CN104217642B - One changes face method teaching aid apparatus for demonstrating - Google Patents
One changes face method teaching aid apparatus for demonstrating Download PDFInfo
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- CN104217642B CN104217642B CN201410535653.XA CN201410535653A CN104217642B CN 104217642 B CN104217642 B CN 104217642B CN 201410535653 A CN201410535653 A CN 201410535653A CN 104217642 B CN104217642 B CN 104217642B
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Abstract
One changes face method teaching aid apparatus for demonstrating, including space surface construction mechanism, space line constructive mechanism, rotating mechanism, slide block guide rail mechanism, double-slider endplay device, space framework and base, described space surface construction mechanism and space line constructive mechanism are arranged on the upper end of space framework；Described rotating mechanism is vertically set on the inner hub location of space framework；Described slide block guide rail mechanism is arranged on the left end outside space framework；Described double-slider endplay device is arranged on the inside of space framework.The written projection teaching of abstract can be realized material objectization, materialization, the teaching of three-dimensional by the present invention, three-dimensional to the principle and process of changing face method can be showed student, student is not only allowed to deepen the understanding of exchange face method, it is also used as the instrument of solving a problem, the course of solving questions allowing student exchange face method has more deep understanding, and compact conformation, simple, and part process is simply easy to manufacture, failure rate is low, volume is little simultaneously is easy to carry.
Description
Technical field
The invention belongs to teaching tool technical field, especially relate to a kind of teaching aid that the face method of changing is carried out space multistory displaying.
Background technology
Mechanical drawing is the core curriculum of mechanical speciality, and it is very important for allowing the course in terms of the good mechanical drawing of students.During College Project drawing teaching now, face method teaching, the always difficult point in difficult point in teaching are changed for point-line-surface.Due to its abstractness, if teacher does not has particularly intuitive solid show during face method relative theory is changed in explanation, there is bigger difficulty in students' union in understanding process.Often there is obstacle when the position relationship of the plane constructed by understanding in student, it is not known that the mutual alignment relation between each plane in three dimensions.Up to the present, there is no for the concrete practical teaching aid changing face method demonstration, therefore need badly in the middle of prior art and want a kind of novel technical scheme to solve this problem.
Summary of the invention
The technical problem to be solved is: provide one to change face method teaching aid apparatus for demonstrating, the written projection teaching of abstract can be realized material objectization, materialization, the teaching of three-dimensional, three-dimensional to the principle and process of changing face method can be showed student, student is not only allowed to deepen the understanding of exchange face method, it is also used as the instrument of solving a problem, the course of solving questions allowing student exchange face method has more deep understanding, and it is compact conformation, simple, part process is simply easy to manufacture, failure rate is low, volume is little simultaneously is easy to carry.
One changes face method teaching aid apparatus for demonstrating, it is characterized in that: include that space surface construction mechanism, space line constructive mechanism, rotating mechanism, slide block guide rail mechanism, double-slider endplay device and space framework, described space surface construction mechanism and space line constructive mechanism are arranged on the upper end of space framework；Described rotating mechanism is vertically set on the inner hub location of space framework；Described slide block guide rail mechanism is arranged on the left end outside space framework；Described double-slider endplay device is arranged on the inside of space framework；Described chassis interior is driven by motor equipped with worm-and-wheel gear, worm screw, and worm gear is connected with the main shaft of rotating mechanism, carrys out the angle change of automatic accurate control rotating mechanism with realization infrared remote control；
Described space surface construction mechanism includes showing point I, long connecting rod, contiguous block, short connecting rod, pole I, bearing I, bearing, and described long connecting rod and pole I are by bolted splice, and described short connecting rod passes through bolted splice with the contiguous block being enclosed within long connecting rod；Described pole I is connected with bearing by bearing I, and pole I is to be fastenedly connected with bearing I, and bearing I is to be fastenedly connected with the hole on bearing；Described displaying point I is set to three, is respectively arranged at the two ends of long connecting rod and the movable end of short connecting rod；
Described space line constructive mechanism includes showing point II, stock, pole II, base, bearing II, described stock and pole II pass through bolted splice, described pole II is connected with base by bearing II, pole II and bearing II tight fit, and bearing II is tight fit with the hole on base；Described displaying point II is set to two, is separately positioned on the two ends of stock；
Described rotating mechanism includes that axle, thrust ball bearing, pad, taper roll bearing, nut, described pad are arranged on the chien shih taper roll bearing of taper roll bearing and thrust ball bearing and thrust ball bearing circular-rotation is connected；Described axle is fixedly connected on the bottom surface of space framework by nut in the vertical direction；
Described slide block guide rail mechanism includes projection plate I, fixing seat, fixed block I, baffle plate, guide rail I, slider I, described fixed block I is bolted to connection with projection plate I, described baffle plate is connected by bolt is fixing with fixed block I, it is right that described fixing seat is set to two, described guide rail I is set to two, every pair of fixing seat and a guide rail I coordinate to be installed, two fixing seats in every pair of fixing seat are separately positioned on the two ends of every guide rail I, described slider I is set to two, is flexibly connected with every guide rail I by bearing respectively；
Described double-slider endplay device includes support bar I, contiguous block, fixed block II, support bar II, block, support bar III, locating piece, slide block II, guide rail II, supporting plate, fixed block III, slideway, limited block, pull bar, projection plate II, described supporting plate is rectangle, it is bolted the top being arranged on rotating mechanism, described support bar I is set to two, it is bolted respectively on the two ends being arranged on supporting plate, described support bar II and support bar III are respectively set to two, every support bar II is slidably connected with support bar I by block respectively, two support bars III pass sequentially through with two support bars II head and the tail that bolt is fixing to be connected, form a rectangle bracing frame；It is two right that described locating piece is set to, and is respectively and fixedly installed on two bracing frames III, and two guide rails II are fixed with bracing frame III by locating piece respectively and are connected；Described slide block II is connected by screw is fixing with fixed block II, and described fixed block II is connected by pin with contiguous block, and described fixed block III is connected by pin with contiguous block；Described slideway is bolted and is arranged on supporting plate, and the head and end of slideway is fixedly installed limited block, and pull bar is L-type, and the minor face of L-type is fixing with projection plate II to be connected, and the long limit of L-type is inserted inside slideway, is flexibly connected with the inwall of slideway.
Described space framework includes that base plate, top board, support, described base plate and top board are regular hexagon structure, and described support is set to the six roots of sensation, and two end points of support are respectively and fixedly installed on orthohexagonal six summits.
Described base includes that MCU master controller, infrared receiving terminal, motor, motor drive plate, worm screw, bearing block, worm gear, base shell, described infrared receiving terminal is fixed on the outside of base shell, to receive the signal that remote control sends, motor drives worm screw, and worm gear is connected with the main shaft of rotating mechanism.
Described fixed block II, contiguous block and fixed block III material all select nylon material.
Described base plate, top board and support material all select titanium alloy material.
By above-mentioned design, the present invention can bring following beneficial effect: one changes face method teaching aid apparatus for demonstrating, the written projection teaching of abstract can be realized material objectization, materialization, the teaching of three-dimensional, three-dimensional to the principle and process of changing face method can be showed student, student is not only allowed to deepen the understanding of exchange face method, it is also used as the instrument of solving a problem, the course of solving questions allowing student exchange face method has more deep understanding, and it is compact conformation, simple, part process is simply easy to manufacture, failure rate is low, volume is little simultaneously is easy to carry.Space surface construction mechanism is achieved by the bearing connection of hinged Special composition linkage, base and pole between each connecting rod can be by the function of 3 formation levels at any space plane；Space line constructive mechanism connects the function achieving structure space arbitrary line by the bearing of hinged Special composition linkage, base and pole between each connecting rod；Rotating mechanism connects the function that can rotate in a circumferential direction the while of achieving vertical direction fastening by bearing.With cheap, the infrared remote control of signal stabilization controls teaching aid, makes teaching aid more practical, and intelligent, promotional value is higher.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated:
Fig. 1 is that one of the present invention changes face method teaching aid apparatus for demonstrating overall structure schematic diagram.
Fig. 2 is that one of the present invention changes method teaching aid apparatus for demonstrating space, face surface construction structural scheme of mechanism.
Fig. 3 is that one of the present invention changes face method teaching aid apparatus for demonstrating space line constructive mechanism schematic diagram.
Fig. 4 is that one of the present invention changes face method teaching aid apparatus for demonstrating rotating mechanism schematic diagram.
Fig. 5 is that one of the present invention changes face method teaching aid apparatus for demonstrating slide block guide rail structural scheme of mechanism.
Fig. 6 is that one of the present invention changes face method teaching aid apparatus for demonstrating double-slider endplay device front schematic view.
Fig. 7 is that one of the present invention changes face method teaching aid apparatus for demonstrating double-slider endplay device side schematic view.
Fig. 8 is that one of the present invention changes face method teaching aid apparatus for demonstrating chassis interior texture edge schematic diagram.
nullWherein 1-space surface construction mechanism、101-shows point I、102-long connecting rod、103-contiguous block、104-short connecting rod、105-pole I、106-bearing I、107-bearing、2-space line constructive mechanism、201-shows point II、202-stock、203-pole II、204-base、205-bearing II、3-rotating mechanism、301-axle、302-thrust ball bearing、303-pad、304-taper roll bearing、305-nut、4-slide block guide rail mechanism、401-projection plate I、402-fixes seat、403-fixed block I、404-baffle plate、405-guide rail I、406-slider I、5-double-slider endplay device、501-support bar I、502-contiguous block、503-fixed block II、504-support bar II、505-block、506-support bar III、507-locating piece、508-slide block II、509-guide rail II、510-supporting plate、511-fixed block III、512-slideway、513-limited block、514-pull bar、515-projection plate II、516-pin、6-space framework、601-base plate、602-top board、603-support、701-MCU master controller、702-infrared receiving terminal、703-motor，704-motor drives plate、705-worm screw、706-bearing block、707-worm gear、708-base shell.
Detailed description of the invention
One changes face method teaching aid apparatus for demonstrating, as shown in Figure 1, including space surface construction mechanism 1, space line constructive mechanism 2, rotating mechanism 3, slide block guide rail mechanism 4, double-slider endplay device 5 and space framework 6, described space surface construction mechanism 1 and space line constructive mechanism 2 are arranged on the upper end of space framework 6；Described rotating mechanism is vertically set on the inner hub location of space framework 6；Described slide block guide rail mechanism 4 is arranged on the left end outside space framework 6；Described double-slider endplay device 5 is arranged on the inside of space framework 6.
Space surface construction mechanism 1 is as shown in Figure 2, show point I 101, long connecting rod 102, contiguous block 103, short connecting rod 104, pole I 105, bearing I 106, bearing 107, described long connecting rod 102 and pole I 105 are by bolted splice, and described short connecting rod 104 passes through bolted splice with the contiguous block 103 being enclosed within long connecting rod 102；Described pole I 105 is connected with bearing 107 by bearing I 106, and pole I 105 is to be fastenedly connected with bearing I 106, and bearing I 106 is to be fastenedly connected with the hole on bearing 107；Described displaying point I 101 is set to three, is respectively provided with two ends and the movable end of short connecting rod 104 of long connecting rod 102；Space surface construction mechanism is achieved by the bearing connection of hinged Special composition linkage, base and pole between each connecting rod can be by the function of 3 formation levels at any space plane.
Space line constructive mechanism 2 is as shown in Figure 3, including showing point II 201, stock 202, pole II 203, base 204, bearing II 205, described stock 202 passes through bolted splice with pole II 203, described pole II 203 is connected with base 204 by bearing II 205, pole II 203 and bearing II 205 tight fit, bearing II 205 is tight fit with the hole on base 204；Described displaying point II 201 is set to two, is separately positioned on the two ends of stock 202；Space line constructive mechanism connects the function achieving structure space arbitrary line by the bearing of hinged Special composition linkage, base and pole between each connecting rod.
Rotating mechanism 3 is as shown in Figure 4, including axle 301, thrust ball bearing 302, pad 303, taper roll bearing 304, nut 305, described pad 303 is arranged on the chien shih taper roll bearing 304 of taper roll bearing 304 and thrust ball bearing 302 and thrust ball bearing 302 circular-rotation is connected；Described axle 301 is fixedly connected on the bottom surface of space framework 6 by nut 305 in the vertical direction；Connected by bearing and achieve the function that vertical direction fastening can rotate in a circumferential direction simultaneously.
Slide block guide rail mechanism 4 is as shown in Figure 5, including projection plate I 401, fixing seat 402, fixed block I 403, baffle plate 404, guide rail I 405, slider I 406, described fixed block I 403 is bolted to connection with projection plate I 401, described baffle plate 404 is connected by bolt is fixing with fixed block I 403, it is right that described fixing seat 402 is set to two, described guide rail I 405 is set to two, every pair of fixing seat 402 coordinates installation with a guide rail I 405, two fixing seats 402 in every pair of fixing seat 402 are separately positioned on the two ends of every guide rail I 405, described slider I 406 is set to two, it is movably arranged on every guide rail I 405 by bearing respectively；This mechanism can be that whole mechanism adds a perspective plane so that it is can more clearly represent and change face method by building moving sets in space.
Double-slider endplay device 5 is as shown in Figure 6 and Figure 7, including support bar I 501, contiguous block 502, fixed block II 503, support bar II 504, block 505, support bar III 506, locating piece 507, slide block II 508, guide rail II 509, supporting plate 510, fixed block III 511, slideway 512, limited block 513, pull bar 514, projection plate II 515, this mechanism is connected supporting plate 510 as overall support with support bar I 501 by screw, support bar II 504 is carried out spacing with support bar I 501 by block 505, and recycling bolt-connection is fixed integrant support system.Guide rail II 509 uses bolt-connection to fix with supporting plate 510, and pull bar 514 is directly inserted in slideway 512, adds upper limit position block 513 at slideway 512 two ends, carries out spacing to pull bar 514, constitutes pull bar slideway mechanism.Guide rail II 509 directly with locating piece 507 tight fit connection, and use bolt-connection to be fixed on support bar III 506 locating piece 507, composition slide block guide rail mechanism.Pull bar 514 is L-type, and L-type minor face is connected by pin 516 with locating piece 507, and locating piece 507 then directly utilizes bolt and nut and is fixed on projection plate II 515.Projection plate II 515 is coupled by bolt and nut and a pair fixed block III 511.Slide block II 508 and fixed block II 503 screw attachment, and use pin 516 to couple with contiguous block 502 fixed block II 503.Use pin 516 to couple with contiguous block 502 fixed block III 511 again, just constitute double-slider endplay device.This mechanism can match with slide block guide rail mechanism by pulling pull bar 514, by the flip-flop movement that transform linear motion is projection plate II 515 of pull bar 514, and constructs secondary and changes the perspective plane in face.
As shown in Figure 8, including MCU master controller 701, infrared receiving terminal 702, motor 703, motor drives plate 704, worm screw 705, bearing block 706, worm gear 707, base shell 708 to base 7.Described infrared receiving terminal 702 is fixed on the outside of base shell 708, in order to receives the signal that remote control sends, and is connected with MCU701 by holding wire.During Infrared Remote-Control Sending signal, by command encoder output order code signal.After remote controller pushes button, circuit produces signal, through modulators modulate over the carrier signal, forms the high-frequency pulse string including function information, the output of specific foot amplify through transistor BG, promotes infrared light-emitting diode D to launch pulse-modulated signal.Received head device 702 by the infra-red remote control in the outside being fixed on base shell 708 and receive signal, and the infrared remote control signal that will receive, output function command signal after amplifying, solve mediation shaping, deliver to Micro-processor MCV 701 and be identified and process.Microprocessor, according to the signal received, exports corresponding pwm signal and drives plate 704 to motor, drives plate to drive motor 703 to operate.Motor 703 drives worm screw 705, worm gear 705 to be connected with the main shaft of rotating mechanism, selects suitable gear ratio, just can realize coming the angle change of automatic accurate control rotating mechanism with infrared remote control.
Nylon material is all selected in conjunction with fixed block described in Fig. 6, Fig. 7 II 503, contiguous block 502 and fixed block III 511 material.The effect using nylon is itself good springiness, and intensity is high, light weight, and wearability is high, with low cost, can effectively reduce the quality of the present invention.
Titanium alloy material is all selected in conjunction with base plate described in Fig. 1 601, top board 602 and support 603 material.Use titanium alloy can be effectively improved the intensity of the present invention, extend its service life, it is also possible to reduce its oeverall quality.
The operating process of the present invention can be divided into following 5 steps,
1, building space dotted line surface element, use spatial linkage, consisted of hinged vertical bar and horizon bar, wherein vertically bar can vertically rotate, and horizon bar can rotate around vertical bar, and any straight line in such space just can show.Simultaneously plus a hinged quarter butt on this space line, can rotate about, so can build space arbitrary plane.
2, build V surface element, use the fit system of straight optical axis and slide, manually direct for V face jacking is got up, and with block, it is carried out spacing.Use projector mechanism that space geometrical element is projected to plane.
3, build V ' surface element, the projector mechanism once changing face is rotated to corresponding angle, then drives pull bar so that it is move along a straight line along slideway, and then band movable slider is for linear motion along guide rail.Re-use double-slider endplay device, by the flip-flop movement that the transform linear motion of slideway is projection plane 90 °, construct reprojection's V ' plane.Use projector mechanism that space geometrical element is projected to plane, complete once to change face projection.
4. take out secondary and change face projection plate, be arranged on above the projection plate once changing face, it is ensured that it is vertical with the horizon bar in spatial linkage.(this operation can be implemented by laser pen) then carries out projecting and being marked with marking pen with laser pen, completes secondary and changes face projection.
5, finally projection paper is taken off, be well placed position, successively the point determined is attached, it is possible to draw the full mold of space line.
Claims (5)
1. change a face method teaching aid apparatus for demonstrating, it is characterized in that: include space surface construction mechanism (1), space
Line constructive mechanism (2), rotating mechanism (3), slide block guide rail mechanism (4), double-slider endplay device (5),
Space framework (6) and base (7), described space surface construction mechanism (1) and space line constructive mechanism (2)
It is arranged on the upper end of space framework (6)；Described rotating mechanism is vertically set on the inside of space framework (6)
Center；Described slide block guide rail mechanism (4) is arranged on the left end in space framework (6) outside；Described double
Slide block endplay device (5) is arranged on the inside of space framework (6)；Described base (7) is internal equipped with worm gear
Worm mechanism, worm screw is driven by motor, and worm gear is connected with the main shaft of rotating mechanism (3), to realize with infrared
Remote control carrys out the angle change of automatic accurate control rotating mechanism；
Described space surface construction mechanism (1) include show point I (101), long connecting rod (102), contiguous block (103),
Short connecting rod (104), pole I (105), bearing I (106), bearing (107), described long connecting rod (102)
With pole I (105) by bolted splice, described short connecting rod (104) be enclosed within long connecting rod (102)
Contiguous block (103) passes through bolted splice；Described pole I (105) is by bearing I (106) and bearing (107)
Connecting, pole I (105) is to be fastenedly connected with bearing I (106), bearing I (106) and bearing (107)
On hole be to be fastenedly connected；Described displaying point I (101) is set to three, is respectively arranged at long connecting rod (102)
Two ends and the movable end of short connecting rod (104)；
Described space line constructive mechanism (2) include show point II (201), stock (202), pole II (203),
Base (204), bearing II (205), described stock (202) passes through bolted splice with pole II (203),
Described pole II (203) is connected with base (204) by bearing II (205), pole II (203) and
Bearing II (205) tight fit, bearing II (205) is tight fit with the hole on base (204)；Described exhibition
Show and a little II (201) be set to two, be separately positioned on the two ends of stock (202)；
Described rotating mechanism (3) includes axle (301), thrust ball bearing (302), pad (303), circular cone
Roller bearing (304), nut (305), described pad (303) is arranged on taper roll bearing (304)
Turn with chien shih taper roll bearing (304) and thrust ball bearing (302) circumference of thrust ball bearing (302)
Move and be connected；Described axle (301) is fixedly connected on three-dimensional frame by nut (305) in the vertical direction
On the bottom surface of frame (6)；
Described slide block guide rail mechanism (4) include projection plate I (401), fixing seat (402), fixed block I (403),
Baffle plate (404), guide rail I (405), slider I (406), described fixed block I (403) and projection plate I
(401) being bolted to connection, described baffle plate (404) is fixed with fixed block I (403) by bolt
Connecting, it is two right that described fixing seat (402) is set to, and described guide rail I (405) is set to two, every pair
Fixing seat (402) coordinates installation with a guide rail I (405), and two in every pair of fixing seat (402) are solid
Reservation (402) is separately positioned on the two ends of every guide rail I (405), and described slider I (406) is set to
Two, it is flexibly connected with every guide rail I (405) by bearing respectively；
Described double-slider endplay device (5) includes support bar I (501), contiguous block (502), fixed block II
(503), support bar II (504), block (505), support bar III (506), locating piece (507), cunning
Block II (508), guide rail II (509), supporting plate (510), fixed block III (511), slideway (512), limit
Position block (513), pull bar (514), projection plate II (515), described supporting plate (510) is rectangle, passes through
Bolt is fixedly installed on the top of rotating mechanism (3), and described support bar I (501) is set to two, point
It is not bolted on the two ends being arranged on supporting plate (510), described support bar II (504) and support bar
III (506) is respectively set to two, and every support bar II (504) is respectively by block (505) and support
Bar I (501) is slidably connected, and two support bars III (506) are with two support bar II (504) head and the tail successively
It is bolted to connection, forms a rectangle bracing frame；It is two right that described locating piece (507) is set to,
Being respectively and fixedly installed on two bracing frames III (506), two guide rails II (509) pass through locating piece respectively
(507) fixing with bracing frame III (506) it is connected；Described slide block II (508) and fixed block II (503)
Connecting by screw is fixing, described fixed block II (503) is with contiguous block (502) by pin (516) even
Connecing, described fixed block III (511) is connected by pin (516) with contiguous block (502)；Described slideway (512)
Being bolted and be arranged on supporting plate (510), the head and end of slideway (512) is fixedly installed limited location
Block (513), pull bar (514) is L-type, and the minor face of L-type is fixing with projection plate II (515) to be connected, L-type
To insert slideway (512) internal on long limit, be flexibly connected with the inwall of slideway (512).
One the most according to claim 1 changes face method teaching aid apparatus for demonstrating, it is characterized in that: described vertical
Body framework (6) includes base plate (601), top board (602), support (603), described base plate (601) and
Top board (602) is regular hexagon structure, and described support (603) is set to the six roots of sensation, the two of support (603)
Individual end points is respectively and fixedly installed on orthohexagonal six summits.
One the most according to claim 1 changes face method teaching aid apparatus for demonstrating, it is characterized in that: described base
(7) include that MCU master controller (701), infrared receiving terminal (702), motor (703), motor drive plate
(704), worm screw (705), bearing block (706), worm gear (707), base shell (708), described red
Outer reception head (702) is fixed on the outside of base shell (708), to receive the signal that remote control sends, and electricity
Machine drives worm screw, and worm gear is connected with the main shaft of rotating mechanism.
One the most according to claim 1 and 2 changes face method teaching aid apparatus for demonstrating, it is characterized in that: described
Fixed block II (503), contiguous block (502) and fixed block III (511) material all select nylon material.
One the most according to claim 2 changes face method teaching aid apparatus for demonstrating, it is characterized in that: described base plate
(601), top board (602) and support (603) material all select titanium alloy material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410535653.XA CN104217642B (en) | 2014-10-11 | 2014-10-11 | One changes face method teaching aid apparatus for demonstrating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410535653.XA CN104217642B (en) | 2014-10-11 | 2014-10-11 | One changes face method teaching aid apparatus for demonstrating |
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| Publication Number | Publication Date |
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| CN104217642A CN104217642A (en) | 2014-12-17 |
| CN104217642B true CN104217642B (en) | 2016-08-17 |
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| CN201410535653.XA Expired - Fee Related CN104217642B (en) | 2014-10-11 | 2014-10-11 | One changes face method teaching aid apparatus for demonstrating |
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| CN108492638B (en) * | 2018-05-04 | 2023-05-09 | 江南大学 | Engineering drawing teaching device for intuitively demonstrating principle of face changing method |
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| KR101245842B1 (en) * | 2010-12-06 | 2013-03-20 | 주식회사 한양비이에스티교육 | Teaching Device For Bridge Education |
| RU110207U1 (en) * | 2011-06-16 | 2011-11-10 | Государственное образовательное учреждение высшего профессионального образования "Курский государственный университет" | EDUCATIONAL-DEMONSTRATION STAND FOR CONSTRUCTION OF AXONOMETRIC PROJECTIONS OF FIGURES IN A RECTANGULAR COORDINATE SYSTEM |
| CN102708732B (en) * | 2012-05-07 | 2014-02-19 | 山东科技大学 | Multifunctional three-side projection box and projection display method |
| CN203799529U (en) * | 2014-04-18 | 2014-08-27 | 南昌工程学院 | Teaching aid for general position straight line surface changing method |
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