A fountain experiment comparison display system

Abstract

The present invention provides a fountain experiment comparison display system, including an iron frame, a plurality of fountain experiment generating devices arranged on the iron frame, and a control mechanism for controlling the fountain experiment generating devices to synchronously perform fountain experiments; and also including a fountain experiment principle display device arranged on the iron frame, the fountain experiment principle display device is controlled by the control mechanism to synchronously perform fountain experiments with the fountain experiment generating devices. The present invention uses a control mechanism to synchronously control a plurality of fountain experiment generating devices filled with different gases to perform fountain experiments, and according to the speed of the fountain experiment and the solution left in the final flask, the difference in solubility of different gases in water can be intuitively displayed. By setting up the fountain experiment principle display device, it can be intuitively displayed that the fundamental principle of the fountain experiment is the pressure difference principle, and a comparative display of physical fountain experiments and chemical fountain experiments can also be performed.

Description

Technical Field

[0001] The invention relates to the field of high school chemistry experimental equipment, and in particular to a fountain experiment comparison display system. Background Art

[0002] Chemistry is a compulsory course in my country's secondary education. Chemistry comes from experiments, and the teaching process is essential for the display of related experiments. The fountain experiment is one of the chemical experiments with high display value. It is used to prove that different gases have different solubility in water. Because the fountain experiment is very interesting and has good intuitive effects, it is very helpful to cultivate students' interest in learning chemistry. However, the current fountain experiment has always been in a single display mode, unable to intuitively display the different solubility of different gases in water and unable to show that the fountain experiment reflects the essence of the pressure principle. The fountain experiment display used in schools is still in the stage of assembling and displaying with basic chemical instruments. There are problems such as long experimental time and complicated instrument assembly process. At present, my country's middle schools are constantly exploring the reform of education methods, with the aim of improving students' learning efficiency and cultivating students' interest in learning. In terms of chemical course education, improving relevant experimental devices enables the classroom to efficiently and intuitively display the experimental effects and more clearly reveal the essence behind the experiment. This has become a major trend in future classroom experimental displays and is of great significance to domestic secondary education. Summary of the invention

[0003] In view of this, the present invention provides a fountain experiment comparison display system, which can intuitively display the different solubilities of different gases in water by setting up multiple fountain experiment generating devices and using a control mechanism to control the multiple fountain experiment generating devices to synchronously perform fountain experiments. At the same time, the fountain experiment principle display device can intuitively reflect the pressure difference nature of the fountain experiment.

[0004] The fountain experiment comparison display system provided by the present invention comprises an iron frame, a plurality of fountain experiment generating devices arranged on the iron frame, and a control mechanism for controlling the fountain experiment generating devices to synchronously perform the fountain experiment. By using the control mechanism to synchronously control a plurality of fountain experiment generating devices filled with different gases to perform the fountain experiment, the difference in the solubility of different gases in water can be intuitively displayed according to the speed of the fountain experiment and the solution left in the final flask.

[0005] Further, the fountain experiment generating device comprises a flask for containing gas, a beaker for containing liquid, a catheter assembly for connecting the flask and the beaker, and a liquid syringe, the flask is provided with a sealing plug at the bottle mouth, a bracket is provided on the iron frame, a plurality of bracket mounting holes are provided on the iron frame, and a plurality of brackets are installed to facilitate the construction of the overall system, the flask is invertedly mounted on the bracket through a flask clamp, the beaker is placed on the iron frame, the catheter assembly comprises a catheter I, a catheter II and a rubber tube connecting the catheter I and the catheter II, the upper end of the catheter I is inserted into the flask, the lower end of the catheter II extends into the beaker, and the needle of the liquid syringe is inserted into the flask for injecting liquid into the flask;

[0006] The control mechanism includes a rubber tube synchronous clamping assembly and a syringe synchronous pushing assembly, both of which are installed on a bracket. After the flask is filled with gas and sealed, the whole system is built, the rubber tube synchronous clamping assembly is kept to clamp the rubber tubes of different fountain experiment devices, and the conduit I and conduit II are kept disconnected. Then, the syringe synchronous pushing assembly is used to synchronously inject an equal amount of water into the flasks of different fountain experiment devices at the same time, ensuring that the type of gas is the only variable in the fountain experiment, reducing the error caused by the opening reaction time and the uneven volume of water to the experiment. After the water injection is completed, the rubber tube is synchronously released through the rubber tube synchronous clamping assembly, so that conduit I and conduit II are connected, so that different fountain experiment devices can perform fountain experiments at the same time. According to the speed of the fountain experiment and the solution left in the flask at the end, the difference in the solubility of different gases in water can be intuitively observed.

[0007] Furthermore, it also includes a fountain experiment principle display device arranged on the iron frame, and the fountain experiment principle display device is controlled by a control mechanism to perform a fountain experiment synchronously with the fountain experiment generating device;

[0008] The fountain experiment principle demonstration device includes two flasks for containing gas, a beaker for containing liquid, a catheter assembly for connecting the flask and the beaker, a liquid syringe and a gas extraction syringe. The two bottle mouths of the two flasks are both provided with sealing plugs. The two flasks are invertedly mounted on a bracket through a flask clamp. The beaker is placed on an iron frame. The catheter assembly includes a catheter I, a catheter II and a rubber tube connecting catheter I and catheter II. The upper end of the catheter I is inserted into the flask from the bottle mouth of the flask facing the beaker, and the needle of the liquid syringe is also inserted into the flask from the bottle mouth. The lower end of the catheter II extends into the beaker, and the gas extraction syringe is inserted from the other bottle mouth of the two flasks to extract the gas in the flask. The fountain experiment principle demonstration device is set up mainly to reveal the principle of the fountain experiment to students. Specifically, the experiment can be demonstrated in two ways: 1. Gas insoluble in water can be loaded into two flasks. After the control mechanism controls the liquid syringe to inject water into the flask and loosens the rubber tube, the fountain experiment can be triggered by extracting the air in the flask through the gas extraction syringe inserted from the other bottle mouth of the flask. This is a physical fountain experiment, which can show that the fundamental principle of the fountain experiment is the pressure difference principle. By extracting different volumes of air, fountain phenomena of different degrees can be achieved, which can be compared with the chemical fountain experiment; 2. The same and equal amount of gas as that in one of the fountain experiment generating devices can be loaded into the two flasks. The fountain experiment generating device and the fountain experiment principle demonstration device containing the same amount of the same gas can be used to perform the fountain experiment simultaneously through the control mechanism. During the experiment, the gas in the two flasks is extracted by the gas extraction syringe inserted in the other bottle mouth of the two flasks to reduce their internal pressure. It can be intuitively observed that the fountain experiment generating device and the fountain experiment principle demonstration device will produce different fountain phenomena. This comparison can also intuitively reflect that the essence of the fountain experiment is due to the gas pressure difference. The gas extraction syringe can be mounted on the bracket of the iron frame by means of a mounting clamp.

[0009] Furthermore, the rubber tube synchronous clamping and releasing assembly comprises a housing I, a first clamping plate and a second clamping plate which are slidably arranged in the housing I, and the second clamping plate is arranged parallel to and below the first clamping plate;

[0010] The first clamping plate protrudes downward to form a plurality of first mounting blocks, and the first mounting block is provided with a first clamping block perpendicular to the plane where the first mounting block is located. The second clamping plate protrudes upward to form a plurality of second mounting blocks, and the second mounting block is provided with a second clamping block perpendicular to the plane where the second mounting block is located. The housing I is provided with a slide groove I for the first clamping block and the second clamping block to extend out, and the first clamping block and the second clamping block slide relative to each other in the horizontal direction in the slide groove I to achieve the clamping and loosening of the rubber tube. This arrangement can form multiple groups of clamping mechanisms that can be clamped and loosened synchronously. These clamping mechanisms can be installed corresponding to different fountain experiment generating devices, so that the rubber tube can be clamped and loosened at the same time, and different fountain experiment generating devices can perform fountain experiments synchronously. The end face of the first clamping block and the end face of the second clamping block are preferably planes, which can fit each other during the horizontal sliding process to ensure that the rubber tube can be clamped.

[0011] Further, the left end of the first clamping plate extends out from the shell I, and the right end of the second clamping plate extends out from the shell I;

[0012] Anti-reverse clamps are installed in both the first clamping plate and the second clamping plate. The left end surface of the first clamping plate is axially recessed to form a mounting groove for the anti-reverse clamp. The right end surface of the second clamping plate is axially recessed to form a mounting groove for the anti-reverse clamp. The side wall of the mounting groove is provided with a through hole connected to the mounting groove. The anti-reverse clamp includes a connecting rod and an anti-reverse tooth arranged on the side wall of the connecting rod. The connecting rod is connected to the inner wall of the mounting groove through a spring. One end of the connecting rod extends out of the mounting groove. The anti-reverse tooth slidably cooperates with the through hole and can extend out of the through hole. The inner wall of the shell I is provided with a serrated groove that cooperates with the anti-reverse tooth. When the first clamping plate and / or the second clamping plate is required to slide, first pull the connecting rod to pull the anti-reverse tooth from the through hole back into the installation groove. When the first clamping plate and / or the second clamping plate slide to a predetermined position, such as a position that can just cooperate with each other to clamp the rubber tube or release the rubber tube, push the connecting rod, and cooperate with the spring to push the anti-reverse tooth out of the through hole. The anti-reverse tooth can be stuck in the serrated groove set on the inner wall of the shell, thereby locking the position and preventing the first clamping plate and / or the second clamping plate from continuing to slide and affecting the experiment.

[0013] Furthermore, the syringe synchronous pushing assembly includes a shell II, a syringe clamping part arranged on the shell II and a pushing part slidable up and down on the shell II, the pushing part includes a push rod slidable up and down in the shell II and a pushing block arranged outside the shell II and connected to the push rod, the two ends of the push rod extend from both sides of the shell II, and the shell II is provided with a slide groove II for the pushing block to slide up and down, the pushing block slides upward in the slide groove II, pushes the piston rod of the liquid syringe to move upward, and injects liquid into the flask. A push rod mounting hole is provided in the horizontal direction on the upper side of the shell II. After the push rod is installed, the two ends of the push rod extend from the two ends of the hole respectively. The push rod can slide up and down in the mounting hole, driving the push block to slide up and down. The push block can be a whole piece or multiple pieces, which are arranged one by one in correspondence with the position of the liquid syringe. During installation, the free end of the piston rod of the liquid syringe with the same amount of water on different fountain experiment generating devices is arranged above the push block, and the distance from the push block is the same. For example, it can be directly attached to the upper surface of the push block. When water needs to be injected into the flask, the push rod is pushed upward to drive the push block upward, so as to achieve the synchronous injection of the same amount of water into the flasks containing different gases. By setting the syringe clamp, it can be ensured that the syringe can remain stable when injecting liquid into the flask, so that the injection process can be carried out more smoothly, and the shaking that causes the liquid syringe to push out the liquid volume unevenly will be avoided, which will bring errors to the experiment.

[0014] Furthermore, the syringe clamp includes a third clamping plate and a fourth clamping plate which are slidably disposed in the housing II, and the fourth clamping plate is disposed parallel to and below the third clamping plate;

[0015] The third clamping plate protrudes downward to form a plurality of third mounting blocks, and the third mounting block is provided with a third clamping block perpendicular to the plane where the third mounting block is located. The fourth clamping plate protrudes upward to form a plurality of fourth mounting blocks, and the fourth mounting block is provided with a fourth clamping block perpendicular to the plane where the fourth mounting block is located. The housing II is provided with a slide groove III for the third clamping block and the fourth clamping block to extend out. The end faces of the third clamping block and the fourth clamping block are both recessed inward to form a clamping opening, specifically, a clamping opening approximately in the shape of an arc, which can better clamp the syringe barrel. The third clamping block and the fourth clamping block slide relative to each other in the horizontal direction in the slide groove III to achieve clamping of the syringe. The clamping structure similar to the rubber synchronous clamping assembly is adopted, and no new structure needs to be designed separately, and the operation is simple.

[0016] Further, the left end of the third clamping plate extends out from the shell II, and the right end of the fourth clamping plate extends out from the shell II;

[0017] The third clamping plate and the fourth clamping plate are both installed with anti-reverse clamps. The left end surface of the third clamping plate is axially recessed to form an installation groove for the anti-reverse clamp. The right end surface of the fourth clamping plate is axially recessed to form an installation groove for the anti-reverse clamp. The side wall of the installation groove is provided with a through hole connected to the installation groove. The anti-reverse clamp includes a connecting rod and an anti-reverse tooth arranged on the side wall of the connecting rod. The connecting rod is connected to the inner wall of the installation groove by a spring. One end of the connecting rod extends out of the installation groove. The anti-reverse tooth is slidably matched with the through hole and can be extended from the through hole. The inner wall of the housing II is provided with a serrated groove matched with the anti-reverse tooth. By setting the anti-reverse clamp, the relative position of the third clamping plate and the fourth clamping plate can be locked, so as to better clamp the syringe.

[0018] Furthermore, the back of the shell I and the shell II are provided with a plurality of position-adjustable mounting parts. For example, a slide groove can be opened on the back, and the mounting parts can slide horizontally in the slide groove, slide to a predetermined position and then be locked in position by screws. They can be fixedly installed according to the actual placement of the experimental device.

[0019] Beneficial effects of the present invention:

[0020] The fountain experiment comparison and display system provided by the present invention uses a control mechanism to synchronously control multiple fountain experiment generating devices filled with different gases to perform fountain experiments. According to the speed of the fountain experiment and the solution left in the final flask, the difference in solubility of different gases in water can be intuitively displayed. By setting a fountain experiment principle display device, it can be intuitively displayed that the fundamental principle of the fountain experiment is the pressure difference principle, and a comparison display of physical fountain experiments and chemical fountain experiments can also be performed. The fountain experiment comparison and display system of the present invention can provide students with the most intuitive comparison of multiple fountain experiments, and provides a better experimental display method for improving teaching quality and cultivating students' learning interest in middle school chemistry education. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0022] Figure 1 It is a structural schematic diagram of the fountain experiment comparison display system of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the rubber tube synchronous clamping and releasing assembly of the present invention;

[0024] Figure 3 yes Figure 2 A partial enlarged view within the middle dotted circle I;

[0025] Figure 4 yes Figure 3 A top view of

[0026] Figure 5 It is a structural schematic diagram of the synchronous pushing assembly of the syringe of the present invention;

[0027] Figure 6 yes Figure 5 A top view of

[0028] Figure 7 yes Figure 5 The enlarged view of the part within the middle dotted circle J;

[0029] In the figure:

[0030] 1. Iron stand, 11. Bracket, 21. Flask, 22. Beaker, 23. Catheter I, 24. Catheter II, 25. Rubber tube, 26. Liquid syringe, 27. Sealing plug, 31. Two-mouth flask, 32. Gas extraction syringe, 4. Rubber tube synchronous clamping assembly, 41. Shell I, 41a, slide groove I, 42. First clamping plate, 42a, first mounting block, 42b, first clamping block, 43, second clamping plate, 43a, second mounting block, 43b, Second clamping block, 5, syringe synchronous pushing assembly, 51, shell II, 51a, slide groove III, 51b, slide groove II, 52, third clamping plate, 52a, third mounting block, 52b, third clamping block, 53, fourth clamping plate, 53a, fourth mounting block, 53b, fourth clamping block, 54, push rod, 55, push block, 6, anti-reverse clamp, 61, connecting rod, 62, anti-reverse tooth, 63, spring, 44, 56: mounting parts, 43c, 53c: mounting groove. DETAILED DESCRIPTION

[0031] Figure 1 It is a structural schematic diagram of the fountain experiment comparison display system of the present invention; Figure 2 2 is a schematic structural diagram of a rubber tube synchronous clamping and releasing assembly 4 of the present invention; Figure 3 yes Figure 2 A partial enlarged view within the middle dotted circle I; Figure 4 yes Figure 3 A top view of Figure 5 It is a structural schematic diagram of the syringe synchronous pushing assembly 5 of the present invention; Figure 6 yes Figure 5 A top view of Figure 7 yes Figure 5 The enlarged view of the part in the dotted circle J; the left-right, up-down and other directions or positional relationships in this embodiment are based on the directions or positional relationships shown in the accompanying drawings. As shown in the figure:

[0032] The fountain experiment comparison display system provided in this embodiment includes an iron frame 1, a plurality of fountain experiment generating devices arranged on the iron frame 1, and a control mechanism for controlling the fountain experiment generating devices to synchronously perform fountain experiments. By using the control mechanism to synchronously control a plurality of fountain experiment generating devices filled with different gases to perform fountain experiments, the difference in solubility of different gases in water can be intuitively displayed according to the speed of the fountain experiment and the solution left in the final flask.

[0033] In this embodiment, the fountain experiment generating device includes a flask for containing gas, a beaker 22 for containing liquid, a catheter assembly for connecting the flask and the beaker 22, and a liquid injector 26. The bottle mouth of the flask is provided with a sealing plug 27. The iron frame 1 is provided with a bracket 11. The iron frame 1 is provided with a plurality of bracket 11 mounting holes. Multiple brackets 11 are installed to facilitate the construction of the overall system. The flask is invertedly mounted on the bracket 11 through a flask clamp. The beaker 22 is placed on the iron frame 1. The catheter assembly includes a catheter I 23, a catheter II 24, and a rubber tube connecting the catheter I 23 and the catheter II 24. The upper end of the catheter I 23 is inserted into the flask, and the lower end of the catheter II 24 extends into the beaker 22. The needle tube of the liquid injector 26 is inserted into the flask for injecting liquid into the flask.

[0034] The control mechanism includes a rubber tube synchronous clamping assembly 4 and a syringe synchronous pushing assembly 5, both of which are mounted on a bracket 11. After the flask is filled with gas and sealed, the whole system is built, the rubber tube synchronous clamping assembly 4 is kept to clamp the rubber tubes of different fountain experiment generating devices, and the conduit I 23 and the conduit II 24 are kept disconnected, and then the syringe synchronous pushing assembly 5 is used to synchronously inject an equal amount of water into the flasks of different fountain experiment generating devices to ensure that the type of gas is the only variable in the fountain experiment, and to reduce the error caused by the opening reaction time and the uneven volume of water to the experiment. After the water injection is completed, the rubber tube is synchronously released through the rubber tube synchronous clamping assembly 4, so that the conduit I 23 and the conduit II 24 are connected, so that different fountain experiment generating devices can perform fountain experiments at the same time. According to the speed of the fountain experiment and the solution left in the flask at the end, the difference in the solubility of different gases in water can be intuitively observed.

[0035] In this embodiment, a fountain experiment principle demonstration device is also included, which is arranged on the iron frame 1. The fountain experiment principle demonstration device is controlled by a control mechanism to perform a fountain experiment synchronously with the fountain experiment generating device.

[0036] The fountain experiment principle demonstration device includes a two-mouth flask 31 for containing gas, a beaker 22 for containing liquid, a catheter assembly for connecting the flask and the beaker 22, a liquid syringe 26 and a gas extraction syringe 32. The two bottle mouths of the two-mouth flask 31 are both provided with sealing plugs 27. The two-mouth flask 31 is invertedly mounted on the bracket 11 through a flask clamp. The beaker 22 is placed on the iron frame 1. The catheter assembly includes a catheter I 23, a catheter II 24 and a rubber tube connecting the catheter I 23 and the catheter II 24. The upper end of the catheter I 23 is inserted into the flask from the flask bottle mouth facing the beaker 22. At the same time, the needle tube of the liquid syringe 26 is also inserted into the flask from the bottle mouth. The lower end of the catheter II 24 extends into the beaker 22. The gas extraction syringe 32 is inserted from the other bottle mouth of the two-mouth flask 31 to extract the gas in the flask. The fountain experiment principle demonstration device is set up mainly to reveal the principle of the fountain experiment to students. Specifically, the experiment can be demonstrated in two ways: 1. A gas insoluble in water can be loaded into the two-mouth flask 31. After the control mechanism controls the liquid injector 26 to inject water into the flask and loosens the rubber tube, the fountain experiment can also be triggered by extracting the air in the flask through the gas extraction injector 32 inserted from the other bottle mouth of the flask. This is a physical fountain experiment, which can show that the fundamental principle of the fountain experiment is the pressure difference principle. By extracting different volumes of air, fountain phenomena of different degrees can be achieved, which can be compared with the chemical fountain experiment. 2. The same and equal amount of gas as that of one of the fountain experiment generating devices can be loaded into the two-mouth flask 31. The fountain experiment generating device and the fountain experiment principle demonstration device containing the same amount of the same gas can be synchronized to perform the fountain experiment through the control mechanism. During the experiment, the gas in the two-mouth flask 31 is extracted by the gas extraction injector 32 inserted in the other bottle mouth of the two-mouth flask 31 to reduce its internal pressure. It can be intuitively observed that the fountain experiment generating device and the fountain experiment principle demonstration device will produce different fountain phenomena. This comparison can also intuitively reflect that the essence of the fountain experiment is due to the gas pressure difference. The gas extraction injector 32 can be mounted on the bracket 11 of the iron frame 1 by means of a mounting clamp.

[0037] In this embodiment, the rubber tube synchronous clamping assembly 4 includes a housing Ⅰ41, a first clamping plate 42 and a second clamping plate 43 which are slidably disposed in the housing Ⅰ41, and the second clamping plate 43 is disposed parallel to and below the first clamping plate 42;

[0038] The first clamping plate 42 protrudes downward to form a plurality of first mounting blocks 42a, and the first mounting block 42a is provided with a first clamping block 42b perpendicular to the plane where the first mounting block 42a is located. The second clamping plate 43 protrudes upward to form a plurality of second mounting blocks 43a, and the second mounting block 43a is provided with a second clamping block 43b perpendicular to the plane where the second mounting block 43a is located. The housing Ⅰ41 is provided with a slide groove Ⅰ41a for the first clamping block 42b and the second clamping block 43b to extend out, and the first clamping block 42b and the second clamping block 43b slide relatively in the horizontal direction in the slide groove Ⅰ41a to achieve the clamping and loosening of the rubber tube. This arrangement can form multiple groups of clamping mechanisms that can be clamped and loosened synchronously. These clamping mechanisms are installed corresponding to different fountain experiment generating devices, so that the rubber tube can be clamped and loosened at the same time, and different fountain experiment generating devices can perform fountain experiments synchronously. The end surface of the first clamping block 42b and the end surface of the second clamping block 43b are preferably flat surfaces, and can fit each other during the horizontal sliding process to ensure that the rubber tube can be clamped.

[0039] In this embodiment, the left end of the first clamping plate 42 extends out from the housing Ⅰ41, and the right end of the second clamping plate 43 extends out from the housing Ⅰ41;

[0040] The first clamping plate 42 and the second clamping plate 43 are both installed with an anti-reverse clamp 6. The left end surface of the first clamping plate 42 is axially recessed to form a mounting groove for the anti-reverse clamp 6. The right end surface of the second clamping plate 43 is axially recessed to form a mounting groove for the anti-reverse clamp 6. The side wall of the mounting groove is provided with a through hole connected to the mounting groove. The anti-reverse clamp 6 includes a connecting rod 61 and an anti-reverse tooth 62 arranged on the side wall of the connecting rod 61. The connecting rod 61 is connected to the inner wall of the mounting groove by a spring 63. One end of the connecting rod 61 extends out of the mounting groove. The anti-reverse tooth 62 is slidably matched with the through hole and can be extended from the through hole. The inner wall of the shell Ⅰ41 is provided with a serrated groove matched with the anti-reverse tooth 62. When the first clamping plate 42 and / or the second clamping plate 43 need to slide, first pull the connecting rod 61 to pull the anti-reverse tooth 62 from the through hole back into the installation groove. When the first clamping plate 42 and / or the second clamping plate 43 slide to a predetermined position, such as a position that can just cooperate with each other to clamp or release the rubber tube, push the connecting rod 61, and cooperate with the spring 63 to push the anti-reverse tooth 62 out of the through hole. The anti-reverse tooth 62 can be inserted into the serrated groove set on the inner wall of the shell, thereby locking the position and preventing the first clamping plate 42 and / or the second clamping plate 43 from continuing to slide and affecting the experiment.

[0041] In this embodiment, the syringe synchronous pushing assembly 5 includes a shell II 51, a syringe clamping part arranged on the shell II 51 and a pushing part slidable up and down on the shell II 51. The pushing part includes a push rod 54 slidable up and down in the shell II 51 and a pushing block 55 arranged outside the shell II 51 and connected to the push rod 54. The two ends of the push rod 54 extend from both sides of the shell II 51. The shell II 51 is provided with a slide groove II 51b for the pushing block 55 to slide up and down. The pushing block 55 slides upward in the slide groove II 51b, pushing the piston rod of the liquid syringe 26 to move upward, and injecting liquid into the flask. A push rod 54 mounting hole is provided on the shell II 51 in the horizontal direction. After the push rod 54 is installed, the two ends of the push rod 54 extend from the two ends of the hole respectively. The push rod 54 can slide up and down in the mounting hole, driving the push block 55 to slide up and down; the push block 55 can be a whole piece or multiple pieces, which are arranged one by one corresponding to the position of the liquid syringe 26. During installation, the free ends of the piston rods of the liquid syringes 26 with the same amount of water on different fountain experiment generating devices are arranged above the push block 55, and the distance from the push block 55 is the same, for example, they can be directly attached to the upper surface of the push block 55. When water needs to be injected into the flask, the push rod 54 is pushed upward to drive the push block 55 to move upward, so as to achieve synchronous injection of the same amount of water into the flasks containing different gases. By setting the syringe clamp, it can be ensured that the syringe can remain stable when injecting liquid into the flask, so that the injection process can be carried out more smoothly, and the shaking of the liquid syringe 26 to cause uneven liquid volume to bring errors to the experiment is avoided.

[0042] In this embodiment, the syringe clamping member includes a third clamping plate 52 and a fourth clamping plate 53 which are slidably disposed in the housing II 51, and the fourth clamping plate 53 is disposed parallel to and below the third clamping plate 52.

[0043] The third clamping plate 52 protrudes downward to form a plurality of third mounting blocks 52a, and the third mounting block 52a is provided with a third clamping block 52b perpendicular to the plane where the third mounting block 52a is located. The fourth clamping plate 53 protrudes upward to form a plurality of fourth mounting blocks 53a, and the fourth mounting block 53a is provided with a fourth clamping block 53b perpendicular to the plane where the fourth mounting block 53a is located. The housing II51 is provided with a slide groove III51a for the third clamping block 52b and the fourth clamping block 53b to extend out. The end faces of the third clamping block 52b and the fourth clamping block 53b are both recessed inward to form a clamping opening, specifically, a clamping opening approximately in arc shape, which can better clamp the syringe barrel. The third clamping block 52b and the fourth clamping block 53b slide relative to each other in the horizontal direction in the slide groove III51a to clamp the syringe. The clamping structure similar to the rubber synchronous clamping assembly is adopted, and no new structure needs to be designed separately, and the operation is simple.

[0044] In this embodiment, the left end of the third clamping plate 52 extends out from the shell II 51, and the right end of the fourth clamping plate 53 extends out from the shell II 51;

[0045] The third clamping plate 52 and the fourth clamping plate 53 are both installed with an anti-reverse clamp 6. The left end surface of the third clamping plate 52 is axially recessed to form a mounting groove for the anti-reverse clamp 6. The right end surface of the fourth clamping plate 53 is axially recessed to form a mounting groove for the anti-reverse clamp 6. The side wall of the mounting groove is provided with a through hole connected to the mounting groove. The anti-reverse clamp 6 includes a connecting rod 61 and an anti-reverse tooth 62 arranged on the side wall of the connecting rod 61. The connecting rod 61 is connected to the inner wall of the mounting groove by a spring 63. One end of the connecting rod 61 extends out of the mounting groove. The anti-reverse tooth 62 is slidably matched with the through hole and can be extended from the through hole. The inner wall of the housing II 51 is provided with a serrated groove matched with the anti-reverse tooth 62. By setting the anti-reverse clamp 6, the relative positions of the third clamping plate 52 and the fourth clamping plate 53 can be locked, so as to better clamp the syringe.

[0046] In this embodiment, the back of the shell I41 and the shell II51 are both provided with a plurality of position-adjustable mounting parts. For example, a slide groove can be opened on the back, and the mounting parts can slide horizontally in the slide groove, slide to a predetermined position and then be locked in position by screws. They can be fixedly installed according to the actual placement of the experimental device.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A fountain experiment comparison display system, characterized by: It includes an iron frame, a plurality of fountain experiment generating devices arranged on the iron frame, and a control mechanism for controlling the fountain experiment generating devices to synchronously perform fountain experiments; The fountain experiment generating device comprises a flask for containing gas, a beaker for containing liquid, a catheter assembly for connecting the flask and the beaker, and a liquid syringe. A sealing plug is provided at the mouth of the flask. A bracket is provided on the iron stand. The flask is invertedly mounted on the bracket. The beaker is placed on the iron stand. The catheter assembly comprises a catheter I, a catheter II, and a rubber tube connecting the catheter I and the catheter II. The upper end of the catheter I is inserted into the flask, and the lower end of the catheter II is extended into the beaker. The needle of the liquid syringe is inserted into the flask to inject liquid into the flask. The control mechanism comprises a rubber tube synchronous clamping assembly and a syringe synchronous pushing assembly, and the rubber tube synchronous clamping assembly and the syringe synchronous pushing assembly are both mounted on a bracket; It also includes a fountain experiment principle display device arranged on the iron frame, and the fountain experiment principle display device is controlled by a control mechanism to perform a fountain experiment synchronously with the fountain experiment generating device; The fountain experiment principle demonstration device comprises a two-mouth flask for containing gas, a beaker for containing liquid, a catheter assembly for connecting the flask and the beaker, a liquid syringe and a gas extraction syringe. The two bottle mouths of the two-mouth flask are both provided with sealing plugs. The two-mouth flask is invertedly installed on a bracket, and the beaker is placed on an iron frame. The catheter assembly comprises a catheter I, a catheter II and a rubber tube connecting the catheter I and the catheter II. The upper end of the catheter I is inserted into the flask from the bottle mouth of the flask facing the beaker, and the needle of the liquid syringe is also inserted into the flask from the bottle mouth. The lower end of the catheter II extends into the beaker, and the gas extraction syringe is inserted from the other bottle mouth of the two-mouth flask to extract the gas in the flask. The rubber tube synchronous clamping and releasing assembly comprises a housing I, a first clamping plate and a second clamping plate which are slidably arranged in the housing I, and the second clamping plate is arranged parallel to and below the first clamping plate; The first clamping plate protrudes downward to form a plurality of first mounting blocks, the first mounting block is provided with a first clamping block perpendicular to the plane where the first mounting block is located, the second clamping plate protrudes upward to form a plurality of second mounting blocks, the second mounting block is provided with a second clamping block perpendicular to the plane where the second mounting block is located, the housing I is provided with a slide groove I for the first clamping block and the second clamping block to extend out, the first clamping block and the second clamping block slide relatively in the slide groove I along the horizontal direction to cooperate to achieve clamping and loosening of the rubber tube; The syringe synchronous pushing assembly includes a shell II, a syringe clamping part arranged on the shell II and a pushing part slidable up and down on the shell II. The pushing part includes a push rod slidable up and down in the shell II and a pushing block arranged outside the shell II and connected to the push rod. The two ends of the push rod extend from the two sides of the shell II. The shell II is provided with a slide groove II for the pushing block to slide up and down. The pushing block slides upward in the slide groove II to push the piston rod of the liquid syringe to move upward to inject liquid into the flask.

2. The fountain experiment comparison display system according to claim 1 is characterized in that: The left end of the first clamping plate extends out from the shell I, and the right end of the second clamping plate extends out from the shell I; Anti-reverse clamps are installed in both the first clamping plate and the second clamping plate. The left end surface of the first clamping plate is axially recessed to form a mounting groove for the anti-reverse clamp. The right end surface of the second clamping plate is axially recessed to form a mounting groove for the anti-reverse clamp. The side wall of the mounting groove is provided with a through hole connected to the mounting groove. The anti-reverse clamp includes a connecting rod and an anti-reverse tooth arranged on the side wall of the connecting rod. The connecting rod is connected to the inner wall of the mounting groove through a spring. One end of the connecting rod extends out of the mounting groove. The anti-reverse tooth slidably cooperates with the through hole and can extend out of the through hole. The inner wall of the shell I is provided with a serrated groove that cooperates with the anti-reverse tooth.

3. The fountain experiment comparison display system according to claim 1 is characterized in that: The syringe clamping member comprises a third clamping plate and a fourth clamping plate which are slidably arranged in the housing II, and the fourth clamping plate is arranged parallel to and below the third clamping plate; The third clamping plate protrudes downward to form a plurality of third mounting blocks, and the third mounting block is provided with a third clamping block perpendicular to the plane where the third mounting block is located. The fourth clamping plate protrudes upward to form a plurality of fourth mounting blocks, and the fourth mounting block is provided with a fourth clamping block perpendicular to the plane where the fourth mounting block is located. The shell II is provided with a slide groove III for the third clamping block and the fourth clamping block to extend out, and the end faces of the third clamping block and the fourth clamping block are both recessed inward to form a clamping opening, and the third clamping block and the fourth clamping block slide relative to each other in the horizontal direction in the slide groove III to achieve clamping of the syringe.

4. The fountain experiment comparison display system according to claim 3 is characterized by: The left end of the third clamping plate extends out from the shell II, and the right end of the fourth clamping plate extends out from the shell II; Anti-reverse clamps are installed in the third clamping plate and the fourth clamping plate. The left end surface of the third clamping plate is axially recessed to form a mounting groove for the anti-reverse clamp. The right end surface of the fourth clamping plate is axially recessed to form a mounting groove for the anti-reverse clamp. The side wall of the mounting groove is provided with a through hole connected to the mounting groove. The anti-reverse clamp includes a connecting rod and an anti-reverse tooth arranged on the side wall of the connecting rod. The connecting rod is connected to the inner wall of the mounting groove through a spring. One end of the connecting rod extends out of the mounting groove. The anti-reverse tooth slidably cooperates with the through hole and can extend out of the through hole. The inner wall of the shell II is provided with a serrated groove that cooperates with the anti-reverse tooth.

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