CN202485991U - Rigid material strain test instrument - Google Patents
Rigid material strain test instrument Download PDFInfo
- Publication number
- CN202485991U CN202485991U CN2012201371895U CN201220137189U CN202485991U CN 202485991 U CN202485991 U CN 202485991U CN 2012201371895 U CN2012201371895 U CN 2012201371895U CN 201220137189 U CN201220137189 U CN 201220137189U CN 202485991 U CN202485991 U CN 202485991U
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- CN
- China
- Prior art keywords
- foil gauge
- strain
- wheatstone bridge
- fixed
- binding post
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a rigid material strain test instrument which comprises a Wheatstone bridge circuit. A strain foil RX is fixed on the upper face of a cantilever beam 3 of a rigid material to be tested and is in parallel connection with a strain foil binding post 7 on the Wheatstone bridge circuit, the strain foil RX is installed on the right side of a clamp 2 which is fixed on a base 1, the cantilever beam 3 is fixed on the clamp 2, the right end of the cantilever beam 3 is connected with a weight 4 through a suspension rope 5, a temperature compensating strain foil R1 is fixed on the upper face of the cantilever beam 3 and is in parallel connection with a temperature compensating binding post 6, and the temperature compensating strain foil R1 is installed on the left side of the clamp 2. The rigid material strain test instrument can conveniently measure strain of the cantilever beam 3, can eliminate errors caused by temperature variation, and overcomes the defects of a complex structure and use inconvenience of a strain measurement test instrument in the prior art. The rigid material strain test instrument can be applied to mechanics physical experiments of colleges and universities.
Description
Technical field
The utility model relates to a kind of colleges and universities and uses physical experiment apparatus, especially refers to a kind of rigid body material strain experiment instrument.
Background technology
Resistance strain type sensor (the utility model abbreviation foil gauge) principle of work is based on the resistance strain effect principle.Be made into resistance strain gage with the metallic resistance silk, it is sticked on the rubber-like rigid body, when the rigid body stress deformation, also in company with distortion together, its resistance value generation respective change converts voltage or change in current into through change-over circuit to the sensitive grid of foil gauge.Foil gauge can be applied to rigid body material strain experiment instrument, but the rigid body material strain experiment instrument complex structure of prior art uses inconvenience, and can not eliminate because the variation of temperature errors caused.
Summary of the invention
The purpose of the utility model provides a kind of rigid body material strain experiment instrument simple in structure, easy to use, and it can eliminate the temperature variation errors caused.
To achieve these goals, the utility model comprises Wheatstone bridge circuit, foil gauge R
XBe fixed on the top of semi-girder 3 and parallelly connected, foil gauge R with the foil gauge binding post 7 on the Wheatstone bridge circuit
XBe installed in the right side of anchor clamps 2.Anchor clamps 2 are fixed on the base 1, and semi-girder 3 is fixed on the anchor clamps 2.The right-hand member of semi-girder 3 and suspension wire 5 upper ends join, and the lower end of suspension wire 5 and counterweight 4 join.Temperature compensation foil gauge R
1Be fixed on the top of semi-girder 3 and parallelly connected with the temperature compensation binding post 6 on the Wheatstone bridge circuit.Temperature compensation foil gauge R
1Be installed in the left side of anchor clamps 2.
Wheatstone bridge circuit is installed in the inside of base 1, temperature compensation binding post 6 and the foil gauge binding post 7 and second resistance R of Wheatstone bridge circuit
2With the 3rd resistance R
3All be installed on the shell of base 1 with the adjusting knob of protective resistance R, galvanometer G and K switch also will be installed on the shell of base 1.
Because the utility model is foil gauge R
XBe fixed on semi-girder 3 above, and parallelly connected with the foil gauge binding post 7 on the Wheatstone bridge circuit, foil gauge R
XBe installed in the right side of anchor clamps 2, semi-girder 3 is fixed on the anchor clamps 2, and the right-hand member of semi-girder 3 and counterweight 4 join, temperature compensation foil gauge R
1Parallelly connected with the temperature compensation binding post 6 on the Wheatstone bridge circuit, just can measure the increased resistance value of semi-girder 3 under different stressing conditions easily, thereby calculate the strain numerical value of semi-girder 3.
Because temperature compensation foil gauge R
1With foil gauge R
XBe same material and specification, and be under the same environment temperature that variation of temperature is brought, and both resistance variations are consistent, this has just offset the measuring error that both temperature variation cause, improved measuring accuracy.
Because Wheatstone bridge circuit is installed in the inside of base 1, and each tunable component of Wheatstone bridge circuit all is installed on the shell of base 1, and this has just simplified apparatus structure, has reduced cost, has improved the convenience that instrument uses.
Description of drawings
Fig. 1 is the principle schematic of the mechanical part of the utility model.
Fig. 2 is the circuit theory diagrams of the utility model.
Embodiment
In Fig. 1, base 1 is rectangular housing, and anchor clamps 2 usefulness screws are fixed on base 1 upper surface.Anchor clamps 2 are clamped the left side of semi-girder 3, are structure (the available the sort of physical construction that is similar to little bench vice clamping object) that can installation and removal between anchor clamps 2 and the semi-girder 3.Foil gauge R
XWith the method for pasting be fixed on semi-girder 3 above, and foil gauge R
XBe installed in the right side of anchor clamps 2.The upper end of the right-hand member of semi-girder 3 and suspension wire 5 joins, and the lower end of suspension wire 5 and counterweight 4 join.Counterweight 4 can add or reduce for the counterweight of weights such as a plurality of combines.Temperature compensation foil gauge R
1Be fixed on semi-girder 3 above, temperature compensation foil gauge R
1Be installed in the left side of anchor clamps 2.
In Fig. 2, resistance R
2, R
3Be connected in parallel on after the series connection on the circuit of protective resistance R, direct supply E, K switch series connection; On temperature compensation binding post 5 (forming) and the circuit that also is connected in parallel on protective resistance R, direct supply E, K switch series connection after foil gauge binding post 6 (forming by two) is connected by two.The upper end of galvanometer G links to each other the lower end of galvanometer G and resistance R with the tie point of temperature compensation binding post 6 with foil gauge binding post 7
2, R
3Tie point link to each other.Temperature compensation foil gauge R
1Join with temperature compensation binding post 6; Foil gauge R
XJoin with foil gauge binding post 7.This has just formed Wheatstone bridge, wherein a resistance R
2, R
3Be the direct reading precision resister case of scalable, protective resistance R is rheochord (protective resistance R also can be connected in series in the galvanometer G circuit and go).Combination of circuits when the utility model does not connect other devices to the temperature compensation binding post 6 of Fig. 2 with foil gauge binding post 7 abbreviates Wheatstone bridge circuit as.
For simplified structure, improve the convenience of using, the utility model is installed in Wheatstone bridge circuit the inside of base 1.Temperature compensation binding post 6 and the foil gauge binding post 7 and second resistance R of Wheatstone bridge circuit
2With the 3rd resistance R
3All be installed on the shell of base 1 with the adjusting knob of protective resistance R.Galvanometer G and K switch also will be installed on the shell of base 1.Direct supply E can be with D.C. regulated power supply or dry cell.
The use brief description of the utility model is following: at first on foil gauge binding post 7, connect an external resistance box, and temperature compensation foil gauge R
1Be in parallel with temperature compensation binding post 6.Regulate resistance R
2, R
3And above-mentioned that external resistance box, make galvanometer G convergence zero look number, Wheatstone bridge reaches quasi-equilibrium, thereby calculates temperature compensation foil gauge R
1Resistance value.Remove that external resistance box then, change foil gauge R
X, this just can carry out following strain measurement and test.
See Fig. 1, the quality of shilling counterweight 4 is zero (also promptly pulling down all counterweights on the counterweight 4 entirely), regulates resistance R
2, R
3Make the Wheatstone bridge balance, thereby calculate the foil gauge R under this situation
XOn resistance value, change the quality (each increase identical in quality) of (increases) counterweight 4 more successively, but the meter foil gauge R that calculates the corresponding quality correspondence of counterweight 4 each times just
XOn resistance value; Change the quality (each reduce identical in quality) of (minimizing) counterweight 4 more successively, but also meter is calculated the corresponding foil gauge R of the corresponding quality of counterweight 4 each times
XOn resistance value.In conjunction with above-mentioned two groups of experimental data utilizations by the difference method can be when loading each counterweight foil gauge R
XChange in resistance amount accurate Calculation come out, thereby accurately calculate the strain of semi-girder 3.
Because temperature compensation foil gauge R
1With foil gauge R
XBe same material and specification, and be under the same environment temperature that variation of temperature is brought, and both resistance variations are consistent; After both press the connected mode place in circuit of Fig. 2; Just can offset the error that both temperature variation cause, so, the balance of Wheatstone bridge can not influenced; Thereby also just eliminated the error that temperature variation is brought, improved measuring accuracy.
Claims (2)
1. a rigid body material strain experiment instrument comprises Wheatstone bridge circuit, foil gauge (R
X) be fixed on the top of semi-girder (3) and parallelly connected, foil gauge (R with the foil gauge binding post (7) on the Wheatstone bridge circuit
X) be installed in the right side of anchor clamps (2); It is characterized in that anchor clamps (2) are fixed on the base (1), semi-girder (3) is fixed on the anchor clamps (2), and the right-hand member of semi-girder (3) and suspension wire (5) upper end join; The lower end of suspension wire (5) and counterweight (4) join, temperature compensation foil gauge (R
1) be fixed on the top of semi-girder (3) and parallelly connected, temperature compensation foil gauge (R with the temperature compensation binding post (6) on the Wheatstone bridge circuit
1) be installed in the left side of anchor clamps (2).
2. by the described rigid body material strain of claim 1 experiment instrument, it is characterized in that Wheatstone bridge circuit is installed in the inside of base (1), the temperature compensation binding post (6) of Wheatstone bridge circuit and foil gauge binding post (7) and the second resistance (R
2) and the 3rd resistance (R
3) and the adjusting knob of protective resistance (R) all be installed on the shell of base (1), galvanometer (G) and switch (K) also are installed on the shell of base (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201371895U CN202485991U (en) | 2012-04-03 | 2012-04-03 | Rigid material strain test instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201371895U CN202485991U (en) | 2012-04-03 | 2012-04-03 | Rigid material strain test instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202485991U true CN202485991U (en) | 2012-10-10 |
Family
ID=46960406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201371895U Expired - Fee Related CN202485991U (en) | 2012-04-03 | 2012-04-03 | Rigid material strain test instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202485991U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103557989A (en) * | 2013-11-06 | 2014-02-05 | 济南大学 | Piezoelectric strain sensor, method for testing strain sensitivity of piezoelectric strain sensor and application of piezoelectric strain sensor |
| CN104269088A (en) * | 2014-10-25 | 2015-01-07 | 安徽工程大学 | Mechanical experimental device and method for conducting experiment by applying same |
-
2012
- 2012-04-03 CN CN2012201371895U patent/CN202485991U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103557989A (en) * | 2013-11-06 | 2014-02-05 | 济南大学 | Piezoelectric strain sensor, method for testing strain sensitivity of piezoelectric strain sensor and application of piezoelectric strain sensor |
| CN104269088A (en) * | 2014-10-25 | 2015-01-07 | 安徽工程大学 | Mechanical experimental device and method for conducting experiment by applying same |
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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: 20121010 Termination date: 20130403 |