Physical experiment demonstration device for verifying air pressure strong storage

Abstract

The utility model discloses a physical experiment demonstration device for verifying air pressure strong storage, which comprises a sealing cover and a sealing base, the sealing cover is arranged above the sealing base in parallel, and a transparent glass tube is sealed and detachably arranged between the sealing cover and the sealing base. A sealed cavity object is arranged in a space formed by the sealing cover, the sealing base and the transparent glass tube; a pressure adjusting mechanism is arranged below the sealing base, the pressure adjusting mechanism comprises a pipeline group and a pushing device, and the pipeline group is communicated and connected with the sealing base; a pressure adjusting mechanism is arranged below the sealing base, and gas can be continuously input into the sealing space through work of the pressure adjusting mechanism, so that the pressure intensity of the sealing space is changed; therefore, when the sealed cavity object is placed in the sealed space, the deformation process of the sealed cavity object can be displayed under the condition that the pressure intensity of the sealed space is increased, so that students can clearly know the strong acting force of the pressure intensity.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of air pressure demonstration, specifically to a physical experiment demonstration device for verifying air pressure. BACKGROUND

[0002] Atmospheric pressure is an important concept in physics, which has a wide and key influence in many aspects of nature and human life. In order to realize the in-depth exploration of natural phenomena, Italian scientist Torricelli first measured the value of atmospheric pressure relatively accurately through the famous Torricelli experiment. He filled a glass tube with one end closed with mercury, then inverted it in the mercury tank, found that the height of the mercury column in the tube would maintain a relatively fixed value, and thus inferred that the atmospheric pressure existed on the liquid surface of the mercury tank, and its size could be indirectly represented by the height of the mercury column.

[0003] Subsequently, the Madenburg hemispherical experiment further enables the public to intuitively feel the powerful force of atmospheric pressure. After the two hemispheres are tightly closed and the air is removed, two teams of horses pull the two hemispheres in opposite directions, and as a result, a lot of effort is spent to pull the hemispheres apart, which vividly demonstrates the huge pressure effect of atmospheric pressure on the outside of the hemispheres, making people have a deeper impression of the existence of atmospheric pressure and its powerful influence.

[0004] The above experiment fully reveals the existence of atmospheric pressure, but in actual teaching, the equipment and site required by the experiment are limited by the reality of the teaching environment. Therefore, in order to enable students to cognize atmospheric pressure in the sense in teaching, teachers usually demonstrate and explain with various experiments, such as the cup covering experiment, the straw drinking beverage, and the syringe sucking medicine.

[0005] A cup filled with water is covered with a paper sheet, then the cup is inverted, it is found that the paper sheet will not fall off and the water will not flow out. This experiment shows that the paper sheet can withstand the weight of water under the action of atmospheric pressure, thereby implying the existence of atmospheric pressure. However, the experiment has some deficiencies. First of all, the size, material of the cup and the fit degree of the paper sheet with the cup opening will affect the success rate and repeatability of the experiment. For example, if the cup opening is not flat or the paper sheet is not flat and tight enough, it is easy to cause the experiment to fail. Secondly, the experimental phenomenon is relatively not intuitive, and for some students, they may only see that the paper sheet does not fall off and the water does not flow out, but they cannot deeply understand that atmospheric pressure is playing a key role, especially for younger students or students with weaker physical foundation, it is difficult to understand.

[0006] The teaching experiment can enable students to cognize the atmospheric pressure in a sensory way, but cannot demonstrate the strong power of the atmospheric pressure, that is, cannot directly demonstrate the strong pressure generated by different degrees of atmospheric pressure, and is not conducive to students to create by using the atmospheric pressure. Practical new type content

[0007] The physical experiment demonstration device for verifying the existence of atmospheric pressure aims to improve the problem that the atmospheric pressure demonstration device is inconvenient to demonstrate the strong pressure of the atmospheric pressure.

[0008] The physical experiment demonstration device for verifying the existence of atmospheric pressure is characterized in that the device comprises a sealing cover and a sealing base, the sealing cover is arranged in parallel above the sealing base, a transparent glass tube is arranged in a sealing and detachable manner between the sealing cover and the sealing base, and a sealing cavity object is arranged in a space formed by the sealing cover, the sealing base and the transparent glass tube; a pressure adjusting mechanism is arranged below the sealing base, the pressure adjusting mechanism comprises a pipeline group and a pushing device, the pipeline group is connected with the sealing base in communication, the pushing device is arranged at the side of the pipeline group, and the pushing device can push gas into the space formed by the sealing cover, the sealing base and the transparent glass tube.

[0009] Preferably, the pipeline group comprises a three-way valve, a three-way pipe, two one-way valves and two gas inlet pipes, the three-way valve is connected with the sealing base in communication, the three-way pipe is arranged at the side of the three-way valve in communication, one-way valves are arranged at the two ends of the three-way pipe in communication, and the ends of the one-way valves away from the three-way pipe are arranged in communication with the gas inlet pipes.

[0010] Preferably, the pushing device comprises a gear box, a reciprocating rod and pistons, a rotating wheel is arranged on the power input shaft of the gear box, a rotating disc is arranged on the power output shaft, a rocker arm is hingedly arranged at the edge of the rotating disc, the other end of the rocker arm is hingedly connected with the reciprocating rod, and the two pistons are arranged at the two ends of the reciprocating rod respectively.

[0011] Preferably, the reciprocating rod is arranged in parallel at the side of the pipeline group, end frames are arranged at the two ends of the reciprocating rod, the two pistons are detachably arranged on the two end frames respectively, and the two pistons are inserted into the two gas inlet pipes respectively.

[0012] Preferably, the piston comprises a pull rod and a plug, the plug is fixedly arranged at the end of the pull rod, an air passage is formed between the plug and the pull rod, and a plugging device is arranged in the air passage.

[0013] Preferably, the plugging device comprises a plugging disc, a spring and an external thread pipe, the plugging disc is arranged in a ring groove at the end of the air passage, a fence cylinder is fixedly arranged at the side of the plugging disc, the length of the fence cylinder is greater than the thickness of the ring groove, the external thread pipe is threadedly installed in the air passage, and the spring in an elongated state is arranged between the external thread pipe and the fence cylinder.

[0014] Preferably, an ear plate is arranged at the edge of the sealing cover, a connecting rod is arranged through the ear plate, an internally threaded pipe is fixedly arranged at the edge of the sealing base, and the threaded bottom of the connecting rod is screwed into the internally threaded pipe.

[0015] Preferably, a first annular groove and a second annular groove are arranged at the mutually close sides of the sealing cover and the sealing base respectively, and the two ends of the transparent glass tube are respectively sealingly inserted into the first annular groove and the second annular groove; a pressure sensor and a control box are arranged on the sealing base, and the pressure sensor and the control box are electrically connected.

[0016] Preferably, a through hole is arranged on the sealing cover, a sealing disc and a camera are arranged at the upper side and the lower side of the through hole respectively, the camera and the sealing disc are connected through bolts, and the camera is electrically connected with the control box.

[0017] Preferably, the camera is located at the inner side of the first annular groove; a perforation is arranged on the ball fixedly installed at the top of the connecting rod, and a driving rod can be inserted and arranged at the perforation.

[0018] Compared with the prior art, the utility model has the advantages that:

[0019] 1、The utility model discloses a sealing cover, a sealing base, a transparent glass tube and the like are arranged, and can be spliced to form a sealed space; a pressure adjusting mechanism is arranged below the sealing base, gas can be continuously input into the sealed space through the working of the pressure adjusting mechanism, and the pressure of the sealed space can be changed; therefore, when a sealed cavity object is placed in the sealed space, the process of deformation of the sealed cavity object can be displayed under the condition that the pressure of the sealed space is increased, and students can clearly understand the strong force of the pressure.

[0020] 2、The utility model discloses a pipeline group, the state of the three-way valve is adjusted, and the orientation of the one-way valve is arranged, so that the air inlet pipe is arranged in communication with the sealed space, a channel is provided for the gas input into the sealed space, meanwhile, the outflow of the gas in the sealed space is avoided, and support is provided for improving the pressure in the sealed space.

[0021] 3、The utility model discloses a pushing device, the rotating disc can be driven to rotate through manual rotation of the gear box, the reciprocating rod is controlled to move reciprocatingly, and the two pistons are forced to move regularly, so that the gas in the air inlet pipe is forced to enter the sealed space through the movement of the pistons, and support is provided for the gas storage in the air inlet pipe through the outward movement of the pistons BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the first schematic view of the overall structure of the utility model;

[0023] Figure 2 It is the second schematic view of the overall structure of the utility model;

[0024] Figure 3It is the structure schematic view of the sealing cover of the utility model;

[0025] Figure 4 It is the local structure schematic view of the sealing cover of the utility model;

[0026] Figure 5 It is the structure schematic view of the sealing base of the utility model;

[0027] Figure 6 It is the structure schematic view of the pressure regulating mechanism of the utility model;

[0028] Figure 7 It is the structure schematic view of the pipeline group of the utility model;

[0029] Figure 8 It is the structure schematic view of the pushing device of the utility model;

[0030] Figure 9 It is the structure schematic view of the reciprocating rod of the utility model;

[0031] Figure 10 It is the structure schematic view of the piston of the utility model.

[0032] In the drawing: 1, transparent glass tube;2, sealing cover;21, first annular groove;22, connecting rod;23, driving rod;24, camera;25, through hole;26, sealing disc;3, sealing base;31, control box;32, internal thread pipe;33, pressure sensor;34, second annular groove;4, pressure regulating mechanism;41, pushing device;411, reciprocating rod;412, rocker arm;413, gear box;414, runner;415, end frame;42, pipeline group;421, three-way valve;422, air inlet pipe;423, check valve;424, three-way pipe;43, piston;431, plug;432, plugging disc;433, fence cylinder;434, spring;435, external thread pipe;436, pull rod. DETAILED DESCRIPTION

[0033] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integral;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can be indirect connection through intermediate medium, can be the intercommunication of two elements or the interaction of two elements.For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0034] The following is further explained in conjunction with the drawings and specific embodiments:

[0035] Example 1

[0036] To visually demonstrate the immense pressure of air, the demonstration device provided in this embodiment can adjust the internal pressure and gradually increase the internal pressure to show the deformation of a sealed cavity object under strong pressure, thereby facilitating students' clear understanding of the powerful effect of pressure.

[0037] like Figures 1-10 As shown, the demonstration device specifically includes a sealing cap 2, a sealing base 3, a transparent glass tube 1, and a pressure regulating mechanism 4. The sealing cap 2 is positioned parallel to the sealing base 3 above it, and its diameter is larger than the outer diameter of the transparent glass tube 1. Therefore, the transparent glass tube 1 forms a sealed space between the sealing cap 2 and the sealing base 3, and a sealed cavity object, such as a three-dimensional shell, is placed in this sealed space. After the sealed cavity object is placed in the sealed space, the demonstrator continuously injects gas into the sealed space by adjusting the state of the pressure regulating mechanism 4. With the volume of the sealed space remaining constant, the gas accumulation leads to an increase in air pressure. When the pressure in the sealed space exceeds the limit of the air pressure that the sealed cavity object can withstand, the sealed cavity object gradually deforms as the pressure increases. If the material of the sealed cavity object is set to a generally recognized hard material, then the powerful pressure can be demonstrated through the deformation of the sealed cavity object.

[0038] To create a sealed space, a first annular groove 21 and a second annular groove 34 are respectively provided on the sides of the sealing cap 2 and the sealing base 3 that are close to each other. A sealing layer is provided within both the first annular groove 21 and the second annular groove 34. Therefore, when both ends of the transparent glass tube 1 are sealed and inserted into the first annular groove 21 and the second annular groove 34 respectively, the sealing layer is compressed, achieving a sealed connection between the transparent glass tube 1 and the sealing cap 2 and the sealing base 3. This facilitates the continuous input of gas to increase the pressure of the sealed space. To ensure the device functions properly, the sealing cap 2, the sealing base 3, and the transparent glass tube 1 are all made of materials with high pressure resistance, such as titanium alloy or high-alumina silicate glass.

[0039] To allow for the placement of objects within the sealed cavity as needed, multiple ear plates are provided along the edge of the sealing cover 2. A connecting rod 22 is threaded through each ear plate. Multiple internally threaded tubes 32 are fixedly installed along the edge of the sealing base 3, each corresponding to one of the ear plates. The bottom thread of the connecting rod 22 is inserted into the internally threaded tube 32. A through hole is provided on a sphere fixedly mounted at the top of the connecting rod 22, through which a driving rod 23 can be inserted. Therefore, after inserting the driving rod 23 into the top of the connecting rod 22, rotating the connecting rod 22 controls whether its bottom is threaded into the internally threaded tube 32, thus determining whether to disassemble the sealing cover 2 and the sealing base 3, providing convenience for workers to handle objects.

[0040] In order to continuously inject gas into the sealed space, the pressure regulating mechanism 4 comprises a pipeline set 42 and a pushing device 41, the pipeline set 42 is connected with the sealed base 3, the pushing device 41 is arranged at the side of the pipeline set 42, through the working of the pushing device 41, the gas can be pushed into the space formed by the sealed cover 2, the sealed base 3 and the transparent glass tube 1, and then the pressure in the sealed space is increased.

[0041] Specifically, the pipeline set 42 comprises a three-way valve 421, a three-way pipe 424, two one-way valves 423 and two gas inlet pipes 422. The three-way valve 421 is connected with the sealed base 3, the three-way pipe 424 is arranged at the side of the three-way valve 421, and the one-way valves 423 are arranged at the two ends of the three-way pipe 424, and the gas inlet pipes 422 are arranged at the ends of the one-way valves 423 away from the three-way pipe 424. The above arrangement makes the pipeline set 42 form a T-shaped structure with two gas inlet ends, and provides a channel for controlling the continuous input of gas into the sealed space through the pipeline set 42.

[0042] In order to make the gas enter the sealed space through the gas inlet pipes 422, the gas can only enter from the gas inlet pipes 422, flow into the three-way pipe 424 through the one-way valves 423. Under the action of the three-way valve 421, the three-way pipe 424 is communicated, and this arrangement can make the gas flow into the sealed space. At the same time, under the action of the one-way valves 423, the channel for the gas to flow from the sealed space to the gas inlet pipes 422 in reverse is blocked, and the pressure stabilization of the sealed space can be realized. When it is needed to release the pressure of the sealed space, the state of the three-way valve 421 is adjusted, so that the gas in the sealed space can be discharged through the three-way valve 421.

[0043] In order to control the gas to enter the sealed space from the two gas inlet pipes 422, the pushing device 41 comprises a gear box 413, a reciprocating rod 411 and a piston 43. The gear box 413 is installed on the sealed base 3, and a rotating wheel 414 is arranged on the power input shaft of the gear box 413, and a rotating disc is arranged on the power output shaft. When the rotating disc is held by the worker, the rotating disc can drive the rotating wheel 414 of the gear box 413 to rotate, and through the cooperation of various gears in the gear box 413, the worker only needs to exert a small force to drive the rotating disc to overcome a large resistance. A rocker arm 412 is hingedly arranged at the edge of the rotating disc, and the other end of the rocker arm 412 is hingedly connected with the reciprocating rod 411, so that under the condition of rotation of the rotating disc, the reciprocating rod 411 can be controlled to move back and forth through the transmission of the rocker arm 412.

[0044] The reciprocating rod 411 is arranged in parallel with the side of the pipeline group 42, and end frames 415 are arranged at both ends of the reciprocating rod 411. Two pistons 43 are respectively arranged on the two end frames 415 and are respectively inserted into the two air inlet pipes 422. Therefore, during the reciprocating movement of the reciprocating rod 411, the two pistons 43 are controlled to move reciprocatingly regularly. That is, when one piston 43 moves into the air inlet pipe 422 to force the gas to flow into the sealed space, the other piston 43 moves out to store the gas, so as to force the stored gas to enter the sealed space when the piston 43 is reset.

[0045] In order to facilitate the piston 43 to move out to store the gas, the piston 43 comprises a pull rod 436 and a plug head 431. The plug head 431 is fixedly arranged at the end of the pull rod 436, and an air passage is formed between the plug head 431 and the pull rod 436. A ring groove is arranged at the end of the air passage, and a threaded structure is arranged on the inner side wall. A blocking disc 432 is arranged at the ring groove, and a fence barrel 433 is fixedly arranged on the side edge of the blocking disc 432. The length of the fence barrel 433 is greater than the thickness of the ring groove, and the fence barrel 433 is located in the air passage to limit the movement of the blocking disc 432 and provide a passage for the gas flow. An external threaded pipe 435 is arranged at the threaded structure, and the inside of the external threaded pipe 435 is arranged as a polygonal structure. Therefore, the external threaded pipe 435 can be controlled to rotate and disassembled under the action of a polygonal wrench. A spring 434 is arranged between the fence barrel 433 and the external threaded pipe 435, and the spring 434 is in an elongated state. Therefore, the plug head 431 is controlled to always have a tendency to immerse in the ring groove under the action of the spring 434, so as to block the air passage and provide support for the piston 43 to move into the air inlet pipe 422 to force the gas to enter the sealed space. Of course, the spring 434 can be further elongated, so that the piston 43 moves out to make the blocking disc 432 separate from the ring groove, and the gas can enter the air inlet pipe 422 through the air passage. The blocking disc 432, the external threaded pipe 435 and the spring 434 form a blocking device.

[0046] Example 2

[0047] As Figure 2 , Figure 3As shown in the embodiment 1, in order to monitor the pressure in the sealed space and display the deformation process of the sealed cavity object on a large screen, a pressure sensor 33 and a control box 31 are arranged on the sealed base 3, and a camera 24 is arranged on the sealed cover 2, wherein the camera 24 is located in the sealed space, and the camera 24 can be an industrial pressure-resistant camera, such as an explosion-proof pressure-resistant camera, a deep-sea exploration camera, etc. The pressure sensor 33 and the control box 31 are electrically connected. The control box 31 is provided with an operation screen, an interface, and a controller (such as a PLC) inside, so that the control box 31 can be connected with an external screen and display the pressure in the sealed space. According to the prior art, the pressure sensor is connected with the controller through a data line, such as a SPI (Serial Peripheral Interface) communication protocol output digital signal pressure sensor SPI interface pin (generally including clock line, data line, chip selection line, etc.) and the SPI interface corresponding pin of the controller are connected through a wire.

[0048] As shown in the embodiment 1, in order to monitor the pressure in the sealed space and display the deformation process of the sealed cavity object on a large screen, a pressure sensor 33 and a control box 31 are arranged on the sealed base 3, and a camera 24 is arranged on the sealed cover 2, wherein the camera 24 is located in the sealed space, and the camera 24 can be an industrial pressure-resistant camera, such as an explosion-proof pressure-resistant camera, a deep-sea exploration camera, etc. The pressure sensor 33 and the control box 31 are electrically connected. The control box 31 is provided with an operation screen, an interface, and a controller (such as a PLC) inside, so that the control box 31 can be connected with an external screen and display the pressure in the sealed space. According to the prior art, the pressure sensor is connected with the controller through a data line, such as a SPI (Serial Peripheral Interface) communication protocol output digital signal pressure sensor SPI interface pin (generally including clock line, data line, chip selection line, etc.) and the SPI interface corresponding pin of the controller are connected through a wire. Figure 4 As shown in the embodiment 1, in order to monitor the pressure in the sealed space and display the deformation process of the sealed cavity object on a large screen, a pressure sensor 33 and a control box 31 are arranged on the sealed base 3, and a camera 24 is arranged on the sealed cover 2, wherein the camera 24 is located in the sealed space, and the camera 24 can be an industrial pressure-resistant camera, such as an explosion-proof pressure-resistant camera, a deep-sea exploration camera, etc. The pressure sensor 33 and the control box 31 are electrically connected. The control box 31 is provided with an operation screen, an interface, and a controller (such as a PLC) inside, so that the control box 31 can be connected with an external screen and display the pressure in the sealed space. According to the prior art, the pressure sensor is connected with the controller through a data line, such as a SPI (Serial Peripheral Interface) communication protocol output digital signal pressure sensor SPI interface pin (generally including clock line, data line, chip selection line, etc.) and the SPI interface corresponding pin of the controller are connected through a wire.

[0049] The above is only a preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A physical experimental demonstration device for verifying the existence of air pressure, characterized in that, The device includes a sealing cap (2) and a sealing base (3). The sealing cap (2) is arranged parallel above the sealing base (3), and a transparent glass tube (1) is provided between the sealing cap (2) and the sealing base (3) in a sealed and detachable manner. A sealed cavity object is provided in the space formed by the sealing cap (2), the sealing base (3) and the transparent glass tube (1). A pressure regulating mechanism (4) is provided below the sealing base (3). The pressure regulating mechanism (4) includes a pipe assembly (42) and a pushing device (41). The pipe assembly (42) is connected to the sealing base (3). The pushing device (41) is located on the side of the pipe assembly (42) and can push gas into the space formed by the sealing cap (2), the sealing base (3) and the transparent glass tube (1).

2. The physical experiment demonstration device for verifying the existence of air pressure according to claim 1, characterized in that, The pipeline assembly (42) includes a three-way valve (421), a three-way pipe (424), two one-way valves (423) and two air inlet pipes (422). The three-way valve (421) is connected to the sealing base (3). The three-way pipe (424) is connected to the side of the three-way valve (421). One-way valves (423) are connected to both ends of the three-way pipe (424). The air inlet pipe (422) is connected to the end of the one-way valve (423) away from the three-way pipe (424).

3. The physical experiment demonstration device for verifying the existence of air pressure according to claim 2, characterized in that, The driving device (41) includes a gearbox (413), a reciprocating rod (411), and a piston (43). The gearbox (413) has a rotating wheel (414) on its power input shaft and a turntable on its power output shaft. A rocker arm (412) is hinged to the edge of the turntable. The other end of the rocker arm (412) is hinged to the reciprocating rod (411). Two pistons (43) are respectively located at both ends of the reciprocating rod (411).

4. The physical experiment demonstration device for verifying the existence of air pressure according to claim 3, characterized in that, The reciprocating rod (411) is arranged parallel to the side of the pipe assembly (42). End brackets (415) are provided at both ends of the reciprocating rod (411). The two pistons (43) are detachably mounted on the two end brackets (415) and inserted into the two air intake pipes (422).

5. The physical experiment demonstration device for verifying the existence of air pressure according to claim 4, characterized in that, The piston (43) includes a pull rod (436) and a plug (431). The plug (431) is fixedly disposed at the end of the pull rod (436), and a vent is formed between the plug (431) and the pull rod (436), and a blocking device is disposed in the vent.

6. The physical experiment demonstration device for verifying the existence of air pressure according to claim 5, characterized in that, The blocking device includes a blocking disc (432), a spring (434), and an externally threaded tube (435). The blocking disc (432) is disposed in an annular groove at the end of the ventilator, and a fence tube (433) is fixedly disposed on its side. The length of the fence tube (433) is greater than the thickness of the annular groove, and its end extends into the ventilator. The externally threaded tube (435) is threaded into the ventilator, and a spring (434) in an extended state is installed between the externally threaded tube (435) and the fence tube (433).

7. The physical experiment demonstration device for verifying the existence of air pressure according to claim 1, characterized in that, An ear plate is provided on the edge of the sealing cover (2), and a connecting rod (22) is provided through the ear plate. An internally threaded tube (32) is fixedly provided on the edge of the sealing base (3). The connecting rod (22) has a threaded bottom that is inserted into the internally threaded tube (32).

8. The physical experiment demonstration device for verifying the existence of air pressure according to claim 7, characterized in that, A first annular groove (21) and a second annular groove (34) are respectively provided on the sides of the sealing cover (2) and the sealing base (3) that are close to each other. The two ends of the transparent glass tube (1) are respectively sealed and inserted into the first annular groove (21) and the second annular groove (34). A pressure sensor (33) and a control box (31) are provided on the sealing base (3). The pressure sensor (33) and the control box (31) are electrically connected.

9. The physical experiment demonstration device for verifying the existence of air pressure according to claim 8, characterized in that, A through hole (25) is provided on the sealing cover (2). A sealing plate (26) and a camera (24) are respectively provided on the upper and lower sides of the through hole (25). The camera (24) and the sealing plate (26) are connected by bolts, and the camera (24) is electrically connected to the control box (31).

10. A physical experiment demonstration device for verifying the existence of air pressure according to claim 9, characterized in that, The camera (24) is located inside the first annular groove (21); the ball fixedly installed on the top of the connecting rod (22) has a through hole, and a driving rod (23) can be inserted into the through hole.

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