CN108922342B - Aquatic buoyancy demonstration teaching - Google Patents
Aquatic buoyancy demonstration teaching Download PDFInfo
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- CN108922342B CN108922342B CN201810792075.6A CN201810792075A CN108922342B CN 108922342 B CN108922342 B CN 108922342B CN 201810792075 A CN201810792075 A CN 201810792075A CN 108922342 B CN108922342 B CN 108922342B
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- sliding
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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
Abstract
The invention discloses a water buoyancy demonstration teaching device which comprises a base, wherein a closed container and a pressurizing pipe are fixedly installed on two sides of the top of the base respectively, a sliding groove is formed in the top of the pressurizing pipe, a guide pipe is connected onto the pressurizing pipe, one end of the guide pipe extends into the pressurizing pipe, the other end of the guide pipe extends into the closed container, a rotary table is rotatably installed on the top of the pressurizing pipe, a lead screw is fixedly installed at the bottom of the rotary table, a sliding plate is sleeved on the lead screw in a threaded mode, supports are fixedly installed on two sides of the bottom of the sliding plate, the same piston plate is fixedly installed at the bottom ends of the two supports, the sliding plate and the piston plate are both slidably installed in the sliding groove. According to the invention, the piston plate is driven to move by rotating the turntable, the pressure value of air in the closed container can be adjusted when the piston plate moves up and down in the chute, and the position of the turntable can be fixed, so that the pressure in the closed container is prevented from changing due to mistaken collision of the turntable.
Description
Technical Field
The invention relates to the technical field of teaching instruments, in particular to a demonstration teaching for buoyancy in water.
Background
The teaching practice of the physics of middle school to buoyancy generally adopts the mode of saying and educating to impart knowledge to students, and students can only passively accept in duck-type, and theoretical connection is not practical, and the teaching effect is relatively poor. In the prior art, some buoyancy demonstration devices are provided, and only the relation between gravity and buoyancy can be simply demonstrated, and the demonstration phenomenon is stiff. Through retrieval, patent document No. 201310652561.5 discloses a buoyancy teaching demonstration instrument. The demonstration instrument comprises a transparent closed container, liquid is filled in the closed container, a section of gap is formed between the liquid level of the liquid and the top of the closed container, the gap is communicated with a needle tube through a guide tube, a columnar container filled with the liquid is arranged in the closed container, a section of gap is also formed between the top of the columnar container and the liquid level in the columnar container, and a thin tube is arranged at the bottom of the columnar container and is communicated with the liquid in the closed container and the liquid in the columnar container. The demonstration instrument can intuitively and interestingly demonstrate the relation between gravity and buoyancy and can intuitively explain an ideal gas state equation.
However, the demonstration instrument in design is inconvenient for adjusting the pressure in the columnar container, and the position of the piston in the needle tube needs to be continuously fixed manually after the pressure in the columnar container is adjusted, so that the pressure in the columnar container can be kept, and the operation is troublesome.
Disclosure of Invention
Aiming at the problems, the invention provides a demonstration teaching of buoyancy in water, which can effectively solve the problem of inconvenient regulation of the pressure in a columnar container in the background technology, can fix the pressure value of the columnar container after the pressure in the columnar container is regulated properly, and is convenient to operate.
In order to achieve the purpose, the invention provides the following technical scheme:
the underwater buoyancy demonstration teaching device comprises a base, wherein a closed container and a pressure pipe are fixedly mounted on two sides of the top of the base respectively, a sliding groove is formed in the top of the pressure pipe, a guide pipe is connected onto the pressure pipe, one end of the guide pipe extends to the pressure pipe, the other end of the guide pipe extends into the closed container, a rotary table is rotatably mounted on the top of the pressure pipe, a lead screw is fixedly mounted at the bottom of the rotary table, a sliding plate is sleeved on the lead screw in a threaded manner, supports are fixedly mounted on two sides of the bottom of the sliding plate, the same piston plate is fixedly mounted at the bottom ends of the two supports, and the sliding;
the top of the pressure pipe is provided with a plurality of grooves, a slide rod is slidably mounted in the grooves, the bottom of the rotary table is provided with a ring groove, the top end of the slide rod extends into the ring groove and is fixedly provided with a first conical rod, the inner wall of the top of the ring groove is provided with a mounting hole, a vertically arranged rotary shaft is arranged in the mounting hole, the outer side of the rotary shaft is slidably sleeved with a positioning ring, the outer side of the positioning ring is fixedly mounted on the side wall of the mounting hole, the bottom end of the rotary shaft is fixedly provided with a second conical rod, the outer side of the second conical rod is in sliding contact with the outer side of one first conical rod of the first conical rods, the top end of the rotary shaft extends to the upper part of the rotary table and is fixedly provided with a handle, one side of the slide rod close to the slide groove is fixedly provided with, the sliding rod is welded on the inner wall of one side close to the sliding groove, and one end of the spring close to the sliding groove is welded with the inner wall of one side, close to the sliding groove, of the corresponding groove.
As a preferred technical scheme of the present invention, the side wall of the groove is fixedly provided with a limiting rod, the sliding rod is slidably sleeved on the corresponding limiting rod, and the spring is slidably sleeved on the corresponding limiting rod.
As a preferable technical solution of the present invention, a sealing ring is fixedly installed on an outer side of the piston plate, and an outer side of the sealing ring is in sliding sealing connection with a side wall of the chute.
As a preferred technical scheme of the invention, the screw rod is fixedly sleeved with a bearing, an outer ring of the bearing is fixedly provided with an installation rod, and the installation rod is fixedly installed on the side wall of the sliding groove.
As a preferable technical scheme, the top of the sliding plate is provided with a threaded hole, and the screw rod is in threaded connection with the threaded hole.
As a preferable technical scheme, a pressure gauge is fixedly installed on one side, away from the closed container, of the pressurizing pipe, and the pressure gauge is communicated with the sliding groove.
As a preferable technical scheme of the invention, a columnar container is placed in the closed container, a rubber plug is fixedly sleeved on the guide pipe, and the rubber plug is movably arranged on the closed container.
As a preferable technical scheme of the invention, the cross section of the sliding plate and the cross section of the sliding chute are both rectangular structures.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a demonstration teaching of buoyancy in water, which is characterized in that a base, a closed container, a pressurizing pipe, a sliding chute, a conduit, a rotary table, a lead screw, a sliding plate, a bracket, a piston plate, a mounting hole, a rotary shaft, a handle, a positioning ring, a rubber plug and a bearing are matched, the handle is shaken, the rotary table is driven to rotate by the rotary shaft and the positioning ring, the rotary table drives the lead screw to rotate, the lead screw drives the sliding plate to slide in the sliding chute through a threaded hole, the sliding plate drives the piston plate to slide in the sliding chute through the bracket, the piston plate can adjust the pressure in the closed container when moving up and down in the;
the pressure gauge is matched with a columnar container through a groove, sliding rods, an annular groove, a first conical rod, a second conical rod, a rubber column, a positioning groove, a spring, the pressure gauge and the columnar container, when the pressure in the sealed container is adjusted properly, a handle is pressed downwards, the handle drives a second conical rod to move downwards through a rotating shaft, the second conical rod downwards extrudes one first conical rod in the first conical rods, one first conical rod moves towards the direction close to the sliding groove, one first conical rod drives the corresponding sliding rod to move towards the direction close to the sliding groove, the sliding rod drives the corresponding rubber column to be clamped into the positioning groove, the position of a rotary table is limited, the positions of a sliding plate and a piston plate are further limited, and the pressure in the sealed container is prevented from changing due to the movement of the;
according to the invention, the piston plate is driven to move by rotating the turntable, the pressure value of air in the closed container can be adjusted when the piston plate moves up and down in the chute, and the position of the turntable can be fixed, so that the pressure in the closed container is prevented from changing due to mistaken collision of the turntable.
Drawings
FIG. 1 is a schematic structural view of a water buoyancy demonstration teaching provided by the present invention;
FIG. 2 is a schematic structural diagram of part A of an aquatic buoyancy demonstration teaching provided by the present invention;
FIG. 3 is a schematic structural diagram of part B of an aquatic buoyancy demonstration teaching provided by the present invention;
FIG. 4 is a schematic structural diagram of part C of an aquatic buoyancy demonstration teaching provided by the present invention;
fig. 5 is a schematic structural diagram of a part D of an aquatic buoyancy demonstration teaching provided by the present invention.
In the figure: 1-base, 2-closed container, 3-pressure tube, 4-chute, 5-conduit, 6-rotary table, 7-lead screw, 8-slide plate, 9-support, 10-piston plate, 11-groove, 12-slide bar, 13-ring groove, 14-first conical rod, 15-mounting hole, 16-rotary shaft, 17-second conical rod, 18-handle, 19-positioning ring, 20-rubber column, 21-positioning groove, 22-spring, 23-spacing rod, 24-column container, 25-rubber plug, 26-bearing, 27 pressure gauge.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
referring to fig. 1-5, the present invention provides a technical solution:
a demonstration teaching of buoyancy in water comprises a base 1, wherein two sides of the top of the base 1 are respectively fixedly provided with a closed container 2 and a pressure pipe 3, the top of the pressure pipe 3 is provided with a chute 4, the pressure pipe 3 is connected with a guide pipe 5, one end of the guide pipe 5 extends into the pressure pipe 3, the other end of the guide pipe 5 extends into the closed container 2, the top of the pressure pipe 3 is rotatably provided with a turntable 6, the bottom of the turntable 6 is fixedly provided with a lead screw 7, the lead screw 7 is sleeved with a sliding plate 8 through threads, two sides of the bottom of the sliding plate 8 are both fixedly provided with brackets 9, the bottom ends of the two brackets 9 are fixedly provided with the same piston plate 10, and the sliding plate 8 and the; the top of the pressure pipe 3 is provided with a plurality of grooves 11, a slide rod 12 is slidably mounted in each groove 11, the bottom of the rotary table 6 is provided with an annular groove 13, the top end of the slide rod 12 extends into the annular groove 13 and is fixedly provided with a first tapered rod 14, the inner wall of the top of the annular groove 13 is provided with a mounting hole 15, a vertically arranged rotary shaft 16 is arranged in the mounting hole 15, the outer side of the rotary shaft 16 is slidably sleeved with a positioning ring 19, the outer side of the positioning ring 19 is fixedly mounted on the side wall of the mounting hole 15, the bottom end of the rotary shaft 16 is fixedly provided with a second tapered rod 17, the outer side of the second tapered rod 17 is in sliding contact with the outer side of one first tapered rod 14 of the first tapered rods 14, the top end of the rotary shaft 16 extends to the upper side of the rotary table 6 and is fixedly provided with a handle 18, one side of the slide rod 12 close to the sliding chute 4 is fixedly provided, a spring 22 is welded on the inner wall of one side of the sliding rod 12 close to the sliding chute 4, one end of the spring 22 close to the sliding chute 4 is welded with the inner wall of one side of the corresponding groove 11 close to the sliding chute 4, under the matching of a base 1, a closed container 2, a pressure pipe 3, a chute 4, a conduit 5, a rotary table 6, a screw rod 7, a sliding plate 8, a support 9, a piston plate 10, a mounting hole 15, a rotating shaft 16, a handle 18, a positioning ring 19, a rubber plug 25 and a bearing 26, the handle 18 is shaken, the handle 18 drives the rotary table 6 to rotate through the rotating shaft 16 and the positioning ring 19, the rotary table 6 drives the screw rod 7 to rotate, the screw rod 7 drives the sliding plate 8 to slide in the chute 4 through a threaded hole, the sliding plate 8 drives the piston plate 10 to slide in the chute 4 through the support 9, the pressure in the closed container 2 can be adjusted when the piston plate 10 moves up and down in the chute 4, and the pressure in the closed container 2; under the matching of the groove 11, the sliding rods 12, the annular groove 13, the first conical rods 14, the second conical rods 17, the rubber columns 20, the positioning grooves 21, the spring 22, the pressure gauge 27 and the columnar container 24, when the pressure in the closed container 2 is properly adjusted, the handle 18 is pressed downwards, the handle 18 drives the second conical rods 17 to move downwards through the rotating shaft 16, the second conical rods 17 downwards press one first conical rod 14 of the first conical rods 14, one first conical rod 14 moves towards the direction close to the sliding groove 4, one first conical rod 14 drives the corresponding sliding rod 12 to move towards the direction close to the sliding groove 4, the sliding rod 12 drives the corresponding rubber column 20 to be clamped into the positioning groove 21, the position of the rotating disc 6 is limited, the positions of the sliding plate 8 and the piston plate 10 are further limited, and the pressure in the closed container 2 is prevented from changing due to the movement of the piston plate 10; according to the invention, the piston plate 10 is driven to move by rotating the rotary table 6, the pressure value of the air in the closed container 2 can be adjusted when the piston plate 10 moves up and down in the chute 4, and the position of the rotary table 6 can be fixed, so that the pressure in the closed container 2 is prevented from changing due to mistaken collision of the rotary table 6.
In the embodiment, a limit rod 23 is fixedly installed on the side wall of the groove 11, a slide rod 12 is slidably sleeved on the corresponding limit rod 23, a spring 22 is slidably sleeved on the corresponding limit rod 23, a seal ring is fixedly installed on the outer side of the piston plate 10, the outer side of the seal ring is slidably and hermetically connected with the side wall of the chute 4, a bearing 26 is fixedly sleeved on the lead screw 7, an installation rod is fixedly installed on the outer ring of the bearing 26, the installation rod is fixedly installed on the side wall of the chute 4, a threaded hole is formed in the top of the sliding plate 8, the lead screw 7 is in threaded connection with the threaded hole, a pressure gauge 27 is fixedly installed on one side of the pressure pipe 3 away from the sealed container 2 and communicated with the chute 4, a columnar container 24 is placed in the sealed container 2, a rubber plug 25 is fixedly sleeved on the guide pipe 4, the rubber plug 25 is movably installed, under the matching of a base 1, a closed container 2, a pressure pipe 3, a chute 4, a conduit 5, a rotary table 6, a screw rod 7, a sliding plate 8, a support 9, a piston plate 10, a mounting hole 15, a rotating shaft 16, a handle 18, a positioning ring 19, a rubber plug 25 and a bearing 26, the handle 18 is shaken, the handle 18 drives the rotary table 6 to rotate through the rotating shaft 16 and the positioning ring 19, the rotary table 6 drives the screw rod 7 to rotate, the screw rod 7 drives the sliding plate 8 to slide in the chute 4 through a threaded hole, the sliding plate 8 drives the piston plate 10 to slide in the chute 4 through the support 9, the pressure in the closed container 2 can be adjusted when the piston plate 10 moves up and down in the chute 4, and the pressure in the closed container 2; under the matching of the groove 11, the sliding rods 12, the annular groove 13, the first conical rods 14, the second conical rods 17, the rubber columns 20, the positioning grooves 21, the spring 22, the pressure gauge 27 and the columnar container 24, when the pressure in the closed container 2 is properly adjusted, the handle 18 is pressed downwards, the handle 18 drives the second conical rods 17 to move downwards through the rotating shaft 16, the second conical rods 17 downwards press one first conical rod 14 of the first conical rods 14, one first conical rod 14 moves towards the direction close to the sliding groove 4, one first conical rod 14 drives the corresponding sliding rod 12 to move towards the direction close to the sliding groove 4, the sliding rod 12 drives the corresponding rubber column 20 to be clamped into the positioning groove 21, the position of the rotating disc 6 is limited, the positions of the sliding plate 8 and the piston plate 10 are further limited, and the pressure in the closed container 2 is prevented from changing due to the movement of the piston plate 10; according to the invention, the piston plate 10 is driven to move by rotating the rotary table 6, the pressure value of the air in the closed container 2 can be adjusted when the piston plate 10 moves up and down in the chute 4, and the position of the rotary table 6 can be fixed, so that the pressure in the closed container 2 is prevented from changing due to mistaken collision of the rotary table 6.
The working principle of the invention is as follows: when the device is used, clean water is injected into the closed container 2, the rubber plug 25 is plugged, when the pressure in the closed container 2 needs to be adjusted, the handle 18 is shaken, the handle 18 drives the rotary table 6 to rotate through the rotating shaft 16 and the positioning ring 19, the rotary table 6 rotates at the top of the pressurizing pipe 3, the rotary table 6 drives the screw rod 7 to rotate, as the screw rod 7 is in threaded connection with the sliding plate 8, and the cross section of the sliding plate 8 and the cross section of the sliding groove 4 are both in a rectangular structure, the sliding plate 8 cannot rotate along with the screw rod 7, the screw rod 7 drives the sliding plate 8 to slide in the sliding groove 4 through a threaded hole, the sliding plate 8 drives the piston plate 10 to slide in the sliding groove 4 through the bracket 9, the sealing ring on the piston plate 10 can ensure the sealing performance between the piston plate 10 and the sliding groove 4, when the piston plate 10 moves upwards, as the sliding groove 4 is, the pressure in the closed vessel 2 becomes small, and when the piston plate 10 moves downward, the volume of air in the closed vessel 2 becomes small, the pressure increases, and the pressure in the closed vessel 2 can be measured by the pressure gauge 27, when the pressure in the closed container 2 is properly adjusted, the handle 18 is pressed downwards, the handle 18 drives the second tapered rod 17 to move downwards through the rotating shaft 16, the second tapered rod 17 presses one first tapered rod 14 in the plurality of first tapered rods 14 downwards, so that a first tapered rod 14 moves towards the direction close to the sliding chute 4, a first tapered rod 14 drives the corresponding sliding rod 12 to move towards the direction close to the sliding chute 4, the sliding rod 12 drives the corresponding rubber column 20 to be clamped into the positioning groove 21, the position of the rotating disc 6 can be limited, thereby limiting the positions of the slide plate 8 and the piston plate 10 and preventing the piston plate 10 from moving to cause the change of the pressure in the closed container 2.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The utility model provides an aquatic buoyancy demonstration teaching, includes base (1), the top both sides of base (1) fixed mounting respectively have closed container (2) and forcing pipe (3), and the top of forcing pipe (3) is equipped with spout (4), is connected with pipe (5) on forcing pipe (3), and the one end of pipe (5) extends to forcing pipe (3), and the other end of pipe (5) extends to in closed container (2): the method is characterized in that: the top of the pressure pipe (3) is rotatably provided with a turntable (6), the bottom of the turntable (6) is fixedly provided with a lead screw (7), the lead screw (7) is sleeved with a sliding plate (8) in a threaded manner, two sides of the bottom of the sliding plate (8) are both fixedly provided with brackets (9), the bottom ends of the two brackets (9) are fixedly provided with the same piston plate (10), and the sliding plate (8) and the piston plate (10) are both arranged in the sliding chute (4) in a sliding manner;
a plurality of grooves (11) are formed in the top of the pressurizing pipe (3), a sliding rod (12) is arranged in each groove (11), an annular groove (13) is formed in the bottom of the rotary table (6), a first conical rod (14) is fixedly arranged in the annular groove (13) at the top end of the sliding rod (12), a mounting hole (15) is formed in the inner wall of the top of the annular groove (13), a vertically-arranged rotary shaft (16) is arranged in the mounting hole (15), a positioning ring (19) is slidably sleeved on the outer side of the rotary shaft (16), the outer side of the positioning ring (19) is fixedly arranged on the side wall of the mounting hole (15), a second conical rod (17) is fixedly arranged at the bottom end of the rotary shaft (16), the outer side of the second conical rod (17) is in sliding contact with the outer side of one first conical rod (14) of the plurality of first conical rods (14), the top end of the rotary shaft (16) extends to the upper portion of the, a rubber column (20) is fixedly mounted on one side, close to the sliding groove (4), of the sliding rod (12), the rubber column (20) is located in the annular groove (13), a positioning groove (21) matched with the rubber column (20) is formed in the side wall of the inner side of the annular groove (13), a spring (22) is welded on the inner wall of one side, close to the sliding groove (4), of the sliding rod (12), and one end, close to the sliding groove (4), of the spring (22) is welded with the inner wall of one side, close to the sliding groove (4), of the corresponding groove (11);
when the pressure adjusting device is used, when the pressure in the closed container (2) needs to be adjusted, the handle (18) is shaken, the handle (18) drives the rotary table (6) to rotate through the rotating shaft (16) and the positioning ring (19), the rotary table (6) rotates at the top of the pressurizing pipe (3), the rotary table (6) drives the screw rod (7) to rotate, the screw rod (7) drives the sliding plate (8) to slide in the sliding groove (4) through a threaded hole, the sliding plate (8) drives the piston plate (10) to slide in the sliding groove (4) through the support (9), when the pressure in the closed container (2) is adjusted properly, the handle (18) is pressed downwards, the handle (18) drives the second conical rod (17) to move downwards through the rotating shaft (16), and the second conical rod (17) downwards extrudes one first conical rod (14) of the plurality of first conical rods (14), the first conical rod (14) is enabled to move towards the direction close to the sliding groove (4), the first conical rod (14) drives the corresponding sliding rod (12) to move towards the direction close to the sliding groove (4), the sliding rod (12) drives the corresponding rubber column (20) to be clamped into the positioning groove (21), the position of the rotary table (6) can be limited, and then the positions of the sliding plate (8) and the piston plate (10) are limited.
2. The demonstration teaching of buoyancy in water of claim 1, wherein:
the side wall of the groove (11) is fixedly provided with a limiting rod (23), the sliding rod (12) is sleeved on the corresponding limiting rod (23) in a sliding mode, and the spring (22) is sleeved on the corresponding limiting rod (23) in a sliding mode.
3. The demonstration teaching of buoyancy in water of claim 1, wherein:
the outside fixed mounting of piston board (10) has the sealing washer, the outside and the lateral wall sliding seal of spout (4) of sealing washer are connected.
4. The demonstration teaching of buoyancy in water of claim 1, wherein:
the fixed cover is equipped with bearing (26) on lead screw (7), fixed mounting has the installation pole on the outer lane of bearing (26), installation pole fixed mounting is on the lateral wall of spout (4).
5. The demonstration teaching of buoyancy in water of claim 1, wherein:
the top of the sliding plate (8) is provided with a threaded hole, and the screw rod (7) is in threaded connection with the threaded hole.
6. The demonstration teaching of buoyancy in water of claim 1, wherein:
one side of the pressurizing pipe (3) far away from the closed container (2) is fixedly provided with a pressure gauge (27), and the pressure gauge (27) is communicated with the sliding chute (4).
7. The demonstration teaching of buoyancy in water of claim 1, wherein:
a columnar container (24) is placed in the closed container (2), a rubber plug (25) is fixedly sleeved on the guide pipe (5), and the rubber plug (25) is movably arranged on the closed container (2).
8. The demonstration teaching of buoyancy in water of claim 1, wherein:
the cross section of the sliding plate (8) and the cross section of the sliding groove (4) are both rectangular structures.
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| CN201810792075.6A CN108922342B (en) | 2018-07-18 | 2018-07-18 | Aquatic buoyancy demonstration teaching |
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| CN201810792075.6A CN108922342B (en) | 2018-07-18 | 2018-07-18 | Aquatic buoyancy demonstration teaching |
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| 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 |
| CN110211461B (en) * | 2019-05-15 | 2021-04-13 | 浙江商业职业技术学院 | Transparent pressure-temperature relation tester |
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| CN2217956Y (en) * | 1994-11-24 | 1996-01-24 | 王森 | Portable shoe polisher |
| US8191698B2 (en) * | 2006-06-27 | 2012-06-05 | Borgwarner Inc. | 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 |
| CN103617759B (en) * | 2013-12-05 | 2015-07-01 | 湖州师范学院 | Buoyancy teaching demonstration instrument |
| CN103691498B (en) * | 2014-01-06 | 2015-05-27 | 广州市刑事科学技术研究所 | Liquid-moving machine and method of moving liquid by same |
| CN207570843U (en) * | 2017-11-07 | 2018-07-03 | 王学红 | A kind of medical continuous sampling system |
| 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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