CN113984561A - Flexible joint test tool and test method thereof - Google Patents
Flexible joint test tool and test method thereof Download PDFInfo
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- CN113984561A CN113984561A CN202111376274.7A CN202111376274A CN113984561A CN 113984561 A CN113984561 A CN 113984561A CN 202111376274 A CN202111376274 A CN 202111376274A CN 113984561 A CN113984561 A CN 113984561A
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- 238000012360 testing method Methods 0.000 title claims abstract description 40
- 238000010998 test method Methods 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 47
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 230000007246 mechanism Effects 0.000 claims abstract description 16
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 230000003068 static effect Effects 0.000 claims description 11
- 238000009661 fatigue test Methods 0.000 claims description 10
- 238000013461 design Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims 2
- 230000001276 controlling effect Effects 0.000 claims 1
- 229920001971 elastomer Polymers 0.000 abstract description 10
- 239000000806 elastomer Substances 0.000 abstract description 10
- 238000004088 simulation Methods 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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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
- G01N3/02—Details
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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
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
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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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- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
- G01N2203/0232—High pressure
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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
- G01N2203/02—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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- 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
- G01N2203/02—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 relates to a flexible joint for an oil extraction platform, in particular to a flexible joint test tool and a test method thereof, wherein the flexible joint is arranged in a fixed outer sleeve, a rotating shaft is arranged on the fixed outer sleeve, and the rotating shaft is rotationally connected with a rack; the lower end of the flexible joint extends out of the rack to form a flexible joint extending section, an oil cylinder connecting plate is mounted on the flexible joint extending section, and a vertical oil cylinder is connected between the oil cylinder connecting plate and the bottom of the rack; the torque input balance wheel is arranged on the rotating shaft and is connected with a torque input power source through a transmission mechanism; the top of flexible joint main part and closing cap sealing connection, liquid circulation equipment advances the pipe and the circulating liquid exit tube links to each other with the closing cap through circulating liquid to with the inside intercommunication of flexible joint. The invention realizes the deflection test of the flexible joint under the axial load, and simultaneously, the elastomer is placed in a high-temperature and high-pressure liquid environment, thereby realizing the complete simulation of the working environment.
Description
Technical Field
The invention relates to a flexible joint for an oil extraction platform, in particular to a flexible joint test tool and a test method thereof.
Background
Deep water oil and gas exploration and production are the general trend of the development of the world ocean oil and gas industry, the south China sea deep water area has rich oil and gas resources, and ocean platforms and riser systems are rapidly developed along with the increasing of the mining water depth. For deep water production systems, riser systems, which are used as conduits for connecting surface floating devices and subsea equipment, are the "throat-main" for the transport of various media, and play a very important role. One of the important components of a riser system, the flexible joint, is often the most critical component that can cause damage to the system and failure. As shown in FIG. 1, flexible joint 27 suspends SCR riser 29 (steel catenary riser) from the side of offshore platform 28, with one end of SCR riser 29 extending from sea level 25 and connected to flexible joint 27, and the other end of SCR riser 29 located at subsea mud level 26; the flexible joint 27 suspending the SCR riser 29 (steel catenary riser) from the side of the offshore platform 28 provides the following distinct advantages: significantly reducing the kinematic stresses between the floating platform and the risers; can be used for transmission of various media; the connecting device is designed according to specific application requirements, can adapt to different connecting modes, can provide a +/-20-degree rotating angle, and can bear the operating pressure of more than 50MPa and huge axial tension.
The floating platform is often in large motion response under the action of wind, waves, ocean currents and the like. The flexible joint is located at the top of the riser and will bear large axial loads, corners, and high temperature, pressure and corrosion of the internal transmission medium, while the fatigue properties of the elastomer are also important considerations. Therefore, a simulation test and a fatigue test are required to be designed for the flexible joint according to the working condition.
The most important test item of the flexible joint elastomer is a deflection test under the working condition of axial preload, the diameter of the elastomer is about 1000mm, the axial preload is about 5000kN, the moment of deflection at 3 degrees is 106 kN.m, the elastomer with large volume, large axial load and large deflection moment is subjected to the combined loading test of axial deflection, and meanwhile, the pressure and the high temperature of the inner cavity of the joint are considered, and the existing test equipment cannot realize the test. Therefore, it is necessary to design a combined test device capable of simultaneously applying large load axial tension and large moment deflection, and the test device also meets the requirement of fatigue test.
Disclosure of Invention
In order to meet the test requirement of the flexible joint, the invention aims to provide a flexible joint test tool and a test method thereof.
The purpose of the invention is realized by the following technical scheme:
the testing tool comprises liquid circulation equipment, a torque input power source, a transmission mechanism, a rack, a vertical oil cylinder, a fixed outer sleeve, a sealing cover and an oil cylinder connecting plate, wherein a flexible joint to be tested is arranged in the fixed outer sleeve, a rotating shaft is arranged on the fixed outer sleeve, and the rotating shaft is rotatably connected with the rack; the lower end of a flexible joint to be tested extends out of the rack to form a flexible joint extending section, an oil cylinder connecting plate is mounted on the flexible joint extending section, a vertical oil cylinder which applies axial load to the flexible joint extending section is connected between the oil cylinder connecting plate and the bottom of the rack, a displacement sensor is mounted at the bottom of the rack, and a tension sensor is mounted on the flexible joint extending section; the torque input balance wheel is connected with a torque input power source through a transmission mechanism, the torque input balance wheel is driven by the torque input power source through the transmission mechanism to swing, the fixed outer sleeve and the flexible joint are driven by the rotating shaft to swing, a counter is mounted on the torque input balance wheel, and an inclination angle sensor is mounted on a flexible joint main body of the flexible joint above the fixed outer sleeve; the top of the flexible joint main body is connected with the sealing cover in a sealing mode, and the liquid circulation equipment is connected with the sealing cover through a circulating liquid inlet pipe and a circulating liquid outlet pipe and is communicated with the interior of the flexible joint.
Wherein: the fixed outer sleeve is in a hollow cylindrical shape and is divided into two parts with the same structure, the horizontal projection of each part is in a semicircular shape, the outer surface of each part is provided with a rotating shaft, the rotating shaft is rotatably connected with the rack through a bearing, the two parts are connected through outer sleeve fastening bolts, and the flexible joint is clamped in the fixed outer sleeve.
The axial center lines of the two rotating shafts on the fixed outer sleeve are collinear and are parallel to the horizontal plane, and the deflection center of the flexible joint is vertically intersected with the axial center lines of the two rotating shafts.
The frame includes bottom plate and two risers, two the riser symmetry is located the both sides of bottom plate, and with the bottom plate is mutually perpendicular, every all pass through on the riser a pivot is connected in the bearing rotation.
The torque input power source is a gearbox, the transmission mechanism is a connecting rod, one end of the connecting rod is connected with the torque input balance wheel, and the other end of the connecting rod is eccentrically connected with an output wheel of the gearbox.
The rotating shaft is provided with two limiting blocks which are symmetrically arranged on the left side and the right side of the vertical section of the torque input balance wheel.
And an extension section plug is arranged in the extension section of the flexible joint.
The test method of the flexible joint test tool comprises a static test method and a fatigue test method, wherein the static test method and the fatigue test method are adopted
The static test method comprises the following steps:
A. assembling the flexible joint to be tested;
B. fixing the fixing outer sleeve on the flexible joint;
C. rotatably mounting the fixed outer sleeve and the flexible joint on a rack;
D. the torque input balance wheel and the torque sensor are respectively arranged on the rotating shaft, and the torque input balance wheel is connected with a torque input power source through a transmission mechanism;
E. connecting the extending section of the flexible joint with a vertical oil cylinder;
F. connecting the sealing cover with liquid circulation equipment through a circulating liquid inlet pipe and a circulating liquid outlet pipe, wherein the sealing cover is connected with the top of the flexible joint main body of the flexible joint;
G. an inclination angle sensor is installed on the flexible joint main body, a displacement sensor is installed at the bottom of the rack, and a tension sensor is installed at the extending section of the flexible joint;
H. starting the liquid circulation equipment, injecting medium liquid with the adjusted temperature into an inner cavity of the flexible joint, and adjusting the outlet pressure of a pump station in the liquid circulation equipment to a design value after the temperature of the liquid in the inner cavity is constant;
I. applying an axial load to the flexible joint elastomer through the vertical oil cylinder and the flexible joint extending section, and recording the numerical value of the displacement sensor;
J. starting the torque input power source, applying torque to the fixed outer sleeve and the flexible joint through the torque input balance wheel according to design requirements, and respectively recording numerical values of the inclination angle sensor, the torque sensor, the displacement sensor and the tension sensor;
the fatigue test method comprises the following steps:
K. mounting according to the steps A to H of the static test method;
l, applying axial load according to various working conditions by the method of the step I;
controlling a torque input power source to apply a circulating torque through electro-hydraulic servo equipment;
and N, recording the cycle number through a counter.
Wherein: in the step B, an adjusting gasket is placed between the shell of the flexible joint and the bottom of the fixed outer sleeve to adjust the gap between the flexible joint and the bottom of the fixed outer sleeve, so that the deflection center of the flexible joint is perpendicularly intersected with the axial center line of the rotating shaft.
And D, additionally arranging a limiting block on the rotating shaft.
The invention has the advantages and positive effects that:
1. the invention realizes the deflection test of the flexible joint under the axial load, and simultaneously, the elastomer is placed in the high-temperature and high-pressure liquid environment, thereby realizing the complete simulation of the working environment and solving the problems that the existing test equipment can only carry out a single tensile or deflection test and can not carry out a combined test; meanwhile, high-temperature circulating liquid is added for the flexible joint test, and the problem that the elastomer material cannot completely simulate the actual high-temperature working condition in the normal-temperature test is solved.
2. The invention directly inputs torque through a rotating shaft for torque input, in the prior art, an oil cylinder applies force, and the offset distance between the oil cylinder and the rotating center of the flexible joint is used as a force arm, so that the error of indirect input torque comprises the following steps: the oil cylinder applies force error and offset distance error, and the deviation of the measuring result is large. The invention directly inputs the torque, greatly reduces the error and outputs a test result more accurately.
3. The flexible joint extending section is relatively fixed with the rotation center of the flexible joint main body, and no extra force is generated on the flexible joint extending section due to deflection of the flexible joint main body.
Drawings
FIG. 1 is a schematic structural view of an applied state of a flexible joint;
FIG. 2 is a front view of the test fixture of the present invention;
FIG. 3 is a right side cross-sectional view of the test fixture of the present invention;
FIG. 4 is a top view of the test fixture of the present invention;
wherein: the device comprises a liquid circulation device 1, a torque input balance wheel 2, a gearbox 3, a connecting rod 4, a rack 5, a vertical oil cylinder 6, a flexible joint extending section 7, a jacket fastening bolt 8, a fixed jacket 9, a counter 10, a flexible joint main body 11, an inclination angle sensor 12, a seal cover 13, a bearing 14, a torque sensor 15, an oil cylinder connecting plate 16, an extending section plug 17, a flexible joint elastomer 18, a flexible joint shell 19, a flexible joint flange 20, a circulating liquid inlet pipe 21, a displacement sensor 22, a limiting block 23, a circulating liquid outlet pipe 24, a sea level 25, a seabed mud level 26, a flexible joint 27, an offshore platform 28, an SCR (selective catalytic reduction) stand pipe 29 and a rotating shaft 30.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 2 to 4, the test tool of the invention comprises a liquid circulation device 1, a torque input power source, a transmission mechanism, a frame 5, a vertical oil cylinder 6, a fixed outer sleeve 9, a seal cover 13 and an oil cylinder connecting plate 16, wherein a flexible joint to be tested is arranged in the fixed outer sleeve 9, a rotating shaft 30 is arranged on the fixed outer sleeve 9, and the rotating shaft 30 is rotatably connected with the frame 5; the lower end of a flexible joint to be tested extends out of a rack 5 to form a flexible joint extending section 7, an extending section plug 17 is arranged in the flexible joint extending section 7, an oil cylinder connecting plate 16 is arranged on the flexible joint extending section 7, a vertical oil cylinder 6 for applying axial load to the flexible joint extending section 7 is connected between the oil cylinder connecting plate 16 and the bottom of the rack 5, a cylinder body or a piston of the vertical oil cylinder 6 is fixedly connected onto the rack 5, a piston or a cylinder body of the vertical oil cylinder 6 is fixedly connected with the oil cylinder connecting plate 16, a displacement sensor 22 is arranged at the bottom of the rack 5 and used for observing the axial displacement of the flexible joint, and a tension sensor is arranged on the flexible joint extending section 7 and used for measuring and controlling the applied axial tensile load; the moment input balance wheel 2 and the moment sensor 15 are respectively arranged on the rotating shaft 30, the moment sensor 15 is used for measuring the moment deflected by the flexible joint elastic body 18, the moment input balance wheel 2 is connected with a moment input power source through a transmission mechanism, the moment input power source drives the moment input balance wheel 2 to swing through the transmission mechanism, the rotating shaft 30 further drives the fixed outer sleeve 9 and the flexible joint to swing, the moment input balance wheel 2 is provided with a counter 10, and the flexible joint body 11 positioned above the fixed outer sleeve 9 is provided with an inclination angle sensor 12 for measuring the deflection angle of the flexible joint body 11 under the action of the moment; the top of the flexible joint body 11 is hermetically connected with the sealing cover 13, and the liquid circulation device 1 is connected with the sealing cover 13 through a circulation liquid inlet pipe 21 and a circulation liquid outlet pipe 24 and is communicated with the interior of the flexible joint.
The fixed overcoat 9 of this embodiment is hollow cylinder, divide into two parts that the structure is the same, and every partial horizontal projection is semicircle form, and every partial surface all is equipped with a pivot 30, and pivot 30 passes through bearing 14 and is connected with frame 5 rotation, links to each other through overcoat fastening bolt 8 between two parts, presss from both sides the flexible joint in the inside of fixed overcoat 9. The frame 5 of this embodiment includes bottom plate and two risers, and two riser symmetry lie in the both sides of bottom plate, and perpendicular mutually with the bottom plate, all rotate a pivot 30 of connection through bearing 14 on every riser. The axial center lines of the two rotating shafts 30 on the fixed outer sleeve 9 are collinear and are parallel to the horizontal plane, and the deflection center of the flexible joint is vertically intersected with the axial center lines of the two rotating shafts 30.
The torque input power source of the embodiment is a gearbox 3, the transmission mechanism is a connecting rod 4, one end of the connecting rod 4 is connected with the torque input balance wheel 2, and the other end of the connecting rod 4 is eccentrically connected with an output wheel of the gearbox 3. The gearbox 3 of the present embodiment may be replaced by a cylinder, the piston of which extends and retracts to drive the connecting rod 4. The moment input balance 2 of the present embodiment may be replaced by a gear or a sprocket.
The torque sensor 15 of the present embodiment is arranged between the torque input balance 2 and the bearing 14, reducing the deviation introduced due to frictional resistance.
The two limit blocks 23 are symmetrically arranged on the left side and the right side of the vertical section of the torque input balance wheel 2, and are used for controlling the torsion angle of the flexible joint and preventing the elastic body of the flexible joint from being excessively twisted as a safety device.
The liquid circulation device 1 of the present embodiment is the prior art, has the functions of heating and pressurizing, is equipped with a pressure sensor and a temperature sensor, and can simulate a high-temperature (70 ℃) and high-pressure (57MPa) transmission medium, so as to ensure that the pressure and the temperature of the liquid (i.e. the transmission medium) entering the inner cavity of the flexible joint are stable.
The gearbox 3 of the embodiment is connected with an electro-hydraulic servo device, the electro-hydraulic servo device is used for controlling the input magnitude and frequency of the torque and is matched with a counter 10 to perform a fatigue characteristic test; the counter is used for the fatigue characteristic test of flexible joint, cooperates the electric liquid servo equipment, records the number of times of fatigue circulation.
The test method of the flexible joint test tool comprises a static test method and a fatigue test method, wherein the static test method comprises the following steps:
the static test method comprises the following steps:
A. assembling the flexible joint to be tested; the flexible joint flange 20 and the flexible joint shell 19 are fixedly connected through bolts to form a flexible joint main body 11, the upper end of the hemispherical pipe is positioned in the flexible joint shell 19, a flexible joint elastic body 18 is arranged between the upper end of the hemispherical pipe and the inner wall of the flexible joint shell 19, and the lower end of the hemispherical pipe is the flexible joint extending section 7;
B. fixing the fixed outer sleeve 9 on the flexible joint, and placing an adjusting gasket between the flexible joint shell 19 and the bottom of the fixed outer sleeve 9 to adjust the gap between the flexible joint and the bottom of the fixed outer sleeve 9, so that the deflection center of the flexible joint is vertically intersected with the axial center line of the rotating shaft 10;
C. the fixed outer sleeve 9 and the flexible joint are rotatably arranged on the frame 5;
D. the moment input balance wheel 2, the moment sensor 15 and the limiting block 23 are respectively arranged on the rotating shaft 5, and the moment input balance wheel 2 is connected with a moment input power source (namely the gearbox 3) through a transmission mechanism (namely the connecting rod 4);
E. connecting the flexible joint extending section 7 with the vertical oil cylinder 6;
F. connecting a sealing cover 13 with the liquid circulation equipment 1 through a circulating liquid inlet pipe 21 and a circulating liquid outlet pipe 24, wherein the sealing cover 13 is connected with the top of the flexible joint main body 11 of the flexible joint;
G. an inclination angle sensor is arranged on the flexible joint main body 11, a displacement sensor 22 is arranged at the bottom of the frame 5, and a tension sensor is arranged at the extension section 7 of the flexible joint;
H. starting the liquid circulation equipment 1, injecting medium liquid with the adjusted temperature into an inner cavity of the flexible joint, and adjusting the outlet pressure of a pump station in the liquid circulation equipment 1 to a design value after the temperature of the liquid in the inner cavity is constant;
I. applying an axial load to the flexible joint elastomer 18 through the vertical oil cylinder 6 and the flexible joint extension section 7, and recording the numerical value of the displacement sensor 22;
J. starting a torque input power source, applying torque to the fixed outer sleeve 9 and the flexible joint through the torque input balance wheel 2 according to design requirements, and respectively recording numerical values of the inclination angle sensor 12, the torque sensor 15, the displacement sensor 22 and the tension sensor;
the fatigue test method comprises the following steps:
K. mounting according to the steps A to H of the static test method;
l, applying axial load according to various working conditions by the method of the step I;
controlling a torque input power source to apply a circulating torque through electro-hydraulic servo equipment;
n. the number of cycles is recorded by a counter 10.
By adopting the method, the deflection angle-moment measurement of the flexible joint is realized under the working condition of bearing axial load in a high-temperature and high-pressure liquid environment, and a deflection stiffness curve is drawn according to the deflection angle-moment measurement.
The invention can simulate the actual working condition more truly, the extending section 7 of the flexible joint is connected with the vertical oil cylinder 6, and the axial load is applied to the extending section 7 of the flexible joint through the vertical oil cylinder 6. The flexible joint shell 19 is locked by the fixed outer sleeve 9, the fixed outer sleeve 9 is installed on the rack 5 through the rotating shaft 30, then a torque input power source applies torque to the flexible joint main body 11 through the torque sensor 15, the inclination angle sensor 12 is used for measuring the angle change of the flexible joint main body 11, and therefore a torque-angle curve is obtained, and further a torsional rigidity curve is obtained. The environment of the flexible joint under working conditions is simulated by injecting circulating high-temperature and high-pressure liquid into the flexible joint. The fatigue test of the flexible joint is realized by controlling the input direction of the torque input end and the change frequency of the torque.
Claims (10)
1. The utility model provides a flexible joint test frock which characterized in that: the test device comprises a liquid circulation device (1), a torque input power source, a transmission mechanism, a rack (5), a vertical oil cylinder (6), a fixed outer sleeve (9), a sealing cover (13) and an oil cylinder connecting plate (16), wherein a flexible joint to be tested is arranged in the fixed outer sleeve (9), a rotating shaft (30) is arranged on the fixed outer sleeve (9), and the rotating shaft (30) is rotatably connected with the rack (5); the lower end of a flexible joint to be tested extends out of the rack (5) to form a flexible joint extending section (7), an oil cylinder connecting plate (16) is mounted on the flexible joint extending section (7), a vertical oil cylinder (6) which applies axial load to the flexible joint extending section (7) is connected between the oil cylinder connecting plate (16) and the bottom of the rack (5), a displacement sensor (22) is mounted at the bottom of the rack (5), and a tension sensor is mounted on the flexible joint extending section (7); the moment input balance wheel (2) and the moment sensor (15) are respectively installed on the rotating shaft (30), the moment input balance wheel (2) is connected with a moment input power source through a transmission mechanism, the moment input power source drives the moment input balance wheel (2) to swing through the transmission mechanism, the rotating shaft (30) drives the fixed outer sleeve (9) and the flexible joint to swing, a counter (10) is installed on the moment input balance wheel (2), and an inclination angle sensor (12) is installed on a flexible joint main body (11) of the flexible joint, which is located above the fixed outer sleeve (9); the top of the flexible joint main body (11) is connected with the sealing cover (13) in a sealing mode, and the liquid circulation equipment (1) is connected with the sealing cover (13) through a circulating liquid inlet pipe (21) and a circulating liquid outlet pipe (24) and is communicated with the interior of the flexible joint.
2. The flexible joint test tool of claim 1, wherein: fixed overcoat (9) are hollow cylinder, divide into the same two parts of structure, and the horizontal projection of every part is semicircle form, and the surface of every part all is equipped with a pivot (30), pivot (30) are passed through bearing (14) and are rotated with frame (5) and are connected, link to each other through overcoat fastening bolt (8) between the two parts, will flexible joint presss from both sides tightly in the inside of fixed overcoat (9).
3. The flexible joint test tool of claim 2, wherein: the axial center lines of the two rotating shafts (30) on the fixed outer sleeve (9) are collinear and are parallel to a horizontal plane, and the deflection center of the flexible joint is vertically intersected with the axial center lines of the two rotating shafts (30).
4. The flexible joint test tool of claim 2, wherein: frame (5) include bottom plate and two risers, two the riser symmetry is located the both sides of bottom plate, and with the bottom plate is mutually perpendicular, every all pass through on the riser bearing (14) rotate and connect a pivot (30).
5. The flexible joint test tool of claim 1, wherein: the torque input power source is a gearbox (3), the transmission mechanism is a connecting rod (4), one end of the connecting rod (4) is connected with the torque input balance wheel (2), and the other end of the connecting rod is eccentrically connected with an output wheel of the gearbox (3).
6. The flexible joint test tool of claim 1, wherein: the rotating shaft (30) is provided with two limiting blocks (23), and the two limiting blocks (23) are symmetrically arranged on the left side and the right side of the vertical section of the torque input balance wheel (2).
7. The flexible joint test tool of claim 1, wherein: an extension section plug (17) is arranged in the flexible joint extension section (7).
8. A test method of the flexible joint test tool of any one of claims 1 to 7 is characterized in that: comprising a static test method and a fatigue test method, wherein
The static test method comprises the following steps:
A. assembling the flexible joint to be tested;
B. fixing the fixing outer sleeve (9) on the flexible joint;
C. the fixed outer sleeve (9) and the flexible joint are rotatably arranged on the rack (5);
D. a moment input balance wheel (2) and a moment sensor (15) are respectively arranged on the rotating shaft (5), and the moment input balance wheel (2) is connected with a moment input power source through a transmission mechanism;
E. connecting the flexible joint extending section (7) with a vertical oil cylinder (6);
F. the sealing cover (13) is connected with the liquid circulation equipment (1) through a circulating liquid inlet pipe (21) and a circulating liquid outlet pipe (24), and the sealing cover (13) is connected with the top of the flexible joint main body (11) of the flexible joint;
G. an inclination angle sensor is installed on the flexible joint main body (11), a displacement sensor (22) is installed at the bottom of the rack (5), and a tension sensor is installed on the flexible joint extending section (7);
H. starting the liquid circulation equipment (1), injecting medium liquid with the regulated temperature into an inner cavity of the flexible joint, and regulating the outlet pressure of a pump station in the liquid circulation equipment (1) to a designed value after the temperature of the liquid in the inner cavity is constant;
I. applying axial load to the flexible joint elastic body (18) through the vertical oil cylinder (6) and the flexible joint extending section (7), and recording the numerical value of the displacement sensor (22);
J. starting the torque input power source, applying torque to the fixed outer sleeve (9) and the flexible joint through the torque input balance wheel (2) according to design requirements, and respectively recording numerical values of the inclination angle sensor (12), the torque sensor (15), the displacement sensor (22) and the tension sensor;
the fatigue test method comprises the following steps:
K. mounting according to the steps A to H of the static test method;
l, applying axial load according to various working conditions by the method of the step I;
controlling a torque input power source to apply a circulating torque through electro-hydraulic servo equipment;
n. recording the number of cycles by means of a counter (10).
9. Test method according to claim 8, characterized in that: in the step B, an adjusting gasket is placed between the flexible joint shell (19) and the bottom of the fixed outer sleeve (9) to adjust the gap between the flexible joint and the bottom of the fixed outer sleeve (9), so that the deflection center of the flexible joint is perpendicularly intersected with the axial center line of the rotating shaft (10).
10. Test method according to claim 8, characterized in that: and in the step D, a limiting block (23) is additionally arranged on the rotating shaft (30) at the same time.
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| CN115371869A (en) * | 2022-08-22 | 2022-11-22 | 南京航空航天大学 | Spherical joint starting torque measuring device and method based on gravity balancing |
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