Available fuel quantity digital calibration device for aircraft fuel tank and use method of available fuel quantity digital calibration device

Abstract

The embodiment of the invention discloses an available fuel quantity digital calibration device for an aircraft fuel tank and a use method of the available fuel quantity digital calibration device. In the calibration device, the calibration device is integrally moved through a test vehicle body, and in a fuel calibration module arranged on the test vehicle body, two sets of pipeline collection assemblies 4 are both of disc body structures; an inlet oil drainage hose 3 is wound on the first pipeline collecting assembly 4a, and an outlet oil drainage hose 6 is wound on the second pipeline collecting assembly 4b in the opposite direction; one end of an inlet oil drainage hose 3 on the first pipeline collection assembly 4a is sequentially connected with an oil mass meter 13, a stop valve 8 and a second pipeline collection assembly 4b through oil pipes, the oil mass meter 13, the stop valve 8 and part of an oil drainage pipe are supported through a supporting bracket on a test vehicle body, and a fuel oil calibration pipeline arranged to be of a U-shaped structure is formed; the first pipeline collecting assembly 4a and the second pipeline collecting assembly 4b are arranged on the test platform 1 of the test vehicle body in a staggered manner; the power supply connecting module 5 is electrically connected with the oil mass meter 13; and the fuel calibration pipeline of the fuel calibration module is used for continuously and uninterruptedly metering the quantity of available fuel in the fuel tank of the aircraft.

Description

Technical Field

[0001] The present invention relates to the field of aircraft maintenance technology, but is not limited thereto, and in particular to a device for digitally calibrating the available fuel quantity of an aircraft fuel tank and a method for using the device. Background Art

[0002] Aircraft fuel tank calibration test is a necessary test procedure for new aircraft models. By measuring the amount of oil added and released from the fuel tank, the compliance of the new aircraft's fuel tank design volume is verified, the accuracy of the aircraft's fuel quantity indication system is approved, and test data is provided for designers to draw the fuel tank fuel quantity indication curve, ultimately forming design indicators for testing fuel tank manufacturing compliance.

[0003] During the fuel tank calibration test, the fuel released through the aircraft fuel supply system is the available fuel, which accounts for the vast majority of the fuel tank. The traditional fuel tank available fuel calibration test method has oil discharge weighing measurement or mechanical calibration tooling, among which the mechanical calibration tooling takes the oil discharge vehicle for oil quantity calibration test as an example. The discharge vehicle is equipped with two oil barrels of a certain volume with measuring scales. During the test, the fuel discharged from the aircraft fuel tank is collected into the oil barrels. After manual reading and measurement, the oil pump in the oil barrel is started to transfer the fuel to the ground fuel collection device. The oil discharge measurement is cyclically operated until the available fuel in the tank is completely discharged.

[0004] The above-mentioned traditional fuel tank calibration test method requires multiple cycles of cumulative measurement, that is, the overall measurement process is an intermittent calibration method, and each cycle of measurement requires standing still until the oil level is stable before reading the value. The test is intermittent and time-consuming, and the efficiency is low. Summary of the invention

[0005] Purpose of the present invention: In order to solve the above technical problems, the embodiments of the present invention provide a digital calibration device for the available fuel amount of an aircraft fuel tank and a method for using the same, so as to solve the problem that the existing test method for calibrating the available fuel amount of the fuel tank needs to be accumulated through multiple cycles, and each cycle measurement needs to be left to stand until the oil level is stable before reading the value, so the test is intermittently carried out, which is time-consuming and inefficient.

[0006] Technical solution of the present invention: In a first aspect, an embodiment of the present invention provides a digital calibration device for the available fuel quantity of an aircraft fuel tank, comprising: a test vehicle body and a fuel calibration module;

[0007] The test vehicle body is a mounting platform for the fuel calibration mechanism, and the calibration device is moved by the test vehicle body as a whole; wherein the fuel calibration module arranged on the test vehicle body comprises: an oil drain hose, two sets of pipeline collection components 4, a power connection module 5, a cut-off valve 8 and an oil quantity meter 13, and the oil drain hose comprises an inlet oil drain hose 3 and an outlet oil drain hose 6;

[0008] Each set of pipeline collection components 4 is configured as a disc structure for winding an oil drain hose, the inlet oil drain hose 3 is wound on the first pipeline collection component 4a, and the outlet oil drain hose 6 is wound on the second pipeline collection component 4b in the opposite direction; one end of the inlet oil drain hose 3 on the first pipeline collection component 4a is connected to the oil meter 13, the cut-off valve 8 and the second pipeline collection component 4b in sequence through the oil pipe, wherein the oil meter 13, the cut-off valve 8 and part of the oil drain pipe are supported by the support bracket on the test vehicle body to form a fuel calibration pipeline arranged in a "U"-shaped structure, and the first pipeline collection component 4a and the second pipeline collection component 4b are staggered and arranged on the test platform 1 of the test vehicle body; the power connection module 5 is electrically connected to the oil meter 13;

[0009] The digital calibration device for available fuel quantity is used to move the device as a whole to the bottom of the aircraft fuel tank through the test vehicle body and lock its parking position, and continuously and uninterruptedly measure the available fuel quantity in the aircraft fuel tank through the fuel calibration pipeline of the fuel calibration module.

[0010] Optionally, in the above-mentioned device for digitally calibrating the available fuel quantity of an aircraft fuel tank,

[0011] The test vehicle body comprises: a test platform 1, a traction rod 9, a roller 11, a ground lock assembly 12, a main frame 15, a support bracket 16, a support lug 17 and an electrostatic conductive module;

[0012] The main frame 15 is configured as a square frame structure, and a plurality of support brackets 16 are vertically arranged on the upper end surface of the main frame 15, for supporting the fuel meter 13, the cut-off valve 8 and part of the oil drain pipe in the fuel calibration module; the test platform 1 is placed as a whole on the upper end surface of the main frame 15, and the four rollers 11 are correspondingly mounted on the roller mounting seats 18 at the four corners of the bottom of the main frame 15; the static electricity conduction module is arranged at the rear end bottom of the main frame 15;

[0013] The front end of the main frame 15 is provided with a support ear 17, and the traction rod 9 is installed through the support ear 17, which is used to tow the movement of the entire test vehicle body through the traction rod 9;

[0014] Four ground lock assemblies 12 are installed on the inner sides of the four corners of the main frame 15, which are symmetrical in the horizontal direction and the vertical direction, and are used to lock the test vehicle body moved into place.

[0015] Optionally, in the above-mentioned digital calibration device for the available fuel quantity of an aircraft fuel tank, the fuel calibration module further comprises: 2 sets of pipeline guide assemblies 7;

[0016] The two sets of pipeline collection components 4 are respectively installed on the test platform 1 in a staggered manner through a set of mounting brackets, and the central axes of the two sets of pipeline collection components 4 are at the same vertical distance from the horizontal central axis of the test platform 1, and the disc-shaped planes of the two sets of pipeline collection components 4 are respectively parallel to the longitudinal sides of the test platform 1; the two side ears of the mounting bracket are hinged to the central axis of the pipeline collection component 4, so that the pipeline collection component 4 rotates around the central axis to pull out or retract the oil drain hose;

[0017] A set of pipeline guide assembly 7 is installed on each set of pipeline collection assembly 4, and each set of pipeline guide assembly 7 includes a guide portion with an elongated notch and connecting arms fixed on both sides of the guide portion; each set of pipeline guide assembly 7 is installed on the outside of the two side ears of the mounting bracket through its connecting arms, so that its guide portion is placed on the outside of the corresponding pipeline collection assembly 4;

[0018] The inlet end of the inlet oil drain hose 3 wound on the first pipeline collecting component 4a extends out after passing through the slot of the guide part, and is used to be connected to the oil drain interface of the aircraft fuel tank. The outlet end of the outlet oil drain hose 6 wound on the second pipeline collecting component 4b extends out after passing through the slot of the guide part, and is used to be connected to the ground oil collection equipment.

[0019] Optionally, in the above-mentioned device for digitally calibrating the available fuel quantity of an aircraft fuel tank,

[0020] A rubber protective ring for guiding and rolling the oil drain hose is sleeved on the winding disk of each set of pipeline collection components 4, which is used for limiting and protecting the oil drain hose when pulling out or recovering the oil drain hose, and the surface of the rubber protective ring is wear-resistant;

[0021] Each set of pipeline collecting components 4 is also provided with a self-locking mechanism and an automatic rewinding mechanism, which are used to lock the oil drain hose at any pulling distance through the self-locking mechanism when the oil drain hose is pulled out, and to store force on the spring in the automatic rewinding mechanism, so as to pull the oil drain hose when the force is adjusted again or switch the pipeline collecting component 4 to the hose rewinding mode. When the automatic rewinding mechanism rewinds, the pipeline collecting component 4 is driven to rotate in the opposite direction by unloading the force on the spring to achieve pipeline retraction.

[0022] Optionally, in the above-mentioned device for digitally calibrating the available fuel quantity of an aircraft fuel tank, the fuel calibration module further comprises: 2 disc adapters;

[0023] A support bracket 16 is fixedly provided at the front and rear ends of the installation position of the oil meter 13, respectively, for setting up the oil meter 13 between the two support brackets 16; the front and rear ends of the oil meter 13 are rigidly connected to the oil drain pipe through a disc adapter respectively; a display screen 14 is provided on the top of the oil meter 13, for switching the measurement unit mode of the oil meter 13 through the display screen 14.

[0024] Optionally, in the above-mentioned digital calibration device for the available fuel quantity of an aircraft fuel tank, the shut-off valve 8 is arranged at the outlet end of the fuel quantity meter 13 and is located at the position of the oil discharge pipeline at the shortest distance that satisfies the working distance of the fuel quantity meter 13;

[0025] The top of one of the supporting brackets 16 is set as a mouth frame structure, which is used to support and fix the shut-off valve 8 located in the pipeline, and the operating handle of the shut-off valve 8 extends out of the top plate of the mouth frame structure. The oil circuit of the fuel calibration module is opened or closed by steering the operating handle, thereby realizing accurate control of the metering process and metering results.

[0026] Optionally, in the above-mentioned device for digitally calibrating the available fuel quantity of an aircraft fuel tank,

[0027] The power connection module 5 is arranged at the rear end of the test platform 1 and is located between the two pipeline collection components 4; the power connection module 5 includes: a shell, a circular collector arranged in the shell, a power cord wound on the circular collector, a power on / off switch and a working indicator light arranged on the end surface of one side of the shell, and a power socket arranged on the end surface of the other side of the shell, and the power socket is electrically connected to the power supply line plug of the oil meter 13 to provide working power to the oil meter 13.

[0028] Optionally, in the above-mentioned device for digitally calibrating the available fuel quantity of an aircraft fuel tank,

[0029] The inlet end of the inlet oil drain hose 3 is provided with a hose with a fixed clamp for connecting with the aircraft fuel tank oil drain interface, and is equipped with adapters of various specifications for connecting the fuel tank oil drain interfaces of different models of aircraft; and a fixed clamp is used to connect and fix the connection interface position; the outlet end of the outlet oil drain hose 6 is provided with a plugging cap; and limited rubber balls are provided at the ports of the inlet oil drain hose 3 and the outlet oil drain hose 6;

[0030] The lengths of the inlet oil drain hose 3 and the outlet oil drain hose 6 are set to meet the distance requirements of the test connection under multiple working conditions.

[0031] In a second aspect, an embodiment of the present invention further provides a method for using a digital calibration device for the available fuel quantity of an aircraft fuel tank, wherein the remaining fuel quantity in the aircraft fuel tank is calibrated using the digital calibration device for the available fuel quantity of an aircraft fuel tank as described in any one of the above items, and the method for using includes:

[0032] The digital calibration device for available fuel quantity is moved as a whole to the parking position under the aircraft through the test vehicle body, and the parking position is locked; after the end portions of the inlet oil drain hose 3 and the outlet oil drain hose 6 are pulled out from the two sets of pipeline collection components 4, the inlet oil drain hose 3 is connected to the oil drain interface of the aircraft fuel tank, and the outlet oil drain hose 6 is connected to the ground oil collection equipment; the power connection module 5 is connected to the oil quantity meter 13; after the aircraft fuel tank is drained, the shut-off valve 8 is opened to connect the oil circuit, and the initial value and the end value are recorded through the oil metering device 13; after the test is completed, the shut-off valve 8 is closed to close the oil circuit; and the digital calibration device for available fuel quantity is removed.

[0033] Optionally, in the method for using the above-mentioned device for digitally calibrating the available fuel quantity of an aircraft fuel tank, the method specifically comprises the following steps:

[0034] Step 1: The available fuel quantity digital calibration device is moved as a whole to the lower part of the aircraft by towing the towing rod 9, the parking position of the device is adjusted by operating the towing rod 9, and the parking position of the calibration device is locked by the ground lock assembly 12, and the static electricity conduction module is reliably grounded;

[0035] Step 2: Pull out the inlet oil drain hose 3 and the outlet oil drain hose 6 from the two sets of pipeline collection components 4, remove the plug cap, connect the inlet oil drain hose 3 to the oil drain interface of the aircraft fuel tank, connect the outlet oil drain hose 6 to the ground oil collection equipment, and fix them;

[0036] Step 3, by selecting the circular collector in the power connection module 5, releasing a certain length of power cord, connecting the power cord plug to the 220V ground power socket; and connecting the power supply cable plug of the oil meter 13 to the power socket of the power connection module 5;

[0037] Step 4, turn on the power on / off switch, the red light of the working indicator light up, wait for the oil meter 13 to preheat, press the switch button on the display screen 14 to select the measurement unit mode according to the measurement requirements;

[0038] Step 5, drain the aircraft fuel tank according to the fuel supply steps of the aircraft fuel system, rotate the cut-off valve 8 90° counterclockwise to connect the oil circuit, observe the data changes on the display screen 14 of the fuel metering device 13, and record the initial value and the end value;

[0039] Step 6: After the test, rotate the cut-off valve 8 90° clockwise to close the oil circuit; turn off the power on / off switch, disconnect the connecting pipeline of the fuel calibration module, and collect the oil drain pipeline, power cord, and static electricity conduction module;

[0040] Step 7, loosen the four ground lock assemblies 12 on the test vehicle body and remove the digital calibration device for the available fuel quantity.

[0041] The beneficial effects of the present invention are as follows: in order to solve the existing test method for calibrating the available fuel in the fuel tank, because it is necessary to perform cumulative measurement through multiple cycles, and each cycle measurement needs to be left to stand for the oil level to stabilize before reading the value, the test is intermittently carried out, and the problems of long time and low efficiency; and in order to eliminate the safety hazards of the external power supply of the oil pump. The embodiment of the present invention provides a digital calibration device for the available fuel amount of an aircraft fuel tank and a method for using the same. The digital calibration device for the available fuel amount replaces the previous method of inconvenient tooling transportation, the need to perform multiple cycles of cumulative measurement, and intermittent calibration. It can realize the digital measurement calibration of the fuel amount synchronously in combination with the aircraft fuel discharge work, and the test is carried out continuously; in the calibration work, it is only necessary to read the flow start value and the end indication value, and the difference between the two is the test calibration result value, reducing the manual multiple data accumulation records and the conversion of values ​​between different units. The calibration device provided by the embodiment of the present invention can be used to conveniently, efficiently, and accurately calibrate the available fuel amount of the aircraft fuel tank; the calibration device has the advantages of strong practicality, simple operation method, and strong expansibility. In addition, adapter joints of various specifications are used to connect the oil inlet pipeline end of the calibration device to the oil discharge interface of different aircraft, which can be used for field fuel calibration ground test of various aircraft; the fuel calibration module is installed to form a "U"-shaped fuel calibration pipeline with high space utilization and good structural stability; lightweight oil discharge hoses, automatic pipeline collection components and other components are used to make the overall device light, mobile and flexible, improve on-site working conditions, reduce manpower intensity, improve work efficiency and test accuracy, and has great practical application significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0043] Figure 1 A schematic diagram of the overall structure of a digital calibration device for the available fuel quantity of an aircraft fuel tank provided by an embodiment of the present invention;

[0044] Figure 2 for Figure 1 The figure shows a schematic diagram of the component structure of a test vehicle body in a device for digitally calibrating the available fuel quantity of an aircraft fuel tank provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0046] The above background technology has already explained the importance of aircraft fuel tank calibration test in the test of new aircraft models. The traditional fuel tank available fuel calibration test method has the following problems:

[0047] 1) The traditional calibration test method requires intermittent calibration through multiple cycles of cumulative measurement, and each cycle measurement requires standing still until the oil level is stable before reading the value. The test is intermittent and time-consuming, and the efficiency is low;

[0048] 2) After the test, the test result values ​​need to be converted manually multiple times, such as converting the recorded fuel volume value into a mass value, which delays the calibration time and the workload of the staff;

[0049] 3) Due to factors such as the large amount of residual oil remaining in the oil drain line during the test, it is not conducive to the accuracy control of the test results;

[0050] 4) The oil pump in the test tooling needs to be powered by an external power supply, which increases the risk of the test; and the tooling itself is very heavy and requires the joint efforts of multiple people to move, which is inconvenient to use.

[0051] With the advancement of aviation manufacturing technology, the traditional fuel tank calibration test method can no longer meet the development needs of high-efficiency and high-quality aircraft manufacturing. In order to ensure the accuracy of fuel tank calibration tests and improve test efficiency, it is urgently necessary to develop digital-based fuel tank calibration test technology and explore new process methods for fuel tank calibration.

[0052] In view of the above problems and the urgent need for fuel tank calibration tests, an embodiment of the present invention provides a digital calibration device for the available fuel amount of an aircraft fuel tank and a method for using the same, which replaces the manual methods of "difficulty in moving tooling", "recording test data and conversion of test values ​​in different units", and "cyclic intermittent calibration" in the prior art, eliminates the safety hazards of the oil pump operating with an external power supply, and realizes the transformation of fuel tank calibration technology from manual mechanical cyclic calibration to digital measurement calibration.

[0053] The present invention provides the following specific embodiments which can be combined with each other. The same or similar concepts or processes may not be described in detail in some embodiments.

[0054] Figure 1 The overall structure diagram of a digital calibration device for the available fuel quantity of an aircraft fuel tank provided by an embodiment of the present invention is shown in FIG. Figure 2 for Figure 1 The main structure of the digital calibration device for the available fuel amount of an aircraft fuel tank provided by the embodiment of the present invention includes: a test vehicle body and a fuel calibration module.

[0055] like Figure 1 and Figure 2 In the structure of the digital calibration device for available fuel quantity shown, the test vehicle body is the installation platform of the fuel calibration mechanism, and the device is calibrated as a whole through the test vehicle body; wherein, the fuel calibration module arranged on the test vehicle body includes: an oil drain hose, two sets of pipeline collection components 4, a power connection module 5, a cut-off valve 8 and an oil quantity meter 13, and the oil drain hose includes an inlet oil drain hose 3 and an outlet oil drain hose 6. The oil drain hose in the embodiment of the present invention is a soft pipeline that is lightweight, antistatic, and can be conveniently stored and used through the pipeline collection component 4.

[0056] In the embodiment of the present invention, each set of pipeline collecting components 4 is configured as a disc structure for winding an oil drain hose, the inlet oil drain hose 3 is wound on the first pipeline collecting component 4a, and the outlet oil drain hose 6 is wound on the second pipeline collecting component 4b in the opposite direction; one end of the inlet oil drain hose 3 on the first pipeline collecting component 4a is connected to the oil meter 13, the cut-off valve 8 and the second pipeline collecting component 4b in sequence through the oil pipe, wherein the oil meter 13, the cut-off valve 8 and part of the oil drain pipeline are supported by a supporting bracket on the test vehicle body to form a fuel calibration pipeline arranged in a "U" shape structure, and the first pipeline collecting component 4a and the second pipeline collecting component 4b are staggered and arranged on the test platform 1 of the test vehicle body; the power connection module 5 is electrically connected to the oil meter 13.

[0057] It should be noted that in the embodiment of the present invention, the fuel calibration pipeline of the "U"-shaped structure formed by the main structure in the fuel calibration module is a "U"-shaped structure formed by the fuel calibration pipeline in the form of a drain hose, a fuel meter 13 and a cut-off valve 8 connected by a hard drain pipe; the two ends of the "U"-shaped structure are symmetrically staggered and arranged on the test vehicle body after being wound around the inlet and outlet drain hoses by two sets of pipeline collection components 4, and the drain hoses on the two sets of pipeline collection components 4 are wound in the opposite direction. The arrangement of the fuel calibration pipeline in the embodiment of the present invention has the advantages of small space occupation, high stability, and easy on-site arrangement and use. The scientific and reasonable spatial layout enables the digital calibration device for the available fuel volume to have the advantages of both light structure and stability.

[0058] The fuel calibration module in the embodiment of the present invention is used to move the entire device to the bottom of the aircraft fuel tank through the test vehicle body and lock its parking position, and continuously and uninterruptedly measure the available fuel amount in the aircraft fuel tank through the fuel calibration pipeline of the fuel calibration module.

[0059] In one implementation of the embodiment of the present invention, referring to Figure 1 and Figure 2 The test vehicle body shown includes: a test platform 1, a traction rod 9, a roller 11, a ground lock assembly 12, a main frame 15, a support bracket 16, a support ear 17 and an anti-static module.

[0060] In this implementation, the main frame 15 is set as a square frame structure, and multiple support brackets 16 are vertically arranged on the upper end surface of the main frame 15, which are used to support the oil meter 13, the cut-off valve 8 and part of the oil drain pipe in the fuel calibration module. For example, 4 support brackets 16 are provided in the figure, of which 2 support brackets 16 are used to support the oil meter 13, 1 support bracket 16 is used to support the cut-off valve 8, and 1 support bracket 16 is used to support the oil drain pipe position at the bottom end of the U-shaped area of ​​the fuel calibration pipeline.

[0061] In this implementation, the test platform 1 is, for example, a square steel plate, which matches the end face shape and size of the main frame 15, and the test platform 1 is placed as a whole on the upper end face of the main frame 15; in the specific implementation, a through hole is reserved at a preset position of the test platform 1, which is used to avoid the support bracket 16 during installation. The four rollers 11 are correspondingly mounted on the roller mounting seats 18 at the four corners of the bottom of the main frame 15; in the preferred embodiment, among the four rollers 11, two universal wheels are mounted on the front end of the main frame 15, and two ordinary rollers are mounted on the rear end of the main frame 15. In addition, the static conductive module is arranged at the rear end bottom of the main frame 15 to ensure the reliable grounding of the overall calibration device during the test.

[0062] like Figure 2 As shown, the front end of the main frame 15 is provided with a lug 17, and a traction rod 9 is installed through the lug 17, which is used to tow the movement of the entire test vehicle body through the traction rod 9. In addition, four ground lock assemblies 12 are installed on the inner side of the four corners of the main frame 15, which are symmetrical in the horizontal and vertical directions, and are used to lock the test vehicle body moved into place, that is, through the cooperation of the traction rod 9 and the four ground lock assemblies 12, the towing movement and parking fixation of the entire calibration device can be realized.

[0063] In one implementation of the embodiment of the present invention, the fuel calibration module further includes two sets of pipeline guide components 7. Figure 1 As shown, two sets of pipeline collecting assemblies 4 are respectively installed on the test platform 1 in a staggered manner through a set of mounting brackets, and the central axes of the two sets of pipeline collecting assemblies 4 are at the same vertical distance from the horizontal central axis of the test platform 1, and the disc-shaped planes of the two sets of pipeline collecting assemblies 4 are respectively parallel to the longitudinal sides of the test platform 1; and the two side ears of the mounting bracket are hinged to the central axis of the pipeline collecting assembly 4, so that the pipeline collecting assembly 4 rotates around its central axis to pull out or retract the oil drain hose.

[0064] In this implementation, one set of pipeline guide assembly 7 is installed on each set of pipeline collection assembly 4, and each set of pipeline guide assembly 7 includes a guide portion with an elongated slot and connecting arms fixed on both sides of the guide portion; each set of pipeline guide assembly 7 is installed on the outside of the two side ears of the mounting bracket through its connecting arms, so that its guide portion is placed on the outside of the corresponding pipeline collection assembly 4.

[0065] The connection form of the oil drain hose in the embodiment of the present invention is that the inlet end of the inlet oil drain hose 3 wound on the first pipeline collection component 4a passes through the notch of the guide part and then extends out, and is used to be connected to the oil drain interface of the aircraft fuel tank, and the rear end of the inlet oil drain hose 3 is connected to the oil meter 13 through the oil drain hard pipe at its rear end; the outlet end of the outlet oil drain hose 6 wound on the second pipeline collection component 4b passes through the notch of the guide part and then extends out, and is used to be connected to the ground oil collection equipment, and the front end of the outlet oil drain hose 6 is connected to the cut-off valve 8 through the oil drain hard pipe.

[0066] In one implementation of the embodiment of the present invention, a rubber protective ring for guiding and rolling the oil drain hose is provided on the winding disk of each set of pipeline collection components 4, which is used to limit and protect the oil drain hose when pulling out or recovering the oil drain hose, and the surface of the rubber protective ring is wear-resistant.

[0067] Each set of pipeline collecting components 4 is also provided with a self-locking mechanism and an automatic rewinding mechanism, which are used to lock the oil drain hose at any pulling distance through the self-locking mechanism when the oil drain hose is pulled out, and to generate force storage for the spring in the automatic rewinding mechanism, so as to pull the oil drain hose when the force is adjusted again (when increasing the force or unloading the force) or switch the pipeline collecting component 4 to the hose rewinding mode. When the automatic rewinding mechanism rewinds, the pipeline collecting component 4 is driven to rotate in the opposite direction by unloading the force on the spring to achieve pipeline retraction.

[0068] In one implementation of the embodiment of the present invention, Figure 2 As shown, the fuel calibration module also includes: 2 disc adapters.

[0069] In this implementation, a support bracket 16 is fixedly provided at the front and rear ends of the installation position of the oil meter 13, respectively, for mounting the oil meter 13 between the two support brackets 16; the front and rear ends of the oil meter 13 are rigidly connected to the oil drain pipe through a disc adapter. In addition, a display screen 14 is provided on the top of the oil meter 13, for switching the measurement unit mode of the oil meter 13 through the display screen 14, so as to facilitate the observation of the value.

[0070] In the specific implementation, a switch button is provided on the display screen 14. By pressing the switch button to set different measurement unit modes, the real-time flow rate and the accumulated flow rate value can be intuitively read through the display screen 14, thereby carrying out digital oil quantity calibration. By using the oil quantity meter 13 in the embodiment of the present invention, the calibration device can measure the amount of fuel passing through its fuel calibration pipeline in real time and record and display the value; the measurement calibration test can be carried out continuously, and the test calibration result can be obtained by reading the start and end indication values ​​of the flow rate through the difference between the two.

[0071] In one implementation of the embodiment of the present invention, Figure 2As shown, the cut-off valve 8 is arranged at the outlet end of the oil meter 13 and is located at the oil discharge pipeline position that meets the shortest distance for the oil meter 13 to work.

[0072] In this implementation, the top of a supporting bracket 16 is set as a mouth frame structure, which is used to support and fix the shut-off valve 8 located in the pipeline, and the operating handle of the shut-off valve 8 extends out of the top plate of the mouth frame structure. The oil circuit of the fuel calibration module is opened or closed by steering the operating handle, thereby achieving accurate control of the metering process and metering results.

[0073] In specific implementation, the oil circuit is opened or closed by turning the operating handle 90 degrees, thereby achieving accurate control of the metering process and results.

[0074] In one implementation of the embodiment of the present invention, Figure 2 As shown, the power connection module 5 is arranged at the rear end of the test platform 1 and is located between the two pipeline collection components 4. The power connection module 5 in this implementation may include: a shell, a circular collector arranged in the shell, a power cord wound on the circular collector, a power on / off switch arranged on one end face of the shell, and a working indicator light, and a power socket arranged on the other end face of the shell, and the power socket is electrically connected to the power supply line plug of the oil meter 13 to provide the working power supply of the oil meter 13. The power connection module 5 of this structural form can collect a certain length of ground power cord by manually rotating the circular collector.

[0075] It should be noted that, in the embodiment of the present invention, the inlet end of the inlet oil discharge hose 3 is provided with a hose with a fixed clamp for connecting with the aircraft fuel tank oil discharge interface, and is equipped with adapters of various specifications for connecting the fuel tank oil discharge interfaces of different models of aircraft; and a fixed clamp is used to connect and fix the connection interface position; the outlet end of the outlet oil discharge hose 6 is provided with a plugging cap; and the ports of the inlet oil discharge hose 3 and the outlet oil discharge hose 6 are provided with limited rubber balls to ensure the reserved length when the pipeline is recovered. By setting the adapter, the expanded application of the calibration device provided in the embodiment of the present invention can be achieved.

[0076] In addition, the length setting requirements of the inlet oil drain hose 3 and the outlet oil drain hose 6 are required to meet the distance requirements of the test connection under multiple working conditions.

[0077] When using the digital calibration device for the available fuel quantity provided by the embodiment of the present invention, the device is moved and towed to the test site, the parking position is adjusted and locked, and the device is grounded, the inlet and outlet oil discharge hoses are connected and arranged, the ground power is turned on, the oil quantity meter 13 is started and the metering mode is switched, and the aircraft fuel tank is operated to discharge the oil, and the digital calibration of the oil quantity can be carried out simultaneously.

[0078] In order to solve the existing test method for calibrating the available fuel in the fuel tank, the test is intermittent and time-consuming, and the efficiency is low because the test needs to be read after multiple cycles of cumulative measurement, and each cycle measurement needs to be left to stand for the oil level to stabilize. The safety hazard of the external power supply of the oil pump is eliminated. The embodiment of the present invention provides a digital calibration device for the available fuel amount of an aircraft fuel tank and its use method. The digital calibration device for the available fuel amount replaces the previous method of inconvenient tooling and transportation, which requires multiple cycles of cumulative measurement and intermittent calibration. It can realize the digital measurement calibration of the fuel amount in combination with the aircraft fuel discharge work, and the test is carried out continuously. In the calibration work, it is only necessary to read the flow start value and the end indication value, and the difference between the two is the test calibration result value, which reduces the manual multiple data accumulation records and the conversion of values ​​between different units. The calibration device provided by the embodiment of the present invention can be used to conveniently, efficiently and accurately calibrate the available fuel amount of the aircraft fuel tank; the calibration device has the advantages of strong practicality, simple operation method, and strong expansibility. In addition, adapter joints of various specifications are used to connect the oil inlet pipeline end of the calibration device to the oil discharge interface of different aircraft, which can be used for field fuel calibration ground test of various aircraft; the fuel calibration module is installed to form a "U"-shaped fuel calibration pipeline with high space utilization and good structural stability; lightweight oil discharge hoses, automatic pipeline collection components and other components are used to make the overall device light, mobile and flexible, improve on-site working conditions, reduce manpower intensity, improve work efficiency and test accuracy, and has great practical application significance.

[0079] Based on the digital calibration device for the available fuel quantity of an aircraft fuel tank provided by the above embodiments of the present invention, the embodiments of the present invention also provide a method for using the digital calibration device for the available fuel quantity of an aircraft fuel tank. The digital calibration device for the available fuel quantity of an aircraft fuel tank provided by any of the above embodiments can be used to perform a calibration test on the available fuel quantity of the aircraft fuel tank. The implementation process of the method includes:

[0080] The digital calibration device for available fuel quantity is moved as a whole to the parking position under the aircraft through the test vehicle body, and the parking position is locked; after the end parts of the inlet oil drain hose 3 and the outlet oil drain hose 6 are pulled out from the two sets of pipeline collection components 4, the inlet oil drain hose 3 is connected to the oil drain interface of the aircraft fuel tank, and the outlet oil drain hose 6 is connected to the ground oil collection equipment; the power connection module 5 is connected to the oil quantity meter 13; after the aircraft fuel tank is drained, the shut-off valve 8 is opened to connect the oil circuit, and the initial value and the end value are recorded through the oil quantity meter 13; after the test is completed, the shut-off valve 8 is closed to close the oil circuit; and the digital calibration device for available fuel quantity is removed.

[0081] In a specific implementation of the embodiment of the present invention, the process of using the available fuel quantity digital calibration device to perform a fuel calibration test specifically includes the following steps.

[0082] Step 1: The available fuel quantity digital calibration device is moved as a whole to the lower part of the aircraft by towing the towing rod 9, the parking position of the device is adjusted by operating the towing rod 9, and the parking position of the calibration device is locked by the ground lock assembly 12, and the static electricity conduction module is reliably grounded;

[0083] Step 2, pull out the inlet oil drain hose 3 and the outlet oil drain hose 6 from the two sets of pipeline collection components 4, connect the inlet oil drain hose 3 to the oil drain interface of the aircraft fuel tank, connect the outlet oil drain hose 6 to the ground oil collection equipment, and fix them;

[0084] Step 3, by selecting the circular collector in the power connection module 5, releasing a certain length of power cord, connecting the power cord plug to the 220V ground power socket; and connecting the power supply cable plug of the oil meter 13 to the power socket of the power connection module 5;

[0085] Step 4, turn on the power on / off switch, the red light of the working indicator light up, wait for the oil meter 13 to preheat, press the switch button on the display screen 14 to select the measurement unit mode according to the measurement requirements;

[0086] Step 5, drain the aircraft fuel tank according to the fuel supply steps of the aircraft fuel system, rotate the cut-off valve 8 90° counterclockwise to connect the oil circuit, observe the data changes on the display screen 14 of the fuel metering device 13, and record the initial value and the end value;

[0087] Step 6: After the test, rotate the cut-off valve 8 90° clockwise to close the oil circuit; turn off the power on / off switch, disconnect the connecting pipeline of the fuel calibration module, and collect the oil drain pipeline, power cord, and static electricity conduction module;

[0088] Step 7, loosen the four ground lock assemblies 12 on the test vehicle body and remove the digital calibration device for the available fuel quantity.

[0089] Although the embodiments disclosed in the present invention are as above, the contents are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A digital calibration device for the available fuel quantity of an aircraft fuel tank, characterized in that: include: Test vehicle body and fuel calibration module; The test vehicle body is a mounting platform for the fuel calibration mechanism, and the calibration device is moved through the test vehicle body as a whole; wherein the fuel calibration module arranged on the test vehicle body comprises: an oil drain hose, two sets of pipeline collection components (4), a power connection module (5), a cut-off valve (8) and an oil quantity meter (13), and the oil drain hose comprises an inlet oil drain hose (3) and an outlet oil drain hose (6); Each set of pipeline collection components (4) is configured as a disc structure for winding an oil drain hose, the inlet oil drain hose (3) is wound on the first pipeline collection component (4a), and the outlet oil drain hose (6) is wound on the second pipeline collection component (4b) in the opposite direction; one end of the inlet oil drain hose (3) on the first pipeline collection component (4a) is connected to the oil meter (13), the cut-off valve (8) and the second pipeline collection component (4b) in sequence through an oil pipe, wherein the oil meter (13), the cut-off valve (8) and part of the oil drain pipe are supported by a support bracket on the test vehicle body to form a fuel calibration pipeline arranged in a "U"-shaped structure, and the first pipeline collection component (4a) and the second pipeline collection component (4b) are staggeredly arranged on the test platform (1) of the test vehicle body; the power connection module (5) is electrically connected to the oil meter (13); The digital calibration device for available fuel quantity is used to move the device as a whole to the bottom of the aircraft fuel tank through the test vehicle body and lock its parking position, and continuously and uninterruptedly measure the available fuel quantity in the aircraft fuel tank through the fuel calibration pipeline of the fuel calibration module.

2. The digital calibration device for the available fuel quantity of an aircraft fuel tank according to claim 1, characterized in that: The test vehicle body comprises: a test platform (1), a traction rod (9), a roller (11), a ground lock assembly (12), a main frame (15), a support bracket (16), a support lug (17) and a static electricity conductive module; The main frame (15) is configured as a square frame structure, and a plurality of support brackets (16) are vertically arranged on the upper end surface of the main frame (15) for supporting the fuel meter (13), the cut-off valve (8) and part of the fuel drain pipe in the fuel calibration module; the test platform (1) is placed as a whole on the upper end surface of the main frame (15), and the four rollers (11) are correspondingly mounted on the roller mounting seats (18) at the four corners of the bottom of the main frame (15); the static electricity conduction module is arranged at the rear end bottom of the main frame (15); The front end of the main frame (15) is provided with a support ear (17), and a traction rod (9) is installed through the support ear (17) for traction of the entire test vehicle body through the traction rod (9); Four ground lock assemblies (12) are installed on the inner sides of the four corners of the main frame (15) and are symmetrical in the transverse direction and the longitudinal direction, respectively, for locking the test vehicle body that has been moved into position.

3. The digital calibration device for the available fuel quantity of an aircraft fuel tank according to claim 1, characterized in that: The fuel calibration module further comprises: 2 sets of pipeline guide components (7); The two sets of pipeline collection assemblies (4) are respectively mounted on the test platform (1) in a staggered manner through a set of mounting brackets, and the vertical distances between the central axes of the two sets of pipeline collection assemblies (4) and the transverse central axis of the test platform (1) are the same, and the disc-shaped planes of the two sets of pipeline collection assemblies (4) are respectively parallel to the longitudinal sides of the test platform (1); the two side ears of the mounting bracket are hinged to the central axis of the pipeline collection assembly (4), so that the pipeline collection assembly (4) rotates around the central axis to pull out or retract the oil drain hose; A set of pipeline guide assemblies (7) is installed on each set of pipeline collection assemblies (4), and each set of pipeline guide assemblies (7) comprises a guide portion having an elongated notch and connecting arms fixed on both sides of the guide portion; each set of pipeline guide assemblies (7) is installed on the outside of the bracket ears on both sides of the mounting bracket through its connecting arms, so that its guide portion is placed on the outside of the corresponding pipeline collection assembly (4); The inlet end of the inlet oil drain hose (3) wound on the first pipeline collection component (4a) passes through the notch of the guide part and then extends out, and is used to be connected to the oil drain interface of the aircraft fuel tank. The outlet end of the outlet oil drain hose (6) wound on the second pipeline collection component (4b) passes through the notch of the guide part and then extends out, and is used to be connected to the ground oil collection equipment.

4. The digital calibration device for the available fuel quantity of an aircraft fuel tank according to claim 3 is characterized in that: A rubber protective ring for guiding and rolling the oil drain hose is sleeved on the winding disk of each set of pipeline collection components (4), and is used for limiting and protecting the oil drain hose when it is pulled out or recovered, and the surface of the rubber protective ring is wear-resistant; Each set of pipeline collection components (4) is also provided with a self-locking mechanism and an automatic rewinding mechanism, which are used to lock the oil drain hose at any pull-out distance through the self-locking mechanism when the oil drain hose is pulled out, and to generate accumulated force for the spring in the automatic rewinding mechanism, so as to pull the oil drain hose when the force is adjusted again or switch the pipeline collection component (4) to a hose rewinding mode, and to drive the pipeline collection component (4) to rotate in the opposite direction by unloading the force on the spring when the automatic rewinding mechanism is rewound, so as to achieve pipeline retraction.

5. The digital calibration device for the available fuel quantity of an aircraft fuel tank according to any one of claims 2 to 4, characterized in that: The fuel calibration module also includes: 2 disc adapters; A support bracket (16) is fixedly provided at the front and rear ends of the installation position of the oil meter (13), respectively, for mounting the oil meter (13) between the two support brackets (16); the front and rear ends of the oil meter (13) are rigidly connected to the oil drain pipe via a disc adapter; a display screen (14) is provided on the top of the oil meter (13), for switching the measurement unit mode of the oil meter (13) via the display screen (14).

6. The digital calibration device for the available fuel quantity of an aircraft fuel tank according to any one of claims 2 to 4, characterized in that: The cut-off valve (8) is arranged at the outlet end of the oil meter (13) and is located at the oil discharge pipeline position at the shortest distance that satisfies the operation of the oil meter (13); The top of one of the support brackets (16) is provided as a mouth frame structure for supporting and fixing a shut-off valve (8) located in a pipeline, and an operating handle of the shut-off valve (8) extends out of a top plate of the mouth frame structure. By turning the operating handle, the oil circuit of the fuel calibration module is opened or closed, thereby achieving accurate control of the metering process and metering results.

7. The digital calibration device for the available fuel quantity of an aircraft fuel tank according to any one of claims 2 to 4, characterized in that: The power connection module (5) is arranged at the rear end of the test platform (1) and is located between the two pipeline collection assemblies (4); the power connection module (5) comprises: a shell, a circular collector arranged in the shell, a power cord wound around the circular collector, a power on / off switch and a working indicator light arranged on an end surface of one side of the shell, and a power socket arranged on an end surface of the other side of the shell, the power socket being electrically connected to a power supply line plug of an oil meter (13) to provide working power to the oil meter (13).

8. The digital calibration device for the available fuel quantity of an aircraft fuel tank according to any one of claims 1 to 4, characterized in that: The inlet end of the inlet oil discharge hose (3) is provided with a hose with a fixed clamp for connecting to the oil discharge interface of the aircraft fuel tank, and is provided with adapter joints of various specifications for connecting the oil discharge interfaces of the fuel tanks of aircraft of different models; and the fixed clamp is used to connect and fix the connection interface; the outlet end of the outlet oil discharge hose (6) is provided with a plugging cap; and limit rubber balls are provided at the ports of the inlet oil discharge hose (3) and the outlet oil discharge hose (6); The lengths of the inlet oil drain hose (3) and the outlet oil drain hose (6) are set to meet the distance requirements of test connections under multiple working conditions.

9. A method for using a digital calibration device for the available fuel quantity of an aircraft fuel tank, characterized in that: The remaining fuel amount in the aircraft fuel tank is calibrated using the digital calibration device for the available fuel amount of the aircraft fuel tank according to any one of claims 1 to 8, and the method of using the device includes: The available fuel quantity digital calibration device is moved as a whole to a parking position at the bottom of the aircraft through the test vehicle body, and the parking position is locked; after the end portions of the inlet oil discharge hose (3) and the outlet oil discharge hose (6) are pulled out from the two sets of pipeline collection components (4), the inlet oil discharge hose (3) is connected to the oil discharge interface of the aircraft fuel tank, and the outlet oil discharge hose (6) is connected to the ground oil collection equipment; the power connection module (5) is connected to the oil quantity meter (13); after the aircraft fuel tank is drained, the cut-off valve (8) is opened to connect the oil circuit, and the initial value and the end value are recorded through the oil metering device 13; after the test is completed, the cut-off valve (8) is closed to close the oil circuit; and the available fuel quantity digital calibration device is removed.

10. The method for using the digital calibration device for the available fuel quantity of an aircraft fuel tank according to claim 9, characterized in that: The method of use specifically comprises the following steps: Step 1, the available fuel quantity digital calibration device is moved as a whole to the lower part of the aircraft by towing the towing rod (9), the parking position of the device is adjusted by operating the towing rod (9), and the parking position of the calibration device is locked by the ground lock assembly (12), and the static electricity conduction module is reliably grounded; Step 2, pull out the inlet oil drain hose (3) and the outlet oil drain hose (6) from the two sets of pipeline collection components (4), remove the plug cap, connect the inlet oil drain hose (3) to the oil drain interface of the aircraft fuel tank, connect the outlet oil drain hose (6) to the ground oil collection equipment, and fix them; Step 3, by selecting the circular collector in the power connection module (5), releasing a certain length of power cord, connecting the power cord plug to the 220V ground power socket; and connecting the power supply cable plug of the oil meter (13) to the power socket of the power connection module (5); Step 4, turn on the power on / off switch, the red light of the working indicator light up, wait for the oil quantity meter (13) to preheat, and press the switch button on the display screen (14) to select the measurement unit mode according to the measurement requirements; Step 5, drain the aircraft fuel tank according to the fuel supply steps of the aircraft fuel system, rotate the cut-off valve (8) counterclockwise 90 degrees to connect the oil circuit, observe the data changes on the display screen (14) of the fuel metering device 13, and record the initial value and the end value; Step 6: After the test is completed, rotate the shut-off valve (8) 90° clockwise to close the oil circuit; turn off the power on / off switch, disconnect the connecting pipeline of the fuel calibration module, and collect the oil drain pipeline, power cord, and static electricity conduction module; Step 7, loosen the four ground lock assemblies (12) on the test vehicle body and remove the digital calibration device for the available fuel quantity.

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