CN202256708U - Device for measuring gravitational acceleration - Google Patents
Device for measuring gravitational acceleration Download PDFInfo
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- CN202256708U CN202256708U CN201120410027XU CN201120410027U CN202256708U CN 202256708 U CN202256708 U CN 202256708U CN 201120410027X U CN201120410027X U CN 201120410027XU CN 201120410027 U CN201120410027 U CN 201120410027U CN 202256708 U CN202256708 U CN 202256708U
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- cycloid
- gear
- base
- master control
- chip microcomputer
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- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The utility model discloses a device for measuring gravitational acceleration, which mainly comprises a base, a vertical bar, a lifting device, a step motor, a cycle collecting board, a swing thread retracting and releasing device and a singlechip master control board, wherein the vertical bar and the base are fixed together; the swing thread retracting and releasing device and the lifting device are arranged on the top end of the vertical bar; the lifting device is provided with the step motor; and the singlechip master control board is arranged on the base. The device disclosed by the utility model has the technical advantages that the accurate length of a swing thread can be automatically measured; the swing thread is freely retracted and released; the swing times of each experiment can be automatically accumulated and the self-detection capability is provided.
Description
Technical field
The utility model relates to a kind of device of measuring acceleration of gravity, specifically is a kind of experiment with simple pendulum instrument, can directly be used for scientific research measurement and education experiment.
Background technology
At present, known experiment with simple pendulum instrument roughly has following two kinds: one, traditional experiment with simple pendulum instrument, the cycle of the length of pendulum length, the diameter of swing ball and swing all will observe by the experimenter.And meter ruler is often used in the measurement of pendulum length, the precision of meter ruler low (1mm), and the difference owing to human eye can be brought the collimation error when measuring, and so only linear measure longimetry just has very big error.The end user observes survey on the hunting period number of times, because experiment is measured pendulum length when the L with the accumulative total amplifying method, swings a plurality of cycles (general 50 cycles) and weakens the time error that reaches that stopwatch starts and stop to cause.But because number of times is too many, the experimenter calculates the situation in 1/4 cycle even 1/2 cycle possibly less.So traditional experiment with simple pendulum apparatus measures error is big and loaded down with trivial details.Two, through follow-on experiment with simple pendulum instrument, the length of pendulum length immutable (being generally 1.2m) still is to measure with meter ruler but perhaps can change.Still there is error during measurement.The cycle of swing and number of oscillations are no longer by experimenter's record; Change the inner timer timing of programmable chip meter into, cooperate outside high-speed light electric switch or Hall element, this can improve the accuracy of period measurement; But the high-speed light electric switch is expensive, is not suitable for extensive purchase; With the experiment with simple pendulum instrument of band Hall element, Hall element can not surpass 1cm from steel body swing ball, and this has just brought restriction to experimental implementation, in case the distance of Hall element swing ball surpasses 1cm, and the result that just might cause experiment to reform.
Summary of the invention
For overcome existing experiment with simple pendulum apparatus measures pendulum length error big, cost an arm and a leg and write down the limited deficiency of number of oscillations; The utility model provides a kind of device (experiment with simple pendulum instrument) of measuring acceleration of gravity; This experiment with simple pendulum instrument can be measured the precise length (precision 0.157mm) of single pendulum cycloid automatically; And adopt New Type of Chip Microcomputer that light input signal is carried out data storage and processing; Many group experimental result data can be write down, store automatically, and the mean value of many group experimental datas can be accurately calculated.The acceleration of gravity in important city, the storage inside whole nation can be used as the reference of experimental result.
The technical scheme that the utility model adopts is: a kind of device of measuring acceleration of gravity; Mainly comprise base, montant, jacking gear, stepper motor, cycle collection plate, cycloid draw off gear and single-chip microcomputer master control borad; Said montant and base are fixed together; The montant top is provided with cycloid draw off gear and jacking gear, and said jacking gear is provided with stepper motor, and said single-chip microcomputer master control borad is located on the base.
Said cycle collection plate has osculum.Said cycloid draw off gear is connected with cycloid, swing ball, and cycloid passed the osculum on the cycle collection plate.Also be provided with bevel protractor, said cycle collection plate is close to bevel protractor, but is positioned at the top of bevel protractor.Said cycloid draw off gear also is provided with the clamp folder.Be fixed with pulley in the said stepper motor rotating shaft.The length of said montant is 75-90cm, and said base length is that 25-30cm, width are 22-27cm.Be more preferably, the length of said montant is 80.1cm, and said base length is that 27.0cm, width are 25.0cm.
Foregoing device, preferred scheme is that it is main control chip that said single-chip microcomputer master control borad adopts the STC12C5A60S2 single-chip microcomputer.Said single-chip microcomputer master control borad, cycle collection plate and cycloid draw off gear are connected by signal wire.
The utility model has the two large divisions: mechanical part and control section.Mechanical part has: base, montant, cycloid, swing ball, bevel protractor.Control section has: single-chip microcomputer master control borad, cycle collection plate and cycloid draw off gear.Control section is connected by signal wire.Montant, base are fixed together.The cycloid draw off gear is on the top of montant.Bevel protractor is in the centre position of montant (adjustable).The cycle collection plate is close to bevel protractor, but above bevel protractor.The master control borad of single-chip microcomputer is above base.Cycloid passed the osculum of 10cm*2cm on the cycle collection plate.By cycloid draw off gear folding and unfolding cycloid and the accurate length of measuring cycloid indirectly.Gather the swing ball number of hunting period by the cycle collection plate, and cooperate the cycle collection plate to gather out the time of swing ball swing one-period by the single-chip microcomputer master control borad.At last by single-chip microcomputer master control borad basis
The gravity acceleration g that
calculates.And be presented at the result on the liquid crystal display.
The beneficial effect of the utility model is:
1, can measure the length of cycloid automatically.Precision can reach 0.157mm, has saved the trouble of experimenter's reading, and can eliminate the collimation error that the experimenter brings when doing experiment.
2, cycloid acts freely.As long as the experimenter has set the length of cycloid, the utility model can the automatic deploying and retracting cycloid, reaches the length that the experimenter sets.Save cycloid by experimenter's folding and unfolding and measure the trouble of its length.
3, add up the number of oscillations of each experiment automatically.After the experimenter swung swing ball, the trochotron counting apparatus of the utility model write down the number of times of swing ball swing automatically.Avoided the experimenter to count the situation of single pendulum easy error hunting period.
4, the oneself detects.Can detect whether level of base after the utility model energising automatically, and the prompting experimenter adjusts the utility model; When the circular cone pendulum appears in experimenter's misoperation, can send chimes of doom, this operation of prompting experimenter is wrong, should be again in operation once.
5, voice suggestion.Each step operation all has sound prompt function, convenient first this equipment that uses.
Description of drawings
Fig. 1: the structural representation of the utility model; Fig. 2: the front view (FV) of the utility model; Fig. 3: the structural representation of jacking gear; Fig. 4: the circuit diagram of single-chip microcomputer master control borad; Fig. 5: cycle acquisition circuit board figure; Fig. 6: the program flow diagram of the utility model.Wherein 1: jacking gear, 2: montant, 3: cycle collection plate, 4: single-chip microcomputer master control borad, 5:12864 liquid crystal display, 6: key board, 7: power switch, 8: cycloid, 9: swing ball, 10: clamp folder, 11: stepper motor.Aa is a pair of infrared tube; Bb is that another is to infrared tube.
Embodiment
Describe the formation of the utility model in detail below in conjunction with embodiment, but protection domain is not limited.
A kind of device of measuring acceleration of gravity of embodiment; Structure can be with reference to figure 1-5; Mainly comprise base, montant, jacking gear, stepper motor, cycle collection plate, cycloid draw off gear and single-chip microcomputer master control borad, said montant and base are fixed together, and the montant top is provided with cycloid draw off gear and jacking gear; Said jacking gear is provided with stepper motor, and said single-chip microcomputer master control borad is located on the base.Said cycle collection plate has osculum.Said cycloid draw off gear is connected with cycloid, swing ball, and cycloid passed the osculum on the cycle collection plate.Also be provided with bevel protractor, said cycle collection plate is close to bevel protractor, but is positioned at the top of bevel protractor.Said cycloid draw off gear also is provided with the clamp folder.Be fixed with pulley in the said stepper motor rotating shaft.The length of said montant is 80.1cm, and said base length is that 27.0cm, width are 25.0cm.It is main control chip that said single-chip microcomputer master control borad adopts the STC12C5A60S2 single-chip microcomputer.Said single-chip microcomputer master control borad, cycle collection plate and cycloid draw off gear are connected by signal wire.
Fig. 6 is the program flow diagram of the utility model.Initial, cycloid is static to be in the middle of the Aa infrared tube, and it is 5 ° that cycloid is put the Bb pivot angle from Aa.When the experimenter pressed " decline " button, the step number of the automatic opening entry stepper motor of the utility model stopped operating up to stepper motor.Calculate the length of cycloid again according to the formula of inside.The swing cycloid, when cycloid was put the centre position of Aa infrared tube first, the utility model picked up counting, and put one to number of oscillations, and when arriving the centre position of Aa infrared tube more later on, number of oscillations adds one.Up to reaching preset number of oscillations.In case reach preset number of oscillations, the utility model stops timing.The utility model can calculate the acceleration of gravity of this test according to measured data.The principle of cycle collection plate is following: LM358 inside include two independently, the dual operational amplifier of high-gain, internal frequency compensation.Can utilize LM358 to constitute voltage comparator circuit.Regulate slide rheostat R5, can regulate reference voltage value.R1, R3 are divider resistance.The value of regulating R2, R4 can change the voltage of input LM358.Thereby reach the effect of regulating sensitivity.
Claims (10)
1. device of measuring acceleration of gravity; It is characterized in that; Mainly comprise base, montant, jacking gear, stepper motor, cycle collection plate, cycloid draw off gear and single-chip microcomputer master control borad, said montant and base are fixed together, and the montant top is provided with cycloid draw off gear and jacking gear; Said jacking gear is provided with stepper motor, and said single-chip microcomputer master control borad is located on the base.
2. device according to claim 1 is characterized in that, said cycle collection plate has osculum.
3. device according to claim 1 and 2 is characterized in that, said cycloid draw off gear is connected with cycloid, swing ball, and cycloid passed the osculum on the cycle collection plate.
4. device according to claim 1 is characterized in that, also is provided with bevel protractor, and said cycle collection plate is close to bevel protractor, but is positioned at the top of bevel protractor.
5. device according to claim 1 is characterized in that, said cycloid draw off gear also is provided with the clamp folder.
6. device according to claim 1 is characterized in that, is fixed with pulley in the said stepper motor rotating shaft.
7. device according to claim 1 is characterized in that, the length of said montant is 75-90cm, and said base length is that 25-30cm, width are 22-27cm.
8. device according to claim 1 is characterized in that, the length of said montant is 80.1cm, and said base length is that 27.0cm, width are 25.0cm.
9. device according to claim 1 is characterized in that, it is main control chip that said single-chip microcomputer master control borad adopts the STC12C5A60S2 single-chip microcomputer.
10. according to the arbitrary described device of claim 1-9, it is characterized in that said single-chip microcomputer master control borad, cycle collection plate and cycloid draw off gear are connected by signal wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120410027XU CN202256708U (en) | 2011-10-25 | 2011-10-25 | Device for measuring gravitational acceleration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120410027XU CN202256708U (en) | 2011-10-25 | 2011-10-25 | Device for measuring gravitational acceleration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202256708U true CN202256708U (en) | 2012-05-30 |
Family
ID=46117927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120410027XU Expired - Fee Related CN202256708U (en) | 2011-10-25 | 2011-10-25 | Device for measuring gravitational acceleration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202256708U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103985293A (en) * | 2012-12-03 | 2014-08-13 | 曾飞 | Mechanical device and method for compensating time for photoelectric timer |
| CN104318829A (en) * | 2014-10-17 | 2015-01-28 | 郭金虎 | Hall effect based double-digital-display simple pendulum period high-accuracy synchronous measuring device |
-
2011
- 2011-10-25 CN CN201120410027XU patent/CN202256708U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103985293A (en) * | 2012-12-03 | 2014-08-13 | 曾飞 | Mechanical device and method for compensating time for photoelectric timer |
| CN103985293B (en) * | 2012-12-03 | 2016-08-24 | 国家电网公司 | Machinery and the method for time bias is done for phototimer |
| CN104318829A (en) * | 2014-10-17 | 2015-01-28 | 郭金虎 | Hall effect based double-digital-display simple pendulum period high-accuracy synchronous measuring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120530 Termination date: 20121025 |