CN116060459A

CN116060459A - Metal belt guiding device, metal belt production line and metal belt production method

Info

Publication number: CN116060459A
Application number: CN202310132164.9A
Authority: CN
Inventors: 王万慧; 韩会全; 方建忠; 杨春楣; 李旭久; 田小刚
Original assignee: CISDI Engineering Co Ltd; CISDI Research and Development Co Ltd
Current assignee: CISDI Engineering Co Ltd; CISDI Research and Development Co Ltd
Priority date: 2023-02-17
Filing date: 2023-02-17
Publication date: 2023-05-05

Abstract

The invention relates to a metal belt guiding device, a metal belt production line and a metal belt production method, which belong to the technical field of metal calendaring, wherein the metal belt guiding device is arranged between a shearing machine and a coiling machine set and comprises a guiding unit arranged at the upper side of a metal belt, the guiding unit comprises a plurality of traction rollers which are arranged at intervals, the traction rollers are spaced from the theoretical position of the metal belt by a certain distance so as to enable the metal belt in a normal state to freely pass, the linear speed of the traction rollers is not less than the production running speed of the metal belt so as to enable the upturned metal belt to be quickly flattened under the traction of friction force, the problems of empty, stacking, winding and the like of the metal belt caused by the speed difference between the head part and the subsequent part of the metal belt are solved, the head part of the metal belt can be quickly and successfully threaded, the production accident caused by the threading failure is reduced, the downtime of the production line is further reduced, the productivity of the production line is improved, and the waste loss of products caused by the production accident is reduced.

Description

Metal belt guiding device, metal belt production line and metal belt production method

Technical Field

The invention belongs to the technical field of metal calendaring, and relates to a metal belt guiding device, a metal belt production line and a metal belt production method.

Background

Short-flow continuous casting and rolling is a technology which is successfully developed in the last 80 th century, is a revolutionary technology in the field of ferrous metallurgy after converter steelmaking and full continuous casting, and leads the development direction of the steel manufacturing technology. The successful development of the method realizes the organic combination of the continuous casting and the hot continuous rolling of the thin-specification casting blank, and is a great breakthrough of the near-net-shape manufacturing technology. The short-process continuous casting and rolling production technology is very beneficial to the construction of an energy-saving and environment-friendly society, and is used as the development trend of future ferrous metallurgy technology, and compared with the traditional hot continuous rolling, the short-process continuous casting and rolling technology has the outstanding advantage that the short-process continuous casting and rolling technology can be used for producing thin-specification strip steel which is difficult to produce by the traditional hot continuous rolling. The method is beneficial to the headless or semi-headless production process of the short-flow continuous casting and rolling technology, avoids the threading process with the highest failure rate during single block rolling of conventional hot continuous rolling, and greatly improves rolling stability compared with conventional hot continuous rolling.

When the short-process continuous casting and rolling is used for headless or semi-headless production, the strip steel is cooled to reach the target temperature through laminar cooling control after passing through a finishing mill group, sheared by a shearing machine, and then is led into different coiling machines to realize high-speed coiling, and the head of the next coiled strip steel is operated to a coiling machine to be coiled through the shearing machine for threading and coiling. Because the production line of continuous casting and rolling with short process is characterized by the production of ultrathin specification strip steel, and with the continuous breakthrough of high-pulling-speed continuous casting technology in recent years, the production speed of the rolling line is continuously accelerated, and the problems of strip steel vacation, stacking, winding and the like are very easy to occur in the process of running the strip steel with thin specification to a coiling machine after the strip steel is sheared by a shearing machine, the production line is stopped due to accidents, and the economic benefit and the productivity are reduced.

Patent documents such as CN102421545A, CN1239447A, CN101678420A, CN1671491a propose respective solutions to this problem, but the problem is not effectively solved from the application effect point of view. In addition, with the progress of production technology, continuous casting billet pulling speed and thickness break through continuously, and the downstream market uses hot instead of cold trend to make higher demands on ultrathin and ultrathin products, the thickness of strip steel is continuously thinned, the production line speed is continuously increased, the problems of head vacation, stacking and winding during strip threading are increasingly outstanding, and the production line faults are increased, so that the method becomes a big bottleneck for restricting the efficient production of ultrathin strip steel.

The belt conveying technology is adopted to solve the problem, and although the problem in the high-speed threading process can be solved effectively in theory, the following problems exist in the practical application process due to the high-temperature environment characteristics of the problem: firstly, the common belt can not meet the high-temperature working requirement, and a belt made of high-temperature resistant materials is needed; secondly, although the high-temperature-resistant belt can meet the working requirements, the high-temperature-resistant belt is limited by the working time, the material loss is fast, and the use cost is high; again, the material properties (strength, stiffness, elasticity, ductility, etc.) of the high temperature resistant belt in a high temperature environment may change, degrading the operational stability of the system. For the above reasons, this technique also has a problem of difficulty in application implementation.

Disclosure of Invention

Accordingly, the present invention is directed to a metal strip guiding device, a metal strip production line and a metal strip production method, which solve the problems of emptying, stacking and winding of the metal strip caused by the speed difference between the head and the subsequent parts.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the metal belt guiding device comprises a guiding unit arranged at the upper side of a metal belt, wherein the guiding unit comprises a plurality of traction rollers which are arranged at intervals, the traction rollers are spaced from the theoretical position of the metal belt by a certain distance so as to enable the metal belt in a normal state to freely pass through, the linear speed of the traction rollers is not less than the production running speed of the metal belt so as to enable the upturned metal belt to move forwards and flatten under the traction of friction force, and the distance between the traction rollers and the metal belt is fixed or adjustable.

Optionally, the guiding units are arranged in parallel or inclined to the theoretical position of the metal strip; when arranged obliquely, the distance between the guide unit and the metal belt gradually decreases in the direction of travel of the metal belt.

Optionally, the guiding units are multiple groups, and are sequentially arranged along the moving direction of the metal belt.

Alternatively, each guide unit may be arranged in parallel or inclined to the theoretical position of the metal strip; when arranged obliquely, the distance between the guide unit and the metal belt gradually decreases in the direction of travel of the metal belt.

Optionally, one end or two ends of the traction roller extend out of the conveying roller way of the metal belt and are supported on a traction roller bracket, and the height of the traction roller bracket is adjustable.

Optionally, the linear speed of the pulling roll is adjustable.

Optionally, the linear speed of the pulling roll is 1-2 times the production running speed of the metal strip.

Optionally, the device further comprises a limiting unit, wherein the limiting unit comprises a limiting plate positioned between the traction rollers, the distance between the limiting plate and the traction rollers is smaller than the thickness of the metal belt, and the theoretical position distance between the limiting plate and the metal belt is not smaller than the theoretical position distance between the traction rollers and the metal belt.

Optionally, the limiting plate and the theoretical position of the metal belt are arranged in parallel or obliquely; when the metal strips are obliquely arranged, the distance between the limiting plate and the metal strips is gradually reduced along the moving direction of the metal strips.

Optionally, each limiting plate is horizontally arranged, and the distance between the limiting plate and the metal belt is gradually reduced along the moving direction of the metal belt.

Optionally, a side surface of the limiting plate facing the metal belt is smooth to reduce friction with the metal belt.

Alternatively, the limiting plates are independent from each other, or adjacent limiting plates are connected into a whole through connecting rods positioned at the side edges of the limiting plates.

Optionally, the projection of the longitudinal centre line of the guiding unit onto the roll table of the metal strip coincides with the longitudinal centre line of the roll table of the metal strip.

Optionally, the projection of the center line of the traction roller on the conveying roller way of the metal belt coincides with the center line of the conveying roller way of the metal belt.

Optionally, the projection of the center line of the traction roller on the conveying roller way of the metal belt coincides with the center line between two adjacent conveying rollers of the conveying roller way of the metal belt.

Optionally, the heat-resistant temperature of the traction roller and the limiting plate is not lower than 780 ℃.

The metal strip production line comprises a slab rolling unit, a shearing machine and a coiling unit which are sequentially arranged along the rolling direction, wherein the metal strip guiding device is arranged between the shearing machine and the coiling unit.

Optionally, the coiling unit comprises at least two coiling machines, and a metal belt guiding device is also arranged between the adjacent coiling machines.

Alternatively, when the guiding units of the metal strip guiding device are in a plurality of groups, the distance between the limiting plate of the guiding unit close to the coiling unit and the metal strip is gradually reduced.

Optionally, the roller conveyor at the lower side of the metal belt is replaced by a structure of a metal belt guiding device with a limiting plate, and the distance between the traction rollers at the lower side of the metal belt is smaller than a set value, wherein the set value is the minimum cantilever value for preventing the metal belt cantilever beam from sagging and blocking.

The metal belt guiding device is arranged between the shearing machine and the coiling machine set, and after the shearing machine shears the metal belt, the metal belt guiding device is pressed down to a working position before a new metal belt head reaches the outlet pinch roll of the shearing machine, so that the metal belt head is guided to move to the coiling machine pinch roll to penetrate the belt; when the threading is successful, after the coiling machine builds tension, the metal belt guiding device is lifted to the waiting position.

The invention has the beneficial effects that:

1. the problems of emptying, stacking, winding and the like of the metal belt caused by the speed difference between the head and the subsequent part of the metal belt are solved, the head of the metal belt can be rapidly and successfully penetrated, the production accidents caused by the penetrating failure are reduced, the downtime of the production line is further reduced, the productivity of the production line is improved, the product waste loss caused by the production accidents is reduced, the metal yield is improved, and the production efficiency and the economic benefit of the production line are comprehensively improved.

2. Compared with the existing belt traction technology, the belt traction device has the following beneficial effects:

1) The guiding unit and the limiting unit of the metal belt guiding device are rigidly connected, the rigidity of the whole device is higher, the deformation amount in working is small, and compared with the existing belt traction technology, the metal belt guiding device has higher mechanical structure stability and better production stability.

2) The guiding unit and the limiting unit of the metal belt guiding device can be manufactured by adopting low-cost heat-resistant steel, and compared with a belt traction technology adopting a high-temperature-resistant belt, the metal belt guiding device has the advantages that the raw material cost is lower, the service life of the heat-resistant steel is long, and therefore, the investment cost and the maintenance cost are reduced.

3) In the existing belt traction technology, if a small unit structure is adopted, the consumable materials of the high-temperature-resistant belt are increased, and if a large unit structure is adopted, the maintenance of the local damage condition is not facilitated, and the whole replacement is needed; the guiding unit and the limiting unit of the metal belt guiding device adopt small unit structures, so that the maintenance and the replacement after the partial damage are facilitated, and the maintenance cost is reduced.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.

Drawings

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:

FIG. 1 is a schematic layout of embodiment 1 of the present invention;

FIG. 2 is a schematic layout of embodiment 2 of the present invention;

FIG. 3 is a schematic layout of embodiment 3 of the present invention;

FIG. 4 is a schematic layout of embodiment 4 of the present invention;

FIG. 5 is a schematic view showing the arrangement of embodiment 5 of the present invention;

fig. 6 is a schematic layout of embodiment 6 of the present invention.

Reference numerals: the device comprises a guiding device 1, a rolling unit 2, a shearing machine 3, a coiling unit 4, a metal belt 5, a conveying roller way 6, a traction roller 101, a limiting plate 102, a shearing machine inlet pinch roller 301, a shearing machine outlet pinch roller 302, a first coiling machine 401 and a second coiling machine 402.

Detailed Description

Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.

Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numbers in the drawings of embodiments of the invention 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., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1 to 6, a metal belt guiding device 1 includes a guiding unit disposed on an upper side of a metal belt 5, the guiding unit includes a plurality of traction rollers 101 disposed at intervals, the traction rollers 101 are spaced from a theoretical position of the metal belt 5 by a certain distance so that the metal belt in a normal state freely passes, a linear speed of the traction rollers 101 is not less than a production running speed of the metal belt 5 so that the upturned metal belt is flattened forward under traction of friction force, and a distance between the traction rollers 101 and the metal belt 5 is fixed or adjustable, preferably adjustable, so as to adjust the distance between the traction rollers 101 and the metal belt 5 according to working conditions, and in a non-working state, the traction rollers 101 are far away from the metal belt 5, thereby reducing adverse effects of heat radiation from the metal belt and prolonging service life thereof.

According to the invention, the guide unit is arranged on the upper side of the metal belt 5, the upturned metal belt is pulled by the traction roller of the guide unit to move forwards, the problems of emptying, stacking, winding and the like of the metal belt caused by speed difference between the head and the subsequent part of the metal belt 5 are solved, the head of the metal belt can be rapidly and successfully penetrated, the production accidents caused by the penetrating belt and the downtime of the production line are reduced, the productivity of the production line is improved, the product waste loss caused by the production accidents is reduced, the metal yield is improved, and the production efficiency and the economic benefit of the production line are comprehensively improved.

The theoretical positions of the guide units and the metal strips 5 can be arranged in parallel or in an inclined manner, and when the guide units and the metal strips 5 are arranged in an inclined manner, the distance between the guide units and the metal strips 5 is gradually reduced along the moving direction of the metal strips.

The guiding units of the invention can be a group or a plurality of groups which are sequentially arranged along the moving direction of the metal belt, and the number and the moving distance of the metal belt are in positive correlation. Each guide unit may be arranged parallel to the theoretical position of the metal strip 5 or may be arranged obliquely.

One or both ends of the pull roll 101 of the present invention extend out of the roll table 6 of the metal strip and are supported on a pull roll stand, the height of which is adjustable, and which can be hydraulically or electrically driven. The rotation power source of the traction roller 101 drives the traction roller 101 to rotate regularly or irregularly, and when the metal belt 5 contacts the traction roller 101, the metal belt 5 can be guided to advance along the production direction. The linear speed of the traction roller 101 is 1-2 times of the production running speed of the metal belt 5, and the linear speed of the traction roller 101 can be adjusted to adapt to different production requirements.

In order to prevent the metal belt from penetrating out from between the adjacent traction rollers, the invention is provided with a limiting unit for limiting the position of the upturned metal belt, the limiting unit comprises a limiting plate 102 positioned between the traction rollers 101, the distance between the limiting plate 102 and the traction rollers 101 is smaller than the thickness of the metal belt 5, and the theoretical position distance between the limiting plate 102 and the metal belt 5 is not smaller than the theoretical position distance between the traction rollers 101 and the metal belt 5. According to the invention, the limiting plates 102 are arranged between the adjacent traction rollers, so that the metal belt 5 is limited between the conveying roller table 6 and the limiting plates 102 in the height direction, and the instability of metal belt transmission is reduced.

The limiting plate 102 of the invention is smooth towards one side surface of the metal belt 5 to reduce friction force with the metal belt 5, and the theoretical positions of the limiting plate 102 and the metal belt 5 can be arranged in parallel or obliquely; when the metal strips are obliquely arranged, the distance between the limiting plate 102 and the metal strips 5 is gradually reduced along the moving direction of the metal strips, and the metal strips at the outlet of the guiding unit can be leveled by the arrangement mode, so that the subsequent threading procedure is facilitated. Each limiting plate can be horizontally arranged, but the distance between the limiting plate and the metal belt is gradually reduced along the moving direction of the metal belt, and the metal belt at the outlet of the guiding unit can be flatter by the arrangement mode.

The limiting plates 102 of the present invention may be independent of each other, and each limiting plate may be supported on the pull roll support alone or may be connected to each other as a unit, for example, adjacent limiting plates 102 may be connected to each other as a unit by a connecting rod located at a side thereof, and then mounted on the pull roll support.

The projection of the longitudinal center line of the guiding unit on the conveying roller way 6 of the metal belt 5 is preferably coincident with the longitudinal (the moving direction of the metal belt) center line of the conveying roller way 6 of the metal belt 5, namely the guiding unit is arranged right above the conveying roller way 6 of the metal belt 5, and the arrangement mode can lead the stress of the metal belt 5 to be more stable when the metal belt 5 is pulled by the guiding unit. The projection of the center line of the traction roller 101 on the conveying roller way 6 of the metal belt 5 can be coincident with or staggered from the center line of the conveying roller way 6 of the metal belt 5, preferably coincident with the center line between two adjacent conveying rollers of the conveying roller way 6 of the metal belt 5, at this time, when the metal belt 5 collides with the upper guiding device 1, the metal belt 5 moves forward along the extending direction of the limiting plate 102 under the traction of the traction roller 101, so that the problem of steel clamping caused by rebound after the metal belt 5 falls down and impacts the conveying roller way 6 can be avoided.

The working temperature of the metal belt guiding device 1 is-20-780 ℃, and the heat-resistant temperature of the traction roller 101 and the limiting plate 102 is not lower than 780 ℃.

A metal strip production line comprising a slab rolling mill set 2, a shear 3 and a coiling set 4 arranged in sequence along the rolling direction, wherein the metal strip guiding device 1 is arranged between the shear 3 and the coiling set 4. When the guiding units of the metal belt guiding device are multiple groups, the distance between the limiting plate of the guiding unit close to the coiling unit 4 and the metal belt is preferably gradually reduced, so that the metal belt at the outlet of the metal belt guiding device is smoother, and the subsequent threading procedure of the coiling unit 4 is facilitated.

In the process of producing the metal strip, after the metal strip 5 is thinned by a final rolling mill, the metal strip 5 with qualified performance needs to be wound on a winding unit 4. According to aerodynamic principles, when the metal strip 5 is transported, due to its shape problems (such as warping) and external friction or wind resistance, the strip head will empty, so that the horizontal speed of the strip head part is reduced, and the strip head speed lower than the subsequent metal strip speed will cause empty and arching, so that the metal strip collides with the surface traction transmission mechanism. In order to ensure that the head of the metal belt 5 can stably pass through a channel in front of the coiling machine set 4 and reach the coiling machine set 4 after being sheared by the shearing machine 3, the metal belt guiding device 1 is arranged in the channel area, the limiting function and the advancing power are provided by the metal belt guiding device 1, so that the head speed of the metal belt 5 is increased, the problems of emptying, stacking, winding and the like of the metal belt caused by speed difference between the head and the subsequent part are avoided, the problems of emptying, stacking, winding and the like of the head area of the coil are avoided, and the production accidents of a production line are avoided. The invention can be applied to the short-flow production process of the metal belt and can also be applied to the conventional process production of the metal belt.

The conveying roller way at the lower side of the metal belt can be replaced by a structure of a metal belt guiding device with a limiting plate, and the distance between the traction rollers at the lower side of the metal belt is smaller than a set value, wherein the set value is the minimum cantilever value for preventing the cantilever beam of the metal belt from sagging and blocking, so that the stability of the metal belt transmission is improved.

In the metal strip production method, the metal strip guiding device 1 is arranged between the shearing machine 3 and the coiling machine set 4, when the metal strip 5 enters the shearing machine 3 through the inlet pinch roll 301 of the shearing machine to be sheared, the metal strip guiding device 1 is pressed down to a working position before a new metal strip head reaches the outlet pinch roll 302 of the shearing machine, and the metal strip head is guided to move to the coiling machine pinch roll to pass through the strip; when threading is successful, after the coiler builds up tension, the metal strip guide 1 is lifted to standby position.

Example 1

As shown in fig. 1, a metal strip guiding device 1 is arranged between a pinch roll 302 at an outlet of a shearing machine and a coiling machine 401, and a guiding unit at the upper side of a metal strip comprises 10 traction rolls 101 and 11 limiting plates 102, wherein the traction rolls 101 are externally connected with a motor for driving, and an internal cooling system is built in the traction rolls 101 so as to ensure the normal operation of the traction rolls. The horizontal distance between the traction rollers is 580mm, the distance between the lowest point of the traction rollers and the metal belt is 40mm,11 limiting plates 102 are all arranged at the same inclination angle, the horizontal inclination angle is 10 degrees, the distance between the lowest point of each limiting plate and the lowest point of the traction rollers is 5mm, a conveying roller way 6 is arranged below the metal belt, the traction rollers 101 and the conveying rollers of the conveying roller way 6 are positioned on the same vertical plane, and the center lines are aligned. The thickness of the produced metal belt is 0.6mm, the temperature of the metal belt is 650 ℃, the width of the metal belt is 1300mm, the running speed of the metal belt is 16.1m/s, and the linear speed of the traction roller is 16.905m/s; the traction roller and the limiting plate are the same in width and 1450mm in width.

When the shearing machine 3 shears the metal belt, the belt head starts to penetrate the belt, and the system sets the metal belt guiding device 1 to be adjusted from the opening standby position to the pressing working position in advance, so that the stable penetrating of the belt is ensured. After the threading is finished, the metal belt guiding device 1 is lifted to the standby position by the action of the swing arm hydraulic cylinder after the belt head is wound on the reel of the first coiling machine 401, and high-temperature baking of the metal belt is reduced.

Example 2

As shown in fig. 2, in example 2, the center line of the pulling roll is aligned with the center line between two adjacent conveying rolls of the conveying roller table, as compared with example 1.

Example 3

As shown in fig. 3, in example 3, each of the stopper plates is arranged horizontally, but the horizontal height gradually decreases from the inlet side of the guide device 1 to the outlet side thereof, that is, the distance between the stopper plate and the metal belt gradually decreases, the inlet distance is 140mm, and the outlet distance is 40mm, as compared with example 2.

Example 4

As shown in fig. 4, in example 4, compared with example 1, the metal belt is conveyed by adopting the structure of the metal belt guiding device with the limiting plate, namely, the conveying roller table positioned at the lower side of the metal belt is replaced by the structure of the metal belt guiding device with the limiting plate, but the number of the traction roller and the limiting plate of the lower guiding device is larger than that of the upper part, so that the supporting effect on the metal belt is improved, and the strip steel is prevented from being blocked between the roller tables.

Example 5

As shown in fig. 5, in example 5, compared with example 4, the stopper plate located on the lower side of the metal belt 5 is disposed obliquely.

Example 6

As shown in fig. 6, in embodiment 6, a guide device 1 is also provided on the upper side of the metal strip 5 between the first coiler 401 and the second coiler 402, as compared with embodiment 4.

Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.

Claims

1. A metal strap guide device, characterized by: the device comprises a guide unit arranged on the upper side of a metal belt, wherein the guide unit comprises a plurality of traction rollers which are arranged at intervals, the traction rollers are spaced from the theoretical position of the metal belt by a certain distance so that the metal belt in a normal state can freely pass through, 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 be forwards flattened under the traction of friction force, and the distance between the traction rollers and the metal belt is fixed or adjustable.

2. A metal strip guide as claimed in claim 1, wherein: the guiding units are arranged in parallel or obliquely with the theoretical positions of the metal strips; when arranged obliquely, the distance between the guide unit and the metal belt gradually decreases in the direction of travel of the metal belt.

3. A metal strip guide as claimed in claim 1, wherein: the guide units are multiple groups and are sequentially arranged along the moving direction of the metal belt.

4. A metal strip guide as claimed in claim 3, wherein: each guiding unit and the theoretical position of the metal belt can be arranged in parallel or obliquely; when arranged obliquely, the distance between the guide unit and the metal belt gradually decreases in the direction of travel of the metal belt.

5. A metal strip guide as claimed in claim 1, wherein: one end or two ends of the traction roller extend out of the conveying roller way of the metal belt and are supported on a traction roller bracket, and the height of the traction roller bracket is adjustable.

6. A metal strip guide as claimed in claim 1, wherein: the linear speed of the traction roller is adjustable.

7. A metal strip guide as claimed in claim 1, wherein: the linear speed of the traction roller is 1-2 times of the production running speed of the metal belt.

8. A metal strip guide as claimed in claim 1, wherein: the device further comprises a limiting unit, wherein the limiting unit comprises limiting plates positioned between the traction rollers, the distance between the limiting plates and the traction rollers is smaller than the thickness of the metal belt, and the theoretical position distance between the limiting plates and the metal belt is not smaller than the theoretical position distance between the traction rollers and the metal belt.

9. A metal strip guide as in claim 8 wherein: the limiting plates and the theoretical positions of the metal strips are arranged in parallel or obliquely; when the metal strips are obliquely arranged, the distance between the limiting plate and the metal strips is gradually reduced along the moving direction of the metal strips.

10. A metal strip guide as in claim 8 wherein: every limiting plate is the level and arranges, and takes the direction of going along the metal tape, and the distance between limiting plate and the strap reduces gradually.

11. A metal strip guide as in claim 8 wherein: the limiting plate is smooth towards one side surface of the metal belt so as to reduce friction force between the limiting plate and the metal belt.

12. A metal strip guide as in claim 8 wherein: the limiting plates are mutually independent, or the adjacent limiting plates are connected into a whole through connecting rods positioned at the side edges of the limiting plates.

13. A metal strip guide as claimed in claim 1, wherein: the projection of the longitudinal center line of the guiding unit on the conveying roller way of the metal belt coincides with the longitudinal center line of the conveying roller way of the metal belt.

14. A metal strip guide as claimed in claim 1, wherein: the projection of the central line of the traction roller on the conveying roller way of the metal belt is overlapped with the central line of the conveying roller way of the metal belt.

15. A metal strip guide as claimed in claim 1, wherein: the projection of the central line of the traction roller on the conveying roller way of the metal belt is overlapped with the central line between two adjacent conveying rollers of the conveying roller way of the metal belt.

16. The utility model provides a metal strip production line, includes slab rolling unit, cutter and the batch unit that sets up in order along the rolling direction, its characterized in that: a metal strip guide as claimed in any one of claims 1 to 15 arranged between the shears and the coiler.

17. A metal strip production line as in claim 16, wherein: the coiling unit comprises at least two coiling machines, and a metal belt guiding device is also arranged between the adjacent coiling machines.

18. A metal strip production line as in claim 16, wherein: when the guiding units of the metal belt guiding device are in a plurality of groups, the distance between the limiting plate of the guiding unit close to the coiling unit and the metal belt is gradually reduced.

19. A metal strip production line as in claim 16, wherein: the conveying roller table at the lower side of the metal belt is replaced by a structure of a metal belt guiding device with a limiting plate, and the distance between the traction rollers at the lower side of the metal belt is smaller than a set value, wherein the set value is the minimum cantilever value for preventing the metal belt cantilever beam from sagging and blocking.

20. A method of producing a metal strip, characterized by: providing a metal strip guiding device as claimed in any one of claims 1 to 15 between the shears and the coiler, wherein after the shears shear the metal strip, the metal strip guiding device is pressed down to a working position before a new metal strip head reaches the outlet pinch roll of the shears, and the metal strip head is guided to move to the coiler pinch roll for threading; when the threading is successful, after the coiling machine builds tension, the metal belt guiding device is lifted to the waiting position.