A flexible pipe fatigue test apparatus

Abstract

The utility model provides a kind of flexible pipe fatigue test device, comprising: base, the upper end of the base is provided with test mechanism, the clamping mechanism for fixed flexible pipe is provided on the test mechanism, the test mechanism includes two uprights, two the upper left and right ends of the upside of base are fixedly connected, the upper end of the upright is fixedly connected with mounting plate, sliding assembly is provided on the mounting plate, compared with prior art, the utility model has the beneficial effects as follows: by setting test mechanism, repeatedly stretching fatigue test is carried out to flexible pipe, the dynamic load frequently received in actual use can be simulated, the durability and fatigue resistance under repeated stress are effectively evaluated, and by setting clamping mechanism, the clamping design of support from inside to outside can evenly disperse clamping force, avoid the pipe wall deformation or local stress concentration caused by traditional outer clamping, to more truly simulate actual working condition.

Description

Technical Field

[0001] This utility model belongs to the field of flexible tube testing, and specifically relates to a flexible tube fatigue testing device. Background Technology

[0002] Flexible pipes are pipelines capable of withstanding complex loads such as bending, torsion, and tension. Their core feature is their multi-layered structural design, typically including an inner lining, a reinforcing layer, and an outer protective layer. The materials used are mostly high-molecular polymers, metal braided layers, or composite materials to achieve a balance between flexibility and strength. The advantage of flexible pipes lies in their adaptability to complex environments, such as subsea laying or dynamic load applications. However, their performance is highly dependent on design and manufacturing processes, especially the assessment of fatigue life. Without fatigue testing, flexible pipes are prone to early failure in actual use. Because flexible pipes undergo repeated bending and stretching under dynamic loads, microscopic damage gradually accumulates inside the material, eventually leading to crack propagation or interlayer delamination. Furthermore, stress concentration points or material defects in the design cannot be detected in time, causing the pipeline to rupture or leak far below its expected lifespan, especially in high-pressure or corrosive environments where the risk is even higher. Therefore, we aim to design a fatigue testing device for flexible pipes to address this problem. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a flexible tube fatigue testing device to solve the problems mentioned in the background technology.

[0004] This utility model is achieved through the following technical solution: a flexible tube fatigue testing device, comprising: a base, a testing mechanism provided at the upper end of the base, and a clamping mechanism for fixing the flexible tube provided on the testing mechanism;

[0005] The test mechanism includes two columns, which are fixedly connected to the upper left and right ends of the base. The upper end of each column is fixedly connected to a mounting plate, and a sliding component is provided on the mounting plate.

[0006] The test mechanism also includes a drive assembly, which is disposed on the upper surface of the base. A support block is disposed on the drive assembly, and an installation cylinder is fixedly connected to the support block. By setting up the test mechanism, repeated tensile fatigue tests are performed on the flexible tube, which can simulate the dynamic loads frequently experienced in actual use and effectively evaluate its durability and fatigue resistance under repeated stress.

[0007] In a preferred embodiment, the sliding assembly includes a slide rail, the upper and lower ends of which are respectively sleeved on the inside of the base and the mounting plate via bearings, and a slider is slidably sleeved on the outside of the slide rail, the slider being fixedly connected to the inside of the support block by screws.

[0008] In a preferred embodiment, the drive assembly includes a drive motor, which is fixedly mounted on the upper surface of the base. A flywheel is fixedly connected to the output shaft of the drive motor, and a transmission rod is hinged to the flywheel. The other end of the transmission rod is hinged to a support block.

[0009] In a preferred embodiment, the clamping mechanism includes a support rod, with connecting sleeves sleeved at both ends of the support rod via bearings. A clamping plate is hinged to the outside of the connecting sleeve via a connecting rod. By setting up the clamping mechanism, the clamping force can be evenly distributed by the clamping design that supports from the inside out, avoiding pipe wall deformation or local stress concentration caused by traditional external clamping, thereby more realistically simulating actual working conditions.

[0010] In a preferred embodiment, a mounting block is sleeved on the lower outer side of the support rod via a bearing, and the mounting block is fixedly connected to the mounting cylinder.

[0011] In a preferred embodiment, a mounting block is sleeved on the lower outer side of the support rod via a bearing, and the mounting block is fixedly connected to the mounting cylinder.

[0012] In a preferred embodiment, a clamping motor is fixedly installed on the lower side of the support block, and the output shaft of the clamping motor is fixedly connected to the support rod through a coupling.

[0013] In a preferred embodiment, the outer surface of the clamp is provided with a rubber pad for increasing friction.

[0014] After adopting the above technical solution, the beneficial effects of this utility model are:

[0015] By setting up a testing mechanism to conduct repeated tensile fatigue tests on flexible tubes, it is possible to simulate the dynamic loads frequently experienced in actual use and effectively evaluate their durability and fatigue resistance under repeated stress.

[0016] By setting up a clamping mechanism, the clamping force can be evenly distributed by the clamping design that supports from the inside out, avoiding pipe wall deformation or local stress concentration caused by traditional external clamping, thus more realistically simulating actual working conditions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a three-dimensional view of the overall structure of a flexible tube fatigue testing device according to this utility model.

[0019] Figure 2 This is a partial three-dimensional view of a flexible tube fatigue testing device according to the present invention.

[0020] Figure 3 This is a partial exploded view of the fatigue testing device for flexible tubes according to this utility model.

[0021] Figure 4 This is a perspective view of the clamping mechanism of a flexible tube fatigue testing device according to the present invention.

[0022] In the diagram, 1-base, 2-test mechanism, 3-clamping mechanism;

[0023] 21-Column, 22-Mounting plate, 23-Sliding assembly, 231-Slide rail, 232-Slider, 24-Drive assembly, 241-Drive motor, 242-Flywheel, 243-Transmission rod, 25-Support block, 26-Mounting cylinder;

[0024] 31-Support rod, 32-Connecting sleeve, 33-Clamping plate, 34-Slide cylinder, 35-Mounting block, 36-Clamping motor. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1-3 As the first embodiment of this utility model:

[0027] A fatigue testing device for flexible tubes includes: a base 1, a testing mechanism 2 provided at the upper end of the base 1, and a clamping mechanism 3 for fixing the flexible tube provided on the testing mechanism 2.

[0028] The test mechanism 2 includes two columns 21, which are fixedly connected to the upper left and right ends of the base 1. The upper end of the column 21 is fixedly connected to the mounting plate 22, and the mounting plate 22 is provided with a sliding component 23.

[0029] The test mechanism 2 also includes a drive assembly 24, which is disposed on the upper surface of the base 1. A support block 25 is disposed on the drive assembly 24, and an installation cylinder 26 is fixedly connected to the support block 25. By setting up the test mechanism 2, repeated tensile fatigue tests are performed on the flexible tube, which can simulate the dynamic loads frequently experienced in actual use and effectively evaluate its durability and fatigue resistance under repeated stress.

[0030] The sliding assembly 23 includes a slide rail 231. The upper and lower ends of the slide rail 231 are respectively connected to the interior of the base 1 and the mounting plate 22 through bearings. A slider 232 is slidably sleeved on the outside of the slide rail 231. The slider 232 is fixedly connected to the interior of the support block 25 by screws.

[0031] The drive assembly 24 includes a drive motor 241, which is fixedly mounted on the upper surface of the base 1. A flywheel 242 is fixedly connected to the output shaft of the drive motor 241, and a transmission rod 243 is hinged to the flywheel 242. The other end of the transmission rod 243 is hinged to the support block 25.

[0032] Specifically, when fatigue testing of the flexible tube is required, the two ends of the flexible tube are first fixed to the inside of the column 21 by the clamping mechanism 3. Then, the drive motor 241 is started. The output shaft of the drive motor 241 drives the flywheel 242 to rotate. During the rotation of the flywheel 242, one end of the transmission rod 243 is driven to make a circular motion. At the same time, the other end of the transmission rod 243 drives the support block 25 and the slider 232 to make a linear motion on the slide rail 231. Finally, the clamping mechanism 3 and one end of the flexible tube are driven to repeatedly stretch and contract to evaluate its durability and fatigue resistance under repeated stress.

[0033] Please see Figures 1-2 as well as Figure 4 As a second embodiment of this utility model:

[0034] The clamping mechanism 3 includes a support rod 31. Both ends of the support rod 31 are connected to a connecting sleeve 32 through bearings. The outer side of the connecting sleeve 32 is hinged to a clamping plate 33 through a connecting rod. By setting the clamping mechanism 3, the clamping force can be evenly distributed by the clamping design that supports from the inside out, avoiding the pipe wall deformation or local stress concentration caused by traditional external clamping, thus simulating the actual working conditions more realistically.

[0035] The lower end of the support rod 31 is threaded and a slide cylinder 34 is screwed onto it. The outer side of the slide cylinder 34 is hinged to the clamping plate 33 via a connecting rod.

[0036] The lower outer side of the support rod 31 is fitted with a mounting block 35 via a bearing sleeve, and the mounting block 35 is fixedly connected to the mounting cylinder 26.

[0037] A clamping motor 36 is fixedly installed on the lower side of the support block 25, and the output shaft of the clamping motor 36 is fixedly connected to the support rod 31 through a coupling.

[0038] The outer surface of the clamp 33 is provided with a rubber pad to increase friction.

[0039] Based on the above embodiments, further, before the fatigue test of the flexible tube is required, the two ends of the flexible tube are fixed by the upper and lower clamping mechanisms 3. First, the flexible tube is sleeved and clamped on the outside. Then, the support rod 31 is activated. The lower end of the support rod 31 and the slide cylinder 34 generate threaded movement, so that the slide cylinder 34 generates linear displacement. Then, the slide cylinder 34 pushes one end of the connecting rod to rotate to change the angle of the connecting rod, so that the other end of the connecting rod pushes the clamp to the outside to tighten, thereby tightening and clamping the flexible tube.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flexible pipe fatigue test apparatus comprising: The base (1) is characterized in that a test mechanism (2) is provided at the upper end of the base (1), and a clamping mechanism (3) for fixing the flexible tube is provided on the test mechanism (2). The test mechanism (2) includes two columns (21), which are fixedly connected to the upper left and right ends of the base (1). The upper end of the column (21) is fixedly connected to the mounting plate (22), and the mounting plate (22) is provided with a sliding component (23). The test mechanism (2) also includes a drive assembly (24), which is disposed on the upper surface of the base (1). A support block (25) is disposed on the drive assembly (24), and an installation cylinder (26) is fixedly connected to the support block (25).

2. The flexible tube fatigue testing device as described in claim 1, characterized in that: The sliding assembly (23) includes a slide rail (231), the upper and lower ends of which are respectively connected to the interior of the base (1) and the mounting plate (22) by bearings. A slider (232) is slidably connected to the outside of the slide rail (231), and the slider (232) is fixedly connected to the interior of the support block (25) by screws.

3. The flexible tube fatigue testing device as described in claim 1, characterized in that: The drive assembly (24) includes a drive motor (241), which is fixedly mounted on the upper surface of the base (1). A flywheel (242) is fixedly connected to the output shaft of the drive motor (241), and a transmission rod (243) is hinged to the flywheel (242). The other end of the transmission rod (243) is hinged to the support block (25).

4. The flexible tube fatigue testing device as described in claim 1, characterized in that: The clamping mechanism (3) includes a support rod (31), and both ends of the support rod (31) are connected to a connecting sleeve (32) through bearings. The outer side of the connecting sleeve (32) is hinged to a clamping plate (33) through a connecting rod.

5. The flexible tube fatigue testing device as described in claim 4, characterized in that: The lower end of the support rod (31) is threaded and a slide cylinder (34) is screwed onto it. The outer side of the slide cylinder (34) is hinged to the clamping plate (33) via a connecting rod.

6. The flexible tube fatigue testing device as described in claim 4, characterized in that: The lower outer side of the support rod (31) is fitted with a mounting block via a bearing, and the mounting block (35) is fixedly connected to the mounting cylinder (26).

7. The flexible tube fatigue testing device as described in claim 1, characterized in that: A clamping motor (36) is fixedly installed on the lower side of the support block (25), and the output shaft of the clamping motor (36) is fixedly connected to the support rod (31) through a coupling.

8. The flexible tube fatigue testing device as described in claim 5, characterized in that: The outer surface of the clamp (33) is provided with a rubber pad for increasing friction.

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