Laser welding shielding gas annular output device

Abstract

The utility model relates to a laser welding shielding gas annular output device which comprises an upper connecting seat and a lower connecting seat which are fixedly connected together through a connecting plate. A copper nozzle is arranged at the bottom of the lower connecting seat; an inverted conical hole which is communicated up and down is formed in the copper nozzle, the copper nozzle is sleeved with an outer ring, and an air cavity is formed in the outer ring; the side face of the outer ring is provided with a shielding gas quick-plug connector communicated with the gas cavity, the bottom of the outer ring is connected with a shower in a screwed mode, a plurality of vertically-communicated gas outlet holes are formed in the shower in a circular array mode, the gas outlet holes are obliquely formed, and the lower ends of the gas outlet holes deviate towards the center. According to the laser welding shielding gas annular output device, larger atmosphere protection is formed around the center of a laser beam; the air knife device can blow away generated splashing welding slag and smoke dust with a large probability in the welding process, the effect of a laser welding head is not affected, the water cooling ring is installed on the portion, close to the lower air outlet hole, of the outer ring, the temperature of the blowing portion is reduced during long-time machining, and the service time is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of laser welding processing, and in particular to a laser welding protective gas ring output device. Background Technology

[0002] To improve the surface quality of the weld, laser welding provides a shielding gas to cover the weld during the welding process. The shielding gas output usually includes coaxial output, side output, coaxial side blowing combination, and zone atmosphere coverage.

[0003] Coaxial output typically uses a metal tube (mostly copper or aluminum) concentric with the beam center. The advantage is that the gas and the beam center move synchronously. The disadvantage is that when the movement speed is greater than the weld cooling speed, the protective gas will not act for a sufficient time. If the diameter is increased, welding spatter will enter the beam channel and may even accelerate the contamination of the lens.

[0004] Side gas supply can compensate for the insufficient range of coaxial gas supply, but it is directional and suitable for weld paths with a fixed welding direction. If an inappropriate angle occurs, the protective effect may be mediocre. In addition, side gas supply is usually some distance from the beam intersection point. If the gas pressure is too low, there will be no protective effect; if the gas pressure is too high, it will affect weld formation.

[0005] Area atmosphere coverage is typically used in remote welding, such as galvanometer welding. Remote welding is characterized by a large distance between the welding head and the workpiece. This is done to utilize the dynamic, high-speed advantage of the galvanometer to increase welding speed, or to reduce the chance of collision between the welding head and the workpiece in confined spaces. This involves covering a large area of ​​the welding zone. However, due to the open space, the shielding gas usually diffuses rapidly, resulting in less than ideal shielding effectiveness. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide a laser welding protective gas annular output device that forms an atmosphere protection around the center of the beam that is larger than the coaxial blowing range.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0008] A ring-shaped output device for laser welding shielding gas includes an upper connecting seat and a lower connecting seat that are vertically aligned and fixedly connected together by a connecting plate. The upper connecting seat has an upper light-transmitting hole at its top center, and the lower connecting seat has a lower light-transmitting hole at its top center, with the upper and lower light-transmitting holes corresponding vertically. A threaded hole penetrating the bottom of the lower connecting seat is located at the bottom center of the lower light-transmitting hole. A copper nozzle with a threaded connection to the threaded hole is located at the bottom of the lower connecting seat. The copper nozzle has an inverted conical structure with an inverted conical hole inside, the center of which corresponds vertically to the centers of the lower and upper light-transmitting holes. An outer ring is fitted around the copper nozzle. The top of the outer ring is fixedly connected to the bottom of the lower connecting seat, and an air chamber is provided inside it; a protective quick-connect fitting for the air chamber is provided on the side of the outer ring; a socket hole for connecting the air chamber and fitting with the outside of the copper nozzle is provided at the center of the top; a lower connecting hole for vertical connection with the air chamber is provided at the center of the bottom; the lower connecting hole is a threaded hole, and a shower head is screwed into the lower connecting hole; a connecting hole for vertical connection is provided at the center of the shower head; the lower end of the copper nozzle is embedded in the connecting hole and the bottom surface of the copper nozzle is flush with the bottom surface of the shower head; several air outlets for vertical connection are arranged in a circular array around the connecting hole; the air outlets are obliquely arranged, with their upper ends connected to the air chamber and their lower ends biased towards the center of the connecting hole.

[0009] Furthermore, the connecting plate has two pieces, symmetrically arranged on the left and right sides of the upper connecting seat and the lower connecting seat. The connecting plate and the lower connecting seat are fixedly connected together by bolts. The side has a vertically arranged elongated oval height adjustment hole at the center near the top. The side of the upper connecting seat is provided with a threaded connection hole. The height adjustment hole and the threaded connection hole correspond to each other and are fixedly connected together by T-bolts.

[0010] Furthermore, an air knife device is provided on one side of the top of the lower connecting seat. The air knife device consists of a side blowing seat and a quick-connect air blowing connector. An air channel is provided inside the side blowing seat. The quick-connect air blowing connector is fixedly installed on the top of the side blowing seat and is vertically connected to the air channel. A flat air port that communicates with the air channel is provided on the side of the side blowing seat near the bottom. The air port corresponds to the top surface of the lower connecting seat.

[0011] Furthermore, a water-cooling ring is fitted around the outer ring near the bottom surface. The upper and lower surfaces of the water-cooling ring are welded to the outer ring for a sealed connection. An annular groove is provided on the inner side of the water-cooling ring corresponding to the outer ring. The annular groove fits against the side of the outer ring to form a cooling water channel. Two quick-connect fittings for cooling water are provided on the side of the water-cooling ring. The two quick-connect fittings for cooling water are symmetrically arranged on the left and right sides. The quick-connect fittings for cooling water connect to the cooling water channel.

[0012] Furthermore, the protective gas quick-connector has two parts, arranged symmetrically on the left and right.

[0013] Compared with the prior art, the advantages of this utility model are: this laser welding protective gas ring output device can operate synchronously with the laser beam when used for welding, forming an atmosphere protection around the center of the laser beam with a larger range than that of coaxial blowing; at the same time, an air knife device is set on the lower connecting seat, so that the spatter and fumes generated during the welding process have a greater chance of being blown away, without affecting the effect of the laser welding head; a water cooling ring is installed on the outer ring near the lower air outlet to reduce the temperature of the blowing part during long-term processing and extend the service life. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the front axial side structure of a laser welding protective gas annular output device according to the present invention;

[0016] Figure 2 This is a side-axis structural diagram of a laser welding protective gas annular output device according to the present invention;

[0017] Figure 3 This is a top view schematic diagram of a laser welding protective gas annular output device according to the present invention;

[0018] Figure 4 yes Figure 3 Structural cross-sectional view of AA;

[0019] Figure 5 yes Figure 3 Structural sectional view of BB;

[0020] Figure 6 yes Figure 5 Enlarged view of the local structure;

[0021] Figure 7 This is a schematic diagram of the assembly structure of a laser welding protective gas annular output device and a laser welding head according to the present invention.

[0022] In the diagram: 1. Upper connecting seat; 11. Upper light-transmitting hole; 2. Lower connecting seat; 21. Lower light-transmitting hole; 22. Screw hole; 3. Connecting plate; 31. Height adjustment hole; 4. Outer ring; 41. Protective gas quick-connect fitting; 42. Air chamber; 43. Sleeve hole; 44. Lower connecting hole; 5. Water cooling ring; 51. Cooling water quick-connect fitting; 52. Cooling water channel; 6. Air knife device; 61. Side blow seat; 62. Air channel; 63. Air port; 64. Air blowing quick-connect fitting; 7. Copper nozzle; 71. Inverted conical hole; 8. Shower head; 81. Connecting hole; 82. Air outlet; 100. Laser beam; 200. Laser welding head. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the embodiments of the present invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate orientation or positional relationships based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships commonly used when the product of the present invention is in use, 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 orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0025] Furthermore, the use of terms such as "horizontal" or "vertical" does not imply that the component must be absolutely horizontal or vertical, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure or component must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of this utility model, "a plurality of" means at least two.

[0027] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Example

[0029] Please refer to the instruction manual attached. Figures 1 to 3 As shown, the instruction manual is attached. Figures 1 to 3 The illustration shows a specific embodiment of a laser welding shielding gas annular output device of this utility model, used for laser welding processing. This device includes an upper connecting seat 1 and a lower connecting seat 2, which are fixedly connected together by a connecting plate 3. The top of the upper connecting seat 1 is used to mount a laser welding head 200, and correspondingly, the top of the upper connecting seat 1 is provided with a fixing hole for convenient bolt fixing of the laser welding head 200. To ensure the reliable stability of the connection between the upper connecting seat 1 and the lower connecting seat 2, please refer to the appendix of the specification. Figure 1 , 2As shown in Figure 4, the connecting plate 3 has two pieces, symmetrically arranged on the left and right sides of the upper connecting seat 1 and the lower connecting seat 2. It should be noted that the connecting plate 3 and the lower connecting seat 2 are fixedly connected together by bolts. A vertically arranged elongated oval height adjustment hole 31 is located at the center of the side near the top. The upper connecting seat 1 has a threaded connection hole on its side. The height adjustment hole 31 corresponds to the threaded connection hole and is fixedly connected together by T-bolts. This ensures the accuracy of the mating position between the connecting plate 3 and the upper and lower connecting seats 1 and 2. The upper connecting seat 1 and the lower connecting seat 2 are provided with guide grooves on both sides that match the width of the connecting plate 3. The upper and lower ends of the connecting plate 3 are respectively inserted into the guide grooves on the sides of the upper connecting seat 1 and the lower connecting seat 2, thereby ensuring the accuracy of the connection between the connecting plate 3 and the upper connecting seat 1 and the lower connecting seat 2. In order to facilitate the downward passage of the laser beam 100 emitted by the laser welding head 200 on the upper connecting seat 1 without obstruction or interference, the upper connecting seat 1 has an upper light-transmitting hole 11 that is connected vertically at the top center, and the lower connecting seat 2 has a light-transmitting hole 11 at the top center. The lower light-transmitting hole 21 is provided in the center, and the upper light-transmitting hole 11 corresponds to the lower light-transmitting hole 21 vertically and belongs to the same center line. A threaded hole 22 penetrating the bottom of the lower connecting seat 2 is provided at the bottom center of the lower light-transmitting hole 21, concentrically arranged. A copper nozzle 7 is provided at the bottom of the lower connecting seat 2, the top of which is threaded into the threaded hole 22. The top of the copper nozzle 7 protrudes upwards, and the diameter of this protrusion is small, forming a stepped shape. An external thread is provided on the outer periphery of the protrusion, which threaded into the threaded hole 22. Therefore, the copper nozzle 7 passes through the protrusion at its upper end... The nozzle is screwed onto the screw hole 22; the copper nozzle 7 has an inverted conical structure, with an inverted conical hole 71 that connects the upper and lower parts inside. The center of the inverted conical hole 71 corresponds vertically to the center of the lower light-transmitting hole 21 and the upper light-transmitting hole 11, facilitating the emission of the laser beam 100; an outer ring 4 is sleeved on the outside of the copper nozzle 7, and the top of the outer ring 4 is fixedly connected to the bottom of the lower connecting seat 2 by bolts, forming a sealed fit. An air cavity 42 is provided inside the outer ring 4; a protective gas quick-connect connector 41 communicating with the air cavity 42 is provided on the side of the outer ring 4. (See the attached instruction manual.) Figure 3 and 4As shown, there are two quick-connect fittings 41 for the protective gas, arranged symmetrically on the left and right. Each quick-connect fitting 41 can be connected to an external protective gas pipeline, facilitating the delivery of protective gas into the air chamber 42. The two quick-connect fittings 41 ensure the amount of protective gas entering the chamber. The outer ring 4 has a socket hole 43 at its top center that connects to the air chamber 42 and mates with the outer surface of the copper nozzle 7. It also has a lower connecting hole 44 at its bottom center that communicates vertically with the air chamber 42. The lower connecting hole 44 is a threaded hole, and a shower head 8 is screwed into it. The outer circumference of the shower head 8 has a threaded surface that mates with the threaded connection hole 44. The shower head 8 is fixedly connected to the outer ring 4. For easier connection with the copper nozzle 7, please refer to the appendix of the instruction manual. Figures 4 to 6 As shown, the shower head 8 has a connecting hole 81 that is vertically connected at its center. The lower end of the copper nozzle 7 is embedded in the connecting hole 81, and the bottom surface of the copper nozzle 7 is flush with the bottom surface of the shower head 8. The shower head 8 has a plurality of vertically connected air outlets 82 arranged in a circular array around the connecting hole 81. The plurality of air outlets 82 in the circular array have at least two layers, extending outward from the center of the end face of the connecting hole 81 at the bottom of the shower head 8. This arrangement is to ensure that the protective gas discharged from the air outlets 82 fills the opening of the laser beam 100 emitted from the lower end of the copper nozzle 7. The vent 82 is angled, with its upper end connected to the air chamber 42, facilitating the discharge of protective gas from the air chamber 42. The lower end of the vent 82 is offset towards the center of the connecting hole 81. In the venting state, the gas blows towards the center of the bottom of the shower head 8, but not directly onto the weld seam. Instead, it creates a gaseous atmosphere between the shower head 8 and the workpiece, isolating it from external air. To cool the shower head 8 and extend its service life during prolonged processing, please refer to the appendix to the instruction manual. Figure 1 , 2 As shown in Figures 4 to 6, a water-cooling ring 5 is fitted around the outer ring 4 near its bottom surface. The upper and lower surfaces of the water-cooling ring 5 are welded together with the outer ring 4 to form a sealed connection, ensuring that the cooling water inside the water-cooling ring 5 will not leak out from the outside of the outer ring 4. An annular groove is provided on the inner side of the water-cooling ring 5 corresponding to the outer ring 4. This annular groove fits against the side of the outer ring 4 to form a cooling water channel 52. To facilitate the entry and exit of cooling water into the cooling water channel 52, two quick-connect fittings 51 for cooling water are provided on the side of the water-cooling ring 5. The two quick-connect fittings 51 are symmetrically arranged on the left and right sides. The quick-connect fittings 51 are connected to the cooling water channel 52. One quick-connect fitting 51 is connected to the cooling water inlet pipe, and the other quick-connect fitting 51 is connected to the cooling water outlet pipe.

[0030] See the attached instruction manual. Figure 1 , 2As shown in Figures 5 and 6, an air knife device 6 is provided on one side of the top of the lower connecting seat 2. The air knife device 6 consists of a side blowing seat 61 and a quick-connect air blowing connector 64. An air passage 62 is provided inside the side blowing seat 61. The quick-connect air blowing connector 64 is fixedly installed on the top of the side blowing seat 61 and is vertically connected to the air passage 62. A flat air port 63 is provided on the side of the side blowing seat 61 near the bottom, which is connected to the air passage 62. The air port 63 corresponds to the top surface of the lower connecting seat 2. When the air knife device 6 is working, a negative pressure space (Venturi effect) will be generated at the air port 63 due to the high-speed gas flow. This space will suck up some of the spatter and fumes generated at the welding position and blow them away. At the same time, the protective gas will move along this path to create a closed protective atmosphere.

[0031] In use, fix the laser welding head 200 to the top center of the upper connector 1, as shown in the instruction manual. Figure 7 As shown, the laser beam outlet of the laser welding head 200 corresponds vertically to the center of the upper light-transmitting hole 11, the lower light-transmitting hole 21, and the inverted conical hole 71. During operation, the laser beam 100 generated by the laser welding head 200 is cone-shaped and passes downward through the light-transmitting hole 11, the lower light-transmitting hole 21, and the inverted conical hole 71 to hit the workpiece. Unlike laser cutting, where heat and material are blown out of the plate by the cutting gas during the cutting process, resulting in less contamination and heat concentration on the cutting head side, laser welding heat is mainly concentrated on the plate and the worktable. Although the shower head 8 does not directly contact the workpiece surface, it is still affected by heat. Prolonged operation will keep the shower head 8 at a high temperature, and welding spatter and fumes can easily stick to it. Over time, this accumulation will block the vent 82. Welding occurs near the bottom of the outer ring 4. The water-cooling ring 5 provides a cooling measure for the bottom area of ​​the outer ring 4, extending the service life of the shower head. The gas blown out from the air port 63 in the air knife device 6 forms an air knife, which blows laterally across the upper surface of the lower connecting seat 2. This can isolate the welding slag and dust during welding. The presence of the air knife prevents the welding slag and dust from directly reaching the lower protective mirror of the laser welding head and blows them away laterally. The Venturi effect formed by the air knife creates a dynamic and sealed protective gas atmosphere from bottom to top, surrounding and covering the weld seam without causing significant gas disturbance. The multiple air outlets 82 of the shower head 8 increase the coverage of the protective gas, making it difficult for external air to enter the welding area. The blowing angle design of the air outlets 82 allows the protective gas to converge towards the center, providing sufficient gas atmosphere protection for the weld seam and better controlling the impact of external air on the weld quality.

[0032] This laser welding protective gas ring output device can operate synchronously with the laser beam 100 during welding, forming a protective atmosphere around the center of the laser beam 100 that has a larger range than that of coaxial blowing gas. At the same time, an air knife device is installed on the lower connecting seat, so that the spatter and fumes generated during the welding process have a greater chance of being blown away, without affecting the effect of the laser welding head. A water cooling ring is installed on the outer ring near the lower air outlet to reduce the temperature of the blowing part during long-term processing and extend the service life.

[0033] It should be emphasized that the above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A ring-shaped output device for laser welding shielding gas, characterized in that: The system includes an upper connecting seat (1) and a lower connecting seat (2) that are corresponding vertically, and the upper connecting seat (1) and the lower connecting seat (2) are fixedly connected together by a connecting plate (3); the upper connecting seat (1) has an upper light-transmitting hole (11) that is vertically connected at the top center, and the lower connecting seat (2) has a lower light-transmitting hole (21) that is vertically connected at the top center, and the upper light-transmitting hole (11) and the lower light-transmitting hole (21) are vertically corresponding; the lower light-transmitting hole (21) has a downward-facing light-transmitting hole at the bottom center. A threaded hole (22) is provided at the bottom of the lower connecting seat (2). A copper nozzle (7) is provided at the bottom of the lower connecting seat (2) with its top threaded into the threaded hole (22). The copper nozzle (7) has an inverted conical structure and an inverted conical hole (71) that is connected vertically inside. The center of the inverted conical hole (71) corresponds vertically to the center of the lower light-transmitting hole (21) and the upper light-transmitting hole (11). An outer ring (4) is sleeved on the outside of the copper nozzle (7). The top of the outer ring (4) is connected to the lower connecting seat (2). The bottom of the connector (2) is fixedly connected together, and an air chamber (42) is provided inside it; the outer ring (4) is provided with a protective quick-connect connector (41) that communicates with the air chamber (42) on its side, and a socket hole (43) that communicates with the air chamber (42) and is fitted with the outside of the copper nozzle (7) is provided at the top center, and a lower connecting hole (44) that communicates with the air chamber (42) from top to bottom is provided at the bottom center. The lower connecting hole (44) is a threaded hole, and a shower head is screwed into the lower connecting hole (44). (8) The shower head (8) has a connecting hole (81) that is connected vertically in the center. The lower end of the copper nozzle (7) is embedded in the connecting hole (81) and the bottom surface of the copper nozzle (7) is flush with the bottom surface of the shower head (8). The shower head (8) has a number of air outlets (82) that are connected vertically in a circular array with the connecting hole (81) as the center. The air outlets (82) are obliquely arranged, with their upper ends connected to the air chamber (42) and their lower ends biased towards the center of the connecting hole (81).

2. The laser welding shielding gas annular output device according to claim 1, characterized in that: The connecting plate (3) has two pieces, which are symmetrically arranged on the left and right sides of the upper connecting seat (1) and the lower connecting seat (2). The connecting plate (3) and the lower connecting seat (2) are fixedly connected together by bolts. The side has a vertically arranged elongated oval height adjustment hole (31) at the center near the top. The upper connecting seat (1) has a threaded connection hole on its side. The height adjustment hole (31) and the threaded connection hole correspond to each other and are fixedly connected together by T-bolts.

3. The laser welding shielding gas annular output device according to claim 1, characterized in that: An air knife device (6) is provided on one side of the top of the lower connecting seat (2). The air knife device (6) consists of a side blowing seat (61) and an air blowing quick connector (64). An air passage (62) is provided inside the side blowing seat (61). The air blowing quick connector (64) is fixedly installed on the top of the side blowing seat (61) and is vertically connected to the air passage (62). A flat air port (63) is provided on the side of the side blowing seat (61) near the bottom, which is connected to the air passage (62). The air port (63) corresponds to the top surface of the lower connecting seat (2).

4. The laser welding shielding gas annular output device according to claim 1, characterized in that: A water-cooling ring (5) is fitted around the outer ring (4) near the bottom surface. The upper and lower surfaces of the water-cooling ring (5) are welded together with the outer ring (4) to form a sealed connection. An annular groove is provided on the inner side of the water-cooling ring (5) corresponding to the outer ring (4). The annular groove fits against the side of the outer ring (4) to form a cooling water channel (52). Two quick-connect fittings (51) for cooling water are provided on the side of the water-cooling ring (5). The two quick-connect fittings (51) for cooling water are symmetrically arranged on the left and right. The quick-connect fittings (51) for cooling water are connected to the cooling water channel (52).

5. The laser welding shielding gas annular output device according to claim 1, characterized in that: The protective gas quick-connector (41) has two parts, arranged symmetrically on the left and right.

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