A high-strength slag-resistant embedded slag retaining wall

Abstract

This invention discloses a high-strength, slag-resistant embedded slag-blocking wall, comprising a tundish and a slag-blocking wall body. The slag-blocking wall body is inclinedly disposed in the middle of the tundish. A bottom groove is provided at the bottom of the tundish body, and side grooves symmetrically arranged on the front and rear side walls of the tundish to connect with the bottom groove for accommodating the slag-blocking wall body are provided. The slag-blocking wall body includes a hollow bottom beam abutting against the inside of the bottom groove, and a laterally extending sedimentation bottom plate is fixed to the top of the hollow bottom beam. The beneficial effects are: this invention reduces the dead zone problem caused by poor steel flow at the contact point between the bottom side of the slag-blocking wall and the tundish, promotes the flow of molten steel along the guide holes of the inclined impact-resistant back plate, thereby promoting the floating of slag inclusions and improving the cleanliness of the molten steel; the slag-blocking wall body utilizes its own weight to achieve a seal at the contact point between its outer edge and the tundish, eliminating the need for additional mortar coating for sealing, improving the convenience of replacing the slag-blocking wall inside the tundish and the sealing efficiency, and increasing production efficiency.

Description

Technical Field

[0001] This invention relates to the field of continuous casting equipment, and more specifically to a high-strength, slag-resistant embedded slag retaining wall. Background Technology

[0002] The tundish, serving as a transitional device between the ladle and the crystallizer in continuous casting, is not only a storage and distributor of molten steel but also a refining vessel. It stabilizes the steel flow, reduces the scouring of the billet shell in the crystallizer, and ensures a reasonable flow field and appropriate residence time for the molten steel. This guarantees uniform steel temperature, the separation and flotation of non-metallic impurities, and ensures steel cleanliness and continuous casting across multiple furnaces. It is a crucial element in improving steel quality and continuous casting efficiency. The slag retaining wall, as an important component of the tundish, is directly installed... The purpose of using slag baffles in tundishes is to promote the flotation of non-metallic inclusions and control steel slag within a specific area, thereby reducing the slag content in the molten steel. Specifically, this is achieved by setting up slag baffles to change the flow field of the molten steel, thereby appropriately extending the residence time of the molten steel in the tundish. This allows the inclusions sufficient time to collide, aggregate, and float, thus purifying the molten steel. However, currently, steel plants are implementing continuous casting in tundishes, and existing magnesia slag baffles will experience erosion after more than 10 hours of use, causing the slag baffles to lose their intended function. Therefore, it is necessary to install embedded slag retaining walls to replace masonry walls, thereby enabling the timely replacement of slag retaining walls. However, the existing slag retaining walls are vertical structures. After replacing them individually, mortar should be used to fill the gaps at the junction of the slag retaining wall and the tundish to ensure the airtightness of the junction. However, after filling the gaps with mortar, it is necessary to wait for the sealed area to dry and then use a ladle baking machine to ensure the airtightness of the tundish lining and the slag retaining wall. This results in low replacement efficiency of the slag retaining walls inside the tundish, inconvenience of use, and affects the continuous casting production efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a high-strength, slag-resistant embedded slag retaining wall to solve the aforementioned problems. This reduces the dead zone caused by poor steel flow at the contact point between the bottom of the slag retaining wall and the tundish, promotes the flow of molten steel along the guide holes of the inclined impact-resistant back plate, and thus promotes the floating of slag inclusions and improves the cleanliness of the molten steel. In addition, by placing the slag retaining wall at an incline, its own weight can be used to press it against the side groove and the downward-inclined side of the bottom, thereby achieving a seal at the contact point between the outer edge of the slag retaining wall and the tundish using its own weight. This eliminates the need for additional mortar coating for sealing, improves the convenience of replacing the slag retaining wall inside the tundish and the sealing efficiency, replaces traditional sealing methods, and improves production efficiency, as detailed below.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] The present invention provides a high-strength slag-resistant embedded slag retaining wall, comprising an intermediate ladle and a slag retaining wall body. The slag retaining wall body is inclinedly disposed in the middle of the intermediate ladle. A bottom groove is provided at the bottom of the intermediate ladle body. Side grooves for accommodating the slag retaining wall body are symmetrically disposed on the front and rear side walls of the intermediate ladle.

[0006] The slag-blocking wall includes a hollow bottom beam that is abutted against the inside of the bottom trough. A laterally extending sedimentation bottom plate is fixed to the top of the hollow bottom beam. Two sets of protective side wings are symmetrically fixed to the front and rear sides of the sedimentation bottom plate. The outer side of the protective side wings extends into the side trough and abuts against the downward-sloping side of the side trough. The two sets of protective side wings converge on the downward-sloping side and are connected to an impact-resistant back plate. A flow guide hole is provided in the middle of the impact-resistant back plate.

[0007] Using the aforementioned high-strength, slag-resistant embedded retaining wall, when installing the retaining wall into the tundish, a crane is used to connect the suspension lugs to lift the entire retaining wall into the tundish. This ensures that the hollow bottom beam can move down along the side groove and abut against the bottom groove, while the wedge-shaped protrusions on the outer side of the protective wing can abut against the lower side of the side groove's inclined direction. At this point, the bottom of the retaining wall abuts against the bottom edge, and the front and rear sides abut against the lower side of the side groove, thus achieving a rapid assembly process of the retaining wall in the tundish. Simultaneously with the installation of the retaining wall into the tundish, the hollow bottom beam drives the top rod at its inner bottom to move down into the receiving hole and abut against it downwards. The sealing cone is pressed down to the position where it is disengaged from the receiving hole, thus releasing the sealing effect of the sealing cone on the receiving hole. At the same time, the auxiliary rod moves down to the position where it extends into the auxiliary hole, thus closing the auxiliary hole. At this time, the isobaric gas distribution box can be connected to the tundish in sequence through the receiving hole, the air inlet, and the air blowing hole. It can also be connected to the external gas supply equipment through the heat exchange pipe to input the inert gas upward into the hollow bottom beam along the heat exchange pipe, the guide pipe, and the isobaric gas distribution box, and discharge it upward into the tundish along the air blowing hole. The inert gas is discharged through the air blowing hole to promote the agitation of the molten steel in the dead zone at the bottom side of the slag retaining wall, thereby promoting the floating of the slag inclusions in the molten steel.

[0008] Molten steel injected into the tundish from the ladle near the heat exchange tubes is blocked by the slag-blocking wall. The impact-resistant backplate also blocks the molten steel, ensuring that it can only flow to the other side of the tundish through the guide holes on the inclined impact-resistant backplate. This reduces the volume of the dead zone inside the tundish due to the slag-blocking wall, thereby reducing the problem of slag inclusions caused by the poor flowability of the dead zone.

[0009] Preferably, the impact-resistant backplate and the deposition base plate, together with two sets of protective side wings, form a closing mechanism with a gradually decreasing inner space. The hollow bottom beam is a hollow cylindrical structure with closed front and rear ends, and the top side of the deposition base plate is flush with the top side of the hollow bottom beam.

[0010] Preferably, the diversion holes are inclined downward at one end close to the deposition bottom plate. There are three groups of diversion holes, which are distributed in a "pin" shape. The bottom side of the bottom groove is an arc that fits the outer circumferential side of the hollow bottom beam.

[0011] Preferably, a wedge-shaped convex block is fixed on the outer side of the protective flank, which longitudinally extends into the side groove and abuts against the inner side of the side groove. A molten steel filter is arranged inside the diversion hole. The molten steel filter is a cylinder that is press-fitted into the diversion hole, and the molten steel filter is a honeycomb structure made of silicon carbide.

[0012] Preferably, a circular hanging lug is fixed on the top side of the protective flank. The protective flank, the hollow bottom beam, the impact-resistant back plate and the deposition bottom plate are prefabricated parts integrally formed by magnesia-based basic castable. A zirconia brick layer is arranged on one side of the impact-resistant back plate close to the hollow bottom beam.

[0013] Preferably, multiple groups of air blowing holes are longitudinally and evenly arranged on the top of the hollow bottom beam. An air inlet hole vertically penetrates through the bottom of the hollow bottom beam between adjacent air blowing holes. Multiple groups of ejector rods corresponding to the distribution of the air inlet holes are fixed on the inner top of the hollow bottom beam and vertically penetrate through the air inlet hole, and the diameter of the ejector rod is smaller than the diameter of the air inlet hole.

[0014] Preferably, multiple groups of accommodation holes corresponding to the distribution of the air inlet holes are longitudinally and evenly arranged in the bottom groove at the inner bottom of the tundish. The accommodation holes are tapered hole structures with the top ends communicating with the air inlet holes. The bottom ends of the ejector rods vertically penetrate into the accommodation holes. Three equal-pressure air distribution boxes are arranged on the bottom side of the tundish corresponding to the accommodation holes. The bottoms of the three equal-pressure air distribution boxes are connected with a constraint mechanism.

[0015] Preferably, a sealing hole vertically penetrates through the center of the bottom of the equal-pressure air distribution box. Two groups of auxiliary holes are symmetrically arranged horizontally on the bottom of the equal-pressure air distribution box on both sides of the sealing hole. The constraint mechanism includes three pressure rods corresponding to the distribution of the equal-pressure air distribution boxes. The pressure rods vertically penetrate through the bottom of the equal-pressure air distribution box. A sealing ring is arranged at the joint of the bottom of the equal-pressure air distribution box and the pressure rod. The sealing ring is a high-temperature resistant rubber, and the pressure rod is vertically slidably sealed with the equal-pressure air distribution box through the sealing ring.

[0016] Preferably, a sealing cone plate extending into the accommodation hole is fixed at the top end of the pressure rod. The sealing cone plate is a frustum structure that can abut against the inner side of the accommodation hole to seal the sealing hole. A spring for pushing the sealing cone plate upward to keep it tightly abutted is sleeved on the outer side of the pressure rod inside the equal-pressure air distribution box. Two groups of auxiliary rods vertically penetrating into the auxiliary holes are fixed on both sides of the sealing cone plate. The length of the auxiliary rods is smaller than the inner height of the equal-pressure air distribution box.

[0017] Preferably, multiple isobaric gas distribution boxes are all laterally connected to the outside of branch pipes, and multiple branch pipes are all connected to a gas supply assembly. The gas supply assembly includes a heat exchange pipe arranged in a serpentine manner on the outer wall of the intermediate drum. The bottom end of the heat exchange pipe is connected to a guide pipe extending to the bottom side of the intermediate drum. Three sets of sealing joints connecting the branch pipes are provided on the outside of the guide pipe. The four corners of the bottom of the intermediate drum are all vertically fixed with overhead steel legs that support the intermediate drum in an off-ground state.

[0018] The beneficial effects are as follows: This invention sets up an inclined side groove and an arc-shaped bottom groove inside the tundish, and sets up an inclined slag-blocking wall. The protective side wings are embedded in the side groove, and the bottom side of the hollow bottom beam is pressed against the inner arc surface of the bottom groove. This ensures that the slag-blocking wall can be placed inclined inside the tundish, providing inclined buffering for the molten steel. This reduces the dead zone problem caused by poor molten steel flow at the contact point between the bottom side of the slag-blocking wall and the tundish, promotes the flow of molten steel along the guide holes of the inclined impact-resistant back plate, and promotes the floating of slag inclusions, thereby improving the cleanliness of the molten steel.

[0019] In addition, by tilting the slag retaining wall, its own weight can be used to press it against the side groove and the bottom side tilted downwards. This allows the slag retaining wall to achieve a seal between its outer edge and the contact point with the tundish, eliminating the need for additional mortar coating. This improves the ease of replacing the slag retaining wall in the tundish and the sealing efficiency, replacing traditional sealing methods and increasing production efficiency.

[0020] In addition, the slag retaining wall can be connected to the isobaric gas distribution box through a lifting and moving sealing cone. When the slag retaining wall is assembled into the tundish, the sealing cone can be pushed down by the top rod extending downward into the receiving hole inside the hollow bottom beam. Thus, after the slag retaining wall is assembled, the gas outlet channel is automatically connected. Inert gas can be discharged upward through the gas outlet channel to promote the tumbling of molten steel and achieve the slag floating action.

[0021] Furthermore, when the slag retaining wall is lifted upwards for replacement, the sealing cone plate is pushed by a spring to press against the receiving hole again, thereby automatically closing the air outlet channel. At the same time, the sealing cone plate drives the auxiliary rod to move upwards, thereby disengaging from the auxiliary hole and changing the closed state of the auxiliary hole to the open state. At this time, air can continue to be introduced into the isobaric gas distribution box to promote the downward discharge of molten steel and slag and other impurities falling into the isobaric gas distribution box, without the need for manual cleaning. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a front view structural diagram of the present invention;

[0024] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0025] Figure 3 This is a structural breakdown diagram of the present invention;

[0026] Figure 4 This is a three-dimensional structural diagram of the slag-retaining wall of the present invention;

[0027] Figure 5 This is a partial structural breakdown diagram of the present invention;

[0028] Figure 6 This is a three-dimensional structural schematic diagram of the constraint mechanism of the present invention;

[0029] Figure 7 This is a front sectional view of the present invention;

[0030] Figure 8 This is a three-dimensional structural schematic diagram of another aspect of the present invention;

[0031] Figure 9 This is a structural breakdown diagram of another aspect of the present invention;

[0032] Figure 10 This is a top view of the structure of the present invention.

[0033] The annotations in the attached figures are explained as follows:

[0034] 1. Intermediate tank; 101. Bottom trough; 102. Side trough; 103. Reception hole; 104. Overhead steel leg; 105. Mounting hole; 2. Slag retaining wall; 201. Hollow bottom beam; 202. Sedimentation bottom plate; 203. Protective side wing; 203a. Wedge-shaped protrusion; 204. Guide hole; 205. Impact-resistant back plate; 206. Air blowing hole; 207. Suspension lug; 208. Top rod; 209. Air inlet; 3. Isobaric gas distribution box; 301. Sealing hole; 302. Auxiliary hole; 4. Branch pipe; 5. Gas supply assembly; 501. Heat exchange tube; 502. Guide pipe; 503. Pipe joint; 6. Plug rod; 7. Ventilation plug; 8. Constraint mechanism; 801. Synchronization frame; 802. Pressure rod; 803. Sealing cone; 804. Holding spring; 805. Auxiliary rod. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0036] See Figures 1-10 As shown, the present invention provides a high-strength slag-resistant embedded slag retaining wall, including a tundish 1 and a slag retaining wall 2. The slag retaining wall 2 is inclined in the middle of the tundish 1, and the top of the slag retaining wall 2 is inclined away from the side where molten steel is poured from the ladle. After the ladle pours molten steel into the tundish 1, the side of the slag retaining wall 2 that impacts the molten steel is set as a slope structure with the top inclined upward, thereby reducing the dead zone space where the molten steel has poor fluidity at the bottom of the slag retaining wall 2 and the tundish 1, and improving the fluidity of the molten steel. The bottom of the tundish 1 body is provided with a bottom groove 101 to accommodate the embedded installation of the slag retaining wall 2. The front and rear side walls of the tundish 1 are symmetrically provided with side grooves 102 that connect to the bottom groove 101 to accommodate the slag retaining wall 2.

[0037] The slag retaining wall 2 includes a hollow bottom beam 201 that is abutted against inside the bottom trough 101. A horizontally extending sedimentation bottom plate 202 is fixed to the top of the hollow bottom beam 201. Two sets of protective side wings 203 are symmetrically fixed to the front and rear sides of the sedimentation bottom plate 202. The outer side of the protective side wings 203 extends into the side trough 102 and abuts against the downward inclined side of the side trough 102, ensuring that the slag retaining wall 2 can be pressed into the side trough 102 and the bottom trough 101 by tilting to one side. This achieves automatic sealing of the slag retaining wall 2 in the tundish 1 without filling the gap between the slag retaining wall 2 and the tundish 1 with mortar. This improves the convenience of hoisting and replacing the slag retaining wall 2 in the tundish 1. The two sets of protective side wings 203 converge on the downward inclined side and are connected to an impact-resistant back plate 205. A guide hole 204 is provided in the middle of the impact-resistant back plate 205 as a steel flow channel.

[0038] As an optional implementation manner, the impact-resistant back plate 205 and the deposition bottom plate 202 cooperate with two groups of protective side wings 203 to form a converging mechanism with a gradually shrinking inner space. The hollow bottom beam 201 is a hollow cylindrical structure with closed front and rear ends. The top side of the deposition bottom plate 202 is flush with the top side of the hollow bottom beam 201. The diversion holes 204 are inclined holes that slope downward at one end close to the deposition bottom plate 202. The number of diversion holes 204 is three and they are distributed in a "pin" shape, ensuring that the molten steel at different depths above and below can be conveyed to the other side in the tundish 1 through the diversion holes 204. The bottom side of the bottom groove 101 is an arc that fits the outer circumferential side of the hollow bottom beam 201. A wedge-shaped protrusion 203a that extends longitudinally into the side groove 102 and abuts against the inner side of the side groove 102 is fixed on the outer side of the protective side wing 203, improving the tight sealing between the protective side wing 203 and the side groove 102. A molten steel filter is arranged inside the diversion hole 204. The molten steel filter is a cylinder that is in interference fit with the diversion hole 204, and the molten steel filter is a honeycomb structure made of silicon carbide. The diameter of the internal holes of the molten steel filter is 30 - 3 m, which can meet the filtering requirements for different molten steel purity levels;

[0039] A circular hanging lug 207 is fixed on the top side of the protective side wing 203, which is convenient for lifting the slag retaining wall 2 as a whole for disassembly, replacement. The protective side wing 203, the hollow bottom beam 201, the impact-resistant back plate 205 and the deposition bottom plate 202 are prefabricated parts integrally formed by magnesia-based basic castable. A zirconia brick layer is arranged on the side of the impact-resistant back plate 205 close to the hollow bottom beam 201, improving the impact resistance of the side of the slag retaining wall 2 receiving the impact of molten steel and enhancing the structural strength. A plurality of groups of air blowing holes 206 are longitudinally and evenly arranged on the top of the hollow bottom beam 201. An air inlet hole 209 vertically penetrates through the bottom of the hollow bottom beam 201 between adjacent air blowing holes 206. A plurality of groups of ejector rods 208 that are distributed corresponding to the air inlet holes 209 and vertically pass through the air inlet holes 209 are fixed on the inner top of the hollow bottom beam 201, and the diameter of the ejector rod 208 is smaller than the diameter of the air inlet hole 209 to avoid the ejector rod 208 affecting the smoothness of the air inlet hole 209. A plurality of groups of receiving holes 103 that are distributed corresponding to the air inlet holes 209 are longitudinally and evenly arranged in the bottom groove 101 at the bottom of the tundish 1. The receiving hole 103 is a tapered hole structure with the top end communicating with the air inlet hole 209. The bottom end of the ejector rod 208 vertically penetrates into the receiving hole 103. Three equal-pressure air distribution boxes 3 are arranged on the bottom side of the tundish 1 corresponding to the receiving holes 103. A constraint mechanism 8 for controlling the opening and closing state of the receiving hole 103 is connected to the bottoms of the three equal-pressure air distribution boxes 3;

[0040] Specifically, a sealing hole 301 is vertically penetrating the center of the bottom of the isobaric gas distribution box 3. Two sets of auxiliary holes 302 are symmetrically arranged laterally on both sides of the sealing hole 301 at the bottom of the isobaric gas distribution box 3. The constraint mechanism 8 includes three sets of pressure rods 802 corresponding to the isobaric gas distribution box 3. The pressure rods 802 vertically penetrate the bottom of the isobaric gas distribution box 3. A sealing ring is provided at the junction of the bottom of the isobaric gas distribution box 3 and the pressure rod 802. This sealing ring is made of high-temperature resistant rubber, and the pressure rod 802 slides vertically and seals against the isobaric gas distribution box 3 through this sealing ring, preventing air leakage at the junction of the pressure rod 802 and the isobaric gas distribution box 3. A sealing cone 803 is fixed at the top of the pressure rod 802, extending into the receiving hole 103. The sealing cone 803 is a frustum structure capable of pressing against the receiving hole 103 to seal the sealing hole 301, ensuring that the sealing cone 803 can tightly seal the receiving hole 103. Inside the isobaric gas separator 3, a spring is fitted on the outside of the pressure rod 802 to push the sealing cone 803 and keep the sealing cone 803 pressed upward. Two sets of auxiliary rods 805 are fixed on both sides of the sealing cone 803 and inserted into the auxiliary hole 302. The length of the auxiliary rods 805 is less than the internal height of the isobaric gas separator 3. The sealing cone 803 can be completely embedded in the receiving hole 103. When the sealing cone 803 presses against the inner wall of the receiving hole 103, the auxiliary rods 805 can be disengaged upward from the auxiliary hole 302. At this time, the receiving hole 103 is closed and the auxiliary hole 302 is open. When the slag-blocking wall 2 is installed, the sealing cone 803 is pushed downward by the top rod 208. At the same time, the auxiliary rods 805 move down to the position of closing the auxiliary hole 302. Thus, the opening and closing state of the auxiliary hole 302, which serves as the slag discharge channel, is synchronized in the opposite direction with the opening and closing state of the receiving hole 103.

[0041] Multiple isobaric gas distribution boxes 3 are all laterally connected to branch pipes 4 on their outer sides. These branch pipes 4 are collectively connected to a gas supply assembly 5. The gas supply assembly 5 includes a heat exchange tube 501 arranged in a serpentine pattern on the outer wall of the tundish 1. The heat exchange tube 501 is made of copper. By closely adhering to the outer wall of the tundish 1, the heat exchange tube 501 absorbs the heat dissipated from the tundish 1 while inert gas is introduced, thus heating the inert gas and preventing the low-temperature inert gas from affecting the normal continuous casting temperature of the molten steel. This allows for the reuse of excess heat. The bottom end of the heat exchange tube 501 is connected to an extension extending into the tundish 1. The guide pipe 502 on the bottom side of the tundish 1 has three sets of sealing joints connecting the branch pipes 4 on its outer side. The four corners of the bottom of the tundish 1 are vertically fixed with overhead steel legs 104 to support the tundish 1 in an off-ground state, so as to avoid the problem of rapid heat dissipation caused by the tundish 1 being placed directly on the ground. In addition, a stopper rod 6 is provided on the side of the tundish 1 away from the heat exchange pipe 501. The bottom of the tundish 1 is also provided with a mounting hole 105 to accommodate the stopper rod 6. The stopper rod 6 is used to control the speed at which the molten steel in the tundish 1 is transported to the next process crystallizer. This is the prior art in this field and will not be described in detail here.

[0042] Using the above structure, when installing the slag retaining wall 2 into the tundish 1, the slag retaining wall 2 is lifted into the tundish 1 as a whole by connecting the suspension lugs 207 to the crane, ensuring that the hollow bottom beam 201 can move down along the side groove 102 and abut against the bottom groove 101. At the same time, the wedge-shaped protrusions 203a on the outer side of the protective wing 203 can abut against the lower side of the side groove 102 in the inclined direction. At this time, the bottom of the slag retaining wall 2 abuts against the bottom edge, and the front and rear sides abut against the lower side of the side groove 102, thereby realizing the rapid assembly process of the slag retaining wall 2 in the tundish 1. While the slag retaining wall 2 is installed into the tundish 1, the hollow bottom beam 201 drives the top rod 208 at its inner bottom to move down into the receiving hole 103 and abut against the sealing cone 803 to seal the seal. The cone disc 803 is pressed down until it is disengaged from the receiving hole 103, releasing the sealing effect of the sealing cone disc 803 on the receiving hole 103. At the same time, the auxiliary rod 805 moves down to the position of extending into the auxiliary hole 302, sealing the auxiliary hole 302. At this time, the isobaric gas distribution box 3 can be connected to the tundish 1 in sequence through the receiving hole 103, the air inlet 209 and the blowing hole 206. It can be connected to the external gas supply equipment through the heat exchange pipe 501 so that the inert gas can be fed upward into the hollow bottom beam 201 along the heat exchange pipe 501, the guide pipe 502 and the isobaric gas distribution box 3, and discharged upward into the tundish 1 along the blowing hole 206. The inert gas is discharged through the blowing hole 206 to promote the tumbling of the molten steel in the dead zone position on the bottom side of the slag retaining wall 2, thereby promoting the floating of the slag inclusions in the molten steel.

[0043] Molten steel injected into the tundish 1 through the ladle is blocked by the slag-blocking wall 2 on the side near the heat exchange tube 501. The impact-resistant back plate 205 is used to block the molten steel, ensuring that the molten steel can only flow to the other side of the tundish 1 through the guide hole 204 on the inclined impact-resistant back plate 205. This reduces the volume of the dead zone of molten steel inside the tundish 1 through the inclined slag-blocking wall 2, thereby reducing the problem of slag inclusion deposition caused by poor flowability of molten steel in the dead zone.

[0044] By setting an inclined side groove 102 and an arc-shaped bottom groove 101 inside the tundish 1, and setting an inclined slag retaining wall 2, the protective side wings 203 are embedded in the side groove 102, and the bottom side of the hollow bottom beam 201 is pressed against the inner arc surface of the bottom groove 101, thereby ensuring that the slag retaining wall 2 can be placed inclined inside the tundish 1 to buffer the molten steel, reduce the dead zone problem caused by poor molten steel flow at the contact point between the bottom side of the slag retaining wall and the tundish 1, promote the flow of molten steel along the guide hole 204 of the inclined impact-resistant back plate 205, thereby promoting the floating of slag inclusions and improving the cleanliness of molten steel.

[0045] In addition, by tilting the slag retaining wall 2, the weight of the slag retaining wall 2 can be used to press it against the side groove 102 and the bottom side tilted downwards. Thus, the weight of the slag retaining wall 2 can achieve the sealing of the contact position between its outer edge and the tundish 1. There is no need to apply mortar coating for sealing, which improves the convenience of replacing the slag retaining wall inside the tundish 1 and the sealing efficiency, replacing the traditional sealing method and improving production efficiency.

[0046] In addition, the slag retaining wall 2 can be connected to the isobaric gas distribution box 3 through a lifting and moving sealing cone 803. When the slag retaining wall 2 is assembled into the tundish 1, the top rod 208 extending downward into the receiving hole 103 inside the hollow bottom beam 201 can be used to push the sealing cone 803 downward, so that the gas outlet channel is automatically connected after the slag retaining wall 2 is assembled. Inert gas can be discharged upward through the gas outlet channel to promote the tumbling of molten steel and achieve the slag floating action.

[0047] When the slag retaining wall 2 is lifted up for replacement, the sealing cone 803 is pushed by the spring to press against the receiving hole 103 again to achieve automatic closure of the air outlet channel. At the same time, the sealing cone 803 drives the auxiliary rod 805 to move upward and disengage from the auxiliary hole 302, changing the closed state of the auxiliary hole 302 to the open state. At this time, air can continue to be introduced into the isobaric gas distribution box 3 to promote the downward discharge of molten steel and slag and other impurities falling into the isobaric gas distribution box 3, without the need for manual cleaning.

[0048] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-strength, slag-resistant embedded retaining wall, characterized in that: It includes a tundish (1) and a slag retaining wall (2). The slag retaining wall (2) is inclined and arranged in the middle of the tundish (1). A bottom groove (101) is arranged at the bottom inside the tundish (1). Side grooves (102) for accommodating the slag retaining wall (2) and communicating with the bottom groove (101) are symmetrically arranged on the front and rear side walls inside the tundish (1). The slag retaining wall (2) includes a hollow bottom beam (201) tightly arranged inside the bottom groove (101). A horizontally extending deposition bottom plate (202) is fixed on the top of the hollow bottom beam (201). Two groups of protective side wings (203) are symmetrically fixed on the front and rear sides of the deposition bottom plate (202). The outer sides of the protective side wings (203) extend into the side grooves (102) and are tightly abutted against the downward inclined side of the side grooves (102). The downward inclined sides of the two groups of protective side wings (203) are gathered together and connected with an impact-resistant back plate (205). A diversion hole (204) is arranged in the middle of the impact-resistant back plate (205). The impact-resistant back plate (205) and the deposition bottom plate (202) cooperate with the two groups of protective side wings (203) to form a converging mechanism with a gradually shrinking inner space. The hollow bottom beam (201) is a hollow cylindrical structure with both front and rear ends closed. The top side of the deposition bottom plate (202) is flush with the top side of the hollow bottom beam (201). The diversion hole (204) is an inclined hole inclined downward at one end close to the deposition bottom plate (202). The number of the diversion holes (204) is three and they are distributed in a "pin" shape. The bottom side of the bottom groove (101) is an arc conforming to the outer circumferential side of the hollow bottom beam (201). A wedge-shaped convex block (203a) longitudinally extending into the side groove (102) and tightly abutted against the inner side of the side groove (102) is fixed on the outer side of the protective side wing (203). A molten steel filter is arranged inside the diversion hole (204). The molten steel filter is a cylinder in interference fit with the diversion hole (204), and the molten steel filter is a honeycomb structure made of silicon carbide material. A circular hanging lug (207) is fixed on the top side of the protective side wing (203). The protective side wing (2)03), the hollow bottom beam (201), the impact-resistant back plate (205) and the deposition bottom plate (202) are prefabricated parts integrally formed by magnesia-based basic castable. A zirconia brick layer is arranged on the side of the impact-resistant back plate (205) close to the hollow bottom beam (201). Multiple groups of air blowing holes (206) are longitudinally and evenly arranged on the top of the hollow bottom beam (201). An air inlet hole (209) vertically penetrates through the bottom of the hollow bottom beam (201) between adjacent air blowing holes (206). Multiple groups of ejector rods (208) corresponding to the air inlet holes (209) and vertically passing through the air inlet holes (209) are fixed on the inner top of the hollow bottom beam (201), and the diameter of the ejector rod (208) is smaller than the diameter of the air inlet hole (209). Multiple sets of receiving holes (103) corresponding to the air inlet (209) are evenly arranged longitudinally in the bottom groove (101) of the intermediate package (1). The receiving hole (103) is a conical hole structure with the top end connected to the air inlet (209). The bottom end of the top rod (208) is vertically inserted into the receiving hole (103). Three sets of isobaric gas distribution boxes (3) are arranged on the bottom side of the intermediate package (1) corresponding to the receiving hole (103). The bottom of the three sets of isobaric gas distribution boxes (3) are connected to a constraint mechanism (8).

2. The high-strength slag-resistant embedded slag retaining wall according to claim 1, characterized in that: The isobaric gas distribution box (3) has a vertically penetrating sealing hole (301) at the bottom center. Two sets of auxiliary holes (302) are symmetrically arranged on the bottom of the isobaric gas distribution box (3) on both sides of the sealing hole (301). The constraint mechanism (8) includes three sets of pressure rods (802) distributed corresponding to the isobaric gas distribution box (3). The pressure rods (802) penetrate vertically through the bottom of the isobaric gas distribution box (3). A sealing ring is provided at the bottom of the isobaric gas distribution box (3) where it connects with the pressure rods (802). The sealing ring is made of high-temperature resistant rubber, and the pressure rods (802) slide vertically and seal with the isobaric gas distribution box (3) through the sealing ring.

3. The high-strength slag-resistant embedded slag retaining wall according to claim 2, characterized in that: The top of the pressure rod (802) is fixed with a sealing cone (803) that extends into the receiving hole (103). The sealing cone (803) is a frustum structure that can press against the receiving hole (103) to seal the sealing hole (301). The pressure rod (802) inside the isobaric gas distribution box (3) is fitted with a spring that pushes the sealing cone (803) to keep the sealing cone (803) pressed upward. Two sets of auxiliary rods (805) are fixed on both sides of the sealing cone (803) that are vertically inserted into the auxiliary hole (302). The length of the auxiliary rod (805) is less than the internal height of the isobaric gas distribution box (3).

4. The high-strength slag-resistant embedded slag retaining wall according to claim 3, characterized in that: Multiple sets of isobaric gas distribution boxes (3) are connected laterally to branch pipes (4) on the outside. Multiple sets of branch pipes (4) are connected to a gas supply assembly (5) on the outside. The gas supply assembly (5) includes a heat exchange pipe (501) arranged in a serpentine manner on the outer wall of the intermediate package (1). The bottom end of the heat exchange pipe (501) is connected to a guide pipe (502) extending to the bottom side of the intermediate package (1). Three sets of sealing joints connecting the branch pipes (4) are provided on the outside of the guide pipe (502). The four corners of the bottom of the intermediate package (1) are vertically fixed with overhead steel legs (104) that support the intermediate package (1) in an off-ground state.

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