CN112014236A - Oil and gas pipeline local buckling experiment device and method - Google Patents
Oil and gas pipeline local buckling experiment device and method Download PDFInfo
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- CN112014236A CN112014236A CN202010906888.0A CN202010906888A CN112014236A CN 112014236 A CN112014236 A CN 112014236A CN 202010906888 A CN202010906888 A CN 202010906888A CN 112014236 A CN112014236 A CN 112014236A
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- 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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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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
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- G01N2203/0023—Bending
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Abstract
The invention discloses an oil and gas pipeline local buckling experiment device and method, comprising a pipeline bending device; the pipeline bending device comprises a support frame, a rotating part, a transmission chain part, a first telescopic part, a second telescopic part and a driving system; the two rotating pieces are arranged on the supporting frame in a rotating mode at intervals, and arc-shaped gaps for placing the end sides of the pipeline to be tested are formed in the two rotating pieces; the two transmission chain pieces are correspondingly wound on the two rotating pieces, the transmission chain pieces and the rotating pieces are in transmission fit, two first free ends of the two transmission chain pieces are connected through the first telescopic piece, two second free ends of the two transmission chain pieces are connected through the second telescopic piece, and the first telescopic piece and the second telescopic piece are in the same direction; the driving system is connected with the first extensible member and the second extensible member and used for driving the first extensible member and the second extensible member to synchronously and reversely extend and retract.
Description
Technical Field
The invention relates to an oil and gas pipeline local buckling experiment device and method, and belongs to the field of pipeline buckling research devices.
Background
The oil and gas pipeline is complicated in stress in the installation and operation process, and the buckling failure of the pipeline can be influenced by the action of single or multiple external forces. Geographical environment is complicated around the oil gas pipeline, and the land is buried oil gas pipeline and is inevitably occupied by ground facilities such as road, building, deposit and press, and occupation of pressure can cause the differential settlement of ground along with the pipeline operation, and the land subsides that often appear promptly just can produce higher bending stress in the pipeline this moment. In addition, under the condition that geological disasters (such as debris flow, landslide and the like) appear, uneven tension and pressure at different positions can be directly caused to the buried oil and gas pipeline, and then the action of bending moment is exerted on the pipeline. The submarine pipeline is complex due to the fact that terrains such as deep ditches and high hills formed by rocks exist frequently, when a submarine pipeline laying route meets the complex terrain environment, high bending stress can be generated in the pipeline, wave load and the like can cause sea body soil beds to deform under the action of extreme sea conditions, supporting conditions of the pipeline are changed, the pipeline deforms, and the pipeline is also subjected to bending moment in the process. Under the multiple conditions, the oil and gas pipeline can be subjected to the combined action of bending moment, local buckling of the oil and gas pipeline is easy to occur, buckling expansion is further caused, and finally pipeline failure is caused, so that the research on the local buckling of the oil and gas pipeline has important significance.
The existing oil and gas pipeline buckling research mostly adopts finite element software to carry out simulation calculation, and the influence of different factors on the local buckling of the pipeline is analyzed by establishing a pipeline model, a foundation soil body model and a pipe-soil contact interaction model. The reference experiment used a three-point/four-point material bending apparatus. Although the three-point/four-point material bending device commonly used in the market at present can exert a bending moment effect on a pipeline, local pressure can be exerted on a contact part of the pipeline and a pressure head while the bending moment is exerted, the stress concentration phenomenon is obvious, so that the pipeline is subjected to a shearing force effect in the bending deformation process, the requirement of the research on the local buckling of the oil and gas pipeline cannot be met, the three-point/four-point material bending device is not provided with a matched data measurement and acquisition device, and the measurement on the deformation condition of the pipeline after the local buckling is difficult.
Disclosure of Invention
Aiming at the problems, the invention aims to provide an oil and gas pipeline local buckling experiment device and method, which can be used for a local buckling experiment of an oil and gas pipeline under the action of a bending moment, effectively reduce or even eliminate the problem of local stress concentration, and overcome the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme that the oil-gas pipeline local buckling experimental device comprises a pipeline bending device; the pipeline bending device comprises a support frame, a rotating part, a transmission chain part, a first telescopic part, a second telescopic part and a driving system;
the two rotating pieces are rotatably arranged on the supporting frame at intervals, and arc-shaped gaps for placing the pipeline to be tested are formed in the two rotating pieces; the two transmission chain pieces are correspondingly wound on the two rotating pieces, the transmission chain pieces and the rotating pieces are in transmission fit, two first free ends of the two transmission chain pieces are connected through the first telescopic piece, two second free ends of the two transmission chain pieces are connected through the second telescopic piece, and the first telescopic piece and the second telescopic piece are in the same direction; the driving system is connected with the first extensible member and the second extensible member and used for driving the first extensible member and the second extensible member to synchronously and reversely extend and retract.
In some embodiments, the rotating member includes interval parallel distribution's swiveling wheel and weight plate, coaxial wearing to be equipped with the back shaft between swiveling wheel and the weight plate, the both ends of back shaft are fixed through bearing and bearing support respectively on the support frame set up four circle axles, four between the last semicircle of swiveling wheel and weight plate the circle axle is in be the not equidirectional setting of interval 45 degrees on the first semicircle of swiveling wheel and weight plate, every the both ends of circle axle are fixed respectively through two bearings on swiveling wheel and the weight plate, every epaxial and being close to weight plate one side cover of circle is equipped with the sleeve, the sleeve can for the circle axle rotates, telescopic external diameter is from its middle part to both ends crescent, the clearance between four epaxial four sleeves of four circles constitutes the arc space of placing the pipeline that awaits measuring.
In some embodiments, a pipe deformation data acquisition device is further included, the pipe deformation data acquisition device including an external frame, a spring, a fixed block, a ranging module, and a connection frame; the outer frame is the loop configuration, the fixed block is fan-shaped structure, and is a plurality of the fixed block is evenly arranged on same circumferencial direction in the outer frame, the fixed block passes through the spring is fixed on the inner wall of outer frame, every adjacent two arrange a ranging module between the fixed block, ranging module passes through the link is fixed on the inner wall of outer frame.
In some embodiments, the stress-strain data acquisition device further comprises a stress-strain sheet and a stress gauge connected with the stress sheet.
In some embodiments, at least one round shaft is arranged between the rotating wheel and the lower semicircle of the counterweight plate, and two ends of the round shaft are respectively fixed on the rotating wheel and the counterweight plate through two bearings; the counterweight plate is circular, the diameter of the counterweight plate is the same as that of the rotating wheel, and the position of the bearing support is adjustably installed on the support frame.
In some embodiments, the first extensible member and the second extensible member both adopt hydraulic cylinders, and the driving system comprises a hydraulic pump station connected with the hydraulic cylinders, an overflow valve, a reversing valve and a throttle valve which are arranged on the hydraulic pump station, and a control box for controlling the operation of the hydraulic pump station.
In some embodiments, the rotating wheel is a sprocket and the drive chain element is a chain.
In some embodiments, the ranging module is a single-point phase laser ranging sensor module.
In some embodiments, the sleeve further comprises an intermediate rod, and the outer wall of at least part of the rod segment of the intermediate rod is matched with the outer wall of the sleeve.
Additionally, the invention also provides an oil and gas pipeline local buckling experiment method based on the experiment device, which comprises the following steps of:
1) measuring the initial ovality of the pipeline to be measured by using a pipeline deformation data acquisition device;
sleeving a pipeline deformation data acquisition device outside a pipeline to be detected, wherein a plurality of fixed blocks are circumferentially and uniformly distributed on the outer peripheral wall of the pipeline to be detected, then driving an external frame to move along the axial direction of the pipeline to be detected, and a plurality of distance measurement modules acquire diameter data of the pipeline to be detected from all directions and transmit the diameter data to an upper computer;
2) the first telescopic piece is controlled to extend through the driving system, and the second telescopic piece is controlled to contract until the first telescopic piece extends completely and the second telescopic piece contracts completely; then, the first telescopic piece and the second telescopic piece are controlled to do telescopic movement through a driving system, so that the arc-shaped gaps on the two rotating pieces are aligned;
3) placing a pipeline to be tested into a pipeline bending device, clamping two sides of the pipeline to be tested into arc gaps on the two rotating pieces respectively, then, equidistantly attaching strain gages on the pipeline to be tested according to needs, and connecting a strain gauge connected with the strain gages with an upper computer;
4) the driving system controls the first telescopic part to do contraction movement and the second telescopic part to do extension movement, so that the driving chain part is driven to move, the rotating part is driven to rotate, and a bending moment effect is exerted on the pipeline to be measured;
5) after the upper computer collects local buckling stress strain data fed back by a strain gauge through a strain gauge to a strain gauge attached to the pipeline to be tested, closing the driving system; the pipeline deformation data acquisition device is sleeved outside the pipeline to be tested, the pipeline deformation data acquisition device is driven to move along the axial direction of the pipeline to be tested, diameter data of the pipeline to be tested after the experiment is collected and transmitted to the upper computer, and the oil and gas pipeline local buckling experiment is completed under the action of bending moment.
By adopting the technical scheme, the invention has the following advantages: 1. the experimental device provided by the invention comprises a pipeline bending device, wherein the pipeline bending device drives a first telescopic part and a second telescopic part to synchronously and reversely extend and retract through a driving system, so as to drive a transmission chain part to move, further drive a rotating part to rotate, and exert a bending moment effect on a pipeline to be tested, an arc-shaped gap for placing the pipeline to be tested is formed on the rotating part, so that the pipeline to be tested is in surface contact with the rotating part, thereby avoiding applying local pressure on the contact part of the pipeline to be tested and the rotating part while applying the bending moment, effectively reducing or even eliminating the problem of stress concentration, meeting the local buckling research requirement of the oil-gas pipeline, and laying a foundation for the subsequent related research of the oil-gas pipeline. 2. The invention provides a pipeline bending device, wherein a rotating part comprises a rotating wheel and a counterweight plate, four circular shafts are arranged between the rotating wheel and an upper semicircle of the counterweight plate, a sleeve is sleeved on one side, close to the counterweight plate, of each circular shaft, the outer diameter of each sleeve is gradually increased from the middle part to two ends of each circular shaft, the section of the outer wall of each sleeve is in a semicircular arc shape, and gaps among the four sleeves on the four circular shafts form an arc-shaped gap for placing a pipeline to be tested, so that the problem of stress concentration is effectively reduced or even eliminated when local pressure is applied to the contact part of the pipeline to be tested and the rotating part while bending moment is applied, and meanwhile, the stability of the pipeline bending device is ensured when the bending moment is applied. 3. The experiment device provided by the invention also comprises a pipeline deformation data acquisition device, which can acquire diameter data before and after the oil-gas pipeline buckling experiment so as to conveniently obtain deformation data after the oil-gas pipeline local buckling experiment and realize more accurate measurement of the pipeline deformation condition after the local buckling.
Drawings
FIG. 1 is a schematic view of the construction of the pipe bending apparatus of the present invention;
FIG. 2 is a left side view of the pipe bending apparatus of the present invention;
FIG. 3 is a schematic view of the construction of the rotating member of the present invention;
FIG. 4 is a schematic elevational view of the sleeve of the present invention;
FIG. 5 is a left side view schematic of the sleeve of the present invention;
FIG. 6 is a schematic view of the construction of the connector of the present invention;
FIG. 7 is a schematic structural diagram of a pipeline deformation data acquisition device according to the present invention;
FIG. 8 is a schematic structural view of the present invention during a bending test.
Detailed Description
The invention is described in detail below with reference to the figures and examples. It is to be understood, however, that the drawings are provided solely for the purposes of promoting an understanding of the invention and that they are not to be construed as limiting the invention.
As shown in fig. 1, the oil and gas pipeline local buckling experimental device provided by the invention comprises a pipeline bending device 100, wherein the pipeline bending device 100 comprises a support frame 10, a rotating member, a transmission chain member 9, a first telescopic member, a second telescopic member and a driving system; the two rotating pieces are arranged on the support frame 10 in a rotating mode at intervals, and arc-shaped gaps for placing the pipeline to be tested are formed in the two rotating pieces, so that the pipeline to be tested is in surface contact with the rotating pieces; two transmission chain spare correspond around establishing on two rotating members, and be the transmission cooperation between transmission chain spare and the rotating member, connect through first extensible member between two first free ends of two transmission chain spare, connect through the second extensible member between two second free ends of two transmission chain spare, the orientation of first extensible member and second extensible member is the same, actuating system is connected with first extensible member and second extensible member for drive first extensible member and the synchronous reverse concertina movement of second extensible member.
In the above embodiment, preferably, as shown in fig. 1 to 5, the rotating member includes a rotating wheel 1 and a weight plate 2 distributed in parallel at intervals, a supporting shaft coaxially penetrates between the rotating wheel 1 and the weight plate 2, two ends of the supporting shaft are respectively fixed on the supporting frame 10 through a bearing 5 and a bearing support 6, four round shafts 3 are arranged between the upper semicircles of the rotating wheel 1 and the counterweight plate 2, the four round shafts 3 are arranged on the upper semicircles of the rotating wheel 1 and the counterweight plate 2 at intervals of 45 degrees in different directions, two ends of each round shaft 3 are respectively fixed on the rotating wheel 1 and the counterweight plate 2 through bearings 5, a sleeve 4 is sleeved on one side of each round shaft 3, which is close to the counterweight plate 2, the sleeve 4 can rotate relative to the round shaft 3, the outer diameter of the sleeve 4 is gradually increased from the middle part to two ends, the section of the outer wall of the sleeve 4 is in a semi-circular arc shape, and gaps among the four sleeves 4 on the four circular shafts 3 form an arc-shaped gap for placing a pipeline to be tested; during the experiment, the pipeline card that awaits measuring is located on the outer wall of sleeve 4, can prevent firstly that the pipeline that awaits measuring from rolling on round axle 3, secondly change the contact mode between pipeline and the round axle 3 that awaits measuring into the face contact by the point contact, and simultaneously, sleeve 4 can free rotation on round axle 3, and then can effectively reduce the problem of stress concentration.
In the above embodiment, preferably, the present invention further comprises an intermediate rod (not shown in the figures), the outer wall of at least part of the rod segment of the intermediate rod is matched with the outer wall of the sleeve 4, namely, the surface contact is formed between at least part of the rod segment of the intermediate rod and the outer wall of the sleeve 4; during the use, be connected middle member with the pipeline that awaits measuring, utilize middle member and sleeve 4 cooperation for pipeline bending apparatus can be applicable to the pipeline that awaits measuring of different specifications.
In the above embodiment, preferably, the weight plate 2 has a circular shape, and the diameter of the weight plate 2 is the same as that of the rotating wheel 1.
In the above embodiment, preferably, in order to ensure the connection stability between the rotating wheel and the counterweight plate 2, at least one circular shaft 3 is arranged between the rotating wheel 1 and the lower semicircle of the counterweight plate 2, and two ends of the circular shaft 3 are respectively fixed on the rotating wheel 1 and the counterweight plate 2 through bearings 5.
In the above embodiment, it is preferable that the bearing support 6 is position-adjustably mounted on the support bracket 10 to facilitate adjustment of the pipe bending moment application position. Specifically, a plurality of mounting holes are arranged on the support frame 10 at intervals along the length direction of the support frame, or a sliding groove is formed in the support frame 10 along the length direction of the support frame, the bearing support 6 is fixed at the mounting holes or the sliding groove through fasteners, when the position where the pipeline bending moment is applied needs to be adjusted, the fasteners are dismounted, the bearing support 6 is transferred to another mounting hole, or the fasteners are loosened, the bearing support 6 slides to a proper position along the sliding groove, and then the fasteners are locked again.
In the above embodiment, the rotating wheel 1 may preferably be a chain wheel, and the driving chain element 9 may preferably be a chain, and further preferably, the chain wheel and the chain may respectively be a double-row chain wheel and a double-row chain to meet the requirement of experimental strength.
In the above embodiment, preferably, the first extensible member and the second extensible member may both adopt a hydraulic cylinder 7, the driving system includes a hydraulic pump station, an overflow valve, a reversing valve and a throttle valve which are arranged on the hydraulic pump station, and a control box which controls the operation of the hydraulic pump station, and the hydraulic pump station is connected with the hydraulic cylinder 7.
In the above embodiment, preferably, the first free end of the transmission chain element is connected to the first telescopic element, and the second free end of the transmission chain element is connected to the second telescopic element through the connecting element 8, the first free end or the second free end of the transmission chain element is rotatably connected to one end of the connecting element 8, and the other end of the connecting element 8 is rotatably connected to the first telescopic element or the second telescopic element.
In the above embodiment, preferably, as shown in fig. 6, the connecting member 8 is a connecting block in a lifting lug structure, a first mounting through hole 81 is coaxially formed on an arc-shaped large end 80 of the connecting block, a second mounting through hole 83 is coaxially formed on an arc-shaped small end 82 of the connecting block, and a step 84 is formed on one side of the arc-shaped small end 82 of the connecting block; during installation, the arc big end 80 of the connecting block is connected with the first telescopic part or the second telescopic part (for example, a lifting lug on a hydraulic cylinder) in a pin shaft matching manner, the arc small end 82 of the connecting block is connected with the first free end or the second free end of the transmission chain part 9 in a pin shaft matching manner, and the first free end or the second free end of the transmission chain part 9 is located on the side of the step 84 of the arc small end 82, so that the transmission chain part 9, the first telescopic part and the second telescopic part are located on the same vertical plane, and the working stability of the pipeline bending device is improved.
In the above embodiment, preferably, as shown in fig. 7, the present invention further includes a pipe deformation data collecting device 200, where the pipe deformation data collecting device 200 includes an outer frame 11, a spring 12, a fixing block 13, a distance measuring module 14, and a connecting frame 15; the outer frame 11 is of an annular structure, the fixed blocks 13 are of a fan-shaped structure, the fixed blocks 13 are uniformly arranged in the outer frame 11 in the same circumferential direction, the fixed blocks 13 are fixed on the inner wall of the outer frame 11 through springs 12, a distance measuring module 14 is arranged between every two adjacent fixed blocks 13, the distance measuring module 14 is fixed on the inner wall of the outer frame 11 through a connecting frame 15, and the distance measuring module 14 is electrically connected with an upper computer.
In the above embodiment, preferably, four fixing blocks 13 are arranged in the same circumferential direction in the outer frame 11, and the four fixing blocks 13 are arranged in different directions at intervals of 90 degrees in the same circumferential direction.
In the above embodiment, the distance measuring module 14 is preferably a single-point phase high-precision laser distance measuring sensor module. The upper computer can be a computer.
In the above embodiment, preferably, the present invention further includes a stress-strain data acquisition device, where the stress-strain data acquisition device includes a stress sheet and a stress gauge connected to the stress sheet, and the stress gauge is electrically connected to the upper computer.
As shown in fig. 8, based on the oil and gas pipeline local buckling experiment apparatus in any of the above embodiments, the present invention further provides an oil and gas pipeline local buckling experiment method, including the following steps:
1) measuring the initial ovality of the pipeline to be measured by using a pipeline deformation data acquisition device 200;
sleeving a pipeline deformation data acquisition device 200 outside a pipeline to be measured, circumferentially and uniformly distributing a plurality of fixed blocks 13 on the outer peripheral wall of the pipeline to be measured, driving an external frame 11 to move along the axial direction of the pipeline to be measured, and acquiring diameter data of the pipeline to be measured from each direction by a plurality of distance measurement modules 14 and transmitting the diameter data to an upper computer to complete initial ovality measurement of the pipeline to be measured; because the plurality of fixing blocks 13 are connected to the outer frame 11 through the springs 12, resistance between the fixing blocks 13 and the outer peripheral wall of the pipe to be tested is small when the outer frame 11 moves along the axial direction of the pipe to be tested.
2) The first telescopic part is controlled to extend by a driving system until the first telescopic part is fully extended (namely, the maximum stroke of the first telescopic part is reached); controlling the second telescopic part to do contraction movement until the second telescopic part is completely contracted, and preparing for a pipeline buckling experiment; then, the first telescopic piece and the second telescopic piece are controlled to do telescopic movement through the driving system, so that the arc-shaped gap positions on the two rotating pieces are parallel and level, and the pipeline to be measured can be conveniently placed horizontally.
3) The pipeline to be tested is placed into the pipeline bending device 100, the two sides of the pipeline to be tested are respectively clamped in the arc-shaped gaps on the two rotating pieces, then strain gauges are attached to the pipeline to be tested at equal intervals according to needs, and the strain gauges connected with the strain gauges are connected with an upper computer.
4) The first telescopic piece is controlled to contract through the driving system, the second telescopic piece extends out, the transmission chain piece is driven to move, and then the rotating piece is driven to rotate, so that a bending moment effect is exerted on the pipeline to be tested.
5) After the upper computer collects local buckling stress strain data fed back by a strain gauge through a strain gauge to a strain gauge attached to the pipeline to be tested, closing the driving system; the pipeline deformation data acquisition device 100 is sleeved outside the pipeline to be tested, the pipeline deformation data acquisition device 100 is driven to move along the axial direction of the pipeline to be tested, diameter data of the pipeline to be tested are acquired and transmitted to an upper computer, so that a local buckling experiment of the oil and gas pipeline under the action of bending moment is completed, and a foundation is laid for subsequent related researches.
In the above embodiment, preferably, if the local buckling problem of the oil and gas pipeline containing the defects needs to be researched, before the step 1), the pipe wall defects, such as the defects of simple dent, groove, crack, weld joint, corrosion and the like of the pipe wall, can be manually applied to the pipeline to be tested according to the buckling research requirement.
The present invention has been described with reference to the above embodiments, and the structure, arrangement, and connection of the respective members may be changed. On the basis of the technical scheme of the invention, the improvement or equivalent transformation of the individual components according to the principle of the invention is not excluded from the protection scope of the invention.
Claims (10)
1. The utility model provides an oil gas pipeline local buckling experimental apparatus which characterized in that: comprises a pipeline bending device; the pipeline bending device comprises a support frame, a rotating part, a transmission chain part, a first telescopic part, a second telescopic part and a driving system;
the two rotating pieces are rotatably arranged on the supporting frame at intervals, and arc-shaped gaps for placing the pipeline to be tested are formed in the two rotating pieces; the two transmission chain pieces are correspondingly wound on the two rotating pieces, the transmission chain pieces and the rotating pieces are in transmission fit, two first free ends of the two transmission chain pieces are connected through the first telescopic piece, two second free ends of the two transmission chain pieces are connected through the second telescopic piece, and the first telescopic piece and the second telescopic piece are in the same direction; the driving system is connected with the first extensible member and the second extensible member and used for driving the first extensible member and the second extensible member to synchronously and reversely extend and retract.
2. The oil and gas pipeline local buckling experimental device of claim 1, wherein: the rotating member includes interval parallel distribution's swiveling wheel and weight plate, the coaxial back shaft that wears to be equipped with between swiveling wheel and the weight plate, the both ends of back shaft are fixed through bearing and bearing support respectively on the support frame set up four circle axles, four between the last semicircle of swiveling wheel and weight plate the circle axle is in be the equidirectional setting of interval 45 degrees on the first semicircle of swiveling wheel and weight plate, every the both ends of circle axle are fixed respectively through two bearings on swiveling wheel and the weight plate, every epaxial and being close to weight plate side cover of circle is equipped with the sleeve, the sleeve can for the circle axle rotates, telescopic external diameter is crescent from its middle part to both ends, the clearance between four epaxial four sleeves of four circles constitutes the arc space of placing the pipeline that awaits measuring.
3. The oil and gas pipeline local buckling experimental device as claimed in claim 1 or 2, wherein: the pipeline deformation data acquisition device comprises an external frame, a spring, a fixed block, a distance measurement module and a connecting frame; the outer frame is the loop configuration, the fixed block is fan-shaped structure, and is a plurality of the fixed block is evenly arranged on same circumferencial direction in the outer frame, the fixed block passes through the spring is fixed on the inner wall of outer frame, every adjacent two arrange a ranging module between the fixed block, ranging module passes through the link is fixed on the inner wall of outer frame.
4. The oil and gas pipeline local buckling experimental device as claimed in claim 1 or 2, wherein: the stress-strain data acquisition device comprises a stress sheet and a stress meter connected with the stress sheet.
5. The oil and gas pipeline local buckling experimental device of claim 2, wherein:
at least one round shaft is arranged between the rotating wheel and the lower semicircle of the counterweight plate, and two ends of the round shaft are respectively fixed on the rotating wheel and the counterweight block through two bearings; the counterweight plate is circular, the diameter of the counterweight plate is the same as that of the rotating wheel, and the position of the bearing support is adjustably installed on the support frame.
6. The oil and gas pipeline local buckling experimental device of claim 1, wherein: the first extensible member and the second extensible member both adopt hydraulic cylinders, the driving system comprises a hydraulic pump station connected with the hydraulic cylinders, an overflow valve, a reversing valve and a throttle valve which are arranged on the hydraulic pump station, and a control box for controlling the operation of the hydraulic pump station.
7. The oil and gas pipeline local buckling experimental device of claim 2, wherein:
the rotating wheel adopts a chain wheel, and the transmission chain piece adopts a chain.
8. The oil and gas pipeline local buckling experimental device of claim 3, wherein: the distance measurement module is a single-point phase laser distance measurement sensor module.
9. The oil and gas pipeline local buckling experimental device of claim 2, wherein: the outer wall of at least part of the rod section of the middle rod piece is matched with the outer wall of the sleeve.
10. An oil and gas pipeline local buckling experimental method based on the device of claim 3 is characterized by comprising the following steps:
1) measuring the initial ovality of the pipeline to be measured by using a pipeline deformation data acquisition device;
sleeving a pipeline deformation data acquisition device outside a pipeline to be detected, wherein a plurality of fixed blocks are circumferentially and uniformly distributed on the outer peripheral wall of the pipeline to be detected, then driving an external frame to move along the axial direction of the pipeline to be detected, and a plurality of distance measurement modules acquire diameter data of the pipeline to be detected from all directions and transmit the diameter data to an upper computer;
2) the first telescopic piece is controlled to extend through the driving system, and the second telescopic piece is controlled to contract until the first telescopic piece extends completely and the second telescopic piece contracts completely; then, the first telescopic piece and the second telescopic piece are controlled to do telescopic movement through a driving system, so that the arc-shaped gaps on the two rotating pieces are aligned;
3) placing a pipeline to be tested into a pipeline bending device, clamping two sides of the pipeline to be tested into arc gaps on the two rotating pieces respectively, then, equidistantly attaching strain gages on the pipeline to be tested according to needs, and connecting a strain gauge connected with the strain gages with an upper computer;
4) the driving system controls the first telescopic part to do contraction movement and the second telescopic part to do extension movement, so that the driving chain part is driven to move, the rotating part is driven to rotate, and a bending moment effect is exerted on the pipeline to be measured;
5) after the upper computer collects local buckling stress strain data fed back by a strain gauge through a strain gauge to a strain gauge attached to the pipeline to be tested, closing the driving system; the pipeline deformation data acquisition device is sleeved outside the pipeline to be tested, the pipeline deformation data acquisition device is driven to move along the axial direction of the pipeline to be tested, diameter data of the pipeline to be tested after the experiment is collected and transmitted to the upper computer, and the oil and gas pipeline local buckling experiment is completed under the action of bending moment.
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