CN211803735U - Continuous casting machine for producing special-shaped blank - Google Patents

Abstract

The utility model provides a continuous casting machine for producing special-shaped billets. The continuous casting machine for producing special-shaped billets comprises: a ladle turntable, which is provided with a ladle; a tundish, which is arranged below the ladle turntable; The outlet of the crystallizer assembly is arranged below the intermediate tank, and the upper end inlet of the crystallizer assembly is connected with the lower end outlet of the intermediate tank; the sector-shaped section extends along the vertical direction and is arranged below the crystallizer assembly, and the upper end of the sector-shaped section It is connected with the outlet of the lower end of the crystallizer assembly; the tension leveling machine is arranged in the vertical direction and is located below the sector segment; the fire cutting machine and the oblique blanking system are arranged below the tension leveling machine. The device is arranged vertically, and the sector segments are arranged in the vertical direction, so that the billet is neither bent nor straightened, thereby reducing the cracks caused by the external force and reducing the straight arc. Cracks on the surface of the billet caused by the accumulation of water in the inner arc when the shaped or full arc continuous casting machine is casting the shaped billet.

Description

Continuous casting machines for the production of shaped billets

technical field

The utility model relates to the technical field of continuous casting equipment in the iron and steel metallurgy industry, in particular to a continuous casting machine for producing special-shaped billets.

Background technique

The special-shaped billet mold is different from the ordinary slab and square billet molds that only have four faces and four corners. The special-shaped billet mold has twelve faces and twelve corners, and it is difficult to guarantee the uniformity of cooling due to the complex shape. In the process of mold cooling and secondary cooling of the special-shaped billet shell, the heat transfer in each part of the cross section is uneven, which leads to the concentration of the billet stress, which is prone to surface longitudinal cracks, internal cracks at the flange ends and other billet quality. defect. At present, the conventional special-shaped billet is cast by a full arc continuous casting machine, with a maximum cross-section of 1024mm*390mm*120mm, that is, a single weight of 1.4t/m. For the production of ultra-large shaped blanks with a single weight of more than 2.0t/m, the corresponding matching pouring section size is mostly 1200mm*500mm*120mm. The Chinese Patent Publication No. CN107552750 introduces a multi-strand continuous casting machine and production method capable of producing super-large section special-shaped billets or slabs. The casting machine reduces the bending stress in the production process of the billet, but does not improve the straightening force of the billet. Under the action of thermal stress and straightening stress, the special-shaped billet steel with strong crack sensitivity is still It is easy to produce billet cracks. The method described in this patent has another disadvantage: due to the large section of the slab, the low casting speed of the casting machine, and the low surface temperature of the slab, the surface temperature of the arc blank head cast by the full arc shaped blank mold is low. It is lower, and the reaction force required for straightening the blank head is also huge. When the blank head passes through the first two tension levelers, the straightening is not achieved. The machine collides, and the tension leveler may be damaged in severe cases. The light ones will affect the production, and the heavy ones will cause the watering to stop. In addition, due to the low web and high flange characteristics of the special-shaped billet, when the straight arc or full arc continuous casting machine is produced, water will naturally accumulate in the inner arc of the special-shaped billet. Even if the secondary cooling water blowing device is used, it is sensitive to cracks. For steel grades, there will still be cracks on the surface of the cast slab due to stagnant water.

To sum up, the shortcomings of the current production of ultra-large section special-shaped blanks:

1. Using the traditional full arc continuous casting machine or straight arc continuous casting machine, the special-shaped billet is subjected to straightening stress and even bending stress in addition to thermal stress. Under the superposition of the above stresses, it is difficult to achieve crack sensitivity. The production of strong special-shaped billet steel grades.

2. Due to the shape characteristics of the special-shaped billet, when the straight arc continuous casting or the full-arc shaped billet continuous casting machine is produced, the inner arc of the special-shaped billet will accumulate water, resulting in uneven cooling of the billet, which will aggravate the crack-sensitive steel billet. generation of surface cracks.

3. Due to the large section of the casting billet, the low pulling speed of the casting machine, and the low surface temperature of the billet, the tensile straightening machine cannot straighten the arc billet head cast by the full arc mold, causing the billet billet head to collide and pull straightening. Machines, the light ones will affect the production, and the heavy ones will cause the watering to stop.

Utility model content

The utility model provides a continuous casting machine for producing special-shaped billets, so as to achieve the purpose of improving the quality of the casting billets.

The technical scheme adopted by the utility model to solve the technical problem is: a continuous casting machine for producing special-shaped billets, comprising: a ladle turntable, which is provided with a ladle; It is connected with the outlet of the ladle; the crystallizer assembly is arranged below the intermediate tank, and the upper inlet of the crystallizer assembly is connected with the lower end outlet of the intermediate tank; the sector segment extends along the vertical direction and is arranged below the crystallizer assembly, the sector segment The upper end of the mold is connected with the outlet of the lower end of the crystallizer assembly; the tension leveling machine is arranged in the vertical direction and is located below the sector segment; the flame cutting machine and the oblique blanking system are arranged below the tension leveling machine.

Further, the crystallizer assembly includes a crystallizer and a crystallizer vibration device, the crystallizer is connected to the outlet at the lower end of the intermediate tank, and the crystallizer vibration device is connected to the side wall of the crystallizer.

Further, the crystallizer has a wide surface and a narrow surface, the narrow surface is a straight plate structure, the wide surface is a convex structure, and the wide surface is provided with cooling water holes.

Further, the sector segment is sequentially provided with a first sector segment, a second sector segment and a third sector segment along the vertical downward direction, the axes of the first sector segment, the axis of the second sector segment and the axis of the third sector segment are the same. Wire.

Further, the first segment is provided with a close-packed clamp supported by eight sides, the second segment is provided with a close-pack clamp supported by four sides, and the third segment is provided with a close-pack clamp supported by two sides.

Further, the same side of the segment and the tension leveler is provided with a tension leveler and a segment replacement device.

Further, the continuous casting machine for producing special-shaped billets also includes: a dummy removal device, which is arranged between the tension leveler and the fire cutting machine, and is used to separate the dummy rod from the casting blank; the dummy rod storage device , which is arranged on one side of the de-ducking device and used to store the dummy bar.

Further, the inclined blank ejection system includes: an inclined blank ejection slideway, which is arranged obliquely with the horizontal direction, and the lower end of the oblique blank ejection slideway is placed under the flame cutting machine; It carries the billet cut by the fire cutting machine; the billet pinch roller and the billet discharge roller are arranged in the horizontal direction and connected with the upper end of the inclined billet exit slideway.

The beneficial effect of the present invention is that the overall device of the embodiment of the present invention is arranged vertically, and the sector segments are arranged in the vertical direction, so that the billet is neither bent nor straightened, thereby reducing the cost of the billet. The cracks caused by the external force can also reduce the surface cracks of the casting billet caused by the accumulation of water in the inner arc when the straight arc or full arc continuous casting machine casts the special-shaped billet, so as to achieve the purpose of improving the quality of the casting billet. It is suitable for the production of special-shaped billets with super large cross-sections, and is suitable for the production of crack-sensitive steel grades, and can also avoid the production problems caused by the head of the casting billet colliding with the tension leveler.

Description of drawings

The accompanying drawings forming a part of the present application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the structural schematic diagram of close-packed clamping in the first sector;

Fig. 3 is the structural schematic diagram of close-packed clamping in the second sector;

FIG. 4 is a schematic view of the structure of the close-packed clamping in the third sector segment.

Reference symbols in the figure: 1, ladle; 2, ladle turntable; 3, tundish; 4, mould; 5, mould vibration device; 6, first sector; 7, second sector; 8, pull Leveling machine and segment replacement device; 9. Tension leveling machine; 10. De-ducking device; 11. Dummy bar storage device; 12. Fire cutting machine; 15. Roller table for blanking; 16. The third sector.

Detailed ways

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in FIG. 1 , an embodiment of the present utility model provides a continuous casting machine for producing special-shaped billets, including a ladle turntable 2, a tundish 3, a mold assembly, a segment, a tension leveler 9, a fire cutting machine 12 and Inclined blanking system 13 . The ladle turntable 2 is provided with the ladle 1 . The tundish 3 is arranged below the ladle turntable 2 , and the upper end inlet of the tundish 3 is connected to the outlet of the ladle 1 . The crystallizer assembly is arranged below the intermediate tank 3 , and the upper inlet of the crystallizer assembly is connected to the lower end outlet of the intermediate tank 3 . The sector segment extends in the vertical direction and is arranged below the crystallizer assembly, and the upper end of the sector segment is connected with the outlet of the lower end of the crystallizer assembly. The tension leveler 9 is arranged in the vertical direction and is located below the sector. The flame cutting machine 12 and the oblique blanking system 13 are arranged below the tension leveler 9 .

The overall device of the embodiment of the utility model is arranged vertically, and the sector segments are arranged in the vertical direction, so that the slab is neither bent nor straightened, thereby reducing the cracks of the slab due to the external force. It can also reduce the surface cracks of the casting billet caused by the water accumulated in the inner arc when the straight arc or full arc continuous casting machine casts the special-shaped billet, so as to achieve the purpose of improving the quality of the casting billet. Therefore, this embodiment can not only produce special-shaped blanks with super large section, but also be suitable for producing crack-sensitive steel grades, and can also avoid the production problems caused by the head of the casting blanks colliding with the tension leveler. In addition, since the special-shaped billet market is relatively small, small-sized billets are mostly produced, and there is less market demand for large-sized billets, so up to now, there has been no vertical continuous casting machine with a super-large special-shaped billet section.

The crystallizer assembly includes a crystallizer 4 and a crystallizer vibration device 5. The crystallizer 4 is connected to the lower end outlet of the intermediate tank 3. The crystallizer 4 has a wide surface and a narrow surface, the narrow surface is a straight plate structure, and the wide surface is a convex structure, And the wide surface is provided with cooling water holes. The advantage of the crystallizer 4 is that the cooling efficiency of the crystallizer water hole is retained, and the ease of processing of the crystallizer water hole is realized.

Further, the crystallizer vibration device 5 is connected to the side wall of the crystallizer 4 . The crystallizer vibration device 5 is a full-plate spring hydraulic vibration, and the advantages of the crystallizer vibration device 5 are that it can realize online replacement of vibration formula, and can realize non-sinusoidal and other vibration modes.

As shown in FIG. 2 to FIG. 4 , the sector segments are sequentially provided with a first sector segment 6 , a second sector segment 7 and a third sector segment 16 along the vertical downward direction. The axis of the first sector segment 6 , the second sector segment The axis of 7 and the axis of the third sector 16 are collinear. Compared with the arc segment, this embodiment has the advantage of convenient centering.

Further, the first sector 6 is provided with a close-packed clamping supported by eight sides, which can prevent the inner side of the flange, the narrow surface and the web of the profiled blank from bulging. The second sector 7 is provided with a close-packed clamp supported on four sides, which can prevent the narrow surface and the web of the shaped blank from bulging. The third sector 16 is provided with close-packed clamps supported on both sides, which can prevent the bulging of the web of the profiled blank.

In the embodiment of the present utility model, a tension leveler and a segment replacement device 8 are provided on the same side of the segment and the tension leveler 9 . The tension leveling machine 9 is an independent frame, and the tension leveling machine and the sector replacement device 8 can be used to realize the lifting and maintenance of the tension leveling machine 9. At the same time, the rollers of the tension leveling machine 9 can use annular inner cooling rollers to achieve the best cooling effect. Purpose.

Preferably, the continuous casting machine for producing profiled billets further includes a dummy removal device 10 and a dummy bar storage device 11 . A dummy removing device 10 is arranged between the tension leveler 9 and the fire cutting machine 12 , and the dummy removing device 10 is used to separate the dummy bar from the slab. The dummy bar storage device 11 is arranged on one side of the de-ducking device 10 and is used for storing the dummy bar. In the embodiment of the present invention, the dummy bar storage device 11 uses a hoist to recover the dummy bar, so as to prepare for the next casting machine opening and pour it into the mold 4 by clamping by the tension leveler 9 .

As shown in FIG. 1 , the inclined billet unloading system 13 includes an inclined billet unloading chute, a billet connecting trolley, a billet pinch roll 14 and a billet unloading roller table 15 . The inclined billet exit slideway is inclined to the horizontal direction, and the lower end of the inclined billet exit slideway is placed under the fire cutting machine 12; ; The billet pinch roll 14 and the billet roll 15 are arranged in the horizontal direction and connected with the upper end of the inclined billet slideway.

When the billet starts to be cut, the billet receiving trolley in the inclined billet unloading system 13 will automatically follow the billet head of the fixed-length billet to prevent the fixed-length billet from slipping. When the fixed-length billet is cut, the billet trolley is driven to lift above the ground together with the billet by hoisting, and then the billet is output through the billet pinch roller 14 and the billet discharge roller table 15 .

It should be noted that the position of the torch of the flame cutting machine 12 can be adaptively adjusted according to the shape of the slab to ensure that the torch of the flame cutter 12 is within a suitable range from the surface of the special-shaped billet, thereby improving the cutting efficiency.

Further, the embodiment of the present invention is a vertical continuous casting machine, which can be configured with more than two flow channels. The advantage is that the billet is neither bent nor straightened, thereby reducing the cracking of the billet due to these two external forces. At the same time, the vertical continuous casting machine also reduces the water accumulation in the inner arc of the straight arc or full arc continuous casting machine casting the special-shaped billet, thereby reducing the surface cracks of the billet caused by uneven cooling of the inner arc of the special-shaped billet. Because the vertical continuous casting machine does not have an arc-shaped casting billet head, there is no billet tipping, and it also avoids the problem that the billet tip of the full-arc continuous casting machine collides with the tension leveling machine. In addition, the arrangement of multiple runners is suitable for the output requirements of different casting machines, and is also conducive to matching with converters of various tonnages.

The maximum section of the special-shaped blank that can be produced by the embodiment of the utility model is 1200mm*500mm*120mm, and the weight per meter is 2.0t/m. Steel grades include ordinary carbon steel (such as Q235), crack-sensitive alloy steel (such as weathering steel Q355NH), etc.

The utility model also provides a production method of the special-shaped blank, which adopts a continuous casting machine for producing the special-shaped blank to produce, and the production method of the special-shaped blank comprises the following steps:

Step 10, placing the ladle 1 containing the molten steel on the ladle turntable 2, and distributing the molten steel into the mold assembly through the intermediate tank 3;

Step 20, start the tension leveler 9 and the mold assembly, so that the slab and the dummy bar are cooled down through the sector in the vertical direction;

Step 30. Detach the slab from the dummy bar and recover the dummy bar;

Step 40 , starting the fire cutting machine to cut the slab, and transporting the cut slab to the set position through the oblique blanking system 13 .

Wherein, step 30 includes: separating the dummy bar from the casting billet through the dummy removing device 10 , and recovering and storing the dummy bar through the dummy bar storage device 11 .

This method can be used to produce special-shaped blanks with a single weight of rice greater than 2.0t/m. When working, the operation steps are as follows:

The ladle 1 holds the refined molten steel, and is hoisted to the receiving span by the crane, placed on the butterfly turntable, and rotated by the ladle turntable 2, so that the ladle 1 is stopped above the intermediate tank 3. The molten steel is distributed through the tundish 3 to the preform molds 4 of the individual streams. After the molten steel in the mold 4 is at an appropriate height, the tension leveler 9 starts to start, and starts with the tension leveler 9, and the mold vibration device 5 vibrates synchronously (the vibration frequency and amplitude of the mold vibration device 5 are determined according to the pulling speed, steel species and sections, which can be matched to different vibration schemes). The tension leveler 9 pulls out the dummy bar and the slab, during which the slab undergoes water spray cooling of the first sector 6, the second sector 7 and the third sector 16, and the sectors are clamped in different close-packed ways and gradually advance. During the period, the dummy bar is recovered by the dummy bar storage device 11 for use in the next pouring; when the dummy bar is pulled out from the tension leveler 9, the dummy bar is removed by the dummy bar device 10.

When the length of the slab meets the fixed-length requirements, start the flame cutting machine 12 for cutting. Because the thickness of the flange and the web is different, the cutting gun of the flame cutting machine 12 needs to adjust the position of the cutting gun according to the shape of the slab, which is different from that of the slab. The surface is kept at a suitable distance for efficient cutting of the slab. When the billet starts to be cut, the billet receiving trolley in the inclined billet ejecting system 13 will automatically follow the billet head of the fixed-length billet to prevent the fixed-length billet from slipping off. When the fixed-length billet is cut, the billet trolley is driven to lift above the ground together with the billet by hoisting, and then the billet is output through the billet pinch roller 14 and the billet discharge roller table 15 .

From the above description, it can be seen that the above-mentioned embodiments of the present utility model achieve the following technical effects:

The embodiment of the utility model can make the cast slab neither bend nor straighten, so as to reduce the cracks of the cast slab caused by the two external forces. It can also reduce the surface cracks of the casting billet caused by the water accumulated in the inner arc when the straight arc or full arc continuous casting machine casts the special-shaped billet, so the utility model is especially suitable for producing large-section crack-sensitive steel grades.

Since the embodiment of the present invention does not have an arc-shaped casting billet head, there is no billet tipping, and the problem of the billet tip tipping of the full-arc continuous casting machine colliding with the tension leveling machine is avoided.

In addition, the arrangement of multiple runners is suitable for the output requirements of different casting machines, and is also conducive to the matching of converters of various tonnages.

The above descriptions are only specific examples of the present invention, and cannot limit the scope of implementation of the present invention. Therefore, the replacement of the equivalent components thereof, or the equivalent changes and modifications made according to the scope of the patent protection of the present invention, shall still belong to the scope of the present invention. Scope covered by this patent. In addition, the technical features and technical features, the technical features and the technical solutions, and the technical solutions and the technical solutions can be freely combined and used in the present invention.

Claims (8)

1. a continuous casting machine for producing special-shaped billets, is characterized in that, comprising: The ladle turntable (2) is provided with the ladle (1); The tundish (3) is arranged below the ladle turntable (2), and the upper end inlet of the tundish (3) is connected to the outlet of the ladle (1); a crystallizer assembly, arranged below the intermediate tank (3), the upper inlet of the crystallizer assembly is connected to the lower end outlet of the intermediate tank (3); a sector segment, extending along the vertical direction and arranged below the crystallizer assembly, the upper end of the sector segment is connected to the outlet of the lower end of the crystallizer assembly; A tension leveler (9), arranged along the vertical direction and located below the sector; The fire cutting machine (12) and the oblique blanking system (13) are arranged below the tension leveler (9). 2. The continuous casting machine for producing special-shaped billets according to claim 1, wherein the mold assembly comprises a mold (4) and a mold vibration device (5), the mold (4) and the mold The lower end outlet of the intermediate tank (3) is connected, and the crystallizer vibration device (5) is connected to the side wall of the crystallizer (4). 3. The continuous casting machine for producing special-shaped billets according to claim 2, wherein the mold (4) has a wide surface and a narrow surface, the narrow surface is a straight plate-like structure, and the wide surface is convex shape structure, and the wide surface is provided with cooling water holes. 4 . The continuous casting machine for producing special-shaped billets according to claim 1 , wherein the segment is sequentially provided with a first segment (6), a second segment (7) and a vertical downward direction. 5 . For the third sector (16), the axis of the first sector (6), the axis of the second sector (7) and the axis of the third sector (16) are collinear. 5. The continuous casting machine for producing special-shaped billets according to claim 4, characterized in that the first segment (6) is provided with a close-packed clamping supported by eight sides, and the second segment (7) A close-packed clamp supported on four sides is provided, and the third sector (16) is provided with a close-pack clamp supported by two sides. 6. The continuous casting machine for producing special-shaped billets according to claim 1, characterized in that, a tension leveler and a segment replacement device (8) are provided on the same side of the segment and the tension leveler (9). . 7. The continuous casting machine for producing special-shaped billets according to claim 1, wherein the continuous casting machine for producing special-shaped billets further comprises: a dummy removal device (10), arranged between the tension leveler (9) and the fire cutting machine (12), the dummy removal device (10) is used to separate the dummy rod from the slab; A dummy bar storage device (11) is provided on one side of the de-ducking device (10) and used to store the dummy bar. 8. The continuous casting machine for producing special-shaped billets according to claim 1, wherein the oblique billet ejection system (13) comprises: The inclined billet slideway is arranged obliquely with the horizontal direction, and the lower end of the inclined billet slideway is placed below the fire cutting machine (12); A billet receiving trolley, which is slidably arranged on the inclined billet exit slideway and can carry the billet cut by the fire cutting machine (12); The billet pinch roll (14) and the billet discharge roll table (15) are arranged in the horizontal direction and are connected with the upper end of the inclined billet discharge slideway.

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