Tilting duct testing device

Abstract

The invention belongs to the technical field of hovercars, and particularly relates to a tilting duct testing device which comprises a mechanical main support, a tilting mechanism and a sensing system. The tilting duct testing device can accurately measure the precision of a tilting mechanism, the tilting angle of the duct, the angular velocity, the thrust, the torque and other data under the condition of simulating the use scene of a real duct, and evaluate the tilting characteristics of the tilting duct. Forces in three directions are collected through the three-dimensional force sensor, data calibration is carried out in advance before testing, thrust calculation is carried out in combination with the actual angle measured by the angle encoder, and ducted thrust testing at different tilting angles is achieved. And more accurate thrust measurement can be realized. Meanwhile, the tilting precision can be obtained by comparing parameters fed back by the angle encoder with actual control angle data.

Description

Technical Field

[0001] The present invention belongs to the technical field of flying cars, and in particular relates to a tilting duct testing device. Background Art

[0002] Ducted fan aircraft and flying cars are representatives of low-altitude aircraft. The ducted fan propulsion devices in their core power systems are currently entering a period of rapid development. Ducted fans significantly improve aerodynamic efficiency and safety by wrapping the blades with annular ducts. Ducted confinement reduces energy loss, providing high-density thrust during vertical takeoff and landing and transition flight, and adapting to complex flight modes. Physical protection reduces the risk of blade collisions, and ducted guidance enhances stability while suppressing noise to meet the requirements of urban low-altitude operations. Compact system integration and lightweight design optimize spatial layout, and multi-fan collaborative control enhances redundancy and reliability. Currently, ducted fans, with their high energy efficiency, low noise, and strong environmental adaptability, have become one of the key technologies driving the commercialization of the low-altitude economy, helping future urban air traffic develop in a safe, environmentally friendly, and efficient direction.

[0003] To ensure practical application, the performance of ducted fans is highly dependent on the reliability verification of the test bench. Currently, traditional ducted fan test equipment has significant discrepancies between simulated operating conditions and actual aircraft operating conditions. This makes it impossible to effectively eliminate the ground effect of the ducted wake, and it can only measure thrust at different tilt angles. It is unable to accurately adjust the position of the ducted fan and measure corresponding parameters such as tilt angle, tilt accuracy, torque, and thrust.

[0004] Chinese invention patent CN118239005A provides an integrated ducted fan test bench that can simultaneously and independently measure various aerodynamic data of the duct body and rotor system. The tilt module it uses is used to tilt the entire test piece. This tilt module cannot be directly used to test the tilt mechanism characteristics of the tilt duct.

[0005] Chinese invention patent CN119435444A provides a tilting ducted fan test device that can continuously adjust the test angle of the ducted fan at any time to measure thrust at different tilt angles. When the tilting mechanism tilts, the force sensor moves relative to the ground. The vibration caused by the ducted aerodynamic force can affect the force sensor's measurement precision and accuracy. Furthermore, the tilting mechanism cannot measure the tilt angle, angular velocity, or torque of the tilting duct.

[0006] Chinese utility model patent CN221925570U provides a tilting ducted fan test platform with automatically adjustable angle of attack. This platform can test the fan's angle of attack and measure its aerodynamic characteristics during the fan's tilt transition phase. The ducted fan in this test platform is supported by a single connecting rod, which reduces reliability and safety, and the overall structure of the test platform is relatively complex. The force sensor in this test platform cannot measure the torque acting on the ducted fan as a whole. Furthermore, when the tilt is changed, the height adjustment platform is affected by the ducted wake, resulting in ground effect, which affects the measurement precision and accuracy. Summary of the Invention

[0007] (1) Technical issues to be resolved

[0008] The technical problem to be solved by the present invention is: how to achieve accurate measurement of the tilting angle, tilting accuracy, tilting angular velocity, thrust, torque, etc. of the tilting duct.

[0009] (2) Technical solution

[0010] In order to solve the above technical problems, the present invention provides a tilting duct testing device, such as Figure 1 、 Figure 4 As shown, the tilting duct testing device comprises: a mechanical main support (1), a tilting mechanism (2), and a sensor system (3);

[0011] like Figure 1 As shown, the mechanical main support (1) serves as a basic supporting structure of the test device, comprising: a first slide rail (11), a first sliding support (12), a base (13), a second slide rail (14), a second sliding support (15), a reaction frame (16), a bearing seat (17), and a U-shaped tilting support (18);

[0012] The first slide rail (11) and the second slide rail (14) are respectively installed on the front and rear sides of the base (13), and are fixedly connected in the middle of the base (13) by a crossbeam; the left side above the first slide rail (11) and the second slide rail (14), and the right side above the first slide rail (11) and the second slide rail (14) are respectively connected by a first sliding bracket (12) and a second sliding bracket (15); the bottom substrates of the first sliding bracket (12) and the second sliding bracket (15) are respectively connected to the first slide rail (11) and the second slide rail (14) by a sliding groove;

[0013] like Figure 2 、 Figure 3 As shown, the reaction frame (16) is installed above the first sliding bracket (12), and the reaction frame (16) is provided with a horizontal plate and a vertical plate integrally formed with the horizontal plate, the horizontal plate is used to be connected and fixed to the first sliding bracket (12), and a static torque sensor (31) is provided on the vertical plate;

[0014] Two bearing seats (17) are respectively mounted on the upper portion of the first sliding bracket (12) and the second sliding bracket (15) to provide a slewing support for the U-shaped tilting bracket (18); the lower bottom surface of each of the two bearing seats (17) is connected to the upper mounting surface of the corresponding sliding bracket via a three-dimensional force sensor (33), so that the three-dimensional force transmitted to the bearing seat (17) by the test piece can be tested;

[0015] The tilting mechanism (2) is used to drive the U-shaped tilting bracket (18) to rotate, thereby driving the test piece fixed between the U-shaped tilting bracket (18) to rotate, thereby meeting the posture adjustment requirements of the test piece during testing;

[0016] The sensing system (3) includes: a static torque sensor (31), an angle encoder (32), and a three-dimensional force sensor (33); Figure 2 As shown, the static torque sensor (31) is flange-type and is installed between the left side of the worm gear reducer (23) of the tilting mechanism (2) and the vertical plate of the reaction frame (16), connecting the left side of the worm gear reducer (23) of the tilting mechanism (2) with the reaction frame (16), and is used to measure the torque received by the measured part under different working conditions, and upload the torque information output by the tilting mechanism (2) to the host computer;

[0017] like Figure 3 As shown, the angle encoder (32) is installed on the output shaft inside the right bearing seat (17), and an angle scale is provided on the bearing seat (17) to intuitively read the rotation angle of the measured object. At the same time, the angle encoder (32) automatically feeds back the actual rotation angle of the measured object to the upper computer, and compares and feeds back the actual rotation angle of the measured object in real time with the controller output command, thereby improving the tilting accuracy.

[0018] The base (13) is fixed to the cast iron platform of the test room by T-slot bolts, and the front and rear sides of the upper mounting surface of the base (13) are provided with a first slide rail (11) and a second slide rail (14) in combination with each other in the form of T-slots, and a first sliding bracket (12) and a second sliding bracket (15) are respectively installed at the left and right positions to meet the span adjustment requirements of the sliding bracket.

[0019] The bottom base plates of the first sliding bracket (12) and the second sliding bracket (15) are fixed to the first sliding rail (11) and the second sliding rail (14) respectively by means of T-slot bolts, and the main bodies of the first sliding bracket (12) and the second sliding bracket (15) adopt a triangular frame structure.

[0020] The first sliding bracket (12) and the second sliding bracket (15) can adjust the distance between the two sliding brackets according to the diameter change of the test piece, so as to meet the test requirements of the test pieces with different diameter ranges and fix the ducts with different diameters.

[0021] The two ends of the U-shaped tilt bracket (18) are installed between two bearing seats (17) via a rotating shaft and driven by a tilt mechanism (2) to achieve 360-degree rotation; the two ends of the U-shaped tilt bracket (18) are provided with a clamping mechanism for a support arm of the test piece, and a connecting flange for fixing a drive motor of the test piece is provided in the middle of the U-shaped tilt bracket (18).

[0022] The method of connecting the U-shaped tilting bracket (18) only to the clamping mechanism at its left end is adopted to truly reflect the actual working posture and connection method of the duct on the vehicle body, thereby ensuring that the test simulation working conditions are similar to the actual use working conditions and improving the safety and reliability of the test device.

[0023] The reaction frame (16) and the first sliding bracket (12) are fixed via bolts.

[0024] Among them, such as Figure 2 As shown, the tilting mechanism (2) includes: a motor (21), a planetary reducer (22), and a worm gear reducer (23). The motor (21) is implemented by a servo motor and is equipped with an absolute angle encoder and a brake. The controller matched with the motor (21) has a communication interface for remote control. The reduction mechanism adopts a planetary reducer (22) and a worm gear reducer (23) installed in series to reduce speed and increase torque. The input flange interface of the planetary reducer (22) is matched with the motor (21). The worm gear reducer (23) outputs torque to a rotary shaft arranged between the U-shaped tilting bracket (18) and the bearing seat (17), and has a self-locking function.

[0025] There are two three-dimensional force sensors (33), which are respectively installed between the upper mounting surface of the first sliding bracket (12) and the second sliding bracket (15) and the lower mounting surface of the bearing seat (17). Figure 1 As shown, it is used to test the driving force of the tested part in different tilting states and upload the measured data to the host computer.

[0026] The tilting duct test device further comprises a lifting platform (4), the bottom of which is fixed to the cast iron platform of the test room by bolts;

[0027] like Figure 4As shown, the lifting platform (4) includes a lifting arm (41), a lifting slide rail (42), and a lifting bracket (43), which are welded from rectangular steel pipes and are used to install the base (13) of the mechanical main bracket (1) above the lifting platform through bolts; the height of the measured object from the ground can be adjusted by the lifting platform (4), eliminating the influence of the ground effect and realizing the simulation of the actual working condition.

[0028] The tilting duct testing device can accurately measure the tilting mechanism accuracy, the tilting angle, angular velocity, thrust, torque and other data of the duct in a simulation of the use scenario of a real duct, and evaluate the tilting characteristics of the tilting duct.

[0029] (3) Beneficial effects

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] (1) The present invention uses a three-dimensional force sensor to collect forces in three directions, calibrates the data before testing, and calculates thrust based on the actual angle measured by the angle encoder. This allows for testing duct thrust at different tilt angles. This method, combining the angle encoder with the three-dimensional force sensor, allows for more accurate thrust measurement. Furthermore, the tilt accuracy can be determined by comparing the parameters fed back by the angle encoder with the actual control angle data.

[0032] (2) The present invention increases the force transmission path by connecting the two ends of the tilting duct to the U-shaped tilting bracket and the rear end of the motor to the U-shaped tilting bracket, and then connects the U-shaped tilting bracket to the test device to ensure the stability of the test process, and can reduce the degree of damage to the lightweight tilting duct caused by large thrust and excessively fast tilting, thereby realizing the performance verification test of the large thrust tilting duct.

[0033] (3) The present invention connects a static torque sensor to one end of the worm gear reducer to measure the torque applied to the duct under different working conditions.

[0034] (4) The installation method of the duct in the present invention can truly reflect the actual working posture and connection method of the duct on the vehicle body, and can ensure that the test simulation working conditions are similar to the actual use conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of a tilting duct testing device according to this embodiment;

[0036] Figure 2 This is a schematic diagram of a tilting mechanism of a tilting duct testing device according to this embodiment;

[0037] Figure 3 This is a schematic diagram of the installation of an angle encoder for a tilting duct test device according to this embodiment;

[0038] Figure 4 This is a schematic diagram of a tilting duct test device according to this embodiment equipped with a lifting platform;

[0039] In the picture:

[0040] 1: Mechanical main bracket, 11: First slide rail, 12: First sliding bracket, 13: Base, 14: Second slide rail, 15: Second sliding bracket, 16: Reaction frame, 17: Bearing seat, 18: U-shaped tilting bracket, 2: Tilt mechanism, 21: Motor, 22: Planetary reducer, 23: Worm gear reducer, 3: Sensing system, 31: Static torque sensor, 32: Angle encoder, 33: Three-dimensional force sensor, 4: Lifting platform, 41: Lifting platform lifting arm, 42: Lifting slide rail, 43: Lifting bracket. DETAILED DESCRIPTION

[0041] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings and examples.

[0042] Example 1

[0043] In order to solve the above technical problems, this embodiment provides a tilting duct testing device, such as Figure 1 、 Figure 4 As shown, the tilting duct testing device comprises: a mechanical main support (1), a tilting mechanism (2), and a sensor system (3);

[0044] like Figure 1 As shown, the mechanical main support (1) serves as a basic supporting structure of the test device, comprising: a first slide rail (11), a first sliding support (12), a base (13), a second slide rail (14), a second sliding support (15), a reaction frame (16), a bearing seat (17), and a U-shaped tilting support (18);

[0045] The first slide rail (11) and the second slide rail (14) are respectively installed on the front and rear sides of the base (13), and are fixedly connected in the middle of the base (13) by a crossbeam; the left side above the first slide rail (11) and the second slide rail (14), and the right side above the first slide rail (11) and the second slide rail (14) are respectively connected by a first sliding bracket (12) and a second sliding bracket (15); the bottom substrates of the first sliding bracket (12) and the second sliding bracket (15) are respectively connected to the first slide rail (11) and the second slide rail (14) by a sliding groove;

[0046] like Figure 2 、 Figure 3As shown, the reaction frame (16) is installed above the first sliding bracket (12), and the reaction frame (16) is provided with a horizontal plate and a vertical plate integrally formed with the horizontal plate, the horizontal plate is used to be connected and fixed to the first sliding bracket (12), and a static torque sensor (31) is provided on the vertical plate;

[0047] Two bearing seats (17) are respectively mounted on the upper portion of the first sliding bracket (12) and the second sliding bracket (15) to provide a slewing support for the U-shaped tilting bracket (18); the lower bottom surface of each of the two bearing seats (17) is connected to the upper mounting surface of the corresponding sliding bracket via a three-dimensional force sensor (33), so that the three-dimensional force transmitted to the bearing seat (17) by the test piece can be tested;

[0048] The tilting mechanism (2) is used to drive the U-shaped tilting bracket (18) to rotate, thereby driving the test piece fixed between the U-shaped tilting bracket (18) to rotate, thereby meeting the posture adjustment requirements of the test piece during testing;

[0049] The sensing system (3) includes: a static torque sensor (31), an angle encoder (32), and a three-dimensional force sensor (33); Figure 2 As shown, the static torque sensor (31) is flange-type and is installed between the left side of the worm gear reducer (23) of the tilting mechanism (2) and the vertical plate of the reaction frame (16), connecting the left side of the worm gear reducer (23) of the tilting mechanism (2) with the reaction frame (16), and is used to measure the torque received by the measured part under different working conditions, and upload the torque information output by the tilting mechanism (2) to the host computer;

[0050] like Figure 3 As shown, the angle encoder (32) is installed on the output shaft inside the right bearing seat (17), and an angle scale is provided on the bearing seat (17) to intuitively read the rotation angle of the measured object. At the same time, the angle encoder (32) automatically feeds back the actual rotation angle of the measured object to the upper computer, and compares and feeds back the actual rotation angle of the measured object in real time with the controller output command, thereby improving the tilting accuracy.

[0051] The base (13) is fixed to the cast iron platform of the test room by T-slot bolts, and the front and rear sides of the upper mounting surface of the base (13) are provided with a first slide rail (11) and a second slide rail (14) in combination with each other in the form of T-slots, and a first sliding bracket (12) and a second sliding bracket (15) are respectively installed at the left and right positions to meet the span adjustment requirements of the sliding bracket.

[0052] The bottom base plates of the first sliding bracket (12) and the second sliding bracket (15) are fixed to the first sliding rail (11) and the second sliding rail (14) respectively by means of T-slot bolts, and the main bodies of the first sliding bracket (12) and the second sliding bracket (15) adopt a triangular frame structure.

[0053] The first sliding bracket (12) and the second sliding bracket (15) can adjust the distance between the two sliding brackets according to the diameter change of the test piece, so as to meet the test requirements of the test pieces with different diameter ranges and fix the ducts with different diameters.

[0054] The two ends of the U-shaped tilt bracket (18) are installed between two bearing seats (17) via a rotating shaft and driven by a tilt mechanism (2) to achieve 360-degree rotation; the two ends of the U-shaped tilt bracket (18) are provided with a clamping mechanism for a support arm of the test piece, and a connecting flange for fixing a drive motor of the test piece is provided in the middle of the U-shaped tilt bracket (18).

[0055] The method of connecting the U-shaped tilting bracket (18) only to the clamping mechanism at its left end is adopted to truly reflect the actual working posture and connection method of the duct on the vehicle body, thereby ensuring that the test simulation working conditions are similar to the actual use working conditions and improving the safety and reliability of the test device.

[0056] The reaction frame (16) and the first sliding bracket (12) are fixed via bolts.

[0057] Among them, such as Figure 2 As shown, the tilting mechanism (2) includes: a motor (21), a planetary reducer (22), and a worm gear reducer (23). The motor (21) is implemented by a servo motor and is equipped with an absolute angle encoder and a brake. The controller matched with the motor (21) has a communication interface for remote control. The reduction mechanism adopts a planetary reducer (22) and a worm gear reducer (23) installed in series to reduce speed and increase torque. The input flange interface of the planetary reducer (22) is matched with the motor (21). The worm gear reducer (23) outputs torque to a rotary shaft arranged between the U-shaped tilting bracket (18) and the bearing seat (17), and has a self-locking function.

[0058] There are two three-dimensional force sensors (33), which are respectively installed between the upper mounting surface of the first sliding bracket (12) and the second sliding bracket (15) and the lower mounting surface of the bearing seat (17). Figure 1 As shown, it is used to test the driving force of the tested part in different tilting states and upload the measured data to the host computer.

[0059] The tilting duct test device further comprises a lifting platform (4), the bottom of which is fixed to the cast iron platform of the test room by bolts;

[0060] like Figure 4As shown, the lifting platform (4) includes a lifting arm (41), a lifting slide rail (42), and a lifting bracket (43), which are welded from rectangular steel pipes and are used to install the base (13) of the mechanical main bracket (1) above the lifting platform through bolts; the height of the measured object from the ground can be adjusted by the lifting platform (4), eliminating the influence of the ground effect and realizing the simulation of the actual working condition.

[0061] The tilting duct testing device can accurately measure the tilting mechanism accuracy, the tilting angle, angular velocity, thrust, torque and other data of the duct in a simulation of the use scenario of a real duct, and evaluate the tilting characteristics of the tilting duct.

[0062] Example 2

[0063] This embodiment is based on the first embodiment. In this embodiment, in order to measure the aerodynamic characteristics when the measured object is a propeller, the measured propeller only needs to be fixedly connected to the connecting flange of the U-shaped tilt bracket 18. The rest is the same as the first embodiment, and the parameters such as the propeller's tilt angle, thrust, and torque can be measured.

[0064] In summary, the present invention protects a tilting duct testing device, and structures that improve the safety and reliability of the device through multi-end fixing are all within the protection scope of the present invention.

[0065] The present invention protects a tilting duct testing device, and the testing method of the connection structure designed by simulating the actual duct usage scenario is within the protection scope of the present invention.

[0066] The present invention protects a tilting duct testing device. Structures that improve the compatibility and applicability of the device by providing slide rails are all within the protection scope of the present invention.

[0067] The present invention protects a tilting duct testing device. A measurement method that improves tilting accuracy by automatically reading the rotation angle of the tilting duct and comparing it with the controller output instruction to perform feedback adjustment is within the protection scope of the present invention.

[0068] The present invention protects a tilting duct testing device, which determines the thrust of the tilting duct through a force sensor. The testing device and testing method that can evaluate the tilting characteristics of the tilting duct under different thrusts are all within the protection scope of the present invention.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A tilting duct testing device, characterized in that: The tilting duct testing device comprises: a mechanical main support (1), a tilting mechanism (2), and a sensor system (3); The mechanical main support (1) serves as a basic supporting structure of the test device, comprising: a first slide rail (11), a first sliding support (12), a base (13), a second slide rail (14), a second sliding support (15), a reaction frame (16), a bearing seat, and a U-shaped tilting support (18); The first slide rail (11) and the second slide rail (14) are respectively installed on the front and rear sides of the base (13), and are fixedly connected in the middle of the base (13) by a crossbeam; the left side above the first slide rail (11) and the second slide rail (14), and the right side above the first slide rail (11) and the second slide rail (14) are respectively connected by a first sliding bracket (12) and a second sliding bracket (15); the bottom substrates of the first sliding bracket (12) and the second sliding bracket (15) are respectively connected to the first slide rail (11) and the second slide rail (14) by a sliding groove; The reaction frame (16) is installed above the first sliding bracket (12), and the reaction frame (16) is provided with a horizontal plate and a vertical plate integrally formed with the horizontal plate, the horizontal plate is used to be connected and fixed to the first sliding bracket (12), and a static torque sensor (31) is provided on the vertical plate; Two bearing seats are respectively mounted on the upper part of the first sliding bracket (12) and the second sliding bracket (15), and are used to provide slewing support for the U-shaped tilting bracket (18); the lower bottom surface of each of the two bearing seats is connected to the corresponding upper mounting surface of the sliding bracket through a three-dimensional force sensor (33), so that the three-dimensional force transmitted to the bearing seat by the test piece can be tested; The tilting mechanism (2) is used to drive the U-shaped tilting bracket (18) to rotate, thereby driving the test piece fixed between the U-shaped tilting bracket (18) to rotate, thereby meeting the posture adjustment requirements of the test piece during the test; The sensing system (3) includes: a static torque sensor (31), an angle encoder (32), and a three-dimensional force sensor (33); the static torque sensor (31) is flange-type and is installed between the left side of the worm gear reducer (23) of the tilting mechanism (2) and the vertical plate of the reaction frame (16), connecting the left side of the worm gear reducer (23) of the tilting mechanism (2) with the reaction frame (16), and is used to measure the torque applied to the measured object under different working conditions, and upload the torque information output by the tilting mechanism (2) to the host computer; The angle encoder (32) is mounted on the output shaft inside the right bearing seat, and an angle scale is provided on the bearing seat to visually read the rotation angle of the measured part. At the same time, the angle encoder (32) automatically feeds back the actual rotation angle of the measured part to the upper computer, and compares and feeds back the actual rotation angle of the measured part to the controller output command in real time, thereby improving the tilting accuracy.

2. The tilting duct testing device according to claim 1, characterized in that: The base (13) is fixed to the cast iron platform of the test room by T-slot bolts. The front and rear sides of the upper mounting surface of the base (13) are provided with a first slide rail (11) and a second slide rail (14) in combination with each other through T-slots, and a first sliding bracket (12) and a second sliding bracket (15) are respectively installed at the left and right positions to meet the span adjustment requirements of the sliding bracket.

3. The tilting duct testing device according to claim 2, wherein: The bottom base plates of the first sliding bracket (12) and the second sliding bracket (15) are fixed to the first sliding rail (11) and the second sliding rail (14) respectively by means of T-slot bolts, and the main bodies of the first sliding bracket (12) and the second sliding bracket (15) adopt a triangular frame structure.

4. The tilting duct testing device according to claim 2, wherein: The first sliding bracket (12) and the second sliding bracket (15) can adjust the distance between the two sliding brackets according to the diameter change of the test piece, so as to meet the test requirements of the test pieces in different diameter ranges and fix the ducts with different diameters.

5. The tilting duct testing device according to claim 1, wherein: The two ends of the U-shaped tilt bracket (18) are installed between two bearing seats via a rotating shaft and driven by a tilt mechanism (2) to achieve 360-degree rotation; the two ends of the U-shaped tilt bracket (18) are provided with a clamping mechanism for a test piece support arm, and a connecting flange for fixing a test piece drive motor is provided in the middle of the U-shaped tilt bracket (18).

6. The tilting duct testing device according to claim 5, characterized in that: By adopting a method of connecting the U-shaped tilting bracket (18) only to the clamping mechanism at its left end, the actual working posture and connection method of the duct on the vehicle body are truly reflected, ensuring that the test simulation working conditions are similar to the actual use working conditions, while improving the safety and reliability of the test device.

7. The tilting duct testing device according to claim 1, wherein: The reaction frame (16) and the first sliding bracket (12) are fixed via bolt connection.

8. The tilting duct testing device according to claim 5, characterized in that: The tilting mechanism (2) comprises: a motor (21), a planetary reducer (22), and a worm gear reducer (23); the motor (21) is implemented by a servo motor and is equipped with an absolute angle encoder and a brake; a controller matched with the motor (21) has a communication interface for remote control; the reduction mechanism adopts a planetary reducer (22) and a worm gear reducer (23) installed in series to reduce speed and increase torque; the input flange interface of the planetary reducer (22) matches the motor (21); the worm gear reducer (23) outputs torque to a rotary shaft arranged between the U-shaped tilting bracket (18) and the bearing seat, and has a self-locking function.

9. The tilting duct testing device according to claim 1, wherein: There are two three-dimensional force sensors (33), which are respectively installed between the upper mounting surfaces of the first sliding bracket (12) and the second sliding bracket (15) and the lower mounting surface of the bearing seat, and are used to test the driving force of the tested component in different tilting states and upload the measurement data to the host computer.

10. The tilting duct testing device according to claim 1, wherein: The tilting duct test device further comprises a lifting platform (4), the bottom of which is fixed to the cast iron platform of the test room by bolts; The lifting platform (4) comprises a lifting arm (41), a lifting slide rail (42), and a lifting bracket (43), which are welded from rectangular steel pipes and are used to mount the base (13) of the mechanical main bracket (1) on the lifting platform via bolts; the height of the tested part from the ground can be adjusted by the lifting platform (4), thereby eliminating the influence of the ground effect and achieving simulation of actual working conditions.

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