Multi-time laser cleaning system based on rotating mirror

Abstract

The multi-time laser cleaning system comprises a cleaning laser device, a collimating mirror set, a first spectroscope and a multi-face rotating mirror mechanism are sequentially arranged on a transmission light path of laser emitted by the cleaning laser device, a first reflecting mirror is arranged on a reflecting light path of the first spectroscope, and a second reflecting mirror is arranged on a reflecting light path of the multi-face rotating mirror mechanism. The first reflecting mirror can reflect the cleaning laser reflected by the first spectroscope to the multi-surface rotating mirror mechanism; a cleaning table for placing a to-be-cleaned workpiece is arranged below the multi-surface rotating mirror mechanism; the multi-face rotating mirror mechanism comprises a rotating mirror body, a rotating shaft is arranged in the center of the rotating mirror body in a penetrating mode, and one end of the rotating shaft is connected with a driving motor. A plurality of second reflectors are arranged on the side wall of the rotating mirror body in the circumferential direction. And at least one second spectroscope is arranged between the first spectroscope and the first reflecting mirror. According to the laser cleaning device, multiple times of laser cleaning of the surface of a workpiece can be achieved, the cleaning effect is guaranteed, and meanwhile the laser cleaning efficiency is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of laser cleaning, and in particular relates to a multiple laser cleaning system based on a rotating mirror. Background Art

[0002] Laser cleaning is to apply laser to the contaminants on the surface of the material. After the contaminants absorb the laser energy, they produce a series of complex physical and chemical interactions such as vibration, melting, ablation, gasification, laser-induced plasma, photodecomposition, etc., and are separated from the surface of the material. Compared with traditional cleaning technology, laser cleaning has the advantages of no mechanical contact, selective local cleaning, no damage, high degree of automation, low noise, long-distance control, no pollution, fiber optic cleaning lasers require almost no maintenance, small size and weight, low operating cost, can be integrated with mechanical devices to achieve remote control, and are not restricted by the cleaning site. At the same time, the laser wavelength of the fiber optic cleaning laser is in the 1μm band, and metal oxides have a high spectral absorption rate in this band.

[0003] Although laser cleaning technology has developed rapidly in recent years, and the types of cleaning materials and application fields have continued to expand, there are still many problems in laser cleaning that have not been solved. These mainly include: during the laser cleaning process, due to dust and water stains on the surface of the workpiece, the paint layer or rust layer is uneven, resulting in incomplete cleaning in one laser cleaning process, requiring repeated cleaning twice or even more than three times; when the paint layer or rust layer is too thick, a laser power of more than 10,000 watts is required, and during the cleaning process, due to the excessively high focusing power, the temperature of the underlying workpiece is easily too high and damaged. Therefore, it is urgent to develop a device that can achieve two or more cleanings in a single cleaning process to improve the efficiency of laser cleaning, reduce the power of a single laser, and prevent damage to the workpiece base due to excessive power. Utility Model Content

[0004] The utility model aims to provide a multiple laser cleaning system based on a rotating mirror, so as to solve the technical problems existing in the existing laser cleaning, that is, one-time cleaning is not clean enough and the laser power is too high to damage the substrate.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A multiple laser cleaning system based on a rotating mirror comprises a cleaning laser, wherein a collimating mirror group, a first beam splitter and a multi-faceted rotating mirror mechanism are sequentially arranged on the transmission optical path of the laser emitted by the cleaning laser, a first reflecting mirror is arranged on the reflecting optical path of the first beam splitter, and the first reflecting mirror can reflect the cleaning laser reflected by the first beam splitter onto the multi-faceted rotating mirror mechanism; a cleaning table for placing a workpiece to be cleaned is arranged below the multi-faceted rotating mirror mechanism;

[0007] The multi-faceted rotating mirror mechanism comprises a rotating mirror body, a rotating shaft is provided through the center of the rotating mirror body, and one end of the rotating shaft is connected to a driving motor;

[0008] A plurality of second reflectors are arranged on the side wall of the rotating mirror body along the circumferential direction.

[0009] This new application also has the following technical features:

[0010] Specifically, at least one second beam splitter is arranged between the first beam splitter and the first reflector.

[0011] Furthermore, the number of the second reflectors is 5 to 8.

[0012] Furthermore, a field lens group for focusing is arranged between the multi-faceted rotating mirror mechanism and the cleaning table.

[0013] Furthermore, the rotation speed of the polygonal rotating mirror mechanism is 1000-2000 r / m.

[0014] Furthermore, a laser film layer is provided on the outer surface of the second reflector.

[0015] Furthermore, the field lens assembly includes a first lens and a second lens which are arranged in parallel.

[0016] Furthermore, the first reflector is arranged directly above the first beam splitter, and the first reflector and the first beam splitter are arranged in parallel, and the acute angles formed by the first beam splitter and the first reflector and the horizontal plane are both 45°.

[0017] Compared with the prior art, the utility model has the following technical effects:

[0018] The utility model realizes multi-path collimation and splitting of cleaning laser by setting a collimation system, a first beam splitter, a second beam splitter, a first reflector and a second reflector; the incident angle of the multi-path laser is changed by setting a high-speed rotating mirror, and the multi-path laser focusing on the surface of the cleaning workpiece is realized by the field mirror group. The utility model can realize multiple cleaning of the cleaning workpiece, and greatly improves the efficiency of laser cleaning while ensuring the laser cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the laser cleaning system of Example 1;

[0020] Figure 2 is a top view of the laser cleaning system of Example 1;

[0021] Figure 3 is a top view of the laser cleaning system of Example 2;

[0022] Figure 4This is the principle diagram of laser angle change.

[0023] The numbers in the figure represent:

[0024] 1-cleaning laser, 2-collimating lens group, 3-first beam splitter, 4-polygonal rotating mirror mechanism, 5-cleaning table, 6-field mirror group, 7-first reflecting mirror, 8-second beam splitter; 41-rotating mirror body, 42-rotating shaft, 43-second reflecting mirror. DETAILED DESCRIPTION

[0025] The specific implementation methods of the present utility model are given below. It should be noted that the present utility model is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present utility model.

[0026] It should be noted that when describing the orientation of the present invention, the orientation or positional relationship indicated by the terms "above", "below", "top", "bottom", etc. is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "Inside" and "outside" refer to the inner core of the corresponding component outline, and the above terms cannot be understood as limiting the present invention. If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Example 1

[0030] Following the above technical solution, Figure 1 and Figure 2As shown, this embodiment discloses a multiple laser cleaning system based on a rotating mirror, comprising a cleaning laser 1 for generating a cleaning laser, a collimating lens group 2, a reflecting mirror group 3 and a multi-faceted rotating mirror mechanism 4 are sequentially arranged on the transmission optical path of the laser emitted by the cleaning laser 1, a first reflecting mirror 7 is arranged on the reflecting optical path of the first beam splitter 3, and the first reflecting mirror 7 can reflect the cleaning laser reflected by the first beam splitter 3 onto the multi-faceted rotating mirror mechanism 4; a cleaning table 5 for placing a workpiece to be cleaned is arranged below the multi-faceted rotating mirror mechanism 4;

[0031] The multi-faceted rotating mirror mechanism 4 includes a rotating mirror body 41, which is a regular polygonal prism structure, and a rotating shaft 42 is provided in the center of the rotating mirror body 41, and one end of the rotating shaft 42 is connected to the driving motor; the multi-faceted rotating mirror mechanism 4 can rotate around its axis at a high speed under the drive of the driving motor. The laser emitted by the cleaning laser 1 becomes a collimated laser after passing through the collimating lens group 2.

[0032] The first beam splitter 3 divides the laser light emitted by the cleaning laser 1 into reflected light and transmitted light. The reflected light can generate laser light parallel to the transmitted light after being reflected by the first reflector 7, and then incident on the polygonal mirror mechanism 4. When the polygonal mirror mechanism 4 is running at a high speed, the angle of the laser light incident on the polygonal mirror mechanism 4 changes, that is, the setting of the polygonal mirror mechanism 4 can change the angle of the incident laser light. The principle is as follows: Figure 4 shown.

[0033] As a preferred solution of this embodiment, multiple (optionally 5 to 8) second reflectors 43 are arranged circumferentially on the outer side wall of the rotating mirror body 41 of the regular polygonal prism structure. Under other working conditions, the number of second reflectors 43 can also be selected according to the number of cleaning surfaces.

[0034] As a preferred solution of this embodiment, a field lens group 6 for focusing is also arranged between the multi-faceted rotating mirror mechanism 4 and the cleaning table 5. In this embodiment, the field lens group 6 consists of a first lens and a second lens with high transmittance and focusing transmission functions. The first lens and the second lens are both provided with a high-transmittance laser film, which can achieve laser focusing.

[0035] As a preferred solution of this embodiment, the rotation speed of the polygonal mirror mechanism 4 is 1000-2000 r / m.

[0036] As a preferred solution of this embodiment, a laser film layer is provided on the outer surface of the second reflecting mirror 43 .

[0037] As a preferred solution of this embodiment, the first reflector 7 is arranged directly above the first beam splitter 4, and the first reflector 7 and the first beam splitter 4 are arranged parallel to each other, the first beam splitter 4 is at 45° to the horizontal plane, and the first reflector 7 is at 45° to the horizontal plane.

[0038] As a preferred solution of this embodiment, the first beam splitter 3, the second beam splitter 8, the first reflector 7 and the second reflector 43 are all plane mirrors.

[0039] The working process of this embodiment is as follows:

[0040] The workpiece to be cleaned is placed on the cleaning table 5 and opposite to the field lens group 6, and the cleaning laser 1 is started. The cleaning laser 1 emits laser, and the first beam splitter 3 divides the laser into transmitted light and reflected light. The transmitted light is directly incident on the rotating mirror body 41, and is reflected by the second reflector 43 to form a first cleaning laser; the reflected light is reflected by the first reflector 7 and then incident on the rotating mirror body 4, and is reflected by the second reflector 43 to form a second cleaning laser. The first cleaning laser and the second cleaning laser are focused by the field lens group 6 and act on the cleaning workpiece 11 to remove pollutants on the surface of the cleaning workpiece 11.

[0041] Example 2

[0042] Following the above technical solution, Figure 3 As shown, in this embodiment, the first beam splitter 3, the second beam splitter 8 and the first reflector 33 are arranged in parallel from bottom to top in the multiple laser cleaning system, and the acute angles formed by the first beam splitter 3, the second beam splitter 8 and the first reflector 33 and the horizontal plane are all 45°.

[0043] The working process of this embodiment is as follows:

[0044] The workpiece to be cleaned is placed on the cleaning table 5 and faces the field mirror group 6, and the cleaning laser 1 is started. The cleaning laser 1 emits laser light, and the first beam splitter 3 divides the laser light into transmitted light and reflected light. The transmitted light generated by the first beam splitter 3 is projected onto the rotating mirror body 4, and is reflected by the second reflector 43 to form the first cleaning laser. The reflected light generated by the first beam splitter 3 is irradiated onto the second beam splitter 8, and the reflected light generated by the second beam splitter 8 is projected onto the rotating mirror body 4, and is reflected by the second reflector 43 to form the second cleaning laser. The transmitted light generated by the second beam splitter 8 is reflected by the first reflector 33 and then projected onto the rotating mirror body 4, and is reflected by the second reflector 43 to form the third cleaning laser. The first cleaning laser, the second cleaning laser, and the third cleaning laser are focused by the field mirror group 6 and act on the cleaning workpiece 11 to remove pollutants on the surface of the cleaning workpiece 11.

[0045] In this embodiment, the function selection of laser cleaning can be achieved by selecting the parameters of the first beam splitter 3 and the second beam splitter 8. For example, the first cleaning laser is set to low power through the setting of the beam splitter, which is mainly used to pre-treat the dust on the surface of the workpiece. The second cleaning laser and the third cleaning laser have the same power and are both greater than the first laser power. The second cleaning laser and the third cleaning laser respectively perform primary and secondary cleaning of the workpiece rust layer (paint layer) to ensure the cleaning effect of the entire cleaning process.

[0046] Application Examples

[0047] In this application example, the surface of the workpiece with rust layer is cleaned, and a 5000W laser is split by a beam splitter with a splitting ratio of 1:4. The multi-faceted mirror mechanism uses an octahedron with a rotation speed of 1000 revolutions per second. The field mirror group is composed of two concave mirrors coated with high-transmittance films, with a focal length of 400mm. The results show that the powers of the two laser beams generated after the splitting are 1000W and 4000W respectively. The rust layer of the workpiece to be cleaned is first pre-scanned with a 1000W laser, and then deep cleaning is completed with a power of 4000W, and finally the surface of the workpiece is cleaned.

[0048] Comparative Example

[0049] The structure of the laser cleaning system used in this comparative example is basically the same as that of Example 1, with the only difference being that no reflector is provided in this cleaning system, that is, a single-path laser is used to complete the cleaning.

[0050] A 5000W cleaning laser was used, the multi-faceted rotating mirror mechanism used an octahedral mirror, the rotation speed was 1000 revolutions per second, the field mirror assembly consisted of two concave mirrors coated with high-transmittance films, and the focal length was 400mm. The results showed that the rust layer was not cleaned after cleaning.

[0051] Those skilled in the art to which the present invention belongs may make various modifications or additions to the described specific embodiments or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

Claims

1. A multiple laser cleaning system based on a rotating mirror, comprising a cleaning laser (1), characterized in that: A collimating lens group (2), a first beam splitter (3) and a multi-faceted rotating mirror mechanism (4) are sequentially arranged on the transmission light path of the laser emitted by the cleaning laser (1); a first reflecting mirror (7) is arranged on the reflection light path of the first beam splitter (3); the first reflecting mirror (7) is capable of reflecting the cleaning laser reflected by the first beam splitter (3) onto the multi-faceted rotating mirror mechanism (4); a cleaning table (5) for placing a workpiece to be cleaned is arranged below the multi-faceted rotating mirror mechanism (4); The multi-faceted rotating mirror mechanism (4) comprises a rotating mirror body (41), a rotating shaft (42) passing through the center of the rotating mirror body (41), and one end of the rotating shaft (42) is connected to a driving motor; A plurality of second reflecting mirrors (43) are arranged along the circumferential direction on the side wall of the rotating mirror body (41).

2. The rotating mirror-based multiple laser cleaning system according to claim 1, characterized in that: At least one second beam splitter (8) is arranged between the first beam splitter (3) and the first reflector (7).

3. The rotating mirror-based multiple laser cleaning system according to claim 1, characterized in that: The number of the second reflecting mirrors (43) is 5 to 8.

4. The rotating mirror-based multiple laser cleaning system according to claim 1, characterized in that: A field mirror assembly (6) for focusing is also provided between the multi-faceted rotating mirror mechanism (4) and the cleaning platform (5).

5. The rotating mirror-based multiple laser cleaning system according to claim 1, characterized in that: The rotation speed of the multi-faceted rotating mirror mechanism (4) is 1000-2000 r / m.

6. The rotating mirror-based multiple laser cleaning system according to claim 3, characterized in that: A laser film layer is provided on the outer surface of the second reflector (43).

7. The rotating mirror-based multiple laser cleaning system according to claim 4, characterized in that: The field lens assembly (6) comprises a first lens and a second lens which are arranged in parallel.

8. The rotating mirror-based multiple laser cleaning system according to claim 1, characterized in that: The first reflector (7) is arranged directly above the first beam splitter (3), and the first reflector (7) and the first beam splitter (3) are arranged in parallel, and the acute angles formed by the first beam splitter (3) and the first reflector (7) and the horizontal plane are both 45°.

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