A coupling performance testing device and method for a group of bellows assemblies

Abstract

The application discloses a kind of coupling performance test device and method of group corrugated pipe assembly, it is related to corrugated pipe performance test technical field, including connecting assembly, installation assembly and torsion mechanism;Installation assembly includes top flange, intermediate flange, bottom flange, first test space for placing first corrugated pipe assembly is formed between top flange and intermediate flange, second test space for placing second corrugated pipe assembly is formed between intermediate flange and bottom flange, connecting assembly can drive intermediate flange to move, the size of first test space and second test space is changed by the movement of connecting assembly drive intermediate flange between top flange and bottom flange moves;Torsion mechanism includes torsion sleeve disc, and one end of first corrugated pipe assembly and one end of second corrugated pipe assembly are connected with torsion sleeve disc respectively, and torsion sleeve disc is relatively rotated with intermediate flange, and torsion sleeve disc is used to be connected with torsion chuck.The application improves test efficiency.

Description

Technical Field

[0001] This invention relates to the field of bellows performance testing technology, and in particular to a device and method for testing the coupling performance of a group of bellows assemblies. Background Technology

[0002] A bellows assembly consists of a bellows body and upper and lower flanges located at both ends of the bellows body. The flanges at both ends are used to connect the bellows body to the pipeline, or to work in conjunction with other structures. The connecting flanges are typically made of carbon steel or stainless steel to ensure a strong and airtight connection. Because the bellows body is formed by multiple layers of corrugations, it increases the flexibility and bendability of the pipeline, enabling it to withstand deformations such as thermal expansion and contraction and vibration. Therefore, the bellows assembly requires extensive performance testing after molding to ensure its performance. Stiffness is the most important performance characteristic of a bellows assembly; it is a key parameter that ensures the overall structural function of the installation and affects the lifespan of the bellows assembly and its overall structure.

[0003] The typical testing method for bellows assemblies involves placing the assembly on a test bench equipped with a clamping head. This clamping head holds the test block and applies force to the bellows assembly along its axial direction. Before applying force, a single bellows assembly to be tested must be placed on the bench at the designated testing position, and the clamping head's movement causes the assembly to move axially. However, current testing methods prevent the bellows assembly from shifting under axial pressure. Therefore, the assembly must be moved and positioned close to a vertical beam on one side of the bench during testing. This means that to ensure accurate axial performance testing, only a single bellows can be tested, and only ordinary bellows assemblies with very low axial forces can be tested, resulting in low efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for testing the coupling performance of grouped bellows assemblies, so as to solve the problems existing in the prior art and improve the testing efficiency.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a coupling performance testing device for a group of bellows assemblies, comprising: a connecting assembly, a mounting assembly, and a torsion mechanism; The connecting component is used to connect with the tension / compression clamp; The mounting assembly includes a top flange, an intermediate flange, and a bottom flange. A first test space for placing a first bellows assembly is formed between the top flange and the intermediate flange. A second test space for placing a second bellows assembly is formed between the intermediate flange and the bottom flange. The connecting assembly can drive the intermediate flange to move. The movement of the connecting assembly drives the intermediate flange to move between the top flange and the bottom flange, thereby changing the size of the first test space and the second test space. The torsion mechanism includes a torsion sleeve, which is connected to the first bellows assembly and the second bellows assembly respectively. The torsion sleeve rotates relative to the intermediate flange and is used to connect with a torsion clamp.

[0006] In some specific embodiments, the intermediate flange includes an intermediate concave flange and an intermediate convex flange, which are fixedly connected and form a groove for restricting the torsion sleeve.

[0007] In some specific embodiments, at least two fixed slide rod assemblies are also included. The two fixed slide rod assemblies are evenly distributed along the circumference of the mounting assembly. Each fixed slide rod assembly includes a fixed slide rod, one end of which is fixedly connected to the top flange, the other end of which is fixedly connected to the bottom flange, and the fixed slide rod is slidably connected to the intermediate flange.

[0008] In some specific embodiments, at least two movable slide rod assemblies are also included. The two movable slide rod assemblies are evenly distributed around the circumference of the mounting assembly. Each movable slide rod assembly includes a movable slide rod. One end of the movable slide rod is fixedly connected to the connecting assembly, and the other end of the movable slide rod is fixedly connected to the intermediate flange. The movable slide rod is slidably connected to the top flange.

[0009] In some specific embodiments, the movable slide bar assembly and the fixed slide bar assembly are arranged alternately along the circumference of the mounting assembly.

[0010] In some specific designs, the first bellows assembly and the second bellows assembly are coaxially arranged, and both the first bellows assembly and the second bellows assembly are provided with a gas pipe connector for introducing gas.

[0011] In some specific designs, a support assembly is also included, to which the bottom flange is connected.

[0012] In some specific solutions, a torsion frame is also included, which is fixedly connected to the torsion sleeve, and the torsion clamp is disposed on the torsion frame.

[0013] The present invention also provides a method for testing the coupling stiffness using the coupling performance testing device of the grouped bellows assembly, comprising: A device for testing the coupling performance of assembled bellows assemblies; Inflate the first and second bellows assemblies with air to bring the air pressure inside them up to the required level. Keeping the torsion chuck and tension / compression chuck stationary, monitor the axial force value of the tension / compression chuck. F 0+ Monitor the torque value of the torsion chuck. M 01 ; Continue to keep the torsion chuck stationary: drive the intermediate flange to move through the tension chuck, so that the first bellows assembly is in a compressed state and the second bellows assembly is in a stretched state; The distance traveled by the tension / compression chuck is denoted as... d + Monitor the axial force value of the tension / compression chuck. Monitor the torque value of the torsion chuck. M t1 The axial tensile and compressive stiffness value at this time Circumferential torsional coupling stiffness value k t1 for: , ; The tension / compression chuck returns to its original position, while the torsion chuck and tension / compression chuck remain stationary. The axial force value of the tension / compression chuck is monitored. F 0- Monitor the torque value of the torsion chuck. M 02 ; Continue to keep the torsion chuck stationary: drive the intermediate flange to move through the tension chuck, so that the first bellows assembly is in a stretched state and the second bellows assembly is in a compressed state; The distance traveled by the tension / compression chuck is denoted as... d - Monitor the axial force value of the tension / compression chuck. Monitor the torque value of the torsion chuck. M t2 The axial tensile and compressive stiffness value at this time Circumferential torsional coupling stiffness value k t2 for: , ; This leads to the axial stiffness of the first and second bellows assemblies when constrained in the circumferential torsional degree of freedom.k 11 Circumferential torsional coupling stiffness of the first and second bellows assemblies k 21 for: , ; Keeping the torsion chuck and tension / compression chuck stationary, monitor the axial force value of the tension / compression chuck. F 0 Monitor the torque value of the torsion chuck. M 0 ; Continue to keep the tension and compression chuck stationary: drive the torsion sleeve to move by twisting the chuck, so that the first bellows assembly and the second bellows assembly are in a torsion state; The angular displacement of the torsion chuck is denoted as i 0 Monitor the axial force value of the tension / compression chuck. Monitor the torque value of the torsion chuck. M t The circumferential torsional stiffness value at this time k 22 and axial tension-compression coupling stiffness value k 12 for: , ; The stiffness matrices of the first and second bellows assemblies are obtained. K for: .

[0014] In some specific schemes, the shaft-torsional coupling coefficient or for: or The closer it is to 0, the weaker the coupling between axial tension / compression stiffness and circumferential torsional coupling stiffness during axial tension / compression, and the weaker the coupling between circumferential torsional stiffness and axial tension / compression coupling stiffness during circumferential torsion. or The larger the value, the stronger the coupling between the axial tensile / compressive stiffness and the circumferential torsional coupling stiffness during axial tension / compression, and the stronger the coupling between the circumferential torsional stiffness and the axial tensile / compressive coupling stiffness during circumferential torsion.

[0015] The present invention achieves the following technical effects compared to the prior art: This invention fixes the upper and lower ends of the mounting assembly to the connecting assembly and the supporting assembly, respectively. Furthermore, the mounting assembly is equipped with a top flange, a middle flange, and a bottom flange spaced apart, with the middle flange connected to the connecting assembly. Movement of the connecting assembly drives movement of the middle flange, thereby changing the size of the first and second test spaces. This invention can simultaneously measure two bellows assemblies, improving testing efficiency and saving significant space. Moreover, when the bellows assembly is a special type, it generates a large axial force after pressurization. This invention achieves force balance between the two bellows assemblies being tested, ensuring the strength of the testing device. In addition, displacement compensation is achieved, improving the accuracy of stiffness testing compared to single-direction stiffness testing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a coupling performance testing device for a group of bellows assemblies in some embodiments of the present invention. Figure 2 This is a cross-sectional view of the coupling performance testing device for grouped bellows assemblies in some embodiments of the present invention. Figure 3 This is a detailed schematic diagram showing the connection relationship between the torsion mechanism, the first bellows assembly, and the second bellows assembly in some embodiments of the present invention. Figure 4 This is a schematic diagram illustrating the connection between the top flange and the first bellows assembly in some embodiments of the present invention. Figure one ; Figure 5 This is a schematic diagram illustrating the connection between the top flange and the first bellows assembly in some embodiments of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the bottom flange and support assembly in some embodiments of the present invention; In the diagram: 1. Connecting assembly; 11. Lifting flange; 111. Lifting threaded hole; 12. Clamping rod; 13. Pull-compression chuck; 2. Support assembly; 21. Transition flange; 211. Fixing hole; 212. Mounting hole; 22. Support column; 221. Mounting pin; 3. Torsion mechanism; 31. Torsion sleeve; 311. Locking stud; 312. Locking nut; 32. Torsion bar; 33. Connecting rod; 34. Torsion chuck; 4. First test space; 41. Top flange; 411. Device hole; 412. Air pipe connector; 413. Plug ; 42. Intermediate concave flange; 400. First bellows assembly; 4001. First upper flange; 4002. First lower flange; 4003. Locking screw; 5. Second test space; 51. Intermediate flat flange; 52. Bottom flange; 500. Second bellows assembly; 5001. Second upper flange; 6. Fixed slide rod assembly; 61. Fixed slide rod; 62. Fixed nut pair; 621. Fixed nut unit; 63. Guide sleeve; 631. Guide pin; 7. Moving slide rod assembly; 71. Moving slide rod; 72. Moving nut pair; 721. Moving nut unit. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0019] The purpose of this invention is to provide a device and method for testing the coupling performance of grouped bellows assemblies, so as to solve the problems existing in the prior art and improve the testing efficiency.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1 like Figure 1 to Figure 6 As shown, this embodiment provides a coupling performance testing device for a group of bellows assemblies, including: a connecting assembly 1, a mounting assembly, and a torsion mechanism 3; Connection component 1 is used to connect with tension / compression clamp 13; The mounting assembly includes a top flange 41, an intermediate flange, and a bottom flange 52 arranged from top to bottom. A first test space 4 for placing a first bellows assembly 400 is formed between the top flange 41 and the intermediate flange. A second test space 5 for placing a second bellows assembly 500 is formed between the intermediate flange and the bottom flange 52. The connecting assembly 1 can drive the intermediate flange to move. The movement of the connecting assembly 1 drives the intermediate flange to move between the top flange 41 and the bottom flange 52, thereby changing the size of the first test space 4 and the second test space 5. The torsion mechanism 3 includes a torsion sleeve 31, which is connected to the end of the first bellows assembly 400 near the second bellows assembly 500 (first lower flange 4002) and the end of the second bellows assembly 500 near the first bellows assembly 400 (second upper flange 5001). The torsion sleeve 31 rotates relative to the intermediate flange. The rotation axis of the torsion sleeve 31 is the axis of the mounting assembly. The torsion sleeve 31 is used to connect with the torsion clamp 34.

[0022] In some specific embodiments, the connecting assembly 1 includes a lifting flange 11, which is located above the top flange 41. The design clearance between the lifting flange 11 and the top flange 41 is determined by the position of the moving nut 72 of the moving slide rod assembly 7 locking the lifting flange 11. A lifting threaded hole 111 is provided at the center of the lifting flange 11. The clamping rod 12 is provided with external threads on its exterior and is fixedly connected to the lifting threaded hole 111 of the lifting flange 11. A tension / compression chuck 13 is fixedly mounted on the clamping rod 12. A tension / compression sensor and a displacement sensor are provided on the tension / compression chuck 13. The tension / compression sensor is used to monitor the axial force value of the tension / compression chuck 13 and a display screen can be provided to display the axial force value. The displacement sensor is used to monitor the axial displacement of the tension / compression chuck 13.

[0023] In some specific embodiments, at least two fixed slide rod assemblies 6 are also included. The at least two fixed slide rod assemblies 6 are evenly distributed along the circumference of the mounting assembly. The fixed slide rod assembly 6 includes a fixed slide rod 61. One end of the fixed slide rod 61 is fixedly connected to the top flange 41 by a fixed nut (fixed nut pair 62 includes two fixed nut units 621). The two fixed nut units 621 are respectively located on the upper and lower sides of the top flange 41. The other end of the fixed slide rod 61 is fixedly connected to the bottom flange 52 by a fixed nut pair 62. The two fixed nut units 621 are respectively located on the upper and lower sides of the bottom flange 52. The fixed slide rod 61 is slidably connected to the guide sleeve 63 on the intermediate flange. The guide sleeve 63 is fixed to the intermediate flange by a guide pin 631.

[0024] In some specific embodiments, at least two movable slide rod assemblies 7 are further included. These assemblies are evenly distributed circumferentially along the mounting assembly. Each movable slide rod assembly 7 includes a movable slide rod 71. One end of the movable slide rod 71 is fixedly connected to the lifting flange 11 of the connecting assembly 1 via a movable nut pair 72 (the movable nut pair 72 includes two movable nut units 721). The two movable nut units 721 are located on the upper and lower sides of the lifting flange 11, respectively. The other end of the movable slide rod 71 is fixedly connected to the intermediate flange via the movable nut pair 72. The two movable nut units 721 are located on the upper and lower sides of the intermediate flange, respectively, thus fixing the lifting flange 11 and the intermediate flange relatively. The movable slide rod 71 is slidably connected to the top flange 41, passing through a through hole in the top flange 41, with sufficient clearance maintained between the movable slide rod 71 and the hole wall. The lifting and lowering of the connecting assembly 1 causes the intermediate concave flange 42 and the intermediate flat flange 51 to slide against the outer wall of the fixed slide rod 61, thereby changing the size of the first test space 4 and the second test space 5.

[0025] In some specific embodiments, the movable slide rod assembly 7 and the fixed slide rod assembly 6 are arranged alternately along the circumference of the mounting assembly, and there is a gap in the circumference between the movable slide rod 71 and the adjacent fixed slide rod 61.

[0026] In some specific embodiments, the intermediate flange includes an intermediate concave flange 42 and an intermediate convex flange. The fixed slide rod 61 passes through the top flange 41, the intermediate concave flange 42, the intermediate flat flange 51 and the bottom flange 52 from top to bottom. The movable slide rod 71 passes through the lifting flange 11, the top flange 41, the intermediate concave flange 42 and the intermediate flat flange 51 from top to bottom. The intermediate concave flange 42 and the intermediate convex flange are locked by the movable nut on the movable slide rod 71. The intermediate concave flange 42 and the intermediate convex flange form a groove for limiting the limiting protrusion of the torsion sleeve 31. During installation, the limiting protrusion of the torsion sleeve 31 is first placed on the intermediate convex flange, and then the intermediate concave flange 42 is closed, so that the limiting protrusion of the torsion sleeve 31 is located in the groove formed by the intermediate concave flange 42 and the intermediate convex flange, thereby realizing the relative rotation of the torsion sleeve 31 and the intermediate flange.

[0027] In some specific embodiments, at least two torsion frames are evenly distributed circumferentially along the torsion sleeve 31. The torsion frames are located between the fixed slide rod 61 and the movable slide rod 71. Each torsion frame includes a connecting rod 33 and two torsion rods 32, symmetrically arranged about the intermediate flange. One end of each torsion rod 32 is threadedly connected to the torsion sleeve 31, and the other end is fixedly connected to the connecting rod 33. A torsion chuck 34 is mounted on the connecting rod 33. The torsion chuck 34 is equipped with a torsion sensor and an angular displacement sensor. The torsion sensor monitors the torque of the torsion sleeve 31 and can be used to display the torque. The angular displacement sensor monitors the angular displacement of the torsion chuck 34.

[0028] In some specific embodiments, the first bellows assembly 400 and the second bellows assembly 500 are coaxially arranged. The first upper flange 4001 at the upper end of the first bellows assembly 400 is detachably connected to the bottom end face of the top flange 41, and the first lower flange 4002 at the lower end of the first bellows assembly 400 is detachably connected to the top end face of the limiting step on the torsion sleeve 31. The second upper flange 5001 at the upper end of the second bellows assembly 500 is detachably connected to the bottom end face of the limiting step on the torsion sleeve 31, and the second lower flange at the lower end of the second bellows assembly 500 is detachably connected to the top end face of the bottom flange 52. Specifically, the first upper flange 4001 at the upper end of the first bellows assembly 400 and the bottom end face of the top flange 41, and the second lower flange at the lower end of the second bellows assembly 500 and the top end face of the bottom flange 52 are all connected by several first mounting components, the first mounting components being locking screws 4003; the first lower flange 4002 at the lower end of the first bellows assembly 400 and the top end face of the limiting step on the torsion sleeve 31, and the second upper flange 5001 at the upper end of the second bellows assembly 500 and the bottom end face of the limiting step on the torsion sleeve 31 are all connected by several second mounting components, the second mounting components including locking studs 311 and locking nuts 312, the two ends of the locking studs 311 having external threads, and the locking nuts 312 being connected to the locking studs 311 at the positions where the external threads are provided.

[0029] In some specific embodiments, a support assembly 2 is also included. The support assembly 2 includes a transition flange 21 and support columns 22. The transition flange 21 is located below the bottom flange 52, and the support columns 22 are located between the bottom flange 52 and the transition flange 21. Multiple support columns 22 are evenly distributed along the circumference of the transition flange 21, and the design gap between the transition flange 21 and the bottom flange 52 is controlled by the support columns 22. Threaded holes are provided at both ends of the support columns 22. Columnar stepped mounting holes 212 are provided at corresponding positions on the bottom flange 52 and the transition flange 21. Mounting pins 221 pass through the mounting holes 212 from the bottom of the transition flange 21 and are connected to the threaded holes at the lower end of the support columns 22. Multiple fixing holes 211 are provided on the transition flange 21. The bottom surface of the transition flange 21 is flat, which can adapt to different machine table surfaces and facilitates installation.

[0030] In some specific embodiments, device holes 411 are provided on both the top flange 41 and the bottom flange 52. The device holes 411 are used to install air pipe connectors 412 and plugs 413. Air pipe connectors 412 and plugs 413 are provided on the first upper flange 4001 of the first bellows assembly 400 and the second lower flange of the second bellows assembly 500. High pressure can be charged into the first bellows assembly 400 and / or the second bellows assembly 500 through the air pipe connectors 412.

[0031] The specific working process in this embodiment is as follows: The testing device is installed on the workbench. The tension / compression chuck 13 clamps the clamping rod 12. The tension / compression chuck 13 is connected to the tension / compression sensor and can move up and down. The torsion chuck 34 clamps the connecting rod 33, and the torsion sleeve 31 is rotated through the torsion rod 32, allowing for forward and reverse rotation in the circumferential direction. The lifting flange 11 and the intermediate flat flange 51 are kept relatively fixed by a moving screw, which passes through the top flange 41. The top flange 41 and the bottom flange 52 are kept relatively fixed by a fixed screw, which passes through the intermediate concave flange 42 and the intermediate flat flange 51, ensuring the overall stability of the device.

[0032] Air pressure is introduced into the first bellows assembly 400 and the second bellows assembly 500 through the air pipe connector 412 until the required pressure is reached, at which point the pressurization stops. When the first bellows assembly 400 and the second bellows assembly 500 are pressurized, they generate a large axial force. However, because they are fixedly connected by the intermediate concave flange 42 and the intermediate flat flange 51, they can move up and down via the fixed sliding rod assembly 6 to achieve force balance, ensuring sufficient strength of the testing device.

[0033] When the clamping rod 12 moves up and down, the intermediate flange moves up and down accordingly. The positions of the top flange 41 and the bottom flange 52 remain unchanged; therefore, the distances between the intermediate flange and the top flange 41, and between the intermediate flange and the bottom flange 52, are negatively correlated. When the first bellows assembly 400 is compressed, the second bellows assembly 500 is stretched; when the first bellows assembly 400 is stretched, the second bellows assembly 500 is compressed. This enables the simultaneous testing of the axial tensile and compressive properties of a group of bellows assemblies.

[0034] When the torsion sleeve 31 rotates in both directions circumferentially, the first bellows assembly 400 and the second bellows assembly 500 rotate accordingly. Since the top flange 41, the intermediate concave flange 42, the intermediate flat flange 51, and the bottom flange 52 are fixed, the first upper flange 4001 and the second lower flange are also fixed, while the first lower flange 4002 and the second upper flange 5001 can rotate with the torsion sleeve 31. This allows for the simultaneous testing of the axial torsional performance of the grouped bellows assemblies.

[0035] When measuring tensile and compressive fatigue life and torsional fatigue life, the fatigue life of two bellows assemblies can be detected simultaneously by continuously moving the clamping rod up and down for 12 cycles or by continuously reciprocating the torsion sleeve for 31 cycles, which greatly reduces the test time.

[0036] This embodiment can simultaneously measure the performance of a set of special bellows assemblies (i.e., the first bellows assembly 400 and the second bellows assembly 500), mainly testing the axial tensile and compressive performance and circumferential torsional performance of the high-internal-pressure bellows assembly. Since the special bellows assembly generates enormous axial forces on the upper and lower flanges after being pressurized, traditional performance testing devices would require extremely bulky designs to ensure strength. In contrast, this embodiment arranges the first bellows assembly 400 and the second bellows assembly 500 symmetrically, sharing a common intermediate flange, allowing the axial forces of the two bellows assemblies to reach a balanced state. This design reduces costs while maintaining the strength of the testing device.

[0037] Furthermore, this embodiment utilizes a vertically positioned arrangement of two bellows assemblies (i.e., the first bellows assembly 400 and the second bellows assembly 500) to simultaneously test the axial and circumferential properties of both bellows assemblies, thus saving significant space and time. The top flange 41 and bottom flange 52 maintain a constant relative distance. By adjusting the connecting assembly 1 with the connected intermediate flange, the sizes of the first test space 4 and the second test space 5 are altered. During testing, the tensile or compressive properties of the first bellows assembly 400 can be simultaneously tested, allowing for the simultaneous testing of the compressive or tensile properties of the second bellows assembly 500. Simultaneously with the tensile and compressive performance testing, a torsion mechanism 3 can be used. The torsion clamp 34 clamps the connecting rod 33, driving the torsion rod 32 to rotate the torsion sleeve 31, thereby causing the first bellows assembly 400 and the second bellows assembly 500 to rotate circumferentially, testing their torsional properties. This grouped multi-degree-of-freedom testing significantly reduces testing time, improves testing efficiency, and fully assesses the performance of the bellows assemblies. This embodiment tests a group of bellows assemblies. After the bellows assemblies are pressurized, one of them may be compressed and the other stretched. When the tension and compression clamps are kept stationary, axial compensation can be achieved, which can improve the test accuracy of tension and compression stiffness.

[0038] Example 2 Traditional testing methods can only measure axial stiffness. However, during bellows testing, especially with special bellows, when the bellows assembly is under high pressure, a certain degree of circumferential torsion occurs during axial tension and compression. Furthermore, simple torsional measurements of the bellows assembly also produce axial displacement changes. These coupled variations cannot be detected by traditional testing methods. (Axial force) F Circumferential torque M Axial tensile and compressive displacement d Angular displacement of circumferential torsion i Stiffness matrix of bellows assembly K The relationship between them is: .

[0039] This embodiment provides a method for testing the coupling stiffness of a grouped bellows assembly using the coupling performance testing device of Embodiment 1, including: The coupling performance testing device for assembled bellows assemblies, the specific process is as follows: S1. Connect the bottom flange 52, transition flange 21, and support column 22; S2. Fix the second bellows assembly 500 onto the bottom flange 52, install the torsion sleeve 31, the intermediate flat flange 51, and the intermediate concave flange 42 to form the second test space 5, and install the guide sleeve 63. S3. Fix the first bellows assembly 400 on the middle concave flange 42, install the top flange 41 above the first bellows assembly 400 to form the first test space 4, and pass the set slide rod 61 through it. S4. Insert the movable slide bar 71, install the lifting flange 11 and clamping rod 12 to form the connecting assembly 1; S5. Fix the tension / compression chuck 13 onto the clamping rod 12 and connect the tension / compression sensor; fix the torsion chuck 34 onto the connecting rod 33 and connect the torsion sensor. Inflate the first bellows assembly 400 and the second bellows assembly 500 with air to bring the air pressure inside the first bellows assembly 400 and the second bellows assembly 500 to the specified requirements. The torsion chuck 34 and the tension / compression chuck 13 are kept stationary by external force, and the force value is read by the tension / compression sensor. F 0+ The torque value read by the torsion sensor M 01 ; Continue to keep the torsion chuck 34 stationary: drive the intermediate flange to move through the tension chuck 13, so that the first bellows assembly 400 is in a compressed state and the second bellows assembly 500 is in a stretched state; The movement distance of the tension / compression chuck 13 is read by a displacement sensor, and the movement distance of the tension / compression chuck 13 is recorded as follows: d + Force values ​​are read by tension and compression sensors. The torque value read by the torsion sensor M t1 The axial tensile and compressive stiffness value at this time Circumferential torsional coupling stiffness value k t1 for: , ; The tension / compression chuck 13 returns to its original position. External force is used to keep the torsion chuck 34 and tension / compression chuck 13 stationary, and the force value is read by the tension / compression sensor. F0- The torque value read by the torsion sensor M 02 ; Continue to keep the torsion chuck 34 stationary: drive the intermediate flange to move through the tension chuck 13, so that the first bellows assembly 400 is in a stretched state and the second bellows assembly 500 is in a compressed state; The movement distance of the tension / compression chuck 13 is read by a displacement sensor, and the movement distance of the tension / compression chuck 13 is recorded as follows: d - Force values ​​are read by tension and compression sensors. The torque value read by the torsion sensor M t2 The axial tensile and compressive stiffness value at this time Circumferential torsional coupling stiffness value k t2 for: , ; This allows us to obtain the axial stiffness of the first bellows assembly 400 and the second bellows assembly 500 when constrained in the circumferential torsional degree of freedom. k 11 Circumferential torsional coupling stiffness of the first bellows assembly 400 and the second bellows assembly 500 k 21 for: , ; The torsion chuck 34 and the tension / compression chuck 13 are kept stationary by external force, and the force value is read by the tension / compression sensor. F 0 The torque value read by the torsion sensor M 0 ; Continue to keep the tension and compression chuck 13 stationary, and keep the size of the first test space 4 and the second test space 5 constant: drive the torsion sleeve 31 to move by the torsion chuck 34, so that the first bellows assembly 400 and the second bellows assembly 500 are in a torsion state. The angular displacement of the torsion chuck 34 is read by an angular displacement sensor, and the angular displacement of the torsion chuck 34 is recorded as follows: i 0 (Unit: rad) Force values ​​are read using tension / compression sensors. The torque value read by the torsion sensor M t The circumferential torsional stiffness value at this time k 22 and axial tension-compression coupling stiffness value k12 for: , ; The stiffness matrix K of the first bellows assembly 400 and the second bellows assembly 500 is obtained as follows: .

[0040] k 11 To achieve fully constrained circumferential torsion ( i The axial force required to produce a unit axial displacement under the condition that = 0); k 22 To achieve fully constrained axial tension and compression ( d The torque required to produce a unit torsional angle under the condition that =0); k 12 To constrain axial tension and compression ( d When =0), the axial force required to generate a unit torsional angle; k 21 To constrain circumferential torsion ( i When =0), the torque required to produce a unit axial displacement.

[0041] In some specific embodiments, the shaft torsional coupling coefficient or for: The axial-torsional coupling coefficient indicates the strength of the interaction between the axial tension / compression and the circumferential torsion of the bellows assembly. or The closer it is to 0, the weaker the coupling between axial tension / compression stiffness and circumferential torsional coupling stiffness during axial tension / compression, and the weaker the coupling between circumferential torsional stiffness and axial tension / compression coupling stiffness during circumferential torsion. or The larger the value, the stronger the coupling between the axial tensile / compressive stiffness and the circumferential torsional coupling stiffness during axial tension / compression, and the stronger the coupling between the circumferential torsional stiffness and the axial tensile / compressive coupling stiffness during circumferential torsion.

[0042] In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] If this invention discloses or relates to components or structural parts that are fixedly connected to each other, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws) or a non-detachable fixed connection (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0045] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0046] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0047] It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are only used to complement the content disclosed in the specification, so as to enable those skilled in the art to understand and read them, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0048] It should also be noted that in the embodiments of this application, the same reference numerals are used to denote the same component or the same part.

[0049] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0050] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A device for testing the coupling performance of a group of bellows assemblies, characterized in that: include: Connection components, mounting components, and torsion mechanism; The connecting component is used to connect with the tension / compression clamp; The mounting assembly includes a top flange, an intermediate flange, and a bottom flange. A first test space for placing a first bellows assembly is formed between the top flange and the intermediate flange. A second test space for placing a second bellows assembly is formed between the intermediate flange and the bottom flange. The connecting assembly can drive the intermediate flange to move. The movement of the connecting assembly drives the intermediate flange to move between the top flange and the bottom flange, thereby changing the size of the first test space and the second test space. The torsion mechanism includes a torsion sleeve, which is connected to the first bellows assembly and the second bellows assembly respectively. The torsion sleeve rotates relative to the intermediate flange and is used to connect with a torsion clamp.

2. The coupling performance testing device for grouped bellows assemblies according to claim 1, characterized in that: The intermediate flange includes an intermediate concave flange and an intermediate convex flange, which are fixedly connected and form a groove for restricting the torsion sleeve.

3. The coupling performance testing device for grouped bellows assemblies according to claim 2, characterized in that: It also includes at least two fixed slide rod assemblies, which are evenly distributed around the circumference of the mounting assembly. Each fixed slide rod assembly includes a fixed slide rod, one end of which is fixedly connected to the top flange, the other end of which is fixedly connected to the bottom flange, and the fixed slide rod is slidably connected to the intermediate flange.

4. The coupling performance testing device for grouped bellows assemblies according to claim 3, characterized in that: It also includes at least two movable slide rod assemblies, which are evenly distributed around the circumference of the mounting assembly. Each movable slide rod assembly includes a movable slide rod, one end of which is fixedly connected to the connecting assembly, the other end of which is fixedly connected to the intermediate flange, and the movable slide rod is slidably connected to the top flange.

5. The coupling performance testing device for grouped bellows assemblies according to claim 4, characterized in that: The movable slide bar assembly and the fixed slide bar assembly are arranged alternately along the circumference of the mounting assembly.

6. The coupling performance testing device for grouped bellows assemblies according to claim 1, characterized in that: The first bellows assembly and the second bellows assembly are coaxially arranged, and both the first bellows assembly and the second bellows assembly are provided with a gas pipe connector for introducing gas.

7. The coupling performance testing device for grouped bellows assemblies according to claim 1, characterized in that: It also includes a support assembly, to which the bottom flange is connected.

8. The coupling performance testing device for grouped bellows assemblies according to claim 1, characterized in that: It also includes a torsion frame, which is fixedly connected to the torsion sleeve, and the torsion chuck is disposed on the torsion frame.

9. A method for testing the coupling stiffness of a grouped bellows assembly using the coupling performance testing device of any one of claims 1-8, characterized in that: include: A device for testing the coupling performance of assembled bellows assemblies; Inflate the first and second bellows assemblies with air to bring the air pressure inside them up to the required level. Keep the torsion chuck and tension / compression chuck stationary, and monitor the axial force value of the tension / compression chuck. F 0+ Monitor the torque value of the torsion chuck. M 01 ; Continue to keep the torsion chuck stationary: drive the intermediate flange to move by pulling and pressing the chuck, so that the first bellows assembly is in a compressed state and the second bellows assembly is in a stretched state; The distance traveled by the tension / compression chuck is denoted as... δ + Monitor the axial force value of the tension / compression chuck. Monitor the torque value of the torsion chuck. M t1 The axial tensile and compressive stiffness value at this time Circumferential torsional coupling stiffness value k t1 for: ， ； The tension / compression chuck returns to its original position, while the torsion chuck and tension / compression chuck remain stationary. The axial force value of the tension / compression chuck is monitored. F 0- Monitor the torque value of the torsion chuck. M 02 ; Continue to keep the torsion chuck stationary: drive the intermediate flange to move through the tension chuck, so that the first bellows assembly is in a stretched state and the second bellows assembly is in a compressed state; The distance traveled by the tension / compression chuck is denoted as... δ - Monitor the axial force value of the tension / compression chuck. Monitor the torque value of the torsion chuck. M t2 The axial tensile and compressive stiffness value at this time Circumferential torsional coupling stiffness value k t2 for: ， ； This leads to the axial stiffness of the first and second bellows assemblies when constrained in the circumferential torsional degree of freedom. k 11 Circumferential torsional coupling stiffness of the first and second bellows assemblies k 21 for: ， ； Keep the torsion chuck and tension / compression chuck stationary, and monitor the axial force value of the tension / compression chuck. F 0 Monitor the torque value of the torsion chuck. M 0 ; Continue to keep the tension and compression chuck stationary: drive the torsion sleeve to move by twisting the chuck, so that the first bellows assembly and the second bellows assembly are in a torsion state; The angular displacement of the torsion chuck is denoted as θ 0 Monitor the axial force value of the tension / compression chuck. Monitor the torque value of the torsion chuck. M t The circumferential torsional stiffness value at this time k 22 and axial tension-compression coupling stiffness value k 12 for: ， ； The stiffness matrices of the first and second bellows assemblies are obtained. K for: 。 10. The coupling stiffness testing method according to claim 9, characterized in that: Shaft torsional coupling coefficient η for: η The closer it is to 0, the weaker the coupling between axial tension / compression stiffness and circumferential torsional coupling stiffness during axial tension / compression, and the weaker the coupling between circumferential torsional stiffness and axial tension / compression coupling stiffness during circumferential torsion. η The larger the value, the stronger the coupling between the axial tensile / compressive stiffness and the circumferential torsional coupling stiffness during axial tension / compression, and the stronger the coupling between the circumferential torsional stiffness and the axial tensile / compressive coupling stiffness during circumferential torsion.

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