Buoyancy demonstration device for junior high school physics teaching

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By designing an automated hoisting and lifting mechanism, the problems of cumbersome operation and low efficiency of existing buoyancy demonstration devices have been solved, achieving intuitive buoyancy demonstration and efficient teaching results.

CN122493725APending Publication Date: 2026-07-31YICHUN YIYANG SCHOOL

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: YICHUN YIYANG SCHOOL
Filing Date: 2026-06-13
Publication Date: 2026-07-31

AI Technical Summary

Technical Problem

Existing buoyancy demonstration devices rely on limited demonstration methods, making it difficult to guarantee the stability and repeatability of the experimental process. They also lack automated lifting and hoisting mechanisms, resulting in cumbersome and inefficient operation that negatively impacts teaching effectiveness.

Method used

A buoyancy demonstration device including a hoisting mechanism and a lifting mechanism was designed. The device utilizes a motor-driven grooved wheel and a bidirectional threaded rod to achieve automated control. Combined with an overflow cavity and scale measurement, it realizes an intuitive buoyancy demonstration process.

Benefits of technology

This improved the stability and repeatability of the experiment, enhanced students' intuitive understanding of the principle of buoyancy, and increased the flexibility and efficiency of teaching.

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Abstract

This invention discloses a buoyancy demonstration device for junior high school physics teaching, belonging to the technical field of buoyancy demonstration devices. It includes a base, a housing, a support, and a hoisting mechanism. The support is fixed to the top of the housing. The hoisting mechanism is mounted on the support and used for buoyancy demonstration teaching. The hoisting mechanism includes a first motor, a drive shaft, a grooved wheel, a hoisting rope, a counterweight, and the first motor is fixed to the end of the support away from the housing. This invention, through modular design, transforms complex physical principles into an intuitive and visual teaching process, effectively solving the problems of limited demonstration methods and difficulty in student understanding in traditional teaching. Its core hoisting mechanism, in conjunction with the overflow cavity, can accurately demonstrate Archimedes' principle. Through the hoisting of the counterweight and the overflow of water, students can directly observe the relationship between the volume of liquid displaced by an object and the buoyancy force, strengthening their understanding of the core formula "F_buoyancy = G_displaced".

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Description

Technical Field

[0001] This invention belongs to the technical field of buoyancy demonstration devices, specifically a buoyancy demonstration device for junior high school physics teaching. Background Technology

[0002] Buoyancy is an important topic in junior high school physics. Its core principle is Archimedes' principle, which states that an object immersed in a liquid experiences an upward buoyant force. The magnitude of the buoyant force is equal to the weight of the liquid displaced by the object. The expression is F_buoyancy = G_displaced = ρ_liquid * g * V_displaced. In physics teaching practice, it is crucial to help students understand this abstract concept through intuitive demonstration experiments. Traditional demonstration methods usually use basic equipment such as overflow cups and spring balances. The magnitude of the buoyant force is calculated by measuring the difference between the weight of the object in air and its apparent weight after immersion in the liquid. The overflowing liquid is then collected to verify the quantitative relationship between the volume of displaced liquid and the buoyant force.

[0003] However, existing buoyancy demonstration devices generally suffer from the following technical problems: First, the demonstration methods are limited, relying heavily on manual operation by teachers, making it difficult to guarantee the stability and repeatability of the experimental process. Students' observation angles are also limited, resulting in a less intuitive understanding of the key variable of "the volume of liquid displaced by the object." Second, existing devices have low functional integration, lacking automated lifting and hoisting mechanisms. Adjusting the demonstration height in different teaching scenarios is cumbersome for teachers, and the hoisting ropes are prone to loosening or tangling during deployment and retraction, affecting experimental accuracy. Third, post-experiment drainage and cleaning often require manual emptying, which is inefficient and detrimental to the effective use of class time. Therefore, there is an urgent need for a buoyancy teaching device with a reasonable structure, convenient operation, and intuitive demonstration effects to improve the teaching quality of physics classrooms and students' learning experience. Summary of the Invention

[0004] The purpose of this invention is to provide a buoyancy demonstration device for junior high school physics teaching, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a buoyancy demonstration device for junior high school physics teaching, comprising a base, a box, a bracket, and a hoisting mechanism;

[0006] The bracket is fixed to the top of the box;

[0007] The hoisting mechanism is mounted on the support frame and is used for buoyancy demonstration and teaching.

[0008] The hoisting mechanism includes a first motor, a drive shaft, a grooved wheel, a hoisting rope, a counterweight, and a counterweight block. The first motor is fixed to the end of the bracket away from the housing, and the drive shaft is fixed to the output end of the first motor. Meanwhile, the grooved wheel is fixed to the end of the drive shaft away from the first motor. One end of the hoisting rope is fixed to the grooved wheel and the hoisting rope is wound inside the grooved wheel. The counterweight block is fixed to the end of the hoisting rope away from the grooved wheel.

[0009] The box is fixedly connected to a side plate, and a water cavity and an overflow cavity are respectively provided on both sides of the side plate. The side plate is also provided with a scale for calculating the volume of overflow water.

[0010] As a further preferred embodiment of this technical solution: the height of the side plate is lower than the height of the box body, so that water can overflow into the overflow cavity;

[0011] As a further preferred embodiment of this technical solution: the bottom of the base is provided with a sliding groove, and a lifting mechanism is installed in the sliding groove for adjusting the height of the box. The lifting mechanism includes a second motor, a bidirectional threaded rod, a threaded block, and a support connecting rod.

[0012] The second motor is fixed in the slide groove, and the bidirectional threaded rod is fixed in the output end of the second motor. The end of the bidirectional threaded rod away from the second motor is rotatably connected to the slide groove. The threaded block is threaded through and connected to the bidirectional threaded rod. At the same time, the threaded block is slidably connected in the slide groove. The support rod is hinged to the threaded block. At the same time, the end of the support rod away from the threaded block is hinged to the bottom of the box.

[0013] As a further preferred embodiment of this technical solution: a telescopic column is fixedly connected to the base, and the end of the telescopic column away from the base is fixedly connected to the bottom of the box body, which is used to limit and guide the lifting and lowering of the box body;

[0014] As a further preferred embodiment of this technical solution: a top plate is fixedly connected to one end of the bracket away from the box body, a telescopic rod is fixedly connected to the top plate, and an arc-shaped grab is fixedly connected to one end of the telescopic rod away from the top plate. The arc-shaped grab is rotatably connected to the surface of the hoisting rope to stabilize the hoisting rope. The return spring is sleeved on the telescopic rod, and the two ends of the return spring are respectively fixed to the top plate and the arc-shaped grab.

[0015] As a further preferred embodiment of this technical solution: the bottom of the base is provided with casters for moving the device, and four sets of casters are provided.

[0016] As a further preferred embodiment of this technical solution: a drain pipe for drainage is fixedly connected through one side of the box, and a solenoid valve for controlling the water flow is provided on the drain pipe.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. In this invention, through modular design, complex physical principles are transformed into an intuitive and visual teaching process, effectively solving the problems of single demonstration methods and difficulty in student understanding in traditional teaching. Its core hoisting mechanism, in conjunction with the overflow cavity, can accurately demonstrate Archimedes' principle. Through the hoisting of the counterweight and the overflow of water, students can directly observe the relationship between the volume of liquid displaced by an object and the buoyancy, strengthening their understanding of the core formula "F_buoyancy = G_displaced".

[0019] 2. In this invention, the height of the box can be flexibly adjusted through the lifting mechanism of the device, and with the universal wheels, the movement and positioning of the equipment is more convenient, adapting to the needs of different teaching scenarios and improving the flexibility of teaching and the practicality of the equipment. Attached Figure Description

[0020] Figure 1 This is a front view of a buoyancy demonstration device for junior high school physics teaching according to the present invention;

[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a partial structural schematic diagram of a buoyancy demonstration device for junior high school physics teaching according to the present invention;

[0023] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0024] Figure 5 This is a side view of a buoyancy demonstration device for junior high school physics teaching according to the present invention.

[0025] Legend: 1. Base; 2. Box; 3. Bracket; 4. Lifting mechanism; 41. First motor; 42. Drive shaft; 43. Grooved wheel; 44. Lifting rope; 45. Counterweight; 5. Side plate; 6. Scale; 7. Water cavity; 8. Overflow cavity; 9. Slide groove; 10. Lifting mechanism; 1011. Second motor; 1012. Bidirectional threaded rod; 1013. Threaded block; 1014. Support connecting rod; 11. Telescopic column; 12. Top plate; 13. Telescopic rod; 14. Return spring; 15. Arc-shaped grab; 16. Universal wheel; 17. Drain pipe; 18. Solenoid valve. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example

[0028] Please see Figures 1-5 As shown, the present invention provides a technical solution: a buoyancy demonstration device for junior high school physics teaching, including a base 1, a box 2, a bracket 3, and a hoisting mechanism 4;

[0029] The bracket 3 is fixed to the top of the housing 2;

[0030] The hoisting mechanism 4 is installed on the bracket 3 and is used for buoyancy demonstration and teaching.

[0031] The hoisting mechanism 4 includes a first motor 41, a drive shaft 42, a grooved wheel 43, a hoisting rope 44, and a counterweight 45. The first motor 41 is fixed to the end of the bracket 3 away from the housing 2, and the drive shaft 42 is fixed to the output end of the first motor 41. Meanwhile, the grooved wheel 43 is fixed to the end of the drive shaft 42 away from the first motor 41. One end of the hoisting rope 44 is fixed to the grooved wheel 43, and the hoisting rope 44 is wound inside the grooved wheel 43. The counterweight 45 is fixed to the end of the hoisting rope 44 away from the grooved wheel 43.

[0032] A side plate 5 is fixedly connected inside the box 2. Water chambers 7 and overflow chambers 8 are respectively provided on both sides of the side plate 5. At the same time, the side plate 5 is provided with a scale 6 for calculating the volume of overflow water.

[0033] Furthermore, the interior of the box 2 is equipped with a side plate 5, which divides the internal space into a water chamber 7 and an overflow chamber 8. The side plate 5 is equipped with a scale 6, which can be used to intuitively read and calculate the volume of overflowing water, thereby verifying Archimedes' principle.

[0034] In this embodiment, specifically: the height of the side plate 5 is lower than the height of the box body 2, so that water overflows into the overflow cavity 8.

[0035] Furthermore, one side of the front of the box 2 is white and transparent, which makes it easier for personnel to visually observe the rising water level in the water chamber 7.

[0036] In this embodiment, specifically: the bottom of the base 1 is provided with a sliding groove 9, and a lifting mechanism 10 is installed in the sliding groove 9 to adjust the height of the box 2. The lifting mechanism 10 includes a second motor 1011, a bidirectional threaded rod 1012, a threaded block 1013, and a support connecting rod 1014.

[0037] The second motor 1011 is fixedly connected to the slide groove 9, and the bidirectional threaded rod 1012 is fixedly connected to the output end of the second motor 1011. The end of the bidirectional threaded rod 1012 away from the second motor 1011 is rotatably connected to the slide groove 9. The threaded block 1013 is threadedly connected to the bidirectional threaded rod 1012, and the threaded block 1013 is slidably connected to the slide groove 9. The support rod 1014 is hinged to the threaded block 1013, and the end of the support rod 1014 away from the threaded block 1013 is hinged to the bottom of the housing 2.

[0038] Furthermore, the threaded block 1013 is provided in two sets. The two sets of threaded blocks 1013 are respectively installed on the left and right turns of the bidirectional threaded rod 1012. Then, the relative or opposite movement of the two sets of threaded blocks 1013 drives the support connecting rod 1014 to rotate, thereby driving the housing 2 to rise and fall.

[0039] In this embodiment, specifically: a telescopic column 11 is fixedly connected to the base 1, and the end of the telescopic column 11 away from the base 1 is fixedly connected to the bottom of the box 2, which is used to limit and guide the lifting and lowering of the box 2.

[0040] Further: There are four sets of telescopic columns 11, which are evenly distributed on the base 1 and the box 2.

[0041] In this embodiment, specifically: a top plate 12 is fixedly connected to one end of the bracket 3 away from the box 2, a telescopic rod 13 is fixedly connected to the top plate 12, and an arc-shaped grab 15 is fixedly connected to one end of the telescopic rod 13 away from the top plate 12. The arc-shaped grab 15 is rotatably connected to the surface of the hoisting rope 44 to stabilize the hoisting rope 44. A return spring 14 is sleeved on the telescopic rod 13, and both ends of the return spring 14 are fixedly connected to the top plate 12 and the arc-shaped grab 15 respectively.

[0042] Furthermore, the elastic force of the return spring 14 keeps the arc-shaped grab 15 pressing the hoisting rope 44 tightly. This not only provides a stable guide for the hoisting rope 44 to be raised and lowered, but also fixes the hoisting rope 44 by friction after the counterweight 45 is lifted, preventing it from loosening due to its own weight or vibration, and ensuring the accuracy of the starting state of the demonstration.

[0043] In this embodiment, specifically: the bottom of the base 1 is provided with casters 16 for moving the device, and there are four sets of casters 16.

[0044] Furthermore, the caster wheel 16 is equipped with a braking component, which can bring the caster wheel 16 to a stop when the device is not moving.

[0045] In this embodiment, specifically: a drain pipe 17 for draining water is fixedly connected through one side of the box 2, and a solenoid valve 18 for controlling the water flow is provided on the drain pipe 17.

[0046] Furthermore, by controlling the opening and closing of the solenoid valve 18, the drainage process can be controlled conveniently and quickly without the need for manual emptying, simplifying the cleanup work after the experiment and improving teaching efficiency.

[0047] Working principle or structural principle: By starting the second motor 1011, the bidirectional threaded rod 1012 is driven to rotate, which in turn moves the threaded block 1013 along its axis. This, in turn, through the hinged transmission of the support connecting rod 1014, smoothly raises and lowers the tank 2. During this process, the telescopic column 11 provides limiting guidance to ensure stability, thereby adjusting the water level inside the tank to a suitable demonstration height. Subsequently, the first motor 41 is started, and its output drive shaft 42 drives the grooved wheel 43 to rotate, unwinding and rewinding the hoisting rope 44 wound around it to control the vertical movement of the counterweight 45. When the counterweight 45 is slowly lowered... When the device is placed and gradually immersed in water, it will be affected by the buoyancy of the water, which will reduce the tension of the suspension rope 44. At the same time, the water displaced by the counterweight will overflow from the top of the side plate 5 into the overflow chamber 8. The volume of water discharged can be accurately measured by observing the scale 6, thus visually verifying Archimedes' principle. During this process, the return spring 14 and the arc-shaped grab 15 work together to ensure that the suspension rope 44 can be stably and orderly arranged during the raising and lowering, preventing it from loosening or tangling. After the demonstration, simply open the solenoid valve 18, and the water in the box will be smoothly discharged through the drain pipe 17, preparing for the next experiment.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A buoyancy demonstration device for junior high school physics teaching, characterized in that, Includes base (1), box (2), bracket (3), and hoisting mechanism (4); The bracket (3) is fixed to the top of the box (2); The hoisting mechanism (4) is installed on the bracket (3) and is used for buoyancy demonstration teaching; The hoisting mechanism (4) includes a first motor (41), a drive shaft (42), a grooved wheel (43), a hoisting rope (44), a counterweight (45), and a counterweight (45). The first motor (41) is fixed to one end of the bracket (3) away from the box (2), and the drive shaft (42) is fixed to the output end of the first motor (41). At the same time, the grooved wheel (43) is fixed to one end of the drive shaft (42) away from the first motor (41). One end of the hoisting rope (44) is fixed to the grooved wheel (43), and the hoisting rope (44) is wound inside the grooved wheel (43). The counterweight (45) is fixed to one end of the hoisting rope (44) away from the grooved wheel (43). The box (2) is fixedly connected to a side plate (5). The two sides of the side plate (5) are respectively provided with a water cavity (7) and an overflow cavity (8). At the same time, the side plate (5) is provided with a scale (6) for calculating the volume of overflow water.

2. The buoyancy demonstration device for junior high school physics teaching according to claim 1, characterized in that: The height of the side plate (5) is lower than the height of the box body (2) so that water can overflow into the overflow cavity (8).

3. The buoyancy demonstration device for junior high school physics teaching according to claim 2, characterized in that: The bottom of the base (1) is provided with a slide groove (9), and a lifting mechanism (10) is installed in the slide groove (9) for adjusting the height of the box (2). The lifting mechanism (10) includes a second motor (1011), a two-way threaded rod (1012), a threaded block (1013), and a support connecting rod (1014). The second motor (1011) is fixed in the slide groove (9), and the bidirectional threaded rod (1012) is fixed on the output end of the second motor (1011). The end of the bidirectional threaded rod (1012) away from the second motor (1011) is rotatably connected to the slide groove (9). The threaded block (1013) is threaded through and connected to the bidirectional threaded rod (1012). The threaded block (1013) is slidably connected in the slide groove (9). The support rod (1014) is hinged to the threaded block (1013). The end of the support rod (1014) away from the threaded block (1013) is hinged to the bottom of the box (2).

4. The buoyancy demonstration device for junior high school physics teaching according to claim 3, characterized in that: A telescopic column (11) is fixedly connected to the base (1), and one end of the telescopic column (11) away from the base (1) is fixedly connected to the bottom of the box (2) for limiting and guiding the lifting and lowering of the box (2).

5. A buoyancy demonstration device for junior high school physics teaching according to claim 4, characterized in that: The bracket (3) is fixed to a top plate (12) at one end away from the box (2). A telescopic rod (13) is fixed to the top plate (12), and an arc-shaped grab (15) is fixed to one end of the telescopic rod (13) away from the top plate (12). The arc-shaped grab (15) is rotatably connected to the surface of the hoisting rope (44) to stabilize the hoisting rope (44). The return spring (14) is sleeved on the telescopic rod (13), and the two ends of the return spring (14) are fixed to the top plate (12) and the arc-shaped grab (15) respectively.

6. A buoyancy demonstration device for junior high school physics teaching according to claim 5, characterized in that: The base (1) is provided with casters (16) at the bottom for moving the device, and there are four sets of casters (16).

7. A buoyancy demonstration device for junior high school physics teaching according to claim 6, characterized in that: A drain pipe (17) for draining water is fixedly connected through one side of the box (2), and a solenoid valve (18) for controlling the water flow is provided on the drain pipe (17).