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

Abstract

The invention 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 formed 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] The invention relates to the technical field of decarburization furnaces, and in particular to an adjustable tuyere for an argon-oxygen decarburization furnace and the argon-oxygen decarburization furnace. Background Art

[0002] AOD (Argon Oxygen Decarburization Furnace), full name argon oxygen decarburization furnace, is used for steel smelting equipment, mainly used for the production of stainless steel and other special alloy steels. AOD furnace method has the advantages of simple equipment, convenient operation, strong adaptability, low investment and low production cost. It is a refining method that blows oxygen into molten steel while blowing inert gas (Ar, N2) under standard atmospheric pressure, and achieves the purpose of decarburization and chromium preservation by reducing the CO partial pressure. The tuyere of AOD furnace is one of its key components. It is installed on the side wall of the furnace body close to the bottom of the furnace, and is responsible for spraying mixed gas (such as oxygen, argon or nitrogen) into the furnace to achieve decarburization, refining and other smelting processes. Most of the existing AOD furnace tuyere is a double-layer casing structure. The outer casing is used to pass cooling gas (such as argon or nitrogen) to reduce the temperature of the tuyere to prevent it from being damaged by high temperature, while the inner casing is used to pass the mixed gas for refining into the furnace.

[0003] When the existing AOD furnace uses tuyere to spray the mixed gas in the furnace, it can only spray in a fixed direction. Since the single spray direction will result in a relatively small contact area between the gas and the molten steel, the mixed gas is unevenly distributed in the furnace, which in turn affects the decarburization reaction, reduces the decarburization efficiency, and prolongs the smelting time. In addition, the single spray direction may also cause some areas in the furnace to receive too much heat input, causing local overheating. In some areas, the heat input is too little and the temperature is too low, affecting the stability of the smelting process and product quality. Summary of the invention

[0004] (I) The problem to be solved by the present invention is that when the existing AOD furnace uses tuyere to spray the mixed gas in the furnace, it can only spray in a fixed direction. Since the single spray direction will cause the contact area between the gas and the molten steel to be relatively small, the distribution of the mixed gas in the furnace will be uneven, which will affect the decarburization reaction, reduce the decarburization efficiency, and prolong the smelting time. In addition, the single spray direction may also cause certain areas in the furnace to receive excessive heat input, causing local overheating. In some areas, the heat input is too little and the temperature is too low, affecting the stability of the smelting process and the quality of the product.

[0005] (II) Technical solution

[0006] An adjustable tuyere for an argon-oxygen decarburization furnace comprises a tuyere body and a mixed gas injection angle adjustment assembly, wherein 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, the mixed gas cavity passes through the tuyere body and one end of the mixed gas cavity forms a mixed gas outlet, and at least one exhaust hole which is in communication with the cooling gas cavity is arranged on the side of the tuyere body close to the mixed gas outlet;

[0007] The mixed gas injection angle adjustment assembly includes a sphere and an angle adjustment member. The sphere is provided with an outlet pipe penetrating the center of the sphere along a first direction. The sphere is movably installed in the mixed gas chamber and is located at the mixed gas outlet. One end of the outlet pipe forms an outlet for injecting the gas in the mixed gas chamber into the furnace. The angle adjustment member is connected to the sphere and is used to drive the sphere to rotate around a rotation axis relative to the mixed gas chamber when in operation, so as to adjust 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, and the second direction is perpendicular to the first direction.

[0008] According to one embodiment of the present invention, the tuyere body comprises 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 in the tube cavity of the outer tube, and 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, having a first side surface and a second side surface which are parallel to each other. The same end of the outer tube and the inner tube is respectively connected to the first side surface of the side gun. The side gun is provided with a second annular cavity and a circular cavity which are coaxially arranged and isolated from each other along its axial direction. The second annular cavity surrounds the outside of the circular cavity. The circular cavity passes through the side gun. The second annular cavity extends from the first side surface of the side gun to a position close to the second side surface thereof.

[0010] The tube cavity of the inner tube and the circular cavity of the side gun 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 adjustment member includes a connecting rod and a lifting drive assembly, one end of the connecting rod is connected to the sphere, 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 sphere to drive the sphere to rotate.

[0012] According to one embodiment of the present invention, the lifting drive assembly includes a round rod, a rotating drum and a first motor, the bottom end of the round rod is hinged to one end of the connecting rod away from the sphere, and the other end thereof extends into the cylinder cavity of the rotating drum, a rolling block is provided on the top side surface of the round rod, an arc groove is provided on the inner wall of the rotating drum, the contour of the arc groove is V-shaped, 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 drum, and is used to drive the rotating drum to rotate around its own axis.

[0013] According to one embodiment of the present invention, a circular hole is opened on the outer wall of the outer tube, a protective tube is sealed and installed at the circular hole, a top plate and a bottom plate are installed in the tube cavity of the protective tube in descending order, the top plate and the bottom plate are both annular, and the inner diameter of the bottom plate is larger than the inner diameter of the top plate, and a limited position 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 disc and a straight tube that are connected and coaxially arranged. The top surface of the straight tube is connected to the lower surface of the disc. The disc 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 arranged on the inner wall of the straight tube. The output end of the first motor is connected to the top surface of the disc.

[0015] According to one embodiment of the present invention, at least one limiting rod is installed on the side wall of the round rod, and the limiting rod includes a first rod body, a second rod body and a third rod body that are connected to each other, the first rod body and the second rod body are perpendicular to each other, the first rod body and the third rod body are parallel to each other, one end of the first rod body away from the second rod body is connected to the side wall of the round rod, and 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 regulating component is included, wherein the cooling gas flow regulating component is used to regulate the cooling gas flow passing through the exhaust hole per unit time;

[0017] The cooling gas flow regulating assembly comprises a gear ring and a rotation driving assembly, wherein the gear ring is in a circular ring shape, a plurality of meshing teeth are arranged on the outer peripheral surface of the gear ring, and a regulating hole corresponding to the exhaust hole is arranged on the side surface of the gear ring, and the regulating hole and the exhaust hole are exactly the same;

[0018] An annular groove is provided in the side gun, and the annular groove is coaxially arranged with the second annular cavity and is connected with the second annular cavity and the exhaust hole. The gear ring is sleeved in the annular groove; the rotary drive assembly is used to drive the gear to rotate around its axis, and when the gear ring rotates to the first state, the adjustment hole on the gear ring is aligned with the corresponding exhaust hole.

[0019] According to one embodiment of the present invention, the rotary drive assembly includes a second motor and a gear, wherein the gear is fixed to an output shaft of the second motor and meshes with 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 gear ring is sleeved on the outer ring of the bearing.

[0021] An argon oxygen decarburization furnace comprises the above-mentioned adjustable tuyere for the argon oxygen decarburization furnace.

[0022] Beneficial effects of the present invention:

[0023] When the angle adjustment member is in operation, the sphere can be driven to rotate around the rotation axis relative to the mixed gas chamber, so that the angle formed between the axis of the gas outlet pipe and the axis of the mixed gas chamber can be adjusted, that is, the injection angle of the gas outlet pipe can be adjusted. Since the sphere blocks the mixed gas outlet of the mixed gas chamber, the mixed gas in the mixed gas chamber can only be injected into the furnace from the gas outlet pipe, and since the angle of the gas outlet pipe is adjustable, the injection angle of the air outlet can be adjusted.

[0024] Compared with the previous AOD furnace tuyere, the adjustable tuyere for the argon oxygen decarburization furnace has an adjustable injection angle of the mixed gas. Therefore, when the AOD furnace is working, the injection angle of the mixed gas is adjusted according to the set program, so that the mixed gas can be distributed more evenly in the furnace, and the contact area between the mixed gas and the molten steel is relatively large, which improves the decarburization efficiency and shortens the smelting time. Moreover, since the injection angle of the mixed gas is adjustable, the mixed gas will not be continuously injected in a fixed direction, which avoids excessive heat input in some areas of the furnace, while too little heat input in some areas, resulting in uneven heat distribution in the furnace, affecting the stability of the smelting process and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A first perspective view of an adjustable tuyere for an argon-oxygen decarburization furnace provided in an embodiment of the present invention;

[0027] Figure 2 A second viewing angle diagram of the adjustable tuyere for the argon-oxygen decarburization furnace provided in an embodiment of the present invention;

[0028] Figure 3An internal structural diagram of an adjustable tuyere for an argon oxygen decarburization furnace provided in an embodiment of the present invention;

[0029] Figure 4 The embodiment of the present invention provides Figure 3 A magnified view of part A;

[0030] Figure 5 A structural diagram of a mixed gas injection angle adjustment assembly provided in an embodiment of the present invention;

[0031] Figure 6 A structural diagram of a cooling gas flow regulating assembly provided in an embodiment of the present invention;

[0032] Figure 7 A diagram showing the relationship between the axis of the mixed gas chamber and the axis of the air outlet pipe when adjusting the air outlet angle of the air outlet pipe provided in an embodiment of the present invention.

[0033] Icons: 1. Air outlet body; 101. Inner tube; 102. Outer tube; 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. Sphere; 32. Exhaust pipe; 321. Second axis; 33. Connecting rod; 34. Strip groove; 4. First motor; 5. Lifting drive assembly; 51. Rotating drum; 52. Arc groove; 53. Round rod; 54. Limiting rod; 55. Pin shaft; 56. Rolling block; 6. Exhaust hole; 7. Cooling gas flow adjustment assembly; 71. Gear ring; 72. Adjusting hole; 73. Bearing; 74. Second motor; 75. Gear; 9. Protective tube; 901. Top plate; 902. Bottom plate. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Embodiment 1:

[0036] like Figure 1-Figure 6 As shown, the first embodiment of the present invention provides an adjustable tuyere for an argon oxygen decarburization furnace, comprising a tuyere body 1 and a mixed gas injection angle adjustment assembly 3, wherein a cooling gas chamber 105 and a mixed gas chamber 104 which are isolated from each other and coaxially arranged are provided in the tuyere body 1, the cooling gas chamber 105 surrounds the outside of the mixed gas chamber 104, the mixed gas chamber 104 passes through the tuyere body 1 and one end of the mixed gas chamber 104 forms a mixed gas outlet, and at least one exhaust hole 6 which is connected to the cooling gas chamber 105 is provided on the side of the tuyere body 1 close to the mixed gas outlet;

[0037] The mixed gas injection angle adjustment assembly 3 includes a sphere 31 and an angle adjustment member. The sphere 31 is provided with an outlet pipe 32 that passes through the center of the sphere along a first direction. The sphere 31 is movably installed in the mixed gas chamber 104 and is 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 member is connected to the sphere 31 and is used to drive the sphere 31 to rotate around the rotation axis relative to the mixed gas chamber 104 when in operation, so as 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, and the second direction is perpendicular to the first direction.

[0038] In this embodiment, when the angle adjustment member is in operation, the sphere 31 can be driven to rotate about the rotation axis relative to the mixed gas chamber 104, so that the angle formed between the axis of the gas outlet pipe 32 and the axis of the mixed gas chamber 104 can be adjusted, that is, the injection angle of the gas outlet pipe 32 can be adjusted. Since the sphere 31 blocks the mixed gas outlet of the mixed gas chamber 104, the mixed gas in the mixed gas chamber 104 can only be injected into the furnace from the gas outlet pipe 32, and since the angle of the gas outlet pipe 32 is adjustable, the effect of adjusting the injection angle of the air outlet can be achieved.

[0039] Compared with the previous AOD furnace tuyere, the adjustable tuyere for the argon oxygen decarburization furnace has an adjustable injection angle of the mixed gas. Therefore, when the AOD furnace is working, the injection angle of the mixed gas is adjusted according to the set program, so that the mixed gas can be distributed more evenly in the furnace, and the contact area between the mixed gas and the molten steel is relatively large, which improves the decarburization efficiency and shortens the smelting time. Moreover, since the injection angle of the mixed gas is adjustable, the mixed gas will not be continuously injected in a fixed direction, which avoids excessive heat input in some areas of the furnace, while too little heat input in some areas, resulting in uneven heat distribution in the furnace, affecting the stability of the smelting process and product quality.

[0040] The first direction 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, if Figure 3 and Figure 5 As shown, a circular hole is opened in the horizontal direction on the sphere 31, and the outlet pipe 32 is coaxially fixed in the circular hole, and the length of the outlet pipe 32 is greater than the diameter of the sphere 31. The sphere 31 is embedded in the mixed gas chamber 104 and is located at the mixed gas outlet. The spherical surface of the sphere 31 is in contact with the inner wall of the mixed gas chamber 104 and can rotate relative to the mixed gas chamber 104. Figure 1 as well as Figure 2It can be seen that the right end of the gas outlet pipe 32 is located in the mixed gas outlet on the right end surface of the tuyere body 1, so that when the angle of the gas outlet pipe 32 is adjusted, the mixed gas ejected from the gas outlet pipe 32 will not be ejected onto the inner wall of the mixed gas chamber 104, but will be directly ejected into the furnace. Of course, the right end of the gas outlet pipe 32 can also extend a portion from the mixed gas outlet to completely prevent the mixed gas from being ejected onto the inner wall of the mixed gas chamber 104.

[0042] It should be noted that the sphere 31 can block the mixed gas chamber 104 , so that most of the mixed gas in the mixed gas 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 mixed gas chamber 104 near the mixed gas outlet side. The rotating shaft is horizontally arranged and perpendicular to the axis of the mixed gas chamber 104. The sphere 31 is rotatably installed on the rotating shaft, and the spherical surface of the sphere 31 contacts the inner wall of the mixed gas chamber 104. Static friction is generated between the sphere 31 and the mixed gas chamber 104. The function of the static friction is to prevent the relative movement between the sphere 31 and the inner wall of the mixed gas chamber 104.

[0044] In this embodiment, if Figure 3 As shown, the tuyere body 1 includes a double-layer casing and a side gun 103, wherein the double-layer casing includes an outer tube 102 and an inner tube 101, the inner tube 101 and the outer tube 102 are coaxially arranged, and the inner tube 101 is placed in the tube 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 gun 103 is a solid annular shape, and a second annular cavity and a circular cavity are coaxially arranged and isolated from each other along the axial direction of the side gun 103, the second annular cavity surrounds the outside of the circular cavity, and the circular cavity passes through the side gun 103, and the second annular cavity extends from the left side of the side gun 103 to a position close to the right side thereof. The diameter of the circular cavity is the same as that of the tube cavity of the inner tube 101. In this embodiment, the inner tube 101 and the side gun 103 are an integrally formed structure, the lumen of the inner tube 101 and the circular lumen of the side gun 103 are connected, and the lumen of the inner tube 101 and the circular lumen of the side gun 103 constitute the above-mentioned mixed gas chamber 104.

[0045] It should be noted that the outer peripheral surface of the side gun 103 passes through the lining refractory bricks of the AOD furnace and is fixedly connected to the refractory bricks. The material of the side gun 103 is usually a high temperature resistant and corrosion resistant metal material to withstand the high temperature and chemical corrosion environment in the furnace.

[0046] Furthermore, the end of the outer tube 102 is sealed and connected 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 above-mentioned cooling gas cavity 105. Two exhaust holes 6 connected to the second annular cavity are provided on the right side face of the side gun 103. In this way, 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 is discharged into the furnace from the exhaust holes 6 on the side gun 103.

[0047] Exemplarily, 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 threadedly connected, that is, an external thread is provided on the outer side face of the right end of the outer tube 102, and a thread groove is provided on the inner wall of the second annular cavity of the side gun 103.

[0048] In this embodiment, a first circular hole extending in the vertical direction is opened at the top of the outer tube 102, and a second circular hole extending in the vertical direction is opened at the top of the inner tube 101. The first circular hole and the second circular hole are coaxially arranged. A protective tube 9 is sealed and installed at the first circular hole at the top of the outer tube 102. The protective tube 9 is cylindrical, and the tube mouth of the protective tube 9 is sealed and connected with 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 cylinder 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 limited 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 member includes a connecting rod 33 and a lifting drive assembly 5, wherein one end of the connecting rod 33 is connected to the end of the outlet pipe 32 away from the mixed gas outlet, a rectangular groove penetrating the connecting rod 33 is opened on the top of the connecting rod 33, and strip grooves 34 are respectively opened on the front and rear inner walls of the rectangular groove, the length direction of the strip groove 34 is the same as the length direction of the connecting rod 33, and the depth direction of the strip groove 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 shown in FIG. Figure 4 and Figure 5 As shown, the rotating drum 51 includes an integrally formed disc and a straight tube, the disc and the straight tube are coaxially arranged, and the disc is higher than the straight tube. The rotating drum 51 is installed in the above-mentioned protective tube 9. Specifically, as shown in Figure 4 As shown, the disc of the drum 51 is placed on the top surface of the top plate 901, and the straight tube passes through the top plate 901 and the bottom plate 902 in sequence. Figure 5As shown, an arc groove 52 is provided on the inner wall of the straight tube, and the outer contour of the arc groove 52 is roughly U-shaped or roughly V-shaped. If the straight tube is divided into two parts, as shown in FIG. Figure 5 As shown, the arc groove 52 is only opened on the inner wall of a portion of the straight tube, the heights of the starting end and the terminal end of the arc groove 52 are substantially the same, 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 tube 9, and its output end is fixedly connected to the disc of the rotating drum 51, which is used 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 sphere 31.

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

[0053] The process of adjusting the outlet angle of the 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 the right end, so that the outlet of the outlet pipe 32 deviates downward. At this time, the angle between the first axis 1041 and the second axis 321 is as follows: Figure 7 As shown in the first state.

[0054] The first motor 4 drives the rotating drum 51 to rotate 90° counterclockwise around its own axis, and 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 sphere 31 rotates counterclockwise around its own rotation axis, and the right end of the air outlet pipe 32 gradually rises.

[0055] When the rolling block 56 on the round rod 53 slides to a certain position between the starting end and the lowest point of the arc groove 52, the right end outlet of the outlet pipe 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 in a collinear state. Thereafter, as the first motor 4 drives the rotating drum 51 to continue to rotate 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 outlet of the outlet pipe 32 is raised to the first limit state, which is the third state. In the third state, the angle relationship between the first axis 1041 and the second axis 321 is as follows: Figure 7 As shown in the third state.

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

[0057] When the rolling block 56 on the round rod 53 slides to a position between the terminal end and the lowest point of the arc groove 52, the right end outlet of the air outlet pipe 32 is in a horizontal state, which is the fourth state. At this time, the first axis 1041 and the second axis 321 are in a colinear line. Thereafter, as the first motor 4 drives the rotating drum 51 to continue to rotate counterclockwise, the rolling block 56 on the round rod 53 gradually slides to the terminal end of the arc groove 52, and the right end outlet of the air outlet pipe 32 tilts downward 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 shown in FIG. Figure 7 As shown in the fifth state.

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

[0059] In this way, the outlet of the outlet pipe 32 can be freely adjusted within a small angle range. 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, and 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 the product quality.

[0060] As an optional embodiment, Figure 5 As shown, a rectangular hole is provided on the connecting rod 33, and the rectangular hole extends from the top surface of the connecting rod 33 toward its bottom surface. A strip groove 34 is respectively provided on the inner walls on the front and rear sides of the rectangular hole. 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 pin shaft 55 at the bottom of the round rod 53 are respectively inserted into the strip grooves 34 on the inner walls on both sides of the rectangular hole, and the pin shaft 55 can slide left and right in the strip groove 34.

[0061] In this embodiment, if Figure 4As shown, at least one limiting rod 54 is installed on the side wall of the round rod 53, and the limiting rod 54 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 the first rod body and the third rod body are parallel to each other. One 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, and 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 tube 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] The adjustable air outlet also includes a regulating valve 2, which includes a valve body, a valve stem and a valve handle, wherein the valve body is coaxially arranged in the tube cavity of the inner tube 101, and the circumference of the valve body is sealed and connected to the inner wall of the inner tube 101. The valve stem of the regulating valve 2 passes through the inner tube 101 and the outer tube 102, and the valve handle is installed at the top of the valve stem.

[0064] It should be noted that the left air inlet of the regulating valve 2 is connected to the mixed gas supply pipeline through a flange. In this way, by controlling the opening of the regulating valve 2, the flow rate of the mixed gas entering the furnace can be regulated.

[0065] It should be noted that, in the conventional AOD furnace tuyere, after the cooling gas enters the cooling gas chamber 105, it is finally discharged directly into the furnace from the exhaust hole 6 on the right side of the tuyere. Since the number and size of the exhaust holes 6 are fixed in the AOD furnace tuyere of fixed specifications, the flow rate through the tuyere per unit time cannot be controlled, and the cooling effect of the tuyere cannot be controlled, which in turn affects the distribution and stability of the temperature in the furnace and is not conducive to adjusting the composition and pressure of the atmosphere in the furnace.

[0066] In order to solve this technical problem, in this embodiment, a cooling gas flow regulating component 7 is installed in the adjustable air outlet, and the cooling gas flow regulating component 7 is used to adjust the cooling gas flow through the exhaust hole 6 per unit time. Specifically, the cooling gas flow regulating component 7 includes a gear ring 71 and a rotation drive component, such as Figure 6 As shown, the gear ring 71 is in a circular ring shape, and a plurality of meshing teeth are arranged on the outer circumference of the gear ring 71. The side of the gear ring 71 is provided with adjustment holes 72 corresponding to the exhaust holes 6 one by one, and the adjustment holes 72 are exactly the same as the exhaust holes 6. That is, when the gear ring 71 rotates to a certain fixed position, the adjustment holes 72 on the gear ring 71 can be exactly aligned with the exhaust holes 6 on the right side of the side gun 103.

[0067] In this embodiment, the rotation drive assembly includes a second motor 74, a bearing 73 and a gear 75, and the gear 75 is fixed to the output shaft of the second motor 74. Figure 3As shown, an annular groove is provided in the side gun 103, and the annular groove 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, the gear ring 71 is sleeved on the outer ring of the bearing 73, and a cylindrical mounting groove is opened on the side gun 103. The second motor 74 is sealed and installed in the mounting groove. The mounting groove and the annular groove are connected, and the gear 75 at the output end of the second motor 74 is meshed with the meshing teeth on the outer peripheral surface of the gear ring 71.

[0068] In this way, the gear 75 is driven to rotate by the second motor 74. 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 relationship between the adjustment hole 72 on the gear ring 71 and the exhaust hole 6 on the side gun 103, so as to adjust the flow rate of cooling gas passing through the exhaust hole 6 per unit time.

[0069] It should be clear that when the adjustment hole 72 on the gear ring 71 and the exhaust hole 6 on the side gun 103 are completely staggered, 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 basically zero. When the adjustment hole 72 on the gear ring 71 and the exhaust hole 6 on the side gun 103 are completely aligned, the flow rate of the cooling gas through the exhaust hole 6 per unit time is the largest.

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

[0071] In addition, the cooling gas flow rate will affect the composition and pressure of the atmosphere in the furnace, thereby affecting the chemical reaction and composition control of the molten steel. In this embodiment, the cooling gas flow rate can be adjusted to a suitable range, which is conducive to adjusting the composition and pressure of the atmosphere in the furnace.

[0072] In this embodiment, the first motor 4 and the second motor 74 are both DC motors, and the first motor 4 and the second motor 74 are respectively connected to the controller for communication, and 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 opening, closing, direction and speed of a motor is a very mature prior art. The controller usually adjusts the speed of the motor through pulse width modulation (PWM) technology. The duty cycle of the PWM signal determines the average value of the current in the motor winding, thereby changing the speed of the motor. The larger the duty cycle, the higher the motor speed. The controller changes the direction of the motor through an H-bridge circuit. The H-bridge circuit consists of four switches, which change the direction of the current by changing the state of the switch, thereby realizing the forward and reverse rotation of the motor. The controller realizes the opening and closing of the motor by controlling the attraction and release of the relay. Therefore, in this embodiment, the principle of how the controller controls the first motor 4 and the second motor 74 is no longer described.

[0074] Embodiment 2:

[0075] The second embodiment of the present invention provides an argon oxygen decarburization furnace, which is equipped with the adjustable tuyere for the argon oxygen decarburization furnace in the first embodiment.

[0076] In the description of the present invention, it should be noted that the terms "upper", "lower", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0077] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the inside of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

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

Claims

1. An adjustable tuyere for an argon oxygen decarburization furnace, characterized in that: The invention comprises an air vent body (1) and a mixed gas injection angle adjustment assembly (3), wherein the air vent body (1) is provided with a cooling gas cavity (105) and a mixed gas cavity (104) which are isolated from each other and coaxially arranged, the cooling gas cavity (105) surrounds the outside of the mixed gas cavity (104), the mixed gas cavity (104) passes through the air vent body (1) and one end of the mixed gas cavity (104) forms a mixed gas outlet, and at least one exhaust hole (6) which is connected to the cooling gas cavity (105) is provided on a side surface of the air vent body (1) close to the mixed gas outlet; The mixed gas injection angle adjustment component (3) comprises a sphere (31) and an angle adjustment member, the sphere (31) being provided with an outlet pipe (32) penetrating the center of the sphere along a first direction, the sphere (31) being movably mounted in the mixed gas chamber (104) and located at the mixed gas outlet, one end of the outlet pipe (32) forming an outlet for injecting the gas in the mixed gas chamber (104) into the furnace, the angle adjustment member being connected to the sphere (31) and being used to drive the sphere (31) to rotate relative to the mixed gas chamber (104) around a rotation axis when in operation, so as 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 extending along a second direction, the second direction being perpendicular to the first direction.

2. The adjustable tuyere for an argon oxygen decarburization furnace according to claim 1, characterized in that: The tuyere body (1) comprises 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 in the tube 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 surface and a second side surface which 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 surface of the side gun (103). The side gun (103) is provided with a second annular cavity and a circular cavity which are coaxially arranged and isolated from each other along its axial direction. The second annular cavity surrounds the outside of the circular cavity. The circular cavity passes through the side gun (103). The second annular cavity extends from the first side surface of the side gun (103) to a position close to the second side surface thereof. The tube cavity of the inner tube (101) and the circular cavity of the side gun (103) are connected to form the mixed gas cavity (104), the first annular cavity and the second annular cavity are connected to form the cooling gas cavity (105), and the side gun (103) is provided with at least one exhaust hole (6) connected to the second annular cavity.

3. The adjustable tuyere for an argon oxygen decarburization furnace according to claim 2, characterized in that: The angle adjustment member comprises a connecting rod (33) and a lifting drive assembly (5), one end of the connecting rod (33) is connected to the sphere (31), and 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 sphere (31) to drive the sphere (31) to rotate.

4. The adjustable tuyere for an argon oxygen decarburization furnace according to claim 3, characterized in that: The lifting drive assembly (5) comprises a round rod (53), a rotating drum (51) and a first motor (4); the bottom end of the round rod (53) is hinged to one end of the connecting rod (33) away from the sphere (31), and the other end thereof extends into the cylinder cavity of the rotating drum (51); a rolling block (56) is provided on the top side surface of the round rod (53); an arc groove (52) is provided on the inner wall of the rotating drum (51); the contour of the arc groove (52) is V-shaped; 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) for driving the rotating drum (51) to rotate around its own axis.

5. The adjustable tuyere for an argon oxygen decarburization furnace according to claim 4, characterized in that: A circular hole is opened on the outer wall of the outer tube (102), and a protective tube (9) is sealed and installed at the circular hole. A top plate (901) and a bottom plate (902) are installed in the tube cavity of the protective tube (9) in descending order. The top plate (901) and the bottom plate (902) are both annular, and the inner diameter of the bottom plate (902) is larger than the inner diameter of the top plate (901). A limited position 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) comprises a circular disc and a straight tube which are connected and coaxially arranged, the top surface of the straight tube is connected to the bottom surface of the circular disc, the circular disc is placed 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 arranged on the inner wall of the straight tube, and the output end of the first motor (4) is connected to the top surface of the circular disc.

6. The adjustable tuyere 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), and the limiting rod (54) comprises a first rod body, a second rod body and a third rod body which are connected to each other, the first rod body and the second rod body are perpendicular to each other, the first rod body and the third rod body are parallel to each other, one end of the first rod body away from the second rod body is connected to the side wall of the round rod (53), and the third rod body extends into the limiting cavity between the top plate (901) and the bottom plate (902).

7. The adjustable tuyere for an argon oxygen decarburization furnace according to claim 2, characterized in that: It comprises a cooling gas flow regulating component (7), wherein the cooling gas flow regulating component (7) is used to regulate the cooling gas flow passing through the exhaust hole (6) per unit time; The cooling gas flow regulating assembly (7) comprises a gear ring (71) and a rotation driving assembly, the gear ring (71) is in the shape of a circular ring, a plurality of meshing teeth are arranged on the outer peripheral surface of the gear ring (71), and a regulating hole (72) corresponding to the exhaust hole (6) is arranged on the side surface of the gear ring (71), and the regulating hole (72) and the exhaust hole (6) are completely the same; The side gun (103) is provided with an annular groove, which is coaxially arranged with the second annular cavity and is connected with the second annular cavity and the exhaust hole (6). The gear ring (71) is sleeved in the annular groove; the rotary drive assembly is used to drive the gear ring (71) to rotate around its axis. When the gear ring (71) rotates to the first state, the adjustment hole (72) on the gear ring (71) is aligned with the corresponding exhaust hole (6).

8. The adjustable tuyere for an argon oxygen decarburization furnace according to claim 7, characterized in that: The rotary drive assembly comprises a second motor (74) and a gear (75), wherein the gear (75) is fixed on an output shaft of the second motor (74), and the gear (75) is meshed with meshing teeth of the gear ring (71).

9. The adjustable tuyere for an argon oxygen decarburization furnace according to claim 8, characterized in that: A bearing (73) is sleeved in the annular groove, and the gear ring (71) is sleeved on the outer ring of the bearing (73).

10. An argon oxygen decarburization furnace, characterized in that: The invention comprises an adjustable tuyere for an argon oxygen decarburization furnace as described in any one of claims 1 to 9.

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