Anti-splashing structure of laser processing head and laser processing head

Abstract

The invention belongs to the technical field of laser processing, and particularly relates to a laser processing head anti-splashing structure and a laser processing head. The anti-splashing structure of the laser machining head comprises a protective mirror, a nozzle and a stop assembly. Wherein the stop assembly is arranged between the protective mirror and the nozzle, but not limited to, and can also be arranged on the nozzle. The stop assembly comprises at least one first stop structure. In one case, the first stop structure is arranged outside the first channel. And under the other condition, the first stop structure is arranged in the first channel so as to be used for adsorbing and / or stopping substances such as splashes and chippings generated during machining. According to the technical scheme, the anti-splashing effect can be greatly improved, the protective glass is prevented from being damaged, and the service life of the protective glass is prolonged.

Description

Technical Field

[0001] This application belongs to the technical field of laser processing, and particularly relates to a splash-proof structure for a laser processing head and a laser processing head. Background Art

[0002] Laser processing uses a laser beam with a high energy density as a heat source to heat a workpiece. The energy of the laser radiation diffuses into the interior of the material through heat conduction, melting the material to form a specific molten pool for welding or cutting purposes. When the splash-proof structure of the laser processing head welds or cuts materials with relatively large splashes such as galvanized sheets, carbon steels, and irons, the generated residues and splashes directly hit the protective mirror, causing damage to the protective mirror and resulting in relatively high maintenance costs for users.

[0003] Currently, in response to the above problems, a separate protective cover is generally provided outside the laser processing head. However, this method can only collect and block some welding slag and cannot completely prevent the welding slag from entering the barrel interior. Therefore, in the prior art, the splash-proof structure of the laser processing head still has problems of welding slag clogging the gun barrel and damaging the protective mirror. Summary of the Invention

[0004] The purpose of the present invention is to provide a splash-proof structure for a laser processing head and a laser processing head, aiming to solve the problem that the protective mirror is easily damaged in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: A splash-proof structure for a laser processing head, comprising: A protective mirror; A nozzle; the protective mirror and the nozzle are located at both ends of a first channel for transmitting laser light; A stop component, provided between the protective mirror and the nozzle, the stop component includes at least one first stop structure, and the arrangement form of the first stop structure enables the laser to pass through the first channel without obstruction.

[0006] In one embodiment, part or all of the first stop structure is a permanent magnet and / or an electromagnet, and the permanent magnet and / or the electromagnet is arranged at a position close to the nozzle or the protective mirror, or arranged on the nozzle or the protective mirror.

[0007] In one embodiment, part or all of the first stop structure is arranged inside or outside the first channel; and When the first stop structure is located in the first channel, the first stop structure has a first through hole coaxially arranged with the first channel.

[0008] In one embodiment, the stop component includes a second stop structure, the second stop structure is located in the first channel, and has an annular groove forming a preset angle with the central axis of the first channel; or, the second stop structure is recessed with an annular groove on the side facing the nozzle; The second stop structure has a second through hole coaxially arranged with the first channel, and the axial cross-section of the second through hole is rectangular, conical or inverted conical.

[0009] In one embodiment, the stop assembly includes a third stop structure disposed between the first stop structure and the nozzle. The third stop structure is plate-shaped and has a third through hole coaxially arranged with the first channel, and the third through hole is adapted to the scanning pattern of the laser.

[0010] In one embodiment, the anti-spatter structure of the laser processing head further includes a gas delivery member for delivering gas in a direction at a preset angle to the axis of the protective mirror; and / or, The anti-spatter structure of the laser processing head further includes a suction member for sucking in a direction at a preset angle to the axis of the protective mirror.

[0011] In one embodiment, the stop assembly is connected and fixed to the laser processing head by at least one of a connecting member, a thread, a connecting hole, riveting, a fastener, a socket or a clamping structure.

[0012] In one embodiment, at least a part of the outer surface of the stop assembly is provided with an adsorption layer; The adsorption layer is a non-smooth surface layer with the Coanda effect; and / or The adsorption layer is a sticky anti-spatter compound coating or film.

[0013] In one embodiment, the protective mirror is provided with an anti-spatter coating layer or a fourth stop structure that can improve the damage threshold of the lens.

[0014] According to another aspect of the present application, a laser processing head is provided. The laser processing head includes the anti-spatter structure of the laser processing head in the above technical solution, and the laser processing head is one of a hand-held laser welding head, an automatic laser welding device and an automatic laser cutting device.

[0015] The present invention has at least the following beneficial effects: The anti-spatter structure of the laser processing head of the present invention includes a protective mirror, a nozzle and a stop assembly. The stop assembly is disposed between the protective mirror and the nozzle, but is not limited thereto, and may also be disposed on the nozzle. The stop assembly includes at least one first stop structure. In one case, the first stop structure is disposed outside the first channel. In another case, the first stop structure is disposed in the first channel to adsorb and / or block spatter, debris and other substances generated during processing. The technical solution of the present application improves the anti-spatter effect, avoids damage to the protective mirror, and extends the service life of the protective mirror; at the same time, it also avoids the problem that the external protective cover affects the operator's field of view. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 Schematic cross-sectional view of the anti-spatter structure of the laser processing head for the first case; Figure 2 Schematic cross-sectional view of the anti-spatter structure of the laser processing head for the second case; Figure 3 Schematic cross-sectional view of the anti-spatter structure of the laser processing head for the third case; Figure 4 Schematic cross-sectional view of the anti-spatter structure of the laser processing head for the fourth case; Figure 5 Schematic cross-sectional view of the anti-spatter structure of the laser processing head for the fifth case; Figure 6 Schematic cross-sectional view of the anti-spatter structure of the laser processing head for the sixth case; Figure 7 For Figure 2 One of the schematic views of the first stop structure and the first channel in Figure 8 For Figure 2 Another schematic view of the first stop structure and the first channel in Figure 9 For Figure 1 One of the schematic views of the first stop structure and the first channel in Figure 10 For Figure 1 Another schematic view of the first stop structure and the first channel in Figure 11 Schematic cross-sectional view of the anti-spatter structure of the laser processing head provided with a blowing member; Figure 12 Schematic cross-sectional view of the anti-spatter structure of the laser processing head provided with a suction member; Figure 13 Schematic three-dimensional view of the third stop structure; Figure 14 Schematic cross-sectional detail view at the protective mirror; Figure 15 Schematic cross-sectional view of the first case of the second stop structure; Figure 16 Schematic cross-sectional view of the second case of the second stop structure; Figure 17 Schematic cross-sectional view of the third case of the second stop structure; Figure 18 Cross-sectional schematic diagram of the fourth case of the second gear structure.

[0018] Among them, each reference numeral in the figure: 1. Protective mirror; 10. Protective mirror base; 21. First stop structure; 210. First through hole; 22. Second stop structure; 220. Second through hole; 222. Annular groove; 221. Annular inclined surface part; 23. Third stop structure; 230. Third through hole; 3. Nozzle; 40. First channel; 401. Magnetic attraction part; 50. Air delivery part; 60. Air suction part; 70. Air pressure balance part. Embodiment

[0019] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0020] In the description of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship 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, and therefore should not be construed as limiting the present invention.

[0021] In addition, the terms "first", "second", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0022] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Such as Figures 1 to 18As shown in the figure, a splash-proof structure of a laser processing head according to the present application includes a protective mirror 1, a nozzle 3, and a stop assembly 2. The stop assembly 2 is disposed between the protective mirror 1 and the nozzle 3, but is not limited thereto, and may also be disposed on the nozzle 3. Specifically, a first channel 40 for transmitting laser is provided between the protective mirror 1 and the nozzle 3. The stop assembly 2 includes at least one first stop structure 21, and part or all of the first stop structure is disposed inside or outside the first channel 40. In one case, the first stop structure 21 is disposed outside the first channel 40. In other words, at least one tubular structure with a certain use or quantity is provided between the protective mirror 1 and the nozzle 3. A first channel 40 is provided on one tubular structure, or the channels on each tubular structure are connected to form the first channel 40. The first stop structure 21 is disposed on the periphery of the above-mentioned tubular structure. In another case, the first stop structure 21 is only disposed inside the first channel 40 for adsorbing and / or blocking substances such as splashes and debris generated during processing.

[0024] In this embodiment, part or all of the first stop structure 21 is a permanent magnet or an electromagnet. The permanent magnet and / or the electromagnet can be disposed at a position close to the nozzle or the protective mirror, or directly disposed on the nozzle or the protective mirror, or can also be disposed at a part extending from the nozzle or the protective mirror.

[0025] In this embodiment, at least one of the first stop structures 21 is a permanent magnet. Among them, at least one of the first stop structures 21 is an electromagnet. Specifically, the first stop structure 21b that is a permanent magnet and the first stop structure 21a that is an electromagnet are sequentially disposed between the nozzle 3 and the protective mirror 1. Further, the first stop structure 21b of the permanent magnet disposed close to the nozzle 3 is used for primary blocking of splashing substances, and part of the unblocked splashes are blocked by the electromagnetic first stop structure 21a disposed behind it.

[0026] Specifically, the electromagnetic first stop structure 21a can automatically adjust the direction and intensity of the magnetic adsorption force of the first stop structure 21a through current to avoid dust, splashes, etc. contaminating the new protective mirror 1 and the cavity of the protective mirror 1 during the process of replacing the protective mirror 1. During the process of replacing the protective mirror 1, the permanent magnet first stop structure 21b continuously maintains the magnetic force, and the electromagnetic first stop structure 21a is powered off or the current is adjusted, so that the dust or splashes near it flow back to the vicinity of the permanent magnet first stop structure 21 until they are adsorbed and fixed.

[0027] In this embodiment, the first stop structure 21 is in a ring structure, which surrounds the inside or outside of the first channel 40. In other embodiments, such as Figure 1 , Figure 2 , Figure 7 , Figure 8 , Figure 9 , and Figure 10As shown, the first stop structure 21 is disposed outside the first channel 40. Among them, the first stop structure 21 can be a block structure, and is only disposed on one side of the first channel 40, which can be one side inside the first channel 40 or one side of the outer wall of the first channel 40. Optionally, the number of the first stop structures 21 is not limited to one, and can be a plurality of uniformly arranged around.

[0028] In this embodiment, when at least part of the first stop structure 21 is located in the first channel 40, the first stop structure 21 has a first through hole 210 coaxially arranged with the first channel 40 for the laser beam to pass through.

[0029] In this embodiment, when the first stop structure 21 is located outside the first channel 40, it can be disposed around the periphery of the protective mirror 1 and its vicinity, or can be located near the nozzle 3 and its periphery.

[0030] In this embodiment, the stop assembly 2 includes a second stop structure 22, and the second stop structure 22 is located in the first channel 40. When at least part of the first stop structure 21 is located in the first channel 40, in one case, the first stop structure 21 and the second stop structure 22 are coaxially sleeved with each other. Specifically, the spatter is blocked at the second stop structure 22 and then adsorbed and collected by the first stop structure 21.

[0031] In this embodiment, the first stop structure 21 and the second stop structure 22 are spaced apart from each other.

[0032] In this embodiment, as Figure 5 、 Figure 6 、 Figure 11 、 Figure 12 、 Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 and Figure 18 shown, the second stop structure 22 forms an annular inclined surface portion 221 with a preset angle with the central axis of the first channel 40. In other words, the second stop structure 22 is formed into an inverted conical annular structure to form a collection groove with the inner wall of the first channel 40 or the inner wall of the first stop structure 21, facilitating the collection of spatter.

[0033] In this embodiment, the second stop structure 22 is an annular groove 222 recessed toward the nozzle 3 to facilitate the collection of spatter.

[0034] Optionally, when the second stop structure 22 is set as a thin sheet structure, in one case: its sheet body extends in a direction perpendicular to the central axis of the first channel 40, and its sheet body and the inner wall of the first channel 40 form a groove structure of 90 degrees, as Figure 15 shown.

[0035] Optionally, when the second stop structure 22 is arranged as a thin sheet structure, in one case: its sheet body extends in a direction intersecting the central axis of the first channel 40, and an annular inclined surface portion 221 structure with an acute angle is formed between the sheet body and the inner wall of the first channel 40. As Figure 18 shown, and the annular inclined surface portion 221 is opened in the direction towards the nozzle 3. In other words, the second stop structure 22 forms an inverted conical annular inclined surface structure.

[0036] Optionally, when the second stop structure 22 is arranged as a thin sheet structure, in one case: its sheet body extends in a direction intersecting the central axis of the first channel 40, and an annular inclined surface portion 221 structure with an obtuse angle is formed between the sheet body and the inner wall of the first channel 40. As Figure 17 shown, and the annular inclined surface portion 221 is opened in the direction towards the protective mirror 1. In other words, the second stop structure 22 forms a conical annular inclined surface structure.

[0037] In this embodiment, please refer to Figure 14 , the laser processing head further includes a protective mirror base 10, the protective mirror base 10 is in the shape of a drawer or an annular sleeve structure, the protective mirror base 10 has magnetism, and a magnetic attraction portion 401 that attracts the protective mirror base 10 is provided at a corresponding position on the inner wall of the first channel 40. The two cooperate with each other to form an installation structure for the protective mirror 1, and the rapid installation and rapid disassembly of the protective mirror can be realized.

[0038] Optionally, both the protective mirror base 10 and the magnetic attraction portion 401 are arranged as electromagnets. After the protective mirror 1 is disassembled, the power can be automatically cut off. At this time, the protective mirror base 10 will not be affected by the external environment and will not be contaminated with dust. In other words, before the new protective mirror base 10 is installed, it does not generate magnetic attraction, which means that the risk of its being contaminated with dust is relatively low.

[0039] Furthermore, the magnetic attraction between the protective mirror base 10 and the magnetic attraction portion 401 can also adsorb dust and other splashes inside the first channel 40 close to the protective mirror 1, playing a certain dust-proof function.

[0040] In this embodiment, the second stop structure 22 has a second through hole 220 coaxially arranged with the first channel 40, and the axial cross section of the second through hole 220 is rectangular or inverted conical, or rectangular and then inverted conical in sequence; or inverted conical and then rectangular in sequence.

[0041] In this embodiment, Figure 6 , Figure 11 , Figure 12 and Figure 13 shown, the stop assembly 2 includes a third stop structure 23, the third stop structure 23 is arranged between the first stop structure 21 and the nozzle 3, and preferably, it can be arranged at a position close to the nozzle 3.

[0042] Optionally, the third stop structure 23 has a third through hole 230 coaxially arranged with the first channel 40, and the third through hole 230 is adapted to the scanning pattern of the laser. Optionally, the third through hole 230 is formed in the third stop structure 23 under the burning of the laser. Before the laser is turned on, the third stop structure 23 is a sealed film layer structure to ensure the dust-free sealing of the inner cavity of the first channel 40.

[0043] In this embodiment, the first stop structure 21 (the second stop structure 22) and the third stop structure 23 are arranged in sequence along the laser emission direction, and the diameters of the first through hole 210, the second through hole 220 and the third through hole 230 decrease in sequence. Moreover, the diameter shapes of the first channel 40, the second channel and the third channel are all adaptively set according to the laser scanning pattern; for example, they can be geometric shapes such as circles and directions, or irregular shapes.

[0044] In this embodiment, the third stop structure 23 is a thin plate or can be understood as a thin film layer, for example: materials such as copper, aluminum, and stainless steel that do not deform after being burned through by the laser. Of course, it is not limited to copper, aluminum, and stainless steel, and other materials with similar properties to copper, aluminum, and stainless steel can also be used.

[0045] In this embodiment, as Figure 11 shown, the anti-spatter structure of the laser processing head further includes a gas delivery member 50 for delivering gas. The gas delivery member 50 is used to deliver gas along a direction at a preset angle with the axis of the protective mirror 1 to blow the spatter near the nozzle 3 to a safe range. Optionally, at least one circle of air outlet holes is provided on the gas delivery member 50, and the opening direction of the air outlet holes is inclined.

[0046] In this embodiment, as Figure 12 shown, the anti-spatter structure of the laser processing head further includes a suction member 60 for sucking along a direction at a preset angle with the axis of the protective mirror 1, so as to generate a negative pressure near the nozzle 3 and the workpiece and collect large-particle welding slag, spatter, etc.

[0047] In this embodiment, the stop assembly 2 is fixed by at least one of a connecting member, a thread, a connecting hole, riveting, a fastener, a socket or a clamping structure. Specifically, one or several of the first stop structure 21a, the first stop structure 21b, the second stop structure 22 and the third stop structure 23 are fixed by at least one of a connecting member, a thread, a connecting hole, riveting, a fastener, a socket or a clamping structure. The detachable design can facilitate the user to clean the accumulated spatter in the assembly gap and the structural gap, and realize recycling.

[0048] In this embodiment, the anti-spatter structure of the laser processing head includes a trachea structure for delivering a protective gas, and the protective gas structure is coaxially communicated with the first channel 40.

[0049] In this embodiment, the splash-proof structure of the laser processing head may also adopt a trachea structure independently arranged with the first channel 40 to convey the shielding gas from one side of the nozzle 3 towards the processing position. During the processing, the shielding gas will flow back into the interior of the first channel 40. Preferably, a pneumatic balance portion 70 is provided between the protective mirror 1 and the nozzle 3 to balance the air pressure in the first channel 40 and eliminate the influence on the blocking performance of the first stop structure 21 and the second stop structure 22.

[0050] In this embodiment, at least part of the outer surface of the stop assembly is coated with an adsorption layer. Specifically, the outer surface of one or several of the first stop structure 21, the second stop structure 22, and the third stop structure 23 facing the nozzle 3 is provided with an adsorption layer. The adsorption layer may be a non-smooth surface with the Coanda effect formed on the outer surface, or a viscous coating or film coated to reduce the attachment of splashed welding slag on its surface.

[0051] Optionally, the above-mentioned adsorption layer substances may be: oil-based, water-based, and coating substances such as silicone oil and anti-clogging solvent.

[0052] Optionally, lubricating substances such as silicone oil are coated on the inner wall of the first channel 40 to facilitate the user to quickly clean the blocked welding slag and other splashes.

[0053] In this embodiment, a splash-proof coating layer that can improve the damage threshold of the lens is directly provided on the protective mirror 1. The laser can directly penetrate the coating layer and the beam path and beam quality do not change. The coating layer can be used to prevent the protective mirror from being burned through and is easy to erase. When it is found that dust falls on the lens and affects the welding or cutting performance, it can be taken down and wiped clean.

[0054] In this embodiment, the protective mirror 1 can also indirectly improve the damage threshold of the lens by setting a fourth stop structure on its surface. When the laser passes through the fourth stop structure, a fourth through hole is opened on its surface, and the fourth through hole is completely adapted to the scanning form of the laser, which can prevent dust from falling on the protective mirror.

[0055] In this embodiment, the splash-proof structure of the laser processing head involved in the present application is a laser cutting or laser welding device. Structures such as a lens barrel, a cooling member, and a ceramic ring are selectively provided between the protective mirror 1 and the nozzle 3. The lens barrel, the cooling member, and the ceramic ring are assembled to form the first channel 40 structure. The stop assembly 2 can be selectively provided on one or several of the lens barrel, the cooling member, and the ceramic ring, which will not be elaborated in detail here.

[0056] Furthermore, the gas delivery member 50 and the gas suction member 60 can be selectively provided on one or several of the lens barrel, the cooling member, and the ceramic ring.

[0057] In this embodiment, the anti-spatter structure of the laser processing head involved in the present application is a hand-held or automatic laser welding, cleaning, cutting and other processing heads. A gun-barrel structure with a certain length is arranged between the nozzle 3 and the protective mirror 1, and the first channel 40 is arranged on the gun-barrel structure.

[0058] Furthermore, a protective film layer can be selectively plated on the protective mirror 1, with a hollowed-out area corresponding to the laser scanning pattern reserved for normal processing. The protective film layer can, to a certain extent, prevent spatter from damaging the main body of the protective mirror lens. Optionally, a lubricating substance such as silicone oil is coated on the surface of the protective film layer.

[0059] The structure of the present application for blocking spatter can not only achieve the protective effect on the protective mirror 1 but also effectively reduce spatter and lower the later maintenance cost of users, having better economic benefits.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A splash-proof structure for a laser processing head, characterized in that, Comprising: Protective mirror; Nozzle; the protective mirror and the nozzle are located at both ends of a first channel for transmitting laser; Stop assembly, provided between the protective mirror and the nozzle, the stop assembly includes at least one first stop structure, and the arrangement form of the first stop structure can enable the laser to pass through the first channel without obstruction.

2. The anti-spatter structure of the laser processing head according to claim 1, wherein Part or all of the first stop structure is a permanent magnet and / or an electromagnet, and the permanent magnet and / or the electromagnet is arranged at a position close to the nozzle or the protective mirror, or arranged on the nozzle or the protective mirror.

3. The anti-spatter structure of the laser processing head according to claim 1, wherein, Part or all of the first stop structure is arranged inside or outside the first channel; and When the first stop structure is located in the first channel, the first stop structure has a first through hole coaxially arranged with the first channel.

4. The anti-spatter structure of the laser processing head according to claim 1, characterized in that, The stop assembly includes a second stop structure, the second stop structure is located in the first channel, and has an annular groove forming a preset angle with the central axis of the first channel; or, an annular groove is recessed on one side of the second stop structure facing the nozzle; The second stop structure has a second through hole coaxially arranged with the first channel, and the axial cross-section of the second through hole is rectangular, conical or inverted conical.

5. The anti-spatter structure of the laser processing head according to claim 1, wherein, The stop assembly includes a third stop structure, the third stop structure is provided between the first stop structure and the nozzle, the third stop structure is plate-shaped, and the third stop structure has a third through hole coaxially arranged with the first channel, and the third through hole is adapted to the scanning form of the laser.

6. The anti-spatter structure of the laser processing head according to claim 1, wherein, The anti-spatter structure of the laser processing head further includes a gas delivery member for delivering gas, and the gas delivery member is used to deliver gas along a direction forming a preset angle with the axis of the protective mirror; and / or, The anti-spatter structure of the laser processing head further includes a suction member, and the suction member is used to perform suction along a direction forming a preset angle with the axis of the protective mirror.

7. The anti-spatter structure of the laser processing head according to claim 1, characterized in that, The stop assembly is connected and fixed to the laser processing head by at least one of a connecting member, a thread, a connecting hole, riveting, a fastener, a socket or a clamping structure.

8. The anti-spatter structure of the laser processing head according to claim 1, characterized in that, At least part of the outer surface of the stop assembly is provided with an adsorption layer; The adsorption layer is a non-smooth surface layer with the Coanda effect; and / or, The adsorption layer is a sticky anti-spatter compound coating or a film.

9. The anti-spatter structure of the laser processing head according to claim 1, characterized in that, The protective mirror is provided with an anti-spatter coating layer or a fourth stop structure that can increase the damage threshold of the lens.

10. A laser processing head, characterized in that, The laser processing head includes the anti-spatter structure of the laser processing head according to any one of claims 1-9, and the laser processing head is one of a handheld laser welding head, an automatic laser welding device and an automatic laser cutting device.

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