CN107356385B - Novel marine flexible pipeline stretch bending and press bending combined experiment device - Google Patents

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

A new type of tensile bending and compression bending combined experimental device for marine flexible pipelines

technical field

The invention relates to a novel mechanical performance experimental device capable of realizing combined loading of tension bending and compression bending on large-scale slender marine flexible pipelines.

Background technique

my country's offshore oil and gas reserves are abundant, and most of them are distributed in deep waters such as the South China Sea. Flexible pipelines are one of the indispensable equipment in deep sea oil and gas exploitation, and they are mainly responsible for oil and gas transportation between equipment. The pipeline connected between the subsea wellhead and the manifold is called a subsea pipeline; the vertical one connected between the manifold and the offshore storage device is called a riser. Flexible piping structures are usually helically wound from multiple layers of reinforcing members. When the marine flexible pipeline is in-situ operating conditions, due to the wind, wave and current and the reciprocating movement of the platform in a complex ocean environment, the pipeline connected to the floating body will be subjected to combined tension and bending loads. Since the flexible pipe itself is a complex helical winding structure, the stress of each layer of components under the combination of tension and bending presents a high-level reciprocating cycle, which will cause fatigue damage or even wear, and eventually fatigue failure. Therefore, the service life of flexible pipes is a key performance parameter in structural design. In addition, due to the complex structure of the pipeline, it is difficult to accurately describe the fatigue failure mechanism by theoretical and numerical methods. It is necessary to use experimental simulation to study the failure mechanism and fatigue life estimation. On the other hand, flexible pipelines for storage, transportation and in-situ operation will bear obvious combined compression and bending loads at the touchdown point due to accidental environmental loads. In severe cases, buckling failure of armor is prone to occur, which brings great difficulties to repair work.

In summary, theoretical and numerical methods are often difficult to accurately describe the actual mechanical behavior of the pipeline under this combined load. Therefore, in order to study in detail the mechanical behavior, structural response and failure mechanism of the pipeline under tension and compression bending loads, it is necessary to conduct combined load simulation experiments on the dangerous section of the marine flexible pipeline through experimental methods. Discover and summarize the failure rules of pipelines, reduce the probability of pipeline damage during use, and ensure the entire service life of pipelines. The combined load test of flexible pipelines is an important test for the application of pipelines. Since the research and development of flexible pipelines in China is still in its infancy, the experimental test experience under combined loads is still insufficient, and a set of targeted experimental equipment is urgently needed to test flexible pipelines. Test and verify. Study the mechanical behavior characteristics and failure mechanism of the pipeline, so as to fully grasp the key technology of dynamic riser/cable test.

Contents of the invention

According to the technical problems raised above, a new type of combined tensile bending and compression bending experimental device for marine flexible pipelines is provided.

According to the actual working conditions, the load equivalent method is used to simulate the combined load of tension bending and compression bending on the marine flexible pipeline. Therefore, the test equipment needs to include tension, compression equipment and equipment that applies a bending moment to cause reciprocating periodic bending deformation. In addition, the experimental process needs to be equipped with measuring equipment, such as strain gauges or sensors, in order to extract relevant parameters (intermediate or direct physical quantities) of the pipeline deformation process. The experimental process of combined loading of flexible pipelines is usually carried out in the following steps: sampling, fixation, patching, loading, measurement and post-processing. Before the start of the experiment, it is necessary to formulate the corresponding test plan and select the pipeline samples, then fix the pipeline to be tested on the test frame, arrange the strain gauges at the test position according to the experimental requirements, and connect them to the data acquisition equipment. After ensuring that the above operations are correct, start the loading device and collect relevant data in real time. Finally, analyze and process the obtained data and form a perfect experiment report.

The technical means adopted in the present invention are as follows:

A novel marine flexible pipe tension bending and bending combined experimental device, including a base and an adjustable fixed trolley, a moving trolley and a first fixed pulley arranged on the base along a straight line;

The lower end of the adjustable fixed trolley is connected to the base through a toothed track, the zigzag extension direction of the toothed track is perpendicular to the straight line, and the lower end of the adjustable fixed trolley has a The tooth surface of the adjustable fixed trolley is provided with a second fixed pulley, a first hydraulic cylinder and two first support plates parallel to each other, and a first column is arranged between the upper ends of the two first support plates. A bending device, the end of the first cylindrical bending device close to the moving trolley has a first connecting flange surface, and the side walls on both sides of the first cylindrical bending device are connected to the first rotating shaft through the first rotating shaft. The support plate is rotatably connected, 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;

Both sides of the lower end of the mobile trolley are respectively provided with a plurality of wheels, and the wheels are slidably connected to the base through a horizontal chute. The extension direction of the horizontal chute is parallel to the straight line. There is a trolley anti-sliding block set for fixing the position of the mobile trolley, and the mobile trolley is provided with two parallel second support plates and slideways, and the slideways are located between the two second support plates. Between, the slideway extends along the straight line, the slideway is provided with a rack, and the mobile trolley is also provided with a second hydraulic cylinder to push the rack to slide along the slideway, and the two A second cylindrical bending device is provided between the upper ends of the second supporting plate, and a second through hole is arranged on the second cylindrical bending device, and the axis of the second through hole is in line with the second cylindrical bending The axes of the devices coincide, and the second through hole is provided with a cylindrical connecting device that can slide along the second through hole, and the axial length of the cylindrical connecting device is greater than the depth of the second through hole, so The two ends of the cylindrical connection device are respectively provided with a second connection flange surface, and the middle part of the second connection flange surface close to the side of the adjustable fixed trolley is provided with a wire rope connection part, far away from the adjustable fixed trolley. The middle part of the second connecting flange surface on one side of the trolley is provided with a third through hole extending along the axis of the cylindrical connecting device to the connecting part of the wire rope, and the inner wall of the second through hole is provided with a plurality of Along the groove extending parallel to the axis of the second through hole, the outer wall of the cylindrical connecting device is provided with raised lines matching the groove, and the side walls on both sides of the second cylindrical bending device The second rotating shaft is rotatably connected to the second support plate, and the lower side wall of the second cylindrical bending device is fixed with a sector gear, and the saw teeth of the sector gear mesh with the saw teeth of the rack;

The second fixed pulley, the two first supporting plates parallel to each other, the two second supporting plates parallel to each other and the first fixed pulley are arranged sequentially along the straight line;

the axis of the first cylindrical bending device is perpendicular to the axis of the first rotation 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 located in the same horizontal plane, that is, the height Consistent, so that after the flexible pipe is connected, it can be in a horizontal position;

The base is also provided with a third hydraulic cylinder;

The novel marine flexible pipeline tensile bending and bending combined experimental device also includes a first stretchable steel wire rope and a second stretchable steel wire rope;

In the working state, the first connecting flange surface and the second connecting flange surface close to the side of the adjustable fixed trolley are respectively connected to the two ends of the flexible pipe, and the lumen of the flexible pipe is provided with a plurality of A support frame arranged along the axis of the flexible pipeline, a central hole is arranged in the middle of the support frame, and the axis of the central hole is located on the axis of the flexible pipeline;

One end of the first stretchable steel rope is connected to the first hydraulic cylinder, and the other end of the first stretchable steel rope goes around the lower edge of the second fixed pulley and is away from the second fixed pulley. One side of the adjustable fixed trolley goes out, and passes through the first through hole and the central hole in turn to connect with the wire rope connection part, and the first hydraulic cylinder tightens the first stretchable The steel wire rope drives the cylindrical connecting device to compress the flexible pipe, and the second stretchable steel wire rope is in a relaxed state during the above process;

One end of the second stretchable steel rope is connected to the third hydraulic cylinder, and the other end of the second stretchable steel rope goes around the lower edge of the first fixed pulley and is away from the first fixed pulley. One side of the mobile trolley winds out and connects with the wire rope connection part through the third through hole, and the third hydraulic cylinder tightens the second stretchable wire rope to drive the cylindrical connection The device stretches the flexible pipeline. In the above process, the first stretchable steel wire rope is in a relaxed state;

The second hydraulic cylinder drives the sector gear to rotate through the rack, thereby applying a bending moment to the flexible pipe through the second cylindrical bending device. In the above process, the first stretchable steel wire rope and the second The two stretchable steel wire ropes are all in a relaxed state, and at this moment, the vertical displacement at both ends of the flexible pipe is zero.

The diameter of the first through hole is relatively small, and it only needs to allow the passage of the first stretchable steel wire rope.

The trolley anti-sliding block set includes at least two trolley anti-sliding blocks, which are respectively located on both sides of the plurality of wheels on the lower end side of the corresponding mobile trolley.

The second fixed pulley, the two first support plates parallel to each other, the two second support plates parallel to each other, and the first fixed pulley are arranged in sequence along the straight line, ensuring that the first The stress directions of the stretchable steel wire rope and the second stretchable steel wire rope are located in the same vertical plane.

In order to adapt to flexible pipes of different lengths, the adjustable fixed trolley realizes position adjustment through the toothed track; grease can be applied between the tooth surface of the lower end of the adjustable fixed trolley and the toothed track to prevent the contact surface from being rust;

Grease can be applied between the slideway and the rack to ensure smooth sliding, realize effective transmission of force, and reduce experimental errors.

The wire rope connecting portion includes a circular hole communicating with the third through hole, a wire rope connecting column is arranged on the circular hole, and the steel wire connecting column extends radially of the circular hole.

The base includes an upper panel and a lower panel provided with the toothed track, the horizontal chute, the third hydraulic cylinder and the first fixed pulley, and the upper panel and the lower panel are provided with There are trusses.

The support frame includes three struts that extend outward from the central hole and are evenly distributed with the central hole as the center of a circle, and the free ends of the struts are provided with arc-shaped plates that match the lumen of the flexible pipe .

The bending test method using the experimental device is as follows:

1. According to the length of the flexible pipeline to be tested, fix the adjustable fixed trolley at a suitable position on the toothed track, arrange the pipeline to a suitable position by moving the trolley slightly, and then fix the trolley;

2. Connect the second hydraulic cylinder with the tooth shape to ensure that the two cannot be displaced relative to each other during movement;

3. Fix the flexible pipe to ensure the level of the flexible pipe without preloading;

4. According to the requirements of the experiment, the strain gauges can be pasted at the appropriate position on the surface of the flexible pipe. At the same time, use adhesive tape to fix one end of the cable connected to the strain gauge to the outside of the second cylindrical bending device to prevent the fluctuation of test data caused by the shaking of the cable during the test process, and connect the other end to the acquisition system to realize real-time transmission of strain data;

5. Connect the second hydraulic cylinder to the controller, and the second hydraulic cylinder can be loaded through the controller to make the specimen subject to the expected bending action;

6. After the entire experimental device is built, the entire test system is initially debugged. The pipeline is loaded with a small amplitude by driving each hydraulic cylinder, and the curve of the collected strain changing with time is analyzed. After the test requirements are met, experiments can be carried out in groups;

7. Control each hydraulic cylinder to realize multiple loading methods such as step-by-step and synchronous. By adjusting the first hydraulic cylinder and the second hydraulic cylinder, different proportions of bending combined loading can be set;

8. During the compression test, the compression test of the flexible pipeline is realized by controlling the first hydraulic cylinder; when the bending test is performed, the repeated bending test of the flexible pipeline is realized by controlling the second hydraulic cylinder; when the combined bending test is performed, By controlling the first hydraulic cylinder and the second hydraulic cylinder, the combined bending experiment of the flexible pipeline is realized;

9. Record the force applied by the second hydraulic cylinder, measure the radius of the sector gear, and obtain the bending moment applied to the flexible pipe; at the same time, record the horizontal tension applied by the first hydraulic cylinder;

10. Perform multiple tests and conduct statistics and error analysis on the collected data, give reasonable test results and finally form a complete experimental report.

Using this experimental device to carry out the tensile bending test method is as follows:

1. According to the length of the flexible pipeline to be tested, fix the adjustable fixed trolley at a suitable position on the toothed track, arrange the pipeline to a suitable position by moving the trolley slightly, and then fix the trolley;

2. Connect the second hydraulic cylinder with the tooth shape to ensure that the two cannot be displaced relative to each other during movement;

3. Fix the flexible pipe to ensure the level of the flexible pipe without preloading;

4. According to the requirements of the experiment, the strain gauges can be pasted at the appropriate position on the surface of the flexible pipe. At the same time, use adhesive tape to fix one end of the cable connected to the strain gauge to the outside of the second cylindrical bending device to prevent the fluctuation of test data caused by the shaking of the cable during the test process, and connect the other end to the acquisition system to realize real-time transmission of strain data;

5. Connect the second hydraulic cylinder to the controller, and the second hydraulic cylinder can be loaded through the controller to make the specimen subject to the expected bending action;

6. After the entire experimental device is built, the entire test system is initially debugged. The pipeline is loaded with a small amplitude by driving each hydraulic cylinder, and the curve of the collected strain changing with time is analyzed. After the test requirements are met, experiments can be carried out in groups;

7. Control each hydraulic cylinder to realize multiple loading methods such as step-by-step and synchronous. By adjusting the second hydraulic cylinder and the third hydraulic cylinder, different ratios of stretch-bending combined loading can be set;

8. When performing the stretching test, the stretching test of the flexible pipe is realized by controlling the third hydraulic cylinder; when performing the bending test, the repeated bending test of the flexible pipe is realized by controlling the second hydraulic cylinder; , by controlling the third hydraulic cylinder and the second hydraulic cylinder, the combined stretching and bending experiment of the flexible pipeline is realized;

9. Record the force applied by the second hydraulic cylinder, measure the radius of the sector gear, and obtain the bending moment applied to the flexible pipe; at the same time, record the horizontal tension applied by the third hydraulic cylinder;

10. Perform multiple tests and conduct statistics and error analysis on the collected data, give reasonable test results and finally form a complete experimental report.

The present invention has the following advantages:

1. The experimental device is novel and practical, and it can realize various experimental methods only relying on the hydraulic cylinder as the power source. Moreover, the two are independent of each other and can effectively control the application of their respective loads. At the same time, arbitrary transformation of the loading sequence can be realized according to engineering and design requirements.

2. For different lengths of pipe cables, the position adjustment of the adjustable fixed trolley can be realized through the toothed track, and the pipeline can be arranged to a suitable position through the slight movement of the moving trolley, and then the moving trolley can be fixed to realize the reasonable arrangement of the pipeline. The present invention has superior flexibility.

3. The device can test various flexible pipes, such as rubber pipes, floating pipes and other adhesive pipes and non-adhesive pipes.

4. During the bending process of the flexible pipeline, the flexible pipeline is subjected to pure bending moment load, which can realize the experimental requirements of pure bending, and the bending moment applied to the flexible pipeline through the second hydraulic cylinder is relatively stable and uniform, which is convenient for later data recording and processing.

5. The base of the present invention is composed of a truss structure and steel plates, which bears heavy weight and saves steel materials, effectively reducing the weight of the overall structure on the premise of ensuring the overall rigidity and strength. It has the characteristics of designability and economy.

6. The power sources of the three hydraulic cylinders of the present invention are convenient for data recording, and the calculation formula for calculating the bending moment applied to the flexible pipeline is simple, easy to calculate and operate.

7. There is a large space around the flexible pipe, which is convenient for adding corresponding instruments to measure and record the deformation of the test piece.

8. When performing the combined tension-bend load test, while the end is under tension, the second cylindrical bending device applies a bending load. This behavior can truly simulate the flexible pipeline connected to the platform section.

9. When carrying out the compression-bending combined load test, the compression of the flexible pipe is realized by tightening the first stretchable steel wire rope, and the support frame in the lumen of the flexible pipe makes the compressive load act on the central axis to realize a pure compression test . Moreover, the stretched state of the first stretchable steel wire rope does not hinder the application of the bending load, fully realizing the combination of compression and bending loading.

10. The experimental device avoids the actuator directly applying tension or pressure to the pipeline, and transmits the load through the rope to avoid direct action to cause greater damage to the actuator.

Based on the above reasons, the present invention can be widely promoted in fields such as experimental testing.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic diagram of the spatial structure of a new type of combined tensile bending and bending bending experimental device for marine flexible pipelines in a specific embodiment of the present invention.

Fig. 2 is a schematic diagram of the assembly of the second cylindrical bending device and the sector gear in the specific embodiment of the present invention.

Fig. 3 is a schematic structural view of a cylindrical connection device in a specific embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a support frame in a specific embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Fig. 1-Fig. 4, a new type of combined tensile bending and compression bending experimental device for marine flexible pipelines includes a base and an adjustable fixed trolley 1, a mobile trolley 2 and a first fixed trolley arranged on the base along a straight line. pulley 3;

The lower end of the adjustable fixed trolley 1 is connected to the base through a toothed track 4, the sawtooth extension direction of the toothed track 4 is perpendicular to the straight line, and the lower end of the adjustable fixed trolley 1 has a The tooth surface matching the shaped track 4, the adjustable fixed trolley 1 is provided with a second fixed pulley 5, a first hydraulic cylinder 6 and two first support plates 7 parallel to each other, and the two first support plates A first cylindrical bending device 8 is provided between the upper ends of 7, and the end of the first cylindrical bending device 8 near the mobile trolley 2 has a first connecting flange surface, and the first cylindrical bending device 8 has a The sidewalls on both sides are rotatably connected to the first support plate 7 through the first rotating shaft 9, and the first cylindrical bending device 8 is provided with a first through hole, and the axis of the first through hole is in line with the first through hole. The axes of the cylindrical bending device 8 coincide;

Both sides of the lower end of the mobile trolley 2 are respectively provided with a plurality of wheels 10, and the wheels 10 are slidably connected with the base through a horizontal chute 11, the extension direction of the horizontal chute 11 is parallel to the straight line, and the The horizontal chute 11 is provided with a trolley anti-slip block group fixed after adjusting the position of the mobile trolley 2. The mobile trolley 2 is provided with two second support plates 12 and slideways 13 parallel to each other. The track 13 is located between the two second support plates 12, the slideway 13 extends along the straight line, the slideway 13 is provided with a rack 14, and the mobile trolley 2 is also provided with a The rack 14 slides along the second hydraulic cylinder 15 of the slideway 13, and a second cylindrical bending device 16 is arranged between the upper ends of the two second support plates 12. On the second cylindrical bending device 16 A second through hole 17 is provided, the axis of the second through hole 17 coincides with the axis of the second cylindrical bending device 16, and the second through hole 17 is provided with a Sliding cylindrical connecting device 18, the axial length of the cylindrical connecting device 18 is greater than the hole depth of the second through hole 17, and the 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 the side of the adjustable fixed trolley 1 is provided with a wire rope connecting portion 20, and the second connecting flange surface 19 on the side away from the adjustable fixed trolley 1 A third through hole extending along the axis of the cylindrical connection device 18 to the wire rope connection part 20 is provided in the middle of the middle part, and the inner wall of the second through hole 17 is provided with a plurality of 17 is a groove 21 extending in the axial direction, the outer wall of the cylindrical connecting device 18 is provided with a raised strip 22 matching the groove 21, and the side walls on both sides of the second cylindrical bending device 16 pass through the second The rotating shaft 23 is rotatably connected with the second support plate 12, and the lower side wall of the second cylindrical bending device 16 is fixed with a sector gear 24, and the saw teeth of the sector gear 24 mesh with the saw teeth of the rack 14 ;

The second fixed pulley 5, the two first support plates 7 parallel to each other, the second support plates 12 parallel to each other and the first fixed pulley 3 are arranged sequentially along the straight line;

The axis of the first cylindrical bending device 8 is perpendicular to the axis of the first rotating shaft 9;

The axis of the second cylindrical bending device 16 is perpendicular to the axis of the second rotating 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 on the same horizontal plane Inside;

The base is also provided with a third hydraulic cylinder 25;

The new type of combined tensile and bending experimental device for marine flexible pipelines also includes 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 the side of the adjustable fixed trolley 1 are connected to the two ends of the flexible pipe 28 respectively, and the lumen of the flexible pipe 28 There are a plurality of support frames arranged along the axis of the flexible pipe 28, a central hole 29 is provided in the middle of the support frame, and the axis of the central hole 29 is located on the axis of the flexible pipe 28;

One end of the first stretchable steel rope 26 is connected to the first hydraulic cylinder 6, and the other end of the first stretchable steel rope 26 goes around the lower edge of the second fixed pulley 5 and passes from the first fixed pulley 5. The two fixed pulleys 5 go out from the side away from the adjustable fixed trolley 1, and pass through the first through hole and the central hole 29 in sequence to connect with the wire rope connection part 20, and the first hydraulic cylinder 6 tensioning the first stretchable wire rope 26 to drive the cylindrical connecting device 18 to compress the flexible pipe 28;

One end of the second stretchable steel rope 27 is connected to the third hydraulic cylinder 25, and the other end of the second stretchable steel rope 27 goes around the lower edge of the first fixed pulley 3 and passes from the first fixed pulley 3. A certain pulley 3 is wound out from the side away from the mobile trolley 2, and connected to the wire rope connection part through the third through hole, and the third hydraulic cylinder 25 tightens the second stretchable wire rope 27 so as to drive the cylindrical connecting device 18 to stretch the flexible pipe 28;

The second hydraulic cylinder 15 drives the sector gear 24 to rotate through the rack 14 , so as to apply a bending moment to the flexible pipe 28 through the second cylindrical bending device 16 .

The wire rope connecting portion 20 includes a round hole communicating with the third through hole, a wire rope connecting post is arranged on the round hole, and the wire rope connecting post extends along the radial direction of the round hole.

The base includes an upper panel 30 and a lower panel 31 provided with the toothed track 4, the horizontal chute 11, the third hydraulic cylinder 25 and the first fixed pulley 3, the upper panel 30 and the Trusses 32 are arranged between the lower panels 31 .

The support frame includes three struts 33 that extend outward from the central hole 29 and are evenly distributed with the central hole 29 as the center of a circle. The free ends of the struts 33 are provided with Matching curved panels 34 .

The trolley anti-sliding block set includes at least two trolley anti-sliding blocks 35 which are respectively located on two sides of the plurality of wheels 10 on the side of the lower end of the corresponding mobile trolley 2 .

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing examples, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the examples of the present invention.

Claims (2)

1. A novel marine flexible pipeline tensile bending and bending combined experimental device is characterized in that it includes a base and an adjustable fixed trolley, a mobile trolley and a first fixed pulley arranged on the base along a straight line; The lower end of the adjustable fixed trolley is connected to the base through a toothed track, the zigzag extension direction of the toothed track is perpendicular to the straight line, and the lower end of the adjustable fixed trolley has a The tooth surface of the adjustable fixed trolley is provided with a second fixed pulley, a first hydraulic cylinder and two first support plates parallel to each other, and a first column is arranged between the upper ends of the two first support plates. A bending device, the end of the first cylindrical bending device close to the moving trolley has a first connecting flange surface, and the side walls on both sides of the first cylindrical bending device are connected to the first rotating shaft through the first rotating shaft. The support plate is rotatably connected, 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; Both sides of the lower end of the mobile trolley are respectively provided with a plurality of wheels, and the wheels are slidably connected to the base through a horizontal chute. The extension direction of the horizontal chute is parallel to the straight line. There is a trolley anti-sliding block set for fixing the position of the mobile trolley, and the mobile trolley is provided with two parallel second support plates and slideways, and the slideways are located between the two second support plates. Between, the slideway extends along the straight line, the slideway is provided with a rack, and the mobile trolley is also provided with a second hydraulic cylinder to push the rack to slide along the slideway, and the two A second cylindrical bending device is provided between the upper ends of the second supporting plate, and a second through hole is arranged on the second cylindrical bending device, and the axis of the second through hole is in line with the second cylindrical bending The axes of the devices coincide, and the second through hole is provided with a cylindrical connecting device that can slide along the second through hole, and the axial length of the cylindrical connecting device is greater than the depth of the second through hole, so The two ends of the cylindrical connection device are respectively provided with a second connection flange surface, and the middle part of the second connection flange surface close to the side of the adjustable fixed trolley is provided with a wire rope connection part, far away from the adjustable fixed trolley. The middle part of the second connecting flange surface on one side of the trolley is provided with a third through hole extending along the axis of the cylindrical connecting device to the connecting part of the wire rope, and the inner wall of the second through hole is provided with a plurality of Along the groove extending parallel to the axis of the second through hole, the outer wall of the cylindrical connecting device is provided with raised lines matching the groove, and the side walls on both sides of the second cylindrical bending device The second rotating shaft is rotatably connected to the second support plate, and the lower side wall of the second cylindrical bending device is fixed with a sector gear, and the saw teeth of the sector gear mesh with the saw teeth of the rack; The second fixed pulley, the two first supporting plates parallel to each other, the two second supporting plates parallel to each other and the first fixed pulley are arranged sequentially along the straight line; the axis of the first cylindrical bending device is perpendicular to the axis of the first rotation shaft; the axis of the second cylindrical bending device is perpendicular to the axis of the second rotating shaft; The intersection of the axis of the first cylindrical bending device and the axis of the first rotating shaft and the intersection 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 also provided on the base; The novel marine flexible pipeline tensile bending and bending combined experimental device also includes a first stretchable steel wire rope and a second stretchable steel wire rope; In the working state, the first connecting flange surface and the second connecting flange surface close to the side of the adjustable fixed trolley are respectively connected to the two ends of the flexible pipe, and the lumen of the flexible pipe is provided with a plurality of A support frame arranged along the axis of the flexible pipeline, a central hole is arranged in the middle of the support frame, and the axis of the central hole is located on the axis of the flexible pipeline; One end of the first stretchable steel rope is connected to the first hydraulic cylinder, and the other end of the first stretchable steel rope goes around the lower edge of the second fixed pulley and is away from the second fixed pulley. One side of the adjustable fixed trolley goes out, and passes through the first through hole and the central hole in turn to connect with the wire rope connection part, and the first hydraulic cylinder tightens the first stretchable The steel wire rope thereby drives the cylindrical connecting device to compress the flexible pipe; One end of the second stretchable steel rope is connected to the third hydraulic cylinder, and the other end of the second stretchable steel rope goes around the lower edge of the first fixed pulley and is away from the first fixed pulley. One side of the mobile trolley winds out and connects with the wire rope connection part through the third through hole, and the third hydraulic cylinder tightens the second stretchable wire rope to drive the cylindrical connection The device stretches the flexible pipe; The second hydraulic cylinder drives the sector gear to rotate through the rack, thereby applying a bending moment to the flexible pipeline through the second cylindrical bending device; The wire rope connecting portion includes a round hole communicating with the third through hole, the round hole is provided with a wire rope connecting post, and the steel wire connecting post extends radially along the round hole; The base includes an upper panel and a lower panel provided with the toothed track, the horizontal chute, the third hydraulic cylinder and the first fixed pulley, and the upper panel and the lower panel are provided with There are trusses. 2. A new type of combined tensile bending and bending experimental device for marine flexible pipelines according to claim 1, characterized in that: the support frame includes three It is a strut whose center is evenly distributed, and the free end of the strut is provided with an arc-shaped plate matching the lumen of the flexible pipe.

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