Strip steel deviation rectification control method, device and equipment of rolling mill

Abstract

The invention discloses a strip steel deviation rectification control method, device and equipment for a rolling mill. The method comprises the steps that first relative position information of a reference point arranged on the rolling mill and strip steel is obtained; based on the first relative position information and preset second relative position information, the first center line offset of the strip steel center line of the strip steel and the center line of a rack of the rolling mill is determined, and the second relative position information is relative position information of the reference point and the rack of the rolling mill; and based on the first center line offset, deviation correction is conducted on the strip steel. The technical problem that the qualified rate of finished strip steel is low is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of rolling, and in particular relates to a strip steel deviation correction control method, device and equipment for a rolling mill. Background Art

[0002] As competition in the steel market intensifies, cold rolling mills are transitioning to higher-end production. This increases the complexity of product manufacturing and, at the same time, demands for higher quality. In this context, inability to accurately control the rolling process can lead to low yield rates for finished strip, increasing costs and reducing competitiveness. Therefore, low yield rates for finished strip are a pressing technical issue that needs to be addressed. Summary of the Invention

[0003] The embodiments of the present invention provide a strip steel deviation correction control method, device and equipment for a rolling mill, which solve the technical problem of low qualified rate of finished strip steel.

[0004] In a first aspect, an embodiment of the present invention provides a strip deviation correction control method for a rolling mill, comprising: obtaining first relative position information between a reference point set on the rolling mill and the strip; determining a first centerline offset between a strip centerline of the strip and a centerline of a frame of the rolling mill based on the first relative position information and a preset second relative position information, wherein the second relative position information is the relative position information between the reference point and the frame of the rolling mill; and correcting the strip based on the first centerline offset.

[0005] In combination with the first aspect of the present invention, in some embodiments, the reference point is located on the guide plate on the exit side of the frame; obtaining the first relative position information of the reference point set on the rolling mill and the strip includes: obtaining the first distance between the reference point and the strip, and the first relative position information includes the first distance.

[0006] In combination with the first aspect of the present invention, in some embodiments, an infrared rangefinder is provided at the reference point; and obtaining the first distance between the reference point and the strip comprises: obtaining the first distance between the reference point and the strip through the infrared rangefinder.

[0007] In combination with the first aspect of the present invention, in some embodiments, determining the first centerline offset between the strip centerline and the frame centerline of the rolling mill based on the first relative position information and the preset second relative position information includes: obtaining the width of the strip; determining the first centerline offset based on the first distance, the second distance and the width of the strip, the second relative position information including the second distance, and the second distance being the distance between the reference point and the frame centerline.

[0008] In combination with the first aspect of the present invention, in some embodiments, the first centerline offset is determined based on the first distance, the second distance and the width of the strip, including: taking the difference between the second distance and the first distance as the first value; taking half of the width of the strip as the second value; and taking the difference between the second value and the first value as the first centerline offset.

[0009] In combination with the first aspect of the present invention, in some embodiments, the rack includes a plurality of racks, and the reference point is provided on the guide plate on the outlet side of each of the plurality of racks, and the first centerline offset includes a plurality of; the strip steel is corrected based on the first centerline offset, including: determining the second centerline offset between the strip centerline of the strip and the rack centerline of the plurality of racks based on the plurality of first centerline offsets; and correcting the strip steel based on the second centerline offset.

[0010] In combination with the first aspect of the present invention, in some embodiments, determining the second centerline offset between the strip centerline of the strip and the rack centerline of the multiple racks based on the multiple first centerline offsets includes: removing outliers from the multiple first centerline offsets to obtain multiple third centerline offsets; and taking the average value of the multiple third centerline offsets as the second centerline offset.

[0011] In combination with the first aspect of the present invention, in some embodiments, before obtaining multiple third centerline offsets, it also includes: for each first centerline offset in the multiple first centerline offsets, if the first centerline offset is within a preset offset range, determining that the first centerline offset is an abnormal value.

[0012] In the second aspect, an embodiment of the present invention provides a strip correction control device for a rolling mill, comprising: an information acquisition unit for acquiring first relative position information between a reference point set on the rolling mill and the strip; an offset determination unit for determining a first centerline offset between a strip centerline of the strip and a centerline of a frame of the rolling mill based on the first relative position information and a preset second relative position information, wherein the second relative position information is the relative position information between the reference point and the frame of the rolling mill; and a correction unit for correcting the strip based on the first centerline offset.

[0013] In a third aspect, an embodiment of the present invention provides an electronic device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any one of the methods described in the first aspect when executing the computer program.

[0014] The one or more technical solutions provided by the embodiments of the present invention achieve at least the following technical effects or advantages:

[0015] The embodiment of the present invention obtains first relative position information between a reference point set on the rolling mill and the steel strip; based on the first relative position information and preset second relative position information, determines a first centerline offset between the centerline of the steel strip and the centerline of the rolling mill frame, where the second relative position information is the relative position information between the reference point and the rolling mill frame; and corrects the steel strip based on the first centerline offset. After correcting the steel strip, the centerline offset between the centerline of the steel strip and the centerline of the frame can be reduced, so that the centerline of the steel strip and the centerline of the frame are as consistent as possible, thereby making the force on the steel strip uniform, improving rolling stability, and achieving accurate control of the rolling process of the rolling mill. Therefore, the qualified rate of the finished steel strip is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 Flowchart of a strip deviation correction control method for a rolling mill according to an embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of the position of the guide plate in an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of calculating various values ​​of the first centerline offset in an embodiment of the present invention;

[0020] Figure 4 is a schematic diagram of multiple racks in an embodiment of the present invention;

[0021] Figure 5 Schematic diagram of the tensiometer roller and the strip steel in an embodiment of the present invention;

[0022] Figure 6 This is a functional module diagram of a strip deviation correction control device for a rolling mill according to an embodiment of the present invention;

[0023] Figure 7 Schematic diagram of the structure of an electronic device in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] In the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions of various embodiments may be combined with each other, but this must be based on the fact that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0026] The embodiment of the present invention provides a strip deviation correction control method for a rolling mill, referring to Figure 1 As shown, the method includes the following steps S101 to S103:

[0027] S101: Acquire first relative position information between a reference point set on the rolling mill and the strip.

[0028] In some embodiments, the reference point may be located on a guide plate on the exit side of the frame; obtaining first relative position information between the reference point set on the rolling mill and the strip may include: obtaining a first distance between the reference point and the strip, and the first relative position information includes the first distance.

[0029] refer to Figure 2 As shown, Figure 2 This is a schematic diagram of the position of the guide plate in an embodiment of the present invention. The guide plate can be located at the outlet end of the lower working roll of the rolling mill. At the same time, it can also be located below the rolling line. The guide plate can be installed between the arch columns of the rolling mill. The guide plate is mainly used to guide the head of the strip to smoothly pass through the tensiometer roller of the rolling mill when threading the strip.

[0030] In some embodiments, an infrared rangefinder is provided at the reference point; and obtaining the first distance between the reference point and the steel strip may include: obtaining the first distance between the reference point and the steel strip by using the infrared rangefinder.

[0031] S102: Determine a first centerline offset between a strip centerline and a rolling mill stand centerline based on first relative position information and preset second relative position information, wherein the second relative position information is relative position information between a reference point and the rolling mill stand.

[0032] In some embodiments, determining a first centerline offset between a strip centerline of the strip and a centerline of a rolling mill frame based on first relative position information and preset second relative position information may include: obtaining the width of the strip; determining the first centerline offset based on the first distance, the second distance, and the width of the strip, the second relative position information including the second distance, which is the distance between the reference point and the centerline of the frame.

[0033] In some embodiments, determining the first centerline offset based on the first distance, the second distance, and the width of the strip may include: taking the difference between the second distance and the first distance as the first value; taking half the width of the strip as the second value; and taking the difference between the second value and the first value as the first centerline offset.

[0034] refer to Figure 3 As shown, Figure 3 Schematic diagram of calculating various values ​​of the first centerline offset in an embodiment of the present invention, wherein A1 is the second distance, L1 is the first distance, and C is the second value.

[0035] S103: Correcting the strip based on the first centerline offset.

[0036] In some embodiments, the plurality of racks are provided, a reference point is provided on a guide plate on an outlet side of each of the plurality of racks, and the first centerline offset comprises a plurality of values. Correcting the strip based on the first centerline offset may include the following steps S1031 to S1032:

[0037] S1031: Based on the multiple first centerline offsets, determine the second centerline offsets between the strip centerline of the steel strip and the rack centerlines of the multiple racks.

[0038] refer to Figure 4 As shown, Figure 4 This is a schematic diagram of multiple racks in an embodiment of the present invention, wherein the multiple racks include an F1 rack, an F2 rack, an F3 rack, an F4 rack, and an F5 rack, the multiple second distances are A1, A2, A3, A4, and A5, and the multiple first distances are L1, L2, L3, L4, and L5.

[0039] It should be noted that the first centerline offset can include one or more, that is, the selection of reference points can be one or more. In the case of one, the amount of calculation can be reduced and the efficiency of function implementation can be improved, but there are also inaccuracies. Therefore, it is possible to set reference points on the guide plate on the outlet side of each rack in multiple racks, determine a first centerline offset based on each reference point, and obtain multiple first centerline offsets. Then, based on the multiple first centerline offsets, the second centerline offset ultimately used for correction is obtained. This can reduce the impact of abnormal data on the correction process, or even eliminate the impact of abnormal data on the correction process, thereby improving the accuracy of strip correction.

[0040] In some embodiments, step S1031 may include: taking an average of a plurality of first centerline offsets as the second centerline offset.

[0041] In other embodiments, step S1031 may include: removing abnormal values ​​from the plurality of first centerline offsets to obtain a plurality of third centerline offsets; and taking an average value of the plurality of third centerline offsets as the second centerline offset.

[0042] In some embodiments, before obtaining multiple third centerline offsets, the method may further include: for each first centerline offset among multiple first centerline offsets, if the first centerline offset is within a preset offset range, determining that the first centerline offset is an abnormal value.

[0043] It should be noted that due to the ups and downs of the steel strip, the infrared rangefinder may be unable to accurately detect the first distance between the reference point and the strip. For example, if the first distance is too large, the first centerline offset calculated based on the first distance will fall within the preset offset range. Therefore, to avoid errors in the calculation of the centerline offset due to errors in the first distance detection, it is necessary to remove outliers from the multiple first centerline offsets. This ensures data accuracy, thereby improving the accuracy of the calculated centerline offset and ultimately the accuracy of the strip correction.

[0044] S1032: Based on the second center line offset, the strip is corrected.

[0045] In some embodiments, the strip is corrected based on the second center line offset, which can be: based on the second center line offset, the correction device of the rolling mill is controlled to correct the strip so that the center line offset between the strip center line and the center line of the rolling mill frame is less than a preset offset threshold.

[0046] It should be noted that with the intensification of competition in the steel market, cold rolling mills have begun to transform towards high-end production, and the difficulty of product manufacturing has been continuously upgraded. At the same time, the requirements for product quality have also been gradually improved. Under this situation, higher requirements are also placed on the accuracy of the rolling mill. The rolling stability and finished product quality of the continuous rolled plate and strip are closely related to the rolling center line of the unit. When the transverse center line of the strip is not offset from the center line of the rolling mill, it can be compensated by adjusting the shifting rolls and bending rolls. When the deviation exceeds a certain range, it cannot be compensated by adjusting the process parameters, which will affect the product quality and may even cause strip breakage in severe cases. The continuous rolling mill can ensure the centering of the strip during rolling by using a high-precision correction device located at the entrance of the rolling mill. However, as the equipment wears and ages, the center line of the strip and the center line of the frame will offset, and it is not easy to detect after the offset. Reference Figure 5 As shown, Figure 5 Schematic diagram of the tensiometer roller and the strip in the embodiment of the present invention. The offset between the center line of the frame and the center line of the strip can also be measured by taking the tensiometer roller between the frames as the reference point and measuring the distance between the two sides of the strip and the two side edges of the corresponding tensiometer roller. The difference between the two side distances is the center line offset between the center line of the strip and the center line of the frame by default. For example, Figure 5 In the measurement, the center line offset between the center line of the strip and the center line of the frame is (MN) ÷ 2. However, the tension meter rollers between the frames are replaced once a year, and the positions of the ends of the rollers on both sides will be offset to varying degrees after replacement. Moreover, after precise measurement, the center line of the tension meter roller is not completely coincident with the center line of the frame. In other words, using the tension meter roller as a reference object is inherently error-prone, which will lead to inaccurate calculation of the offset of the center line of the strip. When measuring the distance of the transmission side of the strip, the operator is required to cross the strip from the operating side of the strip to the transmission side of the strip, which increases the risk factor of the operation and brings inconvenience to the measurement operation. In contrast, the embodiment of the present invention can solve the above problems. The embodiment of the present invention can simply and accurately calculate the offset value of the center line of the frame and the center line of the strip, and quickly adjust it to keep the center line of the strip and the center line of the frame as consistent as possible, thereby improving the rolling stability and the quality of the strip.

[0047] It should be noted that during the maintenance intervals of the continuous rolling mill, a professional measurement team can be hired to accurately measure the position of the center line of each frame; on the exit side of each frame, a reference point is made on the guide plate along the center line of the frame extending a certain distance toward the operating side to ensure that it is outside the strip area; the distance between the reference point and the center line of the frame is accurately measured as a fixed reference value A; when subsequently calculating the offset of the rolling center line, it is only necessary to measure the distance between the operating side edge of the strip and the reference point to calculate the offset between the center line of the strip and the center line of the frame. The offset between the center line of the strip and the center line of the frame of multiple frames can be combined, and the average value can be taken as the offset value of the entire rolling mill. If the absolute value of the offset is ≥3-5mm, the compensation value of the correction device at the entrance of the rolling mill can be adjusted to compensate for the centering effect of the correction device.

[0048] The embodiment of the present invention obtains first relative position information between a reference point set on the rolling mill and the steel strip; based on the first relative position information and preset second relative position information, determines a first centerline offset between the centerline of the steel strip and the centerline of the rolling mill frame, where the second relative position information is the relative position information between the reference point and the rolling mill frame; and corrects the steel strip based on the first centerline offset. After correcting the steel strip, the centerline offset between the centerline of the steel strip and the centerline of the frame can be reduced, so that the centerline of the steel strip and the centerline of the frame are as consistent as possible, thereby making the force on the steel strip uniform, improving rolling stability, and achieving accurate control of the rolling process of the rolling mill. Therefore, the qualified rate of the finished steel strip is improved.

[0049] Based on the same invention concept, Figure 6 As shown, an embodiment of the present invention provides a strip deviation correction control device 10 for a rolling mill, comprising: an information acquisition unit 110, for acquiring first relative position information between a reference point set on the rolling mill and the strip; an offset determination unit 120, for determining a first centerline offset between a strip centerline of the strip and a centerline of a frame of the rolling mill based on the first relative position information and preset second relative position information, wherein the second relative position information is the relative position information between the reference point and the frame of the rolling mill; and a deviation correction unit 130, for correcting the strip based on the first centerline offset.

[0050] It is understood that the reference point is located on the guide plate at the exit side of the rack; the information acquisition unit 110 is specifically configured to acquire a first distance between the reference point and the steel strip, wherein the first relative position information includes the first distance. An infrared rangefinder is provided at the reference point; acquiring the first distance between the reference point and the steel strip includes obtaining the first distance between the reference point and the steel strip using the infrared rangefinder.

[0051] It can be understood that the offset determination unit 120 includes: a width acquisition subunit, used to obtain the width of the strip; a first determination subunit, used to determine the first center line offset based on the first distance, the second distance and the width of the strip, and the second relative position information includes the second distance, which is the distance between the reference point and the center line of the frame.

[0052] It can be understood that the first determining subunit is specifically used to: take the difference between the second distance and the first distance as the first value; take half the width of the strip as the second value; and take the difference between the second value and the first value as the first centerline offset.

[0053] It can be understood that there are multiple racks, and a reference point is set on the guide plate on the outlet side of each rack in the multiple racks, and the first center line offset includes multiple; the correction unit 130 includes: a second determination subunit, which is used to determine the second center line offset of the strip center line and the rack center line of the multiple racks based on the multiple first center line offsets; a correction subunit, which is used to correct the strip based on the second center line offset.

[0054] It is understood that the second determination subunit is specifically configured to: remove outliers from the plurality of first centerline offsets to obtain a plurality of third centerline offsets; and average the plurality of third centerline offsets as the second centerline offset. Prior to obtaining the plurality of third centerline offsets, the method further includes: determining, for each first centerline offset in the plurality of first centerline offsets, if the first centerline offset is within a preset offset range, that the first centerline offset is an outlier.

[0055] It should be understood that more implementation details of the strip deviation correction control device 10 of the rolling mill in the embodiment of the present invention can be found in the aforementioned strip deviation correction control method of the rolling mill. For the sake of brevity of the specification, they will not be repeated here.

[0056] Based on the same inventive concept, an embodiment of the present invention further provides an electronic device, such as Figure 7 As shown, it includes a memory 704, a processor 702 and a computer program stored in the memory 704 and capable of running on the processor 702. The processor 702 executes the program to implement the steps described in any embodiment of the strip deviation correction control method of the rolling mill.

[0057] Among them, Figure 7In the embodiment of the present invention, a bus architecture (represented by bus 700) is shown. Bus 700 may include any number of interconnected buses and bridges, and bus 700 links various circuits including one or more processors represented by processor 702 and memory represented by memory 704. Bus 700 may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 705 provides an interface between bus 700 and receiver 701 and transmitter 703. Receiver 701 and transmitter 703 may be the same component, namely a transceiver, which provides a unit for communicating with various other devices over a transmission medium. Processor 702 is responsible for managing bus 700 and general processing, while memory 704 may be used to store data used by processor 702 when performing operations.

[0058] 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 implementations are within the scope and spirit of the present invention 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, hardwiring, or a combination of any of these. Furthermore, each functional unit may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0059] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0060] The units described as separate components may or may not be physically separate, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0061] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc. Various media that can store program codes.

[0062] The foregoing description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A strip deviation correction control method for a rolling mill, characterized in that: include: Acquiring first relative position information between a reference point set on the rolling mill and the strip; Determining a first centerline offset between a strip centerline of the steel strip and a centerline of a stand of the rolling mill based on the first relative position information and preset second relative position information, wherein the second relative position information is relative position information between the reference point and the stand of the rolling mill; Based on the first centerline offset, the strip is corrected.

2. The strip deviation correction control method of a rolling mill according to claim 1, characterized in that: The reference point is located on the guide plate on the exit side of the frame; and obtaining first relative position information between the reference point set on the rolling mill and the strip steel includes: A first distance between the reference point and the steel strip is acquired, where the first relative position information includes the first distance.

3. The strip deviation correction control method of a rolling mill according to claim 2, characterized in that: An infrared rangefinder is provided at the reference point; and obtaining a first distance between the reference point and the strip steel comprises: The first distance between the reference point and the steel strip is obtained by the infrared rangefinder.

4. The strip deviation correction control method of a rolling mill according to claim 2, characterized in that: The determining, based on the first relative position information and the preset second relative position information, a first centerline offset between a strip centerline of the steel strip and a centerline of a stand of the rolling mill, comprises: Obtaining the width of the steel strip; The first centerline offset is determined based on the first distance, the second distance and the width of the strip, and the second relative position information includes the second distance, which is the distance between the reference point and the centerline of the frame.

5. The strip deviation correction control method of a rolling mill according to claim 4, characterized in that: The determining the first centerline offset based on the first distance, the second distance, and the width of the steel strip includes: subtracting the first distance from the second distance as the first value; Taking half of the width of the steel strip as the second value; The difference between the second value and the first value is used as the first centerline offset.

6. The strip deviation correction control method of a rolling mill according to claim 2, characterized in that: The racks include a plurality of racks, and the guide plate on the outlet side of each of the plurality of racks is provided with the reference point. The first centerline offset includes a plurality of first centerline offsets. The strip steel is corrected based on the first centerline offsets, including: Determining a second centerline offset between a strip centerline of the steel strip and a plurality of rack centerlines of the racks based on the plurality of first centerline offsets; Based on the second centerline offset, the strip is corrected.

7. The strip deviation correction control method of a rolling mill according to claim 6, characterized in that: The determining, based on the plurality of first centerline offsets, a second centerline offset between a strip centerline of the steel strip and a plurality of rack centerlines of the racks comprises: removing abnormal values ​​from the plurality of first centerline offsets to obtain a plurality of third centerline offsets; An average value of the plurality of third centerline offsets is used as the second centerline offset.

8. The strip deviation correction control method of a rolling mill according to claim 7, characterized in that: Before obtaining the plurality of third centerline offsets, the method further includes: For each first centerline offset among the plurality of first centerline offsets, if the first centerline offset is within a preset offset range, the first centerline offset is determined to be an abnormal value.

9. A strip deviation correction control device for a rolling mill, characterized in that: include: an information acquisition unit, configured to acquire first relative position information between a reference point provided on the rolling mill and the steel strip; an offset determining unit, configured to determine a first centerline offset between a strip centerline of the steel strip and a centerline of a stand of the rolling mill based on the first relative position information and preset second relative position information, wherein the second relative position information is relative position information between the reference point and the stand of the rolling mill; A deviation correction unit is used to correct the strip steel based on the first center line offset.

10. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 8 when executing the computer program.

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