Multi-roller fan-shaped section suitable for wide and flat billets and continuous casting machine

Abstract

The multi-roller fan-shaped section is installed between a tail section fan-shaped section and a withdrawal and straightening machine, the multi-roller fan-shaped section comprises an upper frame and a lower frame, free rollers are evenly distributed on the front portion and the rear portion of the upper frame and the lower frame along the line, and driving rollers are evenly distributed on the middle portions of the upper frame and the lower frame along the line. At least four pairs of free rollers on the upper frame and at least four pairs of free rollers on the lower frame are arranged in pairs, one or two pairs of driving rollers on the upper frame and one or two pairs of driving rollers on the lower frame are arranged in pairs, and all pairs of free rollers located on the front portion and one or two pairs of driving rollers are located on a basic arc-shaped path of the continuous casting machine. Clamping oil cylinders are distributed on the front portion and the rear portion of the upper frame, pressing oil cylinders are distributed in the middle of the upper frame, the clamping oil cylinders are used for driving the corresponding free rollers on the upper frame to ascend and descend, the pressing oil cylinders are used for driving the driving rollers on the upper frame to ascend and descend, all the driving rollers are provided with respective driving devices, and the driving devices are installed at one ends of the corresponding driving rollers. The drawing speed and the drawing force of the wide and flat billet continuous casting machine can be improved.

Description

Technical Field

[0001] The utility model belongs to the field of continuous casting, and particularly relates to a multi-roll segment applicable to wide and flat billets and a continuous caster. Background Art

[0002] A slab is defined as having a width-thickness ratio greater than 3. Slab continuous casting is a continuous steel casting technology with slabs as the main product. The casting section size of a conventional slab caster is a thickness of 150 - 250 mm and a width of 1000 - 1800 mm. The continuous casting slabs are mainly used for rolling flat plates such as thick plates, medium plates, thin plates, and strip coils. A small slab refers to a slab with a thickness of 125 - 200 mm and a width of 400 - 900 mm, which is a special billet type between rectangular billets and conventional slabs. Compared with rectangular billets, it has a larger width and a width-thickness ratio exceeding 2.0. Compared with traditional slabs, it has a thinner thickness and a narrower width. To show the difference, this billet type is usually called a wide and flat billet. With the development of the industry, the continuous casting billet type required for strip production has gradually changed from rectangular billets to wide and flat billets.

[0003] Due to the large width-thickness ratio of the slab, the unsolidified casting billet needs to be fully clamped to avoid bulging of the casting billet. Therefore, the length of the closely arranged clamping section of the casting billet should be greater than the liquid core length of the casting billet. Moreover, the thicker the casting billet, the faster the drawing speed, and the weaker the cooling, the greater the liquid core length. The liquid core length calculated based on the maximum drawing speed is the metallurgical length of the continuous caster. Therefore, increasing the drawing speed can improve the production performance of the continuous caster. For a traditional slab caster, to increase the drawing speed, it is necessary to extend the length of the closely arranged clamping section. Since the increase in the vertical section length of a straight-arc caster is limited, generally, the number of segments is increased to solve this problem. For a wide and flat billet caster, its closely arranged clamping section does not have an oil cylinder, and the thickness cannot be adjusted online. The required billet drawing force is provided by the straightening machine, and generally, full-solidification straightening is used. Therefore, the close arrangement clamping of the casting billet must end before the straightening point, and the maximum designed drawing speed is limited.

[0004] Currently, for a wide and flat billet caster, to increase the drawing speed as much as possible, it is necessary to extend the length of the closely arranged clamping section. Since the increase in the vertical section length of a straight-arc continuous caster is limited, generally, the method of increasing the basic arc radius is used to solve this problem. This method increases the height of the workshop and the one-time investment of the continuous caster, and the increased cost is relatively high. Content of the Utility Model

[0005] The purpose of the utility model is to provide a multi-roll segment applicable to wide and flat billets and a continuous caster including the above multi-roll segment. This multi-roll segment can increase the drawing speed and billet drawing force of the wide and flat billet caster, thereby improving the operation rate of the wide and flat billet caster.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A multi-roll segment applicable to wide and flat billets, installed between the last segment and the straightener, includes an upper frame and a lower frame. Free rolls are distributed at the front and rear parts along the line of the upper frame and the lower frame, and drive rolls are distributed in the middle parts. The free rolls on the upper frame and the free rolls on the lower frame are arranged in pairs and there are at least four pairs. The drive rolls on the upper frame and the drive rolls on the lower frame are arranged in pairs and there is one pair or two pairs. All pairs of free rolls and one pair or two pairs of drive rolls located at the front are on the basic arc path of the continuous caster. Clamping cylinders are distributed at the front and rear parts of the upper frame, and screw-down cylinders are distributed in the middle part. Each clamping cylinder is used to drive the corresponding free roll on the upper frame to lift and lower, and each screw-down cylinder is used to drive each drive roll on the upper frame to lift and lower. All drive rolls have their own drive devices, and the drive devices are installed at one end of the corresponding drive rolls.

[0008] Further, the drive device includes a motor and a speed reducer. The input end and the output end of the speed reducer are respectively connected to the motor and the drive roll.

[0009] Further, the drive devices corresponding to the two drive rolls of the same pair are respectively located on both sides of the multi-roll segment.

[0010] Further, the lower end of the screw-down cylinder is connected to the corresponding drive roll through a lifting beam.

[0011] Further, water receiving devices for connecting the secondary cooling water and gas are provided on both sides of the lower frame.

[0012] Further, the upper frame and the lower frame are connected by tie rods.

[0013] A continuous caster applicable to wide and flat billets includes a ladle turret, an intermediate tundish, a mold, a bending segment, segment I, segment II, segment III, the above-mentioned multi-roll segment applicable to wide and flat billets, a straightener, a flame cutting machine, and a roller table arranged in sequence. The mold is installed on a hydraulic vibration device.

[0014] Further, segment II and segment III are replaceable structures, and they are equipped with replacement guide rails for providing a moving path during replacement.

[0015] Further, the hydraulic vibration device is installed on a box girder.

[0016] Further, the straightener adopts a portal straightener.

[0017] The beneficial effects of the present utility model are:

[0018] This multi-roll segment can increase the drawing speed of the wide and flat billet continuous caster. On the one hand, each pair of free rolls at the front and rear and each pair of driving rolls in the middle can increase the clamping length of the continuous caster and achieve continuous straightening (when drawing the billet or feeding the dummy bar, the pressing cylinder drives the driving rolls to press down the billet or the dummy bar, and the clamping cylinder drives the free rolls to clamp the billet or the dummy bar). The specific number of free rolls is determined according to the required clamping length corresponding to the drawing speed level. On the other hand, using each pair of driving rolls can increase the billet drawing force, avoiding accidents such as lying billets caused by excessive cooling of each segment of the segment and the billet in the multi-roll segment during the hot replacement operation, thereby improving the operation rate of the wide and flat billet continuous caster and reducing the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a continuous caster suitable for wide and flat billets in an embodiment of the present invention.

[0020] Figure 2 is a front sectional view of a multi-roll segment suitable for wide and flat billets in an embodiment of the present invention.

[0021] Figure 3 is a top sectional view of a multi-roll segment suitable for wide and flat billets in an embodiment of the present invention.

[0022] Figure 4 is a side sectional view of a multi-roll segment suitable for wide and flat billets in an embodiment of the present invention.

[0023] In the figure:

[0024] 1, ladle; 2, ladle turntable; 3, tundish car; 4, tundish; 5, mold; 6, bending section; 7, hydraulic vibration device; 8, box girder; 910, segment I; 911, segment II; 912, segment III; 10, multi-roll segment; 11, straightening machine; 12, flame cutting machine; 13, dummy bar; 14, roller table; 15, replacement guide rail.

[0025] 10.1 clamping cylinder; 10.2, upper frame; 10.3, pressing cylinder; 10.4, lifting beam; 10.5, driving roll; 10.6, free roll; 10.7, lower frame; 10.8, tie rod; 10.9, reducer; 10.10, motor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present invention will be further described below with reference to the drawings and embodiments.

[0027] Embodiment 1

[0028] This embodiment discloses a multi-roll segment 10 suitable for wide and flat billets, as Figures 1 to 4As shown: It is installed between the last segment of the segment (i.e., segment III 912) and the straightener 11, and includes an upper frame 10.2 and a lower frame 10.7. Free rollers 10.6 are distributed at the front and rear parts along the upper frame 10.2 and the lower frame 10.7, and driving rollers 10.5 are distributed in the middle parts. The free rollers 10.6 on the upper frame 10.2 and the free rollers 10.6 on the lower frame 10.7 are arranged in pairs and there are at least four pairs. The driving rollers 10.5 on the upper frame 10.2 and the driving rollers 10.5 on the lower frame 10.7 are arranged in pairs and there is one or two pairs. All pairs of free rollers 10.6 and one or two pairs of driving rollers 10.5 located at the front part are on the basic arc path of the continuous casting machine. Clamping cylinders 10.1 are distributed at the front and rear parts of the upper frame 10.2, and screw-down cylinders 10.3 are distributed in the middle part. Each clamping cylinder 10.1 is used to drive the corresponding free roller 10.6 on the upper frame 10.2 to lift and lower, and each screw-down cylinder 10.3 is used to drive each driving roller 10.5 on the upper frame 10.2 to lift and lower. All driving rollers 10.5 have their own driving devices, and the driving devices are installed at one end of the corresponding driving rollers 10.5. This multi-roller segment 10 can increase the drawing speed of the wide and flat billet continuous casting machine. On the one hand, each pair of free rollers 10.6 at the front and rear parts and each pair of driving rollers 10.5 in the middle part can increase the clamping length of the continuous casting machine and achieve continuous straightening (when drawing the billet or feeding the dummy bar, the screw-down cylinder 10.3 drives the driving roller 10.5 to press down the billet or the dummy bar 13, and the clamping cylinder 10.1 drives the free roller 10.6 to clamp the billet or the dummy bar 13). The specific number of free rollers 10.6 is determined according to the required clamping length corresponding to the drawing speed level. On the other hand, using each pair of driving rollers 10.5 can increase the billet drawing force, avoiding accidents such as lying billets caused by excessive cooling of the billet in each segment (segment I 910, segment II 911, segment III 912) and the multi-roller segment 10 during the hot replacement operation. Thus, the operation rate of the wide and flat billet continuous casting machine is improved, and the labor intensity of workers is also reduced. This multi-roller segment is particularly suitable for the speed increase and upgrade transformation of old small slab casting machines.

[0029] Regarding the driving device, in this embodiment, preferably: As Figure 2 and Figure 3 shown, the driving device includes a motor 10.10 and a speed reducer 10.9. The input end and the output end of the speed reducer 10.9 are respectively connected to the motor 10.10 and the driving roller 10.5. The driving devices corresponding to the two driving rollers 10.5 of the same pair are respectively located on both sides of the multi-roller segment 10, which is convenient for maintenance and can also avoid unilateral eccentric loading of the straightener.

[0030] In this embodiment, preferably: As Figure 2 shown, the lower end of the screw-down cylinder 10.3 is connected to the corresponding driving roller 10.5 through a lifting beam 10.4; As Figure 2As shown, the upper frame 10.2 and the lower frame 10.7 are connected by a tie rod 10.8; water receiving devices for connecting the secondary cooling water and gas are provided on both sides of the lower frame 10.7.

[0031] Embodiment 2

[0032] This embodiment discloses a continuous casting machine applicable to wide and flat billets, as Figure 1 shown, including a ladle turret 2, an intermediate tundish 4, a mold 5, a bending section 6, a sector I section 910, a sector II section 911, a sector III section 912, the above-mentioned multi-roll sector section 10 applicable to wide and flat billets, a straightening machine 11, a flame cutting machine 12 and a roller table 13 arranged in sequence. The mold 5 is installed on a hydraulic vibration device 7.

[0033] In this embodiment, preferably: as Figure 1 shown, the sector II section 911 and the sector III section 912 are replaceable structures, and a replacement guide rail 15 for providing a moving path during replacement is provided for their cooperation; as Figure 1 shown, the hydraulic vibration device 7 is installed on a box girder 8; the straightening machine 11 adopts a portal straightening machine.

[0034] During operation: First, the dummy bar 13 is sent into the lower opening of the mold 5 through the roller table 14, the straightening machine 11, the multi-roll sector section 10, the sector III section 912, the sector II section 911, the sector I section 910, and the bending section 6. The ladle turret 2 positions the ladle 1 in place, and the intermediate tundish car 3 positions the intermediate tundish 4 in place; then, the liquid steel in the ladle 1 flows into the intermediate tundish 3 through the protective sleeve below it for buffering and purification, and then is injected into the mold 5 through the submerged nozzle. After primary cooling, a billet with a liquid core is formed. The billet undergoes continuous bending through the bending section 6, and then enters the sector I section 910, the sector II section 911, and the sector III section 912 in sequence for secondary cooling and then enters the multi-roll sector section 10 to be continuously straightened. The straightened billet is pulled out by the dummy bar 13 and the straightening machine 11. Finally, the flame cutting machine 12 cuts the billet into the required specified length to obtain the required qualified wide and flat billet.

[0035] The embodiments described above are some embodiments of this application, rather than all embodiments. The detailed description of the embodiments of this application is not intended to limit the scope of this application claimed, but merely represents the selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application.

Claims

1. A multi-roller sector suitable for wide flat slabs, characterized in that: It is installed between the last sector segment and the straightening machine, and comprises an upper frame and a lower frame. Free rollers are distributed along the front and rear parts of the upper frame and the lower frame, and driving rollers are distributed in the middle part. The free rollers on the upper frame and the free rollers on the lower frame are arranged in pairs and there are at least four pairs. The driving rollers on the upper frame and the driving rollers on the lower frame are arranged in pairs and there are one or two pairs. All pairs of free rollers and one or two pairs of driving rollers located in the front are on the basic arc path of the continuous casting machine. Clamping cylinders are distributed in the front and rear parts of the upper frame, and pressing cylinders are distributed in the middle part. Each clamping cylinder is used to drive the corresponding free roller on the upper frame to rise and fall, and each pressing cylinder is used to drive each driving roller on the upper frame to rise and fall. All driving rollers have their own driving devices, and the driving devices are installed at one end of the corresponding driving rollers.

2. The multi-roller segment suitable for wide slabs as claimed in claim 1, characterized in that: The driving device comprises a motor and a reducer, and an input end and an output end of the reducer are respectively connected to the motor and the driving roller.

3. A multi-roller sector suitable for wide slabs as claimed in claim 1 or 2, characterized in that: The driving devices corresponding to the two driving rollers of the same pair are respectively located on both sides of the multi-roller sector.

4. The multi-roller segment suitable for wide slabs according to claim 1, characterized in that: The lower end of the pressing cylinder is connected to the corresponding driving roller through a lifting beam.

5. The multi-roller segment suitable for wide slabs as claimed in claim 1, characterized in that: Water receiving devices for connecting the secondary cooling water gas are arranged on both sides of the lower frame.

6. The multi-roller segment suitable for wide slabs as claimed in claim 1, characterized in that: The upper frame and the lower frame are connected by a pull rod.

7. A continuous casting machine suitable for wide slabs, characterized in that: It includes a ladle turret, an intermediate tank, a crystallizer, a bending section, a fan-shaped section I, a fan-shaped section II, a fan-shaped section III, a multi-roller fan-shaped section suitable for wide flat billets as described in any one of claims 1 to 6, a straightening machine, a fire cutting machine and a roller table, and the crystallizer is installed on a hydraulic vibration device.

8. The continuous casting machine for wide slabs according to claim 7, characterized in that: The fan-shaped section II and the fan-shaped section III are replaceable structures, and the two are matched with a replacement guide rail for providing a moving path during replacement.

9. The continuous casting machine for wide slabs according to claim 7, characterized in that: The hydraulic vibration device is installed on the box beam.

10. The continuous casting machine for wide slabs according to claim 7, characterized in that: The tension and straightening machine adopts arch-type tension and straightening machine.

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