A radial load loading mechanism and test device for pipe bending test

Abstract

The present application belongs to the field of pipeline bending test, and particularly relates to a radial load loading mechanism for pipeline bending test and a test device. The radial load loading mechanism for pipeline bending test comprises a radial load loading structure, a support structure and a pipeline mounting structure. The support structure is arranged in a test area. The upper end of the support structure is fixedly connected with one end of the radial load loading structure. The other end of the radial load loading structure is fixedly connected with the pipeline mounting structure. The pipeline mounting structure is used for fixedly connecting a pipeline. The radial load loading structure is horizontally arranged, so that the radial load loading structure can move horizontally to load radial load on the pipeline. The radial load loading structure is horizontally arranged, so that the spatial layout is reasonable and the workers can operate more conveniently.

Description

Technical Field

[0001] This invention belongs to the field of pipeline bending tests, specifically relating to a radial load loading mechanism and testing device for pipeline bending tests. Background Technology

[0002] Offshore pipelines are the lifeline for the development of offshore oil and gas resources, playing a crucial role in the extraction and transportation of these resources. However, when laying offshore pipelines, pipelaying vessels need to lower or raise the pipelines in seawater. Due to factors such as the pipeline's own weight, the drag force of seawater caused by changes in wave currents, and seabed topography, the pipeline will be subjected to a large bending moment and undergo bending deformation. This necessitates that the pipeline undergo bending tests before entering the water to ensure that its strain performance, fatigue resistance, and other properties meet the operational requirements.

[0003] Pipeline bending test is a test that uses a specific device to apply axial load and radial loads in both directions to a complete section of marine pipeline to simulate the actual stress conditions of marine pipeline. At the same time, the bending radius, strain and other relevant parameters of the pipeline are measured during the test to ensure that the marine pipeline meets the operational requirements.

[0004] Chinese patent application CN107515150A discloses a comprehensive testing device for the mechanical properties of marine pipelines. The technical solution of this application uses a vertical arrangement of hydraulic cylinders when applying radial loads, which results in inconvenience for workers and an unreasonable spatial layout.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] To address the technical problems existing in the prior art, the present invention provides a radial load loading mechanism and testing device for pipe bending tests. The present invention uses a horizontal radial load loading structure for radial load loading, which has a reasonable spatial layout and is more convenient for workers to operate.

[0007] This invention includes the following technical solutions:

[0008] The first aspect of the present invention provides a radial load loading mechanism for a pipe bending test, comprising a radial load loading structure, a support structure, and a pipe mounting structure. The support structure is used to be installed in the test area. One end of the radial load loading structure is fixedly connected to the upper end of the support structure, and the other end of the radial load loading structure is fixedly connected to the pipe mounting structure. The pipe mounting structure is used to fix and connect the pipe. The radial load loading structure is horizontally arranged, so that the radial load loading structure can move back and forth horizontally to apply a radial load to the pipe.

[0009] Furthermore, a movable structure is provided at the bottom of the support structure, and the support structure is set in the test area through the movable structure. The movable structure is used to drive the support structure to move back and forth in the axial direction of the pipeline.

[0010] Furthermore, the movable structure is connected to two supporting structures, the upper ends of the two supporting structures are respectively connected to one end of the two radial load loading structures, and the other ends of the two radial load loading structures are respectively connected to two pipe installation structures; both radial load loading structures are horizontally arranged, so that both radial load loading structures can move back and forth horizontally to apply radial loads to the pipes.

[0011] Furthermore, the moving structure drives the two supporting structures to move along the pipe axis.

[0012] Furthermore, the support structure includes a support frame and a base plate. The lower end of the base plate is used to be set in the test area, and the upper end is fixedly connected to the lower end of the support frame. The upper end of the support frame is fixedly connected to the radial load loading structure.

[0013] Furthermore, the pipe installation structure includes a support base and a pipe clamp. One end of the support base is fixedly connected to a radial load loading structure, and the other end is provided with a first connecting groove. The pipe clamp is rotatably connected in the first connecting groove, and the pipe clamp is used to connect the pipe.

[0014] Furthermore, the pipe clamp includes a first mold base and a second mold base. The upper and lower ends of the first mold base are rotatably connected in the first connecting groove. A first arc-shaped groove is provided in the middle of the first mold base. A second arc-shaped groove is provided in the middle of the second mold base. The second mold base is fixedly connected to the first mold base, so that the first arc-shaped groove and the second arc-shaped groove are connected to clamp the pipe.

[0015] A second aspect of the present invention provides a pipe four-point bending test device, including the radial load loading mechanism described above.

[0016] Furthermore, it also includes a support follower mechanism, which is used to support and limit the middle part of the pipeline, and the radial load loading mechanism applies a radial load to the pipeline located on opposite sides of the support follower mechanism.

[0017] Furthermore, the support follow-up mechanism includes a bottom slide rail, a first limiting seat, a second limiting seat, and an adjusting screw. The bottom slide rail is used to be set in the test area. The lower ends of the first and second limiting seats are slidably set on the bottom slide rail at intervals. The upper ends of the first and second limiting seats are fixedly connected by the adjusting screw. During the pipe bending test, the middle part of the pipe is set between the first and second limiting seats, and the pipe can drive the first and second limiting seats to move back and forth along the radial direction of the pipe.

[0018] By adopting the above technical solution, the present invention has the following advantages:

[0019] 1. The present invention uses a horizontal radial load loading structure for radial load loading, which has a reasonable spatial layout and makes it easier for workers to operate.

[0020] 2. This invention transmits the radial load from the pipe installation structure to the pipe by setting the radial load loading structure to move back and forth horizontally. The radial load loading will not be affected by the gradual bending of the pipe. The movement is flexible, the control precision is high, and the possibility of rigid damage to the components is small.

[0021] 3. The test device of the present invention can realize the four-point bending test of the pipeline, so that the bending of the pipeline is a pure bending, which has the advantage of improving the accuracy of the test.

[0022] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention can be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a radial load loading mechanism for a pipe bending test according to an embodiment of the present invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of a radial load loading mechanism for a pipe bending test according to an embodiment of the present invention. Figure 2 ;

[0026] Figure 3 This is a schematic diagram of a radial load loading mechanism for a pipe bending test according to an embodiment of the present invention. Figure 3 ;

[0027] Figure 4 This is a cross-sectional view of a radial load loading mechanism for a pipe bending test according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the pipe clamp structure in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the first mold base in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of the second mold base in an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the structure of the first mold in an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of the structure of a four-point bending test device for a pipeline according to an embodiment of the present invention;

[0033] Figure 10 This is a schematic diagram of the structure supporting the follower mechanism in an embodiment of the present invention;

[0034] In the figure, 6-radial load loading mechanism, 61-radial load loading structure, 62-support structure, 621-support frame, 622-base plate, 63-pipe installation structure, 631-support seat, 6311-first connecting groove, 64-moving structure, 7-support follow-up mechanism, 71-bottom slide rail, 72-first limit seat, 73-second limit seat, 74-adjusting screw, 3-universal wheel, 4-pipe clamp, 41-first mold base, 411-first arc groove, 42-second mold base, 421-second arc groove, 5-first mold, 8-slewing bearing. Detailed Implementation

[0035] The following description provides many different embodiments or examples for implementing various features of the invention. The elements and arrangements described in the specific examples below are only for concise expression of the invention and are merely examples, not intended to limit the invention.

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] The first aspect of this embodiment provides a radial load loading mechanism for pipe bending tests, such as... Figure 1 , Figure 2As shown, the system includes a radial load loading structure 61, a support structure 62, and a pipe installation structure 63. The support structure 62 is installed in the test area. One end of the radial load loading structure 61 is fixedly connected to the upper end of the support structure 62, and the other end of the radial load loading structure 61 is fixedly connected to the pipe installation structure 63. The pipe installation structure 63 is used to fix and connect the pipe. The radial load loading structure 61 is horizontally arranged, allowing it to move back and forth horizontally to apply a radial load to the pipe.

[0038] In some embodiments, the radial load loading structure 61 is a hydraulic cylinder. The radial load loading structure 61 performs a telescopic movement to push or pull the middle of the pipe in the radial direction. Preferably, the radial load loading structure 61 has a built-in displacement sensor to detect the stroke of the radial load loading structure 61.

[0039] In some embodiments, a movable structure 64 is provided at the bottom of the support structure 62, and the support structure 62 is positioned in the test area via the movable structure 64. The movable structure 64 is used to drive the support structure 62 to move back and forth in the axial direction of the pipe. Figure 4 As shown, to more clearly illustrate the movable structure 64, the support structure 62 is not connected to the movable structure in the figure.

[0040] In some embodiments, the movable structure 64 is connected to two support structures 62, the upper ends of the two support structures 62 are respectively connected to one end of the two radial load loading structures 61, and the other ends of the two radial load loading structures 61 are respectively connected to two pipe mounting structures 63; the two radial load loading structures 61 are both horizontally arranged, so that the two radial load loading structures 61 can move back and forth horizontally to apply radial loads to the pipes.

[0041] In some embodiments, when two sets of radial load loading structures 61, support structures 62 and pipe installation structures 63 are provided, preferably, the two support structures 62 can move simultaneously to ensure that the center position of the pipe remains basically unchanged when the radial load is applied.

[0042] In some embodiments, the movable structure 64 drives the two support structures 62 to move along the pipe axis.

[0043] In some embodiments, the support structure 62 includes a support frame 621 and a base plate 622. The lower end of the base plate 622 is used to be set in the test area, and the upper end is fixedly connected to the lower end of the support frame 621. The upper end of the support frame 621 is fixedly connected to the radial load loading structure 61.

[0044] like Figure 4As shown, the support frame 621 is connected to the base plate 622 through the slewing bearing 8, which allows the support frame 621 to rotate to adapt to the angle change when the radial load is applied, avoiding rigid damage and extending service life; at the same time, the rotation of the support frame 621 also allows the radial load loading mechanism 61 to change angle with the bending deformation of the pipeline, ensuring the accuracy of the applied radial load, thereby improving the accuracy of the test.

[0045] In some embodiments, the movable structure 64 includes a slide rail and a slider slidably disposed on the slide rail, with a support structure 62 fixedly connected above the slider, thereby driving the support structure 62 to move. This structural design is advantageous for the radial load loading mechanism to hold the pipe in position, adapting to tests on pipes of different lengths. For example, one movable structure 64 can simultaneously support and move two sets of radial load loading structures 61, support structures 62, and pipe mounting structures 63; alternatively, two movable structures 64 can separately support and move two sets of radial load loading structures 61, support structures 62, and pipe mounting structures 63.

[0046] The slider can be driven by a worm screw jack or a hydraulic cylinder. The worm screw jack is driven by a geared motor, and the hydraulic cylinder is driven by a compressor.

[0047] In some embodiments, such as Figure 4 As shown, the pipe installation structure 63 includes a support base 631 and a pipe clamp 4. One end of the support base 631 is fixedly connected to the radial load loading structure 61, and the other end is provided with a first connecting groove 6311. The pipe clamp 4 is rotatably connected in the first connecting groove 6311. The pipe clamp 4 is used to connect pipes.

[0048] In some embodiments, the pipe clamp 4 is rotatably mounted on the support 631 by means of a pin-type sensor; the pipe bending force, i.e., the radial load applied to the pipe, is measured by the pin-type sensor.

[0049] In some embodiments, such as Figure 5-7 As shown, the pipe clamp 4 includes a first mold base 41 and a second mold base 42. The upper and lower ends of the first mold base 41 are rotatably connected within the first connecting groove 6311. A first arc-shaped groove 411 is provided in the middle of the first mold base 41. A second arc-shaped groove 421 is provided in the middle of the second mold base 42. The second mold base 42 is fixedly connected to the first mold base 41, so that the first arc-shaped groove 411 and the second arc-shaped groove 421 are connected to clamp the pipe. For example, the first mold base 41 is first fixed on the support base 631, then the pipe is assembled on the first mold base 41, and finally the second mold base 42 is connected to fix the pipe.

[0050] In some embodiments, such as Figure 8As shown, it also includes a first mold 5; half of the first mold 5 is shown in the figure. The first mold 5 includes at least two as shown in the figure, which are respectively used to connect in the first arc groove 411 and the second arc groove 421. In this way, by setting the first mold 5 of different sizes, it can be adapted to pipes of different diameters to meet the bending test of pipes of different diameters, thereby improving the application range of the device of the present invention.

[0051] In the structure of this invention, the support base 631 can be suspended, but such a structure only provides support through the support frame 621, making the support frame 621 prone to damage and also hindering the radial load loading structure 61 from loading radial loads; therefore, in some embodiments, such as Figure 4 As shown, the bottom end of the support base 631 is provided with a caster wheel 3, which is slidably mounted on the base plate 622. This facilitates the movement of the pipe installation structure 63 and also provides support for the pipe installation structure 63. It has the advantages of increasing the service life of the support frame 621 and improving the accuracy of the radial load, thereby improving the accuracy of the test.

[0052] The second aspect of this embodiment also provides a pipe four-point bending test device, such as... Figure 9 As shown, it includes the radial load loading mechanism 6 described above. It should be noted that the four-point bending test should be understood as simultaneously applying two radial loads and two axial loads at both ends, making the pipe bend a pure bending.

[0053] In some embodiments, such as Figure 9 As shown, it also includes a support follower mechanism 7, which is used to support and limit the middle part of the pipe, and the radial load loading mechanism 6 applies radial load to the pipe located on opposite sides of the support follower mechanism 7.

[0054] In some embodiments, such as Figure 10 As shown, the support follow-up mechanism 7 includes a bottom slide rail 71, a first limiting seat 72, a second limiting seat 73, and an adjusting screw 74. The bottom slide rail 71 is used to be set in the test area. The lower ends of the first limiting seat 72 and the second limiting seat 73 are slidably set on the bottom slide rail 71 at intervals. The upper ends of the first limiting seat 72 and the second limiting seat 73 are fixedly connected by the adjusting screw 74. During the pipe bending test, the middle part of the pipe is set between the first limiting seat 72 and the second limiting seat 73. The pipe can drive the first limiting seat 72 and the second limiting seat 73 to move back and forth along the radial direction of the pipe. Specifically, when the radial load loading mechanism 6 applies a radial load to the pipe by pushing and pulling, the pipe bending causes the first limiting seat 72 and the second limiting seat 73 to move back and forth along the radial direction of the pipe.

[0055] For example, the distance between the first limit seat 72 and the second limit seat 73 can be adjusted by adjusting the lead screw 74 to accommodate tests on different pipelines.

[0056] Preferably, the bottom slide rail 71 has an "I" shaped cross section, and the bottom ends of the first limiting seat 72 and the second limiting seat 73 are provided with sliding clips. The first limiting seat 72 and the second limiting seat 73 are engaged with the "I" shaped slide rail by the sliding clips to slide.

[0057] In some embodiments, the first limiting seat 72 and the second limiting seat 73 are each provided with a second mold with an arc-shaped surface on the side close to each other. The second mold can, on the one hand, limit the bending deformation of the middle part of the pipe to the arc-shaped surface, so that the bending deformation of the middle part of the pipe fits the second mold, thereby ensuring the uniform deformation of the sample and obtaining more complex and accurate test data; on the other hand, different pipes can be tested by changing the second mold of different specifications.

[0058] It should be noted that the test area described in this invention should be understood as the area where the four-point bending test of the pipeline will be performed, which can be, for example... Figure 9 The pipe four-point bending test device shown is a device that integrates the radial load loading mechanism 6 of the present invention into a whole; alternatively, a test area can be set up in a space, such as a dedicated test chamber, and the radial load loading mechanism 6 can be arranged in the test chamber.

[0059] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0060] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of multiple components or the interaction between multiple components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0061] In the description of this invention, it should be understood that all terms used to indicate orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to 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 should not be construed as a limitation of this invention.

[0062] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A radial load loading mechanism for pipe bending tests, characterized in that, The test includes a radial load loading structure (61), a support structure (62), and a pipe installation structure (63). The support structure (62) is used to be set in the test area. The upper end of the support structure (62) is fixedly connected to one end of the radial load loading structure (61), and the other end of the radial load loading structure (61) is fixedly connected to the pipe installation structure (63). The pipe installation structure (63) is used to fix and connect the pipe. The radial load loading structure (61) is horizontally arranged so that the radial load loading structure (61) can move back and forth horizontally to apply radial load to the pipe.

2. The radial load loading mechanism for pipe bending tests according to claim 1, characterized in that, The bottom of the support structure (62) is provided with a movable structure (64), and the support structure (62) is set in the test area through the movable structure (64). The movable structure (64) is used to drive the support structure (62) to move back and forth in the axial direction of the pipeline.

3. A radial load loading mechanism for pipe bending test according to claim 2, wherein the movable structure (64) is connected to two support structures (62), the upper ends of the two support structures (62) are respectively connected to one end of the two radial load loading structures (61), and the other ends of the two radial load loading structures (61) are respectively connected to two pipe installation structures (63); the two radial load loading structures (61) are both horizontally arranged so that the two radial load loading structures (61) can move back and forth horizontally to apply radial load to the pipe.

4. The radial load loading mechanism for pipe bending tests according to claim 3, characterized in that, The movable structure (64) drives the two support structures (62) to move along the pipe axis.

5. A radial load loading mechanism for pipe bending tests according to claim 1, characterized in that, The support structure (62) includes a support frame (621) and a base plate (622). The lower end of the base plate (622) is used to be set in the test area, and the upper end is fixedly connected to the lower end of the support frame (621). The upper end of the support frame (621) is fixedly connected to the radial load loading structure (61).

6. A radial load loading mechanism for pipe bending tests according to any one of claims 1-5, characterized in that, The pipe installation structure (63) includes a support base (631) and a pipe clamp (4). One end of the support base (631) is fixedly connected to a radial load loading structure (61), and the other end is provided with a first connecting groove (6311). The pipe clamp (4) is rotatably connected in the first connecting groove (6311). The pipe clamp (4) is used to connect pipes.

7. A radial load loading mechanism for pipe bending tests according to claim 6, characterized in that, The pipe clamp (4) includes a first mold base (41) and a second mold base (42). The upper and lower ends of the first mold base (41) are rotatably connected in the first connecting groove (6311). A first arc-shaped groove (411) is provided in the middle of the first mold base (41). A second arc-shaped groove (421) is provided in the middle of the second mold base (42). The second mold base (42) is fixedly connected to the first mold base (41), so that the first arc-shaped groove (411) and the second arc-shaped groove (421) are connected to clamp the pipe.

8. A pipe four-point bending test device, characterized in that, Includes the radial load loading mechanism as described in any one of claims 1-7.

9. A pipe four-point bending test device according to claim 8, characterized in that, It also includes a support follower mechanism (7), which is used to support and limit the middle part of the pipeline, and the radial load loading mechanism applies radial load to the pipeline located on opposite sides of the support follower mechanism (7).

10. A pipe four-point bending test device according to claim 9, characterized in that, The support follow-up mechanism (7) includes a bottom slide rail (71), a first limiting seat (72), a second limiting seat (73), and an adjusting screw (74). The bottom slide rail (71) is used to be set in the test area. The lower ends of the first limiting seat (72) and the second limiting seat (73) are slidably set on the bottom slide rail (71) at intervals. The upper ends of the first limiting seat (72) and the second limiting seat (73) are fixedly connected by the adjusting screw (74). During the pipe bending test, the middle part of the pipe is set between the first limiting seat (72) and the second limiting seat (73). The pipe can drive the first limiting seat (72) and the second limiting seat (73) to move back and forth along the radial direction of the pipe.

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