JPS6348684B2 - - Google Patents
Info
- Publication number
- JPS6348684B2 JPS6348684B2 JP52145655A JP14565577A JPS6348684B2 JP S6348684 B2 JPS6348684 B2 JP S6348684B2 JP 52145655 A JP52145655 A JP 52145655A JP 14565577 A JP14565577 A JP 14565577A JP S6348684 B2 JPS6348684 B2 JP S6348684B2
- Authority
- JP
- Japan
- Prior art keywords
- load
- load current
- motor
- waveform
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 claims description 5
- 239000000284 extract Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000035945 sensitivity Effects 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 5
- 230000010363 phase shift Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000012615 aggregate Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Control Of Electric Motors In General (AREA)
Description
【発明の詳細な説明】
本発明はバツチヤプラント等の生コンクリート
の混練り装置の負荷信号の検出方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting a load signal of a ready-mixed concrete mixing device such as a batch plant.
一般にコンクリートはセメント、水、骨材およ
び混和材を配合するこへによつて得られ、その配
合比によつて得られるコンクリートの性質が違つ
てくることが良く知られている。 Generally, concrete is obtained by mixing cement, water, aggregate, and admixtures, and it is well known that the properties of the concrete obtained vary depending on the mixing ratio.
従つて通常、用途に合せて所要の一定の性質
（スランプ値）をもつコンクリートが経済的に得
られるようにその配合設計が行なわれている。し
かしながら、材料の種類およびその状態特にその
保存状態に伴う含水量等のばらつきが大きい等か
ら設計通りの一定の性質を備えたコンクリートを
得ることは非常に困難であつた。 Therefore, the mixture is usually designed so that concrete having certain properties (slump value) required for each purpose can be obtained economically. However, it has been extremely difficult to obtain concrete with certain properties as designed due to large variations in water content, etc., depending on the type of material and its condition, especially its storage condition.
一方前記コンクリートの性質（スランプ値）の
測定は通常日本工業規格に定められたスランプ試
験方法にのつとつて行なわれているが、この試験
方法ははん雑な手数を要し、しかも結果が得られ
るまでに多くの時間を要する等ぬ欠点があつた。 On the other hand, the above-mentioned concrete properties (slump value) are usually measured using the slump test method specified in the Japanese Industrial Standards, but this test method requires complicated steps and does not yield accurate results. There were drawbacks such as the long time it took to complete the process.
近年このような欠点を解決するためにミキサ内
に所定量のセメント、骨材、水、混和材を混入
し、混練り行なうとき、混練りされているコンク
リートの性質即ちスランプ値により混練りの撹拌
抵抗に相違があり、この相違がミキサを駆動する
電動機の負荷電流の相違となつて検出されること
を利用してスランプ値の電気的自動測定さらには
バツチヤプラントを自動制御することが検討され
つつある。 In recent years, in order to solve this problem, a predetermined amount of cement, aggregate, water, and admixtures are mixed into the mixer, and when mixing, the agitation of the mix is adjusted depending on the properties of the concrete being mixed, that is, the slump value. There is a difference in resistance, and this difference is detected as a difference in the load current of the motor that drives the mixer. Automatic electrical measurement of the slump value and automatic control of the batcher plant are being considered. It's coming.
従来、前記負荷電流による負荷信号の検出方法
として、電動機の電源ラインの一つに検出コイル
を設けこのコイル端子から負荷電流の絶対値を取
り出しこれを直接電流電圧変換器で変換して信号
電圧とすることが行なわれていた。 Conventionally, as a method for detecting a load signal based on the load current, a detection coil is provided on one of the power supply lines of the motor, and the absolute value of the load current is extracted from the coil terminal and converted directly to a signal voltage using a current-voltage converter. Something was being done.
しかしながら前記従来の方法ではミキサ内が空
の状態での運転時（以後無負荷時と呼ぶ）に検出
される負荷電流値に対して、ミキサ内に任意の配
合比で各材料が混入され混練りされている運転時
（以後全負荷時と呼ぶ）の負荷電流は高高２倍程
度でありその検出感度が低いと云う欠点があつ
た。このため該信号を用いたスランプ値の測定精
度、さらにはバツチヤプラントの制御の精度が上
がらないという云う大きな欠点となつていた。 However, in the conventional method, each material is mixed into the mixer at an arbitrary mixing ratio and kneaded in response to the load current value detected when the mixer is operating in an empty state (hereinafter referred to as no-load state). The load current during normal operation (hereinafter referred to as full load) is about twice as high as the high current, and the detection sensitivity is low. This has resulted in a major drawback in that the accuracy of measuring the slump value using the signal and furthermore the accuracy of controlling the batch plant cannot be improved.
本発明の目的は前記従来の欠点を除去せしめる
検出感度の大幅な改善を計つた負荷信号の検出方
法を提出することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a load signal detection method that eliminates the above-mentioned conventional drawbacks and significantly improves detection sensitivity.
本発明によれば、バツチヤプラントを駆動する
電動機の負荷電流の抽出において前記電動機を駆
動する駆動電圧波形と同一位相成分の負荷電流の
みを抽出し、かつ、前記バツチヤプラントの無負
荷時の前記負荷電流と全負荷時の前記負荷電流と
の差を負荷信号とすることを特徴とする負荷信号
の検出方法が得られる。 According to the present invention, in extracting the load current of the electric motor that drives the batchia plant, only the load current having the same phase component as the drive voltage waveform that drives the motor is extracted, and when the batchia plant is not loaded, A method for detecting a load signal is obtained, characterized in that the difference between the load current and the load current at full load is used as a load signal.
前記本発明によれば負荷信号の検出感度を従来
の４倍以上に高感度化することができる。 According to the present invention, the load signal detection sensitivity can be made four times or more higher than that of the conventional method.
以下本発明について図面を用いて詳述する。 The present invention will be explained in detail below with reference to the drawings.
第１図は従来の方法を説明するための図で電動
機の負荷電流を波形を模式的に示したもので、同
図ａは無負荷時、ｂは全負荷時のそれぞれ負荷電
流波形を示す。 FIG. 1 is a diagram for explaining the conventional method, and schematically shows the waveform of the load current of the motor. In the figure, a shows the waveform of the load current when there is no load, and b shows the waveform of the load current when the motor is fully loaded.
同図からも明らかなように負荷電流値は図の各
斜線部分の面積S11，S12それぞれに相当し、その
比は約２対１になつている。従つて従来の方法で
はS11−S12が有効負荷電流値であり有効負荷信号
として取り出される。 As is clear from the figure, the load current value corresponds to the areas S 11 and S 12 of each shaded area in the figure, respectively, and the ratio thereof is approximately 2:1. Therefore, in the conventional method, S 11 -S 12 is the effective load current value and is taken out as the effective load signal.
これに対して本願発明者はその実験において新
らしい事実を発見した。即ち、電動機の駆動電圧
波形と負荷電流波形を対比させたとき無負荷時に
おける両者の位相ずれは極めて大きく、全負荷時
における両者の位相ずれは逆に述さくなる事実が
明らかとなつた。 On the other hand, the inventor of the present application discovered a new fact in the experiment. That is, when comparing the drive voltage waveform of the motor and the load current waveform, it has become clear that the phase shift between the two at no load is extremely large, and the phase shift between the two at full load becomes difficult to describe.
本願はこの現象を利用して検出感度の向上を計
ろうとするものである。 The present application attempts to improve detection sensitivity by utilizing this phenomenon.
第２図は本発明を説明するための図で前記電動
機の駆動電圧波形と負荷電流波形の位相ずれの関
係を模式的に示す。 FIG. 2 is a diagram for explaining the present invention, and schematically shows the relationship between the phase shift between the drive voltage waveform of the motor and the load current waveform.
同図ａは無負荷時、同図ｂは全負荷時の各波形
の位相関係を示すものである。同図においてｅは
駆動電圧波形、ｉは負荷電流波形を示す。 Figure a shows the phase relationship of each waveform at no load, and Figure b shows the phase relationship of each waveform at full load. In the figure, e indicates a drive voltage waveform, and i indicates a load current waveform.
第２図から明らかなように無負荷時における駆
動電圧波形ｅと負荷電流波形ｉとの位相ずれθ21
は80度以上と大きく、これが全負荷時においては
両者の位相ずれθ22はわずか５度程度と小さくな
る。従つて駆動電圧波形と同一位相成分の負荷電
流値は図の各斜線面積に相当し、それぞれ無負荷
時がS21、全負荷時がS22となる。この両者の比は
８対１以上になり有効電流値としての変化分を大
幅に増加させることができる。 As is clear from Fig. 2, the phase shift between the drive voltage waveform e and the load current waveform i at no load is θ 21
is as large as 80 degrees or more, but at full load, the phase shift θ 22 between the two becomes as small as only about 5 degrees. Therefore, the load current value of the same phase component as the drive voltage waveform corresponds to each shaded area in the figure, and is S 21 at no load and S 22 at full load. The ratio between the two is 8:1 or more, and the amount of change in the effective current value can be significantly increased.
従つて前記無負時の負荷電流S21と全負荷時の
負荷電流S22との差を負荷信号とすることによつ
てバツチヤプラントのミキサ内で混練されている
生コンクリートの性質に100％依存する信号とし
て高精度かつ高感度に検出することができる。 Therefore, by using the difference between the load current S 21 at no load and the load current S 22 at full load as the load signal, the properties of the ready-mixed concrete being mixed in the mixer of the batchya plant can be controlled 100%. The dependent signal can be detected with high accuracy and sensitivity.
このような電動機の駆動電圧波形と同一位相の
負荷電流値のみを抽出する回路の一例を第３図に
示す。同図はダイオード３１，３２とトランジス
タ３６と抵抗３３，３４，３５を用いて最も簡単
な半波検出回路を構成せしめている。このような
本発明に適用し得る半波検出回路は第３図に限ら
れるものではなく各種の構成をとり得ることは云
うまでもない。 FIG. 3 shows an example of a circuit that extracts only the load current value having the same phase as the drive voltage waveform of the motor. The figure shows the simplest half-wave detection circuit using diodes 31, 32, a transistor 36, and resistors 33, 34, 35. It goes without saying that the half-wave detection circuit applicable to the present invention is not limited to the one shown in FIG. 3, and may have various configurations.
このように本発明によれば電動機の負荷信号の
検出感度を大幅に改善することができる。即ち混
練り時のコンクリートの性質（スランプ値）に依
存した負荷電流を高感度に取り出すことができる
ためにコンクリート混練り時のスランプ値の自動
測定、さらにはバツチヤプラントの自動制御にお
ける精度を大幅に改善することができ、本発明の
産業上の効果は極めて顕著なものである。 As described above, according to the present invention, the detection sensitivity of the load signal of the electric motor can be significantly improved. In other words, it is possible to extract with high sensitivity the load current that depends on the properties of concrete (slump value) during mixing, which greatly improves the accuracy of automatic measurement of slump value during concrete mixing and automatic control of the batch plant. The industrial effects of the present invention are extremely significant.
第１図ａ，ｂは従来方法を説明するための図で
電動機の負荷電流波形を模式的に示す図、第２図
ａ，ｂは本発明を説明するための図で電動機の駆
動電圧波形と負荷電流波形の位相関係を模式的に
示す図、第３図は本発明の一実施例を説明するた
めの図で電動機の駆動電圧波形と同一位相分の負
荷電流値を抽出するための回路の一例を示す。
図において３１，３２はダイオード、３３，３
４，３５は抵抗、３６はトランジスタを示す。
Figures 1a and b are diagrams for explaining the conventional method and schematically show the load current waveform of the motor, and Figures 2a and b are diagrams for explaining the present invention and are diagrams showing the drive voltage waveform of the motor. FIG. 3 is a diagram schematically showing the phase relationship of load current waveforms, and is a diagram for explaining one embodiment of the present invention, and is a diagram showing a circuit for extracting a load current value of the same phase as the driving voltage waveform of a motor. An example is shown. In the figure, 31, 32 are diodes, 33, 3
4 and 35 are resistors, and 36 is a transistor.
Claims (1)
流の抽出において、前記電動機を駆動する駆動電
圧波形と同一位相成分の負荷電流のみを抽出し、
かつ前記バツチヤプラントの無負荷時の前記負荷
電流と全負荷時の前記負荷電流との差を負荷信号
とすることを特徴とする負荷信号の検出方法。1. In extracting the load current of the motor that drives the Batsha plant, extract only the load current that has the same phase component as the drive voltage waveform that drives the motor,
A method for detecting a load signal, characterized in that the difference between the load current at no load and the load current at full load of the batch plant is used as the load signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14565577A JPS5479075A (en) | 1977-12-06 | 1977-12-06 | Method of detecting load signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14565577A JPS5479075A (en) | 1977-12-06 | 1977-12-06 | Method of detecting load signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5479075A JPS5479075A (en) | 1979-06-23 |
| JPS6348684B2 true JPS6348684B2 (en) | 1988-09-30 |
Family
ID=15390026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14565577A Granted JPS5479075A (en) | 1977-12-06 | 1977-12-06 | Method of detecting load signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5479075A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03130783U (en) * | 1990-04-16 | 1991-12-27 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS474150U (en) * | 1971-01-23 | 1972-09-08 |
-
1977
- 1977-12-06 JP JP14565577A patent/JPS5479075A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS474150U (en) * | 1971-01-23 | 1972-09-08 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03130783U (en) * | 1990-04-16 | 1991-12-27 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5479075A (en) | 1979-06-23 |
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