Air spring bending fatigue testing device

Abstract

The present invention relates to the field of mechanical component testing, and in particular to an air spring bending fatigue test device. The technical problem of the present invention is that it is not easy to simulate the mass of a vehicle body, the change of the center of gravity of the vehicle body and the bumpy road surface when the current equipment tests the air spring, resulting in insufficient accuracy in the air spring test. An air spring bending fatigue test device includes a frame, a balancing leg and a counterweight mechanism. An opening for taking and placing materials is opened on one side of the frame, four balancing legs are installed at the bottom of the frame, and a counterweight mechanism is provided in the upper part of the frame. The present invention drives the slider to slide on the guide rail through two adjusting rods, thereby driving the semicircular convex plate one or the semicircular convex plate two to move through the slider, thereby changing the position where each semicircular convex plate one and each semicircular convex plate two contact the wheel, thereby more realistically simulating the uneven road surface and further improving the authenticity and accuracy of the air spring body test.

Description

Technical Field

[0001] The invention relates to the field of mechanical component testing, and in particular to a bending fatigue testing device for an air spring. Background Art

[0002] As a low-frequency vibration absorber, air spring has the advantages of variable stiffness, high controllability and good vibration isolation effect.

[0003] In addition to bearing the vertical load from the vehicle body, the air spring also needs to bear the alternating load caused by the uneven road surface. Under the action of the alternating load, the air spring is prone to fatigue damage, which directly affects the service life of the air spring. Therefore, the air spring has very high requirements in terms of stiffness, fatigue and reliability.

[0004] It is very expensive to test the stiffness and fatigue life of air springs through real tests, so simulation tests are generally used now. However, current equipment is not easy to simulate the mass of the vehicle body, changes in the center of gravity of the vehicle body, and bumpy roads when testing air springs, resulting in insufficient authenticity and accuracy in the air spring test. Summary of the invention

[0005] In order to overcome the shortcomings of current equipment that is difficult to simulate vehicle body mass, changes in vehicle body center of gravity and bumpy roads when testing air springs, resulting in insufficient accuracy in air spring testing, the present invention provides an air spring bending fatigue testing device that can more realistically simulate vehicle body mass, changes in vehicle body center of gravity and bumpy roads, thereby improving the accuracy of air spring testing.

[0006] Technical solution: An air spring bending fatigue test device includes a frame, a balancing leg, a counterweight mechanism, a lifting mechanism and a pushing mechanism. An opening for taking and placing materials is opened on one side of the frame. Four balancing legs are installed at the bottom of the frame. A counterweight mechanism is provided in the upper part of the frame, and the counterweight mechanism is used to apply downward pressure to the air spring body. A lifting mechanism is provided on the frame and the counterweight mechanism, and the lifting mechanism is used to lift the counterweight mechanism. A pushing mechanism is provided in the lower part of the frame, and the pushing mechanism is used to push the air spring body.

[0007] In addition, it is particularly preferred that the counterweight mechanism includes a sliding block, a connecting shaft, a counterweight, a torsion spring, an upper connecting frame, a lower connecting frame and a wheel, a sliding block is slidingly provided on both sides of the upper opposite parts of the frame, a connecting shaft is rotatably connected to each of the two sliding blocks, a counterweight is installed between the two connecting shafts, a torsion spring is respectively connected between the sides of the two sliding blocks close to each other and the two opposite side faces of the counterweight, the torsion spring is wound on the connecting shaft, an upper connecting frame is installed at the lower part of the counterweight, the lower part of the upper connecting frame is connected to an air spring body, the lower part of the air spring body is connected to a lower connecting frame, and a wheel is rotatably provided at the lower part of the lower connecting frame.

[0008] In addition, it is particularly preferred that the lifting mechanism includes a cross bar, an electric push rod and a lifting plate, and two cross bars are respectively installed on the other two opposite sides of the counterweight block, the two cross bars on the same side form a group, the two groups of cross bars are symmetrically arranged, and the two groups of cross bars pass through the upper part of the frame, and two electric push rods are respectively installed on the opposite sides of the upper outer part of the frame, the two electric push rods on the same side form a group, and a lifting plate is installed between the telescopic rods of the two electric push rods in each group, and the lifting plate on the same side is located below the two cross bars on the same side.

[0009] In addition, it is particularly preferred that the pushing mechanism includes a driving roller, a servo motor, a transmission assembly, a transmission belt, a guide rail, a slider, a semicircular convex plate one and a semicircular convex plate two, two driving rollers are rotatably provided in the lower part of the frame, a servo motor is installed at the bottom of the frame, a transmission assembly is connected between the output shaft of the servo motor and one of the driving rollers, a transmission belt is connected between the two driving rollers, six guide rails are installed on the transmission belt, the guide rails are made of iron, and a slider is slidably provided on each guide rail, four of the sliders are installed with semicircular convex plate one, and the other two sliders are installed with semicircular convex plate two.

[0010] In addition, it is particularly preferred that both sides of the semicircular convex plate 1 are arranged in arcs, one side of the semicircular convex plate 2 is arranged in an arc, and the other side of the semicircular convex plate 2 is arranged vertically.

[0011] Furthermore, it is particularly preferred that the transmission assembly consists of two pulleys and a flat belt, wherein one pulley is connected to the output shaft of the servo motor, the other pulley is connected to one of the driving rollers, and a flat belt is wound between the two pulleys.

[0012] In addition, it is particularly preferred that a position adjustment mechanism is further included, the position adjustment mechanism is arranged on the frame and the slider, the position adjustment mechanism is used to adjust the position of the semicircular convex plate 1 and the semicircular convex plate 2, the position adjustment mechanism includes an adjustment rod, an adjustment frame, a corrugated groove circular plate, a vertical plate and a roller, and an adjustment rod is fixedly installed on the opposite sides of each slider, and the two adjustment rods located on the same slider are a group, wherein the two adjustment rods in the four groups are respectively passed through the two sides of the four semicircular convex plates 1, and the two adjustment rods in the other two groups are respectively passed through the two semicircular convex plates 2 The adjusting frame is slidably provided on one side of the middle part of the frame, and the two inner side surfaces at the lower part of the adjusting frame are in contact with one end of the two adjusting rods on the slider, and the distance between the two adjusting rods on each slider is equal to the distance between the two inner side surfaces at the lower part of the adjusting frame. A corrugated groove circular plate is installed on the driving roller close to one side of the adjusting frame, and a corrugated groove is opened on one side of the corrugated groove circular plate. A vertical plate is installed on the side of the adjusting frame close to the corrugated groove circular plate, and a roller is rotatably provided on the other side of the vertical plate, and the roller is located in the corrugated groove on the corrugated groove circular plate.

[0013] In addition, it is particularly preferred that it also includes a center of gravity adjustment mechanism, which is arranged on the counterweight block, and the center of gravity adjustment mechanism is used to adjust the center of gravity of the counterweight block. The center of gravity adjustment mechanism includes a center of gravity block, a positioning frame and a vertical spring. A center of gravity block is slidably provided on the counterweight block, and a positioning frame is slidably provided on the center of gravity block. Two vertical springs are connected between the positioning frame and the center of gravity block, and the lower part of the positioning frame is in contact with the inner bottom of the counterweight block.

[0014] In addition, it is particularly preferred that a magnet block is further included, and a magnet block is installed on one side of each slider, and the magnet block is adsorbed on one side of the guide rail.

[0015] In addition, it is particularly preferred that a transverse plate and a roller are further included, wherein a transverse plate is fixedly installed in the middle of the frame, and a plurality of rollers are rotatably arranged at even intervals on the upper portion of the transverse plate, and the rollers are in contact with one side of the transmission belt.

[0016] The beneficial effects of the present invention are: 1. By starting the servo motor to drive the transmission belt to rotate, the transmission belt drives the semicircular convex plate one and the semicircular convex plate two to move, and the semicircular convex plate one and the semicircular convex plate two contact the wheel in turn. After the semicircular convex plate one or the semicircular convex plate two contacts the wheel, the wheel, the lower connecting frame, the air spring body, the upper connecting frame, the sliding block, the connecting shaft, the counterweight block, the torsion spring and the cross bar will move upward, and the air spring body will be compressed accordingly; after the semicircular convex plate one or the semicircular convex plate two is separated from the wheel, the wheel, the lower connecting frame, the upper connecting frame, the sliding block, the connecting shaft, the counterweight block, the torsion spring and the cross bar will move downward and reset under the action of the air spring body, and this process is repeated, which can simulate the air spring body bearing the vertical load brought by the vehicle body and the alternating load brought by the uneven road surface, thereby improving the authenticity and accuracy of the air spring body inspection.

[0017] 2. The two adjusting rods will drive the slider to slide on the guide rail, thereby driving the semicircular convex plate 1 or semicircular convex plate 2 to move, thereby changing the position where each semicircular convex plate 1 and each semicircular convex plate 2 contacts the wheel, thereby more realistically simulating the uneven road surface and further improving the authenticity and accuracy of the air spring body inspection.

[0018] 3. By adjusting the movement of the center of gravity block in the counterweight block, the center of gravity of the counterweight block is changed, and then the inclination angle of the air spring body during inspection is changed, thereby changing the direction of force when the air spring body contacts the semicircular convex plate one or the semicircular convex plate two, thereby increasing the diversity of air spring body inspection, thereby more realistically simulating the change in vertical load caused by the change in the center of gravity of the vehicle body on the air spring body, and further improving the authenticity and accuracy of the air spring body inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a cross-sectional three-dimensional structural schematic diagram of the present invention.

[0021] Figure 3 It is a three-dimensional structural schematic diagram of the counterweight mechanism, lifting mechanism and jacking mechanism of the present invention.

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the jacking mechanism and the position adjustment mechanism of the present invention.

[0023] Figure 5 It is a three-dimensional structural schematic diagram of the position adjustment mechanism and the center of gravity adjustment mechanism of the present invention.

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the position adjustment mechanism of the present invention.

[0025] Figure 7 It is a three-dimensional structural schematic diagram of the guide rail, slider and magnet block of the position adjustment mechanism of the present invention.

[0026] Figure 8 It is a schematic diagram of the disassembled three-dimensional structure of the jacking mechanism, position adjustment mechanism, cross plate and some parts of the roller of the present invention.

[0027] Fig. 9 It is a schematic diagram of the disassembled three-dimensional structure of some parts of the counterweight mechanism, lifting mechanism and center of gravity adjustment mechanism of the present invention.

[0028] In the figure: 1, frame, 2, opening, 3, balancing leg, 41, sliding block, 42, connecting shaft, 43, counterweight, 44, torsion spring, 45, upper connecting frame, 46, air spring body, 47, lower connecting frame, 48, wheel, 51, cross bar, 52, electric push rod, 53, lifting plate, 61, driving roller, 62, servo motor, 63, transmission assembly, 64, transmission belt, 65, guide rail, 66, slider, 67, semicircular convex plate one, 68, semicircular convex plate two, 71, adjusting rod, 72, adjusting frame, 73, corrugated groove circular plate, 74, vertical plate, 75, roller, 81, center of gravity block, 82, positioning frame, 83, vertical spring, 9, magnet block, 10, cross plate, 11, roller. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0030] Embodiment 1: An air spring bending fatigue test device, such as Figure 1-Figure 9As shown, it includes a frame 1, balancing legs 3, a counterweight mechanism, a lifting mechanism and a pushing mechanism. An opening 2 for taking and placing materials is opened on one side of the frame 1. Four balancing legs 3 are installed at the bottom of the frame 1. A counterweight mechanism is provided at the upper part of the frame 1, and the counterweight mechanism is used to apply downward pressure to the air spring body 46. A lifting mechanism is provided on the frame 1 and the counterweight mechanism, and the lifting mechanism is used to lift the counterweight mechanism. A pushing mechanism is provided at the lower part of the frame 1, and the pushing mechanism is used to push the air spring body 46.

[0031] The counterweight mechanism includes a sliding block 41, a connecting shaft 42, a counterweight 43, a torsion spring 44, an upper connecting frame 45, a lower connecting frame 47 and a wheel 48. A sliding block 41 is slidably provided on both sides of the upper opposite sides of the frame 1. A connecting shaft 42 is rotatably connected to each of the two sliding blocks 41 through a bearing. A counterweight 43 is installed between the two connecting shafts 42. A torsion spring 44 is respectively connected between the sides of the two sliding blocks 41 that are close to each other and the two opposite side faces of the counterweight 43. The torsion spring 44 is wound around the connecting shaft 42. An upper connecting frame 45 is installed at the lower part of the counterweight 43. The lower part of the upper connecting frame 45 is connected to an air spring body 46. The lower part of the air spring body 46 is connected to a lower connecting frame 47. A wheel 48 is rotatably provided at the lower part of the lower connecting frame 47.

[0032] The lifting mechanism includes a cross bar 51, an electric push rod 52 and a lifting plate 53. Two cross bars 51 are respectively installed on the other two opposite sides of the counterweight block 43. The two cross bars 51 on the same side form a group. The two groups of cross bars 51 are symmetrically arranged. The two groups of cross bars 51 pass through the upper part of the frame 1. Two electric push rods 52 are respectively installed on the opposite sides of the outer upper part of the frame 1 by bolts. The two electric push rods 52 on the same side form a group. A lifting plate 53 is installed between the telescopic rods of the two electric push rods 52 in each group. The lifting plate 53 on the same side is located below the two cross bars 51 on the same side.

[0033] The pushing mechanism includes a driving roller 61, a servo motor 62, a transmission assembly 63, a transmission belt 64, a guide rail 65, a slider 66, a semicircular convex plate 1 67 and a semicircular convex plate 2 68. Two driving rollers 61 are rotatably provided at the lower part of the frame 1. A servo motor 62 is installed at the bottom of the frame 1. A transmission assembly 63 is connected between the output shaft of the servo motor 62 and one of the driving rollers 61. A transmission belt 64 is connected between the two driving rollers 61. Six guide rails 65 are installed on the transmission belt 64. The guide rails 65 are made of iron. A slider 66 is slidably provided on each guide rail 65. Semicircular convex plate 1 67 is installed on four of the sliders 66, and semicircular convex plate 2 68 is installed on the other two sliders 66.

[0034] Both sides of the semicircular convex plate 1 67 are arranged in arc shape, one side of the semicircular convex plate 2 68 is arranged in arc shape, and the other side of the semicircular convex plate 2 68 is arranged in vertical shape.

[0035] The transmission assembly 63 consists of two pulleys and a flat belt, one of which is connected to the output shaft of the servo motor 62 via a spline, and the other is connected to one of the driving rollers 61 via a spline, and a flat belt is wound between the two pulleys.

[0036] When fatigue testing the air spring body 46 is to be performed, the operator first controls the telescopic rods of the four electric push rods 52 to retract, the telescopic rods of the four electric push rods 52 drive the two lifting plates 53 to move upward, the two lifting plates 53 drive the two sets of cross bars 51 to move upward, the two sets of cross bars 51 drive the counterweight block 43, the two sliding blocks 41, the two connecting shafts 42, the two torsion springs 44 and the upper connecting frame 45 to move upward, the operator connects one side of the air spring body 46 to the upper connecting frame 45 by bolts, and the other side of the air spring body 46 is connected to the lower connecting frame 47 by bolts, and the air spring is installed. After the main body 46 is moved, the telescopic rods of the four electric push rods 52 are controlled to extend, and the telescopic rods of the four electric push rods 52 drive the two lifting plates 53 to move downward, and the two lifting plates 53 are separated from the two sets of cross bars 51. Under the action of gravity, the two sets of cross bars 51, the counterweight block 43, the two sliding blocks 41, the two connecting shafts 42, the two torsion springs 44, the upper connecting frame 45, the air spring main body 46, the lower connecting frame 47 and the wheel 48 move downward. After the wheel 48 contacts the outer upper part of the transmission belt 64, the two sets of cross bars 51, the counterweight block 43, the two sliding blocks 41, the two connecting shafts 42, the two torsion springs 44 , the upper connecting frame 45, the air spring body 46, the lower connecting frame 47 and the wheel 48 no longer move downward. Under the gravity of the counterweight 43, the air spring body 46 is slightly compressed at the beginning. The operator starts the servo motor 62 to rotate, and drives one of the driving rollers 61 to rotate through the transmission assembly 63. One of the driving rollers 61 drives the transmission belt 64 to rotate, and the transmission belt 64 drives the other driving roller 61 to rotate. The transmission belt 64 drives six guide rails 65, six sliders 66, semicircular convex plate 1 67 and semicircular convex plate 2 68 to move. The semicircular convex plate 1 67 and the semicircular convex plate 2 68 are in turn connected with the semicircular convex plate 1 When the wheel 48 contacts, after the semicircular convex plate 1 67 or the semicircular convex plate 2 68 contacts the wheel 48, the wheel 48, the lower connecting frame 47, the air spring body 46, the upper connecting frame 45, the sliding block 41, the connecting shaft 42, the counterweight 43, the torsion spring 44 and the cross bar 51 will move upward, and the air spring body 46 will be compressed accordingly; after the semicircular convex plate 1 67 or the semicircular convex plate 2 68 separates from the wheel 48, the wheel 48, the lower connecting frame 47, the upper connecting frame 45, the sliding block 41, the connecting shaft 42, the counterweight 43, the torsion spring 44 and the cross bar 51 will move downward and reset under the action of the air spring body 46;By repeating this process, the air spring body 46 can be simulated to bear the vertical load brought by the vehicle body and the alternating load brought by the uneven road surface, thereby improving the authenticity and accuracy of the inspection of the air spring body 46. After the inspection of the air spring body 46 is completed, the operator turns off the servo motor 62, and then controls the telescopic rods of the four electric push rods 52 to retract, and the telescopic rods of the four electric push rods 52 drive the two lifting plates 53 to move upward, and the two lifting plates 53 drive the two sets of cross bars 51, the counterweight block 43, the two sliding blocks 41, the two connecting shafts 42, the two torsion springs 44, the upper connecting frame 45, the air spring body 46, the lower connecting frame 47 and the wheel 48 to move upward. After the wheel 48 is separated from the transmission belt 64, the operator can take out the inspected air spring body 46. ;

[0037] Embodiment 2: Based on embodiment 1, Figure 3-Figure 8 As shown, it also includes a position adjustment mechanism, which is arranged on the frame 1 and the slider 66. The position adjustment mechanism is used to adjust the position of the semicircular convex plate 1 67 and the semicircular convex plate 2 68. The position adjustment mechanism includes an adjustment rod 71, an adjustment frame 72, a corrugated groove circular plate 73, a vertical plate 74 and a roller 75. Each slider 66 has an adjustment rod 71 welded on both sides of the slider 66. The two adjustment rods 71 ​​on the same slider 66 form a group, wherein the two adjustment rods 71 ​​in the four groups are respectively passed through the two sides of the four semicircular convex plates 1 67, and the two adjustment rods 71 ​​in the other two groups are respectively passed through the two sides of the two semicircular convex plates 2 68. One of the middle parts of the frame 1 The side sliding type is provided with an adjustment frame 72, which will slide up and down along the frame 1, and the two inner side surfaces at the lower part of the adjustment frame 72 are in contact with one end of the two adjustment rods 71 ​​on the slider 66, and the distance between the two adjustment rods 71 ​​on each slider 66 is equal to the distance between the two inner side surfaces at the lower part of the adjustment frame 72, and a corrugated groove circular plate 73 is installed on the driving roller 61 close to the side of the adjustment frame 72, and a corrugated groove is opened on one side of the corrugated groove circular plate 73, and a vertical plate 74 is installed on the side of the adjustment frame 72 close to the corrugated groove circular plate 73, and a roller 75 is rotatably provided on the other side of the vertical plate 74, and the roller 75 is located in the corrugated groove on the corrugated groove circular plate 73.

[0038] When one of the driving rollers 61 rotates, it drives the corrugated groove circular plate 73 to rotate, and under the action of the corrugated grooves of the corrugated groove circular plate 73, it drives the vertical plate 74 and the roller 75 to move back and forth continuously up and down, and the vertical plate 74 drives the adjustment frame 72 to move back and forth continuously up and down. When the two adjustment rods 71 ​​on one of the sliders 66 move to contact the two inner side surfaces of the lower part of the adjustment frame 72, under the guiding action of the two inner side surfaces of the lower part of the adjustment frame 72, the two adjustment rods 71 ​​will drive the slider 66 to slide on the guide rail 65, thereby driving the semicircular convex plate 1 67 or the semicircular convex plate 2 68 to move through the slider 66, and then changing the contact position of each semicircular convex plate 1 67 and each semicircular convex plate 2 68 with the wheel 48, so as to more realistically simulate the uneven road surface and further improve the authenticity and accuracy of the inspection of the air spring body 46.

[0039] Embodiment 3: Based on embodiment 2, Figure 3-Figure 9 As shown, it also includes a center of gravity adjustment mechanism, which is arranged on the counterweight block 43. The center of gravity adjustment mechanism is used to adjust the center of gravity of the counterweight block 43. The center of gravity adjustment mechanism includes a center of gravity block 81, a positioning frame 82 and a vertical spring 83. A center of gravity block 81 is slidably provided on the counterweight block 43, and the center of gravity block 81 will slide horizontally along the counterweight block 43. A positioning frame 82 is slidably provided on the center of gravity block 81, and two vertical springs 83 are connected between the positioning frame 82 and the center of gravity block 81. The lower part of the positioning frame 82 is in contact with the inner bottom of the counterweight block 43.

[0040] A magnet block 9 is also included. A magnet block 9 is installed on one side of each slider 66 , and the magnet block 9 is adsorbed on one side of the guide rail 65 .

[0041] It also includes a transverse plate 10 and rollers 11. A transverse plate 10 is fixedly installed in the middle of the frame 1. Fourteen rollers 11 are rotatably arranged on the upper part of the transverse plate 10 at even intervals. The rollers 11 contact one side of the transmission belt 64.

[0042] The operator pulls the positioning frame 82 to move upward, and the vertical spring 83 is compressed accordingly. After the bottom of the positioning frame 82 is separated from the bottom of the counterweight block 43, the operator drives the center of gravity block 81 to move in the counterweight block 43 through the positioning frame 82. After the center of gravity block 81 moves to a suitable position, the operator releases the positioning frame 82, and under the action of the vertical spring 83, the positioning frame 82 moves downward and contacts with the bottom of the counterweight block 43, thereby fixing the position of the center of gravity block 81. When the center of gravity block 81 moves to one side of the counterweight block 43, the center of gravity of the counterweight block 43 will move to one side, and the counterweight block 43, the center of gravity block 81, the positioning frame 82, the vertical spring 83 and the four cross bars 51 will swing, and the torque The spring 44 twists accordingly, and the counterweight 43 drives the upper connecting frame 45, the air spring body 46, the lower connecting frame 47 and the wheel 48 to tilt. The center of gravity block 81 is adjusted to move inside the counterweight 43, thereby changing the center of gravity of the counterweight 43, and then changing the inclination angle of the air spring body 46 during inspection, thereby changing the direction of force applied to the air spring body 46 when it contacts the semicircular convex plate 1 67 or the semicircular convex plate 2 68, thereby increasing the diversity of the inspection of the air spring body 46, thereby more realistically simulating the change in the vertical load caused by the change in the center of gravity of the vehicle body on the air spring body 46, and further improving the authenticity and accuracy of the inspection of the air spring body 46.

[0043] When the slider 66 drives the semicircular convex plate 1 67 or the semicircular convex plate 2 68 to move in the guide rail 65, the slider 66 will drive the magnet block 9 to move. After the slider 66 and the magnet block 9 stop moving, the magnet block 9 is adsorbed on the guide rail 65, thereby fixing the position of the slider 66, and then fixing the position of the semicircular convex plate 1 67 or the semicircular convex plate 2 68.

[0044] When the transmission belt 64 moves, under the guidance of the roller 11 , the transmission belt 64 moves more smoothly, and the upper part of the transmission belt 64 can be supported by the cross plate 10 , thereby reducing the deformation of the transmission belt 64 .

[0045] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. An air spring bending fatigue test device, characterized in that: The invention comprises a frame (1), a balancing leg (3), a counterweight mechanism, a lifting mechanism and a pushing mechanism. An opening (2) for taking in and putting out materials is provided on one side of the frame (1). Four balancing legs (3) are installed at the bottom of the frame (1). A counterweight mechanism is provided at the upper part of the frame (1). The counterweight mechanism is used to apply downward pressure to the air spring body (46). A lifting mechanism is provided on the frame (1) and the counterweight mechanism. The lifting mechanism is used to lift the counterweight mechanism. A pushing mechanism is provided at the lower part of the frame (1). The pushing mechanism is used to push the air spring body (46). The counterweight mechanism comprises a sliding block (41), a connecting shaft (42), a counterweight (43), a torsion spring (44), an upper connecting frame (45), a lower connecting frame (47) and a wheel (48). A sliding block (41) is slidably disposed on opposite sides of the upper portion of the frame (1). A connecting shaft (42) is rotatably connected to each of the two sliding blocks (41). A counterweight (43) is mounted between the two connecting shafts (42). A torsion spring (44) is connected between the sides of the two sliding blocks (41) close to each other and two opposite side surfaces of the counterweight (43). The torsion spring (44) is wound around the connecting shaft (42). An upper connecting frame (45) is mounted on the lower portion of the counterweight (43). The lower portion of the upper connecting frame (45) is connected to an air spring body (46). The lower portion of the air spring body (46) is connected to a lower connecting frame (47). A wheel (48) is rotatably disposed on the lower portion of the lower connecting frame (47). The jacking mechanism comprises a driving roller (61), a servo motor (62), a transmission assembly (63), a transmission belt (64), a guide rail (65), a slider (66), a semicircular convex plate 1 (67) and a semicircular convex plate 2 (68). Two driving rollers (61) are rotatably arranged at the lower part of the frame (1). A servo motor (62) is installed at the bottom of the frame (1). A transmission assembly (63) is connected between the output shaft of the servo motor (62) and one of the driving rollers (61). A transmission belt (64) is connected between the two driving rollers (61). Six guide rails (65) are installed on the transmission belt (64). The guide rails (65) are made of iron. Each guide rail (65) is slidably provided with a slider (66). Four of the sliders (66) are installed with semicircular convex plates 1 (67), and the other two sliders (66) are installed with semicircular convex plates 2 (68). The invention also includes a position adjustment mechanism, which is arranged on the frame (1) and the slider (66). The position adjustment mechanism is used to adjust the position of the semicircular convex plate 1 (67) and the semicircular convex plate 2 (68). The position adjustment mechanism includes an adjustment rod (71), an adjustment frame (72), a corrugated groove circular plate (73), a vertical plate (74) and a roller (75). An adjustment rod (71) is fixedly mounted on opposite sides of each slider (66). Two adjustment rods (71) located on the same slider (66) form a group. Two adjustment rods (71) in four groups respectively pass through the two sides of the four semicircular convex plates 1 (67), and two adjustment rods (71) in the other two groups respectively pass through the two sides of the two semicircular convex plates 2 (68). The frame ( 1) An adjustment frame (72) is slidably provided on one side of the middle portion, two inner side surfaces of the lower portion of the adjustment frame (72) are in contact with one end of two adjustment rods (71) on the slider (66), the distance between the two adjustment rods (71) on each slider (66) is equal to the distance between the two inner side surfaces of the lower portion of the adjustment frame (72), a corrugated groove circular plate (73) is installed on the driving roller (61) on the side close to the adjustment frame (72), one side of the corrugated groove circular plate (73) is provided with a corrugated groove, a vertical plate (74) is installed on the side of the adjustment frame (72) close to the corrugated groove circular plate (73), the other side of the vertical plate (74) is rotatably provided with a roller (75), and the roller (75) is located in the corrugated groove on the corrugated groove circular plate (73); The invention also includes a center of gravity adjustment mechanism, which is arranged on the counterweight block (43) and is used to adjust the center of gravity of the counterweight block (43). The center of gravity adjustment mechanism includes a center of gravity block (81), a positioning frame (82) and a vertical spring (83). A center of gravity block (81) is slidably provided on the counterweight block (43), a positioning frame (82) is slidably provided on the center of gravity block (81), two vertical springs (83) are connected between the positioning frame (82) and the center of gravity block (81), and the lower part of the positioning frame (82) contacts the inner bottom of the counterweight block (43).

2. The air spring bending fatigue testing device according to claim 1, characterized in that: The lifting mechanism comprises a cross bar (51), an electric push rod (52) and a lifting plate (53). Two cross bars (51) are respectively installed on the other two opposite sides of the counterweight (43). The two cross bars (51) on the same side form a group. The two groups of cross bars (51) are symmetrically arranged. The two groups of cross bars (51) pass through the upper part of the frame (1). Two electric push rods (52) are respectively installed on the opposite sides of the upper part of the frame (1). The two electric push rods (52) on the same side form a group. A lifting plate (53) is installed between the telescopic rods of the two electric push rods (52) in each group. The lifting plate (53) on the same side is located below the two cross bars (51) on the same side.

3. The air spring bending fatigue testing device according to claim 2, characterized in that: Both sides of the semicircular convex plate 1 (67) are arranged in arcs, one side of the semicircular convex plate 2 (68) is arranged in an arc, and the other side of the semicircular convex plate 2 (68) is arranged vertically.

4. The air spring bending fatigue testing device according to claim 3, characterized in that: The transmission assembly (63) is composed of two pulleys and a flat belt, wherein one pulley is connected to the output shaft of the servo motor (62), the other pulley is connected to one of the driving rollers (61), and a flat belt is wound between the two pulleys.

5. The air spring bending fatigue testing device according to claim 4, characterized in that: It also includes a magnet block (9), one side of each slider (66) is equipped with a magnet block (9), and the magnet block (9) is adsorbed on one side of the guide rail (65).

6. The air spring bending fatigue testing device according to claim 5, characterized in that: It also includes a transverse plate (10) and a roller (11). A transverse plate (10) is fixedly installed in the middle of the frame (1). A plurality of rollers (11) are rotatably arranged at even intervals on the upper part of the transverse plate (10). The rollers (11) are in contact with one side of the transmission belt (64).

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