CN214133123U - Device suitable for laser cleaning quality on-line monitoring - Google Patents
Device suitable for laser cleaning quality on-line monitoring Download PDFInfo
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- CN214133123U CN214133123U CN202021844128.3U CN202021844128U CN214133123U CN 214133123 U CN214133123 U CN 214133123U CN 202021844128 U CN202021844128 U CN 202021844128U CN 214133123 U CN214133123 U CN 214133123U
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Abstract
The utility model discloses a device suitable for laser cleaning quality on-line monitoring, including monitoring light source transmitter, monitoring light source receiver, monitoring light source transmitter includes that light source, light source shake mirror, first field lens, monitoring light source receiver includes second field lens, photoelectric sensor, signal processing apparatus, the light that the light source sent shakes mirror, first field lens to washing workpiece surface via the light source in proper order, receives via second field lens to photoelectric sensor after the reflexion again, photoelectric sensor is connected with the signal processing apparatus electricity. Through the difference of the reflectivity of the pollutants on the surface of the cleaning workpiece and the reflectivity of the base material on the surface of the cleaning workpiece, the signal processing device collects the intensity of the surface reflection light source of the cleaning workpiece after cleaning, and then compares the intensity of the surface reflection light source with the intensity of the reflection light of the cleaning workpiece in an uncontaminated state, so that the fixed-point and quantitative judgment on the cleaning quality can be realized.
Description
Technical Field
The utility model relates to a laser cleaning quality monitoring field, in particular to device suitable for laser cleaning quality on-line monitoring.
Background
The laser cleaning is developed based on the interaction of laser and substances, and compared with the traditional cleaning methods such as mechanical friction cleaning, chemical corrosion cleaning, liquid-solid strong impact cleaning, high-frequency ultrasonic cleaning and the like, the laser cleaning has the advantages of environmental friendliness, non-contact and accurate control, and is applied to various scenes at present, but the quality monitoring method after laser cleaning still has defects at present.
The Chinese utility model patent with application number 201811541117.5 and named as a method for detecting and online cleaning of table plate surface dirt and a device thereof transmits laser to the surface of an object to be detected through a special detection laser, and then reflects the laser to a detection signal receiving system so as to obtain corresponding reflected laser information to judge the cleaning quality. The application number is 201910206888.7, the name is a laser cleaning system and a method, the element composition and the layer thickness of a substance are judged through a spectrum, the analysis principle is complex, the processing data volume is large, the processing speed is low, and the purpose of real-time detection is difficult to achieve.
In conclusion, a new method is needed for cleaning quality monitoring, so as to solve the monitoring problem after laser cleaning.
Disclosure of Invention
The device suitable for online monitoring of the laser cleaning quality is simple in method and strong in operability, can realize real-time monitoring of laser cleaning on scenes with large reflectivity difference between pollutants on the surface of a cleaning workpiece and a cleaning workpiece substrate, especially on oil stains and paint pollutants on the surface of a metal material, can also be used for monitoring the cleaning quality of the pollutants on the surfaces of metals and non-metals made of different materials, and has a wide application range.
The utility model relates to a device suitable for the online monitoring of laser cleaning quality, which comprises a monitoring light source transmitter and a monitoring light source receiver,
the monitoring light source transmitter comprises a light source, a light source vibrating mirror and a first field lens, the monitoring light source receiver comprises a second field lens, a photoelectric sensor and a signal processing device, light emitted by the light source sequentially passes through the light source vibrating mirror and the first field lens to the surface of a cleaning workpiece, and is received by the photoelectric sensor through the second field lens after being reflected, and the photoelectric sensor is electrically connected with the signal processing device.
The cleaning device comprises a laser, a laser galvanometer, a third field lens and an XY axis platform, the cleaning workpiece is arranged on the XY axis platform, and laser emitted by the laser sequentially passes through the laser galvanometer and the third field lens to be cleaned and then is cleaned.
Furthermore, the monitoring light source receiver still includes the optical filter, the light that the light source sent via light source shakes the mirror, first field lens to washing workpiece surface in proper order, receives via optical filter, second field lens to photoelectric sensor after the reflexion again.
Specifically, the light source emits light with an incident angle of 30-60 ° to the surface of the workpiece to be cleaned.
Specifically, the signal processing device is electrically connected with the monitoring light source emitter, the laser cleaning device and the XY-axis platform, and is used for carrying out overall automatic control on the online monitoring device.
Furthermore, the focal length of the first field lens is 180-300mm, the breadth is 80-150mm, and the focal length of the second field lens is 180-300mm, the breadth is 100-200 mm.
Preferably, the focal length of the first field lens is 210mm, the breadth is 100mm, and the focal length of the second field lens is 210mm, the breadth is 150 mm.
The method for the online monitoring of the laser cleaning quality by the device comprises the following steps:
s1, establishing reflectivity relations of different pollutants on the surface of the cleaning workpiece and base materials on the surface of the cleaning workpiece to light sources with different wavelengths according to process experiment data, selecting the light source with the wavelength with large reflectivity difference (large difference of reflected light intensity) between the pollutants and the base materials as the light source, enabling the light emitted by the light source to pass through a light source vibrating mirror to the surface of the cleaning workpiece, receiving the light by a photoelectric sensor through a second field lens after the light is reflected, and reading light source signals received by the photoelectric sensor by a signal processing device;
s2, scanning the cleaned surface of the workpiece by the light source under the drive of the light source galvanometer, acquiring information of the surface of the workpiece scanned and cleaned by the light source in real time by the signal processing device, and calculating a light intensity distribution diagram of the workpiece; the information comprises the moment when the light source scans to the light spot on the surface of the cleaned workpiece, the specific position of the surface of the cleaned workpiece corresponding to the moment and the light intensity corresponding to the moment;
and S3, analyzing the light intensity distribution graph of the cleaning workpiece through the signal processing device, comparing the constructed light intensity distribution graph data of the cleaning workpiece with the standard reflected light intensity in the signal processing device, judging whether the conformity of the standard reflected light intensity and the non-polluted reflected light intensity of the substrate on the surface of the cleaning workpiece reaches a set value, and carrying out fixed-point and quantitative judgment on the cleaning quality.
Further, in step S1, the difference between the light intensity of the photo sensor reflected by the contaminant on the surface of the cleaned workpiece and the light intensity of the photo sensor reflected by the substrate on the surface of the cleaned workpiece is greater than 30%.
Furthermore, the light intensity of the pollutants on the surface of the cleaning workpiece and the light intensity of the substrate on the surface of the cleaning workpiece, which is reflected to the photoelectric sensor, are matched by selecting a light source with a proper wavelength.
Specifically, the matching method comprises the following steps: the test is carried out according to a single comparison principle, a light source with a proper wavelength is selected according to the reflectivity of the pollutants on the surface of the cleaning workpiece and the reflectivity of the base material of the cleaning workpiece, the difference value between the reflectivity of the pollutants on the surface of the cleaning workpiece and the reflectivity of the base material of the cleaning workpiece is larger than 30%, the light source emits light to be reflected to the photoelectric sensor to be received, and the reflected light intensity is in the receiving range of the photoelectric sensor.
Furthermore, before the cleaning quality of the surface of the cleaning workpiece is monitored, the surface of the cleaning workpiece is subjected to laser cleaning, the cleaning workpiece moves through the XY-axis platform, and the wavelength of the light source is different from the wavelength range adopted by the laser cleaning.
More specifically, the cleaning workpiece is made of one of aluminum alloy, copper, iron, titanium alloy and stainless steel.
Preferably, after step S3 is completed, the laser cleaning device is used to clean the residual contaminants on the surface of the workpiece again, and the laser beam with appropriate energy is used to clean the workpiece according to the determined fixed point and quantitative value, so as to avoid damage to the substrate of the workpiece under the condition of cleaning the contaminants.
The utility model relates to a device suitable for laser cleaning quality on-line monitoring's beneficial effect lies in:
1. the method is convenient and efficient, the signal processing device collects the intensity of the surface reflection light source of the cleaned workpiece through the difference of the reflectivity of the surface pollutant of the cleaned workpiece and the reflectivity of the surface base material of the cleaned workpiece, and then the intensity of the surface reflection light source is compared with the intensity of the reflection light of the uncontaminated state of the surface of the cleaned workpiece, so that the fixed-point and quantitative judgment on the cleaning quality can be realized.
2. The light source regulator is wide in application range, the wavelength of the light source is regulated through the light source regulator to obtain a proper light source, the difference between the pollutant on the surface of the cleaning workpiece and the reflected light intensity of the base material on the surface of the cleaning workpiece is guaranteed, the detection precision is improved, and the light source regulator is suitable for monitoring the surfaces of the cleaning workpieces made of different materials.
3. The utility model discloses an on-line monitoring device and method can be used to wash dynamic monitoring and the static monitoring of work piece, can be used to the real-time supervision of laser cleaning in-process, can be applicable to the static quality monitoring after finishing wasing again, can adapt to the use under the multiple scene, wherein static monitoring can avoid wasing the work piece motion in-process, and the vibration of wasing the work piece leads to the fact the interference to the degree of accuracy of photoelectric sensor received signal, further improves the detection precision.
Drawings
Fig. 1 is a schematic structural diagram of an online monitoring device suitable for laser cleaning quality.
1-laser cleaning device; 2-monitoring the light source emitter; 3-monitoring the light source receiver; 4-signal processing means; a 5-XY axis stage; 6-a light source; 7-light source galvanometer; 8-a first field lens; 9-laser galvanometer; 10-a third field lens; 11-a filter lens; 12-a second field lens; 13-photoelectric sensor.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
Example 1
As shown in FIG. 1, the device for online monitoring of laser cleaning quality of the present invention comprises a monitoring light source transmitter and a monitoring light source receiver,
the monitoring light source transmitter comprises a light source, a light source vibrating mirror and a first field lens, the monitoring light source receiver comprises a second field lens, a photoelectric sensor and a signal processing device, light emitted by the light source sequentially passes through the light source vibrating mirror and the first field lens to the surface of a cleaning workpiece, and is received by the photoelectric sensor through the second field lens after being reflected, and the photoelectric sensor is electrically connected with the signal processing device.
The cleaning device comprises a laser (not shown in the figure), a laser galvanometer, a third field lens and an XY axis platform, the cleaning workpiece is arranged on the XY axis platform, and laser emitted by the laser is sequentially subjected to laser cleaning from the laser galvanometer and the third field lens to the surface of the cleaning workpiece.
The monitoring light source receiver also comprises a filter lens, and light emitted by the light source sequentially passes through the light source vibrating mirror and the first field lens to the surface of the cleaning workpiece, and is reflected and then received by the photoelectric sensor through the filter lens and the second field lens.
The first field lens focuses light emitted by the light source in a cleaning workpiece monitoring area, the second field lens focuses light reflected by the cleaning workpiece monitoring area on the photoelectric sensor, and the filter lens is used for allowing the light source to emit light with specific wavelength to pass through after the light source is selected, so that interference of other light waves mixed in the photoelectric sensor is avoided; the photoelectric sensor converts received light intensity signals into electric signals, the electric signals are transmitted to the signal processing device to be analyzed and compared, the incident angle of light emitted by the light source to the surface of a cleaning workpiece is 30-60 degrees, the focal length of the first field lens is 210mm, the breadth is 100mm, the focal length of the second field lens is 210mm, and the breadth is 150 mm.
In this embodiment, select for use the aluminum alloy to wash the monitoring, include the following step:
s1, establishing reflectivity relations of different pollutants on the surface of the cleaning workpiece and base materials on the surface of the cleaning workpiece to light sources with different wavelengths according to process experiment data, selecting the light source with the wavelength with large reflectivity difference (large difference of reflected light intensity) between the pollutants and the base materials as the light source, enabling the light emitted by the light source to pass through a light source vibrating mirror to the surface of the cleaning workpiece, receiving the light by a photoelectric sensor through a second field lens after the light is reflected, and reading light source signals received by the photoelectric sensor by a signal processing device;
s2, scanning the cleaned surface of the workpiece by the light source under the drive of the light source galvanometer, acquiring information of the surface of the workpiece scanned and cleaned by the light source in real time by the signal processing device, and calculating a light intensity distribution diagram of the workpiece; the information comprises the moment when the light source scans to the light spot on the surface of the cleaned workpiece, the specific position of the surface of the cleaned workpiece corresponding to the moment and the light intensity corresponding to the moment;
and S3, analyzing the light intensity distribution graph of the cleaning workpiece through the signal processing device, comparing the constructed light intensity distribution graph data of the cleaning workpiece with the standard reflected light intensity in the signal processing device, judging whether the conformity of the standard reflected light intensity and the non-polluted reflected light intensity of the substrate on the surface of the cleaning workpiece reaches a set value, and carrying out fixed-point and quantitative judgment on the cleaning quality.
In step S1, the difference between the light intensity reflected by the substrate (aluminum alloy) on the surface of the workpiece and the light intensity reflected by the contaminant (oil stain) on the surface of the workpiece is 55%.
The light intensity of the pollutants on the surface of the cleaning workpiece and the light intensity of the light intensity reflected to the photoelectric sensor by the base material on the surface of the cleaning workpiece are matched by selecting a light source with a proper wavelength. Specifically, the matching method comprises the following steps: the test is carried out according to a single comparison principle, a light source with a proper wavelength is selected according to the reflectivity of the pollutants on the surface of the cleaning workpiece and the reflectivity of the base material of the cleaning workpiece, the difference value between the reflectivity of the pollutants on the surface of the cleaning workpiece and the reflectivity of the base material of the cleaning workpiece is larger than 30%, the light source emits light to be reflected to the photoelectric sensor to be received, and the reflected light intensity is in the receiving range of the photoelectric sensor.
Before the cleaning quality of the surface of the cleaning workpiece is monitored, the surface of the cleaning workpiece is subjected to laser cleaning, the cleaning workpiece moves through an XY-axis platform, and the wavelength of the light source is different from the wavelength range adopted by the laser cleaning.
The device is used for cleaning the greasy dirt on the surface of the metal material, the light source wavelength of 1064nm and the power of 100mW are selected for static monitoring in the embodiment, namely, after laser cleaning is completed, the surface of a cleaning workpiece is placed on an XY-axis platform for detection, and the standard reflected light intensity data measured when the surface of the cleaning workpiece is free of pollutants is shown in table 1:
TABLE 1
The specific construction method of the light intensity distribution graph of the cleaning workpiece comprises the following steps: scanning a monitoring area on the surface of a cleaning workpiece through a light source galvanometer, emitting point-like light from a light source, linearly scanning through the light source galvanometer, calculating the position of a light spot at a specific moment through the relation between scanning speed and time, calculating the specific position of the light spot on the surface of the cleaning workpiece scanned through the light source galvanometer, and displaying a time and photoelectric position relation graph through a graph to reconstruct a cleaning part graph of the whole cleaning workpiece; all light spot positions of the whole cleaning part graph are obtained in the steps, then the light intensity time acquired by the signal processing device corresponds to the cleaning part graph position of the cleaning workpiece, the light intensity distribution graph of the cleaning workpiece is finally obtained through the corresponding relation between the light spot position and the received light intensity time position in the graph, finally the light intensity distribution graph of the cleaning workpiece is compared with the standard reflected light intensity data measured when the surface of the cleaning workpiece is free of pollutants through the numerical value distribution of the light intensity of the signal processing device, and the light intensity distribution graph of the cleaning workpiece is analyzed, so that the cleaning quality is judged at a fixed point. In the comparison process of the numerical value distribution of the light intensity of the signal processing device and the standard reflected light intensity data, the read numerical value can be subjected to interval division, and if the read light intensity data is more than 85mW, the cleaning quality is judged to be excellent; the read light intensity data is 75-84mW, and the cleaning quality is judged to be qualified; the read light intensity data is below 75mW, and the cleaning quality is judged to be unqualified; thereby quantitatively determining the cleaning quality.
Example 2
In the embodiment, the cleaning workpiece is aluminum alloy, the pollutant is paint, the test is carried out by a single comparison principle, finally red light (with the wavelength of 650nm) is selected as a light source, and meanwhile, the filter with the wavelength of 650nm is selected as the filter, so that the influence of the light of the laser cleaning laser wavelength on the monitoring process is greatly reduced, the adaptability to different environments is stronger, and the real complex environment online monitoring system is realized; YAG laser is selected as cleaning laser, the wavelength is 1064nm, the power is 80W, and the cleaning quality of the cleaning workpiece is dynamically monitored, namely the cleaning process is monitored in real time.
The signal processing device is electrically connected with the monitoring light source emitter, the laser cleaning device and the control XY-axis platform, the device for line monitoring is integrally and automatically controlled, the signal processing device is used for collecting signals received by the photoelectric sensor, controlling the laser galvanometer to change a laser cleaning light path (namely cleaning head control), controlling the light source galvanometer to change the laser monitoring light path, and simultaneously controlling the movement of a cleaning workpiece on the XY-axis platform (axis control). When the device is used, the signal processing device controls the laser to emit light, the laser galvanometer is used for scanning and cleaning paint on the surface of a workpiece to be cleaned, the XY-axis platform is controlled to move, all pollutants on the surface of the workpiece to be cleaned are cleaned, meanwhile, the light source is adjusted to emit light, the light emitted by the light source is reflected and then enters the photoelectric sensor to be received, and the signal processing device carries out synchronous analysis and judgment; the method comprises the steps of controlling a light source galvanometer to enable a light track emitted by a light source to a cleaning workpiece to be consistent with a laser track emitted by a laser to the cleaning workpiece, processing the light track through a filtering algorithm to reduce motion errors of a scanning platform and an XY-axis platform, constructing a cleaning part graph of the whole cleaning workpiece, calculating the corresponding relation between the time of light intensity acquired by a signal processing device and the position of the cleaning part graph of the cleaning workpiece through the motion speed of a scanning speed axis control system of the light source galvanometer, finally obtaining a light intensity distribution graph of the cleaning workpiece through fitting processing of the cleaning part graph of the cleaning workpiece and the light intensity, and analyzing the light intensity distribution graph of the cleaning workpiece through comparison with standard reflected light intensity data, thereby quantitatively judging the cleaning quality at a fixed point. In the comparison process of the numerical value distribution of the light intensity of the signal processing device and the standard reflected light intensity data, the read numerical value can be subjected to interval division, and if the read light intensity data is more than 85mW, the cleaning quality is judged to be excellent; the read light intensity data is 75-84mW, and the cleaning quality is judged to be qualified; the read light intensity data is below 75mW, and the cleaning quality is judged to be unqualified; thereby quantitatively determining the cleaning quality.
Example 3
In this embodiment, the cleaning workpiece is made of iron, the contaminant is an oxide layer on the surface of the iron material, and the difference value between the intensity of light reflected by the contaminant (oxide layer) on the surface of the cleaning workpiece and the intensity of light reflected by the substrate (iron) on the surface of the cleaning workpiece to the photoelectric sensor is 65%; selecting a laser with the light source wavelength of 1064nm and the power of 100W for laser cleaning; monitoring by selecting a light source with the power of 100mW and the wavelength of 633 nm; the standard reflected light intensity data of the iron surface without pollutants is 60mW, the read numerical value can be divided into intervals in the comparison process of the numerical value distribution of the light intensity of the signal processing device and the standard reflected light intensity data, and if the read light intensity data is more than 55mW, the cleaning quality is judged to be excellent; the read light intensity data is 45-55mW, and the cleaning quality is judged to be qualified; and the read light intensity data is below 45mW, and the cleaning quality is judged to be unqualified.
Claims (6)
1. A device suitable for laser cleaning quality on-line monitoring is characterized by comprising a monitoring light source transmitter and a monitoring light source receiver,
the monitoring light source transmitter comprises a light source, a light source vibrating mirror and a first field lens, the monitoring light source receiver comprises a second field lens, a photoelectric sensor and a signal processing device, light emitted by the light source sequentially passes through the light source vibrating mirror and the first field lens to the surface of a cleaning workpiece, and is received by the photoelectric sensor through the second field lens after being reflected, and the photoelectric sensor is electrically connected with the signal processing device.
2. The device suitable for online monitoring of laser cleaning quality according to claim 1, further comprising a laser cleaning device, wherein the laser cleaning device comprises a laser, a laser galvanometer, a third field lens and an XY-axis platform, the cleaning workpiece is arranged on the XY-axis platform, and laser emitted by the laser sequentially passes through the laser galvanometer and the third field lens to the surface of the cleaning workpiece for laser cleaning.
3. The device suitable for the online monitoring of the laser cleaning quality as claimed in claim 1 or 2, wherein the monitoring light source receiver further comprises a light filter, and the light emitted by the light source sequentially passes through the light source vibrating mirror, the first field lens to the surface of the cleaning workpiece, and then is reflected and received by the light filter, the second field lens to the photoelectric sensor.
4. The device suitable for the online monitoring of the laser cleaning quality as claimed in claim 3, wherein the signal processing device is electrically connected with the monitoring light source emitter, the laser cleaning device and the XY axis platform.
5. The device as claimed in claim 4, wherein the focal length of the first field lens is 180-300mm, the breadth is 80-150mm, and the focal length of the second field lens is 180-300mm, the breadth is 100-200 mm.
6. The device suitable for the online monitoring of the laser cleaning quality as claimed in claim 5, wherein the focal length of the first field lens is 210mm and the width is 100mm, and the focal length of the second field lens is 210mm and the width is 150 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114608660A (en) * | 2022-03-28 | 2022-06-10 | 上海建冶科技股份有限公司 | Real-time monitoring system for laser rust removal process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114608660A (en) * | 2022-03-28 | 2022-06-10 | 上海建冶科技股份有限公司 | Real-time monitoring system for laser rust removal process |
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