CN211855698U - Special clamp for measuring rotational inertia of revolving body - Google Patents
Special clamp for measuring rotational inertia of revolving body Download PDFInfo
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- CN211855698U CN211855698U CN202020826820.7U CN202020826820U CN211855698U CN 211855698 U CN211855698 U CN 211855698U CN 202020826820 U CN202020826820 U CN 202020826820U CN 211855698 U CN211855698 U CN 211855698U
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Abstract
The utility model discloses a special fixture for measuring rotational inertia of a revolving body, which comprises a fixture body and a clamping device, wherein the clamping device is arranged on the fixture body, an object to be measured of the revolving body is clamped by the clamping device, and the fixture body is provided with a vertical contact surface, a 45-degree contact surface and a horizontal contact surface; the clamp body is fixedly connected with the measuring table through a vertical contact surface, a 45-degree contact surface and a horizontal contact surface respectively, so that the axis of the object to be measured of the revolving body forms 90 degrees, 45 degrees and 0 degrees with the measuring table respectively, and the placement of six postures of the object to be measured of the revolving body is realized; an operator can fix the revolving body object to be measured on the upper end of the measuring table board according to a certain angle through the clamp, and the clamp has the advantages of safe operation, short placing period, accurate placing angle of the object to be measured, reliable positioning and clamping and stable integral hoisting.
Description
Technical Field
The utility model relates to an anchor clamps technical field specifically is a special fixture for solid of revolution inertia is measured.
Background
The rotational inertia can directly reflect the difficulty degree of the change of the rotational state of the rigid body. Has important physical significance in the industrial fields of scientific experiments, engineering technology, spaceflight, machinery and the like. The MPC inertia tester is a universal mass center and rotational inertia comprehensive test bench, and measures the mass center coordinates and mass of an object to be tested and the rotational inertia and the inertia product passing through any axis by placing six postures of the object to be tested. The method for measuring the rotational inertia used by the instrument is a swing method, and the method is used for indirectly obtaining the rotational inertia by measuring the swing period of a rigid body.
The basic principle of the moment of inertia measurement is known as follows: the moment of inertia through an arbitrary axis can be expressed by the following equation:
IH=IXXcos2α+IYYcos2β+IZZcos2-2IXYcosαcosβ-2IYZcosβcos-2IXZcosαcos （1）
IHis the moment of inertia through its center of mass; i isXXIs the moment of inertia through its centroid parallel to the X-axis; i isYYIs the moment of inertia through its centroid parallel to the Y-axis; i isZZ-a moment of inertia parallel to the Z-axis through its centroid; i isXY、IXZ、IYZInertia products in three directions are respectively obtained; alpha is the included angle between the torsion bar rotating shaft H and the X axis of the coordinate system on the object to be measured; beta is the included angle between the torsion bar rotating shaft H and the Y axis of the coordinate system on the object to be measured; is the included angle between the torsion bar rotating shaft H and the Z axis of the coordinate system on the object to be measured; to find IXX、IYY、IZZ、IXY、IXZ、IYZIf 6 equations are needed to be established, that is, if the object to be measured is placed on the measuring platform 6 times, it can be easily seen from the formula (1) whether the I can be measured with higher accuracyXX、IYY、IZZ、IXY、IXZ、IYZThe key is how to accurately measure alpha, beta; in the measurement process of using the MPC inertia tester, the object to be measured is placed in six postures, and the object to be measured and the measurement platform cannot move relatively, the six postures are realized by placing the object to be measured on the measurement platform differently, so that the included angles between three coordinate axes of the object to be measured and a rotating shaft (a virtual straight line perpendicular to the measurement platform is called as the rotating shaft) are different. The six postures are respectively defined as a posture one, a posture two, a posture three, a posture four, a posture five and a posture six. According to the requirement of the MPC inertia tester, the included angles between the three coordinate axes X, Y, Z of the object to be tested and the rotating shaft at the next attitude are respectively: 0 °, 90 °; the included angles between the three coordinate axes X, Y, Z of the object to be measured and the rotating shaft under the second posture are respectively: 90 °, 0 °, 90 °; the included angles between the three coordinate axes X, Y, Z of the object to be measured and the rotating shaft under the posture three are respectively: 45 °, 90 °; the included angles between the three coordinate axes X, Y, Z of the object to be measured and the rotating shaft under the posture four are respectively: 90 °, 0 °; the included angles between the three coordinate axes X, Y, Z of the object to be measured and the rotating shaft under the posture five are respectively: 45 °, 90 °, 45 °; the included angles between the three coordinate axes X, Y, Z of the object to be measured and the rotating shaft under the posture six are respectively: 90 degrees, 45 degrees and 45 degrees. And each attitude needs to measure the loaded rotational inertia of the instrument and the idle-load rotational inertia of the instrument (including a clamp), and the rotational inertia of the object to be measured is calculated by subtracting the idle-load rotational inertia of the instrument from the loaded rotational inertia of the instrument.
Because the accuracy of the placing angle of the object to be measured and whether the object to be measured can be fixed above the rack directly influence the precision of the measuring result, the placing angle and the fixing of the object to be measured become the key steps of the rotational inertia measurement. In both military and civil fields, a large number of revolving body products with complex internal structures exist, such as rockets, guided missiles and the like. The moment of inertia parameter is a very important parameter of such products, and it is often necessary to perform moment of inertia measurements on them. In the test process, in order to ensure that the revolving body can be accurately placed in six postures on the measuring rack, the placing time is reduced, the positioning and clamping are reliable, the integral hoisting is stable, the placing operation is safe, and some assembling parts do not interfere with the clamp, so that the special clamp for measuring the rotational inertia of the revolving body is very necessary.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the problem that the angle error is difficult to control, put the cycle length, put the security poor is put to current solid of revolution determinand, and provide a special fixture for solid of revolution inertia is measured.
Realize the utility model discloses the technical scheme of purpose is:
a special fixture for measuring rotational inertia of a revolving body comprises a fixture body and a clamping device, wherein the clamping device is arranged on the fixture body, an object to be measured of the revolving body is clamped by the clamping device, and the fixture body is provided with a vertical contact surface, a 45-degree contact surface and a horizontal contact surface; the clamp body is fixedly connected with the measuring table through a vertical contact surface, a 45-degree contact surface and a horizontal contact surface respectively, so that the axes of the revolving body object to be measured form 90 degrees, 45 degrees and 0 degrees with the measuring table respectively, and the arrangement of six postures of the revolving body object to be measured is realized.
The clamping device comprises a pair of clamping mechanisms which are symmetrically arranged, each clamping mechanism comprises an object to be tested supporting part and an object to be tested clamping part, the object to be tested supporting part is arranged on a position adjusting plate of the clamp body and can move on the position adjusting plate, and two ends of the object to be tested supporting part are respectively connected with the object to be tested clamping part through pressing screw rods; the rotary body object to be measured is clamped between the object supporting component and the object clamping component.
The supporting part for the object to be detected comprises a slide rail bottom plate, a guide rail is arranged on the slide rail bottom plate, slide blocks are arranged at two ends of the guide rail respectively, a supporting block for the object to be detected is arranged on each slide block, the two supporting blocks for the object to be detected are bilaterally symmetrical to form a V-shaped supporting block, a movable first lead screw is arranged in the supporting block for the object to be detected, one end of the first lead screw is movably connected with a bearing seat through a bearing, a lead screw sleeve is arranged at the other end of the first lead screw and is connected with a hand wheel through the bearing arranged on the bearing seat, the first lead screw is driven by shaking the hand wheel to enable the supporting block for the object to.
The object to be measured clamping part comprises a pressing plate, a second screw rod is arranged in the middle of the pressing plate, the pressing plate is in threaded connection with the second screw rod, and the end part of one end of the second screw rod is connected with a hand wheel; the other end of the second screw rod is in clearance connection with the clamping block, and the end part of the second screw rod penetrates through the clamping block and is connected with the bolt through the gasket.
The top end of the compression screw rod is respectively connected with the two ends of the pressing plate and the threads, the top end of the compression screw rod penetrates through the pressing plate to be connected with the hand wheel, and the bottom end of the compression screw rod is fixedly connected with a sliding rail bottom plate of the supporting part of the object to be detected.
And the supporting block of the object to be detected is provided with a buffer block.
The buffer block is made of a high-strength rubber material, and a counter bore is formed in the buffer block.
The clamping block is characterized by a V-shaped groove and a rectangular groove.
And two ends of the first screw rod are provided with positioning surfaces.
The object to be detected of the revolving body is cylindrical or conical, or the revolving body with the characteristics of a cylinder and a cone, and the revolving body accessory with the characteristics of edge strips and wings assembled on the surface; the diameter of the object to be measured of the revolving body is 50-300mm, and the length is 700-2500 mm.
The utility model provides a special fixture for revolving body inertia measurement, the fixture body and the measuring table-board of the fixture have 3 contact planes, the included angle between the revolving body object to be measured axis direction and the measuring table-board can be adjusted through the contact of different planes and the measuring table-board, the included angle is 0 degree, 45 degrees and 90 degrees respectively, the taking out of the revolving body object to be measured is also more convenient; the clamp can be placed in all 6 postures required by measurement, a hand wheel is arranged on one side of the object to be measured supporting part, the object to be measured clamping part and the pressing screw rod, the object to be measured on the clamp can be better fixed by adjusting the hand wheel, the objects to be measured on the revolving bodies with different diameters can be measured, and the objects to be measured on the revolving bodies with different lengths can be measured by matching with a position adjusting plate. The clamp can measure the diameter range of the object to be measured of the revolving body to be about 50 mm-300 mm, and the length range of the object to be measured of the revolving body to be about 700 mm-2500 mm; the overall design of the clamp is convenient to fix on the workbench, the operation is safe, the placing period is short, the integral hoisting is stable, the positioning and clamping are reliable, the placing angle of the revolving body object to be tested is accurate, and meanwhile, the interference problem of the surface of the revolving body object to be tested, such as accessories of side wings and the like, is also avoided. An operator can fix the revolving body object to be measured on the upper end of the measuring table board according to a certain angle through the clamp, and the clamp has the advantages of safe operation, short placing period, accurate placing angle of the object to be measured, reliable positioning and clamping and stable integral hoisting.
Drawings
FIG. 1 is an isometric view of the overall structure of a special fixture for measuring the rotational inertia of a revolving body;
FIG. 2 is a schematic structural view of the clamp body;
FIG. 3 is a schematic structural view of the clamping device;
FIG. 4 is a schematic diagram of an exploded structure of a supporting member of an object under test;
FIG. 5 is an exploded view of the DUT clamping part;
FIG. 6 is a schematic structural diagram of the first lead screw;
FIG. 7 is a schematic diagram of a posture four, a posture six and a posture two when the object to be measured of the revolving body is clamped;
FIG. 8 is a schematic diagram of a posture three and a posture five when a revolving body object to be measured is clamped;
FIG. 9 is a schematic diagram of a first posture of the revolving body when the object to be measured is clamped;
in the figure: 1. the fixture comprises a fixture body 2, a revolving body object to be tested 3, a clamping device 4, a position adjusting plate 5, an object to be tested supporting part 6, an object to be tested clamping part 7, a vertical contact surface 8 of the fixture body, a 45-degree contact surface 9 of the fixture body, a horizontal contact surface 10 of the fixture body, a compression screw rod 11, a hand wheel 5-1, a bearing seat 5-2, a bearing 5-3, a screw rod sleeve 5-4, a buffer block 5-5, an object to be tested supporting block 5-6, a first screw rod 5-7, a sliding block 5-8, a sliding rail bottom plate 5-9, a guide rail 5-10, a positioning surface 6-1, a gasket 6-2, a second screw rod 6-3, a pressing plate 6-4, a bolt 6-5 and a clamping.
Detailed Description
The present invention will be further explained with reference to the drawings and examples, but the present invention is not limited thereto.
Example (b):
as shown in fig. 1 and 2, a special fixture for measuring rotational inertia of a revolving body comprises a fixture body 1 and a clamping device 3, wherein the clamping device 3 is arranged on the fixture body 1, an object 2 to be measured of the revolving body is clamped by the clamping device 3, and the fixture body 1 is provided with a vertical contact surface 7, a 45-degree contact surface 8 and a horizontal contact surface 9; the clamp body 1 is fixedly connected with the measuring table through a vertical contact surface 7, a 45-degree contact surface 8 and a horizontal contact surface 9 respectively, so that the axis of the revolving body object to be measured 2 forms 90 degrees, 45 degrees and 0 degree with the measuring table respectively, and the placement of six postures of the revolving body object to be measured 2 is realized.
The revolving body object to be measured 2 is cylindrical or conical, or a revolving body with characteristics of a cylinder and a cone, and a revolving body accessory with characteristics of edge strips and wings assembled on the surface; the diameter of the object to be measured of the revolving body is 50-300mm, and the length is 700-2500 mm.
As shown in fig. 3, the clamping device 3 includes a pair of clamping mechanisms symmetrically arranged with respect to each other, each clamping mechanism includes an object-to-be-tested supporting member 5 and an object-to-be-tested clamping member 6, the object-to-be-tested supporting member 5 is disposed on a position adjusting plate 4 of the clamp body 1 and can move on the position adjusting plate 4, and two ends of the object-to-be-tested supporting member 5 are respectively connected to the object-to-be-tested clamping member 6 through pressing screws 10; the revolving body object to be measured 2 is clamped between the object to be measured supporting part 5 and the object to be measured clamping part 6; the clamping position of the revolving body object to be tested 2 along the axis direction can be adjusted by adjusting the relative position of the object to be tested supporting part 5 on the position adjusting plate 4, so that the revolving bodies with different lengths can be clamped and measured.
As shown in FIG. 4, the supporting member 5 for the object to be measured comprises a sliding rail bottom plate 5-8, a guiding rail 5-9 is arranged on the sliding rail bottom plate 5-8, two ends of the guiding rail 5-9 are respectively provided with a sliding block 5-7, each sliding block 5-7 is provided with a supporting block 5-5 for the object to be measured, two supporting blocks 5-5 for the object to be measured are bilaterally symmetrical to form a V-shaped supporting block, a movable first screw rod 5-6 is arranged in the supporting block 5-5 for the object to be measured, one end of the first screw rod 5-6 is movably connected with a bearing seat 5-1 through a bearing 5-2, the other end of the first screw rod 5-6 is provided with a screw rod sleeve 5-3, the screw rod sleeve 5-3 is connected with a hand wheel 11 through a bearing 5-2 arranged on the bearing seat 5-1, the, thereby adjusting the distance between the two object supporting blocks 5-5 to adapt to the revolving body objects to be tested 2 with different sizes.
As shown in fig. 5, the object clamping part 6 to be tested comprises a pressing plate 6-3, a second screw rod 6-2 is arranged in the middle 6-3 of the pressing plate, the pressing plate 6-3 is in threaded connection with the second screw rod 6-2, and the end part of one end of the second screw rod 6-1 is connected with a hand wheel 11; the other end of the second screw rod 6-2 is in clearance connection with the clamping block 6-5, and the end part passes through the clamping block 6-5 and is connected with the bolt 6-4 through the gasket 6-1.
The top end of the compression screw rod 10 is respectively connected with the two ends of the pressing plate 6-3 and the threads, the top end of the compression screw rod passes through the pressing plate 6-3 to be connected with the hand wheel 11, and the bottom end of the compression screw rod 10 is fixedly connected with the slide rail bottom plate 5-8 of the object supporting part 5 to be detected.
And a buffer block 5-4 is arranged on the supporting block 5-5 of the object to be detected.
The buffer block 5-4 is made of a high-strength rubber material, a counter bore is formed in the buffer block 5-4, and the buffer block and the counter bore have the function of protecting a revolving body object to be tested.
The clamping blocks 6-5 are characterized by V-shaped grooves and rectangular grooves, so that the revolving body to-be-tested objects 1 with different diameters can be clamped conveniently, and meanwhile, the interference phenomenon of characteristic accessories of edge strips and wings of the revolving body to-be-tested objects is avoided.
As shown in FIG. 6, the two ends of the first screw rod 5-6 are provided with positioning surfaces 5-10.
The use process of the clamp is as follows:
when using the utility model discloses the time, at first establish cartesian coordinate system based on solid of revolution determinand, for example: can be with establishing as the x axle through solid of revolution determinand axis direction, the direction upwards is the y axle, and the body of revolution determinand axis and the nodical on surface can be selected to the origin of coordinates, and for reducing unnecessary work load when putting the gesture, the order of posture is put in the definition: pose 4 → pose 6 → pose 2 → pose 3 → pose 5 → pose 1;
a clamping step: a worker fixes a horizontal contact surface 9 of a clamp body 1 on a measuring table surface, a support part 5 of an object to be measured is placed on the clamp body 1, a placing position is selected through a position adjusting plate 4 and is fixed through a bolt and a nut, a hand wheel 11 is rotated to rotate a first screw 5-6, threads on the first screw 5-6 drive a screw sleeve 5-3 to rotate, the screw sleeve 5-3 drives a support block 5-5 of the object to be measured to move, the support block 5-5 of the object to be measured drives a sliding block 5-6 to move, and the sliding block 5-6 moves on a guide rail 5-8, so that the object 2 to be measured of a revolving body has a better placing environment;
the object to be tested rotator 2 is hoisted and placed on the object to be tested supporting part 5, the hand wheel 11 drives the pressing screw rod 10 to move by rotating the hand wheels 11 at the two ends of the object to be tested clamping part 6, the pressing screw rod 10 drives the pressing plate 6-3 to move, the pressing plate 6-3 drives the second screw rod 6-2 to move, the second screw rod 6-3 drives the clamping block 6-5 to move, the hand wheel 11 at the top of the second screw rod 6-2 drives the second screw rod 6-3 to move, the second screw rod 6-3 drives the clamping block 6-5 to move, and the object to be tested 2 can be fixed on the clamp body 1 more conveniently and quickly by matching with the hand wheel 11 at the top end of the pressing screw rod 10;
and changing the posture: and rotating a hand wheel 11 at the top end of the pressing screw rod 10, taking out the object to be tested clamping part 6, rotating the revolving body object to be tested 2 by a certain angle, and repeating the clamping step to sequentially place the posture six and the posture two. The vertical contact surface 7 and the 45-degree contact surface 8 on the clamp body 1 are respectively in fixed contact with the measuring table top, and all other postures of the revolving body object to be measured 2 can be placed. According to figures 7, 8 and 9, the various attitude schematics are represented as: schematic diagrams of pose four, pose six, and pose two are shown in fig. 7; schematic diagrams of pose three and pose five are shown in fig. 8; a schematic diagram of pose one is shown in fig. 9.
If the moment of inertia of the object 2 to be measured of the revolving body passing through any axis at the centroid is measured, the Euler angle conversion is carried out on the moment of inertia data of the measurement result.
Claims (9)
1. A special fixture for measuring rotational inertia of a revolving body is characterized by comprising a fixture body and a clamping device, wherein the clamping device is arranged on the fixture body, an object to be measured of the revolving body is clamped by the clamping device, and the fixture body is provided with a vertical contact surface, a 45-degree contact surface and a horizontal contact surface; the clamp body is fixedly connected with the measuring table through a vertical contact surface, a 45-degree contact surface and a horizontal contact surface respectively, so that the axis of the object to be measured of the revolving body forms 90 degrees, 45 degrees and 0 degrees with the measuring table respectively, and the placement of six postures of the object to be measured of the revolving body is realized;
the clamping device comprises a pair of clamping mechanisms which are symmetrically arranged, each clamping mechanism comprises an object to be tested supporting part and an object to be tested clamping part, the object to be tested supporting part is arranged on a position adjusting plate of the clamp body and can move on the position adjusting plate, and two ends of the object to be tested supporting part are respectively connected with the object to be tested clamping part through pressing screw rods; the rotary body object to be measured is clamped between the object supporting component and the object clamping component.
2. The special fixture for measuring rotational inertia of a revolving body according to claim 1, wherein the object-to-be-measured supporting member comprises a bottom plate of a slide rail, the bottom plate of the slide rail is provided with a guide rail, two ends of the guide rail are respectively provided with a slide block, each slide block is provided with an object-to-be-measured supporting block, the two object-to-be-measured supporting blocks are bilaterally symmetrical to form a V-shaped supporting block, a movable first lead screw is arranged in each object-to-be-measured supporting block, one end of the first lead screw is movably connected with the bearing block through a bearing, the other end of the first lead screw is provided with a lead screw sleeve, the lead screw sleeve is connected with a hand wheel through a bearing arranged on the bearing block, and the object-to-be-measured supporting blocks.
3. The special fixture for measuring the rotational inertia of the revolving body according to claim 1, wherein the object to be measured clamping part comprises a pressing plate, a second screw rod is arranged in the middle of the pressing plate, the pressing plate is in threaded connection with the second screw rod, and the end of one end of the second screw rod is connected with a hand wheel; the other end of the second screw rod is in clearance connection with the clamping block, and the end part of the second screw rod penetrates through the clamping block and is connected with the bolt through the gasket.
4. The special fixture for measuring the rotational inertia of a revolving body according to claim 1, wherein the top end of the pressing screw rod is respectively connected with both ends of the pressing plate and the screw thread, the top end of the pressing screw rod passes through the pressing plate and is connected with the hand wheel, and the bottom end of the pressing screw rod is fixedly connected with the bottom plate of the slide rail of the supporting component of the object to be measured.
5. The special fixture for measuring rotational inertia of a rotating body according to claim 2, wherein the supporting block of the object to be measured is provided with a buffer block.
6. The special fixture for measuring rotational inertia of a rotating body of claim 5, wherein the buffer block is made of a high-strength rubber material and is provided with a counter bore.
7. The special fixture for measuring rotational inertia of a body of revolution as claimed in claim 3, wherein the clamping block is a clamping block characterized by V-shaped groove and rectangular groove.
8. The special fixture for measuring rotational inertia of a revolving body according to claim 2, wherein two ends of the first lead screw are provided with positioning surfaces.
9. The special fixture for measuring the rotational inertia of the revolving body according to claim 1, wherein the revolving body object to be measured is cylindrical, conical, or a revolving body with characteristics of cylinder and cone, and a revolving body accessory with characteristics of edge strips and wings assembled on the surface; the diameter of the object to be measured of the revolving body is 50-300mm, and the length is 700-2500 mm.
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| CN202020826820.7U CN211855698U (en) | 2020-05-18 | 2020-05-18 | Special clamp for measuring rotational inertia of revolving body |
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| CN202020826820.7U CN211855698U (en) | 2020-05-18 | 2020-05-18 | Special clamp for measuring rotational inertia of revolving body |
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| CN211855698U true CN211855698U (en) | 2020-11-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114012622A (en) * | 2021-11-11 | 2022-02-08 | 昆山万丰达智能装备有限公司 | Many material numbers of piston rod carrier subassembly |
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2020
- 2020-05-18 CN CN202020826820.7U patent/CN211855698U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114012622A (en) * | 2021-11-11 | 2022-02-08 | 昆山万丰达智能装备有限公司 | Many material numbers of piston rod carrier subassembly |
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