Corrugated pipe lateral performance testing device

Abstract

The invention relates to the technical field of service life testing equipment, in particular to a corrugated pipe lateral performance testing device which comprises two installation plates moving in the longitudinal direction and the transverse direction respectively, sealing assemblies are arranged on the opposite side walls of the two installation plates, and each sealing assembly comprises an isolation round pipe fixedly connected with the corresponding installation plate and arranged outside a pipe flange in a sleeving mode. The circular ring suction cup abuts against the pipe flange, the guide circular pipe is fixedly connected with the mounting plate and arranged in the pipe flange in a sleeved mode, the adapter pipe communicates with the circular ring suction cup and the guide circular pipe, and the circular ring piston is in sliding fit with the inner wall of the isolation circular pipe. The side wall, far away from the mounting plate, of the pipe flange is bonded with the circular ring piston through a double-sided butyl adhesive tape; and the double-sided butyl adhesive tape seals a flange hole of the pipe flange. The welding corrugated pipe can be detachably and fixedly installed on the installation plate through the sealing assembly, the good sealing effect is achieved, the vacuum degree in the welding corrugated pipe is effectively maintained, and the testing reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of life test equipment, in particular to a bellows lateral performance test device. Background Art

[0002] In industrial settings, welded bellows are often used to compensate for the thermal expansion and contraction of piping systems due to temperature fluctuations. However, during manufacturing, transportation, and actual operation, welded bellows are inevitably affected by factors such as installation errors, pipeline vibration, and thermal gradients, which can cause lateral deviation of their axis. Lateral deviation not only significantly reduces the fatigue life of welded bellows but can also cause localized stress concentration, leading to cracks, leaks, and even sudden failure. Therefore, before mass production of welded bellows, their tensile-compression reciprocating life under lateral deviation must be systematically tested to verify their reliability and durability under complex operating conditions.

[0003] Welded bellows are widely used in industrial applications to compensate for thermal expansion and contraction in piping systems. However, lateral deflection can occur during manufacturing and use, which can affect performance and service life. Therefore, prior to production, welded bellows require lateral deflection testing in both tensile and compressive cycles. However, existing equipment is only capable of single axial reciprocating testing and is unable to perform lateral deflection testing. Summary of the Invention

[0004] The object of the present invention is to provide a device for testing the lateral performance of a bellows to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A bellows lateral performance testing device, comprising two displacement plates that move longitudinally and transversely respectively, wherein the displacement plate is fixedly provided with a mounting frame, and the mounting frame is fixedly provided with a mounting plate, and the facing sides of the two mounting plates are respectively connected to the left and right ends of the welded bellows, and the mounting plate located on the right is provided with a vacuum hole that passes through the left and right sides and is connected to the welded bellows, and the left and right ends of the welded bellows are fixedly provided with a pipe flange, and the facing side walls of the two mounting plates are provided with a sealing assembly, and the sealing assembly includes an isolation circular tube fixedly connected to the mounting plate and sleeved on the outside of the pipe flange, a circular suction cup abutting the pipe flange, a guide circular tube fixedly connected to the mounting plate and sleeved on the pipe flange, a transfer tube respectively connected to the circular suction cup and the guide circular tube, and a circular piston slidably fitted with the inner wall of the isolation circular tube; the side wall of the pipe flange away from the mounting plate is bonded to the circular piston by double-sided butyl tape, and the double-sided butyl tape seals the flange hole of the pipe flange.

[0006] Optionally, the annular suction cup includes an annular base fixedly connected to the mounting plate, an annular suction cup mouth integrally formed with the annular base, a first annular airbag and a second annular airbag fixedly connected to the annular suction cup mouth and arranged in inner and outer concentric circles, a first sealing lip fixedly connected to the first annular airbag, and a second sealing lip fixedly connected to the second annular airbag; the first sealing lip and the second sealing lip are respectively located on the inner and outer sides of the flange hole of the pipe flange.

[0007] Optionally, the first annular airbag and the second annular airbag have the same structure, the surface of the first annular airbag close to the annular suction cup mouth and the surface of the first annular airbag close to the first sealing lip are both planes, the inner edge of the first annular airbag is an arc surface protruding inward, and the outer edge of the first annular airbag is an arc surface protruding outward.

[0008] Optionally, an airbag cavity is opened inside the first annular airbag, the cross-section of the airbag cavity is circular or elliptical, and the air pressure in the airbag cavity is standard atmospheric pressure.

[0009] Optionally, there are several adapter tubes, which are evenly arranged in a ring shape around the center of the annular suction cup. The adapter tube passes through the side wall of the annular base and is provided with an air hole, which is aligned with the flange hole of the pipe flange.

[0010] Optionally, the double-sided butyl tape has a circular ring structure, and the thickness of the double-sided butyl tape is 0.8 to 1.2 mm.

[0011] Optionally, a test platform is included, wherein vertical mounting plates and lateral displacement mechanisms are fixedly provided on the left and right sides of the upper surface of the test platform respectively, a longitudinal displacement mechanism is fixedly provided on the right side of the vertical mounting plate, and the right surface of the displacement end of the longitudinal displacement mechanism and the upper surface of the displacement end of the lateral displacement mechanism are both fixedly connected to the displacement plate.

[0012] Optionally, the mounting frame includes a transverse plate, and two vertical ribs fixed on the upper surface of the transverse plate and arranged in parallel along the front-to-back direction; the front and rear ends of the displacement plate on the left are respectively fixedly connected to the two vertical ribs on the left mounting frame, and the upper surface of the displacement plate on the right is fixedly connected to the lower surface of the transverse plate on the right mounting frame, and the front and rear ends of the mounting plate are respectively fixedly connected to the two vertical ribs.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention is simple to install and easy to disassemble. The welding bellows can be detachably fixed on the mounting plate through the sealing assembly, and a good sealing effect is achieved, effectively maintaining the vacuum degree in the welding bellows, thereby improving the reliability of the test; 2. The present invention completes vacuum establishment and pipe flange locking in a three-stage sequence of "pre-vacuuming - main vacuuming - dynamic sealing reinforcement", first axial pre-positioning, then full adsorption, and finally adaptive compression, completely eliminating micro-slip of the pipe flange during lateral fatigue testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the mounting frame, mounting plate, sealing assembly and pipe flange in the present invention; Figure 3 for Figure 2 Front view of the middle seal assembly and pipe flange; Figure 4 for Figure 3 Structural diagram of the middle section AA; Figure 5 It is a half-section view of the circular suction cup in the present invention.

[0015] In the figure: 1. Test platform; 2. Vertical mounting plate; 3. Longitudinal displacement mechanism; 4. Horizontal displacement mechanism; 5. Displacement plate; 6. Mounting frame; 7. Mounting plate; 8. Vacuum hole; 9. Sealing assembly; 10. Isolation tube; 11. Circular suction cup; 12. Guide tube; 13. Adapter tube; 14. Circular piston; 15. Double-sided butyl tape; 16. Circular base; 17. Circular suction cup nozzle; 18. First circular airbag; 19. First sealing lip; 20. Second circular airbag; 21. Second sealing lip; 22. Air hole; 23. Horizontal plate; 24. Vertical rib plate; 25. Welded bellows; 26. Pipe flange. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] Example: See Figures 1 to 2The present invention provides a device for testing the lateral performance of a bellows, comprising a test platform 1. A vertical mounting plate 2 and a lateral displacement mechanism 4 are fixed on the left and right sides of the upper surface of the test platform 1, a longitudinal displacement mechanism 3 is fixed on the right side of the vertical mounting plate 2, and a displacement plate 5 is fixed on the right surface of the displacement end of the longitudinal displacement mechanism 3 and the upper surface of the displacement end of the lateral displacement mechanism 4, respectively. The longitudinal displacement mechanism 3 and the lateral displacement mechanism 4 drive the two displacement plates 5 to move longitudinally and transversely, respectively. A mounting frame 6 is fixed on the displacement plate 5, and a mounting plate 7 is fixed on the mounting frame 6. The facing sides of the two mounting plates 7 are respectively connected to the left and right ends of the welded bellows 25. The mounting plate 7 on the right side is provided with a vacuum hole 8 that passes through the left and right sides and is connected to the welded bellows 25. The vacuum hole 8 is used to connect an external vacuum device. Pipe flanges 26 are fixed on the left and right ends of the welded bellows 25, and sealing components 9 are provided on the facing side walls of the two mounting plates 7.

[0018] The mounting frame 6 includes a transverse plate 23 and two vertical ribs 24 fixed to the upper surface of the transverse plate 23 and arranged parallel to the front-to-back direction. The front and rear ends of the displacement plate 5 on the left are respectively fixedly connected to the two vertical ribs 24 on the left mounting frame 6. The upper surface of the displacement plate 5 on the right is fixedly connected to the lower surface of the transverse plate 23 on the right mounting frame 6. The front and rear ends of the mounting plate 7 are respectively fixedly connected to the two vertical ribs 24.

[0019] The present invention can realize precise displacement adjustment of the welding bellows 25 in different directions through the cooperation of the longitudinal displacement mechanism 3 and the transverse displacement mechanism 4, thereby ensuring the accuracy of the test, breaking the original equipment that can only move axially, and realizing the lateral offset test of the welding bellows 25.

[0020] See also Figures 3 to 5 In addition to the above embodiment, the sealing assembly 9 in this embodiment includes an isolation tube 10 fixedly connected to the mounting plate 7 and sleeved outside the pipe flange 26, an annular suction cup 11 abutting the pipe flange 26, a guide tube 12 fixedly connected to the mounting plate 7 and sleeved inside the pipe flange 26, a transfer tube 13 respectively connected to the annular suction cup 11 and the guide tube 12, and an annular piston 14 slidingly engaged with the inner wall of the isolation tube 10; the side wall of the pipe flange 26 away from the mounting plate 7 is bonded to the annular piston 14 by a double-sided butyl tape 15, the double-sided butyl tape 15 having a circular ring structure and a thickness of 0.8 to 1.2 mm, and the double-sided butyl tape 15 seals the flange hole of the pipe flange 26.

[0021] In addition to the above embodiment, the annular suction cup 11 in this embodiment includes an annular base 16 fixedly connected to the mounting plate 7, an annular suction cup nozzle 17 integrally formed with the annular base 16, a first annular airbag 18 and a second annular airbag 20 fixedly connected to the annular suction cup nozzle 17 and arranged in inner and outer concentric circles, a first sealing lip 19 fixedly connected to the first annular airbag 18, and a second sealing lip 21 fixedly connected to the second annular airbag 20. The first sealing lip 19 and the second sealing lip 21 are respectively located on the inner and outer sides of the flange hole of the pipe flange 26. The first annular airbag 18 and the second annular airbag 20 have the same structure. The surface of the first annular airbag 18 near the annular suction cup nozzle 17 and the surface of the first annular airbag 18 near the first sealing lip 19 are both flat. The inner edge of the first annular airbag 18 is an inwardly protruding arc surface, and the outer edge of the first annular airbag 18 is an outwardly protruding arc surface. An airbag cavity is defined inside the first annular airbag 18 . The cross section of the airbag cavity is circular or elliptical, and the air pressure inside the airbag cavity is standard atmospheric pressure.

[0022] In the sealing assembly 9, a primary seal is provided between the first sealing lip 19, the second sealing lip 21, and the pipe flange 26, while a secondary seal is provided between the annular piston 14, the double-sided butyl tape 15, and the pipe flange 26. This present invention achieves a dual seal for the pipe flange 26. In addition to the above-described embodiment, this embodiment includes multiple adapter tubes 13, which are evenly arranged in a circular pattern around the center of the annular suction cup 11. The adapter tubes 13 extend through the sidewalls of the annular base 16 and are provided with air holes 22 aligned with the flange holes of the pipe flange 26. This effectively evacuates the interior of the sealing assembly 9.

[0023] Before conducting the lateral deflection life test of the welded bellows 25, the present invention completes vacuum establishment and pipe flange 26 locking in a three-stage sequence of "pre-vacuuming - main vacuuming - dynamic seal strengthening". The specific process is as follows: During the pre-vacuum stage, the external vacuum unit first performs a rough vacuum on the interior of the isolation tube 10 through the vacuum port 8, rapidly reducing the internal pressure to a set negative pressure. Under this negative pressure, the annular piston 14, along with the pipe flange 26 temporarily bonded with double-sided butyl tape 15, slides toward the mounting plate 7 until the end face of the annular suction cup 11 forms a preliminary contact with the pipe flange 26, achieving axial pre-positioning.

[0024] During the main vacuum stage, the vacuum unit continues to operate, expanding the negative pressure to the interior of annular suction cup 11. The negative pressure within annular suction cup 11 generates a uniform suction force across the cup surface, firmly tightening pipe flange 26 and maintaining it concentrically within sealing assembly 9, thus completing the axial locking of welded bellows 25. Simultaneously, the continuous channel formed by guide tube 12 and transfer tube 13 ensures that the negative pressure is evenly distributed on both the inside and outside of pipe flange 26, avoiding localized stress concentration.

[0025] During the dynamic seal enhancement phase, while continuous vacuuming is being applied, the internal pressure of the first and second annular airbags 18 and 20 remains constant at standard atmospheric pressure, while the external pressure is gradually decreasing. The resulting external pressure differential causes the two airbags to expand outward synchronously. The expanded airbags compress the first and second sealing lips 19 and 21, respectively, causing them to slightly deform radially and cling to the pipe flange 26. This further enhances the ability of the annular suction cup 11 to tightly adhere to the pipe flange 26, effectively securing the welded bellows 25.

[0026] The present invention establishes vacuum and secures the pipe flange 26 in a three-stage sequence: pre-vacuuming, main vacuuming, and dynamic seal reinforcement. This involves axial pre-positioning, full adsorption, and finally adaptive compression, completely eliminating microslip of the pipe flange 26 during lateral fatigue testing. The entire vacuuming process essentially establishes and maintains vacuum within the welded bellows 25. During lateral deflection testing, the air pressure within the welded bellows 25 is monitored in real time for evaluation. An increase in air pressure indicates leakage. This method effectively evaluates the sealing performance and service life of the welded bellows 25.

[0027] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A bellows lateral performance test device, comprising two displacement plates (5) that move longitudinally and transversely, respectively, a mounting frame (6) being fixed on the displacement plate (5), a mounting plate (7) being fixed on the mounting frame (6), the two mounting plates (7) having opposite sides connected to the left and right ends of a welded bellows (25), the mounting plate (7) on the right side being provided with a vacuum hole (8) that passes through the left and right ends and is in communication with the welded bellows (25), and pipe flanges (26) being fixed on the left and right ends of the welded bellows (25), characterized in that: A sealing assembly (9) is provided on the facing side walls of the two mounting plates (7), and the sealing assembly (9) includes an isolating circular tube (10) fixedly connected to the mounting plate (7) and sleeved outside the pipe flange (26), a circular ring suction cup (11) abutting against the pipe flange (26), a guide circular tube (12) fixedly connected to the mounting plate (7) and sleeved inside the pipe flange (26), a transfer tube (13) respectively connected to the circular ring suction cup (11) and the guide circular tube (12), and an annular piston (14) slidably matched with the inner wall of the isolating circular tube (10); the side wall of the pipe flange (26) away from the mounting plate (7) is bonded to the circular ring piston (14) by a double-sided butyl tape (15), and the double-sided butyl tape (15) seals the flange hole of the pipe flange (26).

2. A bellows lateral performance testing device according to claim 1, characterized in that: The annular suction cup (11) comprises an annular base (16) fixedly connected to the mounting plate (7), an annular suction cup mouth (17) integrally formed with the annular base (16), a first annular airbag (18) and a second annular airbag (20) fixedly connected to the annular suction cup mouth (17) and arranged in inner and outer concentric circles, a first sealing lip (19) fixedly connected to the first annular airbag (18), and a second sealing lip (21) fixedly connected to the second annular airbag (20); the first sealing lip (19) and the second sealing lip (21) are respectively located on the inner and outer sides of the flange hole of the pipe flange (26).

3. The device for testing the lateral performance of a corrugated pipe according to claim 2, characterized in that: The first annular airbag (18) and the second annular airbag (20) have the same structure. The surface of the first annular airbag (18) close to the annular suction cup mouth (17) and the surface of the first annular airbag (18) close to the first sealing lip (19) are both planes. The inner edge of the first annular airbag (18) is an arc surface protruding inward, and the outer edge of the first annular airbag (18) is an arc surface protruding outward.

4. The device for testing the lateral performance of a corrugated pipe according to claim 3, characterized in that: An airbag cavity is provided inside the first annular airbag (18), the cross section of the airbag cavity is circular or elliptical, and the air pressure in the airbag cavity is standard atmospheric pressure.

5. The device for testing the lateral performance of a corrugated pipe according to claim 2, characterized in that: A plurality of transfer tubes (13) are provided, and the plurality of transfer tubes (13) are evenly arranged in a ring shape about the center of the annular suction cup (11). The transfer tube (13) penetrates through the side wall of the annular base (16) and is provided with an air hole (22), and the air hole (22) is aligned with the flange hole of the pipe flange (26).

6. The bellows lateral performance testing device according to claim 1, characterized in that: The double-sided butyl tape (15) is a circular ring structure, and the thickness of the double-sided butyl tape (15) is 0.8 to 1.2 mm.

7. The bellows lateral performance testing device according to claim 1, characterized in that: The test platform (1) comprises a test platform (1), wherein a vertical installation upright plate (2) and a lateral displacement mechanism (4) are fixedly provided on the left and right sides of the upper surface of the test platform (1), a longitudinal displacement mechanism (3) is fixedly provided on the right side of the vertical installation upright plate (2), and the right surface of the displacement end of the longitudinal displacement mechanism (3) and the upper surface of the displacement end of the lateral displacement mechanism (4) are both fixedly connected to the displacement plate (5).

8. The bellows lateral performance testing device according to claim 1, characterized in that: The mounting frame (6) comprises a transverse plate (23) and two vertical ribs (24) fixedly arranged on the upper surface of the transverse plate (23) and arranged in parallel along the front-to-back direction; the front and rear ends of the displacement plate (5) located on the left are respectively fixedly connected to the two vertical ribs (24) located on the left mounting frame (6); the upper surface of the displacement plate (5) located on the right is fixedly connected to the lower surface of the transverse plate (23) located on the right mounting frame (6); and the front and rear ends of the mounting plate (7) are respectively fixedly connected to the two vertical ribs (24).

Images