Experiment demonstration device
By designing an experimental demonstration device including support, heavy objects and lever, and automatically completing heavy objects drop and buoyancy measurement using a reducer motor and dynamometer, the cumbersome and complex problems of traditional Archimedes' principle experiments are solved, and the simplification of the experimental process and the intuitiveness of the effect are achieved, which is convenient for students to understand.
Patent Information
- Application Number
- CN202420403064.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-01
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-03-01
AI Technical Summary
The experimental steps of the traditional Archimedes principle are complicated and complicated, and the experimental results are not obvious, making it difficult for students to understand.
An experimental demonstration device is designed, including a support, a weight and a lever connected to the support. The weight is automatically lowered and buoyant measurement is achieved through a gear reduction motor and a dynamometer, simplifying the experimental process.
Through the simplified experimental process, the Archimedes principle is intuitively verified. The experimental process is simple and the effect is clear at a glance, making it easy for students to understand.
Smart Images
Figure CN222825992U_ABST
Abstract
Description
Technical field:
[0001] The utility model relates to the technical field of teaching experiments, in particular to an experiment demonstration device. Background technology:
[0002] The Archimedes principle states that an object immersed in a liquid is subject to a buoyancy equal to the weight of the liquid displaced by the object. In the teaching process, in order to help students better understand and master the Archimedes principle, teaching is usually combined with experiments.
[0003] The traditional experimental steps of Archimedes' principle are: fill an overflow cup with water, place a weighed empty beaker under the water outlet of the overflow cup, use a dynamometer to hang the weight and record the initial value before putting it into the overflow cup. When one-third of the weight is submerged in the water, weigh the beaker with overflowed water and record the change in the dynamometer. Then, subtract the weight of the empty beaker from the weight of the beaker with overflowed water and compare it with the change in the dynamometer. It can be concluded that the increase in gravity of the beaker is equal to the change in the dynamometer, thereby verifying that the buoyancy is equal to the gravity of the displaced liquid. In order to fully verify Archimedes' principle through experiments, experiments in which two-thirds of the weight is submerged in water and the entire weight is submerged in water are usually carried out.
[0004] From the above experimental process, we can see that each experiment needs to calculate the weight difference of the beaker before and after the heavy object is drained, and record the change value of the dynamometer in order to verify the Archimedes principle; the experimental process is cumbersome and complicated, and there are many measurement data. Many students are confused by too much data and cannot directly measure G 排 Numerical value, F cannot be directly obtained through experiments 浮 =G 排 The experiment is not intuitive enough, and it is impossible to deeply understand the Archimedes principle directly through the experiment; in addition, during the experiment, sometimes due to students' unskilled operation, the water discharged from the overflow cup is easy to spill onto the ground, which can easily cause large measurement errors and affect the experimental results. Utility model content:
[0005] The utility model aims to provide an experimental demonstration device to solve the problems that the current Archimedes principle experimental steps are complicated, the experimental effect is not obvious, and it is not easy for students to understand.
[0006] The utility model is implemented by the following technical scheme: an experimental demonstration device, which includes a support, a weight and a lever swingably connected to the support; a first overflow cup is placed on the top surface of one end of the lever, and a second overflow cup filled with liquid is placed on the top surface of the other end of the lever, and the lower part of the first overflow cup is connected with the upper part of the second overflow cup through a connecting pipe; balance screws are respectively screwed on both ends of the lever, and a balance nut is screwed on the balance screw; a bracket is fixed on the support, a reduction motor is fixed on the bracket, a fixed pulley is rotatably provided on the bracket placed above the second overflow cup, a pull rope is wound around the output shaft of the reduction motor, the end of the pull rope is passed around the fixed pulley and is connected to a dynamometer, and the weight movably placed in the second overflow cup is hung on the hook of the dynamometer.
[0007] Furthermore, the support includes a base and a column vertically fixed on the base.
[0008] Furthermore, the middle portion of the lever is connected to the column via a stud.
[0009] Furthermore, two limit screws are fixed on the column above the lever.
[0010] Furthermore, the cup bottom of the first overflow cup and the cup bottom of the second overflow cup are both fixedly connected to the lever.
[0011] Furthermore, a control switch electrically connected to the reduction motor is mounted on the bracket.
[0012] The utility model has the advantages that the pull rope can be retracted and released by controlling the forward and reverse rotation of the reduction motor. Under the guidance of the fixed pulley, the pull rope pulls the weight up and down; the weight is gradually lowered into the water of the second overflow cup. During the process of the weight gradually being submerged in the water of the second overflow cup, the water in the second overflow cup gradually flows into the first overflow cup through the connecting pipe. During this process, the lever will tilt downward toward one end of the second overflow cup until the weight is submerged in the water of the overflow cup. When the weight is stopped from being lowered and there is no water flow in the connecting pipe, the lever returns to the initial balanced state. Therefore, it is shown that the buoyancy of the weight is equal to the weight of the water discharged, that is, it can be proved that F 浮 =G 排 ; When the heavy object is lifted from the water, the lever tilts toward one end of the first overflow cup; therefore, this embodiment can intuitively verify the Archimedes principle through pre-experimental analysis and a simple experimental process. The experimental process is simple, the effect is clear at a glance, and it is easy for students to understand. Description of the drawings:
[0013] Figure 1 It is a structural schematic diagram of the utility model.
[0014] Figure 2 for Figure 1A-direction view.
[0015] The components in the accompanying drawings are marked as follows: support 1, base 1.1, column 1.2, weight 2, lever 3, first overflow cup 4, second overflow cup 5, stud 6, limit screw 7, balance screw 8, balance nut 9, bracket 10, reduction motor 11, fixed pulley 12, pull rope 13, dynamometer 14, control switch 15, connecting pipe 16. Specific implementation method:
[0016] 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.
[0017] In the description of the present invention, it should be noted that the terms "center", "up", "down", "front", "back", "top", "bottom", "left", "right", "vertical", "horizontal", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.
[0018] like Figure 1 and Figure 2 As shown, this embodiment provides an experimental demonstration device, which includes a support 1, a weight 2 and a lever 3 swingably connected to the support 1; the support 1 includes a base 1.1 and a column 1.2 vertically fixed to the base 1.1, the middle part of the lever 3 is connected to the side wall of the column 1.2 through a stud 6, and the lever 3 can swing around the stud 6; a first overflow cup 4 is bonded and fixed to the top surface of one end of the lever 3, and a second overflow cup 5 filled with liquid is bonded and fixed to the top surface of the other end of the lever 3, and the lower part of the first overflow cup 4 is connected to the upper part of the second overflow cup 5 through a connecting pipe 16; the first overflow cup 4 and the second overflow cup 5 are the same in volume and weight, and the distance between the first overflow cup 4 and the stud 6 is equal to the distance between the second overflow cup 5 and the stud 6.
[0019] The two ends of the lever 3 are respectively screwed with a balancing screw 8, and the balancing screw 8 is screwed with a balancing nut 9; by adjusting the position of the balancing nut 9 along the balancing screw 8, the balance of the lever 3 can be adjusted, thereby further ensuring the balance of the lever 3, keeping the lever 3 in a good horizontal state, and improving the intuitiveness of the experiment.
[0020] A bracket 10 is fixed on the support 1, and a reduction motor 11 is fixed on the bracket 10. A fixed pulley 12 is rotatably provided on the bracket 10 placed above the second overflow cup 5. A pull rope 13 is wound around the output shaft of the reduction motor 11. The end of the pull rope 13 is passed around the fixed pulley 12 and is connected to a dynamometer 14. A weight 2 that is movably placed in the second overflow cup 5 is hung on the hook of the dynamometer 14, and the buoyancy value of the weight 2 can be read through the dynamometer 14; a control switch 15 electrically connected to the reduction motor 11 is installed on the bracket 10; during the experiment, the pull rope 13 is pulled by the reduction motor 11 to drive the weight 2 to be automatically placed in the second overflow cup 5, with low labor intensity and reduced manual intervention.
[0021] After water is poured into the second overflow cup 5 to the drain outlet, the lever 3 is kept in a horizontal balanced state by adjusting the balance nut 9. At this time, the gravity at both ends of the lever 3 is equal, which is determined as the initial state before the experiment.
[0022] During the experiment, the switch 15 is used to control the forward and reverse rotation of the reduction motor 11 to realize the retracting and releasing of the pull rope 13. Under the guidance of the fixed pulley 12, the pull rope 13 pulls the weight 2 up and down; the weight 2 is gradually lowered into the water of the second overflow cup 5. During the process of the weight 2 gradually being submerged in the water of the second overflow cup 5, the water in the second overflow cup 5 gradually flows into the first overflow cup 4 through the connecting pipe 16. During this process, the lever 3 will tilt downward toward one end of the second overflow cup 5 until the weight 2 is submerged in the water of the overflow cup 5. When the weight 2 is stopped from being lowered and there is no water flow in the connecting pipe 16, the lever 3 returns to the initial equilibrium state; therefore, it is shown that the buoyancy of the weight 2 is equal to the weight of the water discharged, which can prove that F 浮 =G 排 ; When the weight 2 is lifted from the water, the lever 3 tilts toward one end of the first overflow cup 4; therefore, this embodiment can intuitively verify the Archimedes principle through pre-experimental analysis and a simple experimental process. The experimental process is simple, the effect is clear at a glance, and it is easy for students to understand.
[0023] Two limit screws 7 are fixed on the column 1.2 above the lever 3 to effectively limit the tilt angle of the lever 3. When the lever 3 is tilted, it is prevented that the tilt angle of the lever 3 is too large and the water in the second overflow cup 5 is spilled out.
[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. An experimental demonstration device, characterized in that: It includes a support, a weight, and a lever swingably connected to the support; a first overflow cup is placed on the top surface of one end of the lever, a second overflow cup filled with liquid is placed on the top surface of the other end of the lever, and the lower part of the first overflow cup is connected to the upper part of the second overflow cup through a connecting pipe; balance screws are respectively screwed on both ends of the lever, and a balance nut is screwed on the balance screw; A bracket is fixed on the support, a reduction motor is fixed on the bracket, a fixed pulley is rotatably provided on the bracket placed above the second overflow cup, a pull rope is wound around the output shaft of the reduction motor, the end of the pull rope is passed around the fixed pulley and connected to a dynamometer, and the weight movably placed in the second overflow cup is hung on a hook of the dynamometer.
2. An experimental demonstration device according to claim 1, characterized in that: The support comprises a base and a column vertically fixed on the base.
3. An experimental demonstration device according to claim 2, characterized in that: The middle part of the lever is connected to the column through a stud.
4. An experimental demonstration device according to claim 3, characterized in that: Two limit screws are fixed on the column above the lever.
5. An experimental demonstration device according to claim 1, characterized in that: The cup bottom of the first overflow cup and the cup bottom of the second overflow cup are both fixedly connected to the lever.
6. An experimental demonstration device according to claim 1, characterized in that: A control switch electrically connected to the reduction motor is installed on the bracket.