An elliptical motion mechanism and simulated three-dimensional loading test device

Abstract

The present invention relates to the technical field of elastic rubber detection, and discloses an elliptical motion mechanism and a simulated three-dimensional loading test device. The elliptical motion mechanism includes a workbench, in which a first adjustment mechanism, a second adjustment mechanism, and a third adjustment mechanism are arranged. The first adjustment mechanism includes a slider A, a screw A, a support A, and a pin A. The second adjustment mechanism includes a support B, a pin B, a screw B, and two sliding assemblies. The sliding assemblies include the slider B, a slide bar, and a rotating pin. The third adjustment mechanism includes a support C, a slider C, a screw C, and an output shaft. When power is input to rotate the pin A and the slider A, the third adjustment mechanism can output the motion of an elliptical trajectory on the output shaft, and the parameters of the output elliptical trajectory can also be adjusted. The three-dimensional loading test device includes the above-mentioned elliptical motion mechanism and a vertical actuator. It only requires two prime movers to simulate three-dimensional loading conditions, is relatively inexpensive, and has a simple control scheme.

Description

Technical Field

[0001] The invention relates to the technical field of elastic rubber detection, in particular to an elliptical motion mechanism and a simulated three-way loading test device. Background Art

[0002] In vehicle engineering, elastic rubber is a commonly used component. For example, in new energy vehicles, rubber bushings in suspension systems, motor suspensions, and battery pack mounts all require elastic rubber. Similarly, in rail transit, EMU vehicles widely utilize rubber elastic components such as primary steel spring rubber pads, shock absorber rubber nodes, and air springs. When testing the performance of elastic rubber components, we generally focus on their static stiffness and damping properties. However, in practical applications, the various coupled motions of the vehicle body can subject elastic rubber components to triaxial forces and displacements. To ensure the reliability and durability of elastic rubber components under complex loading conditions, it is necessary to test their mechanical behavior and variations during triaxial loading. Therefore, a triaxial loading test platform for testing elastic rubber is urgently needed. Currently, most triaxial loading test platforms on the market focus on triaxial geotechnical forces studied in geotechnical mechanics. These platforms primarily utilize multiple actuators to simulate six-degree-of-freedom motion, resulting in high costs and complex control schemes requiring separate control of each actuator during testing. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide an elliptical motion mechanism and a simulated three-dimensional loading test device. The elliptical motion mechanism can output an elliptical trajectory under a single power drive, and the parameters of the output elliptical trajectory can be adjusted. The output elliptical trajectory can simulate horizontal and two-dimensional loading conditions. When combined with a vertical actuator, the three-dimensional loading test device only requires two prime movers to simulate a three-dimensional loading test, has a relatively low cost, and a simple control scheme.

[0004] The object of the present invention is achieved through the following technical solutions:

[0005] An elliptical motion mechanism includes a workbench, a first adjustment mechanism, a second adjustment mechanism and a third adjustment mechanism, the first adjustment mechanism includes a slider A, a screw rod A, a support A and a pin A, the slider A is rotatably connected to the workbench through the pin A, the screw rod A is rotatably set on the support A, and the screw rod A and the pin A are perpendicular to each other; the slider A is slidably connected to the support A, and the slider A is threadedly connected to the screw rod A; the second adjustment mechanism includes a support B, a pin B, a screw rod B and two sliding assemblies, the support B is rotatably connected to the support A through the pin B, the pin B is parallel to the pin A, the screw rod B is rotatably connected to the support B, the screw rod B and the pin B are perpendicular to each other, the threads at both ends of the screw rod B rotate in opposite directions, the sliding assembly includes a slider B, a slide rod and a turn pin, the slide rod is connected to the slider B through the turn pin The third adjustment mechanism comprises a support C, a slider C, a screw rod C, and an output shaft. The support C is fixedly connected to the support B, the slider C is slidably connected to the support C, the screw rod C is rotatably mounted on the support C, and the output shaft is fixedly mounted on the slider C. The output shaft is parallel to the support pin A, and the axial projection of the output shaft is located on the line connecting the axial projections of the two support pins. When the drive pin A and slider A rotate, the output shaft can output an elliptical trajectory. The parameters of the output elliptical trajectory can be adjusted by the first adjustment mechanism, the second adjustment mechanism, and the third adjustment mechanism.

[0006] Furthermore, it also includes a scaling unit, which includes a long link A, a long link B, a short link A, and a short link B. The long link A and the long link B have the same length, the short link A and the short link B have the same length, and the length of the long link A is twice the length of the short link A; one end of the long link A is rotatably connected to the workbench, the other end of the long link A is rotatably connected to one end of the long link B, the other end of the long link B forms an input end, one end of the short link A is rotatably connected to the center of the long link A, one end of the short link B is rotatably connected to the center of the long link B, one end of the short link A away from the long link A and one end of the short link B away from the long link B are rotatably connected to form an output end; the input end is rotatably connected to the output shaft.

[0007] Furthermore, there are a plurality of scaling units, and the scaling units are connected in sequence, and when connected, the output end of the previous scaling unit is rotatably connected to the input end of the next scaling unit.

[0008] The scaling unit can realize the conversion of the amplitude of the elliptical motion trajectory of the output shaft so as not to be restricted by structural size parameters when used to simulate bidirectional loading tests.

[0009] Specifically, it also includes a power mechanism and an adjustment drive mechanism, the power mechanism is used to drive the slider A to rotate, the adjustment drive mechanism includes a first motor, a second motor and a third motor, the first motor is used to drive the screw rod A actively, the second motor is used to drive the screw rod B to rotate, and the third motor is used to drive the screw rod C to rotate.

[0010] A simulated three-dimensional loading test device includes the aforementioned elliptical motion mechanism and a universal tooling, wherein the universal tooling includes a chassis and a bidirectional actuating shaft, one end of the bidirectional actuating shaft is fixedly connected to the chassis, and the other end of the bidirectional actuating shaft is rotatably connected to the output shaft or the output end of any of the scaling units.

[0011] Specifically, the workbench is horizontally arranged, the pin shaft A is vertically arranged, the chassis is arranged on the top surface of the workbench, and a plurality of balls are rotatably arranged on the bottom of the chassis, and the balls are arranged between the chassis and the top surface of the workbench.

[0012] Furthermore, it also includes a gantry and a vertical actuator, the vertical actuator is fixedly installed on the gantry, the vertical actuator is vertically arranged, the actuating end of the vertical actuator is fixedly connected to a top plate, and the top plate is arranged parallel to the top of the chassis.

[0013] During the test, the simulated three-dimensional loading test device can apply a vertical load through a vertical actuator and simulate horizontal two-dimensional loads through an elliptical motion mechanism, thereby simulating and completing a three-dimensional loading test as a whole.

[0014] The beneficial effects of the present invention are:

[0015] The elliptical motion mechanism includes a workbench, in which a first adjustment mechanism, a second adjustment mechanism and a third adjustment mechanism are arranged in sequence from bottom to top; the first adjustment mechanism includes a slider A, a screw rod A, a support A and a pin A, the slider A is rotatably connected to the workbench through the pin A, and when the screw rod A rotates, the support A and the slider A can be driven to slide relative to each other; the second adjustment mechanism includes a support B, a pin B, a screw rod B and two sliding assemblies, the support B is rotatably connected to the support A through the pin B, the threads at both ends of the screw rod B rotate in opposite directions, the sliding assembly includes a slider B, a slide rod and a rotating pin, and the slide rod is connected to the slide by the rotating pin. Block B is rotatably connected, and the slide is slidably connected to the workbench. The sliding trajectories of the two rotating pins are perpendicular to each other and their intersection is located on the axis of pin A. When screw B rotates, the two rotating pins can be moved closer or farther away from each other. The two rotating pins are symmetrically arranged on both sides of pin B. The third adjustment mechanism includes a support C, a slider C, a screw C, and an output shaft. Support C is fixedly connected to support B. When screw C is rotated, slider C and support C can slide relative to each other. The output shaft is fixedly mounted on slider C. Pin A, pin B, rotating pin, and output shaft are parallel to each other, and the axial projection of the output shaft is located on the line connecting the axial projections of the two rotating pins. When the elliptical motion mechanism is in use, it is adjusted to the distance between the axial projection of pin A and the axial projection of pin B, and the distance between the axial projection of pin B and the axial projection of the two rotating pins. When the input power causes pin A and slider A to rotate, the output shaft can output an elliptical trajectory. The parameters of the output elliptical trajectory can also be adjusted through the above-mentioned first adjustment mechanism, second adjustment mechanism, and third adjustment mechanism.

[0016] The three-dimensional loading test device includes the above-mentioned elliptical motion mechanism and a vertical actuator. The elliptical motion mechanism can output the motion of an elliptical trajectory and the parameters of the elliptical trajectory are adjustable. It can simulate mutually perpendicular two-dimensional loading conditions of the same frequency on the horizontal plane. The vertical actuator is used to complete the vertical loading. Therefore, only two prime movers are required to simulate the three-dimensional loading conditions. Compared with the six-degree-of-freedom multi-actuator loading separately, its cost is relatively low and the control scheme is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a simulated three-axis loading test device of the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of an elliptical motion mechanism of the present invention;

[0019] Figure 3 for Figure 2 The schematic diagram of the structure of the elliptical motion mechanism after removing the workbench;

[0020] Figure 4 for Figure 2 A schematic diagram of the structure of the adjustment device in the elliptical motion mechanism shown;

[0021] Figure 5 for Figure 2 The schematic diagram of the structure of the scaling unit in the elliptical motion mechanism shown;

[0022] Figure 6 This is a schematic structural diagram of a vertical actuator and a chassis in a simulated three-axis loading test device of the present invention;

[0023] Figure 7 for Figure 4 Schematic diagram of the principle of the regulating device shown;

[0024] In the figure, 1-workbench, 2-power mechanism, 3-chassis, 4-bidirectional actuating shaft, 5-gantry, 6-vertical actuator, 7-top plate, 10-first adjusting mechanism, 11-slider A, 12-screw A, 13-support A, 14-first motor, 20-second adjusting structure, 21-support B, 22-screw B, 23-slider B, 23-slide bar, 24-second motor, 30-third adjusting mechanism, 31-support C, 32-slider C, 33-screw C, 34-output shaft, 35-third motor, 40-scaling unit, 41-long connecting rod A, 42-long connecting rod B, 43-short connecting rod A, 44-short connecting rod B, 45-input end, 46-output end, 47-installation end. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0026] like Figures 2 to 5 As shown, an elliptical motion mechanism includes a workbench 1 , in which an adjustment device is arranged. The adjustment device includes a first adjustment mechanism 10 , a second adjustment mechanism 20 and a third adjustment mechanism 30 .

[0027] like Figure 4 As shown, the first adjustment mechanism 10 includes a slider A11, a screw A12, a support A13, and a pin A (not shown). The slider A11 is rotatably connected to the workbench 1 via the pin A; the screw A12 is rotatably mounted on the support A13, with the screw A12 and the pin A being perpendicular to each other. The slider A11 is slidably connected to the support A13, and the slider A11 and the screw A12 are threadedly connected, forming a screw-nut mechanism. When the screw A12 rotates, it drives the slider A11 to slide, thereby adjusting the position of the slider A11 on the support A13 by rotating the screw A11. Since the slider A11 is rotatably connected to the workbench 1 via the pin A, rotating the screw A11 adjusts the distance between any point on the support A13 and the pin A.

[0028] The second adjustment mechanism 20 comprises a support B21, a pin B (not shown), a screw B22, and two sliding assemblies. Support B21 is rotatably connected to support A13 via a pin B, which is parallel to pin A. Screw B22 is rotatably connected to support B21, with screw B22 and pin B perpendicular to each other. The sliding assemblies comprise a slider B23, a slide rod 24, and a pivot pin (not shown). Slide rod 24 is rotatably connected to slider B23 via a pivot pin, which is also parallel to pins A and B. Slider B23 is slidably mounted on support B21. The screw rod B22 is a double-ended screw with oppositely threaded ends. Two pivot pins are symmetrically positioned on either side of the pin shaft B, meaning they are equidistant from the pin shaft B. Two sliders B23 are threadedly connected to each end of the screw rod B22, forming a screw-nut mechanism. Rotating the screw rod 22 causes the two sliders B to move synchronously toward or away from each other, allowing the distances between the two pivot pins and the pin shaft B to be adjusted synchronously. A slide bar 24 is slidably connected to the workbench 1, with the two slide bars 24 sliding in perpendicular directions. The intersection of the two pivot pins' sliding trajectories lies on the axis of the pin shaft A.

[0029] The third adjustment mechanism 30 includes a support C31, a slider C32, a screw C33, and an output shaft 34. The slider C32 is slidably connected to the support C31, and the screw C33 is rotatably mounted on the support C31. The slider C32 and the screw C33 are threadedly connected, forming a screw-nut mechanism. When the screw C33 is rotated, the slider C32 is driven to slide on the support C31. The support C31 is fixedly connected to the support B21, and the output shaft 34 is fixedly mounted on the slider C32. The output shaft 34 is also parallel to the rotating pin, the pin A, and the pin B. The axial projection of the output shaft 34 is located on the line connecting the axial projections of the two rotating pins. When the screw C33 is rotated, the position of the axial projection of the output shaft 34 on the line connecting the axial projections of the two rotating pins can be adjusted.

[0030] When the adjustment mechanism is implemented, since the output shaft 34, the rotating pin, the pin A and the pin B are parallel to each other, the overall structure is a multi-layer structure. The entire structure is projected in the axial direction of the pin A. The working principle is as follows: Figure 7 As shown. According to the above correspondence: the sliding trajectories of the two rotating pins are perpendicular to each other and their intersection is located on the axis of the pin A; the support B21 is rotatably connected to the support A13 through the pin B, and when the screw A11 is rotated, the distance between any point on the support A13 (including the pin B connected to the support A13) and the pin A is adjusted; the two rotating pins are symmetrically arranged on both sides of the pin B, and the distance between the two rotating pins and the pin B can be synchronously adjusted by rotating the screw B22; the axial projection of the output shaft 34 is located on the line connecting the axial projections of the two rotating pins, and the position of the axial projection of the output shaft 34 on the line connecting the axial projections of the two rotating pins can be adjusted when the screw C33 is rotated. Reflected in Figure 7In the figure, point O is the projection of the axis of pin A, points C and D are the projections of the two rotating pin axes, point M is the projection of the axis of pin B, and point N is the projection of the axis of output shaft C. The x-axis and y-axis are the moving trajectories of the projections of the two rotating pin axes. When the relationship between the line segments in the figure satisfies the requirement of OM=MC=MD=r, when rotating around point O, point M is a circular trajectory. Since points C and D are constrained by the x-axis and y-axis trajectories respectively, the running trajectory of any point on the CD line except point M (including point N) is an ellipse. Since the adjustment mechanism is a multi-layer structure as a whole, its movement process is equivalent to Figure 7 The plane motion shown, thus the elliptical motion mechanism can realize the output shaft 34 to move along an elliptical trajectory when the driving pin A and the slider A11 continue to rotate.

[0031] In this adjustment mechanism, since the distance between the pin shaft B and the rotating pin shaft A can be adjusted by rotating the screw rod A11, the distance between the two rotating pins and the pin shaft B can be adjusted synchronously by rotating the screw rod B22. Figure 7 As shown, the value of r can be adjusted by coordinating the screw rods A11 and B22 while maintaining OM=MC=MD; when the screw rod C33 is rotated, the position of the axial projection of the output shaft 34 on the line connecting the axial projections of the two rotating pins can be adjusted, that is, Figure 7 As shown, the position of point N on segment CD can be adjusted by screw C33; thus, the parameters of the elliptical trajectory output by the output shaft 34 can be adjusted by rotating screw A11, screw B22, and screw C33.

[0032] During specific implementation, the elliptical motion mechanism also includes a power mechanism 2 and an adjustment drive mechanism. The power mechanism 2 can optionally use a drive motor, which is installed at the bottom of the workbench. The output shaft of the power mechanism 2 is fixedly connected to the pin A, and the pin A is fixedly connected to the slider A11 and rotatably connected to the workbench 1. The power mechanism 2 is used to provide power for the rotation of the pin A and the slider A11. The adjustment drive mechanism includes a first motor 14, a second motor 24, and a third motor 35. The first motor 14 is installed on the support A13, and its output shaft is fixedly connected to one end of the screw rod A12, which is used to drive the screw rod A12 to move actively; the second motor 24 is installed on the support B21, and its output shaft is fixedly connected to one end of the screw rod B22, which is used to drive the screw rod B22 to rotate; the third motor 35 is installed on the support C31, and its output shaft is fixedly connected to one end of the screw rod C33, which is used to drive the screw rod C33 to rotate. When in use, a controller is also provided. The power mechanism 2, the first motor 14, the second motor 24 and the third motor 35 are all electrically connected to the controller. The start and stop of the elliptical motion mechanism and the adjustment of the output trajectory elliptical parameters can be completed by inputting instructions, which is easy to operate.

[0033] Furthermore, the elliptical motion mechanism further includes a scaling unit 40, such as Figure 5As shown, the scaling unit 40 includes a long link A41, a long link B42, a short link A43, and a short link B44. The long link A41 and the long link B42 are of the same length, and the short link A43 and the short link B44 are of the same length. The lengths of the long link A41 and the long link B42 are twice the lengths of the short link A43 and the short link B44. One end of the long link A41 is a mounting end 47, and the other end of the long link A41 is rotatably connected to one end of the long link B42, and the other end of the long link B42 forms an input end 45; one end of the short link A43 is rotatably connected to the center of the long link A41, and one end of the short link B44 is rotatably connected to the center of the long link B42. The end of the short link A43 away from the long link A41 and the end of the short link B44 away from the long link B42 are rotatably connected to form an output end 46. Through the above-mentioned dimensional relationship and the design of the connection structure, as shown in FIG. Figure 5 As shown, after connection, regardless of how the angle between long connecting rod A 41 and long connecting rod B 42 changes, output end 46 remains at the midpoint of the line connecting mounting end 47 and input end 45. When the scaling unit 40 is in use, mounting end 47 is rotatably connected to the worktable 1, and input end 45 is rotatably connected to the output shaft 34. When the output shaft 34 outputs motion along an elliptical trajectory, the input end 45 moves along it. Because output end 46 remains at the midpoint of the line connecting mounting end 47 and input end 45, the motion trajectory of output end 46 is similar to that of input end 45, and the amplitude of the trajectory of output end 46 is half that of input end 45, thus converting a large-amplitude elliptical output motion into a small-amplitude elliptical output motion.

[0034] Furthermore, the above-mentioned scaling units 40 are provided with a plurality of them, and the plurality of scaling units 40 are connected in sequence. When connected, the output end 46 of the previous scaling unit 40 is rotatably connected to the input end 45 of the subsequent scaling unit 40, so that the elliptical motion output by the output shaft 34 can be converted into an amplitude as needed. Thus, it can be applied to a variety of environments requiring elliptical motion output without being restricted by the structural size of the adjustment mechanism itself, such as for loading tests of small-sized specimens in three-axis loading tests.

[0035] like Figures 1 to 6 As shown, a simulated three-axis loading test device includes the aforementioned elliptical motion mechanism and universal fixture. Figure 6As shown, the universal fixture includes a chassis 4 and a bidirectional actuating shaft 5. One end of the bidirectional actuating shaft 5 is fixedly connected to the chassis 3, while the other end of the bidirectional actuating shaft 4 is rotatably connected to the output shaft 34 of the aforementioned elliptical motion mechanism or the output end 46 of any scaling unit 40. Consequently, upon activation of the power mechanism 2, the chassis 4 and bidirectional actuating shaft 5 move along an elliptical trajectory. In mathematical theory, according to the Lissajous curve, the composite curve of two mutually perpendicular simple harmonic oscillations of the same frequency is an ellipse. In use, after loading a specimen onto the chassis 3, the elliptical motion of the chassis 3 can simulate two mutually perpendicular, equal-frequency, bidirectional loading conditions. The parameters of this elliptical motion can be adjusted to simulate different bidirectional loading ratios, eliminating the need for two mutually perpendicular actuators to achieve bidirectional loading.

[0036] During specific implementation, the workbench 1 is arranged horizontally, and the chassis 3 is arranged on the top surface of the workbench 1. The elliptical motion trajectory output by the elliptical motion mechanism is in the horizontal plane, which is used to simulate the horizontal two-way loading process; a plurality of balls are rotatably arranged at the bottom of the chassis 3, and the balls are arranged between the chassis 3 and the top surface of the workbench 1, which are used to reduce the influence of friction on the simulated two-way loading process.

[0037] The simulated three-dimensional loading test apparatus also includes a gantry 5 and a vertical actuator 6. The vertical actuator 6 is fixedly mounted on the gantry 5 and arranged vertically. The actuating end of the vertical actuator 6 is fixedly connected to a top plate 7, which is arranged parallel to and above the bottom plate 3. During the three-dimensional loading test, the specimen is clamped between the top plate 7 and the bottom plate 3. The vertical actuator 6 applies a vertical load, and the elliptical motion mechanism outputs an elliptical motion to simulate the horizontal two-dimensional load. In this way, the two prime movers, the vertical actuator 6 and the power mechanism 2, can perform a simulated three-dimensional loading test on the specimen. Compared with the method of individually loading multiple actuators with six degrees of freedom, the simulated three-dimensional loading test is inexpensive and has a simple control scheme.

[0038] The foregoing description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the appended claims.

Claims

1. An elliptical motion mechanism, characterized in that: It includes a workbench, a first adjustment mechanism, a second adjustment mechanism and a third adjustment mechanism, The first adjustment mechanism includes a slider A, a screw rod A, a support A and a pin A. The slider A is rotatably connected to the workbench via the pin A. The screw rod A is rotatably arranged on the support A. The screw rod A and the pin A are perpendicular to each other. The slider A is slidably connected to the support A, and the slider A is threadedly connected to the screw rod A. The second adjustment mechanism includes a support B, a pin B, a screw B and two sliding components. The support B is rotatably connected to the support A through the pin B. The pin B is parallel to the pin A. The screw B is rotatably connected to the support B. The screw B and the pin B are perpendicular to each other. The threads at both ends of the screw B rotate in opposite directions. The sliding assembly includes a slider B, a sliding rod and a rotating pin. The sliding rod is rotatably connected to the slider B through the rotating pin. The rotating pin is parallel to the pin shaft A. The slider B is slidably arranged on the support B. The sliding rod is slidably connected to the workbench. The two rotating pins are symmetrically arranged on both sides of the pin shaft B, and the two sliders B are respectively threadedly connected to the two ends of the screw rod B. The sliding directions of the two sliders are perpendicular to each other, and the intersection of the sliding tracks of the two rotating pins is located on the axis of the pin shaft A. The third adjustment mechanism includes a support C, a slider C, a screw C and an output shaft, wherein the support C is fixedly connected to the support B, the slider C is slidably connected to the support C, the screw C is rotatably arranged on the support C, the slider C is threadedly connected to the screw C, and the output shaft is fixedly mounted on the slider C, the output shaft and the rotating pin are parallel to each other, and the axial projection of the output shaft is located on the line connecting the axial projections of the two rotating pins; The invention also includes a scaling unit, wherein the scaling unit includes a long connecting rod A, a long connecting rod B, a short connecting rod A, and a short connecting rod B. The long connecting rod A and the long connecting rod B have the same length, the short connecting rod A and the short connecting rod B have the same length, and the length of the long connecting rod A is twice the length of the short connecting rod A. One end of the long connecting rod A is rotatably connected to the workbench, the other end of the long connecting rod A is rotatably connected to one end of the long connecting rod B, the other end of the long connecting rod B forms an input end, one end of the short connecting rod A is rotatably connected to the center of the long connecting rod A, one end of the short connecting rod B is rotatably connected to the center of the long connecting rod B, one end of the short connecting rod A away from the long connecting rod A and one end of the short connecting rod B away from the long connecting rod B are rotatably connected and form an output end; The input end is rotatably connected to the output shaft.

2. An elliptical motion mechanism according to claim 1, characterized in that: There are a plurality of scaling units, which are connected in sequence. When connected, the output end of the preceding scaling unit is rotatably connected to the input end of the following scaling unit.

3. An elliptical motion mechanism according to claim 1 or 2, characterized in that: It also includes a power mechanism and an adjustment drive mechanism, the power mechanism is used to drive the slider A to rotate, the adjustment drive mechanism includes a first motor, a second motor and a third motor, the first motor is used to drive the screw rod A to rotate, the second motor is used to drive the screw rod B to rotate, and the third motor is used to drive the screw rod C to rotate.

4. A simulated three-axis loading test device, characterized in that: It includes an elliptical motion mechanism as described in claim 2, and also includes a universal tooling, the universal tooling includes a chassis and a bidirectional actuating shaft, one end of the bidirectional actuating shaft is fixedly connected to the chassis, and the other end of the bidirectional actuating shaft is rotatably connected to the output shaft or the output end of any one of the scaling units.

5. A simulated three-axis loading test device according to claim 4, characterized in that: The workbench is arranged horizontally, the pin shaft A is arranged vertically, the chassis is arranged on the top surface of the workbench, and a plurality of balls are rotatably arranged on the bottom of the chassis, and the balls are arranged between the chassis and the top surface of the workbench.

6. The simulated three-axis loading test device according to claim 5, characterized in that: It also includes a gantry and a vertical actuator, wherein the vertical actuator is fixedly mounted on the gantry, the vertical actuator is vertically arranged, the actuating end of the vertical actuator is fixedly connected to a top plate, and the top plate is arranged parallel to and above the bottom plate.

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