Laser cleaning device and laser cleaning method

Abstract

The invention provides a laser cleaning device and a laser cleaning method, and belongs to the technical field of laser cleaning, and the laser cleaning device comprises a laser, a lifting platform, a range finder and a controller. Wherein the laser is used for emitting laser, the lifting frequency table is located below the laser and used for bearing a workpiece and adjusting the distance between the workpiece and the laser, and the laser is suitable for irradiating the surface of the workpiece to form light spots. The range finder is used for measuring a first distance between the light spot and the range finder. The controller is electrically connected with the lifting platform and the distance measuring instrument and is configured to control the lifting platform to ascend and descend according to the first distance so that the first distance can reach a preset distance interval. According to the laser cleaning device, the distance between the laser device and the surface of the workpiece can be within a proper range, then the laser cleaning effect is guaranteed, frequent manual adjustment is not needed, and the laser cleaning efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of laser cleaning, and in particular to a laser cleaning device and a laser cleaning method. Background Art

[0002] Laser cleaning is a cleaning technology that uses high-energy lasers to irradiate the surface of an object, rapidly evaporating impurities, pollutants or coatings or cleaning glass through optical and thermal effects. It has been widely used in various scenarios due to its advantages such as less damage to the substrate, less harm to the human body, and environmental friendliness.

[0003] The laser cleaning device emits a laser beam, which is focused to form a focus on the workpiece surface, thereby achieving rapid laser cleaning. The appropriate focus position can improve the cleaning efficiency. If the focus deviates, it is easy to cause problems such as poor laser cleaning effect or damage to the workpiece. In the related art, when cleaning the surface of a warped workpiece, due to the large fluctuations on the surface of the warped workpiece, the focus position needs to be adjusted frequently, resulting in a significant reduction in the laser cleaning efficiency and the cleaning quality cannot be guaranteed. Summary of the invention

[0004] The embodiments of the present application provide a laser cleaning device and a laser cleaning method, which can bring the surface of a workpiece within a defocus range, ensure the laser cleaning effect, and improve the laser cleaning efficiency.

[0005] In a first aspect, an embodiment of the present application provides a laser cleaning device, comprising:

[0006] Laser, used for emitting laser light;

[0007] A lifting platform is located below the laser. The lifting platform is used to carry the workpiece and adjust the distance between the workpiece and the laser. The laser is suitable for irradiating the surface of the workpiece to form a light spot.

[0008] a rangefinder, for measuring a first distance between the light spot and the rangefinder itself;

[0009] The controller is electrically connected to the lifting platform and the rangefinder. The controller is configured to control the lifting platform to rise and fall along a first direction according to the first distance so that the first distance reaches a preset distance interval.

[0010] In some embodiments, the minimum value in the preset distance interval is the second distance L2, and the maximum value is the third distance L3;

[0011] The first distance L1, the second distance L2 and the distance L3 satisfy: L2≤L1≤L3;

[0012] When L1=L2, the distance between the laser and the workpiece surface is H1, and when L1=L3, the distance between the laser and the workpiece surface is H2, H1=H+ΔH, H2=H-ΔH;

[0013] Wherein, H represents the focal length of the laser, and ΔH represents the preset defocus amount.

[0014] In some embodiments, the laser cleaning device further comprises a bracket;

[0015] The laser and the rangefinder are arranged on a bracket.

[0016] In some embodiments, the laser cleaning device further includes a base, and the bracket and the lifting platform are both located on the base.

[0017] In some embodiments, the bracket is a three-axis moving mechanism, the three-axis moving mechanism is electrically connected to the controller, and the three-axis moving mechanism is suitable for adjusting the movement of the laser and the rangefinder.

[0018] In some embodiments, the support includes a first robotic arm, and the laser and the rangefinder are both mounted on the first robotic arm.

[0019] In a second aspect, an embodiment of the present application further provides a laser cleaning method, based on the laser cleaning device as described above, comprising:

[0020] Place the workpiece on the lifting platform;

[0021] Control the laser to emit laser so that the laser irradiates the surface of the workpiece to form a light spot;

[0022] Measuring a first distance L1 between the light spot and the rangefinder itself by means of a rangefinder;

[0023] According to the first distance L1, the lifting platform is adjusted so that the first distance L1 reaches a preset distance interval for laser cleaning.

[0024] In some embodiments, before measuring the first distance L1 between the light spot and the rangefinder itself by the rangefinder, the method further includes:

[0025] Make the distance between the laser and the workpiece surface reach the upper limit of negative defocus, obtain the distance between the light spot and the rangefinder itself through the rangefinder, and obtain the second distance L2;

[0026] Make the distance between the laser and the workpiece surface reach the upper limit of the positive defocus amount, obtain the distance between the light spot and the rangefinder itself through the rangefinder, and obtain the third distance L3;

[0027] According to the second distance L2 and the third distance L3, a preset distance interval is acquired.

[0028] In some embodiments, according to the first distance L1, adjusting the lifting platform so that the first distance L1 reaches a preset distance interval includes:

[0029] Compare the first distance L1 with the second distance L2 and the third distance L3;

[0030] If L1<L2, the lifting platform is controlled to rise;

[0031] If L3<L1, control the lifting platform to descend;

[0032] If L2≤L1≤L3, maintain the position of the lifting platform.

[0033] In some embodiments, after adjusting the lifting platform according to the first distance L1 so that the first distance L1 reaches a preset distance interval and performing laser cleaning, the method further includes:

[0034] The laser and the rangefinder are driven to move by the bracket, and the first distance L1 is acquired again.

[0035] Beneficial effects of the embodiments of the present application:

[0036] The laser cleaning device provided in the embodiment of the present application includes a laser, a lifting platform, a rangefinder and a controller. Among them, the laser is used to emit laser, and the lifting frequency station is located below the laser, which is used to carry the workpiece and adjust the distance between the workpiece and the laser. The laser is suitable for irradiating the surface of the workpiece to form a light spot. The rangefinder is used to measure the first distance between the light spot and the rangefinder itself. The controller is electrically connected to the lifting platform and the rangefinder, and is configured to control the lifting of the lifting platform according to the first distance so that the first distance reaches a preset distance interval. The laser cleaning device provided in the present application uses a controller to control the rangefinder and the lifting platform in linkage, so that the first distance between the rangefinder and the light spot is within a preset distance range, thereby making the distance between the laser and the surface of the workpiece always within a suitable range, thereby ensuring the laser cleaning effect, without the need for frequent manual adjustments, and improving the efficiency of laser cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 This is a schematic diagram of the structure of the laser cleaning device provided in the embodiment of the present application. Figure 1 ;

[0039] Figure 2 This is a schematic diagram of the structure of the laser cleaning device provided in the embodiment of the present application. Figure 2 ;

[0040] Figure 3 This is a schematic diagram of the structure of the laser cleaning device provided in the embodiment of the present application. Figure 3 ;

[0041] Figure 4 It is a schematic flow chart of the laser cleaning method provided in the embodiment of the present application.

[0042] Description of reference numerals:

[0043] 1. Laser; 2. Lifting platform; 3. Workpiece; 31. Light spot; 4. Rangefinder; 5. Bracket; 51. First robotic arm; 6. Base. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0045] First, as Figure 1 As shown, the laser cleaning device provided in the embodiment of the present application includes a laser 1, a lifting platform 2, a rangefinder 4 and a controller. Among them, the laser 1 is used to emit laser, and the lifting frequency station is located below the laser 1, which is used to carry the workpiece 3 and adjust the distance between the workpiece 3 and the laser 1. The laser is suitable for irradiating the surface of the workpiece 3 to form a light spot 31. The rangefinder 4 is used to measure the first distance between the light spot 31 and the rangefinder 4 itself. The controller is electrically connected to the lifting platform 2 and the rangefinder 4, and is configured to control the lifting and lowering of the lifting platform 2 according to the first distance so that the first distance reaches a preset distance interval. The laser cleaning device provided in the present application uses the controller to control the rangefinder 4 and the lifting platform 2 in linkage, so that the first distance between the rangefinder 4 and the light spot 31 is within the preset distance range, so that the distance between the laser 1 and the surface of the workpiece 3 is always in a suitable range, thereby ensuring the laser cleaning effect, without the need for frequent manual adjustment, and improving the efficiency of laser cleaning.

[0046] In the related art, when cleaning a workpiece 3 with a warped surface, the uneven surface will cause frequent changes between the laser 1 and the surface of the workpiece 3. In order to ensure a better laser cleaning effect, it is necessary to continuously measure the distance between the laser 1 and the surface of the workpiece 3 and adjust the distance between the laser 1 and the surface of the workpiece 3. The embodiment of the present application realizes the linkage control of the rangefinder 4 and the lifting platform 2 through a controller. By setting the first distance and the preset distance interval, the laser cleaning device can always keep the distance between the laser 1 and the surface of the workpiece 3 within an appropriate range when performing laser cleaning on the workpiece 3 with a warped surface, thereby reducing the participation of operators, ensuring the laser cleaning effect and improving the laser cleaning efficiency.

[0047] The laser 1 may be a laser galvanometer. The laser galvanometer is also called a laser scanner, which is a high-precision, high-speed laser emitting device. The power of the laser 1, the wavelength of the emitted laser and other parameters may be selected according to actual needs.

[0048] In some embodiments, Figure 2 and Figure 3 As shown, the minimum value in the preset distance interval is the second distance L2, and the maximum value is the third distance L3. The first distance L1 and the second distance L2 and the distance L3 satisfy: L2≤L1≤L3. When L1=L2, the distance between the laser 1 and the surface of the workpiece 3 is H1, and when L1=L3, the distance between the laser 1 and the surface of the workpiece 3 is H2, H1=H+ΔH, H2=H-ΔH, where H represents the focal length of the laser, and ΔH represents the preset defocus amount.

[0049] Specifically, H indicates that the distance between the laser 1 and the surface of the workpiece 3 is equal to the focal length of the laser, and at this time the focus of the laser is located on the surface of the workpiece 3.

[0050] During the laser cleaning process, when the light spot 31 is at the focal position, the laser cleaning effect is the best. However, considering that the laser scanning speed is fast during laser cleaning, and the lifting speed of the lifting platform 2 is relatively slow, it is easy to cause the speeds of the two to be mismatched. Therefore, the embodiment of the present application sets a preset defocus amount to keep the distance between the laser 1 and the surface of the workpiece 3 within a certain defocus range, while ensuring the laser cleaning effect, providing a certain redundant range for the lifting of the lifting platform 2, thereby shortening the lifting time of the lifting platform 2 and further improving the efficiency of laser cleaning.

[0051] It should be noted that the defocus refers to the distance between the laser focus and the target material. In actual operation, the defocus can be reasonably set according to parameters such as the material of the workpiece 3, the thickness of the workpiece 3, the power of the laser 1, and the focal length of the laser 1, and no specific limitation is made here.

[0052] In some embodiments, Figure 1-Figure 3As shown, the laser cleaning device further includes a bracket 5. The laser 1 and the rangefinder 4 are arranged on the bracket 5. The bracket 5 can fix the laser 1 and the rangefinder 4, so that the laser 1 is located above the lifting platform 2, and the laser emitted by the laser 1 is irradiated onto the surface of the workpiece 3 on the lifting platform 2. At the same time, it also helps the rangefinder 4 to measure the first distance between the light spot 31 and the rangefinder 4 itself, thereby improving the stability and accuracy of the measurement.

[0053] In some embodiments, Figure 1-Figure 3 As shown, the laser cleaning device also includes a base 6, and the bracket 5 and the lifting platform 2 are both located on the base 6. The base 6 can provide support for the lifting platform 2 and the bracket 5. By arranging the bracket 5 and the lifting platform 2 on the base 6, the laser 1, the rangefinder 4, and the lifting platform 2 can form a whole, thereby improving stability.

[0054] In some embodiments, the bracket 5 is a three-axis moving mechanism, which is electrically connected to the controller and is suitable for adjusting the movement of the laser 1 and the rangefinder 4 .

[0055] It can be understood that the three-axis moving mechanism refers to a mechanism that can be moved and adjusted in the front-to-back direction, left-to-right direction, and up-down direction. The three-axis moving mechanism can drive the laser 1 and the rangefinder 4 to move in the front-to-back direction, left-to-right direction, and up-down direction, thereby changing the relative position of the laser 1 and the rangefinder 4 relative to the workpiece 3, and then laser cleaning is performed on different positions on the surface of the workpiece 3. The three-axis moving mechanism is electrically connected to the controller, and the rangefinder 4, the lifting platform 2, and the three-axis moving mechanism can be controlled in linkage by the controller to ensure the effect of laser cleaning and improve the efficiency of laser cleaning.

[0056] In some embodiments, Figure 1-Figure 3 As shown, the bracket 5 includes a first mechanical arm 51, and the laser 1 and the rangefinder 4 are both mounted on the first mechanical arm 51. By mounting the laser 1 and the rangefinder 4 on the first mechanical arm 51, when the three-axis moving mechanism moves and adjusts, the relative position of the laser 1 and the rangefinder 4 does not change, thereby improving the stability of the first distance measurement and simplifying the control process.

[0057] For example, Figure 1-Figure 3 As shown, the laser 1 can be installed at one end of the first mechanical arm 51 , and the rangefinder 4 can be installed below the first mechanical arm 51 and close to the laser 1 .

[0058] It can be understood that the installation positions of the laser 1 and the first robotic arm 51 are not limited to the above-mentioned positions. As long as the relative positions of the laser 1 and the rangefinder 4 do not change during the laser cleaning process and the laser 1 does not block the rangefinder 4, technicians in this field can reasonably set the installation position and installation method according to actual needs.

[0059] In a second aspect, the embodiments of the present application further provide a laser cleaning method, based on the laser cleaning device as described above, such as Figure 4 As shown, including:

[0060] S1, placing the workpiece 3 on the lifting platform 2;

[0061] S2, controlling the laser 1 to emit laser light, so that the laser light irradiates the surface of the workpiece 3 to form a light spot 31;

[0062] S3, measuring a first distance L1 between the light spot 31 and the rangefinder 4 itself by means of the rangefinder 4;

[0063] S4. According to the first distance L1, the lifting platform 2 is adjusted so that the first distance L1 reaches a preset distance interval, and laser cleaning is performed.

[0064] By placing the workpiece 3 on the lifting platform 2, it is convenient to adjust the height of the workpiece 3 through the lifting platform 2, and then adjust the distance between the surface of the workpiece 3 and the laser 1. Then the laser 1 is made to emit a laser, so that the laser is irradiated on the surface of the workpiece 3, a light spot 31 is formed, and the surface of the workpiece 3 is laser cleaned. The first distance L1 between the light spot 31 and the rangefinder 4 itself is measured by the rangefinder 4, and it is determined whether the first distance L1 is within the preset distance interval. The lifting platform 2 is adjusted according to the judgment structure, so that the distance between the laser 1 and the surface of the workpiece 3 is controlled within a suitable range to ensure the laser cleaning effect. Through the linkage control of the rangefinder 4 and the lifting platform 2, the distance between the laser 1 and the surface of the workpiece 3 is always within a suitable range, thereby ensuring the laser cleaning effect, without the need for frequent manual adjustment, and improving the efficiency of laser cleaning.

[0065] In some embodiments, before measuring the first distance L1 between the light spot 31 and the rangefinder 4 itself by the rangefinder 4, the method further includes:

[0066] The distance between the laser 1 and the surface of the workpiece 3 is made to reach the upper limit of the negative defocus amount, and the distance between the light spot 31 and the rangefinder 4 itself is obtained by the rangefinder 4 to obtain the second distance L2;

[0067] The distance between the laser 1 and the surface of the workpiece 3 is made to reach the upper limit of the positive defocus amount, and the distance between the light spot 31 and the rangefinder 4 itself is obtained by the rangefinder 4 to obtain the third distance L3;

[0068] According to the second distance L2 and the third distance L3, a preset distance interval is acquired.

[0069] That is to say, the maximum and minimum values ​​of the preset distance interval are first determined by adjusting the distance between the laser 1 and the surface of the workpiece 3. The minimum value of the preset distance interval is the second distance L2, corresponding to the negative defocus upper limit of the distance between the laser 1 and the surface of the workpiece 3, and when the maximum value of the preset distance interval is the third distance L3, the distance between the laser 1 and the surface of the workpiece 3 is the positive defocus upper limit. Therefore, when the first distance L1 is between the second distance L2 and the third distance L3, the distance between the laser 1 and the surface of the workpiece 3 is between the negative defocus upper limit and the positive defocus upper limit, ensuring a good laser cleaning effect.

[0070] In some embodiments, according to the first distance L1, adjusting the lifting platform 2 so that the first distance L1 reaches a preset distance interval includes:

[0071] Compare the first distance L1 with the second distance L2 and the third distance L3;

[0072] If L1<L2, control the lifting platform 2 to rise;

[0073] If L3<L1, control the lifting platform 2 to descend;

[0074] If L2≤L1≤L3, the position of the lifting platform 2 is maintained.

[0075] When L1<L2, it means that the distance between the laser 1 and the surface of the workpiece 3 is too far. By controlling the lifting platform 2 to rise, the distance between the laser 1 and the surface of the workpiece 3 can be shortened until the first distance L1 reaches the preset distance interval. At that time, it means that the distance between the laser 1 and the surface of the workpiece 3 is too close. By controlling the lifting platform 2 to descend, the distance between the laser 1 and the surface of the workpiece 3 can be expanded until the first distance L1 reaches the preset distance interval. At that time, it means that the distance between the laser 1 and the surface of the workpiece 3 is within the preset defocus range, and the lifting platform 2 does not need to be adjusted. The embodiment of the present application adjusts the position of the lifting platform 2 according to the correspondence between the distance between the laser 1 and the surface of the workpiece 3, and the first distance L1, which can simplify the adjustment process, so that during the laser cleaning process, the surface of the workpiece 3 is always in a suitable defocus range, ensuring the uniformity and cleanliness of laser cleaning and improving the efficiency of laser cleaning.

[0076] In some embodiments, after adjusting the lifting platform 2 according to the first distance L1 so that the first distance L1 reaches a preset distance interval and performing laser cleaning, the method further includes:

[0077] The laser 1 and the distance meter 4 are moved by the bracket 5, and the first distance L1 is acquired again.

[0078] During the laser cleaning process, it is necessary to continuously change the irradiation position of the laser on the surface of the workpiece 3, so as to clean different positions on the surface of the workpiece 3. In the embodiment of the present application, the laser 1 and the rangefinder 4 are driven to move by the bracket 5, so that the relative positions of the laser 1 and the rangefinder 4 and the workpiece 3 are changed at the same time. Among them, the change in the position of the laser emitted by the laser 1 on the surface of the workpiece 3 can achieve laser cleaning of different positions on the surface of the workpiece 3. In addition, since the rangefinder 4 moves with the laser 1, the relative relationship between the rangefinder 4 and the laser 1 does not change, so that the distance between the laser 1 and the surface of the workpiece 3, and the corresponding relationship between the first distance L1 remain unchanged, which simplifies the laser cleaning process.

[0079] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A laser cleaning device, characterized in that: include: Laser, used for emitting laser light; A lifting platform is located below the laser, and is used to carry a workpiece and adjust the distance between the workpiece and the laser. The laser is suitable for irradiating the surface of the workpiece to form a light spot; a rangefinder, used to measure a first distance between the light spot and the rangefinder itself; A controller is electrically connected to the lifting platform and the rangefinder, and the controller is configured to control the lifting platform to rise and fall along a first direction according to the first distance so that the first distance reaches a preset distance interval.

2. The laser cleaning device according to claim 1, characterized in that: The minimum value in the preset distance interval is the second distance L2, and the maximum value is the third distance L3; The first distance L1, the second distance L2 and the distance L3 satisfy the following: L2≤L1≤L3; When L1=L2, the distance between the laser and the workpiece surface is H1, and when L1=L3, the distance between the laser and the workpiece surface is H2, H1=H+ΔH, H2=H-ΔH; Wherein, H represents the focal length of the laser, and ΔH represents the preset defocus amount.

3. The laser cleaning device according to claim 1 or 2, characterized in that: Also includes a stand; The laser and the rangefinder are arranged on the bracket.

4. The laser cleaning device according to claim 3, characterized in that: It also includes a base, and the bracket and the lifting platform are both located on the base.

5. The laser cleaning device according to claim 3, characterized in that: The bracket is a three-axis moving mechanism, which is electrically connected to the controller and is suitable for adjusting the movement of the laser and the rangefinder.

6. The laser cleaning device according to claim 5, characterized in that: The support comprises a first mechanical arm, and the laser and the rangefinder are both mounted on the first mechanical arm.

7. A laser cleaning method, based on the laser cleaning device according to any one of claims 1 to 6, characterized in that: include: Place the workpiece on the lifting platform; Controlling the laser to emit laser light so that the laser light irradiates the surface of the workpiece to form a light spot; Measuring a first distance L1 between the light spot and the rangefinder itself by the rangefinder; According to the first distance L1, the lifting platform is adjusted so that the first distance L1 reaches a preset distance interval for laser cleaning.

8. The laser cleaning method according to claim 7, characterized in that: Before measuring the first distance L1 between the light spot and the rangefinder itself by the rangefinder, the method further includes: The distance between the laser and the surface of the workpiece is made to reach the upper limit of the negative defocus amount, and the distance between the light spot and the rangefinder itself is obtained by the rangefinder to obtain a second distance L2; The distance between the laser and the surface of the workpiece is made to reach the upper limit of the positive defocus amount, and the distance between the light spot and the rangefinder itself is obtained by the rangefinder to obtain a third distance L3; The preset distance interval is acquired according to the second distance L2 and the third distance L3.

9. The laser cleaning method according to claim 8, characterized in that: The adjusting the lifting platform according to the first distance L1 so that the first distance L1 reaches a preset distance interval includes: comparing the first distance L1 with the second distance L2 and the third distance L3; If L1<L2, control the lifting platform to rise; If L3<L1, control the lifting platform to descend; If L2≤L1≤L3, the position of the lifting platform is maintained.

10. The laser cleaning method according to claim 7, characterized in that: After adjusting the lifting platform according to the first distance L1 so that the first distance L1 reaches a preset distance interval and performing laser cleaning, the method further includes: The laser and the rangefinder are driven to move by the bracket, and the first distance L1 is acquired again.

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