Electromagnetic demonstration instrument for high school physics teaching

Abstract

This application relates to the field of teaching aids and discloses an electromagnetic demonstrator for high school physics teaching, comprising: a base; two upright plates, installed vertically and parallel to the center of the top surface of the base along its length; three sets of pendulum assemblies, their tops suspended from the top of the upright plates by support rods; and three sets of magnetic field assemblies located below each set of pendulum assemblies to generate the magnetic field required for the demonstration. This application enables multi-scenario comparative demonstrations using three different types of aluminum pendulums, helping students intuitively understand the influence of materials and structures on electromagnetic induction phenomena, enhancing the relevance of teaching. The leveling mechanism precisely adjusts the base's horizontality, the silicone suction cup improves placement stability, and the adjusting plate limits the pendulum's swing angle, ensuring experimental accuracy and safety. The overall structure is rationally designed, with convenient assembly and disassembly of each component, and simple operation, facilitating quick setup and demonstration by teachers in the classroom, thus improving teaching efficiency.

Description

Technical Field

[0001] This application relates to the field of teaching aids, and in particular to electromagnetic demonstrators for high school physics teaching. Background Technology

[0002] In high school physics electromagnetism teaching, concepts such as electromagnetic induction and eddy currents are abstract and difficult to understand, requiring intuitive demonstrations to aid student comprehension. Electromagnetic demonstrators are crucial tools for helping students intuitively understand the principles of electromagnetic interaction, but existing products have several shortcomings that fail to meet teaching needs. First, adjusting the magnetic field strength is inconvenient, failing to flexibly adapt to different teaching scenarios. Second, the pendulum type is limited, making it impossible to compare the differences in motion of pendulums made of different materials and structures in a magnetic field, thus lacking persuasiveness. Third, leveling the device is cumbersome, and its stability is poor; uneven surfaces can reduce demonstration accuracy. Fourth, the lack of effective limits on the pendulum's swing angle makes collisions during demonstrations easy, resulting in distorted results. Utility Model Content

[0003] To address the above issues, this application provides an electromagnetic demonstrator for high school physics teaching.

[0004] The electromagnetic demonstrator for high school physics teaching provided in this application adopts the following technical solution: An electromagnetic demonstrator for high school physics teaching includes: a base; two upright plates, installed vertically and parallel to each other along the length of the base at the center of the top surface of the base; three sets of pendulum assemblies, the top of which is suspended from the top of the upright plates by a support rod; three sets of magnetic field assemblies, located below each set of pendulum assemblies, for generating the magnetic field required for the demonstration; and a leveling mechanism located at the bottom of the base for adjusting the levelness of the base.

[0005] Preferably, the magnetic field assembly includes a concave frame; The bayonet is provided at the corresponding positions on the top surface of the base and the bottom ends of the concave frame, and is engaged and adapted to the bottom ends of the concave frame; There are two fixing rods, which are horizontally inserted through the top ends of the concave frame; There are two fixed shells, which are respectively installed at opposite ends of the two fixed rods; Magnets are embedded in the opposite sides of the two fixed shells; Two nuts are provided, each threaded onto the opposite end of one of the two fixing rods, for fixing the rods to the concave frame.

[0006] Preferably, the pendulum assembly includes an aluminum pendulum, the top of which is sleeved on the outer wall of the support rod via a bearing; There are two clamping plates, symmetrically arranged on the bottom wall of the support rod; A groove is formed on the top of the upright plate, and its inner bottom wall is provided with a slot that is adapted to the card plate.

[0007] It also includes a plate, whose top surface has three sets of limiting grooves at equal intervals; The limiting groove works in conjunction with three sets of aluminum pendulums to limit the swing angle of the aluminum pendulums. There are two semi-circular openings, symmetrically arranged at both ends of the adjusting plate.

[0008] Preferably, the leveling mechanism includes four fixed cylinders, which are vertically fixed to the four bottom corners of the base; The threaded rod has its top threadedly connected to the fixed cylinder and its bottom rotatably connected to the suction cup. The knob is fixedly sleeved on the outside of the threaded rod.

[0009] Preferably, the suction cup is made of silicone, and the surface of the knob has anti-slip texture.

[0010] Preferably, the magnet is a permanent magnet, and the magnets in the two fixed shells are arranged with opposite poles facing each other.

[0011] Preferably, the three sets of aluminum pendulums are solid aluminum pendulums, aluminum pendulums with iron cores, and hollow aluminum pendulums.

[0012] In summary, this application includes the following beneficial technical effects: 1. Three different types of aluminum pendulums can be used to demonstrate in multiple scenarios, helping students to intuitively understand the impact of materials and structures on electromagnetic induction phenomena and improve the relevance of teaching.

[0013] 2. The magnetic field assembly adopts a detachable design and the magnet spacing can be adjusted to easily change the magnetic field strength and direction, meet different experimental needs, and has a wide range of applications.

[0014] 3. The leveling mechanism can precisely adjust the levelness of the base, the silicone suction cup improves placement stability, and the adjusting plate can limit the swing angle of the pendulum, ensuring the accuracy and safety of the experiment.

[0015] 4. The overall structure is reasonably designed, the components are easy to assemble and disassemble, and the operation is simple, making it convenient for teachers to quickly assign and demonstrate in the classroom, thus improving teaching efficiency. Attached Figure Description

[0016] Figure 1 This is a structural front view of an embodiment of the application; Figure 2 This is a schematic diagram of the concave frame structure according to the application embodiment; Figure 3 This is a schematic diagram of the leveling mechanism in the embodiment of the application; Figure 4 This is a schematic diagram of the adjustment plate structure in the embodiment of the application.

[0017] Explanation of reference numerals in the attached drawings: 1. Base; 101. Bayonet; 2. Upright plate; 3. Concave frame; 301. Fixing shell; 302. Magnet; 303. Fixing rod; 4. Aluminum pendulum; 5. Fixing cylinder; 6. Suction cup; 7. Support rod; 701. Clamping plate; 8. Groove; 801. Slot; 9. Threaded rod; 10. Knob; 11. Adjusting plate; 12. Limiting groove; 13. Semicircular opening. Detailed Implementation

[0018] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0019] This application discloses an electromagnetic demonstrator for high school physics teaching, referring to... Figure 1 The base 1 is a rectangular plate structure made of 3mm thick aluminum alloy plate, which can stably support the weight of each component and serve as the installation base for the entire demonstrator. Two upright plates 2 are provided, which are fixed vertically and parallel to the center of the top surface of the base 1 along the length of the base 1. They are made of high-strength ABS engineering plastic injection molding, and the top is reserved with an installation space adapted to the support rod 7 for suspending the pendulum assembly.

[0020] Reference Figure 1 and Figure 2 The pendulum assembly consists of three sets, each including an aluminum pendulum 4. The top of the aluminum pendulum 4 has a mounting hole into which a deep groove ball bearing is embedded. The inner ring of the bearing is interference-fitted with the outer wall of the support rod 7, and the outer ring fits tightly with the pendulum mounting hole to ensure smooth swinging. The top of the aluminum pendulum 4 is fitted onto the outer wall of the support rod 7 via the bearing, allowing for flexible swinging. The support rod 7 is made of stainless steel round rod. The clamping plate 701 is made of acrylic sheet and is vertically bonded to the bottom wall of the support rod 7 with strong adhesive. The distance between the two clamping plates 701 matches the width of the two grooves 8. The top of the upright plate 2 has a groove 8, and the bottom wall of the groove 8 has a slot 801 that matches the clamping plate 701. After the clamping plate 701 is inserted into the slot 801, the gap between them is less than 0.1mm, preventing the support rod 7 from shifting laterally during demonstration. Simultaneously, the support rod 7 is fixed to the upright plate 2 through the clamping engagement of the clamping plate 701 and the slot 801, facilitating disassembly and replacement.

[0021] Among them, the three sets of aluminum pendulums 4 are solid aluminum pendulums, aluminum pendulums with iron cores, and hollow aluminum pendulums, respectively. The weight of each set of aluminum pendulums 4 is uniform, which can be used to compare the motion state of pendulums of different materials and structures in a magnetic field.

[0022] Reference Figure 2The magnetic field assembly consists of three sets, each corresponding to a pendulum assembly, including a concave frame 3. The top surface of the base 1 and the bottom ends of the concave frame 3 are provided with corresponding slots 101. The concave frame 3 is made of one-piece molded PP plastic, with the opening facing upwards. The outer diameter of its bottom ends perfectly matches the size of the slots 101. The concave frame 3 is detachable and installable by engaging with the slots 101 at its bottom ends. After engaging, it can be fixed by pressing with the hand; it can be separated by pulling upwards. Two fixing rods 303 are horizontally inserted at the top ends of the concave frame 3. The fixing rods 303 are brass rods. Through holes are provided at the top ends of the concave frame 3, allowing the fixing rods 303 to slide horizontally along the through holes for easy adjustment of the magnet 3. 02 Spacing: Two fixing rods 303 are respectively equipped with fixing shells 301 at their opposite ends. The fixing shells 301 are cylindrical plastic shells, and magnets 302 are embedded on their opposite sides. The magnets 302 are neodymium iron boron permanent magnets with opposite poles, which can form a uniform horizontal magnetic field between the two magnets 302. The opposite end of the fixing rod 303 is threaded with a nut and has an external thread for fixing the fixing rod 303 to the concave frame 3. When the nut is rotated to fit against the outer wall of the concave frame 3, the position of the fixing rod 303 can be locked. By adjusting the extension length of the fixing rod 303, the spacing between the two magnets 302 can be changed, thereby adjusting the magnetic field strength.

[0023] Reference Figure 1 and Figure 3 The leveling mechanism is located at the four corners of the bottom of the base 1, including the fixing cylinder 5, which is a brass sleeve with an internal thread at the bottom. It is fixed to the preset mounting seats at the four corners of the bottom of the base 1 by welding. The threaded rod 9 is a stainless steel screw, and its bottom is rotatably connected to the connecting seat at the top of the suction cup 6 through a bearing. Its top is threadedly connected to the fixing cylinder 5. The suction cup 6 has a diameter of 8cm and is made of food-grade silicone. It has an annular anti-slip texture on the bottom. After pressing the suction cup 6 to expel the internal air, the suction force can reach 50N. The knob 10 is a round PVC knob, which is fixed to the threaded rod 9 by a set screw. It has a diagonal anti-slip texture on the surface. By rotating the knob 10 (rotating clockwise to lower the threaded rod 9 and rotating counterclockwise to raise it), the height of the threaded rod 9 can be adjusted, thereby adjusting the level of the base 1. The suction cup 6 is made of silicone, which has strong adhesion and can improve the stability of the presenter. It is suitable for different surfaces such as desktops and experimental tables.

[0024] Reference Figure 4In addition, it also includes an adjustment plate 11, which is made of transparent acrylic sheet. The top surface of the adjustment plate 11 has three sets of limiting grooves 12 equidistantly distributed along the length of the adjustment plate 11. Each limiting groove 12 is a V-shaped groove, which works with the three sets of aluminum pendulums 4 to simultaneously limit the swing angle of the aluminum pendulums 4, so as to avoid affecting the display accuracy due to different swing amplitudes of the three sets of aluminum pendulums 4. The adjustment plate 11 has semi-circular openings 13 symmetrically through both ends (the edges are beveled to avoid scratching fingers when holding), which makes it easy to move the adjustment plate 11 by hand. When moving, the position of the adjustment plate 11 can be smoothly adjusted by holding the semi-circular openings 13 at both ends.

[0025] The implementation principle of the electromagnetic demonstrator for high school physics teaching in this application embodiment is as follows: During assembly, the two upright plates 2 are first vertically fixed to the center of the top surface of the base 1 to ensure that the two are parallel and the distance between them is adapted to the length of the support rod 7. Then, the support rod 7 is fixed in the groove 8 of the upright plate 2 by the cooperation of the clamping plate 701 and the clamping groove 801 to prevent the support rod 7 from shifting laterally.

[0026] When installing the magnetic field assembly, insert the bottom ends of the concave frame 3 into the slots 101 of the base 1 and press them in place. Then, install the fixing shell 301, which contains the magnet 302, at one end of the fixing rod 303. Insert the fixing rod 303 into the through hole at the top of the concave frame 3. Adjust the extension length of the fixing rod 303 according to the demonstration requirements. Rotate the nut until it fits against the outer wall of the concave frame 3 and lock the position of the fixing rod 303 to ensure that the opposite poles of the two magnets 302 form a uniform horizontal magnetic field.

[0027] After the leveling mechanism is assembled, place the demonstrator in the target position and judge the levelness of the base 1 by observing the natural downward state of the pendulum. Rotate the knob 10 clockwise to lower the threaded rod 9 and rotate it counterclockwise to raise the threaded rod 9. Adjust the four leveling mechanisms until the base 1 is level. Press the suction cup 6 to expel the internal air and use its suction force to enhance the stability of the device.

[0028] Before the demonstration, hold the semi-circular openings 13 at both ends of the adjustment plate 11 and place one corner of each of the three sets of aluminum pendulums 4 into the limiting slots 12 of the adjustment plate 11. After unifying the swing angle, remove the adjustment plate 11 and observe the differences in the swing amplitude and damping effect of the three sets of pendulums in the magnetic field. This completes a comparative demonstration of the interaction between pendulums of different materials and structures and electromagnetic fields.

[0029] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0030] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electromagnetic demonstration instrument for high school physics teaching, characterized in that, include: Base (1); There are two upright plates (2), which are installed vertically and parallel to each other along the length of the base (1) at the center of the top surface of the base (1); The pendulum assembly is provided in three sets, and its top is suspended from the top of the vertical plate (2) by a support rod (7); The magnetic field assembly consists of three sets, located below each set of the pendulum assembly, for forming the magnetic field required for the demonstration; A leveling mechanism is located at the bottom of the base (1) and is used to adjust the levelness of the base (1).

2. The electromagnetic demonstration instrument for high school physics teaching according to claim 1, characterized in that: The magnetic field assembly includes a concave frame (3); The bayonet (101) is opened at the corresponding positions on the top surface of the base (1) and the bottom ends of the concave frame (3), and is engaged and adapted to the bottom ends of the concave frame (3); There are two fixing rods (303), which are horizontally inserted through the top two ends of the concave frame (3); There are two fixed shells (301), which are respectively installed at opposite ends of the two fixed rods (303); Magnets (302) are embedded in opposite sides of the two fixed shells (301); Two nuts are provided, which are threaded onto opposite ends of the two fixing rods (303) respectively, for fixing the fixing rods (303) and the concave frame (3).

3. The electromagnetic demonstration instrument for high school physics teaching according to claim 1, characterized in that: The pendulum assembly includes an aluminum pendulum (4), the top of which is sleeved on the outer wall of the support rod (7) via a bearing; Two clamping plates (701) are provided, symmetrically arranged on the bottom wall of the support rod (7); A groove (8) is formed on the top of the upright plate (2), and its inner bottom wall is provided with a slot (801) that is adapted to the card plate (701).

4. The electromagnetic demonstration instrument for high school physics teaching according to claim 3, characterized in that: It also includes a flat plate (11), whose top surface is provided with three sets of limiting grooves (12) at equal intervals. The limiting groove (12) cooperates with the three sets of aluminum pendulums (4) to limit the swing angle of the aluminum pendulums (4); There are two semi-circular openings (13), which are symmetrically opened at both ends of the adjusting plate (11).

5. The electromagnetic demonstration instrument for high school physics teaching according to claim 1, characterized in that: The leveling mechanism includes four fixed cylinders (5), which are vertically fixed to the four bottom corners of the base (1). The threaded rod (9) has its top threadedly connected to the fixed cylinder (5) and its bottom rotatably connected to the suction cup (6); The knob (10) is fixedly sleeved on the outside of the threaded rod (9).

6. The electromagnetic demonstration instrument for high school physics teaching according to claim 5, characterized in that: The suction cup (6) is made of silicone, and the knob (10) has anti-slip texture on its surface.

7. The electromagnetic demonstration instrument for high school physics teaching according to claim 2, characterized in that: The magnet (302) is a permanent magnet, and the magnets (302) in the two fixed shells (301) are arranged with opposite poles facing each other.

8. The electromagnetic demonstration instrument for high school physics teaching according to claim 3, characterized in that: The three sets of aluminum pendulums (4) are solid aluminum pendulums, aluminum pendulums with iron cores, and hollow aluminum pendulums, respectively.

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