A stopless stopper changing device and method in continuous casting pouring process

Abstract

A kind of stopper replacement device and replacement method in continuous casting pouring process without stopping pouring, by setting blocking device and guiding device at quick-change mechanism, the molten steel passage of upper nozzle and its periphery are closed by blocking device when stopper is replaced, and the solidified molten steel in upper nozzle is oxidized and dredged by guiding device in the mode of oxygen pipe, finally the submerged nozzle is again loaded back to crystallizer through quick-change mechanism, and enters normal flow control pouring process.The present application can be widely applied to various continuous casting machine injection flow systems with quick-change mechanism, the device part is simple and effective, and can be reused multiple times;The present application can replace stopper without stopping pouring, improve the number of continuous casting furnace of tundish, and reduce production cost at the same time;The present application can quickly solve the problem that stopper cannot be replaced when abnormality occurs, reduce slab quality problems, and the resulting breakout accident.

Description

Technical Field

[0001] This invention relates to the field of continuous casting in iron and steel metallurgical production, and more particularly to a device and method for changing stoppers during continuous casting without stopping the casting process. Background Technology

[0002] Currently, in the continuous casting process of iron and steel metallurgical production in my country, one step involves molten steel entering the tundish from the ladle, and then entering the crystallizer through the injection channel via a stopper rod or slide plate control system installed on the tundish, where it is continuously cooled to form a continuously cast slab.

[0003] However, during the actual casting process, workers have discovered that the alumina in the molten steel continuously accumulates at the stopper head, causing channel blockage, reducing the flow diameter, and failing to meet the steel throughput requirements. Moreover, the accumulation of alumina in the injection channel alters the direction of the steel flow, causing flow deviation within the crystallizer, leading to slab quality problems, and in severe cases, even steel leakage accidents. In addition, the stopper head may also experience melting damage during normal production, causing it to fail to meet flow control requirements, resulting in larger fluctuations in liquid level, causing quality problems, or, in severe cases, steel overflow production accidents.

[0004] With current technology, the problem of abnormal stopper rods during the casting process is generally solved by replacing the tundish or replacing the stopper rod after stopping the casting process. However, this method causes production interruption, which has a huge impact on the steel throughput and disrupts the production plan, resulting in insufficient capacity.

[0005] Current technology also includes techniques for changing stopper rods during casting. For example, application number CN101786158A describes a quick-change device for stopper rods in the tundish of a continuous casting machine. This device consists of a base, a slewing mechanism, a lifting mechanism, clamps, and a stopper rod clamping mechanism. The slewing mechanism comprises a boom swing cylinder, a boom, a forearm swing cylinder, and a forearm. The lifting mechanism consists of a moving frame, transverse guide wheels, longitudinal guide wheels, and a lifting cylinder. The stopper rod clamping mechanism consists of a stopper rod, a connector, and a stopper rod seat. The stopper rod seat is equipped with a locking arm, and the connector is locked to the stopper rod seat via the locking arm. When the locking is released, the clamps grip the connector that holds the stopper rod, quickly moving it up and down or horizontally to replace the old stopper rod.

[0006] However, after on-site workers applied the device, they found that it was complex and required modifications to the tundish and related auxiliary mechanisms. In reality, there was no extra space on the production site to install it. In addition, the device had high operational requirements, requiring additional skilled operators, and the cost of the additional equipment / spare parts was high, which was not conducive to its implementation on the existing continuous casting production line. Summary of the Invention

[0007] In summary, to address the problem of alumina accumulation and melting at the stopper head during continuous casting, where existing solutions are overly complex, difficult to operate, and costly, this invention provides a stopper replacement device and method that allows for continuous casting without interrupting the process. Specifically, the problematic stopper is removed and a new stopper is installed without stopping casting. Furthermore, this invention does not require modification of the tundish or related auxiliary mechanisms, and it can increase the number of consecutive castings in the tundish and improve flow control accuracy, ensuring the continuity of the continuous casting production line.

[0008] The present invention provides a stopper rod replacement device and method for continuous casting without interruption of casting, the specific structure and method steps of which are as follows:

[0009] A stopper rod replacement device for continuous casting, comprising a quick-change mechanism and a stopper rod disposed below the upper water inlet of the tundish, characterized in that:

[0010] The quick-change mechanism is equipped with a blocking device and a guiding device;

[0011] The blocking device includes a blocking panel, a blocking panel housing, a blocking post, and a blocking post fixing housing. The blocking panel is a planar plate structure with a blocking surface housing around its perimeter, which wraps and fixes the blocking panel. A vertical blocking post is located at the center of the lower part of the blocking panel, and the blocking post fixing housing is sleeved around the outside of the blocking post.

[0012] The guiding device includes a sprue contact panel, a sprue contact panel housing, a guide hole, a guide tube, and a guide tube fixing housing. The sprue contact panel is a planar plate structure with a sprue contact panel housing surrounding it. The housing covers and fixes the sprue contact panel. A vertical guide hole is opened at the center of the sprue contact panel. The guide hole communicates with a guide tube that is vertically set at the center of the lower part of the blocking panel. That is, the guide hole passes through the center of the sprue contact panel and the guide tube, forming a channel. The guide tube fixing housing is sleeved on the guide tube in a wrapping manner.

[0013] Both the blocking panel and the water inlet contact panel can make close contact with the molten steel outlet at the lower part of the upper water inlet and seal the surrounding area of ​​that position;

[0014] The blocking panel, the water inlet contact panel, and the contact surface of the lower part of the water inlet are all on the same plane, which can make close contact with the molten steel outlet at the lower part of the water inlet, preventing the cleared blockage from entering the contact surface and causing jamming that would prevent the device from being removed.

[0015] The diameter of the channel formed by the guide hole is 2-3 mm larger than the inner diameter of the water inlet.

[0016] The difference between the inlet contact panel and the blocking panel is that the inlet contact panel has a guide hole, and the diameter of the guide hole is 2-3mm larger than the inner diameter of the inlet. This facilitates the removal of blockages after the oxygen pipe rotates along the inner wall of the guide device, and can clean the blockages on the inner wall of the inlet.

[0017] According to the present invention, a stopper rod replacement device for continuous casting is characterized in that the stopper panel of the stopper device is made of a non-baking refractory material, the outer shell of the stopper panel is made of metal with a thickness of 2-3 mm, the stopper rod is made of refractory material filling, and the stopper rod fixing shell is a steel plate with a thickness of 2-3 mm.

[0018] According to the present invention, a stopper rod replacement device for continuous casting is characterized in that the sprue contact panel and the guide tube of the guide device are both made of non-baking refractory material, the outer shell of the sprue contact panel is made of metal with a thickness of 2-3 mm, and the fixed shell of the guide tube is made of steel plate with a thickness of 2-3 mm.

[0019] The blocking panel, water inlet contact panel, and guide tube are all made of non-baking refractory material, which allows them to be used at any time without preheating. The blocking column fixing shell and the guide tube fixing shell are both made of steel plate with a thickness of 2-3mm to prevent the non-baking refractory material from cracking and to ensure that the entire device can be reused multiple times.

[0020] A method for replacing a stopper rod during continuous casting without interrupting the casting process, based on the aforementioned stopper rod replacement device for continuous casting without interrupting the casting process, comprises the following specific steps:

[0021] 1) During normal casting, the stopper rod injection control mechanism is in the open state, and there is a gap between the stopper rod and the upper water inlet. Molten steel enters the upper water inlet through this gap and then enters the crystallizer through the submerged entry point below.

[0022] 2) During the continuous casting process, if the stopper rod needs to be replaced due to melting, the stopper rod head being covered by alumina and unable to meet the flow control requirements, or other reasons, the new stopper rod to be replaced should be preheated to 800-1200℃ in advance, and the molten steel level in the tundish should be lowered to reduce buoyancy and facilitate the installation of the stopper rod.

[0023] 3) Reduce the billet speed to 0 m / min, keep the molten steel level in the crystallizer at about 80-120 mm from the crystallizer inlet, then place the blocking device in the replacement position of the quick-change mechanism below the upper water inlet, then close the stopper rod injection control mechanism in step 1), so that the old stopper rod is in complete contact with the upper channel opening of the molten steel channel of the upper water inlet, blocking and closing the molten steel channel. Finally, according to the quick-change operation method, push the blocking device to the pouring position, replace and remove the submerged water inlet in the pouring position. At this time, the blocking device is located in the pouring position and closes the lower channel opening of the molten steel channel of the upper water inlet and its surrounding area.

[0024] 4) Separate the connecting rod of the old stopper rod from the stopper rod injection control mechanism, lift out the old stopper rod, and immediately insert and install the preheated new stopper rod on the stopper rod injection control mechanism. At this time, the stopper rod injection control mechanism is still in the closed state. This step should ensure that the new stopper rod is well sealed to the upper channel opening of the molten steel channel of the water inlet.

[0025] 5) Install the guide device onto the quick-change mechanism, and then push the guide device to the pouring position in the quick-change operation mode for the second time. Replace and remove the blocking device in the pouring position. This step should ensure that the guide hole of the guide device is completely aligned with the channel opening at the bottom of the molten steel channel of the upper water inlet.

[0026] 6) Insert a metal pipe bent at 90 degrees as an oxygen pipe into the channel between the guide hole and the water inlet from the lower opening of the guide pipe of the guide device, and introduce oxygen to oxidize and clear the solidified molten steel in the water inlet.

[0027] 7) After the oxygen pipe is removed after step 6), start the billet pulling again to lower the molten steel level in the crystallizer to a position 460-500 mm away from the crystallizer inlet, ensuring that it does not touch the submerged entry nozzle to be loaded, and then stop the billet pulling.

[0028] 8) Install the submersible sprue to be installed onto the quick-change mechanism, and then push the submersible sprue into the pouring position for the third time according to the quick-change sprue operation method, and replace and remove the guide device;

[0029] 9) Return to the state of step 1) and open the stopper rod injection control mechanism to create a gap between the newly inserted stopper rod and the upper channel opening of the molten steel channel of the upper water inlet. At this time, the molten steel enters the crystallizer through the gap via the upper water inlet and the submerged water inlet. When the molten steel level in the crystallizer rises to a position 120-140mm away from the crystallizer inlet, start the billet pulling process again.

[0030] 10) Remove the oxides left on the surface of the molten steel in the crystallizer. At this point, the stopper rod replacement operation is completed, and the normal flow control casting process begins.

[0031] According to a method for replacing a stopper rod during continuous casting according to the present invention, the method is characterized in that, in step 4), during the period between the removal of the old stopper rod and the insertion of the new stopper rod, the blocking device continues to function, sealing the lower part of the molten steel channel of the upper water inlet and its surrounding area.

[0032] According to a method for replacing the stopper rod during continuous casting according to the present invention, the method is characterized in that, in step 6), the oxygen pipe is replaced multiple times until the channel is cleared.

[0033] The present invention provides a stopper rod replacement device and replacement method for continuous casting without interruption of casting. The overall concept is as follows:

[0034] In this invention, both the blocking device and the guiding device are installed at the quick-change mechanism below the upper nozzle. The blocking device is used to block the passage of molten steel during the replacement of the stopper rod, while the guiding device is used to position the oxygen pipe for subsequent cleaning after the stopper rod is replaced. The cleaned molten steel can flow downward along the guiding device without sticking to the quick-change mechanism of the nozzle, which would cause the mechanism to fail. After cleaning the solidified molten steel, the submersible nozzle is replaced, and the newly replaced stopper rod can be opened.

[0035] Using the stopper rod replacement device and replacement method for continuous casting during the present invention, the following results were obtained:

[0036] Beneficial effects:

[0037] 1. The stopper rod replacement device and replacement method of the present invention for continuous casting can be widely used in the flow injection system of various continuous casting machines with quick-change mechanisms. The device has a simple and effective structure and can be reused multiple times.

[0038] 2. The stopper rod replacement device and method of the present invention for continuous casting can replace the stopper rod without stopping casting, thereby increasing the number of continuous casting heats in the tundish while reducing production costs.

[0039] 3. The stopper rod replacement device and replacement method of the present invention for continuous casting can quickly and effectively solve the problem that the stopper rod could not be replaced when abnormality occurred, reduce slab quality problems, and prevent steel leakage accidents caused by them. Attached Figure Description

[0040] Figure 1 The diagram shows a structural comparison of the stopper rod replacement device and replacement method for continuous casting during the present invention in normal use (left figure) and in use with a blocking device (right figure).

[0041] Figure 2The diagram shows a structural comparison of the stopper rod replacement device and method for continuous casting during the present invention, in the state of replacing the old and new stopper rods (left figure) and in the state of using an oxygen pipe for oxidation and unblocking (right figure).

[0042] Figure 3 This is a schematic diagram of the structure of a stopper rod replacement device and replacement method for continuous casting, which involves reinstalling the submersible nozzle replacement guide device.

[0043] Figure 4 This is a schematic diagram of the blocking device for a stopper rod replacement device and replacement method that allows for continuous casting during the present invention.

[0044] Figure 5 This is a schematic diagram of the guiding device for a stopper rod replacement device and replacement method that allows for continuous casting during the present invention.

[0045] In the diagram: 1-Intermediate drum, 2-Inlet, 3-Quick change mechanism, 4-Stop rod, 5-Immersion nozzle, 6-Crystallizer, 7-Oxygen pipe, A-Blocking device, A1-Blocking panel, A2-Blocking panel housing, A3-Blocking column, A4-Blocking column fixing housing, B-Guiding device, B1-Inlet contact panel, B2-Inlet contact panel housing, B3-Guiding hole, B4-Guiding tube, B5-Guiding tube fixing housing. Detailed Implementation

[0046] The following description, in conjunction with the accompanying drawings and embodiments, further describes the technical means, creative features, objectives, and effects of the stopper rod replacement device and replacement method for continuous casting during the continuous casting process of the present invention.

[0047] like Figures 1-5 As shown, a stopper rod replacement device for continuous casting includes a quick-change mechanism 3 and a stopper rod 4 located below the upper water inlet 2 at the lower part of the tundish 1.

[0048] The quick-change mechanism is equipped with a blocking device A and a guiding device B;

[0049] like Figure 4 As shown, the blocking device A includes a blocking panel A1, a blocking panel housing A2, a blocking post A3, and a blocking post fixing housing A4. The blocking panel is a planar plate structure with a blocking surface housing around its perimeter, which wraps and fixes the blocking panel. A vertical blocking post is located at the center of the lower part of the blocking panel, and the blocking post fixing housing is sleeved around the outside of the blocking post.

[0050] like Figure 5As shown, the guide device B includes a sprue contact panel B1, a sprue contact panel housing B2, a guide hole B3, a guide tube B4, and a guide tube fixing housing B5. The sprue contact panel is a flat plate structure with a sprue contact panel housing around its perimeter. The housing covers and fixes the sprue contact panel. A vertical guide hole is opened at the center of the sprue contact panel. The guide hole communicates with the guide tube, which is vertically set at the center of the lower part of the blocking panel. That is, the guide hole passes through the center of the sprue contact panel and the guide tube, forming a channel. The guide tube fixing housing is sleeved on the guide tube in a wrapping manner.

[0051] Both the blocking panel A1 and the nozzle contact panel B1 can make close contact with the molten steel outlet at the lower part of the upper nozzle 2 and seal the surrounding area of ​​that position;

[0052] The diameter of the channel formed by the guide hole B3 is 2-3 mm larger than the inner diameter of the water inlet 2.

[0053] The blocking panel A1 of the blocking device A is made of non-baking refractory material, the outer shell A2 of the blocking panel is made of metal with a thickness of 2-3mm, the blocking column A3 is made of refractory material filling, and the blocking column fixing shell A4 is a steel plate with a thickness of 2-3mm.

[0054] The water inlet contact panel B1 and the guide tube B4 of the guide device B are both made of non-baking refractory material, the outer shell B2 of the water inlet contact panel is made of metal with a thickness of 2-3mm, and the fixed shell B5 of the guide tube is made of steel plate with a thickness of 2-3mm.

[0055] A method for replacing a stopper rod during continuous casting without interrupting the casting process, based on the aforementioned stopper rod replacement device for continuous casting without interrupting the casting process, comprises the following specific steps:

[0056] 1) such as Figure 1 As shown, during normal casting, the stopper rod injection control mechanism is in the open state, and there is a gap between the stopper rod 4 and the upper water inlet 2. Molten steel enters the upper water inlet through this gap and enters the crystallizer 6 through the submerged water inlet 5 below.

[0057] 2) During the continuous casting process, if the stopper rod needs to be replaced due to melting, the stopper rod head being covered by alumina and unable to meet the flow control requirements, or other reasons, the new stopper rod to be replaced should be preheated to 800-1200℃ in advance, and the molten steel level in tundish 1 should be lowered to reduce buoyancy and facilitate the installation of the stopper rod.

[0058] 3) such as Figure 1As shown, reduce the billet speed to 0 m / min, keep the molten steel level in the crystallizer 6 at about 80-120 mm from the crystallizer inlet, then place the blocking device A in the replacement position of the quick-change mechanism 3 below the upper water inlet 2, then close the stopper rod injection control mechanism in step 1), so that the old stopper rod is in complete contact with the upper channel opening of the molten steel channel of the upper water inlet, blocking and closing the molten steel channel. Finally, according to the water inlet quick-change operation method, push the blocking device to the pouring position, and replace and remove the submerged water inlet 5 in the pouring position. At this time, the blocking device is located in the pouring position and closes the lower channel opening of the molten steel channel of the upper water inlet and its surrounding area.

[0059] 4) such as Figure 2 As shown, the connecting rod of the old stopper rod is separated from the stopper rod injection control mechanism. The old stopper rod is lifted out, and the new stopper rod, which has been preheated, is immediately inserted and installed on the stopper rod injection control mechanism. At this time, the stopper rod injection control mechanism is still in the closed state. This step should ensure that the new stopper rod is well sealed to the upper channel opening of the molten steel channel of the water inlet 2.

[0060] 5) such as Figure 2 As shown, install the guide device B onto the quick-change mechanism 3, and then push the guide device to the pouring position in the second quick-change operation mode. Replace and remove the blocking device A in the pouring position. This step should ensure that the guide hole B3 of the guide device is completely aligned with the lower channel opening of the molten steel channel of the upper water inlet 2.

[0061] 6) such as Figure 2 As shown, a metal pipe bent at 90 degrees is used as an oxygen pipe 7 and inserted from the lower opening of the guide pipe B4 of the guide device B into the channel between the guide hole B3 and the water inlet 2, and oxygen is introduced to oxidize and clear the solidified molten steel in the water inlet.

[0062] 7) After the oxygen pipe 7 is removed after step 6), start the billet pulling again to lower the molten steel level in the crystallizer 6 to a position 460-500 mm away from the crystallizer inlet, ensuring that it does not touch the submerged entry nozzle 5 to be installed, and then stop the billet pulling.

[0063] 8) For example Figure 3 As shown, the submersible sprue 5 to be installed is placed on the quick-change mechanism 3, and then the submersible sprue is pushed into the pouring position for the third time according to the sprue quick-change operation method, and the guide device B is replaced and removed.

[0064] 9) Return to the state of step 1), open the stopper rod injection control mechanism, so that a gap appears between the newly inserted stopper rod and the upper channel opening of the molten steel channel of the upper water inlet 2. At this time, the molten steel enters the crystallizer 6 through the gap, through the upper water inlet and the submerged water inlet 5. When the molten steel level in the crystallizer rises to a position 120-140mm away from the crystallizer inlet, start the billet pulling again.

[0065] 10) Remove the oxides left on the surface of the molten steel in the crystallizer 6. At this point, the stopper rod replacement operation is completed, and the normal flow control casting process begins.

[0066] In step 4), during the period between the removal of the old stopper and the insertion of the new stopper, the blocking device (A) continues to function, sealing the lower part of the molten steel channel of the upper water inlet (2) and its surrounding area.

[0067] In step 6), the oxygen supply tube 7 needs to be replaced multiple times until the passage is clear.

[0068] Example

[0069] In a steel plant's No. 4 continuous casting machine, severe blockage of the stopper rod head by alumina during casting prevented the steel flow rate from maintaining the minimum casting speed. Therefore, this invention employs a stopper rod replacement device and method that allows for continuous casting without interruption of the casting process, as detailed below:

[0070] The operator preheats the new stopper rod to above 800℃, lowers the molten steel level in the tundish 1 to below 500mm, reduces the billet speed to 0m / min, confirms that the molten steel level in the crystallizer 6 is maintained at about 100mm from the crystallizer inlet, closes the stopper rod mechanism so that the stopper rod 4 is in complete contact with the upper water inlet 2, and closes the steel flow channel.

[0071] Place the blocking device A in the replacement position of the quick-change mechanism 3, and then, for the first time, push the blocking device into the pouring position according to the quick-change operation method, and replace and remove the immersion-type sprue 5 in the pouring position.

[0072] Remove the old stopper rod from the stopper rod flow control mechanism and install the new stopper rod on the stopper rod flow control mechanism. At this time, the stopper rod flow control mechanism is still in the closed state, and ensure that the new stopper rod closes the water inlet 2 properly.

[0073] Install the guide device B onto the quick-change mechanism 3, and then push the guide device into the pouring position in the second quick-change operation mode. Replace and remove the blocking device A, and insert the pre-prepared oxygen pipe 7 into the channel between the guide hole B3 of the guide device and the upper water inlet 2 to introduce oxygen to oxidize and clear the solidified molten steel in the upper water inlet.

[0074] After the blockage is cleared, start the billet pulling process to lower the molten steel level in the crystallizer 6 to a position 450-500mm away from the crystallizer inlet, and then stop the billet pulling process.

[0075] Install the submersible sprue to be installed onto the quick-change mechanism 3, and then push the submersible sprue into the pouring position for the third time according to the sprue quick-change operation method, and replace and remove the guide device B.

[0076] Finally, the stopper rod injection control mechanism is opened, creating a gap between the stopper rod 4 and the upper water inlet 2. The molten steel flows through the gap into the crystallizer 6 via the upper water inlet and the submerged entry point. When the molten steel level rises to 120mm from the crystallizer inlet, the billet pulling is started at a speed of 0.3-0.4m / min. At the same time, the oxides left on the surface of the molten steel in the crystallizer are removed. At this point, the stopper rod replacement operation is completed, and the pouring speed gradually increases to the target speed.

[0077] The stopper rod replacement device and method for continuous casting without interruption of pouring, as described in this invention, can be widely applied to various continuous casting machine flow systems equipped with quick-change mechanisms. The device itself is simple and effective in construction and can be reused multiple times. This invention allows for stopper rod replacement without interruption of pouring, increasing the number of continuous heats that can be poured in the tundish while reducing production costs. Furthermore, this invention can quickly and effectively solve the problem of stopper rods being unable to be replaced when malfunctions occur, reducing slab quality issues and the resulting steel leakage accidents.

[0078] The stopper rod replacement device and method for continuous casting without interruption of casting, as described in this invention, are technically mature and reliable, and have versatility and practicality. They can be widely used in continuous casting operations that require stopper rod replacement. Implementing this invention will result in significant economic benefits and a broad market prospect.

[0079] It should be noted that in the description of this invention, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0080] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any variations or modifications to the above embodiments that fall within the spirit and essence of this application will fall within the scope of the claims of this application.

Claims

1. A stopper rod replacement device for continuous casting, comprising a quick-change mechanism (3) and a stopper rod (4) disposed below the upper water inlet (2) at the lower part of the tundish (1), characterized in that: The quick-change mechanism (3) is equipped with a blocking device (A) and a guiding device (B); The blocking device (A) includes a blocking panel (A1), a blocking panel housing (A2), a blocking post (A3), and a blocking post fixing housing (A4). The blocking panel is a planar plate structure with a blocking surface housing around its perimeter, which wraps and fixes the blocking panel. A vertical blocking post is provided at the center of the lower part of the blocking panel, and the blocking post fixing housing is sleeved around the outside of the blocking post. The guiding device (B) includes a water inlet contact panel (B1), a water inlet contact panel housing (B2), a guide hole (B3), a guide tube (B4), and a guide tube fixing housing (B5). The water inlet contact panel is a planar plate structure with a water inlet contact panel housing around its outer perimeter. The housing covers and fixes the water inlet contact panel. A vertical guide hole is opened at the center of the water inlet contact panel. The guide hole communicates with the guide tube, which is vertically set at the center of the lower part of the blocking panel. That is, the guide hole passes through the center of the water inlet contact panel and the guide tube to form a channel. The guide tube fixing housing is sleeved on the guide tube in a wrapping manner. Both the blocking panel (A1) and the water inlet contact panel (B1) can make close contact with the molten steel outlet at the lower part of the upper water inlet (2) and seal the surrounding area of ​​that position; The diameter of the channel formed by the guide hole (B3) is 2-3 mm larger than the inner diameter of the water inlet (2).

2. The stopper rod replacement device for continuous casting as described in claim 1, characterized in that, The blocking device (A) has a blocking panel (A1) made of non-baking refractory material, a blocking panel shell (A2) made of metal with a thickness of 2-3 mm, a blocking post (A3) made of refractory material, and a blocking post fixing shell (A4) made of steel plate with a thickness of 2-3 mm.

3. The stopper rod replacement device for continuous casting as described in claim 1, characterized in that, The water inlet contact panel (B1) and guide tube (B4) of the guide device (B) are both made of non-baking refractory material, the outer shell of the water inlet contact panel (B2) is made of metal with a thickness of 2-3mm, and the guide tube fixing shell (B5) is made of steel plate with a thickness of 2-3mm.

4. A method for replacing a stopper rod during continuous casting without interrupting the casting process, based on the stopper rod replacement device for continuous casting as described in any one of claims 1 to 3, the specific steps of which are as follows: 1) During normal casting, the stopper rod injection control mechanism is in the open state, and there is a gap between the stopper rod (4) and the upper water inlet (2). The molten steel enters the upper water inlet through this gap and enters the crystallizer (6) through the lower submerged water inlet (5). 2) During the continuous casting process, if the stopper rod is melted, the stopper rod head is covered by alumina and cannot meet the flow control requirements, or other situations require the stopper rod to be replaced, the new stopper rod to be replaced should be preheated to 800-1200℃ in advance, and the molten steel level in the tundish (1) should be lowered to reduce buoyancy and facilitate the installation of the stopper rod. 3) Reduce the billet speed to 0 m / min, keep the molten steel level in the crystallizer (6) at about 80-120 mm from the crystallizer inlet, then place the blocking device (A) at the replacement position of the quick-change mechanism (3) below the upper water inlet (2), then close the stopper flow control mechanism in step 1), so that the old stopper is in complete contact with the upper channel of the molten steel channel of the upper water inlet, blocking and closing the molten steel channel. Finally, according to the quick-change operation method of the water inlet, push the blocking device to the pouring position, replace and remove the submerged water inlet (5) in the pouring position. At this time, the blocking device is located in the pouring position and closes the lower channel of the molten steel channel of the upper water inlet and its surrounding area. 4) Separate the connecting rod of the old stopper rod from the stopper rod injection control mechanism, lift out the old stopper rod, and immediately insert and install the new stopper rod that has been preheated onto the stopper rod injection control mechanism. At this time, the stopper rod injection control mechanism is still in the closed state. This step should ensure that the new stopper rod is well sealed to the upper part of the steel liquid channel of the water inlet (2). 5) Install the guide device (B) onto the quick-change mechanism (3), and then push the guide device to the pouring position in the second quick-change operation mode, and replace the blocking device (A) in the pouring position. This step should ensure that the guide hole (B3) of the guide device is completely aligned with the channel opening at the bottom of the molten steel channel of the upper water inlet (2). 6) A metal pipe bent at 90 degrees is used as an oxygen pipe (7) and inserted into the channel between the guide hole (B3) and the water inlet (2) from the lower opening of the guide pipe (B4) of the guide device (B), and oxygen is introduced to oxidize and clear the solidified molten steel in the water inlet. 7) After the oxygen pipe (7) is removed after step 6) the billet is cleared, start the billet pulling again to lower the steel liquid level in the crystallizer (6) to a position 460-500mm away from the crystallizer inlet, ensuring that it does not touch the submerged entry nozzle (5) to be loaded, and then stop the billet pulling. 8) Install the submersible nozzle (5) to be installed onto the quick-change mechanism (3), and then push the submersible nozzle into the pouring position for the third time according to the quick-change operation method, and replace and remove the guide device (B); 9) Return to the state of step 1) and open the stopper rod injection control mechanism so that a gap appears between the newly inserted stopper rod and the upper part of the steel liquid channel of the upper water inlet (2). At this time, the molten steel enters the crystallizer (6) through the gap through the upper water inlet and the submerged water inlet (5). When the molten steel level in the crystallizer rises to a position 120-140mm away from the crystallizer inlet, start the billet pulling again. 10) Remove the oxides left on the surface of the molten steel in the crystallizer (6). At this time, the stopper rod replacement operation is completed and the normal flow control casting process begins.

5. The method for replacing the stopper rod during continuous casting as described in claim 4, characterized in that, In step 4), during the period between the removal of the old stopper and the insertion of the new stopper, the blocking device (A) continues to function, sealing the lower part of the molten steel channel of the upper water inlet (2) and its surrounding area.

6. The method for replacing the stopper rod during continuous casting as described in claim 4, characterized in that, In step 6), the oxygen supply tube (7) is replaced multiple times until the passage is clear.

Images