Wind tunnel balance loading reversing device

Abstract

The invention relates to the technical field of wind tunnel balances, in particular to a wind tunnel balance loading reversing device which comprises a first pulley and a second pulley which synchronously rotate around the same center shaft, the radius of the first pulley is larger than that of the second pulley, and the wheel groove face of the first pulley is fixedly connected with a first force transmission assembly. The wheel groove surface of the second pulley is fixedly connected with a second force conduction assembly, a force source is applied to the first force conduction assembly, and the second force conduction assembly is connected with the wind tunnel balance. According to the invention, the magnitude of transmission force can be changed while balance loading and reversing are realized; the first pulley can be replaced by pulleys with different radiuses, so that the proportion of transmission force can be changed, and the force applied by the force source can be applied to the wind tunnel balance through different lever ratios. According to the invention, the application range of the force source is expanded, and the same set of force source can meet the calibration requirements of balances with different load ranges; according to the application of the invention, the cost is saved, and the safety risk of loading is reduced to a certain extent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind tunnel balance, in particular to a loading reversing device in the calibration process of wind tunnel balance. BACKGROUND

[0002] The wind tunnel balance is the core component of the wind tunnel test, which can accurately measure the aerodynamic load of the aircraft. Before its application, it needs to be calibrated by loading to obtain the calibration formula of the corresponding relationship between the balance signal output and the load. At present, during the calibration of the balance, a steel belt is usually used, both ends of which are connected to the balance and the force source system, and the middle passes through the pulley, so as to convert the vertical force applied by the force source system into horizontal force and apply it to the balance. Without considering the influence of friction, the force applied by the force source, the force borne by the steel belt and the force applied to the balance are equal, and the calibration load of the balance cannot exceed the maximum load that can be provided by the force source system. The reversing device of the traditional single pulley can only change the direction of force transmission, but cannot change the size of the force. When calibrating a large load balance, more driving power or more weights are needed, which is not only uneconomical, but also brings greater safety risk.

[0003] In view of the shortcomings of the traditional wind tunnel balance loading reversing device, the present application provides a wind tunnel balance loading reversing device based on the principle of lever, which can change the size of the transmitted force while realizing the reversing, so as to meet the calibration requirements of different load range balances with the same set of force source system. SUMMARY

[0004] The present application aims to provide a wind tunnel balance loading reversing device which can solve the above technical problems.

[0005] The present application provides a wind tunnel balance loading reversing device, which comprises a first pulley and a second pulley rotating synchronously around the same center axis, the radius of the first pulley is greater than that of the second pulley, the wheel groove surface of the first pulley is fixedly connected with a first force transmission component, the wheel groove surface of the second pulley is fixedly connected with a second force transmission component, a force source is applied to the first force transmission component, and the second force transmission component is connected with the wind tunnel balance.

[0006] Preferably, the first force transmission component and the second force transmission component are both steel belts, and the steel belts are respectively a first steel belt connected with the first pulley and a second steel belt connected with the second pulley. The first steel belt and the second steel belt can be replaced by steel wires.

[0007] Preferably, the first steel belt is vertically tangent to the outside of the first pulley, the force source applies a vertical downward force and transmits it to the first pulley through the first steel belt, and the force arm from the rotation center of the first pulley is R.

[0008] Preferably, the second steel belt is horizontally tangent to the outside of the second pulley, and the force vector transmitted is applied to the wind tunnel balance in the horizontal direction, with the force arm from the rotation center of the second pulley being r.

[0009] The force F applied in the vertical direction can be changed into a force F' in the horizontal direction, and the force transmission ratio is R / r, i.e., F' / F=R / r.

[0010] Preferably, the force source applied to the first force transmission assembly is any of the following forms: pneumatic drive, hydraulic drive, or weight loading.

[0011] Preferably, the fixed connection of the first steel belt to the first pulley is achieved by the following method: the end of the first steel belt is rotated around a first cylindrical rod, and then the rotated double-layer steel belt is fixed to the outer edge of the groove surface of the first pulley by a first pressing block.

[0012] Preferably, the fixed connection of the second steel belt to the second pulley is achieved by the following method: the end of the second steel belt is rotated around a second cylindrical rod, and then the rotated double-layer steel belt is fixed to the outer edge of the groove surface of the second pulley by a second pressing block.

[0013] Preferably, the first pressing block or the second pressing block is fixed to the first pulley or the second pulley by a screw.

[0014] Preferably, the radius of curvature of the abutting surface of the first pressing block or the second pressing block is the same as the radius of the connected pulley.

[0015] Preferably, the radius of the first pulley has multiple specifications, and the force transmission ratio can be changed by replacing the first pulley with different radius.

[0016] Advantages: The present application can change the size of the transmitted force while realizing balance loading reversal. The first pulley in the present application can be replaced by a pulley with different radius, so that the force transmission ratio can be changed, and the force applied by the force source can be applied to the wind tunnel balance through different lever ratios. The present application expands the application range of the force source, and the same set of force source can meet the calibration requirements of different load range balances. The application of the present application saves cost and reduces the safety risk of loading to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0018] Figure 1 A schematic diagram of the three-dimensional structure of the present application; Figure 2 A schematic diagram of the tangential fixing of the steel belt and the pulley in the present application; Figure 3 A schematic diagram for showing the force arm in the present application.

[0019] Explanation of reference numerals: 1 first pulley, 2- second pulley, 3- first steel belt, 4- second steel belt, 51- first cylindrical rod, 52- second cylindrical rod, 61- first pressing block, 62- second pressing block. DETAILED DESCRIPTION

[0020] The technical solutions of the present application will be described below in conjunction with the embodiments, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0022] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited. In addition, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] Example 1 A wind tunnel balance loading reversing device, such as Figure 1As shown, the system includes a first pulley 1 and a second pulley 2, a first steel belt 3 and a second steel belt 4, a first cylindrical rod 51 and a second cylindrical rod 52, a first pressure block 61 and a second pressure block 62. The first pulley 1 and the second pulley 2 are coaxially mounted and rotate synchronously. The first pulley 1 is connected to a force source system via the first steel belt 3, which is vertically tangent to the outer side of the first pulley 1. The force applied by the force source system is vertically downward, and this downward force is transmitted through the first steel belt 3. The lever arm from the rotation center of the first pulley 1 is R. The second pulley 2 is connected to a wind tunnel balance via the second steel belt 4, which is horizontally tangent to the outer side of the second pulley 2. The transmitted force is horizontal and applied to the wind tunnel balance. The lever arm from the rotation center of the second pulley 2 is r. The second pulley 2 can be replaced with pulleys of different radii r.

[0024] like Figure 2 As shown, the tangential fixing of the steel belt and the pulley is achieved by a pressure block. Taking the tangential fixing of the first steel belt 3 and the first pulley 1 as an example, the end of the first steel belt 3 passes around the first cylindrical rod 51, ensuring that one end is on the outside. The first pressure block 61 is used to tightly press the double-layer steel belt after rotation onto the outer edge of the first pulley 1, ensuring that the first cylindrical rod 51 cannot pass between the first pulley 1 and the first pressure block 61.

[0025] The first pressure block 61 is fixed to the first pulley 1 by screws, and the radius of curvature of the contact surface with the first pulley 1 is the same as the radius R of the first pulley 1. The second pressure block 62 is fixed to the second pulley 2 by screws, and the radius of curvature of the contact surface with the second pulley 2 is the same as the radius r of the second pulley 2.

[0026] The radius of the first pulley 1 is R=100mm, and the radius of the second pulley 2 is r=50mm. The force F applied by the force source system is vertically downward and is transmitted to the first pulley 1 through the first steel belt 3. Since the first pulley 1 and the second pulley 2 are coaxially installed and rotate synchronously, in order to maintain balance, the second steel belt 4 connected to the second pulley 2 will be subjected to a force F', which satisfies the lever transmission ratio R / r, that is, F' / F=R / r=2. The force F applied by the force source is vertically downward, and the force F' on the wind tunnel balance is in the horizontal direction, thus realizing the simultaneous change of the magnitude and direction of the applied force.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wind tunnel balance loading and reversing device, characterized in that, It includes a first pulley and a second pulley that rotate synchronously around the same central axis. The radius of the first pulley is larger than that of the second pulley. A first force transmission component is fixedly connected to the groove surface of the first pulley, and a second force transmission component is fixedly connected to the groove surface of the second pulley. A force source is applied to the first force transmission component, and the second force transmission component is connected to a wind tunnel balance.

2. The wind tunnel balance loading and reversing device according to claim 1, characterized in that, Both the first force transmission component and the second force transmission component are made of steel belts, which are respectively the first steel belt connected to the first pulley and the second steel belt connected to the second pulley.

3. The wind tunnel balance loading and reversing device according to claim 2, characterized in that, The first steel belt is vertically tangent to the outer side of the first pulley, and the force source applies a vertically downward force, which is transmitted to the first pulley through the first steel belt.

4. The wind tunnel balance loading and reversing device according to claim 2, characterized in that, The second steel belt is horizontally tangent to the outer side of the second pulley, and the transmitted force vector is applied to the wind tunnel balance in the horizontal direction.

5. The wind tunnel balance loading and reversing device according to claim 1, characterized in that, The force source applied to the first force transmission component can be any form of pneumatic drive, hydraulic drive, or weight loading.

6. The wind tunnel balance loading and reversing device according to claim 2, characterized in that, The first steel belt is fixedly connected to the first pulley in the following manner: the end of the first steel belt is rotated around the first cylindrical rod, and then the rotated double-layer steel belt is fixed to the outer edge of the groove surface of the first pulley by the first pressure block.

7. The wind tunnel balance loading and reversing device according to claim 6, characterized in that, The second steel belt is fixedly connected to the second pulley in the following manner: the end of the second steel belt is rotated around the second cylindrical rod, and then the rotated double-layer steel belt is fixed to the outer edge of the groove surface of the second pulley by the second pressure block.

8. The wind tunnel balance loading and reversing device according to claim 7, characterized in that, The first or second pressure block is fixed to the first or second pulley by screws.

9. The wind tunnel balance loading and reversing device according to claim 8, characterized in that, The radius of curvature of the contact surface of the first or second pressure block pressing the first or second steel strip is the same as the radius of the connected pulley.

10. The wind tunnel balance loading and reversing device according to claim 1, characterized in that, The radius of the first pulley is available in various specifications, and the force transmission ratio can be changed by replacing the first pulley with one of different radii.

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