Air-cooled handheld laser welding gun with laser head convenient to replace

Abstract

The air-cooled handheld laser welding gun comprises a gun body and a grip connected with the gun body, a light inlet light path and a light inlet are arranged in the grip, a light outlet light path and a light outlet are arranged in the gun body, at least one group of detachably connected lens modules is arranged in each of the light inlet light path and the light outlet light path, and the lens modules are detachably connected with the grip. The gun body is provided with an adjusting assembly for reflecting laser in the light inlet light path to the light outlet light path, a reflecting mirror is arranged in the adjusting assembly, the laser is reflected from the light inlet light path to the light outlet light path through the reflecting mirror, the air cooling assembly comprises an air cooling pipe and an air cooling channel connected with the air cooling pipe, one end of the gun body is connected with a light outlet nozzle assembly, and the other end of the gun body is connected with the light outlet nozzle assembly. The light outlet nozzle assembly is connected with a light outlet pipe and a welding nozzle. According to the welding gun, the gas path is arranged around the light path, the gas path forms a loop to cool the light path, the gun body and the grip are cooled, meanwhile, the lens on the light path can be cooled, and the service life of the welding gun and parts is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of handheld laser welding guns, in particular to an air-cooled handheld laser welding gun with an easy-to-replace laser head. Background Art

[0002] Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. Laser welding is one of the important aspects of the application of laser material processing technology. Laser welding technology is increasingly used in aluminum alloy vehicle bodies due to its inherent characteristics: concentrated energy, small heat-affected zone, and small welding residual stress. During the laser welding process, it is often necessary to connect a water cooling system to the welding gun to cool the gun body. The water cooling system requires the introduction of water when cooling, and the laser welding environment often requires electricity. The presence of water is often prone to complete hidden dangers. The configuration of the cooling water system also greatly increases the cost and volume of the entire equipment, so a new cooling method is needed. At the same time, the laser head assembly of the existing welding gun cannot be disassembled, and the welding effect of using the same laser head when welding different materials is poor.

[0003] Chinese Patent Publication No. CN218694925U discloses a novel handheld laser welding gun, relating to the field of laser welding technology. The gun includes a gun head body and a gun head handle. The bottom of the gun head body is connected to the top of the gun head handle. The bottom of the gun head handle is provided with a connecting line. A nitrogen pipe is provided on the other side of the bottom of the gun head handle. A first cold water pipe and a second cold water pipe are provided on both sides of the nitrogen pipe. A laser generating mechanism and a water cooling mechanism are provided inside the gun head body. The gun head handle at the bottom of the gun head body is connected to the nitrogen pipe, the first cold water pipe and the second cold water pipe for laser welding. Nitrogen is introduced into the nitrogen pipe to eject the laser in advance or simultaneously contact the laser during welding, thereby preventing the weld part from blackening due to rapid temperature changes. The water cooling mechanism cools the weld surface through the first cold water pipe and the second cold water pipe, thereby maintaining a smooth weld before and after welding, effectively preventing deformation of the weld surface and facilitating laser welding. The patent uses a water cooling system for cooling, but its cooling effect is relatively limited and poses a safety hazard. Utility Model Content

[0004] The technical problem to be solved by the present invention is that during the laser welding process, a water cooling system is often required to cool the welding gun body. However, the water cooling system requires the introduction of water during cooling, and the laser welding environment often requires electrical connection. The presence of water often easily leads to hidden dangers. The configuration of the cooling water system also greatly increases the cost and volume of the entire equipment, thus requiring a new cooling method. At the same time, the laser head assembly of the existing welding gun is not removable, and the welding effect of using the same laser head when welding different materials is poor. In response to the above-mentioned shortcomings of the existing technology, a handheld laser welding gun with air cooling and easy replacement of the laser head is provided.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A handheld laser welding gun with air cooling and easy replacement of laser heads is constructed, comprising a gun body and a grip connected to the gun body, a light inlet path and a light inlet port being provided in the grip, a light outlet path and a light outlet being provided in the gun body, at least one set of detachably connected lens modules being provided in each of the light inlet path and the light outlet path, an adjustment component for reflecting laser light in the light inlet path to the light outlet path being provided on the gun body, a reflector being provided in the adjustment component for reflecting laser light from the light inlet path to the light outlet path through the reflector, the laser welding gun further comprising an air cooling component comprising an air cooling pipe and an air cooling channel connected to the air cooling pipe, the light path being cooled through the air cooling channel, a light outlet nozzle component being connected to one end of the gun body, the light outlet nozzle component being connected to the light outlet pipe and a welding nozzle, and the laser welding the weldment at the welding nozzle.

[0007] Preferably, the air cooling channel is arranged around the light inlet path and / or the light outlet path, and cooling gas is transported into the air cooling channel through the air cooling pipe to cool the light inlet path and / or the light outlet path.

[0008] Preferably, the air cooling channel surrounds the light inlet path and / or the light outlet path to form a gas loop to cool the light path.

[0009] Preferably, the gas loop is arranged in a spiral shape around the light inlet path and / or the light outlet path.

[0010] Preferably, the light emitting tube is sleeved on the light emitting nozzle assembly and connected to the welding nozzle, and the end face of the welding nozzle is an inclined ellipse.

[0011] Preferably, a detachably connected laser head assembly is provided at the light input path, the welding laser is emitted through the laser head assembly, and the welding head assembly is detachably connected to the handle through a locking nut.

[0012] Preferably, the welding head assembly includes a laser head that emits a welding laser, and a sleeve that is mounted outside the laser head. The laser head is fixed on the light input path through the sleeve, and a gas circulation channel is formed between the sleeve and the outer wall of the laser head. The sleeve is provided with at least one group of air inlet holes and air outlet holes that are connected to the gas circulation channel.

[0013] Preferably, the air inlet and air outlet are arranged on both sides of the sleeve and are evenly distributed on the sleeve.

[0014] Preferably, the adjustment component includes an adjustment motor and a motor drive board connected to the adjustment motor. The motor drive board controls the rotation angle of the adjustment motor to rotate the reflector. The adjustment component is connected to the gun body through an adjustment component cover, and the adjustment motor and the motor drive board are both arranged in the adjustment component cover.

[0015] Preferably, the adjustment component further comprises a toggle switch provided on the adjustment component cover, and the laser welding light is adjusted by toggle switch, and an indicator light is also provided on the adjustment component cover.

[0016] The beneficial effects of the present invention are as follows: by providing an air path around the optical path, and forming a loop, the optical path is cooled, the gun body and the grip are cooled, and the lenses on the optical path are also cooled, thereby extending the service life of the welding gun and its components. At the same time, the air cooling method is safer, its structure is simpler, and the cooling effect is better. Nitrogen can be used as a cooling gas and a protective gas at the same time, which makes welding safer and less expensive. The laser head assembly is connected to the welding gun in a detachable manner, which facilitates the replacement of the laser head, and the gas flow channel provided on the laser head cools the laser head and protects the laser head. A toggle switch is provided on the adjustment assembly, which can be used to control the start and stop of the laser welding gun in an emergency. The control is more direct and the use is safer. The motor drive board is provided on the gun body, which makes full use of the space on the welding gun, reduces the connection distance between the adjustment motor and the motor drive board, and makes signal control more direct. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of a laser welding gun according to a preferred embodiment of the present invention;

[0019] Figure 2 This is a schematic cross-sectional view of a laser welding gun according to a preferred embodiment of the present invention;

[0020] Figure 3 This is a schematic structural diagram of a laser welding gun (without the adjustment component cover) according to a preferred embodiment of the present invention;

[0021] Figure 4 This is a front structural diagram of a laser welding gun according to a preferred embodiment of the present invention;

[0022] Figure 5For the preferred embodiment of the utility model Figure 4 Schematic diagram of the cross-sectional structure of the B-B surface in FIG;

[0023] Figure 6 For the preferred embodiment of the utility model Figure 4 Schematic diagram of the cross-section structure of the C-C plane;

[0024] Figure 7 This is a schematic structural diagram of a laser head assembly according to a preferred embodiment of the present invention;

[0025] Figure 8 For the preferred embodiment of the utility model Figure 7 Schematic diagram of the cross-sectional structure of the A-A surface. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The preferred embodiment of the present invention is an air-cooled handheld laser welding gun with an easy-to-replace laser head; Figure 1 As shown in Figure 2, the gun head 2 and the handle 1 are provided with a light inlet path 100 and a spherical mirror module 102 within the handle. The spherical mirror module is positioned on the light inlet path, and a light inlet port 4 connected to the light inlet path is provided at one end of the handle. The gun head is provided with a light outlet path 23, as well as a focusing lens module 21 and a protective lens module 20. The focusing lens module 21 and the protective lens module 20 are positioned on the light outlet path, with the protective lens module positioned between the focusing lens module and the light outlet port 5. A laser nozzle 24 is provided at one end of the gun head, as well as a light outlet port 5 connected to the light outlet path. An adjustment assembly 3 is provided at the junction of the gun head and the handle, with a reflector 32 mounted on the adjustment assembly. A laser head assembly 7 is provided at the end of the handle. Laser light emitted by the laser head assembly enters the light inlet path through the light inlet, then, under the action of the reflector, changes the laser irradiation path to the light outlet path before being emitted from the light outlet for laser welding. The lower part of the handle is provided with an air cooling assembly 6, which provides protection for the light path of the laser welding operation. The side of the handle is also provided with a control button 102, which controls the laser head assembly of the welding gun to turn on and off the laser.

[0028] Specifically, such as Figure 1-3, the adjustment component 3 includes an adjustment motor 31 for driving the reflector to rotate, and a motor drive board 34 connected to the adjustment motor. The motor drive board and the adjustment motor are connected to the gun body through the adjustment component cover 30, and the upper end of the adjustment motor cover is provided with a toggle switch 33 and an indicator light 35. The toggle switch can be used to support the shutdown of the handheld laser welding gun, so that the laser welding gun can meet safety requirements and be quickly shut down. The working status of the laser welding gun can also be observed through the indicator light, which is more intuitive. The reflector is driven by the adjustment motor to rotate to change the laser light path, and the motor drive board is arranged on the gun body, which reduces the connection distance between the motor drive board and the adjustment motor, fully utilizes the space of the handheld laser welding gun, and is more stable for the control of the adjustment motor.

[0029] Furthermore, if Figure 2 and Figure 4 As shown in FIG. 6 , the air-cooling assembly 6 includes an air-cooling pipe 60 and an air-cooling channel 61 connected to the air-cooling pipe. Gas enters the air-cooling channel through the air-cooling pipe. The air-cooling channel is arranged on the optical path and cools the optical path at the same time. To further improve the cooling effect, the air-cooling channel can be arranged around the light inlet and light outlet paths, forming a circulation loop or surrounding the optical path, thereby forming a surrounding air path. The inner shell of the air path transports protective gas such as nitrogen. While providing protection during welding, it can also cool the optical path, thereby protecting the laser welding gun and improving the cooling effect of the welding gun. At the same time, the air path can also cool the lens module on the optical path, protecting the lens module and extending the service life of the lens module. It should be noted that in the present invention, the shape of the gas path is not described in detail. The gas path is arranged around the light path and the gas path channels that protect the light path should fall within the protection scope of the present invention. The gas path can be arranged around the light path in a spiral shape and connected to the tubular shape, so that the movement trajectory of cooling gases such as nitrogen around the light path can be extended as much as possible to provide better protection for the light path.

[0030] Furthermore, if Figure 7As described in Figure 8, to facilitate replacement of the laser head assembly, the laser head assembly 7 is detachably connected via a locking screw 75. The laser head assembly includes a laser head 71 and a sleeve 70 that fits over the laser head. The sleeve secures the laser head and stabilizes it within the light path. The sleeve is provided with at least two groups of air holes, with a gas flow channel 74 formed between the two groups. Air enters the gas flow channel through the air inlet 72 and exits through the air outlet 73. The gas flow channel surrounds the laser head, cooling it and protecting it. It should be noted that only one set of air inlet and outlet holes can be provided, with only a gas flow channel formed between them. Alternatively, multiple sets of air inlet and outlet holes can be provided. In the present invention, the air inlet and outlet holes can be provided on different sides or on the same side. This means that simply by forming the gas flow channel around the laser head, air can be circulated through the outer wall of the laser head to cool it and protect it. At the same time, the air inlet and outlet holes can also be set to multiple groups, and the multiple groups are evenly distributed on the sleeve, thereby improving the gas circulation effect and improving the cooling effect of the laser head.

[0031] Furthermore, if Figure 1 As shown in FIG-3 , the gun head 2 is provided with a focusing lens module 21 and a protective lens module 20. The protective lens module is provided near the light outlet. After the laser is focused by the focusing lens module in the light outlet path, it passes through the protective lens module and is emitted from the light outlet. A spherical lens module 102 is provided on the handle. After the laser passes through the spherical lens module in the light inlet path, the laser is emitted in parallel. Among them, the focusing lens module 21 and the protective lens module 20 are fixed to the gun head in a drawer-like manner, and the spherical lens module is fixed to the handle in a drawer-like manner. The specific three groups of modules and the drawer-like fixing connection method can be found in the module lenses described in patent publication number CN217370931U. This application does not repeat the three groups of modules. The three groups of laser modules are all fixed to the laser welding gun by captive screws 8. At the same time, for the specific structure and connection method of the captive screw, please refer to the captive screw recorded in patent publication number CN220863012U. This application will not repeat the specific structure of the captive screw.

[0032] Furthermore, if Figure 1 As shown in FIG. 3 , the laser nozzle 24 includes a nozzle assembly 242 connected to the light path. One end of the nozzle assembly is connected to the gun body, and the other end is connected to a light pipe 240. The light pipe is connected to a welding nozzle 241, allowing the welding laser to be emitted from the nozzle for welding. To facilitate contact between the welding nozzle and the object being welded, the end face of the welding nozzle is a cylindrical chamfered surface, and its lower end is a pointed tip, facilitating contact with the object for laser welding. The specific structure of the nozzle assembly 242 and its connection to the gun body are described in patent publication number CN220863012U. This application does not repeat the specific structure of the nozzle assembly.

[0033] Furthermore, if Figure 1 and Figure 3 As shown in FIG-4 , in order to reduce the counterweight of the laser welding gun, a plurality of weight-reducing grooves 9 are provided on the side wall of the welding gun. The weight-reducing grooves at the handle form an anti-slip portion. The weight-reducing grooves reduce the weight of the welding gun, making the welding gun lighter. The weight-reducing grooves also increase the heat dissipation surface and improve the heat dissipation effect.

[0034] It should be understood that the present invention is described by way of certain embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A handheld laser welding gun with air cooling and easy replacement of the laser head, comprising a gun body and a handle connected to the gun body, wherein a light inlet path and a light inlet port are provided in the handle, and a light outlet path and a light outlet are provided in the gun body, wherein the light inlet path and the light outlet path are each provided with at least one set of detachably connected lens modules, an adjustment component is provided on the gun body for reflecting the laser light in the light inlet path to the light outlet path, and a reflector is provided in the adjustment component for reflecting the laser light from the light inlet path to the light outlet path through the reflector, characterized in that: The laser welding gun also includes an air cooling component, which includes an air cooling pipe and an air cooling channel connected to the air cooling pipe. The light path is cooled through the air cooling channel. One end of the gun body is connected to a light outlet nozzle component, which is connected to the light outlet tube and the welding nozzle. The laser welds the weldment at the welding nozzle.

2. The handheld laser welding gun according to claim 1, characterized in that: The air cooling channel is arranged around the light inlet path and / or the light outlet path, and cooling gas is transported into the air cooling channel through the air cooling pipe to cool the light inlet path and / or the light outlet path.

3. The handheld laser welding gun according to claim 2, characterized in that: The air cooling channel surrounds the light inlet and / or light outlet path to form a gas loop to cool the light path.

4. The handheld laser welding gun according to claim 3, characterized in that: The gas loop is arranged in a spiral shape around the light inlet path and / or the light outlet path.

5. The handheld laser welding gun according to claim 1, characterized in that: The light emitting tube is sleeved on the light emitting nozzle assembly and connected to the welding nozzle. The end face of the welding nozzle is an inclined ellipse.

6. The handheld laser welding gun according to any one of claims 1 to 5, characterized in that: A detachably connected laser head assembly is provided at the light inlet path, the welding laser is emitted through the laser head assembly, and the welding head assembly is detachably connected to the handle through a locking nut.

7. The handheld laser welding gun according to claim 6, characterized in that: The welding head assembly includes a laser head that emits a welding laser, and a sleeve that is sleeved outside the laser head. The laser head is fixed on the light input path through the sleeve, and a gas circulation channel is formed between the sleeve and the outer wall of the laser head. The sleeve is provided with at least one group of air inlet holes and air outlet holes connected to the gas circulation channel.

8. The handheld laser welding gun according to claim 7, characterized in that: The air inlet and air outlet are arranged on both sides of the sleeve and are evenly distributed on the sleeve.

9. The handheld laser welding gun according to claim 1, characterized in that: The adjustment component includes an adjustment motor and a motor drive board connected to the adjustment motor. The motor drive board controls the rotation angle of the adjustment motor to rotate the reflector. The adjustment component is connected to the gun body through an adjustment component cover. The adjustment motor and the motor drive board are both arranged in the adjustment component cover.

10. The handheld laser welding gun according to claim 9, characterized in that: The adjustment component also includes a toggle switch arranged on the adjustment component cover, and the switch of the laser welding light is adjusted by the toggle switch. The adjustment component cover is also provided with an indicator light.

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