CN106782017A - Disc cam demonstrator - Google Patents
Disc cam demonstrator Download PDFInfo
- Publication number
- CN106782017A CN106782017A CN201710047091.8A CN201710047091A CN106782017A CN 106782017 A CN106782017 A CN 106782017A CN 201710047091 A CN201710047091 A CN 201710047091A CN 106782017 A CN106782017 A CN 106782017A
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- push rod
- cam
- substrate
- fixed block
- fixed
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- 239000000758 substrate Substances 0.000 claims abstract description 32
- 239000000203 mixture Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 12
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
- G09B25/02—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of industrial processes; of machinery
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- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Physics & Mathematics (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Toys (AREA)
Abstract
A kind of disc cam demonstrator, including substrate（1）, installed in the part of front and back element three of substrate, mainly move horizontally component, vertical translation member, rotating member, horizontal and vertical mobile member and pinnacle push rod 28 installed in the front and back element of substrate）, roller tappet（29）, flat push rod（30）, drawing pen combination（31）, pushrod movement law curve template（32）, cam form（33）, pushrod movement law curve drawing paper（34）, cam contour drawing paper（35）.According to application target, there are different combinations.This disc cam demonstrator, the correlation that student can be helped to be better understood between cam profile and pushrod movement rule, suitable for the various push rod forms such as pinnacle, flat, roller, suitable for push rod to the heart, biasing occasion, cover most of contents of university's disc cam teaching, intuitively, can remember, help to cause students ' interest of study, improve classroom teaching efficiency.
Description
Technical field
The present invention relates to a kind of dish type for demonstrating the correlation between profile of plate cam and pushrod movement law curve
Cam demonstrator, is a kind of university's mechanical principle course instruments used for education.
Background technology
Cam and cam mechanism are in fields such as Machine Design, automated production equipments using widely.Cam is imparted knowledge to students
The most basic content of courses of undergraduate education mechanical speciality, is also knowledge that mechanical university student must grasp.At present, university's machine
Tool principle course is substantially multimedia teaching, most of teacher when cam mechanism is said, simply theoretically explanation or
Demonstrated on screen, seldom demonstrated with experimental facilities.Disc cam demonstrator of the invention, covers university's disc cam teaching
Most of contents, student can be helped to more fully understand the relation between cam profile and pushrod movement rule, improve
Classroom teaching efficiency, causes students ' interest of study.Through retrieval and market survey, there is not yet the document announcement of correlation and face in kind
City.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of disc cam demonstrator.
Solve above-mentioned technical problem and use following technical scheme：
This disc cam demonstrator, including substrate, the element three parts installed in substrate front side and the back side, it is characterized in that installing
There are disk, lasso, round nut, camshaft, right push rod, fastening screw, push rod fixed block, foreboard, preceding straight line in positive element
Axle sleeve, sliding bearing, pinnacle push rod or flat push rod or roller tappet on guide rail, left push rod, front and rear panel fixed block, substrate,
Drawing pen combination, pushrod movement law curve template or cam form, pushrod movement law curve drawing paper or cam contour are painted
Drawing；There are round guide fixed block, round guide, sliding block, back plate, handle, small axle, feed screw nut solid installed in the element of substrate back
Determine block, slide plate, leading screw combination, rear line slideway, tooth bar, cantilever bearings, gear；The bearing block at the leading screw combination two ends is with after
Line slideway is fixed on the back side of substrate, and handle is fixed on the leading screw shaft end of leading screw combination, the nut and leading screw spiral shell of leading screw combination
The sliding block of female fixed block, slide plate, tooth bar, small axle and rear line slideway is fixed together, and constitutes one and moves horizontally component,
Rotary handle, moves horizontally component and makees left and right rectilinear movement along rear line slideway；The round guide has two, by round guide
Fixed block is separately fixed at the back side both sides of substrate, and two sliding blocks of both sides are fixed in back plate, and back plate, front and rear panel are fixed
Block, foreboard, preceding line slideway, push rod fixed block, fastening screw, right push rod, two sliding blocks of both sides are fixed together structure
Into a vertical translation member, moved up and down along round guide；The left push rod is fixed on the sliding block of preceding line slideway, together
When left push rod elongated hole be enclosed within the free-end of small axle, left push rod with vertical translation member move up and down while, with water
Flat mobile member is moved left and right；The axle sleeve is enclosed within the circular hole of substrate, and the circular hole of the cylindrical and substrate of axle sleeve is matched somebody with somebody for interference
Close；Sliding bearing is enclosed within the endoporus of axle sleeve, and the endoporus of the cylindrical and axle sleeve of sliding bearing is interference fit；Cam sleeve is in cunning
In the endoporus of dynamic bearing；Disk, lasso, round nut, camshaft, gear are fixed together, and constitute a rotating member；Institute
Rack and pinion engagement is stated, cantilever bearings withstand on the back side of tooth bar；Pinnacle push rod, flat push rod, roller tappet and drawing pen
Combination, is optionally separately mounted to the free-end of right push rod and left push rod.
Described roller tappet is made up of roller stand, cantilever bearings；Drawing pen is combined by pen core fixture, spring, pen core
Frame, pen core composition.
The beneficial effects of the invention are as follows pushrod movement law curve can be drawn out by profile of plate cam, it is also possible to
Profile of plate cam is drawn out by pushrod movement law curve, and for the various push rod forms such as pinnacle, flat, roller and
Situations such as push rod is to the heart, biasing is all suitable for, and covers most of contents of university's disc cam teaching, helps to cause student to learn
Interest is practised, classroom teaching efficiency is improved.
Brief description of the drawings
Fig. 1 is the front view of the structural representation of disc cam demonstrator.
Fig. 2 is the side view of the structural representation of disc cam demonstrator.
Fig. 3 is the structural representation of disc cam demonstrator（Side-looking）The partial enlarged drawing of figure.
Fig. 4 is the rearview of the structural representation of disc cam demonstrator.
Fig. 5 is disc cam demonstrator pinnacle push rod schematic diagram.
Fig. 6 is the flat push rod schematic diagram of disc cam demonstrator.
Fig. 7 is disc cam demonstrator roller tappet schematic diagram.
Fig. 8 is disc cam demonstrator drawing pen combination diagram.
Fig. 9 is disc cam demonstrator pushrod movement law curve template schematic diagram.
Figure 10 is disc cam demonstrator push cam template schematic diagram.
Figure 11 is disc cam demonstrator pushrod movement law curve drawing paper schematic diagram.
Figure 12 is disc cam demonstrator cam contour drawing paper schematic diagram.
Figure 13 is disc cam demonstrator, is drawn to apex of the heart propulsion arm characteristics of motion curve synoptic diagram from cam contour.
Figure 14 is disc cam demonstrator, and flat pushrod movement law curve schematic diagram is drawn from cam contour.
Figure 15 is disc cam demonstrator, is drawn to heart roller pushrod movement law curve schematic diagram from cam contour.
Figure 16 is disc cam demonstrator, and eccentric roller pushrod movement law curve schematic diagram is drawn from cam contour.
Figure 17 is disc cam demonstrator, is drawn from pushrod movement law curve and apex of the heart propulsion arm cam contour is illustrated
Figure.
Figure 18 is disc cam demonstrator, and flat push cam outline drawing is drawn from pushrod movement law curve.
Specific embodiment：
The present invention is with reference to embodiment and is described in detail referring to the drawings, referring to accompanying drawing 1-12.
This disc cam demonstrator, including substrate 1, the element three parts installed in substrate front side and the back side, it is special
Levy and be mounted in positive element and have disk 2, lasso 3, round nut 4, camshaft 5, right push rod 6, fastening screw
7th, on push rod fixed block 8, foreboard 9, preceding line slideway 10, left push rod 11, front and rear panel fixed block 12, substrate
Axle sleeve 13, sliding bearing 14, pinnacle push rod 28 or flat push rod 29 or roller tappet 30, drawing pen combination 31
, pushrod movement law curve template 32 or cam form 33, pushrod movement law curve drawing paper 34 or cam contour
Drawing paper 35；There are round guide fixed block 15, round guide 16, sliding block 17, back plate 18 installed in the element of substrate back
, handle 19, small axle 20, feed screw nut fixed block 21, slide plate 22, leading screw combination 23, rear line slideway 24, tooth
Bar 25, cantilever bearings 26, gear 27；The bearing block and rear line slideway 24 that the leading screw combines 23 two ends are fixed
At the back side of substrate 1, handle 19 is fixed on the leading screw shaft end of leading screw combination 23, the nut and leading screw of leading screw combination 23
The sliding block of nut fixed block 21, slide plate 22, tooth bar 25, small axle 20 and rear line slideway 24 is fixedly connected on one
Rise, constitute one and move horizontally component, rotary handle 19 moves horizontally component and makees left and right straight line along rear line slideway 24
It is mobile；The round guide 16 has two, and the back side both sides of substrate 1, two are separately fixed at by round guide fixed block 15
Two sliding blocks 17 of side are fixed in back plate 18, and back plate 18, front and rear panel fixed block 12, foreboard 9, preceding straight line
Guide rail 10, push rod fixed block 8, fastening screw 7, two fixed-links of sliding block 17 of right push rod 6, both sides are together
A vertical translation member is constituted, is moved up and down along round guide 16；The left push rod 11 is fixed on preceding line slideway
On 10 sliding block, while the elongated hole of left push rod 11 is enclosed within the free-end of small axle 20, left push rod 11 is with vertically moving structure
While part moves up and down, moved left and right with component is moved horizontally；The axle sleeve 13 is enclosed within the circular hole of substrate 1
In, the circular hole of the cylindrical and substrate 1 of axle sleeve 13 is interference fit；Sliding bearing 14 is enclosed within the endoporus of axle sleeve 13,
The endoporus of the cylindrical and axle sleeve 13 of sliding bearing 14 is interference fit；Camshaft 5 is enclosed within the endoporus of sliding bearing 14
In；Disk 2, lasso 3, round nut 4, camshaft 5, gear 27 are fixed together, and constitute a rotation structure
Part；The tooth bar 25 is engaged with gear 27, and cantilever bearings 26 withstand on the back side of tooth bar 25；It is pinnacle push rod 28, flat
Bottom push rod 29, roller tappet 30 and drawing pen combination 31, is optionally separately mounted to right push rod 6 and left push rod
11 free-end.
Described roller tappet 30 is made up of roller stand 30a, cantilever bearings 30b；Drawing pen combination 31 is by pen
Core fixture 31a, spring 31b, pen core frame 31c, pen core 31d compositions.Handle 19, for left-handed person, user preferably pacifies
Mounted in the left end of lead screw shaft, otherwise installed in the right-hand member of lead screw shaft.
Using this demonstrator, below it is illustrated：
1. drawn to apex of the heart propulsion arm characteristics of motion curve according to cam contour：As shown in figure 13.Pushrod movement law curve is painted
Drawing 34 is arranged on the front lower right corner of substrate 1, drawing pen combination 31 is arranged on the lower end of left push rod 11, with fastening
Screw 7 is tightened, and rotates the height of handle 19 and the left push rod 11 of adjustment, nib is just referred in pushrod movement law curve
0 point of drawing paper 34；Cam form 33 is arranged on camshaft 5,0 ° of point of cam form 33 is just gone up most
Face, is then pushed down with lasso 3, then is tightened with round nut 4；By two spiral shells of the right push rod 6 on the right side of push rod fixed block 8
Pit is fixed on push rod fixed block 8, tightens fastening screw 7；Pinnacle push rod 28 is arranged on the lower end of right push rod 6,
Adjustment height, makes the tip of pinnacle push rod 28 just be overlapped with 0 ° of point of cam form 33；Handle 19 is rotated, makes drawing pen
31 0 ° to the 360 ° movements from pushrod movement law curve drawing paper 34 of combination, nib moves to 360 °, and drawing terminates.
2. flat pushrod movement law curve is drawn according to cam contour：As shown in figure 14.Pushrod movement law curve is painted
Drawing 34 is arranged on the front lower right corner of substrate 1, drawing pen combination 31 is arranged on the lower end of left push rod 11, with fastening
Screw 7 is tightened, and rotates the height of handle 19 and the left push rod 11 of adjustment, nib is just referred in pushrod movement law curve
0 point of drawing paper 34；Cam form 33 is arranged on camshaft 5,0 ° of point of cam form 33 is just gone up most
Face, is then pushed down with lasso 3, then is tightened with round nut 4；By two spiral shells of the right push rod 6 on the right side of push rod fixed block 8
Pit is fixed on push rod fixed block 8, tightens fastening screw 7；Flat push rod 29 is arranged on the lower end of right push rod 6, is adjusted
Whole height, makes the base of flat push rod 29 tangent with cam contour；Handle 19 is rotated, drawing pen is combined 31 from push rod
0 ° of characteristics of motion curves drawing paper 34 moves to 360 ° to 360 ° of movements, nib, and drawing terminates.
3. drawn to heart roller pushrod movement law curve according to cam contour：As shown in figure 15.Pushrod movement rule is bent
Line drawing paper 34 is arranged on the front lower right corner of substrate 1, and drawing pen combination 31 is arranged on the lower end of left push rod 11, uses
Fastening screw 7 is tightened, and rotates the height of handle 19 and the left push rod 11 of adjustment, nib is just referred in pushrod movement rule
0 point of curves drawing paper 34；Cam form 33 is arranged on camshaft 5,0 ° of point of cam form 33 is just existed
Topmost, then pushed down with lasso 3, then tightened with round nut 4；Right push rod 6 is used the two of the right side of push rod fixed block 8
Individual screwed hole is fixed on push rod fixed block 8, tightens fastening screw 7；Roller tappet 30 is arranged under right push rod 6
End, adjustment height, makes the roller of roller tappet 30 tangent with cam contour；Handle 19 is rotated, drawing pen is combined 31
From 0 ° to 360 ° movements of pushrod movement law curve drawing paper 34, nib moves to 360 °, and drawing terminates.
4. eccentric roller pushrod movement law curve is drawn according to cam contour：As shown in figure 16.Pushrod movement rule is bent
Line drawing paper 34 is arranged on the front lower right corner of substrate 1, and drawing pen combination 31 is arranged on the lower end of left push rod 11, uses
Fastening screw 7 is tightened；The height of handle 19 and the left push rod 11 of adjustment is rotated, nib is just referred in pushrod movement rule
0 point of curves drawing paper 34；Cam form 33 is arranged on camshaft 5,0 ° of point of cam form 33 is just existed
Topmost, then pushed down with lasso 3, then tightened with round nut 4；Right push rod 6 is used the two of the left side of push rod fixed block 8
Individual screwed hole is fixed on push rod fixed block 8, tightens fastening screw 7；Roller tappet 30 is arranged under right push rod 6
End, adjustment height, makes the roller of roller tappet 30 tangent with cam contour；Handle 19 is rotated, drawing pen is combined 31
From 0 ° to 360 ° movements of pushrod movement law curve drawing paper 34, nib moves to 360 °, and drawing terminates.
5. drawn to apex of the heart propulsion arm cam contour according to pushrod movement law curve：As shown in figure 17.Pushrod movement is advised
Rule template curve 32 is arranged on the front lower right corner of substrate 1, and pinnacle push rod 28 is arranged on the lower end of left push rod 11, uses
Fastening screw 7 is tightened；The height of handle 19 and the left push rod 11 of adjustment is rotated, makes the tip of pinnacle push rod 28 just
Refer to 0 point in pushrod movement law curve template 32；Cam contour drawing paper 35 is arranged on camshaft 5, is made convex
0 ° of point of wheel contour plot paper 35 just topmost, is then pushed down, then tightened with round nut 4 with lasso 3；The right side is pushed away
Bar 6 is fixed on push rod fixed block 8 with two screwed holes on the right side of push rod fixed block 8, tightens fastening screw 7；To draw
Pen combination 31 be arranged on right push rod 6 lower ends, adjustment height, nib just with 0 ° of point weight of cam contour drawing paper 35
Close；Handle 19 is rotated, cam contour drawing paper 35 from 0 ° to 360 ° rotations, nib is moved to 360 °, drawing terminates.
6. flat push cam profile is drawn according to pushrod movement law curve：As shown in figure 18.Pushrod movement rule is bent
Line template 32 is arranged on the front lower right corner of substrate 1, pinnacle push rod 28 is arranged on the lower end of left push rod 11, with fastening
Screw 7 is tightened；The height of handle 19 and the left push rod 11 of adjustment is rotated, the tip of pinnacle push rod 28 is just referred to
0 point of pushrod movement law curve template 32；Cam contour drawing paper 35 is arranged on camshaft 5, makes cam wheel
0 ° of point of wide drawing paper 35 just topmost, is then pushed down, then tightened with round nut 4 with lasso 3；By right push rod 6
It is fixed on push rod fixed block 8 with two screwed holes on the right side of push rod fixed block 8, tightens fastening screw 7；By flat push rod
29 lower ends for being arranged on right push rod 6, adjustment height, the base of flat push rod 29 just with cam contour drawing paper 35
80 circle it is tangent；Rotate handle 19, per revolution handle 19, along flat push rod on cam contour drawing paper 35
Straight line is drawn on 29 base, makes cam contour drawing paper 35 from 0 ° to 360 ° rotations, goes to 360 °, and drawing terminates.It is a plurality of
Lines enveloping goes out a closed curve, is both cam profile curve.
7. pushrod movement law curve when the same cam difference push rod of comparing is combined such as is intended to, can be by foregoing implementation method
1st, 2,3,4 pushrod movement law curve is drawn on same pushrod movement law curve drawing paper 34, can clearly be compared
Relatively go out the difference of different pushrod movement law curves.
Claims (2)
1. a kind of disc cam demonstrator, including substrate（1）, installed in substrate front side and back elements three parts, its feature
It is described have disk installed in positive element（2）, lasso（3）, round nut（4）, camshaft（5）, right push rod（6）, fastening spiral shell
Silk（7）, push rod fixed block（8）, foreboard（9）, preceding line slideway（10）, left push rod（11）, front and rear panel fixed block（12）, on substrate
Axle sleeve（13）, sliding bearing（14）, pinnacle push rod（28）Or flat push rod（29）Or roller tappet（30）Or drawing pen combination
（31）, pushrod movement law curve template（32）Or cam form（33）, pushrod movement law curve drawing paper（34）Or cam
Contour plot paper（35）；There is round guide fixed block installed in the element of substrate back（15）, round guide（16）, sliding block（17）, after
Plate（18）, handle（19）, small axle（20）, feed screw nut fixed block（21）, slide plate（22）, leading screw combination（23）, rear line slideway
（24）, tooth bar（25）, cantilever bearings（26）, gear（27）；The leading screw combination（23）The bearing block at two ends and rear line slideway
（24）It is fixed on substrate（1）The back side, handle（19）It is fixed on leading screw combination（23）Leading screw shaft end, leading screw combination（23）Silk
Thick stick nut and feed screw nut fixed block（21）, slide plate（22）, tooth bar（25）, small axle（20）And rear line slideway（24）Sliding block consolidate
Surely link together, constitute one and move horizontally component, rotary handle（19）, component is moved horizontally along rear line slideway（24）
Make left and right rectilinear movement；The round guide（16）There are two, by round guide fixed block（15）It is separately fixed at substrate（1）The back of the body
Face both sides, two sliding blocks of both sides（17）It is fixed on back plate（18）On, and back plate（18）, front and rear panel fixed block（12）, foreboard
（9）, preceding line slideway（10）, push rod fixed block（8）, fastening screw（7）, right push rod（6）, both sides two sliding blocks（17）It is fixed
One vertical translation member of the composition that links together, along round guide（16）Move up and down；The left push rod（11）It is fixed on
Preceding line slideway（10）Sliding block on, while left push rod（11）Elongated hole be enclosed within small axle（20）Free-end, left push rod（11）With
While vertical translation member and move up and down, moved left and right with component is moved horizontally；The axle sleeve（13）It is enclosed within base
Plate（1）Circular hole in, axle sleeve（13）Cylindrical and substrate（1）Circular hole be interference fit；Sliding bearing（14）It is enclosed within axle sleeve
（13）Endoporus in, sliding bearing（14）Cylindrical and axle sleeve（13）Endoporus be interference fit；Camshaft（5）It is enclosed within sliding axle
Hold（14）Endoporus in；Disk（2）, lasso（3）, round nut（4）, camshaft（5）, gear（27）It is fixed together, structure
Into a rotating member；The tooth bar（25）With gear（27）Engagement, cantilever bearings（26）Withstand on tooth bar（25）The back side；Point
Propulsion arm（28）, flat push rod（29）, roller tappet（30）And drawing pen combination（31）, optionally it is separately mounted to the right side and pushes away
Bar（6）With left push rod（11）Free-end.
2. disc cam demonstrator as claimed in claim 1, it is characterized in that described roller tappet（30）By roller stand
（30a）, cantilever bearings（30b）Composition；Drawing pen is combined（31）By pen core fixture（31a）, spring（31b）, pen core frame
（31c）, pen core（31d）Composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710047091.8A CN106782017B (en) | 2017-01-22 | 2017-01-22 | Disc cam demonstrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710047091.8A CN106782017B (en) | 2017-01-22 | 2017-01-22 | Disc cam demonstrator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106782017A true CN106782017A (en) | 2017-05-31 |
| CN106782017B CN106782017B (en) | 2019-04-19 |
Family
ID=58943973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710047091.8A Expired - Fee Related CN106782017B (en) | 2017-01-22 | 2017-01-22 | Disc cam demonstrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106782017B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108735075A (en) * | 2018-06-29 | 2018-11-02 | 德清创能电子科技有限公司 | A kind of science popularization teaching drawing robot |
| CN108922360A (en) * | 2018-06-29 | 2018-11-30 | 德清创能电子科技有限公司 | The science popularization teaching movable arm mechanism of drawing robot |
| CN109814320A (en) * | 2019-03-07 | 2019-05-28 | 北京空间机电研究所 | A kind of focus adjusting mechanism based on disc cam |
| CN111627300A (en) * | 2020-05-21 | 2020-09-04 | 河海大学常州校区 | Lisa looks like presentation device of picture formation principle |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108735075A (en) * | 2018-06-29 | 2018-11-02 | 德清创能电子科技有限公司 | A kind of science popularization teaching drawing robot |
| CN108922360A (en) * | 2018-06-29 | 2018-11-30 | 德清创能电子科技有限公司 | The science popularization teaching movable arm mechanism of drawing robot |
| CN109814320A (en) * | 2019-03-07 | 2019-05-28 | 北京空间机电研究所 | A kind of focus adjusting mechanism based on disc cam |
| CN109814320B (en) * | 2019-03-07 | 2021-02-05 | 北京空间机电研究所 | Focusing mechanism based on disc cam |
| CN111627300A (en) * | 2020-05-21 | 2020-09-04 | 河海大学常州校区 | Lisa looks like presentation device of picture formation principle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106782017B (en) | 2019-04-19 |
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