Pipeline welding anti-deformation device

Abstract

The pipeline welding anti-deformation device is used for supporting a mother pipe for welding, the mother pipe is a long and thin pipe fitting, the device comprises a base frame, a plurality of pairs of clamps and a jacking device, and the base frame comprises a bearing part used for bearing the mother pipe; the multiple pairs of clamps are arranged on the base frame and used for clamping and fixing a mother pipe. The jacking device is used for being supported on the opposite side of the welding position of the main pipe and the branch pipe. According to the pipeline welding anti-deformation device, the mode that the multiple clamps are matched with the jacking device is adopted, the rigid fixing method principle is utilized, the clamps fix the slender mother pipe at the two ends, the jack supports the mother pipe at the middle welding stress position, deformation caused by thermal expansion and cold contraction of materials in the welding process can be avoided, and therefore welding stress is effectively reduced, and the welding quality is improved. The problem that a long and thin pipeline is prone to deformation and bending is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipe welding, in particular to a welding anti-deformation device. BACKGROUND

[0002] Pipe branch welding mainly includes fixed support welding, eyeing tee welding and BOSS head welding. In the welding process, the main pipe is prone to internal stress due to the thermal expansion and cold contraction and elastic-plastic deformation characteristics of the material. Stress and welding deformation generally exist at the same time and are mutually restrictive. The metal in the weld zone heated to high temperature bears compressive stress because its free elongation is limited by the free elongation of the low-temperature metal on both sides, and when the compressive stress exceeds the yield point, compression plastic deformation occurs, and the metal outside the weld zone needs to bear tensile stress, so the entire plate exists compressive stress and tensile stress that interact with each other. When the rigidity of the structure is small, the pipe can expand and contract relatively freely during welding, so the welding stress is small and the deformation is large.

[0003] Chinese patent CN210099384 discloses a pipe platform welding anti-deformation tool. The pipe to be welded is placed in three clamping frames, the arc plates on the top plate and the two side plates are used to position and clamp the pipe, the arc plates on the bottom plate are used to support the pipe, and a jack located inside the pipe welding part is used to support the pipe wall. The component is made to produce plastic deformation in the opposite direction of the welding deformation by using external force. However, this structure has the following problems: for thin-walled, small-diameter and long pipe fittings, it is difficult to install the jack inside the pipe and difficult to disassemble it from the inside of the pipe, and the pipe wall is easily damaged during disassembly. At the same time, for slender pipe fittings, the rigidity is small, and the risk of bending deformation is high. SUMMARY

[0004] An object of the present application is to provide a pipe welding anti-deformation device that can effectively prevent deformation of a slender pipe during welding.

[0005] The pipe includes a welded parent pipe and a branch pipe, and the parent pipe is a slender pipe fitting. The pipe welding anti-deformation device for achieving the above object includes a base frame, a plurality of pairs of clamps and a jacking device. The base frame includes a bearing part for supporting the parent pipe. The plurality of pairs of clamps are arranged on the base frame and used to clamp and fix the parent pipe. The jacking device is used to support the opposite side of the parent pipe and the branch pipe at the welding position.

[0006] In one or more embodiments, the fixed clamps include a screw rod penetrating through the base frame and a clamping block located at the end of the screw rod, and the screw rod is threadedly connected with the base frame.

[0007] In one or more embodiments, each of the fixed clamps is arranged to extend in different radial directions of the parent pipe.

[0008] In one or more embodiments, the clamping blocks are arc-shaped clamping blocks or U-shaped clamping blocks.

[0009] In one or more embodiments, one of the pair of the fixing clamps comprises a screw rod penetrating through the base frame and a clamping block at the end of the screw rod, the screw rod being threadedly connected with the base frame, and the other comprises a clamping block fixed on the base frame.

[0010] In one or more embodiments, the device further comprises a cross arm supporting the jacking device, the cross arm being movably arranged on the base frame.

[0011] In one or more embodiments, the base frame comprises a stand and a plurality of beams, and part of the beams constitute the bearing part.

[0012] In one or more embodiments, the stand and the beams at the top of the stand are arranged in detachable connection to form an opening.

[0013] In one or more embodiments, the jacking device is a jack, and the female pipe is an elongated pipe.

[0014] In one or more embodiments, the clamps are replaceably arranged on the base frame.

[0015] The pipe welding anti-deformation device adopts the mode of cooperation of a plurality of clamps with a jacking device, utilizes the principle of rigid fixation, fixes the elongated female pipe at both ends by the clamps, and supports the female pipe at the welding receiving force in the middle by the jack, thereby not only increasing the support contact area, but also avoiding the deformation caused by thermal expansion and cold contraction of the material during welding. After the welding is completely cooled, the welded part is released, and the deformation of the welded part is smaller than that in the free state during welding, thereby effectively reducing the welding stress and solving the problems of deformation and bending easily caused by the elongation of the pipe. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other features, properties, and advantages of the present application will become more apparent by the following description with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 is a schematic view of a pipe welding anti-deformation device;

[0018] Figure 2 is a schematic view of an embodiment of a clamp;

[0019] Figure 3 is a schematic view of an embodiment of a screw rod;

[0020] Figure 4 is a schematic view of an embodiment of a cross arm;

[0021] Figure 5This is a schematic diagram of the connection structure between the uprights and the crossbeams.

[0022] Attached figure labels

[0023] 11. Base frame

[0024] 12 Fixtures

[0025] 13 Lifting Device

[0026] 14 Crossbeams

[0027] 110 scaffolding

[0028] 112 Crossbeam

[0029] 113 Pin

[0030] 115 Bearing section

[0031] 121 Screw

[0032] 122 Clamping Block

[0033] 123 Horizontal bar

[0034] 1120 Top beam Detailed Implementation

[0035] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0036] It should be noted that these and other accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the scope of protection of the present invention.

[0037] like Figure 1 As shown, the pipe welding anti-deformation device is used to support the pipe to be welded. More specifically, the pipe includes a main pipe and branch pipes to be welded, and the main pipe is preferably a slender pipe fitting. For example, the diameter of the main pipe ranges from 88.9 to 273.1 mm, and the wall thickness ranges from 3.05 to 8.74 mm.

[0038] The device includes a base frame 11, multiple pairs of clamps 12, and a lifting device 13. The base frame 11 includes a support portion 115 for supporting the main pipe. Figure 1In the illustrated embodiment, the base frame 11 includes a vertical frame 110 and multiple cross beams 112, forming two "曰"-shaped frames. Some of the cross beams 112 in the middle part constitute the bearing part 115 to bear the two ends of the mother pipe. As Figure 5 shown, the vertical frame 110 and the top cross beam 1120 located at the top of the vertical frame are assembled and connected through structures such as a pin shaft 113, which is convenient for disassembly.

[0039] The distance between the top cross beam and the bottom cross beam is determined according to the size of the workpiece, with the requirement of being able to fix both ends and leaving a certain welding operation space.

[0040] Multiple pairs of clamps 12 are arranged on the base frame and are used to clamp and fix the mother pipe at different positions, so that the mother pipe can maintain the correct position during the welding process, as Figure 2 and Figure 3 shown.

[0041] An embodiment of the fixed clamp includes a screw 121 passing through the base frame and a clamping block 122 located at the end of the screw. The screw 121 is threadedly connected to the base frame 11 to adjust the height of the clamping block 122. For example, multiple nuts and matching T-shaped screws 121 are installed on the top cross bar and the middle cross bar, and the clamp is installed at the end of the T-shaped screw. The upper and lower clamps are used together to fix the end of the mother pipe. <000,0097>

[0042] A cross bar 123 is provided at the end of the screw, which is convenient for rotating the screw. With the threaded connection of the screw to the cross beam, the bottom height can be adjusted, and the welded workpiece can be effectively fixed and is applicable to workpieces of different sizes.

[0043] Another embodiment of the fixed clamp is that one of a pair of fixed clamps includes a screw 121 passing through the base frame and a clamping block 122 located at the end of the screw. The screw 121 is threadedly connected to the cross beam 112 of the base frame, and the other only includes a clamping block 122 fixed to the base frame by means such as welding, as Figure 1 shown. The clamping block 122 and the screw 121 can also be of a split structure, such as being connected by a threaded structure. During installation, first place the clamping block 122 on the upper part of the workpiece, and rotate the screw until the end of the screw abuts against the screw hole of the upper half clamp to fix the welded workpiece. <000010,3> The clamping block 122 is an arc-shaped clamping block or a U-shaped clamping block. Preferably, the clamp matches the cross-sectional shape of the workpiece to increase the contact area between the clamp and the workpiece and avoid point or line stress. Further, an isolation gasket is added to the clamping block to avoid contaminating materials with special requirements such as stainless steel.

[0045] In some embodiments, the clamps are alternatively mounted on the base frame. By replacing different types of clamps, the device can be adapted to workpieces with various cross-sectional shapes, increasing the flexibility of the apparatus. Preferably, each fixed clamp is arranged to extend along different radial directions of the mother tube to increase the stability of the clamping.

[0046] Reference Figure 1 As shown, a jack or similar lifting device 13 is used to support the opposite side of the welded joint between the main pipe and the branch pipe, such as the bottom of the main pipe. The lifting device 13 is located on the outside of the slender main pipe. Compared to placing it inside the pipe, this not only facilitates installation and disassembly but also allows it to cooperate with multiple pairs of clamps 12, providing multi-point support for the slender pipe fitting, effectively preventing axial warping deformation at the ends of the slender welded fitting. Furthermore, the device can also support non-slender pipe fittings, demonstrating its versatility.

[0047] Continue to refer to Figure 4 As shown, the device also includes a crossbeam 14 supporting the lifting device 13, such as a square steel crossbeam with double channel steel. The crossbeam 14 is movably mounted on the base frame 11. The crossbeam 14 is used for bottom support and adjusting the height of the lifting device 13 to keep the lifting device 13 stable and level.

[0048] At this point, the lifting device and clamp 12 support the pipe fittings at multiple points on the slender mother pipe. During the welding process, the deformation of the mother pipe is observed and measured, and the lifting device is adjusted according to the direction and magnitude of the deformation. The length of the lifting device 13 can be adjusted according to actual needs.

[0049] This device reduces welding stress through a "rigid fixing method." The main pipe of the branch pipe is placed horizontally on an iron frame, and clamping blocks are installed at the ends of T-shaped screws, securing the main pipe to both ends. By screwing in the T-shaped screws, force is applied to both ends of the main pipe, thus fixing it in place. Simultaneously, a lifting device is placed on the square steel crossbeam at the bottom of the support. A clamp is installed on the top of the lifting device, clamping it on the opposite side of the weld between the main pipe and the branch pipe. This allows the lifting device to support the main pipe, increasing the support contact area and preventing deformation caused by thermal expansion and contraction of the material during welding. The branch pipe is clamped at both ends and lifted in the middle for welding. After welding is completed and the pipe has completely cooled, the main pipe is released. The deformation of the main pipe at this point is smaller than that occurring during welding in a free state, effectively preventing axial warping deformation at both ends during the branch pipe welding process.

[0050] In traditional techniques, a fixed frame structure is typically used at each connection point to ensure stability. The pipe welding anti-deformation device described in this invention features a detachable connection between the upright and the crossbeam at the top of the upright. This allows for flexible disassembly of the top of the device without affecting the stability of the supported pipe. When the top crossbeam is detached from the upright, the upright forms an open structure, facilitating the hoisting of the pipe and allowing the main pipe to be easily placed within the pipe welding anti-deformation device.

[0051] The following describes the process of using the device.

[0052] The crossbeams and uprights are fixed, with some crossbeams and uprights connected by welding, and the crossbeams and supports at the top of the uprights connected by pins.

[0053] First, place the lower half of a pair of clamps on the middle of the base frame. To facilitate welding and subsequent support work, position the welding point on the upper side of the mother pipe.

[0054] When it is necessary to place the main pipe, remove the pin to create an opening at the top of the stand, and then hoist and place the main pipe.

[0055] Place the mother tube on the clamping block of the fixture, which is used to position and clamp both ends of the mother tube.

[0056] Clamp the upper part of the fixing clamp onto the main pipe and tighten the T-bolt on the top of the base to secure the main pipe. Use jacks to fix the main pipe to the opposite side of the welding position between the main pipe and the branch pipe. Place a square steel crossbeam at the bottom of the support frame as a support point for the jacks. Place the jacks below the welding position on the main pipe, roughly adjust the jack height using the square steel crossbeam, and tighten the jack support.

[0057] Finally, the welding process is carried out.

[0058] The above-mentioned device has the following advantages: (1) It is easy to install and can fix the position of the branch pipe opposite the main pipe. The compressive stress generated by it offsets the tensile stress generated by welding, reduces the risk of warping deformation, and ensures the quality of welded pipe fittings; (2) The device can be flexibly disassembled and assembled, and can accommodate up to three sets of welding operations at the same time, improving construction efficiency, with strong operation convenience and high utilization efficiency; (3) For slender workpieces with different cross sections, the matching fixtures can be replaced, and the tooling has high versatility and reusability.

[0059] This application uses specific terms to describe embodiments of the application. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0060] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A pipe welding anti-deformation device, wherein the pipe includes a welded main pipe and branch pipes, characterized in that, The main pipe is a slender tube, and the device includes: The base frame includes a load-bearing section for supporting the main tube; Multiple pairs of clamps are mounted on the base frame for clamping and fixing the mother tube; and A lifting device is used to support the section where the main pipe and the branch pipe are welded together on the opposite side.

2. The pipe welding anti-deformation device as described in claim 1, characterized in that, The fixing fixture includes a screw that passes through the base frame and a clamping block located at the end of the screw, the screw being threadedly connected to the base frame.

3. The pipe welding anti-deformation device as described in claim 2, characterized in that, Each of the fixing clamps is configured to extend along different radial directions of the mother tube.

4. The pipe welding anti-deformation device as described in claim 2, characterized in that, The clamping block is an arc-shaped clamping block or a U-shaped clamping block.

5. The pipe welding anti-deformation device as described in claim 1, characterized in that, One of the pair of fixing clamps includes a screw extending through the base frame and a clamping block located at the end of the screw, the screw being threadedly connected to the base frame, and the other includes a clamping block fixed to the base frame.

6. The pipe welding anti-deformation device as described in claim 1, characterized in that, The device also includes a crossbeam supporting the lifting device, which is movably mounted on the base frame.

7. The pipe welding anti-deformation device as described in claim 1, characterized in that, The base frame includes uprights and multiple crossbeams, with some of the crossbeams forming the load-bearing part.

8. The pipe welding anti-deformation device as described in claim 7, characterized in that, The upright and the crossbeam located at the top of the upright are configured to be detachably connected to form an opening.

9. The pipe welding anti-deformation device as described in claim 1, characterized in that, The main pipe is a slender pipe.

10. The pipe welding anti-deformation device as described in claim 1, characterized in that, The clamp can be alternatively mounted on the base frame.

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