Clamping positioning device for pipe-to-pipe butt welding

Abstract

This invention relates to the field of welding technology, and more particularly to a clamping and positioning device for pipe-to-pipe butt welding. The device includes clamping jaws for fixing the pipe, each clamping jaw comprising an upper clamping arm and a lower clamping arm connected by a pivot shaft. Two clamping jaws are provided, and a connecting mechanism is provided between them. This connecting mechanism unites the two clamping jaws and is used to adjust their relative angle. This invention uses the connecting mechanism to combine the two clamping jaws into a single structure for fixing the pipe. This device uses one side of the pipe as the mechanical basis to fix the position of the other side of the pipe, eliminating the need for additional structures for butt welding and protecting the stability of the butt joint. The device is small in size, lightweight, easy to carry, and convenient to use.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a clamping and positioning device for pipe-to-pipe butt welding. Background Technology

[0002] Pipe-to-pipe welding is widely used in petroleum, chemical, power, construction, and municipal engineering fields, mainly for connecting pipeline systems to ensure the sealing and strength of the transported media. However, there are still many problems in the assembly and fixing before pipe-to-pipe welding, such as complex assembly processes, easy misalignment, misalignment of axes, and uneven welds caused by misalignment of pipe ends.

[0003] There are many existing devices for fixing pipes during butt welding, such as Chinese utility model patents 202322587305.4 and 202323667610.0, and Chinese invention patent application 201810680442.3. These are mostly fixing tools for straight butt welding and require a foundation around the pipe to fix the device and the pipe. For example, the utility model documents mentioned above require the device to be stably placed on the corresponding working surface, and their structure is heavy and inconvenient to carry. In contrast, the invention patent document mentioned above is a more convenient and simple pipe fixing device. When using it, a suction cup is used to fix the tool to the wall or well wall, and then the pipe is stabilized by a clamp.

[0004] In construction practice, due to the complex pipeline layout in many projects, it is often difficult to find a fixed foundation such as a wall or well wall in the surrounding area when welding pipelines on site. Therefore, the suspended welding of pipes is very inconvenient, especially in pipeline maintenance. Therefore, it is urgent to design a simple clamp for positioning and clamping to ensure the coaxiality between pipes, ensure uniform welds, and facilitate welding. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of misalignment, non-axis, and misalignment of pipe ends that occur during assembly when there is no corresponding fixed foundation, and to propose a simple positioning and clamping device for pipe butt welding.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A clamping and positioning device for pipe-to-pipe butt welding includes clamping clamps for fixing the pipe. The clamping clamps include an upper clamping arm and a lower clamping arm, which are connected by a pivot shaft. There are two clamping clamps, and a connecting mechanism is provided between the two clamping clamps. The connecting mechanism connects the two clamping clamps and is used to adjust the relative angle between the two clamping clamps.

[0007] Compared with the prior art, the present invention employing the above structure has the following advantages: This invention combines two clamping clamps together through a joint mechanism to form a fixed structure for the pipe. This device uses the pipe on one side as the mechanical basis to fix the position of the pipe on the other side, without the need for a separate structure for docking and fixing, thus protecting the stability of the docking point. This device is small in size, light in weight, easy to carry, and convenient to use.

[0008] As a preferred option, a further technical solution to the above structure is: The combined mechanism includes a first connecting rod and a second connecting rod arranged coaxially, with the ends of the first connecting rod and the second connecting rod rotatably engaged.

[0009] The beneficial effects obtained from the above features are: this solution can fix mutually misaligned pipes.

[0010] A spline rod is provided on the near end face of connecting rod one, and a spline groove is fixed to the near end face of connecting rod two, with the spline rod inserted inside the spline groove; several guide rods are evenly arranged circumferentially on the near end surfaces of connecting rod one and connecting rod two; the two ends of the first spring are respectively connected to the guide rods on connecting rod one and connecting rod two, thereby connecting connecting rod one and connecting rod two.

[0011] The beneficial effects obtained from the above features are: this example is easy to implement and has high fixation strength.

[0012] Positioning protrusions are provided on the surface of the adjacent end of connecting rod one, and angle scale marks corresponding to the spline groove are provided on the surface of the adjacent end of connecting rod two.

[0013] The beneficial effects obtained from the above features are: this example facilitates accurate adjustment of the relative positions of the two pipes to achieve quantitative displacement.

[0014] The combined mechanism has pivot shafts at both ends connected to two clamping jaws via a swing mechanism, which includes: The turbine blade is fixedly mounted at the end of the combined mechanism, and angle scales are provided on the outer edge of its front surface. The connecting seat is fixedly mounted on the surface of the pivot shaft. Its outer end is connected to the center of the turbine blade through a rotating shaft. The surface is provided with a window, and a pointer is provided in the window to point to the scale. The worm gear is installed inside the connecting seat, with both ends rotatably connected to the connecting seat and meshing with the turbine blades.

[0015] The beneficial effects obtained from the above features are: this example facilitates adjustment of the clamping clamp's rotation angle, the worm gear avoids angular node offset, and has good stability.

[0016] The clamping pliers of the present invention include: The upper clamping arm has an arc-shaped clamping part at the front end for gripping the pipe surface and a handle at the rear end. A shaft hole is provided at the position where the clamping part and the handle meet. A mounting groove is provided on the lower surface of the handle of the upper clamping arm. The lower clamping arm has a clamping part at the front end and a handle at the rear end. A shaft hole is provided at the position where the clamping part and the handle meet. A limit groove is provided on the upper surface of the handle of the lower clamping arm, and a limit rib is provided in the limit groove. A pivot shaft passes through the shaft holes of the upper clamping arm and the lower clamping arm. A nail head is fixed to the outer end of the pivot shaft, and a shaft shoulder is fixed to the inner end. The clamping support rod is hinged at the front end of the mounting groove, and a connecting groove is provided on the middle surface. A rivet is installed through the connecting groove, and a second spring is connected to the rivet. The other end of the second spring is connected to the rear end of the mounting groove. The clamping wrench includes a support rod, the upper end of which is hinged to the lower end of the clamping support rod. A wrench head is fixedly installed on the outer side of the upper end of the support rod. A limiting baffle that abuts against the surface of the clamping support rod is installed at the front end of the wrench head. A support column is installed at the lower end of the support rod and is engaged in the limiting groove.

[0017] The beneficial effects obtained from the above features are as follows: This solution utilizes the clamping rod and clamping wrench to fix the clamping force of the clamping pliers on the pipeline, which can stably grip the pipeline and facilitate operation. Attached Figure Description

[0018] Figure 1 This is a structural diagram of Embodiment 1 of the present invention; Figure 2 This is a structural diagram of the combined mechanism of the present invention; Figure 3 This is a schematic diagram of an improved example of the combined mechanism of the present invention; Figure 4 This is a structural diagram of the swing mechanism of the present invention; Figure 5 This is a schematic diagram of the angle variation of the swing mechanism of the present invention; Figure 6 This is an assembly structure diagram of the worm gear and connecting seat of the present invention; Figure 7 This is a schematic diagram of the arrangement structure of the worm gear and turbine blades of the present invention; Figure 8 This is a structural diagram of a single clamping plier embodiment of the present invention; Figure 9 This invention relates to a clamping arm structure; Figure 10 This is the lower clamping arm structure of the present invention; Figure 11 This invention relates to a clamping support rod structure; Figure 12 This invention relates to a clamping wrench structure; Figure 13This is a reference diagram of the present invention for fixing misaligned pipes; Figure 14 This is a reference diagram for the application of the present invention in fixing pipes at relative angles.

[0019] In the diagram: 1. Pipe; 2. Clamping clamp; 21. Upper clamping arm; 22. Lower clamping arm; 23. Pressing support rod; 24. Second spring; 25. Pressing support rod; 26. Anti-slip texture; 27. Pivot shaft; 2701. Nail head; 2702. Shoulder; 3. Joint mechanism; 31. Connecting rod one; 32. Connecting rod two; 33. Spline rod; 34. Spline groove; 35. Guide rod; 36. First spring; 301. Turbine plate; 302. Connecting seat; 303. Worm rod; 304. Rotating shaft. Detailed Implementation

[0020] The present invention will be further described below with reference to embodiments, which are intended only to provide a better understanding of the invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0021] See Figures 1 to 14 A clamping and positioning device for pipe-to-pipe welding includes clamping clamps 2 for fixing pipe 1. The clamping clamps 2 include an upper clamping arm 21 and a lower clamping arm 22. The two clamping arms are connected by a pivot shaft 27. There are two clamping clamps 2. A connecting mechanism 3 is provided between the two clamping clamps 2. The connecting mechanism 3 connects the two clamping clamps 2 and is used to adjust the relative angle between the two clamping clamps 2.

[0022] Specifically, the joint mechanism 3 includes a first connecting rod 31 and a second connecting rod 32 arranged coaxially, with the ends of the first connecting rod 31 and the second connecting rod 32 rotatably engaged.

[0023] As an alternative, see Figure 2 , Figure 3 A splined rod 33 is provided on the near end face of connecting rod 31, and a splined groove 34 is fixedly connected to the near end face of connecting rod 32, with the splined rod 33 inserted inside the splined groove 34. Several guide rods 35 are evenly arranged circumferentially on the near end surfaces of connecting rod 31 and connecting rod 32. The two ends of a first spring 36 are respectively connected to the guide rods 35 on connecting rod 31 and connecting rod 32, thereby connecting connecting rod 31 and connecting rod 32. Furthermore, positioning protrusions are provided on the near end surface of connecting rod 31, and angle markings corresponding to the grooves of splined groove 34 are provided on the near end surface of connecting rod 32.

[0024] The connecting rod 31 and the connecting rod 32 can be cylindrical rods, which are convenient to manufacture and make the tension of the first spring 36 on the surface uniform. The connecting rod 31 and the connecting rod 32 are installed together by the spline rod 33 and the spline groove 34, and are fastened by the first spring 36. At the same time, the two clamping clamps 2 are connected together. This solution enables the fixation of misaligned pipes 1, which is easy to implement, provides high fixation strength, and facilitates accurate adjustment of the relative positions of the two pipes 1, thereby achieving quantitative displacement.

[0025] Alternatively, the ends of connecting rod 1 31 and connecting rod 2 32 that are far apart are respectively fixedly connected to the surfaces of the pivot shafts 27 of the two clamping clamps 2.

[0026] As an alternative, see Figures 4 to 7 The combined mechanism 3 has pivot shafts 27 at both ends that are connected to the two clamping clamps 2 via a swing mechanism. The swing mechanism includes: Turbine blade 301 is fixedly mounted on the end of the combined mechanism 3, and angle scale is provided on the outer edge of its front surface. The connecting seat 302 is fixedly mounted on the surface of the pivot shaft 27. Its outer end is connected to the center of the turbine blade 301 through the rotating shaft 304. The surface is provided with a window, and a pointer is provided in the window to point to the scale. The worm gear 303 is installed inside the connecting seat 302, and its two ends are rotatably connected to the connecting seat 302 and mesh with the turbine blade 301.

[0027] This example allows for easy adjustment of the rotation angle of the clamping clamp 2, and the worm gear 303 prevents angular node offset and provides good stability.

[0028] As an alternative, see Figures 8 to 12 The clamping clamp 2 has the following structure: The upper clamping arm 21 has an arc-shaped clamping part at the front end for gripping the surface of the pipe 1, and a handle at the rear end. A shaft hole is provided at the position where the clamping part and the handle meet. An installation groove is provided on the lower surface of the handle of the upper clamping arm 21. The lower clamping arm 22 has a clamping part at the front end and a handle at the rear end. A shaft hole is provided at the position where the clamping part and the handle meet. A limit groove is provided on the upper surface of the handle of the lower clamping arm 22, and a limit rib is provided in the limit groove. The pivot shaft 27 passes through the shaft holes of the upper clamping arm 21 and the lower clamping arm 22. The outer end of the pivot shaft 27 is fixed with a nail head 2701, and the inner end is fixed with a shaft shoulder 2702. The nail head 2701 facilitates the installation of the pivot shaft 27 and cooperates with the shaft shoulder 2702 to fix the upper clamping arm 21 and the lower clamping arm 22.

[0029] The clamping support rod 23 is hinged at the upper end and installed at the front end of the mounting groove. A connecting groove is provided on the middle surface. A rivet is installed through the connecting groove. A second spring 24 is connected to the rivet. The other end of the second spring 24 is connected to the rear end of the mounting groove. The clamping wrench 25 includes a support rod, the upper end of which is hinged to the lower end of the clamping support rod 23. A wrench head is fixedly provided on the outer side of the upper end of the support rod. A limiting baffle that abuts against the surface of the clamping support rod 23 is provided at the front end of the wrench head. A support column is provided at the lower end of the support rod and is engaged in the limiting groove.

[0030] The clamping rod 23 and the clamping wrench 25 constitute the opening and closing support structure of the upper clamping arm 21 and the lower clamping arm 22, thereby increasing the clamping engagement of the clamping part with the pipe 1. The clamping rod 23 is used to connect with the upper clamping arm 21. The connecting groove is fitted with a second spring 24 by a rivet. The lower end is hinged to the clamping wrench 25. The rear end of the clamping wrench 25 is provided with a support column, which works in conjunction with the limiting groove of the lower clamping arm 22. By adjusting the position of the support column in the limiting groove, the opening size of the clamping clamp 2 can be changed to accommodate clamping pipes of different diameters. The wrench head allows for easy operation of the support structure. Pulling the wrench head outward causes the support structure to bend. At this time, the support position at the lower end of the clamping wrench 25 is adjustable. Then, pushing the wrench head inward, the clamping clamp 2 is locked when the limiting baffle contacts the clamping rod 23. This solution utilizes the clamping rod 23 and the clamping wrench 25 to fix the clamping force of the clamping pliers 2 on the pipe 1, which can stably grip the pipe 1 and facilitate operation.

[0031] The inner surface of the clamping part is provided with anti-slip texture 26.

[0032] This invention combines two clamping clamps together through a joint mechanism to form a fixed structure for the pipe. This device uses the pipe on one side as the mechanical basis to fix the position of the pipe on the other side, without the need for a separate structure for docking and fixing, thus protecting the stability of the docking point. This device is small in size, light in weight, easy to carry, and convenient to use.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A clamping and positioning device for pipe-to-pipe butt welding, comprising clamping clamps (2) for fixing a pipe (1), the clamping clamps (2) comprising an upper clamping arm (21) and a lower clamping arm (22), the two clamping arms being connected by a pivot shaft (27), and two clamping clamps (2) being provided, characterized in that, A joint mechanism (3) is provided between the two clamping clamps (2). The joint mechanism (3) combines the two clamping clamps (2) and is used to adjust the relative angle of the two clamping clamps (2). The joint mechanism (3) includes a connecting rod 1 (31) and a connecting rod 2 (32) arranged coaxially. The ends of the connecting rod 1 (31) and the connecting rod 2 (32) are rotatably engaged. A spline rod (33) is provided on the end face of the end face of the connecting rod 1 (31) and a spline groove (34) is fixedly connected to the end face of the end face of the connecting rod 2 (32). The spline rod (33) is inserted into the spline groove (34). Several guide rods (35) are evenly arranged circumferentially on the end surfaces of the connecting rod 1 (31) and the connecting rod 2 (32). The two ends of the first spring (36) are respectively connected to the guide rods (35) on the connecting rod 1 (31) and the connecting rod 2 (32), thereby connecting the connecting rod 1 (31) and the connecting rod 2 (32). The clamping pliers (2) include: The upper clamping arm (21) has an arc-shaped clamping part at the front end for gripping the surface of the pipe (1) and a handle at the rear end. A shaft hole is provided at the position where the clamping part and the handle meet. An installation groove is provided on the lower surface of the handle of the upper clamping arm (21). The lower clamping arm (22) has a clamping part at the front end and a handle at the rear end. A shaft hole is provided at the position where the clamping part and the handle meet. A limit groove is provided on the upper surface of the handle of the lower clamping arm (22), and a limit rib is provided in the limit groove. A pivot shaft (27) passes through the shaft holes of the upper clamping arm (21) and the lower clamping arm (22). A nail head (2701) is fixed to the outer end of the pivot shaft (27), and a shaft shoulder (2702) is fixed to the inner end. The clamping support rod (23) is hinged at the front end of the mounting groove, and a connecting groove is provided on the middle surface. A rivet is installed through the connecting groove, and a second spring (24) is connected to the rivet. The other end of the second spring (24) is connected to the rear end of the mounting groove. The clamping wrench (25) includes a support rod, the upper end of which is hinged to the lower end of the clamping support rod (23). A wrench head is fixedly provided on the outer side of the upper end of the support rod. A limiting baffle that abuts against the surface of the clamping support rod (23) is provided at the front end of the wrench head. A support column is provided at the lower end of the support rod and is engaged in the limiting groove.

2. The clamping and positioning device for pipe-to-pipe butt welding according to claim 1, characterized in that, Positioning protrusions are provided on the near end surface of connecting rod one (31), and angle scale marks corresponding to the spline groove (34) are provided on the near end surface of connecting rod two (32).

3. The clamping and positioning device for pipe-to-pipe butt welding according to claim 1, characterized in that, The ends of connecting rod one (31) and connecting rod two (32) that are far apart are respectively fixedly connected to the surfaces of the pivot shafts (27) of the two clamping pliers (2).

4. The clamping and positioning device for pipe-to-pipe butt welding according to claim 1, characterized in that... The combined mechanism (3) is provided with swing mechanisms at both ends, which are connected to the pivot shafts (27) of the two clamping clamps (2). The swing mechanisms include: Turbine blade (301) is fixedly mounted at the end of the combined mechanism (3), and angle scale is provided on the outer edge of its front surface; The connecting seat (302) is fixedly set on the surface of the pivot shaft (27), and its outer end is connected to the center of the turbine blade (301) through the rotating shaft (304). The surface is provided with a window, and a pointer is provided in the window to point to the scale. The worm gear (303) is installed inside the connecting seat (302), and its two ends are rotatably connected to the connecting seat (302) and mesh with the turbine blade (301).

5. The clamping and positioning device for pipe-to-pipe butt welding according to claim 1, characterized in that, The inner surface of the clamping part is provided with anti-slip texture (26).

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