Unmanned aerial vehicle propeller lift force test platform and working method

Abstract

The invention discloses an unmanned aerial vehicle propeller lift force testing platform and a working method, relates to the technical field of unmanned aerial vehicle lift force testing, and aims to solve the technical problem of single testing environment. The unmanned aerial vehicle propeller lift force testing platform comprises a testing base, a fixing plate is installed in the center of the top of the testing base, and a pressure testing module is installed in the center of the bottom of the fixing plate; the top of the test base is provided with an inner and outer cover body, the inner and outer cover body is composed of an outer cover and an inner cover, a liquid storage cavity is arranged between the outer cover and the inner cover, the inner cover comprises a deformable part, the deformable part is made of a deformable material capable of changing the volume of an internal space, the deformable part and the top of the inner cover are provided with a plurality of liquid inlet heads, and liquid feeding pieces are arranged above the liquid inlet heads. A liquid storage cylinder is arranged at the bottom of the liquid inlet head, a low-vacuum environment for reducing the boiling point of water is arranged in the liquid storage cylinder, and a rotary closing structure is arranged on the lower half portion of the liquid storage cylinder. The method has the effect of simulating various environments, and provides accurate prediction for the lift performance of the unmanned aerial vehicle propeller in a special environment.

Description

Technical Field

[0001] The present invention relates to the technical field of UAV lift testing, and more specifically, to a UAV propeller lift testing platform and a working method thereof. Background Art

[0002] Currently, most mainstream propeller lift tests are carried out under standard atmospheric pressure and in a dry environment, and cannot simulate the influence of special environments such as low pressure and fog on lift performance. For example, when operating in plateau or high-altitude areas, the UAV faces a low-pressure environment with thin air, and the aerodynamic efficiency of the propeller will decrease significantly. The existing test platforms cannot accurately evaluate the lift attenuation in this scenario, resulting in risks such as insufficient power and sudden reduction in endurance during actual flight of the UAV. In addition, in tasks such as agricultural plant protection and meteorological monitoring that require passing through fog or humid environments, the surface of the propeller is likely to change its aerodynamic shape due to fog adhesion, causing lift fluctuations or even stall. However, traditional test platforms lack the ability to simulate fog environments and are difficult to detect such potential defects in advance. In view of this, we propose a UAV propeller lift testing platform and a working method thereof. Summary of the Invention

[0003] The purpose of the present invention is to provide a UAV propeller lift testing platform and a working method thereof to solve the technical problem of a single test environment.

[0004] To solve the above technical problem, the present invention provides the following technical solution: A UAV propeller lift testing platform, including a test base, a fixing plate is installed at the center of the top of the test base, a pressure testing module is installed at the center of the bottom of the fixing plate, a driving motor is arranged below the fixing plate, a sleeve is connected to the driving end of the driving motor, a limiting rod is sleeved on the sleeve in a limiting and sliding manner, a pressing ball in contact with the fixing plate is fixed on the outer periphery of the bottom end of the limiting rod, and a test propeller is installed at the top end of the limiting rod; An inner and outer housing is installed on the top of the test base, the inner and outer housing is composed of an outer housing and an inner housing, a liquid storage cavity is arranged between the outer housing and the inner housing, water liquid is stored inside the liquid storage cavity, the inner housing includes a deformable part, the deformable part is made of a deformable material that changes the internal space volume, the deformable part, a plurality of liquid inlet heads are installed at the top position of the inner housing, a liquid delivery member is installed above the liquid inlet heads, a liquid storage cylinder is arranged at the bottom of the liquid inlet head, a low-vacuum environment that reduces the boiling point of the water liquid is inside the liquid storage cylinder, and a closing structure is arranged at the lower half of the liquid storage cylinder.

[0005] Preferably, the outer housing is made of a hard material, and the top part of the outer housing is transparent glass for observing the inside, the inner housing includes a hard connection part, the hard connection part is connected to the deformable part, and a transparent glass part is fixed at the top of the deformable part.

[0006] Preferably, the liquid delivery member includes a connecting rod, the connecting rod is fixed to the inner top wall of the outer cover, a plurality of connecting sleeves that fit against the inner wall of the liquid inlet head are connected to the bottom of the connecting rod, a sealing rubber ring is bonded to the outer periphery of the connecting sleeve, and a water storage space for storing the corresponding amount of water liquid is formed between the plurality of connecting sleeves.

[0007] Preferably, the liquid storage cylinder includes a positioning ring, a negative pressure air port communicated with an external air extraction device is communicated with the top of the positioning ring, a bottom plate is arranged below the positioning ring, an extension connecting rod is fixed between the bottom plate and the positioning ring, and a plurality of fixed arc baffles are fixed to the bottom edge part of the positioning ring.

[0008] Preferably, the closing structure includes a closing piece sunken into the top of the bottom plate, a rotating motor is installed at the center of the bottom of the closing piece, a plurality of closing arc baffles are fixed to the outer peripheral edge of the top of the closing piece, the plurality of closing arc baffles and the fixed arc baffles form a closed ring body, and a sealing rubber layer is bonded to the contact part between the closing arc baffle and the fixed arc baffle.

[0009] Preferably, a plurality of drainage grooves are formed in the inner wall of the liquid inlet head, and the drainage grooves are communicated with the positioning ring.

[0010] Preferably, a rotating shaft is arranged at the center of the top of the closing piece, a plurality of first extrusion rotating pieces are fixed to the outer periphery of the rotating shaft, a round head is arranged at the center of the inner periphery of the positioning ring, an intermediate connecting rod is connected between the round head and the positioning ring, a one-way shaft sleeve is rotatably connected to the outer periphery of the round head, a plurality of second extrusion rotating pieces are connected to the outer periphery of the one-way shaft sleeve, and a honeycomb film made of a soft material is bonded between the plurality of second extrusion rotating pieces and the first extrusion rotating pieces.

[0011] Preferably, a heating plate is arranged at the center of the closing piece, a heating wire is installed in a serpentine shape inside the heating plate, a heat exchange and condensation plate is fixed to the inner bottom wall of the positioning ring, a plurality of liquid inlet ports are formed in the heat exchange and condensation plate, and a plurality of external heat exchange rods are connected to the outer edge of the heat exchange and condensation plate.

[0012] Preferably, the first extrusion rotating piece and the second extrusion rotating piece are in a wavy fan-shaped structure, and an elastic rubber body is wound and tightened between the top edge of the closing piece and the bottom edge of the positioning ring.

[0013] A working method applying the above-mentioned drone propeller lift test platform includes the following steps: S1. Install the propeller at the top end of the limiting rod, start the driving motor to make it rotate, and measure and display the lift data through the pressure test module; S2. Heat the deformable part to expand the space of the inner cover and reduce the air density; supplement with a hydraulic rod to control the sealing performance, simulate the plateau low-pressure environment, and test the lift under the plateau low-pressure environment; S3. Extract air to reduce the air pressure in the liquid storage cylinder, and at the same time expand the space of the inner cover to further reduce the pressure; S4. Heat the water in the liquid storage cylinder until it boils into mist. The mist condenses to dissipate heat and lower the temperature. The whole process is sealed to maintain low pressure, and the lift is tested under a two-factor environment. S5. Heat the water in the liquid storage cylinder into mist, and evenly discharge it into the inner cover through a closed structure and a squeezing rotating blade, simulating the actual scenario to realize the test of the lift under a mist environment.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention consists of an outer cover and an inner cover for the inner and outer covers. The deformable part of the inner cover can change the volume of the internal space. By deforming the deformable part to expand the space, the internal air density can be reduced, simulating a low-pressure environment such as a plateau or high-altitude area, so as to evaluate the aerodynamic efficiency and lift attenuation of the propeller under different air densities, providing an accurate prediction for the flight performance of the drone in a special environment and solving the problem of a single test environment.

[0015] 2. The present invention also sets a liquid storage cavity between the outer cover and the inner cover, and cooperates with structures such as a liquid inlet head, a liquid delivery part, and a liquid storage cylinder. It can absorb heat during the process of rapid boiling due to the decrease in the boiling point of the water liquid and the conversion of the condensed mist under the internal low-pressure environment, realizing temperature reduction. The whole temperature reduction process is sealed without introducing external gas, ensuring the consistency of the internal low-pressure coefficient environment, helping to more accurately simulate the influence of a special environment on the lift of the propeller, and solving the problem of a single test environment.

[0016] 3. The present invention also has a closed structure of the liquid storage cylinder, which can transport the water mist into the inner cover after all the internal water liquid is converted into water mist, and can control the degree of mist by controlling the amount of water liquid input into the water storage space. This process is sealed throughout without introducing external air, avoiding interference from external substances to the test, ensuring the consistency of the test environment, and effectively evaluating the lift fluctuation and potential defects of the propeller in a mist or humid environment, solving the problem of a single test environment.

[0017] 4. The present invention also has structures such as a rotating shaft on the closing piece, a first squeezing rotating blade, a round head in the positioning ring, a second squeezing rotating blade, and a honeycomb film. When the closing piece is opened, it can quickly discharge the mist and make it evenly distributed by squeezing the honeycomb film and the rotation of the fan body, improving the efficiency and quality of simulating the mist environment, and enhancing the practicability and reliability of the test platform.

[0018] 5. The present invention also drives the test propeller to rotate by a driving motor, and measures the upward pulling force generated by the propeller by using a force sensor or a weighing device in the pressure test module, accurately obtaining the lift data, providing a reliable basis for the performance evaluation of the propeller. The inner and outer covers are installed on the test base and sealed with a rubber sealing ring and bolts, effectively isolating the test environment from the outside and avoiding interference from external factors to the test results, ensuring the accuracy and reliability of the test. Description of the Drawings

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a half-sectional structural schematic diagram of the present invention.

[0021] Figure 3 It is a half-sectional structural schematic diagram of the test base in the present invention.

[0022] Figure 4 It is a separation structural schematic diagram of the liquid delivery member and the liquid storage cylinder in the present invention.

[0023] Figure 5 It is a matching structural schematic diagram of the liquid inlet head and the liquid delivery member in the present invention.

[0024] Figure 6 It is an internal structural schematic diagram of the present invention in a non-mist-releasing state.

[0025] Figure 7 It is a connection structural schematic diagram of the lower half of the liquid storage cylinder in the present invention.

[0026] Figure 8 It is a half-sectional connection structural schematic diagram of the lower half of the liquid storage cylinder in the present invention.

[0027] Figure 9 It is a structural schematic diagram of the upper half of the liquid storage cylinder in the present invention.

[0028] Figure 10 It is a structural schematic diagram of the liquid storage cylinder in a mist-releasing state in the present invention.

[0029] Figure 11 It is a structural schematic diagram of the elastic rubber body in a tightened state in the present invention.

[0030] Description of the reference numerals in the figure: 1. Test base; 2. Fixed plate; 3. Test module; 4. Driving motor; 5. Sleeve; 6. Limiting rod; 7. Pressing ball; 8. Test propeller; 9. Inner and outer housings; 10. Liquid storage cavity; 11. Liquid inlet head; 12. Liquid delivery member; 13. Liquid storage cylinder; 14. Closing structure; 15. Drainage groove; 16. Honeycomb film; 17. Elastic rubber body; 18. Display screen; 91. Outer housing; 92. Inner housing; 921. Hard connection part; 922. Deformable part; 923. Transparent glass part; 121. Connecting rod; 122. Connecting sleeve; 123. Water storage space; 131. Positioning ring; 132. Bottom plate; 133. Extension connecting rod; 134. Fixed arc baffle; 141. Rotating closing piece; 142. Rotating motor; 143. Rotating closing arc baffle; 144. Rotating shaft; 145. First extrusion rotating piece; 146. Round head; 147. Intermediate connecting rod; 148. One-way bushing; 149. Second extrusion rotating piece; 151. Heating plate; 152. Heating wire; 153. Heat exchange and condensation plate; 154. External heat exchange rod. Specific implementation mode

[0031] As Figures 1 to 11 As shown in the figure, a lift test platform for a drone propeller according to the present invention includes a test base 1. A fixing plate 2 is installed at the center of the top of the test base 1. A test module 3 is installed at the center of the bottom of the fixing plate 2. The test module 3 includes a force sensor or a weighing device. A display screen 18 is further provided on the outside of the test base 1. The display screen 18 is used to display data. A driving motor 4 is provided below the fixing plate 2. The driving end of the driving motor 4 is connected to a sleeve 5. The sleeve 5 is limited and slidably sleeved with a limiting rod 6. A pressing ball 7 in contact with the fixing plate 2 is fixed on the outer periphery of the bottom end of the limiting rod 6. A test propeller 8 is installed at the top end of the limiting rod 6.

[0032] Working principle: When the external control structure controls the driving motor 4 to operate and the test propeller 8 rotates, a rising force is driven on the limiting rod 6. The pressing ball 7 contacts the test module 3. The upward pulling force generated by the propeller, that is, the lift force, is measured through the force sensor or the weighing device. Thus, the lift force test can be completed.

[0033] In order to achieve more accurate testing, it is necessary to isolate the external environment. An inner and outer cover 9 is installed on the top of the test base 1. The bottom outer periphery of the inner and outer cover 9 is installed and sealed through a rubber sealing ring and bolts, so that it will not be affected by the outside during detection.

[0034] In order to test in environments with different air densities, the inner and outer cover 9 is composed of an outer cover 91 and an inner cover 92. The outer cover 91 is made of a hard material, and the top part of the outer cover 91 is a transparent glass for observing the inside. The inner cover 92 includes a deformable part 922. The deformable part 922 is made of a deformable material for changing the internal space volume. The deformable material can be selected as Wood's alloy that can be deformed by heat. If it is Wood's alloy, heating pipes, wires and other devices need to be installed on the inner wall or outer periphery for deformation control. This is arranged according to the selected material. Sealing treatment is added to the connection parts at both ends of the deformable part 922. The inner cover 92 also includes a hard connection part 921. The hard connection part 921 is connected to the deformable part 922. A transparent glass part 923 is fixed on the top of the deformable part 922. The transparent glass part 923 is convenient for observing the inside.

[0035] It should be noted that according to different detection levels, a hydraulic rod connecting the transparent glass part 923 and the top part of the outer cover 91 can be selectively installed to assist in position control, avoiding situations such as excessive pressure difference causing position deviation, etc. Working principle: When it is necessary to adjust the air density inside, the deformable part 922 is deformed to expand the internal space. Since the inside is sealed, the air density decreases as the space volume increases. Further, an environment simulating low pressure can be achieved.

[0036] In order to simulate an environment of low pressure and low temperature, a liquid storage cavity 10 is provided between the outer cover 91 and the inner cover 92. The liquid storage cavity 10 stores water liquid inside. Multiple liquid inlet heads 11 are installed at the top position of the deformable part 922 and the inner cover 92. A liquid delivery part 12 is installed above the liquid inlet heads 11. The liquid delivery part 12 includes a connecting rod 121. The connecting rod 121 is fixed to the inner top wall of the outer cover 91. The bottom of the connecting rod 121 is connected with a plurality of connecting sleeves 122 that fit the inner wall of the liquid inlet head 11. A sealing rubber ring is bonded to the outer periphery of the connecting sleeve 122. A water storage space 123 for storing the corresponding amount of water liquid is provided between the multiple connecting sleeves 122. A liquid storage cylinder 13 is provided at the bottom of the liquid inlet head 11. The inside of the liquid storage cylinder 13 is in a low-vacuum environment that reduces the boiling point of the water liquid. The liquid storage cylinder 13 includes a positioning ring 131. A plurality of drainage grooves 15 are formed in the inner wall of the liquid inlet head 11. The drainage grooves 15 communicate with the positioning ring 131. The top of the positioning ring 131 is connected with a negative pressure air port communicating with an external air extraction device. A bottom plate 132 is provided below the positioning ring 131. An extension connecting rod 133 is fixed between the bottom plate 132 and the positioning ring 131. A plurality of fixed arc baffles 134 are fixed to the bottom edge part of the positioning ring 131. A sealed plate body is provided between the multiple fixed arc baffles 134. A heating plate 151 is provided on the top of the bottom plate 132. The peripheral material of the heating plate 151 can be made of a material with high heat insulation performance. A heating wire 152 is installed in a serpentine shape inside the heating plate 151. A heat exchange and condensation plate 153 is fixed to the inner bottom wall of the positioning ring 131. The heat exchange and condensation plate 153 is provided with a plurality of liquid inlets, which are convenient for the entry of water liquid. A plurality of external heat exchange rods 154 are connected to the outer edge of the heat exchange and condensation plate 153.

[0037] If the power supply is connected by wiring through the inner and outer covers 9, a sealing rubber ring needs to be added to the part where the wire passes through to ensure internal sealing.

[0038] It should be introduced that the internal low-pressure situation of the air can be controlled. For example, when the internal air pressure drops to 6.3 kPa (about 6% of the standard atmospheric pressure), the boiling point of water can drop to 40 °C.

[0039] Working principle: First, an external air extraction device is used to suck the air inside the liquid storage cylinder 13 to create a low-pressure space. When the deformable part 922 deforms to expand the space, the transparent glass part 923 rises. Since the liquid storage cavity 10 is filled with water liquid, during the rising process, the connecting sleeve 122 descends inside the liquid inlet head 11. The water storage space 123 between every two adjacent connecting sleeves 122 is fixed. After the fixed descent, a certain amount of water liquid will enter the drainage groove 15. With the cooperation of negative pressure suction, the water liquid quickly enters the liquid storage cylinder 13.

[0040] Through the heating of the external heating wire 152 (at this time, the heating temperature is relatively low to ensure that a cycle can be generated between states), the heating plate 151 is heated up to heat the water liquid. Due to the low-pressure environment inside, the boiling point of the water liquid is greatly reduced, enabling it to boil rapidly and turn into mist. The mist rises and contacts the heat exchange and condensation plate 153. Multiple external heat exchange rods 154 on the side of the heat exchange and condensation plate 153 absorb the internal heat. Thus, when the mist contacts the heat exchange and condensation plate 153, it can be transformed into water liquid. Through this transformation process, heat can be quickly absorbed to achieve cooling.

[0041] It is worth introducing that the above cooling process is fully sealed without any external gas entering, which can ensure the consistency of the internal low-pressure coefficient environment and is helpful for the test.

[0042] When a mist environment needs to be simulated, a closing structure 14 is provided at the lower half of the liquid storage cylinder 13. The closing structure 14 includes a closing piece 141 sunken inside the top of the bottom plate 132. The heating plate 151 is sunken at the center position of the closing piece 141. A rotating motor 142 is installed at the center of the bottom of the closing piece 141. A waterproof mist housing is provided outside the rotating motor 142. A plurality of closing arc baffles 143 are fixed on the outer peripheral edge of the top of the closing piece 141. The plurality of closing arc baffles 143 and the fixed arc baffle 134 form a closed ring body. A sealing rubber layer is bonded to the contact part between the closing arc baffle 143 and the fixed arc baffle 134.

[0043] Working principle: Since the air inside the liquid storage cylinder 13 is fixed and can be controlled through an external air extraction device, by increasing the heating temperature of the heating wire 152 (this heating temperature is relatively high), after all the water liquid is converted into water mist, the rotating motor 142 operates to drive the rapid opening of the closing piece 141. The water mist inside enters the inner cover 92, and a certain amount of water liquid is quantitatively input into the water storage space 123, enabling the degree of mist inside to be regulated.

[0044] It is worth introducing that although an external fog-making device can also achieve the delivery of mist, it will also bring in external air and other substances, affecting the consistency of the test; while the above process of inputting mist is also fully sealed without external air entering, which can ensure the consistency of the internal low-pressure coefficient environment and is helpful for the test.

[0045] To improve the efficiency of fog output, a rotating shaft 144 is provided at the center of the top of the rotary closing piece 141. A plurality of first extrusion rotary pieces 145 are fixed to the outer periphery of the rotating shaft 144. A round head 146 is provided at the center of the inner periphery of the positioning ring 131. A connecting rod 147 is connected between the round head 146 and the positioning ring 131. The outer periphery of the round head 146 is rotatably connected with a one-way shaft sleeve 148. The one-way shaft sleeve 148 allows free rotation in one direction and non-rotation in the other direction. A plurality of second extrusion rotary pieces 149 are connected to the outer periphery of the one-way shaft sleeve 148. A honeycomb film 16 made of a soft material is bonded between the plurality of second extrusion rotary pieces 149 and the first extrusion rotary pieces 145. The honeycomb film 16 helps to improve the efficiency of heating and atomization. The first extrusion rotary pieces 145 and the second extrusion rotary pieces 149 are in a wavy fan-shaped structure.

[0046] Working principle: During the process of the cyclone opening the rotary closing piece 141, due to its wavy fan-shaped structure and the design of the plurality of second extrusion rotary pieces 149 and the first extrusion rotary pieces 145, when it is opened, the first extrusion rotary pieces 145 squeeze the honeycomb film 16. At the same time, the second extrusion rotary pieces 149 limit the rotation direction, and a rotating fan-shaped body can be formed. Through the space of squeezing the honeycomb film 16 and the rotation of the fan-shaped body, the fog can be quickly discharged and evenly distributed.

[0047] To improve the sealing performance, an elastic rubber body 17 is wound and tightened between the top edge of the rotary closing piece 141 and the bottom edge of the positioning ring 131. The mutual tightening of the multi-strand elastic rubber body 17 improves the sealing and at the same time improves the structural stability.

[0048] A working method of an unmanned aerial vehicle propeller lift test platform; I. Basic lift test process Installation and initialization: Install the test propeller 8 at the top of the limit rod 6 to ensure a firm connection. Start the drive motor 4 through the external control structure to drive the propeller to rotate and generate an upward lift force. The limit rod 6 moves upward due to the lift force, and the pressure contact ball 7 at its bottom contacts the pressure test module 3 at the bottom of the fixed plate 2. The force sensor or weighing device measures the lift data in real time and displays it through the display screen.

[0049] Standard environment test: Under the default state, the inner and outer covers 9 are kept sealed, and the test is carried out under standard atmospheric pressure and normal temperature environment to obtain the basic lift data of the propeller.

[0050] II. Low-pressure environment simulation test Adjust the internal space volume: When it is necessary to simulate a low-pressure environment such as a plateau scene, control the deformable part 922 to be deformed by heating such as Wood's alloy heating to expand the internal space of the inner cover 92, resulting in a decrease in air density and forming a low-pressure environment. The position of the transparent glass part 923 can be assisted by a hydraulic rod to avoid deviation caused by too large a pressure difference.

[0051] Low-pressure environment lift test: Repeat the basic test process, measure the lift data of the propeller in a low-pressure environment, compare with the standard environment data, and evaluate the attenuation effect of rarefied air on lift.

[0052] III. Low-pressure and low-temperature environment simulation test Construct a low-pressure environment: First, evacuate the inside of the liquid storage cylinder 13 through an external air extraction device to form a low-vacuum environment, reduce the boiling point of the water liquid (such as reducing it to 40 °C, which can be further reduced in actual use so that heating is no longer required, and heat exchange is carried out in cooperation with the external environment to achieve state conversion), control the deformation of the deformable part 922, expand the inner cover space, and further reduce the air pressure inside the inner cover.

[0053] Cooling process: The heating plate 151 heats the water liquid in the liquid storage cylinder through the heating wire 152, causing it to boil rapidly under low pressure to generate mist. The mist rises to the heat exchange and condensation plate 153, and is condensed into liquid water through heat dissipation by the external heat exchange rod 154, circulating to absorb heat and reduce the temperature inside the inner cover. The whole process is sealed to ensure that the low-pressure environment is not disturbed by external air.

[0054] Low-temperature and low-pressure environment test: In the low-pressure environment after cooling, start the propeller test and record the lift changes under low temperature and low pressure.

[0055] IV. Mist environment simulation test Mist generation: The liquid delivery part 12 quantitatively delivers water liquid to the liquid storage cylinder 13. The heating plate 151 raises the temperature to completely vaporize the water liquid into water mist. The rotating motor 142 drives the rotary closing piece 141 to quickly open. The first extrusion rotary piece 145 and the second extrusion rotary piece 149 cooperate to squeeze the honeycomb film 16, and uniformly discharge the mist into the inner cover 92. The propeller rotates in the mist environment to simulate scenarios such as agricultural plant protection and meteorological monitoring, observe the influence of mist adhesion on the aerodynamic shape of the propeller, and measure the lift value.

[0056] V. Data recording In each test session, the display screen records parameters such as lift value, air pressure, temperature, and mist concentration in real time. Compare the data differences in different environments to provide a basis for the design and flight strategy optimization of the drone.

[0057] Key technical points Sealing design: The inner and outer covers ensure airtightness through rubber sealing rings and bolts to avoid interference from the external environment.

[0058] Environmental controllability: Through modules such as the deformable part, liquid storage cavity, and rotary closing structure, accurately adjust the air pressure, temperature, and mist concentration to achieve multi-scenario simulation.

[0059] Efficient heat dissipation and atomization: Utilize the condensation cycle and extrusion rotary piece structure to improve the cooling efficiency and mist uniformity, and ensure the accuracy of the test.

[0060] Through multi-environment simulation, this working method solves the problem of the single scenario of traditional test platforms and provides comprehensive technical support for the performance evaluation of drone propellers in complex environments.

[0061] The embodiments disclosed in the present invention are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not depart from the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. An unmanned aerial vehicle propeller lift test platform, characterized in that, It includes a test base, a fixing plate is installed at the center of the top of the test base, a pressure test module is installed at the center of the bottom of the fixing plate, a driving motor is arranged below the fixing plate, the driving end of the driving motor is connected with a sleeve, the sleeve is limited and slidably sleeved with a limiting rod, a pressing ball contacting the fixing plate is fixed on the outer periphery of the bottom end of the limiting rod, and a test propeller is installed at the top end of the limiting rod; An inner and outer cover body is installed on the top of the test base. The inner and outer cover body is composed of an outer cover and an inner cover. A liquid storage cavity is arranged between the outer cover and the inner cover. Water liquid is stored inside the liquid storage cavity. The inner cover includes a deformable part, and the deformable part is made of a deformable material that changes the internal space volume. For the deformable part, a plurality of liquid inlet heads are installed at the top position of the inner cover, a liquid delivery part is installed above the liquid inlet heads, a liquid storage cylinder is arranged at the bottom of the liquid inlet head, and the inside of the liquid storage cylinder is in a low-vacuum environment that reduces the boiling point of the water liquid. A closing structure is arranged in the lower half of the liquid storage cylinder.

2. The lift test platform for a drone propeller according to claim 1, characterized in that The outer cover is made of a hard material, and the top part of the outer cover is transparent glass for observing the inside. The inner cover includes a hard connection part, the hard connection part is connected with the deformable part, and a transparent glass part is fixed at the top of the deformable part.

3. The drone propeller lift test platform according to claim 2, wherein, The liquid delivery part includes a connecting rod, the connecting rod is fixed to the inner top wall of the outer cover, the bottom of the connecting rod is connected with a plurality of connecting sleeves that fit the inner wall of the liquid inlet head, a sealing rubber ring is bonded to the outer periphery of the connecting sleeve, and a water storage space for storing the corresponding amount of water liquid is arranged between the plurality of connecting sleeves.

4. The lift test platform for an unmanned aerial vehicle propeller according to claim 3, characterized in that, The liquid storage cylinder includes a positioning ring, a negative pressure air port communicated with an external air extraction device is connected to the top of the positioning ring, a bottom plate is arranged below the positioning ring, an extension connecting rod is fixed between the bottom plate and the positioning ring, and a plurality of fixed arc baffles are fixed at the bottom edge part of the positioning ring.

5. A drone propeller lift test platform according to claim 4, characterized in that, The closing structure includes a closing piece sunken into the top of the bottom plate. A rotating motor is installed at the center of the bottom of the closing piece. A plurality of closing arc baffles are fixed to the outer periphery of the top of the closing piece. The plurality of closing arc baffles and the fixed arc baffles form a closed ring body, and a sealing rubber layer is bonded to the contact part between the closing arc baffles and the fixed arc baffles.

6. The drone propeller lift test platform according to claim 5, wherein, A plurality of drainage grooves are formed in the inner wall of the liquid inlet head, and the drainage grooves are communicated with the positioning ring.

7. The lift test platform for an unmanned aerial vehicle propeller according to claim 6, characterized in that, A rotating shaft is arranged at the center of the top of the closing piece. A plurality of first extrusion rotating pieces are fixed to the outer periphery of the rotating shaft. A round head is arranged at the center of the inner periphery of the positioning ring. An intermediate connecting rod is connected between the round head and the positioning ring. A one-way shaft sleeve is rotatably connected to the outer periphery of the round head. A plurality of second extrusion rotating pieces are connected to the outer periphery of the one-way shaft sleeve. A honeycomb film made of a soft material is bonded between the plurality of second extrusion rotating pieces and the first extrusion rotating pieces.

8. A drone propeller lift test platform according to claim 7, characterized in that, A heating plate is arranged at the center of the closing piece. A heating wire is installed in the heating plate in a serpentine bending manner. A heat exchange and condensation plate is fixed to the inner bottom wall of the positioning ring. A plurality of liquid inlet ports are formed in the heat exchange and condensation plate, and a plurality of external heat exchange connecting rods are connected to the outer edge of the heat exchange and condensation plate.

9. The drone propeller lift test platform according to claim 8, characterized in that, The first extrusion rotating piece and the second extrusion rotating piece are in a wavy fan-shaped structure, and an elastic rubber body is wound and tightened between the top edge of the closing piece and the bottom edge of the positioning ring.

10. The working method of a lift test platform for a drone propeller according to any one of claims 1-9, characterized in that, It includes the following steps: S1. Install the propeller at the top of the limit rod, start the driving motor to make it rotate, measure the lift data through the pressure test module and display it; S2. Heat the deformable part to expand the space inside the inner cover and reduce the air density; Auxiliary hydraulic rods control the sealing performance, simulate the plateau low-pressure environment, and test the lift under the plateau low-pressure environment; S3. Extract air to reduce the air pressure in the liquid storage cylinder, and at the same time expand the space inside the inner cover to further reduce the pressure; S4. Heat the water liquid in the liquid storage cylinder to make it boil into mist, the mist condenses and dissipates heat to cool down, and the whole process is sealed to maintain low pressure, and the lift is tested in a two-factor environment; S5. Heat the water liquid in the liquid storage cylinder into mist, and evenly discharge it into the inner cover through the rotary closing structure and the extrusion rotary blade to simulate the actual scenario and realize the lift test in the mist environment.

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