Stopper rod quick-changing device for intermediate tank of continuous casting machine

Abstract

The invention relates to the field of molten steel smelting equipment, in particular to a stopper rod quick-changing device of a continuous casting machine tundish, which comprises a plugging cover, a sliding hole, an elastic layer and a locking nut, the plugging cover is cylindrical, the plugging cover is coaxially provided with the sliding hole, the plugging cover is sleeved on the periphery of a screw rod through the sliding hole, the screw rod is in sliding connection with the plugging cover, and the elastic layer is arranged on the elastic layer. The face, close to the stopper rod, of the plugging cover is fixedly connected with an elastic layer, a lead screw coaxially penetrates through the elastic layer, the lead screw is in threaded fit with a locking nut, and the locking nut is located above the plugging cover. The problems that in the prior art, when scrap iron or hard impurities are attached to the upper wall of the stopper rod and the gland is pressed down by the fastening nut to be attached to the stopper rod, the structure of the stopper rod and the gland is damaged, and a gap is formed are solved, the sealing performance and safety of the replacing device are improved, and the service life of the replacing device and the stopper rod is further prolonged.

Description

Technical Field

[0001] The invention relates to the field of molten steel smelting equipment, in particular to a stopper rod quick-changing device for a tundish of a continuous casting machine. Background Art

[0002] The stopper rod is a refractory rod installed in the steel ladle and controls the opening and closing of the water inlet and the flow of molten steel by lifting and displacement. It is also called a ceramic stopper rod. The stopper rod is used in a high-temperature environment for a long time. Because the tip of the rod is severely eroded by the high-temperature molten steel, the stopper rod often fails to control the flow. It is a consumable part. The stopper rod is used in a high-temperature environment for a long time. Because the tip of the rod is severely eroded by the high-temperature molten steel, the stopper rod often fails to control the flow. It is a consumable part and often needs to be replaced. The original online replacement technology for the stopper rod is: weld a movable cover plate of the tundish, and use a crane to put the welded cover plate on the tundish during the interval between the ladle stopping and pouring. The personnel stand on the welded cover plate, put the stopper rod into the big arm of the actuator, and then put the ladle on the big ladle pipe for pouring. Then the personnel go up to the tundish and go around the south side of the ladle to adjust the stopper rod until the flow is controllable. However, this method of operation on the tundish has safety hazards. When the crane hoists the cover plate, the operation of the crane operator cannot be guaranteed, resulting in safety problems for the personnel replacing the stopper rod on the tundish. The temperature of the tundish is high, the heat radiation is large, and the operation is labor-intensive.

[0003] In order to solve the above problems, a device for replacing the tundish stopper rod online is proposed in a Chinese patent with publication number CN215879863U. The spare stopper rod is baked and preheated. After preheating, the stopper rod is connected to the lower end of the screw, the gland is tightened, and then the fastening nut is tightened. The drag rod is lifted to drive the stopper rod, and the stopper rod is sent to the upper water inlet. The drag rod is hooked with the buoyancy positioning hook to prevent the stopper rod from swinging under the buoyancy of the molten steel, which is convenient for installation. The upper part of the screw is clamped on the actuator connecting arm through adjustment, and the handle of the cross lock nut is hooked with the lock nut fastener through the hook head part at the front end. The cross lock nut is continuously tightened so that the clamping pad 1 and the clamping pad 2 clamp the actuator connecting arm. The stopper rod is fixed. Fine-tuning the stopper rod can also control the injection flow. Then the lock nut fastener and the buoyancy positioning hook are removed, and the hexagonal protrusion on the drag rod is twisted with a wrench to remove the drag rod. The stopper rod can be used normally.

[0004] The disadvantage is that when iron filings or hard impurities adhere to the upper wall of the stopper rod, when the tightening nut presses down the pressure cover and fits the stopper rod, not only will the structures of the two be damaged, but a gap will also be formed, which not only affects the sealing and safety of the replacement device, but also shortens the service life of the replacement device and the stopper rod. Summary of the invention

[0005] The embodiment of the present application provides a stopper rod quick-change device for the intermediate tank of a continuous casting machine, thereby solving the problem in the comparative document that when iron filings or hard impurities adhere to the upper wall of the stopper rod, the tightening nut presses down the pressure cover and the stopper rod to fit together, causing structural damage to the two and forming a gap. The embodiment of the present application improves the sealing and safety of the replacement device, and also increases the service life of the replacement device and the stopper rod.

[0006] The embodiment of the present application provides a stopper rod quick-change device for a continuous casting machine tundish, comprising a displacement device, a stopper rod, and a sealing device;

[0007] The displacement device comprises a screw rod;

[0008] The inner wall of the stopper rod is provided with a threaded hole, the threaded hole of the stopper rod is matched with the thread at the bottom end of the screw rod, the sealing device is movably connected with the outer periphery of the screw rod, and the sealing device is used to prevent the molten steel and high-temperature gas in the upper water inlet from being discharged from the upper outlet of the stopper rod;

[0009] The sealing device comprises a sealing cover, a sliding hole, an elastic layer, and a locking nut;

[0010] The blocking cover is cylindrical in shape, and a sliding hole is coaxially provided on the blocking cover. The blocking cover is sleeved on the outer periphery of the screw rod through the sliding hole, and the screw rod is slidably connected with the blocking cover;

[0011] The surface of the plugging cover close to the plug rod is fixedly connected to the elastic layer, and the screw rod coaxially penetrates the elastic layer;

[0012] The screw rod is threadably matched with the locking nut, and the locking nut is located above the blocking cover.

[0013] Furthermore, the elastic layer is made of elastic metal.

[0014] Furthermore, the screw rod coaxially penetrates to form a through hole, and the through hole is communicated with the inner cavity of the stopper rod.

[0015] Furthermore, the stopper rod quick-change device further includes a fixing device;

[0016] The fixing device comprises a connecting nut, a fastening nut and a pressing pad;

[0017] The connecting nut is matched with the thread of the screw rod, and the connecting nut is located above the locking nut;

[0018] The fastening nut is matched with the thread of the screw rod, and the fastening nut is located between the connecting nut and the connecting nut;

[0019] The surface of the connecting nut close to the fastening nut is fixedly connected to the compression pad, and the surface of the fastening nut close to the connecting nut is also fixedly connected to the compression pad.

[0020] Furthermore, the outer circumference of the fastening nut is equidistantly fixedly connected to four cylindrical connecting rods.

[0021] Furthermore, the stopper rod quick-change device further includes a stabilizing device;

[0022] The stabilizing device comprises an extension rod, a towing rod, and a friction block;

[0023] The outer periphery of the connecting nut is fixedly connected to the extension rod;

[0024] One end of the extension rod away from the connecting nut is movably connected to the towing rod;

[0025] The outer periphery of the tow bar is fixedly connected to a friction block with a hexagonal cross section.

[0026] Furthermore, the stopper rod quick-change device further includes a buoyancy positioning hook;

[0027] The buoyancy positioning hook cooperates with the towing rod so that when the stopper rod is impacted by the molten steel in the upper water inlet, the stopper rod and the quick-change device will not float.

[0028] Furthermore, the stopper rod quick-change device further includes a locking rod;

[0029] The locking rod is L-shaped, and the locking rod hooks one of the connecting rods and drives the connecting rod to rotate, so that the connecting nut and the pressing pad move downward, so that the connecting arm is locked by the connecting nut and the fastening nut.

[0030] Furthermore, the sealing device also includes a cooling bag;

[0031] An annular cavity is provided in the elastic layer, an annular cooling bag is fixedly connected in the cavity, and the cooling bag is filled with water.

[0032] Furthermore, the sealing device also includes a bump and a balloon;

[0033] The elastic layer is in the shape of an annular tube as a whole, and a surface of the elastic layer close to the stopper rod is fixedly connected with a plurality of semicircular protrusions at equal distances, the plurality of protrusions form a wavy surface, and a surface of the stopper rod close to the elastic layer is provided with grooves that fit with the plurality of protrusions;

[0034] A balloon is arranged in each of the protrusions, a plurality of the balloons are filled with water, and a plurality of the balloons are connected to the cooling bag.

[0035] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0036] Firstly, an elastic layer made of elastic metal is fixedly connected to the contact surface between the sealing cover and the stopper rod to prevent the iron filings and hard impurities that may remain on the upper wall of the stopper rod from directly damaging the sealing cover and the stopper rod. At the same time, since the elastic layer has excellent deformation characteristics, it can deform to fit the tiny gap that may exist between the stopper rod and the elastic layer, thus avoiding the gap problem caused by residual iron filings. This not only improves the service life and structural stability of the stopper rod and the quick-change device, but also effectively reduces the risk of molten steel and high-temperature gas spraying out of the gap, thereby greatly improving the safety and ease of use of the quick-change device.

[0037] Secondly, by providing a cavity inside the elastic layer and fixing a cooling bag filled with water therein, when the stopper rod quick replacement device replaces the stopper rod, the water in the cooling bag can effectively absorb the heat transmitted from the high-temperature molten steel in the upper water inlet to the elastic layer, reducing the thermal stress deformation of the elastic layer caused by high temperature, thereby greatly improving the service life and structural stability of the elastic layer and the sealing cover; in addition, the cavity is opened in the elastic layer to reduce the hardness of the elastic layer, reducing the force required for the operator to rotate the locking nut, making the entire replacement process more convenient and lighter, and improving work efficiency.

[0038] Thirdly, semicircular protrusions are arranged equidistantly on the surface of the elastic layer close to the stopper rod, and these protrusions together constitute a wavy contact surface. Correspondingly, grooves that perfectly fit the protrusions are opened on the surface of the stopper rod close to the elastic layer. This wavy design increases the contact area between the elastic layer and the upper wall of the stopper rod, so that these contact points can better disperse and withstand the thermal stress caused by high temperature. By dispersing the stress, the stress concentration per unit area of ​​the elastic layer is effectively reduced, thereby reducing the risk of deformation of the elastic layer caused by high temperature; in addition, the wavy contact surface can resist the deformation force caused by thermal expansion of the elastic layer to a certain extent, thereby further improving the structural stability of the entire sealing device; a balloon is built into each protrusion, and the water in the balloon is interconnected with the water in the cooling balloon. In a high temperature environment, the balloon can quickly absorb excess heat, thereby helping to reduce the local temperature of the elastic layer, which not only enhances the durability of the sealing device in a high temperature environment, but also significantly improves the stability of the sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic structural diagram of a stopper rod quick-change device for a continuous casting machine tundish proposed by the present invention;

[0040] Figure 2 A cross-sectional view of the displacement device proposed by the present invention;

[0041] Figure 3 A cross-sectional view of the elastic layer in the second embodiment of the present invention;

[0042] Figure 4 This is a cross-sectional view of the elastic layer in the third embodiment of the present invention.

[0043] In the figure: 100, displacement device; 110, screw rod; 120, through hole; 200, plug rod; 300, sealing device; 310, blocking cover; 320, sliding hole; 330, elastic layer; 340, locking nut; 350, cooling bag; 360, bump; 370, balloon; 400, fixing device; 410, connecting nut; 420, fastening nut; 430, pressing pad; 440, connecting rod; 500, stabilizing device; 510, extension rod; 520, towing rod; 530, friction block; 600, buoyancy positioning hook; 700, locking rod. DETAILED DESCRIPTION

[0044] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0045] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0047] Embodiment 1

[0048] like Figure 1 , Figure 2 As shown, a stopper rod quick-changing device for a continuous casting machine tundish proposed in the present application comprises a displacement device 100, a stopper rod 200, and a sealing device 300;

[0049] The displacement device 100 includes a screw rod 110;

[0050] The inner wall of the stopper rod 200 is provided with a threaded hole, the threaded hole of the stopper rod 200 is threadedly matched with the bottom end of the screw rod 110, the sealing device 300 is movably connected with the outer periphery of the screw rod 110, and the sealing device 300 is used to prevent the molten steel and high-temperature gas in the upper water inlet from being discharged from the upper outlet of the stopper rod 200;

[0051] The sealing device 300 includes a blocking cover 310, a sliding hole 320, an elastic layer 330, and a locking nut 340;

[0052] The blocking cover 310 is cylindrical, and a sliding hole 320 is coaxially formed in the blocking cover 310. The blocking cover 310 is sleeved on the outer periphery of the screw rod 110 through the sliding hole 320, and the screw rod 110 is slidably connected with the blocking cover 310;

[0053] The surface of the blocking cap 310 close to the stopper rod 200 is fixedly connected to the elastic layer 330, and the screw rod 110 coaxially penetrates the elastic layer 330;

[0054] The screw rod 110 is threadably matched with the locking nut 340 , and the locking nut 340 is located above the blocking cover 310 .

[0055] Furthermore, the elastic layer 330 is made of elastic metal.

[0056] Furthermore, the screw rod 110 is coaxially penetrated to form a through hole 120 , and the through hole 120 is communicated with the inner cavity of the stopper rod 200 .

[0057] Furthermore, the stopper rod quick-change device further includes a fixing device 400;

[0058] The fixing device 400 includes a connecting nut 410, a fastening nut 420, and a pressing pad 430;

[0059] The connecting nut 410 is threadedly matched with the screw rod 110, and the connecting nut 410 is located above the locking nut 340;

[0060] The fastening nut 420 is threadedly matched with the screw rod 110 , and the fastening nut 420 is located between the connecting nut 410 and the connecting nut 410 ;

[0061] The surface of the connecting nut 410 close to the fastening nut 420 is fixedly connected to the pressing pad 430 , and the surface of the fastening nut 420 close to the connecting nut 410 is also fixedly connected to the pressing pad 430 .

[0062] Furthermore, the fastening nut 420 is equidistantly fixedly connected to four cylindrical connecting rods 440 on its outer circumference.

[0063] Furthermore, the stopper rod quick-change device further includes a stabilizing device 500;

[0064] The stabilizing device 500 includes an extension rod 510, a towing rod 520, and a friction block 530;

[0065] The outer periphery of the connecting nut 410 is fixedly connected to the extension rod 510;

[0066] One end of the extension rod 510 away from the connection nut 410 is movably connected to the towing rod 520;

[0067] The outer periphery of the towing rod 520 is fixedly connected to a friction block 530 having a hexagonal cross-section.

[0068] Furthermore, the stopper rod quick-change device further includes a buoyancy positioning hook 600;

[0069] The buoyancy positioning hook 600 cooperates with the towing rod 520 so that when the stopper rod 200 is impacted by the molten steel in the upper water inlet, the stopper rod 200 and the quick-change device will not float.

[0070] Furthermore, the stopper rod quick-change device further includes a locking rod 700;

[0071] The locking rod 700 is L-shaped, and the locking rod 700 hooks one of the connecting rods 440 and drives the connecting rod 440 to rotate, so that the connecting nut 410 and the pressing pad 430 move downward, so that the connecting arm is locked by the connecting nut 410 and the fastening nut 420.

[0072] Specific implementation: First, the sliding hole of the blocking cover 310 is sleeved on the screw rod 110 to ensure that the screw rod 110 can slide smoothly therein, and then the heated plug rod 200 is precisely threadedly matched with the threaded hole at the bottom end of the screw rod 110 to ensure that the two are tightly connected, and then, by rotating the locking nut 340 on the screw rod 110 and using the downward pressure of the locking nut 340, the blocking cover 310 and the elastic layer 330 are tightly attached to the upper wall of the plug rod 200 to form an effective seal;

[0073] After completing the above steps, place the stopper rod 200 at the upper water inlet of the continuous casting machine. In order to ensure that the quick-change device and the stopper rod 200 remain stable under the impact of molten steel, buckle the buoyancy positioning hook 600 on the towing rod 520. The fixing effect of the buoyancy positioning hook 600 prevents the quick-change device and the stopper rod 200 from floating. Next, bring the screw rod 110 close to the connecting arm, and use the locking rod 700 to hook one of the connecting rods 440. By turning the locking rod 700, the connecting nut 410 rotates on the screw rod 110 and approaches the fastening nut 420. As the connecting nut 410 approaches, it and the fastening nut 420 jointly apply a clamping force to the connecting arm to ensure a stable connection between the connecting arm and the screw rod 110.

[0074] When the plug rod 200 is successfully replaced and fixed, if the quick-change device needs to be removed, it is only necessary to rotate the locking rod 700 in the opposite direction to release the clamping force of the connecting nut 410 and the connecting arm, and rotate the drag rod 520 by rotating the friction block 530, and finally easily remove the drag rod 520 from the extension rod 510, thereby completing the disassembly process of the entire quick-change device.

[0075] Beneficial effect: By fixing an elastic layer 330 made of elastic metal on the contact surface of the sealing cover 310 and the stopper rod 200, the iron filings and hard impurities that may remain on the upper wall of the stopper rod 200 are prevented from directly damaging the sealing cover 310 and the stopper rod 200. At the same time, since the elastic layer 330 has excellent deformation characteristics, it can deform to fit the tiny gap that may exist between the stopper rod 200 and the elastic layer 330, avoiding the gap problem caused by residual iron filings, which not only improves the service life and structural stability of the stopper rod 200 and the quick-change device, but also effectively reduces the risk of molten steel and high-temperature gas spraying out of the gap, thereby greatly improving the safety and ease of use of the quick-change device.

[0076] Embodiment 2

[0077] During the process of replacing the stopper rod 200 by the stopper rod quick replacement device, when the stopper rod 200 is inserted into the high-temperature molten steel in the upper water inlet, the elastic layer 330 at the bottom of the sealing cover 310 not only has to withstand the downward squeezing force of the locking nut 340, but also has to withstand the thermal stress deformation caused by the high temperature transmitted upward from the stopper rod 200, which reduces the service life and structural stability of the elastic layer 330. Therefore, embodiment 2 makes further improvements on embodiment 1.

[0078] like Figure 3 As shown, the sealing device 300 further includes a cooling bag 350;

[0079] An annular cavity is provided in the elastic layer 330 , and an annular cooling bag 350 is fixedly connected in the cavity. The cooling bag 350 is filled with water.

[0080] By providing a cavity inside the elastic layer 330 and fixing a cooling bag 350 filled with water therein, when the stopper rod quick replacement device replaces the stopper rod 200, the water in the cooling bag 350 can effectively absorb the heat transmitted from the high-temperature molten steel in the upper water inlet to the elastic layer 330, reducing the thermal stress deformation of the elastic layer 330 caused by the high temperature, thereby greatly improving the service life and structural stability of the elastic layer 330 and the sealing cover 310; in addition, the cavity is provided in the elastic layer 330, so that the hardness of the elastic layer 330 is reduced, and the force required for the operator to rotate the locking nut 340 is reduced, making the entire replacement process more convenient and light, and improving work efficiency.

[0081] Embodiment 3

[0082] In order to further improve the structural stability of the sealing device 300 in a high-temperature working environment, the third embodiment further improves the second embodiment.

[0083] like Figure 4 As shown, the sealing device 300 further includes a protrusion 360 and a balloon 370;

[0084] The elastic layer 330 is in an annular shape. The surface of the elastic layer 330 close to the stopper rod 200 is fixedly connected with a plurality of semicircular protrusions 360 at equal intervals. The plurality of protrusions 360 form a wavy surface. The surface of the stopper rod 200 close to the elastic layer 330 is provided with grooves that fit with the plurality of protrusions 360.

[0085] A balloon 370 is disposed in each of the protrusions 360 , and a plurality of the balloons 370 are filled with water. The plurality of the balloons 370 are connected to the cooling bag 350 .

[0086] Semicircular protrusions 360 are arranged equidistantly on the surface of the elastic layer 330 close to the stopper rod 200. These protrusions 360 together constitute a wavy contact surface. Accordingly, grooves that perfectly fit with the protrusions 360 are provided on the surface of the stopper rod 200 close to the elastic layer 330. This wavy design increases the contact area between the elastic layer 330 and the upper wall of the stopper rod 200, so that these contact points can better disperse and withstand the thermal stress generated by high temperature. By dispersing the stress, the stress concentration per unit area of ​​the elastic layer 330 is effectively reduced, thereby reducing the deformation of the elastic layer 330 caused by high temperature. deformation risk; in addition, the wavy contact surface can resist the deformation force caused by thermal expansion of the elastic layer 330 to a certain extent, thereby further improving the structural stability of the entire sealing device 300; a balloon 370 is built into each protrusion 360, and the water in the balloon 370 is interconnected with the water in the cooling bag 350. In a high temperature environment, the balloon 370 can quickly absorb excess heat, thereby helping to reduce the local temperature of the elastic layer 330, which not only enhances the durability of the sealing device 300 in a high temperature environment, but also significantly improves the stability of the sealing device 300.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. 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 stopper rod quick-change device for a continuous casting machine tundish, comprising a displacement device (100), a stopper rod (200), and a sealing device (300); the displacement device (100) comprises a screw rod (110); The inner wall of the stopper rod (200) is provided with a threaded hole, the threaded hole of the stopper rod (200) is threadedly matched with the bottom end of the screw rod (110), the sealing device (300) is movably connected to the outer periphery of the screw rod (110), and the sealing device (300) is used to prevent the molten steel and high-temperature gas in the upper water inlet from being discharged from the upper outlet of the stopper rod (200); It is characterized in that The sealing device (300) comprises a sealing cover (310), a sliding hole (320), an elastic layer (330), and a locking nut (340); The blocking cover (310) is cylindrical in shape, and a sliding hole (320) is coaxially provided on the blocking cover (310). The blocking cover (310) is sleeved on the outer periphery of the screw rod (110) through the sliding hole (320), and the screw rod (110) is slidably connected to the blocking cover (310); the surface of the blocking cover (310) close to the stopper rod (200) is fixedly connected to the elastic layer (330), and the screw rod (110) coaxially penetrates the elastic layer (330); The screw rod (110) is threadably matched with the locking nut (340), and the locking nut (340) is located above the blocking cover (310).

2. A stopper rod quick-change device for a continuous casting machine tundish as claimed in claim 1, characterized in that: The elastic layer (330) is made of elastic metal.

3. A stopper rod quick-change device for a continuous casting machine tundish as claimed in claim 1, characterized in that: The sealing device (300) further includes a cooling bag (350); An annular cavity is provided in the elastic layer (330), an annular cooling bag (350) is fixedly connected in the cavity, and the cooling bag (350) is filled with water.

4. A stopper rod quick-change device for a continuous casting machine tundish as claimed in claim 3, characterized in that: The sealing device (300) further includes a protrusion (360) and a balloon (370); The elastic layer (330) is in an annular shape as a whole. A surface of the elastic layer (330) close to the stopper rod (200) is equidistantly fixedly connected with a plurality of semicircular protrusions (360), the plurality of protrusions (360) forming a wavy surface. A surface of the stopper rod (200) close to the elastic layer (330) is provided with grooves that fit with the plurality of protrusions (360). A balloon (370) is provided in each of the protrusions (360), a plurality of the balloons (370) are filled with water, and a plurality of the balloons (370) are connected to the cooling bag (350).

5. The stopper rod quick-change device for the tundish of a continuous casting machine according to claim 1, characterized in that: The screw rod (110) coaxially penetrates to form a through hole (120), and the through hole (120) is communicated with the inner cavity of the stopper rod (200).

6. A stopper rod quick-change device for a continuous casting machine tundish as claimed in claim 1, characterized in that: The stopper rod quick-change device also includes a fixing device (400); The fixing device (400) comprises a connecting nut (410), a fastening nut (420), and a pressing pad (430); The connecting nut (410) is threadably matched with the screw rod (110), and the connecting nut (410) is located above the locking nut (340); The fastening nut (420) is threadably matched with the screw rod (110), and the fastening nut (420) is located between the connecting nut (410) and the connecting nut (410); The surface of the connecting nut (410) close to the fastening nut (420) is fixedly connected to the compression pad (430), and the surface of the fastening nut (420) close to the connecting nut (410) is also fixedly connected to the compression pad (430).

7. A stopper rod quick-change device for a continuous casting machine tundish as claimed in claim 6, characterized in that: The outer circumference of the fastening nut (420) is fixedly connected to four cylindrical connecting rods (440) at equal intervals.

8. A stopper rod quick-change device for a continuous casting machine tundish as claimed in claim 6, characterized in that: The stopper rod quick-change device further comprises a stabilizing device (500); The stabilizing device (500) comprises an extension rod (510), a towing rod (520), and a friction block (530); The outer periphery of the connecting nut (410) is fixedly connected to the extension rod (510); One end of the extension rod (510) away from the connection nut (410) is movably connected to the towing rod (520); The outer periphery of the drag rod (520) is fixedly connected to a friction block (530) having a hexagonal cross-section.

9. A stopper rod quick-change device for a continuous casting machine tundish as claimed in claim 8, characterized in that: The stopper rod quick-change device also includes a buoyancy positioning hook (600); The buoyancy positioning hook (600) cooperates with the towing rod (520) so that when the stopper rod (200) is impacted by the molten steel in the upper water inlet, the stopper rod (200) and the quick-change device will not float.

10. A stopper rod quick-change device for a continuous casting machine tundish as claimed in claim 7, characterized in that: The stopper rod quick-change device also includes a locking rod (700); The locking rod (700) is L-shaped. The locking rod (700) hooks one of the connecting rods (440) and drives the connecting rod (440) to rotate, thereby moving the connecting nut (410) and the pressing pad (430) downward, so that the connecting arm is locked by the connecting nut (410) and the fastening nut (420).

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