CN112317450A - Ultrasonic fixed-point cleaning device and method based on photoacoustic jet flow effect - Google Patents
Ultrasonic fixed-point cleaning device and method based on photoacoustic jet flow effect Download PDFInfo
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- CN112317450A CN112317450A CN202011164031.2A CN202011164031A CN112317450A CN 112317450 A CN112317450 A CN 112317450A CN 202011164031 A CN202011164031 A CN 202011164031A CN 112317450 A CN112317450 A CN 112317450A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
Abstract
The invention discloses an ultrasonic fixed-point cleaning device and method based on a photoacoustic jet flow effect, which are used for solving the problems of difficulty in cleaning devices with complex structures such as small-sized precise elements and jewelry and cavitation corrosion in the cleaning process. A nanosecond pulse laser with the output wavelength of 532nm is coupled into a quartz optical fiber through a coupling lens after light splitting, the tail end of the optical fiber is of a concave cavity structure attached with gold nanoparticles, and the optical fiber is of a self-focusing photoacoustic transducer structure with strong directivity, and can form jet flow in ultrasonic cleaning liquid to clean dirt at a specific position at a fixed point. The optical fiber endoscope is combined with the quartz optical fiber, so that the specific cleaning in the visible state inside the device can be realized; meanwhile, the cleaning device can perform two-dimensional scanning cleaning on structures such as a long and thin groove, a micro ladder and the like through a motion control system; by utilizing the photoacoustic transduction structure based on the optical fiber element, the device with the small complex structure can be cleaned accurately and efficiently without dead angles, the cleaning time can be accurately controlled, and cavitation corrosion is avoided.
Description
Technical Field
The invention relates to the field of ultrasonic cleaning based on a photoacoustic effect, in particular to an ultrasonic fixed-point cleaning device and method based on the photoacoustic jet effect.
Background
The ultrasonic wave refers to sound wave with frequency higher than 20000Hz, and has the characteristics of strong penetrating power and easy transmission in water. When the sound pressure of ultrasonic vibration propagation reaches certain degree in the liquid, can produce the cavitation phenomenon, make the microbubble in the liquid keep vibrating, destroy the dirt of object surface adsorption, make the dirt layer refute from, reach the effect of washing the object. The ultrasonic cleaning technology has the advantages of high cleaning efficiency, good cleaning effect, labor saving and the like, and is widely applied to industries such as machinery, electronics and the like.
At present, the ultrasonic cleaning technology is developed rapidly and applied widely, but still has many problems. On one hand, the traditional ultrasonic cleaning machine generally carries out long-time integral cleaning on the device because a cleaning tank is matched with a corresponding transducer array, and in the ultrasonic cleaning process, the device is always under the high-power-density cleaning of stronger sound pressure, so that the cavitation corrosion on the surface of an object can be generated, and the traditional ultrasonic cleaning machine is not suitable for cleaning the device with a precise and high-finish surface; on the other hand, the whole cleaning process cannot monitor the cleaning result in real time, and the problems of residual dirt caused by insufficient cleaning or device damage caused by excessive cleaning and the like easily occur.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an ultrasonic fixed-point cleaning device and method based on a photoacoustic jet effect, which can be used for solving the problem of accurately cleaning small devices with complex structures. The main working process is that pulse laser is coupled into quartz optical fibers after being split by a spectroscope, and nanosecond pulse laser excites nano gold particles attached to the tail ends of the optical fibers to resonate to generate ultrasonic waves; due to the self-focusing property of the concave cavity structure, the ultrasonic waves have higher sound pressure at a specific position, the surface of an object can be effectively cleaned through a cavitation effect, and meanwhile, dirt can be quickly washed away by driving the ultrasonic cleaning liquid to form jet flow through the self-focusing ultrasonic waves, so that a better cleaning effect is achieved; the motion control system controls the position of the cleaning device to move, the object specific structure can be scanned and cleaned, the optical fiber endoscope is adopted to monitor the cleaning result, and meanwhile, the cleaning device can go deep into the device to clean.
The purpose of the invention is realized by the following technical scheme:
an ultrasonic fixed-point cleaning device based on a photoacoustic jet effect comprises a nanosecond pulse laser, a spectroscope, a lens, a quartz optical fiber, a translation support, a motion control system, a sleeve, an optical fiber endoscope and an endoscope monitor, wherein the spectroscope is arranged in front of the output end of the nanosecond pulse laser, laser emitted by the nanosecond pulse laser is divided into two branches through the spectroscope, the lens is arranged on each branch, the quartz optical fiber is arranged at the output end of the lens, and a self-focusing concave cavity structure is arranged at the tail end of the quartz optical fiber; the nano-gold particles are uniformly attached to the interior of the self-focusing concave cavity structure, the tail end of the quartz optical fiber is combined with one end of an optical fiber endoscope through a sleeve, the other end of the optical fiber endoscope is connected with an endoscope monitor, the sleeve is fixed on a translation support controlled by a motion control system and is immersed in ultrasonic cleaning liquid, and the motion control system is used for controlling and cleaning.
Further, when nanosecond pulse laser radiates the self-focusing concave cavity structure, the nano gold particles resonate to generate ultrasonic waves, and due to the concave cavity array distribution, sound pressure is intensively distributed near a focus, so that obvious jet flow can be generated in liquid.
Furthermore, the particle size of the nano gold particles is 40-60 nm.
Further, the laser wavelength output by the nanosecond pulse laser is 532nm, the pulse width is 50ns, the repetition frequency is 10kHz, and the average power of the nanosecond pulse laser is 400-800 mW.
Furthermore, when the focusing position of the lens is adjusted, the energy coupling coefficient of the pulse laser coupled into the quartz optical fiber is ensured to be larger than 0.5.
Furthermore, the quartz optical fiber is a multimode optical fiber with the diameter of a fiber core of 50-500 mu m.
Further, the optical fiber endoscope consists of a working hose, a quartz image fiber, an optical fiber and an LED, wherein the diameter of the working hose is 0.78mm, the quartz image fiber and the optical fiber are arranged in the working hose, the quartz image fiber is used for conducting images, the optical fiber is used for transmitting illuminating light, and the illuminating light is provided by the LED arranged at the rear end of the optical fiber endoscope; the depth of field of the optical fiber endoscope imaging is 2 mm-50 mm, the ocular magnification is 65 times, and the image element is 10000.
The invention also provides another technical scheme as follows:
an ultrasonic fixed-point cleaning method based on a photoacoustic jet effect comprises the following steps:
setting the output energy of a nanosecond pulse laser, adjusting the focusing position of a lens, and immersing the tail end of a quartz optical fiber into a nano gold particle solution;
turning on a nanosecond pulse laser, coupling the pulse laser into a quartz optical fiber through a lens, and forming an optical-acoustic transducer based on an optical fiber element due to the fact that a concave cavity structure attached with nano-gold particles is arranged at the tail end of the quartz optical fiber;
step three, turning off the nanosecond pulse laser, combining the tail end of the quartz optical fiber with the optical fiber endoscope through a sleeve, fixing the quartz optical fiber on a translation bracket controlled by a motion control system, and adjusting the position of the translation bracket to be immersed in the ultrasonic cleaning liquid;
placing the device to be cleaned at the sound pressure focus of the photoacoustic transducer, and setting a cleaning area in the motion control system according to the different structures of the cleaning device;
and fifthly, turning on the nanosecond pulse laser, operating the motion control system, enabling the nanogold particles to resonate to generate directional ultrasonic waves due to the irradiation of the nanosecond pulse laser, cleaning dirt on the surface of the device through a cavitation effect, simultaneously driving jet flow to wash away the dirt, monitoring a cleaning result through the optical fiber endoscope in the cleaning process, and realizing the accurate cleaning of the device with the complex structure.
Furthermore, for a device with a complex internal structure, the detachable motion control system can be directly cleaned by an ultrasonic cleaning probe which is formed by the quartz optical fiber and the optical fiber endoscope together to go deep into the device, so that no dead angle is left in cleaning.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the accuracy is high. The photoacoustic transduction structure formed by attaching the nano-gold particles to the concave cavity has good directivity, has high sound pressure only at a certain specific position, and can be used for pertinently cleaning structures which are easy to accumulate dirt, such as thin grooves, small holes and the like of devices.
2. The cleaning efficiency is high, the targeted cleaning is carried out on the region containing dirt, the problem that the traditional ultrasonic cleaning device can only carry out whole cleaning is avoided, and the targeted cleaning can be carried out on the part of the device with high cleaning requirement.
3. The reliability is strong. The cleaning device can be used for scanning and cleaning through the motion control system, can accurately control the cleaning time, reduces the action time of cavitation effect, avoids the problem of cavitation corrosion of objects due to long-time high-power-density cleaning, and can be applied to objects with precision and high surface smoothness.
4. The cleaning mode is more flexible. On one hand, the cleaning device can be separated from a specific ultrasonic cleaning tank to clean small devices at fixed points; on the other hand, the cleaning device can be combined with a fiber endoscope to clean invisible internal structures and monitor the cleaning process.
5. The generated ultrasonic wave has high frequency. Ultrasonic waves generated by the photoacoustic effect are generally high-frequency ultrasonic waves at MHz, have high directivity, and can clean precision mechanisms, such as chip substrates, whose substrates are fragile.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention and the cleaning state.
FIG. 2 is a schematic diagram of the optical path at the end of the silica fiber according to the present invention.
Fig. 3 is a combined structure diagram of the optical fiber endoscope and the optical fiber photoacoustic transducer according to the present invention.
Reference numerals: 1-nanosecond pulse laser, 2-spectroscope, 3-lens, 4-quartz fiber, 5-translation support, 6-sleeve and 7-fiber endoscope.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 3, the present invention provides an ultrasonic fixed-point cleaning device based on a photoacoustic jet effect, which includes a nanosecond pulse laser 1, a spectroscope 2, a lens 3, a quartz optical fiber 4, a translation support 5, a motion control system, a sleeve 6, an optical fiber endoscope 7 and an endoscope monitor, wherein the spectroscope 2 is arranged in front of an output end of the nanosecond pulse laser 1, laser emitted from the nanosecond pulse laser 1 is divided into two branches by the spectroscope 2, the lens 3 is arranged on each branch, the quartz optical fiber 4 is arranged at an output end of the lens 3, and a self-focusing cavity structure is arranged at a tail end of the quartz optical fiber 4; the nano gold particles are uniformly attached to the interior of the self-focusing concave cavity structure, the tail end of the quartz optical fiber is combined with one end of an optical fiber endoscope through a sleeve 6, the other end of the optical fiber endoscope is connected with an endoscope monitor, the sleeve 6 is fixed on a translation support 5 controlled by a motion control system and is immersed in ultrasonic cleaning liquid, and the control and the cleaning are carried out through the motion control system.
This embodiment shows a group of specific ultrasonic fixed-point cleaning device components and their structural dimensions:
the model of the quartz fiber is 105/125Low NA Launch fiber, based on the all-quartz fiber structure, the standard core diameter of 105um and the cladding diameter of 125um, and the double-acrylate coating layer is easy to peel off.
The nano-gold particle solution selects nano-gold particles with the particle diameter of 50nm, the nano-gold particles are ablated and attached in the concave cavity of the quartz optical fiber in the nano-gold ball particle solution with the concentration of 0.05mg/ml, and the corresponding nano-gold particle absorption peak is positioned at the position of 535 nm.
The optical fiber endoscope is a flexible optical fiber endoscope, and adopts superfine optical fibers with the diameter of 0.78mm, the length of 125mm and the observation distance of 5-10 mm. The quartz image fiber and the light guide fiber are arranged in the working hose, the quartz image fiber conducts images, the light guide fiber transmits illuminating light, and the illuminating light is provided by the LED at the rear end. The depth of field of the optical fiber endoscope imaging is 2 mm-50 mm, the ocular magnification is 65 times, and the image element is 10000.
Selecting a plano-convex lens with the diameter of 25.4m and the focal length of 100mm, wherein the size of a light spot at the focal point is less than hundred microns; when the focusing position of the lens is adjusted, the energy coupling coefficient of the pulse laser coupled into the quartz optical fiber is ensured to be larger than 0.5.
A spectroscope is selected as a plane mirror, a film with the transmittance of 532nm laser of 50 percent (45 degrees) is plated on the surface of the spectroscope, and the 532 laser can be divided into two vertical beams of light with the same power;
the nanosecond pulse laser outputs laser wavelength of 532nm, pulse width of 50ns, repetition frequency of 10kHz, and average power of 400-800 mW.
The specific implementation steps of cleaning by the ultrasonic fixed-point cleaning device are as follows:
the method comprises the following steps: setting the output energy of a nanosecond pulse laser, adjusting the focusing position of a lens, and immersing the tail end of the quartz fiber into the nano-gold particle solution.
Step two: and (3) turning on the nanosecond pulse laser, coupling the pulse laser into the quartz optical fiber through a lens, ablating the tail end of the optical fiber to generate a cavity structure due to higher laser power density, and attaching the gold nanoparticles to the surface of the cavity structure, thereby forming the optical-acoustic transducer based on the optical fiber element.
Step three: and (3) turning off the nanosecond pulse laser, combining the tail end of the quartz optical fiber with the optical fiber endoscope through a hard sleeve, fixing the quartz optical fiber on a translation bracket controlled by the motion control system, and adjusting the position of the quartz optical fiber to be immersed in the ultrasonic cleaning liquid.
Step four: and placing the device to be cleaned at the sound pressure focus of the photoacoustic transducer, and setting a cleaning area in the motion control system according to different structures of the cleaning device.
Step five: the nanosecond pulse laser is turned on, the motion control system is operated, the nano gold particles resonate to generate directional ultrasonic waves due to the radiation of the nanosecond pulse laser, dirt on the surface of the device is cleaned through a cavitation effect, meanwhile, jet flow is driven to wash away the dirt, the cleaning result is monitored through the optical fiber endoscope in the cleaning process, and the efficient and accurate cleaning of the device with the precise and complex structure is achieved.
In addition, for a device with a complex internal structure, the detachable motion control system can be directly cleaned by an ultrasonic cleaning probe which is formed by the quartz optical fiber and the optical fiber endoscope, and the ultrasonic cleaning probe can be deeply inserted into the device for cleaning, so that no dead angle is left in the cleaning process.
Therefore, the ultrasonic fixed-point cleaning device based on the photoacoustic jet effect can realize all-round cleaning of devices by adjusting the position of the optical fiber ultrasonic transducer, and can carry out whole-course monitoring through the optical fiber endoscope.
The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The ultrasonic fixed-point cleaning device based on the photoacoustic jet effect is characterized by comprising a nanosecond pulse laser (1), a spectroscope (2), a lens (3), a quartz optical fiber (4), a translation support (5), a motion control system, a sleeve (6), an optical fiber endoscope (7) and an endoscope monitor, wherein the spectroscope (2) is arranged in front of the output end of the nanosecond pulse laser (1), laser emitted by the nanosecond pulse laser (1) is divided into two branches through the spectroscope (2), the lens (3) is arranged on each branch, the quartz optical fiber (4) is arranged at the output end of the lens (3), and a self-focusing cavity structure is arranged at the tail end of the quartz optical fiber (4); the self-focusing ultrasonic endoscope is characterized in that nanogold particles are uniformly attached to the self-focusing concave cavity structure, the tail end of a quartz optical fiber (4) is combined with one end of an optical fiber endoscope (7) through a sleeve (6), the other end of the optical fiber endoscope (7) is connected with an endoscope monitor, the sleeve (6) is detachably mounted on a translation support (5) controlled by a motion control system and is immersed in ultrasonic cleaning liquid, and the control and cleaning are carried out through the motion control system.
2. An ultrasonic fixed-point cleaning device based on photoacoustic jet effect as claimed in claim 1, wherein when nanosecond pulsed laser irradiates the self-focusing cavity structure, the nano-gold particles resonate to generate ultrasonic waves, and due to the distribution of the cavity array, the sound pressure is concentrated near the focus, and a distinct jet can be generated in the liquid.
3. An ultrasonic spot cleaning apparatus based on photoacoustic jet effect according to claim 1, wherein the particle size of the gold nanoparticles is 40-60 nm.
4. An ultrasonic fixed-point cleaning device based on a photoacoustic jet effect according to claim 1, wherein the nanosecond pulse laser outputs a laser wavelength of 532nm, a pulse width of 50ns, a repetition frequency of 10kHz, and an average power of 400-800 mW.
5. An ultrasonic fixed-point cleaning device based on photoacoustic jet effect as set forth in claim 1, wherein the energy coupling coefficient of the pulsed laser coupled into the quartz fiber is ensured to be greater than 0.5 when the focusing position of the lens is adjusted.
6. An ultrasonic fixed-point cleaning device based on photoacoustic jet effect according to claim 1, wherein the silica fiber is a multimode fiber with a core diameter of 50-500 μm.
7. An ultrasonic fixed-point cleaning device based on photoacoustic jet effect according to claim 1, wherein the fiber optic endoscope is composed of a working hose with a diameter of 0.78mm, a quartz image fiber and a light guide fiber arranged inside, the quartz image fiber is used for conducting images, the light guide fiber is used for transmitting illumination light, and the illumination light is provided by the LED arranged at the rear end of the fiber optic endoscope; the depth of field of the optical fiber endoscope imaging is 2 mm-50 mm, the ocular magnification is 65 times, and the image element is 10000.
8. An ultrasonic fixed-point cleaning method based on a photoacoustic jet effect, the ultrasonic fixed-point cleaning apparatus according to claim 1, comprising:
setting the output energy of a nanosecond pulse laser, adjusting the focusing position of a lens, and immersing the tail end of a quartz optical fiber into a nano gold particle solution;
turning on a nanosecond pulse laser, coupling the pulse laser into a quartz optical fiber through a lens, and forming an optical-acoustic transducer based on an optical fiber element due to the fact that a concave cavity structure attached with nano-gold particles is arranged at the tail end of the quartz optical fiber;
step three, turning off the nanosecond pulse laser, combining the tail end of the quartz optical fiber with the optical fiber endoscope through a sleeve, fixing the quartz optical fiber on a translation bracket controlled by a motion control system, and adjusting the position of the translation bracket to be immersed in the ultrasonic cleaning liquid;
placing the device to be cleaned at the sound pressure focus of the photoacoustic transducer, and setting a cleaning area in the motion control system according to the different structures of the cleaning device;
and fifthly, turning on the nanosecond pulse laser, operating the motion control system, enabling the nanogold particles to resonate to generate directional ultrasonic waves due to the irradiation of the nanosecond pulse laser, cleaning dirt on the surface of the device through a cavitation effect, simultaneously driving jet flow to wash away the dirt, monitoring a cleaning result through the optical fiber endoscope in the cleaning process, and realizing the accurate cleaning of the device with the complex structure.
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| CN114515730A (en) * | 2022-01-20 | 2022-05-20 | 哈尔滨工程大学 | Method for carrying out underwater laser detonation cleaning based on tapered optical fiber |
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| CN114515730A (en) * | 2022-01-20 | 2022-05-20 | 哈尔滨工程大学 | Method for carrying out underwater laser detonation cleaning based on tapered optical fiber |
| CN114589158A (en) * | 2022-03-15 | 2022-06-07 | 广东工业大学 | Connecting rod laser cavitation composite ultrasonic cleaning device and cleaning method |
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