High temperature static bending fatigue test device for metal bellows

Abstract

The application provides a metal bellows high-temperature static bending fatigue test device, and relates to the field of metal bellows performance testing. The test device comprises: a rack and a turnover frame, the turnover frame is rotationally connected to the rack, and the turnover frame is used to drive the free end of the metal bellows to reciprocate. A lifting seat is vertically slidably arranged on the rack, and the lifting seat is configured to be driven to move vertically by a lifting driving mechanism. A heater is fixed to the lifting seat, and the heater is configured to move vertically into and out of the inner cavity of the metal bellows with the lifting seat.

Description

Technical Field

[0001] This invention relates to the field of performance testing of metal bellows, and specifically to a high-temperature static bending fatigue testing device for metal bellows. Background Technology

[0002] High-temperature resistant metal hoses are widely used in aerospace, nuclear power, petrochemical and other high-temperature environments for flexible connections and vibration compensation. Their high-temperature static bending performance is a key indicator of product reliability. When conducting high-temperature static bending tests according to relevant national standards, the inner cavity of the metal bellows needs to be heated to a high temperature before its free end is repeatedly bent to test its fatigue performance at high temperatures.

[0003] In existing experiments, a technician holds a heater and inserts it into the corrugated metal pipe through the opening at the top, heating the inside of the pipe to a high temperature. Once the temperature is reached, the heater is quickly removed manually, and the pipe is then repeatedly bent. After bending, the damage to the inner wall of the pipe, the integrity of the outer insulation layer, and its airtightness are checked. However, manually holding the heater makes it difficult to maintain a proper gap between the heater and the inner wall of the pipe. The surface temperature of the heater is usually much higher than the target heating temperature. If the heater directly contacts the inner wall of the pipe, heat is directly transferred to the pipe wall at the contact point through thermal conduction, while areas far from the contact point rely on air convection and thermal radiation for heating. The pipe wall temperature at the contact point will be significantly higher than that of the non-contact areas, forming localized high-temperature points, leading to inaccurate experimental results. Summary of the Invention

[0004] The purpose of this invention is at least to provide a high-temperature static bending fatigue testing device for metal bellows, in order to solve the problems of uncontrollable heating process and poor repeatability in the existing bending test of metal bellows where a handheld heater is inserted into the tube cavity.

[0005] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0006] One embodiment of the present invention provides a high-temperature static bending fatigue testing device for metal bellows, the testing device comprising: The frame and the tilting frame are rotatably connected to the frame. The tilting frame is used to drive the free end of the metal bellows to bend back and forth.

[0007] The lifting seat is vertically slidably mounted on the frame and is configured to move vertically via a lifting drive mechanism.

[0008] The heater, fixed to the lifting base, is configured to enter and exit the inner cavity of the metal bellows as the lifting base moves vertically.

[0009] In some embodiments, a heater housing is also included, the heater is fixed to the lifting base via the heater housing, the heater housing is fixedly connected to the lower end of the lifting base, and the heater housing is disposed outside the heater.

[0010] In some embodiments, the test apparatus includes a temperature sensor for measuring the temperature inside the metal bellows cavity. The temperature sensor is fixed to the heater housing and spaced apart from the heater inside the heater housing.

[0011] In some embodiments, the lifting drive mechanism includes a lead screw and a lifting motor. The lead screw is rotatably connected to the frame, and the lifting motor drives the lead screw to rotate. The lifting seat cooperates with the lead screw through a screw barrel, and the lifting seat is configured to move vertically driven by the rotation of the lead screw through the screw barrel.

[0012] In some embodiments, the heater housing and the heater are configured to be arranged along the central axis of the metal bellows.

[0013] In some embodiments, the test apparatus includes a mounting base fixed to the bottom wall of the frame, a sealing gasket fixed to the outer ring of the mounting base, and the mounting base is configured to fix and seal the metal bellows fixing end by interference fit between the sealing gasket and the inner ring of the metal bellows fixing end.

[0014] In some embodiments, the fixed end of the flipping frame is connected to the flipping motor, and the flipping frame is driven by the flipping motor to flip around its fixed end. The free end of the flipping frame is configured to hold the free end of the metal bellows.

[0015] In some embodiments, the testing apparatus includes a support plate and rollers. The support plate is fixed to the bottom wall of the frame and arranged on one side of the metal bellows. The rollers are vertically adjustable and are arranged on the support plate. The rollers are configured to support the middle of the metal bellows when the metal bellows is bent.

[0016] In some embodiments, the test apparatus includes a plurality of support plates arranged along the bending direction of the metal corrugated pipe, a plurality of rollers provided on the support plates, the rollers on the support plates being adapted to adjust the bending curve of the metal corrugated pipe, and the rollers being configured to jointly support the middle part of the metal corrugated pipe when the metal corrugated pipe bends.

[0017] In some embodiments, the frame includes a housing, a tilting frame, a support plate and a lifting seat are all disposed in the housing, the side of the housing is provided with an opening, a door panel is hinged to the opening, and a transparent observation window is embedded in the door panel. Attached Figure Description

[0018] The above-described features and advantages of the present invention will be better understood after reading the following detailed description of embodiments of the present disclosure in conjunction with the accompanying drawings. In the drawings, components are not necessarily drawn to scale, and components having similar related properties or features may have the same or similar reference numerals. Wherein: Figure 1 This is a front view of a metal bellows high-temperature static bending fatigue testing apparatus according to some embodiments.

[0019] Figure 2 This is a cross-sectional front view of a metal bellows high-temperature static bending fatigue testing device according to some embodiments.

[0020] Figure 3 This is a cross-sectional back view of a metal bellows high-temperature static bending fatigue testing device according to some embodiments.

[0021] Figure 4 This is a side view of a high-temperature static bending fatigue testing apparatus for metal bellows, as shown in some embodiments.

[0022] Figure 5 This is a structural schematic diagram of the flipping frame and gripper shown in some embodiments.

[0023] Explanation of reference numerals in the attached figures: 10-Box; 11-Opening; 12-Door panel; 13- Transparent viewing window; 20-Support plate; 21-Roller; 22-Guide groove; 30 - Mounting base; 31-Metal bellows; 32 - Insulation layer; 40-Tilting rack; 41- Reversing motor; 50-gripper; 51- hoop plate; 52-Stud; 53-Nut; 54-Base; 60-Adjustable seat; 61-Screw; 62-Lifting motor; 63 - Heater; 64 - Heater housing; 65 - Temperature sensor. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0025] It should be understood that the terms “system,” “device,” “unit,” and / or “module” used herein are one method of distinguishing different components, elements, parts, sections, or assemblies at different levels. However, if other words can achieve the same purpose, they may be replaced by other expressions.

[0026] It is understood that the technical terms that may be used in the description of this specification, such as “center,” “longitudinal,” “lateral,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the implementation method and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the invention.

[0027] It should be noted that the use of terms such as "first" and "second" to define features in this document is merely for the purpose of distinguishing the corresponding features. Unless otherwise stated, these terms have no special meaning and should not be construed as limiting the scope of protection of this invention. As shown in this specification and claims, the terms "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural, unless the context clearly indicates otherwise. Generally, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list; the method or apparatus may also include other steps or elements.

[0028] In the description of this specification, it should also be noted that, unless otherwise expressly specified or limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium, or a connection within two components, etc. Those skilled in the art can understand the specific meaning of the above terms in this specification according to the specific circumstances.

[0029] This specification provides an embodiment of a high-temperature static bending fatigue testing device for metal bellows, referring to... Figures 1-4 The test apparatus includes a frame and a tilting frame 40.

[0030] The frame is the basic support structure of the testing device, used to install and support the various functional components. The frame includes a housing 10. The various functional components, such as the tilting frame 40, the support plate 20 (described later), and the lifting seat 60, are all housed within the housing 10.

[0031] The chamber 10 has a closed structure with an opening 11 on one side. A door panel 12 is hinged to the opening 11 to seal the heating environment, reduce heat loss, and protect operators. A transparent observation window 13 is embedded in the door panel 12, allowing operators to observe the internal testing conditions of the chamber 10. The transparent observation window 13 can be made of quartz glass to withstand high-temperature radiation and avoid the problem of ordinary glass easily breaking under high temperatures.

[0032] The tilting frame 40 is rotatably connected to the frame. The tilting frame 40 is used to drive the free end of the metal bellows 31 to reciprocate through bending. The metal bellows 31 is a flexible metal tube with a continuous corrugated wall, used to provide flexible connection and vibration compensation under high-temperature conditions. The metal bellows 31 has a fixed end and a free end; the fixed end is fixed relative to the frame, and the free end is held by the tilting frame 40. The tilting frame 40 also has a fixed end and a free end; its fixed end is rotatably connected to the side wall of the frame. Under the action of driving force, the tilting frame 40 reciprocates around its fixed end, thereby driving the free end of the metal bellows 31 held at its free end to perform reciprocating bending motion. Bending fatigue testing is an important method to verify the fatigue life of the metal bellows 31 under repeated bending loads. By recording the number of bends and checking the damage to the inner wall of the bellows after bending, the integrity of the insulation layer 32 (which covers the outer wall of the metal bellows 31), and its airtightness, the reliability of the metal bellows 31 is evaluated.

[0033] Reference Figure 1 and Figure 2 The testing apparatus also includes a lifting seat 60. The lifting seat 60 is configured to move vertically via a lifting drive mechanism. The lifting seat 60 is a plate-like or frame-like structure, and is slidably mounted on the inner wall of the frame in the vertical direction under the drive of the lifting drive mechanism. This causes components mounted on it (such as heater 63 and temperature sensor 65) to enter and exit the inner cavity of the metal bellows 31.

[0034] Reference Figure 2 The test apparatus also includes a heater 63. The heater 63 is an electric heating element with a surface temperature higher than the target heating temperature, which heats the inner cavity of the metal bellows 31 through thermal radiation and air convection.

[0035] The heater 63 is fixed relative to the lifting seat 60. Specifically, the heater 63 is fixed to the lower end of the lifting seat 60. The heater 63 enters the inner cavity of the metal bellows 31 vertically as the lifting seat 60 descends, and exits the inner cavity of the metal bellows 31 vertically as the lifting seat 60 rises.

[0036] The heater 63 can be in the form of a rod, cylinder, or ring. In some embodiments, the heater 63 is a ceramic heater, using ceramic material as the substrate, suitable for high-temperature heating scenarios. In other embodiments, the heater 63 is an infrared radiation heater, using infrared lamps or quartz heating tubes, which has rapid heating, high thermal efficiency, and outstanding non-contact heating characteristics.

[0037] In the initial test state, the lifting seat 60 is at its highest position, and the heater 63 is completely above the metal bellows 31. During the test, the metal bellows 31 is mounted on the frame, with the fixed end fixed and the free end held by the tilting frame 40. Then, the lifting drive mechanism is activated, driving the lifting seat 60 to descend, and the heater 63 enters the inner cavity of the metal bellows 31 vertically with the lifting seat 60 for heating. When the inner cavity temperature reaches the test temperature and is maintained for the set time, the lifting drive mechanism drives the lifting seat 60 to rise, and the heater 63 exits the inner cavity of the metal bellows 31. Then, the tilting frame 40 is activated, and the tilting frame 40 reciprocates to rotate the free end of the metal bellows 31 to complete the bending fatigue test.

[0038] This embodiment of the specification uses a lifting seat 60 to fix the heater 63 to the lifting seat 60 and move it vertically with the lifting seat 60 to enter and exit the inner cavity of the metal bellows 31, realizing the automated lifting of the heater and replacing the manual operation method of manually inserting and withdrawing the heater into the cavity in the prior art. The lifting drive mechanism drives the lifting seat 60 to slide vertically along the frame, and the entry depth, dwell time and withdrawal speed of the heater 63 can be precisely controlled. This avoids the problem of poor repeatability caused by the reliance on operating experience for heating time, heater position and withdrawal speed in manual operation, and improves the controllability of the heating process and the repeatability of test data.

[0039] Reference Figure 2 In some embodiments, the test apparatus further includes a heater housing 64. The heater housing 64 is a support structure fixedly connected to the lower end of the lifting seat 60 and located outside the heater 63. The radial dimension of the outer edge of the heater housing 64 is larger than the maximum outer diameter of the heater 63. The heater housing 64 is wrapped around the outside of the heater 63. The arrangement of the heater housing 64 avoids the heater 63 from directly contacting the metal bellows wall, thereby avoiding the formation of local high temperature points and improving the accuracy of the test results.

[0040] The heater housing 64 can be a closed plate structure, a cage structure, or a frame structure. A closed plate structure heater housing 64 uses a material with good thermal conductivity, ensuring it does not affect the heating of the metal bellows inner cavity by the heater 63. A cage structure heater housing 64 has a cage-like mesh shape, covering the outside of the heater 63, balancing physical protection and breathability, without affecting heat radiation and convection. A frame structure heater housing 64 is a rigid frame, simple to manufacture, and has high structural strength.

[0041] In some embodiments, the heater housing 64, heater 63, and the central axis of the metal bellows 31 are arranged. That is, the central axis of heater 63 and heater housing 64 coincides with the central axis of metal bellows 31. When the lifting seat 60 drives heater housing 64 and heater 63 into the inner cavity of metal bellows 31, heater 63 and heater housing 64 are always kept at the center position of the inner cavity of metal bellows 31. The gap between heater 63 and the pipe wall is uniform in the circumferential direction, so that all areas of the pipe wall of metal bellows 31 are heated evenly, avoiding the problem of excessively high temperature on one side of the pipe wall and excessively low temperature on the other side due to heater eccentricity.

[0042] Reference Figure 2 In some embodiments, the test apparatus includes a temperature sensor 65. The temperature sensor 65 is used to measure the temperature inside the metal bellows 31. The temperature sensor 65 is fixed to the heater housing 64, and the temperature sensor 65 is spaced apart from the heater 63 inside the heater housing 64. The temperature measuring end of the temperature sensor 65 is located outside the heater housing 64.

[0043] Temperature sensor 65 does not contact heater 63 or the wall of metal bellows 31. When the lifting drive mechanism drives heater housing 64 to remain inside the cavity of metal bellows 31, heater 63 is located in the middle section of metal bellows 31, and the temperature measuring end of temperature sensor 65 is located at or near the central axis of metal bellows 31, monitoring the air temperature inside the cavity of metal bellows 31 in real time, avoiding temperature measurement deviation caused by direct contact with the high-temperature pipe wall or heater surface.

[0044] In some embodiments, the temperature sensor 65 is a thermocouple that measures temperature using the thermoelectric potential difference between the terminals of two different conductors. The wires connecting the thermocouple pass through the heater housing 64.

[0045] Reference Figure 1 , Figure 2 and Figure 4 In some embodiments, the lifting drive mechanism includes a lead screw 61 and a lifting motor 62. The lead screw 61 is rotatably connected to the frame. Specifically, the lead screw 61 is arranged vertically, and its two ends are rotatably connected to the inner wall of the frame. The lifting motor 62 is fixedly installed inside the housing 10, and its output shaft is drivenly connected to the lead screw 61, driving the lead screw 61 to rotate.

[0046] The lifting seat 60 is connected to the lead screw 61 via a screw barrel, and the internal thread of the screw barrel is connected to the external thread of the lead screw 61. When the lifting motor 62 drives the lead screw 61 to rotate forward or reverse, the screw barrel drives the lifting seat 60 to move up and down along the lead screw 61.

[0047] In some embodiments, the lifting drive mechanism can be replaced by a combination of a cylinder and a guide rod. The lifting seat 60 is fixed to the end of the cylinder piston rod, and the cylinder lifting is controlled by a solenoid valve, resulting in faster response and lower cost, but slightly lower position control accuracy, requiring the addition of limit switches. In other embodiments, the lifting drive mechanism is a rack and pinion drive, where the lifting motor 62 drives the gear to rotate, and the gear meshes with a rack fixed to the inner wall of the frame. The lifting seat 60 is fixed to the rack, providing better load-bearing capacity than a screw drive. In still other embodiments, the lifting drive mechanism is a hydraulic cylinder drive, with the end of the hydraulic cylinder piston rod connected to the lifting seat 60, providing high thrust and smooth operation.

[0048] Reference Figure 3 The metal bellows 31 is vertically arranged inside the housing 10. In some embodiments, the test apparatus includes a mounting base 30. The mounting base 30 is fixed to the bottom wall of the frame and has a cylindrical or columnar structure. A sealing gasket is fixed to the outer ring of the mounting base 30. The sealing gasket is made of an elastic, high-temperature resistant material, such as silicone rubber or graphite, and is fixedly wrapped around the outer ring of the mounting base 30. The fixed end of the metal bellows 31 is press-fitted to the mounting base 30 through the sealing gasket. When the fixed end of the metal bellows 31 is fitted into the mounting base 30, the sealing gasket is compressed and undergoes elastic deformation, fixing and sealing the fixed end of the metal bellows 31, so that the heat inside the cavity of the metal bellows 31 will not be lost from its bottom end during the heating process.

[0049] Reference Figure 5 In some embodiments, the fixed end of the flipping frame 40 is connected to the flipping motor 41 via a rotating shaft. The rotating shaft of the fixed end is arranged horizontally. The flipping frame 40 is driven by the flipping motor 41 to flip around its fixed end. The flipping motor 41 is fixed to the outer wall of the frame, and its output shaft passes through the side wall of the frame and is connected to the fixed end of the flipping frame 40. The free end of the flipping frame 40 is configured to hold the free end of the metal bellows 31. The flipping motor 41 drives the flipping frame 40 to reciprocate around its fixed end. The flipping angle can be 30° to 180°, the flipping frequency can be 5 to 30 times / min, and the number of bends can be 10 to 10,000 times to adapt to the test requirements of different standards and working conditions. In some embodiments, the flipping motor 41 can be a stepper motor, which provides precise angle control and low cost.

[0050] In some embodiments, the free end of the tilting frame 40 is provided with a gripper 50. The gripper 50 includes a base 54, a hoop 51, a stud 52, and a nut 53. The base 54 is fixedly connected to the free end of the tilting frame 40. The hoop 51 is hinged to the base 54 and can rotate and open about the hinge point. The stud 52 is hinged to the base 54, and the free end of the hoop 51 is provided with a slot into which the stud 52 can be inserted. The end of the stud 52 inserted into the slot is fixed by the nut 53. When clamping the free end of the metal bellows 31, the hoop 51 is opened, the free end of the metal bellows 31 is inserted, the hoop 51 is closed, the stud 52 is inserted into the slot of the hoop 51, and the nut 53 is tightened to fix it. Disassembly is performed by reversing the operation.

[0051] In some embodiments, the gripper 50 can be replaced by a pneumatic gripper, which is driven by a cylinder to open and close, providing fast response and uniform clamping force. In other embodiments, the gripper 50 can be replaced by an electromagnetic attraction clamping structure, which uses an electromagnet to attract the clamping plate 51, making operation convenient.

[0052] Reference Figure 2 and Figure 5 In some embodiments, the testing apparatus includes a support plate 20 and rollers 21. The support plate 20 is fixed to the bottom wall of the frame and is arranged on one side of the metal bellows 31. The support plate 20 is a vertically arranged plate structure.

[0053] Rollers 21 are vertically adjustable and mounted on the support plate 20. Rollers 21 are configured to support the middle of the corrugated metal pipe 31 when it bends. Specifically, the support plate 20 has guide grooves 22 through which rollers 21 achieve vertical adjustment—the mounting base of rollers 21 can move up and down within the guide grooves 22 and lock at the desired height to accommodate corrugated metal pipes 31 with different diameters and bending radii. The outer edge of rollers 21 is an arc surface, making point or line contact with the outer surface of the corrugated metal pipe 31, thus providing support without affecting the bending deformation of the corrugated metal pipe 31.

[0054] This embodiment of the specification uses a support plate 20 and rollers 21 to support the middle of the metal bellows 31 when it is bent, controlling the bending point of the metal bellows 31 to be in a predetermined position, thus avoiding the problem of test result deviation caused by random displacement of the bending point during the bending process. The rollers 21 can be adjusted vertically to adapt to metal bellows 31 of different diameters, and are easy to adjust and highly adaptable.

[0055] In some embodiments, the testing apparatus includes a plurality of support plates 20. The support plates 20 are arranged along the bending direction of the corrugated metal pipe 31, and each support plate 20 is provided with a plurality of rollers 21. The rollers 21 are configured to collectively support the middle portion of the corrugated metal pipe 31 when it bends. The rollers 21 on the support plates 20 are adapted to adjust the bending curve of the corrugated metal pipe 31; that is, the height of each roller 21 on each support plate 20 is adjusted accordingly based on the expected bending curve shape of the corrugated metal pipe 31 in the bending state, so that the support height of each roller 21 matches the bending curve.

[0056] The embodiments in this specification arrange multiple support plates 20 along the bending direction, and adjust the height of the rollers 21 on each support plate 20 to adapt to the bending curve of the metal bellows 31. This ensures that the metal bellows 31 is continuously supported by multiple points during the bending process, and the bending point position is precisely controllable. This avoids local collapse of the pipe body or drift of the bending point during the bending process, and further improves the consistency and reliability of the test results.

[0057] The basic concepts have been described above. It is clear that the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification, especially for those skilled in the art. Furthermore, unless expressly stated in the claims, the order of elements and sequences, the use of numbers and letters, or other names in this specification are not intended to limit the order of the processes and methods described herein. Although various examples of currently considered useful embodiments of the invention have been discussed in the foregoing disclosure, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments. Rather, the claims are intended to cover all modifications and equivalent combinations that conform to the substance and scope of the embodiments described herein.

Claims

1. A high-temperature static bending fatigue testing device for metal bellows, characterized in that, The test apparatus includes: The frame and the tilting frame are rotatably connected to the frame and are used to drive the free end of the metal bellows to bend back and forth. A lifting seat, which is vertically slidably disposed on the frame, is configured to move vertically via a lifting drive mechanism; A heater, fixed to the lifting seat, is configured to move vertically with the lifting seat into and out of the inner cavity of the metal bellows.

2. The high-temperature static bending fatigue testing device for metal bellows according to claim 1, characterized in that, It also includes a heater housing, the heater is fixed to the lifting base through the heater housing, the heater housing is fixedly connected to the lower end of the lifting base, and the heater housing is wrapped around the outside of the heater.

3. The high-temperature static bending fatigue testing device for metal bellows according to claim 2, characterized in that, The test apparatus includes a temperature sensor for measuring the temperature inside the metal bellows. The temperature sensor is fixed to the heater housing and spaced apart from the heater inside the heater housing.

4. The high-temperature static bending fatigue testing apparatus for metal bellows according to any one of claims 1 to 3, characterized in that, The lifting drive mechanism includes a lead screw and a lifting motor. The lead screw is rotatably connected to the frame, and the lifting motor drives the lead screw to rotate. The lifting seat cooperates with the lead screw through a screw cylinder, and the lifting seat is configured such that the rotation of the lead screw drives vertical movement through the screw cylinder.

5. The high-temperature static bending fatigue testing device for metal bellows according to claim 2, characterized in that, The heater housing and the heater are configured to be arranged along the central axis of the metal bellows.

6. The high-temperature static bending fatigue testing device for metal bellows according to claim 1, characterized in that, The test apparatus includes a mounting base fixed to the bottom wall of the frame. A sealing gasket is fixed to the outer ring of the mounting base. The mounting base is configured to fix and seal the metal bellows fixing end by interference fit between the sealing gasket and the inner ring of the metal bellows fixing end.

7. The high-temperature static bending fatigue testing device for metal bellows according to claim 1, characterized in that, The fixed end of the flipping frame is connected to the flipping motor for transmission. The flipping frame is driven by the flipping motor to flip around its fixed end. The free end of the flipping frame is configured to clamp the metal bellows.

8. The high-temperature static bending fatigue testing device for metal bellows according to claim 1, characterized in that, The testing device includes a support plate and rollers. The support plate is fixed to the bottom wall of the frame and is arranged on one side of the metal corrugated pipe. The rollers are vertically adjustable and are mounted on the support plate. The rollers are configured to support the middle of the metal corrugated pipe when it bends.

9. The high-temperature static bending fatigue testing device for metal bellows according to claim 8, characterized in that, The test apparatus includes several support plates arranged along the bending direction of the metal corrugated pipe. Several rollers are provided on the support plates, and the rollers on the support plates are adapted to adjust the bending curve of the metal corrugated pipe. The rollers are configured to jointly support the middle part of the metal corrugated pipe when it bends.

10. The high-temperature static bending fatigue testing device for metal bellows according to claim 8, characterized in that, The frame includes a housing, and the tilting frame, the support plate and the lifting seat are all disposed in the housing. The side of the housing is provided with an opening, and a door panel is hinged to the opening. A transparent observation window is embedded in the door panel.

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