A method of shearing a steel plate

Abstract

The application discloses a steel plate shearing method and relates to the technical field of steel rolling. The head profile of a steel plate is obtained, the length of the irregular part of the head is measured according to the head profile, and the irregular part of the head is cut off; the tail profile of the steel plate is obtained, and the length of the irregular part of the tail is measured according to the tail profile; the overall length of the steel plate after the irregular part of the head is cut off is measured; the maximum rectangular length is obtained by subtracting the length of the irregular part of the tail from the overall length; and the irregular part of the tail is cut off according to the maximum rectangular length. Compared with the prior art, the steel plate shearing method provided by the application can guarantee that the sheared steel plate is a rectangular plate with the maximum size, has high shearing precision, guarantees production efficiency, avoids material waste, reduces the cutting loss, and improves the yield of the finished product, since the steps of obtaining the head profile of the steel plate, measuring the length of the irregular part of the head according to the head profile, and cutting off the irregular part of the head are adopted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel rolling, in particular to a steel plate shearing method. BACKGROUND

[0002] At present, since irregular parts are generated at the head and tail of the steel plate during the rolling process, the steel plate needs to be sheared in the length direction after the steel rolling is completed to remove the irregular parts, so that the steel plate forms a regular rectangular plate. The current shearing method of the steel plate is generally to manually estimate the maximum rectangular length of the steel plate, and then to shear the steel plate in the length direction according to the estimated length by using a fixed-length shearing machine. However, since there is a large deviation in the visual estimation of the length, the shearing length is prone to be insufficient or excessive. If the shearing length is insufficient, the obtained steel plate is not a regular rectangular plate, which needs to be sheared again, thereby wasting time and effort and reducing the production efficiency. If the shearing length is excessive, the obtained steel plate is not a rectangular plate with the maximum size, which leads to material waste, increases the cutting loss and reduces the yield.

[0003] Therefore, it is particularly important to design a steel plate shearing method with high shearing precision in the steel rolling production. SUMMARY

[0004] The present application aims to provide a steel plate shearing method, which can ensure that the sheared steel plate is a rectangular plate with the maximum size, has high shearing precision, ensures the production efficiency, avoids material waste, reduces the cutting loss and improves the yield.

[0005] The present application is implemented by using the following technical solutions.

[0006] The present application is implemented by using the following technical solutions.

[0007] Optionally, the step of obtaining the head profile of the steel plate, measuring the length of the head irregular part according to the head profile and cutting off the head irregular part comprises the following steps: scanning the head of the steel plate by using a profile gauge to obtain an edge digital signal; processing and correcting the edge digital signal by using a controller to obtain the head profile; measuring the length of the head irregular part according to the head profile by using the controller; and cutting off the head irregular part of the steel plate by using a shearing machine.

[0008] Optionally, the step of processing and correcting the edge digital signal by the controller to obtain the head profile comprises: iteratively calculating edge values in the length direction of the steel plate according to the edge digital signal, and connecting edge points corresponding to part of the edge values into an edge curve so that the projection of the edge curve in the length direction of the steel plate is the shortest; correcting a plurality of edge points on the edge curve by a normal distribution to eliminate interference points that do not meet the conditions; correcting the weight of the remaining edge points by a weight coefficient to obtain actual edge points, and connecting a plurality of actual edge points into the head profile.

[0009] Optionally, the step of iteratively calculating edge values in the length direction of the steel plate according to the edge digital signal, and connecting edge points corresponding to part of the edge values into an edge curve so that the projection of the edge curve in the length direction of the steel plate is the shortest comprises: iteratively calculating the edge values by a first formula, wherein the first formula is: In the formula, k represents the kth value in the N edge values; L k represents the kth value in the length direction of the steel plate; X k represents the actual value, X l represents the predicted value.

[0010] Optionally, the step of correcting a plurality of edge points on the edge curve by a normal distribution to eliminate interference points that do not meet the conditions comprises: correcting the plurality of edge points by a second formula, wherein the second formula is: In the formula, x represents the pixel coordinate; y represents the gray value; and δ is a normal distribution parameter.

[0011] Optionally, the step of correcting the weight of the remaining edge points by a weight coefficient to obtain actual edge points, and connecting a plurality of actual edge points into the head profile comprises: correcting the weight of the edge points by a third formula, wherein the third formula is: f(x,y)=W -1 ∑∑g(x,y) w ; in the formula, W is the weight coefficient.

[0012] Optionally, a laser curtain is arranged in front of the shearing machine, the distance between the laser curtain and the entrance of the shearing machine is a first distance, the distance between the entrance of the shearing machine and the exit of the shearing machine is a second distance, and the step of measuring the overall length of the steel plate after cutting off the irregular part of the head comprises: sequentially passing the steel plate through the laser curtain and the shearing machine, measuring the overhanging length of the steel plate overhanging out of the exit of the shearing machine when the tail of the steel plate leaves the laser curtain; and adding the first distance, the second distance and the overhanging length to obtain the overall length.

[0013] Optionally, the step of obtaining the tail profile of the steel plate and measuring the length of the tail irregular part according to the tail profile comprises: scanning the tail of the steel plate by using a profiler to obtain an edge digital signal; processing and correcting the edge digital signal by using a controller to obtain the tail profile; and measuring the length of the tail irregular part according to the tail profile by using the controller.

[0014] Optionally, before the step of cutting off the tail irregular part according to the maximum rectangular length, the steel plate shearing method further comprises: checking the maximum rectangular length.

[0015] Optionally, a scale is arranged on one side of the steel plate, and a laser trolley is arranged on the other side, the length direction of the scale is the same as the length direction of the steel plate, the laser trolley is used to emit laser light to vertically irradiate on the scale, and the step of checking the maximum rectangular length comprises: controlling the laser trolley to move from one end of the tail irregular part close to the steel plate along the length direction of the steel plate by the maximum rectangular length, and manually observing whether the laser light emitted by the laser trolley is flush with the head of the steel plate.

[0016] The steel plate shearing method provided by the application has the following beneficial effects:

[0017] The steel plate shearing method provided by the application obtains the head profile of the steel plate, measures the length of the head irregular part according to the head profile, and cuts off the head irregular part; obtains the tail profile of the steel plate, and measures the length of the tail irregular part according to the tail profile; measures the overall length of the steel plate after cutting off the head irregular part; subtracts the length of the tail irregular part from the overall length to obtain the maximum rectangular length; and cuts off the tail irregular part according to the maximum rectangular length. Compared with the prior art, the steel plate shearing method provided by the application can guarantee that the sheared steel plate is a rectangular plate with the maximum size, has high shearing precision, guarantees production efficiency, avoids material waste, reduces the cutting loss, and improves the yield. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0019] Figure 1 The structure schematic diagram of the steel plate shearing device applied to the steel plate shearing method provided by the embodiments of the application;

[0020] Figure 2A step block diagram of the steel plate shearing method provided by the embodiment of the present application is shown.

[0021] Icon: 100-steel plate shearing device; 110-conveying roller; 120-profile gauge; 130-light curtain generator; 131-laser light curtain; 140-shearing machine; 141-cutting knife; 150-checking assembly; 151-bearing roller; 152-ruler; 153-laser trolley; 154-guide rail; 200-steel plate. DETAILED DESCRIPTION

[0022] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0024] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0025] In the description of the present application, it should be noted that the terms "inner", "outer", "upper", "lower", "horizontal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present application, it is also necessary to explain that, unless otherwise explicitly specified and limited, the terms "set", "connected", "mounted", "connected" should be understood broadly, for example, can be fixedly connected, can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The features in the following examples can be combined with each other without conflict.

[0028] Please refer to Figure 1 and Figure 2 The steel plate shearing method provided by the embodiments of the present application is used for shearing the steel plate 200. It can ensure that the sheared steel plate 200 is a rectangular plate with the largest size, has high shearing precision, ensures production efficiency, avoids material waste, reduces cutting loss, and improves the yield.

[0029] It should be noted that the steel plate shearing method is applied to a steel plate shearing device 100, and the steel plate shearing device 100 includes a conveying roller 110, a profile gauge 120, a controller (not shown in the figure), a light curtain generator 130, a shearing machine 140, and a checking assembly 150. The controller is electrically connected with the conveying roller 110, the profile gauge 120, the light curtain generator 130, the shearing machine 140, and the checking assembly 150 at the same time to realize the electric control function; the conveying roller 110 is used to drive the steel plate 200 after rolling to forward feed along the length direction thereof; the profile gauge 120, the light curtain generator 130, the shearing machine 140, and the checking assembly 150 are sequentially arranged along the feeding direction of the steel plate 200; the profile gauge 120 is used to obtain the profile of the steel plate 200; the light curtain generator 130 is used to emit a laser light curtain 131; the shearing machine 140 is used to cut the steel plate 200; and the checking assembly 150 is used to check the maximum rectangular length of the steel plate 200.

[0030] Specifically, the checking assembly 150 comprises a bearing roller table 151, a scale 152, a laser trolley 153 and a guide rail 154. The bearing roller table 151 is used to bear the steel plate 200 and drive the steel plate 200 to feed forward along the length direction of the steel plate 200. The scale 152 and the guide rail 154 are oppositely arranged on the two sides of the bearing roller table 151. The laser trolley 153 is slidably arranged on the guide rail 154, that is, the scale 152 and the laser trolley 153 are oppositely arranged on the two sides of the bearing roller table 151, and the scale 152 and the laser trolley 153 are oppositely arranged on the two sides of the steel plate 200. The length direction of the scale 152 is the same as the length direction of the steel plate 200, and the length direction of the guide rail 154 is the same as the length direction of the steel plate 200. The laser trolley 153 can move relative to the guide rail 154 along the length direction of the steel plate 200, and the laser trolley 153 can also emit laser light to vertically irradiate on the scale 152 to realize the checking function.

[0031] The steel plate shearing method comprises the following steps:

[0032] Step S110: obtaining the head profile of the steel plate 200, measuring the length of the head irregular part according to the head profile, and cutting off the head irregular part.

[0033] Specifically, step S110 comprises three steps, which are:

[0034] Step S111: scanning the head of the steel plate 200 by using the profilometer 120 to obtain an edge digital signal.

[0035] It should be noted that in step S111, the steel plate 200 is driven to feed forward by the conveying roller table 110 so that the head of the steel plate 200 passes through the profilometer 120. The profilometer 120 applies the principle of stereo vision measurement and adopts two linear array CCD cameras as sensors to simultaneously scan the edge position of the head of the steel plate 200 to obtain an edge digital signal, and sends the edge digital signal to the controller.

[0036] Specifically, the two linear array CCD cameras are arranged at intervals along the width direction of the steel plate 200, and both are arranged obliquely, and the oblique angle is adjusted so that the field of view of each linear array CCD camera can cover at least half of the area of the steel plate 200. When measuring, the two side edges of the steel plate 200 have clear images on the corresponding two linear array CCD cameras. According to the geometric relationship of stereo vision, the spatial coordinates of each point of the two side edges of the steel plate 200 can be calculated, and the spatial coordinates of multiple points are combined to obtain the edge digital signal.

[0037] Step S112: processing and correcting the edge digital signal by using the controller to obtain the head profile.

[0038] It should be noted that in step S112, due to vibrations during the actual production process as the steel plate 200 is fed forward, it repeatedly switches between deformed and reset states. Therefore, the edge digital signals obtained by the profilometer 120 are inaccurate. The spatial coordinates of some points are measured when the steel plate 200 is in a deformed state, while the spatial coordinates of others are measured when it is in a reset state. This significantly interferes with the generation of the actual head contour of the steel plate 200, affecting the shearing accuracy. Therefore, the controller needs to process and correct the edge digital signals to eliminate the spatial coordinates of points measured when the steel plate 200 is in a deformed state, thereby reducing measurement errors and ensuring that the sheared steel plate 200 is the largest possible rectangular plate.

[0039] Furthermore, step S112 includes three steps, namely:

[0040] Step S1121: Iteratively calculate the edge value along the length of the steel plate 200 based on the edge digital signal, and connect the edge points corresponding to some edge values ​​to form an edge curve, so that the projection of the edge curve along the length of the steel plate 200 is the shortest.

[0041] It should be noted that in step S1121, the edge value is first calculated iteratively using the first formula and repeatedly corrected by recursion until it reaches the preset accuracy; then, the multiple edge points corresponding to the multiple edge values ​​are marked; then, a portion of the multiple edge points are selected and connected to form an edge curve so that the projection of the edge curve on the length direction of the steel plate 200 is the shortest, thereby minimizing the amount of cutting loss, increasing the yield, and avoiding material waste.

[0042] Specifically, the first formula is:

[0043] In the formula, k represents the k-th value among N edge values; L k This represents the k-th value along the length of the steel plate 200; X k X represents the actual value. l This represents the predicted value.

[0044] Step S1122: Correct multiple edge points on the edge curve using a normal distribution and remove interference points that do not meet the conditions.

[0045] It should be noted that in step S1122, the second formula is used to correct multiple edge points. Based on actual production experience, the edge curve conforms to the normal distribution law. By correcting multiple edge points on the edge curve through the normal distribution, edge points that do not meet the conditions are regarded as interference points and are eliminated to reduce the measurement error caused by the vibration of the steel plate 200 and ensure the shearing accuracy.

[0046] Specifically, the second formula is:

[0047] In the formula, x represents a pixel coordinate; y represents a gray value; and δ is a normal distribution parameter.

[0048] Step S1123: Correct the weight of the remaining edge points by the weight coefficient to obtain actual edge points, and connect the plurality of actual edge points into a head profile.

[0049] It should be noted that in step S1123, first, the weight of the edge points is corrected by the third formula, and the plurality of actual edge points are obtained by weighting or de-weighting each edge point, so as to further reduce the measurement error caused by the vibration of the steel plate 200 and ensure the shearing accuracy; then the plurality of actual edge points are connected into a head profile, and the head profile is the real profile of the head of the steel plate 200.

[0050] Specifically, the third formula is: f(x, y) = W -1 ∑∑g(x,y) w ;

[0051] In the formula, W is a weight coefficient.

[0052] Step S113: Measure the length of the irregular part of the head by the controller according to the head profile.

[0053] It should be noted that in step S113, since the head of the steel plate 200 has an irregular part, the length of the irregular part of the head in the length direction of the steel plate 200 can be measured by the head profile, so as to facilitate subsequent shearing and ensure that the steel plate 200 obtained by shearing is a rectangular plate with the largest size.

[0054] Step S114: Cut off the irregular part of the head of the steel plate 200 by the shearing machine 140.

[0055] It should be noted that in step S114, the steel plate 200 is continuously forwarded by the conveying roller 110 so that the head passes through the laser curtain 131 and enters the shearing machine 140. The shearing machine 140 shears the steel plate 200 according to the length of the head irregular part to cut off the head irregular part of the steel plate 200. Specifically, the shearing machine 140 is provided with a cutter 141, and the steel plate 200 gradually passes through the position corresponding to the cutter 141 during the forwarding process. When the length of the steel plate 200 passing through the cutter 141 is equal to the length of the head irregular part, the conveying roller 110 is controlled to pause, the shearing machine 140 is started, and the cutter 141 is used to cut off the head irregular part. The plane where the cutter 141 is located is perpendicular to the length direction of the steel plate 200, so that the head of the steel plate 200 after cutting is flush and regular, and serves as the first end of the rectangular plate.

[0056] Step S120: Obtain the tail contour of the steel plate 200, and measure the length of the tail irregular part according to the tail contour.

[0057] It should be noted that in step S120, the steel plate 200 is continuously forwarded by the conveying roller 110 and the bearing roller 151 synchronously to pass the tail of the steel plate 200 through the profiler 120. In this process, the head of the steel plate 200 extends out of the shearing machine 140 and moves to the bearing roller 151. First, the tail of the steel plate 200 is scanned by the profiler 120 to obtain an edge digital signal. Then, the edge digital signal is processed and corrected by the controller to obtain the tail contour. Finally, the length of the tail irregular part is measured by the controller according to the tail contour.

[0058] In this embodiment, the step of measuring the length of the tail irregular part is the same as the step of measuring the length of the head irregular part, which will not be repeated here.

[0059] Step S130: Measure the overall length of the steel plate 200 after cutting off the head irregular part.

[0060] In this embodiment, the front of the shearing machine 140 is provided with a laser curtain 131, and the shearing machine 140 is oppositely provided with an inlet and an outlet. The distance between the laser curtain 131 and the inlet of the shearing machine 140 is a first distance, and the distance between the inlet of the shearing machine 140 and the outlet of the shearing machine 140 is a second distance.

[0061] It should be noted that in step S130, the steel plate 200 is continuously forwarded by the bearing roller 151 so that the tail of the steel plate 200 passes through the laser curtain 131. When the tail of the steel plate 200 leaves the laser curtain 131, the bearing roller 151 is controlled to pause, the extension length of the steel plate 200 extending out of the outlet of the shearing machine 140 is measured, and the first distance, the second distance and the extension length are added to obtain the overall length.

[0062] Step S140: subtract the length of the tail irregular part from the overall length to obtain the maximum rectangular length.

[0063] It should be noted that in step S140, the overall length is the length of the steel plate 200 after cutting off the head irregular part, and the maximum rectangular length can be obtained by subtracting the length of the tail irregular part from the overall length, so as to obtain the rectangular plate with the largest size, which has high cutting precision, ensures production efficiency, avoids material waste, reduces cutting loss, and improves the yield.

[0064] Step S150: check the maximum rectangular length.

[0065] It should be noted that in step S150, the laser trolley 153 is controlled to move from the end of the tail irregular part to the steel plate 200 along the length direction of the steel plate 200 by the maximum rectangular length, and the laser emitted by the laser trolley 153 is manually observed to be flush with the head of the steel plate 200. At this time, the head of the steel plate 200 is a plane perpendicular to the length direction of the steel plate 200, and if the laser emitted by the laser trolley 153 is flush with the head of the steel plate 200, it means that the maximum rectangular length is correct; if the laser emitted by the laser trolley 153 has a certain gap with the head of the steel plate 200 in the length direction of the steel plate 200, it means that the maximum rectangular length is incorrect and needs to be manually confirmed.

[0066] Step S160: cut off the tail irregular part according to the maximum rectangular length.

[0067] It should be noted that in step S160, the steel plate 200 is further fed forward by the carrying roller 151 to make the tail of the steel plate 200 enter the shearing machine 140. The shearing machine 140 shears the steel plate 200 according to the maximum rectangular length to cut off the tail irregular part of the steel plate 200. Specifically, after the head irregular part is cut off, the remaining steel plate 200 continues to feed forward under the joint driving of the conveying roller 110 and the carrying roller 151, and when the length of the remaining steel plate 200 passing through the cutting knife 141 is equal to the maximum rectangular length, the carrying roller 151 is controlled to pause, the shearing machine 140 is started, and the tail irregular part is cut off by the cutting knife 141. The plane where the cutting knife 141 is located is perpendicular to the length direction of the steel plate 200, so that the tail of the steel plate 200 after cutting is flush and regular, and serves as the end of the rectangular plate.

[0068] The steel plate shearing method provided by the embodiment of the present application obtains the head profile of the steel plate 200, measures the length of the irregular part of the head according to the head profile, and cuts off the irregular part of the head; measures the overall length of the steel plate 200 after cutting off the irregular part of the head; obtains the tail profile of the steel plate 200, and measures the length of the irregular part of the tail according to the tail profile; subtracts the length of the irregular part of the tail from the overall length to obtain the maximum rectangular length; and cuts off the irregular part of the tail according to the maximum rectangular length. Compared with the prior art, the steel plate shearing method provided by the present application can guarantee that the steel plate 200 obtained by shearing is a rectangular plate with the largest size, has high shearing precision, guarantees production efficiency, avoids material waste, reduces the cutting loss, and improves the yield.

[0069] The above merely describes the preferred embodiments of the present application, but is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for shearing steel plates, characterized in that, include: Obtain the head contour of the steel plate (200), measure the length of the irregular part of the head based on the head contour, and cut off the irregular part of the head, including: The head of the steel plate (200) is scanned using a profilometer (120) to obtain edge digital signals; The head contour is obtained by processing and correcting the edge digital signal using a controller, including: iteratively calculating edge values ​​based on the edge digital signal along the length of the steel plate (200), and connecting edge points corresponding to some of the edge values ​​to form an edge curve, so that the projection of the edge curve along the length of the steel plate (200) is minimized; correcting multiple edge points on the edge curve using a normal distribution, and removing interference points that do not meet the conditions; correcting the weights of the remaining edge points using weighting coefficients to obtain actual edge points, and connecting multiple actual edge points to form the head contour; The controller is used to measure the length of the irregular portion of the head based on the head contour. The irregular portion at the head of the steel plate (200) is removed using a shearing machine (140); Obtain the tail profile of the steel plate (200), and measure the length of the irregular part of the tail based on the tail profile; Measure the overall length of the steel plate (200) after the irregular portion of the head has been removed; Subtracting the length of the irregular tail portion from the overall length yields the maximum rectangle length. The irregular portion at the tail is cut off according to the maximum rectangular length.

2. The steel plate shearing method according to claim 1, characterized in that, The step of iteratively calculating the edge value based on the edge digital signal along the length of the steel plate (200) and connecting the edge points corresponding to some of the edge values ​​to form an edge curve, so that the projection of the edge curve along the length of the steel plate (200) is minimized, includes: The edge value is calculated iteratively using a first formula, wherein the first formula is: , ； In the formula, k represents the k-th value among the N edge values; This represents the k-th value along the length of the steel plate (200); Indicates the actual value. This represents the predicted value.

3. The steel plate shearing method according to claim 2, characterized in that, The step of correcting multiple edge points on the edge curve using a normal distribution and removing interference points that do not meet the conditions includes: The second formula is used to correct multiple edge points, wherein the second formula is: ； In the formula, x represents the pixel coordinate; y represents the grayscale value; is the parameter of the normal distribution.

4. The steel plate shearing method according to claim 3, characterized in that, The step of correcting the weights of the remaining edge points using weighting coefficients to obtain the actual edge points, and connecting multiple actual edge points to form the head contour, includes: The weights of the edge points are corrected using a third formula, wherein the third formula is: ； In the formula, W is the weighting coefficient.

5. The steel plate shearing method according to claim 1, characterized in that, A laser light curtain (131) is set in front of the shearing machine (140). The distance between the laser light curtain (131) and the entrance of the shearing machine (140) is a first distance, and the distance between the entrance of the shearing machine (140) and the exit of the shearing machine (140) is a second distance. The step of measuring the overall length of the steel plate (200) after the irregular part of the head is removed includes: The steel plate (200) is passed through the laser light curtain (131) and the shearing machine (140) in sequence. When the tail of the steel plate (200) leaves the laser light curtain (131), the extension length of the steel plate (200) extending out of the shearing machine (140) is measured. The overall length is obtained by adding the first spacing, the second spacing, and the protrusion length together.

6. The steel plate shearing method according to claim 1, characterized in that, The step of obtaining the tail profile of the steel plate (200) and measuring the length of the irregular tail portion based on the tail profile includes: The tail of the steel plate (200) is scanned using a profilometer (120) to obtain edge digital signals; The tail contour is obtained by processing and correcting the edge digital signal using a controller. The controller is used to measure the length of the irregular portion of the tail based on the tail profile.

7. The steel plate shearing method according to claim 1, characterized in that, Before the step of cutting off the irregular tail portion according to the maximum rectangular length, the steel plate shearing method further includes: The length of the maximum rectangle is checked.

8. The steel plate shearing method according to claim 7, characterized in that, A scale (152) is set on one side of the steel plate (200), and a laser carriage (153) is set on the other side. The length direction of the scale (152) is the same as the length direction of the steel plate (200). The laser carriage (153) is used to emit laser light perpendicularly to the scale (152). The step of verifying the length of the maximum rectangle includes: The laser cart (153) is controlled to move along the length of the steel plate (200) from the end of the irregular part of the tail to the maximum rectangular length, and the laser emitted by the laser cart (153) is manually observed to be flush with the head of the steel plate (200).

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