CN210167002U

CN210167002U - Buoyancy and lever principle comprehensive demonstration device

Info

Publication number: CN210167002U
Application number: CN201920431774.8U
Authority: CN
Inventors: 王梓齐
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-02
Filing date: 2019-04-02
Publication date: 2020-03-20
Anticipated expiration: 2029-04-02

Abstract

The utility model relates to a buoyancy and lever principle comprehensive demonstration device, wherein a container which can move along the lever arm direction is arranged below the OB section of the lever arm; a spring dynamometer is connected between the cross beam and the A end of the lever arm; a guide rod vertical to the lever arm is arranged in the container; the guide rod is provided with a floater which can freely slide up and down along the guide rod; the OB section of the lever arm is provided with a slit which is consistent with the lever arm in direction, and the upper side surface of the OB section of the lever arm is also marked with a force arm scale mark for displaying the force arm length of the OB section; the guide rod passes through the slit. The principle and the operation rule of two knowledge points of the lever and the buoyancy can be displayed through one-time experimental demonstration, and the method is visual and easy to understand the related difficulties. The lever arm of force is convenient to adjust, and the physical parameter of the lever can be changed; the volume reading of the object immersed in the liquid under the action of the buoyancy of the liquid is visual, and the buoyancy data can be obtained conveniently and rapidly. The utility model discloses be favorable to cultivateing student's comprehensive knowledge application ability and computing power.

Description

Buoyancy and lever principle comprehensive demonstration device

Technical Field

The utility model relates to a physical teaching demonstration instrument, concretely relates to buoyancy and lever principle comprehensive demonstration device.

Background

In the middle school physics teaching, as the principle and knowledge of buoyancy and lever are abstract, students need to master related knowledge points skillfully, and the teaching is generally required to be demonstrated through tool sites. The existing physical teaching aids are few in types, the functions of the existing physical teaching aids are generally limited to demonstration of a single knowledge point, and the requirements of teaching demonstration are difficult to meet.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a buoyancy and lever principle comprehensive demonstration device is provided, with the demonstration function collection of two knowledge points of buoyancy and lever in one set of teaching aid to can present corresponding physical state through the change of a plurality of parameters, obtain a plurality of physical quantities, realize the ability cultivation of the comprehensive knowledge application of student.

The technical scheme of the utility model as follows:

the utility model provides a buoyancy and lever principle synthesize presentation device which characterized in that: the device comprises upright posts respectively arranged on two sides and a cross beam connected to the upper ends of the two upright posts; the device also comprises a lever support positioned below the cross beam, wherein a lever arm is arranged on the lever support, the fulcrum of the lever arm is an O point, one end of the lever arm is an A end, and the other end of the lever arm is a B end; a container which can move along the lever arm is arranged below the OB section of the lever arm; a spring dynamometer is connected between the cross beam and the A end of the lever arm; a guide rod vertical to the lever arm is arranged in the container; the guide rod is provided with a floater which can freely slide up and down along the guide rod; the OB section of the lever arm is provided with a slit which is consistent with the lever arm in direction, and the upper side surface of the OB section of the lever arm is also marked with a force arm scale mark for displaying the length of the force arm of the OB section; the guide rod passes through the slit; the outer surface of the floater is marked with floater scale marks for displaying the longitudinal size of the floater.

Furthermore, the demonstration device further comprises an experiment table, the lower end of the vertical rod and the lower end of the lever support are respectively fixed with the experiment table, and the container is located on the experiment table.

Further, the float has a longitudinal central hole through which the guide bar passes.

The utility model has the advantages of:

firstly, the principle and the operation rule of two knowledge points of the lever and the buoyancy can be displayed by adopting the device for one-time experimental demonstration, and the device is visual and easy to understand the related difficulties. The lever arm of force is convenient to adjust, and the physical parameter of the lever can be changed; the volume reading of the object immersed in the liquid under the action of the buoyancy of the liquid is visual, and the buoyancy data can be obtained conveniently and rapidly.

Secondly, owing to set up the floater guide bar, the object that receives liquid buoyancy effect can not incline in liquid, and the floating state is stable, and the volume data of submerging in liquid is more accurate.

Thirdly, the device is beneficial to the comprehensive knowledge application capability and the calculation capability of the students.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic top view of the lever of the present invention.

Detailed Description

For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.

As shown in fig. 1, the embodiment of the present invention includes a vertical rod 3 and a beam 7 connected to the upper ends of the two vertical rods 3, which are separately arranged on the left and right sides, and the lower ends of the vertical rods 3 are fixed to the experiment table. The experiment table is further fixedly provided with a lever support 8, the lever support 8 is provided with a lever arm 5 in a hinged mode, the fulcrum of the lever arm 5 is an O point, one end of the lever arm 5 is an A end, and the other end of the lever arm 5 is a B end. Below the OB section of the lever arm 5, a container 1 is arranged which can be moved along the lever arm 5, said container 1 being seated on the laboratory table. A spring force measuring device 6 is connected between the cross beam 7 and the a end of the lever arm 5. The container 1 is internally provided with a guide rod 4 vertical to the trend of the lever arm 5, the lower end of the guide rod 4 is fixed at the inner bottom side of the container 1, the guide rod 4 is provided with a floater 2 capable of freely sliding up and down along the guide rod, and the outer surface of the floater 2 is marked with floater scale marks 21 for displaying the longitudinal size of the floater. The main body (part immersed in water) of the floater 2 is solid and cylindrical, the floater 2 is provided with a longitudinal central hole (vertical to the horizontal plane), the guide rod 4 penetrates through the longitudinal central hole, and the floater 2 can freely lift along the guide rod 4 under the resultant force action of buoyancy and gravity.

As shown in fig. 2, a slit 51 is formed in the OB section of the lever arm 5 and is aligned with the lever arm 5, and a lever arm scale mark 52 for displaying the length of the lever arm of the OB section is further marked on the upper side surface of the OB section of the lever arm 5. The guide rod 4 passes through the slit 51 and can slide horizontally freely in the slit 51. The guide rod 4 is pushed to slide left and right by moving the container 1 left and right (the container 1 can be provided with casters), and the slit 51 is used as a slide rail to change the horizontal position of the upper end of the floater 2 relative to the OB section.

The OA section of lever arm 5 is of fixed length. In use, the container 1 is filled with liquid to float the float 2 in the liquid (the density of the float 2 is less than that of the liquid). The upper end of the float 2 bears against the underside of the OB section of the lever arm 5 and exerts a force on the OB section of the lever arm 5 which is equal to the buoyancy force minus the float weight force. When the lever is balanced, the force value of the spring force measuring device 6 is read, the scale value of the floater scale mark 21 and the scale value of the force arm scale mark 52 are read according to the position of the guide rod, the volume of the floater entering the liquid is read or calculated by utilizing the scale value of the floater scale mark 21, the buoyancy of the liquid to the floater is calculated, and the calculation is carried out according to the known OA segment length and the gravity of the floater 2.

The density of the injected liquid or floaters 2 with different densities and the same size and shape in the container 1 is changed, the lever is balanced by horizontally moving the container 1 left and right, and multiple test demonstration of changing different parameters can be realized.

Claims

1. The utility model provides a buoyancy and lever principle synthesize presentation device which characterized in that: the device comprises two upright posts (3) respectively arranged on two sides and a cross beam (7) connected to the upper ends of the two upright posts (3); the device is characterized by further comprising a lever support (8) positioned below the cross beam (7), wherein a lever arm (5) is installed on the lever support (8), the fulcrum of the lever arm (5) is an O point, one end of the lever arm (5) is an A end, and the other end of the lever arm (5) is a B end; a container (1) which can move along the moving direction of the lever arm (5) is arranged below the OB section of the lever arm (5); a spring dynamometer (6) is connected between the cross beam (7) and the A end of the lever arm (5); a guide rod (4) which is vertical to the direction of the lever arm (5) is arranged in the container (1); the guide rod (4) is provided with a floater (2) which can freely slide up and down along the guide rod; a slit (51) which is consistent with the lever arm (5) in direction is formed in the OB section of the lever arm (5), and a force arm scale mark (52) for displaying the length of the force arm of the OB section is marked on the upper side surface of the OB section of the lever arm (5); the guide rod (4) passes through the slit (51); the outer surface of the floater (2) is marked with floater scale marks (21) for displaying the longitudinal size of the floater.

2. The buoyancy and lever principle comprehensive demonstration device according to claim 1, wherein: the demonstration device further comprises an experiment table, the lower end of the vertical rod (3) and the lower end of the lever bracket (8) are respectively fixed with the experiment table, and the container (1) is located on the experiment table.

3. The buoyancy and lever principle comprehensive demonstration device according to claim 1 or 2, wherein: the floater (2) is provided with a longitudinal central hole, and the guide rod (4) passes through the longitudinal central hole.