CN112033821A

CN112033821A - Pipeline fatigue test device

Info

Publication number: CN112033821A
Application number: CN202010875209.8A
Authority: CN
Inventors: 牛虎理; 张田利; 唐德渝; 刘剑; 何亚章; 张建护; 杨华庆; 李春润
Original assignee: China National Petroleum Corp; CNPC Engineering Technology R&D Co Ltd; CNPC Offshore Engineering Co Ltd
Current assignee: China National Petroleum Corp; CNPC Engineering Technology R&D Co Ltd; CNPC Offshore Engineering Co Ltd
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2020-12-04

Abstract

The invention relates to a pipeline fatigue test device. The device includes power component, vibration loading subassembly and supporting component, rotary motion can be done to power component's output, vibration loading subassembly's vibration axle rotationally sets up on the base, the vibration axle has relative first end and second end, the first end of vibration axle and power component's output are connected, the polarization chunk sets up and serves at the second of vibration axle, polarization chunk and vibration axle off-centre set, the bucket rotationally the suit is epaxial at the vibration to the biography, the global outside at the bucket is shaken in the biography to the one end fixed connection of pipe appearance connecting sleeve, the other end of pipe appearance connecting sleeve is used for supporting the one end of connecting the pipeline of treating the experiment, supporting component is used for supporting the other end of treating the pipeline of experimenting. The invention can obtain more comprehensive and reliable fatigue test data of the full-size pipeline and the welding joint thereof, which are more in line with the actual working condition, accurately master the whole fatigue performance of the pipeline, and improve the accuracy of safety check and fatigue life evaluation of the pipeline.

Description

Pipeline fatigue test device

Technical Field

The invention belongs to the technical field of engineering material and structural performance tests, and particularly relates to a pipeline fatigue test device.

Background

The fatigue performance indexes of the pipeline and the welding joint thereof are important indexes for engineering design, construction and safety evaluation of the pipeline, a steel structure and the like, and in order to ensure the safety, reliability and economy of engineering in design, construction and operation, most of the important engineering at home and abroad requires a full-size pipeline fatigue test of the pipeline and the welding joint thereof so as to check the safety of the pipeline and the welding joint thereof, evaluate the fatigue life of the pipeline and the welding joint thereof more truly and reliably, and optimize the design, the welding process and the structure of the pipeline and the welding joint.

At present, the domestic pipeline full-size fatigue testing machine adopts a three-point or four-point bending fatigue working mode that two ends of a pipeline are fixed and the middle part vibrates up and down with small amplitude and low frequency, the device generally comprises a high-rigidity rail horizontal type frame, 2 pipe end fixing support seats at the left side and the right side, an alternating load loader driven by 1 or 2 hydraulic cylinders in the middle and the like, and a hydraulic system, an electric/hydraulic control system, a data acquisition system and the like are configured to form a complete fatigue test and detection system, wherein the fixed support and the alternating load loader are both arranged on the rail horizontal type frame, can move along the rail and can be fixed on the frame, in order to meet different test requirements, the middle 1 or 2 alternating load loaders move up and down periodically to drive the pipeline to bend up and down, so that the alternating load loading required by the fatigue test is realized, and the three-point or four-point bending fatigue of the pipeline is realized.

In carrying out the present invention, the applicant has found that at least the following disadvantages exist in the prior art:

among the prior art, pipeline or welded joint test loaded direction is single, and the atress is uneven in the hoop, and is great with pipeline and welded joint operating condition difference: the loading environment of the pipeline and the welded joint thereof in the actual operation process is complex, for example, when a suspended span section sea pipe is impacted by ocean currents, vortexes and the like, the suspended span section sea pipe can be subjected to continuous periodic alternating load in a plurality of different directions, rather than only cyclic alternating load in a single direction, and when the pipeline is subjected to a fatigue test, the pipeline is only repeatedly bent in the vertical direction, the annular stress of the pipeline is gradually reduced from the top to the middle, namely the stress is maximum at 12-point and 6-point positions and gradually reduced along the clockwise and anticlockwise directions, and the stress is reduced to zero or minimum at 3-point and 9-point positions, so that the final test result cannot comprehensively and specifically represent the overall performance of the pipeline;

disclosure of Invention

Aiming at the defects in the prior art, the invention provides a pipeline fatigue test device, which aims to solve the technical problems that the pipeline or welding joint test in the prior art has a single loading direction, is stressed unevenly in the annular direction and has a large difference with the actual working conditions of the pipeline and the welding joint thereof.

The technical scheme of the invention is as follows:

a pipeline fatigue test device, the device comprising:

the output end of the power assembly can rotate;

the vibration loading assembly comprises a base, a vibration shaft, a vibration transmission barrel, a polarization block and a tube sample connecting sleeve, wherein the vibration shaft is rotatably arranged on the base and is provided with a first end and a second end which are opposite, the first end of the vibration shaft is connected with the output end of the power assembly, the polarization block is arranged at the second end of the vibration shaft, the polarization block and the vibration shaft are eccentrically arranged, the vibration transmission barrel is rotatably sleeved on the vibration shaft, one end of the tube sample connecting sleeve is fixedly connected to the outer side of the peripheral surface of the vibration transmission barrel, and the other end of the tube sample connecting sleeve is used for supporting and connecting one end of a pipeline to be tested;

and the supporting component is used for supporting the other end of the pipeline to be tested.

Further, the power assembly includes:

the rack is arranged on one side of the base;

the motor and the speed reducer are both fixedly arranged on the rack, an output shaft of the motor is connected with an input shaft of the speed reducer, and a first chain wheel is arranged on an output shaft of the speed reducer;

the vertical frame is fixedly arranged on the rack;

the power output shaft is rotatably arranged on the vertical frame, a second chain wheel is arranged at one end of the power output shaft, the diameter of the second chain wheel is larger than that of the first chain wheel, the second chain wheel is in transmission connection with the first chain wheel through a roller chain, the other end of the power output shaft is an output end of the power assembly, and the other end of the power output shaft is connected with the first end of the vibration shaft.

Furthermore, a supporting box body is arranged on the base, and two ends of the vibration shaft respectively and rotatably penetrate through the supporting box body.

Further, the polarization block includes fixed polarization piece and activity polarization piece, fixed polarization piece and activity polarization piece are fan-shaped platelike structure, the fixed suit of fixed polarization piece is in on the second of vibration axle is served, the activity polarization piece can be relative the vibration axle rotates, just, the activity polarization piece operationally with fixed polarization piece is fixed to be set up.

Furthermore, a columnar boss is arranged on the end face of the center of circle position of the fixed polarization block, the second end of the vibration shaft fixedly penetrates through the middle part of the boss, a plurality of first connecting through holes are arranged on the end face of the inner side of the fixed polarization block, the plurality of first connecting through holes are arranged around the central shaft of the vibration shaft at equal angular intervals, a plurality of second connecting through holes are arranged at the edge part of the fixed polarization block, and the plurality of second connecting through holes are arranged around the straight line where the center of circle of the fixed polarization block is located at equal angular intervals;

a connecting through hole is formed in the position of the circle center of the movable polarizing block, a boss on the fixed polarizing block is arranged in the connecting through hole of the movable polarizing block in a clearance fit manner, a plurality of third connecting through holes are formed in the inner side of the movable polarizing block and are arranged at equal angular intervals around the central axis of the vibrating shaft, the third connecting through holes and the first connecting through hole are correspondingly arranged, a plurality of fourth connecting through holes are formed in the edge part of the movable polarizing block and are arranged at equal angular intervals around the straight line where the circle center of the movable polarizing block is located, and the fourth connecting through holes and the second connecting through holes are arranged in a one-to-one correspondence manner;

the relative position of the movable polarization block and the fixed polarization block can be adjusted by selecting the corresponding first connecting through hole and the corresponding third connecting through hole to be matched with the first connecting screw, and the corresponding sixth connecting through hole and the corresponding fourth connecting through hole to be matched with the second connecting screw.

Furthermore, the middle part of the vibration shaft is sleeved with two opposite bearings, the middle parts of the two ends of the vibration transmission barrel are respectively provided with two fifth communication holes, and the two bearings are correspondingly matched and arranged in the two fifth communication holes at the two ends of the vibration transmission barrel.

Furthermore, one end of the circumferential surface of the tube sample connecting sleeve is provided with at least one circle of sixth communication holes, the sixth communication holes are arranged along the radial direction of the tube sample connecting sleeve, a plurality of the sixth communication holes are arranged around the circumferential surface of the tube sample connecting sleeve at equal angular intervals, the sixth communication holes and third connecting screws are arranged in a one-to-one correspondence manner, and the third connecting screws penetrate through the corresponding sixth communication holes and enter the circumferential surface of the vibration transmission barrel.

Furthermore, the other end of the circumferential surface of the tube sample connecting sleeve is provided with at least one circle of seventh communication holes, the seventh communication holes are arranged along the radial direction of the tube sample connecting sleeve, a plurality of seventh communication holes are arranged around the circumferential surface of the tube sample connecting sleeve at equal angular intervals, and each fifth communication hole is correspondingly provided with a fourth connecting screw.

Further, the base is provided with a sliding groove which is arranged in parallel to the central axis of the vibration shaft;

the support assembly includes a first support, the first support including:

the two ends of the first supporting seat in the width direction are detachably connected with the frame of the base, two rows of first travelling wheels are arranged at the bottom of the first supporting seat, and the two rows of first travelling wheels can move in the sliding groove in a rolling manner along the length direction of the first supporting seat;

the first support frame, first support frame sets up on the first supporting seat, rotationally be provided with two first supporting wheels on the first support frame, two first supporting wheel is followed the width direction of first supporting seat sets up relatively, two first supporting wheel is used for supporting and treats the experiment the other end of pipeline.

Still further, the support assembly includes a second support, the vibration loading assembly disposed between the second support and the power assembly, the second support including:

the second supporting seat is arranged on the outer side of the sliding groove, and two rows of second traveling wheels are arranged at the bottom of the second supporting seat;

the second support frame, the second support frame sets up on the second supporting seat, rotationally be provided with two second supporting wheels on the second support frame, two the second supporting wheel is followed the width direction of second supporting seat sets up relatively, two the second supporting wheel is used for supporting and treats the experiment the other end of pipeline, the center pin of second supporting wheel with the center pin of first supporting wheel is located same horizontal plane.

The beneficial effects of the invention at least comprise:

the invention provides a pipeline fatigue test device, because the output end of the power component of the device can do rotary motion, the vibration shaft of the vibration loading component can be rotationally arranged on the base, the vibration shaft is provided with a first end and a second end which are opposite, the first end of the vibration shaft is connected with the output end of the power component, therefore, the output end of the power component can drive the vibration shaft to rotate, because the polarization block is arranged on the second end of the vibration shaft, the polarization block and the vibration shaft are eccentrically arranged, the rotation of the vibration shaft can drive the polarization block to synchronously rotate to form an excitation source, because the vibration transmission barrel can be rotationally sleeved on the vibration shaft, one end of the pipe sample connecting sleeve is fixedly connected to the outer side of the circumferential surface of the vibration transmission barrel, the other end of the pipe sample connecting sleeve is used for supporting and connecting one end of a pipeline to be tested, the supporting component is used for supporting the other end of, therefore, the vibration source formed by the rotation of the polarization block can ensure that the pipeline to be tested of the vibration source does not rotate but swings in a direction periodically changing along a 360-degree circumference, so that the pipeline to be tested generates continuous periodic bow-shaped bending along the 360-degree circumference, the uniform loading of alternating loads of the full-size pipeline and the welding joint ring thereof to each point position is realized, the full-size pipeline and the welding joint ring thereof can more comprehensively and reliably meet the actual working condition, the overall fatigue performance of the full-size pipeline and the welding joint thereof can be accurately mastered, the accuracy of safety check and fatigue life assessment of the full-size pipeline and the welding joint thereof is improved, the optimization effects of related designs, processes and structures of the full-size pipeline are improved, and the full-size pipeline fatigue.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a pipeline fatigue testing apparatus according to the present embodiment;

FIG. 2 is a schematic structural view of the power assembly of FIG. 1;

FIG. 3 is a schematic structural view of the vibration loading assembly of FIG. 1;

FIG. 4 is a schematic view of the construction of the vibration shaft of FIG. 3;

FIG. 5 is a partial cross-sectional view of the vibratory shaft mounting of FIG. 4;

FIG. 6 is a schematic structural diagram of a polarization block of the present embodiment;

FIG. 7 is a schematic structural view of the vibration-transmitting barrel of FIG. 3;

FIG. 8 is a schematic structural view of the tube-like connecting sleeve of the present embodiment;

FIG. 9 is a schematic view of the first support member shown in FIG. 1;

FIG. 10 is a schematic structural view of the second support member of FIG. 1;

fig. 11 is a schematic diagram of the working state of the present embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic structural diagram of a pipeline fatigue testing apparatus according to this embodiment, and with reference to fig. 1, the apparatus includes a power assembly 1, a vibration loading assembly 3, and a support assembly.

Fig. 2 is a schematic structural diagram of the power assembly in fig. 1, and referring to fig. 1 and fig. 2, the power assembly 1 of this embodiment includes a frame 11, a motor 12, a speed reducer 13, a stand 110 and a power output shaft 15, where the frame 11 is disposed on one side of the vibration applying assembly 3, the motor 12 and the speed reducer 13 are both fixedly disposed on the frame 11, an output shaft of the motor 12 is connected to an input shaft of the speed reducer 13, a first sprocket 17 is disposed on an output shaft of the speed reducer 13, the stand 110 is fixedly disposed on the frame 11, the power output shaft 15 is rotatably disposed on the stand 110, one end of the power output shaft 15 is provided with a second sprocket 19, a diameter of the second sprocket 19 is larger than a diameter of the first sprocket 17, the second sprocket 19 is in transmission connection with the first sprocket 17 through a roller chain 14, and the other end of the power output shaft 15 is an output end of.

Specifically, referring to fig. 2, in the present embodiment, two sides of the frame 11 in the width direction may be symmetrically provided with first connecting ear plates 111, and the first connecting ear plates 111 are provided with connecting holes for fixedly arranging the frame 11.

In this embodiment, the motor 12 may adopt 30kw variable frequency speed regulation, the output shaft of the motor 12 and the input shaft of the speed reducer 13 may be connected by a rigid coupling 16, the reduction ratio of the speed reducer 13 is a two-stage cylindrical gear speed reducer with 5, the diameter ratio of the second sprocket 19 and the first sprocket 17 is 1.2, the second sprocket 19, the first sprocket 17 and the roller chain 14 form a roller chain transmission system with a reduction ratio of 1.2, and the motor 12 may enable the power output shaft 15 to have a suitable output rotation speed by reducing the speed of the speed reducer and the roller chain transmission system.

Further, referring to fig. 2, in the present embodiment, two bearing mounting holes are provided on the stand 110, tapered roller bearings 112 are correspondingly mounted in the two bearing mounting holes, and the power output shaft 15 is mounted in the two tapered roller bearings 112, so that the power output shaft 15 can rotate relative to the stand 110.

Further, in the present embodiment, a one-way clutch 18 is installed at the center of the second sprocket 19 for controlling the power output to the power output shaft 15.

Fig. 3 is a schematic structural diagram of the vibration loading assembly of fig. 1, and with reference to fig. 1 and fig. 3, the vibration loading assembly 3 of this embodiment includes a base 31, a vibration shaft 32, a vibration transmission barrel 33, a polarization block 34, and a tube sample connection sleeve 35, wherein the vibration shaft 32 is rotatably disposed on the base 31, the vibration shaft 32 has a first end and a second end opposite to each other, the first end of the vibration shaft 32 is connected to the output end of the power assembly 1, the polarization block 34 is disposed on the second end of the vibration shaft 32, the polarization block 34 and the vibration shaft 32 are eccentrically disposed, the vibration transmission barrel 33 is rotatably sleeved on the vibration shaft 32, one end of the tube sample connection sleeve 35 is fixedly connected to the outer side of the circumferential surface of the vibration transmission barrel 33, and the other end of the tube sample connection sleeve 35 is used for supporting and connecting one end of.

Specifically, referring to fig. 1, in the present embodiment, a plurality of second connecting ear plates 310 are symmetrically disposed on two sides of the bottom of the base 31 in the width direction, and the second connecting ear plates 310 are provided with connecting holes for fixedly disposing the base 31.

Referring to fig. 1 and fig. 3, in the present embodiment, a supporting box 311 is disposed on the base 31, and two ends of the vibration shaft 32 respectively rotatably penetrate through the supporting box 311, so as to realize the rotatable arrangement of the vibration shaft 32 on the base 31.

Referring to fig. 3, in this embodiment, the supporting box 311 may be made of a thick steel plate by welding, and is welded and fixed to one end of the base 31, and the middle upper portions of the front wall and the rear wall of the supporting box each have a stepped bearing mounting hole, the two bearing mounting holes are coaxial and are symmetrical about the midportion of the front wall and the rear wall, and two double-row tapered roller bearings 38 are respectively disposed in the two bearing mounting holes.

Fig. 4 is a schematic structural diagram of the vibration shaft in fig. 3, fig. 5 is a schematic partial sectional view of the vibration shaft installation in fig. 4, and with reference to fig. 4 and fig. 5, the vibration shaft 32 of this embodiment is a stepped shaft, and includes, in order from a first end to a second end thereof, a power input section 321, a shaft bearing positioning section 322, a swinging load section 323, a vibration transmission barrel installation section 324, and a polarization block installation section 325, the power input section 321 is connected to the other end of the power output shaft 15 through an elastic coupling 2, and both ends of the shaft bearing positioning section 322 are supported on the support box 311 through two double-row tapered roller bearings 38.

Referring to fig. 4, in the present embodiment, the shaft bearing positioning section 322 is a load-bearing member, and thus, the diameter of the shaft bearing positioning section 322 is greater than the diameter of the remaining section of the vibration shaft 32, and the diameters of the swinging load section 323, the vibration transmission tub installation section 324, and the polarization block installation section 325 are sequentially reduced.

Fig. 6 is a schematic structural diagram of the polarization block of the present embodiment, and with reference to fig. 3, 4, 5 and 6, the polarization block 34 in the present embodiment includes a fixed polarization block 36 and a movable polarization block 37, both the fixed polarization block 36 and the movable polarization block 37 are fan-shaped plate structures, the fixed polarization block 36 is fixedly sleeved on the second end of the vibration shaft 32, the movable polarization block 37 is rotatable relative to the vibration shaft 32, and the movable polarization block 37 is operatively and fixedly disposed with the fixed polarization block 36.

Further, with reference to fig. 5 and fig. 6, in the present embodiment, a cylindrical boss 315 is disposed on an end surface of the fixed polarizing block 36 at the center of the circle, and the boss 312 is fitted on the polarizing block mounting section 325.

In this embodiment, the boss 312 and the fixed polarization block 36 are preferably formed integrally, but may be connected by welding, which is not limited in this embodiment.

In this embodiment, the second end of the vibration shaft 32 may be fixedly connected to the middle of the boss 312 in a manner of a lifting key connection, so as to achieve the assembly of the polarization block 34 on the vibration shaft 32.

Referring to fig. 5 and 6, in this embodiment, the inner side end surface of the fixed polarization block 36 may be provided with a plurality of first connection through holes 314, the plurality of first connection through holes 314 are disposed at equal angular intervals around the central axis of the vibration shaft 32, the edge portion of the fixed polarization block 36 is provided with a plurality of second connection through holes 315, the plurality of second connection through holes 315 are disposed at equal angular intervals around the straight line where the center of the circle of the fixed polarization block 36 is located, the center of the circle of the movable polarization block 37 is provided with a connection through hole, the boss on the fixed polarization block 36 is disposed in the connection through hole of the movable polarization block 37 in a clearance fit manner, the inner side of the movable polarization block 37 is provided with a plurality of third connection through holes 316, the plurality of third connection through holes 316 are disposed at equal angular intervals around the central axis of the vibration shaft 32, the third connection through holes 316 and the first connection through holes 314 are disposed correspondingly, the edge portion of the movable polarization block 37 is provided with a plurality of fourth connection through, the plurality of fourth connecting through holes 317 are arranged at equal angular intervals around the straight line where the center of the circle of the movable polarizing block 37 is located, the fourth connecting through holes 317 and the second connecting through holes 315 are arranged in a one-to-one correspondence, and by selecting the corresponding first connecting through holes 314 and the corresponding third connecting through holes to be matched with the first connecting screws, and the corresponding sixth connecting through holes 316 and the corresponding fourth connecting through holes 317 to be matched with the second connecting screws, the relative positions of the movable polarizing block 37 and the fixed polarizing block 36 can be adjusted, so that the sector area and the included angle of the polarizing block 34 can be adjusted.

In this embodiment, the fixed and movable

polarizing blocks

36 and 37 may be sectors of 60 ° to 90 °, and the diameters and angles thereof may be the same.

Fig. 7 is a schematic structural view of the vibration transmission barrel in fig. 3, and in the present embodiment, two fifth communication holes 331 are respectively formed in the cover plates at two ends of the vibration transmission barrel 33 in combination with fig. 7.

Referring to fig. 6 and 7, in the present embodiment, two opposite bearings 39 are sleeved on the middle portion (the vibration transmission barrel mounting section 324) of the vibration shaft 32, and the two bearings 39 are correspondingly and cooperatively disposed in the two fifth communication holes at the two ends of the vibration transmission barrel 33, so that the vibration transmission barrel 33 is rotatably sleeved on the vibration shaft 32.

In this embodiment, the bearing 39 may be a self-aligning roller bearing, but of course, other types of bearings may be used, and this embodiment is not limited thereto.

Fig. 8 is a schematic structural diagram of the tube sample connection sleeve of the present embodiment, and with reference to fig. 6 and 8, in the present embodiment, at least one circle of sixth connection through holes 351 is formed at one end of the circumferential surface of the tube sample connection sleeve 35, the sixth connection holes 351 are arranged along the radial direction of the tube sample connection sleeve 35, a plurality of sixth connection holes 351 are arranged around the circumferential surface of the tube sample connection sleeve 35 at equal angular intervals, the sixth connection holes 351 and third connection screws are arranged in one-to-one correspondence, and the third connection screws penetrate through the corresponding sixth connection holes 351 and enter the circumferential surface of the vibration transmission barrel 33, so that the assembly of the sample connection sleeve 35 and the vibration transmission barrel 33 can be realized.

Further, referring to fig. 6 and 8, in this embodiment, at least one circle of seventh communication holes 352 is formed at the other end of the circumferential surface of the tube-like connecting sleeve 35, the seventh communication holes 352 are formed along the radial direction of the tube-like connecting sleeve 35, a plurality of seventh communication holes 352 are formed at equal angular intervals around the circumferential surface of the tube-like connecting sleeve 35, one fourth connecting screw 353 is correspondingly formed in each fifth communication hole 352, and when one end of the pipe is inserted into the tube-like connecting sleeve 35, the fourth connecting screw 353 is rotated to press the fourth connecting screw 353 against the circumferential surface of the pipe, so that the one end of the pipe can be positioned.

Referring to fig. 3, in the present embodiment, the base 31 is provided with a sliding groove 313, the sliding groove 313 is parallel to the central axis of the vibration shaft 32, and a plurality of sixth connecting through holes 315 are spaced on the frame at two sides of the base 31 in the width direction.

Referring to fig. 1, the support assembly in this embodiment is used to support the other end of a pipe to be tested, and specifically, includes a first support 4 and a second support 5.

Fig. 9 is a schematic structural diagram of the first support member in fig. 1, and with reference to fig. 1, fig. 3 and fig. 9, the first support member 4 of this embodiment includes a first support seat 41 and a first support frame 44, wherein both ends of the width direction of the first support seat 41 are detachably connected to the frame of the base 31, two rows of first traveling wheels 42 are disposed at the bottom of the first support seat 41, the two rows of first traveling wheels 42 can move in the sliding chute in the length direction of the first support seat 41 in a rolling manner, the first support frame 44 is disposed on the first support seat 41, two first support wheels 43 are rotatably disposed on the first support frame 44, the two first support wheels 43 are disposed opposite to each other in the width direction of the first support seat 41, and the two first support wheels 43 are used for supporting the other end of the pipeline to be tested.

Further, in this embodiment, a fixed mounting plate 45 is respectively extended from the middle lower portion of each of the two sides of the first supporting seat in the width direction, each fixed mounting plate 45 is provided with a row of seventh connecting through holes 46 corresponding to the sixth connecting through holes 315 one by one, and the corresponding sixth connecting through holes 315 and the seventh connecting through holes 46 are connected by screws, so that the two ends of the first supporting seat 41 in the width direction can be detachably connected with the frame of the base 31.

In this embodiment, the first traveling wheel 42 may be a solid rubber wheel, the first supporting wheel 43 may be a pneumatic radial rubber tire, and a reverse arc V-shaped bracket may be formed between the two first supporting wheels 43 for supporting the tubular to be tested.

Fig. 10 is a schematic structural diagram of the second support member in fig. 1, and referring to fig. 1, fig. 3 and fig. 10, in this embodiment, the vibration loading assembly 3 is disposed between the second support member 5 and the power assembly 1, the second support member 5 includes a second supporting seat 51 and a second supporting frame 54, wherein the second supporting seat 51 is disposed outside the sliding chute 313, two rows of second traveling wheels 52 are disposed at the bottom of the second supporting seat 51, the second supporting frame 54 is disposed on the second supporting seat 51, two second supporting wheels 53 are rotatably disposed on the second supporting frame 54, the two second supporting wheels 53 are disposed opposite to each other in the width direction of the second supporting seat 51, the two second supporting wheels 53 are used for supporting the other end of the pipeline to be tested, and the central axis of the second supporting wheel 53 and the central axis of the first supporting wheel 43 are located on the same horizontal plane.

The second support member 5 of the present embodiment is substantially similar to the first support member 4, and the difference is mainly that the fixed mounting plates are not provided at both ends of the second support seat 51 in the width direction, and the second support seat 51 and the first support seat 41 have a height difference, which is the thickness of the sliding groove 313, so that the central axis of the second support wheel 53 and the central axis of the first support wheel 43 are located on the same horizontal plane.

Referring to fig. 1, in this embodiment, the vibration loading module 3 is horizontally and fixedly installed, the power module 1 is horizontally fixed to the outer side of one end of the vibration loading module 3 at a distance of 200mm, the power output shaft 15 thereof is coaxial with the vibration shaft 32 of the vibration loading module 3 and is connected through the elastic coupling 2 to achieve power transmission, the first support member 4 is installed in the chute 313 on the base 31 of the vibration loading module 3 and can move along the chute, the distance between the first support member and the tube sample connecting sleeve 35 is determined and adjusted according to calculated tube sample fatigue test parameters, and can be fixed to the base 31 on the vibration loading module 3 by using the fixed mounting plate thereof, the second support member 5 is horizontally installed on the outer side of the other end of the vibration loading module 3 and can move freely, and the distance between the second support member 5 and the first support member 4 is determined and adjusted according to calculated tube sample fatigue test parameters.

Fig. 11 is a schematic diagram of an operating state of the present embodiment, and the installation and the operating process of the present embodiment are described in conjunction with fig. 11 to facilitate understanding of the present invention. .

The vibration loading module 3 of the pipeline fatigue testing device 100 of the embodiment is hung on a flat reinforced concrete installation foundation 101, and after leveling and alignment, a plurality of second connecting lug plates at the bottom of the base 31 are fixed on the installation foundation 101 by anchor bolts; the elastic coupling 2 is arranged in the power input section 321 of the vibration shaft 32 of the vibration loading module 3 to realize the key connection with the vibration shaft 32;

the power assembly 1 of the embodiment is hung 200mm away from the right end of the base 31, and is leveled and aligned with the axes of the power output shaft 15 of the power assembly 1 and the vibration shaft 32 of the vibration loading module 3, and is fixed on the installation foundation 101 through a plurality of first connecting lug plates at the bottom of the frame 11 by foundation bolts;

the elastic coupling 2 moves towards the power output shaft 15 along the power input section of the vibration shaft 32, so that the elastic coupling is in key connection with the power output shaft 15, after the axial length and the position of the key connection of the elastic coupling 2 with the power output shaft 15 and the power input section of the vibration shaft 32 are adjusted, the elastic coupling 2 is radially pushed against the power output shaft 15 and the power input section of the vibration shaft 32 through screws;

the first supporting piece 4 is hung in the sliding groove 313 of the base 31, and after alignment, the first supporting piece is fixed on the base 31;

the second supporting member 5 is hung on the installation base 101, and is aligned with the inverted circular-arc V-shaped pipe-shaped supporting groove on the first supporting member 4, so that the installation of the pipeline fatigue test device 100 of the present embodiment is completed.

For the configuration and connection of the pipe fatigue testing apparatus 100 of the present embodiment, the present embodiment further includes: the frequency converter 102 for controlling speed regulation by the motor 12, the data acquisition system 104 for acquiring pipeline strain data, the water injection pressurization system 105 for pressurizing a test pipeline, and the computer centralized control system 103 for calculating and analyzing a scheme before a fatigue test, controlling equipment, inputting parameters, displaying and outputting data, post-processing data and the like form a resonance type full-size pipeline fatigue test system.

Taking an in-band pressure fatigue test of a test pipeline which is formed by welding two 6m long phi 323 pipe sections, is welded at the tail end of a front end welding sealing end cover and is provided with a water injection interface plugging end cover, and is provided with a butt welding joint in the middle of the length of 12m as an example, the working process of the pipeline fatigue test by adopting the embodiment is described as follows:

before the test is started, analysis and calculation of test parameters are carried out: inputting data such as the diameter, the wall thickness, the length, the material quality, the elastic modulus, the internal pressure, the required test frequency, the amplitude and the like of a test pipeline into a computer centralized control system 103, carrying out simulation calculation analysis and determining a coincidence angle A of the fan-shaped polarization block 34, a distance L1 between the first supporting piece 4 and the front end of the pipe sample connecting sleeve 35, a distance L2 between the first supporting piece 4 and the second supporting piece 5, test parameters such as the rotating speed of a variable-frequency speed-regulating motor and the like;

after the test parameters are determined, the device of the present embodiment is debugged and the test pipe 106 is installed: disassembling the tube sample connecting sleeve 35, adjusting the superposition angle of the fixed polarizing block 36 and the movable polarizing block 37 of the polarizing block 34 to A, and then assembling the tube sample connecting sleeve 35 back; removing the connecting bolt on the first support 4, and moving the first support 4 to a position about +1m away from the front end L1+ of the tube sample connecting sleeve 35; moving the second support 5 to make the distance between the second support 5 and the first support 4L 2; the supporting wheels arranged on the first supporting piece 4 and the second supporting piece 5 matched with the phi 323 pipeline are replaced, so that the installation height of the test pipeline 106 is basically consistent with the height of the pipe sample connecting sleeve 35; the test tube 106 is suspended in the reverse arc V-shaped tube-like support brackets of the first support 4 and the second support 5 with the weld joint positioned at the middle of the 2 supports, and rubber adjustment pads are placed in the reverse arc V-shaped tube-like support brackets of the 2 supports to adjust the test tube 106 to the horizontal with its axis substantially coaxial with the tube-like connection sleeve 35. Push away experimental pipeline 106, drive first support piece 4 and second support piece 5 and remove to pipe appearance adapter sleeve 35, make experimental pipeline 106 front end insert in pipe appearance adapter sleeve 35, stop when first support piece 4 to pipe appearance adapter sleeve 35 front end distance be L1, tighten each connecting bolt on the pipe appearance adapter sleeve 35, with experimental pipeline 106 front end lock in pipe appearance adapter sleeve 35, accomplish experimental pipeline 106 installation.

Test system commissioning and adjustment are performed: and a high-pressure hydraulic hose is connected with a water outlet of the water injection pressurization system 105 and a water injection interface of a plugging end cover at the tail end of the test pipeline 106, and water is injected into the test pipeline 106 to reach the test required pressure. The testing system is started through a computer centralized control system 103, a frequency converter 102 controls and drives a motor 12 to work at a calculated rotating speed, the speed is reduced and the torque is increased through a speed reducer 13 and a roller chain 14, a power output shaft 15 is driven to rotate, the power output shaft 15 drives a vibration shaft 32 to rotate through an elastic coupling 2, the vibration shaft 32 drives a polarization block 34 to rotate together, the vibration shaft 32 generates bending vibration to form a vibration shaft excitation source which swings, the rotation of the vibration shaft excitation source is eliminated through a self-aligning roller bearing which is connected with the vibration shaft 32 and a vibration transmission barrel 33, the vibration shaft excitation source is converted into a target which is connected with the vibration shaft 32 and fixed together, the rotation of the vibration transmission barrel 33 and a pipe sample connecting sleeve 35 is fixed together, but the direction of the target changes periodically along the circumference of 360 degrees, the pipe sample connecting sleeve 35 drives the front end of a testing pipeline 106 fixed in the vibration shaft to generate the same target, and a testing, the continuous bow-shaped bending which does not rotate but has the bending direction periodically changed along the circumference of 360 degrees is formed, and the fatigue is generated. The test pipeline 106 is enabled to reach a stable resonance state by adjusting the rotating speed of the motor 12 or finely adjusting the positions of the two supporting pieces, the amplitude of the position of the welding joint is enabled to reach the test requirement, the first supporting piece 4 is fixed on the base 31 again and is pasted at the positions of 3 points, 6 points, 9 points and 12 points of the welding joint, the groove communication strain gauge group 107 is formed by 2 strain gauges parallel to and perpendicular to a welding seam, the leads of the strain gauges are connected to the data acquisition system 104 by cables, and the strain gauge groups 107 and the data acquisition system 104 are debugged to be in a normal working state, so that the test operation and adjustment of the test system are completed.

The computer centralized control system 103 starts the debugged test system provided with the water injection internal pressure test pipeline 106, monitors and outputs the stress-strain change curve of each subsystem of the test system and the test pipeline 106, and stops the pipeline fatigue test device 100 and the test system to work when the fatigue times reach the specified times or the pipeline and the welding joint thereof are damaged, thereby completing the fatigue test. By summarizing and analyzing the stress-strain data of the pipelines and the welding joints thereof acquired by the test, the fatigue performance of the pipelines can be evaluated, and the welding parameters of the pipelines can be optimized so as to improve the reliability of the pipelines and enhance the safety of the pipelines in the service process.

Experiments show that the method can be used for full-scale fatigue tests of pipelines, the highest test frequency can reach 20Hz, the maximum amplitude can reach 30mm, the operation is stable and reliable, alternating loads at all positions of the annular ring of the pipeline and the welded joint of the pipeline are uniformly loaded, the fatigue test data of the full-scale pipeline and the welded joint of the pipeline more accord with the actual working condition can be obtained, the accuracy of safety checking and fatigue life evaluation can be effectively improved, and the optimization effects of relevant designs, processes and structures are improved.

In addition, the alternating load loading frequency of the fatigue test is obviously improved, the test time can be greatly reduced, the fatigue test efficiency is improved, the test frequency is 9Hz, the amplitude is 15mm, the test time is 31 hours by taking 100 ten thousand times of fatigue tests of a 12m long phi 323 pipeline as an example, compared with the existing fatigue test machine, the test time is reduced by 154 hours and the efficiency is improved by 6 times.

The following embodiments are provided for the purpose of illustrating the present invention and are not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the technical features of the present invention can be modified or changed in some ways without departing from the scope of the present invention.

Claims

1. A pipeline fatigue test device, the device comprising:

the output end of the power assembly (1) can rotate;

a vibration loading component (3), wherein the vibration loading component (3) comprises a base (31), a vibration shaft (32), a vibration transmission barrel (33), a polarization block (34) and a tube-like connecting sleeve (35), wherein the vibration shaft (32) is rotatably provided on the base (31), the vibrating shaft (32) is provided with a first end and a second end which are opposite, the first end of the vibrating shaft (32) is connected with the output end of the power assembly (1), the polarizing block (34) is disposed on a second end of the vibration axis (32), the polarization block (34) and the vibration shaft (32) are eccentrically arranged, the vibration transmission barrel (33) is rotatably sleeved on the vibration shaft (32), one end of the tube sample connecting sleeve (35) is fixedly connected with the outer side of the circumferential surface of the vibration transmission barrel (33), the other end of the pipe sample connecting sleeve (35) is used for supporting and connecting one end of a pipeline to be tested;

2. A pipe fatigue testing device according to claim 1, wherein the power assembly (1) comprises:

a frame (11), the frame (11) being disposed on one side of the base (31);

the motor (12) and the speed reducer (13) are both fixedly arranged on the rack (11), an output shaft of the motor (12) is connected with an input shaft of the speed reducer (13), and a first chain wheel (17) is arranged on an output shaft of the speed reducer (13);

the vertical frame is fixedly arranged on the rack (11);

the power output shaft (15) is rotatably arranged on the stand, one end of the power output shaft (15) is provided with a second chain wheel (19), the diameter of the second chain wheel (19) is larger than that of the first chain wheel (17), the second chain wheel (19) is in transmission connection with the first chain wheel (17) through a roller chain (14), the other end of the power output shaft (15) is an output end of the power assembly (1), and the other end of the power output shaft (15) is connected with the first end of the vibration shaft (32).

3. The pipeline fatigue testing device according to claim 1, wherein a supporting box body is arranged on the base (31), and both ends of the vibration shaft (32) respectively rotatably penetrate through the supporting box body (311).

4. The pipe fatigue testing apparatus of claim 1, wherein the polarization block (34) comprises a fixed polarization block (36) and a movable polarization block (37), the fixed polarization block (36) and the movable polarization block (37) are both of fan-shaped plate-like structure, the fixed polarization block (36) is fixedly sleeved on the second end of the vibration shaft (32), the movable polarization block (37) is rotatable relative to the vibration shaft (32), and the movable polarization block (37) is operatively fixed with the fixed polarization block (36).

5. The pipeline fatigue testing device according to claim 4, wherein a columnar boss (312) is arranged on an end face at the position of the center of the circle of the fixed polarization block (36), the second end of the vibration shaft (32) fixedly penetrates through the middle of the boss (312), a plurality of first connecting through holes (314) are arranged on the end face of the inner side of the fixed polarization block (36), the plurality of first connecting through holes (314) are arranged around the central axis of the vibration shaft (32) at equal angular intervals, a plurality of second connecting through holes (315) are arranged at the edge of the fixed polarization block (36), and the plurality of second connecting through holes (315) are arranged around the straight line where the center of the circle of the fixed polarization block (36) at equal angular intervals;

a connecting through hole is formed in the position of the circle center of the movable polarizing block (37), a boss on the fixed polarizing block (36) is arranged in the connecting through hole of the movable polarizing block (37) in a clearance fit manner, a plurality of third connecting through holes (316) are formed in the inner side of the movable polarizing block (37), the third connecting through holes (316) are arranged around the central axis of the vibrating shaft (32) at equal angular intervals, the third connecting through holes (3160) and the first connecting through holes (314) are correspondingly arranged, a plurality of fourth connecting through holes (317) are formed in the edge position of the movable polarizing block (37), the fourth connecting through holes (317) are arranged around the straight line where the circle center of the movable polarizing block (37) is located at equal angular intervals, and the fourth connecting through holes (317) and the second connecting through holes (315) are arranged in a one-to-one correspondence manner;

the relative positions of the movable polarization block (37) and the fixed polarization block (36) can be adjusted by selecting the corresponding first connecting through hole (314) and the corresponding third connecting through hole (316) to be matched with a first connecting screw, and the corresponding sixth connecting through hole (316) and the corresponding fourth connecting through hole (317) to be matched with a second connecting screw.

6. The pipeline fatigue test device according to claim 1, wherein two opposite bearings (39) are sleeved on the middle part of the vibration shaft (32), two fifth communication holes are respectively arranged on the middle parts of the two ends of the vibration transmission barrel (33), and the two bearings (39) are correspondingly matched and arranged in the two fifth communication holes of the two ends of the vibration transmission barrel (33).

7. The pipeline fatigue test device according to claim 1, wherein one end of the peripheral surface of the pipe sample connection sleeve (35) is provided with at least one circle of sixth communication holes, the sixth communication holes are arranged along the radial direction of the pipe sample connection sleeve (35), a plurality of the sixth communication holes are arranged around the peripheral surface of the pipe sample connection sleeve (35) at equal angular intervals, the sixth communication holes and third connection screws are arranged in a one-to-one correspondence manner, and the third connection screws penetrate through the corresponding sixth communication holes and enter the peripheral surface of the vibration transmission barrel (33).

8. The pipeline fatigue test device according to claim 1, wherein at least one circle of seventh communication holes are formed in the other end of the peripheral surface of the pipe sample connection sleeve (35), the seventh communication holes are arranged along the radial direction of the pipe sample connection sleeve (35), a plurality of seventh communication holes are arranged around the peripheral surface of the pipe sample connection sleeve (35) at equal angular intervals, and a fourth connection screw is correspondingly arranged in each fifth communication hole.

9. A pipeline fatigue testing device according to any one of claims 1-8, wherein the base (31) is provided with a sliding groove arranged parallel to the central axis of the vibration shaft (32);

the support assembly comprises a first support (4), the first support (4) comprising:

the two ends of the width direction of the first supporting seat (41) are detachably connected with the frame of the base (31), two rows of first travelling wheels (42) are arranged at the bottom of the first supporting seat (41), and the two rows of first travelling wheels (42) can roll in the sliding groove to move along the length direction of the first supporting seat (41);

the pipeline supporting device comprises a first supporting frame, wherein the first supporting frame is arranged on a first supporting seat (41), two first supporting wheels (43) are rotatably arranged on the first supporting frame, the first supporting wheels (43) are arranged along the width direction of the first supporting seat (41) oppositely, and the first supporting wheels (43) are used for supporting the other end of the pipeline to be tested.

10. A pipe fatigue testing device according to claim 9, wherein the support assembly comprises a second support (5), the vibration loading assembly (3) being arranged between the second support (5) and the power assembly (1), the second support (5) comprising:

the second supporting seat (51) is arranged on the outer side of the sliding groove, and two rows of second travelling wheels (52) are arranged at the bottom of the second supporting seat (51);

the second support frame, the second support frame sets up on second supporting seat (51), rotationally be provided with two second supporting wheels (53) on the second support frame, two second supporting wheel (53) are followed the width direction of second supporting seat (51) sets up relatively, two second supporting wheel (53) are used for supporting the other end of waiting to test the pipeline, the center pin of second supporting wheel (53) with the center pin of first supporting wheel (43) is located same horizontal plane.