A baking device for steel ladles used in metallurgical industry

Abstract

The present invention belongs to the technical field of metal casting, and in particular to a baking device for a ladle used for steelmaking in the metallurgical industry, comprising a high-temperature baking furnace, an inert gas pipeline, a liner baking component, an outer shell baking component, an adjustable electric heating component, an evacuation component and a rotating placement component, wherein the inert gas pipeline is installed on the top of the high-temperature baking furnace, the adjustable electric heating component is installed on the top of the high-temperature baking furnace, the liner baking component is installed on the lower end of one side of the adjustable electric heating component, the outer shell baking component is installed on both sides of the liner baking component, the evacuation component is installed on the outer side of the high-temperature baking furnace, and the rotating placement component is rotatably connected to the inner side of the bottom of the high-temperature baking furnace; the oxygen top-blown ladle is fully baked by electric heating, and this baking method can greatly reduce the degree of oxidation of the ladle lining during the baking process; the device first bakes the ladle lining at high temperature to ensure that it is fully preheated and moisture is removed, and then bakes the outer shell after adjusting the heating temperature to avoid the shell from being cracked due to joint baking.

Description

Technical Field

[0001] The invention belongs to the technical field of metal casting, and in particular relates to a baking device for a steel ladle used for steelmaking in the metallurgical industry. Background Art

[0002] Ladle is a container for molten steel, made of steel, lined with refractory bricks, and the molten steel flows out from the bottom for casting. Also called "molten steel ladle", molten steel ladle is used in steel mills and foundries to receive molten steel and perform pouring operations before open-hearth furnaces, electric furnaces or converters. Ladles generally need to be baked after they are newly built and before they are filled with molten steel. Ladle baking is one of the main links in the steelmaking production process.

[0003] The oxygen top-blown ladle is improved on the basis of the converter ladle. For the baking of the oxygen top-blown ladle, the traditional device is generally flame baking. Since the lining of the oxygen top-blown ladle needs to prevent the refractory material from being oxidized during baking, and the necessary condition for flame baking is the participation of oxygen, the temperature of the lining of the oxygen top-blown ladle will gradually increase during heating. If the baking temperature is too high or the time is too long, it may cause thermal stress damage or peeling of the lining material, resulting in casting failure. In addition, the traditional device is full baking, while the outer shell of the ladle mainly plays a protective and supporting role and does not need to withstand excessively high temperatures. Excessively high baking temperatures may cause deformation or damage to the outer shell material of the ladle, and when the inner lining of the ladle is baked at high temperatures, the outer shell will crack and cannot be repaired.

[0004] Therefore, a baking device for a steel ladle used for steelmaking in the metallurgical industry is designed to solve the above problems. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a baking device for a steel ladle used in steelmaking in the metallurgical industry to solve the problems of anti-oxidation of the ladle lining and distributed baking of the inner and outer shells of the oxygen top-blown ladle.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a baking device for a steel ladle used for steelmaking in the metallurgical industry, comprising an electric double baking device, the electric double baking device comprising a high-temperature oven, an inert gas pipeline, an inner liner baking component, an outer shell baking component, an adjustable electric heating component, an evacuation component and a rotating placement component, the inert gas pipeline is installed on the top of the high-temperature oven, the adjustable electric heating component is installed on the top of the high-temperature oven, the inner liner baking component is installed on the lower end of one side of the adjustable electric heating component, the outer shell baking component is installed on both sides of the inner liner baking component, the evacuation component is installed on the outer side of the high-temperature oven, and the rotating placement component is rotatably connected to the inner side of the bottom of the high-temperature oven;

[0007] The high-temperature furnace is used to provide a sealed environment for baking of the oxygen top-blown ladle, the evacuation component is used to evacuate the interior of the high-temperature furnace and recover the inert gas, the inert gas pipeline is used to introduce inert gas into the interior of the high-temperature furnace and prevent the oxidation and loss of the lining refractory material of the oxygen top-blown ladle during the baking process, the outer shell baking component cooperates with the lining baking component to bake the outer shell and lining of the oxygen top-blown ladle, the adjustable electric heating component adopts an electric heating energy baking method to bake the oxygen top-blown ladle and reduce the oxidation degree of the inner lining of the oxygen top-blown ladle, and the rotating placement component is used to position and rotate the oxygen top-blown ladle.

[0008] Preferably, the adjustable electric heating component includes a heating box, a heat-resistant tube, a heat pump, a support frame, a pushing cylinder, a push rod, a galvanized steel telescopic tube and a clamping plate. The heating box is installed on the outside of the high-temperature oven, the input end of the heat pump extends into the interior of the heating box and is installed on the top of the heating box, the heat-resistant tube is installed on the outside of the output end of the heat pump and is fixedly connected to one end of the galvanized steel telescopic tube, the support frame is fixedly connected to the top of the high-temperature oven, the piston end of the pushing cylinder is fixedly connected to the top of the push rod, the clamping plate is clamped to the outside of the bottom of the galvanized steel telescopic tube, and the bottom of the push rod is fixedly connected to both sides of the clamping plate.

[0009] Preferably, the lining baking assembly includes a straight-connecting pipe, a one-way valve and a porous jet rod, the straight-connecting pipe is installed at the bottom of the galvanized steel telescopic pipe, the one-way valve is installed on the outside of the straight-connecting pipe, and the porous jet rod is fixedly connected to the bottom of the straight-connecting pipe and is used for lining baking of the oxygen top-blown ladle.

[0010] Preferably, the shell baking assembly includes an external expansion branch pipe, a second one-way valve and a flaring nozzle, the external expansion branch pipe is installed on both sides of the straight-connecting pipe, the second one-way valve is installed on the outside of the external expansion branch pipe, and the flaring nozzle is installed on the outside of the bottom of the external expansion branch pipe and is used for shell baking of the oxygen top-blown ladle.

[0011] Preferably, the rotating placement assembly includes a heat-resistant long-axis motor, a rotating support shaft, a large belt pulley, a small belt pulley and a conveyor belt. The heat-resistant long-axis motor is installed inside the high-temperature oven, the rotating support shaft is rotatably connected to the inside of the high-temperature oven, the large belt pulley is sleeved on the bottom of the rotating support shaft, the small belt pulley is installed on the outside of the output shaft of the heat-resistant long-axis motor, and the inner surface of the conveyor belt is tightly fitted with the outer surfaces of the large belt pulley and the small belt pulley.

[0012] Preferably, a placing table, a hydraulic cylinder, a positioning bar and an arc-shaped clamping plate are also provided at the upper end of the rotating support shaft. The placing table is installed on the upper end of the rotating support shaft, the hydraulic cylinder is installed on both sides of the top of the placing table, the positioning bar is fixedly connected to the outer side of the output end of the hydraulic cylinder, and one side of the arc-shaped clamping plate is fixedly connected to the surface of the positioning bar.

[0013] Preferably, the evacuation assembly includes a vacuum pump, an air intake pipe, an exhaust pipe and a transfer tank. The air intake pipe passes through the top inner wall of the high-temperature oven and is clamped with the input end of the vacuum pump. The exhaust pipe is installed on the outside of the output end of the vacuum pump. The transfer tank is installed at the lower end of the exhaust pipe and is used to collect air and inert gas.

[0014] Preferably, several groups of filter plates are also arranged inside the transfer tank.

[0015] Preferably, a plurality of groups of air holes with equal inner diameters are formed through the porous air-jet rod.

[0016] Preferably, a fixed bracket, a spline sleeve, a tension spring, a push rod, a locking tongue and a connecting block are also provided on the outside of the straight-connecting pipe. The fixed bracket is installed on both sides of the straight-connecting pipe, the spline sleeve is installed at the lower end of the fixed bracket, the push rod is slidably connected to the bottom of the spline sleeve, the connecting block is installed at the upper end of the push rod, the locking tongue is inserted into the outside of the connecting block, and the two ends of the tension spring are fixedly connected to the opposite side surfaces of the spline sleeve and the connecting block respectively.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, the device adopts electric heating to fully bake the oxygen top-blown ladle. This baking method can greatly reduce the oxidation degree of the ladle lining during the baking process and improve the baking quality.

[0019] 2. In the present invention, the device can evacuate the high-temperature furnace through a vacuum pump and introduce inert gas, thereby preventing the oxidation and loss of the lining refractory material of the oxygen top-blown ladle during the baking process.

[0020] 3. In the present invention, since the ladle shell mainly plays a protective and supporting role and does not need to withstand excessively high temperatures, the device adopts a distributed baking method, first baking the ladle lining at high temperature to ensure that it is fully preheated and moisture is removed, and then the shell is baked after adjusting the heating temperature of the temperature-controlled electric heating tube, thereby avoiding cracking of the shell due to joint baking.

[0021] 4. In the present invention, since the upper slide plate of the traditional ladle sliding water outlet is a protruding structure, when the outward expansion branch pipe touches the ladle, the device can pull the spline shaft below through the tension spring to pull the outward expansion branch pipe upward, thereby avoiding excessive collision with the ladle and damaging the ladle shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the distribution diagram of the temperature-controlled electric heating tube in the present invention;

[0025] Figure 3 It is a structural schematic diagram of the back of the electric heating double baking device in the present invention;

[0026] Figure 4 It is a structural schematic diagram of the rotating placement assembly in the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the large belt pulley in the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the adjustable electric heating component in the present invention;

[0029] Figure 7 It is an enlarged view of the connection between the outward expansion bracket and the straight connection pipe in the present invention;

[0030] Figure 8 It is a schematic diagram of the structure inside the transfer tank of the present invention;

[0031] Fig. 9 It is an enlarged view of the tension spring and the spline sleeve in the present invention.

[0032] In the figure:

[0033] 1. Electric double baking equipment; 2. High temperature oven; 3. Inert gas pipeline; 4. Liner baking assembly; 5. Shell baking assembly; 6. Adjustable electric heating assembly; 7. Vacuum assembly; 8. Rotary placement assembly; 9. Heating box; 10. Heat-resistant pipe; 11. Heat pump; 12. Support frame; 13. Push cylinder; 14. Push rod; 15. Galvanized steel telescopic pipe; 16. Card plate; 17. Direct connection pipe; 18. One-way valve 1; 19. Multi-hole jet rod; 20. External expansion branch pipe; 21. One-way valve 2; 22. Expanded nozzle; 23. Heat-resistant long-axis motor; 24. Rotating support shaft; 25. Large belt pulley; 26. Small belt pulley; 27. Conveyor belt; 28. Placement table; 29. ​​Hydraulic cylinder; 30. Positioning strip; 31. Arc-shaped clamping plate; 32. Vacuum pump; 33. Suction pipe; 34. Exhaust pipe; 35. Transfer tank; 36. Filter plate; 37. Air hole; 38. Temperature-controlled electric heating tube; 39. Fixed bracket; 40. Spline sleeve; 41. Tension spring; 42. Push rod; 43. Lock tongue; 44. Connecting block. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0035] like Figure 1-9 The illustrated device is a baking device for a steel ladle used in the metallurgical industry: the electric double baking device 1 comprises a high-temperature baking furnace 2, an inert gas pipeline 3, an inner liner baking component 4, an outer shell baking component 5, an adjustable electric heating component 6, an evacuation component 7 and a rotating placement component 8, wherein the inert gas pipeline 3 is installed on the top of the high-temperature baking furnace 2, the adjustable electric heating component 6 is installed on the top of the high-temperature baking furnace 2, the inner liner baking component 4 is installed on the lower end of one side of the adjustable electric heating component 6, the outer shell baking component 5 is installed on both sides of the inner liner baking component 4, the evacuation component 7 is installed on the outer side of the high-temperature baking furnace 2, and the rotating placement component 8 is rotatably connected to the inner side of the bottom of the high-temperature baking furnace 2;

[0036] The high-temperature furnace 2 is used to provide a sealed environment for baking the oxygen top-blown ladle. The evacuation component 7 is used to evacuate the inside of the high-temperature furnace 2 and recover the inert gas. The inert gas pipeline 3 is used to introduce inert gas into the interior of the high-temperature furnace 2 and prevent the oxidation and loss of the lining refractory material of the oxygen top-blown ladle during the baking process. The outer shell baking component 5 cooperates with the lining baking component 4 to bake the outer shell and lining of the oxygen top-blown ladle. The adjustable electric heating component 6 uses electric thermal energy to bake the oxygen top-blown ladle and reduce the degree of oxidation of the lining of the oxygen top-blown ladle. The rotating placement component 8 is used to position and rotate the oxygen top-blown ladle.

[0037] The device adopts electric heating to fully bake the oxygen top-blown ladle. This baking method can greatly reduce the degree of oxidation of the ladle lining during the baking process and improve the baking quality. Since the ladle shell mainly plays a protective and supporting role and does not need to withstand excessively high temperatures, the device adopts a distributed baking method, first baking the ladle lining at high temperature to ensure that it is fully preheated and moisture is removed, and then the heating temperature of the temperature-controlled electric heating tube 38 is adjusted before baking the shell, thereby avoiding shell cracking caused by joint baking.

[0038] The adjustable electric heating component 6 includes a heating box 9, a heat-resistant tube 10, a heat pump 11, a support frame 12, a pushing cylinder 13, a push rod 14, a galvanized steel telescopic tube 15 and a clamping plate 16. The heating box 9 is installed on the outside of the high-temperature oven 2, the input end of the heat pump 11 extends into the interior of the heating box 9 and is installed on the top of the heating box 9, the heat-resistant tube 10 is installed on the outside of the output end of the heat pump 11 and is fixedly connected to one end of the galvanized steel telescopic tube 15, the support frame 12 is fixedly connected to the top of the high-temperature oven 2, the piston end of the pushing cylinder 13 is fixedly connected to the top of the push rod 14, the clamping plate 16 is clamped on the outside of the bottom of the galvanized steel telescopic tube 15, and the bottom of the push rod 14 is fixedly connected to both sides of the clamping plate 16.

[0039] The lining baking assembly 4 includes a straight-connecting pipe 17, a one-way valve 18 and a porous jet rod 19. The straight-connecting pipe 17 is installed at the bottom of the galvanized steel telescopic pipe 15, the one-way valve 18 is installed on the outside of the straight-connecting pipe 17, and the porous jet rod 19 is fixedly connected to the bottom of the straight-connecting pipe 17 and is used for lining baking of the oxygen top-blown ladle.

[0040] The shell baking assembly 5 includes an external expansion branch pipe 20, a one-way valve 21 and an expansion nozzle 22. The external expansion branch pipe 20 is installed on both sides of the direct-connection pipe 17, the one-way valve 21 is installed on the outside of the external expansion branch pipe 20, and the expansion nozzle 22 is installed on the outside of the bottom of the external expansion branch pipe 20 and is used for shell baking of the oxygen top-blown ladle.

[0041] The rotating placement assembly 8 includes a heat-resistant long-axis motor 23, a rotating support shaft 24, a large belt pulley 25, a small belt pulley 26 and a conveyor belt 27. The heat-resistant long-axis motor 23 is installed inside the high-temperature oven 2, the rotating support shaft 24 is rotatably connected inside the high-temperature oven 2, the large belt pulley 25 is sleeved on the bottom of the rotating support shaft 24, the small belt pulley 26 is installed on the outside of the output shaft of the heat-resistant long-axis motor 23, and the inner surface of the conveyor belt 27 is tightly fitted with the outer surfaces of the large belt pulley 25 and the small belt pulley 26.

[0042] A placing table 28, a hydraulic cylinder 29, a positioning bar 30 and an arc-shaped clamping plate 31 are also provided at the upper end of the rotating support shaft 24. The placing table 28 is installed at the upper end of the rotating support shaft 24, the hydraulic cylinder 29 is installed on both sides of the top of the placing table 28, the positioning bar 30 is fixedly connected to the outer side of the output end of the hydraulic cylinder 29, and one side of the arc-shaped clamping plate 31 is fixedly connected to the surface of the positioning bar 30.

[0043] The evacuation assembly 7 includes a vacuum pump 32, an air intake pipe 33, an exhaust pipe 34 and a transfer tank 35. The air intake pipe 33 passes through the top inner wall of the high-temperature oven 2 and is connected to the input end of the vacuum pump 32. The exhaust pipe 34 is installed on the outside of the output end of the vacuum pump 32. The transfer tank 35 is installed at the lower end of the exhaust pipe 34 and is used to collect air and inert gas.

[0044] Several groups of filter plates 36 are also arranged inside the transfer tank 35 .

[0045] A plurality of groups of air holes 37 with equal inner diameters are formed through the porous air injection rod 19 .

[0046] The outside of the straight-connecting pipe 17 is also provided with a fixed bracket 39, a spline sleeve 40, a tension spring 41, a push rod 42, a locking tongue 43 and a connecting block 44. The fixed bracket 39 is installed on both sides of the straight-connecting pipe 17, the spline sleeve 40 is installed at the lower end of the fixed bracket 39, the push rod 42 is slidably connected to the bottom of the spline sleeve 40, the connecting block 44 is installed at the upper end of the push rod 42, the locking tongue 43 is inserted into the outside of the connecting block 44, and the two ends of the tension spring 41 are fixedly connected to the opposite side surfaces of the spline sleeve 40 and the connecting block 44 respectively.

[0047] Working principle: Before using the device, the gas outlet end of the inert gas bottle can be connected to the inert gas pipeline 3, then the lifting door of the high-temperature oven 2 can be opened, the oxygen top-blown ladle can be installed on the placement table 28, then the lifting door can be closed, and the vacuum pump 32 on the top can be started. The vacuum pump 32 can first extract the air inside the high-temperature oven 2 and ensure the vacuum of the high-temperature oven 2; then the inert gas is introduced into the high-temperature oven 2 through the inert gas pipeline 3, and the inert gas is filled in the high-temperature oven 2 to protect the ladle and prevent the oxidation of the lining refractory material during high-temperature baking; at the same time, the temperature-controlled electric heating tube 38 inside the heating box 9 is electrically started, and the temperature-controlled electric heating tube 38 dissipates heat and controls the air temperature at 800°C~1200°C. After reaching the specified temperature, start The heat pump 11 above is started to blow hot air from the heat-resistant pipe 10 into the interior of the galvanized steel telescopic tube 15. For ladles of different sizes, the pushing cylinder 13 above the support frame 12 can be started to push the clamping plate 16. The clamping plate 16 stretches and extends the overall length of the galvanized steel telescopic tube 15, so that the porous jet rod 19 below can penetrate into the interior of the ladle. In this process, the valve flap of the one-way valve 18 can be opened, and the one-way valve 21 can be closed at the same time. The high-temperature hot air vertically enters the interior of the porous jet rod 19 from the direct-connection pipe 17, and the air holes 37 opened along the surface of the rod are used to blow the hot air onto the lining of the ladle. The baking time is controlled at 10 hours, so that the steel plate lining is subjected to the high-temperature baking effect to dry all the crystallized water in various refractory materials in the ladle. During high-temperature baking, the bottom heat-resistant long-axis motor 23 can be started to drive the small belt pulley 26 to rotate. The small belt pulley 26 drives the large belt pulley 25 and the upper rotating support shaft 24 and the placement table 28 to slow down the rotation through the conveyor belt 27. During this process, the hydraulic cylinders 29 on both sides can be started to push the arc-shaped clamping plates 31 to approach each other and clamp the outer wall of the ladle, thereby limiting the ladle and improving the stability during rotation; after high-temperature baking, the baking temperature is lowered, and the valve flap of the one-way valve 21 is opened, and the one-way valve 18 is closed. The low-temperature hot air enters the inverted expansion branch pipe 20 and is sprayed from the expansion nozzle 22 to the outer shell of the ladle. Thereby achieving a distributed baking effect; when the upper sliding plate position of the sliding water outlet of the ladle contacts the push rod 42, the push rod 42 pushes the connecting block 44 upward, and the connecting block 44 overcomes the restriction of the locking tongue 43 and disengages from the locking tongue 43. At this time, the tension spring 41 recovers, so that the lower spline sleeve 40 moves to and connects to the upper spline sleeve 40 under the action of tension, so that the lower spline sleeve 40 drives the outer expansion branch pipe 20 to automatically pop up, thereby preventing excessive collision from damaging the ladle shell; after the baking is completed, as the ladle cools down naturally, the vacuum pump 32 can be started again to discharge the inert gas into the transfer tank 35, and the inert gas passes through multiple groups of filter plates 36 and is recycled by the recovery device, while the impurities during baking are fully retained on the filter plates 36, thereby ensuring the clean effect of the recovered inert gas.

[0048] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A baking device for a steel ladle used in the metallurgical industry, comprising an electric double baking device (1), characterized in that: The electric double baking device (1) comprises a high-temperature baking oven (2), an inert gas pipeline (3), an inner liner baking component (4), an outer shell baking component (5), an adjustable electric heating component (6), an evacuation component (7) and a rotating placement component (8), wherein the inert gas pipeline (3) is installed on the top of the high-temperature baking oven (2), the adjustable electric heating component (6) is installed on the top of the high-temperature baking oven (2), the inner liner baking component (4) is installed on the lower end of one side of the adjustable electric heating component (6), the outer shell baking component (5) is installed on both sides of the inner liner baking component (4), the evacuation component (7) is installed on the outer side of the high-temperature baking oven (2), and the rotating placement component (8) is rotatably connected to the inner side of the bottom of the high-temperature baking oven (2); The high-temperature baking furnace (2) is used to provide a sealed environment for baking an oxygen top-blown ladle. The evacuation component (7) is used to evacuate the interior of the high-temperature baking furnace (2) and recover inert gas. The inert gas pipeline (3) is used to introduce inert gas into the interior of the high-temperature baking furnace (2) and prevent oxidation and loss of refractory materials of the lining of the oxygen top-blown ladle during baking. The outer shell baking component (5) cooperates with the inner lining baking component (4) to bake the outer shell and lining of the oxygen top-blown ladle. The adjustable electric heating component (6) adopts an electric heating energy baking method for baking the oxygen top-blown ladle and reducing the oxidation degree of the inner lining of the oxygen top-blown ladle. The rotating placement component (8) is used to position and rotate the oxygen top-blown ladle.

2. The baking device for a steel ladle for steelmaking in the metallurgical industry according to claim 1, characterized in that: The adjustable electric heating component (6) comprises a heating box (9), a heat-resistant tube (10), a heat pump (11), a support frame (12), a pushing cylinder (13), a push rod (14), a galvanized steel telescopic tube (15) and a clamping plate (16). The heating box (9) is installed on the outside of the high-temperature oven (2). The input end of the heat pump (11) extends into the interior of the heating box (9) and is installed on the top of the heating box (9). The heat-resistant tube (10) is installed on the outside of the output end of the heat pump (11) and is fixedly connected to one end of the galvanized steel telescopic tube (15). The support frame (12) is fixedly connected to the top of the high-temperature oven (2). The piston end of the pushing cylinder (13) is fixedly connected to the top of the push rod (14). The clamping plate (16) is clamped to the outside of the bottom of the galvanized steel telescopic tube (15). The bottom of the push rod (14) is fixedly connected to both sides of the clamping plate (16).

3. The baking device for a steel ladle for steelmaking in the metallurgical industry according to claim 2, characterized in that: The liner baking assembly (4) comprises a straight-connecting pipe (17), a one-way valve (18) and a porous air-jet rod (19), wherein the straight-connecting pipe (17) is installed at the bottom of the galvanized steel telescopic pipe (15), the one-way valve (18) is installed on the outside of the straight-connecting pipe (17), and the porous air-jet rod (19) is fixedly connected to the bottom of the straight-connecting pipe (17) and is used for baking the liner of an oxygen top-blown ladle.

4. The baking device for a steel ladle for steelmaking in the metallurgical industry according to claim 3, characterized in that: The shell baking assembly (5) comprises an external expansion branch pipe (20), a second non-return valve (21) and a flaring nozzle (22), wherein the external expansion branch pipe (20) is installed on both sides of the straight-connected pipe (17), the second non-return valve (21) is installed on the outside of the external expansion branch pipe (20), and the flaring nozzle (22) is installed on the outside of the bottom of the external expansion branch pipe (20) and is used for shell baking of an oxygen top-blown ladle.

5. The baking device for a steel ladle for steelmaking in the metallurgical industry according to claim 1, characterized in that: The rotating placement assembly (8) comprises a heat-resistant long-axis motor (23), a rotating support shaft (24), a large belt pulley (25), a small belt pulley (26) and a conveyor belt (27); the heat-resistant long-axis motor (23) is installed inside the high-temperature oven (2); the rotating support shaft (24) is rotatably connected to the inside of the high-temperature oven (2); the large belt pulley (25) is sleeved on the bottom of the rotating support shaft (24); the small belt pulley (26) is installed on the outside of the output shaft of the heat-resistant long-axis motor (23); and the inner surface of the conveyor belt (27) is tightly fitted with the outer surfaces of the large belt pulley (25) and the small belt pulley (26).

6. The baking device for a steel ladle for steelmaking in the metallurgical industry according to claim 5, characterized in that: The upper end of the rotating support shaft (24) is also provided with a placement table (28), a hydraulic cylinder (29), a positioning bar (30) and an arc-shaped clamping plate (31); the placement table (28) is installed on the upper end of the rotating support shaft (24); the hydraulic cylinder (29) is installed on both sides of the top of the placement table (28); the positioning bar (30) is fixedly connected to the outer side of the output end of the hydraulic cylinder (29); and one side of the arc-shaped clamping plate (31) is fixedly connected to the surface of the positioning bar (30).

7. The baking device for a steel ladle for steelmaking in the metallurgical industry according to claim 1, characterized in that: The evacuation assembly (7) comprises a vacuum pump (32), an air intake pipe (33), an exhaust pipe (34) and a transfer tank (35); the air intake pipe (33) passes through the top inner wall of the high-temperature oven (2) and is connected to the input end of the vacuum pump (32); the exhaust pipe (34) is installed on the outside of the output end of the vacuum pump (32); and the transfer tank (35) is installed at the lower end of the exhaust pipe (34) and is used to collect air and inert gas.

8. The baking device for a steel ladle for steelmaking in the metallurgical industry according to claim 7, characterized in that: Several groups of filter plates (36) are also arranged inside the transfer tank (35).

9. The baking device for a steel ladle for steelmaking in the metallurgical industry according to claim 3, characterized in that: The porous air-injection rod (19) is provided with a plurality of groups of air holes (37) with equal inner diameters penetrating therein.

10. The baking device for a steel ladle used for steelmaking in the metallurgical industry according to claim 3, characterized in that: The outer side of the straight-connecting pipe (17) is also provided with a fixed bracket (39), a spline sleeve (40), a tension spring (41), a push rod (42), a locking tongue (43) and a connecting block (44); the fixed bracket (39) is mounted on both sides of the straight-connecting pipe (17); the spline sleeve (40) is mounted on the lower end of the fixed bracket (39); the push rod (42) is slidably connected to the bottom of the spline sleeve (40); the connecting block (44) is mounted on the upper end of the push rod (42); the locking tongue (43) is plugged into the outer side of the connecting block (44); and the two ends of the tension spring (41) are fixedly connected to the opposite side surfaces of the spline sleeve (40) and the connecting block (44), respectively.

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