Double-line hot rolling unit

Abstract

The double-line hot rolling unit comprises a thin slab unit, a rough rolling unit and a finish rolling unit, and the thin slab unit comprises a thin slab continuous casting machine, a fixed section tunnel furnace and a first movable unit which are sequentially arranged in a collinear mode; the rough rolling unit comprises a plate blank heating furnace, a rough rolling mechanism and a second movable unit, the rough rolling mechanism and the second movable unit are collinearly and sequentially arranged, the plate blank heating furnace is connected to the upstream of the rough rolling mechanism, and the second movable unit and the first movable unit are suitable for mutual movable response so that a steel billet can be transferred between two lines; the finish rolling unit is collinearly connected to the downstream of the sheet billet unit or the rough rolling unit, and a hot coil box is arranged on the inlet side of the finish rolling unit. According to the utility model, hot rolling production of thin slabs and conventional slabs can be realized, and the process flexibility is high; the hot coil box is arranged on the inlet side of the finish rolling unit, so that soaking and heat preservation can be carried out on rough rolling intermediate billets or thin billets, upstream and downstream production pace can be well coordinated, and it is guaranteed that the double-line hot rolling unit has good production stability and smoothness when the thin billets and conventional billets are treated.

Description

Technical Field

[0001] The utility model belongs to the technical field of hot rolling production, and in particular relates to a double-line hot rolling unit. Background Art

[0002] Continuous casting and rolling is a near-net-shape, short-process production process developed in the 1980s. Compared with conventional hot rolling, continuous casting and rolling has the advantages of high yield rate, large proportion of thin-gauge products, thinnest product specifications, high product dimensional accuracy, small unit footprint, low energy consumption per ton of steel, small exhaust gas emissions, small new water consumption, and low roller consumption. However, due to production process limitations, continuous casting and rolling production lines have great limitations in the production of high-performance steel grades such as ultra-deep drawing soft steel, high-grade non-oriented silicon steel, oriented silicon steel, and pipeline steel above X80; in addition, the output of continuous casting and rolling production lines is smaller than that of conventional hot rolling, resulting in high investment per ton of steel, and no obvious cost and energy consumption advantages.

[0003] Although the continuous casting line can be mechanically coupled with the conventional hot rolling line, the process differences between the two production lines result in poor coupling reliability, making it difficult to actually put them into production. Utility Model Content

[0004] The utility model relates to a double-line hot rolling mill group, which can at least solve some defects of the prior art.

[0005] The utility model relates to a double-line hot rolling mill group, comprising a thin slab unit, a rough rolling unit and a finishing rolling unit.

[0006] The thin slab unit comprises a thin slab continuous casting machine, a fixed section tunnel furnace and a first movable unit which are arranged in sequence in a co-linear manner;

[0007] The rough rolling unit comprises a slab heating furnace, a rough rolling mechanism and a second movable unit, the rough rolling mechanism and the second movable unit are arranged in sequence on the same line, the slab heating furnace is connected to the upstream of the rough rolling mechanism, and the second movable unit and the first movable unit are adapted to move in response to each other so as to transfer the steel slab between the two lines;

[0008] The finishing rolling unit is connected in line with the thin slab unit or the downstream of the rough rolling unit, and a hot coil box is arranged at the inlet side of the finishing rolling unit.

[0009] As one of the implementation modes, the finishing rolling unit is connected in line downstream of the rough rolling unit, and the hot coil box is connected adjacent to the finishing rolling unit and the second movable unit respectively.

[0010] As one of the implementation modes, both the first movable unit and the second movable unit are swing-type conveying units and are suitable for swing docking.

[0011] As one of the implementation manners, the first movable unit is a swinging tunnel furnace.

[0012] As one of the implementation manners, the second movable unit is a swinging heat preservation roller table.

[0013] As one of the implementation manners, both the first movable unit and the second movable unit are transverse transfer units; wherein, the first movable unit is adapted to move transversely to a side away from the rough rolling unit, and the second movable unit is adapted to move transversely between the thin slab unit and the rough rolling unit; or, the second movable unit is adapted to move transversely to a side away from the thin slab unit, and the first movable unit is adapted to move transversely between the thin slab unit and the rough rolling unit.

[0014] As one of the implementation manners, the first movable unit is a transverse section tunnel furnace.

[0015] As one of the implementation manners, the second movable unit is a transverse heat preservation roller table.

[0016] As one of the implementation manners, the transverse movement tracks of the first movable unit and the second movable unit are connected in series collinearly.

[0017] As one of the implementation manners, the rough rolling mechanism adopts a reversing mill.

[0018] The utility model has at least the following beneficial effects:

[0019] The utility model can realize the hot rolling production of thin slabs and conventional slabs, and has high process flexibility; by arranging a hot coil box on the inlet side of the finishing unit, not only can the rough rolling intermediate slab or the thin slab be heated and insulated evenly, but also the production pace of the upstream and downstream can be coordinated well, ensuring that the double-line hot rolling mill has good production stability and smoothness when processing thin slabs and conventional slabs. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of a swinging billet feeding type double-line hot rolling mill provided by an embodiment of the present utility model;

[0022] Figure 2 It is a schematic structural diagram of a transverse billet feeding type double-line hot rolling mill provided by an embodiment of the present utility model;

[0023] Figure 3Schematic diagram of the application status of a horizontal billet feeding type double - line hot rolling mill. Specific implementation mode

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] As Figures 1 - 3 , the embodiments of the present invention provide a double - line hot rolling mill, including a thin slab unit 1, a rough rolling unit 2 and a finish rolling unit 3.

[0026] The thin slab unit 1 includes a thin slab continuous caster 11, a fixed - section tunnel furnace 12 and a first movable unit arranged in sequence on the same line.

[0027] The rough rolling unit 2 includes a slab heating furnace 21, a rough rolling mechanism 22 and a second movable unit. The rough rolling mechanism 22 and the second movable unit are arranged in sequence on the same line. The slab heating furnace 21 is connected upstream of the rough rolling mechanism 22. The second movable unit and the first movable unit are adapted to move in response to each other to transfer the billet between the two lines.

[0028] The finish rolling unit 3 is connected in sequence on the same line downstream of the thin slab unit 1 or the rough rolling unit 2, and a hot coil box 4 is arranged on the inlet side of the finish rolling unit 3.

[0029] The above - mentioned rough rolling unit 2 is mainly used for performing rough rolling production of conventional slabs, for example, for processing medium - thick slabs with a thickness of 150 - 250 mm.

[0030] The above - mentioned slab heating furnace 21 is preferably a walking - beam heating furnace; one or more slab heating furnaces 21 can be arranged.

[0031] In one embodiment, the running direction of the slab in the slab reheating furnace 21 is parallel to the longitudinal direction of the rough rolling unit 2. Here, the longitudinal direction of the rough rolling unit 2, that is, the length direction of the rough rolling unit 2, corresponds to the running direction of the slab on the rough rolling unit 2. This layout can save the lateral space in the plant area (this lateral direction is perpendicular to the longitudinal direction of the rough rolling unit 2) and improve the compactness of the unit layout. Among them, the conveying direction of the discharge roller table of the slab reheating furnace 21 is perpendicular to the longitudinal direction of the rough rolling unit 2. This discharge roller table is preferably arranged outside the rough rolling unit 2. A turntable is arranged on the inlet side of the rough rolling unit 2 and is connected to the discharge roller table. This turntable is used to rotate the slab by 90° to ensure that the slab can continue to be transported on the rough rolling unit 2. Among them, the rough rolling mechanism 22 can be connected to the above turntable through the pre-rough rolling heat preservation roller table. Further, a descaling machine before rough rolling can be arranged in the above discharge roller table, and a width sizing machine can be arranged in the discharge roller table; when both a descaling machine before rough rolling and a width sizing machine are arranged, the width sizing machine is preferably arranged downstream of the descaling machine before rough rolling.

[0032] In another embodiment, as Figures 1 - 3 , the running direction of the slab in the slab reheating furnace 21 is perpendicular to the longitudinal direction of the rough rolling unit 2; for this layout, the discharge roller table 211 of the slab reheating furnace 21 can be arranged collinearly with the rough rolling mechanism 22, and the rough rolling unit can be connected to the discharge roller table 211 through the pre-rough rolling heat preservation roller table.

[0033] The above-mentioned rough rolling unit can include one or more rough rolling mills, preferably a reversible rolling mill. In one embodiment, the rough rolling unit includes two rough rolling mills arranged in series; in another embodiment, the rough rolling unit includes two rough rolling mills arranged at intervals and an intermediate heat preservation roller table is arranged between them.

[0034] In one embodiment, as Figure 1 , both the first movable unit and the second movable unit are swing-type conveying units and are suitable for swing docking. In this way, the thin slab unit 1 can swing and supply slabs to the rough rolling unit 2, or the rough rolling unit 2 can swing and supply slabs to the thin slab unit 1.

[0035] Preferably, the first movable unit is a swing section tunnel furnace 131. The temperature drop of the slab in the swing section tunnel furnace 131 is small, which is convenient for subsequent finish rolling production.

[0036] The above-mentioned second movable unit can be a swing-type tunnel furnace or a swing-type heat preservation roller table 231. Preferably, a swing-type heat preservation roller table 231 is adopted, which can effectively avoid accidents such as damage to furnace rolls, damage to furnace shells, and steel piling caused by repeated impacts of high-speed slabs on the swing-type tunnel furnace during the reversible rolling of the rough rolling mill. Using the swing-type heat preservation roller table 231 can better withstand this impact.

[0037] In another embodiment, Figure 2 and Figure 3 , the first movable unit and the second movable unit are both transverse conveying units, so that the thin slab unit 1 can be transversely moved to the rough rolling unit 2 to supply the slab, or the rough rolling unit 2 can be transversely moved to the thin slab unit 1 to supply the slab. The first movable unit is suitable for transversely moving to the side away from the rough rolling unit 2, and the second movable unit is suitable for transversely moving between the thin slab unit 1 and the rough rolling unit 2; or the second movable unit is suitable for transversely moving to the side away from the thin slab unit 1, and the first movable unit is suitable for transversely moving between the thin slab unit 1 and the rough rolling unit 2.

[0038] Preferably, the first movable unit is a transverse section tunnel furnace 132, and the temperature drop of the slab in the transverse section tunnel furnace 132 is small, which can facilitate subsequent finishing production.

[0039] The above-mentioned second movable unit can be a transverse tunnel furnace or a transverse insulation roller 232. It is preferred to use the transverse insulation roller 232, which can effectively avoid accidents such as damage to the furnace rollers, damage to the furnace shell, and steel piling caused by repeated impacts of the high-speed slab on the transverse tunnel furnace during reversible rolling of the roughing mill. The transverse insulation roller 232 can better withstand such impacts.

[0040] Among them, a set of transverse tracks can be arranged for the transverse movement of the first movable unit and the second movable unit. The guide stroke of the transverse track can meet the transverse movement requirements of the first movable unit and the second movable unit, that is, the transverse tracks of the first movable unit and the second movable unit are connected in series in the same line.

[0041] As a preference, Figures 1 - 3 , the finishing unit 3 is connected in line with the downstream of the roughing unit 2, and accordingly, the thin slab is transferred from the thin slab unit 1 to the roughing unit 2 through the mutual activity response between the second movable unit and the first movable unit. On the one hand, the roughing unit 2 and the finishing unit 3 are in line, which can facilitate the arrangement of the thin slab unit 1 and the roughing unit 2, and reduce the longitudinal space occupied by the unit to a certain extent; on the other hand, the movable tunnel furnace in the thin slab unit 1 is used to supply the roughing unit 2, which can effectively reduce the temperature drop of the thin slab.

[0042] Furthermore, as shown in the figure, the hot coil box 4 is adjacently connected to the finishing unit 3 and the second movable unit, respectively, so as to reduce unnecessary temperature drop of the slab.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-line hot rolling mill, characterized in that: It includes thin slab unit, rough rolling unit and finishing rolling unit. The thin slab unit comprises a thin slab continuous casting machine, a fixed section tunnel furnace and a first movable unit which are arranged in sequence in a co-linear manner; The rough rolling unit comprises a slab heating furnace, a rough rolling mechanism and a second movable unit, the rough rolling mechanism and the second movable unit are arranged in sequence on the same line, the slab heating furnace is connected to the upstream of the rough rolling mechanism, and the second movable unit and the first movable unit are adapted to move in response to each other so as to transfer the steel slab between the two lines; The finishing rolling unit is connected in line with the thin slab unit or the downstream of the rough rolling unit, and a hot coil box is arranged at the inlet side of the finishing rolling unit.

2. The double-line hot rolling mill according to claim 1, characterized in that: The finishing rolling unit is connected in line with the downstream of the rough rolling unit, and the hot coil box is connected adjacent to the finishing rolling unit and the second movable unit respectively.

3. The double-line hot rolling mill according to claim 1, characterized in that: The first movable unit and the second movable unit are both swing-type conveying units and are suitable for swing docking.

4. The double-line hot rolling mill according to claim 3, characterized in that: The first movable unit is a swing-type tunnel furnace.

5. The double-line hot rolling mill according to claim 3, characterized in that: The second movable unit is a swing-type heat-insulating roller conveyor.

6. The double-line hot rolling mill according to claim 1, characterized in that: The first movable unit and the second movable unit are both transverse conveying units; wherein the first movable unit is suitable for transverse movement toward the side away from the rough rolling unit, and the second movable unit is suitable for transverse movement between the thin slab unit and the rough rolling unit; or, the second movable unit is suitable for transverse movement toward the side away from the thin slab unit, and the first movable unit is suitable for transverse movement between the thin slab unit and the rough rolling unit.

7. The double-line hot rolling mill according to claim 6, characterized in that: The first movable unit is a transverse section tunnel furnace.

8. The double-line hot rolling mill according to claim 6, characterized in that: The second movable unit is a transversely movable heat-insulating roller.

9. The double-line hot rolling mill according to claim 6, characterized in that: The transverse tracks of the first movable unit and the second movable unit are connected in series in a colinear manner.

10. The double-line hot rolling mill according to claim 1, characterized in that: The rough rolling mechanism adopts a reversible rolling mill.

Images