Composite hose bending fatigue testing device and comprehensive testing equipment

Abstract

The utility model provides a composite hose bending fatigue testing device and comprehensive testing equipment, the composite hose bending fatigue testing device is provided with two turntables and eccentric connecting shafts on the turntables, and the two turntables are driven by a driving assembly to synchronously rotate clockwise and anticlockwise respectively; the two ends hung on the composite hose can be close to each other or far away from each other, bending of the composite hose can be achieved, electrical switching is needed in the whole test process, and the structure is simple. And through the driving of the single motor and the conversion of the reversing gear box, the two rotating discs can better perform synchronous rotation of positive and negative rotation, so that the bending of the composite hose meets the requirement of a test standard.

Description

Technical Field

[0001] The utility model relates to the technical field of performance testing devices for composite hoses, in particular to a composite hose bending fatigue testing device and comprehensive testing equipment. Background Art

[0002] LNG is liquefied natural gas, which is usually transported by LNG carriers after a series of ultra-low temperature liquefaction. The marine use environment is complex, and the required product performance requirements are relatively high. Since the temperature of LNG reaches -161.5℃, the safety and sealing performance during the transportation process are particularly important. As the main component of LNG transportation on LNG carriers, the performance of LNG cryogenic composite hoses directly affects the safety of the entire LNG transportation system. Therefore, LNG cryogenic composite hoses need to be fully verified before they can be used on board; and existing test equipment, especially bending fatigue test equipment, usually adopts mechanical linear reciprocating motion, and electrical switching is required during the entire test process, and its structure is complex; at the same time, in different standards, LNG cryogenic composite hoses need to undergo a variety of different tests, and existing test equipment is usually unable to perform a variety of different tests, which results in different tests requiring separate equipment, which not only takes up space, but also greatly increases the cost of the equipment. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a composite hose bending fatigue testing equipment and a comprehensive testing equipment to solve the above problems.

[0004] The utility model adopts the following scheme:

[0005] The present application provides a composite hose bending fatigue testing device, comprising a frame, a driving assembly arranged on the frame, and also comprising two turntables rotatably arranged on the frame; a connecting shaft eccentrically arranged on the two turntables; a connecting assembly movably arranged on the two connecting shafts, and the connecting assembly is used to seal and connect the two ends of the composite hose; the driving assembly is used to synchronously drive one of the turntables to rotate clockwise and the other turntable to rotate counterclockwise, so as to test the bending fatigue strength of the composite hose.

[0006] Furthermore, the connecting assembly includes a bearing seat, a blind plate connected to the bearing seat, and a bearing arranged on the bearing seat; the bearing is rotatably arranged on the connecting shaft; flanges connected to the blind plates are arranged at both ends of the composite hose; a filling port is arranged on one of the blind plates, and an exhaust port is arranged on the other blind plate.

[0007] Furthermore, a pressure detection device is provided on the filling port.

[0008] Furthermore, when the connection axes on the two turntables are farthest apart, the composite hose is in a straightened state; when the connection axes on the two turntables are closest apart, the composite hose reaches a desired bending radius.

[0009] Furthermore, the driving assembly includes a driving motor, a reversing gear box, a coupling, a bearing seat, a plurality of first transmission shafts, and two second transmission shafts; the motor is connected to one of the reversing gear boxes through a chain drive; the reversing gear box is connected to the first transmission shaft through the coupling, and is connected to the other reversing gear box; two bearing seats are installed on the shaft of each transmission shaft; the two second transmission shafts are rotatably arranged on the frame, one end of which is connected to the axis of the turntable, and the other end is connected to the reversing gear box by chain drive.

[0010] Furthermore, a sensor for counting the number of times the composite hose is bent is included.

[0011] A composite hose comprehensive testing device comprises the composite hose bending fatigue testing device and the anti-sway damping testing device; the anti-sway damping testing device comprises: two hanging brackets with adjustable relative positions placed on the frame, and a U-shaped groove arranged on the hanging brackets.

[0012] Furthermore, it also includes a torsion tensile testing device arranged below the frame; it includes a first joint fixing device fixedly arranged on one side below the frame, a guide rail arranged on the other side below the frame, a movable base slidably arranged on the guide rail, a rotating disk rotatably arranged on the movable base, a second joint fixing device connected to the rotating disk, a stretching mechanism for driving the movable base to move, and a torsion mechanism for driving the rotating disk to rotate.

[0013] By adopting the above technical solution, the utility model can achieve the following technical effects:

[0014] 1. Through the setting of two turntables and the setting of the eccentric connecting shaft on the turntable, the two turntables are driven by the driving assembly to rotate synchronously clockwise and counterclockwise respectively, so that the two ends of the composite hose suspended can be brought closer to or away from each other, and the composite hose can be bent. It does not require electrical switching during the entire test process, and the structure is simple.

[0015] 2. The drive of a single motor, through the conversion of the reversing gear box, enables the two turntables to better perform forward and reverse synchronous rotation.

[0016] 3. The entire equipment can perform multiple tests on composite pipes, integrating multiple functions in one, making it easy to operate and reducing space occupancy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the structure of a composite hose bending fatigue test device according to an embodiment of the utility model. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the structure of a composite hose bending fatigue test device according to an embodiment of the utility model. Figure 2 ;

[0020] Figure 3 It is a side structural schematic diagram of a composite hose bending fatigue testing device according to an embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of a composite hose comprehensive testing equipment according to the embodiment of the utility model. Figure 1 ;

[0022] Figure 5 It is a side structural schematic diagram of a composite hose comprehensive testing device according to an embodiment of the utility model;

[0023] Figure 6 This is a schematic diagram of the structure of a composite hose comprehensive testing device according to an embodiment of the utility model. Figure 2 ;

[0024] Icons: frame 1, turntable 2, connecting shaft 3, connecting assembly 4, composite hose 5, drive motor 6, reversing gear box 7, bearing seat 8, first transmission shaft 9, second transmission shaft 10, lifting bracket 11, U-shaped groove 12, first joint fixing device 14, guide rail 15, stretching mechanism 16, movable base 17, rotating disk 18, second joint fixing device 19, coupling 21, torsion mechanism 22, pressure relief valve 23, manual ball valve 24, thermometer 25, pressure gauge 26, water tank 27. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0026] Example

[0027] Combination Figures 1 to 3 As shown, this embodiment provides a composite hose bending fatigue testing device, including a frame 1, a driving assembly arranged on the frame 1, and also including two turntables 2 rotatably arranged on the frame 1; a connecting shaft 3 eccentrically arranged on the two turntables 2; a connecting assembly 4 movably arranged on the two connecting shafts 3, and the connecting assembly 4 is used to seal and connect the two ends of the composite hose 5; the driving assembly is used to synchronously drive one of the turntables 2 to rotate clockwise and the other turntable 2 to rotate counterclockwise, so as to test the bending fatigue strength of the composite hose 5.

[0028] Specifically, in this embodiment, the connecting component 4 includes a bearing seat 8, a blind plate connected to the bearing seat 8, and a bearing arranged on the bearing seat 8; the bearing is rotatably arranged on the connecting shaft 3; the connecting component is arranged so that the two ends of the composite hose can rotate synchronously when bending; flanges connected to the blind plates are arranged at both ends of the composite hose 5; a filling port is arranged on one of the blind plates, and an exhaust port is arranged on the other blind plate, and a pressure detection device is also arranged on the filling port to facilitate the filling of liquid nitrogen into the composite hose 5 and make the pressure in the composite hose 5 reach the test standard.

[0029] In this embodiment, the driving assembly includes a driving motor 6, a reversing gear box 7, a coupling 21, a bearing seat 8, multiple first transmission shafts 9, and two second transmission shafts 10; the motor is connected to one of the reversing gear boxes 7 through a chain drive; the reversing gear box 7 is connected to the first transmission shaft 9 through the coupling 21, and is connected to the other reversing gear box 7; two bearing seats 8 are installed on the shaft of each transmission shaft; the two second transmission shafts 10 are rotatably arranged on the frame 1, one end of which is connected to the axis of the turntable 2, and the other end is connected to the reversing gear box 7 by chain drive; the drive of a single motor, through the conversion of the reversing gear box 7, enables the two turntables 2 to better perform forward and reverse synchronous rotation.

[0030] The drive of a single motor, through the conversion of the reversing gear box 7, enables the two turntables 2 to better perform forward and reverse synchronous rotation, so that when the connecting shafts 3 on the two turntables 2 are farthest apart, the composite hose 5 is in a straight state; when the fatigue testing device is in a bending operation, when the connecting shafts 3 on the two turntables 2 are farthest apart, the composite hose 5 is in a straight state; when the connecting shafts 3 on the two turntables 2 are closest to each other, the composite hose 5 reaches the required bending radius.

[0031] Preferably, a sensor for counting the number of times the composite hose 5 is bent is further included, the sensor being arranged on the frame 1, and an induction element adapted to the sensor is eccentrically arranged on the shaft disc at the other end of the second transmission shaft 10. The setting of the counting sensor allows for a clearer and more intuitive understanding of the number of times the composite hose 5 is bent, so as to remind the tester when to collect corresponding data during the test.

[0032] By setting two turntables 2 and eccentric connecting shafts 3 on the turntables 2, the two turntables 2 are driven by the driving assembly to rotate synchronously clockwise and counterclockwise respectively, so that the two ends of the composite hose 5 can be brought closer to or farther away from each other, and the composite hose 5 can be bent. It needs electrical switching during the entire test process, and the structure is simple. The drive of a single motor, through the conversion of the reversing gear box 7, enables the two turntables 2 to better perform forward and reverse synchronous rotation, so that the bending of the composite hose 5 meets the requirements of the composite test standard.

[0033] The following is a detailed description of the steps of performing a bending fatigue test at low temperature using the composite hose bending fatigue test device:

[0034] S1: sealingly connecting the two ends of the composite hose 5 to the connecting assembly 4, and connecting the connecting assembly 4 to the connecting shaft 3 of the rotating disk 2;

[0035] S2: Filling liquid nitrogen into the composite hose 5 through the filling port;

[0036] S3: starting the driving assembly to make the two turntables 2 rotate synchronously clockwise and counterclockwise respectively;

[0037] S4: During the test, when the bending times reach a certain number, the corresponding data are recorded, including the tube pressure, the tube temperature at the head, middle and tail of the tube, the motor temperature of the detection device, the ambient temperature, etc.

[0038] Furthermore, in step S2, liquid nitrogen is added into the composite hose 5 so that the pressure inside the composite hose 5 reaches 0.5*MAWP.

[0039] The above test method adopts the composite hose bending fatigue test device, which is simple and convenient to operate while meeting the test standard requirements.

[0040] The utility model also provides a composite hose comprehensive testing device, such as Figures 4 to 5 As shown, it includes the composite hose 5 bending fatigue test device and the anti-sway damping test device; the anti-sway damping test device includes: two hanging brackets 11 with adjustable relative positions placed on the frame 1, and a U-shaped groove 12 arranged on the hanging bracket 11.

[0041] It can carry out an anti-swing damping test on the composite hose 5. Specifically, the flange end of the composite hose 5 is hung on the U-shaped groove 12 of the lifting bracket 11 by a forklift, so that it falls naturally to form a U shape on the vertical plane, and then liquid nitrogen is added to the composite hose 5. After it is filled, it is pressurized to 0.5Mpa. When the composite hose 5 is at the required test temperature and pressure, the lower part of the composite hose 5 is moved out of the vertical plane, and then released to make the composite hose 5 swing at the lowest characteristic frequency. Its full length is not restricted, and the motion trajectory of the composite hose 5 is recorded with a high-speed camera. It should be noted that in the above anti-swing damping test, the composite hose 5 is a composite hose 5 assembly after being sealed and connected to the connecting component 4.

[0042] During the test, the pressure, temperature and out-of-plane displacement or acceleration of the composite hose 5 body should be recorded, as well as the exponential decay of the swing amplitude. The composite hose 5 needs to be tested under normal temperature and low temperature conditions, under three pressure conditions of 0Mpa, 0.5Mpa and 1.05Mpa. For each temperature and pressure condition, the test should be repeated 3 times. Under normal temperature conditions, the filling medium is water, and the filling medium under low temperature conditions is liquid nitrogen.

[0043] Furthermore, if Figure 4 and Figure 6As shown, the composite hose 5 comprehensive test equipment also includes a torsion tensile test device arranged below the frame 1; it includes a first joint fixing device 14 fixedly arranged on one side below the frame 1, a guide rail 15 arranged on the other side below the frame 1, a movable base 17 slidably arranged on the guide rail 15, a rotating disk 18 rotatably arranged on the movable base 17, a second joint fixing device 19 connected to the rotating disk 18, a stretching mechanism 16 for driving the movable base 17 to move, and a torsion mechanism 22 for driving the rotating disk to rotate.

[0044] It can test the tensile stiffness and torsional stiffness of the composite hose 5. Specifically, when the tensile stiffness test is performed, one end of the composite hose 5 is sealed and connected to the first joint fixture 14, and the other end is sealed and connected to the second joint fixture 19. Then, liquid nitrogen / water is added to the composite hose 5, and after it is filled, it is pressurized to a specified pressure. When the hose is at the required test temperature and pressure, the second joint fixture 19 is constantly axially stretched at a set speed by the stretching mechanism 16. The composite hose 5 is subjected to a tensile force of 0-MWL (maximum working load) and MWL (maximum working load)-0, and this process lasts at least 2 minutes. From 0-MWL (maximum working load) and MWL (maximum working load)-0, its axial load slowly increases, and the required rate of increase is: 0-0.2*MWL-0.4*MWL-0.6*MWL-0.8*MWL-MWL.

[0045] During the test, the pressure, temperature, length and tensile force of the composite hose 5 before the test, the length and tensile force during the test, the length and tensile force after the test, and the calculated elongation of the flexible parts of the hose assembly and the rotation of the flexible parts of the hose assembly should be recorded. The composite hose 5 needs to be tested at normal temperature and low temperature, and the hose should be tested under three pressure conditions: 0Mpa, 0.5Mpa, and 1.05Mpa. For each temperature and pressure condition, the test should be repeated 3 times. Under normal temperature conditions, the filling medium is water, and the filling medium under low temperature conditions is liquid nitrogen.

[0046] When conducting the torsional stiffness test, one end of the composite hose 5 is sealed and connected to the first joint fixture 14, and the other end is sealed and connected to the second joint fixture 19. Then, liquid nitrogen / water is added to the composite hose 5, and after it is filled, it is pressurized to the specified pressure. When the composite hose 5 is at the required test temperature and pressure, the rotating disk 18 is rotated at a set speed by the torsion mechanism 22, so that the composite hose 5 is subjected to a torque of 0-MAAT (maximum allowable applied torsion) and MAAT (maximum allowable applied torsion)-0, and this process lasts for at least 2 minutes. From 0-MAAT (maximum allowable applied torsion) and MAAT (maximum allowable applied torsion), its torsion gradually increases, and the required rate of increase is: 0-0.25*MAAT-0.5*MAAT-MAAT.

[0047] During the test, the pressure, temperature, and initial length of the flexible parts of the composite hose 5 should be recorded; as well as the pressure, torsional load, elongation, and rotation of the flexible parts of the hose assembly. The composite hose 5 needs to be tested at room temperature and low temperature, and the hose should be tested under three pressure conditions: 0Mpa, 0.5Mpa, and 1.05Mpa. For each temperature and pressure condition, the test should be repeated 3 times. For each test, at least 3 different torsions should be applied to eliminate the hysteresis effect. The hose needs to be tested for one cycle clockwise and one counterclockwise. Under normal temperature conditions, the medium filled by the pipe connecting the water tank 27 is water; under low temperature conditions, the medium filled by the pipe connecting the liquid nitrogen tank is liquid nitrogen.

[0048] It should be noted that in the above tensile stiffness and torsional stiffness tests, the composite hose 5 is a composite hose 5 assembly after being sealed and connected to the connecting assembly 4, and a pressure relief valve 23 and a manual ball valve 24 are provided on one side of the second joint fixing device 19 to ensure that the pressure in the composite hose 5 is within the standard test pressure requirement. The pressure and temperature data during the test are detected by a pressure gauge and a thermometer.

[0049] The composite hose 5 comprehensive testing equipment can perform multiple tests on the composite hose, including bending fatigue test, anti-sway damping test, tensile stiffness test and torsional stiffness test. It integrates multiple functions in one, is easy to operate and occupies little space.

[0050] The above are only preferred implementations of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions under the concept of the present utility model belong to the protection scope of the present utility model.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" 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 invention 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 invention.

[0052] 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" 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 or an electrical connection; 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 the present invention can be understood according to specific circumstances.

[0054] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

Claims

1. A composite hose bending fatigue testing device, comprising a frame, a driving assembly arranged on the frame, characterized in that: It also includes two turntables rotatably arranged on the frame; a connecting shaft eccentrically arranged on the two turntables; a connecting component movably arranged on the two connecting shafts, and the connecting component is used to seal and connect the two ends of the composite hose; the driving component is used to synchronously drive one of the turntables to rotate clockwise and the other turntable to rotate counterclockwise, so as to test the bending fatigue strength of the composite hose.

2. The composite hose bending fatigue testing device according to claim 1, characterized in that: The connecting assembly includes a bearing seat, a blind plate connected to the bearing seat, and a bearing arranged on the bearing seat; the bearing is rotatably arranged on the connecting shaft; flanges connected to the blind plates are arranged at both ends of the composite hose; a filling port is arranged on one of the blind plates, and an exhaust port is arranged on the other blind plate.

3. The composite hose bending fatigue testing device according to claim 2, characterized in that: The filling port is provided with a pressure detection device.

4. The composite hose bending fatigue testing device according to claim 1, characterized in that: When the connection axes on the two rotating disks are farthest apart, the composite hose is in a straightened state; when the connection axes on the two rotating disks are closest apart, the composite hose reaches a desired bending radius.

5. The composite hose bending fatigue testing device according to claim 1, characterized in that: The driving assembly includes a driving motor, a reversing gear box, a coupling, a bearing seat, a plurality of first transmission shafts, and two second transmission shafts; the motor is connected to one of the reversing gear boxes through a chain drive; the reversing gear box is connected to the first transmission shaft through the coupling, and is connected to the other reversing gear box; two bearing seats are installed on the shaft of each transmission shaft; the two second transmission shafts are rotatably arranged on the frame, one end of which is connected to the axis of the turntable, and the other end is connected to the reversing gear box through a chain drive.

6. The composite hose bending fatigue testing device according to claim 1, characterized in that: A sensor for counting the number of times the composite hose is bent is also included.

7. A composite hose comprehensive testing equipment, characterized in that: It comprises a composite hose bending fatigue test device as described in any one of claims 1 to 6, and an anti-sway damping test device; the anti-sway damping test device comprises: two hanging brackets with adjustable relative positions placed on the frame, and a U-shaped groove arranged on the hanging bracket.

8. The composite hose comprehensive testing equipment according to claim 7, characterized in that: It also includes a torsion tensile testing device arranged below the frame; it includes a first joint fixing device fixedly arranged on one side below the frame, a guide rail arranged on the other side below the frame, a mobile base slidably arranged on the guide rail, a rotating disk rotatably arranged on the mobile base, a second joint fixing device connected to the rotating disk, a stretching mechanism for driving the mobile base to move, and a torsion mechanism for driving the rotating disk to rotate.

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