Device and method for testing change of outer diameter of umbilical cable under high water pressure

Abstract

The invention relates to the technical field of ocean engineering, in particular to an umbilical cable outer diameter change testing device and method under high water pressure, the testing device comprises a water pressure tank, a pressure gauge, a supporting seat and an abutting assembly, the abutting assembly comprises an arc-shaped clamping ring and an elastic tensioning piece, and the diameter of the arc-shaped clamping ring is smaller than the initial outer diameter of an umbilical cable sample; the arc-shaped clamping ring is installed above the umbilical cable sample, one end of the elastic tensioning piece is connected with the arc-shaped clamping ring, and the other end of the elastic tensioning piece is connected with the supporting base so that the umbilical cable sample can be limited between the supporting base and the arc-shaped clamping ring. The diameter of the arc-shaped snap ring can be selected before the test, and the snap ring with the proper diameter is selected according to the preset quantity of the test. In the testing process, water is injected into the water pressure tank through the water pressure pump for pressurization, the arc-shaped clamping ring is observed until the umbilical cable sample is sleeved with the arc-shaped clamping ring, pressurization is stopped, and at the moment, the pressure value of the pressure gauge is read and recorded. In the testing process of the testing device, the whole process is carried out in the water pressure tank, interference of other factors is avoided, and measured data are more real and accurate.

Description

Technical Field

[0001] The invention relates to the technical field of marine engineering, and in particular to a device and method for testing the outer diameter change of an umbilical cable under high water pressure. Background Art

[0002] Umbilical cables are essential engineering equipment in marine engineering, scientific research, exploration and other marine technology fields. They are mainly used to connect surface ships and underwater systems, and provide power transmission, data signal transmission, chemical agent and hydraulic fluid delivery for underwater system equipment. With the continuous exploration and development of deep-sea resources, higher requirements are placed on the application depth of umbilical cables. In order to ensure that the umbilical cable can work normally at a depth of more than 3,000 meters or even 10,000 meters, it is required to have good resistance to high water pressure. The change in the outer diameter of the umbilical cable is one of the important indicators for evaluating the resistance of the umbilical cable to high water pressure. Under ultra-deep water, the outer diameter of the umbilical cable will be compressed, affecting the adaptability and sealing of the entire cable and the connector, and then affecting the operation of the entire deep-sea operation system, and even causing water leakage. Therefore, it is particularly important to test the change in the outer diameter of the umbilical cable under different high water pressures, but there is currently no relevant test method in China to test the change in the outer diameter of the umbilical cable under different high water pressures.

[0003] At present, the commonly used test method for the outer diameter change of umbilical cables under ultra-high water pressure abroad is to put the umbilical cable into a water pressure tank, apply a certain water pressure and maintain it for a certain period of time, then take out the umbilical cable and measure its outer diameter data, and compare it with the outer diameter data of the umbilical cable before being put into the water pressure tank to obtain the outer diameter change of the umbilical cable under a certain water pressure. This test method is to take the umbilical cable out of the water pressure tank and measure the outer diameter change after it is subjected to a certain water pressure. When measuring the outer diameter, the umbilical cable is not subjected to water pressure, and its outer diameter has a certain rebound, which will lead to inaccurate measured change values ​​and cannot provide scientific and effective reference values ​​for actual use. Summary of the invention

[0004] The object of the present invention is to provide a device for testing the change in outer diameter of an umbilical cord under high water pressure to solve the problems in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a test device for the change of umbilical cord outer diameter under high water pressure, comprising a water pressure tank, a pressure gauge, a support seat and an abutment assembly, the interior of the water pressure tank is pressurized by water injection through a water pressure pump to simulate different water pressure environments; the pressure gauge is installed on the outside of the water pressure tank to monitor the internal pressure of the water pressure tank; the support seat is fixed inside the water pressure tank for placing the umbilical cable sample; the abutment assembly comprises an arc-shaped clamp and an elastic tensioning member, the diameter of the arc-shaped clamp is smaller than the initial outer diameter of the umbilical cable sample, the arc-shaped clamp is installed above the umbilical cable sample, one end of the elastic tensioning member is connected to the arc-shaped clamp, and the other end is connected to the support seat to confine the umbilical cable sample between the support seat and the arc-shaped clamp.

[0006] Furthermore, the arc-shaped clamp is arranged in a U-shape, the groove of the arc-shaped clamp is buckled on the top of the umbilical cable sample, the edge of the arc-shaped clamp is provided with a connecting edge, and the elastic tensioning member is connected to the connecting edge.

[0007] Furthermore, elastic tensioning members are provided on both sides of the arc-shaped clamping ring, and the umbilical cable sample is located between the two elastic tensioning members.

[0008] Furthermore, the support seat includes a fixed base and a support beam, the support beam is fixed on the fixed base, the umbilical cable sample is placed on the support beam, one end of the elastic tensioner is connected to the arc-shaped clamping ring, and the other end is connected to the fixed base.

[0009] Furthermore, the support beam is arranged in a Y shape to form a limiting groove, and the umbilical cable sample is confined in the limiting groove.

[0010] Furthermore, the device for testing the change in outer diameter of the umbilical cord under high water pressure also includes a camera, which is installed inside the water pressure tank.

[0011] Furthermore, the abutment components are multiple groups, each group of the abutment components includes an arc-shaped clamping ring and an elastic tensioning member, the diameter of each group of arc-shaped clamping rings is smaller than the initial outer diameter of the umbilical cable sample, and each group of arc-shaped clamping rings is installed above the umbilical cable sample through a corresponding elastic tensioning member, and the diameter of each group of arc-shaped clamping rings is set to decrease in sequence.

[0012] Furthermore, the present application also provides a method for testing the change in outer diameter of an umbilical cord under high water pressure, using the above-mentioned testing device for testing, and the testing method is as follows: Select the umbilical cable sample to be tested, seal both ends of it, and then fix it on the support seat; Install the abutment assembly, first snap the groove part of the arc-shaped clamp ring onto the top of the umbilical cable sample, then install elastic tensioning pieces on both sides of the arc-shaped clamp ring, one end of the elastic tensioning piece is connected to the arc-shaped clamp ring, and the other end is connected to the support seat; Use a hydraulic pump to fill the hydraulic tank with water and gradually increase the water pressure until the arc-shaped clamp ring is sleeved on the umbilical cable sample and the pressurization stops. At this time, read and record the pressure value on the pressure gauge.

[0013] Furthermore, the arc-shaped clamping ring is arranged in a U-shape, and the arc-shaped clamping ring is made of an alloy material with a high elastic modulus and is not easily deformed. A connecting edge is provided on the edge of the arc-shaped clamping ring, and the elastic tensioning member is connected to the connecting edge.

[0014] Furthermore, there are multiple groups of abutment assemblies, each group of abutment assemblies includes an arc-shaped clamp and an elastic tensioning piece, the diameter of each group of arc-shaped clamps is smaller than the initial outer diameter of the umbilical cable sample, and each group of arc-shaped clamps is installed on the top of the umbilical cable sample through the corresponding elastic tensioning piece, and the diameter of each group of arc-shaped clamps is set in descending order; water is injected into the water pressure tank through a water pressure pump and the water pressure is gradually increased, and whenever an arc-shaped clamp is first sleeved on the umbilical cable sample, the pressure value of the pressure gauge at this time is read and recorded.

[0015] The beneficial effects of the present invention are: The diameter of the arc-shaped clamp ring can be selected before the test, and the clamp ring of the appropriate diameter can be selected according to the preset test quantity. During the test, the water pressure tank is filled with water through a hydraulic pump to pressurize the arc-shaped clamp ring, and the arc-shaped clamp ring is observed until the arc-shaped clamp ring is sleeved on the umbilical cable sample and the pressurization is stopped. At this time, the pressure value of the pressure gauge is read and recorded. During the test of this test device, the whole process is carried out in the water pressure tank without interference from other factors, and the measurement data is more real and accurate.

[0016] The device for testing the change in outer diameter of the umbilical cord under high water pressure also includes a camera, which is installed inside the water pressure tank. The camera can be used to observe the deformation state of the arc-shaped clamping ring, which provides a better observation effect.

[0017] Each set of abutment components includes an arc-shaped clamp and an elastic tensioning member. The diameter of each set of arc-shaped clamp is smaller than the initial outer diameter of the umbilical cable sample, and each set of arc-shaped clamp is installed on the top of the umbilical cable sample through the corresponding elastic tensioning member. The diameter of each set of arc-shaped clamp is set in descending order. By designing arc-shaped clamps of different sizes, water is injected into the hydraulic tank through a hydraulic pump and the water pressure is gradually increased. Whenever an arc-shaped clamp is first sleeved on the umbilical cable sample, the pressure value of the pressure gauge is read and recorded at this time. Multiple sets of data can be tested and recorded for efficient testing. Alternatively, when the number of arc-shaped clamps is large enough, the pressure of the hydraulic pump can be controlled. When the pressure reaches the preset value, it is observed and recorded which arc-shaped clamp is just clamped, so that the outer diameter change of umbilical cables of different sizes and different working water depths under different water pressures can be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the overall structure of a device for testing the change in outer diameter of an umbilical cord under high water pressure provided by an embodiment of the present invention; Figure 2 A side view of a device for testing the change in outer diameter of an umbilical cord under high water pressure provided by an embodiment of the present invention.

[0020] Description of reference numerals: 1. Hydraulic tank; 2. Hydraulic pump; 3. Pressure gauge; 4. Support seat; 41. Fixed base; 42. Support beam; 421. Limiting groove; 5. Umbilical cable sample; 6. Abutment assembly; 61. Arc clamp; 611. Groove; 612. Connecting edge; 62. Elastic tensioner; 7. Camera. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] Example 1

[0026] A device for testing the change of umbilical outer diameter under high water pressure is provided as an embodiment of the present invention, comprising a water pressure tank 1, a pressure gauge 3, a support seat 4 and an abutment assembly 6. The interior of the water pressure tank 1 is pressurized by water injection through a water pressure pump 2 to simulate different water pressure environments; the pressure gauge 3 is installed on the outside of the water pressure tank 1 to monitor the internal pressure of the water pressure tank 1; the support seat 4 is fixed inside the water pressure tank 1 for placing an umbilical cable sample 5; the abutment assembly 6 comprises an arc-shaped clamping ring 61 and an elastic tensioning member 62. The diameter of the arc-shaped clamping ring 61 is smaller than the initial outer diameter of the umbilical cable sample 5. The arc-shaped clamping ring 61 is installed above the umbilical cable sample 5. One end of the elastic tensioning member 62 is connected to the arc-shaped clamping ring 61, and the other end is connected to the support seat 4 to confine the umbilical cable sample 5 between the support seat 4 and the arc-shaped clamping ring 61.

[0027] The diameter of the arc-shaped snap ring 61 can be selected before the test, and a snap ring of appropriate diameter is selected according to the preset test amount. During the test, water is injected into the hydraulic tank 1 through the hydraulic pump 2 to pressurize the arc-shaped snap ring 61, and the arc-shaped snap ring 61 is observed until the arc-shaped snap ring 61 is sleeved on the umbilical cable sample 5 and the pressurization is stopped. At this time, the pressure value of the pressure gauge 3 is read and recorded. During the test of this test device, the whole process is carried out in the hydraulic tank 1, without interference from other factors, and the measured data is more real and accurate.

[0028] Specifically, the arc-shaped snap ring 61 is set in a U-shape, and the groove 611 of the arc-shaped snap ring 61 is buckled on the top of the umbilical cable sample 5. The edge of the arc-shaped snap ring 61 is provided with a connecting edge 612, and the elastic tensioning member 62 is connected to the connecting edge 612. Elastic tensioning members 62 are provided on both sides of the arc-shaped snap ring 61, and the umbilical cable sample 5 is located between the two elastic tensioning members 62. Connecting edges 612 are provided on both sides of the arc-shaped snap ring 61, and the two elastic tensioning members 62 are connected to their respective corresponding connecting edges 612. The elastic tensioning member 62 adopts a tension spring, which always exerts a pulling force on the arc-shaped snap ring 61. When the outer diameter of the umbilical cable sample 5 is reduced under the action of water pressure, the arc-shaped snap ring 61 can be pulled downward under the tension of the elastic tensioning member 62, so that the umbilical cable sample 5 is clamped into the groove 611 of the arc-shaped snap ring 61.

[0029] Furthermore, the support seat 4 includes a fixed base 41 and a support beam 42 , the support beam 42 is fixed on the fixed base 41 , the umbilical cable sample 5 is placed on the support beam 42 , one end of the elastic tensioning member 62 is connected to the arc-shaped clamping ring 61 , and the other end is connected to the fixed base 41 .

[0030] Specifically, a fixed base 41 is fixed at the bottom of the hydraulic tank 1, and a support beam 42 is provided at the top of the fixed base 41 near both ends. The support beam 42 is arranged in a Y shape to form a limiting groove 421, and the umbilical cable sample 5 is placed on the two support beams 42 and is limited in the limiting groove 421. The support beam 42 can play a supporting and fixing role for the umbilical cable sample 5. After the umbilical cable sample 5 is placed on the support beam 42, the abutment assembly 6 is installed. During installation, the arc-shaped clamping ring 61 is placed above the umbilical cable sample 5 and the groove 611 of the arc-shaped clamping ring 61 faces the umbilical cable sample 5. Then, the elastic tensioning member 62 is installed, and one end of the elastic tensioning member 62 is fixed on the connecting edge 612 of the arc-shaped clamping ring 61, and the other end is fixed on the fixed base 41. The elastic tensioning member 62 adopts a tension spring, and hooks are provided at both ends of the tension spring. Hanging holes can be provided on the connecting edge 612 and at designated positions of the fixed base 41 to facilitate the hanging and installation of the tension spring.

[0031] Furthermore, the umbilical cord outer diameter change test device under high water pressure also includes a camera 7, which is installed inside the hydraulic tank 1. The deformation state of the arc-shaped clamping ring 61 can be observed through the camera 7, and the observation effect is better. Among them, the camera 7 can also be cancelled. In this case, the hydraulic tank 1 needs to be made of a transparent material to facilitate direct observation by the test personnel.

[0032] Furthermore, there are multiple groups of abutment assemblies 6, each group of abutment assemblies 6 includes an arc-shaped clamping ring 61 and an elastic tensioning member 62, the diameter of each group of arc-shaped clamping rings 61 is smaller than the initial outer diameter of the umbilical cable sample 5, and each group of arc-shaped clamping rings 61 is installed above the umbilical cable sample 5 through the corresponding elastic tensioning member 62, and the diameter of each group of arc-shaped clamping rings 61 is set to decrease successively.

[0033] By designing arc-shaped clamping rings 61 of different sizes, water is injected into the hydraulic tank 1 through the hydraulic pump 2 and the water pressure is gradually increased. Whenever an arc-shaped clamping ring 61 is firstly sleeved on the umbilical cable sample 5, the pressure value of the pressure gauge 3 is read and recorded at this time, and multiple sets of data can be tested and recorded for efficient testing. Alternatively, when the number of arc-shaped clamping rings 61 is sufficient, the pressure of the hydraulic pump 2 can be controlled. When the pressure reaches the preset value, it is observed and recorded which arc-shaped clamping ring 61 is just clamped, so that the outer diameter change of umbilical cables of different sizes and different working water depths under different water pressures can be tested.

[0034] Example 2

[0035] As a test method for the change of the outer diameter of an umbilical cord under high water pressure provided by an embodiment of the present invention, the test device of embodiment 1 is used for testing, and the test method is as follows: S10: Select the umbilical cable sample 5 to be tested, seal both ends of the umbilical cable sample 5, and then fix it on the support base 4; S20: Install the abutment assembly 6, firstly buckle the groove 611 of the arc-shaped clamping ring 61 on the top of the umbilical cable sample 5, and then install the elastic tensioning member 62 on both sides of the arc-shaped clamping ring 61, one end of the elastic tensioning member 62 is connected to the arc-shaped clamping ring 61, and the other end is connected to the support seat 4; S30: inject water into the hydraulic tank 1 through the hydraulic pump 2 and gradually increase the water pressure until the arc-shaped clamp ring 61 is sleeved on the umbilical cable sample 5 and the pressurization is stopped. At this time, read and record the pressure value of the pressure gauge 3.

[0036] In step S10, a section of umbilical cable sample 5 of suitable length is cut from the entire umbilical cable product, and both ends of the sample are sealed to prevent water from entering the interior of the umbilical cable sample 5 under high water pressure environment, resulting in inaccurate testing. The support seat 4 includes a fixed base 41 and a support beam 42. The bottom of the hydraulic tank 1 is fixed with a fixed base 41, and the top of the fixed base 41 is provided with support beams 42 near both ends. The support beams 42 are arranged in a Y shape to form a limiting groove 421. The umbilical cable sample 5 is placed on the two support beams 42 and is confined in the limiting groove 421. The support beams 42 can support and fix the umbilical cable sample 5.

[0037] In step S20, the abutment assembly 6 includes an arc-shaped clamp 61 and an elastic tensioning member 62. The arc-shaped clamp 61 is arranged in a U-shape. The arc-shaped clamp 61 is made of a high elastic modulus alloy material and is not easily deformed. The diameter of the arc-shaped clamp 61 is smaller than the initial outer diameter of the umbilical cable sample 5. During installation, the arc-shaped clamp 61 is placed above the umbilical cable sample 5 and the groove 611 of the arc-shaped clamp 61 faces the umbilical cable sample 5. Then the elastic tensioning member 62 is installed, one end of the elastic tensioning member 62 is fixed on the connecting edge 612 of the arc-shaped clamp 61, and the other end is fixed on the fixed base 41. The elastic tensioning member 62 adopts a tension spring, and hooks are provided at both ends of the tension spring. Hanging holes can be provided at designated positions on the connecting edge 612 and the fixed base 41 to facilitate the hanging installation of the tension spring.

[0038] In step S30, there are multiple groups of abutment components 6, each group of abutment components 6 includes an arc-shaped clamping ring 61 and an elastic tensioning member 62, the diameter of each group of arc-shaped clamping ring 61 is smaller than the initial outer diameter of the umbilical cable sample 5, and each group of arc-shaped clamping ring 61 is installed on the top of the umbilical cable sample 5 through the corresponding elastic tensioning member 62, and the diameter of each group of arc-shaped clamping ring 61 is set in descending order; water is injected into the hydraulic tank 1 by the hydraulic pump 2 and the water pressure is gradually increased. Whenever an arc-shaped clamping ring 61 is firstly sleeved on the umbilical cable sample 5, the pressure value of the pressure gauge 3 is read and recorded at this time, and multiple groups of data can be tested and recorded for efficient testing. Or when the number of arc-shaped clamping rings 61 is sufficient, the pressure of the hydraulic pump 2 can be controlled. When the pressure reaches the preset value, it is observed and recorded which arc-shaped clamping ring 61 is just clamped, so that the outer diameter change of umbilical cables of different sizes and different working water depths under different water pressures can be tested.

[0039] For example, in this embodiment, the outer diameter of the umbilical cable sample 5 is 60 mm, and arc-shaped clamps 61 of different diameters such as 59.5 mm, 59.0 mm, 58.5 mm, 58.0 mm, and 57.5 mm are made respectively. The more the number of arc-shaped clamps 61 is, the more accurate the measured data and changes will be. The groove 611 of the arc-shaped clamp 61 is buckled on the top of the umbilical cable sample 5, and the two sides of the lower part are fixed on the support seat 4 with a group of elastic tensioning members 62 respectively. The elastic tensioning members 62 are in a tensioned state, and multiple arc-shaped clamps 61 can be arranged along the length direction of the umbilical cable sample 5. After the above components and tooling are installed, start the hydraulic pump 2, fill the hydraulic tank 1 with water and slowly increase the pressure, monitor the specific pressure value through the pressure gauge 3, and the outer diameter of the umbilical cable sample 5 will also slowly decrease. Through the camera 7 in the water pressure tank 1, when a certain water pressure value is reached, the outer diameter of the umbilical cable sample 5 is reduced to a certain size. Under the tension of the elastic tensioning member 62, the arc-shaped clamping ring 61 that is consistent with the outer diameter of the umbilical cable sample 5 at this moment will be instantly clamped into the umbilical cable sample 5, and the pressure value of the pressure gauge 3 and the diameter of the arc-shaped clamping ring 61 at this time are recorded. The diameter of the arc-shaped clamping ring 61 clamped into the umbilical cable sample 5 under this water pressure value is the outer diameter of the umbilical cable sample 5 under this water pressure. By comparing with the initial outer diameter of the umbilical cable sample 5 without water pressure, the change of the outer diameter of the umbilical cable under different water pressures can be obtained.

[0040] Continue to slowly increase the pressure of the hydraulic tank 1 through the hydraulic pump 2, observe the arc-shaped clamping ring 61 stuck in the umbilical cable sample 5 through the camera 7, record the pressure value of the pressure gauge 3 and the diameter of the corresponding arc-shaped clamping ring 61 at the moment of insertion, and record the third, fourth, and so on in sequence until the pressure is increased to the maximum pressure, or all the arc-shaped clamping rings 61 have been stuck in the umbilical cable sample 5, stop increasing the pressure, and end the test. The situation of the arc-shaped clamping ring 61 stuck on the umbilical cable sample 5 under different water pressures in the hydraulic tank 1 is determined to determine the change in the outer diameter of the umbilical cable under different water pressures, so as to realize the monitoring of the change in the outer diameter of the umbilical cable under different water pressures.

[0041] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for testing the change in outer diameter of an umbilical cord under high water pressure, characterized in that: include: A water pressure tank (1) is filled with water and pressurized by a water pressure pump (2) to simulate different water pressure environments; A pressure gauge (3) installed outside the water pressure tank (1) and used to monitor the internal pressure of the water pressure tank (1); A support seat (4) is fixed inside the hydraulic tank (1) and is used to place the umbilical cable sample (5); The abutment assembly (6) comprises an arc-shaped clamping ring (61) and an elastic tensioning member (62), wherein the diameter of the arc-shaped clamping ring (61) is smaller than the initial outer diameter of the umbilical cable sample (5), the arc-shaped clamping ring (61) is installed above the umbilical cable sample (5), and one end of the elastic tensioning member (62) is connected to the arc-shaped clamping ring (61) and the other end is connected to the support seat (4) so ​​as to confine the umbilical cable sample (5) between the support seat (4) and the arc-shaped clamping ring (61).

2. The device for testing the change in outer diameter of an umbilical cord under high water pressure as claimed in claim 1, characterized in that: The arc-shaped snap ring (61) is arranged in a U-shape, the groove (611) of the arc-shaped snap ring (61) is buckled on the top of the umbilical cable sample (5), the edge of the arc-shaped snap ring (61) is provided with a connecting edge (612), and the elastic tensioning member (62) is connected to the connecting edge (612).

3. The device for testing the change in outer diameter of an umbilical cord under high water pressure as claimed in claim 1, characterized in that: Elastic tensioning members (62) are provided on both sides of the arc-shaped clamping ring (61), and the umbilical cable sample (5) is located between the two elastic tensioning members (62).

4. The device for testing the change in outer diameter of an umbilical cord under high water pressure as claimed in claim 1, characterized in that: The support seat (4) comprises a fixed base (41) and a support beam (42), wherein the support beam (42) is fixed on the fixed base (41), and the umbilical cable sample (5) is placed on the support beam (42), and one end of the elastic tensioning member (62) is connected to the arc-shaped clamping ring (61), and the other end is connected to the fixed base (41).

5. The device for testing the change in outer diameter of an umbilical cord under high water pressure as claimed in claim 4, characterized in that: The support beam (42) is arranged in a Y shape to form a limiting groove (421), and the umbilical cable sample (5) is confined in the limiting groove (421).

6. The device for testing the change in outer diameter of an umbilical cord under high water pressure as claimed in claim 5, characterized in that: It also comprises a camera (7), wherein the camera (7) is installed inside the water pressure tank (1).

7. The device for testing the change in outer diameter of an umbilical cord under high water pressure as claimed in claim 1, characterized in that: The abutment components (6) are multiple groups, and each group of the abutment components (6) includes an arc-shaped clamping ring (61) and an elastic tensioning member (62). The diameter of each group of arc-shaped clamping rings (61) is smaller than the initial outer diameter of the umbilical cable sample (5), and each group of arc-shaped clamping rings (61) is installed above the umbilical cable sample (5) through the corresponding elastic tensioning member (62), and the diameter of each group of arc-shaped clamping rings (61) is set to decrease in sequence.

8. A method for testing the change in outer diameter of an umbilical cord under high water pressure, characterized in that: The test is performed using the test device described in any one of claims 1 to 7, and the test method is as follows: Selecting an umbilical cable sample (5) to be tested, sealing both ends of the sample, and then fixing the sample on a support seat (4); Install the abutment assembly (6), firstly buckle the groove (611) of the arc-shaped clamping ring (61) on the top of the umbilical cable sample (5), then install elastic tensioning members (62) on both sides of the arc-shaped clamping ring (61), one end of the elastic tensioning member (62) is connected to the arc-shaped clamping ring (61), and the other end is connected to the support seat (4); The hydraulic tank (1) is filled with water by means of a hydraulic pump (2) and the water pressure is gradually increased until the arc-shaped clamping ring (61) is sleeved on the umbilical cable sample (5) and the pressurization is stopped. At this time, the pressure value of the pressure gauge (3) is read and recorded.

9. The method for testing the change in outer diameter of an umbilical cord under high water pressure as claimed in claim 8, characterized in that: The arc-shaped snap ring (61) is arranged in a U-shape. The arc-shaped snap ring (61) is made of a high elastic modulus alloy material and is not easily deformed. A connecting edge (612) is provided on the edge of the arc-shaped snap ring (61), and the elastic tensioning member (62) is connected to the connecting edge (612).

10. The method for testing the change in outer diameter of an umbilical cord under high water pressure as claimed in claim 8, characterized in that: The abutment components (6) are multiple groups, each group of the abutment components (6) includes an arc-shaped clamping ring (61) and an elastic tensioning member (62), the diameter of each group of arc-shaped clamping rings (61) is smaller than the initial outer diameter of the umbilical cable sample (5), and each group of arc-shaped clamping rings (61) is installed above the umbilical cable sample (5) through the corresponding elastic tensioning member (62), and the diameter of each group of arc-shaped clamping rings (61) is set to decrease in sequence; water is injected into the water pressure tank (1) through the water pressure pump (2) and the water pressure is gradually increased. Whenever the arc-shaped clamping ring (61) is firstly sleeved on the umbilical cable sample (5), the pressure value of the pressure gauge (3) at this time is read and recorded.

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