Middle school physics electromagnetic teaching aid

Abstract

The utility model provides a middle school physics electromagnetic teaching aid, which comprises a base, a first rotating shaft, a plurality of solenoid assemblies, a power supply assembly and a magnetic block, wherein the first rotating shaft is rotatably connected to the base; the solenoid assemblies are arranged around the axis of the first rotating shaft and have different coil turns; the power supply assembly is used for supplying power to the solenoid assemblies; according to the utility model, the first rotating shaft is rotated to drive the solenoid assembly to rotate, and the conductive part is fixedly connected with the rotatable second rotating shaft, so that the solenoid assembly with more coil turns pushes the conductive part, and the conductive part swings, so that the solenoid assembly crosses the conductive part; at the moment, the solenoid assembly with the small number of coil turns moves to the position of the solenoid assembly with the large number of coil turns, then an operator rotates the second rotating shaft to enable the conductive part to be electrically connected with the solenoid assembly with the small number of coil turns, teaching can be conducted, and therefore the effect that the solenoid assemblies are convenient to replace is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of physics teaching, and in particular to an electromagnetic teaching aid for middle school physics. Background Technology

[0002] Electromagnetism is a branch of physics that studies the interaction between electricity and magnetism, its laws, and applications. According to modern physics, magnetic phenomena are produced by moving electric charges; therefore, the scope of electricity necessarily includes elements of magnetism to varying degrees.

[0003] In junior high school physics, as an introductory material for students' physics education, it plays a crucial role in guiding students' interest in physics. Students often increase their interest in physics experiments by conducting them themselves. The content on electricity and magnetism in junior high school physics textbooks is the foundation and introduction to electromagnetism. It is necessary to help students understand the principles through teaching demonstrations and hands-on experiments. However, existing physics electromagnetism teaching aids usually use a solenoid that is energized and generates a magnetic force to attract iron nails to explain the electromagnetic principle. But when explaining that the magnetic force changes with the number of turns of the solenoid coil, it is necessary to disassemble the original solenoid and replace it with a solenoid with a different number of turns of coil, which is very inconvenient. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide an electromagnetic teaching tool for middle school physics.

[0005] The present invention provides the following technical solution: a middle school physics electromagnetic teaching tool, comprising a base, a first rotating shaft rotatably connected to the base, a plurality of solenoid assemblies with different numbers of coil turns arranged around the axis of the first rotating shaft, a power supply assembly for supplying power to the solenoid assembly, and a magnetic block movably arranged on the base;

[0006] The power supply assembly includes a rotatable second shaft, two conductive elements disposed on the second shaft, and a power supply unit. The two terminals of the power supply unit are electrically connected to the two conductive elements respectively. The two conductive elements are in contact with the two terminals of the solenoid assembly. Rotating the first shaft causes the solenoid body thereon to rotate, so that the two terminals of one of the solenoid bodies are in contact with the two conductive elements respectively.

[0007] Furthermore, the power supply assembly also includes a torsion spring for limiting the rotation of the second shaft.

[0008] Furthermore, the power supply assembly also includes a fixed post, the second rotating shaft is rotatably connected to the fixed post, one end of the torsion spring is connected to the fixed post, and the other end is connected to the second rotating shaft.

[0009] Furthermore, the power supply unit includes a power supply, a switch, and a sliding rheostat, wherein the power supply, the switch, and the sliding rheostat are connected in series via wires.

[0010] Furthermore, the power supply unit also includes a support frame fixedly connected to the base, and the power supply, the switch, and the sliding rheostat are all fixedly connected to the support frame.

[0011] Furthermore, the physical electromagnetic teaching aid also includes a guide rod disposed on the base, and the magnetic block is slidably connected to the guide rod.

[0012] Furthermore, the solenoid assembly includes a connecting frame fixedly connected to the first rotating shaft, a solenoid body disposed on the connecting frame, and two electrical connection ports disposed on the solenoid body, the two electrical connection ports being used for electrical connection with the two conductive elements.

[0013] Furthermore, the physical electromagnetic teaching aid also includes a positioning component, which includes a sliding sleeve disposed on the base, a pin slidably connected to the sliding sleeve, and recesses of the same number as the solenoid assembly that are opened around the outer wall of the first rotating shaft along its axis. The pin is inserted into the recesses to fix the first rotating shaft.

[0014] The beneficial effects of this utility model are as follows: by rotating the first rotating shaft, the rotation of the first rotating shaft drives the solenoid assembly to rotate. Since the conductive part is fixedly connected to the rotatable second rotating shaft, the solenoid assembly with more coil turns will push the conductive part, and the conductive part will swing, so that the solenoid assembly passes over the conductive part. At this time, the solenoid assembly with fewer coil turns will move to the position of the solenoid assembly with more coil turns. Then the operator rotates the second rotating shaft to make the conductive part electrically connected to the solenoid assembly with fewer coil turns, so that teaching can be carried out. This achieves the effect of facilitating the replacement of solenoid assemblies. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a three-dimensional structural diagram of the solenoid assembly of this utility model.

[0017] Figure 3 This is a three-dimensional structural diagram of the magnetic block and guide rod of this utility model.

[0018] Figure 4 This is a three-dimensional structural diagram of the power supply component of this utility model.

[0019] Figure 5This is a three-dimensional structural diagram of the positioning component of this utility model.

[0020] The labels in the attached diagram are as follows: 1-base, 2-first rotating shaft, 3-soleix assembly, 31-connecting frame, 32-soleix body, 34-power connection port, 4-magnetic block, 41-guide rod, 5-power supply assembly, 51-second rotating shaft, 52-conductive component, 53-fixed column, 54-torsion spring, 55-support frame, 56-sliding rheostat, 57-switch, 58-power supply, 59-wire, 6-positioning assembly, 61-sliding sleeve, 62-pin, 63-recessed hole. Detailed Implementation

[0021] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0022] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] A type of electromagnetic teaching aid for middle school physics, such as Figure 1 As shown, it includes a base 1, a first rotating shaft 2 rotatably connected to the base 1, a solenoid assembly 3 with multiple coil turns of different numbers arranged around the axis of the first rotating shaft 2, a power supply assembly 5 for supplying power to the solenoid assembly 3, and a magnetic block 4 movably arranged on the base 1.

[0025] In this embodiment, the number of solenoid assemblies 3 is two. In other embodiments, the number may be increased appropriately, but no specific limit is set here.

[0026] like Figure 4As shown, the power supply assembly 5 includes a rotatable second shaft 51, two conductive elements 52 disposed on the second shaft 51, and a power supply unit 58. The two terminals of the power supply unit 58 are electrically connected to the two conductive elements 52 respectively. The two conductive elements 52 are in contact with the two terminals of the solenoid assembly 3. Rotating the first shaft 2 causes the solenoid body 32 on it to rotate, so that the two terminals of one of the solenoid bodies 32 are in contact with the two conductive elements 52 respectively.

[0027] The second rotating shaft 51 is made of insulating material, the conductive component 52 is made of conductive material, the conductive component 52 is in the shape of a long strip and is fixedly connected to the second rotating shaft 51, and the power supply unit 58 is used to provide power 58.

[0028] It is understandable that when this physics electromagnetic teaching aid is needed, the operator can rotate the first rotating shaft 2, which drives the solenoid assembly 3 to rotate, making the solenoid assembly 3 with more coil turns electrically contact the conductive element 52. Then, the operator can operate the power supply unit 58, which supplies power, causing current to flow from the conductive element 52 to the solenoid assembly 3. At this time, the solenoid assembly 3 generates magnetic force, which attracts the magnetic block 4. The magnetic block 4 is attracted by the magnetic force and moves. Students will directly observe the movement of the magnetic block 4, and the teacher can explain the underlying principle, thus increasing students' learning interest. When it is necessary to replace the solenoid assembly 3 with a smaller number of coil turns, the operator only needs to continue rotating the first rotating shaft 2. The rotation of the first rotating shaft 2 drives the solenoid assembly 3 to rotate. Since the conductive element 52 is fixedly connected to the rotatable second rotating shaft 51, the solenoid assembly 3 with a larger number of coil turns... Solenoid assembly 3 pushes conductive element 52, causing conductive element 52 to swing. This allows solenoid assembly 3 to pass over conductive element 52. At this point, the solenoid assembly 3 with fewer coil turns will move to the position previously occupied by the solenoid assembly 3 with more coil turns. The operator rotates the second shaft 51, electrically connecting conductive element 52 with the solenoid assembly 3 with fewer coil turns. Then, the power supply unit 58 is operated, allowing current to flow through the solenoid assembly 3 with fewer coil turns. At this point, the magnetic force generated by the solenoid assembly 3 with fewer coil turns decreases, making it unable to attract the magnetic block 4. The teacher can then explain the underlying principle. Next, the teacher can operate the power supply unit 58 to increase the current flowing through the solenoid assembly 3 with fewer coil turns. This increases the magnetic force of the solenoid assembly 3, allowing it to attract the magnetic block 4. The teacher can then explain the principle of the effect of current on magnetic force.

[0029] The power supply component 5 also includes a torsion spring 54, which is used to limit the rotation of the second rotating shaft 51;

[0030] A fixed post 53 is fixedly connected to the base 1. The second rotating shaft 51 is rotatably connected to the fixed post 53. One end of the torsion spring 54 is connected to the fixed post 53, and the other end is connected to the second rotating shaft 51. The torsion spring 54 is sleeved on the outer wall of the second rotating shaft 51. When the operator needs to replace the solenoid assembly 3, rotating the first rotating shaft 2 will cause the previously used solenoid assembly 3 to push the conductive element 52 to swing. The swing of the conductive element 52 will drive the second rotating shaft 51 to rotate. The rotation of the second rotating shaft 51 will deform the torsion spring 54. When the previously used solenoid assembly 3 is replaced, the torsion spring 54 will be rotated. After the coil assembly 3 passes the conductive element 52, the torsion spring 54 will reset, driving the second rotating shaft 51 to reset, thereby driving the conductive element 52 to reset. At this time, the operator only needs to rotate the solenoid assembly 3 to contact the conductive element 52 to achieve electrical connection, which facilitates operation. In addition, the torsion spring 54 can prevent the second rotating shaft 51 from rotating, keeping the second rotating shaft 51 in its original state under a certain force. This prevents the conductive element 52 from swinging when using the electromagnetic teaching aid, causing the conductive element 52 to detach from the solenoid assembly 3 and affecting teaching.

[0031] like Figure 4 As shown, the power supply unit 58 includes a power supply 58, a switch 57, and a sliding rheostat 56. The power supply 58, the switch 57, and the sliding rheostat 56 are connected in series via wires 59.

[0032] In this circuit, the positive terminal of power supply 58 is electrically connected to switch 57 via wire 59, switch 57 is electrically connected to the input terminal of sliding rheostat 56 via wire 59, the output terminal of sliding rheostat 56 is electrically connected to the upper conductive element 52 via wire 59, and the negative terminal of power supply 58 is electrically connected to the lower conductive element 52 via wire 59. There is a gap in the wire 59 between the negative terminal of power supply 58 and the lower conductive element 52 so that the lower conductive element 52 can rotate. There is a gap in the wire 59 between the output terminal of sliding rheostat 56 and the upper conductive element 52 so that the upper conductive element 52 can rotate. The current of the output solenoid assembly 3 is adjusted by operating the sliding rheostat 56. The sliding rheostat 56 is existing technology and will not be described in detail here. Switch 57 is used to disconnect power supply 58.

[0033] Furthermore, the power supply unit 58 also includes a support frame 55 fixedly connected to the base 1, and the power supply 58, the switch 57 and the sliding rheostat 56 are all fixedly connected to the support frame 55; it can be understood that the power supply 58, the switch 57 and the sliding rheostat 56 are supported to facilitate operation by the operator.

[0034] Furthermore, such as Figure 3 As shown, the physical electromagnetic teaching aid also includes a guide rod 41 disposed on the base 1, and the magnetic block 4 is slidably connected to the guide rod 41.

[0035] The magnetic block 4 is preferably made of iron and has a through hole in the middle. The magnetic block 4 is sleeved on the guide rod 41 through the through hole. A blocking piece is formed on the upper part of the guide rod 41 extending outward to block the magnetic block 4 and prevent the magnetic block 4 from moving out of the upper part of the guide rod 41.

[0036] like Figure 2 As shown, the solenoid assembly 3 includes a connecting frame 31 fixedly connected to the first rotating shaft 2, a solenoid body 32 disposed on the connecting frame 31, and two power connection ports 34 disposed on the solenoid body 32. The two power connection ports 34 are used for electrical connection with the two conductive elements 52.

[0037] The solenoid body 32 preferably has an iron core in the middle, and the conductive wire is spirally wound on the solenoid body 32. Of course, the middle of the solenoid body 32 can also be made of other materials, such as plastic. Setting it as an iron core can increase the magnetic force. The two ends of the conductive wire are electrically connected to two power terminals 34 respectively. The power terminals 34 are the electrical ends of the solenoid assembly 3. The working principle of the solenoid assembly 3 is the same as that of solenoids on the market, and will not be described in detail here.

[0038] like Figure 5 As shown, the physical electromagnetic teaching aid also includes a positioning component 6. The positioning component 6 includes a sliding sleeve 61 provided on the base 1, a pin 62 slidably connected to the sliding sleeve 61, and recesses 63 that are the same number as those of the solenoid assembly 3 and are opened around the outer wall of the first rotating shaft 2 along its axis. The pin 62 is inserted into the recesses 63 to fix the first rotating shaft 2.

[0039] It is understandable that a positioning component 6 is provided to prevent the solenoid assembly 3 from separating from the conductive component 52 when the physical electromagnetic teaching aid is energized. It is also understandable that when the operator rotates the first rotating shaft 2 to drive the solenoid assembly 3 to rotate, when the concave hole 63 and the pin 62 are in a straight line, the solenoid assembly 3 corresponding to the concave hole 63 will contact the conductive component 52, and the solenoid assembly 3 will slightly squeeze the conductive component 52, so that the conductive component 52 and the power connection port 34 of the solenoid assembly 3 are tightly fitted. At this time, when the operator inserts the pin 62 into the concave hole 63, the first rotating shaft 2 will not be able to rotate, and the solenoid assembly 3 will not be able to move, thereby preventing the solenoid assembly 3 from separating from the conductive component 52.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A middle school physics electromagnetic teaching aid, characterized in that, The device includes a base, a first rotating shaft rotatably connected to the base, a plurality of solenoid assemblies with different numbers of coil turns arranged around the axis of the first rotating shaft, a power supply assembly for supplying power to the solenoid assembly, and a magnetic block movably arranged on the base. The power supply assembly includes a rotatable second shaft, two conductive elements disposed on the second shaft, and a power supply unit. The two terminals of the power supply unit are electrically connected to the two conductive elements respectively. The two conductive elements are in contact with the two terminals of the solenoid assembly. Rotating the first shaft causes the solenoid assembly thereon to rotate, so that the two terminals of one of the solenoid assemblies are in contact with the two conductive elements respectively.

2. The physical electromagnetic teaching aid according to claim 1, characterized in that, The power supply assembly also includes a torsion spring for limiting the rotation of the second shaft.

3. The physical electromagnetic teaching aid according to claim 2, characterized in that, The power supply assembly also includes a fixed post, the second rotating shaft is rotatably connected to the fixed post, one end of the torsion spring is connected to the fixed post, and the other end is connected to the second rotating shaft.

4. The physical electromagnetic teaching aid according to claim 1, characterized in that, The power supply unit includes a power supply, a switch, and a sliding rheostat, which are connected in series via wires.

5. The physical electromagnetic teaching aid according to claim 4, characterized in that, The power supply unit also includes a support frame fixedly connected to the base, and the power supply, the switch and the sliding rheostat are all fixedly connected to the support frame.

6. The physical electromagnetic teaching aid according to claim 1, characterized in that, The physical electromagnetic teaching aid also includes a guide rod installed on the base, and the magnetic block is slidably connected to the guide rod.

7. The physical electromagnetic teaching aid according to claim 1, characterized in that, The solenoid assembly includes a connecting frame fixedly connected to the first rotating shaft, a solenoid body disposed on the connecting frame, and two electrical connection ports disposed on the solenoid body, the two electrical connection ports being used for electrical connection with the two conductive elements.

8. The physical electromagnetic teaching aid according to claim 2, characterized in that, The physical electromagnetic teaching aid also includes a positioning component, which includes a sliding sleeve provided on the base, a pin slidably connected to the sliding sleeve, and a number of recesses corresponding to the solenoid assembly that are opened around the outer wall of the first rotating shaft along its axis. The pin is inserted into the recesses to fix the first rotating shaft.

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