A tilting duct test device

Abstract

This invention belongs to the field of flying car technology, specifically relating to a tilting duct testing device, comprising: a mechanical main support, a tilting mechanism, and a sensing system. The tilting duct testing device can accurately measure data such as the tilting mechanism's precision, the duct's tilting angle, angular velocity, thrust, and torque under simulated real duct usage scenarios, and evaluate the tilting characteristics of the tilting duct. This invention uses a three-dimensional force sensor to collect forces in three directions, performs data calibration before testing, and combines this with the actual angle measured by an angle encoder to calculate thrust, enabling the testing of duct thrust at different tilting angles. This method, combining an angle encoder and a three-dimensional force sensor, achieves more accurate thrust measurement. Simultaneously, the tilting accuracy can be obtained by comparing the parameters fed back by the angle encoder with the actual control angle data.

Description

Technical Field

[0001] This invention belongs to the field of flying car technology, specifically relating to a tilting duct test device. Background Technology

[0002] Ductless fan aircraft and flying cars, as representatives of low-altitude aircraft, are currently experiencing rapid development in their core power systems, specifically ducted fan propulsion devices. Ductless fans significantly improve aerodynamic efficiency and safety by enclosing the blades in a ring-shaped duct. The duct confines airflow, reducing energy loss and providing high-density thrust during vertical takeoff and landing and transitional flight, adapting to complex flight modes. Physical protection reduces the risk of blade collisions, while the duct guides airflow, enhancing stability and suppressing noise, meeting the requirements for 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, contributing to the safe, environmentally friendly, and efficient development of future urban air transportation.

[0003] To ensure practical application, the performance of ducted fans is highly dependent on the reliability verification of test benches. Currently, traditional ducted fan testing equipment simulates operating conditions that differ significantly from the actual operating conditions of aircraft. It cannot effectively eliminate the ground effect of duct wake, and can only measure thrust at different tilt angles. It cannot accurately adjust the position of the ducted fan and measure corresponding parameters such as ducted fan 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 and rotor system. The tilting module it uses is used to tilt the entire test piece. This tilting module cannot be directly used to test the tilting mechanism characteristics of tilting ducts.

[0005] Chinese invention patent CN119435444A discloses a tiltable ducted fan testing device that allows for continuous adjustment of the testing angle of the ducted fan at any time, with the aim of testing the thrust at different tilt angles. However, when this tilting structure is tilted, the force sensor moves relative to the ground, and the vibration caused by the aerodynamic forces of the duct affects the accuracy and precision of the sensor's measurements. Furthermore, the tilting mechanism cannot measure the tilt angle, angular velocity, torque, etc., of the tilted duct.

[0006] Chinese utility model patent CN221925570U discloses an experimental platform for a tilting ducted fan with automatically adjustable angle of attack. This platform can perform angle-of-attack variation tests on ducted fans and measure aerodynamic characteristics during the tilt transition phase. However, the ducted fan in this platform is supported by a single connecting rod, resulting in low reliability and safety, and the overall structure is complex. Furthermore, the force sensor in this platform cannot measure the torque acting on the ducted fan as a whole. Additionally, when changing the tilt angle, the height adjustment platform is affected by the duct wake, causing a ground effect that impacts measurement accuracy. Summary of the Invention

[0007] (a) Technical problems to be solved

[0008] The technical problem to be solved by this invention is: how to accurately measure the tilt angle, tilt accuracy, tilt angular velocity, thrust, torque, etc. of a tilting duct.

[0009] (II) Technical Solution

[0010] To solve the above-mentioned technical problems, the present invention provides a tilting duct testing device, such as... Figure 1 , Figure 4 As shown, the tilting duct testing device includes: a mechanical main support (1), a tilting mechanism (2), and a sensing system (3);

[0011] like Figure 1 As shown, the mechanical main support (1) serves as the basic support structure of the testing device and includes: a first slide rail (11), a first sliding bracket (12), a base (13), a second slide rail (14), a second sliding bracket (15), a reaction frame (16), a bearing seat (17), and a U-shaped tilting bracket (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 the base (13) is fixedly connected in the middle by a crossbeam; the left side above the first slide rail (11) and the right side above the first slide rail (11) and the second slide rail (14) are respectively connected by the first sliding bracket (12) and the second sliding bracket (15); the bottom base plates of the first sliding bracket (12) and the second sliding bracket (15) are connected to the first slide rail (11) and the second slide rail (14) respectively by sliding grooves;

[0013] like Figure 2 , Figure 3 As shown, the reaction frame (16) is installed above the first sliding bracket (12). 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 connect and fix to the first sliding bracket (12). A static torque sensor (31) is provided on the vertical plate.

[0014] Two bearing seats (17) are respectively installed on the upper part of the first sliding bracket (12) and the second sliding bracket (15) to provide 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 corresponding upper mounting surface of the sliding bracket through a three-dimensional force sensor (33), so that the three-dimensional force transmitted from the test piece to the bearing seat (17) 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 brackets (18) to rotate, so as to meet the posture adjustment requirements of the test piece during the test.

[0016] The sensing system (3) includes: a static torque sensor (31), an angle encoder (32), and a three-dimensional force sensor (33); such as Figure 2 As shown, the static torque sensor (31) adopts a 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). It connects the left side of the worm gear reducer (23) of the tilting mechanism (2) to the reaction frame (16) and is used to measure the torque of the test piece 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 bearing housing (17) on the right side, and an angle scale is provided on the bearing housing (17) to intuitively 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 host computer, compares it with the controller output command in real time and feeds it back, thereby improving the tilting accuracy.

[0018] 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 the form of T-slots. A first sliding bracket (12) and a second sliding bracket (15) are installed at the left and right positions respectively to meet the span adjustment needs 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 slide rail (11) and the second slide rail (14) respectively by T-slot bolts. The main body of the first sliding bracket (12) and the second sliding bracket (15) adopts 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 test pieces with different diameter ranges and fix ducts of different diameters.

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

[0022] In this way, by using a U-shaped tilting bracket (18) connected only to its left end clamping mechanism, the actual working posture and connection method of the duct on the vehicle body are 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.

[0023] The reaction frame (16) and the first sliding bracket (12) are fixed together by 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 a servo motor, 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 uses a planetary reducer (22) and a worm gear reducer (23) connected in series for speed reduction and torque increase. The input flange interface of the planetary reducer (22) is matched with the motor (21). The worm gear reducer (23) outputs torque to the rotating shaft set 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 lower mounting surface of the bearing seat (17) and the second sliding bracket (15), respectively. Figure 1 As shown, it is used to test the driving force of the test piece under different tilting states and upload the measurement data to the host computer.

[0026] The tilting culvert testing device also includes a lifting platform (4), the bottom of which is fixed to the cast iron platform of the test chamber 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 used to install the mechanical main support (1) base (13) above the lifting platform by bolts; the height of the test piece from the ground can be adjusted by the lifting platform (4) to eliminate the influence of the ground effect and realize the simulation of the actual working conditions.

[0028] The tilting duct testing device can accurately measure data such as the tilting mechanism accuracy, tilting angle, angular velocity, thrust, and torque of the duct under simulated real duct usage scenarios, and evaluate the tilting characteristics of the tilting duct.

[0029] (III) Beneficial Effects

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

[0031] (1) This invention collects forces in three directions using a three-dimensional force sensor and performs data calibration before testing. Thrust is calculated by combining the actual angle measured by an angle encoder, enabling the testing of duct thrust at different tilt angles. This method, combining an angle encoder with a three-dimensional force sensor, achieves more accurate thrust measurement. Simultaneously, tilt accuracy can be obtained 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 both ends of the tilting duct to the U-shaped tilting bracket and the rear end of the motor to the U-shaped tilting bracket. The stability of the test process is ensured by connecting the U-shaped tilting bracket to the test device. This can also reduce the damage to the lightweight tilting duct caused by high thrust and excessive tilting, thereby realizing the performance verification test of the high 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 experienced by the duct under different working conditions.

[0034] (4) The installation method of the duct in this 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 working conditions. Attached Figure Description

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

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

[0038] Figure 4 This is a schematic diagram of a tilting culvert testing device with a lifting platform added in this embodiment;

[0039] In the picture:

[0040] 1: Main mechanical support; 11: First slide rail; 12: First sliding support; 13: Base; 14: Second slide rail; 15: Second sliding support; 16: Reaction frame; 17: Bearing seat; 18: U-shaped tilting support; 2: Tilting 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 support. Detailed Implementation

[0041] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0042] Example 1

[0043] To address the aforementioned technical problems, this embodiment provides a tilting duct testing device, such as... Figure 1 , Figure 4 As shown, the tilting duct testing device includes: a mechanical main support (1), a tilting mechanism (2), and a sensing system (3);

[0044] like Figure 1 As shown, the mechanical main support (1) serves as the basic support structure of the testing device and includes: a first slide rail (11), a first sliding bracket (12), a base (13), a second slide rail (14), a second sliding bracket (15), a reaction frame (16), a bearing seat (17), and a U-shaped tilting bracket (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 the base (13) is fixedly connected in the middle by a crossbeam; the left side above the first slide rail (11) and the right side above the first slide rail (11) and the second slide rail (14) are respectively connected by the first sliding bracket (12) and the second sliding bracket (15); the bottom base plates of the first sliding bracket (12) and the second sliding bracket (15) are connected to the first slide rail (11) and the second slide rail (14) respectively by sliding grooves;

[0046] like Figure 2 , Figure 3As shown, the reaction frame (16) is installed above the first sliding bracket (12). 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 connect and fix to the first sliding bracket (12). A static torque sensor (31) is provided on the vertical plate.

[0047] Two bearing seats (17) are respectively installed on the upper part of the first sliding bracket (12) and the second sliding bracket (15) to provide 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 corresponding upper mounting surface of the sliding bracket through a three-dimensional force sensor (33), so that the three-dimensional force transmitted from the test piece to the bearing seat (17) 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 brackets (18) to rotate, so as to meet the posture adjustment requirements of the test piece during the test.

[0049] The sensing system (3) includes: a static torque sensor (31), an angle encoder (32), and a three-dimensional force sensor (33); such as Figure 2 As shown, the static torque sensor (31) adopts a 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). It connects the left side of the worm gear reducer (23) of the tilting mechanism (2) to the reaction frame (16) and is used to measure the torque of the test piece 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 bearing housing (17) on the right side, and an angle scale is provided on the bearing housing (17) to intuitively 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 host computer, compares it with the controller output command in real time and feeds it back, thereby improving the tilting accuracy.

[0051] 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 the form of T-slots. A first sliding bracket (12) and a second sliding bracket (15) are installed at the left and right positions respectively to meet the span adjustment needs 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 slide rail (11) and the second slide rail (14) respectively by T-slot bolts. The main body of the first sliding bracket (12) and the second sliding bracket (15) adopts 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 test pieces with different diameter ranges and fix ducts of different diameters.

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

[0055] In this way, by using a U-shaped tilting bracket (18) connected only to its left end clamping mechanism, the actual working posture and connection method of the duct on the vehicle body are 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.

[0056] The reaction frame (16) and the first sliding bracket (12) are fixed together by 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 a servo motor, 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 uses a planetary reducer (22) and a worm gear reducer (23) connected in series for speed reduction and torque increase. The input flange interface of the planetary reducer (22) is matched with the motor (21). The worm gear reducer (23) outputs torque to the rotating shaft set 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 lower mounting surface of the bearing seat (17) and the second sliding bracket (15), respectively. Figure 1 As shown, it is used to test the driving force of the test piece under different tilting states and upload the measurement data to the host computer.

[0059] The tilting culvert testing device also includes a lifting platform (4), the bottom of which is fixed to the cast iron platform of the test chamber 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 used to install the mechanical main support (1) base (13) above the lifting platform by bolts; the height of the test piece from the ground can be adjusted by the lifting platform (4) to eliminate the influence of the ground effect and realize the simulation of the actual working conditions.

[0061] The tilting duct testing device can accurately measure data such as the tilting mechanism accuracy, tilting angle, angular velocity, thrust, and torque of the duct under simulated real duct usage scenarios, and evaluate the tilting characteristics of the tilting duct.

[0062] Example 2

[0063] This embodiment is based on Embodiment 1. In this embodiment, in order to measure the aerodynamic characteristics of the test component when it is a propeller, the test component propeller only needs to be fixedly connected to the connecting flange of the U-shaped tilt bracket 18. Everything else is the same as in Embodiment 1, so that the tilt angle, thrust, torque and other parameters of the propeller can be measured.

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

[0065] This invention protects a tilting duct testing device and a testing method that designs the connection structure by simulating real duct usage scenarios, all of which are within the scope of protection of this invention.

[0066] This invention protects a tilting duct testing device. The structure that improves the compatibility and applicability of the device by setting up a slide rail is also within the protection scope of this invention.

[0067] This invention protects a tilting duct testing device, which improves tilting accuracy by automatically reading the rotation angle of the tilting duct and comparing it with the output command of the controller for feedback adjustment. All of these methods are within the protection scope of this invention.

[0068] This invention protects a tilting duct testing device, which uses a force sensor to determine the thrust of the tilting duct, and the testing device and method for evaluating the tilting characteristics of the tilting duct under different thrusts are both within the scope of protection of this invention.

[0069] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A tilting duct testing device, characterized in that, The tilting duct testing device includes: a mechanical main support (1), a tilting mechanism (2), and a sensing system (3); The mechanical main support (1) serves as the basic support structure of the testing device and includes: a first slide rail (11), a first sliding bracket (12), a base (13), a second slide rail (14), a second sliding bracket (15), a reaction frame (16), a bearing seat, and a U-shaped tilting bracket (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 the base (13) is fixedly connected in the middle by a crossbeam; the left side above the first slide rail (11) and the right side above the first slide rail (11) and the second slide rail (14) are respectively connected by the first sliding bracket (12) and the second sliding bracket (15); the bottom base plates of the first sliding bracket (12) and the second sliding bracket (15) are connected to the first slide rail (11) and the second slide rail (14) respectively by sliding grooves; The reaction frame (16) is installed above the first sliding bracket (12). 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 connect and fix to the first sliding bracket (12). A static torque sensor (31) is provided on the vertical plate. Two bearing seats are respectively installed on the upper part of the first sliding bracket (12) and the second sliding bracket (15) 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 upper mounting surface of the corresponding sliding bracket through a three-dimensional force sensor (33), so that the three-dimensional force transmitted from the test piece to the bearing seat 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 brackets (18) to rotate, so as to meet 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) to the reaction frame (16), and is used to measure the torque of the test piece under different working conditions, and upload the torque information output by the tilting mechanism (2) to the host computer; The angle encoder (32) is installed on the output shaft inside the bearing housing on the right side, and an angle scale is provided on the bearing housing to intuitively 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 host computer, compares it with the controller output command in real time and feeds it back, thereby improving the tilting accuracy.

2. The tilting duct testing device as described in 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 the form of T-slots. A first sliding bracket (12) and a second sliding bracket (15) are installed at the left and right positions respectively to meet the span adjustment needs of the sliding bracket.

3. The tilting duct testing device as described in claim 2, characterized in that, The bottom base plates of the first sliding bracket (12) and the second sliding bracket (15) are fixed to the first slide rail (11) and the second slide rail (14) respectively by T-slot bolts. The main body of the first sliding bracket (12) and the second sliding bracket (15) adopts a triangular frame structure.

4. The tilting duct testing device as described in claim 2, characterized in that, 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 test pieces with different diameter ranges and fix ducts with different diameters.

5. The tilting duct testing device as described in claim 1, characterized in that, The U-shaped tilting bracket (18) is mounted between two bearing seats through a rotating shaft at both ends and is driven by the tilting mechanism (2) to achieve 360-degree rotation; the U-shaped tilting bracket (18) is provided with clamping mechanisms for the support arm of the test piece at both ends, and a connecting flange for fixing the drive motor of the test piece is provided in the middle part of the U-shaped tilting bracket (18).

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

7. The tilting duct testing device as described in claim 1, characterized in that, The reaction frame (16) and the first sliding bracket (12) are fixed together by bolts.

8. The tilting duct testing device as described in claim 5, characterized in that, The tilting mechanism (2) includes: a motor (21), a planetary reducer (22), and a worm gear reducer (23). The motor (21) is a servo motor 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 uses a planetary reducer (22) and a worm gear reducer (23) connected in series for speed reduction and torque increase. The input flange interface of the planetary reducer (22) is matched with the motor (21). The worm gear reducer (23) outputs torque to the rotating shaft located between the U-shaped tilting bracket (18) and the bearing seat, and has a self-locking function.

9. The tilting duct testing device as described in claim 1, characterized in that, 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 lower mounting surface of the bearing seat, and are used to test the driving force of the test piece under different tilting states and upload the measurement data to the host computer.

10. The tilting duct testing device as described in claim 1, characterized in that, The tilting culvert testing device also includes a lifting platform (4), the bottom of which is fixed to the cast iron platform of the test chamber by bolts; 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 used to install the base (13) of the main mechanical support (1) above the lifting platform by bolts; the height of the test piece from the ground can be adjusted by the lifting platform (4) to eliminate the influence of the ground effect and realize the simulation of the actual working conditions.

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