A tundish casting flow rate adjustable drainage mechanism and method thereof

Abstract

The present invention discloses a tundish casting flow rate adjustable drainage mechanism and its method. By setting an upper drainage hole, a lower drainage hole, a metal mesh, a lower sand cylinder and an upper sand cylinder, the lower sand cylinder and the upper sand cylinder can be fixed together to form an integral sand cylinder. The auxiliary drainage hole can support the drainage sand wrapped by a soft and non-sand-leaking metal mesh, facilitating its compaction. There is a protrusion at the top of the drainage sand, and the protrusion is higher than the upper surface of the upper sand cylinder. While simplifying the structure, it improves the fitting rate of the drainage sand wrapped by a soft and non-sand-leaking metal mesh to the nozzle, thereby avoiding nozzle blockage, improving the drainage effect of the drainage sand on molten steel, reducing blowing drainage, ensuring the smooth progress of the continuous casting process, driving the integral sand cylinder and the drainage sand inside it into the nozzle, improving the working environment when workers load the drainage sand, reducing the operation difficulty of loading, improving the accuracy and safety of workers' operations, and improving production quality.

Description

Technical Field

[0001] The present invention relates to the technical field of tundish nozzle drainage, and specifically provides a tundish casting flow adjustable drainage mechanism and method. Background Art

[0002] The large continuous casting process is a process of producing slab by solidifying molten steel. During the pouring operation, the tundish nozzle needs to be continuously opened and closed, and the discharge of molten steel is adjusted by a (sliding) nozzle or a stopper rod installed at the outlet of the tundish.

[0003] During the process of supplying molten steel in the tundish to the mold, alumina-type inclusions exist in the molten steel, and fine inclusions that are not removed by flotation adhere to the inner wall and the discharge port of the submerged nozzle connecting the tundish and the mold, becoming the source of submerged nozzle blockage. To overcome this problem, an inert gas such as argon is often supplied to the inner wall of the submerged nozzle to form bubbles to inhibit the adhesion of inclusions on the inner wall. Although it has the effect of reducing the adhesion of inclusions on the inner wall of the submerged nozzle to a certain extent, the inhibition of the adhesion of inclusions is limited by, for example, the cooling effect caused by the inert gas. Therefore, it is often used in combination with drainage sand at the nozzle. The molten steel is introduced into the mold through the submerged nozzle, and the drainage sand is the filling material for the steel nozzle at the bottom of the tundish. The sliding nozzle drainage sand is an amorphous refractory material filled in the upper nozzle of the sliding nozzle and the steel flow hole of the upper slide plate. At the start of pouring, it can make the molten steel in the tundish flow down smoothly.

[0004] Without drainage sand, the molten steel will directly enter the nozzle after entering the tundish, resulting in a decrease in the temperature of the molten steel in the nozzle, which is extremely easy to solidify at the nozzle and cause nozzle blockage, and the molten steel cannot flow out. In the existing technology, the sand bag is directly thrown into the nozzle from a high altitude manually. Moreover, the light is dim and the depth is deep at the nozzle, which makes it difficult to accurately throw the sand bag into the nozzle, resulting in low utilization rate of the drainage sand, high probability of nozzle blockage, and the drainage effect needs to be improved. Summary of the Invention

[0005] The purpose of the present invention is to provide a tundish casting flow adjustable drainage mechanism and method to solve the problems raised in the above background art.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A ladle casting flow adjustable drainage mechanism, including a ladle body, a nozzle is provided at the bottom of the ladle body, an upper sand cylinder and a lower sand cylinder located at the bottom end of the upper sand cylinder are provided on the inner wall of the nozzle, an installation groove is provided on the inner wall of the top of the nozzle, an installation shoulder adapted to the installation groove is provided on the outer wall of the top of the upper sand cylinder, a mating groove is provided on the inner wall of the top of the upper sand cylinder, a refractory elbow adapted to the inner wall of the upper sand cylinder is provided on the inner wall of the upper sand cylinder, a mating block placed on the mating groove is provided on the outer wall of the top of the refractory elbow, auxiliary drainage holes that are vertically connected are provided on the inner walls of the mating block, the upper sand cylinder and the lower sand cylinder, and bolts that are threadedly connected are provided on the inner walls of two relatively symmetric auxiliary drainage holes for connecting the upper sand cylinder, the lower sand cylinder and the refractory elbow together to prevent gaps from appearing between the three, and an argon blowing pipe is provided on the inner wall of the ladle body.

[0007] Further, an upper drainage hole for molten steel to flow downward is provided on the inner wall of the refractory elbow, and a lower drainage hole is provided on the inner wall of the lower sand cylinder.

[0008] Further, the lower drainage hole and the upper drainage hole communicate to form a drainage channel, drainage sand for draining molten steel is provided on the inner wall of the drainage channel, the drainage sand is wrapped by a soft metal mesh that does not leak sand, and the shape of the metal mesh is adapted to the drainage channel.

[0009] Further, the inlet end of the argon blowing pipe extends to the outside of the ladle body to form a gas flow channel, and the outlet end of the argon blowing pipe extends to the bottom of the nozzle to prevent steel from clogging.

[0010] Further, the upper sand cylinder is made of refractory mud material, the lower sand cylinder is made of refractory mud material, and the auxiliary drainage holes are provided with.

[0011] Further, the upper plane of the refractory elbow is flush with the inner bottom surface of the ladle body, and the bottom end of the lower sand cylinder extends to the outside of the ladle body.

[0012] Further, the radius of the top opening of the nozzle is greater than the radius of its bottom opening, and the radius of the bottom opening of the upper drainage hole is equal to the radius of the top opening of the lower drainage hole.

[0013] Further, the upper drainage hole is conical, and the installation shoulder, the installation groove, the mating groove, the mating block, the nozzle and the lower drainage hole are coaxial in the vertical direction.

[0014] Further, the dry bonding flexural strength of the refractory mud material is greater than 0.5 MPa, and the flexural strength after firing at 1500 °C is greater than 3 MPa.

[0015] A method for a ladle casting flow adjustable drainage mechanism is as follows:

[0016] Step 1: The refractory elbow is fired and connected to the upper sand cylinder. The upper sand cylinder is placed at the top of the lower sand cylinder. Then, align the upper drainage hole with the lower drainage hole, and also align the auxiliary drainage holes on the inner walls of the building block, the upper sand cylinder, and the lower sand cylinder vertically, so that the auxiliary drainage holes are connected vertically, and the upper drainage hole and the lower drainage hole are connected vertically to form a drainage channel.

[0017] Step 1: Insert several bolts in sequence to fix the lower sand cylinder and the upper sand cylinder together to form an integral sand cylinder.

[0018] Step 2: Put the drainage sand wrapped by a soft metal net that does not leak sand into the drainage channel. The upper diameter of the auxiliary drainage hole is large and the lower diameter is small, which can support the drainage sand wrapped by the soft metal net that does not leak sand, and compact it. There is a protrusion at the top of the drainage sand, and the protrusion is higher than the upper surface of the upper sand cylinder.

[0019] Step 3: Clean the water inlet. Symmetrically pass the external towing rope through the auxiliary drainage holes. Connect the external lifting device to the top of the towing rope, drive the integral sand cylinder into the water inlet, and the installation shoulder is seated in the installation groove so that the installation shoulder fits the installation groove.

[0020] Step 4: Pour high-temperature molten steel into the ladle body. After the water inlet is opened, accelerate the melting of the upper sand cylinder, the lower sand cylinder, the bolts, and the metal net. The drainage sand fills the water inlet, promoting the molten steel to flow out of the water inlet.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0022] By providing the upper drainage hole, the lower drainage hole, the metal net, the lower sand cylinder, and the upper sand cylinder, the present invention can fix the lower sand cylinder and the upper sand cylinder together to form an integral sand cylinder. The auxiliary drainage hole can support the drainage sand wrapped by the soft metal net that does not leak sand, which is convenient for compacting it. There is a protrusion at the top of the drainage sand, and the protrusion is higher than the upper surface of the upper sand cylinder. While simplifying the structure, it improves the fitting rate of the drainage sand wrapped by the soft metal net that does not leak sand to the water inlet, thereby avoiding blockage of the water inlet, improving the drainage effect of the drainage sand on the molten steel, reducing blowing drainage, ensuring the smooth progress of the continuous casting process. By providing the auxiliary drainage hole, the bolt, the installation groove, and the installation shoulder, the external towing rope can be symmetrically passed through the auxiliary drainage hole, and the external lifting device is connected to the top of the towing rope to drive the integral sand cylinder and the drainage sand inside it into the water inlet, improving the working environment of workers when loading the drainage sand, reducing the operation difficulty of loading, improving the accuracy and safety of workers' operations, and improving the production quality. Description of the Drawings

[0023] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0024] Figure 1 is the front view structural schematic diagram of the whole of the present invention;

[0025] Figure 2 is the front view structural schematic diagram of the nozzle in the present invention;

[0026] Figure 3 is the front view structural schematic diagram of a part of the present invention;

[0027] Figure 4 is the present invention Figure 3 partial enlarged view at position A therein;

[0028] In the figure: 1, ladle body; 2, nozzle; 3, upper sand cylinder; 4, lower sand cylinder; 5, installation groove; 6, installation shoulder; 7, mating groove; 8, mating block; 9, refractory elbow; 10, auxiliary drainage hole; 11, bolt; 12, argon blowing pipe; 13, upper drainage hole; 14, lower drainage hole; 15, drainage channel; 16, drainage sand; 17, wire mesh. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figures 1 - 4, the present invention provides a technical solution: a ladle casting flow adjustable drainage mechanism and method, including a ladle body 1, a nozzle 2 is provided at the bottom of the ladle body 1, an upper sand cylinder 3 and a lower sand cylinder 4 located at the bottom end of the upper sand cylinder 3 are provided on the inner wall of the nozzle 2, an installation groove 5 is provided on the inner wall of the top of the nozzle 2, an installation shoulder 6 adapted to the installation groove 5 is provided on the outer wall of the top of the upper sand cylinder 3, a latching groove 7 is provided on the inner wall of the top of the upper sand cylinder 3, a refractory elbow 9 adapted to it is provided on the inner wall of the upper sand cylinder 3, a latching block 8 placed on the latching groove 7 is provided on the outer wall of the top of the refractory elbow 9, auxiliary drainage holes 10 that are vertically connected are provided on the inner walls of the latching block 8, the upper sand cylinder 3 and the lower sand cylinder 4, and bolts 11 connected by threads are provided on the inner walls of two relatively symmetric auxiliary drainage holes 10 for connecting the upper sand cylinder 3, the lower sand cylinder 4 and the refractory elbow 9 together to prevent gaps from appearing between the three. An argon blowing pipe 12 is provided on the inner wall of the ladle body 1, an upper drainage hole 13 for molten steel to flow downward is provided on the inner wall of the refractory elbow 9, a lower drainage hole 14 is provided on the inner wall of the lower sand cylinder 4, the lower drainage hole 14 and the upper drainage hole 13 communicate to form a drainage channel 15, drainage sand 16 for draining molten steel is provided on the inner wall of the drainage channel 15, and the drainage sand 16 is wrapped by a soft metal mesh 17 that does not leak sand. The inlet end of the argon blowing pipe 12 extends to the outside of the ladle body 1 to form a gas flow channel, and the outlet end of the argon blowing pipe 12 extends to the bottom of the nozzle 2 to prevent steel tapping blockage. The upper sand cylinder 3 is made of refractory mud material, the lower sand cylinder 4 is made of refractory mud material, 6 auxiliary drainage holes 10 are provided, the upper plane of the refractory elbow 9 is flush with the inner bottom surface of the ladle body 1, the bottom end of the lower sand cylinder 4 extends to the outside of the ladle body 1, the top radius of the nozzle 2 is greater than its bottom radius, the bottom radius of the upper drainage hole 13 is equal to the top radius of the lower drainage hole 14, the upper drainage hole 13 is conical, the installation shoulder 6, the installation groove 5, the latching groove 7, the latching block 8, the nozzle 2 and the lower drainage hole 14 are coaxial in the vertical direction, and the dried bonding flexural strength of the refractory mud material is greater than 0.5 MPa, and the flexural strength after firing at 1500 °C is greater than 3 MPa.

[0031] A method for a ladle casting flow adjustable drainage mechanism is as follows:

[0032] Step 1: The refractory elbow 9 is fired and connected to the upper sand cylinder 3. The upper sand cylinder 3 is placed at the top end of the lower sand cylinder 4, then the upper drainage hole 13 is aligned with the lower drainage hole 14, and the auxiliary drainage holes 10 on the inner walls of the latching block 8, the upper sand cylinder 3 and the lower sand cylinder 4 are vertically aligned, so that the auxiliary drainage holes 10 are vertically connected, and the upper drainage hole 13 and the lower drainage hole 14 are vertically connected to form a drainage channel 15;

[0033] Step 1: Insert two bolts 11 in sequence to fix the lower sand cylinder 4 and the upper sand cylinder 3 together to form an integral sand cylinder;

[0034] Step 2: Put the diversion sand 16 wrapped by a soft and non-sand-leaking metal mesh 17 into the diversion channel 15. The upper diameter of the auxiliary diversion hole 10 is large and the lower diameter is small, which can support the diversion sand 16 wrapped by the soft and non-sand-leaking metal mesh 17 and compact it. There is a protrusion at the top of the diversion sand 16, and the protrusion is higher than the upper surface of the upper sand cylinder 3;

[0035] Step 3: Clean the water inlet 2, symmetrically pass the externally connected towing rope through the auxiliary diversion hole 10, connect the externally connected lifting device to the top of the towing rope, drive the integral sand cylinder into the water inlet 2, and the installation shoulder 6 is seated in the installation groove 5 so that the installation shoulder 6 fits with the installation groove 5;

[0036] Step 4: Add high-temperature molten steel into the ladle body 1. After the water inlet 2 is opened, the upper sand cylinder 3, the lower sand cylinder 4, the bolts 11, and the metal mesh 17 are melted at an accelerated rate, and the diversion sand 16 fills the water inlet 2, promoting the molten steel to flow out of the water inlet 2 and improving the diversion effect.

[0037] The working principle of the present invention:

[0038] Refer to the attached Figure 1 - attached Figure 4 By setting the upper diversion hole 13, the lower diversion hole 14, the metal mesh 17, the lower sand cylinder 4 and the upper sand cylinder 3, the lower sand cylinder 4 and the upper sand cylinder 3 can be fixed together to form an integral sand cylinder. The auxiliary diversion hole 10 can support the diversion sand 16 wrapped by the soft and non-sand-leaking metal mesh 17, which is convenient for compacting it. There is a protrusion at the top of the diversion sand 16, and the protrusion is higher than the upper surface of the upper sand cylinder 3. While simplifying the structure, the fitting rate of the diversion sand 16 wrapped by the soft and non-sand-leaking metal mesh 17 to the water inlet is improved, thereby avoiding the blockage of the water inlet, improving the diversion effect of the diversion sand 16 on the molten steel, reducing the blowing diversion, ensuring the smooth progress of the continuous casting process. By setting the auxiliary diversion hole 10, the bolts 11, the installation groove 5 and the installation shoulder 6, the externally connected towing rope can be symmetrically passed through the auxiliary diversion hole 10, and the externally connected lifting device is connected to the top of the towing rope to drive the integral sand cylinder and the diversion sand 16 inside it into the water inlet 2, improving the working environment of workers when loading the diversion sand 16, reducing the operation difficulty of loading, improving the accuracy and safety of workers' operation, and improving the production quality.

[0039] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for an adjustable ladle casting flow guiding mechanism. The adjustable ladle casting flow guiding mechanism includes a ladle body (1). A nozzle (2) is provided at the bottom of the ladle body (1). An upper sand cylinder (3) and a lower sand cylinder (4) located at the bottom end of the upper sand cylinder (3) are provided on the inner wall of the nozzle (2). An installation groove (5) is provided on the inner wall of the top of the nozzle (2). An installation shoulder (6) adapted to the installation groove (5) is provided on the outer wall of the top of the upper sand cylinder (3). A mating groove (7) is provided on the inner wall of the top of the upper sand cylinder (3). A refractory elbow (9) adapted to it is provided on the inner wall of the upper sand cylinder (3). A mating block (8) placed on the mating groove (7) is provided on the outer wall of the top of the refractory elbow (9). Auxiliary drainage holes (10) that are vertically connected are provided on the inner walls of the mating block (8), the upper sand cylinder (3), and the lower sand cylinder (4). Bolts (11) connected by threads are provided on the inner walls of two symmetrically arranged auxiliary drainage holes (10) for connecting the upper sand cylinder (3), the lower sand cylinder (4), and the refractory elbow (9) together to prevent gaps from appearing between the three. A blowing argon pipe (12) is provided on the inner wall of the ladle body (1); It is characterized in that: The method for the adjustable ladle casting flow guiding mechanism is as follows: Step 1: The refractory elbow (9) is fired and connected to the upper sand cylinder (3). The upper sand cylinder (3) is placed at the top end of the lower sand cylinder (4). Then, the upper drainage hole (13) is aligned with the lower drainage hole (14), and the auxiliary drainage holes (10) on the inner walls of the mating block (8), the upper sand cylinder (3), and the lower sand cylinder (4) are vertically aligned, so that the auxiliary drainage holes (10) are vertically connected, and the upper drainage hole (13) and the lower drainage hole (14) are vertically connected to form a drainage channel (15); Step 2: Two bolts (11) are sequentially inserted to fix the lower sand cylinder (4) and the upper sand cylinder (3) together to form an integral sand cylinder; Step 3: The drainage sand (16) wrapped by a soft and non - sand - leaking metal mesh (17) is put into the drainage channel (15). The upper diameter of the auxiliary drainage hole (10) is large and the lower diameter is small, which can support the drainage sand (16) wrapped by the soft and non - sand - leaking metal mesh (17) and compact it. A protrusion is left at the top end of the drainage sand (16), and the protrusion is higher than the upper surface of the upper sand cylinder (3); Step 4: The nozzle (2) is cleaned. The externally connected towing ropes are symmetrically passed through the auxiliary drainage holes (10). The externally connected lifting device is connected to the top of the towing ropes to drive the integral sand cylinder into the nozzle (2). The installation shoulder (6) is seated in the installation groove (5) so that the installation shoulder (6) fits with the installation groove (5); Step 5: High - temperature molten steel is added into the ladle body (1). After the nozzle (2) is opened, the upper sand cylinder (3), the lower sand cylinder (4), the bolts (11), and the metal mesh (17) are melted at an accelerated rate, and the drainage sand (16) fills the nozzle (2), promoting the molten steel to flow out of the nozzle (2) and improving the drainage effect.

2. According to the method for an adjustable ladle casting flow guiding mechanism described in claim 1, It is characterized in that: The inner wall of the refractory elbow (9) is provided with an upper drainage hole (13) for the molten steel to flow downward, and the inner wall of the lower sand cylinder (4) is provided with a lower drainage hole (14).

3. A method for an adjustable ladle casting flow guiding mechanism according to claim 1, characterized in that: The lower drainage hole (14) and the upper drainage hole (13) communicate to form a drainage channel (15). The inner wall of the drainage channel (15) is provided with drainage sand (16) for guiding the molten steel. The drainage sand (16) is wrapped by a soft metal mesh (17) that does not leak sand, and the outer shape of the metal mesh (17) is adapted to the drainage channel (15).

4. A method for an adjustable ladle casting flow guiding mechanism according to claim 1, characterized in that: The inlet end of the argon blowing pipe (12) extends to the outside of the ladle body (1) to form a gas flow channel, and the outlet end of the argon blowing pipe (12) extends to the bottom of the nozzle (2) to prevent steel discharge blockage.

5. A method for an adjustable ladle casting flow guiding mechanism according to claim 1, characterized in that: The upper sand cylinder (3) is made of refractory mud material, the lower sand cylinder (4) is made of refractory mud material, and there are 6 auxiliary drainage holes (10).

6. A method for an adjustable ladle casting flow guiding mechanism according to claim 1, characterized in that: The upper plane of the refractory elbow (9) is flush with the inner bottom surface of the ladle body (1), and the bottom end of the lower sand cylinder (4) extends to the outside of the ladle body (1).

7. A method for an adjustable ladle casting flow guiding mechanism according to claim 1, characterized in that: The top radius of the nozzle (2) is greater than its bottom radius, and the bottom radius of the upper drainage hole (13) is equal to the top radius of the lower drainage hole (14).

8. A method for an adjustable ladle casting flow guiding mechanism according to claim 1, characterized in that: The upper drainage hole (13) is conical, and the mounting shoulder (6), the mounting groove (5), the mating groove (7), the mating block (8), the nozzle (2) and the lower drainage hole (14) are coaxial in the vertical direction.

9. A method for an adjustable ladle casting flow guiding mechanism according to claim 5, characterized in that: The dried bonding flexural strength of the refractory mud material is greater than 0.5 MPa, and the fired flexural strength after burning at 1500 °C is greater than 3 MPa.

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