Buoyancy science popularization demonstration device

Abstract

The invention relates to the technical field of buoyancy demonstration, and discloses a buoyancy science popularization demonstration device which solves the problem that at present, teenagers cannot intuitively understand buoyancy, so that the science popularization effect is influenced, the buoyancy science popularization demonstration device comprises a water tank, a water drainage pipe is fixedly connected to the position, close to the bottom, of the outer side of the water tank, and a valve is arranged on the water drainage pipe; a buoyancy demonstration mechanism and a mounting mechanism are arranged in the water tank, the buoyancy demonstration mechanism comprises a U-shaped round rod fixed to the top of the water tank, the outer side of the U-shaped round rod is symmetrically and movably sleeved with a front plate and a rear plate, a supporting shaft is rotationally connected between the front plate and the rear plate, the middle of the outer side of the supporting shaft is fixedly sleeved with a mounting plate, and a plastic floating bottle is arranged at the bottom of the mounting plate; and the plastic floating bottle is horizontally arranged in the water tank. Water can be conveniently injected into the plastic floating bottle, the gravity of the plastic floating bottle is larger than buoyancy, then the plastic floating bottle can be conveniently immersed in the water, and therefore teenagers can visually know the buoyancy conveniently, and the science popularization effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of buoyancy demonstration, and in particular relates to a buoyancy science popularization demonstration device. Background Art

[0002] Buoyancy refers to the vertical upward force exerted on an object immersed in a fluid. This force is opposite to the direction of gravity and is the reason why objects can be suspended or float on the surface of the liquid. The buoyancy comes from the pressure difference between the upper and lower surfaces of the object. When an object is immersed in liquid, the pressure on its lower surface is greater than the pressure on the upper surface, thereby generating an upward resultant force, namely buoyancy.

[0003] At present, when popularizing buoyancy knowledge to teenagers, it can only be done through books or PPTs, without any real demonstration, which makes it impossible for teenagers to understand buoyancy intuitively, affecting the effect of popularization. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a buoyancy science demonstration device, which effectively solves the problem that young people cannot intuitively understand buoyancy and thus affects the science popularization effect.

[0005] To achieve the above object, the present invention provides the following technical solutions: a buoyancy science demonstration device, comprising a water tank, a drain pipe is fixedly connected to the outside of the water tank near the bottom, a valve is provided on the drain pipe, and a buoyancy demonstration mechanism and a mounting mechanism are provided inside the water tank;

[0006] The buoyancy demonstration mechanism comprises a U-shaped round rod fixed to the top of the water tank, a front plate and a rear plate are symmetrically and movably sleeved on the outer side of the U-shaped round rod, a support shaft is rotatably connected between the front plate and the rear plate, a mounting plate is fixedly sleeved on the middle part of the outer side of the support shaft, a plastic floating bottle is arranged horizontally inside the water tank, a bottle cap is arranged on the plastic floating bottle, a sleeve plate is fixedly sleeved on the middle part of the outer side of the U-shaped round rod, the sleeve plate is fixed to the top of the water tank, a water pump is fixedly connected to the sleeve plate, a water pump is fixedly connected to the water tank, a water delivery pipe is fixedly connected to the water pump, the bottom end of the water delivery pipe passes through the sleeve plate and is fixedly connected to a hose, one end of the hose away from the water delivery pipe is fixedly connected to a hard pipe, the outer side of the plastic floating bottle is fixedly connected to a connecting pipe, and the hard pipe is sleeved in the connecting pipe;

[0007] The mounting mechanism comprises a fixing assembly and a connecting unit. The fixing assembly is used to fix the mounting plate to the plastic floating bottle, and the connecting unit is used to connect the hard pipe to the connecting pipe.

[0008] Preferably, an outer ring is fixedly sleeved on the outer side of the hard tube, and a sealing ring is fixedly connected to a side of the outer ring close to the plastic float bottle, and the sealing ring fits the connecting pipe.

[0009] Preferably, a support plate is fixedly mounted on the outer side of the front plate, a drive shaft is rotatably connected to the support plate, a drive gear is fixedly mounted on the outer side of the drive shaft, a driven gear is fixedly mounted on the outer side of the support shaft, and the driven gear is meshingly connected with the drive gear.

[0010] Preferably, one end of the drive shaft passes through the front plate and is fixedly connected to the mounting frame, and the drive shaft is rotatably connected to the front plate, a movable column is movably sleeved inside the mounting frame, one end of the movable column extends to the outside of the mounting frame and is fixedly connected to a turntable, a handle is fixedly connected to the side of the turntable away from the mounting frame, a return spring is fixedly connected between the turntable and the mounting frame, and the return spring is sleeved on the outside of the movable column.

[0011] Preferably, a limiting groove is provided on the outer side of the installation frame, a limiting block is slidably connected in the limiting groove, and the limiting block is fixed to the outer side of the movable column.

[0012] Preferably, a positioning column and an abutment column are fixedly connected to the side of the front plate away from the supporting shaft, an abutment block located between the positioning column and the abutment column is fixedly connected to the outer side of the turntable, and the abutment block abuts against the abutment column, a positioning rod is fixedly connected to the side of the turntable close to the front plate, a positioning cylinder and an insertion cylinder are fixedly connected to the side of the front plate close to the turntable, the inner diameter values ​​of the positioning cylinder and the insertion cylinder are equal to the outer diameter value of the positioning rod, and the positioning rod is inserted into the positioning cylinder.

[0013] Preferably, the fixing assembly includes two bent rods symmetrically fixed to the outer side of the mounting plate, a lifting plate is movably sleeved between the two bent rods, a connecting column is fixedly connected to the outer side of the lifting plate, a plug plate is fixedly sleeved to the outer side of the connecting column, an avoidance groove is provided on the top of the mounting plate, a positioning groove is provided on the outer side of the mounting plate, a positioning plate is fixedly connected to the top of the plastic float bottle, the positioning plate is inserted into the positioning groove, a slot is provided on the top of the positioning plate, and the plug plate passes through the avoidance groove and is inserted into the slot.

[0014] Preferably, the top of the mounting plate is rotatably connected to a screw, the top of the screw is fixedly connected to a handwheel, the outer thread of the screw is sleeved with a screw sleeve, the end of the connecting column away from the lifting plate is fixed to the outside of the screw sleeve, and a top plate is fixedly connected between the ends of the two bent rods away from the mounting plate, and the screw passes through the top plate and is rotatably connected to the top plate.

[0015] Preferably, the connecting unit includes a slide plate located directly above the outer ring, a connecting plate is fixedly connected between the slide plate and the outer ring, the slide plate is movably sleeved on the outer sides of the two bent rods, the top of the slide plate is rotatably connected to a movable rod, and the top end of the movable rod is rotatably connected to the outer side of the lifting plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention, through the cooperation among the handle, the turntable, the movable column, the return spring, the limit block, the limit groove, the installation frame, the drive shaft, the drive gear, the driven gear, the support shaft and the installation plate, when the abutment block abuts against the abutment column, it is convenient to insert the positioning rod into the positioning cylinder, so that the plastic float bottle can be horizontally located in the water tank, and through the cooperation among the mounting plate, the support shaft, the rear plate, the front plate and the U-shaped round rod, when water is injected into the water tank, the plastic float bottle is easy to float due to the buoyancy, and through the cooperation between the water pump and the water pump pipe, it is convenient to extract water from the water tank, so that the plastic float bottle can drop as the water level drops, and through the cooperation between the water pipe and the hose, it is convenient to inject water into the plastic float bottle, so that the gravity of the plastic float bottle is greater than the buoyancy, and then the plastic float bottle is easy to be immersed in water, so that it is convenient for young people to intuitively understand buoyancy and improve the effect of popular science.

[0018] 2. The invention facilitates the placement of the plastic float bottle at the bottom of the mounting plate through the cooperation between the positioning plate and the positioning groove, and facilitates the insertion of the plug plate through the avoidance groove and into the slot through the cooperation between the hand wheel, the screw, the screw sleeve, the connecting column, the lifting plate and the bending rod, so that the positioning plate can be fixed to the mounting plate, thereby facilitating the installation of the plastic float bottle.

[0019] 3. The invention facilitates the connection plate to drive the outer ring to move through the coordination among the hand wheel, screw rod, screw sleeve, connecting column, lifting plate, bent rod, movable rod and slide plate, so that the hard tube can be inserted into the connecting pipe, so that the sealing ring fits with the connecting pipe, and the hard tube is connected and fixed to the plastic float bottle, thereby facilitating the injection of water into the plastic float bottle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0021] In the attached picture:

[0022] Figure 1 This is a schematic diagram of the structure of the buoyancy science demonstration device of the present invention;

[0023] Figure 2 This is a schematic diagram of the buoyancy demonstration mechanism structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the plastic bottle of the present invention;

[0025] Figure 4 This is a schematic diagram of the front plate structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the installation frame structure of the present invention;

[0027] Figure 6 It is a schematic diagram of the structure of the installation mechanism of the present invention;

[0028] Figure 7 It is a schematic diagram of the exploded structure of the mounting plate of the present invention.

[0029] In the figure: 1, water tank; 2, buoyancy demonstration mechanism; 201, U-shaped round rod; 202, sleeve plate; 203, water pump; 204, water pipe; 205, front plate; 206, water suction pipe; 207, hose; 208, plastic float bottle; 209, mounting plate; 2010, support shaft; 2011, rear plate; 2012, outer ring; 2013, hard pipe; 2014, sealing ring; 2015, connecting pipe; 2016, bottle cap; 2017, positioning column; 2018, abutment column; 2019, mounting frame; 2020, support plate; 2021, drive shaft; 2022, drive gear; 2023, driven gear; 2024, reset Spring; 2025, abutment block; 2026, handle; 2027, turntable; 2028, movable column; 2029, limit block; 2030, limit groove; 2031, positioning tube; 2032, insert tube; 2033, positioning rod; 3, installation mechanism; 301, bending rod; 302, lifting plate; 303, slide plate; 304, connecting plate; 305, positioning plate; 306, screw sleeve; 307, screw rod; 308, top plate; 309, hand wheel; 3010, insert plate; 3011, connecting column; 3012, movable rod; 3013, slot; 3014, avoidance groove; 3015, positioning groove; 4, valve; 5, drain pipe. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] Embodiment 1, by Figure 1-Figure 7 The present invention relates to a buoyancy science demonstration device, comprising a water tank 1, a drain pipe 5 is fixedly connected to the outer side of the water tank 1 near the bottom, a valve 4 is provided on the drain pipe 5, and a buoyancy demonstration mechanism 2 and a mounting mechanism 3 are provided inside the water tank 1.

[0032] Embodiment 2, on the basis of embodiment 1, the buoyancy demonstration mechanism 2 comprises a U-shaped round rod 201 fixed to the top of the water tank 1, the outer side of the U-shaped round rod 201 is symmetrically and movably sleeved with a front plate 205 and a rear plate 2011, a support shaft 2010 is rotatably connected between the front plate 205 and the rear plate 2011, a mounting plate 209 is fixedly sleeved at the middle part of the outer side of the support shaft 2010, a plastic floating bottle 208 is provided at the bottom of the mounting plate 209, the plastic floating bottle 208 is horizontally arranged inside the water tank 1, a bottle cap 2016 is provided on the plastic floating bottle 208, a sleeve plate 202 is fixedly sleeved at the middle part of the outer side of the U-shaped round rod 201, the sleeve plate 202 is fixedly connected to the top of the water tank 1, a water pump 203 is fixedly connected to the sleeve plate 202, and a water pump 203 is fixedly connected to the water tank 1 The water pump 206 is fixedly connected to the water pipe 204 on the water pump 203. The bottom end of the water pipe 204 passes through the sleeve plate 202 and is fixedly connected to a hose 207. The end of the hose 207 away from the water pipe 204 is fixedly connected to a hard pipe 2013. The outer side of the plastic float bottle 208 is fixedly connected to a connecting pipe 2015. The hard pipe 2013 is sleeved in the connecting pipe 2015. The mounting mechanism 3 includes a fixing component and a connecting unit. The fixing component is used to fix the mounting plate 209 and the plastic float bottle 208. The connecting unit is used to connect the hard pipe 2013 and the connecting pipe 2015. The outer side of the hard pipe 2013 is fixedly sleeved with an outer ring 2012. The side of the outer ring 2012 close to the plastic float bottle 208 is fixedly connected with a sealing ring 2014. The sealing ring 2014 and the connecting pipe 2015 are fixedly connected. 5, a support plate 2020 is fixedly installed on the outer side of the front plate 205, a driving shaft 2021 is rotatably connected to the support plate 2020, a driving gear 2022 is fixedly installed on the outer side of the driving shaft 2021, a driven gear 2023 is fixedly installed on the outer side of the support shaft 2010, the driven gear 2023 is meshed and connected with the driving gear 2022, one end of the driving shaft 2021 passes through the front plate 205 and is fixedly connected to the installation frame 2019, and the driving shaft 2021 is rotatably connected to the front plate 205, a movable column 2028 is movably sleeved inside the installation frame 2019, one end of the movable column 2028 extends to the outer side of the installation frame 2019 and is fixedly connected to a turntable 2027, and a side of the turntable 2027 away from the installation frame 2019 is fixedly connected to A return spring 2024 is fixedly connected between the handle 2026, the turntable 2027 and the installation frame 2019, and the return spring 2024 is sleeved on the outer side of the movable column 2028. A limiting groove 2030 is provided on the outer side of the installation frame 2019, and a limiting block 2029 is slidably connected in the limiting groove 2030. The limiting block 2029 is fixed to the outer side of the movable column 2028. A positioning column 2017 and an abutting column 2018 are fixedly connected to the side of the front plate 205 away from the support shaft 2010. An abutting block 2025 located between the positioning column 2017 and the abutting column 2018 is fixedly connected to the outer side of the turntable 2027, and the abutting block 2025 abuts against the abutting column 2018. A positioning rod 2033 is fixedly connected to the side of the turntable 2027 close to the front plate 205.A positioning tube 2031 and an inserting tube 2032 are fixedly connected to one side of the front plate 205 close to the rotating disk 2027. The inner diameters of the positioning tube 2031 and the inserting tube 2032 are equal to the outer diameter of the positioning rod 2033, and the positioning rod 2033 is inserted into the positioning tube 2031;

[0033] In the initial state, the abutment block 2025 abuts against the abutment column 2018, the positioning rod 2033 is inserted into the positioning cylinder 2031, and the plastic float bottle 208 is horizontally located inside the water tank 1. Then water is poured into the water tank 1. Since the gravity of the plastic float bottle 208 is less than its buoyancy, the plastic float bottle 208 floats as the water level rises. Then the water pump 203 is started to extract the water in the water tank 1 through the water extraction pipe 206. At the same time, the plastic float bottle 208 drops as the water level drops. Then the extracted water is injected into the plastic float bottle 208 through the water delivery pipe 204 and the hose 207, so that the weight of the plastic float bottle 208 increases. When the gravity of the plastic float bottle 208 is greater than its buoyancy, it is immersed in the water. In the whole process, young people can intuitively understand buoyancy and improve the effect of popular science. When the buoyancy demonstration is completed, first pull the handle 2026 to drive the turntable 2027 to move. At this time, the reset spring 20 24 is stretched, and drives the positioning rod 2033 to move until it disengages from the positioning cylinder 2031, and then rotates the handle 2026, drives the turntable 2027 to rotate, and drives the movable column 2028 to rotate, and drives the mounting frame 2019 to rotate under the cooperation between the limit groove 2030 and the limit block 2029, and then drives the driving shaft 2021 to rotate, because the driving gear 2022 is meshed and connected with the driven gear 2023, thereby driving the support shaft 2010 to rotate, and then drives the plastic float bottle 208 to rotate through the mounting plate 209 until the abutment block 2025 abuts against the positioning column 2017, and then makes the positioning rod 2033 inserted into the insertion cylinder 2032 under the action of the elastic force of the return spring 2024, so as to realize the fixation of the plastic float bottle 208 after rotation, and finally opens the bottle cap 2016, so that the water in the plastic float bottle 208 is discharged and flows into the water tank 1, so as to facilitate the next buoyancy demonstration.

[0034] Embodiment 3, on the basis of embodiment 1, the fixing assembly comprises two curved rods 301 symmetrically fixed to the outside of the mounting plate 209, a lifting plate 302 is movably sleeved between the two curved rods 301, a connecting column 3011 is fixedly connected to the outside of the lifting plate 302, a plug plate 3010 is fixedly sleeved to the outside of the connecting column 3011, an avoidance groove 3014 is provided on the top of the mounting plate 209, a positioning groove 3015 is provided on the outside of the mounting plate 209, a positioning plate 305 is fixedly connected to the top of the plastic float 208, the positioning plate 305 is inserted into the positioning groove 3015, and the positioning plate 305 is fixedly connected to the top of the plastic float 208. A slot 3013 is provided at the top of the positioning plate 305, and the plug plate 3010 passes through the avoidance groove 3014 and is inserted into the slot 3013. A screw rod 307 is rotatably connected to the top of the mounting plate 209, and a hand wheel 309 is fixedly connected to the top of the screw rod 307. A screw sleeve 306 is threadedly sleeved on the outer side of the screw rod 307. One end of the connecting column 3011 away from the lifting plate 302 is fixed to the outer side of the screw sleeve 306. A top plate 308 is fixedly connected between the ends of the two bent rods 301 away from the mounting plate 209, and the screw rod 307 passes through the top plate 308 and is rotatably connected to the top plate 308.

[0035] First, place the plastic float bottle 208 at the bottom of the mounting plate 209 so that the positioning plate 305 is inserted into the positioning groove 3015, then rotate the hand wheel 309 to drive the screw 307 to rotate, and drive the lifting plate 302 to slide downward along the two curved rods 301 through the screw sleeve 306 and the connecting column 3011, and drive the plug plate 3010 to descend and pass through the avoidance groove 3014 until it is inserted into the slot 3013, fix the positioning plate 305 to the mounting plate 209, and finally complete the installation of the plastic float bottle 208.

[0036] Embodiment 4, on the basis of embodiment 1, the connection unit includes a slide plate 303 located directly above the outer ring 2012, a connection plate 304 is fixedly connected between the slide plate 303 and the outer ring 2012, the slide plate 303 is movably sleeved on the outer sides of the two curved rods 301, the top of the slide plate 303 is rotatably connected to the movable rod 3012, and the top end of the movable rod 3012 is rotatably connected to the outer side of the lifting plate 302;

[0037] First, rotate the hand wheel 309 to drive the screw rod 307 to rotate, and drive the lifting plate 302 to slide downward along the two curved rods 301 through the screw sleeve 306 and the connecting column 3011, and drive the plug plate 3010 to descend, and at the same time drive the slide plate 303 to slide along the two curved rods 301 through the movable rod 3012, and then drive the outer ring 2012 to move horizontally through the connecting plate 304, and at the same time, the hard tube 2013 moves horizontally, when the bottom of the plug plate 3010 passes through the avoidance groove 3014 and extends into the slot 3013, the hard tube 2013 is inserted into the connecting pipe 2015, and when the plug plate 3010 fills the slot 3013, the sealing ring 2014 is fitted with the connecting pipe 2015, and the hard tube 2013 is connected and fixed to the plastic float bottle 208, and finally it is convenient to fill water into the plastic float bottle 208.

Claims

1. A buoyancy science demonstration device, comprising a water tank (1), characterized in that: A drainage pipe (5) is fixedly connected to the outside of the water tank (1) near the bottom, and a valve (4) is provided on the drainage pipe (5). A buoyancy demonstration mechanism (2) and a mounting mechanism (3) are provided inside the water tank (1); The buoyancy demonstration mechanism (2) comprises a U-shaped round rod (201) fixed to the top of the water tank (1); a front plate (205) and a rear plate (2011) are symmetrically and movably sleeved on the outer side of the U-shaped round rod (201); a support shaft (2010) is rotatably connected between the front plate (205) and the rear plate (2011); a mounting plate (209) is fixedly sleeved on the middle part of the outer side of the support shaft (2010); a plastic floating bottle (208) is provided at the bottom of the mounting plate (209); the plastic floating bottle (208) is horizontally arranged inside the water tank (1); a bottle cap (216) is provided on the plastic floating bottle (208); a support shaft (2010) is fixedly sleeved on the middle part of the outer side of the support shaft (2010); A sleeve plate (202) is provided, the sleeve plate (202) is fixed on the top of the water tank (1), a water pump (203) is fixedly connected to the sleeve plate (202), a water extraction pipe (206) is fixedly connected between the water pump (203) and the water tank (1), a water delivery pipe (204) is fixedly connected to the water pump (203), the bottom end of the water delivery pipe (204) passes through the sleeve plate (202) and is fixedly connected to a hose (207), one end of the hose (207) away from the water delivery pipe (204) is fixedly connected to a hard pipe (213), the outer side of the plastic float bottle (208) is fixedly connected to a connecting pipe (215), and the hard pipe (213) is sleeved in the connecting pipe (215); The mounting mechanism (3) comprises a fixing assembly and a connecting unit, wherein the fixing assembly is used to fix the mounting plate (209) to the plastic floating bottle (208), and the connecting unit is used to connect the hard pipe (2013) to the connecting pipe (2015).

2. A buoyancy science demonstration device according to claim 1, characterized in that: An outer ring (2012) is fixedly sleeved on the outer side of the hard tube (2013), and a sealing ring (2014) is fixedly connected to the side of the outer ring (2012) close to the plastic float bottle (208), and the sealing ring (2014) is fitted with the connecting pipe (2015).

3. A buoyancy science demonstration device according to claim 1, characterized in that: A support plate (2020) is fixedly mounted on the outer side of the front plate (205), a drive shaft (2021) is rotatably connected to the support plate (2020), a drive gear (2022) is fixedly mounted on the outer side of the drive shaft (2021), a driven gear (2023) is fixedly mounted on the outer side of the support shaft (2010), and the driven gear (2023) is meshingly connected with the drive gear (2022).

4. A buoyancy science demonstration device according to claim 3, characterized in that: One end of the drive shaft (2021) passes through the front plate (205) and is fixedly connected to the installation frame (2019), and the drive shaft (2021) is rotatably connected to the front plate (205), and the interior of the installation frame (2019) is movably sleeved with a movable column (2028), one end of the movable column (2028) extends to the outside of the installation frame (2019) and is fixedly connected to a turntable (2027), and a handle (2026) is fixedly connected to the side of the turntable (2027) away from the installation frame (2019), and a return spring (2024) is fixedly connected between the turntable (2027) and the installation frame (2019), and the return spring (2024) is sleeved on the outside of the movable column (2028).

5. A buoyancy science demonstration device according to claim 4, characterized in that: A limiting groove (2030) is provided on the outer side of the installation frame (2019), a limiting block (2029) is slidably connected in the limiting groove (2030), and the limiting block (2029) is fixed to the outer side of the movable column (2028).

6. A buoyancy science demonstration device according to claim 1, characterized in that: A positioning column (2017) and an abutment column (2018) are fixedly connected to the side of the front plate (205) away from the support shaft (2010); an abutment block (2025) located between the positioning column (2017) and the abutment column (2018) is fixedly connected to the outer side of the turntable (2027), and the abutment block (2025) abuts against the abutment column (2018); a positioning rod (2033) is fixedly connected to the side of the turntable (2027) close to the front plate (205); a positioning tube (2031) and an insertion tube (2032) are fixedly connected to the side of the front plate (205) close to the turntable (2027); the inner diameter values ​​of the positioning tube (2031) and the insertion tube (2032) are equal to the outer diameter value of the positioning rod (2033), and the positioning rod (2033) is inserted into the positioning tube (2031).

7. A buoyancy science demonstration device according to claim 1, characterized in that: The fixing assembly comprises two bent rods (301) symmetrically fixed to the outer side of the mounting plate (209); a lifting plate (302) is movably sleeved between the two bent rods (301); a connecting column (3011) is fixedly connected to the outer side of the lifting plate (302); a plug plate (3010) is fixedly sleeved to the outer side of the connecting column (3011); a avoidance groove (3014) is provided at the top of the mounting plate (209); a positioning groove (3015) is provided at the outer side of the mounting plate (209); a positioning plate (305) is fixedly connected to the top of the plastic floating bottle (208); the positioning plate (305) is inserted into the positioning groove (3015); a slot (3013) is provided at the top of the positioning plate (305); and the plug plate (3010) passes through the avoidance groove (3014) and is inserted into the slot (3013).

8. A buoyancy science demonstration device according to claim 1, characterized in that: The top of the mounting plate (209) is rotatably connected to a screw rod (307), the top of the screw rod (307) is fixedly connected to a hand wheel (309), the outer side of the screw rod (307) is threadedly sleeved with a screw sleeve (306), one end of the connecting column (3011) away from the lifting plate (302) is fixed to the outer side of the screw sleeve (306), a top plate (308) is fixedly connected between the ends of the two bent rods (301) away from the mounting plate (209), and the screw rod (307) passes through the top plate (308) and is rotatably connected to the top plate (308).

9. A buoyancy science demonstration device according to claim 1, characterized in that: The connection unit comprises a slide plate (303) located directly above the outer ring (2012); a connection plate (304) is fixedly connected between the slide plate (303) and the outer ring (2012); the slide plate (303) is movably sleeved on the outer sides of the two bent rods (301); the top of the slide plate (303) is rotatably connected to a movable rod (3012); and the top end of the movable rod (3012) is rotatably connected to the outer side of the lifting plate (302).

Images