Adjustable tuyere for argon-oxygen decarburization furnace and argon-oxygen decarburization furnace

Abstract

The utility model relates to the technical field of decarburization furnaces, in particular to an adjustable tuyere for an argon-oxygen decarburization furnace and the argon-oxygen decarburization furnace. The adjustable tuyere for the argon oxygen decarburization furnace comprises a tuyere body and a mixed gas injection angle adjusting assembly, a cooling gas cavity and a mixed gas cavity which are isolated from each other and coaxially arranged are arranged in the tuyere body, the cooling gas cavity surrounds the outside of the mixed gas cavity, and the mixed gas injection angle adjusting assembly is arranged between the cooling gas cavity and the mixed gas cavity. The mixed gas cavity penetrates through the tuyere body, a mixed gas outlet is formed in one end of the mixed gas cavity, and at least one exhaust hole communicated with the cooling gas cavity is formed in the side face, close to the mixed gas outlet, of the tuyere body. According to the adjustable tuyere for the argon-oxygen decarburization furnace, the spraying angle can be adjusted, it can be guaranteed that mixed gas is more evenly distributed in the furnace, the contact area of the mixed gas and molten steel is relatively large, the decarburization efficiency is improved, and the smelting time is shortened.

Description

Technical Field

[0001] This utility model relates to the field of decarburization furnace technology, specifically to an adjustable tuyer for an argon-oxygen decarburization furnace and an argon-oxygen decarburization furnace. Background Technology

[0002] An AOD (Argon Oxygen Decarburization Furnace) is a refining process used in steelmaking, primarily for producing stainless steel and other special alloy steels. The AOD process offers advantages such as simple equipment, convenient operation, strong adaptability, low investment, and low production costs. It's a refining method that involves blowing oxygen into molten steel while simultaneously introducing inert gases (Ar, N2) under standard atmospheric pressure. This reduces the CO partial pressure, achieving decarburization and preserving chromium. The tuyeres are a key component of the AOD furnace, typically installed on the side wall near the furnace bottom. They are responsible for injecting a mixed gas (such as oxygen, argon, or nitrogen) into the furnace to achieve decarburization and refining processes. Most existing AOD furnace tuyeres have a double-layered structure. The outer layer cools the tuyeres by passing cooling gases (such as argon or nitrogen), reducing their temperature and preventing damage from high temperatures. The inner layer introduces the refining mixed gas into the furnace.

[0003] Existing AOD furnaces can only inject the mixed gas into the furnace through tuyeres in a fixed direction. This single injection direction results in a relatively small contact area between the gas and molten steel, leading to uneven distribution of the mixed gas within the furnace. This, in turn, affects the decarburization reaction, reduces decarburization efficiency, and prolongs smelting time. Furthermore, a single injection direction can cause some areas to receive excessive heat, resulting in localized overheating, while other areas receive insufficient heat, leading to excessively low temperatures and impacting the stability of the smelting process and product quality. Utility Model Content

[0004] (I) The problem this utility model aims to solve is that existing AOD furnaces can only spray the mixed gas into the furnace through a fixed direction when using tuyeres. This single spray direction results in a relatively small contact area between the gas and molten steel, leading to uneven distribution of the mixed gas within the furnace. This, in turn, affects the decarburization reaction, reduces decarburization efficiency, and prolongs smelting time. Furthermore, a single spray direction may cause some areas within the furnace to receive excessive heat, resulting in localized overheating, while other areas receive insufficient heat, leading to excessively low temperatures and affecting the stability of the smelting process and product quality.

[0005] (II) Technical Solution

[0006] An adjustable tuyer for an argon-oxygen decarbonization furnace includes a tuyer body and a mixed gas injection angle adjustment assembly. The tuyer body has a cooling gas chamber and a mixed gas chamber that are isolated from each other and coaxially arranged. The cooling gas chamber surrounds the outside of the mixed gas chamber. The mixed gas chamber passes through the tuyer body and one end of the mixed gas chamber forms a mixed gas outlet. The tuyer body has at least one exhaust hole on the side near the mixed gas outlet that communicates with the cooling gas chamber.

[0007] The mixed gas injection angle adjustment assembly includes a sphere and an angle adjustment component. The sphere has an outlet pipe extending through its center along a first direction. The sphere is movably installed inside the mixed gas chamber and located at the mixed gas outlet. One end of the outlet pipe forms an outlet for injecting gas from the mixed gas chamber into the furnace. The angle adjustment component is connected to the sphere and, when activated, drives the sphere to rotate relative to the mixed gas chamber around a rotation axis, adjusting the angle formed between the axis of the outlet pipe and the axis of the mixed gas chamber. The rotation axis extends along a second direction, which is perpendicular to the first direction.

[0008] According to one embodiment of the present invention, the air outlet body includes an outer tube, an inner tube, and a side gun. The inner tube and the outer tube are coaxially arranged, and the inner tube is placed inside the cavity of the outer tube. A first annular cavity is formed between the outer wall of the inner tube and the inner wall of the outer tube.

[0009] The side gun is annular in shape and has a first side and a second side that are parallel to each other. The same end of the outer tube and the inner tube are respectively connected to the first side of the side gun. The side gun has a second annular cavity and a circular cavity that are coaxially arranged and isolated from each other along its axial direction. The second annular cavity surrounds the outside of the circular cavity and the circular cavity penetrates the side gun. The second annular cavity extends from the first side of the side gun to a position close to its second side.

[0010] The inner tube cavity and the side gun cavity are connected to form the mixed gas cavity, the first annular cavity and the second annular cavity are connected to form the cooling gas cavity, and the side gun is provided with at least one exhaust hole connected to the second annular cavity.

[0011] According to one embodiment of the present invention, the angle adjusting component includes a connecting rod and a lifting drive assembly. One end of the connecting rod is connected to the ball, and the lifting drive assembly is used to drive the connecting rod to swing up and down around the connection between the connecting rod and the ball to drive the ball to rotate.

[0012] According to one embodiment of the present invention, the lifting drive assembly includes a round rod, a rotating cylinder, and a first motor. The bottom end of the round rod is hinged to the end of the connecting rod away from the sphere, and the other end extends into the cavity of the rotating cylinder. A rolling block is provided on the top side of the round rod, and an arc groove is formed on the inner wall of the rotating cylinder. The arc groove has a V-shaped profile. The rolling block is embedded in the arc groove and can move along the length direction of the arc groove. The output end of the first motor is connected to the top of the rotating cylinder and is used to drive the rotating cylinder to rotate around its own axis.

[0013] According to one embodiment of the present invention, a circular hole is provided on the outer wall of the outer tube, and a protective cylinder is sealed and installed at the circular hole. A top plate and a bottom plate are installed in the cavity of the protective cylinder in descending order of height. Both the top plate and the bottom plate are annular, and the inner diameter of the bottom plate is larger than the inner diameter of the top plate. A limiting cavity is formed between the top surface of the bottom plate and the lower surface of the top plate.

[0014] The rotating drum includes a disk and a straight tube connected and coaxially arranged. The top surface of the straight tube is connected to the lower surface of the disk. The disk rests on the top surface of the top plate. The straight tube passes through the top plate and the bottom plate in sequence. The arc groove is provided on the inner wall of the straight tube. The output end of the first motor is connected to the top surface of the disk.

[0015] According to one embodiment of the present invention, at least one limiting rod is installed on the side wall of the round rod. The limiting rod includes a first rod body, a second rod body, and a third rod body connected to each other. The first rod body and the second rod body are perpendicular to each other and parallel to each other. The end of the first rod body away from the second rod body is connected to the side wall of the round rod. The third rod body extends into the limiting cavity between the top plate and the bottom plate.

[0016] According to one embodiment of the present invention, a cooling gas flow rate regulating component is included, the cooling gas flow rate regulating component being used to regulate the cooling gas flow rate through the exhaust hole per unit time;

[0017] The cooling gas flow regulating component includes a toothed ring and a rotary drive component. The toothed ring is circular in shape, and multiple meshing teeth are provided on the outer circumferential surface of the toothed ring. The side of the toothed ring is provided with regulating holes that correspond one-to-one with the exhaust holes. The regulating holes and the exhaust holes are exactly the same.

[0018] The side gun has an annular groove, which is coaxially arranged with the second annular cavity and communicates with the second annular cavity and the exhaust hole. The toothed ring is sleeved in the annular groove. The rotary drive assembly is used to drive the toothed ring to rotate around its axis. When the toothed ring rotates to the first state, the adjustment hole on the toothed ring and the corresponding exhaust hole are aligned.

[0019] According to one embodiment of the present invention, the rotary drive assembly includes a second motor and a gear, the gear being fixed on the output shaft of the second motor, and the gear meshing with the meshing teeth of the gear ring.

[0020] According to one embodiment of the present invention, a bearing is sleeved in the annular groove, and the toothed ring is sleeved on the outer ring of the bearing.

[0021] An argon-oxygen decarburization furnace includes the aforementioned adjustable tuyeres for an argon-oxygen decarburization furnace.

[0022] The beneficial effects of this utility model are:

[0023] When the angle adjustment component operates, it drives the ball to rotate around its axis relative to the gas mixing chamber, thereby adjusting the angle between the axis of the outlet pipe and the axis of the gas mixing chamber, which in turn adjusts the injection angle of the outlet pipe. Since the ball blocks the gas outlet of the gas mixing chamber, the mixed gas in the chamber can only be injected into the furnace through the outlet pipe. Furthermore, because the angle of the outlet pipe is adjustable, the injection angle of the tuyeres can be adjusted.

[0024] Compared to traditional AOD furnace tuyeres, this adjustable tuyer for the argon-oxygen decarburization furnace features an adjustable mixed gas injection angle. During AOD furnace operation, the injection angle is adjusted according to a pre-set program, ensuring a more uniform distribution of the mixed gas within the furnace. This results in a larger contact area between the mixed gas and the molten steel, improving decarburization efficiency and shortening smelting time. Furthermore, the adjustable injection angle prevents the mixed gas from being continuously injected in a fixed direction, avoiding uneven heat distribution in some areas and ensuring the stability of the smelting process and product quality. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 A first-view view of an adjustable duct for an argon-oxygen decarburization furnace provided in an embodiment of this utility model;

[0027] Figure 2 A second-view perspective view of an adjustable duct for an argon-oxygen decarburization furnace provided in an embodiment of this utility model;

[0028] Figure 3 Internal structure diagram of the adjustable duct for the argon-oxygen decarburization furnace provided in this embodiment of the utility model;

[0029] Figure 4 Provided for the embodiments of this utility model Figure 3 Enlarged view of section A;

[0030] Figure 5 A structural diagram of the mixed gas injection angle adjustment component provided in this embodiment of the utility model;

[0031] Figure 6 A structural diagram of the cooling gas flow regulating component provided in this embodiment of the utility model;

[0032] Figure 7 A diagram showing the relationship between the axis of the mixed gas chamber and the axis of the gas outlet when adjusting the angle of the gas outlet of the gas outlet pipe, provided for an embodiment of this utility model.

[0033] Icons: 1. Air vent body; 101. Inner pipe; 102. Outer pipe; 103. Side gun; 104. Mixed gas chamber; 1041. First axis; 105. Cooling gas chamber; 2. Regulating valve; 3. Mixed gas injection angle adjustment assembly; 31. Ball; 32. Air outlet pipe; 321. Second axis; 33. Connecting rod; 34. Strip groove; 4. First motor; 5. Lifting drive assembly; 51. Rotary drum; 52. Arc groove; 53. Round rod; 54. Limiting rod; 55. Pin; 56. Rolling block; 6. Exhaust hole; 7. Cooling gas flow regulation assembly; 71. Gear ring; 72. Adjustment hole; 73. Bearing; 74. Second motor; 75. Gear; 9. Protective cylinder; 901. Top plate; 902. Bottom plate. Detailed Implementation

[0034] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] Example 1:

[0036] like Figures 1-6As shown, Embodiment 1 of this utility model provides an adjustable tuyer for an argon-oxygen decarbonization furnace, including a tuyer body 1 and a mixed gas injection angle adjustment component 3. The tuyer body 1 is provided with a cooling gas chamber 105 and a mixed gas chamber 104 that are isolated from each other and coaxially arranged. The cooling gas chamber 105 surrounds the outside of the mixed gas chamber 104. The mixed gas chamber 104 penetrates the tuyer body 1 and one end of the mixed gas chamber 104 forms a mixed gas outlet. The side of the tuyer body 1 near the mixed gas outlet is provided with at least one exhaust hole 6 that communicates with the cooling gas chamber 105.

[0037] The mixed gas injection angle adjustment assembly 3 includes a sphere 31 and an angle adjustment component. The sphere 31 is provided with an outlet pipe 32 that runs through the center of the sphere along a first direction. The sphere 31 is movably installed in the mixed gas chamber 104 and located at the mixed gas outlet. One end of the outlet pipe 32 forms an outlet for injecting the gas in the mixed gas chamber 104 into the furnace. The angle adjustment component is connected to the sphere 31 and, when activated, drives the sphere 31 to rotate relative to the mixed gas chamber 104 around a rotation axis. This is used to adjust the angle formed between the axis of the outlet pipe 32 and the axis of the mixed gas chamber 104. The rotation axis extends along a second direction, which is perpendicular to the first direction.

[0038] In this embodiment, when the angle adjustment component is activated, it drives the ball 31 to rotate around the rotation axis relative to the gas mixing chamber 104, thereby adjusting the angle formed between the axis of the gas outlet pipe 32 and the axis of the gas mixing chamber 104, which in turn adjusts the injection angle of the gas outlet pipe 32. Since the ball 31 blocks the gas mixing outlet of the gas mixing chamber 104, the mixed gas in the gas mixing chamber 104 can only be injected into the furnace through the gas outlet pipe 32. Furthermore, since the angle of the gas outlet pipe 32 is adjustable, the effect of adjusting the injection angle of the tuyeres can be achieved.

[0039] Compared to traditional AOD furnace tuyeres, this adjustable tuyer for the argon-oxygen decarburization furnace features an adjustable mixed gas injection angle. During AOD furnace operation, the injection angle is adjusted according to a pre-set program, ensuring a more uniform distribution of the mixed gas within the furnace. This results in a larger contact area between the mixed gas and the molten steel, improving decarburization efficiency and shortening smelting time. Furthermore, the adjustable injection angle prevents the mixed gas from being continuously injected in a fixed direction, avoiding uneven heat distribution in some areas and ensuring the stability of the smelting process and product quality.

[0040] The first direction mentioned above is the axial direction of the air outlet pipe 32, and the second direction is the axial direction of the rotation axis of the sphere 31. The second direction is perpendicular to the first direction.

[0041] In this embodiment, as Figure 3and Figure 5 As shown, a circular hole is formed horizontally on the sphere 31, and an outlet pipe 32 is coaxially fixed inside this hole, with the length of the outlet pipe 32 being greater than the diameter of the sphere 31. The sphere 31 is embedded in the gas mixing chamber 104 and located at the gas mixing outlet. The spherical surface of the sphere 31 is in contact with the inner wall of the gas mixing chamber 104, and it can rotate relative to the gas mixing chamber 104. Figure 1 as well as Figure 2 As can be seen, the right end of the exhaust pipe 32 is located inside the mixed gas outlet on the right end face of the tuyer body 1. This ensures that when the angle of the exhaust pipe 32 is adjusted, the mixed gas ejected from the exhaust pipe 32 will not be sprayed onto the inner wall of the mixed gas chamber 104, but will instead be sprayed directly into the furnace. Alternatively, the right end of the exhaust pipe 32 can extend partially from the mixed gas outlet to completely prevent the mixed gas from being sprayed onto the inner wall of the mixed gas chamber 104.

[0042] It should be noted that the sphere 31 can block the gas mixing chamber 104, so that most of the gas mixture in the gas mixing chamber 104 is ejected from the gas outlet pipe 32.

[0043] As an optional embodiment, a rotating shaft is fixedly installed on the inner wall of the gas mixing chamber 104 near the gas mixing outlet. The rotating shaft is horizontally arranged and perpendicular to the axis of the gas mixing chamber 104. A ball 31 is rotatably installed on the rotating shaft, and the spherical surface of the ball 31 is in contact with the inner wall of the gas mixing chamber 104. Static friction is generated between the ball 31 and the gas mixing chamber 104. The function of static friction is to prevent relative movement between the ball 31 and the inner wall of the gas mixing chamber 104.

[0044] In this embodiment, as Figure 3 As shown, the air outlet body 1 includes a double-layered sleeve and a side nozzle 103. The double-layered sleeve includes an outer tube 102 and an inner tube 101, which are coaxially arranged. The inner tube 101 is placed inside the cavity of the outer tube 102, and a first annular cavity is formed between the outer wall of the inner tube 101 and the inner wall of the outer tube 102. The side nozzle 103 is a solid annular shape. A second annular cavity and a circular cavity, which are coaxially arranged and isolated from each other, are provided inside the side nozzle 103 along its axial direction. The second annular cavity surrounds the outside of the circular cavity and penetrates the side nozzle 103. The second annular cavity extends from the left side of the side nozzle 103 to a position near its right side. The diameter of the circular cavity is the same as that of the cavity of the inner tube 101. In this embodiment, the inner tube 101 and the side gun 103 are integrally formed structures. The cavity of the inner tube 101 and the circular cavity of the side gun 103 are connected. The cavity of the inner tube 101 and the circular cavity of the side gun 103 constitute the above-mentioned gas mixing chamber 104.

[0045] It should be noted that the outer circumference of the side lance 103 passes through the refractory brick lining of the AOD furnace and is fixedly connected to the refractory brick. The side lance 103 is usually made of high-temperature and corrosion-resistant metal materials to withstand the high temperature and chemical corrosion environment inside the furnace.

[0046] Furthermore, the end of the outer tube 102 is sealed to the left end face of the side gun 103, and the first annular cavity between the inner tube 101 and the outer tube 102 is connected to the second annular cavity of the side gun 103 to form the aforementioned cooling gas chamber 105. Two exhaust holes 6 connected to the second annular cavity are provided on the right side face of the side gun 103. Thus, after the cooling gas enters the first annular cavity between the inner tube 101 and the outer tube 102, it then enters the second annular cavity of the side gun 103, and finally exits into the furnace through the exhaust holes 6 on the side gun 103.

[0047] For example, the end of the outer tube 102 is welded to the left end face of the side gun 103, or the outer tube 102 and the side gun 103 are connected by threads, that is, the outer side face of the right end of the outer tube 102 is provided with external threads, and the inner wall of the second annular cavity of the side gun 103 is provided with threaded grooves.

[0048] In this embodiment, a first circular hole extending vertically is formed at the top of the outer tube 102, and a second circular hole extending vertically is formed at the top of the inner tube 101. The first and second circular holes are coaxially arranged. A protective cylinder 9 is sealed and installed at the first circular hole at the top of the outer tube 102. The protective cylinder 9 is cylindrical, and its opening is sealed and connected to the first circular hole at the top of the outer tube 102. Further, as... Figure 4 As shown, a top plate 901 and a bottom plate 902 are installed in the cavity of the protective cylinder 9 in descending order. Both the top plate 901 and the bottom plate 902 are annular plates. The top plate 901 is higher than the bottom plate 902, and the inner diameter of the bottom plate 902 is larger than the inner diameter of the top plate 901. A limiting cavity is formed between the top surface of the bottom plate 902 and the lower surface of the top plate 901.

[0049] As a specific embodiment, the angle adjustment component includes a connecting rod 33 and a lifting drive assembly 5. One end of the connecting rod 33 is connected to the end of the air outlet pipe 32 away from the mixed gas outlet. A rectangular groove is formed through the top of the connecting rod 33. Strip grooves 34 are formed on the front and rear inner walls of the rectangular groove. The length direction of the strip grooves 34 is the same as the length direction of the connecting rod 33, and the depth direction of the strip grooves 34 is the same as the width direction of the connecting rod 33.

[0050] The lifting drive assembly 5 includes a round rod 53, a rotating drum 51, and a first motor 4, wherein the rotating drum 51 is as follows: Figure 4 and Figure 5As shown, the rotating drum 51 includes an integrally formed disc and a straight tube, which are coaxially arranged, with the disc being higher than the straight tube. The rotating drum 51 is installed inside the aforementioned protective cylinder 9. Specifically, as shown... Figure 4 As shown, the disc of the rotating cylinder 51 rests on the top surface of the top plate 901, and the straight pipe passes through the top plate 901 and the bottom plate 902 in sequence. Figure 5 As shown, an arc groove 52 is formed on the inner wall of the straight pipe. The outer contour of the arc groove 52 is approximately U-shaped or approximately V-shaped. If the straight pipe is divided into two parts in the middle, as shown... Figure 5 As shown, the arc groove 52 is only opened on the inner wall of a part of the straight pipe. The starting end and the end end of the arc groove 52 are basically the same height, and the middle position of the arc groove 52 is the lowest position of the entire arc groove 52.

[0051] Furthermore, a hemispherical rolling block 56 is provided on the top side of the round rod 53. The top of the round rod 53 extends into the straight tube of the rotating drum 51, and the rolling block 56 of the round rod 53 is embedded in the arc groove 52. The first motor 4 is installed on the inner top wall of the protective cylinder 9, and its output end is fixedly connected to the disc of the rotating drum 51 to drive the rotating drum 51 to rotate around its own axis. A pin 55 is rotatably installed at the bottom end of the round rod 53, and the pin 55 is hinged to the end of the connecting rod 33 away from the ball 31.

[0052] For ease of description, the axis of the gas mixing chamber 104 is named the first axis 1041, and the axis of the gas outlet pipe 32 is named the second axis 321.

[0053] The process of adjusting the air outlet angle of the air outlet pipe 32 can be roughly divided into the following states: In the first state, the rolling block 56 on the round rod 53 is located at the starting end of the arc groove 52. At this time, the round rod 53 pulls the connecting rod 33, and the left end of the connecting rod 33 is higher than its right end, causing the air outlet of the air outlet pipe 32 to deviate downwards. At this time, the included angle between the first axis 1041 and the second axis 321 is as follows: Figure 7 The first state is shown in the diagram.

[0054] Driven by the first motor 4, the rotating drum 51 rotates 90° counterclockwise around its own axis. The rolling block 56 on the round rod 53 slides from the starting end of the arc groove 52 toward the lowest point of the arc groove 52. During this process, the height of the round rod 53 gradually decreases, so that the ball 31 rotates counterclockwise around its own axis of rotation, and the right end of the air outlet of the air outlet pipe 32 gradually rises.

[0055] When the rolling block 56 on the round rod 53 slides to a position between the starting end and the lowest point of the arc groove 52, the right end of the air outlet 32 ​​is in a horizontal state, which is the second state. In the second state, the first axis 1041 and the second axis 321 are collinear. Subsequently, as the first motor 4 drives the rotating drum 51 to continue rotating counterclockwise, the rolling block 56 on the round rod 53 gradually slides to the lowest point of the arc groove 52, and the right end of the air outlet 32 ​​is raised to the first limit state, which is the third state. In the third state, the angular relationship between the first axis 1041 and the second axis 321 is as follows: Figure 7 The third state is shown in the diagram.

[0056] Next, the first motor 4 drives the rotating drum 51 to continue rotating counterclockwise by 90° around its own axis. The rolling block 56 on the round rod 53 slides from the lowest point of the arc groove 52 toward the end of the arc groove 52. Since the end of the arc groove 52 is higher than its lowest point, the height of the round rod 53 gradually increases during this process, so that the ball 31 rotates clockwise around its own axis of rotation, and the right end of the air outlet of the air pipe 32 gradually tilts downward.

[0057] When the rolling block 56 on the round rod 53 slides to a position between the end and the lowest point of the arc groove 52, the right end of the air outlet of the air pipe 32 is horizontal, which is the fourth state. At this time, the first axis 1041 and the second axis 321 are collinear. Subsequently, as the first motor 4 drives the rotating drum 51 to continue rotating counterclockwise, the rolling block 56 on the round rod 53 gradually slides to the end of the arc groove 52, and the right end of the air outlet of the air pipe 32 tilts downwards to the second limit state, which is the fifth state. At this time, the angular relationship between the first axis 1041 and the second axis 321 is as follows: Figure 7 The fifth state is shown in the diagram.

[0058] Finally, the first motor 4 drives the rotating drum 51 to rotate 180° clockwise around its own axis, so that the rotating drum 51 rotates to the initial position. During this process, the angle of the air outlet of the air pipe 32 will also change accordingly.

[0059] In this way, the outlet of the gas pipe 32 can be freely adjusted within a small range of angles. When the AOD furnace is working, the injection angle of the mixed gas can be flexibly adjusted according to the set program, so as to ensure that the distribution of the mixed gas in the furnace is relatively more uniform, the contact area between the mixed gas and the molten steel is relatively large, which improves the decarburization efficiency, shortens the smelting time, and improves the stability of the smelting process and product quality.

[0060] As an optional embodiment, such as Figure 5As shown, a rectangular hole is provided on the connecting rod 33, extending from the top surface of the connecting rod 33 towards its bottom surface. A strip groove 34 is provided on the inner wall of the front and rear sides of the rectangular hole, and the length direction of the strip groove 34 is the same as the length direction of the connecting rod 33. The front and rear ends of the bottom pin 55 of the round rod 53 are respectively inserted into the strip groove 34 on the inner wall of the rectangular hole, and the pin 55 can slide left and right in the strip groove 34.

[0061] In this embodiment, as Figure 4 As shown, at least one limiting rod 54 is installed on the side wall of the round rod 53. The limiting rod 54 includes a first rod body, a second rod body, and a third rod body connected together. The first rod body and the second rod body are perpendicular to each other, and the first rod body and the third rod body are parallel to each other. The end of the first rod body away from the second rod body is connected to the side wall of the round rod 53. The top end of the second rod body is higher than the bottom plate 902 and lower than the top plate 901. The third rod body is located in the limiting cavity between the top plate 901 and the bottom plate 902, and the end face of the third rod body is in sliding contact with the inner wall of the protective cylinder 9.

[0062] The limiting rod 54 can ensure the stability of the round rod 53 during the lifting process and prevent the round rod 53 and the rotating drum 51 from rotating relative to each other.

[0063] This adjustable air outlet also includes a regulating valve 2, which comprises a valve body, a valve stem, and a valve handle. The valve body is coaxially disposed within the cavity of the inner pipe 101, and the circumferential surface of the valve body is sealed to the inner wall of the inner pipe 101. The valve stem of the regulating valve 2 passes through the inner pipe 101 and the outer pipe 102, and the valve handle is mounted on the top of the valve stem.

[0064] It should be noted that the left inlet of regulating valve 2 is connected to the mixed gas supply pipeline via a flange. Thus, by controlling the opening of regulating valve 2, the flow rate of the mixed gas entering the furnace can be adjusted.

[0065] It should be noted that in the past, when the cooling gas entered the cooling gas chamber 105 through the tuyeres of the AOD furnace, it was finally discharged directly into the furnace through the exhaust port 6 on the right side of the tuyeres. Since the number and size of the exhaust ports 6 in the fixed-specification AOD furnace tuyeres are fixed, the flow rate through the tuyeres per unit time cannot be controlled, and thus the cooling effect of the tuyeres cannot be controlled. This affects the temperature distribution and stability inside the furnace, and is not conducive to adjusting the composition and pressure of the atmosphere inside the furnace.

[0066] To address this technical problem, in this embodiment, a cooling gas flow rate regulating component 7 is installed inside the adjustable air vent. This component regulates the flow rate of cooling gas passing through the exhaust port 6 per unit time. Specifically, the cooling gas flow rate regulating component 7 includes a gear ring 71 and a rotary drive assembly, such as... Figure 6As shown, the toothed ring 71 is circular in shape, and multiple meshing teeth are provided on the outer circumference of the toothed ring 71. The side of the toothed ring 71 is provided with adjustment holes 72 that correspond one-to-one with the exhaust holes 6. The adjustment holes 72 and the exhaust holes 6 are exactly the same. That is, when the toothed ring 71 is rotated to a certain fixed position, the adjustment holes 72 on the toothed ring 71 can be perfectly aligned with the exhaust holes 6 on the right side of the side gun 103.

[0067] In this embodiment, the rotary drive assembly includes a second motor 74, a bearing 73, and a gear 75, with the gear 75 fixed to the output shaft of the second motor 74. Figure 3 As shown, the side gun 103 has an annular groove, which is coaxially arranged with the second annular cavity. That is, the second annular cavity, the annular groove, and the exhaust hole 6 are connected in sequence. The bearing 73 is sleeved on the inner wall of the annular groove of the side gun 103, and the gear ring 71 is sleeved on the outer ring of the bearing 73. A cylindrical mounting groove is opened on the side gun 103, and the second motor 74 is sealed and installed in the mounting groove. The mounting groove is connected to the annular groove, and the gear 75 at the output end of the second motor 74 meshes with the meshing teeth on the outer circumferential surface of the gear ring 71.

[0068] Thus, the second motor 74 drives the gear 75 to rotate. Since the gear 75 and the gear ring 71 are meshed, the gear ring 71 can be driven to rotate around its axis, thereby changing the relative position of the adjustment hole 72 on the gear ring 71 and the exhaust hole 6 on the side gun 103, so as to regulate the flow rate of cooling gas through the exhaust hole 6 per unit time.

[0069] It is important to understand that when the adjusting hole 72 on the gear ring 71 and the exhaust hole 6 on the side gun 103 are completely misaligned, the exhaust hole 6 is completely blocked by the gear ring 71, and the flow rate of the mixed gas through the exhaust hole 6 is essentially zero. When the adjusting hole 72 on the gear ring 71 and the exhaust hole 6 on the side gun 103 are completely aligned, the flow rate of cooling gas through the exhaust hole 6 per unit time is at its maximum.

[0070] In this way, the cooling effect of the tuyeres can be effectively controlled, and the flow rate of the cooling gas entering the furnace can be flexibly adjusted. The appropriate flow rate of cooling gas helps to maintain the furnace temperature within a suitable range, which is conducive to the smooth progress of the smelting process.

[0071] Furthermore, the flow rate of cooling gas affects the composition and pressure of the furnace atmosphere, which in turn affects the chemical reaction and composition control of the molten steel. In this embodiment, the flow rate of cooling gas can be adjusted to a suitable range, thereby facilitating the regulation of the composition and pressure of the furnace atmosphere.

[0072] In this embodiment, both the first motor 4 and the second motor 74 are DC motors. The first motor 4 and the second motor 74 are respectively connected to the controller for communication. The controller is used to control the opening, closing, direction and speed of the first motor 4 and the second motor 74.

[0073] It should be noted that using a controller to control the starting, stopping, direction, and speed of a motor is a mature existing technology. Controllers typically use pulse width modulation (PWM) technology to adjust the motor speed. The duty cycle of the PWM signal determines the average current in the motor windings, thus changing the motor speed. A larger duty cycle results in a higher motor speed. The controller uses an H-bridge circuit to change the motor's direction of rotation. The H-bridge circuit consists of four switches; changing the state of the switches changes the direction of the current, thus achieving forward and reverse rotation of the motor. The controller controls the activation and deactivation of relays to start and stop the motor. Therefore, in this embodiment, the principle of how the controller controls the first motor 4 and the second motor 74 will not be elaborated further.

[0074] Example 2:

[0075] Embodiment 2 of this utility model provides an argon-oxygen decarburization furnace, which is equipped with the adjustable air vent for the argon-oxygen decarburization furnace described in Embodiment 1 above.

[0076] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0077] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0078] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An adjustable tuyer for an argon-oxygen decarburization furnace, characterized in that, The device includes an air vent body (1) and a mixed gas injection angle adjustment assembly (3). The air vent body (1) is provided with a cooling gas chamber (105) and a mixed gas chamber (104) that are isolated from each other and coaxially arranged. The cooling gas chamber (105) surrounds the outside of the mixed gas chamber (104). The mixed gas chamber (104) penetrates the air vent body (1) and one end of the mixed gas chamber (104) forms a mixed gas outlet. The air vent body (1) is provided with at least one exhaust hole (6) on the side near the mixed gas outlet that is connected to the cooling gas chamber (105). The mixed gas injection angle adjustment assembly (3) includes a sphere (31) and an angle adjustment component. The sphere (31) is provided with an outlet pipe (32) that runs through the center of the sphere along a first direction. The sphere (31) is movably installed in the mixed gas chamber (104) and located at the mixed gas outlet. One end of the outlet pipe (32) forms an outlet for injecting gas from the mixed gas chamber (104) into the furnace. The angle adjustment component is connected to the sphere (31) and, when activated, drives the sphere (31) to rotate relative to the mixed gas chamber (104) around a rotation axis to adjust the angle formed between the axis of the outlet pipe (32) and the axis of the mixed gas chamber (104). The rotation axis extends along a second direction, which is perpendicular to the first direction.

2. The adjustable tuyeres for an argon-oxygen decarburization furnace according to claim 1, characterized in that, The air outlet body (1) includes an outer tube (102), an inner tube (101), and a side gun (103). The inner tube (101) and the outer tube (102) are coaxially arranged, and the inner tube (101) is placed inside the cavity of the outer tube (102). A first annular cavity is formed between the outer wall of the inner tube (101) and the inner wall of the outer tube (102). The side gun (103) is annular and has a first side and a second side that are parallel to each other. The same end of the outer tube (102) and the inner tube (101) are respectively connected to the first side of the side gun (103). The side gun (103) has a second annular cavity and a circular cavity that are coaxially arranged and isolated from each other along its axial direction. The second annular cavity surrounds the outside of the circular cavity and the circular cavity penetrates the side gun (103). The second annular cavity extends from the first side of the side gun (103) to a position close to its second side. The inner tube (101) and the side gun (103) are connected to form the mixed gas chamber (104), the first annular cavity and the second annular cavity are connected to form the cooling gas chamber (105), and the side gun (103) is provided with at least one exhaust hole (6) connected to the second annular cavity.

3. An adjustable tuyer for an argon-oxygen decarburization furnace according to claim 2, characterized in that, The angle adjustment component includes a connecting rod (33) and a lifting drive assembly (5). One end of the connecting rod (33) is connected to the ball (31). The lifting drive assembly (5) is used to drive the connecting rod (33) to swing up and down around the connection between the connecting rod (33) and the ball (31) to drive the ball (31) to rotate.

4. An adjustable tuyer for an argon-oxygen decarburization furnace according to claim 3, characterized in that, The lifting drive assembly (5) includes a round rod (53), a rotating drum (51), and a first motor (4). The bottom end of the round rod (53) is hinged to the end of the connecting rod (33) away from the ball (31), and the other end extends into the cavity of the rotating drum (51). A rolling block (56) is provided on the top side of the round rod (53). An arc groove (52) is provided on the inner wall of the rotating drum (51). The arc groove (52) has a V-shaped profile. The rolling block (56) is embedded in the arc groove (52) and can move along the length direction of the arc groove (52). The output end of the first motor (4) is connected to the top of the rotating drum (51) and is used to drive the rotating drum (51) to rotate around its own axis.

5. An adjustable tuyer for an argon-oxygen decarburization furnace according to claim 4, characterized in that, A circular hole is provided on the outer wall of the outer tube (102), and a protective cylinder (9) is sealed and installed at the circular hole. A top plate (901) and a bottom plate (902) are installed in the cylinder cavity of the protective cylinder (9) in descending order. Both the top plate (901) and the bottom plate (902) are annular, and the inner diameter of the bottom plate (902) is larger than the inner diameter of the top plate (901). A limiting cavity is formed between the top surface of the bottom plate (902) and the lower surface of the top plate (901). The rotating drum (51) includes a disk and a straight tube connected and coaxially arranged. The top surface of the straight tube is connected to the lower surface of the disk. The disk rests on the top surface of the top plate (901). The straight tube passes through the top plate (901) and the bottom plate (902) in sequence. The arc groove (52) is provided on the inner wall of the straight tube. The output end of the first motor (4) is connected to the top surface of the disk.

6. An adjustable tuyer for an argon-oxygen decarburization furnace according to claim 5, characterized in that, At least one limiting rod (54) is installed on the side wall of the round rod (53). The limiting rod (54) includes a first rod body, a second rod body and a third rod body connected together. The first rod body and the second rod body are perpendicular to each other and the first rod body and the third rod body are parallel to each other. The end of the first rod body away from the second rod body is connected to the side wall of the round rod (53). The third rod body extends into the limiting cavity between the top plate (901) and the bottom plate (902).

7. An adjustable tuyer for an argon-oxygen decarburization furnace according to claim 2, characterized in that, It includes a cooling gas flow rate regulating component (7), which is used to regulate the flow rate of cooling gas passing through the exhaust port (6) per unit time; The cooling gas flow regulating component (7) includes a toothed ring (71) and a rotary drive component. The toothed ring (71) is circular in shape. Multiple meshing teeth are provided on the outer circumferential surface of the toothed ring (71). The side of the toothed ring (71) is provided with regulating holes (72) that correspond one-to-one with the exhaust holes (6). The regulating holes (72) and the exhaust holes (6) are exactly the same. The side gun (103) is provided with an annular groove, which is coaxially arranged with the second annular cavity and connected to the second annular cavity and the exhaust hole (6). The toothed ring (71) is sleeved in the annular groove. The rotary drive assembly is used to drive the toothed ring (71) to rotate around its axis. When the toothed ring (71) rotates to the first state, the adjustment hole (72) on the toothed ring (71) and the corresponding exhaust hole (6) are aligned.

8. An adjustable tuyer for an argon-oxygen decarburization furnace according to claim 7, characterized in that, The rotary drive assembly includes a second motor (74) and a gear (75), the gear (75) being fixed on the output shaft of the second motor (74), and the gear (75) meshing with the meshing teeth of the gear ring (71).

9. An adjustable tuyer for an argon-oxygen decarburization furnace according to claim 8, characterized in that, A bearing (73) is fitted inside the annular groove, and a toothed ring (71) is fitted on the outer ring of the bearing (73).

10. An argon-oxygen decarburization furnace, characterized in that, The adjustable tuyeres for an argon-oxygen decarburization furnace include any one of claims 1-9.

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