Multi-layer metal corrugated pipe testing equipment and method

Abstract

The invention discloses a multi-layer metal corrugated pipe testing device and method in the technical field of metal corrugated pipe production, the testing device comprises a supporting platform, electric sliding tables distributed in an array mode are arranged on the upper end face of the supporting platform, and testing modules are arranged above the electric sliding tables; the test module comprises an adjustable support assembly, a guide frame, a rotating assembly, a driving assembly and a rotating clamping assembly. The test equipment can simulate the operation states of the corrugated pipe, including a pure stretching state, a stretching height deviation state, a stretching height angle deviation state and a stretching height angle deviation distortion state, and can effectively perform action simulation according to the actual use condition; and the leakage condition in the later use process due to the fact that the simulation test is not in place is avoided.

Description

Technical Field

[0001] This invention relates to the field of metal corrugated pipe manufacturing technology, specifically to a testing device and method for multilayer metal corrugated pipes. Background Technology

[0002] Metal bellows is a type of pipe with a regular, wavy shape. Commonly used metal bellows include those made of carbon steel and stainless steel, as well as steel-lined plastic and aluminum, among others. They are mainly used for non-concentric axial transmission requiring a very small bending radius, irregular bends, expansion and contraction, absorbing thermal deformation of pipelines, or in situations where fixed elbows are inconvenient for installation, for connecting pipes to other pipes or connecting pipes to equipment. Metal bellows are widely used as sensing elements, vibration damping elements, compensating elements, sealing elements, valve elements, and pipe fittings in fields such as automatic control and measuring instruments, vacuum technology, machinery industry, power industry, transportation, and nuclear energy industry.

[0003] Multi-layer metal corrugated pipes use different materials for the inner and outer parts to meet the different requirements of internal and external operating environments. However, multi-layer metal corrugated pipes are generally welded with flanges at both ends during use. Due to vibration, thermal expansion and contraction of the pipes at both ends, the metal corrugated pipe will deform during use, which can easily cause cracks on the inner and outer sides of the metal corrugated pipe and detachment and leakage at the welded ends. Therefore, performance testing is required after the multi-layer metal corrugated pipe is welded. However, most current testing methods are simple air tightness and pressure tests. When simulating actual use, the testing equipment is mostly simple expansion and contraction and shaking tests. The types of tests and the range of motion are too small, and there are few complete simulation testing devices. Therefore, special structural design improvements are needed. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a multilayer metal bellows testing device and method to solve the problems mentioned in the background art.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A multilayer metal bellows testing device includes a support platform, an array of electrically driven slides on the upper surface of the support platform, and a testing module above each of the electrically driven slides.

[0007] The test module includes an adjustable support assembly, a guide frame, a rotating assembly, a drive assembly, and a rotating clamping assembly;

[0008] The adjustable bracket assembly includes a second bracket that can be rotated and adjusted at an angle, a guide frame fixed on the upper surface of the second bracket, a guide groove provided inside the guide frame, the guide groove including a first section, a second section and a third section, and a rotating component including a movable connecting block, with a clamping component that can be rotated and adjusted at the front end of the connecting block.

[0009] The clamping assembly includes a rotatable outer bracket and an inner bracket, which are fixedly connected. A long rotating shaft is provided at the center of the outer bracket and the inner bracket and is fixedly connected through it. An axially arranged movable frame is provided at the front end of the inner bracket. A fixedly connected insertion shaft is provided on the movable frame. An axially arranged rotating locking strip is provided on the outside of the insertion shaft.

[0010] Preferably, the adjustable bracket assembly includes a first bracket, a second bracket rotatably connected above the first bracket, a first motor fixedly connected to the lower end of the second bracket, and a first electric cylinder between the first bracket and the second bracket, the first electric cylinder pushing the second bracket to rotate and adjust the angle.

[0011] Preferably, the lower end of the guide frame is provided with a fixedly connected second motor, the first section, the second section and the third section are connected, and the second section and the third section are arranged in a mirror image of the first section. The two sections have the same structure, and a rotatable lever is provided in the guide groove. The shaft of the second motor is fixedly connected to the lever.

[0012] Preferably, the rotating assembly includes a first rotating bracket, which is rotatably connected to the upper end face of a second bracket. The upper end of the first rotating bracket is provided with a fixedly connected slider, and the slider is provided with a slidingly fitted slide rail. A connecting block is fixedly connected to the front end of the slide rail. The lower end of the slide rail is provided with a rotatably connected guide post, which is inserted into a guide groove for guidance. The connecting block is provided with a fixedly connected angle gauge.

[0013] Preferably, there are two sets of drive components, which are symmetrically arranged on both sides of the slide rail. The drive components include a rotatable second rotating bracket. Both sides of the second rotating bracket are provided with slidable side guide strips. One end of the second rotating bracket is provided with an arc-shaped slot, and the other end of the second rotating bracket is provided with a cylinder that is fixedly connected. The first motor drives the second rotating bracket to rotate. The cylinder extension end is provided with a push frame that is fixedly connected. The push frame is fixedly connected to the tail end of the side guide strip. The cylinder drives the side guide strip to slide through the push frame. After the second rotating bracket rotates to the initial angle, the guide column enters between the side guide strips.

[0014] Preferably, the inner support is provided with an axially arranged adjusting shaft and a sliding slot. The front end of the adjusting shaft is provided with a bevel gear fixedly connected. The outer support is provided with an axially arranged third motor. The rotating shaft of the third motor is fixedly connected to the adjusting shaft. The sliding slot is provided with a slidingly engaged moving block. The long rotating shaft is rotatably connected to the connecting block. The tail end of the long rotating shaft is provided with a fixedly connected pull rod. The pull rod is provided with a fixedly connected pointer. The pointer and scale determine the rotation angle. The front end of the long rotating shaft is provided with an axially arranged planar groove.

[0015] Preferably, the inner support is further provided with a concentric rotating ring, which is rotatably connected to the inner support. The front end face of the rotating ring is provided with a vortex-shaped guide groove, and the rear end face of the rotating ring is provided with an annular rack that meshes with a bevel gear. The back of the moving block is provided with an arc-shaped guide block that slides with the vortex-shaped guide groove.

[0016] Preferably, each of the movable blocks has a through mounting groove inside, and each mounting groove has a fixedly connected linear ranging sensor. The detection end of the linear ranging sensor has a fixedly connected extension rod. The front end of the extension rod is fixedly connected to the planar groove. The movable frame is fixedly connected to the movable block. One end of the insertion shaft has an integrally formed retaining ring. The insertion shaft has a slidingly fitted movable ring. The rotating retaining strip is rotatably connected to the insertion shaft. A spring is provided between the rotating retaining strip and the insertion shaft.

[0017] A bellows testing method for a multilayer metal bellows testing device, the testing method comprising the following steps:

[0018] First, the manufactured double-layer metal bellows is placed between two sets of test modules. The radius of the insert shaft is adjusted according to the position of the mounting holes on the flanges welded to both ends of the double-layer metal bellows. The third motor drives the adjusting shaft to rotate synchronously. When the adjusting shaft rotates, it drives the bevel gear, rack, rotating ring and vortex guide groove to rotate synchronously. The vortex guide groove drives the arc guide block, movable frame and insert shaft to slide along the sliding slot to change the radius. After the radius detected by the linear distance sensor reaches the preset value, it sends a signal to the PLC control system and the third motor stops.

[0019] The electric slide table drives the test modules to move towards each other. The flanges at both ends of the bellows are concentric with the inner and outer supports. The insert shaft is inserted into the mounting holes on the flange. Initially, the moving ring moves away from the rotating clip, and the rotating clip tilts and unfolds. Then, the flange continues to be pushed forward, and the mounting hole squeezes the rotating clip down. After the rotating clip is completely separated from the mounting hole, the spring pushes the rotating clip to unfold. At this time, the retaining ring is inserted into the mounting hole, and the higher end of the rotating clip abuts against the flange. Then, the test modules move away from each other, and the bellows is pulled to the default initial length through the flange. At this time, the bellows is suspended in the air.

[0020] When simulating the simple tensile state of the bellows, the electric slide table drives the test module to move towards and away from each other, thereby pulling the bellows to expand and contract.

[0021] When simulating the stretching and height deviation of the bellows, the first electric cylinder can drive the second bracket to adjust the angle deviation, so that the guide frame, rotating component, drive component and rotating clamping component can simultaneously shift the angle. At this time, the electric slide table drives the test module to move towards and away from each other, thereby pulling the bellows for testing.

[0022] When simulating the tension, height, and angle deviation of the bellows, first adjust the angle of the second bracket, then select the specified direction of the guide groove according to the required running direction. The second motor drives the lever to rotate to adjust and connect the first and second sections or the first and third sections. After the second rotating bracket rotates to the initial angle, the guide column enters between the side guide bars, and the side guide bars extend forward. When the second rotating bracket rotates, it drives the guide column to move through the side guide bars, thereby driving the slide rail and connecting block to move back and forth. When the connecting block moves, it drives the clamping assembly and both ends of the bellows to move. At this time, the electric slide table drives the test module to move towards and away from each other, thereby pulling the bellows for testing.

[0023] When simulating the state of bellows tension, height, angle deviation, and torsion, first adjust the angle of the second bracket and select a suitable guide groove. Then pull the pull rod to rotate the clamping assembly by an angle. After adjusting to the specified angle, fix the pull rod. At this time, the electric slide table drives the test module to move towards and away from each other, thereby pulling the bellows for testing.

[0024] After the simulation test is completed for a specified time, the electric slide table drives the test module back to the initial position, pulls the moving ring towards the retaining ring, and the moving ring presses the rotating retaining strip into the insert shaft, thereby unlocking the flanges at both ends of the bellows from the clamping assembly, and the bellows is taken out for air tightness testing.

[0025] The beneficial effects of this invention are:

[0026] The testing equipment of this invention can automatically adjust the spacing of the testing modules, thereby driving the bellows to perform expansion and contraction performance testing. The clamping assembly adjusts the radius of the insertion shaft according to the position of the mounting hole on the flange. After the radius of the insertion shaft detected by the linear distance sensor reaches the preset value, it sends a signal to the PLC control system to stop the machine, thereby inserting the insertion shaft into the mounting hole on the flange.

[0027] In the testing equipment of this invention, the insert shaft in the testing module adopts a movable snap-fit ​​structure. When the flange is installed, the moving ring moves away from the rotating clip, and the rotating clip tilts and unfolds. When the flange moves forward, the mounting hole squeezes the rotating clip down. After the rotating clip is completely separated from the mounting hole, the spring pushes the rotating clip to unfold, and the snap ring is inserted into the mounting hole. The higher end of the rotating clip abuts against the flange. When the flange is disassembled, the moving ring is pulled toward the snap ring, and the moving ring presses the rotating clip into the insert shaft, thereby unlocking the flanges at both ends of the bellows from the clamping assembly. The entire disassembly and installation process is simple and quick.

[0028] The testing equipment of this invention can simulate the operating state of bellows, including simple tension state, tension height deviation state, tension height angle deviation state, and tension height angle deviation torsion state. It can effectively simulate the action according to the actual use situation and avoid leakage in the later use process due to inadequate simulation testing. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the test equipment in an embodiment of the present invention;

[0031] Figure 2 This is a side view of the adjustable support assembly structure in an embodiment of the present invention;

[0032] Figure 3 This is a side view of the test module structure in an embodiment of the present invention;

[0033] Figure 4 This is a top view of the test module structure in an embodiment of the present invention;

[0034] Figure 5 This is a top view of the guide frame structure in an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the rotating assembly in an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the structure when the rotating component and the clamping component are used together in an embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram of the structure of the driving component in an embodiment of the present invention;

[0038] Figure 9This is a schematic diagram of the clamping component in an embodiment of the present invention. Figure 1 ;

[0039] Figure 10 This is a schematic diagram of the clamping component in an embodiment of the present invention. Figure 2 ;

[0040] Figure 11 This is a partial structural diagram of the clamping component in an embodiment of the present invention. Figure 1 ;

[0041] Figure 12 This is a partial structural diagram of the clamping component in an embodiment of the present invention. Figure 2 ;

[0042] Figure 13 For the present invention Figure 12 Enlarged schematic diagram of the structure at point A in the middle;

[0043] Figure 14 This is a schematic diagram of the structure when the movable block and the movable frame are used in combination in an embodiment of the present invention;

[0044] Figure 15 This is a cross-sectional view of the movable frame in an embodiment of the present invention;

[0045] In the diagram: 1. Support platform; 2. Electric slide table; 3. Adjustable bracket assembly; 4. Guide frame; 5. Rotating assembly; 6. Drive assembly; 7. Clamping assembly; 31. First bracket; 32. Second bracket; 33. First motor; 34. First electric cylinder; 41. Second motor; 42. Guide groove; 51. First rotating bracket; 52. Slider; 53. Slide rail; 54. Connecting block; 55. Guide column; 61. Second rotating bracket; 62. Side guide strip; 63. Cylinder; 64. Coupling; 71. Inner bracket; 72. Outer bracket; 73. Long rotating shaft; 74. Rotating ring; 75. Moving block; 76. Movable frame; 411. Lever; 421 1. First paragraph; 422. Second paragraph; 423. Third paragraph; 541. Bearing; 542. Angle ruler; 611. Arc-shaped slot; 631. Push frame; 711. Adjusting shaft; 712. Bevel gear; 713. Sliding slot; 721. Third motor; 731. Pull rod; 732. Pointer; 733. Knob; 734. Flat groove; 741. Rack; 742. Vortex guide groove; 751. Arc-shaped guide block; 752. Mounting groove; 753. Linear distance sensor; 761. Snap ring; 762. Insert shaft; 763. Moving ring; 764. Rotating clip; 765. Spring; 5421. Scale; 7531. Extension rod. Detailed Implementation

[0046] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] Please see Figures 1 to 15 As shown, this embodiment provides a multilayer metal corrugated pipe testing device. The testing device includes a support platform 1, and an array of electric slides 2 are provided on the upper surface of the support platform 1. Each electric slide 2 is provided with a testing module above it.

[0048] Furthermore, the test module includes an adjustable support assembly 3, a guide frame 4, a rotating assembly 5, a drive assembly 6, and a rotating clamping assembly 7;

[0049] Furthermore, the adjustable support assembly 3 includes a first support 31, a second support 32 rotatably connected above the first support 31, a first motor 33 fixedly connected to the lower end of the second support 32, a first electric cylinder 34 between the first support 31 and the second support 32, the tail end of the first electric cylinder 34 rotatably connected to the first support 31, the telescopic end of the first electric cylinder 34 rotatably connected to the second support 32, and the first electric cylinder 34 pushes the second support 32 to rotate and adjust the angle.

[0050] Furthermore, the guide frame 4 is fixed on the upper surface of the second bracket 32. When the second bracket 32 ​​rotates, it drives the guide frame 4 to rotate synchronously. The lower end of the guide frame 4 is provided with a fixedly connected second motor 41, and the guide frame 4 is provided with a guide groove 42.

[0051] Specifically, the guide groove 42 includes a first section 421, a second section 422 and a third section 423, which are connected. The second section 422 and the third section 423 are arranged in a mirror image relative to the first section 421 and have the same structure.

[0052] The guide groove 42 is provided with a rotatable lever 411. The shaft of the second motor 41 is fixedly connected to the lever 411. The second motor 41 drives the lever 411 to rotate, thereby connecting the first section 421 and the second section 422 or the first section 421 and the third section 423 to form two left-right symmetrical guide grooves.

[0053] Furthermore, the rotating assembly 5 includes a first rotating bracket 51, which is rotatably connected to the upper end face of the second bracket 32. The upper end of the first rotating bracket 51 is provided with a fixedly connected slider 52, and the slider 52 is provided with a slidingly engaged slide rail 53. The front end of the slide rail 53 is provided with a fixedly connected connecting block 54, and the lower end of the slide rail 53 is provided with a rotatably connected guide post 55, which is inserted into the guide groove 42 for guidance.

[0054] Specifically, when the first rotating bracket 51 rotates, the guide column 55 drives the slide rail 53 to rotate along the guide groove 42. The front end of the connecting block 54 is provided with a bearing 541, and the connecting block 54 is provided with a fixedly connected angle ruler 542. The angle ruler 542 is provided with a through arc groove, and the outer side of the arc groove is provided with a scale 5421.

[0055] Furthermore, there are two sets of drive components 6, which are symmetrically arranged on both sides of the slide rail 53. The drive component 6 includes a rotatable second rotating bracket 61. Both sides of the second rotating bracket 61 are provided with slidable side guide strips 62. One end of the second rotating bracket 61 is provided with an arc-shaped slot 611, and the other end of the second rotating bracket 61 is provided with a fixedly connected cylinder 63.

[0056] Specifically, the lower end of the second rotating bracket 61 is provided with a fixedly connected coupling 64. The coupling 64 fixes the rotating shaft of the first motor 33 to the second rotating bracket 61. The first motor 33 drives the second rotating bracket 61 to rotate. The telescopic end of the cylinder 63 is provided with a fixedly connected push frame 631. The push frame 631 is fixedly connected to the tail end of the side guide strip 62. The cylinder 63 drives the side guide strip 62 to slide through the push frame 631, thereby changing the length of the relative arc-shaped slot 611. After the second rotating bracket 61 rotates to the initial angle, the guide post 55 enters between the side guide strips 62, and the side guide strip 62 extends forward. When the second rotating bracket 61 rotates, it drives the guide post 55 to move through the side guide strip 62, thereby driving the slide rail 53 and the connecting block 54 to move.

[0057] The clamping assembly 7 includes a rotatable outer bracket 72 and an inner bracket 71, which are fixedly connected. A long rotating shaft 73 is provided through and fixedly connected at the center of the outer bracket 72 and the inner bracket 71. An axially arranged movable frame 76 is provided at the front end of the inner bracket 71. A fixedly connected insertion shaft 762 is provided on the movable frame 76. An axially arranged rotating locking strip 764 is provided on the outside of the insertion shaft 762.

[0058] Specifically, the inner support 71 is provided with an axially arranged adjusting shaft 711 and a sliding slot 713. The adjusting shaft 711 is rotatable, and the front end of the adjusting shaft 711 is provided with a bevel gear 712 fixedly connected. The outer support 72 is provided with an axially arranged third motor 721 on the outside. The rotating shaft of the third motor 721 is fixedly connected to the adjusting shaft 711, and the third motor 721 drives the adjusting shaft 711 to rotate synchronously.

[0059] The long rotating shaft 73 passes through the bearing 541. The tail end of the long rotating shaft 73 is provided with a fixedly connected pull rod 731. The pull rod 731 is provided with a fixedly connected pointer 732 and an adjustable knob 733. The knob 733 passes through the angle gauge 542. Pulling the pull rod 731 can drive the long rotating shaft 73, the outer bracket 72 and the inner bracket 71 to rotate. The pointer 732 and the scale 5421 determine the rotation angle. Then, tightening the knob 733 fixes the position of the pull rod 731 and the angle gauge 542. The front end of the long rotating shaft 73 is provided with an axially arranged flat groove 734.

[0060] The inner support 71 is also provided with a concentric rotating ring 74. The rotating ring 74 is rotatably connected to the inner support 71. The front end face of the rotating ring 74 is provided with a vortex guide groove 742, and the rear end face of the rotating ring 74 is provided with an annular rack 741. The rack 741 meshes with a bevel gear 712. When the adjusting shaft 711 rotates, it drives the bevel gear 712, the rack 741, and the rotating ring 74 to rotate synchronously.

[0061] Each sliding slot 713 is equipped with a slidingly engaged moving block 75. The back of the moving block 75 is equipped with an arc-shaped guide block 751. The arc-shaped guide block 751 is slidably engaged with the vortex guide groove 742. When the rotating ring 74 rotates, it drives the arc-shaped guide block 751 to slide along the sliding slot 713 through the vortex guide groove 742 to change the radius. Each moving block 75 is equipped with a through mounting groove 752. Each mounting groove 752 is equipped with a fixedly connected linear ranging sensor 753. The detection end of the linear ranging sensor 753 is equipped with a fixedly connected extension rod 7531. The front end of the extension rod 7531 is fixedly connected to the plane groove 734. When the moving block 75 moves, the linear ranging sensor 753 detects the change in its radius.

[0062] The movable frame 76 is fixedly connected to the movable block 75. One end of the insertion shaft 762 is provided with an integrally formed retaining ring 761. The insertion shaft 762 is provided with a slidingly engaged moving ring 763. The rotating retaining strip 764 is rotatably connected to the insertion shaft 762. A spring 765 is provided between the rotating retaining strip 764 and the insertion shaft 762. One end of the spring 765 is rotatably connected to the rotating retaining strip 764, and the other end of the spring 765 is rotatably connected to the insertion shaft 762. When the rotating retaining strip 764 is not pressed by external force, the spring 765 pushes the rotating retaining strip 764 to rotate and unfold. When the sliding moving ring 763 moves toward the retaining ring 761, the moving ring 763 presses the rotating retaining strip 764 into the insertion shaft 762.

[0063] The testing method for bellows includes the following steps:

[0064] First, the manufactured double-layer metal corrugated pipe is placed between two sets of test modules. The radius of the insert shaft 762 is adjusted according to the position of the mounting holes on the flanges welded to both ends of the double-layer metal corrugated pipe. The third motor 721 drives the adjusting shaft 711 to rotate synchronously. When the adjusting shaft 711 rotates, it drives the bevel gear 712, rack 741, rotating ring 74 and vortex guide groove 742 to rotate synchronously. The vortex guide groove 742 drives the arc guide block 751, movable frame 76 and insert shaft 762 to slide along the sliding slot 713 to change the radius. After the radius of the insert shaft 762 detected by the linear distance sensor 753 reaches the preset value, it sends a signal to the PLC control system, and the third motor 721 stops.

[0065] The electric slide 2 drives the test modules to move towards each other. The flanges at both ends of the bellows are concentric with the inner support 71 and the outer support 72. The insert shaft 762 is inserted into the mounting hole on the flange. Initially, the moving ring 763 moves away from the rotating clip 764. The rotating clip 764 tilts and unfolds. Then the flange continues to be pushed forward. The mounting hole squeezes the rotating clip 764 down. After the rotating clip 764 is completely disengaged from the mounting hole, the spring 765 pushes the rotating clip 764 to unfold. At this time, the retaining ring 761 is inserted into the mounting hole. The higher end of the rotating clip 764 abuts against the flange. Then the test modules move away from each other. The flange pulls the bellows to the default initial length. At this time, the bellows is suspended.

[0066] When simulating the simple tension state of the bellows, the electric slide 2 drives the test module to move towards and away from each other, thereby pulling the bellows to extend and retract;

[0067] When simulating the stretching and height deviation of the bellows, the first electric cylinder 34 can drive the second bracket 32 ​​to adjust the angle deviation, so that the guide frame 4, the rotating component 5, the drive component 6 and the rotating clamping component 7 can simultaneously perform angle deviation. At this time, the electric slide table 2 drives the test module to move towards and away from each other, thereby pulling the bellows for testing.

[0068] When simulating the stretching, height, and angle deviation of the bellows, first adjust the angle of the second bracket 32, and then select the specified direction of the guide groove 42 according to the required running direction. The second motor 41 drives the lever 411 to rotate to adjust so that the first section 421 and the second section 422 are connected or the first section 421 and the third section 423 are connected. After the second rotating bracket 61 rotates to the initial angle, the guide column 55 enters between the side guide bars 62, and the side guide bars 62 extend forward. When the second rotating bracket 61 rotates, it drives the guide column 55 to move through the side guide bars 62, thereby driving the slide rail 53 and the connecting block 54 to move back and forth. When the connecting block 54 moves, it drives the clamping assembly 7 and the two ends of the bellows to move. At this time, the electric slide table 2 drives the test module to move towards and away from each other, thereby pulling the bellows for testing.

[0069] When simulating the state of bellows tension, height, angle deviation, and torsion, first adjust the angle of the second bracket 32 ​​and select the appropriate guide groove 42. Then pull the pull rod 731 to rotate the clamping assembly 7. After adjusting to the specified angle, fix the pull rod 731. At this time, the electric slide table 2 drives the test module to move towards and away from each other, thereby pulling the bellows for testing.

[0070] After the simulated test is completed for a specified time, the electric slide 2 drives the test module back to the initial position, pulls the moving ring 763 toward the retaining ring 761, and the moving ring 763 presses the rotating retaining strip 764 into the insert shaft 762, thereby unlocking the flanges at both ends of the bellows from the clamping assembly 7, and taking out the bellows for air tightness testing to detect the overall sealing performance under simulated long-term use conditions.

[0071] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 this invention and simplifying the description, 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 limitations on this invention.

[0072] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0073] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0074] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A testing device for multilayer metal bellows, the testing device comprising a support platform (1), wherein an array of electrically driven slides (2) are provided on the upper surface of the support platform (1), characterized in that, Each of the electric slide tables (2) is equipped with a test module above it; The test module includes an adjustable support assembly (3), a guide frame (4), a rotating assembly (5), a drive assembly (6), and a rotating clamping assembly (7); The adjustable bracket assembly (3) includes a second bracket (32) with an adjustable angle, a guide frame (4) fixed on the upper surface of the second bracket (32), a guide groove (42) provided in the guide frame (4), the guide groove (42) including a first section (421), a second section (422) and a third section (423), and a rotating assembly (5) including a movable connecting block (54), the front end of the connecting block (54) being provided with a clamping assembly (7) with an adjustable angle; The clamping assembly (7) includes a rotatable outer bracket (72) and an inner bracket (71), which are fixedly connected. A long rotating shaft (73) is provided through and fixedly connected at the center of the outer bracket (72) and the inner bracket (71). An axially arranged movable frame (76) is provided at the front end of the inner bracket (71). A fixedly connected insertion shaft (762) is provided on the movable frame (76), and an axially arranged rotating locking strip (764) is provided on the outside of the insertion shaft (762).

2. The multilayer metal bellows testing device according to claim 1, characterized in that, The adjustable bracket assembly (3) includes a first bracket (31), a second bracket (32) rotatably connected above the first bracket (31), a first motor (33) fixedly connected at the lower end of the second bracket (32), and a first electric cylinder (34) between the first bracket (31) and the second bracket (32). The first electric cylinder (34) pushes the second bracket (32) to rotate and adjust the angle.

3. The multilayer metal bellows testing device according to claim 2, characterized in that, The guide frame (4) is provided with a fixedly connected second motor (41) at the lower end. The first section (421), the second section (422) and the third section (423) are connected. The second section (422) and the third section (423) are arranged in a mirror image relative to the first section (421). They have the same structure. A rotatable lever (411) is provided in the guide groove (42). The shaft of the second motor (41) is fixedly connected to the lever (411).

4. The multilayer metal bellows testing device according to claim 3, characterized in that, The rotating assembly (5) includes a first rotating bracket (51), which is rotatably connected to the upper end face of the second bracket (32). The upper end of the first rotating bracket (51) is provided with a fixedly connected slider (52), and the slider (52) is provided with a sliding rail (53) in sliding fit. The connecting block (54) is fixedly connected to the front end of the rail (53). The lower end of the rail (53) is provided with a rotatably connected guide post (55), which is inserted into the guide groove (42) for guidance. The connecting block (54) is provided with a fixedly connected angle ruler (542).

5. The multilayer metal bellows testing device according to claim 4, characterized in that, The drive assembly (6) has two sets and is symmetrically arranged on both sides of the slide rail (53). The drive assembly (6) includes a rotatable second rotating bracket (61). Both sides of the second rotating bracket (61) are provided with slidable side guide strips (62). One end of the second rotating bracket (61) is provided with an arc-shaped slot (611). The other end of the second rotating bracket (61) is provided with a cylinder (63) that is fixedly connected. The first motor (33) drives the second rotating bracket (61) to rotate. The telescopic end of the cylinder (63) is provided with a push frame (631) that is fixedly connected. The push frame (631) is fixedly connected to the tail end of the side guide strip (62). The cylinder (63) drives the side guide strip (62) to slide through the push frame (631). After the second rotating bracket (61) rotates to the initial angle, the guide post (55) enters between the side guide strips (62).

6. The multilayer metal bellows testing device according to claim 5, characterized in that, The inner support (71) is provided with an axially arranged adjusting shaft (711) and a sliding slot (713). The front end of the adjusting shaft (711) is provided with a fixedly connected bevel gear (712). The outer support (72) is provided with an axially arranged third motor (721). The rotating shaft of the third motor (721) is fixedly connected to the adjusting shaft (711). The sliding slot (713) is provided with a slidingly engaged moving block (75). The long rotating shaft (73) is rotatably connected to the connecting block (54). The tail end of the long rotating shaft (73) is provided with a fixedly connected pull rod (731). The pull rod (731) is provided with a fixedly connected pointer (732). The pointer (732) and the scale (5421) determine the rotation angle. The front end of the long rotating shaft (73) is provided with an axially arranged planar slot (734).

7. The multilayer metal bellows testing device according to claim 6, characterized in that, The inner support (71) is also provided with a concentric rotating ring (74), which is rotatably connected to the inner support (71). The front end face of the rotating ring (74) is provided with a vortex guide groove (742), and the rear end face of the rotating ring (74) is provided with an annular rack (741). The rack (741) meshes with a bevel gear (712). The back side of the moving block (75) is provided with an arc-shaped guide block (751), which slides with the vortex guide groove (742).

8. The multilayer metal bellows testing device according to claim 7, characterized in that, Each of the movable blocks (75) has a through mounting groove (752) inside. Each mounting groove (752) has a fixedly connected linear ranging sensor (753). The detection end of the linear ranging sensor (753) has a fixedly connected extension rod (7531). The front end of the extension rod (7531) is fixedly connected to the plane groove (734). The movable frame (76) is fixedly connected to the movable block (75). One end of the insertion shaft (762) has an integrally formed retaining ring (761). The insertion shaft (762) has a slidingly fitted moving ring (763). The rotating retaining bar (764) is rotatably connected to the insertion shaft (762). A spring (765) is provided between the rotating retaining bar (764) and the insertion shaft (762).

9. A bellows testing method for a multilayer metal bellows testing device as described in claim 7, characterized in that, The testing method includes the following steps: First, the double-layer metal corrugated pipe is placed between the two sets of test modules. The radius of the insert shaft (762) is adjusted according to the position of the mounting holes on the flanges welded at both ends of the double-layer metal corrugated pipe. The third motor (721) drives the adjusting shaft (711) to rotate synchronously. When the adjusting shaft (711) rotates, it drives the bevel gear (712), rack (741), rotating ring (74) and vortex guide groove (742) to rotate synchronously. The vortex guide groove (742) drives the arc guide block (751), movable frame (76), insert shaft (762) to slide along the sliding slot (713) to change the radius. After the radius of the insert shaft (762) detected by the linear distance sensor (753) reaches the preset value, it sends a signal to the PLC control system, and the third motor (721) stops. The electric slide (2) drives the test modules to move towards each other and get closer. The flanges at both ends of the bellows are concentric with the inner support (71) and the outer support (72). The insert shaft (762) is inserted into the mounting hole on the flange. Initially, the moving ring (763) moves away from the rotating clip (764), and the rotating clip (764) tilts and unfolds. Then the flange continues to be pushed forward, and the mounting hole squeezes the rotating clip (764) down. After the rotating clip (764) is completely separated from the mounting hole, the spring (765) pushes the rotating clip (764) to unfold. At this time, the retaining ring (761) is inserted into the mounting hole, and the high end of the rotating clip (764) abuts against the flange. Then the test modules move away from each other and pull the bellows to the default initial length through the flange. At this time, the bellows is suspended. When simulating the simple tension state of the bellows, the electric slide (2) drives the test module to move towards and away from each other, thereby pulling the bellows to stretch and contract; When simulating the state of bellows stretching and height deviation, the first electric cylinder (34) can drive the second bracket (32) to adjust the angle deviation, so that the guide frame (4), rotating component (5), driving component (6) and rotating clamping component (7) can simultaneously perform angle deviation. At this time, the electric slide (2) drives the test module to move towards each other and away from each other, thereby pulling the bellows for testing. When simulating the state of bellows stretching, height and angle deviation, first adjust the angle of the second bracket (32), then select the specified direction of the guide groove (42) according to the required running direction. The second motor (41) drives the lever (411) to rotate to adjust so that the first section (421) and the second section (422) are connected or the first section (421) and the third section (423) are connected. After the second rotating bracket (61) rotates to the initial angle, the guide column (55) enters between the side guide strips (62). The side guide strips (62) extend forward. When the second rotating bracket (61) rotates, it drives the guide column (55) to move through the side guide strips (62), thereby driving the slide rail (53) and the connecting block (54) to move back and forth. When the connecting block (54) moves, it drives the clamping assembly (7) and the two ends of the bellows to move. At this time, the electric slide table (2) drives the test module to move towards and away from each other, thereby pulling the bellows to perform the test. When simulating the state of bellows tension, height, angle deviation and torsion, first adjust the angle of the second bracket (32) and select the appropriate guide groove (42), then pull the pull rod (731) to make the clamping assembly (7) rotate the angle. After adjusting to the specified angle, fix the pull rod (731). At this time, the electric slide (2) drives the test module to move towards each other and away from each other, thereby pulling the bellows to perform the test. After the simulation test is completed for a specified time, the electric slide (2) drives the test module back to the initial position, pulls the moving ring (763) towards the retaining ring (761), and the moving ring (763) presses the rotating retaining bar (764) into the insert shaft (762), thereby unlocking the flanges at both ends of the bellows from the clamping assembly (7), and taking out the bellows for air tightness testing.

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