Control method and device for length-measuring shearing of cut-to-length shear

Abstract

The invention discloses a control method and device for length measurement shearing of a fixed-length shear, and the method comprises the steps: in a fixed-length process, obtaining a first length of a steel plate measured by a length measurement device of a fixed-length machine encoder in real time, and obtaining a second length of the steel plate measured by a laser range finder; according to the first length, the second length and the first deviation threshold value, whether the sizing condition is met or not is judged; if the sizing condition is met, acquiring a first stable length of the steel plate measured by a length measuring device of a sizing machine encoder after the sizing is finished, and acquiring a second stable length of the steel plate measured by a laser range finder; and according to the first stable length, the second stable length, the second deviation threshold value and a preset steel plate set value, steel plate shearing is controlled. Thus, real-time double verification detection of the steel plate fixed length in the steel plate fixed length stage is achieved, and when one set of length measuring device is abnormal, the other set of length measuring device can be rapidly switched to. Meanwhile, steel plate sizing precision is guaranteed, fault processing time is shortened, and production line operation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of steel rolling, and in particular to a control method and device for length-measuring shearing. Background Art

[0002] The sizing machine is one of the most important equipment in the medium and thick plate sizing shearing system. The sizing machine uses encoder counting to realize the steel plate sizing function. When the L2 system sends the steel plate length setting information, the sizing machine moves in the specified direction driven by the motor. The encoder installed on the frame measures the number of pulses to calculate the travel distance of the sizing machine.

[0003] The accuracy of the steel plate length measured by the sizing machine directly determines whether the steel plate length meets the customer's contract deviation requirements. If the sizing plate is too short, it cannot meet the contract requirements; if the sizing plate is too long, it will affect the company's economic benefits. In the actual production process, due to the combined influence of various factors such as equipment vibration and wear, it is difficult to ensure the sizing accuracy of the steel plate; and sometimes when the equipment fails, it is difficult for the operator to detect it. The abnormal length of the steel plate is often discovered only after the quality inspector reviews it, which seriously affects the operating efficiency and production rhythm of the production line. Summary of the invention

[0004] In view of the above problems, the present invention provides a control method and device for cut-to-length shearing.

[0005] According to a first aspect of the present invention, a control method for cut-to-length shearing is provided, comprising:

[0006] During the sizing process, the first length of the steel plate measured by the length measuring device of the sizing machine encoder is obtained in real time, and the second length of the steel plate measured by the laser rangefinder is obtained;

[0007] Determining whether a length-setting condition is met according to the first length, the second length, and a first deviation threshold;

[0008] If the sizing condition is met, after the sizing is completed, the first stable length of the steel plate measured by the length measuring device of the sizing machine encoder is obtained, and the second stable length of the steel plate measured by the laser rangefinder is obtained;

[0009] The shearing of the steel plate is controlled according to the first stable length, the second stable length, the second deviation threshold and the preset steel plate setting value.

[0010] Optionally, judging whether a sizing condition is met according to the first length, the second length and a first deviation threshold includes:

[0011] determining a first deviation according to the first length and the second length;

[0012] If the first deviation is less than the first deviation threshold, the sizing condition is met.

[0013] Optionally, judging whether a sizing condition is met according to the first length, the second length and a first deviation threshold includes:

[0014] determining a first deviation according to the first length and the second length;

[0015] If the first deviation is greater than or equal to the first deviation threshold, and within a preset delay time, the first deviation is less than the first deviation threshold, then the sizing condition is met.

[0016] Optionally, controlling the shearing of the steel plate according to the first stable length, the second stable length, the second deviation threshold and a preset steel plate setting value includes:

[0017] determining a second deviation according to the first stable length and the second stable length;

[0018] If the second deviation is less than the second deviation threshold, determining a target stable length from the first stable length and the second stable length;

[0019] If the target stable length is greater than the set value of the steel plate, the steel plate is sheared.

[0020] Optionally, the method further comprises:

[0021] If the second deviation is greater than or equal to the second deviation threshold, an alarm message is sent.

[0022] Optionally, the method further comprises:

[0023] If the target stable length is less than or equal to the steel plate set value, the steel plate shearing sequence is terminated.

[0024] Optionally, the first deviation threshold is greater than the second deviation threshold.

[0025] According to a second aspect of the present invention, there is provided a control device for cutting to length and measuring length, comprising:

[0026] The first acquisition module is used to obtain in real time during the sizing process the first length of the steel plate measured by the length measuring device of the sizing machine encoder and the second length of the steel plate measured by the laser rangefinder;

[0027] A judging module, configured to judge whether a length-setting condition is met according to the first length, the second length and a first deviation threshold;

[0028] A second acquisition module is used to obtain a first stable length of the steel plate measured by the length measuring device of the sizing machine encoder after the sizing is completed if the sizing condition is met, and to obtain a second stable length of the steel plate measured by the laser rangefinder;

[0029] A control module is used to control the shearing of the steel plate according to the first stable length, the second stable length, a second deviation threshold and a preset steel plate setting value.

[0030] According to a third aspect of the present invention, a controller is provided, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the aforementioned control method for cut-to-length and length-measuring shearing when executing the computer program.

[0031] According to a fourth aspect of the present invention, a cut-to-length shear is provided, comprising a cut-to-length shear frame, a cut-to-length machine arranged on the cut-to-length shear frame, a laser rangefinder arranged on the cut-to-length shear frame, and a controller, wherein the controller executes the aforementioned control method for length measurement and shearing of the cut-to-length shear.

[0032] The above one or more technical solutions in the embodiments of this specification have at least the following technical effects:

[0033] The embodiment of this specification provides a control method and device for length-measurement shearing of cut-to-length shearing. During the cut-to-length process, the first length of the steel plate measured by the length measuring device of the cut-to-length machine encoder is obtained in real time, and the second length of the steel plate measured by the laser rangefinder is obtained; according to the first length, the second length and the first deviation threshold, it is judged whether the cut-to-length condition is met; if the cut-to-length condition is met, after the cut-to-length is completed, the first stable length of the steel plate measured by the length measuring device of the cut-to-length machine encoder is obtained, and the second stable length of the steel plate measured by the laser rangefinder is obtained; according to the first stable length, the second stable length, the second deviation threshold and the preset steel plate setting value, the steel plate shearing is controlled. In this way, the real-time double verification and detection of the cut-to-length length of the steel plate is realized in the cut-to-length stage of the steel plate. When one set of the length measuring device is abnormal, it can be quickly switched to another set of the length measuring device, effectively avoiding the problem of excessive length of the steel plate. At the same time, the cut-to-length accuracy of the steel plate is guaranteed, the fault handling time is reduced, and the production line operation efficiency is improved.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Also, throughout the accompanying drawings, the same reference figures are used to represent the same components. In the drawings:

[0036] Figure 1 A flow chart of a control method for cutting to length and measuring length in an embodiment of the present invention is shown.

[0037] Figure 2 A schematic diagram of a cut-to-length shearing method for measuring length in an embodiment of the present invention is shown.

[0038] Figure 3 A block diagram of a control device for cut-to-length shearing and length-measuring shearing according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Combination Figure 1As shown, the present invention provides a control method for cut-to-length shearing, and the control method for cut-to-length shearing includes steps 101 to 104:

[0044] Step 101: in the sizing process, obtaining in real time a first length of the steel plate measured by a length measuring device of an encoder of a sizing machine, and obtaining a second length of the steel plate measured by a laser rangefinder;

[0045] In this embodiment, the method is used for cutting to length, combined with Figure 2 As shown, the cut-to-length shear comprises a cut-to-length shear frame, a cut-to-length machine arranged on the cut-to-length shear frame, a laser rangefinder arranged on the cut-to-length shear frame, and a controller.

[0046] Among them, a laser rangefinder is installed on the cut-to-length shear frame, and a laser reflector is installed on the cut-to-length machine to facilitate length measurement by the laser rangefinder.

[0047] The laser rangefinder signal is connected to the controller of the cut-to-length shear to obtain the length information of the steel plate measured by the newly added laser rangefinder.

[0048] During the sizing process of the steel plate, the steel plate is placed on the conveyor roller. The sizing machine runs from the starting point to the end point. The end point is determined according to the set value of the steel plate. During the sizing process of the sizing machine, the length of the steel plate measured by the encoder length measuring device of the sizing machine, that is, the first length, is obtained in real time. At the same time, the second length of the steel plate measured by the laser rangefinder is also obtained in real time.

[0049] Step 102: judging whether a length determination condition is met according to the first length, the second length and a first deviation threshold;

[0050] In this embodiment, there are two steel plate length measuring devices, namely a cut-to-length machine and a laser rangefinder. One of the length measuring devices is used as the main length measuring device, and the other is used as a redundant standby. Once the main length measuring device is abnormal, it can be quickly switched to the other length measuring device. Optionally, the cut-to-length machine can be used as the main length measuring device and the laser rangefinder can be used as a redundant standby; or the laser rangefinder can be used as the main length measuring device and the cut-to-length machine can be used as a redundant standby. This embodiment is not limited to this. This embodiment is only described with the cut-to-length machine as the main length measuring device.

[0051] In order to detect abnormalities of the length-cutting machine in time, during the length-cutting process, judgments will be made based on the first length, the second length and the first deviation threshold, including:

[0052] Determine a first deviation based on the first length and the second length; if the first deviation is less than the first deviation threshold, the length determination condition is met. or

[0053] determining a first deviation according to the first length and the second length;

[0054] If the first deviation is greater than or equal to the first deviation threshold, and within a preset delay time, the re-acquired first deviation is less than the first deviation threshold, then the sizing condition is met.

[0055] It should be noted that, during the sizing process, if the sizing conditions are met, it means that the sizing machine has no abnormalities and can continue to sizing. Among them, the first deviation refers to the absolute value of the difference between the first length and the second length. If the first deviation is less than the first deviation threshold, it means that the lengths of the steel plates measured by the sizing machine and the laser rangefinder are not much different and are within a reasonable range. On the contrary, if the first deviation is greater than or equal to the first deviation threshold, it means that the lengths of the steel plates measured by the sizing machine and the laser rangefinder are quite different, and the sizing machine may be abnormal. At this time, the automatic cutting sequence will be terminated, and the sizing machine and the laser rangefinder need to be checked.

[0056] Considering that the sizing machine may vibrate during operation, the data measured in a short time may fluctuate, and the first deviation may be greater than or equal to the first deviation threshold in a short time. Therefore, in this embodiment, when the first deviation is greater than or equal to the first deviation threshold, and the first deviation is less than the first deviation threshold within the preset delay time, it means that the first deviation falls back to a reasonable range, and the steel plate can still be automatically sized.

[0057] Optionally, the first deviation may be 25 mm and the preset delay time may be 2 seconds.

[0058] Step 103: if the sizing condition is met, after the sizing is completed, a first stable length of the steel plate measured by the length measuring device of the sizing machine encoder is obtained, and a second stable length of the steel plate measured by the laser rangefinder is obtained;

[0059] In this embodiment, the end of the sizing means that the sizing machine reaches the end point and stops moving. At this time, the first stable length of the steel plate measured by the sizing machine encoder length measuring device is obtained, and the second stable length of the steel plate measured by the laser rangefinder is obtained. The first stable length and the second stable length are fixed values ​​for the final length measurement.

[0060] Step 104: Controlling the shearing of the steel plate according to the first stable length, the second stable length, the second deviation threshold and a preset steel plate setting value.

[0061] In this embodiment, after the sizing is completed, the second deviation will be determined based on the first stable length and the second stable length; the second deviation is the absolute value of the difference between the first stable length and the second stable length. Then the second deviation is compared with the second deviation threshold. If the second deviation is less than the second deviation threshold, it means that the error of the steel plate length measured by the sizing machine and the laser rangefinder is small. If the second deviation is greater than or equal to the second deviation threshold, it means that the error is large, and an alarm message can be sent to trigger an alarm and terminate the automatic sizing sequence of the steel plate. It should be noted that the first deviation threshold is greater than the second deviation threshold. Because during the sizing process, the sizing machine is moving, which makes the error between the two measurements larger, and after the sizing is completed, the sizing machine is stable and the error between the two measurements is smaller. Therefore, the first deviation threshold is greater than the second deviation threshold.

[0062] Then, the target stable length is determined from the first stable length and the second stable length; the target stable length refers to the length of the steel plate measured by the main length measuring device. In this embodiment, the sizing machine is the main length measuring device, so the second stable length is used as the target stable length.

[0063] If the target stable length is greater than the set value of the steel plate, it means that the cut length of the steel plate meets the length required by the customer, and the steel plate can be sheared. If the target stable length is less than or equal to the set value of the steel plate, it means that the cut length of the steel plate does not meet the length required by the customer, and the steel plate shearing sequence should be terminated.

[0064] For example:

[0065] A laser distance meter is installed on the cut-to-length shear frame, and a laser reflector is installed on the cut-to-length machine.

[0066] Connect the laser distance meter signal to the cut-to-length shear controller, compile a PLC program, and obtain the length information of the steel plate measured by the newly added laser distance meter.

[0067] Create two sets of length measuring device switching selection buttons, a deviation value setting window during the length setting process, a preset delay time setting window during the length setting process, and a deviation value setting window after the length setting is completed on the HMI operation screen. Set the first deviation threshold to 25mm, the second deviation threshold to 10mm, and the preset delay time to 2s.

[0068] A comprehensive determination program is compiled based on a first deviation between a first length of the steel plate measured by a length measuring device of an encoder of a sizing machine and a second length of the steel plate measured by a laser rangefinder.

[0069] During the steel plate sizing process, if the first deviation is greater than 25mm and within the 2s delay time, the deviation returns to the reasonable range, that is, less than 25mm, the steel plate will still be automatically sized. Otherwise, the automatic cutting sequence will be terminated, that is, the sizing shear will stop working. After the fault is checked and tested normally, shearing will be carried out again.

[0070] After the steel plate is sizing, if the second deviation is greater than 10mm, an alarm will be triggered to terminate the automatic sizing sequence of the steel plate; if the second deviation is less than or equal to 10mm and the measured second stable length is greater than the set value of the steel plate, it is considered that the sizing length of the steel plate meets the requirements.

[0071] Install sound and light alarm indicator lights on the operating table, and connect the signals to PLC for alarm indication.

[0072] In summary, the embodiment of this specification provides a control method for length-measuring shearing. During the sizing process, the first length of the steel plate measured by the length measuring device of the encoder of the sizing machine is obtained in real time, and the second length of the steel plate measured by the laser rangefinder is obtained; according to the first length, the second length and the first deviation threshold, it is judged whether the sizing condition is met; if the sizing condition is met, after the sizing is completed, the first stable length of the steel plate measured by the length measuring device of the encoder of the sizing machine is obtained, and the second stable length of the steel plate measured by the laser rangefinder is obtained; according to the first stable length, the second stable length, the second deviation threshold and the preset steel plate setting value, the steel plate shearing is controlled. In this way, the real-time double verification and detection of the sizing length of the steel plate is realized in the sizing stage of the steel plate. When one set of the length measuring device is abnormal, it can be quickly switched to another set of the length measuring device, effectively avoiding the problem of excessive length of the steel plate. At the same time, the sizing accuracy of the steel plate is guaranteed, the fault handling time is reduced, and the production line operation efficiency is improved.

[0073] Based on the same inventive concept, Figure 3 As shown, an embodiment of the present invention further provides a control device for cutting to length and measuring length, comprising:

[0074] The first acquisition module is used to obtain in real time during the sizing process the first length of the steel plate measured by the length measuring device of the sizing machine encoder and the second length of the steel plate measured by the laser rangefinder;

[0075] A judging module, configured to judge whether a length-setting condition is met according to the first length, the second length and a first deviation threshold;

[0076] A second acquisition module is used to obtain a first stable length of the steel plate measured by the length measuring device of the sizing machine encoder after the sizing is completed if the sizing condition is met, and to obtain a second stable length of the steel plate measured by the laser rangefinder;

[0077] A control module is used to control the shearing of the steel plate according to the first stable length, the second stable length, a second deviation threshold and a preset steel plate setting value.

[0078] Optionally, the judging module is further used for:

[0079] determining a first deviation according to the first length and the second length;

[0080] If the first deviation is less than the first deviation threshold, the sizing condition is met.

[0081] Optionally, the judgment module is further used to:

[0082] determining a first deviation according to the first length and the second length;

[0083] If the first deviation is greater than or equal to the first deviation threshold, and within a preset delay time, the first deviation is less than the first deviation threshold, then the sizing condition is met.

[0084] Optionally, the control module is further configured to:

[0085] determining a second deviation according to the first stable length and the second stable length;

[0086] If the second deviation is less than the second deviation threshold, determining a target stable length from the first stable length and the second stable length;

[0087] If the target stable length is greater than the set value of the steel plate, the steel plate is sheared.

[0088] Optionally, the control module is further configured to:

[0089] If the second deviation is greater than or equal to the second deviation threshold, an alarm message is sent.

[0090] Optionally, the control module is further configured to:

[0091] If the target stable length is less than or equal to the steel plate set value, the steel plate shearing sequence is terminated.

[0092] Optionally, the first deviation threshold is greater than the second deviation threshold.

[0093] In summary, the embodiment of this specification provides a control device for cutting to length and measuring length. During the cutting process, the first length of the steel plate measured by the length measuring device of the encoder of the cutting machine is obtained in real time, and the second length of the steel plate measured by the laser rangefinder is obtained; according to the first length, the second length and the first deviation threshold, it is judged whether the cutting condition is met; if the cutting condition is met, after the cutting is completed, the first stable length of the steel plate measured by the length measuring device of the encoder of the cutting machine is obtained, and the second stable length of the steel plate measured by the laser rangefinder is obtained; according to the first stable length, the second stable length, the second deviation threshold and the preset steel plate setting value, the cutting of the steel plate is controlled. In this way, the real-time double verification and detection of the cut-to-length length of the steel plate is realized in the cutting stage of the steel plate. When one set of the length measuring device is abnormal, it can be quickly switched to another set of the length measuring device, effectively avoiding the problem of excessive length of the steel plate. At the same time, the cutting accuracy of the steel plate is guaranteed, the fault handling time is reduced, and the production line operation efficiency is improved.

[0094] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the control device for cut-to-length shearing described above can refer to the corresponding process in the aforementioned method, and will not be elaborated herein.

[0095] Based on the same inventive concept, this embodiment provides a controller, including a control device for cut-to-length, length-measuring and cutting, a memory, a processor and a communication unit. The memory stores machine-readable instructions executable by the processor. When the controller is running, the processor and the memory communicate through a bus, the processor executes the machine-readable instructions, and executes a control method for cut-to-length, length-measuring and cutting.

[0096] The memory, the processor, and the communication unit are electrically connected to each other directly or indirectly to achieve signal transmission or interaction. For example, these elements can be electrically connected to each other through one or more communication buses or signal lines. The control device for cutting to length, measuring length and shearing includes at least one software function module that can be stored in the memory in the form of software or firmware. The processor is used to execute the executable module stored in the memory (for example, the software function module or computer program included in the control device for cutting to length, measuring length and shearing).

[0097] Among them, the memory can be, but is not limited to, random access memory (Random Access Memory, RAM), read-only memory (Read On ly Memory, ROM), programmable read-only memory (Programmable Read-Only Memory, PROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, EPROM), electrically erasable read-only memory (Electrical Erasable Programmable Read-Only Memory, EEPROM), etc.

[0098] In some embodiments, the processor is used to perform one or more functions described in the present embodiment. In some embodiments, the processor may include one or more processing cores (e.g., a single-core processor (S) or a multi-core processor (S)). By way of example only, the processor may include a central processing unit (CPU), an application specific integrated circuit (ASIC), an application specific instruction set processor (ASIC), a graphics processing unit (GPU), a physical processing unit (PPU), a digital signal processor (DSP), a field programmable gate array (FPGA), a programmable logic device (PLD), a controller, a microcontroller unit, a reduced instruction set computer (RISC) or a microprocessor, or any combination thereof.

[0099] For ease of explanation, only one processor is described in the controller. However, it should be noted that the controller in this embodiment may also include multiple processors, so the steps performed by one processor described in this embodiment may also be performed jointly or individually by multiple processors. For example, if the processor of the server performs step A and step B, it should be understood that step A and step B may also be performed jointly by two different processors or individually in one processor. For example, a processor performs step A and a second processor performs step B, or the processor and the second processor perform steps A and B together.

[0100] In this embodiment, the memory is used to store the program, and the processor is used to execute the program after receiving the execution instruction. The process definition method disclosed in any implementation of this embodiment can be applied to the processor, or implemented by the processor.

[0101] The communication unit is used to establish a communication connection between the controller and other devices through the network, and to send and receive data through the network.

[0102] In some embodiments, the network may be any type of wired or wireless network, or a combination thereof. As examples only, the network may include a wired network, a wireless network, an optical fiber network, a telecommunications network, an intranet, the Internet, a local area network (LAN), a wide area network (WAN), a wireless local area network (WLAN), a metropolitan area network (MAN), a wide area network (WAN), a public switched telephone network (PSTN), a Bluetooth network, a ZigBee network, or a near field communication (NFC) network, or any combination thereof.

[0103] In this embodiment, the controller may be, but is not limited to, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), etc. This embodiment does not impose any restriction on the specific type of the controller.

[0104] Based on the same inventive concept, a cut-to-length shear is also provided, comprising a cut-to-length shear frame, a cut-to-length machine arranged on the cut-to-length shear frame, a laser rangefinder arranged on the cut-to-length shear frame, and a controller, wherein the controller executes the aforementioned control method for measuring the length and cutting the cut-to-length shear. The specific method content is referred to above and will not be repeated here.

[0105] The above are only various embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A control method for cutting to length and measuring length, It is characterized in that include: During the sizing process, the first length of the steel plate measured by the length measuring device of the sizing machine encoder is obtained in real time, and the second length of the steel plate measured by the laser rangefinder is obtained; Determining whether a length-setting condition is met according to the first length, the second length, and a first deviation threshold; If the sizing condition is met, after the sizing is completed, the first stable length of the steel plate measured by the length measuring device of the sizing machine encoder is obtained, and the second stable length of the steel plate measured by the laser rangefinder is obtained; The shearing of the steel plate is controlled according to the first stable length, the second stable length, the second deviation threshold and the preset steel plate setting value.

2. The method according to claim 1, It is characterized in that The determining whether a length-setting condition is met according to the first length, the second length, and a first deviation threshold includes: determining a first deviation according to the first length and the second length; If the first deviation is less than the first deviation threshold, the sizing condition is met.

3. The method according to claim 1, It is characterized in that The determining whether a length-setting condition is met according to the first length, the second length, and a first deviation threshold includes: determining a first deviation according to the first length and the second length; If the first deviation is greater than or equal to the first deviation threshold, and within a preset delay time, the first deviation is less than the first deviation threshold, then the sizing condition is met.

4. The method according to claim 1, It is characterized in that The controlling the shearing of the steel plate according to the first stable length, the second stable length, the second deviation threshold and the preset steel plate setting value comprises: determining a second deviation according to the first stable length and the second stable length; If the second deviation is less than the second deviation threshold, determining a target stable length from the first stable length and the second stable length; If the target stable length is greater than the set value of the steel plate, the steel plate is sheared.

5. The method according to claim 4, It is characterized in that The method further comprises: If the second deviation is greater than or equal to the second deviation threshold, an alarm message is sent.

6. The method according to claim 4, It is characterized in that The method further comprises: If the target stable length is less than or equal to the steel plate set value, the steel plate shearing sequence is terminated.

7. The method according to claim 1, It is characterized in that The first deviation threshold is greater than the second deviation threshold.

8. A control device for cutting to length and measuring length, It is characterized in that include: The first acquisition module is used to obtain in real time during the sizing process the first length of the steel plate measured by the length measuring device of the sizing machine encoder and the second length of the steel plate measured by the laser rangefinder; A judging module, configured to judge whether a length-setting condition is met according to the first length, the second length and a first deviation threshold; A second acquisition module is used to obtain a first stable length of the steel plate measured by the length measuring device of the sizing machine encoder after the sizing is completed if the sizing condition is met, and to obtain a second stable length of the steel plate measured by the laser rangefinder; A control module is used to control the shearing of the steel plate according to the first stable length, the second stable length, a second deviation threshold and a preset steel plate setting value.

9. A controller, It is characterized in that The controller comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the control method for cut-to-length cutting and measuring length cutting as described in any one of claims 1 to 7 when executing the computer program.

10. A cut-to-length shear, It is characterized in that The invention comprises a cut-to-length shear frame, a cut-to-length machine arranged on the cut-to-length shear frame, a laser rangefinder arranged on the cut-to-length shear frame and a controller, wherein the controller executes the control method for cut-to-length shearing and length measurement according to any one of claims 1 to 7.

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