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JPS59143929A - Load cell scale - Google Patents

Load cell scale

Info

Publication number
JPS59143929A
JPS59143929A JP1834983A JP1834983A JPS59143929A JP S59143929 A JPS59143929 A JP S59143929A JP 1834983 A JP1834983 A JP 1834983A JP 1834983 A JP1834983 A JP 1834983A JP S59143929 A JPS59143929 A JP S59143929A
Authority
JP
Japan
Prior art keywords
load
forming
compensating resistor
output
strain gages
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.)
Granted
Application number
JP1834983A
Other languages
Japanese (ja)
Other versions
JPH0252972B2 (en
Inventor
Toru Kitagawa
徹 北川
Takayoshi Endo
遠藤 高義
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokyo Sanyo Electric Co Ltd
Toshiba TEC Corp
Original Assignee
Tokyo Sanyo Electric Co Ltd
Tokyo Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tokyo Sanyo Electric Co Ltd, Tokyo Electric Co Ltd filed Critical Tokyo Sanyo Electric Co Ltd
Priority to JP1834983A priority Critical patent/JPS59143929A/en
Publication of JPS59143929A publication Critical patent/JPS59143929A/en
Publication of JPH0252972B2 publication Critical patent/JPH0252972B2/ja
Granted legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00Measuring force or stress, in general
    • G01L1/20Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2268Arrangements for correcting or for compensating unwanted effects
    • G01L1/2281Arrangements for correcting or for compensating unwanted effects for temperature variations

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Force In General (AREA)

Abstract

PURPOSE:To avoid the effect of temperature, by forming a hollow part, which comprises two through holes forming soft parts at four places, and a communicating part forming a thick part between the soft parts with the through holes being communicated, in a rod-shaped raw material, providing the main body of a load cell, forming strain gages at the outer surfaces of the soft parts, sticking a compensating resistor at the inner surface on the side of the hollow part, coating said compensating resistor, thereby compensating for the output at the same temperature as that of the strain gages. CONSTITUTION:When a load is applied to a movable part 8, soft parts 2 are deformed, and the values of respective strain gages 9 are changed. Change in output is yielded by the deformation, and the load is measured as the electrical output. Since the position, to which a compensating resistor 18 is stuck, is not deformed by the load, the change in resistance value due to the load is not yielded. Since the compensating resistor 18 is located at the approximately central position between the strain gages 9, the temperature change from the outside becomes the same conditions, and the output voltage is always maintained at the stable state. The attaching position of the compensating resistor 18 is not the place where foreign matters hit from the outside, mechanical protection need not be considered.

Description

【発明の詳細な説明】 発明の技術分野 本発明は、荷重によυ変形する部分にストレンゲージを
設けて電気的出力により荷重を測定するようKしたロー
ドセル秤に関するものである。
DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a load cell scale that is equipped with a strain gauge in a portion that is deformed by a load so as to measure the load by electrical output.

技術的背景およびその問題点 一般にこの種のロードセル秤においては、ロードセル本
体に四個所の柔軟部を形成し、これらの柔軟部にそれぞ
れブリッジ結合されたストレンゲ−ジを貼付している。
Technical Background and Problems Generally, in this type of load cell scale, four flexible parts are formed in the load cell body, and bridge-bonded strain gauges are attached to each of these flexible parts.

また、出力補償用の抵抗も接続されている。ところが、
この出力補償抵抗は歪の生じる位置に貼付することがで
きないため、ストレンゲージの位置とは離れてしまい、
温度的に異なった状態で使用されるものであり、その特
性が一致しない。さらに、出力補償抵抗はシリコンゴム
で覆われている程度であシ、機械的な保護はなされてい
るが、防湿性は低く、これにょシ、湿度の影響を受けて
精度が低下すると云う問題もある。
A resistor for output compensation is also connected. However,
This output compensation resistor cannot be attached to the location where strain occurs, so it is located far away from the strain gauge.
They are used under different temperature conditions and their characteristics do not match. Furthermore, the output compensation resistor is only covered with silicone rubber, and although it is mechanically protected, its moisture resistance is low, and there is also the problem that accuracy decreases due to the influence of humidity. be.

発明の目的 本発明は、ストレンゲージと同一の温度のもとで出力補
償がなされ、かつ、湿度の影響もないようにしたロード
セル秤を得ることを目的とする。
OBJECTS OF THE INVENTION The object of the present invention is to provide a load cell weighing device whose output is compensated at the same temperature as that of the strain gauge and which is not affected by humidity.

発明の概要 本発明は、補償抵抗の貼付位置を厚肉部の抜部側の内面
としたので、ストレンゲージが形成される柔軟部の変形
が全く伝達されず、また、ストレンゲージに近い位置で
あるため、温度的には一定の条件となって高精度の補償
を行なうことがfき、さらに、補償抵抗の結句位置は機
械的な保護の考慮をする必要がない部分であり、これに
より、防湿性の高いブチルゴム系の被覆で覆って湿度の
影響が全くないように構成したものである。
SUMMARY OF THE INVENTION In the present invention, since the compensation resistor is attached to the inner surface of the thick part on the side where the strain gauge is removed, the deformation of the flexible part where the strain gauge is formed is not transmitted at all, and the compensation resistor is attached at a position close to the strain gauge. Therefore, it is possible to perform high-precision compensation under a constant temperature condition, and furthermore, the position of the compensation resistor is a part where there is no need to consider mechanical protection. It is covered with a highly moisture-proof butyl rubber coating so that it is completely unaffected by humidity.

発明の実施例 まず、ロードセル本体(1)は高力アルミニウムのA 
2024 S材のようなアルミニウムよシなる引抜材を
機械加工によシ加工して形成したものであシ、四個所の
柔軟部(2)全形成する抜穴(3)と前記柔軟部(2)
間に厚肉部(4)を形成する連通部(5)とよシなる抜
部(6)を有する。そして、前記ロードセル本体(1)
の一端はベース等に固着される固定部(7)であり、他
端は荷重が加えられる可動部(8)である。
Embodiments of the invention First, the load cell body (1) is made of high-strength aluminum A.
It is formed by machining a drawn material made of aluminum such as 2024 S material, and has four flexible parts (2), a hole (3) to be completely formed, and the flexible part (2). )
It has a communication part (5) forming a thick part (4) therebetween and a cutout part (6). And the load cell main body (1)
One end is a fixed part (7) fixed to a base etc., and the other end is a movable part (8) to which a load is applied.

ついで、前記柔軟部(2)のそれぞれの外面にはR7と
表示される四個のストレンゲージ(9)が貼付されてい
る。これらのストレンゲージ(9)の表面はブチルゴム
系の被覆αOで覆われている。そして、これらのストレ
ンゲージ(9)は前記ロードセル本体(1)の固定部(
7)の側面に取付けられたPC板Ql)にリード線(ロ
)により接続されてブリッジ結合されている。さらに、
接続線(11およびコネクタα→によシ入力部0と出力
部αGとに接続されている。また、リード線α乃によシ
補償抵抗α匂が接続されている。この補償抵抗(IQは
厚肉部(4)の抜部(6)側の内面に貼付されている。
Next, four strain gauges (9) labeled R7 are attached to the outer surface of each of the flexible parts (2). The surfaces of these strain gauges (9) are covered with a butyl rubber coating αO. These strain gauges (9) are attached to the fixed part (
It is connected to the PC board Ql) attached to the side surface of 7) by a lead wire (b) and is bridge-coupled. moreover,
The connecting wire (11 and connector α → is connected to input section 0 and output section αG. Also, a compensation resistor α is connected to lead wire α. This compensation resistor (IQ is It is pasted on the inner surface of the thick part (4) on the side of the cutout (6).

そして、厚肉部(4)にブライマー処理を行ない補償抵
抗0杓の周囲にブチル系のゴムシートα(至)を未加硫
のブチル系のゴム液によシ貼シ合わせる。
Then, the thick part (4) is subjected to a brimer treatment, and a butyl rubber sheet α is laminated around the zero compensation resistance using an unvulcanized butyl rubber liquid.

そして、前記リード線αηを導出させつつ被覆となるブ
チル系ゴムシーif)を未加硫のブチル系のゴム液によ
シ貼シ合わせる。このように貼り合わせた後に加圧加熱
処理を行ない加硫接着する。
Then, while leading out the lead wire αη, the butyl-based rubber sheet if) serving as the coating is laminated with an unvulcanized butyl-based rubber liquid. After bonding in this manner, pressure and heat treatment is performed to vulcanize and bond.

このような構成において、可動部(8)に荷重を加えた
とき柔軟部(2)が変形し、個々のヌトレンゲージ(9
)の値が変化する。これによシ、出力変化が生じて荷重
が電気的出力として測定される。このとき、補償抵抗α
槌が貼付された位置は荷重によって全く変形しないとこ
ろであるので、荷重による抵抗値の変化は生じない。す
なわち、荷重の影響を全く受けない。また、ストレンゲ
ージ(9)が配置されたほぼ中間的な位置に補償抵抗α
Qが存するので、外界からの温度変化が同じ条件となシ
、常に出カ看Y圧が安定な状態に維持される。
In such a configuration, when a load is applied to the movable part (8), the flexible part (2) deforms and the individual nutren gauges (9)
) changes. This causes an output change and the load is measured as an electrical output. At this time, compensation resistance α
Since the location where the hammer is attached is not deformed by the load at all, the resistance value does not change due to the load. That is, it is not affected by the load at all. In addition, a compensation resistor α is placed at an approximately intermediate position where the strain gauge (9) is arranged.
Since Q exists, the output Y pressure is always maintained in a stable state as long as the temperature change from the outside is the same.

つぎに、補償抵抗0υの取付位置は、外部から異物が衝
突するようなところではないので、機械的保護を考慮す
る必要がない。そして、ブチルゴム系の被覆で覆われて
いることにょシ、高い防湿性があシ、湿度の影響を受け
ることもない。
Next, since the mounting position of the compensation resistor 0υ is not a place where foreign matter will collide with it from the outside, there is no need to consider mechanical protection. Furthermore, since it is covered with a butyl rubber coating, it has high moisture resistance and is not affected by humidity.

発明の効果 本発明は、上述のように補償抵抗を厚肉部の抜部側の内
面に貼付したので、柔軟部の変形が伝達されることが々
く、また、ストレンゲージに近接しているため、それら
のストレンゲージと同一の温度条件下におくことができ
、これにょシ、出方が安定しておシ、さらに、ブチルゴ
ム系の被覆テ覆ったので防湿性が高くて湿度の影響を受
けることがないものである。
Effects of the Invention In the present invention, as described above, the compensation resistor is attached to the inner surface of the thick part on the side where the part is removed, so that the deformation of the flexible part is often transmitted. Because of this, it can be placed under the same temperature conditions as those strain gauges, which ensures stable output.Furthermore, since it is covered with a butyl rubber coating, it has high moisture resistance and is not affected by humidity. It is something that cannot be received.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明の一実施例を示すもので、第1図は斜視図
、第2図はブロック図、第3図は一部を拡大した断面図
である。 1・・・ロードセル本体、2・・・柔軟部、3・・・抜
穴、4・・・厚肉部、5・・・連通部、6・・・抜部、
9・・・ストレンケーシ、18・・・補償抵抗、2o・
・・ブチル系ゴムシート(被覆) 出 願 人   東京電気株式会社
The drawings show one embodiment of the present invention; FIG. 1 is a perspective view, FIG. 2 is a block diagram, and FIG. 3 is a partially enlarged sectional view. 1... Load cell body, 2... Flexible part, 3... Hole cut out, 4... Thick wall part, 5... Communication part, 6... Pull out part,
9...Strain case, 18...Compensation resistor, 2o・
...Butyl rubber sheet (covering) Applicant Tokyo Electric Corporation

Claims (1)

【特許請求の範囲】[Claims] 四個所の柔軟部を形成する二個の抜穴とこれらの抜穴を
連通しつつ前記柔軟部間に厚肉部を形成する連通部とよ
シなる抜部を棒状素材に形成してロードセル本体を設け
、前記柔軟部の外面にそれぞれブリッジ回路を形成する
ストレンゲージを形成し、前記厚肉部の前記抜部側の内
面に補償抵抗を貼付し、この補償抵抗をブチルゴム系の
被覆で覆ったことを特徴とするロードセル秤。
A load cell main body is manufactured by forming two cut-out holes forming four flexible parts and a cut-out part which is different from the communication part which communicates with these holes and forms a thick part between the flexible parts in a rod-shaped material. A strain gauge forming a bridge circuit was formed on the outer surface of each of the flexible parts, a compensation resistor was attached to the inner surface of the thick part on the side of the cutout part, and this compensation resistor was covered with a butyl rubber coating. A load cell scale characterized by:
JP1834983A 1983-02-07 1983-02-07 Load cell scale Granted JPS59143929A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1834983A JPS59143929A (en) 1983-02-07 1983-02-07 Load cell scale

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1834983A JPS59143929A (en) 1983-02-07 1983-02-07 Load cell scale

Publications (2)

Publication Number Publication Date
JPS59143929A true JPS59143929A (en) 1984-08-17
JPH0252972B2 JPH0252972B2 (en) 1990-11-15

Family

ID=11969189

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1834983A Granted JPS59143929A (en) 1983-02-07 1983-02-07 Load cell scale

Country Status (1)

Country Link
JP (1) JPS59143929A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6122875A (en) * 1984-07-10 1986-01-31 住友ゴム工業株式会社 Ball hitting device
JPS6151532A (en) * 1984-08-21 1986-03-14 Tokyo Electric Co Ltd Load cell
JPS61284265A (en) * 1985-06-12 1986-12-15 住友ゴム工業株式会社 Ball hitting tool
JPS62233731A (en) * 1986-04-04 1987-10-14 Kyowa Electronic Instr Corp Ltd Column type load transducer
JPS6352025A (en) * 1986-08-22 1988-03-05 Tokyo Electric Co Ltd Load cell
JP2000292273A (en) * 1999-04-09 2000-10-20 Teraoka Seiko Co Ltd Load cell
JP2013011488A (en) * 2011-06-28 2013-01-17 Shinko Denshi Kk Coil for electronic balance and moisture preventing method therefor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6122875A (en) * 1984-07-10 1986-01-31 住友ゴム工業株式会社 Ball hitting device
JPS6151532A (en) * 1984-08-21 1986-03-14 Tokyo Electric Co Ltd Load cell
JPS61284265A (en) * 1985-06-12 1986-12-15 住友ゴム工業株式会社 Ball hitting tool
JPH0533071B2 (en) * 1985-06-12 1993-05-18 Sumitomo Rubber Ind
JPS62233731A (en) * 1986-04-04 1987-10-14 Kyowa Electronic Instr Corp Ltd Column type load transducer
JPS6352025A (en) * 1986-08-22 1988-03-05 Tokyo Electric Co Ltd Load cell
JP2000292273A (en) * 1999-04-09 2000-10-20 Teraoka Seiko Co Ltd Load cell
JP2013011488A (en) * 2011-06-28 2013-01-17 Shinko Denshi Kk Coil for electronic balance and moisture preventing method therefor

Also Published As

Publication number Publication date
JPH0252972B2 (en) 1990-11-15

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