JP2004191156A - Combined weighing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To materialize combination at high probability by predicting satisfaction or failure of the combination in advance, and to provide thereby a combined weighing device capable of enhancing an operation rate. <P>SOLUTION: When main combination is selected by main combination computation using weighting hoppers 16<SB>1</SB>-16<SB>6</SB>shown by a thick dot line of a symbol A as objects, precombination computation is executed using as objects pooling hoppers 15<SB>1</SB>, 15<SB>5</SB>for supplying weighing objects X, X to the weighing hoppers 16<SB>2</SB>-16<SB>4</SB>, 16<SB>6</SB>not selected and shown by a thin dot line of a symbol B, and the selected weighing hoppers 16<SB>1</SB>, 16<SB>5</SB>. When the precombination computation is not materialized as a result therein and when the unoccupied pooling hopper 15<SB>1</SB>exists in the objects of the precombination computation, a supply amount of a weighing object X<SB>13</SB>' from a feeder to the pooling hopper 15<SB>1</SB>is controlled to an amount to satisfy the precombination by the weighing object X<SB>13</SB>' and, for example, a weighing object X<SB>21</SB>held in the weighing hopper 16<SB>2</SB>. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a combination weighing device that weighs an object to be weighed by a plurality of weighing means and weighs the object to a predetermined target weight based on the weighing result, and belongs to the technical field of an article weighing device.
[0002]
[Prior art]
Among weighing devices used for a wide range of applications, a combination weighing device used when a plurality of objects to be weighed, such as agricultural products, marine products, and snacks, each of which has an inconsistent weight, is combined to a predetermined target weight is a weighing hopper. Are weighed and distributed, and a combination operation is performed based on the measured values. As a result, the combination weight matches the target weight or is closest to the target weight within a predetermined allowable range. A weight combination is selected, and an object to be weighed is discharged only from the weighing hopper corresponding to the combination.
[0003]
In such a combination weighing device, there is a combination weighing device in which the probability of establishment of a combination in which the combination weight falls within an allowable range with respect to a target weight is improved to improve the operation rate. There has been proposed a configuration capable of discharging in two directions, that is, an (auxiliary hopper) direction and a collecting chute direction (for example, see Patent Document 1).
[0004]
According to this, in addition to the weighing value of the weighing object in the weighing hopper, the weighing value of the weighing object in the booster hopper also participates in the combination calculation, so that the number of participating weighing values during the combination calculation is surely increased. As a result, the combination is established with a high probability.
[0005]
In addition, a combination weighing device of a type in which a pool hopper also has a weighing function has been proposed (for example, see Patent Document 2).
[0006]
In this case, in addition to the weighing value of the object in the weighing hopper, the weighing value of the object in the pool hopper also participates in the combination calculation. By reliably increasing the number of participating metric values, the combination is established with a high probability.
[0007]
[Patent Document 1]
JP-A-7-63599 (page 6, FIG. 5)
[Patent Document 2]
JP-A-63-250528 (pages 2 to 3)
[0008]
[Problems to be solved by the invention]
By the way, in such a combination weighing device, when the combination is not established, as an effective measure, the object to be weighed is additionally supplied from the pool hopper to the weighing hopper, and then the combination calculation may be performed again. However, according to the combination weighing devices described in Patent Literature 1 and Patent Literature 2, although the combination is certainly established with a high probability, there is no recognition of additional supply measures when the combination is not established. As for the measures to be taken when the combination is not established, Patent Document 1 only describes that all the objects to be weighed by the weighing hoppers are discharged out of the system via the collecting chute, but the operation rate is still improved. I have to say that issues remain.
[0009]
In view of the above situation, it is an object of the present invention to provide a combination weighing device capable of forming a combination with a high probability by predicting whether a combination is to be established or not in advance, thereby improving an operation rate. .
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is characterized in that it is configured as follows.
[0011]
First, the invention according to claim 1 includes a plurality of first hoppers for holding a supplied object to be weighed, and a plurality of first hoppers provided above and corresponding to the first hoppers. A plurality of second hoppers to be supplied, a plurality of feeders to supply the objects to be weighed to the respective second hoppers, a plurality of weighing means provided in each of the hoppers, and a weighing value from the weighing means are combined and calculated. A weighing value of an unselected hopper when a combination of hoppers is selected by the calculating means, and a preliminary calculating means for performing a preliminary combination calculation. It is characterized by having.
[0012]
According to the present invention, by performing the preliminary combination calculation based on the result of the combination calculation based on the current measurement value, it is possible to predict whether or not the combination will be established in the next combination calculation. That is, when it is predicted that the combination is not established, it is possible to take measures for establishment, and thus the operation rate is improved.
[0013]
Next, a second aspect of the present invention is the combination weighing device according to the first aspect, wherein the combination is not established by the preliminary combination calculation by the preliminary calculation means and there is an empty second hopper. And a supply amount control means for controlling the supply amount of the object to be weighed to the empty second hopper so that the preliminary combination calculation is established.
[0014]
According to this invention, the invention described in claim 1 is embodied. In other words, if the preliminary combination calculation indicates that the preliminary combination is not established, an appropriate amount of the object to be weighed is supplied from the feeder to the empty second hopper so that the preliminary combination is established. Is established.
[0015]
According to a third aspect of the present invention, in the combination weighing device according to the first or second aspect, the arithmetic means calculates a plurality of combinations in one operation and performs the calculation by the preliminary arithmetic means. It is characterized in that the combination that establishes the preliminary combination is selected.
[0016]
According to the present invention, it is possible to calculate a plurality of combinations at the time of the combination calculation, and select a combination from among the combinations such that the preliminary combination is established at the time of the preliminary combination calculation. Therefore, it is possible to establish the next combination while maintaining the combination accuracy.
[0017]
According to a fourth aspect of the present invention, in the combination weighing device according to the second or third aspect, when the combination is not selected by the arithmetic unit, the object to be weighed in the second hopper is removed. An additional supply unit for additionally supplying the one hopper is provided, and the supply amount control unit controls the supply amount of the object to be weighed from the feeder to the second hopper even when the additional supply unit performs the additional supply. It is characterized in that control is performed such that the sum of the weighed value of the hopper and the weighed value of the first hopper does not exceed a predetermined value.
[0018]
According to the present invention, when the combination is not established as a result of the combination operation and the additional weighing object is supplied from the second hopper to the first hopper in response to the combination, the weighing object is supplied from the feeder to the second hopper. Is controlled to an appropriate amount so as not to cause overscaling in the first hopper. That is, the occurrence of overscaling that is directly linked to the stoppage of the operation of the combination weighing device is avoided. The overscale is an abnormality caused by the supply of an object to be weighed exceeding the measurement standard limit of the weighing hopper or the supply of an object to be weighed exceeding the storage capacity of the weighing hopper.
[0019]
According to a fifth aspect of the present invention, in the combination weighing device according to any one of the first to fourth aspects, when the combination is not selected by the arithmetic means, the held weighing object is replaced with the second weighing object. An additional supply target hopper selecting means is provided for selecting a second hopper for which the combination is established by supplying to one hopper, and the arithmetic means includes a second hopper selected by the additional supply target hopper selection means. The combination calculation is performed based on the measured value of the object to be weighed supplied to the first hopper.
[0020]
According to the present invention, the object to be weighed is additionally supplied from the second hopper to the first hopper so that the combination is established even if the combination is not established as a result of the combination operation. It will be more effective as a countermeasure.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a combination weighing device according to an embodiment of the present invention will be described.
[0022]
As shown in FIG. 1, the combination weighing device 1 has a box-shaped main body case 12 supported by a plurality of support legs 11... 11 on a frame 10, and the main body case 12 is provided with snacks such as snacks and candy. A dispersion table 13 for dispersing the objects, a plurality of feeders 14... 14 radially arranged around the dispersion table 13, a pair of upper and lower pool hoppers 15. .. 16 are assembled. In this case, the pool hoppers 15... 15 and the weighing hoppers 16... 16 are respectively connected with weight detectors 15 a. You.
[0023]
The objects to be weighed supplied to the combination weighing device 1 by the supply means (not shown) are firstly distributed to the feeders 14... 14 almost uniformly by the vibration type dispersion table 13, and then the vibrating type feeders 14. 15 are supplied to the weighing hoppers 16... 16 via the pool hoppers 15..., And the respective weights are weighed by the weighing hoppers 16.
[0024]
Individual chutes 17... 17 are arranged below the weighing hoppers 16... 16 respectively. As a result of the combination calculation, the objects to be weighed are discharged from the weighing hoppers 16. . The objects to be weighed which have been discharged and slipped down the individual chutes 17 are collected by a funnel-shaped collecting chute 18 arranged substantially at the center of the combination weighing device 1 and supplied to a further downstream device such as a packaging machine. Will be.
[0025]
As shown in FIG. 2, the control system of the combination weighing device 1 is provided with a control unit 20 which controls the weighing device 1 as a whole and is a characteristic part of the present invention.
[0026]
The control unit 20 receives weighing signals from the weight detectors 16a... 16a provided in the respective weighing hoppers 16... 16 and performs a combination calculation based on these weighing signals so that the target weight is within an allowable range. Select the combination that will be the combination weight to which it belongs.
[0027]
The control unit 20 calculates a plurality of combinations in which the combination weight falls within the allowable range with respect to the target weight by the combination calculation. Remember.
[0028]
Further, the control unit 20 reserves the weighing values of the weighing hoppers 16... 16 not selected as a combination and the weighing values of the pool hoppers 15. A combination calculation is performed, and a preliminary combination whose combination weight falls within an allowable range with respect to the target weight is selected.
[0029]
Further, when the combination is not established, the control unit 20 causes the pool hopper 15 to additionally supply the object to be weighed to the weighing hopper 16, and upon additional supply, inputs a weighing signal from the weight detector 15a of the pool hopper 15; Based on the weighing signal and the weighing signal from the weight detector 16a of the weighing hopper 16, the supply amount of the object to be weighed from the feeder 14 to the pool hopper 15 is controlled.
[0030]
Further, when the combination is not established, the control unit 20 causes the pool hopper 15 to additionally supply the object to be weighed to the weighing hopper 16 and, at the time of the additional supply, supplies the held object to be weighed to the weighing hopper 16 so that the combination is completed. The pool hopper 15 to be established is selected.
[0031]
The control unit 20 receives a discharge request signal from a downstream packaging machine or the like, and based on the signal, a gate opening / closing mechanism 15b ... 15b, which opens and closes the gate of the pool hopper 15 ... 15 or the weighing hopper 16 ... 16. By outputting a control signal to 16b... 16b, the objects to be weighed are discharged from these hoppers 15.
[0032]
Next, control examples executed by the control unit 20 when performing combination weighing with the combination weighing device 1 will be sequentially described.
[0033]
First, as a result of the preliminary combination calculation, when the preliminary combination is not established, the supply amount of the object to be weighed from the feeder 14 to the empty pool hopper 15 is controlled so as to be the amount in which the preliminary combination is established. This will be described with reference to FIGS. In particular, in the description with reference to FIGS. 5 to 7, the pool hoppers 15... 15, the weighing hoppers 16. X... X are given subscripts, and in the following description, subscripts will be used as appropriate.
[0034]
As shown in FIG. 3, at the start of the operation of the combination weighing device 1, in step S1, the supply target value W of the objects X ... X from the feeders 14 ... 14 to the pool hoppers 15 ... 15. _PO Is the default supply target value W _PD Set to. In this combination weighing device 1, for example, if six weighing hoppers 16... 16 are provided, the pool hoppers from the feeders 14. 15... Target supply value W of the object to be supplied to 15 _PD Is set. That is, the default supply target value W in this case _PD As an example, a value obtained by dividing the target weight at the time of the combination calculation by “2.5” is exemplified.
[0035]
In step S2, the feeders 14... 14 are driven to set the preset supply target value W. _PO X are supplied to the empty pool hoppers 15... 15 so that the weight values of these Xs are measured by the weight detectors 15 a. Enter In this case, since the operation has just started, the pool hopper 15 ₁ ~ 15 ₆ Are all empty and the supplied weighing object X ₁₁ ~ X ₆₁ Is pool hopper 15 ₁ ~ 15 ₆ (See FIG. 5A).
[0036]
In step S3, the gate opening / closing mechanisms 15b ... 15b of the pool hoppers 15 ... 15 are driven to supply the objects X ... X from the pool hoppers 15 ... 15 to the weighing hoppers 16 ... 16, and then the weighing hoppers 16 ... 16 The weight values of these objects to be weighed X... X by the weight detectors 16a. In this case, the weight detectors 16a... 16a of the weighing hoppers 16. Since the operation has just started, the weighing hopper 16 ₁ ~ 16 ₆ Are all empty and the weighing object X previously supplied ₁₁ ~ X ₆₁ Is the weighing hopper 16 ₁ ~ 16 ₆ (See FIGS. 5A and 5B).
[0037]
Then, in step S4, new weighing objects X ... X are supplied from the feeders 14 ... 14 to the empty pool hoppers 15 ... 15, and then the weighing values of these weighing objects X ... X are input. The weighing object X supplied this time ₁₂ ~ X ₆₂ Is pool hopper 15 ₁ ~ 15 ₆ (See FIG. 5B).
[0038]
In step S5, a main combination calculation is performed on the weighing hoppers 16... 16, and in step S6, as a result of the main combination calculation, it is determined whether a main combination whose combination weight falls within an allowable range with respect to the target weight is established. judge. In FIG. 5C, the target group of the main combination operation is indicated by the thick chain line of the symbol A. In this case, two weighing hoppers 16 are used. ₁ , 16 ₃ That is, the weighing object X ₁₁ , X ₃₁ , The main combination is established.
[0039]
If YES is determined in the step S6, a preliminary combination operation is performed on the weighing hoppers 16... 16 not selected as the main combination and the pool hoppers 15. Do. In FIG. 5C, the target group of the preliminary combination calculation is indicated by a thin chain line of a reference symbol B. In this case, one weighing hopper 16 ₅ That is, the weighing object X ₅₁ And one pool hopper 15 ₁ That is, the weighing object X ₁₂ And the preliminary combination is established.
[0040]
In step S8, the weighing hopper 16 selected by the main combination calculation ₁ , 16 ₃ The gate opening / closing mechanisms 16b, 16b are driven to ₁ , 16 ₃ To be measured X to individual chutes 17 and 17 ₁₁ , X ₃₁ Is discharged, and in step S9, the object X ₁₁ , X ₃₁ Hopper 16 that discharges ₁ , 16 ₃ Pool hopper 15 corresponding to ₁ , 15 ₃ To be weighed X ₁₂ , X ₃₂ Are supplied, these objects X are weighed. ₁₂ , X ₃₂ Is input (see FIG. 5D).
[0041]
In step S10, a main combination operation is performed on the weighing hoppers 16... 16, and in step S11, as a result of the main combination operation, it is determined whether or not a main combination in which the combination weight falls within an allowable range with respect to the target weight is established. judge. In FIG. 6A, the target group of the main combination calculation is indicated by the thick chain line of the reference character A. In this case, as shown in the result of the preliminary combination calculation in step S7, the two weighing hoppers 16 ₁ , 16 ₅ That is, the weighing object X ₁₂ , X ₅₁ , The main combination is established.
[0042]
If NO is determined in step S6 or step S11, the process proceeds to step S12, where the object X to be weighed is additionally supplied from the pool hopper 15 corresponding to the preset weighing hopper 16, and then the process returns to step S5.
[0043]
If YES is determined in the step S11, in a step S13, the preliminary combination calculation is performed on the weighing hoppers 16... 16 not selected as the main combination and the pool hoppers 15. Do. In FIG. 6A, the target group of the preliminary combination calculation is indicated by a thin chain line of a code B, and an empty pool hopper 15 is shown. ₁ Is also targeted. In this case, the preliminary combination is not established.
[0044]
In step S14, as a result of the preliminary combination calculation, it is determined whether or not a preliminary combination in which the combination weight falls within the allowable range with respect to the target weight is established. For example, in response to the example of FIG. If it is determined, in step S15, it is determined whether or not any of the pool hoppers 15 to be subjected to the preliminary combination calculation in step S13 is empty. In this case, as is apparent from FIG. ₁ Corresponds to this.
[0045]
If YES is determined in the step S15, an appropriate amount of the weighing object X is supplied from the feeder 14 to the empty pool hopper 15 to be subjected to the preliminary combination calculation in a step S16, and the weighing value of the weighing object X is input. . The appropriate amount in this case is an amount that accurately establishes the main combination in the next main combination calculation. In FIG. 6B, the pool hopper 15 ₁ To be weighed X _Thirteen 'Are supplied.
[0046]
Here, step S16 will be described in detail. As shown in FIG. 4, in step S16A, the combination target value W to the default supply target value W are set for the group indicated by the dashed line B in FIG. _PD WW obtained by subtracting _PD Is calculated as the target weight, and in step S16B, the optimum combination is selected. With this optimum combination, the combination weighing value W _S Is obtained.
[0047]
In step S16C, the pool hopper 15 ₁ Next weighing object X to _Thirteen 'Target supply value W _PO From the combination target value W to the combination weighing value W according to the combination selected in step S16B. _S WW obtained by subtracting _S Then, in step S16D, the pool hopper 15 is ₁ To be weighed X _Thirteen ′, And then the object to be weighed X _Thirteen Enter the weighing value of '. As a result, according to the example of FIG. _Thirteen 'And weighing hopper 16 ₂ To be weighed X held in ₂₁ Thus, the next main combination is established.
[0048]
That is, the proper amount of the object X to be weighed supplied to the empty pool hopper 15 to be subjected to the preliminary combination calculation specified in the step S15 is reliably transferred to the weighing hopper 16 that becomes empty by performing the subsequent steps S8 and S9. Is selected by the main combination calculation in step S10. If there are a plurality of empty pool hoppers 15... 15, one pool hopper 15 for supplying an appropriate amount of the object X may be set in advance.
[0049]
Then, returning to FIG. 3, in step S17, the supply target value W of the objects X ... X from the feeders 14 ... 14 to the pool hoppers 15 ... 15 _PO Is the default supply target value W _PD , And in step S18, the pool hopper 15 is ₁ After the objects to be weighed X are supplied to the empty pool hoppers 15 to 15 at a normal supply amount, the weighed values of these objects to be weighed X are input. In FIG. 6B, the pool hopper 15 ₃ To be weighed X ₃₃ Is supplied.
[0050]
Next, returning to step S8, the weighing hopper 16 selected in the previous main combination calculation is performed. ₁ , 16 ₅ To be weighed X ₁₂ , X ₅₁ Is discharged, and in step S9, the object X ₁₂ , X ₅₁ Hopper 16 that discharges ₁ , 16 ₅ Pool hopper 15 corresponding to ₁ , 15 ₅ To be weighed X _Thirteen ', X ₅₂ Are supplied, these objects X are weighed. _Thirteen ', X ₅₂ Enter the weighing value of. As described above, in the next main combination calculation, the two weighing hoppers 16 ₁ , 16 ₂ That is, the weighing object X _Thirteen ', X ₂₁ , A main combination is established (see FIG. 6C).
[0051]
On the other hand, if YES is determined in the step S14, the process proceeds to a step S18, where the objects X ... X are supplied from the feeders 14 ... 14 to the empty pool hoppers 15 ... 15 at a normal supply amount. ... Enter the weighing value of X. In FIG. 7A, the target group of the preliminary combination calculation is indicated by a thin dashed line B, and in this case, one weighing hopper 16 ₃ That is, the weighing object X ₃₂ And one pool hopper 15 ₅ That is, the weighing object X ₅₂ And the preliminary combination is established. In FIG. 7B, two empty pool hoppers 15 are provided. ₁ , 15 ₃ To be weighed X _Thirteen , X ₃₃ Is supplied.
[0052]
Then, after executing step S18, the process returns to step S8 and step S9. That is, the weighing hopper 16 ₁ , 16 ₅ To be weighed X ₁₂ , X ₅₁ Is discharged, and the object X is weighed. ₁₂ , X ₅₁ Hopper 16 that discharges ₁ , 16 ₅ Pool hopper 15 corresponding to ₁ , 15 ₅ To be weighed X _Thirteen , X ₅₂ Are supplied, these objects X are weighed. _Thirteen , X ₅₂ Is input (see FIG. 7 (c)).
[0053]
Also, if the determination is NO in step S15, the process proceeds to step S18 to execute the subsequent control.
[0054]
Thus, by performing the preliminary combination operation based on the result of the main combination operation, it is possible to predict whether the main combination will be established or not in the next main combination operation. That is, when the preliminary combination calculation predicts that the preliminary combination is not established, the proper amount of the object X to be weighed is supplied from the feeder 14 to the specified empty pool hopper 15 so that the preliminary combination is established. The main combination is established at the time of the combination calculation, and the operation rate is reliably improved.
[0055]
Next, when the main combination is not established as a result of the main combination calculation, the supply amount when the object X to be weighed is additionally supplied from the pool hopper 15 to the predetermined weighing hopper 16 is controlled. This will be described with reference to FIG. In particular, in the description with reference to FIG. 10, the pool hoppers 15... 15, the weighing hoppers 16. Are given subscripts, and in the following description, subscripts are used as appropriate.
[0056]
As shown in FIG. 8, at the start of the operation of the combination weighing device 1 in the same manner as described above, in step S21, the supply target value W of the objects to be weighed X... X from the feeders 14. _PO Is the default supply target value W _PD Set to. Hereinafter, the control in steps S22 to S36 is substantially the same as that in steps S2 to S16, and a description thereof will be omitted.
[0057]
In step S36, after the feeder 14 supplies to the empty pool hopper 15 to be subjected to the preliminary combination calculation an amount of the objects X to which the preliminary combination is established, that is, an amount of the main combination to be established in the next main combination operation, The weighed value of the weighing object X is input, and in a step S37, it is determined whether or not there is an empty pool hopper 15 for supplying the weighing object X to the weighing hopper 16 to be additionally supplied. In this case, in FIG. 6A, the weighing hopper 16 to be additionally supplied is used. ₃ Pool hopper 15 corresponding to ₃ Is correspondingly empty.
[0058]
If YES is determined in the step S37, an appropriate amount of the weighing object X is supplied from the feeder 14 to the empty pool hopper 15 in a step S38, and then the weighing value of the weighing object X is input. In FIG. 10A, the empty pool hopper 15 ₃ To be weighed X ₃₃ Is supplied. The pool hopper 15 ₁ In step S36, an appropriate amount of the weighing object X to establish the preliminary combination described in step S36 is set. _Thirteen 'Are supplied. In addition, two weighing hoppers 16 ₁ , 16 ₅ To be weighed X held in ₁₂ , X ₅₁ , The main combination is established.
[0059]
Here, the step S38 will be described in detail. As shown in FIG. 9, in the step S38A, a preset weighing hopper 16 is set. ₃ Measurement standard limit value W _L Weighing hopper 16 ₃ Weighing object X in ₃₂ Weight value W _W W obtained by subtracting _L -W _W Is the default supply target value W _PD Is determined. The measurement standard limit value W _L When an object X having a weight exceeding this is supplied to the weighing hopper 16, an overscale abnormality occurs and a weight limit that causes the operation of the combination weighing apparatus 1 to be stopped is given. In addition, some overscales are also generated by supplying a weighing object X having a volume exceeding the storage allowable volume of the weighing hopper 16, but in this case, the storage allowable volume value is determined using the specific gravity of the weighing object X. Converted to the allowable storage weight value, _L This storage allowable weight value may be used instead of.
[0060]
If NO is determined in the step S38A, the process proceeds to a step S38B. ₃ Next weighing object X to ₃₃ ″ Supply target value W _PO With the subtraction value W _L -W _W Is set as a value obtained by dividing by "2" as an example, and in step S38C, the pool hopper 15 ₃ To be weighed X ₃₃ ″, Then the object X ₃₃ Is input. In the example shown, the subtraction value W is input. _L -W _W Is divided by “2”, but usually values of “1” to “3” are used.
[0061]
Then, if YES is determined in step S38A, while if NO is determined, the above-described steps S38B and S38C are executed, and the process returns to FIG. Specimen X ... Supply target value W of X _PO Is the default supply target value W _PD , And in step S40, the two pool hoppers 15 are fed from the feeders 14. ₁ , 15 ₅ Normal supply target value W to empty pool hoppers 15 ... 15 other than _PO Are supplied, the weighing values of these weighing objects X... X are input. In the example of FIG. 10A, there is no pool hopper 15 corresponding to this.
[0062]
After step S40, the process returns to step S28, and the weighing hopper 16 selected in the main combination calculation is performed. ₁ , 16 ₅ To be weighed X ₁₂ , X ₅₁ Is discharged, and in step S29, the object X ₁₂ , X ₅₁ Hopper 16 that discharges ₁ , 16 ₅ Pool hopper 15 corresponding to ₁ , 15 ₅ To be weighed X _Thirteen ', X ₅₂ Are supplied, these objects X are weighed. _Thirteen ', X ₅₂ Is input (see FIG. 10B).
[0063]
In this case, the pool hopper 15 ₃ To be weighed X held in ₃₃ ″ Is the subtraction value W _L -W _W Supply target value W obtained by dividing by 2 _PO Therefore, when the main combination calculation fails, the weighing hopper 16 to be additionally supplied is supplied. ₃ No over-scaling occurs even if additional supply is performed.
[0064]
On the other hand, if “YES” is determined in the step S34, or if “NO” is determined in the step S35, the process proceeds to the step S37, and the subsequent control is executed. Then, if NO is determined in the step S37, the process proceeds to a step S40 to execute the subsequent control.
[0065]
By doing so, as a result of the main combination calculation, the main combination becomes unsatisfied, and in response to this, when the additional supply of the weighing object X is performed from the corresponding pool hopper 15 to the predetermined weighing hopper 16, the feeder 14 The supply amount of the object X to be weighed to the hopper 15 is controlled in advance to an appropriate amount such that the scale hopper 16 does not generate overscale. That is, the occurrence of overscaling that is directly linked to the stoppage of the operation of the combination weighing device 1 is avoided.
[0066]
Next, when the preliminary combination is not established as a result of the preliminary combination operation, a main combination obtained by the preliminary combination operation from which the preliminary combination is established is selected from a plurality of main combinations obtained in the preceding main combination operation. Such control will be described with reference to FIGS. 11 and 12. FIG. In particular, in the description with reference to FIG. 12, in order to more specifically express the supply / discharge operation of the objects to be weighed X... X, the pool hoppers 15 to 15, the weighing hoppers 16 to 16, and the objects to be weighed X. Are respectively appended with a suffix, and in the following description, a suffix with a suffix is appropriately used.
[0067]
As shown in FIG. 11, when the operation of the combination weighing apparatus 1 is started, in step S51, the feeders 14... 14 are driven to move the objects X to be weighed X to the empty pool hoppers 15. After the supply, the weighing values of these objects to be weighed X... X are input. In this case, since the operation has just started, the pool hopper 15 ₁ ~ 15 ₆ Are all empty and the supplied weighing object X ₁₁ ~ X ₆₁ Is pool hopper 15 ₁ ~ 15 ₆ (See FIG. 5A).
[0068]
In step S52, after the objects to be weighed X ... X are supplied from the pool hoppers 15 to 15 to the weighing hoppers 16 ... 16, the weighed values of these objects to be weighed X ... X are input. Then, in step S53, the objects to be weighed X ... X are supplied from the feeders 14 ... 14 to the empty pool hoppers 15 ... 15. In this case, since the operation has just started, the weighing hopper 16 ₁ ~ 16 ₆ Are all empty and the weighing object X previously supplied ₁₁ ~ X ₆₁ Is the weighing hopper 16 ₁ ~ 16 ₆ While the object X supplied this time is ₁₂ ~ X ₆₂ Is pool hopper 15 ₁ ~ 15 ₆ (See FIGS. 5A and 5B described above).
[0069]
In step S54, a main combination operation is performed on the weighing hoppers 16... 16, and in step S55, it is determined whether or not the main combination operation has resulted in a main combination in which the combined weight falls within an allowable range with respect to the target weight. judge. In FIG. 12A, the target group of the main combination calculation is indicated by the thick chain line of the symbol A.
[0070]
If "YES" is determined in the step S55, a plurality of main combinations which are established in the order of the accuracy with respect to the target weight are stored in the memory 20a in a step S56, and in step S57, the main combination having the highest accuracy among the plurality of the main combinations is selected. I do. In this case, two weighing hoppers 16 ₁ , 16 ₃ That is, the weighing object X ₁₁ , X ₃₁ The highest accuracy is obtained with the combination (see FIG. 12A).
[0071]
In step S58, a preliminary combination calculation is performed for the weighing hoppers 16... 16 not selected as the main combination and the pool hoppers 15... 15 corresponding to the selected weighing hoppers 16. In FIG. 12A, the target group of the preliminary combination calculation is indicated by the thin dashed line B.
[0072]
In step S59, as a result of the preliminary combination calculation, it is determined whether or not a preliminary combination in which the combined weight falls within the allowable range with respect to the target weight is established. If YES is determined, in step S60, the main combination is selected. The weighing objects X... X are discharged from the weighing hoppers 16... 16 and the pool hoppers 15. Are supplied, and the weighed values of the objects to be weighed X... X are input, and the process returns to step S53.
[0073]
On the other hand, if NO is determined in the step S59, it is determined in a step S62 whether or not the next main combination of the accuracy exists. In the case of the target group of the preliminary combination calculation indicated by the thin dashed line B in FIG. 12A, the preliminary combination is not established.
[0074]
If NO is determined in step S62, this means that there is no main combination of the next accuracy. Therefore, the process returns to step S60. On the other hand, if YES is determined, a plurality of data stored in the memory 20a are stored in step S63. After selecting the relevant main combination from the main combinations, the process returns to step S58, and the preliminary combination calculation is performed again. As shown in FIG. 12B, two weighing hoppers 16 in the target group of the main combination ₂ , 16 ₆ That is, the weighing object X ₂₁ , X ₆₁ Is the main combination of the following accuracy, and as a result of the preliminary combination operation based on this, one of the weighing hoppers 16 in the target group of the preliminary combination operation indicated by the thin dashed line B ₄ That is, the weighing object X ₄₁ And one pool hopper 15 ₂ That is, the weighing object X ₂₂ And the preliminary combination is established.
[0075]
That is, in the example of this case, since YES is determined in the next step S59, the process proceeds to step S60, and the weighing hopper 16 selected as the main combination having the highest accuracy in the main combination calculation is performed. ₁ , 16 ₂ To be weighed X from ₁₁ , X ₃₁ Weighing hopper 16 selected as the next main combination of accuracy after canceling the discharge of ₂ , 16 ₆ To be weighed X ₂₁ , X ₆₁ Is discharged, and in step S61, the object X ₂₁ , X ₆₁ Hopper 16 that discharges ₂ , 16 ₆ Pool hopper 15 corresponding to ₂ , 15 ₆ To be weighed X ₂₂ , X ₆₂ Are supplied, these objects X are weighed. ₂₂ , X ₆₂ Enter the weighing value of. Then, the process returns to step S53, and drives the feeders 14, 14 to empty the pool hopper 15 ₂ , 15 ₆ To be weighed X ₂₃ , X ₆₃ Are supplied, these objects X are weighed. ₂₃ , X ₆₃ Enter the weighing value of. As is apparent from the figure, in the next main combination calculation, two weighing hoppers 16 are used. ₂ , 16 ₄ That is, the weighing object X ₂₂ , X ₄₁ Thus, the main combination is established (see FIG. 12C).
[0076]
If NO is determined in the step S55, the object X to be weighed is additionally supplied from the pool hopper 15 corresponding to the preset weighing hopper 16 in a step S64, and then the process returns to the step S54.
[0077]
In this way, a plurality of main combinations are calculated in the main combination calculation, these are stored in the memory 20a in order of precision, and the preliminary combination is not established in the preliminary combination calculation performed based on the highest precision main combination. At times, a preliminary combination operation based on the next main combination of accuracy can be performed. That is, it is possible to select, from the main combinations at the time of the main combination calculation, a main combination that satisfies the preliminary combination at the time of the preliminary combination calculation. Therefore, it is possible to establish the next main combination while maintaining the combination accuracy.
[0078]
Then, as a result of the main combination calculation, when the main combination is not established, the held weighing object X is supplied to the weighing hopper 16 to select the pool hopper 16 in which the main combination is established. This will be described with reference to FIGS.
[0079]
In the flowchart shown in FIG. 13, the control other than step S82 is the same as the control other than step S12 in FIG.
[0080]
That is, if NO is determined in the step S76 or the step S81, the step S82 is executed. Step S82 in this case will be described in detail. As shown in FIG. 14, in step S82A, the pool hopper 15 in which the main combination is established by additionally supplying the held weighing object X to the corresponding weighing hopper 16 is selected. In step S82B, after the object X to be weighed is additionally supplied from the selected pool hopper 15 to the corresponding weighing hopper 16, the weighing value by the weighing hopper 16 is input.
[0081]
Then, after step S82, the process returns to step S75, and the main combination calculation is performed on the weighing hoppers 16.
[0082]
By doing so, even if the main combination is not established as a result of the main combination calculation, the object X to be weighed is additionally supplied from the pool hopper 15 to the weighing hopper 16 so that the main combination is established. This is more effective as a countermeasure when the combination is not established.
[0083]
Although not described, step S32 in FIG. 8 or step S64 in FIG. 11 may be changed to the same control as in step S82.
[0084]
In the above-described embodiment, the supplied objects to be weighed X are weighed by the weight detectors 15a of the pool hoppers 15 and then by the weight detectors 16a of the weighing hoppers 16 and 16 respectively. 16a, the weight detectors 15a... 15a of the pool hoppers 15... 15a are compared with the weight detectors 16a. May be set to low weighing accuracy, or may be changed to a weight detector with low weighing accuracy. As a result, cost reduction and high-speed processing can be performed while maintaining predetermined measurement accuracy.
[0085]
On the other hand, the weighing accuracy of the weight detectors 15a... 15a of the pool hoppers 15. 16a can be omitted. In this case, the weighing values of the weighing objects X... X are transferred from the pool hoppers 15. Accordingly, the weighing operation in the weighing hoppers 16 is omitted, so that the load on the control unit 20 is reduced, and cost reduction and high-speed processing can be performed while maintaining a predetermined weighing accuracy.
[0086]
Further, the combination weighing device 1 according to the embodiment has a type in which the feeders 14..., The pool hoppers 15. It is needless to say that the function and effect of the present invention as described above can be obtained even in the case of the type arranged in a shape.
[0087]
Then, the objects to be weighed X ... X may be discharged from the pool hoppers 15 ... 15 in two directions: the direction of the weighing hoppers 16 ... 16 and the individual chutes 17 ... 17. A booster hopper may be provided below the corresponding hopper so that the objects to be weighed X can be discharged from the weighing hoppers 16 in the two directions of the booster hopper direction and the individual chutes 17. As a result, the number of participating metric values at the time of the combination calculation is reliably increased, so that the combination is established with a higher probability.
[0088]
【The invention's effect】
As described above, according to the present invention, there is provided a combination weighing device capable of forming a combination with a high probability by predicting whether a combination is to be established or not in advance, thereby improving an operation rate. That is, the present invention relates to a combination weighing device that weighs an object to be weighed by a plurality of weighing means, and weighs the object to be weighed to a predetermined target weight based on the measurement result, and is widely used in the technical field of an article weighing device. It is suitable.
[Brief description of the drawings]
FIG. 1 is a side view of a main part of a combination weighing device according to the present embodiment.
FIG. 2 is a block diagram of a control system.
FIG. 3 is a flowchart illustrating an example of control.
FIG. 4 is a flowchart showing step S16 in FIG. 3 in detail.
FIG. 5 is a schematic diagram for explaining a supply / discharge operation of an object to be weighed.
FIG. 6 is also a schematic diagram.
FIG. 7 is also a schematic diagram.
FIG. 8 is a flowchart for explaining another control example.
FIG. 9 is a flowchart showing step S38 in FIG. 8 in detail.
FIG. 10 is a schematic diagram for explaining a supply / discharge operation of an object to be weighed.
FIG. 11 is a flowchart for explaining another control example.
FIG. 12 is a schematic diagram for explaining a supply / discharge operation of an object to be weighed.
FIG. 13 is a flowchart for explaining another control example.
FIG. 14 is a flowchart showing details of step S82 in FIG. 13;
[Explanation of symbols]
1 Combination weighing device
14 Feeder
15 Pool hopper (second hopper)
15a Weight detector (weighing means)
16 Weighing hopper (first hopper)
16a Weight detector (weighing means)
20 control unit (calculation means, preliminary calculation means, supply amount control means, additional supply means, additional supply target hopper selection means)

Claims (5)

A plurality of first hoppers for holding the supplied objects to be weighed, a plurality of second hoppers provided above and corresponding to the respective first hoppers to supply the objects to be weighed to the first hoppers, respectively; A combination weighing device, comprising: a plurality of feeders for respectively supplying objects to be weighed to a second hopper; a plurality of weighing means provided in each of the hoppers; and a calculating means for performing a combined calculation of the weighed values from the weighing means. A combination weighing device, comprising: a preliminary calculation means for performing a pre-combination calculation on a weighing value of a hopper which is not selected when a combination of hoppers is selected by the calculation means. When the combination is not established by the preliminary combination operation by the preliminary operation means and there is an empty second hopper, the supply amount of the object to be weighed to the empty second hopper is determined by the amount by which the preliminary combination operation is established. 2. The combination weighing device according to claim 1, further comprising a supply amount control means for controlling the combination weighing device. 3. The combination weighing according to claim 1, wherein the calculation unit calculates a plurality of combinations by one calculation, and selects the combination in which the preliminary combination is established by the preliminary calculation unit. 4. apparatus. When a combination is not selected by the arithmetic unit, an additional supply unit that additionally supplies the object to be weighed in the second hopper to the first hopper is provided, and the supply amount control unit is configured to supply the object from the feeder to the second hopper. The supply amount of the object to be weighed is controlled so that the added value of the weighed value of the second hopper and the weighed value of the first hopper does not exceed a predetermined value even if the additional supply by the additional supply means is performed. The combination weighing device according to claim 2 or 3, wherein the combination weighing device is used. When a combination is not selected by the calculating means, an additional supply target hopper selecting means is provided for selecting a second hopper in which the combination is established by supplying the held weighing object to the first hopper, 2. The method according to claim 1, wherein the calculation unit performs a combination calculation based on the measured value of the object to be weighed supplied from the second hopper selected by the additional supply target hopper selection unit to the first hopper. 3. Item 5. The combination weighing device according to any one of Items 4.

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