CN105588631A - Fault detection equipment, method and system for metering scale and engineering machinery - Google Patents

Abstract

The invention discloses a fault detection device, method and system for a metering scale and engineering machinery. The apparatus comprises: the weighing sensor is used for outputting a weight sensing signal; the signal processing device is used for detecting whether the weighing sensor has a fault or not according to the weight sensing signal; wherein the weight sensing signal is sent to the signal processing device through an independent channel. The invention can realize the real-time detection of the faults of the weighing sensors in the weighing scale, can accurately position the specific fault sensor position, and makes up the defect that the conventional electronic weighing apparatus cannot judge the faults of the sensors, thereby reducing the difficulty of fault elimination and maintenance of the weighing scale and improving the efficiency of fault treatment.

Description

Weigher fault test set, method, system and engineering machinery

Technical field

The present invention relates to metering field, particularly, relate to a kind of weigher fault test set, method,System and engineering machinery.

Background technology

The engineering machinery of for example mixing plant needs weighing-appliance, for example weigher conventionally. The one-tenth of weigherBody generally has some LOAD CELLSs, and the analog signal of LOAD CELLS output is through sensor wiringBox carries out the total weighing analog signal of rear output in parallel, thereby then amplifies and A/D conversion generation through signalThe controllers such as data signal input PLC, thus metering process completed. Embodiment as an alternative,Can omit terminal box and directly the analog signal of LOAD CELLS output be carried out to parallel connection.

Due to the analog signal parallel connection of in prior art, LOAD CELLS being exported, therefore controller can only be locatedSignal after reason parallel connection, even the in the situation that of some LOAD CELLS cisco unity malfunction, also can exportTotal voltage signal after parallel connection, causes judging LOAD CELLS abnormal, makes to measure result and is forbiddenReally, have a strong impact on the accuracy of concrete batching, cause finished product concrete quality accident.

In addition, even if rule of thumb judging LOAD CELLS, field personnel occurs extremely, also cannotProcess framework by existing weigher signal and locate the abnormal LOAD CELLS of generation, need on-the-spot workThe personnel that do investigate seriatim, have increased difficulty and the cost of overhaul of the equipments or later maintenance.

Summary of the invention

The object of this invention is to provide a kind of weigher fault test set, method, system and engineering machinery,Accurately to locate the LOAD CELLS breaking down.

To achieve these goals, the invention provides a kind of weigher fault test set, this equipment comprises:LOAD CELLS, for output weight induced signal; Signal processing apparatus, for believing according to weight inductionNumber detect described LOAD CELLS and whether break down; Wherein said weight induction signal is by independently logicalRoad is sent to signal processing apparatus.

The invention provides a kind of weigher fault detection method, the method comprises: sense weight, and defeatedGo out weight induction signal; Whether break down according to LOAD CELLS described in weight induction signal detection; ItsDescribed in weight induction signal send by passage independently.

The invention provides a kind of weigher fault detection system, this system comprises described weigher faultCheckout equipment; This system also comprises: amplifier, for amplifying weight induction signal; Analog-digital converter,For the weight induction signal after amplifying is carried out to analog-to-digital conversion.

The invention provides a kind of engineering machinery, this project machinery comprises described weigher fault detect systemSystem.

The present invention can realize the fault of LOAD CELLS in weigher and detect in real time, and can locate accuratelyTo concrete fault sensor position, make up existing electronic scale and cannot judge sensor fault notFoot, thus the difficulty that weigher fault is got rid of and safeguarded can be reduced, improve the efficiency of troubleshooting.

Other features and advantages of the present invention are described in detail the detailed description of the invention part subsequently.

Brief description of the drawings

Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for description, withDetailed description of the invention one is below used from explanation the present invention, but is not construed as limiting the invention. ?In accompanying drawing:

Fig. 1 is weigher fault test set schematic diagram provided by the invention;

Fig. 2 is weigher fault detection method flow chart provided by the invention;

Fig. 3 is weigher fault detection system schematic diagram provided by the invention.

Description of reference numerals

100 LOAD CELLS 200 signal processing apparatus

300 amplifier 400A/D converters

Detailed description of the invention

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated. Should be understood that,Detailed description of the invention described herein only, for description and interpretation the present invention, is not limited to thisBright.

In order to overcome defect of the prior art, accurately find and locate the LOAD CELLS of fault, thisThe bright weigher fault test set as shown in Figure 1 that provides. This weigher fault test set comprises:LOAD CELLS 100, for output weight induced signal; Signal processing apparatus 200, for according to heavyWhether amount induced signal detects described LOAD CELLS and breaks down; Wherein said weight induction signal passes throughIndependently passage is sent to signal processing apparatus. As described in the background section, in prior art due to willA total induced signal is exported in LOAD CELLS parallel connection afterwards, thereby causes judging that weigher whether canEnough normal work, more can not locate the LOAD CELLS 100 breaking down. In the present invention, in order to overcomeDefect of the prior art, by independently passage is independent by the induced signal of each LOAD CELLS 100Be sent to signal processing unit, thereby can utilize the linear relationship between different LOAD CELLSs 100Judge whether LOAD CELLS 100 breaks down, and locate the LOAD CELLS 100 breaking down.

In order to judge whether to break down by the linear relationship between LOAD CELLS 100, need pre-First know the linear relationship in the time that the LOAD CELLS of weigher does not have fault. The linear relationship of knowing in advanceCan obtain in definite weigher fault-free and calibration commodity of for example newly having bought or with known under prerequisiteThe object (for example counterweight) of weight is placed on weigher confirms weigher fault-free, then can be by heavyThing is placed on weigher, for example counterweight identical several weight is placed on weigher equably, butEnsure to be placed on the specified weighing value that weight F on weigher is no more than weigher. Now can record eachLinear relationship between individual LOAD CELLS. For example, the quantity of weigher is n, can have C_n2 linesSexual intercourse, for exampleWherein i ≠ j, i=1,2 ..., n, j=1,2 ..., n, D_2i、D_2jBe respectively and addThe weight induction signal of i and j LOAD CELLS output while carrying the weight of known weight. WeightInduced signal can be electric current or voltage analog signal, also can be by electric current or voltage analog signal according toThe data signal that certain conversion proportion relationship conversion is.

The weight of unknown weight being placed on while weighing on weigher, can obtain current each LOAD CELLSLinear relationship between 100, is designated asWherein i ≠ j, i=1,2 ..., n, j=1,2 ..., n, D_3i、D_3jBe respectively the weight induction letter of weight i and j the LOAD CELLS output that loads unknown weightNumber.

After the linear relationship obtaining between current each LOAD CELLS, can calculate line by following formulaThe variable quantity of sexual intercourse:

Wherein i ≠ j, i=1,2 ..., n, j=1,2 ..., n, n is LOAD CELLSQuantity,Be between i LOAD CELLS output signal and j LOAD CELLS output signalThe linear relationship of knowing,Be i LOAD CELLS output signal and j LOAD CELLS output letterCurrent linear relationship between number.

If Δ_ijBe more than or equal to threshold value, signal processing apparatus can be judged the weight of LOAD CELLS outputBetween amount induced signal, current linear relationship changes with respect to known linear relationship.

Further, at Δ_ijIn the set of composition, Δ_ijValue be equal to Δ_jiValue, there is identical iOr at least two elements in the subset of j are greater than in the situation of threshold value, i LOAD CELLS orJ LOAD CELLS breaks down, or removes i in the LOAD CELLS relevant with these at least two elementsLOAD CELLS outside individual LOAD CELLS or j LOAD CELLS all breaks down.

Have 3 LOAD CELLSs taking weigher below and describe as example, three LOAD CELLSs respectivelyBe the first LOAD CELLS, the second LOAD CELLS and the 3rd LOAD CELLS.

The in the situation that of not adding loads on weigher, record each weighing and sensing under the empty scale state of weigherThe weight induction signal D of device₁₁、D₁₂And D₁₃; On weigher body, loading gross weight is some counterweights of F,Record each weight induction signal D₂₁、D₂₂And D₂₃. Preferably, F is evenly distributed on weigher.Preferably, F is 80% of the specified variable of weigher. The object of unknown weight is loaded on weigherAfter, the weight induction signal of each LOAD CELLS is D₃₁、D₃₂And D₃₃. Calculate linearity by following formulaThe variable quantity of relation:

${\mathrm{\Δ}}_{12}=\left|\frac{\frac{D_{31}}{D_{32}}-\frac{D_{21}}{D_{22}}}{\frac{D_{21}}{D_{22}}}\right|,{\mathrm{\Δ}}_{23}=\left|\frac{\frac{D_{32}}{D_{33}}-\frac{D_{22}}{D_{23}}}{\frac{D_{22}}{D_{23}}}\right|,{\mathrm{\Δ}}_{13}=\left|\frac{\frac{D_{31}}{D_{33}}-\frac{D_{21}}{D_{23}}}{\frac{D_{21}}{D_{23}}}\right|.$

At Δ₁₂>=ε or Δ₂₃>=ε or Δ₁₃In the situation of >=ε, signal processing apparatus can judge scale bodyThere is variation in the linearity of sensor, signal processing apparatus can stop metering or production procedure,And report to the police by alarm lamp or man-machine interface. Wherein ε is the threshold value of setting.

Further, signal processing apparatus can be located fault in the following manner:

If Δ₁₂>=ε and Δ₂₃>=ε, can judge that variation has occurred the linearity of the second LOAD CELLS, orThere is variation in the linearity of the first LOAD CELLS and the 3rd LOAD CELLS simultaneously;

If Δ₂₃>=ε and Δ₁₃>=ε, can judge that variation has occurred the linearity of the 3rd LOAD CELLS, orThere is variation in the linearity of the first LOAD CELLS and the second LOAD CELLS simultaneously;

If Δ₁₂>=ε and Δ₁₃>=ε, can judge that variation has occurred the linearity of the first LOAD CELLS, orThere is variation in the linearity of the second LOAD CELLS and the 3rd LOAD CELLS simultaneously.

In addition, signal processing apparatus can obtain by following formula the weight W of the object of current loading:

$W=F\·\frac{\underset{i=1}{\overset{3}{\mathrm{\Σ}}}{D}_{3i}-\underset{i=1}{\overset{3}{\mathrm{\Σ}}}{D}_{1i}}{\underset{i=1}{\overset{3}{\mathrm{\Σ}}}{D}_{2i}-\underset{i=1}{\overset{3}{\mathrm{\Σ}}}{D}_{1i}}.$

Although above formula is in the situation for 3 LOAD CELLSs, scale obtains the formula of weight of object,This formula can be generalized to the situation of n LOAD CELLS.

For thering is the weigher of n LOAD CELLS, can obtain current note by following formulaThe weight of object carrying:

$W=F\·\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{D}_{3i}-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{D}_{1i}}{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{D}_{2i}-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{D}_{1i}};$

Wherein D_1iThe weight induction signal of i LOAD CELLS while not adding loads for weigher, D_2iForThe weight induction signal of i LOAD CELLS when weigher loaded weight F, D_3iAdd for weigher is currentThe weight induction signal of i LOAD CELLS when loads, W is the current weight that adds loads.

Correspondingly, the invention provides a kind of weigher fault detection method, the method comprises: detect heavyAmount, and output weight induced signal; Whether occur according to LOAD CELLS described in weight induction signal detectionFault; Wherein said weight induction signal is by independently passage transmission. In order to describe the method in detail,Fig. 2 shows weigher fault detection method flow chart of the present invention. From this flow chart can, detectAfter beginning, first detect the weight of object, then according to the linear relationship between each sensor andThe linear relationship of knowing compares, and judges whether linear relationship variation has occurred. If linear relationship occursVariation, can judge LOAD CELLS fault, if linear relationship does not change, the biography of weighingSensor is normal.

Correspondingly, the invention provides a kind of weigher fault detection system, this system comprises weighing and sensingDevice 100, amplifier 300, A/D converter 400 and signal processing apparatus 200. As previously mentioned,In the present invention, the signal demand of LOAD CELLS (is for example sent to signal processing apparatus by passage independentlyMicrocontroller, digital signal processing chip etc.), can arrange one solely for each LOAD CELLSVertical passage, the i.e. respectively corresponding amplifier of each LOAD CELLS and an analog-digital converter. Can replaceChange ground, can pass through the mode of poll successively by the weight induction signals collecting of weighing sensor out, andSend to shared amplifier and analog-digital converter, process mould thereby weight induction signal is sent to signalPiece. Except the above-mentioned mode that realizes autonomous channel, also have other implementation, no longer superfluous at thisState. Those skilled in the art can understand amplifier can be for amplifying weight induction signal, and A/D turnsParallel operation can be for carrying out analog-to-digital conversion to the weight induction signal after amplifying.

Correspondingly, the invention provides a kind of engineering machinery, this project machinery comprises described weigher eventBarrier detection system.

Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail, still, the present invention does not limitDetail in above-mentioned embodiment, within the scope of technical conceive of the present invention, can be to the present inventionTechnical scheme carry out multiple simple variant, these simple variant all belong to protection scope of the present invention.

It should be noted that in addition each the concrete technology spy described in above-mentioned detailed description of the inventionLevy, in reconcilable situation, can combine by any suitable mode. For fear of needn'tThe repetition of wanting, the present invention is to the explanation no longer separately of various possible combinations.

In addition, between various embodiment of the present invention, also can be combined, as long as itsWithout prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.

Claims (14)

1. a weigher fault test set, is characterized in that, this equipment comprises:

LOAD CELLS, for output weight induced signal;

Whether signal processing apparatus, for there is event according to LOAD CELLS described in weight induction signal detectionBarrier;

Wherein said weight induction signal is sent to signal processing apparatus by passage independently.

2. weigher fault test set according to claim 1, is characterized in that, described letterNumber treating apparatus closes for linearity current between the weight induction signal in different LOAD CELLSs outputsIn the situation that system changes with respect to known linear relationship, judge that LOAD CELLS breaks down,Linear relationship between the weight induction signal of different LOAD CELLS outputs is closed with respect to known linearityIn the situation that system does not change, judge that LOAD CELLS does not break down.

3. weigher fault test set according to claim 1, is characterized in that, described letterNumber treating apparatus calculates between the weight induction signal of different LOAD CELLSs outputs current according to following formulaLinear relationship is with respect to the variable quantity of known linear relationship:

Wherein i ≠ j, i=1,2 ..., n, j=1,2 ..., n, n is LOAD CELLSQuantity,Be weight induction signal and j the LOAD CELLS output of i LOAD CELLS outputWeight induction signal between known linear relationship,Be the weight of i LOAD CELLS outputCurrent linear relationship between the weight induction signal of induced signal and j LOAD CELLS output;

Described signal processing apparatus is also at Δ_ijBe more than or equal in the situation of threshold value, judgement difference is weighedBetween the weight induction signal of sensor output, current linear relationship is sent out with respect to known linear relationshipChanging.

4. weigher fault test set according to claim 3, is characterized in that, at Δ_ijGroupIn the set becoming, at least two elements in the subset with identical i or j are all greater than the situation of threshold valueUnder, i LOAD CELLS or j LOAD CELLS break down, or with these at least twoTitle in the relevant LOAD CELLS of element except i LOAD CELLS or j LOAD CELLSRetransmitting sensor all breaks down.

5. weigher fault test set according to claim 4, is characterized in that, n equals 3;

Described signal processing apparatus, also at Δ₁₂And Δ₂₃All be greater than in the situation of threshold value, judge the 2ndIndividual LOAD CELLS breaks down, or the 1st LOAD CELLS and the 3rd LOAD CELLS all occurFault; At Δ₁₂And Δ₁₃All be greater than in the situation of threshold value, judge that the 1st LOAD CELLS breaks down,Or the 2nd LOAD CELLS and the 3rd LOAD CELLS all break down; At Δ₂₃And Δ₁₃All be greater thanIn the situation of threshold value, judge that the 3rd LOAD CELLS breaks down, or the 1st LOAD CELLS andThe 3rd LOAD CELLS all breaks down.

6. according to the weigher fault test set described in claim 3-5 any one, its feature existsIn, described signal processing apparatus is also for weighing according to following formula:

$W=F\·\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{D}_{3i}-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{D}_{1i}}{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{D}_{2i}-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{D}_{1i}};$

Wherein D_1iThe weight induction signal of i LOAD CELLS while not adding loads for weigher, D_2iForThe weight induction signal of i LOAD CELLS when weigher loaded weight F, D_3iAdd for weigher is currentThe weight induction signal of i LOAD CELLS when loads, W is the current weight that adds loads.

7. a weigher fault detection method, is characterized in that, the method comprises:

Sense weight, and output weight induced signal;

Whether break down according to LOAD CELLS described in weight induction signal detection;

Wherein said weight induction signal is by independently passage transmission.

8. weigher fault detection method according to claim 7, is characterized in that, according to heavyWhether amount induced signal detects described LOAD CELLS and breaks down and comprise:

Between the weight induction signal of different LOAD CELLSs output, current linear relationship is with respect toIn the situation that the linear relationship of knowing changes, judge that LOAD CELLS breaks down, in the difference biography of weighingLinear relationship between the weight induction signal of sensor output becomes with respect to known linear relationshipIn situation about changing, judge that LOAD CELLS does not break down.

9. weigher fault detection method according to claim 7, is characterized in that the methodAlso comprise: calculate current linearity between the weight induction signal of different LOAD CELLSs output according to following formulaRelation is with respect to the variable quantity of known linear relationship:

Wherein i ≠ j, i=1,2 ..., n, j=1,2 ..., n, n is LOAD CELLSQuantity,Be weight induction signal and j the LOAD CELLS output of i LOAD CELLS outputWeight induction signal between known linear relationship,Be the weight of i LOAD CELLS outputCurrent linear relationship between the weight induction signal of induced signal and j LOAD CELLS output;

The method also comprises: at Δ_ijBe more than or equal in the situation of threshold value, judge that different LOAD CELLSs are defeatedLinear relationship current between the weight induction signal going out changes with respect to known linear relationship.

10. weigher fault detection method according to claim 9, is characterized in that, at Δ_ijGroupIn the set becoming, at least two elements in the subset with identical i or j are all greater than the situation of threshold valueUnder, i LOAD CELLS or j LOAD CELLS break down, or with these at least twoTitle in the relevant LOAD CELLS of element except i LOAD CELLS or j LOAD CELLSRetransmitting sensor all breaks down.

11. weigher fault detection methods according to claim 10, is characterized in that, n equals3；

The method also comprises: at Δ₁₂And Δ₂₃All be greater than in the situation of threshold value, judge the 2nd weighing and sensingDevice breaks down, or the 1st LOAD CELLS and the 3rd LOAD CELLS all break down; At Δ₁₂And Δ₁₃All be greater than in the situation of threshold value, judge that the 1st LOAD CELLS breaks down, or the 2nd titleRetransmitting sensor and the 3rd weighing and sensing all breaks down; At Δ₂₃And Δ₁₃All be greater than in the situation of threshold value,Judge that the 3rd LOAD CELLS breaks down, or the 1st LOAD CELLS and the 3rd weighing and sensingDevice all breaks down.

12. according to the weigher fault detection method described in claim 9-11 any one, its featureBe, the method also comprises according to following formula and weighing:

$W=F\·\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{D}_{3i}-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{D}_{1i}}{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{D}_{2i}-\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{D}_{1i}};$

Wherein D_1iThe weight induction signal of i LOAD CELLS while not adding loads for weigher, D_2iForThe weight induction signal of i LOAD CELLS when weigher loaded weight F, D_3iAdd for weigher is currentThe weight induction signal of i LOAD CELLS when loads, W is the current weight that adds loads.

13. 1 kinds of weigher fault detection systems, is characterized in that, this system comprises according to claimWeigher fault test set described in 1-6 any one; This system also comprises:

Amplifier, for amplifying weight induction signal;

Analog-digital converter, for carrying out analog-to-digital conversion to the weight induction signal after amplifying.

14. 1 kinds of engineering machinery, is characterized in that, this project machinery comprises according to claim 12The weigher fault detection system of stating.