A method and device for preventing strip deviation in a pickling and rolling mill

Abstract

This invention discloses a method and device for preventing strip deviation in a pickling and straightening mill. Based on the wrap angle between the strip and each pickling and straightening squeeze roll, the unit tension exerted by each pickling and straightening squeeze roll on the strip is determined. The roll shape of each pickling and straightening squeeze roll in the pickling and straightening mill is set as a convex roll, with the diameter of the roll body at both ends being smaller than the diameter of the middle roll body. The pressure of the upper and lower pickling and straightening squeeze rolls when they are opened is set as the target pressure, and the target pressure is less than the maximum pressure between the upper and lower pickling and straightening squeeze rolls. Thus, by setting the unit tension of each pickling and straightening squeeze roll and optimizing the roll shape, strip deviation in the pickling tank is prevented, improving the overall operational stability of the mill and further reducing the failure rate of the pickling and straightening mill.

Description

Technical Field

[0001] This invention relates to the field of pickling and rolling mill technology, and in particular to a method and device for preventing strip deviation in pickling and rolling mills. Background Technology

[0002] Pickling and rolling mills are characterized by long production line layouts and complex equipment structures. Strip steel needs to pass through various types of rollers for turning and transport. When handling extremely thin raw materials, exceeding the mill's minimum thickness requirement and considering the low surface roughness of the strip, the strip is highly prone to deviation when passing through the rollers. Existing pickling and rolling mills use guide rollers to address this deviation issue. However, because the entire pickling and rolling mill line is quite long, with the pickling tank occupying nearly two-thirds of the line's length, even with pickling and guide rollers installed in the tank, strip deviation remains a significant risk in this section, leading to unstable production line operation.

[0003] Therefore, how to prevent the steel strip from deviating in the acid bath section is a problem we need to solve. Summary of the Invention

[0004] In view of the above problems, the present invention is proposed to provide a method and device for preventing strip deviance in acid continuous rolling mills, which solves the problem of frequent strip deviance in the production and manufacturing of ultra-thin raw materials, improves the stability of the unit operation, and provides technical support for reducing the failure rate of continuous rolling mills.

[0005] According to a first aspect of the present invention, a method for preventing strip misalignment in a pickling and rolling mill is provided, comprising:

[0006] The unit tension exerted on the strip by each pickling and straightening extrusion roll is determined based on the wrap angle between the strip and each pickling and straightening extrusion roll.

[0007] The roller type of each pickling and straightening extrusion roll in the pickling continuous rolling mill is set as a convex roll, and the diameter of the roll body at both ends of the convex roll is smaller than the diameter of the middle roll body;

[0008] Set the pressure of the upper and lower pickling and straightening extrusion rollers when they are turned on as the target pressure, and the target pressure is less than the maximum pressure between the upper and lower pickling and straightening extrusion rollers.

[0009] Optionally, based on the wrap angle between the strip and each pickling and straightening squeeze roll, the unit tension exerted by each pickling and straightening squeeze roll on the strip is determined, including:

[0010] If the wrap angle between the strip and the pickling and straightening extrusion roll is greater than 60 degrees, the unit tension exerted by the pickling and straightening extrusion roll on the strip is 16 N / mm2.

[0011] If the wrap angle between the strip and the pickling and straightening extrusion roll is between 45 and 60 degrees, then the unit tension exerted by the pickling and straightening extrusion roll on the strip is 10 N / mm2.

[0012] If the wrap angle between the strip and the pickling and straightening extrusion roll is less than 45 degrees, the unit tension exerted by the pickling and straightening extrusion roll on the strip is 8 N / mm2.

[0013] Optionally, the target pressure is half of the maximum pressure between the upper and lower pickling and correcting extrusion rollers.

[0014] Optionally, the difference between the diameter of the middle roll body and the diameter of the two end roll bodies of the convexity roll is the target difference value; the target difference value is the degree of deformation of the pickling and straightening squeezing roll when the pressure between the upper and lower pickling and straightening squeezing rolls is at its maximum.

[0015] Optionally, the method also includes:

[0016] The surface of tension roll No. 1 is roughened to increase its surface roughness; tension roll No. 1 is located between the uncoiler and the inlet looper.

[0017] Optionally, the surface roughness of the No. 1 tension roller is increased from Ra3.2±0.5 to Ra6.0±1.0.

[0018] According to a second aspect of the present invention, a strip steel anti-deviation device for a pickling and rolling mill is provided, comprising:

[0019] The tension determination module is used to determine the unit tension exerted on the strip by each pickling and straightening extrusion roll based on the wrap angle between the strip and each pickling and straightening extrusion roll.

[0020] The roller type determination module is used to set the roller type of each pickling correction and extrusion roller in the pickling continuous rolling mill to a convex roller, wherein the diameter of the roller body at both ends of the convex roller is smaller than the diameter of the middle roller body;

[0021] The pressure determination module is used to set the pressure of the upper and lower pickling and straightening extrusion rollers when they are turned on as the target pressure, and the target pressure is less than the maximum pressure between the upper and lower pickling and straightening extrusion rollers.

[0022] Optionally, the device also includes:

[0023] The texturing module is used to texturize the surface of tension roll No. 1, increasing the surface roughness of the roll; tension roll No. 1 is located between the uncoiler and the inlet looper.

[0024] According to a third aspect of the present invention, a control device is provided, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the aforementioned method for preventing strip deviation in a pickling and rolling mill.

[0025] According to a fourth aspect of the present invention, a pickling and rolling mill unit is provided, comprising at least a control device, an uncoiler, a No. 1 tension roll, an inlet looper, a pickling tank, and a plurality of pickling and straightening extrusion rolls disposed between the pickling tanks;

[0026] During the pickling and rolling process, the control equipment implements the aforementioned method for preventing strip deviation in the pickling and rolling mill, controlling the strip to pass through the uncoiler, No. 1 tension roll, inlet looper, pickling tank, and multiple pickling correction and squeezing rolls set between the pickling tanks.

[0027] The above-described one or more technical solutions in the embodiments of this specification have at least the following technical effects:

[0028] This specification provides a method and device for preventing strip deviation in a pickling and straightening mill. Based on the wrap angle between the strip and each pickling and straightening squeeze roll, the unit tension exerted by each pickling and straightening squeeze roll on the strip is determined. The roll type of each pickling and straightening squeeze roll in the pickling and straightening mill is set as a convex roll, with the diameter of the roll body at both ends being smaller than the diameter of the middle roll body. The pressure of the upper and lower pickling and straightening squeeze rolls when they are opened is set as the target pressure, and the target pressure is less than the maximum pressure between the upper and lower pickling and straightening squeeze rolls. Thus, by setting the unit tension of each pickling and straightening squeeze roll and optimizing the roll type, strip deviation in the pickling tank is prevented, improving the overall operational stability of the mill and further reducing the failure rate of the pickling and straightening mill.

[0029] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference figures denote the same parts throughout the drawings.

[0031] In the attached diagram:

[0032] Figure 1 A flowchart of a method for preventing strip deviation in a continuous acid rolling mill according to an embodiment of the present invention is shown.

[0033] Figure 2 A schematic diagram of a convex roller according to an embodiment of the present invention is shown.

[0034] Figure 3A block diagram of a strip steel anti-deviation device for a continuous acid rolling mill is shown in an embodiment of the present invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] The pickling and rolling mill is used for pickling and rolling strip steel. The pickling and rolling mill has numerous components; those relevant to this embodiment include at least control equipment, an uncoiler, a No. 1 tension roll, an inlet looper, pickling tanks, and multiple pickling correction and squeezing rolls positioned between the pickling tanks. The entire pickling and rolling mill production line is quite long, approximately 200 meters. The pickling tank section is about 120 meters long. The pickling tank section includes a rinsing tank, multiple pickling tanks, a dryer, and two sets of four-roll pickling correction and squeezing rolls. One set of pickling correction and squeezing rolls is positioned between the pickling tanks, and the other set is positioned between the rinsing tank and the dryer. These two sets of pickling correction and squeezing rolls are used to correct the strip steel's deviation. However, due to the long length of the pickling tank section, the strip steel is still prone to deviation even after passing through the two sets of pickling correction and squeezing rolls. Therefore, this embodiment proposes a method for preventing strip steel deviation in a pickling and rolling mill, specifically targeting the pickling tank section for strip steel correction.

[0040] Specifically, this embodiment provides a method for preventing strip deviation in a pickling and rolling mill, combined with... Figure 1 As shown, the method for preventing strip misalignment in this acid-rolling mill includes steps 101 to 103:

[0041] Step 101: Determine the unit tension of each pickling and straightening extrusion roll on the strip based on the wrap angle between the strip and each pickling and straightening extrusion roll.

[0042] In this embodiment, each set of pickling and straightening squeeze rolls includes four roll bodies, with the upper and lower rolls forming a pair. The strip steel passes through each pair of upper and lower pickling and straightening squeeze rolls. Hydraulic devices are installed at both ends of the pickling and straightening squeeze rolls to apply pressure towards the strip steel. As the strip steel passes through a pair of pickling and straightening squeeze rolls, the hydraulic devices squeeze the rolls towards the strip steel, causing the strip steel to contact the rolls and be subjected to pressure. The central angle corresponding to the arc of contact between the strip steel and the pickling and straightening squeeze rolls is the wrap angle. Based on the different wrap angles between the strip steel and each set of pickling and straightening squeeze rolls, the unit tension exerted by each roll on the strip steel is determined, thereby creating tension gradient control in the pickling tank section of the production line.

[0043] Specifically, based on statistical analysis of actual experiments, if the wrap angle between the strip and the pickling and straightening squeeze rolls is greater than 60 degrees, then the unit tension exerted by the pickling and straightening squeeze rolls on the strip is determined to be 16 N / mm. 2 ;

[0044] If the wrap angle between the strip and the pickling and straightening squeeze rolls is between 45 and 60 degrees, then the unit tension exerted by the pickling and straightening squeeze rolls on the strip is determined to be 10 N / mm. 2 ;

[0045] If the wrap angle between the strip and the pickling and straightening squeeze rolls is less than 45 degrees, then the unit tension exerted by the pickling and straightening squeeze rolls on the strip is determined to be 8 N / mm. 2 .

[0046] Thus, based on the material properties of ultra-thin strip steel, appropriately increasing the unit tension of the strip steel and increasing the longitudinal component of the strip steel running along the direction of the strip steel when passing through the roller can effectively suppress the strip steel deviation.

[0047] Step 102: Set the roller type of each pickling and straightening extrusion roller in the pickling continuous rolling mill to a convex roller, with the diameter of the roller body at both ends of the convex roller being smaller than the diameter of the middle roller body;

[0048] It should be noted that although the entire pickling and rolling mill has many rolls, such as tension rolls and straightening rolls, pickling straightening and squeezing rolls are only installed in the pickling tank section. In this embodiment, the pickling straightening and squeezing rolls in the pickling tank section are configured with a roller shape, while other straightening rolls in the pickling and rolling mill can use conventional roll bodies. Because in existing technology, multiple pairs of straightening rolls are installed on other production lines besides the pickling tank section, and each pair of straightening rolls is not far apart, the strip is less prone to deviation and exceeding requirements as it is in the pickling tank section. Strip deviation in other sections may also occur, but it is within acceptable limits.

[0049] Combination Figure 2 As shown, in this embodiment, the pickling correction and squeezing roll in the pickling tank section is configured as a convex roll. The diameter of the roll body at both ends of the convex roll is smaller than that of the middle roll body, resembling a spindle shape. Furthermore, the pickling correction and squeezing roll is made of rubber material, which deforms during extrusion. The traditional roll type is a common cylindrical flat roll. With this type of roll, wear occurs on both sides of the roll body near the ends at a certain distance towards the end of the steel passage, forming grooves. The middle section of the roll body plays a major role in correcting the strip alignment. When grooves form near the ends on both sides, it affects the transmission of pressure from the hydraulic equipment on both sides to the middle section.

[0050] In this embodiment, by changing the roller body from a flat roller to a convex roller, the pressure on the center line of the strip can be increased, thereby improving the correction effect of the pickling correction and squeezing roller and suppressing the strip deviation.

[0051] Optionally, the difference between the diameter of the middle roll body and the diameters of the two end roll bodies of the convexity roll is the target difference value; the target difference value is the degree of deformation of the pickling and straightening squeezing roll when the pressure between the upper and lower pickling and straightening squeezing rolls is at its maximum. Combined with... Figure 2 As shown, when the maximum pressure between the upper and lower pickling and straightening extrusion rollers is 0.6 MPa, the deformation degree of the rubber roller body is 3 mm. Then the diameter of the middle roller body of the convex roller is 350 mm, and the diameter of the roller bodies at both ends is 347 mm. The target difference of 3 mm between the diameter of the middle roller body and the diameter of the roller bodies at both ends is the degree of deformation.

[0052] Step 103: Set the pressure of the upper and lower pickling and straightening extrusion rollers when they are turned on to the target pressure, and the target pressure is less than the maximum pressure between the upper and lower pickling and straightening extrusion rollers.

[0053] In this embodiment, the maximum pressure between the upper and lower pickling and straightening squeeze rollers is 0.6 MPa. After the new rollers are installed, the pressure of the pickling and straightening squeeze rollers is reduced. Generally, the pressure of the upper and lower pickling and straightening squeeze rollers when they are turned on is set as the target pressure, which can be set to half of the maximum pressure, i.e., 0.3 MPa. As the steel throughput increases, the squeeze roller pressure can be gradually increased to the maximum of 0.6 MPa.

[0054] In one alternative implementation, the method further includes:

[0055] The surface roughness of tension roll No. 1 is increased by roughening the roll body surface. Tension roll No. 1 is located between the uncoiler and the inlet looper. The surface roughness of tension roll No. 1 is increased from Ra3.2±0.5 to Ra6.0±1.0.

[0056] It should be noted that the pickling and rolling mill has multiple tension rolls, with tension roll No. 1 located between the uncoiler and the inlet looper. The other tension rolls are all located after the inlet looper. Due to the low surface roughness of the extremely thin strip steel, roughening tension roll No. 1 increases the surface friction of the strip steel by 45%, significantly suppressing strip deviation.

[0057] In summary, the embodiments of this specification provide a method and device for preventing strip deviation in a pickling and straightening mill. Based on the wrap angle between the strip and each pickling and straightening squeeze roll, the unit tension exerted by each pickling and straightening squeeze roll on the strip is determined. The roll type of each pickling and straightening squeeze roll in the pickling and straightening mill is set as a convex roll, with the diameter of the roll body at both ends being smaller than the diameter of the middle roll body. The pressure of the upper and lower pickling and straightening squeeze rolls when they are opened is set as the target pressure, and the target pressure is less than the maximum pressure between the upper and lower pickling and straightening squeeze rolls. Thus, by setting the unit tension of each pickling and straightening squeeze roll and optimizing the roll type, strip deviation in the pickling tank is prevented, improving the overall operational stability of the mill and further reducing the failure rate of the pickling and straightening mill.

[0058] Based on the same inventive concept, combined with Figure 3 As shown, this embodiment also provides a strip steel anti-deviation device for a pickling and rolling mill, comprising:

[0059] The tension determination module is used to determine the unit tension exerted on the strip by each pickling and straightening extrusion roll based on the wrap angle between the strip and each pickling and straightening extrusion roll.

[0060] The roller type determination module is used to set the roller type of each pickling correction and extrusion roller in the pickling continuous rolling mill to a convex roller, wherein the diameter of the roller body at both ends of the convex roller is smaller than the diameter of the middle roller body;

[0061] The pressure determination module is used to set the pressure of the upper and lower pickling and straightening extrusion rollers when they are turned on as the target pressure, and the target pressure is less than the maximum pressure between the upper and lower pickling and straightening extrusion rollers.

[0062] In one alternative embodiment, the apparatus further includes a hairening module, which is used for:

[0063] The surface of tension roll No. 1 is roughened to increase its surface roughness; tension roll No. 1 is located between the uncoiler and the inlet looper. Optionally, the surface roughness of tension roll No. 1 is increased from Ra3.2±0.5 to Ra6.0±1.0.

[0064] In one alternative implementation, the tension determination module is further configured to:

[0065] If the wrap angle between the strip and the pickling and straightening extrusion roll is greater than 60 degrees, the unit tension exerted by the pickling and straightening extrusion roll on the strip is 16 N / mm2.

[0066] If the wrap angle between the strip and the pickling and straightening extrusion roll is between 45 and 60 degrees, then the unit tension exerted by the pickling and straightening extrusion roll on the strip is 10 N / mm2.

[0067] If the wrap angle between the strip and the pickling and straightening extrusion roll is less than 45 degrees, the unit tension exerted by the pickling and straightening extrusion roll on the strip is 8 N / mm2.

[0068] Optionally, the difference between the diameter of the middle roll body and the diameter of the two end roll bodies of the convexity roll is the target difference value; the target difference value is the degree of deformation of the pickling and straightening squeezing roll when the pressure between the upper and lower pickling and straightening squeezing rolls is at its maximum.

[0069] In summary, the embodiment of this specification provides a strip deviating prevention device for a pickling and straightening mill. Based on the wrap angle between the strip and each pickling and straightening squeeze roll, the unit tension exerted by each pickling and straightening squeeze roll on the strip is determined. The roll type of each pickling and straightening squeeze roll in the pickling and straightening mill is set as a convex roll, with the diameter of the roll body at both ends being smaller than the diameter of the middle roll body. The pressure of the upper and lower pickling and straightening squeeze rolls when they are opened is set as the target pressure, and the target pressure is less than the maximum pressure between the upper and lower pickling and straightening squeeze rolls. Thus, by setting the unit tension of each pickling and straightening squeeze roll and optimizing the roll type, strip deviating in the pickling tank section is prevented, improving the overall operational stability of the mill and further reducing the failure rate of the pickling and straightening mill.

[0070] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the strip anti-deviation device in the acid continuous rolling mill described above can be referred to the corresponding process in the aforementioned method, and will not be elaborated further here.

[0071] According to a third aspect of the present invention, a control device is provided, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the aforementioned method for preventing strip deviation in a pickling and rolling mill.

[0072] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the control device described above can be referred to the corresponding process in the aforementioned method, and will not be elaborated further here.

[0073] According to a fourth aspect of the present invention, a pickling and rolling mill unit is provided, comprising at least a control device, an uncoiler, a No. 1 tension roll, an inlet looper, a pickling tank, and a plurality of pickling and straightening extrusion rolls disposed between the pickling tanks;

[0074] During the pickling and rolling process, the control equipment implements the aforementioned method for preventing strip deviation in the pickling and rolling mill, controlling the strip to pass through the uncoiler, No. 1 tension roll, inlet looper, pickling tank, and multiple pickling correction and squeezing rolls set between the pickling tanks.

[0075] In detail, the continuous pickling and rolling mill has many components. According to the order in which the strip passes through the production line, it roughly includes the pickling unit and the rolling mill. The pickling unit includes an uncoiler, straightening machine, double shear, welding machine, No. 1 tension roll, No. 1 straightening roll, No. 2 straightening roll, inlet looper, No. 1 steering roll, No. 2 tension roll, tension leveler, No. 3 tension roll, pickling tank section, No. 4 tension roll, No. 4 straightening roll, No. 1 outlet looper, No. 2 steering roll, crescent shear, No. 6 straightening roll, edge trimming shear, deburring machine, No. 5 tension roll, No. 3 steering roll, No. 2 outlet looper, No. 7 straightening roll, No. 6 tension roll, No. 8 straightening roll, mill inlet hydraulic shear, and tension gauge roll.

[0076] In summary, the pickling and straightening squeezing rolls provided in this specification determine the unit tension exerted on the strip by each pickling and straightening squeezing roll based on the wrap angle between the strip and each pickling and straightening squeezing roll. The roll type of each pickling and straightening squeezing roll in the pickling and straightening roll unit is set as a convex roll, with the diameter of the roll body at both ends being smaller than the diameter of the middle roll body. The pressure of the upper and lower pickling and straightening squeezing rolls when they are opened is set as the target pressure, and the target pressure is less than the maximum pressure between the upper and lower pickling and straightening squeezing rolls. Thus, by setting the unit tension of each pickling and straightening squeezing roll and optimizing the roll type, strip deviation in the pickling tank is prevented, improving the overall operational stability of the unit and further reducing the failure rate of the pickling and straightening roll unit.

[0077] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the acid continuous rolling mill described above can be referred to the corresponding process in the aforementioned method, and will not be elaborated further here.

[0078] The above are merely various embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for preventing strip deviation in a pickling and rolling mill, characterized in that, include: The unit tension exerted by each pickling and straightening squeeze roll on the strip is determined based on the wrap angle between the strip and each pickling and straightening squeeze roll. The pickling and straightening squeeze roll is made of rubber. Determining the unit tension exerted by each pickling and straightening squeeze roll on the strip based on the wrap angle includes: If the included angle between the strip steel and the pickling deviation correction squeeze dry roller is greater than 60 degrees, the unit tension of the pickling deviation correction squeeze dry roller on the strip steel is 16 N / mm 2 ; If the wrap angle between the strip and the pickling and straightening extrusion roll is between 45 and 60 degrees, then the unit tension exerted by the pickling and straightening extrusion roll on the strip is 10 N / mm. 2 ; If the wrap angle between the strip and the pickling and straightening squeeze roll is less than 45 degrees, then the unit tension exerted by the pickling and straightening squeeze roll on the strip is 8 N / mm. 2 ; The roll type of each pickling and straightening extrusion roll in the pickling continuous rolling mill is set as a convex roll. The diameter of the roll body at both ends of the convex roll is smaller than the diameter of the middle roll body. The difference between the diameter of the middle roll body and the diameter of the roll body at both ends of the convex roll is the target difference value. The target difference value is the degree of deformation of the pickling and straightening extrusion roll when the pressure between the upper and lower pickling and straightening extrusion rolls is at its maximum. The pressure of the upper and lower pickling and straightening extrusion rollers when they are turned on is set as the target pressure, and the target pressure is less than the maximum pressure between the upper and lower pickling and straightening extrusion rollers.

2. The method according to claim 1, characterized in that, The target pressure is half of the maximum pressure between the upper and lower pickling and correcting extrusion rollers.

3. The method according to claim 1, characterized in that, The method further includes: The surface of tension roll No. 1 is roughened to increase its surface roughness; wherein tension roll No. 1 is located between the uncoiler and the inlet looper.

4. The method according to claim 3, characterized in that, The surface roughness of the No. 1 tension roller is increased from Ra3.2±0.5 to Ra6.0±1.

0.

5. A strip steel anti-deviation device for a continuous acid rolling mill, characterized in that, include: The tension determination module is used to determine the unit tension exerted by each pickling and straightening squeeze roll on the strip based on the wrap angle between the strip and each pickling and straightening squeeze roll. This determination includes: if the wrap angle between the strip and the pickling and straightening squeeze roll is greater than 60 degrees, then the unit tension exerted by the pickling and straightening squeeze roll on the strip is 16 N / mm. 2 If the wrap angle between the strip and the pickling and straightening squeeze roll is between 45 and 60 degrees, then the unit tension exerted by the pickling and straightening squeeze roll on the strip is 10 N / mm. 2 If the wrap angle between the strip and the pickling and straightening squeeze roll is less than 45 degrees, then the unit tension exerted by the pickling and straightening squeeze roll on the strip is 8 N / mm. 2 ; The roll type determination module is used to set the roll type of each pickling and straightening extrusion roll in the pickling continuous rolling mill to a convex roll. The diameter of the roll body at both ends of the convex roll is smaller than the diameter of the roll body in the middle. The difference between the diameter of the roll body in the middle and the diameter of the roll body at both ends of the convex roll is the target difference value. The target difference value is the degree of deformation of the pickling and straightening extrusion roll when the pressure between the upper and lower pickling and straightening extrusion rolls is at maximum. The pressure determination module is used to set the pressure of the upper and lower pickling and straightening extrusion rollers when they are turned on as the target pressure, and the target pressure is less than the maximum pressure between the upper and lower pickling and straightening extrusion rollers.

6. The apparatus according to claim 5, characterized in that, The device further includes: The texturing module is used to texturize the surface of tension roll No. 1 to increase the surface roughness of the roll body; wherein tension roll No. 1 is located between the uncoiler and the inlet looper.

7. A control device, characterized in that, The control device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the method for preventing strip deviation in the acid continuous rolling mill as described in any one of claims 1-4.

8. A continuous acid rolling mill unit, characterized in that, It includes at least a control device, an uncoiler, a No. 1 tension roll, an inlet looper, a pickling tank, and multiple pickling correction and squeezing rolls arranged between the pickling tanks. During the pickling and rolling process, the control equipment executes the strip anti-deviation method for the pickling continuous rolling mill as described in any of claims 1-4, controlling the strip to pass through the uncoiler, tension roll No. 1, inlet looper, pickling tank, and multiple pickling correction and squeezing rolls arranged between the pickling tanks.

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