A kind of intermediate ladle nozzle structure for stopper

Abstract

The utility model discloses a kind of intermediate ladle nozzle structures for stopper, belong to metallurgical equipment technical field, including intermediate ladle, nozzle and stopper. Nozzle is set in the bottom of intermediate ladle, multiple limiting parts are provided on nozzle, and overflow passage is formed between adjacent limiting parts. Stopper is provided with guiding part corresponding to the contact of multiple limiting parts. Limiting part is the limiting guide structure that nozzle top wall protrudes, guiding part is the contact surface that stopper is matched with limiting part, guiding part slides along limiting part inner wall when stopper drops, and the centring of stopper axis and nozzle axis is forced to correct. Overflow passage is the gap between limiting part, for molten steel flow. The mechanical guide pair formed by limiting part and guiding part can constrain stopper radial deviation, avoid unilateral erosion nozzle or molten steel leakage.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical equipment technology, specifically a tundish nozzle structure for stopper rods. Background Technology

[0002] In continuous steel casting, the tundish stopper rod control system is the core device for regulating the molten steel flow rate. It controls the opening and closing of the nozzle through the rising and falling motion of the stopper rod, thus achieving precise adjustment of the pouring flow rate. The alignment of the stopper rod axis with the nozzle axis is a crucial prerequisite for ensuring accurate flow control.

[0003] However, in actual production, the stopper rod system often experiences axial misalignment due to the following factors: In the high-temperature molten steel environment, uneven thermal expansion of the stopper rod and transmission mechanism causes dynamic misalignment between the stopper rod's trajectory and the nozzle axis; equipment vibration and the impact force of the flowing steel cause loosening of the stopper rod's positioning, exacerbating axial drift. Eccentric contact causes the nozzle's inner wall to be eroded by the high-speed steel flow on one side, shortening the nozzle's service life; in cases of severe misalignment, the stopper rod cannot completely seal the nozzle, leading to safety accidents such as steel leakage or uncontrolled flow.

[0004] Patent CN204159864U discloses a stopper rod nozzle flow control structure, including a nozzle and a stopper rod disposed on the bottom surface of an tundish. An annular groove coaxial with the nozzle is also provided on the bottom surface of the tundish. The stopper rod includes a flow-blocking ring disposed at its lower end. The flow-blocking ring is a bowl-shaped structure with its opening facing the nozzle. The sidewall of the flow-blocking ring fits into the annular groove, and a flow passage gap exists between the sidewall of the flow-blocking ring and the annular groove. This structure facilitates alignment between the stopper rod and the nozzle, but makes it difficult for molten steel to drain from the annular groove on the bottom surface of the tundish, easily leading to steel accumulation, cooling, and solidification, thus losing its guiding function. Utility Model Content

[0005] The purpose of this invention is to provide a tundish nozzle structure for stopper rods to solve the problems mentioned in the prior art.

[0006] A stopper rod tundish nozzle structure is provided, comprising:

[0007] Intermediate package;

[0008] The water inlet is located at the bottom of the tundish and has multiple limiting parts, forming a flow channel between adjacent limiting parts.

[0009] A stopper rod, wherein the stopper rod is provided with a guide portion that contacts a plurality of limiting portions.

[0010] Furthermore, the limiting part is integrally formed with the sprue. The limiting part and the sprue are integrally cast or machined, preventing the separate limiting part from detaching or deforming at high temperatures, reducing assembly errors, and improving guiding accuracy. In addition, the limiting part, integrally formed with the sprue, can be removed from the tundish along with the sprue for maintenance and replacement.

[0011] Furthermore, a first arc-shaped chamfer is provided between the top of the limiting part and the contact surface of the limiting part near the guide part. The first arc-shaped chamfer is an arc-shaped transition area between the top of the limiting part and the contact surface of the side wall, providing a smooth transition surface, reducing mechanical interference during the lifting and lowering of the stopper rod, and making the interference process between the limiting part and the guide part natural and smooth.

[0012] Furthermore, a second arc-shaped chamfer is provided between the bottom of the guide portion and the contact surface of the guide portion near the limiting portion. The second arc-shaped chamfer forms an arc-shaped transition area between the bottom of the guide portion and the contact surface of the side wall, providing a smooth transition surface, reducing mechanical interference during the descent of the stopper rod, and making the interference process between the limiting portion and the guide portion natural and smooth.

[0013] Furthermore, a third arc-shaped chamfer is provided between the top of the guide portion and the contact surface of the guide portion near the limiting portion. The third arc-shaped chamfer is an arc-shaped transition area between the top of the guide portion and the contact surface of the side wall, providing a smooth transition surface, reducing mechanical interference during the rise of the stopper rod, and making the interference process between the limiting portion and the guide portion natural and smooth.

[0014] Furthermore, a bottom-blowing channel extends through the stopper rod, reaching the guide section and communicating with the inner cavity of the tundish through the guide section. The bottom-blowing channel is a gas passage penetrating the stopper rod, through which inert gas is discharged from the guide section into the bottom of the tundish, realizing the bottom-blowing process.

[0015] Furthermore, the guide portion includes a collar and several guide blocks, the guide blocks being arranged circumferentially along the collar. The guide portion and the stopper rod are designed separately, with the guide blocks fixed to the periphery of the stopper rod by the collar.

[0016] Furthermore, the contact surface between the collar and the stopper rod is recessed inward to form a gas collecting cavity, and several guide blocks are connected to the bottom blowing channel through the gas collecting cavity. The gas collecting cavity inside the collar is an inert gas distribution cavity, which connects the single-channel bottom blowing channel with the through holes on multiple guide blocks and distributes the gas centrally, simplifying the channel structure. While achieving airflow distribution, it reduces the assembly difficulty between the guide part and the stopper rod.

[0017] Furthermore, the guide portion and the stopper rod are interference-fitted. The guide portion and the stopper rod are tightly fitted to eliminate assembly clearance.

[0018] Furthermore, retaining rings are provided between the two ends of the guide and the stopper rod. The retaining rings are annular limiting members at both ends of the guide to resist axial displacement of the guide, ensure that the guide does not fall off at high temperatures, and maintain guiding stability.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] The limiting part is a protruding limiting and guiding structure on the top wall of the nozzle, and the guiding part is the contact surface on the stopper rod that mates with the limiting part. When the stopper rod descends, the guiding part slides along the inner wall of the limiting part, forcibly correcting the alignment of the stopper rod axis with the nozzle axis. The flow channel is the gap between the limiting parts, allowing molten steel to flow. The mechanical guiding pair formed by the limiting part and the guiding part can restrain the radial displacement of the stopper rod, preventing unilateral erosion of the nozzle or molten steel leakage. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this drawing 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 this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 A schematic cross-sectional view of a stopper rod tundish nozzle structure;

[0023] Figure 2 A partial structural diagram of an intermediate sprue nozzle structure for a stopper rod;

[0024] Figure 3 A structural diagram showing the fit between the stopper rod and the sprue provided by this utility model;

[0025] Figure 4 A cross-sectional view of the stopper rod and sprue provided by this utility model.

[0026] In the diagram: 1. Intermediate tundish; 2. Sprue; 21. Limiting part; 22. Flow channel; 3. Stopper rod; 31. Guide part; 311. Collar ring; 312. Guide block; 313. Air collection chamber; 41. First arc chamfer; 42. Second arc chamfer; 43. Third arc chamfer; 5. Bottom blowing channel; 6. Retaining ring. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated 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 scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0028] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0029] However, there may be instances where unnecessary detailed descriptions are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of essentially the same structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0030] Please see Figure 1 and Figure 2 As shown in the embodiment of this utility model, a stopper rod tundish nozzle structure includes a tundish 1, a nozzle 2, and a stopper rod 3. The nozzle 2 is disposed at the bottom of the tundish 1, and a plurality of limiting parts 21 are provided on the nozzle 2, forming a flow channel 22 between adjacent limiting parts 21. The stopper rod 3 is provided with guide parts 31 that correspond to and contact the plurality of limiting parts 21.

[0031] The limiting part 21 is a protruding structure extending outward from the top wall of the nozzle 2, forming a surface contact with the guide part 31 of the stopper rod 3, restricting the radial degree of freedom of the end of the stopper rod 3, and providing a reference axis for the stopper rod 3. The limiting part 21 and the flow channel 22 form an integrated skeleton-gap structure, in which the protruding part serves as a guide, and the gap part allows molten steel to flow. The nozzle 2 has an arc-shaped constriction that contacts and fits with the end of the stopper rod 3. When the stopper rod 3 descends, the guide part 31 slides along the inner wall of the limiting part 21 until the stopper rod 3 and the arc-shaped constriction are in close contact in the circumferential direction. The guide part 31 is a hard block distributed circumferentially at the lower end of the stopper rod 3, forming a high-temperature sliding pair with the limiting part 21. Under the constraint of the limiting part 21, it adaptively adjusts its posture, forcing the stopper rod 3 to precisely fit with the nozzle 2.

[0032] The limiting part 21 and the nozzle 2 are integrally formed, which avoids the risk of high-temperature molten steel intrusion into the interface seam caused by separate parts. After the limiting part 21 and the nozzle 2 are integrally formed, their thermal expansion is isotropic, which avoids large uneven deformation of the limiting part 21 and thus prevents radial displacement of the stopper rod 3. In addition, since the nozzle 2 and the tundish 1 are usually designed separately, when the limiting part 21 has defects such as wear, blockage, or corrosion, the limiting part 21 can be removed along with the nozzle 2 for maintenance or replacement, without having to operate inside the tundish 1.

[0033] A first arc-shaped chamfer 41 is provided between the top of the limiting part 21 and the contact surface of the limiting part 21 near the guide part 31. The first arc-shaped chamfer 41 provides initial guidance when the stopper rod 3 descends, avoiding interference between the guide part 31 and the limiting part 21, which would make it difficult to engage smoothly. In addition, regardless of whether the stopper rod 3 is in the rising or falling motion, the chamfer structure on the limiting part 21 can avoid scratching with the side wall of the guide part 31, reducing the probability of wear.

[0034] A second arc-shaped chamfer 42 is provided between the bottom of the guide portion 31 and the contact surface of the guide portion 31 near the limiting portion 21. The second arc-shaped chamfer 42 is used to ensure that the guide portion 31 smoothly enters the contact surface of the limiting portion 21 when the stopper rod 3 descends, avoiding friction and jamming caused by the sharp angle of the guide portion 31 contacting the end face of the limiting portion 21. Similarly, a third arc-shaped chamfer 43 is provided between the top of the guide portion 31 and the contact surface of the guide portion 31 near the limiting portion 21. The third arc-shaped chamfer 43 is used to avoid friction and jamming caused by the sharp angle of the top edge of the guide portion 31 sliding contact with the end face of the limiting portion 21 when the stopper rod 3 rises.

[0035] Please see Figure 2 and Figure 4 As shown, the bottom blowing channel 5 extends from the top of the stopper rod 3 to the internal channel of the bottom guide section 31. After the inert gas is ejected from the nozzle of the guide section 31, it forms an annular bubble curtain above the nozzle 2, covering the throat area of ​​the nozzle 2 and inhibiting the deposition of inclusions such as Al2O3. The bubble curtain can reduce the probability of nodule formation on the nozzle 2, especially reducing the nodule formation rate in the flow channel 22. In addition, the bubbles can agitate the molten steel in the tundish 1, eliminate the temperature gradient in the tundish 1, and promote the homogeneous diffusion of alloying elements.

[0036] Further, please refer to Figures 2-4As shown, the guide part 31 includes a collar 311 and several guide blocks 312. The guide blocks 312 are arranged circumferentially along the collar 311, and the guide blocks 312 cooperate with the limiting part 21 to achieve guidance. The guide part 31 and the stopper rod 3 are designed separately, and the guide blocks 312 are fixed by being sleeved on the periphery of the stopper rod 3 through the collar 311. The micro-nozzles opened on the guide blocks 312 can inject inert gas into the molten steel in the tundish 1. The bottom blowing channel 5 is opened using the original solid space of the stopper rod 3 without adding external structure; the guide blocks 312 simultaneously perform the dual functions of mechanical guidance and gas injection.

[0037] The collar 311 and the stopper rod 3 can be integrally formed or subjected to an interference fit. With an integrally formed structure, there is no risk of slippage between the guide portion 31 and the stopper rod 3, but the complex internal gas passages increase the molding difficulty of the stopper rod 3. With an interference fit structure, the guide portion 31 and the stopper rod 3 can be manufactured separately, and the gas passages can be connected through subsequent fitting, significantly reducing the molding difficulty.

[0038] However, due to the uneven linear expansion that may occur between the guide portion 31 and the stopper rod 3 at high temperatures, the split design may cause the collar 311 to loosen, resulting in the collar 311 shifting relative to the stopper rod 3. Therefore, retaining rings 6 are provided at both ends of the guide portion 31. The retaining rings 6 and the stopper rod 3 can be reinforced with grooves to enhance the bonding strength and form an anti-slip limiting structure for the guide portion 31.

[0039] The inner wall of the collar 311 is machined inward to form an annular cavity-shaped gas collecting chamber 313. The open end of the gas collecting chamber 313 is connected to the bottom blowing channel 5, and circumferentially connected to the internal gas passages of each guide block 312. The gas collecting chamber 313 replaces the complex pipeline with an annular pressure stabilizing chamber, and reduces the deviation of gas flow output from each guide block 312 through the volume pressure stabilizing effect.

[0040] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A stopper rod tundish nozzle structure, characterized in that, include: Intermediate package (1); Water inlet (2), the water inlet (2) is located at the bottom of the intermediate tundish (1), and the water inlet (2) is provided with a plurality of limiting parts (21), and a flow passage (22) is formed between adjacent limiting parts (21); A stopper rod (3) is provided with a guide part (31) that contacts a plurality of limiting parts (21).

2. The tundish nozzle structure for a stopper rod according to claim 1, characterized in that, The limiting part (21) and the sprue (2) are integrally formed.

3. The tundish nozzle structure for a stopper rod according to claim 1, characterized in that, A first arc-shaped chamfer (41) is provided between the top of the limiting part (21) and the contact surface of the limiting part (21) near the guide part (31).

4. The tundish nozzle structure for a stopper rod according to claim 1, characterized in that, A second arc-shaped chamfer (42) is provided between the bottom of the guide portion (31) and the contact surface of the guide portion (31) near the limiting portion (21).

5. The tundish nozzle structure for a stopper rod according to claim 1, characterized in that, A third arc-shaped chamfer (43) is provided between the top of the guide portion (31) and the contact surface of the guide portion (31) near the limiting portion (21).

6. The tundish nozzle structure for a stopper rod according to claim 1, characterized in that, The stopper rod (3) has a bottom blowing channel (5) that extends to the guide part (31) and communicates with the inner cavity of the intermediate package (1) through the guide part (31).

7. The tundish nozzle structure for a stopper rod according to claim 6, characterized in that, The guide portion (31) includes a collar (311) and a plurality of guide blocks (312), the plurality of guide blocks (312) being arranged circumferentially along the collar (311).

8. The tundish nozzle structure for a stopper rod according to claim 7, characterized in that, The contact surfaces of the collar (311) and the stopper (3) are recessed inward to form a gas collecting cavity (313), and a plurality of the guide blocks (312) are connected to the bottom blowing channel (5) through the gas collecting cavity (313).

9. The tundish nozzle structure for a stopper rod according to claim 6, characterized in that, The guide part (31) is interference-fitted with the stopper rod (3).

10. The tundish nozzle structure for a stopper rod according to claim 9, characterized in that, Retaining rings (6) are provided between the two ends of the guide part (31) and the stopper rod (3).

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