Visual demonstration teaching aid for overweight and weightlessness

Abstract

The utility model discloses an overweight and weightlessness visual demonstration teaching aid which comprises a base, a lifting frame and a pulley mounting frame, and the base, the lifting frame and the pulley mounting frame are all made of aluminum strips and are all arranged in a hollowed-out mode. According to the demonstration teaching aid, the intelligent displays are arranged at the two ends of the base, force-time oscillogram of overweight and weightlessness can be displayed at the same time, overweight and weightlessness experiments do not need to be demonstrated separately, students can visually observe the weightlessness and overweight phenomena, and exploration and verification of physical laws are facilitated; the hollow cube-shaped movable box body is arranged, so that life experience and experimental phenomena are combined, and the understanding of physical laws is deepened; a lifting guide rail is arranged on the movable box body, so that stable lifting of the movable box body is ensured, and the accuracy of experimental numbers is ensured; in addition, the demonstration teaching aid is closed, and the supporting frame is made of aluminum strips and is hollowed out, so that the movable box body is stable and does not shake during an experiment, and the demonstration teaching aid is light and convenient to carry.

Description

Technical Field

[0001] The utility model relates to a teaching device, in particular to a visual demonstration teaching aid for overweight and weightlessness. Background Art

[0002] The phenomena of overweight and weightlessness have long been concerned and utilized in life. In high school physics teaching, overweight and weightlessness are also the key points and difficulties in teaching. Overweight means that the pressure of an object on a support is greater than its own gravity. When an object accelerates upward or decelerates downward, the object is in an overweight state. Weightlessness means that the pressure of an object on a support is less than its own gravity. When an object decelerates upward or accelerates downward, the object is in a weightless state. It is difficult for teachers to clearly and accurately describe and explain the "overweight and weightlessness phenomena" in classroom teaching; it is also difficult for students to understand the relevant factors affecting overweight and weightlessness, thus making it difficult to grasp the essence and variation law of the overweight and weightlessness phenomena. The main reason for such problems is that there is currently no applicable experimental teaching aid in middle school physics teaching that can intuitively and comprehensively demonstrate the "overweight and weightlessness phenomena", nor is there a teaching instrument that can accurately measure "overweight and weightlessness". The traditional overweight and weightlessness demonstrator suspends a so-called memory spring scale on a bracket and displays data through this spring scale. The accuracy of data recorded by this spring scale is poor, and the experimental phenomenon is not obvious; therefore, it can only achieve a poor demonstration function and roughly explain the factors affecting overweight and weightlessness.

[0003] The utility model with the publication number of CN214253581U discloses a digital overweight and weightlessness experiment instrument, including: a main frame body, a mounting seat, a pulley mounting frame, a pulley group, a connecting thin wire, a weight group and a digital tension scale; the first pulley and the second pulley are mounted on the pulley mounting frame; the connecting thin wire is lapped on the first pulley and the second pulley, one end of which is connected to a weight, and the other end is connected to the connecting end of the digital tension scale, and the hook end of the digital tension scale is connected to a weight. Although this experiment instrument is provided with a digital tension scale to realize the digitization of force, there are still the following problems: First, only one digital tension scale is set, and only the pressure received by the object on one side can be displayed, so weightlessness or overweight cannot be recorded simultaneously, and the weightlessness and overweight experiment numbers have to be recorded separately, that is, the separate demonstration of the overweight and weightlessness experiments. Moreover, the digital tension scale can only record numbers and cannot display the waveform diagram of the force changing with time, and it is impossible to intuitively feel the force change during weightlessness and overweight; Second, the weight group directly rises and falls through the connecting thin wire, and there is no lifting guide rail. When the weight group rises or falls, it is easy to shake, resulting in errors in the experimental numbers; Third, the weight group is directly used for the overweight and weightlessness experiment, while the overweight and weightlessness in life mainly come from elevators. Therefore, the experiment cannot be combined with life experience, and it is not easy to understand the overweight and weightlessness phenomena; In addition, the structure of this experiment instrument is not enclosed. On the one hand, it is not convenient to carry and organize, and on the other hand, it is easy to sway during the demonstration, affecting the accuracy of the experiment. Summary of the Utility Model

[0004] In view of the deficiencies of the prior art, the utility model provides a visual demonstration teaching aid for overweight and weightlessness. By setting intelligent displays at both ends of the base, the visual demonstration teaching aid can simultaneously display the force-time waveform diagrams of overweight and weightlessness, not only eliminating the need to separately demonstrate the overweight and weightlessness experiments, but also enabling students to intuitively observe the phenomena of weightlessness and overweight, which is conducive to exploring and verifying physical laws. An activity box in the shape of a hollow cube is provided to combine life experience with experimental phenomena and deepen the understanding of physical laws. A lifting guide rail is arranged on the activity box to ensure the stable lifting of the activity box, thereby ensuring the accuracy of experimental data. In addition, the visual demonstration teaching aid is enclosed, and the support frame is made of aluminum strips and is hollowed out, further ensuring the stability of the activity box during the experiment without wobbling, and being light and convenient to carry.

[0005] In order to achieve the above object, the technical solution adopted by the utility model is as follows:

[0006] A visual demonstration teaching aid for overweight and weightlessness, comprising an I-shaped base, a lifting frame vertically arranged on the base, and a pulley mounting frame vertically arranged at the top of the lifting frame. The base, the lifting frame, and the pulley mounting frame are all made of aluminum strips and are all hollowed out. Guide rail rod mounting plates are symmetrically arranged at both ends of the base, and a plurality of lifting guide rail rods are arranged on each of the two guide rail rod mounting plates. The lifting guide rail rods are all arranged parallel to the lifting frame and are all connected to the pulley mounting frame at the top. A lifting movable body that can move up and down along it is sleeved on each side of the lifting guide rail rods. The lifting movable body includes an activity box connected to the lifting guide rail rods through sliders. The activity box is in the shape of a hollow cube and is detachably arranged. Four ends of the activity box are connected with counterweight support plates through connecting pieces. Vertical counterweight placing rods are arranged on the counterweight support plates. A pressure sensor and weights are sequentially arranged from bottom to top in one activity box, and a tension sensor and weights are sequentially arranged from top to bottom in the other activity box. Connecting hooks are arranged at the center of the top of the activity box, and a connecting rope is arranged between the two connecting hooks. The lifting frame is located on the central axis of symmetry between the two lifting movable bodies, and the lifting frame is composed of a plurality of nested lifting rods. Intelligent displays are arranged on the front sides of both ends of the base, and each side of the intelligent display is connected to the corresponding sensor. The pulley mounting frame is arranged in the shape of a hollow cuboid. Two pulley fixing platforms are symmetrically arranged on both sides inside the pulley mounting frame with the lifting frame as the center. A pulley is fixed on each of the two pulley fixing platforms, and both pulleys are wound with the connecting rope.

[0007] As a preferred technical solution, in order to prevent the lifting movable body from colliding when rising to the highest point or falling to the lowest point, effectively preventing the lifting movable body from being damaged or the sensors and weights inside it from falling, movable body limiting plates connected to the lifting guide rail rods are symmetrically arranged on both sides of the bottom end of the pulley mounting frame, and buffer pads are arranged on both the two movable body limiting plates and the two guide rail rod mounting plates.

[0008] As a preferred technical solution, in order to facilitate the storage and arrangement of the entire device, and at the same time ensure that the lifting movable body can lift or fall within a certain height range to ensure that the complete overweight and weightlessness phenomena can be observed, the lifting range of the lifting frame is 45 cm to 135 cm. Then the length after storage is 45 cm, and when extended to the highest height is 135 cm. If the lifting range is set too long, the volume is large and it occupies space; if the lifting range is set too short, it will affect the demonstration and observation of the overweight and weightlessness experiments.

[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0010] 1. By setting intelligent displays at both ends of the base, this demonstration teaching aid can simultaneously display the force-time waveform diagrams of overweight and weightlessness. It not only eliminates the need to separately demonstrate the overweight and weightlessness experiments, but also enables students to intuitively observe the overweight and weightlessness phenomena, which is conducive to exploring and verifying physical laws; setting an activity box in the shape of a hollow cube realizes the combination of life experience and experimental phenomena, deepening the understanding of physical laws; setting lifting guide rails on the activity box ensures the stable lifting of the activity box, thereby ensuring the accuracy of experimental data. In addition, this demonstration teaching aid is enclosed, and the support frame is made of aluminum strips and is hollowed out, further ensuring the stability of the activity box during the experiment without shaking, and being light and easy to carry.

[0011] 2. On both sides of the bottom end of the pulley mounting frame, there are symmetrically arranged movable body limit plates connected to the lifting guide rail rods. Buffer pads are provided on both limit plates and on the two guide rail rod mounting plates, effectively preventing the lifting movable body from colliding when rising to the highest point or falling to the lowest point, and further preventing the lifting movable body from being damaged or the sensors and weights inside from falling.

[0012] 3. The lifting range of the lifting frame is 45 cm to 135 cm, which makes the entire device easy to store and organize, and at the same time ensures that the lifting movable body can lift or fall within a certain height range to ensure that the complete overweight and weightlessness phenomena can be observed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0014] Figure 1 is a structural schematic diagram of the present utility model;

[0015] Figure 2 is an axonometric view of the present utility model;

[0016] Reference numerals: 1, base; 2, lifting frame; 3, pulley mounting bracket; 4, guide rail rod mounting plate; 5, lifting guide rail rod; 6, lifting movable body, 6-1, movable box body, 6-2, connecting member, 6-3, counterweight support plate, 6-4, counterweight placement plate rod, 6-5, counterweight; 7, slider; 8, pressure sensor; 9, weight; 10, tension sensor; 11, connecting hook; 12, connecting rope; 13, intelligent display; 14, pulley fixing table; 15, pulley; 16, movable body limiting plate; 17, buffer pad. Detailed implementation manner

[0017] Such as Figure 1The following presents a specific embodiment of the present utility model, an overweight and weightlessness visualization demonstration teaching aid, which includes an I-shaped base 1, a lifting frame 2 vertically arranged on the base 1, and a pulley mounting frame 3 vertically arranged at the top of the lifting frame 2. The base 1, the lifting frame 2, and the pulley mounting frame 3 are all made of aluminum strips and are all provided with hollow settings; both ends of the base 1 are symmetrically provided with guide rail rod mounting plates 4, and several lifting guide rails 5 are provided on each of the two guide rail rod mounting plates 4. To ensure the stability of the lifting guide rails 5, in this embodiment, the lifting guide rails 5 are carbon fiber rods. The lifting guide rails 5 are all arranged parallel to the lifting frame 2 and are all connected to the pulley mounting frame 3 at the top. Then the lifting guide rails 5 are vertically arranged on the guide rail rod mounting plates 4. On the premise of ensuring stable lifting, for the sake of simple production and reduced manufacturing costs, in this embodiment, two lifting guide rails 5 are provided on each guide rail rod mounting plate 4. And to ensure the stability of the lifting guide rails 5 and facilitate the lifting of the lifting frame 2, in this embodiment, the bottom ends of the lifting guide rails 5 penetrate through the base 1 and the top ends penetrate through the pulley mounting frame 3. A lifting movable body 6 that can move up and down along it is sleeved on each side of the lifting guide rails 5. Then the two lifting movable bodies 6 are symmetrically arranged on both sides of the lifting frame 2 and can slide up and down between the pulley mounting frame 3 and the base 1. The lifting movable body 6 includes a movable box body 6-1 connected to the lifting guide rail 5 through a slider 7. To meet the requirement that the lifting guide rail 5 can pass through different positions of the movable box body 6-1 and facilitate the lifting adjustment of the movable box body 6-1, in this embodiment, a reserved hole for the lifting guide rail 5 is opened on the movable box body 6-1. The movable box body 6-1 is in a hollow cube shape and is detachably arranged. For the convenience of processing and manufacturing and better simulating the most common elevator overweight and weightlessness phenomena in life, in this embodiment, the movable box body 6-1 is in a hollow cuboid shape, and each adjacent side of the movable box body 6-1 is detachable. Four ends of the movable box body 6-1 are connected with a counterweight support plate 6-3 through a connecting member 6-2. A vertically arranged counterweight placing rod 6-4 is provided on the counterweight support plate 6-3. To ensure the firm connection between the movable box body 6-1 and the counterweight support plate 6-3, in this embodiment, the connecting member 6-2 is a stud with a protective sleeve, and the counterweight placing rod 6-4 is a stud. A pressure sensor 8 and weights 9 are sequentially arranged from bottom to top in one movable box body 6-1, and a tension sensor 10 and weights 9 are sequentially arranged from top to bottom in the other movable box body 6-1. In this embodiment, a pressure sensor 8 is arranged in the left movable box body 6-1 and a tension sensor 10 is arranged in the right movable box body 6-1. And the tension sensor 10 is connected to the weights 9 through a hook. Connecting hooks 11 are provided at the center of the top ends of the movable box bodies 6-1. A connecting rope 12 is arranged between the two connecting hooks 11;The lifting frame 2 is located on the central axis symmetry line of the two lifting bodies 6, and the lifting frame 2 is composed of a number of nested lifting rods. On the premise of ensuring clear observation of the overweight and weightlessness phenomena, for the convenience of storage and handling, as well as installation, manufacturing and low manufacturing cost, in this embodiment, the lifting frame 2 is composed of two nested lifting rods, and the two nested lifting rods are fixed by a fixing member in an X shape. On the front sides of both ends of the base 1, an intelligent display 13 is provided. Each intelligent display 13 is connected to the corresponding sensor. Specifically, the left intelligent display 13 is connected to the pressure sensor 8, and the right intelligent display 13 is connected to the tension sensor 10. The intelligent display 13 is used to display the force-time waveform diagram; the pulley mounting frame 3 is arranged in a hollow cuboid shape. For the convenience of installation and disassembly, as well as balance adjustment, in this example, the adjacent surfaces of the lifting frame 2 are all detachable. On both sides inside the pulley mounting frame 3, two pulley fixing platforms 14 are symmetrically arranged with the lifting frame 2 as the center. A pulley 15 is fixed on each of the two pulley fixing platforms 14, and the two pulleys 15 are both wound by a connecting rope 12, as shown in; Figure 2 As shown, the two lifting bodies can rise or fall along with the connecting rope under the action of the gravity difference.

[0018] On both sides of the bottom end of the pulley mounting frame 3, movable body limit plates 16 connected to the lifting guide rods 5 are symmetrically provided. Buffer pads 17 are provided on both the two movable body limit plates 16 and the two guide rod mounting plates 4, effectively preventing the lifting bodies 6 from colliding when rising to the highest point or falling to the lowest point, thereby preventing the lifting bodies 6 from being damaged or the sensors and weights inside them from falling.

[0019] The lifting range of the lifting frame 2 is 45 cm to 135 cm. After being stored, the length of the lifting frame is 45 cm, and the maximum extended height is 135 cm. If the lifting range of the lifting frame 2 is set too long, it will be large in volume and occupy space. If the lifting range of the lifting frame 2 is set too short, it will affect the demonstration and observation of the overweight and weightlessness experiment. Setting the lifting range of the lifting frame 2 to 45 cm to 135 cm makes the whole device convenient for storage and arrangement, and at the same time ensures that the lifting bodies 6 can rise or fall within a certain height range, ensuring that the complete overweight and weightlessness phenomena can be observed.

[0020] When the utility model is in use: Fix the demonstration instrument on a horizontal tabletop, hang the weights 9 on the tension sensor 10 respectively and place them on the pressure sensor 8. Connect the data lines of the tension sensor 10 and the pressure sensor 8 to the intelligent displays 13 on the left and right sides. Turn on the power switches of the intelligent displays 13 on the left and right sides. At this time, the intelligent displays 13 on both sides respectively display the readings of the tension sensor 10 and the pressure sensor 8 in the static state. Lift the left movable box body 6-1 to the highest position at the top and place the counterweight 6-5 on its counterweight placing rod plate 6-4. After the readings of the intelligent displays 13 on the left and right sides are stable, release the left movable box body 6-1 from rest. At this time, the left movable box body 6-1 is in a state of weightlessness, and the right movable box body 6-1 is in a state of overweight. Then, due to the state of weightlessness, the pressure of the weight 9 on the pressure sensor 8 decreases as the height decreases. Due to the state of overweight, the tension of the weight 9 on the tension sensor 10 increases as the height of the rise increases. The numerical changes of the pressure sensor 8 and the tension sensor 10 will be displayed on the intelligent displays 13 on the left and right sides through the data lines. In this way, students can directly observe the change rules of pressure and tension during overweight and weightlessness. At the same time, the intelligent display 13 can also represent the numerical changes of the pressure sensor 8 and the tension sensor 10 with a waveform diagram, so that the change curve rules of pressure and tension can be observed from the graph. This cannot be achieved by traditional overweight and weightlessness demonstration instruments.

[0021] Of course, the above only describes in detail the preferred specific implementation mode of the utility model in combination with the drawings, and does not limit the implementation scope of the utility model hereby. Any equivalent changes made according to the principle, structure and construction of the utility model shall be covered within the protection scope of the utility model.

Claims

1. Visual demonstration teaching aid for overweight and weightlessness, characterized in that: It includes a base (1) in the shape of an I-beam, a lifting frame (2) vertically arranged on the base (1), and a pulley mounting frame (3) vertically arranged at the top of the lifting frame (2). The base (1), the lifting frame (2), and the pulley mounting frame (3) are all made of aluminum bars and are all hollow. At both ends of the base (1), guide rail rod mounting plates (4) are symmetrically arranged. A number of lifting guide rails (5) are arranged on each of the two guide rail rod mounting plates (4). The lifting guide rails (5) are all arranged parallel to the lifting frame (2) and are all connected to the pulley mounting frame (3) at the top. A lifting movable body (6) that can move up and down along it is sleeved on each side of the lifting guide rail (5). The lifting movable body (6) includes a movable box body (6-1) connected to the lifting guide rail (5) through a slider (7). The movable box body (6-1) is in the shape of a hollow cube and is detachably arranged. At the four ends of the movable box body (6-1), a counterweight support plate (6-3) is connected through a connecting piece (6-2). A vertically arranged counterweight placing rod (6-4) is arranged on the counterweight support plate (6-3). A pressure sensor (8) and a weight (9) are successively arranged from bottom to top in one movable box body (6-1). A tension sensor (10) and a weight (9) are successively arranged from top to bottom in the other movable box body (6-1). Connecting hooks (11) are arranged at the centers of the tops of the movable box bodies (6-1). A connecting rope (12) is arranged between the two connecting hooks (11). The lifting frame (2) is located on the central axis of symmetry of the two lifting movable bodies (6), and the lifting frame (2) is composed of a number of nested lifting rods. On the front sides of both ends of the base (1), an intelligent display (13) is arranged. Each side of the intelligent display (13) is connected to the corresponding sensor. The pulley mounting frame (3) is arranged in the shape of a hollow cuboid. On both sides inside the pulley mounting frame (3), two pulley fixing platforms (14) are symmetrically arranged with the lifting frame (2) as the center. A pulley (15) is fixed on each of the two pulley fixing platforms (14). The two pulleys (15) are both wound by the connecting rope (12).

2. The visual demonstration teaching aid for overweight and weightlessness according to claim 1, characterized in that: On both sides of the bottom end of the pulley mounting frame (3), movable body limiting plates (16) connected to the lifting guide rails (5) are symmetrically arranged. Buffer pads (17) are arranged on both the two movable body limiting plates (16) and the two guide rail rod mounting plates (4).

3. The visual demonstration teaching aid for overweight and weightlessness according to claim 1 or 2, characterized in that: The lifting range of the lifting frame (2) is 45 cm to 135 cm.

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