A method and tooling for repairing dents in aircraft flared combination ducts

Abstract

This application belongs to the field of aircraft duct repair technology, specifically relating to a method and tooling for repairing dents in aircraft flared-type combined ducts. It includes a connecting cylinder and a collecting cylinder. Several steel balls are arranged side-by-side inside the connecting cylinder. The diameter and number of steel balls are determined based on the inner diameter of the flared-type combined duct and the deepest point L of the dent. The inner diameters of the connecting cylinder and the collecting cylinder are set to be the same as the inner diameter of the flared-type combined duct. This method solves the problem of dent repair in flared-type combined ducts. It is applicable to dent repair of flared-type combined ducts with various inner diameters and complex shapes. It can be operated by one person and is simple to use. It saves time and labor, and the repaired flared-type combined duct meets usage requirements. This design can also be used to repair the roundness of flared-type combined ducts. Furthermore, by using steel balls of increasing size sequentially to repair the dent, excessive stress on the dent can be effectively prevented.

Description

Technical Field

[0001] This application belongs to the field of aircraft duct repair technology, and specifically relates to a method and tooling for repairing dents in aircraft flared combination ducts. Background Technology

[0002] Aircraft hydraulic systems, environmental control systems, liquid cooling systems, life-saving systems, power systems, fire suppression systems, and fuel systems all require flared combination conduits for connection. The structural form of the flared combination conduit is as follows: Figure 1 As shown, it consists of an outer nut, a flat nozzle, and a tube. Because the internal space of an aircraft is limited, the structure of the tube is complex in shape and has many bends, depending on the installation requirements of various products on the aircraft. A single aircraft requires hundreds of different types of flared combination conduits.

[0003] Flared-end ductwork is secured in aircraft with clamps. Due to vibrations during flight, some flared-end ductwork may develop dents at the contact points with the clamps. Furthermore, the confined space inside an aircraft can also cause dents in individual flared-end ductwork during installation and disassembly.

[0004] During aircraft repair, all flared-end ductwork needs to be disassembled for repair. Currently, the method for repairing dents in flared-end ductwork involves inserting a liner into the dented area on the inner wall of the ductwork and using an aluminum hammer to evenly tap around the dent to restore it to its original shape. This method requires a high level of operator skill and can only repair dents near the ends of the ductwork, as the liner cannot penetrate deeply at bends, leaving no point of impact for tapping. Furthermore, this method can only repair flared-end ductwork with an inner diameter greater than 30mm, making it highly limited. For dents that cannot be repaired, manufacturing a new flared-end ductwork for replacement is necessary, which is costly.

[0005] Therefore, a new method is needed to repair the depressions in flared combination catheters. Summary of the Invention

[0006] The purpose of this application is to provide a method and tooling for repairing dents in aircraft flared combination catheters, in order to solve the problem that existing methods cannot effectively repair dents at both ends of flared combination catheters.

[0007] This application provides a method for repairing the depression of an aircraft flared combined duct, including:

[0008] Set up a connecting tube and a collecting tube. Place several steel balls side by side inside the connecting tube. The diameter and number of steel balls are determined according to the inner diameter of the flared combined conduit and the size L of the deepest recess. Set the inner diameter of the connecting tube and the collecting tube to be the same as the inner diameter of the flared combined conduit.

[0009] The connecting tube and the collecting tube are respectively connected to both ends of the flared-end combined conduit and are internally connected; the steel ball at the outer end of the connecting tube is controlled to slide and seal with the connecting tube and the flared-end combined conduit; the steel ball is able to contact the concave inner wall spherical surface of the flared-end combined conduit; the outer end of the connecting tube is the end away from the flared-end combined conduit.

[0010] Lubricating oil is introduced into the outer end of the connecting cylinder to drive the steel balls to roll inside the connecting cylinder, the flared combined conduit, and the collecting cylinder. During the rolling process, the lubricating oil is in a sealed state. When the steel balls roll to the depression, the hydraulic oil impacts the steel balls to repair the depression from the inside out. The repair is completed when all the steel balls have passed the depression.

[0011] Preferably, the diameter of different steel balls gradually decreases from the outer end of the connecting cylinder to the end connected to the flared combined conduit; the diameter of the largest steel ball is the same as the inner diameter of the flared combined conduit.

[0012] Preferably, a smoothing repair threshold is set, the size L is divided by the smoothing repair threshold and rounded up to obtain the number of steel balls; then the diameter of each steel ball is determined in descending order according to the smoothing repair threshold.

[0013] Preferably, the specific method for repairing the dent from the inside out is as follows: connect the connecting cylinder to the output end of the hydraulic test bench, and place the collecting cylinder into the oil tank; turn on the hydraulic test bench switch, and control the hydraulic oil to impact the steel balls from one end of the flared-type combined conduit to the other end, so that the steel balls reach and pass through the dented inner wall of the flared-type combined conduit in sequence until the dent repair is completed; after the dent repair is completed, turn off the switch and disassemble the flared-type combined conduit.

[0014] Preferably, after the connecting cylinder and the collecting cylinder are connected to the two ends of the flared-end combined conduit, the steel ball is placed on the rear of the recess and kept stationary. Gas at a certain pressure is introduced into the outer end of the connecting cylinder, and then an ultrasonic leak detector is set behind the recess to detect leakage. If no leakage is detected, it indicates that the sealing between the connecting cylinder and the flared-end combined conduit is good.

[0015] The second aspect of this application provides a tooling for repairing dents in an aircraft flared combination conduit, including a connecting cylinder, steel balls, and a collecting cylinder; the connecting cylinder is a cylindrical component, with its outer end threaded to the output end of a hydraulic test bench and its inner end threaded to one end of the flared combination conduit; there are multiple steel balls with decreasing diameters in sequence, the largest steel ball having the same inner diameter as the connecting cylinder and the collecting cylinder; the inner end of the collecting cylinder is threaded to the other end of the flared combination conduit, and its outer end has a through hole, the through hole of which is located inside an oil trough.

[0016] This application discloses a method and tooling for repairing dents in aircraft-type flared combination catheters, solving the problem of dent repair for such catheters. This invention is applicable to dent repair of flared combination catheters with various inner diameters and complex shapes. It can be operated by a single person and is simple to use. It saves time and labor, and the repaired flared combination catheter meets usage requirements. This design can also be used to repair the roundness of flared combination catheters. Furthermore, by using steel balls of progressively larger sizes to repair the dent, excessive stress on the dent can be effectively prevented. Attached Figure Description

[0017] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0018] Figure 1 This is a schematic diagram in the background art;

[0019] Figure 2 This is a schematic diagram of the connection structure between the connecting tube and the collecting tube and the flared combined conduit of this application;

[0020] Figure 3 This is a schematic diagram of the dent repair of the flared combination catheter of this application.

[0021] In the diagram, 1 is the connecting tube; 2 is the steel ball; 3 is the collecting tube; and 4 is the flared combination conduit. Detailed Implementation

[0022] 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.

[0023] Example 1: A method for repairing depressions in aircraft flared combination catheters, combined with... Figure 2 It includes the following steps:

[0024] Step S100: Measure the dimension L of the deepest recess of the flared combined catheter 4;

[0025] Step S200: Set up connecting cylinder 1 and collecting cylinder 3. Place several steel balls 2 side by side in connecting cylinder 1. The diameter and number of steel balls 2 are determined according to the inner diameter of the flared combined conduit 4 and the size L of the deepest recess. Set the inner diameter of connecting cylinder 1 and collecting cylinder 3 to be the same as the inner diameter of flared combined conduit 4.

[0026] Preferably, the diameter and number of steel balls 2 are determined as follows: a smoothing repair threshold is set, the size L is divided by the smoothing repair threshold and rounded up to obtain the number of steel balls 2; then, the diameter of each steel ball 2 is determined in descending order according to the smoothing repair threshold; all steel balls 2 are placed into the connecting tube 1 on the left in descending order of diameter; the diameter of the largest steel ball 2 is the same as the inner diameter of the flared combined conduit 4.

[0027] like Figure 3 By using multiple steel balls of different diameters, the dent can be repaired in sections, thus avoiding excessive repair work, which could cause excessive stress on the dent and lead to cracks or damage.

[0028] The smoothness repair threshold determines the smoothness of the dent repair. The more steel balls 2 there are, the less steel balls pass through the dent repair each time. However, if there are too many, the positional stability between steel balls 2 will be poor. Therefore, setting an appropriate smoothness repair threshold determines the smoothness of the dent repair.

[0029] In a specific example, the inner diameter of the flared combination catheter 4 is 16 mm, the measured deepest depression is 1 mm, the smooth repair threshold is 0.3, and the calculation... The number of steel balls N is 3 + 1 = 4. The largest steel ball 2 has a diameter of 16mm; the size of the subsequent steel balls 2 decreases by 0.3mm, to 15.7mm, 15.4mm, and 15.1mm respectively.

[0030] In step S300, the connecting cylinder 1 and the collecting cylinder 3 are respectively connected to both ends of the flared-end combined conduit 4 and are internally connected; the steel ball 2 at the outer end of the connecting cylinder 1 is controlled to slide and seal with the connecting cylinder 1 and the flared-end combined conduit 4, that is, the steel ball 2 is always in a closed state with its driving part during the rolling process, ensuring the stability after the lubricating oil is introduced; the steel ball 2 can contact the concave inner wall spherical surface of the flared-end combined conduit 4; the outer end of the connecting cylinder 1 is the end away from the flared-end combined conduit 4.

[0031] To ensure a tight seal, a sealing test is conducted after installation. Specifically, after connecting the connecting cylinder 1 and collecting cylinder 3 to both ends of the flared-end combined conduit 4, the steel ball 2 is placed against the back of the recess and held stationary. Gas at a certain pressure is introduced into the outer end of the connecting cylinder 1, and then an ultrasonic leak detector is set up behind the recess to detect any leaks. If no leak is detected, it indicates that the seal between the connecting cylinder 1 and the flared-end combined conduit 4 is good.

[0032] In step S400, lubricating oil is introduced into the outer end of the connecting cylinder 1 to drive the steel ball 2 to roll inside the connecting cylinder 1, the flared combined conduit 4, and the collecting cylinder 3. During the rolling, the lubricating oil is in a sealed state. When the steel ball 2 rolls to the depression, the hydraulic oil impacts the steel ball 2 to repair the depression from the inside out. When all the steel balls 2 have passed the depression, the repair is completed.

[0033] Preferably, the left end of the connecting cylinder 1 is connected to the output end of the hydraulic test bench, and the right end is connected to the left end of the flared-end combined conduit 4. The collecting cylinder 3 is connected to the right end of the flared-end combined conduit 4, and one end of the collecting cylinder 3 is placed in the oil tank to facilitate the collection of hydraulic oil.

[0034] Start the hydraulic test bench, increase the hydraulic pressure to 5MPa, turn on the switch, and apply pressure to the steel ball 2 through the hydraulic oil. The steel ball 2 will impact the left end to the right end of the flared-type combined conduit 4 in sequence, so that the steel ball 2 will reach and pass through the concave inner wall of the flared-type combined conduit 4 in sequence, and gradually complete the repair of the concave.

[0035] After the dent is repaired, turn off the switch and disassemble the flared combination catheter 4.

[0036] The above design solves the problem of dent repair for flared combination catheters 4. It is applicable to dent repair of flared combination catheters 4 with various inner diameters and complex shapes. It can be operated by one person and is simple to use. It saves time and effort, and the repaired flared combination catheter 4 meets usage requirements. This design can also be used to repair the roundness of flared combination catheters 4. Furthermore, by using steel balls 2 of increasing size sequentially to repair the dent, excessive stress on the dent can be effectively prevented.

[0037] Example 2: A tooling for repairing dents in an aircraft flared-end combined conduit includes a connecting cylinder 1, steel balls 2, and a collecting cylinder 3. The connecting cylinder 1 is a cylindrical component, with its outer end threaded to the output end of a hydraulic test bench and its inner end threaded to one end of a flared-end combined conduit 4. There are multiple steel balls 2 with decreasing diameters, and the largest steel ball 2 has the same inner diameter as the connecting cylinder 1 and the collecting cylinder 3. The inner end of the collecting cylinder 3 is threaded to the other end of the flared-end combined conduit 4, and its outer end has a through hole located inside an oil trough.

[0038] The collecting cylinder 3 can tighten the steel balls 2, preventing them from bursting out due to hydraulic pressure and causing injury. When all the steel balls 2 enter the collecting cylinder 3 through the recess, the hydraulic oil can leak from the through hole, preventing excessive hydraulic pressure from damaging the flared combination conduit 4.

[0039] Steel ball 2 is made of bearing steel with a hardness of HRC58-62 and chrome-plated surface; the outer surface of the left end of the connecting cylinder 1 has an external hexagonal structure, which facilitates tightening of the connecting cylinder 1; the outer right side of the connecting cylinder 1 has a 74° external thread, which connects with the internal thread of the outer nut on the left side of the flared combination conduit 4; there is a long hole inside the right side with a diameter of dN+0.1mm, where N is the number of steel balls 2.

[0040] Finally, it should be noted that the accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0041] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for repairing depressions in aircraft flared combination ducts, characterized in that, include: Set up a connecting tube (1) and a collecting tube (3). Place several steel balls (2) side by side in the connecting tube (1). The diameter and number of steel balls (2) are determined according to the inner diameter of the flared combined conduit and the size L of the deepest recess. Set the inner diameter of the connecting tube (1) and the collecting tube (3) to be the same as the inner diameter of the flared combined conduit (4). Connect the connecting tube (1) and the collecting tube (3) to both ends of the flared-end combined conduit (4) respectively, and make them internally connected; control the steel ball (2) at the outer end of the connecting tube (1) to slide and seal with the connecting tube (1) and the flared-end combined conduit (4); the steel ball (2) can contact the concave inner wall spherical surface of the flared-end combined conduit (4); the outer end of the connecting tube (1) is the end away from the flared-end combined conduit (4); Hydraulic oil is introduced into the outer end of the connecting cylinder (1) to drive the steel ball (2) to roll in the connecting cylinder (1), the flared combined conduit (4) and the collecting cylinder (3). During the rolling, the hydraulic oil is in a sealed state. When the steel ball (2) rolls to the depression, the hydraulic oil impacts the steel ball (2) to repair the depression from the inside out. When all the steel balls (2) have passed the depression, the repair is completed. The diameter of different steel balls (2) gradually decreases from the outer end of the connecting tube (1) to the end connected to the flared combination conduit (4); the diameter of the largest steel ball (2) is the same as the inner diameter of the flared combination conduit (4).

2. The method for repairing aircraft flared combined conduit depressions as described in claim 1, characterized in that: Set a smoothing repair threshold, divide the size L by the smoothing repair threshold and round up to get the number of steel balls (2); then determine the diameter of each steel ball (2) in descending order according to the smoothing repair threshold.

3. The method for repairing aircraft flared combined conduit depressions as described in claim 1, characterized in that, The specific method for repairing the dent from the inside out is as follows: connect the connecting cylinder (1) to the output end of the hydraulic test bench and place the collecting cylinder (3) into the oil tank; turn on the hydraulic test bench switch and control the hydraulic oil to impact the steel ball (2) from one end of the flared combined conduit (4) to the other end, so that the steel ball (2) reaches and passes through the dented inner wall of the flared combined conduit (4) in sequence until the dent repair is completed; after the dent repair is completed, turn off the switch and disassemble the flared combined conduit (4).

4. The method for repairing aircraft flared combined conduit depressions as described in claim 1, characterized in that: After the connecting cylinder (1) and the collecting cylinder (3) are connected to the two ends of the flared combined conduit (4), the steel ball (2) is placed against the back of the recess and left stationary. Gas of a certain pressure is introduced into the outer end of the connecting cylinder (1), and then an ultrasonic leak detector is set behind the recess to detect leakage. If no leakage is detected, it indicates that the sealing between the connecting cylinder (1) and the flared combined conduit (4) is good.

5. A tooling for repairing dents in aircraft flared combination conduits, employing the method described in any one of claims 1-4, characterized in that: It includes a connecting cylinder (1), steel balls (2) and a collecting cylinder (3); the connecting cylinder (1) is a cylindrical part, the outer end of the connecting cylinder (1) is threaded to the output end of the hydraulic test bench, and the inner end is threaded to one end of the flared combined conduit (4); there are multiple steel balls (2) with decreasing diameters in sequence, and the steel ball (2) with the largest diameter has the same inner diameter as the connecting cylinder (1) and the collecting cylinder (3); the inner end of the collecting cylinder (3) is threaded to the other end of the flared combined conduit (4), and the outer end is provided with a through hole, and the through hole of the collecting cylinder (3) is located in the oil tank.

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