A center of mass measurement device

Abstract

The utility model provides a kind of centroid measuring device, it is related to centroid measuring technical field, including base, two pressure measurement components, mobile pressure measurement component and placing seat, the base has installation surface;Two The pressure measurement components are sequentially spaced apart on the installation surface of base along second direction;The mobile pressure measurement component is set on the installation surface of the base and can reciprocate along first direction;The placing seat has non-collinear first hinged position, second hinged position and third connecting position, the measuring end of one pressure measurement component is hinged with the placing seat in the first hinged position, the measuring end of another pressure measurement component is hinged with the placing seat in the second hinged position, the measuring end of the mobile pressure measurement component is connected with the placing seat by the mobile hinged structure in the third connecting position.It can reduce the difficulty of calculation, while it can ensure the accuracy of pressure measurement of pressure measurement component and mobile pressure measurement component.

Description

Technical Field

[0001] This utility model relates to the field of centroid measurement technology, and in particular to a centroid measurement device. Background Technology

[0002] Determining the center of gravity (COP) of a test specimen allows us to understand its distribution, verify its machining accuracy, and provide a reference for subsequent assembly. The accuracy of COP data is crucial for the successful execution of other tests, especially for critical specimens, where it can directly impact the design and development of the final prototype. Therefore, COP testing is essential for critical specimens before they are put into formal use. In actual use, if the actual COP deviates significantly from the designed COP, it will have serious consequences for the overall prototype; conversely, if the actual COP is close to the designed COP, the performance of the overall prototype will be guaranteed. This is particularly significant in important, high-precision integrated prototype systems.

[0003] Center of mass (CMC) testing is a crucial fundamental measurement technique in scientific research and engineering practice. It has wide applications in fields such as aviation, aerospace, machinery, electronics, instrumentation, and communications. However, some CMC measuring devices are complex in structure and cumbersome to operate. Furthermore, to more accurately measure the CMC position of a specimen and eliminate experimental errors, it is sometimes necessary to rotate the specimen 90° and remeasure its CMC position. This process involves repeatedly disassembling and reassembling the specimen's fixture, which is extremely inconvenient and can easily introduce measurement errors. Utility Model Content

[0004] This invention provides a centroid measuring device to solve the technical problem that when measuring the centroid position of a specimen, it is necessary to rotate the specimen to eliminate experimental errors, which requires repeated disassembly and disassembly of the specimen's clamps, resulting in cumbersome operation.

[0005] This utility model provides a centroid measuring device, comprising: The base has a mounting surface; Two pressure measuring components are arranged sequentially at intervals along a second direction on the mounting surface of the base; A movable pressure measuring component is disposed on the mounting surface of the base, which is movable in a first direction; A placement seat has a first side and a second side facing away from each other. The first side is used to place the specimen, and the second side faces the mounting surface. The second side has a non-collinear first hinge position, a second hinge position, and a third connection position. The measuring end of one pressure measuring component is hinged to the placement seat at the first hinge position, and the measuring end of another pressure measuring component is hinged to the placement seat at the second hinge position. The measuring end of the movable pressure measuring component is connected to the placement seat at the third connection position through a movable hinge structure. The movable hinge structure is used to change the relative position and angle between the movable pressure measuring component and the placement seat. Wherein, the first direction is perpendicular to the mounting surface, and the second direction is perpendicular to the first direction.

[0006] In one embodiment of the present invention, the movable hinge structure includes a slide rail and a slider slidably disposed on the slide rail, the slide rail extending along a third direction, the third direction being perpendicular to the first direction and the second direction respectively; The measuring end of the movable pressure measuring component is hinged to the slider, and the slide rail is provided on the placement seat.

[0007] In one embodiment of the present invention, the movable pressure measuring component is located at the midpoint of the two pressure measuring components along the second direction, and the second direction is perpendicular to the first direction.

[0008] In one embodiment of this utility model, the movable pressure measuring component is movably mounted on the base via an angle adjustment component. The angle adjustment component includes a lead screw nut, a lead screw, and a limiting rail. The lead screw and the limiting rail both extend along the first direction. The lead screw nut is threadedly connected to the lead screw, and the limiting rail is slidably connected to the lead screw nut. The limiting rail extends along the first direction, and the lead screw nut is fixedly connected to the movable pressure measuring component. The lead screw nut is used to drive the movable pressure measuring component to move along the first direction.

[0009] In one embodiment of the present invention, the angle adjustment assembly further includes a driving member for driving the lead screw to rotate about the axial direction of the lead screw, the driving member being connected to the lead screw.

[0010] In one embodiment of this utility model, the driving component is a drive motor.

[0011] In one embodiment of the present invention, a positioning element for positioning the test specimen is provided on the first surface of the placement seat.

[0012] In one embodiment of the present invention, the positioning member includes a first strip and a second strip. The first strip extends along the second direction and is located on the projection line of the line connecting the two pressure measuring components along the second direction. The extension direction of the second strip is perpendicular to the extension direction of the first strip, and the intersection of the extension directions of the first strip and the extension directions of the second strip is the measurement origin. The projection of the measurement origin along the first direction coincides with the projection of the measuring end of one of the pressure measuring components.

[0013] In one embodiment of the present invention, the base has an adjustment surface facing away from the mounting surface, and a leveling component is provided on the adjustment surface.

[0014] In one embodiment of the present invention, the leveling assembly includes at least three screws, one end of which is threadedly connected to the base, and the other end of which is provided with a foot.

[0015] The beneficial effects of this utility model are as follows: The centroid measuring device proposed in this utility model, by setting two pressure measuring components and a movable pressure measuring component that can be reciprocated on the base along a first direction, changes the angle of the specimen relative to the mounting surface by moving the pressure measuring component when measuring the centroid of the specimen. Furthermore, during the process of changing the angle of the specimen relative to the mounting surface by moving the pressure measuring component, the projection positions of the two pressure measuring components and the movable pressure measuring component along the first direction remain unchanged, which can reduce the calculation difficulty and at the same time ensure the accuracy of pressure measurement by the pressure measuring components and the movable pressure measuring component. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 A three-dimensional structural schematic diagram of a centroid measuring device when the placement seat is horizontal, according to an embodiment of this utility model; Figure 2 This is a front view structural schematic diagram of a centroid measuring device with a horizontal placement seat provided in an embodiment of the present invention; Figure 3 for Figure 2 Enlarged structural diagram at point A; Figure 4A schematic diagram of the centroid measuring device when the placement seat rotates at a certain angle, according to an embodiment of this utility model; Figure 5 This is a schematic diagram of the coordinate system for determining the centroid of a centroid measuring device provided in one embodiment of the present invention; Figure 6 This is a schematic diagram of the force on the placement seat in the Y direction when the placement seat is horizontal, according to one embodiment of the present invention; Figure 7 This is a schematic diagram of the force on the placement seat in the X direction when the placement seat is horizontal, according to one embodiment of the present invention; Figure 8 This is a schematic diagram of the force in the Y direction when the placement seat is rotated by an angle θ according to one embodiment of the present invention.

[0018] The attached figures are labeled as follows: base 1, pressure measuring component 2, first hinge point 201, positioning component 3, first strip 301, second strip 302, placement seat 4, slide rail 401, angle adjustment component 5, moving pressure measuring component 6, slider 601, second hinge point 602, leveling component 7, screw 701, foot 702, calculation controller 8. Detailed Implementation

[0019] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0022] Please see Figures 1 to 4This utility model provides a centroid measuring device, including a base 1, two pressure measuring components 2, and a mounting surface for a movable pressure measuring component 6. The two pressure measuring components 2 are sequentially spaced along a second direction on the mounting surface of the base 1. The movable pressure measuring component 6 is reciprocally mounted on the mounting surface of the base 1 along a first direction. The placement seat 4 has a first and a second facing side. The first side is used to place the specimen, and the second side faces the mounting surface. The second side has a non-collinear first hinge position, a second hinge position, and a third connection position. The measuring end of one pressure measuring component 2 is hinged to the placement seat 4 at the first hinge position, and the measuring end of the other pressure measuring component 2 is hinged to the placement seat 4 at the second hinge position. The measuring end of the movable pressure measuring component 6 is connected to the placement seat 4 at the third connection position through a movable hinge structure. The movable hinge structure is used to change the relative position and angle between the movable pressure measuring component 6 and the placement seat 4. The first direction is perpendicular to the mounting surface, and the second direction is perpendicular to the first direction. By setting two pressure measuring components 2 and a movable pressure measuring component 6 that can reciprocate along a first direction on the base 1, when measuring the center of mass of the specimen, the angle of the specimen relative to the mounting surface is changed by the movable pressure measuring component 6. Furthermore, during this process of changing the angle of the specimen relative to the mounting surface by the movable pressure measuring component 6, the projection positions of the two pressure measuring components 2 and the movable pressure measuring component 6 along the first direction remain unchanged. This reduces the computational complexity while ensuring the accuracy of pressure measurements by the pressure measuring components 2 and 6. Both the pressure measuring components 2 and 6 are used to measure the pressure of the specimen on the corresponding measuring end.

[0023] The movable hinge structure includes a slide rail 401 and a slider 601 slidably disposed on the slide rail 401. A groove extends along a third direction, which is perpendicular to both the first and second directions. The measuring end of the movable pressure measuring component 6 is hinged to the slider 601, and the slide rail 401 is provided on the placement base 4. The movable hinge structure allows the movable pressure measuring component 6 to automatically adjust during reciprocating motion along the first direction, ensuring the required accuracy of pressure measurement. In some embodiments, the movable hinge structure may include a groove and a slider slidably disposed within the groove. The slide rail extends along a third direction, the groove is located on the placement base 4, and the slider is hinged to the measuring end of the movable pressure measuring component 6.

[0024] In other embodiments, the movable hinge structure may include a sliding groove and a spherical fulcrum that can slide within the sliding groove. The sliding groove extends along a third direction, and the spherical fulcrum can automatically adjust itself when the angle between the movable pressure measuring component 6 and the placement base 4 changes as the movable pressure measuring component 6 moves along a first direction. The spherical fulcrum is disposed on the measuring end of the movable pressure measuring component 6, and the sliding groove is located on the placement base 4. In still other embodiments, the movable hinge structure may include a universal joint, a slide rail, and a slider. The slide rail extends along a third direction, the slider is slidably disposed on the slide rail, the universal joint is disposed on the measuring end of the movable pressure measuring component 6 and connected to the slider, and the slide rail is disposed on the placement base.

[0025] In this configuration, the moving pressure measuring component 6 is located at the midpoint between the two pressure measuring components 2 along the second direction, which is perpendicular to the first direction. This simplifies the complexity of the centroid calculation formula and facilitates the calculation of the centroid coordinates of the measuring component.

[0026] The movable pressure measuring component 6 is movably mounted on the base 1 via an angle adjustment component 5. The angle adjustment component 5 includes a lead screw nut, a lead screw, and a limiting rail. Both the lead screw and the limiting rail extend along a first direction. The lead screw nut is threadedly connected to the lead screw, and the limiting rail is slidably connected to the lead screw nut. The limiting rail extends along the first direction, and the lead screw nut is fixedly connected to the movable pressure measuring component 6. The lead screw nut drives the movable pressure measuring component 6 to move along the first direction. This reciprocating motion of the movable pressure measuring component 6 along the first direction via the lead screw nut offers advantages such as high precision, smooth operation, and low noise. In some embodiments, the angle adjustment component 5 includes a cylinder, the output shaft of which is connected to the movable pressure measuring component 6. The cylinder drives the movable pressure measuring component 6 to reciprocate along the first direction. In other embodiments, the angle adjustment component 5 includes a linear motor, the output shaft of which is connected to the movable pressure measuring component 6. The linear motor drives the movable pressure measuring component 6 to reciprocate along the first direction. The type of device driving the movable pressure measuring component 6 to reciprocate along the first direction can be adjusted according to actual needs.

[0027] Specifically, the angle adjustment assembly 5 also includes a drive component for driving the lead screw to rotate axially around the lead screw, and the drive component is connected to the lead screw. By setting up the drive component, the automation level of the center of mass measurement device can be improved, and the labor cost can be reduced. In this embodiment, the drive component is a servo motor. Servo motors have advantages such as high-speed performance, high efficiency and energy saving, and strong overload capacity.

[0028] The placement seat 4 has a positioning element 3 on its first surface for positioning the specimen. The positioning element 3 positions the specimen in the desired location. Simultaneously, when the moving pressure measuring component 6 rotates the placement seat 4, changing the angle between the placement seat 4 and the mounting surface, it prevents the specimen from sliding on the placement platform, thus affecting the centroid measurement results. In some embodiments, the placement seat 4 uses an anti-slip material on its first surface to prevent the specimen from sliding on the placement platform when the placement seat 4 rotates. In other embodiments, the placement seat 4 uses a suction cup on its first surface to prevent the specimen from sliding on the placement platform when the placement seat 4 rotates.

[0029] In this embodiment, the positioning member 3 includes a first strip 301 and a second strip 302. The first strip 301 extends along the second direction and is located on the projection line of the line connecting the two pressure measuring components 2 along the second direction. The extension direction of the second strip 302 is perpendicular to the extension direction of the first strip 301, and the intersection of the extension directions of the first strip 301 and the extension directions of the second strip 302 is the measurement origin. The projection of the measurement origin along the first direction coincides with the projection of the measuring end of one of the pressure measuring components 2. Thus, when measuring the specimen, the edge of the specimen can be abutted against the first strip 301 and the second strip 302 respectively, and the measurement origin serves as the measurement origin for measuring the centroid of the specimen. It is understood that the intersection of the extension direction of the first strip 301 and the extension direction of the second strip 302 is the intersection of the extension direction of the first strip 301 near the specimen and the extension direction of the second strip 302 near the specimen. This avoids the influence of the width of the first strip 301 and the second strip 302 on the measurement origin. In some embodiments, the positioning member 3 may be a plurality of first protrusions and second protrusions, the first protrusions being arranged sequentially at intervals along the second direction, and the second protrusions being arranged sequentially at intervals along a third direction, the third direction being perpendicular to the first direction and the second direction, respectively.

[0030] The base 1 has an adjustment surface facing away from the mounting surface, and a leveling component 7 is provided on the adjustment surface. By using the leveling component 7, the base 1 can be leveled, eliminating angular errors caused by the mounting platform of the center of mass measuring device. Simultaneously, by moving the pressure measuring component 6, the placement seat 4 can be leveled, eliminating initial angular deviations caused by part processing or assembly, thus achieving horizontal placement of the placement seat 4, i.e., the first surface is parallel to the horizontal plane. The hinge point between the pressure measuring component 2 and the placement seat 4 is the first hinge point 201, and the hinge point between the moving pressure measuring component 6 and the placement seat 4 is the second hinge point 602. When the placement seat 4 is initially level, the surface formed by the second hinge point 602 and the two first hinge points 201 is parallel to the first surface.

[0031] Specifically, the leveling assembly 7 includes at least three screws 701. One end of each screw 701 is threaded to the base 1, and the other end of each screw 701 is provided with a foot 702. Leveling the base 1 using the screws 701 is simple in structure and easy to operate. In this embodiment, the leveling assembly 7 includes four screws 701, the base 1 is square, and the four screws 701 are located at the four corners of the base 1.

[0032] The measurement principle and method of the centroid measuring device are described below: As shown in the figure, an initial coordinate system OXYZ is established for the center of mass measuring device. Points A and B are the first hinge points 201 of the two pressure measuring components 2, respectively, and point C is the second hinge point 602 of the moving pressure measuring component 6. The line connecting points A and B forms the rotation axis of the placement seat 4 of the center of mass measuring device. The placement seat 4 can reciprocate along the Z-axis (first direction) at point C. For simplified calculation, point O is the midpoint of points AB, the X-axis passes through point C, and the Y-axis passes through points AB. oxyz is the coordinate system of the test piece, where the coordinate position of o relative to O is... ,in Let be the distance between points A and B. Assume the centroid of the test piece relative to coordinate o is... Then the position of the centroid of the specimen in the O coordinate system is The centroid of the placement seat 4 is relative to the coordinate of o. Then, the position of the center of mass of the 4th seat in the O coordinate system is...

[0033] When the base 4 is placed horizontally, the coordinates of support point C are: The readings of pressure measuring component 2 and moving pressure measuring component 6 are When the placement seat 4 rotates by θ after the moving pressure measuring component 6 moves along the first direction, the coordinates of point C are: The readings of pressure measuring component 2 and moving pressure measuring component 6 are The weight of the placement seat 4 is The weight of the test piece is The centroid is calculated as follows: When horizontal, the force on the placement seat 4 is as follows: Figure 5 (Force situation in the Y direction) and Figure 6 (Force situation in the X direction) is shown.

[0034] Since the forces acting on the placement seat 4 in the Z direction are balanced, then: (1) Since the X-axis torque of the placement seat 4 is balanced, then: (2) in, The distance between the center of mass of placement seat 4 along the Y-axis and point O; The distance between the second hinge point 602 and point O along the Y-axis is denoted as O.

[0035] like Figure 7 As shown, since the torque on the Y-axis of the mounting base is balanced, then: (3) in, The distance between the center of mass of seat 4 and point O along the X-axis.

[0036] When rotating by an angle θ, as Figure 8 As shown, since the X-axis torque of the placement seat 4 is balanced at this time, we have: (4) According to equations (1)-(4), we know that:

[0037]

[0038]

[0039] The centroid measuring device is equipped with a calculation controller 8. The above calculation process is automatically calculated by the calculation controller 8 based on the pressure values ​​measured by the pressure measuring component 2 and the moving pressure measuring component 6 when the placement seat 4 is horizontal and rotated at an angle θ. In this way, the centroid of the specimen can be obtained conveniently.

[0040] In summary, by setting two pressure measuring components 2 and a movable pressure measuring component 6 that can reciprocate along the first direction on the base 1, when measuring the center of mass of the specimen, the angle of the specimen relative to the mounting surface is changed by the movable pressure measuring component 6, and the projection positions of the two pressure measuring components 2 and the movable pressure measuring component 6 along the first direction remain unchanged during the process of changing the angle of the specimen relative to the mounting surface by the movable pressure measuring component 6. This reduces the calculation difficulty and ensures the accuracy of pressure measurement by the pressure measuring components 2 and the movable pressure measuring component 6.

[0041] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A centroid measuring device, characterized in that, include: The base has a mounting surface; Two pressure measuring components are arranged sequentially at intervals along a second direction on the mounting surface of the base; A movable pressure measuring component is disposed on the mounting surface of the base, which is movable in a first direction; A placement seat has a first side and a second side facing away from each other. The first side is used to place the specimen, and the second side faces the mounting surface. The second side has a non-collinear first hinge position, a second hinge position, and a third connection position. The measuring end of one pressure measuring component is hinged to the placement seat at the first hinge position, and the measuring end of another pressure measuring component is hinged to the placement seat at the second hinge position. The measuring end of the movable pressure measuring component is connected to the placement seat at the third connection position through a movable hinge structure. The movable hinge structure is used to change the relative position and angle between the movable pressure measuring component and the placement seat. Wherein, the first direction is perpendicular to the mounting surface, and the second direction is perpendicular to the first direction.

2. The centroid measuring device according to claim 1, characterized in that: The movable hinge structure includes a slide rail and a slider slidably disposed on the slide rail. The slide rail extends along a third direction, which is perpendicular to the first direction and the second direction, respectively. The measuring end of the movable pressure measuring component is hinged to the slider, and the slide rail is provided on the placement seat.

3. The centroid measuring device according to claim 1, characterized in that: Along the second direction, the movable pressure measuring component is located at the midpoint between the two pressure measuring components, and the second direction is perpendicular to the first direction.

4. The centroid measuring device according to claim 1, characterized in that: The movable pressure measuring component is movably mounted on the base via an angle adjustment component. The angle adjustment component includes a lead screw nut, a lead screw, and a limiting rail. The lead screw and the limiting rail both extend along the first direction. The lead screw nut is threadedly connected to the lead screw, and the limiting rail is slidably connected to the lead screw nut. The limiting rail extends along the first direction, and the lead screw nut is fixedly connected to the movable pressure measuring component. The lead screw nut is used to drive the movable pressure measuring component to move along the first direction.

5. The centroid measuring device according to claim 4, characterized in that: The angle adjustment assembly further includes a drive component for driving the lead screw to rotate about the axial direction of the lead screw, the drive component being connected to the lead screw.

6. The centroid measuring device according to claim 5, characterized in that: The driving component is a drive motor.

7. The centroid measuring device according to any one of claims 1-6, characterized in that: The first surface of the placement base is provided with a positioning element for positioning the test specimen.

8. The centroid measuring device according to claim 7, characterized in that: The positioning element includes a first strip and a second strip. The first strip extends along the second direction and is located on the projection line of the line connecting the two pressure measuring components along the second direction. The extension direction of the second strip is perpendicular to the extension direction of the first strip, and the intersection of the extension directions of the first strip and the extension directions of the second strip is the measurement origin. The projection of the measurement origin along the first direction coincides with the projection of the measuring end of one of the pressure measuring components.

9. The centroid measuring device according to any one of claims 1-6, characterized in that: The base has an adjustment surface facing away from the mounting surface, and a leveling component is provided on the adjustment surface.

10. The centroid measuring device according to claim 9, characterized in that: The leveling assembly includes at least three screws, one end of which is threaded to the base, and the other end of which is provided with a foot.

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