An arc vibrating thin strip continuous casting machine and a thin strip continuous casting and rolling production line

Abstract

Apparatus for continuous casting of steel strip which comprises a pair of symmetrically arranged arc-shaped water-cooled copper plates 1-1 which together define a cavity for holding molten steel. Each plate 1-1 is fixed to a respective shaft 1-4 via a respective arc-shaped frame 1-2, with each shaft 1-4 being at the geometric centre of its respective plate 1-1. Each plate 1-1 can be vibrated about its respective shaft 1-4 using a respective vibration driving device 1-3 as strip is cast. At least one pair of driving rollers 2 which also compress the strip is arranged below the casting apparatus, sequentially followed by strip guiding rollers 3, driving rollers (4, Fig. 2), a rolling stand (5, Fig 2), cooling apparatus (6, Fig. 2), shearing apparatus (7, Fig. 2) and a strip winding machine (8, Fig 2). One of the pair of driving rollers is horizontally moveable to clamp the strip. The vibration amplitude can be ± 1 mm to ± 20 mm and the frequency can be 1-10 Hz.

Description

Arc-shaped vibrating thin strip continuous casting machine and thin strip continuous casting and rolling production line Technical Field

[0001] The invention belongs to the field of metallurgy and relates to an arc-shaped vibrating thin strip continuous casting machine and a thin strip continuous casting and rolling production line. Background Art

[0002] Currently, the steel industry is developing in a green, low-carbon, energy-saving, environmentally friendly, and low-cost direction. Short-process continuous casting and rolling processes are gaining increasing attention from steel companies. Thin strip casting, a near-net-shape continuous steel casting technology, can directly cast thin strips with a thickness of less than 15 mm, which are then rolled directly into strip. Compared to traditional continuous casting technologies, thin strip casting offers significant advantages such as a shorter process flow, lower energy consumption, reduced investment, smaller footprint, higher labor efficiency, and lower production costs. Breakthroughs in thin strip casting solutions and key technologies will have a significant impact on the steel industry.

[0003] Twin-roller thin strip casting technology was proposed by Henry Bessemer in 1856. Experimentation began in the 1950s and gradually entered industrial production. Twin-roller thin strip casting uses continuous casting rollers as crystallizers. The rollers rotate synchronously at high speeds in opposite directions, where molten steel is cooled and rolled into thin strip steel strands. Because the rolls rotate in the same direction, the strand shell fits tightly against the rolls. Compared to conventional continuous casting processes, the lack of lubrication and mold release between the strip and the rolls makes it prone to adhesion, impacting the quality and stability of the thin strip steel strands. Due to the unique process limitations inherent in twin-roller thin strip casting under the unique conditions of molten steel solidification and the constraints of several key technologies, twin-roller thin strip casting has yet to achieve large-scale industrial production in the steel industry.

[0004] Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an arc-shaped vibrating thin-strip continuous casting machine and a thin-strip continuous casting and rolling production line to solve the problem in the current thin-strip continuous casting technology that there is a lack of lubrication and demolding between the thin-strip continuous casting billet and the crystallization roller, which is prone to adhesion and affects the quality of the thin-strip continuous casting billet and the stability of production.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An arc-shaped vibrating thin strip continuous casting machine comprises an arc-shaped vibrating crystallizer (1), a pressing drive device (2) and a thin strip continuous casting billet guide device (3) arranged in sequence according to a production flow line; the arc-shaped vibrating crystallizer (1) comprises an inner arc vibrating unit and an outer arc vibrating unit, the inner arc vibrating unit and the outer arc vibrating unit are arranged symmetrically, each vibrating unit comprises an arc-shaped copper plate (1-1), an arc-shaped support frame (1-2), a vibrating drive device (1-3), a support shaft (1-4) and a support base (1-5); the arc-shaped copper plate (1-1) is fixed on the arc-shaped support frame (1-2), and the arc-shaped support frame (1-2) is connected to the support shaft (1-4) by the support shaft (1-4). ) is supported on a support base (1-5); the arc-shaped support frames (1-2) of the inner arc vibration unit and the outer arc vibration unit and the arc-shaped copper plates (1-1) connected thereto, driven by their respective vibration drive devices (1-3), respectively perform up and down arc-shaped vibrations along their respective support shafts (1-4); the gap between the arc-shaped copper plates (1-1) of the inner arc vibration unit and the outer arc vibration unit constitutes a cavity for receiving molten steel; the pressing drive device (2) is composed of a pair of driving rollers and is arranged below the arc-shaped vibration crystallizer (1); the thin strip continuous casting billet guide device (3) is arranged along the arc-shaped direction of the thin strip continuous casting billet to support and guide the thin strip continuous casting billet.

[0008] Furthermore, the arc-shaped copper plate (1-1) is a part of a circular arc, and the arc-shaped surfaces of the arc-shaped copper plate (1-1) and the arc-shaped support frame (1-2) both take the axis of the support shaft (1-4) as the center of the circle.

[0009] Furthermore, the arc-shaped support frame (1-2) is provided with a cooling water inlet channel and a water return channel, which are connected to the water trough processed on the inner arc surface of the arc-shaped copper plate (1-1), and the cooling water is passed to cool the arc-shaped copper plate.

[0010] Furthermore, the amplitude of the up and down arc vibrations of the inner arc vibration unit and the outer arc vibration unit is ±1 to ±20 mm, and the vibration frequency is 1 to 10 Hz.

[0011] Furthermore, the support base (1-5) of the outer arc vibration unit is fixed; the support base (1-5) of the inner arc vibration unit moves horizontally relative to the support base (1-5) of the outer arc vibration unit and is locked by a locking device (1-6) for adjusting the gap between the inner arc vibration unit and the outer arc vibration unit to achieve the production of thin strip continuous casting billets of different thicknesses.

[0012] Furthermore, the pressing drive device (2) is composed of an inner arc driving roller and an outer arc driving roller, which are driven by connected motors, reducers, and universal joints to rotate relative to each other. The inner arc driving roller is driven by a hydraulic cylinder to move horizontally toward the outer arc driving roller to clamp and drive the thin strip continuous casting billet.

[0013] Furthermore, the pressing drive device (2) is arranged close to the arc-shaped vibration crystallizer (1), so that the thin strip continuous casting billet generated in the arc-shaped vibration crystallizer (1) immediately enters the pressing drive device (2).

[0014] Furthermore, the thin strip continuous casting billet guiding device (3) is composed of one or more pairs of free rollers, which are arranged along the arc direction of the thin strip continuous casting billet to support and guide the thin strip continuous casting billet.

[0015] A thin strip continuous casting and rolling production line comprises an arc-shaped vibrating crystallizer (1), a pressing drive device (2), a thin strip continuous casting billet guide device (3), a thin strip driving roller (4), a rolling mill (5), a thin strip cooling device (6), a shearing machine (7), and a coiler (8) arranged in sequence along a production line.

[0016] The beneficial effects of the present invention are:

[0017] (1) The present invention adopts a specially designed arc-shaped vibrating crystallizer, in which the inner arc vibrating unit and the outer arc vibrating unit are arranged symmetrically. The cavity between the inner arc vibrating unit and the outer arc vibrating unit is used to receive and cool molten steel. Molten steel is injected into the cavity from the molten steel inlet at the upper end to form a thin strip steel continuous casting billet, and is output from the billet outlet at the lower end. Driven by the vibration drive device, the inner arc vibrating unit and the outer arc vibrating unit respectively vibrate in an arc shape along their respective support axes. The downward synchronous vibration has the function of casting and rolling, which is conducive to the formation of thin strip continuous casting billets. The upward synchronous vibration is conducive to the demolding between the thin strip continuous casting billet and the copper plate and the addition of lubricant, preventing the thin strip continuous casting billet from adhering to the copper plate and improving the surface quality of the thin strip continuous casting billet.

[0018] (2) The pressing drive device is arranged below the arc-shaped vibrating crystallizer and close to the arc-shaped vibrating crystallizer. The high-temperature thin strip continuous casting billet generated in the arc-shaped vibrating crystallizer immediately enters the pressing drive device. The arc driving roller inside the pressing drive device can compress the thin strip continuous casting billet to a certain extent under the drive of the hydraulic cylinder, which is beneficial to improving the internal structure of the thin strip continuous casting billet and improving the internal quality of the thin strip continuous casting billet.

[0019] (3) The present invention adopts a combination of an arc-shaped vibrating crystallizer and a pressing drive device to realize the separation of the generation of thin-strip continuous casting billets and the billet drawing drive, which is beneficial to improving the quality of thin-strip continuous casting billets and realizing large-scale industrial stable production.

[0020] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0022] FIG1 is a schematic diagram of the arrangement of an arc-shaped vibrating thin strip continuous casting machine according to the present invention;

[0023] FIG2 is a schematic diagram showing the layout of a thin strip continuous casting and rolling production line using an arc-shaped vibrating thin strip continuous casting machine according to the present invention.

[0024] Figure numerals: arc-shaped vibration crystallizer 1, arc-shaped copper plate 1-1, arc-shaped support frame 1-2, vibration drive device 1-3, support shaft 1-4, support base 1-5, locking device 1-6, pressing drive device 2, thin strip continuous casting guide device 3, thin strip drive roller 4, rolling mill 5, thin strip cooling device 6, shearing machine 7, coiler 8. DETAILED DESCRIPTION

[0025] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0026] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0027] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] Please refer to FIG1 , which shows an arc-shaped vibrating thin strip continuous casting machine, comprising an arc-shaped vibrating crystallizer 1 , a pressing drive device 2 and a thin strip continuous casting billet guide device 3 arranged in sequence according to a production flow line.

[0029] The arc-shaped vibrating mold 1 comprises an inner arc vibrating unit and an outer arc vibrating unit, arranged symmetrically. Each vibrating unit comprises an arc-shaped copper plate 1-1, an arc-shaped support frame 1-2, a vibration drive device 1-3, a support shaft 1-4, and a support base 1-5. The arc-shaped copper plate 1-1 is fixed to the arc-shaped support frame 1-2, which is supported on the support base 1-5 via the support shaft 1-4. Driven by the vibration drive device 1-3, the arc-shaped support frame 1-2 and its connected arc-shaped copper plate 1-1 vibrate in an arc shape along the support shaft 1-4.

[0030] The cavity between the inner arc vibration unit and the outer arc vibration unit is used to hold molten steel. The upper end of the cavity is the molten steel inlet, and the lower end is the thin strip continuous casting outlet. The cavity gradually narrows from the molten steel inlet to the thin strip continuous casting outlet.

[0031] In this embodiment, the arc-shaped copper plate 1-1 and the arc-shaped support frame 1-2 fixed thereto have an arc-shaped surface that is larger than a quarter of a circle, ensuring that when the arc-shaped copper plate 1-1 vibrates in an arc shape, the arc-shaped surface is always in contact with the newly generated thin strip continuous casting billet, and the center of the circle is the axis of the support shaft 1-4.

[0032] The arc support frames 1-2 of the inner arc vibration unit and the outer arc vibration unit are respectively provided with cooling water inlet channels and return channels. The inner arc surface of the arc copper plate 1-1 is processed with a water trough. After the arc copper plate 1-1 is fixed on the arc support frame 1-2, the cooling water inlet channels and return channels on the arc support frame 1-2 are connected to the water trough of the arc copper plate 1-1, and are connected to the external cooling water pipeline to form a closed-loop cooling water channel to cool the arc copper plate 1-1.

[0033] Molten steel is injected into the cavity formed by the inner and outer arc vibrating units. Cooling water in the cooling water channel cools the curved copper plate 1-1. Driven by the vibration drive device 1-3, the curved copper plates 1-1 of the inner and outer arc vibrating units each independently reciprocate in an arc along the arc support frame 1-2. The two curved copper plates 1-1 and their connected curved support frame 1-2 vibrate synchronously, forming a thin strip continuous casting billet. The vibration drive device 1-3 can be driven by a servo hydraulic cylinder, or by a motor and deflection shaft. The inner and outer arc vibrating units vibrate according to a specific vibration waveform (sinusoidal or non-sinusoidal). The amplitude of the curved copper plate 1-1 is ±1 to ±20 mm, and the frequency is 1 to 10 Hz. The specific setting and adjustment can be based on the casting speed of the thin strip continuous casting billet. When the two vibration units synchronously vibrate in an arc shape downward, they have the effect of casting and rolling, which is beneficial to the generation of thin strip steel continuous casting billets; when they synchronously vibrate in an arc shape upward, they are beneficial to the demoulding and lubricant addition between the thin strip continuous casting billet and the arc-shaped copper plate 1-1, preventing adhesion and improving surface quality.

[0034] The supporting base 1-5 of the outer arc vibration unit is fixed; the supporting base 1-5 of the inner arc vibration unit can be horizontally moved relative to the supporting base 1-5 of the outer arc vibration unit through a screw adjustment mechanism, and is locked by a locking device 1-6, which is used to adjust the gap between the inner arc vibration unit and the outer arc vibration unit to achieve the production of thin strip continuous casting billets of different thicknesses.

[0035] The compression drive unit 2 is arranged below the arc-shaped vibrating crystallizer 1, in close proximity to the arc-shaped vibrating crystallizer 1. The compression drive unit 2 consists of an inner arc drive roller and an outer arc drive roller, each driven by a connected motor, reducer, and universal joint for relative rotation. The inner arc drive roller is driven by a hydraulic cylinder to move horizontally toward the outer arc drive roller, clamping and driving the thin strip continuous casting billet. The high-temperature thin strip continuous casting billet generated in the arc-shaped vibrating crystallizer 1 immediately enters the compression drive unit 2. Driven by the hydraulic cylinder, the inner arc drive roller of the compression drive unit 2 can compress the thin strip continuous casting billet to a certain extent, which is beneficial to improving the internal structure of the thin strip continuous casting billet and enhancing the internal quality of the thin strip continuous casting billet.

[0036] The thin strip continuous casting strand guiding device 3 is composed of one or more pairs of free rollers. The number of free rollers can be set according to actual needs. The free rollers are arranged along the arc direction of the thin strip continuous casting strand to support and guide the thin strip continuous casting strand.

[0037] As shown in FIG2 , this embodiment further provides a thin strip continuous casting and rolling production line, comprising an arc-shaped vibrating crystallizer 1, a pressing drive device 2, a thin strip continuous casting strand guide device 3, a thin strip driving roller 4, a rolling mill 5, a thin strip cooling device 6, a shearing machine 7, and a coiler 8, which are sequentially arranged along the production line. The thin strip continuous casting strand produced by the arc-shaped vibrating thin strip continuous casting machine is rolled, cooled, and sheared through subsequent processes, and then collected into a coil by the coiler (8).

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. An arc-shaped vibrating thin strip continuous casting machine, characterized in that: The invention comprises an arc-shaped vibration crystallizer (1), a pressing drive device (2) and a thin strip continuous casting billet guide device (3) arranged in sequence according to a production flow line; the arc-shaped vibration crystallizer (1) comprises an inner arc vibration unit and an outer arc vibration unit, the inner arc vibration unit and the outer arc vibration unit are arranged symmetrically, and each vibration unit is composed of an arc-shaped copper plate (1-1), an arc-shaped support frame (1-2), a vibration drive device (1-3), a support shaft (1-4) and a support base (1-5); the arc-shaped copper plate (1-1) is fixed on the arc-shaped support frame (1-2), and the arc-shaped support frame (1-2) is supported on the support shaft (1-4). On the base (1-5); the arc-shaped support frames (1-2) of the inner arc vibration unit and the outer arc vibration unit and the arc-shaped copper plates (1-1) connected thereto, driven by respective vibration drive devices (1-3), respectively perform up and down arc-shaped vibrations along respective support shafts (1-4); the gap between the arc-shaped copper plates (1-1) of the inner arc vibration unit and the outer arc vibration unit constitutes a cavity for receiving molten steel; the pressing drive device (2) is composed of a pair of driving rollers and is arranged below the arc-shaped vibration crystallizer (1); the thin strip continuous casting billet guide device (3) is arranged along the arc-shaped direction of the thin strip continuous casting billet to support and guide the thin strip continuous casting billet.

2. The arc-shaped vibrating thin strip continuous casting machine according to claim 1, characterized in that: The arc-shaped copper plate (1-1) is a part of an arc, and the arc-shaped surfaces of the arc-shaped copper plate (1-1) and the arc-shaped support frame (1-2) both take the axis of the support shaft (1-4) as the center of the circle.

3. The arc-shaped vibrating thin strip continuous casting machine according to claim 1, characterized in that: The arc-shaped support frame (1-2) is provided with a cooling water inlet channel and a water return channel, which are connected to a water trough processed on the inner arc surface of the arc-shaped copper plate (1-1), and the cooling water is passed through to cool the arc-shaped copper plate.

4. The arc-shaped vibrating thin strip continuous casting machine according to claim 1, characterized in that: The amplitude of the up and down arc vibration of the inner arc vibration unit and the outer arc vibration unit is ±1 to ±20 mm, and the vibration frequency is 1 to 10 Hz.

5. The arc-shaped vibrating thin strip continuous casting machine according to claim 1, characterized in that: The support base (1-5) of the outer arc vibration unit is fixed; the support base (1-5) of the inner arc vibration unit moves horizontally relative to the support base (1-5) of the outer arc vibration unit and is locked by a locking device (1-6) for adjusting the gap between the inner arc vibration unit and the outer arc vibration unit, thereby realizing the production of thin strip continuous casting billets of different thicknesses.

6. The arc-shaped vibrating thin strip continuous casting machine according to claim 1, characterized in that: The pressing drive device (2) is composed of an inner arc driving roller and an outer arc driving roller, which are driven by connected motors, reducers and universal joints to rotate relative to each other. The inner arc driving roller is driven by a hydraulic cylinder to move horizontally toward the outer arc driving roller to clamp and drive the thin strip continuous casting billet.

7. The arc-shaped vibrating thin strip continuous casting machine according to claim 1, characterized in that: The pressing drive device (2) is arranged close to the arc-shaped vibration crystallizer (1), so that the thin strip continuous casting billet generated in the arc-shaped vibration crystallizer (1) immediately enters the pressing drive device (2).

8. The arc-shaped vibrating thin strip continuous casting machine according to claim 1, characterized in that: The thin strip continuous casting billet guiding device (3) is composed of one or more pairs of free rollers, which are arranged along the arc direction of the thin strip continuous casting billet to support and guide the thin strip continuous casting billet.

9. A thin strip continuous casting and rolling production line, characterized by: The invention comprises an arc-shaped vibrating crystallizer (1), a pressing drive device (2), a thin strip continuous casting slab guide device (3), a thin strip driving roller (4), a rolling mill (5), a thin strip cooling device (6), a shearing machine (7) and a coiler (8) which are sequentially arranged along a production line.

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