An automatic positioning and inspection fixture for connection holes of aircraft structural components

Abstract

This invention relates to the field of automatic positioning and detection technology for connecting holes, specifically to an automatic positioning and detection fixture for connecting holes in aircraft structural components. The fixture includes a support platform, two angle adjustment seats, two double-bar traveling mechanisms, two hole position detection mechanisms, two displacement adjustment mechanisms, two upper contact rods, and two lower contact rods. The two displacement adjustment mechanisms are installed on two symmetrically opposite sides of the top of the support platform. This automatic positioning and detection fixture for connecting holes in aircraft structural components, through the angle adjustment seats and displacement adjustment mechanisms, can position the sides of various skins. After adjustment of the angle adjustment seats and displacement adjustment mechanisms, the upper and lower contact rods can change their length and angle, allowing the double-bar traveling mechanisms to drive the hole position detection mechanisms to perform detection on various skins. The upper and lower contact rods are slidably connected, which is very convenient, and the slidable connection between the upper and lower contact rods does not obstruct the double-bar traveling mechanisms when they move.

Description

Technical Field

[0001] This invention relates to the field of automatic positioning and detection technology for connection holes, and specifically to an automatic positioning and detection fixture for connection holes in aircraft structural components. Background Technology

[0002] Aircraft structural components consist of five main parts: wings, fuselage, tail, landing gear, and power plant. The wings, fuselage, and tail are each composed of a frame and skin. During assembly, the frame is installed first, and then the skin is secured by riveting. The skin has multiple connection holes, each requiring extremely high precision. If even one connection hole is faulty, half of the skin assembly must be disassembled. Therefore, the precision of the skin's connection holes is crucial.

[0003] An aircraft is composed of thousands of skin panels, most of which fall into more than a dozen structural categories. Therefore, batch testing can be used for inspection. However, if the testing equipment can only inspect one type of skin panel, then more than a dozen testing devices would be needed. Since each aircraft would require more than a dozen testing devices, this would result in high costs.

[0004] Therefore, it is necessary to design an automatic positioning and inspection fixture for aircraft structural component connection holes, which can be applied to the inspection of various skin connection holes. Summary of the Invention

[0005] To address the aforementioned technical shortcomings, the purpose of this invention is to provide an automatic positioning and inspection fixture for connection holes in aircraft structural components, applicable to the inspection of various skin connection holes.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The present invention provides an automatic positioning and detection fixture for connecting holes of aircraft structural components, including a support platform, two angle adjustment seats, two double-rod traveling mechanisms, two hole position detection mechanisms, two displacement adjustment mechanisms, two upper contact rods, and two lower contact rods. The two displacement adjustment mechanisms are installed on opposite symmetrical sides of the top of the support platform to drive the angle adjustment seats to move laterally. The angle adjustment seats are fixedly installed on the displacement adjustment mechanisms. The angle adjustment seats include rotatable and adjustable limiting baffles for abutting against the skin side. The two lower contact rods pass through the positioning and detection mechanisms. A horizontally adjustable displacement seat is mounted on a limiting baffle. One end of the lower contact rod is rotatably mounted on the displacement seat. Two upper contact rods are horizontally adjustable and mounted on another limiting baffle via a second displacement seat. One end of the upper contact rod is rotatably mounted on the second displacement seat. The upper and lower contact rods are slidably connected and form a track. A double-rod traveling mechanism is horizontally movable and mounted on the track. A hole position detection mechanism is fixedly mounted on the double-rod traveling mechanism. The double-rod traveling mechanism is used to drive the hole position detection mechanism to move horizontally on the track. The hole position detection mechanism is used to detect the connecting holes on the skin.

[0007] Preferably, the dual-bar traveling mechanism includes at least two upper traveling wheels, at least two support wheels, at least two lower traveling wheels, and a rotating frame for rotating the upper traveling wheels, lower traveling wheels, and support wheels. The two upper traveling wheels are located on the top sides of the upper contact rod, and the upper traveling wheels have contact friction with the top of the upper contact rod. The rotating frame is provided with a driver one for driving the upper traveling wheels to rotate. The two lower traveling wheels are located on the bottom sides of the lower contact rod, and the lower traveling wheels have contact friction with the bottom of the lower contact rod. The rotating frame is provided with a driver two for driving the lower traveling wheels to rotate. The support wheels are located between the upper and lower contact rods, and the outer edges of the support wheels are in contact with both the upper and lower contact rods. A plurality of rotatable limit levers are provided in the middle of one end of the upper contact rod, and a clearance groove is provided on the upper contact rod to avoid the upwardly rotating limit levers. A slot for inserting the limit levers is provided in the middle of one end of the lower contact rod. A support plate is fixedly provided on the rotating frame to prevent the limit levers from getting stuck.

[0008] Preferably, the displacement seat includes a slide and two clamping plates. One end of the lower contact rod is rotatably connected to the slide. The slide is slidably mounted on the limiting baffle. There is a gap between the bottom of the slide and the top of the support platform. The two clamping plates are horizontally slidably mounted on the slide. A puller for driving the two clamping plates closer or further away is fixedly provided on the slide.

[0009] Preferably, the angle adjustment seat further includes a rotating plate, a sliding plate, a sliding column, and an adjusting stud. The limiting baffle and the sliding plate are both fixedly installed on the limiting baffle. The rotating plate is rotatably connected to the displacement adjustment mechanism. The sliding column is fixedly installed on the displacement adjustment mechanism. The sliding plate has an oblong groove for the sliding column to slide horizontally. The adjusting stud is engaged with the sliding plate. One end of the adjusting stud is rotatably connected to the sliding column through a collar.

[0010] Preferably, the displacement adjustment mechanism includes a guide post, a guide seat, and a clamping bolt. The guide seat is fixedly installed on the top of the support platform, the guide post is slidably connected to the guide seat, a threaded plate for the clamping bolt to engage is fixedly provided on the guide post, and a friction plate that contacts the support platform is provided at the bottom of the clamping bolt.

[0011] Preferably, the hole position detection mechanism includes a pin, a distance sensor, an electric push rod, a mounting base, and a lifting slide. The mounting base is fixedly installed on the rotating frame, and the lifting slide is vertically slidable on the mounting base. The electric push rod is fixedly installed on the mounting base, and its output end is locked inside a bracket. The bracket is fixedly connected to the lifting slide. When the lifting slide stops descending, the output end of the electric push rod can continue to push downwards a certain distance. The distance sensor is fixedly installed on the output end of the electric push rod, and its detection end contacts the lifting slide. The pin is fixedly installed on the bottom of the lifting slide, and the bottom of the pin has an angled edge.

[0012] Preferably, both sides of the limiting baffle are provided with a slot 1, and both sides of the limiting baffle are provided with a plurality of extension baffles that can be sequentially engaged. Each extension baffle is provided with a block at one end and a slot 2 at the other end. The block can engage with the slot 2. The slot 2 has the same structure as the slot 1.

[0013] Preferably, multiple extension flaps are provided on both sides of the support platform, and the multiple extension flaps on each side are hinged to each other, and the extension flaps closer to the support platform are hinged to the support platform.

[0014] The beneficial effects of this invention are as follows: the automatic positioning and detection fixture for connecting holes of aircraft structural components, through the angle adjustment seat and displacement adjustment mechanism, can thus position the sides of various skins.

[0015] Furthermore, after adjustment of the angle adjustment seat and displacement adjustment mechanism, the upper and lower contact rods can change their length and angle, enabling the dual-rod traveling mechanism to drive the hole position detection mechanism to perform detection on various skins. Moreover, the upper and lower contact rods are slidably connected, making adjustment very convenient. And when the dual-rod traveling mechanism moves, the slidable connection between the upper and lower contact rods will not obstruct the mechanism. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a top view of the present invention before the skin is changed.

[0019] Figure 3 This is a top view of the invention after the skin has been modified.

[0020] Figure 4 This is a partial three-dimensional structural diagram of the present invention.

[0021] Figure 5 for Figure 4 A partial front view.

[0022] Figure 6 for Figure 4 A partial three-dimensional structural diagram.

[0023] Figure 7 This is a schematic diagram of the three-dimensional structure of displacement seat one.

[0024] Figure 8 This is a three-dimensional structural diagram of the angle adjustment seat.

[0025] Figure 9 This is a three-dimensional structural diagram of the hole position detection mechanism.

[0026] Figure 10 This is an exploded view of the three-dimensional structure of the limiting baffle and the extension baffle.

[0027] Figure 11 A three-dimensional structural diagram of the supporting platform and the extended flap.

[0028] Explanation of reference numerals in the attached drawings: 1-Support platform; 1a-Extension flap; 2-Skin; 2a-Connecting hole; 3-Angle adjustment seat; 3a-Limiting baffle; 3b-Rotating plate; 3c-Slide plate; 3d-Slide column; 3e-Adjusting stud; 3f-Slot one; 4-Double rod walking mechanism; 4a-Upper walking wheel; 4b-Lower walking wheel; 4c-Support wheel; 4d-Rotating frame; 4e-Support plate; 5-Hole position detection mechanism; 5a-Insertion column; 5a1-Angle; 5b-Distance sensor; 5c-Electric push rod; 5d-Mounting seat; 5e-Lifting slide; 5f-Card holder; 6-Displacement adjustment mechanism; 6a-Guide column; 6b-Guide seat; 6c-Securing bolt; 7-Upper contact rod; 7a-Limiting clamp; 8-Lower contact rod; 9-Displacement seat one; 9a-Slide; 9b-Clamping plate; 10-Displacement seat two; 11-Extension baffle. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example: This invention provides an automatic positioning and detection fixture for connection holes in aircraft structural components, such as... Figure 1-3As shown, the system includes a support platform 1, two angle adjustment seats 3, two double-bar traveling mechanisms 4, two hole position detection mechanisms 5, two displacement adjustment mechanisms 6, two upper contact rods 7, and two lower contact rods 8. The two displacement adjustment mechanisms 6 are installed on opposite symmetrical sides of the top of the support platform 1, used to drive the angle adjustment seats 3 to move laterally, increasing the distance between the two angle adjustment seats 3. This allows for limiting the movement of skin panels 2 with the same angle but different widths. The angle adjustment seats 3 are fixedly installed on the displacement adjustment mechanisms 6. Each angle adjustment seat 3 includes a rotatable adjustable limiting baffle 3a, which abuts against the side of the skin panel 2. The limiting baffle 3a can be rotated and adjusted to... Combined with the displacement adjustment mechanism 6, this positioning and detection fixture can limit the movement of skin 2 at different angles and widths. Two lower contact rods 8 are horizontally adjustable and mounted on a limiting baffle 3a via displacement seat 1 9, with one end of each lower contact rod 8 rotatably mounted on displacement seat 1 9. Two upper contact rods 7 are horizontally adjustable and mounted on another limiting baffle 3a via displacement seat 2 10, with one end of each upper contact rod 7 rotatably mounted on displacement seat 2 10. The upper contact rods 7 and lower contact rods 8 are slidably connected. When the distance between the two limiting baffles 3a changes, adjustment can be achieved by extending or retracting the upper contact rods 7 and 8. When the angle between the two limiting baffles 3a changes, the arrangement angle of the multiple connecting holes changes, or both of these changes simultaneously, the angle between the upper contact rods 7 and 8 can be changed by adjusting the distance between displacement seat 1 9 and displacement seat 2 10. Simultaneously with the angle change, the upper contact rods 7 and 8 will extend or retract to accommodate the angle adjustment process. The distance between displacement seat 1 9 and displacement seat 2 10 is adjusted by sliding displacement seat 1 9 or displacement seat 2 10 on the limiting baffle 3a. Figure 2 For the detection location of skin 2, Figure 3 For the detection position of another type of skin 2, the upper contact rod 7 and the lower contact rod 8 form a track. The double-bar traveling mechanism 4 is horizontally movable and installed on the track. The hole position detection mechanism 5 is fixedly installed on the double-bar traveling mechanism 4. The double-bar traveling mechanism 4 is used to drive the hole position detection mechanism 5 to move horizontally on the track. The hole position detection mechanism 5 is used to detect the connecting holes 2a on the skin 2. After the track position for the movement of the double-bar traveling mechanism 4 is installed, the double-bar traveling mechanism 4 travels at a fixed distance on the track. After traveling a certain distance, the hole position detection mechanism 5 detects one connecting hole 2a, thereby determining whether the diameter of the connecting hole 2a, the distance between two connecting holes 2a, and the angle meet the standards.

[0031] In order to allow the upper contact rod 7 and the lower contact rod 8 to slide and adjust while also enabling the double-bar traveling mechanism 4 to travel on the upper contact rod 7 and the lower contact rod 8, such as... Figure 4-6As shown, the dual-bar traveling mechanism 4 includes at least two upper traveling wheels 4a, at least two support wheels 4c, at least two lower traveling wheels 4b, and a rotating frame 4d for rotating the upper traveling wheels 4a, lower traveling wheels 4b, and support wheels 4c. The two upper traveling wheels 4a are located on both sides of the top of the upper contact rod 7, and the upper traveling wheels 4a have contact friction with the top of the upper contact rod 7. The rotating frame 4d is equipped with a driver 1 for driving the upper traveling wheels 4a to rotate. Driven by the driver 1, the upper traveling wheels 4a can travel on the top of the upper contact rod 7 through friction. The two lower traveling wheels 4b are located on both sides of the bottom of the lower contact rod 8, and the lower traveling wheels 4b have contact friction with the bottom of the lower contact rod 8. The rotating frame 4d is equipped with a driver 2 for driving the lower traveling wheels 4b to rotate. Driven by the driver 2, the lower traveling wheels 4b can travel on the bottom of the lower contact rod 8 through friction. The support wheel 4c is located between the upper contact rod 7 and the lower contact rod 8, and the outer edge of the support wheel 4c is in contact with both the upper contact rod 7 and the lower contact rod 8. This allows the support wheel 4c to support and limit the movement of the upper contact rod 7 or the lower contact rod 8, preventing it from falling. The upper contact rod 7 has multiple rotatable limit rods 7a at the middle of one end, and a clearance groove is provided on the upper contact rod 7 to allow the upwardly rotating limit rods 7a to pass. The lower contact rod 8 has a slot at the middle of one end for the limit rods 7a to be inserted, so that the upper contact rod 7 and the lower contact rod 8 can remain parallel and can slide and adjust. The rotating frame 4d is fixedly equipped with a support plate 4e to prevent the limit rods 7a from getting stuck. When the double-rod walking mechanism 4 moves, the limit rods 7a can be pushed upward by the shaft between the two support wheels 4c, so that the limit rods 7a enter the clearance groove. When the limiting lever 7a is not in contact with the pivot of the support wheel 4c, the limiting lever 7a will slide down and rotate under its own weight, causing the limiting lever 7a to lock back into the slot of the lower contact lever 8. The support plate 4e is to prevent the limiting lever 7a from getting stuck between the pivots of the two support wheels 4c when the double-lever traveling mechanism 4 is reversing.

[0032] It is conceivable that the upper traveling wheel 4a can be replaced with a gear, and the top of the upper contact rod 7 can be set as a rack structure. The corresponding relationship between the lower contact rod 8 and the lower traveling wheel 4b can also be this structure. In the intersection section between the upper contact rod 7 and the lower contact rod 8, the first and second drives need to work simultaneously. Alternatively, the drive can be a drive without a self-locking structure, so that when the first drive is working, the second drive is not working, but the lower traveling wheel 4b can be pushed to rotate freely.

[0033] The fixed-distance movement of the dual-bar walking mechanism 4 can be controlled by the open-loop control of the driver, or a displacement sensor can be set to provide feedback control for movement.

[0034] like Figure 7As shown, displacement seat 19 includes a slide 9a and two clamping plates 9b. One end of the lower contact rod 8 is rotatably connected to the slide 9a. The slide 9a is slidably mounted on the limiting baffle 3a. A gap is left between the bottom of the slide 9a and the top of the support platform 1, which allows the skin 2 to be inserted. The size of the gap needs to meet the thickness of the skin. The two clamping plates 9b are horizontally slidably mounted on the slide 9a. A puller for driving the two clamping plates 9b closer or further away is fixedly installed on the slide 9a. The puller generally includes a rotating base and a double-ended stud mounted on the rotating base. Rotating the double-ended stud causes the two clamping plates 9b to move closer or further away simultaneously, thereby fixing displacement seat 19 on the limiting baffle 3a. Displacement seat 210 has the same structure as displacement seat 19, except that the support height of the slide 9a is different because the upper contact rod 7 is located above the lower contact rod 8.

[0035] In order to achieve the angle adjustment of the limit baffle 3a, such as Figure 8 As shown, the angle adjustment seat 3 also includes a rotating plate 3b, a sliding plate 3c, a sliding column 3d, and an adjusting stud 3e. The limiting baffle 3a and the sliding plate 3c are both fixedly installed on the limiting baffle 3a. The rotating plate 3b is rotatably connected to the displacement adjustment mechanism 6. The sliding column 3d is fixedly installed on the displacement adjustment mechanism 6. The sliding plate 3c has an oblong groove for the sliding column 3d to slide horizontally. The adjusting stud 3e is engaged with the sliding plate 3c, and one end of the adjusting stud 3e is rotatably connected to the sliding column 3d via a collar. By engaging the adjusting stud 3e, the adjusting stud 3e pulls the sliding column 3d to slide within the oblong groove, thereby achieving angle adjustment of the limiting baffle 3a.

[0036] like Figure 8 As shown, the displacement adjustment mechanism 6 includes a guide post 6a, a guide seat 6b, and a clamping bolt 6c. The guide seat 6b is fixedly installed on the top of the support platform 1. The guide post 6a is slidably connected to the guide seat 6b. A threaded plate for the clamping bolt 6c to engage is fixedly provided on the guide post 6a. A friction plate that contacts the support platform 1 is provided at the bottom of the clamping bolt 6c. By pushing the guide post 6a, the guide post 6a slides horizontally on the guide seat 6b, thereby realizing the horizontal displacement adjustment of the angle adjustment seat 3. After the adjustment is completed, by rotating the clamping bolt 6c, the clamping bolt 6c pushes the friction plate to abut against the top of the support platform 1, thereby fixing the displacement adjustment mechanism 6.

[0037] In order to detect the connection hole, such as Figure 4 and Figure 9As shown, the hole position detection mechanism 5 includes a pin 5a, a distance sensor 5b, an electric push rod 5c, a mounting base 5d, and a lifting slide 5e. The mounting base 5d is fixedly installed on the rotating frame 4d. The lifting slide 5e is vertically slidably installed on the mounting base 5d. The electric push rod 5c is fixedly installed on the mounting base 5d. The output end of the electric push rod 5c is locked inside the bracket 5f. The bracket 5f is fixedly connected to the lifting slide 5e. When the lifting slide 5e stops descending, the output end of the electric push rod 5c can continue to push downwards a certain distance. The distance sensor 5b is fixedly installed on the output end of the electric push rod 5c. The detection end of the distance sensor 5b is in contact with the lifting slide 5e. The pin 5a is fixedly installed on the bottom of the lifting slide 5e. The bottom of the pin 5a is provided with an angled corner 5a1. After the double-bar walking mechanism 4 completes its movement, the output end of the electric push rod 5c is pushed downwards, which in turn pushes the distance sensor 5b downwards. The lifting slide 5e and the bracket 5f will then descend under their own weight. Once the electric push rod 5c has reached the set distance, it will stop working. If, during the descent of the insertion post 5a, the bottom end of the insertion post 5a cannot be inserted into the connecting hole 2a, the distance sensor 5b will be compressed due to the constant pushing distance of the electric push rod 5c, resulting in a change in displacement. This allows the detection of whether the connecting hole 2a is accurately opened. Furthermore, due to the angle 5a1, the positional error of the connecting hole 2a can be determined by the distance the distance sensor 5b is compressed, as the angle 5a1 ensures that part of the insertion post 5a can be inserted into the connecting hole 2a.

[0038] like Figure 10 As shown, both sides of the limiting baffle 3a are provided with slots 3f. Multiple extension baffles 11 are sequentially engaged on both sides of the limiting baffle 3a. Each extension baffle 11 has a locking block at one end and a slot 2 at the other end. The locking block can engage with the slot 2. The slot 2 has the same structure as slot 3f, meaning the locking block can also engage with slot 3f. By providing multiple extension baffles 11, the length of the limiting baffle 3a can be extended, enabling the device to detect larger skins 2.

[0039] like Figure 11 As shown, multiple extension flaps 1a are provided on both sides of the support platform 1. The multiple extension flaps 1a on each side are hinged to each other, and the extension flaps 1a closest to the support platform 1 are hinged to the support platform 1. When the extension flaps 1a are not in use, the multiple extension flaps 1a are vertically distributed. When it is necessary to extend the support platform 1, the multiple extension flaps 1a are lifted to a horizontal state and then supported by the support mechanism, that is, the extension of the support platform 1 is realized.

[0040] In use, the skin 2 is placed on top of the support platform 1 and positioned by the side of the limiting baffle 3a against the side of the skin 2. The two upper contact rods 7 and the lower contact rod 8 are then adjusted so that the track formed by them is parallel to the two sides of the skin 2, and the track is then fixed. Finally, the double-rod traveling mechanism 4 drives the hole position detection mechanism 5 to move along the track, allowing the double-rod traveling mechanism 4 to detect the multiple connecting holes 2a on the skin 2.

[0041] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An automatic positioning and inspection fixture for connection holes of aircraft structural components, characterized in that, The system includes a support platform (1), two angle adjustment seats (3), two double-rod walking mechanisms (4), two hole detection mechanisms (5), two displacement adjustment mechanisms (6), two upper contact rods (7), and two lower contact rods (8). The two displacement adjustment mechanisms (6) are installed on the top of the support platform (1) on opposite symmetrical sides to drive the angle adjustment seats (3) to move laterally. The angle adjustment seats (3) are fixedly installed on the displacement adjustment mechanisms (6). The angle adjustment seats (3) include a rotatable adjustable limiting baffle (3a). The limiting baffle (3a) is used to abut against the side of the skin (2). The two lower contact rods (8) are horizontally adjustable and installed on a limiting baffle (3a) through a displacement seat (9). (8) One end is rotatably mounted on displacement seat one (9). Two upper contact rods (7) are horizontally adjustable and mounted on another limiting baffle (3a) via displacement seat two (10). One end of the upper contact rod (7) is rotatably mounted on displacement seat two (10). The upper contact rod (7) and the lower contact rod (8) are slidably connected. The upper contact rod (7) and the lower contact rod (8) form a track. The double rod walking mechanism (4) is horizontally movable and mounted on the track. The hole position detection mechanism (5) is fixedly mounted on the double rod walking mechanism (4). The double rod walking mechanism (4) is used to drive the hole position detection mechanism (5) to move horizontally on the track. The hole position detection mechanism (5) is used to detect the connecting hole (2a) on the skin (2).

2. The automatic positioning and detection fixture for connecting holes of aircraft structural components according to claim 1, characterized in that, The double-bar traveling mechanism (4) includes at least two upper traveling wheels (4a), at least two support wheels (4c), at least two lower traveling wheels (4b), and a rotating frame (4d) for rotating the upper traveling wheels (4a), lower traveling wheels (4b), and support wheels (4c). The two upper traveling wheels (4a) are located on the top sides of the upper contact rod (7), and the upper traveling wheels (4a) have contact friction with the top of the upper contact rod (7). The rotating frame (4d) is provided with a driver for driving the upper traveling wheels (4a) to rotate. The two lower traveling wheels (4b) are located on the bottom sides of the lower contact rod (8), and the lower traveling wheels (4b) have contact friction with the bottom of the lower contact rod (8). The rotating frame (4d) is equipped with a second driver for driving the lower traveling wheel (4b) to rotate. The support wheel (4c) is located between the upper contact rod (7) and the lower contact rod (8), and the outer edge of the support wheel (4c) is in contact with both the upper contact rod (7) and the lower contact rod (8). The middle of one end of the upper contact rod (7) is provided with multiple rotatable limit rods (7a), and the upper contact rod (7) is provided with a clearance groove for clearance of the upward rotating limit rod (7a). The middle of one end of the lower contact rod (8) is provided with a slot for the limit rod (7a) to be inserted. The rotating frame (4d) is fixedly provided with a support plate (4e) to prevent the limit rod (7a) from getting stuck.

3. The automatic positioning and detection fixture for connecting holes of aircraft structural components according to claim 2, characterized in that, The displacement seat 1 (9) includes a slide (9a) and two clamps (9b). One end of the lower contact rod (8) is rotatably connected to the slide (9a). The slide (9a) is slidably mounted on the limiting baffle (3a). There is a gap between the bottom of the slide (9a) and the top of the support platform (1). The two clamps (9b) are horizontally slidably mounted on the slide (9a). A puller for driving the two clamps (9b) to move closer or further away is fixedly provided on the slide (9a).

4. The automatic positioning and detection fixture for connecting holes of aircraft structural components according to claim 3, characterized in that, The angle adjustment seat (3) also includes a rotating plate (3b), a sliding plate (3c), a sliding column (3d), and an adjusting stud (3e). The rotating plate (3b) and the sliding plate (3c) are both fixedly installed on the limiting baffle (3a). The rotating plate (3b) is rotatably connected to the displacement adjustment mechanism (6). The sliding column (3d) is fixedly installed on the displacement adjustment mechanism (6). The sliding plate (3c) has a waist-shaped groove for the sliding column (3d) to slide horizontally. The adjusting stud (3e) is engaged with the sliding plate (3c). One end of the adjusting stud (3e) is rotatably connected to the sliding column (3d) through a collar.

5. The automatic positioning and detection fixture for connecting holes of aircraft structural components according to claim 4, characterized in that, The displacement adjustment mechanism (6) includes a guide post (6a), a guide seat (6b) and a clamping bolt (6c). The guide seat (6b) is fixedly installed on the top of the support platform (1). The guide post (6a) and the guide seat (6b) are slidably connected. A threaded plate for the clamping bolt (6c) to engage is fixedly provided on the guide post (6a). A friction plate that contacts the support platform (1) is provided at the bottom of the clamping bolt (6c).

6. The automatic positioning and detection fixture for connecting holes of aircraft structural components according to claim 2, characterized in that, The hole position detection mechanism (5) includes a plug (5a), a distance sensor (5b), an electric push rod (5c), a mounting base (5d), and a lifting slide (5e). The mounting base (5d) is fixedly installed on the rotating frame (4d). The lifting slide (5e) is vertically slidably installed on the mounting base (5d). The electric push rod (5c) is fixedly installed on the mounting base (5d). The output end of the electric push rod (5c) is locked inside the bracket (5f). The bracket (5f) is fixedly connected to the lifting slide (5e). When the lifting slide (5e) stops descending, the output end of the electric push rod (5c) can continue to push downward for a certain distance. The distance sensor (5b) is fixedly installed on the output end of the electric push rod (5c). The detection end of the distance sensor (5b) is in contact with the lifting slide (5e). The plug (5a) is fixedly installed on the bottom of the lifting slide (5e). The bottom of the plug (5a) is provided with an angle (5a1).

7. The automatic positioning and detection fixture for connecting holes of aircraft structural components as described in claim 4, characterized in that, Both sides of the limiting baffle (3a) are provided with slot 1 (3f). Both sides of the limiting baffle (3a) are provided with multiple extension baffles (11) that can be sequentially engaged. Each extension baffle (11) has a block at one end and a slot 2 at the other end. The block can engage with the slot 2. The slot 2 has the same structure as the slot 1 (3f).

8. The automatic positioning and detection fixture for connecting holes of aircraft structural components according to claim 1, characterized in that, Multiple extension flaps (1a) are provided on both sides of the support platform (1). The multiple extension flaps (1a) on each side are hinged to each other, and the extension flaps (1a) closer to the support platform (1) are hinged to the support platform (1).

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