Aod furnace slag adjusting assembly for corrosion-resistant seamless steel pipe and smelting equipment

Abstract

The present application belongs to the technical field of smelting, in particular to an AOD slag adjusting assembly for corrosion-resistant seamless steel pipes and a smelting device, which solves the problems of uneven powder agent feeding, limited diffusion range and low sampling purity. The assembly comprises an AOD furnace body, a Venturi tube, an elbow pipe, a gas injection pipe and the like. A spiral groove is arranged in the elbow pipe to make the powder agent spread in the form of an umbrella, thereby increasing the contact area. The feeding part can adjust the powder agent discharge flow rate. The swinging part drives the elbow pipe to swing, thereby further expanding the contact area. The smelting device comprises the above-mentioned assembly. The sampling pipe is provided with a tapered head and a feeding port, which can physically pierce the slag layer to ensure the sampling purity. After sampling, the steel liquid is discharged by pulling the pull rod. The lifting plate drives the sampling pipe to rotate, thereby throwing off the attached slag.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and in particular to AOD slag conditioning components and smelting equipment for corrosion-resistant seamless steel pipes. Background Technology

[0002] An argon-oxygen decarburization furnace (AOD furnace) is a key piece of equipment in the smelting of corrosion-resistant alloys such as stainless steel. One of its core functions is to decarburize, desulfurize, and remove impurities from molten steel through slag conditioning, thereby ensuring the quality of the finished corrosion-resistant seamless steel pipe. During the production of corrosion-resistant seamless steel pipes, the composition, fluidity, and sufficiency of the slag's reaction with the molten steel directly affect key indicators such as the corrosion resistance and mechanical properties of the steel pipe.

[0003] Existing methods for adjusting AOD slag mostly involve manual or simple mechanical methods of adding slag-forming powder, which have many shortcomings:

[0004] 1. The dosage and speed of slag-forming powder are difficult to control precisely, which can easily lead to problems such as excessive dosage causing the slag to become too thick and lose fluidity, or insufficient dosage failing to achieve effective slag regulation.

[0005] 2. After the powder is added, it mostly enters the furnace in a straight line, resulting in a limited contact area with the slag and low reaction efficiency. An additional stirring mechanism is required to assist in mixing, which not only increases the complexity of the equipment, but may also cause wear due to long-term contact between the stirring mechanism and the high-temperature slag, affecting the service life of the equipment.

[0006] 3. During the AOD furnace smelting process, it is necessary to regularly sample and test the molten steel to monitor whether the composition of the molten steel meets the production requirements. When the existing sampling device is used, because the slag is located on the surface of the molten steel and has a viscous texture, the slag is easily carried into the sampling channel during the downward movement of the sampling tube, resulting in insufficient sample purity and affecting the accuracy of the test results. In addition, after sampling, slag and molten steel are easily attached to the surface of the sampling tube and cone. If not cleaned in time, the solidification will increase the weight of the equipment, affect the flexibility of subsequent sampling operations, and make cleaning difficult. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing slag-forming powders, such as difficulty in accurately controlling the dosing speed, limited diffusion range, and low sampling purity, and to propose an AOD slag conditioning component and smelting equipment for corrosion-resistant seamless steel pipes.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An AOD slag conditioning component for corrosion-resistant seamless steel pipes includes an AOD furnace body, wherein a support frame is fixed on one side of the AOD furnace body.

[0010] A venturi tube is fixedly connected within the support frame, and the inner diameters of both the inlet and outlet sections of the venturi tube are larger than the inner diameter of its throat.

[0011] The bent tube has one end rotatably connected to the outlet end of the Venturi tube, and the other end is bent and extended into the AOD furnace body. The inner wall of the bent tube is provided with a spiral groove so that the mixture of powder and gas flows through the spiral groove to generate a high-speed swirling flow, and the powder is diffused in an umbrella shape by means of centrifugal force.

[0012] The gas injection tube, connected to the inlet end of the venturi tube, is used to inject a mixture of oxygen and inert gas.

[0013] The discharge box is fixed to one side of the AOD furnace body by a storage plate and is used to store slag-forming powder.

[0014] The feeding section includes a conveying pipe connected to the throat of the venturi tube, and the other end of the conveying pipe extends into the discharge box;

[0015] The oscillating part includes a rotating ring fixed to the outer periphery of the bend and a blade rotatably disposed inside the air injection pipe. The oscillating part is used to convert the flow of gas in the air injection pipe into mechanical motion that drives the bend to reciprocate and oscillate.

[0016] In one possible design, the feeding unit further includes:

[0017] A retaining ring is fixed inside the conveying pipe;

[0018] A sealing block is vertically mounted inside the conveying pipe, and its bottom is tapered to fit the fixing ring, for adjusting the effective diameter of the fixing ring;

[0019] An adjustment component, located outside the conveying pipe, is used to drive the sealing block to rise and fall, thereby controlling and opening / closing the flow rate of the slag-forming powder feed.

[0020] In one possible design, the regulating component includes:

[0021] A rotating ring is threadedly fitted onto the outer wall of the conveying pipe;

[0022] The slip ring is connected to the outer wall of the conveying pipe via an axial slide rail structure and is rotatably connected to the rotating ring.

[0023] A magnetic drive assembly is disposed between the slip ring and the sealing block, for transmitting the axial displacement of the slip ring to the sealing block;

[0024] The magnetic drive assembly includes a fixed column fixed to the top of the sealing block, a crossbar fixedly passing through the fixed column, both ends of the crossbar being slidably connected to the inner wall of the conveying pipe, magnets being fixedly embedded at both ends of the crossbar, and an iron ring being fixedly embedded in the inner wall of the slip ring, with magnetic attraction between the iron ring and the magnets.

[0025] In one possible design, the swinging part further includes:

[0026] The movable plate slides through the support frame;

[0027] A movable frame is fixedly attached to the top of the movable plate;

[0028] The turntable is coaxially connected to the shaft of the blade;

[0029] A pin is eccentrically mounted on the turntable and slidably connected to the movable frame to convert the rotational motion of the turntable into the reciprocating linear motion of the movable plate.

[0030] The pin block is fixed to the moving plate and slidably engaged in the arc-shaped groove on the outer circumference of the rotating ring, so as to convert the reciprocating linear motion of the moving plate into the reciprocating deflection and oscillation of the rotating ring and the bent pipe.

[0031] In one possible design, the end of the pin that extends into the arcuate groove is hemispherical.

[0032] In one possible design, a support plate is slidably disposed inside the discharge box, and a pressure sensor is disposed between the support plate and the inner wall of the bottom of the discharge box. The end of the conveying pipe extending into the discharge box slides through the support plate.

[0033] The smelting equipment, including the aforementioned AOD slag conditioning component for corrosion-resistant seamless steel pipes, also includes:

[0034] Two frames are provided, and the two sides of the AOD furnace body are rotatably connected to the two frames via rotating shafts.

[0035] The furnace cover is located on top of the AOD furnace body;

[0036] A sampling tube penetrates the furnace cover and has a cone at its bottom end. An inlet is provided on the tube wall of the sampling tube near the cone.

[0037] The sampling section is located inside the sampling tube and is used to automatically open and close the feed inlet and contain the molten steel sample during the sampling process.

[0038] In one possible design, the sampling unit includes:

[0039] A sliding sleeve is slidably fitted onto the outer wall of the sampling tube to seal the feed inlet;

[0040] An annular plate is fixed to the bottom end of the sliding sleeve and supports the top of the cone head;

[0041] A conical plate is slidably disposed inside the sampling tube and located below the feed inlet;

[0042] A pull rod, the bottom end of which is rotatably connected to the top end of the sliding sleeve, and the top end of which passes through the top of the sampling tube;

[0043] A discharge pipe is located on the side wall of the sampling tube;

[0044] When the cone passes through the slag layer and enters the molten steel, the buoyancy of the molten steel pushes the sliding sleeve and the annular plate upward to open the feed port.

[0045] In one possible design, a lifting drive mechanism is also included, which comprises:

[0046] A U-shaped frame spans across and is fixed to the top of the two frames;

[0047] A vertical rod is fixedly connected between the U-shaped frame and one of the machine frames;

[0048] A screw is arranged parallel to the vertical rod, and its two ends are rotatably connected to the U-shaped frame and another frame, respectively.

[0049] The lifting plate is slidably connected to the vertical rod and threadedly connected to the screw, and the top end of the sampling tube rotates through the lifting plate.

[0050] In one possible design, a rotary drive assembly is also included, the rotary drive assembly comprising:

[0051] Synchronous pulley I is slidably sleeved on the outer wall of the screw through an axial sliding groove structure and rotatably connected to the lifting plate;

[0052] Synchronous pulley II is fixedly connected to the top end of the sampling tube;

[0053] A timing belt connects timing pulley I and timing pulley II;

[0054] When the screw rotates and drives the lifting plate and the sampling tube to rise, the screw drives the synchronous wheel I to rotate, which in turn drives the sampling tube and the cone to rotate through the synchronous belt.

[0055] Beneficial effects: In this invention, by setting a spiral groove inside the bend, the powder gas flow generates high-speed rotation when flowing through the bend, and diffuses in an umbrella shape under the action of centrifugal force; at the same time, the swinging part drives the bend to swing back and forth, further expanding the diffusion range of the powder. The synergistic effect of the two significantly increases the physical contact area between the powder and the slag, and the powder and slag can be fully mixed without the need for an additional stirring mechanism, which effectively improves the reaction efficiency of slag conditioning and shortens the smelting cycle.

[0056] In this invention, the feeding unit, through the cooperation of components such as rotating ring, slip ring, magnet, and sealing block, can precisely adjust the inner diameter of the fixed ring, thereby controlling the discharge flow rate and feeding amount of slag-forming powder. Operators can flexibly adjust the powder feeding amount according to actual smelting needs, improving the accuracy and stability of the smelting process.

[0057] In this invention, the design of the swinging part allows the bent pipe to swing back and forth during the injection of gas and powder, further expanding the physical contact area between the powder and the slag. Compared with static feeding, this dynamic feeding method can make the powder more evenly distributed in the slag, improve the slag conditioning effect, and help to obtain higher quality molten steel.

[0058] In this invention, the sampling section achieves the balance between the gravity of the sliding sleeve and the annular plate and the buoyancy of the molten steel, so that the feed inlet is closed in the slag layer and opened in the molten steel, effectively preventing slag from mixing into the sampling channel and ensuring the purity of the sampled molten steel. After sampling, the sampling tube is rotated by the synchronous transmission mechanism. With the inclined surface design of the annular plate, the slag and molten steel adhering to the sampling tube, cone and annular plate can be automatically cleaned, avoiding residual slag from affecting the purity of subsequent sampling.

[0059] In this invention, the slag-forming powder is diffused in an umbrella shape through the design of the venturi tube and spiral groove, increasing the contact area with the slag and improving the reaction efficiency. The feeding section can adjust the powder discharge flow rate to adapt to different smelting needs. The swing section drives the bent tube to swing, further expanding the contact area. The cone design of the sampling tube can physically pierce the slag layer to ensure the purity of the sample. After sampling, the molten steel can be discharged by pulling the lever, which is simple to operate. The lifting plate drives the sampling tube to rotate, effectively throwing off the attached slag, avoiding solidification and increasing weight, and extending the service life. Attached Figure Description

[0060] Figure 1 This is a three-dimensional cross-sectional view of the AOD furnace body of the AOD slag conditioning component for corrosion-resistant seamless steel pipes provided by the present invention.

[0061] Figure 2 This is a three-dimensional cross-sectional view of the Venturi tube and discharge box of the AOD slag conditioning component for corrosion-resistant seamless steel pipes provided by the present invention.

[0062] Figure 3This is a cross-sectional view of the conveying pipe and fixing ring of the AOD slag conditioning assembly for corrosion-resistant seamless steel pipes provided by the present invention.

[0063] Figure 4 This is a three-dimensional exploded structural diagram of the slip ring, iron ring, and crossbar of the AOD slag conditioning component for corrosion-resistant seamless steel pipes provided by the present invention.

[0064] Figure 5 This is a three-dimensional structural diagram of the gas injection pipe, moving plate, and bend of the AOD slag regulating component for corrosion-resistant seamless steel pipes provided by the present invention.

[0065] Figure 6 This is a three-dimensional exploded structural diagram of the blades, moving plate, and rotating ring of the AOD slag conditioning component for corrosion-resistant seamless steel pipes provided by the present invention.

[0066] Figure 7 This is a three-dimensional cross-sectional view of the bend of the AOD slag conditioning component for corrosion-resistant seamless steel pipes provided by the present invention.

[0067] Figure 8 A three-dimensional structural schematic diagram of the smelting equipment provided by the present invention;

[0068] Figure 9 This is a three-dimensional cross-sectional view of the furnace cover of the smelting equipment provided by the present invention.

[0069] Figure 10 A three-dimensional exploded cross-sectional view of the sampling tube, sliding sleeve, and cone of the smelting equipment provided by the present invention;

[0070] Figure 11 This is a three-dimensional exploded structural diagram of the lifting plate, sampling tube, and screw of the smelting equipment provided by the present invention.

[0071] In the diagram: 1. AOD furnace body; 2. Support frame; 3. Bend; 4. Venturi tube; 5. Gas injection pipe; 6. Shelf; 7. Discharge box; 8. Bearing plate; 9. Pressure sensor; 10. Conveying pipe; 11. Fixed ring; 12. Sealing block; 13. Rotating ring; 14. Slip ring; 15. Iron ring; 16. Fixed column; 17. Crossbar; 18. Magnet; 19. Limiting ring; 20. Blade; 21. Spiral groove; 22. Turntable; 23. Pin; 24. Moving... 25. Moving frame; 26. Moving plate; 27. Pin block; 28. Rotating ring; 29. ​​Arc groove; 30. Frame; 31. U-shaped frame; 32. Furnace cover; 33. Sampling tube; 34. Conical head; 35. Sliding sleeve; 36. Annular plate; 37. Feed inlet; 38. Conical plate; 39. Tie rod; 40. Discharge pipe; 41. Screw; 42. Vertical rod; 43. Lifting plate; 44. Bellows-style protective cover; 45. Synchronous pulley I; 46. Synchronous pulley II; 47. Synchronous belt. Detailed Implementation

[0072] 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.

[0073] In one embodiment: Refer to Figures 1-7 This invention relates to the field of metallurgical technology and relates to an AOD slag conditioning component for corrosion-resistant seamless steel pipes. It mainly includes an AOD furnace body 1 (a small AOD furnace), a support frame 2, a bend 3, a Venturi tube 4, a gas injection pipe 5, a storage plate 6, a discharge box 7, a feeding section, and a swing section. The AOD furnace body 1, as the core container of the entire metallurgical process, is used to hold molten steel and slag. A support frame 2 is fixed to one side of the AOD furnace body 1, serving to support and fix other components. A Venturi tube 4 is fixedly inserted through the support frame 2. The inner diameter of the two ends of the Venturi tube 4 is larger than that of the middle section. This causes the gas flow velocity to increase and the pressure to decrease in the middle section when passing through the Venturi tube 4, which is beneficial for the intake and transport of powder.

[0074] Reference Figure 1 and Figure 2 One end of the Venturi tube 4 is rotatably connected to a bend 3, and one end of the bend 3 extends rotatably into the AOD furnace body 1. The end of the bend 3 inside the AOD furnace body 1 is bent, which changes the injection direction of the gas and powder, allowing them to act more effectively on the slag. A gas injection pipe 5 is fixed to the end of the Venturi tube 4 away from the bend 3. The gas injection pipe 5 is used to inject a mixture of oxygen and inert gas into the Venturi tube 4. During the gas injection process, the gas enters the Venturi tube 4 at a certain flow rate, creating a negative pressure in the middle section of the Venturi tube 4, thereby drawing in and carrying the powder into the AOD furnace body 1.

[0075] Reference Figure 1 and Figure 2 A storage plate 6 is fixed on one side of the AOD furnace body 1, and a discharge box 7 is fixed on the top of the storage plate 6. The discharge box 7 is used to store slag-forming powder. A feeding part is provided between the discharge box 7 and the Venturi tube 4. The feeding part is used to automatically feed the slag-forming powder. The feeding part includes a conveying pipe 10 fixedly connected to the bottom of the Venturi tube 4. The connection position between the conveying pipe 10 and the Venturi tube 4 is located at the middle section of the Venturi tube 4. The other end of the conveying pipe 10 is fixedly penetrated through the bottom inner wall of the discharge box 7 and extends into the discharge box 7.

[0076] Reference Figures 2-4To achieve precise control over the dosage of slag-forming powder, the feeding section is also equipped with an adjustment structure. Specifically, a fixing ring 11 is fixed inside the conveying pipe 10, and a sealing block 12 is provided inside the conveying pipe 10 to adjust the inner diameter of the fixing ring 11. The bottom of the sealing block 12 is conical, and the top and bottom of the fixing ring 11 are provided with grooves. A fixing column 16 is fixed to the top of the sealing block 12, and a crossbar 17 is fixedly inserted through the fixing column 16. Both ends of the crossbar 17 are slidably connected to the inner wall of the conveying pipe 10. The sealing block 12 is raised and lowered by the crossbar 17, thereby adjusting the inner diameter of the fixing ring 11 and controlling the discharge flow rate of the slag-forming powder. Magnets 18 are fixedly embedded at both ends of the crossbar 17. The outer wall of the conveying pipe 10 is provided with external threads, and a rotating ring 13 is fitted on the outer wall of the conveying pipe 10. The conveying pipe 10 is threadedly connected to the rotating ring 13 through the external threads. A sliding ring 14 is rotatably connected to the bottom of the rotating ring 13. The sliding ring 14 is slidably sleeved on the outer wall of the conveying pipe 10 through a sliding groove and a slider. An iron ring 15 is fixedly embedded in the inner wall of the sliding ring 14. A magnetic attraction force is generated between the iron ring 15 and the magnet 18. When the rotating ring 13 rotates, due to the threaded connection between the rotating ring 13 and the outer wall of the conveying pipe 10, the rotating ring 13 will move up and down along the axis of the conveying pipe 10, while driving the sliding ring 14 to rise and fall. The sliding ring 14 drives the sealing block 12 to rise and fall synchronously through the magnetic attraction force between the iron ring 15 and the magnet 18. When the sealing block 12 rises to fit tightly with the fixed ring 11, it can completely block the conveying pipe 10 and stop the slag-forming powder from being added. When the sealing block 12 moves upward, the inner diameter of the fixed ring 11 increases, and the discharge flow rate of the slag-forming powder increases. A limiting ring 19 located below the crossbar 17 is also fixed inside the conveying pipe 10. The limiting ring 19 is used to limit the crossbar 17 and prevent the crossbar 17 from falling excessively.

[0077] Reference Figure 1 and Figure 7 The bend 3 is equipped with a spiral groove 21. When gas and powder are injected into the AOD furnace body 1 through the bend 3, the spiral groove 21 forces the powder flow to rotate at high speed. The physical centrifugal force generated by the rotation causes the powder to diffuse in an umbrella shape after exiting the nozzle, rather than shooting directly to a point. This greatly increases the physical contact area between the powder and the slag, improves the reaction efficiency, and allows diffusion to be achieved without a stirring paddle.

[0078] Reference Figure 5 and Figure 6To further expand the physical contact area between the powder and the slag, the assembly is also equipped with a swinging part. The swinging part includes a rotating ring 27 fixedly sleeved on the outer wall of the bend 3 and a blade 20 rotatably disposed in the gas injection pipe 5 via a rotating shaft. The swinging part also includes a movable plate 25 that slides through the support frame 2. A movable frame 24 is fixed to one side of the top of the movable plate 25. The rotating shaft of the blade 20 extends to one side of the gas injection pipe 5 and is fixed to a turntable 22. A pin 23 is fixed to one side of the turntable 22 at a position off-center, and one end of the pin 23 extends into the movable frame 24 and is slidably connected to the movable frame 24.

[0079] Specifically, when the gas in the injection pipe 5 flows, it will generate an impact force on the blade 20, driving the blade 20 to rotate. The rotation of the blade 20 drives the turntable 22 to rotate, and the pin 23 on the turntable 22 will then make a circular motion. Since the pin 23 extends into the moving frame 24 and is slidably connected to the moving frame 24, the circular motion of the pin 23 will drive the moving frame 24 to move back and forth, thereby driving the moving plate 25 to move back and forth in a straight line.

[0080] Reference Figure 5 and Figure 6 A pin 26 is fixed on the side of the movable plate 25 near the rotating ring 27. The outer wall of the rotating ring 27 is provided with an arc groove 28. The pin 26 slides in the arc groove 28. When the movable plate 25 moves back and forth, the pin 26 slides in the arc groove 28, thereby driving the rotating ring 27 to swing back and forth, and in turn driving the bent pipe 3 to swing back and forth. One end of the pin 26 is a hemisphere, which extends into the arc groove 28. This allows the pin 26 to slide stably in the arc groove 28 and drive the rotating ring 27 to rotate stably, ensuring the smoothness and accuracy of the swing of the bent pipe 3.

[0081] Reference Figure 2 Multiple pressure sensors 9 are fixed to the bottom inner wall of the discharge box 7. The tops of the multiple pressure sensors 9 are equipped with the same support plate 8, which slides within the discharge box 7. The powder is placed on top of the support plate 8, and the conveying pipe 10 extends into the discharge box 7, sliding through the support plate 8. Through the cooperation of the support plate 8 and the pressure sensors 9, the weight of the powder discharged from the discharge box 7 can be detected. When powder is added to the discharge box 7, the support plate 8 is subjected to the gravity of the powder, transmitting pressure to the pressure sensors 9. The pressure sensors 9 convert the pressure signal into an electrical signal and transmit it to the control system. The control system calculates the weight of the powder based on preset parameters. During the powder dispensing process, as the powder is continuously discharged, the weight of the powder on the support plate 8 gradually decreases, and the pressure detected by the pressure sensors 9 changes accordingly. The control system can monitor the remaining amount of powder in real time, facilitating timely replenishment.

[0082] Reference Figure 8 and Figure 9The smelting equipment relates to the field of smelting technology. The AOD slag conditioning assembly for corrosion-resistant seamless steel pipes mentioned above also includes two frames 29, a furnace cover 31 (a small furnace cover that matches the AOD furnace body 1), a sampling tube 32, and a sampling section. The two frames 29 are rotatably connected to the two sides of the AOD furnace body 1 via rotating shafts on their respective sides. This design allows the AOD furnace body 1 to tilt within a certain angle range, which facilitates the pouring and discharge of molten steel. The top of the AOD furnace body 1 is provided with a furnace cover 31, which is used to seal the AOD furnace body 1 to prevent heat loss and the entry of external impurities during the smelting process.

[0083] Reference Figure 9 and Figure 10 A sampling tube 32 is inserted through the furnace cover 31. The sampling tube 32 is equipped with a sampling section for sampling molten steel in the AOD furnace body 1. The sampling section includes a cone 33 fixed at the bottom of the sampling tube 32 and multiple feed ports 36 located on the outer wall of the sampling tube 32 near the cone 33. The design of the cone 33 allows the sampling tube 32 to physically pierce the viscous slag layer during its downward movement. When the sampling tube 32 moves downward as a whole, the cone 33 first contacts the slag layer. As the sampling tube 32 continues to move downward, the cone 33 gradually penetrates the slag layer and enters the depth of the molten steel.

[0084] Reference Figure 9 and Figure 10 During the downward movement of the sampling tube 32, in order to prevent slag from mixing into the sampling tube 32, the sampling part is also equipped with a sealing structure. Specifically, a sliding sleeve 34 is slidably sleeved on the outer wall of the sampling tube 32. The sliding sleeve 34 is used to seal the feed inlet 36. An annular plate 35 is fixed at the bottom end of the sliding sleeve 34 and is placed on the top of the cone head 33. When the sampling tube 32 moves downward through the slag layer, the feed inlet 36 is in a closed state under the gravity of the sliding sleeve 34 and the annular plate 35, which effectively prevents the slag from entering. Once the cone 33 has completely penetrated the slag layer and entered the depths of the molten steel, the enormous buoyancy of the molten steel pushes the sliding sleeve 34 and the annular plate 35 upwards, opening the feed port 36 and allowing pure molten steel to flow into the sampling tube 32. At this time, because the top of the annular plate 35 is inclined, as the sampling tube 32 moves the annular plate 35 upwards, the slag and molten steel adhering to the annular plate 35 will slide down the inclined surface, preventing the slag and molten steel from accumulating on the annular plate 35.

[0085] Reference Figure 10A conical plate 37 is slidably connected inside the sampling tube 32, and the conical plate 37 is located below the feed inlet 36. The top of the sampling tube 32 rotates through the lifting plate 42, and the top of the lifting plate 42 is slidably connected to a pull rod 38. The top of the pull rod 38 passes through the sampling tube 32. A discharge pipe 39 is provided on one side of the sampling tube 32. After sampling is completed, the sampling tube 32 moves upward and resets. The sliding sleeve 34 and the annular plate 35 re-close the feed inlet 36 under the action of gravity. Then, the operator pulls the pull rod 38 upward, and the pull rod 38 drives the conical plate 37 to move upward. The conical plate 37 pushes the molten steel in the sampling tube 32 upward and discharges it through the discharge pipe 39, thus completing the sampling operation.

[0086] Reference Figure 8 and Figure 11 To achieve the lifting and lowering control of the sampling tube 32, the top of the two frames 29 is fixed with the same U-shaped frame 30. The top inner wall of the U-shaped frame 30 is fixed with a vertical rod 41. The bottom end of the vertical rod 41 is fixedly connected to the top of one of the frames 29. The top inner wall of the U-shaped frame 30 is rotatably connected with a screw 40. The bottom end of the screw 40 is rotatably connected to the top of the other frame 29. The outer wall of the vertical rod 41 is slidably fitted with a lifting plate 42, and the lifting plate 42 is threadedly connected to the screw 40. The rotation of the screw 40 can drive the lifting plate 42 to move along the axis of the vertical rod 41, thereby controlling the lifting and lowering of the sampling tube 32. When sampling is required, the screw 40 is rotated to lower the lifting plate 42, causing the sampling tube 32 to move downward. After sampling is completed, the screw 40 is rotated in the opposite direction to raise the lifting plate 42, causing the sampling tube 32 to move upward and reset.

[0087] Reference Figure 8 and Figure 11 In order to protect the screw 40 and prevent external impurities from entering and affecting the normal rotation of the screw 40, the top and bottom of the lifting plate 42 are fixed with bellows-type protective covers 43, and the ends of the two bellows-type protective covers 43 that are far apart from each other are fixedly connected to the top inner wall of the U-shaped frame 30 and the top of the corresponding frame 29, respectively. The bellows-type protective covers 43 are fitted on the outer wall of the screw 40.

[0088] In another embodiment: Refer to Figure 11During the upward movement of the sampling tube 32 driven by the rotation of the screw 40, in order to prevent the slag adhering to the sampling tube 32 and the cone 33 from solidifying and increasing the overall weight of the sampling tube 32 and the cone 33, the smelting equipment is also equipped with a rotary cleaning structure. Specifically, a synchronous wheel I 44 is rotatably connected to the top of the lifting plate 42. The synchronous wheel I 44 is slidably sleeved on the outer wall of the screw 40 through a sliding groove and a slider. A synchronous wheel II 45 is fixed to the top of the sampling tube 32. The synchronous wheel II 45 and the synchronous wheel I 44 are connected by a synchronous belt 46. Since the synchronous wheel I 44 is slidably connected to the screw 40 through the sliding groove and the slider, the slag is slidably connected to the screw 40 during the rotation of the screw 40. During the upward movement of the sampling tube 32, the screw 40 drives the synchronous wheel I 44 to rotate. The synchronous wheel I 44 and the synchronous wheel II 45 are connected by a synchronous belt 46, thereby driving the sampling tube 32 and the cone 33 to rotate. During the rotation, the slag attached to the sampling tube 32 and the cone 33 is thrown off due to centrifugal force, avoiding the adhesion and solidification of slag. The top of the lifting plate 42 is fixed with a protective box for protecting the synchronous wheel I 44, the synchronous wheel II 45 and the synchronous belt 46. The bottom end of the accordion-style protective cover 43 located above the lifting plate 42 is fixedly connected to the top of the protective box, further protecting the normal operation of the rotating cleaning structure.

[0089] The production method of smelting equipment includes the following steps:

[0090] S1. When the raw materials are melted in the AOD furnace body 1, a certain proportion of oxygen and inert gas are injected into the AOD furnace body 1 through the gas injection pipe 5. The gas enters the AOD furnace body 1 through the Venturi tube 4 and the bend pipe 3. When passing through the Venturi tube 4, the flow rate increases due to the smaller inner diameter of the middle section of the Venturi tube 4. A negative pressure is generated in the conveying pipe 10, which draws the slag-forming powder in the discharge box 7 into the Venturi tube 4 and injects it into the AOD furnace body 1 along with the gas. The pressure sensor 9 can detect the quality of the slag-forming powder in the discharge box 7 in real time and detect the amount of slag-forming powder added into the AOD furnace body 1.

[0091] S2. In addition, the threaded connection between the rotating ring 13 and the outer wall of the conveying pipe 10 can drive the slip ring 14 to move up and down. The slip ring 14 drives the sealing block 12 to rise and fall synchronously through the magnetic attraction between the iron ring 15 and the magnet 18. The cooperation between the fixed ring 11 and the sealing block 12 can block the conveying pipe 10 and stop the feeding of slag-forming powder. The rising and falling of the sealing block 12 can also adjust the inner diameter of the fixed ring 11 and control the discharge flow rate of the slag-forming powder.

[0092] S3. The slag-forming powder is injected into the AOD furnace body 1 through the bend pipe 3 along with the gas. Since the bend pipe 3 is equipped with a spiral groove 21, the spiral groove 21 forces the powder gas flow to generate high-speed rotation. The physical centrifugal force generated by the rotation causes the powder to diffuse in an umbrella shape after exiting the nozzle, rather than being directly shot to a point. This increases the physical contact area between the powder and the slag, improves the reaction efficiency, and achieves diffusion without the need for a stirring paddle. In addition, the gas in the gas injection pipe 5 drives the blade 20 to rotate through the impact force when it flows. The blade 20 drives the pin shaft 23 to rotate through the turntable 22. The cooperation between the pin shaft 23 and the moving frame 24 drives the moving plate 25 to move back and forth in a straight line. The moving plate 25 can drive the rotating ring 27 to swing back and forth through the sliding cooperation of the pin block 26 and the arc groove 28, thereby driving the bend pipe 3 to swing, which can further increase the physical contact area between the powder and the slag.

[0093] S4. When it is necessary to take a sample from the AOD furnace body 1 to test the molten steel, the screw 40 is driven by the motor to rotate. The screw 40 is threadedly engaged with the lifting plate 42, which drives the lifting plate 42 to move the sampling tube 32 downward as a whole. The cone 33 at the bottom of the sampling tube 32 can physically pierce the viscous slag layer during the downward movement. At this time, the feed port 36 is closed under the gravity of the sliding sleeve 34 and the annular plate 35 to prevent slag from mixing in. When the cone 33 completely penetrates the slag layer and enters the depth of the molten steel, the huge buoyancy of the molten steel pushes the sliding sleeve 34 and the annular plate 35 upward, and the feed port 36 will be opened, and pure molten steel will flow in to ensure the purity of the sample. After that, the sampling tube 32 moves upward and resets, while the sliding sleeve 34 and the annular plate 35 close the feed port 36 again under the gravity. Then, the staff pulls the pull rod 38 upward, and the cone plate 37 pushes the molten steel upward and discharges it through the discharge pipe 39 to complete the sampling operation.

[0094] S5. Since the synchronous wheel I 44 is slidably connected to the screw 40 through the slide groove and the slider, during the process of the screw 40 rotating to drive the sampling tube 32 to move upward, the screw 40 drives the synchronous wheel I 44 to rotate. The synchronous wheel I 44 and the synchronous wheel II 45 are connected by the synchronous belt 46, which drives the sampling tube 32 and the cone 33 to rotate. This can throw off the slag attached to it, avoid the slag attached to it from solidifying later, and increase the overall weight of the sampling tube 32 and the cone 33. In addition, when the lifting plate 42 drives the sampling tube 32 and the cone 33 to move upward as a whole, the cone 33 abuts against the top inner wall of the furnace cover 31 (AOD furnace body 1 is a small AOD furnace, and furnace cover 31 is a small furnace cover). This can push the furnace cover 31 upward, which is convenient for the AOD furnace body 1 to rotate later to pour out and discharge molten steel.

[0095] However, as is well known to those skilled in the art, the working principle and wiring method of pressure sensor 9 are conventional methods or common knowledge, and will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0096] 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.

[0097] 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. An AOD slag conditioning component for corrosion-resistant seamless steel pipes, comprising an AOD furnace body (1), characterized in that, A support frame (2) is fixed on one side of the AOD furnace body (1); Venturi tube (4) is fixed inside the support frame (2), and the inner diameter of the inlet section and the outlet section of the Venturi tube (4) is larger than the inner diameter of its throat. The bent tube (3) has one end rotatably connected to the outlet end of the Venturi tube (4), and the other end is bent and extended into the AOD furnace body (1). The inner wall of the bent tube (3) is provided with a spiral groove (21) so that the mixture of powder and gas flows through the spiral groove (21) to generate a high-speed swirling flow, and the powder diffuses in an umbrella shape by means of centrifugal force. Gas injection tube (5), connected to the inlet end of the venturi tube (4), is used to inject a mixture of oxygen and inert gas; The discharge box (7) is fixed to one side of the AOD furnace body (1) by means of the storage plate (6) and is used to store slag-forming powder; The feeding section includes a conveying pipe (10) connected to the throat of the venturi tube (4), and the other end of the conveying pipe (10) extends into the discharge box (7); The oscillating part includes a rotating ring (27) fixed to the outer periphery of the bend (3) and a blade (20) rotatably disposed in the gas injection pipe (5). The oscillating part is used to convert the flow of gas in the gas injection pipe (5) into driving the bend (3) to reciprocate and oscillate.

2. The AOD slag conditioning component for corrosion-resistant seamless steel pipes according to claim 1, characterized in that, The feeding section also includes: A fixing ring (11) is fixed inside the conveying pipe (10); A sealing block (12) is vertically mounted inside the conveying pipe (10), and its bottom is tapered to fit the fixing ring (11) for adjusting the effective diameter of the fixing ring (11). An adjustment component is located outside the conveying pipe (10) and is used to drive the sealing block (12) to rise and fall, so as to control and open / close the feeding flow rate of the slag-forming powder.

3. The AOD slag conditioning component for corrosion-resistant seamless steel pipes according to claim 2, characterized in that, The adjustment component includes: A rotating ring (13) is threaded onto the outer wall of the conveying pipe (10); The slip ring (14) is connected to the outer wall of the conveying pipe (10) through an axial slide rail structure and is rotatably connected to the rotating ring (13); A magnetic drive assembly is disposed between the slip ring (14) and the sealing block (12) for transmitting the axial displacement of the slip ring (14) to the sealing block (12). The magnetic drive assembly includes a fixed column (16) fixed on the top of the sealing block (12), a crossbar (17) fixedly passing through the fixed column (16), both ends of the crossbar (17) being slidably connected to the inner wall of the conveying pipe (10), both ends of the crossbar (17) being fixedly embedded with magnets (18), and an iron ring (15) being fixedly embedded in the inner wall of the slip ring (14), and a magnetic attraction force is generated between the iron ring (15) and the magnet (18).

4. The AOD slag conditioning component for corrosion-resistant seamless steel pipes according to claim 3, characterized in that, The swinging part also includes: The movable plate (25) slides through the support frame (2); The movable frame (24) is fixed to the top of the movable plate (25); The turntable (22) is coaxially connected to the shaft of the blade (20); A pin (23) is eccentrically mounted on the turntable (22) and slidably connected to the moving frame (24) to convert the rotational motion of the turntable (22) into the reciprocating linear motion of the moving plate (25); The pin block (26) is fixed to the moving plate (25) and slidably locked in the arc groove (28) on the outer periphery of the rotating ring (27) to convert the reciprocating linear motion of the moving plate (25) into the reciprocating deflection swing of the rotating ring (27) and the bent pipe (3).

5. The AOD slag conditioning component for corrosion-resistant seamless steel pipes according to claim 4, characterized in that, The pin (26) extends into the arc groove (28) at one end in a hemispherical shape.

6. The AOD slag conditioning component for corrosion-resistant seamless steel pipes according to claim 5, characterized in that, The discharge box (7) is slidably provided with a support plate (8), and a pressure sensor (9) is provided between the support plate (8) and the bottom inner wall of the discharge box (7). The conveying pipe (10) extends into the discharge box (7) and slides through the support plate (8).

7. Smelting equipment, including the AOD slag conditioning component for corrosion-resistant seamless steel pipes as described in claim 6, characterized in that, Also includes: Two frames (29), and the two sides of the AOD furnace body (1) are rotatably connected to the two frames (29) respectively through rotating shafts; A furnace cover (31) is located on top of the AOD furnace body (1); A sampling tube (32) penetrates the furnace cover (31) and has a cone (33) at its bottom end. A feed inlet (36) is provided on the tube wall of the sampling tube (32) near the cone (33). The sampling section is located inside the sampling tube (32) and is used to automatically open and close the feed port (36) and contain the molten steel sample during the sampling process.

8. The smelting equipment according to claim 7, characterized in that, The sampling unit includes: A sliding sleeve (34) is slidably sleeved on the outer wall of the sampling tube (32) to close the feed inlet (36). The annular piece (35) is fixed to the bottom end of the sliding sleeve (34) and supported on the top of the cone (33); A conical plate (37) is slidably disposed inside the sampling tube (32) and located below the feed inlet (36); The bottom end of the pull rod (38) is rotatably connected to the top end of the sliding sleeve (34), and the top end passes through the top of the sampling tube (32); The discharge pipe (39) is located on the side wall of the sampling pipe (32); When the cone (33) passes through the slag layer and enters the molten steel, the buoyancy of the molten steel pushes the sliding sleeve (34) and the annular plate (35) to move upward to open the feed port (36).

9. The smelting equipment according to claim 8, characterized in that, It also includes a lifting drive mechanism, which comprises: A U-shaped frame (30) spans across and is fixed to the top of the two frames (29); A vertical rod (41) is vertically fixed between the U-shaped frame (30) and one of the frames (29); The screw (40) is arranged parallel to the vertical rod (41), and its two ends are rotatably connected to the U-shaped frame (30) and another frame (29), respectively; The lifting plate (42) is slidably connected to the vertical rod (41) and threadedly connected to the screw (40). The top end of the sampling tube (32) rotates through the lifting plate (42).

10. The smelting equipment according to claim 9, characterized in that, It also includes a rotation drive assembly, the rotation drive assembly comprising: Synchronous pulley I (44) is slidably sleeved on the outer wall of the screw (40) through an axial groove structure and is rotatably connected to the lifting plate (42); Synchronous pulley II (45) is fixed to the top end of the sampling tube (32); Synchronous belt (46) connects synchronous pulley I (44) and synchronous pulley II (45); When the screw (40) rotates and drives the lifting plate (42) and the sampling tube (32) to rise, the screw (40) drives the synchronous wheel I (44) to rotate, and then drives the sampling tube (32) and the cone (33) to rotate through the synchronous belt (46).

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