Argon protection device for continuous casting tundish

Abstract

The utility model relates to continuous casting operation of a steel plant, in particular to an argon protection device for a continuous casting tundish. The utility model particularly relates to production process auxiliary equipment for a tundish steel casting operation area in a continuous casting operation area of a steel plant. The device can automatically lift and rotate so as to adapt to the processes of lifting, argon protection, replacement and the like of the tundish, and the production efficiency and the safety are improved. And the floating seat and the sealing gasket are arranged, so that effective sealing and argon protection of the device on the tundish are ensured, and the operation efficiency and the protection effect of the whole device are improved. Comprising a rotating device, a lifting device, a protection device and a tundish, and the lifting device is located on the rotating device and driven by the rotating device to rotate. The protection device is installed on the lifting device through a connecting column. The protection device comprises a floating seat and an argon pipeline. Wherein a pressure spring and a guide structure are arranged in the floating seat, and a sealing gasket is arranged at the bottom of the floating seat. The argon pipeline is fixed to the connecting column, and pipeline branches of the argon pipeline penetrate through the floating seat and the sealing gasket.

Description

Technical Field

[0001] The utility model relates to continuous casting operation in a steel mill, in particular to an argon protection device for a tundish in continuous casting; and particularly to auxiliary equipment for the production process in the steel pouring operation area of the tundish in the continuous casting operation area of a steel mill. Background Technique

[0002] The steelmaking process flow refers to the whole process of smelting hot metal or scrap steel into qualified molten steel, loading it into a ladle, transporting it to the ladle turntable for continuous casting, pouring the molten steel into the tundish, then diverting it from the tundish into the mold for cooling and solidification, and cutting it into fixed lengths and sending it to the rolling mill for rolling. For the tundish casting process, if the molten steel level in the tundish is not well covered during casting, resulting in the exposure of the molten steel to the air, it will cause the oxidation of the molten steel, affecting the purity quality of the molten steel. Moreover, in the tundish casting area of continuous casting, a large amount of water vapor is generated during the cooling process of the billet. The molten steel in the tundish is not only secondarily oxidized but also has a high hydrogen content in the molten steel, which is extremely harmful to the properties of the steel.

[0003] In view of this situation, generally, at the upper end of the tundish, a cover plate is used and argon is introduced for protection to isolate the tundish from the air during casting. The use of argon is based on the fact that it is an inert gas, which can effectively isolate the air and prevent secondary oxidation. However, this kind of cover plate device needs to be manually covered on the tundish temporarily, and due to the poor contact between this simple cover plate and the tundish, the use effect is not good. Summary of the Invention

[0004] The utility model aims at the defects existing in the prior art and provides an argon protection device for a tundish in continuous casting.

[0005] To achieve the above object, the utility model adopts the following technical scheme. An argon protection device for a tundish in continuous casting includes a slewing device, a lifting device, a protection device, and a tundish, wherein:

[0006] The lifting device is located on the slewing device and is driven by the slewing device to rotate.

[0007] The protection device is installed on the lifting device through a connecting column.

[0008] The protection device includes a floating seat and an argon pipeline. Among them, a compression spring and a guiding structure are arranged inside the floating seat, and a sealing gasket is arranged at the bottom of the floating seat. The argon pipeline is fixed on the connecting column, and the pipeline branch of the argon pipeline penetrates through the floating seat and the sealing gasket for injecting argon into the tundish.

[0009] Specifically, the guiding structure includes a guiding shaft; the floating seat is composed of a bottom plate connected to the connecting column and a floating mounting plate floatingly connected to the bottom plate. A plurality of compression springs are arranged between the bottom plate and the floating mounting plate. Each compression spring is wound around a guiding shaft. One end of the compression spring is connected to the bottom plate, and the other end of the compression spring acts on the floating mounting plate; the bottom of each guiding shaft is fixedly connected to the floating mounting plate. After the top of the guiding shaft sequentially passes through the through hole of the bottom plate and the guiding sleeve arranged on the top of the bottom plate, a limiting retaining ring is provided at the top end to ensure that the guiding shaft will not fall out of the guiding sleeve.

[0010] Specifically, the pipeline branches of the argon gas pipeline sequentially pass through the bottom plate, the floating mounting plate and the sealing gasket for injecting argon gas into the tundish to provide protection.

[0011] Specifically, the slewing device adopts a slewing bearing disc structure, which consists of a mounting base, a slewing disc, an outer fixing ring, a driving gear, a reduction motor and an inner rotating ring. Among them, the outer fixing ring is fixed on the mounting base, and the inner rotating ring is connected to the reduction motor through the driving gear to drive the slewing disc to rotate.

[0012] Specifically, the lifting device includes a column and a support arm. Among them, the column adopts a square frame structure, and parallel guide rails and lead screws are arranged inside the square frame structure; the lead screw is rotatably connected in the notch of the column; the nut is connected to the slider to form a nut-slider structure, and the nut is threadedly connected to the lead screw; the lead screw is driven by a lifting motor and rotates in the notch of the column to drive the slider to slide up and down along the guide rail; the support arm is fixed on the slider.

[0013] Specifically, the protection device is installed at the bottom of the support arm through the connecting column.

[0014] Specifically, the sealing gasket adopts a refractory cotton sealing gasket, which enhances the sealing performance and is resistant to high temperatures.

[0015] Specifically, the number of compression springs, guiding shafts and guiding sleeves is equal, and is at least 4.

[0016] The beneficial effects of the present utility model compared with the prior art.

[0017] The tundish argon protection device of the present utility model can automatically lift and slewing according to the technological process to adapt to the processes such as the hoisting, argon protection and replacement of the tundish, improving the production efficiency and safety. Moreover, the setting of the floating seat and the sealing gasket ensures the effective sealing of the device to the tundish and argon protection, improving the operation efficiency and protection effect of the overall device. Description of the Drawings

[0018] The following further describes the present utility model in conjunction with the drawings and specific embodiments. The protection scope of the present utility model is not limited to the description of the following content.

[0019] Figure 1It is a three-dimensional view of an argon protection device for a continuous casting tundish.

[0020] Figure 2 It is a front view of an argon protection device for a continuous casting tundish.

[0021] Figure 3 It is a top view of an argon protection device for a continuous casting tundish.

[0022] Figure 4 It is an F-F cross-sectional view of an argon protection device for a continuous casting tundish.

[0023] Figure 5 It is a three-dimensional view of a slewing device of an argon protection device for a continuous casting tundish.

[0024] Figure 6 It is a three-dimensional view of a slewing device of an argon protection device for a continuous casting tundish with the slewing disc removed.

[0025] Figure 7 It is a top view of a slewing device of an argon protection device for a continuous casting tundish with the slewing disc removed.

[0026] In the figure, 1 is the slewing device, 2 is the lifting device, 3 is the protection device, and 4 is the tundish;

[0027] 101 is the mounting base, 102 is the slewing disc, 103 is the outer fixing ring, 104 is the driving gear, 105 is the reduction motor, and 106 is the inner rotating ring;

[0028] 202 is the column, 203 is the notch, 204 is the lead screw, 206 is the nut, 207 is the slider, 208 is the guide rail, 209 is the lifting motor, and 210 is the support arm;

[0029] 301 is the connecting column, 302 is the argon pipeline, 303 is the bottom plate, 304 is the floating mounting plate, 305 is the gasket, 306 is the compression spring, 307 is the guide sleeve, 308 is the guide shaft, 309 is the retaining ring, and 310 is the through hole. Specific embodiments

[0030] To make the objectives, technical solutions, and beneficial effects of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0031] As Figure 1-7 shown, the argon protection device for a continuous casting tundish includes a slewing device 1, a lifting device 2, a protection device 3, and a tundish 4, where: the lifting device 2 is located on the slewing device 1 and is driven by the slewing device 1 to rotate.

[0032] The protection device 3 is installed on the lifting device through the connecting column 301; the protection device 3 includes a floating seat and an argon gas pipeline 302; wherein, a compression spring and a guiding structure are arranged inside the floating seat, and a sealing gasket 305 is arranged at the bottom of the floating seat; which is used to ensure the sealed contact with the tundish; the argon gas pipeline 302 is fixed on the connecting column 301, and the pipeline branch of the argon gas pipeline 302 penetrates through the floating seat and the sealing gasket 305, and is used to inject argon gas into the tundish. Wherein, the sealing gasket 305 is a refractory cotton sealing gasket, which is used to enhance the sealing performance and resist high temperature. During the process of covering the tundish, a pressure can be applied to the tundish in real time to deform the sealing gasket, which helps to improve the tightness of the combination of the sealing gasket and the upper edge of the tundish.

[0033] The guiding structure includes a guiding shaft 308; the floating seat is composed of a bottom plate 303 connected to the connecting column 301 and a floating mounting plate 304 floatingly connected to the bottom plate 303. A plurality of compression springs 306 are arranged between the bottom plate 303 and the floating mounting plate 304. Each compression spring 306 is wound around a guiding shaft 308. One end of the compression spring 306 is connected to the bottom plate 303, and the other end of the compression spring 306 acts on the floating mounting plate 303; the bottom of each guiding shaft is fixedly connected to the floating mounting plate 304. After the top of the guiding shaft passes through the through hole of the bottom plate 303 and the guiding sleeve 307 arranged on the top of the bottom plate 303 in sequence, a limiting retaining ring is arranged at the top end to ensure that the guiding shaft will not come out of the guiding sleeve. The pipeline branch of the argon gas pipeline 302 passes through the bottom plate 303, the floating mounting plate 304 and the sealing gasket 305 in sequence, and is used to inject argon gas into the tundish for protection. Wherein, the number of the compression springs 306, the guiding shafts 308 and the guiding sleeves 307 is equal, and is at least 4.

[0034] Preferably, the slewing device 1 adopts a slewing bearing disc structure, which is composed of a mounting base 101, a slewing disc 102, an outer fixing ring 103, a driving gear 104, a reduction motor 105 and an inner rotating ring 106. Among them, the outer fixing ring 103 is fixed on the mounting base 101, and the inner rotating ring 106 is connected to the reduction motor 105 through the driving gear 104 to drive the slewing disc 102 to rotate.

[0035] Specifically, the lifting device 2 includes a column 202 and a support arm 210. The protection device 3 is installed at the bottom of the support arm 210 through the connecting column 301.

[0036] Among them, the column 202 adopts a square frame structure. Parallel guide rails 208 and lead screws 204 are arranged inside the square frame structure; the lead screw 204 is rotatably connected in the notch of the column 202; the lead nut 206 is connected to the slider 207 to form a lead nut-slider structure, and the lead nut 206 is threadedly connected to the lead screw 204; the lead screw is driven by a lifting motor 209 and rotates in the notch of the column 202 to drive the slider to slide up and down along the guide rail 208; the support arm 210 is fixed on the slider 207.

[0037] Example 1, Connection Relationship and Working Description of Argon Protection Device for Continuous Casting Tundish:

[0038] The lifting device is located on the slewing device and is driven by the slewing device to rotate; the slewing device can rotate the entire mechanism by 90 degrees or 180 degrees, facilitating the lifting of the tundish. The lifting device is used to cover and uncover the tundish after the tundish is placed.

[0039] The horizontal support arm is fixed to the lifting device and is driven by the lifting device to move up and down;

[0040] The protection device is installed at the bottom of the support arm and is connected to the bottom of the support arm through a connecting column;

[0041] The protection device includes a floating seat; specifically, the floating seat includes a bottom plate connected to the connecting column and a floating mounting plate 304 floatingly connected to the bottom plate; a plurality of compression springs are arranged between the bottom plate and the floating mounting plate; each compression spring 306 is wound around a guide shaft 308, one end of the compression spring is connected to the bottom plate (303), and the other end of the compression spring abuts against (acts on) the floating mounting plate 304; the bottom of each guide shaft is fixedly connected to the floating mounting plate, and the top of each guide shaft sequentially passes through the through hole on the bottom plate and the guide sleeve above the through hole, and a retaining ring is arranged at the protruding end; the outer diameter of the retaining ring is larger than the inner diameter of the guide sleeve, which is used to prevent the guide shaft from slipping out of the guide sleeve.

[0042] Specifically, the guide shaft passes through the guide sleeve 307, and the guide sleeve is fixed to the top of the bottom plate to guide the guide shaft and the floating plate connected thereto to move up and down. The retaining ring 309 is used to limit the movement range of the floating plate.

[0043] A sealing cushion layer is arranged at the bottom of the floating mounting plate, and the two can be bonded; the sealing cushion layer is made of refractory cotton material (i.e., refractory cotton); an argon pipeline is fixed to the connecting column, and the branch pipe of the argon pipeline is arranged vertically and passes through the bottom plate, the floating mounting plate, and the sealing gasket in sequence for filling inert gas into the tundish.

[0044] The lifting device includes a square-shaped column vertically fixed on the slewing device. A vertical lead screw is rotatably connected in the notch of the square-shaped column. The guide rail 208 is vertically installed in the notch of the column 202. The slider 207 slides up and down along the guide rail 208 and is connected to the support arm; one end of the lead screw 204 passes through the top of the column and is connected to the lifting motor 209, and the other end of the lead screw 204 is rotatably connected to the bottom of the notch of the column 202. The nut 206 is connected to the slider 207 and forms a screw fit with the lead screw 204. When the motor 209 drives the lead screw 204 to rotate, the nut 206 moves up and down along the lead screw 204, driving the slider 207 and the support arm to complete the lifting action.

[0045] The slewing device adopts a slewing bearing disc. The inner rotating ring of the slewing bearing disc is fixedly connected to the slewing disc by screws. The bottom of the column is fixed on the slewing disc. The outer fixed ring of the slewing bearing disc is fixedly connected to the mounting base by screws. And the inner rotating ring is meshed and connected with the driving gear. The driving gear is driven to rotate by a reduction motor, thereby driving the inner rotating ring to rotate, and finally driving the column thereon to rotate.

[0046] The argon gas pipeline 302 is fixed on the connecting column. Through the bottom plate, the floating mounting plate and the gasket, argon gas is filled into the tundish. The gasket fits the upper edge of the tundish to achieve argon protection.

[0047] Embodiment 2: The usage process of the present invention is described in combination with the drawings and the technical solution:

[0048] Step 1: First, by controlling the slewing device, the protection device is rotated 180° (compared with the working station). At this time, it is convenient for manual control of the overhead crane to lift the tundish to the working position.

[0049] Step 2: Then, by controlling the slewing device, the protection device is rotated 180° back above the tundish.

[0050] Step 3: By controlling the lifting motor, the protection device is lowered to a certain position. At this time, this position is where the gasket has contacted the upper edge of the tundish and the compression spring has been compressed by a certain amount, and then the lifting motor stops working.

[0051] Step 4: Start continuously supplying argon gas into the tundish through the argon gas pipeline, and protect the working tundish with argon gas.

[0052] Step 5: After the tundish casting is completed, stop the argon gas supply. The lifting motor acts to lift the protection device by a certain height, and then control the reduction motor to drive the slewing device to rotate 180°, which is convenient for manual replacement of the tundish by the overhead crane.

[0053] The protection device of the present invention adopts a two-degree-of-freedom design, which can realize overall rotation and up-and-down lifting, and meet the actions of covering and uncovering the tundish during casting. At the same time, a buffer mechanism is provided in the protection device part, which can achieve a tighter compaction of the upper edge of the tundish.

[0054] The above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; thus, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope defined by the claims of the present invention.

Claims

1. An argon protection device for a continuous casting tundish, comprising a rotating device (1), a lifting device (2), a protection device (3) and a tundish (4), characterized in that: The lifting device (2) is located on the rotating device (1) and is driven to rotate by the rotating device (1); the protection device (3) is installed on the lifting device via a connecting column (301); The protection device (3) comprises a floating seat and an argon gas pipeline (302); Wherein, a compression spring and a guide structure are arranged inside the floating seat, and a sealing gasket (305) is arranged at the bottom of the floating seat; The argon gas pipeline (302) is fixed on the connecting column (301), and a pipeline branch of the argon gas pipeline (302) penetrates the floating seat and the sealing gasket (305) to be used for injecting argon gas into the tundish.

2. The argon protection device for continuous casting tundish according to claim 1, characterized in that: The guide structure comprises a guide shaft (308); the floating seat comprises a bottom plate (303) connected to the connecting column (301) and a floating mounting plate (304) connected to the bottom plate (303) in a floating manner; a plurality of compression springs (306) are arranged between the bottom plate (303) and the floating mounting plate (304); each compression spring (306) is wound around a guide shaft (308); one end of the compression spring (306) is connected to the bottom plate (303); the other end of the compression spring (306) acts on the floating mounting plate (304); the bottom of each guide shaft (308) is fixedly connected to the floating mounting plate (304); after the top of the guide shaft (308) passes through the through hole of the bottom plate (303) and the guide sleeve (307) arranged on the top of the bottom plate (303) in sequence, a limit stop ring is arranged on the top to ensure that the guide shaft (308) does not fall out of the guide sleeve (307).

3. The argon protection device for continuous casting tundish according to claim 2, characterized in that: The pipeline branches of the argon pipeline (302) pass through the bottom plate (303), the floating mounting plate (304) and the sealing gasket (305) in sequence, and are used to inject argon into the tundish for protection.

4. The argon protection device for continuous casting tundish according to claim 1, characterized in that: The slewing device (1) adopts a slewing support disk structure, which is composed of a mounting base (101), a slewing disk (102), an outer fixed ring (103), a driving gear (104), a reduction motor (105), and an inner rotating ring (106), wherein the outer fixed ring (103) is fixed on the mounting base (101), and the inner rotating ring (106) is connected to the reduction motor (105) via the driving gear (104), thereby driving the slewing disk (102) to rotate.

5. The argon protection device for continuous casting tundish according to claim 1, characterized in that: The lifting device (2) comprises a column (202) and a support arm (210), wherein the column (202) adopts a U-shaped frame structure, and mutually parallel guide rails (208) and a screw rod (204) are arranged in the U-shaped frame structure; the screw rod (204) is rotatably connected in a notch of the column (202); the nut (206) is connected to the slider (207) to form a nut-slider structure, and the nut (206) is threadedly connected to the screw rod (204); the screw rod is driven by a lifting motor (209) to rotate in the notch of the column (202), driving the slider to slide up and down along the guide rail (208); and the support arm (210) is fixed on the slider (207).

6. The argon protection device for continuous casting tundish according to claim 5, characterized in that: The protection device (3) is installed at the bottom of the support arm (210) via a connecting column (301).

7. The argon protection device for continuous casting tundish according to claim 1, characterized in that: The sealing gasket (305) is a fire-resistant cotton sealing gasket.

8. The argon protection device for continuous casting tundish according to claim 2, characterized in that: The number of the compression spring (306), the guide shaft (308), and the guide sleeve (307) is equal, and is at least 4.

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