CN216211790U

CN216211790U - Buoyancy demonstration device for physics teaching

Info

Publication number: CN216211790U
Application number: CN202122700533.9U
Authority: CN
Inventors: 杜龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-04-05
Anticipated expiration: 2031-11-05

Abstract

The utility model discloses a buoyancy demonstration device for physical teaching, which relates to the technical field of physical teaching, and comprises a box body, wherein the front side surface of the box body is in an open shape, the top of the box body is connected with a lifting mechanism, the lifting mechanism is connected with two first spring dynamometers, the two spring dynamometers are both connected with demonstration blocks, and a test cup is arranged below the demonstration blocks; the lifting mechanism comprises a worm, a worm wheel, a first gear, a second gear, a first rack, a second rack, a first guide rail, a second guide rail, a first rotating rod and a second rotating rod. According to the utility model, the worm drives the worm wheel to rotate, the worm wheel drives the first gear and the second gear to rotate simultaneously through the first rotating rod, so that the two gears drive the two racks to lift simultaneously, and the two first spring dynamometers can be fixed to a certain same height at any time by utilizing the self-locking property of the worm drive worm wheel, so that the buoyancy and the liquid density can be simultaneously compared when being demonstrated to be related.

Description

Buoyancy demonstration device for physics teaching

Technical Field

The utility model relates to the technical field of physical teaching, in particular to a buoyancy demonstration device for physical teaching.

Background

Buoyancy is the important difficult point of junior high school physics teaching, also is the knowledge point that the examination must be examined, in the teaching process of buoyancy, mr can utilize the spring dynamometer to articulate the object usually, then will articulate the object on the spring dynamometer and immerse into aquatic, we can discover next that the reading of spring dynamometer can diminish, and along with the increase of the volume of submerging of object, the reading of spring dynamometer can be littleer and littleer, after the object is totally submerged, the reading of spring dynamometer no longer changes to this proves that existence and the size of buoyancy are relevant with the volume of the liquid that the object was arranged. Next, the teacher will immerse the same object in the liquid with different densities, at this moment, we will find that when the object is completely immersed, the reading of the spring dynamometer is inconsistent with the reading of the previous object completely immersed in the water, which shows that the buoyancy is related to the density of the liquid, but when the teacher demonstrates that the buoyancy is related to the density of the liquid, the teacher can only put the same object in the liquid with different densities in turn for comparison, such comparison effect is not obvious enough, and the spring dynamometer is carried by a hand inevitably and will shake constantly, which also results in poor demonstration effect.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The utility model provides a buoyancy demonstration device for physics teaching, aiming at solving the problem that the buoyancy and the liquid density cannot be compared simultaneously when demonstrating the correlation between the buoyancy and the liquid density.

The technical scheme adopted by the utility model is as follows: a buoyancy demonstration device for physics teaching comprises a box body, a lifting mechanism, first spring dynamometers, demonstration blocks and a test cup, wherein a cavity is arranged in the box body, the front side surface of the box body is in an open shape, the top of the box body is connected with the lifting mechanism, the lifting mechanism is connected with the two first spring dynamometers, the two first spring dynamometers are both connected with the demonstration blocks, and the test cup is arranged below the demonstration blocks;

the lifting mechanism comprises a worm, a worm wheel, a first gear, a second gear, a first rack, a second rack, a first guide rail, a second guide rail, a first rotating rod and a second rotating rod, wherein the inner surface of the top of the box body is respectively connected with the first guide rail and the second guide rail, the first guide rail and the second guide rail are respectively internally provided with the first rack and the second rack in a slidable manner, the first rack is meshed with the first gear, the first gear is penetrated through with the first rotating rod, the first rotating rod penetrates through the first end sleeve of the first gear and is sleeved with the worm wheel, the first rotating rod penetrates through the second end of the first gear and the rear side surface of the box body in a rotatable manner, the worm is meshed with the worm wheel, the worm rotatably penetrates through the top of the box body, the first gear is further meshed with the second gear, the second rotating rod penetrates through the second gear, one end of the second rotating rod, which deviates from the second gear, is rotatably connected with the rear side surface of the box body, the second gear is also meshed with the second rack, and the bottoms of the first rack and the second rack are detachably connected with the first spring dynamometer.

Furthermore, one end of the worm penetrating out of the top of the box body is connected with a rotating rod.

Furthermore, the bottoms of the first rack and the second rack are both connected with a first hook, and the first spring dynamometer is hung on the first hook.

Further, the first spring force gauge and the demo block are connected by a string.

Furthermore, the demonstration block is provided with scale marks.

Still further, the tick marks include one-quarter tick marks, one-half tick marks, and three-quarter tick marks.

Furthermore, all be connected with the protrusion board on the inner wall of side about the box, protrusion board bottom surface is connected with the second couple, it has the second spring dynamometer to articulate on the second couple, be connected with the graduated flask on the second spring dynamometer, be equipped with the drain pipe on the test cup, the one end that the drain pipe deviates from the test cup stretches into in the graduated flask.

The utility model has the advantages that:

according to the utility model, by rotating the worm, the worm drives the worm wheel to rotate, the worm wheel drives the first rotating rod to rotate, the first rotating rod drives the first gear to rotate, the first gear drives the second gear engaged with the first gear to rotate, when the first gear and the second gear rotate simultaneously, the first rack and the second rack are respectively driven to lift simultaneously, the first rack and the second rack which lift simultaneously can respectively drive the two first spring dynamometers to lift simultaneously, the worm and the worm wheel transmission also have self-locking performance, and when the worm stops rotating, the two first spring dynamometers can be simultaneously fixed to a certain same height. When the buoyancy size needs to be demonstrated and the liquid density is related, the worm is rotated to enable the two first spring dynamometer to respectively drive the two same demonstration blocks to be simultaneously immersed into the two test cups filled with liquids with different densities, when the worm is stopped to rotate, the two first spring dynamometer can be fixed to the same height, the volumes of the two demonstration blocks simultaneously immersed into the two different liquids are consistent, and at the moment, the buoyancy size and the liquid density are related by observing different readings of the two first spring dynamometer, so that the demonstration blocks can be obviously observed. Through the design, when the demonstration buoyancy is related to the liquid density, comparison can be carried out simultaneously, and the same object does not need to be placed into the liquids with different densities in sequence for comparison. Meanwhile, the utility model has simple structure, convenient operation and strong practicability and is worth of being widely popularized.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the first and second guide rail configurations of the present invention;

FIG. 3 is a schematic view of the lift mechanism of the present invention;

fig. 4 is a schematic diagram of a demo block structure of the present invention.

Reference numerals:

1 is a box body; 2 is a lifting mechanism; 21 is a worm; 22 is a worm gear; 23 is a first gear; 24 is a second gear; 25 is a first rack; 26 is a second rack; 27 is a first guide rail; 28 is a second guide rail; 29 is a first rotating rod; 30 is a second rotating rod; 31 is a rotating rod; 3 is a first spring dynamometer; 4 is a demonstration block; 5 is a test cup; 6 is a first hook; 7 is a scale mark; 8 is a convex plate; 9 is a second hook; 10 is a second spring load cell; 11 is a measuring cup; and 12 is a liquid outlet pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1 to 4, a buoyancy demonstration device for physical teaching comprises a box body 1, a lifting mechanism 2, first spring forcemeters 3, demonstration blocks 4 and test cups 5, wherein a cavity is arranged in the box body 1, the front side surface of the box body 1 is in an open shape, the top of the box body 1 is connected with the lifting mechanism 2, the lifting mechanism 2 is connected with the two first spring forcemeters 3, the two first spring forcemeters 3 are both connected with the demonstration blocks 4, the test cups 5 are arranged below the demonstration blocks 4, the lifting mechanism 2 can drive the two first spring forcemeters 3 to simultaneously lift and simultaneously fix at a certain same height, the two test cups 5 are used for placing two liquids with different densities, and when the demonstration blocks 4 respectively connected to the first spring forcemeters 3 are immersed in the liquids in the two test cups 5, the buoyancy and the liquid density can be demonstrated;

the lifting mechanism 2 comprises a worm 21, a worm wheel 22, a first gear 23, a second gear 24, a first rack 25, a second rack 26, a first guide rail 27, a second guide rail 28, a first rotating rod 29 and a second rotating rod 30, the inner surface of the top of the box body 1 is respectively connected with the first guide rail 27 and the second guide rail 28, the first rack 25 and the second rack 26 are respectively arranged in the first guide rail 27 and the second guide rail 28 in a sliding way, the first gear 23 is meshed with the first rack 25, the first rotating rod 29 penetrates through the first gear 23, the worm wheel 22 is sleeved at the first end of the first rotating rod 29 penetrating through the first gear 23, the second end of the first rotating rod 29 penetrating through the first gear 23 is rotatably connected with the rear side surface of the box body 1, the worm 21 is meshed with the worm wheel 22, the worm 21 rotatably penetrates through the top of the box body 1, the first gear 23 is further meshed with the second gear 24, the second gear 24 penetrates through the second gear 30, one end of the second rotating rod 30, which is far away from the second gear 24, is rotatably connected with the rear side surface of the box body 1, the second gear 24 is also meshed with the second rack 26, and the bottoms of the first rack 25 and the second rack 26 are detachably connected with the first spring dynamometer 3. When the worm 21 is rotated, the worm 21 drives the worm wheel 22 to rotate, the worm wheel 22 drives the first rotating rod 29 to rotate, the first rotating rod 29 drives the first gear 23 to rotate, the first gear 23 drives the second gear 24 engaged with the first gear 23 to rotate, when the first gear 23 and the second gear 24 rotate simultaneously, the first rack 25 and the second rack 26 are respectively driven to lift simultaneously, the first rack 25 and the second rack 26 which lift simultaneously drive the two first spring dynamometers 3 to lift simultaneously, the transmission of the worm 21 and the worm wheel 22 has self-locking performance, and when the worm 21 stops rotating, the two first spring dynamometers 3 can be simultaneously fixed to a certain same height. When the buoyancy needs to be demonstrated and the density of liquid is related, the two first spring dynamometer 3 can drive the two same demonstration blocks 4 to be immersed into the two test cups 5 filled with liquid with different densities respectively by rotating the worm 21, when the rotation of the worm 21 is stopped, the two first spring dynamometer 3 can be fixed to the same height, so that the volumes of the two demonstration blocks 4 immersed into the two different liquids are the same, and at the moment, the buoyancy and the density of the liquid can be obviously observed to be related by observing different readings of the two first spring dynamometer 3. Through the design, when the demonstration buoyancy is related to the liquid density, comparison can be carried out simultaneously, and the same object does not need to be placed into the liquids with different densities in sequence for comparison.

One end of the worm 21 penetrating through the top of the box body 1 is connected with a rotating rod 31, and the worm 21 can be easily rotated by rotating the rotating rod 31. First rack 25 and second rack 26 bottom all are connected with first couple 6, first spring dynamometer 3 articulates on first couple 6, setting up of first couple 6 has realized that two first spring dynamometers 3 can dismantle with first rack 25 and second rack 26 respectively and be connected, when need not demonstrate the buoyancy experiment, can pull down two first spring dynamometers 3 at any time, prevent that two first spring dynamometer 3 from appearing the inaccurate problem of dynamometry because of hanging for a long time and appearing.

The first spring force gauge 3 and the demo block 4 are connected by a string. The demonstration block 4 is provided with scale marks 7. The graduation marks 7 comprise a quarter graduation mark, a half graduation mark and a three quarter graduation mark. The demonstration block 4 is a regular cube structure, the volume, the mass and the density are all measured in advance, the density of the demonstration block 4 is large and cannot float in conventional liquid, the density of the liquid filled in the test cup 5 is also measured in advance, when the demonstration block 4 is immersed in the liquid and reaches a quarter scale mark, a half scale mark and a three-quarter scale mark respectively, the reading of the first spring dynamometer 3 under the corresponding scale is recorded, the first spring dynamometer 3 is used for hanging the reading of the demonstration block 4 which is not immersed in the liquid and subtracting the reading under the corresponding scale mark after the liquid is immersed, therefore, the buoyancy when the demonstration block 4 is immersed in the liquid and reaches the quarter scale mark, the half scale mark and the three-quarter scale mark respectively can be obtained, and then the buoyancy formula F is verified_{Floating body}＝ρ_{Liquid for treating urinary tract infection}V_{Row board}Whether g is correct or not, and the quarter scale line, the half scale line and the three-quarter scale line are set in order to determine the volume of water to be discharged under the corresponding scale line, i.e., V in the buoyancy formula_{Row board}And three scales can be used for carrying out three times of verification so as to ensure the accuracy of verification. Meanwhile, in the buoyancy demonstration, the demonstration block 4 can be completely immersed in the liquid of the test cup 5, when the demonstration block 4 is completely immersed in the liquid, the situation that the string cannot be immersed in the liquid and part of the string can be immersed in the liquid is avoided, and the string is small in size and can be ignoredDisregarding, so adopting the string to link first spring dynamometer 3 and demonstration piece 4, can confirm the size of buoyancy when demonstration piece 4 is fully soaked in the liquid more accurately.

All be connected with protrusion board 8 on the inner wall of side about box 1, protrusion board 8 bottom surface is connected with second couple 9, has hung on second couple 9 and has connect second spring dynamometer 10, is connected with graduated flask 11 on the second spring dynamometer 10, is equipped with drain pipe 12 on the test cup 5, and the one end that drain pipe 12 deviates from test cup 5 stretches into in the graduated flask 11. During buoyancy demonstration, liquid exceeding the height of the liquid outlet pipe 12 is filled in the test cup 5, the liquid exceeding the liquid outlet pipe 12 is continuously discharged into the measuring cup 11 through the liquid outlet pipe 12 until the liquid height in the test cup 5 is flush with the height of the outlet of the liquid outlet pipe 12, then the liquid in the measuring cup 11 is emptied, the demonstration block 4 is immersed in the liquid in the test cup 5, at the same time, the liquid in the test cup 5 flows into the measuring cup 11 through the liquid outlet pipe 12, when the demonstration block 4 is immersed in a quarter scale line, a half scale line and a three-quarter scale line respectively, the readings of the first spring dynamometer 3 and the second spring dynamometer 10 under the corresponding scale lines are recorded, then the reading of the first spring dynamometer 3 when the demonstration block 4 is hung and not immersed in the liquid is subtracted from the reading of the demonstration block 4 when the demonstration block 4 is immersed in the liquid, and the reading of the second spring dynamometer 10 when the demonstration block is hung and the measuring cup 11 is subtracted from the reading under the corresponding scale line The reading in the liquid process is compared, and the conclusion that whether the buoyancy force borne by the object immersed in the liquid is the same as the gravity of the liquid discharged by the object can be visually observed and verified.

The use process of the utility model is as follows: when the buoyancy required to be demonstrated is related to the density of liquid, the rotating rod 31 is rotated in the forward direction, the rotating rod 31 drives the worm 21 to rotate, the worm 21 drives the worm wheel 22 to rotate, the worm wheel 22 drives the first rotating rod 29 to rotate, the first rotating rod 29 drives the first gear 23 to rotate, the first gear 23 drives the second gear 24 engaged with the first gear to rotate, when the first gear 23 and the second gear 24 rotate simultaneously, the first rack 25 and the second rack 26 are respectively driven to descend simultaneously, and the descending first rack 25 and the descending second rack 26 respectively drive the two first spring measuring devices to respectively measure the buoyancyThe force meter 3 descends simultaneously, the two first spring dynamometer 3 respectively drive the two same demonstration blocks 4 to dip into the two test cups 5 filled with liquids with different densities simultaneously, the worm 21 and the worm wheel 22 are driven to have self-locking performance, the two first spring dynamometer 3 can be simultaneously fixed to a certain same height when the worm 21 stops rotating, the volumes of the two demonstration blocks 4 dipped into the two different liquids simultaneously are consistent, and the buoyancy and the liquid density can be obviously observed to be related by observing different readings of the two first spring dynamometer 3. When the buoyancy formula F needs to be verified_{Floating body}＝ρ_{Liquid for treating urinary tract infection}V_{Row board}g, recording the reading of the first spring dynamometer 3 under the corresponding scale when the demonstration block 4 is immersed in the liquid, and using the first spring dynamometer 3 to hang the reading when the demonstration block 4 is not immersed in the liquid and subtracting the reading under the corresponding scale mark after the demonstration block is immersed in the liquid, so that F when the demonstration block 4 is immersed in the liquid and reaches the quarter scale mark, the half scale mark and the three-quarter scale mark respectively can be obtained_{Floating body}Size and can know V under corresponding scale_{Row board}While, p_{Liquid for treating urinary tract infection}G is a constant, and the buoyancy formula F can be verified only by calculation_{Floating body}＝ρ_{Liquid for treating urinary tract infection}V_{Row board}Whether g is correct. When the buoyancy force borne by an object immersed in liquid is required to be verified to be consistent with the gravity of the liquid discharged by the object, firstly, liquid exceeding the height of the liquid outlet pipe 12 is filled in the test cup 5, then the liquid exceeding the liquid outlet pipe 12 is continuously discharged into the measuring cup 11 through the liquid outlet pipe 12 until the height of the liquid in the test cup 5 is flush with the height of the liquid outlet pipe 12, then the liquid in the measuring cup 11 is emptied, then the demonstration block 4 is immersed in the liquid in the test cup 5, at the moment, the liquid in the test cup 5 flows into the measuring cup 11 through the liquid outlet pipe 12, when the demonstration block 4 is respectively immersed in a quarter scale line, a half scale line and a three-quarter scale line, the readings of the first spring dynamometer 3 and the second spring dynamometer 10 under the corresponding to the scale lines are recorded, then the reading of the first spring dynamometer 3, which is hung on the demonstration block 4 and is not immersed in the liquid, is subtracted from the reading of the first spring dynamometer 3, which is hung on the demonstration block 4 and is not immersed in the liquid, and then the reading of the second spring dynamometer 10, hung on the corresponding to the scale lines The reading when the cup 11 is being measured minus the correspondingThe reading of the liquid flowing into the measuring cup 11 from the testing cup 5 under the scale mark is compared, so that whether the buoyancy of the object immersed in the liquid is the same as the gravity of the liquid discharged by the object can be visually observed and verified.

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 utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The buoyancy demonstration device for the physical teaching is characterized by comprising a box body (1), a lifting mechanism (2), first spring forcemeters (3), demonstration blocks (4) and a test cup (5), wherein a cavity is formed in the box body (1), the front side face of the box body (1) is in an open shape, the top of the box body (1) is connected with the lifting mechanism (2), the lifting mechanism (2) is connected with the two first spring forcemeters (3), the two first spring forcemeters (3) are both connected with the demonstration blocks (4), and the test cup (5) is arranged below the demonstration blocks (4);

the lifting mechanism (2) comprises a worm (21), a worm wheel (22), a first gear (23), a second gear (24), a first rack (25), a second rack (26), a first guide rail (27), a second guide rail (28), a first rotating rod (29) and a second rotating rod (30), wherein the inner surface of the top of the box body (1) is respectively connected with the first guide rail (27) and the second guide rail (28), the first guide rail (27) and the second guide rail (28) are internally provided with the first rack (25) and the second rack (26) in a sliding manner, the first rack (25) is meshed with the first gear (23), the first gear (23) is penetrated with the first rotating rod (29), the first rotating rod (29) penetrates through the first end of the first gear (23) and is sleeved with the worm wheel (22), and the first rotating rod (29) penetrates through the second end of the first gear (23) and is rotatably connected with the rear side face of the box body (1), the meshing has worm (21) on worm wheel (22), worm (21) rotationally runs through the top of box (1), first gear (23) still meshes with second gear (24) mutually, it has second dwang (30) to run through on second gear (24), second dwang (30) deviate from the one end of second gear (24) and the trailing flank rotatable coupling of box (1), second gear (24) still meshes with second rack (26) mutually, first rack (25) and second rack (26) bottom all can dismantle with first spring dynamometer (3) and be connected.

2. The buoyancy demonstration device for physics teaching according to claim 1, wherein one end of the worm (21) penetrating through the top of the box body (1) is connected with a rotating rod (31).

3. The buoyancy demonstration device for physics teaching of claim 1 characterized in that the first hook (6) is connected to the bottom of the first rack (25) and the second rack (26), and the first spring dynamometer (3) is hung on the first hook (6).

4. The buoyancy demonstration device for physical teaching according to claim 1, wherein the first spring dynamometer (3) and the demonstration block (4) are connected by a string.

5. The buoyancy demonstration device for physics teaching according to claim 1, characterized in that scale marks (7) are provided on the demonstration block (4).

6. The buoyancy demonstrating device for physics teaching according to claim 5, wherein the graduation marks (7) comprise a quarter graduation mark, a half graduation mark and a three quarter graduation mark.

7. The buoyancy demonstration device for physical teaching according to claim 1, wherein the inner walls of the left side and the right side of the box body (1) are connected with a protruding plate (8), the bottom surface of the protruding plate (8) is connected with a second hook (9), the second hook (9) is connected with a second spring dynamometer (10) in a hanging manner, the second spring dynamometer (10) is connected with a measuring cup (11), the test cup (5) is provided with a liquid outlet pipe (12), and one end of the liquid outlet pipe (12) deviating from the test cup (5) extends into the measuring cup (11).