Laser processing head

Abstract

The utility model belongs to the technical field of laser processing, and discloses a laser processing head which comprises a light source, a reflecting mirror, a shell and a conical lens, a light path channel is formed in the shell, the light source, the reflecting mirror and the conical lens are all arranged in the light path channel, the reflecting mirror can reflect a laser beam emitted by the light source to the conical lens, and the conical lens is arranged on the shell. The laser beam is shaped into the annular light beam through the conical lens, so that the laser beam can form the annular light spot, the width of the annular light spot is large, the welding area can be covered in the width direction, and then the requirement for the wide welding seam is met without making the reflector swing back and forth. Namely, a motor used for driving the reflecting mirror to swing back and forth does not need to be arranged, so that the overburning phenomenon at the edge position of the welding seam can be avoided, the service life of the laser processing head is remarkably prolonged, in addition, due to the fact that the reflecting mirror does not need to swing, a collimating mirror can be omitted, and the production cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of laser processing, in particular to a laser processing head. Background Art

[0002] In thin plate laser welding, the laser processing head used for welding generally includes a light source, a reflector and a focusing lens, wherein the light source can emit a laser beam to the reflector, the reflector can reflect the laser beam to the focusing lens, and the focusing lens focuses the laser beam to form a point-shaped light spot, thereby welding the thin plate. For wide weld scenarios, the existing technology usually drives the reflector to swing around the axis by a motor, so that the laser beam reflected by the reflector swings, and the light spot formed by the laser beam moves in a straight line direction, thereby meeting the requirements of wide welds.

[0003] However, in the process of the motor driving the reflector to swing back and forth, since the driving process needs to accelerate first and then decelerate, for the light spot moving back and forth in a straight line, the speed of the light spot will slow down when it moves close to the extreme position, which may cause overburning at the edge of the weld. Moreover, the motor will heat up during the driving process, thereby affecting the service life of the laser processing head. In addition, the laser processing head also needs to set an additional collimator lens between the light source and the reflector. The collimator lens is used to collimate the laser beam to ensure that the laser beam emitted by the light source can be irradiated on the reflector swinging to various positions, resulting in higher production costs. Utility Model Content

[0004] The purpose of the utility model is to provide a laser processing head to solve the problem that the swing of the reflector driven by a motor to meet the requirements of a wide weld seam may lead to overburning at the edge of the weld seam, affect the service life of the laser processing head, and have high production costs.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] Laser processing head, including:

[0007] A housing having an optical path formed therein;

[0008] a light source disposed in the optical path and configured to emit a laser beam; and

[0009] A reflector and a conical lens are both arranged in the optical path channel. The reflector is configured to reflect the laser beam emitted by the light source toward the conical lens, and the conical lens is configured to shape the laser beam into a ring-shaped beam.

[0010] Preferably, the conical lens is provided with a conical surface, the conical surface of the conical lens is a convex surface, and the conical surface of the conical lens is provided on a side of the conical lens facing the reflector.

[0011] Preferably, the laser processing head further comprises a first protective mirror, which is arranged in the optical path and located on a side of the conical lens away from the reflector.

[0012] Preferably, the laser processing head includes two or more first protective mirrors, and the two or more first protective mirrors are arranged at intervals along the optical path.

[0013] Preferably, the laser processing head further includes a second protective mirror, which is arranged in the optical path and located between the light source and the reflector.

[0014] Preferably, the conical lens is installed on the housing in a pluggable manner.

[0015] Preferably, a first cooling channel is provided in the shell, and the first cooling channel is arranged on the outer periphery of the optical path channel. A liquid inlet head and a liquid outlet head are installed on the shell, and the liquid inlet head and the liquid outlet head are respectively connected to the upstream end and downstream end of the first cooling channel, and the liquid inlet head is configured to supply cooling liquid into the first cooling channel.

[0016] Preferably, a second cooling channel is provided inside the reflector, an upstream end of the second cooling channel is communicated with the liquid inlet head, and a downstream end of the second cooling channel is communicated with the liquid outlet head.

[0017] Preferably, a mounting plate is provided on the housing, and the mounting plate is detachably connected to a functional module, and the functional module is configured to supply processing materials when the laser processing head performs processing operations.

[0018] Beneficial effects of the utility model:

[0019] The present invention shapes the laser beam through a conical lens, thereby forming an annular spot with a relatively wide width, thereby covering the width of the weld area. This eliminates the need for a reflector to swing back and forth to meet the requirements for wide welds. In other words, the present invention can meet the requirements for wide welds without the need for a motor to drive the reflector to swing back and forth, thereby avoiding overburning at the edges of the weld and significantly increasing the service life of the laser processing head. Furthermore, since the reflector does not need to swing, the present invention can also eliminate the need for a collimator lens, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1This is a schematic structural diagram of the laser processing head in the first embodiment of the present invention;

[0021] Figure 2 It is a top view of the laser processing head excluding the wire feeding gun in the first embodiment of the present invention;

[0022] Figure 3 It is along Figure 2 Cross-sectional view along line AA;

[0023] Figure 4 It is along Figure 2 Cross-sectional view along the midline BB;

[0024] Figure 5 It is along Figure 2 Cross-sectional view along the mid-CC line;

[0025] Figure 6 It is along Figure 2 Cross-sectional view along the mid-DD line;

[0026] Figure 7 It is along Figure 2 Cross-sectional view along line EE;

[0027] Figure 8 It is along Figure 2 Cross-sectional view along the midline FF;

[0028] Figure 9 It is along Figure 2 Cross-sectional view along the mid-GG line;

[0029] Figure 10 This is a schematic structural diagram of the laser processing head in the second embodiment of the present utility model;

[0030] Figure 11 This is a schematic structural diagram of the laser processing head in the third embodiment of the present invention;

[0031] Figure 12 This is a schematic structural diagram of the laser processing head in the fourth embodiment of the present utility model;

[0032] Figure 13 This is a light path diagram of the laser beam emitted by the light source in Example 1 of the present utility model.

[0033] In the picture:

[0034] 1. Shell; 11. Optical path; 121. First flow channel; 122. Second flow channel; 123. Third flow channel; 124. Fourth flow channel; 131. Liquid inlet head; 132. Liquid outlet head; 141. Fifth flow channel; 142. Sixth flow channel; 15. Mounting plate; 161. First joint; 162. Second joint; 171. Wire feed gun; 172. Powder feed gun; 1721. First gun body; 17211. Powder inlet; 17212. First powder feed joint; 1722. Second gun body; 17221. Powder outlet; 17222. Second powder feed joint; 2. Light source; 3. Reflector; 4. Conical lens; 5. First protective mirror; 6. Second protective mirror. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0036] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0039] Example 1

[0040] See also Figures 1 to 9 , and combined with Figure 13 This embodiment provides a laser processing head. Similar to the prior art, the laser processing head also includes a light source 2 and a reflector 3, wherein the light source 2 is configured to emit a laser beam, and the reflector 3 is configured to reflect the laser beam emitted by the light source 2. It can be understood that the laser processing head also includes a shell 1, and an optical path channel 11 is formed inside the shell 1. The light source 2 and the reflector 3 are both arranged in the optical path channel 11.

[0041] In addition, the laser processing head also includes a conical lens 4, which is also arranged in the optical path channel 11. The reflector 3 can reflect the laser beam emitted by the light source 2 toward the conical lens 4, and the conical lens 4 is configured to shape the laser beam into an annular beam, so that the laser beam can form an annular light spot.

[0042] Based on the above, this embodiment shapes the laser beam through the conical lens 4, so that the laser beam can form an annular spot. The annular spot is relatively wide, so that it can cover the welding area in the width direction, thereby eliminating the need to swing the reflector 3 back and forth to meet the requirements of a wide weld seam. In other words, this embodiment can meet the requirements of a wide weld seam without providing a motor for driving the reflector 3 to swing back and forth, thereby avoiding overburning at the edge of the weld seam and significantly improving the service life of the laser processing head. In addition, because the reflector 3 does not need to swing, this embodiment can also eliminate the need for a collimator lens, thereby reducing production costs.

[0043] In this embodiment, the conical lens 4 is provided with a conical surface, and the conical surface of the conical lens 4 is a convex surface. The conical surface of the conical lens 4 is arranged on the side of the conical lens 4 facing the reflector 3, so that the laser beam reflected by the reflector 3 can be shaped into an annular beam, and the laser beam can be focused to form an annular light spot of a preset size.

[0044] It is worth noting that the number of the conical lenses 4 can be one or more than two, and this embodiment does not impose any specific limitation thereto. When there are two or more conical lenses 4, the two or more conical lenses 4 are spaced apart along the optical path 11, thereby enabling the annular light beam to be gradually focused as required, thereby ensuring that the size of the formed annular light spot meets the requirements.

[0045] In addition, the laser processing head also includes a first protective mirror 5, which is arranged in the optical path channel 11 and is located on the side of the conical lens 4 away from the reflector 3, so as to prevent impurities generated during the welding process from splashing to the conical lens 4 through the optical path channel 11, thereby ensuring that the laser processing head can continue to work effectively.

[0046] Furthermore, the laser processing head includes two first protective mirrors 5 , which are arranged at intervals along the optical path 11 , thereby more effectively preventing impurities generated during the welding process from splashing onto the conical lens 4 through the optical path 11 .

[0047] It is worth noting that, in other optional embodiments, the laser processing head may also be configured to include three or more first protective mirrors 5, all of which are arranged at intervals along the optical path 11, and this embodiment does not impose any specific restrictions on this.

[0048] In addition to the first protective mirror 5, the laser processing head also includes a second protective mirror 6. The second protective mirror 6 is arranged in the optical path channel 11 and is located between the light source 2 and the reflector 3. The second protective mirror 6 can prevent external dust and other impurities from flowing from the side close to the light source 2 to the reflector 3 and the conical lens 4, thereby further preventing the reflector 3 and the conical lens 4 from being contaminated, and further ensuring that the laser processing head can continue to work effectively.

[0049] In addition, in this embodiment, the conical lens 4 is installed on the housing 1 in a pluggable manner, thereby facilitating replacement of the conical lens 4 .

[0050] It is understandable that since the lens plugging and unplugging structure is a prior art, this embodiment will not elaborate on it.

[0051] It should also be noted that, in this embodiment, the first protective mirror 5 and the second protective mirror 6 can also be installed on the housing 1 in a pluggable manner, thereby facilitating replacement of the first protective mirror 5 and the second protective mirror 6 .

[0052] Furthermore, during the operation of the laser processing head, the conical lens 4 will generate heat due to the irradiation of the laser beam. In order to improve the service life of the conical lens 4, in this embodiment, a first cooling channel is provided in the shell 1, and the first cooling channel is arranged on the outer periphery of the optical path channel 11. A liquid inlet head 131 and a liquid outlet head 132 are installed on the shell 1. The liquid inlet head 131 and the liquid outlet head 132 are respectively connected to the upstream end and the downstream end of the first cooling channel. The liquid inlet head 131 is configured to supply coolant to the first cooling channel, so as to cool the conical lens 4, thereby further ensuring that the laser processing head can work continuously and effectively.

[0053] In addition, during the operation of the laser processing head, the reflector 3 will also generate heat due to the irradiation of the laser beam. Therefore, in this embodiment, a second cooling channel is provided inside the reflector 3, and the upstream end of the second cooling channel is connected to the liquid inlet head 131, and the downstream end of the second cooling channel is connected to the liquid outlet head 132, so that the liquid inlet head 131 can also supply cooling liquid to the inside of the reflector 3, thereby cooling the reflector 3. Therefore, this embodiment can increase the service life of the reflector 3, and further ensure that the laser processing head can work continuously and effectively.

[0054] Specifically, in this embodiment, the first cooling channel includes a first flow channel 121, a second flow channel 122, a third flow channel 123 and a fourth flow channel 124, the first flow channel 121 and the second flow channel 122 are arranged on the same side, and the third flow channel 123 and the fourth flow channel 124 are arranged on the same side, wherein the liquid inlet head 131 is connected to the upstream end of the first flow channel 121, the upstream end of the second flow channel 122 and the upstream end of the second cooling channel are both connected to the downstream end of the first flow channel 121, and the downstream end of the second cooling channel is connected to the upstream end of the third flow channel 123. Specifically, the second cooling channel includes a fifth flow channel 141 and a sixth flow channel 142. Channel 142, the upstream end of the fifth flow channel 141 is connected to the downstream end of the first flow channel 121, the downstream end of the fifth flow channel 141 is connected to the upstream end of the sixth flow channel 142, the downstream end of the sixth flow channel 142 is connected to the upstream end of the third flow channel 123, and the downstream end of the third flow channel 123 is connected to the liquid outlet head 132. In addition, the downstream end of the second flow channel 122 is provided with a first joint 161, and the upstream end of the fourth flow channel 124 is provided with a second joint 162. The first joint 161 and the second joint 162 are connected through an external water pipe, and the downstream end of the fourth flow channel 124 is connected to the upstream end of the third flow channel 123. As described above, the coolant injected into the first flow channel 121 through the liquid inlet head 131 can, on the one hand, flow through the first flow channel 121, the second flow channel 122, the fourth flow channel 124 and the third flow channel 123 in sequence, and on the other hand, can also flow through the first flow channel 121, the second cooling channel and the third flow channel 123 in sequence, thereby cooling the conical lens 4 and the reflector 3.

[0055] It is worth noting that a mounting plate 15 is provided on the shell 1, and the mounting plate 15 is detachably connected to the functional module. The functional module is configured to supply processing materials when the laser processing head performs processing operations. Based on the content mentioned above, in this embodiment, the laser processing head is used to perform laser welding operations. Therefore, the functional module installed on the mounting plate 15 is a wire feeding gun 171, and the wire feeding gun 171 is used to supply welding wire to the welding point during the laser welding process.

[0056] It is understandable that since the functional module is detachably mounted on the mounting plate 15, the staff can choose to install different functional modules on the mounting plate 15 according to the actual operation, so that the laser processing head can be suitable for different laser processing operations.

[0057] It is worth noting that in this embodiment, the functional module is detachably connected to the mounting plate 15 by bolt connection. Of course, in other optional embodiments, the functional module can also be detachably connected to the mounting plate 15 by other means such as pin connection or plug-in connection, and this embodiment does not impose specific restrictions on this.

[0058] Example 2

[0059] like Figure 10 As shown, compared with the first embodiment, the difference of this embodiment is that the laser processing head is used for cladding operation. Therefore, the functional module installed on the mounting plate 15 is a powder feeding gun 172. The powder feeding gun 172 is used to feed powder during the cladding process. Specifically, in this embodiment, the powder feeding gun 172 includes a first gun body 1721 and a second gun body 1722. The first gun body 1721 is connected to the mounting plate 15, and the second gun body 1722 is sleeved on the outer periphery of the shell 1. The first gun body 1721 is provided with a powder inlet 17211, and the second gun body 1722 is provided with a plurality of powder outlets 17221, and a plurality of The powder outlets 17221 are evenly arranged along the circumference of the shell 1. In addition, the first gun body 1721 is provided with a plurality of first powder feeding joints 17212, and the plurality of first powder feeding joints 17212 are all connected to the powder inlet 17211. The second gun body 1722 is provided with a plurality of second powder feeding joints 17222, and the plurality of second powder feeding joints 17222 are connected one-to-one with the plurality of powder outlets 17221. The plurality of first powder feeding joints 17212 and the plurality of second powder feeding joints 17222 are connected one-to-one through a powder feeding pipe (not shown in the figure), so that powder can be fed during the cladding process.

[0060] Example 3

[0061] like Figure 11 As shown, compared with the first embodiment, the difference of this embodiment is that the laser processing head is used for cladding operation, and different from the second embodiment, the powder feeding gun 172 in this embodiment is directly sleeved on the outer periphery of the shell 1.

[0062] Example 4

[0063] like Figure 12 As shown, compared with the first embodiment, the difference of this embodiment is that the laser processing head is used for laser cutting operation, so no functional module is installed on the mounting plate 15.

[0064] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Laser processing head, characterized in that, include: A housing (1) is provided with an optical path (11) formed therein; a light source (2) disposed in the optical path (11) and configured to emit a laser beam; and A reflector (3) and a conical lens (4) are both arranged in the optical path channel (11); the reflector (3) is configured to reflect the laser beam emitted by the light source (2) toward the conical lens (4); and the conical lens (4) is configured to shape the laser beam into a ring-shaped beam.

2. The laser processing head according to claim 1, characterized in that The conical lens (4) is provided with a conical surface, the conical surface of the conical lens (4) is a convex surface, and the conical surface of the conical lens (4) is provided on the side of the conical lens (4) facing the reflector (3).

3. The laser processing head according to claim 1, characterized in that The laser processing head further comprises a first protective mirror (5), which is arranged in the optical path channel (11) and is located on a side of the conical lens (4) away from the reflector (3).

4. The laser processing head according to claim 3, characterized in that The laser processing head comprises more than two first protective mirrors (5), and the more than two first protective mirrors (5) are arranged at intervals along the optical path channel (11).

5. The laser processing head according to claim 3, characterized in that The laser processing head further comprises a second protective mirror (6), which is arranged in the optical path channel (11) and located between the light source (2) and the reflector (3).

6. The laser processing head according to claim 1, characterized in that The conical lens (4) is installed on the housing (1) in a pluggable manner.

7. The laser processing head according to claim 1, characterized in that A first cooling channel is provided in the shell (1), and the first cooling channel is arranged on the outer periphery of the optical path channel (11). A liquid inlet head (131) and a liquid outlet head (132) are installed on the shell (1), and the liquid inlet head (131) and the liquid outlet head (132) are respectively connected to the upstream end and the downstream end of the first cooling channel. The liquid inlet head (131) is configured to supply cooling liquid into the first cooling channel.

8. The laser processing head according to claim 7, characterized in that A second cooling channel is provided inside the reflector (3), the upstream end of the second cooling channel is in communication with the liquid inlet head (131), and the downstream end of the second cooling channel is in communication with the liquid outlet head (132).

9. The laser processing head according to claim 1, characterized in that The housing (1) is provided with a mounting plate (15), the mounting plate (15) being detachably connected to a functional module, and the functional module being configured to supply processing materials when the laser processing head performs processing operations.

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