Low-carbon Nb-containing steel belt production device and production process

Abstract

The invention discloses a low-carbon Nb-containing steel belt production device and a production process, and relates to the technical field of steel belt casting, the steel belt production device comprises a frame, a rotary tower and a steel ladle, the rotary tower is rotatably connected with the frame, and the steel ladle is fixedly connected with the rotary tower; an intermediate tank, a crystallizer, a cooler, a guide mechanism and a cutter are sequentially arranged on the frame in the flowing direction of molten steel, an outlet of the steel ladle is communicated with the intermediate tank, an outlet of the intermediate tank is communicated with the crystallizer, and an outlet of the crystallizer faces the guide mechanism; when a steel strip is cast, molten steel in a steel ladle flows into the intermediate tank, the intermediate tank can control the flow speed of the molten steel, so that the molten steel flows into the crystallizer at a stable flow speed, the crystallizer receives the molten steel injected from the intermediate tank and enables the molten steel to be solidified into a firm blank shell according to a specified section shape, and then the steel strip is cooled through the cooler; and the steel belt is conveyed through the guide mechanism, and finally the produced steel belt is cut and coiled through the cutter.

Description

Technical Field

[0001] The present invention relates to the technical field of steel strip casting, in particular to a production device and a production process for a low-carbon Nb-containing steel strip. Background Art

[0002] Twin-roll thin strip casting is a revolutionary continuous casting technology that directly solidifies liquid metal into thin strip, eliminating the multiple steps of traditional continuous casting and hot rolling. It is characterized by high efficiency, energy saving and a short process. Liquid steel is injected into the roll gap between two counter-rotating water-cooled copper rolls (or steel rolls) through a tundish. It is rapidly cooled and solidified by the roll surface, forming a continuous strip with a thickness of 1-5 mm and a width of up to 2000 mm.

[0003] However, during the transportation process, the steel strip will form depressions on the surface due to the squeezing and collision of the mechanism, and during the cooling process, as the oxide layer falls off, defects will appear on the surface of the steel strip, resulting in uneven surface of the steel strip, and the flatness of the steel strip surface cannot be guaranteed. Summary of the Invention

[0004] The object of the present invention is to provide a low-carbon Nb-containing steel strip production device and production process to solve the problems raised in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: the steel strip production device includes a frame, a rotary tower and a ladle, the rotary tower is rotatably connected to the frame, the ladle is tightly connected to the rotary tower, and an intermediate tank, a crystallizer, a cooler, a guide mechanism and a cutter are arranged in sequence on the frame along the flow direction of the molten steel. The outlet of the ladle is connected to the intermediate tank, the outlet of the intermediate tank is connected to the crystallizer, and the outlet of the crystallizer is toward the guide mechanism.

[0006] The frame is fixed on the ground to provide stable support for each component. Two ladles are symmetrically arranged on the slewing tower, and the slewing tower can rotate freely on the frame, thereby realizing the continuous supply of molten steel. When the steel strip is cast, the molten steel in the ladle flows into the tundish. The tundish can control the flow rate of the molten steel so that the molten steel flows into the crystallizer at a stable flow rate. The crystallizer receives the molten steel injected from the tundish and solidifies it into a solid shell according to the specified cross-sectional shape. The steel strip is then cooled by the cooler and transported by the guiding mechanism. Finally, the produced steel strip is cut and rolled by the cutter.

[0007] Furthermore, the guiding mechanism includes a supporting assembly and an adjusting assembly, wherein the supporting assembly is used to pull the formed steel strip, and the adjusting assembly is used to improve the surface quality of the steel strip.

[0008] When the solidified molten steel flows out of the crystallizer, the steel strip is relatively hot and soft. In order to prevent the steel strip from deviating during transportation, the support component is used to guide and pull the steel strip. In addition, the soft steel strip may form depressions on the surface due to the squeezing and collision of the mechanism during transportation, and the shedding of the oxide layer during the cooling process may also cause defects on the steel strip surface. The defects on the steel strip surface can be improved by adjusting the component.

[0009] Furthermore, the adjustment component includes a fixed frame, a detection roller, an adjustment roller, a push rod and a slider. The fixed frame is tightly connected to the frame, the rotating shaft of the detection roller is rotatably connected to the fixed frame, the push rod is tightly connected to the frame, the output end of the push rod is tightly connected to the slider, a slide groove is provided on the fixed frame, the slider is slidably connected to the slide groove, and the rotating shaft of the adjustment roller is rotatably connected to the slider.

[0010] The fixed frame is fixed on the frame to provide support for the adjustment component. In the initial state, the gap between the detection roller and the adjusting roller is consistent with the standard thickness of the steel belt. The steel belt passes through the gap between the detection roller and the adjusting roller at a certain speed. Under the action of friction, the steel belt will drive the detection roller and the adjusting roller to rotate. When a depression appears on the surface of the steel belt, the contact area between the depression and the detection roller is reduced, thereby causing the friction of the steel belt on the detection roller at the depression to decrease. By detecting the size of the friction between the steel belt and the detection roller, the size of the depression on the steel belt surface can be judged, that is, the smaller the friction between the steel belt and the detection roller, the larger the range of the surface depression. The push rod then drives the slider to move up along the slide groove, causing the adjusting roller to move up a certain distance, thereby increasing the pressure on the steel belt, leveling the depression area, and improving the flatness of the steel belt surface.

[0011] Furthermore, the detection roller includes an inner roller and an outer roller, the outer roller is rotatably connected to the inner roller, and a detection component is provided in the inner roller, and the detection component is used to detect changes in the thickness of the steel strip.

[0012] By setting the detection roller to consist of an inner roller and an outer roller that can rotate relative to each other, when the friction force of the steel belt on the detection roller decreases, the relative position between the inner roller and the outer roller will shift. The change in friction force can be determined by detecting this offset through the detection component.

[0013] Furthermore, the detection assembly includes an arc block, a clamping block, a guide column and a support spring. The inner roller is provided with a movable groove, a guide groove and a detection groove. The guide groove and the detection groove are located on both sides of the movable groove. The arc block is slidably connected to the movable groove, the clamping block is firmly connected to the arc block, the outer roller is clamped to the clamping block, the guide column is firmly connected to the arc block, the guide column is slidably connected to the guide groove, one end of the support spring is firmly connected to the guide column, and the other end of the support spring is firmly connected to the inner wall of the guide groove.

[0014] When the detection roller rotates driven by the steel belt, the outer roller in direct contact with the steel belt will rotate relative to the inner roller under the action of friction. When there is no depression on the surface of the steel belt, the outer roller will drive the card block to deviate to one side under the action of friction, causing the arc block to deviate to one side along the movable groove, which also causes the guide column fixedly connected to the arc block to deviate to one side along the guide groove. The support spring is stretched under force, and the guide groove and the guide column can cooperate to guide the movement of the arc block; when a depression appears on the surface of the steel belt, the friction force of the steel belt on the detection roller will decrease, and under the action of the elastic force of the support spring, the arc block will retreat a certain distance along the movable groove, and the larger the range of the depression, the longer the distance the arc block retreats.

[0015] Furthermore, the detection assembly also includes a piston, a magnetic rod and a coil. The piston is slidably connected to the detection groove, the magnetic rod is firmly connected to the piston, the magnetic rod is located on the end of the piston away from the arc block, the coil is wound around the outer ring of the detection groove, the coil is externally connected to the detection system, and the space on one side of the movable groove close to the detection groove is filled with hydraulic oil;

[0016] During detection: the magnetic rod and the coil move relative to each other.

[0017] When a dent appears on the surface of the steel strip, the larger the range of the dent, the longer the distance the arc block retreats along the movable groove, and the hydraulic oil in the space on the side of the movable groove close to the detection groove will be drawn back, causing the piston in the movable groove to retreat a certain distance, and the magnetic rod to retreat a certain distance. The coil moves to cut the magnetic lines of force, generating an induced current. The larger the area of ​​the dent on the steel strip surface, the longer the distance the magnetic rod retreats, and the greater the induced current generated. That is, the greater the induced current detected by the detection system, the larger the dent range on the steel strip surface. By controlling the push rod to increase the pressure applied to the adjusting roller, it is possible to automatically control the pressure between the detection roller and the adjusting roller according to the size of the dent on the steel strip surface, automatically level the dent on the steel strip surface, and improve the surface quality of the steel strip.

[0018] Furthermore, the cross-sectional area of ​​the detection slot is smaller than the cross-sectional area of ​​the movable slot.

[0019] Since the range of variation of the friction force between the steel strip and the detection roller is small, the range of displacement of the arc block is also small. In order to ensure the accuracy of detection, the Pascal principle is used to set the cross-sectional area of ​​the detection groove smaller than that of the movable groove, thereby amplifying the moving distance of the arc block and facilitating detection.

[0020] Furthermore, the support assembly includes a bracket and a support roller. The bracket is tightly connected to the frame, and the support roller is rotatably connected to the bracket. The support roller is made of a high thermal conductivity copper alloy.

[0021] The support assembly can guide the steel strip and constrain the movement direction of the steel strip through support rollers symmetrically arranged on both sides of the steel strip. In addition, the support rollers made of high thermal conductivity copper alloy can accelerate the cooling of the steel strip.

[0022] Furthermore, the cooler adopts ultra-dense laminar cooling technology to achieve precise control of the cooling rate through a micron-level nozzle matrix.

[0023] Ultra-dense laminar cooling technology forms a continuous, stable columnar or curtain-shaped laminar water flow through micron-level nozzles. The water flows at a low velocity (about 1-3 m / s) and high density and covers the surface of the steel strip. Heat is removed through heat conduction and convection, achieving precise control of the cooling rate of 0.5-1.5 ° C / s, thereby promoting the uniform distribution of Nb precipitation phase at the austenite grain boundaries.

[0024] Furthermore, the production process comprises the following steps:

[0025] S1: Liquid steel flows into the tundish through the ladle, and the tundish regulates the flow of the steel;

[0026] S2: The crystallizer receives the molten steel injected from the tundish and solidifies it into a solid shell according to the specified cross-sectional shape;

[0027] S3: Cooling the solidified steel strip through a cooler to promote the uniform distribution of Nb precipitation phase at the austenite grain boundaries;

[0028] S4: The cooled steel strip is guided and adjusted by a guiding mechanism so that the steel strip is continuously output.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The turret dual-ladle design, combined with tundish flow regulation, ensures a continuous supply of molten steel and improves production efficiency. Ultra-dense laminar cooling technology precisely controls the cooling rate, promoting uniform distribution of Nb precipitation and improving the mechanical properties of the steel strip. From molten steel injection, forming, cooling, conditioning to cutting and coiling, the entire process is highly automated, reducing manual intervention and lowering production costs.

[0031] 2. The adjustment component is linked to the hydraulic system through electromagnetic induction. The relative rotation offset of the inner and outer rollers is detected to reflect the change in friction. The hydraulic oil drives the piston to retract. The electromagnetic induction between the magnetic bar and the coil generates a signal to control the push rod to adjust the pressure of the adjustment roller, automatically leveling the depression, significantly improving the flatness and surface finish of the steel strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 for Figure 1A local enlarged view of point A;

[0034] Figure 3 is a schematic diagram of the adjustment component of the present invention;

[0035] Figure 4 It is a partial cross-sectional view of the detection roller;

[0036] Figure 5 for Figure 4 A partial enlarged view of point B;

[0037] Figure 6 is a transverse cross-sectional view of the detection roller;

[0038] Figure 7 This is a schematic diagram of the operation of the adjustment component of the present invention;

[0039] Figure 8 for Figure 7 A partial enlarged view of point C.

[0040] In the figure: 1. frame; 2. turret; 3. ladle; 4. intermediate tank; 5. crystallizer; 6. cooler; 7. guide mechanism; 71. support assembly; 711. bracket; 712. support roller; 72. adjustment assembly; 721. fixed frame; 7211. slide; 722. detection roller; 7221. inner roller; 72211. movable groove; 72212. guide groove; 72213. detection groove; 7222. outer roller; 723. adjustment roller; 724. push rod; 725. slider; 73. detection assembly; 731. arc block; 732. clamping block; 733. guide column; 734. support spring; 735. piston; 736. magnetic rod; 737. coil; 8. cutter. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Example: Figures 1-8 As shown, the present invention provides a low-carbon Nb-containing steel strip production device and a production process technology solution. The steel strip production device includes a frame 1, a rotary tower 2 and a ladle 3. The rotary tower 2 is rotatably connected to the frame 1, and the ladle 3 is tightly connected to the rotary tower 2. The frame 1 is sequentially arranged with an intermediate tank 4, a crystallizer 5, a cooler 6, a guide mechanism 7 and a cutter 8 along the flow direction of the molten steel. The outlet of the ladle 3 is connected to the intermediate tank 4, the outlet of the intermediate tank 4 is connected to the crystallizer 5, and the outlet of the crystallizer 5 is toward the guide mechanism 7.

[0043] The frame 1 is fixed on the ground to provide stable support for each component. Two ladles 3 are symmetrically arranged on the rotary tower 2, and the rotary tower 2 can rotate freely on the frame 1, thereby realizing the continuous supply of molten steel. When the steel strip is cast, the molten steel in the ladle 3 flows into the intermediate tank 4. The intermediate tank 4 can control the flow rate of the molten steel so that the molten steel flows into the crystallizer 5 at a stable flow rate. The crystallizer 5 receives the molten steel injected from the intermediate tank 4 and solidifies it into a solid shell according to the specified cross-sectional shape. The steel strip is then cooled by the cooler 6 and conveyed by the guiding mechanism 7. Finally, the produced steel strip is cut and rolled by the cutter 8.

[0044] The guiding mechanism 7 includes a supporting assembly 71 and an adjusting assembly 72 . The supporting assembly 71 is used to pull the formed steel strip, and the adjusting assembly 72 is used to improve the surface quality of the steel strip.

[0045] When the solidified molten steel flows out of the crystallizer 5, the temperature of the steel strip is relatively high and it is relatively soft. In order to prevent the steel strip from deviating during transportation, the support component 71 is used to guide and pull the steel strip. In addition, the soft steel strip may form depressions on the surface due to the squeezing and collision of the mechanism during transportation, and defects may also appear on the surface of the steel strip as the oxide layer falls off during the cooling process. The defects on the surface of the steel strip are improved by the adjustment component 72.

[0046] The adjustment assembly 72 includes a fixed frame 721, a detection roller 722, an adjustment roller 723, a push rod 724 and a slider 725. The fixed frame 721 is tightly connected to the frame 1, the rotating shaft of the detection roller 722 is rotatably connected to the fixed frame 721, the push rod 724 is tightly connected to the frame 1, the output end of the push rod 724 is tightly connected to the slider 725, a slide groove 7211 is provided on the fixed frame 721, the slider 725 is slidably connected to the slide groove 7211, and the rotating shaft of the adjustment roller 723 is rotatably connected to the slider 725.

[0047] The fixing frame 721 is fixed on the frame 1 to provide support for the adjustment assembly 72. In the initial state, the gap between the detection roller 722 and the adjustment roller 723 is consistent with the standard thickness of the steel strip. The steel strip passes through the gap between the detection roller 722 and the adjustment roller 723 at a certain speed. Under the action of friction, the steel strip will drive the detection roller 722 and the adjustment roller 723 to rotate. When a depression appears on the surface of the steel strip, the contact area between the depression and the detection roller 722 is reduced, thereby causing the friction of the steel strip on the detection roller 722 at the depression to decrease. By detecting the size of the friction between the steel strip and the detection roller 722, the size of the depression on the steel strip surface can be determined, that is, the smaller the friction between the steel strip and the detection roller 722, the larger the range of the surface depression. Then, the push rod 724 drives the slider 725 to move up along the slide groove 7211, causing the adjustment roller 723 to move up a distance, thereby increasing the pressure on the steel strip, leveling the depression area, and improving the flatness of the steel strip surface.

[0048] The detection roller 722 includes an inner roller 7221 and an outer roller 7222. The outer roller 7222 is rotatably connected to the inner roller 7221. A detection component 73 is provided in the inner roller 7221. The detection component 73 is used to detect changes in the thickness of the steel strip.

[0049] By setting the detection roller 722 to consist of an inner roller 7221 and an outer roller 7222 that can rotate relative to each other, when the friction force of the steel belt on the detection roller 722 decreases, the relative position between the inner roller 7221 and the outer roller 7222 will shift. The change in friction force can be determined by detecting this offset through the detection component 73.

[0050] The detection assembly 73 includes an arc block 731, a clamping block 732, a guide column 733 and a support spring 734. The inner roller 7221 is provided with a movable groove 72211, a guide groove 72212 and a detection groove 72213. The guide groove 72212 and the detection groove 72213 are located on both sides of the movable groove 72211. The arc block 731 is slidingly connected to the movable groove 72211, the clamping block 732 is fastened to the arc block 731, the outer roller 7222 is clamped with the clamping block 732, the guide column 733 is fastened to the arc block 731, the guide column 733 is slidingly connected to the guide groove 72212, one end of the support spring 734 is fastened to the guide column 733, and the other end of the support spring 734 is fastened to the inner wall of the guide groove 72212.

[0051] When the cam 731 is in the unlocked position, the guide post 733 of the guide post 733 is moved to the left of the unlocking mechanism 731, so that the cam 731 is locked and the locking mechanism 732 is locked.

[0052] The detection assembly 73 also includes a piston 735, a magnetic rod 736, and a coil 737. The piston 735 is slidably connected to the detection groove 72213. The magnetic rod 736 is firmly connected to the piston 735. The magnetic rod 736 is located on the end of the piston 735 away from the arc block 731. The coil 737 is wound around the outer ring of the detection groove 72213. The coil 737 is externally connected to the detection system. The space on one side of the movable groove 72211 near the detection groove 72213 is filled with hydraulic oil.

[0053] During detection: the magnetic bar 736 and the coil 737 move relative to each other.

[0054] When a dent appears on the surface of the steel strip, the larger the range of the dent, the longer the distance the arc block 731 retreats along the movable groove 72211, and the hydraulic oil in the space on the side of the movable groove 72211 close to the detection groove 72213 is drawn back, causing the piston 735 in the movable groove 72211 to also retreat a certain distance, causing the magnetic rod 736 to also retreat a certain distance, and the coil 737 to cut the magnetic lines of force to generate an induced current. The larger the area of ​​the dent on the steel strip surface, the longer the distance the magnetic rod 736 retreats, and the greater the induced current generated. That is, the greater the induced current detected by the detection system, the larger the dent range on the steel strip surface. By controlling the push rod 724 to increase the pressure applied to the adjusting roller 723, the pressure between the detection roller 722 and the adjusting roller 723 is automatically controlled according to the size of the dent on the steel strip surface, the dent on the steel strip surface is automatically leveled, and the surface quality of the steel strip is improved.

[0055] The cross-sectional area of ​​the detection groove 72213 is smaller than the cross-sectional area of ​​the movable groove 72211 .

[0056] Since the range of variation of the friction force between the steel belt and the detection roller 722 is small, the offset range of the arc block 731 is small. In order to ensure the accuracy of the detection, the Pascal principle is used to set the cross-sectional area of ​​the detection groove 72213 to be smaller than that of the movable groove 72211, thereby amplifying the moving distance of the arc block 731 and facilitating detection.

[0057] The support assembly 71 includes a bracket 711 and a support roller 712. The bracket 711 is tightly connected to the frame 1, and the support roller 712 is rotatably connected to the bracket 711. The support roller 712 is made of a high thermal conductivity copper alloy.

[0058] The support assembly 71 can guide the steel strip and constrain the moving direction of the steel strip through the support rollers 712 symmetrically arranged on both sides of the steel strip. In addition, the support rollers 712 made of high thermal conductivity copper alloy can accelerate the cooling of the steel strip.

[0059] Cooler 6 adopts ultra-dense laminar cooling technology, and achieves precise control of the cooling rate through a micron-level nozzle matrix.

[0060] Ultra-dense laminar cooling technology forms a continuous, stable columnar or curtain-shaped laminar water flow through micron-level nozzles. The water flows at a low velocity (about 1-3 m / s) and high density and covers the surface of the steel strip. Heat is removed through heat conduction and convection, achieving precise control of the cooling rate of 0.5-1.5 ° C / s, thereby promoting the uniform distribution of Nb precipitation phase at the austenite grain boundaries.

[0061] The production process includes the following steps:

[0062] S1: Liquid steel flows into the tundish 4 through the ladle 3, and the tundish 4 regulates the flow of the steel;

[0063] S2: The molten steel injected from the tundish 4 is received by the crystallizer 5 and solidified into a solid shell according to the specified cross-sectional shape;

[0064] S3: Cooling the solidified steel strip through the cooler 6 to promote the uniform distribution of the Nb precipitation phase at the austenite grain boundaries;

[0065] S4: The cooled steel strip is guided and adjusted by the guiding mechanism 7 so that the steel strip is continuously output.

[0066] The working principle of the present invention is continuous feeding and forming. Two ladles are symmetrically arranged on a rotating tower, and continuous molten steel is supplied through rotation. The molten steel enters the crystallizer after its flow rate is regulated in an intermediate tank, forming a steel strip with a specified cross-sectional shape. The strip is then cooled by a cooler. The support assembly uses high-thermal-conductivity copper alloy support rollers to constrain the strip's direction and accelerate cooling. The adjustment assembly uses detection rollers and adjustment rollers to detect surface concavities on the strip in real time. The relative rotational offset between the inner and outer detection rollers reflects changes in friction. Hydraulic oil drives the piston back. The electromagnetic induction signal generated by the relative motion between the magnetic bar and the coil controls the push rod to adjust the pressure of the adjustment roller, automatically leveling the concavities. Finally, after the strip has been cooled and surface treated, the cutter completes the coiling, achieving continuous production.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A low-carbon Nb-containing steel strip production device, characterized by: The steel strip production device comprises a frame (1), a rotary tower (2) and a ladle (3), wherein the rotary tower (2) is rotatably connected to the frame (1), and the ladle (3) is firmly connected to the rotary tower (2). An intermediate tank (4), a crystallizer (5), a cooler (6), a guide mechanism (7) and a cutter (8) are sequentially arranged on the frame (1) along the flow direction of the molten steel. The outlet of the ladle (3) is communicated with the intermediate tank (4), the outlet of the intermediate tank (4) is communicated with the crystallizer (5), and the outlet of the crystallizer (5) faces the guide mechanism (7).

2. The low-carbon Nb-containing steel strip production device according to claim 1, characterized in that: The guiding mechanism (7) comprises a supporting assembly (71) and an adjusting assembly (72), wherein the supporting assembly (71) is used to pull the formed steel strip, and the adjusting assembly (72) is used to improve the surface quality of the steel strip.

3. The low-carbon Nb-containing steel strip production device according to claim 2, characterized in that: The adjustment assembly (72) comprises a fixed frame (721), a detection roller (722), an adjustment roller (723), a push rod (724) and a slider (725); the fixed frame (721) is fixedly connected to the frame (1); the rotating shaft of the detection roller (722) is rotationally connected to the fixed frame (721); the push rod (724) is fixedly connected to the frame (1); the output end of the push rod (724) is fixedly connected to the slider (725); a sliding groove (7211) is provided on the fixed frame (721); the slider (725) is slidably connected to the sliding groove (7211); and the rotating shaft of the adjustment roller (723) is rotationally connected to the slider (725).

4. The low-carbon Nb-containing steel strip production device according to claim 3, characterized in that: The detection roller (722) comprises an inner roller (7221) and an outer roller (7222), the outer roller (7222) being rotatably connected to the inner roller (7221), and a detection component (73) is provided in the inner roller (7221), and the detection component (73) is used to detect changes in the thickness of the steel strip.

5. The low-carbon Nb-containing steel strip production device according to claim 4, characterized in that: The detection assembly (73) comprises an arc block (731), a clamping block (732), a guide column (733) and a support spring (734); a movable groove (72211), a guide groove (72212) and a detection groove (72213) are provided on the inner roller (7221); the guide groove (72212) and the detection groove (72213) are located on both sides of the movable groove (72211); the arc block (731) slides with the movable groove (72211) The clamping block (732) is tightly connected to the arc block (731), the outer roller (7222) is clamped to the clamping block (732), the guide post (733) is tightly connected to the arc block (731), the guide post (733) is slidingly connected to the guide groove (72212), one end of the support spring (734) is tightly connected to the guide post (733), and the other end of the support spring (734) is tightly connected to the inner wall of the guide groove (72212).

6. The low-carbon Nb-containing steel strip production device according to claim 5, characterized in that: The detection assembly (73) further includes a piston (735), a magnetic rod (736), and a coil (737). The piston (735) is slidably connected to the detection groove (72213). The magnetic rod (736) is firmly connected to the piston (735). The magnetic rod (736) is located at an end of the piston (735) away from the arc block (731). The coil (737) is wound around the outer ring of the detection groove (72213). The coil (737) is externally connected to the detection system. The space on one side of the movable groove (72211) close to the detection groove (72213) is filled with hydraulic oil. During detection: the magnetic rod (736) and the coil (737) move relative to each other.

7. The low-carbon Nb-containing steel strip production device according to claim 6, characterized in that: The cross-sectional area of ​​the detection groove (72213) is smaller than the cross-sectional area of ​​the movable groove (72211).

8. The low-carbon Nb-containing steel strip production device according to claim 2, characterized in that: The support assembly (71) comprises a bracket (711) and a support roller (712); the bracket (711) is tightly connected to the frame (1); the support roller (712) is rotatably connected to the bracket (711); and the support roller (712) is made of a high-thermal-conductivity copper alloy.

9. The low-carbon Nb-containing steel strip production device according to claim 1, characterized in that: The cooler (6) adopts ultra-dense laminar cooling technology and realizes precise control of the cooling rate through a micron-level nozzle matrix.

10. The production process of a low-carbon Nb-containing steel strip production device according to claim 1, characterized in that: The production process comprises the following steps: S1: Liquid steel flows into the intermediate tank (4) through the ladle (3), and the intermediate tank (4) regulates the flow rate of the liquid steel; S2: receiving the molten steel injected from the intermediate tank (4) through the crystallizer (5) and solidifying it into a solid shell according to the specified cross-sectional shape; S3: Cooling the solidified steel strip through a cooler (6) to promote the uniform distribution of Nb precipitation phase at the austenite grain boundaries; S4: The cooled steel strip is guided and adjusted by the guiding mechanism (7) so that the steel strip is continuously output.

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