A method for threading cold-rolled strip steel

Abstract

This invention discloses a method for threading cold-rolled strip steel. After confirming that the strip head has a buckle, the steel coil is moved to the working position, and the pressure roller is pressed onto the steel coil. Then, the threading guide plate is unfolded, and the uncoiler is reversed until the strip head is moved to a position that can be placed on the threading guide plate. Then, the uncoiler is rotated forward to move the strip head onto the threading guide plate. After the inlet pinch roller presses down on the strip steel, the uncoiler is reversed to give the strip steel the required tension, and then the straightening machine is opened. Finally, the straightening machine is operated to press down on the strip steel, and the uncoiler is rotated forward and backward alternately until the buckle on the strip steel is flattened and eliminated, thus completing the threading operation. When processing high-strength steel, existing mechanical equipment is used to handle the buckle, ensuring that the strip head can be smoothly fed into the inlet pinch roller, improving the smoothness of automatic threading, replacing the manual intervention to eliminate defects, and ensuring threading efficiency and stable operation of the production line.

Description

Technical Field

[0001] This application relates to the field of metallurgical processing technology, and in particular to a method for threading cold-rolled strip steel. Background Technology

[0002] The information provided in this section is for the purpose of generally presenting the background of this disclosure. To the extent described in this section, the work of the currently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly considered to be prior art of this disclosure.

[0003] Currently, for high-strength steel with a yield strength greater than 650MPa, operators in continuous rolling mills face the following difficulties during the entry uncoiling and threading process: During the threading process, the excessive yield strength often causes elastic deformation of the strip head, resulting in the strip head being tightly attached to the outer ring of the steel coil after uncoiling. The opening angle of the strip head is insufficient, which affects the strip head's ability to be properly fed into the threading guide plate and the entry pinch roll, ultimately causing automatic threading to be obstructed, resulting in low threading efficiency and affecting the stable operation of the production line. Summary of the Invention

[0004] In view of the deficiencies in the existing technology, this application provides a method for threading cold-rolled strip steel to solve the problem of high difficulty and low efficiency in threading strip steel when buckles occur.

[0005] The above-mentioned objectives of the present invention are mainly achieved through the following technical solutions:

[0006] A method for threading cold-rolled strip steel, comprising:

[0007] Confirm that the strip head has a buckle;

[0008] The steel coil is moved to the working position, and the pressure roller is pressed onto the steel coil.

[0009] Unfold the threading guide plate and reverse the uncoiler until the tape head moves to a position where it can be placed on the threading guide plate.

[0010] Operate the uncoiler to rotate forward, and move the strip head to the threading guide plate. After confirming that the strip curvature meets the requirements for the strip head to enter the inlet pinch roll, operate the inlet pinch roll to press the strip.

[0011] After reversing the uncoiler to achieve the required tension in the strip, open the straightener and operate the straightener to press down on the strip. Alternate forward and reverse rotation with the uncoiler until the strip buckle is removed, and then the threading is complete.

[0012] Furthermore, if the opening angle between the strip head and the outer ring of the steel coil is less than 35°, and the extended length of the strip head after opening is less than 200mm or greater than 250mm, it is determined that the strip head has buckled.

[0013] Furthermore, the threading guide plate includes a first section and a second section that are movably connected, and the second section can be unfolded in a direction away from the inlet pinch roller, so that the distance between the edge of the second section and the steel coil is kept less than 0.5 mm before the belt head moves onto the threading guide plate.

[0014] Furthermore, after the tape head moves to the tape guide plate, the uncoiler is jogged to rotate forward until the distance between the tape head and the edge of the first section away from the second section is 450mm to 550mm, at which point the uncoiler stops and the second section is retracted.

[0015] Furthermore, before the strip is pressed by the inlet pinch roll, if there is a gap of more than 10mm between the bent portion of the strip and the threading guide plate, it is confirmed that the bending degree of the strip does not meet the requirements for entering the inlet pinch roll.

[0016] Furthermore, if it is confirmed that the strip curvature does not meet the requirements for entering the inlet pinch roll, the strip guide plate is raised to the highest position, the anti-wrinkle roller is pressed on the strip guide plate, and the uncoiler is rotated forward and backward until the anti-wrinkle roller is removed. The distance between the strip and the strip guide plate is not greater than 10mm.

[0017] Furthermore, after the belt head is moved to a position where it can be placed on the belt threading guide plate, the belt threading operation equipment is switched to maintenance mode.

[0018] Furthermore, switching to the maintenance mode requires that the previous steel coil has completed the shearing operation and the trolley that has completed the coil splicing is in the mandrel waiting position.

[0019] Furthermore, after the operating inlet pinch roll presses down on the strip, the maintenance mode is closed, and the operating anti-wrinkle roll and strip guide plate are retracted and separated from the strip.

[0020] Furthermore, the driving speed of the uncoiler is 30m / min. When operating the straightener to press down the strip, the uncoiler controls the strip head to enter the straightener 550-650mm, and then the straightener presses down. After feeding the strip for another 250-350mm, the uncoiler is reversed. After observing that the buckle has not been eliminated, the uncoiler is rotated forward again, and the insertion depth of the straightener is increased by 1.5-2.5mm to press down the strip until the buckle is eliminated and the insertion depth of the straightener is restored.

[0021] Compared with the prior art, the advantages of the present invention are as follows:

[0022] In practical application, after confirming the presence of a buckle on the strip head, the steel coil is moved to the working position, and the pressure roller is pressed onto the coil. Then, the threading guide plate is unfolded, and the uncoiler is reversed until the strip head is positioned to be placed on the threading guide plate. The uncoiler is then rotated forward to move the strip head onto the guide plate. After the inlet pinch roller presses down on the strip, the uncoiler is reversed to achieve the required tension before the straightening machine is opened. Finally, the straightening machine is used to press down on the strip, and the uncoiler is rotated alternately forward and backward until the buckle on the strip is flattened and eliminated, completing the threading operation. When processing high-strength steel, this invention uses existing mechanical equipment to handle buckles, ensuring the strip head can be smoothly fed into the inlet pinch roller, improving the smoothness of automatic threading, replacing manual intervention to eliminate defects, and ensuring threading efficiency and stable production line operation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A flowchart of the strap-threading method provided in the embodiments of this application;

[0025] Figure 2 This is a schematic diagram of the threading equipment provided in an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the threading guide plate after it has been unfolded, as provided in an embodiment of this application.

[0027] Figure 4 A schematic diagram showing the threading guide plate in its highest position according to an embodiment of this application;

[0028] In the diagram: 1. Anti-wrinkle roller; 2. Pressure roller; 3. Steel coil; 4. Uncoiler mandrel; 5. Threading guide plate; 6. Inlet pinch roller; 7. Straightening machine; 8. Grating; 9. Centering device; 10. Slitting shear inlet pinch roller; 11. Slitting shear; 12. Slitting shear outlet pinch roller; 13. Deflecting pinch roller; 14. Welding machine. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the description of these embodiments is intended to aid in understanding the invention, but does not constitute a limitation thereof. The specific structural and functional details disclosed herein are merely for describing exemplary embodiments of the invention. However, the invention can be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0030] like Figure 1-2 As shown, a method for threading cold-rolled strip steel includes:

[0031] The rolling process of high-strength steel with a yield strength greater than 650MPa in continuous rolling mills is a complex physical process. Factors such as the stress state, temperature distribution, and reduction settings of the strip can all cause the strip head to buckle. When the strip head buckles, it deforms, resulting in the strip head sticking tightly to the outer ring of the coil after uncoiling. The opening angle of the strip head is insufficient, making it difficult to maintain a suitable angle for entering the production line for processing. Therefore, it is necessary to confirm the presence of strip head buckles before operation. Specifically, operators can observe and determine whether a buckle has appeared at one end of the strip head. Once it is confirmed that a buckle has appeared, the cold-rolled strip threading method can be used to eliminate the buckle and continue the threading operation.

[0032] The steel coil 3 is moved to the working position, and the operating pressure roller 2 presses on the steel coil 3. The steel coil 3 is carried by the trolley to the working position. After the steel coil 3 is assembled with the uncoiler mandrel 4, the steel coil 3 and the uncoiler mandrel 4 rotate synchronously and can rotate under the drive of the uncoiler. Here, the forward rotation of the uncoiler is the uncoiling direction of the steel coil 3, and the reverse rotation of the uncoiler is the coiling direction of the steel coil 3. The operating pressure roller 2 presses on the steel coil 3 and applies pressure to the steel coil 3 to prevent the strip head from slipping off under gravity when the uncoiler reverses. This ensures that the uncoiler reverses and drives the strip head to stay stably in the target position, and also avoids the strip deviation caused by the strip deviation, thus improving the reliability of the strip threading.

[0033] Unfold the threading guide plate 5 and reverse the uncoiler until the strip head moves to a position where it can be placed on the threading guide plate 5. The threading guide plate 5 serves as a guide for the strip head. Before the strip head enters the inlet pinch roller 6, in order to ensure that the strip head can move smoothly onto the threading guide plate 5 under the forward rotation of the uncoiler, given that the initial position of the strip head of the steel coil 3 is uncertain, it is necessary to reverse the uncoiler and position the strip head. It should be noted that if the uncoiler is directly rotated forward here, the strip head will fall directly onto the working ground under the action of gravity, and the weight of the strip and the sharp edges make it inconvenient for operators to handle directly.

[0034] In actual operation, a reference plane is defined. When the reference plane is parallel to the end face of the steel coil 3 and the feeding direction of the steel coil 3 is from left to right, when the threading guide plate 5 is unfolded, the end of the threading guide plate 5 near the steel coil 3 can be extended to the o'clock position of the steel coil 3 in the reference plane. At this time, the uncoiler is reversed until the strip head moves to the area between the eleven o'clock and one o'clock directions in the reference plane. This ensures that the strip head moves to a position that can be placed on the threading guide plate 5, avoiding the strip head being under the unfolded threading guide plate 5, which would affect the smooth movement of the strip head onto the threading guide plate 5.

[0035] Operate the uncoiler to rotate forward, and move the strip head onto the threading guide plate 5. After confirming that the strip curvature meets the requirement of 0 and the strip head reaches the requirement of entering the inlet pinch roller 6, operate the inlet pinch roller 6 to press the strip.

[0036] After reversing the uncoiler to achieve the required tension in the strip, open the straightener 7. Operate the straightener 7 to press down on the strip, and alternately reverse the uncoiler in both directions until the strip buckle is removed, thus completing the threading process. Specifically, feed the strip into the straightener 7, press down on the strip using the straightener 7, and then open the straightener.

[0037] Machine 7 drives the uncoiler to reverse, the strip is returned and the buckle is observed to see if it is eliminated. If the buckle is still present, the strip is fed into the straightening machine 7 again and the straightening machine 7 is operated to press again. After each pressing, the observation is made until the buckle is eliminated. In the subsequent strip feeding process, the strip head can pass smoothly through the centering device 9, the shear inlet pinch roller 10, the slitting shear 11, the shear outlet pinch roller 12, the turning pinch roller 13 and the welding machine 14, which improves the stability and reliability of the entire processing operation and avoids the need for manual intervention to correct deviation at different operating positions.

[0038] The working principle of this embodiment is as follows: In actual application, after confirming that the strip head has a buckle, the steel coil 3 is moved to the working position, and the pressure roller 2 is pressed onto the steel coil 3. Then, the threading guide plate 5 is unfolded, and the uncoiler is reversed until the strip head is moved to a position where it can be placed on the threading guide plate 5. Then, the uncoiler is rotated forward to move the strip head onto the threading guide plate 5.

[0039] After the pinch roll 6 presses down on the strip, the uncoiler is reversed to bring the strip to the required tension. Then, the straightener 7 is opened, and finally, the straightener 7 is operated to press down on the strip, while the uncoiler alternates between forward and reverse rotation until...

[0040] After the buckles on the strip are flattened and removed, the strip threading operation is completed. When operating high-strength steel, existing mechanical equipment is used to process the buckles, ensuring that the strip head can be smoothly fed into the inlet pinch roller 6, improving the smoothness of automatic strip threading, replacing the manual intervention to eliminate defects, and ensuring the efficiency of strip threading and the stable operation of the production line.

[0041] Furthermore, based on the above embodiments, when the opening angle between the strip head and the outer ring of the steel coil 3 is less than 35°, and the extension length of the strip head after opening is less than 200mm or greater than 250mm, it is determined that the strip head has a buckle. Before each steel coil 3 is threaded, the standard is used to measure whether the strip head has a buckle to improve the consistency of the judgment. In order to improve the efficiency of determining the buckle, a triangular plate with a 35° angle can be directly made, which can directly obtain the opening angle between the strip head and the outer ring of the steel coil 3, and can quickly compare the extension length of the strip head after opening.

[0042] like Figure 2-3 As shown, further, based on the above embodiment, the threading guide 5 includes a first section and a second section that are movably connected. The second section can be unfolded in a direction away from the inlet pinch roller 6. Before the strip head moves onto the threading guide 5, the distance between the edge of the second section and the steel coil 3 is kept less than 0.5 mm. The distance between the edge of the second section and the steel coil 3 is controlled so that the strip head can move onto the threading guide 5 under the drive of the forward rotation of the uncoiler without manual traction. The second section can be unfolded relative to the first section to adjust the distance between the second section and the outer ring of the steel coil 3 according to different specifications of the steel coil 3, thereby improving applicability. When the threading guide 5 needs to change its tilt angle, it is convenient to keep the second section from spatially interfering with the steel coil 3 by moving it, thereby improving operational feasibility.

[0043] Furthermore, based on the above embodiments, after the strip head moves onto the threading guide plate 5, the uncoiler is jogged to rotate forward until the distance between the strip head and the edge of the first section away from the second section is 450mm to 550mm. The uncoiler is then stopped and the second section is retracted. The uncoiler is jogged to rotate forward to facilitate control of the relative position of the strip head. After adjusting the position of the strip head, the second section is retracted to complete the uncoiling operation.

[0044] Furthermore, based on the above embodiments, before the strip is pressed by the inlet pinch roller 6, if there is a gap greater than 10mm between the bent portion of the strip and the threading guide plate 5, it is confirmed that the bending degree of the strip does not meet the requirements for entering the inlet pinch roller 6. Then, by observing the smoothness of the strip head entering the inlet pinch roller 6, the smoothness of the strip head in the subsequent working position can be judged. When the strip head cannot smoothly enter the inlet pinch roller 6, it is necessary to process the strip head before continuing the operation.

[0045] like Figure 4 As shown, further, based on the above embodiment, when it is confirmed that the strip curvature does not meet the requirements for entering the inlet pinch roll 6, the strip guide plate 5 is raised to its highest position, the anti-wrinkle roller 1 is pressed on the strip guide plate 5, and the uncoiler is rotated forward and backward until the anti-wrinkle roller 1 is removed. The distance between the strip and the strip guide plate 5 is no more than 10mm. The strip is supported by the strip guide plate 5, and the anti-wrinkle roller 1 is used to press down on the strip on the strip guide plate 5. The forward and reverse rotation of the uncoiler is used until the curved part at the strip head is deformed by the anti-wrinkle roller 1 until the distance between the strip and the strip guide plate 5 is no more than 10mm, that is, the strip is deformed to reduce the curvature. Under the drive of the uncoiler, the strip head can smoothly enter the inlet pinch roll 6, effectively avoiding the problem that the strip head is too curved to enter the inlet pinch roll 6, and maintaining the smooth progress of the operation.

[0046] Furthermore, based on the above embodiments, after the belt head is moved to a position where it can be placed on the belt threading guide plate 5, the belt threading operation equipment is switched to maintenance mode. After the maintenance mode is activated, the interlocking protection between the equipment is lost. When the belt threading operation equipment is in maintenance mode, the limit control between the equipment is released, so that a single piece of equipment can be stopped at a designated position, which facilitates subsequent operation of a single piece of equipment.

[0047] Furthermore, based on the above embodiments, in order to maintain the effectiveness and reliability of the strip threading equipment when switching to the maintenance mode, the following constraints can be imposed to ensure that the switching to the maintenance mode meets the following requirements: the previous steel coil 3 has completed the shearing operation and the trolley that has completed the coiling is located at the mandrel waiting position. Specifically, after the tail of the previous strip steel is cut by the slitting shear 11, it will be divided into two parts. One part can wait at the welding machine 14 to be welded to the strip head of the subsequent steel coil 3, and the other part is removed into the waste hopper by the turning pinch roller 13 after passing through the shear exit pinch roller 12. In addition, the steel coil 3 trolley needs to stop at the mandrel waiting position after receiving the coil from the shuttle car, so as to ensure that the equipment can be smoothly switched to the maintenance mode.

[0048] Furthermore, based on the above embodiments, after the inlet pinch roller 6 presses down on the strip, the maintenance mode is closed, the anti-wrinkle roller 1 and the threading guide plate 5 are retracted and separated from the strip, the maintenance mode is closed to prepare for the threading operation, and the anti-wrinkle roller 1 and the threading guide plate 5 are retracted to keep them separated from the strip and maintain the stability of the subsequent continuous processing of the strip.

[0049] Furthermore, based on the above embodiment, the driving speed of the uncoiler is 30m / min. When the straightener 7 is operated to press down the strip, the uncoiler is operated to control the strip head to enter the straightener 7 550-650mm. After the straightener 7 presses down, the strip is fed for another 250-350mm. Then the uncoiler is operated to reverse. After observing that the buckle has not been eliminated, the uncoiler is operated to rotate forward again, and the insertion amount of the straightener 7 is increased by 1.5-2.5mm to press down the strip until the buckle is eliminated and the insertion amount of the straightener 7 is restored.

[0050] It should be understood that the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. Although the terms "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit, without departing from the scope of the exemplary embodiments of the invention.

[0051] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0052] It should be understood that in the description of this invention, the terms "upper," "vertical," "inner," "outer," etc., indicate the orientation or positional relationship as commonly placed when the disclosed product is used, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0053] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" 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 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.

[0054] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the invention. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” “containing,” and / or “including” as used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, and do not exclude the presence or addition of one or more other features, quantities, steps, operations, units, components, and / or combinations thereof.

[0055] Specific details are provided in the following description to provide a complete understanding of the exemplary embodiments. However, those skilled in the art will understand that the exemplary embodiments can be implemented without these specific details. In other embodiments, well-known processes, structures, and techniques may be omitted in the depiction of non-essential details to avoid obscuring the exemplary embodiments.

[0056] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

[0057] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art.

Claims

1. A method of threading a cold-rolled strip, characterized in that, It comprises: Confirming the occurrence of the buckle of the strip head of the strip steel; The coil moves to the working position, and the operation pressure roller is pressed on the coil; The uncoiling guide plate is unfolded, the uncoiler is reversed, and the strip head is moved to a position where it can be placed on the uncoiling guide plate. After the strip head is moved to a position where it can be placed on the uncoiling guide plate, the threading operation equipment is switched to the maintenance mode; The uncoiler is operated to rotate forward, the strip head is moved to the uncoiling guide plate, and the entry pinch roll is operated to press the strip steel after confirming that the bending degree of the strip steel meets the requirement of the strip head entering the entry pinch roll. Before the strip steel is pressed by the entry pinch roll, when the gap between the bending part of the strip steel and the uncoiling guide plate is greater than 10mm, it is confirmed that the bending degree of the strip steel does not meet the requirement of entering the entry pinch roll. When it is confirmed that the bending degree of the strip steel does not meet the requirement of entering the entry pinch roll, the uncoiling guide plate is operated to be lifted to the highest position, the anti-wrinkle roller is operated to press the strip steel on the uncoiling guide plate, and the uncoiler is operated to reverse after the anti-wrinkle roller is removed. The distance between the strip steel and the uncoiling guide plate is not greater than 10mm. After the entry pinch roll is operated to press the strip steel, the maintenance mode is closed, and the anti-wrinkle roller and the uncoiling guide plate are operated to be retracted and separated from the strip steel; The uncoiler is operated to reverse to make the strip steel have a required tension, the straightening machine is opened, the straightening machine is operated to press the strip steel, and the uncoiler is alternately operated to rotate forward and reverse until the buckle of the strip head is eliminated and the threading is completed.

2. The cold-rolled strip steel threading method of claim 1, wherein: When the opening angle between the strip head and the outer ring of the coil is less than 35°, and the extension length after the strip head is opened is less than 200mm or greater than 250mm, it is determined that the strip head has a buckle.

3. The cold-rolled strip steel threading method of claim 1, wherein: The uncoiling guide plate comprises a first segment and a second segment connected movably, and the second segment can be unfolded towards the direction away from the entry pinch roll. Before the strip head is moved to the uncoiling guide plate, the distance between the edge of the second segment and the coil is kept to be less than 0.5mm.

4. The cold-rolled strip steel threading method of claim 3, wherein: After the strip head is moved to the uncoiling guide plate, the uncoiler is jogged to rotate forward until the distance between the strip head and the edge of the second segment away from the first segment is 450mm-550mm, the uncoiler is stopped, and the second segment is retracted.

5. The cold-rolled strip steel threading method of claim 1, wherein: Switching to the maintenance mode needs to meet the following conditions: the previous coil completes the shearing operation and the trolley for completing the coil winding is located at the mandrel waiting position.

6. The cold-rolled strip steel threading method of claim 1, wherein: The driving speed of the uncoiler is 30m / min. When the straightening machine is operated to press the strip steel, the uncoiler is operated to control the strip head to enter the straightening machine by 550-650mm, the straightening machine is pressed down, the strip is continuously fed by 250-350mm, the uncoiler is reversed, and the straightening machine is operated to rotate forward again and the insertion amount of the straightening machine is increased by 1.5-2.5mm for pressing the strip steel. The operation is continued until the buckle is eliminated and the insertion amount of the straightening machine is restored.

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