Air spring torsional fatigue test device

Abstract

An air spring torsional pendulum fatigue test device includes a horizontally arranged mounting platform and a vertical loading assembly for applying a vertical load to the air spring. The vertical loading assembly is mounted on the mounting platform and is characterized in that: a torsional pendulum loading mechanism having three moving layers, upper, middle, and lower, is mounted on the mounting platform. The air spring is vertically mounted between the torsional pendulum loading mechanism and the vertical loading assembly. The horizontal longitudinal movement of the lower layer in the torsional pendulum loading mechanism, the horizontal lateral movement of the middle layer on the lower layer, and the torsion of the upper layer on the middle layer combine to form a torsional pendulum motion that drives the air spring to oscillate. During the movement of the torsional pendulum loading mechanism, the upper, middle, and lower moving layers all have relative unidirectional motion. The torsional pendulum motion is composed of multiple layers of motion, achieving torsional pendulum loading of the air spring, simulating the load of the air spring in actual torsional pendulum working conditions, and improving the reliability and effectiveness of the air spring torsional pendulum fatigue test.

Description

Technical Field

[0001] The invention relates to an air spring torsional pendulum fatigue testing device, belonging to the technical field of air spring detection. Background Art

[0002] Air springs, as key components of EMU bogies, play a vital role in improving vehicle comfort and safety. When traversing curved tracks, air springs withstand not only static loads from the vertical vehicle body but also horizontal and torsional displacements. Existing two-dimensional air spring loading and torsional stiffness testing machines can only perform pure shear and torsional stiffness tests on air springs. Mechanical air pendulum fatigue testing machines, which use an eccentric wheel to apply a fixed displacement, not only lack fatigue life but also frequently require replacement of wearing parts due to mechanical wear, making it impossible to collect load and displacement test data. Air spring mechanical properties are divided into static and fatigue tests. Static performance includes air tightness, vertical, shear, torsion, and pendulum tests, while fatigue performance includes vertical, shear, and pendulum fatigue tests. Most conventional mechanical performance tests are already available. Shear testing measures the shear stiffness of an air spring at different horizontal displacements, torsion testing measures the torsional stiffness of an air spring at different torsional angles, and pendulum testing measures the combined torsional and pendulum loading performance of an air spring at different horizontal and torsional displacements. In summary, there are still considerable technical difficulties in conducting torsional fatigue tests on air springs using current technology. Summary of the Invention

[0003] The air spring torsional pendulum fatigue test device provided by the present invention has an upper, middle and lower motion layer that all have relative unidirectional motion during the movement of the torsional pendulum loading mechanism. The torsional pendulum motion is composed of multiple layers of motion, thereby realizing torsional pendulum loading of the air spring, simulating the load-bearing of the air spring in actual torsional pendulum working conditions, and improving the reliability and effectiveness of the air spring torsional pendulum fatigue test.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] An air spring torsion pendulum fatigue test device includes a horizontally arranged installation platform and a vertical loading component for applying a vertical load to the air spring. The vertical loading component is mounted on the installation platform and is characterized in that a torsion pendulum loading mechanism with three moving layers, namely, upper, middle and lower layers, is installed on the installation platform. The air spring is vertically installed between the torsion pendulum loading mechanism and the vertical loading component. The horizontal longitudinal movement of the lower layer in the torsion pendulum loading mechanism, the horizontal lateral movement of the middle layer on the lower layer, and the torsion of the upper layer on the middle layer are combined into a torsion pendulum motion to drive the air spring to torsion.

[0006] Preferably, the torsion pendulum loading mechanism includes a lower longitudinal sliding plate that can move horizontally longitudinally on the mounting platform, a middle lateral power assembly mounted on the lower longitudinal sliding plate and having horizontal lateral loading power, and an upper torsion assembly rotatably mounted on the middle lateral power assembly. The upper torsion assembly is connected to the mounting platform to form a swing fulcrum, and the upper torsion assembly is connected to the lower end plate of the air spring. The lower longitudinal sliding plate slides on the mounting platform as the middle lateral power assembly moves, causing the upper torsion assembly to swing and generate torsion.

[0007] Preferably, the lower longitudinal sliding plate cooperates with the mounting platform along the horizontal longitudinal guide, the middle transverse power assembly cooperates with the lower longitudinal sliding plate along the horizontal transverse guide, and forms a rolling friction pair with the lower longitudinal sliding plate.

[0008] Preferably, the middle-layer transverse power assembly includes a middle-layer transverse sliding plate that forms a rolling friction pair with the lower-layer longitudinal sliding plate, a transverse oil cylinder that pushes the middle-layer transverse sliding plate to move back and forth, and a cylinder support installed on the mounting platform. The transverse oil cylinder is arranged horizontally and laterally, and the telescopic end is hinged to the middle-layer transverse sliding plate by a rotating ball head, and the mounting end is installed on the cylinder support.

[0009] Preferably, the top surface of the lower longitudinal sliding plate is provided with a roller mounting frame, in which rollers evenly arranged horizontally are mounted, and a rolling friction pair is formed between the rollers and the middle transverse sliding plate.

[0010] Preferably, the lower longitudinal sliding plate is equipped with guide rollers for guiding the middle transverse sliding plate. The guide rollers are arranged on both sides of the roller mounting frame and are evenly arranged along the horizontal direction. Both sides of the middle transverse sliding plate are in rolling contact with the guide rollers respectively.

[0011] Preferably, the installation platform is equipped with longitudinal guide rails along the horizontal longitudinal direction. There are multiple longitudinal guide rails and they are laid in parallel on the installation platform. The bottom of the lower longitudinal sliding plate has a guide block that cooperates with the longitudinal guide rail. The cross-section of the longitudinal guide rail is waisted in shape, and the guide block is vertically positioned on the longitudinal guide rail.

[0012] Preferably, the upper torsion assembly includes a thrust bearing mounted on the middle-layer lateral power assembly and a swing arm mounting platform equipped with the thrust bearing. The lower end plate of the air spring extends into the swing arm mounting platform and is connected to the thrust bearing. A swing radius adjustment assembly for adjusting the swing radius of the upper torsion assembly is installed on the mounting platform. The swing arm mounting platform and the swing radius adjustment assembly are hinged to form a swing fulcrum.

[0013] Preferably, the swing arm mounting platform includes a mounting platform equipped with a thrust bearing and a swing arm extending horizontally from the mounting platform. The swing radius adjustment assembly includes a support seat mounted on the mounting platform and coordinated with the longitudinal guide rail, a support column mounted on the support seat and vertically arranged, and a screw pusher mounted on the mounting platform and pushing the support seat to move along the longitudinal guide rail. The upper end of the support column is hinged to the swing arm to form a swing fulcrum. The swing arm is provided with a strip hole parallel to the longitudinal guide rail. The support column is provided with an upper positioning bolt extending from the strip hole. The bottom of the support seat is provided with a lower positioning bolt for positioning the support seat on the longitudinal guide rail. The swing radius of the mounting platform is determined by the locking of the upper positioning bolt and the lower positioning bolt.

[0014] Preferably, the vertical loading assembly includes a vertical guide column vertically mounted on the mounting platform, a loading plate guided by the vertical guide column, a top plate mounted above the loading plate and fixed to the vertical guide column, a loading force transmission plate mounted on the bottom of the loading plate, and a vertical loading motor mounted on the top plate and connected to the loading plate, and the upper cover plate of the air spring is connected to the loading force transmission plate.

[0015] The beneficial effects of the invention are:

[0016] The air spring torsional fatigue test device of the present invention is that the air spring is installed between the torsional loading mechanism and the vertical loading component, and the torsional loading mechanism is configured to have three motion layers: upper, middle and lower. That is, the torsional motion of the torsional loading mechanism is decomposed into the horizontal longitudinal motion of the lower layer, the horizontal lateral motion of the middle layer on the lower layer, and the torsion of the upper layer on the middle layer. The motions of the upper layer and the middle layer are combined into horizontal swing, and the torsion of the upper layer on the middle layer is combined with the horizontal swing to form a torsional motion, which solves the technical problem of the difficulty of combining horizontal swing and horizontal torsion in the existing air spring testing equipment, realizes torsional loading of the air spring, and simulates The load-bearing of the simulated air spring in the actual torsional pendulum working condition is improved, and the reliability and effectiveness of the torsional pendulum fatigue test of the air spring are improved. During the movement of the torsional pendulum loading mechanism, the upper, middle and lower motion layers all have relative unidirectional motion. The torsional pendulum motion is composed of multiple layers of motion. Each layer only bears the force of its unidirectional motion, which generates smaller friction and higher displacement accuracy. It realizes torsional pendulum loading of small radius and small angle of the air spring, improves the test accuracy, and solves the technical problem of existing air spring loading test equipment that combines multi-directional motion in one motion layer, resulting in unstable friction in the general direction and low displacement accuracy.

[0017] The torsion pendulum loading mechanism includes a lower longitudinal sliding plate, a middle lateral power assembly and an upper torsion assembly. The upper torsion assembly is connected to the mounting platform to form a swing fulcrum. The middle lateral power assembly has a horizontal lateral loading power, which causes the middle lateral power assembly to form a horizontal lateral reciprocating motion on the lower longitudinal sliding plate. Due to the constraint of the swing fulcrum, the middle lateral power assembly will drive the upper torsion assembly to swing around the swing fulcrum, so that the lower longitudinal sliding plate slides back and forth horizontally in the longitudinal direction on the mounting platform, forming a swinging horizontal longitudinal displacement, thereby decomposing the horizontal swing into the longitudinal motion of the lower layer and the lateral motion of the middle layer. The upper torsion assembly generates torsion during the swinging process, thereby realizing a composite motion of swinging and torsion, adapting to the torsion of the air spring during the swinging process, and adjusting the swing radius of the upper torsion assembly and the lateral loading displacement of the middle lateral power assembly to adjust the swing angle, torsion angle and swing radius of the torsion pendulum loading mechanism, thereby realizing a torsion fatigue test of the air spring under simulated different torsion working conditions. Even when the swing radius and the swing angle are small, the torsion pendulum loading mechanism will form an effective motion, and the test will be more accurate and more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of an air spring torsional pendulum fatigue test device in a specific embodiment.

[0019] Figure 2 It is a side view of the air spring torsional fatigue test device.

[0020] Figure 3 for Figure 2 A partial enlarged view of .

[0021] Figure 4 This is the other side view of the air spring torsional fatigue test device (omitting the vertical loading component). DETAILED DESCRIPTION

[0022] The following combination Figures 1 to 4 The embodiments of the present invention are described in detail.

[0023] The air spring torsion pendulum fatigue test device includes a horizontally arranged installation platform 1 and a vertical loading component 2 for applying a vertical load to the air spring. The vertical loading component 2 is mounted on the installation platform 1 and is characterized in that a torsion pendulum loading mechanism 3 with three moving layers, namely, upper, middle and lower layers, is installed on the installation platform 1. The air spring 100 is vertically installed between the torsion pendulum loading mechanism 3 and the vertical loading component 2. The horizontal longitudinal movement of the lower layer in the torsion pendulum loading mechanism, the horizontal lateral movement of the middle layer on the lower layer, and the torsion of the upper layer on the middle layer are combined into a torsion pendulum motion to drive the air spring to torsion.

[0024] In the above-mentioned air spring torsion fatigue test device, the air spring 100 is installed between the torsion loading mechanism 3 and the vertical loading component 2, and the torsion loading mechanism 3 is set to have three motion layers: upper, middle and lower. That is, the torsion motion of the torsion loading mechanism 3 is decomposed into the horizontal longitudinal motion of the lower layer, the horizontal lateral motion of the middle layer on the lower layer, and the torsion of the upper layer on the middle layer. The motion of the upper layer and the middle layer is combined into horizontal swing, and the torsion of the upper layer on the middle layer is combined with the horizontal swing to form a torsion motion, which solves the technical problem of the difficulty of combining horizontal swing and horizontal torsion in the existing air spring test equipment, and realizes the torsion of the air spring. Loading simulates the load of the air spring in actual torsional pendulum working conditions, improves the reliability and effectiveness of the air spring torsional pendulum fatigue test, and during the movement of the torsional pendulum loading mechanism 3, the upper, middle and lower three motion layers all have relative unidirectional motion. The torsional pendulum motion is composed of multiple layers of motion. Each layer only bears the force of its unidirectional motion, which generates smaller friction and higher displacement accuracy. It realizes torsional pendulum loading of small radius and small angle of the air spring, improves the test accuracy, and solves the technical problem that the existing air spring loading test equipment combines multi-directional motion in one motion layer, the friction generated is not constant in the general direction, and the displacement accuracy is low.

[0025] Among them, the torsion pendulum loading mechanism 3 includes a lower longitudinal sliding plate 4 that can move horizontally longitudinally on the installation platform 1, a middle lateral power component 5 installed on the lower longitudinal sliding plate 4 and having horizontal lateral loading power, and an upper torsion component 6 rotatably installed on the middle lateral power component 5. The upper torsion component 6 is connected to the installation platform 1 to form a swing fulcrum, and the upper torsion component 6 is connected to the lower end plate of the air spring 100. The lower longitudinal sliding plate 4 slides on the installation platform with the movement of the middle lateral power component 5, causing the upper torsion component 6 to swing and generate torsion. The middle-layer lateral power component 5 has horizontal lateral loading power, so that the middle-layer lateral power component 5 forms a horizontal lateral reciprocating motion on the lower-layer longitudinal sliding plate 4. Due to the constraint of the swing fulcrum, the middle-layer lateral power component 5 can only drive the upper-layer torsion component 6 to swing around the swing fulcrum, so that the lower-layer longitudinal sliding plate 4 slides back and forth horizontally and longitudinally on the mounting platform 1, forming a swinging horizontal longitudinal displacement, realizing the decomposition of the horizontal swing into the longitudinal motion of the lower layer and the lateral motion of the middle layer. The upper-layer torsion component 6 generates torsion during the swinging process, realizing a composite motion of swinging and torsion, adapting to the torsion of the air spring 100 during the swinging process, adjusting the swing radius of the upper torsion component 6 and the lateral loading displacement of the middle-layer lateral power component 5, and adjusting the swing angle, torsion angle and swing radius of the torsion loading mechanism 3, to realize the simulation of the air spring torsion fatigue test under different torsion working conditions. Even when the swing radius and the swing angle are small, the torsion loading mechanism will form an effective motion, and the test will be more accurate and more practical.

[0026] The lower longitudinal sliding plate 4 is guided along the horizontal longitudinal direction by the mounting platform 1, and the middle transverse power assembly 5 is guided along the horizontal transverse direction by the lower longitudinal sliding plate 4, forming a rolling friction pair with the lower longitudinal sliding plate 4. The horizontal longitudinal direction refers to the left-right direction in the drawings, and the horizontal transverse direction refers to the front-back direction in the drawings. The lower longitudinal sliding plate 4 is constrained by the mounting platform 1 to move only in the horizontal longitudinal direction, while the middle transverse power assembly 5 is constrained by the lower longitudinal sliding plate 4 to move only in the horizontal transverse direction on the lower longitudinal sliding plate 4. The swinging of the upper torsion assembly 6 about the swing fulcrum is decomposed into the horizontal longitudinal motion of the lower longitudinal sliding plate 4 on the mounting platform 1 and the horizontal transverse motion of the middle transverse motion assembly 5 on the upper longitudinal sliding plate 4. The lower longitudinal sliding plate 4 only bears the horizontal longitudinal force, while the middle transverse power assembly 5 only applies the horizontal transverse loading force. During the movement, the horizontal transverse direction is the direct force application direction. The middle transverse power assembly 5 has a large horizontal transverse displacement, while the lower longitudinal sliding plate 4 has a smaller horizontal longitudinal displacement due to the swinging of the upper torsion assembly 6. When the swing radius is small and the angle is small, the horizontal longitudinal movement displacement is small, but the unidirectional movement of the lower longitudinal slide 4 on the mounting platform 1 is not restricted by the small displacement. The lower longitudinal slide 4 can also slide precisely under small radius and small angle conditions. The movement accuracy of the torsion pendulum loading mechanism 3 is high and is not restricted by the swing angle and swing radius.

[0027] Among them, the middle-layer transverse power assembly 5 includes a middle-layer transverse sliding plate 51 that forms a rolling friction pair with the lower-layer longitudinal sliding plate 4, a transverse oil cylinder 52 that pushes the middle-layer transverse sliding plate 51 to reciprocate, and a cylinder support 53 installed on the mounting platform 1. The transverse oil cylinder 52 is arranged horizontally and the telescopic end is hinged to the middle-layer transverse sliding plate 51 through a rotating ball head, and the mounting end is installed on the cylinder support 53. The transverse cylinder 52 applies a transverse force to the middle transverse sliding plate 51, causing the middle transverse sliding plate 51 to reciprocate on the lower longitudinal sliding plate 4. Since the lower longitudinal sliding plate 4 will move horizontally and longitudinally, the telescopic end of the transverse cylinder 52 is connected to the middle transverse sliding plate 51 through a rotating ball head. When the middle transverse sliding plate 51 moves longitudinally with the lower longitudinal sliding plate 4, the rotating ball head rotates synchronously, so that the transverse cylinder 52 applies a transverse force to the middle transverse sliding plate 51 during the process of the middle transverse sliding plate 51 moving longitudinally with the lower longitudinal sliding plate 4, driving the middle transverse sliding plate 51 to move horizontally and transversely on the lower longitudinal sliding plate 4. The movement of the upper longitudinal sliding plate 4 and the middle transverse sliding plate 51 are combined, causing the middle transverse sliding plate 51 to swing around the swing fulcrum.

[0028] The top surface of the lower longitudinal sliding plate 4 is equipped with a roller mounting frame 41. Rollers 42 are evenly arranged horizontally within the roller mounting frame 41. The rollers 42 form a rolling friction pair with the middle transverse sliding plate 51. The rolling of the middle transverse sliding plate 51 on the rollers 42 generates less friction, less wear on the middle transverse sliding plate 51, and smoother movement of the middle transverse sliding plate 51.

[0029] The lower longitudinal sliding plate 4 is equipped with guide rollers 54 that guide the middle transverse sliding plate 51. The guide rollers 54 are arranged on both sides of the roller mounting frame 41 and are evenly spaced in the horizontal direction. The guide rollers 54 are in rolling contact on both sides of the middle transverse sliding plate 51. The middle transverse sliding plate 51 is located between the two rows of guide rollers 54. The guide rollers 54 limit the movement of the middle transverse sliding plate 51 on the lower longitudinal sliding plate 4, so that the middle transverse sliding plate 51 can only move in the horizontal direction on the lower longitudinal sliding plate 4. The rolling contact between the guide rollers 42 and the middle transverse sliding plate 51 reduces friction between the two, guiding the movement of the middle transverse sliding plate 51 without affecting the smoothness of the movement of the middle transverse sliding plate 51.

[0030] The mounting platform 1 is equipped with a plurality of longitudinal guide rails 11 extending in a horizontal longitudinal direction and arranged in parallel on the mounting platform 11. A guide block 43 is provided at the bottom of the lower longitudinal sliding plate 4, which cooperates with the longitudinal guide rail 11. The cross-section of the longitudinal guide rail 11 is waisted, and the guide block 43 is positioned vertically on the longitudinal guide rail 11. The longitudinal guide rail 11 guides the lower longitudinal sliding plate 4, defining its direction of movement. The cooperation between the guide block 11 and the waisted shape of the longitudinal guide rail 11 allows the lower longitudinal sliding plate 4 to be vertically positioned on the mounting platform 1, ensuring that the torsion and sway loading mechanism 3 does not tilt during movement and remains horizontal.

[0031] The upper torsion assembly 6 comprises a thrust bearing 61 mounted on the middle transverse power assembly and a swing arm mounting platform 62 associated with the thrust bearing 61. The lower end plate of the air spring 100 extends into the swing arm mounting platform 62 and is connected to the thrust bearing 61. A swing radius adjustment assembly 7 for adjusting the swing radius of the upper torsion assembly 6 is mounted on the mounting platform 1. The swing arm mounting platform 62 and the swing radius adjustment assembly 7 are hingedly connected to form a swing fulcrum. The lower end plate of the air spring 100 is connected to the thrust bearing 61. When the thrust bearing 61 and the swing arm mounting platform 62 swing around the swing fulcrum with the middle transverse sliding plate 51, the air spring 100 is subjected to torsion. The relative rotation of the upper and lower rings of the thrust bearing 61 accommodates the torsion of the air spring 100, causing the lower end plate of the air spring to rotate. This generates a torsional angle of the air spring during its swing, creating a compound torsional pendulum motion of the air spring, combining swing and torsion, simulating the torsional pendulum motion experienced in actual air spring operation.

[0032] Among them, the swing arm mounting platform 62 includes a mounting platform 63 equipped with a thrust bearing, a swing arm 64 extending horizontally from the mounting platform 63, and a swing radius adjustment component 7 includes a support seat 71 mounted on the mounting platform 1 and guided by the longitudinal guide rail 11, a support column 72 mounted on the support seat 71 and vertically arranged, and a screw pusher 73 mounted on the mounting platform 1 and pushing the support seat 71 to move along the longitudinal guide rail 11. The upper end of the support column 72 is hinged to the swing arm 64 to form a swing fulcrum. A strip hole 65 parallel to the longitudinal guide rail is opened on the swing arm 64. An upper positioning bolt 74 extending from the strip hole 65 is installed on the support column 72. A lower positioning bolt 75 for positioning the support seat 71 on the longitudinal guide rail 11 is installed at the bottom of the support seat 71. The swing radius of the mounting platform 63 is determined by the locking of the upper positioning bolt 74 and the lower positioning bolt 75. The screw pusher 73 rotates the screw through the handle, and the support seat 71 slides along the longitudinal guide rail 11 as the screw rotates, driving the support column 72 to move horizontally and longitudinally, and the upper positioning bolt 74 to move in the strip hole 65. When the desired swing radius is adjusted, the upper positioning bolt 74 is locked, so that the support column 72 can no longer move longitudinally on the swing arm 64, and the support seat 71 can no longer move on the longitudinal guide rail 11, thereby determining the swing radius of the mounting platform 63. The screw pusher 73 realizes stepless automatic adjustment of the swing radius, improving the operability and convenience of adjustment. The support seat 71 and the lower longitudinal sliding plate 4 are both guided and coordinated with the longitudinal guide rail 11. The longitudinal guide rail 11 plays a multiple role in guiding and positioning the lower longitudinal sliding plate 4, vertically positioning the lower longitudinal sliding plate 4 on the mounting platform, and guiding the support seat 71 to form a multiple role in guiding and adjusting the swing radius, improving the compactness, stability and adjustment reliability of the test device structure, and simplifying the internal matching structure.

[0033] The vertical loading assembly 2 includes a vertical guide post 21 mounted vertically on the mounting platform 1, a loading plate 22 that cooperates with the vertical guide post 21, a top plate 23 mounted above the loading plate 22 and fixed to the vertical guide post 21, a loading force transmission plate 24 mounted at the bottom of the loading plate 22, and a vertical loading motor 25 mounted on the top plate 23 and connected to the loading plate 22. The upper cover of the air spring 100 is connected to the loading force transmission plate 24. The vertical loading motor 25 applies a vertical load to the loading plate 22 and transmits the load to the air spring 100 through the loading force transmission plate 24, ensuring the effectiveness and reliability of the vertical loading of the air spring 100.

[0034] The above fully describes the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the embodiments described are only part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

Claims

1. An air spring torsional pendulum fatigue test apparatus includes a horizontally arranged mounting platform and a vertical loading assembly for applying a vertical load to the air spring. The vertical loading assembly is mounted on the mounting platform and is characterized by: The mounting platform is provided with a torsion pendulum loading mechanism having three moving layers: upper, middle and lower. The air spring is vertically mounted between the torsion pendulum loading mechanism and the vertical loading assembly. The horizontal longitudinal movement of the lower layer of the torsion pendulum loading mechanism, the horizontal lateral movement of the middle layer on the lower layer, and the torsion of the upper layer on the middle layer combine to form a torsion pendulum motion that drives the air spring to torsion. The torsion-swing loading mechanism includes a lower longitudinal sliding plate that can move horizontally longitudinally on the mounting platform, a middle transverse power assembly mounted on the lower longitudinal sliding plate and having horizontal transverse loading power, and an upper torsion assembly rotatably mounted on the middle transverse power assembly. The upper torsion assembly is connected to the mounting platform to form a swing fulcrum. The upper torsion assembly is connected to the lower end plate of the air spring. The lower longitudinal sliding plate slides on the mounting platform as the middle transverse power assembly moves, causing the upper torsion assembly to swing and generate torsion. The lower longitudinal sliding plate cooperates with the mounting platform along the horizontal longitudinal guide, and the middle transverse power assembly cooperates with the lower longitudinal sliding plate along the horizontal transverse guide, and forms a rolling friction pair with the lower longitudinal sliding plate; The middle-layer transverse power assembly includes a middle-layer transverse sliding plate that forms a rolling friction pair with the lower-layer longitudinal sliding plate, a transverse oil cylinder that pushes the middle-layer transverse sliding plate to reciprocate, and an oil cylinder support mounted on the mounting platform. The transverse oil cylinder is arranged horizontally and laterally, and the telescopic end is hinged to the middle-layer transverse sliding plate through a rotating ball head, and the mounting end is mounted on the oil cylinder support. The upper torsion assembly includes a thrust bearing installed on the middle-level lateral power assembly and a swing arm mounting platform equipped with the thrust bearing. The lower end plate of the air spring extends into the swing arm mounting platform and is connected to the thrust bearing. The mounting platform is equipped with a swing radius adjustment assembly for adjusting the swing radius of the upper torsion assembly. The swing arm mounting platform and the swing radius adjustment assembly are hinged to form a swing fulcrum.

2. The air spring torsional fatigue testing device according to claim 1, characterized in that: The top surface of the lower longitudinal sliding plate is provided with a roller installation frame, in which rollers evenly arranged horizontally are installed, and a rolling friction pair is formed between the rollers and the middle transverse sliding plate.

3. The air spring torsional fatigue testing device according to claim 2, characterized in that: The lower longitudinal sliding plate is equipped with guide rollers for guiding the middle transverse sliding plate. The guide rollers are arranged on both sides of the roller installation frame and are evenly arranged along the horizontal direction. Both sides of the middle transverse sliding plate are in rolling contact with the guide rollers respectively.

4. The air spring torsional fatigue testing device according to claim 1, characterized in that: The installation platform is equipped with longitudinal guide rails along the horizontal longitudinal direction. There are multiple longitudinal guide rails and they are laid in parallel on the installation platform. The bottom of the lower longitudinal sliding plate is provided with a guide block that cooperates with the longitudinal guide rail. The cross-section of the longitudinal guide rail is waisted in shape, and the guide block is vertically positioned on the longitudinal guide rail.

5. The air spring torsional fatigue testing device according to claim 1, characterized in that: The swing arm mounting platform includes a mounting platform equipped with a thrust bearing and a swing arm extending horizontally from the mounting platform. The swing radius adjustment assembly includes a support seat mounted on the mounting platform and coordinated with the longitudinal guide rail, a support column mounted on the support seat and vertically arranged, and a screw pusher mounted on the mounting platform and pushing the support seat to move along the longitudinal guide rail. The upper end of the support column is hinged to the swing arm to form a swing fulcrum. A strip hole parallel to the longitudinal guide rail is opened on the swing arm. An upper positioning bolt extending from the strip hole is installed on the support column. A lower positioning bolt is installed at the bottom of the support seat to position the support seat on the longitudinal guide rail. The swing radius of the mounting platform is determined by the locking of the upper positioning bolt and the lower positioning bolt.

6. The air spring torsional fatigue testing device according to claim 1, characterized in that: The vertical loading assembly includes a vertical guide column vertically mounted on the mounting platform, a loading plate guided by the vertical guide column, a top plate mounted above the loading plate and fixed to the vertical guide column, a loading force transmission plate mounted on the bottom of the loading plate, and a vertical loading motor mounted on the top plate and connected to the loading plate. The upper cover of the air spring is connected to the loading force transmission plate.

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