Automatic welding device capable of spraying anti-splashing liquid

Abstract

The invention relates to the technical field of welding equipment, and discloses an automatic welding device capable of spraying anti-splashing liquid, which comprises a mechanical arm and a high-pressure spray head in threaded connection with the outer wall of the mechanical arm and externally connected with high-pressure gas supply equipment through a connecting pipe, the output end of the high-pressure spray head is in threaded butt joint with a restraining assembly used for guiding the anti-splashing liquid in the atomized state to be sprayed out and restraining and limiting the sprayed jet flow of the anti-splashing liquid. According to the equipment, high-pressure airflow is guided to a venturi contraction section through an air branch pipe, and anti-splashing liquid is sucked in by low air pressure formed at a connecting port through the airflow; through cooperation of the first inward-contracting conical opening, the aerial fog flow dividing pipe and the second inward-contracting conical opening, an aerial fog mixture forms a main jet flow and an auxiliary jet flow, and first-stage constraint of fog drops is achieved; and meanwhile, through cooperation of the gas branch pipe, the annular guide cavity and the annular nozzle, an annular gas hood is formed through jet flow at different angles, secondary constraint is achieved, airflow interference is blocked, fog drops are accurately sprayed, and abnormity of a covering layer is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment, in particular to an automatic welding device capable of spraying anti-splash liquid. Background Art

[0002] In the field of modern industrial manufacturing, laser welding machines, with their advantages of high energy density, high precision, and non-contact processing, occupy a key position in many industries such as aerospace, shipbuilding, and the automotive industry. The aerospace industry uses laser welding to achieve precise connection of thin-walled parts, while the automotive industry uses it in car body manufacturing to improve structural strength and efficiency. With the accelerated advancement of industrial automation and intelligentization, higher requirements are placed on the welding accuracy, processing efficiency, and operational stability of laser welding equipment. In the process of laser welding, the high-energy-density laser beam instantly melts and vaporizes the metal material. The violent phase change process will produce a large amount of spatter. These spatters will not only affect the appearance of the weld surface, but also may reduce the strength and corrosion resistance of the weld joint. To solve this problem, the weld spot needs to be sprayed with anti-splash liquid before welding. The distance between the nozzle and the weld spot usually needs to be kept at about 15mm-20mm to ensure that the anti-splash liquid can effectively cover the conventional weld spot. For some special spots that are difficult to spray directly and have a small area, manual brushes and other tools are required to supplement the spraying. When spraying large-area conventional weld spots, it is difficult to accurately and constantly control the nozzle and the distance between the nozzle and the weld spot by manual spraying. The spacing and spraying amount of the solder joints not only consume a lot of manpower, but also have low spraying efficiency, which is difficult to meet the needs of large-scale production. In order to optimize the processing and improve the spraying efficiency and accuracy, it is inevitable to use a six-axis robotic arm with a dual-axis moving track to drive the nozzle to spray the solder joints accurately. When the robotic arm drives the nozzle to spray the anti-splash liquid, the anti-splash liquid is pressurized by the pumping system at one end of the nozzle and sprayed out through the nozzle structure. The liquid anti-splash liquid is subjected to high-frequency oscillation through atomization equipment such as piezoelectric ceramic high-frequency oscillation pieces to break it into tiny droplets. When it is just sprayed out through the nozzle, the mist-like anti-splash liquid is in a high-speed state and can quickly fly to the solder joint for spraying and form a thin, uniform covering layer.

[0003] However, the existing anti-splash liquid spray accessories for laser welding still have significant defects. First, the mist anti-splash liquid is light in weight and is easily affected by the ambient airflow and dissipated to the surroundings during the spraying process on the weld point, which may cause the amount of anti-splash liquid sprayed on the weld point to be uneven or insufficient. When the anti-splash liquid covering layer is too thin, it cannot effectively block the splashes, resulting in a large amount of splash marks remaining on the surface of the weld point, affecting the welding quality; and if the spraying time is increased to ensure the spraying effect, an excess residual layer may be formed on the surface of the weld point, increasing the difficulty of cleaning and even affecting the welding performance, and the drying time of the anti-splash liquid is prolonged, which ultimately affects the processing efficiency and welding protection effect, and the dissipation of the anti-splash liquid will also cause a lot of waste. The spraying time increased to ensure the spraying effect further aggravates the liquid consumption, which directly leads to a significant increase in processing costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing technology has the disadvantage that the mist-like anti-splash liquid is easily affected by the ambient airflow and escapes to the surroundings, which may lead to unstable spraying quality of the weld surface, affect the spraying efficiency, cause waste of anti-splash liquid, and increase processing costs. For this reason, we propose an automatic welding device that can spray anti-splash liquid.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions: an automatic welding device capable of spraying anti-splash liquid, comprising a robotic arm and a high-pressure nozzle threadedly connected to the outer wall of the robotic arm and connected to an external high-pressure gas supply device through a connecting pipe, the output end of the high-pressure nozzle being threadedly connected to a constraint component for guiding the anti-splash liquid in an atomized state to be sprayed out and constraining and limiting its spray jet; the constraint component comprises a connecting sleeve threadedly connected to the high-pressure nozzle, an air distribution pipe for diverting the high-pressure airflow is fixed on one side of the inner wall of the connecting sleeve, an annular guide cavity for guiding part of the high-pressure airflow is fixed on the inner wall of the connecting sleeve, a connecting port for receiving the mist anti-splash liquid is provided at the bottom end of the inner wall of the connecting sleeve and on one side of the air distribution pipe, and a port on one side of the connecting sleeve is threadedly connected to a shower nozzle for guiding the diverted high-pressure airflow and spraying it in a ring shape to form a double-layer restriction on the mist anti-splash liquid.

[0006] Preferably, a first docking section is fixed to one end of the connecting sleeve close to the high-pressure nozzle, the outer wall of the first docking section is an outer hexagonal shape, and the inner wall of the first docking section is provided with a thread matching the docking point of the outer wall of the high-pressure nozzle.

[0007] Preferably, the gas distribution pipe is welded to the inner wall of the connecting sleeve, both ends of the gas distribution pipe are tapered, and the opening diameter of one end of the gas distribution pipe close to the high-pressure nozzle is larger than the opening diameter of the other end.

[0008] Preferably, a Venturi contraction section with different opening diameters and lateral spacings on both sides is provided in the middle position of the inner wall of the connecting sleeve, and the opening diameter of the Venturi contraction section close to the gas distribution pipe is larger than that on the other side. The inner wall of the connecting sleeve and one side of the Venturi contraction section are provided with a first inward-contracting cone opening as an inward-contracting opening, and an aerosol diversion pipe is fixed to one side port of the connecting sleeve.

[0009] Preferably, the shape of the aerosol diversion tube is narrow at both ends and wide in the middle, and the opening diameter of one side of the aerosol diversion tube is slightly smaller than the opening diameter of the first inward-conical opening. The center of the aerosol diversion tube is provided with an aerosol channel with larger openings at both ends and a narrow inner wall in the middle.

[0010] Preferably, a plurality of groups of support blocks having a triangular shape in top view are fixed around the outer wall of the aerosol diversion tube at equal angles, and the central axis of the support blocks is parallel to the circular axis of the connecting sleeve.

[0011] Preferably, a first annular nozzle is obliquely opened on the end face of the shower head, a second annular nozzle is obliquely opened at the edge of the end face of the shower head and coincides with the center of the first annular nozzle, and a diversion tube cavity for connecting the high-pressure airflow is opened inside the shower head.

[0012] Preferably, the inner walls of the first annular nozzle and the second annular nozzle are respectively connected to the diversion tube cavity, and one end of the diversion tube cavity is connected to the inner wall of the annular guide cavity through a connecting pipe. The overall shape of the shower head is a "lotus pod" with one side thin and the other side thick.

[0013] Preferably, the shower nozzle is provided with a second docking section at the center of one side close to the connecting sleeve, which is threadedly docked with the outer wall of the connecting sleeve, and the inner wall of the second docking section is provided with a thread matching the outer wall of the connecting sleeve.

[0014] Preferably, a second inward-conical opening with a conical cross-section is provided at the center of the shower head and on one side of the second docking section, and the outer wall of the corresponding position of the second docking section is in an outer hexagonal shape.

[0015] Technical effects and advantages of the present invention: In the present invention, the device guides the high-pressure airflow to the Venturi contraction section through the gas distribution pipe, and uses the airflow to form a low pressure at the connecting port to draw in the anti-splash liquid; through the cooperation of the first inward-conical mouth, the aerosol diversion pipe and the second inward-conical mouth, the aerosol mixture forms a main jet and an auxiliary jet, thereby realizing the first-level constraint of the droplets; at the same time, through the cooperation of the gas distribution pipe, the annular guide cavity and the annular nozzle, a "annular air hood" is formed with jets at different angles to realize the second-level constraint, block the airflow interference, make the droplets sprayed accurately, and avoid the abnormality of the covering layer.

[0016] In the present invention, the equipment cooperates with the aerosol diversion pipe, the annular guide cavity, the first annular nozzle, and the second annular nozzle to make the mixture diffused after the two central aerosol jets hit the welding point and impact each other with the "annular air hood", thereby realizing the reuse of the scattered droplets returning to the inside of the air hood; in addition, the aerosol mixture is compressed and concentrated by parts such as the gas diversion pipe, the Venturi contraction section, the first inward-retracting cone mouth, and the constraint of the injection trajectory by the annular nozzle, thereby reducing the extension of the spraying time caused by dispersion, reducing the amount of anti-splash liquid used, and reducing the processing cost.

[0017] In the present invention, before spraying the anti-splash liquid, the equipment guides the high-pressure airflow ejected through the first annular nozzle and the second annular nozzle to form two "annular air hoods" that hit the weld point and its edge position, which can remove some fine particulate dirt, ensure the cleanliness of the weld point surface, and lay a good foundation for the welding process; and after the spraying is completed, the high-pressure airflow continuously ejected by the "annular air hood" can accelerate the air flow on the surface of the anti-splash liquid, shorten the drying time of the coating, and indirectly improve the welding efficiency; finally, a thin and uniform anti-splash liquid coating is formed on the weld point and the edge surface, which can effectively isolate welding spatter, and no complicated scraping and grinding processes are required for subsequent cleaning of welding slag, which greatly improves the appearance quality and processing efficiency of the welded parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The disclosure of the present invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components: Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a structural schematic diagram of the high-pressure nozzle and the restraining assembly of the present invention in a separated state; Figure 3 This is a schematic diagram of the structure of the main components of the constraint assembly of the present invention; Figure 4 A schematic cross-sectional view of the internal structure of the constraint assembly of the present invention; Figure 5 For the present invention Figure 4 A schematic diagram of the structure at center A; Figure 6 It is a partial cutaway schematic diagram of the restraint assembly structure of the present invention; Figure 7 This is a schematic cross-sectional view of the gas distribution pipe structure of the present invention; Figure 8 It is a schematic cross-sectional view of the shower nozzle structure of the present invention.

[0019] Legend: 1. Robotic arm; 11. High-pressure nozzle; 2. Connecting sleeve; 21. First docking section; 22. Annular guide cavity; 23. Gas distribution pipe; 24. Connecting port; 25. Venturi contraction section; 26. First inward-conical opening; 27. Aerosol diversion pipe; 3. Shower nozzle; 31. Second docking section; 32. Second inward-conical opening; 33. Diversion pipe cavity; 34. First annular nozzle; 35. Second annular nozzle. DETAILED DESCRIPTION

[0020] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention and should not be regarded as the entire invention or as a limitation or restriction of the technical solution of the present invention.

[0021] Reference Figure 1-8 As shown, the present invention provides a technical solution: an automatic welding device that can spray anti-splash liquid, comprising a robotic arm 1 and a high-pressure nozzle 11 that is threadedly connected to the outer wall of the robotic arm 1 and connected to a high-pressure air supply device through a connecting pipe. The high-pressure nozzle 11 and the robotic arm 1 are separate system modules and can be disassembled separately. When it is necessary to spray anti-splash liquid on the surface of the weld point before welding, the high-pressure nozzle 11 (and the matching air supply system) and the constraint component are assembled to the output end of the robotic arm 1 separately (or the welding head, the high-pressure nozzle 11 and the constraint component are arranged side by side, wherein a certain angle is provided between the constraint component and the high-pressure nozzle 11 and the welding head, and the output ends of the welding head, the constraint component and the high-pressure nozzle 11 are all directed to the weld point). When welding, the welding head is assembled in the same steps, and the threaded docking of the output end of the high-pressure nozzle 11 is used to guide the welding head in an atomized state. The invention relates to a constraint component for spraying anti-splashing liquid under the nozzle and constraining and limiting its spraying jet; the constraint component includes a connecting sleeve 2 threadedly connected to the high-pressure nozzle 11, and a gas distribution pipe 23 is fixed on one side of the inner wall of the connecting sleeve 2 for diverting the high-pressure airflow, and a ring-shaped guide cavity 22 is fixed on the inner wall of the connecting sleeve 2 for guiding part of the high-pressure airflow. The surface of the ring-shaped guide cavity 22 is provided with multiple groups of air supply connectors at equal angles for docking with the connecting pipe, and a connecting port 24 for receiving the mist anti-splashing liquid is provided at the bottom end of the inner wall of the connecting sleeve 2 and on one side of the gas distribution pipe 23. The connecting port 24 is connected to the atomizing device (device for atomizing the anti-splashing liquid) through a group of connecting pipes. A port on one side of the connecting sleeve 2 is threadedly docked with a shower nozzle 3 for guiding the diverted high-pressure airflow and spraying it in a ring shape to form a double-layer restriction on the mist anti-splashing liquid.

[0022] Reference Figure 2-8As shown, in this embodiment: a first docking section 21 is fixed to one end of the connecting sleeve 2 close to the high-pressure nozzle 11, and the outer wall of the first docking section 21 is an external hexagonal shape. The external hexagonal outer wall can be easily disassembled and assembled manually with the help of tools, and the inner wall of the first docking section 21 is provided with a thread that matches the docking point of the outer wall of the high-pressure nozzle 11.

[0023] Reference Figure 2-8 As shown, in this embodiment: the gas distribution pipe 23 is welded to the inner wall of the connecting sleeve 2, both ends of the gas distribution pipe 23 are tapered tubes, and the opening diameter of the end of the gas distribution pipe 23 close to the high-pressure nozzle 11 is larger than the opening diameter of the other end. The design of the gas distribution pipe 23 with a larger opening diameter at one end and a smaller opening diameter at the other end can achieve a "narrow tube effect" and improve the flow rate of the high-pressure airflow to a certain extent.

[0024] Reference Figure 2-8 As shown, in this embodiment: a Venturi contraction section 25 with different opening diameters and lateral spacings on both sides is provided in the middle position of the inner wall of the connecting sleeve 2, the opening diameter of the Venturi contraction section 25 close to the gas distribution pipe 23 is larger than the other side, and a first inward-contracting cone opening 26 is provided on the inner wall of the connecting sleeve 2 and on one side of the Venturi contraction section 25, and an aerosol diversion pipe 27 is fixed to one side port of the connecting sleeve 2.

[0025] Reference Figure 2-8 As shown, in this embodiment: the shape of the aerosol diversion tube 27 is narrow at both ends and wide in the middle, and the opening diameter of one side of the aerosol diversion tube 27 is slightly smaller than the opening diameter of the first inward-retracted cone 26, and an aerosol channel with larger openings at both ends and a narrow inner wall in the middle is opened in the center of the aerosol diversion tube 27.

[0026] Reference Figure 6-8 As shown, in this embodiment: a plurality of groups of support blocks having a triangular shape when viewed from above are fixed around the outer wall of the aerosol diversion tube 27 at equal angles, and the central axis of the support blocks is parallel to the circular axis of the connecting sleeve 2. The support blocks having a triangular shape when viewed from above can reduce the resistance of the aerosol mixture in a high-speed state to a certain extent.

[0027] Reference Figure 2-8 As shown, in this embodiment: a first annular nozzle 34 is obliquely opened on the end face of the shower head 3, a second annular nozzle 35 coinciding with the center of the first annular nozzle 34 is obliquely opened at the edge of the end face of the shower head 3, and a diversion tube cavity 33 for connecting the high-pressure airflow is opened inside the shower head 3. The focus of the injection direction of the first annular nozzle 34 and the second annular nozzle 35 coincides, and the focal length thereof (the distance from the focus to the shower head 3) is greater than 15mm-20mm. The spraying spacing can be adjusted by the robot arm 1, thereby controlling the cross-sectional size of the two-stage annular airflow and the surface of the weld. The cross-sectional size is the effective area for spraying the anti-splash liquid.

[0028] Reference Figure 6-8 As shown, in this embodiment: the inner walls of the first annular nozzle 34 and the second annular nozzle 35 are respectively connected to the diversion tube cavity 33, and one end of the diversion tube cavity 33 is connected to the inner wall of the annular guide cavity 22 through a connecting pipe. The overall shape of the shower head 3 is a "lotus pod" shape with one side thin and the other side thick.

[0029] Reference Figure 2-8 As shown, in this embodiment: a second docking section 31 is provided at the center of one side of the shower head 3 close to the connecting sleeve 2 and is threadedly docked with the outer wall of the connecting sleeve 2 , and a thread matching the outer wall of the connecting sleeve 2 is provided on the inner wall of the second docking section 31 .

[0030] Reference Figure 6-8 As shown, in this embodiment: a second inward-cone opening 32 with a conical cross-section is provided at the center of the shower head 3 and on one side of the second docking section 31 , and the outer wall of the corresponding position of the second docking section 31 is an outer hexagonal shape.

[0031] Working principle: First, open the air valve to allow high-pressure air to enter the nozzle through the connecting pipe and be ejected. Then, the high-pressure air is split into two parts through the air distribution pipe 23. Most of the high-pressure air is guided by the air distribution pipe 23 to flow to the Venturi contraction section 25. The high-speed flow of gas forms a low pressure at the connection port 24. When the air valve of the high-pressure air flow is opened, the passage between the atomizing device, the anti-splash liquid, and the connecting port 24 must also be opened. The anti-splash liquid treated by the atomizing device is in a mist state. At this time, the mist-like anti-splash liquid enters the connecting sleeve 2 from the connecting port 24. The low pressure generated by the "Venturi effect" continuously draws the anti-splash liquid in a mist form into the inner wall of the first inward-conical opening 26 inside the connecting sleeve 2. The impact of the high-pressure gas forms a high-pressure area, and the narrow opening of the first inward-conical opening 26 centrally compresses the aerosol mixture (a mixture of the anti-splash liquid and the high-pressure gas) for a short period of time. The aerosol mixture ejected from the first inwardly conical opening 26 then passes through the hollow tube of the aerosol diverter pipe 27 to form a concentrated jet, which is sprayed toward the weld point. (Note that this jet carries most of the aerosol mixture, so the anti-splash liquid concentration is high, and it serves as the main spraying point.) Another small portion of the jet is ejected in the form of an annular airflow through the gap between the aerosol diverter pipe 27 and the inner wall of the second inwardly conical opening 32. (Note that this annular airflow carries a small portion of the aerosol mixture, so the anti-splash liquid concentration is low, and it serves as an auxiliary spraying point.) This annular auxiliary jet provides a primary constraint and restriction on the anti-splash liquid (the anti-splash liquid in a mist-like state) contained in the central main aerosol jet. At the same time, after the high-pressure airflow is diverted by the gas distribution pipe 23 at the front end, another small part of the high-pressure airflow enters the annular guide cavity 22, and is then transmitted to the inside of the diversion cavity 33 through the connecting pipe connected to the annular guide cavity 22, and finally ejected through the first annular nozzle 34 and the second annular nozzle 35 respectively. With the help of the first annular nozzle 34 and the second annular nozzle 35 with different injection angles, the high-pressure airflow (in a pure state and without mist anti-splash liquid) is ejected in an annular shape, achieving the effect of an "annular air hood", and performing double constraints and restrictions on the two gas mist mixtures ejected at the center position (referring to constraining the mist anti-splash liquid emitted during injection), thereby reducing the escape of the mist anti-splash liquid to a certain extent, reducing the phenomenon of repeated spraying on the surrounding adjacent welding points, indirectly improving the processing speed, and at the same time, to a certain extent, reducing the amount of anti-splash liquid used, reducing the processing cost; Finally, the aerosol jet at the center directly impacts the weld spot, and at this time, it diffuses in a circular shape around due to the impact. At this time, the "annular auxiliary jet" composed of the aerosol mixture will also diffuse due to the impact on the weld spot. At this time, the diffused matter formed by the impact on the weld spot (referring to the diffusion of the mixture of high-speed flowing gas and mist anti-splash liquid after impacting the weld spot) will impact each other, and the diffused matter formed by the impact on the weld spot will return to the inside of the "annular auxiliary jet" for reuse. Then, with the help of the "annular air cover" formed by two annular high-pressure airflows, the diffused matter formed by the jet composed of the aerosol mixture impacting the weld spot is doubly protected and offset, further intercepting the escaped mist anti-splash liquid, and realizing a part of the anti-splash liquid (mist). Reuse reduces the use of anti-splash liquid to a certain extent, and before spraying the weld with anti-splash liquid, the two sets of high-pressure "annular air hoods" on the outer ring can play a role in pre-cleaning the weld and the surrounding fine particles of dirt, ensuring the cleanliness of the weld surface and providing a good processing condition for the subsequent welding process. After the spraying of the weld surface is completed, the two sets of high-pressure "annular air hoods" on the outer ring can accelerate the air drying of the anti-splash liquid coating on the weld surface, improve the drying efficiency of the coating, reduce the drying time, and indirectly improve the welding efficiency. Finally, a thin and uniform layer of anti-splash liquid coating will be formed on the weld and edge surface sprayed with anti-splash liquid, which is easy to clean the welding slag later, reduces the scraping, grinding and other processes after welding, and improves the appearance quality of the welded parts.

[0032] The technical scope of the present invention is not limited to the contents of the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. An automatic welding device capable of spraying anti-splash liquid, characterized in that: It includes a robotic arm and a high-pressure nozzle that is threadedly connected to the outer wall of the robotic arm and is connected to a high-pressure air supply device through a connecting pipe. The output end of the high-pressure nozzle is threadedly connected to a constraint component for guiding the anti-splash liquid in an atomized state to be sprayed out and constraining and limiting its spray jet; the constraint component includes a connecting sleeve threadedly connected to the high-pressure nozzle, and an air distribution pipe for diverting the high-pressure airflow is fixed on one side of the inner wall of the connecting sleeve. An annular guide cavity for guiding part of the high-pressure airflow is fixed on the inner wall of the connecting sleeve. A connecting port for receiving the mist anti-splash liquid is provided at the bottom end of the inner wall of the connecting sleeve and on one side of the air distribution pipe. A port on one side of the connecting sleeve is threadedly connected to a shower nozzle for guiding the diverted high-pressure airflow and spraying it in a ring shape to form a double-layer restriction on the mist anti-splash liquid.

2. The automatic welding device capable of spraying anti-splash liquid according to claim 1, characterized in that: A first docking section is fixed to one end of the connecting sleeve close to the high-pressure nozzle. The outer wall of the first docking section is in an outer hexagonal shape, and the inner wall of the first docking section is provided with a thread matching the docking position of the outer wall of the high-pressure nozzle.

3. The automatic welding device capable of spraying anti-splash liquid according to claim 1, characterized in that: The gas distribution pipe is welded to the inner wall of the connecting sleeve. Both ends of the gas distribution pipe are tapered tubes, and the opening diameter of one end of the gas distribution pipe close to the high-pressure nozzle is larger than the opening diameter of the other end.

4. The automatic welding device capable of spraying anti-splash liquid according to claim 1, characterized in that: A Venturi contraction section with different opening diameters and lateral spacings on both sides is provided in the middle position of the inner wall of the connecting sleeve. The opening diameter of the Venturi contraction section close to the gas distribution pipe is larger than that on the other side. A first inward-contracting cone opening is provided on the inner wall of the connecting sleeve and on one side of the Venturi contraction section. An aerosol diversion pipe is fixed to one side port of the connecting sleeve.

5. The automatic welding device capable of spraying anti-splash liquid according to claim 1, characterized in that: The shape of the aerosol diversion tube is narrow at both ends and wide in the middle, and the opening diameter of one side of the aerosol diversion tube is slightly smaller than the opening diameter of the first inward-conical opening. The center of the aerosol diversion tube is provided with an aerosol channel with larger openings at both ends and a narrow inner wall in the middle.

6. The automatic welding device capable of spraying anti-splash liquid according to claim 1, characterized in that: A plurality of support blocks having a triangular shape when viewed from above are fixed around the outer wall of the aerosol diversion pipe at equal angles, and the central axis of the support block is parallel to the circular axis of the connecting sleeve.

7. The automatic welding device capable of spraying anti-splash liquid according to claim 1, characterized in that: The end face of the shower head is inclined to open a first annular nozzle, the edge of the end face of the shower head is inclined to open a second annular nozzle that coincides with the center of the first annular nozzle, and the interior of the shower head is opened with a diversion tube cavity for connecting high-pressure airflow.

8. The automatic welding device capable of spraying anti-splash liquid according to claim 1, characterized in that: The inner walls of the first annular nozzle and the second annular nozzle are respectively connected to the diversion tube cavity, and one end of the diversion tube cavity is connected to the inner wall of the annular guide cavity through a connecting pipe. The overall shape of the shower head is a "lotus pod" with one side thin and the other side thick.

9. The automatic welding device capable of spraying anti-splash liquid according to claim 1, characterized in that: The shower nozzle is provided with a second docking section at a center position of one side of the connecting sleeve and connected with the outer wall of the connecting sleeve through a thread. The inner wall of the second docking section is provided with a thread matching the outer wall of the connecting sleeve.

10. The automatic welding device capable of spraying anti-splash liquid according to claim 1, characterized in that: A second inward-conical opening with a conical cross-section is provided at the center of the shower head and on one side of the second docking section, and the outer wall of the corresponding position of the second docking section is in an outer hexagonal shape.

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