Physical lever principle demonstration device

Abstract

The utility model relates to the technical field of physical experiment demonstration, and discloses a physical lever principle demonstration device, which comprises a vertical rod, the upper part of the vertical rod is movably sleeved with an angle measuring plate, an arc-shaped groove is arranged in the angle measuring plate, and a limiting pin is arranged in the arc-shaped groove. According to the physical lever principle demonstration device, the sliding block extends into the cross rod, the friction resistance during rotation of the mounting base is reduced through the bearing, after the position of the cross rod is adjusted, the position of the scale rope in the cross rod is adjusted, and the scale groove outside the scale rope is observed, namely after the placement positions of the bearing blocks on the two sides of the cross rod are adjusted, the position of the scale rope is adjusted. The proportion of the two sets of bearing blocks can be observed conveniently, in the demonstration process of different proportions of the lever principle, the observation convenience during adjustment is improved, and the situation that after the position of the transverse rod is adjusted, the position of the scale groove deviates, the proportion of the two sets of bearing blocks is difficult to observe, and the demonstration effect is affected is avoided.

Description

Technical Field

[0001] This utility model relates to the field of physical experiment demonstration technology, specifically a physical lever principle demonstration device. Background Technology

[0002] In high school physics, the lever principle is an important theorem: effort multiplied by effort arm equals assistance multiplied by assistance arm. However, through simple text and formula teaching, students often do not have a thorough understanding of this formula and lack intuitive understanding, which is very detrimental to mastering the lever theorem. Therefore, lever principle demonstration devices are used to extend the lever principle.

[0003] Typically, load-bearing blocks of varying proportions are installed on both sides of a horizontal bar, and the lever principle can be demonstrated by observing the degree of tilt of the bar. However, when installing load-bearing blocks at different proportions, the position of the horizontal bar needs to be adjusted. But when the position of the horizontal bar is adjusted, the position of the scale grooves engraved on the horizontal bar shifts. After the scale grooves shift, it is difficult to accurately observe the distance ratio between the scale blocks at both ends of the horizontal bar. This makes it difficult to control the weight placement of the load-bearing blocks when demonstrating the principle of the steel pipe principle, thus affecting the demonstration effect. Therefore, we propose a physical lever principle demonstration device. Utility Model Content

[0004] To address the shortcomings of existing physical lever principle demonstration devices, this utility model provides a physical lever principle demonstration device. It features an adjustable horizontal bar at the front end of a protractor, allowing for simultaneous adjustment of the angle of the graduated rope inside the horizontal bar. Specifically, the center of the graduated groove on the outside of the graduated rope can be moved to the center of the front end of the protractor. This allows for precise and rapid observation of the proportions between the load-bearing blocks when the horizontal bar's position shifts, thus solving the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: a physical lever principle demonstration device, including a vertical rod, a protractor movably sleeved on the upper part of the vertical rod, an arc-shaped groove opened inside the protractor, a limit pin installed inside the arc-shaped groove, a mounting seat installed inside the protractor through a bearing, a slider movably sleeved on the front end of the mounting seat, a horizontal rod movably sleeved on the outside of the slider, and a graduated rope movably sleeved inside the front end of the horizontal rod.

[0006] Preferably, the lower end of the vertical rod is hinged to a base, which is placed on a table. At the same time, diagonal rods are installed on both sides of the vertical rod, and the other side of the diagonal rod is installed on the upper part of the base.

[0007] Preferably, the limiting pin includes a limiting post, wherein the limiting post is installed inside the arc-shaped groove, and a spring and a washer are sleeved on the rear end of the limiting post, and the washer is fitted to the rear end of the protractor.

[0008] Preferably, the lower part of the protractor is fixedly connected to an arc-shaped plate, a fastening bolt is installed inside the front end of the vertical rod, the protractor has a groove inside, the arc-shaped plate is sleeved inside the groove, and the fastening bolt is fitted to the front end of the arc-shaped plate.

[0009] Preferably, the slider is fitted to the front end of the protractor, and a screw is fixedly connected to the rear end of the slider.

[0010] Preferably, a load-bearing block adjustment seat is sleeved on the outside of the crossbar, and a hook is fixedly connected to the lower end of the load-bearing block adjustment seat. A sliding groove is opened on the outside of the crossbar, and the load-bearing block adjustment seat is sleeved inside the sliding groove.

[0011] Preferably, the inside of the graduated rope and the outside of the protractor are provided with graduated grooves, and two sets of limiting pins are provided, with the limiting pins located on both sides of the upper part of the crossbar.

[0012] Compared with existing physical lever principle demonstration devices, this utility model has the following advantages:

[0013] 1. This physics lever principle demonstration device extends the slider into the interior of the horizontal bar. Simultaneously, the bearing reduces frictional resistance during the rotation of the mounting base. After adjusting the position of the horizontal bar and the position of the graduated rope inside the bar, the graduated grooves on the outside of the rope can be observed. This adjustment of the weight blocks on both sides of the horizontal bar facilitates observation of the proportions of the two sets of weight blocks. This improves the ease of observation during adjustments when demonstrating different proportions of the lever principle, preventing the graduated grooves from shifting after the horizontal bar position is adjusted, which would make it difficult to observe the proportions between the two sets of weight blocks and thus affect the demonstration effect.

[0014] 2. This physics demonstration device using the lever principle allows for adjustment of the vertical rod's tilt angle by extending and retracting the diagonal rod. Simultaneously, it adjusts the position of the curved plate inside the vertical rod, ensuring the lateral angle of the protractor is adjusted. This ensures stability during protractor angle adjustment and improves extension accuracy. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0016] Figure 2 This is a front view structural diagram of the present invention;

[0017] Figure 3 This is a schematic cross-sectional view of the main body of this utility model;

[0018] Figure 4 This is an enlarged schematic diagram of the limiting structure of this utility model;

[0019] Figure 5 This is an enlarged structural diagram of point A in this utility model;

[0020] Figure 6 This is an enlarged structural diagram of section B of the present invention.

[0021] In the diagram: 1. Vertical rod; 2. Hinge; 3. Base; 4. Diagonal rod; 5. Protractor; 6. Curved plate; 7. Fastening bolt; 8. Curved groove; 9. Limit pin; 91. Limit post; 92. Spring; 93. Washer; 10. Bearing; 11. Mounting base; 12. Slider; 13. Horizontal rod; 14. Screw; 15. Scale rope; 16. Load-bearing block adjustment seat; 17. Hook. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 A physical lever principle demonstration device includes a vertical rod 1, with a protractor 5 movably sleeved on the upper part of the vertical rod 1. An arc-shaped groove 8 is formed inside the protractor 5, and a limit pin 9 is installed inside the arc-shaped groove 8. Adjusting the angle of the limit pin 9 adjusts its position outside the arc-shaped groove 8. Simultaneously, the limit pin 9 is positioned on the upper part of a horizontal rod 13, limiting the maximum trajectory of the horizontal rod 13. A mounting seat 11 is installed inside the protractor 5 via a bearing 10, reducing frictional resistance during rotation. A slider 12 is movably sleeved at the front end of the mounting seat 11. Adjusting the position of the slider 12 at the rear end of the horizontal rod 13 allows for adjustment of the horizontal position of the horizontal rod 13 above the vertical rod 1. The horizontal rod 13 is movably sleeved outside the slider 12, and a graduated rope 15 is movably sleeved inside the front end of the horizontal rod 13. Adjusting the graduated rope 15 and observing the graduated groove allows for control of the ratio between the weight blocks placed at both ends.

[0024] Please see Figure 3The lower end of the vertical rod 1 is connected to a base 3 via a hinge 2. The base 3 is placed on a table. At the same time, diagonal rods 4 are installed on both sides of the vertical rod 1. The other side of the diagonal rod 4 is installed on the upper part of the base 3. The length of the arc plate 6 is adjusted by telescopic adjustment, and the angle of the vertical rod 1 on the upper part of the base 3 is also adjusted. That is, the protractor 5 adjusts the support angle of the vertical rod 1 to ensure the stability of the equipment during installation and placement and the convenience of angle adjustment.

[0025] Please see Figure 1 and Figure 4 The limiting pin 9 includes a limiting post 91, which is installed inside the arc-shaped groove 8. A spring 92 and a washer 93 are sleeved at the rear end of the limiting post 91. The washer 93 is fitted to the rear end of the protractor 5 and installed inside the arc-shaped groove 8 via the limiting pin 9. At the same time, the washer 93 is fitted to the rear end of the protractor 5. Adjusting the position of the limiting post 91 inside the protractor 5, the washer 93 is pushed forward by the elastic action of the spring 92 to ensure that the limiting post 91 is tightly installed inside the protractor 5. The limiting post 91 can limit the movable trajectory of the crossbar 13 when it is tilted, so as to avoid the tilt of the crossbar 13 being too large and affecting the teaching effect.

[0026] Please see Figure 2 An arc-shaped plate 6 is fixedly connected to the lower part of the protractor 5. A fastening bolt 7 is installed inside the front end of the vertical rod 1. A groove is opened inside the protractor 5, and the arc-shaped plate 6 is fitted inside the groove. The fastening bolt 7 is fitted to the front end of the arc-shaped plate 6. By adjusting the position of the arc-shaped plate 6 inside the vertical rod 1 and rotating the fastening bolt 7, the protractor 5 is moved to a horizontal plane and parallel to the horizontal plane. This prevents the protractor 5 from deflecting and makes it difficult to accurately observe the tilt of the horizontal rod 13.

[0027] Please see Figure 5 The slider 12 is fitted to the front end of the protractor 5, and the rear end of the slider 12 is fixedly connected to the screw 14. The front end of the screw 14 is installed at the rear end of the scale rope 15. At the same time, the slider 12 is sleeved inside the crossbar 13. When the crossbar 13 is pushed to one side, the position of the scale rope 15 inside the crossbar 13 is adjusted according to the different positions of the center of the front end of the protractor 5 to ensure that the center area of ​​the front end of the scale rope 15 is aligned with the protractor 5. By observing the scale inside the scale rope 15, the ratio between the two weights can be observed, which improves the demonstration effect of the physical lever principle. The screw 14 extends into the interior of the mounting base 11. Rotating the nut installed at the rear end of the screw 14 drives the slider 12 to maintain stability when it is installed at the front end of the mounting base 11. At the same time, the bearing 10 reduces the frictional resistance when the crossbar 13 rotates.

[0028] Please see Figure 6A load-bearing block adjustment seat 16 is sleeved on the outside of the crossbar 13. A hook 17 is fixedly connected to the lower end of the load-bearing block adjustment seat 16. A sliding groove is opened on the outside of the crossbar 13, and the load-bearing block adjustment seat 16 is sleeved inside the sliding groove. By installing the load-bearing block adjustment seat 16 on the outside of the crossbar 13, the position of the load-bearing block adjustment seat 16 can be adjusted. At the same time, a load is hung on the outside of the hook 17, which can demonstrate the lever principle.

[0029] Please see Figure 5 The inside of the graduated rope 15 and the outside of the protractor 5 are provided with graduated grooves. Two sets of limiting pins 9 are provided. The limiting pins 9 are located on both sides of the upper part of the crossbar 13. By observing the graduated grooves inside the graduated rope 15 and outside the protractor 5, the distance ratio between the two weights can be observed. At the same time, the limiting pins 9 are located at the upper end of the crossbar 13 and adjust the deflection angle of the crossbar 13.

[0030] Working principle: During use, depending on the required demonstration ratio based on the lever principle, the position of the horizontal bar 13 outside the slider 12 is adjusted to move the horizontal bar 13 to the side. At the same time, the scale rope 15 is rotated, and the center of the scale rope 15 moves to the front end of the protractor 5. The tilt angle of the vertical bar 1 and the angle of the protractor 5 are adjusted to ensure that the protractor 5 remains parallel to the horizontal plane. Meanwhile, the position of the load-bearing block adjustment seat 16 outside the horizontal bar 13 is adjusted to control the ratio of the two sets of load-bearing block adjustment seats 16 on both sides of the protractor 5. At the same time, load-bearing blocks of different weights are hung on the upper part of the hook 17 to demonstrate the principle of the material steel pipe.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A physical lever principle demonstration device, comprising a vertical rod (1), the upper part of the vertical rod (1) is movably sleeved with a protractor (5), the inside of the protractor (5) is provided with an arc-shaped slot (8), characterized in that: The inside of the arc-shaped slot (8) is mounted with a limiting pin (9), the inside of the protractor (5) is mounted with a mounting base (11) through a bearing (10), the front end of the mounting base (11) is movably sleeved with a sliding block (12), the outside of the sliding block (12) is movably sleeved with a cross rod (13), and the inside of the front end of the cross rod (13) is movably sleeved with a scale rope (15).

2. A physical demonstration device of the principle of lever according to claim 1, characterized in that: The lower end of the vertical rod (1) is mounted with a base (3) through a hinge (2), the base (3) is placed on the desktop, and the two sides of the vertical rod (1) are mounted with inclined rods (4), and the other side of the inclined rod (4) is mounted on the upper part of the base (3).

3. The physical demonstration device of claim 1, wherein: The limiting pin (9) comprises a limiting column (91), wherein the limiting column (91) is mounted in the inside of the arc-shaped slot (8), the rear end of the limiting column (91) is sleeved with a spring (92) and a gasket (93), and the gasket (93) is mounted at the rear end of the protractor (5).

4. The physical demonstration device of claim 1, wherein: The lower part of the protractor (5) is fixedly connected with an arc-shaped plate (6), the inside of the front end of the vertical rod (1) is mounted with a fastening bolt (7), the inside of the protractor (5) is provided with a groove, the arc-shaped plate (6) is sleeved in the inside of the groove, and the fastening bolt (7) is mounted at the front end of the arc-shaped plate (6).

5. The physical demonstration device of claim 1, wherein: The sliding block (12) is mounted at the front end of the protractor (5), and the rear end of the sliding block (12) is fixedly connected with a screw rod (14).

6. The physical demonstration of the principle of leverage device according to claim 1, characterized in that: The outside of the cross rod (13) is sleeved with a bearing block adjusting seat (16), the lower end of the bearing block adjusting seat (16) is fixedly connected with a hook (17), the outside of the cross rod (13) is provided with a sliding groove, and the bearing block adjusting seat (16) is sleeved in the inside of the sliding groove.

7. The physical demonstration device of claim 1, wherein: The inside of the scale rope (15) and the outside of the protractor (5) are provided with scale grooves, the limiting pin (9) is provided with two groups, and the limiting pin (9) is arranged on the two sides of the upper part of the cross rod (13).

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