A pinch roll precision testing method, device, medium and equipment

Abstract

The application discloses a pinch roll precision testing method, device, medium and equipment. The method comprises the following steps: in the case of replacing the pinch roll, opening the roll gap to a first distance, controlling the position of the upper pinch roll, closing the roll gap to a second distance, executing a pressure zeroing step, and then closing the roll gap to a third distance; controlling the pressure of the upper pinch roll, executing a pressure change step: changing the pressure on both sides of the upper pinch roll from a first pressure to a second pressure, and then changing the pressure from the second pressure to the first pressure; obtaining a first roll gap deviation and a second roll gap deviation during the execution of the pressure change step; and if the first roll gap deviation and the second roll gap deviation are less than or equal to a deviation threshold, the precision of the pinch roll meets the requirements. The application can quickly judge the precision state of the newly replaced pinch roll.

Description

Technical Field

[0001] This application relates to the field of strip coiling technology, and in particular to a method, apparatus, medium, and equipment for testing the accuracy of pinch rolls. Background Technology

[0002] Pinch rolls are key equipment for strip coiling, and their accuracy affects the quality of the strip and the coiling stability. After replacing the rolls, problems such as insufficient installation level can lead to a decrease in the accuracy of the pinch rolls.

[0003] Currently, once the new rollers are replaced and the calibration is successful, they can be put into use. During use, the accuracy of the pinch rollers is mainly identified by the quality of the strip steel, which has a certain lag. Summary of the Invention

[0004] The embodiments of this application provide a method, apparatus, medium, and equipment for testing the accuracy of pinch rolls, which solves the technical problem of a certain lag when identifying whether the accuracy of pinch rolls has problems through reverse identification of strip quality.

[0005] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0006] According to a first aspect of this application, a method for testing the accuracy of a pinch roll is provided, the pinch roll comprising an upper pinch roll and a lower pinch roll, wherein a roll gap is formed between the upper pinch roll and the lower pinch roll, the method comprising: When replacing the pinch roll, the roll gap is opened to a first distance, the position of the upper pinch roll is controlled, the roll gap is closed to a second distance, a pressure zeroing step is performed, and then the roll gap is closed to a third distance. The pressure of the upper pinch roller is controlled by performing a pressure change step: changing the pressure on both sides of the upper pinch roller from a first pressure to a second pressure, and then changing the pressure from the second pressure back to the first pressure; The first roll gap deviation and the second roll gap deviation are obtained during the execution pressure change step. The first roll gap deviation is the roll gap deviation on both sides of the pinch roll, and the second roll gap deviation is the roll gap deviation when the pressure on one side of the pinch roll changes to the target pressure. If the first roll gap deviation and the second roll gap deviation are less than or equal to the deviation threshold, then the accuracy of the pinch roll meets the requirements.

[0007] In some embodiments of this application, based on the foregoing scheme, closing the roll gap to the second distance includes: Gain the first speed; The roll gap is closed to the second distance at the first speed; Closing the roll gap to the third distance includes: Obtain the second speed; The roll gap is closed to the third distance at the second speed.

[0008] In some embodiments of this application, based on the aforementioned scheme, the first distance is 520mm, the second distance is 20mm, the third distance is 2mm, the first speed is 100mm / s, and the second speed is 1.5mm / s.

[0009] In some embodiments of this application, based on the foregoing scheme, the step of clearing the execution pressure includes: The pressure on both sides of the upper pinch roller is zeroed, and the pressure fluctuation of the upper pinch roller is obtained; If the absolute value of the pressure fluctuation is greater than or equal to the pressure threshold, then return to the step of zeroing the pressure on both sides of the upper pinch roller until the absolute value of the pressure fluctuation is less than the pressure threshold.

[0010] In some embodiments of this application, based on the foregoing scheme, the step of changing the pressure on both sides of the upper pinch roller from a first pressure to a second pressure, and then from the second pressure back to the first pressure, includes: According to the target pressure change rate, the pressure on both sides of the upper pinch roller is increased sequentially from the first pressure to the third pressure, the fourth pressure, the fifth pressure and the second pressure, and then decreased sequentially from the second pressure to the fifth pressure, the fourth pressure, the third pressure and the first pressure.

[0011] In some embodiments of this application, based on the aforementioned scheme, the first pressure is 10KN, the second pressure is 90KN, the third pressure is 30KN, the fourth pressure is 50KN, the fifth pressure is 70KN, and the target pressure change rate is 2-5KN / s.

[0012] In some embodiments of this application, based on the foregoing scheme, after obtaining the first roll gap deviation and the second roll gap deviation during the execution pressure change step, the method further includes: If the first roll gap deviation or the second roll gap deviation is greater than the deviation threshold, then the accuracy of the pinch roll does not meet the requirements.

[0013] According to a second aspect of this application, a clamping roller accuracy testing device is provided, the clamping roller including an upper clamping roller and a lower clamping roller, a roller gap being formed between the upper clamping roller and the lower clamping roller, the device comprising: The first change unit, when replacing the pinch roller, opens the roller gap to a first distance, controls the position of the upper pinch roller, closes the roller gap to a second distance, performs a pressure zeroing step, and then closes the roller gap to a third distance. The first execution unit performs pressure control on the upper pinch roller and executes the pressure change step: changing the pressure on both sides of the upper pinch roller from the first pressure to the second pressure, and then changing the pressure from the second pressure back to the first pressure; The first acquisition unit acquires the first roll gap deviation and the second roll gap deviation during the execution pressure change step. The first roll gap deviation is the roll gap deviation on both sides of the pinch roll, and the second roll gap deviation is the roll gap deviation when the pressure on one side of the pinch roll changes to the target pressure. The first satisfaction unit states that if the first roll gap deviation and the second roll gap deviation are less than or equal to the deviation threshold, then the accuracy of the pinch roll meets the requirements.

[0014] According to a third aspect of this application, a computer-readable storage medium is provided having a computer program stored thereon, the computer program including executable instructions that, when executed by a processor, implement the method described in any embodiment of the first aspect of this application.

[0015] According to a fourth aspect of this application, an electronic device is provided, comprising: one or more processors; and a memory for storing executable instructions of the processors, which, when executed by the one or more processors, cause the one or more processors to implement the method described in any embodiment of the first aspect of this application.

[0016] The beneficial effects of this application are as follows: Adjust the roll gap to the third distance, then adjust the pressure on both sides of the upper pinch roll. Based on the roll gap deviation during the pressure adjustment process, determine whether the accuracy of the pinch roll meets the standard, thereby quickly judging the accuracy status of the newly replaced pinch roll.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 A flowchart of a pinch roller accuracy testing method according to an embodiment of this application is shown; Figure 2 A block diagram of a pinch roller accuracy testing device according to an embodiment of this application is shown; Figure 3 A schematic diagram of a computer-readable storage medium in an embodiment of this application is shown; Figure 4 A schematic diagram of the system structure of an electronic device in an embodiment of this application is shown. Detailed Implementation

[0019] Figure 1 A flowchart of a pinch roller accuracy testing method according to an embodiment of this application is shown. See also: Figure 1 A method for testing the accuracy of a pinch roll is provided. The pinch roll includes an upper pinch roll and a lower pinch roll, with a roll gap formed between the upper pinch roll and the lower pinch roll. The method includes at least steps S1 to S4, as detailed below: In step S1, when the pinch roller is replaced, the roller gap is opened to a first distance, the position of the upper pinch roller is controlled, the roller gap is closed to a second distance, the pressure is zeroed, and then the roller gap is closed to a third distance.

[0020] In some embodiments, opening the roll gap to a first distance when changing the pinch roll includes: controlling the upper pinch roll to move away from the lower pinch roll until the roll gap is at the first distance; closing the roll gap to a second distance includes: controlling the upper pinch roll to move closer to the lower pinch roll until the roll gap is at the second distance; closing the roll gap to a third distance includes: controlling the upper pinch roll to move closer to the lower pinch roll until the roll gap is at the third distance.

[0021] It should be noted that during the change of the roll gap, the lower pinch roll remains unchanged, while the upper pinch roll moves relative to the lower pinch roll, thereby changing the size of the roll gap.

[0022] In step S2, the pressure of the upper pinch roller is controlled by performing a pressure change step: the pressure on both sides of the upper pinch roller is changed from a first pressure to a second pressure, and then changed from the second pressure back to the first pressure.

[0023] In step S3, the first roll gap deviation and the second roll gap deviation are obtained during the pressure change step. The first roll gap deviation is the roll gap deviation on both sides of the pinch roll, and the second roll gap deviation is the roll gap deviation when the pressure on one side of the pinch roll changes to the target pressure. The two sides of the upper pinch roll are the operating side and the transmission side, and one side of the pinch roll is either the operating side or the transmission side.

[0024] In step S4, if the first roll gap deviation and the second roll gap deviation are less than or equal to the deviation threshold, then the accuracy of the pinch roll meets the requirements.

[0025] In some embodiments, a hydraulic cylinder is provided on each side of the upper pinch roller. Each hydraulic cylinder is equipped with a magnetic scale and a pressure sensor. The pressure on one side of the upper pinch roller is detected by the pressure sensor, the stroke of the hydraulic cylinder is detected by the magnetic scale, and the roller gap is determined by the stroke of the hydraulic cylinder. The accuracy of the magnetic scale can be 2μm.

[0026] In some embodiments, the formula for calculating the pressure on one side of the upper pinch roller is as follows: , This refers to the pressure on the piston side of the hydraulic cylinder. This is the cross-sectional area of ​​the piston side of the hydraulic cylinder. This refers to the pressure on the rod side of the hydraulic cylinder. This is the cross-sectional area of ​​the rod side of the hydraulic cylinder.

[0027] In some embodiments, when controlling the position of the upper pinch roll, a position closed-loop effect is achieved by comparing the roll gap movement slope signal and a set value; similarly, when controlling the pressure of the upper pinch roll, a pressure closed-loop effect is achieved by comparing the pressure movement slope signal and a set value. The roll gap movement slope signal can be understood as the roll gap change rate, and the pressure movement slope can be understood as the pressure change rate.

[0028] For example, the roll gap movement slope is 2mm / s, the size of the roll gap before movement is 20mm, and the set value of the size after movement is 18mm. If the actual size is around 18mm, such as 18±0.05mm, the expected target is met. If the actual size is not around 18mm, the expected target is not met, and the roll gap movement slope needs to be adjusted. If the actual size is too large, the roll gap movement slope is increased; if the actual size is too small, the roll gap movement slope is decreased. And so on, the roll gap is judged every 1 second to achieve closed-loop control of the roll gap.

[0029] In some implementations, the deviation threshold is 1 mm.

[0030] In some embodiments, closing the roll gap to a second distance includes: acquiring a first speed; closing the roll gap to the second distance at the first speed; closing the roll gap to a third distance includes: acquiring a second speed; closing the roll gap to the third distance at the second speed.

[0031] In some embodiments, the first distance is 520mm, the second distance is 20mm, the third distance is 2mm, the first speed is 100mm / s, and the second speed is 1.5mm / s.

[0032] In some embodiments, the pressure zeroing step includes: zeroing the pressure on both sides of the upper pinch roller, obtaining the pressure fluctuation of the upper pinch roller; if the absolute value of the pressure fluctuation is greater than or equal to a pressure threshold, then returning to the step of zeroing the pressure on both sides of the upper pinch roller until the absolute value of the pressure fluctuation is less than the pressure threshold.

[0033] For example, the pressure threshold is 10KN. During the pressure zeroing process, if the pressure changes within the range of -10KN to 10KN, the pressure zeroing process is stopped. If the pressure changes outside the range of -10KN to 10KN, the pressure zeroing process is restarted.

[0034] In this way, the pressure of the pinch roller is zeroed to prevent it from affecting subsequent pressure control and to improve the accuracy of roller gap detection.

[0035] In some embodiments, changing the pressure on both sides of the upper pinch roller from a first pressure to a second pressure, and then from the second pressure back to the first pressure, includes: according to a target pressure change rate, sequentially increasing the pressure on both sides of the upper pinch roller from the first pressure to a third pressure, a fourth pressure, a fifth pressure, and the second pressure, and then sequentially decreasing the pressure from the second pressure to the fifth pressure, the fourth pressure, the third pressure, and the first pressure.

[0036] In some embodiments, the first pressure is 10 kN, the second pressure is 90 kN, the third pressure is 30 kN, the fourth pressure is 50 kN, the fifth pressure is 70 kN, and the target pressure change rate is 2-5 kN / s.

[0037] In some embodiments, after obtaining the first roll gap deviation and the second roll gap deviation during the execution pressure change step, the method further includes: if the first roll gap deviation or the second roll gap deviation is greater than the deviation threshold, then the accuracy of the pinch roll does not meet the requirements.

[0038] In this application, the roll gap is adjusted to the third distance, and then the pressure on both sides of the upper pinch roll is adjusted. Based on the roll gap deviation during the pressure adjustment process, it is determined whether the accuracy of the pinch roll meets the standard, thereby quickly judging the accuracy status of the newly replaced pinch roll. This innovatively applies to the accuracy detection of pinch rolls, realizing the rapid determination of real-time accuracy after roll replacement. It breaks through the traditional lagging mode that relies on post-event retrospective investigation. Combining the status of mechanical, hydraulic and automation systems, accuracy verification is performed immediately after roll replacement, potential problems are discovered and dealt with in advance, batch quality accidents are avoided, and production stability and maintenance efficiency are improved.

[0039] Figure 2A block diagram of a pinch roller accuracy testing device according to an embodiment of this application is shown. See also: Figure 2 According to a second aspect of this application, a device for testing the accuracy of a pinch roll is provided, the pinch roll including an upper pinch roll and a lower pinch roll, a roll gap being formed between the upper pinch roll and the lower pinch roll, the device comprising: The first change unit 101, when replacing the pinch roller, opens the roller gap to a first distance, controls the position of the upper pinch roller, closes the roller gap to a second distance, performs a pressure zeroing step, and then closes the roller gap to a third distance. The first execution unit 102 performs pressure control on the upper pinch roller and executes the pressure change step: changing the pressure on both sides of the upper pinch roller from the first pressure to the second pressure, and then changing the pressure from the second pressure back to the first pressure; The first acquisition unit 103 acquires the first roll gap deviation and the second roll gap deviation during the execution pressure change step. The first roll gap deviation is the roll gap deviation on both sides of the pinch roll, and the second roll gap deviation is the roll gap deviation when the pressure on one side of the pinch roll changes to the target pressure. If the first roll gap deviation and the second roll gap deviation are less than or equal to the deviation threshold, then the accuracy of the pinch roll meets the requirements.

[0040] Based on the same inventive concept, as a third aspect, this application also provides a computer-readable storage medium storing a computer program thereon, the computer program including executable instructions that, when executed by a processor, implement the method described in any embodiment of the first aspect of this application.

[0041] In some possible implementations, various aspects of this application may also be implemented as a program product comprising program code that, when the program product is run on a terminal device, causes the terminal device to perform the steps described in the "Exemplary Methods" section of this specification according to various exemplary embodiments of this application.

[0042] refer to Figure 3 As shown, a program product 200 for implementing the above-described method according to an embodiment of this application is described. It may employ a portable compact disc read-only memory (CD-ROM) and include program code, and can run on a terminal device, such as a personal computer. However, the program product of this application is not limited thereto. In this document, a readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0043] The program product may employ any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0044] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of sending, propagating, or transmitting programs for use by or in conjunction with an instruction execution system, apparatus, or device.

[0045] The program code contained on the readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0046] Program code for performing the operations of this application can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0047] In another respect, this application also provides an electronic device capable of implementing the above-described method.

[0048] Those skilled in the art will understand that various aspects of this application can be implemented as a system, method, or program product. Therefore, various aspects of this application can be specifically implemented in the following forms: a completely hardware implementation, a completely software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, collectively referred to herein as a "circuit," "module," or "system."

[0049] The following reference Figure 4 To describe an electronic device 300 according to this embodiment of the present application. Figure 4 The electronic device 300 shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0050] like Figure 4 As shown, the electronic device 300 is presented in the form of a general-purpose computing device. The components of the electronic device 300 may include, but are not limited to: at least one processing unit 310, at least one storage unit 320, and a bus 330 connecting different system components (including storage unit 320 and processing unit 310).

[0051] The storage unit stores program code that can be executed by the processing unit 310, causing the processing unit 310 to perform the steps described in the "Embodiment Methods" section above according to various exemplary embodiments of this application.

[0052] Storage unit 320 may include readable media in the form of volatile storage units, such as random access memory (RAM) 321 and / or cache memory 322, and may further include read-only memory (ROM) 323.

[0053] Storage unit 320 may also include a program / utility 324 having a set (at least one) of program modules 325, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0054] Bus 330 can represent one or more of several types of bus structures, including a memory cell bus or memory cell controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the various bus structures.

[0055] Electronic device 300 can also communicate with one or more external devices 400 (e.g., keyboard, pointing device, Bluetooth device, etc.), and with one or more devices that enable a user to interact with the electronic device 300, and / or with any device that enables the electronic device 300 to communicate with one or more other computing devices (e.g., router, modem, etc.). This communication can be performed via input / output (I / O) interface 350. Furthermore, electronic device 300 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 360. Figure 4 As shown, network adapter 360 communicates with other modules of electronic device 300 via bus 330. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with electronic device 300, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0056] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0057] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for testing the accuracy of a pinch roller, characterized in that, The pinch roller includes an upper pinch roller and a lower pinch roller, and a roller gap is formed between the upper pinch roller and the lower pinch roller. The method includes: When replacing the pinch roll, the roll gap is opened to a first distance, the position of the upper pinch roll is controlled, the roll gap is closed to a second distance, a pressure zeroing step is performed, and then the roll gap is closed to a third distance. The pressure of the upper pinch roller is controlled by performing a pressure change step: changing the pressure on both sides of the upper pinch roller from a first pressure to a second pressure, and then changing the pressure from the second pressure back to the first pressure; The first roll gap deviation and the second roll gap deviation are obtained during the execution pressure change step. The first roll gap deviation is the roll gap deviation on both sides of the pinch roll, and the second roll gap deviation is the roll gap deviation when the pressure on one side of the pinch roll changes to the target pressure. If the first roll gap deviation and the second roll gap deviation are less than or equal to the deviation threshold, then the accuracy of the pinch roll meets the requirements.

2. The method for testing the accuracy of a pinch roller according to claim 1, characterized in that, Closing the roll gap to the second distance includes: Gain the first speed; The roll gap is closed to the second distance at the first speed; Closing the roll gap to the third distance includes: Obtain the second speed; The roll gap is closed to the third distance at the second speed.

3. The method for testing the accuracy of a pinch roller according to claim 2, characterized in that, The first distance is 520mm, the second distance is 20mm, the third distance is 2mm, the first speed is 100mm / s, and the second speed is 1.5mm / s.

4. The method for testing the accuracy of a pinch roller according to claim 1, characterized in that, The step of clearing the execution pressure includes: The pressure on both sides of the upper pinch roller is zeroed, and the pressure fluctuation of the upper pinch roller is obtained; If the absolute value of the pressure fluctuation is greater than or equal to the pressure threshold, then return to the step of zeroing the pressure on both sides of the upper pinch roller until the absolute value of the pressure fluctuation is less than the pressure threshold.

5. The method for testing the accuracy of a pinch roller according to claim 1, characterized in that, The step of changing the pressure on both sides of the upper pinch roller from a first pressure to a second pressure, and then from the second pressure back to the first pressure, includes: According to the target pressure change rate, the pressure on both sides of the upper pinch roller is increased sequentially from the first pressure to the third pressure, the fourth pressure, the fifth pressure and the second pressure, and then decreased sequentially from the second pressure to the fifth pressure, the fourth pressure, the third pressure and the first pressure.

6. The method for testing the accuracy of a pinch roller according to claim 5, characterized in that, The first pressure is 10 kN, the second pressure is 90 kN, the third pressure is 30 kN, the fourth pressure is 50 kN, the fifth pressure is 70 kN, and the target pressure changes at a rate of 2-5 kN / s.

7. The method for testing the accuracy of a pinch roller according to claim 1, characterized in that, After obtaining the first roll gap deviation and the second roll gap deviation during the execution pressure change step, the method further includes: If the first roll gap deviation or the second roll gap deviation is greater than the deviation threshold, then the accuracy of the pinch roll does not meet the requirements.

8. A device for testing the accuracy of a pinch roller, characterized in that, The pinch rollers include an upper pinch roller and a lower pinch roller, with a roller gap formed between the upper pinch roller and the lower pinch roller. The device includes: The first change unit, when replacing the pinch roller, opens the roller gap to a first distance, controls the position of the upper pinch roller, closes the roller gap to a second distance, performs a pressure zeroing step, and then closes the roller gap to a third distance. The first execution unit performs pressure control on the upper pinch roller and executes the pressure change step: changing the pressure on both sides of the upper pinch roller from the first pressure to the second pressure, and then changing the pressure from the second pressure back to the first pressure; The first acquisition unit acquires the first roll gap deviation and the second roll gap deviation during the execution pressure change step. The first roll gap deviation is the roll gap deviation on both sides of the pinch roll, and the second roll gap deviation is the roll gap deviation when the pressure on one side of the pinch roll changes to the target pressure. The first satisfaction unit states that if the first roll gap deviation and the second roll gap deviation are less than or equal to the deviation threshold, then the accuracy of the pinch roll meets the requirements.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The computer program includes executable instructions that, when executed by a processor, implement the method of any one of claims 1-7.

10. An electronic device, characterized in that, include: One or more processors; A memory for storing executable instructions of the processor, which, when executed by the one or more processors, cause the one or more processors to perform the method according to any one of claims 1-7.

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