CN207909387U

CN207909387U - A kind of buoyancy experiment equipment for physics teaching

Info

Publication number: CN207909387U
Application number: CN201721438886.3U
Authority: CN
Inventors: 苏畅
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-11-01
Filing date: 2017-11-01
Publication date: 2018-09-25
Anticipated expiration: 2027-11-01

Abstract

The utility model discloses a kind of buoyancy experiment equipment for physics teaching, including cup, weight, weight beam and lifting gear, lifting gear includes pedestal, supporting rack, first mounting rod and the second mounting rod, supporting rack bottom end is connected on pedestal, first mounting rod and the second mounting rod are arranged in parallel and respectively both ends are connected on supporting rack, it is provided with pulley on first mounting rod, it is provided with reel on second mounting rod, second mounting rod is hollow-core construction, wherein it is equipped with shaft, shaft one end is pierced by second mounting rod and is connected with crank handle, it is connected with connecting rope at the top of weight beam, the connecting rope other end is connected after bypassing pulley with the coil of wire of reel, it rotates crank handle and reel rotation is driven by shaft, to drive the weight of weight beam bottom end to enter or remove cup.The buoyancy experiment equipment of the utility model type is convenient and strength-saving, coordinates without other people, one can complete to test, and experimental result is also more acurrate.

Description

A kind of buoyancy experiment equipment for physics teaching

Technical field

It is more particularly to a kind of for physics teaching the utility model is related to junior physics field of experiment equipment Buoyancy experiment equipment.

Background technology

The law of buoyancy of object, also known as Archimedes' principle, according to Archimedes principle, be immersed in object in liquid by The size of upward buoyancy, buoyancy arranges gravity suffered by liquid equal to object, i.e. F floats=G liquid row=ρ liquid gV rows.Wherein V arranges table Show the volume for the liquid that object arranges, it is a very important law physically, this law compares in teaching Abstract and not intelligible, in order to sharpen understanding, teacher often makes various teaching aids, is discharged to calculate object The weight of liquid, teaching aid used generally comprises weight, beaker, water receiving container and weight beam etc., in actual mechanical process, Since used tool is not professional, error when measurement is larger, and visual also bad, teaching efficiency is poor, gives student's cognition Bring mistaken ideas.

Specifically, all it is to be hung weight beam lower end by hand-held weight beam in actual physics experimental courses Weight into the water, very inconvenient, and whole measurement process hand can shake, the registration of weight beam is unstable, becomes always Change, cause experimental result inaccurate, portable a weight beam will also read and record registration on one side, very inconvenient, need A kind of Special buoyancy experimental facilities is provided, above-mentioned technical problem is solved.

Utility model content

In view of the deficienciess of the prior art, the purpose of this utility model is to provide a kind of buoyancy for physics teaching Experimental facilities solves the easy shaking of portable weight beam in buoyancy experiment in the prior art, leads to weight beam registration It is unstable, the larger technical problem of experimental error.

To achieve the above object, the utility model provides following technical solution：A kind of buoyancy for physics teaching is real Test equipment, including cup, weight and weight beam, further include lifting gear, the lifting gear include pedestal, supporting rack, First mounting rod and the second mounting rod, support frame as described above bottom end are connected on pedestal, first mounting rod and the second mounting rod It is arranged in parallel and respectively both ends is connected on supporting rack, it is rotatable on first mounting rod to be provided with first pulley, Rotatable on second mounting rod to be provided with annular roll wheel, the reel includes the cam of both sides and intermediate line Volume, second mounting rod are hollow-core construction, wherein being equipped with shaft, described shaft one end is pierced by the second mounting rod and is connected with Crank handle, is connected with connecting rope at the top of the weight beam, and the connecting rope other end bypasses after first pulley and reel The coil of wire be connected, rotation crank handle by shaft drive reel rotation, to drive the weight of weight beam bottom end to enter Or remove cup.

First sleeve and ring-type first are additionally provided on second mounting rod as a further improvement of the utility model, The lateral wall of gear, the first sleeve is fixedly connected by fixed link with the first mounting rod, the first sleeve both ends difference It is connected with reel and first gear by rolling bearing, the reel other end passes through rolling bearing and the first mounting rod phase Even, the first gear other end is connected by rolling bearing and the first mounting rod；The interior edge of the reel and first gear Two opposite blocks are respectively arranged with, two opposite supports blocks, two to be connected with the second mounting rod are provided in the shaft It is provided in a rolling bearing and supports block is limited into the limiting plate moved therebetween；Further include third mounting rod, the third Rotatable second gear and third gear are provided on mounting rod, by being set between the second gear and third gear The second casing connection on third mounting rod, the second gear and first gear match transmission, on the third gear Double wedge uniformly continuous is distributed on the outer of its 1/4-1/2, is provided on the cam of the reel side and third gear phase The double wedge of cooperation.

First sleeve and ring-type first are additionally provided on second mounting rod as a further improvement of the utility model, The lateral wall of gear, the first sleeve is fixedly connected by fixed link with the first mounting rod, the first sleeve both ends difference It is connected with reel and first gear by rolling bearing, the reel other end passes through rolling bearing and the first mounting rod phase Even, the first gear other end is connected by rolling bearing and the first mounting rod；The interior edge of the reel is provided with along inverse The inclined double wedge of clockwise, the interior edge of the first gear are provided with inclined double wedge along clockwise direction, outside the shaft It is hinged on edge with matched first baffle of reel and is supported with matched second baffle of first gear, described first Block tilts clockwise with respect to shaft, passes through between first baffle and the close side and shaft outer of shaft The elastic strip of bending connects, and second baffle tilts counterclockwise with respect to shaft, second baffle and shaft It is connected by the elastic strip of bending between close side and shaft outer；Rotatable is provided on the third mounting rod Two gears and third gear are connected between the second gear and third gear by the second casing being set on third mounting rod It connects, the second gear and first gear match transmission, and the double wedge uniformly continuous on the third gear is distributed in its 1/4- On 1/2 outer, it is provided on the cam of the reel side and the matched double wedge of third gear.

The cup bottom end is detachably connected on pedestal as a further improvement of the utility model, in the cup It is provided with second pulley, the second pulley is connected to by connecting rod on the inner wall of cup, and the weight beam lower end connects It is connected to connecting rope, the connecting rope other end bypasses second pulley in cup and is connected with weight.

The cup bottom end is provided with outward flange as a further improvement of the utility model, is provided on the pedestal Sliding slot through pedestal two sides, the both sides cell wall of the sliding slot have extended to form card slot round about, outer on the cup Flange both ends are Wei Yu be in card slot.

As a further improvement of the utility model, at least two first pulleys, institute are provided on first mounting rod It states the demarcation strip that the coil of wire on reel is set on the coil of wire and is divided at least two parts.

The buoyancy experiment equipment for physics teaching of the utility model, weight beam is supported on lifting gear, And its lifting can be made by lifting gear, to which the weight that weight beam lower end is hung to be put into or be left the water to measure Buoyancy size, in continuous mode weight beam will not horizontal jitter, it is convenient and strength-saving, coordinate without other people, one can complete reality It tests, experimental result is also more acurrate.

Description of the drawings

Fig. 1 is the structural schematic diagram of the utility model embodiment 1；

Fig. 2 is the structural schematic diagram outside the utility model embodiment 2 or embodiment 3；

Fig. 3 is 2 partial exploded view of the utility model embodiment；

Fig. 4 is the sectional view of the reel of the utility model embodiment 3；

Fig. 5 is the sectional view of the first gear of the utility model embodiment 3；

Fig. 6 is reel and the matched structural schematic diagram of third gear in the utility model embodiment 2 or embodiment 3；

Fig. 7 is the structure improvement schematic diagram that the utility model can be carried out at the same time contrast experiment.

Specific implementation mode

The utility model is described in further detail below in conjunction with the embodiment given by attached drawing 1-7.

Embodiment 1

A kind of buoyancy experiment equipment for physics teaching, including cup 1, weight 2 and weight beam 3 are contained in cup 1 There are liquid, the side of cup 1 to be placed with graduated cylinder, further includes that spring is driven to survey for measuring the volume that liquid is discharged from cup 1 The lifting gear that power meter 3 lifts, lifting gear include pedestal 41, supporting rack 42, the first mounting rod 43 and the second mounting rod 44, branch 42 bottom end of support is connected on pedestal 41, and pedestal 41 is mainly used for that entire experimental facilities stabilization is made to stand on experimental bench, the first peace Dress bar 43 and the second mounting rod 44 are arranged in parallel and respectively both ends are connected on supporting rack 42, can be revolved on the first mounting rod 43 What is turned is provided with first pulley 5, and rotatable on the second mounting rod 44 to be provided with annular roll wheel 45, reel 45 includes two The cam 451 of side and the intermediate coil of wire 452, the second mounting rod 44 is hollow-core construction, wherein be equipped with shaft 46, shaft 46 and the It is connected by rolling bearing between two mounting rods 44, makes shaft 46 that can be rotated in the second mounting rod 44,46 one end of shaft is pierced by Second mounting rod is simultaneously connected with crank handle 6, is fixedly connected between in the other end and reel 45 of shaft 46, spring dynamometry 3 top of meter is connected with connecting rope 7, and 7 other end of connecting rope is connected after bypassing first pulley 5 with the coil of wire 452 of reel 45, carries out When buoyancy experiment, rotation crank handle 6 drives reel 45 to rotate by shaft 46, to drive the weight of 3 bottom end of weight beam Object 2 enters liquid level in cup 1, records the volume that liquid is discharged in 3 registration of weight beam and graduated cylinder, and liquid will be discharged Volume is weighed, and is then rotated crank handle 6 and is driven reel 45 to rotate backward by shaft 46, to drive weight beam The weight 2 of 3 bottom ends liquid level from cup 1 removes, and the weight 2 for replacing different weight or different volumes carries out next group of comparison reality It tests, or replaces liquid in cup 1 and carry out experiment of the different densities liquid to 1 buoyancy of same weight.

Embodiment 2

Because weight beam 3 and weight 2 have certain speed during falling, excessive velocities can make in cup 1 Liquid splashes out and liquid is made to generate shaking, aggravates the shaking of weight 2 and weight beam 3 in turn, makes 3 registration of weight beam Need for a long time can just settle out, influence conventional efficient, cause repeat test obtain difference it is larger as a result, in addition, because The equipment for Experiments of Electricity is provided in physical experiment table mostly, it can be had an impact by splashing water；It is shaken only by control Shake the speed of handle 6, it is difficult to which the speed control that weight beam 3 and weight 2 are fallen especially is encountered in rational range Out of patience student, they will obtain the larger experimental data of error, but weight beam 3 is during rising, Speed is not required, rapid increase can promote conventional efficient, based on our structures to the utility model of the above idea Further improvement has been made, weight beam 3 is made intermittently to decline, its certain stabilization time has been given, weakens its shaking, also subtract Impact of the small weight 2 to liquid in cup 1.

Specific improve is that first sleeve 47 and cyclic annular first gear 48, first sleeve are additionally provided on the second mounting rod 44 47 lateral wall is fixedly connected by fixed link 8 with the first mounting rod 43,47 both ends of first sleeve respectively by rolling bearing 9 with Reel 45 is connected with first gear 48, and 45 other end of reel is connected by rolling bearing 9 with the first mounting rod 43, and first 48 other end of gear is connected by rolling bearing 9 with the first mounting rod 43, and the interior edge of reel 45 and first gear 48 is set respectively Two opposite blocks 49 are equipped with, two opposite supports blocks 410, two to be connected with the second mounting rod 44 are provided in shaft 46 It is provided in the inner circle of rolling bearing 9 and supports block 410 is limited into the limiting plate 411 moved therebetween；It further include third installation Bar 412 is provided with second gear 413 and third gear 414, second gear 413 and third gear 414 on third mounting rod 412 It is connected respectively with third mounting rod 412 by rolling bearing, the two can be rotated relative to third mounting rod 412, second gear 413 It is connected by the second casing 415 for being set on third mounting rod 412 between third gear 414, second gear 413 and the One gear 48 matches transmission, and the double wedge uniformly continuous on third gear 414 is distributed on the outer of its 1/4-1/2, reel Be provided on the cam 451 of 45 sides with 414 matched double wedge of third gear, pass through the peripheral rim portion in third gear 414 Double wedge is arranged in paragraph, to drive 45 intermittent rotary of reel, to realize that the interval of weight beam 3 declines, and third gear 414 Outer distribution double wedge number determine the length of intermittent time；It is fixedly connected with shaft 46 in embodiment 1 and reel 45 Mode it is different, shaft 46 and reel 45 are movable cooperation in the present embodiment, when needing that weight beam 3 is made to increase, So that shaft 46 is moved horizontally with respect to the second mounting rod 44, is moved to supports block 410 and limiting plate 411 in shaft 46 and offsets, turn at this time The block 49 on edge matches in supports block 410 and reel 45 on axis 46, shakes crank handle 6 at this time, and shaft 46 drives reel 45 Rotation, first gear 48 will not rotate, 45 continuous rotation of reel, drive 3 rapid increase of weight beam, in addition, because the Only have segment section that double wedge is distributed on three gears, 414 outer, 45 continuous rotation of reel can not drive third gear 414 continuous Rotation；When needing that weight beam 3 is made to decline, makes shaft 46 relative to the 44 horizontal negative direction movement of the second mounting rod, be moved to Supports block 410 and another piece of limiting plate 411 offset in shaft 46, at this time in shaft 46 in supports block 410 and first gear 48 edge gear Block 49 matches, and shakes crank handle 6 at this time, and shaft 46 drives first gear 48 to rotate, and first gear 48 drives second gear 413 Rotation, second gear 413 drive third gear 414 to rotate, and third gear 414 drives 45 intermittent rotary of reel, to drive Weight beam 3 intermittently declines.

Embodiment 3

Also for the interval decline for realizing weight beam 3, specific improvement is as follows for the improvement of structure in embodiment 3, the First sleeve 47 and cyclic annular first gear 48 are additionally provided on two mounting rods 44, the lateral wall of first sleeve 47 passes through fixed link 8 It is fixedly connected with the first mounting rod 43,47 both ends of first sleeve pass through rolling bearing 9 and reel 45 and first gear 48 respectively It is connected, 45 other end of reel is connected by rolling bearing 9 with the first mounting rod 43, and 48 other end of first gear passes through rolling Bearing 9 is connected with the first mounting rod 43；The interior edge of reel 45 is provided with inclined double wedge in the counterclockwise direction, first gear 48 Interior edge be provided with inclined double wedge along clockwise direction, be hinged on 46 outer of shaft and supported with reel 45 matched first Block 416 and with 48 matched second baffle 417 of first gear, the opposite shaft 46 of the first baffle 416 is to side clockwise To inclination, the first end of the baffle 416 far from shaft 46 is located in reel 46 between two double wedges, the first baffle It is connected by the elastic strip 418 of bending between 416 and close 46 outer of side and shaft of shaft 46,417 phase of the second baffle Countershaft 46 tilts counterclockwise, and the second end of the baffle 417 far from shaft 46 is located in first gear 48 along two Between double wedge, connected by the elastic strip 418 of bending between the second baffle 417 and close 46 outer of side and shaft of shaft 46 It connects, the above structure design makes, when crank handle 6 drives shaft 46 to rotate clockwise, the first baffle 416 is clockwise with shaft 46 Rotation, for the first baffle 416 during rotating clockwise, the end far from shaft 46 can arrive to the convex of edge in reel 45 Tooth, to drive reel 45 to rotate clockwise together, while the second baffle 417 is also that can be rotated clockwise with shaft 46 , the second baffle 417 one end far from shaft 46 during rotation can arrive in first gear 48 along upper double wedge, from And the elastic strip 418 of bending is made further to bend, make the second baffle 417 along the hinge joint rotation with shaft 46, to more It crosses in first gear 48 along upper double wedge so that first gear 48 can't be driven to rotate when shaft 46 rotates clockwise；Similarly, When shaft 46 rotates counterclockwise, also first gear 48 can only be driven to rotate, reel 45 can not be driven to rotate；Third is installed Second gear 413 and third gear 414 are provided on bar 412, second gear 413 and third gear 414 pass through the axis of rolling respectively Hold and be connected with third mounting rod 412, the two can be rotated relative to third mounting rod 412, second gear 413 and third gear 414 it Between connected by the second casing 415 for being set on third mounting rod 412, second gear 413 and first gear 48 match biography Dynamic, the double wedge uniformly continuous on third gear 414 is distributed on the outer of its 1/4-1/2, the cam 451 of 45 side of reel On be provided with and 414 matched double wedge of third gear.

It is identical in the appearance of mechanism and embodiment 2 after it is improved, only to reel 45 and first gear 48 and shaft 46 Fit system improve so that without making shaft 46 move horizontally with respect to the first mounting rod 43, can realize that shaft 46 is suitable Hour hands only drive 45 continuous rotation clockwise of reel when rotating, to make 3 rapid increase of weight beam, equally, because the Only have segment section that double wedge is distributed on three gears, 414 outer, 45 continuous rotation of reel can not drive third gear 414 to connect Continuous rotation；First gear 48 is only driven to rotate counterclockwise when shaft 46 rotates counterclockwise, first gear 48 drives second gear 413 It rotates clockwise, second gear 413 drives third gear 414 to rotate clockwise, and third gear 414 drives reel 45 counterclockwise Intermittent rotary, to drive weight beam 3 intermittently to decline.

As a kind of improved specific implementation mode, 1 bottom end of cup is detachably connected on pedestal 41, is arranged in cup 1 There are second pulley 14, second pulley 14 to be connected to by connecting rod on the inner wall of cup 1,3 lower end of weight beam is connected with Splicing 7,7 other end of connecting rope bypass second pulley 14 in cup 1 and are connected with weight 2.In buoyancy experiment teaching, floated Relationship experiments between power and the volume of weight 2, or verification when weight 2 is completely into liquid after buoyancy size and weight 2 into When entering the unrelated experiment of depth of liquid, during weight 2 is pressed into cup 1 in liquid, due to being pressed on weight 2 Power it is uneven, and so that weight beam 3 is read unstable for roll and pitch in a liquid for weight 2, leads to experimental result Easy to produce large error.The above structure design allows to pull up weight beam 3, and weight 2 is made to progress into liquid In, whole process uniform force.

As a kind of improved specific implementation mode, 1 bottom end of cup is provided with outward flange 11, is provided through on pedestal 41 The sliding slot 12 of 41 two sides of pedestal, the both sides cell wall of sliding slot 12 have extended to form card slot 13 round about, evagination on cup 1 11 both ends of edge are Wei Yu be in card slot 13.When needing cup 1 being fixed on pedestal 41, it is only necessary to be caught in 11 part of outward flange In card slot 13, push cup 1 that it is made to slide into suitable position along sliding slot 12, experiment terminates, and cup 1 is pushed to make it along sliding slot 12 Mobile, when outward flange 11 is removed from card slot 13, cup is detached from from pedestal 41, and the above structure design is in order to avoid cup 1 It is moved relative to pedestal 41 by upward power, while can also prevent from unintentionally encountering cup 1 to a certain extent it is made to topple over, liquid It is spread in physical experiment table, Experiments of Electricity equipment is had an impact.

As a kind of improved specific implementation mode, there are two first pulley 5, reels 45 for setting on the first mounting rod 43 The demarcation strip 453 that the upper coil of wire 452 is set on the coil of wire 452 divides for two parts, this structure design be to be able to simultaneously into Two groups of experiments of row divide two weight beams 3 by connecting rope 7 around different first pulleys 5 and by demarcation strip 453 respectively The different section coils of wire 452 gone out are connected, such as in buoyancy effect of the liquid for carrying out different densities to weight 2, can be two It is respectively put into two kinds of liquid of water and alcohol in a cup 1, the identical weight of two specifications 2 is hung under two weight beams 3 End, is carried out at the same time experiment, comparison becomes apparent from, and keeps student's impression more deep, can also improve conventional efficient.

The above is only the preferred embodiment of the utility model, and the scope of protection of the utility model is not limited merely to Above-described embodiment, technical solution belonging to the idea of the present invention belong to the scope of protection of the utility model.It should refer to Go out, for those skilled in the art, it is without departing from the principle of the utility model it is several improvement and Retouching, these improvements and modifications also should be regarded as the scope of protection of the utility model.

Claims

1. a kind of buoyancy experiment equipment for physics teaching, including cup (1), weight (2) and weight beam (3), special Sign is：Further include lifting gear, the lifting gear includes pedestal (41), supporting rack (42), the first mounting rod (43) and Two mounting rods (44), support frame as described above (42) bottom end are connected on pedestal (41), first mounting rod (43) and the second installation Bar (44) is arranged in parallel and respectively both ends are connected on supporting rack (42), rotatable on first mounting rod (43) to set It is equipped with first pulley (5), it is rotatable on second mounting rod (44) to be provided with annular roll wheel (45), the reel (45) include the cam (451) of both sides and the intermediate coil of wire (452), second mounting rod (44) is hollow-core construction, wherein wearing Equipped with shaft (46), described shaft (46) one end is pierced by the second mounting rod (44) and is connected with crank handle (6), the spring dynamometry Connecting rope (7) is connected at the top of meter (3), connecting rope (7) other end bypasses first pulley (5) line with reel (45) afterwards It rolls up (452) to be connected, rotation crank handle (6) drives reel (45) to rotate by shaft (46), to drive weight beam (3) The weight (2) of bottom end enters or removes cup (1).

2. a kind of buoyancy experiment equipment for physics teaching according to claim 1, it is characterised in that：Second peace First sleeve (47) and cyclic annular first gear (48) are additionally provided on dress bar (44), the lateral wall of the first sleeve (47) passes through Fixed link (8) is fixedly connected with the first mounting rod (43), and first sleeve (47) both ends pass through rolling bearing (9) and volume respectively It is connected with first gear (48) around wheel (45), reel (45) other end passes through rolling bearing (9) and the first mounting rod (43) it is connected, first gear (48) other end is connected by rolling bearing (9) with the first mounting rod (43)；The reel (45) and the interior edge of first gear (48) is respectively arranged with two opposite blocks (49), is provided on the shaft (46) opposite Two supports blocks (410), be provided in two rolling bearings (9) being connected with the second mounting rod (44) and limit supports block (410) The limiting plate (411) moved therebetween；Further include third mounting rod (412), it is rotatable on the third mounting rod (412) Be provided with second gear (413) and third gear (414), pass through between the second gear (413) and third gear (414) The second casing (415) connection being set on third mounting rod (412), the second gear (413) and first gear (48) phase Cooperation is driven, and the double wedge uniformly continuous on the third gear (414) is distributed on the outer of its 1/4-1/2, the reel (45) it is provided on the cam (451) of side and third gear (414) matched double wedge.

3. a kind of buoyancy experiment equipment for physics teaching according to claim 2, it is characterised in that：Second peace First sleeve (47) and cyclic annular first gear (48) are additionally provided on dress bar (44), the lateral wall of the first sleeve (47) passes through Fixed link (8) is fixedly connected with the first mounting rod (43), and first sleeve (47) both ends pass through rolling bearing (9) and volume respectively It is connected with first gear (48) around wheel (45), reel (45) other end passes through rolling bearing (9) and the first mounting rod (43) it is connected, first gear (48) other end is connected by rolling bearing (9) with the first mounting rod (43)；The reel (45) interior edge is provided with inclined double wedge in the counterclockwise direction, and the interior edge of the first gear (48) is provided with along side clockwise To inclined double wedge, be hinged on shaft (46) outer with matched first baffle (416) of reel (45) and with Matched second baffle (417) of first gear (48), first baffle (416) is with respect to shaft (46) to side clockwise To inclination, pass through the bullet of bending between first baffle (416) and the close side and shaft (46) outer of shaft (46) Property item (418) connect, second baffle (417) is tilted counterclockwise with respect to shaft (46), second baffle (417) it is connect by the elastic strip (418) of bending between the side close with shaft (46) and shaft (46) outer；The third Second gear (413) and third gear (414), the second gear (413) and are rotatably provided on mounting rod (412) It is connected by the second casing (415) being set on third mounting rod (412) between three gears (414), the second gear (413) and first gear (48) matches transmission, and the double wedge uniformly continuous on the third gear (414) is distributed in its 1/4-1/ On 2 outer, it is provided on the cam (451) of reel (45) side and third gear (414) matched double wedge.

4. according to a kind of buoyancy experiment equipment for physics teaching of claim 1-3 any one of them, it is characterised in that：Institute It states cup (1) bottom end to be detachably connected on pedestal (41), is provided with second pulley (14) in the cup (1), described second Pulley (14) is connected to by connecting rod on the inner wall of cup (1), and weight beam (3) lower end is connected with connecting rope (7), Connecting rope (7) other end bypasses second pulley (14) in cup (1) and is connected with weight (2).

5. a kind of buoyancy experiment equipment for physics teaching according to claim 4, it is characterised in that：The cup (1) bottom end is provided with outward flange (11), and the sliding slot (12) of pedestal (41) two sides is provided through on the pedestal (41), described The both sides cell wall of sliding slot (12) has extended to form card slot (13) round about, and outward flange (11) both ends are on the cup (1) It Wei Yu not be in card slot (13).

6. a kind of buoyancy experiment equipment for physics teaching according to claim 5, it is characterised in that：First peace At least two first pulleys (5) are provided on dress bar (43), the coil of wire (452) is set in the coil of wire on the reel (45) (452) demarcation strip (453) on is divided at least two parts.