JP2012078335A - Powder flow rate detector - Google Patents

Powder flow rate detector Download PDF

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JP2012078335A
JP2012078335A JP2010236885A JP2010236885A JP2012078335A JP 2012078335 A JP2012078335 A JP 2012078335A JP 2010236885 A JP2010236885 A JP 2010236885A JP 2010236885 A JP2010236885 A JP 2010236885A JP 2012078335 A JP2012078335 A JP 2012078335A
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light
receiving element
flow rate
output
light receiving
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Yoshio Hayashi
美志夫 林
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Abstract

PROBLEM TO BE SOLVED: To provide a powder flow rate detector which includes another light receiving element for directly receiving light of a light source, generates a reference voltage of a comparator from the output of the light receiving element, and accordingly hardly generates an error, in a method of detecting a powder flow rate by irradiating moving powder with light of the light source, and receiving the light having passed through the powder in a light receiving element.SOLUTION: The powder flow rate detector which includes a light source 2, a first light receiving element 7 for directly receiving light of the light source and a second light receiving element 3 for receiving the light of the light source having passed through a moving powder 6 includes a comparator 4 for comparing the output of voltage-dividing means 5 for dividing the output of the first light receiving element 7 to the output of the second light receiving element 3.

Description

この発明は、植毛塗装に用いられる粉体塗装機の吐出量制御に必要な粉体流量検出器に関するものである。  The present invention relates to a powder flow rate detector necessary for controlling the discharge amount of a powder coating machine used for flocking coating.

従来の構成を図２に示す。電源１には電池や安定化電源等が使われる。光源２には電球、蛍光灯、ＬＥＤ等が使われる。受光素子３には光ダイオード、光トランジスタ、硫化カドミウム（ＣｄＳ）セル、ソーラーパネル等が使われるが、何れの場合も出力電圧Ｖｓが入射光強度に応じて大きくなる形態で使うものとする。  A conventional configuration is shown in FIG. As the power source 1, a battery, a stabilized power source or the like is used. For the light source 2, a light bulb, a fluorescent lamp, an LED, or the like is used. As the light receiving element 3, a photodiode, a phototransistor, a cadmium sulfide (CdS) cell, a solar panel, or the like is used. In any case, the output voltage Vs is used in a form that increases in accordance with the incident light intensity.

電源１の出力Ｖｐによって光源２が駆動され、光源２の発生光は移動する粉体６を透過して受光素子３に到達する。受光素子３の発生電圧Ｖｓは比較器４の例えば負極端子に入力される。一方、電源出力Ｖｐは分圧手段５を介して分圧電圧Ｖｒとされて比較器４の例えば正極端子に入力される。The light source 2 is driven by the output Vp of the power source 1, and the light generated by the light source 2 passes through the moving powder 6 and reaches the light receiving element 3. The voltage Vs generated by the light receiving element 3 is input to, for example, the negative terminal of the comparator 4. On the other hand, the power supply output Vp is made a divided voltage Vr through the voltage dividing means 5 and inputted to the positive terminal of the comparator 4, for example.

受光素子３の出力Ｖｓは移動粉体６が無いときに最大電圧となり、移動粉体量（時間平均すると流量）が増えるにつれて透過光が減衰して下がることは明らかである。従って、比較器４の状態は例えば以下の３通りに限定される。
Ｖｓ＞Ｖｒのとき比較出力はＬｏ（粉体流量が規定値未満）
Ｖｓ＝Ｖｒのとき比較出力はＨｉ（粉体流量が規定値）
Ｖｓ＜Ｖｒのとき比較出力はＨｉ（粉体流量が規定値より大）
これらから、例えば比較出力がＨｉのときにＬＥＤ等を点灯させることで粉体流量が規定値未満かあるいは以上かを判別させて検出器とすることができる。なお、規定値を決める分圧電圧Ｖｒは次式で定義される。なお、Ｖｐ＞Ｖｓを条件とする。
Ｖｒ＝Ｖｐ×Ｒ１／（Ｒ１＋Ｒ２） （１）It is clear that the output Vs of the light receiving element 3 becomes the maximum voltage when there is no moving powder 6, and the transmitted light attenuates and decreases as the amount of moving powder (flow rate when averaged over time) increases. Therefore, the state of the comparator 4 is limited to the following three types, for example.
When Vs> Vr, the comparison output is Lo (powder flow rate is less than the specified value)
When Vs = Vr, the comparison output is Hi (powder flow rate is the specified value)
When Vs <Vr, the comparison output is Hi (powder flow rate is greater than the specified value)
From these, for example, by turning on an LED or the like when the comparison output is Hi, it is possible to determine whether the powder flow rate is less than or equal to a specified value and to make a detector. The divided voltage Vr that determines the specified value is defined by the following equation. Note that Vp> Vs.
Vr = Vp × R1 / (R1 + R2) (1)

従来方法には次のような欠点があった。
（イ）周囲温度や経年で光源２の発光強度が変化する恐れがあり、それは受光素子３の発生電圧Ｖｓを変化させて流量の検出に誤差を発生させる。特に寿命品である電球を使った場合は顕著である。
（ロ）電源１の出力Ｖｐが変化した場合は光源２の発光強度と分圧電圧Ｖｒが変化する。互いの変化方向は影響を打ち消し合う方向なので好ましいが、その程度を揃えて完全に相殺させるのは難しい。Ｖｒは前記（１）式で決まるが、Ｖｓは光源２を経由するからである。電源１に電池を使用したときに本欠点が顕著である。
本発明は、以上のような欠点を解消するために為されたものである。The conventional method has the following drawbacks.
(A) The light emission intensity of the light source 2 may change depending on the ambient temperature or aging, which causes an error in detecting the flow rate by changing the generated voltage Vs of the light receiving element 3. This is particularly noticeable when using a light bulb that has a limited life.
(B) When the output Vp of the power source 1 changes, the emission intensity of the light source 2 and the divided voltage Vr change. The directions of mutual change are preferable because they cancel out the influences, but it is difficult to completely cancel out the same degree. This is because Vr is determined by the equation (1), but Vs passes through the light source 2. This defect is remarkable when a battery is used for the power source 1.
The present invention has been made to eliminate the above-described drawbacks.

光源２を設け、光源光を直接受光する第１受光素子７と、移動粉体６を透過した光源光を受光する第２受光素子３とを設け、第１受光素子７の出力を分圧する分圧手段５の出力と第２受光素子３の出力とを比較する比較器４を設けた粉体流量検出器。  A light source 2 is provided, and a first light receiving element 7 that directly receives the light source light and a second light receiving element 3 that receives the light source light that has passed through the moving powder 6 are provided to divide the output of the first light receiving element 7. A powder flow rate detector provided with a comparator 4 for comparing the output of the pressure means 5 and the output of the second light receiving element 3.

（イ）第１受光素子７と第２受光素子３に同じ規格の受光素子を用いることにより、光源２に発光強度の変化が起きた場合は各出力Ｖｕ及びＶｓに同じ割合の変化をもたらすことは明らかである。すなわち、Ｖｓが１／２に変化したときはＶｕも１／２となり、それは前記（２）式を通じてＶｖも１／２となるので、流量の検出においては誤差の原因とならなくなる。従って、光源の種類の選択に制約がなくなり、さらに精度の高い流量の検出を可能にする効果がある。
（ロ）電源１の出力Ｖｐが変化した場合は、明らかに光源２の発光強度が変化するだけであり、それは前記（イ）の課題に帰着することになり、効果は同様である。この効果により、電源１に電池を採用しても良い自由度を得る。(A) By using light receiving elements of the same standard for the first light receiving element 7 and the second light receiving element 3, when the light emission intensity changes in the light source 2, the outputs Vu and Vs are changed in the same ratio. Is clear. That is, when Vs changes to ½, Vu also becomes ½, and Vv also becomes ½ through the above equation (2), so that it does not cause an error in detecting the flow rate. Therefore, there is no restriction on the selection of the type of light source, and there is an effect that enables detection of a flow rate with higher accuracy.
(B) When the output Vp of the power source 1 changes, only the emission intensity of the light source 2 obviously changes, which results in the problem (a), and the effect is the same. Due to this effect, a degree of freedom in which a battery may be adopted as the power source 1 is obtained.

発明の構成を図１に示す。電源１の出力Ｖｐは光源２に供給され、また図示されていないが比較器４にも供給される。第１受光素子７は光源２の発生光を直接受光して、発生した電圧Ｖｕを分圧手段５に出力する。第２受光素子３は移動粉体６を透過した光源光を受光して、発生した電圧Ｖｓを比較器４の例えば負極端子に入力する。分圧手段５は例えば抵抗器Ｒ１とＲ２の直列接続で構成され、その中点から分圧出力Ｖｖを出力し比較器４の例えば正極端子に入力する。分圧出力Ｖｖは以下の式で定義される。なおＶｕ＞Ｖｓを条件とする。
Ｖｖ＝Ｖｕ×Ｒ１／（Ｒ１＋Ｒ２） （２）The configuration of the invention is shown in FIG. The output Vp of the power source 1 is supplied to the light source 2 and is also supplied to the comparator 4 (not shown). The first light receiving element 7 directly receives the light generated by the light source 2 and outputs the generated voltage Vu to the voltage dividing means 5. The second light receiving element 3 receives the light source light transmitted through the moving powder 6 and inputs the generated voltage Vs to, for example, the negative terminal of the comparator 4. The voltage dividing means 5 is constituted by, for example, resistors R1 and R2 connected in series, and outputs a divided voltage output Vv from its middle point and inputs it to the positive terminal of the comparator 4, for example. The partial pressure output Vv is defined by the following equation. Note that Vu> Vs.
Vv = Vu × R1 / (R1 + R2) (2)

比較器４では以下２通りの判定が為される。
Ｖｓ＞Ｖｖのとき比較出力はＬｏ（粉体流量が規定値未満）
Ｖｓ＝Ｖｖ又はＶｓ＜Ｖｖのとき比較出力はＨｉ（粉体流量が規定値以上）The comparator 4 makes the following two determinations.
When Vs> Vv, the comparison output is Lo (powder flow rate is less than the specified value)
When Vs = Vv or Vs <Vv, the comparison output is Hi (powder flow rate is more than the specified value)

比較出力がＨｉのときに例えばＬＥＤを点灯させれば、粉体流量が規定値付近か目視で判断できる。また、分圧手段５内の抵抗器Ｒ１、Ｒ２の何れかを可変抵抗とすることで、流量規定値を連続可変にすることができる。更に、比較出力を負帰還ループの誤差信号として用いて、大本の粉体送り量を制御すれば、規定値付近で流量が安定化する自動調節制御が実現できる（関連特許 識別番号 ３１００２０３７８）。  If, for example, the LED is turned on when the comparison output is Hi, it can be visually determined whether the powder flow rate is near a specified value. Moreover, the flow rate regulation value can be made continuously variable by making any one of the resistors R1 and R2 in the voltage dividing means 5 a variable resistor. Further, if the comparison output is used as an error signal of the negative feedback loop to control the large amount of powder feed, automatic adjustment control that stabilizes the flow rate in the vicinity of the specified value can be realized (related patent identification number 310020378).

本発明の構成図である。  It is a block diagram of the present invention. 従来技術の構成図である。  It is a block diagram of a prior art.

１ 電源
２ 光源
３ 第２受光素子（図１）、受光素子（図２）
４ 比較器
５ 分圧手段
６ 移動粉体
７ 第１受光素子DESCRIPTION OF SYMBOLS 1 Power supply 2 Light source 3 2nd light receiving element (FIG. 1), light receiving element (FIG. 2)
4 comparator 5 partial pressure means 6 moving powder 7 first light receiving element

Claims (1)

光源２を設け、光源光を直接受光する第１受光素子７と、移動粉体６を透過した光源光を受光する第２受光素子３とを設け、第１受光素子７の出力を分圧する分圧手段５の出力と第２受光素子３の出力とを比較する比較器４を設けた粉体流量検出器。  A light source 2 is provided, and a first light receiving element 7 that directly receives the light source light and a second light receiving element 3 that receives the light source light that has passed through the moving powder 6 are provided to divide the output of the first light receiving element 7. A powder flow rate detector provided with a comparator 4 for comparing the output of the pressure means 5 and the output of the second light receiving element 3.
JP2010236885A 2010-10-04 2010-10-04 Powder flow rate detector Pending JP2012078335A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013052239A1 (en) * 2011-10-06 2013-04-11 Nordson Corporation Powder flow detection

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013052239A1 (en) * 2011-10-06 2013-04-11 Nordson Corporation Powder flow detection
US8767214B2 (en) 2011-10-06 2014-07-01 Nordson Corporation Powder flow detection
JP2014528584A (en) * 2011-10-06 2014-10-27 ノードソン コーポレーションＮｏｒｄｓｏｎ Ｃｏｒｐｏｒａｔｉｏｎ Powder flow detection
US9372108B2 (en) 2011-10-06 2016-06-21 Nordson Corporation Powder flow detection
EP3859286A1 (en) * 2011-10-06 2021-08-04 Nordson Corporation Powder flow detection

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