CN113029814A - Experimental device for simulating bending fatigue of marine flexible hose - Google Patents
Experimental device for simulating bending fatigue of marine flexible hose Download PDFInfo
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- CN113029814A CN113029814A CN202110383006.1A CN202110383006A CN113029814A CN 113029814 A CN113029814 A CN 113029814A CN 202110383006 A CN202110383006 A CN 202110383006A CN 113029814 A CN113029814 A CN 113029814A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
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- G01N2203/0019—Compressive
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The invention discloses an experimental device for simulating bending fatigue of an ocean flexible hose, which comprises an end part movable clamp, a mechanical pressurization load system, a pressurization and cyclic pressurization system, a medium heating and thermal circulation system and a control system, wherein the end part movable clamp is connected with the end part of the end part movable clamp; the end part movable clamps are clamped on the two end parts of the hose; the mechanical pressurization load system can apply load to the middle part of the hose; the pressurizing and circulating pressurizing system pressurizes and conveys a medium with a set temperature into the hose and can circulate the pressurized medium in the hose; the medium heating and heat circulating system heats the medium conveyed into the hose to a set temperature and keeps the medium temperature to the set temperature. The invention can simulate the bending fatigue of mechanical pressurization load for pipes with different calibers, and can simulate the fatigue condition of cyclic pressurization (pressure relief) load for pipes with different angles and calibers by replacing the fixed die.
Description
Technical Field
The invention relates to the marine petroleum equipment technology, in particular to an experimental device for simulating a marine flexible hose fatigue test.
Background
There are more than 300 submarine pipelines, more than 6000km, in medium sea oil, and more than 30 pipelines which are or will reach the service life. Failure of a subsea pipeline can have serious consequences. The traditional method for maintaining the failed pipeline is influenced by factors such as seasons, weather, shipping time and the like, and has long maintenance period and high cost. Compared with the traditional maintenance mode, the short-distance sea pipe lining composite hose repairing technology has the advantages of short period and less occupied resources, can solve the problem of corrosion of the prior pipeline, prolongs the service life of the pipeline, can effectively reduce the operation cost in the environment with low oil price, and achieves the purposes of cost reduction and efficiency improvement, thereby being more and more popular with the first party.
In the long-term service process of the flexible hose, due to the viscoelasticity of the high polymer material, the polymer material of the lining layer can creep continuously to generate fatigue. Under the action of service temperature and pressure, the deformation of the lining layer material is gradually increased along with the time, so that the structural damage of the lining layer material is caused, and the service life of the flexible hose is shortened. In the process of selecting the material of the lining composite hose, not only the chemical property of the inner layer of the pipe needs to be considered, but also the physical and mechanical properties of the material need to be considered. The composite hose is more easily damaged at a joint and a stress concentration part under the action of mechanical pressurization load and cyclic pressurization (decompression) load, so that the fatigue test of the pipe after the hose is produced is very important. In the sea pipes repaired by the lining repair technology of Malaysia oil company, part of the lining pipes cause pipeline leakage due to fatigue of the bent parts. The fatigue testing machine which simulates the pressurization condition of the flexible pipe as much as possible is very necessary based on the trial production, the existing fatigue testing machine cannot effectively simulate the fatigue condition of the flexible hose, and the device can make up for the defect.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an experimental device for simulating the bending fatigue of an ocean flexible hose, which can simulate the bending fatigue of mechanical pressurization load on pipes with different calibers, and can simulate the fatigue condition of cyclic pressurization (pressure relief) load on the pipes with different angles and calibers by replacing a fixed mould.
The technical scheme adopted by the invention is as follows: an experimental apparatus for simulating bending fatigue of a marine flexible hose, the experimental apparatus comprising:
end movable clamps clamped on two ends of the hose;
a mechanical pressure loading system capable of loading the middle of the hose;
a pressurization and circulation pressurization system which pressurizes and conveys a medium of a set temperature into the hose and is capable of circulating the pressurized medium in the hose;
the medium heating and heat circulating system heats the medium conveyed into the hose to a set temperature and keeps the medium temperature to the set temperature; and the number of the first and second groups,
the control system is connected with the pressurization and circulation pressurization system to control and record the pressure applied to the medium by the pressurization and circulation pressurization system and monitor the pressure state of the hose, the control system is connected with the medium heating and heat circulation system to control and record the temperature set by the medium heating and heat circulation system for the medium and monitor the temperature state of the hose, and the control system can measure and record the strain of the hose at each part during the test.
Further, the experimental device further comprises a fixed mold, the fixed mold is bent to a set angle, and in the cyclic internal pressure loading test of the hose, the hose is arranged in the fixed mold in a penetrating mode, so that the hose can be bent to the set angle.
Further, the end part movable clamp is of an annular structure and is clamped at the end part of the hose; the end part movable clamp is connected to the fixed base and is in rotating connection with the fixed base, so that the end part movable clamp can follow up the bending of the hose and automatically adjust the angle to match the movement of the hose, and the end part movable clamp is in clearance connection with the hose, so that the hose is allowed to slide in the end part movable clamp in the test process, and the displacement generated by the bending of the hose is compensated.
Furthermore, hose joints are arranged at two end parts of the hose, and the end part movable clamp is clamped on the hose joints.
Further, the experimental device further comprises a central fixed end clamp, the central fixed end clamp is clamped in the middle of the hose, and the mechanical pressurization load system is connected with the central fixed end clamp.
Further, the mechanical compression loading system includes:
the motor/reduction gearbox is connected with the control system;
a fixed arm;
the first end of the long arm is rotatably connected to the fixed arm;
the first end of the small arm is rotatably connected with the second end of the long arm, and the second end of the small arm is fixedly connected to the output shaft of the motor/reduction gearbox; and the number of the first and second groups,
the first end of the swinging arm is rotatably connected to the long arm, and the second end of the swinging arm is fixedly connected to the central fixed end clamp;
the motor/reduction gearbox drives the small arm to rotate forwards and backwards so as to drive the long arm to swing up and down, so that the swinging arm drives the center of the hose to move up and down, and the bending fatigue test of the hose is simulated.
Further, the pressurization and circulation pressurization system comprises:
a pressure pump;
the pressure medium inlet and the pressure circulating medium outlet are respectively arranged at two ends of the hose, wherein the pressure medium inlet is connected with the outlet of the pressure pump through a pipeline;
the pressurized medium circulating pipeline is connected with a heating container of the medium heating and heat circulating system through the pressurized medium circulating pipeline; and the number of the first and second groups,
a pressure sensor provided at an end of the pressurized circulating medium outlet;
wherein, the booster pump and the pressure sensor are both connected with the control system.
Further, the medium heating and heat cycle system includes:
a heating container in which the medium is stored, and which is connected to an inlet of the pressurizing pump;
a first temperature sensor disposed within the heating vessel;
an electric heater disposed within the heating container; and the number of the first and second groups,
a second temperature sensor provided at an end of the pressurized circulating medium outlet;
wherein the first temperature sensor, the electric heater and the second temperature sensor are all connected with the control system.
Further, the control system includes:
control and data acquisition;
the control and data acquisition circuit is connected with a first temperature sensor and an electric heater in the medium heating and heat circulating system through the automatic temperature control circuit;
the automatic pressurization control line is used for controlling and acquiring data, and the control and data acquisition is connected with a pressurization pump in the pressurization and circulation pressurization system through the automatic pressurization control line;
the control and data acquisition system comprises a loading control circuit, a motor/reduction gearbox and a mechanical pressurization load system, wherein the control and data acquisition system is connected with the motor/reduction gearbox in the mechanical pressurization load system through the loading control circuit;
the pipe state monitoring line is used for connecting the control and data acquisition with a pressure sensor of the pressurization and circulation pressurization system and a second temperature sensor of the medium heating and heat circulation system; and the number of the first and second groups,
the flexible pipe strain gauge comprises a strain gauge and a strain measurement line, wherein the strain gauge is pasted on a part where the strain of the flexible pipe needs to be measured, and the control and data acquisition are carried out through the strain measurement line and the strain gauge.
Furthermore, the experimental device also comprises a video monitoring system capable of recording a video of the test process, wherein the video monitoring system comprises a camera and a video monitoring circuit, the camera is arranged on the hose test site, and the camera is connected with the control system through the video monitoring circuit.
The invention has the beneficial effects that:
(1) the conventional bending fatigue test device cannot simulate the fatigue of the bent part of the flexible hose caused by mechanical pressurization load and cyclic pressurization (decompression) load, but the invention can effectively simulate the fatigue condition of the marine flexible hose at the bent part under two loads, thereby effectively predicting the service life of the lining pipe.
(2) The existing bending fatigue test device cannot truly reflect the load of the hose at the bending part and cannot be attached to the actual working condition, and the test device can accurately evaluate the influence of mechanical pressurization load and cyclic pressurization (decompression) load on the service life of the hose.
(3) The experimental device can shorten the simulation time by increasing the loading frequency.
(4) The experimental device fills the blank of fatigue simulation of the bending part of the lining pipe in the current market, and provides technical support for popularization and application of the lining pipe repairing technology in the sea oil.
Drawings
FIG. 1: the invention has a schematic structure;
FIG. 2: the invention discloses a structural schematic diagram of a fixed die (used for cyclic internal pressure loading fatigue test);
the attached drawings are marked as follows:
1-fixed base; 2-center fixed end clamp;
3-end movable clamp; 4-fixing the mould;
5-hose connector; 6-inlet for pressurized medium;
7-outlet for pressurized circulating medium; 8-pressurized medium circulation line;
9-fixed arm; 10-long arm;
11-swing arm; 12-small arm;
13-Motor/reduction gearbox; 14-heating the vessel;
15-first temperature sensor; 16-electric heater;
17-a pressure pump; 18-a second temperature sensor;
19-pressure sensor; 20-control and data acquisition;
21 — automatic temperature control circuit; 22-automatic pressurization control circuit;
23-strain measurement circuitry; 24-camera;
25-video monitoring line; 26-load control line;
27-pipe condition monitoring line.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
as shown in figures 1 and 2, the experimental device for simulating the bending fatigue of the marine flexible hose can be used for a mechanical pressurization load bending fatigue test and a cyclic internal pressure loading fatigue test.
The experimental device comprises a fixed base 1, a replaceable central fixed end clamp 2, a replaceable end movable clamp 3, a fixed mould 4, a hose connector 5, a pressurizing and circulating pressurizing system, a mechanical pressurizing load system, a medium heating and heat circulating system, a video monitoring system and a control system.
The fixed base 1 is used for providing structural support for the experimental device and ensuring the stability of the equipment during the test. And a left supporting device and a right supporting device are arranged on the fixed base 1.
The central fixed end clamp 2 is clamped in the middle of the hose, the mechanical pressurization load system is connected with the central fixed end clamp 2 and is driven by a motor/reduction gearbox 13 of the mechanical pressurization load system for loading. The center fixing end clamp 2 can be replaced by a proper clamp according to the outer diameter of a test sample.
The end part movable clamp 3 is of an annular structure, is clamped on the hose joints 5 at two ends of the hose and is used for clamping the hose to be tested. The two end part movable clamps 3 are respectively connected to the left and right supporting devices of the fixed base 1 and are rotatably connected with the left and right supporting devices, so that the end part movable clamps 3 can follow the bending of the hose and automatically adjust the angle to match the movement of the hose, and the end part movable clamps 3 are in clearance connection with the hose, so that the hose can slide in the end part movable clamps 3 in the test process to compensate the displacement generated by the bending of the hose. The end movable clamp 3 may also be fixed during cyclic internal pressure loading fatigue testing.
The fixed die 4 is used only in a cyclic internal pressure loading fatigue test, is used for simulating the bending angle of the hose in the process, and is fixed. The fixed mould 4 is bent to a set angle, in the cyclic internal pressure loading test of the hose, the hose is arranged in the fixed mould 4 in a penetrating mode, so that the hose can be bent to the set angle, different fixed moulds 4 can be developed according to different angles, and the fatigue condition of cyclic pressurization (pressure relief) load of pipes with different angles and calibers is simulated. In the cyclic internal pressure loading test, the hose is bent upwards under the action of the fixed mold 4, the central fixed end clamp 2 can be clamped on the fixed mold 4, and the central fixed end clamp 2 is fixed at a proper height by the mechanical pressurization loading system so as to fix the central position of the hose, so that the stability of the hose and the fixed mold 4 in the test process is maintained.
The hose joints 5 are connected to both ends of the hose, and the end movable clamps 3 are clamped on the inner sides of the hose joints 5. The hose connector 5 is to be fitted to a pipe and is provided by a test manufacturer.
The pressurizing and circulating pressurizing system pressurizes, conveys and monitors the medium reaching the set temperature in the test. The pressurizing and circulating pressurizing system comprises a pressurizing pump 17, a pressurizing medium inlet 6, a pressurizing circulating medium outlet 7, a pressurizing medium circulating pipeline 8 and a pressure sensor 19; the pressure pump 17 is an electric pump and is used for circulating a medium in the test piece to keep a set internal pressure, and also can freely set an initial pressure and a final pressure according to test requirements, and automatically run for a long time to simulate the influence of pressure period change on the marine flexible hose in the application process; the pressurized medium inlet 6 and the pressurized circulating medium outlet 7 are respectively arranged at two ends of a hose, the pressurized medium inlet 6 is connected with an outlet of a pressurized pump through a pipeline, and the pressurized circulating medium outlet 7 is connected with the heating container 14 through a pressurized medium circulating pipeline 8; the pressure sensor 19 is arranged at the end of the pressurized circulating medium outlet 7; wherein the pressure pump 17 and the pressure sensor 19 are both connected to the control system.
The mechanical pressurization loading system can apply a load to the middle of the hose. The mechanical pressurization load system comprises a fixed arm 9, a long arm 10, a swing arm 11, a small arm 12 and a motor/reduction gearbox 13; the fixing arm 9 is fixed on the fixing base 1; the first end of the long arm 10 is rotatably connected to the fixed arm 9; the first end of the small arm 12 is rotatably connected with the second end of the long arm 10, and the second end of the small arm 12 is fixedly connected to the output shaft of the motor/reduction gearbox 13; a first end of the swing arm 11 is rotatably connected to the long arm 10, and a second end of the swing arm 11 is fixedly connected to the central fixed end clamp 2; the motor/reduction gearbox 13 is connected with the control system and used for providing mechanical pressurization load, the motor/reduction gearbox 13 drives the small arm 12 to rotate forwards and backwards to drive the long arm 10 to swing upwards and downwards so as to drive the center of the hose to move upwards and downwards through the swing arm 11, namely, the hose is continuously changed in a bending state and a straightening state, and therefore the bending fatigue test of the hose is simulated.
The medium heating and heat circulating system is mainly used for heating and monitoring the temperature of the medium conveyed into the hose. The medium heating and heat circulating system comprises a heating container 14, a first temperature sensor 15, an electric heater 16 and a second temperature sensor 18; the heating container 14 stores the medium therein, and the heating container 14 is connected to an inlet of the pressurizing pump 17; the first temperature sensor 15 and the electric heater 16 are disposed inside the heating container 14; the second temperature sensor 18 is arranged at the end of the pressurized circulating medium outlet 7; wherein the first temperature sensor 15, the electric heater 16 and the second temperature sensor 18 are all connected with the control system.
The control system includes control and data acquisition 20, automatic temperature control line 21, automatic pressurization control line 22, loading control line 26, tube condition monitoring line 27, strain gauge and strain measurement line 23. The control and data acquisition 20 is connected with the first temperature sensor 15 and the electric heater 16 in the medium heating and heat circulation system through the automatic temperature control line 21, the control and data acquisition 20 is connected to the pressurization pump 17 in the pressurization and circulation pressurization system through the automatic pressurization control line 22, the control and data acquisition 20 is connected with the pressure sensor 19 of the pressurization and circulation pressurization system and the second temperature sensor 18 of the medium heating and heat circulation system through the pipe state monitoring line 27, the control and data acquisition 20 is connected to the motor/gearbox 13 in the mechanical compression loading system via the load control line 26, the strain gauge is adhered to the position of the hose where strain needs to be measured, and the control and data acquisition unit 20 is connected with the strain gauge through the strain measurement line 23. The control system is mainly used for starting equipment, controlling and recording the temperature of a medium, controlling and recording pressure, measuring and recording strain, controlling mechanical pressurization load and monitoring the pressure and temperature states of a pipe. During strain measurement, the hoop measurement is performed at every 45-degree point, the hoop measurement is performed at 8 measurement points, the three hoop measurement points of the test piece are respectively located at the center of the test piece, the left side of the left supporting device and the right side of the right supporting device are determined according to test requirements, and the specific positions are determined according to the test requirements. The control system provides a control system for automatic operation and recording and a friendly man-machine interface.
The video monitoring system can record videos to the testing process, and comprises two cameras 24 and a video monitoring circuit 25, wherein the two cameras 24 are arranged on the hose testing site, the cameras 24 are connected with the control and data acquisition 20 of the control system through the video monitoring circuit 25, and the requirements of recording and recording the whole testing process can be provided according to the experiment requirements.
In the mechanical pressure load bending fatigue test, as shown in fig. 1, the inside of the hose is filled with a medium, the hose body is fixed by an end movable clamp 3 and a center fixed clamp 2, and a pressure medium circulation line 8 is connected to the end joint of the hose. The temperature and the pressure of the medium in the hose are kept at set values through a pressurizing and circulating pressurizing system and a medium heating and heat circulating system, and experimental parameters such as the temperature of the medium, the internal pressure of a test piece, the loading frequency, the bending amplitude, the circulating times of mechanical pressurizing load and the like are set in a control system. After the control system is started, the motor/reduction gearbox 13 is started at the same time, the motor/reduction gearbox 13 loads a certain cyclic mechanical load on the test piece through the swinging of the fixed arm 9, the long arm 10, the swinging arm 11 and the small arm 12, so that the test piece is in a bending and straightening state in a cyclic reciprocating mode, the control system can record the temperature of a medium, the internal pressure of the test piece, the strain capacity, the state of the booster pump, the state of the hose, the state of the motor and the working state of the camera 24 in the process, and when one of the conditions is abnormal, the control system can timely adjust or terminate the experiment. During the experiment, camera 24 may record the entire experiment, stop the operation of the device at the end of the experiment, and copy the experimental data and the experimental procedure at control and data acquisition 20. The fatigue condition of the flexible hose caused by the mechanical pressurization load is judged by comparing the changes of the physical property, the chemical property and the mechanical property of the hose before and after the experiment.
In the cyclic internal pressure loading fatigue test, as shown in fig. 2, the hose is inserted into a fixed mold 4 having a certain angle, and the hose joints 5 at both ends of the hose and the fixed mold 4 are fixed to the end movable clamp 3 (at this time, the end movable clamp 3 should be fixed to the fixed base 1) and the center fixed end clamp 2, respectively. The temperature of the medium in the flexible hose is kept through the medium heating and heat circulating system, the periodic circulation of the pressure is realized through the pressurizing and circulating pressurizing system, and experimental parameters such as circulating pressure, the circulating period of the pressurizing pump 17, the temperature of the test piece, the loading times of the circulating internal pressure and the like are set in the control system. After the system is started, a medium is pumped into the test piece through the pressurizing pump 17 and continuously circulates, after the circulating internal pressure circulates to a set number of times, the equipment stops running, the temperature, the pressure and the strain of the circulating internal pressure load of the test piece are recorded, meanwhile, the simulation process can be monitored through the video monitoring system in the experiment process, and finally, experiment data and the experiment process are copied. The fatigue condition of the flexible hose caused by cyclic internal pressure loading is judged by comparing the changes of physical properties, chemical properties and mechanical properties of the hose before and after the experiment.
The experimental device can simulate the fatigue test of the oil delivery hoses with different diameters by replacing the clamps at the two ends of the hose, and the service life of the hose can be estimated through the periodic loading times. The experimental device is suitable for fatigue tests of flexible hoses bent due to mechanical pressurization loads and fatigue tests caused by cyclic internal pressure pressurization loads.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (10)
1. An experimental device for simulating bending fatigue of a marine flexible hose, the experimental device comprising:
the end part movable clamps (3), the end part movable clamps (3) are clamped on the two end parts of the hose;
a mechanical pressure loading system capable of loading the middle of the hose;
a pressurization and circulation pressurization system which pressurizes and conveys a medium of a set temperature into the hose and is capable of circulating the pressurized medium in the hose;
the medium heating and heat circulating system heats the medium conveyed into the hose to a set temperature and keeps the medium temperature to the set temperature; and the number of the first and second groups,
the control system is connected with the pressurization and circulation pressurization system to control and record the pressure applied to the medium by the pressurization and circulation pressurization system and monitor the pressure state of the hose, the control system is connected with the medium heating and heat circulation system to control and record the temperature set by the medium heating and heat circulation system for the medium and monitor the temperature state of the hose, and the control system can measure and record the strain of the hose at each part during the test.
2. The experimental device for simulating the bending fatigue of the marine flexible hose as claimed in claim 1, wherein the experimental device further comprises a fixed die (4), the fixed die (4) is bent to a set angle, and the hose is inserted into the fixed die (4) in a cyclic internal pressure loading test of the hose, so that the hose can be bent to the set angle.
3. The experimental device for simulating the bending fatigue of the marine flexible hose according to the claim 1, wherein the end part movable clamp (3) is of an annular structure and is clamped at the end part of the hose; the end part movable clamp (3) is connected to the fixed base (1) and is in rotating connection with the fixed base (1), so that the end part movable clamp (3) can follow up the bending of the hose and adjust the angle automatically to match the movement of the hose, and the end part movable clamp (3) is in clearance connection with the hose, so that the hose is allowed to slide in the end part movable clamp (3) in the test process to compensate the displacement generated by the bending of the hose.
4. The experimental device for simulating the bending fatigue of the marine flexible hose according to claim 3, wherein hose joints (5) are arranged at two ends of the hose, and the movable end clamps (3) are clamped on the hose joints (5).
5. The experimental device for simulating the bending fatigue of the marine flexible hose according to claim 1, further comprising a central fixed end clamp (2), wherein the central fixed end clamp (2) is clamped in the middle of the hose, and the mechanical pressurization loading system is connected with the central fixed end clamp (2).
6. The experimental device for simulating bending fatigue of a marine flexible hose according to claim 5, wherein the mechanical pressurization loading system comprises:
the motor/reduction gearbox (13), the motor/reduction gearbox (13) is connected with the control system;
a fixed arm (9);
the first end of the long arm (10) is rotatably connected to the fixed arm (9);
the first end of the small arm (12) is rotatably connected with the second end of the long arm (10), and the second end of the small arm (12) is fixedly connected to an output shaft of the motor/reduction gearbox (13); and the number of the first and second groups,
a swing arm (11), wherein a first end of the swing arm (11) is rotatably connected to the long arm (10), and a second end of the swing arm (11) is fixedly connected to the central fixed end clamp (2);
the motor/reduction gearbox (13) drives the small arm (12) to rotate forwards and backwards so as to drive the long arm (10) to swing up and down, so that the swinging arm (11) drives the center of the hose to move up and down, and the bending fatigue test of the hose is simulated.
7. The experimental device for simulating bending fatigue of a marine flexible hose according to claim 1, wherein the pressurization and circulation pressurization system comprises:
a pressure pump (17);
a pressurized medium inlet (6) and a pressurized circulating medium outlet (7), wherein the pressurized medium inlet (6) and the pressurized circulating medium outlet (7) are respectively arranged at two ends of the hose, and the pressurized medium inlet (6) is connected with an outlet of the pressurizing pump (17) through a pipeline;
a pressurized medium circulation line (8), the pressurized circulation medium outlet (7) is connected with a heating container (14) of the medium heating and heat circulation system through the pressurized medium circulation line (8); and the number of the first and second groups,
a pressure sensor (19), the pressure sensor (19) being arranged at the end of the pressurized circulating medium outlet (7);
wherein the pressure pump (17) and the pressure sensor (19) are both connected to the control system.
8. The experimental device for simulating bending fatigue of marine flexible hose according to claim 7, wherein the medium heating and heat circulating system comprises:
a heating container (14) in which the medium is stored, the heating container (14) being connected to an inlet of the pressurizing pump (17);
a first temperature sensor (15), said first temperature sensor (15) being disposed within said heating vessel (14);
an electric heater (16), the electric heater (16) being disposed within the heating vessel (14); and the number of the first and second groups,
a second temperature sensor (18), said second temperature sensor (18) being arranged at the end of the pressurized circulating medium outlet (7);
wherein the first temperature sensor (15), the electric heater (16) and the second temperature sensor (18) are all connected with the control system.
9. The experimental device for simulating bending fatigue of a marine flexible hose according to claim 1, wherein the control system comprises:
control and data acquisition (20);
the automatic temperature control circuit (21) is used for connecting the control and data acquisition (20) with a first temperature sensor (15) and an electric heater (16) in the medium heating and heat circulating system through the automatic temperature control circuit (21);
an automatic pressurization control line (22), through which the control and data acquisition (20) is connected to a pressurization pump (17) in the pressurization and circulation pressurization system;
the loading control line (26), the control and data acquisition (20) is connected with a motor/reduction gearbox (13) in the mechanical pressurization load system through the loading control line (26);
a pipe condition monitoring line (27), through which the control and data acquisition (20) is connected to a pressure sensor (19) of the pressurization and circulation pressurization system and to a second temperature sensor (18) of the medium heating and heat circulation system; and the number of the first and second groups,
the flexible pipe strain gauge comprises a strain gauge and a strain measurement line (23), wherein the strain gauge is pasted on a position where the strain of the flexible pipe needs to be measured, and the control and data acquisition (20) is connected with the strain gauge through the strain measurement line (23).
10. The experimental device for simulating the bending fatigue of the marine flexible hose according to claim 1, further comprising a video monitoring system capable of recording a test process, wherein the video monitoring system comprises a camera (24) and a video monitoring line (25), the camera (24) is arranged at the hose test site, and the camera (24) is connected with the control system through the video monitoring line (25).
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| CN202110383006.1A CN113029814A (en) | 2021-04-09 | 2021-04-09 | Experimental device for simulating bending fatigue of marine flexible hose |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114414383A (en) * | 2021-12-24 | 2022-04-29 | 大连理工大学 | Comprehensive experiment testing device of flexible pipeline low-temperature circulating system |
| CN116973242A (en) * | 2023-09-22 | 2023-10-31 | 江苏华恬节能科技有限公司 | Polyurethane product high-temperature illumination deformation detection equipment and detection method thereof |
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2021
- 2021-04-09 CN CN202110383006.1A patent/CN113029814A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114414383A (en) * | 2021-12-24 | 2022-04-29 | 大连理工大学 | Comprehensive experiment testing device of flexible pipeline low-temperature circulating system |
| CN114414383B (en) * | 2021-12-24 | 2023-10-03 | 大连理工大学 | Comprehensive experiment testing device of flexible pipeline low-temperature circulating system |
| CN116973242A (en) * | 2023-09-22 | 2023-10-31 | 江苏华恬节能科技有限公司 | Polyurethane product high-temperature illumination deformation detection equipment and detection method thereof |
| CN116973242B (en) * | 2023-09-22 | 2023-11-28 | 江苏华恬节能科技有限公司 | Polyurethane product high-temperature illumination deformation detection equipment and detection method thereof |
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