A bellows angle offset test device

Abstract

The present invention relates to the technical field of bellows testing equipment, and specifically discloses a bellows angle offset testing equipment, which includes a body, a support seat and a driving device; the support seat is provided with two sets of swing assemblies, the swing assemblies include a swing frame rotatably connected to the support seat and a first flange seat fixed to the swing frame in an adjustable manner, the two swing frames are connected via a synchronous mechanism and are jointly driven by the driving device; two second flange seats with adjustable positions are installed on the body, the two second flange seats are distributed on both sides of the two first flange seats and the central axes of the four are coplanar. This bellows angle offset testing equipment can simulate the actual working conditions of the bellows and improve the accuracy of the test data; based on the adjustable design, it has a wide range of applicability; it can test two bellows at the same time with high efficiency, can reduce the volatility of the load on the driving device and can recover the elastic potential energy of the bellows, has high operating stability, low energy consumption, and significantly saves testing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of bellows testing equipment, and in particular to a bellows angle deviation testing equipment. Background Art

[0002] As a core component of high-precision flexible connections, welded bellows play an irreplaceable and critical role in vacuum sealing systems, dynamic compensation devices, semiconductor manufacturing equipment, aerospace vehicles, precision instruments and other fields. Their fatigue life parameters directly determine the operational reliability and safety margin of the equipment, so performance verification must be carried out through standardized testing. The axial linear telescopic loading test method currently commonly used in the industry does not take into account the angular offset characteristics of the bellows when performing multi-degree-of-freedom compound motion with the swinging parts under actual working conditions. This leads to significant differences between the experimental load spectrum and the actual stress state, making it difficult to accurately characterize the mechanical response characteristics and failure mechanism under angular offset conditions.

[0003] The patent with publication number CN117606763A provides a bellows swing test device that can improve test data by simulating the stress state under swing conditions. However, the structure of the device is relatively complex, the offset angle and bending radius are poorly adjustable, and the ability to reproduce working conditions is insufficient. During the test, the power system load fluctuated violently and the operating stability was insufficient. In addition, since an energy feedback mechanism has not been established, the elastic potential energy of the bellows cannot be recycled, resulting in low system energy efficiency and high operating energy consumption, which significantly increases the testing cost. Summary of the Invention

[0004] To address the shortcomings of the existing technology, the present invention provides a bellows angle deviation test device. This device accurately replicates the stress conditions experienced during actual operation, laying the foundation for fatigue life assessment and improving the reliability of test data. Its adjustable design allows it to meet the testing requirements of bellows of varying lengths and operating conditions, demonstrating excellent adaptability. Furthermore, the device combines the technical advantages of low operating energy consumption with high testing efficiency.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] A bellows angle deviation testing device includes a body, a support base and a driving device fixed on the body; the support base is provided with two sets of structurally symmetrical swing assemblies, the swing assemblies including a swing frame and a first flange seat, the lower end of the swing frame is rotatably connected to the support base; the first flange seat is fixed to the swing frame in a position-adjustable manner; the two swing frames are connected via a synchronization mechanism and are driven by the driving device together, and can swing back and forth synchronously and in the same direction within a preset angle range; two second flange seats with adjustable positions are installed on the body, the two second flange seats are distributed on both sides of the two first flange seats and the central axes of the four are coplanar; when two bellows are tested simultaneously, the first flange seat and the second flange seat on the same side are respectively fixedly connected to the two ends of a bellows, when the two swing frames are in the middle position of the stroke, the two first flange seats and the two second flange seats are symmetrically distributed and the central axes of the two first flange seats coincide, so that the shapes of the two bellows are symmetrical, when the swing frame swings to one side to the end point of the stroke, the central axes of the first flange seat and the second flange seat on that side coincide, and the corresponding bellows are in a contracted state.

[0007] In a preferred embodiment, the synchronization mechanism includes two synchronization gears and a driving gear, the two synchronization gears are respectively coaxially fixedly connected to the two swing frames, the driving gear is engaged with the two synchronization gears, and the driving gear is transmission-connected to the driving device.

[0008] In a preferred embodiment, the synchronization mechanism includes a first connecting rod, both ends of which are rotatably connected to the upper ends of the two swing frames respectively, and the two swing frames, the support seat and the first connecting rod together constitute a parallel four-bar mechanism.

[0009] In a preferred embodiment, first guide members parallel to each other are fixed to the two swing frames, two first flange seats are slidably engaged with the two first guide members, and the two first flange seats are rotatably connected to the two ends of a second connecting rod; the second connecting rod and the support seat are rotatably connected to a telescopic mechanism, and the telescopic mechanism, the second connecting rod, the support seat and any swing frame form a parallel four-bar mechanism, and the telescopic mechanism can be telescoped along the extension direction of the first guide member;

[0010] Furthermore, each swing frame includes two swing arms spaced apart from each other, the first guide member is a guide groove provided on opposite side walls of the two swing arms, and two sliders are fixed on the first flange seat, and the two sliders are respectively slidably engaged with the two guide grooves;

[0011] Furthermore, the telescopic mechanism is an automatic telescopic device.

[0012] In a preferred embodiment, the support base is supported by a lifting device installed in the machine body, and the machine body is rotatably connected to two oblique arms symmetrically distributed on both sides of the support base, and the two oblique arms are respectively fixed with second guide members extending linearly, and the two second flange seats are respectively slidably engaged with the two second guide members, and the second flange seats are provided with locking bolts for locking their positions; an angle adjustment mechanism for adjusting the inclination angle of the two oblique arms is installed on the machine body;

[0013] Furthermore, the lifting device is provided with at least two lifting columns extending vertically upward, and the support seat is fixedly supported by the lifting columns.

[0014] Furthermore, the lower end of the oblique arm extends into the body, and the angle adjustment mechanism includes a driving mechanism and two pull rods. The lower ends of the two oblique arms are respectively connected to the driving mechanism via a pull rod.

[0015] In a preferred embodiment, the first flange seat and the second flange seat are capable of being sealed with the flange joint at the end of the bellows; at least one of the first flange seat and the second flange seat is connected to an exhaust hose that connects the inner cavity of the bellows with the vacuum generating system;

[0016] Furthermore, the vacuum generating system is installed inside the machine body; the vacuum hose is connected between the second flange seat and the vacuum generating system.

[0017] Compared with the prior art, the bellows angle deviation test device of the present invention has the following beneficial technical effects:

[0018] 1. The offset angle and bending radius can be adjusted and preset, which can simulate the actual working conditions of the corrugated pipe and improve the objectivity and accuracy of the test data. Based on the adjustability of the offset angle and bending radius, and the ability of the first and second flange seats to adapt to the length of the corrugated pipe, this equipment has a wide range of applicability.

[0019] 2. It can test two bellows of the same specifications at the same time, which significantly improves the efficiency.

[0020] 3. Since the two swing frames adopt a linkage design, during the test, when the offset angle of one bellows gradually increases to the set value, the other bellows undergoes reverse deformation, that is, gradually returns to the contracted state. This alternation, on the one hand, reduces the volatility of the load on the drive device, improves operational stability and energy efficiency. On the other hand, during the contraction process of the bellows, the reverse load generated by the rebound force is used to drive the other bellows to deflect the angle, thereby reducing the load on the drive device, significantly reducing operational energy consumption, and saving testing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0022] Figure 1 It is a schematic structural diagram of a corrugated pipe angle offset test device.

[0023] Figure 2 It is a schematic structural diagram of the corrugated pipe angle offset test device in another direction.

[0024] Figure 3 It is a schematic structural diagram of the support base and the two swing frames.

[0025] Figure 4 It is a schematic diagram of the distribution relationship of the support base, the two swing frames, the first connecting rod and the second connecting rod.

[0026] Figure 5 It is a schematic diagram of the matching structure of the corrugated pipe angle offset test device and two corrugated pipes.

[0027] Figure 6 It is a schematic diagram of the state of the corrugated pipe angle offset test device when the swing frame swings to the middle position of the stroke.

[0028] Figure 7 It is a schematic diagram of the state of the corrugated pipe angle offset test device when the swing frame swings to one end of the stroke.

[0029] Figure 8 It is a schematic diagram of the state of the corrugated pipe angle offset test device when the swing frame swings to the other end of the stroke.

[0030] Figure 9 It is a schematic diagram of the principle of adjustable working parameters of the corrugated pipe angle offset test device.

[0031] Figure 10 It is a schematic structural diagram inside the machine body.

[0032] Figure 11 It is a schematic structural diagram of the corrugated pipe angle offset test device when the air extraction hose is set.

[0033] In the figure: 1. Machine body, 2. Second flange seat, 3. Support base, 4. Driving device, 5. First flange seat, 6. Swing frame, 61. Swing arm, 7. First connecting rod, 8. First rotating shaft, 9. Synchronous gear, 10. Driving gear, 11. Slide block, 12. First guiding member, 13. Second connecting rod, 14. Telescopic mechanism, 15. Second rotating shaft, 16. Flange joint, 17. Inclined arm, 18. Second guiding member, 19. Lifting column, 20. Pull rod, 21. Locking bolt, 22. Third rotating shaft, 23. Lifting device, 24. Driving mechanism, 25. Air extraction hose. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0035] Refer to Figures 1-5 As shown, the embodiment discloses a specific design solution of a bellows angle offset test device, including a machine body 1, on which a support seat 3 and a driving device 4 are fixed; two sets of symmetrically structured swing assemblies are provided on the support seat 3; each swing assembly includes a swing frame 6 and a first flange seat 5. The lower end of the swing frame 6 is rotatably connected to the support seat 3 through a first rotating shaft 8. The first flange seat 5 is used for fixedly connecting with a flange joint 16 at one end of the bellows. The position of the first flange seat 5 is higher than that of the first rotating shaft 8, and the first flange seat 5 is fixedly connected to the swing frame 6 in an adjustable position manner, so that the distance between the first flange seat 5 and the first rotating shaft 8 is adjustable; the two swing frames 6 in the two swing assemblies are connected through a synchronization mechanism, and the two swing frames 6 are jointly driven by the driving device 4 and can swing reciprocally synchronously and in the same direction within a preset angle range; two second flange seats 2 with adjustable positions are installed on the machine body 1, and the second flange seats 2 are used for fixedly connecting with the flange joints 16 at the other end of the bellows. The two second flange seats 2 are distributed on both sides of the whole of the two first flange seats 5 and the central axes of the four are coplanar;

[0036] Refer to Figures 5-8 As shown, when testing two bellows simultaneously, the two first flange seats 5 are respectively fixedly connected to the flange joints 16 at one end of the two bellows, and the flange joints 16 at the other end of the two bellows are respectively fixedly connected to the corresponding second flange seats 2, thereby installing and fixing two bellows with the same specifications on this test device; during the test, the driving device 4 drives the two swing assemblies to swing reciprocally within a preset angle. When the two swing frames 6 swing to the middle position of the stroke, the four of the two first flange seats 5 and the two second flange seats 2 are symmetrically distributed and the central axes of the two first flange seats 5 coincide. At this time, the shapes of the two bellows are in a symmetric state. When the swing frame 6 swings to one side to the end point of the stroke, the central axes of the first flange seat 5 and the second flange seat 2 on this side coincide, and the corresponding bellows is in a contracted state. Based on the structural characteristics of the present invention, by routinely debugging the positional relationships of the swing frame 6, the first flange seat 5 and the second flange seat 2, the above test process can be realized, and there are no technical obstacles during the implementation process.

[0037] Refer to Figures 6-9As shown, the usage method and working principle of this corrugated pipe angle offset testing device are as follows:

[0038] First, set the offset angle and bending radius.

[0039] Based on the structural characteristics of this corrugated pipe angle offset testing device, it can be determined that during the testing process, the two swing frames 6 have the same swing angle α, which is the offset angle at both ends of the corrugated pipe during the testing process. Therefore, by using the driving device 4 to control the swing angle α of the swing frame 6, the offset angle can be preset; there is a corresponding relationship between the distance L1 between the first flange seat 5 and the first rotating shaft 8 and the bending radius of the corrugated pipe during the testing process. Therefore, by adjusting the position of the first flange seat 5 on the swing frame 6 to change the size of the distance L1 between the first flange seat 5 and the first rotating shaft 8, the bending radius can be preset.

[0040] Then, install the corrugated pipe to be tested.

[0041] Swing the swing frame 6 to one side until it reaches the stroke end point, adjust the position of the second flange seat 2 on this side so that the central axes of the second flange seat 2 and the first flange seat 5 coincide, and adjust the distance L2 between the second flange seat 2 and the first flange seat 5 according to the length of the corrugated pipe in the contracted state. Fix the two flange joints 16 of a corrugated pipe to the first flange seat 5 and the second flange seat 2 respectively, thus completing the installation and fixation of one corrugated pipe; swing the swing frame 6 to the other side until it reaches the stroke end point, and complete the installation and fixation of the second corrugated pipe in the same way; in the actual operation process, the above installation steps can be flexibly adjusted according to the actual situation.

[0042] Finally, conduct the test.

[0043] Use the driving device 4 to drive the two swing frames 6 to reciprocate within the preset angle, and be respectively pulled by the two first flange seats 5. The two corrugated pipes will cyclically perform angle offset and contraction reset, and complete the subsequent test work according to the test requirements.

[0044] The technical advantages of the corrugated pipe angle offset testing device in the present invention are as follows:

[0045] Since the offset angle and bending radius can be adjusted and preset, the actual working conditions of the corrugated pipe when exerting the angle offset effect can be simulated, improving the objectivity and accuracy of the test data. Based on the adjustability of the offset angle and bending radius, and the fact that the first flange seat 5 and the second flange seat 2 can be adaptively adjusted according to the length of the corrugated pipe, this corrugated pipe angle offset testing device can be applied to the testing work of corrugated pipes with different lengths and application scenarios, and has good applicability.

[0046] The bellows angle deviation test equipment can test two bellows of the same specifications at the same time, significantly improving efficiency.

[0047] More importantly, if Figure 7 、 Figure 8 As shown, since the two swing frames 6 adopt a linkage design, during the test, while the offset angle of one bellows gradually increases to the set value, the other bellows undergoes reverse deformation, that is, the offset angle gradually decreases, and finally resets to the contracted state. This alternation brings about very significant actual effects. On the one hand, the overall load fluctuation of the driving device 4 is small, the operation is stable, and the energy efficiency ratio is high. On the other hand, during the process of the bellows being reset to the contracted state, the reverse load generated by the rebound force of the bellows can be used to drive the other bellows to perform angular displacement, thereby recovering the elastic potential energy of the bellows, reducing the load of the driving device 4, significantly reducing operating energy consumption, and saving testing costs. Especially in large-scale and multiple-time testing work, the above technical effects are particularly prominent.

[0048] The synchronization mechanism is arranged between the two swing frames 6 and is a key component for realizing the synchronization and reciprocating swing of the two swing frames 6 in the same direction. Figures 2-4 As shown, the present invention provides three implementation methods for the synchronization mechanism:

[0049] First, the synchronization mechanism includes two synchronization gears 9 and a driving gear 10. The two synchronization gears 9 are respectively coaxially fixedly connected to the two swing frames 6, that is, the synchronization gears 9 and the swing frames 6 can rotate together around the first rotating shaft 8. The driving gear 10 is engaged with the two synchronization gears 9, and the driving gear 10 is connected to the driving device 4 in a transmission manner. Therefore, when the driving gear 10 rotates, the two synchronization gears 9 rotate synchronously to drive the two swing frames 6 to swing synchronously and in the same direction. The driving device 4 is preferably a motor device.

[0050] Secondly, the synchronization mechanism includes a first connecting rod 7, the two ends of which are rotatably connected to the upper ends of the two swing frames 6 respectively. The two swing frames 6, the support base 3 and the first connecting rod 7 together constitute a parallel four-bar mechanism. Based on the transmission characteristics of the parallel four-bar mechanism, the two swing frames 6 must maintain synchronization and the same direction when swinging;

[0051] The third is to combine the above two structures, that is, fixed synchronous gears 9 are respectively installed at the lower ends of the two swing frames 6, and the two synchronous gears 9 are engaged with the driving gear 10. At the same time, the upper ends of the swing frames 6 are connected through the first connecting rod 7, thereby making the matching structure of the two swing frames 6 more stable and improving the strength.

[0052] The first flange seat 5 is fixed to the swing frame 6 in a position-adjustable manner, ensuring that the distance between the first flange seat 5 and the first rotating shaft 8 is adjustable, thereby meeting the test requirements of different bending radii;

[0053] Specifically, linear guiding members such as guide rails and guide grooves can be installed on the swing frame 6. The first flange seat 5 is slidably engaged with the linear guiding member, so that the position of the first flange seat 5 can be adjusted. A locking member is provided on the first flange seat 5 to lock the position of the first flange seat 5.

[0054] Preferably, as Figure 3 , Figure 4 shown, first guiding members 12 extending linearly are respectively fixed on the two swing frames 6. The two first guiding members 12 are parallel, and are guide rails or guide grooves. Since the two swing frames 6 swing in the same direction and synchronously, the two first guiding members 12 can always remain parallel. The two first flange seats 5 are respectively slidably engaged with the two first guiding members 12. The two first flange seats 5 are respectively rotatably connected to both ends of a second connecting rod 13 through a second rotating shaft 15. The axes of the two first rotating shafts 8 and the two second rotating shafts 15 are parallel and are distributed along the vertices of a parallelogram. Thus, the two swing frames 6, the second connecting rod 13 and the support seat 3 form a parallelogram linkage. The second connecting rod 13 and the support seat 3 are respectively rotatably connected to a telescopic mechanism 14. The telescopic mechanism 14, the second connecting rod 13 and the support seat 3 form a parallelogram linkage with any one of the swing frames 6, and the telescopic mechanism 14 can telescopically move along the extending direction of the first guiding member 12.

[0055] Thus, the telescopic movement of the telescopic mechanism 14 can drive the first flange seat 5 to slide on the first guiding member 12 to adjust the distance between the first flange seat 5 and the first rotating shaft 8, that is, the bending radius. Based on the above structural design of the multi-linkage, it can be ensured that the distances between the two first flange seats 5 and the corresponding first rotating shafts 8 are equal, and at the same time, it is also ensured that the installation method of the telescopic mechanism 14 will not interfere with the swinging of the swing frame 6.

[0056] Furthermore, each swing frame 6 includes two swing arms 61 spaced apart along the length direction of the first rotating shaft 8. The first guiding member 12 is a guide groove formed on the opposite side walls of the two swing arms 61. Two sliders 11 are fixed on the first flange seat 5, and the two sliders 11 are respectively slidably engaged with the two guide grooves. Thus, the cooperation structure between the swing frame 6 and the first flange seat 5 is more stable.

[0057] Furthermore, the telescopic mechanism 14 is an automatic telescopic device such as an electric push rod or a cylinder. Combining with the existing mature automation control technology, the automatic and precise adjustment of the bending radius can be realized.

[0058] The second flange seat 2 is mounted on the body 1 to provide support for one end of the bellows. To ensure that the bellows angle deviation test equipment can be applied to bellows of different lengths, the second flange seat 2 is mounted on the body 1 in a position-adjustable manner. In a specific implementation, a support arm can be provided on the body 1 to provide support for the second flange seat 2. The second flange seat 2 can be fixed to different positions on the support arm by bolts, thereby achieving adjustability of the position of the second flange seat 2. A more preferred embodiment is:

[0059] See Figure 9 、 Figure 10 As shown, the support seat 3 is supported by a lifting device 23 installed on the body 1, and the body 1 is rotatably connected to two oblique arms 17 via two third rotating shafts 22. The two oblique arms 17 are symmetrically distributed on both sides of the support seat 3, and the third rotating shaft 22 is parallel to the axis of the second rotating shaft 15. The two oblique arms 17 are respectively fixed with second guide members 18 that extend in a straight line and are perpendicular to the extension direction of the third rotating shaft 22. The second guide members 18 are guide rails or guide grooves. The two second flange seats 2 are respectively slidably matched with the two second guide members 18. The second flange seats 2 are provided with locking bolts 21 for locking their positions; an angle adjustment mechanism that can drive the two oblique arms 17 to rotate to adjust the tilt angle is installed on the body 1;

[0060] Thus, after the offset angle and the bending radius are preset, the inclination angle of the inclined arm 17 can be adjusted by the angle adjustment mechanism, thereby adjusting the direction of the second flange seat 2, ensuring that when the swing frame 6 swings to one side to the end point of the stroke, the central axes of the second flange seat 2 and the first flange seat 5 on that side are coplanar and parallel. Thereafter, the upper and lower positions of the support seat 3 are adjusted by the lifting device 23, and the position of the second flange seat 2 on the second guide member 18 is adjusted to ensure that the central axes of the second flange seat 2 and the first flange seat 5 coincide with each other and the spacing just meets the installation requirements of the corrugated pipe in the contracted state; making the adjustment operation of the relative position of the first flange seat 5 and the second flange seat 2 more convenient and accurate;

[0061] Furthermore, the lifting device 23 is an electric or hydraulic lifting device, and the lifting device 23 is provided with at least two lifting columns 19 extending vertically upward, and the support seat 3 is fixedly supported by the lifting columns 19 .

[0062] Furthermore, the lower end of the oblique arm 17 extends into the body 1, and the angle adjustment mechanism includes a driving mechanism 24 and two pull rods 20. The lower ends of the two oblique arms 17 are respectively connected to the driving mechanism 24 via a pull rod 20. Thus, the driving mechanism 24 can drive the oblique arm 17 to rotate via the pull rod 20 to adjust the inclination angle of the two oblique arms 17 at the same time.

[0063] In the application working condition of the angular offset of the bellows, it is often necessary for the bellows to maintain an internal vacuum state. In this case, the forces acting on the bellows during operation are relatively complex. Testing under normal pressure cannot reproduce the actual force state of the bellows, resulting in test results that deviate significantly from the actual situation. To meet the testing requirements in this scenario, the present invention also has the following technical improvements:

[0064] Referring to Figure 11 As shown, the first flange seat 5 and the second flange seat 2 can be hermetically connected to the flange joint at the end of the bellows; among the first flange seat 5 and the second flange seat 2, at least one is connected with an air extraction hose 25 that communicates the inner cavity of the bellows with the vacuum generating system; when testing the bellows, the air inside the bellows can be evacuated by using the air extraction hose 25 to keep the inside of the bellows in a vacuum state, so as to meet the testing requirements of the bellows involving vacuum working conditions. Since the air extraction hose 25 has the characteristic of being bendable and deformable, it will not pose a substantial obstacle to the movement of the first flange seat 5 and the second flange seat 2.

[0065] Furthermore, the vacuum generating system is installed inside the machine body 1; there are two air extraction hoses 25, which are respectively connected between the two second flange seats 2 and the vacuum generating system. During the testing process, the position of the second flange seat 2 remains unchanged. Therefore, it can be avoided that the air extraction hose 25 shakes or moves and affects the vacuum degree inside the bellows.

[0066] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0067] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Claims

1. A bellows angle deviation test device, comprising a body, a support base and a driving device fixed on the body; the support base is provided with two sets of symmetrical swing assemblies, the swing assemblies comprising a swing frame and a first flange seat, the lower end of the swing frame is rotatably connected to the support base; the first flange seat is fixed to the swing frame in a position-adjustable manner; the two swing frames are connected through a synchronization mechanism and driven by the driving device, and can swing back and forth synchronously and in the same direction within a preset angle range; two second flange seats with adjustable positions are installed on the body, the two second flange seats are distributed on both sides of the two first flange seats and the central axes of the four are coplanar; when testing two bellows at the same time, When the two swing frames are in the middle position of the stroke, the two first flange seats and the two second flange seats are symmetrically distributed and the central axes of the two first flange seats coincide. When the swing frame swings to one side to the end point of the stroke, the central axes of the first flange seat and the second flange seat on that side coincide; the two swing frames are respectively fixed with mutually parallel first guide members, the two first flange seats are respectively slidably matched with the two first guide members, and the two first flange seats are respectively rotatably connected to the two ends of a second connecting rod; the second connecting rod and the support seat are respectively rotatably connected to a telescopic mechanism, and the telescopic mechanism, the second connecting rod and the support seat and any swing frame constitute a parallel four-bar mechanism, and the telescopic mechanism can be telescoped along the extension direction of the first guide member.

2. The bellows angle offset testing device according to claim 1, wherein: The synchronization mechanism includes two synchronization gears and a driving gear. The two synchronization gears are respectively coaxially fixedly connected to the two swing frames. The driving gear is engaged with the two synchronization gears, and the driving gear is transmission-connected to the driving device.

3. The bellows angle offset test device according to claim 1 or 2, characterized in that: The synchronization mechanism includes a first connecting rod, both ends of which are rotatably connected to the upper ends of the two swing frames respectively, and the two swing frames, the support seat and the first connecting rod together form a parallel four-bar mechanism.

4. The bellows angle offset test device according to claim 1, characterized in that: Each swing frame includes two swing arms distributed at intervals. The first guide member is a guide groove provided on the opposite side walls of the two swing arms. Two sliders are fixed on the first flange seat, and the two sliders are respectively slidably engaged with the two guide grooves.

5. The bellows angle offset test device according to claim 1, characterized in that: The telescopic mechanism is an automatic telescopic device.

6. The bellows angle offset test device according to claim 1, wherein: The support seat is supported by a lifting device installed in the machine body. The machine body is rotatably connected to two oblique arms symmetrically distributed on both sides of the support seat. The two oblique arms are respectively fixed with second guide members extending in a straight line. The two second flange seats are respectively slidably matched with the two second guide members, and the second flange seats are provided with locking bolts; an angle adjustment mechanism for adjusting the inclination angle of the two oblique arms is installed on the machine body.

7. The bellows angle offset test device according to claim 6, characterized in that: The lifting device is provided with at least two lifting columns extending vertically upward, and the support seat is fixedly supported by the lifting columns.

8. The bellows angle offset testing device according to claim 6, characterized in that: The lower end of the oblique arm extends into the machine body. The angle adjustment mechanism includes a driving mechanism and two pull rods. The lower ends of the two oblique arms are respectively connected to the driving mechanism via a pull rod.

9. The bellows angle offset test device according to claim 1, wherein: The first flange seat and the second flange seat can be sealed and connected to the flange joint at the end of the bellows; at least one of the first flange seat and the second flange seat is connected to an exhaust hose that connects the inner cavity of the bellows with the vacuum generating system.

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