CN103837221A

CN103837221A - Electronic scale technology capable of achieving accurate metering without weight calibration

Info

Publication number: CN103837221A
Application number: CN201310340878.5A
Authority: CN
Inventors: 张克芝; 张清源; 刘洪军
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-08-07
Filing date: 2013-08-07
Publication date: 2014-06-04

Abstract

The invention discloses an electronic scale technology capable of achieving accurate metering without weight calibration. As is shown in the figure 1, all resistance strain type simulation weighing sensors constituting a scale are connected to first-level weighing instruments or weighing channels with the four-wire system connection method, electronic calibration is conducted by the first-level weighing scales or the weighing channels in advance, and the standard weight value of each weighing sensor can be obtained by setting the measuring range, the sensitivity, the decimal point, the division value and the bridge voltage of the corresponding first-level weighing scale or weighing channel; all weighting values are transmitted to a second-level weighing digital controller through RS485 communication to enable the sum of all the weighing values to be achieved, so that the accurate overall weight of the scale is obtained, and control, analogue output and serial communication output are conducted. According to the electronic scale technology capable of achieving accurate metering without weight calibration, the accurate metering accuracy of the electronic scale can be obtained without the need of weight calibration.

Description

A kind of without the just electronic scales technology of energy accurate-metering of counterweight demarcation

One, technical field: the present invention relates to electronic scales demarcation, collimation technique field.

Two, background technology:

Electronic scale sensor connected mode in the past, normally multiple resistance-strain type analog sensors are input to weighing instrument amplifies after by parallel circuit superposed signal, A/D conversion, calculation process, demonstration, control and output, the calibration of this electronic scales will be demarcated just and can be completed by counterweight, even if the calibration of digital and electronic truck scale is also carried out unbalance loading debugging with counterweight at present, carry out zero point and range designation.

The process of carrying counterweight in the scale mode of this school has increased labour intensity and labour cost, has reduced labour productivity.Especially large-tonnage electronic scales school scale cost payout can be larger, and the precision of electronic scales is not optimal, and therefore the technology of the present invention is exactly will thoroughly solve without counterweight to demarcate and realize the collimation technique problem of high-precision electronic scale.

Three, summary of the invention:

Technical scheme of the present invention is: this technical products forms, as shown in Figure 1: point four parts: (1) scale body; (2) multiple resistance-strain type simulation LOAD CELLS of composition one platform balance; (3) first order weighing instrument or the passage of weighing; (4) second level digitial controller of weighing.

Its connected mode and principle: first weighing instrument or the passage of weighing by a first order of four-wire system connection separate connection by each simulation LOAD CELLS, this weighing instrument or the passage of weighing carry out Electronic Calibration in advance, by the range, sensitivity of sensor is set, for after bridge voltage, radix point, scale division value, first order weighing instrument or the passage of weighing can obtain the accurate weight of single-sensor.The digitial controller of weighing that the more accurate weight of all the sensors is transferred to the second level by the weighing instrument of the first order or the passage of weighing with RS485 bussing technique carries out summation operation, thereby obtains the total accurate weight of a platform balance.

Because a sensor connects a weighing instrument or the passage of weighing, the weighing instrument of this mode or passage, through Electronic Calibration, are easy to by setup parameter, realize the accurate weight of this sensor.Owing to adopting RS485 mechanics of communication, accurately Ba Ge road sensor load capacity is delivered to the second level digitial controller of weighing and carries out summation operation, thereby obtain the general assembly (TW) of a platform balance, even if the electronic scales precision of composition is without calibration of weight like this, also can be better than the precision of general electronic scales calibration of weight.

At the digitial controller of weighing of the second level, except can accurately showing the general assembly (TW) of a platform balance, can also show respectively the weight of each sensor passage, there is Protection Counter Functions, manual calibrating function and automatic Calibration function, also there are serial ports output, the printouts etc. such as switching value output, analog output and RS485 simultaneously and meet various Engineering Control needs.

Apply above principle for digital and electronic truck scale, on end instrument by passage corresponding to each digital sensor carried out to Electronic Calibration, range, sensitivity, radix point, scale division value, the confession bridge voltage of setting respectively each sensor obtain the accurate weight of single-sensor, computing summation obtains the accurate weight that truck scale is total again, carries or angular difference can reach III level scale index without counterweight tuningout.

If the sensor of composition one platform balance only has one, as hang hook steelyard, dynamometer etc., so only just can realize without counterweight and demarcate and set and calibrate by weighing instrument of the first order.

The upgrade version of this technology is that first order weighing instrument circuit is integrated on a wiring board, be divided into some passages, each passage and the second level digitial controller of weighing carries out communication, on the basis of Electronic Calibration, each passage is carried out to parameter setting and obtain accurate weight, and then carry out numeral summation and obtain total accurate weight.The second level digitial controller of weighing has setting parameter function, has manual demarcation, automatic Calibration and various output function.

Conclusion: due to the precision of first order weighing instrument or passage, generally be better than 0.01%, the precision of sensor is generally better than 0.05%, a sensor connects a weighing instrument or passage by four-wire system connection, this instrument or passage pass through Electronic Calibration, the line parameter of going forward side by side is set can obtain the weight of proximity transducer with class precision, carry out communication by RS485 again, weigh digitial controller to the each road of a platform balance weight numeral summation by the second level, thereby obtain the general assembly (TW) of this scale, therefore system accuracy can reach III level scale standard.

The advantage of the technology of the present invention: compared with existing product technology, this described technological merit: the first, remove heavy work and the cost payout that electronic scales counterweight is demarcated from.The second, the precision of the electronic scales of this technology composition is better than the electronic scales building form of in the past demarcating with counterweight, has improved system accuracy.Three, can be more than 1000m by RS485 communication transmission distance, this group of scale technology improved system stability.Four, this group of scale mode is applicable to the sensor of identical range, and the sensor that is also applicable to different ranges appears in an electronic scales simultaneously, and carries without tuningout, has just obtained accurate weight by Electronic Calibration and setting parameter.Five, Electronic Calibration and setting parameter convenient, be convenient to realize.Six, can show respectively the weight of each sensor, differentiate each road sensor quality.

The technology of the present invention has been filled up without the just blank of energy calibrated electronic scale of counterweight, and has improved the precision of electronic scales, has broken the record that different range sensorses can not form same electronic scales.

The technology of the present invention is applicable to electronic platform scale, electronic hopper scale, the extraordinary scale of electronics, electronic vehicle weighing apparatus, electronic hanger scale, electronic price computing scale, electronic ground scale, electronic still track scale, electronics overhead crane scale etc. only group scale and the calibrate of weight signal electronic scales.

Four, embodiment:

Oneself is successfully applied to this technology in the middle of exploitation.For example: for a bunker scale being formed by 3 LOAD CELLS, 2 tons of each transducer ranges, sensor is received on first order weighing instrument by four-wire system connection, this instrument model is fixed tentatively as HXTZ-ADFD-03, dispatch from the factory and do Electronic Calibration, input 18MV, corresponding output 10000 calibration, for bridge voltage 9V, transducer sensitivity 2mv/v, in instrument, establish one of radix point, scale division value is 2, range is 2000.0, setting completed directly shows accurate weight corresponding to each sensor, precision is: with the same class precision of sensor accuracy, set respectively the weighing instrument that each sensor is corresponding, thereby obtain accurate weight, again by the second level digitial controller summation operation of weighing, this instrument model is fixed tentatively as HXTZ6502, sensor accuracy is for being better than 0.05%, the system accuracy of last this platform balance is III level scale precision.

Five, brief description of the drawings:

As Fig. 1: point four parts, Part I: weighting platform; Part II: multichannel LOAD CELLS; Part III: multichannel weighing instrument or passage; Part IV: the digitial controller of weighing.Between Part II and Part III, cue is simulating signal, is RS485 communication between Part III and Part IV.

Claims

Without counterweight demarcate just can accurate-metering an electronic scales technology, the present invention is applicable to very only made the electronic scales of detecting element by a kind of resistance-strain type simulation LOAD CELLS, electronic scales forms and comprises (1) scale body, (2) multiple resistance strain weighing transducers of an electronic scales of composition, (3) first order weighing instrument or the passage of weighing, (4) second level digitial controller of weighing, it is characterized in that first each sensor four-wire system connection of the multiple resistance strain weighing transducers that form a platform balance being connect respectively to a weighing instrument or the passage of weighing (the title first order), in advance each weighing instrument of the first order or the passage of weighing are done to Electronic Calibration, when connecting the range by setting sensor after sensor, sensitivity, for bridge voltage, radix point, scale division value just can obtain accurate weight and show, each weighing instrument or the passage of weighing have RS485 serial communication function, by RS485 bussing technique, accurate gravimetric value corresponding all the sensors is delivered to the second level digitial controller of weighing and carries out summation operation, thereby obtain the accurate weight of a platform balance, whole debug process does not need counterweight to demarcate.
2. as claimed in claim 1 a kind of without the just electronic scales technology of energy accurate-metering of counterweight demarcation, it is characterized in that the each resistance-strain type simulation LOAD CELLS that forms a platform balance first to connect respectively a weighing instrument or the passage of weighing, and each weighing instrument of the first order or the passage of weighing have done Electronic Calibration in advance, carefully connect the wire power on after to the each weighing instrument of the first order or the passage of weighing only by setting the range of this sensor, sensitivity, for bridge voltage, scale division value, radix point, first order weighing instrument or the passage of weighing can accurately show this sensor weight numerical value, the accuracy of this weight numerical value can reach the accuracy class of LOAD CELLS.
3. as claimed in claim 1 a kind of without the just electronic scales technology of energy accurate-metering of counterweight demarcation, it is characterized in that first order weighing instrument or the passage of weighing have RS485 communication function, weight numerical value corresponding each sensor accurately can be delivered to respectively to the second level digitial controller of weighing, by this digitial controller of weighing, multiple weight numerical value is carried out to digital summation operation, thereby obtain the accurate weight of a platform balance.
4. as claimed in claim 1 a kind of without the just electronic scales technology of energy accurate-metering of counterweight demarcation, it is characterized in that first order weighing instrument or the passage of weighing have manual setting Electronic Calibration and automatic Calibration function, its accuracy of instrument is better than 0.01%, and there is RS485 communication function, this instrument or path setting software, make instrument or passage after Electronic Calibration, only need setting sensor range, just can accurately show weight numerical value for bridge voltage, sensitivity, scale division value, radix point.
5. as claimed in claim 1 a kind of without the just electronic scales technology of energy accurate-metering of counterweight demarcation, it is characterized in that the second level weighs digitial controller except having computing summation function, also there is the optional output function of switching value output function, simulating signal 4-20ma or 0-10V or 0-20ma, there is the communication functions such as RS485, also there is Protection Counter Functions, manual and automatic coefficient adjustment optional function.
6. as claimed in claim 1 a kind of without the just electronic scales technology of energy accurate-metering of counterweight demarcation, it is characterized in that demarcating without counterweight, without any unbalance loading impact, also poor without counterweight angle modulation, be applicable to the electronic scales being formed by the resistance-strain type analog sensor of identical range or different ranges.If the precision of all resistance strain weighing transducers of this platform balance is all better than 0.08%, the system accuracy of this platform balance can reach III level scale precision in the situation that scale structure is reasonable in design.
As claimed in claim 1 a kind of without counterweight demarcate just can accurate-metering electronic scales technology, it is characterized in that if this platform balance only has a sensor, only can realize without counterweight and demarcating by a weighing instrument of the first order, and the effect of accurate-metering.
8. as claimed in claim 1 a kind of without the just electronic scales technology of energy accurate-metering of counterweight demarcation, it is characterized in that also can demarcating by passage corresponding to each digital sensor carried out to Electronic Calibration without counterweight for digital truck scale, by setting each transducer range, sensitivity, obtaining accurate weight for bridge voltage, scale division value, radix point, then the accurate weight of each passage is obtained to general assembly (TW) as summation operation.
9. as claimed in claim 1 a kind of without the just electronic scales technology of energy accurate-metering of counterweight demarcation, it is characterized in that doing upgrading products, that the circuit of first order weighing instrument is integrated on a wiring board, be divided into several passages, digitial controller is weighed by serial communications such as RS485 in each passage and the second level, on the basis of each channel electron calibration to each passage respectively setup parameter obtain the accurate weight of single passage, then carry out numeral summation acquisition general assembly (TW).
10. as claimed in claim 1 a kind of without the just electronic scales technology of energy accurate-metering of counterweight demarcation, it is characterized in that this technology has versatility, being applicable to the extraordinary scale of electronic platform scale, electronic hopper scale, electronics, electronic vehicle weighing apparatus, electronic hanger scale, electronic price computing scale, electronic ground scale, electronic still track scale, electronics overhead crane scale etc. only has the group scale of weight signal electronic scales and calibrate (for belted electronic balance because have weight signal and inapplicable this technology of rate signal).