JP3834768B2

JP3834768B2 - Method for controlling weighing of bulk goods using weighing device

Info

Publication number: JP3834768B2
Application number: JP2001323428A
Authority: JP
Inventors: 浩明増田
Original assignee: 石川島建機株式会社
Priority date: 2001-10-22
Filing date: 2001-10-22
Publication date: 2006-10-18
Anticipated expiration: 2021-10-22
Also published as: JP2003130718A

Description

【０００１】
【発明の属する技術分野】
本発明はバッチャープラントで取り扱われるセメントや骨材の如きばら荷を計量する計量装置によるばら荷の計量制御方法に関するものである。
【０００２】
【従来の技術】
たとえば、生コンクリートは、コンクリート打設時の作業性や構造物が必要とするコンクリート強度等により、セメント、骨材、水等の配合比が選定されるが、これらの配合比を正確に設定するためには、正確な計量が必要となる。
【０００３】
バッチャープラントにおいて、上記セメントや骨材の如きばら荷を計量する計量装置としては、図４にその一例の概略を示す如く、ばら荷であるセメント等の原料１を貯蔵するようにしてあるばら荷貯蔵容器としての貯蔵ビン２の下端排出口に流体圧シリンダの如きアクチュエータ３の作動で開閉するように装備させた計量弁（ゲート）４と、荷重計としてのロードセル５に支持させるようにして該計量弁４の下方に配置した計量ホッパ６と、粗計量を行った後に微計量を行って最終的に計量設定値となるように上記ロードセル５による検出値を基に上記アクチュエータ３へ制御指令を送る制御盤７とを有する構成としたものがある。なお、８は計量ホッパ６の放出弁を示す。
【０００４】
上記計量装置を用いて原料１の計量を行う場合は、図５に一例を示す如く、制御盤７に計量設定値（目標重量）Ａを入力すると共に、粗計量値（計量設定値Ａの何ｋｇ手前で粗計量を止めるかの設定値）Ｂを、該計量設定値Ａの大小に応じ選択して入力してから、計量開始スイッチをＯＮにするようにする。これにより、制御盤７からの指令でアクチュエータ３が作動させられて計量弁４が開放されることで、貯蔵ビン２内の原料１が計量ホッパ６内に一気に落下排出される粗計量が行われ、ロードセル５の検出値に基づく粗計量値（計量設定値−計量値）が上記入力設定された粗計量値Ｂに達すると、制御盤７からアクチュエータ３へ送られる指令により、計量弁４が一旦閉じられ、しかる後、計量弁４が所要のＪＯＧタイム（開閉時間）で小刻みに開閉されて原料１が少量宛落下排出される微計量が行われ、ロードセル５の検出値が微計量値（計量設定値Ａの何ｋｇ手前で計量弁４を全閉にするかの設定値：微計量カット値）Ｃになった時点で計量弁４が完全に閉じられることで計量が終了となる。なお、微計量値Ｃは、原料１の種類により異なり、計量弁４を全閉した後になおも落下してくる原料１の量を見込んで設定するものである。
【０００５】
上記計量装置による計量作業の場合、粗計量値Ｂが小さいほど（粗計量率が大きいほど）全体の計量時間を短くすることができるものであるが、計量設定値Ａが小さいときに粗計量値Ｂを小さく設定すると計量誤差（主として過計量）が起り易いという傾向があるので、通常は、計量設定値Ａの大小に応じて粗計量値Ｂの大小を選定するようにしている。
【０００６】
【発明が解決しようとする課題】
ところが、計量設定値Ａの大小の区分けを行うことは操作者の経験によるところが大きく、誰でもが適切な粗計量値Ｂを容易に設定することができるものではない。
【０００７】
因に、粗計量、微計量と分けることなく、ロードセル５の検出値を基に、計量設定値の大小に応じて計量弁４を閉じるタイミングを変えるようにして計量を行う方法もあるが、この方法の場合、計量ホッパ６が計量弁４の下方に位置する関係で、原料１の落下衝撃による荷重がロードセル５の検出値に大きな影響を与え、その影響を補正する設定値が直線的に変更できないことから、計量誤差がより生じ易いという問題がある。
【０００８】
そこで、本発明は、操作者の経験によらず、計量設定値の大小に応じた適切な粗計量値を選定して、ばら荷の計量作業を迅速且つ正確に行うことができるようにしようとするものである。
【０００９】
【課題を解決するための手段】
本発明は、上記課題を解決するために、ばら荷貯蔵容器の排出口の計量弁を、制御盤からの指令で開いてばら荷を排出させ、排出されたばら荷を荷重計で支持される計量ホッパで受けさせるようにして、荷重計の検出値を基に粗計量値に達するまで粗計量を行った後、制御盤からの指令で計量弁を開閉させて微計量を行うようにしてある計量装置によるばら荷の計量制御方法において、上記制御盤に予め複数段階の粗計量値を設定しておき、計量設定値が入力されると、該計量設定値の大小に応じ、実計量値データを基に上記複数の粗計量値の中から適切な粗計量値を選定して、該選定した粗計量値に達するまで上記粗計量を行わせた後、上記複数の粗計量値の中から小さい粗計量値を選定したときに選定する微計量時における計量弁の開閉時間の値に比して、より大きい粗計量値を選定するときには、微計量時における計量弁の開閉時間がより小さい値となるように選定する開閉時間で計量弁を開閉させて微計量を行わせるようにし、又、適切な粗計量値を選定するための実計量値データとして、予め、各種計量設定値と、一定の粗計量値に基づいて計量された実計量値との関係を基に、安定した計量設定値が得られる範囲と粗計量値を変動させなければならない範囲との境界を求めておくようにし、計量設置値が上記一定の粗計量値で安定した計量設定値が得られる範囲内にあるときに選定する粗計量値に比して、計量設定値が粗計量値を変動させなければならない範囲にあるときにはより大きい粗計量値となるように、粗計量値を選定する計量装置によるばら荷の計量制御方法とする。
【００１０】
制御盤に計量設定値が入力設定されると、該計量設定値が実計量値データと照合されることにより、適切な粗計量値が選定されて自動的に入力設定されるので、迅速且つ正確に計量作業を実施することができる。
【００１１】
【発明の実施の形態】
以下、本発明の実施の形態を図面を参照して説明する。
【００１２】
本発明のばら荷の計量制御方法は図４に示す計量装置を用いて行うもので、ばら荷貯蔵容器としての貯蔵ビン２の下端排出口にアクチュエータ３の作動で開閉するように装備させた計量弁４と、荷重計としてのロードセル５に支持されるようにして該計量弁４の下方に配置した計量ホッパ６と、粗計量を行った後に微計量を行って最終的に計量設定値となるように上記荷重計４の検出値を基に上記アクチュエータ３へ制御指令を送る制御盤７とからなる計量装置において、図１のフローに示す如く、上記制御盤７に予め２段階の粗計量値（後述する図３のＢ_１、Ｂ_２）を設定しておき、計量設定値Ａが入力されると、該計量設定値Ａの大小に応じ、実計量値データを基に上記２段階の粗計量値Ｂ_１、Ｂ_２のうちから適切な粗計量値Ｂ_１又はＢ_２と該粗計量値に対応するＪＯＧタイムＦ_１又はＦ_２を選定して自動的に入力設定し、計量開始スイッチがＯＮになると、自動計量として、上記適切な粗計量値Ｂ_１又はＢ_２になるまで粗計量を行った後、微計量を行うようにする。
【００１３】
上記適切な粗計量値Ｂ_１又はＢ_２を選定するための実計量値データとしては、予め各種計量設定値と、一定の粗計量値で計量された実計量値との関係を基に、安定した計量値が得られる範囲と粗計量値を変動させなければならない範囲との境界を求めた傾向値グラフを用いるようにする。
【００１４】
上記実計量値データについて詳述すると、先ず、図２に一例を示す如く、一定の粗計量値における多数の計量設定値と、実際にそれらの値により計量された実計量値の誤差との関係から、計量設定値Ａが大〜小に変化した場合の実計量値の回帰曲線Ｘを最小二乗法により求め、更に、この回帰曲線Ｘにより、一定の粗計量値で計量設定値通り計量できる範囲Ｅ_１と、計量設定値により粗計量値を変更しなくてはならない範囲Ｅ_２との境界Ｄを、回帰曲線Ｘの傾きが急速に変る点から求めるようにする。なお、上記実計量値の誤差は、量として求めても、率として求めてもよい。
【００１５】
したがって、計量設定値Ａが図２の範囲Ｅ_１内にあるときは、図３に示す如く小さい粗計量値Ｂ_１を選定すると共に、微計量時における計量弁４の開閉時間であるＪＯＧタイムを大きい値Ｆ_１に選定し、計量設定値Ａが図２の範囲Ｅ_２にあるときは、図３に示す如く大きい粗計量値Ｂ_２を選定すると共に、ＪＯＧタイムをＦ_１より小さいＦ_２に選定するものである。すなわち、計量設定値Ａが回帰曲線Ｘの境界Ｄよりも小さい場合は、境界Ｄよりも大きい場合に比し、微計量する量が多くなり、且つ計量弁４の開閉がより小刻みに行われることになる。なお、図２のＹは、粗計量値をＢ_２とした場合の回帰曲線である。
【００１６】
このように、本発明では、制御盤７に計量設定値Ａを入力すると、その計量設定値Ａの大小に応じ適切な粗計量値Ｂ_１又はＢ_２が選定されて自動的に入力設定されるようにしてあるので、操作者の経験の如何によらず、ばら荷の計量作業を迅速且つ正確に行うことができる。
【００１７】
なお、上記実施の形態では、粗計量値を２段階に定めた場合を示したが、３段階以上とすることは任意であること、その他本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。
【００１８】
【発明の効果】
以上述べた如く、本発明の計量装置によるばら荷の計量制御方法によれば、ばら荷貯蔵容器の排出口の計量弁を、制御盤からの指令で開いてばら荷を排出させ、排出されたばら荷を荷重計で支持される計量ホッパで受けさせるようにして、荷重計の検出値を基に粗計量値に達するまで粗計量を行った後、制御盤からの指令で計量弁を開閉させて微計量を行うようにしてある計量装置によるばら荷の計量制御方法において、上記制御盤に予め複数段階の粗計量値を設定しておき、計量設定値が入力されると、該計量設定値の大小に応じ、実計量値データを基に上記複数の粗計量値の中から適切な粗計量値を選定して、該選定した粗計量値に達するまで上記粗計量を行わせた後、上記複数の粗計量値の中から小さい粗計量値を選定したときに選定する微計量時における計量弁の開閉時間の値に比して、より大きい粗計量値を選定するときには、微計量時における計量弁の開閉時間がより小さい値となるように選定する開閉時間で計量弁を開閉させて微計量を行わせるようにし、又、適切な粗計量値を選定するための実計量値データとして、予め、各種計量設定値と、一定の粗計量値に基づいて計量された実計量値との関係を基に、安定した計量設定値が得られる範囲と粗計量値を変動させなければならない範囲との境界を求めておくようにし、計量設置値が上記一定の粗計量値で安定した計量設定値が得られる範囲内にあるときに選定する粗計量値に比して、計量設定値が粗計量値を変動させなければならない範囲にあるときにはより大きい粗計量値となるように、粗計量値を選定するようにするので、操作者の経験によらずに、計量設定値の大小に応じた適切な粗計量値を選定できることにより、ばら荷の計量作業を迅速且つ正確に行うことができる、という優れた効果を発揮する。
【図面の簡単な説明】
【図１】本発明の計量装置によるばら荷の計量制御方法の実施の一形態を示すフローである。
【図２】本発明で採用した傾向値グラフである。
【図３】本発明で採用した２段階設定の粗計量値と計量設定値との関係を示す図である。
【図４】ばら荷計量装置の一例を示す概略図である。
【図５】計量設定値に対する粗計量値及び微計量値の関係を示す一例図である。
【符号の説明】
１原料（ばら荷）
２貯蔵ビン（ばら荷貯蔵容器）
３アクチュエータ
４計量弁
５ロードセル（荷重計）
６計量ホッパ
７制御盤
Ａ計量設定値
Ｂ_１，Ｂ_２粗計量値[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a weighing control method for a bulk load by a weighing device for weighing a bulk load such as cement and aggregate handled in a batcher plant.
[0002]
[Prior art]
For example, for ready-mixed concrete, the mixing ratio of cement, aggregate, water, etc. is selected depending on the workability when placing concrete and the concrete strength required by the structure, etc., but these mixing ratios are set accurately. In order to do this, accurate weighing is required.
[0003]
In a batcher plant, as a measuring device for measuring a bulk load such as cement or aggregate, a bulk material such as cement as a bulk load is stored as shown in FIG. The lower end discharge port of the storage bin 2 as a load storage container is supported by a measuring valve (gate) 4 that is equipped to open and close by the operation of an actuator 3 such as a fluid pressure cylinder, and a load cell 5 as a load meter. A control command is sent to the actuator 3 on the basis of the value detected by the load cell 5 so that the weighing hopper 6 disposed below the metering valve 4 and fine weighing after coarse weighing and finally the weighing set value are obtained. There is a configuration having a control panel 7 for sending a signal. Reference numeral 8 denotes a discharge valve of the weighing hopper 6.
[0004]
When weighing the raw material 1 using the 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 coarse weighing value (the weighing setting value A A setting value (B) indicating whether to stop coarse weighing before kg) is selected and input according to the magnitude of the weighing setting value A, and then the weighing start switch is turned on. As a result, the actuator 3 is operated in response to a command from the control panel 7 and the metering valve 4 is opened, so that the raw material 1 in the storage bin 2 is dropped into the metering hopper 6 and discharged at once. When the coarse measurement value (measurement set value−measurement value) based on the detected value of the load cell 5 reaches the coarse measurement value B set as input, the measurement valve 4 is temporarily turned on by a command sent from the control panel 7 to the actuator 3. After that, the metering valve 4 is opened and closed in small increments with the required JOG time (opening and closing time), and fine weighing is performed in which the raw material 1 is dropped and discharged to a small amount. Before the set value A, the metering valve 4 is fully closed at the time when the set value of the metering valve 4 is fully closed: the fine metering cut value) C. When the metering valve 4 is completely closed, the measurement ends. Note that the fine measurement value C differs depending on the type of the raw material 1 and is set in anticipation of the amount of the raw material 1 that still falls after the measurement valve 4 is fully closed.
[0005]
In the case of the weighing work by the weighing device, the overall weighing time can be shortened as the coarse weighing value B is small (the coarse weighing ratio is large), but the coarse weighing value is small when the weighing set value A is small. If B is set small, a measurement error (mainly overweighing) tends to occur. Therefore, the coarse measurement value B is usually selected according to the measurement set value A.
[0006]
[Problems to be solved by the invention]
However, the classification of the measurement set value A is largely based on the experience of the operator, and not everyone can easily set an appropriate coarse measurement value B.
[0007]
Incidentally, there is a method of measuring by changing the timing of closing the metering valve 4 according to the magnitude of the measurement set value based on the detection value of the load cell 5 without dividing it into coarse measurement and fine measurement. In the case of the method, since the weighing hopper 6 is positioned below the measuring 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, and the setting value for correcting the influence is linearly changed. Since this is not possible, there is a problem that a measurement error is more likely to occur.
[0008]
In view of the above, the present invention selects an appropriate coarse weighing value according to the magnitude of the weighing set value, regardless of the experience of the operator, so that the weighing operation of the bulk load can be performed quickly and accurately. To do.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention opens the measuring valve at the discharge port of the bulk storage container in response to a command from the control panel to discharge the bulk load, and the discharged bulk load is supported by the load meter. After being measured by the weighing hopper until it reaches the coarse weighing value based on the value detected by the load meter, the weighing valve is opened and closed by a command from the control panel to perform fine weighing. In a bulk weighing control method using a weighing device, coarse weighing values in a plurality of stages are set in advance on the control panel, and when weighing setting values are input, actual weighing value data is determined according to the magnitude of the weighing setting values. by selecting the appropriate roughness metric from the plurality of coarse metric based on, after performing the above crude weighed until a coarse weight value obtained by the selected smaller from the plurality of coarse weighing Opening and closing the metering valve during fine weighing, which is selected when the coarse weighing value is selected Compared to a value of between greater than when selecting a crude metric values, perform fine metering by opening and closing the metering valve in opening and closing times of opening and closing times of the metering valve is selected to be smaller value at the time of fine metering In addition, as actual measurement value data for selecting an appropriate coarse measurement value, based on the relationship between various measurement setting values and the actual measurement value measured based on a fixed coarse measurement value in advance. Therefore, the boundary between the range where the stable weighing set value can be obtained and the range where the coarse weighing value must be changed is found, and the stable setting value can be obtained with the above-mentioned constant coarse weighing value. Select the coarse weighing value so that the coarse weighing value is larger when the weighing set value is within the range where the coarse weighing value must be changed compared to the coarse weighing value to be selected when it is within the specified range. How to control the weighing of bulk goods using a weighing device To.
[0010]
When the weighing set value is input and set in the control panel, the weighing set value is collated with the actual weighing value data, so that an appropriate coarse weighing value is selected and automatically entered and set. It is possible to carry out weighing work.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
The bulk weighing control method of the present invention is carried out using the weighing device shown in FIG. 4, and is a weighing equipped with an actuator 3 that opens and closes the lower end discharge port of a storage bin 2 as a bulk storage container. The valve 4 and the weighing hopper 6 disposed below the measuring valve 4 so as to be supported by the load cell 5 as a load meter, and after the coarse measurement, fine measurement is performed and finally the measurement set value is obtained. As shown in the flow of FIG. 1, in the weighing device comprising the control panel 7 for sending a control command to the actuator 3 based on the detected value of the load meter 4 (B ₁ , B ₂ in FIG. 3 to be described later) is set, and when the measurement set value A is input, the above two levels of coarseness are set based on the actual measurement value data according to the magnitude of the measurement set value A. weighing value _B 1, suitable roughness metric from among the _{B 2} _{B 1} Is automatically input settings by selecting the JOG time F ₁ or F ₂ corresponding to the B ₂ and crude metric value, the measurement start switch is turned ON, as an automatic weighing, the appropriate coarse metric B ₁ or after coarse metering until the B _2, to perform the fine weighing.
[0013]
Examples of the suitable roughness metric B ₁ or B ₂ real weighing data, for selecting, based on the advance various metering setting value, the relationship between the actual weight value that is metered at a constant rough weighing, stable A trend value graph in which the boundary between the range in which the measured value is obtained and the range in which the coarse measured value must be varied is used.
[0014]
The actual measurement value data will be described in detail. First, as shown in FIG. 2, as an example, the relationship between a large number of measurement set values in a fixed coarse measurement value and errors in actual measurement values actually measured by these values. From this, the regression curve X of the actual measurement value when the measurement set value A changes from large to small is obtained by the least square method, and further, the range that can be measured according to the measurement set value with a constant coarse measurement value by this regression curve X and E _1, the boundary D between the range E ₂ that has to change the coarse weighing by the weighing set value, the slope of the regression curve X is to seek the point of change rapidly. The error of the actual measurement value may be obtained as a quantity or a rate.
[0015]
Therefore, when the measurement set value A is within the range E ₁ in FIG. 2, a small coarse measurement value B ₁ is selected as shown in FIG. 3, and the JOG time that is the opening / closing time of the measurement valve 4 at the time of fine measurement is set. selected to a large value _{F 1,} when the metering setting value a is in the range _{E 2} of Figure 2, as well as selecting the coarse weighing _{B 2} larger as shown in FIG. 3, the JOG time to _{F 1} is smaller than _{F 2} It is to be selected. That is, when the measurement set value A is smaller than the boundary D of the regression curve X, the amount to be finely measured is larger than when the measurement set value A is larger than the boundary D, and the metering valve 4 is opened and closed in smaller increments. become. Incidentally, Y in FIG. 2 is a regression curve when the coarse weighing value was B _2.
[0016]
Thus, in the present invention, when the measurement set value A is input to the control panel 7, an appropriate coarse measurement value B ₁ or B ₂ is selected and automatically set according to the magnitude of the measurement set value A. Thus, the weighing operation of the bulk load can be performed quickly and accurately regardless of the experience of the operator.
[0017]
In the above-described embodiment, the case where the coarse weighing value is determined in two stages has been shown. However, it is arbitrary to set the coarse weighing value to three or more stages, and various modifications are made without departing from the scope of the present invention. Of course you get.
[0018]
【The invention's effect】
As described above, according to the bulk weighing control method by the weighing device of the present invention, the bulk valve at the discharge port of the bulk storage container is opened by a command from the control panel, and the bulk load is discharged and discharged. After the bulk load is received by the weighing hopper supported by the load meter and the rough weighing is performed based on the detected value of the load meter until the coarse weighing value is reached, the weighing valve is opened and closed by a command from the control panel. In a bulk weighing control method using a weighing device that performs fine weighing, a coarse weighing value in a plurality of stages is set in advance on the control panel, and when the weighing setting value is input, the weighing setting value is set. depending on the magnitude, the actual weighing data select an appropriate crude metric from the plurality of coarse metric based on, after performing the above crude weighed until a coarse weight value obtained by the selection, the Selected when a small coarse weighing value is selected from multiple coarse weighing values That in comparison with the value of the opening and closing times of the metering valve during fine measuring, when selecting the larger coarse weighing is weighed in opening and closing times of opening and closing times of the metering valve during the fine metering is selected to be smaller value The valve is opened and closed to allow fine weighing, and the actual weighing value data for selecting an appropriate coarse weighing value was previously measured based on various weighing setting values and a fixed coarse weighing value. based on the relationship between the actual weight value, stable as the weighing set value previously obtained a boundary between a range which must be varied and the range and coarse metering values obtained, weighing installation value above a certain coarse metering Compared with the coarse weighing value selected when the stable weighing set value is obtained, the coarse weighing value is larger when the weighing set value is within the range where the coarse weighing value must be changed. To select the coarse weighing value Since sea urchin, regardless of the operator's experience, by being able to select an appropriate crude metric value corresponding to the magnitude of the weighing set value, it is possible to perform the weighing of bulk goods quickly and accurately, is excellent that the effect Demonstrate.
[Brief description of the drawings]
FIG. 1 is a flowchart showing an embodiment of a bulk weighing control method by a weighing device of the present invention.
FIG. 2 is a trend value graph employed in the present invention.
FIG. 3 is a diagram showing a relationship between a coarse weighing value and a weighing setting value that are set in two steps adopted in the present invention.
FIG. 4 is a schematic view showing an example of a bulk load 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 set value.
[Explanation of symbols]
1 Raw materials (bulk)
2 Storage bottle (bulk storage container)
3 Actuator 4 Metering valve 5 Load cell
6 Weighing hopper 7 Control panel A Weighing set value B ₁ , B ₂ Coarse weighing value

Claims

ばら荷貯蔵容器の排出口の計量弁を、制御盤からの指令で開いてばら荷を排出させ、排出されたばら荷を荷重計で支持される計量ホッパで受けさせるようにして、荷重計の検出値を基に粗計量値に達するまで粗計量を行った後、制御盤からの指令で計量弁を開閉させて微計量を行うようにしてある計量装置によるばら荷の計量制御方法において、上記制御盤に予め複数段階の粗計量値を設定しておき、計量設定値が入力されると、該計量設定値の大小に応じ、実計量値データを基に上記複数の粗計量値の中から適切な粗計量値を選定して、該選定した粗計量値に達するまで上記粗計量を行わせた後、上記複数の粗計量値の中から小さい粗計量値を選定したときに選定する微計量時における計量弁の開閉時間の値に比して、より大きい粗計量値を選定するときには、微計量時における計量弁の開閉時間がより小さい値となるように選定する開閉時間で上記計量弁を開閉させて微計量を行わせるようにすることを特徴とする計量装置によるばら荷の計量制御方法。Open the weighing valve at the discharge port of the bulk storage container according to the command from the control panel to discharge the bulk load, and receive the discharged bulk load with the weighing hopper supported by the load meter. In the weighing control method for a bulk load by a weighing device in which coarse weighing is performed until the coarse weighing value is reached based on the detected value, and then the weighing valve is opened and closed by a command from the control panel to perform fine weighing. When a plurality of coarse weighing values are set in the control panel in advance, and the weighing setting value is input, the coarse weighing value is selected based on the actual weighing data according to the magnitude of the weighing setting value. Select the appropriate coarse weighing value, perform the coarse weighing until the selected coarse weighing value is reached, and then select the fine weighing value when selecting a small coarse weighing value from the multiple coarse weighing values. The coarse weighing value is larger than the value of the opening / closing time of the metering valve When selecting the rose by metering device characterized by opening and closing times of the metering valve during the fine metering is to carry out the fine metering by opening and closing the metering valve in opening and closing times for selected to be a value smaller than Load weighing control method.

適切な粗計量値を選定するための実計量値データとして、予め、各種計量設定値と、一定の粗計量値に基づいて計量された実計量値との関係を基に、安定した計量設定値が得られる範囲と粗計量値を変動させなければならない範囲との境界を求めておくようにし、計量設置値が上記一定の粗計量値で安定した計量設定値が得られる範囲内にあるときに選定する粗計量値に比して、計量設定値が粗計量値を変動させなければならない範囲にあるときにはより大きい粗計量値となるように、粗計量値を選定するようにする請求項１記載の計量装置によるばら荷の計量制御方法。As the actual weighing value data for selecting an appropriate coarse weighing value, stable weighing setting values based on the relationship between various weighing setting values and the actual weighing values measured based on a certain rough weighing value in advance. When the boundary between the range where the measurement value is obtained and the range where the coarse measurement value must be changed is determined, and the measurement installation value is within the range where a stable measurement set value can be obtained with the above-mentioned constant coarse measurement value The coarse weighing value is selected so that the coarse weighing value is larger than the coarse weighing value to be selected when the weighing set value is within a range in which the coarse weighing value must be varied. A method for controlling weighing of bulk goods by the described weighing device.