Intelligent inspection method for redundancy of aircraft fuel system pipeline

Abstract

The invention provides an intelligent inspection method for redundancy of an aircraft fuel system pipeline, and belongs to the technical field of aircraft assembly detection. The intelligent inspection method for the redundancy of the aircraft fuel system pipeline is realized based on a designed automatic detection workbench, a spherical detector is emitted into the aircraft fuel system pipeline through the automatic detection workbench, and a miniature high-precision positioning module is arranged in the detector and is used for judging whether the redundancy exists in the aircraft fuel system pipeline or not; and the redundant materials can be accurately positioned in the pipeline. Opening and closing control is carried out through the workbench electric gate valve, the detection process efficiency is improved, the labor intensity of operators is relieved, and meanwhile instability of manual operation is avoided; the detection accuracy is high, and the internal working state of the workbench can be accurately judged through real-time communication between the sensor and the control system; according to the invention, the judgment and detection of redundant substances can be comprehensively realized, and the detection error is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of aircraft assembly detection, and relates to a method for inspecting excess matter in an aircraft fuel system pipeline. By designing an intelligent special excess matter detection device, efficient and accurate screening of excess matter in a conduit is achieved. Background Art

[0002] The aircraft fuel system pipeline is used to achieve reliable transmission of fluid media on the aircraft. The fuel system uses fuel as the medium. The function of the fuel system is to store, supply and manage fuel to ensure that under any specified conditions (such as various flight altitudes and flight attitudes), the engine can be continuously and uninterruptedly supplied with fuel at the pressure and flow required by the engine to provide the aircraft with the required power. The fuel system is crucial to the safety performance of the aircraft, especially the cleaning of excess materials in the system pipeline is a prerequisite for ensuring the normal operation of the system function. If there is excess material in the system pipeline, it will pose a serious threat to flight safety and may lead to catastrophic consequences.

[0003] During the product production process, excess material in the fuel system conduit may be introduced from the outside or generated from the inside, including rubber particles, standard parts, aluminum bars, etc. At present, the main methods for checking excess material are shaking method or blowing method, and the excess material inspection is required before and after the conduit is installed and connected. The shaking method is that the operator shakes the conduit and judges whether there is excess material by vibration and sound. The blowing method is to connect the conduit to a high-pressure air source, blow air into the pipe at one end of the conduit, and observe whether there is excess material blown out at the other end of the conduit. The above two methods have limited ability to detect excess material. For example, if foreign objects such as standard parts and aluminum bars are stuck in the conduit, the above two methods cannot detect whether there is excess material, and the shaking method and blowing method are prone to scratches inside the pipe.

[0004] Therefore, in order to overcome the shortcomings of the above detection methods and improve the detection methods, an intelligent detection method for system catheter excess is invented, which can accurately determine whether there is excess in the pipeline and determine the specific location of the excess. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a method for accurately detecting excess matter in the pipeline of an aircraft fuel system. The method designs an automated detection workbench, through which a spherical detector is launched into the pipeline. A micro high-precision positioning module is arranged inside the detector, which can determine whether there is excess matter in the conduit and accurately locate the excess matter in the conduit. At the same time, according to different types of conduits, the workbench designs a multi-channel detection mode, which can realize the simultaneous detection of multiple system pipelines, thereby improving the detection efficiency and accuracy of the fuel conduit.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] An intelligent inspection method for excess material in aircraft fuel system pipelines comprises the following steps:

[0008] Step 1: Catheter excess detection and control

[0009] Step 1.1, electronic control system design

[0010] The electronic control system of the testing workbench consists of a hardware system and a host computer software. The hardware system includes a PLC control module, a sensor, an electrical valve, and a display screen, etc. The host computer software uses the LabVIEW graphical programming language for writing the host computer software, and can also perform data acquisition, testing, and control.

[0011] Step 1.2, Data Collection, Analysis and Design

[0012] According to the different models of fuel pipes, on-site data collection is carried out, and the diameter, length, bending radius and other data of the pipes to be tested are collected and input into the software program. At the same time, according to the size characteristics of the pipeline, a matching detector is designed. For example, the inner diameter of the pipe is (35-40) mm, and the outer diameter of the spherical detector is designed to be 35 mm to ensure that the detector can move in the pipeline. A high-precision positioning sensor is installed inside the detector. By calculating the speed and acceleration of the detector when it moves, the position of the detector in the pipeline can be located. At the same time, the outer surface of the detector is wrapped with soft plastic material to avoid scratching the inner wall of the pipeline.

[0013] Since there are many fuel pipes to be inspected and the pipes are of different sizes, spherical detectors of various sizes are required for simultaneous inspection. The present invention designs a five-channel detection mode, which can launch five detectors at the same time. Spherical detectors of different sizes are marked with different colors. For example, the detector with an outer diameter of 35mm is marked as black, the detector with an outer diameter of 40mm is marked as dark gray, the detector with an outer diameter of 45mm is marked as gray, the detector with an outer diameter of 50mm is marked as grayish white, and the detector with an outer diameter of 55mm is marked as white. The grayscale sensor in the workbench can identify the color depth, determine the detector model, and match the detector to the corresponding model pipe.

[0014] Step 1.3, bench detector launch method

[0015] The intelligent workbench is equipped with a detector classification device. Since the five-channel detection mode is set, the matching detectors are placed into the workbench channel openings in sequence according to the diameter of the pipeline to be detected. For example, the inner diameters of the pipelines to be tested are 38mm, 42mm, 47mm, 52mm, and 58mm, respectively, and the corresponding outer diameters of the detectors are 35mm, 40mm, 45mm, 50mm, and 55mm, respectively. The pipelines to be tested are connected to channel 1, channel 2, channel 3, channel 4, and channel 5 of the test pipeline in sequence. 1) Place a black 35mm outer diameter spherical detector into the inlet pipe. At this time, the inlet electric gate valve is in the closed state to support the detector; 2) The color of the detector is identified by the grayscale sensor, and the color information is transmitted to the PLC control system. The control system immediately initiates a drive command based on the color of the detector, controls the vacuum pump to start, and the inlet gate valve of channel one is opened, and the detector is sucked into the diversion chamber; 3) At the same time, the vacuum gate valve of channel one is opened, and the detector is sucked into the storage chamber of channel one and stays on the upper part of the ventilation screen; 4) According to the above steps, the other four detectors are placed in the inlet pipe in turn, and finally the detector is in the storage chamber of each channel; 5) Close the vacuum pump and vacuum gate valve of each channel, open the air gate valve and the air pump, and the detector of each channel is blown out of the storage chamber and enters the catheter to be tested through the outlet pipe. An air filter and an air pressure sensor are provided in the outlet pipeline. The air filter is used to filter impurities in the air to prevent them from entering the catheter and causing damage to the pipe wall. The air pressure sensor can monitor the air pressure status in real time to ensure the normal operation of the test. Figure 1 shown.

[0016] Step 1.4, redundant object detection method

[0017] The detectors of each channel are blown into pipelines of different models, entering from the starting end of the pipeline. If the detector is blown out from the ending end of the pipeline, it proves that there is no excess material in the pipeline. If the detector is not blown out from the end of the pipeline, the detector is blocked in the pipe, proving that there is excess material in the pipeline. For example, if the detector of channel 2 is retained in the pipeline, the software program can automatically match the model of the detected duct and the detector model. Through the high-precision positioning module inside the detector, since the size of the air outlet pipe inside the workbench and the diameter and length of the measured duct are all known data and have been entered into the software program, the speed and acceleration of the detector when it moves can be measured through the positioning sensor inside the detector. Physical data such as the detector's movement trajectory and the detector's retention position in the pipeline can be calculated, and finally the movement trajectory and position information are simulated on the display screen, which is convenient for operators to view and troubleshoot.

[0018] Step 2: Design an intelligent test bench

[0019] According to the inspection requirements for excess fuel pipes, a fully automatic workbench is designed. Through the intelligent control detection system, it can realize the rapid detection of excess fuel in pipes of various types. At the same time, through the high-precision positioning module and host computer software control, accurate screening of excess fuel in pipes can be achieved.

[0020] As attached Figure 2 , Attachment Figure 3 As shown, the device mainly includes M6 bolts 1, a control box 2, an air extraction pipeline 3, an air blowing pump 4, an air blowing gate valve 5, a diversion chamber 6, a machine body 7, a liquid crystal display screen 8, an inlet pipe 9, a power switch 10, a reset button 11, an air extraction gate valve 12, a filter 13, an air pressure sensor 14, an air extraction pump 15, a ventilation screen 16, a storage chamber 17, an air blowing pipeline 18, an inlet gate valve 19, a detector 20, a grayscale sensor 21, a bracket 22, M3 bolts 23, screws 24, and an air outlet pipeline 25. Among them, M6 bolts 1, exhaust pipeline 3, diversion chamber 6, body 7, inlet pipe 9, filter 13, ventilation screen 16, storage chamber 17, blowing pipeline 18, bracket 22, M3 bolts 23, screws 24, and outlet pipeline 25 constitute the structural part of the device, and the control box 2, blowing pump 4, blowing gate valve 5, LCD display 8, power switch 10, reset button 11, exhaust gate valve 12, air pressure sensor 14, exhaust pump 15, inlet gate valve 19, detector 20, and grayscale sensor 21 constitute the electronic control part of the device.

[0021] The inlet pipe 9 is arranged on the upper surface of the body 7, and is used for the input of the detector 20. The diversion chamber 6 is connected to the inlet pipe 9, and is used to divert detectors 20 of different specifications to the designated channel. The vacuum pump 15 is fixed to the bottom plate of the body 7 by two M6 bolts 1, and the vacuum pipeline 3 is led out from the vacuum pump 15, with a total of five vacuum pipelines. The storage chamber 17 is used to temporarily store the detector 20, and a ventilation screen 16 is arranged at the lower part. The detector 20 can be fixed to the upper part of the ventilation screen 16 by the suction force of the vacuum pump 15. The air pump 4 is fixed to the side wall of the body 7 by two M6 bolts 1, and one end of the air pipeline 18 is connected to the air pump 4, and the other end is connected to the storage chamber 17. One end of the air outlet pipeline 25 is connected to the storage chamber 17, and the other end is connected to the catheter to be tested (such as Figure 5 ), the outlet pipe 25 also has five channels (such as Figure 4 The bracket 22 is fixed to the machine body 7 by two M3 bolts 23 , and the grayscale sensor 21 is fixed to the bracket 22 by four screws 24 .

[0022] The control box 2 is fixed to the bottom plate of the machine body 7 by two M6 bolts 1. The control box 2 has a PLC control unit and a power module inside, which are used to collect the signals of each sensor and control each electrical module to execute the corresponding action instructions. The detector 20 is a spherical device, and a high-precision inertial navigation positioning sensor is installed inside. After the grayscale sensor 21 recognizes the color of the surface of the detector 20, the detection information is transmitted to the control box 2. The inlet gate valve 19 is used to support the detector 20. After the grayscale sensor 21 recognizes the color, the inlet gate valve 19 is opened, and the detector 20 enters the diversion chamber 6. The exhaust gate valve 12 is used to control the direction of the detector inside the diversion chamber 6. For example, when the exhaust gate valve 12 of channel one is opened, the detector 20 will be sucked into the storage chamber 17 of channel one. When preparing for the test, the air blowing gate valve 5 can release the high-pressure gas of the air blowing pump 4, and use the high-pressure gas to launch the detector 20. The filter 13 is used to filter impurities in the air to prevent impurities from entering the conduit and causing damage to the pipe wall. The air pressure sensor 14 is used to detect the gas pressure in the pipeline to ensure the air pressure stability of the test. The LCD screen 8 is used to display various detection data values, including sensor data collection, electrical valve switch status and excess position information. The power switch 10 is the main power switch of the workbench, and the reset button 11 can realize the reset of the electrical valves and sensors.

[0023] At present, the effect of the detection method of excess fuel pipe is not ideal, it cannot solve the problem of excess stuck in the pipe, it is easy to miss the detection, and there is a measurement error in manual detection of excess, so a method for detecting excess fuel pipe in aircraft is invented and an intelligent detection workbench is designed. The present invention has the following beneficial effects:

[0024] 1) The switch control is carried out through the workbench electrical gate valve, which improves the efficiency of the detection process, reduces the labor intensity of the operator, and avoids the instability of human operation.

[0025] 2) The intelligent workbench uses a variety of intelligent sensors for data collection with high detection accuracy. Through real-time communication between sensors and control systems, it can accurately judge the internal working status of the workbench.

[0026] 3) The use of a spherical detector can accurately determine whether there are any excess objects in the pipeline, and the high-precision positioning module can calculate the detector's movement trajectory and the detector's specific position information in the pipeline. This method can fully realize the judgment and detection of excess objects and avoid detection errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the internal functions of the workbench;

[0028] Figure 2 This is a schematic diagram of the internal axial side of the intelligent workbench;

[0029] Figure 3This is a schematic diagram of the left side of the interior of the smart workbench;

[0030] Figure 4 It is the overall axial side diagram of the workbench;

[0031] Figure 5 This is a schematic diagram of the entire left side of the workbench.

[0032] In the figure, 1-M6 bolt, 2-control box, 3-exhaust pipeline, 4-air pump, 5-air blowing gate valve, 6-diversion chamber, 7-machine body, 8-LCD display, 9-inlet pipe, 10-power switch, 11-reset button, 12-exhaust gate valve, 13-filter, 14-air pressure sensor, 15-exhaust pump, 16-ventilation screen, 17-storage chamber, 18-air blowing pipeline, 19-inlet gate valve, 20-detector, 21-grayscale sensor, 22-bracket, 23-M3 bolt, 24-screw, 25-exhaust pipeline. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with specific implementation cases.

[0034] Step 1: According to the test requirements, make preparations before testing, connect the five types of catheters to the outlet pipes 25 of the five channels of the workbench in sequence, and prepare detectors 20 that match the sizes of the catheters of each type;

[0035] Step 2: Turn on the power switch 10 and power on the control system. According to the inner diameter of the conduit to be tested, prepare to put the five detectors 20 of black, dark gray, gray, grayish white and white into the inlet pipe 9 in sequence. For example, first put the black detector 20 into the inlet pipe 9, the grayscale sensor 21 identifies its color and transmits the information to the control system, controls the inlet gate valve 19 to open, and the detector 20 enters the diversion chamber 6. Through the color detection information, the system automatically matches the black detector 20 to channel 1;

[0036] Step 3: Turn on the vacuum pump 15, open the vacuum gate valve 12 of channel 1, and the detector 20 enters the storage cavity 17 of channel 1 through suction and is fixed on the ventilation screen 16;

[0037] Step 4: According to the above steps, the detectors 20 of the other four colors are sequentially placed into the inlet pipe 9. Similar to steps 2 and 3, the other four detectors 20 will be automatically matched to the storage chambers 17 of the corresponding channels;

[0038] Step 5: Turn off the vacuum pump 15 and the vacuum gate valve 12, and turn on the air blowing pump 4 and the air blowing gate valve 5. The detectors 20 of the five channels will be blown into the five pipelines to start the detection of excess matter in the pipelines;

[0039] Step 6: Observe whether there is a detector 20 blown out at the end of each channel duct. If a detector is blown out, it proves that there is no excess material inside the duct of this model. If no detector 20 is blown out at the end of a duct, it proves that the detector 20 is blocked by excess material in the pipeline.

[0040] Step 7: If there is excess material in a certain type of catheter in step 6, it is necessary to further determine the position of the excess material in the pipeline. The moving track of the detector 20 and the specific position in the catheter can be observed through the LCD screen 8. The position of the detector 20 is the position of the excess material in the pipe. After determining the position of the excess material, the catheter is removed and the excess material is removed.

[0041] Step 8: After the detection of excess objects is completed, the detector 20 is recovered, the states of each electrical valve and sensor are returned to the initial state through the reset button 11, and the workbench power switch 10 is turned off, and the detection is completed.

[0042] The above-described embodiments merely express the implementation methods of the present invention, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An intelligent inspection method for excess material in aircraft fuel system pipelines, characterized in that: The intelligent inspection method for excess matter in the aircraft fuel system pipeline is implemented based on a designed automated detection workbench. A spherical detector is launched into the aircraft fuel system pipeline through the automated detection workbench. A micro high-precision positioning module is arranged inside the detector to determine whether there is excess matter in the aircraft fuel system pipeline and to accurately locate the excess matter in the pipeline.

2. The method for intelligently inspecting excess material in aircraft fuel system pipelines according to claim 1, characterized in that: The automated inspection workbench can realize rapid inspection of excess catheters of various types, and can also realize accurate screening of excess catheters through high-precision positioning modules and host computer software control; The automated testing workbench comprises a structural part and an electrical control part. The structural part comprises an air extraction pipeline (3), a diversion chamber (6), a machine body (7), an inlet pipe (9), a filter (13), a ventilation screen (16), a storage chamber (17), an air blowing pipeline (18), a bracket (22), and an air outlet pipeline (25); the electrical control part comprises a control box (2), an air blowing pump (4), an air blowing gate valve (5), a liquid crystal display (8), a power switch (10), a reset button (11), an air extraction gate valve (12), an air pressure sensor (14), an air extraction pump (15), an inlet gate valve (19), a detector (20), and a grayscale sensor (21).

3. The method for intelligently inspecting excess material in aircraft fuel system pipelines according to claim 2, characterized in that: The automated testing workbench is specifically: The inlet pipe (9) is arranged on the upper surface of the body (7) and is used for inputting the detector (20); the diversion chamber (6) is connected to the inlet pipe (9) and is used for diverting detectors (20) of different specifications to designated channels; the suction pump (15) is fixed on the bottom plate of the body (7), and the suction pipeline (3) is led out from the suction pump (15), with a total of five suction pipelines; the storage chamber (17) is used for temporarily storing the detector (20), and a ventilation screen (16) is arranged at the bottom, and the detector (20) can be fixed in the ventilation chamber by the suction force of the suction pump (15). The air pump (4) is fixed on the side wall of the machine body (7); one end of the air pipe (18) is connected to the air pump (4) and the other end is connected to the storage chamber (17); one end of the air outlet pipe (25) is connected to the storage chamber (17) and the other end is connected to the test conduit; the air outlet pipe (25) also has five channels in total; the bracket (22) is fixed on the machine body (7), and the grayscale sensor (21) is fixed on the bracket (22); when preparing for the test, the air gate valve (5) releases the high-pressure gas of the air pump (4), and the high-pressure gas is used to emit the detector (20); The control box (2) is fixed on the bottom plate of the machine body (7), and a PLC control unit and a power supply module are arranged inside the control box (2), which are used to collect signals from various sensors and control various electrical modules to execute corresponding action instructions; after the grayscale sensor (21) identifies the color of the surface of the detector (20), the detection information is transmitted to the control box (2); the inlet gate valve (19) is used to support the detector (20), and after the grayscale sensor (21) identifies the color, the inlet gate valve (19) is opened, and the detector (20) enters the diversion chamber (6); The air extraction valve (12) is used to control the direction of the detector inside the diversion chamber (6); the filter (13) is used to filter impurities in the air; the air pressure sensor (14) is used to detect the gas pressure in the pipeline; the liquid crystal display (8) is used to display various detection data values; the power switch (10) is the main power switch of the workbench, and the reset button (11) can realize the reset of the status of each electrical valve and sensor.

4. The method for intelligently inspecting excess material in aircraft fuel system pipelines according to claim 3, characterized in that: The detector (20) is a spherical device with a high-precision inertial navigation positioning sensor installed inside.

5. The method for intelligently inspecting excess material in aircraft fuel system pipelines according to claim 3, characterized in that: The outer surface of the detector (20) is wrapped with a soft plastic material to avoid scratching the inner wall of the pipeline.

6. The method for intelligently inspecting excess material in aircraft fuel system pipelines according to claim 3, characterized in that: The detection data values ​​displayed on the liquid crystal display screen (8) include sensor acquisition data, electrical valve switch status and excess object position information.

7. The method for intelligently inspecting excess material in aircraft fuel system pipelines according to claim 1, characterized in that: The specific steps of the intelligent inspection method for excess material in the aircraft fuel system pipeline are as follows: Step 1: According to the test requirements, N types of catheters are sequentially connected to the gas outlet pipes 25 of N channels of the workbench, and detectors (20) matching the sizes of the catheters of each type are prepared; Step 2: Turn on the power switch (10); according to the inner diameter of the conduit to be tested, N detectors (20) of different colors are sequentially placed into the inlet pipe (9); first, one of the detectors (20) is placed into the inlet pipe (9), and the grayscale sensor (21) identifies its color and transmits the information to the control system, which controls the inlet gate valve (19) to open, and the detector (20) enters the diversion chamber (6). Based on the color detection information, the system automatically matches the black detector (20) to channel one; Step 3: Turn on the vacuum pump (15), open the vacuum gate valve (12) of channel one, and the detector (20) enters the storage cavity (17) of channel one through suction and is fixed on the ventilation screen (16); Step 4: According to the above steps, the detectors (20) of the other four colors are sequentially placed into the inlet pipe (9). Similar to steps 2 and 3, the other four detectors (20) will automatically match to the storage chambers (17) of the corresponding channels; Step 5: Turn off the vacuum pump (15) and the vacuum gate valve (12), turn on the air blowing pump (4) and the air blowing gate valve (5), and the detectors (20) of the five channels will be blown into the five pipelines to start the detection of excess matter in the pipelines; Step 6: Observe whether there is a detector (20) blown out at the end of each channel conduit. If a detector is blown out, it proves that there is no excess material inside the conduit of this model. If no detector (20) is blown out at the end of a conduit, it proves that the detector (20) is blocked by excess material in the pipeline. Step 7: If there is excess material in the pipeline of a certain type of catheter in step 6, it is necessary to further determine the position of the excess material in the pipeline. The moving track of the detector (20) and the specific position in the catheter can be observed through the liquid crystal display screen 8. The position of the detector (20) is the position of the excess material in the pipe. After the position of the excess material is determined, the catheter is removed and the excess material is removed; Step 8: After the detection of excess objects is completed, the detector (20) is recovered, the states of each electrical valve and sensor are returned to the initial state through the reset button (11), and the workbench power switch (10) is turned off, and the detection is completed.

8. The method for intelligently inspecting excess material in aircraft fuel system pipelines according to claim 1, characterized in that: The automated testing workbench can be designed with a multi-channel testing mode to achieve simultaneous testing of multiple aircraft fuel system pipelines.

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