阅读说明：本技术 刀具寿命修正方法、装置、计算机设备和存储介质 (Tool life correction method, tool life correction device, computer device, and storage medium ) 是由 成亚飞 郭小川 于 2021-09-17 设计创作，主要内容包括：本发明涉及一种刀具寿命修正方法、装置、计算机设备和存储介质,上述方法应用于数控加工中心中,具体通过获取刀具的累计切削时间和该刀具对应所工件材质的刀损系数,根据刀具当次加工时间和刀损系数,确定刀具当次加工的校准切削时间,然后根据校准切削时间,确定刀具在加工后的累计切削时间,这样能够在刀具切削不同材质工件时根据工件硬度来修正最后的刀具真实寿命,有效解决刀具切削时间不准的情况,从而提高刀具使用寿命的精确性。(The invention relates to a method, a device, computer equipment and a storage medium for correcting the service life of a cutter, which are applied to a numerical control machining center.)

1. A cutter service life correction method is applied to a numerical control machining center and is characterized by comprising the following steps:

acquiring accumulated cutting time T1 before machining of a currently used first tool in a numerical control machining center and a tool loss coefficient A corresponding to the current workpiece cut by the first tool;

after the first cutter finishes processing the current workpiece, acquiring the cutting time T actually used by the first cutter in the current workpiece processing process;

determining a calibration cutting time T3 used by the first cutter in the current workpiece machining process according to the tool loss coefficient A and the cutting time T;

and determining the calibrated cumulative cutting time T4 of the first tool after machining according to the cumulative cutting time T1 and the calibrated cutting time T3.

2. The method for correcting the service life of the tool according to claim 1, wherein the obtaining of the accumulated cutting time T1 before the current use of the first tool in the numerical control machining center for machining and the tool loss coefficient a corresponding to the current workpiece being machined by the first tool comprises:

acquiring the accumulated cutting time T1 of the first cutter according to the cutter life database;

and acquiring a tool loss coefficient A corresponding to the current workpiece cut by the first tool according to a tool loss coefficient database, the tool number of the first tool and the material of the current workpiece.

3. The tool life correction method of claim 1, wherein said obtaining the cutting time T actually used by the first tool for the current workpiece machining process comprises:

and acquiring the accumulated cutting time T2 of the first cutter after machining in the numerical control machining center, and subtracting the accumulated cutting time T1 from the accumulated cutting time T2 to obtain the cutting time T actually used by the first cutter in the current workpiece machining process.

4. The tool life correction method of claim 1, wherein said determining a calibrated cutting time T3 for said first tool to use for said current workpiece machining process based on said tool loss factor a and said cutting time T comprises:

and multiplying the tool loss coefficient A and the cutting time T2 to determine a calibrated cutting time T3 used by the first cutter for the current workpiece machining process.

5. The tool life correction method of claim 1, wherein said determining a calibrated cumulative cutting time T4 of said first tool after machining based on said cumulative cutting time T1 and said calibrated cutting time T3 comprises:

and adding the calibration chip time T3 to the accumulated cutting time T1 to obtain a calibration accumulated cutting time T4 of the first tool after machining.

6. The tool life correction method of claim 1, further comprising:

when the accumulated cutting time of the cutter is longer than the preset cutting time of the cutter, alarming processing is carried out; the preset cutting time is the preset maximum service time of the cutting tool for cutting;

and after the new cutter is replaced to the numerical control machining center, clearing the accumulated cutting time of the cutter.

7. The tool life correction method of any one of claims 1-6, further comprising:

and after the numerical control machining center carries out tool changing operation so as to switch the first tool into a second tool, acquiring the accumulated cutting time T1 of the second tool and a tool loss coefficient A corresponding to the current workpiece cut by the second tool, and executing subsequent steps so as to correct the actual service life of the current workpiece after being machined by the second tool.

8. The utility model provides a cutter life correcting unit, is applied to among the numerical control machining center which characterized in that includes:

the first data acquisition module is used for acquiring the accumulated cutting time T1 before machining of a first tool currently used in the numerical control machining center and a tool loss coefficient A corresponding to the current workpiece cut by the first tool;

the second data acquisition module is used for acquiring the cutting time T actually used by the first tool in the current workpiece machining process after the first tool finishes machining the current workpiece;

the first determining module is used for determining the calibrated cutting time T3 used by the first cutter in the current workpiece machining process according to the tool loss coefficient A and the cutting time T;

and the second determination module is used for determining the calibrated cumulative cutting time T4 of the first tool after machining according to the cumulative cutting time T1 and the calibrated cutting time T3.

9. A computer arrangement comprising a memory and a processor, the memory storing a computer program, wherein the processor when executing the computer program performs the steps of the tool life correction method according to any of claims 1-7.

10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the tool life correction method according to any one of claims 1 to 7.

Technical Field

The invention belongs to the technical field of numerical control machining centers, and particularly relates to a method and a device for correcting the service life of a cutter, computer equipment and a storage medium.

Background

The numerical control machining center is a high-efficiency automatic machine tool which consists of mechanical equipment and a numerical control system and is suitable for machining complex parts; the numerical control machining center has the advantages that the comprehensive machining capacity is high, a plurality of cutters with different types and sizes are stored in the cutter base, a workpiece can finish more machining contents after being clamped once, the machining precision is high, batch workpieces with medium machining difficulty can be machined, the efficiency is 5-10 times that of a common machine tool, especially, machining which cannot be finished by a plurality of common machine tools can be finished, and the numerical control machining center is more suitable for single-piece machining or medium-small batch multi-variety production with complex shapes and high precision requirements.

At present, the service life of a cutter is counted mainly by a method of processing time in a numerical control processing center, and after the processing time of the cutter is recorded to a preset service time, the service life expiration of the cutter is prompted to need to be changed. The method has the problems that when the material of the cutting tool is the same, the service life statistics of the cutting tool is not problematic; however, if the same tool cuts workpieces of different materials, the harder the workpiece is due to different hardness values of the workpieces of different materials, and the actual service life of the tool is shorter, the tool life calculated by simply counting the processing time of the tool is inaccurate, so that some tools are in a damaged state, and the tool life in the system is not expired; while some tool systems indicate the expiration of tool life, the tool may actually continue to be used.

Disclosure of Invention

The invention aims to solve the defects in the prior art at least to a certain extent, and provides a method and a device for correcting the service life of a cutter, computer equipment and a storage medium.

In order to achieve the above object, the present invention provides a method for correcting the tool life, which is applied in a numerical control machining center, and comprises:

acquiring accumulated cutting time T1 before machining of a currently used first tool in a numerical control machining center and a tool loss coefficient A corresponding to the current workpiece cut by the first tool;

after the first cutter finishes processing the current workpiece, acquiring the cutting time T actually used by the first cutter in the current workpiece processing process;

determining a calibration cutting time T3 used by the first cutter in the current workpiece machining process according to the tool loss coefficient A and the cutting time T;

and determining the calibrated cumulative cutting time T4 of the first tool after machining according to the cumulative cutting time T1 and the calibrated cutting time T3.

Optionally, the acquiring an accumulated cutting time T1 before machining currently used by a first tool in the numerical control machining center and a tool loss coefficient a corresponding to the first tool cutting a current workpiece includes:

acquiring the accumulated cutting time T1 of the first cutter according to the cutter life database;

and acquiring a tool loss coefficient A corresponding to the current workpiece cut by the first tool according to a tool loss coefficient database, the tool number of the first tool and the material of the current workpiece.

Optionally, the obtaining of the cutting time T actually used by the first tool for the current workpiece machining process includes:

and acquiring the accumulated cutting time T2 of the first cutter after machining in the numerical control machining center, and subtracting the accumulated cutting time T1 from the accumulated cutting time T2 to obtain the cutting time T actually used by the first cutter in the current workpiece machining process.

Optionally, the determining a calibrated cutting time T3 used by the first tool for the current workpiece machining process according to the tool loss coefficient a and the cutting time T includes:

and multiplying the tool loss coefficient A and the cutting time T2 to determine a calibrated cutting time T3 used by the first cutter for the current workpiece machining process.

Optionally, the determining a calibrated cumulative cutting time T4 of the first tool after machining according to the cumulative cutting time T1 and the calibrated cutting time T3 includes:

and adding the calibration chip time T3 to the accumulated cutting time T1 to obtain a calibration accumulated cutting time T4 of the first tool after machining.

Optionally, the method further comprises:

when the accumulated cutting time of the cutter is longer than the preset cutting time of the cutter, alarming processing is carried out; the preset cutting time is the preset maximum service time of the cutting tool for cutting;

and after the new cutter is replaced to the numerical control machining center, clearing the accumulated cutting time of the cutter.

Optionally, the method further comprises:

and after the numerical control machining center carries out tool changing operation so as to switch the first tool into a second tool, acquiring the accumulated cutting time T1 of the second tool and a tool loss coefficient A corresponding to the current workpiece cut by the second tool, and executing subsequent steps so as to correct the actual service life of the current workpiece after being machined by the second tool.

The invention also provides a cutter life correcting device, which is applied to a numerical control machining center and comprises the following components:

the first data acquisition module is used for acquiring the accumulated cutting time T1 before machining of a first tool currently used in the numerical control machining center and a tool loss coefficient A corresponding to the current workpiece cut by the first tool;

the second data acquisition module is used for acquiring the cutting time T actually used by the first tool in the current workpiece machining process after the first tool finishes machining the current workpiece;

the first determining module is used for determining the calibrated cutting time T3 used by the first cutter in the current workpiece machining process according to the tool loss coefficient A and the cutting time T;

and the second determination module is used for determining the calibrated cumulative cutting time T4 of the first tool after machining according to the cumulative cutting time T1 and the calibrated cutting time T3.

The invention further provides computer equipment which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the tool life correction method when executing the computer program.

The present application further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the tool life correction method described above.

According to the cutter service life correction method, the accumulated cutting time of the cutter and the cutter loss coefficient of the material of the workpiece corresponding to the cutter are obtained, the calibration cutting time of the current machining of the cutter is determined according to the current machining time and the cutter loss coefficient of the cutter, and then the accumulated cutting time of the cutter after machining is determined according to the calibration cutting time, so that the real service life of the final cutter can be corrected according to the hardness of the workpiece when the cutter cuts workpieces of different materials, the problem that the cutting time of the cutter is inaccurate is effectively solved, and the accuracy of the service life of the cutter is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a block diagram of a computer device according to an embodiment of the present application;

FIG. 2 is a schematic flow chart illustrating a method for correcting tool life according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of program modules of a tool life correction apparatus according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and should not be construed as limiting the present invention, and all other embodiments that can be obtained by one skilled in the art based on the embodiments of the present invention without inventive efforts shall fall within the scope of protection of the present invention.

The numerical control machining center consists of a numerical control machine tool and computer equipment, wherein the numerical control machine tool is provided with a tool magazine for storing a plurality of tools with different tool numbers, and the computer equipment controls the numerical control machine tool to process a clamped workpiece by adopting each tool in the tool magazine.

In the embodiment, the computer device is taken as an internal computer terminal of a numerical control machining center for illustration; the internal structure of which can be seen in fig. 1, the computer device comprises a processor 101, a memory 102, a communication interface 103, a display screen 104 and an input device 105, which communicate with each other via one or more communication buses 106.

It will be appreciated that the configuration shown in fig. 1 is merely illustrative and is not intended to limit the configuration of the computer device. The computer device may also include more or fewer components than shown in FIG. 1, or have a different configuration than shown in FIG. 1. The components shown in fig. 1 may be implemented in hardware, software, or a combination thereof.

Specifically, the memory 102 may be used to store an operating system, a computer program, and modules, such as program instructions/modules corresponding to the tool life correction method and apparatus in the embodiments of the present application; the processor 101 is used to provide computing and control capabilities to try out software programs and modules stored in the memory 102 to perform various functional applications and data processing, i.e. to implement the tool life correction method described above.

The Communication interface 103 is used for performing wired or Wireless Communication with an external terminal, and the Wireless Communication may be implemented by a Global System for mobile Communication (GSM), Wireless Fidelity (WiFi), Near Field Communication (NFC), bluetooth or other technologies.

The display screen 104 is used to display data output to the operator, the content of which may include parameters, text, graphics, video, and any combination thereof, and specific examples of the display screen 104 include, but are not limited to, a liquid crystal display, an LED display, or an LCD display. The input device 105 includes a touch layer overlaid on the display screen 104 to receive operator inputs, such as clicking, sliding, and other gesture operations of the operator, so that the user interface responds to the operator inputs with an object, and the touch layer may be based on resistive, capacitive, or any other possible touch detection technology. Of course, the input device 105 may also include one or more of an external keyboard, touchpad, or mouse.

The tool life correction method in the embodiment of the present application is described based on the above-described computer device.

As shown in fig. 2, fig. 2 is a schematic flow chart of a tool life correction method in an embodiment of the present application, and in the embodiment, the tool life correction method includes the following steps:

s10, obtaining the accumulated cutting time T1 of the first tool used in the numerical control machining center before machining and the tool loss coefficient A corresponding to the first tool cutting the current workpiece.

Wherein, the accumulated cutting time is the accumulated processing time of the processing process of the cutter on the numerical control machine tool; when the cutting tools are used for machining workpieces made of different materials, the cutting tool loss coefficients are obtained through test data and used for calibrating the cutting time of each machining of the cutting tools.

Specifically, the numerical control machine tool is controlled by computer equipment to use the same cutter, rotate speed and feed, a plurality of workpieces which are the same in shape and different in material are processed in batches, so that the time when the cutter is worn (damaged) when different materials are processed on the numerical control machine tool is tested, a plurality of actual wear times corresponding to different workpieces in material are obtained, and the cutter loss coefficient when the cutter is used for processing the workpieces in different materials is obtained through the actual wear time/the cutter theoretical cutting time. Namely the tool loss coefficient is the actual wear time/theoretical cutting time of the tool.

The theoretical cutting time of the tool is usually given by a tool manufacturer, and can be obtained by self-testing, for example, the actual wear time of the tool during processing one material (e.g., aluminum material) workpiece by the tool in the above testing process is designated as the theoretical cutting time, the tool loss coefficient of the aluminum material corresponding to the tool is equal to 1, and the actual wear time of the tool during processing other material workpieces is compared with the actual wear time of the aluminum material, so that the tool loss coefficients corresponding to the other materials processed by the tool can be obtained.

It should be understood that the same test mode is sequentially adopted to respectively carry out processing tests on the cutters of different models so as to obtain the cutter loss coefficients of the cutters of different models corresponding to workpieces made of different materials.

In addition, when the hardness value of the workpiece material is smaller than the preset value, the numerical value of the tool loss coefficient a may be set to 0, that is, when the tool is machining a workpiece with hardness smaller than the preset value, the machining time may not be calculated, and the accumulated cutting time of the tool is fixed.

For example, the following table shows a table of tool loss coefficients for different types of tools corresponding to different materials:

steel material	Hardness of steel	Diameter of the tool	Material of cutter	Coefficient of tool loss
					SKD61	HRC40°～45°	10	UTI20T	1.23
SKD61	HRC40°～45°	10	ST10P	1.21
					SKD61	HRC40°～45°	10	UX30	1.17
SKD61	HRC40°～45°	10	EX35	1.12
					NAK80	HRC37°～43°	10	UTI20T	0.82
NAK80	HRC37°～43°	10	ST10P	0.80
					NAK80	HRC37°～43°	10	UX30	0.85
NAK80	HRC37°～43°	10	EX35	0.79

And S20, acquiring the cutting time T actually used by the first tool in the current workpiece machining process after the first tool finishes machining the current workpiece.

In one embodiment, the cutting time T actually used by the first tool for the current workpiece machining process can be obtained by obtaining the accumulated cutting time T2 of the first tool after machining in the numerical control machining center and subtracting the accumulated cutting time T1 from the accumulated cutting time T2. Of course, in some numerical control machining centers, the cutting time of each tool in the next machining process is counted, and the cutting time T actually used by the first tool for the current workpiece machining process can be directly obtained.

And S30, determining the calibrated cutting time T3 used by the first cutter in the current workpiece machining process according to the tool loss coefficient A and the cutting time T.

The calibrated chip time T3 is data obtained by correcting the chip time of the current workpiece machining process by the first tool according to the tool loss coefficient, and the first tool takes the calibrated chip time T3 as the real chip time used for machining the current workpiece.

In one embodiment, the computer device may determine the real cutting time of the first tool in the machining process after the numerically-controlled machine tool switches the first tool to another tool; specifically, the calibrated cutting time T3 used by the first tool for the current workpiece machining process is determined by multiplying the tool loss coefficient A and the cutting time T2.

And S40, determining the calibrated cumulative cutting time T4 of the first tool after machining according to the cumulative cutting time T1 and the calibrated cutting time T3.

The calibration accumulated cutting time T4 is obtained by adding the calibration chip time T3 to the accumulated cutting time T1, and the parameter of the calibration accumulated cutting time T4 is used as the accumulated cutting time of the first tool after machining in the numerical control machining center to correct the real service life of the first tool, namely the calibration accumulated cutting time T4 is the real accumulated cutting time of the first tool after machining.

That is, the value of the calibrated cumulative cutting time T4 is the value of the cumulative cutting time T1 obtained by the computer apparatus executing step S10 again when the numerically controlled machine tool is machined next time using the first tool.

According to the tool life correction method, the accumulated cutting time of the tool and the tool loss coefficient of the material of the workpiece corresponding to the tool are obtained, the calibration cutting time of the current machining of the tool is determined according to the current machining time and the tool loss coefficient of the tool, and then the accumulated cutting time of the tool after machining is determined according to the calibration cutting time, so that the real life of the final tool can be corrected according to the hardness of the workpiece when the tool cuts workpieces with different materials, the problem that the cutting time of the tool is inaccurate is effectively solved, and the accuracy of the service life of the tool is improved.

In one embodiment, the step S10 of obtaining the cumulative cutting time T1 before the current first tool is used in the numerical control machining center for machining and the tool loss coefficient a corresponding to the current workpiece being cut by the first tool specifically includes the following steps: acquiring the accumulated cutting time T1 of the first cutter according to the cutter life database; and acquiring a tool loss coefficient A corresponding to the current workpiece cut by the first tool according to the tool loss coefficient database, the tool number/model of the first tool and the material of the current workpiece.

Specifically, a tool life database and a tool loss coefficient database are stored in the memory 102 of the computer device or an external device, the tool life database records the accumulated cutting time of each tool in the tool magazine of the numerical control machine tool, and the tool loss coefficient database records the tool loss coefficients of each tool in processing corresponding to workpieces made of different materials.

It should be understood that, after the computer device executes the above steps 10 to 40, the obtained value of the calibrated cumulative cutting time T4 of the tool is updated to the tool magazine life database, so as to be used as the new cumulative cutting time of the tool. Therefore, the data in the tool life data is updated as the numerically controlled machine tool is machined.

In one embodiment, the tool life correction method further comprises: when the accumulated cutting time of the cutter is longer than the preset cutting time of the cutter, alarming processing is carried out; presetting cutting time, which is the maximum service time of a preset cutter for cutting; and after the new cutter is replaced to the numerical control machining center, clearing the accumulated cutting time of the cutter.

It can be understood that the preset cutting time of the tool is the above-mentioned theoretical cutting time of the tool, when the cumulative cutting time of the tool is greater than or equal to the preset cutting time, it indicates that the service life of the tool has expired, and the tool is in a worn or nearly worn state, and if the tool is continuously used to machine the workpiece, the dimension of the machined workpiece may not meet the required precision requirement, and a new tool needs to be replaced to machine the workpiece, so as to ensure the dimensional precision of the machined workpiece.

Specifically, the alarm processing includes, but is not limited to, the numerical control machine lighting a red alarm lamp and/or making an alarm sound to lift the operator, and at the same time, the cutter of which cutter number is synchronously displayed on the display screen 104 needs to be replaced. After the operator replaces a new tool on the nc machine tool, the cumulative cutting time corresponding to the new tool in the tool magazine life database is 0, when the nc machine tool switches the new tool to perform the first machining, the cumulative cutting time T1 obtained in step S10 is equal to 0, and after the new tool finishes machining the workpiece, the obtained calibrated cumulative cutting time T4 is updated to the tool magazine life database, that is, the calibrated cumulative cutting time T4 is equal to the cumulative cutting time of the new tool in the tool life database.

In one embodiment, the tool life correction method further comprises: and after the numerical control machining center carries out tool changing operation to switch the first tool into the second tool, acquiring the accumulated cutting time T1 of the second tool and a tool loss coefficient A corresponding to the current workpiece cut by the second tool, and executing subsequent steps to correct the actual service life of the second tool after the current workpiece is machined by the second tool.

That is to say, every time the numerical control machining center carries out tool changing operation to machine a workpiece, the computer device executes the steps S10-40 on the newly changed tool, so that the service lives of all tools of the numerical control machine tool are corrected, the service lives of the tools recorded in the tool magazine service life database are close to the real service life, and the accuracy of the service life of the tools is improved.

Further, an embodiment of the present invention further provides a tool life correction apparatus, which is applied in a numerical control machining center, and as shown in fig. 3, fig. 3 is a schematic diagram of program modules of the tool life correction apparatus in the embodiment of the present invention, the tool life correction apparatus 300 includes:

the first data acquisition module 301 is configured to acquire an accumulated cutting time T1 before machining, which is currently used by a first tool in the numerical control machining center, and a tool loss coefficient a corresponding to a current workpiece cut by the first tool.

The second data obtaining module 302 is configured to obtain a cutting time T actually used by the first tool in the current workpiece processing process after the first tool completes processing the current workpiece.

And the first determining module 303 is configured to determine a calibrated cutting time T3 used by the first tool for the current workpiece machining process according to the tool loss coefficient a and the cutting time T.

The second determination module 304 determines a calibrated cumulative cutting time T4 of the first tool after machining according to the cumulative cutting time T1 and the calibrated cutting time T3.

The utility model provides a cutter life correcting unit, be applied to numerical control machining center, can be through the tool loss coefficient that the accumulative total cut time that obtains the cutter corresponds work piece material with this cutter, according to cutter time of processing and tool loss coefficient, confirm the cutter time of processing the calibration cutting time of processing once, then according to the calibration cutting time, confirm the accumulative cut time of cutter after the processing, can revise final cutter true life according to the work piece hardness when the cutter cuts different material work pieces like this, effectively solve the inaccurate condition of cutter cut time, thereby improve cutter life's accuracy nature.

In the embodiment of the application, the tool life correcting device further comprises a tool magazine life database, a tool loss coefficient database and a correcting module, wherein the tool life database records the accumulated cutting time of each tool in the tool magazine of the numerical control machine tool; the tool loss coefficient database records the tool loss coefficients of the tools corresponding to different materials during processing; and the correction module is used for taking the parameter of the calibrated accumulated cutting time T4 as the accumulated cutting time of the first cutter after machining in the numerical control machining center so as to correct the actual service life of the first cutter.

Each functional module in the embodiments of the present application may be integrated into one processing module, or each module may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.

Still further, the present application also provides a computer readable storage medium, on which a computer program is stored, which when executed by the processor 101, implements the steps of the tool life correction method described above.

It will be understood by those skilled in the art that all or part of the processes of the methods according to the above embodiments may be implemented by a computer program instructing associated hardware, and when the computer program is executed, the processes of the embodiments of the tool life correction method may be implemented. The Memory 102 in the present application may include at least one of a nonvolatile Memory and a volatile Memory, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Dynamic Random Access Memory (DRAM), an erasable Programmable Read-Only Memory (EPROM), a Programmable Read-Only Memory (PROM), a magnetic disk, or an optical disk.

It should be noted that, for the sake of simplicity, the above-mentioned method embodiments are described as a series of acts or combinations, but those skilled in the art should understand that the present invention is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no acts or modules are necessarily required of the invention.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In view of the above description of the technical solutions provided by the present invention, those skilled in the art will recognize that there may be variations in the technical solutions and the application ranges according to the concepts of the embodiments of the present invention, and in summary, the content of the present specification should not be construed as limiting the present invention.