High-power laser scanning system based on rotating mirror

Abstract

The utility model discloses a high-power laser scanning system based on a rotating mirror, which comprises a laser, a collimating mirror, a reflecting mirror, a rotating mirror and a field lens, the rotating mirror comprises eight rotating mirror reflecting surfaces, and the field angle of the field lens is 90 degrees. After the structures of the rotating mirror and the field lens are optimized, on the premise that the field angle of the field lens is ensured to be large enough, reflected light of the rotating mirror can be controlled to be projected into the field lens as much as possible, stray light is avoided to the maximum extent, and therefore it is ensured that the working face is large enough, the light utilization rate is improved, and the working efficiency is improved. And therefore, the working efficiency of laser cleaning is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of laser cleaning, relates to a high-power laser cleaning system, and specifically relates to a high-power laser scanning system based on a rotating mirror. Background Art

[0002] High-power laser cleaning systems are the development trend of cleaning application industries such as rust removal and paint removal. The rotating mirror type strong laser scanning output mechanism can greatly improve the working efficiency of the laser cleaning system, so it will definitely become the development trend of the scanning mechanism of the high-power laser cleaning system.

[0003] The laser cleaning system consists of a laser light source, a laser scanning head and auxiliary supporting modules. The laser scanning head converges a strong laser beam to the working surface and realizes a certain regular scanning at the same time. The convergence effect of the beam directly determines the cleaning effect of the action point, and the design of the scanning rules and curves has a direct impact on the overall cleaning effect of the working surface. The scanning speed has a direct impact on the overall scanning efficiency. Laser scanning technology is the core technology of the laser cleaning system. Therefore, strong laser scanning technology plays a very important role in the laser cleaning system. The design of the laser scanning head directly determines the application effect and efficiency of the system and is the core of the entire system. If the rotating mirror is applied to the laser scanning head, the laser scanning head can have a higher scanning speed, a wider working surface and a more uniform cleaning effect.

[0004] However, after the reflective surface of the rotating mirror is coated, there are gaps in the coatings of adjacent reflective surfaces of the rotating mirror (i.e., at the edges of the rotating mirror). When the incident light beam is projected onto the edges, the reflected light is difficult to control and there is a lot of stray light. It cannot be effectively projected onto the working surface or form an effective light spot, which in turn leads to a decrease in laser cleaning efficiency. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present utility model is to provide a high-power laser scanning system based on a rotating mirror, so as to solve the technical problem in the prior art that when the incident light beam of the high-power laser scanning system is projected onto the edge of the rotating mirror, the reflected light is difficult to control, resulting in a decrease in laser cleaning efficiency.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A high-power laser scanning system based on a rotating mirror comprises a laser for emitting a laser beam, and also comprises a collimating mirror, a reflecting mirror, a rotating mirror and a field mirror which are sequentially arranged along the propagation direction of the laser beam.

[0008] The rotating mirror is a hollow polygonal prism structure, the hollow part of the polygonal prism structure is the center hole of the rotating mirror, and the rotating mirror can rotate 360° with the center of the center hole of the rotating mirror as the rotation point; the multiple side surfaces of the polygonal prism are the rotating mirror reflection surfaces, and the rotating mirror reflection surfaces are planes.

[0009] The field angle of the field mirror and the number of the rotating mirror reflective surfaces satisfy the following formula I:

[0010]

[0011] Where:

[0012] ω represents the field angle of the field lens.

[0013] N represents the number of reflecting surfaces of the rotating mirror, and the value of N is 8.

[0014] The utility model also has the following technical features:

[0015] Specifically, the diameter of the laser beam emitted from the collimator, the diameter of the rotating mirror, and the number of the rotating mirror reflective surfaces must satisfy the following formula II:

[0016]

[0017] Where:

[0018] ε represents the efficiency of the collimated beam output beam.

[0019] ψ represents the diameter of the laser beam emitted from the collimator output mirror.

[0020] R represents the mirror diameter.

[0021] N represents the number of reflecting surfaces of the rotating mirror.

[0022] The high-power laser scanning system based on a rotating mirror also includes a rotating mirror mounting main shell, a field mirror mounting shell is mounted on the bottom of the rotating mirror mounting main shell, and a collimating mirror mounting shell is mounted on one side of the rotating mirror mounting main shell; a rotating mirror and a motor are fixedly mounted in the rotating mirror mounting main shell, and the motor shaft is mounted in the center hole of the rotating mirror.

[0023] A field mirror is fixedly installed in the field mirror installation shell, and the field mirror is located below the rotating mirror; a laser is fixedly installed in the top of the collimator mirror installation shell, and a collimator mirror and a reflector are fixedly installed in sequence in the collimator mirror installation shell below the laser; the collimator mirror is arranged along the horizontal direction.

[0024] The angle between the reflector and the horizontal direction is 45°.

[0025] A protective glass is installed in the field mirror installation shell, and the protective glass is located directly below the field mirror.

[0026] A first protective mirror is installed in the rotating mirror installation main housing. The first protective mirror is located above the field mirror and between the reflecting mirror and the rotating mirror.

[0027] A second protective mirror is installed in the rotating mirror installation main housing. The second protective mirror is located above the field mirror and below the reflecting surface of the rotating mirror away from the reflecting mirror.

[0028] The collimator comprises a collimator incident mirror and a collimator exit mirror, and the collimator exit mirror is located below the collimator incident mirror.

[0029] Compared with the prior art, the utility model has the following technical effects:

[0030] After the structures of the rotating mirror and the field mirror are optimized, the utility model can control the reflected light of the rotating mirror to be projected into the field mirror as much as possible while ensuring that the field angle of the field mirror is large enough, thereby avoiding the generation of stray light to the greatest extent, thereby ensuring that the working surface is large enough, and improving the light utilization rate, thereby improving the working efficiency of laser cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the internal structure of a high-power laser scanning system based on a rotating mirror; Figure 1 In the figure, the arrow indicates the propagation direction of the laser beam.

[0032] Figure 2 Schematic diagram of the external structure of a high-power laser scanning system based on a rotating mirror.

[0033] The meanings of the numbers in the figure are: 1-laser, 2-collimator mirror incident mirror, 3-collimator mirror output mirror, 4-reflector, 5-rotating mirror, 6-field mirror, 7-rotating mirror mounting main shell, 8-field mirror mounting shell, 9-collimator mirror mounting shell, 10-motor, 11-protective glass, 12-first protective mirror, 13-second protective mirror, 14-working surface.

[0034] 501- rotating mirror center hole, 502- rotating mirror reflection surface.

[0035] The specific contents of the utility model are further explained in detail below in conjunction with the embodiments. DETAILED DESCRIPTION

[0036] In the present utility model, "high power" refers to a maximum laser power ≥ 10000W.

[0037] It should be noted that, unless otherwise specified, all components in the present invention are components known in the art.

[0038] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of the present application fall within the protection scope of the present invention.

[0039] Example:

[0040] This embodiment provides a high-power laser scanning system based on a rotating mirror, such as Figure 1 As shown, it includes a laser 1 for emitting a laser beam, and also includes a collimator, a reflector 4, a rotating mirror 5 and a field lens 6 arranged in sequence along the propagation direction of the laser beam; the rotating mirror 5 is a hollow polygonal prism structure, the hollow part of the polygonal prism structure is the rotating mirror center hole 501, and the rotating mirror 5 can rotate 360° with the center of the rotating mirror center hole 501 as the rotation point; the multiple side surfaces of the polygonal prism are rotating mirror reflection surfaces 502, and the rotating mirror reflection surfaces 502 are planes. The field angle of the field lens 6 and the number of the rotating mirror reflection surfaces 502 satisfy the following formula I:

[0041]

[0042] Where:

[0043] ω represents the field angle of the field lens.

[0044] N represents the number of reflecting surfaces of the rotating mirror. When the value of N is 8, ω is 90°.

[0045] In this embodiment, when the structure of the rotating mirror 5 and the field lens 6 is optimized, if the number of the rotating mirror reflection surfaces 502 is small, the field angle of the field lens 6 becomes larger, the difficulty of design, processing and assembly increases, and at the same time, the coating process of the rotating mirror 5 becomes more difficult, and it is difficult to achieve high-power laser scanning; if the number of the rotating mirror reflection surfaces 502 is large, the field angle of the field lens 6 becomes smaller, and the scanning width is narrow, resulting in low efficiency. After the structure of the rotating mirror 5 and the field lens 6 is optimized by the above formula I, under the premise of ensuring that the field angle of the field lens is large enough, the reflected light of the rotating mirror 5 can be controlled to be projected into the field lens 6 as much as possible, and the generation of stray light is avoided to the greatest extent, thereby ensuring that the working surface 14 is large enough, the light utilization rate is high, and the working efficiency of laser cleaning is improved.

[0046] In this embodiment, the fiber output of the laser 1 generally has a large field of view, and the light beam output by the fiber laser needs to be collimated. The collimator mirror incident mirror 2 and the collimator mirror output mirror 3 can collimate the output light beam of the fiber laser, and then project the light beam onto the rotating mirror reflective surface 502. The rotating mirror 5 includes multiple reflective surfaces, which are driven to rotate by a motor. During the rotation process, the collimated strong laser beam is reflected from different positions and different angles to the scanning field mirror. During the rotation process of the rotating mirror, since the position of the incident collimated laser beam is fixed, the angle of the reflected light beam changes in real time with the rotation angle.

[0047] As a specific solution of this embodiment, the diameter of the laser beam emitted from the collimator mirror output mirror, the diameter of the rotating mirror and the number of the rotating mirror reflective surfaces need to satisfy the following formula II:

[0048]

[0049] Where:

[0050] ε represents the efficiency of the collimated beam output beam.

[0051] ψ represents the diameter of the laser beam emitted from the collimator output mirror.

[0052] R represents the mirror diameter.

[0053] N represents the number of reflecting surfaces of the rotating mirror, and the value of N is 8.

[0054] It can be seen from Formula II that the smaller the collimated beam diameter, the larger the rotating mirror diameter and the fewer the number of reflection surfaces, the higher the efficiency of the collimated beam output beam diameter.

[0055] As a specific solution of this embodiment, Figure 2 As shown, the high-power laser scanning system based on the rotating mirror also includes a rotating mirror mounting main shell 7, a field mirror mounting shell 8 is installed at the bottom of the rotating mirror mounting main shell 7, and a collimating mirror mounting shell 9 is installed on one side of the rotating mirror mounting main shell 7; a rotating mirror 5 and a motor 10 are fixedly installed in the rotating mirror mounting main shell 7, and the rotating shaft of the motor 10 is installed in the rotating mirror center hole 501; under the drive of the motor 10, the rotating mirror 5 can rotate 360° under the drive of the motor 10.

[0056] As a specific solution of this embodiment, Figure 1 and Figure 2 As shown, a field lens 6 is fixedly installed in a field lens mounting shell 8, and the field lens 6 is located below the rotating mirror 5; a laser 1 is fixedly installed in the top of a collimating lens mounting shell 9, and a collimating lens and a reflecting mirror 4 are fixedly installed in sequence in the collimating lens mounting shell 9 below the laser 1; the collimating lens is arranged along the horizontal direction; and the angle between the reflecting mirror 4 and the horizontal direction is 45°.

[0057] As a specific solution of this embodiment, Figure 1 and Figure 2 As shown, a protective glass 11 is installed in the field lens installation housing 8, and the protective glass 11 is located directly below the field lens 6. In this embodiment, during laser cleaning, dirt may splash on the object to be cleaned, and the protective glass 11 can prevent the dirt from entering the field lens installation housing 8, thereby avoiding damage to the field lens 6.

[0058] As a specific solution of this embodiment, Figure 1 and Figure 2As shown, a first protective mirror 12 is installed in the rotating mirror installation main housing 7, and the first protective mirror 12 is located above the field mirror 6 and between the reflector 4 and the rotating mirror 5. After structural optimization, the stray light is basically concentrated on the right side of the rotating mirror 5, and the first protective mirror 12 can reflect the stray light into the field mirror 6 to avoid heating inside the device.

[0059] As a specific and optional solution of this embodiment, Figure 1 and Figure 2 As shown, a second protective mirror 13 is installed in the rotating mirror mounting main housing 7, the second protective mirror 13 is located above the field mirror 6, and the second protective mirror 13 is located below the rotating mirror reflecting surface 502 away from the reflecting mirror 4. In this embodiment, the second protective mirror 13 can further reflect stray light into the field mirror 6, further avoiding heating inside the device.

[0060] As a specific solution of this embodiment, the material of the rotating mirror 5 is selected from optical materials such as quartz, or metal materials such as aluminum alloy.

[0061] The working process of the utility model is as follows:

[0062] First, when using a high-power laser scanning system based on a rotating mirror for laser cleaning, the main working parameters are designed as follows: the maximum laser power is 15000W; the maximum rotating mirror speed is 4000rpm; the maximum scanning width is 600mm; the rotating mirror has 8 reflective surfaces; the spot size is 0.7mm; the thermal control method is water cooling and liquid nitrogen cooling.

[0063] Second, place the target object to be cleaned in the working area of ​​the laser cleaning machine and start the laser 1 to generate a laser beam. After passing through the collimator lens incident mirror 2, collimator lens output mirror 3, reflector 4, rotating mirror 5 and field lens 6, the laser beam is projected onto the target object to be cleaned and interacts with the dirt, coating or impurities on its surface to achieve cleaning.

Claims

1. A high-power laser scanning system based on a rotating mirror, comprising a laser (1) for emitting a laser beam, characterized in that: It also includes a collimator mirror, a reflector (4), a rotating mirror (5) and a field mirror (6) which are arranged in sequence along the propagation direction of the laser beam; The rotating mirror (5) is a hollow polygonal prism structure, the hollow part of the polygonal prism structure is the rotating mirror center hole (501), and the rotating mirror (5) can rotate 360 ​​degrees with the center of the rotating mirror center hole (501) as the rotation point; the multiple side surfaces of the polygonal prism are rotating mirror reflection surfaces (502), and the rotating mirror reflection surfaces (502) are planes; The field angle of the field mirror (6) and the number of the rotating mirror reflection surfaces (502) satisfy the following formula I: Formula I; Where: ω represents the field angle of the field lens; N represents the number of reflecting surfaces of the rotating mirror, and the value of N is 8.

2. The high-power laser scanning system based on a rotating mirror as claimed in claim 1, characterized in that: The diameter of the laser beam emitted from the collimator, the diameter of the rotating mirror, and the number of the rotating mirror reflective surfaces must satisfy the following formula II: Formula II; Where: ε represents the efficiency of the collimated beam output beam; ψ represents the diameter of the laser beam emitted from the collimator output mirror; R represents the diameter of the rotating mirror; N represents the number of reflecting surfaces of the rotating mirror.

3. The high-power laser scanning system based on a rotating mirror as claimed in claim 1, characterized in that: It also comprises a rotating mirror mounting main housing (7), a field mirror mounting housing (8) being mounted on the bottom of the rotating mirror mounting main housing (7), and a collimating mirror mounting housing (9) being mounted on one side of the rotating mirror mounting main housing (7); a rotating mirror (5) and a motor (10) being fixedly mounted in the rotating mirror mounting main housing (7), and a rotating shaft of the motor (10) being mounted in a central hole (501) of the rotating mirror.

4. The high-power laser scanning system based on a rotating mirror as claimed in claim 3, characterized in that: A field mirror (6) is fixedly mounted in the field mirror mounting housing (8), and the field mirror (6) is located below the rotating mirror (5); a laser (1) is fixedly mounted in the top of the collimating mirror mounting housing (9), and a collimating mirror and a reflecting mirror (4) are fixedly mounted in sequence in the collimating mirror mounting housing (9) below the laser (1); the collimating mirror is arranged along the horizontal direction.

5. The high-power laser scanning system based on a rotating mirror as claimed in claim 1, characterized in that: The angle between the reflector (4) and the horizontal direction is 45°.

6. The high-power laser scanning system based on a rotating mirror as claimed in claim 3, characterized in that: A protective glass (11) is installed in the field mirror installation housing (8), and the protective glass (11) is located directly below the field mirror (6).

7. The high-power laser scanning system based on a rotating mirror as claimed in claim 3, characterized in that: A first protective mirror (12) is installed in the rotating mirror mounting main housing (7); the first protective mirror (12) is located above the field mirror (6); and the first protective mirror (12) is located between the reflecting mirror (4) and the rotating mirror (5).

8. The high-power laser scanning system based on a rotating mirror as claimed in claim 3, characterized in that: A second protective mirror (13) is installed in the rotating mirror mounting main housing (7), the second protective mirror (13) is located above the field mirror (6), and the second protective mirror (13) is located below a rotating mirror reflecting surface (502) away from the reflecting mirror (4).

9. The high-power laser scanning system based on a rotating mirror as claimed in claim 1, characterized in that: The collimator comprises a collimator incident mirror (2) and a collimator output mirror (3), wherein the collimator output mirror (3) is located below the collimator incident mirror (2).

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