A robotic welding machine

Abstract

The present invention provides a robot welding machine, which belongs to the technical field of welding robots. The invention includes a robot body and also includes: a diversion heat conduction component and a support cleaning component; the shielding gas forms a focused airflow through diversion and secondary diversion, and the airflow ejected from the cooling channel and the air permeable plate is evenly mixed under the guidance of the conical space at the front end of the nozzle, so that the concentration distribution of the shielding gas above the molten pool is uniform, thereby improving the quality of the weld; the trace moisture in the shielding gas is processed under the action of the centrifugal force of the turbofan, and the water vapor generated by the evaporation of water droplets is guided to the periphery of the gas hood and will not invade the molten pool area; the heat conduction tube rotates to make the airflow sweep over the entire surface of the conductive nozzle, avoiding local overheating and heat dissipation dead corners, and ensuring the normal working temperature of the conductive nozzle; the airflow can clean the splashing particles adhered to the outside of the conductive nozzle and the inner wall of the nozzle, and the scraper arm can be close to the cleaning surface and kept close to the conductive nozzle during rotation, thereby reducing the possibility of deformation of the conductive nozzle and ensuring the continuity and stability of the welding process.

Description

Technical Field

[0001] The present invention relates to the technical field of welding robots, and in particular to a robot welding machine. Background Art

[0002] With the continuous progress and development of society, robots are playing an increasingly important role in people's lives. Scientists have developed numerous robots to replace human labor, saving labor and significantly improving work efficiency. In recent years, artificial intelligence (AI) technology has been widely applied in welding robots. Using machine learning, deep learning, and other algorithms, welding robots can automatically identify the type, position, and posture of workpieces, optimize welding process parameters, and achieve adaptive welding.

[0003] A search revealed that in the current application of welding robots, spatter particles generated during welding is a common problem, which is particularly serious during high-current welding. These spatter particles will adhere to the inside of the nozzle and gradually accumulate over time. The large number of particles attached to the inner wall of the nozzle will change the shape of the airflow channel, making the flow of the shielding gas uneven. The uneven airflow will cause differences in the distribution of the shielding gas above the molten pool. This uneven airflow distribution will increase the probability of weld porosity, reduce the strength and toughness of the weld, and affect the safety of the welded structure. In addition, trace moisture in the shielding gas, especially CO2 gas source, CO2 is usually stored in liquid form in cylinders (saturated vapor pressure 5.7MPa at room temperature), and the solubility of water in liquid CO2 is high (about 0.1-0.5g / L), resulting in some water being compressed and stored together with the CO2. Even after drying, trace moisture will still remain in the cylinder. In thick plate welding, the hydrogen pores and cold cracks generated by the decomposition of trace moisture in the CO2 gas source are particularly prominent, affecting the mechanical properties of the weld.

[0004] How to invent a robot welding machine to solve these problems has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In order to make up for the above shortcomings, the present invention provides a robot welding machine, which aims to solve the problems mentioned in the above background.

[0006] The present invention is achieved in that:

[0007] The present invention provides a robot welding machine, comprising a robot body, a connecting plate installed on the end flange of the robot body, a mounting clamp fixedly installed on the connecting plate, a welding gun fixedly clamped in the mounting clamp, a bent pipe installed inside the welding gun, a diverter threadedly connected to the lower end of the bent pipe, an insulating cover sleeved on the outer side of the diverter, a nozzle threadedly connected to the outer side of the diverter, a conductive nozzle support threadedly connected to the lower end of the diverter, a conductive nozzle threadedly connected to the inner side of the conductive nozzle support, a conductive nozzle located inside the nozzle, a welding wire passed through the bent pipe, an end of the welding wire passed through the conductive nozzle support and the conductive nozzle, and further comprising:

[0008] Flow-dividing heat-conducting component: the flow-dividing heat-conducting component is arranged inside the nozzle;

[0009] Support and cleaning assembly: The support and cleaning assembly is arranged inside the nozzle.

[0010] Preferably, the upper end of the nozzle is against the upper end of the insulating cover, and a sealing ring is installed at the connection between the nozzle and the insulating cover. A gas source interface is provided on one side of the welding gun for connecting the protective gas, and the inner end of the gas source interface is connected to the inner cavity of the elbow.

[0011] Preferably, a plurality of guide holes are provided on the diverter located below the outer threaded portion of the diverter, the ends of the guide holes pass through the side wall of the diverter, an air guide channel is formed between the diverter and the inner cavity of the nozzle, a positioning platform is formed inside the nozzle, a plurality of spray holes are provided on the positioning platform, and the spray holes are arranged toward the port of the nozzle.

[0012] Preferably, a through hole matching the conductive nozzle support and the conductive nozzle is opened in the middle of the positioning platform, and the plurality of guide holes and nozzle holes are distributed in an annular shape and at equal distances along the central axis of the diverter.

[0013] Preferably, the diversion heat-conducting component includes a heat-conducting tube and a fan blade structure, a limiting platform is provided on the top of the heat-conducting tube, and a limiting groove matching the limiting platform is provided on the inner side of the positioning platform. The heat-conducting tube is rotatably connected to the positioning platform through the cooperation of the limiting platform and the limiting groove, and the fan blade structure is fixed to the lower end of the heat-conducting tube, and the fan blade structure is composed of a turbofan and a baffle, the lower end of the heat-conducting tube is fixedly connected to the baffle, the turbofan is fixed to the baffle, and an air-permeable plate is fixedly connected to the outer side of the baffle, and a plurality of cooling channels are opened inside the heat-conducting tube, and the plurality of cooling channels are equidistantly distributed in a ring around the central axis of the heat-conducting tube, and the upper end of the cooling channel passes through the side wall of the heat-conducting tube, and the lower end passes through the bottom wall of the heat-conducting tube.

[0014] Preferably, there is a gap between the baffle and the inner cavity of the nozzle, the air permeable plate is provided with air holes, and the outer side of the air permeable plate abuts against the inner cavity of the nozzle.

[0015] Preferably, the nozzle is arranged opposite to the turbofan, the cooling channel is arranged in multiple sections with an inclined configuration, the upper end of the cooling channel is arranged close to the nozzle, the upper port diameter of the cooling channel is larger than the lower port diameter, and the middle part of the cooling channel is in direct contact with the outer wall of the conductive nozzle.

[0016] Preferably, the heat-conducting tube and the fan blade structure are both made of a high-thermal-conductivity alloy material, the bottom of the air-permeable plate is flush with the bottom of the baffle, and the thickness of the baffle is greater than the thickness of the air-permeable plate.

[0017] Preferably, the supporting cleaning assembly includes a cleaning brush and multiple groups of scraping arms, the cleaning brush is fixedly arranged on the lower side of the positioning platform, the scraping arm is fixedly installed on the lower side of the baffle, the scraping arm is composed of a first scraper, a second scraper and a connecting ring, the top of the connecting ring is fixedly connected to the bottom wall of the baffle, the first scraper and the second scraper are both located on the lower side of the connecting ring, the top of the first scraper is fixedly connected to the bottom of the connecting ring, and the second scraper is fixedly connected to one end of the first scraper.

[0018] Preferably, multiple groups of scraper arms are distributed equidistantly in a ring around the central axis of the conductive nozzle, the first scraper and the second scraper form an "n"-shaped support structure, the distal side wall of the first scraper is against the inner wall of the nozzle, the inner side wall of the second scraper is against the outer wall of the conductive nozzle, the lower end of the cleaning brush is against the air permeable plate, and the lower end of the first scraper is flush with the lower port of the nozzle.

[0019] The beneficial effects of the present invention are:

[0020] 1. The shielding gas forms a focused airflow through diversion and secondary diversion, and is constrained into a conical gas hood in the nozzle cavity, accurately covering the molten pool and heat-affected zone, isolating the air, and preventing oxidation in the welding area, providing a basis for high-quality welding; the airflow ejected from the cooling channel and the breathable plate is evenly mixed under the guidance of the conical space at the front end of the nozzle, so that the concentration distribution of the shielding gas above the molten pool is consistent, avoiding gas stratification and weld oxidation, and improving the weld quality; the trace moisture in the shielding gas is processed under the action of the centrifugal force of the turbofan, and the water vapor generated by the evaporation of water droplets is guided to the periphery of the gas hood and will not invade the molten pool area, ensuring that in thick plate welding, the welding quality is not affected by problems such as hydrogen holes and cold cracks caused by the decomposition of trace water in the CO2 gas source, thereby ensuring the mechanical properties of the weld.

[0021] 2. The thermal tube is in direct contact with the outer wall of the conductive nozzle, evenly transferring the heat of the conductive nozzle to the thermal tube and fan blade structure, increasing the heat dissipation area. The airflow accelerates heat dissipation and reduces the temperature of the conductive nozzle. The cooling channel and breathable plate extend the airflow residence time and improve the gas heat exchange efficiency per unit time. The rotation of the thermal tube allows the airflow to sweep across the entire surface of the conductive nozzle, avoiding local overheating and heat dissipation dead corners, ensuring the normal operating temperature of the conductive nozzle, and reducing performance degradation and damage caused by overheating. The airflow impacts the turbofan to drive the thermal tube to rotate, without the need for a motor. It is suitable for the high dust and high vibration environment of shelf welding, avoiding the risk of electrical component failure.

[0022] 3. The air permeable plate and the cleaning brush move relative to each other, and the cleaning brush effectively cleans the air permeable plate to prevent air flow turbulence caused by blockage of the air holes and reduce the frequency of manual cleaning; the first scraper rotates with the heat transfer tube to scrape off the splashing particles attached to the inner wall of the nozzle in real time, avoiding a large number of particles attached to the inner wall of the nozzle changing the shape of the air flow channel, ensuring uniform flow of shielding gas, reducing the probability of weld porosity, improving weld strength and toughness, and ensuring the safety of the welding structure; the second scraper rotates to sweep across the entire circumference of the conductive nozzle to avoid wire feeding jams caused by particle accumulation, ensuring the continuity and stability of the welding process; the first scraper and the second scraper form an "n"-shaped support structure, so that the scraper arm can be close to the cleaning surface and keep close to the conductive nozzle during rotation, reducing the possibility of deformation of the conductive nozzle, ensuring the normal working condition of the conductive nozzle, and reducing maintenance work caused by component damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a front cross-sectional structural schematic diagram of the present invention;

[0026] Figure 3 It is a schematic structural diagram of the welding gun of the present invention;

[0027] Figure 4 It is a schematic diagram of the cross-sectional structure of the welding gun of the present invention;

[0028] Figure 5 The present invention Figure 4 A in the middle is an enlarged structural diagram;

[0029] Figure 6It is a partial cross-sectional structural schematic diagram of the present invention;

[0030] Figure 7 It is a schematic diagram of the partial explosion structure of the present invention;

[0031] Figure 8 It is a schematic cross-sectional view of a local explosion structure of the present invention;

[0032] Figure 9 It is a schematic diagram of the scraper arm structure of the present invention;

[0033] Figure 10 It is a schematic diagram of the fan blade structure and the heat-conducting tube structure of the present invention.

[0034] In the figure: 1. Robot body; 2. Connecting plate; 3. Mounting plate; 4. Welding gun; 5. Bend pipe; 6. Diverter; 7. Nozzle; 8. Contact nozzle support; 9. Heat conducting tube; 10. Welding wire; 51. Gas source interface; 61. Guide hole; 62. Gas guide channel; 71. Positioning platform; 81. Contact nozzle; 82. Insulation cover; 90. Cooling channel; 91. Fan blade structure; 92. Breathable plate; 93. Scraper arm; 711. Spray hole; 712. Limiting groove; 713. Cleaning brush; 901. Limiting platform; 931. First scraper; 932. Second scraper; 933. Connecting ring. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0036] Example 1, refer to Figures 1-9A robot welding machine includes a robot body 1, a connecting plate 2 is installed on the end flange of the robot body 1, a mounting plate 3 is fixedly installed on the connecting plate 2, a welding gun 4 is fixedly connected to the mounting plate 3, the robot body 1 provides multi-axis motion power to control the trajectory accuracy of the welding gun 4, and a bend pipe 5 is installed inside the welding gun 4. The elbow 5 conveys the welding wire 10 and the shielding gas. The lower end of the elbow 5 is threadedly connected to the diverter 6. The outer side of the diverter 6 is sleeved with an insulating cover 82. The insulating cover 82 is against the nozzle 7 through the upper end face, and the lower end cooperates with the step surface of the diverter 6 to form an axial positioning to prevent the nozzle 7 from axial displacement due to gas pressure or vibration. It can also isolate the insulation and prevent the arc from breaking through the short circuit, especially when welding conductive workpieces such as shelf steel columns, to avoid welding defects caused by current diversion. The outer side of the diverter 6 is threadedly connected to the nozzle 7. The nozzle 7 can form a protective gas hood to cover the molten pool. The lower end of the diverter 6 is internally threadedly connected to the conductive nozzle support 8. The internal thread of the conductive nozzle support 8 is connected to the conductive nozzle 81. The conductive nozzle 81 is located inside the nozzle 7. The welding wire 10 is passed through the elbow 5. The end of the welding wire 10 passes through the conductive nozzle support 8 and the conductive nozzle 81. The conductive nozzle 81 conducts electricity and guides the welding wire 10. It also includes:

[0037] Splitting heat conducting component: the splitting heat conducting component is arranged inside the nozzle 7;

[0038] Support cleaning assembly: The support cleaning assembly is arranged inside the nozzle 7.

[0039] Furthermore, the upper end of the nozzle 7 is abutted against the upper end of the insulating cover 82 to form a first seal, which limits the leakage of gas from the radial gap. A sealing ring is installed at the connection between the nozzle 7 and the insulating cover 82. The sealing ring installed at the connection (mostly made of fluororubber, temperature resistant ≥200°C, aging resistant) fills the microscopic unevenness of the end surface to form a second seal. Even if the parts are slightly deformed after long-term use, the elasticity of the sealing ring can still maintain the sealing. A gas source interface 51 is provided on one side of the welding gun 4 for connecting to the protective gas. The inner end of the gas source interface 51 is connected to the inner cavity of the elbow 5, and the gas can be transported to the diverter 6 without complicated turns.

[0040] A plurality of guide holes 61 are provided on the diverter 6 below the outer threaded portion of the diverter 6. The ends of the guide holes 61 pass through the side wall of the diverter 6. An air guide channel 62 is formed between the diverter 6 and the inner cavity of the nozzle 7. After the gas enters the diverter 6 from the elbow 5, it passes through the radial guide holes 61 (annular distribution) of the diverter 6 and enters the gap between the nozzle 7 and the diverter 6 (i.e., the air guide channel 62). Finally, a protective gas cover is formed at the outlet of the nozzle 7. A positioning platform 71 is formed inside the nozzle 7 to position and preliminarily support the conductive nozzle 81. A plurality of guide holes 61 are provided on the positioning platform 71. The spray hole 711 is arranged toward the port of the nozzle 7. The airflow entering the air guide channel 62 is ejected through the spray hole 711 and is constrained by the inner cavity of the nozzle 7. A through hole matching the conductive nozzle support 8 and the conductive nozzle 81 is opened in the middle of the positioning platform 71 to ensure that the conductive nozzle 81 and the conductive nozzle support 8 can be installed smoothly. Several guide holes 61 and spray holes 711 are distributed in an equidistant manner in a ring along the central axis of the diverter 6. The equidistant distribution makes the pressure drop of the gas flowing through each hole consistent, and finally the airflow velocity ejected from the spray hole 711 is uniform to form a complete conical air hood.

[0041] Furthermore, the shunt heat conduction component includes a heat conduction tube 9 and a fan blade structure 91. A limit platform 901 is provided on the top of the heat conduction tube 9. A limit groove 712 matching the limit platform 901 is provided on the inner side of the positioning platform 71. The heat conduction tube 9 is rotatably connected with the positioning platform 71 through the cooperation of the limit platform 901 and the limit groove 712. The fan blade structure 91 is fixed to the lower end of the heat conduction tube 9. The fan blade structure 91 is composed of a turbofan and a baffle. The lower end of the heat conduction tube 9 is fixedly connected to the baffle. The turbofan is fixed to the baffle. The outer side of the baffle is fixedly connected with a breathable plate 92. The interior of the heat conduction tube 9 is provided with a A plurality of cooling channels 90 are equidistantly distributed in a circular pattern around the central axis of the heat-conducting tube 9. The upper end of the cooling channel 90 penetrates the side wall of the heat-conducting tube 9, and the lower end penetrates the bottom wall of the heat-conducting tube 9. The airflow ejected through the nozzle 711 is intercepted by the baffle, and part of it flows out through the air permeable plate 92 (corresponding to the inner wall of the nozzle 7), and part of it flows out through the cooling channel 90 (corresponding to the outer wall of the conductive nozzle 81). No additional power source such as a motor is required, and the kinetic energy of the gas is used to realize the rotation of the heat dissipation component, thereby reducing energy consumption and reducing failure points. It is suitable for high-dust shelf welding environment.

[0042] There is a gap between the baffle and the inner cavity of the nozzle 7 to ensure that the gas can flow out through the breathable plate 92. The breathable plate 92 is provided with breathable holes. The outer side of the breathable plate 92 is against the inner cavity of the nozzle 7. The airflow ejected through the breathable plate 92 will directly act on the inner cavity side wall of the nozzle 7, which not only takes away the heat from the baffle surface, but also does not affect the protection effect of the main air path; the nozzle hole 711 is set opposite to the turbofan. When the protective gas is ejected from the nozzle hole 711, a high-speed airflow is formed, which drives the turbofan to rotate, and then drives the heat-conducting tube 9 to rotate synchronously. The cooling channel 90 is arranged in a multi-section inclined manner. The upper end of the cooling channel 90 is arranged close to the nozzle 711. With its inclined arrangement, the low-temperature protective gas can be directly introduced to enhance the heat dissipation temperature difference. The upper port diameter of the cooling channel 90 is larger than the lower port diameter, which enhances the convection heat dissipation in the channel. The middle part of the cooling channel 90 is in direct contact with the outer wall of the conductive nozzle 81. The rotating heat-conducting tube 9 performs primary heat exchange, and the airflow ejected through the cooling channel 90 will perform secondary heat exchange on the heat-conducting tube 9 and the conductive nozzle 81.

[0043] It should be noted that the heat-conducting tube 9 and the fan blade structure 91 are both made of a high thermal conductivity alloy. The heat-conducting tube 9 adopts a high thermal conductivity alloy (such as copper-nickel alloy, with a thermal conductivity coefficient of 350W / (m·K)). The middle part of its cooling channel 90 is in direct contact with the outer wall of the conductive nozzle 81. Due to the rotation of the heat-conducting tube 9, the cooling channel 90 will sweep across different areas of the surface of the conductive nozzle 81 to avoid heat dissipation dead corners caused by fixed contact. The bottom of the air permeable plate 92 is flush with the bottom of the baffle, and the thickness of the baffle is greater than the thickness of the air permeable plate 92, forming a stepped structure. Under the action of the centrifugal force of the turbofan, the moisture in the protective gas can be thrown onto the air permeable plate 92, condensed into water droplets, and then flow out through the air holes, cooperating with the air flow to improve the cleaning effect of the inner wall of the nozzle 7.

[0044] In this embodiment, the robot body 1 drives the connecting plate 2, the mounting plate 3 and the welding gun 4 through the end flange to realize multi-axis linkage. The spatial position of the welding gun 4 is controlled according to the angle joint trajectory of the shelf column and the cantilever. The welding wire 10 is transported from the wire feeder through the central channel of the elbow 5, enters the conductive nozzle 81 through the guide hole of the conductive nozzle support 8, and finally extends from the front end of the conductive nozzle 81 to form an electrode of the arc; the shielding gas (such as 80% Ar + 20% CO2 mixed gas) enters the elbow 5 from the gas source interface 51, and is transported along the inner cavity of the elbow 5 to the diverter 6, completing the efficient integrated transmission of "gas-wire in the same path but different cavities".

[0045] After the gas enters the diverter 6, it enters the air guide channel 62 through the annular equidistantly distributed guide holes 61. The gas in the air guide channel 62 is secondary diverted through the nozzle holes 711 of the positioning platform 71 to form a focused airflow. Since the nozzle holes 711 are equidistantly distributed along the central axis, the ejected gas forms a conical air hood under the constraint of the inner cavity of the nozzle 7, accurately covering the molten pool and the heat-affected zone (such as the "T-shaped" dead corner of the shelf corner weld), isolating the air to prevent oxidation.

[0046] The high-speed airflow ejected from the nozzle 711 directly impacts the turbofan of the fan blade structure 91, driving the turbofan to drive the heat-conducting tube 9 to rotate about the matching axis between the limit platform 901 and the limit groove 712. No motor is required, which is suitable for the high-dust and high-vibration environment of shelf welding and eliminates the risk of electrical component failure. The heat-conducting tube 9 made of a high-thermal-conductivity alloy (copper-nickel alloy) is in direct contact with the outer wall of the conductive nozzle 81 through the middle of the cooling channel 90. It can evenly transfer the heat of the conductive nozzle 81 to the heat-conducting tube 9 and the fan blade structure 91, thereby increasing the heat dissipation area of ​​the conductive nozzle 81. Under the flow of airflow, its heat is reduced more quickly. The arrangement of the baffle, turbofan, cooling channel 90 and breathable plate 92 greatly prolongs the residence time of the airflow in the nozzle 7, thereby improving the heat exchange efficiency of the gas per unit time. At the same time, due to the rotation of the heat-conducting tube 9, the airflow sweeps across the entire surface of the conductive nozzle 81 when passing through the cooling channel 90, avoiding local overheating and avoiding heat dissipation dead corners caused by fixed contact.

[0047] The cooling channel 90 adopts a "multi-stage inclination + wide at the top and narrow at the bottom" structure. The diameter difference of the wide at the top and narrow at the bottom utilizes the Venturi effect to accelerate the airflow and enhance the convection in the channel. The multi-stage inclination setting facilitates air intake while extending the heat exchange time. The upper end of the channel is close to the nozzle 711, which can directly introduce a low-temperature gas source to improve the heat exchange performance; the airflow ejected through the nozzle 711 is intercepted by the baffle, and a part of it passes through the cooling channel 90 and directly acts on the front end of the conductive nozzle 81, which can take away the heat from the outside of the conductive nozzle 81, and at the same time clean the spatter particles adhered to the outside of the conductive nozzle 81; the other part flows to the inner wall of the nozzle 7 through the air holes of the air permeable plate 92, and takes away the heat from the baffle and the inner wall of the nozzle 7 through the airflow flushing, and at the same time cleans the spatter particles adhered to the inner wall of the nozzle 7, thereby avoiding the wire feeding jam of the welding wire 10 caused by particle accumulation. By rotating the heat-conducting tube 9 and the breathable plate 92, a spiral airflow can be formed, which has a heat exchange and cleaning effect. In addition, the airflow ejected through the cooling channel 90 and the breathable plate 92 will be evenly mixed under the guidance of the conical space at the front end of the nozzle 7, so that the concentration distribution of the protective gas above the molten pool is more uniform, thereby avoiding weld oxidation caused by gas stratification.

[0048] The trace moisture in the shielding gas (especially the CO2 gas source, CO2 is usually stored in a liquid form in a cylinder (saturated vapor pressure is 5.7MPa at room temperature), and the solubility of water in liquid CO2 is relatively high (about 0.1-0.5g / L), which causes some of the moisture to be compressed and stored together with the CO2. Even after drying, there will still be trace amounts of moisture remaining in the cylinder) is thrown to the breathable plate 92 under the centrifugal force of the turbofan. Because the breathable plate 92 is located on the outside of the circumference and the centrifugal force is the largest, the moisture condenses into water droplets and slides down the inner wall of the nozzle 7 through the air holes. On the one hand, it increases the heat dissipation of the inner cavity of the nozzle 7. On the other hand, the airflow discharged from the breathable plate 92 can take away some welding spatter particles, thereby improving the cleaning effect of the inner cavity of the nozzle 7, reducing the spatter adhesion on the inner wall of the nozzle 7, and reducing the frequency of manual cleaning. It flows along the inner wall of the nozzle 7. During the welding process, when water droplets slide down the inner wall, they evaporate quickly under the action of high temperature. The water vapor generated by evaporation is entrained by the protective gas flowing through and moves to the outlet of the nozzle 7 with the main airflow. The spiral airflow inside the nozzle 7 (driven by the rotation of the heat-conducting tube 9) forms a central high-velocity area (directly above the molten pool) and an edge low-velocity area (near the inner wall of the nozzle 7). Since the density of water vapor is lower than that of the protective gas (Ar density is 1.78kg / m³, CO2 is 1.98kg / m³, and water vapor is only 0.804kg / m³), it will naturally gather in the edge low-velocity area and eventually be discharged along the outer side of the inner wall of the nozzle 7, forming a physical isolation from the protective gas hood around the molten pool. That is, the water vapor has been guided to the periphery of the gas hood before reaching the molten pool and will not invade the molten pool area, thereby not affecting the welding quality.

[0049] The shielding gas forms a focused airflow through diversion and secondary diversion, and forms a conical air hood under the constraint of the inner cavity of the nozzle 7, accurately covering the molten pool and the heat-affected zone, effectively isolating the air, preventing oxidation of the welding area, and ensuring the welding quality; the airflow ejected from the cooling channel 90 and the breathable plate 92 is evenly mixed under the guidance of the conical space at the front end of the nozzle 7, so that the concentration distribution of the shielding gas above the molten pool is more uniform, avoiding weld oxidation due to gas stratification; the heat-conducting tube 9 is in direct contact with the outer wall of the conductive nozzle 81, and the heat of the conductive nozzle 81 is evenly transferred to the heat-conducting tube 9 and the fan blade structure 91, thereby increasing the heat dissipation area, and the airflow accelerates heat dissipation, reducing the temperature of the conductive nozzle 81; the arrangement of the baffle, turbofan, cooling channel 90 and breathable plate 92 prolongs the residence time of the airflow in the nozzle 7, and improves the heat exchange efficiency of the gas per unit time; the rotation of the heat-conducting tube 9 causes the airflow to sweep across the entire surface of the conductive nozzle 81, avoiding local overheating and heat dissipation dead corners.

[0050] Part of the airflow ejected through the nozzle 711 directly acts on the front end of the conductive nozzle 81 through the cooling channel 90, which can take away the heat from the outside of the conductive nozzle 81 and clean the spatter particles adhering to the outside of it; the other part of the airflow flows to the inner wall of the nozzle 7 through the air holes of the air permeable plate 92, and the heat of the baffle and the inner wall of the nozzle 7 is washed away by the airflow, and the spatter particles adhering to the inner wall of the nozzle 7 are cleaned, ensuring uniform output of the protective gas, avoiding particle accumulation causing wire feeding jamming of the welding wire 10, and reducing welding defects.

[0051] The trace moisture in the shielding gas is thrown to the breathable plate 92 under the action of the centrifugal force of the turbofan, condenses into water droplets and slides down the inner wall of the nozzle 7, thereby increasing the heat dissipation of the inner cavity of the nozzle 7 and cooperating with the air flow discharged from the breathable plate 92 to take away some welding spatter particles, thereby improving the cleaning effect and reducing the frequency of manual cleaning; the water vapor generated by the evaporation of the water droplets is entrained by the shielding gas, and naturally gathers to the low flow rate area at the edge due to the density difference, and is finally discharged along the outer side of the inner wall of the nozzle 7, forming a physical isolation with the shielding gas hood around the molten pool, and will not invade the molten pool area and affect the welding quality.

[0052] Example 2, refer to Figure 7-10 The supporting cleaning assembly includes a cleaning brush 713 and multiple groups of scraping arms 93. The cleaning brush 713 is fixedly arranged on the lower side of the positioning platform 71. The scraping arm 93 is fixedly installed on the lower side of the baffle. The scraping arm 93 is composed of a first scraper 931, a second scraper 932 and a connecting ring 933. The top of the connecting ring 933 is fixedly connected to the bottom wall of the baffle. The first scraper 931 and the second scraper 932 are both located on the lower side of the connecting ring 933. The top of the first scraper 931 is fixedly connected to the bottom of the connecting ring 933. The second scraper 932 is fixedly connected to one end of the first scraper 931. When the fan blade structure 91 rotates, the scraping arm 93 rotates accordingly.

[0053] It should be noted that multiple groups of scraping arms 93 are distributed in a circular and equidistant manner around the central axis of the conductive nozzle 81. The first scraper 931 and the second scraper 932 form an "n"-shaped support structure, so that the scraping arm 93 can not only be close to the cleaning surface during rotation, but also remain close to the conductive nozzle 81 to reduce its deformation possibility. The distal side wall of the first scraper 931 is against the inner wall of the nozzle 7. When the first scraper 931 rotates with the heat-conducting tube 9, it can scrape off the flying particles attached to the inner wall of the nozzle 7 in real time to avoid the particles blocking the airflow channel. The inner side wall of the second scraper 932 is against the outer wall of the conductive nozzle 81. When the second scraper 932 rotates, it can sweep across the entire circumference of the conductive nozzle 81, and scrape off the attached metal spatter (especially the area at the front end that is prone to accumulation) in time to prevent the welding wire 10 from being stuck due to spatter agglomeration, ensuring stable burning of the arc. The lower end of the cleaning brush 713 is against the air permeable plate 92. Through the relative movement of the air permeable plate 92 and the cleaning brush 713, the air permeable plate 92 can be effectively cleaned to prevent air flow turbulence caused by blockage of the air holes. The lower end of the first scraper 931 is flush with the lower port of the nozzle 7, which can clean the spatter burrs on the edge of the port and maintain the integrity of the gas hood outlet.

[0054] In this embodiment, when the fan blade structure 91 rotates, the scraper arm 93 is fixedly installed on the lower side of the baffle, so that the scraper arm 93 rotates accordingly. At the same time, the cleaning brush 713 is fixedly set on the lower side of the positioning platform 71. During the operation of the device, the air permeable plate 92 and the cleaning brush 713 produce relative movement. As the air permeable plate 92 and the cleaning brush 713 move relative to each other, the cleaning brush 713 effectively cleans the air permeable plate 92 to prevent air flow turbulence caused by blockage of the air holes.

[0055] The distal side wall of the first scraper 931 abuts against the inner wall of the nozzle 7. During the rotation with the heat-conducting tube 9, the contact with the inner wall of the nozzle 7 is utilized to scrape off the spatter particles attached to the inner wall of the nozzle 7 in real time. The inner side wall of the second scraper 932 abuts against the outer wall of the conductive nozzle 81. During rotation, it can sweep across the entire circumference of the conductive nozzle 81, and promptly scrape off the metal spatter attached to the conductive nozzle 81, especially the spatter in the front end area that is prone to accumulation, to avoid these particles from clogging the airflow channel, to ensure that the protective gas can smoothly pass through the nozzle 7 to form an effective gas hood, to provide good protection for the welding area, and to prevent spatter agglomeration from causing the welding wire 10 to be stuck during feeding, thereby ensuring welding efficiency and quality.

[0056] The first scraper 931 and the second scraper 932 form an "n"-shaped support structure, which allows the scraper arm 93 to be close to the cleaning surface and keep close to the conductive nozzle 81 during rotation, reducing the possibility of deformation of the conductive nozzle 81. The deformation of the conductive nozzle 81 may affect the feeding of the welding wire 10 and the stability of the arc. This structural design ensures the normal working state of the conductive nozzle 81, thereby ensuring the performance of the entire welding device.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0058] In the present invention, unless otherwise expressly specified or limited, terms such as "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0059] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A robot welding machine, comprising a robot body (1), wherein a connecting plate (2) is mounted on the end flange of the robot body (1), a mounting clamp (3) is fixedly mounted on the connecting plate (2), and a welding gun (4) is fixedly clamped in the mounting clamp (3), characterized in that: The welding gun (4) is provided with a curved pipe (5) inside, the lower end of the curved pipe (5) is connected to a diverter (6), the outer side of the diverter (6) is sleeved with an insulating cover (82), the outer side of the diverter (6) is connected to a nozzle (7), the lower end of the diverter (6) is internally connected to a conductive nozzle support (8), the conductive nozzle support (8) is internally connected to a conductive nozzle (81), the conductive nozzle (81) is located inside the nozzle (7), a welding wire (10) is passed through the curved pipe (5), the end of the welding wire (10) passes through the conductive nozzle support (8) and the conductive nozzle (81), a positioning platform (71) is formed inside the nozzle (7), and a plurality of spray holes (711) are opened through the positioning platform (71), and further comprising: A flow-dividing heat-conducting component: the flow-dividing heat-conducting component is arranged inside the nozzle (7); The shunt heat conduction component includes a heat conduction tube (9) and a fan blade structure (91), the top of the heat conduction tube (9) is provided with a limiting platform (901), the inner side of the positioning platform (71) is provided with a limiting groove (712) that matches the limiting platform (901), the heat conduction tube (9) is rotatably connected with the positioning platform (71) through the cooperation of the limiting platform (901) and the limiting groove (712), the fan blade structure (91) is fixed to the lower end of the heat conduction tube (9), the fan blade structure (91) is composed of a turbofan and a baffle, and the lower end of the heat conduction tube (9) is fixedly connected to the baffle. The turbofan is fixed on the baffle, and the outer side of the baffle is fixedly connected with an air-permeable plate (92), and a plurality of cooling channels (90) are provided inside the heat-conducting tube (9), and the plurality of cooling channels (90) are distributed in a circular manner and equidistantly around the central axis of the heat-conducting tube (9), and the upper end of the cooling channel (90) passes through the side wall of the heat-conducting tube (9), and the lower end passes through the bottom wall of the heat-conducting tube (9); there is a gap between the baffle and the inner cavity of the nozzle (7), and the air-permeable plate (92) is provided with air holes, and the outer side of the air-permeable plate (92) is against the inner cavity of the nozzle (7); Support cleaning assembly: the support cleaning assembly is arranged inside the nozzle (7).

2. A robot welding machine according to claim 1, characterized in that: The upper end of the nozzle (7) abuts against the upper end of the insulating cover (82), and a sealing ring is installed at the connection between the nozzle (7) and the insulating cover (82). A gas source interface (51) is provided on one side of the welding gun (4) for receiving protective gas, and the inner end of the gas source interface (51) is communicated with the inner cavity of the elbow (5).

3. The robot welding machine according to claim 1, characterized in that: A plurality of guide holes (61) are provided on the flow diverter (6) below the outer threaded portion of the flow diverter (6), the ends of the guide holes (61) pass through the side wall of the flow diverter (6), an air guide channel (62) is formed between the flow diverter (6) and the inner cavity of the nozzle (7), and the spray hole (711) is arranged toward the end of the nozzle (7).

4. A robot welding machine according to claim 3, characterized in that: A through hole matching the conductive nozzle support (8) and the conductive nozzle (81) is provided in the middle of the positioning platform (71), and a plurality of the guide holes (61) and the spray holes (711) are distributed in an annular manner and at equal intervals along the central axis of the diverter (6).

5. The robot welding machine according to claim 1, characterized in that: The spray hole (711) is arranged opposite to the turbofan, the cooling channel (90) is arranged in multiple sections with an inclination, the upper end of the cooling channel (90) is arranged close to the spray hole (711), the upper end diameter of the cooling channel (90) is larger than the lower end diameter, and the middle part of the cooling channel (90) is in direct contact with the outer side wall of the conductive nozzle (81).

6. The robot welding machine according to claim 1, characterized in that: The heat-conducting tube (9) and the fan blade structure (91) are both made of a high-thermal-conductivity alloy material. The bottom of the air-permeable plate (92) is flush with the bottom of the baffle, and the thickness of the baffle is greater than the thickness of the air-permeable plate (92).

7. The robot welding machine according to claim 1, characterized in that: The supporting cleaning assembly comprises a cleaning brush (713) and a plurality of scraping arms (93), wherein the cleaning brush (713) is fixedly arranged on the lower side of the positioning platform (71), and the scraping arm (93) is fixedly installed on the lower side of the baffle, and the scraping arm (93) is composed of a first scraper (931), a second scraper (932) and a connecting ring (933), wherein the top of the connecting ring (933) is fixedly connected to the bottom wall of the baffle, and the first scraper (931) and the second scraper (932) are both located on the lower side of the connecting ring (933), the top of the first scraper (931) is fixedly connected to the bottom of the connecting ring (933), and the second scraper (932) is fixedly connected to one end of the first scraper (931).

8. The robot welding machine according to claim 7, characterized in that: A plurality of groups of scraper arms (93) are distributed in an annular manner and at equal intervals around the central axis of the conductive nozzle (81); the first scraper (931) and the second scraper (932) form an "n"-shaped support structure; the distal side wall of the first scraper (931) abuts against the inner wall of the nozzle (7); the inner side wall of the second scraper (932) abuts against the outer side wall of the conductive nozzle (81); the lower end of the cleaning brush (713) abuts against the air permeable plate (92); and the lower end of the first scraper (931) is flush with the lower end of the nozzle (7).

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