阅读说明：本技术 一种实时评估喷射阀参数的视觉系统及视觉方法 (Visual system and visual method for evaluating parameters of injection valve in real time ) 是由 郑晔 时曦 贾远鸿 黄卜夫 于 2021-08-19 设计创作，主要内容包括：本发明公开了一种实时评估喷射阀参数的视觉系统及视觉方法,所述视觉系统包括：阀控制器,用于产生点胶信号同时发送给喷射阀和延时电路；喷射阀,用于根据所述点胶信号喷射胶水,形成胶滴飞出；延时电路,用于根据所述点胶信号开始延时计时,在预设延时时间到期后,产生拍照信号发送给相机；相机,用于根据所述拍照信号精确捕捉到胶滴,拍摄所述胶滴在飞行中的瞬间形态的照片,以用于实时地评估喷射阀参数的效果。通过本发明实施例,使用普通相机精确捕捉到胶滴并清楚的拍摄出胶滴在飞行中的瞬间形态照片,以实时地评估喷射阀参数的效果,以便在生产现场有效地指导操作人员进一步调节喷射阀参数,且所述相机为普通相机,降低企业的生产成本。(The invention discloses a visual system and a visual method for evaluating parameters of an injection valve in real time, wherein the visual system comprises: the valve controller is used for generating a dispensing signal and sending the dispensing signal to the injection valve and the delay circuit simultaneously; the injection valve is used for injecting glue according to the glue dispensing signal to form glue droplets to fly out; the time delay circuit is used for starting time delay timing according to the dispensing signal, generating a photographing signal and sending the photographing signal to the camera after the preset time delay time is expired; and the camera is used for accurately capturing the glue drops according to the photographing signal and photographing the instantaneous form pictures of the glue drops in flight so as to evaluate the effect of the parameters of the injection valve in real time. According to the embodiment of the invention, the common camera is used for accurately capturing the glue drops and clearly shooting the instantaneous form photos of the glue drops in flight so as to evaluate the effect of the parameters of the injection valve in real time, so that the operator is effectively guided to further adjust the parameters of the injection valve in a production field, and the common camera is used for reducing the production cost of enterprises.)

1. A vision system for real-time evaluation of injection valve parameters, the vision system comprising: the device comprises a valve controller, an injection valve, a time delay circuit and a camera; wherein:

the valve controller is used for generating a dispensing signal and sending the dispensing signal to the injection valve and the delay circuit simultaneously;

the injection valve is used for injecting glue according to the glue dispensing signal to form glue droplets to fly out;

the time delay circuit is used for starting time delay according to the dispensing signal, generating a photographing signal after the preset time delay is expired, and sending the photographing signal to the camera;

the camera is arranged below the injection valve, is perpendicular to a path through which the glue drops pass, and is used for accurately capturing the glue drops according to the photographing signal and shooting pictures of instantaneous shapes of the glue drops in flight so as to evaluate the effect of parameters of the injection valve in real time.

2. The vision system of claim 1, wherein said injection valve comprises a valve body and a nozzle, said valve body being electrically connected to said valve controller for injecting glue in response to said dispensing signal; the nozzle is arranged below the valve body, is communicated with the valve body and is used for forming the sprayed glue into drops to be sprayed out.

3. The vision system as claimed in claim 1, wherein said camera comprises a lens, said lens is located on the same plane and perpendicular to the path of said glue drop, for capturing said glue drop accurately according to said photographing signal, taking a picture of the instantaneous form of said glue drop in flight, for evaluating the effect of the injection valve parameters in real time.

4. The vision system as claimed in claim 1, further comprising a light source disposed opposite to the camera and on the same horizontal line as the camera for providing light required for the camera to photograph according to the photographing signal.

5. The vision system as claimed in claim 1, characterized in that it further comprises evaluation means for evaluating in real time the effect of the parameters of the injection valve on the basis of the pictures of the glue drops taken by said camera.

6. A visual system as claimed in claim 5 further comprising display means for displaying the assessment effect of the assessment means.

7. A visual method for evaluating injection valve parameters in real time is applied to a visual system for evaluating the injection valve parameters in real time, and is characterized in that the visual system comprises: the device comprises a valve controller, an injection valve, a time delay circuit and a camera; wherein the visual method comprises:

the valve controller generates a dispensing signal and simultaneously sends the dispensing signal to the injection valve and the delay circuit;

the injection valve injects glue according to the glue dispensing signal to form glue drops to fly out;

the time delay circuit starts time delay timing according to the dispensing signal, and generates a photographing signal to send to the camera after the preset time delay time is expired;

the camera accurately captures the glue drops according to the photographing signals, and photographs the instantaneous shapes of the glue drops in flight so as to evaluate the effect of parameters of the injection valve in real time.

8. A visual method as claimed in claim 7, wherein said visual system further comprises a light source, said visual method further comprising: the light source provides required light for the camera to shoot according to the shooting signal.

9. The vision method of claim 7, wherein the vision system further comprises an evaluation device, the vision method further comprising: the evaluation device evaluates the effect of the parameters of the injection valve in real time according to the glue drop photos taken by the camera.

10. A visual method as claimed in claim 9, wherein said visual system further comprises a display device, said visual method further comprising: the display device displays the evaluation effect of the evaluation device.

Technical Field

The invention relates to the field of injection dispensing, in particular to a visual system and a visual method for evaluating parameters of an injection valve in real time.

Background

Spray dispensing is a commonly used glue adhering process at present, and is mainly applied in the field of medium precision dispensing, such as 3C products, mobile terminals, semiconductors, and the like.

The injection valve is an important component of the injection dispensing equipment, and various parameters, such as development time, striker stroke and the like, need to be adjusted during the use process of the injection valve. These parameters determine the size of the drops ejected by the ejection valves, the flight speed of the drops, the form of the drops, etc.

At present, in order to better design an injection valve and know the glue spraying effect of the current injection valve design, a high-speed camera is generally used for photographing. However, the method of taking pictures by using the high-speed camera increases the production cost of enterprises due to the high cost of the high-speed camera, cannot be applied in a large scale, is limited in use, and is inconvenient for effectively guiding operators to further adjust the parameters of the injection valve in a production field.

Disclosure of Invention

In view of the above, the embodiment of the invention provides a vision system and a vision method for evaluating parameters of an injection valve in real time, which use a common camera to capture a glue drop accurately and shoot a clear instantaneous form photo of the glue drop in flight so as to evaluate the effect of the parameters of the injection valve in real time, so as to effectively guide an operator to further adjust the parameters of the injection valve in a production site, and the camera is a common camera, thereby reducing the production cost of an enterprise.

The technical scheme adopted by the invention for solving the technical problems is as follows:

according to an aspect of an embodiment of the present invention, there is provided a vision system for real-time evaluation of injection valve parameters, the vision system comprising: the device comprises a valve controller, an injection valve, a time delay circuit and a camera; wherein:

the valve controller is used for generating a dispensing signal and sending the dispensing signal to the injection valve and the delay circuit simultaneously;

the injection valve is used for injecting glue according to the glue dispensing signal to form glue droplets to fly out;

the time delay circuit is used for starting time delay according to the dispensing signal, generating a photographing signal after the preset time delay is expired, and sending the photographing signal to the camera;

the camera is arranged below the injection valve, is perpendicular to a path through which the glue drops pass, and is used for accurately capturing the glue drops according to the photographing signal and shooting pictures of instantaneous shapes of the glue drops in flight so as to evaluate the effect of parameters of the injection valve in real time.

In one possible design, the injection valve comprises a valve body and a nozzle, and the valve body is electrically connected with the valve controller and is used for injecting glue according to the dispensing signal; the nozzle is arranged below the valve body, is communicated with the valve body and is used for forming the sprayed glue into drops to be sprayed out.

In one possible design, the camera includes a lens, the lens is located on the same plane as and perpendicular to the path through which the glue drops pass, and is configured to accurately capture the glue drops according to the photographing signal, and take a picture of the instantaneous shape of the glue drops in flight, so as to evaluate the effect of the parameters of the injection valve in real time.

In one possible design, the vision system further includes a light source, which is disposed opposite to the camera and on the same horizontal line with the camera, and is used for providing required light for the camera to shoot according to the shooting signal.

In one possible design, the vision system further comprises evaluation means for evaluating in real time the effect of the parameters of the injection valve on the basis of a photograph of the glue drops taken by the camera.

In one possible design, the vision system further includes a display device for displaying the evaluation effect of the evaluation device.

According to another aspect of an embodiment of the present invention, there is provided a visual method for real-time evaluation of injection valve parameters, applied to a visual system for real-time evaluation of injection valve parameters, the visual system comprising: the device comprises a valve controller, an injection valve, a time delay circuit and a camera; wherein the visual method comprises:

the valve controller generates a dispensing signal and simultaneously sends the dispensing signal to the injection valve and the delay circuit;

the injection valve injects glue according to the glue dispensing signal to form glue drops to fly out;

the time delay circuit starts time delay timing according to the dispensing signal, and generates a photographing signal to send to the camera after the preset time delay time is expired;

the camera accurately captures the glue drops according to the photographing signals, and photographs the instantaneous shapes of the glue drops in flight so as to evaluate the effect of parameters of the injection valve in real time.

In one possible design, the vision system further includes a light source, and the vision method further includes: the light source provides required light for the camera to shoot according to the shooting signal.

In one possible design, the vision system further includes an evaluation device, and the vision method further includes: the evaluation device evaluates the effect of the parameters of the injection valve in real time according to the glue drop photos taken by the camera.

In one possible design, the vision system further includes a display device, and the vision method further includes: the display device displays the evaluation effect of the evaluation device.

Compared with the prior art, the visual system and the visual method for evaluating the parameters of the injection valve in real time provided by the embodiment of the invention have the advantages that the valve controller generates a dispensing signal and sends the dispensing signal to the injection valve and the delay circuit, the injection valve sprays glue according to the dispensing signal to form a glue drop flying out, the delay circuit starts delay timing according to the dispensing signal, a photographing signal is generated and sent to the camera after the preset delay time is reached, the camera accurately captures the glue drop according to the photographing signal, and clearly captures a single or multiple pictures of the instantaneous shape of the glue drop in the flying process for evaluating the effect of the parameters of the injection valve in real time so as to effectively guide an operator to further regulate the parameters of the injection valve in a production field; and the camera is a common camera, is not a high-speed camera, has low cost, can be applied in a large scale, and is not limited in use, so that the production cost of enterprises is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a vision system for evaluating parameters of an injection valve in real time according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a vision system for evaluating parameters of an injection valve in real time according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a vision system for evaluating parameters of an injection valve in real time according to an embodiment of the present invention.

FIG. 4 is a flowchart illustrating a visual method for real-time evaluation of injection valve parameters according to an embodiment of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

In one embodiment, as shown in FIG. 1, the present invention provides a vision system for real-time evaluation of injection valve parameters, the vision system comprising: a valve controller 11, an injection valve 12, a delay circuit 13 and a camera 14; wherein:

the valve controller 11 is electrically connected to the injection valve 12 and the delay circuit 13, and configured to generate a dispensing signal and send the dispensing signal to the injection valve 12 and the delay circuit 13 at the same time.

And the injection valve 12 is used for injecting glue according to the glue dispensing signal to form glue drops to fly out.

The delay circuit 13 is electrically connected to the camera 14, and configured to start delay timing according to the dispensing signal, generate a photographing signal after a preset delay time expires, and send the photographing signal to the camera 14.

The camera 14 is disposed below the injection valve 12 and perpendicular to a path through which the glue drops pass, and is configured to accurately capture the glue drops according to the photographing signal, and photograph instantaneous shapes of the glue drops in flight, so as to evaluate the effect of parameters of the injection valve 12 in real time.

In the embodiment, a dispensing signal is generated by a valve controller and is simultaneously sent to an injection valve and a delay circuit, the injection valve sprays glue according to the dispensing signal to form glue droplets flying out, the delay circuit starts delay timing according to the dispensing signal, generates a photographing signal and sends the photographing signal to a camera after a preset delay time is reached, the camera accurately captures the glue droplets according to the photographing signal, clearly shoots a single or multiple pictures of the instantaneous shape of the glue droplets in the flying process, and the single or multiple pictures are used for evaluating the effect of injection valve parameters in real time so as to effectively guide an operator to further adjust the injection valve parameters in a production field; and the camera is a common camera, is not a high-speed camera, has low cost, can be applied in a large scale, and is not limited in use, so that the production cost of enterprises is reduced.

In one embodiment, the valve controller 11 is electrically connected to the injection valve 12 and the delay circuit 13, respectively, and configured to generate a dispensing signal and send the dispensing signal to the injection valve 12 and the delay circuit 13 simultaneously.

The injection valve 12 and the delay circuit 13 receive the dispensing signal at the same time.

The injection valve 12 injects glue according to the glue dispensing signal to form glue drops which fly out of the injection valve 12; the delay circuit 13 starts delay timing according to the dispensing signal. Therefore, the dispensing signal simultaneously becomes a signal mark for the injection valve 12 to start dispensing the dispensing water and the delay circuit 13 to start timing.

The moment when the firing pin is impacted by the injection valve 12 is the time for starting to inject the glue, and the time delay circuit 13 starts to delay and time; the preset delay time set by the circuit 13 expires at the instant when the injection valve 12 injects a droplet of glue to fly out of the injection valve.

In one embodiment, the preset delay time is a delay time configured by the delay circuit 13 according to parameters of the injection valve 12. When the delay circuit 13 receives the dispensing signal and starts timing, it is the moment when the injection valve 12 injects the dispensing droplet to fly out of the injection valve when the preset delay time expires. At this time, the delay circuit 13 generates a photographing signal and sends the photographing signal to the camera 14, so that the camera 14 accurately captures the glue droplets and photographs the instantaneous shape of the clear glue droplets in flight.

From the perspective of the injection valve 12, the delay time configured for the injection valve parameter is set to the preset delay time by the delay circuit 13 during the period from the instant when the injection valve 12 receives the dispensing signal to give the impact of the striker to the instant when the injection valve 12 ejects the glue droplet out of the injection valve.

In order to shoot the glue drops flying at high speed, the camera must be given the precise time point for shooting, and the camera can capture the moment when the glue drops fly out of the injection valve and shoot the picture of the moment when the glue drops fly out according to the precise time point.

In this embodiment, an accurate adjustable delay circuit based on the output IO signal of the valve controller is used, and the delay circuit forms a preset delay time according to the delay time configured by the parameters of the injection valve, so that the preset delay time becomes an accurate time point for the camera to take a picture of the moment when the glue droplet flies out, and therefore the camera captures the moment when the glue droplet flies out of the injection valve according to the accurate time point, accurately captures the glue droplet, captures the picture of the moment when the glue droplet flies out, and captures a clear instantaneous shape of the glue droplet in flight.

Further, the delay circuit 13 may be implemented by using an existing delay circuit structure, and further details of a specific structural form of the delay circuit are not described herein.

In one embodiment, as shown in fig. 2, the injection valve 12 includes a valve body 121 and a nozzle 122, the valve body 121 is electrically connected to the valve controller 11 for filling with glue and injecting the glue according to the glue dispensing signal; the nozzle 122 is disposed below the valve body 121, is communicated with the valve body 121, and is configured to spray the spray glue to form a droplet.

In one embodiment, as shown in fig. 2, the camera 14 includes a lens 141, the lens 141 is located on the same plane as and perpendicular to the path of the glue droplet, and is used for capturing the glue droplet accurately according to the photographing signal, and taking a picture of the instantaneous shape of the glue droplet in flight, so as to evaluate the effect of the parameters of the injection valve 12 in real time.

In the present embodiment, the camera 14 is a normal camera, not a high-speed camera. The invention adopts a common camera to replace a high-speed camera, captures the moment when the glue drops fly out of the injection valve, shoots the picture of the moment when the glue drops fly out of the injection valve and shoots a single or a plurality of pictures of the shape when the glue drops fly, and is used for evaluating the effect of the parameters of the injection valve in real time so as to effectively guide an operator to further adjust the parameters of the injection valve on a production site. And the camera is a common camera, is not a high-speed camera, has low cost, can be applied in a large scale, and is not limited in use, so that the production cost of enterprises is reduced.

In one embodiment, as shown in fig. 2, the vision system further includes a light source 15, and the light source 15 is disposed opposite to the camera 14 and on the same horizontal line with the camera 14, and is used for providing required light for the camera 14 to shoot according to the shooting signal. The delay circuit 13 is electrically connected to the light source 15, and sends the photographing signal to the light source 15.

In one embodiment, as shown in fig. 3, the vision system further comprises an evaluation device 16, wherein the evaluation device 16 is electrically connected to the camera 14, and is used for evaluating the effect of the injection valve parameter in real time according to the glue drop photo taken by the camera 14, so as to effectively guide an operator to further adjust the injection valve parameter according to the evaluation effect at the production site.

Optionally, the evaluation device 16 is built into the camera 14 as one of the components of the camera 14. Alternatively, the evaluation device 16 is a separate component that is electrically connected to the camera 14.

In one embodiment, as shown in fig. 3, the vision system further comprises a display device 17, wherein the display device 17 is electrically connected to the evaluation device 16 for displaying the evaluation effect of the evaluation device 16, so as to effectively guide an operator to further adjust the injection valve parameter according to the evaluation effect at the production site.

The evaluation effect displayed by the display device 17 is compared with the preset injection valve effect according to the evaluation effect of the evaluation device 16, and is displayed according to the comparison result. For example: the evaluation effect of the evaluation device 16 is better than the effect of the preset injection valve, and the evaluation effect is excellent; if the evaluation effect of the evaluation device 16 is almost the same as the preset injection valve effect, the evaluation effect is good, and the injection valve parameters are recommended to be maintained or further adjusted; if the evaluation result of the evaluation device 16 is less than the predetermined injection valve effect, the evaluation result is displayed to be less than the predetermined injection valve effect, and further adjustment of the injection valve parameters is recommended.

In one embodiment, as shown in fig. 4, the present invention provides a visual method for real-time evaluation of injection valve parameters, which is applied to the visual system for real-time evaluation of injection valve parameters described in any of the above embodiments, and the visual system includes: the device comprises a valve controller, an injection valve, a time delay circuit and a camera; wherein the visual method comprises:

and S1, the valve controller generates a dispensing signal and sends the dispensing signal to the injection valve and the delay circuit simultaneously.

And S2, the injection valve injects glue according to the glue dispensing signal to form glue drops to fly out.

And S3, the delay circuit starts delay timing according to the dispensing signal, generates a photographing signal after the preset delay time is expired, and sends the photographing signal to the camera.

And S4, the camera accurately captures the glue drops according to the photographing signals, and photographs the instantaneous shapes of the glue drops in flight are taken so as to evaluate the effect of the parameters of the injection valve in real time.

In the embodiment, a dispensing signal is generated by a valve controller and is simultaneously sent to an injection valve and a delay circuit, the injection valve sprays glue according to the dispensing signal to form glue droplets flying out, the delay circuit starts delay timing according to the dispensing signal, generates a photographing signal and sends the photographing signal to a camera after a preset delay time is reached, the camera accurately captures the glue droplets according to the photographing signal, clearly shoots a single or multiple pictures of the instantaneous shape of the glue droplets in the flying process, and the single or multiple pictures are used for evaluating the effect of injection valve parameters in real time so as to effectively guide an operator to further adjust the injection valve parameters in a production field; and the camera is a common camera, is not a high-speed camera, has low cost, can be applied in a large scale, and is not limited in use, so that the production cost of enterprises is reduced.

The valve controller is respectively electrically connected with the injection valve and the delay circuit, generates a dispensing signal and simultaneously sends the dispensing signal to the injection valve and the delay circuit.

And the injection valve and the delay circuit simultaneously receive the dispensing signals.

The injection valve injects glue according to the glue dispensing signal to form glue drops which fly out of the injection valve; and the delay circuit starts delay timing according to the dispensing signal. Therefore, the dispensing signal simultaneously becomes a signal mark for the injection valve to start to inject the dispensing water and the delay circuit to start timing.

The moment when the jet valve gives the impact of the striker is the time for starting to jet the glue, and the time delay circuit starts to delay and time; the preset delay time set by the circuit expires at the instant the injection valve injects a droplet of glue that flies out of the injection valve.

The preset delay time is the delay time configured by the delay circuit according to the number of the injection valves 12. And when the time delay circuit receives the dispensing signal and starts timing, and the preset time delay time expires, the moment that the injection valve sprays the glue drops and flies out of the injection valve is the moment. At the moment, the time delay circuit generates a photographing signal and sends the photographing signal to the camera, so that the camera can accurately capture the glue drops and photograph the clear instantaneous form of the glue drops in flight.

From the perspective of the injection valve, the delay time configured for the injection valve parameter is set to the preset delay time by the delay circuit during the period from the moment the injection valve receives the glue dispensing signal to give the impact of the striker to the moment the injection valve ejects the glue drop out of the injection valve.

In order to shoot the glue drops flying at high speed, the camera must be given the precise time point for shooting, and the camera can capture the moment when the glue drops fly out of the injection valve and shoot the picture of the moment when the glue drops fly out according to the precise time point. The method comprises the steps that through an accurate adjustable delay circuit based on IO signals output by a valve controller, a preset delay time is formed by the delay circuit according to the delay time configured by parameters of an injection valve, the preset delay time is made to be an accurate time point of a camera for shooting a picture of the moment when a glue drop flies out, so that the camera captures the moment when the glue drop flies out of the injection valve according to the accurate time point, the glue drop is accurately captured, the picture of the moment when the glue drop flies out is shot, and the clear instantaneous form of the glue drop in flight is shot.

In one embodiment, the camera comprises a lens, the lens and the path through which the glue drops pass are positioned on the same plane and perpendicular to the path through which the glue drops pass, the glue drops are accurately captured according to the photographing signal, and a picture of the instantaneous shape of the glue drops in flight is taken for evaluating the effect of the parameters of the injection valve in real time.

In this embodiment, the camera is a normal camera, not a high-speed camera. The invention adopts a common camera to replace a high-speed camera, captures the moment when the glue drops fly out of the injection valve, shoots the picture of the moment when the glue drops fly out of the injection valve and shoots a single or a plurality of pictures of the shape when the glue drops fly, and is used for evaluating the effect of the parameters of the injection valve in real time so as to effectively guide an operator to further adjust the parameters of the injection valve on a production site. And the camera is a common camera, is not a high-speed camera, has low cost, can be applied in a large scale, and is not limited in use, so that the production cost of enterprises is reduced.

In one embodiment, the vision system further comprises a light source disposed opposite the camera and in a same horizontal line as the camera; the visual method further comprises: the light source provides required light for the camera to shoot according to the shooting signal. The time delay circuit is electrically connected with the light source and sends the photographing signal to the light source.

In one embodiment, the vision system further comprises an evaluation device electrically connected to the camera; the visual method further comprises: the evaluation device evaluates the effect of the parameters of the injection valve in real time according to the glue drop pictures shot by the camera so as to effectively guide an operator to further adjust the parameters of the injection valve according to the evaluation effect on a production site.

In one embodiment, the vision system further comprises a display device electrically connected to the evaluation device; the visual method further comprises: the display device displays the evaluation effect of the evaluation device so as to effectively guide an operator to further adjust the parameters of the injection valve according to the evaluation effect on a production site.

The evaluation effect displayed by the display device is compared with the preset injection valve effect according to the evaluation effect of the evaluation device, and the evaluation effect is displayed according to the comparison result. For example: the evaluation effect of the evaluation device is better than the effect of a preset injection valve, and the evaluation effect is excellent; if the evaluation effect of the evaluation device is almost the same as the preset injection valve effect, the evaluation effect is good, and the injection valve parameters are recommended to be kept or further adjusted; and if the evaluation effect of the evaluation device is worse than the preset injection valve effect, the evaluation effect is displayed to be worse, and the injection valve parameter is recommended to be further adjusted.

It should be noted that the method embodiment and the system embodiment belong to the same concept, and specific implementation processes thereof are described in detail in the system embodiment, and technical features in the system embodiment are correspondingly applicable in the method embodiment, which is not described herein again.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.