A laser head and its fault point judgment method and system

Abstract

The present invention relates to a laser head, which comprises a laser head body. The laser head body includes a laser and an optical path adjustment lens group. The laser emitted by the laser is converged at a point after passing through the optical path adjustment lens group. A thermal imaging component is also installed on the laser head body. The thermal imaging component includes a thermal imaging acquisition piece and a data processing module electrically connected to the thermal imaging acquisition piece. The thermal imaging acquisition piece acquires the thermal imaging size data of the incident surface of the optical path adjustment lens group and transmits it to the data processing module. It also includes a method and a system for judging the fault point of the laser head. During the working process of the laser head, the thermal imaging component installed on the laser head performs thermal imaging on the mirror surface temperature difference caused by the laser beam. By comparing the thermal imaging size data with the set size threshold, it is judged whether the divergence angle of the laser beam increases, so as to quickly judge whether the problem of poor optical processing quality is caused by the laser or the optical path adjustment lens group of the laser head, improve the efficiency of problem-solving and reduce the maintenance cost.

Description

Technical Field

[0001] The present invention relates to the field of laser heads, and more specifically, to a laser head, a method and a system for judging a fault point thereof. Background Art

[0002] In the current field of laser cutting, a fiber laser and an optical path adjusting lens group are installed on the laser head. The beam of the fiber laser emits from the fiber head at a certain divergence angle, and then the divergent beam is converged by the optical path adjusting lens group and acts on the plate to be processed, and melting and evaporation are realized for processing. Taking the ten-thousand-watt laser cutting as an example, in practical applications, we found that when the laser M2 factor (10 ≤ M2 ≤ 12), the quality of laser processing is better, and the processing quality will become worse if it is too large or too small. Therefore, when designing the optical path of the current laser head, the maximum laser divergence angle of the laser is adapted as the optical path design requirement for the light passing aperture of the laser head.

[0003] After the laser head is used for a period of time, poor light processing quality may occur. There are two reasons for the poor light processing quality. One is that when the beam quality of the laser deteriorates, the laser divergence angle will become larger, resulting in poor light processing quality after convergence; the other is that the optical path adjusting lens group of the laser head is contaminated or the coating is damaged, which will also result in poor light processing quality after convergence. Poor light processing quality caused by any reason will lead to the problem of high temperature or even burning inside the laser head. When the laser cutting equipment has poor light processing quality and causes an abnormality of high temperature inside the laser head, it is impossible to quickly determine whether the problem is with the laser or the laser head, resulting in an increase in the problem handling cycle and cost. However, the existing divergence angle detection methods all determine the divergence angle of the laser before the laser is used, lacking the divergence angle detection means during use. Summary of the Invention

[0004] The present invention aims to overcome the problem that it is difficult to judge the fault point of the laser head in the above-mentioned prior art, and provides a laser head, a method and a system for judging a fault point thereof.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a laser head, including a laser head body, the laser head body includes a laser and an optical path adjusting lens group, the laser emitted by the laser passes through the optical path adjusting lens group and converges at a point, and a thermal imaging component is further installed on the laser head body; the thermal imaging component includes a thermal imaging acquisition part and a data processing module electrically connected to the thermal imaging acquisition part, and the thermal imaging acquisition part acquires the thermal imaging size data of the incident surface of the optical path adjusting lens group and transmits it to the data processing module.

[0006] In the above scheme, during the operation of the laser processing equipment, the laser beam emitted by the laser will pass through the optical path adjustment lens group and cause an obvious temperature difference on a mirror surface closest to the laser. Specifically, the temperature will be higher within the range of the divergence angle of the light beam. The thermal imaging acquisition component collects the thermal imaging size data formed by the temperature difference on the mirror surface in real time and outputs it to the data processing module. The data processing module compares the thermal imaging size data with the set threshold. If it is greater than the set threshold, it can quickly determine that the laser beam quality has deteriorated and the laser divergence angle has increased.

[0007] Preferably, the laser head body also includes a detection mirror, and the detection mirror is located between the laser and the optical path adjustment mirror group, and the thermal imaging acquisition component collects the heat of the detection mirror and transmits it to the data processing module. The light beam emitted by the laser will pass through the detection mirror and will cause a temperature difference on the detection mirror, specifically, the temperature will be higher within the range of the divergence angle of the light beam. A detection mirror is added between the laser and the optical path adjustment mirror group, and the detection mirror is a plane lens. The light beam passes through the detection mirror first, and the detection mirror will not affect the optical path. At the same time, the high temperature of the light beam can occur on the detection mirror first through the action of the plane lens, thereby providing a certain degree of protection for the optical path adjustment mirror group.

[0008] Preferably, the laser and the thermal imaging acquisition component are both installed at the top of the laser head; the angle between the thermal imaging acquisition component and the incident surface of the detection mirror is acute. After the thermal imaging acquisition component can be located above the detection mirror and form a certain angle with the incident surface of the detection mirror, the thermal imaging acquisition component can directly collect the thermal imaging size data on the detection mirror without the need for other components to convert, so that the laser head will not cause too much change in volume due to the need to collect thermal imaging data, and the normal operation of the laser head will not be affected.

[0009] Preferably, the thermal imaging acquisition component is an infrared thermal imaging collector, and the distance between the acquisition end of the thermal imaging acquisition component and the detection mirror is the focal length of the thermal imaging acquisition component, so that the dimensional data collected by the thermal imaging acquisition component is more accurate.

[0010] Preferably, the data processing module includes a data acquisition unit, a storage unit, a processor unit, and an alarm unit; the processor unit is electrically connected to the data acquisition unit, the storage unit, and the alarm unit respectively; the storage unit stores standard data. After the data acquisition unit collects the data of the thermal imaging acquisition component, the processor compares the standard data stored in the storage unit with the collected data and outputs the electrical signal of the comparison result to the alarm unit. The storage unit storing the standard data is the threshold value set for the thermal imaging size. This standard data has different values for different lasers. According to the corresponding laser model, when making a comparison, the corresponding set threshold value is selected. The processor judges the comparison result as being greater than the set threshold value or not greater than the set threshold value, and thus outputs a high-level or low-level signal to the alarm unit respectively to trigger the alarm unit. The alarm unit can be connected to an alarm or a laser processing machine tool to give an operator a reminder.

[0011] A method for judging the fault point of a laser head, a thermal imaging device is provided on the laser head and a detection mirror is provided at the output end of the laser; the thermal imaging size data of the incident mirror surface of the detection mirror is collected by the thermal imaging device; the collected thermal imaging size data is compared with a set threshold value. If it is greater than the set threshold value, it indicates that the laser has a fault.

[0012] In the above technical solution, by comparing the collected thermal imaging size data of the detection mirror with the set size threshold value, it can be known whether the divergence angle of the laser beam emitted by the laser increases, so as to judge whether the beam quality of the laser deteriorates. If the divergence angle of the laser beam emitted by the laser increases, it is confirmed that the poor light processing quality is caused by a fault of the laser. Otherwise, it is a fault of the internal optical path adjustment mirror group of the laser head.

[0013] A laser head fault point judgment system for implementing the above laser head fault point judgment method; includes a laser head and a controller; the laser head includes a thermal imaging device and a laser, a detection mirror, and an optical path adjustment mirror arranged in sequence; the input end of the controller is electrically connected to the output end of the thermal imaging device, the controller includes an acquisition unit, a judgment unit, and an output unit. After the acquisition unit collects the thermal imaging size data, it is compared with the set threshold value by the judgment unit, and the output unit outputs the electrical signal of the comparison result as an alarm signal.

[0014] Preferably, it further includes an alarm, the input end of the alarm is electrically connected to the output end of the controller, and the output unit outputs the electrical signal of the comparison result to the alarm.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: during the operation of the laser head, the thermal imaging component installed on the laser head performs thermal imaging on the mirror temperature difference caused by the laser beam. By comparing the thermal imaging size data with the set size threshold, it is determined whether the divergence angle of the laser beam increases, so as to quickly determine whether the problem of poor optical processing quality is caused by the laser or the optical path adjustment lens group of the laser head, improving the efficiency of problem-solving and reducing the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a laser head of the present invention;

[0017] Figure 2 is a schematic diagram of the principle of a laser head of the present invention;

[0018] Figure 3 is a schematic structural diagram of a laser head fault point judgment system of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The drawings are only for illustrative purposes and should not be construed as limiting the patent; for better illustration of this embodiment, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationships described in the drawings are only for illustrative purposes and should not be construed as limiting the patent.

[0020] In the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as limiting the patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] The technical solutions of the present invention will be further specifically described below through specific embodiments and in conjunction with the drawings:

[0022] Embodiment 1

[0023] As Figure 1Shown is a laser head, which includes a laser head body 1. The laser head body 1 includes a laser 2 and an optical path adjustment lens group 3. The laser emitted by the laser 2 converges at a point after passing through the optical path adjustment lens group 3. A detection mirror 5 and a thermal imaging component 4 are also installed on the laser head body 1. The thermal imaging component 4 includes a thermal imaging acquisition piece 401 and a data processing module 402 electrically connected to the thermal imaging acquisition piece 401. The detection mirror 5 is located between the laser 2 and the optical path adjustment lens group 3. The thermal imaging acquisition piece 401 collects the heat of the detection mirror 5 and transmits it to the data processing module 402. In this embodiment, the optical path adjustment lens group 3 includes two relatively arranged lenses. The lens closer to the laser 2 is the first lens, and the other is the second lens. The first lens converts the light beam into parallel light, and the second lens converges the parallel light at a point, which is the focal point of the second lens.

[0024] Specifically, both the laser 2 and the thermal imaging acquisition piece 401 are installed at the top of the laser head. The angle between the thermal imaging acquisition piece 401 and the incident surface of the detection mirror 5 is an acute angle. After the thermal imaging acquisition piece 401 can be located above the detection mirror 5 and form a certain angle with the incident surface of the detection mirror 5, the thermal imaging acquisition piece 401 can directly collect the thermal imaging size data on the detection mirror 5 without the need for other components to convert, which can prevent the laser head from having too large a volume change due to the need for thermal imaging data acquisition and ensure that the normal operation of the laser head is not affected.

[0025] In this embodiment, the thermal imaging acquisition piece 401 is an infrared thermal imaging sensor. The distance between the acquisition end of the thermal imaging acquisition piece 401 and the detection mirror 5 is the focal length of the thermal imaging acquisition piece 401, and the size data collected by the thermal imaging acquisition piece 401 is more accurate.

[0026] Specifically, the data processing module 402 includes a data acquisition unit, a storage unit, a processor unit, and an alarm unit. The processor unit is electrically connected to the data acquisition unit, the storage unit, and the alarm unit respectively. The storage unit stores standard data. After the data acquisition unit collects the data of the thermal imaging acquisition piece 401, the processor compares the standard data stored in the storage unit with the collected data and outputs the electrical signal of the comparison result to the alarm unit. The standard data stored in the storage unit is the threshold set for the thermal imaging size. This standard data has different values for different lasers 2. According to the corresponding laser 2 model, the corresponding set threshold is selected when making the comparison. The processor judges the comparison result as greater than the set threshold or not greater than the set threshold, and then outputs a high-level or low-level signal to the alarm unit respectively to trigger the alarm unit. The alarm unit can be connected to an alarm or a laser processing machine tool to give an operator a reminder.

[0027] Working principle or process of this embodiment: During the operation of the laser processing equipment, the laser beam emitted by the laser 2 passes through the optical path adjustment mirror group 3 and causes an obvious temperature difference on the mirror surface closest to the laser 2. Specifically, the temperature within the divergence angle range of the beam is higher. The thermal imaging acquisition component 401 continuously acquires the thermal imaging size data formed on the mirror surface due to the temperature difference and outputs it to the data processing module 402. The data processing module 402 compares the thermal imaging size data with the set threshold. If it is greater than the set threshold, it can quickly determine that the beam quality of the laser 2 has deteriorated and the laser divergence angle has increased. As Figure 2 shown, A is the diameter size of the thermal imaging of the laser beam in the normal working state without faults, and B is the diameter size of the thermal imaging of the laser beam after the beam quality has deteriorated and a fault has occurred.

[0028] Beneficial effects of this embodiment: During the operation of the laser head, the thermal imaging component 4 installed on the laser head performs thermal imaging on the mirror surface temperature difference caused by the laser beam. By comparing the thermal imaging data size with the set size threshold, it is determined whether the divergence angle of the laser beam has increased, so as to quickly determine whether the poor optical processing quality is due to the laser 2 or the optical path adjustment mirror group 3 of the laser head, improving the problem-solving efficiency and reducing the maintenance cost.

[0029] Embodiment 2

[0030] An embodiment of a method for judging the fault point of a laser head, a thermal imaging device is set on the laser head and a detection mirror 5 is set at the output end of the laser 2; the thermal imaging size data of the incident mirror surface of the detection mirror 5 is acquired through the thermal imaging device; the acquired thermal imaging size data is compared with the set threshold. If it is greater than the set threshold, it indicates that the laser 2 has a fault.

[0031] Working principle or process of this embodiment: By comparing the thermal imaging size data of the detection mirror 5 with the set size threshold, it can be known whether the divergence angle of the beam emitted by the laser 2 has increased, thereby judging whether the beam quality of the laser 2 has deteriorated. If the divergence angle of the beam emitted by the laser 2 increases, it can be confirmed that the poor optical processing quality is due to the fault of the laser 2. Otherwise, it is a fault of the internal optical path adjustment mirror group 3 of the laser head.

[0032] Beneficial effects of this embodiment: In the method of this embodiment, during the operation of the laser head, the thermal imaging size data of the detection mirror 5 is acquired through the thermal imaging device to judge whether the divergence angle of the laser beam has increased, so as to quickly determine whether the poor optical processing quality is due to the laser 2 or the optical path adjustment mirror group 3 of the laser head, improving the problem-solving efficiency and reducing the maintenance cost.

[0033] Embodiment 3

[0034] AsFigure 3 The figure shows an embodiment of a laser head fault point judgment system for implementing the above-mentioned laser head fault point judgment method; it includes a laser head 6 and a controller 7; the laser head 6 includes a thermal imaging device 8 and a laser 9, a detection mirror 10, and an optical path adjustment mirror 11 arranged in sequence; the input end of the controller 7 is electrically connected to the output end of the thermal imaging device 8, and the controller 7 includes a collection unit, a judgment unit, and an output unit. The collection unit collects the thermal imaging size data and compares it with a set threshold through the judgment unit, and the output unit outputs the electrical signal of the comparison result as an alarm signal.

[0035] Preferably, it further includes an alarm 12, the input end of the alarm 12 is electrically connected to the output end of the controller 7, and the output unit outputs the electrical signal of the comparison result to the alarm 12.

[0036] The working principle or process of this embodiment: The judgment unit of the controller 7 presets a set thermal imaging size threshold. During the operation of the laser head 6, the laser beam of the laser head 6 passes through the detection mirror 10 and the optical path adjustment mirror 11 in sequence and converges at a point for output. Since when the light beam passes through the detection mirror 10, a temperature difference will be formed on the incident surface of the detection mirror 10, and the area with a higher temperature is the range covered by the divergence angle of the laser 9. The thermal imaging device 8 collects the thermal imaging size data on the detection mirror 10 and inputs it into the collection unit. The judgment unit compares the two data. If the collected size data is greater than the set threshold, a high-level signal is sent to the output unit to trigger the alarm 12. In this embodiment, the optical path adjustment mirror 11 includes two relatively arranged lenses. The lens close to the laser 9 is the first lens, and the other is the second lens. The first lens converts the light beam into parallel light, and the second lens converges the parallel light at a point, and this point is the focal point of the second lens.

[0037] The beneficial effects of this embodiment: During the operation of the laser head 6 in the system of this embodiment, the thermal imaging device 8 is used to collect the thermal imaging size data of the detection mirror 10 to judge whether the divergence angle of the laser beam increases, so as to quickly judge whether the problem of poor light processing quality is caused by the laser 9 or the optical path adjustment mirror 11 of the laser head, improving the efficiency of problem-solving and reducing the maintenance cost.

[0038] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A laser head, comprising a laser head body (1), the laser head body (1) including a laser (2) and an optical path adjustment mirror group (3), the laser emitted by the laser (2) converging at a point after passing through the optical path adjustment mirror group (3), and a thermal imaging component (4) being further installed on the laser head body (1); the thermal imaging component (4) includes a thermal imaging acquisition piece (401) and a data processing module (402) electrically connected to the thermal imaging acquisition piece (401), the thermal imaging acquisition piece (401) acquiring the thermal imaging size data of the incident surface of the optical path adjustment mirror group (3) and transmitting it to the data processing module (402); the data processing module (402) compares the thermal imaging size data with a set threshold, and if it is greater than the set threshold, it can quickly determine that the beam quality of the laser deteriorates and the laser divergence angle becomes larger.

2. The laser head according to claim 1, wherein, The laser head body (1) further includes a detection mirror (5), the detection mirror (5) being located between the laser (2) and the optical path adjustment mirror group (3), and the thermal imaging acquisition piece (401) acquiring the heat of the detection mirror (5) and transmitting it to the data processing module (402).

3. The laser head according to claim 2, characterized in that, Both the laser (2) and the thermal imaging acquisition piece (401) are installed at the top of the laser head body (1); the included angle between the thermal imaging acquisition piece (401) and the incident surface of the detection mirror (5) is an acute angle.

4. The laser head according to claim 3, characterized in that, The thermal imaging acquisition piece (401) is an infrared thermal imaging collector.

5. The laser head according to claim 2, characterized in that, The distance between the acquisition end of the thermal imaging acquisition piece (401) and the detection mirror (5) is the focal length of the thermal imaging acquisition piece (401).

6. The laser head according to claim 2, characterized in that, The data processing module (402) includes a data acquisition unit, a storage unit, a processor unit, and an alarm unit; the processor unit is electrically connected to the data acquisition unit, the storage unit, and the alarm unit respectively; the storage unit stores standard data, and after the data acquisition unit collects the data of the thermal imaging acquisition piece (401), the processor compares the standard data stored in the storage unit with the acquired data and outputs the electrical signal of the comparison result to the alarm unit.

7. The laser head according to claim 2, characterized in that, The detection mirror (5) is a plane mirror.

8. A method for judging the fault point of a laser head, characterized in that, A thermal imaging device is provided in the laser head and a detection mirror is provided at the output end of the laser; during the operation of the laser head, the thermal imaging size data of the incident mirror surface of the detection mirror is acquired by the thermal imaging device; the acquired thermal imaging size data is compared with a set threshold, and if it is greater than the set threshold, it indicates that the laser has a fault.

9. A laser head fault point judgment system, characterized in that, For implementing the laser head fault point judgment method described in claim 8; including a laser head and a controller; the laser head includes a thermal imaging device and a laser, a detection mirror, and an optical path adjustment mirror arranged in sequence; the input end of the controller is electrically connected to the output end of the thermal imaging device, the controller includes an acquisition unit, a judgment unit, and an output unit, the acquisition unit acquires the thermal imaging size data and compares it with a set threshold through the judgment unit, and the output unit outputs the electrical signal of the comparison result as an alarm signal.

10. The laser head fault point judgment system according to claim 9, characterized in that, It further includes an alarm, the input end of the alarm is electrically connected to the output end of the controller, and the output unit outputs the electrical signal of the comparison result to the alarm.

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