CN106128232A - A kind of variable element circle fan annular demonstration and arc length area measuring device - Google Patents
A kind of variable element circle fan annular demonstration and arc length area measuring device Download PDFInfo
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- CN106128232A CN106128232A CN201610742245.0A CN201610742245A CN106128232A CN 106128232 A CN106128232 A CN 106128232A CN 201610742245 A CN201610742245 A CN 201610742245A CN 106128232 A CN106128232 A CN 106128232A
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- bracket
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- gate
- rectangular
- radial link
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/02—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for mathematics
- G09B23/04—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for mathematics for geometry, trigonometry, projection or perspective
Abstract
nullThe invention discloses a kind of variable element circle fan annular demonstration and arc length area measuring device，Including disk bracket、Fan-shaped disk cover、Protection gate、Radial link、Elastic slat、Rectangular bracket and vernier ruler，Described protection gate and radial link are respectively arranged on disk bracket，And protection gate is perpendicular with radial link，Elastic slat is that arc-shaped is placed on disk bracket，And the two ends of elastic slat are connected with protection gate and radial link respectively，Fan-shaped disk cover is covered on elastic slat，Rectangular bracket is located on disk bracket，And adjacent two right-angle sides of rectangular bracket touch mutually with protection gate and radial link respectively，Vernier ruler is located on rectangular bracket，Radial link push-and-pull elastic slat carries out the conversion of circular arc and straight line between disk bracket and rectangular bracket，Then realize circle fan annular and arrive triangle or trapezoidal demonstration and area measurement.The present invention is simple to operate, and the suitability is strong, with low cost, easy to carry.
Description
Technical field:
The present invention relates to a kind of variable element circle fan annular demonstration and arc length area measuring device.
Background technology:
The knowledge of the figures such as the circle that is made up of circular arc, sector, fan annular, arch, be the important content that must be learned by of middle and primary schools it
One, be also figure most commonly used in all trades and professions and daily life, due to circular arc unlike straight line directly perceived, during teachers ' teaching
Lacking suitable teaching aid, the most difficult the such issues that of performance, student is the most readily understood in learning process, asks arc length and area formula
Memory gets up easily to obscure, and teacher is badly in need of teaching aid or the survey tool of some more science and is carried out aided education, and student is also required to one
Being prone to the apparatus of study a bit, engineers and technicians need survey tool easily.
In order to solve the problems referred to above, the nearly stage also occur in that minority relate to circular sector in terms of device, e.g., number of patent application
Being to give " a kind of circle area demonstrator " in the document of 201110273519.3, it is according to the sector introduced on Mathematics Teaching Material
Cut off method, the big secter pat arc surfaces having patch such as odd number are divided into and are the most all adhered on two edge strips, form one
The disk completed, the sector of two semicircles, separately and correspondence is intersected, and forms the approximate rectangular of a curved side, passes through rectangular surfaces
The product representation area of a circle, obtains the area formula of circle, and owing to fan-shaped block number divides less, the limit of rectangle is not straight line, demonstration effect
Really inaccuracy, particularly can not solve arbitrarily to fan the relevant issues of annular；Number of patent application is the document of 201510189586.5
In give " area of a circle size illusion demonstrator ", can clearly demonstrate and beneficially illusion differentiate the area of a circle size illusion demonstration
Instrument, it is impossible to solve the problems such as arc length and the graphics area that is made up of circular arc.
Therefore, necessary prior art improves to solve the deficiency of prior art.
Summary of the invention:
The present invention is in order to solve the problem of above-mentioned prior art existence and to provide a kind of variable element circle fan annular to demonstrate and arc length
Area measuring device.
The technical solution adopted in the present invention has: a kind of variable element circle fan annular demonstration and arc length area measuring device, bag
Include disk bracket, fan-shaped disk cover, protection gate, radial link, elastic slat, rectangular bracket and vernier ruler, described protection
Gate and radial link are respectively arranged on disk bracket, and protection gate is perpendicular with radial link, and elastic slat is arc-shaped
Being placed on disk bracket, and the two ends of elastic slat are connected with protection gate and radial link respectively, fan-shaped disk cover is covered on bullet
Property lath on, rectangular bracket is located on disk bracket, and adjacent two right-angle sides of rectangular bracket respectively with protection gate and radially
Connecting rod touches mutually, and vernier ruler is located on rectangular bracket, radial link push-and-pull elastic slat disk bracket and rectangular bracket it
Between carry out the conversion of circular arc and straight line, then realize circle fan annular to triangle or trapezoidal demonstration and area measurement.
Further, described disk bracket includes disk, pulley bracket, fixed pulley, vertical shaft, spoke, footpath way roller, fixture
Support and alligator clamp, described pulley bracket is fixed on disk, and some fixed pulleys are rotationally connected with along the circumferencial direction of disk
On disk, and fixed pulley is positioned at the inner side of pulley bracket, and vertical shaft is placed in the center of disk, and seven spokes are along the circumference side of disk
To being located between pulley bracket and vertical shaft, fixture mount is fixed on spoke described in, and alligator clamp is fixed in fixture mount, and six
Root footpath way roller rotates and is located on spoke described in the other six roots of sensation；Described protection gate and radial link are respectively placed in orthogonal
At described two spokes, elastic slat is that arc-shaped overlap is placed on tangential roller, and fan-shaped disk cover covers above elastic slat.
Further, described fan-shaped disk cover includes a transparent cover plate, has vertical shaft hole, transparency cover at the center of transparent cover plate
Plate is provided with arc groove, and the inward flange along arc groove is provided with circular arc scale, and the dual-side of transparent cover plate is provided with slide-rule dial.
Further, described protection gate includes rectangular base plate, door frame, the 3rd gate and door lock ditch, and described door frame is solid
In rectangular base plate, door frame is provided with rectangular-shaped door opening, above door frame and just to having the 3rd gate slot at door opening, the
Three gates are located in the 3rd gate slot, in rectangular base plate and be positioned at the underface of the 3rd gate and have door lock ditch.
Further, described radial link includes rectangle connecting rod, gap gate, push rod, the 4th roller, handle and set
Ring, described rectangle connecting rod is provided with the 4th gate slot, and gap gate is located in the 4th gate slot, and push rod is fixedly connected on rectangle
On connecting rod, and the lower end of push rod through rectangle connecting rod and is connected with the 4th roller, and handle is fixed on the top of push rod, and the collar is fixed
On the sidewall of rectangle connecting rod.
Further, described elastic slat includes rectangular strip body, draw back plate, guiding leg, display lamp and goalpost, institute
State draw back plate, guiding leg, display lamp and goalpost to be all connected on rectangular strip body.
Further, described rectangular bracket includes rectangular substrate, left slideway, right slideway, front vertical plate and back vertical plate, a described left side
Slideway, right slideway, front vertical plate and back vertical plate are correspondingly arranged on four sides of rectangular substrate respectively, set in rectangular substrate
Having some straight line grooves, have passageway in left slideway bottom, the edge in rectangular substrate is provided with the 6th pin hole.
Further, described vernier ruler includes ruler plate, vernier, left slider and right slide block, left slider and right slide block
Being respectively fixedly connected with the both sides at ruler plate, vernier is located on ruler plate；Left slider with right slide block are equipped with T-shaped groove.
There is advantages that
The present invention is simple to operate, as long as promoting handle just can complete demonstration and numerical measuring after being completed；The suitability is strong: select
Different radii and central angle can complete the functions such as the equivalance demonstration of multiple figure, arc length measurement and area letter calculation；With low cost, take
Band is convenient, can be placed in a writing case.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the structural representation of disk bracket in the present invention.
Fig. 3 is the structural representation of fan-shaped disk cover in the present invention.
Fig. 4 is the structural representation protecting gate in the present invention.
Fig. 5 is the structural representation of radial link in the present invention.
Fig. 6 is the structural representation of Elastic lath of the present invention.
Fig. 7 is the structural representation of rectangular bracket in the present invention.
Fig. 8 is the structural representation of vernier ruler in the present invention.
Detailed description of the invention:
The present invention is further illustrated below in conjunction with the accompanying drawings.
Such as Fig. 1, one variable element of the present invention circle fan annular demonstration and arc length area measuring device, including disk bracket 1, fan
Shape disk cover 2, protection gate 3, radial link 4, elastic slat 5, rectangular bracket 6 and vernier ruler 7, protection gate 3 and radial direction
Connecting rod 4 is respectively arranged on disk bracket 1, and protection gate 3 is perpendicular with radial link 4, and elastic slat 5 is placed in circle in arc-shaped
In disc holder 1, and the two ends of elastic slat 5 are connected with protection gate 3 and radial link 4 respectively, and fan-shaped disk cover 2 is covered on elasticity
On lath 5, rectangular bracket 6 is located on disk bracket 1, and adjacent two right-angle sides of rectangular bracket 6 respectively with protection gate 3 and footpath
Touching to connecting rod 4 phase, two vernier rulers 7 are located on rectangular bracket 6, and radial link 4 push-and-pull elastic slat 5 is at disk bracket 1
And carry out the conversion of circular arc and straight line between rectangular bracket 6, then realize circle fan annular and arrive triangle or trapezoidal demonstration and face
Long-pending measurement.
Such as Fig. 2, the disk bracket 1 in the present invention includes disk 11, is provided with pulley bracket 12, at pulley on disk 11
Equipped with fixed pulley 13 inside support 12, it is provided with cylinder vertical shaft 14 at the center of disk 11, between vertical shaft 14 and pulley bracket 12
It is provided with seven spokes 15, in piece fixture mount 19 of spoke described in one 15 extenal fixation, fixture mount 19 is provided with multiple spring
Folder 110.It is first spoke to be fixed with the spoke 15 of fixture mount 19, the most in the direction of the clock remaining second to
Tangential roller 16 it is equipped with on seven spokes 15.Below the outer edge of disk 11, be provided with lower facade 17, disk first as
Have pin the first pin 18 at limit, have the first fixing hole 111 to fourth quadrant edge at the second of disk.Protection gate 3 with
Radial link 4 is respectively placed at first on disk bracket 1, seven spokes 15, and elastic slat 5 is placed in tangentially in arc-shaped overlap
On roller 16, fan-shaped disk cover 2 covers above elastic slat 5, and rectangular bracket 6 is fixed at the first quartile on disk bracket 1
And it is adjacent with radial link 4 with protection gate 3.Vernier ruler 7 is placed on rectangular bracket 6.Radial link 4 push-and-pull elastic slat 5
The conversion of circular arc and straight line can be carried out between disk bracket 1 and rectangular bracket 6, be achieved in circle fan annular to triangle or ladder
The demonstration of shape and area measurement function.
Such as Fig. 3, fan-shaped disk cover 2 includes transparent cover plate 21 and alien invasion 22, and the center of arc at transparent cover plate 21 has vertical
Axis hole 24, the arc edge at transparent cover plate 21 has arc groove 23, and the inward flange along arc groove 23 is provided with circular arc scale 25,
Being equipped with slide-rule dial 26 on two straight flanges of transparent cover plate 21, the outward flange at arc groove 23 has the second fixing hole 27.Fan-shaped
Disk cover 2 by the vertical shaft 14 that be fixed on disk bracket 1 on corresponding with the second fixing hole 27 of the vertical shaft hole 24 on transparent cover plate 21 and
At first fixing hole 111, and alien invasion 22 wraps in outside lower facade 17.
Such as Fig. 4, protection gate 3 includes rectangular base plate 31, door frame 32 and the 3rd gate 35, and door frame 32 is fixed on rectangular base plate
Above 31, the rectangle door opening 33 of depression is left in the front end of door frame 32, has the 3rd lock on door frame 32 at upright opposite house hole 33
Gate slot 34, at the 3rd gate slot 34 built with the 3rd gate 35, in rectangular base plate 31 and be positioned at the underface of the 3rd gate 35
Have door lock ditch 36, be provided with screw hole 37 at the two ends of rectangular base plate 31.Protection gate 3 is fixed on disk torr by screw hole 37
At 7th spoke 15 of frame 1.
Such as Fig. 5, radial link 4 includes rectangle connecting rod 41, gap gate 44, push rod 45 and the 4th roller 46, at rectangle even
Have gate hole 42 before bar 41, on gate hole 42, have the 4th gate slot 43, the 4th gate slot 43 built with
Gap gate 44, rectangle connecting rod 41 is provided with push rod 45, and the lower end of push rod 45 is connected with equipped with the 4th roller 46, the upper end of push rod 45
Handle 47, rectangle connecting rod 41 is provided with the collar 48.Radial link 4 is enclosed within the vertical shaft 14 of disk bracket 1 by the collar 48.
Such as Fig. 6, elastic slat 5 includes rectangular strip body 51, draw back plate 52, guides leg 53, display lamp 58 and goalpost
510, the surface of rectangular strip body 51 is to be front facade 54, rear facade 55, upper section 56, lower section 57, left facade 59 and respectively
Right facade 511, forward and backward facade is smooth, and indeformable during one-tenth circular arc, the left end at upper section 56 is provided with draw back plate 52, right-hand member
It is provided with display lamp 58.Right-hand member at lower section 57 is provided with guiding leg 53, is provided with goalpost 510 on left facade 59.Elastic slat 5
Lower section 57 be placed on footpath way roller 16, draw back plate 52 is placed in the gate hole 42 of radial link 4, guide leg 53 be placed in guarantor
Protect in the door opening 33 of gate 3.
Such as Fig. 7, rectangular bracket 6 includes rectangular substrate 61, straight line groove 62, left slideway 63, right slideway 64, front vertical plate 65 and
Back vertical plate 66, the upper surface in rectangular substrate 61 has an a plurality of parallel straight line groove 62, left slideway 63, right slideway 64, front vertical
Plate 65, back vertical plate 66 are vertically fixed on the four edges of rectangular substrate 61 successively, have passageway 67, at square in left slideway 63 bottom
The edge of shape substrate 61 has the 6th pin hole 68.Rectangular bracket 6 be fixed on disk bracket 1 by the 6th pin hole 68 the
One pin hole 18, passageway 67 connects with the door opening 33 of protection gate 3.
Such as Fig. 8, vernier ruler 7 includes ruler plate 71, vernier 73, left slider 74 and right slide block 75, and ruler plate 71 is one
Straight hardboard, has length scale 72, vernier 73 to be stuck on ruler plate 71 above, and the two ends, left and right of ruler plate 71 are separately fixed at left cunning
The right slide block of block 74 7) on, below left slider 74 and right slide block 75, it being designed with the groove 76 of "T"-shaped shape, vernier ruler 7 is by a left side
Groove 76 on the right slide block of slide block 74 75 is connected on the right slideway of left slideway 63 64 of rectangular bracket 6.
The operation principle of the present invention is, is all constant according to circular arc and straight curvature of a curve, the circular arc rotated around the center of circle
Be converted on circular arc the isometric tangent line of certain point, the circular arc of continuous radius the circular sector homalographic covered becomes what straightway covered
Right angled triangle.
The present invention has demonstration and measures function, can demonstrate circular arc change and the circular sector area change relation of different parameters
And calculate its value, operating procedure is:
1) assemble: have the one of pulley bracket to face up on disk bracket, at the 7th spoke, fix protection gate, mention the
Three gates make door opening be opening state, the draw back plate of elastic slat are passed upward protection gate, counterclockwise side from door opening right
To promoting elastic slat to move along fixed pulley, goalpost is stuck in the alligator clamp of disk bracket, guides leg and stay the 3rd gate
Press the 3rd gate time interior, all elastic slats are arranged formation circular sector from outside to inside by length order.Radial link
The collar is enclosed within the king of disk bracket, and the draw back plate of elastic slat is pressed on rectangle connecting rod, is worn by sector disk cover
Cross the push rod of radial link and cover on disk bracket and make it fix, the straight line groove of rectangular bracket is directed at the 3rd
Fix after the guiding leg of elastic slat in gate.The slide block of two vernier rulers is stuck in the left and right cunning of rectangular bracket
On road.
2) original state adjusts: the two-end-point adjusting all elastic slats is on straight line, and radial link is in sector
At on disk cover 0 degree, the arc radius to demonstration (or measurement) figure isCentral angle is(For radian) time,
Press and be in radial linkIn the range of those gap gates, and make gap be stuck in goalpost, mention and be in
Those gap gates, protection gate at find calibration points, press and be inThose the 3rd gates, mentionIn the range of those the 3rd gates, and open the display lamp on elastic slat, adjust a vernier ruler on rectangular bracket
WithThe round tangent line at place is consistent, and vernier slides into 0 scale.
3) demonstration: catching measurement apparatus main body motionless on the other hand, another hands catches push rod handle, the most push-jump radial direction
Connecting rod, is inIn the range of elastic slat display lamp along rectangular bracket straight line groove straight line launch,Place
Elastic slat front end promotes vernier to advance, and arrives angle in radial linkStopping push-jump during place, vernier is parked in ruler
Place,The reading at place is exactly that radius isCentral angle isCircular arc long, it is parked in rectangle torr
The upper section of the elastic slat part of frame lines up a right angled triangle(For disc centre point), display lamp exists entirely
On, right angled triangleAreaIt is exactly that radius isCentral angle isThe face of circular sector
Long-pending；
4) terminate: push-jump radial link counterclockwise returns to, at 0 radian, press and be inThose the 3rd gates, adjust rectangle
Frame pressed close to by vernier ruler on bracket.
The present invention can demonstrate different parameters circle fan annulus area variation relation and measurement calculate area value, operating procedure quickly
It is:
A) assemble: with above-mentioned steps 1) identical；
B) original state adjust: to demonstrate or measure radius byArriveCentral angle is(For radian) fan
Annular, presses and is in radial linkIn the range of those gap gates, and make gap be stuck in goalpost, mention
It is inThose gap gates, protection gate at find calibration points,, press and be inThose the 3rd gates, mentionIn the range of those the 3rd gates, and open on elastic slat
Display lamp, adjust on rectangular bracket two vernier rulers respectively with、The round tangent line at place is consistent, and by vernier
All slide into 0 scale；
C) demonstration: catching measurement apparatus main body motionless on the other hand, another hands catches push rod handle, the most push-jump radial direction to connect
Bar, is inIn the range of elastic slat display lamp along rectangular bracket straight line groove straight line launch,,The elastic slat front end at place promote vernier I, vernier II advance (for convenience of the vernier distinguished in two vernier rulers 7, therefore
Enter to distinguish with vernier I, vernier II respectively by the vernier in two vernier rulers 7), arrive angle in radial linkDuring place
Stopping push-jump, vernier I is at vernier rulerPlace, vernier II is parked inPlace, is parked in elastic slat part upper of rectangular bracket
Cross section forms a right angle isosceles trapezoid,AreaIt it is exactly circle fan ring
The area of shape。
D) terminate: with above-mentioned steps 4) identical.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, can also make some improvement under the premise without departing from the principles of the invention, these improvement also should be regarded as the present invention's
Protection domain.
Claims (8)
1. a variable element circle fan annular demonstration and arc length area measuring device, it is characterised in that: include disk bracket (1), fan
Shape disk cover (2), protection gate (3), radial link (4), elastic slat (5), rectangular bracket (6) and vernier ruler (7), described
Protection gate (3) and radial link (4) are respectively arranged on disk bracket (1), and protection gate (3) is hung down mutually with radial link (4)
Directly, elastic slat (5) is placed in arc-shaped on disk bracket (1), and the two ends of elastic slat (5) respectively with protection gate (3)
Being connected with radial link (4), fan-shaped disk cover (2) is covered on elastic slat (5), and rectangular bracket (6) is located at disk bracket (1)
On, and adjacent two right-angle sides of rectangular bracket (6) touch mutually with protection gate (3) and radial link (4) respectively, vernier ruler
(7) being located on rectangular bracket (6), radial link (4) push-and-pull elastic slat (5) is between disk bracket (1) and rectangular bracket (6)
Carry out the conversion of circular arc and straight line, then realize circle fan annular and arrive triangle or trapezoidal demonstration and area measurement.
2. variable element circle fan annular demonstration as claimed in claim 1 and arc length area measuring device, it is characterised in that: described circle
Disc holder (1) include disk (11), pulley bracket (12), fixed pulley (13), vertical shaft (14), spoke (15), footpath way roller (16),
Fixture mount (19) and alligator clamp (110), described pulley bracket (12) is fixed on disk (11), some fixed pulleys (13) edge
The circumferencial direction of disk (11) is rotationally connected with on disk (11), and fixed pulley (13) is positioned at the inner side of pulley bracket (12), vertical
Axle (14) is placed in the center of disk (11), seven spokes (15) along the circumferencial direction of disk (11) be located at pulley bracket (12) with
Between vertical shaft (14), fixture mount (19) is fixed on spoke described in (15), and alligator clamp (110) is fixed on fixture mount (19)
On, six roots of sensation footpath way roller (16) rotates and is located on spoke (15) described in the other six roots of sensation；Described protection gate (3) and radial link
(4) being respectively placed in orthogonal described two spokes (15) place, elastic slat (5) is placed in tangential roller (16) in arc-shaped overlap
On, fan-shaped disk cover (2) covers the top in elastic slat (5).
3. variable element circle fan annular demonstration as claimed in claim 1 and arc length area measuring device, it is characterised in that: described fan
Shape disk cover (2) includes a transparent cover plate (21), has vertical shaft hole (24) at the center of transparent cover plate (21), on transparent cover plate (21)
Being provided with arc groove (23), the inward flange along arc groove (23) is provided with circular arc scale (25), and the dual-side of transparent cover plate (21) sets
There is slide-rule dial (26).
4. variable element circle fan annular demonstration as claimed in claim 1 and arc length area measuring device, it is characterised in that: described guarantor
Protecting gate (3) and include rectangular base plate (31), door frame (32), the 3rd gate (35) and door lock ditch (36), described door frame (32) is solid
In rectangular base plate (31), door frame (32) is provided with rectangular-shaped door opening (33), in door frame (32) top and just to door opening
(33) place has the 3rd gate slot (34), and the 3rd gate (35) is located in the 3rd gate slot (34), in rectangular base plate (31)
And the underface being positioned at the 3rd gate (35) has door lock ditch (36).
5. variable element circle fan annular demonstration as claimed in claim 1 and arc length area measuring device, it is characterised in that: described footpath
Rectangle connecting rod (41), gap gate (44), push rod (45), the 4th roller (46), handle (47) and the collar is included to connecting rod (4)
(48), described rectangle connecting rod (41) is provided with the 4th gate slot (43), and gap gate (44) is located in the 4th gate slot (43),
Push rod (45) is fixedly connected on rectangle connecting rod (41), and the lower end of push rod (45) through rectangle connecting rod (41) and with the 4th roller
(46) being connected, handle (47) is fixed on the top of push rod (45), and the collar (48) is fixed on the sidewall of rectangle connecting rod (41).
6. variable element circle fan annular demonstration as claimed in claim 1 and arc length area measuring device, it is characterised in that: described bullet
Property lath (5) include rectangular strip body (51), draw back plate (52), guide leg (53), display lamp (58) and goalpost (510),
Described draw back plate (52), guiding leg (53), display lamp (58) and goalpost (510) are all connected on rectangular strip body (51).
7. variable element circle fan annular demonstration as claimed in claim 1 and arc length area measuring device, it is characterised in that: described square
Shape bracket (6) includes rectangular substrate (61), left slideway (63), right slideway (64), front vertical plate (65) and back vertical plate (66), a described left side
Slideway (63), right slideway (64), front vertical plate (65) and back vertical plate (66) are correspondingly arranged at four sides of rectangular substrate (61) respectively
Bian Shang, is provided with some straight line grooves (62) in rectangular substrate (61), has passageway (67) in left slideway (63) bottom, at square
The edge of shape substrate (61) is provided with the 6th pin hole (68).
8. variable element circle fan annular demonstration as claimed in claim 1 and arc length area measuring device, it is characterised in that: described trip
Mark ruler (7) includes ruler plate (71), vernier (73), left slider (74) and right slide block (75), left slider (74) and right slide block
(75) being respectively fixedly connected with in the both sides of ruler plate (71), vernier (73) is located on ruler plate (71)；At left slider (74) with right
T-shaped groove (76) it is equipped with on slide block (75).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610742245.0A CN106128232B (en) | 2016-08-29 | 2016-08-29 | Variable parameter circular fan annular demonstration and arc length area measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610742245.0A CN106128232B (en) | 2016-08-29 | 2016-08-29 | Variable parameter circular fan annular demonstration and arc length area measurement device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106128232A true CN106128232A (en) | 2016-11-16 |
| CN106128232B CN106128232B (en) | 2022-04-01 |
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|---|---|
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