JP2003130718A - Metering control method for bulk cargo by metering apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metering control method in which an appropriate rough measured value according to the magnitude of a metering set value is selected irrespective of an operator's experience and by which the metering operation of a bulk cargo is performed quickly and precisely. SOLUTION: This metering apparatus composes a metering valve for a cargo storage container which is opened and closed by the operation of an actuator, a metering hopper which is supported by a load meter so as to be arranged in the lower part of the metering valve and a control board which sends a control command to the actuator based on a detection value of the load meter. When the metering set value is input to the control board, the appropriate roughly metered value according to the magnitude of the metering set value is selected based on data on an actual indiscrete value so as to be input automatically. When a metering start switch is turned on, the bulk cargo is metered roughly based on the proper appropriate roughly metered value, and the bulk cargo is metered fine so as to become the metering set value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weighing control method for a bulk load such as cement or aggregate handled in a batcher plant by a weighing device.

[0002]

2. Description of the Related Art For example, in the case of ready-mixed concrete, the mixing ratio of cement, aggregate, water, etc. is selected depending on the workability at the time of placing concrete and the concrete strength required by the structure. Accurate weighing is required to accurately set.

In a batcher plant, as a measuring device for measuring bulk goods such as cement and aggregate, a raw material 1 such as cement, which is bulk goods, is stored as shown in the outline of an example in FIG. It is supported by a metering valve (gate) 4 equipped with a discharge port at the lower end of a storage bin 2 as a bulk storage container which is opened and closed by the operation of an actuator 3 such as a fluid pressure cylinder, and a load cell 5 as a load meter. In this way, the weighing hopper 6 arranged below the weighing valve 4 and the actuator 3 based on the value detected by the load cell 5 so that the rough weighing is performed and then the fine weighing is performed to finally reach the weighing set value. Control panel 7 for sending control commands to
There is a configuration having and. Reference numeral 8 denotes a discharge valve of the weighing hopper 6.

When the raw material 1 is weighed using the above weighing device, as shown in an example in FIG. 5, the weighing set value (target weight) A is input to the control panel 7 and the rough weighing value (weighing set value) is input. Set value of how many kg before A to stop the rough measurement) B
The metering start switch is turned on after selecting and inputting according to the magnitude of the metering set value A. This allows
When the actuator 3 is operated by the command from the control panel 7 and the metering valve 4 is opened, the raw material 1 in the storage bin 2
Is dropped into the weighing hopper 6 at once and discharged, and when the rough weighing value (weighing set value-weighing value) based on the detection value of the load cell 5 reaches the above-set coarse weighing value B, control is performed. The metering valve 4 is once closed by a command sent from the panel 7 to the actuator 3, and then the metering valve 4 is opened / closed in small steps at a required JOG time (opening / closing time), and the raw material 1 is discharged in a small amount. Weighing is performed, and the detected value of the load cell 5 is a fine measurement value (set value of how many kg before the measurement set value A the measurement valve 4 is fully closed: fine measurement cut value) C
At this point, the metering valve 4 is completely closed and the metering ends. The fine measurement value C differs depending on the type of the raw material 1, and is set in consideration of the amount of the raw material 1 which still falls after the metering valve 4 is fully closed.

In the weighing operation by the above-mentioned weighing device, the smaller the coarse weighing value B (the higher the coarse weighing rate) is, the shorter the entire weighing time can be. However, when the weighing set value A is small. Since the measurement error (mainly over-measurement) tends to occur when the coarse measurement value B is set small, the size of the coarse measurement value B is usually selected according to the size of the measurement set value A.

[0006]

However, it is largely due to the experience of the operator that the measurement setting value A is divided into large and small, and it is not possible for anyone to easily set an appropriate rough measurement value B. Absent.

By the way, without dividing into coarse measurement and fine measurement,
There is also a method of performing measurement by changing the closing timing of the metering valve 4 according to the magnitude of the metering set value based on the detected value of the load cell 5, but in this method, the metering hopper 6 is arranged below the metering valve 4. The load due to the drop impact of the raw material 1 has a great influence on the detection value of the load cell 5,
Since the set value for correcting the influence cannot be changed linearly, there is a problem that a measurement error is more likely to occur.

Therefore, according to the present invention, it is possible to quickly and accurately perform the weighing work of bulk goods by selecting an appropriate rough weighing value according to the magnitude of the weighing set value regardless of the experience of the operator. Is what you are trying to do.

[0009]

According to the present invention, in order to solve the above-mentioned problems, a metering valve at a discharge port of a bulk storage container is opened by a command from a control panel to discharge a bulk load. Allow the bulk load to be received by the weighing hopper supported by the load cell, perform the rough weighing based on the detection value of the load cell until the rough weighing value is reached, and then open and close the weighing valve by the command from the control panel. In a weighing control method for bulk goods by a weighing device that is configured to perform fine weighing, a coarse weighing value of a plurality of stages is set in advance in the control panel, and the weighing setting value is input,
According to the size of the weighing set value, an appropriate rough weighing value is selected from the plurality of rough weighing values based on the actual weighing value data, and the rough weighing is performed until the selected rough weighing value is reached. After that, the metering valve is opened / closed at the opening / closing time according to the above-mentioned rough measurement value to perform fine measurement, and various measurement settings are set in advance as actual measurement value data for selecting an appropriate rough measurement value. Based on the relationship between the value and the actual measured value measured based on a certain rough measured value, find the boundary between the range where a stable measured set value is obtained and the range where the coarse measured value must be changed. A weighing control method for bulk goods by a weighing device to be stored.

When the measurement set value is input and set in the control panel,
By collating the measured set value with the actual measured value data, an appropriate rough measured value is selected and automatically input and set, so that the measuring work can be performed quickly and accurately.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

The weighing control method for bulk goods according to the present invention is carried out by using the weighing device shown in FIG. 4, and is equipped at the lower end discharge port of the storage bin 2 as a bulk storage container so as to be opened and closed by the operation of the actuator 3. The measuring valve 4 and the weighing hopper 6 arranged below the measuring valve 4 so as to be supported by the load cell 5 as a load meter, and after the rough weighing, the fine weighing is performed to finally set the weighing. The above load cell 4
In a weighing device comprising a control panel 7 for sending a control command to the actuator 3 based on the detected value of the above, as shown in the flow of FIG. B ₁ , B ₂ ) are set in advance, and the measurement set value A
When is input, the appropriate coarse measurement value B ₁ or B ₂ is selected from the two-stage coarse measurement values B ₁ and B ₂ based on the actual measurement value data according to the magnitude of the measurement setting value A. When the JOG time F ₁ or F ₂ corresponding to the rough weighing value is selected and automatically input and set, and the weighing start switch is turned on, automatic weighing is performed until the appropriate rough weighing value B ₁ or B ₂ is reached. After making a rough measurement, make a fine measurement.

The actual measurement value data for selecting the appropriate rough measurement value B ₁ or B ₂ is based on the relationship between various measurement setting values and the actual measurement value measured at a constant rough measurement value in advance. In addition, a tendency value graph is used, in which the boundary between the range where a stable weight value is obtained and the range where the rough weight value must be changed is obtained.

The actual measured value data will be described in detail below.
First, as shown in an example in FIG. 2, from the relationship between a large number of weighing set values at a fixed rough weighing value and an error of the actual weighing value actually measured by those values, the weighing setting value A is large to small. The regression curve X of the actual measurement value when the value changes to is obtained by the least squares method, and the regression curve X further provides a range E _{1 in} which the measurement can be performed according to the measurement set value with a constant coarse measurement value, and the rough measurement based on the measurement set value. The boundary D with the range E _{2 in} which the value has to be changed is obtained from the point where the slope of the regression curve X changes rapidly. The error of the actual measurement value may be obtained as a quantity or a rate.

Therefore, the measured set value A is in the range E of FIG.
₁When it is within the range, a small coarse measurement value B as shown in FIG.₁
And when opening and closing the metering valve 4 during fine weighing.
A large value F for the JOG time that is between₁Selected and weighed
Fixed value A is range E in FIG._TwoWhen it is in, as shown in FIG.
Large coarse measurement value B_TwoTogether with the selection, JOG time F ₁
Smaller F_TwoTo be selected. I.e. weighing
If the set value A is smaller than the boundary D of the regression curve X,
Compared to the case where it is larger than the field D, the amount to be finely measured is large.
And that the metering valve 4 is opened and closed in smaller increments.
Become. Note that Y in FIG._TwoAnd if
It is a regression curve.

As described above, in the present invention, when the weighing set value A is input to the control panel 7, the appropriate rough weighing value B ₁ or B ₂ is selected and automatically input according to the magnitude of the weighing set value A. Since the setting is made, it is possible to quickly and accurately perform the weighing work of the bulk goods regardless of the experience of the operator.

In the above embodiment, the rough measurement value is set to 2
Although the case where the number of stages is set is shown, it is of course that the number of stages is three or more, and various changes can be made without departing from the scope of the present invention.

[0018]

As described above, according to the measurement control method for bulk goods by the weighing apparatus of the present invention, the measurement valve at the discharge port of the bulk storage container is opened by a command from the control panel to discharge the bulk goods. Then, the discharged bulk is received by the weighing hopper supported by the load cell, and after performing the rough weighing based on the detection value of the load cell until the rough weighing value is reached, the command from the control panel is sent. In a weighing control method for bulk goods by a weighing device that opens and closes a weighing valve to perform fine weighing, if a plurality of coarse weighing values are set in advance in the control panel and the weighing set value is input. Depending on the size of the measured set value, an appropriate rough measured value is selected from the plurality of coarse measured values based on the actual measured value data, and the rough measurement is performed until the selected rough measured value is reached. After opening the metering valve, open and close the metering valve with the opening and closing time according to the rough measured value. So as to perform fine metering, also as actual weighing data, for selecting the appropriate roughness metric,
In advance, based on the relationship between various measurement set values and the actual measurement value measured based on a certain rough measurement value, the range in which a stable measurement setting value is obtained and the range in which the coarse measurement value must be changed Since the boundary of the measurement is calculated, it is possible to perform the weighing work of bulk goods quickly and accurately by selecting an appropriate rough weighing value according to the size of the weighing setting value without depending on the experience of the operator. It has the excellent effect of being able to.

[Brief description of drawings]

FIG. 1 is a flow chart showing an embodiment of a weighing control method for bulk goods by a weighing device of the present invention.

FIG. 2 is a trend value graph adopted in the present invention.

FIG. 3 is a diagram showing a relationship between a two-step setting rough measurement value and a measurement setting value adopted in the present invention.

FIG. 4 is a schematic view showing an example of a bulk weighing device.

FIG. 5 is an example diagram showing a relationship between a coarse measurement value and a fine measurement value with respect to a measurement setting value.

[Explanation of symbols]

1 Raw material (bulk cargo) 2 Storage bin (bulk cargo storage container) 3 Actuator 4 Metering valve 5 Load cell (load cell) 6 Weighing hopper 7 Control panel A Weighing set value B ₁ , B ₂ Coarse weighing value

Claims (2)

[Claims] 1. A metering valve at a discharge port of a bulk storage container is opened by a command from a control panel to discharge a bulk, and the discharged bulk is received by a weighing hopper supported by a load meter. Based on the detection value of the load cell, rough weighing is performed until the rough weighing value is reached, and then the weighing valve is opened / closed by a command from the control panel to perform fine weighing. In the control method, when the coarse measurement values of a plurality of stages are set in advance on the control panel and the measurement setting values are input,
According to the size of the weighing set value, an appropriate rough weighing value is selected from the plurality of rough weighing values based on the actual weighing value data, and the rough weighing is performed until the selected rough weighing value is reached. After that, a weighing control method for a bulk load by a weighing device is characterized in that the weighing valve is opened and closed for fine weighing by opening and closing time according to the rough weighing value. 2. As actual measured value data for selecting an appropriate rough measured value, based on a relationship between various measured set values and an actual measured value measured based on a constant rough measured value in advance, 2. The weighing control method for bulk goods by the weighing device according to claim 1, wherein a boundary between a range where a stable weighing set value is obtained and a range where the rough weighing value must be changed is obtained.