JPH03142326A - Weighing instrument - Google Patents

Abstract

PURPOSE:To shorten the time of each operation and to improve the working efficiency of combination weighing by providing weighing machines, a weighed value storage means, a target weight setting means, a subtracting means, a polarity deciding means, a hopper control means, etc. CONSTITUTION:Weighing machines 21 to 2n weigh a material to be weighed, and weighed values from weighing machines 21 to 2n are stored in a weighed value storage means 4 correspondingly to hoppers 3 where the material to be weighed is stored. A target weight setting means 9 sets a target weight, and a subtracting means 6 successively subtracts weighed values stored in the means 4 from the target weight set by the means 9. A polarity deciding means 7 discriminates whether the subtraction result of the subtracting means 6 is 0 or is within an allowable value or not; and if it is 0 or is within the allowable value, a stop signal to stop the successive subtraction of weighed values in the subtracting means 6 is outputted. When the stop signal from the means 7 is outputted, a hopper control means 8 discharges the material to be weighed which is stored in hoppers corresponding to weighed values related to subtraction from the target weight. Thus, the combination of only one, two, or three hoppers is obtained to considerably reduce the arithmetic processing.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a weighing device that brings objects to be weighed whose unit weights vary to a target weight or a value close to it.

<Prior art> Conventionally, when measuring objects with varying unit weights as described above to a target weight of 1ffi, an error inevitably occurs between the weight and the target weight, so various techniques have been used to minimize this error. A weighing device is being considered.

In a conventional weighing device of this type, objects to be weighed are sequentially supplied to a plurality of weighing hoppers a1 to an as shown in FIG. Each object to be weighed stored in the hopper is weighed. Then, the measured values of each of the scales bt to bn are input to the combination setting circuit C, and the combined weight for every combination (i.e., 2 combinations) is calculated, and among all the combined weights obtained by the calculation, , select the combination of weighing hoppers that exceeds the target weight and has the smallest difference from the target weight (for example, Japanese Patent Application Laid-Open No. 57-94617, Japanese Patent Application Laid-Open No. 57-57)
No. 149923). The objects to be weighed in the plurality of weighing hoppers in the thus selected combination are discharged into a collecting chute or the like and collected together.

<Problems to be Solved by the Present Invention> However, in the conventional meter@device of this type, each measurement value is added in all combinations, all are stored, and all the addition results of these combinations are stored. Since it was compared with the target weight using a comparator, (a) All combination additions are calculated, and all combination addition results are compared with the target weight and the closest one is selected, so - one combination The calculation process for selection becomes enormous and takes a lot of time. Moreover, in this type of weighing device, combinations must be performed one after another at high speed, so a large amount of time is spent on each combination calculation.
The stacking results in a huge waste of time and significantly reduces the efficiency of the combination.

(b) In order to select the one closest to the target weight from all combinations, for example, only - hoppers or 2g
Even if there is a weight that is relatively close to the target weight due to a combination of only hoppers, the combination of, for example, three or four hoppers closest to the target weight will be selected, so the number of combinations will inevitably increase. .

However, the hopper shutter l114 selected for the combination
11 opens and closes, the object to be weighed is discharged, and a new object to be weighed is supplied to the hopper. Therefore, the greater the number of combinations, the more severe the damage to the hopper's shutter I1m, etc., and the shorter the lifespan.

Further, since it takes time to discharge the object to be weighed from the hopper and then fill it, the greater the number of combinations, the fewer the number of hoppers that can participate in selecting the next combination, making it difficult to obtain a good combination.

In addition, measurement errors of the measuring instrument itself are unavoidable, so
The greater the number of combinations, the more measurement errors will accumulate.

There were problems such as.

An object of the present invention is to provide a measuring device that solves these problems.

<Means for solving the above-mentioned problems> In order to solve the above-mentioned problems, the weighing device of the present invention includes: a plurality of measuring instruments for weighing objects to be weighed; and a measurement value from each of the measuring instruments to be measured. a first target weight setting means for setting II!All as a first target weight; and a first target weight setting means for setting II!All as a first target weight; target weight updating means for updating a value obtained by subtracting a measured value corresponding to at least one hopper stored in a storage means as a second target weight instead of the first 011A@ amount; and the measured value storage means subtraction means for sequentially subtracting the measured values stored in the first target weight from the first target weight set in the first target weight setting means or the second target weight updated by the target 141 updating means; polarity determining means for determining whether the subtraction result of the means is zero or negative, and outputting an abort signal for aborting the sequential subtraction of the subtracting means based on the measured value if the result is zero; and the first target weight. a first upper limit tolerance setting means for setting a first upper limit tolerance i that exceeds the first upper tolerance value, and a second upper limit tolerance setting means for setting a second upper tolerance value that further exceeds the first upper tolerance value; When the subtraction result is negative, the subtraction result is compared with the first upper limit tolerance, and if it is within the first upper limit tolerance II, the subtraction means sequentially performs subtraction using the measured value. a first comparison means that outputs a truncation signal to cut and outputs an excess signal when the first tolerance value is exceeded; and upon receiving the excess signal from the first comparison means, the subtraction result is and the second upper limit allowable value, and if it is within the second upper limit allowable value, a predetermined eye I
By the f4 weight update stage number, the subtraction result closest to the first upper limit tolerance value is updated and stored in accordance with the sequential subtraction, and the target! a second comparing means that outputs an abort signal for aborting the sequential subtraction of the subtracting means based on the measured value when the subtraction up to the number of updating steps of the quantity is completed; and the polarity determining means, the first comparing means, the second When the discontinuation signal from the comparison means is output, the hopper corresponding to the weighed value that participated in the subtraction in the result of subtraction from the first weight m, or the updated memory at the end of the final stage number of target 11 updates. and hopper control means for discharging the object to be weighed in the hopper corresponding to the weighed value that participated in the subtraction within the second upper limit allowable value and the subtraction in the target weight update.

Examples of the present invention> An embodiment of the present invention shown in the drawings will be described below.

In FIG. 2, reference numerals 11 to 1n are measuring hoppers, each of which is provided with measuring devices 21 to 2n.

31a in 3s b to 3n aq 3n b are memory hoppers that temporarily store objects to be weighed that have been weighed by the scales 21 to 2n, respectively.

The measured values of the objects to be weighed are stored in the measured value storage means 4 corresponding to the memory hoppers 31aq 3t b to 3n a and 3n b.

5 is a measured value selection means, and the measured value storage means 4
Each weighing value stored in the memory hopper is selectively read out in correspondence with the memory hopper.

Reference numeral 6 denotes a subtraction means for subtracting the measured value selected by the measured value selection means 5 and the first target weight or the updated second and third target weights which are the output of the target value setting means 9. .

7 is a polarity for determining whether the output of the subtraction means is 0, positive or negative, and in the case of 0, outputting an abort signal that aborts the sequential subtraction of the subtractor a6 based on the measured value; It is a means of judgment.

8 is the polarity determining means 7 and a first comparing means 1 to be described later.
21. When the discontinuation signal from the second comparing means 122 is output, the hopper corresponding to the measured value that participated in the subtraction in the result of subtraction from the first filW amount, or the final stage number of target weight update, which will be described later, is terminated. Update the object to be weighed in the hopper corresponding to the weighed value that participated in the subtraction within the second tolerance value and the reduction in the target weight update at the time,
This is a hopper control means for discharging to collect them all together.

The target value setting means 9 receives the outputs of the first target value setting means 91, the target value storage means 92, the first target value setting means 91, the target value updating means 42, and the target value storage means 94, and sets the target value. and target value selection means 93 for selecting.

First, if an appropriate combined measurement value within the first upper limit tolerance (19) cannot be obtained using the first target value (for example, 200 (l) of the first target value setting means 91, If the determination means 7 and the first comparison means 121 cannot obtain an appropriate value, the target value updating means 92 is used to update the target value.
As a result, the output value of the subtraction means 6 obtained by subtracting the weight value of one hopper from the first target value (200 g) is stored in the target value storage means 94, and the target value selection means 93
and set this as the second target weight. Then, the weighing value of each hopper is sequentially subtracted from this second target weight value (second stage subtraction). If an appropriate combined weighing value is still not obtained, further subtracting from the second target 1ffi is performed. The value obtained by subtracting the weighing value of one hopper is updated and stored in the target value storage device #l 194 as the third target weight value, and the weighing value of each hopper is calculated from the third target II by the subtraction means 6. are sequentially subtracted (third stage subtraction).

10 is the first value for determining the tolerance range of the desired measurement value.
The upper limit permissible value setting means is set to, for example, a value of -0.5% (-1 (J)) of the desired measured value.

11 is a value exceeding the first upper limit allowable value (-1(]) of the first upper limit allowable value setting means 10, for example, a value of -4% (
-80) is the second upper limit tolerance setting means.

When the subtraction result of the subtraction means 6 is negative, the comparison means 12 compares the subtraction result with the first upper limit tolerance,
If the value is within the first upper limit tolerance, outputting an abort signal that aborts the sequential subtraction of the subtractor 6 based on the measured value;
a first comparison means 121 that outputs an excess signal to a second comparison means 122 when the first tolerance is exceeded; and upon receiving the excess signal from the first comparison means 121, The subtraction result is compared with the second upper limit allowable value, and if it is within the second upper limit allowable value, the above-mentioned sequential steps are performed by a predetermined number of target weight update steps (for example, the end of the third step subtraction). According to the subtraction, the subtraction result closest to the first upper limit tolerance value is updated and stored, and the target! a second comparing means 1 that outputs an abort signal for aborting the sequential subtraction of the subtracting means 6 based on the measured value when the subtraction up to the number of update steps of the quantity is completed;
22, and from 41I.

With the above configuration, multiple scales are used in parallel to store the measured values, and the object to be weighed is equal to the desired set value, or larger than the set value and close to the set value. A predetermined weight (first target weight 1
When there is a memory hopper with a residual value of 0 indicating a negative value, and when there is a memory hopper whose residual value is 0 or First target weight (-0,5% of 2001 (-1
If the cl falls within the allowable value (first upper limit allowable value), the subtraction is immediately stopped, the corresponding memory hopper is released, the object to be weighed is discharged, and the object to be weighed is transported to the next process. do. That is, the object to be weighed in only one memory hopper is carried out.

If, even after performing the first subtraction for all memory hoppers, there is no memory hopper that falls within O or the first upper limit tolerance, the second upper tolerance (-8(1)) The weighing value of the memory hopper with a negative value close to the first upper tolerance value (-19) and the corresponding memory hopper are stored in the second comparing means 122 .

Next, the result of subtracting the weight value of one randomly selected memory hopper in the first stage from the first target weight is updated as the second target value, and A second stage of subtraction is performed in which the measured value of the memory hopper is sequentially subtracted from the second target value. Then, if the value falls within O or the first upper limit allowable value as above, the subtraction is immediately stopped one after another, and the memory hopper that participated in the corresponding subtraction and the selection that participated in the subtraction for the second target weight The stored memory hopper is released, the object to be weighed is discharged, and the object to be weighed is transported to the next process.

When subtracting the weighing values of all hoppers in this second stage, if there is no memory hopper that indicates O or within the first upper limit tolerance, and there is a value within the second upper tolerance value. compares the value closest to the first upper limit tolerance among the second upper limit tolerances stored so far with the current value in the second upper Wii, and sets the value closer to the first upper limit tolerance. When the time is near, the memory is updated with the current value, and the corresponding memory hopper is updated and stored.

If the target weight is updated in advance up to the third target weight and set before the third stage subtraction, the subtraction will be terminated at the end of the third stage subtraction, and the first upper limit tolerance at this time will be The memory hopper of the updated value stored between the value and the second upper limit allowable value and the memory hopper that participated in the subtraction when updating the target weight are released, and the object to be weighed is discharged.

In addition, even if the third stage subtraction is performed, if there is no memory hopper within the 0 or the first and second upper limit tolerance values, the target weight is further updated to the fourth target weight, and the fourth stage , and in this case as well, perform the subtraction up to a predetermined number of stages,
Every time a subtraction is performed, if there is a memory hopper that indicates O or within the first upper limit tolerance, it is discharged, and if there is no memory hopper that is within the second upper tolerance value, the weighing value of the memory hopper that is stored is ejected. The weighing value of the memory hopper closest to the first upper limit tolerance value is stored, and the memory hopper is finally released at a predetermined number of stages to obtain the target object to be weighed. (See Figure 3).

As a specific example, if the first target value is 200C1, 1
Assuming that the weighing memory values of the six memory hoppers are as shown in the table below, (a) the first combination is the hopper ■ in order from the setting value of 2009 (the numbers in circles indicate between hoppers; the same applies below) Subtract the weight value of hopper [phase] from the weight value of , but in this case, hopper ■ is 201g, so 200-201=-IQ・
...-0.5% (within -10, so the subtraction operation is terminated at hopper ■, hopper ■ is discharged, and the first combination is completed with only one hopper.

(b) Next, move on to the second combination.

In this case, the new weighing values are output from the discharged hopper ■ one after another, so the hopper O-[phase] is continued and the first 4! Subtract from weight.

In this case, since there is no value within 0 to -4% (-80), the process proceeds to the second stage of subtraction.

In other words, select one hopper ■ and set the first target f
! Subtracting from the amount, 200g - ■7og = 13
09, 130g is updated as the second target weight.

In this case, hopper ■ is excluded and hopper ■ to hopper [phase] are subtracted, but when 132g of hopper ■ is subtracted, it is 130 (1 - 132 (! = -29, -0.5%
Since it exceeds and is within 4%, remember this. Then, if the subtraction is further performed up to the hopper [phase], and further sequentially up to a predetermined predetermined number, for example, the second stage number, as a result of subtraction from the second target weight, -29 is the highest first upper limit. Since it is close to the allowable value, this is memorized, and hopper ■ and hopper ■ are selected as a combination, and hopper ■ and hopper ■ are discharged.

(C) In the third combination, a new weighing value is already prepared in the hopper ■, so the first target weight is 20% again.
Hopper ■ to hopper ■ are sequentially subtracted from 09, but in this case, hopper ■ and hopper ■ are removed because they have been discharged.

Hopper 2089 is 200g-208(]=-8g, which is within 14%, but exceeds -0.5%, so this is memorized and the subtraction proceeds to the second stage.

In other words, with 2009 - hopper ■689 = 132g as the second target value, hopper ■ from hopper ■ to hopper ■
and Hopper ■ and subtract it, and since there is nothing that falls within 0 to -0.5%, next 2009 - Hopper ■85Q = 115
9 is set as the third target value, and subtraction is performed sequentially in the same manner.

Similarly, 200g hopper (2) to hopper (2) are carried out, and hopper (2) to (excluding those after discharge) are subtracted for each.

If there is no 0 to -0.5%, move to the third stage, 2009-hopper ■68j) = 1329 then 13
2g-hopper■85! ] = About 47g, hopper■
~ Subtract hopper ■ (excluding those after discharge). However, since 479 - hopper ■479 = O, hopper ■,
Hopper■Discharge the hopper■. Then, the process moves to the fourth combination calculation.

<Effects of the Present Invention> As described above, in the present invention, when obtaining a target measuring instrument by subtraction, if only one hopper falls within the first upper limit tolerance, that one hopper is If the purpose of the combination is slowed down and the purpose is not achieved by discharging the
Update to the second target weight and perform the second subtraction, or subtract up to the predetermined number of stages, and if it cannot be obtained with only one hopper, only two hoppers, and if it cannot be obtained with only two hoppers, then Since the combinations are selected as three, the purpose of the combination can always be achieved with the minimum number of combinations.

Therefore, in the present invention, unlike the conventional weighing device described above, there is no need to weigh all the combinations of hoppers and compare the weight of all the combinations with 0 bar weights. Since the combinations are obtained by simply redirecting and the calculations are immediately terminated, the calculation process can be greatly reduced, and the time required for calculations can be greatly reduced. , Due to this effect of shortening the calculation time for each calculation, the work efficiency of matching weighing can be significantly improved.

Furthermore, as explained above, since the minimum number of combinations is always used, the life of the hopper opening/closing mechanism is extended, and deterioration in accuracy due to accumulation of measurement errors of the measuring instrument is also improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing a combination selection device of a conventional combination device, Fig. 2 is a functional block diagram, and Fig. 3 is a predetermined lf
Subtraction method to obtain f1 target and first, second,
It is a diagram showing the relationship with L@tolerable value, etc. 11~1n...Measuring hopper, 21~2n...
...Measuring instrument, 31a s 3t I, ~3n a N
3n b -=memory unit, 4...Measurement value storage means, 5...Measurement value selection means, 7...
...Polarity determination means, 8...Hopper control means, 9
...Target weight setting means, 91...1st
target amount ffl setting means, 92... target weight updating means, 93... target weight selection means, 94...
...Target weight storage means, 10...First upper limit allowable value setting means, 11...Second upper limit allowable value setting means, 12...Comparing means , 121...
...First comparison means, 122...Second comparison means.

Claims (1)

[Scope of Claims] A plurality of measuring instruments for weighing objects to be weighed, a measured value storage means for storing measured values from each of the measuring instruments in association with each hopper in which the objects to be weighed are stored, and a goal. first target weight setting means for setting a weight as a first target weight; and setting a value obtained by subtracting a weight value corresponding to at least one hopper stored in the weight value storage means from the target weight as a second target weight. A target weight updating means updates the weight instead of the first target weight, and a first target weight set in the first target weight setting means uses the measured value stored in the measured value storage means. Alternatively, subtracting means sequentially subtracts from the second target weight updated by the target weight updating means, and determining whether the subtraction result of the subtracting means is zero or negative, and if it is zero, the weight is polarity determination means for outputting an abort signal for terminating the sequential subtraction of the subtraction means based on the value; first upper limit tolerance setting means for setting a first upper tolerance value that exceeds the first target weight; a second upper tolerance value setting means for setting a second upper tolerance value that is further higher than the first upper tolerance value, and when the subtraction result is negative, comparing the subtraction result with the first upper tolerance value; If the measured value is within the first upper limit tolerance value, an abort signal is output to terminate the sequential subtraction of the subtraction means by the measured value, and if it exceeds the first tolerance value, an excess signal is output. a first comparison means for outputting, and upon receiving the excess signal from the first comparison means, compares the subtraction result with the second upper limit allowable value and determines a value within the second upper limit allowable value; In this case, the first
a second comparison means that updates and stores a subtraction result closer to the upper limit allowable value, and outputs an abort signal that aborts the sequential subtraction of the subtraction means based on the measured value when the subtraction up to the target weight update stage number is completed; When the abort signal from the polarity determining means, the first comparing means, and the second comparing means is output, a hopper corresponding to the measured value that participated in the subtraction in the subtraction result from the first target weight; Alternatively, the object to be weighed in the hopper corresponding to the subtraction within the updated and stored second upper limit allowable value at the end of the final stage of target weight update and the weighed value that participated in the subtraction in the target weight update is discharged. hopper control means.