Airplane hydraulic conduit air tightness testing and excess screening device and self-checking method thereof

Abstract

The present application belongs to the field of aviation manufacturing engineering and aircraft assembly detection technology, and relates to a device for air tightness test and foreign matter screening of an aircraft hydraulic conduit and a self-checking method thereof. The automatic test bench of the present application adopts an intelligent control module and an AI recognition technology, can quickly identify the model of the conduit, and according to different models of the conduit, executes corresponding air tightness test procedures, can monitor the data state of each electrical valve and sensor in real time, and implements driving control. The foreign matter in the conduit is detected by using an ultrasonic wave mode, which can accurately determine whether there is foreign matter in the pipeline and the size of the foreign matter, and compared with the previous blowing test, realizes the upgrading change from the traditional detection mode to the intelligent detection technology. During the whole test process, the operator only needs to connect the conduit to the test bench and replace the conduit, and the test process does not need the operator to participate, thereby avoiding human interference factors and improving the test efficiency and detection accuracy.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of aviation manufacturing engineering and aircraft assembly detection technology, and relates to an aircraft hydraulic conduit air tightness test and excess screening device and a self-checking method thereof. BACKGROUND

[0002] An aircraft hydraulic system drives various mechanical devices through pressure, and a conduit undertakes the task of conveying and distributing hydraulic oil. The hydraulic system of an aircraft can be divided into two types: direct control action and indirect control action. The flaps, flap stabilizers, elevators, rudders, landing gears, shock absorbers and the like controlled by the pilot are controlled by the direct control action hydraulic system. In operation, hydraulic oil needs to be transmitted between numerous components and connected by conduits. The hydraulic conduit needs to have pressure bearing capacity, high temperature resistance and wear resistance during transmission. Therefore, the sealing performance of the hydraulic conduit and the pipe joint is particularly important. If the hydraulic pipeline leaks during operation, the hydraulic oil will leak, causing the hydraulic system to fail to drive various mechanical devices, which seriously affects the flight safety of the aircraft. At the same time, there should be no excess in the hydraulic pipeline. If there are foreign matters in the conduit, the hydraulic pipeline will be blocked, the hydraulic oil cannot be normally conveyed and distributed, the hydraulic system will malfunction, and major accidents such as failure of the aircraft control system, landing system and engine shutdown will occur.

[0003] At present, the air tightness detection of the hydraulic system is mainly performed by manual operation of a mechanical test bench. The operator manually adjusts the cut-off valve, safety valve, pressure reducing valve and other pneumatic components of the test bench, and manually observes and times the pressure maintaining time of the air tightness test to finally determine whether the air tightness of the pipe joint between the conduits is qualified. Since the valve value precision of each pneumatic component of the test bench is not high, the operator needs to frequently adjust the pneumatic components to maintain the design required test pressure value. The repeated manual adjustment may cause human operation errors, resulting in that the test conditions do not meet the requirements and the test effect is not achieved. At the same time, since different types of conduits require different air pressure values for air tightness test, the operator needs to repeatedly operate multiple safety valves and pressure reducing valves to set the air pressure value, resulting in a complicated operation process and low test efficiency.

[0004] Excess detection is mainly performed by conduit blowing test to remove the excess. The operator blows the conduit nozzle at the exhaust port, which is not ideal for blowing test. If the conduit has excess and is stuck inside, the blowing method cannot detect whether there is excess in the conduit. The air tightness test and excess screening of the conduit are very important for the realization of the functionality of the hydraulic system. In order to improve the detection efficiency and accuracy, it is urgent to design a self-checking method for the air tightness test and excess screening of the hydraulic conduit. SUMMARY

[0005] To solve the above problems, a kind of detection method for catheter airtightness and pipeline excess screening is provided, the method designs a kind of full-automatic airtight test bench device, realizes the rapid identification of different models of catheter by machine vision technology, realizes the automatic control of electrical valve by using intelligent control system and real-time communication of multiple electrical valves, can carry out the airtightness test of various models of hydraulic catheter;At the same time, the test bench is equipped with a kind of excess intelligent detection equipment, realizes the excess screening in hydraulic catheter by ultrasonic detection principle. Through the detection method, the airtightness of hydraulic catheter pipe joint and the rapid detection of catheter excess can be realized, the detection accuracy is improved, and the detection error caused by manual operation is avoided.

[0006] The technical scheme of the application is as follows:

[0007] According to the requirement of hydraulic catheter airtightness test, a kind of aircraft hydraulic catheter airtightness test and excess screening device is designed, which can realize the airtightness test of low pressure and high pressure type catheter through intelligent control detection system, and realize the excess screening of catheter through excess detection system of test bench.

[0008] As shown in the accompanying Figure 2 , the accompanying Figure 3 and the accompanying Figure 4 , the aircraft hydraulic catheter airtightness test and excess screening device includes body, air inlet, air outlet, camera, fixing bolt, support, power switch, reset button, valve display, excess display screen, airtightness state display screen, ultrasonic emission port, emission module, receiving module, ultrasonic receiving port, air inlet hose, air flow inductive sensor, air outlet hose, nitrogen cylinder, gas filter, total electric gate valve, low pressure electric gate valve, low pressure pressure reducing valve, low pressure safety valve, air pressure sensor, exhaust solenoid valve, high pressure safety valve, high pressure pressure reducing valve, high pressure electric gate valve, control system.

[0009] The machine body is the shell of the air tightness test bench, and the nitrogen cylinder, control system module, sensor and various electrical valves are installed inside. The gas inlet and gas outlet are installed on the machine body, the inside of the gas inlet is connected with the nitrogen cylinder, and the outside is connected with the starting end of the gas inlet hose and the pipe. The inside of the gas outlet is connected with the exhaust electromagnetic valve, and the outside is connected with the terminal end of the gas outlet hose and the pipe. The bracket is fixed on the machine body by two fixing bolts, and the camera is installed on the bracket. The camera is used for shooting and identifying the number of the lower pipe. The power switch and reset button are installed on the test bench. The power switch is used as the main switch of the test control console, which is used to start the control system. The reset button is used to restart the system program. When testing different types of pipes again, press the reset button. The valve display, excess display screen and air tightness display screen are fixed on the test bench, which is convenient for the operator to view the information. The valve display can display the opening and closing of each electrical valve and the threshold information. The excess display screen can display whether there is excess in the pipe and the size of the excess. The air tightness display screen can display whether the pipe air tightness is qualified and the leakage position. The ultrasonic wave transmitting port and the ultrasonic wave receiving port are fixed on the test bench and are connected with the gas inlet hose and the gas outlet hose respectively. The transmitting module and the receiving module are installed inside respectively. The ultrasonic wave is emitted by the transmitting module and received by the receiving module. The size of the ultrasonic wave signal analog quantity is judged, and then the excess in the pipe is judged. The airflow sensing sensor is fixed on the pipe joint connected with the pipe, which is used for detecting the leakage position of the pipe joint.

[0010] The control system adopts intelligent hardware control module, which is used to control the total electric gate valve, low pressure electric gate valve, low pressure pressure reducing valve, low pressure safety valve, gas pressure sensor, exhaust electromagnetic valve, high pressure safety valve, high pressure pressure reducing valve and high pressure electric gate valve. The total electric gate valve, low pressure electric gate valve and high pressure safety valve are used to control the opening and closing of the pipeline. The low pressure pressure reducing valve and the high pressure pressure reducing valve control the gas pressure of the low pressure channel and the high pressure channel respectively. The low pressure safety valve and the high pressure safety valve are used to protect the low pressure and high pressure pipeline. The gas pressure sensor is used to collect the pipeline pressure value and feedback to the air tightness display screen in real time. When the pipe test is finished, the exhaust electromagnetic valve is controlled to complete the pipeline exhaust. The gas filter is used to filter the gas in the nitrogen cylinder, which can ensure that the output gas is impurity-free and avoid damaging the inner wall of the pipe.

[0011] The self-checking method of the aircraft hydraulic pipe air tightness test and excess screening device is as follows:

[0012] Step one: make good preparation before test, check whether the pipe joint connection is perfect, and determine that the gas inlet, gas outlet, ultrasonic wave transmitting port and ultrasonic wave receiving port area of the test bench are clean and tidy. The operator should have the qualification to operate the test bench and be familiar with the whole test process.

[0013] Step two: the operator connects the inlet hose and the outlet hose to the starting end and the ending end of a certain type of catheter respectively, and connects them to the inlet and outlet of the test bench respectively;

[0014] Step three: catheter air tightness test. The operator turns on the power switch, the control system is powered on and starts to execute the test program, the camera identifies the number at the catheter port, for example, the number is "1", the system judges that the catheter is a low-pressure catheter. The control system drives the total electric gate valve and the low-pressure electric gate valve to open, the low-pressure pressure reducing valve is set to 0.500-0.600MPA, the low-pressure safety valve is set to 0.600-0.605MPA, and the valve display real-time displays the state of each electric valve;

[0015] Step four: the pipeline pressure is maintained for 20 minutes, the air pressure sensor real-time monitors the pipeline pressure value and displays it on the air tightness state display screen. If the air pressure sensor value is stable, it proves that the pipeline does not leak. If the air pressure sensor changes, it proves that the pipe joint leaks, and the airflow sensing sensor determines the leak point position;

[0016] Step five: after the air tightness test is completed, the pipeline is discharged through the exhaust electromagnetic valve. After the pipeline is pressure-free, the inlet hose and the outlet hose are connected to the ultrasonic wave transmitting port and the ultrasonic wave receiving port. By pressing the reset button, the system starts the excess material screening test of the low-pressure catheter. The transmitting module transmits ultrasonic waves to the pipeline, and the receiving module feeds back the received data to the control system. Through the feedback data, it can be judged whether there is excess material in the catheter and the size of the excess material. If there is excess material, the catheter is disassembled for excess material removal;

[0017] Step six: after the excess material test of the low-pressure catheter is completed, the inlet hose and the outlet hose are disassembled. The air tightness test of the next type of catheter is carried out. According to the above step two, the next type of catheter is connected to the test bench, the reset button is pressed, the system is restarted, and the camera identifies the number of the catheter port, for example, the number is "2", the system judges that the catheter is a high-pressure catheter. The control system drives the total electric gate valve and the high-pressure electric gate valve to open, the high-pressure pressure reducing valve is set to 2.800-2.900MPA, the high-pressure safety valve is set to 2.900-2.905MPA, and the valve display real-time displays the state of each electric valve;

[0018] Step seven: according to the above steps four and five, the air tightness test and the excess material screening of the high-pressure catheter are carried out. After the process is completed, the connecting hose is disassembled. In this way, the test procedures of other types of catheters are continued;

[0019] Step eight: after all the catheter tests are completed, the power switch is turned off, the scene is arranged, and the test records are made.

[0020] The beneficial effects of the application are as follows:

[0021] 1) The automatic test bench adopts an intelligent control module and AI recognition technology, which can quickly identify the type of catheter and perform corresponding air tightness test procedures according to different types of catheter. At the same time, it can monitor the data state of each electrical valve and sensor in real time and implement driving control.

[0022] 2) The ultrasonic method is used to detect the excess in the catheter, which can accurately determine whether there is excess in the pipeline and the size of the excess. Compared with the previous blowing test, it realizes the upgrading from traditional detection method to intelligent detection technology.

[0023] 3) During the entire test process, the operator only needs to connect the catheter to the test bench and replace the catheter. The test process does not require the operator to participate, avoiding human interference factors and improving test efficiency and detection accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic diagram of the connection of the catheter and the pipe joint;

[0025] Figure 2 is a schematic diagram of the shaft side of the automatic air tightness test console;

[0026] Figure 3 is a schematic diagram of the catheter connection state;

[0027] Figure 4 is a schematic diagram of the hydraulic catheter air tightness test.

[0028] Wherein, 1 - body, 2 - air inlet, 3 - air outlet, 4 - camera, 5 - fixing bolt, 6 - bracket, 7 - power switch, 8 - reset button, 9 - valve display, 10 - excess display screen, 11 - air tightness state display screen, 12 - ultrasonic wave transmitting port, 13 - transmitting module, 14 - receiving module, 15 - ultrasonic wave receiving port, 16 - air inlet hose, 17 - air flow sensing sensor, 18 - air outlet hose, 19 - nitrogen cylinder, 20 - gas filter, 21 - total electric gate valve, 22 - low pressure electric gate valve, 23 - low pressure pressure reducing valve, 24 - low pressure safety valve, 25 - air pressure sensor, 26 - exhaust electromagnetic valve, 27 - high pressure safety valve, 28 - high pressure pressure reducing valve, 29 - high pressure electric gate valve, 30 - control system.

[0029] SPECIFIC IMPLEMENTATION CASE

[0030] Example 1:

[0031] The self-checking method of the aircraft hydraulic catheter air tightness test and excess screening device is as follows:

[0032] 1. Hardware system construction and software design

[0033] The hardware control module of the automatic test bench adopts a high-performance module kit from NVIDIA, which is used for model training of images, control of various electrical valves and sensors, and detection of excess materials. The power module uses a 12V rechargeable lithium battery, which can convert 12V DC voltage to 5.0V and 3.3V through a voltage stabilizing module for power supply of the control module, sensors, and electrical valves. The image acquisition device uses a high-definition camera that can quickly acquire image information. Multiple liquid crystal displays are used, and the display and control chip use IIC communication protocol for data transmission, which can display the air tightness data of different types of catheters, the detection status of electrical valves, and excess materials. The software uses the PaddlePaddle framework for pattern sample processing and model training, compiles algorithms according to recognition requirements, and forms a training model with the help of a convolutional neural network (CNN) to realize catheter type recognition.

[0034] 2. Data acquisition and analysis

[0035] According to the different types of hydraulic catheters, on-site data collection is carried out. Different types of catheters require different air pressures during air tightness testing. The air tightness test pressure values of each type of catheter are recorded, and different pressure values are coded and marked, for example, the low-pressure catheter with a pressure of (0.500-0.600) MPA is marked with the number "1" at the pipe opening, the high-pressure catheter with a pressure of (2.800-2.900) MPA is marked with the number "2" at the pipe opening, and so on. According to the test requirements, the pipe openings of different pressure test catheters are marked with numbers.

[0036] 3. Catheter recognition method

[0037] The catheter is connected to the air inlet pipe of the test bench. Machine vision technology is used to identify the number at the pipe joint through a high-definition camera, and then determine which type of catheter it is. Through software program settings, according to different types of catheters, the safety valve and pressure reducing valve output corresponding air pressure range values, and give corresponding type of catheter for air tightness test.

[0038] 4. Air tightness test process

[0039] The starting end of the to-be-tested conduit is connected to the air inlet of the test bench through the air inlet hose, and the ending end of the conduit is connected to the air outlet of the test bench through the air outlet hose. 1) Turn on the power switch of the test bench, press the system reset button, and the test bench control module automatically executes according to the software program. First, the camera identifies the digital code of the conduit port, judges the conduit model, for example, if the conduit port number is “1”, the system starts the low-pressure conduit test channel, automatically opens the electric gate valve and pressure reducing valve of the low-pressure channel, sets the upper limit pressure value of the safety valve to (0.600-0.605) MPa for protecting the conduit, sets the pressure value of the pressure reducing valve to (0.500-0.600) MPa for subsequent conduit pressure test, and the air pressure sensor is used for monitoring the air pressure value; 2) After the gas in the gas cylinder enters the conduit, the exhaust electromagnetic valve is in the closed state, at this time the pressure in the conduit is (0.500-0.600) MPa, and the pressure test is performed for 20 minutes; 3) Observe the value change of the air pressure sensor, and the air pressure value is stable, which proves that the conduit is air-tight, and the air pressure value has obvious fluctuation, which proves that there is air leakage at the pipe joint; after the air-tight test is completed, the exhaust electromagnetic valve is automatically opened to complete the exhaust; 4) After the air-tight test of the conduit numbered “1” is completed, the reset button is pressed again, and the air-tight test of other low-pressure conduits is performed; 5) After the air-tight test of the low-pressure conduit is completed, the same method is used to perform the air-tight test of the high-pressure conduit according to the above steps.

[0040] 5. Air-tight detection mode

[0041] If the conduit has air leakage, the leakage points mainly occur at the pipe joints between the conduits, such as Figure 1 An air flow sensing sensor is arranged at the pipe joint, which is used for detecting the pipe joint leakage point. When it is found that the conduit pipeline is air-tight abnormally during the air-tight test, the air flow sensor can collect the air leakage information in real time and determine the position of the pipe joint leakage point.

[0042] 6. Excess detection mode

[0043] After the air-tight test is completed, the starting end of the conduit is connected to the ultrasonic wave emitting port of the test bench, the ending end of the conduit is connected to the ultrasonic wave receiving port of the test bench, and the ultrasonic wave frequency is set to (40-50) KHZ. Start the ultrasonic wave transmitter, the ultrasonic wave enters from the starting end of the conduit, the ultrasonic wave receiver collects the ultrasonic wave signal at the receiving port of the test bench, and according to the analog signal value collected by the ultrasonic wave receiver, it can be judged whether there is excess in the pipeline and the volume of the excess, such as if the analog signal value of the receiver is abnormal, the conduit is disassembled in time for excess cleaning.

[0044] Example 2:

[0045] Based on the requirements for airtightness testing of hydraulic ducts, an airtightness testing and foreign matter screening device for aircraft hydraulic ducts is designed. Through an intelligent control and detection system, it can realize airtightness testing of low-pressure and high-pressure ducts, and at the same time, it can realize foreign matter screening of ducts through the foreign matter detection system of the test bench.

[0046] As attached Figure 2 Appendix Figure 3 and attached Figure 4 As shown, the aircraft hydraulic duct airtightness test and foreign matter screening device comprises a fuselage 1, an air inlet 2, an exhaust outlet 3, a camera 4, fixing bolts 5, a bracket 6, a power switch 7, a reset button 8, a valve display 9, a foreign matter display screen 10, an airtightness status display screen 11, an ultrasonic transmitting port 12, a transmitting module 13, a receiving module 14, an ultrasonic receiving port 15, an air intake hose 16, an airflow sensing sensor 17, an exhaust hose 18, a nitrogen cylinder 19, a gas filter 20, a main electric gate valve 21, a low-pressure electric gate valve 22, a low-pressure pressure reducing valve 23, a low-pressure safety valve 24, a pressure sensor 25, an exhaust solenoid valve 26, a high-pressure safety valve 27, a high-pressure pressure reducing valve 28, a high-pressure electric gate valve 29, and a control system 30.

[0047] The main body 1 is the shell of the airtightness test bench, housing a nitrogen cylinder, control system module, sensors, and various electrical valves. Inlet 2 and outlet 3 are mounted on the main body 1. Inlet 2 is internally connected to a nitrogen cylinder 19 and externally connected to the beginning of a conduit via an inlet hose 16. Outlet 3 is internally connected to an exhaust solenoid valve 26 and externally connected to the end of a conduit via an outlet hose 18. A bracket 6 is fixed to the main body 1 by two fixing bolts 5. A camera 4 is mounted on the bracket 6 and is used for photographing and identifying the conduit numbers below. A power switch 7 and a reset button 8 are mounted on the test bench. The power switch serves as the main switch for the test control console, used to start the control system. The reset button is used to restart the system program; after replacing the conduit with a different model, pressing the reset button 8 will restart the test. Valve indicator 9, foreign matter display 10, and airtightness display 11 are fixed on the test bench for easy information viewing by the operator. Valve indicator 9 displays the on / off status and threshold information of each electrical valve. Foreign matter display 10 displays the presence and size of foreign matter in the conduit. Airtightness display 11 displays whether the conduit is airtight and the location of any leaks. Ultrasonic transmitting port 12 and ultrasonic receiving port 15 are fixed on the test bench and connected to the inlet hose 16 and outlet hose 18, respectively. Transmitting module 13 and receiving module 14 are installed inside each port. Ultrasonic waves are emitted by transmitting module 13 and received by receiving module 14. The magnitude of the ultrasonic signal is determined to assess the presence of foreign matter in the conduit. Airflow sensor 17 is fixed at the pipe joint connecting the conduit for detecting leaks at the joint.

[0048] The control system 30 employs an intelligent hardware control module to control the main electric gate valve 21, low-pressure electric gate valve 22, low-pressure pressure reducing valve 23, low-pressure safety valve 24, pressure sensor 25, exhaust solenoid valve 26, high-pressure safety valve 27, high-pressure pressure reducing valve 28, and high-pressure electric gate valve 29. The main electric gate valve 21, low-pressure electric gate valve 22, and high-pressure safety valve 27 control the opening and closing of the pipeline. The low-pressure pressure reducing valve 23 and high-pressure pressure reducing valve 28 control the gas pressure in the low-pressure and high-pressure channels, respectively. The low-pressure safety valve 24 and high-pressure safety valve 27 protect the low-pressure and high-pressure pipelines. The pressure sensor 25 collects pipeline pressure values ​​and provides real-time feedback to the airtightness display screen 11. After the conduit test is completed, the exhaust solenoid valve 26 is controlled to complete the venting of the pipeline. The gas filter 20 filters the gas in the nitrogen cylinder 19 to ensure that the output gas is free of impurities and to avoid damage to the inner wall of the conduit.

[0049] Example 3:

[0050] The self-inspection method for aircraft hydraulic duct airtightness testing and foreign matter screening devices is as follows:

[0051] Step 1: Complete the pre-test preparations, check that the pipe connections are intact, and ensure that the air inlet 2, exhaust outlet 3, ultrasonic transmitter port 12, and ultrasonic receiver port 15 areas of the test bench are clean and tidy. Operators must be qualified to operate the test bench and be familiar with the entire test procedure.

[0052] Step 2: The operator connects the inlet hose 16 and the outlet hose 18 to the starting and ending ends of a certain type of conduit, respectively, and connects the other end to the inlet 2 and outlet 3 of the test bench.

[0053] Step 3: Conduit airtightness test. The operator turns on the power switch 7, the control system 30 is powered on and begins to execute the test procedure. The camera 4 identifies the number at the conduit port, for example, if the number is "1", the system determines that the conduit is a low-pressure conduit. The control system 30 drives the main electric gate valve 21 and the low-pressure electric gate valve 22 to open, the low-pressure pressure reducing valve 23 is set to 0.500-0.600MPa, the low-pressure safety valve 24 is set to 0.600-0.605MPa, and the valve display 9 displays the status of each electric valve in real time.

[0054] Step 4: Pressurize the pipeline for 20 minutes. The pressure sensor 25 monitors the pipeline pressure value in real time and displays it on the airtightness display screen 11. If the pressure sensor 25 value is stable, it proves that the pipeline is not leaking. If the pressure sensor 25 value changes, it proves that there is a leak at the pipe joint. The leak location is determined by the airflow sensing sensor 17.

[0055] Step five: after the air tightness test is completed, the pipeline is discharged through the exhaust solenoid valve 26, and after the pipeline is no pressure, the inlet hose 16 and the outlet hose 18 are removed, the inlet hose 16 and the outlet hose 18 are connected at the ultrasonic wave transmitting port 12 and the ultrasonic wave receiving port 15, the system starts the excess material screening test of the low pressure catheter by pressing the reset button 8, the transmitting module 13 transmits ultrasonic waves to the pipeline, the receiving module 14 feeds back the received data to the control system, whether there is excess material in the catheter and the size of the excess material can be judged through the feedback data, if there is excess material, the catheter is disassembled to remove the excess material;

[0056] Step six: after the excess material test of the low pressure catheter is completed, the inlet hose 16 and the outlet hose 18 are removed. The air tightness test of the next type of catheter is carried out. According to the above step two, the next type of catheter is connected to the test bench, the system is restarted by pressing the reset button 8, the camera 4 is used to identify the number of the pipe mouth, for example, the number is "2", the system judges that the type of catheter is high pressure catheter, the control system 30 drives the total electric gate valve 21 and the high pressure electric gate valve 29 to open, the high pressure pressure reducing valve 23 is set to 2.800-2.900MPA, the high pressure safety valve 24 is set to 2.900-2.905MPA, and the valve display 9 displays the state of each electric valve in real time;

[0057] Step seven: according to the above step four and step five, the air tightness test and excess material screening of the high pressure catheter are carried out, and after the process is completed, the connecting hose is disassembled. In this way, the test process of other types of catheters is continued;

[0058] Step eight: after all the catheter tests are completed, the power switch 7 is turned off, the scene is arranged, and the test record is made.

Claims

1. An aircraft hydraulic conduit air tightness testing and excess material screening apparatus, characterized in that, The machine body (1), the air inlet (2), the air outlet (3), the camera (4), the support (6), the power switch (7), the reset button (8), the valve display (9), the excess display screen (10), the air tightness display screen (11), the ultrasonic wave transmitting port (12), the transmitting module (13), the receiving module (14), the ultrasonic wave receiving port (15), the air inlet hose (16), the air flow sensing sensor (17), the air outlet hose (18), the nitrogen cylinder (19), the gas filter (20), the total electric gate valve (21), the low pressure electric gate valve (22), the low pressure pressure reducing valve (23), the low pressure safety valve (24), the air pressure sensor (25), the exhaust solenoid valve (26), the high pressure safety valve (27), the high pressure pressure reducing valve (28), the high pressure electric gate valve (29) and the control system (30) are included. The air inlet (2) and the air outlet (3) are installed on the machine body (1), the inside of the air inlet (2) is connected with the nitrogen cylinder (19), the outside is connected with the air inlet hose (16) and the beginning end of the pipeline, the inside of the air outlet (3) is connected with the exhaust solenoid valve (26), the outside is connected with the air outlet hose (18) and the end of the pipeline; the support (6) is fixed on the machine body (1) through two fixing bolts (5), the camera (4) is installed on the support (6), the camera (4) is used for the identification of the photograph of the pipeline number below, different types of pipelines are used in the test, and corresponding air tightness test procedures are performed; the power switch (7) and the reset button (8) are installed on the test bench; the valve display (9), the excess display screen (10) and the air tightness display screen (11) are fixed on the test bench, the valve display (9) can display the opening and closing and threshold information of each electric valve; the ultrasonic wave transmitting port (12) and the ultrasonic wave receiving port (15) are fixed on the test bench, are connected with the air inlet hose (16) and the air outlet hose (18) respectively, and the inside is respectively provided with the transmitting module (13) and the receiving module (14), the ultrasonic wave is emitted by the transmitting module (13), the ultrasonic wave signal is received by the receiving module (14), the size of the ultrasonic wave signal analog quantity is judged, and then the excess in the pipeline is judged; The control system (30) is used for controlling the total electric gate valve (21), the low pressure electric gate valve (22), the low pressure pressure reducing valve (23), the low pressure safety valve (24), the air pressure sensor (25), the exhaust solenoid valve (26), the high pressure safety valve (27), the high pressure pressure reducing valve (28) and the high pressure electric gate valve (29).

2. The aircraft hydraulic conduit air tightness testing and excess material screening device of claim 1, wherein, The total electric gate valve (21), the low pressure electric gate valve (22) and the high pressure safety valve (27) are used for controlling the opening and closing of the pipeline, the low pressure pressure reducing valve (23) and the high pressure pressure reducing valve (28) are used for controlling the gas pressure of the low pressure channel and the high pressure channel respectively, and the low pressure safety valve (24) and the high pressure safety valve (27) are used for protecting the low pressure pipeline and the high pressure pipeline.

3. An aircraft hydraulic conduit air tightness testing and excess material screening apparatus as claimed in claim 1 or 2, wherein, The air pressure sensor (25) is used for collecting the pipeline pressure value and feeding back to the air tightness display screen (11) in real time; when the pipeline test is completed, the exhaust solenoid valve (26) is controlled to complete the pipeline exhaust.

4. The aircraft hydraulic conduit air tightness testing and excess material screening apparatus of claim 1 or 2, wherein, The gas filter (20) is used for filtering the gas in the nitrogen cylinder (19), ensuring that the output gas is free of impurities, and avoiding damage to the inner wall of the conduit.

5. The aircraft hydraulic conduit air tightness testing and excess material screening device of claim 3, wherein, The gas filter (20) is used for filtering the gas in the nitrogen cylinder (19), ensuring that the output gas is free of impurities, and avoiding damage to the inner wall of the conduit.

6. The aircraft hydraulic conduit air tightness testing and excess material screening apparatus of claim 1 or 2 or 5, wherein, The gas flow sensing sensor (17) is fixed at the pipe joint connected to the conduit, and is used for detecting the leakage position of the pipe joint.

7. The aircraft hydraulic conduit air tightness testing and foreign object debris screening device of claim 3, wherein, The gas flow sensing sensor (17) is fixed at the pipe joint connected to the conduit, and is used for detecting the leakage position of the pipe joint.

8. The aircraft hydraulic conduit air tightness testing and excess material screening device of Claim 4, wherein, The gas flow sensing sensor (17) is fixed at the pipe joint connected to the conduit, and is used for detecting the leakage position of the pipe joint.

9. The self-checking method of an aircraft hydraulic conduit airtightness testing and excess material screening device according to any one of claims 1 to 8, characterized in that, The steps are as follows: Step one: make good preparation before the test, check whether the pipe joint connection is perfect, and determine that the air inlet (2), the air outlet (3), the ultrasonic wave emitting port (12), and the ultrasonic wave receiving port (15) area of the test table are clean and tidy; Step two: the operator connects the air inlet hose (16) and the air outlet hose (18) to the starting end and the ending end of a certain type of conduit respectively, and connects the other side to the air inlet (2) and the air outlet (3) of the test table; Step three: conduit airtightness test; the operator turns on the power switch (7), the control system (30) is powered on and starts to execute the test program, the camera (4) identifies the number of the conduit pipe; the control system (30) drives the total electric gate valve (21) and the low-pressure electric gate valve (22) to open; Step four: the pipeline pressure is maintained for 20 minutes, the gas pressure sensor (25) monitors the pipeline pressure value in real time and shows it on the airtightness display screen (11); if the gas pressure sensor (25) value is stable, it proves that the pipeline is airtight; if the gas pressure sensor (25) changes, it proves that the pipe joint has a gas leakage, and the leakage position is determined by the gas flow sensing sensor (17); Step five: after the airtightness test is completed, the pipeline is discharged through the exhaust electromagnetic valve (26), and after the pipeline is pressureless, the air inlet hose (16) and the air outlet hose (18) are disconnected, the air inlet hose (16) and the air outlet hose (18) are connected to the ultrasonic wave emitting port (12) and the ultrasonic wave receiving port (15), and the system starts to perform the excess material screening test of the low-pressure conduit by pressing the reset button (8); the emission module (13) emits ultrasonic waves to the pipeline, and the receiving module (14) feeds back the received data to the control system, and the feedback data can be used to judge whether there is excess material in the conduit and the volume of the excess material; Step six: after the excess material test of the low-pressure conduit is completed, the air inlet hose (16) and the air outlet hose (18) are removed; the airtightness test of the next type of conduit is carried out; according to the above step two, the next type of conduit is connected to the test table, the reset button (8) is pressed to restart the system, and the camera (4) identifies the pipe number; Step seven: according to the above steps four and five, the airtightness test and excess material screening of the high-pressure conduit are carried out, and after the process is completed, the connected hose is removed; Step eight: after all the conduit tests are completed, turn off the power switch (7), tidy up the scene, and make test records.

10. The method of self-checking of an aircraft hydraulic conduit air tightness testing and foreign object screening apparatus of claim 9, wherein, The low-pressure pressure reducing valve (23) is set to 0.500-0.600 MPA, the low-pressure safety valve (24) is set to 0.600-0.605 MPA, and the valve display (9) displays the state of each electric valve in real time.

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