Laser shock strengthening method, system, medium and equipment for large hole inner wall based on dynamic control of beam polarization

Abstract

The present invention relates to a method, system, medium and equipment for laser shock strengthening of the inner wall of a large hole based on dynamic regulation of light beam polarization. The method extracts the surface features of a target area in a component and obtains the normal of the target area according to the surface features. When laser shock strengthening is performed on the target area, the polarization direction of the laser beam is adjusted according to the normal of the target area, so that the normal direction is always the same as or opposite to the polarization direction of the laser beam. Therefore, no matter which part of the surface of the component is subjected to laser shock strengthening, the laser polarization state can be kept unchanged, thereby ensuring that the strengthening effect of each part of the component is consistent.

Description

Technical Field

[0001] The present invention belongs to the technical field of laser shock strengthening, and in particular relates to a method, system, medium and equipment for laser shock strengthening the inner wall of a large hole based on dynamic regulation of light beam polarization. Background Art

[0002] Laser shock processing (LSP) is a process that uses high power density (>GW / cm 2 ) nanosecond pulses irradiate the surface of the material, and the absorption protective layer coated on the surface of the material absorbs the laser energy and undergoes explosive gasification and evaporation, forming a high-temperature (>10000℃) plasma. The plasma continues to absorb the laser energy and expands rapidly, forming a high-pressure (>GPa) shock wave that propagates into the interior of the material under the constraint of the water flow. Under the action of the high-pressure shock wave, the material undergoes severe plastic deformation, forming residual stress and changing the microstructure, thereby improving the fatigue performance, wear and stress corrosion performance of the material.

[0003] When performing laser shock strengthening on a curved surface, it is necessary to use oblique incidence to carry out the processing. When the laser irradiates different parts of the curved surface, the polarization state will change, resulting in inconsistent strengthening effects. Summary of the invention

[0004] The present invention provides a method, system, medium and equipment for laser shock strengthening of the inner wall of a large hole based on dynamic regulation of beam polarization, so as to solve the problems of laser polarization state change and inconsistent strengthening effect generated when laser shock strengthening is performed on a curved surface in the prior art.

[0005] A laser shock peening method for the inner wall of a large hole based on dynamic control of beam polarization is used to perform laser shock peening on a target area on the surface of a component through a laser beam, comprising the steps of:

[0006] Acquiring surface features of the target area;

[0007] Calculating the surface features of the target area to obtain a normal line of the center position of the target area;

[0008] Adjusting the polarization direction of the laser beam according to the direction of the normal line so that the direction of the normal line is the same as or opposite to the polarization direction of the laser beam;

[0009] The target area is laser-shock-peened according to the laser beam with the polarization direction adjusted.

[0010] Optionally, obtaining the surface features of the target area includes:

[0011] Acquiring geometric features of the component, establishing a component model according to the geometric features of the component, and establishing a laser beam model according to predefined data;

[0012] According to the laser beam model and the component model, simulate the laser beam irradiating the component at a preset incident angle, and obtain a projection area of ​​the laser beam projected onto the surface of the component according to the simulation result;

[0013] The features of the projection area are used as the surface features of the target area.

[0014] Optionally, the component includes a plurality of target areas, and after laser shock peening is performed on the target areas according to the laser beam after adjusting the polarization direction, the method further includes:

[0015] Select the next target area according to the preset order;

[0016] re-adjusting the polarization direction of the laser beam according to the direction of the normal line of the next target area;

[0017] The next target area is laser-shock-peened according to the laser beam after the polarization direction is adjusted again, until the laser-shock-peening of all target areas is completed.

[0018] Optionally, the next target area is selected according to a preset sequence, including:

[0019] Connecting the plurality of target areas in a preset order to generate a processing path;

[0020] The next target area is selected according to the position of the target area in the processing path.

[0021] Optionally, before adjusting the polarization direction of the laser beam according to the direction of the normal line, the method further includes:

[0022] generating an initial laser beam by a preset exciter;

[0023] The initial laser beam is shaped by a preset shaping lens group to generate a parallel laser beam.

[0024] Optionally, performing laser shock peening on the target area according to the laser beam after adjusting the polarization direction includes:

[0025] Setting a spot size according to the surface features of the target area, and focusing the laser beam after adjusting the polarization direction according to the spot size, so that the spot formed by the laser beam in the target area coincides with the target area;

[0026] The target area is laser-shock-peened by a focused laser beam.

[0027] The present invention also provides a large-hole inner wall laser shock peening system based on dynamic control of beam polarization, which is used for laser shock peening of a target area of ​​a component, comprising:

[0028] An acquisition module, used for acquiring the surface features of the target area;

[0029] A calculation module, used for calculating the surface features of the target area to obtain a normal line of the center position of the target area;

[0030] an adjustment module, configured to adjust the polarization direction of the laser beam according to the direction of the normal line, so that the direction of the normal line is the same as or opposite to the polarization direction of the laser beam;

[0031] The shock peening module is used to perform laser shock peening on the target area according to the laser beam after adjusting the polarization direction.

[0032] Optionally, the adjustment module includes:

[0033] A control unit, configured to generate a rotation signal according to the direction of the normal line;

[0034] a motor, configured to rotate according to the rotation signal;

[0035] The half wave plate is connected to the output shaft of the motor through a preset transmission component, and is used to rotate along with the output shaft of the motor to adjust the polarization direction of the laser beam.

[0036] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements any of the above methods when executed by a processor.

[0037] The present invention also provides an electronic terminal, comprising: a processor and a memory;

[0038] The memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the terminal executes any one of the methods described above.

[0039] The present invention provides a method, system, medium and equipment for laser shock strengthening of the inner wall of a large hole based on dynamic regulation of beam polarization, which has the following beneficial effects: by extracting the surface features of a target area in a component, and obtaining the normal of the target area according to the surface features; when performing laser shock strengthening on the target area, adjusting the polarization direction of the laser beam according to the normal of the target area, so that the normal direction is always the same as or opposite to the polarization direction of the laser beam, so that no matter which part of the surface of the component is subjected to shock strengthening by the laser beam, the laser polarization state can be kept unchanged, thereby ensuring that the strengthening effect of each part of the component is consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic diagram of an exemplary oblique entry processing of the present invention;

[0041] Figure 2 is a graph showing exemplary laser energy loss rates due to different laser polarization states according to the present invention;

[0042] Figure 3 is a flow chart of a laser shock peening method in one embodiment of the present invention;

[0043] Figure 4 is a flowchart of a specific implementation in one embodiment of the present invention;

[0044] Figure 5 is a schematic structural diagram of a laser shock peening system in one embodiment of the present invention;

[0045] The reference numerals are as follows:

[0046] 1 Polarized laser beam;

[0047] 2 beam shaping lens set;

[0048] 3. Laser beam;

[0049] 4 Half wave plate;

[0050] 5 Second transmission wheel;

[0051] 6. Laser beam after polarization direction adjustment;

[0052] 7 Focusing lens group;

[0053] 8. Parts;

[0054] 9 first transmission wheel;

[0055] 10. Motor;

[0056] 11 control bus;

[0057] 12 Control unit. DETAILED DESCRIPTION

[0058] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0059] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0060] In the following description, numerous details are discussed to provide a more thorough explanation of embodiments of the present invention; however, it is apparent to one skilled in the art that embodiments of the present invention may be practiced without these specific details.

[0061] The inventors found that when laser shock peening is performed on the inner wall of a large hole by laser shock peening technology, it is necessary to use oblique incidence to carry out the processing. When the laser irradiates different parts of the hole, the polarization state will change, such as Figure 1 As shown in the figure, assuming that the vibration direction of the light beam is vertical, when processing the lower side of the inner wall of a large hole, the vibration direction of the light beam is in the incident plane, and the processing is strengthened in the horizontal polarization state (P light); if the polarization direction remains unchanged, when processing the right side of the inner wall of a large hole, the vibration direction of the light beam is perpendicular to the incident plane, and the processing is strengthened in the vertical polarization state (S light). Since a water confinement layer needs to be loaded during laser shock strengthening, the laser energy reflected and lost on the surface of the water confinement layer during oblique incident shock has different loss rates due to different laser polarization states (such as Figure 2 Therefore, polarization state adjustment is an important factor affecting the strengthening effect, and the real-time adjustment method during the strengthening process is an essential function of laser shock strengthening equipment.

[0062] At present, in order to solve the problem of uneven strengthening effect caused by the change of laser polarization state during oblique incident laser shock strengthening, the reflectivity change caused by the change of polarization state is generally calculated, and then the input energy is changed to ensure the consistency of energy acting on the metal surface, so as to achieve consistency of strengthening effect. This method requires a large amount of redundant laser energy in the equipment. When laser shock strengthening is performed on large parts, in order to improve processing efficiency, a large energy and large spot method is generally used. The redundant laser energy of the equipment is small, making it difficult to achieve effective compensation.

[0063] In order to solve the above defects, Figure 3 As shown, the present invention provides a laser shock strengthening method for the inner wall of a large hole based on dynamic control of beam polarization, which is used to perform laser shock strengthening on a target area on the surface of a component by a laser beam, and multiple target areas are arranged on the surface of the component in advance, and the laser beam performs shock strengthening on the surface of the component according to the position of the target area; the method comprises the steps of:

[0064] S310. Acquire surface features of the target area;

[0065] In this embodiment, taking the impact strengthening of the hole wall of a large circular hole as an example, the target area is the corresponding area when the laser beam is irradiated, and the surface feature is the cylindrical surface feature of the corresponding area;

[0066] S320. Calculate the surface features of the target area to obtain the normal of the center position of the target area;

[0067] A normal line is an imaginary line that is always perpendicular to a plane. The normal line of a curve is a straight line perpendicular to the tangent line of a point on the curve. The normal line of a point on a surface is a straight line (i.e., a vector) that passes through this point and is perpendicular to the tangent plane of this point. The normal line of the target area is obtained by calculating the cylindrical surface features, and the normal line is used to describe the features of the target area.

[0068] S330. Adjusting the polarization direction of the laser beam according to the direction of the normal line so that the direction of the normal line is the same as or opposite to the polarization direction of the laser beam;

[0069] Polarization direction, that is, the direction when the vibration direction is inconsistent with the propagation direction. Only transverse waves have polarization phenomenon, and the vibration direction is perpendicular to the propagation direction; the polarization direction of the laser beam can be adjusted by a half-wave plate; in this embodiment, the laser beam is adjusted to always be in the same direction or opposite direction as the normal of the target area, so that the laser beam always maintains a horizontal polarization state;

[0070] S340. Perform laser shock peening on the target area according to the laser beam after adjusting the polarization direction.

[0071] In this embodiment, taking the impact strengthening of the hole wall of a large circular hole as an example, the laser beam is always kept in a horizontal polarization state to ensure that the laser beam is always irradiated on the inner wall of the large hole in a horizontal polarization state, thereby reducing the reflectivity of the obliquely incident laser beam and ensuring the strengthening effect.

[0072] In some embodiments, obtaining the surface characteristics of the target area includes:

[0073] S410. Acquire geometric features of components, establish component models according to the geometric features of components, and establish laser beam models according to predefined data;

[0074] S420. Simulate the laser beam according to the laser beam model and the component model to irradiate the component at a preset incident angle, and obtain the projection area of ​​the laser beam onto the surface of the component according to the simulation result;

[0075] S430. Using the features of the projection area as the surface features of the target area;

[0076] The geometric features of the components in this embodiment are mainly the surface features of the inner wall of the circular hole. A component model containing the same circular hole is established based on the surface features of the inner wall of the circular hole. The predefined information of the laser beam model includes the laser beam cross-sectional data, the incident angle and the light source position. Since the laser beam is incident at an angle, the projection area is a partial surface corresponding to the ellipse. Correspondingly, the surface features of the target area are also partial surfaces corresponding to the ellipse.

[0077] In some embodiments, the component includes a plurality of target areas, and after laser shock peening the target areas according to the laser beam with the polarization direction adjusted, the following steps are further included:

[0078] S510. Select the next target area according to the preset order;

[0079] S520. Re-adjusting the polarization direction of the laser beam according to the direction of the normal line of the next target area;

[0080] S530. Perform laser shock peening on the next target area according to the laser beam after adjusting the polarization direction again, until the laser shock peening of all target areas is completed.

[0081] In this embodiment, the polarization direction of the laser beam is adjusted again according to the direction of the normal of the next target area, so that the normal direction of the target area is always the same as or opposite to the polarization direction of the laser beam, so that the laser beam maintains a horizontal polarization state; taking the inner wall of a large hole as an example, since it is necessary to adopt an oblique incidence method for processing, it is necessary to simulate the shapes of multiple target areas through component models and laser beam models, and pre-uniformly arrange the multiple target areas on the inner wall of the hole; therefore, it is necessary to sort the multiple target areas in advance, and perform laser shock strengthening on the multiple target areas in sequence; the surface of the component is strengthened by a laser beam that always maintains a horizontal polarization state, so as to maintain the consistency of the degree of strengthening of the component surface.

[0082] In some embodiments, selecting the next target area according to a preset sequence includes:

[0083] S610. Connect multiple target areas in a preset order to generate a processing path;

[0084] S620. Select the next target area according to the position of the target area in the processing path.

[0085] The laser beam is moved along the processing path to achieve laser shock strengthening of multiple target areas. The general processing path is serpentine or Z-shaped.

[0086] In some embodiments, before adjusting the polarization direction of the laser beam according to the direction of the normal line, the method further includes:

[0087] S710. Generate an initial laser beam through a preset exciter;

[0088] S720. Shape the initial laser beam through a preset shaping lens group to generate a parallel laser beam.

[0089] In some embodiments, laser shock peening is performed on a target area according to the laser beam after adjusting the polarization direction, including:

[0090] S810. Setting a spot size according to the surface features of the target area, and focusing the laser beam after adjusting the polarization direction according to the spot size, so that the spot formed by the horizontal laser beam in the target area coincides with the target area; coincidence means that the spot generated by the laser beam is consistent in size and shape with the target area and overlaps; specifically, the laser beam is irradiated according to the cross-sectional size and incident angle simulated by the model, so that the shape and size of the generated spot can be consistent with the shape and size of the target area;

[0091] S820. Perform laser shock peening on the target area using the focused laser beam.

[0092] The specific implementation process is as follows Figure 4 As shown:

[0093] (1) Establishing a three-dimensional model of the component, obtaining multiple target areas by analyzing the spatial positioning relationship between the three-dimensional model of the component to be strengthened and the laser beam model; and evenly arranging the multiple target areas obtained during the model simulation process on the surface of the component;

[0094] (2) generating a processing path according to the order of the multiple target areas, and starting processing from the first target area in the processing path;

[0095] (3) Adjust the processing position according to the coordinates of the target area;

[0096] (4) adjusting the angle of the half wave plate according to the polarization state of the target area;

[0097] (5) irradiating the target area with the adjusted laser to perform processing;

[0098] (6) Determine whether the processing is completed. If there is a next target area in the processing path, return to step (3) to continue processing. If there is no next target area in the processing path, proceed to step (7);

[0099] (7) Complete the laser shock peening process.

[0100] The present invention provides a method for laser shock strengthening the inner wall of a large hole based on dynamic regulation of light beam polarization. The method extracts the surface features of a target area in a component and obtains the normal of the target area according to the surface features. When laser shock strengthening is performed on the target area, the polarization direction of the laser beam is adjusted according to the normal of the target area, so that the normal direction is always the same as or opposite to the polarization direction of the laser beam. Therefore, no matter which part of the surface of the component is subjected to laser shock strengthening, the laser polarization state can be kept unchanged, thereby ensuring that the strengthening effects of various parts of the component are consistent.

[0101] like Figure 5 As shown, the present invention also provides a large hole inner wall laser shock peening system based on dynamic control of beam polarization, which is used to perform laser shock peening on a target area of ​​a component 8, comprising:

[0102] An acquisition module, used to obtain surface features of a target area;

[0103] A calculation module is used to calculate the surface features of the target area and obtain the normal line of the center position of the target area;

[0104] An adjustment module, used for adjusting the polarization direction of the laser beam 3 according to the direction of the normal line, so that the direction of the normal line is the same as or opposite to the polarization direction of the laser beam 3;

[0105] The shock peening module is used to perform laser shock peening on the target area according to the laser beam 63 after adjusting the polarization direction.

[0106] The large hole inner wall laser shock strengthening system based on dynamic control of beam polarization in the present invention also includes:

[0107] The beam shaping lens group 2 is used to shape the polarized laser beam 1 to generate a laser beam 3;

[0108] The focusing lens group 7 is used to focus the laser beam 63 after adjusting the polarization direction, and perform laser shock peening on the target area through the focused laser beam 3.

[0109] In some embodiments, the adjustment module includes:

[0110] A control unit 12, for generating a rotation signal according to the direction of the normal line;

[0111] The motor 10 is used to rotate according to the rotation signal; the motor 10 is connected to the control unit 12 via the control bus 11;

[0112] The half wave plate 4 is connected to the output shaft of the motor 10 through a preset transmission assembly, and is used to rotate along with the output shaft of the motor 10 to adjust the polarization direction of the laser beam 3 .

[0113] Specifically, the transmission assembly includes a first transmission wheel 9 and a second transmission wheel 5. The cylindrical surfaces of the first transmission wheel 9 and the second transmission wheel 5 are in contact with each other to realize transmission. The first transmission wheel 9 is arranged on the output shaft of the motor 10, and the second transmission wheel 5 is arranged on the half wave plate 4. The motor 10 rotates the first transmission wheel 9, thereby driving the second transmission wheel 5 and the half wave plate 4 to rotate, thereby adjusting the polarization direction of the laser beam 3.

[0114] The present invention provides a large-hole inner wall laser shock strengthening system based on dynamic regulation of beam polarization. The system extracts the surface features of a target area in a component and obtains the normal of the target area according to the surface features. When the target area is laser shock strengthened, the polarization direction of the laser beam is adjusted according to the normal of the target area, so that the normal direction is always the same as or opposite to the polarization direction of the laser beam. Therefore, no matter which part of the surface of the component is impact strengthened by the laser beam, the laser polarization state can be kept unchanged, thereby ensuring that the strengthening effect of each part of the component is consistent.

[0115] This embodiment further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, any one of the methods in this embodiment is implemented.

[0116] This embodiment also provides an electronic terminal, including: a processor and a memory;

[0117] The memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the terminal executes any one of the methods in this embodiment.

[0118] The computer-readable storage medium in this embodiment can be understood by ordinary technicians in this field: all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to the computer program. The aforementioned computer program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

[0119] The electronic terminal provided in this embodiment includes a processor, a memory, a transceiver and a communication interface. The memory and the communication interface are connected to the processor and the transceiver and complete communication with each other. The memory is used to store computer programs, the communication interface is used to communicate, and the processor and the transceiver are used to run computer programs so that the electronic terminal executes each step of the above method.

[0120] In this embodiment, the memory may include a random access memory (RAM), and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0121] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0122] In the above-mentioned embodiments, although the present invention has been described in conjunction with the specific embodiments of the present invention, many replacements, modifications and variations of these embodiments will be apparent to those of ordinary skill in the art based on the foregoing description. The embodiments of the present invention are intended to cover all such replacements, modifications and variations falling within the broad scope of the appended claims.

[0123] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A laser shock strengthening method for the inner wall of a large hole based on dynamic control of beam polarization, characterized in that: It is used to perform laser shock strengthening on the target area of ​​the surface of the component by laser beam, including the steps: Acquiring surface features of the target area; Calculating the surface features of the target area to obtain a normal line of the center position of the target area; Adjusting the polarization direction of the laser beam according to the direction of the normal line so that the direction of the normal line is the same as or opposite to the polarization direction of the laser beam; The target area is laser-shock-peened according to the laser beam with the polarization direction adjusted.

2. The method for laser shock peening of the inner wall of a large hole based on dynamic control of beam polarization according to claim 1 is characterized in that: Acquiring the surface features of the target area includes: Acquiring geometric features of the component, establishing a component model according to the geometric features of the component, and establishing a laser beam model according to predefined data; According to the laser beam model and the component model, simulate the laser beam irradiating the component at a preset incident angle, and obtain a projection area of ​​the laser beam projected onto the surface of the component according to the simulation result; The features of the projection area are used as the surface features of the target area.

3. The method for laser shock peening of the inner wall of a large hole based on dynamic control of beam polarization according to claim 1 is characterized in that: The component includes a plurality of target areas, and after laser shock peening is performed on the target areas according to the laser beam after adjusting the polarization direction, the component further includes: Select the next target area according to the preset order; re-adjusting the polarization direction of the laser beam according to the direction of the normal line of the next target area; The next target area is laser-shock-peened according to the laser beam after the polarization direction is adjusted again, until the laser-shock-peening of all target areas is completed.

4. The method for laser shock strengthening of the inner wall of a large hole based on dynamic control of beam polarization according to claim 3 is characterized in that: The next target area is selected according to the preset sequence, including: Connecting the plurality of target areas in a preset order to generate a processing path; The next target area is selected according to the position of the target area in the processing path.

5. The method for laser shock peening of the inner wall of a large hole based on dynamic control of beam polarization according to claim 1, characterized in that: Before adjusting the polarization direction of the laser beam according to the direction of the normal line, the method further includes: generating an initial laser beam by a preset exciter; The initial laser beam is shaped by a preset shaping lens group to generate a parallel laser beam.

6. The method for laser shock peening of the inner wall of a large hole based on dynamic control of beam polarization according to claim 1, characterized in that: The target area is subjected to laser shock peening according to the laser beam after adjusting the polarization direction, including: Setting a spot size according to the surface features of the target area, and focusing the laser beam after adjusting the polarization direction according to the spot size, so that the spot formed by the laser beam in the target area coincides with the target area; The target area is laser-shock-peened by a focused laser beam.

7. A laser shock peening system for the inner wall of a large hole based on dynamic control of beam polarization, characterized in that: Used for laser shock peening of targeted areas of components, including: An acquisition module, used for acquiring the surface features of the target area; A calculation module, used for calculating the surface features of the target area to obtain a normal line of the center position of the target area; an adjustment module, configured to adjust the polarization direction of the laser beam according to the direction of the normal line, so that the direction of the normal line is the same as or opposite to the polarization direction of the laser beam; The shock peening module is used to perform laser shock peening on the target area according to the laser beam after adjusting the polarization direction.

8. The large hole inner wall laser shock peening system based on dynamic control of beam polarization according to claim 7 is characterized in that: The adjustment module comprises: A control unit, configured to generate a rotation signal according to the direction of the normal line; a motor, configured to rotate according to the rotation signal; The half wave plate is connected to the output shaft of the motor through a preset transmission component, and is used to rotate along with the output shaft of the motor to adjust the polarization direction of the laser beam.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

10. An electronic terminal, characterized in that: include: Processor and memory; The memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the terminal executes the method according to any one of claims 1 to 6.

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