CN203551091U - Circuit solving negative shifts of output signals of multiple weighing sensors on line - Google Patents
Circuit solving negative shifts of output signals of multiple weighing sensors on line Download PDFInfo
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- CN203551091U CN203551091U CN201320629069.1U CN201320629069U CN203551091U CN 203551091 U CN203551091 U CN 203551091U CN 201320629069 U CN201320629069 U CN 201320629069U CN 203551091 U CN203551091 U CN 203551091U
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- load cells
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Abstract
This utility model discloses a simulation weighing sensor circuit solving negative shifts of output signals of multiple weighing sensors online. The simulation weighing sensor circuit comprises three bridge arms constituted respectively by a first resistor (R1), a second resistor (R2), a fourth resistor (R4) and an another arm bridge which is a Wheatstone bridge obtained through serially connecting the third resistor (R3) and a first potentiometer (W1). A second potentiometer (W2) and a sixth resistor (R6) are serially connected between a pair of nodes of the Wheatstone bridge, and another pair of nodes of the Wheatstone bridge respectively form an excitation positive terminal (EXC+) and an excitation negative terminal (EXC-). The two terminals of the sixth resistor (R6) respectively form a signal output positive terminal (SIG+) and a signal output negative terminal (SIG-). The simulation weighing sensor circuit disclosed by the utility model can solve the negative shift of the output signal of the weighing sensors on line without changing the weighing sensor, and the processing method is fast and effective which can greatly prevent impact.
Description
Technical field
The utility model belongs to field of measuring techniques, relates to the simulation LOAD CELLS circuit of many LOAD CELLS output signal negative sense drifts of a kind of online solution.
Background technology
At metallurgy industry, each production link all be unable to do without electronic scales, and electronic scales is participated in the measure of production and control directly.Generally, an electronic scales has 3 LOAD CELLS at least, 8 to 10 at most.While weighing, LOAD CELLS is converted to electric signal by the weight of weighed object, and then the input end of weighing instrument is inputted in the output signal parallel connection of each LOAD CELLS afterwards, and weighing instrument, by changing and calibrating, finally shows the weight of weighed object.Figure 1 shows that existing electronic scale weighing circuit diagram, it by some LOAD CELLS (N1, N2 ... .Nn) and weighing instrument form, each LOAD CELLS can be reduced to a resistance bridge, and each LOAD CELLS is equipped with signal output plus terminal (SIG+), signal output negative terminal (SIG-), excitation anode (EXC+) and excitation negative terminal (EXC-), and is connected with weighing instrument corresponding port respectively.In actual use, after one period of service time, based on some external cause, be weighed object LOAD CELLS is impacted as when metering, make LOAD CELLS because elastic body itself elastic deformation has occurred and can not return to virgin state, and the factor of LOAD CELLS itself is used after some cycles as LOAD CELLS, output signal was compared drift was occurred with original zero signal output zero point, cause electronic scales in use for some time, the total input signal (being the total output signal of LOAD CELLS) of its weighing instrument is compared with original total input signal, there is variation in various degree.When many LOAD CELLS generation negative senses drift about (compared with original output signal, LOAD CELLS output signal is negative value output) time, can make the total output signal of LOAD CELLS reduce, so that the total output signal of LOAD CELLS is negative sense output voltage, (the signal input range of weighing instrument is one on the occasion of scope to exceed the input reference signal of weighing instrument, input reference signal is 0 ~ 30mV), cause weighing instrument to work.
Solve problems was all to change these LOAD CELLS that negative sense drifts about occurs in the past, made total output voltage of LOAD CELLS reach virgin state scope.But, change LOAD CELLS spare part input very large, when spares reserve is not enough, plant maintenance personnel cannot solve this type of fault, after can only waiting spare part to put in place, just can fix a breakdown, the normal production of final impact.
Utility model content
One of the purpose of this utility model is the problem existing for prior art, a kind of simulation LOAD CELLS circuit that can solve online many LOAD CELLS output signal negative sense drifts is provided, by the access of this circuit, solve online LOAD CELLS output signal negative sense drift phenomenon, avoid the replacing of LOAD CELLS.
For this reason, the utility model adopts following technical scheme:
A kind of simulation LOAD CELLS circuit that can solve online many LOAD CELLS output signal negative sense drifts, it is characterized in that, comprise by the first resistance, the second resistance, three brachium pontis that the 4th resistance forms respectively and the resistance bridge being formed by the 3rd resistance and the first potentiometer another brachium pontis in series, between a pair of node of described resistance bridge, be in series with the second potentiometer and the 6th resistance, another of described resistance bridge forms respectively excitation anode and excitation negative terminal to node, the two ends of described the 6th resistance form respectively signal output plus terminal and signal output negative terminal.
Further, described the second potentiometer and the 6th resistance are also in series with the 5th resistance.
Further, the resistance of described the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance is 300 Ω, and the Standard resistance range of the first potentiometer is 0-250 Ω, and the Standard resistance range of the second potentiometer is 0-20k Ω.
Utilize foregoing circuit to solve a method for many LOAD CELLS output signal negative sense drifts, comprise the steps:
(1), under electronic scales immunization with gD DNA vaccine, the signal output plus terminal of simulation LOAD CELLS circuit, signal output negative terminal, excitation anode are connected respectively with the corresponding port of weighing instrument with excitation negative terminal;
(2) coarse adjustment: according to the negative voltage value of the total output of LOAD CELLS, regulate the first potentiometer resistance, make to simulate LOAD CELLS circuit and export a forward voltage values, offset or make total input voltage value of weighing instrument to increase to forward voltage values with the negative voltage value of LOAD CELLS output;
(3) accurate adjustment: regulate the second potentiometer resistance, make the voltage output value of simulating LOAD CELLS circuit do to change among a small circle, finally make the voltage input value of weighing instrument reach normal value.
Because the resistance of the each brachium pontis of electronic scale LOAD CELLS is generally the substitutional resistance about 300 Ω, for matching with LOAD CELLS, the utility model first to the resistance of the 6th resistance is all set as 300 Ω.The resistance that simulation LOAD CELLS circuit is used must be selected wire-wound resistor or the metalfilmresistor that temperature coefficient is little, degree of stability is high, and potentiometer must be selected the multiturn potentiometer of high stability.The effect of the 5th resistance is to guarantee circuit safety, prevents that the second potentiometer resistance from being at 0 o'clock, and it is excessive that the 6th resistance both end voltage simulates LOAD CELLS circuit output voltage, damages weighing instrument.
Circuit theory of the present utility model is as follows:
1, as shown in Figure 2, according to the principle of resistance bridge, the output voltage at simulation LOAD CELLS circuit A, B two ends:
U
ab=U
i[R2/(R1+R2)-R3/(R3+ △ W1+R4)] (formula one)
Simulation LOAD CELLS output voltage simulates load cell signal output terminal SIG+, SIG-output voltage is the 6th resistance R 6 both end voltage U
r6, and U
r6=U
sIG+SIG-=U
ab-U
r5-U
△ W2(formula two)
In above formula: U
i---the confession bridge voltage of-LOAD CELLS, i.e. weighing instrument excitation anode EXC+ and excitation negative terminal EXC-put on the supply voltage in LOAD CELLS;
U
sIG+SIG-----simulation LOAD CELLS circuit output voltage;
U
r5----five resistance R 5 both end voltage;
U
△ W2---the-the second potentiometer W2 both end voltage;
△ W1----the first potentiometer W1 resistance.
2, take 5V, supply bridge voltage as example below, further illustrate the utility model principle of work.
Adjusting the first potentiometer W1 potentiometer resistance is 1 o'clock, bridge balance, the output voltage U at simulation LOAD CELLS circuit A, B two ends
abfor 0mV, now simulate LOAD CELLS output voltage U
r6voltage is also 0mV.
When adjusting the first potentiometer W1 resistance △ W1 and being 250 Ω, by formula one, can obtain U
abfor 735mV, adjust the second potentiometer W2 resistance △ W2 and adjust to while being 10430 Ω, simulation LOAD CELLS output voltage U
r6for 20mV.Certainly, when the first potentiometer W1 resistance △ W1 is 250 Ω, adjusts the second potentiometer W2 resistance △ W2 and progressively reduce, voltage U
r6can progressively raise, but when reality is used, can not use too high output voltage, while adjusting to 10430 Ω, be output as 20mV, enough offset negative sense drift.
Adjust the first potentiometer W1 resistance at 60 Ω, when adjustment the second potentiometer W2 resistance is 16450 Ω, simulation LOAD CELLS output output voltage U
r6for 4mV.
From above potentiometer adjustment, can find out simulation LOAD CELLS output voltage U
r6can between 4 mV to 20 mV, regulate, this value range is enough to offset the negative sense output valve that the drift of LOAD CELLS negative sense produces, and can meet the use of general electronic scales.
The beneficial effects of the utility model are: can solve online the problem of LOAD CELLS negative sense drift, and without changing LOAD CELLS; Disposal route is effective fast, can farthest avoid impact to produce; Method is with low cost, easy to implement.
Accompanying drawing explanation
Fig. 1 is existing electronic scale weighing circuit theory diagrams;
Fig. 2 is the utility model simulation LOAD CELLS circuit theory diagrams;
Fig. 3 is the utility model simulation LOAD CELLS and weighing instrument access schematic diagram.
In figure, round dot indication circuit tie point.
Embodiment
As shown in Figure 2, a kind of simulation LOAD CELLS circuit that can solve online many LOAD CELLS output signal negative sense drifts, comprise by the first resistance R 1, the second resistance R 2, three brachium pontis that the 4th resistance R 4 forms respectively and the resistance bridge being formed by the 3rd resistance R 3 and the first potentiometer W1 another brachium pontis in series, between a pair of node of described resistance bridge, be in series with the 5th resistance R 5, the second potentiometer W2 and the 6th resistance R 6, another of described resistance bridge forms respectively excitation anode EXC+ and excitation negative terminal EXC-to node, the two ends of described the 6th resistance R 6 form respectively signal output plus terminal SIG+ and signal output negative terminal SIG-.
And the first resistance R 1 is 300 Ω to the 6th resistance R 6 resistances, and the Standard resistance range of the first potentiometer W1 is 0-250 Ω, and the Standard resistance range of the second potentiometer W2 is 0-20k Ω.
Take maximum, be weighed as 180t static electronic scale (using 8 50t LOAD CELLS) as example below, further illustrate and utilize foregoing circuit to solve the method for many LOAD CELLS output signal negative sense drifts.This electronic scale weighing sensor is 5V for bridge voltage, under normal immunization with gD DNA vaccine, the total output voltage values of LOAD CELLS be 3.70mV(because there being scale pan effect of weight, during without the scale pan, be 0 mV); Under multiple factors impact, there is negative sense drift in LOAD CELLS total output signal, total be specially-0.50mV of output voltage values, and solution process is as follows:
(1), under electronic scales immunization with gD DNA vaccine, as shown in Figure 3, the signal output plus terminal of simulation LOAD CELLS circuit, signal output negative terminal, excitation anode are connected respectively with the corresponding port of weighing instrument with excitation negative terminal;
(2) coarse adjustment: according to the negative voltage value of the total output of LOAD CELLS, regulating the first potentiometer W1 resistance is 60 Ω, according to formula one, can make to simulate LOAD CELLS circuit A, B two ends obtain a forward voltage 227mV, thereby make to simulate LOAD CELLS circuit and export a forward voltage values, offset with the negative voltage value of LOAD CELLS output;
(3) accurate adjustment: regulate the second potentiometer W2 resistance, make the voltage output value of simulating LOAD CELLS circuit do slightly to change, while being 15630 Ω to the second potentiometer W2 resistance, at U
sIG+SIG-two ends obtain the voltage of 4.2 mV, and the voltage input value of weighing instrument reaches normal value 4.2-0.50mV=3.70 mV.
Claims (3)
1. one kind can solve the simulation LOAD CELLS circuit of many LOAD CELLS output signal negative sense drifts online, it is characterized in that, comprise by the first resistance (R1), the second resistance (R2), three brachium pontis that the 4th resistance (R4) forms respectively and the resistance bridge being formed by the 3rd resistance (R3) and the first potentiometer (W1) another brachium pontis in series, between a pair of node of described resistance bridge, be in series with the second potentiometer (W2) and the 6th resistance (R6), another of described resistance bridge forms respectively excitation anode (EXC+) and excitation negative terminal (EXC-) to node, the two ends of described the 6th resistance (R6) form respectively signal output plus terminal (SIG+) and signal output negative terminal (SIG-).
2. a kind of simulation LOAD CELLS circuit that can solve online many LOAD CELLS output signal negative sense drifts according to claim 1, is characterized in that, described the second potentiometer (W2) and the 6th resistance (R6) are also in series with the 5th resistance (R5).
3. a kind of simulation LOAD CELLS circuit that can solve online many LOAD CELLS output signal negative sense drifts according to claim 2, it is characterized in that, the resistance of described the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5) and the 6th resistance (R6) is 300 Ω, the Standard resistance range of the first potentiometer (W1) is 0-250 Ω, and the Standard resistance range of the second potentiometer (W2) is 0-20k Ω.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320629069.1U CN203551091U (en) | 2013-10-12 | 2013-10-12 | Circuit solving negative shifts of output signals of multiple weighing sensors on line |
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| CN201320629069.1U CN203551091U (en) | 2013-10-12 | 2013-10-12 | Circuit solving negative shifts of output signals of multiple weighing sensors on line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575376A (en) * | 2013-10-12 | 2014-02-12 | 酒泉钢铁(集团)有限责任公司 | Circuit and method for solving negative-going drifting of output signals of multiple weighing sensors in on-line mode |
| CN106248190A (en) * | 2016-09-07 | 2016-12-21 | 合肥三冠包装科技有限公司 | A kind of four-head scale Weighing module and vibrations regulating circuit |
-
2013
- 2013-10-12 CN CN201320629069.1U patent/CN203551091U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575376A (en) * | 2013-10-12 | 2014-02-12 | 酒泉钢铁(集团)有限责任公司 | Circuit and method for solving negative-going drifting of output signals of multiple weighing sensors in on-line mode |
| CN103575376B (en) * | 2013-10-12 | 2017-04-05 | 酒泉钢铁(集团)有限责任公司 | A kind of circuit and method for solving many LOAD CELLS output signal negative sense drifts online |
| CN106248190A (en) * | 2016-09-07 | 2016-12-21 | 合肥三冠包装科技有限公司 | A kind of four-head scale Weighing module and vibrations regulating circuit |
| CN106248190B (en) * | 2016-09-07 | 2018-09-14 | 合肥三冠包装科技有限公司 | A kind of four-head scale Weighing module and vibrations regulating circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140416 Termination date: 20141012 |
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| EXPY | Termination of patent right or utility model |