CN113351586A - Laser for cleaning inner wall of tubular component - Google Patents
Laser for cleaning inner wall of tubular component Download PDFInfo
- Publication number
- CN113351586A CN113351586A CN202110572272.9A CN202110572272A CN113351586A CN 113351586 A CN113351586 A CN 113351586A CN 202110572272 A CN202110572272 A CN 202110572272A CN 113351586 A CN113351586 A CN 113351586A
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- CN
- China
- Prior art keywords
- laser
- cleaning
- wall
- tubular member
- transmission mirror
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
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, provided by the invention, 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 optical fibers or gratings (lens groups), so that linear scanning or surface scanning (plane) is realized, but when the inner wall of a tubular component is cleaned, the focal length of the lens groups needs to be continuously adjusted 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 groups is difficult to realize through a laser clamp at present, so that 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 existing laser on 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-emitting 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 assembly 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.
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 luminophores are ruby or titanium sapphire or YAG crystals.
In some embodiments, the pump source is a high voltage excitation module.
The laser for cleaning the inner wall of the tubular member provided by the invention has the beneficial effects that: compared with the prior art, the laser for cleaning the inner wall of the tubular member has the advantages that under the excitation action of the pumping source, the luminous body absorbs energy of ground state particles to transit 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 the transmission mirror and the 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 multiplied in the multiple reflection oscillation process of the transmission mirror and the total reflection mirror, the number of the high-energy level transition particles formed by the luminous body pumped by the pumping source is relatively reduced to form loss, meanwhile, the pumping source continuously pumps the luminous body to improve the number of the high-energy level particles to form gain until a threshold value is reached (the gain is more than or equal to the loss), thereby form effectual laser oscillation and jet out from the transmission mirror, because the transmission mirror is the semi-ring type, consequently the laser beam that jets out through the transmission mirror becomes fan-shaped, and because the lens subassembly vibrates the photon figure that has improved to the multiple reflection of photon, consequently can improve the energy density of fan-shaped laser beam, thereby satisfy the cleaning requirement, improve the cleaning performance, and only need move the laser instrument setting on the axis of tubulose member among the cleaning process, fan-shaped laser beam just can carry out the equivalent face to the inner wall of tubulose member and sweep the washing, thereby improve the cleaning efficiency.
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 schematic 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 are not intended to limit the invention.
Referring to fig. 1 to 3, a laser for cleaning an 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-emitting 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:
it should be noted that the stimulated radiation refers to a phenomenon that photons in an excited state are radiated when the photons are transited 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 atoms, and the frequency, the phase, the propagation direction and the polarization state of the photons emitted by the stimulated radiation are all the same as those of the external photons.
Photons spontaneously radiated by the luminophor 30 towards the periphery of the luminophor 30 are emitted to the transmission mirror 41 (the transmission rate is certain, and other photons except the photons emitted through the transmission mirror 41 are reflected) and are reflected back to the luminophor 30 on the total reflection mirror 42 (the reflected photons are used as external photons), the luminophor 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 luminophor 30 after one-time reflection is doubled, and because the transmission mirror 41 and the total reflection mirror 42 are in a structure form of butt joint rings, the photons can repeatedly vibrate and reflect among the lens components 40 for many 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 pump source 20, the number of the excited-state particles of the luminophor 30 is gradually increased to form a gain process, when the gain is greater than or equal to the loss, the effective laser oscillation is generated, and the effective laser oscillation can be formed in any radial direction of the lens assembly 40, so that the whole outer ring surface of the transmission mirror 41 can emit laser, and a fan-shaped laser beam is 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 emitter 30 needs to generate a larger number of excited-state particles under the pumping of the pumping 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, in the laser for cleaning the inner wall of the tubular member provided by this embodiment, when the light emitter 30 is excited by the pump source 20, the ground state particle absorbs energy and makes transition to the high-energy level particle, so as to realize the inversion of the number of particles, the light emitter 30 spontaneously radiates photons to the periphery thereof, and 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 photons generated by the light emitter 30 can be increased in multiples during the multiple reflection oscillation of the photons by the transmission mirror 41 and the total reflection mirror 42, so as to reduce the number of high-energy level transition particles and form loss, and meanwhile, the pump source 20 continuously pumps the light emitter 30 to increase the number of high-energy level particles, thereby forming gain, and forming effective laser oscillation and emitting from the transmission mirror 41 until the gain is equal to or greater than the loss, because the transmission mirror 41 is in a semi-ring shape, the laser beam emitted by the transmission mirror 41 is in a fan shape, and the number of photons is increased by the repeated reflection and oscillation of the lens assembly 40 on the photons, so that the energy density of the fan-shaped laser beam can be increased, the cleaning requirement is met, the cleaning effect is improved, and the fan-shaped laser beam can perform surface scanning cleaning on the inner wall of the tubular member only by arranging the laser device on the central axis of the tubular member to move in the cleaning process, so that the cleaning efficiency is improved.
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 when they are emitted to the transmission mirror 41, and therefore the more the number of reflection oscillation times of the photons between the lens assemblies 40, the more the photons generated by the excited light emitter 30 can be generated, and further the more the excited particles formed by pumping by the pump source 20, that is, the lower the light transmittance of the transmission mirror 41, the more the excited particles, the greater the energy density of the finally obtained laser, and when the inner wall of the tubular member is cleaned, the greater the inner diameter of the tubular member, the greater the energy density of the required laser beam, because the laser beam is emitted in a fan shape, the smaller the energy density of the end of the tubular member, and the larger the energy density of the required laser beam, for a conventional large-sized pipe (diameter 200-500 mm), the transmission mirror 41 with the light transmittance of less than 3% is selected.
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 assembly 40, a closed cavity and the resonant cavity 400 can be enclosed together, and photons emitted by the luminous body 30 to the outside of the lens assembly 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, because the dye in the 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 π 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 of pumping the illuminant 30 continuously by pumping, the excited state energy level particles are 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 pie-shaped piece of 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 the grey-blue welding slag on the inner wall of the pipe fitting is cleaned, the sapphire is adopted to generate blue laser beams; 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 only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A laser for cleaning the 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;
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 assembly 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;
and in the continuous pumping process of the pumping source, the luminophor is matched with the transmission mirror and the total reflection mirror to perform multiple reflection oscillation on the photons, so that a fan-shaped laser beam emitted by the transmission mirror is formed.
2. The laser for cleaning the inner wall of a tubular member according to claim 1, wherein said transmission mirror has a light transmittance of less than 3%.
3. The laser for cleaning inner wall of tubular member as claimed in claim 1, wherein said lens assembly is packaged with cover plates at two sides thereof, two said cover plates and said lens assembly together enclose a resonant cavity, and said light emitter is located in said resonant cavity.
4. The laser for cleaning the inner wall of a tubular member according to claim 3, wherein said cover plate is a glass plate.
5. A laser for cleaning the inner wall of a tubular member according to claim 3, wherein a Q-switch is provided in said resonator.
6. The laser for cleaning inner wall of tubular member according to claim 5, wherein said Q-switch is a dye cartridge disposed between said transmission mirror and said light emitter.
7. The laser for cleaning the inner wall of a tubular member according to claim 6, wherein said cartridge is of a half-ring type.
8. The laser for cleaning the inner wall of a tubular member according to any one of claims 1 to 7, wherein said light-emitting body is of a disk shape, and said fixed shaft is connected to the center of said light-emitting body.
9. The laser for cleaning the inner wall of a tubular member according to claim 8, wherein said light-emitting body is a ruby or titanium sapphire or YAG crystal.
10. The laser for cleaning the inner wall of a tubular member according to any one of claims 1 to 7, wherein the pump source is a high-voltage excitation module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
|---|---|---|---|
| CN202110572272.9A CN113351586B (en) | 2021-05-25 | 2021-05-25 | Laser for cleaning inner wall of tubular component |
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| CN113351586A true CN113351586A (en) | 2021-09-07 |
| CN113351586B CN113351586B (en) | 2023-03-17 |
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| 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 |
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| FR2689423A1 (en) * | 1992-04-01 | 1993-10-08 | Valinox | Cleaning device for cleaning interior surfaces of esp. metallic tubes - uses laser beam which is aimed at inside surface of tube by rotating mirror driven by rotor fitted with blades which turn under influence of stream of gas. |
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| CN113351586B (en) | 2023-03-17 |
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