Auxiliary steam header welding positioning tool

Abstract

The application provides an auxiliary steam header welding positioning tool, which comprises a support, the support is arranged to be capable of sleeving the end portion of a header cylinder, a first supporting rod and a second supporting rod, the first supporting rod and the second supporting rod are arranged on the support, and the first supporting rod and the second supporting rod are respectively located on the two sides of the header cylinder, a supporting assembly, the supporting assembly is arranged between the first supporting rod and the second supporting rod, the supporting assembly is provided with an arc-shaped groove which is matched with the outer circumferential surface of an end cover, the axis of the arc-shaped groove and the axis of the header cylinder coincide with each other, and the arc-shaped groove is used for accommodating and supporting the end cover, and a limiting assembly, the limiting assembly is arranged on the first supporting rod and / or the second supporting rod, and the limiting assembly is arranged to be capable of limiting the end cover, so that the end cover and the header cylinder are axially fixed. The auxiliary steam header welding positioning tool can quickly and accurately position the end cover and is simple to operate, and is helpful to improve the welding efficiency and quality and reduce the labor cost.

Description

Technical Field

[0001] This application relates to the field of steam header welding technology, and more specifically, to an auxiliary steam header welding positioning fixture. Background Technology

[0002] Steam headers, as core pressure-bearing components of power plant boilers and industrial heating systems, play a crucial role in collecting and distributing high-temperature, high-pressure steam. Their structure mainly consists of a header shell, connecting pipes, and end caps. The welding quality of the end caps to the header shell directly affects the equipment's sealing and safety. Traditional welding positioning methods typically involve clamping the end caps with grippers and manually adjusting their position to align them with the shell. However, this method has the following significant drawbacks: 1. Low positioning efficiency: The clamp adjustment process is cumbersome, requiring repeated fine adjustments, which takes a long time and seriously affects the overall welding progress.

[0003] 2. High labor costs: Operation requires the cooperation of many people, especially for large containers, which requires a large investment of manpower and is labor-intensive.

[0004] 3. Difficulty in ensuring accuracy: Relying on manual visual alignment, welding deviations are easily caused by operational errors, affecting sealing performance.

[0005] 4. Insufficient stability: The clamp fixing method is easily affected by vibration during the welding process, which may cause displacement of the end cap, requiring secondary correction.

[0006] Therefore, there is an urgent need for a welding auxiliary tooling that can quickly and accurately position the end caps and is easy to operate, in order to improve welding efficiency and quality and reduce labor costs. Utility Model Content

[0007] This application provides at least one welding auxiliary tooling that can quickly and accurately position the end cap and is easy to operate, so as to improve welding efficiency and quality and reduce labor costs.

[0008] This application provides an auxiliary steam header welding positioning fixture, wherein the steam header includes a header cylinder and end caps, the end caps being welded to both axial ends of the header cylinder, and the fixture includes: A bracket, which is configured to be fitted onto the end of the header cylinder; The first support rod and the second support rod are disposed on the bracket, and the first support rod and the second support rod are respectively located on both sides of the header cylinder; A support assembly is disposed between the first support rod and the second support rod. The support assembly is provided with an arc-shaped groove conforming to the outer peripheral surface of the end cap. The axis of the arc-shaped groove coincides with the axis of the header cylinder. The arc-shaped groove is used to accommodate and support the end cap. A limiting component is disposed on the first support rod and / or the second support rod. The limiting component is configured to limit the end cap so as to fix the end cap and the header cylinder axially.

[0009] In one optional embodiment, the bracket includes a first bracket, a second bracket, a first connecting mechanism, and a second connecting mechanism; Both the first bracket and the second bracket are provided with arc-shaped notches that conform to the outer peripheral surface of the header cylinder. The first bracket and the second bracket are respectively used to be fitted onto both sides of the header cylinder through the arc-shaped notches. The first support rod and the second support rod are respectively provided on the first bracket and the second bracket. The first connecting mechanism and the second connecting mechanism are respectively disposed at both ends of the first bracket and the second bracket. The first connecting mechanism and the second connecting mechanism are used to connect the first bracket and the second bracket into one unit so that the bracket is fixed circumferentially and axially relative to the header cylinder.

[0010] In one optional embodiment, the first bracket has a first slot on the side facing the second bracket, and the second bracket has a first insert block conforming to the first slot on the side facing the first bracket. When the first bracket and the second bracket are connected as one unit, the first insert block is inserted into the first slot.

[0011] In one optional embodiment, both the first connecting mechanism and the second connecting mechanism include a rotating seat, a retaining seat, a pull rod, and a retaining block. The rotating seat is disposed on the first bracket, and the retaining seat is disposed on the second bracket. The retaining seat is provided with a U-shaped groove. One end of the pull rod is connected to the rotating seat, and the pull rod can rotate relative to the rotating seat to enter or exit the U-shaped groove. The retaining block is disposed on the other end of the pull rod, and the retaining block can limit the pull rod when it enters the U-shaped groove by forming a limit with the retaining seat.

[0012] In one optional embodiment, the pull rod is a screw rod, and the locking block is a nut that is threadedly engaged with the screw rod.

[0013] In one optional embodiment, the support assembly includes a first support plate and a second support plate, the first support plate and the second support plate being respectively disposed on the first support rod and the second support rod, the first support plate being provided with a first arc-shaped support portion, the second support plate being provided with a second arc-shaped support portion, and the first arc-shaped support portion and the second arc-shaped support portion forming the arc-shaped groove.

[0014] In one optional embodiment, a second slot is provided on the side of the first arc-shaped support facing the second arc-shaped support, and a second insert block conforming to the second slot is provided on the side of the second arc-shaped support facing the first arc-shaped support. The second insert block is inserted into the second slot so that the first arc-shaped support and the second arc-shaped support are connected.

[0015] In one optional embodiment, the limiting component includes a first limiting component and a second limiting component, the first limiting component and the second limiting component being respectively disposed on the first support rod and the second support rod, and the first limiting component and the second limiting component being used to limit the end cap.

[0016] In one optional embodiment, both the first limiting component and the second limiting component include a limiting slider, a mounting plate, and a driving screw. The limiting slider is disposed on the first support rod / second support rod and is movable relative to the first support rod / second support rod along the axial direction of the end cap. The mounting plate is disposed on the first support rod / second support rod and has a screw hole. The driving screw is disposed in the screw hole and threadedly engaged with the screw hole. One end of the driving screw is connected to the limiting slider, and the driving screw can drive the limiting slider to move by engaging with the screw hole, so that the limiting slider limits the end cap.

[0017] In one optional embodiment, the support is provided with a first level and a second level, which are respectively disposed on the top surface of the support and located on both sides of the header cylinder. One of the first level and the second level is parallel to the axis of the header cylinder, and the other is perpendicular to the axis of the header cylinder.

[0018] The above-mentioned technical solution of this application has the following beneficial technical effects: The auxiliary steam header welding positioning fixture of this application embodiment can be fitted onto the header cylinder and support the end caps, and can ensure that the supported end caps and the header cylinder abut against each other and their axes coincide. Compared with the method of welding positioning using grippers, this fixture can quickly and accurately position the end caps and is easy to operate, which helps to improve welding efficiency and quality and reduce labor costs.

[0019] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. These drawings are incorporated in and constitute a part of this specification. They illustrate embodiments conforming to this application and, together with the specification, serve to explain the technical solutions of this application. It should be understood that the following drawings only show some embodiments of this application and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This illustration shows an installation diagram of an auxiliary steam header welding positioning fixture provided in an embodiment of this application; Figure 2 It shows Figure 1 A magnified view of part A in the image; Figure 3 It shows Figure 1 A magnified view of part B in the image; Figure 4 It shows Figure 1 A diagram from another perspective; Figure 5 It shows Figure 4 A schematic diagram of the installation of the first bracket, the first support rod, and the first support plate; Figure 6 It shows Figure 4 A schematic diagram of the installation of the second bracket, the second support rod, and the second support plate. In the picture: 1. Container body; 2. End cap; 100. Bracket; 110. First bracket; 111. First slot; 112. First level; 120. Second bracket; 121. First insert block; 122. Second level; 130. First connecting mechanism; 140. Second connecting mechanism; 200. First support rod; 201. T-shaped slide; 300. Second support rod; 400. Support assembly; 410. First support plate; 411. First arc-shaped support part; 412. Second slot; 420. Second support plate; 421. Second arc-shaped support part; 422. Second insert block; 500. First limiting assembly; 501. Limiting slider; 502. Mounting plate; 503. Drive screw; 600. Second limiting assembly. Detailed Implementation

[0022] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0023] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0025] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] Steam headers, as core pressure-bearing components of power plant boilers and industrial heating systems, play a crucial role in collecting and distributing high-temperature, high-pressure steam. Their structure mainly consists of a header body, connecting pipes, and end caps. The end caps are welded to both axial ends of the header body, and the welding quality directly affects the equipment's sealing and safety. Traditional welding positioning methods typically involve clamping the end caps with grippers and manually adjusting their position to align them with the header body. However, this method suffers from drawbacks such as low positioning efficiency, high labor costs, difficulty in guaranteeing accuracy, and insufficient stability.

[0028] Based on this, embodiments of this application provide auxiliary steam header welding positioning fixtures. These fixtures can quickly and accurately position the end caps and are easy to operate, which helps to improve welding efficiency and quality and reduce labor costs.

[0029] refer to Figures 1 to 6 The auxiliary steam header welding positioning fixture includes a bracket 100, a first support rod 200, a second support rod 300, a support assembly 400, and a limiting assembly. The bracket 100 is a plate-shaped structure with mounting holes, and is configured to fit (through the mounting holes) onto the end of the header cylinder 1. The first support rod 200 and the second support rod 300 are disposed on the bracket 100, and are located on opposite sides of the header cylinder 1. The support assembly 400 is disposed between the first support rod 200 and the second support rod 300, and has an arc-shaped groove conforming to the outer circumferential surface of the end cap 2. The axis of the arc-shaped groove coincides with the axis of the header cylinder 1, and the arc-shaped groove is used to accommodate and support the end cap 2. The limiting component is provided on the first support rod 200 and / or the second support rod 300. The limiting component is configured to limit the end cap 2 so as to fix the end cap 2 and the header cylinder 1 axially.

[0030] During use, the operator first places the fixture bracket 100 onto the outside of the header cylinder 1, then places the end cap 2 to be welded into the arc-shaped groove of the support component 400. The axis of the end cap 2 located in the arc-shaped groove coincides with the axis of the header cylinder 1. Then, the operator can push the end cap 2 to move it axially until the end of the end cap 2 (welding end) abuts against the end of the header cylinder 1 (welding end). Finally, the operator can operate the limiting component to limit the end cap 2, thereby axially fixing the end cap 2 and the header cylinder 1. After the above operations are completed, the operator can weld the header cylinder 1 and the end cap 2 together.

[0031] refer to Figure 1 and Figure 2In some embodiments, the bracket 100 includes a first bracket 110, a second bracket 120, a first connecting mechanism 130, and a second connecting mechanism 140. Both the first bracket 110 and the second bracket 120 are provided with arc-shaped notches conforming to the outer circumferential surface of the header cylinder 1. The first bracket 110 and the second bracket 120 are respectively used to fit onto both sides of the header cylinder 1 through the arc-shaped notches. A first support rod 200 and a second support rod 300 are respectively disposed on the first bracket 110 and the second bracket 120. The first connecting mechanism 130 and the second connecting mechanism 140 are respectively disposed at both ends of the first bracket 110 and the second bracket 120, and are used to connect the first bracket 110 and the second bracket 120 into a single unit, so that the bracket 100 is fixed circumferentially and axially relative to the header cylinder 1. During use, the first bracket 110 and the second bracket 120 are first fitted onto both sides of the header cylinder 1. Then, the first connecting mechanism 130 and the second connecting mechanism 140 are used to connect the first bracket 110 and the second bracket 120 into one unit, so that the bracket 100 is fixed circumferentially and axially relative to the header cylinder 1, preventing the bracket 100 from moving relative to the header cylinder 1. After the initial spot welding or welding between the header cylinder 1 and the end cap 2 is completed, the operator can disconnect the connection between the first bracket 110 and the second bracket 120 and remove the first bracket 110 and the second bracket 120 from both sides of the header cylinder 1. In this embodiment, the first bracket 110 and the second bracket 120 are respectively fitted onto the left and right sides of the header cylinder 1, and the first connecting mechanism 130 and the second connecting mechanism 140 are located above and below the casing cylinder, respectively.

[0032] In some embodiments, a first slot 111 is provided on the side of the first bracket 110 facing the second bracket 120, and a first insert 121 conforming to the first slot 111 is provided on the side of the second bracket 120 facing the first bracket 110. When the first bracket 110 and the second bracket 120 are connected as a whole, the first insert 121 is inserted into the first slot 111. That is, as the first bracket 110 and the second bracket 120 approach each other from both sides of the header cylinder 1, the first insert 121 can be inserted into the first slot 111. This design ensures accurate positioning of the first bracket 110 and the second bracket 120 and improves the connection stability between the first bracket 110 and the second bracket 120. In this embodiment, there are two first slots 111 and two first inserts 121, respectively located on the upper and lower end faces of the arc-shaped notch of the first bracket 110, and two first inserts 121 located on the upper and lower end faces of the arc-shaped notch of the second bracket 120.

[0033] In some embodiments, the first connecting mechanism 130 includes a rotating seat 131, a retaining seat 132, a pull rod 133, and a retaining block 134. The rotating seat 131 is disposed on the first bracket 110. The retaining seat 132 is disposed on the second bracket 120 and has a U-shaped groove. One end of the pull rod 133 is connected to the rotating seat 131, and the pull rod 133 can rotate relative to the rotating seat 131 to enter or exit the U-shaped groove. The retaining block 134 is disposed on the other end of the pull rod 133 and can limit the pull rod 133 when it enters the U-shaped groove by engaging with the retaining seat 132. During use, after the first bracket 110 and the second bracket 120 approach each other from both sides of the header cylinder 1, and the first insert block 121 is inserted into the first slot 111, the operator can rotate the pull rod 133 so that the end of the pull rod 133 away from the rotating seat 131 enters the U-shaped groove, thereby limiting the locking block 134 and the locking seat 132, and thus connecting the first bracket 110 and the second bracket 120. In this embodiment, the first connecting mechanism 130 and the second connecting mechanism 140 have the same structure, and the first connecting mechanism 130 and the second connecting mechanism 140 are located on the top surface and the bottom surface of the bracket 100, respectively.

[0034] In some embodiments, the pull rod 133 is a screw, and the locking block 134 is a nut that threads with the screw. During use, after the pull rod 133 is screwed into the U-shaped groove, rotating the locking block 134 allows it to move axially along the pull rod 133, adjusting the distance between the locking block 134 and the locking seat 132. This restricts the pull rod 133 from exiting the U-shaped groove, improving the connection effect. In this embodiment, the outer circumferential surface of the locking block 134 is provided with an anti-slip structure, such as raised ridges or anti-slip particles.

[0035] In some embodiments, the support assembly 400 includes a first support plate 410 and a second support plate 420. The first support plate 410 is disposed on the first support rod 200 and has a first arc-shaped support portion 411. The second support plate 420 is disposed on the second support rod 300 and has a second arc-shaped support portion 421. The first arc-shaped support portion 411 and the second arc-shaped support portion 421 form an arc-shaped groove. During use, the first support plate 410 and the second support plate 420 can be pre-installed on the first bracket 110 and the second bracket 120, respectively. When the first bracket 110 and the second bracket 120 approach each other from both sides of the header cylinder 1, the first support plate 410 and the second support plate 420 approach each other synchronously. After the first bracket 110 and the second bracket 120 are connected, the first support plate 410 and the second support plate 420 form an arc-shaped groove. Furthermore, when the first support 110 and the second support 120 move away from each other from both sides of the header cylinder 1, the first pallet 410 and the second pallet 420 move away simultaneously. In this embodiment, both the first arc-shaped support portion 411 and the second arc-shaped support portion 421 are arc-shaped plate structures, and each end of the first arc-shaped support portion 411 and the second arc-shaped support portion 421 away from the axis of the end cap 2 is provided with a connecting portion for connecting with the first support 110 / second support 120.

[0036] In some embodiments, a second slot 412 is provided on the side of the first arc-shaped support portion 411 facing the second arc-shaped support portion 421, and a second insert 422 conforming to the second slot 412 is provided on the side of the second arc-shaped support portion 421 facing the first arc-shaped support portion 411. The second insert 422 is inserted into the second slot 412 to connect the first arc-shaped support portion 411 and the second arc-shaped support portion 421. That is, during installation, the second insert 422 can be inserted into the second slot 412 to connect the first arc-shaped support portion 411 and the second arc-shaped support portion 421. This design can improve the stability of the support assembly 400, prevent the first arc-shaped support portion 411 and the second arc-shaped support portion 421 from deforming under pressure, and avoid the end cap 2 failing to align with the header cylinder 1 due to deformation. In this embodiment, there is one second slot 412 and one second insert 422. The second slot 412 can be inserted into the second insert 422 when the first bracket 110 and the second bracket 120 are close to each other.

[0037] In some embodiments, the limiting assembly includes a first limiting assembly 500 and a second limiting assembly 600, which are respectively disposed on the first support rod 200 and the second support rod 300. The first limiting assembly 500 and the second limiting assembly 600 are used to limit the end cap 2. In use, the first limiting assembly 500 and the second limiting assembly 600 can simultaneously limit both radial ends of the end cap 2, which allows the end cap 2 to be subjected to uniform force and helps to improve stability.

[0038] In some embodiments, the first limiting component 500 includes a limiting slider 501, a mounting plate 502, and a drive screw 503. The limiting slider 501 is disposed in the T-shaped groove 201 of the first support rod 200, and the limiting slider 501 can move relative to the first support rod 200 along the axial direction of the end cap 2 in the T-shaped groove 201. The mounting plate 502 is disposed on the first support rod 200, and the mounting plate 502 is provided with a screw hole. The drive screw 503 is disposed in the screw hole and threadedly engaged with the screw hole. One end of the drive screw 503 is connected to the limiting slider 501, and the drive screw 503 can drive the limiting slider 501 to move by engaging with the screw hole, so that the limiting slider 501 limits the end cap 2. During use, when the end cap 2 is placed on the support assembly 400 and the welded end of the end cap 2 abuts against the welded end of the header cylinder 1, the operator can rotate the drive screw 503, causing the drive screw 503 to drive the limiting slider 501 to move axially along the header cylinder 1, ultimately causing the limiting slider 501 to abut against the end face of the end cap 2, thus achieving limiting. In this embodiment, the second limiting assembly 600 and the first limiting assembly 500 have the same structure.

[0039] In some embodiments, the support 100 is provided with a first level 112 and a second level 122. The first level 112 and the second level 122 are respectively disposed on the top surface of the support 100 and located on both sides of the header cylinder 1. One of the first level 112 and the second level 122 is parallel to the axis of the header cylinder 1, and the other is perpendicular to the axis of the header cylinder 1. During use, when both levels show a horizontal state, it can be quickly determined whether the support 100 is aligned with the axis of the header cylinder 1, avoiding misalignment between the subsequent end cap 2 and the header cylinder 1 due to the tilt of the support 100, thereby ensuring the coaxiality of the welding. In this embodiment, the first level 112 is disposed on the top surface of the first support 110 away from the second support 120 and is perpendicular to the axis of the header cylinder 1. The second level 122 is disposed on the second support 120 away from the first support 110 and is parallel to the axis of the header cylinder 1.

[0040] The auxiliary steam header welding positioning fixture of this application embodiment can be fitted onto the header cylinder and support the end caps, and can ensure that the supported end caps and the header cylinder abut against each other and their axes coincide. Compared with the method of welding positioning using grippers, this fixture can quickly and accurately position the end caps and is easy to operate, which helps to improve welding efficiency and quality and reduce labor costs.

[0041] One or more embodiments in this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this specification should be included within the protection scope of this application.

[0042] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An auxiliary steam header welding positioning fixture, the steam header comprising a header cylinder and end caps, the end caps being welded to both axial ends of the header cylinder, characterized in that, The tooling includes: A bracket, which is configured to be fitted onto the end of the header cylinder; The first support rod and the second support rod are disposed on the bracket, and the first support rod and the second support rod are respectively located on both sides of the header cylinder; A support assembly is disposed between the first support rod and the second support rod. The support assembly is provided with an arc-shaped groove conforming to the outer peripheral surface of the end cap. The axis of the arc-shaped groove coincides with the axis of the header cylinder. The arc-shaped groove is used to accommodate and support the end cap. A limiting component is disposed on the first support rod and / or the second support rod. The limiting component is configured to limit the end cap so as to fix the end cap and the header cylinder axially.

2. The auxiliary steam header welding positioning fixture according to claim 1, characterized in that, The support includes a first support, a second support, a first connecting mechanism, and a second connecting mechanism; Both the first bracket and the second bracket are provided with arc-shaped notches that conform to the outer peripheral surface of the header cylinder. The first bracket and the second bracket are respectively used to be fitted onto both sides of the header cylinder through the arc-shaped notches. The first support rod and the second support rod are respectively provided on the first bracket and the second bracket. The first connecting mechanism and the second connecting mechanism are respectively disposed at both ends of the first bracket and the second bracket. The first connecting mechanism and the second connecting mechanism are used to connect the first bracket and the second bracket into one unit so that the bracket is fixed circumferentially and axially relative to the header cylinder.

3. The auxiliary steam header welding positioning fixture according to claim 2, characterized in that, The first bracket has a first slot on the side facing the second bracket, and the second bracket has a first insert block that conforms to the first slot on the side facing the first bracket. When the first bracket and the second bracket are connected as one unit, the first insert block is inserted into the first slot.

4. The auxiliary steam header welding positioning fixture according to claim 2, characterized in that, Both the first connecting mechanism and the second connecting mechanism include a rotating seat, a retaining seat, a pull rod, and a retaining block. The rotating seat is disposed on the first bracket, and the retaining seat is disposed on the second bracket. The retaining seat is provided with a U-shaped groove. One end of the pull rod is connected to the rotating seat, and the pull rod can rotate relative to the rotating seat to enter or exit the U-shaped groove. The retaining block is disposed on the other end of the pull rod, and the retaining block can limit the pull rod when it enters the U-shaped groove by forming a limit with the retaining seat.

5. The auxiliary steam header welding positioning fixture according to claim 4, characterized in that, The pull rod is a screw rod, and the locking block is a nut that is threadedly engaged with the screw rod.

6. The auxiliary steam header welding positioning fixture according to claim 1, characterized in that, The supporting assembly includes a first support plate and a second support plate, which are respectively disposed on the first support rod and the second support rod. The first support plate is provided with a first arc-shaped supporting part, and the second support plate is provided with a second arc-shaped supporting part. The first arc-shaped supporting part and the second arc-shaped supporting part form the arc-shaped groove.

7. The auxiliary steam header welding positioning fixture according to claim 6, characterized in that, The first arc-shaped support portion has a second slot on the side facing the second arc-shaped support portion, and the second arc-shaped support portion has a second insert block that conforms to the second slot on the side facing the first arc-shaped support portion. The second insert block is inserted into the second slot so that the first arc-shaped support portion and the second arc-shaped support portion are connected.

8. The auxiliary steam header welding positioning fixture according to claim 1, characterized in that, The limiting component includes a first limiting component and a second limiting component, which are respectively disposed on the first support rod and the second support rod, and are used to limit the end cap.

9. The auxiliary steam header welding positioning fixture according to claim 8, characterized in that, Both the first limiting component and the second limiting component include a limiting slider, a mounting plate, and a driving screw. The limiting slider is disposed on the first support rod / second support rod and is capable of moving relative to the first support rod / second support rod along the axial direction of the end cap. The mounting plate is disposed on the first support rod / second support rod and has a screw hole. The driving screw is disposed in the screw hole and threadedly engaged with the screw hole. One end of the driving screw is connected to the limiting slider, and the driving screw can drive the limiting slider to move by engaging with the screw hole, so that the limiting slider limits the end cap.

10. The auxiliary steam header welding positioning fixture according to claim 1, characterized in that, The support is equipped with a first level and a second level. The first level and the second level are respectively disposed on the top surface of the support and located on both sides of the header cylinder. One of the first level and the second level is parallel to the axis of the header cylinder, and the other is perpendicular to the axis of the header cylinder.

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