Axial load loading mechanism and test device for pipe bending test

Abstract

The application belongs to the field of pipeline bending test, and particularly relates to an axial load loading mechanism and a test device for pipeline bending test. The axial load loading mechanism for pipeline bending test comprises a fixed assembly and a moving assembly. The fixed assembly comprises a first fixing base and a second fixing base. The moving assembly comprises a first swing arm and an axial loading structure. The first fixing base is arranged in a test area. One side of the first fixing base is rotatably connected to one end of the first swing arm. The other end of the first swing arm is rotatably connected to the axial loading structure. The lower end of the axial loading structure is rotatably connected to the second fixing base. The second fixing base is arranged in the test area. The moving mechanism can follow the deformation of the pipeline when the radial load is applied, so that the axial load applied to the pipeline is accurate, and the accuracy of the test parameters is improved. Meanwhile, the moving assembly can adapt to the axial load loading of pipelines with different lengths, and the use range of the axial load loading mechanism is improved.

Description

Technical Field

[0001] This invention belongs to the field of pipeline bending tests, specifically relating to an axial 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 CN10751515A discloses a comprehensive testing device for the mechanical properties of marine pipelines. However, in the pipeline bending test, there is a situation where radial load and axial load are applied simultaneously. As a result, the device cannot guarantee the precise application of axial load, leading to poor accuracy of the parameters obtained from the test.

[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 an axial load loading mechanism and testing device for pipe bending tests. The axial load loading mechanism of the present invention, by setting an action mechanism, can follow the deformation of the pipe when a radial load is applied, thereby applying a precise axial load to the pipe and improving the accuracy of the test parameters. At the same time, by setting a moving component, it can adapt to the axial load loading of pipes of different lengths, thus improving the application range of the axial load loading mechanism.

[0007] This invention includes the following technical solutions:

[0008] The first aspect of the present invention provides an axial load loading mechanism for a pipe bending test, comprising a fixing component, an actuating component, and a moving component. The fixing component includes a first fixing seat and a second fixing seat. The actuating component includes a first swing arm and an axial loading structure. The first fixing seat is fixedly disposed in the test area. One side of the first fixing seat is rotatably connected to one end of the first swing arm. The other end of the first swing arm is rotatably connected to the axial loading structure. The lower end of the axial loading structure is rotatably connected to the second fixing seat. The second fixing seat is fixedly disposed in the test area.

[0009] The first swing arm has a connection position in the middle for rotating and connecting the pipe clamp; in the pipe bending test, the axial loading structure can apply axial load to the pipe held by the pipe clamp.

[0010] The movable component is used to drive the fixed component to move in the axial direction of the pipe.

[0011] Furthermore, the first swing arm includes a first swing part and a second swing part arranged vertically. One end of the first swing part is rotatably connected to the first fixed seat, and the other end is fixedly connected to one end of the second swing part. The other end of the second swing part is rotatably connected to the axial loading structure. A connecting groove is provided at the corner where the first swing part and the second swing part connect, and a connecting hole for connecting a pipe clamp is provided in the connecting groove.

[0012] Furthermore, a first limiting boss is provided in the connecting groove, which is used to limit the rotation of the pipe clamp.

[0013] Furthermore, a caster wheel is provided at the bottom end of the first swing arm.

[0014] Furthermore, a pipe clamp is rotatably connected within the connecting groove.

[0015] 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 connected to the connecting hole via pins. 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.

[0016] Furthermore, it also includes a fixed base plate, the lower end of the first swing arm is disposed on the fixed base plate, and the fixed base plate is used to fix it in the test area.

[0017] Furthermore, the axial loading structure includes a second support part and an axial load loading part. The lower end of the second support part is rotatably connected to the second fixed seat, and the upper end is fixedly connected to one end of the axial load loading part. The other end of the axial load loading part is rotatably connected to the first swing arm.

[0018] Furthermore, the second support portion is connected to the second fixed seat via the first slewing bearing.

[0019] A second aspect of the present invention provides a pipe bending test apparatus, including the axial load loading mechanism described above.

[0020] By adopting the above technical solution, the present invention has the following advantages:

[0021] 1. The present invention, through the design of the actuating component, enables it to move with the deformation of the pipeline when a radial load is applied, thereby applying a precise axial load to the pipeline and improving the accuracy of the parameters obtained in the test; at the same time, the setting of the moving component can adapt to the axial load loading of pipelines of different lengths, thus improving the application range of the axial load loading mechanism.

[0022] 2. When the axial load loading mechanism of the present invention is used for pipe bending tests, it can apply axial load in a horizontal position, with a reasonable spatial layout, making it easier for workers to operate.

[0023] 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

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the axial load loading mechanism used for pipe bending tests in an embodiment of the present invention. Figure 1 ;

[0026] Figure 2 This is a partial structural schematic diagram of the axial load loading mechanism used for pipe bending tests in an embodiment of the present invention;

[0027] Figure 3 for Figure 2 Sectional view along line AA;

[0028] Figure 4 This is a schematic diagram of the axial load loading mechanism used for pipe bending tests in an embodiment of the present invention. Figure 2 ;

[0029] Figure 5 This is a schematic diagram of the pipe clamp structure in an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the first mold base in an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the second mold base in an embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the mold structure in an embodiment of the present invention;

[0033] Figure 9 This is a schematic diagram of the pipe bending test device in an embodiment of the present invention;

[0034] In the figure, 1-axial load loading mechanism, 11-fixed component, 111-first fixed seat, 112-second fixed seat, 12-action component, 121-first swing arm, 1211-first swing part, 1212-second swing part, 1213-connecting groove, 122-axial loading structure, 123-first limiting boss, 1221-second support part, 1222-axial load loading part, 13-moving component, 2-fixed base plate, 3-universal wheel, 4-pipe clamp, 41-first mold base, 411-first arc groove, 42-second mold base, 421-second arc groove, 5-mold. 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] In pipe bending tests, axial and radial loads need to be applied to the pipe simultaneously. The axial load is a normal force applied along the pipe's axis (i.e., the force is perpendicular to the axial end face of the pipe), and the radial load is a normal force applied along the pipe's radial direction. In actual use, when a pipe is subjected to a radial load, it will not only bend and deform but also displace. However, in existing testing devices, the structure used to apply the axial load fixes both ends of the pipe, making it difficult for the pipe to move during the test, resulting in poor accuracy of the test data. Moreover, after the pipe is displaced, the direction of the applied axial load will change. If the mechanism applying the axial force cannot move, it is also impossible to guarantee the application of an accurate axial load, which will also lead to poor accuracy of the test data.

[0038] This embodiment provides an axial load loading mechanism 1 for pipe bending tests, such as... Figure 1-2 As shown, the device includes a fixing component 11, an actuating component 12, and a moving component 13. The fixing component 11 includes a first fixing seat 111 and a second fixing seat 112. The actuating component 12 includes a first swing arm 121 and an axial loading structure 122. The first fixing seat 111 is fixedly mounted in the test area. One side of the first fixing seat 111 is rotatably connected to one end of the first swing arm 121, and the other end of the first swing arm 121 is rotatably connected to the axial loading structure 122. The lower end of the axial loading structure 122 is rotatably connected to the second fixing seat 112, which is fixedly mounted in the test area. The middle of the first swing arm 121 is provided with a connection position for rotatably connecting the pipe clamp 4. It should be noted that the connection position can be a connecting groove 1213 provided on the first swing arm 121. In the pipe bending test, the axial loading structure 122 can apply an axial load to the pipe held by the pipe clamp 4. The moving component 13 is used to drive the fixing component 11 to move in the axial direction of the pipe. By setting the movable component 13, the axial load loading mechanism 1 of the present invention can realize the axial load loading of pipes of different lengths, thereby improving the application range of the axial load loading mechanism 1.

[0039] The moving component 13 includes a slide rail and a slider that is slidably disposed on the slide rail. A fixing component 11 is fixedly connected above the slider, thereby driving the fixing component 11 to move.

[0040] 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.

[0041] It should be noted that, in order to facilitate the connection between the movable component 13 and the fixed component 11, a support base plate is also provided, on which the fixed component 11 is fixed and connected to the slider of the movable component 13 through the support base plate.

[0042] It should also be noted that, since the fixing component 11 includes a first fixing seat 111 and a second fixing seat 112, the first fixing seat 111 and the second fixing seat 112 can be connected to two moving components 13 respectively (e.g., Figure 1 , Figure 4 As shown), however, the driving of the two moving components 13 should be synchronous, that is, the first fixed seat 111 and the second fixed seat 112 should be driven to move simultaneously, with the same direction of movement and the same distance traveled; of course, the first fixed seat 111 and the second fixed seat 112 can also be connected to a moving component 13 at the same time, and the driving can be achieved through a moving component 13. As mentioned above, a support base plate can also be set.

[0043] In use, the axial load loading mechanism 1 of the present invention mounts the pipe to be tested onto the axial loading structure 122, i.e., the end of the pipe is fixedly connected to the first swing arm 121. The axial loading structure 122 applies the axial load to the first swing arm 121. Because the axial loading structure 122 is rotatably connected to one end of the first swing arm 121, and the other end of the first swing arm 121 is fixedly connected to the first fixed seat 111, the axial load acting on the first swing arm 121 can be applied to the pipe. During the test, when a radial force is applied to the pipe, the pipe moves, causing the first swing arm 121 to rotate. The rotation of the first swing arm 121 drives the axial loading structure 122 to rotate, allowing the axial loading structure 122 to continuously apply the axial load to the pipe.

[0044] In some embodiments, the first swing arm 121 includes a vertically arranged first swing portion 1211 and a second swing portion 1212. One end of the first swing portion 1211 is rotatably connected to the first fixed base 111, and the other end is fixedly connected to one end of the second swing portion 1212. The other end of the second swing portion 1212 is rotatably connected to the axial loading structure 122. A connecting groove 1213 is provided at the corner where the first swing portion 1211 and the second swing portion 1212 connect. A connecting hole for connecting the pipe clamp 4 is provided in the connecting groove 1213. This structure of the first swing arm 121 can reduce rigid damage under stress, thereby improving the service life of the first swing arm 121.

[0045] For example, a pipe clamp 4 is installed in the connecting groove 1213, and one end of the pipe is connected through the pipe clamp 4. The end of the pipe abuts against the groove wall of the connecting groove 1213 near the second swing part 1212.

[0046] For example, one end of the first swing arm 121 is pivotally connected to the first fixed base 111 via a pin-type sensor, and the other end of the first swing arm 121 is pivotally connected to the axial loading structure 122 via a pin-type sensor. By setting the pin-type sensor, the bending force during pipe bending tests can be measured, and the obtained bending force has guiding significance for pipe manufacturing and use. For example, a displacement sensor is set at the bending point of the pipe, and the bending stroke at the bending point is obtained through this displacement sensor. The angle (i.e., pipe bending angle) between the bending stroke and the fixed point of the pipe (such as the fixed point of the axial load loading mechanism 1) can be obtained. When both the pipe bending angle and the bending force are obtained simultaneously, the relationship between the pipe bending angle and the bending force can be obtained.

[0047] In some embodiments, such as Figure 3 As shown, a first limiting boss 123 is provided in the connecting groove 1213, and the first limiting boss 123 is used to limit the rotation of the pipe clamp 4.

[0048] For example, such as Figure 4 As shown, the first limiting boss 123 is provided on the side near the first fixed seat 111 located in the connecting groove 1213. During the pipe bending test, the pipe clamp 4 will rotate around the connection position with the connecting hole. When the pipe clamp 4 rotates a certain angle, the first limiting boss 123 can block the pipe clamp 4 to prevent it from continuing to rotate, thus preventing the pipe clamp 4 from deflecting too much angle in the free state.

[0049] In the structure of this invention, the bottom of the first swing arm 121 can be suspended. However, in such a structure, the first swing arm 121 only has support at both ends, and both ends need to rotate. The first swing arm 121 being suspended makes it prone to damage and also hinders rotation. Therefore, in some embodiments, a caster wheel 3 is provided at the bottom of the first swing arm 121. This not only improves the service life of the first swing arm 121 but also avoids affecting its rotation, thus improving the accuracy of the experiment.

[0050] In some embodiments, such as Figures 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 connected to the connecting hole via pins. 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. This pipe clamp 4 facilitates pipe assembly. For example, the first mold base 41 is first fixed to the first swing arm 121, then the pipe is assembled onto the first mold base 41, and finally the second mold base 42 is connected to fix the pipe.

[0051] In some embodiments, such as Figure 8 As shown, it also includes a mold 5; half of the mold 5 is shown in the figure. The 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 molds 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.

[0052] In some embodiments, a fixed base plate 2 is also included, the lower end of the first swing arm 121 is disposed on the fixed base plate 2, and the fixed base plate 2 is used to fix it in the test area.

[0053] In some embodiments, the axial loading structure 122 includes a second support portion 1221 and an axial load loading portion 1222. The lower end of the second support portion 1221 is rotatably connected to the second fixed base 112, and the upper end is fixedly connected to one end of the axial load loading portion 1222. The other end of the axial load loading portion 1222 is rotatably connected to the first swing arm 121. For example, the axial load loading portion 1222 can be a hydraulic cylinder, which is more convenient for controlling the magnitude of the axial load.

[0054] In some embodiments, the second support portion 1221 is connected to the second fixed base 112 via a first slewing bearing.

[0055] This embodiment also provides a pipe bending test device, such as Figure 9 As shown, it includes the axial load loading mechanism 1 described above.

[0056] Two axial load loading mechanisms 1 can be symmetrically arranged. Both axial load loading mechanisms 1 can be driven by the moving component 13 to move along the axial direction of the pipeline, which further improves the range of pipeline lengths that the test device can test.

[0057] It should be noted that, Figure 9 In this device, only one axial load loading mechanism 1 can be driven by the moving component 13 to move along the axial direction of the pipe; the other axial loading mechanism does not have the moving component 13, and it includes the fixed component 11 and the moving component 12 described above, with the fixed component 11 fixed to the pipe bending test device.

[0058] Before the pipe bending test, such as Figure 9As shown, both ends of the pipe are connected to pipe clamps 4 of two axial load loading mechanisms 1, respectively. The axial loading structures 12 of both axial load loading mechanisms 1 apply axial loads to the pipe. After completion, a pipe bending test is conducted, applying a radial load to the pipe. During this process, the pipe deformation and / or movement causes the first swing arm 121 to rotate, and the rotation of the first swing arm 121 causes the axial loading structure 12 to rotate. The axial load loading mechanism 1 of this invention not only moves with the pipe during the pipe bending test, but also maintains a precise axial load on the pipe throughout the process, thereby improving the accuracy of the test.

[0059] During the experiment, measuring components will be set in the experimental device according to the parameters required. Those skilled in the art can set them according to actual needs, so they will not be described in detail here.

[0060] It should be noted that the test area should be understood as the area where the pipe bending test will be conducted, as shown in the example below. Figure 9 The pipe bending test apparatus shown is an integrated device that combines the axial load loading mechanism 1 and the radial load loading mechanism of the present invention into a single unit; alternatively, a test area can be a space, such as a dedicated test chamber, in which the axial load loading mechanism 1 is arranged.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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. An axial load loading mechanism for pipe bending tests, characterized in that, The device includes a fixing component (11), an actuating component (12), and a moving component (13). The fixing component (11) includes a first fixing seat (111) and a second fixing seat (112). The actuating component (12) includes a first swing arm (121) and an axial loading structure (122). The first fixing seat (111) is used to fix the device in the test area. One side of the first fixing seat (111) is rotatably connected to one end of the first swing arm (121). The other end of the first swing arm (121) is rotatably connected to the axial loading structure (122). The lower end of the axial loading structure (122) is rotatably connected to the second fixing seat (112). The second fixing seat (112) is used to fix the device in the test area. The first swing arm (121) has a connection position in the middle for rotating and connecting the pipe clamp (4); in the pipe bending test, the axial loading structure (122) can apply axial load to the pipe held by the pipe clamp (4); The moving component (13) is used to drive the fixed component (11) to move in the axial direction of the pipe.

2. The axial load loading mechanism for pipe bending tests according to claim 1, characterized in that, The first swing arm (121) includes a first swing part (1211) and a second swing part (1212) arranged vertically. One end of the first swing part (1211) is rotatably connected to the first fixed seat (111), and the other end is fixedly connected to one end of the second swing part (1212). The other end of the second swing part (1212) is rotatably connected to the axial loading structure. A connecting groove (1213) is provided at the corner where the first swing part (1211) and the second swing part (1212) are connected. A connecting hole for connecting the pipe clamp (4) is provided in the connecting groove (1213).

3. The axial load loading mechanism for pipe bending tests according to claim 2, characterized in that, The connecting groove (1213) is provided with a first limiting boss (123), which is used to limit the rotation of the pipe clamp (4).

4. The axial load loading mechanism for pipe bending tests according to claim 2, characterized in that, The bottom end of the first swing arm (121) is provided with a caster wheel (3).

5. The axial load loading mechanism for pipe bending tests according to claim 2, characterized in that, A pipe clamp (4) is rotatably connected inside the connecting groove (1213).

6. The axial load loading mechanism for pipe bending tests according to claim 5, 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 connected to the connecting hole by a pin. A first arc groove (411) is provided in the middle of the first mold base (41). A second arc 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 groove (411) and the second arc groove (421) are connected to clamp the pipe.

7. The axial load loading mechanism for pipe bending tests according to any one of claims 1-4, characterized in that, It also includes a fixed base plate (2), the lower end of the first swing arm (121) is disposed on the fixed base plate (2), and the fixed base plate (2) is used to fix it in the test area.

8. The axial load loading mechanism for pipe bending tests according to any one of claims 1-4, characterized in that, The axial loading structure (122) includes a second support part (1221) and an axial load loading part (1222). The lower end of the second support part (1221) is rotatably connected to the second fixed seat (112), and the upper end is fixedly connected to one end of the axial load loading part (1222). The other end of the axial load loading part (1222) is rotatably connected to the first swing arm (121).

9. The axial load loading mechanism for pipe bending tests according to claim 8, characterized in that, The second support (1221) is connected to the second fixed seat (112) via the first slewing bearing.

10. A pipe bending test apparatus, characterized in that, Includes the axial load loading mechanism as described in any one of claims 1-9.

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