Force balance experiment device

Abstract

The utility model provides a force balance experiment device which comprises a vertical rod supporting piece, a lever cantilever, a first sliding block and a second sliding block. The lever cantilever is provided with a leveling assembly, a displacement sensor and a tilt angle sensor. A plurality of single contacts and a common contact are arranged on the lever cantilever, the plurality of single contacts are respectively connected with the displacement sensor, and the common contact is connected with the displacement sensor; the vertical rod supporting piece comprises a vertical rod, the lever cantilever is hinged to the vertical rod of the vertical rod supporting piece, and the first sliding block and the second sliding block are installed on the lever cantilever on the two sides of the vertical rod respectively. The displacement sensor is used for acquiring current position information of the first sliding block and the second sliding block; the tilt angle sensor is used for measuring the tilt angle of the lever cantilever. By using the device, a user can accurately measure the positions of the sliding blocks at the two ends of the lever cantilever and the inclination angle of the lever cantilever in real time, manual measurement errors are avoided, and the convenience of data measurement is improved.

Description

Technical Field

[0001] The invention relates to the field of measurement technology, in particular to a force balance experimental device. Background Art

[0002] The lever principle is one of the basic principles in physics. A traditional lever demonstration device usually consists of a fixed fulcrum and a lever cantilever, and the fixed fulcrum is rotatably hinged at the middle position of the lever cantilever.

[0003] However, the inventors realized that the length of the lever cantilever, the power arm, and the resistance arm of the traditional lever demonstration device all need to be measured or read manually, and there are objective measurement errors. Secondly, in determining whether the lever cantilever is horizontal, it is necessary to observe through a level bubble, and when reading the angle between the lever cantilever and the horizontal line, it is also necessary to measure and read with a protractor. Finally, the traditional lever demonstration device cannot intuitively display data such as the size of the force and the length of the lever arm. The results need to be manually entered into a table and then calculated, and the function of automatic data entry cannot be realized. Utility Model Content

[0004] In view of the above-mentioned shortcomings or disadvantages, the utility model provides a force balance experiment device. By using the balance experiment device, users can achieve real-time measurement and display of the length, force magnitude and tilt angle of the power arm and the resistance arm at both ends of the lever cantilever, thereby avoiding measurement errors caused by manual operation. In addition, the balance experiment device is also provided with a communication module, which can realize wired / wireless transmission and automatic input of the above-mentioned experimental data.

[0005] The utility model provides a force balance experimental device, which comprises: a vertical pole support, a lever cantilever, a first slider, a second slider, and the lever cantilever is provided with a leveling component, a displacement sensor and an inclination sensor;

[0006] A plurality of single contacts and a common contact are arranged on the lever cantilever, the plurality of single contacts are respectively connected to the displacement sensor, and the common contact is connected to the displacement sensor;

[0007] The pole support member includes a vertical pole, the lever cantilever is hinged to the vertical pole of the pole support member, and the first slider and the second slider are respectively installed on the lever cantilever on both sides of the vertical pole;

[0008] The displacement sensor is used to obtain current position information of the first slider and the second slider through a single contact point and a common contact point on the cantilever of the first slider and the second slider contact lever;

[0009] The inclination sensor is used to measure the inclination angle of the lever cantilever relative to the horizontal direction.

[0010] In some embodiments, metal springs are disposed in the first slider and the second slider, and the metal springs can contact the single contact point and the common contact point on the lever cantilever.

[0011] In some embodiments, the above-mentioned balance experiment device further includes a wireless communication circuit, and a Bluetooth module is also provided in the PCB in the middle of the lever cantilever, and the Bluetooth module is connected to the wireless communication circuit;

[0012] The Bluetooth module is used to send the real-time tilt angle of the lever cantilever and the current position information of the first slider and the second slider to the user terminal through the wireless communication circuit.

[0013] In some embodiments, the above-mentioned balance experiment device further includes a wired communication circuit, and the wired communication circuit is provided with a USB interface;

[0014] The wired communication circuit is used to transmit the real-time tilt angle of the lever cantilever and the current position information of the first slider and the second slider to the user terminal through the USB interface.

[0015] In some embodiments, the above-mentioned balance experiment device further includes a force sensor, a slide rail, a variety of counterweights, a pulley member, and a slide rail fixing assembly;

[0016] The slide rail is horizontally installed at a position below the cantilever of the lever, and one end of the slide rail is installed on the vertical pole of the pole support member;

[0017] The pulley is slidably mounted on the slide rail, and a force sensor is provided on the pulley;

[0018] The force sensor is connected to the second slider;

[0019] When a counterweight is suspended under the first slider, the force sensor is used to measure the pulling force of the second slider on itself.

[0020] In some embodiments, the above-mentioned balance experiment device further includes a pull rod;

[0021] A first end of the force sensor is connected to the pulley member, and a second end of the force sensor is connected to a first end of the pull rod member;

[0022] The second end of the pull rod is connected and installed on the second sliding block, and the pull rod is kept in a vertical state;

[0023] When a counterweight is suspended under the first sliding block, the force sensor is used to measure the tensile stress on the pull rod.

[0024] In some embodiments, the above-mentioned balancing experiment device further includes a main control circuit, a mobile power management circuit and a step-down circuit;

[0025] The mobile power management circuit is used to provide stable charging and discharging for the step-down circuit;

[0026] The step-down circuit is used to supply power to the displacement sensor, the inclination sensor, the main control circuit, the wired communication circuit and the wireless communication circuit;

[0027] The main control circuit is used to regulate the above-mentioned circuits and components according to instructions sent by the user.

[0028] In some embodiments, the lengths of both sides of the lever cantilever mentioned above range from 15 to 50 cm, with a graduation value of 0.1 to 1 cm, wherein each common contact is disposed on the same metal strip.

[0029] In some embodiments, the refresh frequency of the displacement sensor is 10-200 Hz.

[0030] In some embodiments, the tilt sensor is a three-axis digital accelerometer.

[0031] The force balance experimental device is provided with a displacement sensor, which can obtain the current position information of the first slider and the second slider through the single contact point and the common contact point on the lever cantilever when the first slider and the second slider contact each other, thereby realizing the real-time measurement of the length of the power arm and the resistance arm at both ends of the lever cantilever. Then, the balance experimental device is also provided with a tilt sensor, which realizes the real-time measurement of the tilt angle of the lever cantilever relative to the horizontal direction perpendicular to the vertical pole. In addition, the balance experimental device is also provided with a wireless communication circuit, and a Bluetooth module is also provided in the PCB in the middle of the lever cantilever, which can realize the wired / wireless transmission of the above-mentioned experimental data and the automatic entry into a variety of terminal devices, such as computers and smart phone terminals. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of a balancing experiment device when using an adapted counterweight in one or more embodiments of the utility model;

[0033] Figure 2 It is a schematic diagram of the overall assembly of a balance experiment device when an adaptive force sensor is used in one or more embodiments of the utility model;

[0034] Figure 3 A schematic diagram of the positions of the upper contact and the common contact of a lever cantilever in one or more embodiments of the utility model;

[0035] Figure 4 It is a schematic diagram of the overall structure of a lever cantilever component in one or more embodiments of the utility model;

[0036] Figure 5-6 A schematic diagram of the structure of a slider in one or more embodiments of the utility model;

[0037] Figure 7 A schematic diagram of a circuit structure on a PCB board at the center of a lever cantilever in one or more embodiments of the utility model;

[0038] Figure 8-9 A schematic diagram of the main control circuit structure of a balance experiment device in one or more embodiments of the utility model;

[0039] Fig.10 A schematic diagram of the structure of a wired communication circuit of a balancing experiment device in one or more embodiments of the utility model;

[0040] Fig.11 A schematic diagram of the structure of a wireless communication circuit of a balancing experiment device in one or more embodiments of the utility model;

[0041] Fig.12 A schematic diagram of a structure of a voltage-reducing circuit of a balancing experimental device in one or more embodiments of the utility model;

[0042] Fig.13 A schematic diagram of the structure of a mobile power management circuit of a balancing experiment device in one or more embodiments of the utility model;

[0043] Fig.14 A schematic diagram of the structure of a displacement measurement circuit of a balance experiment device in one or more embodiments of the utility model;

[0044] Fig.15 The present invention is a schematic diagram of a tilt angle measuring circuit of a balancing experiment device in one or more embodiments of the present invention. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0046] It should be noted that when a part or component is considered to be "connected", "located", or "assembled" on another part or component, it may be directly disposed on the other part or component or there may be a central part or component at the same time. The terms "left", "right", "upper", "lower" and similar expressions used herein are for illustrative purposes only.

[0047] The utility model provides a force balance experimental device, such as Figure 1 , 4As shown, the device includes: pole supports 410, 420, a lever cantilever 100, a first slider 310, a second slider 320, and the lever cantilever 100 is provided with leveling components 210, 220, a displacement sensor and an inclination sensor;

[0048] The lever cantilever 100 is provided with a plurality of single contacts 120 and a common contact, the plurality of single contacts 120 are respectively connected to the displacement sensor, and the common contact is connected to the displacement sensor;

[0049] The pole support members 410 and 420 include a vertical pole 410 , a lever cantilever 100 is hinged to the vertical pole 410 of the pole support members 410 and 420 , and a first slider 310 and a second slider 320 are respectively mounted on the lever cantilever 100 on both sides of the vertical pole 410 ;

[0050] The displacement sensor is used to obtain the current position information of the first slider 310 and the second slider 320 by contacting the single contact point 120 and the common contact point on the lever cantilever 100 with the first slider 310 and the second slider 320;

[0051] The inclination sensor is used to measure the inclination angle of the lever cantilever 100 relative to the horizontal direction.

[0052] Specifically, the first slider 310 and the second slider 320 are two sliders that are detachably plugged into the lever cantilever 100, and the internal and external structures of the two sliders are the same, which is not limited in this application. The current position information of the first slider 310 and the second slider 320 refers to the horizontal distance between the slider and the vertical pole 410, and the horizontal distance is within the range of 0-50 cm. The leveling components 210 and 220 are used for changing the counterweights at both ends of the lever cantilever 100 by manually twisting the leveling components 210 and 220 before the experiment begins, that is, before the weights 710 and 720 are hung on the first slider 310 and the second slider 320 or a pulling force is applied, so that the user can change the counterweights at both ends of the lever cantilever 100 by manually twisting the leveling components 210 and 220, thereby maintaining the horizontal balance of the lever cantilever 100 in the initial state. After the experiment begins, the above-mentioned balance experiment device can accurately measure the slider positions at both ends of the lever cantilever 100 and the tilt angle of the lever cantilever 100 in real time through the displacement sensor and the inclination sensor, thereby avoiding manual measurement errors and improving the convenience of data measurement.

[0053] In some embodiments, Figure 2 As shown, the above-mentioned balance experiment device also includes a force sensor, a slide rail 640, a variety of counterweights 700, a pulley 620 and a slide rail fixing assembly 610;

[0054] The slide rail 640 is horizontally mounted at a position below the lever cantilever 100 , and one end of the slide rail 640 is mounted on the vertical pole 410 of the pole support members 410 , 420 ;

[0055] The pulley member 620 is slidably mounted on the slide rail 640 , and a force sensor is provided on the pulley member 620 ; the force sensor is connected to the second slider 320 ;

[0056] When a counterweight 700 is suspended under the first slider 310 , the force sensor is used to measure the pulling force of the second slider 320 on itself.

[0057] Specifically, the force sensor of the pulley member 620 can be physically connected to the second slider 320 through a connecting member such as a rope, a connecting rod and a chain, which is not limited in this application. And when detecting the pulling force of the second slider 320 on the force sensor, it is generally necessary to maintain the above-mentioned connecting member in a vertical state, and the slide rail 640 and the lever cantilever 100 in a horizontal state, so as to obtain accurate tension measurement data. In addition, when the user adopts a standard measurement method, the lever cantilever 100 and the slide rail 640 should always remain in a parallel state. Since a counterweight 700 is suspended under the first slider 310 of the lever cantilever 100, the other second slider 320 end of the lever cantilever 100 has a tendency to tilt upward. It is known that the length of the above-mentioned connecting member itself remains unchanged, and there is tensile stress in the connecting member. In addition, since the vertical line is the shortest between the two parallel line segments, if the length of the connecting member itself remains unchanged, the connecting member should always be in a vertical state. It can be inferred from this that when the user adopts a standard measurement method, the connecting member will not tilt, so that the second slider 320 can move synchronously with the pulley member 620 and the force sensor fixed thereon.

[0058] In some embodiments, the above-mentioned balance experiment device further includes a pull rod 630;

[0059] A first end of the force sensor is connected to the pulley member 620, and a second end of the force sensor is connected to a first end of the pull rod member 630;

[0060] The second end of the pull rod 630 is connected and installed on the second slider 320, and the pull rod 630 remains in a vertical state;

[0061] When a counterweight 700 is suspended under the first sliding block 310 , the force sensor is used to measure the tensile stress on the pull rod 630 .

[0062] Specifically, a slide rail 640 is fixed to the lower side of the lever cantilever 100, and the slide rail 640 is kept parallel to the lever cantilever 100. The pulley member 620 fixed on the slide rail 640 can move left and right on the slide rail 640. The pulley member 620 and the force sensor are fixed together by bolts, and the pulley member 620 is kept in a vertical state. When the second slider 320 is moved, the force sensor and the pulley member 620 move synchronously. After the experiment starts, a counterweight 700 is suspended under the first slider 310. The above-mentioned balance experiment device can accurately measure the tensile stress on the pull rod member 630 in real time through the force sensor, so as to conveniently and intuitively reflect the theoretical counterweight required to be suspended under the second slider 320, thereby improving the efficiency of subsequent experimental data processing and recording.

[0063] In some embodiments, Figure 5-6 As shown, a metal spring 311 is disposed inside the first slider 310 and the second slider 320 , and the metal spring 311 can contact the single contact 120 and the common contact on the lever cantilever 100 .

[0064] In some embodiments, the lengths of both sides of the lever cantilever mentioned above range from 15 to 50 cm, with a graduation value of 0.1 to 1 cm, wherein each common contact is disposed on the same metal strip.

[0065] Exemplarily, it is assumed that the length of both sides of the lever cantilever 100 is 45 cm, the graduation value is 1 cm, and 92 single contacts 120 and 92 corresponding common contacts are provided. Specifically, each pair of adjacent single contacts 120 or adjacent common contacts can be set to be 1 cm apart. When the user slides the first slider 310 and / or the second slider 320, each slider makes the single contact 120 contact the common contact through the metal spring 311 provided inside the slider, and then the balance experiment device uses the above-mentioned displacement sensor to feedback the horizontal distance between the slider and the vertical pole 410 in real time, thereby avoiding the measurement error caused by manual measurement. Among them, the horizontal distance is in the range of 1-45 cm.

[0066] In some embodiments, the above-mentioned balance experiment device further includes a wireless communication circuit, and a Bluetooth module is also provided in the PCB 500 in the middle of the lever cantilever 100, and the Bluetooth module is connected to the wireless communication circuit;

[0067] The Bluetooth module is used to send the real-time tilt angle of the lever cantilever 100 and the current position information of the first slider 310 and the second slider 320 to the user terminal through the wireless communication circuit.

[0068] Specifically, the circuit structure on the PCB (Printed circuit board) 500 at the center of the lever cantilever 100 is as follows: Figure 7As shown, wireless data transmission is achieved through the Bluetooth module. When using the balance experiment device, the user can connect the device to a mobile device, such as a mobile phone or tablet, via Bluetooth to interact with the data. In the application (i.e., APP, application) provided on the mobile device, the user can monitor and record the balance parameters of the lever in real time for further analysis and research.

[0069] In some embodiments, the above-mentioned balance experimental device also includes: Fig.10 The wired communication circuit shown in the figure is provided with a USB (Universal Serial Bus) interface, for example Fig.10 USB_DP and USB_DM on the Controller;

[0070] The wired communication circuit is used to transmit the real-time tilt angle of the lever cantilever 100 and the current position information of the first slider 310 and the second slider 320 to the user terminal through the USB interface.

[0071] In some embodiments, the above-mentioned balance experimental device also includes: Figure 8-9 The main control circuit shown in Fig.12 The buck circuit shown in Fig.13 The mobile power management circuit shown;

[0072] The mobile power management circuit is used to provide stable charging and discharging for the step-down circuit;

[0073] The step-down circuit is used to supply power to the displacement sensor, the inclination sensor, the main control circuit, the wired communication circuit and the wireless communication circuit; the main control circuit is used to control the above-mentioned circuits and components according to the instructions sent by the user.

[0074] In some embodiments, the refresh frequency of the displacement sensor is 10-200 Hz. The displacement sensor is installed in Fig.14 In the displacement measurement circuit shown, the above displacement sensor can realize fixed-point measurement mode, set the refresh frequency of 10-200 Hz, to obtain the slider position data and convert it into a digital signal. Specifically, the displacement sensor cyclically scans the level difference point when the single contact 120 is short-circuited with the common contact through the displacement measurement circuit, and then determines the slider position information.

[0075] For example, when the slider is located at 40 cm from the right end of the lever cantilever 100, the displacement sensor detects a high level point at 40 cm from the right end of the lever cantilever 100, and the remaining positions are low level points, and the specific position information of the slider can be determined. Through the above design, the efficiency of slider position information sampling is improved.

[0076] In some embodiments, the above-mentioned inclination sensor is a three-axis digital accelerometer. Specifically, the above-mentioned inclination sensor is installed in Fig.15 In the tilt angle measurement circuit shown, a three-axis digital accelerometer can generally be used as the tilt angle sensor. Through such a design, the tilt angle data of the lever cantilever 100 relative to the horizontal direction can be obtained in real time and converted into a digital signal, thereby improving the accuracy of data sampling.

[0077] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A force balance experimental device, characterized in that: include: A vertical pole support, a lever cantilever, a first slider, and a second slider, wherein the lever cantilever is provided with a leveling component, a displacement sensor, and an inclination sensor; The lever cantilever is provided with a plurality of single contacts and a common contact, the plurality of single contacts are respectively connected to the displacement sensor, and the common contact is connected to the displacement sensor; The pole support member includes a vertical pole, the lever cantilever is hinged to the vertical pole of the pole support member, and the first slider and the second slider are respectively mounted on the lever cantilever on both sides of the vertical pole; The displacement sensor is used to obtain current position information of the first slider and the second slider by contacting the single contact point and the common contact point on the lever cantilever with the first slider and the second slider; The inclination sensor is used to measure the inclination angle of the lever cantilever relative to the horizontal direction.

2. The force balance experimental device according to claim 1, characterized in that: Metal springs are arranged in the first sliding block and the second sliding block, and the metal springs can contact the single contact point and the common contact point on the lever cantilever.

3. The force balance experimental device according to claim 1, characterized in that: It also includes a wireless communication circuit, and a Bluetooth module is also arranged in the printed circuit board PCB in the middle of the lever cantilever, and the Bluetooth module is connected to the wireless communication circuit; The Bluetooth module is used to send the real-time tilt angle of the lever cantilever and the current position information of the first slider and the second slider to the user terminal through the wireless communication circuit.

4. The force balance experimental device according to claim 1, characterized in that: Also includes a wired communication circuit, wherein the wired communication circuit is provided with a USB interface; The wired communication circuit is used to transmit the real-time tilt angle of the lever cantilever and the current position information of the first slider and the second slider to the user terminal through the USB interface.

5. The force balance experimental device according to claim 1, characterized in that: It also includes a force sensor, a slide rail, a variety of counterweights, a pulley, and a slide rail fixing assembly; The slide rail is horizontally mounted below the cantilever arm of the lever, and one end of the slide rail is mounted on the vertical pole of the pole support; The pulley member is slidably mounted on the slide rail, and the pulley member is provided with a force sensor; The force sensor is connected to the second slider; When the counterweight is suspended under the first sliding block, the force sensor is used to measure the pulling force of the second sliding block on itself.

6. The force balance experimental device according to claim 5, characterized in that: Also includes a tie rod member; The first end of the force sensor is connected to the pulley member, and the second end of the force sensor is connected to the first end of the pull rod member; The second end of the pull rod is connected and mounted on the second sliding block, and the pull rod is kept in a vertical state; When the counterweight is suspended under the first sliding block, the force sensor is used to measure the tensile stress on the pull rod.

7. The force balance experimental device according to any one of claims 1 to 6, characterized in that: It also includes a main control circuit, a mobile power management circuit and a step-down circuit; The mobile power management circuit is used to provide stable charging and discharging for the step-down circuit; The step-down circuit is used to supply power to the displacement sensor, the tilt sensor, the main control circuit, the wired communication circuit and the wireless communication circuit; The main control circuit is used to regulate the above-mentioned circuits and components according to instructions sent by the user.

8. The force balance experimental device according to claim 2, characterized in that: The lengths of both sides of the lever cantilever range from 15 to 50 cm, with a graduation value of 0.1 to 1 cm, wherein each of the common contacts is arranged on the same metal strip.

9. The force balance experimental device according to claim 1, characterized in that: The refresh frequency of the displacement sensor is 10-200 Hz.

10. The force balance experimental device according to claim 1, characterized in that: The tilt sensor is a three-axis digital accelerometer.

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