CN113496640A - Totally-enclosed small rail car system for measuring speed and acceleration - Google Patents
Totally-enclosed small rail car system for measuring speed and acceleration Download PDFInfo
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- CN113496640A CN113496640A CN202010258750.4A CN202010258750A CN113496640A CN 113496640 A CN113496640 A CN 113496640A CN 202010258750 A CN202010258750 A CN 202010258750A CN 113496640 A CN113496640 A CN 113496640A
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- 229910000831 Steel Inorganic materials 0.000 claims description 7
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- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000123 paper Substances 0.000 description 15
- 238000002474 experimental method Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
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- 238000010586 diagram Methods 0.000 description 4
- 239000011087 paperboard Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/08—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics
- G09B23/10—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics of solid bodies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/03—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses by using non-electrical means
- G01P15/032—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses by using non-electrical means by measuring the displacement of a movable inertial mass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
- G01P3/68—Devices characterised by the determination of the time taken to traverse a fixed distance using optical means, i.e. using infrared, visible, or ultraviolet light
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Abstract
The invention discloses a totally-enclosed rail trolley system for measuring speed and acceleration, which comprises a front end support, a rear end support and an aluminum alloy rail, wherein two ends of the aluminum alloy rail are respectively and fixedly connected with the front end support and the rear end support, scales are arranged on the aluminum alloy rail, a trolley is arranged between the aluminum alloy rails and is in sliding connection with the aluminum alloy rail, lifting bolts are arranged on two sides of the bottom end of the front end support and are fixedly connected with the front end support in a threaded manner, a limiting bolt is arranged on one side of the front end support and is positioned below the aluminum alloy rail and is in contact with the bottom end of the trolley, a support supporting plate is fixedly arranged on one side of the front end support, and a buffer sponge is arranged on one side of the rear end support. According to the invention, the totally-enclosed rail trolley system is adopted, and other measurement means are matched, so that the experimental operation which can be completed within forty-five minutes can be completed within fifteen minutes, the efficiency is improved by three times, and the data are stable and the effect is good.
Description
Technical Field
The invention relates to the technical field related to physical experiment teaching, in particular to a totally-enclosed rail trolley system for measuring speed and acceleration.
Background
In the process of teaching physical experiments, particularly in experiments for exploring the relationship between acceleration and the stress and mass of an object, the acceleration of the trolley under various conditions is required to be measured rapidly, stably, accurately and repeatedly for many times, so that the corresponding rail trolley system is required to be used for measurement.
However, the existing system consisting of the flat plate and the experimental trolley is used for measuring the speed or the acceleration, and the movement track of the trolley is easy to deviate from a straight line and even turn out from the tail end of the track to fall on the ground; the friction of the wheels is unstable, and the constant resultant external force of a small vehicle in an experiment cannot be ensured; the tail end buffer mechanism of the track is unstable, the trolley is easy to rush out of the track and fall off the ground to cause damage, and as a result, the conventional instrument causes troublesome experiment operation, unstable data and high instrument damage rate, and the conventional dotting timer and paper tape are used for recording the movement of the trolley, so that the speed or acceleration of the trolley is measured, but the dotting timer and the paper tape are troublesome to install and inconvenient to operate, and the experiment error is large; or the air cushion guide rail, the photoelectric door and the displacement sensor are used for combined measurement, but the installation and debugging are more troublesome, the operation is more complicated, the efficiency is low, and the improvement is needed.
Disclosure of Invention
The invention aims to provide a totally-enclosed rail trolley system for measuring speed and acceleration, which aims to solve the problems that the prior system consisting of a flat plate and an experimental trolley is used for measuring speed or acceleration, the moving track of the trolley is easy to deviate from a straight line and even turn out from the tail end of the track to fall on the ground; the friction of the wheels is unstable, and the constant resultant external force of a small vehicle in an experiment cannot be ensured; the tail end buffer mechanism of the track is unstable, the trolley is easy to rush out of the track and fall off the ground to cause damage, and the conventional dotting timer and a paper tape are used for recording the movement of the trolley, so that the speed or the acceleration of the trolley is measured, but the dotting timer and the paper tape are troublesome to install and inconvenient to operate, and the experimental error is large; or the air cushion guide rail, the photoelectric door and the displacement sensor are used for combined measurement, but the installation and debugging are more troublesome, the operation is more complicated, and the efficiency is low.
In order to achieve the purpose, the invention provides the following technical scheme: a totally-enclosed rail trolley system for measuring speed and acceleration comprises a front end support, a rear end support and an aluminum alloy rail, wherein two ends of the aluminum alloy rail are respectively and fixedly connected with the front end support and the rear end support, scales are arranged on the aluminum alloy rail, a trolley is arranged between the aluminum alloy rails and is in sliding connection with the aluminum alloy rail, lifting bolts are arranged on two sides of the bottom end of the front end support and are in threaded fixed connection with the front end support, a limiting bolt is arranged on one side of the front end support and is positioned below the aluminum alloy rail and is in contact with the bottom end of the trolley, a support supporting plate is fixedly arranged on one side of the front end support, a buffer sponge is arranged on one side of the rear end support and is positioned below the aluminum alloy rail, a pulley frame is arranged on the other side of the rear end support, and a fixed pulley is arranged on the pulley frame, the fixed pulley is wound with a traction rope, one end of the traction rope is fixedly connected with the trolley, the other end of the traction rope is connected with a counterweight, an extension support is arranged below the pulley yoke, and one end of the extension support is fixedly connected with the rear end support.
Preferably, the side wall of the aluminum alloy track is provided with a sliding groove, the two sides of the trolley are provided with wheels, the wheels are buckled in the sliding groove, and the trolley is connected with the aluminum alloy track in a sliding mode through the wheels and the sliding groove.
Preferably, a circular groove is formed in the trolley, a clamping groove and a paperboard steel wire are arranged at one end of the trolley, and a radial clamping groove used for installing the light blocking sheet is formed in the other end of the trolley.
Preferably, the portable counting machine further comprises a counting timer, the counting timer is installed on the support supporting plate through a fixing clamp, a paper tape is arranged on the counting timer, and one end of the paper tape is fixedly connected with the trolley through a clamping groove and a paper clamping steel wire.
Preferably, still include the photoelectric door subassembly, the photoelectricity subassembly includes first photoelectric door support and second photoelectric door support, first photoelectric door support and second photoelectric door support are all installed in the aluminum alloy track upper end, and the horizontal straight flute that first photoelectric door support and second photoelectric door support all were equipped with through the aluminum alloy track surface is pegged graft with the aluminum alloy track, first photoelectric door support and second photoelectric door support all are connected with signal reception terminal through the wire.
Preferably, the signal receiving terminal is any one of a digital timer and a computer system.
Preferably, still include displacement sensor subassembly, digital collector and force sensor, it includes transmitter and receiver to move the sensor subassembly, the transmitter passes through strong magnetic chuck and dolly fixed connection, receiver fixed mounting is on the support layer board, force sensor fixing card is on extending the support, it all is connected with digital collector through the wire to move sensor subassembly and force sensor, digital collector passes through the wire and is connected with the computer.
Preferably, the mobile phone also comprises a mobile phone, and the mobile phone is fixedly adsorbed on the trolley through a strong magnetic chuck.
The invention provides a totally-enclosed rail trolley system for measuring speed and acceleration, which has the following beneficial effects:
(1) according to the invention, the totally-enclosed rail trolley system is adopted, and other measurement means are matched, so that the experimental operation which can be completed within forty-five minutes can be completed within fifteen minutes, the efficiency is improved by three times, and the data are stable and the effect is good.
(2) The trolley runs in a very smooth track in a completely closed mode, the tail end of the trolley is provided with the buffer sponge, the trolley is controlled not to deviate from the track and fall off, friction is small, and running is stable; the front end support, the rear end support, the aluminum alloy track and the trolley body are provided with components which are convenient to install, debug, operate and have extensible functions, four methods for measuring the speed, the acceleration and the stress of the trolley are developed and integrated, the experimental efficiency can be effectively improved, the experimental error is reduced, the experimental effect is improved, the measurement means of the experiment is enriched, and the experimental ability of students is favorably cultured.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic side view of the present invention;
FIG. 3 is a schematic structural diagram of embodiment 2 of the present invention;
FIG. 4 is a schematic structural diagram of embodiment 3 of the present invention;
FIG. 5 is a schematic structural diagram of embodiment 4 of the present invention;
fig. 6 is a schematic structural diagram of embodiment 5 of the present invention.
In the figure: 1. a front end bracket; 2. a rear end bracket; 3. a buffer sponge; 4. an aluminum alloy rail; 5. calibration; 6. a trolley; 7. a circular groove; 8. a strong magnetic chuck; 9. a hauling rope; 10. a pulley yoke; 11. a fixed pulley; 12. counterweight weights; 13. an extension bracket; 14. a lifting bolt; 15. a bracket pallet; 16. a limiting bolt; 17. a dotting timer; 18. a paper strap; 19. a fixing clip; 20. a first photogate support; 21. a second photogate support; 22. a horizontal straight groove; 23. a signal receiving terminal; 24. a displacement sensor emitter; 25. a receiver; 26. a digital collector; 27. a force sensor; 28. provided is a mobile phone.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1:
as shown in fig. 1-2, the present invention provides a technical solution: a totally-enclosed rail trolley system for measuring speed and acceleration comprises a front end support 1, a rear end support 2 and an aluminum alloy rail 4, wherein two ends of the aluminum alloy rail 4 are respectively fixedly connected with the front end support 1 and the rear end support 2, scales 5 are arranged on the aluminum alloy rail 4, a trolley 6 is arranged between the aluminum alloy rails 4, the trolley is in sliding connection with the aluminum alloy rail 4, lifting bolts 14 are arranged on two sides of the bottom end of the front end support 1, the lifting bolts 14 are fixedly connected with the front end support 1 through threads, a limiting bolt 16 is arranged on one side of the front end support 1, the limiting bolt 16 is positioned below the aluminum alloy rail 4 and is in contact with the bottom end of the trolley 6, a support plate 15 is fixedly arranged on one side of the front end support 1, a buffer sponge 3 is arranged on one side of the rear end support 2, and the buffer sponge 3 is positioned below the aluminum alloy rail 4, pulley yoke 10 is installed to 2 opposite sides of rear end support, install fixed pulley 11 on the pulley yoke 10, the winding is equipped with haulage rope 9 on the fixed pulley 11, 9 one end of haulage rope and 6 fixed connection of dolly, and the haulage rope 9 other end is connected with counter weight 12, pulley yoke 10 below is equipped with extends support 13, extend support 13 one end and rear end support 2 fixed connection.
The side wall of the aluminum alloy track 4 is provided with a sliding groove, the two sides of the trolley 6 are provided with wheels, the wheels are buckled in the sliding groove, and the trolley 6 is connected with the aluminum alloy track 4 in a sliding mode through the wheels and the sliding groove, so that the body of the trolley 6 can be suspended on the track, the gravity center is slightly lower than the suspension point, and the stability of the trolley 6 in running in the track is improved.
The round groove 7 is formed in the trolley 6, the clamping groove and the paperboard steel wire are formed in one end of the trolley, the radial clamping groove used for installing the light blocking sheet is formed in the other end of the trolley 6, operation in a test is facilitated, and experiment efficiency is improved.
The totally-enclosed small rail car system for measuring the speed and the acceleration has the advantages that when the totally-enclosed small rail car system works, the limiting bolt 16 is pressed down to enable the small car to move smoothly along an aluminum alloy rail, so that the speed measurement of the small car is realized, and meanwhile, weights can be added in the circular groove 7 to change the mass of the small car; the height of the front end support 1 is adjusted through the lifting bolt 14, so that the inclination of the aluminum alloy rail is adjusted, multiple measurements are completed, and the device is simple to operate, good in flexibility and convenient to use.
Example 2:
as shown in fig. 3, a totally enclosed small rail car system for measuring speed and acceleration is substantially the same as that of embodiment 1, and further comprises a dotting timer 17, wherein the dotting timer 17 is mounted on a support supporting plate 15 through a fixing clamp 19, a paper tape 18 is arranged on the dotting timer 17, and one end of the paper tape 18 is fixedly connected with the car 6 through a clamping groove and a steel wire paperboard.
The totally-enclosed small rail car system for measuring the speed and the acceleration is characterized in that when the totally-enclosed small rail car system works, a dotting timer 17 can be fixed on a support supporting plate 15 of a front end support 1 through a fixing clamp 19, a paper tape 18 penetrates through a limiting hole of the dotting timer 17 and is inserted into a paper clamping groove in the back of a small car 6, a paper clamping steel wire is pressed down, the paper tape is pressed tightly, a switch of the dotting timer 17 is switched on, a limiting bolt 16 is pressed down, the small car is released, one-time measurement can be completed, meanwhile, scales 5 on an aluminum alloy rail 4 can facilitate positioning of the small car 6 or measurement of the distance between counting points in the paper tape 18, and in the measuring process, weights can be added in a circular groove 7 to change the mass of the small car; the height of the front end support 1 is adjusted through the lifting bolt 14, so that the inclination of the aluminum alloy rail is adjusted, multiple measurements are completed, and the device is simple to operate, good in flexibility and convenient to use.
Example 3:
as shown in fig. 4, a totally-enclosed track trolley system for measuring speed and acceleration is substantially the same as that in embodiment 1, and further includes a photoelectric door assembly, where the photoelectric door assembly includes a first photoelectric door support 20 and a second photoelectric door support 21, the first photoelectric door support 20 and the second photoelectric door support 21 are both installed at the upper end of the aluminum alloy track 4, the first photoelectric door support 20 and the second photoelectric door support 21 are both inserted into the aluminum alloy track 4 through a horizontal straight groove 22 formed in the surface of the aluminum alloy track 4, and the first photoelectric door support 20 and the second photoelectric door support 21 are both connected to a signal receiving terminal 23 through a wire.
The signal receiving terminal 23 is any one of a digital timer and a computer system.
When the totally-enclosed rail trolley system for measuring speed and acceleration works, a first photoelectric door support 20 and a second photoelectric door support 21 are clamped at any position on an aluminum alloy guide rail 4 through a horizontal straight groove 22, then the first photoelectric door support 20 and the second photoelectric door support 21 are connected with a digital timer or a computer system through data lines, after initialization preparation is completed, a limit bolt 16 is used for releasing the trolley, and one-time measurement can be completed; in the measuring process, weights can be added in the circular groove 7 to change the mass of the trolley; the height of the front end support 1 is adjusted through the lifting bolt 14, so that the inclination of the aluminum alloy rail is adjusted, multiple measurements are completed, and the device is simple to operate, good in flexibility and convenient to use.
Example 4:
as shown in fig. 5, a totally enclosed small rail car system for measuring speed and acceleration is substantially the same as that of embodiment 1, and further includes a displacement sensor assembly, a digital collector 26 and a force sensor 27, wherein the displacement sensor assembly includes a transmitter 24 and a receiver 25, the transmitter 24 is fixedly connected with the car 6 through a ferromagnetic chuck 8, the receiver 25 is fixedly mounted on a support supporting plate 15, the force sensor 27 is fixedly clamped on an extension support 13, the displacement sensor assembly and the force sensor 27 are both connected with the digital collector 26 through wires, and the digital collector 26 is connected with a computer through wires.
It should be noted that, a totally-enclosed small rail car system for measuring speed and acceleration, when working, uses the displacement sensor and force sensor 27 in the DIS digital experiment system to measure, the emitter 24 of the displacement sensor is fixed by the strong magnetic chuck 8 installed on the surface of the car, the receiver 25 is fixed on the bracket supporting plate 15, the force sensor 27 is directly clamped on the extension bracket 13, both sensors are connected with the digital collector 26, then connected with the computer, at the same time, the hauling rope 9 crosses the fixed pulley 11, one end of the hauling rope 9 is connected with the car 6, the other end of the hauling rope 9 is connected with the force sensor 27, then the light and small movable pulley is used to hang the counterweight 12, completes the experiment initialization preparation, presses the limit bolt 16, releases the car, and can complete one-time measurement; in the measuring process, weights can be added in the circular groove 7 to change the mass of the trolley; the height of the front end support 1 is adjusted through the lifting bolt 14, so that the inclination of the aluminum alloy rail is adjusted, multiple measurements are completed, and the device is simple to operate, good in flexibility and convenient to use.
Example 5:
as shown in fig. 6, a totally enclosed rail car system for measuring speed and acceleration, which is substantially the same as embodiment 1, further comprises a mobile phone 28, wherein the mobile phone 28 is also fixedly attached to the car 6 through a strong magnetic chuck 8.
The totally-enclosed small rail car system for measuring the speed and the acceleration is characterized in that when the totally-enclosed small rail car system works, the mobile phone APP is used for measuring the acceleration, and the force sensor 27 is used for measuring the tension of a thin rope; as shown in fig. 6, a mobile phone 28 is mounted on a trolley 6 through a strong magnetic chuck 8, a force sensor 27 is mounted on an extension support 13, a computer is accessed through a digital collector 26, a traction rope 9 penetrates through a movable pulley, the force sensor 27 is hung at the other end of the traction rope, a clockwork weight 12 is hung on the movable pulley, an experiment is started, an APP at the end of the mobile phone 28 is opened, acceleration measurement is started, a limit bolt 16 is pressed down, the trolley is released, a stopping experiment is clicked on the mobile phone 28, and one experiment measurement is completed; in the measuring process, weights can be added in the circular groove 7 to change the mass of the trolley; the height of the front end support 1 is adjusted through the lifting bolt 14, so that the inclination of the aluminum alloy rail is adjusted, multiple measurements are completed, and the device is simple to operate, good in flexibility and convenient to use.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A totally-enclosed rail trolley system for measuring speed and acceleration is characterized by comprising a front end support (1), a rear end support (2) and an aluminum alloy track (4), wherein two ends of the aluminum alloy track (4) are respectively fixedly connected with the front end support (1) and the rear end support (2), scales (5) are arranged on the aluminum alloy track (4), a trolley (6) is arranged between the aluminum alloy tracks (4), the trolley is slidably connected with the aluminum alloy tracks (4), lifting bolts (14) are arranged on two sides of the bottom end of the front end support (1), the lifting bolts (14) are fixedly connected with the front end support (1) through threads, a limiting bolt (16) is arranged on one side of the front end support (1), the limiting bolt (16) is positioned below the aluminum alloy tracks (4), the limiting bolt (16) is in contact with the bottom end of the trolley (6), a support supporting plate (15) is fixedly arranged on one side of the front end support (1), rear end support (2) one side is installed and is cushioned sponge (3), cushion sponge (3) are located aluminum alloy track (4) below, pulley yoke (10) are installed to rear end support (2) opposite side, install fixed pulley (11) on pulley yoke (10), the winding is equipped with haulage rope (9) on fixed pulley (11), haulage rope (9) one end and dolly (6) fixed connection, and haulage rope (9) other end is connected with counter weight (12), pulley yoke (10) below is equipped with extends support (13), extend support (13) one end and rear end support (2) fixed connection.
2. The totally-enclosed small rail car system for measuring speed and acceleration as claimed in claim 1, wherein a sliding groove is formed in a side wall of the aluminum alloy rail (4), wheels are arranged on both sides of the small car (6), the wheels are internally buckled in the sliding groove, and the small car (6) is slidably connected with the aluminum alloy rail (4) through the wheels and the sliding groove.
3. The fully enclosed small rail car system for measuring velocity and acceleration according to claim 1, wherein: the novel light blocking film fixing device is characterized in that a circular groove (7) is formed in the trolley (6), a clamping groove and a paper clamping steel wire are arranged at one end of the trolley, and a radial clamping groove used for installing a light blocking sheet is formed in the other end of the trolley (6).
4. The totally-enclosed small rail car system for measuring speed and acceleration according to claim 1, further comprising a dotting timer (17), wherein the dotting timer (17) is installed on the support supporting plate (15) through a fixing clamp (19), a paper tape (18) is arranged on the dotting timer (17), and one end of the paper tape (18) is fixedly connected with the small car (6) through a clamping groove and a paper clamping steel wire.
5. The fully-closed rail trolley system for measuring speed and acceleration according to claim 1, further comprising a photoelectric door assembly, wherein the photoelectric door assembly comprises a first photoelectric door support (20) and a second photoelectric door support (21), the first photoelectric door support (20) and the second photoelectric door support (21) are both installed at the upper end of the aluminum alloy rail (4), the first photoelectric door support (20) and the second photoelectric door support (21) are both inserted into the aluminum alloy rail (4) through a horizontal straight groove (22) formed in the surface of the aluminum alloy rail (4), and the first photoelectric door support (20) and the second photoelectric door support (21) are both connected with a signal receiving terminal (23) through a conducting wire.
6. A totally enclosed trolley system for measuring speed and acceleration according to claim 5 characterized in that the signal receiving terminal (23) is any one of a digital timer or a computer system.
7. The totally-enclosed small rail car system for measuring speed and acceleration according to claim 1, further comprising a displacement sensor assembly, a digital collector (26) and a force sensor (27), wherein the displacement sensor assembly comprises a transmitter (24) and a receiver (25), the transmitter (24) is fixedly connected with the small car (6) through a strong magnetic chuck (8), the receiver (25) is fixedly installed on a support supporting plate (15), the force sensor (27) is fixedly clamped on an extension support (13), the displacement sensor assembly and the force sensor (27) are both connected with the digital collector (26) through wires, and the digital collector (26) is connected with a computer through wires.
8. The totally-enclosed trolley system for measuring speed and acceleration according to claim 1, further comprising a mobile phone (28), wherein the mobile phone (28) is also fixedly attached to the trolley (6) through a strong magnetic suction cup (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010258750.4A CN113496640A (en) | 2020-04-03 | 2020-04-03 | Totally-enclosed small rail car system for measuring speed and acceleration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010258750.4A CN113496640A (en) | 2020-04-03 | 2020-04-03 | Totally-enclosed small rail car system for measuring speed and acceleration |
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| CN113496640A true CN113496640A (en) | 2021-10-12 |
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| CN202010258750.4A Pending CN113496640A (en) | 2020-04-03 | 2020-04-03 | Totally-enclosed small rail car system for measuring speed and acceleration |
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| CN202332002U (en) * | 2011-11-17 | 2012-07-11 | 杭州久良科技发展有限公司 | Demonstration instrument of small rail car |
| CN203562121U (en) * | 2013-11-13 | 2014-04-23 | 杨亮 | Physical-trolley instantaneous speed demonstration instrument |
| CN205984037U (en) * | 2016-06-16 | 2017-02-22 | 上海中科现代实验室设备有限公司 | Novel track saddle |
| CN208607825U (en) * | 2017-12-28 | 2019-03-15 | 浙江师范大学 | A kind of uniformly accelrated rectilinear motion digital experiment device |
| CN208580523U (en) * | 2018-04-26 | 2019-03-05 | 张雪峰 | A kind of physics experiments of high school teaching aid model |
| CN209232227U (en) * | 2018-05-25 | 2019-08-09 | 浙江胜昔信息科技有限公司 | A kind of experimental provision for probing into Newton's second law |
| CN208873358U (en) * | 2018-06-14 | 2019-05-17 | 刘会 | A kind of teaching appliance for probing into function Yu velocity variations relationship |
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Application publication date: 20211012 |