JP3279052B2 - Electronic balance - Google Patents
Electronic balanceInfo
- Publication number
- JP3279052B2 JP3279052B2 JP08472994A JP8472994A JP3279052B2 JP 3279052 B2 JP3279052 B2 JP 3279052B2 JP 08472994 A JP08472994 A JP 08472994A JP 8472994 A JP8472994 A JP 8472994A JP 3279052 B2 JP3279052 B2 JP 3279052B2
- Authority
- JP
- Japan
- Prior art keywords
- balance
- lever
- weight
- gravity
- center
- 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
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- Measurement Of Force In General (AREA)
- Electric Ovens (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は電磁力平衡型の電子天び
んに関し、更に詳しくは、コイルに電流を流すことによ
って発生する電磁力を、レバーを介して被測定荷重と釣
り合わせるように構成された電子天びんに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic balance of the electromagnetic force balance type, and more particularly, to a structure in which an electromagnetic force generated by applying a current to a coil is balanced with a load to be measured through a lever. Electronic balance.
【０００２】[0002]
【従来の技術】電磁力平衡型の天びんにおいては、一般
に、永久磁石によって作られた静磁界中に可動のコイル
を配置し、そのコイルに電流を流すことによって発生す
る電磁力を被測定荷重と釣り合わせ、その釣り合い状態
でのコイル電流の大きさから被測定荷重の大きさを算出
する。2. Description of the Related Art In an electromagnetic force balance type balance, generally, a movable coil is arranged in a static magnetic field formed by a permanent magnet, and an electromagnetic force generated by flowing a current through the coil is used as a load to be measured. The magnitude of the load to be measured is calculated from the magnitude of the coil current in the balanced state.
【０００３】このような電磁力平衡型の電子天びんで
は、支点を中心として回動自在のレバーの一端部にコイ
ルを装着するとともに、他端部には被測定荷重を作用さ
せ、そのレバーの回動変位をセンサで検出して、そのセ
ンサの出力に基づいてレバーが水平状態となるようにコ
イルに流れる電流を制御するような構造を採るものが多
い。このような構成によると、レバー比を変更すること
によって、同一の電磁力平衡メカニズムを用いて種々の
ひょう量の天びんを製造することができるという利点が
ある。In such an electronic balance of the electromagnetic force balance type, a coil is attached to one end of a lever that is rotatable around a fulcrum, and a load to be measured is applied to the other end to rotate the lever. In many cases, a structure is employed in which a dynamic displacement is detected by a sensor and the current flowing through the coil is controlled so that the lever is in a horizontal state based on the output of the sensor. According to such a configuration, there is an advantage that by changing the lever ratio, balances of various weighing capacities can be manufactured using the same electromagnetic force balancing mechanism.
【０００４】ところで、このようなレバーには、コイル
のほか、被測定荷重を載せるための皿や皿受け等を含む
部材が連結され、その全体でいわゆる天びんの可動部
（バランス用メカニズム）が形成されるが、被測定荷重
が０の状態、つまり無負荷状態においてフォースコイル
の発生力が規定値、例えばひょう量の１０％になるよう
に、適当な重さのバランス調整用錘（いわゆる調子玉）
をレバーの適宜箇所に装着している。By the way, in addition to the coil, a member including a plate and a plate receiver for placing a load to be measured is connected to such a lever, and a movable portion (balance mechanism) of the balance is formed as a whole. However, when the load to be measured is 0, that is, when the load is not applied, the force generated by the force coil becomes a specified value, for example, 10% of the weighing capacity. )
Is attached to an appropriate part of the lever.
【０００５】このようなことから、前記したようにレバ
ー比を変更する場合には、可動部材のバランスを新たに
調整する必要があり、通常はバランス調整用錘の重量を
変更することによって対処している。[0005] Therefore, when the lever ratio is changed as described above, it is necessary to newly adjust the balance of the movable member, which is usually dealt with by changing the weight of the balance adjusting weight. ing.
【０００６】一方、天びんにおいては、一般に、その設
置状態が水平からし変化しても、０点の変化が少ないの
が望ましく、そのためには、レバーを含む天びんの可動
部材の重心と支点の高さを一致させればよいことが知ら
れている。また、天びんの可動部の重心と支点の高さを
一致させておくことにより、水平方向への外乱が天びん
に作用したときに発生するモーメントを最小にできると
いう利点がある。On the other hand, in a balance, it is generally desirable that the change in the zero point is small even if the installation state changes from horizontal. For this purpose, the center of gravity of the movable member of the balance including the lever and the height of the fulcrum are required. It is known that it is only necessary to make them match. Further, by making the center of gravity of the movable portion of the balance coincide with the height of the fulcrum, there is an advantage that the moment generated when a horizontal disturbance acts on the balance can be minimized.
【０００７】以上のことから、従来のこの種の天びんに
おいては、図３にその機構図を例示するように、支点３
１を中心として、その一端部にコイル３２が装着され、
他端部に被測定荷重を載せる皿３３等が連結されたレバ
ー３４には、バランス調整用の錘３５のほか、重心調整
用の錘３６が装着された構造が採られる。なお、各錘３
５および３６の位置は、従来、それぞれの機能を全うで
きる位置で、しかも天びんメカニズムの動作を妨げない
ような適当な位置としている。As described above, in this type of conventional balance, as shown in FIG.
A coil 32 is mounted on one end of the coil 1 around
The lever 34 connected to the plate 33 on which the load to be measured is placed at the other end has a structure in which a weight 36 for adjusting the center of gravity is mounted in addition to a weight 35 for adjusting the balance. In addition, each weight 3
Conventionally, positions 5 and 36 are positions where the respective functions can be performed, and appropriate positions which do not hinder the operation of the balance mechanism.
【０００８】[0008]
【発明が解決しようとする課題】以上のような電磁力平
衡型の天びんによると、レバー比を変更する場合、バラ
ンス調整用の錘３５を変更する必要があることは前記し
たが、その結果として可動部の重心が変化する。図３の
例では、バランス調整用の錘３５が支点３１の高さより
も低い位置にあるため、例えば錘３５を軽くすると、可
動部の重心が支点３１よりも高くなる。この場合、重心
調整用の錘３６を上下に移動させて新たに重心を調整す
る必要があり、生産性が悪いという問題があった。According to the balance of the electromagnetic force balance type described above, when changing the lever ratio, it is necessary to change the weight 35 for balance adjustment, as a result. The center of gravity of the movable part changes. In the example of FIG. 3, since the weight 35 for balance adjustment is at a position lower than the height of the fulcrum 31, for example, when the weight 35 is lightened, the center of gravity of the movable portion becomes higher than the fulcrum 31. In this case, it is necessary to move the weight 36 for adjusting the center of gravity up and down to newly adjust the center of gravity, and there is a problem that productivity is poor.
【０００９】本発明の目的は、レバー比を変更しても、
バランス調整錘を変更するだけで、レバーを含む可動部
の重心を新たに調整する必要がなく、１種の電磁力平衡
メカニズムから、ひょう量の異なる複数種の天びんを製
造する際の生産性を良好なものとすることのできる構造
を持った電子天びんを提供することにある。It is an object of the present invention to change the lever ratio.
By simply changing the balance adjustment weight, there is no need to adjust the center of gravity of the movable part including the lever.This improves productivity when manufacturing multiple types of balances with different weighing capacity from one type of electromagnetic force balancing mechanism. An object of the present invention is to provide an electronic balance having a structure that can be improved.
【００１０】[0010]
【課題を解決するための手段】上記の目的を達成するた
めの構成を、実施例図面である図１を参照しつつ説明す
ると、本発明の電子天びんは、静磁界中に置かれたコイ
ルに電流を流すことによって発生する電磁力を、支点を
中心として回動自在のレバーを介して被測定荷重と釣り
合わせ、その釣り合い状態でコイルに流れる電流から被
測定荷重を計測する天びんにおいて、レバーを含む天び
んの可動部の重心高さに略同一の高さの水平面上に、当
該天びんの可動部のバランスを調整するための錘を配設
したことによって特徴づけられる。A configuration for achieving the above object will be described with reference to FIG. 1 which is an embodiment drawing. An electronic balance according to the present invention comprises a coil placed in a static magnetic field. An electromagnetic force generated by flowing an electric current is balanced with a load to be measured through a lever that is rotatable about a fulcrum, and the balance is used to measure the load to be measured from a current flowing through a coil. The balance is characterized in that a weight for adjusting the balance of the movable portion of the balance is disposed on a horizontal plane having a height substantially equal to the height of the center of gravity of the movable portion of the balance.
【００１１】[0011]
【作用】バランス調整用の錘の重量を変更しても、この
錘が可動部の重心と略同一の高さに設けられているた
め、可動部の重心高さは変化しない。従って、レバー比
を変更した場合、フォースコイルの発生力が規定の、例
えばひょう量の１０％となるようにバランス調整用の錘
の重量を変化させて調整する必要はあるが、その錘の重
量を変化させても可動部の重心が変化しないため、重心
調整作業は不要となる。When the weight of the weight for balance adjustment is changed, the height of the center of gravity of the movable portion does not change because the weight is provided at substantially the same height as the center of gravity of the movable portion. Therefore, when the lever ratio is changed, it is necessary to change the weight of the weight for balance adjustment so that the force generated by the force coil becomes a specified value, for example, 10% of the weighing capacity. Is changed, the center of gravity of the movable portion does not change, so that the operation of adjusting the center of gravity becomes unnecessary.
【００１２】[0012]
【実施例】図１は本発明実施例の機構図と電気的回路構
成のブロック図とを併記して示す構成図である。FIG. 1 is a block diagram showing a mechanical diagram and an electric circuit block diagram of an embodiment of the present invention.
【００１３】支点１を中心として回動自在のレバー２に
は、その一方側にコイル３が固着されているとともに、
他方側は連結部材４を介して可動柱５が連結されてい
る。可動柱５の上端には、被測定荷重を載せるための皿
６が配置されている。可動柱５は、また、互いに平行な
ビーム７ａおよび７ｂの一端部に弾性部７１ａ，７１ｂ
を介して連結されており、この各ビーム７ａおよび７ｂ
の他端部は同じく弾性部７２ａ，７２ｂを介して天びん
の固定部に連結され、これらでロバーバル機構を構成し
て、可動柱５の変位が垂直方向のみとなるように規制し
ている。A coil 3 is fixed to one side of a lever 2 that is rotatable about a fulcrum 1.
On the other side, a movable column 5 is connected via a connecting member 4. At the upper end of the movable column 5, a plate 6 for placing a load to be measured is arranged. The movable column 5 also has elastic portions 71a, 71b at one ends of beams 7a and 7b parallel to each other.
And these beams 7a and 7b
The other end of the movable column 5 is connected to the fixed portion of the balance via the elastic portions 72a and 72b, and constitutes a roberval mechanism by which the displacement of the movable column 5 is restricted so as to be only in the vertical direction.
【００１４】前記したコイル３は、永久磁石８１を主体
とする磁気回路８が作る静磁場中に配置されており、こ
のコイル３に電流が流れることによって、鉛直方向への
電磁力が発生してコイル３に作用する。そして、このコ
イル３に流れる電流は、以下に示すような回路構成のも
とに、レバー２が水平状態を維持するように制御され
る。The coil 3 is arranged in a static magnetic field generated by a magnetic circuit 8 mainly composed of a permanent magnet 81. When a current flows through the coil 3, an electromagnetic force is generated in a vertical direction. Acts on coil 3. The current flowing through the coil 3 is controlled such that the lever 2 maintains a horizontal state under the following circuit configuration.
【００１５】すなわち、レバー２の回動変位は、その一
端部に配置された変位センサ１０によって検出される。
この変位センサ１０の出力はサーボアンプ１１およびＰ
ＩＤ制御回路１２に導かれ、レバー２の変位に応じた電
流となってコイル３に流される結果、レバー２の回動変
位量が０、すなわち水平状態を保つような電磁力がコイ
ル３を介してレバー２に伝達される。このような構成に
おいては、皿６に被測定荷重が作用してレバー２が変位
しようとすると、その変位を打ち消すような電流がコイ
ル３に流れて自動平衡する。従って平衡状態でコイル３
に流れる電流は皿６上の荷重と比例したものとなる。コ
イル３に流れる電流は、抵抗Ｒによって電圧信号に変換
された後にＡ−Ｄ変換器１３によってデジタル化され、
荷重データとしてマイクロコンピュータ１４に採り込ま
れる。マイクロコンピュータ１４では、その荷重データ
と、静磁界中の磁界の強さ、コイル３の半径並びに巻き
数、およびレバー２のレバー比等の装置定数とから、皿
６上の荷重を算出し、表示器１５に計量値として表示す
る。That is, the rotational displacement of the lever 2 is detected by the displacement sensor 10 disposed at one end thereof.
The output of this displacement sensor 10 is
The current is guided to the ID control circuit 12, becomes a current corresponding to the displacement of the lever 2, and is passed through the coil 3. Is transmitted to the lever 2. In such a configuration, when the load to be measured acts on the plate 6 and the lever 2 is displaced, a current that cancels the displacement flows through the coil 3 and is automatically balanced. Therefore, the coil 3
Is proportional to the load on the plate 6. The current flowing through the coil 3 is converted into a voltage signal by the resistor R and then digitized by the A / D converter 13.
The data is taken into the microcomputer 14 as load data. The microcomputer 14 calculates and displays the load on the plate 6 from the load data and the device constants such as the strength of the magnetic field in the static magnetic field, the radius and the number of turns of the coil 3, and the lever ratio of the lever 2. Is displayed on the container 15 as a measured value.
【００１６】さて、レバー２には、このレバー２とこれ
に接続された天びんの可動部材を含む系（以下、レバー
系と称する）の重心を調整するための重心調整錘２０が
装着されており、この重心調整錘２０によって、レバー
系の重心が支点１と同じ高さにくるように調整されてい
る。The lever 2 is provided with a center-of-gravity adjusting weight 20 for adjusting the center of gravity of a system including the movable member of the balance connected to the lever 2 (hereinafter, referred to as a lever system). The center of gravity of the lever system is adjusted to be at the same height as the fulcrum 1 by the center of gravity adjusting weight 20.
【００１７】また、レバー２には持ち出し部材２１ａが
固着されており、その持ち出し部材２１ａには、レバー
系の重心と同じ高さの水平面上（可動柱５の変位規制方
向に直交する方向の面上）に位置するよう、バランス調
整用錘２１が着脱自在に装着されている。Further, a take-out member 21a is fixed to the lever 2, and the take-out member 21a is provided on a horizontal plane having the same height as the center of gravity of the lever system (a surface in a direction perpendicular to the displacement regulating direction of the movable column 5). The balance adjustment weight 21 is detachably mounted so as to be positioned in (upper).
【００１８】次に、本発明実施例の作用を述べる。図１
の構成において、同一の電磁力平衡メカニズムを用い
て、よりひょう量の小さい天びんを作る場合、レバー比
Ｌ2 ／Ｌ1 を小さくして、皿６に作用する荷重をより小
さくしてコイル３に伝達すればよいが、レバー比を変更
することによってレバー系のバランスが変化するから、
図２に示すように、バランス調整用錘２１の重量を変更
することによってレバー系のバランスを調整する。この
とき、バランス調整用錘２１はレバー系の重心高さと同
一の高さに位置しているため、バランス調整用錘２１と
してどの様な重量のものを装着しようとも、レバー系の
重心は変化せず、従って重心調整用錘２０を変更する必
要がない。Next, the operation of the embodiment of the present invention will be described. FIG.
In the configuration of the above, when a balance with a smaller weighing capacity is manufactured using the same electromagnetic force balancing mechanism, the lever ratio L 2 / L 1 is reduced, the load acting on the pan 6 is reduced, and It should be transmitted, but changing the lever ratio changes the balance of the lever system.
As shown in FIG. 2, the balance of the lever system is adjusted by changing the weight of the balance adjusting weight 21. At this time, since the weight 21 for balance adjustment is located at the same height as the height of the center of gravity of the lever system, the center of gravity of the lever system changes regardless of what weight is attached as the weight 21 for balance adjustment. Therefore, it is not necessary to change the center of gravity adjusting weight 20.
【００１９】なお、図１および図２では、レバー２に持
ち出し部材２１ａを固着して、その持ち出し部材２１ａ
を一旦上方に屈曲させた後に下方に屈曲させることによ
って支点１等に対する干渉を避けると同時にバランス調
整用錘２１の高さを支点１の高さと一致させるようにし
ているが、実際の構成においては各図の紙面に直交する
方向に回避することができ、特に上下方向に屈曲させる
必要はないことは勿論である。In FIGS. 1 and 2, the take-out member 21a is fixed to the lever 2 and the take-out member 21a is fixed.
Is bent upward once and then downward, thereby avoiding interference with the fulcrum 1 and the like, and at the same time, making the height of the balance adjusting weight 21 coincide with the height of the fulcrum 1. However, in an actual configuration, It can be avoided in a direction perpendicular to the paper surface of each drawing, and it is needless to say that it is not particularly necessary to bend vertically.
【００２０】[0020]
【発明の効果】以上説明したように、本発明によれば、
レバーを含む天びんの可動部（レバー系）のバランス調
整用錘を、そのレバー系の重心高さと略同一の高さの水
平面上に設けた構造を採用しているから、１つの電磁力
平衡メカニズムから各種ひょう量の電子天びんを製造す
べくレバーのレバー比を変更した際に、バランス調整用
錘の重量変更によるレバー系のバランス調整を行うだけ
で、レバー系の重心の調整が不要となり、生産性が向上
する。As described above, according to the present invention,
The balance weight of the movable part (lever system) of the balance, including the lever, is adjusted on the horizontal plane at the same height as the height of the center of gravity of the lever system. When the lever ratio is changed to manufacture electronic balances of various weighing capacity from, only the balance adjustment of the lever system by changing the weight of the balance adjustment weight eliminates the need to adjust the center of gravity of the lever system. The performance is improved.
【００２１】また、本発明の採用により、レバー系の重
心はレバー比の変更およびそれに伴うバランス調整に際
して変化しないため、粗い精度の天びんの製造にあって
は、重心調整用錘を装着しない状態でレバー系の重心が
レバーの支点とほぼ同じ高さに位置するように各部を設
計しておくことにより、重心調整用錘を不要とすること
もでき、その分コストダウンを達成することができる。Further, by adopting the present invention, the center of gravity of the lever system does not change when the lever ratio is changed and the balance is adjusted accordingly. Therefore, when manufacturing a balance with a coarse accuracy, the weight for adjusting the center of gravity is not mounted. By designing each part so that the center of gravity of the lever system is located at substantially the same height as the fulcrum of the lever, the weight for adjusting the center of gravity can be eliminated, and the cost can be reduced accordingly.
【図１】本発明実施例の機構図と電気的回路構成のブロ
ック図とを併記して示す構成図FIG. 1 is a configuration diagram showing both a mechanical diagram and an electric circuit configuration block diagram of an embodiment of the present invention.
【図２】図１の天びんメカニズムを用いて、図１のもの
よりもひょう量の小さい天びんを得る場合の機構図FIG. 2 is a diagram showing a mechanism for obtaining a balance having a smaller weighing capacity than that of FIG. 1 using the balance mechanism of FIG. 1;
【図３】従来の電子天びんの構成例を示す機構図FIG. 3 is a mechanism diagram showing a configuration example of a conventional electronic balance.
１ 支点 ２ レバー ３ コイル ４ 連結部材 ５ 可動柱 ６ 皿 ８ 磁気回路 ８１ 永久磁石 １０ 変位センサ １１ サーボアンプ １２ ＰＩＤ制御回路 １３ Ａ−Ｄ変換器 １４ マイクロコンピュータ ２０ 重心調整用錘 ２１ バランス調整用錘 ２１ａ 持ち出し部材 REFERENCE SIGNS LIST 1 fulcrum 2 lever 3 coil 4 connecting member 5 movable column 6 plate 8 magnetic circuit 81 permanent magnet 10 displacement sensor 11 servo amplifier 12 PID control circuit 13 A / D converter 14 microcomputer 20 weight for adjusting center of gravity 21 balance adjusting weight 21 a Take-out member
Claims (1)
ことによって発生する電磁力を、支点を中心として回動
自在のレバーを介して被測定荷重と釣り合わせ、その釣
り合い状態で上記コイルに流れる電流から被測定荷重を
計測する天びんにおいて、上記レバーを含む天びんの可
動部の重心高さに略同一の高さの水平面上に、当該天び
んの可動部のバランスを調整するための錘が配設されて
いることを特徴とする電子天びん。An electromagnetic force generated by passing an electric current through a coil placed in a static magnetic field is balanced with a load to be measured via a lever that is rotatable about a fulcrum. In a balance that measures the load to be measured from the current flowing through the balance, a weight for adjusting the balance of the movable part of the balance is placed on a horizontal plane having a height substantially equal to the height of the center of gravity of the movable part of the balance including the lever. An electronic balance, which is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08472994A JP3279052B2 (en) | 1994-04-22 | 1994-04-22 | Electronic balance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08472994A JP3279052B2 (en) | 1994-04-22 | 1994-04-22 | Electronic balance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07294317A JPH07294317A (en) | 1995-11-10 |
| JP3279052B2 true JP3279052B2 (en) | 2002-04-30 |
Family
ID=13838786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08472994A Expired - Fee Related JP3279052B2 (en) | 1994-04-22 | 1994-04-22 | Electronic balance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3279052B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006002711C5 (en) | 2006-01-19 | 2009-11-12 | Wipotec Wiege- Und Positioniersysteme Gmbh | weighing sensor |
| CN101501463B (en) * | 2006-08-29 | 2010-12-15 | 株式会社岛津制作所 | Electronic balance |
| EP2690415B2 (en) * | 2012-07-23 | 2022-05-18 | Mettler-Toledo GmbH | Force measurement device with sliding weight |
-
1994
- 1994-04-22 JP JP08472994A patent/JP3279052B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07294317A (en) | 1995-11-10 |
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