Method and control system for measuring flying shear head length on line

Abstract

The embodiment of the invention provides a method for measuring the length of a flying shear head on line and a control system, and belongs to the field of automatic detection. The method comprises the steps that a first metal detector is used for obtaining a first coded value when the head of a rolled piece passes; a second metal detector is used for obtaining a second coding value when the head of the rolled piece passes; acquiring a corresponding third coding value when the head of the rolled piece is sheared by the head cutting flying shear; a third metal detector is used for obtaining a fourth coding value when a new head of the rolled piece subjected to head cutting passes through; and according to the first coding value, the second coding value, the third coding value, the fourth coding value, the first coordinate distance between the first metal detector and the second metal detector, and the second coordinate distance, the third coordinate distance and the fourth coordinate distance between the second metal detector and the third metal detector, the actual head cutting length of the rolled piece is determined. According to the embodiment of the invention, the rolled piece cropping length can be accurately measured on line, and the accuracy of early prediction of the total length of the rolled piece can be improved.

Description

Technical Field

[0001] The present invention relates to the field of automatic detection technology, and in particular to a method for online measuring the length of a flying shear head, a control system for online measuring the length of a flying shear head, a computer-readable storage medium and a computer program product. Background Art

[0002] With the increasing demand for intelligence in the steel rolling field, higher requirements are also placed on automation. At present, in the field of rolled product processing, due to the volatility of the length of rolled products (such as bars), there are errors in full-length shearing, and workers are required to pick out non-fixed-length materials in the collection area. In order to achieve high-quality full-length shearing, we innovatively proposed a method for early prediction of the total length of rolled products and optimization of the flying shear shearing strategy. This method requires real-time acquisition of the precise length of rolled products at the exit of each frame, and the precise online measurement of the flying shear head length is the key difficulty in improving the accuracy of early prediction of the total length of rolled products. The existing automated control system realizes the setting, online measurement and shearing of the cutting head length, but the accuracy is insufficient. The main problems are: 1) The measurement of the control system serves shearing, and the measurement needs to be completed before shearing, and there is a lack of post-measurement; 2) The dynamic change of the forward slip and the non-uniformity of the material shape lead to inaccurate forward slip values ​​or pulse equivalents pre-estimated by the control system. When shearing as shearing parameters, there is an error between the measured shearing length and the set length; 3) The control accuracy is insufficient, and there is a shearing error between the calculated shearing length and the actual shearing length; 4) There is an error amplification effect. From the head shear to the finished product, due to the existence of elongation, the error presents an amplification effect, which can usually be amplified by about 10 to 50 times. Therefore, high-precision measurement of the flying shear head length is required. At the same time, the shearing length cannot be actually measured online by a ruler on site, because the sheared steel heads all fall into the waste frame, and the steel is in a high temperature state and cannot be measured. After the steel cools, the measurement is inaccurate due to the cold shrinkage. Based on the above needs and problems, the present invention proposes a method for accurately measuring the length of the flying shear head online, which helps to improve the accuracy of early prediction of the total length of the rolled piece. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide a method for online measuring the length of a shearing head, a control system for online measuring the length of a shearing head, a computer-readable storage medium and a computer program product. The method partially or completely solves the problem that the prior art cannot accurately measure the length of the shearing head of the rolled piece in real time online, thereby resulting in the inability to improve the accuracy of early prediction of the total length of the rolled piece.

[0004] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a method for online measuring the length of a flying shearing shear, the method comprising: arranging a first metal detector, a second metal detector and a third metal detector in sequence between an upstream device and a downstream device; using the first metal detector, obtaining a first code value corresponding to when a head of a rolled piece passes through the first metal detector; using the second metal detector, obtaining a second code value corresponding to when the head of the rolled piece passes through the second metal detector; obtaining a third code value corresponding to when the head of the rolled piece is sheared by the flying shearing shear; using the third metal detector, obtaining a fourth code value when a new head of the rolled piece after the head cutting passes through the third metal detector; and determining the actual head cutting length of the rolled piece according to the first code value, the second code value, the third code value, the fourth code value, the first coordinate distance between the first metal detector and the second metal detector, the second coordinate distance between the second metal detector and the third metal detector, the third coordinate distance between the closing position of the shear blade of the flying shearing shear and the second metal detector, and the fourth coordinate distance between the second metal detector and the position where the head of the rolled piece is located when the shear blade of the flying shearing shear is closed.

[0005] Optionally, the first metal detector is installed between the upstream equipment and the crop shear; the second metal detector is installed at the closed position of the cutting blade of the crop shear or between the closed position of the cutting blade of the crop shear and the actual cropping length; and the third metal detector is installed between the second metal detector and the downstream equipment.

[0006] Optionally, the second metal detector is fixedly installed at the closed position of the cutting blade of the cropping shear or movably installed between the closed position of the cutting blade of the cropping shear and the actual cropping length position of the rolled piece.

[0007] Optionally, determining the actual cutting length of the rolled piece according to the first coding value, the second coding value, the third coding value, the fourth coding value, the first coordinate distance between the first metal detector and the second metal detector, the second coordinate distance between the second metal detector and the third metal detector, the third coordinate distance between the closing position of the cutting shear blade and the second metal detector, and the fourth coordinate distance between the second metal detector and the position of the head of the rolled piece when the cutting shear blade is closed includes: determining a first pulse equivalent corresponding to the first coordinate distance according to the first coding value, the second coding value and the first coordinate distance; determining a first pulse equivalent corresponding to the first coordinate distance according to the third coding value, the fourth coding value and the second coordinate distance. Determine the second pulse equivalent corresponding to the second coordinate distance; based on the second code value, the third coordinate distance between the closing position of the shear blade of the head trimming shear and the second metal detector, and the fourth coordinate distance between the second metal detector and the position of the head of the rolled piece when the shear blade of the head trimming shear is closed; obtain the first coordinate of any point between the first metal detector and the second metal detector, and obtain the second coordinate of any point in the process from the head of the rolled piece arriving at the second metal detector to the new head after head trimming arriving at the third metal detector; and determine the actual head trimming length of the rolled piece based on the first pulse equivalent, the second pulse equivalent, the third coordinate distance, the fourth coordinate distance, the first coordinate and the second coordinate.

[0008] Optionally, the first coordinate is: The second coordinate is:

[0009] Among them, x1 represents the first coordinate, x2 represents the second coordinate, and d 12 Represents the first coordinate distance, d x3 Represents the second coordinate distance, d h ′ represents the fourth coordinate distance.

[0010] Optionally, when the second metal detector is installed at the closed position of the cutting blade of the cutting shear, determining the actual cutting length of the rolled piece according to the first pulse equivalent, the second pulse equivalent, the third coordinate distance, the fourth coordinate distance, the first coordinate and the second coordinate includes: determining the actual cutting length d of the rolled piece according to the following formula: h :make, Fourth coordinate distance: d h ′=dpp h (p x -p2), and from the equation of the line: when hour, Among them, d h =d h ′+d f , d f =0;, we get d h ' 2 +bd h '+c=0, Wherein, dpp1 represents the first pulse equivalent, dpp2 represents the second pulse equivalent, p1 represents the first coding value, p2 represents the second coding value, and p x represents the third code value, p3 represents the fourth code value, dpp h Indicates the set third pulse equivalent, d h ′ represents the fourth coordinate distance, d f Indicates the third coordinate distance, d h Indicates the actual cutting length.

[0011] Optionally, when the second metal detector is installed between the closing position of the shear blade of the cropping shear and the actual cropping length position of the rolled piece, determining the actual cropping length of the rolled piece according to the first pulse equivalent, the second pulse equivalent, the third coordinate distance, the fourth coordinate distance, the first coordinate and the second coordinate includes: determining the actual cropping length d of the rolled piece according to the following formula: h :make, Fourth coordinate distance: d h ′=dpp h (p x -p2); and the equation of the line: when hour, When d h ' 2 +bd h '+c=0, Among them, d h =d h ′+d f , 0 <d f <d h .

[0012] On the other hand, the present invention also provides a control system for online measuring the length of a flying shear, the control system comprising: a setting module for sequentially setting a first metal detector, a second metal detector and a third metal detector between an upstream device and a downstream device; a first acquisition module for using the first metal detector to acquire a first code value corresponding to when the head of the rolled piece passes through the first metal detector; a second acquisition module for using the second metal detector to acquire a second code value corresponding to when the head of the rolled piece passes through the head-cutting flying shear; a third acquisition module for acquiring a third code value corresponding to when the head of the rolled piece is sheared by the head-cutting flying shear; a fourth acquisition module for using the third metal detector to acquire a fourth code value when the new head of the rolled piece after the head-cut passes through the third metal detector; and a determination module for determining the actual head-cutting length of the rolled piece according to the first code value, the second code value, the third code value, the fourth code value, the first coordinate distance between the first metal detector and the second metal detector, the second coordinate distance between the second metal detector and the third metal detector, the third coordinate distance between the closing position of the shear blade of the head-cutting flying shear and the second metal detector, and the fourth coordinate distance between the second metal detector and the position where the head of the rolled piece is located when the shear blade of the head-cutting flying shear is closed.

[0013] On the other hand, the present invention also includes a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the method for online measuring the length of a flying shear head as described.

[0014] In another aspect, the present invention also includes a computer program product, including a computer program, which, when executed by a processor, implements the method for online measuring the length of a flying shear head as described.

[0015] Through the above technical scheme, the embodiment of the present invention sequentially sets the first metal detector, the second metal detector and the third metal detector between the upstream equipment and the downstream equipment to detect the code value when the rolled piece passes through the first metal detector and the head-cutting shear before head cutting, and the code value when the rolled piece passes through the second metal detector and the third metal detector after head cutting. By using these code values, the first coordinate distance between the first metal detector and the second metal detector, the second coordinate distance between the second metal detector and the third metal detector, the third coordinate distance between the closed position of the shear blade of the head-cutting shear and the second metal detector, and the fourth coordinate distance between the second metal detector and the position of the head of the rolled piece when the shear blade of the head-cutting shear is closed, the actual head cutting length of the rolled piece can be indirectly determined.

[0016] The embodiment of the present invention realizes the online accurate measurement of the cut length of the rolled piece, which helps to improve the accuracy of the early prediction of the total length of the rolled piece.

[0017] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a flow chart of a method for online measuring the length of a flying shear head provided by a first embodiment of the present invention;

[0020] Figure 2 is a structural diagram between each device and each metal detector provided by the first embodiment of the present invention;

[0021] Figure 3 is a structural diagram between various devices and various metal detectors provided in a second embodiment of the present invention;

[0022] Figure 4 It is a structural diagram of a control system for online measuring the length of a flying shear head provided by a third embodiment of the present invention.

[0023] Description of Reference Numerals

[0024] 11 first metal detector 12 second metal detector

[0025] 13Third metal detector 21Upstream equipment

[0026] 22 Head cutting shear 23 Downstream equipment DETAILED DESCRIPTION

[0027] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0028] like Figure 1 The first embodiment of the present invention provides a flow chart of a method for online measuring the length of a flying shear head. The method comprises the following steps S10-S15.

[0029] In step S10, a first metal detector, a second metal detector and a third metal detector are sequentially arranged between an upstream device and a downstream device.

[0030] Furthermore, the first metal detector is installed between the upstream equipment and the crop shear; the second metal detector is installed at the closed position of the crop shear or between the closed position of the crop shear and the actual crop length; the third metal detector is installed between the second metal detector and the downstream equipment. Figure 2 , Figure 2 It is a schematic diagram of the structure between various devices and metal detectors provided in the first embodiment of the present invention.

[0031] In some embodiments, specific reference is made to Figure 2 The first metal detector 11 is installed between the upstream device 21 and the head cutting shear 22, and the first metal detector 11 is installed at a position close to the upstream device (usually the upstream frame), for example, 150 mm away from the upstream device. Figure 2 HMD2 in the figure) is installed at the head cutting shear 22 (such as Figure 2 or between the closing position of the cutting blade of the cutting shear 22 and the actual cutting length (reference Figure 3 The third metal detector 13 (such as Figure 2 The HMD3) is located between the head cutting shear 22 and the downstream device 23, and the third metal detector 13 is close to one end of the downstream device 23, for example, 150 mm away from the downstream device.

[0032] Furthermore, the second metal detector is fixedly installed at the closed position of the cutting blade of the cropping shear or movably installed between the closed position of the cutting blade of the cropping shear and the actual cropping length position of the rolled piece.

[0033] In some embodiments, in order to improve the accuracy of detection, the embodiment of the present invention can also fix the second metal tool 12 at the head cutting shear 22. Or in order to increase the scope of application of the method of the present invention, the second metal tool 12 can also be movably installed between the closed position of the shear blade of the head cutting shear 22 and the actual head cutting length of the rolled piece (the specific position can be specifically positioned according to the expected head cutting length, and although there is an error between the actual head cutting length and the expected head cutting length, it is also within a controllable range), which can be applied to processing scenarios when different head cutting lengths are required.

[0034] In step S11, the first metal detector is used to obtain a first code value corresponding to when the head of the rolled piece passes through the first metal detector.

[0035] In some embodiments, when the head of the rolling piece passes through HMD1, HMD1 generates a rising edge and records the first encoding value p1 of the encoder.

[0036] In step S12, the second metal detector is used to obtain a second code value corresponding to when the head of the rolled piece passes through the second metal detector.

[0037] In some embodiments, the workpiece moves from the upstream device to the downstream device, similar to the above step S11. When the head of the workpiece passes through HMD2, HMD2 generates a rising edge, and the recording encoder records the second code value p2 accordingly.

[0038] In step S13, a third coding value corresponding to when the cropping shear shears the head of the rolled piece is obtained.

[0039] In some embodiments, when the head cutting shear 22 cuts the head of the rolled piece, the recording encoder records the third code value p accordingly. x .

[0040] In step S14, the third metal detector is used to obtain a fourth code value when the new head of the rolled piece after head cutting passes through the third metal detector.

[0041] In some embodiments, similarly, when a new head of the rolled piece after head cutting (a new head cutting is generated on the rolled piece) passes through the third metal detector 13, the recording encoder acquires a corresponding fourth encoding value p3.

[0042] The first metal detector 11, the second metal detector 12 and the third metal detector 13 provided in the embodiment of the present invention can specifically be hot metal detectors, which are used to generate a rising edge when the head of the rolled piece (such as a bar) passes through the metal detector, and record the corresponding code value through an encoder installed on the upstream equipment.

[0043] In step S15, the actual cutting length of the rolled piece is determined based on the first coding value, the second coding value, the third coding value, the fourth coding value, the first coordinate distance between the first metal detector and the second metal detector, the second coordinate distance between the second metal detector and the third metal detector, the third coordinate distance between the closed position of the cutting shear blade and the second metal detector, and the fourth coordinate distance between the second metal detector and the position of the head of the rolled piece when the cutting shear blade is closed.

[0044] The position of the first metal detector may be set as the coordinate origin, or a suitable position may be set as the coordinate origin according to actual needs, and the embodiment of the present invention does not impose any specific limitation.

[0045] It should be noted that the “first”, “second”, etc. in the embodiments of the present invention have no practical meanings and are only used to distinguish different parameters.

[0046] Furthermore, the actual cutting length of the rolled piece is determined based on the first coding value, the second coding value, the third coding value, the fourth coding value, the first coordinate distance between the first metal detector and the second metal detector, the second coordinate distance between the second metal detector and the third metal detector, the third coordinate distance between the closing position of the cutting shear blade and the second metal detector, and the fourth coordinate distance between the second metal detector and the position of the head of the rolled piece when the cutting shear blade is closed, and includes the following steps S151-S155.

[0047] S151. Determine a first pulse equivalent corresponding to the first coordinate distance according to the first coding value, the second coding value, and the first coordinate distance.

[0048] In some embodiments, it is assumed that the position of the first metal detector 11 is set as the coordinate origin. Before the head of the rolled piece is cut, the distance between the first encoder 11 and the second encoder 12 is the first coordinate distance, which can be measured in advance and recorded as d 12 When the first code value p1 and the second code value p2 are known, the pulse corresponding to the coordinate distance can be obtained as p2-p1. 12 The pulse equivalent measured by the downstream rack corresponding to the interval

[0049] S152. Determine a second pulse equivalent corresponding to the second coordinate distance according to the third code value, the fourth code value and the second coordinate distance.

[0050] In some embodiments, when the third encoding value p is known x and the fourth code value p3, and the second coordinate distance can be directly measured to obtain d x3 , it can be further determined that the new head of the rolled piece after the flying shear head has passed d x3 The second pulse equivalent measured by the downstream rack corresponding to the interval

[0051] S153. According to the second coding value, the third coding value and the set third pulse equivalent, obtain the fourth coordinate distance of the position of the head of the rolled piece when the second metal detector and the shear blade of the head shear are closed.

[0052] In some embodiments, according to the second coding value p2, the third coding value p x And the third pulse equivalent dpp is set h (i.e., the pulse equivalent corresponding to the fourth coordinate distance of the position of the head of the rolled piece when the second metal detector and the shear blade of the head shear are closed), where the third pulse equivalent dpph The value is unknown and needs to be solved later. According to the calculation formula of pulse equivalent, the calculation formula of the fourth coordinate distance can be listed as d h ′=dpp h (p x -p2).

[0053] S154, obtaining the first coordinates of any point between the first metal detector and the second metal detector, and obtaining the second coordinates of any point in the process from the head of the rolled piece arriving at the second metal detector to the new head after cutting arriving at the third metal detector.

[0054] In some embodiments, the first coordinates of any point between the first metal detector and the second metal detector are obtained, for example The second coordinate of any point in the process from when the head of the rolled piece reaches the second metal detector to when the new head after cutting reaches the third metal detector, for example

[0055] Furthermore, the first coordinate is: The second coordinate is:

[0056] Among them, x1 represents the first coordinate, x2 represents the second coordinate, and d 12 Represents the first coordinate distance, d x3 Represents the second coordinate distance, d h ′ represents the fourth coordinate distance.

[0057] In some embodiments, for the convenience of calculation, the first coordinate is selected as the midpoint coordinate between the first metal detector and the second metal detector in the embodiment of the present invention: The second coordinate is: In existing control methods, dpp1 is usually equivalent to dpp because it cannot be measured later. h This method will have equivalent errors due to the dynamic changes of the front slide and the non-uniformity of the material shape. For measuring the actual cutting length, this equivalence cannot meet the accuracy requirements.

[0058] S155. Determine the actual cut length of the rolled piece based on the first pulse equivalent, the second pulse equivalent, the third coordinate distance, the fourth coordinate distance, the first coordinate, and the second coordinate.

[0059] Further, when the second metal detector is installed at the closed position of the cutting blade of the cutting shear, the determining of the actual cutting length of the rolled piece according to the first pulse equivalent, the second pulse equivalent, the third coordinate distance, the fourth coordinate distance, the first coordinate and the second coordinate comprises: determining the actual cutting length d of the rolled piece according to the following formula: h :make, Fourth coordinate distance: d h ′=dpp h (p x -p2), and from the equation of the line: when hour, When d h ′+bd h '+c=0, Wherein, dpp1 represents the first pulse equivalent, dpp2 represents the second pulse equivalent, p1 represents the first coding value, p2 represents the second coding value, and p x represents the third code value, p3 represents the fourth code value, dpp h Indicates the set third pulse equivalent, d h ′ represents the fourth coordinate distance, d f Indicates the third coordinate distance, d h Indicates the actual cutting length.

[0060] In some embodiments, when the second metal detector is installed at the closing position of the shear blade of the crop shear, Figure 2 The second metal detector 12 is shown installed at the cutting shear 22, which means that d f =0, according to d h =d h ′+d f It can be seen that h =d h ′. Figure 2 Not shown f d h ′.

[0061] Since the pulse equivalent is linearly related to the coordinate distance, let, Fourth coordinate distance: d h ′=dpp h (p x -p2). According to the two-point straight line equation when hour, When x1, x2, y1, y2 and Substituting into the equation of the line, we can simplify and get dh ' 2 +bd h '+c=0, That is, b and c are constants, and the solution of the above quadratic equation d h ' 2 +bd h ′+c=0, the fourth coordinate distance d can be obtained h ', since in this embodiment d h =d h ′+d f , and d f =0, so the fourth coordinate distance d h ' is the actual cutting length d h .

[0062] The embodiment of the present invention is illustrated by actual parameters. When the head of the rolled piece passes through HMD1, HMD1 generates a rising edge, and the first code value p1 of the encoder is recorded as 842252p, where p is a pulse unit. When the head of the rolled piece passes through HMD2, HMD2 generates a rising edge, and the second code value p2 of the encoder is recorded as 855934p. When the shearing action occurs and the shear blade of the flying shear is closed, the third code value p of the encoder is recorded. x When the new head after cutting passes through HMD3, HMD3 generates a rising edge and records the fourth code value p3 of the encoder as 875688p. 12 =1700mm,d x3 =1850mm.

[0063] calculate calculate calculate Calculate d h =620.671mm.

[0064] The second embodiment of the present invention further includes: when the second metal detector is installed between the closing position of the shear blade of the shearing shear and the actual shearing length position of the rolled piece, the determining the actual shearing length of the rolled piece according to the first pulse equivalent, the second pulse equivalent, the third coordinate distance, the fourth coordinate distance, the first coordinate and the second coordinate comprises: determining the actual shearing length d of the rolled piece according to the following formula: h :make, Fourth coordinate distance: d h ′=dpp h (p x -p2) and the equation of the line: when hour, When d h '2 +bd h '+c=0, Among them, d h =d h ′+d f , 0 <d f <d h .

[0065] In some embodiments, when the second metal detector is installed between the shear blade closing position of the head cutting flying shear and the actual head cutting length position, the specific Figure 3 , d f ≠0, can be adjusted according to actual needs, and d can be directly measured f The value of .

[0066] Figure 3 The position of HMD2 can be deviated backward by the third coordinate distance d from the closed position of the shear blade. f , but the condition 0 must be met <d f <d h , to ensure that HMD2 has a rising edge before the flying shear cuts. Similarly, similar to the principle of the first embodiment above, it is only necessary to set d h ′=d h -d f , then we can get the fourth coordinate distance d h ′, thus obtaining h =d h ′+d f The coordinate distance in the embodiment of the present invention is the absolute value of the difference between the coordinates of two devices.

[0067] In some embodiments, the specific principle is the same as the solution process in the first embodiment, and will not be repeated here. The embodiment of the present invention takes actual parameters as an example to illustrate that when the head of the rolled piece passes through HMD1, HMD1 generates a rising edge, and the first code value p1 of the encoder is recorded as 654144p; when the head of the rolled piece passes through HMD2, HMD2 generates a rising edge, and the second code value p2 of the encoder is recorded as 670234p. When the shearing action occurs and the shear blade of the flying shear is closed, the third code value p of the encoder is recorded. x When the new head after cutting passes through HMD3, HMD3 generates a rising edge and records the fourth code value p3 of the encoder as 687580p. 12 =2000mm,d x3 =1850mm, d f =300mm. Calculated

[0068] Get d′ h =320.515mm, d h =d h ′+d f =320.515+300=620.515mm.

[0069] The present invention proposes a method for accurately measuring the length of a flying shearing head online. The method can accurately measure the length of a flying shearing head in real time online, and is used to accurately calculate the change in the length of the rolled piece before and after shearing, thereby preparing for the accurate calculation and prediction of the length of the rolled piece in the subsequent rack, so as to realize intelligent requirements such as full-length shearing.

[0070] The existing automatic control system can set, measure and cut the cutting length, but the accuracy is insufficient. The main problems are: 1) The measurement of the control system serves the cutting, and the measurement needs to be completed before cutting. The measurement afterwards is meaningless; 2) The dynamic change of the forward slip and the non-uniformity of the material shape lead to the inaccurate forward slip value or pulse equivalent estimated by the control system in advance. When shearing as a shearing parameter, there is an error between the measured shearing length and the set length; 3) The control accuracy is insufficient, and there is a shearing error between the calculated shearing length and the actual shearing length; 4) There is an error amplification effect. From the cutting head to the finished product, due to the existence of elongation, the error presents an amplification effect, which can usually be amplified by about 10 to 50 times. Therefore, high-precision measurement is required. At the same time, it is impossible to actually measure the shearing length online with a ruler on site, because the sheared steel heads all fall into the waste frame, and the steel is in a high temperature state and cannot be measured. After the steel cools, the measurement is inaccurate due to the shrinkage. Based on the above needs and problems, the present invention proposes a method for accurately measuring the length of a flying shear head online. This method, by combining the online calibration of the pulse equivalent before and after shearing, can accurately calculate the shear pulse equivalent and accurately align the forward slip amount in time and space, thereby achieving high-precision measurement and meeting intelligent needs.

[0071] like Figure 4The third embodiment of the present invention provides a control system for online measuring the length of a flying shear head. The control system 40 includes: a setting module 401, which is used to set the first metal detector, the second metal detector and the third metal detector in sequence between the upstream equipment and the downstream equipment; a first acquisition module 402, which is used to use the first metal detector to obtain the first code value corresponding to the head of the rolled piece passing through the first metal detector; a second acquisition module 403, which is used to obtain the second code value corresponding to the head of the rolled piece when the head of the rolled piece is sheared by the head shear; a third acquisition module 404, which is used to obtain the third code value corresponding to the head of the rolled piece when the head of the rolled piece is sheared by the head shear; a fourth acquisition module 405, which is used to use the third metal detector to obtain the fourth code value when the new head of the rolled piece after the head cutting passes through the third metal detector; and a determination module 406, which is used to determine the actual head cutting length of the rolled piece according to the first code value, the second code value, the third code value, the fourth code value, the first coordinate distance between the first metal detector and the second metal detector, the second coordinate distance between the second metal detector and the third metal detector, the third coordinate distance between the closed position of the shear blade of the head cutting shear and the second metal detector, and the fourth coordinate distance between the second metal detector and the position where the head of the rolled piece is located when the shear blade of the head cutting shear is closed.

[0072] The implementation principle and effect of the control system for online measuring the length of the flying shear head provided by the third embodiment of the present invention are the same as those of the first and second embodiments mentioned above, and will not be described in detail herein.

[0073] The fourth embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the method for online measuring the length of a flying shear head as described.

[0074] The implementation principle and effect of the computer-readable storage medium provided in the fourth embodiment of the present invention are the same as those of the first and second embodiments mentioned above, and will not be described in detail here.

[0075] A fifth embodiment of the present invention further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the method for online measuring the length of a flying shear head as described.

[0076] The implementation principle and effect of the computer-readable storage medium provided in the fifth embodiment of the present invention are the same as those of the first and second embodiments described above, and will not be described in detail herein.

[0077] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0078] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0079] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0080] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0081] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0082] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0083] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0084] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0085] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for online measuring the length of a flying shear head, characterized in that: The method comprises: The first metal detector, the second metal detector and the third metal detector are sequentially arranged between the upstream device and the downstream device; Using the first metal detector, obtaining a first code value corresponding to when the head of the rolled piece passes through the first metal detector; Using the second metal detector, obtaining a second code value corresponding to when the head of the rolled piece passes through the second metal detector; Obtaining a third code value corresponding to when the head of the rolled piece is sheared by the head shear; Using the third metal detector, obtaining a fourth code value when a new head of the rolled piece after head cutting passes through the third metal detector; and The actual cutting length of the rolled piece is determined based on the first coding value, the second coding value, the third coding value, the fourth coding value, the first coordinate distance between the first metal detector and the second metal detector, the second coordinate distance between the second metal detector and the third metal detector, the third coordinate distance between the closed position of the cutting shear blade and the second metal detector, and the fourth coordinate distance between the second metal detector and the position of the head of the rolled piece when the cutting shear blade is closed.

2. The method according to claim 1, characterized in that in, The first metal detector is installed between the upstream equipment and the crop shear, the second metal detector is installed at the closed position of the cutting blade of the crop shear or between the closed position of the cutting blade of the crop shear and the actual cropping length, and the third metal detector is installed between the second metal detector and the downstream equipment.

3. The method according to claim 2, characterized in that The second metal detector is fixedly installed at the closed position of the cutting blade of the cropping shear or movably installed between the closed position of the cutting blade of the cropping shear and the actual cropping length position of the rolled piece.

4. The method according to claim 2, characterized in that: Determining the actual cutting length of the rolled piece according to the first code value, the second code value, the third code value, the fourth code value, the first coordinate distance between the first metal detector and the second metal detector, the second coordinate distance between the second metal detector and the third metal detector, the third coordinate distance between the closed position of the cutting shear blade and the second metal detector, and the fourth coordinate distance between the second metal detector and the position of the head of the rolled piece when the cutting shear blade is closed comprises: Determine a first pulse equivalent corresponding to the first coordinate distance according to the first code value, the second code value and the first coordinate distance; Determine a second pulse equivalent corresponding to the second coordinate distance according to the third code value, the fourth code value and the second coordinate distance; According to the second code value, the third code value, and the set third pulse equivalent, a fourth coordinate distance of the position of the head of the rolled piece when the second metal detector and the shear blade of the head shear are closed is obtained; Obtaining the first coordinate of any point between the first metal detector and the second metal detector, and obtaining the second coordinate of any point in the process from the head of the rolled piece arriving at the second metal detector to the new head after the cut head arriving at the third metal detector; and, The actual cut length of the rolled piece is determined based on the first pulse equivalent, the second pulse equivalent, the third coordinate distance, the fourth coordinate distance, the first coordinate, and the second coordinate.

5. The method according to claim 4, characterized in that The first coordinate is: The second coordinate is: Among them, x1 represents the first coordinate, x2 represents the second coordinate, and d 12 Represents the first coordinate distance, d x3 Represents the second coordinate distance, d h ′ represents the fourth coordinate distance.

6. The method according to claim 5, characterized in that When the second metal detector is installed at the closing position of the shear blade of the crop shear, Determining the actual cut length of the rolled piece according to the first pulse equivalent, the second pulse equivalent, the third coordinate distance, the fourth coordinate distance, the first coordinate, and the second coordinate comprises: According to the following formula, the actual cutting length d of the rolled piece is determined: h : make, Fourth coordinate distance: d h ′=dpp h (p x -p2), and According to the equation of a straight line: when hour, Among them, d h =d h ′+d f , d f =0; then we get d h ' 2 +bd h '+c=0, Wherein, dpp1 represents the first pulse equivalent, dpp2 represents the second pulse equivalent, p1 represents the first coding value, p2 represents the second coding value, and p x represents the third code value, p3 represents the fourth code value, dpp h Indicates the set third pulse equivalent, d h ′ represents the fourth coordinate distance, d f Indicates the third coordinate distance, d h Indicates the actual cutting length.

7. The method according to claim 5, characterized in that When the second metal detector is installed between the closing position of the shear blade of the crop shear and the actual crop length position of the rolled piece, Determining the actual cut length of the rolled piece according to the first pulse equivalent, the second pulse equivalent, the third coordinate distance, the fourth coordinate distance, the first coordinate, and the second coordinate comprises: According to the following formula, the actual cutting length d of the rolled piece is determined: h : make, Fourth coordinate distance: d h ′=dpp h (p x -p2); and Equation of a Line: when hour, When d h ' 2 +bd h '+c=0, Among them, d h =d h ′+d f , 0 <d f <d h .

8. A control system for online measurement of the length of a flying shear head, characterized in that: The control system comprises: A setting module, used for sequentially setting the first metal detector, the second metal detector and the third metal detector between the upstream device and the downstream device; A first acquisition module, used to use the first metal detector to acquire a first code value corresponding to when the head of the rolled piece passes through the first metal detector; A second acquisition module is used to use the second metal detector to acquire a second code value corresponding to the head of the rolled piece passing through the head cutting flying shear; A third acquisition module is used to obtain a third code value corresponding to when the head of the rolled piece is sheared by the head shear; A fourth acquisition module is used to use the third metal detector to acquire a fourth code value when a new head of the rolled piece after head cutting passes through the third metal detector; and A determination module is used to determine the actual cutting length of the rolled piece based on the first coding value, the second coding value, the third coding value, the fourth coding value, the first coordinate distance between the first metal detector and the second metal detector, the second coordinate distance between the second metal detector and the third metal detector, the third coordinate distance between the closing position of the cutting shear blade and the second metal detector, and the fourth coordinate distance between the second metal detector and the position of the head of the rolled piece when the cutting shear blade is closed.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method for online measuring the length of a flying shear head as described in any one of claims 1 to 7.

10. A computer program product, characterized in that The invention comprises a computer program, which, when executed by a processor, implements the method for online measuring the length of a flying shear head as claimed in any one of claims 1 to 7.

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