CN209746883U - Free fall laboratory bench for physics teaching experiments - Google Patents
Free fall laboratory bench for physics teaching experiments Download PDFInfo
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- CN209746883U CN209746883U CN201920114717.7U CN201920114717U CN209746883U CN 209746883 U CN209746883 U CN 209746883U CN 201920114717 U CN201920114717 U CN 201920114717U CN 209746883 U CN209746883 U CN 209746883U
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Abstract
the utility model relates to the technical field of teaching aids, in particular to a free fall experiment table for physical teaching experiments, which comprises a platform with a square plate structure and a plurality of support legs fixedly arranged on the bottom surface of the platform; a wheel carrier is fixedly arranged at the left end of the platform, and a grooved wheel is rotatably arranged on the wheel carrier; a dotting timer is fixedly arranged on the upper surface of the platform, and a supporting block with a square plate structure is fixedly arranged on the upper surface of the platform on the right side of the dotting timer; the grooved pulley, the dotting timer and the supporting block are aligned along the length direction of the platform; a fixed column of a square rod structure is vertically and fixedly arranged on the upper surface of the supporting block, and an electromagnet is fixedly arranged on the front side of the fixed column; the lower surface of the electromagnet is fixedly connected with a spring, and the lower end of the spring is fixedly connected with a disc; a circular shaft is fixedly welded at the central position of the disc; the disc is located in the middle of the circular shaft. The utility model discloses easily make, convenient to use has better practical value and spreading value.
Description
Technical Field
The utility model relates to a teaching aid technical field, concretely relates to free fall laboratory bench for physics teaching experiments.
Background
At present, along with the innovation of the new class standard of the education department, the content of the experiment part of the physics teaching of middle school is regulated, the requirement of the physics experiment classroom on the current teaching is also paid attention to, and in the teaching process, the proportion of the experiment course is also correspondingly increased. However, to do the physics experiment, then must assist the demonstration with the help of physics teaching experiment teaching aid, so can make things convenient for the teacher to demonstrate experiment operation, convenient teaching and student understand.
However, although a plurality of teaching aids are provided for physical teaching at present, the teaching aids for free fall movement are still quite lacking, and the teaching aids are not beneficial to teacher experiment teaching.
Therefore, based on the above, the utility model provides a free fall laboratory bench for physical teaching experiments, through the overall structure design of this laboratory bench, make the teacher in experiment teaching process, can demonstrate the operation with the free fall experiment, satisfy teaching experiment needs, and then solve not enough and the defect that prior art exists.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a: to the above-mentioned problem that exists at present, provide a free fall laboratory bench for physical teaching experiments, through the overall structure design of this laboratory bench, make the teacher at the experiment teaching in-process, can demonstrate the operation with the free fall experiment, satisfy the teaching experiment needs, and then solve not enough and the defect that prior art exists.
In order to realize the purpose, the utility model discloses a technical scheme is:
A free falling body experiment table for physical teaching experiments comprises a platform with a square plate structure and a plurality of support legs fixedly arranged on the bottom surface of the platform; a wheel carrier is fixedly arranged at the left end of the platform, and a grooved wheel is rotatably arranged on the wheel carrier; a dotting timer is fixedly arranged on the upper surface of the platform, and a supporting block with a square plate structure is fixedly arranged on the upper surface of the platform on the right side of the dotting timer; the grooved pulley, the dotting timer and the supporting block are aligned along the length direction of the platform; a fixed column of a square rod structure is vertically and fixedly arranged on the upper surface of the supporting block, and an electromagnet is fixedly arranged on the front side of the fixed column; the lower surface of the electromagnet is fixedly connected with a spring, and the lower end of the spring is fixedly connected with a disc; a circular shaft is fixedly welded at the central position of the disc; the disc is positioned in the middle of the round shaft, and the upper end of the round shaft is positioned in the inner hole of the spring; a square collecting tank is arranged at the left part of the rear side of the platform; the right side of the collecting tank is of an opening structure; an upper frame is fixedly connected and installed at the upper position of the collecting tank through a square plate; the appearance of the upper frame is of a square frame structure, and an upper groove of a square hole structure is arranged in the middle of the frame of the upper frame; a plate groove with a square groove structure is formed in the right side of the lower portion of the upper frame, a square inserting plate is installed inside the plate groove in a matched mode, and a circular operation hole is formed in the right end of the inserting plate; an inclined platform is fixedly installed on a platform on the right side of the collecting tank, the inclined surface of the inclined platform inclines towards the left lower side, and the inclined surface is a smooth circular arc-shaped surface; an arc-shaped groove is formed in the middle of the inclined surface; the cross section of the arc-shaped groove is of a semicircular groove structure, and the side surface of the arc-shaped groove is of an arc-shaped structure; the upper part of the platform is also provided with a switch which is connected with the striking timer and the electromagnet through conducting wires.
preferably, the number of the supporting legs is 4, and the top ends of the supporting legs and the bottom surface of the platform are fixedly connected into an integral structure; the legs are located at 4 corner positions of the bottom surface of the platform.
Preferably, it is characterized in that: the wheel carrier is formed by symmetrically installing 2 square plates, and round installation holes are symmetrically arranged on the square plates; mounting shafts matched with the mounting holes are symmetrically and fixedly arranged on two sides of the grooved wheel, and the mounting shafts are arranged in the mounting holes in a clearance fit manner.
preferably, the right end of the plate groove is of an opening structure, and the width of the plate groove is greater than the width of the upper groove of the upper frame and smaller than the width of the frame profile of the upper frame.
preferably, the width of the left end of the inclined table is smaller than the width of the right side of the collecting tank; the inserting plate and the plate groove are detachably installed in a clearance fit mode. The round shaft is a magnetic metal shaft, the disc is a magnetic metal disc, and the round shaft and the disc are welded and fixed into an integral structure.
Here, it should be noted that the electromagnet used in the present invention is a product of the elike (elecalal) brand, and the specific model may be ELE-P20/1524 v. The dotting timer can be an electromagnetic dotting timer, the related switch is also a product in the prior art, the switch can be selected from a knife switch and a button switch, and the position of the switch can be unfixed. The electric connection and the specific structure of the product are all means of the prior art, and a person skilled in the art can understand that particularly an electromagnetic dotting timer is a device which is very common for measuring uniform acceleration motion in a physical experiment.
Simultaneously, the spring in this application, for being in compression state's spring, be also that the spring withstands the supporting shoe after, be in compression state, just so can push down the paper tape through the round axle. In addition, the terms of fixing, fixing and setting and the like referred to in the present application refer to fixing by means of fixing welding, screwing and the like, and fixing means between components are various.
In a specific use process, the application can realize the following operations:
And (3) measuring and calculating the speed of the uniform acceleration linear motion: the left end of the paper tape to be measured is clamped by a clamp, a weight is hung at the lower end of the clamp, the left end of the paper tape is placed in a wheel groove of a grooved wheel, and the left lower end of the paper tape is suspended in the air. And then, the right end of the paper tape penetrates through a dotting timer, a dotting needle head is ensured to correspond to the paper tape, the right end of the paper tape is arranged on the supporting block, and the circular shaft is driven to abut against the right end of the paper tape to press and fix the right end of the paper tape through the elastic action of the spring, so that the left end of the paper tape is prevented from sliding. Before the switch is opened, the paper tape is guaranteed to be flat. And finally, turning on a switch to simultaneously electrify the dotting timer and the electromagnet, instantly attracting the circular shaft upwards after the electromagnet is electrified, simultaneously electrifying the dotting timer, making the paper tape do uniform accelerated linear motion under the action of the gravity of the weight, making the paper tape pass through the dotting timer, and marking marks on the paper tape through a dotting needle of the dotting timer. After the experiment is finished, the distance between the adjacent marks is measured, the movement speed of the paper tape at different moments is calculated, and the free falling body movement is verified to be uniform acceleration linear movement.
Free fall motion of different mass objects: put into the groove with the solid experimental object of different masses, for example ball etc. then take out the picture peg from the board groove in the twinkling of an eye, the ball that puts in the groove this moment begins to drop to the collecting tank almost simultaneously, and the teacher alright can observe through the experiment this moment, or with the help of video capture equipment such as high-speed camera, catch the phenomenon in the twinkling of an eye that falls to the ground to judge the free fall motion, the reality has no relation with the weight of object, and its main action derives from gravity. In order to verify the effect of buoyancy, chicken feather, cotton and other objects can be used for experiments, which shows that the movement speed of the objects is greatly influenced under the conditions of small gravity and large air buoyancy.
Energy conservation verification: the ball is placed in the arc-shaped groove and falls from different heights, the movement condition of the ball along the arc-shaped curve is observed, and the law of conservation of energy can be verified by measuring the initial falling height of the ball and the instantaneous speed of the ball leaving the arc-shaped groove. Namely, the relationship between the initial gravitational potential energy and the kinetic energy of the sphere is verified. The collecting groove is used for collecting objects such as small balls falling off in the experimental process.
Since the technical scheme is used, the beneficial effects of the utility model are that:
On the one hand, the utility model discloses on combining the platform with the experimental scheme auxiliary teaching aid of difference, make things convenient for the teacher to carry out special subject experiment demonstration and research, do benefit to the experiment teaching demonstration.
On the other hand, the conventional experiment of uniform linear motion usually adopts a mode of manually operating the paper tape, namely manually pinching the paper tape, and then starting the dotting timer and then releasing the hand. However, the tape operated manually usually has errors in the experimental process, for example, the dots are more densely printed at the beginning stage, and it is difficult to judge the correct initial position, which is not favorable for the accuracy of measurement. Through the design of this scheme, by the direct simultaneous control electro-magnet of switch and the timer of dotting, so can reduce measuring error at to a great extent, further improve the degree of accuracy of measuring numerical value.
On the other hand, the utility model discloses experimental apparatus simple structure, it is convenient to make, not only can satisfy the speed measurement experiment requirement of even linear motion with higher speed, verifies the free fall motion and really is even linear motion with higher speed, but also can verify the free fall motion condition of the object of different masses, does benefit to the experiment demonstration teaching and guides the student to observe experiment, analysis problem. In addition, experiments such as energy conservation and the like are introduced into the experiment table, the relation between knowledge systems is established, the spatial position of the experiment table is fully utilized, and the experiment table has good practical value and popularization value.
Drawings
Fig. 1 is a schematic structural view of the front side of the present invention;
Fig. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic view of the structure of the upper frame of the present invention;
Fig. 4 is a schematic diagram of the circuit connection structure of the present invention.
In the figure: 1. a support leg; 2. a platform; 3. collecting tank; 4. a grooved wheel; 5. putting on a shelf; 6. a plate groove; 7. inserting plates; 8. an operation hole; 9. an upper groove; 10. a dotting timer; 11. a support block; 12. a circular shaft; 13. a disc; 14. a spring; 15. an electromagnet; 16. fixing a column; 17. a sloping table; 18. an arc-shaped slot; 19. a wheel carrier; 20. and (4) switching.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the accompanying drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solution in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, rather than all embodiments, based on the embodiments in the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of the present invention.
Example 1, as shown in figures 1-4:
A free falling body experiment table for physical teaching experiments comprises a platform 2 with a square plate structure and a plurality of support legs 1 fixedly arranged on the bottom surface of the platform 2; a wheel frame 19 is fixedly arranged at the left end of the platform 2, and a grooved wheel 4 is rotatably arranged on the wheel frame 19; a dotting timer 10 is fixedly arranged on the upper surface of the platform 2, and a supporting block 11 with a square plate structure is fixedly arranged on the upper surface of the platform 2 on the right side of the dotting timer 10; the sheave 4, the striking timer 10 and the supporting block 11 are aligned along the length direction of the platform 2; a fixed column 16 with a square rod structure is vertically and fixedly installed on the upper surface of the supporting block 11, and an electromagnet 15 is fixedly installed on the front side of the fixed column 16; the lower surface of the electromagnet 15 is fixedly connected with a spring 14, and the lower end of the spring 14 is fixedly connected with a disc 13; a circular shaft 12 is fixedly welded at the central position of the disc 13; the disc 13 is positioned in the middle of the circular shaft 12, and the upper end of the circular shaft 12 is positioned in an inner hole of the spring 14; a square collecting tank 3 is arranged at the left part of the rear side of the platform 2; the right side of the collecting tank 3 is of an opening structure; an upper frame 5 is fixedly connected and installed above the collecting tank 3 through a square plate; the appearance of the upper frame 5 is of a square frame structure, and an upper groove 9 of a square hole structure is arranged in the middle of the frame of the upper frame 5; a plate groove 6 with a square groove structure is formed in the right side of the lower portion of the upper frame 5, a square inserting plate 7 is installed inside the plate groove 6 in a matched mode, and a circular operation hole 8 is formed in the right end of the inserting plate 7; an inclined platform 17 is fixedly arranged on the platform 2 on the right side of the collecting tank 3, the inclined surface of the inclined platform 17 inclines towards the lower left side, and the inclined surface is a smooth arc-shaped surface; an arc-shaped groove 18 is formed in the middle of the inclined surface; the cross section of the arc-shaped groove 18 is of a semicircular groove structure, and the side surface of the arc-shaped groove 18 is of an arc-shaped structure; the upper part of the platform 2 is also provided with a switch 20, and the switch 20 is electrically connected with the striking timer 10 and the electromagnet 15 through leads.
Preferably, the number of the supporting legs 1 is 4, and the top ends of the supporting legs 1 and the bottom surface of the platform 2 are fixedly connected into an integral structure; the legs 1 are located at 4 corner positions of the bottom surface of the platform 2.
preferably, it is characterized in that: the wheel carrier 19 is formed by symmetrically installing 2 square plates, and round installation holes are symmetrically arranged on the square plates; mounting shafts matched with the mounting holes are symmetrically and fixedly arranged on two sides of the grooved pulley 4, and the mounting shafts are arranged in the mounting holes in a clearance fit manner.
Preferably, the right end of the plate groove 6 is of an open structure, and the width of the plate groove 6 is greater than the width of the upper groove 9 of the upper frame 5 and less than the width of the frame profile of the upper frame 5.
preferably, the left end width of the sloping platform 17 is smaller than the right side width of the collecting tank 3; the insertion plate 7 and the plate groove 6 are detachably installed in a clearance fit mode. The circular shaft 12 is a magnetic metal shaft, and the disc 13 is a magnetic metal disc.
Here, the electromagnet 15 used in the present invention is a product of the elike (elecalal) brand, and the specific model may be ELE-P20/1524 v. The dotting timer 10 can be an electromagnetic dotting timer 10, the related switch is also a product in the prior art, the switch can be selected from a knife switch and a button switch, and the position of the switch can be unfixed. The electrical connection and the specific structure of the above products are all means of the prior art, and those skilled in the art can understand that, in particular, the electromagnetic striking timer 10 is a device which is very commonly used for measuring uniform acceleration motion in a physical experiment.
In a specific use process, the application can realize the following operations:
And (3) measuring and calculating the speed of the uniform acceleration linear motion: the left end of the paper tape to be measured is clamped by a clamp, a weight is hung at the lower end of the clamp, the left end of the paper tape is placed in a wheel groove of the grooved wheel 4, and the left lower end of the paper tape is suspended in the air. And then, the right end of the paper tape penetrates through a dotting timer 10, a dotting needle is ensured to correspond to the paper tape, the right end of the paper tape is arranged on a supporting block 11, and a circular shaft 12 is driven to abut against the right end of the paper tape through the elastic action of a spring 14 to press and fix the right end of the paper tape, so that the left end of the paper tape is prevented from sliding. Before the switch 20 is opened, the paper strip is guaranteed to be flat. And finally, turning on a switch 20 to simultaneously electrify the dotting timer 10 and the electromagnet 15, instantly attracting the circular shaft 12 upwards after the electromagnet 15 is electrified, simultaneously electrifying the dotting timer 10, making the paper tape do uniform accelerated linear motion under the action of the gravity of the weight, enabling the paper tape to penetrate through the dotting timer 10, and marking marks on the paper tape through a dotting needle of the dotting timer. After the experiment is finished, the distance between the adjacent marks is measured, the movement speed of the paper tape at different moments is calculated, and the free falling body movement is verified to be uniform acceleration linear movement.
Free fall motion of different mass objects: put into upper groove 9 with the solid experimental object of different masses, for example ball, then take out picture peg 7 from board groove 6 in the twinkling of an eye, the ball that puts in upper groove 9 this moment begins to drop to collecting tank 3 almost simultaneously, the teacher alright through the experiment observation this moment, or with the help of video capture equipment such as high-speed camera, catch the phenomenon in the twinkling of an eye that falls to the ground to judge the free fall motion, it does not have the relation with the weight of object in fact, its main action derives from gravity. In order to verify the effect of buoyancy, chicken feather, cotton and other objects can be used for experiments, which shows that the movement speed of the objects is greatly influenced under the conditions of small gravity and large air buoyancy.
Energy conservation verification: the sphere is placed in the arc-shaped groove 18 and falls from different heights, the movement condition of the sphere along the arc-shaped curve is observed, and the law of energy conservation can be verified by measuring the initial falling height of the sphere and the instantaneous speed of the sphere leaving the arc-shaped groove 18. Namely, the relationship between the initial gravitational potential energy and the kinetic energy of the sphere is verified. The collecting groove 3 is used for collecting objects such as small balls falling off in the experimental process.
on the one hand, the utility model discloses on combining platform 2 with the experimental scheme auxiliary teaching aid of difference, make things convenient for the teacher to carry out special subject experiment demonstration and research, do benefit to the experiment teaching demonstration.
On the other hand, in the conventional experiment of uniform linear motion, the paper tape is usually manually operated, that is, the paper tape is manually pinched, and then the hand is released after the dotting timer 10 is started. However, the tape operated manually usually has errors in the experimental process, for example, the dots are more densely printed at the beginning stage, and it is difficult to judge the correct initial position, which is not favorable for the accuracy of measurement. Through the design of this scheme, by the direct simultaneous control electro-magnet 15 of switch and beat timer 10, so can reduce measuring error at to a great extent, further improve the degree of accuracy of measuring numerical value.
On the other hand, the utility model discloses experimental apparatus simple structure, it is convenient to make, not only can satisfy the speed measurement experiment requirement of even linear motion with higher speed, verifies the free fall motion and really is even linear motion with higher speed, but also can verify the free fall motion condition of the object of different masses, does benefit to the experiment demonstration teaching and guides the student to observe experiment, analysis problem. In addition, experiments such as energy conservation and the like are introduced into the experiment table, the relation between knowledge systems is established, the spatial position of the experiment table is fully utilized, and the experiment table has good practical value and popularization value.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The utility model provides a free fall laboratory bench for physics teaching experiments which characterized in that: the device comprises a platform with a square plate structure and a plurality of support legs fixedly arranged on the bottom surface of the platform; a wheel carrier is fixedly arranged at the left end of the platform, and a grooved wheel is rotatably arranged on the wheel carrier; a dotting timer is fixedly arranged on the upper surface of the platform, and a supporting block with a square plate structure is fixedly arranged on the upper surface of the platform on the right side of the dotting timer; the grooved pulley, the dotting timer and the supporting block are aligned along the length direction of the platform; a fixed column of a square rod structure is vertically and fixedly arranged on the upper surface of the supporting block, and an electromagnet is fixedly arranged on the front side of the fixed column; the lower surface of the electromagnet is fixedly connected with a spring, and the lower end of the spring is fixedly connected with a disc; a circular shaft is fixedly welded at the central position of the disc; the disc is positioned in the middle of the round shaft, and the upper end of the round shaft is positioned in the inner hole of the spring; a square collecting tank is arranged at the left part of the rear side of the platform; the right side of the collecting tank is of an opening structure; an upper frame is fixedly connected and installed at the upper position of the collecting tank through a square plate; the appearance of the upper frame is of a square frame structure, and an upper groove of a square hole structure is arranged in the middle of the frame of the upper frame; a plate groove with a square groove structure is formed in the right side of the lower portion of the upper frame, a square inserting plate is installed inside the plate groove in a matched mode, and a circular operation hole is formed in the right end of the inserting plate; an inclined platform is fixedly installed on a platform on the right side of the collecting tank, the inclined surface of the inclined platform inclines towards the left lower side, and the inclined surface is a smooth circular arc-shaped surface; an arc-shaped groove is formed in the middle of the inclined surface; the cross section of the arc-shaped groove is of a semicircular groove structure, and the side surface of the arc-shaped groove is of an arc-shaped structure; the upper part of the platform is also provided with a switch which is connected with the striking timer and the electromagnet through conducting wires.
2. The free-fall laboratory bench for physics teaching experiments as claimed in claim 1, wherein: the number of the supporting legs is 4, and the top ends of the supporting legs are fixedly connected with the bottom surface of the platform into an integral structure; the legs are located at 4 corner positions of the bottom surface of the platform.
3. The free-fall laboratory bench for physics teaching experiments as claimed in claim 1, wherein: the wheel carrier is formed by symmetrically installing 2 square plates, and round installation holes are symmetrically arranged on the square plates; mounting shafts matched with the mounting holes are symmetrically and fixedly arranged on two sides of the grooved wheel, and the mounting shafts are arranged in the mounting holes in a clearance fit manner.
4. The free-fall laboratory bench for physics teaching experiments as claimed in claim 1, wherein: the right end of the plate groove is of an opening structure, and the width of the plate groove is larger than the width of the upper groove of the upper frame and smaller than the width of the frame outline of the upper frame.
5. The free-fall laboratory bench for physics teaching experiments as claimed in claim 1, wherein: the width of the left end of the inclined table is smaller than the width of the right side of the collecting groove; the insert plate and the half groove are detachably installed in a clearance fit mode.
6. The free-fall laboratory bench for physics teaching experiments as claimed in claim 1, wherein: the round shaft is a magnetic metal shaft, the disc is a magnetic metal disc, and the round shaft and the disc are welded and fixed into an integral structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920114717.7U CN209746883U (en) | 2019-01-23 | 2019-01-23 | Free fall laboratory bench for physics teaching experiments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920114717.7U CN209746883U (en) | 2019-01-23 | 2019-01-23 | Free fall laboratory bench for physics teaching experiments |
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| Publication Number | Publication Date |
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| CN209746883U true CN209746883U (en) | 2019-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920114717.7U Expired - Fee Related CN209746883U (en) | 2019-01-23 | 2019-01-23 | Free fall laboratory bench for physics teaching experiments |
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| CN (1) | CN209746883U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111804365A (en) * | 2020-08-12 | 2020-10-23 | 潘佳妮 | Middle school physics is learnt and is used laboratory bench |
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2019
- 2019-01-23 CN CN201920114717.7U patent/CN209746883U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111804365A (en) * | 2020-08-12 | 2020-10-23 | 潘佳妮 | Middle school physics is learnt and is used laboratory bench |
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Granted publication date: 20191206 Termination date: 20210123 |