Connecting pipe stop valve assembly welding tool and welding device

Abstract

The application relates to a connecting pipe stop valve assembly welding tool and a welding device. The connecting pipe stop valve assembly welding tool comprises a welding base, a first fixing assembly, a second fixing assembly and a third fixing assembly are arranged on the welding base; the first fixing assembly and the second fixing assembly are arranged at two ends of a red copper pipe body respectively and are used for fixing a stop valve body and the red copper pipe body; and the third fixing assembly is arranged on one side of the second fixing assembly and is used for fixing a connecting pipe. The scheme can replace the manual holding mode, firmly fix the connecting pipe stop valve assembly on the welding base, effectively reduce the harm caused by electric welding to the workers and the labor intensity of the workers, and effectively solve the problem that the connecting pipe stop valve assembly is caused to fall off due to the centrifugal force of a rotating disc in the welding device when the scheme is applied to the welding device for automatic welding, and the scheme further speeds up the process of automatic production.

Description

Technical Field

[0001] This application relates to the field of welding technology, and in particular to a welding fixture and welding device for a connecting pipe stop valve assembly. Background Technology

[0002] Valves are control components in fluid transport systems, with functions such as shut-off, regulation, flow diversion, backflow prevention, pressure stabilization, flow splitting, or overflow pressure relief. Among them, the gate valve, also called a stop valve, is a forced-seal valve. It is generally produced by welding copper pipe fittings to the gate valve to create a finished connecting pipe gate valve assembly.

[0003] The connecting pipe gate valve assembly includes a gate valve body, a copper pipe body, and a connecting pipe. Currently, in the industry, connecting pipe gate valve assemblies are all welded manually. Specifically, one end of the copper pipe body is first welded to the port on the gate valve body. Then, the other end of the copper pipe body needs to be welded to the connecting pipe. Since the copper pipe body and the gate valve body have a certain weight and length, in actual operation, the welder usually supports and fixes the copper pipe body, the gate valve body, and the connecting pipe by hand while welding the copper pipe body and the connecting pipe together. In this process, because electric welding will generate an electric arc or open flame and local high temperature, dangerous accidents can easily occur. In addition, the dust and toxic gases generated by electric welding can also easily harm human health. Moreover, manual welding is labor-intensive, inefficient, and not conducive to automated production. In related technologies, CN204603655U discloses a gate valve welding device, specifically disclosing a fixing device and a positioning device on the welding plate. However, the fixing device is only used to position the gate valve seat to ensure the assembly depth, while the positioning device is used to ensure the welding angle between the connecting pipe and the valve seat. The technical solution disclosed in the prior art cannot replace manual fixing of the copper pipe body, gate valve body and connecting pipe, reduce the harm caused by electric welding to workers, and when applied to the welding device for automatic welding, it cannot solve the problem of the connecting pipe gate valve assembly falling off due to the centrifugal force of the rotating plate in the welding device, and cannot achieve automated production.

[0004] Therefore, there is an urgent need for a welding fixture and welding device for connecting pipe gate valve components, which can replace manual hand-held welding during the welding process, reduce the harm caused by electric welding to workers, reduce the labor intensity and on-line time of workers, and accelerate the automated production process. Summary of the Invention

[0005] To overcome the problems existing in the related technologies, this application provides a welding fixture and welding device for a connecting pipe stop valve assembly. This welding fixture and welding device can replace manual fixation of the copper pipe body, the stop valve body and the connecting pipe, reduce the harm to workers during the electric welding process and the time spent by workers on the line, and accelerate the automated production process.

[0006] The first aspect of this application provides a welding fixture for a connecting pipe stop valve assembly, including a welding base. The welding base is provided with a first fixing component, a second fixing component, and a third fixing component. The first fixing component and the second fixing component are respectively disposed at both ends of a copper tube body for fixing the stop valve body and the copper tube body. The third fixing component is disposed on one side of the second fixing component for fixing the connecting pipe.

[0007] In one embodiment, the first fixing component includes a sliding connection portion and a clamping portion; the sliding connection portion includes a strip groove, and the sliding connection portion is fixed to the welding base by a screw passing through the strip groove; the clamping portion is connected to the sliding connection portion.

[0008] In one embodiment, the second fixing component includes a U-shaped clamp, the thickness direction of which is perpendicular to the welding base.

[0009] In one embodiment, the third fixing component includes a positioning rod; the positioning rod is disposed at one end of the connecting pipe, and the length direction of the positioning rod is perpendicular to the welding base.

[0010] In one embodiment, a movable component is further included; the movable component is disposed on the welding base; the second fixing component and the third fixing component are disposed on the movable component.

[0011] In one embodiment, the movable component includes a vertically connected lifting column and a lifting plate; the lifting column is vertically disposed on the welding base; the lifting plate includes a lifting positioning hole through which the lifting plate is fitted onto the lifting column.

[0012] In one embodiment, the moving component further includes a positioning plate connected to the lifting plate; and the length direction of the lifting plate is perpendicular to the length direction of the positioning plate; the positioning plate is provided with a strip-shaped groove; the second fixing component and the third fixing component are capable of moving horizontally along the strip-shaped groove.

[0013] In one embodiment, the strip-shaped chute includes a first movable sub-chute, a second movable sub-chute, and a third movable sub-chute; the length direction of the first movable sub-chute is parallel to the length direction of the second movable sub-chute; the length direction of the third movable sub-chute is perpendicular to the length directions of the first movable sub-chute and the second movable sub-chute.

[0014] In one embodiment, it further includes a nitrogen inlet fixing part and a nitrogen filling channel; the nitrogen filling channel is disposed in the nitrogen inlet fixing part; the nitrogen inlet fixing part is provided with a nitrogen filling opening; one end of the nitrogen filling channel is connected to one end of the connecting pipe, and the other end is connected to the nitrogen filling opening.

[0015] A second aspect of this application provides a welding apparatus, including a welding frame, a rotary table, and the aforementioned welding fixture for a connecting pipe shut-off valve assembly; the rotary table is disposed on the welding frame, and the welding fixture for the connecting pipe shut-off valve assembly is disposed on the rotary table.

[0016] The technical solution provided in this application can include the following beneficial effects: When welding the connecting pipe stop valve assembly, the stop valve body and one end of the copper pipe body welded to the stop valve body are fixed to the welding base by the first fixing component; the other end of the copper pipe body is fixed by the second fixing component; and the connecting pipe is fixed by the third fixing component. In this way, the connecting pipe stop valve assembly can be firmly fixed to the welding base through three force points. Compared with the existing method of manually holding the connecting pipe stop valve assembly for welding, the connecting pipe stop valve assembly welding fixture of this application can replace the manual holding method and firmly fix the connecting pipe stop valve assembly to the welding base, effectively reducing the harm caused by electric welding to workers and the labor intensity of workers. Moreover, when it is applied to the welding device for automatic welding, it can also effectively solve the problem of the connecting pipe stop valve assembly falling off due to the centrifugal force of the rotating plate in the welding device, reduce the time for manual line following, and further accelerate the process of automated production.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0019] Figure 1 This is a schematic diagram of the welding fixture for the connecting pipe shut-off valve assembly shown in an embodiment of this application;

[0020] Figure 2This is a schematic diagram of the structure of the first fixing component shown in an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the structure of the second fixing component shown in an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the structure of the third fixing component shown in the embodiments of this application;

[0023] Figure 5 This is another structural schematic diagram of the third fixing component shown in the embodiments of this application;

[0024] Figure 6 This is a schematic diagram of the positioning rod fixing block shown in an embodiment of this application;

[0025] Figure 7 This is a schematic diagram of the structure of the lifting plate shown in the embodiments of this application;

[0026] Figure 8 This is a schematic diagram of the positioning plate shown in an embodiment of this application;

[0027] Figure 9 This is a perspective view of the structure of the nitrogen filling port fixing part shown in the embodiment of this application;

[0028] Figure 10 This is a schematic diagram of the welding apparatus shown in the embodiments of this application.

[0029] Figure label:

[0030] 1. Welding base; 2. First fixing component; 21. Sliding connection part; 211. Strip groove; 22. Clamping part; 221. U-shaped claw; 3. Second fixing component; 31. U-shaped clamping part; 32. Guide hole; 4. Third fixing component; 41. Positioning rod; 42. Positioning rod fixing block; 421. Positioning screw hole; 422. Fixing screw hole; 423. Stabilizing screw hole; 5. Copper tube body; 6. Gate valve body; 7. Connecting pipe; 81. Lifting column; 82. Lifting plate; 821. Lifting positioning hole; 822. Lifting screw hole; 83. Positioning plate; 831. First moving sub-slot; 832. Second moving sub-slot; 833. Third moving sub-slot; 9. Nitrogen filling port fixing part; 91. Nitrogen filling opening; 10. Nitrogen filling channel; 11. Welding frame; 12. Rotary disk; 13. Welding fixture for connecting rod gate valve assembly. Detailed Implementation

[0031] Preferred embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0032] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0033] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0034] Currently, the welding of connecting pipe stop valve assemblies is done manually. Generally, the welder holds and fixes the copper pipe body, the stop valve body, and the connecting pipe by hand while welding the copper pipe body and the connecting pipe together. In this process, because electric welding generates electric arcs or open flames and local high temperatures, dangerous accidents can easily occur. In addition, the dust and toxic gases generated by electric welding can also easily harm human health. Moreover, manual welding is labor-intensive, inefficient, and not conducive to automated production.

[0035] To address the aforementioned issues, this application provides a welding fixture and welding device for a connecting pipe stop valve assembly, which can replace manual fixing of the copper pipe body, stop valve body, and connecting pipe, reducing the hazards to workers during electric welding and the time spent on line work, and accelerating the automated production process.

[0036] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0037] Example 1

[0038] Please see Figures 1-4 , Figure 1This is a schematic diagram of the welding fixture for the connecting pipe shut-off valve assembly shown in an embodiment of this application.

[0039] This application discloses a welding fixture for a connecting pipe stop valve assembly, which includes a welding base 1, on which a first fixing component 2, a second fixing component 3, and a third fixing component 4 are provided.

[0040] The first fixing component 2 and the second fixing component 3 are respectively disposed at both ends of the copper tube body 5 for fixing the shut-off valve body 6 and the copper tube body 5. Specifically, the first fixing component 2 is used to fix the shut-off valve body 6 and one end of the copper tube body 5 welded to the shut-off valve body 6 onto the welding base 1, the second fixing component 3 is used to fix the other end of the copper tube body 5, and the third fixing component 4 is disposed on one side of the second fixing component 3 for fixing the connecting pipe 7.

[0041] Furthermore, such as Figure 2 As shown, the first fixing component 2 includes a sliding connecting part 21 and a clamping part 22 connected to each other. The sliding connecting part 21 includes a strip groove 211, and the sliding connecting part 21 is detachably fixed to the welding base 1 by screws passing through the strip groove 211. In order to enable the clamping part 22 to move in two mutually perpendicular directions to adapt to different lengths of the connecting pipe 7 shut-off valve assembly, the length direction of the strip groove 211 is consistent with the length direction of the sliding connecting part 21, and the length direction of the sliding connecting part 21 is consistent with or perpendicular to the length direction of the clamping part 22. In order to adapt to the shape of the shut-off valve body 6, the clamping part 22 includes a U-shaped block, which is used to abut against both ends of the shut-off valve body 6, so that the shut-off valve body 6 can be snapped into the U-shaped block; a U-shaped claw 221 is provided at the top of one side of the U-shaped block, and the shape and size of the U-shaped claw 221 are adapted to the shape and size of the copper tube 5, and are used to fix one end of the copper tube 5.

[0042] like Figure 3 As shown, the second fixing component 3 includes a U-shaped clamp 31. The thickness direction of the U-shaped clamp 31 is perpendicular to the welding base 1, and the size of the U-shaped clamp 31 is adapted to the size of the copper tube 5. This allows the U-shaped clamp 31 to fix the copper tube 5 while keeping it vertical, further ensuring the precision of the welding process and preventing quality problems caused by errors in the finished product due to the copper tube 5 being skewed.

[0043] like Figure 4As shown, the third fixing component 4 includes a positioning rod 41; the positioning rod 41 is disposed at one end of the connecting pipe 7. During welding, when the copper pipe body 5 is kept vertical under the fixation of the second fixing component 3, the length direction of the positioning rod 41 is perpendicular to the welding base 1, which can better fit the U-shaped connecting pipe 7 and save space.

[0044] It should be noted that the first fixing component 2, the second fixing component 3, and the third fixing component 4 can be adjusted according to the specific structural shape of the shut-off valve assembly of the connecting pipe 7.

[0045] In this first embodiment, when welding the connecting pipe stop valve assembly, the first fixing component secures the stop valve body and one end of the copper pipe to be welded to the stop valve body to the welding base; the second fixing component secures the other end of the copper pipe; and the third fixing component secures the connecting pipe. This allows the connecting pipe stop valve assembly to be firmly fixed to the welding base through three force points. Compared to the existing method of manually holding the connecting pipe stop valve assembly for welding, the welding fixture of this application can replace manual handling, firmly fixing the connecting pipe stop valve assembly to the welding base. This effectively reduces the hazards of electric welding and the labor intensity of manual labor. Furthermore, when applied to an automated welding device, it effectively solves the problem of the connecting pipe stop valve assembly falling off due to the centrifugal force of the rotating disc in the welding device, reducing manual on-line time and further accelerating the process of automated production.

[0046] Example 2

[0047] Because there are many models of connecting pipe stop valve assemblies, this application proposes solutions to address issues such as the need to replace different models or potential quality problems caused by misalignment of the connecting pipe stop valve assembly. Please refer to [link to relevant documentation]. Figures 1-8 Specifically:

[0048] Based on the structure of the above embodiment one, the welding fixture for the connecting pipe stop valve assembly of this application further includes a moving component; the moving component is disposed on the welding base 1; the second fixing component 3 and the third fixing component 4 are disposed on the moving component, and the moving component enables the second fixing component 3 and the third fixing component 4 to move in six directions on the X-axis, Y-axis and Z-axis.

[0049] Specifically, in order to enable the second fixing component 3 and the third fixing component 4 to move along the Z-axis (i.e., the vertical direction), and to provide sufficient space for the welding joint of the shut-off valve assembly of the connecting pipe 7 while adapting to different model requirements, the moving component includes a vertically connected lifting column 81 and a lifting plate 82; the lifting column 81 is vertically set on the welding base 1 and fixed by a bolt assembly; the lifting plate 82 includes a lifting positioning hole 821, through which the lifting plate 82 is sleeved on the lifting column 81, and a lifting screw hole 822 is provided on the side of the lifting plate 82, through which the lifting plate 82 is fixed on the lifting column 81 by a lifting screw; when it is necessary to adjust the height of the lifting plate 82, it is only necessary to loosen the lifting screw to adjust the height of the lifting plate 82, and when the height of the lifting plate 82 is determined, it is only necessary to tighten the lifting screw to fix it.

[0050] To enable the second fixing component 3 and the third fixing component 4 to move along the X-axis and Y-axis (i.e., the horizontal direction), the moving component further includes a positioning plate 83 connected to the lifting plate 82. In order to maximize the use of space, the length direction of the lifting plate 82 is perpendicular to the length direction of the positioning plate 83. The positioning plate 83 is provided with a strip-shaped groove. The second fixing component 3 and the third fixing component 4 can move horizontally along the strip-shaped groove.

[0051] Specifically, the strip-shaped groove includes a first movable sub-groove 831, a second movable sub-groove 832, and a third movable sub-groove 833; the length direction of the first movable sub-groove 831 is parallel to the length direction of the second movable sub-groove 832; the length direction of the third movable sub-groove 833 is perpendicular to the length direction of the first movable sub-groove 831 and the length direction of the second movable sub-groove 832. The second fixing component 3 further includes a guide hole 32, which is disposed on the extended end of the U-shaped clamp 31. The guide hole 32 has an internal thread around its periphery. A matching guide screw passes through the guide hole 32 to fix the second fixing component 3 in the first movable sub-slot 831. The third fixing component 4 further includes a positioning rod fixing block 42, which includes a positioning screw hole 421 and a fixing screw hole 422. One end of the positioning rod 41 is fixed in the positioning screw hole 421. To further stabilize the positioning rod 41, the side of the positioning rod fixing block 42 is also provided with a fixing screw hole 423 at a position opposite to the positioning screw hole 421. A screw adapted to the fixing screw hole 423 is used to fix the second fixing component 3 in the first movable sub-slot 831. The positioning rod 41 is secured to the positioning rod fixing block 42 by a nail; the positioning rod fixing block 42 is fixed in the second moving sub-slot 832 by a fixing screw passing through the fixing screw hole 422. The second fixing component 3 and the third fixing component 4 can move horizontally (i.e., move along the Y-axis) through the first moving sub-slot 831 and the second moving sub-slot 832, respectively; the positioning plate 83 is fixed to the lifting plate 82 by a screw passing through the third moving sub-slot 833. The second fixing component 3 and the third fixing component 4 can move horizontally (i.e., move along the X-axis) by adjusting the position of the positioning plate 83. At the same time, the second fixing component 3 and the third fixing component 4 can move vertically as the lifting plate 82 rises and falls.

[0052] In this embodiment, the lifting plate and lifting column enable the second and third fixed components to move vertically. The first and second moving sub-slots on the positioning plate enable the second and third fixed components to move horizontally (i.e., along the Y-axis), and the third moving sub-slot enables the second and third fixed components to move horizontally (i.e., along the X-axis). This allows for quick adjustment of the positions of the first, second, and third fixed components when different models of connecting pipe shut-off valve assemblies need to be replaced or the position of any one of the fixed components needs to be adjusted. This avoids the problems of high costs due to the need to replace different welding fixtures or poor welding quality due to positional deviations.

[0053] Example 3

[0054] Currently, because the copper pipe body and connecting pipe are made of metallic copper, copper is easily oxidized during welding. The resulting oxides can easily detach and fall into the pipe, causing blockages and reducing the performance of the copper pipe body and connecting pipe. To solve the above problems, this application proposes a corresponding solution. Please refer to [link / reference]. Figures 1-9 Specifically:

[0055] Based on the structure of the above embodiment, the welding fixture for the connecting pipe stop valve assembly of this application further includes a nitrogen filling port fixing part 9 and a nitrogen filling channel 10; the nitrogen filling port fixing part 9 is disposed between the positioning rod 41 and the connecting pipe 7, and the nitrogen filling channel 10 is disposed inside the nitrogen filling port fixing part 9; the nitrogen filling port fixing part 9 is provided with a nitrogen filling opening 91; one end of the nitrogen filling channel 10 is connected to one end of the connecting pipe 7, and the other end is connected to the nitrogen filling opening 91.

[0056] Specifically, the nitrogen filling channel 10 has an L-shaped cross-section. To ensure the airtightness of the nitrogen filling channel 10, prevent nitrogen leakage, and improve the effective utilization rate of nitrogen, the cross-sectional diameter of the nitrogen filling channel 10 is smaller than the diameter of the opening of the connecting pipe 7, so that the nitrogen filling channel 10 can be inserted into the opening of the connecting pipe 7; the diameter of the opening of the connecting pipe 7 is smaller than the cross-sectional diameter of the nitrogen filling port fixing part 9, so that the opening of the connecting pipe 7 can be inserted into the nitrogen filling port fixing part 9.

[0057] In this embodiment, by setting a nitrogen filling port fixing part and a nitrogen filling channel, nitrogen can be filled into the connecting pipe shut-off valve assembly, thereby venting oxygen from the copper pipe body and the connecting pipe, avoiding oxidation of the copper pipe during welding, and ensuring the stability of the performance of the copper pipe body and the connecting pipe.

[0058] Example 4

[0059] Currently, automated production has become a key development direction for various manufacturing enterprises. To reduce labor costs, decrease the workload of high-risk welders, and accelerate the process of automated production, this application also proposes corresponding solutions. Please refer to [link / reference needed]. Figure 1 and Figure 10 Specifically:

[0060] This application also provides a welding apparatus, including a welding frame 11, a rotary disk 12, and the aforementioned welding fixture 13 for the connecting pipe stop valve assembly; the rotary disk 12 is disposed on the welding frame 11, and the welding fixture 13 for the connecting pipe stop valve assembly is disposed on the rotary disk 12.

[0061] To reduce manual on-line time, at least one welding fixture for the connecting pipe stop valve assembly is used. Preferably, there are six welding fixtures for the connecting pipe stop valve assembly, which avoids both overcrowding and wasting space. This allows workers to fix the connecting pipe 7 stop valve assembly onto the welding fixture within a concentrated period and then leave their workstations. The welding device controls the rotating disk 12 to rotate periodically, and in conjunction with the welding gun, the automatic welding of the connecting pipe 7 stop valve assembly can be achieved. To prevent the connecting pipe 7 stop valve assembly from deviating in position due to instability of the center of gravity during the rotation of the rotating disk 12, the welding fixtures for the connecting pipe stop valve assembly are evenly distributed on the rotating disk 12.

[0062] The specific structural features of the welding fixture for the connecting pipe stop valve assembly can be found in the above embodiments, and will not be repeated here.

[0063] In this embodiment, the connecting pipe stop valve assembly is fixed by a welding fixture to prevent it from falling off due to the centrifugal force of the rotating disk. Furthermore, by fixing the welding fixture of the connecting pipe stop valve assembly on a rotating disk that can rotate periodically in conjunction with the welding gun, the automatic welding operation of the connecting pipe stop valve assembly can be realized, effectively reducing labor costs, reducing the workload and on-line time of high-risk welders, and accelerating the process of automated production.

[0064] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated further here.

[0065] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different emphases; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.

[0066] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A welding fixture for a connecting pipe stop valve assembly, comprising a welding base (1), characterized in that, The welding base (1) is provided with a first fixing component (2), a second fixing component (3) and a third fixing component (4); The first fixing component (2) and the second fixing component (3) are respectively disposed at both ends of the copper tube body (5) for fixing the shut-off valve body (6) and the copper tube body (5); the second fixing component (3) includes a U-shaped clamp (31), the thickness direction of which is perpendicular to the welding base (1); The third fixing component (4) is disposed on one side of the second fixing component (3) for fixing the connecting pipe (7); the third fixing component (4) includes a positioning rod (41); the positioning rod (41) is disposed at one end of the connecting pipe (7), and the length direction of the positioning rod (41) is perpendicular to the welding base (1); the third fixing component (4) also includes a positioning rod fixing block (42), the positioning rod fixing block (42) includes a positioning screw hole (421) and a fixing screw hole (422), one end of the positioning rod (41) is fixed in the positioning screw hole (421), and the side of the positioning rod fixing block (42) is also provided with a stabilizing screw hole (423) at a position opposite to the positioning screw hole (421). A movable component; the movable component is disposed on the welding base (1); the second fixing component (3) and the third fixing component (4) are disposed on the movable component; the movable component includes a vertically connected lifting column (81) and a lifting plate (82); the lifting plate (82) includes a lifting positioning hole (821), through which the lifting plate (82) is sleeved on the lifting column (81); the lifting column (81) is vertically disposed on the welding base (1); the movable component also includes a positioning plate (83) connected to the lifting plate (82); and the length direction of the lifting plate (82) is perpendicular to that of the positioning plate. (83) The length directions of the two components are perpendicular to each other; the positioning plate (83) is provided with a strip-shaped groove; the second fixing component (3) and the third fixing component (4) can move horizontally along the strip-shaped groove; the strip-shaped groove includes a first moving sub-groove ( (831)), a second moving sub-groove (832) and a third moving sub-groove (833); the length direction of the first moving sub-groove ( (831)) is parallel to the length direction of the second moving sub-groove (832); the length direction of the third moving sub-groove (833) is perpendicular to the length direction of the first moving sub-groove ( (831)) and the length direction of the second moving sub-groove (832); The positioning rod fixing block (42) is fixed in the second moving sub-slot (832) by fixing screws passing through the fixing screw hole (422). The second fixing component (3) also includes a guide hole (32), which is provided on the extension end of the U-shaped clamp (31). The guide hole (32) is provided with internal threads around its periphery. The second fixing component (3) is fixed in the first moving sub-slot (831) by a matching guide screw passing through the guide hole (32). The horizontal movement of the second fixing component (3) and the third fixing component (4) is realized by the first moving sub-slot (831) and the second moving sub-slot (832), respectively. The first fixing component (2) includes a sliding connection part (21) and a clamping part (22); the sliding connection part (21) includes a strip groove (211), and the sliding connection part (21) is fixed on the welding base (1) by a screw passing through the strip groove (211); the clamping part (22) is connected to the sliding connection part (21).

2. The welding fixture for the connecting pipe shut-off valve assembly according to claim 1, characterized in that, It also includes a nitrogen inlet fixing part (9) and a nitrogen filling channel (10); The nitrogen filling channel (10) is disposed within the nitrogen filling port fixing part (9); The nitrogen filling port fixing part (9) is provided with a nitrogen filling opening (91); One end of the nitrogen filling channel (10) is connected to one end of the connecting pipe (7), and the other end is connected to the nitrogen filling opening (91).

3. A welding apparatus, characterized in that, It includes a welding frame (11), a rotary table (12), and a welding fixture (13) for the connecting pipe shut-off valve assembly as described in any one of claims 1-2; The rotating disk (12) is mounted on the welding frame (11). The welding fixture (13) for the connecting pipe stop valve assembly is mounted on the rotary table (12).

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