Elliptic motion mechanism and simulated three-way loading test device

Abstract

The invention relates to the technical field of elastic rubber detection, and discloses an elliptical motion mechanism and a simulated three-way loading test device.The elliptical motion mechanism comprises a workbench, a first adjusting mechanism, a second adjusting mechanism and a third adjusting mechanism are arranged in the workbench, and the first adjusting mechanism comprises a sliding block A, a lead screw A, a support A and a pin shaft A; the second adjusting mechanism comprises a support B, a pin shaft B, a lead screw B and two sliding assemblies, each sliding assembly comprises a sliding block B, a sliding rod and a rotating pin, the third adjusting mechanism comprises a support C, a sliding block C, a lead screw C and an output shaft, when power is input to enable the pin shaft A and the sliding block A to rotate, the third adjusting mechanism can output motion in an elliptical track on the output shaft, and meanwhile parameters of the output elliptical track can be adjusted; the three-way loading test device comprises the elliptical motion mechanism and the vertical actuator, the three-way loading condition can be simulated only through two driving links, the manufacturing cost is relatively low, and the control scheme is simple.

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 the field of new energy vehicles, rubber bushings in the suspension system, motor suspension rubber bushings, battery pack fixing rubber bushings, etc. all need elastic rubber; in the field of rail transit, EMU vehicles also widely use rubber elastic elements such as a series of steel spring rubber pads, shock absorber rubber nodes, and air springs. In the process of testing the performance of elastic rubber components, we generally focus on the stiffness, damping and other properties of rubber components under static conditions. However, in actual applications, due to the multiple coupled movements of the vehicle body, the elastic rubber components will be subjected to three-dimensional forces and three-dimensional displacements. In order to ensure the reliability and durability of elastic rubber components under complex stress conditions, it is necessary to test their mechanical behavior and change laws during the three-dimensional loading process. Therefore, a three-dimensional loading test platform for testing elastic rubber is urgently needed. At present, most of the three-dimensional loading test platforms on the market are mainly based on the three-dimensional rock and soil forces studied in geotechnical mechanics. They mainly use multiple actuators to simulate six-degree-of-freedom motion. They are expensive, and each actuator needs to be controlled separately during the test, and the control scheme is relatively complicated. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an elliptical motion mechanism and a simulated three-dimensional loading test device. The elliptical motion mechanism can realize the output of 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 two-way loading conditions. The three-way loading experimental device formed by matching with a vertical actuator only needs two prime movers to simulate the three-way loading test, the cost is relatively low, and the control scheme is simple.

[0004] The objective of the present invention is achieved through the following technical solutions: An elliptical motion mechanism comprises a workbench, a first adjustment mechanism, a second adjustment mechanism and a third adjustment mechanism, wherein the first adjustment mechanism comprises a slider A, a screw rod A, a support A and a pin A, wherein the slider A is rotatably connected to the workbench via the pin A, the screw rod A is rotatably arranged 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 comprises a support B, a pin B, a screw rod B and two sliding assemblies, wherein the support B is rotatably connected to the support A via 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, and the threads at both ends of the screw rod B have opposite rotation directions, and the sliding assembly comprises a slider B, a slide rod and a swivel pin, wherein the slide rod is connected to the slider B via the swivel pin The rotating pin is parallel to the pin shaft A, the slider B is slidably arranged on the support B, the slide bar is slidably connected to the workbench, the two rotating pins are symmetrically arranged on both sides of the pin shaft B, the two sliders B are respectively threadedly connected to the two ends of the screw rod B, the sliding directions of the two slide rods 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 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 arranged on the support C, the slider C is threadedly connected to the screw rod C, the output shaft is fixedly installed on the slider C, the output shaft is parallel to the rotating pin, and the axial projection of the output shaft is located on the connecting line of the axial projections of the two rotating pins. When the driving pin shaft A and the slider A rotate, the output shaft can be output according to the elliptical trajectory, and the parameters of the output elliptical trajectory can be adjusted by the first adjustment mechanism, the second adjustment mechanism and the third adjustment mechanism.

[0005] Furthermore, it also includes a scaling unit, which 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, and 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, and 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 to form an output end; the input end is rotatably connected to the output shaft.

[0006] Furthermore, there are a plurality of scaling units, and the scaling units are connected in sequence, and when connected, the output end of the preceding scaling unit is rotatably connected to the input end of the succeeding scaling unit.

[0007] 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 for simulating bidirectional loading tests.

[0008] 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.

[0009] A simulated three-way 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.

[0010] Specifically, the workbench is horizontally arranged, the pin shaft A is vertically arranged, the chassis is arranged on the top surface of the workbench, a plurality of balls are rotatably arranged at the bottom of the chassis, and the balls are arranged between the chassis and the top surface of the workbench.

[0011] Furthermore, 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.

[0012] During the test, the simulated three-dimensional loading test device can apply a vertical load through a vertical actuator, and can simulate horizontal two-dimensional loads through an elliptical motion mechanism, thereby simulating and completing a three-dimensional loading test as a whole.

[0013] The beneficial effects of the present invention are: 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 the screw rod A can drive the support A and the slider A to slide relative to each other when it rotates; 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, the slide rod is connected to the slide through the rotating pin Block B is rotatably connected, the slide bar is slidably connected with the workbench, the sliding tracks of the two rotating pins are perpendicular to each other and the intersection is located on the axis of the pin shaft A, the two rotating pins can be moved closer or farther away from each other when the screw rod B rotates, and the two rotating pins are symmetrically arranged on both sides of the pin shaft B; the third adjustment mechanism includes a support C, a slider C, a screw rod C and an output shaft, the support C is fixedly connected with the support B, the slider C and the support C can slide relative to each other when the screw rod C is rotated, the output shaft is fixedly installed on the slider C, the pin shaft A, the pin shaft B, the rotating pin and the output shaft are parallel to each other, and the axial projection of the output shaft is located on the connecting line of the axial projections of the two rotating pins. When the elliptical motion mechanism is used, when the distance between the axis projection of the pin shaft A and the axis projection of the pin shaft B and the distance between the axis projection of the pin shaft B and the axis projection of the two rotating pins are equal, the input power causes the pin shaft A and the slider A to rotate, and the movement of the elliptical track can be output on the output shaft, and the parameters of the output elliptical track can also be adjusted through the above-mentioned first adjustment mechanism, the second adjustment mechanism and the third adjustment mechanism.

[0014] 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 a horizontal plane. The vertical actuator is used to complete the vertical loading, so only two prime movers are needed 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

[0015] Figure 1 It is a structural schematic diagram of a simulated three-way loading test device of the present invention; Figure 2 It is a schematic diagram of the internal structure of an elliptical motion mechanism of the present invention; Figure 3 for Figure 2 The schematic diagram of the structure of the elliptical motion mechanism shown in the figure after removing the workbench; Figure 4 for Figure 2 A schematic diagram of the structure of the adjusting device in the elliptical motion mechanism shown; Figure 5 for Figure 2 The structural schematic diagram of the scaling unit in the elliptical motion mechanism shown; Figure 6 It is a structural schematic diagram of a vertical actuator and a chassis in a simulated three-way loading test device of the present invention; Figure 7 for Figure 4 The schematic diagram of the regulating device shown; 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

[0016] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0017] 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 .

[0018] like Figure 4 As shown, the first adjustment mechanism 10 includes a slider A11, a screw rod A12, a support A13 and a pin A (not shown). The slider A11 is rotatably connected to the workbench 1 through the pin A; the screw rod A12 is rotatably set on the support A13, and the screw rod A12 and the pin A are perpendicular to each other; the slider A11 is slidably connected to the support A13, and the slider A11 is threadedly connected to the screw rod A12, which constitutes a screw nut mechanism. When the screw rod A12 rotates, the slider A11 can be driven to slide, so that the position of the slider A11 on the support A13 can be adjusted by rotating the screw rod A11. Since the slider A11 is rotatably connected to the workbench 1 through the pin A, when the screw rod A11 is rotated, the distance between any point on the support A13 and the pin A is adjusted.

[0019] The second adjustment mechanism 20 includes a support B21, a pin B (not shown), a screw B22 and two sliding assemblies. The support B21 is rotatably connected to the support A13 via the pin B, and the pin B is parallel to the pin A; the screw B22 is rotatably connected to the support B21, and the screw B22 and the pin B are perpendicular to each other. The above-mentioned sliding assembly includes a slider B23, a slide rod 24 and a rotating pin (not shown). The slide rod 24 is rotatably connected to the slider B23 via the rotating pin, and the rotating pin is also parallel to the pin A and the pin B. The slider B23 is slidably arranged on the support B21. The screw rod B22 is a double-ended screw rod with opposite threads at both ends. Two rotating pins are symmetrically arranged on both sides of the pin shaft B, that is, the distances between the two rotating pins and the pin shaft B are equal; two sliders B23 are respectively connected with the two ends of the screw rod B22 by threads, which is a screw nut mechanism. When the screw rod 22 is rotated, the two sliders B move synchronously toward or away from each other, so that the distances between the two rotating pins and the pin shaft B can be synchronously adjusted by rotating the screw rod 22. The slide rod 24 is slidably connected to the workbench 1, and the sliding directions of the two slide rods 24 are perpendicular to each other. The intersection of the sliding tracks of the two rotating pins is located on the axis of the pin shaft A.

[0020] 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 arranged on the support C31. The slider C32 is threadedly connected to the screw C33, which constitutes a screw nut mechanism. When the screw C33 is rotated, the slider C32 can be driven to slide on the support C31. The support C31 is fixedly connected to the support B21, and the output shaft 34 is fixedly installed 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.

[0021] 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 along 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 distances 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, point C and point D are the projections of the two rotating pin axes, point M is the projection of the axis of pin B, point N is the projection of the axis of output shaft C, and the x-axis and y-axis are the moving trajectories of the two rotating pin axis projections. When the length relationship of 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 (including point N) on the CD line except point M 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.

[0022] In the 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 adjusting the screw rod A11 and the screw rod B22 in coordination 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 axial projection line 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 parameter adjustment of the elliptical trajectory output by output shaft 34 can be achieved by rotating screw A11, screw B22, and screw C33.

[0023] In specific implementation, the elliptical motion mechanism also includes a power mechanism 2 and an adjustment drive mechanism. The power mechanism 2 can select 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 shaft A, and the pin shaft 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 shaft 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.

[0024] Furthermore, the elliptical motion mechanism also 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 have the same length, the short link A43 and the short link B44 have the same length, and 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, and one end of the short link A43 away from the long link A41 and one 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 size relationship and the design of the connection structure, as Figure 5 As shown, after the connection, no matter how the angle between the long connecting rod A41 and the long connecting rod B42 changes, the output end 46 is always located at the midpoint of the line connecting the mounting end 47 and the input end 45. When the zoom unit 40 is in use, the mounting end 47 is rotatably connected to the workbench 1, and the input end 45 is rotatably connected to the output shaft 34. When the output shaft 34 outputs motion according to an elliptical trajectory, the input end 45 moves along with it. Since the output end 46 is always located at the midpoint of the line connecting the mounting end 47 and the input end 45, the motion trajectory of the output end 46 is similar to that of the input end 45, and the trajectory amplitude of the output end 46 is half of that of the input end 45, which can convert a large-amplitude elliptical output motion into a small-amplitude elliptical output motion.

[0025] 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 amplitude of the elliptical motion output by the output shaft 34 can be converted 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-way loading tests.

[0026] like Figures 1 to 6 As shown, a simulated three-dimensional 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, and the other end of the bidirectional actuating shaft 4 is rotatably connected to the output shaft 34 in the aforementioned elliptical motion mechanism or the output end 46 of any scaling unit 40, so that after the power mechanism 2 is started, the chassis 4 and the bidirectional actuating shaft 5 move according to the elliptical motion trajectory. In mathematical theory, according to the Lissajous curve, the synthetic curve of two mutually perpendicular simple harmonic vibrations of the same frequency is an ellipse; when the test device is used, after the sample is loaded on the chassis 3, the elliptical motion of the chassis 3 can be used to simulate two mutually perpendicular two-way loading situations of the same frequency, and the parameters of the elliptical motion can be adjusted to simulate different two-way loading ratios, so that there is no need to set two mutually perpendicular actuators to complete the two-way loading.

[0027] During the specific implementation, the workbench 1 is horizontally arranged, 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, so as to reduce the influence of friction on the simulated two-way loading process.

[0028] The simulated three-dimensional loading test device also includes a gantry 5 and a vertical actuator 6. The vertical actuator 6 is fixedly mounted on the gantry 5. The vertical actuator 6 is vertically arranged. The actuating end of the vertical actuator 6 is fixedly connected to a top plate 7. The top plate 7 is arranged parallel to the top of the bottom plate 3. When performing the three-dimensional loading test, the sample is clamped between the top plate 7 and the bottom plate 3, and the vertical actuator 6 is used to apply a vertical load. The elliptical motion mechanism outputs an elliptical motion to simulate the horizontal two-dimensional load. Thus, the two prime movers, the vertical actuator 6 and the power mechanism 2, can perform a simulated three-dimensional loading test on the sample. Compared with the form of loading six-degree-of-freedom multi-actuators separately, the cost is low and the control scheme is simple.

[0029] The above is only 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 regarded as excluding other embodiments, but 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 the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

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 through 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. 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 slide rod and a rotating pin. The slide 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 slide rod is slidably connected to the workbench. The two rotating pins are symmetrically arranged on both sides of the pin shaft B, the two sliding blocks B are respectively threadedly connected to the two ends of the screw rod B, the sliding directions of the two sliding rods 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 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 arranged on the support C, the slider C is threadedly connected to the screw rod C, the output shaft is fixedly installed on the slider C, the output shaft is parallel to the rotating pin, and the axial projection of the output shaft is located on the connecting line of the axial projections of the two rotating pins.

2. An elliptical motion mechanism according to claim 1, characterized in that: It also includes a scaling unit, 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 to form an output end; The input end is rotatably connected to the output shaft.

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

4. An elliptical motion mechanism according to any one of claims 1 to 3, 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 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.

5. A simulated three-way loading test device, characterized in that: It includes an elliptical motion mechanism as described in claim 3, 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.

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

7. A simulated three-axis loading test device according to claim 6, 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, an 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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