18, with one end of the heat-conducting copper plate 20 sliding against the L-shaped copper rod 22 to ensure efficient heat transfer. The heat-conducting copper rod 21 is fixedly inserted through the cylinder. The outer wall of cylinder 18 is fixedly connected at one end to the heat-conducting copper plate 20, and the other end extends into the thermosensitive paraffin wax inside cylinder 18. The heat-conducting copper rod 21 is made of copper to improve thermal conductivity. The thermosensitive paraffin wax is stored between the top of piston rod 19 and the inner wall of the top of cylinder 18, with a filling amount of 60%-70% of the internal volume of cylinder 18. The melting point of thermosensitive paraffin wax is 80-120℃, and the volume expansion coefficient is 0.05-0.08 / ℃, ensuring that sufficient expansion force can be generated within the normal smelting temperature range of furnace 27 to push piston rod 19 downward. The purity of thermosensitive paraffin wax is not less than 99% to avoid impurities affecting its thermal expansion properties.

[0070] Reference Figures 8-12 An AOD refining furnace, relating to the field of metallurgical equipment technology, includes three of the aforementioned segmented reblowing components. It also comprises a furnace body 27, an annular sleeve 28, two bases 29, a rotating shaft 30, a dust collector 32, a gas guide pipe 33, a corrugated pipe, and two lifting parts. The nominal capacity of the furnace body 27 is set to 5-30t according to smelting requirements. The inner diameter of the furnace body 27 is 1500-3000mm, and the height is 2500-4000mm. The inner wall of the furnace body 27 is lined with refractory bricks with a thickness of 300-500mm to ensure it can withstand the high-temperature smelting environment.

[0071] Furthermore, refer to Figure 9 and Figure 11An annular sleeve 28 is fixedly fitted onto the outer wall of the furnace body 27, located in the lower middle part of the furnace body 27. The inner diameter of the annular sleeve 28 is adapted to the outer diameter of the furnace body 27. It is made of welded steel plate to ensure sufficient strength and rigidity. It is used to connect the furnace body 27 and the rotating shaft 30. Two seats 29 are symmetrically arranged on both sides of the furnace body 27. The bottom of the seats 29 is fixed to the foundation by anchor bolts. The specifications of the anchor bolts are M30-M48, and the number is 8-12 to ensure the installation stability of the seats 29. The rotating shaft 30 is rotatably connected to the side of the seats 29 closest to the furnace body 27. The connection between the rotating shaft 30 and the seats 29 is made of rolling bearings. The bearing model is 22230-22240 to ensure smooth rotation of the furnace body 27 and low friction. One end of the rotating shaft 30 is fixedly connected to the annular sleeve 28 by flange connection to ensure connection strength. A motor is fixed to one side of the base 29 via a frame. The output speed is adjusted by a reducer with a transmission ratio of 50-100, so that the rotation speed of the furnace body 27 is controlled at 0.5-2 r / min, which meets the requirements for mixing and pouring molten steel during the smelting process.

[0072] Furthermore, refer to Figure 10 The dust hood 32 is located on top of the furnace body 27 and has a conical structure. Its inner wall is adapted to the outer wall of the furnace opening of the furnace body 27. The cone angle of the dust hood 32 is 90-120° to ensure a tight seal with the furnace opening. The dust hood 32 is made of heat-resistant steel plate with a thickness of 10-15mm. Its inner wall is equipped with a high-temperature resistant sealing gasket made of ceramic fiber with a thickness of 10-20mm to ensure sealing performance and high-temperature resistance. The top of the dust hood 32 is fixedly connected to a gas guide pipe 33, which is made of seamless steel pipe. One end of the gas guide pipe 33 is fixedly connected to the dust hood 32 through a flange, and the other end is connected to the bag filter through a corrugated pipe. The diameter of the corrugated pipe is adapted to the gas guide pipe 33 and is made of stainless steel, which has good flexibility and corrosion resistance, ensuring the sealing and adaptability of the flue gas passage during the rotation of the furnace body 27 and the raising and lowering of the dust hood 32.

[0073] Furthermore, refer to Figure 9 and Figure 10 Two vertical rods 31 are fixed to the top of the furnace body 27. They are evenly distributed around the furnace opening and are made of round steel to ensure smooth sliding of the L-shaped plate 34. One end of the L-shaped plate is slidably fitted onto the outer wall of the vertical rod 31, and the other end is fixedly connected to the top of the dust hood 32. The L-shaped plate is made of welded steel plate. The gap between the L-shaped plate and the vertical rod 31 is 0.5-1mm to ensure smooth lifting without jamming.

[0074] Furthermore, refer to Figures 9-12The lifting unit mainly consists of a drive shaft 38, a spur gear 39, a rotating wheel 40, an external gear ring 37, a push rod 35, a roller 36, and a protective cover 43. Two lifting units are symmetrically installed on both sides of the top of the annular sleeve 28 to ensure balanced force during the lifting process of the dust collector 32. The drive shaft 38 is rotatably connected to one side of the top of the annular sleeve 28 via a base. The two ends of the drive shaft 38 are respectively fixed with a spur gear 39 and a rotating wheel 40. The external gear ring 37 is fixed to the side of the base 29 near the furnace body 27, coaxial with the rotating shaft 30. The module of the external gear ring 37 is the same as that of the spur gear 39, with 80-120 teeth to ensure smooth meshing transmission. A groove 41 is provided on the top of the rotating wheel 40, and two connection points between the groove 41 and the rotating wheel 40 are provided with… The curved surface 44 has a radius of curvature of 50-80mm to ensure that the roller 36 can smoothly enter and exit the groove 41. The top of the push rod 35 is fixedly connected to the bottom side of one side of the L-shaped plate 34, and the bottom end is rotatably equipped with a roller 36 made of rubber with a surface hardness of Shore A60-A80 to reduce impact and noise when in contact with the rotating wheel 40. The top of the annular sleeve 28 is provided with two clearance grooves 42 to ensure that the rotating wheel 40 does not interfere with the annular sleeve 28 during rotation. The protective cover 43 is fixed on both sides of the annular sleeve 28 and rotatably sleeved on the outer wall of the drive shaft 38. The size of the protective cover 43 is set according to the installation position of the external gear ring 37 and the spur gear 39 to ensure that it can completely cover the meshing area without interfering with the rotation of the components. A gap of 0.5-2mm is reserved between the protective cover 43 and one side of the seat 29 to avoid friction during rotation.

[0075] In another embodiment: Refer to Figure 2 , Figure 4 and Figure 5 The structure of this embodiment is basically the same as that of the previous embodiment, except that: a conical rotating core 4 is rotatably connected inside the flared mouth 3. The cone angle of the conical rotating core 4 is matched with the cone angle of the flared mouth 3, which is 55-85°, to ensure that a uniform airflow channel is formed between the rotating core and the inner wall of the flared mouth 3. The channel gap is 3-5mm to avoid airflow leakage or excessive flow resistance. 3-6 spiral guide grooves 5 are provided on the outer wall of the conical rotating core 4 along the generatrix direction. The lead of the spiral guide grooves 5 is 15-25mm, the groove depth is 3-5mm, and the groove width is 8-12mm. The spiral direction of the guide grooves is consistent to ensure that a stable tangential force is generated when the airflow passes through, driving the conical rotating core 4 to rotate.

[0076] Specifically, the gas mixture is delivered to the bell mouth 3 through the ventilation duct 2 inside the pneumatic gun barrel 1. After entering the bell mouth 3, the mixed gas comes into contact with the spiral guide groove 5 on the outer wall of the conical rotating core 4. When the airflow flows along the spiral guide groove 5, it generates tangential force, which drives the conical rotating core 4 to rotate around its own axis. At the same time, the spiral guide groove 5 changes the airflow direction, so that the mixed gas forms a spiral airflow. Under the action of centrifugal force, it is sprayed out in an umbrella shape against the wall, forming a uniform air curtain covering the inner wall of the furnace body 27. When the gas supply is unexpectedly interrupted, the spiral guide groove 5 extends the fluid path and increases the flow resistance. Combined with the surface tension of the backflow medium molten steel, it delays the time for the backflow medium to flow back into the ventilation duct 2, providing a buffer for emergency treatment.

[0077] A method of using an AOD refining furnace includes the following steps:

[0078] S1. The core function of the segmented re-blowing assembly is to achieve stable gas injection and reliable fixation of itself. Its working process is divided into three stages: fastening connection, temperature response reinforcement, and gas injection.

[0079] S2, Fastening and Connection Stage: Insert the pneumatic gun barrel 1 into the slot 7 of the mounting base 6, rotate the annular nut 24 to move axially along the threaded section 25 of the mounting base 6, the concave surface 26 of the annular nut 24 interacts with the inclined surface 12 of the extrusion rod 11 to generate radial extrusion force to push the moving plate I 10 to slide downward along the extrusion groove 9. The moving plate I 10 drives the moving plate II 15 to move downward synchronously through the cylinder 18, and the moving plate II 15 drives the sliding rod 14 to pass through the fixed plate 13 and extend into the annular groove 8 of the pneumatic gun barrel 1. The ball 17 at the bottom of the sliding rod 14 contacts the inclined surface of the annular groove 8 away from the flare 3. As the moving plate II 15 continues to move downward, the ball 17 rolls along the inclined surface and generates an axial force, pressing the pneumatic gun barrel 1 towards the mounting base 6, thus achieving the initial mechanical fixation of the pneumatic gun barrel 1 and the mounting base 6. During this process, the moving plate II 15 compresses the return spring 16, so that the return spring 16 stores elastic potential energy to provide power for subsequent reset.

[0080] S3. Temperature Response Reinforcement Stage: After the pneumatic gun barrel 1 is inserted into the furnace body 27, the high temperature inside the furnace is conducted through the pneumatic gun barrel 1 to the copper spring plate 23 that is in contact with it. The spring plate 23 transfers the heat to the L-shaped copper rod 22. The L-shaped copper rod 22 slides into contact with the heat-conducting copper plate 20 on one side of the cylinder 18, and then conducts the heat to the thermosensitive paraffin wax inside the cylinder 18 through the heat-conducting copper rod 21. When the temperature reaches the melting point of the thermosensitive paraffin wax (80-120℃), the thermosensitive paraffin wax undergoes volume expansion, with a volume expansion coefficient of 0.05-0.0. At 8℃, the thrust generated by the expansion acts on the top of the piston rod 19, pushing the piston rod 19 to slide downward along the cylinder 18. The piston rod 19 drives the moving plate II 15 to move further downward, increasing the squeezing force of the sliding rod 14 on the annular groove 8, thus achieving adaptive reinforcement under high temperature conditions. When the furnace body 27 stops running and cools down, the temperature-sensitive paraffin contracts, and the return spring 16 releases its elastic potential energy, pushing the moving plate II 15 upward, which in turn drives the sliding rod 14 and the piston rod 19 to reset, reducing the tightening force and facilitating the disassembly and maintenance of the pneumatic gun barrel 1.

[0081] S4. Gas Injection Stage: After oxygen and inert gas are mixed according to the smelting requirements, they are delivered to the bell mouth 3 through the ventilation duct 2 in the pneumatic gun barrel 1. After the mixed gas enters the bell mouth 3, it comes into contact with the spiral guide groove 5 on the outer wall of the conical rotating core 4. When the airflow flows along the spiral guide groove 5, it generates tangential force, which drives the conical rotating core 4 to rotate around its own axis. At the same time, the spiral guide groove 5 changes the airflow direction, so that the mixed gas forms a spiral airflow. Under the action of centrifugal force, it is sprayed out in an umbrella shape against the wall, forming a uniform gas curtain covering the inner wall of the furnace body 27. When the gas supply is unexpectedly interrupted, the spiral guide groove 5 extends the fluid path and increases the flow resistance. Combined with the surface tension of the backflow medium molten steel, it delays the time for the backflow medium to flow back into the ventilation duct 2, providing a buffer for emergency treatment.

[0082] The S5 and AOD refining furnace achieve continuous smelting of stainless steel through the coordinated operation of three segmented reblowing components and the rotation of the furnace body 27. Its working process is divided into three stages: smelting preparation, smelting operation, and molten liquid pouring.

[0083] S6, Smelting Preparation Stage: The mounting bases 6 of the three re-blowing components are fixed to the outer wall of the furnace body 27 with bolts. The three mounting bases 6 are evenly distributed around the circumference of the furnace body 27, and the central angle between adjacent mounting bases 6 is 120°. The axis of the pneumatic gun tube 1 forms an angle of 30-45° with the radial direction of the furnace body 27 to ensure that the gas injection covers the key reaction area of ​​the molten steel in the furnace. The dust hood 32 is stuck at the furnace mouth of the furnace body 27 by its own gravity, and its inner wall is in contact with the outer wall of the furnace mouth to achieve a seal. The gas guide pipe 33 is connected to the bag dust collector through the corrugated pipe to form a flue gas emission channel. The two lifting parts are symmetrically installed on both sides of the top of the annular sleeve 28 to ensure the stability of the lifting process of the dust hood 32.

[0084] S7. Smelting Operation Stage: Start the motor on the base 29. The motor drives the rotating shaft 30 to rotate through the coupling. The rotating shaft 30 drives the annular sleeve 28 and the furnace body 27 to rotate to a vertical state, so that the molten steel in the furnace is evenly mixed. At the same time, the three re-blowing components blow in different proportions of oxygen and inert gas according to the needs of different smelting stages: In the early stage of smelting, the proportion of oxygen is increased to accelerate the decarburization reaction; in the middle and late stages of smelting, the proportion of inert gas argon and nitrogen is increased to promote the homogenization of molten steel composition and temperature regulation. The dust hood 32 is kept sealed under its own gravity. The flue gas in the furnace enters the bag filter for purification treatment through the gas guide pipe 33.

[0085] S8. Molten Steel Pouring Stage: After smelting is completed, the motor drives the rotating shaft 30 to tilt the furnace body 27 to one side. The external gear ring 37 drives the spur gear 39 and the drive shaft 38 to rotate, and the rotating wheel 40 rotates synchronously. When the groove 41 on the rotating wheel 40 is misaligned with the roller 36, the roller 36 enters the outer wall of the rotating wheel 40. The outer wall of the rotating wheel 40 generates an upward thrust on the roller 36. The push rod 35 drives the L-shaped plate 34 to slide upward along the vertical rod 31. The L-shaped plate drives the dust collector 32 to move upward, releasing the seal on the furnace opening. The furnace body 27 continues to tilt to the set angle, pouring the molten steel into the designated container. After pouring is completed, the motor drives the furnace body 27 to reset, the rotating wheel 40 rotates in the opposite direction, and the roller 36 moves along the outer wall of the rotating wheel 40 into the groove 41. The dust collector 32 moves downward under its own gravity and is re-locked in the furnace opening position to achieve a seal.

[0086] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0087] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A segmented re-blowing assembly, characterized in that, include: A pneumatic gun barrel (1) is provided with a ventilation channel (2) inside, and a flared mouth (3) connected to the ventilation channel (2) is provided at one end of the pneumatic gun barrel (1). Mounting base (6) has a slot (7) on one side for inserting and engaging with the pneumatic gun barrel (1), and multiple fastening parts are provided inside the mounting base (6); The outer wall of the mounting base (6) is provided with a threaded section (25), and an annular nut (24) is threadedly connected through the threaded section (25). The outer wall of the pneumatic gun barrel (1) is provided with an annular groove (8) located in the slot (7). The fastening part includes a compression groove (9) and a cylinder (18), which are used to fasten the pneumatic gun barrel (1) to the mounting base (6) through the cooperation of the annular nut (24) and the annular groove (8). Furthermore, the mixture of oxygen and inert gas is ejected in an umbrella shape through the ventilation duct (2) and the flare (3).

2. The segmented re-blowing assembly according to claim 1, characterized in that, The fastening part also includes a sliding rod (14) that cooperates with the annular groove (8). The pressing groove (9) is disposed in the mounting base (6) and communicates with the slot (7). A movable plate I (10) is slidably connected in the pressing groove (9). A pressing rod (11) is fixed at one end of the movable plate I (10) away from the slot (7). One end of the pressing rod (11) extends slidably to the outside of the mounting base (6). A movable plate II (15) located below the movable plate I (10) is slidably connected in the pressing groove (9). A fixed plate (13) located below the moving plate II (15) is fixed inside the extrusion groove (9). A sliding rod (14) fixedly connected to the bottom of the moving plate II (15) is slidably passed through the fixed plate (13). The bottom end of the sliding rod (14) extends into the annular groove (8). The top end of the cylinder (18) is fixedly connected to the bottom of the moving plate I (10). A piston rod (19) is slidably passed through the cylinder (18). The bottom end of the piston rod (19) is fixedly connected to the top of the moving plate II (15). The extrusion rod (11) pushes the moving plate II (15) and the sliding rod (14) downward through the cooperation of the piston rod (19) and the cylinder (18), so that the sliding rod (14) abuts against the inner wall of one side of the annular groove (8), and extrudes the pneumatic gun barrel (1) toward the mounting base (6) to tightly connect the pneumatic gun barrel (1) with the mounting base (6); Furthermore, a reset spring (16) is fixed between the bottom of the movable plate II (15) and the top of the fixed plate (13) via a spring seat, and the reset spring (16) is sleeved on the outer wall of the sliding rod (14) to move the movable plate II (15) upward and reset.

3. A segmented re-blowing assembly according to claim 2, characterized in that, The fastening part also includes an L-shaped copper rod (22) fixed in the mounting base (6). One end of the L-shaped copper rod (22) is fixedly extended into the extrusion groove (9), and the other end of the L-shaped copper rod (22) is fixedly extended into the slot (7) and fixed with a spring plate (23). The spring plate (23) is made of copper and abuts against the outer wall of the pneumatic gun barrel (1) to conduct the furnace temperature on the pneumatic gun barrel (1) to the L-shaped copper rod (22). A heat-conducting copper rod (21) is fixedly inserted through the outer wall of the cylinder (18). A temperature-sensitive paraffin is stored between the top of the piston rod (19) and the top inner wall of the cylinder (18). The heat-conducting copper rod (21) extends into the temperature-sensitive paraffin and is used to conduct the furnace temperature to the temperature-sensitive paraffin and cause the temperature-sensitive paraffin to expand and push the piston rod (19) and the sliding rod (14) downward. A heat-conducting copper sheet (20) is fixed on one side of the cylinder (18), and the heat-conducting copper sheet (20) is fixedly connected to one end of the heat-conducting copper rod (21). The heat-conducting copper sheet (20) slides against one end of the L-shaped copper rod (22) to conduct the temperature on the L-shaped copper rod (22) to the temperature-sensitive paraffin through the heat-conducting copper sheet (20) and the heat-conducting copper rod (21).

4. A segmented re-blowing assembly according to claim 3, characterized in that, The top of the extrusion rod (11) is provided with an inclined surface (12) on the side near the annular nut (24), and the annular nut (24) is provided with an inward concave surface (26) on the side near the extrusion rod (11), and the inclined surface (12) and the inward concave surface (26) cooperate with each other. The ring nut (24) moves along the axis of the mounting base (6) by rotating. The inner concave surface (26) and the inclined surface (12) can push the moving plate I (10), cylinder (18) and moving plate II (15) to move down as a whole. The sliding rod (14) and the annular groove (8) initially fix the pneumatic gun barrel (1) in the mounting base (6).

5. A segmented re-blowing assembly according to claim 4, characterized in that, The bottom end of the sliding rod (14) is fitted with a ball (17) rolling. The inner walls on both sides of the annular groove (8) are inclined, and the ball (17) cooperates with the inclined surface of the annular groove (8) away from the horn mouth (3). During the downward movement of the sliding rod (14) and the ball (17), the ball (17) abuts against the corresponding inclined surface, causing the pneumatic gun barrel (1) to be squeezed toward the mounting base (6), thereby increasing the connection stability through furnace temperature when the pneumatic gun barrel (1) is running. Furthermore, a conical rotating core (4) is rotatably connected inside the horn mouth (3). The outer wall of the conical rotating core (4) is provided with multiple spiral guide grooves (5). When the mixed gas of oxygen and inert gas is injected into the horn mouth (3) through the ventilation channel (2), the mixed gas drives the conical rotating core (4) to rotate under the action of the spiral guide grooves (5), and the mixed gas is spirally sprayed out, forcing the airflow to generate rotational centrifugal force and blow out along the wall, forming an air curtain to protect the refractory bricks.

6. An AOD refining furnace, comprising three segmented reblowing components as described in claim 5, characterized in that, It also includes a furnace body (27) and two bases (29). The outer wall of the furnace body (27) is fixedly fitted with an annular sleeve (28). The two bases (29) are rotatably connected to a rotating shaft (30) on the side that is close to each other. The two rotating shafts (30) are fixedly connected to the annular sleeve (28) on the side that is close to each other, for driving the furnace body (27) to rotate. One end of each of the three pneumatic gun barrels (1) penetrates the inner wall of the furnace body (27) and extends into the furnace body (27). The three mounting bases (6) are fixed to the outer wall of the furnace body (27) by bolts, and are used to blow different proportions of oxygen and inert gas into the furnace body (27) at different stages of smelting. It also includes a dust removal hood (32) installed on the top of the furnace body (27). The inner wall of the dust removal hood (32) is matched with the outer wall of the furnace opening of the furnace body (27). The dust removal hood (32) is stuck at the furnace opening position of the furnace body (27) under its own gravity, sealing the furnace body (27) so that the flue gas inside the furnace body (27) can be discharged without leakage. The top of the dust collector hood (32) is fixedly connected to an air guide pipe (33), and the air guide pipe (33) is connected to the external bag filter through a corrugated pipe. Both of the two seats (29) are provided with lifting parts between them and the furnace body (27). These parts are used to drive the dust hood (32) to move upward and release the furnace body (27) when the furnace body (27) rotates and pours molten liquid. When the furnace body (27) returns to its vertical position, the dust hood (32) is used to seal the furnace opening of the furnace body (27) again.

7. An AOD refining furnace according to claim 6, characterized in that, The lifting unit includes a drive shaft (38) rotatably mounted on one side of the top of the annular sleeve (28) via a base. A spur gear (39) and a rotating wheel (40) are fixed at both ends of the drive shaft (38). An external gear ring (37) is fixed on the side of the base (29) near the furnace body (27), and the external gear ring (37) is coaxial with the rotating shaft (30). The spur gear (39) meshes with the external gear ring (37). A motor is fixed to one side of the base (29) via a frame, and the output shaft of the motor is fixedly connected to the rotating shaft (30) via a coupling. When the furnace body (27) is rotated by the rotating shaft (30), the drive shaft (38) is driven to rotate by the cooperation of the external gear ring (37) and the spur gear (39). A vertical rod (31) is fixed to the top of the furnace body (27). An L-shaped plate (34) is slidably fitted on the outer wall of the vertical rod (31), and one end of the L-shaped plate (34) is fixedly connected to the top of the dust removal hood (32) to drive the dust removal hood (32) to rise and fall. A push rod (35) is fixed to the bottom of one side of the L-shaped plate (34), a groove (41) is provided on the top of the rotating wheel (40), and a roller (36) is rotatably provided at the bottom of the push rod (35), and the roller (36) cooperates with the inner wall of the groove (41) and the outer wall of the rotating wheel (40). When the drive shaft (38) drives the rotating wheel (40) to rotate, the roller (36) drives the push rod (35) and the dust cover (32) to move upward, thereby releasing the dust cover (32) from sealing the furnace opening of the furnace body (27).

8. An AOD refining furnace according to claim 7, characterized in that, The top of the annular sleeve (28) is provided with two clearance grooves (42), and the clearance grooves (42) are used to make way for the rotating wheel (40); Both of the groove (41) and the rotating wheel (40) are provided with arc-shaped surfaces (44) to enable the roller (36) to move smoothly at the connection between the groove (41) and the rotating wheel (40).

9. An AOD refining furnace according to claim 8, characterized in that, Both sides of the annular sleeve (28) are fixed with protective covers (43). The protective covers (43) are rotatably sleeved on the outer wall of the corresponding drive shaft (38), and the protective covers (43) abut against one side of the corresponding seat (29) to protect the external gear ring (37) and the spur gear (39).

10. A method of using an AOD refining furnace, applied to the AOD refining furnace as described in claim 9, characterized in that, Includes the following steps: S1. Insert the pneumatic gun barrel (1) into the slot (7) of the mounting base (6), rotate the ring nut (24) to move axially along the thread section (25), its concave surface (26) interacts with the inclined surface (12) of the extrusion rod (11) to generate a radial force to push the moving plate I (10) down, and drive the moving plate II (15) to move down synchronously, driving the sliding rod (14) to extend into the annular groove (8) of the pneumatic gun barrel (1), the ball (17) rolls along the inclined surface to generate an axial component force, extruding the pneumatic gun barrel (1) and the mounting base (6) to be initially fixed, the moving plate II (15) compresses the return spring (16) to store elastic potential energy, and the mounting base (6) is installed on the outer wall of the furnace body (27) by bolts; S2. After the pneumatic gun barrel (1) is inserted into the furnace body (27), the high temperature inside the furnace is conducted to the temperature-sensitive paraffin inside the cylinder (18) through the spring plate (23), L-shaped copper rod (22), heat-conducting copper plate (20), and heat-conducting copper rod (21). The temperature-sensitive paraffin expands and pushes the piston rod (19) down, which drives the moving plate II (15) to move further down, increasing the squeezing force of the sliding rod (14) on the annular groove (8) to achieve high-temperature adaptive reinforcement. When cooling, the temperature-sensitive paraffin contracts, and the reset spring (16) pushes the component to reset, which is convenient for disassembly and maintenance. S3. After oxygen and inert gas are mixed in the required proportion, they are transported to the bell mouth (3) through the ventilation duct (2) and come into contact with the spiral guide groove (5) of the conical rotating core (4). This generates a tangential force to drive the conical rotating core (4) to rotate, while changing the airflow direction to form a spiral airflow. Under the action of centrifugal force, the airflow is sprayed out in an umbrella shape to cover the inner wall of the furnace body (27). S4. Fix the three re-blowing component mounting bases (6) to the outer wall of the furnace body (27) with bolts. The dust hood (32) is sealed by gravity at the furnace mouth. The air guide pipe (33) is connected to the bag dust collector through the corrugated pipe to form a flue gas emission channel. The two lifting parts are symmetrically installed on both sides of the top of the annular sleeve (28) to ensure that the dust hood (32) rises and falls smoothly. S5. The three re-blowing components blow in different proportions of gas according to the needs of the smelting stage. In the early stage, the proportion of oxygen is increased to accelerate decarburization. In the middle and late stages, the proportion of argon and nitrogen is increased to promote uniform composition and temperature regulation. The dust hood (32) is sealed by gravity. The flue gas enters the bag filter for purification through the gas guide pipe (33). S6. When smelting is completed, the motor drives the rotating shaft (30) to tilt the furnace body (27). The external gear ring (37) drives the spur gear (39), the drive shaft (38) and the rotating wheel (40) to rotate. When the roller (36) is misaligned with the groove (41), the push rod (35) drives the L-shaped plate to move the dust cover (32) upward to release the seal. The furnace body (27) continues to tilt and pour molten steel. After completion, the motor drives the reset, the rotating wheel (40) rotates in the opposite direction, the roller (36) enters the groove (41), and the dust cover (32) moves downward by gravity to reseal.

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