CN107578676A - A kind of inclined-plane acceleration test device - Google Patents
A kind of inclined-plane acceleration test device Download PDFInfo
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- CN107578676A CN107578676A CN201710842936.2A CN201710842936A CN107578676A CN 107578676 A CN107578676 A CN 107578676A CN 201710842936 A CN201710842936 A CN 201710842936A CN 107578676 A CN107578676 A CN 107578676A
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- slide plate
- electromagnet
- dolly
- tilting slide
- test device
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Abstract
The invention discloses a kind of inclined-plane acceleration test device, including tilting slide plate, horizontal slide plate, dotted timer, paper tape and dolly；The lower end of tilting slide plate and horizontal slide plate drop-over, dotted timer are arranged on the top of tilting slide plate, and paper tape is connected through dotted timer and with the rear end of dolly；Dolly includes car body and arrestment mechanism；The rear portion of car body is provided with hind axle, and the first adsorption piece is arranged with the middle part of hind axle；Arrestment mechanism includes power supply, the first electromagnet, mercoid switch, extension spring and spring base；Power supply, the first electromagnet and mercoid switch pass sequentially through wired in series, first electromagnet is arranged on the front side of the first adsorption piece, the rear portion of first electromagnet is provided with arc groove, and spring base is fixed on the front side of the first electromagnet, and the both ends of extension spring are connected with spring base and the first electromagnet respectively.Automatically by skidding during moving of car to the plane slide plate of the present invention, braking is reliable and safe, efficiently avoid dolly and is damaged because of collision.
Description
Technical field
The present invention relates to physical teaching aid technical field, more particularly to a kind of experimental provision of inclined-plane acceleration.
Background technology
The acceleration that the purpose checking dolly of inclined-plane acceleration test moves on inclined-plane, when dolly is placed on inclined-plane,
Under gravity, the dolly on inclined-plane scrolls down through along inclined-plane, and acceleration of gravity is straight down, parallel to inclined-plane
Gravitational acceleration component is gsin θ, this be ignore friction after dolly net acceleration, in order to measure this acceleration, make dolly
From static startup, according to the rule of uniformly accelerated motion, the displacement difference in adjacent equal time interval is equal, △ S=
aT2, the actual acceleration caused by gravity accelerates g can be calculated.
At present, when doing inclined-plane acceleration test, for dolly in slide downward on inclined-plane, dolly can obtain a speed,
In order to allow dolly to stop, one baffle plate typically is set in the lower end on inclined-plane, by the barrier effect of baffle plate so that dolly stops,
In the process, dolly can produce a collision with baffle plate, and the situation that dolly is damaged often occurs in experiment, adds reality
Test the cost of equipment.
The content of the invention
For in the prior art the defects of, the invention provides a kind of experimental provision of inclined-plane acceleration, so that dolly is transported
Move to, automatically by skidding, braking is reliable and safe, effectively dolly can be avoided to be damaged because of collision during plane slide plate.
The invention provides a kind of inclined-plane acceleration test device, including tilting slide plate, horizontal slide plate, dotted timer,
Paper tape and dolly；The lower end of the tilting slide plate and horizontal slide plate drop-over, the dotted timer are arranged on tilting slide plate top
Upper side, the paper tape with the rear end of dolly through dotted timer and being connected；The dolly includes car body and arrestment mechanism；
The front portion of the car body is provided with front axle, and the both ends of the front axle are mounted on front wheel, after the rear portion of car body is provided with
Wheel shaft, the both ends of the hind axle are mounted on rear roller, and being arranged with the middle part of hind axle can be with the first absorption of magnet adsorption
Part；The arrestment mechanism includes power supply, the first electromagnet, mercoid switch, extension spring and the spring base being arranged in car body；The electricity
Source, the first electromagnet and mercoid switch pass sequentially through wire head and the tail series connection to form loop, and the mercoid switch is in tilting of car body
When disconnect so that the loop disconnects, mercoid switch closed so that the circuit closed in car body level；First electromagnet is set
Put in the front side of the first adsorption piece, the rear portion of the first electromagnet is provided with the arc groove to match with first adsorption piece, institute
State on the car body that spring base is fixed on front side of the first electromagnet, the both ends of the extension spring connect with spring base and the first electromagnet respectively
Connect.
For the dolly of the present invention when on inclined-plane slide plate slidably, dotted timer lays one every 0.02s on paper slip
Individual point, you can the displacement difference in mutually equal time interval is measured by the paper slip got ready, so as to calculate because gravity adds
Acceleration caused by fast g.Because the relation of gravity, the mercury globule of mercoid switch lower ground square into container can flow away, this
When the dolly of invention is located on tilting slide plate, the mercury globule of mercoid switch is at the position for disconnecting it, the first electromagnet
In off-position, extension spring is pulled along the first electromagnet so that the first electromagnet is separated with the first adsorption piece, and arrestment mechanism is in
Off position, dolly can slidably, when moving of car to horizontal slide plate, the angulation change of dolly so that mercury is opened
The mercury globule of pass flows to the position for closing it, and the first electromagnet is powered and produces absorption affinity, the first electromagnet and first
Attraction between adsorption piece is more than the pulling force of extension spring so that the first electromagnet moves to the first adsorption piece, the first electromagnet
Arc groove contacts with the first adsorption piece, so, you can is carried out certainly by the frictional force between arc groove and the first adsorption piece
It is dynamic so that dolly slows down and stopped, reliable by dolly and the braking method of stop collision, braking of the invention compared to traditional
And safety, it efficiently avoid dolly and damaged because of collision.
Further, guide rail is installed, first electromagnet can be front and rear sliding on the car body of the first electromagnet both sides
It is arranged on dynamicly between two guide rails.Guide rail can limit the first electromagnet left and right sidesing shifting, and the first electromagnet can only be between the guide rails
Slide back and forth.
Further, covered with one layer of rubber slab in the arc groove of first electromagnet, during absorption, the first electromagnet
Contacted by the rubber slab with the first adsorption piece.Rubber slab can increase the frictional force to the first adsorption piece, lifting braking effect
Fruit.
Further, first adsorption piece is steel shaft set.
Further, in addition to bottom plate, the horizontal slide plate are arranged on bottom plate, and the lower end of the tilting slide plate passes through pin
Axle is connected with horizontal slide plate, so that tilting slide plate can rotate around bearing pin, is provided with below the tilting slide plate and is supported on this and inclines
Pneumatic linear actuator between taper slide and bottom plate, upper end and the tilting slide plate of the pneumatic linear actuator are hinged, and lower end and the bottom plate of pneumatic linear actuator are cut with scissors
Connect.Using said structure, you can flexible by pneumatic linear actuator controls the angle of inclination of tilting slide plate, so as to passing through difference
The tilting slide plate of the gradient verifies acceleration so that the data of experiment are more rich.
Further, the side of the bearing pin is provided with protractor, and the center of circle of the protractor is located at the upper table of the bottom plate
On the intersecting lens of face and the lower surface of tilting slide plate.Pass through protractor, you can measure the angle of inclination of tilting slide plate, user
Just.
Further, elasticity transition plate is installed on the upside of the junction of the tilting slide plate and horizontal slide plate, the elasticity
The rear side of rebound is in smoothing junction with tilting slide plate, and the front side of elasticity transition plate and horizontal slide plate are in smoothing junction.Elasticity transition plate
It is flexible, adjust the angle between tilting slide plate and horizontal slide plate anyway, elasticity transition plate can make tilting slide plate with
Horizontal slide plate smooth-going connection, so as to ensure that dolly smoothly slides into horizontal slide plate from tilting slide plate.
Further, the front end of the dotted timer is provided with the second electromagnet, and the rear end of the dolly is provided with can
With the second adsorption piece of magnet adsorption, second electromagnet mutually attracts with the second adsorption piece.Second electromagnet is powered, by beating
Dolly is temporarily fixed to the correspondence position of tilting slide plate, the power-off of the second electromagnet by the second electromagnet suction effect of point timer
Afterwards, the second adsorption piece loses the suction of the second electromagnet, and dolly slides along tilting slide plate, is easy to control the initial velocity of dolly
Degree.
Further, the dotted timer is spark timer.
Beneficial effects of the present invention are embodied in：Automatically by skidding during moving of car to the plane slide plate of the present invention,
Braking is reliable and safe, effectively prevent dolly and is damaged because of collision.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment.In all of the figs, similar device or part are typically by class
As reference identify.In accompanying drawing, each device or part might not be drawn according to the ratio of reality.
Fig. 1 is the structural representation of the present embodiment；
Fig. 2 is the internal structure schematic diagram of the dolly of the present embodiment；
Fig. 3 is the structural representation of the arrestment mechanism of the present embodiment.
In accompanying drawing, 1 represents tilting slide plate；2 represent horizontal slide plate；3 represent dotted timer；4 represent paper tape；5 represent small
Car；51 represent car body；52 represent front axle；53 represent front wheel；54 represent hind axle；55 represent rear roller；56 represent first
Adsorption piece；57 represent power supply；58 represent the first electromagnet；581 represent arc groove；582 represent rubber slab；59 expression mercurys are opened
Close；510 represent extension spring；511 represent spring base；512 represent wire；513 represent guide rail；6 represent bottom plate；7 represent bearing pin；8 tables
Show pneumatic linear actuator；9 represent protractor；10 represent elasticity transition plate；11 represent the second electromagnet；12 represent the second adsorption piece.
Embodiment
The embodiment of technical solution of the present invention is described in detail below in conjunction with accompanying drawing.Following examples are only used for
Clearly illustrate technical scheme, therefore be only used as example, and the protection model of this patent can not be limited with this
Enclose.
As shown in Figure 1-Figure 3, the embodiments of the invention provide a kind of inclined-plane acceleration test device, including tilting slide plate 1,
Horizontal slide plate 2, dotted timer 3, paper tape 4, dolly 5 and bottom plate 6, tilting slide plate 1 and horizontal slide plate 2 are installed on bottom plate 6,
The lower end of tilting slide plate 1 and the drop-over of horizontal slide plate 2, the dotted timer 3 of the present embodiment is spark timer, is got ready
Timer 3 is arranged on the upper side on the top of tilting slide plate 1, and paper tape 4 is connected through dotted timer 3 and with the rear end of dolly 5, small
For car 5 when on inclined-plane slide plate slidably, dotted timer 3 beats next point every 0.02s on paper slip, you can by getting ready
Paper slip measure displacement difference in mutually equal time interval, so as to calculate the acceleration caused by gravity accelerates g.
Reference picture 2 and Fig. 3, dolly 5 include car body 51 and arrestment mechanism, and the front portion of car body 51 is provided with front axle 52, preceding
The both ends of wheel shaft 52 are mounted on front wheel 53, and the rear portion of car body 51 is provided with hind axle 54, and the both ends of hind axle 54 are respectively mounted
There is rear roller 55, the middle part of hind axle 54 is arranged with can be with the first adsorption piece 56 of magnet adsorption, first absorption of the present embodiment
Part 56 is preferably steel shaft set；Arrestment mechanism include be arranged on car body 51 in power supply 57, the first electromagnet 58, mercoid switch 59,
Extension spring 510 and spring base 511；Power supply 57, the first electromagnet 58 and mercoid switch 59 pass sequentially through wire 512 and connected from beginning to end with shape
Into loop, mercoid switch 59 disconnects when car body 51 tilts so that the loop disconnects, and mercoid switch 59 closes when car body 51 is horizontal
Close so that the circuit closed；First electromagnet 58 is arranged on the front side of the first adsorption piece 56, the car body of the both sides of the first electromagnet 58
Guide rail 513 is installed, the first electromagnet 58 can be arranged between two guide rails 513 slidingly back and forth, and such guide rail 513 can be with 51
The left and right sidesing shifting of the first electromagnet 58 is limited, the first electromagnet 58 can only slide back and forth between guide rail 513, the first electromagnet 58
Rear portion is provided with the arc groove 581 to match with the first adsorption piece 56, and spring base 511 is fixed on the front side of the first electromagnet 58
On car body 51, the both ends of extension spring 510 are connected with the electromagnet 58 of spring base 511 and first respectively.
Because the relation of gravity, the mercury globule of mercoid switch 59 lower ground square into container can flow away, the present embodiment
Dolly 5 when being located on tilting slide plate 1, the mercury globule of mercoid switch 59 is in the position for disconnecting it, the first electromagnet 58
In off-position, extension spring 510 is pulled along the first electromagnet 58 so that the first electromagnet separates with the first adsorption piece 56, system
Motivation structure is in off position, and dolly 5 can slidably, and when dolly 5 moves to horizontal slide plate 2, the angle of dolly 5 changes
Becoming so that the mercury globule of mercoid switch 59 flows to the position for closing it, and the first electromagnet is powered and produces absorption affinity, the
Attraction between one electromagnet and the first adsorption piece 56 is more than the pulling force of extension spring 510 so that the first electromagnet adsorbs to first
Part 56 moves, and the arc groove 581 of the first electromagnet contacts with the first adsorption piece 56, so, you can by arc groove 581 with
Frictional force between first adsorption piece 56 carries out automatic so that dolly 5 slows down and stopped.
The present embodiment can in the arc groove 581 of the first electromagnet 58 one layer of rubber slab 582 of covering, during absorption, first
Electromagnet 58 is contacted by rubber slab 582 with the first adsorption piece 56, and rubber slab 582 can increase the friction to the first adsorption piece 56
Power, lift braking effect.
The present embodiment is braked by the arrestment mechanism inside dolly 5, compared to traditional system by dolly 5 and stop collision
Dynamic method, the braking of the present embodiment is reliable and safe, efficiently avoid dolly 5 and is damaged because of collision.
The lower end of tilting slide plate 1 is connected by bearing pin 7 with horizontal slide plate 2, so that tilting slide plate 1 can rotate around bearing pin 7, is inclined
The lower section of taper slide 1 is provided with the pneumatic linear actuator 8 being supported between the tilting slide plate 1 and bottom plate 6, the upper end of pneumatic linear actuator 8 and inclination
Slide plate 1 is be hinged, the lower end of pneumatic linear actuator 8 and bottom plate 6 are be hinged, so, you can flexible by pneumatic linear actuator 8 controls tilting slide plate 1
Angle of inclination, so as to verify acceleration by the tilting slide plate 1 of different gradient so that the data of experiment are more rich.
The side of bearing pin 7 is provided with protractor 9, and the center of circle of the protractor 9 is located at the upper surface of bottom plate 6 and the lower surface of tilting slide plate 1
Intersecting lens on, pass through protractor 9, you can measure the angle of inclination of tilting slide plate 1, it is easy to use.
Elasticity transition plate 10 is installed on the upside of the junction of tilting slide plate 1 and horizontal slide plate 2, the elasticity transition plate 10
Rear side is in smoothing junction with tilting slide plate 1, and the front side of elasticity transition plate 10 is in smoothing junction with horizontal slide plate 2, and elasticity transition plate 10 has
It is flexible, the angle between tilting slide plate 1 and horizontal slide plate 2 is adjusted anyway, and elasticity transition plate 10 can make tilting slide plate 1
Smooth out and connect with horizontal slide plate 2, so as to ensure that dolly 5 smoothly slides into horizontal slide plate 2 from tilting slide plate 1.
The front end of dotted timer 3 is provided with the second electromagnet 11, and the rear end of dolly 5 is provided with can be with the of magnet adsorption
Two adsorption pieces 12, the second electromagnet 11 attract with the phase of the second adsorption piece 12, and the second electromagnet 11 is powered, and passes through dotted timer 3
The suction of the second electromagnet 11 dolly 5 is temporarily fixed to the correspondence position of tilting slide plate 1, the second electromagnet 11 powers off
Afterwards, the second adsorption piece 12 loses the suction of the second electromagnet 11, and dolly 5 slides along tilting slide plate 1, is easy to control dolly 5
Initial velocity.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to foregoing embodiments, it will be understood by those within the art that：It is still
Technical scheme described in foregoing embodiments can be modified, either which part or all technical characteristic are carried out
Equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technical side
The scope of case, it all should cover among the claim of the present invention and the scope of specification.
Claims (9)
- A kind of 1. inclined-plane acceleration test device, it is characterised in that：Including tilting slide plate, horizontal slide plate, dotted timer, paper tape and dolly；The lower end of the tilting slide plate and horizontal slide plate drop-over, the dotted timer are arranged on the upside on tilting slide plate top Face, the paper tape are connected through dotted timer and with the rear end of dolly；The dolly includes car body and arrestment mechanism；The front portion of the car body is provided with front axle, and the both ends of the front axle are mounted on front wheel, the rear portion installation of car body There is hind axle, the both ends of the hind axle are mounted on rear roller, and being arranged with the middle part of hind axle can be with the first of magnet adsorption Adsorption piece；The arrestment mechanism includes power supply, the first electromagnet, mercoid switch, extension spring and the spring base being arranged in car body；It is described Power supply, the first electromagnet and mercoid switch pass sequentially through wire head and the tail series connection to form loop, and the mercoid switch inclines in car body Disconnected when tiltedly so that the loop disconnects, mercoid switch is closed so that the circuit closed in car body level；First electromagnet The front side of the first adsorption piece is arranged on, the rear portion of the first electromagnet is provided with the arc groove to match with first adsorption piece, The spring base is fixed on the car body on front side of the first electromagnet, the both ends of the extension spring respectively with spring base and the first electromagnet Connection.
- 2. acceleration test device in inclined-plane according to claim 1, it is characterised in that：The car of the first electromagnet both sides Guide rail is installed, first electromagnet can be arranged between two guide rails slidingly back and forth on body.
- 3. acceleration test device in inclined-plane according to claim 1 or 2, it is characterised in that：The arc of first electromagnet Covered with one layer of rubber slab in connected in star, during absorption, the first electromagnet is contacted by the rubber slab with the first adsorption piece.
- 4. acceleration test device in inclined-plane according to claim 3, it is characterised in that：First adsorption piece is steel shaft Set.
- 5. acceleration test device in inclined-plane according to claim 1, it is characterised in that：Also include bottom plate, it is described horizontal sliding Plate is arranged on bottom plate, and the lower end of the tilting slide plate is connected by bearing pin with horizontal slide plate, so that tilting slide plate can be around bearing pin Rotate, the pneumatic linear actuator being supported between the tilting slide plate and bottom plate is provided with below the tilting slide plate, the pneumatic linear actuator Upper end is hinged with tilting slide plate, and lower end and the bottom plate of pneumatic linear actuator are hinged.
- 6. acceleration test device in inclined-plane according to claim 5, it is characterised in that：The side amount of being provided with of the bearing pin Angle device, the center of circle of the protractor are located on the intersecting lens of the upper surface of the bottom plate and the lower surface of tilting slide plate.
- 7. acceleration test device in inclined-plane according to claim 5, it is characterised in that：The tilting slide plate and horizontal slide plate Junction on the upside of elasticity transition plate is installed, the rear side of the elasticity transition plate is in smoothing junction with tilting slide plate, elasticity transition The front side of plate is in smoothing junction with horizontal slide plate.
- 8. acceleration test device in inclined-plane according to claim 1, it is characterised in that：The front end of the dotted timer is set Be equipped with the second electromagnet, the rear end of the dolly be provided with can with the second adsorption piece of magnet adsorption, second electromagnet with Second adsorption piece mutually attracts.
- 9. acceleration test device in inclined-plane according to claim 8, it is characterised in that：The dotted timer is electric spark Timer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710842936.2A CN107578676B (en) | 2017-09-18 | 2017-09-18 | A kind of inclined-plane acceleration test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710842936.2A CN107578676B (en) | 2017-09-18 | 2017-09-18 | A kind of inclined-plane acceleration test device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107578676A true CN107578676A (en) | 2018-01-12 |
| CN107578676B CN107578676B (en) | 2019-08-20 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710842936.2A Active CN107578676B (en) | 2017-09-18 | 2017-09-18 | A kind of inclined-plane acceleration test device |
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| Country | Link |
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| CN (1) | CN107578676B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107958621A (en) * | 2018-01-25 | 2018-04-24 | 杨曙铭 | A kind of mechanics apparatus for demonstrating |
| CN108550307A (en) * | 2018-07-02 | 2018-09-18 | 广东电网有限责任公司 | Mobile side dumper |
| CN109118905A (en) * | 2018-10-18 | 2019-01-01 | 潘天宇 | A kind of physical experiment demonstration device |
| CN109859581A (en) * | 2019-04-03 | 2019-06-07 | 潘洁熙 | A kind of high school physics uniform variable motion experiment comparison apparatus |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2413328Y (en) * | 1999-12-08 | 2001-01-03 | 王郁知 | Newton's second law demonstrating device |
| CN101170273A (en) * | 2006-10-24 | 2008-04-30 | 陈祖茂 | Magnetic force braking device |
| CN102509495A (en) * | 2011-11-25 | 2012-06-20 | 长春工业大学 | Verification device for Newton second law |
| JP2012228120A (en) * | 2011-04-21 | 2012-11-15 | Railway Technical Research Institute | Railway rail brake cum contactless power supply apparatus |
| CN203773798U (en) * | 2014-04-02 | 2014-08-13 | 石小明 | A ticker timer experiment control device |
| CN104554415A (en) * | 2015-01-26 | 2015-04-29 | 昆山威凯儿童用品有限公司 | Brake system of stroller |
-
2017
- 2017-09-18 CN CN201710842936.2A patent/CN107578676B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2413328Y (en) * | 1999-12-08 | 2001-01-03 | 王郁知 | Newton's second law demonstrating device |
| CN101170273A (en) * | 2006-10-24 | 2008-04-30 | 陈祖茂 | Magnetic force braking device |
| JP2012228120A (en) * | 2011-04-21 | 2012-11-15 | Railway Technical Research Institute | Railway rail brake cum contactless power supply apparatus |
| CN102509495A (en) * | 2011-11-25 | 2012-06-20 | 长春工业大学 | Verification device for Newton second law |
| CN203773798U (en) * | 2014-04-02 | 2014-08-13 | 石小明 | A ticker timer experiment control device |
| CN104554415A (en) * | 2015-01-26 | 2015-04-29 | 昆山威凯儿童用品有限公司 | Brake system of stroller |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107958621A (en) * | 2018-01-25 | 2018-04-24 | 杨曙铭 | A kind of mechanics apparatus for demonstrating |
| CN108550307A (en) * | 2018-07-02 | 2018-09-18 | 广东电网有限责任公司 | Mobile side dumper |
| CN108550307B (en) * | 2018-07-02 | 2023-06-23 | 广东电网有限责任公司 | Mobile side-tipping vehicle |
| CN109118905A (en) * | 2018-10-18 | 2019-01-01 | 潘天宇 | A kind of physical experiment demonstration device |
| CN109859581A (en) * | 2019-04-03 | 2019-06-07 | 潘洁熙 | A kind of high school physics uniform variable motion experiment comparison apparatus |
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| Publication number | Publication date |
|---|---|
| CN107578676B (en) | 2019-08-20 |
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