CN114346487B - Gas conveying gas circuit system for laser processing equipment - Google Patents

Abstract

The invention relates to the technical field of laser processing, and discloses a gas conveying gas circuit system for laser processing equipment, which comprises a cooling gas circuit and a protection gas circuit, wherein the cooling gas circuit integrally covers the part of the laser processing equipment except for a spray pipe assembly, and the front end of the protection gas circuit is communicated with the inside of the spray pipe assembly. The cooling gas in the cooling gas path is led into the spray pipe assembly after passing through the optical assembly and sprayed out of the spray pipe to cool the whole optical assembly and the optical lens, the protective gas in the protective gas path is led into the spray pipe assembly to cool the spray pipe assembly and blow off smoke dust generated on a workpiece to be processed; the combination of the two air paths ensures the full air-cooled design, is beneficial to reducing the weight of the laser processing head, and cools devices inside the laser processing head.

Description

Gas conveying gas circuit system for laser processing equipment

[ Field of technology ]

The embodiment of the invention relates to the technical field of laser air cooling, in particular to a gas conveying gas circuit system for laser processing equipment.

[ Background Art ]

The laser welding is a novel welding mode which takes the focused high-energy laser beam as a heating source, and has the advantages of small heat input, low welding deformation quantity, high welding seam strength, non-contact operation, rich welding types, easy automatic and intelligent processing, high welding speed, high welding precision, large welding depth-to-width ratio and the like, and has been widely applied to the manufacturing fields of automobiles, engineering machinery, airplanes, household appliances, high-speed rails, ships, 3C electronics and the like. The complete laser welding equipment or platform generally comprises a laser source, a laser transmission device, a laser welding head, a motion control system, a welding machine tool and the like, and the motion control system for fixing a workpiece to be welded by the machine tool drives the laser welding head to finish relative motion for processing, so that the complete platform type welding equipment is often large in size, heavy in weight, complex in structure and high in cost, and is suitable for large enterprises of batch processing operation.

In order to expand the application of laser processing to wider users, a handheld laser welding device is generated, and a welding processing head is held by a human hand to finish relative motion to carry out welding processing, so that a complex and huge motion control system and a machine tool are omitted, and the portable laser welding device can be manufactured. Through years of development, the handheld laser welding has the advantages of small volume, light weight, low cost, flexible processing mode, wide application range and the like besides the advantages of laser welding, has quite cost performance advantages with the traditional welding equipment such as arc welding, argon arc welding and the like, and is widely focused and applied gradually.

The important components of the handheld laser welding equipment are a laser and a handheld laser welding head, the laser has little phase difference with the platform type processing, but the welding head used as the handheld processing application requires small volume, light weight, high reliability and easy operation compared with the platform type processing, and particularly, the welding head has small volume and weight and is suitable for being held by a person to finish the welding processing. The common integrated laser output head and welding head equipment are cooled by cooling water, so that the risk of water leakage exists, the integrated laser output head and the welding head equipment are large in volume and weight and high in cost, and dust generated on workpieces to be welded easily pollutes protective lenses inside the integrated laser output head and the welding head equipment, so that the integrated laser output head and the welding head equipment are damaged.

It is therefore necessary to design a laser machining air cooling system for cooling the optical components of the laser machining head and blowing off the fumes generated at the workpieces to be welded.

[ Invention ]

The embodiment of the invention aims to provide a gas conveying gas circuit system for laser processing equipment, the full air-cooled design is beneficial to the laser processing head from being polluted by processing smoke dust, and the optical components inside the laser processing head are cooled.

The technical scheme adopted by the embodiment of the invention for solving the technical problems is as follows:

the gas conveying gas circuit system for the laser processing equipment comprises a cooling gas circuit and a protection gas circuit, wherein the cooling gas circuit integrally coats the periphery of the part of the laser processing equipment except for the spray pipe assembly, and the front end of the protection gas circuit is communicated with the inside of the spray pipe assembly.

Preferably, the cooling gas path entirely covers an interlayer space at the periphery of the part of the laser processing device except for the spray pipe assembly, and the cooling gas of the cooling gas path fills the entire interlayer space.

Preferably, the cooling air path further comprises a cooling channel arranged around the periphery of the optical lens of the laser processing device, and the cooling channel is communicated with the interlayer space.

Preferably, the cooling channel is U-shaped, rectangular or semicircular.

As a preferred scheme, the cooling gas circuit is provided with a gas wall generator, the gas wall generator comprises a plurality of gas outlet channels which are arranged at intervals on the periphery of a light-passing channel of the laser processing equipment, the plurality of gas outlet channels are all arranged to incline from the periphery to the axis of the light-passing channel and are communicated with the light-passing channel, and the inclined angles of the gas outlet channels of the gas wall generator are the same.

Preferably, the protection gas path includes at least one air inlet channel communicated with the internal channel of the spray pipe assembly, and when the protection gas in the protection gas path flows into the spray pipe assembly through the air inlet channel, a component speed is obtained in a tangential direction of the internal channel under the action of the air inlet channel, so that the protection gas generates a spiral airflow in the spray pipe assembly.

Preferably, the air inlet channel is obliquely arranged; or the air inlet channel is spirally arranged around the axis of the internal channel; or the air inlet channel is arranged in an arc shape around the axis of the internal channel.

The beneficial effects of the invention are as follows: the gas conveying gas circuit system is provided with a cooling gas circuit and a protection gas circuit, wherein cooling gas in the cooling gas circuit is led into the spray pipe assembly through the periphery of the laser processing equipment and the optical assembly and sprayed out of the spray pipe, and is used for cooling the whole optical assembly and the optical lens, and the protection gas in the protection gas circuit is led into the spray pipe assembly to cool the spray pipe assembly and blow off smoke dust generated on a workpiece to be processed; the combination of the two air paths ensures the full air-cooled design, is beneficial to reducing the weight of the laser processing head, and cools devices inside the laser processing head. The design of the double air paths not only realizes the cooling and protection of the optical component, but also adjusts the relative proportion of the air flow of the air in the cooling air path and the air flow of the air in the protection air path according to the processing requirements, and can fully utilize the external air flow.

[ Description of the drawings ]

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to scale, unless expressly stated otherwise.

Fig. 1 is a schematic diagram illustrating connection between a laser welding gun and a laser according to an embodiment of the invention.

Fig. 2 is a schematic diagram of the overall structure of a laser welding gun according to an embodiment of the invention.

Fig. 3 is an exploded view of the laser welding gun according to the embodiment shown in fig. 2.

Fig. 4 is a schematic diagram of a cooling air path connection structure of the laser welding gun according to the embodiment shown in fig. 2.

Fig. 5 is a schematic view of the arrangement of the cooling channel of the laser welding gun on the movable mounting member according to the embodiment shown in fig. 2.

Fig. 6 is a schematic diagram of a front section of a gas conveying path system of the laser welding gun according to the embodiment shown in fig. 2.

Fig. 7 is a schematic view of an air wall ring of the laser welding gun according to the embodiment shown in fig. 2.

Fig. 8 is a schematic view of another structure of the gas wall ring of the laser welding gun according to the embodiment shown in fig. 2.

Fig. 9 is a schematic view of the nozzle assembly of the laser torch of the embodiment of fig. 2.

FIG. 10 is a schematic cross-sectional view of the spout assembly of FIG. 9.

FIG. 11 is a schematic view of the nozzle base of the nozzle assembly of FIG. 9.

Fig. 12 is a schematic view of the laser welding gun of the embodiment shown in fig. 2, with a wire feeding assembly.

[ Detailed description ] of the invention

In order that the invention may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to "/" affixed "to" another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and the like are used in this specification for purposes of illustration only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

In addition, the technical features mentioned in the different embodiments of the invention described below can be combined with one another as long as they do not conflict with one another.

The technical scheme and technical characteristics of the laser processing device in the embodiment of the invention are specifically described by taking the laser welding gun as an example, but the technical scheme of the invention is not limited to being practically applied to the laser welding gun, has the same, similar or partially the same structural characteristics and working components as the laser welding gun, or has the same working principle and application scene as the laser welding gun, such as a laser cutting gun, a laser cleaning gun and the like, and can be also applied to the laser processing devices.

As shown in fig. 1, in order to solve the above-mentioned problems, an embodiment of the present invention provides a laser welding gun 200, and a laser 100 is connected to a laser output head assembly of the laser welding gun 200 through an optical fiber to input laser to the laser welding gun 200.

Referring to fig. 2, a laser welding gun is schematically disclosed, the overall shape of which includes an execution portion, a body portion and a hand-held portion, the execution portion and the body portion are horizontally arranged, and the hand-held portion is obliquely arranged, so that the laser welding gun is approximately pistol-shaped, so as to conform to the ergonomic design, and facilitate the hand-held operation.

As shown in fig. 2 and 3, the laser welding gun structurally comprises a spray pipe assembly 2, a base 1, an optical lens assembly 3, a laser output head assembly 4 and a gas conveying gas path system 5. The base 1 correspondingly comprises a body part and a hand-held part, and the spray pipe assembly 2 is an executing part.

The base 1 is an integral structural member with an integrated design, the base 1 comprises a horizontal section 11 and an inclined section 12, and the base 1 is provided with an inner cavity which integrally penetrates through the horizontal section 11 and the inclined section 12. The upper portion of the inclined section 12 is a containing section 13, the inclined section 12 is connected with the horizontal section 11 through the containing section 13, the spray pipe assembly 2 is arranged at the front end of the horizontal section of the base 1, the optical lens assembly 3 and the laser output head assembly 4 are integrally arranged in the inner cavity of the base 1, and the laser output head assembly 4 and the base 1 form an integral component.

The optical lens assembly 3 comprises a protection mirror module 31, a focusing mirror module 32, a reflecting mirror module 33 and a collimating mirror module 34, wherein the protection mirror module 31 and the focusing mirror module 32 are arranged on the horizontal section 11 of the base 1, the protection mirror module 31 is positioned in front of the focusing mirror module 32, the reflecting mirror module 33 and the collimating mirror module 34 are arranged on the accommodating section 13 of the base 1, the reflecting mirror module 33 is positioned at the rear of the focusing mirror module 32, the collimating mirror module 34 is positioned below the reflecting mirror module 33, the laser output head assembly 4 is arranged on the inclined section 12 of the base 1 and is positioned at the rear of the collimating mirror module 34, and the gas conveying gas circuit system 5 is led in from the rear end of the base 1, is arranged along the base 1 and is led out from the front end of the base 1to be communicated with the internal channel of the spray pipe assembly 2.

The inside of the base 1 is provided with a light-passing channel which is arranged along the horizontal section 11 and the inclined section 12 of the base 1. The laser beam output from the laser output head assembly 2 is collimated, reflected and focused by the collimator lens module 34, the reflector lens module 33 and the focusing lens module 32 in the light passage, and then is emitted from the nozzle of the nozzle assembly 2 through the internal passage of the nozzle assembly 2 to act on the object to be welded.

Referring to fig. 3 and 9, the nozzle assembly 2 is connected to the front end of the base 1 through a barrel holder 21 thereof, and an internal passage 24 penetrating through the front and rear ends of the nozzle assembly 2 is provided in the interior of the nozzle assembly 2, and the internal passage 24 communicates with the light passage of the base 1. The rear end of the gun tube holder 21 is provided with a connecting assembly, and the spray tube assembly 2 is connected with the front end of the base 1 through the connecting assembly. Specifically, the connecting assembly comprises a flange plate, an insulating sheet and bolts, wherein the bolts sequentially penetrate through the flange plate and the insulating sheet to be matched with threaded holes formed in the front end face of the base, so that fastening connection is formed.

As shown in fig. 3, the protection mirror module 31 is disposed in front of the focusing mirror module 32, and the protection mirror module 31 is mainly used for blocking particulate matters such as smoke dust, splashes and the like that enter the light-passing channel of the base 1 from the inner channel 24 of the nozzle assembly 2 on a probabilistic basis, so as to prevent the matters from contacting the focusing mirror module 32, and cause pollution damage to the focusing mirror, so as to protect the focusing mirror.

The protection mirror module 31, the focusing mirror module 32 and the collimating mirror module 34 are detachably mounted in the base 1 through a first mounting structure. The first mounting structure comprises a guiding fixing part and a movable mounting piece 35 matched with the guiding fixing part in a sliding clamping manner, wherein the guiding fixing part is arranged in an inner cavity of the base 1 so as to limit and fix the movable mounting piece 35, the movable mounting piece 35 is used for respectively and correspondingly mounting optical lenses of the protective lens module, the focusing lens module and the collimating lens module, and the optical lenses are mounted in the movable mounting piece 35.

Since the movable mounting piece 35 can be freely taken out or assembled from the guiding fixing part, when the optical lens is replaced or maintained, the optical lens can be replaced or maintained only by independently taking out the movable mounting piece 35 corresponding to the optical module which needs to be replaced or maintained from the guiding fixing part and taking out the optical lens which is arranged in the movable mounting piece 35 for replacing or maintaining the optical lens, and the whole base 1 is not required to be detached or all the optical modules are detached, so that the replacement and maintenance of the optical lens of each optical module are more convenient and quicker, and the maintenance time is saved.

As shown in fig. 3 and 5, specifically, the guiding fixing portion may be a guiding groove disposed around an inner wall of the light-passing channel of the base 1, the movable mounting member 35 may be a box body with a hollow middle portion, the hollow portion of the box body forms the light-passing opening 350, the optical lens is mounted in the box body, and the box body is movably clamped in the guiding groove to form a drawer structure.

In order to improve the tightness of the cooperation installation of the movable mounting piece 35 and the guiding fixing part, a sealing ring can be arranged between the movable mounting piece 35 and the guiding fixing part, for example, the sealing ring is arranged on the side wall of the guiding groove, or the sealing ring is arranged on two opposite end faces of the box body, the sealing ring can improve the tightness and tightness of the two cooperation, so that the gas leakage in the gas conveying gas circuit system is prevented, the cooling effect of the cooling gas circuit is reduced, and meanwhile, particles such as smoke dust and splashes entering the inner cavity of the base 1 can be prevented from contacting the optical lens, so that the optical lens is polluted and damaged.

In addition, still be equipped with contact sensor on the direction fixed part of every optical module mounted position department for whether the response monitoring movable mounting piece assembles in place, whether this is come the inspection protection mirror module, focusing mirror module and collimating mirror module and is assembled in place, has improved the accuracy of the position that optical lens module was installed in the base, has avoided artificial assembly error. For example, the contact sensor may be installed at the bottom of the guide groove.

As shown in fig. 3, the first mounting structure further includes a first opening portion and a first cover 36 that is matched with the first opening portion, and the first opening portion is disposed on the base 1 and is located above the mounting positions of the focusing lens module 32 and the protecting lens module 31. The first cover 36 is opened, the movable mounting member 35 and the guide fixing portion are exposed in the first opening portion, and the movable mounting member 35 can be taken out from the base 1 through the first opening portion or reinstalled in the base 1, so that the installation, replacement and maintenance of the optical lens are facilitated.

The movable mounting member 35 may be fixedly connected to the first cover 36 so that the first cover 36 may be removed together with the movable mounting member 35 while being opened, the first cover 36 is further provided with a loosening prevention bolt 361, the loosening prevention bolt 361 may fixedly connect the first cover 36 to the base 1 to seal the first opening, and when the loosening prevention bolt 361 is loosened, the loosening prevention bolt 361 may not be loosened from the first cover 36, and at this time, the loosening prevention bolt 361 may serve as a handle to take out the first cover 36 from the first opening by holding the loosening prevention bolt 361.

In addition, as shown in fig. 5, the movable mounting member 35 is provided with a cooling passage 351, the cooling passage 351 is disposed around the outer periphery of the optical lens, and both ends of the cooling passage 351 are respectively provided with a butt hole 352, and the butt holes 352 are used for being communicated with a cooling air passage so that the cooling air of the cooling air passage flows through the cooling passage 351 to cool the optical lens.

Specifically, the cooling channel 351 may be disposed at a position of the box body near the extension, and the cooling channel 351 may have a U-shape, a rectangular shape, or a semicircular shape, which can surround the outer periphery of the optical lens. The butt-joint holes 352 penetrate through the cooling channel 351 from the end face of the box body, and the two butt-joint holes 352 at the two ends of the cooling channel 351 penetrate through the cooling channel 351 from the two opposite end faces of the box body respectively, so that cooling gas can flow in from one end of the cooling channel 351 and flow out from the other end of the cooling channel 351, the effect of flowing around the optical lens is achieved by the cooling gas, the optical lens can be sufficiently cooled, and the cooling efficiency of the cooling gas circuit is improved.

As shown in fig. 3, the mirror module 33 is detachably mounted in the cavity of the accommodating section 13 of the base 1 through a second mounting structure, the second mounting structure comprises a first mounting cavity 37 arranged in the accommodating section 13, the first mounting cavity 37 comprises a mirror accommodating part and a mirror motor accommodating part, the mirror accommodating part is communicated with the light-passing channel, the shape of the mirror motor accommodating part is matched with the contour of the mirror motor of the mirror module, and the mirror module is movably sleeved and matched with the mirror motor accommodating part through the mirror motor 33 to realize positioning mounting and detachable connection with the base 1.

The second mounting structure further includes a second opening 371 and a second cover 38 mated with the second opening 371. The second opening 371 is disposed on the base 1 and above the first mounting cavity 37, the second cover 38 is opened, the mirror module 33 is exposed in the second opening 371, and the mirror module 33 can be removed from the base 1 or reinstalled in the base 1 through the second opening 371, so as to facilitate the mounting, replacement and maintenance of the optical lens. The rear end of the galvanometer motor may be fixedly connected to the second cover 38 so that the second cover 38 may be removed along with the mirror module 33 while being opened.

The second cover 38 is further provided with a loosening-preventing bolt, the loosening-preventing bolt can tightly connect the second cover 38 to the base 1 to seal the second opening 371, and when the loosening-preventing bolt is loosened, the loosening-preventing bolt cannot be loosened from the second cover 38, at this time, the loosening-preventing bolt can act as a handle, and the second cover 38 is taken out from the second opening 371 by holding the loosening-preventing bolt.

As shown in fig. 3, a third mounting structure is provided in the base 1, and the laser output head assembly 4 is detachably mounted in the base 1 through the third mounting structure, and the third mounting structure includes a second mounting cavity 39 and a fixed cover plate 391 disposed in the second mounting cavity 39. The second installation cavity 39 is internally provided with an installation groove with a shape matched with the outline of the laser output head assembly 4, the side wall of the fixed cover plate 391 is provided with a fixed groove 392 matched with the outline of the laser output head assembly 4, the fixed cover plate 391 is fixedly connected with the base 1, and the laser output head assembly 4 is fixed in the cavity formed by the installation groove and the fixed groove in a sealing way.

The third mounting structure further includes a third opening 393 and a third cover 394 cooperating with the third opening 393, the third opening 393 being located above the second mounting cavity 39. After the third cover 394 is opened, the fixed cover 391 is exposed in the third opening 393, and the fixed cover 391 and the laser output head assembly 4 can be taken out from the base 1 through the third opening 393 or reinstalled in the base 1, so as to facilitate the installation and maintenance of the laser output head assembly 4.

The laser output head assembly 4 comprises a quartz end cap and an energy-transmitting optical fiber, one end of the energy-transmitting optical fiber is connected with the quartz end cap, and the other end of the energy-transmitting optical fiber extends out from the rear end of the base 1 and is connected with the laser 100. The quartz end cap and the energy-transmitting optical fiber are correspondingly arranged in the mounting groove, and the shape of the mounting groove is matched with the outline shapes of the quartz end cap and the energy-transmitting optical fiber, so that the mounting groove can position and fix the quartz end cap and the energy-transmitting optical fiber, and then the mounting groove is covered by the fixed cover plate 391, so that the laser output head assembly 4 is fixed in the inner cavity of the base 1 in a sealing way.

Of course, the side wall of the fixed cover plate 391 may also be provided with a fixing groove 392, and the shape of the fixing groove 392 is matched with the outline shape of the quartz end cap and the energy-transmitting optical fiber, so that the quartz end cap and the energy-transmitting optical fiber can be positioned and fixed. And then the laser output head assembly 4 is tightly fixed in a cavity formed by the mounting groove and the fixing groove 392 through the fastening connection of the fixing cover plate 391 and the base 1, so that a better sealing and fixing effect can be obtained, and the laser output head assembly 4 and the base 1 are integrally and integrally mounted.

Because the base is an holistic structure, optical lens subassembly and laser output head subassembly all integrated mounting in the base, make laser welder realize with laser output head subassembly degree of depth integration, realized the integrated design of integration, make laser welder and laser output head subassembly no longer be two independent components of assembling when using, the benefit of design like this is:

firstly, because the laser output head assembly is integrally installed in the base in advance, the laser output head assembly is equivalent to a component part of the laser welding gun, the laser output head assembly and the component part are integrated, and the assembly and the output precision of the laser output head assembly are finished through one-time debugging in factory assembly, and when the laser output head assembly is used, the laser is directly connected with the laser through the energy transmission optical fiber, and the laser output head assembly can be used after being started. Compared with the traditional laser welding gun and the laser output head assembly which are independent components, the laser output head assembly and the laser welding gun do not need to be connected in a plugging and plugging manner or in a flange manner before being used each time, and the debugging time and the connecting procedure consumed by the connection of the laser through the laser output head assembly and the laser welding gun are saved.

Secondly, the base is an integrated design part, so that the problems of tightness, dust prevention and leakage prevention in the base can be well solved, optical devices in the base are effectively protected, and the service life of the laser welding gun is prolonged.

Thirdly, the base is an integrated design part, so that the design difficulty of a laser welding gun can be reduced, the processing technology of the base is simplified, the processing precision of the base can be ensured, and the processing cost is reduced.

Fourth, make whole laser welder structure compacter, light and handy, easy equipment and debugging have saved purchase maintenance cost, portable, transportation and removal more.

In the working process of the laser welding gun, on one hand, the generated heat is accumulated to easily damage the optical lens due to long-time output of the laser, on the other hand, the dust, splashes and other particulate matters generated in the welding process also easily enter from the inner channel of the spray pipe assembly 2 and contact with the optical lens, and the phenomenon that the optical lens is burnt and damaged can also occur.

Therefore, two gas paths are necessary to perform gas path cooling and gas path protection for the optical lens, and for this purpose, the gas delivery gas path system 5 is provided with a cooling gas path 51 and a protection gas path 52.

In the drawings of the embodiments of the present invention, the direction indicated by the illustrated arrows is the direction in which the gas flows in each gas path.

The cooling air path comprises a first air inlet section, an integral cooling part, an optical lens cooling part and a first output section.

Specifically, the first air inlet section is used for being connected with an external air source pipeline so as to enable air to be connected into the cooling air path. The first section of admitting air can be the trachea, and tracheal rear end is connected with the valve body of outside air supply, and the rear end of first cooling section is equipped with first air inlet, has seted up first through-hole on the lateral wall of base rear end, and this first through-hole runs through the lateral wall and the whole cooling part intercommunication of shell body, and first section of admitting air is connected with first through-hole through sealed adapter to realize the purpose that first section of admitting air is connected with first air inlet.

In the embodiment of the present invention, as shown in fig. 3 and 4, the base 1 includes an outer shell 101 and an inner shell 102, the outer shell 101 integrally covers the inner shell 102, and an inner space of the inner shell 101 forms an inner cavity of the base 1. A gap is provided between the outer case 101 and the inner case 102, so that a sandwich space 103 is formed between the outer case 101 and the inner case 102, and the sandwich space 103 entirely covers the outer periphery of the inner case 102. The interlayer space 103 forms an integral cooling portion of the cooling air path, and the cooling air of the cooling air path fills the entire interlayer space 103 so that the cooling air is entirely coated on the outer surface of the inner housing 102. The base 1 can be integrally manufactured from a complete blank by a shell drawing process.

Because a gap is arranged between the outer shell 101 and the inner shell 102, a layer of interlayer space 103 is formed between the outer shell 101 and the inner shell 102, the interlayer space 103 integrally covers the outer surface of the inner shell 102, and the interlayer space 103 is an integral cooling part. The cooling gas fed from the first air intake section into the interlayer space 103 fills the entire interlayer space 103 so that the cooling gas is entirely coated on the outer surface of the inner case 102.

The heat emitted by the optical module (including the laser output head assembly, the collimating lens module, the reflecting lens module, the focusing lens module and the protecting lens module) arranged in the inner shell 102 is transferred to the inner shell 102 in a heat conduction mode, so that the heat is taken away by cooling gas coated on the outer surface of the inner shell 102, and the purpose of integral cooling is realized. Because the cooling gas integrally coats the outer surface of the inner shell 102, the cooling gas can be fully contacted with the outer surface of the inner shell 102, and the cooling effect and the cooling efficiency of the integral cooling part are improved.

As shown in fig. 4, since the optical lenses of the protection lens module 31, the focusing lens module 32 and the collimating lens module are all mounted in the base 1 by the movable mounting member 35, the movable mounting member 35 is provided with cooling channels 351 provided around the outer periphery of the optical lens, the cooling channels 351 form an optical lens cooling portion, and both ends of the cooling channels 351 are respectively provided with a butt hole 352.

In the assembled state, the movable mount 35 blocks the interlayer space 103 of the integral cooling portion, leaving only the docking hole 352 in communication with the interlayer space 103. When the cooling gas in the integral cooling portion flows through the movable mounting member 35, it flows into the cooling passage 351 through the abutting hole 352 and then flows back into the integral cooling portion from the other abutting hole 352, so that the cooling gas bypasses the periphery of the optical lens along the cooling passage 351, and the heat transferred to the movable mounting member 35 by the optical lens is taken away, so that the optical lens is cooled again, and the purpose of sufficiently cooling the optical lens is achieved.

As shown in fig. 3 and 6, the first output section is disposed in front of the protection mirror module 31, the first output section is provided with an air wall generator 60, the air wall generator 60 includes a plurality of air outlet channels 61 arranged at intervals on the periphery of the light-passing channel, the plurality of air outlet channels 61 of each air wall generator 60 are all disposed to incline from the periphery to the axis of the light-passing channel and are communicated with the light-passing channel, the inclination angles of the air outlet channels 61 of the same air wall generator 60 are the same, and the inclination angles are defined as included angles between the extension lines of the axes of the air outlet channels 61 and the axes of the light-passing channel.

When the cooling gas passes through the first output section, the cooling gas flows into the inner channel of the spray pipe assembly 2 in a split manner through the plurality of gas outlet channels 61 of the gas wall generator 60, and as each gas outlet channel 61 of the same gas wall generator 60 is obliquely arranged and has the same inclination angle, the gas flows flowing out of each gas outlet channel 61 can be converged and intersected at the same focus at the same inclination angle, and an annular gas wall 10 is formed in front of the focus, and the gas wall 10 can prevent particles such as smoke dust and splashes entering from the inner channel of the spray pipe assembly 2 from entering the inner cavity of the base 1, so that a good protection effect is achieved on the protection mirror of the protection mirror module 31.

One or more gas wall generators can be arranged according to actual conditions, each gas wall generator correspondingly generates one gas wall, and the one or more gas walls are generated by adjusting the inclination angles of the gas outlet channels of different gas wall generators. When the first output section is provided with a plurality of gas wall generators, the plurality of gas wall generators are arranged in order of the gas wall generators surrounded by the epitaxial gas wall generators.

The plurality of gas wall generators can generate the same gas wall or can correspondingly generate a plurality of gas walls, when the plurality of gas wall generators generate the same gas wall, the cooling gas flowing out of the gas outlet channels of the plurality of gas wall generators is converged and intersected at the same focus, so that the inclination angles of the gas outlet channels of the plurality of gas wall generators are gradually decreased from outside to inside, and the extension lines of the axes of the gas outlet channels of the plurality of gas wall generators are intersected at the same point. When a plurality of gas wall generators correspondingly generate a plurality of gas walls, it means that the cooling gases flowing from the gas outlet channels of different gas wall generators converge and intersect at different focal points. Therefore, the inclination angles of the air outlet channels of the air wall generators are equal or gradually increase from outside to inside, and the closer to the air wall generator of the axis of the light transmission channel, the closer to the focal point of the extension line of the axis of the air outlet channel is to the first output section.

For example, as shown in fig. 7 or 8, the first output section is provided with two gas wall generators, named as a first gas wall generator 601 and a second gas wall generator 602, respectively, and the first gas wall generator 601 is wrapped around the second gas wall generator 602. At this time, if it is desired to generate the same gas wall by the two gas wall generators, the inclination angle of the gas outlet channel of the second gas wall generator 602 is smaller than the inclination angle of the gas outlet channel of the first gas wall generator 601, so that after the inclination angles of the gas outlet channels of the first gas wall generator and the second gas wall generator are calculated, it is possible to realize that the extension lines of the gas outlet channel axes of the first gas wall generator 601 and the second gas wall generator 602 intersect at the same focal point, so that the gas flows flowing out of the gas outlet channels of the first gas wall generator 601 and the second gas wall generator 602 converge and intersect at the same focal point, and form a gas wall in front of the focal point.

Accordingly, if it is desired to achieve two gas wall generators producing two different gas walls, the angle of inclination of the gas outlet channels of the second gas wall generator 602 is equal to or greater than the angle of inclination of the gas outlet channels of the first gas wall generator 601. After calculating the inclination angles of the gas outlet channels of the first gas wall generator 601 and the second gas wall generator 602, it is possible to achieve that the axis extension lines of the gas outlet channels of the first gas wall generator 601 and the second gas wall generator 602 intersect at different focuses, and the focuses of the axis extension lines of the gas outlet channels of the second gas wall generator 602 are closer to the first output section than the focuses of the axis extension lines of the gas outlet channels of the first gas wall generator 601, so that the gas flows flowing out of the gas outlet channels of the first gas wall generator 601 and the second gas wall generator 602 converge and intersect at two different focuses, and respectively form a gas wall in front of the two focuses.

The principle of generating different numbers of gas walls by other numbers of gas wall generators is the same as that of the embodiment of generating gas walls by two gas wall generators, and is not repeated here.

Specifically, as shown in fig. 3 and 6, an air wall ring 6 is disposed in front of the protection mirror module 31, the air wall ring 6 is mounted in the base 1 in a sealing manner, and the air wall ring 6 includes a body 62, a light passing hole 63, an air storage portion 64, and a plurality of air outlet channels 61 arranged at intervals around the axis of the light passing hole 63. The plurality of the air outlet channels 61 are each arranged to be inclined from the periphery to the axis of the light passing hole 63 and communicate with the light passing hole 63, and the inclination angles of the plurality of air outlet channels 61 are the same. The extension lines of the axes of the plurality of gas outlet channels 61 intersect at the same point, and when the cooling gas of the cooling gas channel flows out into the light passing holes 63 through the gas outlet channels 61, a gas wall 10 is formed in the light passing channels. The inclination angles of the plurality of gas outlet channels 61 are in the range of 20 ° -80 °, for example, the inclination angles of the plurality of gas outlet channels 61 are 30 °, 45 ° or 60 °, and the gas wall formed by the inclination angles set by the values is complete, the gas flow is stable, and the turbulence is less.

The light through hole 63, the gas storage portion 64 and the gas outlet channel 61 are all arranged on the body 62, the light through hole 63 is communicated with the light through channel of the base 1 and the internal channel of the gun barrel assembly 2, the gas wall ring 6 is arranged in the base 1 in a sealing mode, the light through hole 63 can be considered to form a part of the light through channel, the gas storage portion 64 is an annular groove formed in the side wall of the body 62 of the gas wall ring 6, the annular groove is connected with the inner wall of the base in a sealing mode to form a gas storage chamber, and the gas outlet channel 61 of the gas wall generator 60 is communicated with the gas storage chamber and the light through hole 63.

Or the air wall ring is not provided with an annular groove, at the moment, the air wall ring is of a tubular structure, the outer diameter of the air wall ring is smaller than the inner diameter of the inner shell of the base, the front end face of the air wall ring, the inner wall of the inner shell and the rear end face of the gun tube seat protecting mirror module are sealed to form an air storage chamber, and an air outlet channel of the air wall generator is used for communicating the air storage chamber with the light through hole.

The first output section includes a second air inlet 1021, an air storage chamber and a gas wall generator 60, the second air inlet 1021 is communicated with the interlayer space 103 of the integral cooling portion so as to introduce the cooling air in the integral cooling portion into the air storage chamber, and the cooling air flows out into the light through holes 63 through the air outlet channels 61 of the gas wall generator 60 so as to form a gas wall in the internal channel.

One or more gas wall generators may be provided on the gas wall ring 6 to create one or more gas walls within the interior channel, and the gas outlet channels of the gas wall generators may be inclined holes provided in the bottom wall of the annular groove or in the end wall of the front end of the annular groove. Alternatively, when the gas wall ring is not provided with an annular groove, the gas outlet channel of the gas wall generator may be an inclined hole provided in the sidewall of the gas wall ring. The arrangement mode of the inclined holes of the two air wall rings is the same as that of the air outlet channels of the air wall generator described in the above embodiment, and will not be described herein.

In addition, the installation position of each optical module is also provided with a temperature sensor, the temperature sensor is used for monitoring the working temperature of the optical module in real time, and when the temperature is abnormal, abnormal information is fed back in time and used as an abnormal alarm signal to remind an operator to stop using.

As shown in fig. 3 and 6, the protection gas circuit 52 includes a second gas inlet section, a conveying section 521, and an input section, where the second gas inlet section is located at the front end of the protection gas circuit, and the input section is located at the tail end of the protection gas circuit, and the second gas inlet section is connected to an external gas source pipeline so as to access the gas into the protection gas circuit. The second air inlet section can be an air pipe, the rear end of the air pipe is connected with a valve body of an external air source, the second air inlet section and the first air inlet section can share the same external air source, and the external air source is respectively connected with the first air inlet section and the second air inlet section through three-way valves. The rear end of the conveying section is provided with a third air inlet, the front end of the second air inlet section is connected with the third air inlet, the third air inlet can be a second through hole formed in the side wall of the rear end of the outer shell 101 of the base 1, the second through hole penetrates through the side wall of the outer shell 101 to be communicated with the conveying section 521, and the second air inlet section is connected with the second through hole through a sealing adapter so as to achieve the purpose that the second air inlet section is connected with the conveying section.

The conveying section 521 may be a gas conveying passage formed on the side wall of the outer casing 101 from back to front along the axis, or may be a section of pipeline disposed outside the side wall of the outer casing 101. The gas transmission channel is arranged on the side wall of the outer shell 101, so that the structure of the protection gas channel can be simplified, the gas tightness is good, and the appearance of the laser welding gun is attractive.

One end of the inlet section is connected to the delivery section 521 and the other end is in communication with the internal passage 24 of the spout assembly 2, and the inlet section may introduce the shielding gas of the delivery section into the internal passage 24 of the spout assembly 2.

Specifically, the nozzle assembly 2 includes a nozzle 23, a barrel 22 and a barrel holder 21 coaxially connected in sequence, and the nozzle 23, the barrel 22 and the barrel holder 21 are all arranged in a hollow structure along an axis, and the hollow parts of the nozzle 23, the barrel 22 and the barrel holder 21 are communicated to form an internal passage 24 penetrating through the entire nozzle assembly 2. The internal channel 24 can pass through the gas output by the gas conveying gas circuit system and is sprayed out by the nozzle 23 to act on the welded object, and meanwhile, the internal channel 24 can also pass through the laser beam output by the optical lens assembly and is sprayed out by the nozzle to act on the welded object.

As shown in fig. 6 and 9, at least one air intake duct 25 is provided in the gun holder 21, one end of the air intake duct 25 communicates with the delivery section 521, the other end of the air intake duct 25 communicates with the internal passage 24, and the input section includes the air intake duct 25.

In order to effectively prevent particles such as smoke dust and splashes outside the welding gun from entering the inner cavity of the base 1 along the inner channel and polluting the optical lens, so that the lens is burnt out, the air inlet channel 25 is obliquely arranged from the outer end of the gun tube seat 21 to the axis. When the shielding gas supplied from the delivery section 521 enters the internal passage 24 through the inclined intake passage 25, the flow direction is changed by the intake passage 25, so that the gas flow flows in a spiral shape toward the nozzle 23 after entering the internal passage 24.

Because the protective gas flows in the internal channel 24 in a spiral shape, the flow resistance caused by the inner wall in the internal channel 24 is small, so that the gas flow can obtain a relatively uniform flow speed no matter at the edge or the center of the internal channel 24, and the gas flow is ensured to flow to the nozzle 23 in an integral constant speed, thereby increasing the resistance of particles such as smoke dust, splashes and the like moving along the internal channel 24 to the direction of the optical lens assembly, effectively preventing the particles such as the smoke dust, the splashes and the like from contacting with the lens of the optical lens assembly, and achieving the purpose of preventing the optical lens from being polluted and causing the lens to be burnt. In addition, the protective gas flowing through the nozzle 23 can prevent the high temperature at the nozzle 23 from continuously transmitting to the rear end of the spray pipe assembly 2, and can cool the spray pipe assembly 2.

The inclined form of the air inlet 25 may be a plane inclination or a three-dimensional space inclination. When the air inlet 25 is inclined in a plane, the axis of the air inlet 25 is coplanar with the axis of the internal channel 24, and after the cooling air flows into the internal channel 24 through the air inlet 25, the cooling air is impacted with the inner wall of the internal channel 24 for many times to agitate the air flow of the internal channel 24, so that the air flow gradually forms a spiral shape forward in the internal channel 24.

As shown in fig. 11, when the air intake duct 25 is inclined in three-dimensional space, an XYZ three-dimensional space coordinate system is established with the center of the hollow portion of the gun holder 21 as a base point, in which the X axis coincides with the axis of the gun holder 21, so that the inclination angle of the air intake duct 25 can be more intuitively expressed. Specifically, the axis extension line of the air inlet 25 is provided with an included angle with the XY plane, the YZ plane and the XZ plane, and the included angle is an acute angle, so that it can be ensured that the shielding gas flowing into the internal channel 24 from the air inlet 25 obtains an initial direction inclined in the XYZ three-dimensional space coordinate system, and when the shielding gas enters the internal channel 24 from the air inlet 25, a component speed is provided in the tangential direction of the internal channel. The partial velocity is beneficial to the gas flow forming a spiral shape in the internal channel 24, so that the shielding gas can obtain the gas flow in the spiral shape after entering the internal channel 24, and the purpose of forming the spiral shape flow of the shielding gas in the internal channel 24 is achieved.

When the intake duct 25 is provided in plural, the plural intake ducts 25 are provided at intervals along the outer periphery of the gun barrel holder 21. Each of the intake passages 25 may be set to the same inclined posture, ensuring that the inclination angle of each of the intake passages 25 is the same, so that the gas flowing from each of the intake passages 25 into the internal passage 24 obtains the same initial direction. The advantage of this arrangement is that it is possible to ensure that the shielding gas flowing into the internal passage 24 from each inlet passage 24 forms a flow of the same spiral form, and since the spiral forms of each flow are the same, the steps are in agreement, no interference is generated between each other, and it is ensured that the flowing spiral flow in the internal passage 24 is more stable and uniform, and no disturbance of the flow is caused, thereby a more effective blocking effect on particles such as smoke dust, splashes, etc. can be obtained.

When the inlet is inclined in a plane, the angle between the inlet axis and the internal channel axis may be selected in the range of 20 ° to 80 °. For example, the included angle between the axis of the air inlet and the axis of the internal passage may be set to 30 °, 45 ° or 60 °, and the protection gas flowing into the internal passage in the initial direction may be set to those angles, so that a better spiral airflow may be obtained.

As shown in fig. 11, when the air inlet 25 is inclined spatially, in the XYZ spatial coordinate system, the angle between the air inlet 25 and the XY plane, the angle between the air inlet 25 and the XZ plane, and the angle between the air inlet 25 and the YZ plane are equal, and the angles between the air inlet 25 and the three planes may be selected in the range of 20 ° to 80 °. For example, the angle between the air inlet 25 and the XY plane, the angle between the air inlet 25 and the XZ plane, the angle between the air inlet and the YZ plane, and the angle between the air inlet and the YZ plane may be set to 30 °, 45 ° or 60 °, and the air flowing into the internal passage 24 may be set to these angles as initial directions, so that a preferable spiral airflow may be obtained.

Of course, the air inlet on the gun tube seat 21 can also be arranged in a spiral shape around the axis of the internal channel, so that the shielding gas can obtain a pre-spiral shape in the air inlet, and after the shielding gas flows into the internal channel from the air inlet, the gas retains the initial shape of the pre-spiral shape in the air inlet, so that the shielding gas can more easily obtain the airflow in the spiral shape in the internal channel, and the purpose of forming the spiral shape flow of the shielding gas in the internal channel is achieved.

Or the air inlet on the gun tube seat can be also arranged in an arc shape (such as an arc or an elliptical arc), and the tangential direction of the internal channel has a partial velocity when the shielding gas enters the internal channel from the air inlet, and the partial velocity is favorable for the airflow to form a spiral shape in the internal channel, so that the shielding gas can obtain the airflow in the spiral shape after entering the internal channel, and the purpose that the shielding gas flows in the spiral shape in the internal channel is achieved.

As shown in fig. 9 and 10, the hollow portion of the barrel holder 21 is provided as a first passage 210, the hollow portion of the barrel 22 is provided as a second passage 220, the hollow portion of the nozzle 23 is provided as a third passage 230, and the first passage 210, the second passage 220, and the third passage 230 are sequentially communicated to form a complete internal passage 24. The shielding gas in the shielding gas path flows into the first passage 210 through the gas inlet 25, the spiral gas flow 20 starts to form in the first passage 210, the spiral gas flow 20 gradually flows through the second passage 220 and the third passage 230, and finally flows out of the third passage 230.

The second passage 20 includes an accelerating cavity 221 and a buffer cavity 222, the accelerating cavity 221 is provided with a large end and a small end, the cross section of the accelerating cavity 221 gradually decreases from the large end to the small end, the cross section of the buffer cavity 222 is larger than the cross section of the small end of the accelerating cavity 221, and the cross section is defined as a cross section perpendicular to the axis of the accelerating cavity 221. The accelerating cavities 221 may be circular, oval, or polygonal in cross-section, such as rectangular, square, trapezoid, etc. The cross-section of the buffer chamber 222 may be circular, oval, or polygonal such as rectangular, square, trapezoid, etc.

For example, as shown in fig. 10, the second passage 220 includes an acceleration chamber 221 having a conical shape and a buffer chamber 222 having a cylindrical shape, a large end of the acceleration chamber 221 is communicated with the first passage 210, a small end of the acceleration chamber 221 is communicated with a rear end of the buffer chamber 222, a diameter of the buffer chamber 222 is larger than a diameter of the small end of the acceleration chamber 221, a front end of the buffer chamber 222 is communicated with the third passage 230, and a diameter of the buffer chamber 222 is larger than a diameter of the third passage 230.

When the spiral airflow flows through the second passage 220, the spiral airflow flows from the large end of the accelerating cavity 221 to the small end, and the accelerating cavity 221 is conical, so that the spiral airflow is continuously accelerated in the process of flowing to the small end, the speed is faster and faster, and the aim of acceleration is to effectively prevent particles such as smoke dust, splashes and the like from entering the accelerating cavity 221. The accelerated spiral air flow finally flows into the buffer chamber 222 from the small end of the acceleration chamber 221, and since the diameter of the buffer chamber 222 is larger than that of the small end of the acceleration chamber 221, when the spiral air flow enters the buffer chamber 222, the flow speed is suddenly reduced, and the flow form is changed, so that the form of the spiral air flow disappears in the buffer chamber 222, and the air flow gradually forms a straight flow form when flowing forwards in the buffer chamber 222. The air flow then flows forward into the third passage 230, and as the diameter of the third passage 230 is smaller than that of the buffer chamber 222, the air flow is accelerated again when flowing through the third passage 230, the linear flow of the air flow is further stabilized, and the air flow in the linear form finally flows out of the nozzle 23 from the front end of the third passage 230 and acts on the surface of the workpiece to be welded.

The gas flow rate of the internal channel 24 is 15-20L/min, and when the gas flow rate is lower than the flow rate range, the gas flow rate in the internal channel 24 cannot meet the requirement, particles such as smoke dust and splashes cannot be better blocked, and particles such as smoke dust and splashes generated on the surface of a workpiece during welding cannot be quickly blown off, and when the gas flow rate is higher than the flow rate range, the cost of a gas source is increased.

The length of the buffer cavity 222 is 1.2-1.5 times of the diameter of the buffer cavity, so that a better air flow buffer effect can be achieved, the speed of air flow in the buffer cavity 222 can be reduced in a required ideal range, a better effect of blocking particles such as smoke dust and splashes can be obtained, and meanwhile, the spiral air flow shape can be completely changed in the buffer cavity 222.

The taper of the accelerating cavity 221 is 3-5 degrees, and the length of the accelerating cavity 221 is 2.5-3 times of the length of the buffer cavity 222, so that a better accelerating effect can be obtained in a limited volume space structure, the air flow reaches a better speed range after being accelerated by the accelerating cavity 221, the air flow can obtain better blocking effect on dust, splashes and other particles, and a better initial speed range is obtained after the air flow is decelerated by the buffer cavity 222, so that the dust, splashes and other particles generated on the surface of a workpiece during welding can be quickly blown off after the air flow is accelerated again by the third passage 230 and sprayed out from the nozzle 23.

In summary, the air flow flowing into the internal channel 24 of the nozzle assembly 2 from the protection air path forms a spiral air flow 20 in the first channel 210 under the action of the inclined air inlet channel 25, the spiral air flow 20 enters the second channel 220, is accelerated by the accelerating cavity 221, enters the buffer cavity 222, and decreases in speed of the spiral air flow in the buffer cavity 222, the flow form is changed, gradually forms a straight form, then accelerates again when flowing through the third channel 230, forms a stable straight form flowing air flow, and finally flows out of the nozzle from the front end of the third channel 230 to act on the surface of the workpiece to be welded.

After the airflow is accelerated through the third passage 230, the airflow speed is maximized when the airflow is ejected from the nozzle 23, and the airflow speed is maximized, so that the airflow can quickly blow away the dust, splashes and other particles generated during welding, and most of the dust, splashes and other particles are blocked outside the nozzle and cannot enter the third passage 230, thereby forming a first protection. The remaining particles such as smoke and spatter enter the second passage 220, the speed of the particles such as smoke and spatter is synchronously reduced along with the airflow under the action of the buffer cavity 222, and the airflow speed at the small end of the acceleration cavity 221 is suddenly increased at the rear end of the buffer cavity 222, so that the remaining particles such as smoke and spatter are blocked in the buffer cavity 222, and a second path of protection is formed. Moreover, the spiral air flow in the first passage 210 and the accelerating cavity 221 can also effectively invade the rear end of the first passage 210 by particles such as smoke dust and splashes, so as to form a third protection, and the optical lenses of the optical lens assembly are protected layer by layer under the combined action of the three protection, so that the phenomenon that the optical lenses are polluted is effectively avoided, and the service life of the optical lenses is prolonged.

Although the spiral air flow can block particles such as smoke dust and splashes from invading in the internal channel, if the air flow is sprayed out from the nozzle in a spiral form and acts on the surface of a welded workpiece, the air flow acting on the surface of the welded workpiece cannot completely cover or uniformly cover the processing area of the laser spot due to the morphological characteristics of the air flow in the spiral form, so that the contact of air and the welding surface of the welded workpiece cannot be blocked to a great extent, and the welding surface material is oxidized. Therefore, the spiral airflow must be changed to form a uniform straight airflow, and then ejected from the nozzle, so that the airflow acts on the surface of the workpiece to be welded, and the processing area of the laser spot can be completely covered.

Therefore, it is necessary to provide the buffer chamber 222 in the front stage of the second passage 220, because the spiral airflow entering the buffer chamber 222 changes its flow form from the spiral form to the linear form by the action of the buffer chamber 222. The air flow is accelerated again when flowing through the third passage 230, so as to form an air flow flowing in a stable straight line form, the air flow is ejected from the nozzle 23 in a straight line form and acts on the surface of the welded workpiece, the straight line form air flow can completely and uniformly cover the processing area of the laser light spots, oxygen in the air is effectively prevented from contacting the welding surface of the welded workpiece, and phenomena such as oxidation blackening of the surface of the material caused by welding can be effectively avoided.

Or the air inlet on the gun tube seat is set to be in a straight-through type, namely, the air inlet is set to be in a straight line along the radial direction of the gun tube seat, at the moment, when the protective gas input from the third conveying section flows into the inner channel through the air inlet, the air flow in a spiral shape can not be generated in the inner channel, but flows forwards in a straight line shape, so that the air flow is sprayed out from the nozzle in a straight line shape and acts on the surface of a welded workpiece, the straight line shape air flow can completely and uniformly cover the processing area of a laser spot, oxygen in the air is effectively prevented from contacting the welding surface of the welded workpiece, and phenomena such as oxidation blackening and the like on the surface of a material caused by welding can be effectively avoided.

As shown in fig. 10, preferably, the nozzle 23, the gun barrel 22 and the gun barrel seat 21 of the nozzle assembly 2 are separately connected, so that the nozzle 23, the gun barrel 22 and the gun barrel seat 21 can be replaced and maintained independently, and the nozzle, the gun barrel 22 and the gun barrel seat 21 can be integrally arranged. The barrel holder 21 includes a holder 211 and a connecting tube 212, the first passage 210 axially penetrates the holder 211 and the connecting tube 212, and the air inlet 25 is disposed on the holder 21 and is communicated with the first passage 210. The air inlet 25 may be communicated with the first passage 210 from the end surface of the seat 21, so as to be connected with the protection air path, and simplify the layout structure of the protection air path. The intake duct may communicate with the first passage 210 through a side wall of the seat 21. When the number of the air inlets 25 is plural, the air inlets 25 are disposed around the periphery of the first passage 210, and the base 21 is further provided with a flange 26 for connecting with the base 1. The barrel 22 and the nozzle 23 are tubular structures, and the respective tubular structures of the barrel 22 and the nozzle 23 form a second passage 220 and a third passage 230, respectively. The gun tube 22 is connected with the connecting tube 212 through a tube thread, the nozzle 23 and the gun tube 22 are connected with each other through the tube thread, and a sealing ring is arranged at the thread joint if necessary, so that the tightness of the connection of the nozzle and the gun tube is improved.

In addition, in some cases, when the width of the welding seam of the welded workpiece is large, the welding wire needs to be added as a material for filling the welding seam to finish welding, and then the wire feeding assembly 10 needs to be additionally arranged on the laser welding gun to realize the purpose of automatically feeding the welding wire, so that the wire feeding accuracy and the welding efficiency are improved.

Specifically, as shown in fig. 12, the wire feeding assembly 10 includes a wire nozzle 101, a butt joint pipe 102 and a wire feeding pipe 103 which are sequentially connected, the butt joint pipe 102 is detachably connected with the nozzle assembly 2 through a fixing and adjusting device 104, and the wire feeding pipe 103 is detachably connected with the rear end of the outer casing through a connecting piece 105, so that two fixing connection positions are formed, and the wire feeding assembly 10 and the laser welding gun are reliably connected into a whole.

The outlet of the wire nozzle 101 is aligned with the outlet of the nozzle 23 of the nozzle assembly 2, so as to realize that the welding wire fed out from the wire nozzle 101 coincides with the center of the laser output by the nozzle 23, so as to ensure that the welding wire is completely positioned in a laser heating area, enable the heating high temperature to sufficiently melt the welding wire, realize filler welding, and improve welding quality.

The fixed adjusting device 104 comprises a fixed seat 1041 and an angle adjusting piece 1042, the fixed seat 1041 is sleeved on the spray pipe assembly 2, the angle adjusting piece 1042 is connected with the butt joint pipe 102 of the wire feeding assembly 10, specifically, the angle adjusting piece 1042 comprises an adjusting seat and a locking shaft, one end of the adjusting seat is rotationally connected with the fixed seat 1041 through the locking shaft, the other end of the adjusting seat is fixedly sleeved with the connected pipe, the pitching angle of the wire feeding assembly can be adjusted by stirring the adjusting seat to rotate around the locking shaft, and when the wire feeding assembly 10 is matched with different spray pipe assemblies 2, the wire outlet of the wire feeding assembly 101 can be aligned with the outlet of the nozzle 23 of the spray pipe assembly 2.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (3)

1. The gas conveying gas circuit system for the laser processing equipment is characterized by comprising a cooling gas circuit and a protection gas circuit, wherein the cooling gas circuit integrally covers the periphery of the part of the laser processing equipment except for a spray pipe assembly, the cooling gas circuit comprises a first gas inlet section, an integral cooling part, an optical lens cooling part and a first output section, the cooling gas circuit comprises an interlayer space integrally covering the periphery of the part of the laser processing equipment except for the spray pipe assembly, and a cooling channel arranged around the periphery of the optical lens of the laser processing equipment, the cooling gas of the cooling gas circuit fills the whole interlayer space, the cooling channel is communicated with the interlayer space, and the interlayer space forms an integral cooling part of the cooling gas circuit; the first output section is provided with an air wall generator, the air wall generator comprises a plurality of air outlet channels which are arranged at intervals on the periphery of a light-passing channel of the laser processing equipment, the air outlet channels are all inclined from the periphery to the axis of the light-passing channel and are communicated with the light-passing channel, and the inclined angles of the air outlet channels of the air wall generator are the same; when the cooling gas passes through the first output section, the cooling gas flows into the internal channel of the spray pipe assembly in a split manner through a plurality of gas outlet channels of the gas wall generator; the protection gas circuit comprises at least one air inlet channel communicated with the internal channel of the spray pipe assembly, and when the protection gas in the protection gas circuit flows into the spray pipe assembly through the air inlet channel, a component speed is obtained in the tangential direction of the internal channel under the action of the air inlet channel, so that the protection gas generates spiral airflow in the spray pipe assembly.

2. The gas delivery circuit system for a laser processing apparatus of claim 1, wherein the cooling channel is U-shaped, rectangular or semi-circular in shape.

3. The gas delivery circuit system for a laser machining apparatus of claim 1, wherein the gas inlet channel is disposed obliquely; or the air inlet channel is spirally arranged around the axis of the internal channel; or the air inlet channel is arranged in an arc shape around the axis of the internal channel.