Glass steel sand pipe water pressure testing device and method

Abstract

The application discloses a kind of glass steel sand-encased pipe water pressure testing device and method, it is related to pipeline detection equipment technical field, including two groups of end support plate, movable support plate, drive arrangement, plugging plate and water injection pipe, plugging ring plate is set on plugging plate, hollow ring plate and elastic sealing pad are set in plugging ring plate inside;Water injection pipe is provided with injection pressure device, injection pressure device can transport pressure water to the inside of elastic sealing pad after the internal pressure of the pipeline to be measured reaches preset value, to drive elastic sealing pad expansion and sealing cooperation with the inner wall of the pipeline to be measured;The device further includes flexible protective net and unfolding device set to the periphery of the pipeline to be measured, unfolding device is communicated with injection pressure device, to drive flexible protective net to unfold and form peripheral protection structure when pipe explosion test is carried out.The application can realize the automatic sealing of the pipeline to be measured at both ends by test pressure, and automatically unfold protective net during pipe explosion test, so as to improve the sealing adaptability and test safety of different specifications of pipeline.

Description

Technical Field

[0001] This invention relates to the field of pipeline testing equipment technology, and in particular to a water pressure testing device and method for fiberglass reinforced plastic (FRP) sand-filled pipes. Background Technology

[0002] Fiberglass reinforced plastic (FRP) pipes, due to their advantages such as corrosion resistance, light weight, and high strength, are widely used in municipal water supply, sewage discharge, and chemical transportation. After the FRP pipes are manufactured, they typically undergo water pressure sealing tests and pressure resistance tests to check their sealing performance and pressure-bearing capacity.

[0003] In the prior art, for example, patent CN205749143U, a water pressure testing device for fiberglass pipes;

[0004] A water pressure test structure that uses front and rear end caps and sealing rings to achieve pipe sealing is disclosed. This solution can reduce the amount of water used for pressure testing and improve the venting effect.

[0005] However, most of these testing devices still use a fixed rigid sealing structure, which has poor sealing adaptability when facing fiberglass reinforced plastic (FRP) pipes of different specifications. At the same time, during high-pressure testing or pipe burst testing, existing devices usually lack an automatic protection structure that can be linked to the test pressure. When the pipe under test bursts, it is easy to generate fragments that fly around, thus posing a significant safety hazard. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide a water pressure testing device and method for fiberglass reinforced plastic (FRP) pipes with sand filling, in order to solve the problems that existing FRP pipe water pressure testing equipment has insufficient end sealing adaptability when conducting high-pressure tests on pipes of different specifications, and lacks a protective structure linked to the test pressure during pipe burst testing, which easily leads to safety hazards such as flying fragments.

[0007] To achieve the above objectives, this invention provides a water pressure testing device for fiberglass reinforced plastic (FRP) sand-filled pipes, comprising two sets of end support plates. A sealing plate is fixedly installed on the left end support plate, and a movable support plate is installed on the right end support plate. Another set of sealing plates, corresponding to the left sealing plate, is installed on the movable support plate. A driving device for moving the movable support plate is provided between the two sets of end support plates. The device is characterized in that: a sealing ring plate is provided on the adjacent side of each sealing plate; a hollow ring plate is provided inside the sealing ring plate; an elastic sealing gasket communicating with the hollow ring plate is provided on the outer side of the hollow ring plate; a water injection pipe for injecting test water into the pipe under test is provided at the center of the sealing ring plate; a pressure injection device for delivering pressurized water into the elastic sealing gasket is provided on the water injection pipe; a flexible protective net is provided around the pipe under test; the flexible protective net is connected to an unfolding device for driving its unfolding; and the unfolding device is connected to the pressure injection device.

[0008] Furthermore, the driving device includes two sets of rotating rods rotatably disposed between two sets of end support plates. The two sets of rotating rods are arranged in parallel. A drive motor for driving the two sets of rotating rods to rotate synchronously is provided on the left end support plate. A lug is provided on the top of the movable support plate, and the lug is threadedly connected to the rotating rod.

[0009] Furthermore, the flexible protective net has a square structure and is fitted around the outer perimeter of the pipe to be tested. A first plate and a second plate are connected to both sides of one end of the flexible protective net, and the four corners of the other end of the flexible protective net are connected to the end support plate on the left side. Support rods are fixedly installed on adjacent sides of the two sets of end support plates. The first plate is slidably mounted on the support rods, and the second plate is slidably mounted on the rotating rods. The unfolding device includes a hydraulic drive unit located outside the end support plates. An end block is provided at the drive end of the hydraulic drive unit, and the end block is fixedly connected to the first plate to drive the flexible protective net to unfold via the first plate. A second safety valve is provided between the unfolding device and the injection device.

[0010] Furthermore, the hydraulic drive unit includes a hollow rod disposed on the outside of the left end support plate. Two sets of outer rods are fixedly disposed on the right side of the hollow rod. The two sets of outer rods pass through the left end support plate and are fixedly connected to the left end support plate. An inner rod is slidably disposed inside the outer rod. The inner rod is connected to the end block. A piston-type sliding seal structure is formed between the outer rod and the inner rod, and the interior of the outer rod is connected to the interior of the hollow rod. A return spring is disposed inside the outer rod. One end of the return spring is connected to the inner wall of the outer rod, and the other end is connected to the inner rod, so as to drive the inner rod to return to its original position after the hydraulic pressure is released.

[0011] Furthermore, the pressure injection device includes a T-type three-way valve installed on the water injection pipe. The left and right ends of the T-type three-way valve are respectively connected to the water injection pipe. The bottom end of the T-type three-way valve is connected to the water inlet end of the first safety valve. The water outlet end of the first safety valve is connected to a first connecting pipe. The other end of the first connecting pipe is connected to the inside of the sealing ring plate.

[0012] Furthermore, pressure sensors are respectively installed on the water injection pipe and the first connecting pipe. The pressure sensors are electrically connected to the external control system. The first safety valve and the second safety valve are both electrically connected to the external control system. The external control system is used to control the opening or closing of the first safety valve and the second safety valve according to the pressure signal detected by the pressure sensor.

[0013] Furthermore, both the first safety valve and the second safety valve adopt an electrically controlled safety valve structure. Both the first safety valve and the second safety valve are equipped with an electromagnetic drive component, which is used to receive control signals from an external control system to drive the valve core to move.

[0014] Furthermore, the sealing ring plate has a communicating cavity inside, which communicates with the interior of the hollow ring plate. The outer ring wall of the hollow ring plate has a communicating hole that communicates with the interior of the elastic sealing gasket. The sealing ring plate has multiple sets of hollow ring plates inside, which are arranged concentrically at intervals.

[0015] Furthermore, the upper half of the inner end face of the sealing ring plate is provided with an exhaust channel, which is used to discharge the air inside the pipe to be tested during the initial water injection.

[0016] A method for testing the water pressure of a fiberglass reinforced plastic (FRP) sand-filled pipe includes the following steps:

[0017] S1. Adjust the distance between the two sets of sealing plates and seal both ends of the pipe to be tested;

[0018] S2. Inject water into the pipe to be tested through the water injection pipe;

[0019] S3. After the internal pressure of the pipeline to be tested reaches the preset value, pressurized water is delivered into the elastic sealing gasket through the injection device to drive the elastic sealing gasket to expand and form a seal.

[0020] S4. During the pipe burst test, the flexible protective net is deployed by the deployment device;

[0021] S5. Continue to increase the internal pressure of the pipe to be tested in order to conduct the test.

[0022] This invention, by setting up a sealing ring plate, a hollow ring plate, and an elastic sealing gasket, and cooperating with a pressure injection device to deliver pressurized water into the elastic sealing gasket, can use the water pressure generated during the test to drive the elastic sealing gasket to automatically expand, thereby achieving adaptive sealing for fiberglass reinforced plastic (FRP) pipes of different specifications, improving the sealing adaptability and test stability of the device. At the same time, by setting up an unfolding device and a flexible protective net connected to the pressure injection device, the flexible protective net can be automatically unfolded by pressurized water during the pipe burst test, thereby effectively blocking the fragments when the pipe under test bursts, reducing the risk of fragment scattering, and improving the safety of the test process. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall first-view perspective structure of an embodiment of the present invention;

[0025] Figure 2This is a schematic diagram of the overall second-view structure of an embodiment of the present invention;

[0026] Figure 3 Embodiments of the present invention Figure 2 A magnified structural diagram of A in the middle;

[0027] Figure 4 This is a schematic diagram of the left end support plate structure according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the internal structure of the left end support plate according to an embodiment of the present invention;

[0029] Figure 6 This is a first-view structural schematic diagram of the injection device according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the front cross-sectional structure of the unfolding device according to an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the main sectional view of the sealing ring plate according to an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of the injection device from a second perspective according to an embodiment of the present invention;

[0033] Figure 10 Embodiments of the present invention Figure 9 A magnified structural diagram of B in the diagram;

[0034] Figure 11 This is a side view of the sealing ring plate structure according to an embodiment of the present invention.

[0035] The diagram is marked as follows:

[0036] 1. End support plate; 11. Sealing plate; 12. Water injection pipe; 13. Sealing ring plate; 131. Hollow ring plate; 132. Elastic sealing gasket; 133. Connecting cavity; 134. Connecting hole; 135. Exhaust duct; 14. Support rod; 2. Movable support plate; 21. Hanging lug; 3. Drive device; 31. Drive motor; 32. Rotating rod; 4. Lifting device; 41. First electric slide rail; 42. Support column; 43. Second electric... 44. Slide rail; 45. Hydraulic rod; 56. Hook; 57. Pressurization device; 58. T-type three-way valve; 59. First safety valve; 50. First connecting pipe; 60. Protective net mounting plate; 61. First plate; 62. Second plate; 71. Deployment device; 72. Hydraulic drive unit; 73. Hollow rod; 74. Outer rod; 75. Inner rod; 76. Return spring; 77. Spring frame; 78. End block; 79. Second safety valve. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0038] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 As shown, this embodiment provides a water pressure testing device for fiberglass reinforced plastic (FRP) pipes, including two sets of end support plates 1. The two sets of end support plates 1 are spaced apart and serve as an overall load-bearing support structure. A sealing plate 11 is fixedly installed inside the left end support plate 1, and a movable support plate 2 is installed on the right end support plate 1 near the left end support plate 1. The movable support plate 2 is also equipped with a sealing plate 11. The two sets of sealing plates 11 are arranged opposite to each other and are used to limit and seal both ends of the FRP pipe to be tested.

[0040] A driving device 3 is provided between the two sets of end support plates 1. The driving device 3 is used to drive the movable support plate 2 to move along the axial direction between the two sets of end support plates 1 to accommodate pipes of different lengths. Specifically, the driving device 3 includes two sets of rotating rods 32 rotatably disposed between the two sets of end support plates 1. The two sets of rotating rods 32 are arranged in parallel. A drive motor 31 for driving the rotating rods 32 to rotate synchronously is provided on the left end support plate 1. Two sets of hanging ears 21 are provided on the top of the movable support plate 2, and the two sets of hanging ears 21 are threadedly connected to the corresponding rotating rods 32. When the drive motor 31 is working, it can drive the two sets of rotating rods 32 to rotate synchronously, thereby moving the movable support plate 2 along the axial direction of the rotating rods 32 to adjust the distance between the two sets of sealing plates 11.

[0041] Two sets of sealing plates 11 are respectively fixedly installed on one side of adjacent sides with sealing ring plates 13. The sealing ring plate 13 is a hollow ring structure with one side open, and its open end faces the inside of the pipe to be tested. A water injection pipe 12 is fixedly installed in the center of the inside of the sealing ring plate 13. The water injection pipe 12 is used to inject test water into the inside of the pipe to be tested. The water injection pipe 12 is connected to an external water supply device.

[0042] Preferably, the right end support plate 1 is provided with a sliding hole for the water injection pipe 12 to pass through, so that the water injection pipe 12 can move relative to the end support plate 1 with the movable support plate 2.

[0043] In order to achieve automatic sealing at both ends of the pipe under test, at least one set of hollow ring plates 131 are concentrically arranged inside the sealing ring plate 13. The hollow ring plates 131 are connected to the inside of the sealing ring plate 13. An elastic sealing gasket 132 is provided on the outer ring wall of the hollow ring plate 131. The elastic sealing gasket 132 is made of rubber material with elastic deformation capability. The inside of the elastic sealing gasket 132 is connected to the hollow ring plate 131.

[0044] Preferably, in this embodiment, multiple sets of hollow ring plates 131 are provided, which are arranged concentrically at intervals to meet the sealing requirements of different pipe diameters. The outer diameter of the elastic sealing gasket 132 in its natural state is larger than that of the hollow ring plate 131, and it can form a pre-contact seal with the inner wall of the pipe under test when the sealing ring plate 13 abuts against the end face of the pipe under test. The inner wall end face of the sealing ring plate 13 can seal the end of the pipe opening, thereby reducing the leakage of test water in the initial stage of water injection, so as to facilitate the establishment of initial pressure inside the pipe under test. When pressurized water enters the interior of the elastic sealing gasket 132, the elastic sealing gasket 132 further expands outward and presses against the inner wall of the pipe under test to improve the sealing effect.

[0045] The sealing ring plate 13 has a connecting cavity 133 inside, which is connected to the interior of each set of hollow ring plates 131. A connecting hole 134 is provided on the outer ring wall of the hollow ring plate 131 to communicate with the interior of the elastic sealing gasket 132, so that the pressurized water entering the sealing ring plate 13 can enter the interior of the elastic sealing gasket 132 through the connecting cavity 133 and the connecting hole 134, thereby driving the elastic sealing gasket 132 to expand outward.

[0046] A pressure injection device 5 is installed on the water injection pipe 12. The pressure injection device 5 can automatically deliver pressurized water into the elastic sealing gasket 132 after the internal pressure of the pipe under test reaches a preset value, so as to achieve automatic sealing at both ends of the pipe under test. Specifically, the pressure injection device 5 includes a T-type three-way valve 51. The left and right ends of the T-type three-way valve 51 are respectively connected to the water injection pipe 12, and its bottom end is connected to a first safety valve 52. The outlet end of the first safety valve 52 is connected to a first connecting pipe 53, and the other end of the first connecting pipe 53 is connected to the inside of the sealing ring plate 13.

[0047] In this embodiment, the first safety valve 52 preferably adopts an electrically controlled safety valve structure. When the internal pressure of the water injection pipe 12 reaches the preset pressure value of the first safety valve 52, the first safety valve 52 automatically opens, making the T-type three-way valve 51 connected to the first connecting pipe 53, thereby allowing pressurized water to enter the sealing ring plate 13 and further enter the elastic sealing gasket 132 to achieve automatic sealing.

[0048] To facilitate the removal of air from the pipe under test, an exhaust channel 135 is vertically formed on the upper half of the inner end face of the sealing ring plate 13. The exhaust channel 135 is used to remove air from the pipe under test during the initial water injection phase, preventing residual air from affecting the test accuracy.

[0049] To improve safety during pipe burst testing, this embodiment also includes four sets of protective net mounting plates 6. The four sets of protective net mounting plates 6 are respectively positioned at the four corners of the pipe under test. Two sets of support rods 14 are fixed to the adjacent sides of the two sets of end support plates 1. A first plate 61 is slidably mounted on each set of support rods 14, and a second plate 62 corresponding to the first plate 61 is slidably mounted on the rotating rod 32. The flexible protective net has a square structure and is fitted around the outer perimeter of the pipe under test. One end of the flexible protective net is connected to the four sets of protective net mounting plates 6 at its four corners, and the other end is connected to the end support plates 1 at its four corners.

[0050] An unfolding device 7 for driving the protective net mounting plate 6 to move is provided on the end support plate 1. The unfolding device 7 is connected to the first connecting pipe 53 and is used to automatically unfold the flexible protective net in the pipe burst test mode. Specifically, the unfolding device 7 includes a hydraulic drive unit 71, and the drive end of the hydraulic drive unit 71 is provided with an end block 72, which is fixedly connected to the first plate 61.

[0051] The hydraulic drive unit 71 includes a hollow rod 711 disposed on the left side of the left end support plate 1. Two sets of outer rods 712 are fixedly disposed on the right side of the hollow rod 711. The two sets of outer rods 712 pass through the left end support plate 1 and are fixedly connected to it. An inner rod 713 is slidably disposed inside the outer rod 712. A piston-type sliding seal structure is formed between the outer rod 712 and the inner rod 713. The interior of the outer rod 712 is in communication with the interior of the hollow rod 711.

[0052] A return spring 714 is installed inside the outer rod 712. An inner ring-shaped spring bracket 7141 is fixed inside the return spring 714. The spring bracket 7141 is connected to the end of the inner rod 713, thus enabling the inner rod 713 to return to its original position after hydraulic release. Additionally, a solenoid valve is located at the bottom of the hollow rod 711. After the test, the solenoid valve opens, allowing the liquid inside the hollow rod 711 and the elastic sealing gasket 132 to be discharged outwards.

[0053] To facilitate the hoisting of the pipeline under test, a hoisting device 4 is installed on the top of the end support plate 1. The hoisting device 4 includes a first electric slide rail 41 fixed to the top of the end support plate 1, a support column 42 on the top of the first electric slide rail 41, a second electric slide rail 43 fixedly installed on the top of the support column 42, a hydraulic rod 44 at the bottom of the second electric slide rail 43, and a hook 45 fixedly installed at the bottom of the hydraulic rod 44. The first electric slide rail 41 can drive the hook 45 to move along the Y-axis, the second electric slide rail 43 can drive the hook 45 to move along the X-axis, and the hydraulic rod 44 can drive the hook 45 to rise and fall vertically, thereby realizing multi-directional hoisting and adjustment of the pipeline under test.

[0054] Pressure sensors are installed on the water injection pipe 12 and the first connecting pipe 53 respectively to detect the water pressure inside the water injection pipe 12 and the first connecting pipe 53 in real time.

[0055] The pressure sensor is electrically connected to an external control system, which is preferably a PLC controller.

[0056] Both the first safety valve 52 and the second safety valve 73 adopt an electrically controlled safety valve structure and are electrically connected to the external control system respectively.

[0057] The external control system 9 can control the opening or closing of the first safety valve 52 and the second safety valve 73 based on the pressure signal detected by the pressure sensor 8.

[0058] Preferably, both the first safety valve 52 and the second safety valve 73 are equipped with electromagnetic drive components, which are used to receive control signals from the external control system to drive the valve core to move.

[0059] A method for testing the water pressure of a fiberglass reinforced plastic (FRP) sand-filled pipe includes the following steps:

[0060] S1. Adjust the distance between the two sets of sealing plates 11 and seal both ends of the pipe to be tested;

[0061] S2. Inject water into the pipe to be tested through water injection pipe 12;

[0062] S3. After the internal pressure of the pipeline to be tested reaches the preset value, pressurized water is delivered into the elastic sealing gasket 132 through the injection device 5 to drive the elastic sealing gasket 132 to expand and form a seal.

[0063] S4. During the pipe burst test, the flexible protective net is deployed by the deployment device 7.

[0064] S5. Continue to increase the internal pressure of the pipe under test to conduct the test.

[0065] The working process of this invention is as follows:

[0066] First, the fiberglass reinforced plastic (FRP) pipe to be tested is hoisted between the two sets of sealing plates 11 using hoisting 4. Then, the drive motor 31 is started, and the drive motor 31 drives the two sets of rotating rods 32 to rotate synchronously, causing the movable support plate 2 to move to the left until the inner end faces of the sealing ring plates 13 on both sides abut against the two ends of the pipe to be tested.

[0067] During the sealing test, an external water supply device continuously injects water into the pipe under test through the water injection pipe 12. In the initial stage of water injection, the air inside the pipe under test is discharged to the outside through the exhaust duct 135. As the water gradually fills the pipe under test, the pressure inside the water injection pipe 12 gradually increases.

[0068] When the internal pressure of the water injection pipe 12 reaches the opening pressure of the first safety valve 52, the first safety valve 52 opens, allowing pressurized water to enter the sealing ring plate 13 through the first connecting pipe 53, and then enter the elastic sealing gasket 132 through the connecting cavity 133 and the connecting hole 134. After being compressed, the elastic sealing gasket 132 expands radially outward and gradually fits tightly against the inner wall of the pipe to be tested, thereby forming a reliable seal.

[0069] Because the expansion of the elastic sealing gasket 132 consumes some pressurized water, the internal pressure of the water injection pipe 12 will temporarily decrease. As the elastic sealing gasket 132 gradually expands to its elastic limit, the first safety valve 52 automatically resets and closes the connection with the first connecting pipe 53. Thereafter, the external water supply device continues to pressurize the pipe under test to perform a water pressure sealing test on the pipe under test.

[0070] When a pipe burst test is required, the second safety valve 73 can be activated in advance, and the opening pressure of the second safety valve 73 can be set lower than the opening pressure of the first safety valve 52.

[0071] During the expansion of the elastic sealing gasket 132, the internal pressure of the first connecting pipe 53 gradually increases. When it reaches the opening pressure of the second safety valve 73, the second safety valve 73 opens, allowing the pressurized water inside the first connecting pipe 53 to enter the hydraulic drive unit 71 and then into the outer rod 712, thereby pushing the inner rod 713 to move.

[0072] When the inner rod 713 moves, it drives the end block 72 to move synchronously. The end block 72 further drives the first plate 61 to move, thereby unfolding the flexible protective net to the outer periphery of the pipe to be tested. When the first plate 61 moves to a position near the movable support plate 2, the flexible protective net is fully unfolded and forms an outer protective structure.

[0073] Subsequently, as the pressure changes, the second safety valve 73 automatically resets and closes the connection with the hydraulic drive unit 71; then the first safety valve 52 also automatically resets, closing the connection with the first connecting pipe 53. Finally, the external water supply device continues to increase the internal pressure of the pipe under test in order to perform a pipe burst test on the pipe under test.

[0074] When the pipeline under test bursts, the flexible protective net can effectively block the burst fragments, thereby reducing the risk of fragments scattering and improving the safety of the testing process.

[0075] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0076] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A water pressure testing device for fiberglass reinforced plastic (FRP) sand-filled pipes, comprising two sets of end support plates (1), a sealing plate (11) fixedly disposed on the left end support plate (1), and a movable support plate (2) disposed on the right end support plate (1), wherein another set of sealing plates (11) corresponding to the left sealing plate (11) is disposed on the movable support plate (2), and a driving device (3) for driving the movable support plate (2) to move is disposed between the two sets of end support plates (1), characterized in that: The sealing plate (11) is provided with a sealing ring plate (13) on the adjacent side. The sealing ring plate (13) is provided with a hollow ring plate (131) inside. The hollow ring plate (131) is provided with an elastic sealing gasket (132) communicating with its interior on the outside. The sealing ring plate (13) is provided with a water injection pipe (12) for injecting test water into the pipe to be tested at the center. The water injection pipe (12) is provided with a pressure injection device (5) for delivering pressurized water into the elastic sealing gasket (132). The pipe to be tested is provided with a flexible protective net around its perimeter. The flexible protective net is connected to an unfolding device (7) for driving its unfolding. The unfolding device (7) is connected to the pressure injection device (5).

2. The fiberglass reinforced plastic (FRP) pipe water pressure testing device according to claim 1, characterized in that: The driving device (3) includes two sets of rotating rods (32) rotatably disposed between two sets of end support plates (1). The two sets of rotating rods (32) are arranged in parallel. The left end support plate (1) is provided with a drive motor (31) for driving the two sets of rotating rods (32) to rotate synchronously. The top of the movable support plate (2) is provided with a hanging ear (21), which is threadedly connected to the rotating rod (32).

3. The fiberglass reinforced plastic (FRP) pipe water pressure testing device according to claim 2, characterized in that: The flexible protective net is square in shape and is fitted around the outer perimeter of the pipe to be tested. The two sides of one end of the flexible protective net are respectively connected to the first plate (61) and the second plate (62). The four corners of the other end of the flexible protective net are respectively connected to the end support plate (1) on the left side. The two sets of end support plates (1) are fixedly provided with support rods (14) on adjacent sides. The first plate (61) is slidably set on the support rod (14), and the second plate (62) is slidably set on the rotating rod (32). The unfolding device (7) includes a hydraulic drive unit (71) set on the outside of the end support plate (1). The drive end of the hydraulic drive unit (71) is provided with an end block (72). The end block (72) is fixedly connected to the first plate (61) so as to drive the flexible protective net to unfold through the first plate (61). A second safety valve (73) is provided between the unfolding device (7) and the injection device (5).

4. The fiberglass reinforced plastic (FRP) pipe water pressure testing device according to claim 3, characterized in that: The hydraulic drive unit (71) includes a hollow rod (711) disposed on the outside of the left end support plate (1). Two sets of outer rods (712) are fixedly disposed on the right side of the hollow rod (711). The two sets of outer rods (712) pass through the left end support plate (1) and are fixedly connected to the left end support plate (1). An inner rod (713) is slidably disposed inside the outer rod (712). The inner rod (713) is connected to the end block (72). A piston-type sliding sealing structure is formed between the outer rod (712) and the inner rod (713). The interior of the outer rod (712) is connected to the interior of the hollow rod (711). A return spring (714) is disposed inside the outer rod (712). One end of the return spring (714) is connected to the inner wall of the outer rod (712), and the other end is connected to the inner rod (713) so as to drive the inner rod (713) to reset after the hydraulic pressure is released.

5. The water pressure testing device for fiberglass reinforced plastic (FRP) sand-filled pipes according to claim 1, characterized in that: The pressure injection device (5) includes a T-type three-way valve (51) installed on the water injection pipe (12). The left and right ends of the T-type three-way valve (51) are connected to the water injection pipe (12) respectively. The bottom end of the T-type three-way valve (51) is connected to the inlet end of the first safety valve (52). The outlet end of the first safety valve (52) is connected to the first connecting pipe (53). The other end of the first connecting pipe (53) is connected to the inside of the sealing ring plate (13).

6. The fiberglass reinforced plastic (FRP) pipe water pressure testing device according to claim 1, characterized in that: Pressure sensors (8) are respectively installed on the water injection pipe (12) and the first connecting pipe (53). The pressure sensors (8) are electrically connected to the external control system (9). The first safety valve (52) and the second safety valve (73) are both electrically connected to the external control system (9). The external control system (9) is used to control the opening or closing of the first safety valve (52) and the second safety valve (73) according to the pressure signal detected by the pressure sensor (8).

7. The fiberglass reinforced plastic (FRP) pipe water pressure testing device according to claim 6, characterized in that: Both the first safety valve (52) and the second safety valve (73) adopt an electrically controlled safety valve structure. Both the first safety valve (52) and the second safety valve (73) are equipped with electromagnetic drive components. The electromagnetic drive components are used to receive control signals from the external control system (9) to drive the valve core to move.

8. The fiberglass reinforced plastic (FRP) pipe water pressure testing device according to claim 1, characterized in that: The sealing ring plate (13) has a connecting cavity (133) inside, which is connected to the interior of the hollow ring plate (131). The outer ring wall of the hollow ring plate (131) has a connecting hole (134) that is connected to the interior of the elastic sealing gasket (132). The sealing ring plate (13) has multiple sets of hollow ring plates (131) inside, which are arranged concentrically at intervals.

9. A water pressure testing device for fiberglass reinforced plastic (FRP) sand-filled pipes according to claim 1, characterized in that: The upper half of the inner end face of the sealing ring plate (13) is provided with an exhaust channel (135), which is used to discharge the air inside the pipe to be tested in the initial stage of water injection.

10. A method for testing the water pressure of fiberglass reinforced plastic (FRP) pipes using the device described in any one of claims 1-9, characterized in that: Includes the following steps: S1. Adjust the distance between the two sets of sealing plates (11) and seal both ends of the pipe to be tested; S2. Inject water into the pipe to be tested through the water injection pipe (12); S3. After the internal pressure of the pipeline to be tested reaches the preset value, pressurized water is delivered into the elastic sealing gasket (132) through the injection device (5) to drive the elastic sealing gasket (132) to expand and form a seal. S4. During the pipe burst test, the flexible protective net is deployed by the deployment device (7); S5. Continue to increase the internal pressure of the pipe to be tested in order to conduct the test.

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