A device for repairing internal splitting cracks in composite material wall panels and its application method

Abstract

This invention relates to the field of aircraft carbon fiber composite panel repair technology, specifically to a device and method for repairing internal splits in composite panel panels. The repair device includes a handheld, visually replaceable, bendable roller brush with adjustable insertion angle and position, and a visual function, used for cleaning, applying adhesive, and repairing the split area on the inside of the composite panel; a handheld, bendable scissors with adjustable insertion angle and position, used for cutting the fiber strips at the split area; and a handheld, bendable clamp with adjustable insertion angle and position, used to clamp the fiber strips at the split area to cooperate with the handheld, bendable scissors for cutting. This invention provides a device and method for repairing internal splits in composite panel panels that is lightweight, portable, and easy to operate, effectively preventing further damage to the damaged area under heavy maneuvering loads and inhibiting damage propagation.

Description

Technical Field

[0001] This invention relates to the field of aircraft carbon fiber composite panel repair technology, specifically to a device for repairing internal splitting cracks in composite panel and its usage method. Background Technology

[0002] As the international situation becomes increasingly volatile, more and more combat-oriented aircraft exercises are being conducted. Artillery shells, as a primary weapon of mass destruction on the battlefield, often cause penetrating damage when they strike aircraft structures at extremely high speeds. Composite material skin panels are made by hot-pressing a single layer of prepreg or resin-impregnated fabric. Page 42 of "Aircraft Structural Battle Damage Repair," published by the National Defense Industry Press in 2007, explains that upon impact, they produce serrated penetrating voids accompanied by delamination around the holes. A 2.3mm diameter bullet penetrating a 5.2mm composite material skin panel will create a 25mm diameter hole with 13mm of undetectable delamination around the hole. The larger the bullet diameter, the thinner the skin panel, and the faster the impact velocity, the larger the damage area. In actual research, high-speed impacts of projectiles on composite material skin panels have also revealed varying degrees of splitting as the projectile penetrates the panel, especially on the back side. Sometimes, fiber bundles also detach, and in some cases, the fiber bundles do not detach completely. Since the impact itself causes microcracks inside the material, if not repaired, the cracks will extend further along the direction of the split fibers during subsequent high-maneuvering flight, causing more extensive structural damage. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention proposes a device for repairing splitting cracks on the inner side of a composite material wall panel and its method of use. It can effectively clean and repair the surface, remove tear damage, reinforce and inhibit crack propagation, and effectively prevent damage to the structure from subsequent high-load flights.

[0004] The technical problem to be solved by this invention is achieved by the following technical solution:

[0005] A device for repairing splits on the inner side of a composite material wall panel, comprising:

[0006] The handheld visual replaceable bending roller brush has adjustable insertion angle and position as well as visual function, and is used for cleaning, applying glue and repairing the split areas on the inside of composite wall panels;

[0007] Handheld bendable scissors with adjustable insertion angle and position, used to cut fiber strips at the split points on the inside of composite material wall panels;

[0008] The handheld bendable clamp has adjustable insertion angle and position, and is used to clamp the fiber strips at the split point on the inside of the composite material wall panel, so as to cooperate with the handheld bendable scissors for cutting.

[0009] Preferably, the handheld visual replaceable bending roller brush includes a display, a connector, a first gooseneck tube connected to the upper end of the connector, a miniature camera disposed at the front end of the connector, and a brush holder connected to the lower end of the connector. A first handle is disposed at the top of the first gooseneck tube, a data cable is connected between the miniature camera and the display, and a brush head is disposed on the brush holder.

[0010] Preferably, the display is provided with an operation panel and a power switch.

[0011] Preferably, the first gooseneck tube and the connecting port are respectively provided with fixing buckles for fixing the miniature camera and the data cable.

[0012] Preferably, the handheld bendable scissors include a second gooseneck tube, a second handle connected to the top of the second gooseneck tube via a first connecting nut, and straight scissors connected to the bottom of the second gooseneck tube via a first connecting port. The second gooseneck tube is a hollow tubular structure, and a first traction line is provided inside the second gooseneck tube, with one end connected to the second handle and the other end connected to the straight scissors.

[0013] Preferably, the handheld bendable clamp includes a third gooseneck tube, a third handle connected to the top of the third gooseneck tube via a second connecting nut, and a clamping head connected to the bottom of the third gooseneck tube via a second connecting port. The interior of the third gooseneck tube is provided with a second traction line, one end of which is connected to the third handle and the other end of which is connected to the clamping head.

[0014] A method of using a composite material wall panel inner side splitting repair device, comprising the following steps:

[0015] Step (1) Visually identify the location of penetrating damage on the skin panel, use ultrasonic non-destructive testing to mark the location of delamination damage near the penetrating damage, and then grind away the damage in the marked area to form an operating hole.

[0016] Step (2) Insert the miniature camera into the structure through the operating hole to find the location and size of the splitting damage, and mark the direction of the splitting damage on the outside of the wall panel with a marker.

[0017] Step (3) Insert the clamping head on the hand-held bendable clamp into the operating hole, clamp the detached fiber strip, adjust the bending angle of the hand-held bendable scissors, insert the hand-held bendable scissors into the operating hole, reach the position of the clamping head on the hand-held bendable clamp, and cut the split and detached fiber strip.

[0018] Step (4) Remove the fiber strip using a handheld bendable clamp and measure the length of the longest fiber strip. Remove the miniature camera and the handheld bendable scissors.

[0019] Step (5) Insert the handheld visual replacement bendable roller brush into the operating hole, adjust the lens angle and the bending angle of the roller brush handle, absorb and wipe away the split damage and surrounding oil stains, and clean until no oil stains are visible on the roller brush.

[0020] Step (6) Replace the brush head on the handheld visual replaceable bending roller brush, dip it in acetone to clean the split area a second time, and clean the surface again with compressed air or a hair dryer.

[0021] Step (7) Prepare the quick-drying adhesive. Replace the brush head of the handheld visual replaceable bending roller brush again, dip it in the quick-drying adhesive and brush it onto the surface.

[0022] Step (8) Replace the brush head and replace the fiberglass fabric roll. Lay a layer of fabric from the starting point of the adhesive to the edge of the hole.

[0023] Step (nine): Replace the PTFE rollers and compact the fabric;

[0024] Step (10) Use infrared drying lamps, hot air blowers, etc. to heat the outside of the wall panel, with the temperature not exceeding 50℃;

[0025] Step (xi) Use composite materials or metal patches to seal the opening area.

[0026] Preferably, the diameter of the operating hole in step (i) is generally not less than 50 mm. If the diameter of the marked damage is less than 50 mm, the hole needs to be enlarged; if it is greater than 50 mm, the operating hole is machined according to the actual size of the damage.

[0027] Preferably, in step (v), the cleaning length should be 5cm longer than the length of the split and the width should be 10cm longer than the width of the split.

[0028] Preferably, the performance of the quick-drying adhesive in step (vii) should meet the following requirements: curing temperature not higher than 50℃, surface drying time not greater than 30 minutes, complete curing time not higher than 8 hours, pot life not less than 15 minutes, and adhesive viscosity sufficient to prevent dripping when dipped.

[0029] The beneficial effects of this invention are:

[0030] This invention provides a device for repairing internal splitting of composite material panels and its usage method. It is lightweight, portable, and easy to operate, which solves the problem of further damage to damaged areas caused by high maneuver loads, effectively inhibits damage propagation, and ensures the completion of flight missions. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0032] Figure 1 This is a schematic diagram of the main structure of the handheld visual bending roller brush of the present invention;

[0033] Figure 2 This is a schematic diagram of the left-side structure of the handheld visual bending roller brush of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of the handheld bendable scissors of the present invention;

[0035] Figure 4 This is a schematic diagram of the structure of the handheld bendable clamp of the present invention;

[0036] Figure 5 This is a repair flowchart for the present invention;

[0037] Figure 6 for Figure 5 Schematic diagram at point A in the diagram;

[0038] Figure 7 for Figure 5 Schematic diagram at point B in the diagram;

[0039] Figure 8 for Figure 5 The diagram at point C in the diagram.

[0040] In the diagram: 1. Handheld visual replaceable bending roller brush; 11. Display; 12. Control panel; 13. Power switch; 14. First handle; 15. First gooseneck tube; 16. Fixing buckle; 17. Connection port; 18. Miniature camera; 19. Brush holder; 110. Cover; 111. Brush head; 112. Data cable; 2. Handheld bendable scissors; 21. Second handle; 22. First connecting nut; 23. Second gooseneck tube; 24. First connection port; 25. Straight scissors; 26. First traction line; 3. Handheld bendable clamp; 31. Third handle; 32. Second connecting nut; 33. Third gooseneck tube; 34. Second connection port; 35. Clamping head; 36. Second traction line. Detailed Implementation

[0041] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0042] A device for repairing splits on the inner side of a composite material wall panel includes three parts: a handheld visual replaceable bending roller brush 1, a handheld bendable scissors 2, and a handheld bendable clamp 3.

[0043] like Figure 1 and Figure 2As shown, the handheld visual replaceable bending roller brush 1 consists of a display 11, an operation panel 12, a power switch 13, a first handle 14, a first gooseneck tube 15, a fixing buckle 16, a connection port 17, a miniature camera 18, a brush holder 19, a mouth cover 110, a brush head 111, and a data cable 112.

[0044] The first handle 14 is located at the top of the first gooseneck tube 15 and is threaded to the top of the first gooseneck tube 15. The bottom of the first gooseneck tube 15 is threaded to the upper end of the connection port 17. The first gooseneck tube 15 is used to change and fix the angle and position of the roller brush inserted into the inner wall. The fixing buckle 16 is connected to the first gooseneck tube 15 and the connection port 17 to fix the miniature camera 18 and the data cable 112. The fixing buckle 16 for fixing the miniature camera 18 can be opened, so that the miniature camera 18 can be separated from the handheld visual replaceable bending roller brush 1. The miniature camera 18 is used independently as an endoscope. The miniature camera 18 is connected to the display 11 via the data cable 112 to transmit the observed images. The operation panel 12 and the power switch 13 are correspondingly set on the display 11. The operator can control the first gooseneck tube 15 to operate in a timely manner through the operation panel 12 and the display 11.

[0045] The brush holder 19 is connected to the bottom of the connection port 17, and the brush holder 19 can be disassembled through the connection port 17. The inner cylinder of the brush head 111 is hollow, and the side wall is connected to the cap 110 by threads. It is possible to choose whether to fill it with glue according to the actual situation. After filling with glue, tightening it can close the cylinder. The cylinder of the brush head 111 is made of tough plastic material and has small holes. By squeezing, the liquid inside the cylinder can flow out while avoiding permanent deformation of the cylinder. There is no brush cloth on the cylinder.

[0046] like Figure 3 As shown, the handheld bendable scissors 2 mainly consists of a second handle 21, a first connecting nut 22, a second gooseneck tube 23, a first connecting port 24, straight scissors 25, and a first traction line 26.

[0047] The second handle 21 controls the opening and closing of the blade of the straight scissors 25, thereby performing a cutting operation. The second handle 21 is connected to the top of the second gooseneck tube 23 through the first connecting nut 22. The second gooseneck tube 23 is used to change and fix the angle and position of the scissors extending into the inner wall. It is a hollow structure in which the first traction line 26 is placed. One end of the first traction line 26 is connected to the second handle 21, and the other end is connected to the straight scissors 25. The straight scissors 25 consists of two metal pieces with one sharp end. The two metal pieces are fixed with screws and connected to the second gooseneck tube 23 through the first connecting port 24. The first traction line 26 is connected to the fixing bolt. The opening and closing of the blade is controlled by rotating the bolt.

[0048] like Figure 4 As shown, the handheld bendable clamp 3 mainly consists of a third handle 31, a second connecting nut 32, a third gooseneck tube 33, a second connecting port 34, a clamping head 35, and a second traction line 36.

[0049] The third handle 31 controls the opening and closing of the clamping head 35 for clamping operations. The third handle 31 is connected to the top of the third gooseneck tube 33 via the second connecting nut 32. The third gooseneck tube 33 is used to change and fix the angle and position of the clamping head 35 extending into the inner wall. It is a hollow structure in which the second traction line 36 is placed. One end of the second traction line 36 is connected to the third handle 31, and the other end is connected to the clamping head 35. The clamping head 35 consists of two metal blocks with serrated end faces. The two metal blocks are fixed with bolts and connected to the third gooseneck tube 33 via the second connecting port 34. The second traction line 36 is connected to the fixing bolts, and the opening and closing of the clamping port is controlled by rotating the bolts.

[0050] like Figures 5 to 8 As shown, a method for using a composite material wall panel inner side splitting repair device includes the following steps:

[0051] Step (1) Visually identify the location of penetrating damage on the skin panel. Use ultrasonic non-destructive testing to mark the location of layered damage near the penetrating damage and mark it. Grind away the damage in the marked area to form an operating hole. The diameter of the operating hole is generally not less than 50mm. If the diameter of the marked damage is less than 50mm, the hole needs to be enlarged; if it is greater than 50mm, the operating hole is processed according to the actual size of the damage.

[0052] Step (2) Insert the miniature camera 18 into the structure through the operating hole to find the location and size of the splitting damage, and mark the direction of the splitting damage on the outside of the wall panel with a marker.

[0053] Step (3) Insert the clamping head 35 on the handheld bendable clamp 3 into the operating hole to clamp the detached fiber strip. Adjust the bending angle of the handheld bendable scissors 2 and insert the handheld bendable scissors 2 into the operating hole until it reaches the position of the clamping head 35 on the handheld bendable clamp 3 and cut the split and detached fiber strip.

[0054] Step (4) Take out the fiber strip using the handheld bendable clamp 3, measure the length of the longest fiber strip, and take out the miniature camera 18 and the handheld bendable scissors 2.

[0055] Step (5): Insert the handheld visual replaceable bending roller brush 1 into the operating hole, adjust the lens angle and the bending angle of the brush handle, and absorb and wipe away the split damage and surrounding oil stains until no oil stains are visible on the roller brush. The cleaning length should be at least 5cm longer than the length of the split and the width should be at least 10cm longer than the width of the split.

[0056] Step (six): Replace the brush head 111 on the handheld visual replaceable bending roller brush 1, apply acetone to the split area for secondary cleaning, and clean the surface again with compressed air or a hair dryer.

[0057] Step (7) Prepare the quick-drying adhesive. Replace brush head 111 with the handheld visual replaceable bending roller brush 1, dip it into the quick-drying adhesive, and brush it onto the surface. The performance of the quick-drying adhesive must meet the following requirements: curing temperature not higher than 50℃, surface drying time not greater than 30 minutes, complete curing time not greater than 8 hours, pot life not less than 15 minutes, and adhesive viscosity sufficient to prevent dripping when dipped into the roller brush.

[0058] Step (8) Replace the brush head and replace the fiberglass fabric roll. Lay a layer of fabric from the starting point of the adhesive to the edge of the hole.

[0059] Step (9) Replace the PTFE rollers and compact the fabric.

[0060] Step (10) Use infrared drying lamps, hot air blowers, etc. to heat the outside of the wall panel, with the temperature not exceeding 50℃;

[0061] Step (xi) Seal the opening area using composite materials or metal patches. Specifically, sealing methods include adhesive bonding or mechanical connection. However, it is important to note that when repairing mechanical connections, drilling or riveting should be avoided at the split location.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely prisms of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A device for repairing splitting cracks on the inner side of a composite material wall panel, characterized in that: include: A handheld visual replaceable bending roller brush (1) has adjustable insertion angle and position as well as visual function, and is used for cleaning, applying glue and repairing the split part on the inside of composite wall panel; Handheld bendable scissors (2) with adjustable insertion angle and position, used to cut fiber strips at the split point on the inside of composite wall panels; The handheld bendable clamp (3) has adjustable insertion angle and position and is used to clamp the fiber strips at the split part of the inner side of the composite material wall panel so as to cut them in conjunction with the handheld bendable scissors (2).

2. The composite material wall panel inner side splitting repair device according to claim 1, characterized in that: The handheld visual replaceable bending roller brush (1) includes a display (11), a connector (17), a first gooseneck tube (15) connected to the upper end of the connector (17), a miniature camera (18) disposed at the front end of the connector (17), and a brush holder (19) connected to the lower end of the connector (17). A first handle (14) is disposed at the top of the first gooseneck tube (15). A data cable (112) is connected between the miniature camera (18) and the display (11). A brush head (111) is disposed on the brush holder (19).

3. The composite material wall panel inner side splitting repair device according to claim 2, characterized in that: The display (11) is equipped with an operation panel (12) and a power switch (13).

4. The composite material wall panel inner side splitting repair device according to claim 2, characterized in that: The first gooseneck tube (15) and the connecting port (17) are respectively provided with fixing buckles (16) for fixing the miniature camera (18) and the data cable (112).

5. The composite material wall panel inner side splitting repair device according to claim 1, characterized in that: The handheld bendable scissors (2) includes a second gooseneck tube (23), a second handle (21) connected to the top of the second gooseneck tube (23) via a first connecting nut (22), and a straight scissor (25) connected to the bottom of the second gooseneck tube (23) via a first connecting port (24). The second gooseneck tube (23) is a hollow tubular structure. Inside the second gooseneck tube (23) is a first traction line (26) with one end connected to the second handle (21) and the other end connected to the straight scissor (25).

6. The composite material wall panel inner side splitting repair device according to claim 1, characterized in that: The handheld bendable clamp (3) includes a third gooseneck tube (33), a third handle (31) connected to the top of the third gooseneck tube (33) via a second connecting nut (32), and a clamping head (35) connected to the bottom of the third gooseneck tube (33) via a second connecting port (34). The interior of the third gooseneck tube (33) is provided with a second traction line (36) with one end connected to the third handle (31) and the other end connected to the clamping head (35).

7. A method of using a composite material wall panel inner side splitting repair device, characterized in that: The composite material wall panel inner splitting repair device according to any one of claims 1 to 6 includes the following steps: Step (1) Visually identify the location of penetrating damage on the skin panel, use ultrasonic non-destructive testing to mark the location of delamination damage near the penetrating damage, and then grind away the damage in the marked area to form an operating hole. Step (2) Insert the miniature camera (18) into the structure through the operating hole to find the location and size of the splitting damage, and mark the direction of the splitting damage extension on the outside of the wall panel with a marker. Step (3) Insert the clamping head (35) on the hand-held bendable clamp (3) into the operating hole, clamp the detached fiber strip, adjust the bending angle of the hand-held bendable scissors (2), insert the hand-held bendable scissors (2) into the operating hole, reach the position of the clamping head (35) on the hand-held bendable clamp (3), and cut the split and detached fiber strip. Step (4) Take out the fiber strip using a handheld bendable clamp (3) and measure the length of the longest fiber strip. Take out the miniature camera (18) and the handheld bendable scissors (2). Step (5) Insert the handheld visual replacement bending roller brush (1) into the operating hole, adjust the lens angle and the bending angle of the roller brush handle, absorb and wipe away the split damage and the surrounding oil stains, and clean until the oil stains are no longer visible on the roller brush. Step (six): Replace the brush head (111) on the handheld visual replaceable bending roller brush (1), dip it in acetone to clean the split area a second time, and clean the surface again with compressed air or a hair dryer. Step (7) Prepare the quick-drying adhesive. Replace the brush head (111) with the handheld visual replaceable bending roller brush (1) again, dip it in the quick-drying adhesive and brush it onto the surface. Step (8) Replace the brush head and replace the fiberglass fabric roll. Lay a layer of fabric from the starting point of the adhesive to the edge of the hole. Step (nine): Replace the PTFE rollers and compact the fabric; Step (10) Use infrared drying lamps, hot air blowers, etc. to heat the outside of the wall panel, with the temperature not exceeding 50℃; Step (xi) Use composite materials or metal patches to seal the opening area.

8. The method of using the composite material wall panel inner side splitting repair device according to claim 7, characterized in that: In step (1), the diameter of the operating hole is generally not less than 50mm. If the diameter of the marked damage is less than 50mm, the hole needs to be enlarged; if it is greater than 50mm, the operating hole is machined according to the actual size of the damage.

9. The method of using the composite material wall panel inner side splitting repair device according to claim 7, characterized in that: In step (5), the cleaning length should be 5cm longer than the length of the split and the width should be 10cm longer than the width of the split.

10. The method of using the composite material wall panel inner side splitting repair device according to claim 7, characterized in that: Step (7) The performance of the quick-drying adhesive must meet the following requirements: curing temperature not higher than 50℃, surface drying time not greater than 30 minutes, complete curing time not higher than 8 hours, pot life not less than 15 minutes, and adhesive viscosity sufficient to prevent dripping when dipped.

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