Laser cutting device capable of conveniently measuring focus

Abstract

The utility model provides a laser cutting device facilitating focus measurement. The laser cutting device comprises a laser output head, a collimating mirror, a focusing mirror, a reflector module assembly, a nozzle, an incident outer light source module, photographic paper and a camera module. The collimating mirror, the focusing mirror, the incident external light source module and the camera module are collinearly arranged; a laser beam emitted by the laser output head passes through the collimating mirror, the focusing mirror and the reflecting mirror module and is emitted by the nozzle; the photographic paper is arranged close to the camera module; the incident outer light source module is arranged far away from the camera module, and the photographic paper is provided with an image of a laser beam focus; and the collimating mirror is connected with a motor for adjusting the horizontal position of the collimating mirror. The device can detect the focus in the laser cutting process and provide a focus compensation mode, so that the laser cutting process meets the technological requirements.

Description

Technical Field

[0001] The utility model belongs to the technical field of laser cutting, and in particular relates to a laser cutting device which is convenient for measuring focus. Background Art

[0002] With the continuous development of laser cutting technology and the changes in market demand, laser cutting machines have been increasingly widely used due to their advantages of fast cutting speed and high cutting accuracy. Laser cutting machines use the high-power-density laser beam generated by the laser to form a very small light spot with extremely high power density, i.e., the focus, through the collimation and focusing of the collimator and focusing lens.

[0003] During the laser cutting process, the focus is controlled to irradiate the material position for heating, so that the material can be quickly melted, vaporized or burned. Therefore, the focus quality is an important factor affecting the cutting quality. Since the optical lens is made of quartz, the temperature generated during the cutting process will cause the lens to deform, causing the lens deflection to change and thus affecting the position of the focus, resulting in poor cutting effect.

[0004] If you want to get a better cutting effect, you need to adjust the focus position so that the theoretical focus and the actual focus are consistent. The current method of adjusting the focus position is to obtain the theoretical focus position through theoretical calculation, collect the ambient temperature through the temperature sensor, and then compensate the focus position according to the relationship between the ambient temperature and the focus offset. However, the position collected by the ambient temperature sensor cannot reflect the temperature information of the cutting position, and the detection accuracy is inaccurate, the detection causes a large error, and the temperature of the cutting point cannot be obtained in real time, and the state of the focus cannot be detected, which affects the quality of laser cutting. Utility Model Content

[0005] The utility model provides a laser cutting device which is convenient for measuring focus. The device can detect the focus of the laser cutting process and provide a focus compensation method so that the laser cutting process meets the process requirements.

[0006] The device comprises: a laser output head, a collimating lens, a focusing lens, a reflector module assembly, a nozzle and a focus measurement assembly for detecting a focus position;

[0007] The collimating mirror, focusing mirror and focus measuring component are arranged in a colinear manner;

[0008] The laser beam emitted by the laser output head passes through the collimator, focusing lens and reflector module assembly and is emitted from the nozzle;

[0009] The collimator is connected to a motor for adjusting the horizontal position of the collimator and thus adjusting the focal position.

[0010] It should be further explained that the focus measurement component includes: an incident external light source module, a photographic paper, and a camera module;

[0011] The camera module is arranged close to the laser output head, and the photographic paper is arranged close to the camera module; the incident external light source module is arranged far away from the camera module, and the collimator, focusing lens, incident external light source module and camera module are arranged in the same line; the photographic paper is used to image the focus of the laser beam.

[0012] It should be further explained that the reflector module assembly is provided with a first reflector module and a second reflector module and a third reflector module which are arranged in parallel with each other;

[0013] The second reflector module and the third reflector module are arranged between the focusing mirror and the nozzle;

[0014] The laser beam emitted by the laser output head is reflected by the first reflector module and then passes through the collimating lens and the focusing lens.

[0015] It should be further explained that it also includes: body;

[0016] The camera module is installed near the top of the machine body; a pressing cylinder and a pressing ring are arranged on the machine body near the camera module; the photo paper is pressed and held on the pressing cylinder by the pressing ring.

[0017] It should be further explained that a first filter is installed on the pressing cylinder, and the first filter is arranged away from the camera module.

[0018] It should be further explained that an incident external light source module is arranged near the bottom of the body; the incident external light source module is provided with an incident light group and a second filter.

[0019] It should be further explained that the top of the first reflector module is provided with an incident external light source penetration hole, the side of the first reflector module is provided with a laser beam incident hole, and the bottom of the first reflector module is provided with a laser beam exit hole;

[0020] The top of the first reflector module is connected to the bottom end of the pressing cylinder, the side of the first reflector module is connected to the laser beam output end of the laser output head, and the bottom of the first reflector module is connected to the collimating mirror.

[0021] It should be further explained that the reflector mold assembly is also provided with a reflection adjustment seat, and the reflection adjustment seat is provided with a fixing plate, and the fixing plate is connected to the body of the laser cutting machine through a rectangular spring;

[0022] A reflector mounting tube is arranged on one side of the fixed plate, the reflector module is mounted on the reflector mounting tube, and the interior of the reflector mounting tube is a circular channel.

[0023] The reflector module is installed on the reflector mounting tube in a manner that the reflector module is at an angle of 0 to the vertical plane.

[0024] It should be further explained that a cooling mechanism is provided on the other side of the fixed plate.

[0025] It should be further explained that a protective mirror and a bottom kit are provided at the laser beam output end of the machine body; and the nozzle is provided at the bottom of the bottom kit.

[0026] It can be seen from the above technical solutions that the utility model has the following advantages:

[0027] In the laser cutting device that is convenient for measuring the focus provided by the utility model, the external light source emitted by the incident external light source module sequentially passes through the second reflector group, the focusing mirror, the collimator, the first reflector group, and the photo paper until the photo is presented in the camera module, which plays the role of focus detection. Moreover, the cutting process can be monitored in real time through the camera module, and the position of the focus at each moment can be detected. The operator can adjust the collimator in time, and then adjust the focus, which can effectively solve the problem that the focus state cannot be timely learned in the prior art, and when an abnormality occurs, it cannot be effectively adjusted, affecting the quality of laser cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 Schematic diagram of laser cutting device for easy measurement of focus;

[0030] Figure 2 A schematic diagram of an embodiment of a laser cutting device for facilitating the measurement of focus;

[0031] Figure 3 This is a schematic diagram of an embodiment of a machine body involved in the utility model;

[0032] Figure 4 Schematic diagram of the reflector module assembly.

[0033] Description of reference numerals:

[0034] 1. Laser output head, 2. First reflector module, 3. Collimating lens, 4. Focusing lens, 5. Second reflector module, 6. Third reflector module, 7. Protective lens, 8. Bottom kit, 9. Nozzle, 10. Incident external light source module, 11. Camera module, 12. Cooling mechanism, 13. Rectangular spring, 14. Reflector, 15. Circular channel, 16. Incident light group, 17. Second filter, 18. First filter, 19. Photo paper, 20. Pressing ring, 21. Machine body, 22. Pressing cylinder. DETAILED DESCRIPTION

[0035] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0036] like Figure 1 As shown, the laser cutting device provided by the utility model for convenient focus measurement comprises: a laser output head 1, a collimating lens 3, a focusing lens 4, a reflector module assembly, a nozzle 9 and a focus measurement assembly for detecting the focus position.

[0037] Exemplarily, the focus measurement assembly includes: an incident external light source module 10 , a photographic paper 19 and a camera module 11 .

[0038] The collimator 3 , the focusing lens 4 , the incident external light source module 10 and the camera module 11 are arranged in a colinear manner; the laser beam emitted by the laser output head 1 passes through the collimator 3 , the focusing lens 4 and the reflector module assembly and is emitted from the nozzle 9 .

[0039] It should be noted that the laser beam emitted by the laser output head 1 can be first reflected by the reflector module assembly, then pass through the collimator 3 and the focusing lens 4, and then reflected by the reflector module assembly, and then emitted through the nozzle 9. In this way, the laser beam emitted by the laser output head 1 is respectively arranged vertically on the same line between the collimator 3, the focusing lens 4, the incident external light source module 10 and the camera module 11.

[0040] In another way, the laser beam emitted by the laser output head 1 passes through the collimator 3 and the focusing lens 4, is then reflected by the reflector module assembly, and is emitted through the nozzle 9. In this way, the laser output head 1, the collimator 3, the focusing lens 4, the incident external light source module 10, the photographic paper 19, and the camera module 11 are arranged in a colinear manner.

[0041] In order to detect and obtain the focus information during the laser cutting process, the photographic paper 19 is placed close to the camera module 11 ; the incident external light source module 10 is placed away from the camera module 11 , and an image of the laser beam focus is presented on the photographic paper 19 .

[0042] The utility model can adjust the focal position. Specifically, the collimator 3 is connected to a motor for adjusting the horizontal position of the collimator 3 so that the center of the collimator 3 is collinear with the laser beam. By controlling the motor, the collimator 3 is moved horizontally, and the focal position can be adjusted to meet the needs of the laser cutting process.

[0043] The following further describes the arrangement of the laser beam emitted by the laser output head 1 and the collimating lens 3 , the focusing lens 4 , the incident external light source module 10 and the camera module 11 in a collinear and perpendicular manner.

[0044] like Figures 2 to 4 As shown, in the embodiment of the utility model, the laser cutting device further includes: a body 21; a camera module 11 is installed near the top of the body 21; a pressing cylinder 22 and a pressing ring 20 are arranged on the body 21 near the camera module 11; and the photo paper 19 is pressed on the pressing cylinder 22 by the pressing ring 20. A first filter 18 is installed on the pressing cylinder 22, and the first filter 18 is arranged away from the camera module 11.

[0045] In this embodiment, an incident external light source module 10 is arranged near the bottom of the body 21; the incident external light source module 10 is provided with an incident light group 16 and a second filter 17. The incident light group 16 of this embodiment is used as external light, and the external light passes through the second filter 17, the first filter 18 and the second filter 17 respectively to filter out the messy light and prevent external dust from entering the cutting head.

[0046] In this embodiment, the reflector module assembly is provided with a first reflector module 2 and a second reflector module 5 and a third reflector module 6 which are arranged parallel to each other; the second reflector module 5 and the third reflector module 6 are arranged between the focusing mirror 4 and the nozzle 9; the laser beam emitted by the laser output head 1 is reflected by the first reflector module 2 and then passes through the collimating mirror 3 and the focusing mirror 4.

[0047] It should be noted that the first reflector module 2, the second reflector module 5 and the third reflector module 6 are all arranged at an angle of 45° to the vertical plane, so that the first reflector module 2, the second reflector module 5 and the third reflector module 6 play a reflecting role.

[0048] It should be noted that a first reflection adjustment seat is provided near the laser output head 1, and the first reflection adjustment seat is used to fix and install the first reflector module 2. A second reflection adjustment seat is provided between the focusing mirror 4 and the nozzle 9, and the second reflection adjustment seat is used to fix and install the second reflector module 5 and the third reflector module 6.

[0049] In this embodiment, a penetration hole for incident external light source is arranged on the top of the first reflection adjustment seat on which the first reflection mirror module 2 is installed, a laser beam incident hole is arranged on the side of the first reflection adjustment seat, and a laser beam exit hole is arranged on the bottom of the first reflection adjustment seat; the top of the first reflection adjustment seat is connected to the bottom end of the pressing cylinder 22, the side of the first reflection adjustment seat is connected to the laser beam output end of the laser output head 1, and the bottom of the first reflection adjustment seat is connected to the collimating mirror 3.

[0050] As for the installation position of the nozzle 9 , a protective mirror 7 and a bottom kit 8 are provided at the laser beam emission end of the body 21 ; the nozzle 9 is provided at the bottom of the bottom kit 8 .

[0051] In order to effectively install and fix the first reflector module 2, the second reflector module 5 and the third reflector module 6 to the machine body 21. The reflector module assembly is also provided with a reflection adjustment seat, and the reflection adjustment seat is provided with a fixing plate, and the fixing plate is connected to the machine body 21 of the laser cutting machine through a rectangular spring 13; a reflector mounting cylinder is provided on one side of the fixing plate, and a cooling mechanism 12 is provided on the other side of the fixing plate, which can cool the reflector.

[0052] It should be noted that the first reflector module 2 is set at an angle of 45° so that the light beam emitted from the laser output head can vertically enter the collimator 3. The role of the rectangular spring 13 is to adjust the position of the reflector by compressing the rectangular spring and then fine-tune the angle of the light beam entering the reflector, which can adjust the focus and the laser beam to meet the process requirements of laser cutting. The specific adjustment method can be manually adjusted, and the specific adjustment method is not limited.

[0053] For the light beam vertically incident on the collimating mirror 3, after being focused by the focusing mirror 4, it is incident on the second reflector group 5, so that the light beam is reflected 90° to the third reflector group. Similarly, after passing through the third reflector, the light beam is reflected 90° again, so that the light beam can pass through the bottom kit in parallel; the second reflector and the third reflector are provided with a rectangular spring on the reflector module like the first reflector, and the position of the reflector is adjusted by compressing the rectangular spring, thereby fine-tuning the angle of the light beam incident on the reflector; there is a cooling mechanism on the reflector module to cool the reflector.

[0054] In this embodiment, the reflector module is mounted on the reflector mounting tube, and the interior of the reflector mounting tube is a circular channel 15. In this way, the light beam passing through the filter can pass through the circular channel 15, and then pass through the focusing lens 4 and the collimating lens 3 in sequence, and then the external light beam passes through the circular channel of the first reflector group, and the external light beam is projected onto the photographic paper 19, and then captured by the camera module 11. The photographic paper 19 is fixed by the pressing cylinder 22 and the pressing ring 20 to prevent it from loosening.

[0055] One implementation method of this embodiment is: the laser output head emits a laser beam, and the laser beam emitted by the laser output head is reflected by the first optical path through the first reflector module. The light after the first reflection passes through the collimator and the focusing mirror, and the focused light spot is reflected by the second reflector module and the third reflector module in turn. Finally, the light beam passes through the protective mirror, the bottom kit, and the nozzle. During the transmission of the laser beam, the incident external light source module passes through the second reflector module, the collimator, the focusing mirror, and the first reflector module in turn, and is captured by the camera module to detect the focus of the laser cutting process. The detection results can be displayed, and of course, the focus can be adjusted according to actual needs. The adjustment method can be achieved by moving the collimator 3 to a horizontal position. The focus position is also adjusted by adjusting the reflector module through the rectangular spring 13, and the specific adjustment method is not limited.

[0056] Based on the above-mentioned laser cutting device, the specific working process may also include the following methods:

[0057] The laser beam output by the laser output head passes through the reflector of the first reflector module, vertically passes through the collimator and the focusing lens, and the focused light beam passes through the second reflector module, where the light beam is reflected 90°, and then enters the third reflector module. After being reflected 90° by the third reflector module, the light beam vertically passes through the lower protective mirror and passes through the bottom kit.

[0058] As for the focus detection method, the external light source emitted by the incident external light source module sequentially passes through the second reflector group, the focusing mirror, the collimating mirror, the first reflector group, and the photo paper until the image is presented in the camera module 11, which plays the role of focus detection. When the focus is exactly the theoretical focus, the camera will present a smaller image. As the temperature rises, the focus drifts, and the size of the image presented by the camera will change. At this time, the operator can learn about the change state based on the display screen of the laser cutting machine. According to the difference between the size of the image presented by the theoretical focus and the size of the image presented by the actual focus, the motor can be controlled to drive the collimating mirror to move, thereby changing the position of the focus and performing real-time compensation for the focus, thereby meeting the requirements of the cutting process.

[0059] It should be understood that when a certain element or layer is said to be "on" another element or layer, "connected" or "coupled" to another element or layer, the laser cutting device provided by the utility model, which is convenient for measuring focus, may be directly on another element or layer, directly connected or coupled to the other element or layer, or there may be an intermediate element or layer. On the contrary, when a certain element is said to be "directly on" another element or layer, "directly connected" or "directly coupled" to another element or layer, there is no intermediate element or layer. Similar numbers in all drawings indicate similar elements. As used herein, the term "and / or" includes any and all combinations of one or more of the relevant listed items.

[0060] The laser cutting device provided by the utility model for facilitating the measurement of focus may use spatially relative terms for convenience of description, such as "under", "below", "lower", "above", "above", etc. to describe the relationship between one element or feature and another element or feature as shown in the figure. It should be understood that the spatially relative terms are intended to include different orientations of the device in use or work other than the orientation shown in the figure. For example, if the device in the figure is turned over, the elements described as "under" or "below" other elements or features will face "above" other elements or features. Thus, the exemplary term "below" can include both above and below orientations. The device can be made to take other orientations (rotated 90 degrees or other orientations), and the spatially relative terms used here are interpreted accordingly.

[0061] The terms "first", "second", "third", "fourth", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects if they exist, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0062] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A laser cutting device that is convenient for measuring focus, characterized in that: include: A laser output head (1), a collimating lens (3), a focusing lens (4), a reflector module assembly, a nozzle (9), and a focus measurement assembly for detecting a focus position; The collimating mirror (3), the focusing mirror (4) and the focus measurement component are arranged in a collinear manner; The laser beam emitted by the laser output head (1) passes through the collimator (3), the focusing lens (4) and the reflector module assembly, and is emitted from the nozzle (9); The collimator (3) is connected to a motor for adjusting the horizontal position of the collimator (3) and thus adjusting the focal position.

2. The laser cutting device for facilitating focus measurement according to claim 1, characterized in that: The focus measurement component comprises: an incident external light source module (10), photographic paper (19) and a camera module (11); The camera module (11) is arranged close to the laser output head (1), and the photographic paper (19) is arranged close to the camera module (11); the incident external light source module (10) is arranged away from the camera module (11), and the collimator (3), the focusing lens (4), the incident external light source module (10) and the camera module (11) are arranged in a colinear manner; The photographic paper (19) is used to present an image of the focus of the laser beam.

3. The laser cutting device for facilitating focus measurement according to claim 1, characterized in that: The reflector module assembly is provided with a first reflector module (2) and a second reflector module (5) and a third reflector module (6) which are arranged parallel to each other; The second reflector module (5) and the third reflector module (6) are arranged between the focusing mirror (4) and the nozzle (9); The laser beam emitted by the laser output head (1) is reflected by the first reflector module (2) and then passes through the collimator (3) and the focusing lens (4).

4. The laser cutting device for facilitating focus measurement according to claim 3, characterized in that: Also includes: Body (21); The camera module (11) is installed near the top of the body (21); a pressing cylinder (22) and a pressing ring (20) are arranged on the body (21) near the camera module (11); and the photo paper (19) is pressed and held on the pressing cylinder (22) by the pressing ring (20).

5. The laser cutting device for facilitating focus measurement according to claim 4, characterized in that: A first optical filter (18) is mounted on the pressing cylinder (22), and the first optical filter (18) is arranged at a side away from the camera module (11).

6. The laser cutting device for facilitating focus measurement according to claim 4, characterized in that: An incident external light source module (10) is arranged near the bottom of the body (21); The incident external light source module (10) is provided with an incident light group (16) and a second filter (17).

7. The laser cutting device for facilitating focus measurement according to claim 3, characterized in that: The top of the first reflector module (2) is provided with an incident external light source penetration hole, the side of the first reflector module (2) is provided with a laser beam incident hole, and the bottom of the first reflector module (2) is provided with a laser beam exit hole; The top of the first reflector module (2) is connected to the bottom of the pressing cylinder (22), the side of the first reflector module (2) is connected to the laser beam output end of the laser output head (1), and the bottom of the first reflector module (2) is connected to the collimating mirror (3).

8. The laser cutting device for facilitating focus measurement according to claim 1 or 2, characterized in that: The reflector mold assembly is also provided with a reflection adjustment seat, and the reflection adjustment seat is provided with a fixing plate, and the fixing plate is connected to the body (21) of the laser cutting machine through a rectangular spring (13); A reflector mounting tube is provided on one side of the fixed plate, the reflector module is mounted on the reflector mounting tube, and the interior of the reflector mounting tube is a circular channel (15).

9. The laser cutting device for facilitating focus measurement according to claim 8, characterized in that: The reflector module is mounted on the reflector mounting tube at 45° to the vertical plane; A cooling mechanism (12) is provided on the other side of the fixed plate.

10. The laser cutting device for facilitating focus measurement according to claim 4, characterized in that: A protective mirror (7) and a bottom kit (8) are provided at the laser beam output end of the machine body (21); The nozzle (9) is arranged at the bottom of the bottom sleeve (8).

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