JPH0451770B2 - - Google Patents
Info
- Publication number
- JPH0451770B2 JPH0451770B2 JP57175985A JP17598582A JPH0451770B2 JP H0451770 B2 JPH0451770 B2 JP H0451770B2 JP 57175985 A JP57175985 A JP 57175985A JP 17598582 A JP17598582 A JP 17598582A JP H0451770 B2 JPH0451770 B2 JP H0451770B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- weighing
- weighed
- zero point
- outputs
- 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 - Lifetime
Links
- 238000005303 weighing Methods 0.000 claims description 46
- 238000001514 detection method Methods 0.000 claims description 9
- 238000012935 Averaging Methods 0.000 claims description 3
- 230000002238 attenuated effect Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G11/00—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers
- G01G11/006—Special taring or checking devices therefor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Sorting Of Articles (AREA)
Description
【発明の詳細な説明】
この説明は、被計量物を搬送しつつ計量して零
点補正をした重量信号を出力する重量選別装置に
関する。DETAILED DESCRIPTION OF THE INVENTION This description relates to a weight sorting device that weighs an object while conveying it and outputs a zero point corrected weight signal.
この種の重量選別装置は選別能率を向上させる
ために、第１図に示すように、助走コンベア１に
よつて供給された被計量物Ｗを、順次秤量コンベ
ア２によつて搬送しつつ、この搬送中に計量器３
で計量して、選別コンベア４へと搬送して重量選
別を行つている。 In order to improve sorting efficiency, this type of weight sorting device sequentially transports the objects to be weighed W supplied by an approach conveyor 1 to a weighing conveyor 2, as shown in FIG. Weighing device 3 during transportation
The materials are weighed and transported to a sorting conveyor 4 for weight sorting.
しかして、この重量選別装置では、計量器３の
計量信号が、計量動作中に時間経過に伴つて、温
度変化、あるいは被計量物の水分、粉末などの付
着などの原因で、変動することがあり、常に零点
補正を行う必要がある。 However, in this weight sorting device, the weighing signal from the scale 3 may fluctuate over time during the weighing operation due to temperature changes or adhesion of moisture, powder, etc. to the weighing object. Yes, it is necessary to always perform zero point correction.
このため、第１図に示すように被計量物Ｗを適
当な間隔をおいて送つて、１個被計量物Ｗが秤量
コンベア２を去るごとに、秤量コンベア２に被計
量Ｗがない空の状態にし、この被計量物なしの空
の状態になる度に、計量器３の計量信号の零から
のドリフト分を検出して零点補正を行つている。
（なお第１図中５，６，７はそれぞれ助走コンベ
ア１、秤量コンベア２、選別コンベア４の駆動モ
ータ、８は一対の投受光素子から成る被計量物の
通過を検出する位置検出器である。）
しかるに、前記計量信号は、被計量物Ｗが秤量
コンベア２から選別コンベア４へ移つて空になつ
た後も、計量器３のダンピング理象によつて長い
時間減衰振動する。 For this reason, as shown in FIG. 1, the objects to be weighed W are sent at appropriate intervals, and each time one object to be weighed W leaves the weighing conveyor 2, the weighing conveyor 2 is empty. Each time the measuring instrument 3 enters this empty state with no object to be weighed, the drift of the weighing signal from the weighing instrument 3 from zero is detected and zero point correction is performed.
(In Fig. 1, 5, 6, and 7 are drive motors for the run-up conveyor 1, weighing conveyor 2, and sorting conveyor 4, respectively, and 8 is a position detector that detects the passage of objects to be weighed, which is composed of a pair of light emitting and receiving elements. ) However, even after the object to be weighed W has been transferred from the weighing conveyor 2 to the sorting conveyor 4 and becomes empty, the weighing signal continues to oscillate attenuated for a long time due to the damping principle of the weighing device 3.
このため従来では、零点補正のためのドリフト
分を検出するには、被計量物Ｗが去つて空になつ
た後、この減衰振動がなくなるまで、次の被計量
物Ｗが秤量コンベア２に供給されないように、被
計量物の供給間隔を大にしなければならないた
め、選別能率を下げる結果となつていた。 For this reason, conventionally, in order to detect the drift amount for zero point correction, after the object to be weighed W has left and is empty, the next object to be weighed W is supplied to the weighing conveyor 2 until this damped vibration disappears. In order to prevent this, the interval between feeding objects to be weighed must be increased, which results in a decrease in sorting efficiency.
本発明は上記の欠点を改め、被計量物Ｗの供給
間隔をいたずらに大きくして選別能率を下げるこ
となしに、零点補正を正しく行えるようにした重
量選別装置を提供することを目的としている。 It is an object of the present invention to correct the above-mentioned drawbacks and provide a weight sorting device that can correctly perform zero point correction without reducing the sorting efficiency by unnecessarily increasing the supply interval of objects to be weighed.
以下、図面に示すこの発明の実施例について説
明する。 Embodiments of the invention shown in the drawings will be described below.
第２図はこの発明の一実施例による重量選別装
置の回路構成を示すブロツク図である。 FIG. 2 is a block diagram showing the circuit configuration of a weight sorting device according to an embodiment of the present invention.
第２図において、１１は秤量コンベア２で搬送
中の被計量物Ｗの重量を計量して計量信号を出力
する計量器、１２は計量信号を増幅する増幅器で
ある。 In FIG. 2, 11 is a weighing device that measures the weight of the object W being conveyed by the weighing conveyor 2 and outputs a weighing signal, and 12 is an amplifier that amplifies the weighing signal.
１３は、増幅器１２からの計量信号から高周波
成分を除去した、振動成分を含んだ信号（第３図
ａ）を出力する第１の低域フイルタである。 Reference numeral 13 denotes a first low-pass filter that removes high frequency components from the measurement signal from the amplifier 12 and outputs a signal containing vibration components (FIG. 3a).
１４は、第１の低域フイルタ１３の出力信号か
ら振動成分を除去し平滑化した信号（第３図ｂ）
を出力する第２の低域フイルタである。 14 is a signal obtained by removing the vibration component from the output signal of the first low-pass filter 13 and smoothing it (Fig. 3b)
This is a second low-pass filter that outputs .
１５は、被計量物Ｗが秤量コンベア２へ移行す
る時に出力される位置検出器８からの被計量物検
出信号（第３図ｃ）に基づいて、所定のタイミン
グでタイミングパルス（第３図ｄ）を出力するタ
イミング回路である。 15 generates a timing pulse (d in FIG. 3) at a predetermined timing based on an object detection signal (d in FIG. 3) from the position detector 8 outputted when the object W to be weighed moves to the weighing conveyor 2. ) is a timing circuit that outputs.
１６は、タイミング回路１５からのタイミング
パルスが出力された時点における、低域フイルタ
１４の出力信号の電圧（第３図ｂ参照）をＡ／Ｄ
変換するＡ／Ｄ変換器である。 Reference numeral 16 indicates the voltage of the output signal of the low-pass filter 14 (see FIG. 3b) at the time when the timing pulse from the timing circuit 15 is output.
This is an A/D converter that performs the conversion.
１７は、低域フイルタ１３からの振動成分を含
んだままの計量信号を、時分割でＶ／Ｆ変換する
Ｖ／Ｆ変換器である。即ち、第３図ａに示す振動
する信号を時分割でＶ／Ｆ変換して順次出力す
る。 Reference numeral 17 denotes a V/F converter that performs time-division V/F conversion on the measurement signal containing the vibration component from the low-pass filter 13. That is, the oscillating signal shown in FIG. 3a is time-divisionally V/F converted and sequentially output.
１８は、低域フイルタ１３からの出力信号と、
基準電圧設定器１９に設定された零点補正基準電
圧Ｖとを比較し、零点補正基準電圧Ｖを下回つて
いる場合（即ち、被計量物Ｗが秤量コンベア２に
存在しない場合）に検出信号（第３図ｅ）を出力
する検出回路である。 18 is the output signal from the low-pass filter 13;
It compares the zero point correction reference voltage V set in the reference voltage setter 19, and if it is lower than the zero point correction reference voltage V (that is, if the object to be weighed W is not present on the weighing conveyor 2), a detection signal ( This is a detection circuit that outputs the signal shown in FIG. 3e).
２０は、検出回路１８からの検出信号を受けて
いる間、Ｖ／Ｆ変換器１７の出力信号を通過させ
るゲート回路である。 20 is a gate circuit that allows the output signal of the V/F converter 17 to pass while receiving the detection signal from the detection circuit 18.
２１は、ゲート回路２０が開いている間Ｖ／Ｆ
変換器１７から順次出力される周波数信号を受領
して、この周波数を計数した計数値を出力する計
数回路である。 21 is V/F while the gate circuit 20 is open.
This is a counting circuit that receives frequency signals sequentially output from the converter 17 and outputs a count value obtained by counting the frequencies.
２２は、Ａ／Ｄ変換器１６から出力されるデイ
ジタル値を記憶すると共に、計数回路２１の計数
値を受けて、これを平均演算し、且つこの以前か
ら今回を含めたＮ回分の空状態での計算回路２１
の計数値の平均値を演算した値を零点として、前
記記憶したＡ／Ｄ変換器からのデイジタル値から
減算して、零点補正された重量信号として出力す
る演算回路である。 22 stores the digital value output from the A/D converter 16, receives the counted value of the counting circuit 21, calculates the average of this, and calculates the empty state for N times from before to this time. calculation circuit 21
This calculation circuit subtracts the average value of the counted values as a zero point from the stored digital value from the A/D converter, and outputs the result as a zero point corrected weight signal.
次に上記回路の動作を説明する。 Next, the operation of the above circuit will be explained.
助走コンベア１から被計量物Ｗが順次、秤量コ
ンベア２へ供給される。このとき位置検出器８に
よつて被計量物Ｗが供給されたことが検出され第
３図ｃのように検出回路が出力される。被計量物
Ｗは秤量コンベア２で搬送中に計量器１１で計量
される。 The objects to be weighed W are sequentially supplied from the run-up conveyor 1 to the weighing conveyor 2. At this time, the position detector 8 detects that the object to be weighed W has been supplied, and the detection circuit outputs an output as shown in FIG. 3c. The object to be weighed W is weighed by a weighing device 11 while being conveyed by a weighing conveyor 2.
計量器１１からの計量信号は、増幅器１２で増
幅され、第１の低域フイルタ１３で高周波成分が
除去される。この計量信号は、被計量物が秤量コ
ンベア２に供給された後、ダンピング現象で減衰
振動をし、被計量物が秤量コンベア２から選別コ
ンベア４へ移つた後も同様に減衰振動をしている
（第３図ａ）。 The weighing signal from the weighing device 11 is amplified by the amplifier 12, and the high frequency component is removed by the first low-pass filter 13. This weighing signal undergoes damped vibration due to a damping phenomenon after the object to be weighed is supplied to the weighing conveyor 2, and similarly damped vibration after the object to be weighed is transferred from the weighing conveyor 2 to the sorting conveyor 4. (Figure 3a).
この計量信号は、さらに第２の低域フイルタ１
４で振動成分を除去されて第３図ｂのように平滑
された信号になり、タイミング回路１５からのタ
イミングパルスでＡ／Ｄ変換器１６によりＡ／Ｄ
変換変換される。 This measurement signal is further passed through a second low-pass filter 1.
4, the vibration component is removed, resulting in a smoothed signal as shown in FIG.
Conversion Converted.
また、振動成分を含んだままの第１の低域フイ
ルタ１３からの計量信号は、Ｖ／Ｆ変換器１７へ
入力して時分割でＶ／Ｆ変換した周波数にされ
る。 Further, the measurement signal from the first low-pass filter 13 that still contains the vibration component is input to the V/F converter 17 and converted into a frequency that is subjected to V/F conversion in a time-division manner.
計量後、被計量物が秤量コンベア２に存在しな
い状態になると、第３図ａのロに示すように、出
力電圧は低下する。検出回路１８は、この出力電
圧がある基準電圧（零点補正基準電圧）Ｖ以下に
なると、ゲート回路２０へ検出信号（第３図ｅ）
を出力して、ゲート回路２０を開く。ゲート回路
２０が開いている間、Ｖ／Ｆ変換器１７からの周
波数信号は、順次計数回路２１に入力して計数さ
れ、デジタルの計数値として順次出力される。 After weighing, when the object to be weighed is no longer present on the weighing conveyor 2, the output voltage decreases as shown in FIG. 3a (b). When the output voltage becomes lower than a certain reference voltage (zero point correction reference voltage) V, the detection circuit 18 sends a detection signal to the gate circuit 20 (Fig. 3 e).
is output and the gate circuit 20 is opened. While the gate circuit 20 is open, the frequency signals from the V/F converter 17 are sequentially input to the counting circuit 21, counted, and sequentially output as digital counted values.
演算回路２２は、Ａ／Ｄ変換器１６からのデイ
ジタル値を記憶する。そして、計数回路２１の計
測値を受けて平均値化して零点値とすると共に、
空の状態の以前から今回を含むＮ回分の零点値を
平均演算し、前記記憶したＡ／Ｄ変換器１６のデ
イジタル値からこのＮ回分を平均化した零点を減
算して、零点補正された重量信号を出力する。 Arithmetic circuit 22 stores the digital value from A/D converter 16. Then, the measured value of the counting circuit 21 is received and averaged to obtain a zero point value, and
The zero point values of N times including the current time from before the empty state are averaged, and the zero points obtained by averaging these N times are subtracted from the digital value of the A/D converter 16 stored above to obtain the zero point corrected weight. Output a signal.
このように、秤量コンベア２から被計量物が選
別コンベア４へ移行した直後は、計量信号は第３
図ａのロに示すように減衰振動しているが、Ｖ／
Ｆ変換器１７で時分割で周波数に変換され、演算
回路２２で平均値化されるので、減衰振動中で
も、零点補正値信号を得ることができる。また被
計量物なしの個々の状態における振動成分を含ん
だ信号は、搬送される被計量物の間隔の長短のた
めに振動成分が異なり、また、ノイズも含まれて
いるため、１回の空状態での前記零点補正値に
は、バラツキが生じるが、この空状態での零点補
正値がＮ回分で平均演算されるので、１回ごとの
ノイズや振動成分の相違があつても性格な零点が
得られる。即ち、空状態での回数Ｎの合計の平均
の確立誤差は１／√となるから、個々のバラツ
キやノイズはほとんど問題とならない零点補正値
が、得られることになる。 In this way, immediately after the object to be weighed is transferred from the weighing conveyor 2 to the sorting conveyor 4, the weighing signal is
As shown in figure a, there is damped oscillation, but V/
Since the frequency is time-divisionally converted by the F converter 17 and averaged by the arithmetic circuit 22, a zero point correction value signal can be obtained even during damped vibration. In addition, the signals containing vibration components in each state without an object to be weighed have different vibration components depending on the length of the interval between the objects to be weighed, and also contain noise. There will be variations in the zero point correction value in this empty state, but since the zero point correction value in this empty state is averaged over N times, even if there are differences in noise or vibration components each time, the zero point will be correct. is obtained. That is, since the probability error of the average of the total number of times N in the empty state is 1/√, a zero point correction value can be obtained in which individual variations and noise are hardly a problem.
以上説明したように本発明の重量選別装置で
は、２段のフイルタ１３，１４を用いて、第１段
目のフイルタ１３の振動成分を含んだ信号を利用
して、１回の空状態ごとに被計量物が去つて未だ
減衰振動が治まらない状態で、この振動成分を含
んだ信号レベルを平均化し、且つ、Ｎ回の空状態
での値を平均化演算して、１回ごとの空状態での
信号のノイズや振動成分のバラツキがあつてもこ
れと無関係な正しい零点値を得られるようにし
て、振動成分が除去された平滑化された第２のフ
イルタ１４の出力信号から、零点補正前の重量値
を取り出して、この重量値から前記Ｎ回平均化し
た振動中の信号から得た正しい零点を、減算する
ようにしたから、被計量物が秤量コンベアから去
つて空になつた際の計量信号の減衰振動が治まる
のを待つことなく零点検出及び補正が可能とな
り、従つて、零点補正のため被計量物の供給間隔
が小でもよいので、選別能率を下げることなく零
点補正をすることができる。 As explained above, in the weight sorting device of the present invention, the two-stage filters 13 and 14 are used, and the signal containing the vibration component of the first-stage filter 13 is used to After the object to be weighed has left and the damped vibration has not yet subsided, the signal level containing this vibration component is averaged, and the values in the empty state N times are averaged and computed to calculate the empty state for each time. The zero point correction is performed from the smoothed output signal of the second filter 14 from which the vibration component has been removed, so as to obtain a correct zero point value that is unrelated to the noise of the signal or the variation in the vibration component. Since the previous weight value is taken out and the correct zero point obtained from the signal during vibration averaged N times is subtracted from this weight value, when the object to be weighed leaves the weighing conveyor and becomes empty, It is possible to detect and correct the zero point without waiting for the damped oscillation of the weighing signal to subside. Therefore, the feeding interval of objects to be weighed may be short for zero point correction, so zero point correction can be performed without reducing sorting efficiency. be able to.
第１図は重量選別装置の機構部の概略構成図、
第２図は本発明の一実施例を示すブロツク図、第
３図は第２図の回路動作を説明するためのタイム
チヤートである。
１１……計量器、１３……低域フイルタ、１４
……低域フイルタ、１７……Ｖ／Ｆ変換器、２２
……演算回路。
Figure 1 is a schematic diagram of the mechanical part of the weight sorting device;
FIG. 2 is a block diagram showing one embodiment of the present invention, and FIG. 3 is a time chart for explaining the operation of the circuit shown in FIG. 11...Measuring instrument, 13...Low pass filter, 14
...Low pass filter, 17...V/F converter, 22
...Arithmetic circuit.
Claims (1)
被計量物搬送中の状態から、該被計量物が秤量コ
ンベアを去り、次の被計量物が秤量コンベアで搬
送される間の空の状態へと連続的に変化し、且つ
空の状態へ変化した際に減衰振動する計量信号を
出力する計量器とを備え、被計量物を順次間隔を
おいて前記秤量コンベアに供給して、該空の時点
での前記計量信号に基づいて零点を検出して、零
点補正した重量値信号を出力する重量選別装置に
おいて、 前記計量信号から高周波成分を除去して振動成
分を含んだ信号を出力する第１の低域フイルタ
と、 前記第１の低域フイルタの出力信号から振動成
分を除去した信号を出力する第２の低域フイルタ
と、 前記秤量コンベアで搬送される被計量物の位置
を検出して秤量コンベアの空状態を一回ごとに検
出する位置検出装置と、 前記位置検出装置の出力に基づいて、前記秤量
コンベアの一回ごとの空状態での前記第１の低域
フイルタの前記振動成分を含んだ出力信号を平均
化した値を零点補正値として出力する零点補正値
出力回路と、 前記秤量コンベアでの１回の被計量物搬送ごと
の前記第２の低域フイルタを通過した出力信号に
基づく重量値から、前記零点補正値出力回路の零
点補正値のＮ回分を平均化した値を減算して該被
計量物の重量信号として出力する演算回路とを具
備することを特徴とする重量選別装置。[Scope of Claims] 1. A weighing conveyor; provided on the weighing conveyor, from a state in which an object to be weighed is being conveyed by the weighing conveyor, the object to be weighed leaves the weighing conveyor, and the next object to be weighed is conveyed by the weighing conveyor. and a weighing device that outputs a weighing signal that outputs a weighing signal that continuously changes to an empty state while being weighed and that oscillates attenuated when the state changes to the empty state, and the weighing conveyor In a weight sorting device that detects a zero point based on the weighing signal at the empty time and outputs a zero point corrected weight value signal, a high frequency component is removed from the weighing signal to remove a vibration component. a first low-pass filter that outputs a signal that contains a vibration component; a second low-pass filter that outputs a signal that removes vibration components from the output signal of the first low-pass filter; a position detection device that detects the position of the object to be weighed and detects the empty state of the weighing conveyor each time; a zero point correction value output circuit that outputs a value obtained by averaging the output signal including the vibration component of the low-pass filter as a zero point correction value; an arithmetic circuit that subtracts a value obtained by averaging N times of zero point correction values of the zero point correction value output circuit from a weight value based on an output signal that has passed through a low-pass filter, and outputs the result as a weight signal of the object to be weighed; A weight sorting device comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17598582A JPS5965222A (en) | 1982-10-06 | 1982-10-06 | Weight selecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17598582A JPS5965222A (en) | 1982-10-06 | 1982-10-06 | Weight selecting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5965222A JPS5965222A (en) | 1984-04-13 |
| JPH0451770B2 true JPH0451770B2 (en) | 1992-08-20 |
Family
ID=16005677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17598582A Granted JPS5965222A (en) | 1982-10-06 | 1982-10-06 | Weight selecting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5965222A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0765927B2 (en) * | 1986-07-11 | 1995-07-19 | 株式会社石田衡器製作所 | Weight measuring device |
| JP2640880B2 (en) * | 1991-02-25 | 1997-08-13 | 株式会社 イシダ | Weighing device |
| JP4668626B2 (en) * | 2005-01-13 | 2011-04-13 | 大和製衡株式会社 | Continuous scale |
| JP4781982B2 (en) * | 2006-12-06 | 2011-09-28 | アンリツ産機システム株式会社 | Weighing device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55104724A (en) * | 1979-02-06 | 1980-08-11 | Tokyo Electric Co Ltd | Method for zero adjusting of automatic weighing machine |
| JPS5641218B2 (en) * | 1978-05-24 | 1981-09-26 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6315790Y2 (en) * | 1979-04-23 | 1988-05-06 | ||
| JPS5641218U (en) * | 1979-09-10 | 1981-04-16 |
-
1982
- 1982-10-06 JP JP17598582A patent/JPS5965222A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5641218B2 (en) * | 1978-05-24 | 1981-09-26 | ||
| JPS55104724A (en) * | 1979-02-06 | 1980-08-11 | Tokyo Electric Co Ltd | Method for zero adjusting of automatic weighing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5965222A (en) | 1984-04-13 |
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