CN113351586B - Laser for cleaning inner wall of tubular component - Google Patents
Laser for cleaning inner wall of tubular component Download PDFInfo
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- CN113351586B CN113351586B CN202110572272.9A CN202110572272A CN113351586B CN 113351586 B CN113351586 B CN 113351586B CN 202110572272 A CN202110572272 A CN 202110572272A CN 113351586 B CN113351586 B CN 113351586B
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- Prior art keywords
- laser
- cleaning
- wall
- tubular member
- transmission mirror
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
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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
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
- B08B7/0042—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like by laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
- H01S3/094015—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre with pump light recycling, i.e. with reinjection of the unused pump light back into the fiber, e.g. by reflectors or circulators
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Mechanical Engineering (AREA)
- Lasers (AREA)
Abstract
The invention provides a laser for cleaning the inner wall of a tubular member, which comprises a shell, a pumping source, a luminous body and a lens component, wherein the shell is provided with a plurality of holes; the side wall of the shell is provided with a light outlet notch; the pumping source is arranged in the shell, and one end of the pumping source is provided with a fixed shaft; the luminous body is connected with the fixed shaft and is used for spontaneously radiating photons to the periphery of the luminous body; the lens component comprises a semi-annular transmission mirror and a total reflection mirror, the transmission mirror and the total reflection mirror are butted into a ring and sleeved on the periphery of the luminous body, and the position of the transmission mirror corresponds to the light outlet notch; the luminophor is matched with the transmission mirror and the total reflection mirror to reflect and vibrate photons for multiple times in the continuous pumping process of the pumping source, so that a fan-shaped laser beam emitted by the transmission mirror is formed. The laser for cleaning the inner wall of the tubular member can emit fan-shaped laser beams, is suitable for cleaning the inner wall of the tubular member and improves the cleaning efficiency.
Description
Technical Field
The invention belongs to the technical field of laser cleaning, and particularly relates to a laser for cleaning the inner wall of a tubular member.
Background
At present, with the continuous development of laser technology, the surface cleaning work of mechanical parts begins to adopt a laser cleaning mode to replace the traditional cleaning means. The laser cleaning belongs to non-contact cleaning, and impurity elements cannot be introduced. Most of the existing lasers emit laser beams along the axial direction of a luminous body (such as a ruby rod), in order to improve the cleaning efficiency, the laser beams are generally transmitted through an optical fiber or a grating (a lens group) so as to realize line scanning or surface scanning (plane), but when the inner wall of a tubular component is cleaned, the focal length of the lens group needs to be continuously adjusted so as to enable the effective cleaning wave band of the laser beams to be scanned on the cleaning surface, and the accurate adjustment of the focal length of the lens group is difficult to realize through a laser clamp at present, so the cleaning effect on the tubular component is not ideal, and the cleaning efficiency is low.
Disclosure of Invention
The embodiment of the invention provides a laser for cleaning the inner wall of a tubular member, and aims to solve the problems of poor cleaning effect and low cleaning efficiency of the conventional laser for the inner wall of the tubular member.
In order to achieve the purpose, the invention adopts the technical scheme that: provided is a laser for cleaning the inner wall of a tubular member, comprising:
the side wall of the shell is provided with a light outlet notch;
the pumping source is arranged in the shell, and one end of the pumping source is provided with a fixed shaft;
a luminous body connected with the fixed shaft and used for spontaneously radiating photons to the periphery of the luminous body;
the lens assembly comprises a semi-annular transmission mirror and a total reflection mirror, the transmission mirror and the total reflection mirror are in butt joint to form a ring and are sleeved on the periphery of the luminous body, and the position of the transmission mirror corresponds to the light outlet notch;
the luminophor is matched with the transmission mirror and the total reflection mirror to reflect and vibrate photons for multiple times in the continuous pumping process of the pumping source, so that a fan-shaped laser beam emitted by the transmission mirror is formed.
In one possible implementation, the transmission of light through the mirror is less than 3%.
In a possible implementation manner, cover plates are respectively packaged at two sides of the lens component, the two cover plates and the lens component jointly enclose a resonant cavity, and the luminous body is located in the resonant cavity.
In some embodiments, the cover plate is a glass plate.
In some embodiments, a Q-switch is disposed within the resonant cavity.
For example, the Q-switch is a cartridge disposed between the transmission mirror and the illuminant.
In particular, the cartridge is of a half-ring type.
In one possible implementation, the luminous body is in a shape of a circular cake, and the fixed shaft is connected with the center of the luminous body.
In some embodiments, the luminophor is ruby or titanium sapphire or YAG crystal.
In some embodiments, the pump source is a high voltage excitation module.
The laser for cleaning the inner wall of the tubular member has the advantages that: compared with the prior art, the laser for cleaning the inner wall of the tubular member is characterized in that under the excitation action of a pump source, a luminous body absorbs energy of ground state particles to jump to high-energy-level ions to realize population inversion, the luminous body spontaneously radiates photons to the periphery of the luminous body, when the photons pass through the luminous body again under the reflection action of a transmission mirror and a total reflection mirror, the luminous body radiates another photon with the same energy as the photon under the excitation radiation theory, so that the number of the photons generated by the luminous body can be increased exponentially in the multi-reflection oscillation process of a transmission mirror and the total reflection mirror, the number of the high-energy-level jumping particles formed by pumping the luminous body by the pump source is relatively reduced to form loss, meanwhile, the pump source continuously pumps the luminous body to improve the number of the high-energy-level particles to form gain until the threshold value (the gain is more than or equal to the loss) is reached, effective laser oscillation is formed and emitted from the transmission mirror, because the transmission mirror is of a semi-ring type, a laser beam emitted by the transmission mirror is in a fan shape, and because the multi-reflection oscillation of the lens component on the lens component to improve the number of the photons, the energy density of the fan-shaped laser beam, thereby meeting the cleaning requirements, the cleaning effect, and the cleaning efficiency of the tubular member can be improved only by arranging the cleaning efficiency of the inner wall of the tubular member on the axis of the tubular member in the cleaning process.
Drawings
Fig. 1 is a schematic structural diagram of a laser for cleaning an inner wall of a tubular member according to an embodiment of the present invention;
FIG. 2 is a perspective view of a lens assembly used in an embodiment of the present invention;
fig. 3 is a schematic diagram of an optical path of a lens assembly employed in an embodiment of the present invention.
In the figure: 10. a housing; 100. a light exit slot; 20. a pump source; 200. a fixed shaft; 30. a light emitter; 40. a lens assembly; 400. a resonant cavity; 41. a transmission mirror; 42. a total reflection mirror; 43. a cover plate; 50. a dye box.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, 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 do not limit the invention.
Referring to fig. 1 to 3, a laser for cleaning the inner wall of a tubular member according to the present invention will be described. The laser for cleaning the inner wall of the tubular member comprises a shell 10, a pumping source 20, a luminous body 30 and a lens assembly 40; the side wall of the shell 10 is provided with a light outlet notch 100; the pumping source 20 is arranged in the shell 10, and one end of the pumping source is provided with a fixed shaft 200; the luminous body 30 is connected to the fixed shaft 200 for spontaneously radiating photons to the periphery thereof; the lens assembly 40 includes a semi-ring-shaped transmission mirror 41 and a total reflection mirror 42, the transmission mirror 41 and the total reflection mirror 42 are butted to form a ring and are sleeved on the periphery of the light emitter 30, and the position of the transmission mirror 41 corresponds to the light exit notch 100; in the continuous pumping process of the pump source 20, the light emitter 30 cooperates with the transmission mirror 41 and the total reflection mirror 42 to perform multiple reflection oscillation on photons, so as to form a fan-shaped laser beam emitted from the transmission mirror 41.
It should be noted that the pump source 20 is used to excite the laser working substance and pump the excited particles from the ground state to a high energy level to achieve the population inversion, and different excitation modes and excitation devices, such as optical excitation pump, electrical excitation pump, chemical excitation pump, may be adopted according to the working substance and the operating conditions of the laser, and the light emitter 30, i.e. the laser working substance, is used to emit photons spontaneously or by excitation, and the direction of the emitted photons is not fixed, but emits photons in any direction of the peripheral space, and of course, in this embodiment, the effective photons only consist in the photons emitted toward the lens assembly 40.
The working principle of the laser for cleaning the inner wall of the tubular member provided by the embodiment is as follows:
first, it should be noted that the stimulated radiation refers to a phenomenon that a photon in an excited state radiates a photon when the photon transits to a low energy state or a ground state under the action of an external radiation field, the energy of the external radiation must be just the energy difference between two energy levels of an atom, and the frequency, phase, propagation direction and polarization state of the photon emitted by the stimulated radiation and the external photon are all the same.
Photons spontaneously radiated by the luminous body 30 towards the periphery of the luminous body 30 are emitted to the transmission mirror 41 (the transmission rate is certain, and the rest photons except the photons emitted through the transmission mirror 41 are reflected) and are reflected back to the luminous body 30 on the total reflection mirror 42 (the reflected photons are used as external photons), the luminous body 30 emits another photon which is the same as the external photons under the effect of the stimulated radiation theory, so the number of the photons passing through the luminous body 30 after one-time reflection is doubled, and because the transmission mirror 41 and the total reflection mirror 42 are in a butt-joint ring structure form, the photons can repeatedly oscillate and reflect among the lens assemblies 40 for a plurality of times, so that the number of the photons is exponentially increased, the number of excited-state particles is relatively reduced to form loss, and simultaneously under the continuous pumping action of the pumping source 20, the number of the excited-state particles of the luminous body 30 is gradually increased to form a gain process, when the gain is greater than or equal to the loss, effective laser oscillation is generated, and effective laser oscillation can be formed in any radial direction of the lens assemblies 40, so that the whole outer ring surface of the transmission mirror 41 can emit laser beams, and fan-shaped laser beams are formed; it should be understood that, since the number of photons is exponentially increased by the repeated reflection oscillation of the lens assembly 40 to the photons, the light emitting body 30 needs to generate a larger number of excited-state particles under the pumping of the pump source 20, that is, the finally obtained laser energy density is exponentially amplified multiple times, so as to ensure that the entire fan-shaped laser beam can meet the requirement of the cleaning operation.
Compared with the prior art, the laser for cleaning the inner wall of the tubular member provided by the embodiment, when the light emitter 30 is excited by the pump source 20, the ground state particles absorb energy and transit to the high-energy-level particles, so that the particle number is reversed, the light emitter 30 spontaneously radiates photons to the periphery of the light emitter 30, the photons pass through the light emitter 30 again under the reflection action of the transmission mirror 41 and the total reflection mirror 42, the light emitter 30 radiates another photon with the same energy as the photon under the stimulated radiation theory, so that the number of the photons generated by the light emitter 30 can be increased in multiples during the multiple reflection oscillation process of the photons on the transmission mirror 41 and the total reflection mirror 42, further the number of the high-energy-level transit particles is reduced, loss is formed, meanwhile, the pump source 20 continuously pumps the light emitter 30 to increase the number of the high-energy-level particles, gain is formed, effective laser oscillation is formed when the gain is greater than or equal to the loss and reaches the threshold value, the photons are emitted from the transmission mirror 41, because the transmission mirror 41 is of a semi-ring type, the laser beam emitted through the transmission mirror 41 becomes a fan-shaped, and the cleaning effect is improved only by arranging the cleaning line of the tubular member in the cleaning process, thereby improving the efficiency of the cleaning the tubular member.
In one possible implementation, the transmittance of the transmission mirror 41 is less than 3%. The lower the light transmittance of the transmission mirror 41, the higher the reflection probability of the photons emitted to the transmission mirror 41, and therefore the more the number of reflection oscillations of the photons between the lens assemblies 40, the more the photons generated by the excited emitter 30 can be, and further the more the number of excited-state particles formed by pumping by the pump source 20, that is, the lower the light transmittance of the transmission mirror 41, the more the number of excited-state particles, the larger the laser energy density finally obtained, and when the inner wall of the tubular member is cleaned, the larger the inner diameter of the tubular member is, the larger the required laser energy density is, and for a conventional large-size pipe (diameter 200-500 mm), the cleaning requirement can be satisfied by selecting the transmission mirror 41 having a light transmittance of less than 3%.
In one possible implementation manner, referring to fig. 1 and fig. 2, two cover plates 43 are respectively packaged on two sides of the lens assembly 40, the two cover plates 43 and the lens assembly 40 jointly enclose a resonant cavity 400, and the light emitter 30 is located in the resonant cavity 400. Specifically, the cover plate 43 may be preferably made of a glass plate. Through the two glass plates and the lens component 40, a closed cavity and the resonant cavity 400 can be enclosed together, and photons emitted by the illuminant 30 to the outside of the lens component 40 can be absorbed by the resonant cavity 400 and the two glass plates, so that the photon energy is prevented from leaking to the outside air.
In some embodiments, referring to fig. 1 and 2, a Q-switch (giant pulse generator) is disposed in the resonant cavity 400. For example, the Q-switch may be a half-ring type cartridge 50 disposed between the transmission mirror 41 and the illuminant 30.
Most of the time of pumping excitation, since the dye in the dye cartridge 50 absorbs the photons emitted to the transmission mirror 41, the loss in the resonant cavity 400 is large, the Q value (i.e., the energy stored in the resonant cavity 400/the energy lost per second, Q =2 pi v, v is the photon oscillation frequency in the resonant cavity 400) is low, the pumping gain is smaller than the loss, laser oscillation cannot be formed, in the process that the pump continuously pumps the light emitting body 30, excited state energy level particles are continuously accumulated, and after the number of excited state photons reaches the dye absorption limit, the dye is bleached, the loss is reduced, the Q value is increased, and thus effective laser oscillation is formed. The dye box 50 is added, so that the effective laser oscillation time can be reduced, and the laser peak power can be improved, thereby improving the energy density of laser beams and improving the cleaning effect.
In one possible implementation, referring to fig. 1, the light emitter 30 is a round-cake-shaped ruby or titanium sapphire or YAG crystal (yttrium aluminum garnet), and the fixed shaft 200 is connected to the center of the light emitter 30. The method comprises the following steps that ruby, titanium sapphire or YAG crystals are adopted to respectively generate laser beams with different wave bands, the laser beams with the wave bands can respectively meet different cleaning requirements, for example, red paint on the inner wall of the pipe fitting is removed, the ruby or YAG crystals are adopted to generate red laser beams which can be specially removed aiming at haematochrome, and when a welding seam of grey-sapphire welding slag on the inner wall of the pipe fitting is cleaned, blue laser beams can be generated by adopting sapphire; in addition, since the light emitter 30 is of a disk shape, the peripheral wall thereof can correspond to the inner annular surface of the lens assembly 40, thereby ensuring that the number of photons emitted to each position of the lens assembly 40 is uniform, ensuring that the energy density of the laser beam emitted by the final transmission mirror 41 is uniform at each radial angle of the fan shape thereof, and improving the cleaning effect.
In one possible implementation, pump source 20 is a high voltage excitation module. The high-voltage excitation module is adopted as the pumping source 20, so that the excitation energy of the luminous body 30 can be flexibly controlled, and the finally obtained energy density of the laser beam is controlled to adapt to the cleaning work of tubular members with different inner diameters.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (8)
1. A laser for cleaning an inner wall of a tubular member, comprising:
the side wall of the shell is provided with a light-emitting notch;
the pumping source is arranged in the shell, and one end of the pumping source is provided with a fixed shaft;
a luminous body connected with the fixed shaft and used for spontaneously radiating photons to the periphery of the luminous body;
the lens assembly comprises a semi-annular transmission mirror and a total reflection mirror, the light transmittance of the transmission mirror is less than 3%, the transmission mirror and the total reflection mirror are in butt joint to form a ring and are sleeved on the periphery of the luminous body, and the position of the transmission mirror corresponds to the light outlet notch;
in the continuous pumping process of the pumping source, the luminophor is matched with the transmission mirror and the total reflection mirror to perform multi-reflection oscillation on the photons, so that a fan-shaped laser beam emitted by the transmission mirror is formed;
cover plates are respectively packaged on two sides of the lens component, the two cover plates and the lens component jointly enclose a resonant cavity, and the luminous body is located in the resonant cavity.
2. The laser for cleaning the inner wall of a tubular member according to claim 1, wherein said cover plate is a glass plate.
3. The laser for cleaning the inner wall of a tubular member according to claim 1, wherein a Q-switch is provided in said resonator.
4. The laser for cleaning the inner wall of a tubular member according to claim 3, wherein said Q-switch is a dye cartridge provided between said transmission mirror and said light emitter.
5. The laser for cleaning inner wall of tubular member according to claim 4, wherein said cartridge is of semi-ring type.
6. A laser for cleaning the inner surface of a tubular member according to any one of claims 1 to 5, wherein said light-emitting body is of a disk shape, and said fixed shaft is connected to the center of said light-emitting body.
7. The laser for cleaning the inner wall of a tubular member according to claim 6, wherein said light-emitting body is a ruby or titanium sapphire or YAG crystal.
8. The laser for cleaning the inner wall of a tubular member according to any one of claims 1 to 5, wherein the pump source is a high-voltage excitation module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110572272.9A CN113351586B (en) | 2021-05-25 | 2021-05-25 | Laser for cleaning inner wall of tubular component |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110572272.9A CN113351586B (en) | 2021-05-25 | 2021-05-25 | Laser for cleaning inner wall of tubular component |
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| CN113351586A CN113351586A (en) | 2021-09-07 |
| CN113351586B true CN113351586B (en) | 2023-03-17 |
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| CN117531126A (en) * | 2023-04-24 | 2024-02-09 | 汕头市东恒电子科技有限公司 | Laser beauty device for changing red eyebrow |
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| US4327337A (en) * | 1980-01-03 | 1982-04-27 | General Electric Company | Intracavity raman frequency conversion in a high power laser |
| CN87214068U (en) * | 1987-10-10 | 1988-09-07 | 清华大学 | Miniature internal chamber raman frequency-shift laser |
| FR2689423B1 (en) * | 1992-04-01 | 1995-09-01 | Valinox | DEVICE AND METHOD FOR LASER BEAM CLEANING OF THE INTERNAL WALL OF TUBES. |
| JP2002022089A (en) * | 2000-07-10 | 2002-01-23 | Toshiba Corp | Pipe inside inspection and repair device |
| CN1328831C (en) * | 2005-02-02 | 2007-07-25 | 中国科学院物理研究所 | Active and passive Q-adjusted single longitudinal mode laser |
| CN102886364A (en) * | 2012-10-23 | 2013-01-23 | 中国船舶重工集团公司第七一七研究所 | Portable-type laser cleaning head |
| CN204290023U (en) * | 2014-12-12 | 2015-04-22 | 中国工程物理研究院应用电子学研究所 | Infrared intra-cavity optical parametric oscillator during a kind of miniaturized wide spectral is tunable |
| CN204809628U (en) * | 2015-06-19 | 2015-11-25 | 深圳联品激光技术有限公司 | Laser |
| CN105750273B (en) * | 2016-04-21 | 2018-06-12 | 华中科技大学 | A kind of pipeline laser cleaner based on curved face total reflection mirror |
| CN110265862A (en) * | 2019-07-10 | 2019-09-20 | 长春新产业光电技术有限公司 | A kind of laser of high light beam quality |
| CN112170388A (en) * | 2020-11-05 | 2021-01-05 | 张旭斌 | Pipeline laser cleaning device based on mechanical automation |
| CN112436373A (en) * | 2020-11-30 | 2021-03-02 | 中国工程物理研究院应用电子学研究所 | Diode laser direct pumping micro intermediate infrared self-optical parametric oscillator |
| CN112742800A (en) * | 2020-12-23 | 2021-05-04 | 济南春博激光科技有限公司 | Device, equipment and method for adjusting beam angle applied to laser cleaning head |
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