JP2977596B2 - Contact potential difference measuring device for powders - Google Patents
Contact potential difference measuring device for powdersInfo
- Publication number
- JP2977596B2 JP2977596B2 JP2270885A JP27088590A JP2977596B2 JP 2977596 B2 JP2977596 B2 JP 2977596B2 JP 2270885 A JP2270885 A JP 2270885A JP 27088590 A JP27088590 A JP 27088590A JP 2977596 B2 JP2977596 B2 JP 2977596B2
- Authority
- JP
- Japan
- Prior art keywords
- potential difference
- contact potential
- granular material
- electrode
- voltage
- 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 - Fee Related
Links
Landscapes
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、粉粒体の接触電位差測定装置に関するもの
である。Description: TECHNICAL FIELD The present invention relates to an apparatus for measuring a contact potential difference of a granular material.
（従来の技術） 粉粒体と金属が接触すると、その境界面に電位差が発
生する。この電位差は粉粒体の表面とそれに対向する金
属表面の状態によって異なる値を示す。(Prior Art) When the powder and the granular material come into contact with each other, a potential difference is generated at the boundary surface. This potential difference shows different values depending on the state of the surface of the granular material and the state of the metal surface opposed thereto.
粉粒体を処理する処理設備では、粉粒体が金属と接触
することによって発生する粉粒体の帯電などの電気現象
が生産障害の原因となっている。In a processing facility for processing a granular material, an electrical phenomenon, such as charging of the granular material, which is generated when the granular material comes into contact with a metal, causes a production failure.
従って、この接触によって起きる電気現象の１つであ
る接触電位差を測定することは、粉粒体の取扱にとって
大きな意味を持つ。Therefore, measuring the contact potential difference, which is one of the electrical phenomena caused by this contact, has a great significance for handling of the granular material.
従来２つの電極の間に接触電位差を測定しようとする
試料を挟んで、その一方の電極を振動させながら試料の
接触電位差を測定する装置が公知である（特開昭50−14
0067号公報）。2. Description of the Related Art Conventionally, there has been known an apparatus for measuring a contact potential difference between a sample and a sample whose contact potential difference is to be measured between two electrodes while vibrating one of the electrodes (Japanese Patent Application Laid-Open No. Sho 50-14).
No. 0067).
（解決されるべき課題） 本発明の課題は、簡単な操作により試料の接触電位差
を測定するための測定装置を案出することである。(Problem to be solved) An object of the present invention is to devise a measuring device for measuring a contact potential difference of a sample by a simple operation.
（課題の解決のための手段） 本発明の課題は、特許請求の範囲第１項及び第２項に
記載された発明特定事項、即ち、粉粒体（５）を２つの
電極（３、４）の間に挟んで、粉粒体（５）と電極表面
との間の接触電位差を測定するために、２つの電極
（３、４）を電圧可変電源（７）に接続する回路を形成
し、この回路に電流計（１）を装着するとともに、前記
電圧可変電源（７）の電圧を測定する電圧計（２）と、
前記２つの電極（３、４）の距離を変化させる振動機
（９）を備え、この振動機（９）を稼働させた際に前記
電流計（１）の測定値がゼロとなるように前記電圧可変
電源（７）の電圧を調節し、このときの電圧を前記電圧
計（２）で読み取ることにより接触電位差を求めるよう
にしたことを特徴とする前記粉粒体の接触電位差測定装
置、及び上部電極（３）及び下部電極（４）が、絶縁体
（６、６）を介して、それぞれその中心の電極（３、
４）と、その周辺の電極（10、10）とに分割されてい
る、請求項１に記載された、粉粒体の接触電位差測定装
置によって解決される。(Means for Solving the Problems) An object of the present invention is to specify the invention described in Claims 1 and 2, that is, to apply the powder (5) to two electrodes (3, 4). ), A circuit for connecting the two electrodes (3, 4) to the variable voltage power supply (7) is formed in order to measure the contact potential difference between the powder (5) and the electrode surface. A voltmeter (2) for mounting an ammeter (1) on the circuit and measuring the voltage of the voltage variable power supply (7);
A vibrator (9) for changing a distance between the two electrodes (3, 4), wherein the vibrator (9) is operated such that the measured value of the ammeter (1) becomes zero when the vibrator (9) is operated. A device for measuring the contact potential difference of the granular material, wherein a contact potential difference is obtained by adjusting the voltage of the voltage variable power supply (7) and reading the voltage at this time with the voltmeter (2); The upper electrode (3) and the lower electrode (4) are respectively connected to the central electrodes (3,
The problem is solved by the device for measuring a contact potential difference of a granular material according to claim 1, wherein the device is divided into 4) and a peripheral electrode (10, 10).
本発明によれば、特に粉粒体の接触電位差が簡単かつ
正確に測定されることができる。ADVANTAGE OF THE INVENTION According to this invention, especially the contact potential difference of a granular material can be measured simply and accurately.
次に本発明を、図示の実施例に基づいて詳しく説明す
る。Next, the present invention will be described in detail based on the illustrated embodiment.
（実施例） 第１図は、本発明による粉粒体の接触電位差測定装置
の第１実施例の基本的な構成を示す図である。(Embodiment) FIG. 1 is a view showing a basic configuration of a first embodiment of a contact potential difference measuring apparatus for a granular material according to the present invention.
試料としての被測定粉粒体５は、接触電位差を測定す
る下部電極４上に載せられている。この下部電極４は、
絶縁体６上に載せられている。この下部電極４は、絶縁
体６で電気的に他とは絶縁されて電流計１に接続されて
いる。The measurement target granular material 5 is placed on the lower electrode 4 for measuring a contact potential difference. This lower electrode 4
It is mounted on the insulator 6. The lower electrode 4 is electrically insulated from the others by an insulator 6 and connected to the ammeter 1.
下部電極４に対向して上部電極３は、絶縁体６で他と
絶縁され、対向する距離を調整できるように可動軸11の
部分で保持金具８に支えられている。可動軸11は、図示
しないフレームにより装置架台又は保持金具８に取付け
られた振動機９により上下動するように駆動され、それ
によって上部電極３の下部電極４との間の距離の変化、
従って可動電極である上部電極３の上下動が行われるこ
とができるようにされている。The upper electrode 3 is insulated from the other by the insulator 6 so as to face the lower electrode 4, and is supported by the holding bracket 8 at the portion of the movable shaft 11 so that the facing distance can be adjusted. The movable shaft 11 is driven to move up and down by a vibrator 9 attached to a device stand or a holding bracket 8 by a frame (not shown), thereby changing the distance between the upper electrode 3 and the lower electrode 4.
Therefore, the upper electrode 3, which is a movable electrode, can be moved up and down.
上部電極３は、電圧可変電源７と接続され、任意の電
圧が供給できるようになっている。下部電極に測定対象
粉粒体を希望の状態に、例えば板状に整形して載せる。
或いは下部電極を薄い壁をもつ容器として、この中に測
定対象粉体を充填する。その後振動機９を稼働させて下
部電極４に対して上部電極３を上下動させることによ
り、上部電極３と下部電極４との間の距離を、被測定粉
粒体に影響を与えない程度の速さと振幅をもって変化さ
せる。それによってこの１組の電極３、４で形成される
静電容量値は、上部電極３の上下動と同期して変化す
る。The upper electrode 3 is connected to a voltage variable power supply 7 so that an arbitrary voltage can be supplied. The powdery substance to be measured is placed on the lower electrode in a desired state, for example, shaped into a plate.
Alternatively, the lower electrode is formed as a container having a thin wall and the powder to be measured is filled therein. Thereafter, the vibrator 9 is operated to move the upper electrode 3 up and down with respect to the lower electrode 4, so that the distance between the upper electrode 3 and the lower electrode 4 is set to such an extent as not to affect the granular material to be measured. Vary with speed and amplitude. Thereby, the capacitance value formed by the pair of electrodes 3 and 4 changes in synchronization with the vertical movement of the upper electrode 3.
可変電圧電源７と、接触電位差を電源とし、上記静電
容量で決定される回路インピーダンスを負荷とする閉回
路が作られる。A variable voltage power supply 7 and a closed circuit using a contact potential difference as a power supply and a load using a circuit impedance determined by the capacitance are created.
振動機９が停止している場合、可変電圧電源７と接触
電位差の和が「０」Ｖでないと、電流計１には過渡応答
電流が流れ、最終的には「０」Ａとなって安定する。When the vibrator 9 is stopped, if the sum of the variable voltage power supply 7 and the contact potential difference is not “0” V, a transient response current flows through the ammeter 1 and finally becomes “0” A, which is stable. I do.
振動機９が稼働している場合、可変電圧電源７と接触
電位差の和が「０」Ｖでないと、静電容量値（振動の速
度、変化量に応じる）の変化に応じた電流値が電流計１
によって検出される。If the sum of the variable voltage power supply 7 and the contact potential difference is not “0” V when the vibrator 9 is operating, the current value corresponding to the change in the capacitance value (corresponding to the speed of vibration and the amount of change) becomes the current. Total 1
Is detected by
そこで測定するときは、振動機９を稼働させ、電圧可
変電源７を調節する。電圧値が接触電位差の値と等しく
なると、検出電流値が「０」Ａとなる。従って、この時
の電圧可変電源７の電圧を電圧計２で読み取ることによ
り接触電位差を求めることができる。Therefore, when measuring, the vibrator 9 is operated and the voltage variable power supply 7 is adjusted. When the voltage value becomes equal to the value of the contact potential difference, the detected current value becomes “0” A. Therefore, by reading the voltage of the voltage variable power supply 7 at this time with the voltmeter 2, the contact potential difference can be obtained.
本発明による粉粒体の接触電位差測定装置による測定
の際、振動機９を稼働させ、電流計１の針の振れを見
て、電圧可変電源７を調節する。電圧値が接触電位差の
値と等しくなると、電流計１における検出電流値が
「０」Ａとなる。従って、この時の電圧可変電源７の電
圧を電圧計２で読み取ることにより粉粒体５の接触電位
差を求めることができる。At the time of the measurement of the granular material by the contact potential difference measuring apparatus according to the present invention, the vibrator 9 is operated, and the variable voltage power supply 7 is adjusted while observing the deflection of the needle of the ammeter 1. When the voltage value becomes equal to the value of the contact potential difference, the detected current value in the ammeter 1 becomes "0" A. Therefore, by reading the voltage of the variable voltage power supply 7 at this time with the voltmeter 2, the contact potential difference of the granular material 5 can be obtained.
図２は、本発明による粉粒体の接触電位差測定装置の
第２実施例を表わす図である。上部電極３と下部電極４
は、相互間の電界の作用を均一化するために、それぞれ
絶縁体６を介して中心の電極３及び４と、その周囲のガ
ード電極10、10とに分割されている。それによってカー
ド電極10間の電気力線の分布が均一になり、その結果粉
粒体の接触電位差測定の安定性及び測定精度の向上を達
成することができる。FIG. 2 is a view showing a second embodiment of the apparatus for measuring a contact potential difference of a granular material according to the present invention. Upper electrode 3 and lower electrode 4
Are divided into a center electrode 3 and 4 and a guard electrode 10 and 10 around the center electrode 3 via an insulator 6 in order to equalize the action of the electric field between them. As a result, the distribution of the lines of electric force between the card electrodes 10 becomes uniform, and as a result, the stability and accuracy of the measurement of the contact potential difference of the granular material can be improved.
保持金具８は、装置全体を取り囲むように電気的・電
磁的遮蔽材料で製作することにより外部からの影響を取
り除き、それによって更に測定の安定性、測定精度の向
上を達成することができる。The holding bracket 8 is made of an electric / electromagnetic shielding material so as to surround the entire device, thereby eliminating external influences, thereby further improving measurement stability and measurement accuracy.
（発明の効果） 本発明によれば、粉粒体の金属との接触電位差測定が
確実にかつ高精度で行われ得る。(Effects of the Invention) According to the present invention, the measurement of the contact potential difference between the granular material and the metal can be performed reliably and with high accuracy.
図１は、本発明による粉粒体の接触電位差測定装置の第
１実施例を表わす図、そして図２は、本発明による粉粒
体の接触電位差測定装置の第２実施例を表わす図であ
る。 図中符号 １……電流計 ２……電圧計 ３……上部電極 ４……下部電極 ５……粉粒体 ６……絶縁体 ７……電圧可変電源 ８……保持金具 ９……振動機 10……ガード電極 11……可動軸FIG. 1 is a diagram showing a first embodiment of a contact potential difference measuring device for a granular material according to the present invention, and FIG. 2 is a diagram showing a second embodiment of a contact potential difference measuring device for a granular material according to the present invention. . Reference numeral 1 in the figure 1... Ammeter 2... Voltmeter 3... Upper electrode 4... Lower electrode 5... Powder and granular material 6... Insulator 7... Variable voltage power supply 8. 10 Guard electrode 11 Movable shaft
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) G01N 27/00 - 27/60 G01R 29/24 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) G01N 27/00-27/60 G01R 29/24
Claims (2)
に挟んで、粉粒体（５）と電極表面との間の接触電位差
を測定するために、２つの電極（３、４）を電圧可変電
源（７）に接続する回路を形成し、この回路に電流計
（１）を装着するとともに、前記電圧可変電源（７）の
電圧を測定する電圧計（２）と、前記２つの電極（３、
４）の距離を変化させる振動機（９）を備え、この振動
機（９）を稼働させた際に前記電流計（１）の測定値が
ゼロとなるように前記電圧可変電源（７）の電圧を調節
し、このときの電圧を前記電圧計（２）で読み取ること
により接触電位差を求めるように構成されたことを特徴
とする前記粉粒体の接触電位差測定装置。1. A method for measuring a contact potential difference between a granular material (5) and an electrode surface by sandwiching the granular material (5) between two electrodes (3, 4). A circuit for connecting (3, 4) to a variable voltage power supply (7) is formed, an ammeter (1) is mounted on this circuit, and a voltmeter (2) for measuring the voltage of the variable voltage power supply (7). And the two electrodes (3,
4) a vibrator (9) for changing the distance, wherein the vibrator (9) is operated so that the measured value of the ammeter (1) becomes zero when the vibrator (9) is operated. The contact potential difference measuring device for a granular material, wherein a voltage is adjusted and a contact potential difference is obtained by reading the voltage at this time with the voltmeter (2).
縁体（６、６）を介して、それぞれその中心の電極
（３、４）と、その周辺の電極（10、10）とに分割され
ている、請求項１に記載された、粉粒体の接触電位差測
定装置。2. An upper electrode (3) and a lower electrode (4) are respectively provided with a central electrode (3, 4) and a peripheral electrode (10, 10) via an insulator (6, 6). The contact potential difference measuring device for a granular material according to claim 1, wherein the device is divided into:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2270885A JP2977596B2 (en) | 1990-10-09 | 1990-10-09 | Contact potential difference measuring device for powders |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2270885A JP2977596B2 (en) | 1990-10-09 | 1990-10-09 | Contact potential difference measuring device for powders |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04147047A JPH04147047A (en) | 1992-05-20 |
| JP2977596B2 true JP2977596B2 (en) | 1999-11-15 |
Family
ID=17492323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2270885A Expired - Fee Related JP2977596B2 (en) | 1990-10-09 | 1990-10-09 | Contact potential difference measuring device for powders |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2977596B2 (en) |
-
1990
- 1990-10-09 JP JP2270885A patent/JP2977596B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04147047A (en) | 1992-05-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |