Disclosure of Invention
The present invention provides a device for detecting a degree of contamination on a surface of an object and a cleaning apparatus, which are directed to overcome the above-mentioned drawbacks of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing an object surface dirt degree detection device, which comprises a light emitting module, a light receiving module and a processor, wherein the processor is respectively connected with the light emitting module and the light receiving module, the light emitting module and the light receiving module are positioned at the outer side of a transparent dirt suction pipe, and the transparent dirt suction pipe is used for absorbing cleaning objects generated after the surface of the object is cleaned;
the processor controls the light emitting module to emit the emitted light with preset illumination intensity, the emitted light passes through the transparent dirt suction pipe to be injected into the light receiving module, the light receiving module sends the received light intensity to the processor, the processor searches for the dirt degree corresponding to the received light intensity according to the light intensity and dirt degree comparison table, and the light intensity and dirt degree comparison table is the corresponding relation between the received light intensity and the dirt degree on the surface of the object.
Further, in the device for detecting the degree of contamination on the surface of an object according to the present invention, the transparent contamination suction pipe is located between the light emitting module and the light receiving module, and the emission light is transmitted to the light receiving module through the transparent contamination suction pipe; or
The emission light is reflected by the transparent dirt suction pipe and then enters the light receiving module.
In addition, the invention also provides a device for detecting the degree of dirt on the surface of an object, which comprises a light emitting module, a light receiving module, a voltage dividing module and a processor, wherein the processor is connected with the light emitting module, the light receiving module and the voltage dividing module are connected in series, and the light receiving module and the voltage dividing module are connected with a voltage power supply end after being connected in series; the light emitting module and the light receiving module are positioned on the outer side of the transparent sewage suction pipe, and the transparent sewage suction pipe is used for absorbing cleaning objects generated after the surfaces of the objects are cleaned;
the processor controls the light emitting module to emit the emitted light with preset illumination intensity, the emitted light passes through the transparent dirt suction pipe to enter the light receiving module, the processor collects the partial voltage of the light receiving module or the partial voltage module, and the dirt degree corresponding to the partial voltage is searched according to a voltage and dirt degree comparison table, wherein the voltage and dirt degree comparison table is the corresponding relation between the partial voltage and the dirt degree on the surface of the object.
Further, in the device for detecting the degree of contamination on the surface of an object according to the present invention, the transparent contamination suction pipe is located between the light emitting module and the light receiving module, and the emission light is transmitted to the light receiving module through the transparent contamination suction pipe; or
The emission light is reflected by the transparent dirt suction pipe and then enters the light receiving module.
Further, in the device for detecting a degree of contamination on a surface of an object according to the present invention, the voltage dividing module is a voltage dividing resistor.
In addition, the invention also provides a device for detecting the degree of dirt on the surface of an object, which comprises a light emitting module, a light receiving module, a current limiting module and a processor, wherein the processor is connected with the light emitting module, the light receiving module and the current limiting module are connected in series, after the light receiving module and the current limiting module are connected in series, one end of the light receiving module is connected with a voltage power supply end, and the other end of the light receiving module is connected with the processor; the light emitting module and the light receiving module are positioned on the outer side of the transparent sewage suction pipe, and the transparent sewage suction pipe is used for absorbing cleaning objects generated after the surfaces of the objects are cleaned;
the processor controls the light emitting module to emit emitted light with preset illumination intensity, the emitted light passes through the transparent dirt suction pipe and enters the light receiving module, the processor collects series current of the series circuit of the light receiving module and the current limiting module, and the dirt degree corresponding to the series current is searched according to a current and dirt degree comparison table, wherein the current and dirt degree comparison table is the corresponding relation between the series current and the dirt degree on the surface of an object.
Further, in the device for detecting the degree of contamination on the surface of an object according to the present invention, the transparent contamination suction pipe is located between the light emitting module and the light receiving module, and the emission light is transmitted to the light receiving module through the transparent contamination suction pipe; or
The emission light is reflected by the transparent dirt suction pipe and then enters the light receiving module.
Further, in the device for detecting the degree of contamination on the surface of an object according to the present invention, the current limiting module is a current limiting resistor.
In addition, the invention also provides a cleaning device which comprises the object surface dirt degree detection device.
Further, in the cleaning apparatus of the present invention, an operating parameter of the cleaning apparatus is adjusted according to a degree of contamination.
The device for detecting the degree of dirt on the surface of the object and the cleaning equipment have the following beneficial effects that: the invention utilizes the light transmission principle to detect the surface dirt degree of the object through the influence of the transparent dirt suction pipe on the light transmission, thereby realizing the automatic detection of the surface dirt degree of the object.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
In a preferred embodiment, referring to fig. 1, the apparatus for detecting the degree of contamination on the surface of an object of the present embodiment includes alight emitting module 10, alight receiving module 20, and aprocessor 30, and theprocessor 30 is connected to thelight emitting module 10 and thelight receiving module 20, respectively. Alternatively, thelight emitting module 10 may be an infrared light emitting module, an LED light emitting module, a fluorescent lamp, or other light source; preferably, thelight emitting module 10 is an infrared light emitting module, and the correspondinglight receiving module 20 is an infrared light receiving module. Thelight emitting module 10 and thelight receiving module 20 are located outside the transparentdirt suction pipe 40, the transparentdirt suction pipe 40 is used for absorbing and transporting cleaning objects generated after the surfaces of the objects are cleaned, and the transparentdirt suction pipe 40 is made of a light-transmitting material and can transmit and reflect light emitted by thelight emitting module 10. Alternatively, the transparent soil pick-up tube 40 is a circular tube.
The working principle of the object surface dirt degree detection device is as follows: theprocessor 30 controls thelight emitting module 10 to emit the emitting light with the preset illumination intensity, the emitting light is emitted into thelight receiving module 20 through the transparentdirt suction pipe 40, and the emitting light is attenuated after being absorbed and reflected by the transparentdirt suction pipe 40 and the cleaning objects inside the transparent dirt suction pipe. Thelight receiving module 20 sends the intensity of the received light to theprocessor 30, and theprocessor 30 searches for the contamination degree corresponding to the intensity of the received light according to the light intensity and the contamination degree comparison table. The comparison table of the light intensity and the dirt degree is a corresponding relationship between the intensity of received light and the dirt degree on the surface of the object, that is, each intensity of received light has a corresponding dirt degree, and if the intensity of received light is smaller, the absorption and reflection of the transparentdirt suction pipe 40 and the cleaning object inside the transparent dirt suction pipe to the emitted light are larger, and the dirt degree on the surface of the object is larger; if the intensity of the received light is larger, the absorption and reflection of the emitted light by the transparentsoil suction pipe 40 and the cleaning object inside the transparent soil suction pipe are smaller, and the degree of the surface of the object is smaller. Alternatively, the light intensity and stain level look-up table is stored in theprocessor 30, or the light intensity and stain level look-up table is stored in a memory communicatively connected to theprocessor 30.
It can be understood that the light intensity and contamination degree comparison table is related to the preset illumination intensity and the distance between thelight emitting module 10 and thelight receiving module 20, and different distances correspond to different light intensity and contamination degree comparison tables under the same preset illumination intensity; when the distances are the same, different preset illumination intensities correspond to different light intensity and dirty degree comparison tables. In the actual use process, the corresponding preset illumination intensity and distance can be selected after the light intensity and the pollution degree comparison table is selected; the light intensity and contamination level comparison table may be prepared according to the preset light intensity and distance after thelight emitting module 10 and thelight receiving module 20 are installed.
This embodiment utilizes the light to propagate the principle, detects the dirty degree in object surface through the influence of transparent soil pick-up pipe to the light is propagated, realizes the automated inspection of the dirty degree in object surface. Although this embodiment has a certain hysteresis, this embodiment can reflect the degree of contamination of the surface of the object to some extent, considering that the distribution of the actual contamination has a certain continuity.
In the object surface contamination degree detection apparatus of some embodiments, referring to fig. 2a, the transparentsoil suction pipe 40 is located between thelight emitting module 10 and thelight receiving module 20, that is, the transparentsoil suction pipe 40 is located on the transmission light path of thelight emitting module 10 and thelight receiving module 20, and the transmission light is transmitted to thelight receiving module 20 through the transparentsoil suction pipe 40. It is understood that the transparent soil pick-up pipe 40 may be located at any position on the transmission optical path between thelight emitting module 10 and thelight receiving module 20, may be located near thelight emitting module 10, may also be located near thelight receiving module 20, may also be located in the middle of the transmission optical path between thelight emitting module 10 and thelight receiving module 20, and may be specifically adjusted according to actual installation requirements. For example, referring to fig. 2b, the transparent soil pick-up pipe 40 is a circular pipe, the transparent soil pick-up pipe 40 is located between thelight emitting module 10 and thelight receiving module 20, thelight emitting module 10 and thelight receiving module 20 are located on the same vertical section of the transparent soil pick-up pipe 40, and a connection line between thelight emitting module 10 and thelight receiving module 20 passes through the axis of the transparent soil pick-up pipe 40.
In the object surface contamination degree detection apparatus according to some embodiments, referring to fig. 3a, the transparentcontamination suction pipe 40 is not located on the transmission light path of thelight emitting module 10 and thelight receiving module 20, thelight receiving module 20 is located on the light path after the emission light is reflected by the transparentcontamination suction pipe 40, and the emission light is reflected by the transparentcontamination suction pipe 40 and then enters thelight receiving module 20. For example, referring to fig. 3b, the transparent soil pick-up tube 40 is a circular tube, thelight emitting module 10 and thelight receiving module 20 are located on the same vertical section of the transparent soil pick-up tube 40, and a line connecting the centers of thelight emitting module 10 and thelight receiving module 20 and the vertical section of the transparent soil pick-up tube 40 forms an included angle of 90 °.
In a preferred embodiment, the device for detecting the degree of contamination on the surface of an object of the present embodiment comprises alight emitting module 10, alight receiving module 20, avoltage dividing module 50 and aprocessor 30, wherein thelight emitting module 10 and thelight receiving module 20 are located outside a transparentdirt suction pipe 40, and the transparentdirt suction pipe 40 is used for absorbing cleaning objects generated after the surface of the object is cleaned. Alternatively, thevoltage dividing module 50 is a voltage dividing resistor. Theprocessor 30 is connected to thelight emitting module 10, thelight receiving module 20 is connected to thevoltage dividing module 50 in series, one end of thelight receiving module 20 connected to thevoltage dividing module 50 in series is connected to the voltage supply terminal (VDD), and the other end is grounded. Alternatively, there are two ways of connecting thelight receiving module 20 and thevoltage dividing module 50 in series:
the first series mode: referring to fig. 4a, thevoltage dividing module 50 is connected to the voltage supply terminal (VDD), thelight receiving module 20 is grounded, and the connection point of thelight receiving module 20 and thevoltage dividing module 50 is connected to theprocessor 30, so that theprocessor 30 collects the divided voltage on thelight receiving module 20.
The second series connection mode: referring to fig. 4b, thelight receiving module 20 is connected to a voltage supply terminal (VDD), thevoltage dividing module 50 is grounded, and a connection point of thelight receiving module 20 and thevoltage dividing module 50 is connected to theprocessor 30, so that theprocessor 30 collects the divided voltage on thevoltage dividing module 50.
In the present embodiment, a first series connection manner is taken as an example for principle explanation, and a second series connection manner can be referred to for implementation. The operating principle of the device for detecting the surface contamination degree of the object in the first series connection mode is as follows:
theprocessor 30 controls thelight emitting module 10 to emit the emitting light with the preset illumination intensity, and the emitting light is emitted into thelight receiving module 20 through the transparentdirt suction pipe 40. The resistance of thelight receiving module 20 is different under different illumination conditions, and the resistance of thelight receiving module 20 may be inversely proportional to the received light intensity, i.e. the larger the received light intensity is, the smaller the resistance of thelight receiving module 20 is; the smaller the received light intensity is, the larger the resistance value of thelight receiving module 20 is. The resistance value of thelight receiving module 20 may also be proportional to the received light intensity, i.e. the greater the received light intensity, the greater the resistance value of thelight receiving module 20; the smaller the received light intensity is, the smaller the resistance value of thelight receiving module 20 is.
Thelight receiving module 20 and thevoltage dividing module 50 are connected in series, and according to the principle of serial voltage division, when the resistance of thelight receiving module 20 changes, the divided voltage of thelight receiving module 20 and thevoltage dividing module 50 changes correspondingly, so that the change of the intensity of the received light on thelight receiving module 20 can be reflected by collecting the divided voltage of thelight receiving module 20, and further the influence of the transparent soil pick-uptube 40 on the emitted light can be reflected. Theprocessor 30 collects the divided voltage of thelight receiving module 20, and searches for the contamination degree corresponding to the divided voltage according to the voltage and contamination degree comparison table. Alternatively, theprocessor 30 may collect the divided voltage of thelight receiving module 20 through a voltage sampling circuit. The voltage and dirt degree comparison table is a corresponding relation between a divided voltage and the dirt degree of the surface of an object, namely, each received voltage has a corresponding dirt degree, and the voltage and dirt degree comparison table is described in two cases as follows:
in the first case: when the resistance value of thelight receiving module 20 is inversely proportional to the intensity of the received light, if the divided voltage of thelight receiving module 20 is smaller, it indicates that the intensity of the received light of thelight receiving module 20 is larger, and further indicates that the degree of contamination is smaller; if the divided voltage of thelight receiving module 20 is larger, it indicates that the intensity of the received light of thelight receiving module 20 is smaller, and further indicates that the degree of contamination is larger.
In the second case: when the resistance value of thelight receiving module 20 is proportional to the intensity of the received light, if the divided voltage of thelight receiving module 20 is smaller, it indicates that the intensity of the received light of thelight receiving module 20 is smaller, and further indicates that the degree of contamination is larger; if the divided voltage of thelight receiving module 20 is larger, it indicates that the intensity of the received light of thelight receiving module 20 is larger, and further indicates that the degree of contamination is smaller.
It can be understood that the voltage and contamination level comparison table is related to the preset illumination intensity and the distance between the light emittingmodule 10 and thelight receiving module 20, and different distances correspond to different voltage and contamination level comparison tables under the same preset illumination intensity; when the distances are the same, different preset illumination intensities correspond to different voltage and pollution degree comparison tables. In the actual use process, the corresponding preset illumination intensity and distance can be selected after the voltage and the pollution degree comparison table is selected; alternatively, after thelight emitting module 10 and thelight receiving module 20 are mounted, a voltage and contamination level comparison table may be prepared according to the preset illumination intensity and distance. Alternatively, the voltage to soil comparison table is stored in theprocessor 30, or the voltage to soil comparison table is stored in a memory communicatively coupled to theprocessor 30.
This embodiment utilizes the light to propagate the principle and establishes ties the partial pressure principle, changeslight receiving module 20's resistance value through the influence that transparent soil pick-up pipe propagated to light, and then detects the dirty degree in object surface by establishing ties the partial pressure, realizes the automated inspection of the dirty degree in object surface.
In a preferred embodiment, referring to fig. 5, in this embodiment, thelight emitting module 10 includes a resistor R1 and an infrared emitting tube LED1, thelight receiving module 20 is an infrared receiving tube LED2, and thevoltage dividing module 50 is a resistor R2. The first end of the resistor R1 is connected with a voltage supply terminal (VDD), the second end of the resistor R1 is grounded through the infrared emitting tube LED1, and the infrared emitting tube LED1 is used for emitting infrared light. The first end of the resistor R2 is connected with a voltage supply end (VDD), the second end of the resistor R2 is connected with theprocessor 30, the second end of the resistor R2 is grounded through the infrared receiving tube LED2, the infrared receiving tube LED2 is used for receiving infrared light, and the resistance value of the infrared receiving tube LED2 changes along with the change of the infrared light. The infrared transmitting tube LED1 and the infrared receiving tube LED2 are installed as shown in fig. 2 b. The voltage of the voltage supply terminal (VDD) is 5V.
The working principle of the object surface contamination degree detection circuit is as follows:
if the transparentdirt suction pipe 40 has a small amount of cleaned objects, and when the amount of cleaned objects is close to the amount of cleaned objects, the infrared light emitted by the infrared emission tube LED1 directly passes through the transparentdirt suction pipe 40 to reach the infrared receiving tube LED2, and basically no loss exists, at this time, the resistance of the infrared receiving tube LED2 is small, and the voltage collected by theprocessor 30 tends to zero. That is, if the voltage collected by theprocessor 30 goes to zero, it indicates that the clear soil in thetransparent soil pipe 40 is particularly low, and thus indicates that the surface of the object is less soiled.
If the number of the cleaning objects in the transparentdirt suction pipe 40 is large, the infrared light emitted by the infrared emitting tube LED1 is substantially absorbed by the cleaning objects, almost no infrared light can pass through the transparentdirt suction pipe 40 to reach the infrared receiving tube LED2, at this time, the resistance of the infrared receiving tube LED2 is large, and the voltage collected by theprocessor 30 tends to the voltage supply terminal (VDD), which is about 5V. That is, if the voltage collected by theprocessor 30 is approximately equal to 5V, it indicates that there is a particularly large amount of cleaning material in the transparentsoil suction pipe 40, and thus indicates that the surface of the object is stained to a greater degree.
If the cleaning in the transparentsoil suction pipe 40 is between a particularly small and a particularly large amount, the voltage collected by theprocessor 30 is between 0V and 5V. That is, if the voltage collected by theprocessor 30 is between 0V and 5V, the degree of contamination of the surface of the object can be obtained according to the voltage and contamination level look-up table.
In a preferred embodiment, referring to fig. 6, the apparatus for detecting the degree of contamination on the surface of an object of the present embodiment includes alight emitting module 10, alight receiving module 20, a current limitingmodule 60, and aprocessor 30, wherein theprocessor 30 is connected to thelight emitting module 10, thelight receiving module 20 and the current limitingmodule 60 are connected in series, and after the series connection, one end is connected to a voltage supply terminal (VDD), and the other end is connected to theprocessor 30. In the present embodiment, the current limitingmodule 60 is connected to the voltage supply terminal (VDD), and thelight receiving module 20 is connected to theprocessor 30 for illustration; the case where thelight receiving module 20 is connected to the voltage supply terminal (VDD), and the current limitingmodule 60 is connected to theprocessor 30 can be implemented with reference to the present embodiment. Thelight emitting module 10 and thelight receiving module 20 are located outside the transparentsoil suction pipe 40, and the transparentsoil suction pipe 40 is used for absorbing cleaning objects generated after the surfaces of the objects are cleaned. Alternatively, current limitingmodule 60 is a current limiting resistor.
The working principle of the object surface dirt degree detection device is as follows: theprocessor 30 controls thelight emitting module 10 to emit the emitting light with the preset illumination intensity, and the emitting light is emitted into thelight receiving module 20 through the transparentdirt suction pipe 40. The resistance of thelight receiving module 20 is different under different illumination conditions, and the resistance of thelight receiving module 20 may be inversely proportional to the received light intensity, i.e. the larger the received light intensity is, the smaller the resistance of thelight receiving module 20 is; the smaller the received light intensity is, the larger the resistance value of thelight receiving module 20 is. The resistance value of thelight receiving module 20 may also be proportional to the received light intensity, i.e. the greater the received light intensity, the greater the resistance value of thelight receiving module 20; the smaller the received light intensity is, the smaller the resistance value of thelight receiving module 20 is.
Thelight receiving module 20 has different resistance values under different lighting conditions, and on the premise that the voltage supply terminal (VDD) is not changed, the change of thelight receiving module 20 may cause the change of the series current flowing through the series circuit of thelight receiving module 20 and the current limitingmodule 60. Theprocessor 30 collects the series current of the series circuit of thelight receiving module 20 and the current limitingmodule 60, and looks up the contamination degree corresponding to the series current according to a current and contamination degree comparison table, wherein the current and contamination degree comparison table is the corresponding relationship between the series current and the contamination degree of the object surface, and the current and contamination degree comparison table is described in two cases as follows:
in the first case: when the resistance value of thelight receiving module 20 is inversely proportional to the received light intensity, if the series current of the series circuit of thelight receiving module 20 and the current limitingmodule 60 is smaller, the resistance of thelight receiving module 20 is larger, and further the received light intensity of thelight receiving module 20 is smaller, and further the degree of contamination is larger; if the series current of the series circuit of thelight receiving module 20 and the current limitingmodule 60 is larger, it means that the resistance of thelight receiving module 20 is smaller, and further means that the intensity of the received light of thelight receiving module 20 is larger, and further means that the degree of contamination is smaller.
In the second case: when the resistance value of thelight receiving module 20 is proportional to the intensity of the received light, if the series current of the series circuit of thelight receiving module 20 and the current limitingmodule 60 is smaller, it indicates that the resistance of thelight receiving module 20 is larger, and further indicates that the intensity of the received light of thelight receiving module 20 is larger, and further indicates that the degree of contamination is smaller; if the series current of the series circuit of thelight receiving module 20 and the current limitingmodule 60 is larger, it means that the resistance of thelight receiving module 20 is smaller, and further means that the intensity of the received light of thelight receiving module 20 is smaller, and further means that the degree of contamination is larger.
Alternatively, theprocessor 30 may collect the series current of thelight receiving module 20 through a current sampling circuit. The current and dirt degree comparison table is the corresponding relation between the series current and the dirt degree of the surface of the object, namely each series current has the corresponding dirt degree. The current and pollution degree comparison table is related to the preset illumination intensity and the distance between the light emittingmodule 10 and thelight receiving module 20, and different distances correspond to different current and pollution degree comparison tables under the same preset illumination intensity; when the distances are the same, different preset illumination intensities correspond to different current and pollution degree comparison tables. In the actual use process, the corresponding preset illumination intensity and distance can be selected after the current and pollution degree comparison table is selected; it is also possible to prepare a current and contamination level comparison table according to the preset illumination intensity and distance after thelight emitting module 10 and thelight receiving module 20 are installed. Alternatively, the current and pollution level look-up table is stored in theprocessor 30, or the current and pollution level look-up table is stored in a memory communicatively coupled to theprocessor 30.
This embodiment utilizes light to propagate the principle and establishes ties current-limiting principle, changeslight receiving module 20's resistance value through the influence that transparent soil pick-up pipe propagated to light, and then detects the dirty degree in object surface by establishing ties current-limiting, realizes the automated inspection of the dirty degree in object surface.
In a preferred embodiment, the cleaning device of the present embodiment includes the object surface contamination level detection apparatus as in the above-mentioned embodiment, and other structures of the cleaning device can refer to the prior art. Alternatively, the cleaning device may be a sweeping robot, a vacuum cleaner, a sweeper, or the like. The cleaning device of this embodiment utilizes the light to propagate the principle, detects the dirty degree in object surface through the influence of transparent soil pick-up pipe to the light is propagated, realizes the automated inspection of the dirty degree in object surface.
In some embodiments, the cleaning device stores a dirty degree and working parameter comparison table, and each dirty degree corresponds to a set working parameter. After the dirt degree is obtained, the dirt degree and the working parameter comparison table are searched to obtain the working parameter corresponding to the current dirt degree, the cleaning equipment automatically adjusts the equipment parameter to the current working parameter, and cleaning operation is carried out according to the adjusted working parameter. For example, when the degree of dirt is larger, the object surface is dirtied, and the working parameters need to be adjusted to increase the cleaning force; when the degree of dirt is smaller, the object surface is cleaner, and the working parameters need to be adjusted to reduce the sweeping force. The equipment that cleans of this embodiment can reach better cleaning effect according to dirty degree automatically regulated working parameter, can save the electric quantity again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor (30), or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.