JP6865924B2 - Abnormality detection method of metal plate measurement value in metal plate weight measurement system - Google Patents

Description

The present invention relates to a method for detecting a measurement abnormality (presence or absence) of a load pile in a step of transporting a load pile in which a plurality of metal plates are stacked by using a metal plate unloading facility equipped with a measurement mechanism.

Electro-copper and electrolytic nickel (hereinafter collectively referred to as metal plates) manufactured by electrolytic refining, etc., are transferred from the manufacturing location to the storage location by a unloading facility in a state where a predetermined number of sheets are stacked (hereinafter referred to as a loading pile). It is transported and stored in its storage location for the period until shipment.

By the way, this manufactured metal plate may contain defective products that are insufficient in weight, but it is usually very difficult to detect defective products after they are accumulated in the storage location. , It is judged whether or not there is a defective product when it is conveyed by the transfer conveyor. Specifically, in the unloading equipment, the weight of the cargo pile is weighed using a measuring instrument provided in the middle of the transport conveyor, and the presence or absence of defective products is determined based on the weight.

Defective products often have abnormal shapes, and a pile of defective products mixed with stacked metal plates becomes bulky or collapses during transportation. Since the metal plate of the load pile that has collapsed is often caught by other load piles, peripheral devices, etc. during transportation, erroneous weighing is prevented by weighing twice in succession (see Patent Document 1).
In addition, the height of the load pile is measured during transportation by the conveyor, and whether or not the load pile filling rate calculated from the height of the load pile is within a predetermined range also determines that the defective product is defective. The presence or absence is being judged. As a result, the weight and the filling rate of the load pile are out of the regulation, and the weight and appearance of the load pile are checked, and if there is a defective metal plate contained in the load pile, it is removed.

Conventionally, as a method of measuring the weight of a load pile conveyed by a transfer conveyor, a method of floating the load pile from the transfer conveyor and measuring the weight of the load pile has been adopted (see Patent Document 2).
For example, when a conveyor having a pair of chains stretched in parallel while being separated from each other is used, a measuring instrument is provided between the pair of chains. Then, a lifter for lifting the load pile is installed on this measuring instrument. Then, if the load pile is lifted by the lifter, the load pile can be lifted from the pair of chains of the conveyor, so that the weight of the load pile is added only to the lifter (that is, only the measuring instrument). Therefore, the weight of the loading pile can be measured by a measuring instrument.

In the above-mentioned unloading equipment, the load pile weight value measured by the measuring instrument is transmitted to the control device, then processed as an electric signal in the control device and transmitted to the printing device and the product management system. For example, a programmable controller (PLC) is used for signal processing of the control device, but if a weight value processing error occurs inside the programmable controller for some reason, an incorrect weight value is printed. Since there is a possibility that the product will be shipped as it is, there has been a demand for a method for verifying the weight value handled by the control device. For example, it can be prevented by anomaly detection based on the loading factor filling rate as disclosed in Patent Document 3, but it has been required to detect it earlier.

Japanese Unexamined Patent Publication No. 2016-102765 Japanese Unexamined Patent Publication No. 8-337232 Japanese Unexamined Patent Publication No. 2015-018766

In view of the above circumstances, the present invention provides an abnormality detection system for a metal plate weighing value that can be detected as a weighing abnormality when the same weight value is continuously generated due to a processing error of a program or the like.

As a result of reviewing the operating principle of the control device, the present inventor updates and transmits the internal weight value for each mountain, but if this update function does not work or the update function is delayed, the following It was discovered that the same weight value could be transmitted for Niyama. As a result of examining the countermeasures, it was noted that the probability that the continuous loading piles had the same weight value was extremely low, and when the continuous loading piles showed the same weight value, it was regarded as abnormal, and the present invention was completed.

The first aspect of the present invention, in the unloading facility Niyama a stack of metal plates, a method for detecting abnormality Niyama weighing the metal plate weighing system for measuring the Niyama weight of the Niyama, at least A transport means having a flat portion on which one of the load piles is placed and transporting the load pile on the upper surface, and a state in which the load pile is placed on the flat portion, or the loaded load pile is placed flat. The weight of the load pile in the floated state was measured and the measured load pile weight value was obtained by measuring the load pile lifting means for raising the load pile and the load pile lifting means for floating the load pile. Later, the measuring means for placing the load pile on the flat portion and the verification means for verifying the correctness of the obtained measured load pile weight value are provided, and the verification means are adjacent to each other in a preset manner. It has a threshold value Δwa a for determining the pass / fail judgment of measurement between piles and a threshold value Δw b for determining the pass / fail judgment of measurement between the same piles, and two consecutive load piles GN-1 using the weighing means. the G N, when measuring in the order of G N-1, G N, performs a weighing twice per Niyama, measured Niyama weight value w N-1, remeasurement Niyama weight value w N-1 R , measured Niyama weight value w N, after obtaining the Niyama weight data in the order of remeasurement Niyama weight value w N R, a combination of two types of measurement Niyama weight values from the four measured Niyama weight value The following six types of difference equations f 1 , f 2 , f 3 , f 4 , h 1 , and the difference between the two types of measured load pile weight values obtained by selection and the difference between the threshold values Δwa a or Δw b. of the h 2, and one from the finite-difference formula f 1 ~f 4, to choose the one from the finite-difference formula h 1 ~h 2 used as a validation expression to validate the presence or absence of "abnormality of the metering means", "abnormal upon detecting a "is a method for detecting abnormality Niyama weighing the metal plate weighing system characterized in that it comprises a function of stopping the unloading facility.

In the second invention of the present invention, the verification means in the first invention uses the following two types of difference formulas as the verification formulas, and the results of the two types of difference formulas are combined to determine the presence or absence of "abnormality of the measuring means". This is a method for detecting an abnormality in a weighted load value in a metal plate weight measuring system, which comprises a function of stopping the unloading facility when an abnormality is detected.

According to the abnormality detection system according to the present invention, it is possible to detect erroneous measurement due to a processing error of a program or the like. Therefore, it becomes easy to prevent the erroneously weighed load pile from being shipped, so that a stable supply of the metal plate can be achieved.

It is a block diagram of the electrolytic copper carry-out equipment X which concerns on this invention. It is a loading pile weighing control flowchart which concerns on this invention. It is an external side view of the electrolytic copper carry-out equipment X which shows the transport form of a loading pile which concerns on this invention.

FIG. 1 is a configuration diagram of an electrolytic copper unloading facility X according to the present invention, FIG. 2 is a flow chart for weighing and controlling a cargo pile according to the present invention, and FIG. 3 is an external side view of the electrolytic copper unloading facility X showing a transport mode of a cargo pile. Then, the present invention will be described with reference to these FIGS. 1, 2, and 3.
Electrolytic copper produced have been defined size, packing equipment 1 in stacked in prescribed number copper Niyama (FIG. 3, reference numeral G _1, · · ·, denoted by G _N, hereinafter referred to as "Niyama" In some cases).
Normally, a pile of metal plates is processed by using a unloading facility. The unloading equipment includes a transport means (A) in which luggage is placed on the upper surface and the luggage is continuously or intermittently sent out, and a cargo pile lifting means (A) in which the loaded luggage is floated and the floated luggage is placed. B) and a weighing means (C) for measuring the weight of the floated luggage are provided, and the arrangement is as shown in FIG. 1, for example.
In this unloading facility, the load pile is of a conveyor type such as a conveyor 2 (see FIGS. 1 and 3) supported by a conveyor support column 2a (see FIG. 3, not shown in FIG. 1) of FIG. At the weighing position LM, which is transported by the transporting means and installed on the flat portion 3b provided in the middle of the transporting means, the weight of the loading pile is weighed by the loading pile lifting means (B) and the weighing means (C). It is carried out.

The load pile elevating means (B) is performed by a push-up cylinder 3a that lifts the load pile installed at the weighing position LM from below to bring it into a floating state.
The weighing means (C) includes a measuring instrument 3 for weighing the load pile, a control device 4 for controlling each operation of weighing and transport, a printing device 7 for printing the weighing result and other items on the load pile, and printing thereof. It is composed of a printing device control unit 6 that controls the device.

In this weighing means (C), the loading pile is temporarily stopped at the weighing position LM, weighed by the measuring instrument 3 to obtain the measured loading pile weight data d _W, and the obtained measured loading pile weight data d _W is controlled. It is transmitted to the device 4 (for example, a programmable controller).
By the way, the measured load pile weight data d _W transmitted to the control device 4 is verified by the verification means (D) shown below, and in the case of normal determination (pass), it is passed through the printing device control unit 6. is sent as print Niyama weight data d _P to the printing device 7 (for example, an ink jet printing apparatus), to print the print Niyama weight data d _P sends the print position LP the Niyama.

The cargo pile that has been printed is carried out to the loading position LD via the standby position LW _2, and is transported to a storage location (not shown) by the loading pile unloading heavy machine 14 (for example, a forklift).
On the other hand, a metering position LM or near (for example, the position and the printing device 7 immediately after) the Niyama height measured (e.g. by ultrasonic displacement meter), is transmitted to the control unit 4 Niyama as height data d _H. The load pile height data d _H is transmitted to the product management system 5, and is used for shipping management together with the _{measured load pile weight data d W.}

<Verification means (D)>
In copper unloading equipment X shown in FIGS. 1, 3, packing equipment 1 in stacked fabricated Niyama (code _G 1 in FIG. _{3, ···, G N, ···} ) is a conveying means (A) After being placed on a certain conveyor 2, it moves by the conveyor 2 in the operating state, _{passes through the standby position LW 1} , stops at the measuring position LM (above the flat portion 3b), and uses the measuring instrument 3 (measuring means (). According to C), the load pile weight is weighed.
After weighing of Niyama, measured Niyama weight data d _W obtained is sent to the control unit 4 (e.g., a programmable controller), the acceptance judgment is made as being performed verifying means (D) shown in FIG.
When the verification means (D) makes a normal determination, the measured load pile weight data d _W is processed into the print load pile weight data d _P , and then sent to the printing device 7 via the printing device control unit 6 for weighing. A printing device 7 (for example, an inkjet printing device) prints on the loading pile that is later moved to the printing position LP. In the case of abnormality judgment, the abnormality improvement measures are taken to obtain a normal cargo weight, and then the same processing as in the normal judgment is performed.

After the printing _{, the cargo pile is carried to the shipping position LD through the standby position LW 2} , and after confirming the printing state, the printing location, the printed content, the loading pile appearance, etc., the loading pile unloading heavy machine 14 (for example, It is shipped to a means of transportation such as a truck by a forklift). Further (subsequently or in parallel), the next load pile is weighed and the same load pile weight determination is repeated.

In the work of unloading and unloading electrolytic copper using the electrolytic copper unloading facility X of FIGS. 1 and 3, the weight is measured while continuously or intermittently transporting a plurality of cargo piles. In some cases, due to weighing abnormalities due to shape irregularities such as collapse of the loading pile, or due to malfunctions in the weighing means or control device, the weight data of the preceding loading pile is added to the subsequent loading pile in the two adjacent piles of electrolytic copper. It was difficult to detect the case where the problem of being recognized as the weight of the cargo pile and being printed was generated.

Therefore, the "Niyama G ₁ ~G _K ~G _N", conveying a sequence as shown in FIG. 3, in the present invention for weighing handled as pairs Niyama adjacent as indicated in the control flow of FIG. 2 .. For example, _{"G 1} and _{G 2", "G 2} and _{G 3",} ..., _{"G K-1} and _{G K",} ..., such as _{"G N-1} and _{G N"} Niyama Set a pair.
First, in the weighing means (C), _{the load pile weight of the preceding load pile GN-1} placed on the weighing position LM is weighed to obtain "measured load pile weight w _N-1 ", and then the measurement thereof. After the finished load pile GN _-1 was lowered by the load pile elevating means (B) and returned to the weighing position of the transport device, the push-up cylinder 3a was raised again to float the load pile above the transport conveyor 2. After the state is set, the load pile weight is remeasured with the measuring instrument 3 to obtain "remeasured load pile weight w _N-1 ^R ", and the load pile weight is placed on the original weighing position LM.
Then, move the Niyama placed on the weighing position LM subsequent Niyama G _N, the then weighed Niyama weight to obtain a "measuring Niyama weight w _N", similar to the preceding Niyama G _N-1 obtain a "re-measurement Niyama weight w _N ^R" and weighed again Niyama weight.

When each of the two weighings of the two loading piles is completed, the pass / fail judgment of the weighed loading pile weight is made. If the conveyor 2 of the transport means (A) is stopped until the pass / fail judgment is made (between the weighing and the pass / fail judgment), it is possible to easily take measures when the abnormality is judged (failed).
The pass / fail judgment for the load pile weight w _{N is based} on the four measured weight values of the obtained "measured load pile weight w _N-1 , w _N " and "remeasured load pile weight w _N-1 ^R , w _N ^R". Are combined and verified by the verification means (D). Specifically, if it is determined to be "abnormal" according to any of the criteria of "Niyama Weight Judgment Criteria I to II" shown below, the abnormality is resolved according to the prescribed "abnormality improvement procedure". After that, the corrected cargo pile weight is obtained by reweighing, and the loading pile unloading work is continued.
Hereinafter, a reference example of the pass / fail determination of the load pile weight in the present invention will be described.

[Pass / fail judgment of measured cargo weight]
As the pass / fail judgment standard, for example, the load pile weight judgment standard I or the load pile weight judgment standard II described later can be used.
1. 1. Niyama Weight Judgment Criteria I
One of the pass / fail judgments of the measured load pile weight is to use at least one of the difference formulas based on the difference between the two types of measured load pile weight values out of the four types of measured load pile weight values as the verification formula, and use the verification formula. The presence or absence of "abnormality of measuring means" is verified, and when the verification formula detects an abnormality, the unloading equipment is stopped.
Specifically, from the four types of measured load pile weight values, a difference formula based on the difference between the two types of measured load pile weight values and the threshold value is obtained as shown in the following equations (1) to (6). At least one of the difference formulas is used in the verification formula to find out the correctness of the assumed load pile weight value and to make a pass / fail judgment.

In the following equations (1) to (6), equations (1) and (2) indicate the difference in the weight of the cargo piles between "adjacent cargo piles" and "measurement-remeasurement cargo piles", and (3) and Equation (4) shows the difference in cargo weight between "adjacent cargo mountains", and equations (5) and (6) show the difference in weight between "same cargo mountains".
At least one of these difference equations is selected as the verification equation, and the correctness is determined depending on whether the result corresponds to any of the "loading pile weight determination criteria I".

Further, in this determination criterion I, one or more types of difference formulas selected from the above six types of difference formulas (1) to (2) and one or more types selected from the formulas (3) to (6) are used. It is desirable to combine it with the difference formula to make a verification formula.
Here, [Delta] w _a, [Delta] w _b is a threshold for determining the acceptance judgment is 0 or a positive value, [Delta] w _a threshold value for determining the acceptability determination of the metering of loads mountains adjacent, in [Delta] w _b are the same load mountainous It is a threshold value that determines the pass / fail judgment of measurement.

[Delta] w _a, if a positive value, in the measurement weight value meter 3 or the control unit 4 in the above step size at the time of internal processing, it is preferable to a measurement error or less become the value of the measuring instrument 3. When Δw _b is a positive value, it is preferable that the value is equal to or greater than the measurement error of the measuring instrument 3 and less than or equal to the weight of one metal plate.
For example, the weight of the metal plate 1 sheets 80 kg, 90 kg, 150 kg, often producing such a target 170 kg, since the measuring device 3 is generally used measuring instruments tolerances 1 kg, [Delta] w _a, [Delta] w _{Both b} can usually be set to 1.0 [kg]. Since the individual difference in weight of each metal plate is much larger than the measurement error of the measuring instrument 3, and the weight difference due to the collapse of the load is much larger than the measurement error of the measuring instrument 3, the occurrence rate of erroneous judgment is suppressed to a significantly low level. There is.

2. Niyama Weight Judgment Criteria II
Next, by using any two of the above equations (1) to (6) in combination, it is possible to separate and detect an abnormality due to "abnormality of cargo pile form" or "malfunction of weighing means". An example of the judgment criteria will be described.
This standard complies with the "Niyama Weight Judgment Criteria II" shown in Table 1 below, which uses the difference formulas represented by the following formulas (1) and (5) as verification formulas. The conditions in [] in the table indicate an abnormal state.

Obtained measurement Niyama weight w N-1 and w N, and remeasurement Niyama weight w N-1 R and w N R constitutes "| w N -w N R | (a repeated weighing of the same Niyama "Error)" and "| w N- w N-1 R | (Weighing difference between adjacent cargo piles with remeasurement)" are used as judgment parameters. Since Δwa a and Δw b are the same as those of the load pile weight determination standard I, the description thereof will be omitted.
Type P 1 of Table 1 is a state there was no abnormality in Niyama form to metering means (C) those corresponding to "normal" determination, P 2 and later, the weighing means (C), Niyama form Is a state in which some kind of abnormality has occurred, and corresponds to the "abnormality" judgment.

Type P ₂ is per abnormally, the Niyama G _N of the apparent weight w _N, a case which indicates that the anomaly of Niyama form occurs, can be detected with conventional methods of measuring the Niyama weight twice is there.

Type P ₃ are those per abnormally, weight difference Niyama neighboring indicating abnormality, the case of "malfunction of the metering means" equal Niyama weight of two mountains adjacent substantially ([Delta] w _a or below) Two states are included, in the latter case the weighing is performed normally. To distinguish between these two states, the Niyama weight anew Niyama G _N, or the metering means used to meter in another metering means independent, weighed such as by measuring a third Niyama It is effective to change the value and then measure again. In addition, this abnormality is a type of abnormality that cannot be detected by the conventional method.

Type P ₄ is per abnormal, a case of detecting an abnormality by the "malfunction of the metering means." Although this abnormality can be detected by the conventional method, it cannot be determined whether the abnormality is in the shape of the loading pile or the malfunction of the measuring means.

As shown in Table 1, the present invention measures the weight of one load pile twice to detect load pile defects due to "load pile morphology abnormality" in "measurement abnormality", and further, adjacent to each other. By combining the comparison of weights between cargo piles, it is a method that can detect abnormalities in weight data due to "malfunction of measuring means".

Hereinafter, the present invention will be described in more detail with reference to Examples.
In order to confirm the effect of the "verification means" according to the present invention, a weighing test of the load pile for weight measurement was performed using the electrolytic copper unloading equipment X of FIG. 1, and the "verification means (D)" shown in Table 1 " The pass / fail of the load pile weighing was judged according to the "Criteria II for determining the load pile weight". _{The threshold values Δwa a} and Δw _b that influence the determination were set to Δwa _a = Δw _b = 1 kg.

The four types of load piles used were the load pile 101 having a weight of 2635 kg, the load pile 102 having a weight of 2658 kg, the load pile 103 having a weight of 2817 kg, and the load pile 104 having a weight of 2620 kg shown in Table 2 below. When weighed in this order, the weight difference between Niyama 101 to 104 is 1 kg or more.
Further, the metering of Niyama is a metering sequence shown in Table 3, from the beginning Niyama No. 101, No. 101 ^R, 102 th, 102 th ^R, # 103, # 103 ^R, 104 number, in the order of 104 No. ^R Weighing is to be carried out (subscript R means the second weighing). Furthermore, the verification was decided to catch the abnormality between Nos. 102 to 103.
Here, Niyama Niyama _{G N-1} to No. 102, have gone to resemble the a Niyama 103rd Niyama _{G N.} The true weight of the cargo pile is a measured value obtained by individually weighing each cargo pile.

Tables 4 to 9 show the measurement order and measurement results of Examples 1 to 4, Comparative Example 1, and Conventional Examples.
In these tables, the "solid arrow" indicates the order of measurement, and verification was performed using the measurement values on both sides of the solid arrow.

As Example 1, a measurement test was conducted in which the weights of Niyama 101 to 104 were measured in the order of 101 to 104. The weighing results of each load pile weight as shown in Table 4 below were obtained.
The result, combined light of the "Niyama weight criteria II" in Table 1, was in a state "normal P _1".

As the second embodiment, a weighing test was conducted on the assumption that a malfunction of the weighing means occurs at the time of the first weighing of Niyama 103 and the measured value is inherited at the time of remeasurement. That is, the memory of the programmable controller was temporarily write-protected so that the measured values at the first and remeasurement of Niyama 103 _{indicate w 102.} The weighing results of each load pile weight as shown in Table 5 below were obtained.
The result, combined light of the "Niyama weight criteria II" in Table 1, a state "abnormality P _3", it is detected that the "malfunction of the metering means" has occurred.

Note that this "anomaly of P _3", since the weight difference of Niyama neighboring shows the abnormality, the "case of error operation of the metering means" Niyama weight of two mountains which "adjacent approximately equal contains two states ([Delta] w _a less) ", in the latter case had to weigh is successful.
To distinguish between these two states, the Niyama weight again Niyama C _N, although other verification means such as the metering means used to measure in a different metering means independent is desired, this abnormal Was a type of anomaly that could not be detected by conventional methods.

As the third embodiment, as in the second embodiment, a weighing test was performed on the assumption that the weighing means malfunctioned at the time of the first weighing of the loading pile 103, and when the loading pile 103 was reweighed, the loading pile was different from the second embodiment. This is a case where _{"w 103} ", which is the true weight value of No. 103, is weighed. That is, the initial calibration value of Niyama 103 _{indicates w 102,} and the memory of the programmable controller was temporarily write-protected so as to weigh the true weight value w _{103 at the time of reweighing.} The weighing results of each load pile weight as shown in Table 6 below were obtained.
The result, combined light of the "Niyama weight criteria II" in Table 1, a state "abnormality P _4", No. 102 Niyama adjacent, there is no difference in weight between the 103rd states, and Niyama Two abnormalities were detected, in which the measurement results of the 103rd repetition were different.

In this way, by verifying the two conditions of the presence or absence of an abnormality between adjacent cargo piles and the presence or absence of an abnormality between two measurements of the same cargo pile, it is possible to detect the abnormality as in Example 3, and "loading". Even when the "mountain shape" is in the normal state, the abnormal state due to the "malfunction of the measuring means" can be detected as in the second embodiment. That is, "f ₁ = | w _N- w _N-1 ^R _{| -Δw a} " due to the adjacent loading piles accompanied by remeasurement _{satisfies the condition of "f 1} ≤ 0", and thus "wrong measurement means". It was determined that the condition was abnormal due to "operation".

As Example 4, a measurement test was conducted on the assumption that an abnormality in the shape of the loading pile was detected. That is, when the first measurement of Niyama 103 is completed, the top one of Niyama 103 is moved so that it can be leaned from the outside of the measuring instrument to the side surface of Niyama 103. second measurement after Niyama 103 number (ie # 103 ^R) was carried out. As a result, the weighing results of each load pile weight as shown in Table 7 below were obtained.
In the light of this result to Niyama weight criterion II of Table _{1, h 1 = | w 103} -w 103 R | -Δw 2 = | 2817kg-2783kg | because it is -1 kg> 0, the _{"P 2} abnormality Detected as a state.

(Conventional example 1)
As a conventional example, the same procedure as in Example 2 was carried out except that the conventional standard was used instead of the load pile weight determination standard according to the present invention. As a result, the measurement result of each load pile weight as shown in Table 8 was obtained. It was. The conventional standard is common to the load pile weight determination standard II in that the repeatedly weighed weight is used, but differs from the load pile weight determination standard II in that the verification between adjacent load piles is not performed.
As a result, it was not possible to detect "malfunction of the weighing means" caused by a malfunction of the weighing means.

(Conventional example 2)
In the conventional method of weighing each load pile only once, the memory of the programmable controller was temporarily write-protected as in the second embodiment, and a weighing test was conducted. Naturally, the load pile weight of load pile 103 was Since it was not weighed accurately and there was no verification means, the malfunction of the weighing means could not be detected.
Table 9 below shows the measurement results.

1 Packing equipment 2 Conveyor conveyor 2a Conveyor support 3 Measuring instrument (main body)
3a Push-up cylinder 3b Flat part 4 Control device 5 Product management system 6 Printing device control unit 7 Printing device 14 Heavy equipment for loading and unloading LW ₁ , LW ₂ Standby position LM Weighing position LP Printing position LD Unloading position (A) Transport means (A) B) Loading platform lifting means (C) Measuring means (D) Verification means X Electrocopter carrying equipment d _W Measured loading pile weight data d _H Loading pile height data d _P Printed loading pile weight data

Claims (2)

It is a method of detecting an abnormality in the weight of a load pile in a metal plate weight measurement system that measures the weight of the load pile of the load pile in a loading pile carrying-out facility in which metal plates are stacked.
A transport means having at least a flat portion on which one pile of the load pile is placed and carrying the load pile on the upper surface.
A load pile elevating means for placing the load pile on the flat portion or floating the loaded load pile from the flat portion.
A state in which the load pile is floated by using the load pile elevating means, the weight of the load pile in the floated state is measured to obtain a measured load pile weight value, and then the load pile is placed on the flat portion. Weighing means and
Equipped with a verification means to verify the correctness of the obtained measured load pile weight value,
The verification means
_{The threshold value Δwa a} for determining the pass / fail judgment of weighing between adjacent cargo piles _{and the threshold value Δw b} for determining the pass / fail judgment for weighing between the same piles are determined in advance.
The use of a metering means, the two continuous Niyama G _N-1, G _N, when measuring in _the order _{of G N-1,} G _N, performs a weighing twice per Niyama, measured Niyama weight After obtaining the load pile weight data in the order of value w _N-1 , remeasured load pile weight value w _N-1 ^R , measured load pile weight value w _N , and remeasured load pile weight value w _N ^R , the above four types measurements Niyama from the weight values of two measurements Niyama weight value combining selected obtained the two kinds of measurement Niyama due to the difference between the difference between the weight value and the threshold value [Delta] w _a or [Delta] w _b following six types of Of the difference equations f ₁ , f ₂ , f ₃ , f ₄ , h ₁ , and h ₂ .
When one type from the difference formulas f _{1 to} f ₄ and one type from the difference formulas h _{1 to h 2} are selected and used as the verification formula to verify the presence or absence of "abnormality of the measuring means" and "abnormality" is detected. method for detecting abnormality Niyama metric in the feature and be Rukin genus plate weighing system further comprising a function of stopping the discharge equipment on.

The verification means
The following two types of difference formulas are used as the verification formulas, and the results of the two types of difference formulas are combined to verify the presence or absence of "abnormality of the measuring means", and when an abnormality is detected, the unloading facility is stopped. The method for detecting an abnormality in a load pile measurement value in the metal plate weight measuring system according to claim 1, wherein the metal plate weight measuring system is provided.

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