CN202305085U - Tension sensor - Google Patents
Tension sensor Download PDFInfo
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- CN202305085U CN202305085U CN2011204497994U CN201120449799U CN202305085U CN 202305085 U CN202305085 U CN 202305085U CN 2011204497994 U CN2011204497994 U CN 2011204497994U CN 201120449799 U CN201120449799 U CN 201120449799U CN 202305085 U CN202305085 U CN 202305085U
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Abstract
The utility model discloses a tension sensor, comprising a base plate and a circuit board, wherein a strain gauge is arranged on the base plate, a signal processing circuit and a microprocessor unit are arranged on the circuit board, the strain gauge is connected with the signal processing circuit, the signal processing circuit comprises a power supply circuit, a nonlinear compensation circuit, a filtering circuit, a differential amplifier circuit and an output circuit, the power supply circuit is used for providing a power supply, the input end of the filtering circuit is connected with the output end of the strain gauge, the input end of the differential amplifier circuit is connected with the output end of the filtering circuit, the output end of the differential amplifier circuit is connected with the input end of the output circuit and the input end of the nonlinear compensation circuit respectively, and the nonlinear compensation circuit is connected with the input end of the strain gauge. According to the utility model, the whole performance is greatly promoted and the product stability is greatly improved.
Description
Technical field
The utility model relates to sensor field, particularly relate to a kind ofly be used to weave, the tension pick-up of chemical fibre industry.
Background technology
Based on traditional tension pick-up principle; Traditional sensor adopts metal strain plate as pressure-sensitive device; Form electric bridge with metal strain plate, apply driving voltage after, electric bridge converts the deformation of pressure through transmission rod to electric signal; The follow-up signal treatment circuit is exported required voltage signal or current signal after electric signal is carried out shaping amplification etc. and handles in proportion.Owing to adopt metal strain plate as pressure-sensitive device; Therefore metal strain plate need be pasted on the metal substrate with binder; Because the binder of selecting for use and the influence of barbola work; Can produce problems such as mechanical hysteresis, creep and drift, just must increase the complexity of follow-up signal treatment circuit, thereby make the globality and the bad stability of tension pick-up in order to enhance product performance.
The utility model content
The purpose of the utility model provides a kind of tension pick-up with simple signal treatment circuit, makes that the whole stability of product is improved significantly.
For solving the problems of the technologies described above, the utility model comprises substrate and wiring board, and described substrate is provided with strain bridge; Described wiring board is provided with signal processing circuit and microprocessor unit; Described strain bridge links to each other with described signal processing circuit, and described signal processing circuit comprises power circuit, non-linear compensation circuit, filtering circuit, differential amplifier circuit and output circuit; Described power circuit is used to provide power supply; The input end of described filtering circuit links to each other with the output terminal of described strain bridge; The input end of described differential amplifier circuit links to each other with the output terminal of described filtering circuit; The output terminal of described differential amplifier circuit links to each other with the input end of described output circuit and the input end of non-linear compensation circuit respectively; Described non-linear compensation circuit links to each other with the input end of described strain bridge.
As a kind of preferred version of the utility model, described signal processing circuit also comprises the zero compensation circuit; Described zero compensation circuit links to each other with described differential amplifier circuit.
As a kind of preferred version of the utility model, also be provided with temperature-compensation circuit on the described wiring board; Described temperature-compensation circuit comprises operational amplifier; The negative pole end of described operational amplifier is connected with the thermo-sensitive resistor that is integrated on the described strain bridge; Positive terminal links to each other with the output terminal of described microprocessor unit, and output terminal links to each other with the input end of described microprocessor unit.
As a kind of preferred version of the utility model, described power circuit comprises the first voltage stabilizing mu balanced circuit and second mu balanced circuit; Described first mu balanced circuit is that the operational amplifier in the described signal processing circuit provides power supply; Described second mu balanced circuit is that described microprocessor unit provides power supply.
As a kind of preferred version of the utility model, the output terminal of described output circuit is provided with holding circuit.
As a kind of preferred version of the utility model, described holding circuit is made up of voltage stabilizing diode.
As a kind of preferred version of the utility model, described filtering circuit is by three resistance and three twin-T bridge filtering circuits that electric capacity is formed.
As a kind of preferred version of the utility model, described substrate is processed by stupalith.
The technique effect of the utility model is on the overall performance of tension pick-up very big lifting has been arranged, and product stability improves greatly, because pottery can be not oxidized as metal; So can use not influencing serviceable life than rugged surroundings, can not have influence on performance of products yet, so just widened the usable range of product greatly; Conventional pressure sensor is used in same rugged environment relatively; Product extends serviceable life greatly, and stability improves greatly, has correspondingly also reduced use cost, maintenance cost, has alleviated problems such as environmental pollution; Also improve the income of the enterprise that uses this utility model, reduced social cost.
Description of drawings
Below in conjunction with accompanying drawing and preferred implementation the utility model is done further detailed explanation.
Fig. 1 is the circuit block diagram of the utility model tension pick-up.
Fig. 2 is the circuit theory diagrams of the utility model tension pick-up.
Fig. 3 is power circuit principle figure in the utility model tension pick-up.
Fig. 4 is a non-linear compensation circuit schematic diagram in the utility model tension pick-up.
Fig. 5 is zero compensation circuit theory diagrams in the utility model tension pick-up.
Fig. 6 is a filtering circuit schematic diagram in the utility model tension pick-up.
Fig. 7 is a temperature-compensation circuit schematic diagram in the utility model tension pick-up.
Fig. 8 is an output circuit schematic diagram in the utility model tension pick-up.
Embodiment
As shown in Figure 1, the tension pick-up of the utility model comprises substrate and wiring board, and described substrate is provided with strain bridge; Described wiring board is provided with signal processing circuit and microprocessor unit; Described strain bridge links to each other with described signal processing circuit, and described signal processing circuit comprises power circuit, non-linear compensation circuit, filtering circuit, differential amplifier circuit and output circuit; Described power circuit is used to provide power supply; The input end of described filtering circuit links to each other with the output terminal of described strain bridge; The input end of described differential amplifier circuit links to each other with the output terminal of described filtering circuit; The output terminal of described differential amplifier circuit links to each other with the input end of described output circuit and the input end of non-linear compensation circuit respectively; Described non-linear compensation circuit links to each other with the input end of described strain bridge.Described signal processing circuit also comprises the zero compensation circuit; Described zero compensation circuit links to each other with described differential amplifier circuit.Also be provided with temperature-compensation circuit on the described wiring board; Described temperature-compensation circuit comprises operational amplifier; The negative pole end of described operational amplifier is connected with the thermo-sensitive resistor that is integrated on the described strain bridge; Positive terminal links to each other with the output terminal of described microprocessor unit, and output terminal links to each other with the input end of described microprocessor unit.The circuit theory diagrams of the utility model are as shown in Figure 2.
The utility model partly is made up of the ceramic substrate of strain bridge, ceramic cushion block, wiring board, lead-in wire and screw etc. aluminium alloy base, aluminium alloy loam cake, ceramic yarn guiding wheel, pottery transmission bar, sintering.Wherein, ceramic yarn guiding wheel transmits bar with pottery, all adopts improved process, and economy-combat grinding and polishing light forms, and the surface does not almost have defectives such as trachoma, has improved the probability that is worn of spun yarn greatly.
As shown in Figure 3, the input voltage of described power circuit is 19 ~ 29VDC, and input current comprises the first voltage stabilizing mu balanced circuit and second mu balanced circuit greater than 20mA.Described first mu balanced circuit is made up of transistor T 1, diode D1 and resistance R 2, and for the operational amplifier in the described signal processing circuit provides power supply, its output voltage is 16.9 ~ 17.4VDC, and wherein, diode D1 plays reverse polarity protection's effect.Described second mu balanced circuit is fixed voltage three terminal integrated voltage stabilizer 78L05A, and for described microprocessor unit provides power supply, its output voltage is 5V ± 0.2VDC.Can know that from figure start current-limiting resistance R1 is 47 Ω, maximum current Ipp=(29-0.7)/47=0.6A so, less than rated current 1A, the pressure drop during operate as normal then is 0.7V.
The utility model core is that output level becomes good linear relationship with tension force.The strain bridge of test tension force is owing to receive a variety of causes (technology; The stress point position; Material or the like) influence; Its output is not desirable linear relationship with tension force, and particularly the output of strain bridge can reduce when tension force becomes big, the linear relationship that therefore needs non-linear compensation circuit that the output and the tension force of strain bridge are corrected function in direct ratio.The principle of non-linear compensation circuit is as shown in Figure 4, from figure, can know:
In following formula, driving voltage Uo is high more, and strain bridge is under identical deformation; The voltage that produces is just high more, and output is also just big more, by above formula; After providing constant voltage U A, Uo just is directly proportional with UB, that is to say that UB is big more; Uo is also just big more, and is when promptly the output voltage of strain bridge is big more, just big more to the just compensation of driving voltage Uo; So just in time compensate the defective that after-stage slope that strain bridge increases at tension force reduces, thereby reached the purpose that the output of final strain bridge is directly proportional with tension force.Can know through following formula, can change slope of a curve, adjust the degree of linear compensation, do suitable adjustment according to differently strained electric bridge through adjustment resistance R 32 or R31 through adjustment resistance R 34, can not over-compensation can not undercompensation.Obtain following parameter: R33=82K through overtesting, R34=75K (adjustable), R31=100K, R32=300K.
Shown in Figure 5 is the zero compensation circuit theory diagrams, from figure, can know:
If with R26=R29, R27=R30 can be reduced to following formula as follows when parameter was set:
It is thus clear that adjustment US value can be adjusted the starting point magnitude of voltage, and can not influence slope, so just can be through the resistance R 13 in the adjustment zero compensation circuit, R14, the value of R15 and R16 is adjusted the value of US, and then adjustment starting point voltage.If with starting point voltage be made as 0.1V (± 0.1V), obtain following parameter: R13=200K (adjustable), R14=470K, R15=100K, R16=39K through test.
Filtering circuit is as shown in Figure 6, and this filtering circuit is by three resistance R 35, R36; R37 and three capacitor C 19, C20, the symmetrical twin-T bridge filtering circuit that C21 forms; The characteristics of symmetry twin-T bridge filtering circuit are R36=R37=R; R35=R/2n, C20=C21=C, C19=2C/n; Here get n=1; Its center resonant frequency is:
, can calculate f0=4.5KHz according to the parameter among the figure, the noise signal that some mechanical vibration of filtering like this cause.
Shown in Figure 7 is temperature-compensation circuit, and this temperature-compensation circuit comprises operational amplifier, and the negative pole end of described operational amplifier is connected with the thermo-sensitive resistor that is integrated on the described strain bridge.From figure, can know; The signal that microprocessor unit sends a series of different frequencies passes through the positive terminal generation continually varying level of the filtering of resistance R 9, R10 and capacitor C 9, C10 at operational amplifier IC2; When this level during greater than the level of negative pole end; Output terminal will be exported high level and give microprocessor unit, and microprocessor unit is through relatively calculating corresponding temperature compensation value, and the driving voltage through the controlling strain electric bridge compensates.The negative pole end of operational amplifier IC2 links to each other with the thermistor RE that is integrated in strain bridge, so thermistor RE is when detecting the strain bridge temperature and changing, and the voltage of the negative pole end of operational amplifier IC2 also can change.
Shown in Figure 8 is output circuit; The output terminal of this output circuit is provided with holding circuit; This holding circuit is made up of voltage stabilizing diode D3, because voltage stabilizing diode D3 plays the effect of restriction output voltage, thereby has prevented to make because of overtension the situation of external unit damage.The * Vin=2.2Vin of the output voltage V of this output circuit OUTPUT end=(1+R7/R8), the scope 0-1.14V of Vin.Because the open-loop output impedance of general operational amplifier is all very little; Therefore the output impedance that is under the close loop negative feedback state is then littler; Can ignore; Therefore the output impedance in this circuit just can be calculated as (R5+R6)/(R7+R8), and R5 and R6 are much larger than R7 and R8, so total output impedance of this circuit is (R5+R6).
The utility model adopts pottery (principal ingredient AL
2O
3) make substrate; With the metal pressure sensitive with high temperature direct sintering more than 850 ℃ on substrate because the peculiar advantage of stupalith, mechanical hysteresis property, creep etc. has been had great improvement; So also simplify signal processing circuit, improved the whole stability of product greatly.
The preferred embodiment of below the utility model having been created specifies; But the utility model is created and to be not limited to said embodiment, and those of ordinary skill in the art also can make all modification that is equal to or replacement all is included in the application's claim institute restricted portion under the prerequisite of the invention spirit.
Claims (8)
1. a tension pick-up comprises substrate and wiring board, and described substrate is provided with strain bridge; Described wiring board is provided with signal processing circuit and microprocessor unit; Described strain bridge links to each other with described signal processing circuit, it is characterized in that, described signal processing circuit comprises power circuit, non-linear compensation circuit, filtering circuit, differential amplifier circuit and output circuit; Described power circuit is used to provide power supply; The input end of described filtering circuit links to each other with the output terminal of described strain bridge; The input end of described differential amplifier circuit links to each other with the output terminal of described filtering circuit; The output terminal of described differential amplifier circuit links to each other with the input end of described output circuit and the input end of non-linear compensation circuit respectively; Described non-linear compensation circuit links to each other with the input end of described strain bridge.
2. tension pick-up as claimed in claim 1 is characterized in that described signal processing circuit also comprises the zero compensation circuit; Described zero compensation circuit links to each other with described differential amplifier circuit.
3. tension pick-up as claimed in claim 1 is characterized in that, also is provided with temperature-compensation circuit on the described wiring board; Described temperature-compensation circuit comprises operational amplifier; The negative pole end of described operational amplifier is connected with the thermo-sensitive resistor that is integrated on the described strain bridge; Positive terminal links to each other with the output terminal of described microprocessor unit, and output terminal links to each other with the input end of described microprocessor unit.
4. tension pick-up as claimed in claim 1 is characterized in that, described power circuit comprises the first voltage stabilizing mu balanced circuit and second mu balanced circuit; Described first mu balanced circuit is that the operational amplifier in the described signal processing circuit provides power supply; Described second mu balanced circuit is that described microprocessor unit provides power supply.
5. tension pick-up as claimed in claim 1 is characterized in that the output terminal of described output circuit is provided with holding circuit.
6. tension pick-up as claimed in claim 5 is characterized in that described holding circuit is made up of voltage stabilizing diode.
7. tension pick-up as claimed in claim 1 is characterized in that, described filtering circuit is by three resistance and three twin-T bridge filtering circuits that electric capacity is formed.
8. like the described tension pick-up of arbitrary claim in the claim 1 to 7, it is characterized in that described substrate is processed by stupalith.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204497994U CN202305085U (en) | 2011-11-14 | 2011-11-14 | Tension sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204497994U CN202305085U (en) | 2011-11-14 | 2011-11-14 | Tension sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202305085U true CN202305085U (en) | 2012-07-04 |
Family
ID=46373958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204497994U Expired - Fee Related CN202305085U (en) | 2011-11-14 | 2011-11-14 | Tension sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202305085U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852002A (en) * | 2014-03-03 | 2014-06-11 | 陈维林 | Portable low-power-consumption static resistance strain indicator |
| CN107651521A (en) * | 2017-10-13 | 2018-02-02 | 中国矿业大学 | A kind of mine hoisting system health status monitoring method based on the strain of main shaft measuring point |
| CN117147022A (en) * | 2023-10-31 | 2023-12-01 | 深圳市力准传感技术有限公司 | Force sensor nonlinear compensation method and system |
-
2011
- 2011-11-14 CN CN2011204497994U patent/CN202305085U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852002A (en) * | 2014-03-03 | 2014-06-11 | 陈维林 | Portable low-power-consumption static resistance strain indicator |
| CN107651521A (en) * | 2017-10-13 | 2018-02-02 | 中国矿业大学 | A kind of mine hoisting system health status monitoring method based on the strain of main shaft measuring point |
| CN107651521B (en) * | 2017-10-13 | 2019-04-05 | 中国矿业大学 | A kind of mine hoisting system health status monitoring method based on the strain of main shaft measuring point |
| CN117147022A (en) * | 2023-10-31 | 2023-12-01 | 深圳市力准传感技术有限公司 | Force sensor nonlinear compensation method and system |
| CN117147022B (en) * | 2023-10-31 | 2024-01-16 | 深圳市力准传感技术有限公司 | Force sensor nonlinear compensation method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20201114 |