Control method and device for cold rolling and recoiling unit

Abstract

Embodiments of the present application provide a control method and device of a cold rolling recoiling unit, the cold rolling recoiling unit comprising a flying shear, a deviation rectifying device, a shielding piece, and a centering detection device provided with a light beam emitter, the shielding piece being used for shielding the light beam emitted by the light beam emitter, the method comprising: in response to a strip head of a strip steel reaching a set position, controlling the shielding piece to move to one side of the strip steel to expose a preset width on the side, an actual defect width of the one side of the strip steel being greater than an actual defect width of the other side of the strip steel; acquiring a centering center line determined by the centering detection device based on a width of the strip steel and the preset width; and controlling the deviation rectifying device to rectify the strip steel according to the centering center line, so that the flying shear performs asymmetric edge cutting on the two sides of the strip steel. The technical solution provided by the embodiments of the present application can realize asymmetric edge cutting of the strip steel, thereby improving the yield of the strip steel.

Description

Technical Field

[0001] This application relates to the field of metallurgical technology, and more specifically, to a control method and apparatus for a cold rolling rewinding mill. Background Technology

[0002] In the cold-rolled recoiling production field, disc shears use a symmetrical trimming method to trim both sides of the strip steel, that is, removing the waste material on both sides of the strip steel with equal removal amounts. Although this trimming method can ensure trimming quality within the precision range of the disc shear, it has the following drawbacks: When a quality defect occurs on one side of the strip steel and needs to be removed, while the other side of the strip steel has good quality, the waste removal amount needs to be set according to the width of the defective edge. Because it is a symmetrical trimming method, the other side of the strip steel is also trimmed with the same waste edge width. This will cause the side without quality problems to be unnecessarily cut off, resulting in a loss of strip steel yield. Summary of the Invention

[0003] The embodiments of this application provide a control method and apparatus for a cold rolling recoiling mill. Based on the technical solution provided in this application, asymmetrical edge trimming of strip steel can be achieved, thereby improving the strip steel yield.

[0004] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0005] According to a first aspect of the present application, a control method for a cold-rolled recoiling mill is provided. The cold-rolled recoiling mill includes a disc shear, a correction device, a shielding plate, and a centering detection device equipped with a beam emitter. The shielding plate is used to block the beam emitted by the beam emitter. The method includes: in response to the strip head reaching a set position, controlling the shielding plate to move to the other side of the strip to expose a preset width on that side, wherein the actual defect width on one side of the strip is greater than the actual defect width on the other side of the strip; acquiring a centering centerline determined by the centering detection device based on the width of the strip and the preset width; and controlling the correction device to correct the strip according to the centering centerline so that the disc shear performs asymmetrical edge cutting on both sides of the strip.

[0006] In some embodiments of this application, based on the foregoing scheme, the set position is located between the centering detection device and the disc shear.

[0007] In some embodiments of this application, based on the aforementioned scheme, the distance between the set position and the centering detection device is 200-500mm.

[0008] In some embodiments of this application, based on the foregoing scheme, the cold rolling recoiling mill further includes a transmission mechanism, the centering detection device includes a grating frame, and controlling the blocking plate to move to the other side of the strip to expose a preset width on that side includes: controlling the transmission mechanism to pull the blocking plate from an initial position to move to the other side of the strip, the initial position being set on the grating frame and outside the detection range corresponding to the light beam; when the width of the blocking plate exposed on that side is detected to be the preset width, controlling the transmission mechanism to stop pulling.

[0009] In some embodiments of this application, based on the foregoing scheme, the length of the shielding plate is greater than the detection length corresponding to the light beam, the width of the shielding plate is greater than half of the maximum cutting edge width of the disc shear, and the shielding plate is made of an opaque material.

[0010] In some embodiments of this application, based on the foregoing scheme, the method further includes: adjusting the actual defect width on one side of the strip to obtain a first reference defect width, and adjusting the actual defect width on the other side of the strip to obtain a second reference defect width, wherein the second reference defect width is smaller than the first reference defect width; and using the sum of the first reference defect width and the second reference defect width as the cutting edge width of the disc shear.

[0011] In some embodiments of this application, based on the foregoing scheme, adjusting the actual defect width on the other side of the strip to obtain a second reference defect width includes: if the actual defect width on the other side of the strip is 0, then setting a defect width as the second reference defect width, wherein the set defect width is greater than 0.

[0012] In some embodiments of this application, based on the foregoing scheme, the method further includes: calculating the difference between the first reference defect width and the second defect width to obtain the preset width.

[0013] In some embodiments of this application, based on the foregoing scheme, before controlling the shielding piece to move to the other side of the strip, the method further includes: controlling the strip to stop moving; after controlling the shielding piece to move to the other side of the strip to expose a preset width on that side, the method further includes: controlling the strip to continue moving.

[0014] According to a second aspect of the embodiments of this application, a control device for a cold rolling recoiling mill is provided. The cold rolling recoiling mill includes a disc shear, a correction device, a shielding plate, and a centering detection device equipped with a beam emitter. The shielding plate is used to shield the beam emitted by the beam emitter. The device includes: a first control unit, configured to control the shielding plate to move to the other side of the strip in response to the strip head reaching a set position, so as to expose a preset width on that side, wherein the actual defect width on one side of the strip is greater than the actual defect width on the other side of the strip; an acquisition unit, configured to acquire a centering centerline determined by the centering detection device based on the width of the strip and the preset width; and a second control unit, configured to control the correction device to correct the strip according to the centering centerline, so that the disc shear performs asymmetrical edge cutting on both sides of the strip.

[0015] The technical solution of this application, in the field of cold-rolled recoiling production, involves using a disc shear to remove defects on the side of the strip. By exposing a pre-defined width of shielding plate on the side of the strip with the larger actual defect width, the centering detection device identifies the centering line based on the pre-defined width of the shielding plate and the width of the strip. Consequently, the correction device does not correct the strip according to the shearing center line of the disc shear, but rather according to the centering center line obtained by the centering detection device. This ensures that when the strip reaches the disc shear, its center line does not coincide with the shearing line, preventing the disc shear from symmetrically cutting the strip on both sides. Instead, it enables asymmetrical cutting, meaning the amount of strip removed by the disc shear on both sides is unequal, thereby reducing the amount of qualified strip removed and improving the strip yield.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 A front view of a cold rolling rewinding mill unit according to an embodiment of this application is shown; Figure 2 A top view of a cold rolling rewinding mill unit according to an embodiment of this application is shown; Figure 3 A schematic flowchart of a control method for a cold rolling rewinding mill according to an embodiment of this application is shown; Figure 4 A detailed flowchart illustrating the process of determining the cutting edge width of a disc shear according to one embodiment of this application is shown. Figure 5 A block diagram of a control device for a cold rolling rewinding mill according to an embodiment of this application is shown. Detailed Implementation

[0018] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0019] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0020] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0021] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0022] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0024] To enable those skilled in the art to better understand the embodiments of this application, the following description is provided in conjunction with... Figure 1 and Figure 2 The structure of the cold rolling rewinding unit in some embodiments of this application is described.

[0025] See Figure 1 A front view of a cold rolling rewinding mill unit according to an embodiment of this application is shown; and see also... Figure 2 The image shows a top view of a cold rolling rewinding mill unit according to an embodiment of this application.

[0026] In this application, the cold rolling rewinding unit includes a disc shear 2, a correction device, and an alignment detection device equipped with a beam emitter 9.

[0027] In some embodiments, the correction device includes a correction roller 1.

[0028] In some embodiments, the alignment detection device further includes a grating frame 5 and a CPC grating 4.

[0029] The grating frame 5 is rectangular in shape. The CPC grating 4 is disposed on the upper side of the grating frame 5, and the beam emitter 9 is disposed on the lower side of the grating frame 5, opposite to the CPC grating 4.

[0030] In the alignment detection device, beam emitter 9 emits a beam to CPC grating 4, and CPC grating 4 receives the beam signal emitted by beam emitter 9. When the strip passes through the grating frame 5, the strip can block the beam emitted by beam emitter 9, thereby enabling the alignment detection device to detect the width of the passing strip.

[0031] In some embodiments, the cold rolling recoiling mill also includes a guide plate 2, idler rollers 8, and a disc shear 3.

[0032] At present, the strip steel 10 passing through the straightening roller 1 is guided by the guide plate 2, passes through the centering detection device and the idler roller 8 in sequence, and finally reaches the disc shear 3. The disc shear 3 performs symmetrical cutting on both sides of the strip steel 10 based on the set cutting edge width.

[0033] The disc shear 3 includes two shearing blades distributed on both sides of the strip 10. The perpendicular line connecting the two shearing blades is the shearing center line 11 of the disc shear 3. In the traditional symmetrical edge cutting method, the correction device corrects the strip 10 according to the shearing center line 11 of the disc shear 3, so that the center line of the strip 10 coincides with the shearing center line 11 of the disc shear 3, thereby ensuring that the amount of material removed from both sides of the strip 10 is equal when the disc shear 3 cuts the strip 10.

[0034] Understandably, this symmetrical trimming method is only suitable for trimming strips with equal defect widths on both sides, but not for trimming strips with unequal defect widths on both sides.

[0035] Therefore, to address this deficiency, a technical solution is needed to achieve asymmetrical edge cutting of the strip steel by a disc shear. In this application, to achieve asymmetrical edge cutting of the strip steel by a disc shear, a shielding plate 6 is installed in the cold rolling recoiling mill. This shielding plate 6 is used to block the beam emitted by the beam emitter 9. Thus, the asymmetrical edge cutting of the strip steel by the disc shear is achieved using the shielding plate 6.

[0036] The following detailed description of some embodiments of this application will be provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] See Figure 3 This document illustrates a flowchart of a control method for a cold rolling rewinding mill according to an embodiment of this application. Specifically, it includes the following steps 310 to 330: Step 310: In response to the strip head reaching a set position, control the shield to move to the other side of the strip to expose a preset width on that side, where the actual defect width on one side of the strip is greater than the actual defect width on the other side of the strip.

[0038] It should be noted that this setting position should be the position where the centering detection device can detect the strip.

[0039] In some implementations, the set position may be located between the centering detection device and the disc shear.

[0040] In some implementations, the distance between the set position and the centering detection device is 200-500mm, that is, when the strip head passes through the grating frame for 200-500mm, it is considered that the strip head has reached the set position.

[0041] Preferably, the distance between the set position and the centering detection device is 200mm.

[0042] In some implementations, after the strip head reaches a set position, while controlling the strip to continue moving toward the disc shear, the blocking plate can be controlled to move to the other side of the strip.

[0043] In other embodiments, after the strip head reaches a set position, the strip can be controlled to stop moving, and while the strip is stopped, the shield can be controlled to move to one side of the strip.

[0044] Furthermore, after controlling the shield to move to the other side of the strip to expose a preset width on that side, the strip is controlled to continue moving.

[0045] In step 310, it can be understood that the shielding plate moves toward the side of the strip with the smaller actual defect width. In other words, the shielding plate moves toward the side of the strip that requires less material removal.

[0046] In step 310, the shielding plate is exposed on one side of the strip with a preset width. This can be understood as the projection of the shielding plate onto the ground plane and the projection of the strip onto the ground plane having a non-overlapping area, and the width of this non-overlapping area is the preset width. Furthermore, the preset width and the width of the strip are distributed in the same direction.

[0047] In step 310, the specific implementation of controlling the blocking plate to move towards one side of the strip to expose a predetermined width on that side can be performed according to the following steps 311 to 312: Step 311: Control the transmission mechanism to pull the shielding plate from the initial position to the other side of the strip steel. The initial position is set on the grating frame and is outside the detection range corresponding to the beam.

[0048] Step 312: When it is detected that the width of the shielding plate exposed on this side is a preset width, control the transmission mechanism to stop traction.

[0049] It should be noted that the transmission mechanism can be connected to the baffle plate, and thus, by controlling the transmission mechanism, the baffle plate can be moved. For example... Figure 1 The transmission mechanism 7 shown in the figure.

[0050] In this embodiment, when the disc shears are not required to perform the cutting task, or when the disc shears do not need to be assisted by a shield to achieve asymmetrical cutting, the shield needs to be located at the initial position. It is understood that since the initial position is outside the detection range corresponding to the beam of the beam emitter, when the shield is located at this initial position, the shield will not interfere with the beam emitted by the beam emitter, and therefore will not interfere with the detection data of the alignment detection device.

[0051] In this embodiment, the initial position can be set on the upper side of the grating frame, that is, the position of the grating frame above the strip when the strip passes through the grating frame. Therefore, if the initial position is located on the upper side of the grating frame, the blocking plate will move above the strip.

[0052] In this embodiment, the initial position can also be set on the lower side of the grating frame, that is, the position of the grating frame below the strip when the strip passes through the grating frame. Therefore, if the initial position is located on the lower side of the grating frame, the blocking plate will move below the strip.

[0053] In this application, the purpose of providing the shielding plate is to increase the width detected by the centering detection device. Therefore, in order to ensure that the centering detection device can effectively and accurately detect the preset width exposed by the shielding plate, the size and material of the shielding plate can be limited as follows: The shielding plate is rectangular in shape, its length is greater than the detection length corresponding to the beam, its width is greater than half the maximum cutting edge width of the disc shear, and it is made of opaque material.

[0054] It should be noted that the length of the shielding plate and the length of the strip are distributed in the same direction.

[0055] Understandably, setting the length of the blocking plate to be greater than the detection length corresponding to the beam emitted by the beam emitter can enable the blocking plate to fully block the beam, thereby improving the accuracy of the centering detection device in detecting the preset width.

[0056] In this embodiment, preferably, the length of the shielding piece can be set to 80mm.

[0057] It can also be understood that half of the maximum cutting edge width of the disc shears is the maximum single-sided cutting edge width of the disc shears.

[0058] It should be noted that the width of the shielding plate and the width of the strip are distributed in the same direction.

[0059] In this embodiment, preferably, the width of the shielding plate can be set to 100mm.

[0060] In this application, when the disc shear performs the task of cutting the strip steel, it is necessary to set the cutting width of the disc shear, which is twice the cutting width of one side of the disc shear.

[0061] Specifically, the cutting edge width of a disc shear can be understood using the following example: Suppose a coil of steel strip is 100cm wide, but the order requires a width of 80cm. To meet the order requirement, a 20cm section needs to be cut off from the coil. When using a disc shear for this side cut, the cutting edge width can be set to 20cm, meaning the single-side cutting edge width of the disc shear is 10cm. This setting ensures that the width of the cut steel coil meets the order requirement of 80cm.

[0062] In this application, when trimming strips with unequal defect widths on both sides, the trimming width of the disc shear can be determined according to the following... Figure 4 Perform the steps shown: See Figure 4 The diagram illustrates a detailed process for determining the cutting edge width of a disc shear according to an embodiment of this application, specifically including the following steps 410 to 420: Step 410: Adjust the actual defect width on one side of the strip to obtain a first reference defect width, and adjust the actual defect width on the other side of the strip to obtain a second reference defect width, wherein the second defect width is smaller than the first defect width.

[0063] In this embodiment, it should be noted that the first reference defect width is the cut-off width of one side of the strip when it is sheared by the disc. The second reference defect width is the cut-off width of the other side of the strip when it is sheared by the disc.

[0064] In this embodiment, after determining the actual defect width on one side of the strip, the actual defect width on that side can be adjusted based on factors such as the precision of the disc shear and the order width to obtain a first reference defect width. This first reference defect width may be slightly larger or smaller than the actual defect width on one side of the strip, so that the strip after cutting meets the requirements. Of course, the first reference defect width can also be equal to the actual defect width on that side.

[0065] In this embodiment, after determining the actual defect width on the other side of the strip, the actual defect width on the other side can be adjusted based on factors such as the precision of the disc shear and the order width to obtain a second reference defect width. If the actual defect width on the other side of the strip is not zero, the second reference defect width may be slightly larger or smaller than the actual defect width on the other side of the strip, so that the strip after cutting meets the requirements. Of course, the second reference defect width can also be equal to the actual defect width on the other side.

[0066] In this embodiment, the actual defect width on the other side of the strip may be 0, meaning the quality of the other side of the strip is good and there are no defects. In this case, a specific implementation method for adjusting the actual defect width on the other side of the strip to obtain the second reference defect width can be: if the actual defect width on the other side of the strip is 0, then a set defect width is used as the second reference defect width, wherein the set defect width is greater than 0.

[0067] It should be noted that if the width of the second reference defect is set to 0, that is, if the disc shear does not perform side cutting on the other side of the strip, but only on one side, then during the cutting process of the disc shear, there will be a large error in the correction control of the strip, which will make the strip prone to deviation, thus causing a large error in the cutting of one side of the strip and reducing the cutting quality of the disc shear.

[0068] Therefore, in this embodiment, if the actual defect width on the other side of the strip is 0, a predefined defect width that is not 0 can be determined as the second reference defect. This predefined defect width can be set to a small value such as 1cm or 2cm.

[0069] See also Figure 2 Step 420: The sum of the width of the first reference defect and the width of the second reference defect is used as the cutting edge width of the disc shear.

[0070] Understandably, the difference between the width of the strip before side cutting begins and the determined cutting edge width of the disc shear is the final width of the strip after disc shearing. This final width can meet the order width requirements.

[0071] In summary, through steps 410 to 420, the corresponding cutting edge width can be determined for strip steel with asymmetrical defects on both sides. Furthermore, based on the determined cutting edge width, the operating parameters of the disc shear can be set so that the disc shear is set to the determined cutting edge width.

[0072] In this application, in order to achieve precise asymmetrical cutting of both sides of the strip by the disc shear, the preset width of the shielding plate exposed on the other side of the strip can be determined by performing the following steps: calculating the difference between the width of the first reference defect and the width of the second defect to obtain the preset width.

[0073] It is understood that, in this embodiment, the difference between the determined first reference defect width and the second reference defect width is determined as the preset width of the shielding sheet exposed on one side of the strip.

[0074] See also Figure 3Step 320: Obtain the center line determined by the centering detection device based on the width of the strip and the preset width.

[0075] Understandably, after the shielding plate is exposed at a preset width on one side of the strip, the centering detection device will detect the strip and obtain the width, which will be the sum of the preset width of the exposed shielding plate and the actual width of the strip. In other words, the width data obtained by the centering detection device is the sum of the preset width and the width of the strip.

[0076] Furthermore, the center line can be determined based on the width data obtained from the centering detection device.

[0077] Understandably, the distance from the center line of the alignment to the other side of the strip is half the width data.

[0078] For example, in Figure 2 In the process, there exists a shearing center line 11 of the disc shear 3, and also a determined center line 12. It can be seen that the center line 12 is closer to the other side of the strip relative to one side of the strip.

[0079] See also Figure 3 Step 330: Control the correction device to correct the strip steel according to the center line, so that the disc shear performs asymmetrical cutting on both sides of the strip steel.

[0080] After determining the center line, the correction device will regard the center line as the shearing center line of the disc shear, and thus correct the strip steel passing through, so that the center line of the corrected strip steel coincides with the center line.

[0081] like Figure 2 As shown, the strip 10 shown is the strip that has not yet been corrected. If the correction device corrects the strip 10 according to the center line 12, then when the corrected strip 10 reaches the disc shear 3, the center line of the strip 10 coincides with the center line 12. This reduces the side cutting amount of the strip on the side where the shield is located, and correspondingly increases the side cutting amount on the other side of the strip. This achieves asymmetrical cutting of the two sides of the strip by the disc shear.

[0082] In some embodiments of this application, in the field of cold-rolled recoil production, during the process of removing defects on the side of strip steel using a disc shear, a pre-defined width of shielding plate is exposed on the side of the strip steel with the smaller actual defect width. This allows the centering detection device to identify the centering centerline based on the pre-defined width of the shielding plate and the width of the strip steel. Consequently, the correction device will not correct the strip steel according to the shearing centerline of the disc shear, but will correct the strip steel according to the centering centerline obtained by the centering detection device. As a result, when the strip steel reaches the disc shear, the centerline of the strip steel does not coincide with the shearing line of the disc shear. This prevents the disc shear from symmetrically cutting the two sides of the strip steel, enabling asymmetrical cutting on both sides of the strip steel. That is, the amount of strip steel removed by the disc shear on both sides of the strip steel is not equal, thereby reducing the amount of qualified strip steel removed and improving the strip steel yield.

[0083] Based on the same inventive concept, embodiments of the present invention provide a control device for a cold rolling recoiling mill, which can be used to execute the control method for the cold rolling recoiling mill in the above embodiments of this application. For details not disclosed in the embodiments of this application, please refer to the embodiments of the control method for the cold rolling recoiling mill described above.

[0084] See Figure 5 This diagram illustrates a block diagram of a control device for a cold rolling rewinding mill according to an embodiment of this application.

[0085] like Figure 5 As shown, a control device 500 for a cold rolling recoiling mill according to an embodiment of this application is provided. The cold rolling recoiling mill includes a disc shear, a correction device, a shielding plate, and an alignment detection device equipped with a beam emitter. The shielding plate is used to block the beam emitted by the beam emitter. The device 500 includes: a first control unit 501, an acquisition unit 502, and a second control unit 503.

[0086] The first control unit 501 is used to control the shielding plate to move to the other side of the strip in response to the strip head reaching a set position, so as to expose a preset width on that side, wherein the actual defect width on one side of the strip is greater than the actual defect width on the other side of the strip; the acquisition unit 502 is used to acquire the center line determined by the center detection device based on the width of the strip and the preset width; the second control unit 503 is used to control the correction device to correct the strip according to the center line, so that the disc shear performs asymmetrical cutting on both sides of the strip.

[0087] In some embodiments of this application, based on the foregoing scheme, the set position is located between the centering detection device and the disc shear.

[0088] In some embodiments of this application, based on the aforementioned scheme, the distance between the set position and the centering detection device is 200-500mm.

[0089] In some embodiments of this application, based on the foregoing scheme, the cold rolling recoiling mill further includes a conveying mechanism, the centering detection device includes a grating frame, and the first control unit 501 is further configured to: control the conveying mechanism to pull the shielding plate from an initial position to the other side of the strip, the initial position being set on the grating frame and outside the detection range corresponding to the light beam; when it is detected that the width of the shielding plate exposed on that side is a preset width, control the conveying mechanism to stop pulling.

[0090] In some embodiments of this application, based on the foregoing scheme, the length of the shielding plate is greater than the detection length corresponding to the light beam, the width of the shielding plate is greater than half of the maximum cutting edge width of the disc shear, and the shielding plate is made of an opaque material.

[0091] In some embodiments of this application, based on the foregoing scheme, the device further includes a determining unit, which is used to: adjust the actual defect width on one side of the strip to obtain a first reference defect width, and adjust the actual defect width on the other side of the strip to obtain a second reference defect width, wherein the second defect width is smaller than the first defect width; and use the sum of the first reference defect width and the second reference defect width as the cutting edge width of the disc shear.

[0092] In some embodiments of this application, based on the foregoing scheme, the determining unit is further configured to: if the actual defect width on the other side of the strip is 0, then set the defect width as the second reference defect width, wherein the set defect width is greater than 0.

[0093] In some embodiments of this application, based on the foregoing scheme, the determining unit is further configured to: calculate the difference between the first reference defect width and the second defect width to obtain the preset width.

[0094] In some embodiments of this application, based on the foregoing scheme, before controlling the shield to move to the other side of the strip, the first control unit 501 is further configured to: control the strip to stop moving; After controlling the shield to move toward one side of the strip to expose a preset width on that side, the first control unit 501 is further configured to: control the strip to continue moving.

[0095] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A control method for a cold rolling recoiling mill, characterized in that, The cold rolling recoiling mill includes a disc shear, a correction device, a shielding plate, and a centering detection device equipped with a beam emitter. The shielding plate is used to block the beam emitted by the beam emitter. The method includes: In response to the strip head reaching a set position, the blocking plate is controlled to move to the other side of the strip to expose a preset width on that side, where the actual defect width on one side of the strip is greater than the actual defect width on the other side of the strip. Obtain the centerline determined by the centering detection device based on the width of the strip and the preset width; The correction device is controlled to correct the strip steel according to the center line, so that the disc shear performs asymmetrical cutting on both sides of the strip steel.

2. The method according to claim 1, characterized in that, The designated position is located between the centering detection device and the disc shear.

3. The method according to claim 2, characterized in that, The distance between the set position and the centering detection device is 200-500mm.

4. The method according to claim 2, characterized in that, The cold-rolled recoiling mill also includes a transmission mechanism, the centering detection device includes a grating frame, and the control of the blocking plate to move to the other side of the strip to expose a preset width on that side includes: The transmission mechanism is controlled to pull the shielding plate from the initial position to the other side of the strip steel. The initial position is set on the grating frame and is outside the detection range corresponding to the beam. When the width of the shielding plate exposed on this side is detected to be a preset width, the transmission mechanism is controlled to stop traction.

5. The method according to claim 1, characterized in that, The length of the shielding plate is greater than the detection length corresponding to the beam, the width of the shielding plate is greater than half of the maximum cutting edge width of the disc shear, and the shielding plate is made of opaque material.

6. The method according to claim 1, characterized in that, The method further includes: The actual defect width on one side of the strip is adjusted to obtain a first reference defect width, and the actual defect width on the other side of the strip is adjusted to obtain a second reference defect width, wherein the second reference defect width is smaller than the first reference defect width. The sum of the width of the first reference defect and the width of the second reference defect is used as the cutting edge width of the disc shears.

7. The method according to claim 6, characterized in that, The step of adjusting the actual defect width on the other side of the strip to obtain the second reference defect width includes: If the actual defect width on the other side of the strip is 0, then the set defect width is used as the second reference defect width, and the set defect width is greater than 0.

8. The method according to claim 6, characterized in that, The method further includes: The difference between the width of the first reference defect and the width of the second reference defect is calculated to obtain the preset width.

9. The method according to claim 1, characterized in that, Before controlling the movement of the shielding plate to the other side of the strip, the method further includes: Control the strip to stop moving; After controlling the blocking plate to move to the other side of the strip to expose a predetermined width on that side, the method further includes: Control the strip to continue moving.

10. A control device for a cold rolling recoiling mill, characterized in that, The cold rolling recoiling mill includes a disc shear, a correction device, a shielding plate, and a centering detection device equipped with a beam emitter. The shielding plate is used to block the beam emitted by the beam emitter. The device includes: A first control unit is configured to control the shield to move to the other side of the strip in response to the strip head reaching a set position, so as to expose a preset width on that side, wherein the actual defect width on one side of the strip is greater than the actual defect width on the other side of the strip. The acquisition unit is used to acquire the center line determined by the centering detection device based on the width of the strip and the preset width; The second control unit is used to control the correction device to correct the strip steel according to the center line, so that the disc shear performs asymmetrical cutting on both sides of the strip steel.

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