A metal strip guiding device, a metal strip production line and a metal strip production method

Abstract

The present invention relates to a metal strip guiding device, a metal strip production line and a metal strip production method, belonging to the technical field of metal rolling. A metal strip guiding device is arranged between a shearing machine and a coiling unit. The metal strip guiding device includes a guiding unit arranged on the upper side of the metal strip. The guiding unit includes a plurality of traction rollers arranged at intervals. The theoretical position of the traction rollers is spaced from the metal strip by a certain distance so that the metal strip in a normal state can pass through freely. The linear speed of the traction rollers is not less than the production running speed of the metal strip so that the upturned metal strip can move forward quickly and flatten under the traction of friction, solving the problems such as the metal strip taking off, stacking and winding caused by the speed difference between the head and the subsequent parts of the metal strip, enabling the head of the metal strip to quickly and successfully thread the strip, reducing the production accidents caused by the threading failure, thereby reducing the downtime of the production line, improving the productivity of the production line, and reducing the loss of product waste caused by production accidents.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal rolling, and relates to a metal strip guiding device, a metal strip production line and a metal strip production method. Background Art

[0002] Short-process continuous casting and rolling is a technology successfully developed in the late 1980s of the 20th century. After converter steelmaking and full continuous casting, it is another revolutionary technology in the field of iron and steel metallurgy, leading the development direction of steel manufacturing technology. Its successful development realizes the organic combination of thin-gauge slab continuous casting and hot continuous rolling, which is a major breakthrough in near-net shape manufacturing technology. The short-process continuous casting and rolling production technology is not only very beneficial to the construction of an energy-saving and environment-friendly society. As the development trend of future iron and steel metallurgy technology, its more prominent advantage compared with traditional hot continuous rolling is that the short-process continuous casting and rolling technology can produce thin-gauge strip steel that is difficult to produce by traditional hot continuous rolling. This benefits from the endless or semi-endless production process of the short-process continuous casting and rolling technology, which avoids the threading process with the highest failure rate during single-piece rolling in conventional hot continuous rolling, and greatly improves the rolling stability compared with conventional hot continuous rolling.

[0003] During the endless or semi-endless production of short-process continuous casting and rolling, after the strip steel passes through the finishing mill, it is cooled to the target temperature through laminar cooling control, sheared by a shearing machine, and then introduced into different coiling machines to achieve high-speed splitting. The head of the next strip steel then runs through the shearing machine to the coiling machine to be threaded and coiled. Due to the characteristics of the short-process continuous casting and rolling production line being the production of ultra-thin gauge strip steel, and in recent years, with the continuous breakthrough of high casting speed continuous casting technology, the production speed of the rolling line has also been continuously increasing. During the process of the strip steel head running to the coiling machine after being sheared by the shearing machine for thin-gauge strip steel, problems such as the strip steel lifting off the ground, stacking and winding are extremely likely to occur, causing the production line to stop due to accidents, resulting in a decline in economic benefits and production capacity.

[0004] In response to this problem, patent documents such as CN102421545A, CN1239447A, CN101678420A, CN1671491A, etc. have all proposed their respective solutions. However, from the application effect, the problem has not been effectively solved. In addition, with the progress of production technology, the casting speed and thickness of continuous casting billets have been continuously broken through. Coupled with the higher requirements for ultra-thin and extremely thin gauge products in the downstream market due to the trend of replacing cold with hot, the strip steel thickness has been continuously reduced, and the production line speed has been continuously increased. The problems such as the strip steel head lifting off the ground, stacking and winding during threading have become more prominent, and the production line failures have increased, which has become a major bottleneck restricting the efficient production of ultra-thin strip steel.

[0005] There are also technologies that propose to use belt conveyor technology to address this problem. Although theoretically it can effectively solve the problems that occur during the high-speed threading process, due to the characteristics of the high-temperature environment of this problem, the following problems exist in the actual application process when using the belt conveyor solution: First, ordinary belts cannot meet the requirements of high-temperature operation, and belts made of high-temperature-resistant materials must be used; second, although high-temperature-resistant belts can meet the working requirements, they are limited by the working duration, with rapid material loss and high usage costs; third, the material properties (such as strength, stiffness, elasticity, ductility, etc.) of high-temperature-resistant belts will change in a high-temperature environment, reducing the working stability of the system. For the above reasons, there are still difficulties in the application and implementation of this technology. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a metal belt guiding device, a metal belt production line, and a metal belt production method to solve the problems of the metal belt being airborne, stacked, and wound due to the speed difference between the head and the subsequent parts of the metal belt.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A metal belt guiding device includes a guiding unit arranged on the upper side of the metal belt. The guiding unit includes a number of traction rollers arranged at intervals. The traction rollers are spaced a certain distance from the theoretical position of the metal belt to allow the metal belt in a normal state to pass through freely. The linear speed of the traction rollers is not less than the production running speed of the metal belt so that the upturned metal belt can move forward and flatten under the traction of friction. The distance between the traction rollers and the metal belt is fixed or adjustable.

[0009] Optionally, the guiding unit is arranged parallel or inclined to the theoretical position of the metal belt; when arranged inclinedly, along the running direction of the metal belt, the distance between the guiding unit and the metal belt gradually decreases.

[0010] Optionally, multiple groups of the guiding units are provided and arranged sequentially along the running direction of the metal belt.

[0011] Optionally, each guiding unit can be arranged parallel or inclined to the theoretical position of the metal belt; when arranged inclinedly, along the running direction of the metal belt, the distance between the guiding unit and the metal belt gradually decreases.

[0012] Optionally, one end or both ends of the traction roller extend out of the conveying roller path of the metal belt and are supported on the traction roller bracket, and the height of the traction roller bracket is adjustable.

[0013] Optionally, the linear speed of the traction roller is adjustable.

[0014] Optionally, the linear speed of the traction roller is 1 to 2 times the production running speed of the metal belt.

[0015] Optionally, a limiting unit is further included. The limiting unit includes a limiting plate located between the traction rollers. The distance between the limiting plate and the traction rollers is less than the thickness of the metal strip, and the theoretical position distance between the limiting plate and the metal strip is not less than the theoretical position distance between the traction rollers and the metal strip.

[0016] Optionally, the theoretical positions of the limiting plate and the metal strip are arranged in parallel or obliquely; when arranged obliquely, along the running direction of the metal strip, the distance between the limiting plate and the metal strip gradually decreases.

[0017] Optionally, each limiting plate is arranged horizontally, and along the running direction of the metal strip, the distance between the limiting plate and the metal strip gradually decreases.

[0018] Optionally, the surface of the limiting plate facing the metal strip is smooth to reduce the friction with the metal strip.

[0019] Optionally, the limiting plates are independent of each other, or adjacent limiting plates are connected as a whole by a connecting rod located on their side edges.

[0020] Optionally, the projection of the longitudinal center line of the guiding unit on the conveying roller path of the metal strip coincides with the longitudinal center line of the conveying roller path of the metal strip.

[0021] Optionally, the projection of the center line of the traction roller on the conveying roller path of the metal strip coincides with the center line of the conveying roller of the conveying roller path of the metal strip.

[0022] Optionally, the projection of the center line of the traction roller on the conveying roller path of the metal strip coincides with the center line between two adjacent conveying rollers of the conveying roller path of the metal strip.

[0023] Optionally, the heat-resistant temperature of the traction roller and the limiting plate is not lower than 780 °C.

[0024] A metal strip production line includes a slab rolling unit, a shearing machine, and a coiling unit arranged sequentially along the rolling direction. A metal strip guiding device as described above is provided between the shearing machine and the coiling unit.

[0025] Optionally, the coiling unit includes at least two coiling machines, and a metal strip guiding device is also provided between adjacent coiling machines.

[0026] Optionally, when there are multiple groups of guiding units of the metal strip guiding device, the distance between the limiting plate of the guiding unit close to the coiling unit and the metal strip gradually decreases.

[0027] Optionally, the conveying roller path located under the metal strip is replaced by the structure of the metal strip guiding device with a limiting plate. At this time, the distance between the traction rollers located under the metal strip needs to be less than a set value, and this set value is the minimum cantilever value to prevent the metal strip cantilever beam from sagging and jamming.

[0028] A method for producing a metal strip, in which the above-mentioned metal strip guiding device is arranged between a shearing machine and a coiling unit. After the shearing machine shears the metal strip, before the leading end of the new metal strip reaches the pinch rolls at the outlet of the shearing machine, the metal strip guiding device is pressed down to the working position to guide the leading end of the metal strip to run to the pinch rolls of the coiling machine for threading; when the threading is successful and the coiling machine establishes tension, the metal strip guiding device is lifted to the standby position.

[0029] The beneficial effects of the present invention are as follows:

[0030] 1. It solves the problems of the metal strip taking off, stacking and winding caused by the speed difference between the head and the subsequent parts of the metal strip, enables the leading end of the metal strip to quickly and successfully thread, reduces the production accidents caused by threading failure, further reduces the downtime of the production line, improves the productivity of the production line, reduces the loss of product rejection caused by production accidents, thereby improving the metal recovery rate, and comprehensively improves the production efficiency and economic benefits of the production line.

[0031] 2. Compared with the existing belt traction technology, it also has the following beneficial effects:

[0032] 1) The guiding unit and the limiting unit of the metal strip guiding device of the present invention are both rigidly connected, the rigidity of the whole device is greater, the deformation amount during work is small, and compared with the existing belt traction technology, the mechanical structure has higher stability and better production stability.

[0033] 2) The guiding unit and the limiting unit of the metal strip guiding device of the present invention can both be made of low-cost heat-resistant steel. Compared with the belt traction technology using high-temperature-resistant belts, the raw material cost in the present invention is lower, and the service life of the heat-resistant steel is long, thereby reducing the investment cost and maintenance cost.

[0034] 3) For the existing belt traction technology, if a small unit structure is adopted, the consumption of high-temperature-resistant belts will increase, and if a large unit structure is adopted, it is not conducive to the maintenance of local damage and requires overall replacement; the guiding unit and the limiting unit of the metal strip guiding device of the present invention both adopt a small unit structure, which is convenient for the maintenance and replacement after local damage, and reduces the maintenance cost.

[0035] Other advantages, objectives and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0037] Figure 1 It is a layout schematic diagram of Embodiment 1 of the present invention;

[0038] Figure 2 It is a layout schematic diagram of Embodiment 2 of the present invention;

[0039] Figure 3 It is a layout schematic diagram of Embodiment 3 of the present invention;

[0040] Figure 4 It is a layout schematic diagram of Embodiment 4 of the present invention;

[0041] Figure 5 It is a layout schematic diagram of Embodiment 5 of the present invention;

[0042] Figure 6 It is a layout schematic diagram of Embodiment 6 of the present invention.

[0043] Reference numerals: guiding device 1, rolling mill unit 2, shearing machine 3, coiling unit 4, metal strip 5, conveying roller table 6, traction roller 101, limiting plate 102, pinch roll at the inlet of the shearing machine 301, pinch roll at the outlet of the shearing machine 302, first coiling machine 401, second coiling machine 402. Detailed implementation manners

[0044] The following illustrates the implementation manners of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention schematically. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0045] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams rather than physical diagrams, and should not be construed as a limitation to the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, which does not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0046] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0047] Please refer to Figures 1 to 6 , a metal strip guiding device 1, which includes a guiding unit arranged on the upper side of the metal strip 5. The guiding unit includes a number of traction rollers 101 arranged at intervals. The traction rollers 101 are spaced a certain distance from the theoretical position of the metal strip 5 to allow the metal strip in the normal state to pass freely. The linear speed of the traction rollers 101 is not less than the production running speed of the metal strip 5 so that the warped metal strip can move forward and flatten under the traction of friction. The distance between the traction rollers 101 and the metal strip 5 is fixed or adjustable, preferably adjustable, to adjust the distance between the traction rollers 101 and the metal strip 5 according to the working conditions. In the non-working state, the traction rollers 101 are moved away from the metal strip 5 to reduce the adverse effects of heat radiation from the metal strip and extend its service life.

[0048] By arranging a guiding unit on the upper side of the metal strip 5 in the present invention and using the traction rollers of the guiding unit to pull the warped metal strip forward, the problems of the metal strip 5 such as levitation, stacking and winding caused by the speed difference between the head and the subsequent parts are solved. The head of the metal strip can quickly and successfully pass through the strip, reducing the production accidents and the downtime of the production line caused by threading the strip, improving the productivity of the production line, and reducing the loss of product rejection caused by production accidents, thereby improving the metal yield and comprehensively improving the production efficiency and economic benefits of the production line.

[0049] The guiding unit of the present invention and the theoretical position of the metal strip 5 can be arranged in parallel or in an inclined manner. And when arranged in an inclined manner, along the running direction of the metal strip, the distance between the guiding unit and the metal strip 5 gradually decreases. This arrangement not only allows the height at the inlet of the guiding unit to be made larger, which is beneficial to the passage of the metal strip, but also makes the metal strip at the outlet of the guiding unit relatively flat, which is beneficial to the subsequent threading process.

[0050] The guiding unit of the present invention can be a group or multiple groups arranged sequentially along the running direction of the metal strip, and the quantity is positively correlated with the running distance of the metal strip through the strip. Each guiding unit and the theoretical position of the metal strip 5 can be arranged in parallel or in an inclined manner.

[0051] One end or both ends of the traction roller 101 of the present invention extend out of the conveying roller path 6 of the metal strip and are supported on the traction roller bracket. The height of the traction roller bracket is adjustable and can be driven hydraulically or electrically. The rotation power source of the traction roller 101 drives the traction roller 101 to rotate regularly or irregularly. When the metal strip 5 contacts the traction roller 101, it can guide the metal strip 5 to advance along the production forward direction. The linear speed of the traction roller 101 is 1 to 2 times the production running speed of the metal strip 5, and the linear speed of the traction roller 101 is adjustable to adapt to different production requirements.

[0052] In order to prevent the metal strip from passing through between adjacent traction rollers, the present invention provides a limiting unit for restricting the position of the upturned metal strip. The limiting unit includes a limiting plate 102 located between the traction rollers 101. The distance between the limiting plate 102 and the traction roller 101 is less than the thickness of the metal strip 5, and the theoretical position distance between the limiting plate 102 and the metal strip 5 is not less than the theoretical position distance between the traction roller 101 and the metal strip 5. By arranging the limiting plate 102 between adjacent traction rollers, the metal strip 5 is restricted between the conveying roller path 6 and the limiting plate 102 in the height direction, reducing the instability of the metal strip transmission.

[0053] The surface of the limiting plate 102 of the present invention facing the metal strip 5 is smooth to reduce the friction with the metal strip 5. The theoretical position of the limiting plate 102 and the metal strip 5 can be arranged in parallel or obliquely; when arranged obliquely, along the running direction of the metal strip, the distance between the limiting plate 102 and the metal strip 5 gradually decreases. In this arrangement, the metal strip at the outlet of the guiding unit can be relatively flat, which is beneficial to the subsequent threading process. Each limiting plate can also be arranged horizontally, but along the running direction of the metal strip, the distance between the limiting plate and the metal strip gradually decreases. This arrangement can also make the metal strip at the outlet of the guiding unit relatively flat.

[0054] The limiting plates 102 of the present invention can be independent of each other. Each limiting plate is separately supported on the traction roller bracket, or can be connected to each other as a whole. For example, adjacent limiting plates 102 are connected as a whole through a connecting rod located on their side edges, and then installed on the traction roller bracket.

[0055] The projection of the longitudinal centerline of the guiding unit of the present invention on the conveying roller path 6 of the metal strip 5 should coincide with the longitudinal (metal strip running direction) centerline of the conveying roller path 6 of the metal strip 5, that is, the guiding unit is arranged directly above the conveying roller path 6 of the metal strip 5. In this arrangement, when the metal strip 5 is pulled by the guiding unit, the force is more stable. The projection of the centerline of the traction roller 101 on the conveying roller path 6 of the metal strip 5 can coincide with or be offset from the centerline of the conveying roller of the conveying roller path 6 of the metal strip 5. Preferably, it coincides with the centerline between two adjacent conveying rollers of the conveying roller path 6 of the metal strip 5. At this time, when the metal strip 5 collides with the upper guiding device 1, under the traction of the traction roller 101, the metal strip 5 advances along the extending direction of the limiting plate 102, which can avoid the problem of steel jamming caused by the metal strip 5 rebounding after hitting the conveying roller path 6 after falling.

[0056] The operating temperature of the metal strip guiding device 1 of the present invention is -20°C to 780°C, and the heat-resistant temperature of the traction roller 101 and the limiting plate 102 is not lower than 780°C.

[0057] A metal strip production line includes a slab rolling unit 2, a shearing machine 3, and a coiling unit 4 arranged in sequence along the rolling direction. The above-mentioned metal strip guiding device 1 is provided between the shearing machine 3 and the coiling unit 4. When there are multiple groups of guiding units of the metal strip guiding device, the distance between the limiting plate of the guiding unit close to the coiling unit 4 and the metal strip should gradually decrease, so that the metal strip at the outlet of the metal strip guiding device is relatively flat, which is beneficial to the threading process of the subsequent coiling unit 4.

[0058] During the production process of the metal strip, after the metal strip 5 is thinned by the final rolling mill, the metal strip 5 with qualified performance needs to be wound on the coiling unit 4. According to the principle of aerodynamics, when the metal strip 5 is in transportation, due to its own plate shape problems (such as warping), as well as external frictional force or wind resistance, the leading end will lift off, reducing the horizontal speed of the leading end. When the speed of the leading end is lower than the speed of the subsequent metal strip, it will cause lifting off, arching, and thus colliding with the surface traction transmission mechanism. To ensure that after the metal strip 5 is sheared by the shearing machine 3, the head can stably pass through the channel in front of the coiling unit 4 and reach the coiling unit 4, the present invention sets a metal strip guiding device 1 in the channel area. By providing a limiting effect and forward driving force through this metal strip guiding device 1, the speed of the head of the metal strip 5 is increased, avoiding problems such as the metal strip lifting off, stacking, and winding caused by the speed difference between the head and the subsequent parts, avoiding problems such as lifting off, stacking, and winding in the head area of the coil, and avoiding production accidents in the production line. The present invention can be applied to the short-process production process of metal strips and can also be used in the conventional process production of metal strips.

[0059] The conveyor roller path located below the metal strip can also be replaced by the structure of a metal strip guiding device with a limiting plate. At this time, the distance between the traction rollers located below the metal strip needs to be less than a set value, which is the minimum cantilever value to prevent the cantilever of the metal strip from sagging and getting stuck, so as to improve the stability of the metal strip transmission.

[0060] A method for producing a metal strip, in which the above-mentioned metal strip guiding device 1 is arranged between the shearing machine 3 and the coiling unit 4. When the metal strip 5 enters the shearing machine 3 through the inlet pinch roll 301 of the shearing machine and is sheared, before the leading end of the new metal strip reaches the outlet pinch roll 302 of the shearing machine, the metal strip guiding device 1 is pressed down to the working position to guide the leading end of the metal strip to run through the pinch roll of the coiling machine; when the threading is successful and the coiling machine establishes tension, the metal strip guiding device 1 is lifted to the standby position.

[0061] Example 1

[0062] As Figure 1 shown, a metal strip guiding device 1 is arranged between the outlet pinch roll 302 of the shearing machine and the coiling machine 401. The guiding unit located above the metal strip includes 10 traction rollers 101 and 11 limiting plates 102. Among them, the traction rollers 101 are externally connected to a motor for driving, and an internal cooling system is built inside the traction rollers 101 to ensure their normal operation. The horizontal distance between the traction rollers is 580 mm, the distance from the lowest point of the traction rollers to the metal strip is 40 mm, the 11 limiting plates 102 are all arranged at the same inclination angle, the horizontal inclination angle is 10°, the distance from the lowest point of each limiting plate to the lowest point of the traction rollers is 5 mm, below the metal strip is the conveyor roller path 6, and the traction rollers 101 and the conveyor rollers of the conveyor roller path 6 are located in the same vertical plane and the center lines are aligned. The thickness of the produced metal strip is 0.6 mm, the temperature of the metal strip is 650 °C, the width of the metal strip is 1300 mm, the running speed of the metal strip is 16.1 m / s, and the linear speed of the traction rollers is 16.905 m / s; the traction rollers and the limiting plates have the same width, which is 1450 mm.

[0063] After the shearing machine 3 shears the metal strip, the leading end starts to thread. The system sets the metal strip guiding device 1 to be adjusted in advance from the open standby position to the pressed working position to ensure the stable threading. After the threading is completed and the leading end is wound onto the reel of the first coiling machine 401, the metal strip guiding device 1 is lifted to the standby position through the action of the swing arm hydraulic cylinder to reduce the high-temperature baking from the metal strip.

[0064] Example 2

[0065] As Figure 2 shown, compared with Example 1, in Example 2, the center line of the traction rollers is aligned with the center line between two adjacent conveyor rollers of the conveyor roller path.

[0066] Example 3

[0067] As Figure 3 shown, compared with Embodiment 2, in Embodiment 3, each limiting plate is horizontally arranged, but the horizontal height gradually decreases from the inlet side to the outlet side of the guiding device 1, that is, the distance between the limiting plate and the metal strip gradually decreases. The distance at the inlet is 140 mm, and the distance at the outlet is 40 mm.

[0068] Embodiment 4

[0069] As Figure 4 shown, compared with Embodiment 1, in Embodiment 4, the metal strip is conveyed by using the structure of a metal strip guiding device with limiting plates, that is, the conveying roller path located below the metal strip is replaced by the structure of a metal strip guiding device with limiting plates, but the number of traction rollers and limiting plates of the lower guiding device is greater than that of the upper one. The purpose is to improve the supporting effect on the metal strip and avoid the steel strip being stuck between the roller paths.

[0070] Embodiment 5

[0071] As Figure 5 shown, compared with Embodiment 4, in Embodiment 5, the limiting plates located below the metal strip 5 are arranged obliquely.

[0072] Embodiment 6

[0073] As Figure 6 shown, compared with Embodiment 4, in Embodiment 6, a guiding device 1 is also arranged on the upper side of the metal strip 5 between the first coiler 401 and the second coiler 402.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A metal strip guiding device, characterized in that: It includes a guiding unit arranged on the upper side of the metal strip. The guiding unit includes a number of traction rollers arranged at intervals. The theoretical position of the traction rollers is spaced from the metal strip by a certain distance to allow the metal strip in the normal state to pass freely. The linear speed of the traction rollers is not less than the production running speed of the metal strip so that the upturned metal strip can move forward and flatten under the traction of friction. The distance between the traction rollers and the metal strip is fixed or adjustable. It further includes a limiting unit. The limiting unit includes a limiting plate located between the traction rollers. The distance between the limiting plate and the traction rollers is less than the thickness of the metal strip. The distance between the limiting plate and the theoretical position of the metal strip is not less than the distance between the traction rollers and the theoretical position of the metal strip. The limiting plate is arranged parallel or inclined to the theoretical position of the metal strip; when arranged inclinedly, along the running direction of the metal strip, the distance between the limiting plate and the metal strip gradually decreases.

2. A metal strip guiding device according to claim 1, characterized in that: The guiding unit is arranged parallel or inclined to the theoretical position of the metal strip; when arranged inclinedly, along the running direction of the metal strip, the distance between the guiding unit and the metal strip gradually decreases.

3. A metal strip guiding device according to claim 1, characterized in that: The guiding unit is in multiple groups and is arranged sequentially along the running direction of the metal strip.

4. A metal strip guiding device according to claim 3, characterized in that: Each guiding unit can be arranged parallel or inclined to the theoretical position of the metal strip; when arranged inclinedly, along the running direction of the metal strip, the distance between the guiding unit and the metal strip gradually decreases.

5. A metal strip guiding device according to claim 1, characterized in that: One end or both ends of the traction roller extend out of the conveying roller path of the metal strip and are supported on the traction roller bracket, and the height of the traction roller bracket is adjustable.

6. A metal strip guiding device according to claim 1, characterized in that: The linear speed of the traction roller is adjustable.

7. A metal strip guiding device according to claim 1, characterized in that: The linear speed of the traction roller is 1 to 2 times the production running speed of the metal strip.

8. A metal strip guiding device according to claim 1, characterized in that: Each limiting plate is arranged horizontally, and along the running direction of the metal strip, the distance between the limiting plate and the metal strip gradually decreases.

9. A metal strip guiding device according to claim 1, characterized in that: The side surface of the limiting plate facing the metal strip is smooth to reduce the friction with the metal strip.

10. A metal strip guiding device according to claim 1, characterized in that: The limiting plates are independent of each other, or adjacent limiting plates are connected into a whole by a connecting rod located on their side edges.

11. A metal strip guiding device according to claim 1, characterized in that: The projection of the longitudinal center line of the guiding unit on the conveying roller path of the metal strip coincides with the longitudinal center line of the conveying roller path of the metal strip.

12. The metal belt guiding device according to claim 1, characterized in that: The projection of the center line of the traction roller on the conveying roller path of the metal strip coincides with the center line of the conveying roller of the conveying roller path of the metal strip.

13. A metal strip guiding device according to claim 1, characterized in that: The projection of the center line of the traction roller on the conveying roller path of the metal strip coincides with the center line between two adjacent conveying rollers of the conveying roller path of the metal strip.

14. A metal strip production line, comprising a slab rolling unit, a shearing machine, and a coiling unit sequentially arranged along the rolling direction, characterized in that: A metal strip guiding device as described in any one of claims 1 to 13 is provided between the shearing machine and the coiling unit.

15. A metal strip production line according to claim 14, characterized in that: The coiling unit includes at least two coiling machines, and a metal strip guiding device is also provided between adjacent coiling machines.

16. A metal strip production line according to claim 14, characterized in that: When the guiding unit of the metal strip guiding device is in multiple groups, the distance between the limiting plate of the guiding unit close to the coiling unit and the metal strip gradually decreases.

17. A metal strip production line according to claim 14, characterized in that: The conveying roller path located under the metal strip is replaced by the structure of the metal strip guiding device with a limiting plate. At this time, the distance between the traction rollers located under the metal strip needs to be less than a set value, and this set value is the minimum cantilever value to prevent the metal strip cantilever from sagging and jamming.

18. A method for producing a metal strip, characterized in that: A metal strip guiding device as described in any one of claims 1 to 13 is arranged between the shearing machine and the coiling unit. After the shearing machine shears the metal strip, before the leading end of the new metal strip reaches the pinch rolls at the outlet of the shearing machine, the metal strip guiding device is pressed down to the working position to guide the leading end of the metal strip to run to the pinch rolls of the coiling unit for threading. After successful threading and when the coiling unit establishes tension, the metal strip guiding device is lifted to the standby position.

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