Device and method for detecting free-state water pressure strength of composite pipe

Abstract

The invention relates to the technical field of material strength detection, in particular to a composite material pipe piece free state water pressure strength detection device which comprises a connecting sleeve assembly, a first sealing structure, a second sealing structure, a latex liner and an inner connector. The connecting sleeve assemblies are arranged at the two ends of the composite pipe part, the inner walls of the connecting sleeve assemblies are fixedly connected with the outer wall of the composite pipe part, the first sealing structure is arranged at one end of the composite pipe part, and the second sealing structure is arranged at the other end of the composite pipe part. The latex liner is arranged in the inner space of the composite pipe part, and the two ends of the latex liner abut against the first sealing structure and the second sealing structure correspondingly. The device does not interfere with the strength of any detection position of the composite material pipe piece, the strength value of the weak point of the composite material pipe piece is detected, the strength detection of the composite material pipe piece in the free state is achieved, and the design requirement of a product can be met.

Description

Technical Field

[0001] This invention relates to the field of material strength testing technology, specifically to a device and method for testing the free-state water pressure strength of composite pipe components. Background Technology

[0002] The existing hydrostatic strength testing device consists of a test rod, O-ring seals, plugs, retaining rings, and nuts. The left end of the test rod has a threaded interface for connecting to a hydrostatic press. The high-pressure connector of the hydrostatic press is screwed onto this thread. Water is injected into the hydrostatic sample through the water injection hole on the test rod to test the strength of the middle position of the composite material hydrostatic sample. It is widely used for hydrostatic strength testing of metal and composite material pipes. However, the existing device has a significant drawback: it can only test the radial strength of the composite material hydrostatic sample and cannot test the axial strength. Because the axial direction is connected and compressed by the test rod, the strength of the test rod is much greater than the axial strength of the sample. During the burst test, the sample can only burst radially, and the axial fracture strength of the sample cannot be tested through axial failure.

[0003] With the increasing application of composite material pipes in the military industry, product designs only specify chamber pressure requirements, while in actual applications, products often burst in the weakest direction. Existing devices can only test radial strength, failing to determine if axial strength meets standards. This can lead to breakage due to insufficient axial strength during use, causing significant quality incidents.

[0004] Therefore, there is an urgent need for a device to test the free-state water pressure strength of composite material pipe components to solve the above problems. Summary of the Invention

[0005] To achieve the above objectives, this application employs the following technical solution: A free-state water pressure strength testing device for composite material pipe fittings includes a connecting sleeve assembly, a first sealing structure, a second sealing structure, a latex liner, and an inner connector. The connecting sleeve assembly is disposed at both ends of the composite material pipe fitting, and the inner wall of the connecting sleeve assembly is fixedly connected to the outer wall of the composite material pipe fitting. The first sealing structure is disposed at one end of the composite material pipe fitting, and the second sealing structure is disposed at the other end of the composite material pipe fitting. The first sealing structure and the second sealing structure are respectively disposed between the composite material pipe fitting and the connecting sleeve assembly. Furthermore, the latex liner is disposed within the internal space of the composite material tubular component, and its two ends abut against the first sealing structure and the second sealing structure, respectively. The latex liner has a semi-open structure, with the end of the latex liner abutting against the first sealing structure being closed, and the end of the latex liner abutting against the second sealing structure being an open structure and connected to the inner connector. The inner connector has a hollow structure and is used to inject water and apply pressure into the latex liner.

[0006] Furthermore, the connecting sleeve assembly includes a front connecting sleeve and a rear connecting sleeve. The front connecting sleeve is connected to the right end of the composite material tube, and the inner hole of the front connecting sleeve is a conical hole that is fitted and bonded to the outer conical surface of the composite material tube. The rear connecting sleeve is connected to the left end of the composite material tube, and the inner hole of the rear connecting sleeve is a conical hole that is fitted and bonded to the outer conical surface of the composite material tube.

[0007] Furthermore, the first sealing structure includes a plug for sealing, one end of which abuts against the rear connecting sleeve, and the other end is connected to the latex liner, with the end connected to the latex liner being curved and protruding toward the rear connecting sleeve.

[0008] Furthermore, the second sealing structure includes a right plug, a large washer, and a nut. The outer wall of the right plug is threadedly connected to the inner wall of the front connecting sleeve, and the internal space matches the outer contour of the latex bladder when it is in an expanded state. Furthermore, the second sealing structure is connected to the inner connector via a large washer and a nut. The latex liner is fitted onto the inner connector. Along the axial direction of the composite material pipe, from left to right, the large washer and the nut are sequentially threaded onto the inner connector.

[0009] Furthermore, the first sealing structure also includes a rubber gasket, which is disposed between the plug and the latex liner.

[0010] Furthermore, the latex liner includes a bottom, a middle section, and a head. The bottom has an arc-shaped structure and abuts against the first sealing structure. The middle section has a regular rectangular cross-section. The head is conical and smoothly transitions to the middle section.

[0011] A method for testing the free-state hydrostatic strength of composite pipe components includes the following steps: Step 100: Adhere the rear connecting sleeve to the composite material tubular component and place it vertically; Step 200: Adhere the front connecting sleeve to the composite material tube and place it horizontally. After a preset time interval, rotate the composite material tube 180°. Step 300: Overlap and bond the sides of the latex liner, with an overlap width of 25mm; Step 400: Stand the rear connecting sleeve upright with the concave side of the plug facing upward, insert the composite material tube, then insert the rubber gasket and make it abut against the plug, insert the latex liner into the composite material tube, and fill the latex liner with water to the bottom and middle. Step 500: Fit the head of the latex liner onto the inner connector, install the right plug in the front connecting sleeve, and install the large washer and nut in sequence; Step 600: Install the water injection connector of the water pressure pump onto the inner connector, inject water and pressurize it to complete the strength test.

[0012] Compared with existing technologies, the beneficial effects of this application are as follows: The testing device in this application can test composite material tubular components in a free state without applying axial constraints. It can simultaneously and accurately detect radial and axial strength, accurately locate weak points, and solve the defect of existing technologies that can only detect radial strength, ensuring that the test results are fully matched with the actual use scenario of the product. By accurately detecting axial and radial strength, safety and quality accidents caused by product breakage due to insufficient strength in actual use are avoided from the root. Metal parts such as connecting sleeves can be reused multiple times, and consumables such as latex liner have low costs, effectively controlling the overall cost of the test. Attached Figure Description

[0013] Appendix Figure 1 This is a schematic diagram of the overall structure of the detection device in this application; Appendix Figure 2 This is a schematic diagram of the latex bladder of the detection device in this application; Appendix Figure 3 This is a schematic diagram of the connecting sleeve assembly of the detection device in this application; Appendix Figure 4 This is a schematic diagram of the right plug of the detection device in this application.

[0014] The following figures are labeled as follows: 10. Connecting sleeve assembly; 1. Rear connecting sleeve; 5. Front connecting sleeve; 20. First sealing structure; 2. Plug; 3. Rubber gasket; 30. Second sealing structure; 6. Right plug; 7. Large washer; 8. Nut; 4. Latex liner; 41. Bottom; 42. Middle part; 43. Head; 9. Inner connector. Detailed Implementation

[0015] The present application will be further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this application, those skilled in the art can make various alterations or modifications to this application, and these equivalent forms also fall within the scope defined by this application.

[0016] A free-state water pressure strength testing device for composite material pipe fittings includes a connecting sleeve assembly 10, a first sealing structure 20, a second sealing structure 30, a latex liner 4, and an inner connector 9. The connecting sleeve assembly 10 is disposed at both ends of the composite material pipe fitting, and the inner wall of the connecting sleeve assembly 10 is fixedly connected to the outer wall of the composite material pipe fitting. The first sealing structure 20 is disposed at one end of the composite material pipe fitting, and the second sealing structure 30 is disposed at the other end of the composite material pipe fitting. The first sealing structure 20 and the second sealing structure 30 are respectively disposed between the composite material pipe fitting and the connecting sleeve assembly 10. The latex liner 4 is disposed in the internal space of the composite material tube and its two ends abut against the first sealing structure 20 and the second sealing structure 30 respectively. The latex liner 4 is a semi-open structure. The end of the latex liner 4 that abuts against the first sealing structure 20 is closed, and the end of the latex liner 4 that abuts against the second sealing structure 30 is an open structure and is connected to the inner connector 9. The inner connector 9 is a hollow structure and is used to inject water and apply pressure into the latex liner 4.

[0017] The connecting sleeve assembly 10 includes a front connecting sleeve 5 and a rear connecting sleeve 1. The front connecting sleeve 5 is connected to the right end of the composite material tubular component. The inner hole of the front connecting sleeve 5 is a tapered hole and is bonded to the outer conical surface of the composite material tubular component. The rear connecting sleeve 1 is connected to the left end of the composite material tubular component. The inner hole of the rear connecting sleeve 1 is also a tapered hole and is bonded to the outer conical surface of the composite material tubular component. The tapered hole design allows for automatic alignment, reducing fit deviations and ensuring a uniform adhesive layer thickness between the connecting sleeve assembly 10 and the composite material tubular component. This significantly increases the bonding strength and ensures that the connecting sleeve assembly 10 does not detach from the composite material tubular component under high-pressure testing conditions, providing a stable structural foundation for the entire testing device.

[0018] The design of the front connecting sleeve 5 and the rear connecting sleeve 1 described in this application connects to both ends of the composite material tube respectively, without penetrating into the tube of the composite material tube or applying axial constraints. This allows the composite material tube to be in a free state during the testing process, and it can be freely deformed in both the axial and radial directions. This solves the defect in the prior art that the axial strength cannot be detected due to axial constraints, and can accurately detect the strength of the weak points of the tube.

[0019] The first sealing structure 20 includes a plug 2 for sealing. One end of the plug 2 abuts against the rear connecting sleeve 1, and the other end is connected to the latex liner 4. The end connected to the latex liner 4 is curved and protrudes towards the rear connecting sleeve 1. The protruding curved surface design can tightly fit the arc-shaped structure of the bottom 41 of the latex liner 4, achieving a preliminary seal. It also includes a rubber gasket 3, which is disposed between the plug 2 and the latex liner 4. The rubber gasket 3 can fill the tiny gap between the plug 2 and the latex liner 4, protecting the latex liner 4 and preventing it from being squeezed into the gap and ruptured under high pressure, thus ensuring the reliability of the seal.

[0020] The second sealing structure 30 includes a right plug 6, a large washer 7, and a nut 8. The outer wall of the right plug 6 is threadedly connected to the inner wall of the front connecting sleeve 5, and its internal space matches the outer contour of the latex liner 4 when it is in an expanded state. The threaded connection enables the fixation and sealing of the right end of the latex liner 4. The matching design of the internal space of the composite material tubular component provides suitable accommodation space when the latex liner 4 expands, avoiding excessive compression of the latex liner 4 and ensuring the shape stability of the latex liner 4 under high pressure. The second sealing structure 30 is connected to the inner connector 9 through the large washer 7 and the nut 8. The latex liner 4 is fitted onto the inner connector 9. Along the axial direction of the composite material tubular component, from left to right, the large washer 7 and the nut 8 are sequentially threadedly connected to the inner connector 9, which can further enhance the sealing effect, prevent high-pressure water from leaking from the connection between the latex liner 4 and the inner connector 9, and ensure the smooth progress of the water injection and pressurization process.

[0021] The latex liner 4 includes a bottom 41, a middle section 42, and a head 43. The bottom 41 has an arc-shaped structure and abuts against the first sealing structure 20, achieving a good seal. Simultaneously, the arc-shaped structure can evenly transmit pressure under high pressure, avoiding localized stress concentration that could lead to rupture. The middle section 42 has a regular rectangular cross-section, providing a large volume for the detection device and sufficient water to evenly pressurize the interior of the composite material tubular component. The head 43 is conical and smoothly transitions to the middle section 42.

[0022] A method for testing the free-state water pressure strength of composite pipe components includes the following steps: Step 100: Adhere the rear connecting sleeve 1 to the composite material tubular component and place it vertically; Step 200: Adhere the front connecting sleeve 5 to the composite material tube and place it horizontally. After a preset time interval, rotate the composite material tube 180°. Step 300: Overlap and bond the side edges of the latex liner 4, with an overlap width of 25mm; Step 400: Stand the rear connecting sleeve 1 upright with the end facing down, insert the composite material tube with the concave surface of the plug 2 facing up, then insert the rubber gasket 3 and make it abut against the plug 2, insert the latex liner 4 into the composite material tube, and fill the latex liner 4 with water to the bottom 41 and middle part 42. Step 500: Fit the head 43 of the latex liner 4 onto the inner connector 9, install the right plug 6 in the front connecting sleeve 5, and install the large washer 7 and nut 8 in sequence; Step 600: Install the water injection connector of the water pressure pump onto the inner connector 9, inject water and pressurize it to complete the strength test.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A composite material pipe class free state water pressure strength detection device, characterized in that: it comprises a connecting sleeve assembly (10), a first sealing structure (20), a second sealing structure (30), a latex bladder (4) and an inner joint (9), the connecting sleeve assembly (10) is arranged at both ends of the composite material pipe class and the inner wall of the connecting sleeve assembly (10) is fixedly connected with the outer wall of the composite material pipe class, the first sealing structure (20) is arranged at one end of the composite material pipe class, the second sealing structure (30) is arranged at the other end of the composite material pipe class, and the first sealing structure (20) and the second sealing structure (30) are arranged between the composite material pipe class and the connecting sleeve assembly (10) respectively; the latex bladder (4) is arranged in the internal space of the composite material pipe class and abuts against the first sealing structure (20) and the second sealing structure (30) at both ends respectively, the latex bladder (4) is a semi-open structure, one end of the latex bladder (4) abutting against the first sealing structure (20) is closed, and the other end of the latex bladder (4) abutting against the second sealing structure (30) is an open structure and is connected with the inner joint (9), the inner joint (9) is a hollow structure and is used for injecting water into the latex bladder (4) to apply pressure.

2. The composite material pipe class free state water pressure strength detection device according to claim 1, characterized in that: the connecting sleeve assembly (10) comprises a front connecting sleeve (5) and a rear connecting sleeve (1), the front connecting sleeve (5) is connected with the right end of the composite material pipe class, the inner hole of the front connecting sleeve (5) is a taper hole and is bonded with the outer conical surface of the composite material pipe class, and the rear connecting sleeve (1) is connected with the left end of the composite material pipe class, the inner hole of the rear connecting sleeve (1) is a taper hole and is bonded with the outer conical surface of the composite material pipe class.

3. The composite material pipe class free state water pressure strength detection device according to claim 2, characterized in that: the first sealing structure (20) comprises a plug cover (2) for sealing, one end of the plug cover (2) abuts against the rear connecting sleeve (1), the other end of the plug cover (2) is connected with the latex bladder (4), and the end connected with the latex bladder (4) is a curved surface and protrudes towards the direction of the rear connecting sleeve (1).

4. The composite material pipe class free state water pressure strength detection device according to claim 2, characterized in that: the second sealing structure (30) comprises a right plug (6), a large gasket (7) and a nut (8), the outer wall of the right plug (6) is threadedly connected with the inner wall of the front connecting sleeve (5) and the internal space thereof matches the outer contour of the latex bladder (4) in the inflation state; the second sealing structure (30) is connected with the inner joint (9) through the large gasket (7) and the nut (8), the latex bladder (4) is sleeved with the inner joint (9), and from left to right along the axial direction of the composite material pipe class, the large gasket (7) and the nut (8) are sequentially threadedly connected with the inner joint (9). ​ ​ ​ ​ 5. The free state water pressure strength detection device for composite material pipe parts according to claim 3, characterized in that: The first sealing structure (20) further comprises a rubber pad (3) arranged between the plug cover (2) and the latex bladder (4).

6. The free state water pressure strength detection device for composite material pipe parts according to claim 1, characterized in that: The latex bladder (4) comprises a bottom portion (41), a middle portion (42) and a head portion (43), the bottom portion (41) is an arc structure and abuts against the first sealing structure (20), the middle portion (42) has a regular rectangular cross section, and the head portion (43) is tapered and smoothly transitions to the middle portion (42).

7. A free state water pressure strength detection method for composite material pipe parts, based on the free state water pressure strength detection device for composite material pipe parts according to any one of claims 1-6, characterized in that: The method comprises the following steps: Step 100, bonding the rear connecting sleeve (1) to the composite material pipe part and vertically placing it; Step 200, bonding the front connecting sleeve (5) to the composite material pipe part and horizontally placing it, after a preset interval, rotating the composite material pipe part by 180°; Step 300, bonding the side edges of the latex bladder (4) with an overlap of 25 mm; Step 400, punching down the end of the rear connecting sleeve (1) to stand up, placing the plug cover (2) with the concave surface upward into the composite material pipe part, then placing the rubber pad (3) into the plug cover (2) and abutting it, placing the latex bladder (4) into the composite material pipe part, and injecting water to the bottom portion (41) and the middle portion (42) of the latex bladder (4); Step 500, placing the head portion (43) of the latex bladder (4) on the inner joint (9), installing the right plug (6) in the front connecting sleeve (5), and sequentially installing the large gasket (7) and the nut (8); Step 600, installing the water injection joint of the water pressure pump on the inner joint (9), injecting water and pressurizing, and completing the strength detection.

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