Method and tool for repairing sunken part of flared combined guide pipe of airplane

Abstract

The invention belongs to the technical field of aircraft guide pipe repairing, and particularly relates to an aircraft flaring type combined guide pipe recess repairing method and tool. A connecting cylinder and a collecting cylinder are arranged, a plurality of steel balls are arranged in the connecting cylinder side by side, and the diameter and number of the steel balls are determined according to the inner diameter of a flaring type combined guide pipe and the size L of the deepest recess; the inner diameter of the connecting cylinder and the inner diameter of the collecting cylinder are set to be the same as the inner diameter of the flaring type combined guide pipe. The problem of sunken part repairing of the flaring type combined guide pipe is solved. The device is simple in structure and convenient to operate, can be suitable for pit repair of flaring type combined conduits with various inner diameters and pit repair of flaring type combined conduits with various complex shapes, can be operated by one person, and is easy to operate. Time and labor are saved, and the repaired flaring type combined guide pipe meets the use requirement. The design can also be used for repairing the roundness of the flaring type combined guide pipe. And the steel balls from small to large are used for sequentially repairing the sunken part, so that the sunken part can be effectively prevented from being stressed excessively.

Description

Technical Field

[0001] The present application belongs to the technical field of aircraft duct repair, and in particular relates to a method and tooling for repairing a dent in an aircraft flared combined duct. Background Art

[0002] The hydraulic system, environmental control system, liquid cooling system, life-saving system, power system, fire extinguishing system and fuel system on the aircraft all need flared combined conduits for connection. The structural form of flared combined conduits is as follows: Figure 1 As shown, it consists of an outer sleeve nut, a flat nozzle, and a tube. Due to the limited space inside the aircraft, the structure of the tube is based on the installation requirements of various products on the aircraft. The shape is complex and there are many bends. An aircraft requires hundreds of flared combination ducts.

[0003] Flared ducts are secured to aircraft with clamps. Due to aircraft vibration during flight, some ducts may dent where they meet the clamps. Due to the cramped interior of an aircraft, installation and disassembly of ducts can also cause dents on some tubes.

[0004] During aircraft repairs, all flared composite ducts must be disassembled for repair. Currently, dents in flared composite ducts are repaired by inserting a lining rod into the dented inner wall of the duct and evenly striking the area around the dent with an aluminum hammer to restore it to its original shape. This method requires extremely high operator skill and can only repair dents near the ends of the duct. The lining rod cannot penetrate deeply at the bend of the duct, leaving no force points for striking. Furthermore, this method can only repair ducts with an inner diameter greater than 30 mm, resulting in significant limitations. For dents that cannot be repaired, new ducts are manufactured and replaced, which is costly.

[0005] Therefore need a kind of new method to repair the depression of flared type combination conduit. Summary of the Invention

[0006] The purpose of this application is to provide a method and tooling for repairing dents in an aircraft flared combined duct, so as to solve the problem that existing methods cannot effectively repair the dents outside the two ends of the flared combined duct.

[0007] On one hand, the present application provides a method for repairing a dent in an aircraft flared combined duct, comprising: A connecting tube and a collecting tube are provided, and a number of steel balls are placed side by side in the connecting tube. The diameter and number of the steel balls are determined according to the inner diameter of the flared combined conduit and the dimension L of the deepest part of the recess. The inner diameters of the connecting tube and the collecting tube are set to be the same as the inner diameter of the flared combined conduit. The connecting tube and the collecting tube are respectively connected to the two ends of the flared 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 combined conduit; the steel ball is able to contact the spherical surface of the concave inner wall of the flared combined conduit; the outer end of the connecting tube is the end away from the flared combined conduit; Lubricating oil is introduced into the outer end of the connecting cylinder to drive the steel balls to roll in the connecting cylinder, the flared combined duct and the collecting cylinder. The lubricating oil is in a sealed state during the rolling period. When the steel balls roll to the depression, the hydraulic oil impacts the steel balls to repair the depression from the inside out. When all the steel balls have passed through the depression, the repair is completed.

[0008] Preferably, the diameters of the different steel balls gradually decrease from the outer end of the connecting tube 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.

[0009] Preferably, a smooth repair threshold is set, the size L is divided by the smooth repair threshold and the number of steel balls is obtained by rounding up; and then the diameter of each steel ball is determined in descending order according to the smooth repair threshold.

[0010] Preferably, the specific method of repairing the dent from the inside out is: connecting the connecting tube to the output end of the hydraulic test bench and placing the collecting tube into the oil tank; turning on the hydraulic test bench switch, controlling the hydraulic oil to impact the steel balls from one end of the flared combination conduit to the other end, so that the steel balls reach and pass through the inner wall of the dent of the flared combination conduit in turn until the dent is repaired; after the dent is repaired, turning off the switch and disassembling the flared combination conduit.

[0011] Preferably, after the connecting tube and the collecting tube are respectively connected to the two ends of the flared combined conduit, a steel ball is pressed against the rear of the recess and does not move, gas of a certain pressure is introduced into the outer end of the connecting tube, and then an ultrasonic leak detector is set behind the recess to perform leakage detection; if no leakage is detected, it indicates that the sealing between the connecting tube and the flared combined conduit is good.

[0012] The second aspect of the present application provides an aircraft flared combined duct dent repair tool, comprising a connecting tube, steel balls and a collecting tube; the connecting tube is a cylindrical part, the outer end of the connecting tube is threadedly connected to the output end of the hydraulic test bench, and the inner end is threadedly connected to one end of the flared combined duct; there are multiple steel balls and their diameters decrease in sequence, and the steel ball with the largest diameter has the same inner diameter as the connecting tube and the collecting tube; the inner end of the collecting tube is threadedly connected to the other end of the flared combined duct, and the outer end is provided with a through hole, and the through hole of the collecting tube is located in the oil tank.

[0013] The present invention addresses the difficult problem of repairing dents in flared combination ducts. This invention is applicable to dent repairs in flared combination ducts of various inner diameters and complex shapes, and can be performed by one person, resulting in simple operation. It saves time and effort, and the repaired flared combination duct meets operational requirements. This design can also be used to correct the roundness of flared combination ducts. Furthermore, by using steel balls, starting from small to large, to repair the dents, it effectively prevents excessive force from being applied to the dents. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.

[0015] Figure 1 It is a schematic diagram in the background technology; Figure 2 This is a schematic diagram of the connection structure of the connecting tube, the collecting tube and the flared combined conduit of this application; Figure 3 Schematic diagram of the dent repair of the flared combined catheter in this application.

[0016] In the figure, 1. connecting tube; 2. steel ball; 3. collecting tube; 4. flared combined conduit. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] Example 1: A method for repairing a dent in an aircraft flared combined conduit, combining Figure 2 , including the following steps: Step S100, measuring the deepest dimension L of the flared combined conduit 4; Step S200: Setting up a connecting tube 1 and a collecting tube 3. Placing a plurality of steel balls 2 side by side in the connecting tube 1. The diameter and number of the steel balls 2 are determined based on the inner diameter of the flared combined conduit 4 and the dimension L of the deepest part of the recess. The inner diameters of the connecting tube 1 and the collecting tube 3 are set to be the same as the inner diameter of the flared combined conduit 4. Preferably, the diameter and number of the steel balls 2 are determined as follows: a smooth repair threshold is set, the size L is divided by the smooth repair threshold and the number of steel balls 2 is rounded up; then the diameter of each steel ball 2 is determined in descending order according to the smooth repair threshold; all the steel balls 2 are placed in 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.

[0019] like Figure 3 By using multiple steel balls 2 with different diameters, the depression can be repaired in sections, thereby avoiding excessive repair volume, which causes excessive force on the depression and causes cracks, damage, etc.

[0020] The smooth repair threshold determines the smoothness of the dent repair. The more steel balls 2 there are, the less the steel balls pass through the dent repair each time. However, if there are too many steel balls, the position stability between the steel balls 2 will be poor. Therefore, setting an appropriate smooth repair threshold determines the smoothness of the dent repair.

[0021] In a specific example, the inner diameter of the flared combined catheter 4 is 16 mm, the deepest dimension of the measured depression is 1 mm, the smooth repair threshold is 0.3, and the calculation , the number of steel balls 2, N, is 3 + 1 = 4. The diameter of the largest steel ball 2 is 16 mm; the sizes of the subsequent steel balls 2 decrease by 0.3 mm, namely 15.7 mm, 15.4 mm, and 15.1 mm.

[0022] Step S300, connect the connecting tube 1 and the collecting tube 3 to the two ends of the flared combination conduit 4 respectively and communicate with each other internally; control the steel ball 2 at the outer end of the connecting tube 1 to be able to slide and seal with the connecting tube 1 and the flared combination conduit 4, that is, the steel ball 2 is always in a closed state between the part it drives during the rolling process, ensuring stability after the subsequent introduction of lubricating oil; the steel ball 2 can contact the spherical surface of the concave inner wall of the flared combination conduit 4; the outer end of the connecting tube 1 is the end away from the flared combination conduit 4.

[0023] In order to ensure the sealing, a sealing test is carried out after the installation is completed. Specifically, after the connecting tube 1 and the collecting tube 3 are respectively connected to the two ends of the flared combined conduit 4, the steel ball 2 is pressed against the rear part of the recess and does not move. A certain air pressure of gas is introduced into the outer end of the connecting tube 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 tube 1 and the flared combined conduit 4 is good.

[0024] In step S400, lubricating oil is introduced into the outer end of the connecting tube 1 to drive the steel balls 2 to roll in the connecting tube 1, the flared combined conduit 4 and the collecting tube 3. The lubricating oil is in a sealed state during the rolling. When the steel balls 2 roll to the depression, the hydraulic oil impacts the steel balls 2 to repair the depression from the inside out. When all the steel balls 2 have passed through the depression, the repair is completed.

[0025] Preferably, the left end of the connecting tube 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 combined conduit 4, and the collecting tube 3 is connected to the right end of the flared combined conduit 4. One end of the collecting tube 3 is placed in the oil tank to facilitate the collection of hydraulic oil.

[0026] Start the hydraulic test bench, increase the hydraulic pressure to 5MPa, turn on the switch, apply pressure to the steel ball 2 through the hydraulic oil, and impact the steel ball 2 from the left end to the right end of the flared combination conduit 4 in turn, so that the steel ball 2 reaches and passes through the concave inner wall of the flared combination conduit 4 in turn, and gradually completes the repair of the dent.

[0027] After the dent is repaired, turn off the switch and disassemble the flared combined conduit 4.

[0028] The above design solves the problem of repairing dents in flared combined conduits (4). It is applicable to dents of various inner diameters and complex shapes, and can be performed by one person, making it simple to operate. It saves time and effort, and the repaired flared combined conduit (4) meets the required performance. This design can also be used to improve the roundness of flared combined conduits (4). Furthermore, by using steel balls (2) to repair the dents in ascending order, the dents are effectively prevented from being subjected to excessive force.

[0029] Example 2, an aircraft flared combined conduit dent repair tool, comprising a connecting tube 1, steel balls 2 and a collecting tube 3; the connecting tube 1 is a cylindrical part, the outer end of the connecting tube 1 is threadedly connected to the output end of the hydraulic test bench, and the inner end is threadedly connected to one end of the flared combined conduit 4; there are multiple steel balls 2 and their diameters decrease in sequence, and the steel ball 2 with the largest diameter is the same as the inner diameter of the connecting tube 1 and the collecting tube 3; the inner end of the collecting tube 3 is threadedly connected 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 tube 3 is located in the oil tank.

[0030] The collecting tube 3 can tighten the steel balls 2 to prevent them from being ejected due to the hydraulic pressure and causing personal injury. When all the steel balls 2 enter the collecting tube 3 through the recess, the hydraulic oil can leak out from the through hole, preventing the hydraulic pressure from being too high and causing damage to the flared combined conduit 4.

[0031] The steel ball 2 is made of bearing steel with a hardness of HRC58-62 and a chrome-plated surface; the outer surface of the left end of the connecting tube 1 is an external hexagonal structure, which is convenient for tightening the connecting tube 1; the right side of the connecting tube 1 is a 74° external thread, which is connected to the internal thread of the outer sleeve nut on the left side of the flared combination conduit 4. There is a long hole inside the right side with a hole diameter of dN+0.1mm, where N is the number of steel balls 2.

[0032] Finally, it should be noted that the drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the present invention can be combined with each other. Finally: 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 in the scope of protection of the present invention.

Claims

1. A method for repairing a dent in an aircraft flared combined conduit, characterized in that: include: A connecting tube (1) and a collecting tube (3) are provided, and a plurality of steel balls (2) are placed in parallel in the connecting tube (1). The diameter and number of the steel balls (2) are determined according to the inner diameter of the flared combined conduit and the dimension L of the deepest part of the recess. The inner diameters of the connecting tube (1) and the collecting tube (3) are set to be the same as the inner diameter of the flared combined conduit (4). The connecting tube (1) and the collecting tube (3) are respectively connected to the two ends of the flared combined conduit (4) and are internally connected; the steel ball (2) at the outer end of the connecting tube (1) is controlled to be able to slide and seal with the connecting tube (1) and the flared combined conduit (4); the steel ball (2) is able to contact the spherical surface of the concave inner wall of the flared combined conduit (4); the outer end of the connecting tube (1) is the end away from the flared combined conduit (4); Lubricating oil is introduced into the outer end of the connecting cylinder (1) to drive the steel balls (2) to roll in the connecting cylinder (1), the flared combined conduit (4) and the collecting cylinder (3), and the lubricating oil is in a sealed state during the rolling; when the steel balls (2) roll to the concave part, the hydraulic oil impacts the steel balls (2) to repair the concave part from the inside out, and when all the steel balls (2) have passed through the concave part, the repair is completed.

2. The method for repairing a dent in an aircraft flared combined duct according to claim 1, wherein: The diameters of the different steel balls (2) gradually decrease from the outer end of the connecting tube (1) to the end connected to the flared combined conduit (4); the diameter of the largest steel ball (2) is the same as the inner diameter of the flared combined conduit (4).

3. The method for repairing a dent in an aircraft flared combined duct according to claim 2, wherein: A smoothing repair threshold is set, the size L is divided by the smoothing repair threshold and the number of steel balls (2) is obtained by rounding up; and then the diameter of each steel ball (2) is determined in descending order according to the smoothing repair threshold.

4. The method for repairing a dent in an aircraft flared combined duct according to claim 1, wherein: The specific method of repairing the depression from the inside out is as follows: connecting the connecting tube (1) to the output end of the hydraulic test bench and placing the collecting tube (3) in the oil tank; turning on the switch of the hydraulic test bench and controlling 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) sequentially reaches and passes through the inner wall of the depression of the flared combined conduit (4) until the depression is repaired; after the flared combined conduit (4) is repaired, turning off the switch and disassembling the flared combined conduit (4).

5. The method for repairing a dent in an aircraft flared combined duct according to claim 1, wherein: After the connecting tube (1) and the collecting tube (3) are respectively connected to the two ends of the flared combined conduit (4), the steel ball (2) is pressed against the rear of the depression and does not move, and gas at a certain pressure is introduced into the outer end of the connecting tube (1), and then an ultrasonic leak detector is set behind the depression to perform a gas leakage detection; if no leakage is detected, it indicates that the sealing between the connecting tube (1) and the flared combined conduit (4) is good.

6. An aircraft flared combined conduit dent repair tool, using the method according to any one of claims 1 to 5, characterized in that: The invention comprises a connecting tube (1), a steel ball (2) and a collecting tube (3); the connecting tube (1) is a cylindrical part, the outer end of the connecting tube (1) is threadedly connected to the output end of the hydraulic test bench, and the inner end is threadedly connected to one end of the flared combined conduit (4); there are multiple steel balls (2) with diameters decreasing in sequence, and the steel ball (2) with the largest diameter has the same inner diameter as the connecting tube (1) and the collecting tube (3); the inner end of the collecting tube (3) is threadedly connected 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 tube (3) is located in the oil tank.

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