CN112509436A - Tide demonstration instrument - Google Patents

Tide demonstration instrument Download PDF

Info

Publication number
CN112509436A
CN112509436A CN202011491358.0A CN202011491358A CN112509436A CN 112509436 A CN112509436 A CN 112509436A CN 202011491358 A CN202011491358 A CN 202011491358A CN 112509436 A CN112509436 A CN 112509436A
Authority
CN
China
Prior art keywords
demonstration
pressing block
transmission device
fixing plate
water pressing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202011491358.0A
Other languages
Chinese (zh)
Other versions
CN112509436B (en
Inventor
孟庆朋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SUZHOU YULONG SCIENTIFIC EDUCATION EQUIPMENT CO LTD
Original Assignee
SUZHOU YULONG SCIENTIFIC EDUCATION EQUIPMENT CO LTD
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SUZHOU YULONG SCIENTIFIC EDUCATION EQUIPMENT CO LTD filed Critical SUZHOU YULONG SCIENTIFIC EDUCATION EQUIPMENT CO LTD
Priority to CN202011491358.0A priority Critical patent/CN112509436B/en
Publication of CN112509436A publication Critical patent/CN112509436A/en
Application granted granted Critical
Publication of CN112509436B publication Critical patent/CN112509436B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B23/00Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/30Assessment of water resources

Landscapes

  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Algebra (AREA)
  • Pure & Applied Mathematics (AREA)
  • Educational Administration (AREA)
  • Computational Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Educational Technology (AREA)
  • Theoretical Computer Science (AREA)
  • Electromechanical Clocks (AREA)

Abstract

The invention discloses a tide demonstration instrument which comprises a box body, a transparent observation area, an operation control area, a clock disc, a lunar clock disc, a demonstration control system, a water tank, a water pressing block, a transmission device, a display area and a driver, wherein the transparent observation area is arranged on the box body; a transparent observation area, an operation control area, a clock dial, a lunar clock dial and a display area are arranged right in front of the box body; the demonstration control system is arranged inside the box body; the operation control area and the display area are connected with a demonstration control system; the water tank is arranged in the box body; a transmission device is arranged in the water tank; the transmission device is provided with a water pressing block; the driver drives the transmission device to drive the water pressing block to reciprocate up and down; the driver is connected with the demonstration control system. The relation between the tide phenomenon and the period is displayed in a simulation form, so that the understanding of theoretical knowledge and the mastering of the formation principle are facilitated; through the difference is the control button, can demonstrate multiple morning and evening tides form, it is vivid interesting.

Description

Tide demonstration instrument
Technical Field
The invention relates to a tide demonstration instrument for teaching or popular science display.
Background
The tide is a phenomenon of periodic fluctuation of seawater formed under the action of gravity of moon and sun. During the day, tide is called, and at night, tide is called, which is called as tide. Typically, fluctuations occur twice daily, and also fluctuations occur once daily. The sea wave is traced upward along the river, and the tide is generated at the downstream of the river. The summer calendar is based on the change of the lunar phase, has a great effect of reflecting tides, the tide phenomenon plays a leading role in the brightness of the moon, and the summer calendar based on the change of the lunar phase is an ancient guide for guiding maritime activities. The moon attracts the seawater of the earth, each point on the surface of the earth has different distances from the moon, the attraction force is large at the position opposite to the moon, and the seawater expands outwards; the seawater at the place back to the moon is less attracted by gravity and the centrifugal force is increased, and the seawater expands to the place back to the moon under the action of the centrifugal force, so that the flood tide can also appear.
During teaching or science popularization of tidal phenomena, the tidal phenomena can be intuitively observed only through theoretical explanation and hardly intuitively sensed by the change of the periodicity and the size of the tide, and the relevant theoretical knowledge can be accepted and understood more easily through visual demonstration.
Disclosure of Invention
The invention aims to: provides a tidal demonstration instrument for vividly and vividly displaying tidal phenomena.
The technical scheme of the invention is as follows: a tide demonstration instrument comprises a box body, a transparent observation area, an operation control area, a clock disc, a lunar clock disc, a demonstration control system, a water tank, a water pressing block, a transmission device, a display area and a driver; a transparent observation area, an operation control area, a clock dial, a lunar clock dial and a display area are arranged right in front of the box body; the demonstration control system is arranged inside the box body; the operation control area and the display area are connected with a demonstration control system; the water tank is arranged in the box body; a transmission device is arranged in the water tank; the transmission device is provided with a water pressing block; the driver drives the transmission device to drive the water pressing block to reciprocate up and down; the driver is connected with the demonstration control system.
Preferably, the transmission device comprises a first transmission device and a second transmission device.
Preferably, the water pressing block comprises a small water pressing block and a large water pressing block; the small water pressing block is connected with the first transmission device; the clock dial is a 24-hour system, and a clock pointer of the clock dial rotates along with the lifting of the small water pressing block; when the clock pointer rotates to 12 hours or 0 hours, the small water pressing block is completely sunk into water, the liquid level water level can be observed to rise in the transparent observation area, when the clock pointer rotates to 6 hours or 18 hours, the small water pressing block is lifted away from the liquid level, and the liquid level water level can be observed to fall in the transparent observation area; the large water pressing block is connected with a second transmission device; the lunar clock hands of the lunar clock disk rotate for a circle, the high-pressure water block rises and falls twice, and when the high-pressure water block on the back of the lunar clock disk is completely immersed in water, the lunar clock hands are dialed to the first one or fifteen; when the big water pressing block on the back of the dial of the lunar phase clock is completely lifted off the water surface, the lunar phase pointer is adjusted to be seventy or twenty-two, and the lunar phase clock pointer can be manually adjusted to make the lunar phase and the rise and fall time of the sun and the moon correspond.
Preferably, the operation control area is a button operation control area and comprises a solar tide demonstration button, a lunar tide demonstration button, a climax demonstration button and a climax demonstration button.
Preferably, the display area displays information, images and videos; besides relevant information and images can be displayed, when solar tides, lunar tides, climax and tides are demonstrated, the display screen can synchronously play corresponding principle explanation videos.
Preferably, the demonstration control system is an embedded control system and comprises a controller and a rotary encoder; the signal can be transmitted for rotary encoder when operation control area starts demonstration button, and rotary encoder can transmit signal for demonstration control system, and demonstration control system control driver starts to drive transmission transports the pressurized-water piece to the relevant position.
Preferably, the transmission device is a spiral lifting device and comprises a coupler, an upper fixing plate, a bearing seat, a screw rod, a bearing seat and a lower fixing plate; the lower fixing plate is fixed in the water tank; the upper fixing plate and the lower fixing plate are arranged in parallel; bearing seats are arranged on the upper fixing plate and the lower fixing plate; a screw rod is arranged between the upper fixing plate and the lower fixing plate; the upper end and the lower end of the screw rod are connected with a bearing seat; the screw rod is provided with a water pressing block; the driver drives the screw rod to rotate through the coupler.
Preferably, the upper fixing plate and the lower fixing plate are provided with guide shafts; the guide shaft penetrates through the water pressing block.
Preferably, in the water tank, a background plate is arranged at the transparent observation area, and the content of the background plate area can be observed through the transparent observation area right in front of the water tank.
The invention has the advantages that:
1. the relation between the tide phenomenon and the period is displayed in a simulation form, so that the understanding of theoretical knowledge and the mastering of the formation principle are facilitated;
2. through the difference is the control button, can demonstrate multiple morning and evening tides form, it is vivid interesting.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a schematic view of a tidal demonstration instrument according to the present disclosure;
FIG. 2 is a left side view schematic diagram of a tidal demonstration instrument according to the present disclosure;
FIG. 3 is a schematic view of the internal structure of a tidal demonstration instrument according to the present disclosure;
FIG. 4 is a schematic structural view of a transmission device of a tidal demonstration instrument;
wherein: 1. a box body; 2. a transparent viewing area; 3. an operation control area; 4. a clock dial; 5. a lunar clock dial; 6. a demonstration control system; 7. a water tank; 8. pressing water blocks; 9. a transmission device; 10. a display area; 11. a driver; 21. a background plate; 41. a clock pointer; 51. a lunar phase pointer; 91. a coupling; 92. an upper fixing plate; 93. a bearing seat; 94. a screw rod; 95. a lower fixing plate; 96. and a guide shaft.
Detailed Description
Example (b):
as shown in fig. 1-4, the tide demonstration instrument comprises a box body 1, a transparent observation area 2, an operation control area 3, a clock dial 4, a lunar clock dial 5, a demonstration control system 6, a water tank 7, a water pressing block 8, a transmission device 9, a display area 10 and a driver 11; a transparent observation area 2, an operation control area 3, a clock dial 4, a lunar clock dial 5 and a display area 10 are arranged right in front of the box body 1; the demonstration control system 6 is arranged inside the box body 1; the operation control area 3 and the display area 10 are connected with the demonstration control system 6; the water tank 7 is arranged in the box body 1; a transmission device 9 is arranged in the water tank 7; the transmission device 9 is provided with a water pressing block 8; the driver 9 drives the transmission device 9 to drive the water pressing block 8 to reciprocate up and down; the driver 9 is connected with the demonstration control system 6; a background plate 21 is arranged at the transparent observation area in the water tank, and the content of the background plate 21 area can be observed through the transparent observation area 2 right in front of the water tank; the controller 11 is a step motor.
The transmission device 9 is a spiral lifting device and comprises a coupler 91, an upper fixing plate 92, a bearing seat 93, a screw rod 94 and a lower fixing plate 95; the lower fixing plate 95 is fixed in the water tank 7; the upper fixing plate 92 and the lower fixing plate 95 are arranged in parallel; bearing seats 93 are arranged on the upper fixing plate 92 and the lower fixing plate 95; a screw rod 94 is arranged between the upper fixing plate 92 and the lower fixing plate 95; the upper end and the lower end of the screw rod 94 are connected with a bearing seat 93; the screw rod 94 is provided with a water pressing block 8; the driver 9 drives the screw rod 94 to rotate through the coupler 91; the upper fixing plate 92 and the lower fixing plate 95 are provided with guide shafts 96; the guide shaft 96 penetrates through the water pressing block 8; a bearing is arranged in the bearing seat 93; the transmission device 9 comprises a first transmission device and a second transmission device; the water pressing block 8 comprises a small water pressing block 81 and a large water pressing block 82; the small water pressing block 81 is connected with a first transmission device; the clock dial is a 24-hour system, and the rotation of the clock hands 41 of the clock dial 4 is linked with the lifting of the small water pressing block 81 on the back surface of the clock dial through the embedded control system 6; when the clock pointer 41 rotates to 12 hours or 0 hours, the small water pressing block 81 is completely sunk into the water, the liquid level rising can be observed in the transparent observation area, when the clock pointer rotates to 6 hours or 18 hours, the small water pressing block is lifted away from the liquid level, and the liquid level falling can be observed in the transparent observation area; the large water pressing block is connected with a second transmission device; the lunar phase pointer 51 of the lunar phase clock dial 5 can be manually adjusted, and the water pressing block on the back of the lunar phase clock dial 5 is driven by the second transmission device until the lunar phase pointer is completely immersed in water; the lunar clock hand 51 of the lunar clock disk 5 rotates for a circle, the high-pressure water block rises and falls twice, and when the high-pressure water block 82 on the back of the lunar clock disk 5 is completely immersed in water, the lunar clock hand is dialed to the first one or fifteen; when the large water pressing block 82 on the back of the lunar clock disk 5 is completely lifted off the water surface, the lunar clock hands are dialed to be seventy or twenty-two, and the lunar clock hands are manually dialed, so that the lunar phases correspond to the rise and fall time of the sunset and the moon.
The operation control area 3 is a button operation control area and comprises a solar tide demonstration button, a lunar tide demonstration button, a climax demonstration button and a climax demonstration button; the display area 10 is a display screen and displays information, images and videos; besides displaying related information and images, when demonstrating solar tides, lunar tides, climax and tides, the display screen can synchronously play corresponding principle explanation videos; the demonstration control system 6 is an embedded control system and comprises a controller and a rotary encoder; when the demonstration button is started in the operation control area, a signal can be transmitted to the rotary encoder, the rotary encoder can transmit a signal to the controller, and the controller controls the driver 11 to be started, so that the driving transmission device 9 can convey the water pressing block to a corresponding position.
The clock disc 4 (also called as a solar disc) and the lunar clock disc 5 (also called as a moon disc) rotate to drive the water pressing block 8 in the box body 1 to lift, so as to cause the liquid level of the water tank 7 to lift and demonstrate tide phenomena generated by the tidal force action of the sun and the moon.
1. The solar tide demonstration button is started, the clock pointer 41 rotates when 12 hours or 0 hours, the demonstration control system 6 controls the small water pressing block 81 on the transmission back of the transmission device to be completely immersed into water through the progress motor, the liquid level of the transparent observation area 2 rises, when the clock pointer 41 rotates to 6 hours or 18 hours, the spiral lifting mechanism drives the small water pressing block 81 on the transmission back to lift away from the liquid level, the liquid level of the transparent observation area drops, and meanwhile, the display screen plays an animation video of the solar tide forming principle.
2. Starting a lunar tide demonstration button, controlling a second transmission device on the back of a lunar tide disk 5 by a demonstration control system 6 through a stepping motor to drive a large water pressing block 82 to be completely immersed in water, enabling the liquid level to rise, and observing lunar tide through a transparent display area 2; the spiral lifting mechanism on the back of the dial of the lunar phase clock drives the high-pressure water block 82 to lift off the liquid level, the liquid level descends, the lunar phase clock pointer 51 rotates for a circle, the high-pressure water block on the back lifts twice, the high-pressure water block is completely immersed in water in the first one and the fifteen hours respectively, the high-pressure water block is completely lifted out of the water level in the first seven and the twenty-two hours, the lunar phase clock pointer 52 is manually dialed, and meanwhile, the display screen plays an animation video of the lunar tide formation principle.
3. The big tide demonstration button is started, the demonstration control system 6 controls the first transmission device and the second transmission device to drive the big water pressing block 82 and the small water pressing block 81 to be immersed in water at the same time through the stepping motor, the first and the fifteenth days are demonstrated, the big tide phenomenon caused by overlapping of the sun tide and the moon tide is approximately on a straight line because the sun, the moon and the earth, and meanwhile, the display screen plays an animation video of the big tide forming principle.
4. The tidal wave demonstration button is started, the demonstration control system 6 controls the first transmission device and the second transmission device to simultaneously transmit the large water pressing block and the small water pressing block to be partially immersed in water through the stepping motor, demonstration is performed on the basis that the earth, the moon and the sun form right angles, the solar tide counteracts the tidal wave phenomenon of a part of tide effects of the lunar tide, and meanwhile, the display screen plays an animation video of the tidal wave forming principle.
The multifunctional tide demonstration instrument can demonstrate the phenomenon of big tide and small tide generated by the action of the tidal attraction force and the resultant force of the sun and the moon at any time, understand the change rule of the tide and master the principle of the tide formation. Is a good helper for schools to develop marine science teaching and science popularization venues and tide observation scenic spots to show tidal changes.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed herein be covered by the appended claims.

Claims (9)

1. A tidal demonstration instrument is characterized in that: the device comprises a box body, a transparent observation area, an operation control area, a clock disc, a lunar clock disc, a demonstration control system, a water tank, a water pressing block, a transmission device, a display area and a driver; a transparent observation area, an operation control area, a clock dial, a lunar clock dial and a display area are arranged right in front of the box body; the demonstration control system is arranged inside the box body; the operation control area and the display area are connected with a demonstration control system; the water tank is arranged in the box body; a transmission device is arranged in the water tank; the transmission device is provided with a water pressing block; the driver drives the transmission device to drive the water pressing block to reciprocate up and down; the driver is connected with the demonstration control system.
2. A tidal demonstration instrument according to claim 1 wherein: the transmission device comprises a first transmission device and a second transmission device.
3. A tidal demonstration instrument according to claim 2 wherein: the water pressing block comprises a small water pressing block and a large water pressing block; the small water pressing block is connected with the first transmission device; the clock hands of the clock dial rotate along with the lifting of the small water pressing block; the large water pressing block is connected with a second transmission device; the lunar clock hands of the lunar clock disk rotate for a circle, and the connected high-pressure water block goes up and down twice.
4. A tidal demonstration instrument according to claim 1 wherein: the operation control area is a button operation control area and comprises a solar tide demonstration button, a lunar tide demonstration button, a climax demonstration button and a climax demonstration button.
5. A tidal demonstration instrument according to claim 1 wherein: the display area displays information, images and videos.
6. A tidal demonstration instrument according to claim 1 wherein: the demonstration control system is an embedded control system.
7. A tidal demonstration instrument according to claim 1 wherein: the transmission device is a spiral lifting device and comprises a coupler, an upper fixing plate, a bearing seat, a screw rod, a bearing seat and a lower fixing plate; the lower fixing plate is fixed in the water tank; the upper fixing plate and the lower fixing plate are arranged in parallel; bearing seats are arranged on the upper fixing plate and the lower fixing plate; a screw rod is arranged between the upper fixing plate and the lower fixing plate; the upper end and the lower end of the screw rod are connected with a bearing seat; the screw rod is provided with a water pressing block; the driver drives the screw rod to rotate through the coupler.
8. A tidal demonstration instrument according to claim 1 wherein: the upper fixing plate and the lower fixing plate are provided with guide shafts; the guide shaft penetrates through the water pressing block.
9. A tidal demonstration instrument according to claim 1 wherein: and a background plate is arranged in the water tank and at the transparent observation area.
CN202011491358.0A 2020-12-17 2020-12-17 Tide demonstration instrument Active CN112509436B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011491358.0A CN112509436B (en) 2020-12-17 2020-12-17 Tide demonstration instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011491358.0A CN112509436B (en) 2020-12-17 2020-12-17 Tide demonstration instrument

Publications (2)

Publication Number Publication Date
CN112509436A true CN112509436A (en) 2021-03-16
CN112509436B CN112509436B (en) 2022-09-09

Family

ID=74972966

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011491358.0A Active CN112509436B (en) 2020-12-17 2020-12-17 Tide demonstration instrument

Country Status (1)

Country Link
CN (1) CN112509436B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114019783A (en) * 2021-08-06 2022-02-08 贵州宝智达网络科技有限公司 Real-time automatic timing equipment based on 5G network

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101206809A (en) * 2006-12-21 2008-06-25 上海市嘉定区第二中学 Device for simulating the effect of moon to tide
CN204463690U (en) * 2015-02-09 2015-07-08 郑佳欣 A kind of tide origin cause of formation demonstrator
CN205582359U (en) * 2016-02-23 2016-09-14 山东鄄城致远科教仪器有限公司 Day ground month three globes
CN108939583A (en) * 2018-09-08 2018-12-07 马同金 A kind of toy that can demonstrate the tide is flowing and ebbing
CN208869992U (en) * 2018-08-23 2019-05-17 大连海洋大学 A kind of water tank of analog tidal flat fluctuation tide environment
CN209625609U (en) * 2018-12-13 2019-11-12 厦门大学附属科技中学(厦门市科技中学) Tide real time demonstration device
CN210110157U (en) * 2019-04-02 2020-02-21 大连海洋大学 Experimental device for simulating tidal process
CN111583775A (en) * 2020-06-02 2020-08-25 黎少勇 Sun, earth and moon model walking instrument

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101206809A (en) * 2006-12-21 2008-06-25 上海市嘉定区第二中学 Device for simulating the effect of moon to tide
CN204463690U (en) * 2015-02-09 2015-07-08 郑佳欣 A kind of tide origin cause of formation demonstrator
CN205582359U (en) * 2016-02-23 2016-09-14 山东鄄城致远科教仪器有限公司 Day ground month three globes
CN208869992U (en) * 2018-08-23 2019-05-17 大连海洋大学 A kind of water tank of analog tidal flat fluctuation tide environment
CN108939583A (en) * 2018-09-08 2018-12-07 马同金 A kind of toy that can demonstrate the tide is flowing and ebbing
CN209625609U (en) * 2018-12-13 2019-11-12 厦门大学附属科技中学(厦门市科技中学) Tide real time demonstration device
CN210110157U (en) * 2019-04-02 2020-02-21 大连海洋大学 Experimental device for simulating tidal process
CN111583775A (en) * 2020-06-02 2020-08-25 黎少勇 Sun, earth and moon model walking instrument

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114019783A (en) * 2021-08-06 2022-02-08 贵州宝智达网络科技有限公司 Real-time automatic timing equipment based on 5G network

Also Published As

Publication number Publication date
CN112509436B (en) 2022-09-09

Similar Documents

Publication Publication Date Title
CN112509436B (en) Tide demonstration instrument
CN204463690U (en) A kind of tide origin cause of formation demonstrator
CN203503236U (en) Sun-moon-earth model for teaching
Lewis Theoretical hydraulics, automata, and water clocks
CN208834632U (en) Day a kind of ground moon three ball running instruments
CN213935593U (en) Multi-functional show fence in university student mental health campus
CN211928899U (en) Clock and watch science popularization presentation device
CN204990978U (en) Accurate little gearshift
CN203941654U (en) Hydrodynamic lubrication demonstration instrument
CN2904172Y (en) Demonstrator for basic optics
CN203149995U (en) Teaching demonstrator for rotation and revolution of earth
CN2724126Y (en) Electronic celestial globe
CN101424955A (en) Moon visible time forenotice instrument
CN101727064B (en) Quartz clock with tide movement
CN211264079U (en) Astronomical clock for displaying sun, moon and star
CN220855939U (en) Multifunctional globe for geography teaching
CN201527739U (en) Sun-earth-moon operation demonstrator
CN209360235U (en) A kind of deep-sea exploitation display platform
CN209199465U (en) A kind of wall-mounted dynamic map
CN221766245U (en) Solar vision movement demonstration ball
CN2777681Y (en) Automatic sun, moon and earth apparatus
CN203931323U (en) Multifunctional fluid dynamic pressure lubrication demonstration instrument
CN203931322U (en) Fluid dynamic pressure lubrication demonstration instrument
CN209625612U (en) A kind of Northern Hemisphere apparent motion of the sun demonstrator
CN219085581U (en) Moon phase cause demonstration instrument

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant