Wind tunnel balance loading device

Abstract

A wind tunnel balance loading device disclosed by the present invention comprises a platform, the lower end of the platform is provided with a loading main body, the loading main body is provided with two strip-shaped openings, rectangular blocks are slidably connected in the two strip-shaped openings, and sliding rods are slidably connected to the two rectangular blocks in a penetrating manner. The lower ends of the two sliding rods are both fixedly connected with weight rods, the loading main body is provided with a longitudinal adjusting assembly, the longitudinal adjusting assembly comprises two sliding rails arranged at the upper end of the loading main body, the two sliding rails are both slidably connected with sliding blocks, the upper ends of the two sliding blocks are both fixedly connected with placing plates, and the placing plates are fixedly connected with the loading main body. And the two placing plates are fixedly connected with the upper ends of the corresponding rectangular blocks. According to the wind tunnel balance loading device, through a unique double-gear rack transmission and pneumatic control structure, flexible and accurate adjustment of the height of the weight rod and the force arm is realized; and an automatic weight push-off assembly is matched, so that various different weight difference working conditions can be quickly constructed on the left and right sides of the loading main body.

Description

Technical Field

[0001] The invention relates to the technical field of wind tunnel testing, in particular to a wind tunnel balance loading device. Background Art

[0002] In fields such as aerospace and automotive engineering, wind tunnel testing is a key method for studying the aerodynamic properties of objects. As a core measurement device in wind tunnel testing, the wind tunnel balance is used to accurately measure the aerodynamic forces acting on a model under the influence of airflow. Its measurement accuracy directly affects the reliability of the test results. The wind tunnel balance loading device is a crucial accessory for calibrating and testing the balance. By simulating loads under different operating conditions, it ensures the accuracy of the balance's measurement data.

[0003] Existing wind tunnel balance loading devices have many limitations during use. When adjusting the height and lever arm of the weight rod, traditional devices mostly use manual adjustment or a single mechanical transmission structure. This is not only cumbersome and inefficient, but also difficult to achieve independent and precise adjustment of the height and lever arm, and cannot meet the diverse needs of complex test conditions. Weight replacement operations often rely on manual addition or removal of weights, which not only increases the workload of operators but is also prone to human error. Furthermore, it is impossible to achieve continuous and automatic changes in the weight of the weight, making it difficult to simulate the dynamically changing load conditions in actual working conditions.

[0004] Therefore, it is necessary to design a wind tunnel balance loading device to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the existing technology and propose a wind tunnel balance loading device. The wind tunnel balance loading device realizes flexible and precise adjustment of the weight rod height and lever arm through a unique dual-gear rack transmission and pneumatic control structure; combined with an automated weight push-down assembly, it can quickly construct a variety of different weight difference working conditions on the left and right sides of the loading body.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A wind tunnel balance loading device comprises a platform, a loading body is installed at the lower end of the platform, two strip openings are provided on the loading body, rectangular blocks are slidably connected in the two strip openings, sliding rods are slidably connected through the two rectangular blocks, and the lower ends of the two sliding rods are fixedly connected to weight rods, and a longitudinal adjustment component is provided on the loading body, and the longitudinal adjustment component comprises two slide rails arranged at the upper end of the loading body, sliders are slidably connected on the two slide rails, and the upper ends of the two sliders are fixedly connected to a placement plate, and the two placement plates are fixedly connected to the upper ends of the corresponding rectangular blocks.

[0007] Preferably, two lateral adjustment components are provided at the upper end of the loading body, and the lateral adjustment components include a second gear arranged on the rotating rod, and a lateral rack plate cooperating with the second gear is provided on the rear side of the loading body. Two second adjustment boxes are fixedly connected to the rear side of the loading body, and a plurality of second pneumatic rods are fixedly connected to the inner bottom of the second adjustment box, and the telescopic ends of the plurality of second pneumatic rods are fixedly connected to the lower end of the lateral rack plate.

[0008] Preferably, the upper ends of the two sliding rods are fixedly connected to the first adjustment box, the inner walls on the opposite sides of the two first adjustment boxes are fixedly connected to the first pneumatic rod, the telescopic ends of the two first pneumatic rods are fixedly connected to the connecting blocks, and the two connecting blocks are fixedly connected to the upper ends of the corresponding longitudinal rack plates.

[0009] Preferably, an inclinometer is placed on 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.

[0010] Preferably, it also 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 moving block slidably connected in the rectangular box, a pushing groove provided on the left side of the moving block, an electromagnet fixedly connected to the right inner wall of the pushing groove, a rectangular plate slidably connected in 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 a spring, and a pressure sensor is fixedly connected to the left inner wall of the strip opening on the left side.

[0011] Preferably, the upper end of the moving block and the inner top of the rectangular box are fixedly connected with a folding airbag, the rectangular plate is sealed and slidably connected to the inner wall of the push groove, the right side space of the push groove is connected with the outside world through an air inlet pipe, and the right side space of the push groove is connected with the folding airbag through an air outlet pipe, the air inlet pipe and the air outlet pipe are both provided with a one-way valve, the folding airbag is provided with an exhaust pipe, and the exhaust pipe is provided with a valve.

[0012] Preferably, a controller is provided at the lower end of the platform, the pressure sensor, controller and electromagnet are electrically connected in sequence, and a delay relay is connected in series between the controller and the electromagnet, and a magnetic conductive sheet adapted to the magnetic pole of the electromagnet is provided on the right side of the rectangular plate.

[0013] Preferably, a friction enhancing structure is provided between the outer surface of the sliding rod and the inner surface of the rectangular block, and the friction enhancing structure includes: the outer surface of the sliding rod is treated with micro-arc oxidation to form a rough layer, and the surface microstructure of the rough layer is a honeycomb-shaped protrusion; the inner surface of the rectangular block is inlaid with an elastic friction plate, and the elastic friction plate is made of nitrile rubber; the inner surface of the elastic friction plate is provided with anti-slip grooves distributed along the axial direction of the sliding rod, and the anti-slip grooves are continuous serrated.

[0014] The present invention has the following beneficial effects: 1. Compared with existing technologies, the unique longitudinal adjustment assembly and transverse adjustment assembly, using the cooperation of slide rails, sliders, drive motors, gears and rack plates, achieves independent, flexible and precise adjustment of the weight rod height and lever arm, avoiding the low efficiency and poor precision of traditional manual or single transmission structure adjustment, and can quickly adapt to the diverse needs of complex test conditions; 2. Compared with the prior art, the arrangement of the first pneumatic rod and the second pneumatic rod not only allows the longitudinal height and transverse lever arm of the weight rod to be adjusted synchronously, but also allows the longitudinal height or transverse lever arm of the weight rod to be adjusted separately, which greatly improves the applicability of the device; 3. Compared with the existing technology, the weight pushing assembly is set up. After the adjustment and detection are completed, the weights on the weight rod can be automatically pushed down and adjusted in sequence through the coordinated work of the pressure sensor, electromagnet, push rod and folding airbag, so as to achieve continuous and automatic change of the weight of the weight. No manual operation is required, which reduces the workload of the operator, eliminates human errors, and more realistically simulates the dynamic load changes in actual working conditions. 4. Compared with the existing technology, a friction enhancement structure is set between the sliding rod and the rectangular block, which effectively solves the problem that the weight rod is easily displaced due to gravity or vibration after adjustment in the existing device, ensures stable fixation after adjustment, and significantly improves the loading accuracy and test stability.

[0015] In summary, the present invention effectively overcomes the defects of existing wind tunnel balance loading devices, and has significantly improved adjustment accuracy, degree of automation, stability and test efficiency. It has outstanding substantive characteristics and significant progress, and is of great significance to the development of wind tunnel test technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 External diagram of the loading system for the wind tunnel balance; Figure 2 This is a structural schematic diagram of a wind tunnel balance loading device proposed by the present invention; Figure 3 This is a structural schematic diagram of a wind tunnel balance loading device proposed by the present invention from another perspective; Figure 4 for Figure 2 Schematic diagram of the enlarged structure at A in the middle; Figure 5 It is a structural diagram of the weight pushing component; Figure 6 for Figure 5 Half-section view.

[0017] In the figure: 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 outlet pipe, 30 inlet pipe, 31 electromagnet, 32 rectangular plate, 33 spring, 34 threaded sleeve, 35 transverse rack plate. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0019] Reference Figures 1-6A wind tunnel balance loading device is installed in a wind tunnel balance loading system, including a platform 1, a loading body 3 is installed at the lower end of the platform 1, and two strip openings 6 are provided on the loading body 3, and rectangular blocks 10 are slidably connected in the two strip openings 6. Sliding rods 16 are slidably connected to the two rectangular blocks 10. The sliding connection between the sliding rods 16 and the rectangular blocks 10, in conjunction with the longitudinal rack plate 23 and other structures, can achieve precise adjustment of the height of the weight rod 18, and the sliding of the sliding rod 16 in the rectangular block 10 is affected by the friction enhancement structure, and can be stably fixed after adjustment. The lower ends of the sliding rods 16 are fixedly connected with weight rods 18, which are 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 rods 18. Different loads can be applied to the balance body 4 to simulate various stress conditions in the wind tunnel test. The loading body 3 is provided with a longitudinal adjustment component, which includes two slide rails 7 arranged at the upper end of the loading body 3. The two slide rails 7 are slidably connected to sliders 9. The upper ends of the two sliders 9 are fixedly connected to a placement plate 8. The sliders 9 cooperate with the slide rails 7. The placing plate 8 is able to move in the lateral direction, thereby driving the weight rod 18 to change its position in the horizontal direction, realizing the function of adjusting the force arm. The two placing plates 8 are fixedly connected to the upper ends of the corresponding rectangular blocks 10. The upper ends of the two placing plates 8 are both equipped with drive motors 12. The ends of the output shafts of the two drive motors 12 are both fixedly connected to the rotating rods 13. The two rotating rods 13 are both fixedly connected to the first gear 14. When the first pneumatic rod 21 is stretched, the first gear 14 and the longitudinal rack plate 23 are meshed with each other. Through the gear rack transmission principle, the rotational motion of the rotating rod 13 is converted into the linear motion of the sliding rod 16. The two sliding rods 16 are respectively provided with longitudinal rack plates 23 on adjacent sides, and the upper ends of the two sliding rods 16 are respectively fixedly connected with the first adjusting box 20, and the inner walls of the opposite sides of the two first adjusting boxes 20 are respectively fixedly connected with the first pneumatic rod 21, and the first pneumatic rod 21 controls the engagement and disengagement of the longitudinal rack plate 23 with the first gear 14 through telescopic movement, thereby realizing the start and stop control of the height adjustment of the weight rod 18, and the telescopic ends of the two first pneumatic rods 21 are respectively fixedly connected with the connecting blocks 22, and the two connecting blocks 22 are respectively fixedly connected with the upper ends of the corresponding longitudinal rack plates 23.

[0020] Among them, two lateral adjustment components are provided at the upper end of the loading body 3, and the lateral adjustment components cooperate with the longitudinal adjustment components to realize the position adjustment of the weight rod 18 in the horizontal and vertical directions, providing diverse loading conditions for wind tunnel tests. The lateral adjustment component includes a second gear 15 arranged on the rotating rod 13, and a lateral rack plate 35 cooperating with the second gear 15 is provided on the rear side of the loading body 3. The second gear 15 cooperates with the lateral rack plate 35, and through the gear 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 force arm of the weight rod 18. Two second adjustment boxes 24 are fixedly connected to the rear side of the loading body 3, and the inner bottom of the second adjustment box 24 is fixedly connected with multiple second pneumatic rods 25. The second pneumatic rod 25 controls the engagement and disengagement of the lateral rack plate 35 with the second gear 15 through telescopic movement, thereby realizing the start and stop control of the force 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.

[0021] Among them, an inclinometer 2 is placed on the upper end of the platform 1. The inclinometer 2 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 the tilt of the device. A conical hole is provided on the loading body 3, and 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. The support rod 5 is used to support the balance body 4, increase the stability of the balance body 4, prevent it from shaking or displacing during the loading process, and ensure the accuracy of the measurement results. A threaded layer is provided on the rear side of the balance body 4, and a threaded sleeve 34 is threadedly connected to the threaded layer.

[0022] Among them, it also includes a weight pushing component, which includes a fixed block 17 fixedly connected to the lower end of the left sliding rod 16, a rectangular box 19 fixedly connected to the right side of the fixed block 17, a moving block 26 slidably connected in 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 right inner wall of the pushing groove, a rectangular plate 32 is slidably connected in the pushing groove, the electromagnet 31 produces a magnetic change by powering on and off, when the electromagnet 31 is energized, the rectangular plate 32 is repelled, causing the rectangular plate 32 to move left, and when the electromagnet 31 is de-energized, the rectangular plate 32 is repelled. Under the elastic action of the spring 33, the rectangular plate 32 will move back, realizing the automatic pushing down of the weight. The left side of the rectangular plate 32 is fixedly connected to two push rods 27. The adjacent side of the rectangular plate 32 and the electromagnet 31 are elastically connected by the spring 33. The left inner wall of the strip opening 6 on the left is fixedly connected with a pressure sensor 11. The pressure sensor 11 is used to detect the pressure generated when the mounting seat of the motor is reset, and converts the pressure signal into an electrical signal to trigger the action of the electromagnet 31 to realize the trigger control of automatically pushing down the weight. The upper end of the moving block 26 is connected to the rectangular box The inner top of 19 is fixedly connected with a folding airbag 28, and the rectangular plate 32 is sealed and slidably connected to the inner wall of the pushing groove. The right side space of the pushing groove is connected with the outside through the air inlet pipe 30, and the right side space of the pushing groove is connected with the folding airbag 28 through the air outlet pipe 29. Both the air inlet pipe 30 and the air outlet pipe 29 are provided with a one-way valve. The outside gas enters the pushing groove in one direction through the air inlet pipe 30, and the gas in the pushing groove enters the folding airbag 28 in one direction through the air outlet pipe 29. The folding airbag 28 is provided with an exhaust pipe, and the exhaust pipe is provided with a valve. The exhaust pipe and the valve are used to When the folding airbag 28 is no longer needed, the gas therein is discharged to restore it to its initial state, so as to facilitate the next operation. A controller is provided at the lower end of the platform 1. The pressure sensor 11, the controller and the electromagnet 31 are electrically connected in sequence, and a delay relay is connected in series between the controller and the electromagnet 31. A magnetic conductive sheet that is adapted to the magnetic pole of the electromagnet 31 is provided on the right side of the rectangular plate 32. The delay relay is used to control the power-on time of the electromagnet 31 to ensure that the electromagnet 31 will act again after the mounting base for installing the motor is completely reset, thereby avoiding misoperation and ensuring the accuracy of the weight pushing process.

[0023] Among them, 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 setting of the friction enhancement structure effectively solves the problem of displacement of the sliding rod 16 due to gravity or external vibration after adjustment, ensures the stability of the position of the weight rod 18, thereby improving the loading accuracy and test reliability. The friction enhancement structure includes: the outer surface of the sliding rod 16 is treated with micro-arc oxidation to form a rough layer, and the surface microstructure of the rough layer is honeycomb-shaped protrusions; the inner surface of the rectangular block 10 is inlaid with an elastic friction plate, and the elastic friction plate utilizes its elastic deformation to better fit the surface of the sliding rod 16, increase the contact area, thereby increasing the friction force and improving the fixing effect. The elastic friction plate is made of nitrile rubber; the inner surface of the elastic friction plate is provided with anti-slip grooves distributed along the axial direction of the sliding rod 16, and the anti-slip grooves are continuous serrated. The serrated anti-slip grooves can provide more effective resistance when the sliding rod 16 is subjected to external force, enhance the fixing effect, and ensure the stability of the device during operation.

[0024] The functional principle of the present 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, causing it to extend and push the connecting block 22, driving the longitudinal rack plate 23 to move upward until it engages with the first gear 14. At this time, the drive motor 12 is powered on, and the output shaft drives the rotating rod 13 to rotate, thereby rotating the first gear 14. 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 to adjust the height of the weight rod 18. After adjusting to the target height, the first pneumatic rod 21 is controlled to retract, and the longitudinal rack plate 23 is disengaged from the first gear 14. The friction-enhancing structure on the outer surface of the sliding rod 16 closely interacts with the inner surface of the rectangular block 10, firmly locking the weight rod 18 at the current height. To change the moment arm between the weight rod 18 and the balance, the second pneumatic rod 25 is activated, pushing the transverse rack plate 35 upward to engage the second gear 15. The drive motor 12 operates, and the rotating rod 13 rotates the second gear 15. 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 rod 18 and adjusting the moment arm. Once adjusted, the second pneumatic rod 25 retracts, separating the transverse rack plate 35 from the second gear 15. The entire transverse adjustment assembly remains stable thanks to the cooperation between the slide rail 7 and the slider 9. When it is necessary to adjust the height and the lever arm of the weight rod 18 at the same time, the first pneumatic rod 21 and the second pneumatic rod 25 are started synchronously. The first pneumatic rod 21 pushes the longitudinal rack plate 23 to engage with the first gear 14, and the second pneumatic rod 25 pushes the transverse rack plate 35 to engage with the second gear 15. Turn on the drive motor 12, and the rotating rod 13 drives the first gear 14 and the second gear 15 to rotate at the same time. The engagement of the first gear 14 with the longitudinal rack plate 23 drives the sliding rod 16 to move up and down in the rectangular block 10, thereby changing the height of the weight rod 18; the engagement of the second gear 15 with the transverse rack plate 35 drives the placement plate 8 to slide horizontally along the slide rail 7 through 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 through the control system according to actual needs to accurately control the adjustment amount of the height and lever arm. After the adjustment is completed, the first pneumatic rod 21 and the second pneumatic rod 25 are controlled to retract at the same time, so that the longitudinal rack plate 23 and the first gear 14, and the transverse rack plate 35 and the second gear 15 are disengaged, and the weight rod 18 is stably fixed in the target position by 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.

[0025] Before each test, weights of the same number and weight are placed on the two weight rods 18. After the weights are placed, the two push rods 27 are aligned with the weight located at the top.

[0026] After each height or arm adjustment test is completed, the mounting base of the motor is reset, squeezing the pressure sensor 11 on the inner wall of the strip opening 6. The pressure sensor 11 generates an electrical signal and transmits it to the controller. After the time set by the delay relay, the electromagnet 31 is triggered to energize. 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 powered off, the spring 33 resets and pushes the rectangular plate 32. During the reset process of the rectangular plate 32, the gas in the groove is pushed into the folding airbag 28 through the outlet pipe 29. The folding airbag 28 expands and pushes the moving block 26 downward, so that the push rod 27 is aligned with the next weight, realizing automatic adjustment of the weight of the weight, thereby changing the weight difference between the two weight rods 18 and providing different loading conditions for wind tunnel testing.

[0027] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A wind tunnel balance loading device, comprising a platform (1), characterized in that: The lower end of the platform (1) is provided with a loading body (3), and the loading body (3) is provided with two strip openings (6), and rectangular blocks (10) are slidably connected in the two strip openings (6), and sliding rods (16) are slidably connected through the two rectangular blocks (10), and the lower ends of the two sliding rods (16) are fixedly connected to weight rods (18), and the loading body (3) is provided with a longitudinal adjustment component, which includes two slide rails (7) arranged at the upper end of the loading body (3), and the two slide rails (7) are fixedly connected to the lower end of the loading body (3). The rail (7) is slidably connected to a slider (9), the upper ends of the two sliders (9) are fixedly connected to a placement plate (8), the two placement plates (8) are fixedly connected to the upper ends of the corresponding rectangular blocks (10), the upper ends of the two placement plates (8) are installed with a driving motor (12), the output shaft ends of the two driving motors (12) are fixedly connected to a rotating rod (13), the two rotating rods (13) are fixedly connected to a first gear (14), and the adjacent sides of the two sliding rods (16) are provided with a longitudinal rack plate (23).

2. A wind tunnel balance loading device according to claim 1, characterized in that: The upper end of the loading body (3) is provided with two lateral adjustment components, and the lateral adjustment components include a second gear (15) arranged on the rotating rod (13). The rear side of the loading body (3) is provided with a lateral rack plate (35) that matches the second gear (15). The rear side of the loading body (3) is fixedly connected to two second adjustment boxes (24). The inner bottom of the second adjustment box (24) is fixedly connected to a plurality of second pneumatic rods (25), and the telescopic ends of the plurality of second pneumatic rods (25) are fixedly connected to the lower end of the lateral rack plate (35).

3. The wind tunnel balance loading device according to claim 1, characterized in that: The upper ends of the two sliding rods (16) are fixedly connected to the first adjustment box (20), the inner walls of the two first adjustment boxes (20) on opposite sides 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 blocks (22), and the two connecting blocks (22) are fixedly connected to the upper ends of the corresponding longitudinal rack plates (23).

4. A wind tunnel balance loading device according to claim 3, characterized in that: An inclinometer (2) is placed on the upper end of the platform (1), a tapered hole is provided on the loading body (3), a balance body (4) is provided on the front side of the loading body (3), a cone of the balance body (4) passes through the tapered 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), and a threaded sleeve (34) is threadedly connected to the threaded layer.

5. The wind tunnel balance loading device according to claim 1, characterized in that: The weight pushing assembly further 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 moving block (26) is slidably connected in 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 right inner wall of the pushing groove; a rectangular plate (32) is slidably connected in 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); and a pressure sensor (11) is fixedly connected to the left inner wall of the strip-shaped opening (6) on the left side.

6. A wind tunnel balance loading device according to claim 5, characterized in that: The upper end of the moving block (26) and the inner top of the rectangular box (19) are fixedly connected to a folding airbag (28), the rectangular plate (32) is sealingly and slidingly connected to the inner wall of the pushing groove, the right side space of the pushing groove is connected to the outside world through an air inlet pipe (30), and the right side space of the pushing 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 provided with a one-way valve, the folding airbag (28) is provided with an exhaust pipe, and the exhaust pipe is provided with a valve.

7. The wind tunnel balance loading device according to claim 5, characterized in that: A controller is provided at the lower end of the platform (1), and 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). A magnetic conductive sheet adapted to the magnetic pole of the electromagnet (31) is provided on the right side of the rectangular plate (32).

8. 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), and the friction enhancement structure comprises: 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; the inner surface of the rectangular block (10) is inlaid with an elastic friction plate, and the elastic friction plate is made of nitrile rubber; the inner surface of the elastic friction plate is provided with anti-skid patterns distributed along the axial direction of the sliding rod (16), and the anti-skid patterns are continuous serrated.

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