Physical balance force experiment demonstration device

Abstract

The utility model relates to the technical field of teaching aids, in particular to a physical balance force experiment demonstration device, which is characterized in that a conductive contact is arranged on a middle scale of an indicating dial, an electric brush is arranged on a conductive pointer, the electric brush is in sliding contact with the indicating dial, and one end opposite to the electric brush is fixedly arranged on a rotating center of a balance rod; the conductive contact, the conductive pointer and the power supply module are electrically connected to form a conductive loop, and the conductive loop is conducted when the conductive pointer is in contact with the conductive contact; the conductive loop is also connected with the sound production module, so that when the balance force experiment device body is in a balance state, the conductive loop is conducted through contact between the conductive pointer and the conductive contact, the sound production module sends out a sound signal, and when weights placed in the tray are close to each other and the balance rod is closer to a horizontal state, the sound production module gives out a sound signal. Whether the balance state is reached or not can be judged by judging whether the sound production module sends a sound signal or not, so that teaching errors caused by wrong experimental data are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of teaching tools, in particular to a physical balance force experiment demonstration device. Technical Background

[0002] Force balance is an important part of mechanics. In physical experiments, torque balance devices are often used to study the conditions for the balance of two forces. Force balance experiments can help students better master knowledge in life and subjects. For example, the "Two Forces Balance" experiment in the current textbooks is an important part of mechanics and the basis for further learning junior high school mechanics.

[0003] However, in the past, when explaining and demonstrating this course, teachers could only rely on temporary drawings to explain, and could not vividly reveal the scientific principles to students, and lacked a clear and intuitive demonstration device.

[0004] To solve the above problems, the Chinese utility model patent application number 201720089010.6 announced a physical experiment simulation device, including a base, a support rod is installed on the rear side of the top of the base, a balance rod is provided on the front of the top tube, ball grooves are installed on the top and left and right sides of the top of the balance rod, a moving platform is provided on the front of the linear slide rail, and side balance plates are installed on the left and right sides of the bottom of the moving platform. Through the cooperation of the side balance plates, the balance rod and the central movable part, the moving platform slides on the linear slide rail through a slider, and the side balance plate at the bottom of the moving platform is pressed on the balance rod, so that the balance rod is in a balanced state, ensuring that the balance rod is in a balanced state when demonstrating the two-force balance experiment. Balls with different density ratios are placed in the ball grooves on the left and right sides of the balance rod. When the gravity on the left and right sides of the balance rod is uneven, the central movable part at the center makes the heavier end of the balance rod drop and the lighter end rise, so as to demonstrate the two-force balance in physics.

[0005] However, the above-mentioned prior art has the following technical problems: when the density of the balls placed in the ball slot is close, the gravity on the left and right sides of the balance bar becomes close, which in turn causes the balance bar to be closer to a horizontal state. At this time, it is difficult to judge whether the two sides of the balance bar are balanced only by visual inspection, which easily leads to erroneous experimental data and teaching errors. Utility Model Content

[0006] In view of this, it is necessary to provide a physical balance force experimental demonstration device that can send out a signal when two forces are balanced.

[0007] The utility model provides a physical balance force experiment demonstration device, comprising a balance force experiment device body, a conductive pointer, an indicator disk, a power supply module and a sound module; the indicator disk, the power supply module and the sound module are all installed on the balance force experiment device body, one end of the conductive pointer is fixedly installed on the balance force experiment device body, and the other end is in sliding contact with the indicator disk, a conductive contact is arranged at the middle position of the indicator disk, the conductive contact, the conductive pointer and the power supply module are electrically connected to form a conductive loop, and the conductive loop is turned on when the conductive pointer is in contact with the conductive contact; the sound module is also connected in the conductive loop, so that when the balance force experiment device body is in a balanced state, the conductive loop is turned on by the conductive pointer contacting the conductive contact, so that the sound module emits a sound signal.

[0008] Preferably, the main body of the balancing force experimental device includes a base, a support frame, a balancing rod, a height adjustment rod, and a tray. The support frame is installed on the base, the height adjustment rod is arranged on the support frame, and the balancing rod is freely rotatably arranged on the height adjustment rod. The center of gravity of the balancing rod coincides with the center of rotation so as to maintain a balanced state when not subject to external force. Trays are hung at both ends of the balancing rod for placing weights or heavy objects. The indicator disk, power supply module, and sound module are all fixedly installed on the support frame. One end of the conductive pointer is fixedly installed on the center of gravity of the balancing rod, and the other end is in sliding contact with the indicator disk so as to rotate synchronously with the balancing rod.

[0009] Preferably, a height adjustment rod through hole is provided on the top of the support frame.

[0010] Preferably, a pin hole is provided on the height adjustment rod, so as to fix the height adjustment rod on the support frame through a pin shaft, so as to adjust the height of the balance rod from the base.

[0011] Preferably, a brush is provided on the conductive pointer.

[0012] Preferably, the indicator disk is fan-shaped, with scales evenly arranged on the indicator disk, the middle position being scale 0 for observing the deflection angle of the balance bar, and a conductive contact is arranged at scale 0 of the indicator disk.

[0013] Preferably, the physical balance force experiment demonstration device also includes a buffer component, and a buffer component is installed under each tray to prevent the tray from being overloaded and causing damage to the device.

[0014] Preferably, the buffer assembly includes a buffer base, a spring, a buffer block and a sealing ring, the buffer base is fixedly mounted on the base, the buffer block is installed in the buffer base, one end of the spring is fixedly mounted on the buffer base, and the other end is fixed on the buffer block, the sealing ring is fixedly mounted on the buffer block to seal the buffer base and weaken the elastic force of the spring on the buffer block, and the buffer block is made of rubber material.

[0015] Preferably, the physical balance force experiment demonstration device further comprises a horizontal control component, and the horizontal control components are symmetrically installed at both ends of the balance bar to serve as a reference for the balance bar to reach a balanced state, thereby ensuring the accuracy of the experiment.

[0016] Preferably, the horizontal control component is a transparent cylindrical cavity with horizontal engraved lines on the surface, symmetrically mounted at both ends of the balance rod, and a small amount of opaque liquid is filled inside the horizontal control component.

[0017] In the above-mentioned physical balance force experimental demonstration device, a conductive contact is provided on the middle scale of the indicator disk, and a brush is provided on the conductive pointer. The brush is in sliding contact with the indicator disk, and the end opposite to the brush is fixedly installed on the rotation center of the balance bar. The indicator disk, the power supply module and the sound module are electrically connected, and the conductive pointer is electrically connected to the power supply module. When a weight or a heavy object is placed on the tray so that the balance bar reaches a balanced state, the brush contacts the conductive contact, connects the circuit, and the sound module emits a sound signal. In this way, when the weight of the heavy objects placed in the tray is close, causing the balance bar to be closer to a horizontal state, it can be judged whether the balance state is reached by whether the sound module emits a sound signal, thereby avoiding obtaining wrong experimental data and causing teaching errors. At the same time, a buffer component and a horizontal control component are also provided in the above-mentioned device. The buffer component is used to prevent the tray from being overloaded and causing damage to the device. The horizontal control component can be used as a reference for the balance bar to reach a balanced state, ensuring the accuracy of the experimental data. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the physical balance force experiment demonstration device.

[0019] Figure 2 This is a schematic diagram of the structure of the main body of the balance force experimental device.

[0020] Figure 3 It is a schematic diagram of the connection between the balance rod and the height adjustment rod.

[0021] Figure 4 A schematic diagram of the structure of the support frame.

[0022] Figure 5 It is a structural diagram of the indicator panel.

[0023] Figure 6 Schematic diagram of the structure of the conductive pointer.

[0024] Figure 7 A schematic diagram of the structure of the buffer component.

[0025] In the figure: a physical balance force experiment demonstration device 1, a balance force experiment device body 10, a base 11, a support frame 12, a height adjustment rod through hole 121, a balance rod 13, a height adjustment rod 14, a pin hole 141, a pin shaft 142, a tray 15, a conductive pointer 16, a brush 161, an indicator plate 17, a conductive contact 171, a power supply module 18, a sound module 19, a buffer assembly 20, a buffer base 21, a spring 22, a buffer block 23, a sealing ring 24, and a horizontal control assembly 30. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Please see Figures 1 to 7 The specific implementation method provided by the present application is: a physical balance force experiment demonstration device 1, comprising a balance force experiment device body 10, a conductive pointer 16, an indicator disk 17, a power supply module 18 and a sound module 19; the indicator disk 17, the power supply module 18 and the sound module 19 are all installed on the balance force experiment device body 10, one end of the conductive pointer 16 is fixedly installed on the balance force experiment device body 10, and the other end is in sliding contact with the indicator disk 17, and a conductive contact 171 is arranged at the middle position of the indicator disk 17, and the conductive contact 171, the conductive pointer 16 and the power supply module 18 are electrically connected to form a conductive circuit, and the conductive circuit is turned on when the conductive pointer 16 contacts the conductive contact 171; the sound module 19 is also connected to the conductive circuit, so that when the balance force experiment device body 10 is in a balanced state, the conductive circuit is turned on by the conductive pointer 16 contacting the conductive contact 171, so that the sound module 19 emits a sound signal.

[0028] Furthermore, the main body 10 of the balancing force experimental device includes a base 11, a support frame 12, a balancing rod 13, a height adjustment rod 14 and a tray 15. The support frame 12 is installed on the base 11, the height adjustment rod 14 is arranged on the support frame 12, the balancing rod 13 is freely rotatably arranged on the height adjustment rod 14, the center of gravity of the balancing rod 13 coincides with the center of rotation so as to maintain a balanced state when not subjected to external force, trays 15 are fixedly installed at both ends of the balancing rod 13 for placing weights or heavy objects, the indicator disk 17, the power supply module 18, and the sound module 19 are all fixedly installed on the support frame 12, one end of the conductive pointer 16 is fixedly installed on the center of gravity of the balancing rod 13, and the other end is in sliding contact with the indicator disk 17 so as to rotate synchronously with the balancing rod 13.

[0029] Furthermore, a height adjustment rod through hole 121 is provided on the top of the support frame 12 for passing the height adjustment rod 14 through and installing it on the support frame 112 .

[0030] Furthermore, a pin hole 141 is provided on the height adjustment rod 14 , so as to fix the height adjustment rod 14 on the support frame 12 through a pin shaft 142 , so as to adjust the height of the balance rod 13 from the base 11 .

[0031] In this embodiment, the height adjustment rod 14 can be fixed to the support frame 12 by using the pin shaft 142 to pass through the pin hole 141 on the height adjustment rod 14 to adjust the distance from the balance rod 13 to the base 11, which is convenient for use and disassembly and maintenance of the device.

[0032] In another embodiment, a threaded hole is provided at the top of the support frame 12, and the height adjustment rod 14 is a lead screw. The height adjustment rod 14 passes through the threaded hole provided at the top of the support frame 12 and is rotatably connected to the balance rod 13. The height adjustment rod 14 is rotated to adjust the distance from the balance rod 13 to the base 11, which facilitates the use and disassembly and maintenance of the device. The threaded connection can be used to accurately adjust the distance from the balance rod 13 to the base 11.

[0033] Furthermore, a brush 161 is provided on the conductive pointer 16 .

[0034] Furthermore, the indicator disk 17 is fan-shaped, and scales are evenly arranged on the indicator disk 17 , with the middle position being scale 0 for observing the deflection angle of the balance bar 13 , and a conductive contact 171 is arranged at scale 0 of the indicator disk 17 .

[0035] In this embodiment, the brush 161 is electrically connected to the power supply module 18 through the conductive pointer 16, and the conductive contact 171 is electrically connected to the power supply module 18 through the indicator disk 17. The brush 161 slides on the indicator disk 17, and can contact the conductive contact 171 to connect the circuit, while also effectively reducing the impact on the balance bar 13. A scale is set on the indicator disk 17 to observe the deflection angle of the balance bar 13.

[0036] In another embodiment, a graphite coating may be provided on the middle scale of the indicator disk 17 to replace the conductive contact 171, and the brush 161 slides to the middle scale and contacts the graphite coating to connect the circuit so that the sound module 19 emits a sound signal.

[0037] In the above embodiment, the physical balance force experiment demonstration device 1 also includes a buffer component 20 and a horizontal control component 30. A buffer component 20 is installed under each tray 15 to improve the stability of the tray 15 when replacing weights or objects, and prevent the tray 15 from being overloaded and causing damage to the device. Horizontal control components 30 are symmetrically installed at both ends of the balance bar 13 to serve as reference objects for the balance bar 13 to reach a balanced state, thereby ensuring the accuracy of the experiment.

[0038] The buffer assembly 20 includes a buffer base 21, a spring 22, a buffer block 23 and a sealing ring 24. The buffer base 21 is fixedly mounted on the base 11, the buffer block 23 is mounted in the buffer base 21, one end of the spring 22 is fixedly mounted on the buffer base 21, and the other end is fixed on the buffer block 23. The sealing ring 24 is fixedly mounted on the buffer block 23 to seal the cavity between the buffer base 21 and the buffer block 23, and the air in the cavity is used to play a damping role, thereby reducing the pressure of the buffer block 23 on the spring 22 and the pressure of the spring 22 on the buffer. The elastic force of the punch block 23 prevents the spring 22 from vibrating multiple times, which would cause the tray 15 to be in an unbalanced and unstable state. The buffer block 23 is made of rubber to improve the buffering effect. The horizontal control component 30 is a transparent cylindrical cavity with horizontal scale lines on the surface. It is symmetrically installed at both ends of the balance bar 13. A small amount of opaque liquid is contained in the horizontal control component 30. The opaque liquid is used to facilitate observation of whether the liquid level in the cavity coincides with the horizontal scale lines, so as to serve as a reference for the experimental results of the balance bar 13 reaching a balanced state, thereby improving the accuracy of the experiment.

[0039] When the utility model is implemented, it is first necessary to perform leveling to ensure that when no weights or objects are placed on the trays 15 at both ends of the balance bar 13, the balance bar 13 is in a horizontal state. At this time, the conductive pointer 16 points to the middle scale of the indicator disk 17, and the brush 161 on the conductive pointer 16 contacts the conductive contact 171 on the middle scale of the indicator disk 17 to connect the circuit. The power supply module 18 supplies power to the sound device to emit a sound signal, indicating that the balance bar 13 has reached a balanced state. By observing whether the liquid level in the horizontal control assembly 30 set at both ends of the balance bar 13 coincides with the horizontal scale line, it is verified whether the leveling is successful. During the demonstration, objects and weights are placed on the trays 15 on both sides of the balance bar 13. During the process of placing weights or heavy objects, the angle of the conductive pointer 16 relative to the indicator disk 17 is observed. When the weights of the objects and weights on the two trays 15 are the same, the brush 161 on the conductive pointer 16 installed on the balance bar 13 slides synchronously left and right on the indicator disk 17 during the process of the balance bar 13 swinging slowly left and right to reach balance. Whenever the brush 161 on the conductive pointer 16 contacts the conductive contact 171 on the middle scale of the indicator disk 17, the circuit is connected, and the power supply module 18 supplies power to the sound device to emit a sound signal. As the balance bar gradually reaches the balance point, the brush 161 on the conductive pointer 16 contacts the conductive contact 171 on the middle scale of the indicator disk 17. When it reaches the equilibrium state, the sound frequency gradually becomes faster until the sound is emitted continuously. At this time, the conductive pointer 16 coincides with the middle scale on the indicator disk 17, indicating that the balance bar 13 has reached the equilibrium state. The experimental results are verified by observing whether the liquid level in the horizontal control assembly 30 set at both ends of the balance bar 13 coincides with the horizontal scale line. In this way, the balance force experiment is demonstrated clearly and intuitively, and the problem of obtaining wrong experimental data and causing teaching errors due to the close weight of the heavy objects placed in the tray 15 is avoided. At the same time, the above-mentioned device is also provided with a buffer assembly 20 to improve the stability of the tray 15 when replacing weights or objects, and prevent the tray 15 from being damaged due to excessive load.

[0040] The modules or units in the device of the embodiment of the utility model can be combined, divided and deleted according to actual needs. The above disclosure is only the preferred embodiment of the utility model, and of course it cannot be used to limit the scope of the rights of the utility model. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of the utility model still fall within the scope of the utility model.

Claims

1. A physical balance force experimental demonstration device, characterized in that: The invention comprises a balancing force experiment device body, a conductive pointer, an indicator plate, a power supply module and a sound module; the indicator plate, the power supply module and the sound module are all installed on the balancing force experiment device body, one end of the conductive pointer is fixedly installed on the balancing force experiment device body, and the other end is in sliding contact with the indicator plate, a conductive contact is arranged at the middle position of the indicator plate, the conductive contact, the conductive pointer and the power supply module are electrically connected to form a conductive circuit, and the conductive circuit is turned on when the conductive pointer is in contact with the conductive contact; the sound module is also connected in the conductive circuit, so that when the balancing force experiment device body is in a balanced state, the conductive circuit is turned on by the conductive pointer in contact with the conductive contact, so that the sound module emits a sound signal.

2. According to the physical balance force experiment demonstration device of claim 1, its characteristics are: the main body of the balance force experiment device includes a base, a support frame, a balance rod, a height adjustment rod and a tray, the support frame is installed on the base, the height adjustment rod is arranged on the support frame, the balance rod is freely rotatably arranged on the height adjustment rod, the center of gravity of the balance rod coincides with the center of rotation so as to maintain a balanced state when not subject to external force, trays are hung at both ends of the balance rod for placing weights or heavy objects, the indicator plate, power supply module, and sound module are all fixedly installed on the support frame, one end of the conductive pointer is fixedly installed on the center of gravity of the balance rod, and the other end is in sliding contact with the indicator plate for synchronous rotation with the balance rod.

3. According to the physical balance force experiment demonstration device of claim 2, its characteristic is that: a height adjustment rod through hole is set on the top of the support frame.

4. According to the physical balance force experiment demonstration device of claim 3, its characteristic is that: a pin hole is provided on the height adjustment rod, which is used to fix the height adjustment rod on the support frame through a pin shaft to adjust the height of the balance rod from the base.

5. The physical balance force experiment demonstration device according to claim 1 is characterized in that: a brush is provided on the conductive pointer.

6. According to the physical balance force experiment demonstration device of claim 1, its characteristic is that: the indicator disk is fan-shaped, and scales are evenly arranged on the indicator disk. The middle position is scale 0, which is used to observe the deflection angle of the balance rod, and a conductive contact is arranged at the scale 0 position of the indicator disk.

7. According to the physical balance force experiment demonstration device of claim 1, its characteristic is that: the physical balance force experiment demonstration device also includes a buffer component, and a buffer component is installed under each tray to prevent the tray from being overloaded and causing damage to the device.

8. According to the physical balance force experiment demonstration device of claim 7, its characteristics are: the buffer assembly includes a buffer base, a spring, a buffer block and a sealing ring, the buffer base is fixedly mounted on the base, the buffer block is installed in the buffer base, one end of the spring is fixedly mounted on the buffer base, and the other end is fixed on the buffer block, the sealing ring is fixedly mounted on the buffer block to seal the buffer base and weaken the elastic force of the spring on the buffer block, and the buffer block is made of rubber.

9. The physical balance force experiment demonstration device according to claim 2 is characterized in that: the physical balance force experiment demonstration device also includes a horizontal control component, and the horizontal control components are symmetrically installed at both ends of the balance bar to serve as a reference for the balance bar to reach a balanced state, thereby ensuring the accuracy of the experiment.

10. The physical balance force experiment demonstration device according to claim 9 is characterized in that: the horizontal control component is a transparent cylindrical cavity with horizontal scale lines on the surface, symmetrically installed at both ends of the balance rod, and a small amount of opaque liquid is filled inside the horizontal control component.

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