Metal bellows fatigue testing machine and operating method thereof

Abstract

The present invention relates to a metal bellows fatigue testing machine, comprising a first vertical plate, a second vertical plate and a third vertical plate which are parallel to each other and connected by a guide rod, and heating elements are installed on the first vertical plate and the second vertical plate; a bellows is installed between the first vertical plate and the second vertical plate; the first vertical plate is connected to a first driving mechanism, and the first driving mechanism drives the bellows to twist; the second vertical plate is connected to a second driving mechanism, and the second driving mechanism drives the bellows to move radially; the third vertical plate is connected to a third driving mechanism, and the third driving mechanism drives the bellows to move axially. During the operation of the present invention, the detection accuracy and detection efficiency meet the detection requirements, and the air pressure system operates reliably, and the detection working accuracy and various technical indicators meet the detection requirements.

Description

Technical Field

[0001] The invention relates to the technical field of detection devices, and in particular to a metal bellows fatigue testing machine and an operating method thereof. Background Art

[0002] Metal bellows are widely used in various technical fields, especially in various measuring instruments. Their main purpose is to be used as measuring elements in pressure, temperature, flow and other instruments, which are converted into indicators such as pressure, temperature and flow through changes in displacement, force or volume. The quality of their production is directly related to the accuracy of the measurement, affecting the performance and execution functions of the instruments. In the design and use of metal bellows, sealing and service life are important technical indicators. In the production process inspection, fatigue resistance tests are required for each batch of products to ensure the quality of the products. Generally, companies produce more batches and types of bellows, while traditional metal bellows fatigue testing machines are single bellows fatigue tests, which can only test one type of bellows, and the test efficiency is relatively low. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention discloses a metal bellows fatigue testing machine and an operating method thereof.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A metal bellows fatigue testing machine comprises a first vertical plate, a second vertical plate and a third vertical plate which are parallel to each other and connected by a guide rod, and heating elements are installed on the first vertical plate and the second vertical plate; a bellows is installed between the first vertical plate and the second vertical plate; the first vertical plate is connected to a first driving mechanism, and the first driving mechanism drives the bellows to twist; the second vertical plate is connected to a second driving mechanism, and the second driving mechanism drives the bellows to move radially; the third vertical plate is connected to a third driving mechanism, and the third driving mechanism drives the bellows to move axially.

[0006] Its further technical features are: a first fixed plate is installed in the first vertical plate, the first driving mechanism includes a first cylinder, the first cylinder is installed on a first fixed seat, the piston rod of the first cylinder is connected to a first connecting rod, a first joint bearing is installed at one end of the first connecting rod, the center of the first joint bearing passes through a first guide rod, and the first guide rod is fixed to the first fixed plate.

[0007] Its further technical feature is that the first fixing plate is provided with a compressed air inlet.

[0008] Its further technical feature is that a temperature sensor is installed on the first fixing plate.

[0009] Its further technical features are: a second fixed plate is installed in the second vertical plate, the second driving mechanism includes a second cylinder, the piston rod of the second cylinder is connected to a second connecting rod, a second spherical bearing is installed at one end of the second connecting rod, and the second spherical bearing is connected to the second fixed plate through a rotating shaft.

[0010] Its further technical feature is that the end of the second cylinder is fixed to the connecting plate, a sliding block is installed at the bottom of the connecting plate, the sliding block and the guide rail are interlocked, and the guide rail is installed on the second fixing seat.

[0011] Its further technical feature is that the third driving mechanism includes a third cylinder, a piston rod of the third cylinder is connected to a third connecting rod, and the third connecting rod passes through the third vertical plate and is connected to the second vertical plate.

[0012] Its further technical feature is that the distance between the first vertical plate and the second vertical plate is adjustable, and the corrugated pipe is flange-connected to the first vertical plate and the second vertical plate respectively.

[0013] Its further technical feature is that the first vertical plate and the third vertical plate are both installed on a workbench.

[0014] A method for operating a metal bellows fatigue testing machine comprises the following steps:

[0015] Step S1: installing the corrugated pipe between the first vertical plate and the second vertical plate;

[0016] Step S2: simultaneously starting the first driving mechanism, the second driving mechanism, the third driving mechanism and the heating unit, wherein the first driving mechanism drives the bellows to twist, the second driving mechanism drives the bellows to move radially, and the third driving mechanism drives the bellows to move axially;

[0017] Step S3: When the number of detections reaches a set value, the first drive mechanism, the second drive mechanism, the third drive mechanism and the heating element are stopped, and detection records of the model and batch of the bellows are kept.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. During the operation of the present invention, the detection accuracy and detection efficiency meet the detection requirements, and the air pressure system operates reliably, and the detection working accuracy and various technical indicators meet the detection requirements.

[0020] 2. The present invention can detect bellows with different expansion and contraction amounts at one time, and can adapt the expansion and contraction displacement of the bellows by adjusting the position of the second vertical plate, thereby realizing multi-wave and different displacement bellows fatigue detection.

[0021] 3. The present invention is suitable for the design of bellows with various models and different expansion and contraction amounts, which greatly increases the detection range and achieves better use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 It is the front view of the present invention.

[0024] Figure 3 It is a side view of the present invention.

[0025] Figure 4 It is a top view of the present invention.

[0026] Figure 5 Schematic diagram of the structure of the second fixed plate.

[0027] Figure 6 It is a structural schematic diagram of the second vertical plate.

[0028] In the figure: 1. first cylinder; 2. first fixed seat; 3. first connecting rod; 4. temperature sensor; 5. heating element; 6. first vertical plate; 7. first fixed plate; 8. compressed air inlet; 9. guide rod; 10. second fixed plate; 1001. first flat plate; 1002. connecting ear seat; 1003. first through hole; 11. second vertical plate; 1101. second flat plate; 1102. second through hole; 12. second connecting rod; 13. guide rail; 14. second fixed seat; 15. second cylinder; 16. third connecting rod; 17. third vertical plate; 18. third cylinder; 19. bellows; 20. air outlet; 21. workbench; 22. fourth connecting rod; 23. bearing seat. DETAILED DESCRIPTION

[0029] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only reference directions of the accompanying drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention. In addition, in all embodiments, the same reference numerals represent the same elements.

[0030] The specific implementation of this embodiment is described below in conjunction with the accompanying drawings.

[0031] Combination Figure 1 to Figure 4A metal bellows fatigue testing machine comprises a first vertical plate 6, a second vertical plate 11 and a third vertical plate 17 which are parallel to each other and connected by a guide rod 9. Specifically, guide holes are provided at the four corners of the first vertical plate 6, the four corners of the second vertical plate 11 and the four corners of the third vertical plate 17, and the positions of the guide holes of the first vertical plate 6, the guide holes of the second vertical plate 11 and the guide holes of the third vertical plate 17 correspond to each other, and the guide rod 9 passes through the guide holes of the first vertical plate 6, the guide holes of the second vertical plate 11 and the guide holes of the third vertical plate 17 in sequence.

[0032] The first vertical plate 6 and the second vertical plate 11 are both installed with a heating element 5. The figure shows the installation position of the heating element 5. Preferably, the heating element 5 is a heating tube. The model and power of the heating tube are selected and adjusted by those skilled in the art according to needs. The first vertical plate 6 and the third vertical plate 17 are both installed on the workbench 21.

[0033] The bellows 19 is installed between the first vertical plate 6 and the second vertical plate 11. The first vertical plate 6 is connected to the first driving mechanism, and the first driving mechanism drives the bellows 19 to twist. The second vertical plate 11 is connected to the second driving mechanism, and the second driving mechanism drives the bellows 19 to move radially. The third vertical plate 17 is connected to the third driving mechanism, and the third driving mechanism drives the bellows 19 to move axially. The first driving mechanism, the second driving mechanism and the third driving mechanism respectively give the bellows 19 radial, axial and torsion tests, and the first driving mechanism, the second driving mechanism and the third driving mechanism are respectively installed with counting units, which can be micro switch transmission counters, and are connected to the PLC control system signal.

[0034] Specifically, the first fixing plate 7 is installed in the first vertical plate 6. The first driving mechanism includes a first cylinder 1, which is installed on the first fixing seat 2, and the piston rod of the first cylinder 1 is connected to the first connecting rod 3, and a first joint bearing is installed at one end of the first connecting rod 3, and the center of the first joint bearing passes through the first guide rod, and the first guide rod is fixed on the first fixing plate 7.

[0035] The first fixing plate 7 is provided with a compressed air inlet 8, which is connected to an air source, and the bellows 19 is provided with an air outlet 20. The first fixing plate 7 is provided with a temperature sensor 4, and the figure shows the installation position of the temperature sensor 4. The temperature sensor 4 is a commercially available product, and its working principle is common knowledge, and can be selected by those skilled in the art according to needs.

[0036] The second fixing plate 10 is installed in the second vertical plate 11, and the second driving mechanism includes a second cylinder 15, a piston rod of the second cylinder 15 is connected to the second connecting rod 12, a second spherical bearing is installed at one end of the second connecting rod 12, and the second spherical bearing is connected to the second fixing plate 10 through a rotating shaft.

[0037] Combination Figure 5 and Figure 6In this embodiment, the second fixing plate 10 includes a first flat plate 1001, a connecting ear seat 1002 is provided at the bottom of the first flat plate 1001, the connecting ear seat 1002 and the first flat plate 1001 are integrally formed, and the first flat plate 1001 has a group of first through holes 1003, and the first through holes 1003 are used to connect with the second vertical plate 11. The second vertical plate 11 includes a second flat plate 1101, a notch is provided at the center of the second flat plate 1101, and the shape of the notch is the same as that of the first flat plate 1001, and the second flat plate 1101 has a group of second through holes 1102, the position of the first through hole 1003 corresponds to the position of the second through hole 1102, and the fixing rod can pass through the first through hole 1003 and the second through hole 1102 in sequence to fix the second fixing plate 10 in the second vertical plate 11.

[0038] The end of the second cylinder 15 is fixed to the connecting plate, the bottom of the connecting plate is installed with a slider, the slider and the guide rail 13 are engaged with each other, and the guide rail 13 is installed on the second fixing seat 14. The slider and the guide rail 13 are used to cooperate with the second vertical plate 11 to move between the first vertical plate 6 and the third vertical plate 17 along the length direction of the guide rod 9.

[0039] The third driving mechanism includes a third cylinder 18 , a piston rod of the third cylinder 18 is connected to a third connecting rod 16 , and the third connecting rod 16 passes through a third vertical plate 17 and is connected to the second vertical plate 11 .

[0040] The operator can adjust the distance between the first vertical plate 6 and the second vertical plate 11 according to the length of the bellows to be tested. Both sides of the bellows 19 are flange-connected to the first vertical plate 6 and the second vertical plate 11 respectively.

[0041] The working principle of the present invention is as follows:

[0042] The bellows 19 to be tested is installed between the first vertical plate 6 and the second vertical plate 11, and the two sides of the bellows 19 are flange-connected to the first vertical plate 6 and the second vertical plate 11 respectively, and the two side planes of the tested bellows 19 are just in contact with the plane of the first vertical plate 6 and the plane of the second vertical plate 11.

[0043] Open the gas source, adjust the gas source output pressure, then open the input stop valve, and adjust the pressure reducing valve, the pressure display value of the output pressure gauge reaches the rated pressure value, then open the output stop valve, and observe whether the tested bellows 19 has any leakage. When ensuring that there is no leakage, turn on the power, reset the value of the phase counting element to zero, start the first drive mechanism, the second drive mechanism, the third drive mechanism and the heating element 5, and start the pressure fatigue test of the bellows 19. Specifically, the piston rod of the first cylinder 1 pushes the first connecting rod 3 to move, and the first connecting rod 3 transmits power to the first fixed plate 7, the piston rod of the second cylinder 15 pushes the second connecting rod 12 to move, and the second connecting rod 12 transmits power to the second fixed plate 10, the piston rod of the third cylinder 18 pushes the third connecting rod 16, and the third connecting rod 16 transmits power to the second fixed plate 10, and the bellows 19 reaches the corresponding rotation speed required by the test.

[0044] During the test, it is necessary to frequently observe whether the equipment and the test product have any abnormal conditions to ensure the normal operation of the test equipment. When the number of detections reaches the rated setting value of the counting element, the first drive mechanism, the second drive mechanism, the third drive mechanism and the heating element 5 are stopped, and the detection records of the product model and batch are kept.

[0045] The metal bellows fatigue testing machine has been used in a company's production. The test data of the same model of bellows 19 are as follows:

[0046]

[0047]

[0048]

[0049] In summary, during the operation of the equipment, the detection accuracy and efficiency meet the detection requirements, and the air pressure system operates reliably, and the detection accuracy and various technical indicators meet the detection requirements. The present invention adapts to the design of bellows 19 of multiple models and different telescopic amounts, greatly increases the detection range, and achieves better use results.

[0050] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. The present invention may be modified in any form without violating the basic structure of the present invention.

Claims

1. A metal bellows fatigue testing machine, characterized in that: The invention comprises a first vertical plate (6), a second vertical plate (11) and a third vertical plate (17) which are parallel to each other and connected via a guide rod (9), and a heating element (5) is installed on both the first vertical plate (6) and the second vertical plate (11); a bellows (19) is installed between the first vertical plate (6) and the second vertical plate (11); the first vertical plate (6) is connected to a first driving mechanism, and the first driving mechanism drives the bellows (19) to rotate; the second vertical plate (11) is connected to a second driving mechanism, and the second driving mechanism drives the bellows (19) to move radially; the third vertical plate (17) is connected to a third driving mechanism, and the third driving mechanism drives the bellows (19) to move axially; A first fixed plate (7) is installed in the first vertical plate (6), the first driving mechanism comprises a first cylinder (1), the first cylinder (1) is installed on the first fixed seat (2), the piston rod of the first cylinder (1) is connected to the first connecting rod (3), one end of the first connecting rod (3) is installed with a first joint bearing, the center of the first joint bearing passes through a first guide rod, and the first guide rod is fixed on the first fixed plate (7); The first fixed plate (7) is provided with a compressed air inlet (8); the compressed air inlet (8) is connected to an air source; A second fixed plate (10) is installed in the second vertical plate (11), and the second driving mechanism includes a second cylinder (15), a piston rod of the second cylinder (15) is connected to a second connecting rod (12), one end of the second connecting rod (12) is installed with a second joint bearing, and the second joint bearing is connected to the second fixed plate (10) via a rotating shaft; wherein the second fixed plate (10) includes a first flat plate (1001), a connecting ear seat (1002) is arranged at the bottom of the first flat plate (1001), the connecting ear seat (1002) and the first flat plate (1001) are integrally formed, and the first flat plate (1001) is provided with a group of first through holes (1003), and the function of the first through holes (1003) is to be connected to the second vertical plate (11); The second vertical plate (11) comprises a second flat plate (1101), a notch is provided at the center of the second flat plate (1101), and the shape of the notch is the same as that of the first flat plate (1001), the second flat plate (1101) is provided with a group of second through holes (1102), the position of the first through hole (1003) corresponds to the position of the second through hole (1102), and the fixing rod can pass through the first through hole (1003) and the second through hole (1102) in sequence to fix the second fixing plate (10) in the second vertical plate (11); The end of the second cylinder (15) is fixedly mounted on a connecting plate, a slider is mounted on the bottom of the connecting plate, the slider and the guide rail (13) are interlocked, and the guide rail (13) is mounted on a second fixing seat (14); The third driving mechanism comprises a third cylinder (18), a piston rod of the third cylinder (18) is connected to a third connecting rod (16), and the third connecting rod (16) passes through the third vertical plate (17) and is connected to the second vertical plate (11).

2. The metal bellows fatigue testing machine according to claim 1, characterized in that: The first fixing plate (7) is mounted with a temperature sensor (4).

3. The metal bellows fatigue testing machine according to claim 1, characterized in that: The distance between the first vertical plate (6) and the second vertical plate (11) is adjustable, and the bellows (19) is flange-connected to the first fixed plate (7) and the second fixed plate (10) respectively.

4. The metal bellows fatigue testing machine according to claim 1, characterized in that: The first vertical plate (6) and the third vertical plate (17) are both installed on a workbench (21).

5. A method for operating a metal bellows fatigue testing machine as claimed in claim 1, characterized in that The following steps are involved: Step S1: installing the bellows (19) between the first vertical plate (6) and the second vertical plate (11); Step S2: simultaneously starting the first drive mechanism, the second drive mechanism, the third drive mechanism and the heating unit, wherein the first drive mechanism drives the bellows (19) to twist, the second drive mechanism drives the bellows (19) to move radially, and the third drive mechanism drives the bellows (19) to move axially; Step S3: When the number of detections reaches a set value, the first drive mechanism, the second drive mechanism, the third drive mechanism and the heating element (5) are stopped, and detection records of the model and batch of the bellows (19) are kept.

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