CN109100107A - A kind of lateral slip three-dimensional force plate/platform - Google Patents
A kind of lateral slip three-dimensional force plate/platform Download PDFInfo
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- CN109100107A CN109100107A CN201810939658.7A CN201810939658A CN109100107A CN 109100107 A CN109100107 A CN 109100107A CN 201810939658 A CN201810939658 A CN 201810939658A CN 109100107 A CN109100107 A CN 109100107A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a kind of lateral slip three-dimensional force plate/platforms comprising wheel Chu Tai lateral sliding mechanism is arranged on three-dimensional force plate/platform；First and second X is set on three-dimensional force plate/platform to force sensor module, the first and second Y-direction force sensor module, the first, second and third Z-direction force sensor module, and the first X be orthogonal to a bit to the line of action of force sensor module and the second Z-direction force sensor module, the line of action of first Y-direction force sensor module and the first Z-direction force sensor module is orthogonal to a bit, and the 2nd X is orthogonal to a bit to the line of action of force sensor module, the second Y-direction force sensor module and third Z-direction force sensor module；Sliding plate is set through plane needle bearing in wheel Chu Tai lateral sliding mechanism, tension spring is arranged in the front end of sliding plate, and the Y-direction freedom degree of sliding plate is decontroled.The present invention is small to the coupling error of three-dimensional dynamic load real-time measurement and analysis under same time domain, measurement accuracy is high, can be used for various types aircraft and unmanned plane.
Description
Technical field
The present invention relates to the sliding force plate/platform of dropping shock load test, especially a kind of lateral slip three-dimensional is surveyed
Power platform.
Background technique
Three-dimensional landing load measurement in the Aircraft Landing Gear Drop Tests such as large and medium-sized transporter, passenger plane, fighter plane is universal
It is more demanding to sensor installation accuracy using 4 or 6 pressure resistance type three-dimensional force transducer distributed measurement technologies, it causes
Processing cost is high, artificial aging rate is low；This mode amplitude-frequency response is lower simultaneously, and range is larger, falls shake examination carrying out big function amount
It can be met the requirements substantially when testing, but for small function amount take-off and landing device, because product amplitude-frequency response is high, load measurement error is larger, no
It can effectively simulate and real embodiment product cushion performance.
Based on wheel in certain type unmanned plane leaf spring type main landing gear drop-test in lateral sliding and lateral sliding perimeter strip of rubbing
Lateral load measurement request under part, at home without application of result and Technique Popularizing on the basis of, thus it is necessary to set again
Count a kind of three-dimensional force plate/platform.
Summary of the invention
The technical problem to be solved by the present invention is in view of the shortcomings of the prior art, provide a kind of lateral slip three-dimensional survey
Power platform, three directional loads measurement when being able to achieve take-off and landing device impact test under the conditions of wheel lateral sliding.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of lateral slip three-dimensional force plate/platform,
Including three-dimensional force plate/platform, in which:
Wheel Chu Tai lateral sliding mechanism is fixedly connected on the three-dimensional force plate/platform；
The three-dimensional force plate/platform includes leveling base and impact table top, Z-direction between leveling base top and impact table top
The first and second X is fixedly installed in parallel to pass to force sensor module, the first and second Y-direction force sensor module, the first, second and third Z-direction power
Sensor component, and the first and second X to force sensor module X to be arranged in parallel and Z-direction height identical, the first and second Y-direction force snesor
Component Y-direction is arranged in parallel and Z-direction height is identical, and the first, second and third Z-direction force sensor module uniformly distributed and Z-direction on leveling base is high
Spend identical, the first X is orthogonal to a bit to the line of action of force sensor module and the second Z-direction force sensor module, the first Y-direction power
The line of action of sensor module and the first Z-direction force sensor module is orthogonal to a bit, and the 2nd X is to force sensor module, the 2nd Y
It is orthogonal to a bit to the line of action of force sensor module and third Z-direction force sensor module；
The X to, Y-direction, Z-direction refer to tri- directions X, Y, Z mutually orthogonal in three-dimensional cartesian coordinate system；
The wheel Chu Tai lateral sliding mechanism includes that bottom is fixedly connected with the impact table top of the three-dimensional force plate/platform
Switching bottom plate, one group of straight line plane needle bearing, the lower surface of a sliding plate and plane is fixedly installed along Y-direction on bottom plate of transferring
Needle bearing connects, setting reverse limit pin on the switching bottom plate before plane needle bearing, behind plane needle bearing
Switching bottom plate on positive limit pin is set, reverse limit pin connects sliding plate, and the Y-direction freedom degree of sliding plate through tension spring
It decontrols.
Fixed bottom plate is set in above scheme, at the top of the leveling base, the first two-way biography is fixedly installed on fixed bottom plate
Sensor bracket, the second bilateral transducer bracket, three-dimensional sensor stand, the first and second bilateral transducer bracket respectively include a Y-direction
Or X, to the horizontal supporting portion of setting and a relatively fixed vertically disposed column of bottom plate, three-dimensional sensor stand includes rectangular
Two horizontal supporting portions and relatively fixed vertically disposed two column of bottom plate being arranged, it is horizontally-supported that each column is respectively arranged at correspondence
The outer end in portion；It is bi-directionally connected block with the first bilateral transducer bracket corresponding position setting first on the lower end surface of the impact table top,
It is bi-directionally connected block with the second bilateral transducer bracket corresponding position setting second, three-dimensional is set with three bilateral transducer bracket corresponding positions
Link block；First is bi-directionally connected between one end of block and the column of the first bilateral transducer bracket and connects the first Y-direction power and pass
Sensor component, first is bi-directionally connected between the bottom of block and the horizontal supporting portion of the first bilateral transducer bracket and connects described first
Z-direction force sensor module；Second is bi-directionally connected between one end of block and the column of the second bilateral transducer bracket and connects described
To force sensor module, second is bi-directionally connected between the bottom of block and the horizontal supporting portion of the second bilateral transducer bracket and connects one X
Connect the second Z-direction force sensor module；Institute is set between one end of three-dimensional link block and a column of three-dimensional sensor stand
The second Y-direction force sensor module is stated, institute is set between the other end of three-dimensional link block and another column of three-dimensional sensor stand
The 2nd X is stated to force sensor module, is arranged between the bottom of three-dimensional link block and two horizontal supporting portions of three-dimensional sensor stand
The third Z-direction force sensor module.
In above scheme, first and second X is to force sensor module, the first and second Y-direction force sensor module, first and second,
The structure of three Z-direction force sensor modules it is identical and respectively include with first and second be bi-directionally connected that block or three-dimensional link block are connect
One oscillating bearing and the second joint bearing being connect with the first and second bilateral transducer bracket or three-dimensional sensor stand, first and second
Positive locking nut is sequentially set between oscillating bearing, adjusts connector, tension-compression sensor, reverse locking nut.
In above scheme, three guide-track grooves are set, bias embeds the plane needle roller in guide-track groove on the switching bottom plate
Bearing.
In above scheme, the decorative pattern of simulation road face characteristic is carved in the sliding plate upper surface, to simulate aircraft (unmanned plane)
The runway characteristic on airport when landing.
The present invention is based on cartesian coordinate systems, three-dimensional when realizing take-off and landing device impact test under the conditions of wheel lateral sliding
Load measurement.When impact vibration, take-off and landing device is fallen in the form of freely falling body along Z-direction (Fig. 1) vertically hits sliding plate, by quality
Inertia force, spring restoring force and structural damping power shake impact along Z-direction up and down, and it is flat in dynamometry to realize that energy consumption decays to take-off and landing device
Platform is static.In the case of band turns, force plate/platform measures X, Y and three directions of Z-direction in entire time domain, and by lateral (Y
To) sliding test require realize boundary condition under lateral load real time monitoring and measurement.The present invention is needed suitable for following tests
It asks:
1, telescopic landing gear or articulated landing gear drop-test three directional loads measurement request are used for；
2, laterally there is larger displacement for airplane wheel, slide simulation test；
3, the sliding drop-test for the release of leaf spring type undercarriage lateral load；
4, fall or impact side load test for other forms.
Compared with prior art, advantage for present invention is as follows:
Three-dimensional sliding force plate/platform coupling error of the present invention is small, measurement accuracy is high, solves small dimension undercarriage, unmanned plane
The drop-test three directional loads testing requirement of undercarriage meets the drop-test testing requirement of lateral load release, while lateral
Sliding technology can also be used for the requirement that product dropping shock is tested in large and medium-sized Aircraft Landing Gear Drop Test and other industry.
Detailed description of the invention
Fig. 1 is the lateral slip three-dimensional force plate/platform structure chart of the present invention.
Fig. 2 is three-dimensional force plate/platform structure chart of the present invention.
Fig. 3 is load cell assembly assumption diagram of the present invention.
Fig. 4 is lateral sliding mechanism structure figure of the present invention.
Fig. 5 is X, Y, Z-direction three orthogonal force snesor scheme of installation.
Fig. 6 is the orthogonal stress isoboles of the lateral slip three-dimensional force plate/platform of the present invention.
In figure:
1. three-dimensional force plate/platform；11. leveling base；12. fixed bottom plate；13. the first bilateral transducer bracket；14.Y is to spiral shell
Bolt fastener；15. the first Y-direction force sensor module；15 ' the second Y-direction force sensor modules；16. first is bi-directionally connected block；17.
Impact table top；18.Z is to bolt fastener；19. three-dimensional link block；110. three-dimensional sensor stand；111. second is bi-directionally connected
Block；112. the first X is to force sensor module；The 2nd X of 112 ' is to force sensor module；113. course bolt fastener；114. the
One Z-direction force sensor module；114 ' the second Z-direction force sensor modules；114 ", third Z-direction force sensor module；115. second
Bilateral transducer bracket；
2. wheel Chu Tai lateral sliding mechanism；21. bottom plate of transferring；22. sliding plate；23. tension spring；24. reverse limit
Pin；25. plane needle bearing；26 bearing supporting frames；27. positive limit pin；
31. the first oscillating bearing；32. positive locking nut；33. adjusting connector；34. tension-compression sensor；35. reverse locking
Nut；36. second joint bearing.
Specific embodiment
As shown in Figure 1, the lateral slip three-dimensional force plate/platform of the present invention includes three-dimensional force plate/platform 1 and is connected through a screw thread
Wheel Chu Tai lateral sliding mechanism 2 on three-dimensional force plate/platform 1, not only can measure when drop-test course (X to) load and
Vertical (Z-direction) load, can also lateral (Y-direction) load of real-time measurement wheel, and can authentic and valid simulation road face frictional behavior.
As shown in Fig. 2, three-dimensional force plate/platform 1 includes leveling base 11 and impact table top 17.It is arranged at the top of leveling base 11
The first bilateral transducer bracket 13 is fixedly installed along Y-direction on one jiao of fixed bottom plate 12 in fixed bottom plate 12, along relative angle along X to
Second bilateral transducer bracket 115 is set, three-dimensional sensor stand 110, the first and second bilateral transducer bracket are set in the third angle
13,115 a Y-direction or X are respectively included to the horizontal supporting portion of setting and a relatively fixed vertically disposed column of bottom plate 12, three-dimensional
Sensor stand 110 includes two horizontal supporting portions being at right angles arranged and fixes vertically disposed two column of bottom plate 12 relatively, respectively
Column is respectively arranged at the outer end of corresponding horizontal supporting portion.Impact table top 17 lower end surface on the first bilateral transducer bracket 13
Corresponding position setting first is bi-directionally connected block 16, is bi-directionally connected block with 115 corresponding position of the second bilateral transducer bracket setting second
111, three-dimensional link block 119 is set with three bilateral transducer brackets, 116 corresponding position.First is bi-directionally connected one end and first of block 16
The first Y-direction force sensor module 15 is connected through Y-direction bolt fastener 14 between the column of bilateral transducer bracket 13, first is two-way
Through the connection of Z-direction bolt fastener 18 first between the bottom of link block 16 and the horizontal supporting portion of the first bilateral transducer bracket 13
Z-direction force sensor module 114.Second is bi-directionally connected between one end of block 111 and the column of the second bilateral transducer bracket 115 and passes through
X connects the first X to force sensor module 112 to bolt fastener 113, and second is bi-directionally connected the bottom of block 111 and second two-way
The second Z-direction force sensor module 114 ' is connected between the horizontal supporting portion of sensor stand 115.One end of three-dimensional link block 119
Second Y-direction force sensor module 15 ' is set between a column of three-dimensional sensor stand 110, three-dimensional link block 119 it is another
2nd X is set between end and another column of three-dimensional sensor stand 110 to force sensor module 112 ', three-dimensional link block 119
Bottom and three-dimensional sensor stand 110 two horizontal supporting portions between be arranged third Z-direction force sensor module 114 ".The first,
Two X are mutually put down respectively to force sensor module, the first and second Y-direction force sensor module, the first, second and third Z-direction force sensor module
Row, and vertical height is consistent, the first, second and third Z-direction force sensor module is being evenly distributed in fixed bottom plate 12, to ensure in calibration
Either direction realizes that coupling error is controllable between effectively measurement and load, and after wheel touches platform, three direction sensors pair
Three-dimensional orthogonal load realizes independent measurement.
First and second X is to force sensor module, the first and second Y-direction force sensor module, the first, second and third Z-direction force snesor group
The structure of part is identical, in the present embodiment, refers to the first and second X to force sensor module, the first and second Y with force-measuring sensing device assembly
To force sensor module, any of the first, second and third Z-direction force sensor module, and structure explanation is carried out to it.
As shown in figure 3, force-measuring sensing device assembly include with first and second be bi-directionally connected that block or three-dimensional link block are connect first
Oscillating bearing (internal screw thread) 31 and the second joint bearing being connect with the first and second bilateral transducer bracket or three-dimensional sensor stand
Positive locking nut 32 is sequentially arranged between first and second oscillating bearing 31,36, adjusts connector 33, tension and compression sensing for (external screw thread) 36
Device 34, reverse locking nut 35, forward and reverse adjustment, positive locking nut 32 and reverse locking nut 35 can be realized by adjusting connector 33
It can avoid force-measuring sensing device assembly play, two connecting pins can effectively avoid used in measurement process using the first and second oscillating bearing
Property coupling.In use, entire component is bi-directionally connected block by first and second that the first oscillating bearing 31 connects three-dimensional force plate/platform 1
Or three-dimensional link block, the first and second bilateral transducer bracket or three-dimensional sensor stand are connected by second joint bearing 36, coordinated
Ensure that tension-compression sensor 34 is subjected only to tension and compression deformation after assembly, to reduce the coupling between three-dimensional sensor (X, Y, Z-direction sensor)
Close error.
As Figure 1 and Figure 4, wheel Chu Tai lateral sliding mechanism 2 includes the impact table top of bottom and three-dimensional force plate/platform 1
Three guide-track grooves are arranged on bottom plate 21 of transferring in the 17 switching bottom plates 21 through being threadedly coupled, eccentric in guide-track groove to embed one group of straight line
The lower surface of plane needle bearing 25, sliding plate 22 is contacted with plane needle bearing 25.The guide-track groove peace transferred on bottom plate 21
Face needle bearing 25 is arranged along Y-direction, is respectively set reversely at the rear and front end of corresponding flat needle bearing 25 on bottom plate 21 of transferring
Spacer pin 24 and positive limit pin 27, reverse limit pin 24 connects sliding plate 22 through tension spring 23, and sliding plate 22 is along guide rail
Slot direction freedom degree is decontroled.The decorative pattern of simulation road face characteristic is carved on sliding plate 22.Y-direction (lateral sliding direction) load passes through cunning
It moves plate 22 to be slided along guide-track groove direction to measure lateral load, sliding load is controlled by the tensioned power of tension spring 23, sliding
Distance is moved to be limited by the reverse limit pin 24 and positive limit pin 27 at 21 both ends of switching bottom plate.After wheel tire touches platform, three
When measuring to orthogonal load, X is measured to Z-direction by the force-measuring sensing device assembly of respective direction, Y-direction (lateral sliding direction)
When measurement, sliding plate sliding reduces force of sliding friction, and real-time measurement is monitored by Y-direction force-measuring sensing device assembly.
Fall or impact test in, measured object directly contacts slip three-dimensional force plate/platform upper surface of the invention lateral, 7
A sensor realizes the measurement of three axis force, dynamically measures three directional loads in time domain by collector, host computer and draws curve,
Data storage, playback.
As shown in figure 5, X, Y and three force-measuring sensing device assembly one end of Z-direction are connected by link block and three-dimensional force plate/platform 1
It connects, force value position is met at a bit；The other end is connected on the three-dimensional sensor stand in corresponding three directions, guarantees three dynamometry
Sensor module is mutually orthogonal.
As shown in fig. 6, A, B, C are original installation point in X, Y and the analysis signal of the load-transfer mechanism of Z-direction, after carrying, B point is moved
It is 0.5mm, sensor to full scale deflection ≯ 0.5mm to B', moving distance L1.Definition BA is course (X to), and course is mobile
Distance L2 is 213mm, and CB is lateral (Y-direction),Course and lateral load interference value are as follows:
Fx'sin0.13 °=Fx'0.0023, coupling error is about 2 ‰, and so on, the coupling in entire force plate/platform measurement of the present invention
Closing error is 2 ‰, meanwhile, force plate/platform guarantees required precision in assembly, and effective by the first and second oscillating bearing of earrings shape
Reduce the force value coupling error in other directions.
After lateral slip three-dimensional force plate/platform of the invention is completed, actual precision index is verified,
Course marks are to 30KN, and vertical mark to 30KN, laterally mark arrives 20KN, and practical nominal data is shown in Table 1.It may know that from nominal data, power
Value principal direction precision, three directions coupling accuracy be respectively less than 5 ‰.
The practical calibration numerical value of table 1
Claims (5)
1. a kind of lateral slip three-dimensional force plate/platform, including three-dimensional force plate/platform (1), which is characterized in that
Wheel Chu Tai lateral sliding mechanism (2) is fixedly connected on the three-dimensional force plate/platform；
The three-dimensional force plate/platform includes leveling base (11) and impact table top (17), between leveling base top and impact table top
Z-direction be fixedly installed in parallel the first and second X to force sensor module (112,112 '), the first and second Y-direction force sensor module (15,
15 '), the first, second and third Z-direction force sensor module (114,114 ', 114 ' '), and the first and second X is to force sensor module X to flat
Row is arranged and Z-direction height is identical, and the first and second Y-direction force sensor module Y-direction is arranged in parallel and Z-direction height is identical, and first, second and third
Z-direction force sensor module uniformly distributed and Z-direction height on leveling base is identical, and the first X is passed to force sensor module and the second Z-direction power
The line of action of sensor component is orthogonal to a bit, the active force of the first Y-direction force sensor module and the first Z-direction force sensor module
Line is orthogonal to a bit, and the 2nd X is to force sensor module, the work of the second Y-direction force sensor module and third Z-direction force sensor module
It is orthogonal to a bit with the line of force；
The X to, Y-direction, Z-direction refer to tri- directions X, Y, Z mutually orthogonal in three-dimensional cartesian coordinate system；
The wheel Chu Tai lateral sliding mechanism includes turn that bottom is fixedly connected with the impact table top of the three-dimensional force plate/platform
It connects bottom plate (21), one group of straight line plane needle bearing (25), the following table of a sliding plate (22) is fixedly installed along Y-direction on bottom plate of transferring
Face and plane needle bearing connect, and reverse limit pin (24) are arranged on the switching bottom plate before plane needle bearing, plane
Positive limit pin (27) are set on the subsequent switching bottom plate of needle bearing, reverse limit pin is connected through tension spring (23) and slid
Plate, and the Y-direction freedom degree of sliding plate is decontroled.
2. a kind of lateral slip three-dimensional force plate/platform according to claim 1, which is characterized in that the leveling base top
Portion is arranged fixed bottom plate (12), and the first bilateral transducer bracket (13), the second bilateral transducer branch is fixedly installed on fixed bottom plate
Frame (115), three-dimensional sensor stand (110), the first and second bilateral transducer bracket respectively include the level of a Y-direction or X to setting
Support portion and a relatively fixed vertically disposed column of bottom plate, three-dimensional sensor stand include at right angles be arranged it is two horizontally-supported
Portion and relatively fixed vertically disposed two column of bottom plate, each column are respectively arranged at the outer end of corresponding horizontal supporting portion；The punching
It hits on the lower end surface of table top and is bi-directionally connected block (16) with the first bilateral transducer bracket corresponding position setting first, with the second two-way biography
Sensor bracket corresponding position setting second is bi-directionally connected block (111), and three-dimensional link block is arranged with three bilateral transducer bracket corresponding positions
(119)；First is bi-directionally connected between one end of block and the column of the first bilateral transducer bracket and connects the first Y-direction power sensing
Device assembly, first is bi-directionally connected between the bottom of block and the horizontal supporting portion of the first bilateral transducer bracket and connects the first Z
To force sensor module；Second is bi-directionally connected between one end of block and the column of the second bilateral transducer bracket and connects described first
To force sensor module, second is bi-directionally connected between the bottom of block and the horizontal supporting portion of the second bilateral transducer bracket and connects X
The second Z-direction force sensor module；Between one end of three-dimensional link block and a column of three-dimensional sensor stand described in setting
Second Y-direction force sensor module, between the other end of three-dimensional link block and another column of three-dimensional sensor stand described in setting
Institute is arranged between the bottom of three-dimensional link block and two horizontal supporting portions of three-dimensional sensor stand to force sensor module in 2nd X
State third Z-direction force sensor module.
3. a kind of lateral slip three-dimensional force plate/platform according to claim 1, which is characterized in that first and second X to
The structure of force sensor module, the first and second Y-direction force sensor module, the first, second and third Z-direction force sensor module is identical and distinguishes
Including with first and second be bi-directionally connected the first oscillating bearing (31) that block or three-dimensional link block are connect and with the first and second two-way sensing
Device bracket or the second joint bearing (36) of three-dimensional sensor stand connection, sequentially setting is positive between the first and second oscillating bearing
Locking nut (32) adjusts connector (33), tension-compression sensor (34), reverse locking nut (35).
4. a kind of lateral slip three-dimensional force plate/platform according to claim 1, which is characterized in that on the switching bottom plate
Three guide-track grooves are set, and bias embeds the plane needle bearing in guide-track groove.
5. a kind of lateral slip three-dimensional force plate/platform according to claim 1, which is characterized in that table on the sliding plate
It is carved with the decorative pattern of simulation road face characteristic in face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810939658.7A CN109100107B (en) | 2018-08-17 | 2018-08-17 | Lateral slidable three-dimensional force measuring platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810939658.7A CN109100107B (en) | 2018-08-17 | 2018-08-17 | Lateral slidable three-dimensional force measuring platform |
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| Publication Number | Publication Date |
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| CN109100107A true CN109100107A (en) | 2018-12-28 |
| CN109100107B CN109100107B (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810939658.7A Active CN109100107B (en) | 2018-08-17 | 2018-08-17 | Lateral slidable three-dimensional force measuring platform |
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| CN (1) | CN109100107B (en) |
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| CN111516899A (en) * | 2020-04-30 | 2020-08-11 | 中国飞机强度研究所 | Large-size high-range reinforced concrete table force measuring device, system and method |
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| CN107884108A (en) * | 2017-11-30 | 2018-04-06 | 江西洪都航空工业集团有限责任公司 | A kind of triaxial residual stresses based on uniaxially pull pressure sensor |
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| CN103308233A (en) * | 2013-06-17 | 2013-09-18 | 中国飞机强度研究所 | Three-dimensional force measuring platform device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109100107B (en) | 2020-06-30 |
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