Physical friction force experiment demonstration device

Abstract

The utility model discloses a physical friction force experiment demonstration device, and relates to the technical field of physics teaching equipment. Guide rail structures are symmetrically and fixedly connected to the upper end of the second supporting plate, the opposite faces of the two guide rail structures are jointly and slidably connected with a movable plate structure, a hooking structure is fixedly connected to one sides of the upper ends of the two first supporting plates, a third supporting plate is fixedly connected to one sides of the opposite faces of the two first supporting plates, and a lifting structure is arranged in the middle of the third supporting plate. The end faces of the bottom walls of the inner cavities of the first square groove plate, the second square groove plate and the third square groove plate are made of different materials, so that the friction coefficients of the end faces of the bottom walls of the inner cavities of the first square groove plate, the second square groove plate and the third square groove plate are different, a user can place a plurality of experimental apparatuses at the same time in the experiment process, and the experiment efficiency is improved. And then a contrast experiment is carried out under the condition that only the unique variable of the friction coefficient is changed, so that the experiment result of the device is more accurate, and students can feel the experiment result more obviously.

Description

Technical Field

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

[0002] In high school physics teaching, demonstration experiments are often required. Since physics is a natural science based on experiments, looking back at the process of the emergence and development of physics, it can be seen that physical experiments have always occupied an extremely important position. Whether it is the establishment and development of classical physics or the progress of modern physics, they are closely related to physical experiments. Through experiments, physics teaching theory can be combined with practice, arouse students' interest in learning, guide students to discover problems, stimulate their desire for knowledge, and thus mobilize their initiative and enthusiasm to learn physics well and guide them to love science. By strengthening experiments, students can not only have a certain perceptual understanding, but more importantly, they can further understand how physical concepts and laws are established on the basis of experiments, thereby effectively helping students form concepts, derive laws, master theories, and correctly and deeply understand physical knowledge. Through experiments, students' observation ability, thinking ability, self-study ability, and the ability to discover, analyze and solve problems are cultivated; students are trained with good experimental methods and basic experimental ability and hands-on ability, and on this basis, their independent work ability and innovation ability are further cultivated.

[0003] Friction is one of the main knowledge points in high school physics teaching. Friction is a common physical phenomenon. When two objects in contact with each other move relative to each other or have a tendency to move relative to each other, a force that hinders relative motion will be generated on the contact surface. This force is called friction. In the process of physics teaching, regarding the teaching content of friction, teachers generally need to use some teaching aids in class to demonstrate the mechanical phenomenon of friction. The use of traditional experimental devices has a great influence on human factors, which makes the teaching process not flexible enough. In addition, the use of traditional experimental devices is very inconvenient, which is not conducive to students' learning and understanding. For some values, teachers are required to manually take measuring tools for measurement, which is time-consuming and labor-intensive, affecting the teaching quality. In order to improve the efficiency of classroom teaching, enhance students' learning interest, save experimental time, and allow students to fully understand and master the principle of friction from a perceptual perspective, a new type of teaching aid is urgently needed to meet the needs of teachers for demonstration and explanation.

[0004] Chinese patent document CN206805871U discloses a high school physics friction force demonstration and comparison experimental device, which includes a base box, an inclined plate, a support rod and a slider, one end of the inclined plate is hinged in the base box through a rotating shaft, the support rod is arranged between the base box and the inclined plate, and is used to adjust the inclination of the inclined plate, a bracket is arranged at the other end of the inclined plate, a pulley is installed on the bracket, a groove is arranged on the surface of the inclined plate, a friction plate is detachably arranged in the groove, the slider is located on the friction plate, a spring dynamometer is arranged at the traction end of the slider, the spring dynamometer is connected to a counterweight metal block through a traction line passing around the pulley, and an angle measuring instrument is also arranged on the base box; however, there are still the following defects in the implementation process:

[0005] Although the device in the above-mentioned document has a simple structure and is easy to operate, it is difficult to accurately control different variables during use. For example, each time a comparative experiment is conducted, a different friction plate needs to be replaced for the experiment. The display of the experimental phenomenon is not obvious enough, and it is difficult to help students quickly understand the impact of different variables on physical experiments. Summary of the invention

[0006] The purpose of the utility model is to provide a physical friction force experiment demonstration device to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0008] A physical friction experiment demonstration device comprises two support plates 1; the opposing surfaces of the two support plates 1 are rotatably connected with support plate 2, the upper ends of the support plates 2 are symmetrically fixedly connected with guide rail structures, the opposing surfaces of the two guide rail structures are slidably connected with a movable plate structure, one side of the upper ends of the two support plates 1 is fixedly connected with a hook structure, one side of the opposing surfaces of the two support plates 1 is fixedly connected with support plate 3, a lifting structure is arranged in the middle of the support plate 3, the lifting structure is used to adjust the horizontal height of a side of the support plate 2 close to the lifting structure, and the side of the lower end of the support plate 2 close to the lifting structure is rotatably connected to the upper part of the lifting structure.

[0009] A further improvement of the technical solution of the utility model is that the guide rail structure includes a connecting plate 1, a lower end of the connecting plate is fixedly connected to an upper end of a supporting plate 2, a sliding groove 1 is provided on a side of the connecting plate 1 close to the movable plate structure, and a sliding groove 2 is provided on a side of the connecting plate 1 away from the sliding groove 1.

[0010] The above technical solution is adopted, in which a slide groove is opened on one side of the connecting plate close to the movable plate structure, so that the moving track of the movable plate structure is limited by the slide groove, so as to avoid the moving track of the movable plate structure being misaligned during the experiment, thereby affecting the experimental results.

[0011] A further improvement of the technical solution of the utility model is that the movable plate structure includes a first square slot plate, one side of the first square slot plate is fixedly connected to the second square slot plate, the side of the second square slot plate away from the first square slot plate is fixedly connected to the third square slot plate, the sides of the first square slot plate and the third square slot plate away from each other are fixedly connected to slide plates, and the sides of the two slide plates away from each other are threadedly connected with bolt 1.

[0012] The above technical solution is adopted, in which a first square slot plate, a second square slot plate and a third square slot plate are provided, so that three experimental instruments can be placed on the device at one time, and then when other factors are the same, only the friction coefficient is changed to reduce the influence of other factors on the experimental results, thereby making the experimental results more accurate, and during the experiment, allowing students to feel the experimental results more intuitively.

[0013] A further improvement of the technical solution of the utility model is that the end surface of the bottom wall of the inner cavity of the first square groove plate is made of smooth material, the end surface of the bottom wall of the inner cavity of the second square groove plate is made of frosted material, and the end surface of the bottom wall of the inner cavity of the third square groove plate is made of cowhide material.

[0014] The above technical solution is adopted, in which the friction coefficient is changed by making the end faces of the inner cavity bottom wall of the first square groove plate, the second square groove plate and the third square groove plate with different materials, and then during use, the user does not need to replace different friction plates.

[0015] A further improvement of the technical solution of the utility model is that the slide plate is T-shaped, and the outer surface of the slide plate is slidably connected with an inner cavity of the slide groove.

[0016] The above technical solution is adopted, in which the slide plate and the slide groove cooperate with each other, so that the guide rail structure is used to support the movable plate structure and limit the moving track of the movable plate structure.

[0017] A further improvement of the technical solution of the utility model is that the hook connection structure comprises a connecting plate 2, wherein the connecting plate 2 has a sliding groove 3 on one side close to the movable plate structure, and a plurality of fixed hooks are slidably connected to the inner cavity of the sliding groove 3.

[0018] The above technical solution is adopted, in which the positions of the fixed hooks can be moved according to needs through the cooperation of the slide slot three and a plurality of fixed hooks, making the device more flexible during the experiment.

[0019] A further improvement of the technical solution of the utility model is that the lifting structure includes a plurality of support blocks, a lower end of the plurality of support blocks is fixedly connected to an upper end of a third support plate, the plurality of support blocks are rotatably connected to a worm, an outer surface of the worm is meshingly connected to a worm wheel, a lower part of the worm wheel is rotatably connected to an annular block, the lower end of the annular block is fixedly connected to an upper end of a third support plate, a bolt is threadedly connected to an inner cavity of the annular block, and the upper end of the bolt is rotatably connected to a lower end of a second support plate.

[0020] The above technical solution is adopted, in which the worm is meshed with the worm wheel, thereby driving the worm wheel to rotate around the annular block, and then driving the worm wheel to rotate the second bolt, and then driving the second bolt thread to rotate and rise.

[0021] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0022] 1. The utility model provides a physical friction experiment demonstration device, which is provided with a first square slot plate, a second square slot plate and a third square slot plate, and at the same time, the first square slot plate, the second square slot plate and the third square slot plate have inner cavity bottom wall end faces made of different materials, so that the friction coefficients of the inner cavity bottom wall end faces of the first square slot plate, the second square slot plate and the third square slot plate are different. Then, during the experiment, the user can place multiple experimental equipment at the same time, and then conduct comparative experiments when only the single variable of the friction coefficient is changed, so that the experimental results of the device are more accurate, and students can feel the experimental results more clearly.

[0023] 2. The utility model provides a physical friction experiment demonstration device, which utilizes the worm to perform meshing motion on the worm wheel, thereby driving the worm wheel to rotate, and then utilizes the worm wheel to drive bolt two to rotate, so that the bolt two can perform threaded rotation and lifting, and then the rotation angle of the support plate two is adjusted according to demand, so that the device is more flexible during use, thereby improving the practicability and universality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 It is a front view of the overall structure of the utility model;

[0027] Figure 3 This is a schematic diagram of the guide rail structure of the utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the movable plate of the utility model;

[0029] Figure 5 This is a schematic diagram of the hook connection structure of the utility model;

[0030] Figure 6 This is a schematic diagram of the lifting structure of the utility model;

[0031] In the figure: 1. support plate one; 2. guide rail structure; 21. connecting plate one; 22. slide slot one; 23. slide slot two; 3. support plate two; 4. movable plate structure; 41. first square slot plate; 42. second square slot plate; 43. third square slot plate; 44. slide plate; 45. bolt one; 5. hook structure; 51. connecting plate two; 52. slide slot three; 53. fixing hook; 6. support plate three; 7. lifting structure; 71. support block one; 72. worm; 73. worm wheel; 74. annular block; 75. bolt two. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the embodiments:

[0033] Example 1

[0034] like Figure 1-6 As shown, the utility model provides a physical friction experiment demonstration device, comprising two support plates 1; the opposite surfaces of the two support plates 1 are rotatably connected with a support plate 2 3, the upper ends of the support plates 2 3 are symmetrically fixedly connected with a guide rail structure 2, the opposite surfaces of the two guide rail structures 2 are slidably connected with a movable plate structure 4, one side of the upper ends of the two support plates 1 is fixedly connected with a hook structure 5, one side of the opposite surfaces of the two support plates 1 is fixedly connected with a support plate 3 6, a lifting structure 7 is arranged in the middle of the support plate 3 6, the lifting structure 7 is used to adjust the horizontal height of the side of the support plate 2 3 close to the lifting structure 7, and the side of the lower end of the support plate 2 3 close to the lifting structure 7 is rotatably connected to the upper part of the lifting structure 7.

[0035] In this embodiment, the device is supported by support plate 1, the moving track of movable plate structure 4 is limited by guide rail structure 2 to prevent the movable plate structure 4 from deviating during movement, the movable plate structure 4 is supported by support plate 2 3, and experimental variables with different friction coefficients are provided for the experiment by movable plate structure 4, the elastic dynamometer is connected to the device by hook structure 5, the lifting structure 7 is supported by support plate 3 6, and the lifting structure 7 drives one side of support plate 2 3 to adjust its height.

[0036] Example 2

[0037] like Figure 4 and Figure 5As shown, on the basis of Example 1, the utility model provides a technical solution: preferably, the movable plate structure 4 includes a first square slot plate 41, a second square slot plate 42 is fixedly connected to one side of the first square slot plate 41, a third square slot plate 43 is fixedly connected to the side of the second square slot plate 42 away from the first square slot plate 41, a slide plate 44 is fixedly connected to the side of the first square slot plate 41 and the third square slot plate 43 away from each other, and a bolt 45 is threadedly connected to the side of the two slide plates 44 away from each other, the end surface of the bottom wall of the inner cavity of the first square slot plate 41 is smooth, the end surface of the bottom wall of the inner cavity of the second square slot plate 42 is frosted, and the end surface of the bottom wall of the inner cavity of the third square slot plate 43 is cowhide, the slide plate 44 is T-shaped, and the outer surface of the slide plate 44 is slidably connected to the inner cavity of the slide groove 22, and the hook structure 5 includes a connecting plate 2 51, a connecting plate 2 51, and a slide groove 3 52 is provided on the side of the connecting plate 2 51 close to the movable plate structure 4, and a plurality of fixed hooks 53 are slidably connected to the inner cavity of the slide groove 3 52.

[0038] In this embodiment, a plurality of fixing hooks 53 are positioned in the inner cavity of the slide groove three 52 as required, and then a plurality of spring dynamometers are connected to the fixing hooks 53 on one side, and then a plurality of wooden blocks with hooks are placed on the inner cavity bottom wall end surfaces of the first square groove plate 41, the second square groove plate 42 and the third square groove plate 43 respectively, and then the other side of the spring dynamometer is connected to the hook of the wooden block with hooks, and then the user releases the position limitation of the slide plate 44 by turning a plurality of bolts 45.

[0039] Example 3

[0040] like Figure 3 As shown, based on Example 2, the utility model provides a technical solution: preferably, the guide rail structure 2 includes a connecting plate 21, the lower end of the connecting plate 21 is fixedly connected to the upper end of the support plate 3, a sliding groove 22 is provided on the side of the connecting plate 21 close to the movable plate structure 4, and a sliding groove 23 is provided on the side of the connecting plate 21 away from the sliding groove 22.

[0041] In this embodiment, the user holds the movable plate structure 4 away from the side of the hook structure 5 and pulls the movable plate structure 4 to move, thereby driving the slide plate 44 to slide in the inner cavity of the slide groove 22, and the bolt 45 to slide in the inner cavity of the slide groove 23. During the movement of the movable plate structure 4, the hooked wooden block will be driven to move, thereby pulling the spring dynamometer to operate. When the user moves the movable plate structure 4 to a certain position, the spring dynamometer will clearly reflect the experimental results, so that students can intuitively see the experimental results when only the friction coefficient is changed.

[0042] Example 4

[0043] like Figure 6As shown, on the basis of Example 3, the utility model provides a technical solution: preferably, the lifting structure 7 includes a plurality of support blocks 71, the lower ends of the plurality of support blocks 71 are fixedly connected to the upper ends of the support plates 3 6, the plurality of support blocks 71 are rotatably connected together with a worm 72, the outer surface of the worm 72 is meshingly connected with a worm wheel 73, the lower part of the worm wheel 73 is rotatably connected with an annular block 74, the lower end of the annular block 74 is fixedly connected to the upper end of the support plates 3 6, the inner cavity of the annular block 74 is threadedly connected with a bolt 2 75, and the upper end of the bolt 2 75 is rotatably connected to the lower end of the support plates 2 3.

[0044] In this embodiment, when other experiments need to be conducted and the height of one side of the movable plate structure 4 needs to be adjusted, the user rotates the worm 72 to allow the worm 72 to engage with the adjacent worm wheel 73, thereby driving the worm wheel 73 to rotate, and then driving the bolt 2 75 to rotate, so that the bolt 2 75 can be raised or lowered as needed, and then driving the support plate 2 3 and the movable plate structure 4 to be raised or lowered, thereby changing the height of one side of the movable plate structure 4, and then conducting other experiments.

[0045] The following is a detailed description of the working principle of the physical friction experiment demonstration device.

[0046] like Figure 1-6 As shown, when an experiment is needed, firstly, a plurality of fixing hooks 53 are positioned in the inner cavity of the slide slot 3 52 according to the needs, and then a plurality of spring dynamometers are connected to the fixing hooks 53 on one side, and then a plurality of wooden blocks with hooks are placed on the inner cavity bottom wall end surfaces of the first square slot plate 41, the second square slot plate 42 and the third slot plate 43, respectively, and then the other side of the spring dynamometer is connected to the hook of the wooden block with hooks, and then the user releases the position limitation of the slide plate 44 by turning a plurality of bolts 1 45;

[0047] Then the user holds the movable plate structure 4 away from the hook structure 5 and pulls the movable plate structure 4 to move, thereby driving the slide plate 44 to slide in the inner cavity of the slide groove 1 22, and the bolt 1 45 to slide in the inner cavity of the slide groove 23. During the movement of the movable plate structure 4, the wooden block with the hook is driven to move, thereby pulling the spring dynamometer to operate. When the user moves the movable plate structure 4 to a certain position, the spring dynamometer will clearly reflect the experimental results, so that students can intuitively see the experimental results when only the friction coefficient is changed as the only variable.

[0048] When other experiments need to be conducted and the height of one side of the movable plate structure 4 needs to be adjusted, the user rotates the worm 72 to make the worm 72 mesh with the adjacent worm wheel 73, thereby driving the worm wheel 73 to rotate, and then driving the bolt 2 75 to rotate, so that the bolt 2 75 can be raised or lowered as needed, and then driving the support plate 2 3 and the movable plate structure 4 to be raised or lowered, thereby changing the height of one side of the movable plate structure 4, and then conducting other experiments.

[0049] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A physical friction force experimental demonstration device, comprising two support plates (1); characterized in that: The opposing surfaces of the two support plates (1) are rotatably connected to support plate (2), the upper ends of the support plates (3) are symmetrically fixedly connected to guide rail structures (2), the opposing surfaces of the two guide rail structures (2) are slidably connected to movable plate structures (4), one side of the upper ends of the two support plates (1) is fixedly connected to a hook structure (5), one side of the opposing surfaces of the two support plates (1) is fixedly connected to support plate (3) (6), a lifting structure (7) is arranged in the middle of the support plate (6), the lifting structure (7) is used to adjust the horizontal height of the side of the support plate (3) close to the lifting structure (7), and the side of the lower end of the support plate (3) close to the lifting structure (7) is rotatably connected to the upper part of the lifting structure (7).

2. A physical friction force experimental demonstration device according to claim 1, characterized in that: The guide rail structure (2) comprises a connecting plate 1 (21), the lower end of the connecting plate 1 (21) being fixedly connected to the upper end of the supporting plate 2 (3), a sliding groove 1 (22) being provided on a side of the connecting plate 1 (21) close to the movable plate structure (4), and a sliding groove 2 (23) being provided on a side of the connecting plate 1 (21) away from the sliding groove 1 (22).

3. A physical friction force experimental demonstration device according to claim 2, characterized in that: The movable plate structure (4) comprises a first square slot plate (41), one side of the first square slot plate (41) is fixedly connected to a second square slot plate (42), the side of the second square slot plate (42) away from the first square slot plate (41) is fixedly connected to a third square slot plate (43), the sides of the first square slot plate (41) and the third square slot plate (43) away from each other are both fixedly connected to a slide plate (44), and the sides of the two slide plates (44) away from each other are both threadedly connected to a bolt 1 (45).

4. A physical friction force experimental demonstration device according to claim 3, characterized in that: The end surface of the inner cavity bottom wall of the first square slot plate (41) is made of smooth material, the end surface of the inner cavity bottom wall of the second square slot plate (42) is made of frosted material, and the end surface of the inner cavity bottom wall of the third square slot plate (43) is made of cowhide material.

5. A physical friction force experimental demonstration device according to claim 3, characterized in that: The slide plate (44) is T-shaped, and the outer surface of the slide plate (44) is slidably connected to the inner cavity of the slide groove (22).

6. A physical friction force experimental demonstration device according to claim 3, characterized in that: The hook connection structure (5) comprises a second connecting plate (51), wherein a third sliding groove (52) is provided on a side of the second connecting plate (51) close to the movable plate structure (4), and a plurality of fixed hooks (53) are slidably connected to the inner cavity of the third sliding groove (52).

7. A physical friction force experimental demonstration device according to claim 2, characterized in that: The lifting structure (7) comprises a plurality of support blocks (71), the lower ends of the plurality of support blocks (71) being fixedly connected to the upper ends of the support plates (6), the plurality of support blocks (71) being rotatably connected to a worm (72), the outer surface of the worm (72) being meshingly connected to a worm wheel (73), the lower part of the worm wheel (73) being rotatably connected to an annular block (74), the lower end of the annular block (74) being fixedly connected to the upper end of the support plate (6), the inner cavity of the annular block (74) being threadedly connected to a bolt (75), the upper end of the bolt (75) being rotatably connected to the lower end of the support plate (3).

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