Experimental device for composite pipe based on multiple working conditions

Abstract

According to the experimental device for the composite pipe based on the multiple working conditions, an L-shaped baffle is fixed to the left end of a supporting seat plate, and a rotary supporting device installed on the L-shaped baffle and a position-adjustable supporting device installed on the supporting seat plate are coaxially arranged; the outer ends of the rotary supporting device and the position-adjustable supporting device are fixedly connected with water injection pipes communicating with the interiors of the rotary supporting device and the position-adjustable supporting device in a sealed mode. The rotary supporting device is fixedly connected with the left end of the composite pipe in a sealed mode, and the position-adjustable supporting device is fixedly connected with the right end of the composite pipe in a sealed mode to test the internal pressure working condition or the torsion working condition or the stretching working condition or the torsion working condition or the stretching working condition or the bending working condition of the composite pipe. According to the utility model, one end of the composite pipe is reliably supported when the other end of the composite pipe is fixed, conditions are provided for experiments under internal pressing, stretching, bending, twisting and composite working conditions of the composite pipe, the defects of complexity, higher cost and high maintenance difficulty of a traditional experimental device are overcome, and the experiments under various working conditions are more accurately and conveniently completed.

Description

Technical Field

[0001] The utility model belongs to the technical field of composite pipe experimental devices, and particularly relates to an experimental device for composite pipes based on multiple working conditions. Background Art

[0002] With the improvement of oil and gas production capacity, deepwater oil and gas resources have gradually become the focus of people's attention. Due to the lightness, high strength, excellent flexibility and corrosion resistance of thermoplastic composite pipes, they have great potential in the field of deep-sea oil and gas development and are expected to receive more widespread attention and application in the future. In order to achieve the requirements of longer life and higher safety during the service of composite pipes, the experimental device of composite pipes becomes particularly important. Accurate experimental data will provide a more accurate reference basis for the production and use of composite pipes. The production process of composite pipes is relatively complex, which also leads to the design and manufacture of experimental devices being more complex, more expensive, and more difficult to maintain. In addition, the working conditions of composite pipes in service are relatively complex. Under normal circumstances, they will be affected by multiple environments and loads at the same time. This also leads to the need for the experimental device to be able to simulate multiple working conditions at the same time. Therefore, in response to the above problems, an experimental device with a simple structure, easy maintenance and the ability to simulate multiple environmental conditions is provided, which can complete experiments more accurately and conveniently. Utility Model Content

[0003] The technical problem solved by the present invention is to provide an experimental device for composite pipes based on multiple working conditions, by arranging a rotation support device installed on the L-shaped baffle and sealed and fixedly connected to one end of the composite pipe on the support base plate and a position-adjustable support device installed on the support base plate and sealed and fixedly connected to the other end of the composite pipe, thereby achieving reliable support for the composite pipe in a rotating state with one end and a fixed state with the other end, providing conditions for experiments under internal pressure, tension, bending, torsion and composite working conditions of the composite pipe, solving the defects of traditional experimental devices being complicated, more expensive and difficult to maintain, being able to simulate multiple environmental working conditions, and completing experiments under various working conditions more accurately and conveniently, having a simple structure, novel design, being easy to maintain, easy to assemble and repair, low cost and easy to promote and use.

[0004] The technical solution adopted by the utility model is: an experimental device for composite pipes based on various working conditions, comprising a base, a support base plate fixed to the upper end surface of the base, an L-shaped baffle fixed to the left end of the support base plate, and a rotation support device installed on the L-shaped baffle and a position-adjustable support device installed along the support base plate are coaxially arranged, and the outer ends of the rotation support device and the position-adjustable support device are both sealed and fixedly connected with a water injection pipe communicating with the interior thereof;

[0005] The rotating support device is sealed and fixedly connected to the left end of the composite pipe, and the position-adjustable support device is sealed and connected to the right end of the composite pipe. Pressurized water is injected into the interior of the composite pipe through the water injection pipes at both ends, or a torsional force is applied to the left end of the composite pipe through the rotating support device, or a horizontal traction force is applied to the position-adjustable support device, or a downward pressure is applied to the position-adjustable support device, to realize experiments on the internal pressure working condition, torsional working condition, tensile working condition or bending working condition of the composite pipe.

[0006] In which, the position-adjustable support device includes a slider and a right locking connection assembly, the upper surface of the support seat plate is fixed with a guide rail along its length direction, and the slider is adaptively connected to the guide rail, the right end of the composite pipe is fixedly connected to the left end of the right locking connection assembly, and the right end of the right locking connection assembly is fixedly connected to the right water injection pipe, the slider is axially positioned and connected to the right locking connection assembly, and when the slider moves along the length direction of the guide rail, the position-adjustable support device is moved and adjusted along the length direction of the support seat plate, and the slider is provided with a fixing bolt whose inner end is pressed against the guide rail.

[0007] Furthermore, the right locking connection assembly includes a locking joint, a locking nut and a right twist handle, the locking joint is a T-shaped sleeve structure, the right end of the composite pipe is fixedly connected to the small diameter section of the left end of the locking joint, and the locking nut which is sleeved on the locking joint and positioned with its large diameter section is threadedly connected to the left end of the right twist handle, and the right twist handle and the locking joint are tightened and sealed under the tightening connection action of the locking nut; two sliders are symmetrically provided on both sides of the right end of the guide rail, which are adapted to be connected to the guide grooves on their corresponding sides, and the sliders are L-shaped stepped structure, the right twist handle is located between the two sliders, and the locking bolt threadedly connected to the upper end of the vertical edge of the slider is adapted to the positioning ring groove on the outer circumferential wall of the right twist handle, and the inner end of the locking bolt is contacted and locked with the bottom of the positioning ring groove by rotating the locking bolt, so as to realize locking and fixing the right end of the composite pipe.

[0008] Furthermore, a sealing ring is installed on the left end surface of the right twist handle, which contacts and seals with the right end surface of the locking joint.

[0009] Furthermore, the rotation support device includes a locking joint, a locking nut, a connecting joint and a left twist handle. The lower end of the L-shaped baffle is formed with an avoidance groove for avoiding the guide rail, and the avoidance groove and the lower end of the L-shaped baffle adapted to the guide rail are fixed to the support seat plate. A bearing is positioned and installed in the stepped hole on the vertical plate surface of the L-shaped baffle, and the pressure cover fixed on the left side surface of the vertical plate of the L-shaped baffle positions the bearing. The connecting joint is a multi-step stepped sleeve structure, and the small diameter section at the left end of the connecting joint is adapted to be connected with the bearing and passes through the pressure cover and is threadedly fixed to the left twist handle. The left end of the composite pipe is fixedly connected to the small diameter section at the right end of the locking joint, and the locking nut which is sleeved on the locking joint and positioned with its large diameter section is threadedly connected to the right end of the connecting joint, and the left twist handle and the locking joint are tightened and sealed under the tightening connection action of the locking nut.

[0010] Furthermore, a sealing ring is installed on the right end surface of the connecting joint and is in contact and pressed against the left end surface of the locking joint.

[0011] Furthermore, the locking joint includes a core tube and a locking sleeve, the outer contour of the core tube is a three-level stepped sleeve structure with the diameter decreasing from the outside to the inside, a positioning convex ring is formed on the outer edge of the inner hole of the locking sleeve, and the positioning convex ring is adapted to the positioning groove on the outer wall of the middle diameter section of the core tube, the inner hole wall of the locking sleeve and the outer circumferential wall of the small diameter section of the core tube are both provided with a plurality of teeth grooves, and the composite tube that is sleeved on the small diameter section of the core tube and located between the teeth grooves of the small diameter section of the core tube and the teeth grooves on the inner hole wall of the locking sleeve is sealed and fixed to the core tube by the compression-deformed locking sleeve, thereby realizing a sealed and fixed connection between the end of the composite tube and the locking joint.

[0012] Furthermore, the small-diameter section of the core tube is formed with a plurality of sealing grooves, and the sealing rings adapted to fit in the sealing grooves are in contact and sealed with the inner hole wall of the composite tube end.

[0013] Furthermore, the left twist handle and the right twist handle both have a conical sleeve structure with an outer end diameter larger than an inner end diameter, and the flanges at the two water injection pipe mouths are fixed to the large diameter end faces of the left twist handle and the right twist handle respectively by multiple bolts, and are connected to the center holes inside the left twist handle and the right twist handle.

[0014] Furthermore, the support seat plate is a channel steel with its opening facing downward, and the channel steel is fixed on the base.

[0015] The advantages of this utility model compared with the prior art are:

[0016] 1. This technical solution provides reliable support for the composite pipe while one end is rotating and the other end is fixed by providing a rotation support device mounted on the L-shaped baffle and sealed and fixedly connected to one end of the composite pipe on the support base plate, and an adjustable position support device mounted on the support base plate and sealed and fixedly connected to the other end of the composite pipe. This provides conditions for experiments under internal pressure, tension, bending, torsion, and composite working conditions of the composite pipe, and solves the defects of traditional experimental equipment such as complexity, higher cost, and difficult maintenance.

[0017] 2. This technical solution adopts a locking joint consisting of a core tube with grooves on the outer tube wall and a locking sleeve with grooves on the inner hole wall, providing conditions for the rapid and reliable connection between the composite tube and the locking joint. By providing multiple sealing grooves with sealing rings on the outer circumferential wall of the small-diameter section of the core tube, a reliable seal between the composite tube and the locking joint is achieved, meeting the sealing requirements of the internal pressure test and achieving accurate and effective completion of the internal pressure test.

[0018] 3. With the cooperation of the guide rail and the slider, this technical solution provides adaptive position adjustment conditions for experiments under bending, torsion and tension conditions, ensuring the smooth and stable progress of the experimental process;

[0019] 4. This technical solution has a simple structure, novel design, easy maintenance, easy assembly and repair, low cost, and is easy to promote and use. It can simulate a variety of environmental conditions and can complete experiments under various working conditions more accurately and conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a cross-sectional view of the structure of the utility model;

[0021] Figure 2 for Figure 1 A in the middle is a partial enlarged schematic diagram;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the utility model;

[0023] Figure 4 This is a schematic diagram of the state of the utility model during the twisting working condition;

[0024] Figure 5 This is a schematic diagram of the state of the utility model during stretching working condition;

[0025] Figure 6 This is a schematic diagram of the state of the utility model during bending working condition. DETAILED DESCRIPTION

[0026] The following is a combination of the embodiments of the present invention Figure 1-6The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0027] It should be noted that, in this document, unless otherwise stated, it should be understood that the terms "center," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate positions or relationships based on those shown in the accompanying drawings. These are intended only to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] As used herein, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the elements.

[0029] Composite pipe experimental device based on various working conditions, such as Figure 1-6 As shown, it includes a base 8, a support base plate 7 is fixed to the upper end surface of the base 8, an L-shaped baffle 6 is fixed to the left end of the support base plate 7, and a rotation support device installed on the L-shaped baffle 6 and a position-adjustable support device installed on the support base plate 7 are coaxially arranged, and the outer ends of the rotation support device and the position-adjustable support device are both sealed and fixedly connected with a water injection pipe 1 connected to the interior thereof;

[0030] like Figure 3-6As shown, the rotating support device is sealed and fixedly connected to the left end of the composite pipe 9, and the position-adjustable support device is sealed and connected to the right end of the composite pipe 9, and pressurized water is injected into the composite pipe 9 through the water injection pipes 1 at both ends, or a torsional force is applied to the left end of the composite pipe 9 through the rotating support device, or a horizontal traction force is applied to the position-adjustable support device, or a downward pressure is applied to the position-adjustable support device, so as to realize the experiment of the internal pressure working condition, torsional working condition, tensile working condition or bending working condition of the composite pipe 9; in the above structure, a rotating support device installed on the L-shaped baffle 6 and sealed and fixedly connected to one end of the composite pipe 9 and a position-adjustable support device installed on the support base plate 7 and sealed and fixedly connected to the other end of the composite pipe 9 are provided on the support base plate 7, so as to realize reliable support of one end of the composite pipe 9 in a rotating state while the other end is fixed, thereby providing conditions for experiments under internal pressure, tension, bending, torsion and composite working conditions of the composite pipe 9, and solving the defects of traditional experimental devices being complicated, more expensive and difficult to maintain;

[0031] The specific structure of the position-adjustable support device is as follows: the position-adjustable support device includes a slider 5 and a right locking connection assembly, the upper plate surface of the support seat plate 7 is fixed with a guide rail 10 along its length direction, and the slider 5 is adaptively connected to the guide rail 10, and under the cooperation of the guide rail 10 and the slider 5, adaptive position adjustment conditions are provided for experiments under bending conditions, torsion conditions and tensile conditions, ensuring that the experimental process is carried out smoothly and stably; the right end of the composite pipe 9 is fixedly connected to the left end of the right locking connection assembly, and the right end of the right locking connection assembly is fixedly connected to the right water injection pipe 1, the slider 5 is axially positioned and connected to the right locking connection assembly, and when the slider 5 moves along the length direction of the guide rail 10, the position-adjustable support device is moved and adjusted along the length direction of the support seat plate 7, and the slider 5 is provided with a fixing bolt with an inner end portion pressed against the guide rail 10; specifically, the specific structure of the right locking connection assembly is as follows: the right locking connection assembly includes a locking joint 3, a locking nut 14 and The right twist handle 2, the locking joint 3 is a T-shaped sleeve structure, the right end of the composite pipe 9 is fixedly connected to the small diameter section of the left end of the locking joint 3, and the locking screw sleeve 14 which is sleeved on the locking joint 3 and positioned with its large diameter section is threadedly connected to the left end of the right twist handle 2, and under the tightening connection action of the locking screw sleeve 14, the right twist handle 2 and the locking joint 3 are tightened and sealed; two sliders 5 are symmetrically provided on both sides of the right end of the guide rail 10, which are adapted to be connected to the guide grooves on their corresponding sides, and the sliders 5 are L-shaped stepped structure, the right twist handle 2 is located between the two sliders 5, and the locking bolt 13 threadedly connected to the upper end of the vertical edge of the slider 5 is adapted to the positioning ring groove 15 on the outer circumferential wall of the right twist handle 2, and the inner end of the locking bolt 13 is contacted and locked with the bottom of the positioning ring groove 15 by rotating the locking bolt 13 to achieve locking and fixing of the right end of the composite pipe 9; specifically, the left end face of the right twist handle 2 is equipped with a sealing ring which contacts and seals with the right end face of the locking joint 3.

[0032] The specific structure of the rotation support device is as follows: the rotation support device includes a locking joint 3, a locking nut 14, a connecting joint 16 and a left twist handle 12. The lower end of the L-shaped baffle 6 is formed with an avoidance groove for avoiding the guide rail 10, and the avoidance groove and the lower end of the L-shaped baffle 6 adapted to the guide rail 10 are fixed on the support seat plate 7. The bearing 4 is positioned and installed in the stepped hole on the vertical plate surface of the L-shaped baffle 6, and the pressure cover 11 fixed on the left side surface of the vertical plate of the L-shaped baffle 6 positions the bearing 4. The connecting joint 16 has a multi-step stepped sleeve structure, and the small diameter section at the left end of the connecting joint 16 is adapted to connect with the bearing 4 and passes through the pressure cover 11 and is threadedly fixed to the left twist handle 12. The left end of the composite pipe 9 is fixedly connected to the small-diameter section of the right end of the locking joint 3, and the locking nut 14 which is sleeved on the locking joint 3 and positioned with its large-diameter section is threadedly connected to the right end of the connecting joint 16, and under the tightening connection action of the locking nut 14, the left twist handle 12 and the locking joint 3 are tightened and sealed, wherein the distance between the opposite sides of the locking sleeve 3-2 of the locking nut 14 should be greater than the length of the threaded connection section of the locking nut 14 and the connecting joint 16, so that the locking nut 14 can be smoothly separated from the connecting joint 16 when the composite pipe 9 is disassembled; specifically, the right end face of the connecting joint 16 is equipped with a sealing ring that contacts and presses against the left end face of the locking joint 3.

[0033] The specific structure of the locking joint 3 is as follows: the locking joint 3 includes a core tube 3-1 and a locking sleeve 3-2. The outer contour of the core tube 3-1 is a three-stage stepped sleeve structure with a diameter decreasing from the outside to the inside. A positioning convex ring 3-4 is formed on the outer edge of the inner hole of the locking sleeve 3-2, and the positioning convex ring 3-4 is adapted to the positioning groove on the outer wall of the middle diameter section of the core tube 3-1. A plurality of tooth grooves 3-3 are evenly distributed on the inner hole wall of the locking sleeve 3-2 and the outer circumferential wall of the small diameter section of the core tube 3-1. The composite tube 9 is sleeved on the small diameter section of the core tube 3-1 and located between the tooth grooves 3-3 of the small diameter section of the core tube 3-1 and the tooth grooves 3-3 on the inner hole wall of the locking sleeve 3-2. The compression-deformed locking sleeve 3-2 is sealed and fixed to the core tube 3-1. On the other hand, the sealing connection between the end of the composite pipe 9 and the locking joint 3 is realized; specifically, the small diameter section of the core pipe 3-1 is formed with a plurality of sealing grooves 3-5 and the sealing ring adapted to be in the sealing groove 3-5 contacts and seals with the inner hole wall of the end of the composite pipe 9; in the above structure, the locking joint 3 composed of the core pipe 3-1 with a tooth groove 3-3 on the outer pipe wall and the locking sleeve 3-2 with a tooth groove 3-3 on the inner hole wall is adopted, which provides conditions for the rapid and reliable connection between the composite pipe 9 and the locking joint 3, and by providing a plurality of sealing grooves 3-5 with sealing rings installed on the outer circumferential wall of the small diameter section of the pipe core 3-1, the composite pipe 9 and the locking joint 3 are reliably sealed, the sealing requirements of the internal pressure test are met, and the internal pressure test is completed accurately and effectively;

[0034] The specific shapes of the left twist handle 12 and the right twist handle 2 are as follows: the left twist handle 12 and the right twist handle 2 are both conical sleeve structures with an outer end diameter larger than an inner end diameter, and the flanges at the pipe mouths of the two water injection pipes 1 are fixed to the end faces of the large diameter ends of the left twist handle 12 and the right twist handle 2 by multiple bolts, and are connected to the center holes inside the left twist handle 12 and the right twist handle 2.

[0035] The support seat plate 7 is a channel steel with its opening facing downward, and the channel steel is fixed on the base 8 .

[0036] In the internal pressure working condition, pressurized water is injected into the composite pipe 9 through the water injection pipe 1 by a water pump, so that the inside of the composite pipe 9 reaches the target pressure. During this process, the fixing bolts are in a loose state, so that the slider 5 is in a free adjustment state; in the bending working condition, downward pressure is applied to the right twist handles 2 at both ends to make the middle of the composite pipe 9 bend upward to achieve the required bending angle; in the twisting working condition, a twisting force is applied to the composite pipe 9 through the left twist handle 12 to twist the composite pipe 9 to the target angle; in the stretching working condition, horizontal tension is applied to the slider 5 when the fixing bolts are loosened, and the composite pipe 9 is stretched to the specified position; since the above-mentioned working conditions are separate and do not affect each other, if you want to achieve the required composite working condition, you can use the above-mentioned various working conditions to operate in sequence to obtain the composite working condition.

[0037] Specifically, such as Figure 3 and Figure 5 As shown, under internal pressure conditions, the composite tube 9 is installed in the middle of the experimental device with the fixing bolts loosened. A water pump is installed at the water inlet of the water inlet pipe 1 via a connecting pipe. As the pressure rises, the composite tube 9 contracts or relaxes, and the slider 5 slides along the guide rail 10 without causing additional damage to the composite tube 9. When testing the internal pressure of the composite tube 9, a pull-out force is generally applied on one side. For this experimental device, a horizontal pull-out force is applied to the right twist handle 2. When the applied internal pressure reaches the target pressure, the fixing bolts are tightened to secure the slider 5, facilitating measurement of the composite tube 9 at the end of the experiment.

[0038] like Figure 6 As shown, in the bending condition, the composite tube 9 is installed in the middle of the experimental device, the fixing bolts are in a loose state, and a downward force is applied to the right twist handle 2 to bend the composite tube 9 in the middle upward. When a large bending angle is required, the slider 5 is moved to the right. Figure 6 Sliding in the direction shown (i.e., leftward) shortens the distance between the two ends, and the composite tube 9 in the middle reaches a larger bending angle, so that the experimental device has a wider range of use. When the bending angle reaches the target angle, the fixing bolts threadedly connected to the top tightening guide rail 10 on the slider 5 are tightened to fix the slider 5, so that the data of the composite tube 9 at the end of the experiment can be measured.

[0039] like Figure 3 As shown, under the torsion working condition, the composite tube 9 is installed in the middle position of the experimental device, the fixing bolts threadedly connected to the tightening guide rail 10 on the slider 5 are loosened, the slider 5 is in a free sliding state, and a clockwise or counterclockwise torsional force is applied to the left torsion handle 12 to twist the composite tube 9 through the bearing 4. During the torsion of the composite tube 9, the entire composite tube 9 may shrink, and the slider 5 will slide. When the composite tube 9 is twisted to the target angle, the fixing bolts are tightened to fix the slider 5, so that the data of the composite tube 9 at the end of the experiment can be measured.

[0040] like Figure 5 As shown, under the tensile condition, the composite tube 9 is installed in the middle position of the experimental device, and the fixing bolts are loosened so that the slider 5 is in a free sliding state. A horizontal outward traction force is applied to the right twist handle 2. By pulling the slider 5, the composite tube 9 is also stretched. When the composite tube 9 is stretched to the specified position, the fixing bolts are tightened, and then data is sorted.

[0041] Under the composite working condition, the composite pipe 9 will be affected by more than one working condition load during its service. In this experimental device, it is only necessary to follow the above steps, operate the required working condition requirements, and operate the experimental process in sequence to complete the composite working condition.

[0042] Four high-strength bolts are installed on the base 8, allowing it to be installed in any experimental setting, making the experimental device more convenient. The movable experimental device also reduces experimental costs, eliminating the need to find specialized equipment such as pressure pumps and traction machines for the experimental device. The structure can be installed in a laboratory equipped with these specialized equipment to complete the experiment.

[0043] By installing the locking bolts 13, the axial position of the composite tube 9 can be ensured, improving the detection accuracy. Installing the support base plate 7 can provide the experimenter with a larger operating space and also increase the experimental range. The composite tube 9 can have a larger bending angle when bending. The composite tube 9 is installed in a manner that one end is fixed and the other end is free. This can ensure the stability of the test bench during the composite tube 9 experiment. Under the above experimental conditions, the experiment can be completed with one end free, reducing the operation process and saving costs. The track 10 and the slider 5 are used to move in the horizontal direction. Under the tensile condition, the stretched distance of the composite tube 9 can be measured more accurately.

[0044] This technical solution has a simple structure, novel design, is easy to maintain, easy to assemble and repair, low cost, and easy to promote and use. It can simulate a variety of environmental conditions and can complete experiments under various conditions more accurately and conveniently.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0046] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. The composite pipe experimental device based on various working conditions is characterized by: It comprises a base (8), a support base plate (7) is fixed to the upper end surface of the base (8), an L-shaped baffle (6) is fixed to the left end of the support base plate (7), and a rotation support device installed on the L-shaped baffle (6) and a position-adjustable support device installed on the support base plate (7) are coaxially arranged, and the outer ends of the rotation support device and the position-adjustable support device are both sealed and fixedly connected to a water injection pipe (1) communicating with the interior thereof; The rotating support device is sealed and fixedly connected to the left end of the composite pipe (9), and the position-adjustable support device is sealed and connected to the right end of the composite pipe (9). Pressurized water is injected into the interior of the composite pipe (9) through the water injection pipes (1) at both ends, or a torsional force is applied to the left end of the composite pipe (9) through the rotating support device, or a horizontal traction force is applied to the position-adjustable support device, or a downward pressure is applied to the position-adjustable support device, so as to realize the experiment of the internal pressure working condition, torsional working condition, tensile working condition or bending working condition of the composite pipe (9).

2. The composite pipe experimental device based on multiple working conditions according to claim 1 is characterized in that: The position-adjustable support device comprises a slider (5) and a right locking connection assembly, a guide rail (10) is fixed to the upper surface of the support base plate (7) along its length direction, and the slider (5) is adaptively connected to the guide rail (10), the right end of the composite pipe (9) is fixedly connected to the left end of the right locking connection assembly, and the right end of the right locking connection assembly is fixedly connected to the right water injection pipe (1), the slider (5) is axially positioned and connected to the right locking connection assembly, and when the slider (5) moves along the length direction of the guide rail (10), the position-adjustable support device is moved and adjusted along the length direction of the support base plate (7), and a fixing bolt with an inner end pressed against the guide rail (10) is provided on the slider (5).

3. The composite pipe experimental device based on multiple working conditions according to claim 2 is characterized in that: The right locking connection assembly comprises a locking joint (3), a locking screw sleeve (14) and a right twisting handle (2), wherein the locking joint (3) is in a T-shaped sleeve structure, the right end of the composite tube (9) is fixedly connected to the small diameter section of the left end of the locking joint (3), and the locking screw sleeve (14) sleeved on the locking joint (3) and positioned connected to the large diameter section thereof is threadedly connected to the left end of the right twisting handle (2), and under the tightening connection action of the locking screw sleeve (14), the right twisting handle (2) and the locking joint (3) are tightened and sealed; Two sliders (5) are symmetrically provided on both sides of the right end of the guide rail (10) and are adapted to be connected to the guide grooves on the corresponding sides. The sliders (5) are in an L-shaped stepped structure. The right twist handle (2) is located between the two sliders (5). The locking bolt (13) threadedly connected to the upper end of the vertical edge of the slider (5) is adapted to be in the positioning ring groove (15) on the outer circumferential wall of the right twist handle (2). The inner end of the locking bolt (13) is locked by rotating the locking bolt (13) to contact the bottom of the positioning ring groove (15), thereby locking and fixing the right end of the composite pipe (9).

4. The composite pipe experimental device based on multiple working conditions according to claim 3 is characterized in that: The left end face of the right twist handle (2) is provided with a sealing ring which contacts and seals with the right end face of the locking joint (3).

5. The composite pipe experimental device based on multiple working conditions according to claim 2 is characterized in that: The rotation support device includes a locking joint (3), a locking screw sleeve (14), a connecting joint (16) and a left twist handle (12), the lower end of the L-shaped baffle (6) is formed with a avoidance groove for avoiding the guide rail (10), and the lower end of the L-shaped baffle (6) adapted to the avoidance groove and the guide rail (10) is fixed on the support base plate (7), a bearing (4) is positioned and installed in the stepped hole on the vertical plate surface of the L-shaped baffle (6), and a pressure cover (11) fixed on the left side of the vertical plate of the L-shaped baffle (6) positions the bearing (4), and the connecting joint (16) is a multi-stage stepped sleeve structure, and the small diameter section of the left end of the connecting joint (16) is adapted to be connected with the bearing (4) and passes through the pressure cover (11) and is fixedly connected with the left twist handle (12) by thread. The left end of the composite pipe (9) is fixedly connected with the small diameter section of the right end of the locking joint (3), and the locking screw sleeve (14) which is sleeved on the locking joint (3) and positionedly connected with the large diameter section thereof is threadedly connected with the right end of the connecting joint (16), and the left twist handle (12) and the locking joint (3) are tightened and sealed under the tightening connection action of the locking screw sleeve (14).

6. The composite pipe experimental device based on multiple working conditions according to claim 5 is characterized in that: The right end face of the connecting joint (16) is provided with a sealing ring which contacts and presses against the left end face of the locking joint (3).

7. The experimental device for composite pipes based on multiple working conditions according to claim 3, 4, 5 or 6, characterized in that: The locking joint (3) comprises a core tube (3-1) and a locking sleeve (3-2). The outer contour of the core tube (3-1) is a three-stage stepped sleeve structure with a diameter decreasing from the outside to the inside. A positioning convex ring (3-4) is formed at the outer edge of the inner hole of the locking sleeve (3-2), and the positioning convex ring (3-4) is adapted to the positioning groove on the outer wall of the middle diameter section of the core tube (3-1). The inner hole wall of the locking sleeve (3-2) and the core tube (3-1) are connected to each other. -1) has a plurality of tooth grooves (3-3) uniformly distributed on the outer circumferential wall of the small diameter section, and the composite tube (9) sleeved on the small diameter section of the core tube (3-1) and located between the tooth grooves (3-3) of the small diameter section of the core tube (3-1) and the tooth grooves (3-3) on the inner hole wall of the locking sleeve (3-2) is sealed and fixed to the core tube (3-1) by the compression-deformed locking sleeve (3-2), thereby achieving a sealed fixed connection between the end of the composite tube (9) and the locking joint (3).

8. The composite pipe experimental device based on multiple working conditions according to claim 7 is characterized in that: The small diameter section of the core tube (3-1) is provided with a plurality of sealing grooves (3-5), and the sealing rings adapted to fit in the sealing grooves (3-5) are in contact and sealed with the inner hole wall of the end portion of the composite tube (9).

9. The composite pipe experimental device based on multiple working conditions according to claim 5, characterized in that: The left twist handle (12) and the right twist handle (2) are both tapered sleeve structures with an outer diameter larger than an inner diameter, and the flanges at the pipe openings of the two water injection pipes (1) are fixed to the large-diameter end surfaces of the left twist handle (12) and the right twist handle (2) respectively by a plurality of bolts, and are communicated with the center holes inside the left twist handle (12) and the right twist handle (2).

10. The composite pipe experimental device based on multiple working conditions according to claim 1, characterized in that: The support seat plate (7) is a channel steel with its opening facing downward, and the channel steel is fixed on the base (8).

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