Gearbox fireproof test system and method

Abstract

The invention provides a gearbox fireproof test system and method.The test system comprises a flame preparation assembly, a calibration mechanism, a test piece installation assembly and an oil supply and return assembly, the flame preparation assembly comprises a combustor, a motion adjusting mechanism and a flame preparation mechanism, and the flame preparation mechanism is used for preparing standard flames; the motion adjusting mechanism is used for adjusting the flame spraying direction of the combustor; the calibration mechanism is arranged on one side of the combustor and used for calibrating flames sprayed out of the combustor. The test piece mounting assembly is arranged on the outlet side of the combustor, the test piece mounting assembly comprises a support, a gearbox test piece is mounted on the support, and the motion adjusting mechanism is used for adjusting flame sprayed by the combustor to be sprayed to a target position of the gearbox test piece; and the oil supply and return assembly is connected with the test piece and is used for introducing experimental oil into the gearbox test piece and returning oil. Compared with an existing testing method, the gearbox fireproof testing system can improve the universality, accuracy and reliability of fireproof testing.

Description

Technical Field

[0001] This invention relates to the field of gearbox fire resistance testing technology, and specifically to a gearbox fire resistance testing system and method. Background Technology

[0002] As a crucial transmission component of aero-engines, the gearbox in the transmission system has a significant impact on the thrust, economic performance, and operational performance of the entire aero-engine.

[0003] Due to the high-speed, heavy-load operation of the accessory transmission system, frictional heat leads to high ambient temperatures within the transmission gearbox housing, which increase with the flight Mach number, even reaching over 200°C – a relatively harsh operating condition compared to lubricating oil. According to airworthiness regulations, the transmission gearbox must meet a 15-minute fire resistance requirement.

[0004] However, in order to reduce weight, the gearbox housing of the transmission system in the prior art is usually made of aluminum alloy, which has poor resistance to flame burn-through; on the other hand, the front and rear housings have different sealing types of interfaces and accessory devices connected to them, and these interfaces are also weak points in fire resistance.

[0005] It is known that existing methods for assessing the fire resistance of transmission system gearboxes have some limitations. Traditional theoretical analysis and simulation methods cannot fully simulate fire resistance performance under actual operating conditions, and their results often deviate from reality. Furthermore, transmission system gearboxes have different weak points in different locations, such as interface structures and sealing positions, and existing methods often cannot accurately assess the fire resistance of these weak points. This prevents a comprehensive understanding and improvement of the fire resistance of transmission system gearboxes, thus limiting the improvement of the safety and reliability of aero-engines.

[0006] Based on this, the inventors of this application propose a gearbox fire resistance testing system and method to solve the above-mentioned technical problems. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of poor accuracy and comprehensiveness in the existing methods for analyzing the fire resistance performance of gearboxes, and to provide a gearbox fire resistance testing system and method.

[0008] The present invention solves the above-mentioned technical problems through the following technical solution:

[0009] This invention provides a gearbox fire resistance testing system, characterized in that it includes:

[0010] A flame preparation assembly includes a burner, a motion adjustment mechanism, and a flame preparation mechanism, wherein the flame preparation mechanism is used to prepare a standard flame, and the motion adjustment mechanism is used to adjust the flame ejection direction of the burner;

[0011] A calibration mechanism is located on one side of the burner, and the calibration mechanism is used to calibrate the flame emitted by the burner;

[0012] A test specimen mounting assembly is located on the outlet side of the burner. The test specimen mounting assembly includes a bracket, and a gearbox test specimen is mounted on the bracket. The motion adjustment mechanism is used to adjust the flame ejected from the burner to the target position of the gearbox test specimen.

[0013] The oil supply and return assembly is connected to the test piece and is used to supply test oil and return oil to the gearbox test piece.

[0014] According to one embodiment of the present invention, the flame preparation mechanism includes an oil storage tank, a pressure storage tank and a gas storage tank, wherein the pressure storage tank is connected to the oil storage tank and an air compressor is connected to one side of the gas storage tank;

[0015] The oil storage tank is connected to the burner via an oil pipe, and the gas storage tank is connected to the burner via a gas pipe. The burner is used to mix the received oil mist and compressed air, and ignite and adjust the oil pressure and air pressure to form a standard flame.

[0016] According to one embodiment of the present invention, the motion adjustment mechanism includes a ground rail, a first bracket, a second bracket, and a third bracket, wherein the first bracket is slidably engaged with the ground rail;

[0017] The first bracket, the second bracket, and the third bracket are arranged perpendicularly to each other and slidably fitted together. The third bracket is provided with a rotating mechanism, and the burner is mounted on the rotating mechanism. The rotating mechanism is used to adjust the orientation of the burner outlet.

[0018] According to one embodiment of the present invention, the first support is provided with a first driving member, and the first driving member drives the first support to slide in cooperation with the ground rail;

[0019] The second bracket is provided with a second driving component, which drives the second bracket to slide in cooperation with the first bracket;

[0020] The third bracket is provided with a third driving component, which drives the third bracket to slide in cooperation with the second bracket.

[0021] According to one embodiment of the present invention, the first driving member, the second driving member and the third driving member are each a drive motor;

[0022] The first bracket, the second bracket, and the third bracket are all provided with slide rails along their length extension direction.

[0023] According to one embodiment of the present invention, the calibration mechanism includes a heat flow calibration stage and a temperature calibration stage, and the motion adjustment mechanism is used to move the burner to the heat flow calibration stage and the temperature calibration stage to calibrate the flame ejected by the burner.

[0024] According to one embodiment of the present invention, the heat flow calibration stage and the temperature calibration stage are arranged sequentially along the length extension direction of the ground rail;

[0025] The heat flow calibration platform is equipped with at least three sets of heat flow calibration copper tubes, and the temperature calibration platform is equipped with at least three sets of temperature sensors.

[0026] According to one embodiment of the present invention, the test specimen mounting assembly includes a base, and the bracket is mounted above the base;

[0027] The bracket is equipped with a motor bracket and a drive motor mounted on the motor bracket. The output end of the drive motor is connected to the gearbox test piece.

[0028] According to one embodiment of the present invention, the bracket is provided with mounting brackets at the top and bottom, and the opposite ends of the gearbox test piece are respectively rotatably connected to the mounting brackets.

[0029] According to one embodiment of the present invention, the bracket and the base are detachably connected by a threaded connector.

[0030] According to one embodiment of the present invention, the oil supply and return assembly includes an oil supply station and an oil return station. The oil supply station includes a first oil filling tank and a second oil filling tank. The first oil filling tank and the second oil filling tank are each provided with a heater and an oil filling pump. The heater is used to adjust the oil temperature of the supplied oil, and the oil filling pump is used to control the oil filling flow rate.

[0031] The gearbox test piece is connected to the first oil tank and the second oil tank via two branch pipes;

[0032] The oil return station is connected to the gearbox test piece via an oil return pipe.

[0033] According to one embodiment of the present invention, the return oil station is connected to the first oil tank and the second oil tank respectively via a refueling pipe.

[0034] This invention also provides a gearbox fire resistance testing method, implemented using the gearbox fire resistance testing system described above, the testing method comprising:

[0035] Step 1: Place the test piece mounting assembly in the test position and install the gearbox test piece;

[0036] Step 2: The burner is moved to the calibration mechanism based on the motion adjustment mechanism for flame calibration;

[0037] Step 3: After calibration, move the burner to the target position facing the gearbox test piece, and at the same time adjust the oil supply and return assembly to the working state and conduct a fire resistance test.

[0038] Step 4: After the test is completed, adjust the burner to the calibration mechanism for flame calibration; if the calibration requirements are met, the test is complete.

[0039] The positive and progressive effects of this invention are as follows:

[0040] The fire resistance testing system for gearboxes of this invention includes a flame preparation component that can prepare flames according to test requirements, a calibration mechanism that can calibrate the flame of the burner to obtain the standard flame required for the test, and a motion adjustment mechanism that can move the burner to different positions and adjust the burner's outlet angle. This allows for fire resistance tests to be performed on different positions on the gearbox test piece as needed, thereby improving the accuracy and reliability of the fire resistance performance evaluation results of the gearbox test piece. Attached Figure Description

[0041] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0042] Figure 1 This is a perspective view of the gearbox fire protection testing system of the present invention;

[0043] Figure 2 for Figure 1 A schematic diagram of the structure of the test specimen mounting assembly;

[0044] Figure 3 for Figure 1 Schematic diagram of the mating structure between the pilot specimen mounting assembly and the oil supply and return assembly;

[0045] Figure 4 for Figure 1 A schematic diagram of the calibration mechanism in the diagram;

[0046] Figure 5 for Figure 1 A schematic diagram of the coordinated structure of the flame preparation component and the motion adjustment mechanism;

[0047] Figure 6 This is a flowchart of the gearbox fire resistance test method of the present invention.

[0048] 1. Flame preparation components;

[0049] 2. Burner;

[0050] 3. Motion adjustment mechanism; 31. Ground rail; 32. First support; 33. Second support; 34. Third support; 35. Rotation mechanism; 36. First driving component; 37. Second driving component; 38. Third driving component; 39. Slide rail;

[0051] 4. Flame preparation mechanism; 41. Oil storage tank; 411. Oil pipe; 42. Pressure storage tank; 43. Gas storage tank; 431. Gas pipe; 44. Air compressor;

[0052] 5. Calibration mechanism; 51. Heat flow calibration stage; 511. Heat flow calibration copper tube; 52. Temperature calibration stage; 521. Temperature sensor;

[0053] 6. Test specimen mounting assembly; 61. Bracket; 62. Base; 63. Motor bracket; 64. Drive motor; 65. Mounting bracket;

[0054] 7. Gearbox test piece;

[0055] 8. Oil supply and return assembly; 81. Oil supply station; 82. Oil return station; 83. First oil filling tank; 84. Second oil filling tank; 85. Heater; 86. Oil filling pump; 87. Branch pipe; 88. Oil return pipe; 89. Oil filling pipe. Detailed Implementation

[0056] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0058] Please refer to Figures 1 to 5 This invention proposes a gearbox fire resistance testing system, including a flame preparation component 1, a calibration mechanism 5, a test piece mounting component 6, and an oil supply and return component 8. The flame preparation component 1 includes a burner 2, a motion adjustment mechanism 3, and a flame preparation mechanism 4. The flame preparation mechanism 4 is used to prepare a standard flame, and the motion adjustment mechanism 3 is used to adjust the flame ejection direction of the burner 2.

[0059] The calibration mechanism 5 is located on one side of the burner 2 and is used to calibrate the flame emitted by the burner 2. The test piece mounting assembly 6 is located on the outlet side of the burner 2. The test piece mounting assembly 6 includes a bracket 61, on which the gearbox test piece 7 is mounted. The motion adjustment mechanism 3 is used to adjust the flame emitted by the burner 2 to the target position of the gearbox test piece 7.

[0060] The oil supply and return assembly 8 is connected to the test piece and is used to supply test oil and return oil to the gearbox test piece 7.

[0061] The motion adjustment mechanism 3 is used to adjust the flame ejection direction of the burner 2 so as to conduct fire resistance tests on different positions of the gearbox test piece 7 as needed, thus more realistically simulating the fire resistance performance under engine operating conditions.

[0062] The calibration mechanism 5 is used to calibrate the flame ejected from the burner 2 in order to determine whether the temperature and heat flow of the ejected flame meet the test requirements.

[0063] Because traditional gearboxes have different shapes and locations of weak points in temperature, this invention can adjust the position of the burner 2 according to the motion adjustment mechanism 3. Therefore, compared with the prior art, the test is more versatile and flexible, and can adapt to gearboxes of transmission systems with different shapes and test positions.

[0064] Please refer to Figure 1 and Figure 5 The flame preparation mechanism 4 includes an oil storage tank 41, a pressure storage tank 42, and an air storage tank 43. The pressure storage tank 42 is connected to the oil storage tank 41, and an air compressor 44 is also connected to one side of the air storage tank 43. The oil storage tank 41 is connected to the burner 2 through an oil pipe 411, and the air storage tank 43 is connected to the burner 2 through an air pipe 431. The burner 2 is used to mix the received oil mist and compressed air, and ignite and adjust the oil pressure and air pressure to form a standard flame.

[0065] The air compressor 44 is used to supply compressed air to the air tank 43. During the test, the compressed air can be delivered to the burner 2 through the air pipe 431.

[0066] Meanwhile, during the test, the oil storage tank 41 supplies fuel oil to the burner 2 through the oil pipe 411, and then the burner 2 mixes the oil mist and compressed air, ignites and adjusts the oil pressure and air pressure to form a standard flame.

[0067] The motion adjustment mechanism 3 includes a ground rail 31, a first bracket 32, a second bracket 33, and a third bracket 34. The first bracket 32 ​​is slidably engaged with the ground rail 31. The first bracket 32, the second bracket 33, and the third bracket 34 are perpendicular to each other and slidably engaged. The third bracket 34 is provided with a rotating mechanism 35. The burner 2 is mounted on the rotating mechanism 35. The rotating mechanism 35 is used to adjust the orientation of the burner 2 outlet.

[0068] That is, the spatial position of the burner 2 can be adjusted by the first bracket 32, the second bracket 33 and the third bracket 34, and the rotation mechanism 35 can adjust the orientation of the burner 2 outlet. In this way, the burner 2 can spray flames to different positions of the gearbox test piece 7 to conduct fire resistance tests.

[0069] Specifically, the first support 32 is provided with a first driving member 36, which drives the first support 32 to slide in cooperation with the ground rail 31; the second support 33 is provided with a second driving member 37, which drives the second support 33 to slide in cooperation with the first support 32; the third support 34 is provided with a third driving member 38, which drives the third support 34 to slide in cooperation with the second support 33.

[0070] It can be seen that the length direction of the first support 32 can be defined as the X-axis, the length direction of the second support 33 can be defined as the Z-axis, and the length direction of the third support 34 can be defined as the Y-axis. The first support 32 is set perpendicular to the ground rail 31 and one end is slidably connected to the first support 32. Thus, the position of the burner 2 on the X-axis can be adjusted by the sliding cooperation between the first support 32 and the ground rail 31. The second support 33 is slidably connected to the first support 32 along the length direction of the first support 32, thus the position of the burner 2 on the Z-axis can be adjusted. The third support 34 is slidably connected to the second support 33 along the length direction of the second support 33, thus the position of the burner 2 on the Y-axis can be adjusted.

[0071] Specifically, the first driving component 36, the second driving component 37 and the third driving component 38 are drive motors; the first bracket 32, the second bracket 33 and the third bracket 34 are all provided with slide rails 39 along their length extension direction.

[0072] Taking the first support 32 and the ground rail 31 as an example, the ground rail 31 is provided with a track, one end of the first support 32 is slidably engaged with the track, and under the driving action of the drive motor, the first support 32 is driven to slide along the ground rail 31, thereby adjusting the position of the burner 2 on the X-axis.

[0073] Similarly, the first bracket 32 ​​is provided with a track, and the second bracket 33 is sleeved on the first bracket 32 ​​and slides in cooperation with the track. Under the action of the drive motor, the second bracket 33 can slide relative to the first bracket 32 ​​to adjust the position of the burner 2 on the Z-axis.

[0074] Furthermore, the third bracket 34 is slidably mounted on the second bracket 33 and slidably engaged with the second bracket 33, thereby adjusting the position of the burner 2 on the Y-axis under the action of the drive motor.

[0075] Therefore, under the action of the first support 32, the second support 33, the third support 34 and the ground rail 31, the position of the burner 2 on the XYZ axis in space can be adjusted, thus meeting the test requirements of different positions.

[0076] Furthermore, the third support 34 is also equipped with a rotating mechanism 35, which can adjust the spray angle of the burner 2 to ensure that the flame can fully cover all the areas of the gearbox test piece 7 that need to be tested.

[0077] Please refer to Figure 1 and Figure 4 The calibration mechanism 5 includes a heat flow calibration stage 51 and a temperature calibration stage 52. The motion adjustment mechanism 3 is used to move the burner 2 to the heat flow calibration stage 51 and the temperature calibration stage 52 to calibrate the flame ejected by the burner 2.

[0078] The heat flux and temperature of the flame can be determined by using the heat flux calibration stage 51 and the temperature calibration stage 52, thus ensuring that the flame meets the test requirements.

[0079] Specifically, the heat flow calibration stage 51 and the temperature calibration stage 52 are arranged sequentially along the length of the ground rail 31; the heat flow calibration stage 51 is provided with at least three sets of heat flow calibration copper tubes 511, and the temperature calibration stage 52 is provided with at least three sets of temperature sensors 521.

[0080] The calibration of temperature and heat flux can determine whether the flame equivalent is qualified.

[0081] Please refer to the references and Figure 2 The test piece mounting assembly 6 includes a base 62 and a bracket 61 mounted on the base 62. The bracket 61 is provided with a motor bracket 63 and a drive motor 64 mounted on the motor bracket 63. The output end of the drive motor 64 is connected to the gearbox test piece 7.

[0082] The drive motor 64 is used to drive the gearbox to run, thereby simulating the running state of the gearbox.

[0083] Optionally, the bracket 61 is provided with mounting brackets 65 at the top and bottom, and the opposite ends of the gearbox test piece 7 are rotatably connected to the mounting brackets 65 respectively.

[0084] This allows the installation orientation of the gearbox test piece 7 to be adjusted as needed.

[0085] In some other embodiments, the bracket 61 and the base 62 are detachably connected by a threaded connector.

[0086] For example, when it is necessary to test both the front and rear of the gearbox test piece 7, the front of the gearbox test piece 7 can be facing the burner 2 first for testing; after the test is completed, the installation direction of the gearbox test piece 7 can be adjusted to test the rear of the gearbox.

[0087] Alternatively, the orientation of the gearbox test piece 7 can be reversed by disassembling the bracket 61, readjusting its installation position, and then turning it around.

[0088] Alternatively, casters can be installed at the bottom of the base 62 to adjust the orientation of the base 62 according to different test positions, thereby adjusting the orientation of the gearbox test piece 7.

[0089] Please refer to Figure 1 and Figure 3 The oil supply and return assembly 8 includes an oil supply station 81 and an oil return station 82. The oil supply station 81 includes a first oil filling tank 83 and a second oil filling tank 84. Each of the first oil filling tank 83 and the second oil filling tank 84 is equipped with a heater 85 and an oil injection pump 86. The heater 85 is used to adjust the oil temperature of the supplied oil, and the oil injection pump 86 is used to control the oil injection flow rate. The gearbox test piece 7 is connected to the first oil filling tank 83 and the second oil filling tank 84 through two branch pipes 87. The oil return station 82 is connected to the gearbox test piece 7 through a return oil pipe 88.

[0090] The heater 85 can adjust the temperature of the fuel in the first fuel tank 83 and the second fuel tank 84 as needed, thus switching between different fuel temperatures during the test process.

[0091] The fuel pump 86 is equipped with two frequency converters that are set to different frequencies to control the flow and pressure. By switching the valve, different branch pipes 87 are connected to the gearbox test piece 7, thus controlling the gearbox test piece 7 to obtain fuel at different oil temperatures.

[0092] It is known that the branch pipe 87 is equipped with a flow meter, a pressure sensor, and a temperature sensor 521 to monitor the oil temperature, pressure, and flow rate, thus ensuring that the fuel used in the gearbox test piece 7 meets the test requirements.

[0093] Furthermore, the return oil station 82 is connected to the first oil tank 83 and the second oil tank 84 via the refueling pipe 89.

[0094] This allows for the recycling of fuel, saving energy.

[0095] The testing system provided by this invention also includes a control unit, which is connected in communication with various mechanisms, thereby meeting the requirements of automated testing.

[0096] To address the shortcomings of traditional methods in terms of the poor accuracy of fire resistance performance assessment, this invention can simulate the actual operating state of the gearbox test piece 7. Under the standard flame generated by the standard burner 2, it can measure parameters such as vibration, casing temperature, and heat flux density of the gearbox test piece 7, and evaluate the fire resistance performance of weak points through flame impact testing, thereby improving the accuracy and reliability of the assessment results.

[0097] To address the shortcomings of traditional methods in terms of versatility, this invention incorporates a motion adjustment mechanism 3 to adjust the three-dimensional spatial position of the burner 2, ensuring that the flame can fully cover all areas of the gearbox test piece 7 that require testing. This allows the invention to adapt to gearboxes of different shapes and testing positions, thereby improving the versatility and applicability of the test.

[0098] To address the issues of testing efficiency and reliability encountered by traditional methods, this invention relates to an automated oil supply and return control mechanism that can quickly switch between hot oil at different temperatures and pressures to meet the switching requirements between slow and wind turbine conditions in fire protection tests. Furthermore, it is equipped with a switching valve, flow meter, pressure sensor, and temperature sensor 521, which can monitor and adjust the flow rate, pressure, and temperature of the oil in real time to ensure the stable operation of the testing platform.

[0099] Please refer to Figure 6 The present invention also proposes a gearbox fire resistance test method, which is implemented using the gearbox fire resistance test system described above. The test method includes:

[0100] Step 1: Place the test piece mounting assembly in the test position and install the gearbox test piece;

[0101] Step 2: The burner is moved to the calibration mechanism based on the motion adjustment mechanism for flame calibration;

[0102] Step 3: After calibration, move the burner to the target position facing the gearbox test piece, and at the same time adjust the oil supply and return assembly to the working state and conduct a fire resistance test.

[0103] Step 4: After the test is completed, adjust the burner to the calibration mechanism for flame calibration; if the calibration requirements are met, the test is complete.

[0104] That is, according to the test requirements, the test piece mounting assembly is first placed in a suitable position, and then the burner is moved to the heat flow calibration platform and temperature calibration platform for calibration. After the flame meets the standard flame, the burner is moved to the test piece mounting assembly position, and the spatial coordinates and orientation angle of the burner are adjusted according to the test target position of the gearbox test piece.

[0105] Simultaneously, the oil supply and return stations are kept operational, and fire resistance tests are conducted. During the tests, the temperature and flow rate of the heat flux can be switched.

[0106] After the test is completed, the burner is moved to the heat flow calibration station and temperature calibration station for recalibration to verify the flame standard. If the flame standard meets the requirements, the test is complete.

[0107] Compared with traditional testing methods, this invention can more realistically simulate the fire resistance performance under engine operating conditions, improving the accuracy and reliability of the evaluation results.

[0108] Moreover, the present invention has the advantages of versatility and flexibility. The shape and weak point location of the transmission system gearbox may vary depending on different engine models, and the test system of the present invention can adapt to transmission system gearboxes of different shapes and test positions, thereby improving the versatility and applicability of the test platform.

[0109] Meanwhile, the testing platform adopts an automated control system to realize automated control and data acquisition of the testing process, reducing human error and improving the accuracy and reliability of the test.

[0110] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "joining", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can also refer to mechanical connections. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0111] This application uses specific terms to describe embodiments of the application. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0112] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A gearbox fire resistance testing system, characterized in that, include: A flame preparation assembly includes a burner, a motion adjustment mechanism, and a flame preparation mechanism, wherein the flame preparation mechanism is used to prepare a standard flame, and the motion adjustment mechanism is used to adjust the flame ejection direction of the burner; A calibration mechanism is located on one side of the burner, and the calibration mechanism is used to calibrate the flame emitted by the burner; A test specimen mounting assembly is located on the outlet side of the burner. The test specimen mounting assembly includes a bracket, and a gearbox test specimen is mounted on the bracket. The motion adjustment mechanism is used to adjust the flame ejected from the burner to the target position of the gearbox test specimen. The oil supply and return assembly is connected to the test piece and is used to supply test oil and return oil to the gearbox test piece.

2. The gearbox fire resistance testing system according to claim 1, characterized in that, The flame preparation mechanism includes an oil storage tank, a pressure storage tank, and a gas storage tank. The pressure storage tank is connected to the oil storage tank, and an air compressor is connected to one side of the gas storage tank. The oil storage tank is connected to the burner via an oil pipe, and the gas storage tank is connected to the burner via a gas pipe. The burner is used to mix the received oil mist and compressed air, and ignite and adjust the oil pressure and air pressure to form a standard flame.

3. The gearbox fire resistance testing system according to claim 1, characterized in that, The motion adjustment mechanism includes a ground rail, a first support, a second support, and a third support, wherein the first support slides in conjunction with the ground rail; The first bracket, the second bracket, and the third bracket are arranged perpendicularly to each other and slidably fitted together. The third bracket is provided with a rotating mechanism, and the burner is mounted on the rotating mechanism. The rotating mechanism is used to adjust the orientation of the burner outlet.

4. The gearbox fire resistance testing system according to claim 3, characterized in that, The first bracket is provided with a first driving component, which drives the first bracket to slide in cooperation with the ground rail; The second bracket is provided with a second driving component, which drives the second bracket to slide in cooperation with the first bracket; The third bracket is provided with a third driving component, which drives the third bracket to slide in cooperation with the second bracket.

5. The gearbox fire resistance testing system according to claim 4, characterized in that, The first driving component, the second driving component, and the third driving component are all drive motors; The first bracket, the second bracket, and the third bracket are all provided with slide rails along their length extension direction.

6. The gearbox fire resistance testing system according to claim 3, characterized in that, The calibration mechanism includes a heat flow calibration stage and a temperature calibration stage. The motion adjustment mechanism is used to move the burner to the heat flow calibration stage and the temperature calibration stage to calibrate the flame emitted by the burner.

7. The gearbox fire resistance testing system according to claim 6, characterized in that, The heat flow calibration stage and the temperature calibration stage are arranged sequentially along the length of the ground rail; The heat flow calibration platform is equipped with at least three sets of heat flow calibration copper tubes, and the temperature calibration platform is equipped with at least three sets of temperature sensors.

8. The gearbox fire resistance testing system according to claim 1, characterized in that, The test specimen mounting assembly includes a base, and the bracket is mounted on top of the base; The bracket is equipped with a motor bracket and a drive motor mounted on the motor bracket. The output end of the drive motor is connected to the gearbox test piece.

9. The gearbox fire resistance testing system according to claim 8, characterized in that, The bracket is provided with mounting brackets at the top and bottom, and the two ends of the gearbox test piece are rotatably connected to the mounting brackets respectively.

10. The gearbox fire resistance testing system according to claim 8, characterized in that, The bracket and the base are detachably connected via threaded connectors.

11. The gearbox fire resistance testing system according to claim 1, characterized in that, The oil supply and return assembly includes an oil supply station and an oil return station. The oil supply station includes a first oil tank and a second oil tank. Each of the first oil tank and the second oil tank is equipped with a heater and an oil pump. The heater is used to adjust the oil temperature of the supplied oil, and the oil pump is used to control the oil flow rate. The gearbox test piece is connected to the first oil tank and the second oil tank via two branch pipes; The oil return station is connected to the gearbox test piece via an oil return pipe.

12. The gearbox fire resistance testing system according to claim 11, characterized in that, The return oil station is connected to the first oil tank and the second oil tank via refueling pipes.

13. A method for testing the fire resistance of a gearbox, implemented using the gearbox fire resistance testing system as described in any one of claims 1-12, characterized in that, The testing method includes: Step 1: Place the test piece mounting assembly in the test position and install the gearbox test piece; Step 2: The burner is moved to the calibration mechanism based on the motion adjustment mechanism for flame calibration; Step 3: After calibration, move the burner to the target position facing the gearbox test piece, and at the same time adjust the oil supply and return assembly to the working state and conduct a fire resistance test. Step 4: After the test is completed, adjust the burner to the calibration mechanism for flame calibration; if the calibration requirements are met, the test is complete.

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