A pre-tension test tooling for steel cables on a military aircraft

Abstract

The present invention discloses a pre-tension test tooling for steel cables on military aircraft, which relates to the technical field of aerospace. The present invention includes a horizontal plate and also includes a stretching and amplifying mechanism. The stretching and amplifying mechanism includes a positioning rod, the positioning rod is fixedly connected to the horizontal plate, the first support rod and the second support rod are sequentially rotatably connected to the circumferential side of the positioning rod, positioning grooves are provided on both the first support rod and the second support rod, a connecting frame is fixedly connected to the surface of the horizontal plate, a hydraulic cylinder is fixedly connected to the connecting frame, and a locking sleeve is fixedly connected to the output end of the hydraulic cylinder. When in use, the present invention magnifies the stretching condition of the steel cable through a cross-shaped scissors structure, so that it is convenient for the user to detect the length of the steel cable, and when the threshold value is reached, the limit of the locking rod on the control block can be released, so that when the fixed value is reached, the tension on the steel cable can be automatically released, avoiding excessive tension on the steel cable and preventing the steel cable from accidentally breaking when it is stretched too long.

Description

Technical Field

[0001] The present invention relates to the technical field of aerospace, and in particular to a pre-tension test tooling for steel cables on military aircraft. Background Art

[0002] All kinds of steel cables on the aircraft need to be pre-tensioned during factory production, that is, by applying hydraulic pressure to apply tensile force and stretch the distance of the steel cable, so that the internal stress of the steel cable is redistributed, and the residual stress generated by the manufacturing process is eliminated. This treatment method can reduce the generation of fatigue cracks caused by stress concentration during the use of the steel cable, thereby extending its service life. When using the existing equipment to pre-tension the steel cable, the actuator is prone to apply too much tensile force to the steel cable, resulting in its fracture, causing serious economic losses and possible safety accidents. Summary of the Invention

[0003] The purpose of the present invention is to solve the defect that when pre-tensioning the steel cable in the prior art, it is easy to apply too much tensile force to the steel cable, resulting in its excessive stretching and fracture, and to propose a pre-tension test tooling for steel cables on military aircraft.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] Design a pre-tension test tooling for steel cables on military aircraft, including a cross plate, and further including a stretching and amplifying mechanism. The stretching and amplifying mechanism includes a positioning rod, the positioning rod is fixedly connected to the cross plate, the first support rod and the second support rod are sequentially rotatably connected to the circumferential side of the positioning rod, positioning grooves are provided on both the first support rod and the second support rod, a connecting frame is fixedly connected to the surface of the cross plate, a hydraulic cylinder is fixedly connected to the connecting frame, a locking sleeve is fixedly connected to the output end of the hydraulic cylinder, a sliding rod is slidably connected in the locking sleeve, a tensile force sensor is fixedly connected to the end of the sliding rod, a T-shaped rod is fixedly connected to the side of the tensile force sensor, two driving rods are symmetrically fixedly connected to the side of the T-shaped rod, the driving rods are slidably matched with the corresponding positioning grooves, and a first hook is fixedly connected to the side of the T-shaped rod.

[0006] Preferably, sliding sleeves are slidably connected to both the first support rod and the second support rod, two observation rails are symmetrically fixedly connected to the cross plate, ear plates are slidably connected in the observation rails, a rotating rod is rotatably connected to the side of the ear plate, and the two rotating rods are respectively fixedly connected to the corresponding sliding sleeves.

[0007] Preferably, a measuring scale is fixedly connected to the side of the observation rail, scale lines are provided on the measuring scale, an extension plate is fixedly connected to the side of the ear plate, and an observation pin is fixedly connected to the extension plate.

[0008] Preferably, a control block is fixedly connected to the end of the sliding rod. The control block is slidably matched with the locking sleeve. Two locking holes are symmetrically formed in the control block. A locking rod is inserted into the locking hole. A connecting rod is fixedly connected to the end of the locking rod.

[0009] Preferably, a steel cable loosening and breaking mechanism is fixedly connected to the side surface of the ear plate. The steel cable loosening and breaking mechanism includes a tightening and loosening platform. The tightening and loosening platform is fixedly connected to the ear plate. The tightening and loosening platform is U-shaped. Two sliders are fixedly connected inside the tightening and loosening platform. The two sliders are arranged staggeredly. The adjacent surfaces of the two sliders are arc-shaped. A lifting block is slidably connected between the slider and the tightening and loosening platform. A driving block is fixedly connected to the side surface of the lifting block. A convex block is fixedly connected to the side surface of the cross plate. A limiting rod is fixedly connected to the convex block. Both driving blocks are slidably matched with the limiting rod.

[0010] Preferably, two sliding platforms are symmetrically and fixedly connected to the side surface of the cross plate. An installation platform is slidably connected inside the sliding platform. A moving sleeve is fixedly connected to the installation platform. A bidirectional lead screw is rotatably connected through the cross plate. A motor is fixedly connected to the cross plate. The output end of the motor is fixedly connected to the bidirectional lead screw. The moving sleeve is in threaded cooperation with the bidirectional lead screw.

[0011] Preferably, a first moving platform is bolted to the installation platform near the hydraulic cylinder, and a second moving platform is bolted to the installation platform far from the hydraulic cylinder. The first moving platform is slidably matched with the hydraulic cylinder. A second hook is fixedly connected to the first moving platform.

[0012] Preferably, a directional wheel is rotatably connected to the second moving platform. A third hook is fixedly connected to the side surface of the second moving platform. Plug holes are formed in two opposite side surfaces of the locking sleeve, and the plug holes correspond to the locking holes.

[0013] Preferably, a limiting block is fixedly connected to the end of the driving rod. Two limiting rails are symmetrically and fixedly connected to the cross plate. The limiting block is slidably matched with the limiting rail.

[0014] The beneficial effects of a pre-tension test tooling for a steel cable on a military aircraft proposed by the present invention are as follows: When pre-tensioning the steel cable, the gaps between the internal steel wires of the steel cable are reduced under force, the steel cable is stretched and elongated, and the length change of the steel cable is the same as the moving distance of the T-shaped rod. The movement of the T-shaped rod drives the first support rod and the second support rod to rotate around the positioning rod. The rotation of the first support rod and the second support rod drives the observation pin to move on the measuring scale. Since the scissors-shaped first support rod and the second support rod amplify the stretching result, the stretching condition of the steel cable can be directly observed. And when the observation pin moves to the threshold value on the measuring scale, both locking rods disengage from the control block, releasing the limit on the control block, thereby loosening the steel cable and avoiding excessive tensile force on the steel cable and preventing it from breaking. Description of the Drawings

[0015] Figure 1 It is a structural schematic diagram of a prestretching test tooling for steel cables on a military aircraft.

[0016] Figure 2 It is a state diagram of the steel cable of the present invention after being pre-tightened through the first hook and the second hook.

[0017] Figure 3 It is an assembly drawing of the sliding table and the mounting table of the present invention.

[0018] Figure 4 It is an assembly drawing of the first moving table and the hydraulic cylinder of the present invention.

[0019] Figure 5 It is an assembly drawing of the second moving table, the third hook and the directional wheel of the present invention. [[ID=!20]]

[0020] Figure 6 It is an assembly drawing of the locking sleeve and the sliding rod of the present invention.

[0021] Figure 7 It is an assembly drawing of the positioning groove and the driving rod of the present invention.

[0022] Figure 8 It is an assembly drawing of the convex block and the limiting rod of the present invention.

[0023] Figure 9 It is Figure 8 an enlarged view of part A in

[0024] Figure 10 It is an assembly drawing of the lifting block and the tensioning table of the present invention.

[0025] Figure 11 It is an assembly drawing of the locking hole and the locking rod of the present invention.

[0026] Figure 12 It is a structural schematic diagram of the first moving table of the present invention.

[0027] In the drawings, the list of components represented by each reference numeral is as follows:

[0028] 1. Cross plate; 2. Positioning rod; 3. First support rod; 4. Second support rod; 5. Positioning groove; 6. Connecting frame; 7. Hydraulic cylinder; 8. Locking sleeve; 9. Slide bar; 10. Tensile force sensor; 11. T-shaped rod; 12. First hook; 13. Driving rod; 14. Observation rail; 15. Ear plate; 16. Rotating rod; 17. Slide sleeve; 18. Measuring scale; 19. Extension plate; 20. Observation pin; 21. Control block; 22. Locking hole; 23. Locking rod; 24. Connecting rod; 25. Convex block; 26. Limiting rod; 27. Tightening platform; 28. Slide block; 29. Lifting block; 30. Driving block; 31. Sliding table; 32. Installation table; 33. Moving sleeve; 34. Bi-directional lead screw; 35. Motor; 36. First moving table; 37. Second moving table; 38. Second hook; 39. Directional wheel; 40. Third hook; 41. Jack; 42. Limiting block; 43. Limiting rail; 44. Steel cable; 45. Hanging sleeve. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0030] Embodiment 1

[0031] Referring to Figures 1-12 , the present invention is a pre-tension test tooling for steel cables on military aircraft, including a cross plate 1, and further including a stretching and amplifying mechanism. The stretching and amplifying mechanism includes a positioning rod 2, which is fixedly connected to the cross plate 1. The first support rod 3 and the second support rod 4 are sequentially rotatably connected to the circumferential surface of the positioning rod 2. Positioning grooves 5 are provided on both the first support rod 3 and the second support rod 4. A connecting frame 6 is fixedly connected to the surface of the cross plate 1. A hydraulic cylinder 7 is fixedly connected to the connecting frame 6. The output end of the hydraulic cylinder 7 is fixedly connected to a locking sleeve 8. A slide bar 9 is slidably connected inside the locking sleeve 8. A tensile force sensor 10 is fixedly connected to the end of the slide bar 9. A T-shaped rod 11 is fixedly connected to the side of the tensile force sensor 10. Two driving rods 13 are symmetrically and fixedly connected to the side of the T-shaped rod 11. The driving rods 13 are slidably matched with the corresponding positioning grooves 5. A first hook 12 is fixedly connected to the side of the T-shaped rod 11.

[0032] The operation process of this embodiment is as follows: After one end of the steel cable to be pre-stretched is fixed, the hanging sleeve 45 at the other end of the steel cable 44 is connected to the first hook 12. At this time, the hydraulic cylinder 7 contracts, driving the locking sleeve 8, the sliding rod 9 and the tension sensor 10 to move towards the right. The movement of the tension sensor 10 drives the T-shaped rod 11 and the first hook 12 to move to the right. The T-shaped rod 11 is fixed to the side of the tension sensor 10 and moves synchronously, thereby pulling the steel cable for pre-stretching operation. By stretching the steel cable, the internal stress of the steel cable is redistributed, and the residual stress generated by the manufacturing process is eliminated. The tension sensor 10 monitors the tension applied to the steel cable by the hydraulic cylinder 7 and displays the specific value on the display screen on the surface. As the hydraulic cylinder 7 continuously inputs axial tension, the steel cable is stretched accordingly, but it is difficult to visually detect its length change with the naked eye, and the steel cable may be damaged due to excessive tension;

[0033] As the hydraulic cylinder 7 continuously inputs pressure, the gap between the steel wires decreases, the contact between the steel wires becomes closer, and the internal residual stress is gradually eliminated. However, the elongation of the steel cable may be too large, resulting in the fracture of the steel cable. As Figures 1-9 shown, at the initial stage of stretching, the driving rod 13 is located at the leftmost side of the positioning groove 5. The lengths of the first support rod 3 and the second support rod 4 on the side close to the hydraulic cylinder 7 are greater than those on the other side, and both the first support rod 3 and the second support rod 4 can rotate around the positioning rod 2. When the steel cable is stretched, it is difficult to visually observe its specific length in real time, and it may break due to excessive stretching. As the steel cable is gradually stretched, the T-shaped rod 11 gradually moves towards the right, and the moving distance of the T-shaped rod 11 is the same as the actual stretching distance of the steel cable. The movement of the T-shaped rod 11 drives the two driving rods 13 to move horizontally towards the right;

[0034] As Figure 8 shown, the first support rod 3 and the second support rod 4 are in a scissor shape. As the stretching length of the steel cable increases, both the first support rod 3 and the second support rod 4 rotate synchronously in the opposite direction. By observing the rod distance between the first support rod 3 and the second support rod 4 on the right side, the stretching condition of the steel cable can be clearly observed and recorded. In actual use, the initial position of the T-shaped rod 11 is fixed, and the moving distance after stretching is short. It is difficult for the user to directly observe the length change of the steel cable. However, through the magnification mechanism composed of the scissor-shaped first support rod 3 and the second support rod 4, the stretching displacement of the steel cable is visually magnified, and the length change of the steel cable during stretching can be understood by observing the rod distance on the right side. It can effectively prevent the steel cable from being stretched too long, resulting in its fracture, and avoid economic losses and safety accidents.

[0035] Embodiment 2

[0036] During use, the stretching and extension distance of the steel cable during the pre-stretching operation is judged based on the rod distance between the first support rod 3 and the second support rod 4. Although the stretching condition is magnified by the scissor-shaped first support rod 3 and the second support rod 4, it is still difficult for the user to directly observe. For this reason, please refer to Figures 8-9, on the basis of the first specific embodiment, sliding sleeves 17 are slidably connected to both the first rod 3 and the second rod 4. Two observation rails 14 are symmetrically and fixedly connected to the cross plate 1. An ear plate 15 is slidably connected within the observation rail 14. A rotating rod 16 is rotatably connected to the side of the ear plate 15. The two rotating rods 16 are respectively fixedly connected to the corresponding sliding sleeves 17. A measuring scale 18 is fixedly connected to the side of the observation rail 14. Scale lines are provided on the measuring scale 18. An extension plate 19 is fixedly connected to the side of the ear plate 15. An observation pin 20 is fixedly connected to the extension plate 19.

[0037] The operation process of this embodiment is as follows: When the steel cable is stretched, due to the sliding fit between the ear plate 15 and the observation rail 14, and sliding sleeves 17 are slidably connected to both the first rod 3 and the second rod 4, the first rod 3 and the second rod 4 rotate along the positioning rod 2. As the first rod 3 and the second rod 4 rotate, as Figure 9 shown, both ear plates 15 move towards the left on the observation rail 14. When the ear plate 15 moves, it drives the extension plate 19 and the observation pin 20 to move. Due to the sliding fit between the ear plate 15 and the observation rail 14, in this state, the ear plate 15 and the extension plate 19 move linearly along the observation rail 14 together. In the initial state, the observation pin 20 is located at the rightmost side of the measuring scale 18. During the stretching process of the steel cable, the extension plate 19 and the observation pin 20 gradually move towards the left. Based on the moving path of the observation pin 20 on the measuring scale 18, the stretching situation of the steel cable can be observed more intuitively, effectively avoiding the difficulty of visually judging the stretching distance of the steel cable during pre-stretching, and the steel cable being stretched too long due to excessive force, resulting in the fracture of the steel cable.

[0038] Embodiment 3

[0039] When the steel cable is stretched under force during the pre-stretching operation and its length becomes longer, the stretching situation of the steel cable is judged based on the moving path of the observation pin 20 on the measuring scale 18 to avoid excessive force exerted by the hydraulic cylinder 7 and cause the fracture of the steel cable. When the stretching length of the steel cable exceeds the threshold value, it is difficult to automatically release the tension on the steel cable, and the steel cable still has the possibility of fracture. For this reason, please refer to Figures 10-11On the basis of the specific embodiment 1, the end of the slide rod 9 is fixedly connected to a control block 21, and the control block 21 slides with the locking sleeve 8. Two locking holes 22 are symmetrically provided on the control block 21, and a locking rod 23 is inserted in the locking hole 22. The end of the locking rod 23 is fixedly connected to the connecting rod 24. The side of the ear plate 15 is fixedly connected to a steel cable loosening mechanism. The steel cable loosening mechanism includes a tensioning platform 27, which is fixedly connected to the ear plate 15. The tensioning platform 27 is U-shaped, and two sliders 28 are fixedly connected in the tensioning platform 27. The two sliders 28 are staggered, and the adjacent surfaces of the two sliders 28 are arc surfaces. A lifting block 29 is slidably connected between the slider 28 and the tensioning platform 27. A driving block 30 is fixedly connected to the side of the lifting block 29. A protrusion 25 is fixedly connected to the side of the cross plate 1. A limiting rod 26 is fixedly connected to the protrusion 25, and the two driving blocks 30 both slide with the limiting rod 26.

[0040] The operation process of this embodiment is as follows: during the pre-stretching operation, the hydraulic cylinder 7 pulls the locking sleeve 8 to move to the right, thereby moving the locking sleeve 8 to drive the pre-stretching operation of the steel cable. In this state, the two locking rods 23 are respectively inserted into their corresponding locking holes 22 to achieve mechanical limit of the control block 21. When the loosening threshold is set, the steel cable begins to be gradually stretched. Figure 10 As shown, when the ear plate 15 moves toward the right, it synchronously drives the tensioning platform 27 and the slider 28 to move toward the right. When the tensioning platform 27 moves to the right until the lifting block 29 abuts against the slider 28 at the bottom, the slider 28 pushes the lifting block 29 to rise vertically under the influence of the sliding cooperation relationship between the driving block 30 and the limiting rod 26. The position of the tensioning platform 27 on the ear plate 15 is preset. When the ear plate 15 reaches a preset value, the slider 28 is triggered to perform the lifting action of the lifting block 29.

[0041] The tensioning platforms 27 and sliders 28 on both sides are arranged in opposite directions. When the cable is stretched to the set length, the tensioning platform 27 on the upper side will drive the corresponding lifting block 29 to lift upward, while the tensioning platform 27 on the lower side will drive the corresponding lifting block 29 to reset downward. The two driving blocks 30 move in opposite directions. Figure 11As shown in the figure, during the pre-tensioning operation, the locking rod 23 is always inserted into the locking hole 22. Although there is a sliding fit between the sliding rod 9 and the locking sleeve 8, due to the mechanical limiting effect of the locking rod 23, the sliding rod 9 always remains stationary within the locking sleeve 8. At this time, when the tensile length of the steel cable exceeds the threshold value, the displacement of the driving block 30 is transmitted through the connecting rod 24, and finally the locking rod 23 is completely withdrawn from the locking hole 22, thereby releasing the axial constraint on the control block 21. After losing the limit, the tensile force sensor 10 and the sliding rod 9 can move within the locking sleeve 8. That is, when the steel cable is pre-tensioned and the tensile length exceeds the specified threshold value, the locking rod 23 can be withdrawn from the locking hole 22, thereby releasing the limit on the sliding rod 9 and the control block 21, loosening the axial tensile force on the steel cable. After the automatic breaking mechanism is triggered, the hydraulic cylinder 7 immediately stops applying force and gives an audible and visual alarm prompt, which can prevent the steel cable from being over-stretched and broken during the pre-tensioning operation.

[0042] Embodiment 4

[0043] When pre-tensioning steel cables of different lengths, due to the different lengths of the steel cables, although one end of the steel cable is connected to the first hook 12 and the position is fixed, it is difficult to fix the position of the other end of the steel cable. Therefore, please refer to Figures 1-12 , on the basis of the specific Embodiment 1, two sliding platforms 31 are symmetrically and fixedly connected to the side surface of the cross plate 1. An installation platform 32 is slidably connected within the sliding platform 31. A moving sleeve 33 is fixedly connected to the installation platform 32. A bidirectional lead screw 34 is rotatably connected through the cross plate 1. A motor 35 is fixedly connected to the cross plate 1. The output end of the motor 35 is fixedly connected to the bidirectional lead screw 34. The moving sleeve 33 is in threaded cooperation with the bidirectional lead screw 34. A first moving platform 36 is bolted to the installation platform 32 on the side close to the hydraulic cylinder 7, and a second moving platform 37 is bolted to the installation platform 32 on the side far from the hydraulic cylinder 7. The first moving platform 36 is in sliding cooperation with the hydraulic cylinder 7. A second hook 38 is fixedly connected to the first moving platform 36. A directional wheel 39 is rotatably connected to the second moving platform 37. A third hook 40 is fixedly connected to the side surface of the second moving platform 37. Insertion holes 41 are formed in two opposite side surfaces of the locking sleeve 8, and the insertion holes 41 correspond to the locking holes 22. A limiting block 42 is fixedly connected to the end of the driving rod 13. Two limiting rails 43 are symmetrically and fixedly connected to the cross plate 1. The limiting block 42 is in sliding cooperation with the limiting rails 43.

[0044] The operation process of this embodiment is as follows: When in use, after hanging the hanging sleeve 45 at one end of the steel cable on the first hook 12, the other end can be fixed on the second hook 38 according to the actual length of the steel cable. The steel cable bypasses the directional wheel 39. During the pre-tensioning operation, this design can effectively reduce the space occupied by the device and improve the space utilization efficiency. When the steel cable is too long, adaptive adjustment can be achieved by switching the third hook 40, thereby improving the applicability of the device;

[0045] In the initial stage of the prestretching operation of the steel cable, the steel cable needs to be kept in a pre-tightened state in the initial stretching stage. The bidirectional lead screw 34 is driven to rotate by the motor 35, driving the two moving sleeves 33 to move in a reverse linear motion along the bidirectional lead screw 34, realizing the adjustment of the tightness of the steel cable, so that the steel cable remains pre-tightened in the initial stage of the prestretching stage. The sliding table 31 limits the moving path of the mounting table 32 to prevent the steel cable from undergoing non-linear deformation. During the movement of the driving rod 13, the cooperation and constraint between the limiting block 42 and the limiting rail 43 effectively enhance the stability of the system.

[0046] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, with equivalent substitution or change, should be covered within the protection scope of the present invention.

Claims

1. A pre-tension test tooling for steel cables on a military aircraft, including a horizontal plate (1), characterized in that: It further includes a stretching and amplifying mechanism. The stretching and amplifying mechanism includes a positioning rod (2), and the positioning rod (2) is fixedly connected to the cross plate (1). A first support rod (3) and a second support rod (4) are sequentially rotatably connected to the circumferential surface of the positioning rod (2). Positioning grooves (5) are formed on both the first support rod (3) and the second support rod (4). A connecting frame (6) is fixedly connected to the surface of the cross plate (1), and a hydraulic cylinder (7) is fixedly connected to the connecting frame (6). The output end of the hydraulic cylinder (7) is fixedly connected to a locking sleeve (8). A sliding rod (9) is slidably connected in the locking sleeve (8). A tension sensor (10) is fixedly connected to the end of the sliding rod (9). A T-shaped rod (11) is fixedly connected to the side of the tension sensor (10). Two driving rods (13) are symmetrically and fixedly connected to the side of the T-shaped rod (11), and the driving rods (13) are slidably matched with the corresponding positioning grooves (5). A first hook (12) is fixedly connected to the side of the T-shaped rod (11). The first support rod (3) and the second support rod (4) are in a scissor shape. As the stretching length of the steel cable increases, both the first support rod (3) and the second support rod (4) rotate synchronously and in opposite directions. By observing the rod distance between the first support rod (3) and the second support rod (4) on the right side, the stretching condition of the steel cable can be clearly observed and recorded.

2. The pre-tension test tooling for steel cables on a military aircraft according to claim 1, characterized in that, Sliding sleeves (17) are slidably connected to both the first support rod (3) and the second support rod (4). Two observation rails (14) are symmetrically and fixedly connected to the cross plate (1). An ear plate (15) is slidably connected in the observation rail (14). A rotating rod (16) is rotatably connected to the side of the ear plate (15), and the two rotating rods (16) are respectively fixedly connected to the corresponding sliding sleeves (17).

3. The pre-tension test tooling for steel cables on a military aircraft according to claim 2, characterized in that, A measuring scale (18) is fixedly connected to the side of the observation rail (14). Scale lines are provided on the measuring scale (18). An extension plate (19) is fixedly connected to the side of the ear plate (15), and an observation pin (20) is fixedly connected to the extension plate (19).

4. A pre-tension test tooling for steel cables on a military aircraft according to claim 1, characterized in that, A control block (21) is fixedly connected to the end of the sliding rod (9). The control block (21) is slidably matched with the locking sleeve (8). Two locking holes (22) are symmetrically formed in the control block (21). A locking rod (23) is inserted into the locking hole (22), and a connecting rod (24) is fixedly connected to the end of the locking rod (23).

5. The pre-tension test tooling for steel cables on a military aircraft according to claim 3, characterized in that, A cable loosening and breaking mechanism is fixedly connected to the side of the ear plate (15). The cable loosening and breaking mechanism includes a tensioning platform (27), which is fixedly connected to the ear plate (15). The tensioning platform (27) is U-shaped. Two sliders (28) are fixedly connected inside the tensioning platform (27). The two sliders (28) are arranged staggeredly. The adjacent surfaces of the two sliders (28) are arc-shaped. A lifting block (29) is slidably connected between the slider (28) and the tensioning platform (27). A driving block (30) is fixedly connected to the side of the lifting block (29). A convex block (25) is fixedly connected to the side of the cross plate (1). A limiting rod (26) is fixedly connected to the convex block (25). Both of the two driving blocks (30) are slidably matched with the limiting rod (26).

6. The pre-tensioning test tooling for steel cables on a military aircraft according to claim 1, characterized in that, Two sliding platforms (31) are symmetrically and fixedly connected to the side of the cross plate (1). An installation platform (32) is slidably connected inside the sliding platform (31). A moving sleeve (33) is fixedly connected to the installation platform (32). A bidirectional lead screw (34) is rotatably connected through the cross plate (1). A motor (35) is fixedly connected to the cross plate (1). The output end of the motor (35) is fixedly connected to the bidirectional lead screw (34). The moving sleeve (33) is in threaded cooperation with the bidirectional lead screw (34).

7. A pre-stretching test tooling for steel cables on a military aircraft according to claim 1, characterized in that A first moving platform (36) is bolted to the installation platform (32) on the side close to the hydraulic cylinder (7), and a second moving platform (37) is bolted to the installation platform (32) on the side far from the hydraulic cylinder (7). The first moving platform (36) is slidably matched with the hydraulic cylinder (7). A second hook (38) is fixedly connected to the first moving platform (36).

8. A pre-tension test tooling for steel cables on a military aircraft according to claim 7, characterized in that, A directional wheel (39) is rotatably connected to the second moving platform (37). A third hook (40) is fixedly connected to the side of the second moving platform (37). Insertion holes (41) are formed in both opposite sides of the locking sleeve (8), and the insertion holes (41) correspond to the locking holes (22).

9. The pre-tension test tooling for the steel cable on a military aircraft according to claim 1, characterized in that, A limiting block (42) is fixedly connected to the end of the driving rod (13). Two limiting rails (43) are symmetrically and fixedly connected to the cross plate (1). The limiting block (42) is slidably matched with the limiting rails (43).

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