A wind tunnel balance loading device

Abstract

This invention discloses a wind tunnel balance loading device, comprising a platform, a loading body mounted on the lower end of the platform, two strip-shaped openings on the loading body, a rectangular block slidably connected within each of the two openings, a sliding rod slidably connected through each of the two rectangular blocks, and a weight rod fixedly connected to the lower end of each of the two sliding rods. The loading body is equipped with a longitudinal adjustment assembly, which includes two slide rails disposed on the upper end of the loading body, a slider slidably connected to each of the two slide rails, and a placement plate fixedly connected to the upper end of each of the two sliders. The two placement plates are fixedly connected to the upper end of the corresponding rectangular blocks. This wind tunnel balance loading device, through a unique double-gear rack and pinion transmission and pneumatic control structure, achieves flexible and precise adjustment of the weight rod height and lever arm; coupled with an automated weight-dropping assembly, it can quickly construct various different weight difference conditions on the left and right sides of the loading body.

Description

Technical Field

[0001] This invention relates to the field of wind tunnel testing technology, and in particular to a wind tunnel balance loading device. Background Technology

[0002] In aerospace, automotive engineering, and other fields, wind tunnel testing is a crucial method for studying the aerodynamic properties of objects. The wind tunnel balance, as a core measuring device in wind tunnel testing, is used to accurately measure the aerodynamic forces acting on a model under airflow; its measurement accuracy directly affects the reliability of the test results. The wind tunnel balance loading device is an important supporting device for calibrating and testing the balance, ensuring the accuracy of the balance measurement data by simulating loads under different operating conditions.

[0003] Existing wind tunnel balance loading devices have several limitations in use. Regarding the adjustment of the weight rod height and lever arm, traditional devices often employ manual adjustment or a single mechanical transmission structure. This is not only cumbersome and inefficient, but also makes it difficult to achieve independent and precise adjustment of the height and lever arm, failing to meet the diverse needs of complex experimental conditions. In terms of weight replacement, manual addition or removal of weights is often required. This method not only increases the workload of operators but also easily introduces human error, and it cannot achieve continuous and automatic changes in weight, making it difficult to simulate dynamically changing load conditions in actual working environments.

[0004] Therefore, a wind tunnel balance loading device needs to be designed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a wind tunnel balance loading device. This wind tunnel balance loading device achieves flexible and precise adjustment of the weight rod height and lever arm through a unique double gear rack transmission and pneumatic control structure. Combined with an automated weight pushing and dropping component, it can quickly construct various working conditions with different weight differences on the left and right sides of the loading body.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A wind tunnel balance loading device includes a platform with a loading body mounted on its lower end. The loading body has two strip-shaped openings, each containing a rectangular block. A sliding rod is slidably connected through each rectangular block, and a weight rod is fixedly connected to the lower end of each sliding rod. The loading body has a longitudinal adjustment assembly, which includes two slide rails on the upper end of the loading body. A slider is slidably connected to each slide rail, and a placement plate is fixedly connected to the upper end of each slider. The placement plates are fixedly connected to the upper ends of the corresponding rectangular blocks.

[0008] Preferably, the upper end of the loading body is provided with two lateral adjustment components. The lateral adjustment components include a second gear set on a rotating rod. The rear side of the loading body is provided with a lateral rack plate that cooperates with the second gear. The rear side of the loading body is fixedly connected with two second adjustment boxes. The inner bottom of the second adjustment box is fixedly connected with multiple second pneumatic rods. The telescopic ends of the multiple second pneumatic rods are fixedly connected to the lower end of the lateral rack plate.

[0009] Preferably, a first adjusting box is fixedly connected to the upper end of each of the two sliding rods, a first pneumatic rod is fixedly connected to the inner wall of each of the two opposing sides of the first adjusting box, a connecting block is fixedly connected to the telescopic end of each of the two first pneumatic rods, and the two connecting blocks are fixedly connected to the upper end of the corresponding longitudinal rack plate.

[0010] Preferably, an inclinometer is placed at the upper end of the platform, a conical hole is provided on the loading body, a balance body is provided on the front side of the loading body, the cone of the balance body passes through the conical hole, a support rod is fixedly connected to the rear side of the balance body, a threaded layer is provided on the rear side of the balance body, and a threaded sleeve is threadedly connected to the threaded layer.

[0011] Preferably, it further includes a weight pushing assembly, which includes a fixed block fixedly connected to the lower end of the left sliding rod, a rectangular box fixedly connected to the right side of the fixed block, a movable block slidably connected inside the rectangular box, a pushing groove provided on the left side of the movable block, an electromagnet fixedly connected to the inner wall of the right side of the pushing groove, a rectangular plate slidably connected inside the pushing groove, two push rods fixedly connected to the left side of the rectangular plate, the adjacent sides of the rectangular plate and the electromagnet are elastically connected by springs, and a pressure sensor is fixedly connected to the inner wall of the left side of the strip-shaped opening on the left side.

[0012] Preferably, the upper end of the movable block is fixedly connected to the inner top of the rectangular box with a folded airbag, the rectangular plate is slidably connected to the inner wall of the push groove, the right side space of the push groove is connected to the outside through an air inlet pipe, the right side space of the push groove is connected to the folded airbag through an air outlet pipe, both the air inlet pipe and the air outlet pipe are equipped with one-way valves, the folded airbag is equipped with an exhaust pipe, and the exhaust pipe is equipped with a valve.

[0013] Preferably, the lower end of the platform is provided with a controller, the pressure sensor, the controller and the electromagnet are electrically connected in sequence, and a time delay relay is connected in series between the controller and the electromagnet. The right side of the rectangular plate is provided with a magnetic sheet adapted to the magnetic pole of the electromagnet.

[0014] Preferably, a friction-enhancing structure is provided between the outer surface of the sliding rod and the inner surface of the rectangular block. The friction-enhancing structure includes: the outer surface of the sliding rod is roughened by micro-arc oxidation treatment, and the surface microstructure of the roughened layer is honeycomb-shaped protrusions; an elastic friction pad is embedded in the inner surface of the rectangular block, and the elastic friction pad is made of nitrile rubber; the inner surface of the elastic friction pad is provided with anti-slip textures distributed along the axial direction of the sliding rod, and the anti-slip textures are continuous serrations.

[0015] The present invention has the following beneficial effects:

[0016] 1. Compared with existing technologies, through the unique longitudinal and lateral adjustment components, and by utilizing the cooperation of slide rails, sliders, drive motors, gears and racks, the height and lever arm of the weight rod can be adjusted independently, flexibly and precisely, avoiding the problems of low efficiency and poor accuracy of traditional manual or single transmission structure adjustment, and can quickly adapt to the diverse needs of complex test conditions.

[0017] 2. Compared with the existing technology, by setting the first pneumatic rod and the second pneumatic rod, not only can the longitudinal height and lateral lever arm of the weight rod be adjusted simultaneously, but also the longitudinal height or lateral lever arm of the weight rod can be adjusted separately, which greatly improves the applicability of the device.

[0018] 3. Compared with the existing technology, the weight pushing component can automatically push down the weights on the weight rod and adjust their positions in sequence through the coordinated work of the pressure sensor, electromagnet, push rod and folding airbag after the adjustment and detection are completed. This realizes the continuous and automatic change of the weight of the weight, without the need for manual operation, which reduces the workload of the operator, eliminates human error, and more realistically simulates the dynamic load conditions in actual working conditions.

[0019] 4. Compared with the existing technology, the friction enhancement structure set between the sliding rod and the rectangular block effectively solves the problem that the weight rod is prone to displacement due to gravity or vibration after adjustment in the existing device, ensuring stable fixation after adjustment and significantly improving loading accuracy and test stability.

[0020] In summary, this invention effectively overcomes the shortcomings of existing wind tunnel balance loading devices, and significantly improves in terms of adjustment accuracy, automation, stability, and testing efficiency. It has outstanding substantive features and significant progress, and is of great significance to the development of wind tunnel testing technology. Attached Figure Description

[0021] Figure 1 External view of the wind tunnel balance loading system;

[0022] Figure 2 This is a schematic diagram of the structure of a wind tunnel balance loading device proposed in this invention;

[0023] Figure 3 This is a schematic diagram of the structure of a wind tunnel balance loading device proposed in this invention from another perspective;

[0024] Figure 4 for Figure 2 Enlarged structural diagram at point A;

[0025] Figure 5 A schematic diagram of the structure of the weight-driven component;

[0026] Figure 6 for Figure 5 A half-section view.

[0027] In the diagram: 1 Platform, 2 Inclinometer, 3 Loading body, 4 Balance body, 5 Support rod, 6 Strip opening, 7 Slide rail, 8 Placement plate, 9 Slider, 10 Rectangular block, 11 Pressure sensor, 12 Drive motor, 13 Rotating rod, 14 First gear, 15 Second gear, 16 Sliding rod, 17 Fixed block, 18 Weight rod, 19 Rectangular box, 20 First adjustment box, 21 First pneumatic rod, 22 Connecting block, 23 Longitudinal rack plate, 24 Second adjustment box, 25 Second pneumatic rod, 26 Moving block, 27 Push rod, 28 Folding airbag, 29 Air outlet pipe, 30 Air inlet pipe, 31 Electromagnet, 32 Rectangular plate, 33 Spring, 34 Threaded sleeve, 35 Transverse rack plate. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0029] Reference Figures 1-6A wind tunnel balance loading device is installed within a wind tunnel balance loading system. The device includes a platform 1, with a loading body 3 mounted at the lower end of the platform 1. The loading body 3 has two strip-shaped openings 6, each containing a rectangular block 10. A sliding rod 16 is slidably connected through each rectangular block 10. This through-sliding connection between the sliding rod 16 and the rectangular block 10, combined with a longitudinal rack plate 23 and other structures, allows for precise adjustment of the height of the weight rod 18. Furthermore, the sliding of the sliding rod 16 within the rectangular block 10 is aided by a friction-enhancing structure, ensuring stable fixation after adjustment. Each sliding rod 16 has a fixed weight rod 18 at its lower end. The weight rod 18 is used to suspend weights. By changing the number of weights, in the initial state, the number and weight of weights on each weight rod 18 are the same, and they are neatly stacked on the weight rod 18. Different loads can be applied to the balance body 4 to simulate various stress conditions in wind tunnel tests. The loading body 3 is equipped with a longitudinal adjustment component, which includes two slide rails 7 set at the upper end of the loading body 3. Each slide rail 7 has a slider 9 slidably connected to it. Each slider 9 has a fixed placement plate 8 at its upper end. The slider 9 cooperates with the slide rail 7. This allows the placement plate 8 to move laterally, thereby changing the position of the weight rod 18 in the horizontal direction and achieving the function of lever arm adjustment. The two placement plates 8 are fixedly connected to the upper ends of the corresponding rectangular blocks 10. A drive motor 12 is installed on the upper end of each of the two placement plates 8. A rotating rod 13 is fixedly connected to the end of the output shaft of each of the two drive motors 12. A first gear 14 is fixedly connected to each of the two rotating rods 13. When the first pneumatic rod 21 is stretched, the first gear 14 meshes with the longitudinal rack plate 23. Through the gear and rack transmission principle, the rotational motion of the rotating rod 13 is converted into the linear motion of the sliding rod 16. The sliding rods 16 are moved to adjust the height of the weight rod 18. Each of the two sliding rods 16 has a longitudinal rack plate 23 on its adjacent side. The upper end of each of the two sliding rods 16 is fixedly connected to a first adjustment box 20. The inner walls of the opposite sides of the two first adjustment boxes 20 are fixedly connected to a first pneumatic rod 21. The first pneumatic rod 21 controls the engagement and disengagement of the longitudinal rack plate 23 and the first gear 14 through telescopic movement, thereby realizing the start and stop control of the weight rod 18 height adjustment. The telescopic ends of the two first pneumatic rods 21 are fixedly connected to a connecting block 22. The two connecting blocks 22 are fixedly connected to the upper end of the corresponding longitudinal rack plate 23.

[0030] The upper end of the loading body 3 is equipped with two lateral adjustment components. The lateral adjustment components cooperate with the longitudinal adjustment components to adjust the position of the weight rod 18 in the horizontal and vertical directions, providing diverse loading conditions for wind tunnel tests. The lateral adjustment components include a second gear 15 set on the rotating rod 13. The rear side of the loading body 3 is equipped with a lateral rack plate 35 that cooperates with the second gear 15. The second gear 15 cooperates with the lateral rack plate 35, and through gear and rack transmission, the rotational motion of the rotating rod 13 is converted into linear motion in the lateral direction, thereby realizing the adjustment of the lever arm of the weight rod 18. Two second adjustment boxes 24 are fixedly connected to the rear side of the loading body 3. Multiple second pneumatic rods 25 are fixedly connected to the bottom of the inner side of the second adjustment box 24. The second pneumatic rods 25 control the engagement and disengagement of the lateral rack plate 35 and the second gear 15 through telescopic movement, realizing the start and stop control of the lever arm adjustment of the weight rod 18. The setting of multiple pneumatic rods can provide more stable support and force. The telescopic ends of the multiple second pneumatic rods 25 are fixedly connected to the lower end of the lateral rack plate 35.

[0031] The platform 1 is equipped with an inclinometer 2, which is used to monitor the horizontal state of the platform 1 in real time to ensure that the entire loading device is in a horizontal position, thereby ensuring the accuracy of the wind tunnel balance measurement data and avoiding measurement errors caused by device tilting. The loading body 3 is provided with a conical hole, and the balance body 4 is provided on the front side of the loading body 3. The cone of the balance body 4 passes through the conical hole. The rear side of the balance body 4 is fixedly connected with a support rod 5, which is used to support the balance body 4, increase the stability of the balance body 4, prevent it from shaking or displacing during loading, and ensure the accuracy of the measurement results. The rear side of the balance body 4 is provided with a threaded layer, and a threaded sleeve 34 is threadedly connected to the threaded layer.

[0032] The system also includes a weight-pushing assembly, which comprises a fixed block 17 fixedly connected to the lower end of the left sliding rod 16. A rectangular box 19 is fixedly connected to the right side of the fixed block 17. A movable block 26 is slidably connected inside the rectangular box 19. A pushing groove is provided on the left side of the movable block 26. An electromagnet 31 is fixedly connected to the inner wall of the right side of the pushing groove. A rectangular plate 32 is slidably connected inside the pushing groove. The electromagnet 31 generates magnetic changes when energized and de-energized. When the electromagnet 31 is energized, it repels the rectangular plate 32, causing the rectangular plate 32 to move to the left. When the electromagnet 31 is de-energized, it moves to the left. Under the elastic action of spring 33, rectangular plate 32 will move back, realizing the automatic push-down of the weight. Two push rods 27 are fixedly connected to the left side of rectangular plate 32. The adjacent side of rectangular plate 32 and electromagnet 31 are elastically connected by spring 33. A pressure sensor 11 is fixedly connected to the left inner wall of the strip opening 6 on the left side. The pressure sensor 11 is used to detect the pressure generated when the mounting bracket of the motor is reset, convert the pressure signal into an electrical signal, trigger the action of electromagnet 31, and realize the trigger control of automatic push-down of the weight. The upper end of moving block 26 is connected to the rectangular box. A folding airbag 28 is fixedly connected to the inner top of the 19. A rectangular plate 32 is slidably connected to the inner wall of the push groove. The right side space of the push groove is connected to the outside through an air inlet pipe 30. The right side space of the push groove is connected to the folding airbag 28 through an air outlet pipe 29. Both the air inlet pipe 30 and the air outlet pipe 29 are equipped with one-way valves. Outside gas enters the push groove unidirectionally through the air inlet pipe 30, and gas in the push groove enters the folding airbag 28 unidirectionally through the air outlet pipe 29. The folding airbag 28 is equipped with an exhaust pipe, and the exhaust pipe is equipped with a valve. The exhaust pipe and valve are used for... When the folding airbag 28 is not needed, the gas inside is released to restore it to its initial state for easy operation. The lower end of the platform 1 is equipped with a controller. The pressure sensor 11, the controller, and the electromagnet 31 are electrically connected in sequence, and a time delay relay is connected in series between the controller and the electromagnet 31. The right side of the rectangular plate 32 is equipped with a magnetic sheet that matches the magnetic pole of the electromagnet 31. The time delay relay is used to control the energizing time of the electromagnet 31 to ensure that the electromagnet 31 only operates after the mounting base of the motor is fully reset, thus avoiding misoperation and ensuring the accuracy of the weight pushing process.

[0033] The sliding rod 16 has a friction-enhancing structure between its outer surface and the inner surface of the rectangular block 10. This structure effectively solves the problem of displacement of the sliding rod 16 due to gravity or external vibration after adjustment, ensuring the stability of the weight rod 18's position and thus improving loading accuracy and test reliability. The friction-enhancing structure includes: a roughened layer formed by micro-arc oxidation treatment on the outer surface of the sliding rod 16, with a honeycomb-like microstructure; an elastic friction plate embedded in the inner surface of the rectangular block 10, which, through its elastic deformation, better conforms to the surface of the sliding rod 16, increasing the contact area and thus increasing friction and improving the fixing effect; the elastic friction plate is made of nitrile rubber; and anti-slip patterns distributed along the axial direction of the sliding rod 16 on the inner surface of the elastic friction plate, which are continuous serrated. These serrated patterns provide more effective resistance when the sliding rod 16 is subjected to external force, enhancing the fixing effect and ensuring the stability of the device during operation.

[0034] The functional principle of this invention can be explained through the following operation: When the height of the weight rod 18 needs to be adjusted, the first pneumatic rod 21 is activated, extending to push the connecting block 22, which in turn moves the longitudinal rack plate 23 upward until it meshes with the first gear 14. At this time, the drive motor 12 is energized and operates, and the output shaft drives the rotating rod 13 to rotate, thereby causing the first gear 14 to rotate. Through the meshing transmission with the longitudinal rack plate 23, the sliding rod 16 is driven to slide up and down axially within the rectangular block 10, thus adjusting the height of the weight rod 18. After adjusting to the target height, the first pneumatic rod 21 is retracted, the longitudinal rack plate 23 disengages from the first gear 14, and the friction-enhancing structure on the outer surface of the sliding rod 16 acts tightly against the inner surface of the rectangular block 10, firmly locking the weight rod 18 at the current height.

[0035] To change the lever arm between the weight lever 18 and the balance, activate the second pneumatic rod 25, which pushes the transverse rack plate 35 upward to engage with the second gear 15. Drive motor 12 operates, and the rotating rod 13 drives the second gear 15 to rotate. With the second gear 15 engaged with the transverse rack plate 35, the placement plate 8 slides laterally along the slide rail 7 via the slider 9, thereby changing the lateral position of the weight lever 18 and achieving lever arm adjustment. After adjustment, the second pneumatic rod 25 retracts, the transverse rack plate 35 separates from the second gear 15, and the entire lateral adjustment assembly remains stable thanks to the cooperation of the slide rail 7 and the slider 9.

[0036] When it is necessary to adjust both the height and lever arm of the weight rod 18 simultaneously, the first pneumatic rod 21 and the second pneumatic rod 25 are activated synchronously. The first pneumatic rod 21 pushes the longitudinal rack plate 23 to mesh with the first gear 14, and the second pneumatic rod 25 pushes the transverse rack plate 35 to mesh with the second gear 15. The drive motor 12 is turned on, and the rotating rod 13 simultaneously drives the first gear 14 and the second gear 15 to rotate. The meshing of the first gear 14 with the longitudinal rack plate 23 drives the sliding rod 16 to move up and down within the rectangular block 10, thereby changing the height of the weight rod 18; the meshing of the second gear 15 with the transverse rack plate 35 drives the placement plate 8 to slide laterally along the slide rail 7 via the slider 9, thereby adjusting the lever arm of the weight rod 18. During the adjustment process, the speed and direction of the drive motor 12 can be adjusted by the control system according to actual needs to precisely control the adjustment amount of the height and lever arm. After adjustment, the first pneumatic rod 21 and the second pneumatic rod 25 are simultaneously controlled to retract, so that the longitudinal rack plate 23 is disengaged from the first gear 14 and the transverse rack plate 35 is disengaged from the second gear 15. Relying on the friction enhancement structure between the sliding rod 16 and the rectangular block 10 and the cooperation between the slide rail 7 and the slider 9, the weight rod 18 is stably fixed at the target position.

[0037] Before each test, place the same number and weight of weights on the two weight rods 18. After the weights are placed, align the two push rods 27 with the topmost weight.

[0038] After each height or lever arm adjustment test is completed, the motor mounting base resets, pressing the pressure sensor 11 against the inner wall of the strip opening 6. The pressure sensor 11 generates an electrical signal that is transmitted to the controller. After a time delay relay is set, the electromagnet 31 is energized. The electromagnet 31 generates magnetic attraction to the rectangular plate 32, compressing the spring 33, causing the push rod 27 to extend out of the rectangular box 19 and push down the top weight on the weight rod 18. After the electromagnet 31 is de-energized, the spring 33 resets and pushes the rectangular plate 32. During the reset process of the rectangular plate 32, the gas in the slot is pushed into the folded airbag 28 through the air outlet pipe 29. The folded airbag 28 expands and pushes the moving block 26 down, aligning the push rod 27 with the next weight, thus achieving automatic adjustment of the weight of the weight. This changes the weight difference between the two weight rods 18, providing different loading conditions for wind tunnel testing.

[0039] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A wind tunnel balance loading device, comprising a platform (1), characterized in that: The platform (1) is equipped with a loading body (3) at its lower end. The loading body (3) has two strip-shaped openings (6). A rectangular block (10) is slidably connected in each of the two strip-shaped openings (6). A sliding rod (16) is slidably connected through each of the two rectangular blocks (10). A weight rod (18) is fixedly connected to the lower end of each of the two sliding rods (16). The loading body (3) is equipped with a longitudinal adjustment component. The longitudinal adjustment component includes two slide rails (7) set at the upper end of the loading body (3). Slider (9) is slidably connected to each rail (7). Placement plate (8) is fixedly connected to the upper end of each of the two sliders (9). Placement plate (8) is fixedly connected to the upper end of the corresponding rectangular block (10). Drive motor (12) is installed on the upper end of each of the two placement plates (8). Rotating rod (13) is fixedly connected to the output shaft end of each of the two drive motors (12). First gear (14) is fixedly connected to each of the two rotating rods (13). Longitudinal rack plate (23) is provided on the adjacent sides of each of the two sliding rods (16). The upper end of the loading body (3) is provided with two lateral adjustment components. The lateral adjustment components include a second gear (15) set on the rotating rod (13). The rear side of the loading body (3) is provided with a lateral rack plate (35) that cooperates with the second gear (15). The rear side of the loading body (3) is fixedly connected with two second adjustment boxes (24). The inner bottom of the second adjustment box (24) is fixedly connected with multiple second pneumatic rods (25). The telescopic ends of the multiple second pneumatic rods (25) are fixedly connected to the lower end of the lateral rack plate (35). The upper ends of the two sliding rods (16) are fixedly connected to the first adjustment box (20), the inner walls of the opposite sides of the two first adjustment boxes (20) are fixedly connected to the first pneumatic rod (21), the telescopic ends of the two first pneumatic rods (21) are fixedly connected to the connecting block (22), and the two connecting blocks (22) are fixedly connected to the upper ends of the corresponding longitudinal rack plate (23). An inclinometer (2) is placed on the upper end of the platform (1). A conical hole is provided on the loading body (3). A balance body (4) is provided on the front side of the loading body (3). The cone of the balance body (4) passes through the conical hole. A support rod (5) is fixedly connected to the rear side of the balance body (4). A threaded layer is provided on the rear side of the balance body (4). A threaded sleeve (34) is threadedly connected to the threaded layer.

2. The wind tunnel balance loading device according to claim 1, characterized in that: It also includes a weight pushing assembly, which includes a fixed block (17) fixedly connected to the lower end of the left sliding rod (16). A rectangular box (19) is fixedly connected to the right side of the fixed block (17). A moving block (26) is slidably connected inside the rectangular box (19). A pushing groove is provided on the left side of the moving block (26). An electromagnet (31) is fixedly connected to the inner wall of the right side of the pushing groove. A rectangular plate (32) is slidably connected inside the pushing groove. Two push rods (27) are fixedly connected to the left side of the rectangular plate (32). The adjacent sides of the rectangular plate (32) and the electromagnet (31) are elastically connected by a spring (33). A pressure sensor (11) is fixedly connected to the inner wall of the strip opening (6) on the left side.

3. The wind tunnel balance loading device according to claim 2, characterized in that: The upper end of the movable block (26) and the inner top of the rectangular box (19) are fixedly connected to a folded airbag (28). The rectangular plate (32) is slidably connected to the inner wall of the push groove. The right side space of the push groove is connected to the outside through an air inlet pipe (30). The right side space of the push groove is connected to the folded airbag (28) through an air outlet pipe (29). Both the air inlet pipe (30) and the air outlet pipe (29) are equipped with one-way valves. The folded airbag (28) is equipped with an exhaust pipe, and the exhaust pipe is equipped with a valve.

4. The wind tunnel balance loading device according to claim 2, characterized in that: The platform (1) is equipped with a controller at its lower end. The pressure sensor (11), the controller and the electromagnet (31) are electrically connected in sequence. A time delay relay is connected in series between the controller and the electromagnet. The right side of the rectangular plate (32) is equipped with a magnetic sheet that is compatible with the magnetic pole of the electromagnet (31).

5. The wind tunnel balance loading device according to claim 1, characterized in that: A friction enhancement structure is provided between the outer surface of the sliding rod (16) and the inner surface of the rectangular block (10). The friction enhancement structure includes: the outer surface of the sliding rod (16) is subjected to micro-arc oxidation treatment to form a rough layer, and the surface microstructure of the rough layer is honeycomb-shaped protrusions; an elastic friction pad is embedded in the inner surface of the rectangular block (10), and the elastic friction pad is made of nitrile rubber; the inner surface of the elastic friction pad is provided with anti-slip textures distributed along the axial direction of the sliding rod (16), and the anti-slip textures are continuous sawtooth shapes.

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