A structure fatigue test device based on a loading actuator

Abstract

The application provides a structure fatigue test device based on a loading actuator, which comprises a base, the upper surface of the base is vertically fixedly connected with a plurality of support columns, the upper part of the surface of the support column is fixedly connected with a support plate, the upper surface of the support plate is vertically fixedly connected with an MTS actuator body, the bottom end of the MTS actuator body is pulled and extended to the lower part of the support plate and is fixedly connected with a moving box. The structure fatigue test device based on the loading actuator can drive the two first inner support blocks to move away from each other through the first transmission mechanism after the two first inner support blocks are embedded into the top inner part of the automobile elastic component structure, and can perform the extension and contraction deformation fatigue test on the automobile elastic component structure through the extension and contraction movement of the MTS actuator body after the top inner support of the automobile elastic component structure is fixed by the first inner support blocks.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fatigue test, in particular to a structure fatigue test device based on loading actuator BACKGROUND

[0002] MTS actuator is a kind of physical performance testing instrument widely used in many engineering fields, especially in civil engineering, water conservancy engineering, transportation engineering and other fields, MTS actuator has many types, among which electro-hydraulic servo actuator is a more common one, this actuator is mainly used for static and dynamic test of large bridge and building structure or component, seismic response pseudo dynamic test, etc., it adopts electro-hydraulic servo closed loop control structure, which is composed of multiple systems, including digital control system, loading test system and data analysis processing system, etc., these systems cooperate together to realize accurate control and data acquisition of test object.

[0003] In the prior art, during the production and processing of automobile elastic component structure, MTS actuator is needed to perform fatigue test on the elastic component structure, but the existing structure fatigue test device based on loading actuator can only press up and down the automobile elastic component structure during use, and the test effect is poor, which is not conducive to the production and processing of automobile elastic component structure.

[0004] Therefore, it is necessary to provide a new structure fatigue test device based on loading actuator to solve the above technical problems. SUMMARY

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

[0006] To solve the above technical problems, the structure fatigue test device based on loading actuator provided by the present application comprises 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 and extended to below the support plate, and a moving box is fixedly connected, and the two ends of the bottom of the moving box are provided with first inner support blocks moving in the horizontal direction through first transmission mechanisms;

[0007] A fixed box is slidably arranged on the top of the base, and second inner support blocks moving in the horizontal direction are arranged at the two ends of the top of the fixed box through second transmission mechanisms;

[0008] Another end of the base is transversely communicated with a communicating pipe, another end of the communicating pipe is vertically communicated with a transmission box, the inner cavity of the base is rotationally connected with a transmission threaded rod, the surface of the transmission threaded rod is threadedly connected with a transmission threaded sleeve, the top of the transmission threaded sleeve is vertically fixedly connected with a vertical rod, the top end of the vertical rod is movably extended to the outside of the base and is fixedly connected with the bottom of the fixed box, 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 comprises a first shell, a first bidirectional threaded rod and a first motor, one end of the first shell is fixedly connected with the moving box, the first motor is fixedly connected with the inside of the first shell, the first bidirectional threaded rod is rotationally connected with the inner cavity of the moving box, one end of the first bidirectional threaded rod is extended to the inner cavity of the first shell and is fixedly connected with the output shaft of the first motor, the surfaces of both ends of the first bidirectional threaded rod are threadedly connected with first threaded sleeves, the bottom of the first threaded sleeve is fixedly connected with a first connecting rod, the top of the first inner supporting block is movably extended to the inner cavity of the moving box and is fixedly connected with the surface of the same end of the first connecting rod.

[0010] Preferably, the bottom of the moving box is transversely provided with a first movable opening, the top end of the first inner supporting block is extended to the inner cavity of the moving box through the inside of the first movable opening.

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

[0012] Preferably, the top of the fixed box is transversely provided with a third movable opening, the bottom end of the second inner supporting block is extended to the inner cavity of the fixed box through the inside of the third movable opening.

[0013] Preferably, both ends of the bottom of the fixed box are fixedly connected with sliding blocks, both ends of the top of the base are provided with sliding grooves matched with 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 passes through the interior of the transmission box and the connecting pipe in sequence, and extends rotatably to the inner cavity of the base. One end of the transmission rod is fixedly connected to a first bevel gear. The front end of the transmission thread rod surface is fixedly connected to a second bevel gear that meshes with the first bevel gear. The inner cavity of the transmission box is provided with a linkage structure that drives the transmission rod to reciprocate.

[0015] Preferably, the linkage structure includes an L-shaped rod, a rack plate, and a crossbar. The L-shaped rod is fixedly connected to the other end of the movable box, and the other end of the L-shaped rod extends movably into the inner cavity of the transmission box. The crossbar 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 crossbar extends rotatably into the inner cavity of the transmission box and is fixedly connected to a transmission gear that meshes with the rack plate. The other end of the crossbar and the other end of the transmission rod are both fixedly connected to pulleys, and the two pulleys are connected by belt drive.

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

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

[0018] This invention provides a structural fatigue testing device based on a loading actuator. After a worker places the automotive elastic component structure on top of a fixed box, a second transmission mechanism drives two second inner support blocks away from each other. The inner support blocks then contact the inner wall of the automotive elastic component structure, thus internally supporting and fixing the bottom of the structure. Next, the MTS actuator extends, causing the moving box to descend. After the two first inner support blocks embed into the top of the automotive elastic component structure, the first transmission mechanism drives the two first inner support blocks away from each other, thus internally supporting and fixing the bottom of the automotive elastic component. After the top inner support of the component structure is fixed, the MTS actuator body can be moved telescopically to conduct a fatigue test on the automotive elastic component structure. After being driven by the linkage structure and drive structure, the transmission threaded rod can be driven to rotate back and forth. Then, by using the connection between the transmission threaded sleeve and the vertical rod, the fixed box can be moved back and forth to conduct a fatigue test on the lateral deformation stiffness of the automotive elastic component structure. The fatigue test effect on the automotive elastic component structure is good, which is beneficial to the production, processing and use of automotive elastic component structures. Moreover, the spacing can be adjusted by the second inner support block and the first inner support block, so it can be adapted to the testing of automotive elastic component structures of different specifications. Attached Figure Description

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

[0020] Figure 2 for Figure 1 The diagram shows a frontal sectional view of the structure.

[0021] Figure 3 for Figure 1 The diagram shows the structure of the base and the transmission threaded rod.

[0022] Figure 4 for Figure 1 The diagram shows the structure of the second transmission mechanism.

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

[0024] Figure 6 for Figure 1 The diagram shows the structure of the first transmission mechanism.

[0025] The following are the labeling elements in the diagram: 1. Base; 2. Support plate; 3. MTS actuator body; 4. Moving box; 5. First outer 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 port; 13. Support column; 14. Transmission box; 15. Second movable port; 16. L-shaped rod; 17. Rack plate; 18. Transmission gear; 19. Crossbar; 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 outer shell; 32. Second motor; 33. Second connecting rod; 34. Second inner support block; 35. Third movable port. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 ,in, Figure 1 A schematic diagram of a preferred embodiment of the structural fatigue testing device based on a loading actuator provided by the present invention; Figure 2 for Figure 1 The diagram shows a frontal sectional view of the structure. Figure 3 for Figure 1 The diagram shows the structure of the base and the transmission threaded rod. Figure 4 for Figure 1 The diagram shows the structure of the second transmission mechanism. Figure 5 for Figure 1 A schematic diagram of the linkage structure shown; Figure 6 for Figure 1 The diagram shows the structure of the first transmission mechanism. The structural fatigue testing device based on the loading actuator includes a base 1, with several support columns 13 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 columns 13, and the MTS actuator body 3 is vertically fixedly connected to the upper surface of the support plate 2.

[0028] 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 the movable box 4. Both ends of the bottom of the movable box 4 are provided with first inner support blocks 11 that move in the horizontal direction through the first transmission mechanism.

[0029] A fixed box 28 is slidably provided on the top of the base 1. Both ends of the top of the fixed box 28 are provided with second inner support blocks 34 that move in the horizontal direction through a second transmission mechanism.

[0030] The other end of the base 1 is connected to a connecting pipe 20 horizontally, and the other end of the connecting pipe 20 is connected to a transmission box 14 vertically. 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.

[0031] The top of the vertical rod 27 extends movably 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 drive structure for driving the transmission threaded rod 24 to rotate.

[0032] After the staff places the automotive elastic component structure on top of the fixed box 28, the second transmission mechanism will drive the two second inner support blocks 34 to move away from each other. After the second inner support blocks 34 come into contact with the inner wall of the automotive elastic component structure, the bottom end of the automotive elastic component structure can be internally supported and fixed.

[0033] After the MTS actuator body 3 extends, it drives the moving box 4 to descend. After the two first inner support blocks 11 are embedded inside the top of the automotive elastic component structure, the first transmission mechanism can work to drive the two first inner support blocks 11 to move away from each other. After the first inner support blocks 11 fix the top of the automotive elastic component structure, the MTS actuator body 3 can move telescopically to perform a telescopic deformation fatigue test on the automotive elastic component structure.

[0034] After the linkage structure and drive structure are driven, the transmission threaded rod 24 can be driven to rotate back and forth. Then, by using the connection between the transmission threaded sleeve 26 and the vertical rod 27, the fixed box 28 can be driven to move back and forth, so as to perform lateral deformation stiffness fatigue testing on the automotive elastic component structure. The fatigue test effect on the automotive elastic component structure is good.

[0035] It is beneficial for the production, processing and use of automotive elastic component structures, and the spacing can be adjusted by both the second inner support block 34 and the first inner support block 11, so as to adapt to different specifications of automotive elastic component structures for testing.

[0036] The first transmission mechanism includes 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 movable 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 movable box 4, one end of the first bidirectional threaded rod 7 extends into 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, and the top of the first inner support block 11 extends movably into the inner cavity of the movable box 4 and is fixedly connected to the surface of the first connecting rod 10 at the same end.

[0037] After the first motor 6 drives the first bidirectional threaded rod 7 to rotate, it can drive the two first threaded sleeves 9 to move closer or further apart. By using the connection of the first connecting rod 10, the distance between the two first inner support blocks 11 can be adjusted.

[0038] The bottom of the mobile box 4 has a first movable opening 12, and the top of the first inner support block 11 extends into the inner cavity of the mobile box 4 through the inside of the first movable opening 12.

[0039] The second transmission mechanism includes 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 inside 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 into 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 a second threaded sleeve 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 extends movably into the inside of the fixed box 28 and is fixedly connected to the surface of the second connecting rod 33 at the same end.

[0040] After the second motor 32 drives the second bidirectional threaded rod 29 to rotate, it can drive the two second threaded sleeves 30 to move closer or further apart. By using the connection of the second connecting rod 33, the distance between the two second inner support blocks 34 can be adjusted.

[0041] The top of the fixed box 28 is provided with a third movable opening 35, and the bottom end of the second inner support block 34 extends into the inner cavity of the fixed box 28 through the interior of the third movable opening 35.

[0042] Sliding blocks are fixedly connected to both ends of the bottom of the fixed box 28, and sliding grooves that are adapted to the sliding blocks are opened at both ends of the top of the base 1.

[0043] The drive 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 extends rotatably to the inner cavity of the base 1. One end of the transmission rod 21 is fixedly connected to a first bevel gear 23. The front end of the surface of the transmission thread rod 24 is fixedly connected to a second bevel gear 25 that meshes 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 reciprocate.

[0044] The linkage structure includes an L-shaped rod 16, a rack plate 17, and a crossbar 19. The L-shaped rod 16 is fixedly connected to the other end of the movable box 4, and the other end of the L-shaped rod 16 extends movably into the inner cavity of the transmission box 14. The crossbar 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 crossbar 19 extends rotatably into the inner cavity of the transmission box 14 and is fixedly connected to a transmission gear 18 that meshes with the rack plate 17. The other end of the crossbar 19 and the other end of the transmission rod 21 are both fixedly connected to pulleys 22, and the two pulleys 22 are connected by belt drive.

[0045] When the support plate 2 drives the movable box 4 to extend and retract, it can drive the rack plate 17 to move up and down together 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 through the transmission of the two crossbars 19. Then, through the transmission of the first bevel gear 23 and the second bevel gear 25, the transmission threaded rod 24 can be driven to move back and forth.

[0046] 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 into the inner cavity of the transmission box 14 through the interior of the second movable opening 15.

[0047] The working principle of the structural fatigue testing device based on a loading actuator provided by this invention is as follows:

[0048] After the automotive elastic component structure is placed on top of the fixed box 28, the second transmission mechanism drives the two second inner support blocks 34 to move away from each other. After the second inner support blocks 34 abut against the inner wall of the automotive elastic component structure, the bottom end of the automotive elastic component structure is internally supported and fixed. Then, after the MTS actuator body 3 extends, it drives the moving box 4 to descend. After the two first inner support blocks 11 are embedded inside the top end of the automotive elastic component structure, the first transmission mechanism drives the two first inner support blocks 11 to move away from each other. After the first inner support blocks 11 internally support and fix the top end of the automotive elastic component structure, the MTS actuator body 3 can move telescopically to perform a telescopic deformation fatigue test on the automotive elastic component structure. After being driven by the linkage structure and the drive structure, the transmission threaded rod 24 can be driven to reciprocate. Then, by using the connection between the transmission threaded sleeve 26 and the vertical rod 27, the fixed box 28 can be driven to reciprocate to perform a lateral deformation stiffness fatigue test on the automotive elastic component structure.

[0049] Compared with related technologies, the structural fatigue testing device based on a loading actuator provided by the present invention has the following beneficial effects:

[0050] This invention provides a structural fatigue testing device based on a loading actuator. After a worker places the automotive elastic component structure on top of a fixed box 28, the second transmission mechanism drives two second inner support blocks 34 away from each other. The second inner support blocks 34 then contact the inner wall of the automotive elastic component structure, thus internally supporting and fixing the bottom end of the structure. Then, the MTS actuator body 3 extends, causing the moving box 4 to descend. After the two first inner support blocks 11 embed into the top of the automotive elastic component structure, the first transmission mechanism drives the two first inner support blocks 11 away from each other, thus supporting the automotive elastic component structure. After the top inner support of the component structure is fixed, the MTS actuator body 3 can be moved telescopically to perform a telescopic deformation fatigue test on the automotive elastic component structure. After being driven by the linkage structure and the drive structure, the transmission threaded rod 24 can be driven to reciprocate. Then, by using the connection between the transmission threaded sleeve 26 and the vertical rod 27, the fixed box 28 can be moved reciprocally to perform a lateral deformation stiffness fatigue test on the automotive elastic component structure. The fatigue test effect on the automotive elastic component structure is good, which is beneficial to the production, processing and use of the automotive elastic component structure. Moreover, the spacing can be adjusted by the second inner support block 34 and the first inner support block 11, so that it can be adapted to the testing work of automotive elastic component structures of different specifications.

[0051] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A load actuator based structural fatigue testing apparatus comprising a base (1), characterised in that, The upper surface of the base (1) is vertically fixedly connected with a plurality of support columns (13), the upper 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 and extended below the support plate (2), and is fixedly connected with a moving box (4), both ends of the bottom of the moving box (4) are provided with a first inner support block (11) moving in the horizontal direction through a first transmission mechanism; The top of the base (1) is slidably provided with a fixed box (28), both ends of the top of the fixed box (28) are provided with a second inner support block (34) moving in the horizontal direction through a second transmission mechanism; The other end of the base (1) is transversely communicated with a communication pipe (20), the other end of the communication pipe (20) is vertically communicated with a transmission box (14), the inner cavity of the base (1) is rotatably connected with a transmission screw rod (24), the surface of the transmission screw rod (24) is screwedly connected with a transmission screw sleeve (26), the top of the transmission screw sleeve (26) is vertically fixedly connected with a vertical rod (27), the top end of the vertical rod (27) is movably extended to the outside of the base (1), and is fixedly connected with 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 screw rod (24) to rotate; 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 surface 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) penetrates the interiors of the transmission box (14) and the communication 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 with a first bevel gear (23), the front end of the surface of the transmission screw rod (24) is fixedly connected with a second bevel gear (25) engaged 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 reciprocatingly rotate.

2. The load actuator-based structural fatigue test apparatus according to claim 1, characterized by, The first transmission mechanism comprises a first outer shell (5), a first bidirectional screw rod (7) and a first motor (6), the first outer shell (5) is fixedly connected to one end of the moving box (4), the first motor (6) is fixedly connected to the interior of the first outer shell (5), the first bidirectional screw rod (7) is rotatably connected to the inner cavity of the moving box (4), one end of the first bidirectional screw rod (7) is extended to the inner cavity of the first outer shell (5), and is fixedly connected with the output shaft of the first motor (6), both ends of the surface of the first bidirectional screw rod (7) are screwedly connected with first screw sleeves (9), the bottom of the first screw sleeve (9) is fixedly connected with a first connecting rod (10), the top of the first inner support block (11) is movably extended to the inner cavity of the moving box (4), and is fixedly connected with the surface of the first connecting rod (10) at the same end.

3. The load actuator-based structural fatigue test apparatus according to claim 2, characterized by, The bottom of the mobile box (4) is transversely provided with a first movable opening (12), and the top end of the first inner supporting block (11) extends to the inner cavity of the mobile box (4) through the inside of the first movable opening (12).

4. The load actuator-based structural fatigue test apparatus according to claim 1, characterized by, 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 inside 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 with the output shaft of the second motor (32), and the two ends of the surface of the second bidirectional threaded rod (29) are threadedly connected with second threaded sleeves (30), the top of each second threaded sleeve (30) is fixedly connected with a second connecting rod (33), and the bottom end of the second inner supporting block (34) movably extends to the inside of the fixed box (28) and is fixedly connected with the surface of the same end of the second connecting rod (33).

5. The load actuator-based structural fatigue test apparatus according to claim 4, characterized by The top of the fixed box (28) is transversely provided with a third movable opening (35), and the bottom end of the second inner supporting block (34) extends to the inner cavity of the fixed box (28) through the inside of the third movable opening (35).

6. The load actuator based structural fatigue test apparatus according to claim 1, wherein The bottom of the fixed box (28) is fixedly connected with sliding blocks at both ends, and the top of the base (1) is provided with sliding grooves adapted to the sliding blocks at both ends.

7. The load actuator based structural fatigue test apparatus according to claim 1, wherein 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 mobile 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 with a transmission gear (18) engaged with the rack plate (17), and the other end of the cross rod (19) is fixedly connected with a belt pulley (22) at the other end of the transmission rod (21), and the two belt pulleys (22) are drivingly connected through a belt.

8. The load actuator-based structural fatigue test apparatus according to claim 7, characterized by The upper part of the side surface of the transmission box (14) is vertically provided with a second movable opening (15), and the other end of the L-shaped rod (16) extends to the inner cavity of the transmission box (14) through the inside of the second movable opening (15).

Images