Gas protection device, laser head and laser processing equipment

Abstract

The utility model discloses a gas protection device, a laser head and laser processing equipment. The gas protection device comprises a nozzle and a first gas knife. The nozzle is provided with a via hole and an air spraying hole, the via hole is used for allowing laser to pass through, and the propagation direction of the laser passing through the via hole is set as a first direction; one end of the gas spraying hole is communicated with the via hole, and the other end of the gas spraying hole is communicated with first positive pressure gas; the flowing direction of the first positive pressure gas in the gas orifices is set as a second direction, and the included angle between the second direction and the first direction is an acute angle or a right angle; the first air knife is connected with the nozzle, and the nozzle and the first air knife are arranged at intervals in the first direction; the first air knife is provided with a first air gap, and the first air gap is used for being communicated with second positive pressure gas; the projection of the air outlet of the via hole in the first direction can coincide with the first air curtain sprayed out of the first air seam. The gas protection device can effectively reduce the interference of gas flow on the stability of the molten pool.

Description

Technical Field

[0001] This application relates to the field of laser processing technology, and in particular to a gas protection device, a laser head, and laser processing equipment. Background Technology

[0002] Laser welding is a process that uses a high-power laser beam as a heat source, directly irradiating the surface of a material. This heat heats the surface and is transferred to the interior of the material, melting and fusing it to form a welded joint. Laser welding can be divided into pulsed laser welding and continuous laser welding. Based on its thermodynamic mechanism, it can be further divided into laser heat conduction welding and laser deep penetration welding (or laser deep penetration welding). Laser welding applications began in 1964, but initially were limited to welding thin, small parts using low-power pulsed solid-state lasers. Since the 1970s, with the advent of kilowatt-level high-power CO2 lasers, laser deep penetration welding has developed rapidly. Laser welding is now applied in important industrial sectors such as automotive, steel, aerospace, nuclear energy, and electrical and electronic industries.

[0003] When welding thick workpieces with high-power lasers, spatter will increase significantly. If no special treatment is taken, the lens in the laser head that is close to the workpiece is easily contaminated by spatter and dust, making the lens unusable.

[0004] In related technologies, airflow is used to carry away spatter and soot, thereby reducing the contamination of the lens by spatter and soot. However, airflow can easily affect the stability of the molten pool, leading to poor welding quality. Utility Model Content

[0005] Therefore, this application proposes a gas protection device that can effectively reduce the interference of gas flow on the stability of the molten pool.

[0006] This application also proposes a laser head having the aforementioned gas protection device.

[0007] This application also proposes a laser processing device having the aforementioned laser head.

[0008] A gas protection device according to a first aspect embodiment of this application includes:

[0009] The nozzle has a through hole and an air jet hole. The through hole is used for laser to pass through, and the propagation direction of the laser passing through the through hole is defined as a first direction. One end of the air jet hole is connected to the through hole, and the other end of the air jet hole is used to connect with a first positive pressure gas. The flow direction of the first positive pressure gas in the air jet hole is defined as a second direction, and the angle between the second direction and the first direction is an acute angle or a right angle.

[0010] A first air knife is connected to the nozzle, and the nozzle and the first air knife are spaced apart along the first direction; the first air knife is provided with a first air slit, which is used to communicate with a second positive pressure gas; the projection of the air outlet of the through hole along the first direction can coincide with the first air curtain ejected from the first air slit.

[0011] The gas protection device according to the embodiments of this application has at least the following beneficial effects: the angle between the second direction and the first direction is an acute angle or a right angle, so that the first positive pressure gas in the jet hole can flow along the propagation direction of the laser, thereby carrying the spatter and dust away from the source of the laser and playing a role in protecting the lens; the nozzle and the first air knife are arranged at intervals along the first direction, that is, the first air knife is located on the side of the nozzle outlet, and the projection of the outlet of the through hole along the first direction can coincide with the first air curtain ejected from the first air gap, so that the first positive pressure gas flowing out from the outlet will be effectively blocked by the first air curtain ejected from the first air gap, thereby reducing the first positive pressure gas flowing to the molten pool, making the molten pool less susceptible to interference and more stable.

[0012] According to some embodiments of this application, a plane perpendicular to the first direction is defined as a first plane, and the shape of the jet hole cut off by the first plane is annular.

[0013] According to some embodiments of this application, let the direction perpendicular to the inner surface of the jet hole be a third direction, and let the width d of the jet hole in the third direction satisfy the relationship 0.1≤d≤0.2, where the unit of d is millimeters.

[0014] According to some embodiments of this application, the nozzle is further provided with a first transfer chamber, and the other end of the jet hole is used to communicate with the first transfer chamber, which is used to communicate with the first positive pressure gas.

[0015] According to some embodiments of this application, the nozzle is further provided with an air supply hole, the air supply hole and the jet hole are spaced apart along the first direction, one end of the air supply hole is connected to the through hole; the other end of the air supply hole is used to introduce air, or the other end of the air supply hole is used to connect with a third positive pressure gas.

[0016] According to some embodiments of this application, the nozzle is further provided with a second transfer chamber, and the other end of the air supply hole is connected to the second transfer chamber; the second transfer chamber is used to introduce air, or the second transfer chamber is used to communicate with the third positive pressure gas.

[0017] According to some embodiments of this application, the distance between the nozzle and the first air knife along the first direction can be adjusted.

[0018] According to some embodiments of this application, the first air knife is provided with two or more first air slits, and the two or more first air slits are spaced apart along the first direction.

[0019] According to some embodiments of this application, it also includes:

[0020] The second air knife is connected to the nozzle, and the nozzle and the second air knife are spaced apart along the first direction; the second air knife is provided with a second air slit, which is used to communicate with a fourth positive pressure gas; the projection of the air outlet along the first direction can coincide with the second air curtain ejected from the second air slit.

[0021] According to some embodiments of this application, the distance between the nozzle and the second air knife along the first direction can be adjusted.

[0022] According to some embodiments of this application, the second air knife is provided with two or more second air slits, and the two or more second air slits are spaced apart along the first direction.

[0023] The laser head according to a second aspect embodiment of this application includes:

[0024] The main body includes a housing and a lens assembly, the lens assembly being mounted on the housing and used to adjust the laser;

[0025] In the aforementioned gas protection device, the nozzle is connected to the housing, and the through hole is used to receive the laser transmitted through the lens assembly.

[0026] The laser head according to the embodiments of this application has at least the following beneficial effects: by using the gas protection device described above, the interference of gas flow on the stability of the molten pool can be effectively reduced while protecting the lens group.

[0027] A laser processing apparatus according to a third aspect embodiment of this application includes:

[0028] A laser for generating the laser;

[0029] The aforementioned laser head, wherein the lens group is used to receive the laser generated by the laser.

[0030] The laser processing equipment according to the embodiments of this application has at least the following beneficial effects: by using the laser head described above, while protecting the lens group, the interference of airflow on the stability of the molten pool can be effectively reduced, and the processing effect of the laser processing equipment is better.

[0031] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0032] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0033] Figure 1 A perspective view of a gas protection device according to an embodiment of this application;

[0034] Figure 2 for Figure 1 Cross-sectional view of the gas protection device;

[0035] Figure 3 This is a schematic diagram of the projection of the air outlet along the first direction and the first air curtain;

[0036] Figure 4 This is a schematic diagram of the projection of the air outlet along the first direction and the second air curtain.

[0037] Figure 5 for Figure 1 Exploded view of a gas protection device;

[0038] Figure 6 A perspective view of the laser head according to an embodiment of this application;

[0039] Figure 7 This is a schematic diagram of a laser processing apparatus according to an embodiment of this application.

[0040] Reference numerals: Gas protection device 100, nozzle 110, inner ring 120, second inlet 121, fourth transfer chamber 122, second connecting hole 123, second transfer chamber 124, air supply hole 125, base 130, first inlet 131, third transfer chamber 132, first connecting hole 133, first transfer chamber 134, jet hole 135, lower shell 140, through hole 141, air outlet 142, projection 143, lower shell 140, connecting seat 150, slide rod 160, first air knife 170, first air slit 171, first air curtain 172, second air knife 180, second air slit 181, second air curtain 182, first plane 190;

[0041] Body 200, housing 210, lens group 220;

[0042] Laser 300;

[0043] Laser 400. Detailed Implementation

[0044] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0045] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0046] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number, and "above," "below," "within," etc., are understood to exclude the stated number. If "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0047] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0048] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] Reference Figures 1 to 3 According to a first aspect embodiment of this application, a gas protection device 100 includes a nozzle 110 and a first gas knife 170. The nozzle 110 is provided with a through hole 141 and a jet hole 135 (see reference). Figure 2 Via 141 is used for the laser 300 to pass through. Let the propagation direction of the laser 300 passing through via 141 be the first direction (refer to...). Figure 2 (For example, the first direction is downward). One end of the jet orifice 135 is connected to the through hole 141, and the other end of the jet orifice 135 is used to connect with the first positive pressure gas. Let the flow direction of the first positive pressure gas in the jet orifice 135 be the second direction, and the angle between the second direction and the first direction be an acute angle or a right angle.

[0050] The first air knife 170 is connected to the nozzle 110, and the nozzle 110 and the first air knife 170 are spaced apart along a first direction. The first air knife 170 is provided with a first air slit 171, which is used to communicate with a second positive pressure gas. The projection 143 of the air outlet 142 of the through hole 141 along the first direction can coincide with the first air curtain 172 ejected from the first air slit 171 (see reference). Figure 3 ).

[0051] The gas protection device 100 according to the embodiments of this application has at least the following beneficial effects: the angle between the second direction and the first direction is an acute angle or a right angle, so that the first positive pressure gas in the jet hole 135 can flow along the propagation direction of the laser 300, thereby carrying the spatter and dust away from the source position of the laser 300, thus protecting the lens; the nozzle 110 and the first air knife 170 are arranged at intervals along the first direction, that is, the first air knife 170 is located on the side of the nozzle 110 outlet, and the projection 143 of the outlet 142 of the through hole 141 along the first direction can coincide with the first air curtain 172 ejected from the first air gap 171, so that the first positive pressure gas flowing out from the outlet 142 will be effectively blocked by the first air curtain 172 ejected from the first air gap 171, thereby reducing the first positive pressure gas flowing to the molten pool, making the molten pool less susceptible to interference, and making the molten pool more stable.

[0052] In addition, the first air curtain 172 is located between the molten pool and the source of the laser 300, so the first air curtain 172 also has the function of blocking splashes and smoke.

[0053] Specifically, the first positive pressure gas can be air, nitrogen, or argon, preferably air, to reduce production costs. The second positive pressure gas can also be air, nitrogen, or argon, preferably air, to reduce production costs.

[0054] Specifically, the angle between the second direction and the first direction can be 30 degrees, 45 degrees, 60 degrees, 80 degrees, 90 degrees or other angles.

[0055] Reference Figure 2 In some embodiments of this application, a plane perpendicular to the first direction is defined as a first plane 190, and the shape of the jet hole 135 cut off by the first plane 190 is annular.

[0056] The jet nozzle 135 is cut into an annular shape by the first plane 190, so that the jet nozzle 135 can spray out an annular third air curtain, which can better block splashes and smoke that attempt to enter the through hole 141, and the protective effect of the gas protection device is better.

[0057] Specifically, the shape of the jet hole 135 cut off by the first plane 190 can be circular or elliptical.

[0058] It should be noted that when the angle between the second direction and the first direction is acute, in this embodiment, the jet orifice 135 is generally conical. When the jet orifice 135 is generally conical, the flow direction of the first positive pressure gas at various positions of the jet orifice 135 will be inconsistent, but it is acceptable as long as the angle between the first direction and the second direction at each position is acute.

[0059] Reference Figure 2 In the improved scheme of the above embodiment, the direction perpendicular to the inner surface of the jet hole 135 is defined as the third direction, and the width d of the jet hole 135 in the third direction satisfies the relationship 0.1≤d≤0.2, where the unit of d is millimeters.

[0060] The width d of the jet hole 135 in the third direction satisfies the relationship 0.1≤d≤0.2. At this time, the jet hole 135 is relatively narrow. When the first positive pressure gas passes through the jet hole 135, it can convert pressure potential energy into kinetic energy. As a result, the first positive pressure gas ejected from the jet hole 135 can obtain a larger flow velocity. The first positive pressure gas has a stronger ability to blow away splashes and smoke, and the protective effect of the gas protection device is better.

[0061] It should be noted that when the jet hole 135 is conical in shape, the third direction of each position on the inner surface of the jet hole 135 will be different, but as long as the width d of each position of the jet hole 135 satisfies the relationship 0.1≤d≤0.2, it is acceptable.

[0062] Specifically, the width d can be 0.1mm, 0.12mm, 0.15mm, 0.18mm, 0.2mm or other values.

[0063] Reference Figure 2 In some embodiments of this application, the nozzle 110 is further provided with a first transfer chamber 134, and the other end of the jet hole 135 is used to communicate with the first transfer chamber 134, which is used to communicate with a first positive pressure gas.

[0064] By setting the first transfer chamber 134, the pressure of the first positive pressure gas flowing into the jet hole 135 at various locations can be made more consistent, and the ability of the first positive pressure gas ejected from the jet hole 135 to blow away splashes and smoke is more uniform, making the protective effect of the gas protection device more stable.

[0065] Reference Figure 1 and Figure 2In some embodiments of this application, the nozzle 110 is further provided with a first connecting hole 133, a third transfer chamber 132, and a first inlet 131. The first inlet 131, the third transfer chamber 132, the first connecting hole 133, and the first transfer chamber 134 are connected in sequence. The first inlet 131 is used to communicate with the first positive pressure gas. The function of the third transfer chamber 132 is similar to that of the first transfer chamber 134. The third transfer chamber 132 is used to make the pressure of the first positive pressure gas entering the first connecting hole 133 more uniform.

[0066] Two or more first connecting holes 133 may be provided, and the two or more first connecting holes 133 are spaced apart around the through hole 141. Specifically, the number of first connecting holes 133 may be 6 to 12.

[0067] Reference Figure 5 In the improved embodiment described above, to facilitate the processing of the first inlet 131, the third transfer chamber 132, the first connecting hole 133, the first transfer chamber 134, and the jet nozzle 135, the nozzle 110 includes a base 130 and a lower shell 140. The base 130 and the lower shell 140 are connected by fasteners (bolts, nuts, etc.). After the base 130 and the lower shell 140 are processed separately, they are then connected together, thereby forming the first inlet 131, the third transfer chamber 132, the first connecting hole 133, the first transfer chamber 134, and the jet nozzle 135 between the base 130 and the lower shell 140.

[0068] Reference Figure 2 In some embodiments of this application, the nozzle 110 is further provided with an air supply hole 125. The air supply hole 125 and the jet hole 135 are spaced apart along a first direction. One end of the air supply hole 125 is connected to the through hole 141. The other end of the air supply hole 125 is used to introduce air, or the other end of the air supply hole 125 is used to communicate with a third positive pressure gas.

[0069] When the jet nozzle 135 ejects the first positive pressure gas, it will introduce the laser 300 into one end of the through-hole 141 (refer to...). Figure 2 If a negative pressure is formed at the upper end of the via 141 (i.e., the end of the via 141 into which the laser 300 is introduced), the first positive pressure gas ejected from the jet hole 135 is prone to become disordered, resulting in poor blocking effect of the first positive pressure gas on splashes and smoke.

[0070] By providing an air supply hole 125 in the nozzle 110, air or third positive pressure gas can be introduced into the through hole 141 in a timely manner, thereby making the first positive pressure gas ejected from the jet hole 135 more stable and the first positive pressure gas has a better blocking effect on splashes and smoke.

[0071] Specifically, the third positive pressure gas can be air, nitrogen, or argon, with air being preferred to reduce production costs.

[0072] Reference Figure 2 In the improved embodiment described above, the nozzle 110 is further provided with a second transfer chamber 124, and the other end of the air supply hole 125 is connected to the second transfer chamber 124; the second transfer chamber 124 is used to introduce air, or the second transfer chamber 124 is used to communicate with a third positive pressure gas.

[0073] By setting the second transfer chamber 124, the pressure of the third positive pressure gas flowing into each position in the air supply port 125 can be made more consistent, and the flow rate of the third positive pressure gas entering the through hole 141 from the air supply port 125 can be more uniform, thereby making the flow of the first positive pressure gas ejected from the jet port 135 more stable.

[0074] Reference Figure 1 and Figure 2 In some embodiments of this application, the nozzle 110 is further provided with a second connecting hole 123, a fourth transfer chamber 122, and a second inlet 121. The second inlet 121, the fourth transfer chamber 122, the second connecting hole 123, and the second transfer chamber 124 are sequentially connected. The second inlet 121 is used to communicate with the third positive pressure gas. The function of the fourth transfer chamber 122 is similar to that of the second transfer chamber 124. The fourth transfer chamber 122 is used to make the pressure of the third positive pressure gas entering the second connecting hole 123 more uniform.

[0075] Two or more second connecting holes 123 may be provided, and the two or more second connecting holes 123 are spaced apart around the through hole 141. Specifically, the number of second connecting holes 123 may be 6 to 12.

[0076] Reference Figure 5 In the improved embodiment described above, to facilitate the machining of the second inlet 121, the fourth transfer chamber 122, the second connecting hole 123, the second transfer chamber 124, and the air supply hole 125, the nozzle 110 includes an inner ring 120. The inner ring 120 and the seat 130 are connected by fasteners (bolts, nuts, etc.). After the inner ring 120 and the seat 130 are machined separately, they are then connected together, thereby forming the second inlet 121, the fourth transfer chamber 122, the second connecting hole 123, the second transfer chamber 124, and the air supply hole 125 between the seat 130 and the lower shell 140.

[0077] Reference Figure 5 In some embodiments of this application, the distance between the nozzle 110 and the first air knife 170 along a first direction can be adjusted.

[0078] By adjusting the distance between the nozzle 110 and the first air knife 170 along the first direction, the first air curtain 172 generated by the first air knife 170 can block the first positive pressure gas ejected from the nozzle 110 at a suitable distance, thereby achieving a better processing effect.

[0079] For example, when the distance between the nozzle 110 and the first air knife 170 along the first direction is too small, the flow velocity of the first positive pressure gas ejected from the nozzle 110 has not yet decreased rapidly, and the first positive pressure gas ejected from the nozzle 110 can easily penetrate the first air curtain 172. In this case, the distance between the nozzle 110 and the first air knife 170 along the first direction can be increased. After the flow velocity of the first positive pressure gas ejected from the nozzle 110 decreases, it will collide with the first air curtain 172, thereby making the first air curtain 172 more effective in blocking the first positive pressure gas ejected from the nozzle 110.

[0080] In addition, by adjusting the distance between the nozzle 110 and the first air knife 170 along the first direction, the distance between the first air knife 170 and the molten pool can also be indirectly adjusted, thereby preventing the first air knife 170 from getting too close to the molten pool.

[0081] Specifically, refer to Figure 5 The gas protection device also includes a slide rod 160, one end of which is connected to the nozzle 110. The first air knife 170 has a groove, in which the slide rod 160 is placed, and the first air knife 170 and the slide rod 160 are fixed together by a set screw. Thus, by loosening the set screw, the distance between the nozzle 110 and the first air knife 170 along the first direction can be adjusted. After moving to the desired position, the set screw is tightened again to complete the adjustment.

[0082] In another embodiment, two or more first through holes may be provided on the slide rod 160, and the two or more first through holes may be spaced apart along the first direction. The first air knife 170 is provided with a second through hole. After the bolt passes through the second through hole and one of the first through holes, it engages with the nut threadedly, thereby connecting the first air knife 170 and the slide rod 160. By loosening the nut and moving the first air knife 170 along the first direction, allowing the bolt to pass through the desired first through hole, the distance between the nozzle 110 and the first air knife 170 along the first direction can be adjusted.

[0083] In another embodiment, the two or more first through holes on the slide bar 160 can also be replaced by waist-shaped holes, with other structures the same as in the previous embodiment, thereby enabling the adjustment of the distance between the nozzle 110 and the first air knife 170 along the first direction.

[0084] Reference Figure 2 In some embodiments of this application, the first air knife 170 is provided with two or more first air slits 171, and the two or more first air slits 171 are spaced apart along a first direction.

[0085] By setting two or more first air gaps 171, the blocking effect of the first air curtain 172 is better, and the first positive pressure gas ejected from the jet hole 135 has less interference with the molten pool.

[0086] Specifically, the number of first air gaps 171 can be two, three, or other numbers.

[0087] Reference Figure 2 and Figure 4 In some embodiments of this application, the gas protection device further includes a second air knife 180, which is connected to a nozzle 110. The nozzle 110 and the second air knife 180 are spaced apart along a first direction. The second air knife 180 is provided with a second air slit 181 for communicating with a fourth positive pressure gas. The projection 143 of the outlet 142 along the first direction can coincide with the second air curtain 182 ejected from the second air slit 181.

[0088] By adding a second air knife 180, the second air curtain 182 can further block the first positive pressure gas ejected from the air jet 135, and the first positive pressure gas ejected from the air jet 135 has less interference with the molten pool.

[0089] Reference Figure 2 In the improved embodiment described above, the distance between the nozzle 110 and the second air knife 180 along the first direction can be adjusted.

[0090] By adjusting the distance between the nozzle 110 and the second air knife 180 along the first direction, the second air curtain 182 generated by the second air knife 180 can block the first positive pressure gas ejected from the nozzle 110 at a suitable distance, thereby achieving a better processing effect.

[0091] Specifically, refer to Figure 5 The gas protection device also includes a connecting seat 150. The second air knife 180 is fixed to the slide rod 160 by fasteners. The slide rod 160 is slidably connected to the connecting seat 150, and the sliding direction of the slide rod 160 relative to the connecting seat 150 is a first direction. The connection structure between the slide rod 160 and the connecting seat 150 is the same as the connection structure between the first air knife 170 and the slide rod 160, and will not be described again here.

[0092] Reference Figure 2 In the improved embodiment described above, the second air knife 180 is provided with two or more second air slits 181, which are spaced apart along the first direction.

[0093] By setting two or more second air gaps 181, the blocking effect of the first air curtain 172 is better, and the first positive pressure gas ejected from the air jet 135 has less interference with the molten pool.

[0094] Specifically, the number of second air gaps 181 can be two, three, or other numbers.

[0095] Reference Figure 6According to a second aspect embodiment of this application, a laser head includes a body 200 and a gas protection device 100. The body 200 includes a housing 210 and a lens assembly 220, the lens assembly 220 being mounted on the housing 210 and used for adjusting laser 300. A nozzle 110 is connected to the housing 210, and a through hole 141 is used to receive laser 300 transmitted through the lens assembly 220.

[0096] The laser head according to the embodiments of this application has at least the following beneficial effects: by using the gas protection device 100 described above, the interference of gas flow on the stability of the molten pool can be effectively reduced while protecting the lens group 220.

[0097] Specifically, the nozzle 110 is typically fixedly connected to the housing 210 by fasteners. The lens assembly 220 typically includes a collimating lens and a focusing lens, etc.

[0098] Reference Figure 7 A laser processing apparatus according to a third aspect embodiment of this application includes a laser 400 and a laser head. The laser 400 is used to generate laser light 300. A lens group 220 is used to receive the laser light 300 generated by the laser 400.

[0099] The laser processing equipment according to the embodiments of this application has at least the following beneficial effects: by using the laser head described above, while protecting the lens group 220, the interference of airflow on the stability of the molten pool can be effectively reduced, and the processing effect of the laser processing equipment is better.

[0100] Specifically, laser processing equipment can be laser welding equipment, laser repair equipment, or laser cladding equipment.

[0101] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A gas protection device, characterized by, The nozzle is provided with a through hole for the laser to pass through, and the propagation direction of the laser passing through the through hole is the first direction; one end of the air jet hole is communicated with the through hole, and the other end of the air jet hole is used for being communicated with the first positive pressure gas; the flow direction of the first positive pressure gas in the air jet hole is the second direction, and the included angle between the second direction and the first direction is an acute angle or a right angle; The first air knife is connected with the nozzle, and the nozzle and the first air knife are arranged along the first direction; the first air knife is provided with a first air slit for being communicated with the second positive pressure gas; the projection of the air outlet of the through hole along the first direction can coincide with the first air curtain sprayed by the first air slit. The plane perpendicular to the first direction is the first plane, and the shape of the air jet hole intercepted by the first plane is annular.

2. The gas guard of claim 1, wherein The direction perpendicular to the inner surface of the air jet hole is the third direction, and the width d of the air jet hole in the third direction satisfies the relationship 0.1≤d≤0.2, wherein the unit of d is millimeter.

3. The gas guard of claim 2, wherein The nozzle is also provided with a first transfer cavity, and the other end of the air jet hole is used for being communicated with the first transfer cavity; the first transfer cavity is used for being communicated with the first positive pressure gas.

4. The gas guard of claim 1, wherein The nozzle is also provided with a supplementary air hole, and the supplementary air hole and the air jet hole are arranged along the first direction; one end of the supplementary air hole is communicated with the through hole; the other end of the supplementary air hole is used for introducing air, or the other end of the supplementary air hole is used for being communicated with the third positive pressure gas.

5. The gas guard according to any one of claims 1 to 4, characterized in that, The nozzle is also provided with a second transfer cavity, and the other end of the supplementary air hole is communicated with the second transfer cavity; the second transfer cavity is used for introducing air, or the second transfer cavity is used for being communicated with the third positive pressure gas.

6. The gas guard of claim 5, wherein The distance between the nozzle and the first air knife along the first direction can be adjusted.

7. The gas guard of claim 1, wherein The first air knife is provided with two or more first air slits, and the two or more first air slits are arranged along the first direction.

8. The gas guard of claim 1, wherein The second air knife is connected with the nozzle, and the nozzle and the second air knife are arranged along the first direction; the second air knife is provided with a second air slit for being communicated with the fourth positive pressure gas; the projection of the air outlet along the first direction can coincide with the second air curtain sprayed by the second air slit.

9. The gas guard of any one of claims 1, 7 and 8, wherein, The distance between the nozzle and the second air knife along the first direction can be adjusted. The second air knife is provided with two or more second air slits, and the two or more second air slits are arranged along the first direction.

10. The gas guard of claim 9, wherein The body includes a shell and a lens group, the lens group is mounted on the shell, and the lens group is used for adjusting the laser; 11. The gas guard of claim 9, wherein The gas protection device in any one of claims 1 to 11, wherein the nozzle is connected with the shell, and the through hole is used for receiving the laser passing through the lens group.

12. A laser head characterised in that, The laser is used for generating the laser; The laser head in claim 12, wherein the lens group is used for receiving the laser generated by the laser. ​ 13. Laser processing apparatus, characterized in that ​ ​ ​

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