CN108922342A - A kind of buoyancy teaching demonstration - Google Patents
A kind of buoyancy teaching demonstration Download PDFInfo
- Publication number
- CN108922342A CN108922342A CN201810792075.6A CN201810792075A CN108922342A CN 108922342 A CN108922342 A CN 108922342A CN 201810792075 A CN201810792075 A CN 201810792075A CN 108922342 A CN108922342 A CN 108922342A
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- sliding slot
- fixedly installed
- turntable
- forcing pipe
- closed container
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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
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/08—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics
- G09B23/12—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics of liquids or gases
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Algebra (AREA)
- Pure & Applied Mathematics (AREA)
- Mathematical Physics (AREA)
- Computational Mathematics (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- Theoretical Computer Science (AREA)
- Pressure Vessels And Lids Thereof (AREA)
- Instructional Devices (AREA)
Abstract
The invention discloses a kind of buoyancy teaching demonstrations, including pedestal, the top two sides of the pedestal are fixedly installed with closed container and forcing pipe respectively, the top of forcing pipe is equipped with sliding slot, conduit is connected on forcing pipe, one end of conduit extends to forcing pipe, the other end of conduit extends in closed container, turntable is rotatably equipped at the top of forcing pipe, the bottom of turntable is fixedly installed with screw rod, thread bush is equipped with slide plate on screw rod, the two sides of the bottom of slide plate are fixedly installed with bracket, the bottom end of two brackets is fixedly installed with the same piston plate, slide plate and piston plate are slidably mounted in sliding slot, multiple grooves are offered at the top of forcing pipe, slide bar is slidably fitted in groove.The present invention is mobile by rotation driven by rotary disc piston plate, the pressure value of air in closed container can be adjusted when piston plate moves up and down in sliding slot, and be capable of fixing the position of turntable, and then turntable is avoided accidentally to be touched and pressure in closed container is caused to change.
Description
Technical field
The present invention relates to technical field of teaching instruments, specially a kind of buoyancy teaching demonstration.
Background technique
Middle School Physics generally take the mode of preaching to impart knowledge to one's students, student can only the teaching practice of buoyancy
Passively receive to spoon-feed, theory does not contact reality, and teaching efficiency is poor.There are also the demonstration of buoyancy dresses in the prior art
The phenomenon that setting, can only demonstrating merely the relationship of gravity and buoyancy, and demonstrate out is more stiff.Through retrieving, application No. is
201310652561.5 patent document disclose a kind of buoyancy demonstration instrument for teaching.The demonstrator includes a transparent closed appearance
Device, closed container are provided with liquid, there is one section of gap between the liquid level of liquid and the top of closed container, gap by conduit with
Needle tubing connection has a column shape container that liquid is housed in closed container, the liquid level in the top and column shape container of column shape container it
Between also have one section of gap, the liquid of tubule connection closed container and the liquid of column shape container are arranged at the bottom of column shape container.The demonstration
Instrument intuitively can not only enjoyably demonstrate the relationship of gravity and buoyancy, moreover it is possible to have to the perfect gas equation of state and intuitively illustrate.
But the demonstrator inconvenience in design adjusts the pressure in column shape container, and pressure needs after adjusting in column shape container
The position for wanting the fixed needle tubing inner piston of sustained manual, could keep column container inner pressure in this way, operate more troublesome.
Summary of the invention
In view of the above problems, can effectively be solved in background technique the present invention provides a kind of buoyancy teaching demonstration
Aiming at the problem that pressure inconvenience in column shape container is adjusted, pressure its number pressure can be fixed after adjusting properly in column shape container
Value operates more convenient.
To achieve the above object, the present invention provides the following technical solutions：
The top two sides of a kind of buoyancy teaching demonstration, including pedestal, the pedestal are fixedly installed with closed appearance respectively
Device and forcing pipe, the top of forcing pipe are equipped with sliding slot, are connected with conduit on forcing pipe, one end of conduit extends to forcing pipe, leads
The other end of pipe extends in closed container, and turntable is rotatably equipped at the top of the forcing pipe, and the bottom of turntable is fixedly mounted
There is screw rod, thread bush is equipped with slide plate on screw rod, and the two sides of the bottom of slide plate are fixedly installed with bracket, and the bottom end of two brackets is fixed
The same piston plate is installed, slide plate and piston plate are slidably mounted in sliding slot；
Multiple grooves are offered at the top of forcing pipe, slide bar is slidably fitted in groove, and the bottom of turntable offers annular
Slot, the top of slide bar, which extends in annular groove, is fixedly installed with the first tapered rod, and installation is offered in the top inner wall of annular groove
Hole, mounting hole is interior to be equipped with the shaft being vertically arranged, and the outside sliding sleeve of the shaft is equipped with positioning ring, and the outside of positioning ring is fixed
It is mounted on the side wall of mounting hole, the bottom end of shaft is fixedly installed with the second tapered rod, the outside of second tapered rod and more
The outside sliding contact of first tapered rod in a first tapered rod, the top of the shaft extends to the top of turntable simultaneously
It is fixedly installed with handle, the slide bar is fixedly installed with rubber column close to the side of sliding slot, and the rubber column is located in annular groove,
Locating slot compatible with rubber column, side inner wall of the slide bar close to sliding slot are offered in the inside side walls of the annular groove
On be welded with spring, side inner wall of the spring close to one end of sliding slot with corresponding groove close to sliding slot mutually welds.
As a preferred technical solution of the present invention, gag lever post, the cunning are fixedly installed on the side wall of the groove
Bar is slidably located on corresponding gag lever post, and the spring slide is set on corresponding gag lever post.
As a preferred technical solution of the present invention, sealing ring is fixedly installed on the outside of the piston plate, it is described close
The outside of seal and the side walls of sliding slot are tightly connected.
As a preferred technical solution of the present invention, fixing sleeve is equipped with bearing, the outer ring of the bearing on the screw rod
On be fixedly installed with mounting rod, the mounting rod is fixedly mounted on the side wall of sliding slot.
As a preferred technical solution of the present invention, threaded hole, the screw rod and spiral shell are offered at the top of the slide plate
Pit is threadedly coupled.
As a preferred technical solution of the present invention, the forcing pipe is fixedly installed with pressure far from the side of closed container
Power table, and pressure gauge is connected with sliding slot.
As a preferred technical solution of the present invention, it is placed with column shape container in the closed container, on the conduit
Fixing sleeve is equipped with rubber stopper, and the rubber stopper is movably arranged on column shape container.
As a preferred technical solution of the present invention, the cross section of the slide plate and the cross section of sliding slot are rectangle knot
Structure.
Compared with prior art, the beneficial effects of the invention are as follows：
Buoyancy teaching demonstration of the invention by pedestal, closed container, forcing pipe, sliding slot, conduit, turntable, screw rod,
Slide plate, bracket, piston plate, mounting hole, shaft, handle, positioning ring, rubber stopper and bearing match, and shake handle, handle passes through
Shaft and positioning ring drive turntable rotation, the rotation of driven by rotary disc screw rod, and screw rod drives slide plate to slide in sliding slot by threaded hole,
Slide plate is slided in sliding slot by supporting band piston plate, can be adjusted in closed container when piston plate moves up and down in sliding slot
Pressure, and the pressure size in closed container can be gone out by gauge measurement；
Pass through groove, slide bar, annular groove, the first tapered rod, the second tapered rod, rubber column, locating slot, spring, pressure gauge
It is matched with column shape container, when pressure adjusts suitable in closed container, presses down on handle, handle drives the second cone by shaft
Shape bar moves down, and the second tapered rod is pressed down against first tapered rod in multiple first tapered rods, first taper
For bar to close to the movement of the direction of sliding slot, first tapered rod drives corresponding slide bar to mobile, the slide bar close to the direction of sliding slot
It drives corresponding rubber column to be caught in locating slot, limits the position of turntable, and then limit the position of slide plate and piston plate, avoid living
Seben is mobile and pressure in closed container is caused to change；
The present invention is mobile by rotation driven by rotary disc piston plate, can adjust when piston plate moves up and down in sliding slot closed
The pressure value of tainer air, and it is capable of fixing the position of turntable, and then turntable is avoided accidentally to be touched and lead to closed container internal pressure
Power changes.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of buoyancy teaching demonstration proposed by the present invention；
Fig. 2 is a kind of structural schematic diagram of the part A of buoyancy teaching demonstration proposed by the present invention；
Fig. 3 is a kind of structural schematic diagram of the part B of buoyancy teaching demonstration proposed by the present invention；
Fig. 4 is a kind of structural schematic diagram of the C portion of buoyancy teaching demonstration proposed by the present invention；
Fig. 5 is a kind of structural schematic diagram of the part D of buoyancy teaching demonstration proposed by the present invention.
In figure：1- pedestal, 2- closed container, 3- forcing pipe, 4- sliding slot, 5- conduit, 6- turntable, 7- screw rod, 8- slide plate, 9-
Bracket, 10- piston plate, 11- groove, 12- slide bar, 13- annular groove, the first tapered rod of 14-, 15- mounting hole, 16- shaft, 17-
Second tapered rod, 18- handle, 19- positioning ring, 20- rubber column, 21- locating slot, 22- spring, 23- pressure gauge, 24- column are held
Device, 25- rubber stopper, 26- bearing.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment：
Fig. 1-5 is please referred to, the present invention provides a kind of technical solution：
The top two sides of a kind of buoyancy teaching demonstration, including pedestal 1, pedestal 1 are fixedly installed with closed container 2 respectively
With forcing pipe 3, the top of forcing pipe 3 is equipped with sliding slot 4, is connected with conduit 5 on forcing pipe 3, one end of conduit 5 extends to forcing pipe
3, the other end of conduit 5 extends in closed container 2, and the top of forcing pipe 3 is rotatably equipped with turntable 6, and the bottom of turntable 6 is fixed
Screw rod 7 is installed, thread bush is equipped with slide plate 8 on screw rod 7, and the two sides of the bottom of slide plate 8 are fixedly installed with bracket 9, two brackets 9
Bottom end be fixedly installed with the same piston plate 10, slide plate 8 and piston plate 10 are slidably mounted in sliding slot 4；The top of forcing pipe 3
Portion offers multiple grooves 11, and slide bar 12 is slidably fitted in groove 11, and the bottom of turntable 6 offers annular groove 13, slide bar 12
Top extend in annular groove 13 and be fixedly installed with the first tapered rod 14, offer mounting hole in the top inner wall of annular groove 13
15, be equipped with the shaft 16 being vertically arranged in mounting hole 15, the outside sliding sleeve of shaft 16 is equipped with positioning ring 19, positioning ring 19 it is outer
Side is fixedly mounted on the side wall of mounting hole 15, and the bottom end of shaft 16 is fixedly installed with the second tapered rod 17, the second tapered rod 17
Outside and multiple first tapered rods 14 in first tapered rod 14 outside sliding contact, the top of shaft 16 extends to
The top of turntable 6 is simultaneously fixedly installed with handle 18, and slide bar 12 is fixedly installed with rubber column 20, rubber column close to the side of sliding slot 4
20 are located in annular groove 13, and locating slot 21 compatible with rubber column 20, slide bar 12 are offered in the inside side walls of annular groove 13
Spring 22 is welded on the side inner wall of sliding slot 4, and spring 22 is close to one end of sliding slot 4 with corresponding groove 11 close to sliding slot
4 side inner wall mutually welds, in pedestal 1, closed container 2, forcing pipe 3, sliding slot 4, conduit 5, turntable 6, screw rod 7, slide plate 8, branch
Frame 9, piston plate 10, mounting hole 15, shaft 16, handle 18, positioning ring 19, rubber stopper 25 and bearing 26 cooperation under, shake
Handle 18, handle 18 drive turntable 6 to rotate by shaft 16 and positioning ring 19, and turntable 6 drives screw rod 7 to rotate, and screw rod 7 passes through spiral shell
Pit drives slide plate 8 to slide in sliding slot 4, and slide plate 8 drives piston plate 10 to slide in sliding slot 4 by bracket 9, and piston plate 10 exists
The pressure in closed container 2 can be adjusted when moving up and down in sliding slot 4, and can be measured in closed container 2 by pressure gauge 23
Pressure size；In groove 11, slide bar 12, annular groove 13, the first tapered rod 14, the second tapered rod 17, rubber column 20, locating slot
21, under the cooperation of spring 22, pressure gauge 23 and column shape container 24, when pressure adjusts suitable in closed container 2, handle is pressed down on
Hand 18, handle 18 drive the second tapered rod 17 to move down by shaft 16, and the second tapered rod 17 is pressed down against multiple first cones
First tapered rod 14 in shape bar 14, first tapered rod 14 is to close to the movement of the direction of sliding slot 4, first taper
Bar 14 drives corresponding slide bar 12 to close to the movement of the direction of sliding slot 4, and slide bar 12 drives corresponding rubber column 20 to be caught in locating slot
In 21, the position of turntable 6 is limited, and then limit the position of slide plate 8 and piston plate 10, avoids piston plate 10 mobile and cause closed
Pressure changes in container 2；The present invention drives piston plate 10 mobile by rotation turntable 6, piston plate 10 in sliding slot 4 up and down
The pressure value of air in closed container 2 can be adjusted when mobile, and is capable of fixing the position of turntable 6, and then turntable 6 is avoided to be missed
It touches and pressure in closed container 2 is caused to change.
In the present embodiment, it is fixedly installed with gag lever post 23 on the side wall of groove 11, slide bar 12 is slidably located in corresponding limit
On the bar 23 of position, spring 22 is slidably located on corresponding gag lever post 23, and the outside of piston plate 10 is fixedly installed with sealing ring, sealing
The outside of circle and the side walls of sliding slot 4 are tightly connected, and fixing sleeve is equipped with bearing 26 on screw rod 7, are fixed on the outer ring of bearing 26
Mounting rod is installed, mounting rod is fixedly mounted on the side wall of sliding slot 4, and the top of slide plate 8 offers threaded hole, screw rod 7 and spiral shell
Pit is threadedly coupled, and forcing pipe 3 is fixedly installed with pressure gauge 23, and pressure gauge 23 and 4 phase of sliding slot far from the side of closed container 2
It is connected to, is placed with column shape container 24 in closed container 2, fixing sleeve is equipped with rubber stopper 25 on conduit 4, and rubber stopper 25 is movably arranged on
On column shape container 2, the cross section of slide plate 8 and the cross section of sliding slot 4 are rectangular configuration, in pedestal 1, closed container 2, forcing pipe
3, sliding slot 4, conduit 5, turntable 6, screw rod 7, slide plate 8, bracket 9, piston plate 10, mounting hole 15, shaft 16, handle 18, positioning ring
19, under the cooperation of rubber stopper 25 and bearing 26, shake handle 18, handle 18 drives turntable 6 by shaft 16 and positioning ring 19
Rotation, turntable 6 drive screw rod 7 to rotate, and screw rod 7 drives slide plate 8 to slide in sliding slot 4 by threaded hole, and slide plate 8 passes through bracket 9
It drives piston plate 10 to slide in sliding slot 4, the pressure in closed container 2 can be adjusted when piston plate 10 moves up and down in sliding slot 4
Power, and the pressure size in closed container 2 can be measured by pressure gauge 23；In groove 11, slide bar 12, annular groove 13, first
Tapered rod 14, the second tapered rod 17, rubber column 20, locating slot 21, spring 22, pressure gauge 23 and column shape container 24 cooperation it
Under, when pressure adjusts suitable in closed container 2, handle 18 is pressed down on, handle 18 drives the second tapered rod 17 by shaft 16
It moves down, the second tapered rod 17 is pressed down against first tapered rod 14 in multiple first tapered rods 14, one first cone
For shape bar 14 to close to the movement of the direction of sliding slot 4, first tapered rod 14 drives corresponding slide bar 12 to the direction close to sliding slot 4
Mobile, slide bar 12 drives corresponding rubber column 20 to be caught in locating slot 21, limits the position of turntable 6, and then limits slide plate 8 and live
The position of seben 10 avoids piston plate 10 mobile and pressure in closed container 2 is caused to change；The present invention passes through rotation turntable
6 drive piston plate 10 mobile, and the pressure value of air in closed container 2 can be adjusted when piston plate 10 moves up and down in sliding slot 4,
And it is capable of fixing the position of turntable 6, and then turntable 6 is avoided accidentally to be touched and pressure in closed container 2 is caused to change.
The working principle of the invention：In use, the injected clear water into closed container 2, then rubber stopper 25 beyond the Great Wall, work as needs
When adjusting the pressure in closed container 2, shake handle 18, handle 18 drives turntable 6 to rotate by shaft 16 and positioning ring 19, turns
Disk 6 rotates at the top of forcing pipe 3, and turntable 6 drives screw rod 7 to rotate, due to being threadedly coupled between screw rod 7 and slide plate 8, and it is sliding
The cross section of plate 8 and the cross section of sliding slot 4 are rectangular configuration, so slide plate 8 will not be rotated together with screw rod 7, screw rod 7 passes through
Threaded hole drives slide plate 8 to slide in sliding slot 4, and slide plate 8 drives piston plate 10 to slide in sliding slot 4 by bracket 9, piston plate 10
On sealing ring can guarantee the leakproofness between piston plate 10 and sliding slot 4, when piston plate 10 moves up, due to sliding slot 4
It is connected to by conduit 5 with closed container 2, so volume of air becomes larger in closed container 2, pressure will become smaller in closed container 2, when
When piston plate 10 moves down, volume of air becomes smaller in closed container 2, and pressure increases, and can be measured by pressure gauge 23 close
The pressure size in container 2 is closed, when pressure adjusts suitable in closed container 2, presses down on handle 18, handle 18 passes through shaft
16 the second tapered rods 17 of drive move down, and the second tapered rod 17 is pressed down against one first cone in multiple first tapered rods 14
Shape bar 14, so that first tapered rod 14 is to close to the movement of the direction of sliding slot 4, first tapered rod 14 drives corresponding cunning
To close to the movement of the direction of sliding slot 4, slide bar 12 drives corresponding rubber column 20 to be caught in locating slot 21, can limit turntable bar 12
6 position, and then the position of slide plate 8 and piston plate 10 is limited, it avoids piston plate 10 mobile and pressure in closed container 2 is caused to send out
Changing.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. a kind of buoyancy teaching demonstration, including pedestal (1), the top two sides of the pedestal (1) are fixedly installed with close respectively
Container (2) and forcing pipe (3) are closed, the top of forcing pipe (3) is equipped with sliding slot (4), is connected with conduit (5), conduit on forcing pipe (3)
(5) one end extends to forcing pipe (3), and the other end of conduit (5) extends in closed container (2)：It is characterized in that：It is described to add
It is rotatably equipped at the top of pressure pipe (3) turntable (6), the bottom of turntable (6) is fixedly installed with screw rod (7), thread bush on screw rod (7)
Equipped with slide plate (8), the two sides of the bottom of slide plate (8) are fixedly installed with bracket (9), and the bottom end of two brackets (9) is fixedly installed with
The same piston plate (10), slide plate (8) and piston plate (10) are slidably mounted in sliding slot (4)；
It offers at the top of forcing pipe (3) multiple grooves (11), is slidably fitted with slide bar (12) in groove (11), turntable (6)
Bottom offers annular groove (13), and the top of slide bar (12) extends in annular groove (13) and is fixedly installed with the first tapered rod
(14), it is offered mounting hole (15) in the top inner wall of annular groove (13), the shaft being vertically arranged is equipped in mounting hole (15)
(16), the outside sliding sleeve of the shaft (16) is equipped with positioning ring (19), and positioning ring is fixedly mounted on mounting hole on the outside of (19)
(15) on side wall, the bottom end of shaft (16) is fixedly installed with the second tapered rod (17), the outside of second tapered rod (17)
Prolong with the top of the outside sliding contact of first tapered rod (14) in multiple first tapered rods (14), the shaft (16)
It extends to the top of turntable (6) and is fixedly installed with handle (18), the slide bar (12) is fixedly installed with close to the side of sliding slot (4)
Rubber column (20), the rubber column (20) are located in annular groove (13), offered in the inside side walls of the annular groove (13) with
The compatible locating slot (21) of rubber column (20), the slide bar (12) are welded with spring on the side inner wall of sliding slot (4)
(22), the spring (22) is mutually welded close to the one end of sliding slot (4) with the side inner wall of corresponding groove (11) close sliding slot (4)
It connects.
2. buoyancy teaching demonstration according to claim 1, it is characterised in that：
It is fixedly installed with gag lever post (23) on the side wall of the groove (11), the slide bar (12) is slidably located in corresponding limit
On bar (23), the spring (22) is slidably located on corresponding gag lever post (23).
3. buoyancy teaching demonstration according to claim 1, it is characterised in that：
Sealing ring, the outside of the sealing ring and the side walls of sliding slot (4) are fixedly installed on the outside of the piston plate (10)
It is tightly connected.
4. buoyancy teaching demonstration according to claim 1, it is characterised in that：
Fixing sleeve is equipped with bearing (26) on the screw rod (7), is fixedly installed with mounting rod on the outer ring of the bearing (26), described
Mounting rod is fixedly mounted on the side wall of sliding slot (4).
5. buoyancy teaching demonstration according to claim 1, it is characterised in that：
Threaded hole is offered at the top of the slide plate (8), the screw rod (7) is threadedly coupled with threaded hole.
6. buoyancy teaching demonstration according to claim 1, it is characterised in that：
The forcing pipe (3) is fixedly installed with pressure gauge (23) far from the side of closed container (2), and pressure gauge (23) and sliding slot
(4) it is connected.
7. buoyancy teaching demonstration according to claim 1, it is characterised in that：
It is placed with column shape container (24) in the closed container (2), fixing sleeve is equipped with rubber stopper (25) on the conduit (4), institute
Rubber stopper (25) is stated to be movably arranged on column shape container (2).
8. buoyancy teaching demonstration according to claim 1, it is characterised in that：
The cross section of the slide plate (8) and the cross section of sliding slot (4) are rectangular configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810792075.6A CN108922342B (en) | 2018-07-18 | 2018-07-18 | Aquatic buoyancy demonstration teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810792075.6A CN108922342B (en) | 2018-07-18 | 2018-07-18 | Aquatic buoyancy demonstration teaching |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108922342A true CN108922342A (en) | 2018-11-30 |
| CN108922342B CN108922342B (en) | 2020-09-01 |
Family
ID=64415125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810792075.6A Active CN108922342B (en) | 2018-07-18 | 2018-07-18 | Aquatic buoyancy demonstration teaching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108922342B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109616003A (en) * | 2019-01-31 | 2019-04-12 | 浙江理工大学 | A kind of mechanical kinetic energy transmission teaching guidance model |
| CN109712495A (en) * | 2019-03-14 | 2019-05-03 | 西华师范大学 | A kind of Archimedes principle demonstrator |
| CN110211461A (en) * | 2019-05-15 | 2019-09-06 | 浙江商业职业技术学院 | Transparent type pressure and temp relation test instrument |
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| CN207536507U (en) * | 2018-03-19 | 2018-06-26 | 上海生生物流有限公司 | A kind of double-layered vacuum heat-insulation layer of barrel-shaped incubator |
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| CN2217956Y (en) * | 1994-11-24 | 1996-01-24 | 王森 | Portable shoe polisher |
| CN101479496A (en) * | 2006-06-27 | 2009-07-08 | 博格华纳公司 | Three position control solenoid for hydraulic activation |
| CN202280776U (en) * | 2011-09-26 | 2012-06-20 | 江苏大学 | Air spring auxiliary air chamber structure with variable volume |
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| CN110211461A (en) * | 2019-05-15 | 2019-09-06 | 浙江商业职业技术学院 | Transparent type pressure and temp relation test instrument |
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| Publication number | Publication date |
|---|---|
| CN108922342B (en) | 2020-09-01 |
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