Butterfly valve ladle bottom argon blowing refining device and its use method

Abstract

The present invention relates to a butterfly valve ladle bottom argon blowing refining device and a method for using the same. The butterfly valve ladle bottom argon blowing refining device comprises a support and a molten steel containing component arranged on the support. The molten steel containing component comprises a ladle tube placed on the support and wall bricks arranged in the ladle tube. A central air permeable brick is embedded in the center of the wall brick, and a plurality of eccentric air permeable bricks are equidistantly arranged along the circumference at the eccentric part. The bottom of the ladle tube is provided with air guide holes corresponding to the central air permeable brick and the eccentric air permeable brick. Finally, when working, the device integrates the functions of eccentric argon blowing and central argon blowing, which can effectively improve the refining effect of molten steel and provide reliability guarantee for the performance of the final butterfly valve product.

Description

Technical Field

[0001] The invention relates to a butterfly valve ladle bottom blowing argon refining device and a use method thereof. Background Art

[0002] The butterfly valve is a simple regulating valve available in a wide range of materials to meet the needs of various operating conditions. Because it must operate at relatively high pressures, molten steel is typically refined with argon during production to improve its quality and ensure the reliability of the final butterfly valve.

[0003] When blowing argon from the ladle bottom, different argon delivery locations can produce different effects. Specifically, the blowing point is 1 / 2 to 2 / 3 of the way along the ladle bottom radius (from the ladle bottom center). The rising bubble flow here will cause a horizontal impact force, thereby promoting the circulation of molten steel, reducing the eddy current zone, and shortening the mixing time. At the same time, this arrangement is conducive to the uniformity of molten steel composition and temperature, and the removal of inclusions, thereby improving molten steel quality. Secondly, blowing from the center of the ladle bottom is conducive to the reaction between the ladle top slag and the molten steel, and has a good desulfurization effect.

[0004] However, in existing argon blowing refining devices, the argon blowing position is usually fixed, that is, it is eccentric to the center of the bottom of the ladle. This makes the refining method single, and the eccentric position is avoided, which makes the circulation route of the molten steel fixed, which is not conducive to the sufficient circulation of the molten steel. Therefore, the refining effect needs to be improved. Summary of the Invention

[0005] The object of the present invention is to provide a butterfly valve ladle bottom blowing argon refining device and a method of using the same to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A butterfly valve ladle bottom blowing argon refining device comprises a support and a molten steel containing component arranged on the support, wherein the molten steel containing component comprises a ladle tube placed on the support and wall bricks arranged in the ladle tube;

[0008] A central air-permeable brick is embedded in the center of the wall brick, and multiple eccentric air-permeable bricks are equidistantly arranged along the circumference of the eccentric part, and the bottom of the steel ladle is provided with air guide holes corresponding to the central air-permeable brick and the eccentric air-permeable brick;

[0009] The butterfly valve ladle bottom blowing argon refining device also includes:

[0010] A horizontal plate is arranged in the support, an assembly plate is rotatably mounted on the horizontal plate, an air blowing head is movably provided on the assembly plate via a shift mechanism, the assembly plate is connected to a rotary drive mechanism installed in the support, and the air blowing head is further connected to an air inlet provided on the outer wall of the support via a flow rate control mechanism and an air guide mechanism;

[0011] Among them, the rotary drive mechanism can drive the blowing head to rotate intermittently in the support, so that the blowing head blows argon into the molten steel through multiple eccentric air bricks in sequence. After the blowing head rotates one circle, the shifting mechanism prompts the blowing head to move along the length direction of the assembly plate so that the blowing head corresponds to the central air brick, and the flow rate control mechanism reduces the impact force of argon on the molten steel.

[0012] As a further solution of the present invention: the rotary drive mechanism includes a driven shaft rotatably mounted in the support and a transverse cylinder slidably sleeved on the driven shaft, the driven shaft is connected to the rotating shaft of the assembly plate through a bevel gear set and a transmission belt, and the transverse cylinder is connected to a threaded driving member provided in the support;

[0013] In which, a straight groove and multiple connected curved grooves are provided on the outer wall of the driven shaft, a ball is provided on the inner wall of the transverse cylinder, and the ball is located in the curved groove, and the curved groove includes a first groove section and a second groove section connected to each other, the first groove section and the straight groove are both arranged along the axial direction of the driven shaft, and the second groove section is arranged along a spiral on the driven shaft.

[0014] As a further embodiment of the present invention, the flow rate control mechanism includes a second pipe member movably mounted on the assembly plate and fixed to the air blowing head, and a first pipe member sealingly and slidingly engaged with the second pipe member and connected to the air guide mechanism, wherein the first pipe member has a tapered portion.

[0015] Among them, a driven plate is slidably provided in the first tube fitting, and the driven plate is connected to a conical piece adapted to the conical portion. Two first inclined grooves are symmetrically provided on the driven plate, and the two first inclined grooves are respectively matched with two groups of elastic pieces provided on the first tube fitting. The elastic pieces are triggered when the blowing head moves along the length direction of the assembly plate, and prompt the conical piece to move axially along the first tube fitting.

[0016] As a further embodiment of the present invention, the elastic member includes a telescopic column sealingly and slidably mounted on the first tube, a first cylindrical spring being sleeved on the outer circumference of the telescopic column, one end of the first cylindrical spring being connected to the outer wall of the first tube, and the other end being connected to a convex ring mounted on the telescopic column;

[0017] Among them, a triangular block is provided at one end of the telescopic column, and a driving column adapted to the first inclined groove is provided at the other end. The driving column passes through the first inclined groove and is slidably connected to the driven plate, and two protruding columns are provided on the second pipe through a connecting rod.

[0018] As a further solution of the present invention: the air guide mechanism includes an annular tube installed in the support and connected to the air inlet, and an annular part provided on the annular tube and capable of sealing and rotating relative to the annular tube, the annular part is fixed to the first pipe, and the annular tube is provided with an annular opening corresponding to the annular part.

[0019] As a further solution of the present invention: the shifting mechanism includes a sliding fitting component installed on the assembly plate and connected to the second pipe, and an elastic trigger structure installed on the transverse plate, and the transverse cylinder is provided with two driving wheels that cooperate with the elastic trigger structure.

[0020] As a further solution of the present invention: the sliding fitting assembly includes a slider slidingly engaged on the assembly plate, two side plates respectively arranged on both sides of the slider, a second inclined groove is provided on the side plate, and a sleeve is also slidably sleeved on the rotating shaft of the assembly plate, and a column adapted for the second inclined groove is fixed on the sleeve, and the column passes through the second inclined groove and is slidably connected to the two side plates.

[0021] As a further solution of the present invention: the elastic trigger structure includes two upright posts arranged on the horizontal plate, a horizontal arm slidably arranged on the two upright posts and rotatably connected to the sleeve, and a trapezoidal plate cooperating with the driving wheel is respectively provided on both sides of the horizontal arm;

[0022] Wherein, a second cylindrical spring is sleeved on the outer periphery of the column, one end of the second cylindrical spring is connected to the transverse plate, and the other end is connected to a boss arranged at one end of the column away from the transverse plate.

[0023] The method for using the butterfly valve ladle bottom blowing argon refining device comprises the following steps:

[0024] Step 1: The blowing head corresponds to the position of one of the eccentric air bricks, and argon is blown into the molten steel from the eccentric position of the ladle bottom;

[0025] Step 2: The rotary drive mechanism drives the blowing head to rotate circumferentially, and the blowing head changes its position in the circumferential direction of the ladle bottom to correspond to multiple eccentric air bricks in sequence;

[0026] In step three, the blowing head completes one circle of rotation, the shift mechanism is triggered, driving the blowing head to move to the center of the ladle bottom, corresponding to the central air brick, and the flow rate control mechanism is triggered to reduce the impact of argon on the molten steel when the blowing head blows argon from the center of the ladle bottom.

[0027] Compared with the prior art, the beneficial effects of the present invention are: the present invention is novel in design. When working, the rotary drive mechanism can drive the blowing head to rotate intermittently at the bottom of the ladle, so that the blowing head can correspond to multiple eccentric air bricks in turn, and blow argon into the molten steel at different eccentric points on the bottom of the ladle, so that the molten steel can have multiple circulation routes, thereby improving the uniformity of the molten steel composition and temperature and the removal of inclusions. Subsequently, the shift mechanism is triggered to drive the blowing head to the center of the ladle bottom, so as to facilitate the reaction between the ladle top slag and the molten steel, and achieve a better desulfurization effect. Therefore, this device integrates the functions of eccentric argon blowing and central argon blowing, which can effectively improve the refining effect of molten steel and provide reliability guarantee for the performance of the final butterfly valve product. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural schematic diagram of an embodiment of a butterfly valve ladle bottom blowing argon refining device.

[0029] Figure 2 This is a top view of an embodiment of a butterfly valve ladle bottom blowing argon refining device.

[0030] Figure 3 This is a bottom view of an embodiment of a butterfly valve ladle bottom blowing argon refining device.

[0031] Figure 4 This is a schematic diagram of the internal structure of a support in an embodiment of a butterfly valve ladle bottom blowing argon refining device.

[0032] Figure 5 This is a schematic structural diagram from another angle inside the support of an embodiment of a butterfly valve ladle bottom blowing argon refining device.

[0033] Figure 6 for Figure 5 A magnified view of the structure at point A in the middle.

[0034] Figure 7 This is a structural schematic diagram of the rotary drive mechanism in one embodiment of a butterfly valve ladle bottom blowing argon refining device.

[0035] Figure 8 for Figure 7 Schematic diagram of the structure from another angle.

[0036] Figure 9 This is a structural schematic diagram of the gas guide mechanism in one embodiment of a butterfly valve ladle bottom blowing argon refining device.

[0037] Figure 10 for Figure 9 Schematic diagram of the structure from another angle.

[0038] Figure 11 for Figure 10 A magnified view of the structure at point B.

[0039] In the figure: 1, ladle drum; 101, air guide hole; 2, wall brick; 3, support; 4, eccentric air brick; 5, central air brick; 6, blowing head; 7, air inlet; 8, annular tube; 801, annular port; 9, annular member; 10, horizontal plate; 11, first pipe member; 1101, tapered portion; 12, second pipe member; 13, tapered member; 14, driven plate; 1401, first inclined groove; 15, telescopic column; 1501, convex ring; 16, triangular block; 17, first cylindrical spring; 18, connecting rod; 180 1. Boss; 19. Assembly plate; 20. Slider; 21. Side plate; 2101. Second inclined groove; 22. Sleeve; 2201. Column; 23. Cross arm; 24. Trapezoidal plate; 25. Column; 2501. Boss; 26. Second cylindrical spring; 27. Screw; 28. Drive motor; 29. Threaded cylinder; 30. Transverse cylinder; 3001. Drive wheel; 31. Driven shaft; 3101. First groove section; 3102. Second groove section; 3103. Straight groove; 32. Bevel gear set; 33. Transmission belt. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] In addition, when an element in the present invention is referred to as being "disposed on" or "positioned on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiment.

[0042] See also Figures 1-11 In an embodiment of the present invention, a butterfly valve ladle bottom blowing argon refining device comprises a support 3 and a molten steel holding component provided on the support 3, wherein the molten steel holding component comprises a ladle tube 1 placed on the support 3 and a wall brick 2 provided in the ladle tube 1;

[0043] A central air-permeable brick 5 is embedded in the center of the wall brick 2, and a plurality of eccentric air-permeable bricks 4 are equidistantly arranged along the circumference at the eccentric part, and air guide holes 101 corresponding to the central air-permeable brick 5 and the eccentric air-permeable brick 4 are provided at the bottom of the ladle tube 1;

[0044] The butterfly valve ladle bottom blowing argon refining device also includes:

[0045] A horizontal plate 10 is provided in the support 3. A mounting plate 19 is rotatably mounted on the horizontal plate 10. An air blowing head 6 is movably provided on the mounting plate 19 via a shift mechanism. The mounting plate 19 is connected to a rotary drive mechanism installed in the support 3. The air blowing head 6 is further connected to an air inlet 7 provided on the outer wall of the support 3 via a flow rate control mechanism and an air guide mechanism.

[0046] Among them, the rotary drive mechanism can drive the blowing head 6 to rotate intermittently in the support 3, so that the blowing head 6 blows argon into the molten steel through multiple eccentric air bricks 4 in turn. After the blowing head 6 rotates one circle, the shifting mechanism prompts the blowing head 6 to move along the length direction of the assembly plate 19, so that the blowing head 6 corresponds to the central air brick 5, and the flow rate control mechanism reduces the impact force of argon on the molten steel.

[0047] It should be noted that the air inlet 7 is connected to an argon pumping device. Specifically, in actual operation, the ladle tube 1 containing molten steel is placed on the support 3. Initially, the air blowing head 6 corresponds to one of the eccentric air bricks 4.

[0048] Then, argon gas is pumped in. Argon gas is blown into the molten steel through the air guide holes 101 and the eccentric air bricks 4. At this time, the rising bubble flow will cause impact force in the horizontal direction, thereby promoting the circulation of the molten steel, reducing the eddy current area, shortening the mixing time, and at the same time being beneficial to the uniformity of the molten steel composition and temperature and the removal of inclusions, thereby improving the quality of the molten steel.

[0049] During the above process, the rotation drive mechanism works to drive the blowing head 6 to rotate intermittently in the support 3, so that the blowing head 6 can correspond to the multiple eccentric air bricks 4 in sequence. Since the position of each eccentric air brick 4 is different, the molten steel can have multiple different circulation routes, thereby effectively improving the sufficiency of the molten steel circulation flow. Accordingly, the uniformity of the molten steel composition and temperature and the removal of inclusions can be improved.

[0050] After the blowing head 6 completes one rotation, the rotary drive mechanism will trigger the shift mechanism, which drives the blowing head 6 to move along the length direction of the assembly plate 19, so that the blowing head 6 corresponds to the central air brick 5. Subsequently, argon gas will be blown into the molten steel from the bottom center of the ladle tube 1, so as to facilitate the reaction between the ladle top slag and the molten steel, thereby achieving a better desulfurization effect.

[0051] It should be noted that compared with central argon blowing, in order to ensure the smooth circulation of molten steel, the impact force of argon on molten steel must be large enough during eccentric argon blowing. However, when central argon blowing is performed, if the impact force remains unabated, it is easy to cause violent churning of the molten steel surface, severe secondary oxidation, large temperature drop and easy slag rolling. In this regard, when the blowing head 6 moves to the central air brick 5, the flow rate control mechanism is triggered to reduce the flow rate of argon, thereby reducing the impact force of argon on molten steel and avoiding a series of problems caused by excessive impact force on the molten steel.

[0052] Please refer again Figure 4 、 Figure 7 as well as Figure 8 The rotary drive mechanism includes a driven shaft 31 rotatably mounted within the support 3 and a transverse cylinder 30 slidably sleeved on the driven shaft 31. The driven shaft 31 is connected to the rotating shaft of the assembly plate 19 via a bevel gear set 32 and a transmission belt 33. The transverse cylinder 30 is connected to a threaded drive member disposed within the support 3. A straight groove 3103 and a plurality of connected curved grooves connecting the straight grooves 3103 are provided on the outer wall of the driven shaft 31. Ball bearings are provided on the inner wall of the transverse cylinder 30 and are located within the curved grooves. The curved grooves include a first groove segment 3101 and a second groove segment 3102 connected to each other. The first groove segment 3101 and the straight groove 3103 are both arranged along the axial direction of the driven shaft 31, and the second groove segment 3102 is arranged along a spiral path on the driven shaft 31.

[0053] In detail, a connecting shaft is rotatably mounted on the transverse plate 10, and the transmission belt 33 is used to connect the rotating shaft of the assembly plate 19 and the connecting shaft. The bevel gear set 32 includes a first bevel gear provided on one end of the driven shaft 31 facing the connecting shaft and a second bevel gear mounted on the connecting shaft, and the second bevel gear is meshed with the first bevel gear.

[0054] Secondly, the threaded drive member can drive the transverse cylinder 30 to slide axially along the driven shaft 31. Specifically, the threaded drive member includes a screw rod 27 rotatably installed in the support 3, and a threaded cylinder 29 sleeved on the screw rod 27 and threadedly connected to the screw rod 27. The threaded cylinder 29 is fixed to the transverse cylinder 30, and a drive motor 28 is also installed on the side of the support 3. The output end of the drive motor 28 is connected to the screw rod 27 for driving the screw rod 27 to rotate forward or reverse.

[0055] Taking the state shown in the accompanying drawings as an example, when the driving motor 28 drives the screw rod 27 to rotate, the threaded cylinder 29 will be threadedly matched with the screw rod 27, so that the threaded cylinder 29 will drive the transverse cylinder 30 to slide on the driven shaft 31 along the axial direction of the driven shaft 31. When the ball rolls along the first groove section 3101, the driven shaft 31 does not rotate, and the blowing head 6 maintains a corresponding relationship with one of the eccentric air-permeable bricks 4. When the ball rolls along the second groove section 3102, it will cause the driven shaft 31 to rotate, thereby The driven shaft 31 drives the assembly plate 19 to rotate through the bevel gear set 32 and the transmission belt 33, so that the blowing head 6 deflects at a certain angle, and the blowing head 6 corresponds to the next eccentric air brick 4 to change the blowing position of the argon gas, so that the circulation route of the molten steel changes. In this way, the blowing head 6 rotates intermittently and corresponds to multiple eccentric air bricks 4 in turn, so that the molten steel can have multiple different circulation routes, thereby improving the adequacy of the molten steel treatment, and improving the uniformity of the molten steel composition and temperature and the removal of inclusions.

[0056] After the ball passes through multiple second groove sections 3102, the assembly plate 19 drives the blowing head 6 to complete a rotation. Then, the ball passes through the straight groove 3103 again. At this time, the shifting mechanism is triggered, prompting the blowing head 6 to move radially along the ladle tube 1, so that the blowing head 6 corresponds to the central air brick 5, and then central argon blowing is performed, which is beneficial to the reaction between the ladle top slag and the molten steel, and achieves a better desulfurization effect.

[0057] Please refer again Figure 9 、 Figure 10 as well as Figure 11The flow rate control mechanism includes a second pipe 12 movably mounted on the assembly plate 19 and fixed to the air blowing head 6, and a first pipe 11 that is sealingly and slidably engaged with the second pipe 12 and connected to the air guide mechanism. The first pipe 11 is formed with a tapered portion 1101. A follower plate 14 is slidably mounted within the first pipe 11. The follower plate 14 is connected to a tapered member 13 that is adapted to the tapered portion 1101. The follower plate 14 is symmetrically provided with two first inclined grooves 1401. The two first inclined grooves 1401 respectively cooperate with two sets of elastic members provided on the first pipe 11. The elastic members are triggered when the air blowing head 6 moves along the length direction of the assembly plate 19, and cause the tapered member 13 to move axially along the first pipe 11.

[0058] The elastic member includes a telescopic column 15 that is sealingly and slidably mounted on the first tube 11. A first cylindrical spring 17 is sheathed around the outer circumference of the telescopic column 15. One end of the first cylindrical spring 17 is connected to the outer wall of the first tube 11, and the other end is connected to a raised ring 1501 mounted on the telescopic column 15. A triangular block 16 is mounted on one end of the telescopic column 15, and a drive column that fits into the first inclined slot 1401 is mounted on the other end. The drive column penetrates the first inclined slot 1401 and is slidably connected to the driven plate 14. Two raised columns 1801 are mounted on the second tube 12 via a connecting rod 18.

[0059] When the shift mechanism is triggered, it can drive the second pipe 12 to slide toward the inside of the first pipe 11 until the air blowing head 6 is transferred from the eccentric air-permeable brick 4 to the central air-permeable brick 5. In the latter part of this process, the protruding column 1801 will act on the inclined surface of the triangular block 16, thereby causing the triangular block 16 to give way, and the telescopic column 15 will slide toward the inside of the first pipe 11. The first cylindrical spring 17 is compressed, and the driving column at the end of the telescopic column 15 slides with the driven plate 14 through the first inclined groove 1401, so that the driven plate 14 can slide and rotate. The plate 14 drives the conical part 13 to move axially along the first pipe 11 close to the second pipe 12. Furthermore, compared with when the blowing head 6 is located at the eccentric air brick 4, after the blowing head 6 is transferred to the central air brick 5, the gap between the conical part 13 and the inner wall of the conical portion 1101 increases. Therefore, the conduction area of argon gas increases. When the subsequent blowing head 6 performs central argon blowing, the impact force of argon gas on the molten steel is reduced, avoiding a series of problems caused by excessive impact force on the molten steel (violent churning of the steel liquid surface, severe secondary oxidation, large temperature drop and easy slag rolling).

[0060] Please refer again Figure 9 and Figure 10The air guide mechanism includes an annular tube 8 installed in the support 3 and connected to the air inlet 7, and an annular member 9 provided on the annular tube 8 and capable of sealing and rotating relative to the annular tube 8. The annular member 9 is fixed to the first pipe 11, and an annular opening 801 corresponding to the annular member 9 is provided on the annular tube 8.

[0061] When refining the molten steel, the argon pumping device pumps the argon gas into the annular tube 8 through the gas inlet 7. Subsequently, the argon gas enters the annular member 9 through the annular opening 801, then enters the first pipe member 11, passes through the gap between the inner wall of the tapered portion 1101 and the tapered member 13, and is finally blown into the molten steel through the second pipe member 12 and the blowing head 6.

[0062] Furthermore, during the processing, the assembly plate 19 drives the blowing head 6 to rotate, and accordingly, the first pipe 11 drives the annular member 9 to rotate on the annular tube 8. The setting of the annular port 801 can ensure that the pumping route of the argon gas can be maintained.

[0063] Please refer again Figure 6 、 Figure 7 、 Figure 8 as well as Figure 9 The shift mechanism includes a sliding fit assembly mounted on the assembly plate 19 and connected to the second tube 12, and an elastic trigger structure mounted on the transverse plate 10. The transverse displacement cylinder 30 is provided with two drive wheels 3001 that cooperate with the elastic trigger structure. The sliding fit assembly includes a slider 20 slidably engaged with the assembly plate 19, and two side plates 21 disposed on either side of the slider 20. The side plates 21 are provided with a second inclined groove 2101. A sleeve 22 is also slidably mounted on the rotating shaft of the assembly plate 19. A column 2201 is fixedly mounted on the sleeve 22, which is adapted to fit the second inclined groove 2101. The column 2201 extends through the second inclined groove 2101 and is slidably connected to the two side plates 21. The elastic trigger structure includes two columns 25 provided on the horizontal plate 10, a horizontal arm 23 slidably provided on the two columns 25 and rotatably connected to the sleeve 22, and a trapezoidal plate 24 is provided on each side of the horizontal arm 23 to cooperate with the driving wheel 3001;

[0064] A second cylindrical spring 26 is sleeved on the outer periphery of the column 25 , one end of the second cylindrical spring 26 is connected to the transverse plate 10 , and the other end is connected to a boss 2501 provided on the end of the column 25 away from the transverse plate 10 .

[0065] After the ball bearings on the inner wall of the transverse cylinder 30 pass through multiple second groove sections 3102, the assembly plate 19 drives the blowing head 6 to complete a rotation. Then, the ball bearings pass through the straight groove 3103 again. At this time, the driving wheel 3001 acts on the inclined surface on the trapezoidal plate 24, causing the trapezoidal plate 24 to give way. Specifically, the trapezoidal plate 24 drives the cross arm 23 to lift, the second column spring 26 is compressed, and the cross arm 23 drives the sleeve 22 to rise on the rotating axis of the assembly plate 19. The column 2201 slides with the side plate 21 through the second inclined groove 2101, causing the side plate 21 to drive the second pipe fitting 12 to shrink toward the first pipe fitting 11 through the slider 20, and the blowing head 6 is transferred to the position corresponding to the central air permeable brick 5 to enter the subsequent central argon blowing.

[0066] As another embodiment of the present invention, a method for using the butterfly valve ladle bottom blowing argon refining device is also proposed, comprising the following steps:

[0067] Step 1: The blowing head 6 corresponds to the position of one of the eccentric air bricks 4, and argon is blown into the molten steel from the eccentric position of the ladle bottom;

[0068] Step 2: The rotary drive mechanism drives the blowing head 6 to rotate circumferentially, and the blowing head 6 changes its position in the circumferential direction of the ladle bottom to correspond to the multiple eccentric air bricks 4 in sequence;

[0069] In step three, the blowing head 6 completes one rotation, the shift mechanism is triggered, driving the blowing head 6 to move to the center of the ladle bottom, corresponding to the central air brick 5, and the flow rate control mechanism is triggered to reduce the impact of argon on the molten steel when the blowing head 6 blows argon from the center of the ladle bottom.

[0070] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0071] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A butterfly valve ladle bottom blowing argon refining device, comprising a support and a molten steel holding component mounted on the support, the molten steel holding component comprising a ladle tube mounted on the support and wall bricks mounted within the ladle tube; a central air permeable brick is embedded in the center of the wall brick, and eccentric air permeable bricks are equidistantly arranged circumferentially at eccentric locations; and air guide holes are provided at the bottom of the ladle tube corresponding to the central air permeable bricks and the eccentric air permeable bricks; characterized in that: Also includes: A horizontal plate is arranged in the support, and an assembly plate is rotatably mounted on the horizontal plate. The assembly plate is provided with an air blowing head via a shift mechanism. The assembly plate is connected to a rotary drive mechanism installed in the support, and the air blowing head is connected to an air inlet of the air guide mechanism on the support via a flow rate control mechanism. The rotary drive mechanism can drive the air blowing head to rotate intermittently in the support so that the air blowing head sequentially blows argon into the molten steel through multiple eccentric air bricks. After the air blowing head rotates one circle, the shift mechanism causes the air blowing head to move along the length direction of the assembly plate so that the air blowing head corresponds to the central air brick, and the flow rate control mechanism reduces the impact of the argon gas on the molten steel. The flow rate control mechanism includes a second tube member fixed to the air blowing head and a first tube member sealingly and slidingly sleeved with the second tube member and connected to the air guide mechanism, wherein a tapered portion is formed on the first tube member; a follower plate is slidably provided in the first tube member, the follower plate is connected to a tapered member adapted to the tapered portion, two first inclined grooves are symmetrically provided on the follower plate, and the two first inclined grooves respectively cooperate with two sets of elastic members provided on the first tube member; the elastic member includes a telescopic column sealingly and slidably provided on the first tube member, and a first cylindrical spring is sleeved on the outer circumference of the telescopic column; a triangular block is provided at one end of the telescopic column, and a driving column adapted to the first inclined groove is provided at the other end, the driving column passes through the first inclined groove and is slidably connected to the driven plate, and two protruding columns are provided on the second tube member through a connecting rod; When the shift mechanism is triggered, the second pipe fitting is driven to slide toward the inside of the first pipe fitting until the blowing head is transferred from the eccentric air-permeable brick to the central air-permeable brick; in the latter part of this process, the convex column acts on the inclined surface of the triangular block, the triangular block gives way, the telescopic column slides toward the inside of the first pipe fitting, the first cylindrical spring is compressed, and the driving column slides with the driven plate through the first inclined groove, so that the driven plate drives the conical part to move closer to the second pipe fitting, the gap between the conical part and the inner wall of the conical part increases, and the conduction area of argon gas increases.

2. The butterfly valve ladle bottom blowing argon refining device according to claim 1 is characterized in that: The rotary drive mechanism includes a driven shaft rotatably mounted in the support and a transverse cylinder slidably sleeved on the driven shaft, the driven shaft being connected to the rotating shaft of the assembly plate via a bevel gear set and a transmission belt, and the transverse cylinder being connected to a threaded driving member provided in the support; In which, a straight groove and multiple connected curved grooves are provided on the outer wall of the driven shaft, a ball is provided on the inner wall of the transverse cylinder, and the ball is located in the curved groove, and the curved groove includes a first groove section and a second groove section connected to each other, the first groove section and the straight groove are both arranged along the axial direction of the driven shaft, and the second groove section is arranged along a spiral on the driven shaft.

3. The butterfly valve ladle bottom argon blowing refining device according to claim 2, characterized in that: The second pipe is movably arranged on the assembly plate. The elastic member is triggered when the blowing head moves along the length direction of the assembly plate, and prompts the conical member to move along the axial direction of the first pipe.

4. The butterfly valve ladle bottom argon blowing refining device according to claim 3, characterized in that: One end of the first cylindrical spring is connected to the outer wall of the first tube, and the other end is connected to the convex ring provided on the telescopic column.

5. The butterfly valve ladle bottom blowing argon refining device according to claim 3, characterized in that: The air guide mechanism includes an annular tube installed in the support and connected to the air inlet, and an annular member provided on the annular tube and capable of sealing and rotating relative to the annular tube. The annular member is fixed to the first pipe member, and the annular tube is provided with an annular opening corresponding to the annular member.

6. The butterfly valve ladle bottom blowing argon refining device according to claim 3, characterized in that: The shift mechanism includes a sliding fitting assembly mounted on the assembly plate and connected to the second pipe, and an elastic trigger structure mounted on the transverse plate. The transverse cylinder is provided with two driving wheels that cooperate with the elastic trigger structure.

7. The butterfly valve ladle bottom blowing argon refining device according to claim 6, characterized in that: The sliding fitting assembly includes a slider slidably engaged with the assembly plate, two side plates respectively arranged on both sides of the slider, a second inclined groove is provided on the side plate, a sleeve is also slidably sleeved on the rotating shaft of the assembly plate, a column adapted for the second inclined groove is fixed on the sleeve, the column passes through the second inclined groove and is slidably connected to the two side plates.

8. The butterfly valve ladle bottom blowing argon refining device according to claim 7, characterized in that: The elastic trigger structure includes two upright posts arranged on the horizontal plate, a horizontal arm slidably arranged on the two upright posts and rotatably connected to the sleeve, and a trapezoidal plate cooperating with the driving wheel is respectively arranged on both sides of the horizontal arm; Wherein, a second cylindrical spring is sleeved on the outer periphery of the column, one end of the second cylindrical spring is connected to the transverse plate, and the other end is connected to a boss arranged at one end of the column away from the transverse plate.

9. The method for using the butterfly valve ladle bottom blowing argon refining device according to claim 1, characterized in that: The following steps are involved: Step 1: The blowing head corresponds to the position of one of the eccentric air bricks, and argon is blown into the molten steel from the eccentric position of the ladle bottom; Step 2: The rotary drive mechanism drives the blowing head to rotate circumferentially, and the blowing head changes its position in the circumferential direction of the ladle bottom to correspond to multiple eccentric air bricks in sequence; In step three, the blowing head completes one circle of rotation, the shift mechanism is triggered, driving the blowing head to move to the center of the ladle bottom, corresponding to the central air brick, and the flow rate control mechanism is triggered to reduce the impact of argon on the molten steel when the blowing head blows argon from the center of the ladle bottom.

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