Maximum load ratio microbalance calibration device

Abstract

The invention provides a maximum load ratio microbalance calibration device which comprises a base, a supporting rod, four Y-direction load loading devices, four Z-direction load loading devices, a balance, a loading frame and an X-direction load loading device, the two ends of the supporting rod are connected with the base and the balance respectively, and the open end of the balance is inserted into the loading frame and connected with the end, away from the balance, of the loading frame; the four Y-direction load loading devices are connected to the bottom of the loading frame, symmetrically arranged on the two sides of the balance in pairs and used for conducting Y-direction loading on the loading frame. The four Z-direction load loading devices are symmetrically arranged in pairs relative to the loading frame and are used for carrying out Z-direction loading on the loading frame; the X-direction load loading device and the balance are coaxially arranged, and Z-direction and X-direction loads are applied to the loading frame through magnetic force. The implementation mode can reduce the labor intensity, improve the production efficiency, realize the measurement of the impact load of the balance, improve the application precision of each component load, and meet the calibration requirement of the balance with the maximum load ratio.

Description

Technical Field

[0001] The invention relates to the technical field of wind tunnel balance calibration, in particular to a very large load ratio microbalance calibration device. Background Art

[0002] Wind tunnel testing is a forerunner of aircraft model development. It is one of the most reliable means to verify the quality of aerodynamic design solutions and predict the aerodynamic performance of aircraft. The performance of the wind tunnel test balance is one of the most important key links in wind tunnel testing. At present, there are more and more wind tunnel force tests on high lift / drag ratio (high lift / side ratio) shapes and small asymmetric shapes represented by reentry warheads. The load characteristics of this type of layout cause the load components to be extremely mismatched. For example, the ratio of lift to lateral force, the ratio of drag to rolling moment, etc.

[0003] Ground calibration is one of the key factors that determine the measurement performance of a balance. During ground calibration, factors such as heavy loading devices and inaccurate application of loads on each component bring great difficulties to the calibration of extremely large load ratio microbalances. At present, traditional balance calibration devices and methods are mainly used for the calibration of such balances in the following two methods:

[0004] (1) After measuring the longitudinal force Y of the balance, the balance is flipped 90° and then loaded in the lateral direction Z. In this loading method, the weight of the loading frame even exceeds the Z vector range of the balance or introduces a large measurement error, and it is impossible to load six components simultaneously.

[0005] (2) Use a pulley reversing device to convert the weight of the loaded weight into the horizontal force of the balance. In this method, the friction between the mixing wheel and the wire group is not small for a microbalance with extremely large loads, which seriously affects the calibration accuracy of the lateral force of the balance. Summary of the invention

[0006] The content of the present invention is used to introduce the concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of the present disclosure is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0007] Some embodiments of the present invention provide a very large load ratio microbalance calibration device to solve the technical problems mentioned in the above background technology section.

[0008] The extremely large load ratio microbalance calibration device comprises a base, a support rod, four Y-direction load loading devices, four Z-direction load loading devices, a balance, a loading frame and an X-direction load loading device, wherein:

[0009] The two ends of the support rod are respectively connected to the base and the balance, and the open end of the balance is inserted into the loading frame and connected to the end of the loading frame away from the balance;

[0010] Four Y-axis load-loading devices are connected to the bottom of the loading frame and are symmetrically arranged in pairs on both sides of the balance for applying Y-axis loading to the loading frame;

[0011] Four Z-direction load-applying devices are symmetrically arranged in pairs relative to the loading frame, and are used to apply Z-direction loading to the loading frame;

[0012] The X-direction load loading device is coaxially arranged with the balance, and applies Z-direction and X-direction loads to the loading frame through magnetic force.

[0013] Optionally, the loading frame includes a main loading frame connected to the balance, four magnetic receiving blocks symmetrically mounted to the main loading frame in pairs, and another magnetic receiving block mounted to a side of the main loading frame away from the balance.

[0014] Optionally, four Y-direction load loading devices are respectively arranged at the left rear, left front, right front and right rear positions of the balance center O; four Z-direction load loading devices are respectively arranged at the left rear, left front, right front and right rear positions of the balance center O, and force is applied to the balance along the Z direction under the action of electromagnetic force, wherein the four magnetic receiving blocks are arranged in a one-to-one correspondence with the four Z-direction load loading devices.

[0015] Optionally, the X-axis load loading device, the magnetic receiving block installed on the side of the main loading frame away from the balance, and the balance are coaxially arranged.

[0016] Optionally, the X-direction load loading device and the Z-direction load loading device are magnetic loading devices, and the magnetic loading device includes a coil, a ring body, a screw, a support arm and a bolt;

[0017] The coil is wound around the inner core of the annular body, the annular body is detachably mounted on the top of the support arm, and the support arm is fixed to the base by bolts;

[0018] When the coil is energized, it generates magnetic force, which acts on the balance through the loading frame.

[0019] Optionally, the material of the annular body of the magnetic receiving block corresponding to the X-direction load applying device can be replaced according to the load range.

[0020] Optionally, the X-axis load applying device can be powered off to measure the impact load on the balance.

[0021] Optionally, the relationship between the current and the applied force is determined based on the magnetic receiving block and the annular body installed on the main loading frame on the side away from the balance, so as to apply a corresponding load to the balance by adjusting the current.

[0022] Optionally, four Y-axis load loading devices include a recess, a top, a connecting block and a weight plate, wherein the recess and the weight plate are respectively installed at both ends of the connecting block, the top is installed on the main loading frame, and the top is placed in the recess, and the two are in contact connection; when applying load, weights are placed on the weight plate, and Y-axis loading is achieved by relying on gravity.

[0023] Optionally, in the XOZ plane, the arm of the Z-direction load loading device from the balance center O in the X direction is l; the arm of the Y-direction load loading device from the balance center O in the X direction is m; and the arm of the Y-direction load loading device from the balance center O in the Z direction is n;

[0024] During the Y-axis load application process, weights of G are loaded on the four Y-axis load loading devices. 1 , G 2 , G 3 , G 4 , then the corresponding load applied to the balance is:

[0025] Force F y =(G 1 +G 2 +G 3 +G 4 );

[0026] M z =(G 2 +G 4 -G 1 -G 3 )*m;

[0027] M x =(G 3 +G 4 -G 1 -G 2 )*n;

[0028] Among them, F y is the force on the balance in the Y direction;

[0029] M z is the Z-direction moment of the balance;

[0030] M x is the X-torque of the balance.

[0031] During the X-axis load application process, the X-axis load loading device is energized to generate a corresponding magnetic force of F 5 , then the corresponding load applied to the balance is:

[0032] F x =F 5 ;

[0033] Among them, F xis the force on the balance in the X direction.

[0034] During the Z-direction load application process, the four Z-direction load loading devices are energized, and the forces generated are F 1 、F 3 , F, F 4 , then the corresponding load applied to the balance is:

[0035] F z =(F 1 +F 2 -F 3 -F 4 );

[0036] M y =(F 1 +F 4 -F 2 -F 3 )*l;

[0037] Among them, F x is the force on the balance in the X direction;

[0038] M y is the Y-torque of the balance.

[0039] The above embodiments of the present invention have the following beneficial effects:

[0040] First, the present invention can realize a large range of loading in the Y direction and a small range of loading in the lateral force direction, eliminating the problems of the weight of the loading frame and the design constraints and error sources introduced by the traditional "pulley-type" load switching.

[0041] Secondly, the present invention can determine the relationship between the current and the applied force, and can achieve the application of the corresponding load to the balance by adjusting the current, which can greatly reduce the balance calibration time and reduce the labor intensity.

[0042] Third, the present invention can realize single-component calibration and six-component combined calibration, with convenient loading and high calibration efficiency.

[0043] Fourthly, the present invention can realize the measurement of the impact load of the balance by cutting off the power supply to the X-axis load loading device. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1It is a structural schematic diagram of an embodiment of a very large load ratio microbalance calibration device of the present invention;

[0046] Figure 2 A cross-sectional view of an embodiment of a high-load ratio microbalance calibration device of the present invention;

[0047] Figure 3 A schematic diagram of an embodiment of a Y-axis load applying device of the present invention;

[0048] Figure 4 is a cross-sectional view of an embodiment of a magnetic loading device of the present invention;

[0049] Figure 5 It is a top view of an embodiment of the magnetic loading device of the present invention. DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0052] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0054] First, please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of an embodiment of a calibration device for a microbalance with a large load ratio according to the present invention. As Figure 1 shown, the calibration device for a microbalance with a large load ratio includes a base 1, a support rod 2, four Y-direction load loading devices, four Z-direction load loading devices, a balance 5, a loading frame, and an X-direction load loading device 7.

[0055] One end of the support rod 2 connected to the base 1 is attached with a key for determining the relative position with the base 1, and the two are tightened by a nut. The right end of the support rod 2 (the direction in Figure 1 ) and the left end of the balance 5 (the direction in Figure 1 ) are tightened by a wedge. The right end of the balance 5 (the direction in Figure 1 ) is connected to the loading frame 6 by a bolt.

[0056] Please refer to Figure 2 and continue to refer to Figure 1 , Figure 2 , which is a cross-sectional view of an embodiment of a calibration device for a microbalance with a large load ratio according to the present invention. As Figure 2 shown, the loading frame includes a main loading frame 601 arranged in a "C" shape and five magnetic force receiving blocks 602, 603, 604, 605, and 606. The loading frame 6 is horizontally sleeved on the balance 5. The main loading frame 601 includes two X-direction connecting rods arranged in parallel and a Z-direction connecting rod connected to the right ends of the two X-direction connecting rods (the direction in Figure 2 ). The right end of the balance 5 is connected to the two X-direction connecting rods by bolts. It should be noted that the above X-direction is the left-right direction in Figure 2 , the Z-direction is the up-down direction in Figure 2 , and the Y-direction is the vertical direction.

[0057] The X-direction load loading device 7 is fixed on the base 1 by bolts and is coaxially arranged with the balance 5. When energized, it applies an X-direction load to the balance. The above X-direction load loading device 7 is arranged on the right side of the Z-direction connecting rod. A magnetic force receiving block 602 is fixedly provided in the middle of the Z-direction connecting rod by a bolt, and this magnetic force receiving block 602 is coaxially arranged with the balance 5.

[0058] Magnetic force receiving blocks 603 and 604 are provided on the upper X-direction connecting rod. Magnetic force receiving blocks 605 and 606 are correspondingly provided on the lower X-direction connecting rod. That is, the magnetic force receiving blocks 603, 604, 605, and 606 are respectively located at the upper left, upper right, lower left, and lower right positions of the calibration center O (the position in Figure 2direction in the middle).

[0059] The outer side of the upper X-axis connecting rod is provided with a Z-axis load loading device 401 and a Z-axis load loading device 402, which correspond to the magnetic receiving block 603 and the magnetic receiving block 604 respectively. The outer side of the lower X-axis connecting rod is provided with a Z-axis load loading device 403 and a Z-axis load loading device 404, which correspond to the magnetic receiving block 605 and the magnetic receiving block 606 respectively. Therefore, the Z-axis load loading device 401, the Z-axis load loading device 402, the Z-axis load loading device 403 and the Z-axis load loading device 404 are also located at the upper left, upper right, lower left and lower right positions of the centering O ( Figure 2 direction in the middle).

[0060] Continue reading Figure 1 and Figure 2 Each X-axis connecting rod has a connecting hole with a size corresponding to the top of the Y-axis load loading device processed at the bottom. The Y-axis load loading devices 301 and 302 are inserted into the connecting holes of the upper X-axis connecting rod; the Y-axis load loading devices 303 and 304 are inserted into the connecting holes of the lower X-axis connecting rod, thereby achieving connection with the loading frame.

[0061] See next Figure 3 , Figure 3 FIG. 2 is a schematic diagram of an embodiment of a Y-axis load loading device of the present invention. Figure 3 As shown, each Y-axis load loading device includes: a recess 3001, a top 3002, a connecting block 3003 and a weight plate 3004. The top 3002 is inserted into the connecting hole of the main loading frame 601, and the recess 3001 is placed on the top 3002, and the two are in point contact. The connecting block 3003 is connected to the recess 3001 and the weight plate 3004 by threaded connection; the weight plate 3004 is used to place the loading weight.

[0062] See also Figure 4 and Figure 5 , Figure 4 is a cross-sectional view of an embodiment of a magnetic loading device of the present invention; Figure 5 FIG. 1 is a top view of an embodiment of the magnetic loading device of the present invention. Figure 4 and Figure 5 As shown, the X-direction load loading device 7 and the four Z-direction load loading devices are all magnetic force loading devices, including a coil 4001, a ring body 4002, a screw 4003, an arm 4004 and a bolt 4005. The coil 4001 is wound around the inner core of the ring body 4002 and connected to the arm 4004. The arm 4004 is fixed to the base 1 by bolts. When the coil is energized, it generates magnetic force, which acts on the balance through the loading frame.

[0063] Under the condition of fixing the distance between the magnetic receiving block 602 and the annular body 4002, the current values ​​corresponding to different loads are determined, and the load force on the balance can be achieved by adjusting the corresponding current values.

[0064] In addition, the material of the annular body 4002 of the magnetic receiving block 601 can be matched and replaced according to the application requirements of different load ranges.

[0065] When the X-axis load applying device 7 is powered off, the axial force acting on the balance disappears suddenly, which can be used to measure the impact load of the balance.

[0066] like Figure 2 As shown, in the XOZ plane, the arm of each Z-direction load loading device along the X direction from the balance center O is l. The arm of each Y-direction load loading device along the X direction from the balance center O is m, and the arm of each Y-direction load loading device along the Z direction from the balance center O is n. The above arm units can be millimeters.

[0067] During the Y-direction load application process, weights are loaded on the Y-direction load loading device 301, the Y-direction load loading device 302, the Y-direction load loading device 303 and the Y-direction load loading device 304, respectively, with weights of G respectively. 1 , G 2 , G 3 , G 4 , then the corresponding load applied to the balance 5 is:

[0068] F y =(G 1 +G 2 +G 3 +G 4 );

[0069] M z =(G 2 +G 4 -G 1 -G 3 )*m;

[0070] M x =(G 3 +G 4 -G 1 -G 2 )*n.

[0071] Among them, F y is the force on the balance 5 in the Y direction;

[0072] M z is the Z-direction moment of the balance 5;

[0073] M x is the X-direction moment of the balance 5.

[0074] During the X-direction load application process, the X-direction load applying device 7 is energized to generate a corresponding magnetic force F 5 , then the corresponding load applied to the balance is:

[0075] F x =F 5 .

[0076] Among them, F x is the force on the balance 5 in the X direction.

[0077] During the Z-direction load application process, the Z-direction load loading device 401, the Z-direction load loading device 402, the Z-direction load loading device 403 and the Z-direction load loading device 404 are energized respectively, and the forces generated are F and 1 、F 2 、F 3 、F 4 , then the corresponding load applied to the balance is:

[0078] F z =(F 1 +F 2 -F 3 -F 4 );

[0079] M y =(F 1 +F 4 -F 2 -F 3 )*l.

[0080] Among them, F x is the force on the balance 5 in the X direction;

[0081] M y is the Y-direction moment of the balance 5.

[0082] The device in the embodiment of the present invention is simple and easy to operate, which can greatly reduce the balance calibration time and reduce the labor intensity.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 high-load ratio microbalance calibration device, characterized in that: It includes a base, a support rod, four Y-direction load loading devices, four Z-direction load loading devices, a balance, a loading frame and an X-direction load loading device, wherein: The two ends of the support rod are respectively connected to the base and the balance, and the open end of the balance is inserted into the loading frame and connected to the end of the loading frame away from the balance; Four Y-axis load-loading devices are connected to the bottom of the loading frame and are symmetrically arranged in pairs on both sides of the balance for applying Y-axis loading to the loading frame; Four Z-direction load-applying devices are symmetrically arranged in pairs relative to the loading frame, and are used to apply Z-direction loading to the loading frame; The X-direction load loading device is coaxially arranged with the balance, and applies Z-direction and X-direction loads to the loading frame through magnetic force.

2. A high-load ratio microbalance calibration device according to claim 1, characterized in that: The loading frame comprises a main loading frame connected to the balance, four magnetic receiving blocks symmetrically mounted to the main loading frame in pairs, and another magnetic receiving block mounted to a side of the main loading frame away from the balance.

3. A high-load ratio microbalance calibration device according to claim 2, characterized in that: The four Y-direction load loading devices are respectively arranged at the left rear, left front, right front and right rear positions of the balance center O; the four Z-direction load loading devices are respectively arranged at the left rear, left front, right front and right rear positions of the balance center O, and apply force to the balance along the Z direction under the action of electromagnetic force, wherein the four magnetic receiving blocks are arranged one-to-one correspondingly to the four Z-direction load loading devices.

4. A high-load ratio microbalance calibration device according to claim 3, characterized in that: The X-axis load loading device, the magnetic receiving block installed on the side of the main loading frame away from the balance, and the balance are coaxially arranged.

5. A high-load ratio microbalance calibration device according to claim 4, characterized in that: The X-direction load loading device and the Z-direction load loading device are magnetic loading devices, and the magnetic loading device includes a coil, a ring body, a screw, a support arm and a bolt; The coil is wound around the inner core of the annular body, the annular body is detachably mounted on the top of the support arm, and the support arm is fixed to the base by bolts; When the coil is energized, it generates magnetic force, which acts on the balance through the loading frame.

6. A high-load ratio microbalance calibration device according to claim 5, characterized in that: The material of the annular body of the magnetic force receiving block corresponding to the X-direction load applying device can be replaced according to the load range.

7. A high-load ratio microbalance calibration device according to claim 6, characterized in that: Cutting off the power supply to the X-axis load loading device can be used to measure the impact load on the balance.

8. The high-load ratio microbalance calibration device according to claim 7, characterized in that: The relationship between the current and the applied force is determined according to the magnetic receiving block and the annular body installed on the main loading frame on the side away from the balance, so as to apply a corresponding load to the balance by adjusting the current.

9. The extremely large load ratio microbalance calibration device according to claim 3, characterized in that: The four Y-axis load loading devices include a recess, a top, a connecting block and a weight plate. The recess and the weight plate are respectively installed at both ends of the connecting block, and the top is installed on the main loading frame. The top is placed in the recess, and the two are in contact connection. When applying load, weights are placed on the weight plate to achieve Y-axis loading by relying on gravity.

10. The high-load ratio microbalance calibration device according to claim 1, characterized in that: In the XOZ plane, the arm of the Z-direction load loading device from the balance center O in the X direction is l; the arm of the Y-direction load loading device from the balance center O in the X direction is m; the arm of the Y-direction load loading device from the balance center O in the Z direction is n; During the Y-axis load application process, weights are loaded on the four Y-axis load loading devices, with weights G1, G2, G3, and G4, respectively. The corresponding loads applied to the balance are: Force F y =(G1+G2+G3+G4); M z =(G2+G4-G1-G3)*m; M x =(G3+G4-G1-G2)*n; Among them, F y is the force on the balance in the Y direction; M z is the Z-direction moment of the balance; M x is the X-torque of the balance. During the X-direction load application process, the X-direction load loading device is energized to generate a corresponding magnetic force of F5. The corresponding load applied to the balance is: F x =F5; Among them, F x is the force on the balance in the X direction. During the Z-direction load application process, the four Z-direction load-applying devices are energized, and the forces generated are F1, F3, F, and F4, respectively. The corresponding loads applied to the balance are: <h2 style=";text-align:left;direction:ltr">F<h2 style=";text-align:left;direction:ltr"> z <h2 style=";text-align:left;direction:ltr"> (F1+F2-F3-F4) M y =(F1+F4-F2-F3)*l; Among them, F x is the force on the balance in the X direction; M y is the Y-torque of the balance.

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