CN213025001U

CN213025001U - Buoyancy demonstration device for physics teaching

Info

Publication number: CN213025001U
Application number: CN202021794174.7U
Authority: CN
Inventors: 杜良美; 吴勇
Original assignee: Eastern Liaoning University
Current assignee: Eastern Liaoning University
Priority date: 2020-08-25
Filing date: 2020-08-25
Publication date: 2021-04-20
Anticipated expiration: 2030-08-25

Abstract

The utility model relates to a physical teaching technical field especially relates to a physical teaching buoyancy presentation device, including base, spring dynamometer and container, welded the support on the base, install the controller on one side lateral wall of support, and install solid fixed cylinder on the opposite side lateral wall of support, it is provided with the piston rod to slide through linear electric motor in the solid fixed cylinder, and the bottom of solid fixed cylinder has the water intaking valve soon, the spring dynamometer hangs on the support to the bottom of spring dynamometer is hung there is hollow sacculus, is equipped with the water filling valve on the outer wall of sacculus, and the inside of water filling valve is equipped with the solenoid valve, and has inlayed first sensor on the interior diapire of sacculus, is connected with the water pipe between water intaking valve and the water filling valve. Compared with the prior art, the utility model discloses can swiftly adjust the different weight of heavy object conveniently, need not to change the heavy object frequently again to the effect of buoyancy demonstration is more directly perceived, and the reading is also more convenient moreover.

Description

Buoyancy demonstration device for physics teaching

Technical Field

The utility model relates to a physical teaching technical field especially relates to a physical teaching buoyancy presentation device.

Background

Buoyancy refers to the difference (resultant force) between the pressures of the fluid (liquid and gas) on the surfaces of an object in the fluid (including liquid and gas). Known from archimedes' principle: the object immersed in the liquid is subjected to upward buoyancy equal to the weight of the object to displace the liquidForce, i.e. F_{Floating body}＝G_{Liquid drainage}＝ρ_{Liquid for treating urinary tract infection}gV_{Row board}。（V_{Row board}Representing the volume of liquid displaced by the object) is directed vertically upward and through the centroid of the displaced fluid.

In the existing buoyancy demonstration device, different weights are usually adopted to measure the buoyancy generated by different weights, and the buoyancy needs to be manually replaced for many times, which is troublesome, so that a device is urgently needed to solve the problem.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problems in the prior art and providing a buoyancy demonstration device for physics teaching.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a buoyancy demonstration device for physics teaching comprises a base, a spring dynamometer and a container, wherein a support is welded on the base, a controller is installed on one side wall of the support, a fixed cylinder is installed on the other side wall of the support, a piston rod is arranged in the fixed cylinder in a sliding mode through a linear motor, and a water inlet valve is screwed at the bottom end of the fixed cylinder;

the spring dynamometer is hung on the support, a hollow ball bag is hung at the bottom of the spring dynamometer, a water adding valve is arranged on the outer wall of the ball bag, an electromagnetic valve is arranged inside the water adding valve, a first sensor is embedded on the inner bottom wall of the ball bag, and a water pipe is connected between the water inlet valve and the water adding valve;

the container is installed on the base, a liquid collector is further arranged on one side of the container, a bottom plate is welded in the liquid collector, a second sensor is embedded in the bottom plate, and an overflow pipe is connected between the liquid collector and the container.

Preferably, a water outlet valve is installed on the side wall of the fixed cylinder, a valve wheel is installed on the water outlet valve, and one end of the water pipe is installed in the water outlet valve.

Preferably, the piston rod is composed of a connecting rod and a piston through welding, the piston slides between the inner walls of the fixed cylinders, the other end of the connecting rod is connected and fixed with the end part of an output shaft of the linear motor, and the linear motor is installed on the top wall of the support through screws.

Preferably, a sealing plate is welded between the inner walls of the water feeding valve, the electromagnetic valve is installed in the middle of the sealing plate through screws, and a battery pack is connected to one side of the electromagnetic valve.

Preferably, the water adding valve is fixedly connected with the water pipe through threads, the end part of the water pipe is communicated with the inlet end of the electromagnetic valve, a pipeline is connected between the water adding valve and the balloon, and one end of the pipeline is installed on the outlet end of the electromagnetic valve through screws.

Preferably, the first sensor and the second sensor are both gravity sensors, and the first sensor and the second sensor are both connected with the controller through pulse signals.

Preferably, the side wall of one side of the container and the top wall of the liquid collector are both welded with connecting seats, and the overflow pipe is fixedly connected with the connecting seats through threads.

The utility model has the advantages that:

through setting up hollow sacculus, utilize to fill water in the sacculus to rely on the sensor to regulate and control the gravity size of this sacculus, with the size change that detects different buoyancy under the different gravity condition, and after the sacculus immerses in the water, the water that spills over directly flows in the liquid trap along the water pipe, reads out the gravity of discharging water through the sensor directly perceivedly once more, compares in prior art, the utility model discloses can swiftly conveniently adjust the different weight of heavy object, need not to change the heavy object frequently again, and the effect of buoyancy demonstration is more directly perceived, and the reading is also more convenient moreover.

Drawings

Fig. 1 is a schematic structural view of a buoyancy demonstration device for physical teaching according to the present invention;

FIG. 2 is a schematic view of the water adding valve installation and the internal structure of the buoyancy demonstration device for physics teaching provided by the utility model;

fig. 3 is the utility model provides a physics teaching buoyancy presentation device's a fixed section of thick bamboo is inside and the unit mount schematic diagram thereof.

In the figure: the device comprises a base 1, a support 11, a controller 12, a fixed cylinder 2, a piston rod 21, a water inlet valve 22, a spring dynamometer 3, a balloon 4, a first sensor 41, a water inlet valve 42, an electromagnetic valve 43, a container 5, a liquid collector 6 and a second sensor 61.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-3, a buoyancy demonstration device for physics teaching comprises a base 1, a spring dynamometer 3 and a container 5, wherein a support 11 is welded on the base 1, a controller 12 (i.e. a PLC controller with a display screen) is installed on one side wall of the support 11, a fixed cylinder 2 is installed on the other side wall of the support 11, a piston rod 21 is arranged in the fixed cylinder 2 in a sliding manner through a linear motor (the piston rod 21 is composed of a connecting rod and a piston through welding, the piston slides between the inner walls of the fixed cylinder 2, the other end of the connecting rod is connected and fixed with the output shaft end of the linear motor, the linear motor is installed on the top wall of the support 11 through screws) so as to conveniently draw water and push water, a water inlet valve 22 is screwed at the bottom end of the fixed cylinder 2 and connected with a water pipe so as to suck water for supplement, a water outlet valve is installed on the side wall, one end of the water pipe is arranged in the water outlet valve;

further, the spring dynamometer 3 is hung on the support 11, a hollow balloon 4 is hung at the bottom of the spring dynamometer 3 and used for storing water, so that the weight of the balloon 4 is changed, a water adding valve 42 is arranged on the outer wall of the balloon 4, a sealing plate is welded between the inner walls of the water adding valve 42, an electromagnetic valve 43 is installed in the middle of the sealing plate through screws to control the conduction of the water adding valve 42, a battery pack is connected to one side of the electromagnetic valve 43, a first sensor 41 is embedded in the inner bottom wall of the balloon 4, and a water pipe is connected between the water adding valve 22 and the water adding valve 42;

further, container 5 installs on base 1, and still is equipped with liquid trap 6 in its one side, by the discharged water in the collection container 5, has welded the bottom plate in the liquid trap 6, has inlayed second sensor 61 on the bottom plate, and is connected with the overflow pipe between liquid trap 6 and the container 5, all has welded the connecting seat on the lateral wall of one side of container 5 and on the roof of liquid trap 6, passes through threaded connection between overflow pipe and the connecting seat and fixes.

The water adding valve 42 is fixedly connected with the water pipe through threads, the end part of the water pipe is communicated with the inlet end of the electromagnetic valve 43, a pipeline is connected between the water adding valve 42 and the balloon 4, and one end of the pipeline is installed on the outlet end of the electromagnetic valve 43 through screws; the first sensor 41 and the second sensor 61 are both gravity sensors, and the first sensor 41 and the second sensor 61 are both connected to the controller 12 by pulse signals.

In this embodiment, first, water is filled into the container 5 (not filled), an overflow pipe is taken to pass through a connecting seat in the container 5, one end of the overflow pipe is screwed on the connecting seat of the liquid collector 6, the other end of the overflow pipe extends to the bottom of the container 5, the controller 12 is started, and at this time, the first sensor 41 and the second sensor 61 respectively transmit the weight data monitored at this time into the controller 12 and display the weight data on the display screen;

then, the balloon 4 is hung on the spring dynamometer 3 and is sunk into the water in the container 5, after the balloon is sunk, the water in the container 5 is pressed out from the overflow pipe, so that the drained water flows into the liquid collector 6, after the drained water flows out, the weight monitored by the second sensor 61 is changed and displayed on a display screen, when the water does not overflow any more, the change value of the number of the second sensor 61 at the moment is recorded, and the change value is the buoyancy of the balloon 4 under the weight according to the Archimedes principle;

after measurement, the balloon 4 is taken out of the water, the set early warning value of the first sensor 41 is adjusted on the controller 12, the battery switch of the water adding valve 42 on the balloon 4 is pressed, the electromagnetic valve 43 is started, and the linear motor is started to push the piston rod 21 downwards, so that the water in the fixed cylinder 2 flows into the balloon 4 along the water pipe, when the water flows into the balloon 4, the weight of the balloon 4 is increased, when the weight reaches the set early warning value, the controller 12 immediately controls the electromagnetic valve 43 and the linear motor to be closed, the water in the fixed cylinder 2 stops flowing out, then, the reset key of the controller 12 is pressed again to reset the monitoring values of the two sensors, the two weight values are monitored again, then, the balloon 4 is placed in the container 5 for measurement, the buoyancy of the balloon 4 under the current weight is recorded, and after the measurement is finished, the buoyancy when other weights are measured can be measured by adjusting the buoyancy.

When the fixed cylinder 2 is filled with water, the linear motor is manually started firstly, the linear motor is made to drive the piston rod 21 to move the piston to the bottom end of the fixed cylinder 2, then the water inlet valve at the bottom of the fixed cylinder 2 is unscrewed, the water pipe is connected, the water pipe is led into the water, then the linear motor is started again, the piston rod 21 is driven to slowly move upwards by starting, water is sucked into the fixed cylinder 2 through suction, and when the piston moves upwards to the top end of the fixed cylinder 2, the linear motor is closed, and the water inlet valve is screwed.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A buoyancy demonstration device for physical teaching comprises a base (1), a spring dynamometer (3) and a container (5), and is characterized in that a support (11) is welded on the base (1), a controller (12) is installed on one side wall of the support (11), a fixed cylinder (2) is installed on the other side wall of the support (11), a piston rod (21) is arranged in the fixed cylinder (2) in a sliding mode through a linear motor, and a water inlet valve (22) is screwed at the bottom end of the fixed cylinder (2);

the spring dynamometer (3) is hung on the support (11), a hollow ball bag (4) is hung at the bottom of the spring dynamometer (3), a water adding valve (42) is arranged on the outer wall of the ball bag (4), an electromagnetic valve (43) is arranged inside the water adding valve (42), a first sensor (41) is embedded in the inner bottom wall of the ball bag (4), and a water pipe is connected between the water inlet valve (22) and the water adding valve (42);

the container (5) is installed on the base (1), a liquid collector (6) is further arranged on one side of the container, a bottom plate is welded in the liquid collector (6), a second sensor (61) is embedded in the bottom plate, and an overflow pipe is connected between the liquid collector (6) and the container (5).

2. The physical teaching buoyancy demonstration device according to claim 1, wherein a water outlet valve is installed on the side wall of the fixed cylinder (2), a valve wheel is installed on the water outlet valve, and one end of the water pipe is installed in the water outlet valve.

3. The physical teaching buoyancy demonstration device according to claim 1, characterized in that the piston rod (21) is composed of a connecting rod and a piston through welding, the piston slides between the inner walls of the fixed cylinder (2), the other end of the connecting rod is connected and fixed with the end of the output shaft of the linear motor, and the linear motor is installed on the top wall of the bracket (11) through screws.

4. The physics teaching buoyancy demonstration device according to claim 1, characterized in that a sealing plate is welded between the inner walls of the water adding valve (42), the electromagnetic valve (43) is installed in the middle of the sealing plate through screws, and a battery pack is connected to one side of the electromagnetic valve (43).

5. The physics teaching buoyancy demonstration device according to claim 1, characterized in that the water adding valve (42) is fixed with the water pipe by threaded connection, and the end of the water pipe is communicated with the inlet end of the solenoid valve (43), a pipeline is connected between the water adding valve (42) and the balloon (4), and one end of the pipeline is installed on the outlet end of the solenoid valve (43) by screws.

6. The physical teaching buoyancy demonstration device according to claim 1, wherein the first sensor (41) and the second sensor (61) are both gravity sensors, and the first sensor (41) and the second sensor (61) are both connected with the controller (12) through pulse signals.

7. The buoyancy demonstration device for physics teaching according to claim 1, wherein a connecting seat is welded on one side wall of the container (5) and the top wall of the liquid collector (6), and the overflow pipe is fixed with the connecting seat through threaded connection.