CN104034478B - The support arrangement that in centroid measurement, ball-and-socket, needling, plane combine - Google Patents
The support arrangement that in centroid measurement, ball-and-socket, needling, plane combine Download PDFInfo
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- CN104034478B CN104034478B CN201410305090.5A CN201410305090A CN104034478B CN 104034478 B CN104034478 B CN 104034478B CN 201410305090 A CN201410305090 A CN 201410305090A CN 104034478 B CN104034478 B CN 104034478B
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Abstract
The support arrangement that in centroid measurement, ball-and-socket, needling, plane combine, it relates to a kind of supporting construction, ball-ball-and-socket supporting methods presence sensor to solve existing centroid measurement is extremely difficult to be automatically adjusted to and supporting point centering, there is the problem that guiding frictional force is big in center position low precision and ball planar support method, it includes ball-and-socket supporting construction, ball plane supporting structure and measures pedestal；Described support arrangement also includes needling supporting construction；Described needling supporting construction includes needling plate, steel ball, ball seat, bearing sensor, bearing sensor pallet and base, bearing sensor pallet is provided with bearing sensor, bearing sensor pallet is rotatably installed on base, floor installation is being measured on pedestal, ball seat is removably mounted in bearing sensor, the middle part of the upper surface of ball seat is placed with steel ball, and steel ball top is placed with horizontally disposed needling plate。The present invention is used for large scale aircraft centroid measurement。
Description
Technical field
The present invention relates to a kind of supporting construction, be specifically related to the supporting construction of a kind of large scale aircraft centroid measurement equipment。
Background technology
The supporting way of large scale aircraft centroid measurement equipment, the problem of side force exists always, affects certainty of measurement。Be directly affects the measurement result of quality center of mass by the measured value of the output valve of the known sensor of the ultimate principle of multipoint method and force acting on transducer point position, so how ensure that the accuracy of sensor output value and center sensor stress point position measurements becomes the key factor improving quality center of mass test desk certainty of measurement。The supporting construction of sensor is the key factor affecting Sensor Output Characteristic and force acting on transducer point position。
At present, the impact on barycenter measurement result of the sensor support mode,
Principal element for affecting sensor output value precision quality center of mass test desk has:
Sensor data acquisition module is subject to electrical Interference, causes gathering data unstable；
Software data processes unreasonable, affects certainty of measurement；
, there is side force, cause that measurement result has deviation in measurement bracket supporting point and the non-centering of center sensor stress point。
The main cause affecting force acting on transducer point positional accuracy measurement has:
Coordinate measurment instrument precision limits；
Measures process and there is human users's error；
Measurement bracket supporting point and center sensor stress point not on same vertical line, the transverse axis X of the supporting point position recorded, longitudinal axis Y-direction coordinate be not the coordinate of the transverse axis X of center sensor stress point, longitudinal axis Y-direction。
From the above analysis it can be seen that the factor affecting precision mainly has measurement instrument, software, electromagnetic interference, sensor support mechanism etc.。The precision problem of instrument can pass through to change high-precision instrument and solve, software processes problem can be modified program and improve precision, electromagnetic interference can be solved by screening arrangement, all it is easier when these problems occur to solve, if but there is non-centering problem in supporting point and center sensor stress point, then is difficult to solve。Because the frame for movement volume of quality center of mass test desk is big, cost is high, process-cycle is long, it is difficult to after being completed modify again, so the Design of Mechanical Structure principle of sensor support structure must be proved before mechanical machining scrupulously according to measurement requirement, the sensor support structure distributing position accurately calculated and maching dimension, ensure that itself and center sensor o'clock are on a vertical line, reduce measurement error as far as possible。
At present, it is ball-ball-and-socket supporting methods and ball-planar support method based on the centroid measurement platform of multipoint method is applied the supporting way of more measurement bracket and sensor。
Ball-ball-and-socket supporting methods: ball-ball-and-socket supporting construction is as Figure 1-Figure 2, generally it is made up of sensor support structure (base, thrust ball bearing, bearing block), sensor, pressure steel ball seat, steel ball and ball-and-socket, the size of ball-and-socket and ball must is fulfilled for certain relation, energy freely-movable, again can sensitive playback to the heart, sensor base places friction when thrust ball bearing reduces sensor movement with base。When steel ball generation side force, ball can band dynamic sensor do level move about, thus eliminating side force, make supporting point and center sensor stress point centering。
Ball-ball-and-socket supporting construction frame for movement is simpler, it is easy to realize, and sensor centering is relatively flexible, can meet general measurement requirement, and Application comparison is extensive。But in actual measurement process, impact due to some factors such as frame for movement deformation, machining accuracy, installation leveling precision, three sensor levels simultaneously are travelling and dumb, sensor is difficult to arrive and is automatically adjusted to and the perfect condition of supporting point centering, measurement requirement is not still reached for required precision better quality center mass measuring device, and after improvement, precision raising is not as obvious。
Ball-planar support method: the structure of ball-planar support method, as it is shown on figure 3, be made up of sensor support structure, sensor, steel ball seat and steel ball, uses this method for supporting must coordinate lead, as shown in the figure。The sensor of ball-planar support method is directly placed on pallet and base, it is fixed on test desk base together, measurement process can not free level be moved about, owing to steel ball and measurement bracket contact portion are plane, steel ball is without constraint, for preventing measurement bracket and product lateral deviation to be measured, the elevating lever of elevating mechanism is installed lead, the position of fixation measuring support。
In ball-planar support method, the side force impact of ball-and-socket do not gone up by steel ball, and steel ball skid force is little, it is easier to realizing supporting point and the centering of center sensor stress point, Machine Design industry is simple, it is easy to realize；But when measurement bracket generation lateral deviation, although lead serves positioning action, but also create very big frictional force, the serious measured value precision that have impact on sensor。That this method uses in current measurement and few。
Summary of the invention
The present invention is extremely difficult to be automatically adjusted to and supporting point centering for solving the ball of existing centroid measurement-ball-and-socket supporting methods presence sensor, there is the problem that guiding frictional force is big in center position low precision and ball-planar support method, and then provides the support arrangement that ball-and-socket, needling, plane in a kind of centroid measurement combine。
The present invention solves that the problems referred to above adopt the technical scheme that: the support arrangement that in the centroid measurement of the present invention, ball-and-socket, needling, plane combine includes ball-and-socket supporting construction, ball plane supporting structure and measures pedestal；Described support arrangement also includes needling supporting construction, and ball-and-socket supporting construction, needling supporting construction and ball plane supporting structure are that isosceles triangle is arranged on measurement pedestal；Described needling supporting construction includes needling plate, steel ball, ball seat, bearing sensor, bearing sensor pallet and base, bearing sensor pallet is provided with bearing sensor, bearing sensor pallet is rotatably installed on base, floor installation is being measured on pedestal, ball seat is removably mounted in bearing sensor, the middle part of the upper surface of ball seat is placed with steel ball, steel ball top is placed with horizontally disposed needling plate, the lower surface of needling plate processes the groove that cross section is semicircular arc along its length, and steel ball acts against on groove。
The invention has the beneficial effects as follows: ball-ball-and-socket, needling-planar support method adopts supported at three point method, three sensors are arranged on base by isosceles triangle, each sensor is different from the way of contact of measurement bracket, has been respectively adopted plane, structure that three kinds of degree of flexibility of ball-and-socket and needling are different。The sensing station of plane supporting structure need not adjust, it is possible to use steel ball freely-movable in the plane realizes the strong point and center sensor automatic centering, and centering process is very fast；Ball-and-socket supporting construction improves the motility of the horizontal swimming characteristics of sensor, and the side force caused for measurement bracket and product to be measured can overcome by the level of sensor is travelling；In order to solve the measurement bracket sideslip problem that ball-planar structure causes, do not increase again system friction, devise needling structure, reduce the lateral deviation power of test desk；And use laser tracker to measure the supporting point coordinate of three sensors, substantially increase the precision of measurement。The point of three kinds of different structures carries out automatic centering process simultaneously, and mutual constraints reduces, and centering process time shortens, and the precision of centering greatly improves。
The perfect condition measured is for when test desk drops on steel ball, if the contact point of three kinds of ball-and-sockets and steel ball and center sensor stress point are on same vertical line, then the measured value of sensor and the positional accuracy measurement of supporting point are the highest。
Ball-ball-and-socket-needling-planar support method structure three-dimensional figure is as shown in Figure 6。Measurement value sensor can pass through the acquisition module output displays such as weighing instrument, when measuring center sensor stress point position coordinates, the visible anchor point designed in advance on test desk is measured first with laser tracker, then Coordinate Conversion is utilized to calculate sensor center position coordinate, the above-mentioned measurement being prior art。The present invention adopts the free supported at three point mode without side force of ball-and-socket, needling and plane, it is ensured that the uniqueness of application point and repeatability, it is achieved freely without the automatic centering of side force。
Accompanying drawing explanation
Fig. 1 is the perspective view of ball in background technology-ball-and-socket supporting construction, Fig. 2 is the exploded view of Fig. 1, Fig. 3 is the perspective view of ball-plane supporting structure in background technology, Fig. 4 is the perspective view of ball-needling supporting construction, Fig. 5 is the measurement bracket schematic diagram that can install the needling of lead, ball-and-socket and plane supported at three point, and Fig. 6 is the perspective view of the present invention。
Detailed description of the invention
Detailed description of the invention one: illustrate in conjunction with Fig. 4-Fig. 6, the support arrangement that in the centroid measurement of present embodiment, ball-and-socket, needling, plane combine includes ball-and-socket supporting construction 1, ball plane supporting structure 2 and measures pedestal 3；Described support arrangement also includes needling supporting construction 4, and ball-and-socket supporting construction 1, needling supporting construction 4 and ball plane supporting structure 2 are arranged in isosceles triangle on measurement pedestal 3；Described needling supporting construction 4 includes needling plate 4-1, steel ball 4-2, ball seat 4-3, bearing sensor 4-4, bearing sensor pallet 4-5 and base 4-7, bearing sensor pallet 4-5 is provided with bearing sensor 4-4, bearing sensor pallet 4-5 is rotatably installed on base 4-7, base 4-7 is arranged on measurement pedestal 3, ball seat 4-3 is removably mounted on bearing sensor 4-4, the middle part of the upper surface of ball seat 4-3 is placed with steel ball 4-2, steel ball 4-2 top is placed with horizontally disposed needling plate 4-1, the lower surface of needling plate 4-1 processes the groove 4-6 that cross section is semicircular arc along its length, steel ball 4-2 acts against on groove 4-6。
The preferential summit as isosceles triangle of ball-and-socket supporting construction 1 in present embodiment, the middle part processing of the upper surface of the ball seat of present embodiment has the hemispherical groove placing steel ball。
Detailed description of the invention two: measuring pedestal 3 described in present embodiment is circular table base。So arrange, meet design requirement and actual centroid measurement needs。Other is identical with detailed description of the invention one。
Detailed description of the invention three: illustrate in conjunction with Fig. 6, measuring pedestal 3 described in present embodiment is rectangle pedestal。So arrange, meet design requirement and actual centroid measurement needs。Other is identical with detailed description of the invention one。
Detailed description of the invention four: in conjunction with Fig. 5 explanation, support arrangement described in present embodiment also includes measurement bracket 5, and the upper surface of the needling plate 4-1 of the upper surface of ball-and-socket plate 1-1 of ball-and-socket supporting construction 1, the upper surface of flat board 2-1 of ball plane supporting structure 2 and needling supporting construction 4 is all connected with measurement bracket 5。So arrange, the needs that quality center of mass is measured can be met。Other with detailed description of the invention one, two or three identical。
Detailed description of the invention five: illustrating in conjunction with Fig. 4 and Fig. 6, the bearing sensor pallet 4-5 of present embodiment is rotatably installed on base 4-7 by bearing。So arranging, thrust ball bearing preferentially selected by present embodiment bearing, and thrust ball bearing is placed in sensor tray bottom, greatly reduces the friction with bearing sensor pallet when bearing sensor is moved。Other is identical with detailed description of the invention four。
Claims (5)
1. the support arrangement that in centroid measurement, ball-and-socket, needling, plane combine, it includes ball-and-socket supporting construction (1), ball plane supporting structure (2) and measures pedestal (3)；It is characterized in that: described support arrangement also includes needling supporting construction (4), ball-and-socket supporting construction (1), needling supporting construction (4) and ball plane supporting structure (2) are arranged in isosceles triangle in measurement pedestal (3)；Described needling supporting construction (4) includes needling plate (4-1), steel ball (4-2), ball seat (4-3), bearing sensor (4-4), bearing sensor pallet (4-5) and base (4-7), bearing sensor pallet (4-5) is provided with bearing sensor (4-4), bearing sensor pallet (4-5) is rotatably installed on base (4-7), base (4-7) is arranged in measurement pedestal (3), ball seat (4-3) is removably mounted in bearing sensor (4-4), the middle part of the upper surface of ball seat (4-3) is placed with steel ball (4-2), steel ball (4-2) top is placed with horizontally disposed needling plate (4-1), the lower surface of needling plate (4-1) processes the groove (4-6) that cross section is semicircular arc along its length, steel ball (4-2) acts against on groove (4-6)。
2. the support arrangement that in centroid measurement according to claim 1, ball-and-socket, needling, plane combine, it is characterised in that: described measurement pedestal (3) is circular table base。
3. the support arrangement that in centroid measurement according to claim 1, ball-and-socket, needling, plane combine, it is characterised in that: described measurement pedestal (3) is rectangle pedestal。
4. the support arrangement that in the centroid measurement according to claim 1,2 or 3, ball-and-socket, needling, plane combine, it is characterized in that: described support arrangement also includes measurement bracket (5), the upper surface of the needling plate (4-1) of the ball-and-socket plate (1-1) of ball-and-socket supporting construction (1), the flat board (2-1) of ball plane supporting structure (2) and needling supporting construction (4) is all connected with measurement bracket (5)。
5. the support arrangement that in centroid measurement according to claim 4, ball-and-socket, needling, plane combine, it is characterised in that: bearing sensor pallet (4-5) is rotatably installed on base (4-7) by bearing。
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| CN201410305090.5A CN104034478B (en) | 2014-06-30 | 2014-06-30 | The support arrangement that in centroid measurement, ball-and-socket, needling, plane combine |
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| CN201410305090.5A CN104034478B (en) | 2014-06-30 | 2014-06-30 | The support arrangement that in centroid measurement, ball-and-socket, needling, plane combine |
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| CN106248299B (en) * | 2016-07-11 | 2019-01-18 | 上海卫星装备研究所 | One kind being based on multi-dimensional force mass center test macro |
| CN107356371A (en) * | 2017-07-07 | 2017-11-17 | 哈尔滨工业大学 | Gothicism groove support meanss in a kind of centroid measurement equipment |
| CN108063343B (en) * | 2017-12-06 | 2019-10-22 | 哈尔滨工业大学 | A kind of cable automatic plug-pull device for quality center of mass measurement |
| CN110857882B (en) * | 2018-08-23 | 2021-07-02 | 中国石油天然气股份有限公司 | Balance support device |
| CN111707414B (en) * | 2020-06-23 | 2022-05-27 | 重庆大学 | Weighbridge type large heavy aircraft mass and mass center measuring device and method |
| CN116147499B (en) * | 2023-01-13 | 2023-09-01 | 北京航天计量测试技术研究所 | Device for measuring length and mass center of conical workpiece |
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| DE10021491B4 (en) * | 2000-05-03 | 2008-07-31 | Brueninghaus Hydromatik Gmbh | Method and device for determining the center of gravity of an attachable workpiece, in particular a piston machine |
| CN1435682A (en) * | 2002-10-25 | 2003-08-13 | 贺良 | Three-point weighing type static balance |
| CN103091042B (en) * | 2011-11-07 | 2016-11-16 | 泰州市宏华冶金机械有限公司 | Gravity center measurement device and center of gravity measurement method |
| CN103712745B (en) * | 2013-12-26 | 2016-03-23 | 哈尔滨工业大学 | Helicopter rotor blade center of gravity parameter measuring apparatus and method |
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