A fatigue damage test device for bellows of GIS equipment

Abstract

The present invention discloses a fatigue damage test device for bellows of GIS equipment. During operation, the stress and strain of the bellows on the GIS equipment will change with the temperature difference throughout the year. Within a day, the stress and strain conditions during the day and at night will be completely different. The present invention is provided with driving force by two servo motors, and two sets of crank slider mechanisms are formed by components such as a turntable, a connecting rod, and a drag plate to realize the periodic reciprocating motion of the drag plate. The two sets of crank slider mechanisms can simulate the deformation of the bellows of the GIS equipment caused by the temperature change within a day and throughout the year separately or simultaneously. At the same time, the force on the bellows can be measured by a sensor, the fatigue damage mechanism of the bellows can be studied, and the fatigue life can be predicted. The present invention has a simple structure and safe operation, and can realize a variety of sample tests such as bellows and springs. It has a low cost and is easy to promote.

Description

Technical Field

[0001] The invention relates to the technical field of fatigue testing of electric equipment, in particular to a fatigue damage testing device for a bellows of a GIS equipment. Background Art

[0002] In the gas-insulated metal-enclosed switch GIS equipment, the metal bellows expansion joint is an important component used to connect two pipeline busbars. It is mainly used to compensate for the size change of the pipeline busbar caused by thermal expansion and contraction, absorb the energy caused by axial vibration during operation, and adjust the spatial size of the pipeline busbar. Its effect is similar to that of a spring. Therefore, the metal bellows expansion joint is a key component to ensure the safety and health of the equipment in the application of GIS electrical equipment.

[0003] The general composition of the metal bellows expansion joint of GIS equipment is as follows: bellows, connecting pipes, gaskets, flanges, studs, nuts and other components, among which the bellows is the core component and also the deformable component. Most manufacturers use austenitic stainless steel when making metal bellows. Metal bellows will be subjected to cyclic loads in actual working conditions, but the stress of each part is not uniform. The stress in some local areas will be more concentrated and often in the plastic stress zone. In this way, fatigue damage is likely to occur at a lower number of cycles, which is a typical low-cycle fatigue component. Therefore, it is of great practical significance and practical guidance to study the stress state, material damage mechanism and fatigue damage test method of bellows.

[0004] During the operation of the bellows on GIS equipment, the stress and strain will change with the temperature difference throughout the year. Within a day, the stress and strain during the day and at night will be completely different. Therefore, designing a test device that can truly simulate the fatigue damage of the bellows caused by temperature changes throughout the year and during the day and at night has important practical significance for studying the stress state, fatigue damage mechanism and fatigue life prediction of the bellows. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned prior art and provide a GIS equipment bellows fatigue damage test device for truly simulating the fatigue damage of GIS equipment bellows caused by temperature fluctuations throughout the year and daily.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a GIS equipment bellows fatigue damage test device, which includes a mobile platform, a fixed workbench, a rack and a platform located on the top of the rack;

[0007] The mobile platform comprises a large carriage and a small carriage, wherein the large carriage is movably connected to the platform and can slide freely relative to the platform; the large carriage is movably connected to the small carriage and can slide freely relative to the large carriage;

[0008] The upper surface of the large carriage is fixedly connected to a daily servo motor, the daily servo motor is connected to a daily turntable, the daily turntable is connected to one end of a small carriage connecting rod, the other end of the small carriage connecting rod is connected to the small carriage shaft, the daily turntable, the small carriage connecting rod and the small carriage form a crank slider mechanism; a lead screw support plate is fixed on the small carriage and movably connected to the sample adjustment platform, the sample adjustment platform fixes a fixture support plate, the lead screw support plate has a hole and cooperates with the lead screw, one end of the lead screw is connected to the fixture support plate, and the other end is fixed with a hand wheel, and the position of the sample adjustment platform is manually controlled by adjusting the hand wheel; the fixture support plate is fixed to the first fixture by bolts;

[0009] The fixed workbench includes a sensor sliding support plate, a sensor fixed support plate and a force sensor, wherein the sensor sliding support plate is connected to the platform through a dovetail groove and can slide freely relative to the platform, and one side of the sensor sliding support plate is connected to the second clamp through a bolt, and the first clamp and the second clamp are respectively used to clamp the two ends of the sample; the bottom of the sensor fixed support plate is fixed on the platform; the force sensor is connected to the sensor sliding support plate and the sensor fixed support plate through a bolt rod;

[0010] A servo motor support plate is fixed on the lower surface of the platform, a servo motor is fixed on the servo motor support plate, the servo motor is connected to a turntable, the turntable is connected to a large drag plate connecting rod, the other end of the large drag plate connecting rod is axially connected to the lower surface of the large drag plate, the turntable, the large drag rod connecting rod and the large drag plate also constitute a crank slider mechanism.

[0011] Furthermore, the day turntable is connected to the small drag plate connecting rod by a first connecting rod rotating shaft, and 2-10 groups of symmetrical through holes are opened on the disk surface of the day turntable. The first connecting rod rotating shaft includes a swivel, two symmetrical through holes opened on both sides of the swivel and a first rotating shaft connected to the middle of the swivel. One group of symmetrical through holes on the disk surface of the day turntable is connected to the two symmetrical through holes on the first connecting rod rotating shaft by bolts.

[0012] Furthermore, the annual turntable is connected to the large drag plate connecting rod by a second connecting rod shaft, and 2-10 groups of symmetrical through holes are opened on the disk surface of the annual turntable. The second connecting rod shaft includes a swivel, two symmetrical through holes opened on both sides of the swivel and a shaft connected to the middle of the swivel. One group of symmetrical through holes on the disk surface of the annual turntable is connected to two symmetrical through holes on the second connecting rod shaft by bolts.

[0013] Furthermore, the day servo motor is fixed on a day servo motor support plate by bolts, the day servo motor support plate is fixed on the upper surface of the large carriage, and the day servo motor shaft is connected to the day turntable by a key.

[0014] Furthermore, the servo motor is fixed to a servo motor support plate by bolts, the servo motor support plate is fixed to the bottom surface of the platform, and the servo motor shaft is connected to the turntable by a key.

[0015] Furthermore, two first guide rails are provided on the upper surface of the small carriage, and two groups of first sliders are provided at the bottom of the sample adjustment platform, each group of first sliders has at least two sliders, and the first sliders are sleeved on the first guide rails and can move axially relative to the small carriage along the first guide rails.

[0016] Furthermore, two second guide rails are provided on the upper surface of the large carriage, and two groups of second sliders are provided on the lower surface of the small carriage. Each group of second sliders has at least two sliders. The second sliders are sleeved on the second guide rails and can move axially relative to the large carriage along the second guide rails.

[0017] Furthermore, two third guide rails are provided on the lower surface of the platform, and two groups of third sliders are provided on the upper surface of the large slide plate, each group of third sliders has at least two sliders, and the third sliders are sleeved on the third guide rails and can move axially relative to the platform along the third guide rails.

[0018] Furthermore, the force sensor is S-shaped.

[0019] Furthermore, the sample is a partial sample of a bellows with 3-5 waves and a length of 100-200 mm. The present invention is also applicable to springs.

[0020] Furthermore, the first clamp comprises an I-shaped structural member and a cover plate with bolt holes at the front and rear ends, the end with a larger area is fastened to the clamp support plate by bolts, the end with a smaller area is connected to the cover plate by bolts, and the middle is used to clamp the sample; the second clamp comprises an I-shaped structural member and a cover plate with bolt holes at the front and rear ends, the end with a larger area is fastened to the sensor sliding support plate by bolts, the end with a smaller area is connected to the cover plate by bolts, and the middle is used to clamp the sample.

[0021] The present invention uses two servo motors to provide driving force, and forms two sets of crank slider mechanisms through components such as a turntable, a connecting rod, and a drag plate to realize the periodic reciprocating motion of the drag plate. The two sets of crank slider mechanisms can simulate the dimensional changes of the bellows caused by temperature changes within a day and throughout the year separately or simultaneously. At the same time, the stress state of the bellows can be measured by a sensor, the fatigue damage mechanism of the bellows can be studied, and the fatigue life can be predicted.

[0022] The invention has a simple structure and is safe to operate, can realize various sample tests such as bellows and springs, has a low cost and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a front view of the present invention;

[0025] Figure 3 A bottom view of the present invention;

[0026] Figure 4 A schematic diagram of the frame structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the part simulating annual reciprocating motion of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the part simulating the day reciprocating motion of the present invention;

[0029] Figure 7 It is a schematic diagram of the fixture and the sample of the present invention;

[0030] Figure 8 It is a schematic diagram of the clamp structure of the present invention;

[0031] Fig. 9 It is a schematic diagram of a turntable of the present invention;

[0032] Fig.10 It is a schematic diagram of the connecting rod shaft structure of the present invention.

[0033] Among them, 1. frame, 2. platform, 3. hand wheel, 4. small slide connecting rod, 5. screw support plate, 6. screw, 7. daily turntable, 8. fixture support plate, 9. specimen, 10. specimen adjustment table, 11. first fixture, 12. small slide, 13. sensor sliding support plate, 14. force sensor, 15. sensor fixed support plate, 16. first guide rail, 17. daily servo motor support plate, 18. daily servo motor, 19. annual turntable, 20. first connecting rod shaft, 21. large slide, 22. annual servo motor, 23. large slide connecting rod, 24. second fixture, 25. second connecting rod shaft, 26. annual servo motor support plate, 27-first slider, 28. second guide rail, 29. second slider, 30. third guide rail, 31. third slider. DETAILED DESCRIPTION

[0034] In order to deepen the understanding of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0035] like Figure 1-10 The device shown is a GIS equipment bellows fatigue damage test device, which comprises a mobile platform, a fixed workbench, a frame 1 and a platform 2 located on the top of the frame.

[0036] The mobile platform includes a large carriage 21 and a small carriage 12. The large carriage 21 is movably connected to the platform 2 and can slide freely relative to the platform 2. The large carriage 21 is movably connected to the small carriage 12 and can slide freely relative to the large carriage 21.

[0037] The upper surface of the large carriage 21 is fixedly connected to the daily servo motor 18, the daily servo motor 18 is connected to the daily turntable 7, the daily turntable 7 is connected to one end of the small carriage connecting rod 4, the other end of the small carriage connecting rod 4 is axially connected to the small carriage 12, and the daily turntable 7, the small carriage connecting rod 4 and the small carriage 12 constitute a crank slider mechanism. The small carriage 12 is fixed with a lead screw support plate 5 and movably connected with a sample adjustment platform 10, the sample adjustment platform 10 fixes the fixture support plate 8, the lead screw support plate 5 is opened with a nut to cooperate with the lead screw 6, one end of the lead screw 6 is connected to the fixture support plate 8, and the other end is fixed with a hand wheel 3, and the position of the sample adjustment platform 10 is manually controlled by adjusting the hand wheel 3; the fixture support plate 8 is fixed with a first fixture 11 by bolts.

[0038] The fixed workbench includes a sensor sliding support plate 13, a sensor fixed support plate 15 and an S-shaped force sensor 14. The sensor sliding support plate 13 is connected to the platform 2 through a dovetail groove and can slide freely relative to the platform 2. One side of the sensor sliding support plate 13 is connected to the second clamp 24 through a bolt. The first clamp 11 and the second clamp 24 are respectively used to clamp the two ends of the sample 9; the sample 9 is a 3-5 wave corrugated pipe shearing local sample with a length of 100-200mm. The bottom of the sensor fixed support plate 15 is fixed on the platform 2; the force sensor 14 is connected to the sensor sliding support plate 13 and the sensor fixed support plate 15 through a bolt rod.

[0039] A servo motor support plate 26 is fixed to the lower surface of the platform 2, and a servo motor 22 is fixed on the servo motor support plate 26. The servo motor 22 is connected to a turntable 19, and the turntable 19 is connected to a large drag plate connecting rod 23. The other end of the large drag plate connecting rod 23 is axially connected to the lower surface of the large drag plate 21. The turntable 19, the large drag rod connecting rod 23 and the large drag plate 21 also constitute a crank slider mechanism.

[0040] The day turntable 7 is connected to the small carriage connecting rod 4 by a first connecting rod rotating shaft 20. Eight groups of symmetrical through holes are opened on the disk surface of the day turntable 7. The first connecting rod rotating shaft 20 includes a swivel, two symmetrical through holes opened on both sides of the swivel and a rotating shaft connected to the middle of the swivel. One group of symmetrical through holes on the disk surface of the day turntable 7 is connected to two symmetrical through holes on the first connecting rod rotating shaft 20 by bolts.

[0041] The annual turntable 19 is connected to the large drag plate connecting rod 23 by a second connecting rod shaft 25. Eight groups of symmetrical through holes are opened on the disk surface of the annual turntable 19. The second connecting rod shaft 25 includes a swivel, two symmetrical through holes opened on both sides of the swivel and a shaft connected to the middle of the swivel. One group of symmetrical through holes on the disk surface of the annual turntable is connected to two symmetrical through holes on the second connecting rod shaft by bolts.

[0042] The day servo motor 18 is fixed on the day servo motor support plate 17 by bolts, and the day servo motor support plate 17 is fixed on the upper surface of the large carriage 21. The shaft of the day servo motor 18 is connected to the day turntable 7 through a key.

[0043] The servo motor 22 is fixed to the servo motor support plate 26 by bolts, and the servo motor support plate 26 is fixed to the bottom surface of the platform 2. The shaft of the servo motor 22 is connected to the turntable 19 by a key.

[0044] Two first guide rails 16 are provided on the upper surface of the small carriage 12 , and two groups of first sliders 27 are provided at the bottom of the sample adjustment platform 10 . Each group of first sliders 27 has at least two sliders. The first sliders 27 are sleeved on the first guide rails 16 and can move axially along the first guide rails 16 .

[0045] Two second guide rails 28 are provided on the upper surface of the large carriage 21 , and two groups of second sliders 29 are provided on the lower surface of the small carriage 12 . Each group of second sliders 29 has at least two sliders. The second sliders 29 are sleeved on the second guide rails 28 and can move axially along the second guide rails 28 .

[0046] The first fixture 11 includes an I-shaped structural member and a cover plate with bolt holes at both the front and rear ends, the end with a larger area is fastened to the fixture support plate 8 by bolts, the end with a smaller area is connected to the cover plate by bolts, and the middle is used to clamp the sample. The second fixture 24 includes an I-shaped structural member and a cover plate with bolt holes at both the front and rear ends, the end with a larger area is fastened to the sensor sliding support plate 13 by bolts, the end with a smaller area is connected to the cover plate by bolts, and the middle is used to clamp the sample.

[0047] When the present invention is used to perform fatigue damage test on the bellows of GIS equipment, the bellows to be tested are sampled, and a 5-wave bellows with a length of 200 mm and a width of 50 mm is cut. The hand wheel 3 is rotated to drive the lead screw 6, so that the sample adjustment table 10 and the fixture support plate 8 fixed thereon are moved along the first guide rail 16 to a distance of 200 mm from the sensor sliding support plate 13. The two ends of the bellows are clamped into the first fixture 11 and the second fixture 24 with a smaller area, and locked with 4 sets of bolts and nuts. The two fixtures are fixed to the fixture support plate 8 and the sensor sliding support plate 13 respectively with bolts and nuts. The S-type force sensor 14 is fixed between the sensor fixed support plate 15 and the sensor sliding support plate 13 with bolts. The first connecting rod shaft 20 is fixed to the outermost edge of the day turntable 7 by bolt connection, and the small drag plate connecting rod 4 is connected to the day turntable 7 and the small drag plate 12. The year turntable 19 and the large drag plate 21 are connected in the same way. The daily servo motor 18 and the annual servo motor 22 are turned on and input signals. The daily servo motor 18 drives the daily turntable 7 to rotate, and drives the small carriage 12 on the large carriage 21 along the first guide rail 16 through the small carriage connecting rod 4 to reciprocate forward and backward. At this time, the bellows sample 9 is pulled forward and backward, realizing the simulation of the length change of the sample 9 caused by the daily temperature change.

[0048] The year servo motor 22 drives the year turntable 19 to rotate, and the large carriage 21 is driven to reciprocate relative to the platform 2 through the large carriage connecting rod 23, so as to simulate the length change of the sample 9 caused by the year temperature change. During the experiment, the sample 9 drives the sensor sliding support plate 13 to slide slightly on the dovetail groove, pulling the S-type force sensor 14 to generate the force data of the sample 9. After the complete experimental cycle is over, turn off the year servo motor 22 and the day servo motor 18, loosen the first clamp 11 and the second clamp 24, remove the sample 9, dismantle the first clamp 11 and the second clamp 24, and check the equipment.

[0049] According to the temperature fluctuation curve of the area where the GIS equipment is located throughout the year, the average of the daily maximum temperature and the daily minimum temperature throughout the year is taken; the daily temperature changes from the lowest value to the highest value and from the highest value to the lowest value in the time period according to the sine law. The daily temperature fitting formula is:

[0050]

[0051] Where: x is hour, 0≤x<24, y is temperature, initial phase |φ|<π, amplitude A>0;

[0052] Daily temperature change cycle: 24 hours;

[0053] Daily temperature variation amplitude:

[0054] Daily temperature variation deviation:

[0055] Initial phase of daily temperature change: X i The time corresponding to the minimum daily average temperature.

[0056] According to the temperature fluctuation curve of the area where the GIS equipment is located throughout the year, the annual maximum temperature and annual minimum temperature are taken; the annual minimum value to the maximum value changes according to the sine law on the time axis. The daily temperature fluctuation fitting is similar to the annual temperature fluctuation fitting.

[0057] The real fluctuation of temperature can be simulated by superimposing two sine waves. The daily cycle is 24 hours and the annual cycle is 12 months. During the fatigue simulation test, the speed of the annual servo motor and the daily servo motor is set so that the speed of the daily servo motor is 365 times that of the annual servo motor.

[0058] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. A GIS equipment bellows fatigue damage test device, characterized in that: It comprises a mobile platform, a fixed workbench, a frame (1) and a platform (2) located on the top of the frame; The mobile platform comprises a large carriage (21) and a small carriage (12); the large carriage (21) is movably connected to the platform (2), and the large carriage (21) can slide freely relative to the platform (2); the large carriage (21) is movably connected to the small carriage (12), and the small carriage (12) can slide freely relative to the large carriage (21); The upper surface of the large carriage (21) is fixedly connected to a daily servo motor (18), the daily servo motor (18) is connected to a daily rotating disk (7), the daily rotating disk (7) is connected to one end of a small carriage connecting rod (4), the other end of the small carriage connecting rod (4) is axially connected to a small carriage (12), the daily rotating disk (7), the small carriage connecting rod (4) and the small carriage (12) constitute a crank slider mechanism; a lead screw support plate (5) is fixed on the small carriage (12) and is movably connected to a sample adjustment platform (10), the sample adjustment platform (10) is fixed to a fixture support plate (8), the lead screw support plate (5) is opened and cooperates with a lead screw (6), one end of the lead screw (6) is connected to the fixture support plate (8), and the other end is fixed to a hand wheel (3), and the position of the sample adjustment platform (10) is manually controlled by adjusting the hand wheel (3); the fixture support plate (8) is fixed to the first fixture (11) by bolts; The fixed workbench comprises a sensor sliding support plate (13), a sensor fixed support plate (15) and a force sensor (14); the sensor sliding support plate (13) is connected to the platform (2) via a dovetail groove and can slide freely relative to the platform (2); one side of the sensor sliding support plate (13) is connected to a second clamp (24) via a bolt; the first clamp (11) and the second clamp (24) are respectively used to clamp two ends of the sample (9); the bottom of the sensor fixed support plate (15) is fixed on the platform (2); the force sensor (14) is connected to the sensor sliding support plate (13) and the sensor fixed support plate (15) via a bolt rod; A year servo motor support plate (26) is fixed on the lower surface of the platform (2), a year servo motor (22) is fixed on the year servo motor support plate (26), the year servo motor (22) is connected to the year turntable (19), the year turntable (19) is connected to the large carriage connecting rod (23), the other end of the large carriage connecting rod (23) is axially connected to the lower surface of the large carriage (21), and the year turntable (19), the large carriage connecting rod (23) and the large carriage (21) also constitute a crank slider mechanism; The day turntable (7) is connected to the small carriage connecting rod (4) by a first connecting rod rotating shaft (20), 2-10 groups of symmetrical through holes are opened on the disk surface of the day turntable (7), the first connecting rod rotating shaft (20) comprises a rotating body, two symmetrical through holes opened on both sides of the rotating body and a rotating shaft connected to the middle of the rotating body, and one group of symmetrical through holes on the disk surface of the day turntable (7) is connected to the two symmetrical through holes on the first connecting rod rotating shaft (20) by bolts; The year turntable (19) is connected to the large drag plate connecting rod (23) by a second connecting rod rotating shaft (25), 2-10 groups of symmetrical through holes are opened on the disk surface of the year turntable (19), the second connecting rod rotating shaft (25) comprises a swivel, two symmetrical through holes opened on both sides of the swivel and a rotating shaft connected to the middle of the swivel, and one group of symmetrical through holes on the disk surface of the year turntable (19) is connected to the two symmetrical through holes on the second connecting rod rotating shaft by bolts.

2. A GIS equipment bellows fatigue damage test device according to claim 1, characterized in that: The day servo motor (18) is fixed on the day servo motor support plate (17) by bolts. The day servo motor support plate (17) is fixed on the upper surface of the large carriage (21). The shaft of the day servo motor (18) is connected to the day turntable (7) through a key.

3. A GIS equipment bellows fatigue damage test device according to claim 1, characterized in that: The annual servo motor (22) is fixed on the annual servo motor support plate (26) by bolts, and the annual servo motor support plate (26) is fixed on the bottom surface of the platform (2). The shaft of the annual servo motor (22) is connected to the annual turntable (19) through a key.

4. A GIS equipment bellows fatigue damage test device according to claim 1, characterized in that: The upper surface of the small carriage (12) is provided with two first guide rails (16), and the bottom of the sample adjustment platform (10) is provided with two groups of first sliders (27), each group of first sliders (27) has at least two first sliders, and the first sliders (27) are sleeved on the first guide rails (16) and can move axially relative to the small carriage along the first guide rails (16).

5. The GIS equipment bellows fatigue damage test device according to claim 1 is characterized in that: The upper surface of the large carriage (21) is provided with two second guide rails (28), and the lower surface of the small carriage (12) is provided with two groups of second sliders (29), each group of second sliders (29) having at least two sliders. The second sliders (29) are sleeved on the second guide rails (28) and can move axially relative to the large carriage along the second guide rails (28).

6. A GIS equipment bellows fatigue damage test device according to claim 1, characterized in that: The lower surface of the platform (2) is provided with two third guide rails (30), and the upper surface of the large carriage (21) is provided with two groups of third sliders (31), each group of third sliders (31) has at least two sliders, and the third sliders (31) are sleeved on the third guide rails (30) and can move axially relative to the platform along the third guide rails (30).

7. The GIS equipment bellows fatigue damage test device according to claim 1 is characterized in that: The sample (9) is a partial sample of a corrugated pipe with 3-5 waves and a length of 100-200 mm.

8. The GIS equipment bellows fatigue damage test device according to claim 1 is characterized in that: The first clamp (11) comprises an I-shaped structural member and a cover plate with bolt holes at both the front and rear ends, wherein the end with a larger area is fastened to the clamp support plate (8) by bolts, the end with a smaller area is connected to the cover plate by bolts, and the middle is used to clamp the sample; the second clamp (24) comprises an I-shaped structural member and a cover plate with bolt holes at both the front and rear ends, wherein the end with a larger area is fastened to the sensor sliding support plate (13) by bolts, the end with a smaller area is connected to the cover plate by bolts, and the middle is used to clamp the sample.

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