Rapid alternate high-pressure cold and hot water circulation test device

Abstract

The invention provides a rapid alternate high-pressure cold and hot water circulation test device, and relates to the technical field of cold and hot water circulation test machines. The rapid alternate high-pressure cold and hot water circulation test device comprises a to-be-tested pipe fitting, a test cavity and a plurality of groups of bases. According to the invention, based on a composite detection structure of the flexible force-sensitive film and fiber grating sensing, full-circumferential dynamic monitoring of pipeline deformation is realized, disturbance of electromagnetic interference to sensing signals can be effectively isolated by adopting the shielding shell, and through cooperation of the rotatable clamping piece and the flexible sensing layer, the device automatically adapts to the surfaces of pipe fittings with different bending curvatures, and the detection precision is improved. Uniform contact pressure can still be kept under the high-pressure circulation working condition, measurement errors caused by hard interference are avoided, the detection position can be conveniently adjusted through an electromagnetic chuck, a pipeline fracture characteristic spectrum database can be established in combination with sound wave sensing and mechanical-deformation composite detection data, and cross validation of abnormal signals is achieved. And the accuracy and reliability of defect identification are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cold and hot water circulation testing machines, and particularly to a rapid alternating high-pressure cold and hot water circulation test device. Background Art

[0002] At present, the equipment for cold and hot water circulation tests manufactured in China usually uses one or two high-power booster pumps to achieve the pressurization of the pipeline system, and at the same time, it is also necessary to achieve the switching and circulation of cold and hot water in the pipeline system. The cold and hot water circulation test is a long-term continuous test process. Using a booster pump to provide pressure for the pipeline system, in the continuous alternation of cold and hot water, the service life of the booster pump seal is often very short, and leakage often occurs, resulting in the test pipeline pressure not meeting the requirements and the test failing. Moreover, when using a water pump for pressurization, since the booster pump is directly connected to the test pipeline, the pressure in the test pipeline system is usually unstable and fluctuates greatly. At the same time, using a high-power electric booster pump will greatly increase the power consumption.

[0003] Therefore, there is a disclosed technology that proposes a rapid alternating high-pressure cold and hot water circulation test equipment, which relates to the technical field of cold and hot water circulation test equipment, and solves the technical problems that the booster pump of the existing cold and hot water circulation test equipment is easily damaged and causes leakage, and the pressure in the test pipeline system is usually unstable. The present invention includes a normal temperature water circulation system, a hot water circulation system, a pressure test pipeline system, and a PLC control system. The normal temperature water circulation system and the hot water circulation system are respectively connected to both ends of the pressure test pipeline system. The water tanks of the normal temperature water circulation system and the hot water circulation system are both connected to the air compression system through pipelines. A refrigeration and heating unit circulation pipe is arranged in the normal temperature water circulation system, and the refrigeration and heating unit circulation pipe is connected to an external refrigeration and heating unit. This disclosed technology claims that it has a simple structure, uses high-pressure compressed air to provide a pressure source for the test pipeline system, and then provides a constant test pressure for the pipeline system through an electromagnetic proportional pressure regulating valve. Although the above-mentioned disclosed technology introduces an air compression system to replace water pump pressurization and stabilizes the pressure through an electromagnetic proportional pressure regulating valve, its core innovation is still limited to the optimization of the pressure supply method.

[0004] More importantly, the current cold and hot water circulation test equipment relies heavily on manual intervention in the pipeline deformation and rupture detection link. The mainstream solution uses transparent explosion-proof plexiglass tubes for visual inspection, which has problems such as high detection lag, large missed detection rate of small deformations, and prominent risk of human subjective misjudgment. Especially in the high-pressure rapid circulation working condition, it is difficult to capture the local expansion or crack initiation of the pipeline in real time, which directly affects the reliability of test data and the equipment safety warning ability. How to achieve automatic and high-precision dynamic monitoring of pipeline deformation is still a bottleneck restricting the technological upgrading in this field. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a rapid alternating high-pressure cold and hot water circulation test device, which solves the problems of high detection lag, large undetected rate of minute deformations, and prominent risk of human subjective misjudgment existing in the rapid alternating high-pressure cold and hot water circulation test device in the prior art.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A rapid alternating high-pressure cold and hot water circulation test device includes a pipe fitting to be tested, a test chamber, and multiple groups of bases. Multiple groups of the bases are all arranged inside the test chamber. The base is composed of an electromagnetic chuck, a first shielding shell, and a connecting seat. The electromagnetic chuck is arranged inside the first shielding shell. The connecting seat is fixedly connected to the top of the first shielding shell. A first fixing plate is arranged on the connecting seat through a first upright post. The upper wall of the first fixing plate and at the end far from the first upright post is fixedly connected with a second shielding shell. The lower wall of the first fixing plate is connected to an upper mounting sleeve through a lifting drive structure. The upper mounting sleeve is detachably connected with an upper clamping piece. The upper wall of the connecting seat and at the rear side of the first upright post is fixedly connected with a lower mounting sleeve. The lower mounting sleeve is coaxially arranged with the upper mounting sleeve. The end of the lower mounting sleeve far from the connecting seat is detachably connected with a lower clamping piece. The axial projections of the lower clamping piece and the upper clamping piece are both semicircular. A pressure detection structure for detecting pressure changes is arranged between the opposite sides of the lower clamping piece and the upper clamping piece. The pressure detection structure includes a first flexible force-sensitive film, a third flexible force-sensitive film, four groups of second flexible force-sensitive films, four groups of fourth flexible force-sensitive films, two groups of first grating sensors, and two groups of second grating sensors. The upper wall of the connecting seat and at the right side of the first upright post is provided with a second fixing plate through a second upright post. The upper wall of the second fixing plate and at the end far from the second upright post is provided with a sound wave detection structure for detecting sound waves.

[0007] Preferably, the first flexible force-sensitive film is fixedly connected to the inner upper wall of the upper clamping piece. The length direction of the first flexible force-sensitive film is parallel to the axis of the upper clamping piece. The four groups of second flexible force-sensitive films are all arranged on the inner upper wall of the upper clamping piece and are respectively arranged in pairs on the front and rear sides of the first flexible force-sensitive film. The four groups of second flexible force-sensitive films are respectively close to the two axial ends of the upper clamping piece. The two groups of first grating sensors are both arranged on the inner upper wall of the upper clamping piece and are respectively located on the front and rear sides of the first flexible force-sensitive film. The first grating sensor is located between the two groups of the four groups of second flexible force-sensitive films on the same side as the first flexible force-sensitive film.

[0008] Preferably, the third flexible force-sensitive film is fixedly connected to the inner upper wall of the lower clamping piece. The length direction of the third flexible force-sensitive film is parallel to the axis of the lower clamping piece. The four fourth flexible force-sensitive films are all arranged on the inner upper wall of the lower clamping piece and are respectively arranged in pairs on the front and rear sides of the third flexible force-sensitive film. The four fourth flexible force-sensitive films are respectively close to the two axial ends of the lower clamping piece. The two first grating sensors are both arranged on the inner upper wall of the lower clamping piece and are respectively located on the front and rear sides of the third flexible force-sensitive film. The first grating sensor is located between the two groups of the four fourth flexible force-sensitive films on the same side of the third flexible force-sensitive film.

[0009] Preferably, the lifting drive structure is an electric telescopic rod. The electric telescopic rod is fixedly connected to the upper wall of the first fixing plate and is located inside the second shielding shell. The extending shaft of the electric telescopic rod penetrates through the inner wall of the first fixing plate and extends to the lower side of the first fixing plate. The end of the extending shaft of the electric telescopic rod is fixedly connected to the upper end of the upper mounting sleeve.

[0010] Preferably, the acoustic wave detection structure is an acoustic wave sensor. The acoustic wave sensor is fixedly connected to the upper wall of the second fixing plate and is located at one end far from the second column.

[0011] Preferably, the lower wall of the upper mounting sleeve is detachably connected with an upper connecting rod. The upper clamping piece is arranged at one end of the upper connecting rod far from the upper mounting sleeve. The upper clamping piece is detachably connected with the upper mounting sleeve through the upper connecting rod. The upper end of the lower mounting sleeve is detachably connected with a lower connecting rod. The lower clamping piece is arranged at one end of the lower connecting rod far from the lower mounting sleeve. The lower clamping piece is detachably connected with the lower mounting sleeve through the lower connecting rod.

[0012] Preferably, the lower end of the upper connecting rod is fixedly connected with a first fixing disk. The lower wall of the first fixing disk is rotationally connected with a first rotating disk. The lower wall of the first rotating disk is fixedly connected with the upper wall of the upper clamping piece. The upper end of the lower connecting rod is fixedly connected with a second fixing disk. The upper wall of the second fixing disk is rotationally connected with a second rotating disk. The lower clamping piece is fixedly connected to the upper wall of the second rotating disk.

[0013] Preferably, the lower wall of the first shielding shell is fixedly connected with a wear-resistant pad. The wear-resistant pad is a polytetrafluoroethylene plate. A circular hole penetrating up and down is arranged on the inner wall of the wear-resistant pad. The inner diameter of the circular hole is larger than the inner diameter of the electromagnetic chuck. The height of the lower wall of the electromagnetic chuck is 0.2 mm higher than that of the wear-resistant pad.

[0014] Preferably, the first fixing plate and the first column, and the second fixing plate and the second column are respectively locked by a set of quick-lock screws.

[0015] Preferably, both the first shielding shell and the second shielding shell are made of an electromagnetic shielding alloy. The electromagnetic shielding alloy is internally filled with an insulating ceramic layer. The shielding strength of both the first shielding shell and the second shielding shell is greater than 20 dB.

[0016] The present invention provides a rapid alternating high-pressure cold and hot water circulation test device, which has the following beneficial effects: Compared with the prior art, the rapid alternating high-pressure cold and hot water circulation test device, based on the composite detection structure of a flexible force-sensitive film and a fiber Bragg grating sensor, realizes the full circumferential dynamic monitoring of pipeline deformation, can synchronously capture minute expansion, local depression and crack initiation, overcomes the subjectivity and lag defects of manual visual inspection, and uses a shielding shell to effectively isolate the disturbance of electromagnetic interference to the sensing signal.

[0017] Compared with the prior art, the rapid alternating high-pressure cold and hot water circulation test device, through the cooperation of a rotatable clamping piece and a flexible sensing layer, automatically adapts to the surfaces of pipe fittings with different bending curvatures, and can still maintain a uniform contact pressure under high-pressure circulation conditions, avoiding measurement errors caused by hard interference, and using an electromagnetic chuck can conveniently adjust the detection position.

[0018] Compared with the prior art, the rapid alternating high-pressure cold and hot water circulation test device, by combining acoustic wave sensing and mechanical-deformation composite detection data, can establish a pipeline rupture characteristic atlas library, realize the cross-verification of abnormal signals, and greatly improve the accuracy and reliability of defect identification. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is of the present invention Figure 1 partial enlarged view of part A in; Figure 3 is of the present invention Figure 1 partial enlarged view of part B in; Figure 4 is a schematic diagram of the upward-facing structure of the upper clamping piece of the present invention; Figure 5 is a schematic cross-sectional view of the connection structure of the first shielding shell, the electromagnetic chuck and the wear-resistant pad of the present invention; Figure 6 is a partial cross-sectional view of the connection structure of the second shielding shell, the first fixing plate and the electric telescopic rod of the present invention.

[0020] Among them, 1. The first shielding shell; 2. The connecting seat; 3. The first upright column; 4. The first fixing plate; 5. The second shielding shell; 6. The electric telescopic rod; 7. The upper mounting sleeve; 8. The upper connecting rod; 9. The second upright column; 10. The lower mounting sleeve; 11. The first fixing disk; 12. The first rotating disk; 13. The upper clamping piece; 14. The first flexible force-sensitive film; 15. The second flexible force-sensitive film; 16. The first grating sensor; 17. The second fixing plate; 18. The acoustic wave sensor; 19. The lower connecting rod; 20. The second fixing disk; 21. The second rotating disk; 22. The lower clamping piece; 23. The third flexible force-sensitive film; 24. The fourth flexible force-sensitive film; 25. The second grating sensor; 26. The electromagnetic chuck; 27. The wear-resistant pad. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0022] As Figures 1 to 6 shown, the embodiment of the present invention provides a rapid alternating high-pressure cold and hot water circulation test device, including a pipe fitting to be tested, a test chamber and multiple groups of bases, and multiple groups of bases are all arranged inside the test chamber; In order to achieve the rapid positioning and stable adsorption of the detection base in the test chamber, and at the same time adapt to the detection requirements of different pipe fitting shapes, the base is composed of an electromagnetic chuck 26, a first shielding shell 1 and a connecting seat 2. The electromagnetic chuck 26 is arranged inside the first shielding shell 1, the connecting seat 2 is fixedly connected to the top of the first shielding shell 1, and the lower wall of the first shielding shell 1 is fixedly connected with a wear-resistant pad 27. The wear-resistant pad 27 is a polytetrafluoroethylene plate. A circular hole penetrating up and down is arranged on the inner wall of the wear-resistant pad 27. The inner diameter of the circular hole is larger than the inner diameter of the electromagnetic chuck 26. The height of the lower wall of the electromagnetic chuck 26 is 0.2 mm higher than that of the wear-resistant pad 27. Through the adsorption of the electromagnetic chuck 26 on the magnetic conductive area at the bottom of the test chamber, the rigid fixation of the base module is realized; the wear-resistant pad 27 reduces the frictional loss when the base moves, and through the height difference design, the electromagnetic chuck 26 is prevented from directly contacting the bottom surface of the test chamber to ensure the adsorption stability. This structure supports the free adjustment of the positions of multiple groups of bases along the bottom of the test chamber to adapt to the multi-point detection requirements of different pipe fitting shapes such as straight pipes and bent pipes; To ensure the precise clamping and coaxial alignment of the upper clamping piece 13 and the lower clamping piece 22 on the pipe fitting and avoid measurement errors caused by installation deviations, a first fixing plate 4 is provided on the connecting seat 2 through a first upright column 3. A second shielding shell 5 is fixedly connected to the upper wall of the first fixing plate 4 at one end far from the first upright column 3. The lower wall of the first fixing plate 4 is connected to an upper mounting sleeve 7 through a lifting drive structure. The upper mounting sleeve 7 is detachably connected to the upper clamping piece 13. The lifting drive structure is an electric telescopic rod 6. The electric telescopic rod 6 is fixedly connected to the upper wall of the first fixing plate 4 and is located inside the second shielding shell 5. The extending shaft of the electric telescopic rod 6 penetrates through the inner wall of the first fixing plate 4 and extends below the first fixing plate 4. The end of the extending shaft of the electric telescopic rod 6 is fixedly connected to the upper end of the upper mounting sleeve 7. The electric telescopic rod 6 drives the upper clamping piece 13 to vertically lift and form a coaxial clamping space with the lower clamping piece 22. During operation, the pipe fitting is placed on the lower clamping piece 22, and the upper clamping piece 13 is pressed down to close, ensuring that the axis of the pipe fitting is aligned with the lower clamping piece 22 and the upper clamping piece 13. This design effectively eliminates the eccentricity problem of manual clamping and provides a high-precision reference for subsequent deformation detection; In order to adapt to the curvature change of the pipe fitting surface, maintain a uniform contact pressure between the sensing layer and the pipe wall, and improve the sensitivity of deformation detection, a lower mounting sleeve 10 is fixedly connected to the upper wall of the connecting seat 2 and behind the first column 3. The lower mounting sleeve 10 is coaxially arranged with the upper mounting sleeve 7. One end of the lower mounting sleeve 10 away from the connecting seat 2 is detachably connected with a lower clamping piece 22. The axial projections of the lower clamping piece 22 and the upper clamping piece 13 are both semicircular. A pressure detection structure for detecting pressure changes is arranged between the opposite sides of the lower clamping piece 22 and the upper clamping piece 13. The pressure detection structure includes a first flexible force-sensitive film 14, a third flexible force-sensitive film 23, four groups of second flexible force-sensitive films 15, four groups of fourth flexible force-sensitive films 24, two groups of first grating sensors 16 and two groups of second grating sensors 25. The first flexible force-sensitive film 14 is fixedly connected to the inner upper wall of the upper clamping piece 13. The length direction of the first flexible force-sensitive film 14 is parallel to the axis of the upper clamping piece 13. The four groups of second flexible force-sensitive films 15 are all arranged on the inner upper wall of the upper clamping piece 13 and are respectively arranged in pairs on the front and back sides of the first flexible force-sensitive film 14. The four groups of second flexible force-sensitive films 15 are respectively close to the two axial ends of the upper clamping piece 13. The two groups of first grating sensors 16 are both arranged on the inner upper wall of the upper clamping piece 13 and are respectively located on the front and back sides of the first flexible force-sensitive film 14. The first grating sensor 16 is located between the two groups of the four groups of second flexible force-sensitive films 15 on the same side as the first flexible force-sensitive film 14. The third flexible force-sensitive film 23 is fixedly connected to the inner upper wall of the lower clamping piece 22. The length direction of the third flexible force-sensitive film 23 is parallel to the axis of the lower clamping piece 22. The four groups of fourth flexible force-sensitive films 24 are all arranged on the inner upper wall of the lower clamping piece 22 and are respectively arranged in pairs on the front and back sides of the third flexible force-sensitive film 23. The four groups of fourth flexible force-sensitive films 24 are respectively close to the two axial ends of the lower clamping piece 22. The two groups of second grating sensors 25 are both arranged on the inner upper wall of the lower clamping piece 22 and are respectively located on the front and back sides of the third flexible force-sensitive film 23. The second grating sensor 25 is located between the two groups of the four groups of fourth flexible force-sensitive films 24 on the same side as the third flexible force-sensitive film 23. When clamping the pipe fitting, the upper clamping piece 13 and the lower clamping piece 22 can adaptively rotate around the first rotating disc 12 and the second rotating disc 21, so that the semicircular clamping surface fits the outer wall of the pipe fitting. The first flexible force-sensitive film 14 and the third flexible force-sensitive film 23 are attached to the pipe wall to sense the pressure distribution in real time. The second flexible force-sensitive films 15 and the fourth flexible force-sensitive films 24 are distributed at both axial ends to capture local deformations. The first grating sensors 16 and the second grating sensors 25 convert the mechanical signals into wavelength offsets. This structure can still maintain stable contact under high-pressure cycles, avoiding signal distortion caused by hard interference; In order to synchronously acquire the acoustic characteristics of pipe fitting deformation and rupture, a second fixed plate 17 is provided on the upper wall of the connecting seat 2 and to the right of the first column 3 through the second column 9. An acoustic wave detection structure for detecting acoustic waves is provided at one end of the upper wall of the second fixed plate 17 away from the second column 9. The acoustic wave detection structure is an acoustic wave sensor 18. The acoustic wave sensor 18 is fixedly connected to the upper wall of the second fixed plate 17 at one end away from the second column 9. During the alternating circulation of cold and hot water, the acoustic wave sensor 18 captures the high-frequency acoustic emission signals generated by the initiation of cracks in the pipe wall, and the pressure detection structure synchronously records the change in contact pressure caused by deformation; In order to quickly replace clamping pieces of different specifications and expand the detection points, and improve the compatibility of the equipment with different pipe diameters, the lower wall of the upper mounting sleeve 7 is detachably connected with an upper connecting rod 8. The upper clamping piece 13 is arranged at one end of the upper connecting rod 8 away from the upper mounting sleeve 7. The upper clamping piece 13 is detachably connected with the upper mounting sleeve 7 through the upper connecting rod 8. The upper end of the lower mounting sleeve 10 is detachably connected with a lower connecting rod 19. The lower clamping piece 22 is arranged at one end of the lower connecting rod 19 away from the lower mounting sleeve 10. The lower clamping piece 22 is detachably connected with the lower mounting sleeve 10 through the lower connecting rod 19. When replacing the pipe diameter, only the upper connecting rod 8 and the lower connecting rod 19 need to be disassembled, and the corresponding upper clamping piece 13 and lower clamping piece 22 need to be replaced, without overall disassembly and assembly of the base. Multiple groups of bases can be independently adjusted in position at the bottom of the test chamber. For example, when detecting a U-shaped pipe, the three bases are respectively positioned at the bend vertex and the two straight pipe segments to achieve full-path deformation coverage. The modular design enables the equipment to be compatible with pipe diameters from DN15 to DN200, greatly improving the detection efficiency; In order to adapt to different curvatures of pipe fittings, the lower end of the upper connecting rod 8 is fixedly connected with a first fixed disk 11. The lower wall of the first fixed disk 11 is rotatably connected with a first rotating disk 12. The lower wall of the first rotating disk 12 is fixedly connected with the upper wall of the upper clamping piece 13. The upper end of the lower connecting rod 19 is fixedly connected with a second fixed disk 20. The upper wall of the second fixed disk 20 is rotatably connected with a second rotating disk 21. The lower clamping piece 22 is fixedly connected to the upper wall of the second rotating disk 21. Through the cooperation of the second rotating disk 21, the first rotating disk 12 and the flexible sensing layer, it can automatically adapt to the surfaces of pipe fittings with different bending curvatures, and still maintain a uniform contact pressure under high-pressure circulation conditions, avoiding measurement errors caused by hard interference; In order to facilitate quick adjustment, the first fixed plate 4 and the first column 3, and the second fixed plate 17 and the second column 9 are respectively locked by a set of quick-lock screws. After loosening the quick-lock screws, the height position of the first fixed plate 4 can be adjusted on the first column 3 and the height position of the second fixed plate 17 can be adjusted on the second column 9; In order to eliminate environmental interference through electromagnetic shielding and improve the detection signal-to-noise ratio, both the first shielding case 1 and the second shielding case 5 are made of electromagnetic shielding alloy. The electromagnetic shielding alloy is filled with an insulating ceramic layer inside. The shielding strength of both the first shielding case 1 and the second shielding case 5 is greater than 20 dB. The first shielding case 1 and the second shielding case 5 adopt electromagnetic shielding alloy, and the signal lines of the pressure detection structure and the acoustic wave sensor 18 are all routed through the shielding channels preset inside the shielding case.

[0023] Working principle: The rigid fixation of the base module is achieved through the adsorption of the electromagnetic chuck 26 to the magnetically conductive area at the bottom of the test chamber; the wear-resistant pad 27 reduces the frictional loss during the movement of the base and avoids the direct contact between the electromagnetic chuck 26 and the bottom surface of the test chamber through the height difference design to ensure the adsorption stability. This structure supports the free adjustment of the positions of multiple groups of bases along the bottom of the test chamber to adapt to the multi-point detection requirements of pipe fittings with different shapes such as straight pipes and bent pipes; the electric telescopic rod 6 drives the upper clamping piece 13 to lift vertically to form a coaxial clamping space with the lower clamping piece 22. During operation, the pipe fitting is placed on the lower clamping piece 22, and the upper clamping piece 13 presses down and closes to ensure that the axis of the pipe fitting is aligned with the lower clamping piece 22 and the upper clamping piece 13. This design effectively eliminates the eccentricity problem of manual clamping and provides a high-precision reference for subsequent deformation detection; when clamping the pipe fitting, the upper clamping piece 13 and the lower clamping piece 22 can rotate adaptively around the first rotating disk 12 and the second rotating disk 21 to make the semi-circular clamping surface fit the outer wall of the pipe fitting. The first flexible force-sensitive film 14 and the third flexible force-sensitive film 23 are attached to the pipe wall to sense the pressure distribution in real time, and the second flexible force-sensitive film 15 and the fourth flexible force-sensitive film 24 are distributed at both axial ends to capture local deformations. The first grating sensor 16 and the second grating sensor 25 convert the mechanical signals into wavelength offsets. This structure can still maintain stable contact under high-pressure cycling, avoiding signal distortion caused by hard interference; during the alternating cold and hot water cycle, the acoustic wave sensor 18 captures the high-frequency acoustic emission signals of the crack initiation on the pipe wall, and the pressure detection structure synchronously records the change in the contact pressure caused by the deformation; when changing the pipe diameter, only the upper connecting rod 8 and the lower connecting rod 19 need to be disassembled and the corresponding upper clamping piece 13 and lower clamping piece 22 need to be replaced, without the need to disassemble and assemble the base as a whole. Multiple groups of bases can be independently adjusted in position at the bottom of the test chamber. For example, when detecting a U-shaped pipe, the three bases are respectively positioned at the vertex of the bent pipe and the two straight pipe sections to achieve full-path deformation coverage. The modular design enables the device to be compatible with pipe diameters from DN15 to DN200, greatly improving the detection efficiency; through the cooperation of the second rotating disk 21, the first rotating disk 12 and the flexible sensing layer, it can automatically adapt to the surfaces of pipe fittings with different bending curvatures and still maintain a uniform contact pressure under high-pressure cycling conditions, avoiding measurement errors caused by hard interference. After loosening the quick-lock screws, the height position of the first fixing plate 4 can be adjusted on the first column 3 and the height position of the second fixing plate 17 can be adjusted on the second column 9; the first shielding case 1 and the second shielding case 5 adopt electromagnetic shielding alloy, and the signal lines of the pressure detection structure and the acoustic wave sensor 18 are all routed through the shielding channels preset inside the shielding case.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rapid alternating high-pressure hot and cold water cycle test device, characterized in that: The invention comprises a pipe to be tested, a test chamber and a plurality of bases, wherein the plurality of bases are arranged inside the test chamber, the bases are composed of an electromagnetic suction cup (26), a first shielding shell (1) and a connecting seat (2), the electromagnetic suction cup (26) is arranged inside the first shielding shell (1), the connecting seat (2) is fixedly connected to the top of the first shielding shell (1), a first fixing plate (4) is arranged on the connecting seat (2) via a first column (3), a second shielding shell (5) is fixedly connected to the upper wall of the first fixing plate (4) and at an end away from the first column (3), an upper mounting sleeve (7) is connected to the lower wall of the first fixing plate (4) via a lifting drive structure, the upper mounting sleeve (7) is detachably connected to an upper clamping plate (13), a lower mounting sleeve (10) is fixedly connected to the upper wall of the connecting seat (2) and at the rear side of the first column (3), the lower mounting sleeve (10) and the upper mounting sleeve (7) are fixedly connected. The lower mounting sleeve (10) is coaxially arranged, and one end of the lower mounting sleeve (10) away from the connecting seat (2) is detachably connected to a lower clamping plate (22), and the axial projections of the lower clamping plate (22) and the upper clamping plate (13) are both semicircular. A pressure detection structure for detecting pressure changes is arranged between the opposite sides of the lower clamping plate (22) and the upper clamping plate (13), and the pressure detection structure comprises a first flexible force-sensitive membrane (14), a third flexible force-sensitive membrane (23), four groups of second flexible force-sensitive membranes (15), four groups of fourth flexible force-sensitive membranes (24), two groups of first grating sensors (16) and two groups of second grating sensors (25). A second fixing plate (17) is arranged on the upper wall of the connecting seat (2) and located on the right side of the first column (3) through the second column (9), and a sound wave detection structure for detecting sound waves is arranged on the upper wall of the second fixing plate (17) and located at an end away from the second column (9).

2. A rapid alternating high-pressure hot and cold water cycle test device according to claim 1, characterized in that: The first flexible force-sensitive membrane (14) is fixedly connected to the inner upper wall of the upper clamping piece (13); the length direction of the first flexible force-sensitive membrane (14) is parallel to the axial direction of the upper clamping piece (13); the four groups of the second flexible force-sensitive membranes (15) are all arranged on the inner upper wall of the upper clamping piece (13) and are arranged in pairs on the front and rear sides of the first flexible force-sensitive membrane (14); the four groups of the second flexible force-sensitive membranes (15) are respectively close to the axial ends of the upper clamping piece (13); the two groups of the first grating sensors (16) are all arranged on the inner upper wall of the upper clamping piece (13) and are respectively located on the front and rear sides of the first flexible force-sensitive membrane (14); the first grating sensor (16) is located between the two groups of the four groups of the second flexible force-sensitive membranes (15) located on the same side of the first flexible force-sensitive membrane (14).

3. A rapid alternating high-pressure hot and cold water cycle test device according to claim 2, characterized in that: The third flexible force-sensitive membrane (23) is fixedly connected to the inner upper wall of the lower clamping plate (22); the length direction of the third flexible force-sensitive membrane (23) is parallel to the axial direction of the lower clamping plate (22); the four groups of the fourth flexible force-sensitive membranes (24) are all arranged on the inner upper wall of the lower clamping plate (22) and are arranged in pairs on the front and rear sides of the third flexible force-sensitive membrane (23); the four groups of the fourth flexible force-sensitive membranes (24) are respectively close to the axial ends of the lower clamping plate (22); the two groups of the second grating sensors (25) are all arranged on the inner upper wall of the lower clamping plate (22) and are respectively located on the front and rear sides of the third flexible force-sensitive membrane (23); the second grating sensor (25) is located between the two groups of the four groups of the fourth flexible force-sensitive membranes (24) located on the same side of the third flexible force-sensitive membrane (23).

4. A rapid alternating high-pressure hot and cold water cycle test device according to claim 3, characterized in that: The lifting drive structure is an electric telescopic rod (6), the electric telescopic rod (6) is fixedly connected to the upper wall of the first fixed plate (4) and is located inside the second shielding shell (5), the extension shaft of the electric telescopic rod (6) passes through the inner wall of the first fixed plate (4) and extends to the bottom of the first fixed plate (4), and the end of the extension shaft of the electric telescopic rod (6) is fixedly connected to the upper end of the upper mounting sleeve (7).

5. A rapid alternating high-pressure hot and cold water cycle test device according to claim 4, characterized in that: The sound wave detection structure is a sound wave sensor (18), and the sound wave sensor (18) is fixedly connected to the upper wall of the second fixing plate (17) and is located at an end away from the second column (9).

6. A rapid alternating high-pressure cold and hot water cycle test device according to claim 5, characterized in that: The lower wall of the upper mounting sleeve (7) is detachably connected to an upper connecting rod (8); the upper clamping piece (13) is arranged at one end of the upper connecting rod (8) away from the upper mounting sleeve (7); the upper clamping piece (13) is detachably connected to the upper mounting sleeve (7) via the upper connecting rod (8); the upper end of the lower mounting sleeve (10) is detachably connected to a lower connecting rod (19); the lower clamping piece (22) is arranged at one end of the lower connecting rod (19) away from the lower mounting sleeve (10); the lower clamping piece (22) is detachably connected to the lower mounting sleeve (10) via the lower connecting rod (19).

7. A rapid alternating high-pressure cold and hot water cycle test device according to claim 6, characterized in that: The lower end of the upper connecting rod (8) is fixedly connected to a first fixed disk (11), the lower wall of the first fixed disk (11) is rotatably connected to a first rotating disk (12), the lower wall of the first rotating disk (12) is fixedly connected to an upper wall of an upper clamping plate (13), the upper end of the lower connecting rod (19) is fixedly connected to a second fixed disk (20), the upper wall of the second fixed disk (20) is rotatably connected to a second rotating disk (21), and the lower clamping plate (22) is fixedly connected to the upper wall of the second rotating disk (21).

8. The rapid alternating high-pressure cold and hot water cycle test device according to claim 7, characterized in that: A wear-resistant pad (27) is fixedly connected to the lower wall of the first shielding shell (1); the wear-resistant pad (27) is a polytetrafluoroethylene plate; the inner wall of the wear-resistant pad (27) is provided with a circular hole extending vertically through the inner wall; the inner diameter of the circular hole is greater than the inner diameter of the electromagnetic suction cup (26); the lower wall of the electromagnetic suction cup (26) is 0.2 mm higher than the wear-resistant pad (27).

9. A rapid alternating high-pressure cold and hot water cycle test device according to claim 8, characterized in that: The first fixing plate (4) and the first column (3) as well as the second fixing plate (17) and the second column (9) are respectively locked by a set of quick-locking screws.

10. A rapid alternating high-pressure cold and hot water cycle test device according to claim 9, characterized in that: The first shielding shell (1) and the second shielding shell (5) are both made of an electromagnetic shielding alloy, the interior of the electromagnetic shielding alloy is filled with an insulating ceramic layer, and the shielding strength of the first shielding shell (1) and the second shielding shell (5) are both greater than 20 dB.

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