Automated device for fluidic cleaning of an aircraft fuel system and method of use thereof

Abstract

The present application belongs to the technical field of aircraft fuel system, and relates to an automatic device for jet cleaning of an aircraft fuel system and a use method thereof. The present application adopts a form of a stepping motor matched with a rudder to realize rotation of a three-degree-of-freedom mechanism, achieve accurate positioning in space, adopt program setting of a fixed jet route, drive and control a three-degree-of-freedom steering mechanism to perform omnidirectional jet cleaning according to a specified route, can effectively remove excess materials in the fuel tank, simultaneously increase a fuel cooling system device, realize real-time monitoring of fuel temperature by a built-in temperature sensor, and automatically realize a fuel cooling function, provide suitable temperature fuel for the jet device, avoid the influence of high temperature on each system in the fuel tank, and realize automatic and intelligent cleaning. The automatic cleaning device has a simple operation process, complete cleaning effect, improved cleaning efficiency, reduced production cost, and improved economic benefit of the company.

Description

Technical Field

[0001] This invention belongs to the field of aircraft fuel system technology, and relates to an automated jet cleaning device for aircraft fuel systems and its usage method. Background Technology

[0002] The function of an aircraft fuel system is to store fuel and ensure a continuous supply of fuel to the engine at the required pressure and flow rate under all specified conditions (such as various flight altitudes and attitudes). The fuel system also performs additional functions such as cooling other systems on the aircraft (such as hydraulic, air conditioning, radar, and generator systems), balancing the aircraft, and maintaining its center of gravity within a specified range. The cleanliness of the aircraft fuel system directly affects the performance of the aircraft engine and the operational status of the various components within the fuel tank. Therefore, removing impurities such as metals and rubber generated during the manufacturing and assembly of components is a critical process to prevent fuel contamination that could lead to decreased engine performance or malfunction of other systems, thus avoiding flight safety accidents.

[0003] Currently, the fuel system of the central wing in the assembly workshop requires jet cleaning in the cleaning room. The jet cleaning process first involves hoisting the central wing fuel tank onto the jet cleaning test rotating frame. The cleaning port cover is then fixed to the fuselage wall panel using standard process components. The fuel hose of the test bench is connected to the jet device connector outside the cleaning port cover. Before jet cleaning, the operator manually rotates the rotating nozzle of the jet device inside the cleaning port cover to ensure that the rotating nozzle does not interfere with the conduits, system components, or structural components. If interference occurs, the jet device must be readjusted. If interference cannot be avoided by adjusting the jet device, the installation positions of the structural components, system components, and conduits inside the fuel tank need to be adjusted, resulting in a significant workload and operational difficulty. During jet cleaning, high-pressure fuel is output from the test bench, transmitted through the hose to the jet device, and finally sprayed out through the rotating nozzle of the jet device. Under the action of the high-pressure jet, the rotating nozzle rotates rapidly and irregularly, spraying high-pressure fuel into the fuel tank, achieving the effect of cleaning the fuel tank. According to the process specifications, jet cleaning requires multiple repeated cleaning cycles. The final result is determined by observing the number of particles on the fuel filter screen; if the number of particles is insufficient, the jet cleaning process is repeated. However, during cleaning, the rotating nozzles spray in a random and unpredictable direction, making it impossible to guarantee that every area in the fuel tank is thoroughly cleaned. Therefore, the current cleaning effect of this device is not ideal, resulting in incomplete cleaning and necessitating multiple repetitions, leading to low efficiency and high cost.

[0004] Furthermore, because the temperature of the fuel used for jet cleaning rises rapidly under high pressure and high speed, the design requires that the fuel temperature during jet cleaning not exceed 50°C. If the fuel temperature exceeds this level, it will damage the sealant, sensors, and other components within the fuel tank. Currently, during jet cleaning, the test must be stopped when the fuel temperature exceeds 50°C. The test bench is restarted only after the temperature has dropped sufficiently below 50°C, and the jet cleaning test is restarted from the beginning. This repeated starting and stopping of the test bench and the resulting pressure shocks damage the fuel system components, severely impacting the efficiency of the testing process. The operation is complex and cumbersome, creating unnecessary workload for operators, increasing labor costs, and affecting product delivery cycles. Summary of the Invention

[0005] The present invention provides an automated device for jet cleaning of aircraft fuel systems for field operators, in order to solve the problems of poor effect, low efficiency and high cost of jet cleaning devices for aircraft fuel systems, and improve the jet cleaning effect of fuel tanks.

[0006] The technical problem solved by this invention is achieved by the following technical solution:

[0007] The automated jet cleaning device for aircraft fuel systems employs a three-degree-of-freedom intelligent steering mechanism in conjunction with jet hose nozzles for spray cleaning. The first degree of freedom is driven by a stepper motor, enabling 360° rotation of the base. The second degree of freedom is driven by a servo motor, allowing the support arm to swing 0-180°. The third degree of freedom is also driven by a servo motor, allowing the support arm to swing 0-180°. Software programs simultaneously control the rotation angles of the three motors, achieving three-degree-of-freedom spatial positioning and directing the nozzles to perform jet cleaning in the specified direction. This cleaning method ensures thorough cleaning without any missed areas, effectively cleaning all parts of the fuel tank. Based on the structural distribution within the fuel tank, this system focuses on cleaning areas with narrow spaces and those far from the nozzles. Compared to previous irregular spraying, this system uses a programmed fixed spray path to drive and control a three-degree-of-freedom steering mechanism to perform all-around jet cleaning along a predetermined route. This effectively removes excess material from the fuel tank. Furthermore, an added fuel cooling system with a built-in temperature sensor monitors fuel temperature in real time and automatically cools the fuel, providing the jetting device with fuel at the appropriate temperature to prevent high temperatures from affecting other systems within the fuel tank. This automated cleaning device achieves intelligent cleaning, improves cleaning efficiency, and reduces cleaning costs.

[0008] The structure of the automated jet cleaning device for aircraft fuel systems is shown in the attached figure. Figure 1 Appendix Figure 2 and attached Figure 3As shown, the device comprises components such as a cleaning process port cover, a hose buffer device, M5 connecting bolts, a base bracket, a coupling, a stepper motor, M4 connecting bolts, M3 screws, an upper U-shaped support arm, a lower U-shaped support arm, a bracket, a clamping plate, a servo motor, fixing bolts, a rotary bearing, a fixing nut, a servo motor base, connecting studs, a rotating disk, a base disk, a servo disc, M8 connecting bolts, a fuel cooling device, a jet cleaning hose, an electrical control box, a fuel connection pipe, and a test bench. The cleaning process port cover, M5 connecting bolts, base bracket, coupling, M4 connecting bolts, M3 screws, upper U-shaped support arm, lower U-shaped support arm, bracket, fixing bolts, rotary bearing, fixing nut, servo motor base, connecting studs, rotating disk, base disk, servo disc, and M8 connecting bolts constitute the structural parts of the device; the hose buffer device, clamping plate, fuel cooling device, jet cleaning hose, fuel connection pipe, and test bench constitute the functional parts of the device; and the stepper motor, servo motor, and electrical control box constitute the electrical control parts of the device.

[0009] The cleaning process port cover is used to connect to the oil tank. The cover has eight bolt holes. During testing, the cleaning process port cover is fixed to the oil tank with bolts. The base bracket is connected to the cleaning port cover with four M5 connecting bolts to secure the entire jet device and ensure the stability of the entire mechanism. The stepper motor is fixed to the base bracket with four M3 screws. The stepper motor can rotate 360° through programming. Simultaneously, the stepper motor shaft is connected to the shaft on the rotating disk via a coupling. When the stepper motor rotates, it drives the rotating disk to rotate synchronously, achieving the first degree of freedom of rotation. The rotating disk and the base disk are connected with four connecting studs, also achieving synchronous rotation. The servo base is connected to the base disk with four M4 connecting bolts, and the servo is fixed to the servo base with four M3 screws. The servo's rotating shaft has a gear on its outer ring, which meshes with the gear on the inner ring of the servo disc. The servo's rotating shaft also has an M3 internal thread, and a single M3 screw locks the servo disc and servo together, enabling the servo to drive the servo disc to rotate synchronously. One end of the upper U-shaped support arm is fixed to the servo disc with four M3 screws, while the other end is connected to the servo base via a fixing bolt, a fixing nut, a rotary bearing, and the fixing bolt and nut. After tightening, the arm is integrated with the servo base and remains stationary. The fixing nut presses against the inner ring of the rotary bearing, allowing the upper U-shaped support arm to drive the outer ring of the rotary bearing to rotate synchronously. Therefore, when the servo rotates, the upper U-shaped support arm, relying on its two fulcrums, can rotate synchronously with the servo disc, achieving a second degree of freedom rotational motion. The lower U-shaped support arm is fixedly connected to the upper U-shaped support arm by four M4 connecting bolts. The connection method of the upper U-shaped support arm is the same. One end of the lower U-shaped support arm is fixedly connected to the servo disk by four M3 screws, and the other end is also connected to the servo base by fixing bolts, fixing nuts, rotary bearings and servo base. The servo is installed on the lower servo base by four M3 screws. When the second servo rotates, the rotational movement of the third degree of freedom is realized here.

[0010] The test bench primarily supplies high-pressure fuel to the jet cleaning device. This high-pressure fuel is delivered to the fuel cooling device via a fuel connection pipe. When the fuel temperature is too high, the fuel cooling device automatically activates its cooling system to cool the fuel in real time, transferring the cooled fuel to the jet cleaning hose. The jet cleaning hose has a diameter of 12mm. A hose buffer device is fixed to the cleaning process port cover with two M5 connecting bolts. The hose buffer device has a φ12.5 round hole through which the jet cleaning hose passes, acting as a buffer to prevent vibration caused by high pressure. Simultaneously, the end of the jet cleaning hose is clamped and fixed by two M3 screws via a clamping plate, ensuring that the nozzle at the end of the jet cleaning hose can perform jet cleaning in the specified direction with the three-degree-of-freedom steering mechanism.

[0011] The stepper motor is a two-phase high-torque stepper motor, capable of precise rotation from 0-360°. The servo motor is a 20kg metal gear servo motor, capable of rotation from 0-180°. The electrical control box is fixed to the upper part of the fuel cooling device with two M8 connecting bolts. The electrical control box contains a power switch, start button, reset button, control module, motor drive module, power supply module, etc., used to control the rotation of the stepper motor and the two servo motors. According to the structural characteristics of the fuel tank, a fixed cleaning route program is set, focusing on cleaning areas with narrow structures and far from the nozzle. The two servo motors are used to control the rotation of the second and third degrees of freedom, respectively, covering the 180° angle range between the upper and lower walls of the fuel tank. The stepper motor controls the first degree of freedom, realizing 360° rotation of the base. Through the cooperation of the stepper motor and the two servo motors, full-angle coverage cleaning of the fuel tank is achieved. The drive and control of the three-degree-of-freedom steering mechanism performs all-round jet cleaning according to the prescribed route, which can effectively remove excess matter in the fuel tank.

[0012] Step 1: Before cleaning, turn off the power switches of the test bench, fuel cooling device, and electrical control box. Check that one end of the fuel connection pipe is connected to the test bench and the other end is connected to the fuel cooling device. One end of the jet cleaning hose is connected to the fuel cooling device, and the other end is connected to the hose buffer device, with the end nozzle pressed and fixed by the clamping plate.

[0013] Step Two: Secure the cleaning process port cover to the fuel tank with bolts. This completes the installation work before the jet cleaning device is installed. To begin jet cleaning, first turn on the power switch of the test bench to supply high-pressure fuel. Adjust the pressure valve on the test bench to ensure the fuel pressure output from the test bench meets the requirements.

[0014] Step 3: Turn on the power switch of the fuel cooling device. The temperature sensor inside the system can monitor the fuel temperature. When the fuel temperature is too high, the cooling system can be automatically turned on to cool the fuel in real time, ensuring that the fuel temperature of the jet cleaning meets the requirements.

[0015] Step 4: Turn on the power switch of the electrical control box. At this time, the stepper motor and servo motor are powered on. Press the reset button of the electrical control box. The stepper motor and servo motor rotate to the initial position. At this time, the nozzle of the jet cleaning hose is pointed to the vertical direction of the upper wall panel through the second and third degrees of freedom. Press the start button to start driving the nozzle at the end of the jet cleaning hose to perform jet cleaning.

[0016] Step 5: According to the cleaning route, the second and third degrees of freedom form a combined mechanism through two servo motors, driving the jet cleaning hose nozzle to rotate from a direction perpendicular to the upper wall panel to a direction perpendicular to the lower wall panel, rotating a total of 180°. For every 0.1° rotation of the second and third degree of freedom combined mechanism, the first degree of freedom mechanism of the stepper motor drives the base disk to rotate 360° once, thus the entire cleaning route undergoes 1800 rotational cleaning cycles.

[0017] Step Six: In addition, when the first degree of freedom mechanism of the stepper motor drives the base disk to rotate 360°, according to the structural characteristics of the oil tank, the narrow structure and the distance from the nozzle are targeted for cleaning. Through program control, the rotation stops at a certain angle in the first degree of freedom to achieve extended cleaning time.

[0018] Step 7: After completing the entire cleaning route, press the reset button on the electrical control box. The three-degree-of-freedom steering mechanism will return to its initial position. Finally, turn off the power switches of the test bench, fuel cooling device, and electrical control box. The cleaning process is now complete.

[0019] The beneficial effects of this invention are:

[0020] This invention explores an intelligent cleaning method that uses a stepper motor combined with a servo motor to achieve a three-degree-of-freedom mechanism for precise spatial positioning. By programming a fixed spray path, the three-degree-of-freedom steering mechanism is driven and controlled to perform omnidirectional jet cleaning along the predetermined route, effectively removing excess material from the fuel tank. Simultaneously, a fuel cooling system is added, with a built-in temperature sensor monitoring the fuel temperature in real time and automatically cooling the fuel to provide the jet device with fuel at a suitable temperature, preventing high temperatures from affecting the systems within the fuel tank. This achieves automated and intelligent cleaning. The automated cleaning device has a simple operation process, thorough cleaning effect, improved cleaning efficiency, reduced production costs, and increased company economic benefits. Attached Figure Description

[0021] Figure 1 This is an isometric view of the jet mechanism of an automated jet cleaning device for aircraft fuel systems;

[0022] Figure 2 This is a left view of the jet mechanism of an automated jet cleaning device for aircraft fuel systems.

[0023] Figure 3 This is a schematic diagram of the overall structure of an automated jet cleaning device for aircraft fuel systems.

[0024] Among them, 1-cleaning process port cover, 2-hose buffer device, 3-M5 connecting bolt, 4-base bracket, 5-coupling, 6-stepper motor, 7-M4 connecting bolt, 8-M3 screw, 9-upper U-shaped support arm, 10-lower U-shaped support arm, 11-bracket, 12-clamping plate, 13-servo motor, 14-fixing bolt, 15-rotary bearing, 16-fixing nut, 17-servo motor base, 18-connecting stud, 19-rotating disc, 20-base disc, 21-servo disc, 22-M8 connecting bolt, 23-fuel cooling device, 24-jet cleaning hose, 25-electric control box, 26-fuel connection pipe, 27-test bench. Detailed Implementation

[0025] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. This embodiment is based on the technical solution of the invention and provides detailed implementation methods and specific implementation processes. However, the scope of protection of the present invention is not limited to the following implementation examples.

[0026] Example 1:

[0027] The structure of the automated jet cleaning device for aircraft fuel systems is shown in the attached figure. Figure 1 Appendix Figure 2 and attached Figure 3 As shown, it consists of components such as a cleaning process port cover 1, a hose buffer device 2, an M5 connecting bolt 3, a base bracket 4, a coupling 5, a stepper motor 6, an M4 connecting bolt 7, an M3 screw 8, an upper U-shaped support arm 9, a lower U-shaped support arm 10, a bracket 11, a clamping plate 12, a servo motor 13, a fixing bolt 14, a rotary bearing 15, a fixing nut 16, a servo motor base 17, a connecting stud 18, a rotating disk 19, a base disk 20, a servo disk 21, an M8 connecting bolt 22, a fuel cooling device 23, a jet cleaning hose 24, an electrical control box 25, a fuel connection pipe 26, and a test bench 27. The structural components of the device are: cleaning process port cover 1, M5 connecting bolt 3, base bracket 4, coupling 5, M4 connecting bolt 7, M3 screw 8, upper U-shaped support arm 9, lower U-shaped support arm 10, bracket 11, fixing bolt 14, rotary bearing 15, fixing nut 16, servo base 17, connecting stud 18, rotating disk 19, base disk 20, servo disk 21, and M8 connecting bolt 22. The functional components of the device are: hose buffer device 2, clamping plate 12, fuel cooling device 23, jet cleaning hose 24, fuel connection pipe 26, and test bench 27. The electrical control components of the device are: stepper motor 6, servo motor 13, and electrical control box 25.

[0028] The cleaning process port cover 1 is used to connect to the oil tank. The cover has eight bolt holes. During testing, the cleaning process port cover 1 is fixed to the oil tank with bolts. The base bracket 4 is connected to the cleaning port cover 1 with four M5 connecting bolts 3 to fix the entire jet device and ensure the stability of the entire mechanism. The stepper motor 6 is fixed to the base bracket 4 with four M3 screws 8. The stepper motor 6 can achieve 360° rotation through program settings. Simultaneously, the shaft of the stepper motor 6 is connected to the shaft on the rotating disk 19 via a coupling 5. When the stepper motor 6 rotates, it drives the rotating disk 19 to rotate synchronously, achieving the first degree of freedom of rotation. The rotating disk 19 and the base disk 20 are connected with four connecting studs 18, also achieving synchronous rotation. The servo base 17 is connected to the base disk 20 with four M4 connecting bolts 7, and the servo motor 13 is fixed to the servo base 17 with four M3 screws 8. The outer ring of the rotating shaft of servo motor 13 has a gear that meshes with the inner ring gear of servo disk 21. Simultaneously, the rotating shaft of servo motor 13 has an M3 internal thread, and servo disk 21 and servo motor 13 are locked together by an M3 screw 8, enabling servo motor 13 to drive servo disk 21 to rotate synchronously. One end of the upper U-shaped support arm 9 is connected and fixed to servo disk 21 by four M3 screws 8, and the other end is connected to servo motor base 17 by fixing bolts 14, fixing nuts 16, a rotary bearing 15, and fixing bolts 14 and nut 16. After the fixing bolts 14 and nut 16 are tightened, they are integrated with servo motor base 17 and remain stationary. At this time, the fixing nut 16 presses against the inner ring of the rotary bearing 15, allowing the upper U-shaped support arm 9 to drive the outer ring of the rotary bearing 15 to rotate synchronously. Therefore, when servo motor 13 rotates, the upper U-shaped support arm 9, relying on its two end supports, can rotate synchronously with servo disk 21, thus achieving a second degree of freedom rotational movement. The lower U-shaped support arm 10 is fixedly connected to the upper U-shaped support arm 9 by four M4 connecting bolts 7. The connection method of the upper U-shaped support arm 9 is the same. One end of the lower U-shaped support arm 10 is fixedly connected to the servo disk 21 by four M3 screws 8, and the other end is also connected to the servo base 17 by fixing bolts 14, fixing nuts 16, rotary bearings 15, and servo base 17. The servo 13 is installed on the lower servo base 17 by four M3 screws 8. When the second servo 13 rotates, the rotational movement of the third degree of freedom is realized here.

[0029] The test bench 27 primarily supplies high-pressure fuel to the jet cleaning device. The high-pressure fuel is delivered to the fuel cooling device 23 via the fuel connection pipe 26. When the fuel temperature is too high, the fuel cooling device 23 automatically activates the cooling system to cool the fuel in real time, transferring the cooled fuel to the jet cleaning hose 24, which has a diameter of 12mm. The hose buffer device 2 is fixed to the cleaning process port cover 1 by two M5 connecting bolts 3. The hose buffer device 2 has a φ12.5 round hole through which the jet cleaning hose 24 passes, acting as a buffer to prevent vibration caused by high pressure. Simultaneously, the end of the jet cleaning hose 24 is clamped and fixed by two M3 screws 8 via a clamping plate 12, ensuring that the nozzle at the end of the jet cleaning hose 24 can perform jet cleaning in the specified direction with the three-degree-of-freedom steering mechanism.

[0030] Stepper motor 6 is a two-phase high-torque stepper motor capable of precise rotation from 0 to 360°. Servo motor 13 is a 20kg metal gear servo motor capable of rotation from 0 to 180°. The electrical control box 25 is fixed to the upper part of the fuel cooling device 23 by two M8 connecting bolts 22. The electrical control box 25 contains a power switch, start button, reset button, control module, motor drive module, power supply module, etc., used to control the rotation of stepper motor 6 and the two servo motors 13. Based on the structural characteristics of the oil tank, a fixed cleaning route program is set, and key areas that are narrow and far from the nozzle are sprayed. Two servo motors 13 are used to control the rotation of the second and third degrees of freedom, respectively, and are responsible for the 180° angle range between the upper and lower walls of the oil tank. Stepper motor 6 is used to control the first degree of freedom, realizing the 360° rotation of the base. Through the cooperation of stepper motor 6 and two servo motors 13, full-angle coverage cleaning of the oil tank is achieved. The drive control three-degree-of-freedom steering mechanism performs all-round jet cleaning according to the prescribed route, which can effectively remove excess matter in the oil tank.

[0031] Example 2:

[0032] The operating procedure for the automated jet cleaning device for aircraft fuel systems is as follows:

[0033] Step 1: Before cleaning, turn off the power switches of the test bench 27, fuel cooling device 23 and electrical control box 25. Check that one end of the fuel connection pipe 26 is connected to the test bench 27 and the other end is connected to the fuel cooling device 23. One end of the jet cleaning hose 24 is connected to the fuel cooling device 23 and the other end is connected to the hose buffer device 2. The end nozzle is pressed and fixed by the clamping plate 12.

[0034] Step 2: Secure the cleaning process port cover 1 to the fuel tank with bolts. This completes the installation work before the jet cleaning device is installed. To begin jet cleaning, first turn on the power switch of the test bench 27 to supply high-pressure fuel to the system. Adjust the pressure valve on the test bench 27 to ensure that the fuel pressure output from the test bench meets the requirements.

[0035] Step 3: Turn on the power switch of the fuel cooling device 23. The temperature sensor inside the system can monitor the fuel temperature. When the fuel temperature is too high, the cooling system can be automatically turned on to cool the fuel in real time, ensuring that the fuel temperature of the jet cleaning meets the requirements.

[0036] Step 4: Turn on the power switch of the electrical control box 25. At this time, the stepper motor 6 and the servo motor 13 are powered on. Press the reset button of the electrical control box. The stepper motor 6 and the servo motor 13 rotate to the initial position. At this time, the nozzle of the jet cleaning hose 24 is pointed to the direction perpendicular to the upper wall panel through the second and third degrees of freedom. Press the start button to start driving the end nozzle of the jet cleaning hose 24 to perform jet cleaning.

[0037] Step 5: According to the cleaning route, the second and third degrees of freedom form a combined mechanism through two servo motors 13, driving the nozzle of the jet cleaning hose 24 to rotate from a direction perpendicular to the upper wall panel to a direction perpendicular to the lower wall panel, rotating a total of 180°. For every 0.1° rotation of the combined mechanism of the second and third degrees of freedom, the first degree of freedom mechanism of the stepper motor 6 drives the base disk to rotate 360° once, thus the entire cleaning route performs 1800 rotation cleaning cycles.

[0038] Step Six: In addition, when the first degree of freedom mechanism of the stepper motor 6 drives the base disk to rotate 360°, according to the structural characteristics of the oil tank, the position with a narrow structure and far from the nozzle is sprayed with key cleaning. Through program control, the rotation stops at a certain angle in the first degree of freedom to achieve extended cleaning time.

[0039] Step 7: After completing the entire cleaning route, press the reset button on the electrical control box 25. The three-degree-of-freedom steering mechanism will return to its initial position. Finally, turn off the power switches of the test bench 27, fuel cooling device 23, and electrical control box 25. The cleaning process is now complete.

Claims

1. An automated jet cleaning device for aircraft fuel systems, characterized in that, It includes structural components, functional components, and electronic control components; The structural components include a cleaning process port cover (1), a base bracket (4), a coupling (5), an upper U-shaped support arm (9), a lower U-shaped support arm (10), a bracket (11), a rotary bearing (15), a servo base (17), a rotating disk (19), a base disk (20), and a servo disk (21). The functional components include a hose buffer device (2), a clamping plate (12), a fuel cooling device (23), a jet cleaning hose (24), a fuel connection pipe (26), and a test bench (27). The electronic control unit includes a stepper motor (6), a servo motor (13), and an electronic control box (25); The cleaning process port cover (1) is used to connect to the oil tank. Eight bolt holes are provided on the port cover. During testing, the cleaning process port cover (1) is fixed to the oil tank with bolts. The base bracket (4) is connected to the cleaning process port cover (1), and the stepper motor (6) is fixed to the base bracket (4). The stepper motor (6) can achieve 360° rotation through program settings. Simultaneously, the shaft of the stepper motor (6) is connected to the shaft on the rotating disk (19) through a coupling (5). When the stepper motor (6) rotates... It can drive the rotating disk (19) to achieve synchronous rotation, thus realizing the first degree of freedom of rotation; the rotating disk (19) and the base disk (20) are connected, also achieving synchronous rotation; the servo base (17) and the base disk (20) are connected, and the servo (13) is fixed on the servo base (17); the outer ring of the rotating shaft of the servo (13) has a gear, which meshes with the inner ring gear of the servo disk (21), and the rotating shaft of the servo (13) has an M3 internal thread, which is connected by an M3 screw ( 8) Locking the servo disc (21) and servo motor (13) together enables the servo motor (13) to drive the servo disc (21) to rotate synchronously; one end of the upper U-shaped support arm (9) is connected and fixed to the servo disc (21), and the other end is connected to the servo motor base (17) through the rotary bearing (15). The upper U-shaped support arm (9) can drive the outer ring of the rotary bearing (15) to rotate synchronously. Therefore, when the servo motor (13) rotates, the upper U-shaped support arm (9) can rotate synchronously with the servo disc (21) by relying on the two end fulcrums. Rotate, at this time the second degree of freedom of rotation is realized; the lower U-shaped support arm (10) and the upper U-shaped support arm (9) are fixedly connected, and the connection method is the same as that of the upper U-shaped support arm (9). One end of the lower U-shaped support arm (10) is fixedly connected to the rudder disk (21), and the other end is connected to the servo base (17) through the rotary bearing (15). The servo (13) is installed on the lower servo base (17). When the second servo (13) rotates, the third degree of freedom of rotation is realized here; The test bench (27) provides high-pressure fuel to the jet device. The high-pressure fuel is transported to the fuel cooling device (23) through the fuel connection pipe (26). When the fuel temperature is too high, the fuel cooling device (23) can automatically turn on the cooling system to cool the fuel in real time and transfer the cooled fuel to the jet cleaning hose (24). The hose buffer device (2) is fixed on the cleaning process port cover (1). The hose buffer device (2) has a round hole. The jet cleaning hose (24) passes through the round hole of the hose buffer device (2). The electrical control box (25) is fixed to the upper part of the fuel cooling device (23) by two M8 connecting bolts (22).

2. The automated jet cleaning device for aircraft fuel systems as described in claim 1, characterized in that, The diameter of the jet cleaning hose (24) is 12mm.

3. The automated jet cleaning device for aircraft fuel systems as described in claim 1 or 2, characterized in that, The stepper motor (6) mentioned above is a two-phase high-torque stepper motor, which can achieve precise rotation from 0 to 360°.

4. The automated jet cleaning device for aircraft fuel systems as described in claim 1 or 2, characterized in that, The servo motor (13) is a 20kg metal gear servo motor, which can achieve 0-180° rotation.

5. The automated jet cleaning device for aircraft fuel systems as described in claim 3, characterized in that, The servo motor (13) is a 20kg metal gear servo motor, which can achieve 0-180° rotation.

6. The method of using the automated jet cleaning device for aircraft fuel systems as described in any one of claims 1 to 5, characterized in that, The steps are as follows: Step 1: Before cleaning, turn off the power switches of the test bench (27), fuel cooling device (23), and electrical control box (25). Check that one end of the fuel connection pipe (26) is connected to the test bench (27) and the other end is connected to the fuel cooling device (23). One end of the jet cleaning hose (24) is connected to the fuel cooling device (23), and the other end is connected to the hose buffer device (2). The end nozzle is pressed and fixed by the clamping plate (12). Step 2: Fix the cleaning process port cover (1) to the oil tank with bolts. At this time, the installation work before the jet cleaning is completed. When the jet cleaning begins, first turn on the power switch of the test bench (27) so that the system can supply high-pressure fuel. By adjusting the pressure valve of the test bench (27), ensure that the fuel pressure output from the test bench meets the requirements. Step 3: Turn on the power switch of the fuel cooling device (23). The temperature sensor inside the fuel cooling device (23) can monitor the fuel temperature. When the fuel temperature is too high, the cooling system can be automatically turned on to cool the fuel in real time, ensuring that the fuel temperature of the jet cleaning meets the requirements. Step 4: Turn on the power switch of the electrical control box (25). At this time, the stepper motor (6) and servo motor (13) are powered on. Press the reset button of the electrical control box. The stepper motor (6) and servo motor (13) rotate to the initial position. At this time, the nozzle of the jet cleaning hose (24) is pointed to the direction perpendicular to the upper wall plate through the second and third degrees of freedom. Press the start button to start driving the end nozzle of the jet cleaning hose (24) to perform jet cleaning. Step 5: According to the cleaning route, the second and third degrees of freedom form a combined mechanism through two servo motors (13), which drives the nozzle of the jet cleaning hose (24) to rotate from the direction perpendicular to the upper wall to the direction perpendicular to the lower wall, rotating a total of 180° in the process; for every 0.1° rotation of the combined mechanism of the second and third degrees of freedom, the first degree of freedom mechanism of the stepper motor (6) drives the base disk to rotate 360° once, so the entire cleaning route is rotated 1800 times for cleaning. Step 6: In addition, when the first degree of freedom mechanism of the stepper motor (6) drives the base disk to rotate 360°, according to the structural characteristics inside the oil tank, the position with a narrow structure and far from the nozzle is sprayed and cleaned in a focused manner. Through program control, the rotation stops at a certain angle in the first degree of freedom to achieve extended cleaning time. Step 7: After completing the entire cleaning route, press the reset button on the electrical control box (25), the three-degree-of-freedom steering mechanism returns to the initial position, and finally turn off the power switches of the test bench (27), fuel cooling device (23), and electrical control box (25) to end the cleaning process.

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