A handheld laser welding gun and assembly method thereof

Abstract

The present invention relates to a handheld laser welding gun and an assembly method thereof. The laser welding gun comprises a welding gun body, the welding gun body having a gun head, a handheld part and a connecting part connecting the handheld part and the gun head; an optical path channel is provided in the welding gun body, which runs from the handheld part to the gun head; a water inlet and a water outlet are provided on the connecting part; a water transport channel is provided on the connecting part corresponding to the water inlet and the water outlet; a return water channel is provided on the gun head, which connects the water transport channels corresponding to the water inlet and the water outlet respectively; the water transport channels corresponding to the water inlet and the water outlet respectively and the return water channel constitute a circulating water cooling channel; a wiring groove running through both ends of the handheld part is provided in the handheld part, and the water inlet and the water outlet are both directly opposite to the wiring groove; the overall structure of the present invention is simple; an internal circulating water cooling structure is constituted by the water transport channel and the return water channel, so that the welding gun body can be quickly cooled, the service life of internal components is protected, the service life of the welding gun is prolonged, and the operator's comfort level is improved.

Description

Technical Field

[0001] The invention relates to the technical field of laser welding, and in particular to a handheld laser welding gun and an assembly method thereof. Background Art

[0002] Laser welding machine, also often called laser welding machine, laser welding machine, is a machine used for laser material processing. According to its working mode, it is divided into laser mold welding machine, automatic laser welding machine, laser spot welding machine, and fiber transmission laser welding machine. Laser welding uses high-energy laser pulses to locally heat the material in a small area. The energy of laser radiation diffuses to the inside of the material through heat conduction, and the material is melted to form a specific molten pool to achieve the purpose of welding. In the laser welding process, not only does the gun body heat up due to the high-energy laser beam passing through the gun body, but also the plasma / metal vapor cloud above the molten pool is directly irradiated by the laser and radiated by the molten pool. The center temperature will be as high as 5000K or more, forming a high-temperature gradient field on the upper surface space of the molten pool, and the spatter of the molten pool also carries a lot of heat energy. These factors will cause the temperature of the gun body to rise. Therefore, when it works for a long time, the high temperature generated by the laser will affect the life of the internal optical path lens and even endanger the life of the operator.

[0003] In addition, the laser welding guns currently on the market have a complex structure and are composed of too many components, which greatly increases the production precision requirements of each component. This not only causes a certain amount of deviation between the parts after the parts are assembled, resulting in an increase in the product defective rate, but also leads to a significant increase in the material cost, labor cost and time cost of production and processing, which is not conducive to the company's production. Summary of the invention

[0004] The purpose of the present invention is to provide a handheld laser welding gun and an assembly method thereof in view of the deficiencies in the prior art, and the handheld laser welding gun and the assembly method thereof can well solve the above-mentioned problems.

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

[0006] A handheld laser welding gun is provided, comprising a welding gun body, wherein the welding gun body comprises a gun head and a handheld part and a connecting part connecting the handheld part and the gun head; an optical path channel is arranged in the welding gun body from the handheld part to the gun head, a water inlet and a water outlet are arranged on the connecting part, a water transport channel is arranged on the connecting part corresponding to the water inlet and the water outlet, a return water channel is arranged on the gun head for connecting the water transport channels corresponding to the water inlet and the water outlet respectively, the water transport channel and the return water channel corresponding to the water inlet and the water outlet respectively constitute a circulating water cooling channel, a wiring groove is arranged in the handheld part for passing through both ends thereof, and the water inlet and the water outlet are both directly opposite to the wiring groove.

[0007] The handheld laser welding gun of the present invention, wherein the handheld part is composed of a collimator lens joint and a protective cover sleeved outside the collimator lens joint; there is a gap between the collimator lens joint and the protective cover, and the gap forms the wiring groove.

[0008] The handheld laser welding gun of the present invention is characterized in that a temperature sensor is provided in the gap.

[0009] The handheld laser welding gun described in the present invention is characterized in that the connecting part is provided with a mounting position for mounting the handheld part, the handheld part is detachably arranged on the mounting position, the connecting part is provided with a mounting platform corresponding to the gun head, and the gun head is detachably arranged on the top surface of the mounting platform.

[0010] The handheld laser welding gun described in the present invention is characterized in that the inlet and outlet of the water return channel are both located on a side wall of the gun head facing the mounting platform, the connecting portion is provided with two water inlet grooves and a water return groove respectively connected to the water inlet and the water outlet, a first channel connected to the top surface of the mounting platform is provided on the bottom surface of the water inlet groove away from the water inlet, a second channel connected to the top surface of the mounting platform is provided on the bottom surface of the water return groove away from the water outlet, a sealing cover plate for sealing the water inlet groove and the water return groove is provided on the connecting portion, and when assembled in place, the inlet and outlet of the water return channel are respectively connected to the first channel and the second channel; the water inlet groove, the water return groove, the first channel and the second channel together constitute the water transport channel.

[0011] The handheld laser welding gun described in the present invention is provided with an operating window for connecting the optical path channel inside the connecting part, and a countersunk hole adapted to the shape of the sealing cover plate is formed on the connecting part around the operating window, and the water inlet groove and the water return groove are both located on the bottom surface of the countersunk hole.

[0012] The handheld laser welding gun of the present invention, wherein the assembly process is as follows:

[0013] Step S10: fixing the collimating lens joint in the protective cover, and fixing the reflective lens group on the optical path inside the connecting part;

[0014] Step S20: fix the gun head to the mounting platform through a connector, pass the corresponding external water cooling circulation pipe through the wiring groove and connect it to the water inlet and the water outlet, further align the collimator lens joint and the optical path in the connecting part, and fix the handheld part to the mounting position through a connector;

[0015] Step S30: sealing the sealing cover plate on the water inlet groove and the water return groove, and further sealing the operation window.

[0016] The handheld laser welding gun of the present invention, wherein the welding gun body is made of a metal material that is a good thermal conductor.

[0017] The handheld laser welding gun of the present invention is characterized in that a switch button and a display for displaying processing parameters are provided on the connecting portion.

[0018] The handheld laser welding gun of the present invention, wherein the gun head is composed of a fixing seat and an air nozzle, a notch is arranged at the end of the air nozzle, and two notches are arranged opposite to each other.

[0019] The beneficial effects of the present invention are as follows: the present invention discloses a handheld laser welding gun and an assembly method thereof, which have a simple overall structure and greatly reduce the manufacturing cost of individual parts. Since laser welding has high requirements for precision, even a small amount of error will cause the entire device to malfunction, and in severe cases, it will cause the product to be scrapped or injure the tester. The simple overall structure of the present invention avoids the high defective rate caused by the deviation error caused by the assembly of a large number of parts, and makes it convenient and quick for workers to assemble and disassemble. In addition, the design is ergonomic, making it convenient and comfortable for operators to operate. During operation, an internal circulating water cooling structure is formed by a water transport channel and a return water channel, which can quickly cool the welding gun body, timely protect the internal parts from being baked by high temperature, extend the service life of the welding gun, and improve the operator's comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work:

[0021] Figure 1It is a schematic diagram of the overall structure of the handheld laser welding gun of the present invention.

[0022] Figure 2 It is a structural explosion diagram of the handheld laser welding gun of the present invention.

[0023] Figure 3 It is a bottom view of the connecting portion of the handheld laser welding gun of the present invention.

[0024] Figure 4 It is another viewing angle diagram showing the structure of the handheld laser welding gun of the present invention in an exploded state.

[0025] Figure 5 It is another viewing angle diagram showing the structure of the handheld laser welding gun of the present invention in an exploded state.

[0026] Figure 6 It is a schematic structural diagram of the gun head of the handheld laser welding gun of the present invention.

[0027] Figure 7 It is a step diagram of the assembly method of the handheld laser welding gun of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be described clearly and completely in combination with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are partial 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 belong to the protection scope of the present invention.

[0029] The handheld laser welding gun of the preferred embodiment of the present invention is as follows Figure 1-7As shown, the welding gun body 1 includes a welding gun body 1, the welding gun body 1 has a gun head 2 and a handheld part 3 and a connecting part 4 connecting the handheld part 3 and the gun head 2; an optical path channel 5 is provided in the welding gun body 1 from the handheld part 3 to the gun head 2 for the laser beam to pass through, and a water inlet 6 and a water outlet 7 are provided on the connecting part 4 for connecting to an external cooling circulation pipeline, and a water transport channel 8 is provided on the connecting part 4 corresponding to the water inlet 6 and the water outlet 7. Preferably, two water transport channels 8 are provided and the two are not connected. In addition, in order to further accelerate the cooling speed, the water transport channel 8 is arranged along the optical path channel 5. In order to extend the cooling time, a return water channel 9 is provided on the gun head 2, which connects the water transport channel 8 corresponding to the water inlet 6 and the water outlet 7 respectively. The return water channel 9 is arranged along the optical path channel 5. The return water channel 9 is generally U-shaped or C-shaped, etc., with a circuitous cavity structure with two end openings. The water transport channel 8 and the return water channel 9 corresponding to the water inlet 6 and the water outlet 7 respectively constitute a circulating water cooling channel. A wiring groove 10 running through both ends of the handheld part 3 is provided in the handheld part 3, and the water inlet 6 and the water outlet 7 are both opposite to the wiring groove 10, so as to facilitate the arrangement of connecting lines and external cooling circulation pipelines. The invention discloses a handheld laser welding gun and an assembly method thereof. The overall structure is simple. The setting method of partially opening holes and slots does not require too many sealing components to ensure the sealing problem. Compared with the method of fully opening holes to form cooling channels and adding a cooling base with a special cooling channel on the welding gun body 1, it has the advantages of long service life, fast assembly and disassembly, and convenient processing, which greatly reduces the manufacturing cost of each component. Moreover, due to the high precision requirements for laser welding, even a small amount of error will cause the entire device to fail to work normally, and in severe cases, it will cause the product to be scrapped or injure the tester. The overall structure of the present invention is simple, thereby avoiding the deviation error caused by the assembly of a large number of parts and resulting in a high defective rate. At the same time, it makes it convenient and quick for workers to assemble and disassemble. In addition, the design is ergonomic, so that the operator is convenient and comfortable when operating. During work, the internal circulating water cooling structure is formed by the water transport channel 8 and the return water channel 9, which can quickly cool the welding gun body 1, timely protect the internal components from being baked by high temperature, extend the service life of the welding gun, and improve the operator's comfort.

[0030] Preferably, the hand-held part 3 is composed of a collimator lens joint 11 and a protective cover 12 mounted on the outside of the collimator lens joint 11, and the collimator lens joint 11 can pass the incident laser beam; there is a gap 13 between the collimator lens joint 11 and the protective cover 12, and the gap 13 forms a wiring groove 10, which is convenient for layout and wiring on the one hand, and a heat isolation layer is formed by the gap 13 on the other hand, thereby reducing the heat transferred to the protective cover 12 through heat transfer, avoiding the protective cover 12 from getting hot, and thus making it easier for the operator to hold.

[0031] Preferably, a temperature sensor (not shown) is provided in the gap 13, and the sensor can be connected to a control console (not shown) through a connecting line to prevent the temperature of the hand-held part 3 from being too high. When the temperature is too high, it is convenient for the operator to take corresponding emergency measures in time, or directly shut down the welding gun body 1 through the control console to prevent the collimating lens assembly in the hand-held part 3 from being damaged.

[0032] Preferably, a mounting position 14 for mounting the hand-held part 3 is provided on the connecting part 4, and the hand-held part 3 is detachably arranged on the mounting position 14. A mounting platform 15 is provided on the connecting part 4 corresponding to the gun head 2, and the gun head 2 is detachably arranged on the top surface of the mounting platform 15 to facilitate assembly and disassembly.

[0033] Preferably, the inlet 91 and the outlet 92 of the water return channel 9 are both located on a side wall of the gun head 2 facing the mounting platform 15. In the actual production process, in order to facilitate processing while taking into account the excellent cooling and heating effects, two grooves 16 with a certain depth are opened on the side wall of the gun head 2 facing the mounting platform 15, and two through holes 17 are further opened on the other side walls of the gun head 2, which are cross-connected with the two grooves 16. At this time, the two through holes 17 can be connected through a connecting pipe to form a water return channel 9, and further form a circulating water cooling channel with the water transport channel 8. The grooves 16 and the water transport channel 8 corresponding to the two through holes 17 can also be separately formed into a cooling circuit to form two circulating water cooling channels. Here, the water outlet 7 is also used as the water inlet end, and the two through holes 17 are used as the water outlet ends. During the actual welding process, different arrangements can be selected according to the different heat generation of lasers with different powers. The former is suitable for the situation where the heat generation is small and no rapid cooling is required, so as to save the re-cooling of cooling water. The energy required, while the latter is suitable for the situation of high power and high heat generation. The welding gun body 1 is quickly cooled through the double-circulation water cooling channel to ensure the normal operation of the welding gun body 1 and avoid delaying the production and processing process; the connecting part 4 is provided with two water inlet grooves 18 and return water grooves 19 respectively connected to the water inlet 6 and the water outlet 7, and the bottom surface of the end of the water inlet groove 18 away from the water inlet 6 is provided with a first channel 20 connected to the top surface of the mounting platform 15, and the bottom surface of the end of the return water groove 19 away from the water outlet 7 is provided with a second channel 21 connected to the top surface of the mounting platform 15. The connecting part 4 is provided with a sealing cover plate 22 for sealing the water inlet groove 18 and the return water groove 19. When assembled in place, the inlet 91 and the outlet 92 of the return water channel 9 are respectively connected to the first channel 20 and the second channel 21, and a sealing ring can be configured to ensure the sealing requirements; the water inlet groove 18, the return water groove 19, the first channel 20 and the second channel 21 together constitute the water transport channel 8, and the water transport channel 8 is formed by grooving, which can greatly reduce the difficulty of processing.

[0034] Preferably, the connecting portion 4 is provided with an operating window 23 connected to the optical path channel 5 inside thereof. Specifically, the operating window 2 is located on the left side wall of the connecting portion 4. Since the welding gun body 1 has the function of adjusting the light beam spot, a plurality of movable reflective lenses 101 and a plurality of fixed reflective lenses 102 are embedded inside the connecting portion 4, as well as a driving motor 103 for driving the movable reflective lenses to move. Therefore, the opening of the operating window 23 not only facilitates the processing and molding of the internal optical path channel 5, but also facilitates the assembly and disassembly work. A countersunk hole 24 matching the shape of the sealing cover plate 22 is formed on the part 4 around the operating window 23. The water inlet groove 18 and the return water groove 19 are both located on the bottom surface of the countersunk hole 24. When disassembly and maintenance are required, there is no need to disassemble the entire welding gun body 1. The status of the components on the internal optical path channel 5 can be observed by disassembling the sealing cover plate 22, which is convenient and quick. Moreover, the operating window 23, the water inlet groove 18 and the return water groove 19 can be sealed at the same time through a sealing member, that is, the sealing cover plate 22, which achieves multiple goals at one stroke and saves the setting of redundant sealing components.

[0035] Preferably, the assembly method of the handheld laser welding gun is implemented as follows:

[0036] Step S10: fix the collimator lens connector 11 in the protective cover 12, and fix the reflector lens group on the optical path channel 5 inside the connecting part 4;

[0037] Step S20: fix the gun head 2 on the mounting platform 15 through the connecting piece, pass the corresponding external water cooling circulation pipe through the wiring groove 10 and connect it with the water inlet 6 and the water outlet 7, further align the collimator lens joint 11 and the optical path channel 5 in the connecting part 4, and fix the handheld part 3 on the mounting position 14 through the connecting piece;

[0038] Step S30: sealing the sealing cover plate 22 on the water inlet groove 18 and the water return groove 19, and further sealing the operation window 23.

[0039] Preferably, the welding gun body 1 is made of a metal material with good thermal conductivity, specifically an aluminum alloy plate or a stainless steel plate. However, considering the cost and weight issues, an aluminum alloy material is generally selected, and the connecting part 4 can be processed by a lathe using a single piece of aluminum alloy plate, which has a good overall effect. Compared with the molding method through mold casting or stamping, and then welding or screw fastening, it is more conducive to cost control and has stronger stability. There is no problem of weld cracking or screw loosening after long-term use.

[0040] Preferably, a switch button 25 and a display 26 for displaying processing parameters are provided on the connecting part 4. Specifically, the button is located on the front side of the connecting part 4, and the display 26 is located on the rear side of the connecting part, so as to facilitate the operator to observe and operate simultaneously without having to run back and forth between the control console and the welding station.

[0041] Preferably, the gun head 2 is composed of a fixing seat 201 and an air nozzle 202, so that coaxial blowing can be realized. The air nozzle 202 is used to constantly spray inert protective gas to prevent oxidation at the welding point due to high temperature. A notch 27 is provided at the end of the air nozzle 202. There are two notches 27 and they are arranged opposite to each other, so that part of the airflow is sprayed out from both sides of the air nozzle to form a wind wall to block floating dust and high-temperature iron slag.

[0042] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A handheld laser welding gun, characterized in that: The invention comprises a welding gun body, wherein the welding gun body comprises a gun head and a hand-held part and a connecting part connecting the hand-held part and the gun head; an optical path channel is arranged in the welding gun body from the hand-held part to the gun head, a water inlet and a water outlet are arranged on the connecting part, a water transport channel is arranged on the connecting part corresponding to the water inlet and the water outlet, a return water channel is arranged on the gun head for connecting the water transport channels corresponding to the water inlet and the water outlet respectively, the water transport channel and the return water channel corresponding to the water inlet and the water outlet respectively constitute a circulating water cooling channel, a wiring groove is arranged in the hand-held part for passing through both ends thereof, and the water inlet and the water outlet are both directly opposite to the wiring groove; The connecting part is provided with a mounting position for mounting the handheld part, the handheld part is detachably arranged on the mounting position, the connecting part is provided with a mounting platform corresponding to the gun head, the gun head is detachably arranged on the top surface of the mounting platform; Two grooves are formed on one side wall of the gun head facing the mounting platform, and two through holes are formed on the other side wall of the gun head and are respectively connected to the two grooves; The inlet and outlet of the water return channel are both located on a side wall of the gun head facing the mounting platform, the connecting portion is provided with two water inlet grooves and a water return groove respectively connected with the water inlet and the water outlet, a first channel connected to the top surface of the mounting platform is provided on the bottom surface of the water inlet groove away from the water inlet, a second channel connected to the top surface of the mounting platform is provided on the bottom surface of the water return groove away from the water outlet, a sealing cover plate for sealing the water inlet groove and the water return groove is provided on the connecting portion, and when assembled in place, the inlet and outlet of the water return channel are respectively connected with the first channel and the second channel; the water inlet groove, the water return groove, the first channel and the second channel together constitute the water transport channel; The two through holes are connected by a connecting pipe to form the water return channel and form a circulating water cooling channel with the water transport channel, or the grooves corresponding to the two through holes and the water transport channel are separately formed into a cooling circuit to form two circulating water cooling channels; The connecting part is provided with an operating window connected to the optical path channel inside the connecting part, and a countersunk hole matching the shape of the sealing cover plate is formed on the connecting part around the operating window, and the water inlet groove and the water return groove are both located on the bottom surface of the countersunk hole.

2. The handheld laser welding gun according to claim 1, characterized in that: The handheld part is composed of a collimator joint and a protective cover sleeved outside the collimator joint; there is a gap between the collimator joint and the protective cover, and the gap forms the wiring groove.

3. The handheld laser welding gun according to claim 2, characterized in that: A temperature sensor is arranged in the gap.

4. The handheld laser welding gun according to claim 1, characterized in that: The welding gun body is made of a metal material that is a good thermal conductor.

5. The handheld laser welding gun according to claim 1, characterized in that: The connecting part is provided with a switch button and a display for displaying processing parameters.

6. The handheld laser welding gun according to claim 1, characterized in that: The gun head is composed of a fixing seat and an air jet nozzle. A notch is arranged at the end of the air jet nozzle. Two notches are arranged opposite to each other.

7. A method for assembling a handheld laser welding gun, characterized in that: Using the handheld laser welding gun as described in any one of claims 2-3, the assembly process is as follows: Step S10: fixing the collimating lens joint in the protective cover, and fixing the reflective lens group on the optical path inside the connecting part; Step S20: fix the gun head to the mounting platform through a connector, pass the corresponding external water cooling circulation pipe through the wiring groove and connect it to the water inlet and the water outlet, further align the collimator lens joint and the optical path in the connecting part, and fix the handheld part to the mounting position through a connector; Step S30: sealing the sealing cover plate on the water inlet groove and the water return groove, and further sealing the operation window.

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