A four-point bending test device for pipes

Abstract

The present application belongs to the field of pipeline bending test device, and particularly relates to a pipeline four-point bending test device, which comprises an axial load loading mechanism, a radial load loading mechanism and a feeding mechanism; two pipeline clamps connected with the axial load loading mechanism and two pipeline clamps connected with the radial load loading mechanism are coaxially arranged, the pipeline clamp comprises a first mold base and a second mold base, the side surface of the first mold base is provided with a first arc-shaped groove, and the side surface of the second mold base is provided with a second arc-shaped groove matched with the first arc-shaped groove to connect the pipeline; the first mold base is connected with the axial load loading mechanism and the radial load loading mechanism, and the second mold base is detachably connected with the first mold base; at least two feeding mechanisms are arranged, and the at least two feeding mechanisms are used for pushing the pipeline into the first arc-shaped groove. The present application can realize accurate and stable pipeline feeding through the cooperation of the pipeline clamp with the specific dismounting function and the feeding mechanism, and has the advantages of high efficiency, high accuracy and low cost.

Description

Technical Field

[0001] This invention belongs to the field of pipeline bending test devices, specifically relating to a pipeline four-point bending test device. 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] The four-point bending test for pipelines involves setting four contact points at both ends and the middle of the pipeline. The pipeline bends at four points under the action of these four contact points; that is, two points where axial load is applied and two points where radial load is applied. At the same time, the bending radius, strain and other relevant parameters of the pipeline are measured during the test to ensure that the pipeline meets the requirements for marine operations.

[0004] Before conducting a four-point bending test on a pipeline, the pipeline needs to be fixed to the testing device. Specifically, both ends of the pipeline need to be connected to the axial load loading mechanism, and the middle part needs to be connected to the radial load loading mechanism. Currently, most methods use lifting equipment, robotic arms, etc., to lift the pipeline and then connect it to the axial and radial load loading mechanisms. However, the above pipeline loading method has the following disadvantages:

[0005] (1) Lifting equipment and robotic arms occupy a large amount of space, are inconvenient to operate, and are expensive;

[0006] (2) Low efficiency of material feeding through pipelines.

[0007] In view of this, the present invention is hereby proposed. Summary of the Invention

[0008] To address the technical problems existing in the prior art, this invention provides a four-point bending test device for pipelines. This invention achieves precise and stable pipeline feeding through the cooperation of a pipeline clamp with specific disassembly functions and a feeding mechanism, and has the advantages of high efficiency, high precision and low cost.

[0009] This invention includes the following technical solutions:

[0010] This invention provides a pipe four-point bending test device, including an axial load loading mechanism, a radial load loading mechanism, and a feeding mechanism; the two pipe clamps connected to the axial load loading mechanism and the two pipe clamps connected to the radial load loading mechanism are coaxially arranged. Each pipe clamp includes a first mold base and a second mold base. The first mold base has a first arc-shaped groove on its side, and the second mold base has a second arc-shaped groove on its side that cooperates with the first arc-shaped groove to connect the pipe; the first mold base connects the axial load loading mechanism and the radial load loading mechanism, and the second mold base is detachably connected to the first mold base.

[0011] At least two feeding mechanisms are provided, and at least two feeding mechanisms are used to push the pipe into the first arc-shaped groove.

[0012] Furthermore, the feeding mechanism includes a horizontal displacement structure, a lifting structure, and a pipe support structure connected sequentially from bottom to top. The lifting end of the lifting structure is fixedly connected to the pipe support structure, and the end opposite to the lifting end is fixedly connected to the horizontal displacement structure. The horizontal displacement structure drives the lifting structure to move back and forth horizontally in a direction perpendicular to the axes of the four pipe clamps, and the lifting structure drives the pipe support structure to rise and fall.

[0013] Furthermore, the lifting structure includes a first hydraulic cylinder or a lifting rod.

[0014] Furthermore, the pipe support structure includes a support frame and a concave roller. The lower end of the support frame is connected to the lifting structure, and the upper end is connected to the concave roller. The concave surface of the concave roller is used to support the pipe.

[0015] Furthermore, the support frame is a U-shaped support frame with the open end facing upwards. The lower end of the U-shaped support frame is connected to the lifting structure, and the open end of the U-shaped support frame is connected to both axial ends of the concave roller.

[0016] Furthermore, the concave roller is rotatably connected to the U-shaped support frame.

[0017] Furthermore, the horizontal displacement structure includes a track and a slide. The track is set in a direction perpendicular to the axis of the four pipe clamps. The track is connected to the slide, which can slide horizontally on the track. The upper end of the slide is fixedly connected to the lifting structure.

[0018] Furthermore, at least two guide rods are fixedly connected to the upper end of the slide, and the upper ends of the at least two guide rods are movably connected to guide holes opened in the pipe support structure.

[0019] Furthermore, it also includes a drive mechanism for driving the slide table to slide on the slide rail.

[0020] Furthermore, the drive mechanism includes a turbine screw jack, the slider of which is fixedly connected to the slide table, and the turbine screw jack drives the slide table to slide on the slide rail; or the drive mechanism includes a second hydraulic cylinder, which drives the slide table to slide on the slide rail.

[0021] By adopting the above technical solution, the present invention has the following advantages:

[0022] 1. This invention achieves precise and stable pipe feeding through the cooperation of a pipe clamp with specific disassembly function and a feeding mechanism, which has the advantages of high efficiency, high precision and low cost.

[0023] 2. The guide rod provided in this invention improves the stability of the pipe support structure during the lifting process and prevents the pipe on the concave roller from tipping over.

[0024] 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

[0025] 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.

[0026] Figure 1 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. Figure 1 ;

[0027] Figure 2 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. Figure 2 ;

[0028] Figure 3 This is a schematic diagram of the pipe clamp structure in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the first mold base in an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the second mold base in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the mold structure in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the feeding mechanism in an embodiment of the present invention. Figure 1 ;

[0033] Figure 8 This is a schematic diagram of the feeding mechanism in an embodiment of the present invention. Figure 2 ;

[0034] Figure 9 This is a schematic diagram of the axial load loading mechanism in an embodiment of the present invention. Figure 1 ;

[0035] Figure 10 This is a schematic diagram of the axial load loading mechanism in an embodiment of the present invention. Figure 2 ;

[0036] In the figure, 1-axial load loading mechanism, 11-fixed component, 111-first fixed seat, 112-second fixed seat, 12-moving component, 121-first swing arm, 1211-first swing part, 1212-second swing part, 1213-connecting groove, 122-axial loading structure, 1221-second support part, 1222-axial load loading part, 4-pipe clamp, 41-first mold base, 411-first arc groove, 42-second mold base, 421-second arc groove 5-Mold, 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, 9-Feeding mechanism, 91-Horizontal displacement structure, 911-Railway, 912-Slide table, 92-Lifting structure, 93-Pipe support structure, 931-Support frame, 932-Concave roller, 94-Guide rod, 95-Gear motor, 10-Drive mechanism, 20-Pipe. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] This embodiment provides a pipe four-point bending test device, such as Figure 1 , Figure 2As shown, it includes an axial load loading mechanism 1, a radial load loading mechanism 6, and a feeding mechanism 9; the two pipe clamps 4 connected to the axial load loading mechanism 1 and the two pipe clamps 4 connected to the radial load loading mechanism 6 are coaxially arranged, that is, the four pipe clamps 4 are coaxially arranged; since the pipe clamps 4 are used to connect pipes 20, they should be provided with circular holes for connecting pipes 20, so the coaxial arrangement of the four pipe clamps 4 can be understood as the circular holes of the four pipe clamps 4 for connecting pipes 20 being coaxially arranged; as Figures 3-5 As shown, the pipe clamp 4 includes a first mold base 41 and a second mold base 42. The first mold base 41 has a first arc-shaped groove 411 on its side, and the second mold base 42 has a second arc-shaped groove 421 on its side that cooperates with the first arc-shaped groove 411 to connect the pipe 20. The first mold base 41 is connected to the axial load loading mechanism 1 and the radial load loading mechanism 6, and the second mold base 42 is detachably connected to the first mold base 41. The first arc-shaped groove 411 and the first arc-shaped groove 412, when connected, form the circular hole.

[0040] At least two feeding mechanisms 9 are provided, and at least two feeding mechanisms 9 are used to push the pipe 20 into the first arc-shaped groove 411.

[0041] Preferably, two feeding structures 9 are provided, ensuring the stability and accuracy of feeding through the pipe 20.

[0042] The working principle is as follows: First, the second mold base 42 must be in a disassembled state; then, the feeding mechanism 9 pushes the pipe 20 into the first arc-shaped groove 411 of the first mold base 41, and then the feeding mechanism 9 stops moving; finally, the second mold base 42 is connected to the first mold base 41, so that the pipe 20 is fixedly connected in the first arc-shaped groove 411 and the second arc-shaped groove 421; at this point, the feeding operation is completed. This invention improves the efficiency and accuracy of pipe 20 feeding by setting up such a pipe clamp 4 and feeding mechanism 9.

[0043] It should be noted that after the material is fed into the pipe 20, the feeding mechanism 9 should preferably move away from the pipe 20 to avoid affecting the bending test of the pipe 20.

[0044] In some embodiments, the feeding mechanism 9 includes a horizontal displacement mechanism and a pipe support structure 93 connected sequentially from bottom to top. The horizontal displacement structure 91 drives the lifting structure 92 to move back and forth horizontally in a direction perpendicular to the axes of the four pipe clamps 4. The horizontal displacement mechanism drives the pipe support structure 93 to move, so that the pipe 20 placed on the pipe support structure 93 enters the first arc groove 411 of the first mold base 41.

[0045] In some embodiments, such as Figures 7-8As shown, the feeding mechanism 9 includes a horizontal displacement structure 91, a lifting structure 92, and a pipe support structure 93 connected sequentially from bottom to top. The lifting end of the lifting structure 92 is fixedly connected to the pipe support structure 93, and the end opposite to the lifting end is fixedly connected to the horizontal displacement structure 91. The horizontal displacement structure 91 drives the lifting structure 92 to move back and forth horizontally in a direction perpendicular to the axis of the four pipe clamps 4 (since the four pipe clamps 4 are coaxially arranged, the axis is the coaxial axis). The lifting structure 92 drives the pipe support structure 93 to rise and fall.

[0046] Since the feeding mechanism 9 needs to push the pipe 20 into the first arc groove 411, this embodiment uses a horizontal displacement mechanism. Therefore, the feeding mechanism 9 may not have a lifting structure 92. This way, it is only necessary to ensure that the height of the pipe support structure 93 is sufficient to push the pipe 20 into the first arc groove 411. However, when testing pipes 20 of different diameters, pipe clamps 4 with different sizes of arc grooves (first arc groove 411 and second arc groove 421) can be used. In this case, the fixed-height pipe support structure 93 cannot meet the feeding requirements of pipes 20 when changing to pipes 20 of different diameters, which has the disadvantage of limited applicability. Therefore, the feeding mechanism 9 can also be equipped with a lifting structure 92, which can meet the feeding requirements of pipes 20 of different diameters.

[0047] It should be noted that when testing pipes 20 of different diameters, in addition to replacing the pipe clamp 4, a mold 5 can also be used. This eliminates the need to replace the pipe clamp 4; only the mold 5 of different sizes needs to be replaced. Figure 6 The diagram shows the structure of mold 5, which is used to connect within the first arc-shaped groove 411 and the second arc-shaped groove 421.

[0048] In some embodiments, the lifting structure 92 includes a first hydraulic cylinder or a lifting rod.

[0049] In some embodiments, such as Figures 7-8 As shown, the pipe support structure 93 includes a support frame 931 and a concave roller 932. The lower end of the support frame 931 is connected to the lifting structure 92, and the upper end is connected to the concave roller 932. The concave surface of the concave roller 932 is used to support the pipe 20.

[0050] In some embodiments, such as Figures 7-8 As shown, the support frame 931 is a U-shaped support frame 931 with the open end of the U-shaped support frame 931 facing upward. The lower end of the U-shaped support frame 931 is connected to the lifting structure 92, and the open end of the U-shaped support frame 931 is connected to both axial ends of the concave roller 932.

[0051] In some embodiments, the concave roller 932 is rotatably connected to the U-shaped support frame 931. This allows the concave roller 932 to rotate, enabling adjustment of the position of the pipe 20 placed on it. Figures 7-8 As shown, the concave roller 932 is rotatably connected to the U-shaped bracket via a rotating shaft. One of the rotating shafts passes through the U-shaped bracket and is connected to a reduction motor 95. The reduction motor 95 drives the concave roller 932 to rotate, which can more accurately control the rotation of the concave roller 932 and also avoid the mis-rotation of the concave roller 932.

[0052] In some embodiments, such as Figures 7-8 As shown, the horizontal displacement structure 91 includes a track 911 and a slide 912. The track 911 is oriented perpendicularly to the axes of the four pipe clamps 4 (this should be understood as the direction in which the slide 912 slides). The track 911 connects to the slide 912, which can slide horizontally on the track 911. The upper end of the slide 912 is fixedly connected to the lifting structure 92. This horizontal displacement structure 91 facilitates precise position control and provides higher control accuracy.

[0053] In some embodiments, such as Figures 7-8 As shown, at least two guide rods 94 are fixedly connected to the upper end of the slide table 912, and the upper ends of the at least two guide rods 94 are movably connected to the guide holes opened on the pipe support structure 93.

[0054] In some embodiments, such as Figures 7-8 As shown, the transverse cross-section of the slide table 912 is U-shaped. It can be either a "-" or "Ω" shape. This structural design allows for more space to be allocated for the position adjustment mechanism, resulting in a more rational component layout.

[0055] In some embodiments, such as Figures 7-8 As shown, it also includes a drive mechanism 10, which is used to drive the slide table 912 to slide on the slide rail.

[0056] In some embodiments, the drive mechanism 10 includes a worm gear lifter, the slider of which is fixedly connected to the slide table 912, and the worm gear lifter drives the slide table 912 to slide on a slide rail; or the drive mechanism 10 includes a second hydraulic cylinder, which drives the slide table 912 to slide on a slide rail. The sliding of the slide table 912 is achieved through the drive mechanism 10, which not only improves the automation level of the device but also further improves the accuracy of driving the slide table 912 to slide.

[0057] In this embodiment, the first and second hydraulic cylinders can be driven by a compressor, and the lifting rod can be driven by a motor; preferably, a geared motor.

[0058] Axial load loading mechanism 1, such as Figure 9 As shown, the device includes a fixing component 11 and an actuating component 12. 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, 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 used to fix the device in the test area. The middle part 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.

[0059] In some embodiments, such as Figure 9 As shown, 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.

[0060] In some embodiments, such as Figure 9 As shown, 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.

[0061] Radial load loading mechanism 6, such as Figure 10As 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, with one end of the radial load loading structure 61 fixedly connected to its upper end. The other end of the radial load loading structure 61 is fixedly connected to the pipe installation structure 63, which is used to securely connect pipes. The radial load loading structure 61 is horizontally positioned, allowing it to move back and forth horizontally to apply radial loads to the pipes. The support structure 62 includes a support frame 621 and a base plate 622. The lower end of the base plate 622 is installed in the test area, and its 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. 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 has a first connecting groove. The pipe clamp 4 is rotatably connected within the first connecting groove and is used to connect pipes.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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 pipe four-point bending test device, characterized in that, It includes an axial load loading mechanism (1), a radial load loading mechanism (6), and a feeding mechanism (9); the two pipe clamps (4) connected to the axial load loading mechanism (1) and the two pipe clamps (4) connected to the radial load loading mechanism (6) are coaxially arranged. The pipe clamps (4) include a first mold base (41) and a second mold base (42). The first mold base (41) has a first arc groove (411) on its side, and the second mold base (42) has a second arc groove (421) on its side that cooperates with the first arc groove (411) to connect the pipe (20). The first mold base (41) connects the axial load loading mechanism (1) and the radial load loading mechanism (6), and the second mold base (42) is detachably connected to the first mold base (41). At least two feeding mechanisms (9) are provided, and at least two feeding mechanisms (9) are used to push the pipe (20) into the first arc-shaped groove (411).

2. The pipe four-point bending test device according to claim 1, characterized in that, The feeding mechanism (9) includes a horizontal displacement structure (91), a lifting structure (92) and a pipe support structure (93) connected sequentially from bottom to top. The lifting end of the lifting structure (92) is fixedly connected to the pipe support structure (93), and the end opposite to the lifting end is fixedly connected to the horizontal displacement structure (91). The horizontal displacement structure (91) drives the lifting structure (92) to move back and forth horizontally in a direction perpendicular to the axis of the four pipe clamps (4). The lifting structure (92) drives the pipe support structure (93) to rise and fall.

3. The pipe four-point bending test device according to claim 2, characterized in that, The lifting structure (92) includes a first hydraulic cylinder or a lifting rod.

4. A pipe four-point bending test device according to any one of claims 2-3, characterized in that, The pipe support structure (93) includes a support frame (931) and a concave roller (932). The lower end of the support frame (931) is connected to the lifting structure (92), and the upper end is connected to the concave roller (932). The concave surface of the concave roller (932) is used to support the pipe (20).

5. The pipe four-point bending test device according to claim 4, characterized in that, The support frame (931) is a U-shaped support frame (931), with the open end of the U-shaped support frame (931) facing upward. The lower end of the U-shaped support frame (931) is connected to the lifting structure (92), and the open end of the U-shaped support frame (931) is connected to the two axial ends of the concave roller (932).

6. The pipe four-point bending test device according to claim 5, characterized in that, The concave roller (932) is rotatably connected to the U-shaped support frame (931).

7. A pipe four-point bending test device according to claim 2, characterized in that, The horizontal displacement structure (91) includes a track (911) and a slide (912). The track (911) is set in a direction perpendicular to the axis of the four pipe clamps (4). The track (911) is connected to the slide (912). The slide (912) can slide horizontally on the track (911). The upper end of the slide (912) is fixedly connected to the lifting structure (92).

8. A pipe four-point bending test device according to claim 7, characterized in that, At least two guide rods (94) are fixedly connected to the upper end of the slide (912), and the upper ends of the at least two guide rods (94) are movably connected to the guide holes opened on the pipe support structure (93).

9. A pipe four-point bending test apparatus according to any one of claims 7-8, characterized in that, It also includes a drive mechanism (10) for driving the slide table (912) to slide on the slide rail.

10. A pipe four-point bending test device according to claim 9, characterized in that, The drive mechanism (10) includes a turbine screw jack, the slider of which is fixedly connected to the slide table (912), and the turbine screw jack drives the slide table (912) to slide on the slide rail; or the drive mechanism (10) includes a second hydraulic cylinder, which drives the slide table (912) to slide on the slide rail.

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