Airtight test and redundant object screening device for aircraft hydraulic conduit and self-checking method of airtight test and redundant object screening device

Abstract

The invention belongs to the technical field of aeronautical manufacturing engineering and aircraft assembly detection, and relates to an aircraft hydraulic conduit airtight test and redundancy screening device and a self-checking method thereof. According to the automatic test bed, the intelligent control module and the AI recognition technology are adopted, the models of the conduits can be quickly recognized, corresponding airtight test procedures are executed according to the conduits of different models, meanwhile, the data states of all the electrical valves and sensors can be monitored in real time, and driving control is implemented. The ultrasonic mode is adopted for detecting the redundant substances in the guide pipe, whether the redundant substances exist in the pipeline or not and the size of the redundant substances can be accurately judged, and compared with a previous blowing test, upgrading conversion from a traditional detection mode to an intelligent detection technology is achieved. In the whole test process, an operator only needs to connect the guide pipe with the test bed and replace the guide pipe, the test process does not need the operator to participate, human interference factors are avoided, and the test efficiency and the detection accuracy are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation manufacturing engineering and aircraft assembly detection, and relates to an aircraft hydraulic conduit airtightness test and excess material screening device and a self-checking method thereof. Background Art

[0002] The aircraft hydraulic system drives various mechanical devices through pressure, and the conduit is responsible for the delivery and distribution of hydraulic oil. The hydraulic system of the aircraft can be divided into two types: direct control and indirect control. The flaps, flap stabilizers, elevators, rudders, and landing gears are directly operated by the pilot. Shock absorbers are controlled by the direct control hydraulic system. During work, hydraulic oil needs to be transmitted between many parts and connected with conduits. When transmitting, the hydraulic conduit needs to have pressure bearing capacity, high temperature resistance, wear resistance and other properties. Therefore, the sealing of hydraulic conduits and pipe joints is particularly important. If the hydraulic pipeline leaks oil during work, it will cause hydraulic oil leakage, resulting in failure of the hydraulic system function, inability to drive various mechanical devices, and seriously affecting the flight safety of the aircraft. At the same time, there should be no excess in the hydraulic pipeline. If there is foreign matter in the conduit, it will cause the hydraulic pipeline to be blocked, the hydraulic oil cannot be normally delivered and distributed, and the hydraulic system function will be abnormal, causing major accidents such as failure of the aircraft control system and landing system and engine shutdown.

[0003] At present, the air tightness test of hydraulic systems is mainly carried out through manually operated mechanical test benches. The operator manually adjusts the pneumatic components such as the stop valve, safety valve, and pressure reducing valve of the test bench, and manually observes and times the pressure holding time of the air tightness test to finally determine whether the air tightness of the pipe joints between the conduits is qualified. Since the valve accuracy set for each pneumatic component of the test bench is not high, the operator needs to frequently adjust the pneumatic components to maintain the test pressure value required by the design. Multiple manual adjustments will cause human operating errors, resulting in test conditions that do not meet the requirements and fail to achieve the test effect. At the same time, since the air tightness tests of different types of conduits require different air pressure values, the operator needs to repeatedly operate multiple safety valves and pressure reducing valves to set the air pressure value, resulting in cumbersome operation procedures and low test efficiency.

[0004] Excess material detection is mainly carried out through the duct blowing test to remove excess material. The operator places the duct mouth at the exhaust port to blow air. This method of blowing test is not ideal, and if there is excess material in the duct and it is stuck inside, the blowing method cannot detect whether there is excess material in the duct. The air tightness test and excess material screening of the duct are very important for the realization of the functionality of the hydraulic system. In order to improve the efficiency and accuracy of the detection, it is urgent to design a self-test method for the air tightness test and excess material screening of the hydraulic duct. Summary of the invention

[0005] In order to solve the above problems, a detection method for the air tightness of the conduit and the screening of excess materials in the pipeline is invented. The method designs a fully automatic air tightness test bench device, realizes the rapid identification of different types of conduits through machine vision technology, adopts an intelligent control system to communicate with a variety of electrical valves in real time, realizes the automatic control of electrical valves, and can perform air tightness tests on various types of hydraulic conduits; at the same time, the test bench is equipped with an intelligent detection device for excess material identification, which realizes the screening of excess materials in the hydraulic conduit through the principle of ultrasonic detection. The detection method can realize the rapid detection of the air tightness of the hydraulic conduit joint and the excess materials in the conduit, improves the detection accuracy, and avoids the detection errors caused by human operation.

[0006] The technical solution of the present invention is as follows:

[0007] According to the requirements of hydraulic duct air tightness test, an aircraft hydraulic duct air tightness test and excess material screening device is designed. Through the intelligent control detection system, the air tightness test of low-pressure and high-pressure model ducts can be realized. At the same time, the excess material screening of the duct is realized through the excess material detection system of the test bench.

[0008] As attached Figure 2 , Attachment Figure 3 and attached Figure 4 As shown, the aircraft hydraulic duct air tightness test and excess material screening device includes an airframe, an air inlet, an exhaust port, a camera, fixing bolts, a bracket, a power switch, a reset button, a valve display, an excess material display screen, an air tightness status display screen, an ultrasonic transmitting port, a transmitting module, a receiving module, an ultrasonic receiving port, an air inlet hose, an air flow sensing sensor, an air outlet hose, a nitrogen bottle, a gas filter, a main electric gate valve, a low-pressure electric gate valve, a low-pressure reducing valve, a low-pressure safety valve, an air pressure sensor, an exhaust solenoid valve, a high-pressure safety valve, a high-pressure reducing valve, a high-pressure electric gate valve, and a control system.

[0009] The machine body is the shell of the airtight test bench, and nitrogen bottles, control system modules, sensors and various electrical valves are installed inside. The air inlet and exhaust port are installed on the machine body. The inside of the air inlet is connected to the nitrogen bottle, and the outside is connected to the starting end of the conduit through the air inlet hose. The inside of the exhaust port is connected to the exhaust solenoid valve, and the outside is connected to the terminal end of the conduit through the air outlet hose. The bracket is fixed to the machine body by two fixing bolts, and the camera is installed on the bracket. The camera is used to take pictures and identify the number of the conduit below. The power switch and reset button are installed on the test bench. The power switch is used as the main switch of the test console to start the control system. The reset button is used to restart the system program. When the different types of conduits are replaced and tested again, just press the reset button. The valve display, excess display screen and airtight status display screen are fixed on the test bench to facilitate the operator to view information. The valve display can display the switch and threshold information of each electrical valve. The excess display screen can display whether there is excess in the conduit and the volume of the excess. The airtight status display screen can display whether the conduit is airtight and the location of the leak. The ultrasonic transmitting port and the ultrasonic receiving port are fixed on the test bench and connected to the air inlet hose and the air outlet hose respectively. The transmitting module and the receiving module are installed inside. The ultrasonic wave is emitted by the transmitting module, and the ultrasonic signal is received by the receiving module to judge the size of the ultrasonic signal analog quantity, and then judge the situation of the excess in the duct. The airflow sensor is fixed at the pipe joint where the duct is connected, and is used to detect the leak point of the pipe joint.

[0010] The control system uses an intelligent hardware control module to control the main 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 and high-pressure electric gate valve. The main electric gate valve, low-pressure electric gate valve and high-pressure safety valve are used to control the switch of the pipeline. The low-pressure pressure reducing valve and 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 high-pressure safety valve are used to protect the low-pressure and high-pressure pipelines. The air pressure sensor is used to collect the pipeline pressure value and feed it back to the airtight status display screen in real time. When the catheter test is completed, the exhaust solenoid valve is controlled to complete the exhaust of the pipeline. The gas filter is used to filter the gas in the nitrogen bottle to ensure that the output gas is free of impurities and avoid damage to the inner wall of the catheter.

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

[0012] Step 1: Make preparations before the test, check whether the pipe joints are connected properly, and make sure that the air inlet, exhaust port, ultrasonic transmitting port, and ultrasonic receiving port of the test bench are clean and tidy. The operator must be qualified to operate the test bench and be familiar with the entire test process;

[0013] Step 2: The operator connects the air inlet hose and the air outlet hose to the starting end and the ending end of a certain type of conduit, and connects the other side to the air inlet and the air outlet of the test bench;

[0014] Step 3: Catheter air tightness test. The operator turns on the power switch, the control system is powered on and starts to execute the test procedure. The camera recognizes the number at the catheter mouth, for example, the number is "1", and the system determines that this type of catheter is a low-pressure catheter. The control system drives the main 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 shows the status of each electrical valve in real time;

[0015] Step 4: Maintain the pipeline pressure for 20 minutes. The air pressure sensor monitors the pipeline pressure value in real time and displays it on the airtight status display. If the air pressure sensor value is stable, it proves that the pipeline is not leaking. If the air pressure sensor changes, it proves that there is a leak in the pipe joint. The leak point is determined by the air flow sensor;

[0016] Step 5: After the airtight test is completed, deflate the pipeline through the exhaust solenoid valve. When there is no pressure in the pipeline, remove the air inlet hose and the air outlet hose, and connect the air inlet hose and the air outlet hose to the ultrasonic transmitting port and the ultrasonic receiving port. By pressing the reset button, the system starts the excess material screening test of the low-pressure conduit. The transmitting module transmits ultrasonic waves into the pipeline, and the receiving module feeds back the received data to the control system. The feedback data can be used to determine whether there is excess material in the conduit and the size of the excess material. If there is excess material, disassemble the conduit to remove the excess material;

[0017] Step six: After the redundant material test of the low-pressure duct is completed, remove the air inlet hose and the air outlet hose. Perform an airtight test on the next type of duct. According to the above step two, connect the next type of duct to the test bench, press the reset button to restart the system, and also use the camera to identify the pipe mouth number, for example, the number is "2", the system determines that this type of duct is a high-pressure duct, and the control system drives the main electric gate valve and the high-pressure electric gate valve to open. The high-pressure reducing valve is set to 2.800-2.900MPA, and the high-pressure safety valve is set to 2.900-2.905MPA. The valve display shows the status of each electrical valve in real time;

[0018] Step 7: Perform air tightness test and excess material screening of high pressure conduit according to the above steps 4 and 5. After the process is completed, remove the connecting hose. Continue to complete the test process of other types of conduits in the same way;

[0019] Step 8: After all catheter tests are completed, turn off the power switch, tidy up the site, and keep test records.

[0020] Beneficial effects of the present invention:

[0021] 1) The automated test bench uses an intelligent control module and AI recognition technology, which can quickly identify the catheter model and execute the corresponding airtight test process according to the different catheter models. At the same time, it can monitor the data status of each electrical valve and sensor in real time and implement drive control.

[0022] 2) The use of ultrasonic method to detect excess matter in the catheter can accurately determine whether there is excess matter in the pipeline and the size of the excess matter. Compared with the previous wind blowing test, it has achieved an upgrade from traditional detection methods 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 THE DRAWINGS

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

[0025] Figure 2 This is a schematic diagram of the axial side of the automated airtightness test console;

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

[0027] Figure 4 This is the schematic diagram of the hydraulic conduit air tightness test.

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

[0029] Specific implementation cases

[0030] Embodiment 1:

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

[0032] 1. Hardware system construction and software design

[0033] The hardware control module of the automated test bench uses NVIDIA's high-computing module kit, which is used for image model training, control of various electrical valves and sensors, and detection of excess objects. The power module uses a 12V rechargeable lithium battery, which can convert the 12V DC voltage into 5.0V and 3.3V through the voltage regulator module for power supply to the control module, sensor, and electrical valve. The image acquisition device uses a high-definition camera to quickly collect image information. Multiple LCD screens are used, and the display screen and control chip use the IIC communication protocol for data transmission, which can realize the airtight data display of different types of catheters, the detection status of electrical valves and excess objects. The software uses the PaddlePaddle framework for pattern sample processing and model training, compiles algorithms according to recognition requirements, and uses the convolutional neural network CNN to form a training model to realize the recognition of catheter models.

[0034] 2. Data Collection and Analysis

[0035] On-site data collection is performed according to different models of hydraulic conduits. Different models of conduits require different air pressures when performing air tightness tests. The air tightness test pressure value of each model of conduit is recorded, and different pressure values ​​are coded and marked. For example, the number "1" is marked at the pipe mouth of the low-pressure conduit of (0.500-0.600)MPA, and the number "2" is marked at the pipe mouth of the high-pressure conduit of (2.800-2.900)MPA, and so on. According to the test requirements, the pipe mouths of the conduits for different pressure tests are numbered.

[0036] 3. Catheter identification method

[0037] Connect the conduit to the air inlet of the test bench, use machine vision technology, and use a high-definition camera to identify the number on the pipe joint to determine the type of conduit. Through the setting of the software program, according to the different types of conduits, drive the safety valve and pressure reducing valve to output the corresponding air pressure range value, and give the corresponding type of conduit an airtight test.

[0038] 4. Airtightness test process

[0039] Connect the starting end of the catheter to be tested to the air inlet of the test bench through the air inlet hose, and connect the terminal end of the catheter to the exhaust port of the test bench through the air outlet hose. 1) Turn on the power switch of the test bench and press the system reset button. The test bench control module automatically executes according to the software program. First, the camera recognizes the digital code of the catheter mouth and determines the catheter model. For example, if the catheter mouth is numbered "1", the system starts the low-pressure catheter test channel and automatically opens the electric gate valve and pressure reducing valve of the low-pressure channel. At the same time, the upper limit pressure of the safety valve is set to (0.600-0.605) MPA to protect this type of catheter. The pressure of the pressure reducing valve is set to (0.500-0.600) MPA for subsequent catheter pressure maintenance tests. The air pressure sensor is used to monitor the gas pressure value; 2) After the gas from the cylinder enters the catheter, the exhaust solenoid valve is in a closed state. At this time The pressure inside the catheter is (0.500-0.600) MPA, and the pressure test is carried out for 20 minutes; 3) Observe the changes in the value of the air pressure sensor. A stable air pressure value proves that the catheter is airtight. An obvious fluctuation in the air pressure value proves that there is a leak at the pipe joint; after the airtight test is completed, the exhaust solenoid valve automatically opens to complete the exhaust; 4) After completing the airtight test of catheter numbered "1", press the reset button again to carry out airtight tests on other low-pressure model catheters; 5) After completing the airtight test of the low-pressure catheter, use the same method and follow the above steps to identify the catheter model, for example, if the catheter port is numbered "2", start the high-pressure test channel and carry out an airtight test on the high-pressure catheter.

[0040] 5. Airtightness detection method

[0041] If there is leakage in the catheter, the leakage point mainly occurs at the pipe joints between the catheters, such as Figure 1 An airflow sensing sensor is set at the pipe joint to detect the leakage point of the pipe joint. During the airtight test, if the airtightness of a certain type of conduit pipeline is abnormal, the airflow sensor will collect the leakage information in real time and determine the location of the leakage point of the pipe joint.

[0042] 6. Redundant object detection method

[0043] After the airtight test is completed, the starting end of the conduit is connected to the ultrasonic transmitting port of the test bench, and the ending end of the conduit is connected to the ultrasonic receiving port of the test bench. The ultrasonic frequency is set to (40-50) KHZ. Start the ultrasonic transmitter, and the ultrasonic wave enters from the starting end of the conduit. The ultrasonic receiver collects the ultrasonic signal at the receiving port of the test bench. According to the analog signal value collected by the ultrasonic receiver, it can be judged whether there is any excess material in the pipeline and the volume of the excess material. If the analog signal value of the receiver is found to be abnormal, the conduit should be disassembled in time to clean up the excess material.

[0044] Embodiment 2:

[0045] According to the requirements of hydraulic duct air tightness test, an aircraft hydraulic duct air tightness test and excess material screening device is designed. Through the intelligent control detection system, the air tightness test of low-pressure and high-pressure model ducts can be realized. At the same time, the excess material screening of the duct is realized through the excess material detection system of the test bench.

[0046] As attached Figure 2 , Attachment Figure 3 and attached Figure 4 As shown, the aircraft hydraulic duct air tightness test and excess material screening device includes a body 1, an air inlet 2, an exhaust port 3, a camera 4, a fixing bolt 5, a bracket 6, a power switch 7, a reset button 8, a valve display 9, an excess material display screen 10, an air tightness 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 air flow sensing sensor 17, an air outlet hose 18, a nitrogen bottle 19, a gas filter 20, a main electric gate valve 21, a low-pressure electric gate valve 22, a low-pressure reducing valve 23, a low-pressure safety valve 24, an air pressure sensor 25, an exhaust solenoid valve 26, a high-pressure safety valve 27, a high-pressure reducing valve 28, a high-pressure electric gate valve 29, and a control system 30.

[0047] The body 1 is the shell of the airtight test bench, and a nitrogen bottle, a control system module, a sensor, and various electrical valves are installed inside. The air inlet 2 and the exhaust port 3 are installed on the body 1. The inside of the air inlet 2 is connected to the nitrogen bottle 19, and the outside is connected to the starting end of the catheter through the air inlet hose 16. The exhaust port 3 is connected to the exhaust solenoid valve 26, and the outside is connected to the terminal end of the catheter through the air outlet hose 18. The bracket 6 is fixed to the body 1 by two fixing bolts 5. The camera 4 is installed on the bracket 6. The camera 4 is used for photographic identification of the catheter number below. The power switch 7 and the reset button 8 are installed on the test bench. The power switch is used as the main switch of the test console to start the control system. The reset button is used to restart the system program. When the different types of catheters are replaced and tested again, just press the reset button 8. The valve display 9, the excess display screen 10 and the airtight status display screen 11 are fixed on the test bench to facilitate the operator to view information. The valve display 9 can display the switch and threshold information of each electrical valve, the excess display screen 10 can display whether there is excess in the conduit and the volume of the excess, and the airtight status display screen 11 can display whether the conduit is airtight and the location of the leak. The ultrasonic transmitting port 12 and the ultrasonic receiving port 15 are fixed on the test bench, respectively connected to the air inlet hose 16 and the air outlet hose 18, and the transmitting module 13 and the receiving module 14 are respectively installed inside. The ultrasonic wave is emitted by the transmitting module 13, and the ultrasonic signal is received by the receiving module 14 to judge the size of the ultrasonic signal analog quantity, and then judge the situation of the excess in the conduit. The airflow sensing sensor 17 is fixed at the pipe joint where the conduit is connected, and is used to detect the leak point position of the pipe joint.

[0048] The control system 30 uses an intelligent hardware control module to control the main 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. The main electric gate valve 21, the low-pressure electric gate valve 22 and the high-pressure safety valve 27 are used to control the switch of the pipeline. The low-pressure pressure reducing valve 23 and the high-pressure pressure reducing valve 28 control the gas pressure of the low-pressure channel and the high-pressure channel respectively. The low-pressure safety valve 24 and the high-pressure safety valve 27 are used to protect the low-pressure and high-pressure pipelines. The air pressure sensor 25 is used to collect the pipeline pressure value and feed it back to the airtight status display screen 11 in real time. When the catheter test is completed, the exhaust solenoid valve 26 is controlled to complete the exhaust of the pipeline. The gas filter 20 is used to filter the gas in the nitrogen bottle 19 to ensure that the output gas is free of impurities and avoid damage to the inner wall of the catheter.

[0049] Embodiment 3:

[0050] The self-test method for the air tightness test of the aircraft hydraulic duct and the excess object screening device is as follows:

[0051] Step 1: Make preparations before the test, check whether the pipe joints are connected properly, and make sure that the air inlet 2, exhaust port 3, ultrasonic transmitting port 12, and ultrasonic receiving port 15 of the test bench are clean and tidy. The operator must be qualified to operate the test bench and be familiar with the entire test process;

[0052] Step 2: 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 bench;

[0053] Step 3: Catheter air tightness test. The operator turns on the power switch 7, the control system 30 is powered on and starts to execute the test procedure. The camera 4 identifies the number at the catheter mouth, for example, the number is "1", and the system determines that this type of catheter is a low-pressure catheter. 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 electrical valve in real time;

[0054] Step 4: Maintain the pipeline pressure for 20 minutes. The air pressure sensor 25 monitors the pipeline pressure value in real time and displays it on the airtight status display screen 11. If the value of the air pressure sensor 25 is stable, it proves that the pipeline is not leaking. If the air pressure sensor 25 changes, it proves that there is a leak in the pipe joint. The leak point is determined by the air flow sensor 17;

[0055] Step 5: After the airtightness test is completed, the pipeline is deflated through the exhaust solenoid valve 26. When there is no pressure in the pipeline, the air inlet hose 16 and the air outlet hose 18 are removed, and the air inlet hose 16 and the air outlet hose 18 are connected to the ultrasonic transmitting port 12 and the ultrasonic receiving port 15. By pressing the reset button 8, the system starts the redundant object screening test of the low-pressure conduit. The transmitting module 13 transmits ultrasonic waves into the pipeline, and the receiving module 14 feeds back the received data to the control system. The feedback data can be used to determine whether there is redundant object in the conduit and the size of the redundant object. If there is redundant object, the conduit is disassembled to remove the redundant object;

[0056] Step six: After the redundant material test of the low-pressure conduit is completed, remove the air inlet hose 16 and the air outlet hose 18. Perform an airtight test on the next type of conduit. According to the above step two, connect the next type of conduit to the test bench, press the reset button 8 to restart the system, and also identify the pipe mouth number through the camera 4, for example, the number is "2", the system determines that the conduit of this model is a high-pressure conduit, and the control system 30 drives the main electric gate valve 21 and the high-pressure electric gate valve 29 to open, the high-pressure reducing valve 23 is set to 2.800-2.900MPA, and the high-pressure safety valve 24 is set to 2.900-2.905MPA. The valve display 9 displays the status of each electrical valve in real time;

[0057] Step 7: Perform air tightness test and excess material screening of high pressure conduit according to the above steps 4 and 5. After the process is completed, remove the connecting hose. Continue to complete the test process of other types of conduits in the same way;

[0058] Step 8: After all catheter tests are completed, turn off the power switch 7, tidy up the site, and make test records.

Claims

1. Aircraft hydraulic duct air tightness test and excess material screening device, characterized in that: It comprises a body (1), an air inlet (2), an air outlet (3), a camera (4), a bracket (6), a power switch (7), a reset button (8), a valve display (9), a surplus display screen (10), an airtight status display screen (11), an ultrasonic transmitting port (12), a transmitting module (13), a receiving module (14), an ultrasonic receiving port (15), an air inlet hose (16), an air flow sensor (17), an air outlet hose (18), a nitrogen bottle (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), an air 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); The air inlet (2) and the air outlet (3) are mounted on the machine body (1); the air inlet (2) is internally connected to a nitrogen bottle (19), and the outside is connected to the starting end of a conduit via an air inlet hose (16); the air outlet (3) is internally connected to an exhaust solenoid valve (26), and the outside is connected to the ending end of the conduit via an air outlet hose (18); the bracket (6) is fixed to the machine body (1) via two fixing bolts (5); the camera (4) is mounted on the bracket (6), and the camera (4) is used for photographic identification of the conduit number below; the power switch (7) and the reset button (8) are mounted on the test bench; the valve display The device (9), the excess display screen (10) and the airtight status display screen (11) are fixed on the test bench, and the valve display (9) can display the switch and threshold information of each electrical valve; the ultrasonic transmitting port (12) and the ultrasonic receiving port (15) are fixed on the test bench, and are respectively connected to the air inlet hose (16) and the air outlet hose (18), and the transmitting module (13) and the receiving module (14) are respectively installed inside, and the ultrasonic wave is emitted by the transmitting module (13), and the ultrasonic wave signal is received by the receiving module (14), and the size of the ultrasonic wave signal analog quantity is judged, and then the excess matter situation in the conduit is judged; The control system (30) is used to control the main 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 airtightness test and excess material screening device as claimed in claim 1, characterized in that: The main electric gate valve (21), the low-pressure electric gate valve (22), and the high-pressure safety valve (27) are used to control the opening and closing of the pipeline; the low-pressure pressure reducing valve (23) and the high-pressure pressure reducing valve (28) respectively control the gas pressure of the low-pressure channel and the high-pressure channel; the low-pressure safety valve (24) and the high-pressure safety valve (27) are used to protect the low-pressure and high-pressure pipelines.

3. The aircraft hydraulic duct air tightness test and excess material screening device according to claim 1 or 2, characterized in that: The air pressure sensor (25) is used to collect the pipeline pressure value and feed it back to the airtight status display screen (11) in real time; when the catheter test is completed, the exhaust solenoid valve (26) is controlled to complete the exhaust of the pipeline.

4. The aircraft hydraulic duct air tightness test and excess material screening device according to claim 1 or 2, characterized in that: The gas filter (20) is used to filter the gas in the nitrogen bottle (19) to ensure that the output gas is free of impurities and avoid damage to the inner wall of the conduit.

5. The aircraft hydraulic conduit airtightness test and excess material screening device as claimed in claim 3, characterized in that: The gas filter (20) is used to filter the gas in the nitrogen bottle (19) to ensure that the output gas is free of impurities and avoid damage to the inner wall of the conduit.

6. The aircraft hydraulic duct air tightness test and excess material screening device as claimed in claim 1, 2 or 5, characterized in that: The airflow sensing sensor (17) is fixed at the pipe joint connected to the conduit and is used for detecting the leak position of the pipe joint.

7. The aircraft hydraulic conduit airtightness test and excess material screening device as claimed in claim 3, characterized in that: The airflow sensing sensor (17) is fixed at the pipe joint connected to the conduit and is used for detecting the leak position of the pipe joint.

8. The aircraft hydraulic conduit airtightness test and excess material screening device as claimed in claim 4, characterized in that: The airflow sensing sensor (17) is fixed at the pipe joint connected to the conduit and is used for detecting the leak position of the pipe joint.

9. The self-test method for the air tightness test and excess material screening device of an aircraft hydraulic conduit according to any one of claims 1 to 8, characterized in that: Here are the steps: Step 1: Make preparations before the test, check whether the pipe joints are connected properly, and make sure that the air inlet (2), exhaust port (3), ultrasonic transmitting port (12), and ultrasonic receiving port (15) of the test bench are clean and tidy; Step 2: 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 bench; Step 3: Catheter air tightness test; the operator turns on the power switch (7), the control system (30) is powered on and starts to execute the test procedure, the camera (4) identifies the number at the catheter mouth; the control system (30) drives the main electric gate valve (21) and the low-pressure electric gate valve (22) to open; Step 4: Maintain the pipeline pressure for 20 minutes. The air pressure sensor (25) monitors the pipeline pressure value in real time and displays it on the airtight status display screen (11). If the value of the air pressure sensor (25) is stable, it proves that the pipeline is not leaking; if the air pressure sensor (25) changes, it proves that there is a leak in the pipe joint, and the leak point is determined by the air flow sensor (17); Step 5: After the airtightness test is completed, the pipeline is deflated through the exhaust solenoid valve (26). When the pipeline is free of pressure, the air inlet hose (16) and the air outlet hose (18) are removed, and the air inlet hose (16) and the air outlet hose (18) are connected to the ultrasonic transmitting port (12) and the ultrasonic receiving port (15). By pressing the reset button (8), the system starts the waste screening test of the low-pressure conduit. The transmitting module (13) transmits ultrasonic waves into the pipeline, and the receiving module (14) feeds back the received data to the control system. The feedback data can be used to determine whether there is waste in the conduit and the volume of the waste; Step 6: After the redundant material test of the low-pressure conduit is completed, the air inlet hose (16) and the air outlet hose (18) are disassembled; the air tightness test of the next type of conduit is carried out; according to the above step 2, the next type of conduit is connected to the test bench, the reset button (8) is pressed to restart the system, and the pipe opening number is also identified through the camera (4); Step 7: Perform air tightness test and excess material screening of the high pressure conduit according to the above steps 4 and 5. After the process is completed, remove the connecting hose; Step 8: After all catheter tests are completed, turn off the power switch (7), tidy up the site, and make test records.

10. The self-inspection method for the air tightness test and excess material screening device of an aircraft hydraulic conduit according to claim 9, characterized in that: In the third step, 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 status of each electrical valve in real time.

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