Bending rigidity testing machine

Abstract

The utility model discloses a bending rigidity testing machine, and belongs to the technical field of marine hose, submarine cable and umbilical cable detection. The bending rigidity testing machine comprises a main machine frame, a lifting assembly, a compression roller mechanism, a pressure sensor and a displacement sensor, the compression roller mechanism comprises a compression roller assembly and a compression roller fixing assembly; the lifting assembly is arranged in the middle of the bottom of the main machine frame and comprises an oil cylinder and a lifting base, and the lifting base is arranged above the oil cylinder. By arranging the lifting assembly and the compression roller fixing assembly, up-down movement of the lifting base and up-down movement of the compression roller assembly are achieved, the up-down space of a test can be adjusted, and the requirements of samples of different sizes for the test space are met; a pressure sensor and a displacement sensor are arranged for data acquisition, so that the bending radius and the bending rigidity are continuously calculated.

Description

Technical Field

[0001] The present application relates to a bending stiffness testing machine, which belongs to the technical field of marine hose, submarine cable and umbilical cable detection. Background Art

[0002] Submarine cables, umbilical cables, and submarine hoses are important equipment for marine power and signal transmission, oil and gas development and transmission. Submarine cables, umbilical cables, and submarine hoses are subject to tensile and bending loads under the action of environmental loads such as waves and currents. Therefore, bending stiffness is an important indicator for evaluating submarine cables, umbilical cables, and submarine flexible pipelines.

[0003] At present, my country's marine oil and gas development is gradually moving towards deep water. The role of submarine cables, umbilical cables, and submarine hoses is particularly important. The outer diameters of submarine cables, umbilical cables, and submarine hoses are different. Therefore, a bending stiffness testing machine is needed to meet the testing requirements of specimens of various sizes. Utility Model Content

[0004] In order to solve the above problems, the present application proposes a bending stiffness testing machine, which realizes the up and down movement of the lifting base and the up and down movement of the pressure roller assembly by setting a lifting assembly and a pressure roller fixing assembly, so that the upper and lower spaces of the test can be adjusted to meet the requirements of test space for specimens of different sizes; by setting pressure sensors and displacement sensors, data collection is performed to realize continuous calculation of bending radius and bending stiffness.

[0005] According to one aspect of the present application, a bending stiffness testing machine is provided, comprising a main frame, a lifting assembly, a pressure roller mechanism, a pressure sensor and a displacement sensor; the pressure roller mechanism comprises a pressure roller assembly and a pressure roller fixing assembly; the lifting assembly is arranged in the middle of the bottom of the main frame, the lifting assembly comprises an oil cylinder and a lifting base, and the lifting base is arranged above the oil cylinder.

[0006] Optionally, the pressure roller fixing assembly includes a bearing seat, a bearing holder and a welding holder, the welding holder is fixedly connected to the main frame; the welding holder is provided with a plurality of slots, the bearing holder is provided with a plurality of blocks, the blocks are engaged with the slots to realize the connection between the welding holder and the bearing holder; one end of the bearing seat is fixedly connected to the bearing holder, and the other end is rotatably connected to the pressure roller assembly.

[0007] Optionally, the pressure roller assembly includes a first pressure roller assembly, a second pressure roller assembly and a third pressure roller assembly; the first pressure roller assembly, the second pressure roller assembly and the third pressure roller assembly each include a pressure roller and a support roller, the support roller is sleeved on the pressure roller, and the support roller is fixedly connected to the pressure roller.

[0008] Optionally, guide grooves are provided on the four corners of the lifting base, and the guide grooves cooperate with the main frame to limit the lifting base.

[0009] Optionally, the supporting roller is provided with an inwardly concave arc surface.

[0010] Optionally, the pressure sensor is disposed between the piston rod of the oil cylinder and the lifting base to collect the pressure applied by the oil cylinder.

[0011] Optionally, the displacement sensor is connected to the lifting base via a displacement sensor bracket to measure the displacement of the sample.

[0012] Optionally, the first pressure roller assembly includes a first left pressure roller member and a first right pressure roller member, the first left pressure roller member and the first right pressure roller member are respectively arranged at the left and right ends of the lifting base, and the first left pressure roller member and the first right pressure roller member are fixedly connected to the lifting base through a bearing seat.

[0013] Optionally, the second pressure roller assembly includes a second left pressure roller member and a second right pressure roller member, and the second left pressure roller member and the second right pressure roller member are arranged on the left and right sides of the main frame through the pressure roller fixing assembly.

[0014] Optionally, the third pressure roller assembly includes a third left pressure roller component and a third right pressure roller component, and the third left pressure roller component and the third right pressure roller component are arranged on the left and right sides of the main frame through the pressure roller fixing assembly, the third left pressure roller component is arranged above the second left pressure roller component, and the third right pressure roller component is arranged above the second right pressure roller component.

[0015] The beneficial effects of this application include but are not limited to:

[0016] 1. The bending stiffness testing machine provided in the present application realizes the up and down movement of the lifting base and the up and down movement of the position of the pressure roller assembly by setting a lifting assembly and a pressure roller fixing assembly, so that the upper and lower spaces of the test can be adjusted to meet the requirements of test space for specimens of different sizes; by setting pressure sensors and displacement sensors, data collection is performed to realize continuous calculation of bending radius and bending stiffness.

[0017] 2. The bending stiffness testing machine provided in the present application comprises a bearing seat, a bearing holder and a welding holder. The welding holder is fixedly connected to the main frame. The welding holder is provided with a plurality of slots. The bearing holder is provided with a plurality of blocks. The blocks are engaged with the slots to realize the connection between the welding holder and the bearing holder. One end of the bearing seat is fixedly connected to the bearing holder, and the other end is rotatably connected to the pressure roller assembly. The position of the bearing holder on the welding holder can be adjusted by adjusting the engagement of the blocks with different slots, thereby realizing the movement of the pressure roller assembly in the vertical direction to adapt to various sample sizes.

[0018] 3. The bending stiffness testing machine provided in the present application, by setting a guide groove on the lifting base, the guide groove cooperates with the main frame to limit the lifting base, so that the lifting base can only move in the vertical direction but not in the horizontal direction, so as to facilitate the measurement of the bending stiffness of the sample in an upward manner.

[0019] 4. The bending stiffness testing machine provided in the present application is provided with a first pressing roller assembly, a second pressing roller assembly and a third pressing roller assembly. The first pressing roller assembly is arranged at the left and right ends of a lifting base and moves with the movement of the lifting base. The first pressing roller assembly contacts with the sample point, the lifting base rises, and the first pressing roller assembly pushes up the sample to measure the bending stiffness of the sample.

[0020] 5. The bending stiffness testing machine provided in the present application has a pressure roller and a bearing seat rotatably connected to each other, which is convenient for the relative movement of the sample and the pressure roller. The supporting roller is mounted on the pressure roller, and the supporting roller is fixedly connected to the pressure roller. The supporting roller is provided with an inwardly concave arc surface, and the roller surface with the arc surface is used as the fulcrum, that is, the contact point of the sample. It can be self-centered and adopts a rolling movement method to reduce the friction between the test and the supporting roller, thereby ensuring the accuracy of the test force and reducing the damage to the sample, so that the test result is closer to the ideal state. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of a bending stiffness testing machine involved in an embodiment of the present application;

[0023] Figure 2 It is a top view schematic diagram of a bending stiffness testing machine involved in an embodiment of the present application;

[0024] Figure 3 It is a front view schematic diagram of a bending stiffness testing machine involved in an embodiment of the present application;

[0025] Figure 4 It is a partial enlarged schematic diagram of part A of the bending stiffness testing machine involved in the embodiment of the present application;

[0026] Figure 5 This is a schematic diagram of the structure of the pressure roller and the support roller of the bending stiffness testing machine involved in the embodiment of the present application.

[0027] List of parts and reference numerals:

[0028] 1. Mainframe; 2. Oil cylinder; 3. Lifting base; 4. Bearing seat; 5. Bearing holder; 6. Welding holder; 7. Slot; 8. Block; 9. Pressure roller; 10. Support roller; 11. Guide groove; 12. First left pressure roller member; 13. First right pressure roller member; 14. Second left pressure roller member; 15. Second right pressure roller member; 16. Third left pressure roller member; 17. Third right pressure roller member; 18. Displacement sensor. DETAILED DESCRIPTION

[0029] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0030] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0032] In addition, in the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0036] refer to Figure 1-Figure 5 The embodiment of the present application discloses a bending stiffness testing machine, including a main frame 1, a lifting assembly, a pressure roller mechanism, a pressure sensor and a displacement sensor 18; the pressure roller mechanism includes a pressure roller assembly and a pressure roller fixing assembly; the lifting assembly is arranged in the middle of the bottom of the main frame 1, and the lifting assembly includes a cylinder 2 and a lifting base 3, and the lifting base 3 is arranged above the cylinder 2.

[0037] Specifically, by setting up a lifting assembly and a pressure roller fixing assembly, the lifting base 3 can be moved up and down and the position of the pressure roller assembly can be moved up and down, so that the upper and lower spaces of the test can be adjusted to meet the requirements of test space for specimens of different sizes; by setting up a pressure sensor and a displacement sensor 18, data collection is performed to realize continuous calculation of the bending radius and bending stiffness.

[0038] Specifically, the thrust of the oil cylinder 2 is not less than 300 kN, and the maximum stroke of the oil cylinder 2 is 0.5 m.

[0039] Specifically, the main frame 1 is a horizontal frame structure, which is welded with heavy-duty materials to ensure high overall rigidity.

[0040] As an embodiment, the pressure roller fixing assembly includes a bearing seat 4, a bearing holder 5 and a welding holder 6, and the welding holder 6 is fixedly connected to the main frame 1; the welding holder 6 is provided with a plurality of slots 7, and the bearing holder 5 is provided with a plurality of blocks 8, and the blocks 8 are engaged with the slots 7 to realize the connection between the welding holder 6 and the bearing holder 5; one end of the bearing seat 4 is fixedly connected to the bearing holder 5, and the other end is rotatably connected to the pressure roller assembly.

[0041] Specifically, the welding base 6 is fixedly connected to the main frame 1, a plurality of slots 7 are provided on the welding base 6, a plurality of blocks 8 are provided on the bearing base 5, and the blocks 8 are engaged with the slots 7 to realize the connection between the welding base 6 and the bearing base 5; one end of the bearing base 4 is fixedly connected to the bearing base 5, and the other end is rotatably connected to the pressure roller assembly; the position of the bearing base 5 on the welding base 6 can be adjusted by adjusting the engagement of the blocks 8 with different slots 7, thereby realizing the movement of the pressure roller assembly in the vertical direction to adapt to various sample sizes.

[0042] Specifically, the present application does not make specific limitations on the number and shape of the card slots 7 and the card blocks 8, and those skilled in the art may make their own choices based on actual conditions.

[0043] Specifically, the present application does not make any specific limitation on the connection method between the bearing seat 4 and the bearing holder 5. Technical personnel in this field can select a suitable connection method according to actual conditions, including but not limited to welding, bolt-tightening connection, clamping, etc.

[0044] As an embodiment, the pressure roller assembly includes a first pressure roller assembly, a second pressure roller assembly and a third pressure roller assembly; the first pressure roller assembly, the second pressure roller assembly and the third pressure roller assembly all include a pressure roller 9 and a support roller 10, the support roller 10 is sleeved on the pressure roller 9, and the support roller 10 is fixedly connected to the pressure roller 9.

[0045] Specifically, the present application does not make specific limitations on the lengths of the pressing roller 9 and the supporting roller 10, and those skilled in the art may make selections based on actual conditions.

[0046] Specifically, a support roller 10 is sleeved on the pressure roller 9, the support roller 10 is fixedly connected to the pressure roller 9, and the pressure roller 9 is rotatably connected to the bearing seat 4, so as to facilitate the relative movement of the sample and the support roller 10, and use a rolling movement method to reduce the friction between the test and the support roller 10, thereby ensuring the accuracy of the test force.

[0047] As an implementation mode, guide grooves 11 are provided on the four corners of the lifting base 3 , and the guide grooves 11 cooperate with the main frame 1 to achieve the limitation of the lifting base 3 .

[0048] Specifically, by setting a guide groove 11 on the lifting base 3 to cooperate with the main frame 1, the lifting base 3 is limited so that the lifting base 3 can only move in the vertical direction but not in the horizontal direction, so as to measure the bending stiffness of the sample in an upward manner.

[0049] As an implementation mode, the supporting roller 10 is provided with an inwardly concave arc surface.

[0050] Specifically, an inwardly concave arc surface is provided on the support roller 10, and the roller surface with the arc surface is used as a fulcrum to reduce the friction between the sample and the support roller 10, ensure the accuracy of the force, and also reduce the damage to the sample, so that the experimental results are closer to the ideal state.

[0051] Specifically, the present application does not make a specific limitation on the diameter of the arc surface. Those skilled in the art may select an arc surface of a suitable diameter according to actual conditions to meet the needs of cutting and splicing specimens of different diameters and implement bending tests of specimens of different diameters.

[0052] As an implementation mode, the pressure sensor is disposed between the piston rod of the oil cylinder 2 and the lifting base 3 to collect the pressure applied by the oil cylinder 2 .

[0053] Specifically, the measuring range of the pressure sensor is 300 kN, the accuracy of the pressure sensor requires the force value to be ≤ ±0.3% FS, and the display accuracy is the force value of 0.1 kN.

[0054] As an implementation mode, the displacement sensor 18 is connected to the lifting base 3 via a displacement sensor bracket to measure the displacement of the sample.

[0055] Specifically, the displacement sensor support is fixedly connected to the lifting base 3. The displacement sensor uses the fixed pulley principle, and the rope end uses a counterweight block to make the displacement sensor produce longitudinal changes to measure the displacement of the sample.

[0056] Specifically, by providing the displacement sensor 18, the displacement value can be continuously recorded during the lifting process of the sample, so as to realize continuous calculation of the bending radius and the bending stiffness.

[0057] As an embodiment, the first pressure roller assembly includes a first left pressure roller component 12 and a first right pressure roller component 13, and the first left pressure roller component 12 and the first right pressure roller component 13 are respectively arranged at the left and right ends of the lifting base 3, and the first left pressure roller component 12 and the first right pressure roller component 13 are fixedly connected to the lifting base 3 through a bearing seat 4.

[0058] Specifically, the first left pressure roller 12 and the first right pressure roller 13 are arranged at the left and right ends of the lifting base 3, and rise and fall with the lifting base 3. When the lifting base 3 rises, the first left pressure roller 12 and the first right pressure roller 13 contact the sample to apply pressure to the sample.

[0059] As an implementation manner, the second pressure roller assembly includes a second left pressure roller member 14 and a second right pressure roller member 15 , and the second left pressure roller member 14 and the second right pressure roller member 15 are arranged on the left and right sides of the main frame 1 through a pressure roller fixing assembly.

[0060] As an embodiment, the third pressure roller assembly includes a third left pressure roller component 16 and a third right pressure roller component 17. The third left pressure roller component 16 and the third right pressure roller component 17 are arranged on the left and right sides of the main frame 1 through a pressure roller fixing assembly. The third left pressure roller component 16 is arranged above the second left pressure roller component 14, and the third right pressure roller component 17 is arranged above the second right pressure roller component 15.

[0061] Specifically, the second left pressure roller member 14 and the third left pressure roller member 16 are arranged on the left side of the main frame 1 through a pressure roller fixing assembly, and the second right pressure roller member 15 and the third right pressure roller member 17 are arranged on the right side of the main frame 1 through a pressure roller fixing assembly. The second left pressure roller member 14, the second right pressure roller member 15, the third left pressure roller member 16 and the fourth right pressure roller member can adjust the connection position of the bearing holder 5 and the welding holder 6 to adjust the distance between the second left pressure roller member 14 and the third left pressure roller member 16, and between the second right pressure roller member 15 and the third right pressure roller member 17 to adapt to the requirements of test space for samples of different sizes.

[0062] The present application provides a bending stiffness testing machine, and the working process is as follows: by adjusting the connection position of the welding holder 6 and the bearing holder 5, the space between the second roller assembly and the third roller assembly is adjusted to adapt to the size of the sample, and the sample is placed flat between the second roller assembly and the third roller assembly, and the height of the lifting base 3 is adjusted so that the first left roller member 12 and the first right roller member are in contact with the sample, and the oil cylinder 2 pushes the lifting base 3 to rise, and the first left roller member 12 and the first right roller member 13 push the sample; the second roller assembly and the third roller assembly use the roller surface with an arc surface as the fulcrum, which can be self-centered, and the four curved fulcrums contacted by the sample are all rotatable roller designs, which are convenient for the relative movement of the sample and the support roller 10. The test force is moved by rolling to reduce the friction between the test and the support roller 10, ensuring the accuracy of the test force and reducing the damage to the sample, so that the test result is closer to the ideal state; the stroke of the cylinder 2 is much larger than the sum of the deformation of the sample and the diameter of the sample. Considering the influence of the sample gravity, the bending stiffness is measured by the top-up method. The design thrust is not less than 300kN, which is achieved by 1 cylinder 2, with a maximum stroke of 0.5m. The pressure sensor collects the pressure applied by the cylinder 2. At the same time, during the lifting process of the sample, the h value is continuously recorded through the displacement sensor 18 to realize the continuous calculation of the bending radius and bending stiffness. During the test, the corresponding force value can be continuously recorded. The accuracy requirement of the test sensor is that the force value is ≤±0.3% FS, displacement ≤±0.1mm, display accuracy is force value 0.1kN, displacement 0.1mm, thrust lifting rate is continuously adjustable, and the extra stroke is used to adjust the test space; through the test data acquisition system, the test parameters and curves can be displayed in real time, and the test results, such as test date and time, ambient temperature, air pressure, test thrust, bending radius, bending stiffness, etc., can be stored and recorded; the test database is automatically established, and the test data can be automatically saved after the test, and the test report can be queried and printed at any time.

[0063] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0064] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A bending stiffness testing machine, characterized in that: It includes a main frame, a lifting component, a pressure roller mechanism, a pressure sensor and a displacement sensor; the pressure roller mechanism includes a pressure roller assembly and a pressure roller fixing assembly; the lifting component is arranged in the middle of the bottom of the main frame, the lifting component includes an oil cylinder and a lifting base, and the lifting base is arranged above the oil cylinder.

2. A bending stiffness testing machine according to claim 1, characterized in that: The pressure roller fixing assembly includes a bearing seat, a bearing holder and a welding holder, wherein the welding holder is fixedly connected to the main frame; the welding holder is provided with a plurality of slots, and the bearing holder is provided with a plurality of blocks, and the blocks are engaged with the slots to realize the connection between the welding holder and the bearing holder; one end of the bearing seat is fixedly connected to the bearing holder, and the other end is rotatably connected to the pressure roller assembly.

3. A bending stiffness testing machine according to claim 1, characterized in that: The pressure roller assembly includes a first pressure roller assembly, a second pressure roller assembly and a third pressure roller assembly; the first pressure roller assembly, the second pressure roller assembly and the third pressure roller assembly each include a pressure roller and a supporting roller, the supporting roller is sleeved on the pressure roller, and the supporting roller is fixedly connected to the pressure roller.

4. A bending stiffness testing machine according to claim 1, characterized in that: The four corners of the lifting base are provided with guide grooves, and the guide grooves cooperate with the main frame to achieve the limit of the lifting base.

5. A bending stiffness testing machine according to claim 3, characterized in that: The supporting roller is provided with an inwardly concave arc surface.

6. A bending stiffness testing machine according to claim 1, characterized in that: The pressure sensor is arranged between the piston rod of the oil cylinder and the lifting base to collect the pressure applied by the oil cylinder.

7. A bending stiffness testing machine according to claim 1, characterized in that: The displacement sensor is connected to the lifting base through a displacement sensor bracket to measure the displacement of the sample.

8. A bending stiffness testing machine according to claim 3, characterized in that: The first pressure roller assembly includes a first left pressure roller member and a first right pressure roller member, the first left pressure roller member and the first right pressure roller member are respectively arranged at the left and right ends of the lifting base, and the first left pressure roller member and the first right pressure roller member are fixedly connected to the lifting base through a bearing seat.

9. A bending stiffness testing machine according to claim 8, characterized in that: The second pressure roller assembly includes a second left pressure roller component and a second right pressure roller component, and the second left pressure roller component and the second right pressure roller component are arranged on the left and right sides of the main frame through the pressure roller fixing assembly.

10. A bending stiffness testing machine according to claim 9, characterized in that: The third pressure roller assembly includes a third left pressure roller component and a third right pressure roller component, and the third left pressure roller component and the third right pressure roller component are arranged on the left and right sides of the main frame through the pressure roller fixing assembly, the third left pressure roller component is arranged above the second left pressure roller component, and the third right pressure roller component is arranged above the second right pressure roller component.

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