Gas shielded welding conductive nozzle

Abstract

The present invention discloses a gas shielded welding conductive nozzle, which comprises a conductive nozzle body, a gas diffuser arranged at the front end of the conductive nozzle body, and a guide nozzle arranged at the front end of the gas diffuser. A ceramic protector is arranged in the conductive nozzle body and the gas diffuser. The ceramic protector is provided with a core hole for the welding wire to pass through. The welding wire passes through the ceramic protector through the core hole and is led out from the guide nozzle. The gas diffuser is provided with air holes for the shielding gas to pass through. After the shielding gas passes through the air holes, a linear and mutually non-interfering airflow is formed. The airflow surrounds the welding point of the guide nozzle to form a protective atmosphere. The gas shielded welding conductive nozzle of the present invention utilizes a ceramic protector to automatically center the welding wire, reduce wear, isolate heat conduction, and realize continuous welding at high temperature. The gas diffuser is utilized to increase the gas delivery speed and reduce the output pressure of the gas cylinder, effectively improve the utilization rate of carbon dioxide, reduce emissions, and improve welding quality. In addition, the conductive nozzle adopts a split structure, and parts can be replaced as needed to reduce the use and maintenance costs.

Description

Technical Field

[0001] The invention relates to the technical field of gas welding, in particular to a gas shielded welding conductive nozzle. Background Art

[0002] The current gas shielded welding contact nozzle has the following defects:

[0003] 1. If Figure 1 The figure shows the structure of the existing gas shielded welding conductive nozzle. The existing conductive nozzle adopts a radial gas diffuser 410. When the carbon dioxide gas is sprayed, a certain pressure must be reached so that it can be pushed to the welding position of the front conductive nozzle through the inner wall collision reflection. Moreover, the collision between the inner wall collision reflection and the outer wall 420 is likely to form an irregular vortex airflow, and the mutual collision generates airflow resistance, which consumes the conveying speed. Therefore, it is necessary to increase the pressure of the exhaust gas and the working time, thereby increasing the emission of carbon dioxide. In the initial welding, it is also easy to cause the quality failure of the protective weld.

[0004] 2. Currently, the gas shielded welding conductive nozzle is made of red copper or alloy copper. The high temperature generated during continuous welding has no conductor to buffer and absorb heat, which accelerates the softening of the material and causes its service life to plummet.

[0005] 3. At present, the gas shielded welding conductive nozzles on the market are all integrated structures. If the front end is worn, the whole nozzle must be replaced and cannot be replaced separately, resulting in material waste.

[0006] Therefore, the prior art needs to be further developed. Summary of the invention

[0007] In view of the above technical problems, an embodiment of the present invention provides a gas shielded welding conductive nozzle, and its technical solution is as follows.

[0008] A gas shielded welding conductive nozzle, comprising a conductive nozzle body, a gas diffuser arranged at the front end of the conductive nozzle body, and a guide nozzle arranged at the front end of the gas diffuser for leading out welding wire, wherein a ceramic protector is arranged in the conductive nozzle body and in the gas diffuser, and a core hole for the welding wire to pass through is arranged on the ceramic protector, and the welding wire passes through the ceramic protector through the core hole and is led out from the guide nozzle, and an air hole for the shielding gas to pass through is arranged on the gas diffuser, and the shielding gas forms a linear and mutually non-interfering airflow after passing through the air hole, and the airflow surrounds the welding point of the guide nozzle to form a protective atmosphere; the guide nozzle is connected to the The rod is connected to the front end of the gas diffuser, and the rear end of the gas diffuser is connected to the conductive nozzle body. The front end of the gas diffuser is provided with a first connecting pipe for connecting the connecting rod; a sheath is provided around the conductive nozzle, and the sheath is detachably connected to the conductive nozzle body, and a gas diffusion gap is formed between the sheath and the conductive nozzle; the pores of the gas diffuser are provided corresponding to the gas diffusion gaps, and all the pores are symmetrically distributed around the welding wire. Each pore is inclined outward from the air inlet end to the air outlet end relative to the symmetry center, and the pores on the gas diffuser are arranged and distributed in an umbrella shape as a whole, forming an umbrella-shaped multi-porous direct injection structure.

[0009] The gas shielded welding conductive nozzle, wherein the ceramic protector is provided in two, which are respectively provided in the gas diffuser and in the connecting rod.

[0010] The gas shielded welding conductive nozzle, wherein the ceramic protector arranged in the connecting rod is a first ceramic protector, the connecting rod is provided with a receiving groove for fixing the first ceramic protector, the first ceramic protector is arranged in the receiving groove, and the core hole of the first ceramic protector is arranged corresponding to the welding wire through hole on the connecting rod;

[0011] The ceramic protector arranged in the gas diffuser is a second ceramic protector. A connecting groove for connecting the second ceramic protector is arranged in the gas diffuser. A accommodating space corresponding to the second ceramic protector is arranged in the conductive nozzle body. The second ceramic protector is arranged in the gas diffuser along the axial direction of the gas diffuser. The front end of the second ceramic protector is fixedly connected to the connecting groove, and the rear end is located in the accommodating space of the conductive nozzle body. The overall fixation of the second ceramic protector is achieved by riveting the front end of the second ceramic protector to the connecting groove.

[0012] In the gas shielded welding conductive nozzle, the edges of the core holes corresponding to the welding wire entry ends in the first ceramic protector and the second ceramic protector are both provided with guide angles.

[0013] The gas shielded welding conductive nozzle, wherein the air holes of the gas diffuser are arranged in a direction consistent with the direction of the airflow forming the protective atmosphere.

[0014] The gas shielded welding conductive nozzle, wherein the air hole has an inclination angle of 0-20 degrees and an aperture of 0.5-2.0 mm.

[0015] The gas shielded welding conductive nozzle, wherein the gas diffuser is made of plastic or clay that can withstand temperatures of 300-600 degrees Celsius, and the gas diffuser and the conductive nozzle body are integrated by injection molding or ceramic sintering or combined by threaded connection.

[0016] Beneficial effects: The gas shielded welding conductive nozzle of the present invention is provided with a two-stage ceramic protector and a gas diffuser through structural innovation. The ceramic protector can guide the welding wire to the center automatically, which reduces the friction resistance and increases the wear life several times, isolates the heat conduction, solves the problem of insufficient wear resistance of the conductive nozzle in a high temperature environment, and achieves the quality effect of stable wire delivery and continuous welding in a high temperature environment. The gas diffuser adopts a direct injection type to push the gas to eliminate the interference of airflow collision. The gas delivery speed is increased and the output pressure of the gas cylinder is reduced, which effectively improves the utilization rate of carbon dioxide. It has been verified by actual use that it can save 20% of carbon dioxide gas emissions compared with the existing technology; and improves the stability of the weld surface quality. In addition, the gas shielded welding conductive nozzle adopts a split structural design, which can be replaced according to the needs of which parts are damaged, thereby increasing the maximum service life of single parts and reducing the cost of use and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an existing gas shielded welding conductive nozzle;

[0018] Figure 2 It is a schematic diagram of the structure of a gas shielded welding contact nozzle in a specific embodiment of the present invention;

[0019] Figure 3 It is a schematic structural diagram of a gas shielded welding conductive nozzle in another specific embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0021] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more centered elements can exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more centered elements can exist between them. The terms "vertical", "horizontal", "left", "right", "upper", "lower", "inner", "outer", "bottom", etc. used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is 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 cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used in this specification and in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] like Figure 2 and Figure 3 A gas shielded welding conductive nozzle is shown, which includes a conductive nozzle body 100, a gas diffuser 160 arranged at the front end of the conductive nozzle body, and a guide nozzle 110 arranged at the front end of the gas diffuser 160 for leading out a welding wire 300. A ceramic protector is arranged in the conductive nozzle body and the gas diffuser. The ceramic protector is provided with a core hole for the welding wire to pass through. The welding wire passes through the ceramic protector through the core hole and is led out from the guide nozzle. The gas diffuser is provided with air holes for the shielding gas to pass through. After passing through the air holes, the shielding gas forms a linear and mutually non-interfering airflow, and the airflow surrounds the welding point of the guide nozzle to form a protective atmosphere.

[0024] Specifically, the guide nozzle 110 is connected to the front end of the gas diffuser 160 through the connecting rod 120, the rear end of the gas diffuser is connected to the conductive nozzle body, the front end of the gas diffuser is provided with a first connecting pipe 130 for connecting the connecting rod, a welding wire through hole is provided in the connecting rod, and a welding wire through hole is provided in the center of the gas diffuser. The welding wire enters the guide nozzle after passing through the conductive nozzle body, the gas diffuser and the welding wire through holes in the connecting rod, and extends out from the front end of the guide nozzle.

[0025] In a preferred embodiment, the ceramic protector is provided in plurality and the plurality of ceramic protectors are distributed in the conductive nozzle along the axial direction of the welding wire. The plurality of ceramic protectors respectively guide and fix the welding wires at different positions, and the ceramic protectors have a low friction coefficient, thereby reducing the wear of the welding wire.

[0026] Furthermore, the ceramic protector is provided in two pieces, one in the connecting rod and the other in the gas diffuser. Specifically, the ceramic protector provided in the connecting rod is the first ceramic protector 210, the first ceramic protector is provided in the receiving groove, and the core hole of the first ceramic protector is provided correspondingly to the welding wire through hole on the connecting rod.

[0027] The ceramic protector arranged in the gas diffuser is the second ceramic protector 220. The gas diffuser is provided with a connecting groove for connecting the second ceramic protector. A accommodating space corresponding to the second ceramic protector is provided in the conductive nozzle body. The second ceramic protector is arranged in the gas diffuser along the axial direction of the gas diffuser. The front end of the second ceramic protector is fixedly connected to the connecting groove, and the rear end is located in the accommodating space of the conductive nozzle body. The overall fixation of the second ceramic protector is achieved by riveting the front end of the second ceramic protector to the connecting groove.

[0028] The double ceramic protector can make the conductive nozzle form a new structural mode of concentricity stability of two points in one line. The setting of the first ceramic protector and the second ceramic protector can guide the welding wire to the center, reduce the friction between the welding wire and the conductive nozzle body, and reduce the range of welding wire jump to improve the appearance quality of the weld. During the welding process, the position where the welding wire is led out of the nozzle is a high-temperature, high-speed wear and high-speed zone. Due to wear (damage) or high temperature, fusion or hole deformation and enlargement occur, thereby affecting the use. The ceramic protector itself has the characteristics of high temperature resistance, high temperature isolation, high hardness wear resistance, corrosion resistance, insulation, etc. The ceramic protector plays a role in guiding the welding wire and also plays a buffering role, preventing the high temperature from conducting heat to the conductive nozzle body, reducing the wear of the conductive nozzle body under high temperature conditions, thereby extending the service life of the conductive nozzle. The conductive nozzle can be continuously welded in a high current and high temperature environment. The ceramic protector has long-lasting stability and wear resistance in a long-term high temperature environment. This feature solves the problem of insufficient wear resistance of the conductive nozzle in a high temperature environment. The conductive nozzle of the present invention has been verified by actual use, and its service life is 4-6 times longer than that of the conductive nozzle of the existing technology in the market.

[0029] The ceramic protector can be used at a high temperature of 1700℃ for a long time. Compared with metal, it has excellent properties such as high hardness, high strength, high temperature resistance (refractory), wear resistance, corrosion resistance, acid and alkali resistance, oxidation resistance, insulation, non-magnetic, and good chemical stability. The material advantage of the ceramic protector makes the operating temperature of the conductive nozzle of the present invention 2.5 times higher than the 650-degree operating temperature of the conductive nozzle of the copper body and stainless steel body in the prior art. The wear resistance is 7-9 times that of the conductive nozzle of the copper body and stainless steel body.

[0030] Specifically, the edges of the core holes corresponding to the welding wire entry ends in the conductive tip body and the ceramic protector in the connecting rod are both provided with guide angles, and the setting of the guide angles enables the welding wire to pass through the ceramic protector smoothly.

[0031] In another preferred embodiment, the ceramic protector is formed by electroplating ceramic and brushing ceramic on the corresponding positions of the conductive tip body and the connecting rod. That is, the ceramic protector is not a single part, and the ceramic protective layer is formed by electroplating or brushing ceramic in the conductive tip to achieve the function of the ceramic protector.

[0032] Furthermore, a sheath 140 is provided around the guide nozzle, and the sheath is detachably connected to the conductive nozzle body, wherein a second connecting pipe 150 is provided on the conductive nozzle body, and the sheath is connected to the conductive nozzle body through the second connecting pipe. The service life of the sheath, the guide nozzle, and the connecting rod is different. The split structure of the conductive nozzle of the present invention can achieve the technical effect of replacing only damaged parts without replacing the entire part, thereby increasing the maximum service life of single product parts and reducing the use and maintenance costs.

[0033] Furthermore, a gas diffusion gap is formed between the sheath and the guide nozzle of the gas shielded welding conductive nozzle, and a gas diffuser 160 corresponding to the gas diffusion gap is provided at the front end of the conductive nozzle body, and a plurality of air holes 161 for exporting carbon dioxide to the gas diffusion gap are provided on the gas diffuser, and the protective gas forms a linear and mutually non-interfering airflow after passing through the air holes, and the airflow surrounds the welding point of the guide nozzle to form a protective atmosphere. Furthermore, the angle between the air holes of the gas diffuser and the airflow direction forming the protective atmosphere is less than 90 degrees, wherein all the air holes are centrally symmetrically distributed around the welding wire, and each air hole is tilted outward from the air inlet end to the air outlet end relative to the symmetry center, so that the air holes on the gas diffuser are arranged and distributed in an umbrella shape as a whole. The overall umbrella-shaped distribution of the air holes on the gas diffuser enables the air holes to directly spray and push the gas, reducing the gas output resistance and the gas delivery speed, thereby reducing the output pressure of the gas cylinder, effectively improving the utilization rate of carbon dioxide, thereby reducing the welding cost, and greatly reducing the emission of carbon dioxide into the atmosphere. Actual use verification shows that the emission of carbon dioxide gas can be saved by 20% compared with the existing technology.

[0034] The gas diffuser of the present invention greatly reduces the situation where the airflows interfere with each other to form vortices, and can smoothly push the push gas to the working area, such as Figure 3As shown by the arrow in the middle airflow direction, the umbrella-shaped air hole arrangement of the gas diffuser of the present invention makes the carbon dioxide flow more smoothly in the sheath, eliminating the situation where the airflows interfere with each other to form vortices. The stable and smooth airflow also greatly reduces the impact of the carbon dioxide airflow on the ripples of the molten iron in the weld pool, thereby effectively improving the welding quality of the weld. At the same time, the air hole pushes the gas in the umbrella-shaped layout of the gas diffuser of the present invention and pushes it at high speed along the inner wall, so that the protection weld will not fail in the initial state.

[0035] In a preferred embodiment, the pore inclination angle is 0-20 degrees, and the aperture is 0.5-2.0 mm. The number of pores is 4-8. Preferably, the gas diffuser can arrange the pores in an umbrella-shaped arrangement of 5-7 holes, and the pore inclination angle is set to 10 degrees. The arrangement of the pores in an umbrella-shaped arrangement of 5-7 holes can make the overlap of the airflow of adjacent pores less than 10%, and on the premise of forming a sufficient and complete protective atmosphere, the mutual interference between the pores is minimized, so that the carbon dioxide gas flow through the gas protector is the smoothest, the interference vortex generated is also the least, and the pressure required for the gas cylinder to output carbon dioxide is also the smallest. Of course, the utilization efficiency of carbon dioxide is also the highest, and the amount of carbon dioxide discharged to the atmosphere can also be minimized. Actual use verification shows that the gas cylinder pressure and flow rate can be adjusted 30% lower than the existing technology, and the carbon dioxide emissions to the atmosphere can be reduced by 20% compared with the existing technology. According to the calculation of China's carbon dioxide emissions of 1 billion tons in 2017 and the national annual carbon dioxide welding usage of 50 million tons, it can save tens of millions of tons of carbon dioxide emissions each year. Thereby achieving huge economic and social benefits.

[0036] Furthermore, the gas diffuser is made of insulating materials such as plastic or ceramics that can withstand temperatures of 300-600 degrees Celsius, and the gas diffuser is combined with the conductive nozzle body by injection molding or threaded connection.

[0037] The gas shielded welding conductive nozzle of the present invention is provided with a ceramic protector and a gas diffuser through structural innovation. The ceramic protector can guide the welding wire to automatically center, reduce friction, isolate heat conduction, solve the problem of insufficient wear resistance of the conductive nozzle in a high temperature environment, and achieve the effect of continuous welding in a high temperature environment. The gas diffuser adopts a direct injection type to push gas, eliminate the interference of airflow collision, increase the gas delivery speed, reduce the output pressure of the gas cylinder, effectively improve the utilization rate of carbon dioxide, and reduce its emission accordingly. The surface quality of the weld is improved. In addition, the gas shielded welding conductive nozzle adopts a split structural design, and parts can be replaced as needed, which increases the maximum service life of single parts and reduces the cost of use and maintenance.

[0038] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and concept of the present invention, and all these changes or substitutions should fall within the protection scope of the claims attached to the present invention.

Claims

1. A gas shielded welding contact nozzle, characterized in that: The invention comprises a conductive nozzle body, a gas diffuser arranged at the front end of the conductive nozzle body, and a guide nozzle arranged at the front end of the gas diffuser for leading out the welding wire. A ceramic protector is arranged in the conductive nozzle body and the gas diffuser. A core hole for the welding wire to pass through is arranged on the ceramic protector. The welding wire passes through the ceramic protector through the core hole and is led out from the guide nozzle. The gas diffuser is provided with air holes for the shielding gas to pass through. After the shielding gas passes through the air holes, a linear airflow without mutual interference is formed. The airflow surrounds the welding point of the guide nozzle to form a protective atmosphere. The guide nozzle is connected to the front end of the gas diffuser through a connecting rod, the rear end of the gas diffuser is connected to the conductive nozzle body, and the front end of the gas diffuser is provided with a first connecting pipe for connecting the connecting rod; A sheath is arranged around the conductive nozzle, and the sheath is detachably connected to the conductive nozzle body, and a gas diffusion gap is formed between the sheath and the conductive nozzle; The pores of the gas diffuser are arranged corresponding to the gas diffusion gaps, and all the pores are symmetrically distributed around the welding wire. Each pore is inclined outward relative to the symmetry center from the air inlet end to the air outlet end. The pores on the gas diffuser are arranged in an umbrella shape as a whole, forming an umbrella-shaped multi-porous direct injection structure.

2. The gas shielded welding contact nozzle according to claim 1, characterized in that: The ceramic protectors are provided in two pieces, which are respectively arranged in the gas diffuser and in the connecting rod.

3. The gas shielded welding contact tip according to claim 2, characterized in that: The ceramic protector disposed in the connecting rod is a first ceramic protector, a receiving groove for fixing the first ceramic protector is disposed in the connecting rod, the first ceramic protector is disposed in the receiving groove, and a core hole of the first ceramic protector is disposed correspondingly to a welding wire through hole on the connecting rod; The ceramic protector arranged in the gas diffuser is a second ceramic protector. A connecting groove for connecting the second ceramic protector is arranged in the gas diffuser. A accommodating space corresponding to the second ceramic protector is arranged in the conductive nozzle body. The second ceramic protector is arranged in the gas diffuser along the axial direction of the gas diffuser. The front end of the second ceramic protector is fixedly connected to the connecting groove, and the rear end is located in the accommodating space of the conductive nozzle body. The overall fixation of the second ceramic protector is achieved by riveting the front end of the second ceramic protector to the connecting groove.

4. The gas shielded welding contact tip according to claim 3, characterized in that: The edges of the core holes of the first ceramic protector and the second ceramic protector corresponding to the welding wire entry ends are both provided with guide angles.

5. The gas shielded welding contact tip according to claim 1, characterized in that: The air holes of the gas diffuser are arranged in a direction consistent with the air flow direction for forming the protective atmosphere.

6. The gas shielded welding contact tip according to claim 1, characterized in that: The inclination angle of the pores is 0-20 degrees, the pore diameter is 0.5-2.0 mm, and the number of pores is 4-8.

7. The gas shielded welding contact tip according to claim 1, characterized in that: The gas diffuser is made of plastic or pottery resistant to temperatures of 300-600 degrees Celsius, and the gas diffuser is integrated with the conductive nozzle body through injection molding or ceramic sintering or combined through threaded connection.

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