A clean pouring and drainage device for continuous casting ladle

Abstract

The utility model belongs to the technical field of continuous casting of iron and steel metallurgy, and specifically relates to a clean pouring drainage device for a continuous casting ladle, characterized in that it includes a base, a rotating worktable, a column, a lifting seat and a crossbeam mechanical arm, a column is arranged on the rotating worktable, the column is connected to the crossbeam mechanical arm through the lifting seat, one end of the crossbeam mechanical arm is connected to a drainage trough, and the drainage trough has three degrees of freedom of vertical movement, horizontal movement, and rotation around a rotating axis; the rotating worktable is connected to the base through a rotating axis and a bearing, and a gear ring is arranged between the rotating worktable and the base; a vertical guide rail and a lifting rack are arranged on the column; and a horizontal servo motor is also arranged on the lifting seat. The utility model has the advantages that before pouring, the device diverts and discards the drainage sand section, and then switches to a normal steel-out process, and the switching process does not need to be paused, the normal operation process of the continuous casting ladle is not affected, and the entire pouring time is not increased, and it can also be used in other occasions where high-temperature metal slag removal is required.

Description

Technical Field

[0001] The utility model belongs to the technical field of continuous casting in iron and steel metallurgy, and in particular relates to a clean pouring and drainage device for a continuous casting ladle. Background Art

[0002] Continuous casting is the abbreviation of continuous steel casting. Drainage sand is the filling material used for the sliding water inlet at the bottom of the ladle. Drainage sand has good dispersion fluidity, high refractoriness, no sintering, no clogging, and a steel-out rate and drainage rate of 100%. The operating temperature is ≥1750℃, which can meet the requirements of steelmaking process and is the most ideal refractory material for eccentric furnace steelmaking.

[0003] When the continuous casting ladle starts pouring molten steel, the drainage sand filled in the ladle nozzle will flow out first. If no measures are taken, the drainage sand flowing out each time the pouring starts or the oxygen burning products produced when the oxygen is burned during pouring will enter the continuous casting tundish and become impurities in the molten steel in the tundish. If the impurities in the molten steel in the tundish cannot float up and flow out from the overflow port in time, they will enter the continuous casting billet and form large non-metallic inclusions or surface slag in the billet, thereby reducing the quality of the continuous casting billet and seriously restricting the continuous casting production of high-quality steel grades such as clean steel and special steel.

[0004] At present, in order to prevent the drainage sand from the continuous casting ladle from entering the molten steel in the intermediate tank, relevant research institutes and production enterprises have adopted different technical solutions, but all of them have their own defects. The Chinese utility model patent with application number 202010541513.9 discloses a method for removing drainage sand when the continuous casting ladle starts pouring. A movable guide trough is set in the space between the bottom of the protective sleeve that rises to a high position and the upper edge of the intermediate tank; the continuous casting ladle rises to a high position and rotates directly from the molten steel receiving position to the pouring position. After the pouring is ready and the protective sleeve is installed, the guide trough moves to the working position directly below the protective sleeve, the sliding water outlet of the ladle is opened, and the drainage sand flows into the guide trough and is diverted to the overflow port on the intermediate tank or directly to the overflow tank outside the intermediate tank. After the drainage sand is diverted and the molten steel flows out, the guide trough is moved out to a waiting position outside the intermediate tank that does not affect the lifting of the intermediate tank. The molten steel flows into the intermediate tank, the continuous casting ladle descends to a low position, the protective sleeve is immersed in the molten steel in the intermediate tank, and the pouring is completed. The disadvantage of this solution is that after the drainage sand is diverted and the molten steel flows out, manual judgment is required, which increases the labor intensity of the operators and safety hazards.

[0005] The Chinese utility model patent with application number 201510526147.9 discloses a drainage sand discharge device and a continuous casting ladle pouring method. When the continuous casting ladle is in the molten steel receiving position, the ladle sliding nozzle is opened to discharge the drainage sand, and then the ladle sliding nozzle is closed. At the same time, inert gas is blown into the ladle upper nozzle through the air plug in the nozzle slide mechanism until the ladle rotates to the pouring position for pouring operation. The purpose of blowing argon is to prevent the molten steel at the ladle upper nozzle from condensing after the sand is discharged, which affects the success rate of pouring when the sliding nozzle is opened again. The disadvantages of this scheme are: operating the ladle sliding nozzle twice increases the steps and time of ladle pouring operation, and the molten steel in the ladle upper nozzle area is easy to freeze; adding an air plug in the sliding nozzle mechanism makes the structure complicated and the failure rate increases.

[0006] Another solution is to set a drainage sand recovery device in parallel with the downspout in the sliding nozzle mechanism of the ladle. Before the ladle is poured, the slide mechanism is opened to the recovery position, and the drainage sand flows into the recovery device. After the drainage sand is removed, the slide is quickly opened to the downspout position for normal pouring. The disadvantage is that the recovery device needs to be set in the limited space at the bottom of the ladle, which is difficult to arrange, loading and unloading review, and limited capacity, making it difficult to implement and achieve good results. Utility Model Content

[0007] The utility model aims to provide a continuous casting ladle clean pouring drainage device to overcome the shortcomings of the prior art. The device is arranged near the ladle casting position protection sleeve, and the drainage sand section is diverted and discarded before pouring, and then normal steel tapping begins. The switching process does not require pauses, does not affect the existing ladle pouring preparation process, does not increase the entire pouring time, avoids the drainage sand from entering the tundish, and improves the purity of the molten steel.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A continuous casting ladle clean pouring drainage device, characterized in that it includes a base, a rotating worktable, a column, a lifting seat and a crossbeam mechanical arm. The base is provided with a rotating worktable, and the rotating worktable is provided with a column. The column is connected to the crossbeam mechanical arm through the lifting seat, and one end of the crossbeam mechanical arm is connected to a drainage trough, and the drainage trough has three degrees of freedom of vertical movement, horizontal movement, and rotation around a rotating axis. The device is arranged next to the intermediate tank, and the drainage trough corresponds to the slag discharge hole of the ladle sliding nozzle of the casting station under the control of a controller, and the opening of the protective sleeve corresponds to the steel outlet hole of the ladle sliding nozzle; the rotating worktable is connected to the base through a rotating shaft and a bearing, and the rotating worktable and the base are connected. A gear ring is provided, and a rotary servo motor is provided on the rotary workbench. The shaft end of the rotary servo motor is connected to the rotary gear, and the rotary gear is meshed with the gear ring; a vertical guide rail and a lifting rack are provided on the column, and the vertical servo motor is provided on the lifting seat, and the lifting seat is movably connected to the vertical guide rail on the column, and the vertical servo motor is meshed with the lifting rack through the lifting gear; a horizontal servo motor is also provided on the lifting seat, and a translation guide rail and a translation rack are provided on the crossbeam mechanical arm, and the lifting seat is movably connected to the translation guide rail on the crossbeam mechanical arm, and the output end of the horizontal servo motor is connected to the translation gear, and the translation gear is meshed with the translation rack; a balancing cylinder is provided on the top of the column, and the piston end of the balancing cylinder is connected to the lifting seat.

[0010] Furthermore, the drainage trough includes a flange and a hollow tube body, the hollow tube body consists of a vertical section, a transition section and a guide section, the outer side of the tube body is a steel structure, the steel structure is lined with a refractory material layer with a thickness of 30-50mm, and the central axis angle α between the vertical section and the guide section is 90-150°.

[0011] Furthermore, one end of the sliding plate on the sliding water outlet of the ladle is connected to the hydraulic cylinder push rod, and the sliding plate has three working positions: full sealing position, slag discharge position, and steel tapping position.

[0012] Furthermore, the crossbeam robotic arm has a working position and a waiting position. When the crossbeam robotic arm is in the working position, the drainage trough extends forward and is opposite to the slag discharge hole. When the crossbeam robotic arm is in the waiting position, the drainage trough retreats to a distance of 800mm-2000mm from the sliding water outlet of the ladle, without affecting the lifting of the intermediate tank.

[0013] Furthermore, the outlet direction of the guide section of the drainage trough has an angle β of 90-150° with the length direction of the crossbeam mechanical arm.

[0014] Furthermore, a hydraulic buffer device is provided in the balancing oil cylinder.

[0015] Furthermore, the vertical servo motor is provided with a power-off brake to prevent the workpiece from accidentally descending or falling.

[0016] Furthermore, at least one elastic plunger hole is provided on the flange.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1) The device is arranged near the protective sleeve of the ladle pouring position. The continuous casting ladle rotates directly from the molten steel waiting position to the pouring position. Before pouring, the device diverts and discards the drainage sand section, and then switches to the normal steel tapping process. The switching process does not need to be paused, the normal operation process of the continuous casting ladle is not affected, and the entire pouring time is not increased;

[0019] 2) The device can realize the removal of drainage sand during automatic pouring, and can also realize the removal of drainage sand and oxygen burning products during oxygen-burning pouring. The removal rate of drainage sand and oxygen-burning products can reach more than 98%, and the removal effect is good.

[0020] 3) The device has the characteristics of high degree of automation, low labor operation cost, significant effect in improving the purity of molten steel, stable performance, high safety and reliability, convenient operation, long-term continuous operation, and wide application range. It can also be used in other occasions requiring high-temperature metal slag removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0022] Figure 2 yes Figure 1 posterior axonal view;

[0023] Figure 3 This is a schematic diagram of the drainage trough structure in the embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the installation angle of the drainage groove in the embodiment of the utility model;

[0025] Figure 5 This is a schematic diagram of the ladle sliding nozzle structure in the embodiment of the utility model;

[0026] Figure 6 It is a schematic diagram of the application status of an embodiment of the utility model.

[0027] In the figure: 1-continuous casting ladle; 2-ladle turret; 3-ladle sliding water inlet; 4-protective sleeve; 5-drainage device; 6-overflow tank; 7-intermediate tank; 8-balancing cylinder; 9-flange; 11-hollow tube; 12-laser ranging sensor; 13-base; 14-rotating workbench; 15-column; 16-crossbeam mechanical arm; 17-elastic plunger hole; 18-drainage groove; 19-rotating shaft; 20-gear ring; 21-rotating servo motor; 22-rotating gear; 23-vertical guide rail; 24-lifting rack; 25-vertical servo motor; 26-lifting seat; 27-horizontal servo motor; 28-translational guide rail; 29-translational rack; 30-vertical section; 31-transition section; 32-guide section; 33-sliding plate; 34-hydraulic cylinder push rod. DETAILED DESCRIPTION

[0028] The technical solution of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0029] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the utility model. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0030] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the utility model claimed, but only represents the selected embodiments of the utility model.

[0031] like Figure 1-2The figure is a schematic diagram of the structure of an embodiment of a clean pouring and drainage device for a continuous casting ladle of the utility model, comprising a base 13, a rotating table 14, a column 15, a lifting seat 26 and a crossbeam mechanical arm 16. The base 13 is provided with a rotating table 14, and the rotating table 14 is provided with a column 15. The column 15 is connected to the crossbeam mechanical arm 16 through the lifting seat 26. One end of the crossbeam mechanical arm 16 is connected to a drainage trough 18. The drainage trough 18 has three degrees of freedom of vertical movement, horizontal movement, and rotation around a rotating axis 19. The device is arranged next to the intermediate tank 7. The drainage trough 18 corresponds to the slag discharge hole of the ladle sliding nozzle 3 of the casting station under the control of the controller, and the opening of the protective sleeve 4 corresponds to the steel outlet hole of the ladle sliding nozzle 3; the rotating table 14 is connected to the base 13 through a rotating shaft 19 and a bearing, a gear ring 20 is provided between the rotating table 14 and the base 13, and a rotating servo motor 21 is arranged on the rotating table 1 4, the shaft end of the rotary servo motor 21 is connected to the rotary gear, and the rotary gear is meshed with the gear ring 20; a vertical guide rail 23 and a lifting rack 24 are provided on the column 15, and the vertical servo motor 25 is arranged on the lifting seat 26, and the lifting seat 26 is movably connected to the vertical guide rail 23 on the column 15, and the vertical servo motor 25 is meshed with the lifting rack 24 through a lifting gear (not shown in the figure); a horizontal servo motor 27 is also provided on the lifting seat 26, and a translation guide rail 28 and a translation rack 29 are provided on the crossbeam mechanical arm 16, and the lifting seat 26 is movably connected to the translation guide rail 28 on the crossbeam mechanical arm 16, and the output end of the horizontal servo motor 27 is connected to the translation gear (not shown in the figure), and the translation gear is meshed with the translation rack 29; a balancing cylinder 8 is provided on the top of the column 15, and the piston end of the balancing cylinder 8 is connected to the lifting seat 26, and the function of the balancing cylinder 8 is to assist in pulling the lifting seat 26 to avoid the risk of tipping over due to unstable center of gravity.

[0032] In order to improve the safety performance, a hydraulic buffer device is provided in the balancing oil cylinder 8, which relies on hydraulic damping to buffer and decelerate the object acting on it to a stop, and plays a certain degree of protection role for the balancing oil cylinder. The vertical servo motor 25 is equipped with a power-off brake to prevent the workpiece from accidentally falling or dropping.

[0033] See Figure 3-Figure 4The drainage trough 18 includes a flange 9 and a hollow tube body 11. The hollow tube body 11 is composed of a vertical section 30, a transition section 31 and a guide section 32. The outer side of the tube body is a steel structure, and the steel structure is lined with a refractory material layer with a thickness of 30-50mm. The central axis angle α between the vertical section 30 and the guide section 32 is 120-150°, and the guide section of the drainage trough 18 has an angle β of 90-120° with the length direction of the crossbeam mechanical arm 16. The hollow tube body 11 has the ability to receive a small amount of molten steel in a short time. The drainage trough 18 can be reused and needs to be replaced when the steel sticking is serious. Two elastic plunger holes 17 are provided on the flange 9. When the drainage trough 18 needs to be replaced, the elastic plunger can quickly position the flange 9 and the crossbeam mechanical arm 16, and then tighten them with bolts.

[0034] The controller is connected to the laser distance sensor 12 through a cable. After the laser distance sensor 12 detects that the waiting ladle is in place, the controller instructs the drainage trough 18 to move to just below the ladle slag discharge hole in the pouring position. The crossbeam mechanical arm 16 has a working position and a waiting position. When the crossbeam is in the working position, the drainage trough 18 extends forward to face the slag discharge hole. When the crossbeam mechanical arm 16 is in the waiting position, the drainage trough 18 retreats to a distance of 3800mm-2000mm from the ladle sliding water outlet, which does not affect the lifting of the intermediate tank.

[0035] See Figure 5 One end of the sliding plate 33 on the ladle sliding water outlet 3 is connected to the hydraulic cylinder push rod 34. The sliding plate has three working positions: full sealing position, slag discharge position, and steel tapping position, so that the drainage sand and high-quality molten steel can flow out from their respective outlets on the ladle sliding water outlet 3, reducing the contamination of the molten steel by the drainage sand.

[0036] In this embodiment, when the continuous casting ladle 1 rises to the highest position, the distance between the bottom of the protective sleeve 4 at the pouring position and the upper edge of the intermediate tank 7 is 200 mm to 350 mm. The height and width of the guide groove 18 are sufficient to allow the drainage sand to fall completely into the working position without overflowing, and the length is sufficient to guide the drainage sand to the overflow port on the intermediate tank 7 or directly to the overflow tank 6 outside the intermediate tank 7.

[0037] See Figure 6When the embodiment of the utility model is applied, the ladle turret 2 can rotate 360°, and the ladle turret 2 is provided with two swivel arms that can be raised and lowered to receive the continuous casting ladle 1. At the end of the pouring of the previous ladle of molten steel (pouring station B), the next ladle of molten steel to be replaced (waiting station A) is hoisted to the swivel arm at the molten steel waiting position, and the preparation work of the ladle sliding nozzle 3 is completed (such as installing the oil cylinder, gas pipeline, etc.). The continuous casting ladle 1 can be replaced when the swivel arm is in a high position or a low position, but the ladle turret 2 must be in a high position to rotate when the continuous casting ladle on the swivel arm is in a high position. After the previous ladle of molten steel in the pouring position is poured, its ladle sliding nozzle 3 is closed, the continuous casting ladle 1 rises to a high position, the protective sleeve 4 (commonly known as the ladle long nozzle) is removed, the ladle turret 2 rotates 180°, and the next ladle of molten steel is in the pouring position.

[0038] The laser distance sensor 12 detects the position of the ladle outlet. Before the ladle moves to the pouring position, the guide groove 18 is moved to the bottom of the slag discharge hole in advance. The ladle sliding nozzle 3 is opened to the slag discharge position, and the diversion sand is diverted to flow out. When the diversion sand is emptied and molten steel flows out, the ladle sliding nozzle 3 is switched to the steel discharge position, and the molten steel flows into the intermediate tank 7 through the protective sleeve 4. The continuous casting ladle 1 drops to the low position, and the protective sleeve 4 is immersed in the molten steel in the intermediate tank 7, completing the pouring.

[0039] At the same time, the guide groove 18 moves backward to the waiting position outside the intermediate tank 7 without affecting the lifting of the intermediate tank 7. The guide groove 18 moves to the working position below the side of the protective sleeve 4, but cannot contact or collide with it. If the molten steel cannot flow out automatically during the diversion sand diversion process, the diversion groove 18 and the protective sleeve 4 do not need to be moved out, and the oxygen burning operation is directly carried out. The diversion sand and the oxygen burning product fall into the guide groove 18 and are diverted to the overflow tank 6. When the movement mode of the guide groove 18 is swinging, the maximum range of motion in height does not exceed 100mm.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clean pouring and drainage device for a continuous casting ladle, characterized in that: It includes a base, a rotating worktable, a column, a lifting seat and a crossbeam mechanical arm. The base is provided with a rotating worktable, and the rotating worktable is provided with a column. The column is connected to the crossbeam mechanical arm through the lifting seat. One end of the crossbeam mechanical arm is connected to a drainage trough. The drainage trough has three degrees of freedom: vertical movement, horizontal movement, and rotation around a rotating axis. The device is arranged next to the intermediate tank. The drainage trough corresponds to the slag discharge hole of the ladle sliding nozzle of the casting station under the control of the controller, and the opening of the protective sleeve corresponds to the steel outlet hole of the ladle sliding nozzle; the rotating worktable is connected to the base through a rotating shaft and a bearing, and a gear ring is provided between the rotating worktable and the base. The rotating servo motor The machine is arranged on a rotating workbench, the shaft end of the rotating servo motor is connected to the rotating gear, and the rotating gear is meshed with the gear ring; a vertical guide rail and a lifting rack are arranged on the column, the vertical servo motor is arranged on the lifting seat, the lifting seat is movably connected to the vertical guide rail on the column, and the vertical servo motor is meshed with the lifting rack through the lifting gear; a horizontal servo motor is also arranged on the lifting seat, a translation guide rail and a translation rack are arranged on the crossbeam mechanical arm, the lifting seat is movably connected to the translation guide rail on the crossbeam mechanical arm, the output end of the horizontal servo motor is connected to the translation gear, and the translation gear is meshed with the translation rack; a balancing cylinder is arranged on the top of the column, and the piston end of the balancing cylinder is connected to the lifting seat.

2. A clean pouring and drainage device for a continuous casting ladle according to claim 1, characterized in that: The drainage trough includes a flange and a hollow tube body, the hollow tube body consists of a vertical section, a transition section and a guide section, the outer side of the tube body is a steel structure, the steel structure is lined with a refractory material layer with a thickness of 30-50mm, and the central axis angle α of the vertical section and the guide section is 90-150°.

3. The clean pouring and drainage device for a continuous casting ladle according to claim 1, characterized in that: One end of the sliding plate on the sliding water outlet of the ladle is connected to the hydraulic cylinder push rod, and the sliding plate has three working positions: full sealing position, slag discharge position, and steel tapping position.

4. The clean pouring and drainage device for a continuous casting ladle according to claim 1, characterized in that: The crossbeam mechanical arm has a working position and a waiting position. When the crossbeam mechanical arm is in the working position, the drainage trough extends forward and is opposite to the slag discharge hole. When the crossbeam mechanical arm is in the waiting position, the drainage trough retreats to a distance of 800mm-2000mm from the sliding water outlet of the ladle, without affecting the lifting of the intermediate tank.

5. The clean pouring and drainage device for a continuous casting ladle according to claim 2, characterized in that: The outlet direction of the guide section of the drainage trough and the length direction of the crossbeam mechanical arm have an angle β of 90-150°.

6. The clean pouring and drainage device for a continuous casting ladle according to claim 1, characterized in that: A hydraulic buffer device is arranged in the balancing oil cylinder.

7. The clean pouring and drainage device for a continuous casting ladle according to claim 1, characterized in that: The vertical servo motor is provided with a power-off brake to prevent the workpiece from accidentally descending or falling.

8. The clean pouring and drainage device for a continuous casting ladle according to claim 2, characterized in that: At least one elastic plunger hole is provided on the flange.

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