Structural fatigue test device based on loading actuator

Abstract

The invention provides a loading actuator-based structural fatigue test device, which comprises a base, a plurality of support columns are vertically and fixedly connected to the upper surface of the base, a support plate is fixedly connected to the upper parts of the surfaces of the support columns, and an MTS actuator body is vertically and fixedly connected to the upper surface of the support plate. The bottom end of the MTS actuator body extends to the position below the supporting plate in a drawing mode and is fixedly connected with a moving box. According to the structural fatigue test device based on the loading actuator, after the two first inner supporting blocks are embedded into the top end of the automobile elastic component structure, the two first inner supporting blocks can be driven to be away from each other after the first transmission mechanism works, and after the top end of the automobile elastic component structure is internally supported and fixed through the first inner supporting blocks, the structural fatigue test is completed. The telescopic deformation fatigue test can be carried out on the automobile elastic component structure through the telescopic movement of the MTS actuator body.

Description

Technical Field

[0001] The invention relates to the technical field of fatigue testing, and in particular to a structural fatigue testing device based on a loading actuator. Background Art

[0002] MTS actuator is a physical property testing instrument widely used in multiple engineering fields, especially in civil engineering, water conservancy engineering, transportation engineering and other fields. There are many types of MTS actuators, among which electro-hydraulic servo actuator is a more common one. This actuator is mainly used for static and dynamic tests of large bridges and building structures or components, earthquake response pseudo-dynamic tests, etc. It adopts an electro-hydraulic servo closed-loop control structure and consists of multiple systems, including digital control systems, loading test systems and data analysis and processing systems. These systems work together to achieve precise control of the test object and data collection.

[0003] In the prior art, during the production and processing of automobile elastic component structures, it is necessary to use MTS actuators to perform fatigue detection tests on the elastic component structures. However, the existing structural fatigue testing devices based on loading actuators can only squeeze the automobile elastic component structures up and down during use, and the detection test effect on the automobile elastic component structures is poor, which is not conducive to the production and processing of automobile elastic component structures.

[0004] Therefore, it is necessary to provide a new structural fatigue testing device based on a loading actuator to solve the above technical problems. Summary of the invention

[0005] The invention provides a structural fatigue test device based on a loading actuator, and solves the technical problem that the existing structural fatigue test device based on a loading actuator can only press the elastic component structure of an automobile up and down during use, and the detection test effect is poor.

[0006] In order to solve the above technical problems, the present invention provides a structural fatigue test device based on a loading actuator, comprising a base, a plurality of support columns are vertically fixedly connected to the upper surface of the base, a support plate is fixedly connected to the upper part of the surface of the support column, an MTS actuator body is vertically fixedly connected to the upper surface of the support plate, the bottom end of the MTS actuator body is pulled out and extended to the bottom of the support plate, and is fixedly connected to a moving box, and both ends of the bottom of the moving box are provided with a first inner support block that moves in the horizontal direction through a first transmission mechanism;

[0007] A fixed box is slidably provided on the top of the base, and both ends of the top of the fixed box are provided with second inner support blocks that move in the horizontal direction through a second transmission mechanism;

[0008] The other end of the base is horizontally connected to a connecting pipe, and the other end of the connecting pipe is vertically connected to a transmission box. The inner cavity of the base is rotatably connected to a transmission threaded rod, and the surface of the transmission threaded rod is threadedly connected to a transmission threaded sleeve, and the top of the transmission threaded sleeve is vertically fixedly connected to a vertical rod, and the top of the vertical rod movably extends to the outside of the base and is fixedly connected to the bottom of the fixed box, and the inner cavity of the transmission box is provided with a driving structure for driving the transmission threaded rod to rotate.

[0009] Preferably, the first transmission mechanism includes a first shell, a first bidirectional threaded rod and a first motor, the first shell is fixedly connected to one end of the moving box, the first motor is fixedly connected to the inside of the first shell, the first bidirectional threaded rod is rotatably connected to the inner cavity of the moving box, one end of the first bidirectional threaded rod extends to the inner cavity of the first shell and is fixedly connected to the output shaft of the first motor, both ends of the surface of the first bidirectional threaded rod are threadedly connected to the first threaded sleeve, the bottom of the first threaded sleeve is fixedly connected to the first connecting rod, the top of the first inner support block movably extends to the inner cavity of the moving box and is fixedly connected to the surface of the first connecting rod at the same end.

[0010] Preferably, a first movable opening is transversely opened at the bottom of the moving box, and the top end of the first inner support block extends through the first movable opening to the inner cavity of the moving box.

[0011] Preferably, the second transmission mechanism includes a second shell, a second motor and a second bidirectional threaded rod, the second shell is fixedly connected to one end of the fixed box, the second motor is fixedly connected to the inside of the second shell, the second bidirectional threaded rod is rotatably connected to the inner cavity of the fixed box, one end of the second bidirectional threaded rod extends to the inner cavity of the second shell and is fixedly connected to the output shaft of the second motor, both ends of the surface of the second bidirectional threaded rod are threadedly connected with a second threaded sleeve, the top of the second threaded sleeve is fixedly connected with a second connecting rod, and the bottom end of the second inner support block movably extends to the inside of the fixed box and is fixedly connected to the surface of the second connecting rod at the same end.

[0012] Preferably, a second movable opening is transversely opened on the top of the fixed box, and the bottom end of the second inner support block extends to the inner cavity of the fixed box through the inside of the second movable opening.

[0013] Preferably, both ends of the bottom of the fixed box are fixedly connected with sliding blocks, and both ends of the top of the base are provided with sliding grooves adapted to the sliding blocks.

[0014] Preferably, the driving structure includes a linkage box and a transmission rod, the linkage box is fixedly connected to the bottom of the other side of the transmission box, the transmission rod is rotatably connected to the inner cavity of the linkage box, one end of the transmission rod sequentially passes through the interior of the transmission box and the connecting pipe, and rotates to extend to the inner cavity of the base, one end of the transmission rod is fixedly connected to a first bevel gear, and the front end of the surface of the transmission threaded rod is fixedly connected to a second bevel gear meshing with the first bevel gear, and the inner cavity of the transmission box is provided with a linkage structure for driving the transmission rod to rotate reciprocally.

[0015] Preferably, the linkage structure includes an L-shaped rod, a rack plate and a cross rod, the L-shaped rod is fixedly connected to the other end of the mobile box, the other end of the L-shaped rod movably extends to the inner cavity of the transmission box, the cross rod is rotatably connected to the top of the inner cavity of the linkage box, the rack plate is vertically fixedly connected to the bottom end of the L-shaped rod, one end of the cross rod is rotatably extended to the inner cavity of the transmission box, and is fixedly connected to a transmission gear meshing with the rack plate, the other end of the cross rod and the other end of the transmission rod are both fixedly connected to pulleys, and the two pulleys are connected by belt transmission.

[0016] Preferably, a second movable opening is vertically opened on the upper portion of one side of the transmission box, and the other end of the L-shaped rod extends through the interior of the second movable opening to the inner cavity of the transmission box.

[0017] Compared with the related art, the structural fatigue testing device based on the loading actuator provided by the present invention has the following beneficial effects:

[0018] The present invention provides a structural fatigue testing device based on a loading actuator. After a worker places the automobile elastic component structure on the top of a fixed box, the second transmission mechanism can be operated to drive two second inner support blocks to move relative to each other. After the second inner support blocks come into contact with the inner wall surface of the automobile elastic component structure, the bottom end of the automobile elastic component structure can be internally supported and fixed. Then, after the MTS actuator body is extended, the moving box is driven to descend. After the two first inner support blocks are embedded in the top end of the automobile elastic component structure, the first transmission mechanism can be operated to drive the two first inner support blocks to move away from each other. The automobile elastic component structure can be fixed by the first inner support blocks. After the top inner support of the structure is fixed, it can be telescopically moved through the MTS actuator body, and the telescopic deformation fatigue test of the automobile elastic component structure can be carried out. After being driven by the linkage structure and the driving structure, the transmission threaded rod can be driven to rotate back and forth, and then the connection between the transmission threaded sleeve and the vertical rod is used to drive the fixed box to move back and forth, and the lateral deformation stiffness fatigue test of the automobile elastic component structure is carried out. The fatigue test effect of the automobile elastic component structure is better, which is beneficial to the production, processing and use of the automobile elastic component structure. The spacing can be adjusted by the second inner support block and the first inner support block, so that the automobile elastic component structure of different specifications can be adapted for testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a preferred embodiment of a structural fatigue testing device based on a loading actuator provided by the present invention;

[0020] Figure 2 for Figure 1 The schematic diagram of the structure of the front cross-section shown;

[0021] Figure 3 for Figure 1 The structural diagram of the base and the transmission threaded rod shown;

[0022] Figure 4 for Figure 1 A schematic structural diagram of the second transmission mechanism shown;

[0023] Figure 5 for Figure 1 A structural schematic diagram of the linkage structure shown;

[0024] Figure 6 for Figure 1 The structural schematic diagram of the first transmission mechanism is shown in FIG.

[0025] Numbers in the figure: 1, base; 2, support plate; 3, MTS actuator body; 4, moving box; 5, first shell; 6, first motor; 7, first bidirectional threaded rod; 8, linkage box; 9, first threaded sleeve; 10, first connecting rod; 11, first inner support block; 12, first movable opening; 13, support column; 14, transmission box; 15, second movable opening; 16, L-shaped rod; 17, rack plate; 18, transmission gear; 19, cross bar; 20, connecting pipe; 21, transmission rod; 22, pulley; 23, first bevel gear; 24, transmission threaded rod; 25, second bevel gear; 26, transmission threaded sleeve; 27, vertical rod; 28, fixed box; 29, second bidirectional threaded rod; 30, second threaded sleeve; 31, second shell; 32, second motor; 33, second connecting rod; 34, second inner support block; 35, second movable opening. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0027] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 ,in, Figure 1 A schematic structural diagram of a preferred embodiment of a structural fatigue testing device based on a loading actuator provided by the present invention;

[0028] Figure 2 for Figure 1 The schematic diagram of the structure of the front cross-section shown; Figure 3 for Figure 1 The structural diagram of the base and the transmission threaded rod shown; Figure 4 for Figure 1 A schematic structural diagram of the second transmission mechanism shown; Figure 5 for Figure 1 A structural schematic diagram of the linkage structure shown; Figure 6 for Figure 1 The structural diagram of the first transmission mechanism is shown in FIG. The structural fatigue test device based on the loading actuator comprises a base 1, a plurality of support columns 13 are vertically fixedly connected to the upper surface of the base 1, a support plate 2 is fixedly connected to the upper part of the surface of the support column 13, and an MTS actuator body 3 is vertically fixedly connected to the upper surface of the support plate 2.

[0029] The bottom end of the MTS actuator body 3 is pulled out and extended to the bottom of the support plate 2, and is fixedly connected to a moving box 4. Both ends of the bottom of the moving box 4 are provided with first inner support blocks 11 that move in the horizontal direction through a first transmission mechanism.

[0030] A fixed box 28 is slidably disposed on the top of the base 1 , and second inner support blocks 34 that move in the horizontal direction are disposed at both ends of the top of the fixed box 28 through a second transmission mechanism.

[0031] The other end of the base 1 is laterally connected to a connecting pipe 20, and the other end of the connecting pipe 20 is vertically connected to a transmission box 14. The inner cavity of the base 1 is rotatably connected to a transmission threaded rod 24, and the surface of the transmission threaded rod 24 is threadedly connected to a transmission threaded sleeve 26, and the top of the transmission threaded sleeve 26 is vertically fixedly connected to a vertical rod 27.

[0032] The top end of the vertical rod 27 movably extends to the outside of the base 1 and is fixedly connected to the bottom of the fixed box 28 . The inner cavity of the transmission box 14 is provided with a driving structure for driving the transmission threaded rod 24 to rotate.

[0033] After the staff places the automobile elastic component structure on the top of the fixing box 28, the second transmission mechanism can be operated to drive the two second inner support blocks 34 to move relative to each other. After the second inner support blocks 34 come into contact with the inner wall surface of the automobile elastic component structure, the bottom end of the automobile elastic component structure can be internally supported and fixed.

[0034] After the MTS actuator body 3 is extended, it drives the moving box 4 to descend. After the two first inner support blocks 11 are embedded in the top interior of the automobile elastic component structure, the first transmission mechanism can be operated to drive the two first inner support blocks 11 to move away from each other. After the top inner support of the automobile elastic component structure is fixed by the first inner support blocks 11, the MTS actuator body 3 can be telescopically moved to perform a telescopic deformation fatigue test on the automobile elastic component structure.

[0035] After the linkage structure and the driving structure are driven, the transmission threaded rod 24 can be driven to rotate back and forth, and then the connection between the transmission threaded sleeve 26 and the vertical rod 27 is utilized to drive the fixed box 28 to move back and forth, so as to perform lateral deformation stiffness fatigue test on the elastic component structure of the automobile, and the fatigue test effect on the elastic component structure of the automobile is better.

[0036] It is beneficial to the production, processing and use of automobile elastic component structures, and the spacing between the second inner support block 34 and the first inner support block 11 can be adjusted, so that automobile elastic component structures of different specifications can be adapted for testing.

[0037] The first transmission mechanism includes a first shell 5, a first bidirectional threaded rod 7 and a first motor 6. The first shell 5 is fixedly connected to one end of the moving box 4, the first motor 6 is fixedly connected to the inside of the first shell 5, the first bidirectional threaded rod 7 is rotatably connected to the inner cavity of the moving box 4, one end of the first bidirectional threaded rod 7 extends to the inner cavity of the first shell 5, and is fixedly connected to the output shaft of the first motor 6, both ends of the surface of the first bidirectional threaded rod 7 are threadedly connected with the first threaded sleeve 9, the bottom of the first threaded sleeve 9 is fixedly connected with the first connecting rod 10, the top of the first inner support block 11 movably extends to the inner cavity of the moving box 4, and is fixedly connected to the surface of the first connecting rod 10 at the same end.

[0038] After the first motor 6 drives the first bidirectional threaded rod 7 to rotate, the two first threaded sleeves 9 can be driven to move closer to or away from each other. The distance between the two first inner support blocks 11 can be adjusted by connecting the first connecting rod 10 .

[0039] A first movable opening 12 is transversely opened at the bottom of the moving box 4 , and the top end of the first inner support block 11 extends through the first movable opening 12 to the inner cavity of the moving box 4 .

[0040] The second transmission mechanism includes a second shell 31, a second motor 32 and a second bidirectional threaded rod 29. The second shell 31 is fixedly connected to one end of the fixed box 28, the second motor 32 is fixedly connected to the inside of the second shell 31, the second bidirectional threaded rod 29 is rotatably connected to the inner cavity of the fixed box 28, one end of the second bidirectional threaded rod 29 extends to the inner cavity of the second shell 31 and is fixedly connected to the output shaft of the second motor 32, both ends of the surface of the second bidirectional threaded rod 29 are threadedly connected with a second threaded sleeve 30, the top of the second threaded sleeve 30 is fixedly connected with a second connecting rod 33, and the bottom end of the second inner support block 34 movably extends to the inside of the fixed box 28 and is fixedly connected to the surface of the second connecting rod 33 at the same end.

[0041] After the second motor 32 drives the second bidirectional threaded rod 29 to rotate, the two second threaded sleeves 30 can be driven to move closer to or farther from each other. The distance between the two second inner support blocks 34 can be adjusted by connecting the second connecting rod 33 .

[0042] A third movable opening 35 is transversely opened at the top of the fixed box 28 , and the bottom end of the second inner support block 34 extends through the third movable opening 35 to the inner cavity of the fixed box 28 .

[0043] Both ends of the bottom of the fixed box 28 are fixedly connected with sliding blocks, and both ends of the top of the base 1 are provided with sliding grooves adapted to the sliding blocks.

[0044] The driving structure includes a linkage box 8 and a transmission rod 21. The linkage box 8 is fixedly connected to the bottom of the other side of the transmission box 14. The transmission rod 21 is rotatably connected to the inner cavity of the linkage box 8. One end of the transmission rod 21 passes through the interior of the transmission box 14 and the connecting pipe 20 in sequence, and rotates to extend to the inner cavity of the base 1. One end of the transmission rod 21 is fixedly connected to a first bevel gear 23, and the front end of the surface of the transmission threaded rod 24 is fixedly connected to a second bevel gear 25 meshing with the first bevel gear 23. The inner cavity of the transmission box 14 is provided with a linkage structure that drives the transmission rod 21 to rotate reciprocally.

[0045] The linkage structure includes an L-shaped rod 16, a rack plate 17 and a cross bar 19. The L-shaped rod 16 is fixedly connected to the other end of the mobile box 4, and the other end of the L-shaped rod 16 is movably extended to the inner cavity of the transmission box 14. The cross bar 19 is rotatably connected to the top of the inner cavity of the linkage box 8. The rack plate 17 is vertically fixedly connected to the bottom end of the L-shaped rod 16. One end of the cross bar 19 is rotatably extended to the inner cavity of the transmission box 14 and is fixedly connected to a transmission gear 18 meshing with the rack plate 17. The other end of the cross bar 19 and the other end of the transmission rod 21 are fixedly connected to pulleys 22, and the two pulleys 22 are connected by belt transmission.

[0046] When the support plate 2 drives the moving box 4 to telescopically move, the rack plate 17 can be driven to move up and down through the connection of the L-shaped rod 16. After the transmission gear 18 rotates back and forth, the transmission rod 21 can be driven to move back and forth by utilizing the transmission of the two cross bars 19. Then, the transmission threaded rod 24 can be driven to move back and forth through the transmission of the first bevel gear 23 and the second bevel gear 25.

[0047] A second movable opening 15 is vertically opened at the upper portion of one side of the transmission box 14 , and the other end of the L-shaped rod 16 extends through the second movable opening 15 to the inner cavity of the transmission box 14 .

[0048] The working principle of the structural fatigue testing device based on the loading actuator provided by the present invention is as follows:

[0049] After placing the automobile elastic component structure on the top of the fixed box 28, the second transmission mechanism can be operated to drive the two second inner support blocks 34 to move relative to each other. After the second inner support blocks 34 come into contact with the inner wall surface of the automobile elastic component structure, the bottom end of the automobile elastic component structure can be internally supported and fixed. Then, the MTS actuator body 3 is extended to drive the movable box 4 to descend. After the two first inner support blocks 11 are embedded in the top end of the automobile elastic component structure, the first transmission mechanism can be operated to drive the two first inner support blocks 11 to move away from each other. After the top end of the automobile elastic component structure is internally supported and fixed by the first inner support blocks 11, the MTS actuator body 3 can be telescopically moved to perform a telescopic deformation fatigue test on the automobile elastic component structure. Then, after being driven by the linkage structure and the driving structure, the transmission threaded rod 24 can be driven to rotate back and forth. Then, the connection between the transmission threaded sleeve 26 and the vertical rod 27 can be used to drive the fixed box 28 to move back and forth, and the lateral deformation stiffness fatigue test on the automobile elastic component structure can be performed.

[0050] Compared with the related art, the structural fatigue testing device based on the loading actuator provided by the present invention has the following beneficial effects:

[0051] The present invention provides a structural fatigue testing device based on a loading actuator. After the staff places the automobile elastic component structure on the top of the fixed box 28, the second transmission mechanism can be operated to drive the two second inner support blocks 34 to move relative to each other. After the second inner support blocks 34 come into contact with the inner wall surface of the automobile elastic component structure, the bottom end of the automobile elastic component structure can be internally supported and fixed. Then, after the MTS actuator body 3 is extended, the moving box 4 is driven to descend. After the two first inner support blocks 11 are embedded in the top end of the automobile elastic component structure, the first transmission mechanism can be operated to drive the two first inner support blocks 11 to move away from each other. The first inner support blocks 11 can contact the automobile elastic component structure. After the top inner support of the component structure is fixed, it can be telescopically moved through the MTS actuator body 3, and the telescopic deformation fatigue test of the automobile elastic component structure can be carried out. After being driven by the linkage structure and the driving structure, the transmission threaded rod 24 can be driven to rotate back and forth, and then the connection between the transmission threaded sleeve 26 and the vertical rod 27 is used to drive the fixed box 28 to move back and forth, and the lateral deformation stiffness fatigue test of the automobile elastic component structure is carried out. The fatigue test effect of the automobile elastic component structure is better, which is beneficial to the production, processing and use of the automobile elastic component structure. The spacing can be adjusted by the second inner support block 34 and the first inner support block 11, so that it can adapt to automobile elastic component structures of different specifications for testing.

[0052] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A structural fatigue testing device based on a loading actuator, comprising a base (1), characterized in that: The upper surface of the base (1) is vertically fixedly connected with a plurality of support columns (13), the upper part of the surface of the support column (13) is fixedly connected with a support plate (2), the upper surface of the support plate (2) is vertically fixedly connected with an MTS actuator body (3), the bottom end of the MTS actuator body (3) is pulled out and extended to the bottom of the support plate (2), and is fixedly connected with a moving box (4), and both ends of the bottom of the moving box (4) are provided with a first inner support block (11) that moves in a horizontal direction through a first transmission mechanism; A fixed box (28) is slidably provided on the top of the base (1), and second inner support blocks (34) movable in the horizontal direction are provided at both ends of the top of the fixed box (28) via a second transmission mechanism; The other end of the base (1) is laterally connected to a connecting pipe (20), and the other end of the connecting pipe (20) is vertically connected to a transmission box (14). The inner cavity of the base (1) is rotatably connected to a transmission threaded rod (24), and the surface of the transmission threaded rod (24) is threadedly connected to a transmission threaded sleeve (26). The top of the transmission threaded sleeve (26) is vertically fixedly connected to a vertical rod (27). The top of the vertical rod (27) movably extends to the outside of the base (1) and is fixedly connected to the bottom of the fixed box (28). The inner cavity of the transmission box (14) is provided with a driving structure for driving the transmission threaded rod (24) to rotate.

2. The structural fatigue testing device based on the loading actuator according to claim 1 is characterized in that: The first transmission mechanism comprises a first housing (5), a first bidirectional threaded rod (7) and a first motor (6); the first housing (5) is fixedly connected to one end of the moving box (4); the first motor (6) is fixedly connected to the inside of the first housing (5); the first bidirectional threaded rod (7) is rotatably connected to the inner cavity of the moving box (4); one end of the first bidirectional threaded rod (7) extends to the inner cavity of the first housing (5) and is fixedly connected to the output shaft of the first motor (6); both ends of the surface of the first bidirectional threaded rod (7) are threadedly connected to a first threaded sleeve (9); the bottom of the first threaded sleeve (9) is fixedly connected to a first connecting rod (10); the top of the first inner support block (11) movably extends to the inner cavity of the moving box (4) and is fixedly connected to the surface of the first connecting rod (10) at the same end.

3. The structural fatigue testing device based on the loading actuator according to claim 2 is characterized in that: A first movable opening (12) is transversely opened at the bottom of the moving box (4), and the top end of the first inner support block (11) extends through the inside of the first movable opening (12) to the inner cavity of the moving box (4).

4. The structural fatigue testing device based on a loading actuator according to claim 1 is characterized in that: The second transmission mechanism comprises a second housing (31), a second motor (32) and a second bidirectional threaded rod (29); the second housing (31) is fixedly connected to one end of the fixed box (28); the second motor (32) is fixedly connected to the interior of the second housing (31); the second bidirectional threaded rod (29) is rotatably connected to the inner cavity of the fixed box (28); one end of the second bidirectional threaded rod (29) extends to the inner cavity of the second housing (31) and is fixedly connected to the output shaft of the second motor (32); both ends of the surface of the second bidirectional threaded rod (29) are threadedly connected to second threaded sleeves (30); the top of the second threaded sleeve (30) is fixedly connected to a second connecting rod (33); the bottom end of the second inner support block (34) movably extends to the interior of the fixed box (28) and is fixedly connected to the surface of the second connecting rod (33) at the same end.

5. The structural fatigue testing device based on the loading actuator according to claim 4 is characterized in that: A second movable opening (35) is transversely opened on the top of the fixed box (28), and the bottom end of the second inner support block (34) extends through the inside of the second movable opening (35) to the inner cavity of the fixed box (28).

6. The structural fatigue testing device based on a loading actuator according to claim 1 is characterized in that: Both ends of the bottom of the fixed box (28) are fixedly connected with sliding blocks, and both ends of the top of the base (1) are provided with sliding grooves adapted to the sliding blocks.

7. The structural fatigue testing device based on a loading actuator according to claim 1 is characterized in that: The driving structure comprises a linkage box (8) and a transmission rod (21); the linkage box (8) is fixedly connected to the bottom of the other side of the transmission box (14); the transmission rod (21) is rotatably connected to the inner cavity of the linkage box (8); one end of the transmission rod (21) passes through the interior of the transmission box (14) and the connecting pipe (20) in sequence, and is rotatably extended to the inner cavity of the base (1); one end of the transmission rod (21) is fixedly connected to a first bevel gear (23); a front end of the surface of the transmission threaded rod (24) is fixedly connected to a second bevel gear (25) meshing with the first bevel gear (23); and the inner cavity of the transmission box (14) is provided with a linkage structure for driving the transmission rod (21) to reciprocate.

8. The structural fatigue testing device based on the loading actuator according to claim 7 is characterized in that: The linkage structure comprises an L-shaped rod (16), a rack plate (17) and a cross rod (19); the L-shaped rod (16) is fixedly connected to the other end of the moving box (4); the other end of the L-shaped rod (16) movably extends to the inner cavity of the transmission box (14); the cross rod (19) is rotatably connected to the top of the inner cavity of the linkage box (8); the rack plate (17) is vertically fixedly connected to the bottom end of the L-shaped rod (16); one end of the cross rod (19) rotatably extends to the inner cavity of the transmission box (14) and is fixedly connected to a transmission gear (18) meshing with the rack plate (17); the other end of the cross rod (19) and the other end of the transmission rod (21) are both fixedly connected to pulleys (22); the two pulleys (22) are connected by belt transmission.

9. The structural fatigue testing device based on the loading actuator according to claim 8 is characterized in that: A second movable opening (15) is vertically opened on the upper part of one side of the transmission box (14), and the other end of the L-shaped rod (16) extends through the inside of the second movable opening (15) to the inner cavity of the transmission box (14).

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