JP6219700B2 - Load cell - Google Patents

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JP6219700B2
JP6219700B2 JP2013255262A JP2013255262A JP6219700B2 JP 6219700 B2 JP6219700 B2 JP 6219700B2 JP 2013255262 A JP2013255262 A JP 2013255262A JP 2013255262 A JP2013255262 A JP 2013255262A JP 6219700 B2 JP6219700 B2 JP 6219700B2
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strain
load cell
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JP2015114160A (en
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誠 真壁
誠 真壁
孝橋　徹
孝橋　　徹
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Yamato Scale Co Ltd
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本発明は、計量ホッパ、計量コンベヤ、計量タンク、等の各種計量装置に用いられる平行四辺形型、いわゆるロバーバル型のロードセルに関する。   The present invention relates to a parallelogram type load cell used in various weighing devices such as weighing hoppers, weighing conveyors, weighing tanks, etc., that is, a so-called Robertal type load cell.

平行四辺形型のロードセルとしては、例えば、特許文献１に示されているように、計量装置のベース等に固定支持される固定部と荷重を受ける可動部とを、上ビーム部と下ビーム部で連結し、これら上ビーム部及び下ビーム部の両端部に薄肉の起歪部をそれぞれ形成するとともに、各起歪部に歪ゲージを貼着したものが知られている。   As a parallelogram type load cell, for example, as shown in Patent Document 1, a fixed part fixedly supported by a base or the like of a weighing device and a movable part receiving a load are used as an upper beam part and a lower beam part. Are connected to each other, and thin strain-generating portions are formed at both ends of the upper beam portion and the lower beam portion, and a strain gauge is attached to each strain-generating portion.

特開２０１２−６３３０７号公報JP 2012-63307 A

例えば、台秤に用いられる平行四辺形型ロードセルの可動部に装着された計量台上の、平行四辺形型ロードセルの固定部と可動部とに亘って延在する上下ビームの延在方向の中心軸から左右方向に離れた位置に物品を載置すると固定部と可動部の間に形成された起歪部に大きい捻り力作用し、この捻り力によって起歪部に捻れ歪みが生じ、重量値に誤差が生じる。   For example, the central axis in the extending direction of the upper and lower beams extending between the fixed part and the movable part of the parallelogram type load cell on the weighing stage attached to the movable part of the parallelogram type load cell used for the platform scale When the article is placed at a position away from the left and right direction, a large torsional force acts on the straining part formed between the fixed part and the movable part, and this twisting force causes a twisting distortion in the straining part, resulting in a weight value. An error occurs.

本発明は、このような実情に着目してなされたものであって、計量ホッパなど、平行四辺形型ロードセルの可動部に装着された計量台に、中心から離れた位置に大きい偏荷重が作用しても起歪部に生じる捻れ歪みの小さいロードセルを提供することを目的とする。   The present invention has been made paying attention to such a situation, and a large unbalanced load acts on a weighing platform mounted on a movable part of a parallelogram load cell, such as a weighing hopper, at a position away from the center. Even so, it is an object of the present invention to provide a load cell with a small torsional strain generated in the strain-generating portion.

上記目的を達成するために、本発明では次のように構成している。   In order to achieve the above object, the present invention is configured as follows.

（１）本発明は、固定支持される固定部と、荷重を受ける可動部と、前記固定部及び前記可動部の上部を連結する上ビーム部と、前記固定部及び前記可動部の下部を連結する下ビーム部とを備え、前記上及び下の各ビーム部には、固定部寄り及び可動部寄りの２箇所に、荷重検出用の起歪部がそれぞれ形成されると共に、各起歪部に歪ゲージがそれぞれ貼着される平行四辺形型のロードセルであって、
前記各起歪部は、前記固定部と前記可動部とに亘って延在する前記各ビーム部の延在方向に直交する方向に沿って、三つの分割起歪部が並列にそれぞれ形成されており、前記三つの分割起歪部の内、中央の分割起歪部に前記歪ゲージが貼着され、前記中央の分割起歪部は、前記延在方向に沿う両端部に、該分割起歪部と剛体部とを連結する連結部をそれぞれ有し、前記連結部の前記直交する方向に沿う幅が、前記歪ゲージの貼着部位の前記直交する方向に沿う幅に比べて狭く形成される。 (1) In the present invention, a fixed portion that is fixedly supported, a movable portion that receives a load, an upper beam portion that connects the fixed portion and the upper portion of the movable portion, and a lower portion of the fixed portion and the movable portion are connected. The upper and lower beam portions are respectively formed with strain detecting portions for load detection at two locations near the fixed portion and the movable portion, and at each strain generating portion. A parallelogram load cell to which strain gauges are attached,
Each of the strain generating portions includes three divided strain generating portions formed in parallel along a direction orthogonal to the extending direction of each of the beam portions extending across the fixed portion and the movable portion. The strain gauge is attached to a central divided strain generating portion of the three divided strain generating portions, and the central split strain generating portion is provided at both ends along the extending direction. Each has a connecting portion that connects the strain portion and the rigid portion, and the width of the connecting portion along the orthogonal direction is formed narrower than the width along the orthogonal direction of the bonded portion of the strain gauge. The

本発明によると、前記上下のビームに設けられた起歪部は、前記上下のビームの延在方向に直交する方向に沿って並ぶ三つの分割起歪部で構成され、上下ビームの延在方向の中心軸から離れた位置に分割起歪部を設けて、一つのみの起歪部を設けた場合より偏荷重の着力点に近い位置で該偏荷重を支持することによって各起歪部に作用する捻り力を小さくし、各起歪部の捻り歪みを小さくすることによって荷重計測精度を高くする。 According to the present invention, the strain generating portions provided in the upper and lower beams are constituted by three divided strain generating portions arranged along a direction orthogonal to the extending direction of the upper and lower beams, and the extension of the upper and lower beams. Each strain generating portion is provided by providing a split strain generating portion at a position away from the central axis of the direction and supporting the uneven load at a position closer to the point of application of the uneven load than when only one strain generating portion is provided. The load measuring accuracy is increased by reducing the torsional force acting on and reducing the torsional strain of each strain generating portion.

また、両側の二つの分割起歪部のバネ定数は、等しいのが好ましい。   Moreover, it is preferable that the spring constants of the two split strain generating portions on both sides are equal.

前記直交する方向に沿って、前記中央部の分割起歪部を挟んで、その両側にバネ定数が等しい分割起歪部を並列に形成することによって、負荷荷重に対するロードセルの撓み量のバランスが取れ、ロードセルに捻れが発生せず、そのことによる誤差の発生がない。   Along the orthogonal direction, the split strained portions of the central portion are sandwiched, and split strained portions having the same spring constant are formed in parallel on both sides thereof to balance the amount of deflection of the load cell against the load. The load cell is not twisted, and no error occurs due to this.

本発明によると、可動部において、偏って荷重が印加され、ロードセル全体に捻り負荷が作用した場合、幅の狭い連結部で剛体部に連結された前記中央部の分割起歪部には、捻り力が一層作用しにくいものとなり、荷重計測精度がより高いものとなる。 According to the present invention , when a load is applied in a biased manner in the movable part and a torsional load acts on the entire load cell, the split strain generating part at the central part connected to the rigid part by the narrow connecting part is twisted. The force is less likely to act, and the load measurement accuracy is higher.

（２）本発明の他の実施形態では、前記三つの分割起歪部を、前記各ビーム部の延在方向に直交する方向において、上下に貫通させた円形貫通孔によって形成した。 ( 2 ) In another embodiment of the present invention, the three divided strain generating portions are formed by circular through holes that are vertically penetrated in a direction orthogonal to the extending direction of each beam portion.

この実施形態によると、三つの分割起歪部を形成するための起歪部の分割は、ビーム部の延在方向に直交する方向に沿って形成した上下に貫通する円形貫通孔によって行われるので、三つの分割起歪部の製作が容易である。 According to this embodiment, the division of the strain generating portion for forming the three split strain generating portions is performed by a circular through hole penetrating vertically formed along a direction orthogonal to the extending direction of the beam portion. Therefore, it is easy to produce three divided strain generating portions.

このように、本発明によれば、捻り歪みの小さい起歪部を容易に構成することによって精度の高い重量値を得ることができる。   As described above, according to the present invention, a highly accurate weight value can be obtained by easily configuring a strain generating portion having a small torsional strain.

本発明の実施形態に係るロードセルを示す斜視図である。It is a perspective view which shows the load cell which concerns on embodiment of this invention. 図１のロードセルを示す平面図である。It is a top view which shows the load cell of FIG. 図２におけるＡーＡ断面図である。It is AA sectional drawing in FIG. 図１の実施形態のロードセルの変形例を示す斜視図である。It is a perspective view which shows the modification of the load cell of embodiment of FIG. 図４のロードセルを示す平面図である。It is a top view which shows the load cell of FIG. 図１のロードセルの起歪部断面と従来のロードセルの起歪部断面を示す図である。It is a figure which shows the distortion part cross section of the load cell of FIG. 1, and the distortion part cross section of the conventional load cell. 図４の実施形態のロードセルの変形例を示す平面図である。It is a top view which shows the modification of the load cell of embodiment of FIG.

以下、本発明の実施形態を、図面を参照しながら詳細に説明する。本発明の実施形態の説明に先立って、本発明の実施形態の前提となる構成を有する参考例について説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Prior to the description of the embodiment of the present invention, a reference example having a configuration that is a premise of the embodiment of the present invention will be described.

(参考例)
図１は、参考例のロードセルの斜視図であり、図２はその平面図であり、図３は図２におけるＡーＡ断面図である。 ( Reference example )
1 is a perspective view of a load cell of a reference example , FIG. 2 is a plan view thereof, and FIG. 3 is a cross-sectional view taken along line AA in FIG.

この参考例のロードセル１は、角ブロック状のアルミニウム合金やＳＵＳなどの金属素材の内部を横方向に切削貫通した平行四辺形型のロードセルである。このロードセル１は、計量装置のベースなどに固定支持される縦長の固定部２と、計測荷重を受ける縦長の可動部３と、固定部２と可動部３の上下箇所をそれぞれ水平に連結する上ビーム部４及び下ビーム部５とを備えている。上下の各ビーム部４，５は、固定部２と可動部３とに亘って延在し、その延在方向(図２の左右方向)の両端寄り、すなわち、固定部２寄り及び可動部３寄りの各２箇所には、内部空間側から湾曲切削されて薄肉の起歪部６がそれぞれ形成され、各起歪部６の外面に歪ゲージ７がそれぞれ貼着される。 The load cell 1 of this reference example is a parallelogram type load cell that cuts and penetrates the inside of a metal material such as a square block-shaped aluminum alloy or SUS. The load cell 1 horizontally connects a vertically long fixed portion 2 fixedly supported on a base of a weighing device, a vertically long movable portion 3 that receives a measurement load, and upper and lower portions of the fixed portion 2 and the movable portion 3 respectively. A beam portion 4 and a lower beam portion 5 are provided. Each of the upper and lower beam portions 4 and 5 extends over the fixed portion 2 and the movable portion 3, and is closer to both ends in the extending direction (left and right direction in FIG. 2), that is, closer to the fixed portion 2 and the movable portion 3. The thin strain-generating portions 6 are respectively formed by bending cutting from the inner space side at each of the two locations, and the strain gauges 7 are respectively attached to the outer surfaces of the strain-generating portions 6.

各起歪部６におけるビーム延在方向に直交する方向(図２の上下方向、図３の左右方向)の２箇所には、上下方向に貫通する円形の貫通孔８，８がそれぞれ形成され、各起歪部６が、前記直交する方向に分断並列された３つの分割起歪部６ａ，６ｂ，６ｃで構成されている。起歪部の分割は円形貫通孔によってなされるので製作が容易である。   Circular through-holes 8 and 8 penetrating in the vertical direction are formed at two locations in the direction perpendicular to the beam extending direction in each strain generating portion 6 (vertical direction in FIG. 2 and horizontal direction in FIG. 3), respectively. Each strain generating portion 6 is composed of three divided strain generating portions 6a, 6b, 6c that are divided in parallel in the orthogonal direction. The division of the strain generating portion is made by a circular through hole, so that the manufacture is easy.

次に、図１に示すロードセルの分割起歪部と、上記特許文献１(特開２０１２−６３３０７号)における従来の平行四辺形型ロードセルの起歪部の断面を図６において比較する。   Next, FIG. 6 compares the section of the strain generating portion of the load cell shown in FIG. 1 and the section of the conventional parallelogram load cell in Patent Document 1 (Japanese Patent Laid-Open No. 2012-63307).

従来のロードセルの起歪部の断面二次モーメントＩ１及び断面係数Ｚ１はそれぞれＩ１＝（１／１２）・（２ｂ１＋ｂ２）・ｈ１3、Ｚ１＝（１／６）・（２ｂ１＋ｂ２）・ｈ１2であり、図１に示すロードセルの分割起歪部の合成断面二次モーメントＩ２、及び合成断面係数Ｚ２もそれぞれＩ１、Ｚ１と同じ値であるとする。 The sectional secondary moment I1 and section modulus Z1 of the strained portion of the conventional load cell are I1 = (1/12) · (2b1 + b2) · h1 3 and Z1 = (1/6) · (2b1 + b2) · h1 2 , respectively. The combined sectional secondary moment I2 and the combined section modulus Z2 of the split strain generating portion of the load cell shown in FIG. 1 are also assumed to be the same values as I1 and Z1, respectively.

平行四辺形ロードセルの固定部と可動部とに亘って延在する上下ビームの延在方向の中心軸Ｌから左右方向の何れかに離れた位置ｐに物品を載置すると固定部と可動部の間に形成された起歪部に大きい捻り力が作用する。   When the article is placed at a position p away from the central axis L in the extending direction of the upper and lower beams extending over the fixed portion and the movable portion of the parallelogram load cell, the fixed portion and the movable portion A large twisting force acts on the strain-generating portion formed therebetween.

従来のロードセルにおいて、同じ定格荷重であるが、捻り力Ｆに対する耐力の高い起歪部を持つロードセルを製作するには、図６において点線で示すように起歪部の厚みｈ１をｈ１’に縮小する代わりに幅を（２ｂ１＋ｂ２）から（２ｂ１＋ｂ２）’に拡大させ、起歪部の位置を計量台に作用する偏荷重Ｆに近づける。しかし、厚みｈ１’を薄くしてゆくと、起歪部の加工精度にはバラツキがあるので、生産するロードセルの起歪部の厚みにバラツキが大きくなり、定格容量に対する荷重信号の大きさのバラツキが拡大する。したがって起歪部の横幅の拡大には限界がある。   In the conventional load cell, in order to manufacture a load cell having the same rated load but having a strain-generating portion having a high resistance to torsional force F, the thickness h1 of the strain-generating portion is reduced to h1 ′ as shown by a dotted line in FIG. Instead, the width is increased from (2b1 + b2) to (2b1 + b2) ′, and the position of the strain-generating portion is brought close to the offset load F acting on the weighing table. However, as the thickness h1 ′ is reduced, the processing accuracy of the strain-generating portion varies, so the thickness of the strain-generating portion of the load cell to be produced increases, and the load signal size varies with the rated capacity. Expands. Therefore, there is a limit to the enlargement of the lateral width of the strain generating portion.

これに対して同じ定格容量の、すなわち、定格荷重を負荷したとき同じ大きさの荷重信号を出力するロードセルを製作するととき、分割起歪部を形成する前には、１つの起歪部の横幅を従来の捻り力に対する耐力の高い起歪部を持つロードセルのものよりさらに広くし、その代わりに１つの起歪部の中心軸Ｌを挟んで左右の位置に、上下方向に貫通する円形の貫通孔８、８をそれぞれ設け、該貫通孔８、８によって複数に分割された分割起歪部における合成断面二次モーメントＩ２及び合成断面係数Ｚ２を、前記耐力の高いロードセルが持つ１つの起歪部の断面二次モーメントＩ１及び断面係数Ｚ１と等しくする。   On the other hand, when a load cell having the same rated capacity, that is, a load cell that outputs a load signal of the same magnitude when a rated load is applied, the width of one strained portion is formed before the split strained portion is formed. Is made wider than that of a conventional load cell having a strain-generating portion having high resistance to torsional force, and instead, a circular penetration penetrating vertically in the left and right positions across the central axis L of one strain-generating portion A single strain-generating portion having a high yield strength load cell having the combined sectional secondary moment I2 and the combined sectional modulus Z2 in the split strain-generating portion divided into a plurality of holes 8 and 8 respectively. The sectional secondary moment I1 and the section modulus Z1 are made equal.

円形孔を設けて起歪部を複数に分割するので、同じ定格容量のロードセルを製作するについて、分割された起歪部の厚みは従来の１つの起歪部で構成される高い捻り耐力のロードセルの場合の厚みを維持することができる。   Since the strain generating part is divided into a plurality of parts by providing a circular hole, the load cell having the same rated capacity is manufactured. The thickness of the divided strain generating part is a conventional load cell having a high torsional resistance composed of one strain generating part In this case, the thickness can be maintained.

すなわち、ロードセルの定格荷重は同じであるが、起歪部の厚みを薄くしすぎることなく、中心軸Ｌより遠い位置に起歪部を形成し、１つの起歪部で構成された捻り力の耐性の高い従来のロードセルより偏荷重の着力点に近い位置で偏荷重を支持するようにすることで、より捻り力に対する耐性の高いロードセルが製作できる。   That is, the load cell has the same rated load, but the strain portion is formed at a position far from the central axis L without excessively reducing the thickness of the strain portion, and the torsional force constituted by one strain portion is formed. A load cell with higher resistance to twisting force can be manufactured by supporting the offset load at a position closer to the point of application of the offset load than the conventional load cell having high resistance.

(実施形態１)
図４，図５に、本発明の実施形態に係るロードセルの斜視図及び平面図が示されており、図１及び図３に対応する部分には、同一の参照符号を付す。 (Working-shaped state 1)
Figure 4, Figure 5, there is shown a perspective view and a plan view of the load cell according to the implementation embodiments of the present invention is, portions corresponding to FIGS. 1 and 3, the same reference characters.

このロードセル１１は、基本的には上記参考例と同様に構成されており、角ブロック状の金属素材の内部を切削貫通して、計量装置のベースなどに固定支持される縦長の固定部２と計測荷重を受ける縦長の可動部３との上下箇所を、水平な上ビーム部４と下ビーム部５でそれぞれ連結している。これら上ビーム部４及び下ビーム部５の両端部を内部空間側から湾曲切削して、薄肉の起歪部６１をそれぞれ形成すると共に、各起歪部６１の外面に歪ゲージ７を貼着した平行四辺形型に構成されている。 The load cell 1 1 is basically has the same structure as the above Reference Example, the inside of the corner block-shaped metal material by cutting through, elongated stationary part 2 which is fixedly supported, etc. to the base of the metering device And the vertically long movable part 3 that receives the measurement load are connected by a horizontal upper beam part 4 and a lower beam part 5, respectively. These on both ends of the beam portion 4 and the lower beam section 5 is curved cutting from the inner space side, thereby forming a strain generating portion 61 of the thin-walled, respectively, bonded strain gauges 7 on the outer surface of the strain generating portion 61 Constructed in a parallelogram shape.

各起歪部６1におけるビーム延在方向に直交する方向(図５の上下方向)の２箇所には、図１、図２に示すロードセルに対して部分円弧状の貫通孔８1が形成され、各起歪部６1が、前記直交する方向に分断並列された３つの分割起歪部６1ａ，６1ｂ，６1ｃで構成されている。 Partial arc-shaped through holes 8 1 are formed in the load cells shown in FIGS. 1 and 2 at two locations in the direction perpendicular to the beam extending direction (up and down direction in FIG. 5) in each strain generating portion 6 1 . Each strain generating portion 6 1 is composed of three divided strain generating portions 6 1 a, 6 1 b, and 6 1 c that are divided in parallel in the orthogonal direction.

また、分割起歪部６1ａ，６1ｂ，６1ｃの内の中央の分割起歪部６1ｂの外面に歪ゲージ７が貼着されている。 Further, a strain gauge 7 is attached to the outer surface of the central divided strain generating portion 6 1 b among the divided strain generating portions 6 1 a, 6 1 b, 6 1 c.

このように構成されたロードセル１１は、上記参考例と同様に、捻り力に対する耐性が高いという性能を発揮する。更に、分割起歪部６１ａ，６１ｂ，６１ｃを分断する貫通孔８１が部分円弧状であるために、中央の分割起歪部６１ｂのビーム延在方向(図５の左右方向)の両端部に、ゲージ貼着部位に比べて、前記直交する方向（図５の上下方向）に幅の狭い連結部１４がそれぞれ形成されている。各連結部１４は、分割起歪部６１ｂと、その両側の剛体部である固定部２、可動部３、あるいは、各ビーム部４，５とを連結する。 The load cell 1 1 configured as described above, as in the above Reference Example, the resistance to twisting force is exerted the performance high. Furthermore, in order through hole 81 that divides the divided strain generating section 6 1 a, 6 1 b, 6 1 c is a partial arc shape, the center of the division strain generating portion 6 1 b of the beam extending direction (Fig. 5 The connecting portions 14 having a narrow width in the orthogonal direction (up and down direction in FIG. 5) are formed at both end portions in the right and left directions) as compared with the gauge attaching portion. Each connecting portion 14 connects the split strain generating portion 6 1 b and the fixed portion 2, the movable portion 3, or the beam portions 4 and 5, which are rigid body portions on both sides thereof.

この実施形態では、ロードセル１の可動部３に印加された偏荷重によって発生した捻り応力が、幅の狭い連結部１４で吸収されて分割起歪部６１ｂの歪ゲージ７に伝達されにくくなり、捻り応力に起因する荷重信号の誤差を減少することができる。 In this embodiment, the torsional stress generated by the eccentric load applied to the movable portion 3 of the load cell 1 is absorbed by the narrow connecting portion 14 and is not easily transmitted to the strain gauge 7 of the split strain generating portion 6 1 b. The error of the load signal due to the torsional stress can be reduced.

図７は上記貫通孔８1を円形貫通孔によって形成し、加工を容易にしたものである。 7 are those of the through-hole 81 is formed by a circular through-hole, and facilitate processing.

１，１1 ロードセル
２ 固定部
３ 可動部
４ 上ビーム部
５ 下ビーム部
６，６1 起歪部
６ａ，６1ａ 分割起歪部
６ｂ，６1ｂ 分割起歪部
６ｃ，６1ｃ 分割起歪部
７ 歪ゲージ
８，８1 貫通孔
９ 空間
１４ 連結部 1,1 1 load cell 2 on the fixed part 3 movable portion 4 beam portion 5 lower beam parts 6 1 strain-generating-portions 6a, 6 1 a division strain generating section 6b, 6 1 b divided strain generating portion 6c, 6 1 c dividing Strain generation part 7 Strain gauge 8, 8 1 Through hole 9 Space 14 Connection part

Claims (2)

固定支持される固定部と、荷重を受ける可動部と、前記固定部及び前記可動部の上部を連結する上ビーム部と、前記固定部及び前記可動部の下部を連結する下ビーム部とを備え、前記上及び下の各ビーム部には、固定部寄り及び可動部寄りの２箇所に、荷重検出用の起歪部がそれぞれ形成されると共に、各起歪部に歪ゲージがそれぞれ貼着される平行四辺形型のロードセルであって、
前記各起歪部は、前記固定部と前記可動部とに亘って延在する前記各ビーム部の延在方向に直交する方向に沿って、三つの分割起歪部が並列にそれぞれ形成されており、
前記三つの分割起歪部の内、中央の分割起歪部に前記歪ゲージが貼着され、
前記中央の分割起歪部は、前記延在方向に沿う両端部に、該分割起歪部と剛体部とを連結する連結部をそれぞれ有し、前記連結部の前記直交する方向に沿う幅が、前記歪ゲージの貼着部位の前記直交する方向に沿う幅に比べて狭く形成されたことを特徴とするロードセル。 A fixed portion that is fixedly supported; a movable portion that receives a load; an upper beam portion that connects the fixed portion and an upper portion of the movable portion; and a lower beam portion that connects the lower portion of the fixed portion and the movable portion. The upper and lower beam portions are respectively provided with strain detecting portions for load detection at two locations near the fixed portion and the movable portion, and a strain gauge is attached to each strain generating portion. A parallelogram type load cell,
Each of the strain generating portions includes three divided strain generating portions formed in parallel along a direction orthogonal to the extending direction of each of the beam portions extending across the fixed portion and the movable portion. And
Of the three divided strain generating portions, the strain gauge is attached to the central divided strain generating portion,
The central divided strain generating portion has a connecting portion for connecting the divided strain generating portion and the rigid body portion at both ends along the extending direction, and the width of the connecting portion along the orthogonal direction is The load cell is formed narrower than the width along the orthogonal direction of the bonded part of the strain gauge . 前記三つの分割起歪部を、前記各ビーム部の延在方向に直交する方向において、上下に貫通させた円形貫通孔によって形成した、
請求項１に記載のロードセル。 The three divided strain generating portions are formed by circular through holes vertically penetrated in a direction orthogonal to the extending direction of each beam portion,
The load cell according to claim 1.
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