JP7836086B2 - load cell - Google Patents
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- JP7836086B2 JP7836086B2 JP2022211925A JP2022211925A JP7836086B2 JP 7836086 B2 JP7836086 B2 JP 7836086B2 JP 2022211925 A JP2022211925 A JP 2022211925A JP 2022211925 A JP2022211925 A JP 2022211925A JP 7836086 B2 JP7836086 B2 JP 7836086B2
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Description
本発明は、高さが低く薄型でありながら、加工が容易で高精度なロードセルに関するものである。 This invention relates to a load cell that is low in height and thin, yet easy to process and highly accurate.
特許文献１においては、例えば図４の斜視図に示すように、ロードセルの起歪体１１は、金属ブロックから切削加工により切り出されている。起歪体１１の中心に位置する円柱状の荷重受部１２の周囲に環状の枠体部１３が配置され、荷重受部１２と枠体部１３間には、角柱状の例えば３個の可動梁部１４が放射状に掛け渡されている。 In Patent Document 1, for example, as shown in the perspective view of Figure 4, the strain-generating body 11 of the load cell is cut from a metal block by machining. An annular frame 13 is arranged around a cylindrical load-receiving portion 12 located at the center of the strain-generating body 11, and three, for example, rectangular prism-shaped movable beam portions 14 are radially positioned between the load-receiving portion 12 and the frame 13.
各可動梁部１４の一端は荷重受部１２に直接連結され、他端は枠体部１３に設けた壁部１５を介して枠体部１３に接合されている。この壁部１５は可動梁部１４に対して直交するような向きにして枠体部１３上に配置され、その両側の端縁の下部において枠体部１３と一体にされており、壁部１５は可動梁部１４の方向に可撓性を有している。 One end of each movable beam section 14 is directly connected to the load-receiving section 12, and the other end is joined to the frame section 13 via a wall section 15 provided on the frame section 13. This wall section 15 is positioned on the frame section 13 in a direction perpendicular to the movable beam section 14, and its lower edges on both sides are integrated with the frame section 13. The wall section 15 is flexible in the direction of the movable beam section 14.
可動梁部１４には、水平方向に横切る楕円形の孔部１６が穿孔され、ロバーバル機構が構成されている。孔部１６の上下面の薄肉梁部には、それぞれ歪みゲージ１７が貼り付けられている。なお、荷重受部１２には負荷荷重に連結するためのねじ孔１８が穿孔されている。 The movable beam section 14 has an elliptical hole 16 drilled horizontally, forming a Roberval mechanism. Strain gauges 17 are attached to the thin-walled beam sections on the upper and lower surfaces of the hole 16. The load-receiving section 12 has screw holes 18 for connecting to the load.
荷重受部１２に負荷荷重を上下方向に掛けると、荷重は３等分され、各可動梁部１４において、ホイートストンブリッジ回路を構成する歪みゲージ１７によって荷重を測定することができるので、各歪みゲージ１７の出力を加算すればよい。この場合に可動梁部１４には、荷重に比例して発生する曲げ歪み以外の張力による変形が生ずる。この変形はヒステリシスに影響を与えるが、枠体部１３上に設けた壁部１５が可動梁部１４の方向に撓むことによりこの余分な変形が吸収されるので、歪みゲージ１７の出力はこのヒステリシスの影響を受けずに、荷重を測定することができる。 When a load is applied vertically to the load-receiving section 12, the load is divided into three equal parts. The load can be measured at each movable beam section 14 using the strain gauges 17 that constitute the Wheatstone bridge circuit. Therefore, the outputs of each strain gauge 17 can be added together. In this case, deformation occurs in the movable beam section 14 due to tension other than the bending strain that occurs in proportion to the load. This deformation affects hysteresis, but this excess deformation is absorbed by the wall section 15, which is provided on the frame section 13, bending in the direction of the movable beam section 14. Therefore, the output of the strain gauges 17 can measure the load without being affected by this hysteresis.
しかし、この従来のロードセルは、図５に示すように、荷重受部１２に上方からの荷重Ｆａを加えた場合に、壁部１５の両下端部が固定され、中間部が可撓性を有するので、壁部１５の中央部上部には可動梁部１４方向に圧縮応力、下部には引張応力が発生し、壁部１５の長手方向の軸線を中心とする矢印のような回転モーメントＭａが生ずる。また、図６に示すように、荷重受部１２に下方からの荷重Ｆｂを加えた場合に、壁部１５には矢印のような回転モーメントＭｂが同様に発生する。これらの回転モーメントＭは歪みゲージ１７の出力に加わって、測定精度を低下させる原因となる。 However, in this conventional load cell, as shown in Figure 5, when a load Fa is applied from above to the load-receiving section 12, both lower ends of the wall section 15 are fixed, while the intermediate section is flexible. Therefore, compressive stress is generated in the upper central part of the wall section 15 in the direction of the movable beam section 14, and tensile stress is generated in the lower part, resulting in a rotational moment Ma, as indicated by the arrow, centered on the longitudinal axis of the wall section 15. Similarly, as shown in Figure 6, when a load Fb is applied from below to the load-receiving section 12, a rotational moment Mb, as indicated by the arrow, is generated in the wall section 15. These rotational moments M are added to the output of the strain gauge 17, causing a decrease in measurement accuracy.
本発明の目的は、上述の課題を解消し、歪みゲージを貼り付けた第１の可動梁部に加わる回転モーメントの作用を減少すると共に、余分な変形ヒステリシスを効果的に吸収するために、可撓板部を用いた撓み機構を採用することにより、高精度の出力が得られるロードセルを提供することにある。 The objective of the present invention is to solve the above-mentioned problems and provide a load cell that can obtain high-precision output by employing a deflection mechanism using a flexible plate to reduce the rotational moment applied to the first movable beam portion to which the strain gauge is attached, and to effectively absorb excess deformation hysteresis.
上記目的を達成するための本発明に係るロードセルは、一体の金属製ブロックを加工して形成した起歪体を有し、該起歪体は、中心部に荷重受部、外側周囲に環状の枠体部を配置し、孔部を設けると共に歪みゲージを貼付した複数個の角柱状の第１の可動梁部を前記荷重受部から外側に向けて水平かつ放射状に突出し、前記枠体部上に前記第１の可動梁部の長手方向と直交する方向に第２の可動梁部を配置し、該第２の可動梁部の長手方向の中央部に前記第１の可動梁部の端部を連結したロードセルにおいて、前記第２の可動梁部は、断面を角型とし、前記枠体部上に接合した両側の端縁と前記中央部との間に撓み機構をそれぞれ設け、前記撓み機構は、前記中央部と前記両側の端縁とのそれぞれの間に、２枚の板体を平行に掛け渡し、前記２枚の板体間に上下方向に貫通したスリット状の溝部を設けたことを特徴とする。 To achieve the above objective, the load cell according to the present invention has a strain generating body formed by processing a single metal block, the strain generating body has a load receiving portion in the center and an annular frame portion on its outer circumference, a plurality of rectangular prism-shaped first movable beam portions having holes and to which strain gauges are attached projecting horizontally and radially outward from the load receiving portion, a second movable beam portion is arranged on the frame portion in a direction perpendicular to the longitudinal direction of the first movable beam portion, and the end of the first movable beam portion is connected to the center of the longitudinal direction of the second movable beam portion, wherein the second movable beam portion has a rectangular cross-section, a deflection mechanism is provided between the two end edges joined on the frame portion and the central portion, the deflection mechanism is characterized in that two plates are stretched parallel between the central portion and the two end edges, and a slit-shaped groove portion is provided between the two plates that penetrates in the vertical direction .
本発明に係るロードセルは、第１の可動梁部と枠体部間に第２の可動梁部を配置し、第２の可動梁部の機能により、精度の良い計測値が得られる。 The load cell according to the present invention has a second movable beam positioned between the first movable beam and the frame, and accurate measurement values can be obtained through the function of the second movable beam.
本発明を図１～図３に図示の実施例に基づいて詳細に説明する。
図１は本実施例のロードセルの斜視図、図２は平面図である。なお、従来例と同一の符号は同一の部位を示している。
The present invention will be described in detail based on the embodiments shown in Figures 1 to 3.
Figure 1 is a perspective view of the load cell in this embodiment, and Figure 2 is a plan view. Note that the same reference numerals as in the conventional example indicate the same parts.
起歪体１１は、鋼、アルミニウム等から成る一体の金属ブロックを、旋盤、フライス盤等によって切削加工をして形成されている。起歪体１１の中心に上下方向に配置された円柱状の荷重受部１２の周囲に、環状の枠体部１３が離隔して配置され、荷重受部１２と枠体部１３間には、角柱状の例えば３個の第１の可動梁部１４が放射状に掛け渡されている。 The strain-generating body 11 is formed by machining a single metal block made of steel, aluminum, etc., using a lathe, milling machine, etc. A cylindrical load-receiving portion 12 is positioned vertically at the center of the strain-generating body 11, and an annular frame portion 13 is spaced apart around it. Between the load-receiving portion 12 and the frame portion 13, for example, three rectangular prism-shaped first movable beam portions 14 are radially arranged.
各第１の可動梁部１４の一端は、荷重受部１２に直接に連結されているが、他端は第２の可動梁部２１を介して枠体部１３に連結されている。第２の可動梁部２１は第１の可動梁部１４の長手方向に対し直交するように配置され、枠体部１３上の３個所に設けられた断面角型の長形部材である。 Each first movable beam section 14 has one end directly connected to the load-receiving section 12, while its other end is connected to the frame section 13 via a second movable beam section 21. The second movable beam section 21 is positioned perpendicular to the longitudinal direction of the first movable beam section 14 and is a rectangular member with a square cross-section, provided at three locations on the frame section 13.
第２の可動梁部２１の両側の端縁２２の下部は、枠体部１３に一体に接合されており、端縁２２間の中央部２３を含む中間部は枠体部１３から上方に離隔されており、第２の可動梁部２１の中央部２３に第１の可動梁部１４の他端が接合されている。 The lower parts of the edges 22 on both sides of the second movable beam section 21 are integrally joined to the frame section 13. The intermediate section, including the central section 23 between the edges 22, is separated upward from the frame section 13, and the other end of the first movable beam section 14 is joined to the central section 23 of the second movable beam section 21.
第２の可動梁部２１の中央部２３と両側の端縁２２間には、それぞれ撓み機構が構成されており、この撓み機構では板厚方向に可撓性を有する２枚の平行な板体２４ａ、２４ｂが間隙をおいて対向して配列されている。つまり、２枚の板体２４ａ、２４ｂの間には、上下方向に貫通するスリット状の溝部２５が形成されている。 A bending mechanism is configured between the central portion 23 and both end edges 22 of the second movable beam portion 21. In this bending mechanism, two parallel plates 24a and 24b, which are flexible in the thickness direction, are arranged opposite each other with a gap between them. In other words, a slit-shaped groove 25, penetrating in the vertical direction, is formed between the two plates 24a and 24b.
第１の可動梁部１４のロバーバル機構を構成する孔部１６の上下面の薄肉梁部にはそれぞれ計４個の歪みゲージ１７が貼付されている。歪みゲージ１７に接続された図示しないリード線は第１の可動梁部１４に沿って布線され、４個の歪みゲージ１７によりホイートストンブリッジ回路が構成されているが、下部の歪みゲージ１７は図示を省略している。 Four strain gauges 17 are attached to the thin-walled beam sections on the upper and lower surfaces of the holes 16 that constitute the Roberval mechanism of the first movable beam section 14. Lead wires (not shown) connected to the strain gauges 17 are routed along the first movable beam section 14, forming a Wheatstone bridge circuit with the four strain gauges 17; however, the lower strain gauge 17 is omitted from the illustration.
なお、荷重受部１２には負荷荷重に連結するためのねじ孔１８が穿孔されており、枠体部１３には起歪体１１を他部材に固定するための複数個の透孔１９が形成されている。 Furthermore, the load-receiving portion 12 has screw holes 18 for connecting to the load, and the frame portion 13 has multiple through-holes 19 for fixing the strain-generating body 11 to other members.
実施例の第２の可動梁部２１の寸法を例示すると、枠体部１３の直径は８４ｍｍであり、第２の可動梁部２１の水平方向の長さは４６ｍｍ、水平方向の厚みは５ｍｍ、上下方向の高さは８ｍｍ、板体２４ａ、２４ｂの長さは１２．５ｍｍ、厚みは各１ｍｍ、板体２４ａ、２４ｂ同士の間隙である溝部２５の内幅は３ｍｍである。 As an example of the dimensions of the second movable beam section 21 in this embodiment, the diameter of the frame section 13 is 84 mm, the horizontal length of the second movable beam section 21 is 46 mm, the horizontal thickness is 5 mm, the vertical height is 8 mm, the length of the plates 24a and 24b is 12.5 mm, the thickness of each is 1 mm, and the inner width of the groove section 25, which is the gap between the plates 24a and 24b, is 3 mm.
なお、図４に示す従来例の壁部１５の長さは４６ｍｍ、厚みは２ｍｍ、上下方向の高さは８ｍｍである。 In the conventional example shown in Figure 4, the length of the wall section 15 is 46 mm, the thickness is 2 mm, and the vertical height is 8 mm.
荷重受部１２を介して、この起歪体１１に測定すべき荷重を負荷すると、荷重は３等分され、荷重受部１２と枠体部１３との間に介在する第１の可動梁部１４は薄肉梁部が変形し、貼付された歪みゲージ１７によって加わる荷重を測定することができ、３個の第１の可動梁部１４の歪みゲージ１７による出力を加算すればよい。 When the load to be measured is applied to the strain-generating body 11 via the load-receiving section 12, the load is divided into three equal parts. The first movable beam section 14, interposed between the load-receiving section 12 and the frame section 13, deforms, and the applied load can be measured by the attached strain gauges 17. The outputs from the strain gauges 17 of the three first movable beam sections 14 can then be added together.
このとき、図３に誇張して示すように、荷重受部１２に荷重Ｆが加わると、第２の可動梁部２１は２枚の板体２４ａ、２４ｂによる撓み機構によって、第１の可動梁部１４の方向に効果的に中央部２３が撓むことが可能であり、従来例の壁部１５と同様に、荷重による曲げ歪み以外の張力による変形の影響を吸収することができる。 At this time, as exaggeratedly shown in Figure 3, when a load F is applied to the load-receiving section 12, the second movable beam section 21 can effectively flex its central section 23 in the direction of the first movable beam section 14 through a deflection mechanism formed by the two plates 24a and 24b. Similar to the wall section 15 in the conventional example, it can absorb the effects of deformation due to tension other than bending strain caused by the load.
この場合に、第２の可動梁部２１の板体２４ａ、２４ｂの厚みは各１ｍｍで合計２ｍｍであり、従来例の厚み２ｍｍと一致するが、第２の可動梁部２１は撓み易い板厚１ｍｍの板体２４ａ、２４ｂによる撓み機構を採用しているために、従来例よりも柔軟性があり、余分な張力を十分に吸収することが可能となる。 In this case, the thickness of the plates 24a and 24b of the second movable beam section 21 is 1 mm each, totaling 2 mm. While this matches the 2 mm thickness of the conventional example, the second movable beam section 21 employs a bending mechanism using 1 mm thick plates 24a and 24b, making it more flexible than the conventional example and capable of adequately absorbing excess tension.
また、従来例のロードセルにおいては、前述したように、壁部１５がその長手方向の軸線を中心に回転し易く、この回転モーメントＭが歪みゲージ１７の出力に相乗し測定値に影響を及ぼすことが避けられなかった。しかし、本実施例に係るロードセルでは、第２の可動梁部２１は第１の可動梁部１４の方向に５ｍｍの肉厚であり、従来例の２ｍｍの肉厚に比較して十分に大きく、上述の回転モーメントＭは発生しても、その大きさは肉厚に反比例して小さくなり、従来例の２／５程度となる。 Furthermore, in conventional load cells, as mentioned above, the wall portion 15 easily rotates around its longitudinal axis, and this rotational moment M inevitably affects the output of the strain gauge 17, in conjunction with the measured value. However, in the load cell according to this embodiment, the second movable beam portion 21 has a wall thickness of 5 mm in the direction of the first movable beam portion 14, which is significantly larger than the 2 mm wall thickness of the conventional example. Therefore, even if the aforementioned rotational moment M occurs, its magnitude decreases inversely proportional to the wall thickness, becoming approximately 2/5 of that of the conventional example.
従って、本実施例の第２の可動梁部２１は、撓み機構による従来例以上の可撓性を有しながら、発生する回転モーメントＭが従来例よりも小さくなるので、その分測定精度が向上する。 Therefore, the second movable beam section 21 of this embodiment has greater flexibility than conventional examples due to its deflection mechanism, while the rotational moment M generated is smaller than in conventional examples, thus improving measurement accuracy.
起歪体１１において、第１の可動梁部１４、第２の可動梁部２１は枠体部１３の上方に位置しているので、これらの可動梁部１４、２１は他部位に阻害されることなく、必要な切削加工が可能となる。 In the strain-generating body 11, the first movable beam section 14 and the second movable beam section 21 are located above the frame section 13. Therefore, these movable beam sections 14 and 21 can be machined as needed without being obstructed by other parts.
また本実施例において、第１の可動梁部１４はロバーバル構造としたことを説明したが、孔部１６を水平方向に貫通させなくとも、孔部１６の中間を行き止まり状態とし、この行き止まり部に歪みゲージ１７を貼付し、第１の可動梁部１４における剪断応力を測定して、負荷荷重を求めることもできる。 Furthermore, although the first movable beam section 14 was described as having a Roberval structure in this embodiment, it is also possible to determine the load by making the middle of the hole 16 a dead end, attaching a strain gauge 17 to this dead end, and measuring the shear stress in the first movable beam section 14, even without extending the hole 16 horizontally.
なお、第１の可動梁部１４は３方向だけでなく、対向する２方向や、十字形の４方向やその他の複数方向に掛け渡しをすることもできる。これらの場合にも、第２の可動梁部２１は第１の可動梁部１４ごとに設けることになる。 Furthermore, the first movable beam section 14 can be spanned not only in three directions, but also in two opposing directions, four directions in a cross shape, or in other multiple directions. In these cases as well, the second movable beam section 21 will be provided for each first movable beam section 14.
１１ 起歪体
１２ 荷重受部
１３ 枠体部
１４ 第１の可動梁部
１６ 孔部
１７ 歪みゲージ
２１ 第２の可動梁部
２２ 端縁
２３ 中央部
２４ａ、２４ｂ 板体
２５ 溝部
11 Strain-generating body 12 Load-receiving part 13 Frame part 14 First movable beam part 16 Hole part 17 Strain gauge 21 Second movable beam part 22 Edge 23 Center part 24a, 24b Plate part 25 Groove part
Claims (3)
前記第２の可動梁部は、断面を角型とし、前記枠体部上に接合した両側の端縁と前記中央部との間に撓み機構をそれぞれ設け、
前記撓み機構は、前記中央部と前記両側の端縁とのそれぞれの間に、２枚の板体を平行に掛け渡し、前記２枚の板体間に上下方向に貫通したスリット状の溝部を設けたことを特徴とするロードセル。 A load cell having a strain generating body formed by processing a single metal block, the strain generating body having a load receiving portion in the center and an annular frame portion around its outer circumference, with a plurality of rectangular prismatic first movable beam portions having holes and to which strain gauges are attached, projecting horizontally and radially outward from the load receiving portion, a second movable beam portion positioned on the frame portion in a direction perpendicular to the longitudinal direction of the first movable beam portion, and the end of the first movable beam portion connected to the center of the longitudinal direction of the second movable beam portion,
The second movable beam section has a square cross-section, and a bending mechanism is provided between the two end edges joined to the frame section and the central section.
The aforementioned bending mechanism is a load cell characterized by having two plates placed parallel to each other between the central portion and the edges on both sides, and a slit-shaped groove that penetrates vertically between the two plates.
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| JP2962703B1 (en) * | 1998-04-27 | 1999-10-12 | 株式会社昭和測器 | Load cell |
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| JP2005121603A (en) | 2003-10-20 | 2005-05-12 | A & D Co Ltd | Rotational torque detector |
| US20130291653A1 (en) | 2012-05-01 | 2013-11-07 | Honeywell International Inc. | Three-axis low profile load cell and sensing beam |
| JP2016070673A (en) | 2014-09-26 | 2016-05-09 | 株式会社レプトリノ | Force sensor |
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| JP2024094976A (en) | 2024-07-10 |
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