A coaxial gas protection device for welding

Abstract

The present invention relates to the field of welding technology, and in particular to a coaxial gas protection device for welding, comprising a coaxial connecting seat, a coaxial protection seat, a laser channel, a protection nozzle, and a gas uniformity component. By forming a relatively closed protective gas accommodating chamber inside the coaxial connecting seat and the coaxial protection seat, the protective gas can be stabilized and gas disorder can be prevented; by arranging a gas uniformity component in the accommodating chamber, the gas can be uniformized, and the effect of uniform gas distribution can be improved. The protective gas passes through gas channels with successively decreasing diameters, accelerating the ejected gas, forming a stable protection area and reducing the gas input flow rate. By arranging a curved groove at the bottom end of the coaxial protection seat and internally connecting a plurality of uniformly distributed gas channels, a stable spatial three-dimensional protective gas atmosphere can be formed above the weld during the welding process, resulting in a better protection effect. At the same time, it can also prevent the influence of other airflows and stabilize the welding protection effect.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and in particular to a coaxial gas protection device for welding. Background Art

[0002] Laser welding or laser-arc hybrid welding is a common welding process and has been widely used in many industries. The use of auxiliary gas shielding during the welding process has a significant impact on the welding quality: the gas can protect the molten pool and improve the weld quality. At the same time, in laser welding, it can also protect the optical lens in the laser head. Common gas shielding methods in the prior art are side-blowing gas shielding and coaxial gas shielding. Side-blowing gas shielding usually places the blowing device on one side of the welding head, and the shielding gas blows toward the weld at a certain angle. However, due to the relatively fixed blowing angle, protection can only be provided in one direction, with low positioning accuracy, unstable protection effect on the weld, and poor adaptability to complex welds. Coaxial gas shielding is when the gas nozzle and the laser beam are on the same axis. The protection effect is better, but the structure is usually more complex, and poor gas control can easily lead to poor protection stability. In addition, during laser-arc hybrid welding, due to the large amount of welding smoke and spatter impurities generated by arc welding, it is easy to enter the laser channel, thereby damaging the optical lens and poor protection effect. Summary of the Invention

[0003] The object of the present invention is to provide a coaxial gas shielded welding device to solve the prior art problems existing in the above-mentioned background technology.

[0004] In order to solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows: a welding coaxial gas protection device is provided, comprising a coaxial connecting seat, a coaxial protection seat, a laser channel, a protection nozzle and a gas uniformity component, an air inlet is provided on the outer wall of the coaxial connecting seat, the coaxial protection seat is arranged at the bottom end of the coaxial connecting seat and a accommodating cavity for accommodating gas is formed inside after being buckled, the air inlet is connected with the accommodating cavity, a curved groove is provided at the bottom end of the coaxial protection seat, the curved groove is connected to the accommodating cavity through a gas channel, a plurality of gas channels are evenly arranged, the laser channel is arranged along the axis of the coaxial connecting seat and the coaxial protection seat, the protection nozzle is detachably arranged at the bottom end of the laser channel, and a gas uniformity component for uniform gas is provided in the accommodating cavity.

[0005] Based on the above technical solution, the gas channel includes a first channel, a variable diameter throat portion and a second channel. The first channel, the variable diameter throat portion and the second channel are fixedly connected in sequence and their diameters decrease in sequence. The top end of the first channel is connected to the accommodating cavity, and the bottom end of the second channel is connected to the curved groove.

[0006] Based on the above technical solution, the gas channels are arranged in multiple groups along the circumference of the laser channel in the coaxial protection seat and are evenly distributed in radial spiral lines.

[0007] Based on the above technical solution, the gas uniformity component includes a component body, a first uniformity plate and a second uniformity plate. The first uniformity plate and the second uniformity plate are fixed to the component body and enclose each other to form an annular chamber. The first uniformity plate is provided with a first air hole, and the second uniformity plate is provided with a second air hole.

[0008] Based on the above technical solution, multiple groups of first air holes are evenly arranged along the circumference of the first uniform plate, multiple groups of second air holes are evenly arranged along the circumference of the second uniform plate, and the second air holes are staggered with the first air holes.

[0009] Based on the above technical solution, the diameters of the first air vent and the second air vent are the same and are both smaller than the diameter of the first channel.

[0010] Based on the above technical solution, a distance is provided between the bottom end surface of the protective mouth and the bottom end surface of the curved groove.

[0011] Based on the above technical solution, the coaxial connecting seat, the coaxial protection seat and the protection nozzle are all connected by threads.

[0012] The beneficial effects of the technical solution provided by the present invention are:

[0013] In the present invention, a relatively closed protective gas accommodating chamber is formed inside the coaxial connecting seat and the coaxial protective seat, which can stabilize the protective gas and prevent gas turbulence. A gas uniformity component is provided in the accommodating chamber to uniformize the gas, improve the effect of gas uniformity distribution, and enhance the protective effect of the protective gas. The protective gas passes through the gas channel and the gas channel is provided with multiple sections with successively decreasing diameters, which can accelerate the ejected gas, form a stable protective area, reduce the gas input flow rate, and save costs. By providing a curved groove at the bottom end of the coaxial protective seat and connecting multiple uniformly distributed gas channels inside, a stable spatial three-dimensional protective gas atmosphere can be formed above the weld during the welding process, producing a better protective effect. At the same time, it can also prevent the influence of other airflows and stabilize the welding protection effect, especially in the case of arc welding shielding gas, welding smoke, air knife, etc. during laser-arc hybrid welding. In addition, the hybrid welding process generates a lot of spatter, smoke, etc. The curved groove can effectively prevent the above impurities from rising into the welding channel and damaging the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0015] Figure 2 It is a structural schematic diagram of the present invention from another angle;

[0016] Figure 3 is an internal cross-sectional view of the present invention;

[0017] Figure 4 It is a structural schematic diagram of the coaxial protection seat in the present invention;

[0018] Figure 5 It is a schematic structural diagram of the gas uniformity component of the present invention;

[0019] Figure 6 Schematic diagram of the arrangement structure of the gas channels in the present invention; DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0022] In the description of the present invention, it should be understood that the terms "left", "right", "front", "back", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0023] like Figures 1 to 6 As shown, a welding coaxial gas protection device includes a coaxial connecting seat 1, a coaxial protection seat 2, a laser channel 3, a protection nozzle 4 and a gas uniformity component 5. The outer wall of the coaxial connecting seat 1 is provided with an air inlet 11, the coaxial protection seat 2 is arranged at the bottom end of the coaxial connecting seat 1 and a accommodating chamber 6 for accommodating gas is formed inside after being buckled, the air inlet 11 is connected with the accommodating chamber 6, the bottom end of the coaxial protection seat 2 is provided with a curved groove 7, the curved groove 7 is connected with the accommodating chamber 6 through a gas channel 8, and multiple gas channels 8 are evenly arranged, the laser channel 3 is arranged along the axis of the coaxial connecting seat 1 and the coaxial protection seat 2, the protection nozzle 4 is detachably arranged at the bottom end of the laser channel 3, and a gas uniformity component 5 for uniform gas is arranged in the accommodating chamber 6.

[0024] In the present invention, a relatively sealed shielding gas chamber 6 is formed inside the coaxial connector 1 and the coaxial protective seat 2, thereby stabilizing the shielding gas and preventing gas turbulence. A gas uniformization component 5 is provided within the chamber 6 to uniformize the gas, improve the uniform distribution of the gas, and enhance the shielding gas protection effect. The shielding gas passes through a gas channel 8, and the gas channel 8 is provided with multiple sections of successively decreasing diameters, which can accelerate the ejected gas, forming a stable protection zone and reducing the gas input flow rate, thus saving costs. By providing a curved groove 7 at the bottom end of the coaxial protective seat 2 and interconnecting multiple uniformly distributed gas channels 8, a stable spatial three-dimensional shielding gas atmosphere can be formed above the weld during welding, ensuring uniform distribution of the shielding gas and producing a better protection effect. The curved groove 7 can also prevent the influence of other airflows and stabilize the welding protection effect, especially during laser-arc hybrid welding, where arc welding shielding gas, welding smoke, and air knives are affected. Furthermore, the hybrid welding process generates a large amount of spatter and smoke. The curved groove 7 can effectively prevent these impurities from rising into the welding channel and damaging the optical lens. The present invention has a simple and compact structural design, a stable protection effect, and is more convenient to disassemble, assemble and maintain.

[0025] Based on the above technical solution, Figure 3 As shown, the gas channel 8 includes a first channel 81, a variable diameter throat portion 82 and a second channel 83. The first channel 81, the variable diameter throat portion 82 and the second channel 83 are fixedly connected in sequence and their diameters decrease in sequence. The top end of the first channel 81 is connected to the accommodating chamber 6, and the bottom end of the second channel 83 is connected to the curved groove 7.

[0026] By setting the gas channel 8 as a first channel 81, a variable-diameter throat portion 82 and a second channel 83 with successively decreasing diameters; according to the Venturi effect, when the restricted fluid passes through a reduced flow cross-section, the flow velocity of the fluid increases, and its flow velocity is inversely proportional to the flow cross-section; by changing the diameter ratio of the second channel 83 to the first channel 81, the speed of the shielding gas ejection can be adjusted, and the shielding gas passing through the gas channel 8 will be accelerated, which can form a more stable protection area on the one hand, and reduce the input gas flow on the other hand, saving costs.

[0027] Based on the above technical solution, Figure 6As shown, multiple gas channels 8 are arranged within the coaxial protective base 2 along the circumference of the laser path, evenly distributed in a radial spiral pattern. Since one end of the gas channels 8 connects to the accommodating cavity 6 and the other end connects to the curved groove 7, which is located above the weld, the uniform radial spiral pattern of the gas channels 8 effectively ensures a more even distribution of the blown shielding gas. Furthermore, the synergistic effect of the curved groove 7 creates a stable, three-dimensional protective atmosphere above the weld area, enhancing protection and effectively improving weld quality.

[0028] Based on the above technical solution, the gas uniformity component 5 includes a component body 51, a first uniformity plate 52 and a second uniformity plate 53. The first uniformity plate 52 and the second uniformity plate 53 are fixed to the component body 51 and enclose each other to form an annular chamber 54. The first uniformity plate 52 is provided with a first air hole 55, and the second uniformity plate 53 is provided with a second air hole 56.

[0029] Based on the above technical solution, multiple groups of first air holes 55 are evenly arranged along the circumference of the first uniform plate 52, and multiple groups of second air holes 56 are evenly arranged along the circumference of the second uniform plate 53. The second air holes 56 and the first air holes 55 are staggered.

[0030] like Figure 3 As shown, a gap is provided between the second uniform plate 53 and the bottom end of the accommodating cavity 6. More preferably, the second air holes 56 and the gas channels 8 are also staggered, that is, not correspondingly provided, which can play a better role in stabilizing the flow of the protective gas and improve the protection effect on welding.

[0031] By arranging a gas uniformization component 5 in the accommodating chamber 6, specifically, an annular chamber 54 is formed between the first uniformization plate 52, the second uniformization plate 53 and the component body 51, and through the air holes staggered on the first uniformization plate 52 and the second uniformization plate 53, the protective gas passes through the first air hole 55, the annular chamber 54 and the second air hole 56 in turn to homogenize the protective gas, further stabilize the protective gas, and effectively improve the effect of gas uniform distribution, thereby achieving a more stable gas protection effect.

[0032] Based on the above technical solution, the diameters of the first vent hole 55 and the second vent hole 56 are the same and are both smaller than the diameter of the first channel 81. By providing vent holes with smaller diameters in the gas uniformity component, the gas uniformity effect is better.

[0033] Based on the above technical solution, the inner side wall of the accommodating cavity 6 is arranged at an angle; that is, the welding coaxial gas protection device as a whole has a structure similar to an inverted cone, which can ensure that the coaxial gas protection device is contracted along the length direction, ensuring its applicability during use.

[0034] On the basis of the above technical solution, a gap is provided between the bottom end surface of the protective nozzle 4 and the bottom end surface of the curved groove 7. Specifically, the gap provided between the bottom end of the protective nozzle 4 and the two horizontal surfaces of the bottom end surface of the curved groove 7 includes two situations: one is that the length of the protective nozzle 4 is less than the height of the curved groove 7, that is, the bottom end surface of the protective nozzle 4 is arranged inside the curved groove 7, and the protective nozzle 4 is completely covered in the curved groove 7, which is particularly suitable for laser welding, and can effectively ensure that the molten pool is completely in a protective atmosphere during welding, with good protection effect and improved weld quality; the other is that the length of the protective nozzle 4 is greater than the height of the curved groove 7, that is, the bottom end surface of the protective nozzle 4 is arranged outside the curved groove 7, and the protective nozzle 4 extends out of the curved groove 7, which is particularly suitable for laser-arc hybrid welding. At this time, the curved groove 7 can effectively block other gases outside the protective nozzle 4, such as arc welding shielding gas, welding smoke, etc., which have adverse effects on laser welding, effectively ensure the welding protection effect and weld quality, and improve the problem of easy damage to the optical lens in the laser head.

[0035] On the basis of the above technical solution, the coaxial connecting seat 1, the coaxial protection seat 2 and the protection nozzle 4 are all connected by threads. In the present invention, the welding coaxial gas protection device is set as a split structure and connected in sequence by threads, which facilitates disassembly, replacement and cleaning. More preferably, the protection nozzle 4 is made of copper. It is understandable that the protection nozzle 4 can also be made of other metals or alloys. The use of the protection nozzle 4 reduces the passage of welding smoke and other gases into the laser head, reduces the risk of contamination of the optical lens of the laser head, extends the service life of the optical lens, and saves costs.

[0036] The present invention provides a coaxial gas shield device for welding, which is used in laser welding or laser-arc hybrid welding and is installed on the laser head of the welding equipment. During use, a laser source is emitted from the laser channel 3 and the shielding nozzle 4 to weld the workpiece; at the same time or more preferentially, the shielding gas enters the accommodating chamber 6 through the air inlet, and the gas is stabilized in the accommodating chamber 6; the stabilized shielding gas passes through the gas uniformity component and is improved by the action of the first uniformity plate 52 and the second uniformity plate 53; then the shielding gas is accelerated after passing through the first channel 81 and the second channel 83 in the gas channel 8. Since the gas channel 8 is distributed on the curved groove 7, the ejected gas forms a three-dimensional protective gas atmosphere above the welding area, which plays a role in protecting the weld and improving the weld quality.

[0037] The basic principles and main features of the present invention are shown and described above. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments. Therefore, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0038] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A coaxial gas shielded welding device, characterized in that: The invention comprises a coaxial connection seat (1), a coaxial protection seat (2), a laser channel (3), a protection nozzle (4) and a gas uniform component (5), wherein an air inlet (11) is provided on the outer wall of the coaxial connection seat (1), the coaxial protection seat (2) is arranged at the bottom end of the coaxial connection seat (1) and a accommodating chamber (6) for accommodating gas is formed inside the coaxial connection seat (1) after being buckled, the air inlet (11) is communicated with the accommodating chamber (6), the bottom end of the coaxial protection seat (2) is provided with a curved groove (7), the curved groove (7) is communicated with the accommodating chamber (6) through a gas channel (8), and the gas A plurality of channels (8) are evenly arranged, and the gas channel (8) includes a first channel (81) with successively decreasing diameters, a variable-diameter throat portion (82), and a second channel (83). The top end of the first channel (81) is connected to the accommodating chamber (6), and the bottom end of the second channel (83) is connected to the curved groove (7). The laser channel (3) is arranged to pass through the axis of the coaxial connecting seat (1) and the coaxial protective seat (2). The protective nozzle (4) is detachably arranged at the bottom end of the laser channel (3). A gas uniformization component (5) for uniform gas is arranged in the accommodating chamber (6).

2. A welding coaxial gas shield device according to claim 1, characterized in that: The gas channel (8) comprises a first channel (81), a variable-diameter throat portion (82), and a second channel (83). The first channel (81), the variable-diameter throat portion (82), and the second channel (83) are fixedly connected in sequence and their diameters decrease in sequence. The top end of the first channel (81) is connected to the accommodating cavity (6), and the bottom end of the second channel (83) is connected to the curved groove (7).

3. A coaxial gas shielded welding device according to claim 2, characterized in that: The gas channels (8) are arranged in multiple groups along the circumference of the laser channel (3) in the coaxial protection seat (2) and are evenly distributed in the form of radial spiral lines.

4. A welding coaxial gas shield device according to claim 2, characterized in that: The gas uniformity component (5) comprises a component body (51), a first uniformity plate (52) and a second uniformity plate (53), wherein the first uniformity plate (52) and the second uniformity plate (53) are fixedly arranged with the component body (51) and mutually enclosed to form an annular chamber (54), wherein the first uniformity plate (52) is provided with a first air vent (55), and the second uniformity plate (53) is provided with a second air vent (56).

5. A welding coaxial gas shield device according to claim 4, characterized in that: The first air holes (55) are evenly arranged in multiple groups along the circumference of the first uniform plate (52), and the second air holes (56) are evenly arranged in multiple groups along the circumference of the second uniform plate (53). The second air holes (56) and the first air holes (55) are staggered.

6. A coaxial gas shielded welding device according to claim 4, characterized in that: The diameters of the first air vent (55) and the second air vent (56) are the same and are both smaller than the diameter of the first channel (81).

7. The coaxial gas shielded welding device according to claim 1, characterized in that: A distance is provided between the bottom end surface of the protective mouth (4) and the bottom end surface of the curved groove (7).

8. The coaxial gas shielded welding device according to claim 1, characterized in that: The coaxial connecting seat (1), the coaxial protection seat (2) and the protection nozzle (4) are all connected via threads.

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