CN2708251Y - Resistance strain transducer with self-protection function - Google Patents
Resistance strain transducer with self-protection function Download PDFInfo
- Publication number
- CN2708251Y CN2708251Y CN 200420026613 CN200420026613U CN2708251Y CN 2708251 Y CN2708251 Y CN 2708251Y CN 200420026613 CN200420026613 CN 200420026613 CN 200420026613 U CN200420026613 U CN 200420026613U CN 2708251 Y CN2708251 Y CN 2708251Y
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- self
- circuit
- resistance strain
- sensor
- elastic body
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The utility model relates to a resistance strain transducer with self-protection function, comprising an elastic body used for sensing power, pressure and twist pitch, and an electric resistance strain gauge at the elastic body slot wall is connected with a constituted Wheatstone circuit. The input loop and the output loop of the Wheatstone circuit are respectively connected with self-recovery fuse F1, F2. The input loop and the output loop through the Wheatstone bridge are both equipped with self-recovery fuses, and making use of the self-recovery fuse normal is provided with very low resistor. When the circuit is overloading, the impedance enlarges rapidly to reach the purpose of limit the circuit and prevent the resistance foil gage burning, and when the circuit is returning to normal, the self-recovery fuse also returns to the normal low resistance state. Then the sensor normally works, and the sensor reliability is increased, and the sensor lifetime is extended.
Description
Technical field
The utility model relates to a kind of strain gauge transducer, especially relates to a kind of resistance strain type sensor with self-protection function.
Background technology
Resistance strain gage has obtained widely using in various Design of Sensor manufacturings and engineering survey, and its principle of work is exactly that elongated metal foil is strained and cause the change of resistance value, the variation of measuring its strain resistor by Wheatstone bridge.Resistance strain type sensor is made of elastic body, the resistance strain gage, compensating resistance, the nickel sheet that are connected on the elastic body usually, and can be according to the quantity of the resistance strain gage that connects on the elastic body or paste to form metering circuits such as full-bridge, half-bridge, 1/4 bridge.
But because resistance strain gage is made up of very thin tinsel, its electric current that allows to pass through is very little, general only about tens milliamperes, so break down when sensor, or when being subjected to outside electromagnetic interference, lightning surge, the very big induction current that produces, in foil gauge paper tinsel silk, blow the paper tinsel silk, make resistance strain gage ineffective, and can't measure, sensor is scrapped.
For preventing the overcurrent damage sensor, be in metering circuit, to be connected to fuse at present, reach the purpose of current limliting by fuse.But the sensor of this kind structure is by the burning of fuse, and makes sensor be in off-state, and sensor is protected.But after general fuse burns, when electric current returns to normal condition, need manually to change fuse again again, fuse can't be realized automatic recovery.Therefore, be necessary fundamentally to solve the problem of resistance strain gage overcurrent protection.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of resistance strain type sensor with self-protection function; can carry out overcurrent protection to the Hui Sideng circuit that resistance strain gage constitutes by resettable fuse; and work as electric current and recover just often, sensor is resumed work automatically.
The utility model is that the technical scheme that achieves the above object is: a kind of resistance strain type sensor with self-protection function; comprise the elastic body of esthesis, pressure, torque and stick on the Hui Sideng circuit that the resistance strain gage at elastic body slotted eye hole wall place connects and composes, be connected to resettable fuse F1, F2 respectively at the input circuit and the output loop of Hui Sideng circuit.
The utility model is equipped with resettable fuse at the input circuit and the output loop of the Wheatstone bridge that is made of resistance strain gage, has very low resistance when utilizing the resettable fuse normality, its impedance increases rapidly when current overload, reach the purpose that current limliting prevents the burn-out resistance foil gauge, and work as electric current and recover just often, resettable fuse also returns to the normality low resistive state, makes normal operation of sensor, improve the reliability of sensor, prolonged the life-span of sensor.
Because sensor mostly is applied in the continuous process of production, on-the-spot environment for use can be very abominable, and on-the-spot various electromagnetic interference (EMI) can be a lot, with the strain gauge load cell is example, a large amount of steel sensor application are in industry spot, and the most cheap sensor is also wanted nearly 1,000 yuan, and quantity is huge especially.Adopt sensor of the present utility model can tackle various interference well, the protective resistance foil gauge has not only been saved the more substantial contribution of emat sensor, and has reduced the loss of the stop work and production that causes because of emat sensor more, and is significant.
Description of drawings
Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.
Fig. 1 is the synoptic diagram of structure of the present utility model.
Fig. 2 is the vertical view of Fig. 1.
Fig. 3 is the rear view of Fig. 1.
Fig. 4 is circuit theory diagrams of the present utility model.
Embodiment
The resistance strain type sensor that the utlity model has the self-protection function shown in Fig. 1～3; comprise the elastic body 1 of esthesis, pressure, torque and stick on the resistance strain gage 2 at elastic body 1 slotted eye 1-1 hole wall place; the Wheatstone bridge that resistance strain gage 2 connects and composes; see shown in Fig. 1,3,4; G1～G4 is a resistance strain gage 2, and closely sticks on composition Hui Sideng full-bridge circuit on the elastic body 1.Circuit structure for Hui Sideng half-bridge or 1/4 bridge is similar, and just the resistance strain gage 2 with G1～G4 among Fig. 4 is replaced with fixed resistance.Therefore when being subjected to distortion such as outside pressure, torque when elastic body 1, resistance strain gage 2 and elastic body 1 are out of shape simultaneously, make the resistance of resistance strain gage 2 change, and can record the changes in resistance value by Wheatstone bridge, obtain the deflection of elastic body 1.See shown in Figure 4; the utility model is connected to resettable fuse F1 at the input circuit of Hui Sideng circuit; the positive pole that resettable fuse F1 can be connected on input circuit also can be connected on negative pole; and the output loop at the Hui Sideng circuit also is connected to resettable fuse F2; the positive pole that resettable fuse F2 can be connected on output loop also can be connected on negative pole; when the excessive electric current of external interference generation surpasses the maximum current of sensor resistance foil gauge 2 permissions; then the resettable fuse F2 of the resettable fuse F1 of Hui Sideng circuit output loop or input circuit will be heated and change; the impedance of resettable fuse F1 or F2 is increased rapidly; thereby reached the purpose of current-limiting protection foil gauge; no matter therefore external interference enters from the input end or the output terminal of Hui Sideng circuit, all can comprehensively protect sensor.When operate as normal, because resettable fuse F1 and F2 are in low resistive state, resistance is stable, can not influence the sensor measurement precision.
Claims (1)
1, a kind of resistance strain type sensor with self-protection function; comprise elastic body (1) and stick on the Hui Sideng circuit that resistance strain gage (2) that elastic body (1) slotted eye hole wall (1-1) locates connects and composes, it is characterized in that: input circuit and output loop at the Hui Sideng circuit are connected to resettable fuse F1, F2 respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420026613 CN2708251Y (en) | 2004-04-27 | 2004-04-27 | Resistance strain transducer with self-protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420026613 CN2708251Y (en) | 2004-04-27 | 2004-04-27 | Resistance strain transducer with self-protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2708251Y true CN2708251Y (en) | 2005-07-06 |
Family
ID=34849484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420026613 Expired - Lifetime CN2708251Y (en) | 2004-04-27 | 2004-04-27 | Resistance strain transducer with self-protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2708251Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101273247B (en) * | 2005-07-22 | 2010-10-27 | 霍尼韦尔国际公司 | Magnetic sensor and magnetic sensing method |
| CN110132466A (en) * | 2018-12-11 | 2019-08-16 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of intelligence sensor and its working method |
-
2004
- 2004-04-27 CN CN 200420026613 patent/CN2708251Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101273247B (en) * | 2005-07-22 | 2010-10-27 | 霍尼韦尔国际公司 | Magnetic sensor and magnetic sensing method |
| CN110132466A (en) * | 2018-12-11 | 2019-08-16 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of intelligence sensor and its working method |
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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 | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140427 Granted publication date: 20050706 |