Large-breadth laser cleaning system

Abstract

The invention discloses a large-breadth laser cleaning system and relates to the technical field of laser cleaning, the large-breadth laser cleaning system comprises a rotating mirror device and a laser output device, the rotating mirror device comprises a rotating mirror, a driving motor and a field lens, the rotating mirror is connected with the output end of the driving motor, and the driving motor can drive the rotating mirror to rotate with the center axis of the rotating mirror as a rotating shaft; the field lens is arranged between the rotating mirror and the surface of the workpiece; the laser output device can output laser to the rotating mirror, and the prism surface of the rotating mirror can reflect the laser to the field lens, so that the field lens outputs a focused light beam to the surface of the workpiece for laser cleaning, and the laser cleaning efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of laser cleaning, in particular to a large-format laser cleaning system. Background Art

[0002] Laser cleaning is a new type of material surface cleaning process. Laser pulses are emitted by a laser to act on the material surface, and the contaminants on the material surface are cleaned using the resulting thermal and mechanical effects.

[0003] At present, laser cleaning technology has been widely used in various industrial production and subsequent maintenance. Traditional laser cleaning devices usually use galvanometer scanning to clean, using galvanometer scanning to cover the entire marking area with a point-shaped laser, and the efficiency is usually no more than 50m 2 / h, while actual industrial applications often require 100m 2 / h, or even higher cleaning efficiency. The main reason for the low cleaning efficiency of traditional laser cleaning devices is that the area that the galvanometer can scan per unit time is limited by the upper speed limit of the galvanometer motor. In order to improve the cleaning efficiency, a common approach is to arrange multiple laser cleaning heads in a row to make up for the lack of efficiency with quantity.

[0004] However, this method has high requirements for control level and production rhythm. At the same time, the use of a large number of laser cleaning heads also increases the probability of problems. In actual operation, due to the movement of the workpiece and the operation of the staff, a certain laser cleaning head often has problems, thus affecting the result of the entire laser cleaning. It can be seen that how to provide a laser cleaning device that can meet the cleaning needs is a problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to provide a large-format laser cleaning system to solve the problems existing in the above-mentioned related technologies and to improve the laser cleaning efficiency.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a large-format laser cleaning system, comprising a rotating mirror device and a laser output device, wherein the rotating mirror device comprises a rotating mirror, a driving motor and a field mirror, wherein the rotating mirror is connected to the output end of the driving motor, the driving motor can drive the rotating mirror to rotate with its central axis as the rotating axis, and the field mirror is arranged between the rotating mirror and the surface of a workpiece; the laser output device can output laser to the rotating mirror, and the prism surface of the rotating mirror can reflect the laser to the field mirror, so that the field mirror outputs a focused light beam to the surface of the workpiece for laser cleaning.

[0008] Preferably, the laser output device includes a laser, a collimator and a laser reflector, the output end of the laser is connected to the collimator so that the collimator can output a collimated light beam, and the laser reflector can reflect the collimated light beam to the prism surface of the rotating mirror.

[0009] Preferably, the laser is a 10,000-watt continuous fiber laser.

[0010] Preferably, the rotating mirror is an octahedral prism.

[0011] Preferably, a gold-plated layer is provided on the surface of the rotating mirror.

[0012] Preferably, the large-format laser cleaning system also includes a light control device, which includes a rotating mirror positioning mechanism and a controller, wherein the rotating mirror positioning mechanism is used to determine the rotation angle of the rotating mirror, and the rotating mirror positioning mechanism and the laser output device are both connected to the controller; when the prism surface of the rotating mirror is located at a position where it can contact the laser output by the laser output device, the controller turns on the laser output device; when the edge of the rotating mirror is located at a position where it can contact the laser output by the laser output device, the controller turns off the laser output device.

[0013] Preferably, the rotating mirror positioning mechanism includes a red light generator, a red light reflector and a red light sensor, the red light generator can output red light to the rotating mirror, and the rotating mirror can reflect the red light to the red light reflector, the red light reflector can reflect the red light to the red light sensor, the red light sensor is connected to the controller, and the controller can turn on or off the laser output device according to the signal of the red light sensor.

[0014] Preferably, the large-format laser cleaning system further comprises a cooling device, and the cooling device is capable of cooling the rotating mirror device.

[0015] Preferably, the cooling device includes a first water-cooling pipe and a water cooler, the first water-cooling pipe is arranged in the rotating mirror device and connected to the water cooler, and the water cooler can form a cooling water circulation in the first water-cooling pipe to cool the rotating mirror device.

[0016] Preferably, the cooling device further comprises a second water cooling pipe, which is arranged in the laser output device and connected to the water cooler, and the water cooler can form a cooling water circulation in the second water cooling pipe to cool the laser output device.

[0017] Compared with the related art, the present invention has achieved the following technical effects:

[0018] The large-format laser cleaning system provided by the present invention comprises a rotating mirror device and a laser output device. The rotating mirror device comprises a rotating mirror, a driving motor and a field mirror. When in use, the driving motor drives the rotating mirror to rotate with its central axis as the rotating axis, and the laser output device outputs laser to the rotating mirror, so that the laser is reflected to the field mirror through the prism surface of the rotating mirror, and the field mirror outputs a focused light beam to the surface of the workpiece for laser cleaning. The present invention relies on a high-speed rotating mirror and a large-size field mirror, and can achieve a scanning range of more than 500 mm, thereby producing a larger laser format, improving the utilization rate of the laser, and thus improving the laser cleaning efficiency, and is particularly suitable for laser cleaning of large workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a large-format laser cleaning system provided by an embodiment of the present invention (the cooling device is not shown);

[0021] Figure 2 A schematic diagram of a rotating mirror and a driving motor provided in an embodiment of the present invention;

[0022] Figure 3 A front view of a rotating mirror and a driving motor provided by an embodiment of the present invention;

[0023] Figure 4 A top view of a rotating mirror and a driving motor provided in an embodiment of the present invention;

[0024] Figure 5 A left side view of a rotating mirror and a driving motor provided by an embodiment of the present invention;

[0025] Figure 6 A schematic diagram of a control method for a light control device provided by an embodiment of the present invention.

[0026] In the figure: 1-rotating mirror, 2-driving motor, 3-field mirror, 4-laser, 5-collimator, 6-laser reflector, 7-controller, 8-red light generator, 9-red light reflector, 10-red light sensor. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide a large-format laser cleaning system to solve the problems existing in the related technology and to improve the laser cleaning efficiency.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 As shown, this embodiment provides a large-format laser cleaning system, including a rotating mirror device and a laser output device, wherein the rotating mirror device includes a rotating mirror 1, a driving motor 2, and a field lens 3. Figure 2-Figure 5 As shown, the rotating mirror 1 is connected to the output end of the driving motor 2, the driving motor 2 can drive the rotating mirror 1 to rotate with its central axis as the axis, and the field lens 3 is arranged between the rotating mirror 1 and the surface of the workpiece; the laser output device can output laser to the rotating mirror 1, and the prism surface of the rotating mirror 1 can reflect the laser to the field lens 3, so that the field lens 3 outputs a focused light beam to the surface of the workpiece for laser cleaning.

[0031] It should be noted that the rotating mirror 1 in the present embodiment is preferably an octahedral prism, the cross-section of the octahedral prism is a regular octahedron, and the surface of the octahedral prism is provided with a gold-plated layer to improve the reflectivity, increase the maximum laser power that the rotating mirror 1 can withstand, and ensure that the system can complete high-power and large-format laser cleaning work; when in use, the rotating mirror 1 is driven to rotate by the driving motor 2, and when the laser output by the laser output device irradiates the prism surface of the rotating mirror 1, the laser is reflected to the field lens 3, and is focused by the field lens 3 to form a focused light beam to reach the surface of the workpiece; since the rotation process of the rotating mirror 1 is continuous, continuous laser light can enter the field lens 3 to ensure the stable output of the focused light beam; for the rotation speed of the rotating mirror 1, technical personnel in this field can adjust it according to actual needs. Since the scanning speed of the laser can be increased with the increase of the rotation speed of the rotating mirror 1, combined with the large-size field lens 3, the laser scanning length of the system on the workpiece surface can reach 500mm-700mm, which is much larger than the limit of the current galvanometer scanning system, thereby greatly improving the laser cleaning efficiency.

[0032] In this embodiment, the laser output device includes a laser 4, a collimator 5 and a laser reflector 6. The output end of the laser 4 is connected to the collimator 5 so that the collimator 5 can output a collimated light beam, and the laser reflector 6 can reflect the collimated light beam to the prism surface of the rotating mirror 1. Specifically, the laser 4 in this embodiment is preferably a 10,000-watt continuous fiber laser. When in use, the 10,000-watt continuous fiber laser outputs laser light through the optical fiber. After the laser enters the collimator 5, a collimated light beam is formed, that is, a collimated light beam. The collimated light beam is reflected by the laser reflector 6 to the prism surface of the rotating mirror 1, and then reflected to the field mirror 3 below the rotating mirror 1.

[0033] In this embodiment, the large-format laser cleaning system also includes a light control device, which includes a rotating mirror positioning mechanism and a controller 7. The rotating mirror positioning mechanism is used to determine the rotation angle of the rotating mirror 1, and the rotating mirror positioning mechanism and the laser output device are both connected to the controller 7; when the prism surface of the rotating mirror 1 is located at a position where it can contact the laser output by the laser output device, the controller 7 turns on the laser output device; when the edge of the rotating mirror 1 is located at a position where it can contact the laser output by the laser output device, the controller 7 turns off the laser output device.

[0034] It should be noted that when the laser output by the laser output device irradiates the edge of the rotating mirror 1, the laser energy cannot enter the field lens 3 completely because the laser is diffusely reflected at this time, which will cause the position near the rotating mirror 1 inside the rotating mirror device to heat up or even be damaged. Therefore, the system is provided with a light control device, which determines the rotation angle of the rotating mirror 1 through the rotating mirror positioning mechanism, that is, obtains the posture of the rotating mirror 1 during operation, and controls the switching light of the laser output device through the controller 7. When the laser output by the laser output device is about to irradiate the edge of the rotating mirror 1, the light is turned off, and after the edge of the rotating mirror 1 turns around, the light is turned on again, so that the laser output by the laser output device avoids the edge of the rotating mirror 1, thereby avoiding heat dissipation and heat accumulation that damages the internal structure of the rotating mirror device.

[0035] Furthermore, the rotating mirror positioning mechanism in the present embodiment includes a red light generator 8, a red light reflector 9 and a red light sensor 10. The red light generator 8 can output red light to the rotating mirror 1, and the rotating mirror 1 can reflect red light to the red light reflector 9. The red light reflector 9 can reflect red light to the red light sensor 10. The red light sensor 10 is connected to the controller 7. The controller 7 can turn on or off the laser output device according to the signal of the red light sensor 10.

[0036] When in use, the red light generated by the red light generator 8 is irradiated onto the rotating mirror 1, and the red light is reflected by the rotating mirror 1 to the red light reflecting mirror 9, and then returned to the red light sensor 10. The red light sensor 10 sends a signal to the controller 7, and the controller 7 sends a signal to the laser output device to control the laser output device to emit light and turn off the light. The controller 7 can determine the current position of the rotating mirror 1 based on the signal sent by the red light sensor 10 (the state of returning red light), thereby determining when the laser will approach the edge of the rotating mirror 1 and adjusting the on / off light state of the laser output device.

[0037] It should be noted that the start and stop of the rotating mirror 1, the change of the rotation speed and the switch of the laser 4 in this embodiment are all controlled by the controller 7. When the rotation speed of the rotating mirror 1 is stable, the controller 7 controls the laser 4 to turn on and off regularly, such as Figure 6 As shown, when the rotating mirror 1 is within the range of 12.5°-32.5° and 57.5°-77.5°, the laser remains on, and the laser is turned off at other times, which can ensure that the laser 4 does not emit light when the edge of the rotating mirror 1 is aligned with the laser light outlet.

[0038] It should be noted that, for an alternative solution to the rotating mirror positioning mechanism, if the initial position of the rotating mirror 1 and the motion state of the driving motor 2 at any point in time can be read, the posture of the rotating mirror 1 during operation can be known more accurately, thereby more precisely controlling the switching of the laser 4.

[0039] In this embodiment, the large-format laser cleaning system also includes a cooling device, which includes a first water-cooling pipe, a second water-cooling pipe and a water cooler. The first water-cooling pipe is arranged in the rotating mirror device, and the second water-cooling pipe is arranged in the laser output device. The first water-cooling pipe and the second water-cooling pipe are both connected to the water cooler. The water cooler can form a cooling water circulation in the first water-cooling pipe and the second water-cooling pipe to cool the rotating mirror device and the laser output device respectively, thereby ensuring the smooth operation of the entire system.

[0040] The working process of the large-format laser cleaning system provided in this embodiment is as follows:

[0041] When the controller 7 sends a rotation switch and speed adjustment instruction to the driving motor 2, the driving motor 2 drives the rotating mirror 1 to rotate, and reaches the predetermined speed after a short period of acceleration and deceleration; the laser is output by the laser 4, and the laser outputs a collimated light beam after passing through the collimator 5. The collimated light beam is reflected by the laser reflector 6 and reaches the prism surface of the rotating mirror 1, and after reflection, it reaches the field mirror 3 and outputs a focused light beam to perform laser cleaning on the surface of the workpiece. At the same time, the red light generator 8 continuously generates low-power red light, and the red light reaches the red light reflector 9 after being reflected by the rotating mirror 1, and then enters the red light sensor 10. According to the result returned by the red light sensor 10, the controller 7 controls the switch of the laser 4 to prevent the laser output by the laser 4 from irradiating the edge of the rotating mirror 1 to cause scattering and damage the internal structure of the rotating mirror device; in this process, cooling water is provided to the rotating mirror device and the laser output device through a water cooler to promptly remove the heat generated inside and prevent device damage caused by heat accumulation.

[0042] The large-format laser cleaning system provided in this embodiment has the following advantages:

[0043] First, the rotating mirror 1 is a gold-plated octahedral prism, which has high reflectivity, is not easy to accumulate heat, and has a long service life.

[0044] Second, laser cleaning is performed by using the rotating mirror 1 in conjunction with the field lens 3 with a long focal length, so that the cleaning line width is long and the cleaning efficiency is high.

[0045] Third, the position and posture of the rotating mirror 1 are determined by the red light generator 8 and the red light sensor 10, and the laser is switched on and off in coordination with the electrical signal, so that the laser does not emit light when it is aimed at the edge of the rotating mirror 1, thereby reducing internal damage caused by scattering and extending the service life.

[0046] Fourth, the heat generated by the system operation is quickly removed through the water chiller and cooling water circulation pipeline, allowing the equipment to run smoothly and further extending its service life.

[0047] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A large-format laser cleaning system, characterized in that: The invention comprises a rotating mirror device and a laser output device, wherein the rotating mirror device comprises a rotating mirror, a driving motor and a field mirror, wherein the rotating mirror is connected to the output end of the driving motor, the driving motor can drive the rotating mirror to rotate with its central axis as the rotating axis, and the field mirror is arranged between the rotating mirror and the surface of the workpiece; the laser output device can output laser to the rotating mirror, and the prism surface of the rotating mirror can reflect the laser to the field mirror, so that the field mirror outputs a focused light beam to the surface of the workpiece for laser cleaning.

2. The large-format laser cleaning system according to claim 1, characterized in that: The laser output device comprises a laser, a collimator and a laser reflector. The output end of the laser is connected to the collimator so that the collimator can output a collimated light beam, and the laser reflector can reflect the collimated light beam to the prism surface of the rotating mirror.

3. The large-format laser cleaning system according to claim 2, characterized in that: The laser is a 10,000-watt continuous fiber laser.

4. The large-format laser cleaning system according to claim 1, characterized in that: The rotating mirror is an octahedral prism.

5. The large-format laser cleaning system according to claim 1, characterized in that: The surface of the rotating mirror is provided with a gold-plated layer.

6. The large-format laser cleaning system according to claim 1, characterized in that: The large-format laser cleaning system also includes a light control device, which includes a rotating mirror positioning mechanism and a controller. The rotating mirror positioning mechanism is used to determine the rotation angle of the rotating mirror, and the rotating mirror positioning mechanism and the laser output device are both connected to the controller; when the prism surface of the rotating mirror is located at a position where it can contact the laser output by the laser output device, the controller turns on the laser output device; when the edge of the rotating mirror is located at a position where it can contact the laser output by the laser output device, the controller turns off the laser output device.

7. The large-format laser cleaning system according to claim 6, characterized in that: The rotating mirror positioning mechanism includes a red light generator, a red light reflector and a red light sensor. The red light generator can output red light to the rotating mirror, and the rotating mirror can reflect the red light to the red light reflector. The red light reflector can reflect the red light to the red light sensor. The red light sensor is connected to the controller, and the controller can turn on or off the laser output device according to the signal of the red light sensor.

8. The large-format laser cleaning system according to claim 1, characterized in that: The large-format laser cleaning system further comprises a cooling device, which is capable of cooling the rotating mirror device.

9. The large-format laser cleaning system according to claim 8, characterized in that: The cooling device includes a first water-cooling pipe and a water cooler. The first water-cooling pipe is arranged in the rotating mirror device and connected to the water cooler. The water cooler can form a cooling water circulation in the first water-cooling pipe to cool the rotating mirror device.

10. The large-format laser cleaning system according to claim 9, characterized in that: The cooling device also includes a second water cooling pipe, which is arranged in the laser output device and connected to the water cooler. The water cooler can form a cooling water circulation in the second water cooling pipe to cool the laser output device.

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