CN219357873U - Multi-flow narrow plate blank continuous casting production line - Google Patents

Abstract

The utility model belongs to the technical field of continuous casting, and relates to a multi-flow narrow plate blank continuous casting production line, wherein a middle tank is provided with at least two water gaps, and each water gap corresponds to a narrow plate blank continuous casting machine production line; the production line of the narrow plate blank continuous casting machine positioned at two sides comprises a crystallizer component, a close-packed roller clamping section, a sector section, a flame cutting machine and a dummy bar arranged on a roller way, which are sequentially arranged, and the rest production lines of the narrow plate blank continuous casting machine comprise the crystallizer component, the close-packed roller clamping section, a withdrawal and straightening machine, the flame cutting machine and the dummy bar arranged on the roller way, which are sequentially arranged; the upper driving roller and the lower driving roller of the sector section are connected with a driving device to realize blank pulling and straightening of the narrow plate blank, and a hydraulic cylinder for on-line adjustment of the roller gap of the sector section is arranged on the sector section. The utility model can realize the improvement of the drawing speed of the narrow slab continuous casting production line with smaller arc radius, thereby reducing the capital investment.

Description

Multi-flow narrow plate blank continuous casting production line

Technical Field

The utility model belongs to the technical field of continuous casting, and relates to a multi-flow narrow plate blank continuous casting production line.

Background

Narrow slabs are generally slabs having a thickness of 160mm to 200mm and a width of 500mm to 1000mm, and are a special type of slab between rectangular slabs and conventional slabs. Compared with the conventional slab, the slab has thinner thickness and narrower width; the width is larger than that of a rectangular blank, and the width-to-thickness ratio exceeds 2.5. In order to adapt to the faster and faster tapping rhythm of steelmaking, the thickness and width of the narrow slab gradually approach those of a conventional slab, and the number of streams of the narrow slab continuous casting machine is also increased. Along with the development of national economy in China, the narrow plate blank is gradually expanded to high-quality carbon structural steel, weather-resistant steel, stainless steel and other steel types, the requirement on the quality of a casting blank is also higher and higher, and when the steel types such as high-carbon steel, alloy steel and the like which are easy to generate center segregation are produced, a soft reduction process is required to be carried out at the solidification tail end of the casting blank.

However, the existing narrow plate billet continuous casting production line cannot carry out the casting blank solidification end soft reduction process, and because the width-to-thickness ratio of the narrow plate billet exceeds 2.5, the casting blank is easy to bulge and straighten cracks in the manufacturing process, the surface quality is difficult to ensure, and the continuous casting drawing speed of the existing narrow plate billet continuous casting production line cannot meet the increasingly developed production rhythm of a large converter. The Chinese patent with the application number of 201611226741.7 discloses a bar and wire rod and narrow-band rolling production line and a production method thereof, and according to the patent, the production method is characterized in that a casting blank produced by a continuous casting machine is a rectangular casting blank, the long side is 150-400 mm, the short side is 100-200 mm, the number of streams of the continuous casting machine is single stream or double stream, and although the problem of casting blank bulging is solved by using a close-packed roller, the problem of matching between continuous casting and steelmaking is not solved, and the faster and faster tapping rhythm of steelmaking cannot be satisfied; the Chinese patent with application number 201811376520.7 discloses a multi-flow straight arc wide slab caster production line, according to the patent, the production line is characterized in that the production line is provided with a multi-flow channel, the maximum pulling speed of the caster is improved by increasing the arc radius formed by encircling a plurality of fan-shaped roller sections, the caster still enters a straightening area after being completely solidified, although the matching problem of continuous casting and steelmaking is solved, the casting blank solidification end soft reduction cannot be implemented, the production line is not suitable for the production of steel types such as high carbon steel, alloy steel and the like which are easy to generate center segregation, and the increase of the arc radius causes the increase of investment and operation cost; the chinese patent with application number 202021646298.0 discloses a multi-flow straight arc casting blank continuous casting machine, according to the patent, the multi-flow straight arc casting blank continuous casting machine is characterized in that a multi-flow channel production line is arranged, and although the matching problem of continuous casting and steelmaking is solved, a cooling device is required to be arranged before a withdrawal and straightening machine, the continuous casting blank still enters a straightening region after being completely solidified, and the light reduction of the solidification tail end of the casting blank still cannot be implemented.

In summary, the existing narrow plate billet continuous casting production line cannot meet the production rhythm of increasingly developed large converters, a casting blank is easy to bulge and straighten cracks in the manufacturing process, the casting blank solidification tail end soft reduction process cannot be performed, the internal quality of the casting blank cannot be guaranteed, the production range of the narrow plate billet continuous casting production line is greatly limited, and the requirements of modern industrial production cannot be met.

Disclosure of Invention

In view of the above, the present utility model aims to provide a multi-flow narrow slab continuous casting production line, which can realize the improvement of the continuous casting drawing speed of multi-flow narrow slab with a smaller arc radius, and solve the problem that the soft reduction of the solidification tail end of a casting blank cannot be implemented, so that the production line meets the requirements of modern industrial production.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the multi-flow narrow plate blank continuous casting production line comprises a molten steel tank, a molten steel tank rotary table for carrying and supporting the molten steel tank, a middle tank below the molten steel tank, a middle tank truck for supporting and carrying the middle tank, and a narrow plate blank continuous casting machine production line connected with a water gap of the middle tank, wherein the middle tank is provided with at least two water gaps, and each water gap corresponds to a narrow plate blank continuous casting machine production line;

the production line of the narrow slab continuous casting machine comprises a crystallizer component, a close-packed roller clamping section, a sector section, a flame cutting machine and a dummy bar arranged on a roller way, wherein the crystallizer component, the close-packed roller clamping section, the sector section, the flame cutting machine and the dummy bar arranged on the roller way are sequentially arranged;

the upper driving roller and the lower driving roller of the sector section are connected with a driving device to realize blank pulling and straightening of the narrow plate blank, and a hydraulic cylinder for on-line adjustment of the roller gap of the sector section is arranged on the sector section.

Further, a second extraction guide for replacing the segment is provided in the radial direction of the segment.

Further, a first extraction guide rail for replacing the closely-spaced roller clamping sections is arranged in the arc direction of the closely-spaced roller clamping sections.

Further, the closely spaced roller holding section includes a vertical bending section disposed below the crystallizer and a plurality of arcuate sections disposed below the vertical bending section.

Further, the roll gap of the closely spaced roll clamping sections is a fixed roll gap.

Further, the radius of the arc formed by the plurality of arc segments is 8-10 m.

Further, the crystallizer assembly comprises a crystallizer and a crystallizer vibration device, wherein the crystallizer vibration device is arranged on the inner arc side and the outer arc side of the narrow plate blank through a supporting beam, and the crystallizer is fixed on the crystallizer vibration device.

The utility model has the beneficial effects that:

according to the multi-stream narrow plate blank continuous casting production line, the narrow plate blank continuous casting production lines on two sides are provided with the sector sections, so that a withdrawal straightening machine is replaced to draw and straighten casting blanks, the length of a clamping section of a close-packed roller is increased, the improvement of the continuous casting pulling speed of the multi-stream narrow plate blank can be realized with a smaller arc radius, the investment of a continuous casting machine in the foundation construction can be reduced, the light reduction of the solidification tail end of the narrow plate blank can be implemented, and the production steel type range of the multi-stream narrow plate blank continuous casting machine can be expanded, so that the requirements of modern industrial production are met.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objects and other advantages of the utility model may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.

Drawings

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in the following preferred detail with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of a narrow slab casting line on both sides in an embodiment;

FIG. 2 is a schematic view of a narrow slab casting line positioned in the middle in the embodiment;

fig. 3 is a schematic partial structure of a multi-flow narrow slab continuous casting line in an embodiment.

Reference numerals: the casting ladle comprises a casting ladle 1, a casting ladle turret 2, a tundish car 3, a tundish 4, a crystallizer 5, a crystallizer vibrating device 6, a supporting beam 7, a vertical bending section 8, a first arc section 9, a second arc section 10, a fan section 11, a first extraction guide rail 12, a second extraction guide rail 13, a flame cutting machine 14, a dummy bar 15, a roller table 16, a withdrawal straightening machine 17, a driving device 18 and a hydraulic cylinder 19.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present utility model by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.

Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the utility model; for the purpose of better illustrating embodiments of the utility model, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present utility model, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.

Example 1

Referring to fig. 1 to 3, the multi-flow narrow plate blank continuous casting production line comprises a molten steel tank 1, a molten steel tank rotary table 2 for carrying and supporting the molten steel tank 1, a tundish 4 positioned below the molten steel tank 1, a tundish car 3 for supporting and carrying the tundish 4, and a narrow plate blank continuous casting machine production line connected with a water gap of the tundish 4, wherein the tundish 4 is provided with at least two water gaps, and each water gap corresponds to a one-flow narrow plate blank continuous casting machine production line; the production line of the narrow plate blank continuous casting machine comprises a crystallizer component, a close-packed roller clamping section, a sector section 11, a flame cutting machine 14 and a dummy bar 15 arranged on a roller way 16 which are sequentially arranged, and the rest of production line of the narrow plate blank continuous casting machine comprises the crystallizer component, the close-packed roller clamping section, a withdrawal and straightening machine 17, the flame cutting machine 14 and the dummy bar 15 arranged on the roller way 16 which are sequentially arranged; the upper driving roller and the lower driving roller of the sector section 11 are connected with a driving device 18 to realize blank drawing and straightening of a narrow slab, and a hydraulic cylinder 19 for on-line adjustment of the roller gap of the sector section 11 is arranged on the sector section 11.

Specifically, the bottom of the intermediate tank 4 is provided with 4 water gaps, each water gap corresponds to a narrow slab production line, the crystallizer component comprises a crystallizer 5 and a crystallizer vibrating device 6, the crystallizer 5 is connected with the water gap of the intermediate tank 4, the crystallizer vibrating device 6 is arranged on the inner arc side and the outer arc side of a narrow slab through a supporting beam 7, and the crystallizer 5 is fixedly connected to the crystallizer vibrating device 6; the closely spaced roller clamping section comprises a vertical bending section 8 arranged below the crystallizer 5 and a plurality of arc sections arranged below the vertical bending section 8, wherein the arc sections comprise a first arc section 9 and a second arc section 10 which are sequentially connected, and the closely spaced roller clamping section is used for guiding and clamping a narrow slab and simultaneously conveying a dummy bar 15.

Further, the second extraction guide rail 13 for replacing the fan-shaped section 11 is arranged in the radial direction of the fan-shaped section 11, the first extraction guide rail 12 for replacing the closely-spaced roller clamping section is arranged in the arc direction of the closely-spaced roller clamping section, the roll gap of the closely-spaced roller clamping section is a fixed roll gap, the roll gap can be adjusted after the line is cut off, the number of spare parts of the closely-spaced roller clamping section is reduced, and therefore the running cost of a continuous casting machine is reduced, and the arc radius formed by surrounding the plurality of arc-shaped sections and the fan-shaped section 11 is 8-10 m.

Referring to fig. 3, which is a schematic diagram of a partial structure of a multi-stream narrow slab continuous casting line in the direction a in fig. 1 or fig. 2, the key of this embodiment is that, a withdrawal and straightening machine 17 located behind a clamping section of a close-packed roll on a side-stream narrow slab continuous casting line on both sides is replaced with a fan-shaped section 11, which is equivalent to increasing the clamping length of the close-packed roll, so that the withdrawal and straightening speed of a two-stream narrow slab continuous casting line on both sides is increased without increasing the arc radius of the continuous casting machine, and the yield of the multi-stream narrow slab is further increased, and the upper driving roller and the lower driving roller of the fan-shaped section 11 are both connected with a driving device 18 to realize the drawing and straightening of the narrow slab, and a hydraulic cylinder 19 for on-line adjusting the roll gap of the fan-shaped section 11 is provided on the fan-shaped section 11, so that the solidification end of the narrow slab is gently pressed while the withdrawal speed is increased, and the intermediate-stream narrow slab continuous casting line still adopts the withdrawal and straightening machine 17 to draw and straighten the slab, and the slab is also connected with the driving device outside.

The production flow of the multi-flow narrow plate blank continuous casting production line provided by the embodiment is as follows:

a. the production method of the two-flow narrow plate blank continuous casting production line positioned on two sides comprises the following steps: the dummy bar 15 sequentially passes through a roller way 16, a fan-shaped section 11, a second arc-shaped section 10, a first arc-shaped section 9 and a vertical bending section 8 to enter a crystallizer 5, liquid molten steel in a molten steel tank 1 flows into a tundish 4 through a long water gap, and then enters the crystallizer 5 through the water gap after being split, the casting blank with a liquid core is cooled to form a casting blank, the casting blank with the liquid core is continuously cooled through the vertical bending section 8, the first arc-shaped section 9, the second arc-shaped section 10 and the fan-shaped section 11, the casting blank with the liquid core is straightened in the fan-shaped section 11, the fan-shaped section 11 is pulled out through the dummy bar 15 after the casting blank is completely solidified, and the casting blank is cut into required fixed length by a flame cutter 14 to obtain a narrow plate blank;

b. the production method of the intermediate multi-flow narrow plate blank continuous casting production line comprises the following steps: the dummy bar 15 sequentially passes through a roller way 16, a withdrawal and straightening machine 17, a second arc-shaped section 10, a first arc-shaped section 9 and a vertical bending section 8 to enter a crystallizer 5, liquid molten steel in a molten steel tank 1 flows into a tundish 4 through a long water gap, flows into the crystallizer 5 through a submerged nozzle after being split, is cooled to form a casting blank with a liquid core, continuously cools the casting blank through the vertical bending section 8, the first arc-shaped section 9 and the second arc-shaped section 10, and enters the withdrawal and straightening machine 17 for straightening after the casting blank is completely solidified, the straightened casting blank is pulled out of the withdrawal and straightening machine 17 through the dummy bar 15, and a flame cutting machine 14 cuts the casting blank into required fixed-size lengths to obtain a narrow slab.

c. When the casting blank needs to be lightly pressed at the solidification end, only two narrow slab casting production lines positioned at two sides are used for production, and when the narrow slab does not need to be lightly pressed at the solidification end, any narrow slab casting production line or a plurality of narrow slab casting production lines can be used for production.

Because the width-thickness ratio of the narrow plate blank is larger than 2.5, the narrow plate blank needs to be clamped by a close-packed roller in the whole solidification process in order to prevent the casting blank from bulging to cause quality problems. In the embodiment, a four-stream narrow slab continuous casting production line with an arc radius of 8.5m is taken as an example for producing a narrow slab with a thickness of 180mm, wherein a two-stream narrow slab continuous casting production line on two sides adopts a sector section 11 to draw and straighten a casting blank, and a withdrawal and straightening machine 17 is adopted for carrying out withdrawal and straightening on the casting blank on two middle streams, so that the maximum withdrawal speeds of side streams and middle streams are tested; the maximum drawing speed of the narrow plate blank with the thickness of 180mm produced by the four-stream narrow plate blank continuous casting production line in the prior art is tested by taking the narrow plate blank with the thickness of 180mm as a comparison example, the drawing and straightening machine 17 is adopted in all narrow plate blank continuous casting production lines in the four-stream narrow plate blank continuous casting production line to draw and straighten casting blanks, and the average drawing speed of the embodiment and the arc radius corresponding to the four-stream narrow plate blank continuous casting production line in the prior art reaching the drawing speed are researched by the embodiment and the comparison example, and the results are shown in table 1.

TABLE 1

As can be seen from table 1, in the case that the average drawing speed is the same, compared with the conventional narrow slab continuous casting line in the prior art, the arc radius of the narrow slab continuous casting line in this embodiment can be reduced by 2m, and the drawing speed of the narrow slab continuous casting machine can be improved with a smaller arc radius.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present utility model, which is intended to be covered by the claims of the present utility model.

Claims (7)

1. The utility model provides a multi-stream narrow plate blank continuous casting production line, includes molten steel jar (1), delivery and bearing molten steel jar revolving platform (2) of molten steel jar (1), be located tundish (4) of molten steel jar (1) below, be used for the support delivery tundish car (3) of tundish (4), with narrow plate blank conticaster production line that the mouth of a river of tundish (4) meets, its characterized in that: the intermediate tank (4) is provided with at least two water gaps, and each water gap corresponds to a production line of a narrow plate blank continuous casting machine;

the two-stream narrow slab continuous casting machine production line positioned at two sides comprises a crystallizer component, a close-packed roller clamping section, a sector section (11), a flame cutter (14) and a dummy bar (15) arranged on a roller way (16) which are sequentially arranged, and the rest of the narrow slab continuous casting machine production lines comprise the crystallizer component, the close-packed roller clamping section, a withdrawal and straightening machine (17), the flame cutter (14) and the dummy bar (15) arranged on the roller way (16) which are sequentially arranged;

the upper driving roller and the lower driving roller of the sector section (11) are connected with a driving device to realize blank pulling and straightening of a narrow plate blank, and a hydraulic cylinder for online adjustment of the roller gap of the sector section (11) is arranged on the sector section (11).

2. A multi-stream narrow slab continuous casting line as claimed in claim 1 wherein: a second extraction guide (13) for changing the segment (11) is arranged in the radial direction of the segment (11).

3. A multi-stream narrow slab continuous casting line as claimed in claim 1 wherein: a first extraction guide rail (12) for replacing the clamping section of the closely-spaced roller is arranged in the arc direction of the clamping section of the closely-spaced roller.

4. A multi-stream narrow slab continuous casting line as claimed in claim 1 wherein: the closely spaced roller clamping section comprises a vertical bending section (8) arranged below the crystallizer (5) and a plurality of arc-shaped sections arranged below the vertical bending section (8).

5. A multi-stream narrow slab casting line as claimed in claim 4 wherein: the roll gap of the closely spaced roll clamping section is a fixed roll gap.

6. A multi-stream narrow slab casting line as claimed in claim 4 wherein: the radius of the arc formed by the plurality of arc segments is 8-10 m.

7. A multi-stream narrow slab continuous casting line as claimed in claim 1 wherein: the crystallizer (5) assembly comprises a crystallizer (5) and a crystallizer vibrating device (6), wherein the crystallizer vibrating device (6) is arranged on the inner arc side and the outer arc side of a narrow plate blank through a supporting beam (7), and the crystallizer (5) is fixed on the crystallizer vibrating device (6).