1. An angular rigidity testing device of a flexible joint thin-wall part for aerospace is characterized by comprising:

a base;

the clamping device is used for mounting the flexible joint;

the lever device is provided with a testing mechanism and a corresponding balance calibration mechanism; and

a camera display device for shooting and displaying the position of the lever device,

wherein the testing mechanism is provided with at least a measuring scale, the center of the measuring scale is positioned at the top of the flexible joint,

the balance calibration mechanism is provided with a calibration bracket, a fixed scale, a dynamometer and a spiral micrometer,

the calibration support is mounted on the base,

the center of the fixed scale is connected with the calibration bracket,

the dynamometer is fixed on the calibration support and is positioned above one side of the fixed scale close to the measurement scale for measuring the force applied to the measurement scale,

the lower end of the dynamometer is provided with a first convex column and a second convex column which are positioned on the same horizontal line, the first convex column is positioned above the measuring scale, the second convex column is arranged opposite to the first convex column,

the spiral micrometer is fixed on the calibration support, is positioned above one side of the fixed scale, which is far away from the measuring scale, and is used for adjusting the angle of the fixed scale.

2. The angular stiffness testing device of the thin-walled part of the flexible joint for aerospace according to claim 1, wherein:

wherein the testing mechanism is also provided with an oil container and two blades,

the oil container is arranged on the base and corresponds to the calibration bracket,

the measuring scale is positioned above the oil container and the clamping device and is contacted with the flexible joint,

the oil container is filled with oil solution, the cross section of the oil container is of a U-shaped structure,

the two blades are respectively arranged at two ends of the measuring scale and are immersed in the oil container for reducing errors.

3. The angular stiffness testing device of the thin-walled part of the flexible joint for aerospace according to claim 1, wherein:

wherein the clamping device is positioned at the middle concave part of the oil container,

the flexible joint is arranged on the clamping device and is in contact with the measuring scale.

4. The angular stiffness testing device of the thin-walled part of the flexible joint for aerospace according to claim 1, wherein:

wherein the camera shooting display device is provided with a camera bracket, a camera and a display,

the camera support is arranged on the base and corresponds to the calibration support,

the center of the camera is provided with a horizontal marking line for calibrating the angle of the measuring scale,

the camera bracket is provided with a sliding wedge block for adjusting the camera to move up and down.

5. The angular stiffness testing device of the thin-walled part of the flexible joint for aerospace according to claim 1, wherein:

the base is provided with four gyro-type angle supports and is made of marble or ceramic materials.

6. The method for testing the angular rigidity of the thin-walled part of the flexible joint for aerospace as claimed in claim 1, wherein:

wherein the measuring scale is also provided with weights,

the weight is fixed on the measuring scale through a steel wire.

7. An angular rigidity testing method of an aerospace flexible joint thin-wall part, which uses the angular rigidity testing device of the aerospace flexible joint thin-wall part as claimed in any one of claims 1 to 6 to test the angular rigidity of a flexible joint, and is characterized by comprising the following steps:

step S1, adjusting the position of the camera to make the marking line of the camera be in the center of the display;

step S2 of mounting the flexible joint and mounting the measurement scale on the flexible joint;

step S3, a weight is placed on one side of the measuring scale, which is far away from the balance calibration mechanism, and is close to the flexible joint, a knob of the spiral micrometer above the fixed scale is adjusted, so that the measuring scale is parallel to the camera marking line, and data of the dynamometer are emptied;

step S4, moving the weight to one side of the measuring scale far away from the fixed scale, and recording the force arm L of the stress of the measuring scale_AReadjusting the knob of the micrometer to make the measuring scale coincide with the marking line of the camera, and measuring the linear displacement Y generated by the stress point of the measuring scale_AAnd obtaining a value F of said dynamometer_A；

Step S5, obtaining the angular rigidity K of the flexible joint through geometric calculation₀The numerical value of (c).

8. The method for testing the angular rigidity of the thin-walled part of the flexible joint for aerospace as claimed in claim 7, wherein:

wherein the angular stiffness K₀The numerical calculation method of (2) is as follows:

when theta is less than 0.01, theta is taken to be approximately equal to sin theta, then:

in the above formula, F_AFor measuring the force applied to the scale, M is the moment applied to the flexible joint, θ is the angular deformation produced by the measuring scale, L_AFor measuring the moment arm of the scale_AThe linear displacement generated for the point of force application.

Background

The rapid development in the fields of aviation, aerospace and the like has higher and higher requirements on high-performance micro-nano processing technology, and the performance test of the high-performance micro-nano processing structural member brings higher requirements. The integral double-balance-ring flexible joint for aerospace is a typical micro-nano machining key part, and performance evaluation is mainly evaluated through an angular rigidity test of a machined double-balance thin rib. In recent years, the research on the micromachining technology of key components of inertial navigation is more and more mature, for example, flexible joints of aerospace inertial navigation gyroscopes have four groups of fine rib structures, the distance between adjacent holes of the four groups of fine rib structures is less than 0.5 micron, the requirements of extremely high dimensional accuracy and surface integrity are required to be met, the actual machining yield is low, the machining of the parts is difficult, and therefore a more accurate instrument is required to measure the angular stiffness of the machined parts, but no mature measurement method exists for testing the angular stiffness of the key components of aerospace inertial navigation, and no special angular stiffness measurement method and related devices exist in the prior art for testing the materials.

Disclosure of Invention

In order to solve the problems, the invention provides a device and a method for testing the angular rigidity of a flexible joint thin-wall part for spaceflight, which adopts the following technical scheme:

the invention provides an angular rigidity testing device of a flexible joint thin-wall part for spaceflight, which is characterized by comprising the following components: a base; the clamping device is used for mounting the flexible joint; the lever device is provided with a testing mechanism and a corresponding balance calibration mechanism; and a camera display device for shooting and displaying the position of the lever device, wherein the testing mechanism is at least provided with a measuring scale, the center of the measuring scale is positioned at the top of the flexible joint, the balance calibrating mechanism is provided with a calibrating support, a fixed scale, a dynamometer and a spiral micrometer, the calibrating support is arranged on the base, the center of the fixed scale is connected with the calibrating support, the dynamometer is fixed on the calibrating support and positioned above one side of the fixed scale close to the measuring scale, a top for measuring the one side of measuring the scale is kept away from to the staff gauge, is used for adjusting the angle of fixed scale, and the lower extreme of dynamometer is equipped with two first projections and the second projection that are located same water flat line, and first projection is located the top of measuring the scale, and the second projection sets up with first projection back of the body mutually, and the micrometer screw is fixed on the calibration support, is located the fixed scale.

The testing mechanism is also provided with an oil container and two blades, the oil container is arranged on the base and corresponds to the calibration support, the measuring scale is positioned above the oil container and the clamping device and is in contact with the flexible joint, oil solution is filled in the oil container, the cross section of the oil container is of a U-shaped structure, and the two blades are respectively arranged at two ends of the measuring scale and are immersed in the oil container to reduce errors.

The testing device for the angular rigidity of the thin-walled part of the flexible joint for spaceflight, provided by the invention, can also have the characteristic that the clamping device is positioned at the concave part in the middle of the oil container, and the flexible joint is arranged on the clamping device and is in contact with the measuring scale.

The device for testing the angular rigidity of the flexible joint thin-wall part for the aerospace can also have the characteristics that the camera shooting and displaying device is provided with a camera support, a camera and a display, the camera support is arranged on the base and corresponds to the calibration support, a horizontal camera marking line is arranged at the center of the camera and is used for calibrating the angle of the measuring scale, and the camera support is provided with a sliding wedge block which is used for adjusting the camera to move up and down.

The device for testing the angular rigidity of the thin-walled part of the flexible joint for aerospace provided by the invention can also have the characteristic that the base is provided with four gyro-type angular supports and is made of marble or ceramic materials.

The invention provides a method for testing the angular rigidity of a flexible joint thin-wall part for aerospace, which uses the angular rigidity of the flexible joint thin-wall part for aerospaceThe testing device is used for testing the angular rigidity of the flexible joint and is characterized by comprising the following steps: the device for testing the angular rigidity of the thin-walled part of the flexible joint for aerospace provided by the invention also has the characteristics that in the step S1, the position of the camera is adjusted, so that the marking line of the camera is positioned in the center of the display; step S2, mounting a flexible joint and mounting a measuring scale on the flexible joint; step S3, placing weights on one side of the measuring scale, which is far away from the balance calibration mechanism and close to the flexible joint, adjusting a knob of the spiral micrometer above the fixed scale to enable the measuring scale to be parallel to the camera marking line, and emptying data of the dynamometer; step S4, moving the weight to one side of the measuring scale far away from the fixed scale, and recording the force arm L of the stress of the measuring scale_AReadjusting the knob of the micrometer to make the measuring scale coincide with the marking line of the camera, and measuring the linear displacement Y generated by the stress point of the measuring scale_AAnd obtaining the value F of the dynamometer_A(ii) a Step S5, obtaining the angular rigidity K of the flexible joint through geometric calculation₀The numerical value of (c).

The method for testing the angular rigidity of the thin-walled part of the flexible joint for aerospace provided by the invention can also have the characteristic that the angular rigidity K₀The numerical calculation method of (2) is as follows:

when theta is less than 0.01, theta is taken to be approximately equal to sin theta, then:

wherein F_AFor measuring the force applied to the scale, M is the moment applied to the flexible joint, θ is the angular deformation produced by the measuring scale, L_AFor measuring the moment arm of the scale_AThe linear displacement generated for the point of force application.

The method for testing the angular rigidity of the thin-walled part of the flexible joint for spaceflight, provided by the invention, can also have the characteristic that the weight is fixed on the measurement scale through the steel wire.

Action and Effect of the invention

According to the device and the method for testing the angular rigidity of the flexible joint thin-wall part for spaceflight, the displacement deviation is accurately shot by adopting the high-speed camera, the reference standard position is determined through the constant value of the dynamometer, and the angular rigidity of the part is calculated according to the displacement deviation measured by the part balancing system and the corresponding angular rigidity calculation formula. The angular stiffness testing device provided by the invention has the advantages that the angular stiffness testing device is provided with a set of manual vertical adjusting system and a double-lever balance system, the offset of a part can be accurately measured, the angular stiffness testing device and the angular stiffness testing method provided by the invention have the advantages of simplicity in operation, accuracy in testing, high reliability, short measuring time and the like, the offset size can be accurately judged and displayed on a display by shooting of a camera, and the visibility is strong.

Drawings

FIG. 1 is a schematic diagram of an angular stiffness test in an embodiment of the present invention;

FIG. 2 is an oblique view I of an angular stiffness test apparatus according to an embodiment of the present invention;

FIG. 3 is a second oblique view of an angular stiffness testing apparatus in an embodiment of the present invention;

FIG. 4 is a front view of an angular stiffness test apparatus in an embodiment of the present invention;

FIG. 5 is a top view of an angular stiffness test apparatus according to an embodiment of the present invention;

FIG. 6 is a left side view of an angular stiffness test apparatus in an embodiment of the present invention;

FIG. 7 is a rear view of an angular stiffness test apparatus in an embodiment of the present invention;

fig. 8 is a partially enlarged view of the balance calibration mechanism in the embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.

< example >

The embodiment provides an angular stiffness testing device 100 for a flexible joint thin-wall part for aerospace, which is used for calculating the angular stiffness of the flexible joint thin-wall part through the measured position offset of a flexible joint.

FIG. 1 is a schematic diagram of an angular stiffness test in an embodiment of the present invention; FIG. 2 is an oblique view I of an angular stiffness test apparatus according to an embodiment of the present invention; FIG. 3 is a second oblique view of an angular stiffness testing apparatus in an embodiment of the present invention; FIG. 4 is a front view of an angular stiffness test apparatus in an embodiment of the present invention; FIG. 5 is a top view of an angular stiffness test apparatus according to an embodiment of the present invention; FIG. 6 is a left side view of an angular stiffness test apparatus in an embodiment of the present invention; fig. 7 is a rear view of an angular stiffness test apparatus in an embodiment of the invention.

As shown in fig. 1, the angular stiffness of the thin-walled part of the flexible joint is tested according to the lever principle, and the angular stiffness of the thin-walled part of the flexible joint is calculated by measuring the position offset of the flexible joint by the angular stiffness testing apparatus 100 shown in fig. 2 to 7.

As shown in fig. 2 to 7, the angular rigidity testing apparatus 100 includes: the device comprises a base 1, a clamping device 2, a lever device 3 and a camera display device 4.

The base 1 should be of a material that is sufficiently rigid and stiff to minimize the effects of the environment on the deformation and mechanical properties of the base, such as temperature and humidity. In this embodiment, the base 1 is made of marble and ceramic materials and has four top-shaped corners 11 for supporting.

The clamping device 2, the lever device 3 and the camera shooting display device 4 are all arranged on the base 1.

And the clamping device 2 is used for installing a flexible joint, and the flexible joint is buckled on the clamping device 2.

The lever device 3 has a testing mechanism 31 and a corresponding balance calibration mechanism 32.

The test mechanism 31 has a measurement scale 311, an oil container 312, and two blades 313.

The center of the measurement scale 311 is located at the top of the flexible joint.

The oil container 312 is provided on the base 1 in correspondence with the balance calibrating mechanism 32.

The measuring scale 311 is located above the oil container 312 and the chuck 3, and is in contact with the flexible joint.

The oil container 312 is filled with an oil solution, and the cross section of the oil container 312 is a U-shaped structure.

The clamping device 2 is positioned in the middle concave part of the oil container 312.

The two blades 313 are respectively arranged at two ends of the measuring scale 311 and are immersed in the oil container 312, so that the damping is large, and the measuring scale 311 can be prevented from swinging in the measuring process to cause measuring errors.

Fig. 8 is a partially enlarged view of the balance calibration mechanism in the embodiment of the present invention.

As shown in fig. 8, the balance calibration mechanism 32 includes a calibration holder 321, a fixed scale 322, a load cell 323, and a micrometer screw 324.

The calibration support 321 is mounted on the base 1.

The center of the fixed scale 322 is connected to the calibration support 321.

A force gauge 323 is fixed to the calibration stand 321 above a side of the fixed scale 322 adjacent to the measurement scale 311 for measuring a force applied to the measurement scale 311.

The lower end of the force gauge 323 is provided with a first convex column 323a and a second convex column 323b which are located on the same horizontal line, the first convex column 323a is located above the measuring scale 311, and the second convex column 323b is arranged opposite to the first convex column 323a, located above the fixed scale 322 and in contact with the fixed scale 322.

The micrometer screw 324 is fixed on the calibration stand 321 above a side of the fixed scale 322 away from the measuring scale 311, and is used for adjusting the angle of the fixed scale 322.

And the camera shooting and displaying device 4 is used for shooting and displaying the position of the lever device 3.

The camera display device 4 has a camera holder 41, a camera 42, and a display (not shown in the figure).

The camera mount 41 is provided on the base 1 in correspondence with the calibration mount 321.

The center of the camera 42 is provided with a horizontal marking line for calibrating the angle of the measuring scale 311.

The camera bracket 41 has a sliding wedge 411 and a spring joint 412, and the position of the camera 42 can be adjusted by a bolt 413, a bolt 414 and a bolt 415.

When measuring the angular stiffness, the weight is fixed on the measuring scale 311 through a steel wire.

Based on the angular stiffness testing device, the embodiment also provides an angular stiffness testing method for the flexible joint thin-wall part for aerospace, and the angular stiffness of the flexible joint thin-wall part is calculated through the position offset of the flexible joint measured by the device.

The angular rigidity testing device for the aerospace flexible joint thin-wall part is used for testing the angular rigidity of the flexible joint, and comprises the following steps:

and step S1, adjusting the position of the camera to make the marking line of the camera be positioned in the center of the display.

Step S2, the flexible joint is mounted, and the measurement scale is mounted on the flexible joint.

And step S3, placing weights on one side of the measuring scale, which is far away from the balance calibration mechanism, and close to the flexible joint, adjusting a knob of the spiral micrometer above the fixed scale to enable the measuring scale to be parallel to the camera marking line, and emptying data of the dynamometer.

Step S4, moving the weight to one side of the measuring scale far away from the fixed scale, and recording the force arm L of the stress of the measuring scale_AReadjusting the knob of the micrometer to make the measuring scale coincide with the marking line of the camera, and measuring the linear displacement Y generated by the stress point of the measuring scale_AAnd obtaining the value F of the dynamometer_A。

Step S5, obtaining the angular rigidity K of the flexible joint through geometric calculation₀The numerical value of (c).

Angular stiffness K₀The numerical calculation method of (2) is as follows:

when theta is less than 0.01, theta is taken to be approximately equal to sin theta, then:

in the above formula, F_AFor measuring the force applied to the scale, M is the moment applied to the flexible joint, θ is the angular deformation produced by the measuring scale, L_AFor measuring the moment arm of the scale_AThe linear displacement generated for the point of force application.

Examples effects and effects

The angular stiffness testing device in the embodiment comprises a base, a clamping device, a lever device and a camera shooting display device. The lever device is provided with a testing mechanism and a corresponding balance calibration mechanism. The accredited testing organization has at least and measures the scale, the center of measuring the scale is located flexible joint's top, balanced accredited testing organization has the calibration support, fixed scale, dynamometer and spiral micrometer, fixed scale's center and calibration leg joint, the dynamometer is located the top that fixed scale is close to one side of measuring the scale, a power that is used for measuring the measurement scale and receives, spiral micrometer is located the top that one side of measuring the scale was kept away from to fixed scale, an angle that is used for adjusting fixed scale. The offset of the part can be accurately measured through the structure, and the angular stiffness of the part is calculated according to the measured displacement offset and a corresponding angular stiffness calculation formula.

In addition, the camera bracket of the camera shooting display device of the embodiment is provided with the sliding wedge block, so that the camera can be adjusted to move up and down, the flexibility is high, the measurement position of the mobile camera can be manually adjusted, and the operation is simple and convenient.

In addition, in the embodiment, the left end and the right end of the measuring scale in the container are both provided with two blades immersed in the oil solution, so that the damping is large, the measuring error caused by swinging of the balance scale rod in the measuring process can be prevented, the oil liquid of the measuring system can be repeatedly utilized, the resource can be saved, and the cost is reduced.

The above-described embodiments are merely illustrative of specific embodiments of the present invention, and the present invention is not limited to the description of the above-described embodiments.