A bellows lateral performance testing device

Abstract

The present application relates to life test equipment technical field, specifically to a corrugated pipe lateral performance testing device, including two respectively along longitudinal and transverse moving mounting plate, the opposite side wall of two mounting plate is equipped with sealing assembly, sealing assembly includes with mounting plate fixed connection and cover set in pipe flange outside isolation round pipe, with pipe flange abutment ring suction disc, with mounting plate fixed connection and cover set in pipe flange inside guide round pipe, respectively with ring suction disc and guide round pipe communication adapter pipe, and with isolation round pipe inner wall sliding fit ring piston;The side wall of pipe flange away from mounting plate is bonded with ring piston through double-sided butyl tape, and the flange hole of pipe flange is closed by double-sided butyl tape.The welding corrugated pipe can be detachably fixed and installed on the mounting plate by the sealing assembly, and good sealing effect is achieved, the vacuum degree in the welding corrugated pipe is effectively maintained, and the reliability of the test is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of life test equipment, in particular to a corrugated pipe lateral performance test device. BACKGROUND

[0002] In industrial sites, welded corrugated pipes are usually used to compensate for thermal expansion and contraction of pipeline systems due to temperature changes. However, welded corrugated pipes are inevitably affected by installation errors, pipeline vibrations, thermal gradients and other factors during manufacturing, transportation and actual operation, resulting in lateral deviation of their axes. Lateral deviation not only significantly reduces the fatigue life of welded corrugated pipes, but also may cause local stress concentration, thereby inducing cracks, leaks, and even sudden failures. Therefore, before the batch production of welded corrugated pipes, the tensile-compression reciprocating life under lateral deviation must be systematically tested to verify their reliability and durability under complex working conditions.

[0003] Welded corrugated pipes are widely used in industrial applications to compensate for thermal expansion and contraction of pipeline systems. However, welded corrugated pipes may experience lateral deviation during manufacturing and use, which can affect their performance and service life. Therefore, before producing welded corrugated pipes, it is necessary to test their lateral deviation tensile and compression reciprocating life. However, existing equipment can only meet the requirements of axial single reciprocating test and cannot achieve lateral deviation test. SUMMARY

[0004] The purpose of the present application is to provide a corrugated pipe lateral performance test device to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a corrugated pipe lateral performance test device, comprising two displacement plates moving along the longitudinal and transverse directions respectively, a mounting rack is fixedly arranged on the displacement plate, a mounting plate is fixedly arranged on the mounting rack, the opposite sides of the two mounting plates are respectively connected with the left and right ends of the welded corrugated pipe, the mounting plate on the right side is provided with a left-right through vacuum hole communicating with the welded corrugated pipe, the left and right ends of the welded corrugated pipe are fixedly provided with pipe flanges, a sealing assembly is arranged on the opposite side walls of the two mounting plates, the sealing assembly comprises an isolation pipe fixedly connected with the mounting plate and sleeved on the outside of the pipe flange, a circular ring suction cup abutting against the pipe flange, a guide pipe fixedly connected with the mounting plate and sleeved in the pipe flange, an adapter pipe communicating with the circular ring suction cup and the guide pipe respectively, and a circular ring piston slidingly matched with the inner wall of the isolation pipe; the side wall of the pipe flange away from the mounting plate is bonded with the circular ring piston through double-sided butyl tape, and the double-sided butyl tape seals the flange hole of the pipe flange.

[0006] Optionally, the circular ring suction cup comprises a circular ring base fixedly connected with the mounting plate, a circular ring suction cup nozzle integrally formed with the circular ring base, a first circular ring air bag and a second circular ring air bag fixedly connected with the circular ring suction cup nozzle and arranged in an inner and outer concentric circle, a first sealing lip fixedly connected with the first circular ring air bag, and a second sealing lip fixedly connected with the second circular ring air bag; 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 circular ring air bag and the second circular ring air bag are the same in structure, the surface of the first circular ring air bag close to the circular ring suction cup nozzle and the surface of the first circular ring air bag close to the first sealing lip are both flat surfaces, the inner edge of the first circular ring air bag is a circular arc surface protruding inward, and the outer edge of the first circular ring air bag is a circular arc surface protruding outward.

[0008] Optionally, the first circular ring air bag is internally provided with an air bag cavity, the cross section of the air bag cavity is circular or elliptical, and the air pressure in the air bag cavity is standard atmospheric pressure.

[0009] Optionally, a plurality of adapter pipes are arranged in a ring shape and uniformly about the center of the circular ring suction cup, the adapter pipe penetrates into the sidewall of the circular ring base and is provided with an air hole, and the air hole is in alignment with the flange hole of the pipe flange.

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

[0011] Optionally, the test platform is provided with a vertical installation stand and a horizontal displacement mechanism fixedly arranged on the left and right sides of the upper surface of the test platform, a longitudinal displacement mechanism fixedly arranged on the right side of the vertical installation stand, and a displacement plate fixedly connected with the right surface of the displacement end of the longitudinal displacement mechanism and the upper surface of the displacement end of the horizontal displacement mechanism.

[0012] Optionally, the mounting frame comprises a horizontal plate and two vertical rib plates fixedly arranged on the upper surface of the horizontal plate and arranged in parallel in the front-rear direction; the front and rear ends of the displacement plate on the left side are fixedly connected with the two vertical rib plates of the mounting frame on the left side, the upper surface of the displacement plate on the right side is fixedly connected with the lower surface of the horizontal plate of the mounting frame on the right side, and the front and rear ends of the mounting plate are fixedly connected with the two vertical rib plates.

[0013] Compared with the prior art, the present application has the following advantages:

[0014] 1. The application is simple to install and easy to disassemble. The sealing assembly can detachably fix the welded corrugated pipe on the mounting plate, achieve good sealing effect, effectively maintain the vacuum degree in the welded corrugated pipe, and improve the reliability of the test.

[0015] 2. The application completes vacuum establishment and pipe flange locking according to the three-stage sequence of "pre-vacuum - main vacuum - dynamic sealing reinforcement". First, axial positioning, then overall adsorption, and finally self-adaptive compression, completely eliminating the micro-slippage of the pipe flange in the lateral fatigue test. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a structural schematic diagram of the application;

[0017] Figure 2 The figure is a structural schematic diagram of the mounting rack, mounting plate, sealing assembly and pipe flange in the application;

[0018] Figure 3 The figure is Figure 2 The figure is a front view of the sealing assembly and pipe flange;

[0019] Figure 4 The figure is Figure 3 The figure is a structural schematic diagram of section A-A;

[0020] Figure 5 The figure is a half-section view of the circular ring suction cup in the application.

[0021] In the figure: 1, test platform; 2, vertical mounting stand; 3, longitudinal displacement mechanism; 4, transverse displacement mechanism; 5, displacement plate; 6, mounting rack; 7, mounting plate; 8, vacuum hole; 9, sealing assembly; 10, isolation circular pipe; 11, circular ring suction cup; 12, guide circular pipe; 13, adapter pipe; 14, circular ring piston; 15, double-sided butyl tape; 16, circular ring base; 17, circular ring suction cup nozzle; 18, first circular ring air bag; 19, first sealing lip; 20, second circular ring air bag; 21, second sealing lip; 22, air hole; 23, transverse plate; 24, vertical rib plate; 25, welded corrugated pipe; 26, pipe flange. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0023] Embodiment: Please refer to Figures 1 to 2The application provides a corrugated pipe lateral performance testing device, which comprises a test platform 1, vertical installation vertical plates 2 and a horizontal displacement mechanism 4 are fixedly arranged on the left and right sides of the upper surface of the test platform 1, a longitudinal displacement mechanism 3 is fixedly arranged on the right side of the vertical installation vertical plate 2, displacement plates 5 are fixedly arranged on the right surface of the displacement end of the longitudinal displacement mechanism 3 and the upper surface of the displacement end of the horizontal displacement mechanism 4, and the longitudinal displacement mechanism 3 and the horizontal displacement mechanism 4 drive the two displacement plates 5 to move along the longitudinal direction and the horizontal direction respectively.

[0024] The mounting frame 6 comprises a horizontal plate 23 and two vertical rib plates 24 which are fixedly arranged on the upper surface of the horizontal plate 23 and arranged in parallel along the front and back directions.

[0025] The longitudinal displacement mechanism 3 and the horizontal displacement mechanism 4 are matched, the accurate displacement adjustment of the welded corrugated pipe 25 in different directions can be realized, the accuracy of the test is ensured, the original equipment can only realize the axial reciprocating motion, and the lateral offset test of the welded corrugated pipe 25 is realized.

[0026] Please refer to Figures 3 to 5 In addition to the above-mentioned embodiment, the sealing assembly 9 comprises an isolation circular pipe 10 which is fixedly connected with the mounting plate 7 and sleeved on the outer side of the pipe flange 26, a circular ring suction disc 11 which abuts against the pipe flange 26, a guide circular pipe 12 which is fixedly connected with the mounting plate 7 and sleeved in the pipe flange 26, an adapter pipe 13 which is in communication with the circular ring suction disc 11 and the guide circular pipe 12 respectively, and a circular ring piston 14 which is in sliding fit with the inner wall of the isolation circular pipe 10; the side wall of the pipe flange 26 which is away from the mounting plate 7 is bonded with the circular ring piston 14 through double-sided butyl tape 15, the double-sided butyl tape 15 has a circular ring structure, the thickness of the double-sided butyl tape 15 is 0.8-1.2 mm, and the double-sided butyl tape 15 seals the flange hole of the pipe flange 26.

[0027] On the basis of the above-mentioned embodiments, the circular ring suction cup 11 in the present embodiment comprises a circular ring base 16 fixedly connected with the mounting plate 7, a circular ring suction cup nozzle 17 integrally formed with the circular ring base 16, a first circular ring air bag 18 and a second circular ring air bag 20 fixedly connected with the circular ring suction cup nozzle 17 and arranged in an inner and outer concentric circle, a first sealing lip 19 fixedly connected with the first circular ring air bag 18, and a second sealing lip 21 fixedly connected with the second circular ring air bag 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 circular ring air bag 18 and the second circular ring air bag 20 are the same in structure, the surface of the first circular ring air bag 18 close to the circular ring suction cup nozzle 17 and the surface of the first circular ring air bag 18 close to the first sealing lip 19 are both flat surfaces, the inner edge of the first circular ring air bag 18 is a circular arc surface protruding inward, and the outer edge of the first circular ring air bag 18 is a circular arc surface protruding outward. The first circular ring air bag 18 is internally provided with an air bag cavity, the cross section of the air bag cavity is circular or elliptical, and the air pressure in the air bag cavity is standard atmospheric pressure.

[0028] In the sealing assembly 9, the first sealing lip 19, the second sealing lip 21 and the pipe flange 26 provide the first sealing, the circular ring piston 14, the double-sided butyl tape 15 and the pipe flange 26 provide the second sealing, and the present application realizes the double sealing of the pipe flange 26. On the basis of the above-mentioned embodiments, the present embodiment is provided with a plurality of adapter pipes 13, the plurality of adapter pipes 13 are arranged in a ring shape and uniformly about the center of the circular ring suction cup 11, the adapter pipe 13 is provided with an air hole 22 penetratingly extending into the sidewall of the circular ring base 16, the air hole 22 is in alignment with the flange hole of the pipe flange 26, and the adapter pipe 13 can well perform vacuumizing on the sealing assembly 9.

[0029] Before the lateral offset life test of the welded corrugated pipe 25 is performed, the present application completes the vacuum establishment and the locking of the pipe flange 26 according to the three-stage sequence of “pre-vacuumizing-main vacuumizing-dynamic sealing strengthening”, and the specific process is as follows:

[0030] In the pre-vacuumizing stage, the external vacuum unit first performs rough vacuumizing on the inner cavity of the isolation circular pipe 10 through the vacuumizing hole 8, so that the internal pressure rapidly drops to the set negative pressure value. Under the action of the negative pressure, the circular ring piston 14 slides together with the pipe flange 26 temporarily bonded by the double-sided butyl tape 15 to the mounting plate 7, until the end surface of the circular ring suction cup 11 preliminarily adheres to the pipe flange 26, realizing the axial pre-positioning.

[0031] In the main vacuum stage, the vacuum unit continues to work, and the negative pressure range is extended to the inner cavity of the circular ring chuck 11. The negative pressure in the inner cavity of the circular ring chuck 11 causes the chuck surface to generate uniform adsorption force, so that the pipe flange 26 is tightly pulled and kept in the concentric position of the sealing assembly 9, and the axial locking of the welded bellows 25 is completed. At the same time, the continuous channel formed by the guide circular pipe 12 and the adapter pipe 13 ensures that the negative pressure is uniformly distributed on both sides of the pipe flange 26, avoiding local stress concentration.

[0032] In the dynamic sealing strengthening stage, during the continuous vacuum process, the internal pressure of the air bag cavities of the first circular ring air bag 18 and the second circular ring air bag 20 is always equal to the standard atmospheric pressure, and the external pressure is gradually reduced, thereby generating an external pressure difference to make the two air bags expand outward synchronously. The expanded air bags press the first sealing lip 19 and the second sealing lip 21 respectively, so that the two sealing lips are deformed radially and tightly adhere to the pipe flange 26, thereby further improving the effect of the circular ring chuck 11 tightly adsorbing the pipe flange 26, and better fixing the welded bellows 25.

[0033] The present application completes the vacuum establishment and pipe flange 26 locking according to the three-stage sequence of "pre-vacuum-main vacuum-dynamic sealing strengthening", first axial positioning, then overall adsorption, and finally self-adaptive compression, which completely eliminates the micro-slip of the pipe flange 26 in the lateral fatigue test. The entire vacuum process is essentially a process of establishing and maintaining vacuum inside the welded bellows 25. During the lateral offset test, the pressure change in the welded bellows 25 is monitored in real time to evaluate the sealing performance and service life of the welded bellows 25. If the pressure in the welded bellows 25 increases, it indicates that the welded bellows 25 has a leakage problem. The present application can effectively evaluate the sealing performance and service life of the welded bellows 25 in this way.

[0034] Although embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application 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).

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