A multi-station welding fixture

Abstract

The utility model relates to pipeline processing technical field provides a kind of multi-station welding fixture, for realizing the step-by-step welding of multiple fittings on elbow pipe, the flange of two ends of elbow pipe needs to be welded, connecting piece needs to be welded on the lateral wall of elbow pipe, multi-station welding fixture includes: workbench, support plate is arranged thereon;Support plate is provided with first fixed station, second fixed station, third fixed station and fourth fixed station;First fixed station is used to fix elbow pipe and one of flange;Second fixed station is used to fix elbow pipe after completing the preliminary welding of one end portion;Third fixed station is used to fix elbow pipe, another flange and connecting piece;Fourth fixed station is used to fix elbow pipe after completing the welding of another end portion and lateral wall;Each station is equipped with unified reference positioning system, ensure that flange and elbow pipe concentric, connecting piece angle of fit is accurate, standardization clamping eliminates artificial difference, guarantee weld formation consistency and assembly accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline processing technology, specifically relating to a multi-station welding fixture. Background Technology

[0002] In the manufacturing process of pipeline systems (such as industrial pipeline systems, fluid transmission systems, etc.), the connection welding of pipes and flanges, as well as the positioning welding of pipes and fittings, are key processes to ensure the assembly accuracy, sealing performance and structural stability of the pipeline.

[0003] For multi-component welding such as "pipe-flange-connector" (usually the butt welding of the pipe and flange is completed first, and then the fillet welding or lap welding of the connector is carried out), some production scenarios still rely on manual operation.

[0004] In manual operation scenarios, the relative positions of workpieces (including pipes, flanges, and connectors) rely entirely on manual alignment and temporary fixation by the operator. During welding, thermal deformation caused by the arc heat input and the release of welding stress can easily lead to workpiece displacement or vibration, resulting in: misalignment between the flange and pipe axis, tilting of the sealing surface after welding; and deviation of the connector's contact surface from the design angle, affecting subsequent assembly and load-bearing performance.

[0005] Furthermore, due to differences in operating habits and force application methods among different operators, it is difficult to guarantee the consistency of weld position, height, and formation even when the same person performs repeated operations. This not only affects the appearance quality but may also lead to defects such as insufficient weld penetration and undercut, thereby reducing the sealing reliability and structural strength of the joint.

[0006] The aforementioned problems make it difficult to guarantee the geometric accuracy and quality stability of welded components, resulting in a low yield rate. A large number of workpieces need to be reworked (such as repair welding and grinding), and in severe cases, they may even be scrapped, causing significant waste of materials and time.

[0007] Meanwhile, welding quality is highly dependent on the experience and skills of the operators. Novices, lacking precise alignment and process control capabilities, are more prone to welding deviations when operating without fixtures, further exacerbating quality fluctuations. Therefore, traditional manual welding not only has high production barriers but also hinders standardization and efficiency improvements in small-batch production. Utility Model Content

[0008] To address the aforementioned shortcomings of existing technologies, the technical problem this invention aims to solve is to propose a multi-station welding fixture. By setting up a first, second, third, and fourth fixed station on a support plate, the welding process of multiple pipeline components is decomposed into four stages: preliminary welding, reinforcement welding, assembly welding, and secondary reinforcement, forming an assembly line-like operation. Each station is equipped with a unified reference positioning system, effectively suppressing thermal deformation and welding vibration, ensuring concentricity between the flange and the pipeline, accurate fitting angles of the connecting parts, and avoiding tilting of the sealing surface and stress concentration. Standardized clamping eliminates human error, ensuring consistent weld formation and assembly accuracy.

[0009] The technical solution adopted by this utility model to solve its technical problem is to propose a multi-station welding fixture for step-by-step welding of multiple fittings on a pipeline, wherein flanges need to be welded to both ends of the pipeline, and connecting parts need to be welded to the side wall of the pipeline. The multi-station welding fixture includes:

[0010] A workbench with a support plate on it;

[0011] The first fixed station, which is set on the support plate, is used to fix the pipe and one of the flanges for preliminary welding of one end of the pipe;

[0012] The second fixed station is located to the side of the first fixed station and is used to fix the pipe after the initial welding of one end is completed, so as to reinforce the corresponding weld.

[0013] The third fixed station is located to the side of the second fixed station and is used to fix the pipe, another flange and the connector for welding the other end and sidewall.

[0014] The fourth fixed station is located to the side of the third fixed station and is used to fix the pipe after the welding of the other end and the side wall is completed, so as to reinforce the corresponding weld.

[0015] The installation posture 6 of the pipeline is different at the first fixed station, the second fixed station, the third fixed station, and the fourth fixed station to adapt to the positioning requirements of different welding positions.

[0016] In the aforementioned multi-station welding fixture, a first fixing component is provided on both the first fixed station and the third fixed station.

[0017] In the aforementioned multi-station welding fixture, the flange has a center hole and a threaded hole, and the first fixing assembly includes:

[0018] A first support block is fixedly mounted on the support plate. The first support block is provided with a first positioning post and a second positioning post. The first positioning post is inserted into the central hole, and the second positioning post is inserted into the threaded hole, which are used to provide support and positioning for the flange to be welded.

[0019] The second support block, which is liftable and mounted on the support plate and located to the side of the first support block, is used to provide support for the pipe.

[0020] A clamping block is movably disposed above the second support block and abuts against the pipe placed on the second support block to fix the pipe.

[0021] A first driving component is connected below the support plate, and a second support block is connected to the output end of the first driving component. The first driving component is used to drive the second support block to rise and fall.

[0022] A second driving member is connected to the support plate, and the clamping block is connected to the output end of the second driving member. The second driving member is used to drive the clamping block to move.

[0023] In the aforementioned multi-station welding fixture, the connector has a through hole extending along its thickness direction, and the first fixing component further includes:

[0024] A movable seat, which is movably mounted on the support plate;

[0025] A third support block is connected to the movable seat. The third support block is provided with a third positioning post, which is inserted into the through hole to provide support and positioning for the connector to be welded.

[0026] A positioning block is disposed on the support plate and is positioned opposite to the third support block. One side of the pipe is in contact with the positioning block, and the other side is in contact with the connector placed on the third support block.

[0027] A fixing washer is provided, wherein the second support block has a placement groove, the fixing washer is sleeved on the pipe and snapped into the placement groove, for providing radial limiting of the pipe;

[0028] Two fourth support blocks are respectively set on the support plate. Each of the two fourth support blocks is provided with a positioning pin. The positioning blocks have positioning holes on both sides, and the positioning holes are fitted onto the positioning pins.

[0029] A third driving component is connected below the support plate, and its output end is connected to the movable seat to drive the movable seat to move.

[0030] In the aforementioned multi-station welding fixture, the movable seat is provided with a first abutting part and a second abutting part. The first abutting part abuts against the positioning block provided on the fourth support block to enhance its installation stability. The second abutting part abuts against the fixing washer sleeved on the pipe to fix the fixing washer.

[0031] In the aforementioned multi-station welding fixture, the positioning block has a support arm and a positioning groove located in its middle position, the positioning groove being in contact with the outer circumferential surface of the pipe.

[0032] In the aforementioned multi-station welding fixture, both the second fixed station and the fourth fixed station are equipped with second fixing components for fixing the pipe that has completed preliminary welding and requires weld reinforcement.

[0033] In the aforementioned multi-station welding fixture, the second fixing component includes:

[0034] The fifth support block is mounted on the support plate, and the fifth support block is provided with a fourth positioning post, which is inserted into the threaded hole of the flange to provide support.

[0035] A fixing rod is mounted on the support plate. One end of the fixing rod is connected to a fixing member. The fixing member has a snap-fit ​​groove, which snaps onto the pipe and is locked with bolts to fix the pipe.

[0036] In the aforementioned multi-station welding fixture, an adjustment component is also provided on the worktable. One side of the support plate is connected to the worktable via the adjustment component, and the adjustment component is used to adjust the height of the support plate connected to the worktable.

[0037] In the aforementioned multi-station welding fixture, the adjustment component includes:

[0038] A connecting seat, which is fixedly mounted on the workbench;

[0039] An adjusting screw has one end connected to the connecting seat and the other end passing through the support plate. Two locking nuts are respectively pressed against both sides of the support plate in the thickness direction and threaded onto the adjusting screw, which is used to lock the height position of one side of the support plate connected to the worktable.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) By setting up the first, second, third, and fourth fixed stations on the support plate, the multi-component welding process of the pipeline is decomposed into four stages: "preliminary welding, reinforcement welding, assembly welding, and secondary reinforcement," forming an assembly line-style operation process. Each station is equipped with a unified reference positioning system, which effectively suppresses thermal deformation and welding vibration, ensures that the flange and pipeline are concentric, the fitting angle of the connecting parts is accurate, and avoids the tilting of the sealing surface and stress concentration. Standardized clamping eliminates human differences and ensures the consistency of weld formation and assembly accuracy.

[0042] (2) The first fixing component enables high-precision coordinated positioning and reliable clamping of the pipe, flange, and connector. The first and second positioning pins on the first support block are inserted into the center hole and threaded hole of the flange, respectively, to achieve stable flange positioning. The second support block, in conjunction with the clamping block, provides vertical support and clamping for the pipe. The third positioning pin on the third support block is inserted into the through hole of the connector to achieve its spatial positioning. Driven by the third driving component, the moving seat precisely positions the connector, ensuring a tight fit and accurate angle between the pipe and connector, in conjunction with the positioning block and fixing washer. This structure offers high positioning accuracy and stable clamping, making it suitable for welding scenarios involving multiple components, significantly improving welding consistency and production efficiency.

[0043] (3) The second fixing component is specifically designed for repositioning and clamping the pipe assembly that has completed the initial welding for weld reinforcement. The fourth positioning pin on the fifth support block is inserted into the threaded hole of the welded flange to achieve a positioning reference consistent with the initial welding position and ensure coaxiality; the fixing part at the end of the fixing rod covers the outer wall of the pipe through the snap-fit ​​groove and is locked by bolts to achieve fast and stable clamping. Attached Figure Description

[0044] Figure 1 This is a 3D view of the pipes that have been welded in this project.

[0045] Figure 2 This is a 3D view of the proposed solution.

[0046] Figure 3 yes Figure 2 A 3D view of the hidden part of the structure.

[0047] Figure 4 This is a 3D view of the first fixed component in this scheme.

[0048] Figure 5 yes Figure 2 A 3D view of the first fixed component hidden in the middle.

[0049] In the diagram, 1. Pipe; 2. Flange; 3. Connector; 4. Center hole; 5. Threaded hole; 6. Through hole; 7. Workbench; 8. Support plate; 9. First fixed station; 10. Second fixed station; 11. Third fixed station; 12. Fourth fixed station; 13. First fixed assembly; 14. First support block; 15. First positioning post; 16. Second positioning post; 17. Second support block; 18. Clamping block; 19. First driving component; 20. Second driving component; 21. Moving seat; 22. Third... 23. Support block; 24. Third positioning pin; 25. Positioning block; 26. Fixing washer; 27. Fourth support block; 28. Positioning pin; 29. ​​Third driving component; 30. First abutment part; 31. Second abutment part; 32. Support arm; 33. Positioning groove; 34. Second fixing component; 35. Fifth support block; 36. Fourth positioning pin; 37. Fixing rod; 38. Snap-fit ​​groove; 39. Bolt; 40. Adjusting component; 41. Connecting seat; 42. Adjusting screw; 43. Locking nut. Detailed Implementation

[0050] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0051] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0052] like Figures 1 to 5As shown, this solution provides a multi-station welding fixture for the step-by-step welding of multiple fittings on a pipe 1. Flanges 2 need to be welded to both ends of the pipe 1, and connectors 3 need to be welded to the sidewalls of the pipe 1. The multi-station welding fixture includes: a workbench 7 with a support plate 8 mounted on it; a first fixed station 9, mounted on the support plate 8, for fixing the pipe 1 and one of the flanges 2 to perform preliminary welding at one end of the pipe 1; a second fixed station 10, located to the side of the first fixed station 9, for fixing the pipe 1 after the preliminary welding at one end is completed, to reinforce the corresponding weld; and a third... Fixed station 11, located to the side of the second fixed station 10, is used to fix pipe 1, another flange 2, and connector 3 for welding the other end and sidewall; fourth fixed station 12, located to the side of the third fixed station 11, is used to fix pipe 1 after welding the other end and sidewall, so as to reinforce the corresponding weld; wherein, the installation posture 6 of pipe 1 on the first fixed station 9, the second fixed station 10, the third fixed station 11, and the fourth fixed station 12 is different, and its spatial posture can be adjusted by rotation or flipping to adapt to the operational requirements of different welding positions.

[0053] During operation, pipe 1 and first flange 2 are first clamped at the first fixed station 9. After fixing, one end of pipe 1 is initially welded to flange 2. After welding, the clamping angle of pipe 1 is adjusted manually or by a robot and fixed at the second fixed station 10 to position the weld seam in a convenient welding position. The weld seam at this end is then reinforced. After the weld seam of flange 2 at one end of pipe 1 is reinforced, the clamping angle of pipe 1 is adjusted manually or by a robot and fixed at the third fixed station 11. At the third fixed station 11, another flange 2 and connector 3 are simultaneously clamped to ensure the accurate relative position of each component to pipe 1. Subsequently, the butt weld of the other end of pipe 1 to flange 2 and the fillet weld of the side wall to connector 3 are completed sequentially or simultaneously. Finally, pipe 1 is transferred to the fourth fixed station 12, and its spatial posture is adjusted to position the welded area in the optimal welding position. The weld seam of the other end flange 2 and connector 3 is then reinforced to further improve the weld penetration, forming quality, and structural reliability, ensuring that the joint has good sealing performance and load-bearing capacity.

[0054] This invention decomposes the multi-component welding process of pipeline 1 into four stages—"preliminary welding, reinforcement welding, assembly welding, and secondary reinforcement"—by setting up a first fixed station 9, a second fixed station 10, a third fixed station 11, and a fourth fixed station 12, forming an assembly line-style operation process. Compared with the traditional welding method that relies on manual alignment and temporary fixing, this solution has the following significant advantages: Each station is equipped with a high-rigidity clamping structure and a unified positioning system, which effectively resists thermal deformation caused by arc heat input and workpiece vibration or displacement caused by welding stress release during the welding process, ensuring that the flange 2 and the pipeline 1 axis always remain concentric and avoiding tilting of the sealing surface after welding. Precise positioning ensures that the contact surface of the connector 3 and the pipeline 1 strictly conforms to the design angle, preventing stress concentration caused by poor contact and ensuring the subsequent assembly accuracy and structural load-bearing performance. The standardized clamping process eliminates human operation differences, ensuring that the position, height, width, and forming quality of each weld are highly consistent. Meanwhile, by strengthening the welding process, weld penetration is effectively controlled, defects such as undercut and lack of fusion are reduced, and the sealing reliability and structural strength of the joint are significantly improved. The improved welding precision and stability greatly reduce rework and even scrap caused by welding deviations, resulting in a stable increase in product yield, significant savings in material and labor costs, and a lower repair rate.

[0055] To ensure stable fixation of pipe 1, flange 2, and connector 3, both the first fixing station 9 and the third fixing station 11 are equipped with a first fixing component 13. The first fixing component 13 shares a core structure with the first fixing station 9 and the third fixing station 11, but its functional configuration and operation process differ depending on the welding task.

[0056] The flange 2 has a center hole 4 and a threaded hole 5, and the connector 3 has a through hole 6 that extends through its thickness.

[0057] Specifically, the first fixing component 13 includes:

[0058] The first support block 14 is fixedly mounted on the support plate 8. The first support block 14 is provided with a first positioning post 15 and a second positioning post 16. The first positioning post 15 is inserted into the center hole 4 of the flange 2, and the second positioning post 16 is inserted into the threaded hole 5 of the flange 2, which is used to provide support and positioning for the flange 2 to be welded.

[0059] The second support block 17 is vertically mounted on the support plate 8 and is located to the side of the first support block 14 to support the pipe 1.

[0060] The clamping block 18 is movably positioned above the second support block 17 and is used to clamp the pipe 1.

[0061] The first driving component 19 is located below the support plate 8, and its output end is connected to the second support block 17. It is used to drive the component to move up and down in the vertical direction to adapt to the clamping requirements of pipes 1 of different diameters.

[0062] The second driving component 20 is mounted on the support plate 8, and its output end is connected to the clamping block 18. It is used to drive the clamping block 18 to rotate and lift, thereby clamping and releasing the pipe 1.

[0063] The movable seat 21 is horizontally movable on the support plate 8.

[0064] The third support block 22 is connected to the movable base 21, and a third positioning post 23 is provided on it for inserting into the through hole 6 of the connector 3 to realize the positioning and support of the connector 3.

[0065] The positioning block 24 is fixedly installed on the support plate 8 and is arranged opposite to the third support block 22; one side of the outer wall of the pipe 1 is in contact with the positioning block 24 to achieve axial positioning.

[0066] The fixing washer 25 is fitted around the outer periphery of the pipe 1 and its bottom is engaged in the placement groove of the second support block 17 to provide radial limit.

[0067] Two fourth support blocks 26 are respectively set on the support plate 8, and positioning pins 27 are provided on them. Positioning holes are provided on both sides of the positioning block 24, and the holes are fitted onto the positioning pins 27 to realize the detachable installation of the positioning block 24.

[0068] The third driving component 28 is located below the support plate 8, and its output end is connected to the movable base 21 to drive it to move horizontally.

[0069] More preferably, the movable seat 21 is provided with a first abutting part 29 and a second abutting part 30. The first abutting part 29 is used to abut against the positioning block 24 during the movement to enhance its stability during installation. The second abutting part 30 is used to abut against the fixing washer 25 to lock it in the placement groove and prevent it from loosening due to vibration during the welding process.

[0070] The positioning block 24 has a support arm 3131 and a positioning groove 3232 located in its middle. The positioning groove 3232 fits against the outer circumferential surface of the pipe 1 to achieve precise positioning. The dimensions of the support arm 3131 in the positioning block 24 at the first fixed station 9 and the third fixed station 11 can be differentiated according to the installation posture 6 of the pipe 1 at different stations. Since the spatial orientation of the pipe 1 differs at different stations, its contact position with the positioning block 24 also changes. Using support arms 3131 of different sizes can better adapt to actual clamping requirements and provide more stable positioning and support.

[0071] The clamping process at the first fixed station 9 involves welding only one end of pipe 1 to flange 2, as follows:

[0072] The first step is to place the flange 2 to be welded on the first support block 14, so that the first positioning pin 15 on the first support block 14 is inserted into the center hole 4 of the flange 2, and the second positioning pin 16 is inserted into its threaded hole 5, so as to achieve high-precision positioning and stable support of the flange 2.

[0073] The second step is to place one side of the pipe 1 on the second support block 17 and make its end face abut against the end face of the already positioned flange 2 to form a mating state.

[0074] The third step is to fit the fixing washer 25 into the pipe 1 and place it in the placement groove of the second support block 17 to provide initial radial constraint.

[0075] Fourth step, adjust the position of pipe 1 so that one outer wall of it fits into the positioning groove 3232 on the positioning block 24 to achieve axial limiting;

[0076] Fifth step, start the first drive component 19 to drive the second support block 17 to rise and fall, adjust the height of pipe 1 to ensure that its end face to be welded is on the same horizontal plane as the end face of flange 2, and achieve precise alignment;

[0077] The sixth step is to activate the third drive unit 28 to drive the movable seat 21 to move until the first abutting part 29 on the movable seat 21 abuts against the positioning block 24, thereby enhancing the stability of the positioning block 24; at the same time, the second abutting part 30 abuts against the fixing washer 25, locking it in the placement groove to prevent loosening.

[0078] Step 7: Activate the second drive component 20 to drive the clamping block 18 to rotate and press down, finally pressing against the top of the pipe 1, forming a clamping structure together with the second support block 17, thus completing the clamping of the pipe 1.

[0079] At this point, the first fixed station 9 has completed the clamping of pipe 1 and flange 2, and preliminary welding can be carried out.

[0080] The clamping process at the third fixed station 11, along with the welding of the other end flange 2 and the side wall connector 3, is as follows:

[0081] The first step is to place the second flange 2 to be welded on the first support block 14, and insert the first positioning post 15 and the second positioning post 16 into its center hole 4 and threaded hole 5 to complete the precise positioning.

[0082] The second step is to perform preliminary clamping of pipe 1 in the manner of the second to fifth steps of the clamping process of the first fixed station 9 described above (including abutting against flange 2, fitting with positioning block 24, installing fixing gasket 25, and height adjustment).

[0083] The third step is to align the connector 3 to be welded with the third positioning post 23 on the third support block 22, so that the third positioning post 23 is inserted into the through hole 6 of the connector 3, thus completing the initial positioning of the connector 3.

[0084] Fourth step, activate the third drive component 28 to drive the moving seat 21 to move horizontally. The moving seat 21 drives the third support block 22 to move synchronously, pushing the connector 3 gradually closer to the side wall of the pipe 1 until it is tightly fitted with the part to be welded on the pipe 1, ensuring a uniform welding gap. While the connector 3 is fitted with the pipe 1, the first abutting part 29 on the moving seat 21 abuts against the positioning block 24, enhancing the stability of the positioning block 24 under stress. At the same time, the second abutting part 30 abuts against one side of the fixing washer 25, firmly locking it in the placement groove of the second support block 17 to prevent loosening due to vibration during the welding process.

[0085] Fifth step, start the second drive component 20 to drive the clamping block 18 to rotate and press down, completing the overall clamping.

[0086] At this point, the third fixed station 11 has completed the coordinated clamping of pipe 1, flange 2 and connector 3, and can be used for combined welding.

[0087] The first driving component 19 and the third driving component 28 can be a motor, a hydraulic cylinder or a pneumatic cylinder, and the second driving component 20 can be a motor or a pneumatic cylinder.

[0088] In order to achieve stable fixation of pipe 1 during the weld reinforcement stage, both the second fixing station 10 and the fourth fixing station 12 are equipped with a second fixing component 33.

[0089] More preferably, the second fixing component 33 includes: a fifth support block 34, fixedly mounted on the support plate 8, on which a fourth positioning post 35 is provided; the fourth positioning post 35 is inserted into the threaded hole 5 of the flange 2 for positioning and supporting the flange 2, preventing it from rotating or shifting during welding. A fixing rod 36, mounted on the support plate 8, can be an L-shaped or cantilever structure, for extending above or to the side of the pipe 1. A fixing member 37, connected to one end of the fixing rod 36, has a snap-fit ​​groove 38 on its inner side, the snap-fit ​​groove 38 matches the outer wall of the pipe 1, the snap-fit ​​groove 38 snaps onto the pipe 1, and is locked by bolts 39 to fix the pipe 1.

[0090] Since the second fixed station 10 and the fourth fixed station 12 use the same structure of the second fixed component 33, their fixing process is as follows:

[0091] The pipe 1 that needs to be reinforced by weld is moved to the target fixed position and its spatial orientation is adjusted so that the weld to be reinforced is in a position that is convenient for welding.

[0092] Align the flange 2 at one end of the pipe 1 with the fourth positioning pin 35 on the fifth support block 34, and place the flange 2 on the fifth support block 34 in the vertical direction so that the fourth positioning pin 35 is inserted into the threaded hole 5 of the flange 2, thereby achieving precise positioning and support of the flange 2.

[0093] Adjust the position of the fastener 37 so that the arc-shaped snap-fit ​​groove 38 fits properly on the outer wall of the pipe 1;

[0094] Use bolts 39 to press the pipe 1 into the snap-fit ​​groove 38 to prevent it from shaking or axially displacing during the welding process;

[0095] After confirming that the workpiece is securely fixed, perform reinforcement welding on the weld seam.

[0096] The second fixed station 10 and the fourth fixed station 12 use the same second fixed component 33, which is simple in structure, easy to maintain, and conducive to standardized production. The flange 2 is quickly positioned by inserting the fourth positioning pin 35 into the threaded hole 5, resulting in high clamping efficiency. Although the welding parts of the second fixed station 10 and the fourth fixed station 12 are different, the layout of the fifth support block 34 and the fixing rod 36 can be finely adjusted according to actual needs to adapt to the spatial orientation of the pipe 1 at different stations.

[0097] In order to adjust the installation height of the support plate 8 on the workbench 7, an adjustment component 40 is also provided on the workbench 7. One side of the support plate 8 is connected to the workbench 7 through the adjustment component 40. The adjustment component 40 is used to adjust the height of the support plate 8 connected to the workbench 7 on that side.

[0098] More preferably, the adjustment assembly 40 includes: a connecting seat 41, which is fixed on the worktable 7; an adjustment screw 42, one end of which is connected to the connecting seat 41 and the other end of which passes through the support plate 8, and two locking nuts 43 are respectively pressed against both sides of the support plate 8 in the thickness direction and threadedly connected to the adjustment screw 42, for locking the height position of one side of the support plate 8 connected to the worktable 7.

[0099] When the height needs to be adjusted, loosen the two locking nuts 43 and manually adjust the connection height of the support plate 8 on the adjusting screw 42. After adjustment, tighten the locking nuts 43 to fix the position.

[0100] The height of one side of the support plate 8 can be adjusted according to the welding process requirements, so that the support plate 8 is tilted relative to the worktable 7 instead of being completely parallel, thereby adjusting the weld to a flat welding or downslope welding position, improving welding operability and weld formation quality.

[0101] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0102] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0103] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A multi-station welding fixture for performing step-by-step welding of multiple fittings on a pipeline, wherein flanges are to be welded to both ends of the pipeline, and connectors are to be welded to the sidewalls of the pipeline, characterized in that... The multi-station welding fixture includes: A workbench with a support plate on it; The first fixed station, which is set on the support plate, is used to fix the pipe and one of the flanges for preliminary welding of one end of the pipe; The second fixed station is located to the side of the first fixed station and is used to fix the pipe after the initial welding of one end is completed, so as to reinforce the corresponding weld. The third fixed station is located to the side of the second fixed station and is used to fix the pipe, another flange and the connector for welding the other end and sidewall. The fourth fixed station is located to the side of the third fixed station and is used to fix the pipe after the welding of the other end and the side wall is completed, so as to reinforce the corresponding weld. The pipe is installed in different postures at the first fixed station, the second fixed station, the third fixed station, and the fourth fixed station to adapt to the positioning requirements of different welding positions.

2. The multi-station welding fixture as described in claim 1, characterized in that, Both the first fixed workstation and the third fixed workstation are equipped with a first fixed component.

3. The multi-station welding fixture as described in claim 2, characterized in that, The flange has a center hole and a threaded hole, and the first fixing assembly includes: A first support block is fixedly mounted on the support plate. The first support block is provided with a first positioning post and a second positioning post. The first positioning post is inserted into the central hole, and the second positioning post is inserted into the threaded hole, which are used to provide support and positioning for the flange to be welded. The second support block, which is liftable and mounted on the support plate and located to the side of the first support block, is used to provide support for the pipe. A clamping block is movably disposed above the second support block and abuts against the pipe placed on the second support block to fix the pipe. A first driving component is connected below the support plate, and a second support block is connected to the output end of the first driving component. The first driving component is used to drive the second support block to rise and fall. A second driving member is connected to the support plate, and the clamping block is connected to the output end of the second driving member. The second driving member is used to drive the clamping block to move.

4. The multi-station welding fixture as described in claim 3, characterized in that, The connector has a through hole extending along its thickness direction, and the first fixing component further includes: A movable seat, which is movably mounted on the support plate; A third support block is connected to the movable seat. The third support block is provided with a third positioning post, which is inserted into the through hole to provide support and positioning for the connector to be welded. A positioning block is disposed on the support plate and is positioned opposite to the third support block. One side of the pipe is in contact with the positioning block, and the other side is in contact with the connector placed on the third support block. A fixing washer is provided, wherein the second support block has a placement groove, the fixing washer is sleeved on the pipe and snapped into the placement groove, for providing radial limiting of the pipe; Two fourth support blocks are respectively set on the support plate. Each of the two fourth support blocks is provided with a positioning pin. The positioning blocks have positioning holes on both sides, and the positioning holes are fitted onto the positioning pins. A third driving component is connected below the support plate, and its output end is connected to the movable seat to drive the movable seat to move.

5. A multi-station welding fixture as described in claim 4, characterized in that, The movable seat is provided with a first abutting part and a second abutting part. The first abutting part abuts against the positioning block provided on the fourth support block to enhance its installation stability. The second abutting part abuts against the fixing washer sleeved on the pipe to fix the fixing washer.

6. The multi-station welding fixture as described in claim 4, characterized in that, The positioning block has a support arm and a positioning groove located in its middle position, the positioning groove being in contact with the outer circumferential surface of the pipe.

7. The multi-station welding fixture as described in claim 3, characterized in that, Both the second fixed station and the fourth fixed station are equipped with a second fixing component for fixing the pipe that needs to be reinforced by weld.

8. The multi-station welding fixture as described in claim 7, characterized in that, The second fixing component includes: The fifth support block is mounted on the support plate, and the fifth support block is provided with a fourth positioning post, which is inserted into the threaded hole of the flange to provide support. A fixing rod is mounted on the support plate. One end of the fixing rod is connected to a fixing member. The fixing member has a snap-fit ​​groove, which snaps onto the pipe and is locked with bolts to fix the pipe.

9. A multi-station welding fixture as described in claim 1, characterized in that, An adjustment component is also provided on the workbench. One side of the support plate is connected to the workbench through the adjustment component, and the adjustment component is used to adjust the height of the support plate connected to the workbench.

10. A multi-station welding fixture as described in claim 9, characterized in that, The adjustment component includes: A connecting seat, which is fixedly mounted on the workbench; An adjusting screw has one end connected to the connecting seat and the other end passing through the support plate. Two locking nuts are respectively pressed against both sides of the support plate in the thickness direction and threaded onto the adjusting screw, which is used to lock the height position of one side of the support plate connected to the worktable.

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