Flexible nozzle for self-adaptive narrow gas shielded welding

Abstract

The utility model relates to the field of automatic welding devices, in particular to a flexible nozzle for self-adaptive narrow gas shielded welding. Comprising an annular inner layer and a first fabric layer, the first fabric layer wraps the outer side of the annular inner layer, the outermost end of the first fabric layer exceeds the end of the annular inner layer, and the edge of the outermost end can elastically abut against the narrow side face of the workpiece. A physical space is formed by the annular inner layer and the first fabric layer, protective gas is limited, so that the welding core is always located in the protective gas, meanwhile, the end of the structure can make contact with the narrow face to generate flexible deformation and can generate relative sliding, and the structure can be suitable for narrow-space welding of the nonlinear face.

Description

Technical Field

[0001] The utility model relates to the technical field of automated welding, in particular to a flexible nozzle for self-adaptive narrow-gap gas shielded welding. Background Art

[0002] Gas shielded welding is prone to unstable weld quality issues, as gas flow is affected by a variety of factors, including the environment and the material being welded. This is particularly true in confined spaces. Narrow gap gas shielded welding nozzles are designed to address these issues. Through specialized design, they better control gas flow and provide a stable gas shielding environment, thereby improving welding efficiency and weld quality. The nozzle's adaptability and ease of operation also enhance welding efficiency. To adapt to deep, narrow spaces, these nozzles are designed with a flat shape and are primarily made of hard metals such as copper.

[0003] A search revealed patents with application numbers CN201610181638.9, CN202111668979.6, and CN201610181638.9, all of which disclose primary gas shielding devices for narrow-gap automatic welding. Using these devices as technical references, technicians discovered that these devices require precise setting of the welding torch's swing amplitude and careful avoidance of the walls on both sides of the workpiece, otherwise welding defects or collisions with the welding torch tip can occur.

[0004] However, in many cases, the distance between the two sides of the workpiece is not equal each time it is welded, and the coverage of the welding needs to be increased. If the welding gun swing amplitude is set according to the narrowest point, the welding droplet is not easy to cover in the wider area; if the welding gun swing amplitude is set according to the widest point, the welding gun is likely to touch the workpiece wall in the narrow area, causing welding defects. In order to prevent the welding gun from touching the workpiece, technicians have designed narrow gap adaptive devices such as CN201610152254.4 and CN201510360254.9. However, these devices have complex structures, are difficult to process, are expensive, and are easy to damage. When using the above solutions for welding, it is necessary to prepare image analysis solutions in advance and implement path planning. Such solutions, combined with current image recognition and AI underlying models, require a large amount of data for test simulation and obtain a relatively close test model. When the above costs are combined with time and other factors, the welding efficiency is not as good as that of an experienced worker, especially in the field of non-standard parts.

[0005] Therefore, the present application hopes to improve the structure of the current welding end so that it can meet the above-mentioned requirements for narrow-space welding of non-standard parts, thereby saving a lot of costs. Utility Model Content

[0006] The purpose of the utility model is to provide a flexible nozzle for adaptive narrow-space gas shielded welding to solve the above-mentioned problems existing in the prior art.

[0007] Technical solution: A flexible nozzle for adaptive narrow-gap gas shielded welding, the nozzle comprising a flexible annular inner layer connected to a welding end, and a first fabric layer connected to the welding end;

[0008] The first fabric layer is wrapped around the annular inner layer, and the outer end of the first fabric layer exceeds the outermost end of the annular inner layer.

[0009] In a further embodiment, the annular inner layer comprises:

[0010] A plurality of thin sheets, wherein a plurality of through holes are formed at ends of the thin sheets;

[0011] A metal wire passes through the through hole and is connected to the welding end.

[0012] In a further embodiment, a second fabric layer is provided between the first fabric layer and the annular inner layer, a gap is provided between the second fabric layer and the first fabric layer, and the protective gas passing through the gap forms an annular gas isolation layer.

[0013] In a further embodiment, a second through hole is provided at the other end of the thin sheet, and the two thin sheets are connected end to end through the second through hole.

[0014] In a further embodiment, a third through hole is opened at the side end of the sheet, and the third through hole is in the shape of a horizontal strip. The sheets are combined into an annular structure through the third through hole; the maximum outer diameter of the annular structure is smaller than the first fabric layer.

[0015] In a further embodiment, the first fabric layer is an airtight or densely woven material.

[0016] In a further embodiment, one end of the side surface of the sheet is stepped, and the other end of the side surface of the sheet is adapted to the end.

[0017] In a further embodiment, a transverse cross-section of the sheet is a rectangular surface or an arc-shaped surface.

[0018] In a further embodiment, the cross-section of the end of the welding end is circular, prismatic, or elliptical.

[0019] In a further embodiment, a guide structure is provided at the uppermost end of the sheet to guide the gas to push the sheet outward.

[0020] Beneficial effects

[0021] 1. The outermost end of the nozzle of the present application can flexibly contact the side of the workpiece, and can be better applied to the welding of narrow welds under lower precision requirements while ensuring the strength of the welding.

[0022] 2. The closed air flow channel is composed of two or more layers of flexible heat-resistant materials. The innermost layer close to the welding wire is made of rectangular sheets made of hard high-temperature resistant material, which are strung together by high-temperature resistant metal wires to form a structure similar to armor scales. When in use, when the shielding gas fills the welding space, it can form a flexible physical space that can produce elastic deformation.

[0023] 3. In order to form a more complete gas protection atmosphere at the welding site, two fabric layers are used to make another air flow channel to form an air flow barrier wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of this application.

[0025] Figure 2 It is an exploded schematic diagram of the overall structure of this application.

[0026] Figure 3 It is a schematic diagram of the working structure of this application.

[0027] Figure 4 This is a schematic diagram of the structure of the second solution of this application.

[0028] Figure 5 This is a schematic diagram of the second gas flow scheme of this application.

[0029] Figure 6 This is a schematic diagram of the second annular inner layer structure of this application.

[0030] Figure 7 This is a schematic diagram of the thin-sheet guide structure of this application.

[0031] Figure 8 This is another schematic diagram of the thin film structure of this application.

[0032] Figure 9 This is another schematic diagram of the rectangular ring inner layer structure of the present application.

[0033] Figure 10 This is another schematic diagram of the elliptical ring inner layer structure of the present application.

[0034] The reference numerals in the figure are: welding end 1, annular inner layer 2, first fabric layer 3, second fabric layer 4, thin sheet 5, metal wire 6, workpiece 7, second through hole 8, third through hole 9, and flow guide structure 10. DETAILED DESCRIPTION

[0035] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features known in the art are not described to avoid confusion with the present invention.

[0036] Example 1

[0037] Based on the problems mentioned in the background technology, this application proposes a new solution for welding narrow, irregular, and special workpieces 7. Its core solution is to construct a new semi-enclosed flexible physical area on the traditional shielded welding solution. The edge of this physical area can partially contact and slide with the workpiece 7. By keeping the shielding gas in this physical area, the welding core is not in contact with the air during welding. The advantage of this solution is that the requirements for welding accuracy are reduced. Therefore, for welding operations such as narrow welds and V-shaped welds, conventional welding accuracy and requirements can be controlled without the need for special equipment for debugging and operation, which can effectively save time while ensuring welding strength.

[0038] The present application is a flexible nozzle for adaptive narrow-gap gas shielded welding, comprising an annular inner layer 2 and a first fabric layer 3 attached to or wrapped around the annular inner layer 2. The ends of the annular inner layer 2 and the first fabric layer 3 are respectively connected to the welding end 1. In this combination, the annular inner layer 2 and the first fabric layer 3 form a nearly cylindrical space that is filled with shielding gas, thereby wrapping the welding core and blocking air. The outermost end of the first fabric layer 3 exceeds the bottom of the annular inner layer 2, and the edge of the outermost end can elastically abut against the narrow side of the workpiece 7, or can slide against the narrow side of the workpiece 7. Therefore, during welding, the welding core is always welded in this area and does not contact the side of the weldment.

[0039] The practical optimization solution of this application is that, for example, when conventional welding lateral movement provides an additional weld width of 0.1-0.2 cm, the flexible nozzle can still be used to weld the radial path on the basis of the additional weld width of 0.1-0.2 cm. However, using conventional welding to weld narrow gaps requires a significantly reduced lateral movement distance, resulting in lower weld strength.

[0040] In this solution, the annular inner layer 2 is arranged along the radial direction and has multiple gaps. It can be formed as one piece, or it can be designed according to the following solution. Multiple thin sheets 5 are used, and through holes are opened at the upper ends of the thin sheets 5. Metal wires 6 are passed through the through holes of the thin sheets 5 and connected to the welding end 1. The specific connection method can be to install multiple small pull rings on the welding end 1 and buckle the metal wire 6 on the pull rings, or to connect the metal wire 6 end to end to form a ring, and use a large outer ring to pass through the metal wire 6 ring to fix the appearance on the welding end 1.

[0041] One side of the sheet 5 is rectangular or arc-shaped and is made of a hard, high-temperature resistant material.

[0042] The first fabric layer 3 is an airtight or densely woven material.

[0043] Example 2

[0044] On the basis of Example 1, in order to increase the flexibility of the nozzle end, the present application makes further improvements. The solution is to open a second through hole 8 at the upper and lower ends of the thin film 5, and use a metal wire 6 to pass through the second through hole 8, so that the two thin films 5 can retain a certain relative rotation range. Then, when in use, the annular inner layer 2 itself has at least two degrees of freedom.

[0045] Furthermore, this solution defines a third through hole 9 at the side of the sheet 5. The third through hole 9 is in the form of a horizontal strip, through which the metal wire 6 passes, connecting the sheets 5 into a ring-shaped structure. The maximum outer diameter of the ring structure is smaller than that of the first fabric layer 3. This improvement combines the sheets 5 into a ring structure with a variable inner diameter. The ring structure divides the flow of the protective gas, while the inner flow pushes the ring structure outward, making the ring structure flexible.

[0046] On the basis of the above scheme, one end of the side of the thin sheet 5 is stepped, and the other end of the side of the thin sheet 5 is adapted to the end. The stepped shape in this scheme is one of the structures. The stepped matching structure, combined with the third horizontal through hole 9, can better expand the working space of the welding core.

[0047] Based on the above solution, in order to effectively divert the airflow, this solution also proposes to set a guide structure 10 at the top end of the thin sheet 5 to guide the gas to push the thin sheet 5 outward, so that the welding core is in a flexible physical space.

[0048] Example 3

[0049] Based on Example 1, this solution constructs a second fabric layer 4 between the inner side of the first fabric layer 3 and the annular inner layer 2, so that part of the gas flows through the gap between the second fabric layer 4 and the first fabric layer 3 to form an annular gas isolation layer, so that the welding area is in a better protective gas atmosphere.

[0050] Example 4

[0051] Different from the above solution, the improvement here is to improve the end of the welding end 1, which is improved into a polygonal column structure, or a columnar structure with an elliptical cross section, and then combined with the thin sheet 5 into a corresponding shape, which can be better applied to a variety of special narrow spaces. Figures 9 and 10 As shown, this is an extension scheme. Compared with the cylindrical shielding gas interval, when welding in narrow welds, when the narrow spacing is reduced, this scheme can be extended in another direction through a relatively flat prismatic or elliptical structure, so that the shielding gas interval is smaller than the traditional welding interval. The shielding gas volume in this interval changes less, and the use of this improved nozzle can make little change to the shielding gas release rate, or even no adjustment is required.

[0052] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be interpreted as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. Flexible nozzle for adaptive narrow gap gas shielded welding, characterized by: The nozzle includes a welding end, a flexible annular inner layer connected to the welding end, and a first fabric layer connected to the welding end; The first fabric layer is wrapped around the annular inner layer, and the outer end of the first fabric layer exceeds the outermost end of the annular inner layer.

2. The flexible nozzle for adaptive narrow-gap gas shielded welding according to claim 1, characterized in that: The annular inner layer comprises: A plurality of thin sheets, wherein a plurality of through holes are formed at ends of the thin sheets; A metal wire passes through the through hole and is connected to the welding end.

3. The flexible nozzle for adaptive narrow-gap gas shielded welding according to claim 1, characterized in that: A second fabric layer is provided between the first fabric layer and the annular inner layer. A gap is provided between the second fabric layer and the first fabric layer. The protective gas passing through the gap forms an annular gas isolation layer.

4. The flexible nozzle for adaptive narrow-gap gas shielded welding according to claim 2, characterized in that: A second through hole is formed at the other end of the sheet, and the two sheets are connected end to end through the second through hole.

5. The flexible nozzle for adaptive narrow-gap gas shielded welding according to claim 2, characterized in that: A third through hole is provided at the side end of the sheet, and the third through hole is in the shape of a horizontal strip. The sheets are combined into an annular structure through the third through hole; the maximum outer diameter of the annular structure is smaller than the first fabric layer.

6. The flexible nozzle for adaptive narrow-gap gas shielded welding according to claim 1, characterized in that: The first fabric layer is an airtight or densely woven material.

7. The flexible nozzle for adaptive narrow-gap gas shielded welding according to claim 2, characterized in that: One end of the side surface of the sheet is stepped, and the other end of the side surface of the sheet is matched with the end.

8. The flexible nozzle for adaptive narrow-gap gas shielded welding according to claim 2, characterized in that: A transverse cross section of the sheet is a rectangular surface or an arc surface.

9. The flexible nozzle for adaptive narrow-gap gas shielded welding according to claim 1, characterized in that: The cross section of the end of the welding end is circular, prismatic, or elliptical.

10. The flexible nozzle for adaptive narrow-gap gas shielded welding according to claim 2, characterized in that: A guide structure is provided at the uppermost end of the sheet for guiding the gas to push the sheet outward.

Images