CN203551194U - Dead weight-type torque-measuring apparatus capable of independently loading and unloading counterweight - Google Patents
Dead weight-type torque-measuring apparatus capable of independently loading and unloading counterweight Download PDFInfo
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- CN203551194U CN203551194U CN201320703739.XU CN201320703739U CN203551194U CN 203551194 U CN203551194 U CN 203551194U CN 201320703739 U CN201320703739 U CN 201320703739U CN 203551194 U CN203551194 U CN 203551194U
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Abstract
A dead weight-type torque-measuring apparatus capable of independently loading and unloading a counterweight belongs to the technical field of metering test. The object of the utility model is to solve problems that the acceleration speed is slow, controlling devices are complex, operation is difficult and automation is hard to achieve in the prior art. The dead weight-type torque-measuring apparatus capable of independently loading and unloading the counterweight comprises a supporting device, a loading device fixed on the upper surface of the supporting device, a torque installation part connected with a guide rail slide block and a nut supporting seat of the loading device, a leveling device connected with one end of a long shaft of the torque installation part and automatic loading devices fixed at two ends of the leveling device. Each automatic loading device adopts a stepping motor B to drive an eccentric wheel to do rotary motions. The eccentric wheel drives a pallet to do linear elevation to achieve automatic loading and unloading of the counterweight. The dead weight-type torque-measuring apparatus capable of independently loading and unloading the counterweight adopts the stepping motors to drive the eccentric wheel to do rotary motions so as to achieve automatic loading and unloading of any number of the counterweights, and thus measurement of different torques can be achieved, and the motor driving structure is simple.
Description
Technical field
The utility model belongs to metrological testing technology field, relates to a kind of calibration and demarcation for detection of equipment such as standard torquemeter, torque sensor, dial torque wrenches, is specifically related to a kind of independently adding to unload counterweight dead weight type safe torque-measuring apparatus.
Background technology
Moment of torsion is one of the basic measurement value in mechanical meaurement field.Torque measurement is not only closely connected with our daily economic life, in national defence, and military affairs, space industry is also indispensable.For whether the accuracy of detection load sensor meets, measure requirement, will to it, carry out accuracy detection by force use value measurement mechanism.And assembling work is also requisite flow chart in large-scale aviation.In order to guarantee the consistance of assembling work, and can improve the quality of products, utilize that torque tool control is bolted to be preloaded, be current method in the assembling works such as, caulking joint fastening at parts, overlap joint.In the fields such as national defence weapon equipment, moment of torsion is also the important parameter of equipment dynamic performance detecting, test.
More common moment of torsion standard test fixture has standard torquer, the standard torquer of lever amplification structure and the standard torquer of hydraulic pressure structure for amplifying of dead weight type safe structure at present.For the standard torquer of lever amplification structure and the standard torquer of hydraulic pressure structure for amplifying, be all applicable to calibrate compared with high pulling torque.General lever torque standard device and fluid pressure type torque standard device all need to carry out trim when calibration operation, the balance of confining force standard set-up loading end and counterweight end when loading force value not, and trim is mainly at counterweight end cheek weight.This method is mainly because general lever power standard set-up is mainly that power value is amplified, and in the trim of counterweight end, can reach balance with the less weight standard set-up of just exerting all one's strength.Dead weight type safe standard torquer is by the leveling arrestment mechanism of the lever rotation center output torque of constant brachium, principle of work is simple, load rapidly, corresponding use is wider, traditional dead weight type safe standard torquer adds the reasons such as the complex structure of release mechanism, the high cost that counterweight adds release mechanism due to counterweight, cause existing that loading velocity is slow, control device is complicated, operating difficulties and be difficult to realize the problem of robotization.
Utility model content
The purpose of this utility model is to propose a kind of independently adding and unloads counterweight dead weight type safe torque-measuring apparatus, and the loading velocity that solves prior art existence is slow, control device is complicated, operating difficulties and be difficult to realize the problem of robotization.
For achieving the above object, of the present utility model independently adding, unloads counterweight dead weight type safe torque-measuring apparatus and comprises:
Bracing or strutting arrangement, described bracing or strutting arrangement is square frame;
Be fixed on the loading attachment of described bracing or strutting arrangement upper surface, described loading attachment comprises stepper motor A, ball-screw, feed screw nut, nut support seat, slide rail and guide rail slide block, described slide rail is fixed on the upper surface of described bracing or strutting arrangement, slide rail and guide rail slide block form moving sets, described ball-screw and feed screw nut form screw pair, described feed screw nut is connected with described slide block by nut support seat, and described stepper motor output terminal is connected with described ball-screw;
The moment of torsion mounting portion being connected with nut support seat with the guide rail slide block of described loading attachment, described moment of torsion mounting portion comprises worktable and major axis, described major axis one end is connected to install even twisting moment sensor with positive coupling by flat key, worktable bottom is connected with guide rail slide block and feed screw nut supporting base by bolt, by leading screw, rotate and realize worktable at axial feed motion, facilitate installation and the dismounting of torque sensor;
With the levelling device that the major axis other end of described moment of torsion mounting portion is connected, described levelling device is arm of force crossbeam;
Be fixed on the automatic loading device at described levelling device two ends, described automatic loading device adopts stepper motor B band movable eccentric wheel to carry out gyration, and eccentric wheel drives support tray to carry out straight line lifting, thereby realizes the automatic loading and unloading of counterweight;
Described automatic loading device comprises upper plate, the automatic loading unit of eccentric wheel, center suspension rod, antiswing device, framework pillar and lower shoe, described framework pillar upper end is provided with upper plate, lower end is provided with lower shoe, described antiswing device is fixed on described lower shoe, described lower shoe fixes on the ground by foot bolt, described center suspension rod is vertically by described upper plate symcenter and be fixed in the antiswing device on described lower shoe, and described center suspension rod is evenly provided with the automatic loading unit of eccentric wheel from top to bottom.
The automatic loading unit of described eccentric wheel comprises at least two group counterweight electric driving mechanisms, support tray, stressed thimble, linear bearing and line slideway, described stressed thimble is arranged on the suspension rod of described center, support tray bottom contacts with linear bearing, counterweight is placed on top, described counterweight electric driving mechanism drives support tray along line slideway, to move up and down under the effect of described linear bearing, realizes loading and the unloading of counterweight on stressed thimble.
Described counterweight electric driving mechanism comprises stepper motor B, motor cabinet, bearing seat, angular contact ball bearing and eccentric wheel, stepper motor B is fixed on motor cabinet, motor cabinet is fixedly mounted on framework pillar side surface by trip bolt, eccentric wheel one end and motor cabinet are connected, one end is fixed by bearing, and the eccentric wheel of described at least two group counterweight electric driving mechanisms contacts with described support tray by rolling bearing.
The number of the automatic loading unit of eccentric wheel that described center suspension rod evenly arranges is from top to bottom 13, counterweight in the automatic loading unit of described eccentric wheel is followed successively by a 20g counterweight from top to bottom or from bottom to top, two 40g counterweights, a 100g counterweight, a 200g counterweight, two 400g counterweights, a 1kg counterweight, five 2kg counterweights.
Described counterweight is stepped circular counterweight, and bellmouth is arranged at counterweight bottom, and during loading, described bellmouth contacts with the stressed thimble of described center suspension rod.
The beneficial effects of the utility model are: the utility model mechanism frame adopts the both sides centered by worktable to load the symmetrical structure of counterweight mechanism, and every group loads in counterweight mechanism, suspension rod is vertically fixed in the antiswing device on sill by entablature symcenter, then centered by suspension rod the symmetrical structure of both sides installation frame side plate.This integrated symmetric structure has further improved the rigidity of this measurement torque machine simultaneously in the stability that has increased system, effectively overcome by power value and loaded unstable and cause the inaccurate shortcoming of torque measurement.
Counterweight of the present utility model adopts stepped circular counterweight, and counterweight bottom has bellmouth, this design effectively to strengthen the accuracy of feeling relieved when counterweight masterpiece is used in suspension rod, makes this device further improve the stability that power value loads, and the precision of torque measurement.
The utility model independently adds and unloads counterweight dead weight type safe torque-measuring apparatus, by adopting stepper motor band movable eccentric wheel to carry out gyration, the rolling bearing that eccentric wheel short sleeve has contacts with pallet, thereby drive pallet to carry out straight line lifting, and then realize the automatic loading and unloading of any amount counterweight, thereby realize the measurement of different moments of torsion; Motor-driven structure is simple, and the loading velocity that fundamentally solved torque-measuring apparatus is in the past slow, it is complicated to load, control device is complicated, and operation is difficult for, and is difficult to realize the problem of robotization.
Accompanying drawing explanation
Fig. 1 unloads counterweight dead weight type safe torque-measuring apparatus one-piece construction schematic diagram of the present utility model independently adding;
Fig. 2 unloads independent loads counterweight mechanism structure schematic diagram in counterweight dead weight type safe torque-measuring apparatus of the present utility model independently adding;
Fig. 3 unloads in counterweight dead weight type safe torque-measuring apparatus independent loads counterweight mechanism structure A to perspective view of the present utility model independently adding;
Fig. 4 is the principle of work schematic diagram that unloads independent Jia Xie counterweight mechanism in counterweight dead weight type safe torque-measuring apparatus that independently adds of the present utility model;
Fig. 5 unloads counterweight structural representation in counterweight dead weight type safe torque-measuring apparatus of the present utility model independently adding;
Fig. 6 unloads counterweight structure cut-away illustration in counterweight dead weight type safe torque-measuring apparatus of the present utility model independently adding;
Wherein: 1, bracing or strutting arrangement, 2, loading attachment, 201, stepper motor A, 202, ball-screw, 203, slide rail, 204, guide rail slide block, 3, moment of torsion mounting portion, 301, worktable, 302, major axis, 4, levelling device, 5, automatic loading device, 501, upper plate, 502, eccentric wheel, 503, angular contact ball bearing, 504, bearing seat, 505, trip bolt, 506, stepper motor B, 507, 2kg counterweight, 508, stressed thimble, 509, 1kg counterweight, 510, 400g counterweight, 511, 200g counterweight, 512, 100g counterweight, 513, 40g counterweight, 514, 20g counterweight, 515, center suspension rod, 516, antiswing device, 517, linear bearing, 518, line slideway, 519, support tray, 520, lower shoe, 521, framework pillar, 522, motor cabinet.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
Referring to accompanying drawing 1, of the present utility model independently adding, unloads counterweight dead weight type safe torque-measuring apparatus and comprises:
Bracing or strutting arrangement 1, described bracing or strutting arrangement 1 is square frame;
Be fixed on the loading attachment 2 of described bracing or strutting arrangement 1 upper surface, described loading attachment 2 comprises stepper motor A201, ball-screw 202, feed screw nut, nut support seat, slide rail 203 and guide rail slide block 204, described slide rail 203 is fixed on the upper surface of described bracing or strutting arrangement 1, slide rail 203 and guide rail slide block 204 form moving sets, described ball-screw 202 and feed screw nut form screw pair, described feed screw nut is connected with described slide block by nut support seat, and described stepper motor output terminal is connected with described ball-screw 202;
The moment of torsion mounting portion 3 being connected with nut support seat with the guide rail slide block 204 of described loading attachment 2, described moment of torsion mounting portion 3 comprises worktable 301 and major axis 302, described major axis 302 one end are connected to install even twisting moment sensor with positive coupling by flat key, worktable 301 bottoms are connected with guide rail slide block 204 and feed screw nut supporting base by bolt, by leading screw, rotate and realize worktable 301 at axial feed motion, facilitate installation and the dismounting of torque sensor;
With the levelling device 4 that major axis 302 other ends of described moment of torsion mounting portion 3 are connected, described levelling device 4 is arm of force crossbeam;
Be fixed on the automatic loading device 5 at described levelling device 4 two ends, described automatic loading device 5 adopts stepper motor B506 band movable eccentric wheel 502 to carry out gyration, eccentric wheel 502 drives support tray 519 to carry out straight line lifting, thereby realizes the automatic loading and unloading of counterweight.
Referring to accompanying drawing 2, accompanying drawing 3 and accompanying drawing 4, described automatic loading device 5 comprises upper plate 501, the automatic loading unit of eccentric wheel, center suspension rod 515, antiswing device 516, framework pillar 521 and lower shoe 520, described framework pillar 521 upper ends are provided with upper plate 501, lower end is provided with lower shoe 520, described antiswing device 516 is fixed on described lower shoe 520, described lower shoe 520 fixes on the ground by foot bolt, described center suspension rod 515 is vertical by described upper plate 501 symcenter and be fixed in the antiswing device 516 on described lower shoe 520, described center suspension rod 515 is evenly provided with the automatic loading unit of eccentric wheel from top to bottom.
The automatic loading unit of described eccentric wheel comprises at least two group counterweight electric driving mechanisms, support tray 519, stressed thimble 508, linear bearing 517 and line slideway 518, described stressed thimble 508 is arranged on described center suspension rod 515, support tray 519 bottoms contact with linear bearing 517, counterweight is placed on top, described counterweight electric driving mechanism drives support tray 519 along line slideway 518, to move up and down under the effect of described linear bearing 517, realizes loading and the unloading of counterweight on stressed thimble 508.
Described counterweight electric driving mechanism comprises stepper motor B506, motor cabinet 522, bearing seat 504, angular contact ball bearing 503 and eccentric wheel 502, described stepper motor B506 is fixed on motor cabinet 522, motor cabinet 522 is fixedly mounted on framework pillar 521 side surfaces by trip bolt 505, eccentric wheel 502 one end and motor cabinet 522 are connected, one end is fixed by bearing, and the eccentric wheel 502 of described at least two group counterweight electric driving mechanisms contacts with described support tray 519 by rolling bearing.
The number of the automatic loading unit of eccentric wheel that described center suspension rod 515 evenly arranges is from top to bottom 13, counterweight in the automatic loading unit of described eccentric wheel is followed successively by a 20g counterweight 514 from top to bottom or from bottom to top, two 40g counterweights 513, a 100g counterweight 512, a 200g counterweight 511,509, five 2kg counterweights 507 of 510, one 1kg counterweights of two 400g counterweights.
Referring to accompanying drawing 5 and accompanying drawing 6, described counterweight is stepped circular counterweight, and bellmouth is arranged at counterweight bottom, when counterweight drops on the stressed thimble 508 of center suspension rod 515, can accurately feel relieved.
A dead weight type safe standard torquer that model is 55Nm, the moment of torsion producing with special counterweight is added in the calibrating installation on tested torque sensor.Mainly by bracing or strutting arrangement 1, loading attachment 2, eccentric wheel type automatic loading device 5, levelling device 4, moment of torsion mounting portion 3 and composition of the control system thereof.The automatic independent loads counterweight of described eccentric wheel type mechanism is comprised of two of left and right part, be placed in respectively the two ends of levelling device 4 arm of force crossbeams, each side load maintainer does gyration by stepper motor rotating band movable eccentric wheel 502, support tray 519 does up and down reciprocatingly rectilinear motion along line slideway 518 under the effect of eccentric wheel 502 and linear bearing 517, and then realizes the loading procedure of required counterweight.By different proof force values and then generation moment of torsion, realize the static verification to torque sensor.This device Driving Stepping Motor B506 is fixed on motor cabinet 522, motor cabinet 522 is fixedly mounted on framework pillar 521 side surfaces, eccentric wheel 502 one end and motor cabinet 522 are connected, one end is fixed by angular contact ball bearing 503, support tray 519 contacts with eccentric wheel 502, support tray 519 bottoms contact with linear bearing 517, upper support counterweight.When support tray 519 moves down, counterweight leaves mutually with support tray 519, thereby Weight gravity is acted on the stressed thimble 508 on center suspension rod 515.For holding device level, automatic loading device 5 ground connect to guarantee steadily with foot bolt.
While loading counterweight, operator is inputted and is loaded numerical value by matrix keyboard, matrix keyboard sends numerical value to single-chip microcomputer, the corresponding eccentric wheel 502 of Single-chip Controlling loads counterweight stepper motor B506 and drives required relay switch, thereby make stepper motor running, the logical eccentric wheel 502 of band does gyration, and support tray 519 does up and down reciprocatingly rectilinear motion under the effect of eccentric wheel 502 and linear bearing 517, and then realizes the loading procedure of required counterweight.Counterweight rectilinear motion distance is rotated fixed angle control by stepper motor B506, and reference position is peak, and when counterweight need to load, stepper motor stops after rotating 180 degree, and now counterweight is loaded on the stressed thimble 508 of center suspension rod 515 and forms power value.When loading end unloading, stepper motor B506 is rotated further 180 degree to be stopped, and now counterweight is got back to reference position, off center suspension rod 515 and stressed thimble 508.
The torque precision that this device will produce is 0.1NM, and measurement range is 0.1-55NM, known by analyzing, and charger is divided into 13 grades, makes it to realize between 0.1-55NM, to produce any numerical value moment of torsion that precision is 0.1NM.Therefore be 20g because the moment of torsion that this device arm of force length is 500mm will produce 0.1NM needs counterweight weight, it is 40g that the moment of torsion of generation 0.2NM needs counterweight weight, it is 100g that the moment of torsion of generation 0.5NM needs counterweight weight, the moment of torsion that produces 1NM needs counterweight 200g, the moment of torsion that produces 2NM needs counterweight 400g, the moment of torsion that produces 5NM needs counterweight 1kg, the moment of torsion that produces 10NM needs counterweight 2kg, therefore final allocative decision is as follows: a 20g counterweight 514, two 40g counterweights 513, a 100g counterweight 512, a 200g counterweight 511, two 400g counterweights 510, a 1kg counterweight 509, five 2kg counterweights 507, totally 13 groups of counterweights,
Counterweight material adopts E2 non-magnetic stainless steel, and density is 7.9, therefore there is as calculated each counterweight size as follows:
| Weight | H（mm） | H（mm） | f 1（mm） | f 2（mm） |
| 20g | 5 | 3 | 10 | 8 |
| 40g | 5 | 3 | 15 | 12 |
| 100g | 8 | 5 | 18 | 15 |
| 200g | 8 | 5 | 22 | 19 |
| 400g | 8 | 5 | 32 | 29 |
| 1kg | 8 | 5 | 50 | 47 |
Be more than embodiment of the present utility model, but absolutely not to restriction of the present utility model.
Claims (5)
1. independently add and unload counterweight dead weight type safe torque-measuring apparatus, comprise bracing or strutting arrangement (1), loading attachment (2), moment of torsion mounting portion (3) and levelling device (4), it is characterized in that, described torque-measuring apparatus also comprises automatic loading device (5);
Described bracing or strutting arrangement (1) is square frame;
Described loading attachment (2) is fixed on described bracing or strutting arrangement (1) upper surface, described loading attachment (2) comprises stepper motor A(201), ball-screw (202), feed screw nut, nut support seat, slide rail (203) and guide rail slide block (204), described slide rail (203) is fixed on the upper surface of described bracing or strutting arrangement (1), slide rail (203) and guide rail slide block (204) form moving sets, described ball-screw (202) and feed screw nut form screw pair, described feed screw nut is connected with described slide block by nut support seat, described stepper motor output terminal is connected with described ball-screw (202),
Described moment of torsion mounting portion (3) is connected with nut support seat with the guide rail slide block (204) of described loading attachment (2), described moment of torsion mounting portion (3) comprises worktable (301) and major axis (302), described major axis (302) one end is connected to install even twisting moment sensor with positive coupling by flat key, worktable (301) bottom is connected with guide rail slide block (204) and feed screw nut supporting base by bolt, by leading screw, rotate and realize worktable (301) at axial feed motion, facilitate installation and the dismounting of torque sensor;
Described levelling device (4) is connected with major axis (302) other end of described moment of torsion mounting portion (3), and described levelling device (4) is arm of force crossbeam;
Described automatic loading device (5) is fixed on described levelling device (4) two ends, described automatic loading device (5) adopts stepper motor B(506) be with movable eccentric wheel (502) to carry out gyration, eccentric wheel (502) drives support tray (519) to carry out straight line lifting, thereby realizes automatic loading and the unloading of counterweight;
Described automatic loading device (5) comprises upper plate (501), the automatic loading unit of eccentric wheel, center suspension rod (515), antiswing device (516), framework pillar (521) and lower shoe (520), described framework pillar (521) upper end is provided with upper plate (501), lower end is provided with lower shoe (520), described antiswing device (516) is fixed on described lower shoe (520), described lower shoe (520) fixes on the ground by foot bolt, described center suspension rod (515) is vertically by described upper plate (501) symcenter and be fixed in described antiswing device (516), described center suspension rod (515) is evenly provided with the automatic loading unit of eccentric wheel from top to bottom.
2. according to claim 1 independently adding, is unloaded counterweight dead weight type safe torque-measuring apparatus, it is characterized in that, the automatic loading unit of described eccentric wheel comprises at least two group counterweight electric driving mechanisms, support tray (519), stressed thimble (508), linear bearing (517) and line slideway (518), described stressed thimble (508) is arranged on described center suspension rod (515), support tray (519) bottom contacts with linear bearing (517), counterweight is placed on top, described counterweight electric driving mechanism drives support tray (519) along line slideway (518), to move up and down under the effect of described linear bearing (517), realize loading and the unloading of counterweight on stressed thimble (508).
3. according to claim 2 independently adding, is unloaded counterweight dead weight type safe torque-measuring apparatus, it is characterized in that, described counterweight electric driving mechanism comprises stepper motor B(506), motor cabinet (522), bearing seat (504), angular contact ball bearing (503) and eccentric wheel (502), stepper motor B(506) be fixed on motor cabinet (522), motor cabinet (522) is fixedly mounted on framework pillar (521) side surface by trip bolt (505), eccentric wheel (502) one end and motor cabinet (522) are connected, one end is fixed by bearing, the eccentric wheel (502) of described at least two group counterweight electric driving mechanisms contacts with described support tray (519) by rolling bearing.
4. according to claim 2 independently adding, is unloaded counterweight dead weight type safe torque-measuring apparatus, it is characterized in that, described counterweight is stepped circular counterweight, and bellmouth is arranged at counterweight bottom, during loading, described bellmouth contacts with the stressed thimble (508) of described center suspension rod (515).
5. according to claim 1 independently adding, is unloaded counterweight dead weight type safe torque-measuring apparatus, it is characterized in that, the number of the automatic loading unit of eccentric wheel that described center suspension rod (515) evenly arranges is from top to bottom 13, counterweight in the automatic loading unit of described eccentric wheel is followed successively by a 20g counterweight (514) from top to bottom or from bottom to top, two 40g counterweights (513), a 100g counterweight (512), a 200g counterweight (511), two 400g counterweights (510), a 1kg counterweight (509), five 2kg counterweights (507).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320703739.XU CN203551194U (en) | 2013-11-08 | 2013-11-08 | Dead weight-type torque-measuring apparatus capable of independently loading and unloading counterweight |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320703739.XU CN203551194U (en) | 2013-11-08 | 2013-11-08 | Dead weight-type torque-measuring apparatus capable of independently loading and unloading counterweight |
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| CN203551194U true CN203551194U (en) | 2014-04-16 |
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|---|---|---|---|
| CN201320703739.XU Withdrawn - After Issue CN203551194U (en) | 2013-11-08 | 2013-11-08 | Dead weight-type torque-measuring apparatus capable of independently loading and unloading counterweight |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575463A (en) * | 2013-11-08 | 2014-02-12 | 吉林大学 | Independent weight loading-unloading dead-load type torque measurement device |
| CN105547691A (en) * | 2015-12-03 | 2016-05-04 | 中国南方航空工业(集团)有限公司 | Power shaft assembly torque calibration device and torque matching control method |
-
2013
- 2013-11-08 CN CN201320703739.XU patent/CN203551194U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575463A (en) * | 2013-11-08 | 2014-02-12 | 吉林大学 | Independent weight loading-unloading dead-load type torque measurement device |
| CN103575463B (en) * | 2013-11-08 | 2015-06-10 | 吉林大学 | Independent weight loading-unloading dead-load type torque measurement device |
| CN105547691A (en) * | 2015-12-03 | 2016-05-04 | 中国南方航空工业(集团)有限公司 | Power shaft assembly torque calibration device and torque matching control method |
| CN105547691B (en) * | 2015-12-03 | 2018-08-07 | 中国南方航空工业(集团)有限公司 | Power shaft assembly torque calibrating device and torque match control method |
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Granted publication date: 20140416 Effective date of abandoning: 20150610 |
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