Slab hot continuous rolling production system

Abstract

The utility model relates to a slab hot continuous rolling production system which comprises a first production line, the first production line comprises a rough rolling unit and a finish rolling unit which are collinearly and sequentially arranged, a slab heating furnace is arranged beside the first production line, and the running direction of slabs in the slab heating furnace is parallel to the longitudinal direction of the first production line. A discharging roller way of the plate blank heating furnace is arranged outside the first production line, the conveying direction of the discharging roller way is perpendicular to the longitudinal direction of the first production line, a rotating disc used for rotating plate blanks by 90 degrees is arranged on the inlet side of the rough rolling unit, and the discharging roller way is connected with the rotating disc. In the utility model, the slab heating furnace and the first production line are arranged in parallel, so that the transverse space of a factory can be saved, and the layout compactness of the production line is improved.

Description

Technical Field

[0001] The utility model relates to a slab hot continuous rolling production system. Background Art

[0002] During conventional slab hot rolling, the continuously cast slab is generally heated in a slab heating furnace, and then rolled through a rolling line including a rough rolling unit and a finishing rolling unit, wherein the slab heating furnace is generally perpendicular to the rolling line, that is, the running direction of the slab in the slab heating furnace is perpendicular to the rolling line, and the rear roller of the slab heating furnace is connected with the front roller of the rough rolling unit; this method has the problem of large equipment space occupation, especially large lateral space.

[0003] In addition, 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. Although the CSP process can increase production by coupling two CSP lines, it still has problems such as large process limitations. Utility Model Content

[0004] The utility model relates to a slab hot continuous rolling production system, which can at least solve some defects of the prior art.

[0005] The utility model relates to a slab hot rolling production system, comprising a first production line, wherein the first production line comprises a co-linear rough rolling unit and a finishing rolling unit sequentially arranged, a slab heating furnace is arranged beside the first production line, the slabs in the slab heating furnace run in parallel to the longitudinal direction of the first production line, a furnace discharge roller of the slab heating furnace is arranged outside the first production line and the conveying direction is perpendicular to the longitudinal direction of the first production line, a turntable for rotating the slabs by 90° is arranged at the inlet side of the rough rolling unit, and the furnace discharge roller is connected with the turntable.

[0006] As one of the implementation modes, the rough rolling unit includes a rough rolling mill group and a pre-rough rolling heat preservation roller conveyor arranged upstream of the rough rolling mill group, and the pre-rough rolling heat preservation roller conveyor is connected to the turntable.

[0007] As one of the implementation modes, the roughing mill group includes two roughing mills, and the two roughing mills are arranged in series.

[0008] As one of the implementation modes, the rough rolling mill group includes two rough rolling mills, the two rough rolling mills are arranged at an interval and an intermediate heat-insulating roller table is provided between the two rough rolling mills.

[0009] As one of the implementation modes, the rough rolling unit adopts a reversible rolling mill.

[0010] As one of the embodiments, the slab hot rolling production system also includes a second production line, which is arranged in parallel with the first production line; the second production line includes a thin slab continuous casting machine, a fixed section tunnel furnace and a movable billet supply unit arranged in sequence in the same line; the first production line also includes an active response unit for responding to the movable billet supply unit to complete the transfer of the thin slab to the first production line, and the active response unit is arranged between the rough rolling unit and the finishing rolling unit.

[0011] As one of the implementation modes, the movable blank supply unit is a swing section tunnel furnace, the movable response unit is a swing section heat preservation roller, and the swing section heat preservation roller is suitable for swinging and docking with the swing section tunnel furnace.

[0012] As one of the embodiments, the movable blank supply unit is a transverse moving section tunnel furnace, and the movable response unit is a transverse moving section insulation roller, wherein the transverse moving section insulation roller is suitable for transverse movement to the side away from the second production line, and the transverse moving section tunnel furnace is suitable for transverse movement between the second production line and the first production line.

[0013] The utility model has at least the following beneficial effects:

[0014] In the utility model, the slab heating furnace is arranged in parallel with the first production line. This arrangement can save the horizontal space of the plant and improve the compactness of the production line layout.

[0015] The utility model further has the following beneficial effects:

[0016] In the utility model, the first production line can complete the hot rolling production of conventional slabs, and the second production line can complete the production of thin slabs. The two production lines share a finishing unit, so the coupled production of thin slabs and conventional slabs can be achieved, with high process flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a slab hot rolling production system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1 The utility model provides a slab hot rolling production system, including a first production line, wherein the first production line includes a rough rolling unit and a finishing rolling unit 3 which are arranged in sequence in the same line, a slab heating furnace 21 is arranged next to the first production line, the slab running direction in the slab heating furnace 21 is parallel to the longitudinal direction of the first production line, the discharge roller of the slab heating furnace 21 is arranged outside the first production line and the conveying direction is perpendicular to the longitudinal direction of the first production line, and a turntable 24 for rotating the slab 90° is arranged on the inlet side of the rough rolling unit, and the discharge roller is connected with the turntable 24.

[0021] The first production line can perform hot rolling production of conventional slabs, for example, for processing medium-thick slabs with a thickness of 150 to 250 mm.

[0022] The slab heating furnace 21 is preferably a walking beam heating furnace.

[0023] The above-mentioned slab heating furnace 21 can be arranged in one or more units; when there are multiple slab heating furnaces 21, each slab heating furnace 21 can share a set of furnace discharge rollers, which can further reduce the space occupied by the production line.

[0024] The longitudinal direction of the first production line, that is, the length direction of the first production line, corresponds to the running direction of the slabs on the first production line.

[0025] In this embodiment, the slab heating furnace 21 is arranged in parallel with the first production line. This arrangement can save the horizontal space of the factory (the horizontal direction is perpendicular to the vertical direction of the first production line) and improve the compactness of the production line layout.

[0026] In one of the embodiments, a descaling machine 22 before rough rolling can be arranged in the above-mentioned discharge roller, and a width setting machine 23 can be arranged in the discharge roller; when the descaling machine 22 before rough rolling and the width setting machine 23 are arranged at the same time, the width setting machine 23 is preferably arranged downstream of the descaling machine 22 before rough rolling.

[0027] Preferably, if Figure 1 The rough rolling unit includes a rough rolling mill group 25 and a pre-rough rolling heat preservation roller arranged upstream of the rough rolling mill group 25, and the pre-rough rolling heat preservation roller is connected to the turntable 24.

[0028] The roughing mill group 25 may include one or more roughing mills, preferably a reversible mill. In one embodiment, the roughing mill group 25 includes two roughing mills, which are arranged in series; in another embodiment, the roughing mill group 25 includes two roughing mills, which are arranged at intervals and an intermediate heat-insulating roller is provided between the two roughing mills.

[0029] More preferably, if Figure 1 The slab hot rolling production system also includes a second production line, which is arranged in parallel with the first production line; the second production line includes a thin slab continuous casting machine 11, a fixed section tunnel furnace 12 and a movable billet supply unit arranged in sequence in the same line; the first production line also includes an active response unit for responding to the active billet supply unit to complete the transfer of the thin slab to the first production line, and the active response unit is arranged between the rough rolling unit and the finishing rolling unit 3.

[0030] Based on the above solution, the second production line can share the finishing unit 3 with the first production line, effectively reducing equipment investment and operating costs.

[0031] In one embodiment, if Figure 1 The movable billet supply unit is a swing-section tunnel furnace 13, and the movable response unit is a swing-section insulation roller 26. The swing-section insulation roller 26 is suitable for swinging and docking with the swing-section tunnel furnace 13; in this way, the second production line can swing to supply billets to the first production line, and the temperature drop of thin slabs in the swing-section tunnel furnace 13 is small, which can be convenient for subsequent finishing production; and the use of the swing-section insulation roller 26 in the first production line can effectively avoid the high-speed slab repeatedly impacting the A-line swing-section tunnel furnace 13 during the reversible rolling of the roughing mill, thereby causing damage to the furnace roller, damage to the furnace shell, steel piling and other accidents. The use of the swing-section insulation roller 26 can better withstand such impact.

[0032] Furthermore, if Figure 1, a fixed section insulation unit 27 is also arranged on the first production line, and the fixed section insulation unit 27 is arranged between the active response unit and the finishing unit 3. In one embodiment, the fixed section insulation unit 27 can be a fixed tunnel furnace, which is far away from the roughing mill, and the repeated impact of the reversible rolling of the roughing mill is not easy to be transmitted there, and the slab speed here is low, and the impact on the furnace roller is small, so the life of the fixed tunnel furnace can be guaranteed. In another embodiment, the fixed section insulation unit 27 is a fixed section insulation roller; in this case, the thin slab will cause a relatively large temperature drop loss of the thin slab due to the long transportation distance (a temperature drop of ~100°C may be generated). Based on this, a pre-finishing heating unit can be set between the fixed section insulation roller and the finishing unit 3 to supplement the heat of the slab, which is beneficial to the subsequent finishing production, wherein the pre-finishing heating unit includes but is not limited to the use of an induction heater.

[0033] In one embodiment, the movable blank supply unit is a transverse moving section tunnel furnace, and the movable response unit is a transverse moving section heat preservation roller, wherein the transverse moving section heat preservation roller is suitable for transverse movement to a side away from the second production line, and the transverse moving section tunnel furnace is suitable for transverse movement between the second production line and the first production line. In this way, the second production line can be transversely moved to the first production line to supply blanks.

[0034] After the heat-insulating roller in the transverse section moves to the side away from the second production line, a space for avoiding can be reserved, so that the tunnel furnace in the transverse section can move to the first production line to complete the transverse feeding of thin slabs. In this transverse feeding scheme, since the thin slabs are always transferred in the tunnel furnace and can directly enter the finishing unit 3 in the next step, the temperature loss of the thin slabs is small, which is beneficial to the subsequent finishing production.

[0035] Among them, a set of transverse tracks can be arranged for the transverse section insulation roller and the transverse section tunnel furnace to move transversely, and the guide stroke of the transverse track can meet the transverse movement requirements of the transverse section insulation roller and the transverse section tunnel furnace.

[0036] Preferably, the rough rolling unit comprises a rough rolling mill group 25 and a post-rough rolling heat preservation roller conveyor arranged downstream of the rough rolling mill group 25, and the post-rough rolling heat preservation roller conveyor is connected to the active response unit.

[0037] 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 slab hot rolling production system, comprising a first production line, wherein the first production line comprises a co-linearly arranged rough rolling unit and a finishing rolling unit, characterized in that: A slab heating furnace is provided next to the first production line. The running direction of the slabs in the slab heating furnace is parallel to the longitudinal direction of the first production line. The discharge roller of the slab heating furnace is arranged outside the first production line and the conveying direction is perpendicular to the longitudinal direction of the first production line. A turntable for rotating the slab 90° is arranged on the inlet side of the rough rolling unit, and the discharge roller is connected to the turntable.

2. The slab hot rolling production system according to claim 1, characterized in that: The rough rolling unit comprises a rough rolling mill group and a pre-rough rolling heat preservation roller table arranged upstream of the rough rolling mill group, and the pre-rough rolling heat preservation roller table is connected with the turntable.

3. The slab hot rolling production system according to claim 2, characterized in that: The roughing mill group comprises two roughing mills, and the two roughing mills are arranged in series.

4. The slab hot rolling production system according to claim 2, characterized in that: The rough rolling mill group comprises two rough rolling mills, which are arranged at an interval and an intermediate heat-insulating roller table is arranged between the two rough rolling mills.

5. The slab hot rolling production system according to claim 1, characterized in that: The rough rolling unit adopts a reversible rolling mill.

6. The slab hot rolling production system according to any one of claims 1 to 5, characterized in that: It also includes a second production line, which is arranged in parallel with the first production line; the second production line includes a thin slab continuous casting machine, a fixed section tunnel furnace and a movable billet supply unit arranged in sequence on the same line; the first production line also includes an active response unit for responding to the movable billet supply unit to complete the transfer of the thin slab to the first production line, and the active response unit is arranged between the rough rolling unit and the finishing rolling unit.

7. The slab hot rolling production system according to claim 6, characterized in that: The movable blank supply unit is a swing section tunnel furnace, and the movable response unit is a swing section heat preservation roller, and the swing section heat preservation roller is suitable for swinging and docking with the swing section tunnel furnace.

8. The slab hot rolling production system according to claim 6, characterized in that: The movable blank supply unit is a transverse moving section tunnel furnace, and the movable response unit is a transverse moving section insulation roller, wherein the transverse moving section insulation roller is suitable for transverse movement to the side away from the second production line, and the transverse moving section tunnel furnace is suitable for transverse movement between the second production line and the first production line.

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