Centrifugal near-center motion trail depicting device

Abstract

The utility model discloses a centrifugal near-center motion trail drawing device which comprises an upper-layer acrylic transparent disc, a lower-layer acrylic transparent disc, a motion module, a direct-current gear motor, a motor base and a voltage transformation and speed regulation module. The voltage transformation and speed regulation module is connected with a 220V alternating current power supply; the direct-current gear motor is fixed on the motor base through a screw and is connected in series with the voltage transformation speed regulation module; the top surface of the lower-layer acrylic transparent disc is adhered with optically variable cloth through a double-sided adhesive tape; a hole is drilled in the center of the lower-layer acrylic transparent disc and sleeves a motor shaft of the direct-current gear motor, and the upper-layer acrylic transparent disc is connected with the upper end of the motor shaft through a flange shaft after being drilled; the motion module is placed on the acrylic transparent disc on the upper layer; the motion module comprises a laser pen, a wood block, a switch and a 3.7 V small battery. The teaching aid has various functions, and demonstrates circular motion, centrifugal motion, proximal motion and tracks thereof; the mark remaining time is long, observation by students is facilitated, and the mark does not affect the color changing performance of the optically variable cloth.

Description

Technical Field

[0001] The utility model relates to the field of teaching equipment, in particular to a centrifugal and pericentric motion trajectory depicting device. Background Art

[0002] Experiment is an important part of physics teaching. A concise, intuitive and beautiful experiment can not only help teachers advance the teaching process and ensure teaching results, but also help students deeply understand the experimental principles and form a deep impression, so that students will enjoy it more and more. Centrifugal and pericentric motion are necessary components for teachers to explain the conditions for objects to perform circular motion, and are important examples for students to further understand the relationship between force and motion in circular motion. The successful demonstration of centrifugal motion experiment can well mobilize students' learning enthusiasm and spirit of exploration. In view of this, the author innovatively designed the demonstration device, which can demonstrate circular motion, centrifugal motion, pericentric motion and draw the motion trajectory of the object on the ground, which is consistent with the analytical diagram in the textbook, and can well break through the key and difficult points in teaching.

[0003] Existing demonstration methods include ink or a ping-pong ball rotating on a disc, drawing the trajectory of the ink or the ping-pong ball for students to observe. Based on this, some teachers also put water on the disc and use water droplets to draw the centrifugal trajectory. However, no matter which method is used, the drawn trajectory is relative to the turntable, while the reference system of the analysis diagram when the teacher explains is relative to the ground. Due to the different choices of reference systems, the actual phenomena observed by students are inconsistent with the analysis diagram, which deepens the difficulty of students in understanding the centrifugal motion trajectory. As a result, teachers can only analyze the relationship between the force and motion of objects in centrifugal motion through theoretical explanations, which makes it more abstract for students to understand.

[0004] Some teachers also use technical means to use video recording and software drawing to draw the trajectory of an object relative to the ground when it performs centrifugal motion, but this is time-consuming and not intuitive enough. Summary of the invention

[0005] In view of the above-mentioned technical deficiencies, the purpose of the utility model is to provide a centrifugal and pericentric motion trajectory depicting device, which uses a laser emitter and a light-variable material to depict the trajectory, and can achieve the depiction of the centrifugal and pericentric motion trajectory with the ground as the reference system.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The utility model provides a centrifugal and near-centrifugal motion trajectory depicting device, comprising an upper acrylic transparent disc, a lower acrylic transparent disc, a motion module, a DC reduction motor, a motor base and a transformer speed regulation module; the transformer speed regulation module is connected to a 220V AC power supply;

[0008] The DC reduction motor is fixed on the motor base by screws and connected in series with the transformer speed regulation module; the optically variable fabric is attached to the top surface of the lower acrylic transparent disc by double-sided adhesive; a hole is drilled in the center of the lower acrylic transparent disc and sleeved on the motor shaft of the DC reduction motor; the upper acrylic transparent disc is drilled and connected to the upper end of the motor shaft through the flange shaft;

[0009] The motion module is placed on the upper acrylic transparent disc; the motion module includes a laser pen, a wooden block, a switch, and a small battery; the laser pen, the switch, and the small battery are connected in series and fixedly assembled on the wooden block by hot melt adhesive;

[0010] When demonstrating centrifugal motion, the motion module is used directly for demonstration; when demonstrating pericentric motion, a horn nail is also required to be installed on the side of the motion module, and after installation, it is fixedly connected to one end of the light spring with hot melt adhesive, and the other end of the light spring is fixedly connected to the motor shaft with hot melt adhesive;

[0011] During the demonstration, place the laser pointer in the motion module with the tip facing downward on the upper acrylic transparent disc.

[0012] The beneficial effects of the utility model are: 1. The utility model device has various functions and can demonstrate circular motion, centrifugal motion, pericentric motion and their trajectories;

[0013] 2. The trajectory is drawn with the ground as the reference system;

[0014] 3. The trace can be left for about 2 minutes. The long trace time is convenient for students to observe, and the trace will not affect the color-changing properties of the light-changing fabric itself. The experiment is highly repeatable and environmentally friendly.

[0015] 4. The speed of the turntable can be quantitatively adjusted, which is convenient for teachers to operate;

[0016] 5. The device is simple and easy to carry, with clear movement trajectory and strong visibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a centrifugal and pericentric motion trajectory depicting device provided in Example 1 of the utility model;

[0019] Figure 2 A schematic diagram of a centrifugal and pericentric motion trajectory depicting device provided in Example 1 of the utility model when demonstrating pericentric motion;

[0020] Figure 3 A schematic diagram of a centrifugal and pericentric motion trajectory depicting device provided in Example 1 of the utility model when demonstrating centrifugal motion;

[0021] Figure 4 A schematic diagram of the structure of a motion module of a centrifugal and proximal motion trajectory depicting device provided in Example 1 of the utility model;

[0022] Figure 5 This is a top view of a motion module of a centrifugal and proximal motion trajectory depicting device provided in Example 1 of the utility model.

[0023] Explanation of the reference numerals: 1. Upper acrylic transparent disc; 2. Flange shaft; 3. Motor shaft; 4. Motion module; 5. Optically variable fabric; 6. Lower acrylic transparent disc; 7. Voltage-variable speed control module; 8. DC reduction motor; 9. Motor base; 10. Small battery; 11. Switch; 12. Wooden block; 13. Light spring; 14. Laser head. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1

[0025] like Figure 1 , Figure 4-Figure 5 As shown, a centrifugal and pericentric motion trajectory depicting device includes an upper acrylic transparent disc 1, a lower acrylic transparent disc 6, a motion module 4, a DC reduction motor 8, a motor base 9 and a transformer speed regulation module 7; the transformer speed regulation module 7 is connected to a 220V AC power supply;

[0026] The DC reduction motor 8 is fixed on the motor base 9 by screws and is connected in series with the voltage-variable speed control module 7; the optically variable fabric 5 is attached to the top surface of the lower acrylic transparent disc 6 by double-sided adhesive; the center of the lower acrylic transparent disc 6 is drilled and sleeved on the motor shaft 3 of the DC reduction motor 8, and the upper acrylic transparent disc 1 is drilled and connected to the upper end of the motor shaft 3 through the flange shaft 2;

[0027] The motion module 4 is placed on the upper acrylic transparent disc 1; the motion module 4 includes a laser pen, a wooden block 12, a switch 11, and a small battery 10; the laser pen, the switch 11, and the small battery 10 are connected in series and fixedly assembled on the wooden block 12 by hot melt adhesive;

[0028] When demonstrating centrifugal motion, place the laser pen of the motion module 4 downward, about 15 cm away from the center of the disc, turn on the laser pen switch 11, turn on the knob of the transformer speed control module 7, and adjust it to the slow state. After the laser pen displays a complete circle, increase the speed, and the wooden block 12 flies away from the disc, leaving a track of the wooden block 12 doing centrifugal motion on the disc.

[0029] When demonstrating pericentric motion, add a horn nail to the center of the side of the motion module 4 and connect it to the spring, and then fix the other end of the spring to the motor shaft 3 with hot melt adhesive; place the laser pen of the motion module 4 downward on the disc about 25 cm away from the center of the circle, turn on the laser pen switch 11, turn on the knob of the transformer speed regulation module 7, adjust it to the fast state, and after the laser pen displays a complete circle, reduce the speed, and the wooden block 12 performs pericentric motion, leaving a trajectory of the pericentric motion of the wooden block 12 on the disc.

[0030] Working principle:

[0031] like Figure 3 As shown, place the wood block 12 with the laser pen facing downward, about 15 cm away from the center of the upper acrylic disc 1, turn on the laser pen switch, turn on the transformer, turn the knob to adjust it to the slow state, and after the laser pen displays a complete circle, instantly increase the speed, and the wood block 12 flies away from the upper acrylic disc 1, leaving a track of the wood block 12 doing centrifugal motion on the upper acrylic disc 1.

[0032] like Figure 2 As shown, horn nails and light springs 13 are installed on the wooden block 12, and the light spring 13 and the motor 8 are fixed with hot melt adhesive. The wooden block 12 is placed with the laser pen facing downward and is placed about 25 cm away from the center of the disk. The laser pen switch 11 is turned on, and the knob of the transformer speed regulation module 7 is turned on and adjusted to the fast state. After the laser pen displays a complete circle, the speed is reduced, and the wooden block 12 performs pericentric motion, leaving a trajectory of the pericentric motion of the wooden block 12 on the disk.

[0033] The device can depict the trajectory of centrifugal and pericentric motion with the ground as a reference system, and uses a laser transmitter and a light-variable material to depict the trajectory.

[0034] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A centrifugal and pericentric motion trajectory depicting device, characterized in that: It includes an upper acrylic transparent disc, a lower acrylic transparent disc, a motion module, a DC reduction motor, a motor base and a transformer speed regulation module; the transformer speed regulation module is connected to a 220V AC power supply; The DC reduction motor is fixed on the motor base by screws and connected in series with the transformer speed regulation module; the optically variable fabric is attached to the top surface of the lower acrylic transparent disc by double-sided adhesive; a hole is drilled in the center of the lower acrylic transparent disc and sleeved on the motor shaft of the DC reduction motor; the upper acrylic transparent disc is drilled and connected to the upper end of the motor shaft through the flange shaft; The motion module is placed on the upper acrylic transparent disc; the motion module includes a laser pen, a wooden block, a switch, and a small battery; the laser pen, the switch, and the small battery are connected in series and fixedly assembled on the wooden block by hot melt adhesive; When demonstrating centrifugal motion, the motion module is used directly for demonstration; when demonstrating pericentric motion, a horn nail is also required to be installed on the side of the motion module, and after installation, it is fixedly connected to one end of the light spring with hot melt adhesive, and the other end of the light spring is fixedly connected to the motor shaft with hot melt adhesive; During the demonstration, place the laser pointer in the motion module with the tip facing downward on the upper acrylic transparent disc.

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