CN119077122A

CN119077122A - A handheld laser welding device

Info

Publication number: CN119077122A
Application number: CN202411296732.XA
Authority: CN
Inventors: 陈宗连; 邬宏鑫; 陈宗和
Original assignee: Shenzhen Lanlian Technology Co ltd
Current assignee: Shenzhen Lanlian Technology Co ltd
Priority date: 2024-09-18
Filing date: 2024-09-18
Publication date: 2024-12-06
Anticipated expiration: 2044-09-18
Also published as: CN119077122B

Abstract

The invention provides a handheld laser welding device, belongs to the technical field of laser welding, and aims to solve the problems that in the prior art, a welding gun and an interface are integrated, so that interchangeability between the welding gun and different laser hosts is greatly reduced, and the universality and flexibility of equipment are limited. The invention provides a handheld laser welding device which comprises a welding gun head and an output interface which are mutually matched and inserted, wherein the other end of the welding gun head is used for welding, the other end of the output interface is used for being connected with a host through a wire harness, and the butt-joint interface of the welding gun head and the output interface comprises a laser matching group, a cooling matching group, a shielding gas matching group and an electric signal matching group. Through optimizing the connection mode between the handheld welding gun and the laser host, a standardized quick plug connection interface is designed, so that the high reliability of connection is reserved, and the high interchangeability of the welding gun is realized.

Description

Handheld laser welding device

Technical Field

The invention belongs to the technical field of laser welding, and particularly relates to a handheld laser welding device.

Background

In the technical field of laser welding, a handheld welding gun is used as a core operation component, and the flexibility and the reliability of the handheld welding gun directly influence the efficiency and the quality of welding operation. The welding gun is connected with the laser host through a complex circuit, a cooling liquid pipeline and a protective gas conveying pipeline, the interfaces are numerous, and in order to improve the stability and the reliability of connection, in the traditional design, the handheld welding gun and the pipeline are integrally designed. The integrated design brings new challenges while bringing improved connection reliability. Because of the integration of the welding gun and the interface, the interchangeability between the welding gun and different laser hosts is greatly reduced, and the universality and the flexibility of the equipment are limited.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a hand-held laser welding device, which is used for solving the problems that in the prior art, a welding gun and an interface are integrated, so that the interchangeability between the welding gun and different laser hosts is greatly reduced, and the universality and flexibility of equipment are limited.

To achieve the above and other related objects, the present invention provides a hand-held laser welding device, including a welding gun head and an output interface which are mutually matched and inserted, wherein the other end of the welding gun head is used for welding, and the other end of the output interface is used for connecting with a host through a wire harness;

The butt-joint interface of the welding gun head and the output interface comprises a laser matching group, a cooling matching group, a shielding gas matching group and an electric signal matching group.

Optionally, the output interface comprises an optical fiber seat and an optical fiber output pipe, the optical fiber seat is provided with an optical fiber hole, the optical fiber hole axially penetrates through the optical fiber seat, the optical fiber output pipe is arranged in the optical fiber hole, and both ends of the optical fiber output pipe exceed the end face of the optical fiber seat;

The laser matching group comprises:

the laser channel is arranged at one side of the welding gun head;

and an optical fiber output pipe arranged at the output interface;

when the welding gun head and the output interface are inserted, the optical fiber output tube is matched with the laser channel.

Optionally, the cooling matching group comprises a first medium port and a second medium port which are arranged on one side of the welding gun head, and a first cooling hole and a second cooling hole which are arranged on one side of the optical fiber seat;

the first cooling hole axially penetrates through the optical fiber seat;

The optical fiber output tube is provided with a first port at the tail end part of the optical fiber seat and a second port at the matched part of the optical fiber seat, and the first port and the second port are communicated in the optical fiber output tube;

The second cooling hole is a blind hole punched into the tail end from the head end, a third cooling hole is formed in the optical fiber seat, one end of the third cooling hole is communicated with the second cooling hole, and the other end of the third cooling hole is communicated with the second port;

The first medium port and the second medium port are connected to the inside of the welding gun head body and then communicated to form a loop;

When the welding gun head and the output interface are inserted, the first medium port and the second medium port are in butt joint with the first cooling hole and the second cooling hole.

Optionally, an annular expanding section is arranged in the optical fiber hole on the optical fiber seat, one of outlets of the third cooling hole is positioned in the range of the annular expanding section, and a second opening on the optical fiber output pipe is also positioned in the range of the annular expanding section;

And/or, the optical fiber output pipe is provided with an annular reducing section at the part matched with the optical fiber seat, one outlet of the third cooling hole is positioned in the range of the annular reducing section, and a second port on the optical fiber output pipe is also positioned in the range of the annular reducing section.

Optionally, the optical fiber output tube comprises a tail section, a cooling section and an output section which are sequentially connected, wherein the tail section is used for connecting an optical fiber harness and a host, the cooling section is used for cooling the tail end of the optical fiber harness and an optical fiber crystal, and the output section is used for converting laser output by the optical fiber crystal into collimated light;

the first port and the second port are both disposed at the cooling section.

Optionally, the cooling section includes:

an outer tube with the periphery matched with the optical fiber seat;

the cooling inner core is arranged in the outer tube and provided with a gap with the outer tube, the optical fiber passes through the cooling inner core, and the optical fiber crystal is arranged at the end part of the cooling inner core and emits laser;

the cooling inner core and the two ends of the outer tube are in sealing fit, and the first port and the second port are both positioned on the outer tube and the cooling inner core and are provided with gap parts.

Optionally, a circuitous flow channel structure is arranged on the part, which is provided with a gap with the outer tube, of the cooling inner core, the medium enters the gap part from the first port, flows to the other end along the axis of the cooling inner core, flows back reversely, and flows out of the gap part from the second port after circuitous at least once.

Optionally, the flow channel structure comprises a first blocking ring and a second blocking ring which are arranged at two ends of the gap part;

The guide plate extends from the first plugging ring to the second plugging ring, and extends along the circumference before contacting with the second plugging ring, wherein the part is called a reversing section, then extends reversely to the first plugging ring and stops extending before contacting with the first plugging ring;

The height of guide board with outer tube internal diameter matches, guide board is in 180 degrees intervals are provided with two sets of on the cooling inner core, first mouthful intercommunication is on one of them guide board between switching-over section and the first shutoff ring, the second mouth intercommunication is on another guide board between switching-over section and the first shutoff ring.

Optionally, the shielding gas mating group includes:

a shielding gas interface arranged at one side of the welding gun head;

And a protective air hole arranged on the end face of the output interface;

when the welding gun head and the output interface are inserted, the protective gas interface is in butt joint with the protective gas hole;

On the welding gun head, the shielding gas interface enters the welding gun head body, and after exceeding the range of the shielding mirror assembly and the focusing mirror assembly, the shielding gas interface is led into the laser channel through the second communication hole.

Optionally, the electrical signal mating group includes:

an electrical signal interface arranged at one side of the welding gun head;

The contact seat is arranged on the end face of the output interface;

when the welding gun head and the output interface are inserted, the electric signal interface is connected with the contact seat through electric signals;

And a driving circuit board of the tranquilizing motor assembly is arranged on the welding gun head, and a circuit of the electric signal interface is connected with the driving circuit board.

As described above, the handheld laser welding device of the present invention has at least the following advantages:

Through optimizing the connection mode between the handheld welding gun and the laser host, a standardized quick plug connection interface is designed, so that the high reliability of connection is reserved, and the high interchangeability of the welding gun is realized. The technology not only reduces the complexity and maintenance cost of the system, but also improves the universality and flexibility of the equipment, and meets the requirements of different welding scenes.

Drawings

Fig. 1 shows an overall schematic of the present invention.

Fig. 2 is a schematic diagram of an output interface according to the present invention.

Fig. 3 is a schematic diagram showing the output interface of the present invention in a disassembled state.

Fig. 4 is a schematic cross-sectional view of an optical fiber seat of the output interface of the present invention.

FIG. 5 is a schematic drawing showing a cut-away view of an optical fiber output tube of the output interface of the present invention.

FIG. 6 is a schematic drawing showing the disconnection and the cut-away of the fiber optic output tube of the present invention.

Fig. 7 shows a schematic view of a cooling core according to the present invention.

Fig. 8 shows a circumferential development of the cooling core according to the invention in a schematic plan view.

Fig. 9 shows a schematic view of a welding gun head according to the invention.

FIG. 10 is a schematic view of another view of a torch head according to the present invention.

FIG. 11 is a schematic view of a torch head body of the present invention in cross-section.

FIG. 12 is a schematic view of the laser beam path of the welding gun head according to the present invention.

The optical fiber connector comprises an optical fiber seat 1, an optical fiber hole 10, an annular expanding section 101, a first cooling hole 11, a second cooling hole 12, a third cooling hole 13, a protection air hole 14, a contact seat 151, an optical fiber output pipe 2, a first port 20, a second port 21, an annular reducing section 22, an outer pipe 23, a cooling inner core 24, a first blocking ring 241, a second blocking ring 242, a guide plate 243, a reversing section 2431, an optical fiber crystal 26, a first medium port 311, a second medium port 312, a second communication hole 314, a protection air port 315, an electric signal port 316 and a vibrating mirror assembly 32.

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.

Please refer to fig. 1 to 12. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the invention, are included in the spirit and scope of the invention which is otherwise, without departing from the spirit or scope thereof. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.

The following examples are given by way of illustration only. Various embodiments may be combined and are not limited to only what is presented in the following single embodiment.

Referring to fig. 1, the embodiment of the handheld laser welding device provided by the invention comprises a welding gun head and an output interface which are mutually matched and inserted, wherein the other end of the welding gun head is used for welding, the other end of the output interface is connected with a host through a wire harness, and the opposite-inserted interface of the welding gun head and the output interface comprises a laser matching group, a cooling matching group, a shielding gas matching group and an electric signal matching group.

In the prior art, a welding gun and an interface are integrally designed, or a plurality of scattered connecting channels are arranged between the welding gun and the interface, and the welding gun is disconnected or connected one by one when being replaced. In the scheme, a plurality of key functional components such as a laser matching group, a cooling matching group, a shielding gas matching group and an electric signal matching group are integrated in the end face of the welding gun head, which is opposite to the output interface, so that high interface integration is realized. The design not only reduces the scattered layout among components, but also greatly simplifies the whole structure, so that the system is more compact and lighter. In a traditional welding system, a plurality of interfaces are often required to be connected one by one, so that time and labor are consumed, mistakes are easy to occur, and the interfaces are easy to fail and leak in the using process of a welding gun. In the embodiment, the welding gun and the interfaces can be connected by one-time opposite insertion, so that the butt joint time is greatly shortened, and the working efficiency is improved. The method not only simplifies the operation flow, but also reduces the problems of connection errors or leakage and the like possibly caused by too many external interfaces. The standardized design of the interface is not only convenient for compatible use between welding gun heads of different types and output interfaces, but also promotes modularization and serialization development of welding equipment, so that a user can change or upgrade the equipment more flexibly and conveniently, and the maintenance cost is reduced.

Referring to fig. 9-12, one embodiment of a welding gun head is:

The welding gun head comprises a welding section 30 and a gripping section 31 which are connected with each other and are internally provided with a laser channel, the tail end of the welding section 30 is a welding nozzle 301, the tail end of the gripping section 31 is used for being connected with a laser output interface, the gripping section 31 is also a handle in use, the tail end of the laser output interface is connected with a laser welding host, and the laser welding host provides control signals, cooling liquid, laser beams, shielding gas and the like.

The laser welding torch head further includes a galvanometer assembly 32, a focusing mirror assembly 33, and a protective mirror assembly 34.

The vibrating mirror assembly 32 is arranged at the joint of the welding section 30 and the holding section 31 and reflects laser emitted from a laser channel in the holding section 31 through an output interface into the welding section 30, the vibrating mirror assembly 32 and the focusing mirror assembly 33 are arranged at the welding section 30 in a removable mode, the laser emitted into the welding section 30 passes through the focusing mirror assembly 33 and the protecting mirror assembly 34 and then is emitted into the welding nozzle 301, and the laser energy melts the surface of a workpiece or an externally added welding wire, so that welding is realized.

The vibrating mirror assembly 32 comprises a vibrating mirror motor 321 and a vibrating mirror plate 322, wherein the vibrating mirror plate 322 is a reflecting mirror plate, the vibrating mirror motor 321 is fixed on the shell, the vibrating mirror plate 322 is connected with an output shaft of the vibrating mirror motor 321, and initially, the plane of the vibrating mirror plate 322 is perpendicular to an angular bisector of an included angle between the axis of the welding section 30 and the axis of the gripping section 31 so that a laser beam propagates along a laser channel inside the welding gun head.

The focusing lens assembly 33 includes a first drawer 331 and a focusing lens 332 for focusing a laser beam, the type including a plano-convex lens, a compound lens, etc., the first drawer 331 is provided with a through hole, the focusing lens 332 is mounted in the hole, the welding section 30 is provided with a first cavity 304 into which the first drawer 331 is inserted, and the focusing lens 332 is concentric with the laser channel after the first drawer 331 is inserted into the first cavity 304. After the first drawer 331 is inserted into the first cavity 304, the first drawer 331 is fixedly connected with the welding gun head body through a screw, so that the screw convenient for screwing by hand can be used.

The protective mirror assembly 34 comprises a second drawer box 341 and a protective lens 342, wherein a through hole is formed in the second drawer box 341, the protective lens 342 is installed in the hole, a second cavity 305 for inserting the second drawer box 341 is formed in the welding section 30, and the protective lens 342 covers the laser channel after the second drawer box 341 is inserted into the second cavity 305. After the second drawer box 341 provided with the protective mirror is inserted into the second cavity 305 on the welding gun head, the second drawer box can be fixedly connected with the welding gun head body through a screw, and the screw convenient for screwing by a hand can be used.

The welding section 30 of the gun head includes a body and a barrel 302 that cooperate with each other. The body is a port end, the barrel 302 is a shaft end, and the barrel 302 is detachably inserted into the body. The body is provided with a collar structure 303, the barrel 302 may be inserted into or removed from the body when released, and the barrel 302 may be secured in the body when tightened. The gun barrel of the laser welding gun is used as a wearing part mainly because the gun barrel needs to bear high temperature, high pressure and frequent energy impact in the use process, and the factors easily lead to fatigue, deformation and even melting of materials, thereby influencing the welding quality and the service life of the gun barrel. In addition, spatter, impurities, etc. during welding may also cause wear or blockage of the barrel wall, further accelerating its damage. Therefore, the barrel of the laser welding gun can be detached, so that more convenient maintenance and replacement can be realized, and the smooth welding operation can be ensured.

The first medium port 311 and the second medium port 312 of the torch head are led from the tip end of the grip section 31 to the connection portion of the welding section 30 and the grip section 31, and then are connected in a loop by the first communication hole 313. Referring to fig. 11 and 12, a first communication hole 313 is bored from the outside of the torch head housing, and communicates both ends of the first medium port 311 and the second medium port 312. Then, the opening of the first communication hole 313 at the outer end of the housing is blocked to prevent the outflow of the cooling medium, and as a better practical way, the opening of the first communication hole 313 at the housing may be blocked with a plug-like body that encapsulates the temperature sensor, and the temperature of the internal cooling medium may be measured while blocking the outlet. The welding machine host adjusts the temperature and flow of the cooling medium according to the temperature and flow, and maintains the optimal cooling effect.

The shielding gas interface 315 of the welding gun head is led into the connection part between the welding section 30 and the gripping section 31 from the tail end of the gripping section 31, then enters the welding section 30, exceeds the range of the galvanometer assembly 32 and the focusing lens assembly 33, and finally is led into the laser channel through the second communication hole 314, as can be seen in fig. 11. Finally, the laser beams together reach the welding point from the welding nozzle hole of the welding gun head, and the welding point is covered by the welding head to play a role in protection. The second communication hole 314 penetrates from the outside of the housing to the inside of the housing, communicates the shielding gas port 315 with the laser channel in the center of the housing, and finally seals the second communication hole 314 outside the housing to prevent leakage of shielding gas.

The wiring harness of the electrical signal interface 316 of the gun head is electrically connected to the drive plate of the galvanometer assembly 32. The electrical signal interface 316 is provided with a wire harness terminal seat, and the laser output interface at the other end opposite to the welding gun head is provided with a wire harness terminal seat corresponding to the electrical signal interface, and the wire harness terminal seat are matched in an opposite way, so that the welding gun is connected with a welding host. The welding section 30 and the grasping section 31 are connected, a channel in the welding section 30 penetrates through the shell to form a third cavity for installing the vibrating mirror assembly 32, the vibrating mirror assembly 32 comprises a driving control board and an actuator, the actuator, namely, the vibrating mirror motor, is installed in the third cavity, the actuator comprises a vibrating mirror motor 321 and a vibrating mirror 322, the vibrating mirror motor 321 is fixed in the third cavity of the shell, the vibrating mirror 322 is connected to an output shaft of the vibrating mirror motor 321, the vibrating mirror motor 321 controls the installation angle of the vibrating mirror 322, and the whole vibrating mirror assembly is convenient to assemble, disassemble and maintain.

Referring to fig. 2-5, one embodiment of the output interface is:

The optical fiber welding device comprises an optical fiber seat 1 and an optical fiber output tube 2, wherein an optical fiber hole 10, a first cooling hole 11, a second cooling hole 12 and a third cooling hole 13 are formed in the optical fiber seat 1, the axial head end of the optical fiber seat 1 is used for being connected with a welding gun, the tail end of the optical fiber seat 1 is used for being connected with a host through a wire harness, the optical fiber hole 10 and the first cooling hole 11 axially penetrate through the optical fiber seat 1, the optical fiber output tube 2 is arranged in the optical fiber hole 10, two ends of the optical fiber output tube 2 exceed the end face of the optical fiber seat 1, a first port 20 is formed in the tail end part of the optical fiber output tube 2, a second port 21 is formed in the part, matched with the optical fiber seat 1, the first port 20 and the second port 21 are communicated in the optical fiber output tube 2, the second cooling hole 12 is a blind hole which is driven from the head end into the tail end, one end of the third cooling hole 13 is communicated with the second cooling hole 12, and the other end of the third cooling hole is communicated with the second port 21.

In the above embodiment, instead of directly penetrating the optical fiber seat 1 to be connected to the welding gun head, one of the cooling circuits enters the optical fiber output tube 2 from the first port 20 at the tail end of the optical fiber output tube 2, circulates in the optical fiber output tube 2, returns to the matching position of the optical fiber output tube 2 and the optical fiber seat 1, flows into the optical fiber seat 1 from the second port 21, and then provides an outlet (such as the third cooling hole 13 and the second cooling hole 12 in fig. 4) for the welding gun to be connected by the optical fiber seat 1, so as to dissipate heat of the optical fiber output tube 2. The head end of the optical fiber output tube 2 directly injects laser into the air from the optical fiber, a matched laser channel is arranged in a welding gun, the aperture of the laser channel is matched with the optical fiber output tube 2 so as to ensure concentric matching during insertion, the laser beam path is accurate, and the laser can be reflected to a welding position. At the interface where the laser irradiates the air from the optical fiber bundle, namely the head end of the optical fiber output tube 2, a special optical fiber crystal (or called laser crystal) is arranged to convert the laser beam, and the laser crystal can be a finished product in the market, which is not the core of the scheme, and is only important to provide heat dissipation for the laser crystal. However, this conversion process has energy loss, resulting in an increase in the temperature of the fiber crystal and the fiber output tube 2. The cooling medium enters the optical fiber output tube 2 for circulation, so that the temperature of the optical fiber output tube 2 can be effectively controlled, and the reliability and stability of an output interface are ensured.

In the embodiment of the laser welding gun head and the output interface, the interfaces between the laser welding gun head and the output interface integrate a plurality of interfaces which can be used by the laser welding gun, such as protective gas, cooling liquid and the like, and the interfaces can be connected only through opposite insertion, so that no additional pipeline connection is needed from the outside, no secondary connection operation except opposite insertion connection is needed, the connection process is simplified, the interfaces are standardized, and quick matching use can be realized between welding guns and welding machines of different types through the unified standardized interfaces.

The output interface integrates various functional interfaces required by the laser welding gun, such as shielding gas, cooling liquid and the like, and the connection flow is greatly optimized through a simple opposite connection mode, so that convenience and high efficiency are realized. The innovative design not only omits complicated external pipeline layout and installation steps, but also thoroughly eliminates the requirement for additional secondary connection operation, thereby improving the working efficiency and simultaneously reducing the risk of human operation errors.

More remarkably, the unified standardization of the interfaces promotes the seamless compatibility and the rapid matching use between welding guns of different types and welding machines, breaks through the use limitation of the prior equipment caused by the integrated design of the interfaces or the difference of the interfaces, and provides more flexible and various selection spaces for users. The standardized implementation not only simplifies the complexity of equipment maintenance and upgrading, but also promotes the popularization and application of the laser welding technology, promotes the standardized process of the whole industry, and has profound significance for improving the industry efficiency, reducing the cost and enhancing the market competitiveness.

The cooling design is skillfully integrated, and the overall stability of the laser welding interface is obviously improved. Through the efficient heat dissipation mechanism, the cooling design effectively reduces heat accumulation generated by the laser crystal and key components in the operation process, and avoids performance degradation or failure risk caused by overheating. The high-efficiency temperature control prolongs the service life, and ensures the stable output of the laser beam, thereby improving the precision and consistency of welding operation. In addition, the optimization of the cooling design promotes the balance of the internal environment of the system, reduces the mechanical stress caused by temperature change, further consolidates the structural stability of the interface system and provides solid guarantee for high-quality and high-efficiency welding operation.

In one embodiment of the handheld laser welding device, the laser mating set of the welding gun head and the output interface comprises:

the laser channel is arranged at one side of the welding gun head;

and an optical fiber output pipe 2 protruding from the end surface of the output interface;

When the welding gun head and the output interface are inserted, the optical fiber output tube 2 is matched with the laser channel. The optical fiber output tube 2 on the output interface is inserted into a laser channel on the welding gun head, and the laser beam is injected into the laser channel and is emitted from a gun nozzle of the welding gun head for welding after being reflected by the vibrating mirror component on the welding gun head and focused by the focusing mirror component. The size of the optical fiber output tube 2 is matched with that of the laser channel, and the laser beam can be ensured to be positioned in the center of the laser channel by matching the optical fiber output tube 2 with the laser channel, so that the laser propagation direction is accurate, the butt joint accuracy of the matching part is improved, and the use safety of the welding gun is improved.

Meanwhile, due to the fact that the cooling liquid in the optical fiber output tube 2 flows, the inner core and the outer layer of the optical fiber output tube 2 can be cooled, after the optical fiber output tube 2 is inserted into the welding gun head, the periphery of the optical fiber output tube 2 is matched with the aperture of a laser channel on the welding gun head, heat on the welding gun head is absorbed, and the protruding optical fiber output tube 2 further has the effect of reinforcing heat dissipation of the welding gun head on the premise that the accuracy of matching is guaranteed and the accuracy of a laser path is guaranteed.

In one embodiment of the handheld laser welding device, the cooling matching group comprises a first medium port 311 and a second medium port 312 which are arranged on one side of the welding gun head, a first cooling hole 11 and a second cooling hole 12 which are arranged on one side of the optical fiber seat 1, the optical fiber hole 10 and the first cooling hole 11 penetrate through the optical fiber seat 1 along the axial direction, an optical fiber output tube 2 is arranged in the optical fiber hole 10, two ends of the optical fiber output tube 2 exceed the end face of the optical fiber seat 1, a first port 20 is arranged at the tail end part of the optical fiber output tube 2, a second port 21 is arranged at the matching part of the optical fiber output tube 2 and is communicated with the optical fiber seat 1, the first port 20 and the second port 21 are communicated in the optical fiber output tube 2, a blind hole is formed in the optical fiber seat 1, a third cooling hole 13 is formed in the optical fiber seat 1, one end of the third cooling hole 13 is communicated with the second cooling hole 12, the other end of the third cooling hole is communicated with the second port 21, the first medium port 311 and the second medium port 312 are connected with the inner part of the welding gun head body to form a loop, and when the welding gun head and the output interface pair is inserted, the first medium port 311 and the second medium port 11 and the second cooling hole 12 are butted with the second cooling hole 12.

In the above embodiment, referring to fig. 4 and 5, the cooling medium flows through the first port 20 into the optical fiber output tube 2, flows in the optical fiber output tube 2, flows into the third cooling hole 13 on the optical fiber seat 1 from the optical fiber output tube 2 at the second port 21 at the matching position of the optical fiber output tube 2 and the optical fiber seat 1, flows out from the second cooling hole 12 on the optical fiber seat 1, the second cooling hole 12 is butted with the second medium port 312, and the cooling medium enters the inside of the welding gun head. Inside the torch head, the first medium port 311 and the second medium port 312 are led from the tip end of the grip section 31 to the connection portion of the welding section 30 and the grip section 31, and then are connected in a loop by the first communication hole 313. Therefore, the cooling medium entering the second medium port 312 flows out of the first medium port 311 after circulating in the torch head, returns to the output port through the first cooling hole 11, and directly flows back to the welding host after penetrating the optical fiber holder 1.

The cooling liquid efficiently flows through the optical fiber output tube and the inside of the welding gun head, so that the multiple cooling of the laser crystal in the optical fiber output tube, the shell of the laser channel at the periphery of the optical fiber output tube and the welding gun head body is realized, the working temperature, particularly the working temperature of an interface part, is effectively reduced, and the stability and the service life of laser welding are improved. The cooling liquid circulates through the precisely designed flow channel, so that the cooling effect is uniform and sufficient, and meanwhile, the damage of thermal stress to the equipment structure is reduced. Finally, the cooling liquid directly returns to the welding host through the reflux system, so that the recycling of the cooling liquid is realized, the energy is saved, the environment is protected, and the operation efficiency and the reliability of the whole system are improved.

Further, on the optical fiber seat 1, an annular expanding section 101 is arranged in the optical fiber hole 10, one of the outlets of the third cooling hole 13 is positioned in the range of the annular expanding section 101, and the second port 21 on the optical fiber output pipe 2 is also positioned in the range of the annular expanding section 101;

and/or, the optical fiber output tube 2 is provided with an annular reducing section 22 at the part matched with the optical fiber seat 1, one outlet of the third cooling hole 13 is positioned in the range of the annular reducing section 22, and the second port 21 on the optical fiber output tube 2 is also positioned in the range of the annular reducing section 22.

The second port 21 is arranged on the circumference of the optical fiber output tube 2, is a liquid outlet, and the third cooling hole 13 is arranged on the optical fiber seat 1 and is a liquid inlet in the region matched with the optical fiber output tube 2. The annular reducing section 22/the annular expanding section 101 enables the matching area of the optical fiber output tube 2 and the optical fiber seat 1 to form an annular communication area, and when the cooling medium enters the annular reducing section 22/the annular expanding section 101 from the second port 21, the cooling medium can circulate to reach one side of the third cooling hole 13, flows out from the second cooling hole 12 and then flows into one end of the welding gun butted with the output interface. On the optical fiber output tube 2, the third cooling hole 13 and the two sides of the annular area where the second port 21 is located, and the first sealing ring 90 is arranged at the matching interface of the optical fiber seat 1 and the optical fiber output tube 2, so that the cooling medium in the annular reducing section 22/the annular expanding section 101 can be prevented from leaking along the axial direction.

The two sides of the connection between the third cooling hole 13 and the second port 21 are approximately 180 degrees different, which aims to facilitate the design of a flow channel inside the optical fiber output tube 2, make the flow path of the cooling liquid inside the optical fiber output tube 2 longer, and fully cover the surface of the inner core.

Further, the optical fiber output tube 2 includes a tail section, a cooling section and an output section, which are sequentially connected, the tail section is used for connecting an optical fiber harness and a host, the cooling section cools the tail end of the optical fiber harness and the optical fiber crystal 26, the output section converts laser output by the optical fiber crystal 26 into collimated light, a spherical lens, an aspherical lens, a cylindrical lens and the like can be used, reference can be made to a collimating lens in the prior art, the collimating lens is not a core point of the scheme, and the first port 20 and the second port 21 are both arranged in the cooling section. The first port 20 is positioned at the rear part of the optical fiber seat 1 matched with the optical fiber output tube 2, and the second port 21 is positioned at the matched part of the optical fiber seat 1 and the optical fiber output tube 2.

Wherein, the cooling section can refer to fig. 5 and 6, include:

An outer tube 23 having an outer periphery fitted with the optical fiber holder 1;

A cooling core 24 provided in the outer tube 23 and having a gap with the outer tube 23, through which the optical fiber passes through the cooling core 24, and an optical fiber crystal 26 provided at an end of the cooling core 24 and emitting laser light. The fiber crystal 26 is integral with the cooling core 24 and thus conducts heat to each other, and the cooling core 24 may be made of a highly thermally conductive material, such as a metal, for example, copper, for increased heat dissipation efficiency;

The two ends of the cooling core 24 and the outer tube 23 are in sealing fit to prevent leakage of the cooling liquid, and the first port 20 and the second port 21 are both positioned on the outer tube 23 and the cooling core 24 and have gap parts, so that the cooling liquid can flow out from one port after flowing in from the other port, and heat of the cooling core 24 is absorbed in the process.

Further, a portion of the cooling core 24 having a slit with the outer tube 23 is provided with a detour flow path structure, and the medium enters the slit portion from the first port 20, flows along the axis of the cooling core 24 to the other end, and then flows back in the reverse direction, and flows out of the slit portion from the second port 21 after detour at least once.

The principle of the above embodiment is as follows, referring to fig. 3 and 4, the first port 20 is located at the tail end of the optical fiber output tube 2, the cooling liquid enters the gap between the cooling inner core 24 and the outer tube 23 from the first port 20, flows in the circuitous runner structure in the gap, absorbs the heat generated by cooling the optical fiber crystal 26 in the inner core 24, then reaches the second port 21 and flows out, and the second port 21 is located at the annular reducing section 22/annular expanding section 101 of the optical fiber output tube 2 matched with the optical fiber seat 1, so that the cooling liquid can circumferentially flow at the position, then reaches the third cooling hole 13 on the optical fiber seat 1, flows to the second cooling hole 12 through the third cooling hole 13, then flows into the welding gun at the butt end for circulation, flows out from the welding gun, enters the first cooling hole 11, passes through the optical fiber seat 1 and flows back to the welding host through the pipeline, thereby forming the cooling circulation.

The cooling system designed by the embodiment remarkably improves the heat management efficiency and stability of the optical fiber interface through ingenious runner layout and structural integration. Specifically, the cooling liquid is accurately led in from the first port, the complex and efficient roundabout flow channel between the cooling inner core and the outer tube is fully utilized, the instant and comprehensive absorption of heat generated by the optical fiber crystal is realized, the working temperature is effectively reduced, and the performance and the service life of the optical fiber element are ensured. Particularly, when the cooling liquid flows through the annular diameter-reducing section/diameter-expanding section at the matching position of the optical fiber output pipe and the optical fiber seat, the circumferential flow characteristic of the cooling liquid enables the flow passage to be internalized, so that an external interface is avoided, the structure is simplified, and the stability is improved.

In addition, through careful layout and seamless connection from the third cooling hole and the second cooling hole to the first cooling hole, the cooling liquid smoothly enters the welding gun and completes circulation, and the process not only realizes complete closed loop circulation flow of the cooling liquid, but also remarkably simplifies external connection of a cooling system, avoids leakage risk caused by pipeline leakage and complicated pipeline, and improves reliability and maintenance convenience of the whole system.

The cooling system of the embodiment not only accurately controls the temperature fluctuation of the interface in the welding process by realizing the high integration of the cooling liquid structure and the whole coverage of the cooling flow channel, ensures the high quality and consistency of the optical fiber welding, but also greatly optimizes the complexity and the operation efficiency of the system and brings a more stable, efficient and economic optical fiber interface solution for the welding work.

Further, referring to fig. 6-8, the runner structure includes a first blocking ring 241 and a second blocking ring 242 disposed at two ends of the gap portion, and further includes a guide plate 243 extending from the first blocking ring 241 to the second blocking ring 242, and extending circumferentially before contacting the second blocking ring 242, which is referred to as a reversing section 2431, then extending reversely toward the first blocking ring 241 and stopping extending before contacting the first blocking ring 241, wherein the height of the guide plate 243 matches the inner diameter of the outer tube 23, the height of the guide plate 243 is correspondingly reduced where the inner diameter of the outer tube 23 is small, the guide plates 243 are disposed on the cooling core 24 at 180 ° intervals, the first port 20 is connected between the reversing section 2431 on one of the guide plates 243 and the first blocking ring 241, and the second port 21 is connected between the reversing section 2431 on the other guide plate 243 and the first blocking ring 241.

In the above embodiment, the flow path of the cooling medium is as follows, referring to fig. 8, fig. 8 is a flow path layout of the cylindrical cooling core 24 of fig. 7 after the cooling flow path section is unfolded into a plane, and it should be noted that in fig. 8, the upper side edge line and the lower side edge line are the same edge line, and are unfolded lines of a cylindrical shape. The cooling core 24 is isolated from the slit portion of the outer tube 23 at both ends thereof by the first blocking ring 241 and the second blocking ring 242, respectively, and the cooling liquid enters from the first port 20, flows along the broken line toward the first blocking ring 241 side in fig. 8, flows reversely toward the second blocking ring 242 along the broken line, flows upward or downward in the drawing (actually, when the developed plane is restored to a cylindrical shape, the upper and lower sides are the same side in the drawing), then flows reversely toward the first blocking ring 241 again, flows reversely into the dead-end on the lower side guide plate 243 in fig. 8 again after reaching the first blocking ring 241, and flows out from the second port 21, so that the cooling liquid can flow circumferentially there, then reaches the third cooling hole 13 on the optical fiber holder 1, flows to the second cooling hole 12 through the third cooling hole 13, then flows out into the butt end, circulates from the optical fiber output tube 2 to the first cooling hole 11, flows back to the welding torch through the main machine 11, and flows back to the main machine 11 through the cooling hole.

The subtle design of the runner is characterized in that the cooling medium can realize omnibearing and dead-angle-free reciprocating flow along the surface of the cooling inner core, the characteristic greatly enhances the cooling effect, and the high-efficiency and uniform heat management of the laser crystal is realized. The method not only effectively avoids local overheating, ensures the optimal working state and long-term stability of the laser crystal, but also promotes the accurate control of the interface temperature in the welding process, and improves the welding quality and the production efficiency. Meanwhile, the full-coverage cooling strategy also prolongs the service life of the equipment, reduces the maintenance cost, and provides obvious economic benefit and competitive advantage for users.

Further, on the cooling core 24, there are further provided protruding strips 244 in the axial direction, the height range of the protruding strips 244 is smaller than the inner diameter of the outer tube 23, and both ends of the protruding strips 244 are not in contact with the first blocking ring 241 and the second blocking ring 242, without changing the flow path direction. The convex strips are skillfully matched with the flowing direction of the cooling medium, so that the cooling medium is guided to smoothly shuttle in a cooling system as a natural guide, the flowing resistance and the loss are reduced, and the contact area between the cooling medium and the cooling inner core is remarkably increased through the unique form of the cooling medium. The design greatly promotes the heat transfer and exchange, ensures that the heat exchange efficiency is greatly improved, ensures that the laser crystal can still maintain a stable low-temperature state under extreme working conditions, further improves the performance and reliability of the whole system, and brings more excellent performance and efficiency for the high-precision and high-power processing field.

In this embodiment, as shown in fig. 11, the shielding gas fitting group includes:

A shielding gas interface 315 provided on one side of the torch head;

The protection air hole 14 is arranged on the end face of the output interface, and a sealing ring 91 is arranged at the end face of the optical fiber seat 1 of the protection air hole 14;

When the welding gun head and the output interface are inserted, the protective gas interface 315 is in butt joint with the protective gas hole 14;

on the welding gun head, a shielding gas interface 315 enters the welding gun head body, and after exceeding the range of the shielding lens assembly and the focusing lens assembly, the shielding gas interface is introduced into the laser channel through a second communication hole 314.

The shielding gas interface 315 is introduced into the connecting part between the welding section 30 and the grasping section 31 from the tail end of the grasping section 31, then enters the welding section 30, exceeds the range of the galvanometer assembly 32 and the focusing lens assembly 33, finally is introduced into the laser channel through the second communication hole 314, finally follows the laser beam together, reaches the welding spot from the welding nozzle hole of the welding gun head, and is covered at the welding part to play a role in protection. The second communication hole 314 penetrates from the outside of the housing to the inside of the housing, communicates the shielding gas port 315 with the laser channel in the center of the housing, and finally seals the second communication hole 314 outside the housing to prevent leakage of shielding gas.

Referring to fig. 1 and 2, in conjunction with fig. 11 and 12, the electrical signal matching set includes:

an electrical signal interface 316 provided on one side of the torch head;

and a contact seat 151 provided on an end surface of the output interface;

When the welding gun head and the output interface are inserted, the electric signal interface 316 is connected with the contact base 151 in an electric signal mode, and a hole site 15 for installing the contact base 151 can be arranged on the optical fiber base;

A driving circuit board of the galvanometer motor assembly is arranged on the welding gun head, and a circuit of the electric signal interface 316 is connected with the driving circuit board. The drive circuit board can be arranged on a shell for installing the galvanometer assembly, and one side of the drive circuit board is closer to the galvanometer motor. The driving circuit board can be arranged outside the third cavity, and the galvanometer motor is arranged in the third cavity. The galvanometer assembly is a special optical device, and more particularly, it is a special oscillating motor controlled mirror plate. Unlike a common rotating motor, the rotor of the vibrating mirror cannot achieve a complete rotation, but only deflects. The angle of this deflection is proportional to the current through the galvanometer motor, and thus the galvanometer is also known as a galvanometer scanner. When the electric signal acts on the galvanometer motor through the driving circuit board, the electric signal drives the galvanometer lens to swing (vibrate) at an extremely high speed, so that the direction of the light beam is changed. The vibrating mirror assembly can remarkably improve the welding accuracy and efficiency. In particular, the galvanometer assembly enables precise orientation of the reflected direction of the laser beam, focusing the laser beam precisely on the template weld spot, which is critical to improving weld quality. In addition, the high-speed response and the accurate control characteristic of the vibrating mirror enable the welding process to be more flexible and efficient, and can meet the complex and changeable welding requirements. In the prior art, a driving circuit board of a galvanometer motor is generally arranged on a welding host, is connected to an output interface from the welding host through a wire harness, is connected with the galvanometer motor through butt joint of the output interface and a welding gun head, is an analog signal for controlling the action of the galvanometer motor between the galvanometer motor and the driving circuit board in the welding host, and is easy to interfere through long-distance transmission, so that the accuracy of the galvanometer motor in response to the control signal is reduced.

In this embodiment, the driving circuit board for controlling the action of the galvanometer motor is arranged on the welding gun head, the distance between the driving circuit board and the galvanometer motor is short, and the analog signal is not easy to be interfered. And the driving circuit board and the welding host computer CAN communicate through digital signals, for example, a Modbus bus, a Profibus or a CAN bus is used for communicating in cooperation with corresponding communication protocols, so that the accuracy and the integrity of control signals CAN be ensured, the vibrating mirror motor CAN accurately respond to the control signals, and the welding quality is improved.

In summary, the invention effectively overcomes various disadvantages in the prior art, can produce beneficial technical effects, and has remarkable progress.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. A hand-held laser welding device, characterized in that:

the welding gun comprises a welding gun head and an output interface which are mutually matched and inserted, wherein the other end of the welding gun head is used for welding, and the other end of the output interface is used for being connected with a host through a wire harness;

2. A hand-held laser welding apparatus as defined in claim 1, wherein:

The output interface comprises an optical fiber seat (1) and an optical fiber output pipe (2), wherein an optical fiber hole (10) is formed in the optical fiber seat (1), the optical fiber hole (10) axially penetrates through the optical fiber seat (1), the optical fiber output pipe (2) is arranged in the optical fiber hole (10), and both ends of the optical fiber output pipe exceed the end face of the optical fiber seat (1);

The laser matching group comprises:

the laser channel is arranged at one side of the welding gun head;

And an optical fiber output pipe (2) arranged at the output interface;

When the welding gun head and the output interface are inserted, the optical fiber output tube (2) is matched with the laser channel.

3. A hand-held laser welding apparatus as defined in claim 2, wherein:

The cooling matching group comprises a first medium port (311) and a second medium port (312) which are arranged on one side of the welding gun head, and a first cooling hole (11) and a second cooling hole (12) which are arranged on one side of the optical fiber seat (1);

The first cooling hole (11) axially penetrates through the optical fiber seat (1);

The optical fiber output tube (2) is provided with a first port (20) at the tail end part of the optical fiber seat (1), a second port (21) is arranged at the part matched with the optical fiber seat (1), and the first port (20) and the second port (21) are communicated in the optical fiber output tube (2);

The second cooling hole (12) is a blind hole which is driven into the tail end from the head end, a third cooling hole (13) is formed in the optical fiber seat (1), one end of the third cooling hole (13) is communicated with the second cooling hole (12), and the other end of the third cooling hole is communicated with the second port (21);

The first medium port (311) and the second medium port (312) are connected into the welding gun head body and then communicated to form a loop;

when the welding gun head and the output interface are inserted, the first medium port (311) and the second medium port (312) are in butt joint with the first cooling hole (11) and the second cooling hole (12).

4. A hand-held laser welding apparatus as claimed in claim 3, wherein:

An annular expanding section (101) is arranged in the optical fiber hole (10) on the optical fiber seat (1), one outlet of the third cooling hole (13) is positioned in the range of the annular expanding section (101), and a second port (21) on the optical fiber output pipe (2) is also positioned in the range of the annular expanding section (101);

And/or, an annular diameter-reducing section (22) is arranged on the optical fiber output tube (2) and is matched with the optical fiber seat (1), one outlet of the third cooling hole (13) is positioned in the range of the annular diameter-reducing section (22), and a second opening (21) on the optical fiber output tube (2) is also positioned in the range of the annular diameter-reducing section (22).

5. A hand-held laser welding device according to claim 4, wherein the optical fiber output tube (2) comprises a tail section, a cooling section and an output section which are connected in sequence, the tail section is used for connecting an optical fiber harness and a host, the cooling section is used for cooling the tail end of the optical fiber harness and the optical fiber crystal (26), and the output section is used for converting laser output by the optical fiber crystal (26) into collimated light;

the first port (20) and the second port (21) are both arranged at the cooling section.

6. A hand-held laser welding apparatus as defined in claim 5, wherein said cooling section comprises:

an outer tube (23) having an outer periphery fitted to the optical fiber holder (1);

A cooling core (24) provided in the outer tube (23) and having a slit with the outer tube (23), an optical fiber passing through the cooling core (24), and an optical fiber crystal (26) provided at an end of the cooling core (24) and emitting laser light;

the cooling inner core (24) and the two ends of the outer tube (23) are in sealing fit, and the first port (20) and the second port (21) are positioned on the outer tube (23) and the cooling inner core (24) and have gap parts.

7. A hand-held laser welding device according to claim 6, characterized in that the cooling core (24) is provided with a circuitous flow channel structure at the location of the gap with the outer tube (23), in that medium enters the gap location from the first port (20), flows along the axis of the cooling core (24) to the other end and then flows back in opposite directions, and after having so circuitous at least once, flows out of the gap location from the second port (21).

8. A hand-held laser welding apparatus according to claim 7, wherein the flow path structure comprises a first blocking ring (241) and a second blocking ring (242) provided at both ends of the slit portion;

-a guiding plate (243), which guiding plate (243) extends from the first occlusion ring (241) towards the second occlusion ring (242), extends circumferentially instead before contacting the second occlusion ring (242), this part being called reversing section (2431), then extends counter-currently towards the first occlusion ring (241) and stops extending before contacting the first occlusion ring (241);

The height of the guide plates (243) is matched with the inner diameter of the outer tube (23), the guide plates (243) are arranged on the cooling inner core (24) at intervals of 180 degrees, the first ports (20) are communicated between the reversing section (2431) and the first plugging ring (241) on one guide plate (243), and the second ports (21) are communicated between the reversing section (2431) and the first plugging ring (241) on the other guide plate (243).

9. A hand-held laser welding apparatus as claimed in claim 1, wherein said shielding gas fitting set comprises:

a shielding gas interface (315) arranged on one side of the welding gun head;

And a protective air hole (14) arranged on the end face of the output interface;

when the welding gun head and the output interface are inserted, the protective gas interface (315) is in butt joint with the protective air hole (14);

On the welding gun head, the shielding gas interface (315) enters the welding gun head body, and after exceeding the range of the shielding lens assembly and the focusing lens assembly, the shielding gas interface is communicated with a laser channel through a second communication hole (314).

10. A hand-held laser welding apparatus as claimed in claim 1, wherein said electrical signal mating set comprises:

An electrical signal interface (316) arranged on one side of the welding gun head;

and a contact seat (151) provided on the end face of the output interface;

When the welding gun head and the output interface are inserted, the electric signal interface (316) is connected with the contact seat (151) in an electric signal manner;

And a driving circuit board of the galvanometer motor assembly is arranged on the welding gun head, and a circuit of the electric signal interface (316) is connected with the driving circuit board.