Centroid measurement device

Abstract

The utility model discloses a centroid measuring device, including a measuring platform and a fixed tooling, the measuring platform is provided with a platform bracket and a force sensor; the fixed tooling includes a fixed body and a positioning bracket connected to the fixed body, the positioning bracket is placed on the platform bracket; the positioning bracket includes a first bracket and a second bracket, the platform bracket is provided with a three-way positioning surface, the first bracket is a three-way bracket, the second bracket is a two-way bracket, the three-way positioning surfaces of the first bracket are matched with the three-way positioning surfaces on the corresponding platform bracket, and the two-way positioning surfaces of the second bracket are matched with the two-way positioning surfaces on the corresponding platform bracket. The centroid measuring device of the utility model has high positioning accuracy, simple operation, and small measurement result error.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring devices, in particular to a centroid measuring device. Background Art

[0002] The aircraft's joystick can control the aircraft's flight attitude, allowing the aircraft to perform pitch, roll and other actions. If the actual center of mass position of the aircraft's joystick deviates greatly from the ideal center of mass position, the aircraft will generate a huge inertial force when the speed and direction change rapidly, affecting the pilot's control of the aircraft's attitude at high speed and accuracy.

[0003] The aircraft joystick in the prior art usually uses two methods, theoretical calculation and actual measurement, to determine its center of mass position. For parts with regular shapes, their center of mass positions can be accurately obtained through theoretical calculations, but for parts with complex shapes and involving multiple parts, there will be a certain deviation between the center of mass position obtained by theoretical calculation and the actual center of mass position. After the various parts of the aircraft joystick are assembled, it is necessary to verify the center of mass position, and to determine whether the center of mass position deviation is within the allowable range through inspection. The rod head of the joystick is an irregularly shaped part, and its center of mass is generally obtained by a center of mass measurement method. The center of mass measurement method currently commonly used is a static measurement method, in which the center of mass position is obtained by moment balance measurement and calculation under the condition of uniform distribution of gravity. This method can obtain the center of mass coordinates in two directions at most in one measurement and calculation. In order to obtain the complete center of mass coordinates, the measured target needs to be flipped. The commonly used method is secondary clamping or flipping mechanism, but after flipping, the measurement error will increase and affect the measurement accuracy. Utility Model Content

[0004] In view of this, the utility model provides a centroid measuring device, which has high positioning accuracy, simple operation and small measurement result error.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A centroid measuring device, comprising:

[0007] A measuring platform, wherein a platform bracket and a force sensor are provided on the measuring platform;

[0008] A fixing tool, comprising a fixing body and a positioning bracket connected to the fixing body, wherein the positioning bracket is placed on the platform bracket;

[0009] The positioning bracket includes a first bracket and a second bracket. The platform bracket is provided with a three-way positioning surface. The first bracket is a three-way bracket, and the second bracket is a two-way bracket. The three-way positioning surfaces of the first bracket are matched with the three-way positioning surfaces on the corresponding platform bracket, and the two-way positioning surfaces of the second bracket are matched with the two-way positioning surfaces on the corresponding platform bracket.

[0010] Optionally, the platform bracket is provided with a first X-direction positioning surface, a first Y-direction positioning surface and a first Z-direction positioning surface;

[0011] The first bracket is provided with a second X-direction positioning surface, a second Y-direction positioning surface and a second Z-direction positioning surface, the first X-direction positioning surface of the platform bracket contacts the second X-direction positioning surface, the first Y-direction positioning surface contacts the second Y-direction positioning surface, and the first Z-direction positioning surface contacts the second Z-direction positioning surface;

[0012] The second bracket is provided with a third X-direction positioning surface and a third Z-direction positioning surface. The first X-direction positioning surface of the other platform bracket contacts the third X-direction positioning surface, and the first Z-direction positioning surface contacts the third Z-direction positioning surface.

[0013] Optionally, the fixed body includes a bottom plate, a top plate and a side plate, the side plate is connected between the bottom plate and the top plate, the bottom plate is provided with a measuring piece connecting groove, and the piece to be measured is fixedly connected in the measuring piece connecting groove.

[0014] Optionally, the first bracket is arranged on the outer surface of one of the side panels, and the second bracket is arranged on the outer surface of the other side panel;

[0015] The first bracket and the second bracket are centrally symmetrically arranged about a central position of the fixing body.

[0016] Optionally, a first through hole is provided at the center of the measuring piece connection groove, a second through hole is provided at a position on the top plate corresponding to the first through hole, and the second through hole is coaxially arranged with the first through hole;

[0017] The first through hole and the second through hole have the same aperture.

[0018] Optionally, a third through hole is provided on the side plate, the third through holes on the two side plates are coaxially arranged, and the first bracket or the second bracket is fixedly arranged around the position of the third through hole.

[0019] Optionally, the piece to be measured is bonded in the measuring piece connecting groove.

[0020] Optionally, a fourth through hole is provided at the center of the measuring platform, and the first bracket and the second bracket are respectively provided on both sides of the fourth through hole.

[0021] Optionally, a plurality of the force sensors are provided, and the plurality of force sensors are evenly distributed on the bottom surface of the measuring platform.

[0022] Optionally, the platform bracket is welded to the measuring platform.

[0023] It can be seen from the above technical scheme that the centroid measuring device provided by the utility model realizes the precise positioning of the fixed tooling by the measuring platform by setting a platform bracket and a positioning bracket that are matched with the positioning surfaces, wherein the positioning bracket includes a first bracket and a second bracket, and the positioning surfaces in three directions of the first bracket are matched with the positioning surfaces in three directions on the corresponding platform bracket, and the positioning surfaces in two directions of the second bracket are matched with the positioning surfaces in two directions on the corresponding platform bracket, which not only facilitates the precise placement of the fixed tooling, but also reduces the error caused by the flipping of the fixed tooling due to the limitation of the matched positioning surfaces, thereby obtaining high-precision measurement results, thereby improving the accuracy of the centroid measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of a centroid measuring device provided in an embodiment of the utility model;

[0026] Figure 2 A schematic diagram of the structure of a measurement platform provided by an embodiment of the utility model;

[0027] Figure 3 A schematic structural diagram of an angle of a fixing tool provided in an embodiment of the utility model;

[0028] Figure 4 A schematic structural diagram of the fixing tool provided in an embodiment of the utility model from another angle.

[0029] in:

[0030] 1. Force sensor;

[0031] 2. Measurement platform;

[0032] 201, fourth through hole;

[0033] 3. Platform bracket;

[0034] 301, first Y-direction positioning surface; 302, first X-direction positioning surface; 303, first Z-direction positioning surface; 4, fixing tooling;

[0035] 401, fixed body; 402, first bracket; 4021, second Y-direction positioning surface; 4022, second X-direction positioning surface; 4023, second Z-direction positioning surface; 403, measuring piece connecting groove; 404, first through hole; 405, third through hole; 406, second through hole; 407, second bracket; 4071, third X-direction positioning surface; 4072, third Z-direction positioning surface;

[0036] 5. Parts to be measured. DETAILED DESCRIPTION

[0037] The utility model discloses a centroid measuring device, which has high positioning accuracy, simple operation and small measurement result error.

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] See also Figures 1 to 4 The centroid measuring device of the utility model includes a measuring platform 2 and a fixing tool 4, and the fixing tool 4 is placed on the measuring platform 2. A platform bracket 3 and a force sensor 1 are provided on the measuring platform 2, and the platform bracket 3 is used to support the fixing tool 4, and the fixing tool 4 is used to fix the object to be measured 5, and specifically, the object to be measured 5 can be a rod head. The fixing tool 4 includes a fixing body 401 and a positioning bracket connected to the fixing body 401, and the positioning bracket is placed on the platform bracket 3. The force sensor 1 measures the force on the supporting point of the measuring platform 2, so as to facilitate the calculation of the centroid position by using the moment balance principle.

[0040] In order to achieve reliable support for the fixed tooling 4, the positioning bracket includes a first bracket 402 and a second bracket 407. A three-way positioning surface is provided on the platform bracket 3. The first bracket 402 is a three-way bracket, and the second bracket 407 is a two-way bracket. The three-way positioning surfaces of the first bracket 402 are matched with the three-way positioning surfaces on the corresponding platform bracket 3, and the two-way positioning surfaces of the second bracket 407 are matched with the two-way positioning surfaces on the corresponding platform bracket 3. The three-way positioning surface here refers to the limiting surface for limiting the three vertical directions. The three-way bracket is a bracket for limiting the three vertical directions, and the two-way bracket is a bracket for limiting the two vertical directions. Among them, the platform bracket 3 is welded to the measuring platform 2.

[0041] The centroid measuring device of the utility model realizes accurate positioning of the fixed tool 4 by the measuring platform 2 by setting a platform bracket 3 and a positioning bracket which are matched with the positioning surfaces, wherein the positioning bracket includes a first bracket 402 and a second bracket 407, and the positioning surfaces in three directions of the first bracket 402 are matched with the positioning surfaces in three directions on the corresponding platform bracket 3, and the positioning surfaces in two directions of the second bracket 407 are matched with the positioning surfaces in two directions on the corresponding platform bracket 3, which not only facilitates the accurate placement of the fixed tool 4, but also reduces the error caused by the flipping of the fixed tool 4 due to the limitation of the matched positioning surfaces, thereby obtaining a high-precision measurement result, thereby improving the accuracy of the centroid measurement.

[0042] Specifically, the platform bracket 3 is provided with a first X-direction positioning surface 302, a first Y-direction positioning surface 301 and a first Z-direction positioning surface 303. Figure 2 As shown, the first X-direction positioning surface 302 and the first Y-direction positioning surface 301 are both arranged perpendicular to the measuring platform 2, and the first Z-direction positioning surface 303 is arranged parallel to the measuring platform 2. Correspondingly, the first bracket 402 is provided with a second X-direction positioning surface 4022, a second Y-direction positioning surface 4021 and a second Z-direction positioning surface 4023, as shown in FIG. Figure 3 As shown. The first X-direction positioning surface 302 of a platform bracket 3 contacts the second X-direction positioning surface 4022, the first Y-direction positioning surface 301 contacts the second Y-direction positioning surface 4021, and the first Z-direction positioning surface 303 contacts the second Z-direction positioning surface 4023, thereby realizing reliable positioning of one side of the fixed tooling 4. For ease of installation, the second bracket 407 is provided with a third X-direction positioning surface 4071 and a third Z-direction positioning surface 4072, as shown in FIG. Figure 4 As shown, the first X-direction positioning surface 302 of another platform bracket 3 contacts the third X-direction positioning surface 4071, and the first Z-direction positioning surface 303 contacts the third Z-direction positioning surface 4072. It can be understood that the second bracket 407 is not limited in the Y direction, which reduces the installation difficulty of placing the fixing tool 4 on the platform bracket 3.

[0043] In order to improve the structural strength of the fixed body 401 and facilitate the placement of the object to be measured 5 in the fixed body 401, the fixed body 401 includes a bottom plate, a top plate and side plates. Figure 3 As shown in Fig. 4, the side plate is connected between the bottom plate and the top plate, and only two side plates are provided, and the other two side positions of the fixed body 401 are connected structures. The bottom plate is provided with a measuring piece connection groove 403 for connecting the piece to be measured 5, and the piece to be measured 5 is fixedly connected in the measuring piece connection groove 403. Among them, the first bracket 402 is provided on the outer surface of one of the side plates, and the second bracket 407 is provided on the outer surface of the other side plate. The first bracket 402 and the second bracket 407 are centrally symmetrically provided about the central position of the fixed body 401, and the first bracket 402 and the second bracket 407 are provided at the central position of the side plate, so as to facilitate the acquisition of the center of mass of the fixed body 401 and facilitate the subsequent measurement of the center of mass of the piece to be measured 5.

[0044] In one embodiment, the measuring piece connection groove 403 is a circular groove, and the to-be-measured piece 5 is a rod head, which is bonded in the measuring piece connection groove 403. Specifically, the rod head is bonded to the bottom of the measuring piece connection groove 403 by a circular double-sided adhesive.

[0045] In order to facilitate the installation of the workpiece 5 to be measured, a first through hole 404 is provided at the center of the measuring piece connection groove 403. The first through hole 404 is an avoidance hole, which is convenient for the installation of the end of the workpiece 5 to be measured that is connected to the measuring piece connection groove 403, so as to accommodate the protruding structure of this end of the workpiece 5 to be measured. A second through hole 406 is provided at a position corresponding to the first through hole 404 on the top plate. The second through hole 406 is coaxially arranged with the first through hole 404, and the second through hole 406 has the same aperture as the first through hole 404, so as to avoid the centroid position of the fixing tool 4 from being offset due to the provision of the first through hole 404.

[0046] In order to achieve lightweight fixing tool 4, the side plate is provided with a third through hole 405, the third through holes 405 on the two side plates are coaxially arranged, and the first bracket 402 or the second bracket 407 is fixedly arranged around the third through hole 405. In order to reduce the mass of the measuring platform 2, the center position of the measuring platform 2 is provided with a fourth through hole 201, such as Figure 2 As shown, the first bracket 402 and the second bracket 407 are disposed on both sides of the fourth through hole 201. By reducing the mass of the measuring platform 2 and the fixing fixture 4, the mass of the entire measuring device is reduced, thereby reducing the measurement error caused by the excessive mass of the measuring device itself.

[0047] In order to achieve reliable support for the measuring platform 2, a plurality of force sensors 1 are provided, and the plurality of force sensors 1 are evenly distributed on the bottom surface of the measuring platform 2. In one embodiment, four force sensors 1 are provided. By controlling the relative positions of the four force sensors 1 at the bottom of the measuring platform 2, the influence of the sensor accuracy on the measurement result is reduced.

[0048] The centroid measuring device of the utility model has two functions in which the measuring platform 2 has two functions. One is to perform high-precision positioning on the fixed tool 4. The high-precision positioning function is realized by the platform bracket 3 and the positioning bracket, including positioning in the three directions of X, Y, and Z. When the fixed tool 4 is turned over, high precision can be guaranteed to reduce the measurement error. Second, the measuring platform 2 is supported by the force sensor 1. The force sensor 1 can measure the change of the supporting force caused by the different mass distribution. The measurement result can be used to calculate the centroid position. The calculation method of the centroid position is the prior art and will not be repeated here. The measuring platform 2 adopts four-point support, and each support point is equipped with a force sensor 1. The change of the supporting force caused by the mass distribution in the x and y directions can be measured at one time. The fixed tool 4 is used to install the measured part 5. Specifically, the measured part 5 is a joystick head, and the structure adopted is a symmetrical structure. The fixed tool 4 plays the function of supporting positioning and fixing the joystick head. The platform bracket 3 cooperates with the first bracket 402 and the second bracket 407 to control the measurement error by ensuring the processing accuracy and roughness of the matching surface.

[0049] The centroid measuring device of the utility model reduces the weight of the structure, selects lightweight and high-strength aviation aluminum materials, reduces the deformation of the measuring platform 2 and the fixing fixture 4, and ultimately achieves high-precision measurement of the measuring device, with a measurement accuracy of up to 0.01 mm.

[0050] When the centroid measuring device of the utility model is used, the rod head of the joystick is fixed on the measuring piece connection groove 403 of the fixed fixture 4. Before the fixed fixture 4 is placed on the measuring platform 2, the reading of the force sensor 1 of the measuring platform 2 is cleared. Then, the fixed fixture 4 is placed on the platform bracket 3 on the measuring platform 2, and the X, Y, and Z directions of the fixed fixture 4 are positioned by the positioning surfaces of the platform bracket 3 and the positioning bracket. After the positioning is completed, the supporting force values ​​of each force sensor 1 are obtained by the readings of the force sensor 1, and the centroid position coordinates in the X and Y directions are calculated by the program. The fixed fixture 4 is turned over and positioned by the positioning surface to obtain the centroid coordinates of the rod head in the Z direction, and finally the coordinates of the rod head in the X, Y, and Z directions are obtained.

[0051] The centroid measuring device of the utility model has high positioning accuracy, simple operation and small measurement result error.

[0052] In the description of this solution, it should be understood that the terms "upper", "lower", "vertical", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this solution.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this solution, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0054] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other. The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the utility model. Various modifications to these embodiments will be obvious to professionals and technicians in this field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features disclosed herein.

Claims

1. A centroid measuring device, characterized in that: include: A measuring platform, wherein a platform bracket and a force sensor are provided on the measuring platform; A fixing tool, comprising a fixing body and a positioning bracket connected to the fixing body, wherein the positioning bracket is placed on the platform bracket; The positioning bracket includes a first bracket and a second bracket. The platform bracket is provided with a three-way positioning surface. The first bracket is a three-way bracket, and the second bracket is a two-way bracket. The three-way positioning surfaces of the first bracket are matched with the three-way positioning surfaces on the corresponding platform bracket, and the two-way positioning surfaces of the second bracket are matched with the two-way positioning surfaces on the corresponding platform bracket.

2. The centroid measuring device according to claim 1, characterized in that: The platform bracket is provided with a first X-direction positioning surface, a first Y-direction positioning surface and a first Z-direction positioning surface; The first bracket is provided with a second X-direction positioning surface, a second Y-direction positioning surface and a second Z-direction positioning surface, the first X-direction positioning surface of the platform bracket contacts the second X-direction positioning surface, the first Y-direction positioning surface contacts the second Y-direction positioning surface, and the first Z-direction positioning surface contacts the second Z-direction positioning surface; The second bracket is provided with a third X-direction positioning surface and a third Z-direction positioning surface. The first X-direction positioning surface of the other platform bracket contacts the third X-direction positioning surface, and the first Z-direction positioning surface contacts the third Z-direction positioning surface.

3. The centroid measuring device according to claim 1 or 2, characterized in that: The fixed body comprises a bottom plate, a top plate and side plates, wherein the side plates are connected between the bottom plate and the top plate, and a measuring piece connecting groove is arranged on the bottom plate, wherein the measuring piece to be measured is fixedly connected in the measuring piece connecting groove.

4. The centroid measuring device according to claim 3, characterized in that: The first bracket is arranged on the outer surface of one of the side panels, and the second bracket is arranged on the outer surface of the other side panel; The first bracket and the second bracket are centrally symmetrically arranged about a central position of the fixing body.

5. The centroid measuring device according to claim 3, characterized in that: A first through hole is provided at the center of the measuring piece connection groove, and a second through hole is provided at a position on the top plate corresponding to the first through hole, and the second through hole is coaxially arranged with the first through hole; The first through hole and the second through hole have the same aperture.

6. The centroid measuring device according to claim 3, characterized in that: The side plate is provided with a third through hole, the third through holes on the two side plates are coaxially arranged, and the first bracket or the second bracket is fixedly arranged around the position of the third through hole.

7. The centroid measuring device according to claim 3, characterized in that: The piece to be measured is bonded in the measuring piece connecting groove.

8. The centroid measuring device according to claim 1, characterized in that: A fourth through hole is arranged at the center of the measuring platform, and the first bracket and the second bracket are arranged on both sides of the fourth through hole.

9. The centroid measuring device according to claim 1, characterized in that: A plurality of the force sensors are provided, and the plurality of force sensors are evenly distributed on the bottom surface of the measuring platform.

10. The centroid measuring device according to claim 1, characterized in that: The platform bracket is welded to the measuring platform.

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