RH furnace dip pipe and method

Abstract

Flanges at the top ends of an outer barrel and a steel liner are provided with connecting pieces, the outer barrel and the steel liner are detachably connected through a connecting assembly, the links of repeated positioning, datum conversion and the like in step-by-step operation are omitted, the machining period is greatly shortened, the production efficiency is improved, a combined brick and the steel liner are matched in a sliding and embedded mode, and the service life of the RH furnace is prolonged. Standardization and precision of masonry positioning are achieved, manual positioning errors are reduced, it is guaranteed that the combined bricks are tightly attached to the inner wall of the steel liner, the flatness and structural stability of the inner wall of the dip pipe are improved, the matched intelligent pouring procedure can monitor the pouring material filling state in real time, potential quality hazards such as cavities and gaps can be found and avoided in time, and the production efficiency is improved. Compared with a traditional passive quality inspection mode, active control over the pouring quality is achieved, and the product percent of pass is increased; and meanwhile, the standardized process flow is convenient for recording and tracing quality data, and the intelligent production requirement is met.

Description

Technical Field

[0001] This invention relates to the field of metallurgical refractory material manufacturing technology, specifically to an RH furnace impregnation tube and method. Background Technology

[0002] The RH furnace (RH vacuum refining furnace) is a key piece of equipment in the steelmaking process for achieving deep refining of molten steel. Its core component, the immersion tube, plays a vital role in the circulation and refining reaction of molten steel, directly affecting the quality of the refined steel, production efficiency, and the service life of the equipment. The immersion tube operates in a harsh environment, needing to withstand the scouring of high-temperature molten steel, chemical corrosion, and thermal shock for extended periods. Therefore, extremely high requirements are placed on its structural strength, refractory properties, and forming precision.

[0003] Referring to patent CN210711624U, an RH furnace impregnation tube is disclosed, including an impregnation tube body, which comprises a casting body, a steel liner, and a refractory layer. The outer wall of the steel liner is fixed with several symmetrical anchors, one end of which is fixed with a hook. The hooks and anchors are embedded and connected to the casting body. The bottom end of the steel liner is fixed with two symmetrical steel structural members, both of which are embedded and connected to the casting body. The beneficial effects of this invention are that the anchors, steel structural members, steel tenons, and polyhedral cavities transform the surface-to-surface contact between the casting body, steel liner, and refractory layer into a body contact, increasing the bonding strength between them, preventing detachment, and improving service life and overall integrity. The annular corundum further enhances the thermal shock stability, strength, and erosion resistance of the impregnation tube body, making it more durable in the working environment of molten steel erosion. This leads to the following:

[0004] The existing processing technology for RH furnace impregnation tubes mostly adopts a step-by-step "masonry + casting" approach, which has several technical defects: First, the process is highly discrete, requiring manual positioning of refractory bricks before casting. Inconsistent positioning benchmarks between masonry and casting can easily lead to coaxiality deviations and insufficient inner wall flatness, affecting subsequent molten steel flow efficiency and refining effects. Second, the fixing methods between the outer cylinder and the steel liner are rudimentary, often using simple bolt fastening or welding for positioning, making it difficult to ensure coaxiality. This can easily lead to gap misalignment during casting, resulting in poor sealing of the casting cavity. The following issues arise: First, inadequate sealing leads to refractory leakage and uneven filling, resulting in voids, gaps, and other quality hazards. Second, refractory bricklaying relies on manual experience, resulting in low positioning accuracy and efficiency, and insufficient stability of the bricks after laying, making them prone to displacement during pouring. Third, the lack of effective monitoring methods during the pouring process makes it impossible to monitor the refractory filling status in real time, leading to passive quality control. Fourth, the demolding and disassembly process is cumbersome, with traditional fixed structures often requiring only one-time connection or difficult disassembly, which can easily damage the molded impregnated tube structure. Additionally, the poor reusability of components increases processing costs.

[0005] As the steel industry develops towards intelligence and efficiency, the existing step-by-step processing technology can no longer meet the production requirements of high precision, high quality and low cost. There is an urgent need to develop an integrated structure and processing method that can achieve coordinated positioning, intelligent control and convenient demolding of masonry and pouring, so as to solve the problems of low positioning accuracy, complicated procedures, unstable quality and high cost in the existing technology. Summary of the Invention

[0006] The purpose of this invention is to provide an RH furnace impregnation tube and method to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an integrated structure for intelligent construction and casting of RH furnace impregnation tubes, comprising a base plate and fixing components fixedly installed on both sides of the upper end of the base plate. An outer cylinder is detachably installed on the inner side of the fixing components, and a steel liner is assembled inside the outer cylinder. Connecting ears are provided on both sides of the top of the outer cylinder and at positions corresponding to the top of the steel liner. The two sets of connecting ears are arranged vertically aligned. An installation groove is provided on the inner side of each set of connecting ears, and a connecting component is detachably installed in the installation groove.

[0008] An annular casting cavity is formed between the outer cylinder and the steel liner, and the interior of the steel liner is detachably fitted with composite bricks.

[0009] As a preferred embodiment of the present invention, the fixing component includes fixing rings fixed on both sides of the upper end of the base plate, and a connecting seat is welded to the upper end of the middle part of the outer side of the fixing ring. A connecting rod is threaded through the connecting seat, and the tail end of the connecting rod is threaded to the outer cylinder.

[0010] As a preferred embodiment of the present invention, the two fixing rings are fitted with the outer cylinder with a clearance.

[0011] In a preferred embodiment of the present invention, the connecting assembly includes studs embedded in two mounting slots, each stud having a connecting block welded to its outer end, and the inner ends of each stud being threaded with the same threaded sleeve.

[0012] As a preferred embodiment of the present invention, each of the two studs is fitted with a nut, and the threads on the two studs are in opposite directions.

[0013] As a preferred embodiment of the present invention, the diameter of the connecting block is larger than the diameter of the mounting groove.

[0014] As a preferred embodiment of the present invention, the inner walls on both sides of the steel liner are provided with limiting grooves, and the bottom of the limiting grooves is a closed structure. The two sides of the combined brick are provided with connecting strips, and the connecting strips are slidably embedded in the limiting grooves. The outer wall of the combined brick is in contact with the inner wall of the steel liner.

[0015] As a preferred embodiment of the present invention, the inner bottom of the outer cylinder is provided with a base, and the bottom of the steel liner is provided with a bottom groove that matches the base, and the base and the bottom groove are positioned and fitted together.

[0016] As a preferred embodiment of the present invention, the casting method based on this structure includes the following steps:

[0017] S1. System assembly and positioning: First, the outer cylinder is detachably fixed by the fixing components on the base plate. Then, the bottom groove at the bottom of the steel liner is installed in accordance with the base at the bottom of the outer cylinder, so that the steel liner and the outer cylinder are set coaxially. Then, the connecting components are used to pass through the mounting groove in the connecting ears aligned with the outer cylinder and the steel liner to lock and fix the outer cylinder and the steel liner, forming a sealed annular casting cavity.

[0018] S2. Pouring preparation: The composite bricks are slidably embedded into the limiting grooves of the inner wall of the steel tank through the connecting strips on both sides, so that the inner wall of the composite bricks fits against the inner wall of the steel tank and is positioned, thus completing the intelligent masonry positioning process before pouring.

[0019] As a preferred embodiment of the present invention, the following casting and subsequent processes are also included:

[0020] S3. Intelligent pouring: The pouring material is injected into the annular pouring cavity formed in step S1 through the preset pouring port. The filling status of the pouring material is monitored in real time during the pouring process to ensure that the pouring material is evenly filled to all areas of the pouring cavity and to avoid voids or gaps.

[0021] S4. Curing and Demolding: After casting, keep the system assembly unchanged and perform curing treatment on the cast material for a preset time. After curing, first disassemble the connecting components to release the locking between the outer cylinder and the steel liner, then adjust the fixing components to loosen the fixing of the outer cylinder, remove the outer cylinder, and finally take out the combined bricks through the matching structure of the limiting groove and the connecting strip to complete the integrated processing of the RH furnace impregnation tube masonry and casting.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. In this invention, by providing connecting parts on the flanges at the top of both the outer cylinder and the steel liner, the outer cylinder and the steel liner are detachably connected by connecting components. This integrates the traditional step-by-step masonry positioning and casting molding processes into a synchronous and collaborative process, eliminating the need for repetitive positioning and reference conversion in the step-by-step operations, significantly shortening the processing cycle and improving production efficiency.

[0024] 2. In this invention, the composite bricks are slidably fitted into the limiting groove on the inner wall of the steel liner through the connecting strip, which realizes the standardization and precision of the masonry positioning, reduces the error of manual positioning, ensures that the composite bricks are tightly fitted to the inner wall of the steel liner, and improves the flatness of the inner wall of the impregnation tube and the structural stability.

[0025] 2. The intelligent pouring process in this invention can monitor the filling status of the castable in real time, and can promptly detect and avoid quality hazards such as voids and gaps. Compared with the traditional passive quality inspection mode, it realizes the active control of pouring quality and improves the product qualification rate. At the same time, the standardized process flow facilitates the recording and traceability of quality data, which meets the requirements of intelligent production. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is an exploded structural diagram of the base plate and outer cylinder of the present invention;

[0028] Figure 3 This is an exploded view of the steel liner and flange of the present invention;

[0029] Figure 4 This is a front view of a partial internal structure of the outer cylinder and the steel liner of the present invention;

[0030] Figure 5 This is an exploded view of the connecting ear and connecting assembly of the present invention;

[0031] Figure 6 This is a front view of the internal structure of the connection component of the present invention;

[0032] Figure 7 This is a top view of the connection structure between the connecting ear and the connecting component of the present invention.

[0033] In the diagram: 1. Base plate; 2. Fixing component; 21. Fixing ring; 22. Connecting rod; 23. Connecting seat; 3. Outer cylinder; 4. Steel liner; 5. Flange; 6. Connecting lug; 7. Mounting groove; 8. Connecting component; 81. Connecting block; 82. Stud; 83. Threaded cylinder; 84. Nut; 9. Composite brick; 10. Limiting groove; 11. Connecting strip; 12. Casting cavity; 13. Base; 14. Bottom groove. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0035] In the description of this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and 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, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of this invention, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 a connection through an intermediate medium; and they can refer to the internal communication between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances. "Multiple" means two or more, and unless otherwise explicitly limited, all such meanings fall within the scope of protection of this invention.

[0037] Example

[0038] like Figure 1-7 As shown, the present invention provides a technical solution: including a base plate 1 and fixing components 2 fixedly installed on both sides of the upper end of the base plate 1. An outer cylinder 3 is detachably installed on the inner side of the fixing components 2. A steel liner 4 is assembled inside the outer cylinder 3. Connecting ears 6 are provided on both sides of the top of the outer cylinder 3, corresponding to the top of the steel liner 4. The two sets of connecting ears 6 are arranged vertically aligned. An installation groove 7 is opened on the inner side of each set of connecting ears 6. A connecting component 8 is detachably installed in the installation groove 7, which can be installed and disassembled according to the needs of pouring. Figure 1 and 6 As shown;

[0039] An annular casting cavity 12 is formed between the outer cylinder 3 and the steel liner 4. The interior of the steel liner 4 contains detachable modular bricks 9, facilitating the installation and disassembly of the assembly. Figure 3 As shown.

[0040] The fixing component 2 includes fixing rings 21 fixed to both sides of the upper end of the base plate 1. A connecting seat 23 is welded to the upper middle part of the outer side of the fixing ring 21. A connecting rod 22 is threaded through the connecting seat 23, and the tail end of the connecting rod 22 is threaded to the outer cylinder 3. Before pouring, the outer cylinder is placed on the placement plate and fixed using the fixing component to ensure its stability. Figure 1and 2 As shown.

[0041] The two fixing rings 2 are fitted with the outer cylinder 3 with a clearance to prevent the outer cylinder from shaking during the pouring process. Figure 2 As shown.

[0042] The connecting assembly 8 includes studs 82 embedded in two mounting slots 7. Each stud 82 has a connecting block 81 welded to its outer end, and the inner ends of each stud 82 are threaded with the same threaded sleeve 84. By adjusting the threaded sleeve, the steel liner is securely fixed inside the outer cylinder. Figure 1 and 5 As shown in -7.

[0043] Nuts 84 are installed on both studs 82, and the threads on the two studs 82 turn in opposite directions, which facilitates adjustment of the distance between the two studs, thereby fixing the outer cylinder and the steel liner. Figure 1-2 As shown.

[0044] The diameter of the connecting block 81 is larger than the diameter of the mounting groove 7, allowing the outer cylinder and the steel liner to be fixed together using a connecting assembly. Figure 5 and 6 As shown.

[0045] Both sides of the inner wall of the steel liner 4 are provided with limiting grooves 10, and the bottom of the limiting grooves 10 is a closed structure. Both sides of the combined brick 9 are provided with connecting strips 11, and the connecting strips 11 are slidably embedded in the limiting grooves 10. The outer wall of the combined brick 9 is in close contact with the inner wall of the steel liner 4, so that the steel liner can be firmly installed in the outer cylinder. Figure 3 and 4 As shown.

[0046] The inner bottom of the outer cylinder 3 is provided with a base 13, and the bottom end of the steel liner 4 is provided with a bottom groove 14 that matches the base 13. The base 13 and the bottom groove 14 are positioned and fitted together, so that the steel liner can be firmly installed inside the outer cylinder. Figure 4 As shown.

[0047] The casting method based on this structure includes the following steps:

[0048] S1. System assembly and positioning: First, the outer cylinder 3 is detachably fixed by the fixing component 2 on the base plate 1. Then, the bottom groove 14 at the bottom of the steel liner 4 is installed in correspondence with the base 13 at the bottom of the outer cylinder 3, so that the steel liner 4 and the outer cylinder 3 are coaxially set. Then, the connecting component 8 is used to pass through the mounting groove 7 in the connecting ear 6 aligned with the outer cylinder 3 and the steel liner 4 to lock and fix the outer cylinder 3 and the steel liner 4, forming a sealed annular casting cavity 12.

[0049] S2. Pouring preparation: The combined brick 9 is slidably embedded into the limiting groove 10 on the inner wall of the steel tank 4 through the connecting strips 11 on both sides, so that the inner wall of the combined brick 9 fits against the inner wall of the steel tank 4 and is positioned, thus completing the intelligent masonry positioning process before pouring.

[0050] This also includes the following pouring and subsequent procedures:

[0051] S3. Intelligent pouring: The pouring material is injected into the annular pouring cavity 12 formed in step S1 through the preset pouring port. The filling status of the pouring material is monitored in real time during the pouring process to ensure that the pouring material is evenly filled to all areas of the pouring cavity 12 and to avoid voids or gaps.

[0052] S4. Curing and Demolding: After casting, keep the system assembly unchanged and perform curing treatment on the cast material for a preset time. After curing, first disassemble the connecting component 8 to release the locking between the outer cylinder 3 and the steel liner 4, then adjust the fixing component 2 to loosen the fixing of the outer cylinder 3, remove the outer cylinder 3, and finally remove the combined brick 9 through the cooperation structure of the limiting groove 10 and the connecting strip 11, completing the integrated processing of the RH furnace impregnation tube masonry and casting.

[0053] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An integrated structure for intelligent construction and casting of RH furnace impregnation tubes, comprising a base plate (1) and fixing components (2) fixedly installed on both sides of the upper end of the base plate (1), characterized in that: The inner side of the fixing component (2) is detachably installed with an outer cylinder (3), and a steel liner (4) is installed inside the outer cylinder (3). Connecting ears (6) are provided on both sides of the top of the outer cylinder (3) and at the corresponding positions of the top of the steel liner (4). The two sets of connecting ears (6) are arranged vertically aligned. An installation groove (7) is provided on the inner side of the two sets of connecting ears (6). A connecting component (8) is detachably installed in the installation groove (7). An annular casting cavity (12) is formed between the outer cylinder (3) and the steel liner (4), and the steel liner (4) is detachably fitted with composite bricks (9).

2. The integrated intelligent masonry and casting structure for RH furnace impregnation tubes according to claim 1, characterized in that: The fixing component (2) includes fixing rings (21) fixed on both sides of the upper end of the base plate (1), and a connecting seat (23) is welded to the upper part of the middle of the outer side of the fixing ring (21). A connecting rod (22) is threaded through the connecting seat (23), and the tail end of the connecting rod (22) is threaded to the outer cylinder (3).

3. The integrated intelligent masonry and casting structure for RH furnace impregnation tubes according to claim 2, characterized in that: The two fixing rings (2) are fitted with the outer cylinder (3) with a clearance.

4. The integrated intelligent masonry and casting structure for RH furnace impregnation tubes according to claim 1, characterized in that: The connecting assembly (8) includes studs (82) embedded in two mounting slots (7), with connecting blocks (81) welded to the outer ends of the two studs (82), and the same threaded cylinder (84) threaded onto the inner ends of the two studs (82).

5. The integrated intelligent masonry and casting structure for RH furnace impregnation tubes according to claim 4, characterized in that: Nuts (84) are installed on both studs (82), and the threads on the two studs (82) are in opposite directions.

6. The integrated intelligent masonry and casting structure for RH furnace impregnation tubes according to claim 4, characterized in that: The diameter of the connecting block (81) is larger than the diameter of the groove of the mounting groove (7).

7. The integrated intelligent masonry and casting structure for RH furnace impregnation tubes according to claim 1, characterized in that: The inner walls of both sides of the steel liner (4) are provided with limiting grooves (10), and the bottom of the limiting grooves (10) is a closed structure. Both sides of the combined brick (9) are provided with connecting strips (11), and the connecting strips (11) are slidably embedded in the limiting grooves (10). The outer wall of the combined brick (9) is in contact with the inner wall of the steel liner (4).

8. The integrated control method for intelligent masonry and casting of RH furnace impregnation tubes according to claim 1, characterized in that: The inner bottom of the outer cylinder (3) is provided with a base (13), and the bottom of the steel liner (4) is provided with a bottom groove (14) that is compatible with the base (13), and the base (13) and the bottom groove (14) are positioned and fitted together.

9. The integrated intelligent masonry and casting structure for RH furnace impregnation tubes according to claim 1, characterized in that: The casting method based on this structure includes the following steps: S1. System assembly and positioning: First, fix the outer cylinder (3) detachably using the fixing component (2) on the base plate (1). Then, install the bottom groove (14) at the bottom of the steel liner (4) and the base (13) at the bottom of the outer cylinder (3) in a corresponding manner, so that the steel liner (4) and the outer cylinder (3) are set coaxially. Then, use the connecting component (8) to pass through the mounting groove (7) in the connecting ear (6) aligned on the outer cylinder (3) and the steel liner (4) to lock and fix the outer cylinder (3) and the steel liner (4) to form a sealed annular casting cavity (12). S2. Pouring preparation: The combined brick (9) is slidably embedded into the limiting groove (10) on the inner wall of the steel liner (4) through the connecting strips (11) on both sides, so that the inner wall of the combined brick (9) fits against the inner wall of the steel liner (4) and is positioned, thus completing the intelligent masonry positioning process before pouring.

10. The casting method according to claim 9, characterized in that, This also includes the following pouring and subsequent procedures: S3, Intelligent pouring: The pouring material is injected into the annular pouring cavity (12) formed in step S1 through the preset pouring port. The filling status of the pouring material is monitored in real time during the pouring process to ensure that the pouring material is evenly filled to each area of ​​the pouring cavity (12) and to avoid voids or gaps. S4. Curing and Demolding: After the casting is completed, keep the system assembly state unchanged and perform curing treatment on the casting material for a preset time. After curing, first disassemble the connecting component (8) to release the locking between the outer cylinder (3) and the steel liner (4), then adjust the fixing component (2) to loosen the fixing of the outer cylinder (3), remove the outer cylinder (3), and finally take out the combined brick (9) through the matching structure of the limiting groove (10) and the connecting strip (11) to complete the integrated processing of the RH furnace impregnation tube masonry and casting.

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