JP2004323134A

JP2004323134A - Conveyor transportation system

Info

Publication number: JP2004323134A
Application number: JP2003116790A
Authority: JP
Inventors: Yasuo Fukuda; 康生福田
Original assignee: Meidensha Corp; Meidensha Electric Manufacturing Co Ltd
Current assignee: Meidensha Corp; Meidensha Electric Manufacturing Co Ltd
Priority date: 2003-04-22
Filing date: 2003-04-22
Publication date: 2004-11-18
Anticipated expiration: 2023-04-22
Also published as: JP4182799B2

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect transportation amount in a system provided with a conveyor scale CS at an intermediate position to transport scheduled transportation amount accurately. <P>SOLUTION: This conveyor transportation system is provided with a load cell 2 for transporting a transportation object by scheduled transportation amount by conveyors A to E to detect weight at a C conveyor position and a speed detector 3 for detecting transportation speed. A 0 timing detection part S1 detects the approach to the scheduled transportation amount including loading amount of the A, B conveyors on the upstream side. A moving average computing part S2 obtains average transportation amount obtained by computing on a moving average basis transportation amount detected from weight and detection speed. An A, B loading amount computing part S3 predicts loading amount of an upstream side conveyor from average transportation amount, transportation speed, and conveyor length. A remaining operation time computing part S4 obtains a remaining operation time of the conveyor from 0 timing detection time based on a predicted loading amount value. A timer clocking part S5 obtains a stop command of the conveyor after the remaining operation time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、複数台のベルトコンベアを連接し、セメントやコークスなどの粉粒物を輸送するコンベア輸送システムに係り、特に予定輸送量だけ輸送するための輸送量検出装置に関する。
【０００２】
【従来の技術】
この種のコンベア輸送システムは、例えば、図２に示す構成にされる。Ａコンベア〜Ｅコンベアを連接し、先頭のＡコンベア位置で取り込まれる輸送物をＡ→Ｂ→Ｃ→Ｄ→Ｅの順に輸送し、最終のＥコンベアから輸送先Ｆに搬入する。各コンベアＡ〜Ｅの運転／停止制御は、コンベアＥ〜Ａの順で運転を開始することで輸送物がコンベア上で渋滞するのを防止し、予定輸送量の輸送検出でコンベアＡ〜Ｅの順で運転を停止することで、輸送物がコンベア上に残留するのを防止する。
【０００３】
ここで、輸送量検出装置には、コンベアスケールＣＳが通常よく用いられる（例えば、特許文献１、または特許文献２参照）。このコンベアスケールＣＳは、図３に例示するように、コンベア１の下部に取り付けたロードセル２によってその位置を搬送される輸送物の重量Ｗ（単位：ｋｇ）を検出し、コンベア１に係合させた速度検出器３によってコンベアの輸送速度Ｖ（単位：ｍ／ｓ）を検出し、ＣＳ演算部４では両者の掛け算で瞬時輸送量（単位：ｋｇ・ｍ／ｓ）を求め、この瞬時輸送量の時間積分で輸送量（単位：ｋｇ・ｍ）に比例した数のパルス信号を得る。例えば、輸送量が１０００ｋｇ・ｍに達したときに１パルスを出力する。このコンベアスケールＣＳを利用する場合、予定輸送量に対応する数値をカウンタにプリセットしておき、コンベアスケールＣＳからの出力パルスでカウンタをカウントダウンさせ、この値が０に達したときに予定輸送量に達したことのタイミング信号を得ることができる。予定輸送量の制御には、カウンタの０タイミングでコンベアの停止指令を発生する。
【０００４】
なお、速度検出器３をパルスピックアップ構成とする場合、輸送速度Ｖに比例した数のパルスを発生する（単位：パルス数／秒）。そして、ＣＳ演算部４では単位時間当たりのパルス数を計数することで輸送速度Ｖを求める。
【０００５】
【特許文献１】
特開平１０−２９１６３２号
【０００６】
【特許文献２】
特開平７−１０１５５２号
【０００７】
【発明が解決しようとする課題】
前記のコンベア輸送システムにおいて、コンベアスケールＣＳは起点となるＡコンベア位置に設置されない場合が多い。これは、システムの機構的な制約で、起点となるＡコンベアにコンベアスケールＣＳの取付けができないシステムの場合である。また、輸送物の下流になる終点のＥコンベア側にコンベアスケールＣＳを取り付ける方が、Ｃコンベアなどの中間のコンベアで「荷こぼれ」が発生した場合にも予定輸送量の正確な検出を可能とするシステムの場合もある。
【０００８】
上記のように、コンベアスケールＣＳを起点となるＡコンベアより下流側のコンベアに取り付けたシステムの場合、前記のように、コンベアスケールＣＳから出力されるパルスでカウンタをカウントダウンすることで予定輸送量に達したことを検出する方法では、実際の目的輸送量との間に大きなズレが発生する。
【０００９】
例えば、図４に示すように、コンベアスケールＣＳをＣコンベアに設けた場合、コンベアスケールＣＳによって予定輸送量が検出されたタイミングで、Ａコンベア→Ｅコンベアの順に停止させると、ＡコンベアおよびＢコンベア上の輸送物が終点まで輸送されてしまい、この場合は輸送先Ｆでは予定輸送量を超過して搬入される。
【００１０】
この場合、予定輸送量ＰＫ（単位：ｋｇ・ｍ）とし、ＡコンベアとＢコンベアの載荷量に対応させた定数Ｋ１（単位：ｋｇ・ｍ）とし、この定数Ｋ１を見越した下記の演算、
【００１１】
【数２】
（ＰＫ−Ｋ１）−コンベアスケールＣＳの発生パルス数＝０
が成立する０タイミングでコンベア停止指令を発生すると、ＡコンベアとＢコンベアの載荷量を含めた予定輸送量ＰＫの輸送ができる。
【００１２】
しかし、ＡコンベアとＢコンベアの実際の載荷量が定数Ｋ１から外れていると、予定した輸送量の不足または超過となってしまう。
【００１３】
本発明の目的は、連接コンベアの中間位置にコンベアスケールＣＳを設置したシステム構成で、輸送量を正確に検出した輸送ができるコンベア輸送システムを提供することにある。
【００１４】
【課題を解決するための手段】
本発明は、前記の課題を解決するため、コンベアスケールを設置するコンベアよりも上流側のコンベアの載荷量を含めて予定輸送量に近づいたことを０タイミング検出し、この検出時に、上流側コンベアの載荷量をコンベアスケールを設置したコンベアでの瞬時輸送量の平均値と輸送速度およびコンベア機長から予測し、この予測値を基に０タイミング検出後に必要なコンベアの残り運転時間を求め、この残り運転時間後にコンベアの停止指令を得ること、または残り運転時間０を検出したときにコンベアの停止指令を得るようにしたもので、以下の構成を特徴とする。
【００１５】
（１）連接した複数台のコンベアによって輸送物を予定輸送量だけ輸送し、中間コンベアにはその位置での輸送物の重量を検出するロードセルと、輸送速度を検出する速度検出器と、前記重量と輸送速度の検出値から算出される瞬時輸送量を基に求める輸送量が予定輸送量に達したことを検出してコンベア停止指令を得る輸送量検出制御手段とを備えたコンベア輸送システムであって、
前記輸送量検出制御手段は、
前記ロードセルおよび速度検出器を設置するコンベアよりも上流側のコンベアの載荷量を含めた輸送量が予定輸送量に近づいたことを検出する０タイミング検出部と、
前記０タイミングの検出時に、前記瞬時輸送量とコンベア機長から前記上流側コンベアの載荷量を予測する載荷量演算部と、
前記上流側コンベアの載荷量予測値を基に前記０タイミング検出時からのコンベアの残り運転時間を求める残り運転時間演算部と、
前記０タイミング検出時から前記残り運転時間後にコンベアの停止指令を得るタイマ計時部とを備えたことを特徴とする。
【００１６】
（２）連接した複数台のコンベアによって輸送物を予定輸送量だけ輸送し、中間コンベアにはその位置での輸送物の重量を検出するロードセルと、輸送速度を検出する速度検出器と、前記重量と輸送速度の検出値から算出される瞬時輸送量を基に求める輸送量が予定輸送量に達したことを検出してコンベア停止指令を得る輸送量検出制御手段とを備えたコンベア輸送システムであって、
前記輸送量検出制御手段は、
前記ロードセルおよび速度検出器を設置するコンベアよりも上流側のコンベアの載荷量を含めた輸送量が予定輸送量に近づいたことを検出する０タイミング検出部と、
前記瞬時輸送量とコンベア機長から前記上流側コンベアの載荷量を予測する載荷量演算部と、
前記０タイミングの検出後に、前記載荷量演算部による載荷量の予測を繰り返し、この予測時刻ｔ_１，ｔ_２，…，ｔ_Ｎ毎に下記式、
【００１７】
【数３】
Ｋ−Ｑ_Ｎ−ΣＱ＝０
ただし、
Ｋは０タイミング検出時に設定する上流側コンベアの載荷量定数、
Ｑ_Ｎは予測時刻ｔ_１〜ｔ_Ｎでそれぞれ求められた載荷量予測値、
ΣＱは予測時刻ｔ_１〜ｔ_Ｎでそれぞれ求められた輸送量の合計値、
の演算を行い、該演算式が成立したときにコンベア停止指令を得る演算手段とを備えたことを特徴とする。
【００１８】
（３）前記０タイミング検出部は、前記予定輸送量ＰＫから、上流側コンベアの載荷量として設定する定数Ｋ１および該定数Ｋ１の正負誤差分としての載荷量余裕定数Ｋ２を差し引いた値が、前記輸送速度と瞬時輸送量から求める輸送量に達したときに０タイミングを検出することを特徴とする。
【００１９】
（４）前記重量と輸送速度から求める瞬時輸送量を移動平均演算した平均輸送量を前記載荷量演算部での瞬時輸送量とする移動平均演算部を備えたことを特徴とする。
【００２０】
【発明の実施の形態】
図１は、本発明の実施形態を示す輸送量検出制御装置のブロック構成図である。コンベア輸送システムは、図４と同様に、Ａ〜Ｅコンベアが連接されて輸送物を輸送先Ｆまで予定量だけ輸送し、Ｃコンベア位置にコンベアスケールＣＳを設置したコンベア輸送システムの場合である。
【００２１】
コンベアスケールＣＳは、従来と同様に、ロードセル２はその位置を搬送される輸送物の重量Ｗ（単位：ｋｇ）を検出し、速度検出器３はコンベアの輸送速度Ｖ（単位：ｍ／ｓ）を単位時間当たりのパルス数として検出する。ＣＳ演算部４は、これら重量と速度の積で求める瞬時輸送量（単位：ｋｇ・ｍ／ｓ）を時間積分して輸送量（単位：ｋｇ・ｍ）に比例した数のパルス信号を得る。例えば、輸送量が１０００ｋｇ・ｍに達する毎に１パルスを発生する。
【００２２】
輸送量検出制御装置５は、ソフトウェア構成する以下のシーケンス処理手段Ｓ１〜Ｓ５によって予定輸送量を輸送できるタイミングを検出し、この検出でコンベア停止指令を出す。
【００２３】
０タイミング検出部Ｓ１は、輸送開始後、予定輸送量ＰＫ（単位：ｋｇ・ｍ）と、ＡコンベアとＢコンベアの載荷量として予測設定する定数Ｋ１（単位：ｋｇ・ｍ）、さらに載荷量余裕定数Ｋ２（単位：ｋｇ・ｍ）を使って、下記の減算式の成立で０タイミングを求める。
【００２４】
【数４】
（ＰＫ−Ｋ１−Ｋ２）−ＣＳ演算部４の発生パルス数＝０
この０タイミングでは、ＡコンベアとＢコンベアの載荷量定数Ｋ１の他、載荷量余裕定数Ｋ２を含めることで現在までの輸送量が予定輸送量ＰＫ近くに達したことを検出する。
【００２５】
ここで、０タイミングでコンベア運転を停止制御に入ると、Ａ，Ｂコンベア上の実際の載荷量と定数Ｋ１との差分（正または負）によって輸送量の不足または超過を招く。この不足または超過のいずれの場合にも差分を補正できるよう、載荷量余裕定数Ｋ２を含ませた０タイミングの検出を行う。
【００２６】
移動平均演算部Ｓ２は、ロードセル２で検出する重量と速度検出器３で検出する輸送速度から瞬時輸送量（単位：ｋｇ・ｍ／ｓ）を求め、その移動平均演算を実行しておき、０タイミング検出時点での平均輸送量Ｑ（ｋｇ・ｍ／ｓ）を求める。この平均輸送量Ｑは、Ｃコンベア上に載荷される輸送物の平均輸送量になるが、Ａ，Ｂコンベア上に載荷される輸送物の平均輸送量を予測したものにもなる。なお、移動平均演算は、求める瞬時輸送量の値を一定周期でサンプリングし、現在からＮサンプル過去までのサンプル値をＮで除算することの繰り返しなる。
【００２７】
Ａ，Ｂ載荷量演算部Ｓ３は、平均輸送量ＱとＡ，Ｂコンベアの機長Ｌ_Ａ，Ｌ_Ｂ（既定値）およびコンベアの輸送速度Ｖ（単位時間当たりのパルスピックアップ３のパルス計数値）より、下記式により０タイミング検出時のＡ，Ｂコンベアの載荷量予測値Ｑ_Ａ，Ｑ_Ｂ（単位：ｋｇ・ｍ）を求める。
【００２８】
【数５】
Ｑ_Ａ＝Ｑ×Ｌ_Ａ／Ｖ
Ｑ_Ｂ＝Ｑ×Ｌ_Ｂ／Ｖ
なお、厳密な載荷量演算には、ＣコンベアのコンベアスケールＣＳ位置までの機長Ｌ_Ｃを使ったＣコンベア上の載荷量Ｑ_Ｃ（＝Ｑ×Ｌ_Ｃ／Ｖ）も含ませるのが好ましい。
【００２９】
残り運転時間演算部Ｓ４は、０タイミング検出部Ｓ１の検出に供した定数Ｋ１，Ｋ２と、Ａ，Ｂコンベアの載荷量予測値Ｑ_Ａ，Ｑ_Ｂとの差分を求め、これを平均輸送量Ｑで除算することでコンベア停止制御までの残り運転時間Ｔ（単位：秒）を求める。
【００３０】
【数６】
Ｔ＝（（Ｋ１＋Ｋ２）−（Ｑ_Ａ＋Ｑ_Ｂ））／Ｑ
タイマ計時部Ｓ５は、残り運転時間Ｔを設定したタイマ処理により、該時間Ｔに達したときにコンベア停止指令を出す。
【００３１】
したがって、コンベア停止指令は、０タイミング検出部Ｓ１の検出時点からＴ時間後に出され、Ａ，Ｂコンベアの載荷分を正確に検出して輸送量の不足／超過を無くしたコンベア停止制御ができる。
【００３２】
なお、実施形態では、０タイミング検出時に１回だけ移動平均演算を行って平均輸送量Ｑを求め、これを基に残り運転時間Ｔを求める場合を示すが、０タイミング検出後に、処理Ｓ２，Ｓ３を時刻ｔ_１，ｔ_２，…，ｔ_Ｎ毎に下記式、
【００３３】
【数７】
Ｋ−Ｑ_Ｎ−ΣＱ＝０
ただし、
Ｋ＝（Ｋ１＋Ｋ２）、Ｑ_Ｎ＝（Ｑ_ＡＮ＋Ｑ_ＢＮ）
ΣＱは時刻ｔ_１〜ｔ_Ｎでそれぞれ求められた輸送量Ｑ_１〜Ｑ_Ｎの合計値、
Ｑ_ＡＮ，Ｑ_ＢＮは時刻ｔ_１〜ｔ_Ｎでそれぞれ求められたＡ，Ｂコンベアの載荷量予測値。
の演算を繰り返し、この式が成立したときにコンベア停止指令を得ることもできる。この場合、Ａ，Ｂコンベアの載荷量がそのコンベア位置によって変化している場合にも、それら変化分を補正した高い精度の輸送ができる。
【００３４】
また、実施形態では、ＣコンベアにコンベアスケールＣＳを設置する場合を示すが、これをＢコンベア、ＤコンベアやＥコンベアに設置する場合も同様の演算処理で済む。
【００３５】
【発明の効果】
以上のとおり、本発明によれば、コンベアスケールを設置するコンベアよりも上流側のコンベアの載荷量を含めて予定輸送量に近づいたことを０タイミング検出し、この検出時に、上流側コンベアの載荷量をコンベアスケールを設置したコンベアでの瞬時輸送量の平均値と輸送速度およびコンベア機長から予測し、この予測値を基に０タイミング検出後に必要なコンベアの残り運転時間を求め、この残り運転時間後にコンベアの停止指令を得ること、または残り運転時間０を検出したときにコンベアの停止指令を得るようにしたため、中間位置にコンベアスケールＣＳを設置したシステムにおける輸送量を正確に検出し、予定輸送量の正確な輸送ができる。
【００３６】
なお、ＣＳ演算要素としては、通常のシーケンサがもつ処理機能を利用することができ、特別な制御手段を用いる事なく容易に実現される。また、連接コンベアの途中にダンパなどの装置が含まれる場合にも適用できる。
【図面の簡単な説明】
【図１】本発明の実施形態を示す輸送量検出制御装置のブロック構成図。
【図２】コンベア輸送システムの例。
【図３】コンベアスケールＣＳの例。
【図４】コンベアスケールＣＳを中間コンベアに設けた例。
【符号の説明】
１…コンベア
２…ロードセル
３…速度検出器
４…ＣＳ演算部
５…輸送量検出制御装置
Ａ〜Ｅ…コンベア
ＣＳ…コンベアスケール[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a conveyor transport system that connects a plurality of belt conveyors and transports particulates such as cement and coke, and more particularly to a transport amount detection device for transporting a predetermined transport amount.
[0002]
[Prior art]
This type of conveyor transport system is configured, for example, as shown in FIG. The A conveyor to the E conveyor are connected, and the goods taken in at the leading A conveyor position are transported in the order of A → B → C → D → E, and are carried into the destination F from the final E conveyor. The operation / stop control of each of the conveyors A to E is performed by starting the operation in the order of the conveyors E to A, thereby preventing the transported goods from being congested on the conveyors, and detecting the transportation of the conveyors A to E by detecting the transportation of the planned transportation amount. Stopping the operation in order prevents the cargo from remaining on the conveyor.
[0003]
Here, a conveyor scale CS is usually often used for the transport amount detection device (for example, see Patent Document 1 or Patent Document 2). As shown in FIG. 3, the conveyor scale CS detects the weight W (unit: kg) of the conveyed goods whose position is conveyed by the load cell 2 attached to the lower part of the conveyor 1 and engages with the conveyor 1. The speed detector 3 detects the transport speed V (unit: m / s) of the conveyor, and the CS calculation unit 4 calculates the instantaneous transport amount (unit: kg · m / s) by multiplying the two. By the time integration of (1), pulse signals of a number proportional to the transport amount (unit: kg · m) are obtained. For example, one pulse is output when the transport amount reaches 1000 kg · m. When using this conveyor scale CS, a value corresponding to the scheduled transport volume is preset in a counter, the counter is counted down by an output pulse from the conveyor scale CS, and when the value reaches 0, the scheduled transport volume is reduced. A timing signal can be obtained indicating that it has been reached. To control the scheduled transport amount, a conveyor stop command is issued at a timing of the counter of 0.
[0004]
When the speed detector 3 has a pulse pickup configuration, the number of pulses generated is proportional to the transport speed V (unit: number of pulses / second). Then, the CS calculation unit 4 calculates the transport speed V by counting the number of pulses per unit time.
[0005]
[Patent Document 1]
JP-A-10-291632
[Patent Document 2]
JP-A-7-101552
[Problems to be solved by the invention]
In the above-mentioned conveyor transport system, the conveyor scale CS is often not installed at the A conveyor position serving as a starting point. This is the case of a system in which the conveyor scale CS cannot be attached to the A conveyor that is the starting point due to mechanical restrictions of the system. In addition, installing the conveyor scale CS on the E conveyor side at the end point downstream of the transported goods enables accurate detection of the planned transport volume even if "load spill" occurs on an intermediate conveyor such as C conveyor. It may be a system that does it.
[0008]
As described above, in the case of a system in which the conveyor scale CS is attached to the conveyor downstream of the A conveyor that is the starting point, as described above, the counter is counted down by the pulse output from the conveyor scale CS, so that the expected transport amount is reduced. In the method of detecting the arrival, a large deviation from the actual target transport amount occurs.
[0009]
For example, as shown in FIG. 4, when the conveyor scale CS is provided on the C conveyor, if the conveyors CS are stopped in the order of the A conveyor and the E conveyor at the timing when the expected transport amount is detected by the conveyor scale CS, the A conveyor and the B conveyor are stopped. The above-mentioned transported goods are transported to the end point, and in this case, the transport destination F is carried in in excess of the scheduled transport amount.
[0010]
In this case, the expected transport amount PK (unit: kg · m), the constant K1 (unit: kg · m) corresponding to the loading amount of the A conveyor and the B conveyor, and the following calculation in anticipation of this constant K1,
[0011]
(Equation 2)
(PK-K1) -Number of generated pulses of the conveyor scale CS = 0
When the conveyor stop command is generated at the timing 0 when the condition is satisfied, the transport of the scheduled transport amount PK including the loading amounts of the A conveyor and the B conveyor can be performed.
[0012]
However, if the actual loading amounts of the A conveyor and the B conveyor deviate from the constant K1, the planned transport amount becomes insufficient or excessive.
[0013]
SUMMARY OF THE INVENTION An object of the present invention is to provide a conveyor transport system capable of transporting with accurately detecting a transport amount in a system configuration in which a conveyor scale CS is installed at an intermediate position of an articulated conveyor.
[0014]
[Means for Solving the Problems]
The present invention, in order to solve the above-mentioned problems, to detect 0 timing that approached the planned transport volume including the loading capacity of the conveyor on the upstream side of the conveyor on which the conveyor scale is installed, at the time of this detection, the upstream conveyor Is estimated from the average value of the instantaneous transport volume, the transport speed, and the length of the conveyor on the conveyor equipped with the conveyor scale, and based on this predicted value, the remaining operating time of the conveyor required after detecting 0 timing is calculated. A conveyor stop command is obtained after the operation time, or a conveyor stop command is obtained when the remaining operation time 0 is detected, and is characterized by the following configuration.
[0015]
(1) A transported object is transported by a predetermined transport amount by a plurality of connected conveyors, and a load cell for detecting the weight of the transported item at the position on the intermediate conveyor; a speed detector for detecting a transport speed; And a transport volume detection control means for detecting that the transport volume obtained based on the instantaneous transport volume calculated from the detected value of the transport speed has reached the scheduled transport volume and obtaining a conveyor stop command. hand,
The transport amount detection control means,
0 timing detection unit that detects that the transport amount including the load amount of the conveyor on the upstream side of the conveyor on which the load cell and the speed detector are installed approaches the scheduled transport amount,
At the time of detection of the 0 timing, a loading amount calculation unit that predicts the loading amount of the upstream conveyor from the instantaneous transport amount and the conveyor length,
A remaining operation time calculation unit for obtaining a remaining operation time of the conveyor from the time of the detection of the 0 timing based on the estimated load amount of the upstream conveyor,
A timer counting unit for obtaining a conveyor stop command after the remaining operation time from the detection of the zero timing.
[0016]
(2) A transported object is transported by a predetermined transport amount by a plurality of connected conveyors, and a load cell for detecting the weight of the transported item at the position on the intermediate conveyor; a speed detector for detecting a transport speed; And a transport volume detection control means for detecting that the transport volume obtained based on the instantaneous transport volume calculated from the detected value of the transport speed has reached the scheduled transport volume and obtaining a conveyor stop command. hand,
The transport amount detection control means,
0 timing detection unit that detects that the transport amount including the load amount of the conveyor on the upstream side of the conveyor on which the load cell and the speed detector are installed approaches the scheduled transport amount,
A loading amount calculation unit that predicts the loading amount of the upstream conveyor from the instantaneous transport amount and the conveyor length,
After the detection of the 0 time, repeated predictions loading amount by the loading amount calculating unit, the estimated time t _1, t 2, _..., the following equation for each t _N,
[0017]
[Equation 3]
K−Q _N −ΔQ = 0
However,
K is a loading constant of the upstream conveyor which is set when 0 timing is detected,
Q _N is loading amount prediction value determined respectively by the prediction time _t 1 ~t _N,
ΣQ is the total value of the transport amounts obtained at the predicted times t _{1 to} t _N ,
And an arithmetic means for obtaining a conveyor stop command when the arithmetic expression is satisfied.
[0018]
(3) The 0-timing detection unit calculates a value obtained by subtracting a constant K1 set as the load of the upstream conveyor and a load margin constant K2 as a positive / negative error of the constant K1 from the expected transport PK. It is characterized in that the zero timing is detected when the transport amount obtained from the transport speed and the instantaneous transport amount has been reached.
[0019]
(4) A moving average calculation unit is provided, in which the average transportation amount obtained by performing a moving average operation on the instantaneous transportation amount obtained from the weight and the transportation speed is used as the instantaneous transportation amount in the load operation unit.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a block diagram of a transport amount detection control device according to an embodiment of the present invention. The conveyor transportation system is a case of a conveyor transportation system in which A to E conveyors are connected and transport a transported object to a destination F by a predetermined amount, and a conveyor scale CS is installed at a C conveyor position, as in FIG.
[0021]
In the conveyor scale CS, as in the conventional case, the load cell 2 detects the weight W (unit: kg) of the conveyed object at the position, and the speed detector 3 detects the conveyor speed V (unit: m / s). Is detected as the number of pulses per unit time. The CS calculation unit 4 integrates the instantaneous transport amount (unit: kg · m / s) obtained from the product of the weight and the speed to obtain pulse signals of a number proportional to the transport amount (unit: kg · m). For example, one pulse is generated every time the transport amount reaches 1000 kg · m.
[0022]
The transport volume detection control device 5 detects the timing at which the planned transport volume can be transported by the following sequence processing means S1 to S5 which is configured by software, and issues a conveyor stop command upon this detection.
[0023]
After the start of transportation, the 0 timing detection unit S1 calculates a planned transportation amount PK (unit: kg · m), a constant K1 (unit: kg · m) to be predicted and set as a loading amount of the A conveyor and the B conveyor, and furthermore, a loading margin. Using the constant K2 (unit: kg · m), 0 timing is obtained by the following subtraction formula.
[0024]
(Equation 4)
(PK−K1−K2) −Number of generated pulses of CS operation unit = 0
At this 0 timing, it is detected that the transport volume up to the present has reached near the scheduled transport volume PK by including the payload margin constant K2 in addition to the payload constant K1 of the A conveyor and the B conveyor.
[0025]
Here, if the conveyor operation is stopped at zero timing, the difference (positive or negative) between the actual load amount on the A and B conveyors and the constant K1 causes shortage or excess of the transport amount. In order to correct the difference in either case of the shortage or the excess, zero timing including the load margin constant K2 is detected.
[0026]
The moving average calculation unit S2 calculates the instantaneous transport amount (unit: kg · m / s) from the weight detected by the load cell 2 and the transport speed detected by the speed detector 3, executes the moving average calculation, and calculates The average transport amount Q (kg · m / s) at the time of detecting the timing is obtained. The average transport quantity Q is the average transport quantity of the transported articles loaded on the C conveyor, but also the predicted average transport quantity of the transported articles loaded on the A and B conveyors. Note that the moving average calculation is a repetition of sampling the value of the instantaneous transport amount to be obtained at a constant cycle, and dividing the sample value from the present to N samples in the past by N.
[0027]
A, B loading calculation unit S3 is the average transport volume Q and A, Captain L _A and B the _conveyor, from L B (pulse count of the pulse pick-up 3 per unit time) _(default) and conveyor transport speed V , a at 0 timing detected by the following equation, loading amount prediction value _Q a and B conveyors, _{Q B} (unit: kg · m) is determined.
[0028]
(Equation 5)
Q _A = Q × L _A / V
_{_{Q B = Q × L B /}} V
Note that the exact loading amount calculation, C conveyor scale loading amount on C conveyor with captain L _C of CS to the position _{_{Q C (= Q × L C}} / V) of the conveyor is also preferably included.
[0029]
The remaining operating time calculation unit S4 is 0 and constant K1, K2 subjected to detection of the timing detection unit S1, A, loading amount prediction value Q _A and B _conveyors, it obtains a difference between the Q _B, the average transport volume Q of this Then, the remaining operation time T (unit: second) until the conveyor stop control is obtained by dividing by.
[0030]
(Equation 6)
_{T = ((K1 + K2)} - (Q A + Q B)) / Q
The timer counting unit S5 issues a conveyor stop command when the time T has been reached by a timer process in which the remaining operation time T is set.
[0031]
Therefore, the conveyor stop command is issued after T time from the detection timing of the 0 timing detection unit S1, and the conveyor stop control that accurately detects the loading of the A and B conveyors and eliminates the shortage / excess of the transport amount can be performed.
[0032]
In the embodiment, the case where the moving average calculation is performed only once at the time of detecting the 0 timing to obtain the average transport amount Q and the remaining operation time T is calculated based on the moving average calculation Q is shown. At each time t ₁ , t ₂ ,..., T _N
[0033]
(Equation 7)
K−Q _N −ΔQ = 0
However,
_{K = (K1 + K2),} Q N = (Q AN + Q BN)
ΣQ is the total value of the transport amounts Q _{1 to} Q _N obtained at times t _{1 to} t _N ,
Q _AN and Q _BN are the estimated load values of the A and B conveyors obtained at times t _{1 to} t _N , respectively.
Is repeated, and a conveyor stop command can be obtained when this equation is satisfied. In this case, even when the loading amounts of the A and B conveyors change depending on the position of the conveyors, high-accuracy transportation in which these changes are corrected can be performed.
[0034]
In the embodiment, the case where the conveyor scale CS is installed on the C conveyor is shown. However, the same operation can be performed when the conveyor scale CS is installed on the B conveyor, the D conveyor, or the E conveyor.
[0035]
【The invention's effect】
As described above, according to the present invention, 0 timing is detected as approaching the scheduled transport volume including the loaded volume of the conveyor on the upstream side of the conveyor on which the conveyor scale is installed, and the loading of the upstream conveyor is detected at this detection. The amount is predicted from the average value of the instantaneous transport volume, the transport speed, and the length of the conveyor on the conveyor equipped with a conveyor scale. Since the conveyor stop command is obtained later or the conveyor stop command is obtained when the remaining operation time 0 is detected, the transport amount in the system in which the conveyor scale CS is installed at the intermediate position is accurately detected, and the scheduled transport is performed. The quantity can be transported accurately.
[0036]
Note that the processing function of a normal sequencer can be used as the CS operation element, and can be easily realized without using any special control means. In addition, the present invention can be applied to a case where a device such as a damper is included in the middle of the connecting conveyor.
[Brief description of the drawings]
FIG. 1 is a block diagram of a transport amount detection control device according to an embodiment of the present invention.
FIG. 2 shows an example of a conveyor transportation system.
FIG. 3 shows an example of a conveyor scale CS.
FIG. 4 is an example in which a conveyor scale CS is provided on an intermediate conveyor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Conveyor 2 ... Load cell 3 ... Speed detector 4 ... CS operation part 5 ... Transportation amount detection control device A-E ... Conveyor CS ... Conveyer scale

Claims

A load is transported by a plurality of linked conveyors by a predetermined transport amount, and the intermediate conveyor detects a weight of the transported material at the position, a load cell that detects a transport speed, a speed detector that detects a transport speed, and the weight and transport speed. A conveyor transport system comprising transport amount detection control means for detecting that the transport amount obtained based on the instantaneous transport amount calculated from the detected value has reached the scheduled transport amount and obtaining a conveyor stop command,
The transport amount detection control means,
0 timing detection unit that detects that the transport amount including the load amount of the conveyor on the upstream side of the conveyor on which the load cell and the speed detector are installed approaches the scheduled transport amount,
At the time of detection of the 0 timing, a loading amount calculation unit that predicts the loading amount of the upstream conveyor from the instantaneous transport amount and the conveyor length,
A remaining operation time calculation unit for obtaining a remaining operation time of the conveyor from the time of the detection of the 0 timing based on the estimated load amount of the upstream conveyor,
A conveyor timer for obtaining a conveyor stop command after the remaining operation time from the detection of the zero timing.

A load is transported by a plurality of linked conveyors by a predetermined transport amount, and the intermediate conveyor detects a weight of the transported material at the position, a load cell that detects a transport speed, a speed detector that detects a transport speed, and the weight and transport speed. A conveyor transport system comprising transport amount detection control means for detecting that the transport amount obtained based on the instantaneous transport amount calculated from the detected value has reached the scheduled transport amount and obtaining a conveyor stop command,
The transport amount detection control means,
0 timing detection unit that detects that the transport amount including the load amount of the conveyor on the upstream side of the conveyor on which the load cell and the speed detector are installed approaches the scheduled transport amount,
A loading amount calculation unit that predicts the loading amount of the upstream conveyor from the instantaneous transport amount and the conveyor length,
After the detection of the 0 time, repeated predictions loading amount by the loading amount calculating unit, the estimated time t _1, t 2, _..., the following equation for each t _N,

However,
K is a loading constant of the upstream conveyor which is set when 0 timing is detected,
Q _N is loading amount prediction value determined respectively by the prediction time _t 1 ~t _N,
ΣQ is the total value of the transport amounts obtained at the predicted times t _{1 to} t _N ,
And a calculation means for obtaining a conveyor stop command when the calculation formula is satisfied.

The 0-timing detection unit calculates a value obtained by subtracting a constant K1 set as the load of the upstream conveyor and a load margin constant K2 as a positive / negative error component of the constant K1 from the planned transport PK. The conveyor transportation system according to claim 1 or 2, wherein when the transportation amount obtained from the instantaneous transportation amount is reached, zero timing is detected.

4. The moving average calculator according to claim 1, further comprising a moving average calculator configured to set an average transport amount obtained by performing a moving average calculation on the instantaneous transport amount obtained from the weight and the transport speed as an instantaneous transport amount in the load calculator. The conveyor transport system according to claim 1 or 2.