CN103191886B - Method for detecting surface pollution degree through ultrasonic wave and cleaning pollution - Google Patents

Abstract

The invention discloses a method for detecting and cleaning the degree of surface pollution by using ultrasonic waves. An ultrasonic transducer is used to emit and receive ultrasonic waves. When detecting the degree of pollution, the ultrasonic transducer emits surface acoustic waves with a frequency of F1, and the surface acoustic waves travel along After being propagated by the cleaned surface, it is received by the ultrasonic transducer. When the degree of pollution is different, the intensity of the surface acoustic wave received by the ultrasonic transducer will be different, and the intensity of the output electrical signal will also be different. When the electrical signal reaches the preset value, the ultrasonic The transducer emits ultrasonic waves with a frequency of F2 to clean the surface. After cleaning for a period of time, stop cleaning and test again; this method can continuously detect the degree of surface pollution, automatically clean according to the degree of pollution, keep the surface clean all the time, and reduce the damage to the surface. damage and save energy.

Description

A method for detecting and cleaning surface pollution degree by ultrasonic

technical field

The invention relates to a method for cleaning surfaces by using ultrasonic waves, in particular to a method for automatically cleaning surfaces by using ultrasonic waves according to the degree of surface pollution.

Background technique

During use, some objects will be polluted by the external environment to make the surface dirty, and the pollutants on the surface need to be continuously removed, such as car lights and car windows. Among the existing technologies, some technologies can only remove pollutants on the surface. For example, in the Chinese patent with the application number "02149762.1" and the title "Ultrasonic Cleaning Processor", a method for removing pollutants on the container wall is disclosed; some technologies Detecting pollutants on the surface, such as in the patent with the Chinese application number "200410033011" titled "Method and device for measuring surface pollutants in components in lithography devices", a radiation receiver is used to receive the pollutant radiation and according to the radiation Attributes to obtain the properties of pollutants to detect surface pollutants; in the Chinese patent application number "201010235705.3" titled "Using Ultrasonic and Sensors for Car Lamp Cleaning Device and Method", the detection of ambient temperature and humidity is used, and the This is based on the adoption of different solutions to maintain the cleanliness of the lamp surface.

The existing technology has the following disadvantages: it cannot be cleaned according to the degree of pollution, and sometimes it is cleaned without cleaning, resulting in excessive cleaning and affecting the service life; sometimes surface pollutants need to be cleaned but cannot be removed in time; There is still a lack of a method that can directly detect the degree of surface contamination, and use this as a basis to clean the surface, combine the detection technology with the cleaning technology, and effectively reduce the cost.

Therefore, it is necessary to urgently solve the above problems and provide a method for detecting the degree of surface contamination and automatically cleaning the surface based on this.

Contents of the invention

The invention discloses a method for detecting the degree of pollution on the surface of an object and automatically cleaning the pollutants on the surface of the object. The method first detects the degree of pollution on the surface, and then controls the cleaning of the surface according to the degree of pollution;

The method that the present invention adopts is:

The ultrasonic transducer is selected, and the ultrasonic transducer can convert the input electrical signal into mechanical vibration, thereby generating ultrasonic waves, and can also receive ultrasonic waves, convert ultrasonic waves into electrical signals, and output them to subsequent circuits;

Step 1. Detect the degree of pollution on the surface; the ultrasonic driver generates an electrical signal with a frequency of F1 and an intensity of A1, which drives the ultrasonic transducer to generate ultrasonic waves. The ultrasonic waves are transmitted along the surface of the object and are scattered by the pollutants after touching them Or absorption, the intensity of the ultrasonic wave reaching the ultrasonic transducer changes, and the ultrasonic transducer converts the ultrasonic wave into an electrical signal. When the degree of contamination on the surface of the object is different, the intensity of the generated electrical signal is also different. According to the intensity of the electrical signal, it is determined whether to clean and in what way to clean;

If cleaning is not required, go back to step 1 and continue to detect the degree of contamination on the surface of the object;

If it is determined to be cleaned, go to step 2 to detect whether there is liquid on the surface of the object. If there is no liquid, cover the surface of the object with liquid, and the ultrasonic driver generates an electrical signal with a frequency of F2 and an intensity of A2 to drive the ultrasonic transducer to generate ultrasonic waves. , to clean the surface of the object;

During cleaning or after cleaning, the ultrasonic transducer is used to receive the ultrasonic waves on the surface. When the signal strength output by the ultrasonic transducer reaches the preset value, it means that the object has been cleaned. Stop cleaning and return to step 1 to detect the object. degree of surface contamination;

There is at least one ultrasonic transducer; in order to reduce costs, a specific ultrasonic transducer can be used to generate ultrasonic waves in a part of the time and receive ultrasonic waves in another part of the time. When there are multiple ultrasonic waves of different frequencies , a specific ultrasonic transducer can receive and emit ultrasonic waves at the same time;

In order to reduce the cost, F1 can be equal to F2;

The beneficial effects of the present invention are: through the above scheme, the detection technology and the cleaning technology are combined together, and the cleaning is performed according to the degree of surface pollution, which can reduce the number of cleaning times, avoid excessive cleaning, and prolong the service life under the premise of ensuring cleaning; Since ultrasonic technology is used in detection and cleaning, the design can be simplified and the cost can be reduced.

Description of drawings

FIG. 1 is a schematic diagram of Embodiment 1 of the present invention.

Fig. 2 is a schematic diagram of Embodiment 2 of the present invention.

Fig. 3 is a schematic diagram of Embodiment 3 of the present invention.

In the figure: 1. Ultrasonic transducer, 2. Surface to be cleaned, 3. Water outlet and air outlet, 4. Solid baffle.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Figure 1 is an embodiment, in this embodiment, the surface to be cleaned is a square, the square is placed vertically, four ultrasonic transducers are located at the four corners, the water outlet is directly above the surface to be cleaned, and the ultrasonic transducer located in the upper left corner The transducer emits ultrasonic waves with a frequency of F1 to form surface acoustic waves. The surface acoustic waves propagate along the surface and are received by the other three ultrasonic transducers. The other three ultrasonic transducers are composite transducers that can receive frequency The surface acoustic wave of F1 can also emit ultrasonic waves with a frequency of F2. When the surface of the object is polluted, the intensity of the obtained surface acoustic wave will change, and the intensity of the electrical signal output by the three ultrasonic transducers will also change. , when the intensity drops below the threshold, open the water outlet to make the surface of the object wet, start the ultrasonic transducer to emit ultrasonic waves with a frequency of F2, and clean the surface of the object. After cleaning for a period of time, stop cleaning, blow out the air from the air outlet, remove the liquid on the surface, and use the ultrasonic wave with a frequency of F1 to detect again.

Since the directionality of the surface acoustic wave is relatively good, when the position of the pollutant changes, the intensity of the surface acoustic wave obtained by the three receiving ultrasonic transducers will change, and the intensity of the surface acoustic wave obtained by the ultrasonic transducer closest to the pollutant The change is most obvious. In the cleaning process, in order to achieve a better cleaning effect, the output power of the ultrasonic transducer is maximized.

In this example, F1 is 304.25MHZ, and F2 is 40KHZ.

Fig. 2 is the second embodiment, in this embodiment, the surface to be cleaned is placed vertically, the left side is a solid baffle plate, and a row of ultrasonic transducers are pasted on the right side, and the water outlet and the air outlet are on the surface to be cleaned. Above, the ultrasonic transducer is a composite transducer, which can not only emit and receive surface acoustic waves with frequency F1, but also receive ultrasonic waves with frequency F2. The ultrasonic transducer emits surface acoustic waves with frequency F1, and the surface acoustic wave Propagate along the surface of the object, and part of the surface acoustic wave propagates to the baffle and is reflected back. The reflected surface acoustic wave is received by the respective adjacent ultrasonic transducers. When the surface of the object is polluted, the sound received by the ultrasonic transducer The intensity of the surface wave will change, and the intensity of the electrical signal output by the ultrasonic transducer will also change accordingly. When the intensity drops to the preset value, the water outlet will be opened to make the surface of the object wet and the ultrasonic transducer will emit Ultrasonic waves with a frequency of F2 clean the surface of the object. After cleaning for a period of time, stop cleaning, and blow air from the blower port to remove the liquid on the surface of the object, and then use the surface acoustic wave with frequency F1 to detect again.

Fig. 3 is the 3rd embodiment, and in the present embodiment, cleaned surface is the inner surface of fish jar, and this fish jar is a cube, and two rows of ultrasonic transducers are placed on both sides of a surface of fish jar, and the working frequency of part ultrasonic transducer is F1, the working frequency of the other part is F2, a row of ultrasonic transducers emit surface acoustic waves, and the surface acoustic waves propagate along the surface and are received by another row of ultrasonic transducers. After the surface is polluted, the ultrasonic transducers receive The intensity of the surface acoustic wave will change, and the intensity of the electrical signal output by the ultrasonic wave will also change. When the intensity drops to the preset value, the ultrasonic transducer is driven to emit ultrasonic waves with a frequency of F2 to clean the surface. There are ultrasonic waves with frequency F1 and frequency F2. After cleaning for a period of time, the ultrasonic wave with frequency F2 is stopped, and only the surface acoustic wave with frequency F1 is detected.

In the above embodiments, only when the surface is highly polluted, high-power ultrasonic cleaning is used. In most cases, the ultrasonic power used for cleaning and detection is low, so energy can be saved, and surface dirt can be cleaned in time. In the case of excessive cleaning, avoid excessive cleaning to reduce damage to the surface caused by cavitation.

The present invention can be modified by those skilled in the art without departing from the spirit of the present invention, but the modifications are still within the protection scope of the claims of the present application.

Claims (2)

1. A method of utilizing ultrasonic waves to detect surface contamination and cleaning, characterized in that: The ultrasonic transducer is selected, and the ultrasonic transducer can convert the input electrical signal into mechanical vibration, thereby generating ultrasonic waves, and can also receive ultrasonic waves, convert ultrasonic waves into electrical signals, and output them to subsequent circuits; Step 1. Detect the degree of pollution on the surface; the ultrasonic driver generates an electrical signal with a frequency of F1 and an intensity of A1, which drives the ultrasonic transducer to generate ultrasonic waves. The ultrasonic waves are transmitted along the surface of the object and are scattered by the pollutants after touching them Or absorption, the intensity of the ultrasonic wave reaching the ultrasonic transducer changes, and the ultrasonic transducer converts the ultrasonic wave into an electrical signal. When the degree of contamination on the surface of the object is different, the intensity of the generated electrical signal is also different. According to the intensity of the electrical signal, it is determined whether to clean and in what way to clean; If cleaning is not required, go back to step 1 and continue to detect the degree of contamination on the surface of the object; If it is determined to be cleaned, go to step 2 to detect whether there is liquid on the surface of the object. If there is no liquid, cover the surface of the object with liquid, and the ultrasonic driver generates an electrical signal with a frequency of F2 and an intensity of A2 to drive the ultrasonic transducer to generate ultrasonic waves. , to clean the surface of the object; During cleaning or after cleaning, the ultrasonic transducer is used to receive the ultrasonic waves on the surface. When the signal strength output by the ultrasonic transducer reaches the preset value, it means that the object has been cleaned. Stop cleaning and return to step 1 to detect the object. degree of surface contamination. 2. A method for detecting and cleaning surface contamination by ultrasonic wave according to claim 1, characterized in that: said ultrasonic transducer has at least one.