CN107356385B - Novel marine flexible pipeline stretch bending and press bending combined experiment device - Google Patents
Novel marine flexible pipeline stretch bending and press bending combined experiment device Download PDFInfo
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- CN107356385B CN107356385B CN201710730792.1A CN201710730792A CN107356385B CN 107356385 B CN107356385 B CN 107356385B CN 201710730792 A CN201710730792 A CN 201710730792A CN 107356385 B CN107356385 B CN 107356385B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
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Abstract
The invention discloses a novel marine flexible pipeline stretch bending and press bending combined experimental device which is characterized by comprising a base, and an adjustable fixed trolley, a movable trolley and a first fixed pulley which are arranged on the base along a straight line; the lower end of the adjustable fixed trolley is connected with the base through a toothed rail, the saw tooth extending direction of the toothed rail is perpendicular to the straight line, and the lower end of the adjustable fixed trolley is provided with a tooth surface matched with the toothed rail; the lower extreme both sides of travelling car are equipped with a plurality of wheels respectively, the wheel pass through horizontal spout with base sliding connection, the extending direction of horizontal spout with the straight line is parallel. The experimental device is novel and practical, and can realize various experimental modes by only using the hydraulic cylinder as a power source. In addition, the two can be mutually independent, and the application of respective loads can be effectively controlled. Meanwhile, the loading sequence can be arbitrarily changed according to engineering and design requirements.
Description
Technical Field
The invention relates to a novel mechanical property experimental device capable of realizing stretch bending and press bending combined loading on a large-sized slender marine flexible pipeline.
Background
The sea oil gas resources in China are rich in reserves, and most of the reserves are distributed in deep sea areas such as south China sea. Flexible tubing and the like are one of the indispensable equipment in deep sea hydrocarbon production and are mainly responsible for hydrocarbon transportation between the equipment. The pipe connected between the submarine wellhead and the manifold is called submarine pipe; connected between the manifold and the offshore storage and in a vertical form is called a riser. Flexible pipe structures are typically helically wound from multiple layers of reinforcing members. When the marine flexible pipeline is in-place operation working condition, the pipeline connected to the floating body is subjected to stretch bending combined load due to the action of wind wave current and the reciprocating motion of the platform in a complex marine environment. Because the flexible pipeline is of a complex spiral winding structure, the stress of each layer of component under the action of stretch bending combination presents high-level reciprocating circulation, so that fatigue damage and even abrasion are generated, and finally, the fatigue damage is generated. Thus, the service life of flexible tubing is a critical performance parameter for structural design. In addition, because the pipeline structure is complex, the theory and numerical method are difficult to accurately describe the fatigue failure mechanism, and the failure mechanism and fatigue life estimation are required to be researched by means of experimental simulation. On the other hand, the flexible pipeline for storage, transportation and in-place operation can bear obvious bending combined load at the grounding point due to accidental environmental load, and armor buckling failure is easy to occur when the flexible pipeline is severe, so that great difficulty is brought to repair work.
In summary, it is often difficult to accurately describe the actual mechanical behavior of the pipeline under the combined load by using the theoretical and numerical methods. Therefore, in order to study the mechanical behavior, structural response and failure mechanism of the pipeline under the bending and bending loads in detail, a combined load simulation experiment is required to be carried out on the dangerous section of the marine flexible pipeline through a test method. And the failure rule of the pipeline is found and summarized, so that the damage probability in the use process of the pipeline is reduced, and the service life of the whole pipeline is ensured. The combined load test of the flexible pipeline is an important test of the application condition of the pipeline, and because the research and development of the domestic flexible pipeline is still in a starting state, the experimental test experience under the combined load is insufficient, and a set of specific experimental device is needed to test and verify the flexible pipeline. And the mechanical behavior characteristics and failure mechanisms of the pipeline are researched, so that the experimental key technology of the dynamic riser/cable is comprehensively mastered.
Disclosure of Invention
According to the technical problems, the novel marine flexible pipeline stretch bending and press bending combined experimental device is provided.
According to the actual working conditions, a load equivalent method is adopted to carry out stretch bending and press bending combined load simulation on the marine flexible pipeline. The test equipment is therefore required to include stretching and compression equipment and equipment for applying bending moment to make it undergo reciprocating periodic bending deformation. In addition, the experimental process requires the configuration of measurement equipment, such as strain gauges or sensors, etc., in order to extract the parameter indicators (intermediate or direct physical quantities) associated with the pipe deformation process. The flexible pipeline combined loading experimental procedure is generally as follows: sampling, fixing, laying out sheets, loading, measuring and post-processing modes are developed. Before the experiment starts, a corresponding test scheme is formulated, a pipeline sample is selected, then a pipeline to be tested is fixed on a test frame, strain gauges are arranged at a test position according to the experiment requirement, and the strain gauges are connected to data acquisition equipment. And starting the loading equipment after the operation is ensured to be correct, and simultaneously collecting related data in real time. And finally, analyzing and processing the obtained data to form a perfect experimental report.
The invention adopts the following technical means:
a novel marine flexible pipeline stretch bending and press bending combined experimental device comprises a base, and an adjustable fixed trolley, a movable trolley and a first fixed pulley which are arranged on the base along a straight line;
the lower end of the adjustable fixed trolley is connected with the base through a toothed rail, the sawtooth extending direction of the toothed rail is perpendicular to the straight line, the lower end of the adjustable fixed trolley is provided with tooth surfaces matched with the toothed rail, the adjustable fixed trolley is provided with a second fixed pulley, a first hydraulic cylinder and two first support plates which are parallel to each other, a first cylindrical bending device is arranged between the upper ends of the two first support plates, one end of the first cylindrical bending device, which is close to the movable trolley, is provided with a first connecting flange, side walls on two sides of the first cylindrical bending device are rotationally connected with the first support plates through a first rotating shaft, and the first cylindrical bending device is provided with a first through hole, and the axis of the first through hole coincides with the axis of the first cylindrical bending device;
the lower end both sides of the travelling car are respectively provided with a plurality of wheels, the wheels are in sliding connection with the base through a horizontal chute, the extending direction of the horizontal chute is parallel to the straight line, a car anti-slip block group which is used for fixing the travelling car after the position is adjusted is arranged in the horizontal chute, two mutually parallel second supporting plates and a slideway are arranged on the travelling car, the slideway is positioned between the two second supporting plates, the slideway extends along the straight line, a rack is arranged on the slideway, a second hydraulic cylinder which pushes the rack to slide along the slideway is also arranged on the travelling car, a second cylindrical bending device is arranged between the upper ends of the two second supporting plates, a second through hole is arranged on the second cylindrical bending device, the axis of the second through hole coincides with the axis of the second cylindrical bending device, the second through hole is internally provided with a cylindrical connecting device capable of sliding along the second through hole, the axial length of the cylindrical connecting device is larger than the hole depth of the second through hole, two ends of the cylindrical connecting device are respectively provided with a second connecting flange surface, the middle part of the second connecting flange surface, which is close to one side of the adjustable fixed trolley, is provided with a steel wire rope connecting part, the middle part of the second connecting flange surface, which is far away from one side of the adjustable fixed trolley, is provided with a third through hole which extends to the steel wire rope connecting part along the axis of the cylindrical connecting device, the inner wall of the second through hole is provided with a plurality of grooves which extend along the axis direction parallel to the second through hole, the outer wall of the cylindrical connecting device is provided with convex strips matched with the grooves, the side walls of the two sides of the second cylindrical bending device are rotationally connected with the second supporting plate through a second rotating shaft, a sector gear is fixed on the side wall of the lower side of the second cylindrical bending device, and saw teeth of the sector gear are meshed with saw teeth of the rack;
the second fixed pulleys, the two first support plates which are parallel to each other, the two second support plates which are parallel to each other and the first fixed pulleys are sequentially arranged along the straight line;
the axis of the first cylindrical bending device is perpendicular to the axis of the first rotating shaft;
the axis of the second cylindrical bending device is perpendicular to the axis of the second rotating shaft;
the intersection point of the axis of the first cylindrical bending device and the axis of the first rotating shaft and the intersection point of the axis of the second cylindrical bending device and the axis of the second rotating shaft are positioned in the same horizontal plane, namely the height is consistent, so that the flexible pipeline can be positioned horizontally after being connected;
a third hydraulic cylinder is further arranged on the base;
the novel marine flexible pipeline stretch bending and press bending combined experimental device further comprises a first stretchable steel wire rope and a second stretchable steel wire rope;
in a working state, the first connecting flange surface and the second connecting flange surface close to one side of the adjustable fixed trolley are respectively connected with two ends of a flexible pipeline, a plurality of supporting frames arranged along the axis of the flexible pipeline are arranged in the pipe cavity of the flexible pipeline, a central hole is formed in the middle of each supporting frame, and the axis of each central hole is located on the axis of the flexible pipeline;
one end of the first stretchable steel wire rope is connected with the first hydraulic cylinder, the other end of the first stretchable steel wire rope bypasses the lower edge of the second fixed pulley, winds out from one side, far away from the adjustable fixed trolley, of the second fixed pulley, sequentially penetrates through the first through hole and the central hole to be connected with the steel wire rope connecting part, and the first hydraulic cylinder stretches the first stretchable steel wire rope so as to drive the cylindrical connecting device to compress the flexible pipeline;
one end of the second stretchable steel wire rope is connected with the third hydraulic cylinder, the other end of the second stretchable steel wire rope bypasses the lower edge of the first fixed pulley, winds out from one side, far away from the mobile trolley, of the first fixed pulley, passes through the third through hole and is connected with the steel wire rope connecting part, and the third hydraulic cylinder stretches the second stretchable steel wire rope so as to drive the cylindrical connecting device to stretch the flexible pipeline;
the second hydraulic cylinder drives the sector gear to rotate through the rack, so that bending moment is applied to the flexible pipeline through the second cylindrical bending device, and in the process, the first stretchable steel wire rope and the second stretchable steel wire rope are in a loose state, and at the moment, the vertical displacement of the two ends of the flexible pipeline is zero.
The aperture of the first through hole is smaller, and the first stretchable steel wire rope is allowed to pass through.
The trolley stop slide block group at least comprises two trolley stop slide blocks and is respectively positioned at two sides of a plurality of wheels on one side of the lower end of the corresponding movable trolley.
The second fixed pulleys, the two first supporting plates which are parallel to each other, the two second supporting plates which are parallel to each other and the first fixed pulleys are sequentially arranged along the straight line, so that the first stretchable steel wire rope and the second stretchable steel wire rope are ensured to be positioned in the same vertical plane in each stress direction.
In order to adapt to flexible pipelines with different lengths, the adjustable fixed trolley realizes position adjustment through the toothed rail; butter can be smeared between the tooth surface at the lower end of the adjustable fixed trolley and the toothed rail, so that the contact surface is prevented from rusting;
butter can be smeared between the slide way and the rack, so that smooth sliding is ensured, effective transmission of force is realized, and experimental errors are reduced.
The wire rope connecting portion comprises a round hole communicated with the third through hole, a wire rope connecting column is arranged on the round hole, and the wire rope connecting column extends along the radial direction of the round hole.
The base comprises an upper panel and a lower panel, wherein the upper panel and the lower panel are provided with the toothed rail, the horizontal sliding groove, the third hydraulic cylinder and the first fixed pulley, and a truss is arranged between the upper panel and the lower panel.
The support frame comprises three supporting rods which extend outwards from the central hole and are uniformly distributed by taking the central hole as a circle center, and the free ends of the supporting rods are provided with arc-shaped plates matched with the tube cavities of the flexible pipelines.
The bending test method using the experimental device is as follows:
1. according to the length of the flexible pipeline to be tested, fixing an adjustable fixed trolley at a proper position on the toothed rail, arranging the pipeline to a proper position through fine movement of the movable trolley, and then fixing the movable trolley;
2. the second hydraulic cylinder is connected with the tooth form, so that the second hydraulic cylinder and the tooth form cannot generate relative displacement during movement;
3. fixing the flexible pipeline, ensuring the level of the flexible pipeline and no preloading;
4. according to experimental requirements, strain gauges can be stuck on the surface of the flexible pipeline at proper positions. Meanwhile, one end of a flat cable connected to the strain gauge is fixed on the outer side of the second cylindrical bending device by using an adhesive tape, fluctuation of test data caused by shaking of the flat cable in the test process is prevented, and the other end of the flat cable is connected to the acquisition system, so that real-time transmission of the strain data is realized;
5. the second hydraulic cylinder is connected to the controller, and the controller can load the second hydraulic cylinder to enable the test piece to be subjected to expected bending action;
6. after the whole experimental device is built, the whole testing system is initially debugged. And (3) carrying out small-amplitude loading on the pipeline by driving each hydraulic cylinder, and analyzing the collected curve of the change of the strain along with time. After the test requirement is met, experiments can be carried out in groups;
7. the hydraulic cylinders are controlled to realize multiple loading modes such as step by step, synchronization and the like, and the bending combination loading with different proportions can be set by adjusting the first hydraulic cylinder and the second hydraulic cylinder;
8. when the compression experiment is carried out, the compression experiment of the flexible pipeline is realized by controlling the first hydraulic cylinder; when a bending experiment is carried out, the repeated bending experiment of the flexible pipeline is realized by controlling the second hydraulic cylinder; when the bending combination experiment is carried out, the bending combination experiment of the flexible pipeline is realized by controlling the first hydraulic cylinder and the second hydraulic cylinder;
9. recording the force applied by the second hydraulic cylinder, and measuring the radius of the sector gear to obtain the bending moment applied to the flexible pipeline; simultaneously, recording the horizontal pulling force applied by the first hydraulic cylinder;
10. and carrying out multiple tests, carrying out statistics and error analysis on the acquired data, giving out reasonable test results and finally forming a complete experiment report.
The tensile bending test method by using the experimental device is as follows:
1. according to the length of the flexible pipeline to be tested, fixing an adjustable fixed trolley at a proper position on the toothed rail, arranging the pipeline to a proper position through fine movement of the movable trolley, and then fixing the movable trolley;
2. the second hydraulic cylinder is connected with the tooth form, so that the second hydraulic cylinder and the tooth form cannot generate relative displacement during movement;
3. fixing the flexible pipeline, ensuring the level of the flexible pipeline and no preloading;
4. according to experimental requirements, strain gauges can be stuck on the surface of the flexible pipeline at proper positions. Meanwhile, one end of a flat cable connected to the strain gauge is fixed on the outer side of the second cylindrical bending device by using an adhesive tape, fluctuation of test data caused by shaking of the flat cable in the test process is prevented, and the other end of the flat cable is connected to the acquisition system, so that real-time transmission of the strain data is realized;
5. the second hydraulic cylinder is connected to the controller, and the controller can load the second hydraulic cylinder to enable the test piece to be subjected to expected bending action;
6. after the whole experimental device is built, the whole testing system is initially debugged. And (3) carrying out small-amplitude loading on the pipeline by driving each hydraulic cylinder, and analyzing the collected curve of the change of the strain along with time. After the test requirement is met, experiments can be carried out in groups;
7. the hydraulic cylinders are controlled to realize multiple loading modes such as step by step, synchronization and the like, and stretch bending combined loading with different proportions can be set by adjusting the second hydraulic cylinder and the third hydraulic cylinder;
8. when a stretching experiment is carried out, the stretching experiment of the flexible pipeline is realized by controlling the third hydraulic cylinder; when a bending experiment is carried out, the repeated bending experiment of the flexible pipeline is realized by controlling the second hydraulic cylinder; when a stretch bending combined experiment is carried out, the stretch bending combined experiment of the flexible pipeline is realized by controlling the third hydraulic cylinder and the second hydraulic cylinder;
9. recording the force applied by the second hydraulic cylinder, and measuring the radius of the sector gear to obtain the bending moment applied to the flexible pipeline; simultaneously, recording the horizontal pulling force applied by the third hydraulic cylinder;
10. and carrying out multiple tests, carrying out statistics and error analysis on the acquired data, giving out reasonable test results and finally forming a complete experiment report.
The invention has the following advantages:
1. the experimental device is novel and practical, and can realize various experimental modes by only using the hydraulic cylinder as a power source. In addition, the two can be mutually independent, and the application of respective loads can be effectively controlled. Meanwhile, the loading sequence can be arbitrarily changed according to engineering and design requirements.
2. For the cables with different lengths, the position adjustment of the adjustable fixed trolley can be realized through the toothed rail, the pipeline is arranged to a proper position through the fine movement of the movable trolley, and then the movable trolley is fixed, so that the reasonable arrangement of the pipeline is realized.
3. The device can test various flexible pipelines, such as various bonded pipelines as well as non-bonded pipelines, such as rubber pipes, floating pipes and the like.
4. In the bending process of the flexible pipeline, the flexible pipeline is subjected to the action of pure bending moment load, so that the experimental requirement of pure bending can be met, and the bending moment applied to the flexible pipeline through the second hydraulic cylinder is stable and uniform, so that the later-stage data recording and processing are convenient.
5. The base is composed of the truss structure and the steel plates, so that the bearing is large, steel is saved, and the weight of the whole structure is effectively reduced on the premise of ensuring the whole rigidity and strength. Has the characteristics of designability, economy and the like.
6. The three hydraulic cylinders are power sources, data are recorded conveniently, and a calculation formula for calculating the bending moment applied to the flexible pipeline is simple and easy to calculate and operate.
7. The space around the flexible pipeline is larger, so that corresponding instruments can be conveniently added to measure and record the deformation of the test piece.
8. When a stretch-bending combined load test is performed, the end portions bear tensile forces while the second cylindrical bending device applies bending loads, which can truly simulate a flexible pipe connected to a platform segment.
9. When the bending combination load test is carried out, the compression of the flexible pipeline is realized by tensioning the first stretchable steel wire rope, and the support frame in the pipe cavity of the flexible pipeline enables the compression load to act on the central axis, so that the pure compression test is realized. Moreover, the tensile state of the first tensile steel wire rope does not prevent the application of bending load, and the bending combined loading is fully realized.
10. The experimental device avoids that the actuator directly applies tension or pressure to the pipeline, and the load is transmitted through the rope, so that the actuator is prevented from being greatly damaged by direct action.
Based on the reasons, the invention can be widely popularized in the fields of experimental tests and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic space structure diagram of a novel experimental device for bending and bending a marine flexible pipeline in a stretch bending manner in a specific embodiment of the invention.
Fig. 2 is a schematic view of an assembly of a second cylindrical bending device with a sector gear in an embodiment of the invention.
Fig. 3 is a schematic structural view of a cylindrical connection device in an embodiment of the present invention.
Fig. 4 is a schematic structural view of a support frame according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-4, a novel marine flexible pipeline stretch bending and press bending combined experimental device comprises a base, and an adjustable fixed trolley 1, a movable trolley 2 and a first fixed pulley 3 which are arranged on the base along a straight line;
the lower ends of the adjustable fixed trolleys 1 are connected with the base through tooth-shaped tracks 4, the extension directions of saw teeth of the tooth-shaped tracks 4 are perpendicular to the straight line, tooth surfaces matched with the tooth-shaped tracks 4 are arranged at the lower ends of the adjustable fixed trolleys 1, a second fixed pulley 5, a first hydraulic cylinder 6 and two parallel first support plates 7 are arranged on the adjustable fixed trolleys 1, a first cylindrical bending device 8 is arranged between the upper ends of the two first support plates 7, a first connecting flange surface is arranged at one end, close to the movable trolleys 2, of the first cylindrical bending device 8, two side walls of the first cylindrical bending device 8 are in rotary connection with the first support plates 7 through first rotating shafts 9, first through holes are formed in the first cylindrical bending devices 8, and the axes of the first through holes coincide with the axes of the first cylindrical bending devices 8;
the two sides of the lower end of the moving trolley 2 are respectively provided with a plurality of wheels 10, the wheels 10 are in sliding connection with the base through a horizontal chute 11, the extending direction of the horizontal chute 11 is parallel to the straight line, a trolley anti-slip block group used for fixing the moving trolley 2 after the position is adjusted is arranged in the horizontal chute 11, two mutually parallel second support plates 12 and a slideway 13 are arranged on the moving trolley 2, the slideway 13 is positioned between the two second support plates 12, the slideway 13 extends along the straight line, a rack 14 is arranged on the slideway 13, a second hydraulic cylinder 15 pushing the rack 14 to slide along the slideway 13 is also arranged on the moving trolley 2, a second cylindrical bending device 16 is arranged between the upper ends of the two second support plates 12, a second through hole 17 is arranged on the second cylindrical bending device 16, the axis of the second through hole 17 coincides with the axis of the second cylindrical bending device 16, a cylindrical connecting device 18 capable of sliding along the second through hole 17 is arranged in the second through hole 17, the axial length of the cylindrical connecting device 18 is larger than the hole depth of the second through hole 17, two ends of the cylindrical connecting device 18 are respectively provided with a second connecting flange surface 19, the middle part of the second connecting flange surface 19 close to one side of the adjustable fixed trolley 1 is provided with a wire rope connecting part 20, the middle part of the second connecting flange surface 19 far away from one side of the adjustable fixed trolley 1 is provided with a third through hole extending to the wire rope connecting part 20 along the axis of the cylindrical connecting device 18, the inner wall of the second through hole 17 is provided with a plurality of grooves 21 extending along the direction parallel to the axis of the second through hole 17, the outer wall of the cylindrical connecting device 18 is provided with convex strips 22 matched with the grooves 21, the two side walls of the second cylindrical bending device 16 are rotatably connected with the second supporting plate 12 through a second rotating shaft 23, a sector gear 24 is fixed on the lower side wall of the second cylindrical bending device 16, and the saw teeth of the sector gear 24 are meshed with the saw teeth of the rack 14;
the second fixed pulley 5, the two first support plates 7 parallel to each other, the two second support plates 12 parallel to each other, and the first fixed pulley 3 are sequentially arranged along the straight line;
the axis of the first cylindrical bending device 8 is perpendicular to the axis of the first rotation shaft 9;
the axis of the second cylindrical bending device 16 is perpendicular to the axis of the second rotation shaft 23;
the intersection point of the axis of the first cylindrical bending device 16 and the axis of the first rotating shaft 9 and the intersection point of the axis of the second cylindrical bending device 16 and the axis of the second rotating shaft 23 are located in the same horizontal plane;
the base is also provided with a third hydraulic cylinder 25;
the novel marine flexible pipeline stretch bending and press bending combined experimental device further comprises a first stretchable steel wire rope 26 and a second stretchable steel wire rope 27;
in the working state, the first connecting flange surface and the second connecting flange surface 19 close to one side of the adjustable fixed trolley 1 are respectively connected with two ends of a flexible pipeline 28, a plurality of supporting frames arranged along the axis of the flexible pipeline 28 are arranged in the lumen of the flexible pipeline 28, a central hole 29 is arranged in the middle of each supporting frame, and the axis of each central hole 29 is positioned on the axis of the flexible pipeline 28;
one end of the first stretchable steel wire rope 26 is connected with the first hydraulic cylinder 6, the other end of the first stretchable steel wire rope 26 bypasses the lower edge of the second fixed pulley 5 and winds out from one side of the second fixed pulley 5 away from the adjustable fixed trolley 1, and sequentially passes through the first through hole and the central hole 29 to be connected with the steel wire rope connecting part 20, and the first hydraulic cylinder 6 stretches the first stretchable steel wire rope 26 so as to drive the cylindrical connecting device 18 to compress the flexible pipeline 28;
one end of the second stretchable steel wire rope 27 is connected with the third hydraulic cylinder 25, the other end of the second stretchable steel wire rope 27 bypasses the lower edge of the first fixed pulley 3, winds out from one side of the first fixed pulley 3 away from the travelling car 2, passes through the third through hole and is connected with the steel wire rope connecting part, and the third hydraulic cylinder 25 stretches the second stretchable steel wire rope 27 so as to drive the cylindrical connecting device 18 to stretch the flexible pipeline 28;
the second hydraulic cylinder 15 rotates the sector gear 24 through the rack gear 14, thereby applying a bending moment to the flexible pipe 28 through the second cylindrical bending device 16.
The wire rope connecting portion 20 comprises a round hole communicated with the third through hole, a wire rope connecting column is arranged on the round hole, and the wire rope connecting column extends along the radial direction of the round hole.
The base comprises an upper panel 30 and a lower panel 31, wherein the upper panel 30 and the lower panel 31 are provided with the toothed rail 4, the horizontal sliding groove 11, the third hydraulic cylinder 25 and the first fixed pulley 3, and a truss 32 is arranged between the upper panel 30 and the lower panel 31.
The support frame comprises three supporting rods 33 which extend outwards from the central hole 29 and are uniformly distributed by taking the central hole 29 as a circle center, and the free ends of the supporting rods 33 are provided with arc plates 34 matched with the tube cavities of the flexible pipelines 28.
The trolley anti-slip block group at least comprises two trolley anti-slip blocks 35 and is respectively positioned at two sides of a plurality of wheels 10 on one side of the lower end of the corresponding movable trolley 2.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme recorded in each embodiment can be modified or some or all technical features in the technical scheme can be replaced equivalently; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the scope of the technical solutions of the examples of the present invention.
Claims (2)
1. The novel marine flexible pipeline stretch bending and press bending combined experimental device is characterized by comprising a base, and an adjustable fixed trolley, a movable trolley and a first fixed pulley which are arranged on the base along a straight line;
the lower end of the adjustable fixed trolley is connected with the base through a toothed rail, the sawtooth extending direction of the toothed rail is perpendicular to the straight line, the lower end of the adjustable fixed trolley is provided with tooth surfaces matched with the toothed rail, the adjustable fixed trolley is provided with a second fixed pulley, a first hydraulic cylinder and two first support plates which are parallel to each other, a first cylindrical bending device is arranged between the upper ends of the two first support plates, one end of the first cylindrical bending device, which is close to the movable trolley, is provided with a first connecting flange, side walls on two sides of the first cylindrical bending device are rotationally connected with the first support plates through a first rotating shaft, and the first cylindrical bending device is provided with a first through hole, and the axis of the first through hole coincides with the axis of the first cylindrical bending device;
the lower end both sides of the travelling car are respectively provided with a plurality of wheels, the wheels are in sliding connection with the base through a horizontal chute, the extending direction of the horizontal chute is parallel to the straight line, a car anti-slip block group which is used for fixing the travelling car after the position is adjusted is arranged in the horizontal chute, two mutually parallel second supporting plates and a slideway are arranged on the travelling car, the slideway is positioned between the two second supporting plates, the slideway extends along the straight line, a rack is arranged on the slideway, a second hydraulic cylinder which pushes the rack to slide along the slideway is also arranged on the travelling car, a second cylindrical bending device is arranged between the upper ends of the two second supporting plates, a second through hole is arranged on the second cylindrical bending device, the axis of the second through hole coincides with the axis of the second cylindrical bending device, the second through hole is internally provided with a cylindrical connecting device capable of sliding along the second through hole, the axial length of the cylindrical connecting device is larger than the hole depth of the second through hole, two ends of the cylindrical connecting device are respectively provided with a second connecting flange surface, the middle part of the second connecting flange surface, which is close to one side of the adjustable fixed trolley, is provided with a steel wire rope connecting part, the middle part of the second connecting flange surface, which is far away from one side of the adjustable fixed trolley, is provided with a third through hole which extends to the steel wire rope connecting part along the axis of the cylindrical connecting device, the inner wall of the second through hole is provided with a plurality of grooves which extend along the axis direction parallel to the second through hole, the outer wall of the cylindrical connecting device is provided with convex strips matched with the grooves, the side walls of the two sides of the second cylindrical bending device are rotationally connected with the second supporting plate through a second rotating shaft, a sector gear is fixed on the side wall of the lower side of the second cylindrical bending device, and saw teeth of the sector gear are meshed with saw teeth of the rack;
the second fixed pulleys, the two first support plates which are parallel to each other, the two second support plates which are parallel to each other and the first fixed pulleys are sequentially arranged along the straight line;
the axis of the first cylindrical bending device is perpendicular to the axis of the first rotating shaft;
the axis of the second cylindrical bending device is perpendicular to the axis of the second rotating shaft;
an intersection point of the axis of the first cylindrical bending device and the axis of the first rotating shaft and an intersection point of the axis of the second cylindrical bending device and the axis of the second rotating shaft are located in the same horizontal plane;
a third hydraulic cylinder is further arranged on the base;
the novel marine flexible pipeline stretch bending and press bending combined experimental device further comprises a first stretchable steel wire rope and a second stretchable steel wire rope;
in a working state, the first connecting flange surface and the second connecting flange surface close to one side of the adjustable fixed trolley are respectively connected with two ends of a flexible pipeline, a plurality of supporting frames arranged along the axis of the flexible pipeline are arranged in the pipe cavity of the flexible pipeline, a central hole is formed in the middle of each supporting frame, and the axis of each central hole is located on the axis of the flexible pipeline;
one end of the first stretchable steel wire rope is connected with the first hydraulic cylinder, the other end of the first stretchable steel wire rope bypasses the lower edge of the second fixed pulley, winds out from one side, far away from the adjustable fixed trolley, of the second fixed pulley, sequentially penetrates through the first through hole and the central hole to be connected with the steel wire rope connecting part, and the first hydraulic cylinder stretches the first stretchable steel wire rope so as to drive the cylindrical connecting device to compress a flexible pipeline;
one end of the second stretchable steel wire rope is connected with the third hydraulic cylinder, the other end of the second stretchable steel wire rope bypasses the lower edge of the first fixed pulley, winds out from one side, far away from the mobile trolley, of the first fixed pulley, passes through the third through hole and is connected with the steel wire rope connecting part, and the third hydraulic cylinder stretches the second stretchable steel wire rope so as to drive the cylindrical connecting device to stretch a flexible pipeline;
the second hydraulic cylinder drives the sector gear to rotate through the rack, so that bending moment is applied to the flexible pipeline through the second cylindrical bending device;
the steel wire rope connecting part comprises a round hole communicated with the third through hole, a steel wire rope connecting column is arranged on the round hole, and the steel wire rope connecting column extends along the radial direction of the round hole;
the base comprises an upper panel and a lower panel, wherein the upper panel and the lower panel are provided with the toothed rail, the horizontal sliding groove, the third hydraulic cylinder and the first fixed pulley, and a truss is arranged between the upper panel and the lower panel.
2. The novel marine flexible pipeline stretch bending and press bending combined experimental device according to claim 1, wherein the experimental device is characterized in that: the support frame comprises three supporting rods which extend outwards from the central hole and are uniformly distributed by taking the central hole as a circle center, and the free ends of the supporting rods are provided with arc-shaped plates matched with the tube cavities of the flexible pipelines.
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