JP3021790B2 - Quantitative setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
More specifically, it relates to a quantitative setting device for introducing only a set amount of powder (such as powder). More specifically, the setting is performed based on a signal from an amount measuring means for detecting an amount (weight, etc.) of the raw material introduced into the container. The present invention relates to a quantitative setting device capable of accurately performing a quantitative setting process of closing a valve so as to obtain a determined quantitative value.

[0002]

2. Description of the Related Art FIG. 4 is a conceptual diagram showing an example of this type of quantitative setting apparatus. In the drawing, reference numeral 1 denotes a container, and 2 denotes a conduit for introducing raw materials into the container 1. Although one conduit is shown here, a plurality of raw materials are prepared when plural raw materials are introduced. Reference numeral 3 denotes a valve provided in the middle of the conduit 2 for introducing the raw material, and a valve for controlling the introduction of the raw material into the container. Reference numeral 4 denotes a flow detecting means for measuring a flow rate of the raw material passing through the conduit 2. Reference numeral 5 denotes a flow detecting means. This is a quantitative setting instrument which calculates the amount of raw material introduced into the container 1 by integrating the flow rate signals of the above and calculates the amount of the raw material introduced into the container 1, and controls the valve 3 to be closed when the integrated calculated value reaches a preset quantitative value.

[0003]

In the conventional quantitative setting device having such a configuration, the signal applied to the quantitative setting instrument 5 assumes the signal from the flow rate detecting means, and the container 1
It did not assume a signal from a quantity measuring sensor such as a load cell that directly measures the quantity of raw materials introduced into the apparatus. When performing quantitative setting processing by inputting a signal from a quantity measurement sensor such as a load cell, an abnormality such as a disturbance signal due to an impact that may be output from the quantity measurement sensor or an overhang of the weighing value Since a signal is output, it cannot be put to practical use unless measures are taken to prevent the influence of these disturbances and the like. The present invention has been made in view of such a point, and uses an amount measuring means for measuring an amount (weight or the like) of a raw material introduced into a container, and a measurement signal can be read from the amount measuring means ( Signal not affected by disturbances)
Or a signal indicating whether the reading is impossible (a signal affected by disturbance or the like) is output, and a quantitative setting device capable of performing an accurate quantitative setting process even if the reading impossible state continues. Aim.

[0004]

According to the present invention for achieving the above object, the amount (batch amount) of the material to be introduced into the container is set in advance, and the amount of the material to be supplied to the container is set according to the deviation from the weighing data. A device equipped with a quantitative setting instrument for controlling the amount of introduction, while detecting the amount of material introduced into the container,
An amount measuring means for outputting a signal indicating whether or not the signal can be read, a change amount calculating means for calculating a change amount between the previous weighing value and the current weighing value when the read enable / disable signal indicates that the signal is readable; When the enable / disable signal indicates that reading is impossible, the weighing value predicting means for predicting the current weighing value from the previous weighing value and the previous change amount obtained by the change amount calculating means, and the weighing value or weighing value from the weighing means. Controlling the introduction of raw materials into the container based on the weighed value from the value predicting means,
Based on the weighing value from
The calculated amount introduced into the container has not reached the batch amount.
Transfer to the container before the next measurement scan.
If it is determined that the input volume does not reach the batch volume,
Time calculation means for calculating the time to reach
To the container based on the time calculated by the time calculation means
And a quantitative setting processing means for controlling a supply stop of the material to be supplied .

[0005]

When the read enable / disable signal output from the quantity measuring means indicates that reading is possible, the quantitative setting processing means reaches the batch amount based on the weighing value signal output from the quantity measuring means. The normal quantitative setting process is performed as described above. Further, the change amount calculating means calculates a change amount of the measured value based on the previous measured value and the current measured value. The weighing value predicting unit predicts the current weighing value from the previous weighing value and the previous change amount obtained by the change amount calculating unit, when the read enable / disable signal output from the amount measuring unit indicates that reading is impossible, This is given to the quantitative setting processing means. At this time, the quantitative setting processing means performs quantitative setting processing based on the weighing value signal from the weighing value predicting means so that it reaches the batch amount.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration block diagram showing one embodiment of the present invention. In the figure, the same components as those of the device of FIG. 4 are denoted by the same reference numerals. Numeral 6 is an amount measuring means for detecting the amount of the raw material introduced into the container 1 and outputting a signal indicating whether the measured value is readable or not.
The quantity measuring means 6 uses, for example, a load cell, outputs the measured value as a BCD code signal, and simultaneously outputs a signal indicating whether the measured value data represented by the BCD code is readable / impossible. It is configured to be. In the quantitative setting meter 5, reference numeral 7 denotes switch means driven by a read enable / disable signal output from the quantity measuring means 6, and only when the read enable / disable signal indicates readable, is the weighing value data from the quantity measuring means 6. Is adopted to bypass (exclude) when it is impossible. Numeral 8 denotes a change amount calculating means for inputting the weighing value data from the amount measuring means 6 applied via the switch means 7 and calculating the change amount from the previous weighing value and the current weighing value.
Numeral 9 is a weighing value predicting means for inputting weighing value data from the amount measuring means 6 applied via the switch means 7, and if the read enable / disable signal output from the amount measuring means 6 indicates that reading is impossible, The present embodiment is configured to perform a calculation for predicting the current weighed value from the weighed value and the previous change amount calculated by the change amount calculating means 8.

Reference numeral 10 denotes quantitative setting processing means, which inputs weighing value data from the quantity measuring means 6 applied via the switch means 7 and inputs predicted weighing value data calculated by the weighing value predicting means 9. are doing. The quantitative setting processing means 10 performs quantitative setting processing based on the weighing value data from the quantity measuring means 6 when the read enable / disable signal from the quantity measuring means 6 indicates that the reading is possible, and indicates that the reading is impossible. Is configured to perform a quantitative setting process (control of introducing a fixed amount of raw materials into a container) based on the measured value data from the measured value predicting means 9. Reference numeral 12 denotes an introduction amount setting means for setting an introduction amount (batch amount) to the container 1. In the quantitative setting processing means 10, reference numeral 11 denotes time calculating means, and the amount introduced into the container 1 calculated based on the weighing data from the weighing means 6 or the weighing data from the weighing value predicting means 9 corresponds to the batch amount If it is not reached and it is determined that the amount introduced into the container 1 reaches the batch amount by the next measurement scan, the time from the time of the current measurement scan to the time when the batch amount is reached is calculated. Has become. 13
Is a timer which is driven based on the time calculated by the time calculating means 11 and drives the valve 3 through the valve driving means 14 to close it.

[0008] The operation of the device configured as described above will now be described.
I will tell. FIG. 2 is a flowchart showing an example of the operation;
3 is a time chart. First, valve 3 is opened
Being driven, material is introduced into vessel 1 via line 2
Have been. Thereby, the material introduced into the container 1 is
The amount increases almost linearly. Materials introduced into the container
The amount (weight etc.) of the material is measured by the amount measuring means 6
It is measured at a scan cycle t. At this time, the quantity measuring means 6
Indicates that reading is possible / not possible, as shown in FIG.
Signal is output. In the quantitative setting instrument 5,
The switch means 7 reads / disables reading from the quantity measuring means 6.
If the number indicates that reading is possible,
Uses output weighing value data (BCD code signal)
Then, the measured value data is used to calculate the change amount
To the means 9 and the quantitative setting processing means 10. Unreadable
Indicates that the weighing data is bypassed.
Not adopted (steps 1 and 2). Change amount calculation means8
Is the current measured value data adopted by the switch means 7.
Input in the previous measurement scan with PV1
Using the weighing value data PV2, the change amount ΔPV (= P
V2-PV1) is calculated (step 3). Quantitative setting processing
The processing means 10 uses the adopted measurement value data PV1,
The weighing value data is the set amount of the introduced amount (set value of the batch amount) S
V, the valve 3 via the valve driving means 14
Is output. A series of such operations
Is repeatedly performed in a fixed cycle (Step 4,
5).

In such a series of operations, the quantity measuring means 6
If the read enable / disable signal indicates that the reading is impossible, the weighing value predicting means 9 outputs the previous weighing value data PV
2 and the previous change amount ΔPV calculated by the change amount calculating means 8
Is used to predict the current measurement value data PV1p by calculation (step 6). PV1p = PV2 + ΔPV · n (1) where n is the number of measurement scan cycles within the time Tno during which the read enable / disable signal indicates that the read is impossible, and the current weighing value data PV1p predicted by the calculation.
Is applied to the quantitative setting processing means 10, and the quantitative setting processing means 10 performs quantitative setting processing based on the measured value data. That is, if the measured value data has reached the batch amount, a control signal for closing the valve 3 is output.

In step 4, the quantitative setting processing means 1
If the input weighing value data (a signal from the quantity measuring means or a signal from the weighing value predicting means) does not reach the introduction quantity set value (batch quantity set value) SV, the quantitative setting processing means 1
0 determines whether the weighing value data reaches the batch amount SV until the next measurement scan (step 7). The determination here is, for example, the measurement value data PV1 (or PV1
p) and the batch amount SV (SV-PV1) is ΔP
If it is smaller than V, it is determined that way. When it is determined that the weighing value data reaches the batch amount SV, the time calculation means 11 calculates the relationship between the deviation (SV = PV1) and ΔPV,
The time T required to reach the batch amount SV is calculated, and the calculated time T is set in the timer 13. This time T is calculated by, for example, equation (2). T = {(SV-PV1) / ΔPV} · t (2) The timer 13 controls the valve 3 via the valve driving means 14 to close the valve 3 when the time T has elapsed since the timer was set.

If it is determined in step 7 that the weighing value data does not reach the batch amount SV, the quantitative setting processing means 10 determines the deviation (SV-PV1) between the weighing value data PV1 and the batch amount SV. Accordingly, the opening degree of the valve 3 is calculated and output to the valve driving means 14 to control the opening degree of the valve 3. In the embodiment of FIG. 1, a case is shown in which the measurement value data and the read enable / disable signal are applied to the quantitative setting instrument 5 through separate signal lines from the measurement means 6, but the read enable / disable signal is applied. The unacceptable signal may be configured to use, for example, one bit of the weighing value data and to apply the data together with the data to the quantitative setting meter 5. FIG.
In the embodiment, the time calculating means 11 is provided in the quantitative setting processing means 10, and the steps 8 and 9 are performed in the flowchart of FIG.
Are executed, but these may be omitted if the measurement scan cycle can be shortened or if some error is allowed.

[0012]

As described in detail above, according to the present invention, even if the weighing data from the quantity measuring means 6 is rejected due to various disturbance signals or the like, it is not affected at all. A device capable of performing accurate quantitative setting control can be realized.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an example of an operation.

FIG. 3 is a time chart illustrating an example of an operation.

FIG. 4 is a conceptual diagram illustrating an example of a conventional quantitative setting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Pipeline 3 Valve 5 Quantitative setting meter 6 Quantity measuring means 7 Switch means 8 Change amount calculating means 9 Weighing value predicting means 10 Quantitative setting processing means 11 Time calculating means 12 Introducing amount setting means 13 Timer 14 Valve driving means

Claims (1)

(57) [Claims] An apparatus having a fixed quantity setting instrument in which an amount (batch amount) of a material to be introduced into a container is set in advance and the amount introduced into the container is controlled according to a deviation from weighing data. An amount measuring means for detecting the amount of the material introduced into the container and outputting a signal indicating whether or not the signal can be read; and when the read / not possible signal indicates that the signal can be read, the previous weighing value and the current weighing value. A change amount calculating means for calculating a change amount between the weighing value and a weighing value for predicting a current weighing value from the previous weighing value and the previous change amount obtained by the change amount calculating means when the read enable / disable signal indicates that reading is impossible. value prediction means, controlling the introduction of the raw materials to the container based on the metric values from the metric or metric value prediction unit from the quantity measuring means co
The weighing value from the quantity measurement means or the weighing value prediction means
Batch quantity calculated based on the weight of
Volume has not been reached and the next measurement scan
It is determined that the amount introduced into the container does not reach the batch amount
Calculate the time to reach the batch volume
Means based on the time calculated by the time calculating means.
And a quantitative setting processing means for controlling a supply stop of the material to be introduced into the container .