Electrofusion saddle pipe fusion welding auxiliary jig

Abstract

The utility model provides a kind of electric melting saddle pipe fitting fusion welding auxiliary fixture, belong to pipeline welding technical field, it is used to electric melting saddle pipe fitting clamping and fixed in main pipeline, electric melting saddle pipe fitting has the welding arc plate that is in line with main pipeline, two arc ends of welding arc plate are all with flanging. The above-mentioned electric melting saddle pipe fitting fusion welding auxiliary fixture includes jack, counterforce seat, fastening band and two compression strips. Fastening band is around main pipeline and is tightly gripped two flanging, and one end of fastening band is fixedly connected with counterforce seat, other end is detachably connected with counterforce seat;Jack is threaded in counterforce seat and is threadedly cooperated with counterforce seat, and the end portion of jack passing through counterforce seat is used to resist and press electric melting saddle pipe fitting;Two compression strips are respectively pressed on two flanging, and are all pressed welding arc plate towards the center of main pipeline under the tightening action of fastening band. The electric melting saddle pipe fitting fusion welding auxiliary fixture provided by the utility model is not only simple and convenient to operate, but also can save material consumption, reduce pipeline construction cost.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline welding technology, specifically relating to an auxiliary fixture for electrofusion saddle-shaped pipe welding. Background Technology

[0002] Electrofusion saddle fittings are widely used in municipal water supply and drainage, natural gas transmission and distribution, and chemical pipeline transportation. Special clamps are required for fixing electrofusion saddle fittings to the main pipeline during the fusion welding process. Electrofusion saddle fittings are typically equipped with a welding arc plate that fits snugly against the main pipeline. Heating with a heating wire melts and welds the welding arc plate and the pipe wall of the main pipeline together.

[0003] In existing technologies, a plastic clamping plate is typically used opposite the welding arc plate and connected to it via fasteners to clamp the main pipeline, ensuring a tight fit between the welding arc plate and the main pipeline. This connection method requires folded edges at both ends of the welding arc plate for fastener insertion. The drawback is that the folded edges of the welding arc plate are prone to stress concentration and deformation, leading to poor fit between the welding arc plate edges and the main pipeline, thus affecting the weld quality. Furthermore, this method is not only complex to operate, but the plastic clamping plate is usually not removed after welding (even if removed, it cannot be reused due to deformation during the welding process), resulting in material waste and increased pipeline construction costs. Utility Model Content

[0004] This utility model provides an auxiliary fixture for electrofusion saddle-shaped pipe welding, which aims to improve the welding quality and operational convenience of electrofusion saddle-shaped pipe fittings to the main pipeline and reduce material waste.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An auxiliary clamp for electrofusion saddle-shaped pipe fitting welding is provided, used to clamp and fix the electrofusion saddle-shaped pipe fitting to the main pipeline. The electrofusion saddle-shaped pipe fitting has a welding arc plate that fits against the main pipeline, and both arc ends of the welding arc plate have flanges. The auxiliary clamp for electrofusion saddle-shaped pipe fitting welding includes a top rod, a reaction seat, a fastening band, and two pressure strips. The fastening band surrounds the main pipeline and tightens the two flanges, with one end of the fastening band fixedly connected to the reaction seat and the other end detachably connected to the reaction seat. The top rod passes through the reaction seat and is threaded into it, and the end of the top rod passing through the reaction seat is used to press against the electrofusion saddle-shaped pipe fitting. The two pressure strips press against the two flanges respectively, and both, under the tightening action of the fastening band, press against the welding arc plate towards the center of the main pipeline.

[0006] In one possible implementation, the pressure strip includes a flat bottom surface for pressing against the flange and a side arc surface for abutting against the welding arc plate. The side of the pressure strip opposite to its side arc surface is provided with a groove suitable for embedding the fastening strip, and the vertical line of the bottom of the groove passes through the center of the main pipe.

[0007] In some embodiments, the electrofusion saddle-shaped pipe fitting welding auxiliary fixture includes two spaced-apart fastening bands, and each pressure bar has two grooves corresponding to the two fastening bands.

[0008] In one possible implementation, a fixed shaft and a clamp are provided on both sides of the reaction seat, and one end of the fastening band is sleeved and fixed to the fixed shaft, while the other end passes through the clamp to form a detachable connection; wherein the distance between the fixed shaft and the clamp is less than the distance between the two flanges.

[0009] For example, the clamp includes a clamping plate, a pressure plate, and an elastic element; the clamping plate is fixedly connected to the reaction seat and has a clamping surface parallel to the fastening band; the pressure plate is rotatably connected to the clamping plate and the axial direction of the rotation axis is parallel to the clamping surface, one end of the pressure plate forms a chuck, and a clamping opening is formed between the chuck and the clamping surface; the elastic element is disposed between the pressure plate and the clamping plate and is used to drive the chuck to elastically press against the clamping surface; wherein, when the force direction of the fastening band is a first direction, the clamping opening is driven by the friction of the fastening band, and when the force direction of the fastening band is a second direction, the clamping opening is driven by the friction of the fastening band.

[0010] For example, the clamping surface has an arc-shaped protrusion, and when the clamp is tightened, the clamp will press the fastening band against the arc-shaped protrusion.

[0011] In some embodiments, the end of the pressure plate away from its chuck forms an operating handle, and the rotation axis is located between the chuck and the operating handle.

[0012] In one possible implementation, the push rod is rotatably connected to the end of the reaction seat to a loading member for pressing against the electrofusion saddle fitting.

[0013] For example, the loading component includes a connecting sleeve, a pressure head, and a buffer; the connecting sleeve is rotatably connected to the end of the push rod; one end of the pressure head is slidably connected to the connecting sleeve along the axial direction of the connecting sleeve, and the other end is used to press against the end face of the electrofusion saddle-shaped pipe fitting; the buffer is disposed in the connecting sleeve and connected to the pressure head, and is used to apply an elastic pushing force to the pressure head.

[0014] For example, the center of the reaction seat is provided with a threaded sleeve, and the push rod is threadedly engaged with the threaded sleeve; both sides of the reaction seat are provided with clearance grooves for the end of the fastening band to extend into.

[0015] The beneficial effects of the electrofusion saddle-shaped pipe fitting welding auxiliary fixture provided by this utility model are as follows: Compared with the prior art, the electrofusion saddle-shaped pipe fitting welding auxiliary fixture of this utility model, after the welding arc plate of the electrofusion saddle-shaped pipe fitting is placed at the welding position of the main pipeline, the top rod is pressed against the electrofusion saddle-shaped pipe fitting, and then the fastening band is wrapped around the main pipeline and connected to the reaction seat. By screwing the top rod, the reaction seat is gradually moved away from the main pipeline until the fastening band is taut. Then, two pressure strips are placed on the two flanges respectively and the top rod is screwed on again. Finally, the top rod is pressed against the electrofusion saddle-shaped pipe fitting, and the fastening band is pressed against the flanges and pressure strips at both ends of the welding arc plate. The pressure strips can make the two sides of the welding arc plate evenly stressed and close to the pipe wall of the main pipeline, avoiding stress concentration deformation at the edge of the welding arc plate during the welding process, which would affect the welding quality. After welding, the end of the fastening band that is detachably connected to the reaction seat can be directly disassembled and the whole fixture can be removed for welding and fixing of the next electrofusion saddle-shaped pipe fitting. It is not only simple and convenient to operate, but also saves consumables and reduces pipeline construction costs. Attached Figure Description

[0016] Figure 1 A three-dimensional structural schematic diagram of the electrofusion saddle-shaped pipe welding auxiliary fixture provided in the embodiment of this utility model; Figure 2 A cross-sectional view of the electrofusion saddle-shaped pipe fitting welding auxiliary fixture provided in this embodiment of the utility model; Figure 3 This is a three-dimensional structural diagram of the pressure strip used in the embodiment of this utility model; Figure 4 This is a cross-sectional view of the clamp used in an embodiment of the present invention.

[0017] In the diagram: 10. Electrofusion saddle-shaped pipe fitting; 11. Welded arc plate; 12. Flanged edge; 20. Main pipe; 30. Top rod; 31. Loading component; 311. Connecting sleeve; 312. Pressure head; 313. Buffer component; 40. Reaction seat; 41. Fixed shaft; 42. Clamp; 421. Clamping plate; 4211. Clamping surface; 4212. Arc-shaped protrusion; 422. Pressure plate; 4221. Rotating shaft; 4222. Clamp; 4223. Operating handle; 423. Elastic component; 43. Threaded sleeve; 44. Clear groove; 50. Fastening band; 60. Pressure strip; 61. Flat bottom surface; 62. Side arc surface; 63. Groove. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] It should be noted that when an element is referred to as being "set on" or "connected to" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used 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.

[0020] It should be noted that in existing technologies, the main pipeline typically has a large diameter, while the electrofusion saddle fitting has a smaller diameter. The electrofusion saddle fitting has an integrally formed welding arc plate that fits snugly against the wall of the main pipeline. The welding arc plate contains a heating wire; when it is pressed against the main pipeline, the heat from the heating wire melts the arc plate, and after cooling, it is fused to the main pipeline. Currently, the common method for fixing the electrofusion saddle fitting to the main pipeline during welding is to use a plastic clamp and the flanges on both sides of the welding arc plate connected by fasteners such as bolts. Therefore, the stress on the edge of the welding arc plate is mainly concentrated at the fastener connection point, which easily leads to edge deformation during welding. This results in the welding arc plate failing to fit snugly against the main pipeline wall, negatively impacting the reliability and sealing of the weld.

[0021] Please refer to the following: Figures 1 to 4 The auxiliary clamp for electrofusion saddle-shaped pipe fitting welding provided by this utility model is described below. The auxiliary clamp for electrofusion saddle-shaped pipe fitting welding is used to clamp and fix the electrofusion saddle-shaped pipe fitting 10 to the main pipe 20. The electrofusion saddle-shaped pipe fitting 10 has a welding arc plate 11 that fits against the main pipe 20. Both arc ends of the welding arc plate 11 have flanges 12. The auxiliary clamp for electrofusion saddle-shaped pipe fitting welding includes a top rod 30, a reaction seat 40, a fastening band 50, and two pressure strips 60.

[0022] The fastening band 50 surrounds the main pipe 20 and tightens the two flanges 12. One end of the fastening band 50 is fixedly connected to the reaction seat 40, and the other end is detachably connected to the reaction seat 40. The push rod 30 passes through the reaction seat 40 and is threaded into the reaction seat 40. The end of the push rod 30 passing through the reaction seat 40 is used to press against the electrofusion saddle-shaped pipe fitting 10. The two pressure strips 60 press against the two flanges 12 respectively, and both press against the welding arc plate 11 towards the center of the main pipe 20 under the tightening action of the fastening band 50.

[0023] It should be understood that in this embodiment, the detachable connection between the fastening band 50 and the reaction seat 40 can be achieved through fasteners or clamps, and no limitation is made here. Since the main pipe 20 is relatively long, during installation, the detachable connection end of the fastening band 50 can be contacted first, and then the fastening band 50 can be wrapped around the main pipe 20 before reconnecting, thereby improving the ease of operation.

[0024] In the existing technology, the method of fixing the electrofusion saddle-shaped pipe fitting 10 with a plastic clamp 421 requires the configuration of a plastic clamp 421 with the same curvature when dealing with main pipes 20 of different diameters. This embodiment, by using a fastening band 50 to surround the main pipe 20, can meet the application requirements of main pipes 20 of any diameter, and has high adaptability. This also makes a significant contribution to saving materials and costs.

[0025] Rotating the push rod 30 allows it to move axially relative to the reaction seat 40, thus changing the distance between the reaction seat 40 and the main pipe 20. Since both ends of the fastening band 50 are connected to the reaction seat 40, the fastening band 50 can be gradually tightened, thereby applying increasing pressure to the electrofusion saddle-shaped pipe fitting 10 by the push rod 30. At the same time, the tightened fastening band 50 also provides pressure against the two outwardly folded flanges 12 at the two arc ends of the welding arc plate 11, thus preventing the push rod 30 from pressing against the end of the electrofusion saddle-shaped pipe fitting 10 and causing its two sides to lift. In addition, the fastening band 50 also provides pressure against the pressure strips 60 placed on the two flanges 12, and then the pressure strips 60 press the edge of the welding slide plate tightly against the pipe wall of the main pipe 20, thereby ensuring the overall tight fit between the welding slide plate and the main pipe 20.

[0026] Compared with the prior art, the electrofusion saddle-shaped pipe fitting welding auxiliary fixture provided in this embodiment, after the welding arc plate 11 of the electrofusion saddle-shaped pipe fitting 10 is placed at the welding position of the main pipe 20, the push rod 30 is pressed against the electrofusion saddle-shaped pipe fitting 10, and then the fastening band 50 is wrapped around the main pipe 20 and connected to the reaction seat 40. By screwing the push rod 30, the reaction seat 40 is gradually moved away from the main pipe 20 until the fastening band 50 is taut. Then, the two pressure strips 60 are placed on the two flanges 12 respectively and the push rod 30 is screwed on, finally forming the push rod 30 pressing against the electrofusion saddle-shaped pipe fitting. 10. The fastening band 50 presses against the two ends of the welding arc plate 11, the flanges 12 and the pressure strip 60. The pressure strip 60 can make the two sides of the welding arc plate 11 evenly stressed and close to the pipe wall of the main pipe 20, so as to avoid stress concentration deformation at the edge of the welding arc plate 11 during the fusion welding process, which would affect the welding quality. After the welding is completed, the fastening band 50 can be detached from the end that is detachably connected to the reaction seat 40 and then removed as a whole for the fusion welding and fixing of the next electrofusion saddle pipe fitting 10. It is not only simple and convenient to operate, but also saves consumables and reduces pipeline construction costs.

[0027] In some embodiments, see Figure 1 and Figure 3 The pressure strip 60 includes a flat bottom surface 61 for pressing against the flange 12 and a side arc surface 62 for abutting against the welding arc plate 11. The side of the pressure strip 60 opposite to its side arc surface 62 is provided with a groove 63 suitable for embedding the fastening band 50. The vertical line of the bottom of the groove 63 passes through the center of the main pipe 20.

[0028] The distance between the two ends of the fastening band 50 connected to the reaction seat 40 is less than the distance between the two flanges 12. This ensures that the fastening band 50 forms a resistance force on the pressure strip 60 placed on the two flanges 12 in the direction of the center of the main pipe 20. In turn, the pressure strip 60 makes the edge of the welding slide plate fit tightly against the main pipe 20. At the same time, in order to avoid the fastening band 50 from being misaligned and thus losing tension, the groove 63 on the pressure strip 60 can be used to limit the fastening band 50, thereby improving the fastening stability.

[0029] It should be noted that, as Figure 1 As shown, the aforementioned electrofusion saddle-shaped pipe fitting welding auxiliary fixture includes two spaced-apart fastening bands 50, and each pressure bar 60 is provided with two grooves 63 corresponding to the two fastening bands 50. Applying a pressure force to the pressure bar 60 using the two fastening bands 50 improves the force balance of the pressure bar 60, thereby ensuring the tight fit of the welding arc plate 11 to the main pipe 20 under the pressure of the pressure bar 60, which is beneficial to improving the welding quality.

[0030] For some possible implementations, please refer to [link / reference]. Figure 1 The reaction seat 40 is provided with a fixed shaft 41 and a clamp 42 on both sides respectively. One end of the fastening band 50 is sleeved and fixed to the fixed shaft 41, and the other end is inserted through the clamp 42 to form a detachable connection. The distance between the fixed shaft 41 and the clamp 42 is less than the distance between the two flanges 12.

[0031] One end of the fastening band 50 can be sewn into a ring suitable for fitting onto the fixed shaft 41, while the other end serves as a free end. When it is necessary to fix the electrofusion saddle-shaped pipe fitting 10, its free end can be passed through the clamp 42 and clamped. After welding is completed, the clamp 42 can be released to remove the free end of the fastening band 50, thereby removing the entire fixture. The operation is simple and convenient.

[0032] As one specific embodiment of the clamp 42 described above, please refer to Figure 4 The clamping device 42 includes a clamping plate 421, a pressure plate 422, and an elastic element 423. The clamping plate 421 is fixedly connected to the reaction seat 40 and has a clamping surface 4211 parallel to the fastening band 50. The pressure plate 422 is rotatably connected to the clamping plate 421 and the axial direction of the rotation shaft 4221 is parallel to the clamping surface 4211. One end of the pressure plate 422 forms a chuck 4222, and a clamping opening is formed between the chuck 4222 and the clamping surface 4211. The elastic element 423 is disposed between the pressure plate 422 and the clamping plate 421 and is used to drive the chuck 4222 to elastically press against the clamping surface 4211. When the force direction of the fastening band 50 is the first direction, the clamping opening is driven by the friction of the fastening band 50, and when the force direction of the fastening band 50 is the second direction, the clamping opening is driven by the friction of the fastening band 50.

[0033] Here, the first direction is the direction of force on the fastening belt 50 when it is pulled away from the main pipe 20, and the second direction is the direction of the reaction force received by the fastening belt 50 when the push rod 30 pushes the reaction seat 40. This direction is opposite to the first direction. The pressure plate 422 and the clamping plate 421 form an angle. When the fastening band 50 passes through the clamping opening at the corner of the angle along the first direction, the fastening band 50 can drive the pressure plate 422 to overcome the elastic force of the elastic element 423 and drive the clamping opening to open. This allows the fastening band 50 to pass through the clamping opening smoothly and be pulled along the first direction until it is taut. When the top rod 30 is turned to apply tension to the fastening band 50, the fastening band 50 will move in the opposite direction from the corner of the angle to pass through the clamping opening. At this time, the direction of the friction force of the fastening band 50 on the clamping head 4222 is reversed compared to before. The greater the tension of the fastening band 50, the tighter the clamping opening will be. This can avoid the problem of the band coming off during the tensioning process. When it is necessary to remove the clamp, simply overcome the elastic force of the elastic element 423 and flip the pressure plate 422 to loosen the clamping opening, thereby pulling the free end of the fastening band 50 out of the clamping opening. The operation is simple and convenient.

[0034] Specifically, the elastic element 423 can be a torsion spring fitted on the rotating shaft 4221 of the pressure plate 422. One end of the torsion spring is connected to the pressure plate 422, and the other end is connected to the clamping plate 421, so that the pressure plate 422 forms a stable state of elastic pressure against the pressure plate 422.

[0035] To improve the clamping reliability of the clamp on the fastening band 50, such as Figure 4 As shown, the clamping surface 4211 is provided with an arc-shaped protrusion 4212. When the clamp is tightened, the clamp 4222 presses the fastening band 50 against the arc-shaped protrusion 4212. By setting the arc-shaped protrusion 4212, the contact area between the fastening band 50 and the clamping surface 4211 can be reduced, thereby avoiding the fastening band 50 slipping on the clamping surface 4211 and causing tension loss, thus improving the fixing reliability of the electrofusion saddle-shaped pipe fitting 10.

[0036] It should be noted that you should refer to [link / reference]. Figure 4 The end of the pressure plate 422 away from its clamp 4222 forms an operating handle 4223, and the rotating shaft 4221 is located between the clamp 4222 and the operating handle 4223. The middle part of the pressure plate 422 is rotatably connected to the clamp 421, and the operating handle 4223 at one end forms a lever to ensure that the operator can easily release the clamp by pressing the operating handle 4223, thereby improving the convenience of operation.

[0037] For some possible implementations, please refer to [link / reference]. Figure 2The end of the push rod 30, which passes through the reaction seat 40, is rotatably connected to a loading member 31 for pressing against the electrofusion saddle-shaped pipe fitting 10. By setting the loading member 31, which can rotate relative to the push rod 30, to abut against the electrofusion saddle-shaped pipe fitting 10, it is possible to prevent the loading member 31 from remaining stationary relative to the electrofusion saddle-shaped pipe fitting 10 during the tightening of the push rod 30, thereby preventing relative rotation between the pressing surface and the electrofusion saddle-shaped pipe fitting 10 and thus avoiding wear of the electrofusion saddle-shaped pipe fitting 10.

[0038] As one specific embodiment of the above-described loading element 31, please refer to Figure 2 The loading component 31 includes a connecting sleeve 311, a pressure head 312, and a buffer component 313. The connecting sleeve 311 is rotatably connected to the end of the push rod 30. One end of the pressure head 312 is slidably connected to the connecting sleeve 311 along the axial direction of the connecting sleeve 311, and the other end is used to press against the end face of the electrofusion saddle-shaped pipe fitting 10. The buffer component 313 is disposed in the connecting sleeve 311 and connected to the pressure head 312, and is used to apply an elastic pushing force to the pressure head 312.

[0039] The aforementioned buffer 313 can be a spring or a disc spring; a bearing can be embedded in the connecting sleeve 311 to connect with the push rod 30, thereby ensuring the ease of relative rotation between the two. On this basis, the buffer 313 inside the connecting sleeve 311 applies an elastic pushing force to the pressure head 312, thereby causing the pressure head 312 to elastically press against the electrofusion saddle-shaped pipe fitting 10. When the fastening band 50 becomes loose unexpectedly during the welding process, the buffer 313 can release its elastic potential energy to ensure the pressure of the pressure head 312 against the electrofusion saddle-shaped pipe fitting 10, thereby improving the fixing reliability of the electrofusion saddle-shaped pipe fitting 10.

[0040] In some embodiments, the reaction seat 40 described above adopts, for example... Figure 2 The structure shown has a screw sleeve 43 at the center of the reaction seat 40, and the push rod 30 is threadedly engaged with the screw sleeve 43; both sides of the reaction seat 40 are provided with clearance grooves 44 for the end of the fastening band 50 to extend into.

[0041] By setting the threaded sleeve 43 to form a threaded engagement with the external thread on the circumferential wall of the push rod 30, the axial length of the threaded sleeve 43 can be used to increase the thread engagement length, thereby improving the connection reliability between the reaction seat 40 and the push rod 30. When thread failure occurs, there is no need to completely replace the reaction seat 40; only the threaded sleeve 43 needs to be replaced. This makes maintenance convenient and cost-effective.

[0042] By setting the clearance groove 44, the distance between the two connecting ends of the fastening band 50 can be shortened, which is conducive to increasing the wrap angle of the fastening band 50 to the main pipe 20, thereby increasing the clamping force of the fastening band 50 to the welding arc plate 11, and further improving the tightness of the welding arc plate 11 and the main pipe 20, which is conducive to improving the welding quality.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An auxiliary clamp for electrofusion saddle-shaped pipe fitting welding, used to clamp and fix the electrofusion saddle-shaped pipe fitting to a main pipeline, wherein the electrofusion saddle-shaped pipe fitting has a welding arc plate that fits against the main pipeline, and both arc ends of the welding arc plate have flanges; characterized in that, The electrofusion saddle-shaped pipe fitting welding auxiliary fixture includes a top rod, a reaction seat, a fastening band, and two pressure strips; The fastening band surrounds the main pipe and tightens the two flanges, with one end of the fastening band fixedly connected to the reaction seat and the other end detachably connected to the reaction seat; The push rod passes through the reaction seat and is threaded into the reaction seat, and the end of the push rod passing through the reaction seat is used to press against the electrofusion saddle-shaped pipe fitting; The two pressure strips press against the two flanges respectively, and both press against the welding arc plate toward the center of the main pipe under the clamping action of the fastening band.

2. The electrofusion saddle-shaped pipe fitting welding auxiliary fixture as described in claim 1, characterized in that, The pressure strip includes a flat bottom surface for pressing against the flange and a side arc surface for abutting against the welding arc plate. The side of the pressure strip opposite to its side arc surface is provided with a groove suitable for embedding the fastening band, and the vertical line of the bottom of the groove passes through the center of the main pipe.

3. The electrofusion saddle-shaped pipe fitting welding auxiliary fixture as described in claim 2, characterized in that, The electrofusion saddle-shaped pipe welding auxiliary fixture includes two fastening bands symmetrically distributed relative to the electrofusion saddle-shaped pipe, and each pressure bar is provided with two grooves corresponding to the two fastening bands.

4. The electrofusion saddle-shaped pipe fitting welding auxiliary fixture as described in claim 1, characterized in that, The reaction seat is provided with a fixed shaft and a clamp on both sides respectively. One end of the fastening band is sleeved and fixed to the fixed shaft, and the other end is passed through the clamp to form a detachable connection. The distance between the fixed shaft and the clamp is less than the distance between the two flanges.

5. The electrofusion saddle-shaped pipe fitting welding auxiliary fixture as described in claim 4, characterized in that, The clamp includes: A clamping plate is fixedly connected to the reaction seat, and the clamping plate has a clamping surface parallel to the fastening band; A pressure plate is rotatably connected to the clamping plate, with the axis of the rotation shaft parallel to the clamping surface. One end of the pressure plate forms a chuck, and a clamping opening is formed between the chuck and the clamping surface. An elastic element is disposed between the pressure plate and the clamping plate to drive the chuck to elastically press against the clamping surface; Specifically, when the force direction of the fastening band is in the first direction, the clamp opens due to the friction of the fastening band, and when the force direction of the fastening band is in the second direction, the clamp tightens due to the friction of the fastening band.

6. The electrofusion saddle-shaped pipe fitting welding auxiliary fixture as described in claim 5, characterized in that, The clamping surface is provided with an arc-shaped protrusion, and when the clamp is tightened, the clamp head presses the fastening band against the arc-shaped protrusion.

7. The electrofusion saddle-shaped pipe fitting welding auxiliary fixture as described in claim 5, characterized in that, The end of the pressure plate away from its clamp forms an operating handle, and the rotating shaft is located between the clamp and the operating handle.

8. The electrofusion saddle-shaped pipe fitting welding auxiliary fixture as described in claim 1, characterized in that, The top rod passes through the end of the reaction seat and is rotatably connected to a loading member for pressing against the electrofused saddle-shaped tube.

9. The electrofusion saddle-shaped pipe fitting welding auxiliary fixture as described in claim 8, characterized in that, The loading component includes: A connecting sleeve is rotatably connected to the end of the top rod; The pressure head has one end slidably connected to the connecting sleeve along the axial direction, and the other end is used to press against the end face of the electrofusion saddle-shaped pipe fitting. A buffer element, located inside the connecting sleeve and connected to the pressure head, is used to apply an elastic pushing force to the pressure head.

10. The electrofusion saddle-shaped pipe fitting welding auxiliary fixture as described in any one of claims 1-9, characterized in that, The reaction seat has a threaded sleeve at its center, and the push rod is threadedly engaged with the threaded sleeve; both sides of the reaction seat have clearance grooves for the end of the fastening band to extend into.

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