A modular laser light guide arm and its assembly and debugging method and application

Abstract

The present invention relates to a modular laser light guide arm, an assembly and debugging method thereof, and an application in three-dimensional laser non-metallic processing, belonging to the field of laser processing technology. The light guide arm includes a two-axis reflector group, a light guide tube group, and a stress releaser in any combination. The assembly and debugging method is as follows: using an optical instrument to calibrate the reflector of the two-axis reflector group, assembling the light guide tube group and the stress releaser, and fine-tuning the optical path, and assembling the two-axis reflector group and the light guide tube group according to the optical path design. The present invention adopts a modular design, can freely build an optical path, and only needs to debug and calibrate a single module. The operation is simple, suitable for mass production, convenient for optical path problem investigation and on-site maintenance, the maintenance process is efficient and simple, and the operability is strong.

Description

Technical Field

[0001] The invention relates to a modular laser light guide arm and an assembly and debugging method and application thereof, belonging to the technical field of laser processing. Background Art

[0002] Existing 3D laser non-metal processing equipment typically consists of a laser, a light guide, a laser head, and a motion actuator. In particular, for the processing of complex non-metallic 3D parts, the processing equipment typically consists of a CO2 laser, a light guide arm, a laser head, and a six-axis robot. A 10.6µm wavelength CO2 laser is emitted by the laser, reflected by a multi-axis light guide arm, and transmitted to the laser head. The laser head then shapes the optical path and focuses it onto the part surface. The robot then drives the robot to achieve complex 3D processing.

[0003] The light guide arm is a good transmission solution for some lasers that cannot be transmitted by flexible optical fibers. The light guide arm consists of a reflective joint and a light guide tube. The technical core of the light guide arm lies in the correction of the optical path. In the existing technical solutions, the optical path correction of the light guide arm is usually performed on each joint after all the reflective joints and light guide tubes are assembled. For some industrial-grade high-power light guide arms, especially those with a very long arm span, debugging is very difficult. With long-term processing and use in the later stage, the light path of the light guide arm may drift due to abnormal conditions such as the movement of the robot or collision with the workpiece. The optical path of the entire light guide arm needs to be re-calibrated, which is a large workload and cannot be calibrated on site. It needs to be returned to the factory for maintenance, which takes a long time. This limits the application of light guide arms in the field of complex three-dimensional parts processing. Summary of the Invention

[0004] In view of this, the present invention provides a modular laser light guide arm and an assembly and debugging method and application thereof to solve the above-mentioned technical problems in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A modular laser light guide arm, comprising any combination of a two-axis reflector assembly, a light guide assembly, and a stress releaser, wherein the stress releaser is sleeved on the light guide assembly;

[0007] The two-axis reflector assembly includes a U-shaped tube, a reflector is provided at the outer inflection point of the U-shaped tube, the reflector forms an angle of 45° with the inner wall, and a high-rigidity bearing is provided at the inner inflection point of the U-shaped tube;

[0008] The light guide tube assembly includes a long tube and flanges arranged at both ends of the long tube;

[0009] The stress releaser includes two open hoops and a rotating ring seat. A universal ring and a rotating half ring are fixedly connected to the outer side wall of the rotating ring seat. A lubricating sheet is provided on the inner side wall of the rotating ring seat. The open hoops abut against the rotating ring seat.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the length of the long tube is 0 to 3 m, and the vertical parallelism of the two flanges at both ends of the long tube is not less than 0.02 mm, and the horizontal coaxiality is not less than 0.02 mm.

[0012] Furthermore, the number of the two-axis reflector groups is 1 to 10 groups, the number of the light guide tube groups is 0 to 5 groups, and the number of the stress releasers is 0 to 3 groups.

[0013] The present invention also provides an assembly and debugging method for the modular laser light guide arm, which comprises the following steps:

[0014] (1) Use optical instruments to calibrate the reflectors of the two-axis reflector assembly until the optical path and the axis of the high-rigidity bearing are parallel;

[0015] (2) Assemble the light guide tube assembly and stress release device, and fine-tune the light path;

[0016] (3) Assemble the two-axis reflector group and the light guide group according to the optical path design;

[0017] (4) If the optical path is offset during use, disassemble the laser head step by step from the end along the reverse direction of the optical path, use the red light indicator to find the problematic part, and replace it.

[0018] Furthermore, the fine-tuning operation is to precisely polish the flange so that the vertical parallelism of the two flanges at both ends of the long tube is not less than 0.02 mm and the horizontal coaxiality is not less than 0.02 mm.

[0019] The present invention also provides application of the modular laser light guide arm in three-dimensional laser non-metal processing.

[0020] The beneficial effects of the present invention are:

[0021] 1. Modular design concept, through arbitrary combination of modules, can easily complete the construction of optical path scheme according to actual working conditions;

[0022] 2. The modular design concept only requires debugging and calibration of a single module, which is simple to operate and suitable for mass production;

[0023] 3. The modular design concept facilitates optical path problem troubleshooting and on-site repairs, making the maintenance process efficient and simple with strong operability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the modular laser light guide arm structure of Example 1 of the present invention;

[0025] Figure 2 This is a cross-sectional view of the light guide assembly according to embodiment 1 of the present invention;

[0026] Figure 3 This is a structural diagram of a stress releaser according to embodiment 1 of the present invention;

[0027] Figure 4 This is a schematic diagram of the installation position of the lubricating sheet according to embodiment 1 of the present invention;

[0028] Figure 5 This is a structural diagram of Example 2 of the present invention.

[0029] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0030] 1. Two-axis reflector assembly, 2. Light guide assembly, 201. Long tube, 202. Flange, 202A. Vertical flange surface, 202B. Horizontal flange surface, 3. Stress releaser, 301. Universal lifting ring, 302. Rotating ring seat, 303. Rotating half ring, 304. Open clamp, 305. Lubricating sheet. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0032] In the following embodiments, the length of the long tube 201 is 0 to 3 m, the vertical surfaces 202A of the two flanges 202 at both ends of the long tube 201 have a parallelism of not less than 0.02 mm, and the horizontal surfaces 202B have a coaxiality of not less than 0.02 mm.

[0033] The number of the two-axis reflector groups 1 is 1 to 10, the number of the light guide tube groups 2 is 0 to 5, and the number of the stress releasers 3 is 0 to 3.

[0034] Example 1

[0035] like Figures 1 to 4 As shown, the modular laser light guide arm includes three sets of two-axis reflector groups 1, two sets of light guide tube groups 2 and one set of stress releaser 3. The stress releaser 3 is sleeved on the light guide tube group 2.

[0036] The two-axis reflector assembly 1 comprises a U-shaped tube, a reflector is provided at the outer inflection point of the U-shaped tube, the reflector forms an angle of 45° with the inner wall, and a high-rigidity bearing is provided at the inner inflection point of the U-shaped tube;

[0037] The light guide tube assembly 2 includes a long tube 201 and flanges 202 provided at both ends of the long tube 201;

[0038] The stress releaser 3 includes two open hoops and a rotating ring seat 302 . A universal ring 301 and a rotating half ring 303 are fixedly connected to the outer wall of the rotating ring seat 302 . A lubricating sheet 305 is provided on the inner wall of the rotating ring seat 302 . The open hoops abut against the rotating ring seat 302 .

[0039] Example 2

[0040] like Figure 5 As shown, the modular laser light guide arm includes four groups of two-axis reflector groups 1.

[0041] Example 3

[0042] The assembly and debugging method of the modular laser light guide arm in Example 1 comprises the following steps:

[0043] (1) Using an optical instrument, calibrate the reflector of the two-axis reflector assembly 1 until the optical path and the axis of the high-rigidity bearing are parallel;

[0044] (2) Assemble the light guide assembly 2 and the stress release 3, and precisely polish the flange 202 so that the vertical surfaces 202A of the two flanges 202 at both ends of the long tube 201 are parallel to each other by no less than 0.02 mm, and the horizontal surfaces 202B are coaxial to each other by no less than 0.02 mm;

[0045] (3) Assemble the two-axis reflector group 1 and the light guide group 2 according to the optical path design;

[0046] (4) If the optical path is offset during use, disassemble the laser head step by step from the end along the reverse direction of the optical path, use the red light indicator to find the problematic part, and replace it.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A modular laser light guide arm, characterized in that: It includes any combination of a two-axis reflector group, a light guide group and a stress releaser, wherein the stress releaser is sleeved on the light guide group; The two-axis reflector assembly includes a U-shaped tube, a reflector is provided at the outer inflection point of the U-shaped tube, the reflector forms an angle of 45° with the inner wall, and a high-rigidity bearing is provided at the inner inflection point of the U-shaped tube; The light guide tube assembly includes a long tube and flanges arranged at both ends of the long tube; The stress releaser includes two open hoops and a rotating ring seat. A universal ring and a rotating half ring are fixedly connected to the outer side wall of the rotating ring seat. A lubricating sheet is provided on the inner side wall of the rotating ring seat. The open hoops abut against the rotating ring seat.

2. The modular laser light guide arm according to claim 1, characterized in that: The length of the long tube is ≤3m, and the vertical parallelism of the two flanges at both ends of the long tube is not less than 0.02mm, and the horizontal coaxiality is not less than 0.02mm.

3. The modular laser light guide arm according to claim 1, characterized in that: The number of the two-axis reflector groups is 1 to 10, the number of the light guide tube groups is 1 to 5, and the number of the stress releasers is 1 to 3.

4. A method for assembling and debugging a modular laser light guide arm according to any one of claims 1 to 3, characterized in that: Here are the steps: (1) Use optical instruments to calibrate the reflectors of the two-axis reflector group until the optical path and the axis of the high-rigidity bearing are parallel; (2) Assemble the light guide tube assembly and stress release device, and fine-tune the light path; (3) Assemble the two-axis reflector group and light guide group according to the optical path design; (4) If the optical path is offset during use, disassemble the laser head step by step from the end in the opposite direction of the optical path, use the red light indicator to find the problematic part, and replace it.

5. The method for assembling and debugging a modular laser light guide arm according to claim 4, characterized in that: The fine-tuning operation is to precisely polish the flange so that the vertical parallelism of the two flanges at both ends of the long tube is not less than 0.02 mm and the horizontal coaxiality is not less than 0.02 mm.

6. Application of the modular laser light guide arm according to any one of claims 1 to 3 in three-dimensional laser non-metal processing.

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