JP3746670B2 - Tuning fork vibration type load sensor - Google Patents

Tuning fork vibration type load sensor Download PDF

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Publication number
JP3746670B2
JP3746670B2 JP2000324418A JP2000324418A JP3746670B2 JP 3746670 B2 JP3746670 B2 JP 3746670B2 JP 2000324418 A JP2000324418 A JP 2000324418A JP 2000324418 A JP2000324418 A JP 2000324418A JP 3746670 B2 JP3746670 B2 JP 3746670B2
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Japan
Prior art keywords
load
lever
point
tuning fork
tension piece
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Expired - Lifetime
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JP2000324418A
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Japanese (ja)
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JP2002131148A (en
Inventor
直也 篠崎
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Shinko Denshi Co Ltd
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Shinko Denshi Co Ltd
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Priority to JP2000324418A priority Critical patent/JP3746670B2/en
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【０００１】
【発明の属する技術分野】
本発明は、荷重受部に受けた荷重を音叉振動子を介して検出する音叉振動式荷重センサに関するものである。
【０００２】
【従来の技術】
従来のこの種の音叉振動式荷重センサには、例えば本出願人による特公平３−４９０５９号公報に開示されているような同一金属部材から成る荷重変換機構が使用されている。図３に示すように、この荷重変換機構の基部１の一部にはてこ部２の支点２ａが支持されており、てこ部２の力点２ｂと基部１の固定部との間には音叉振動子３が配置され、てこ部２の荷重点２ｃには荷重Ｆを受ける荷重受部４が引張片５を介して接続されている。引張片５の形状は、てこ部２の荷重点２ｃと荷重受部４の荷重作用点４ａを結ぶ鉛直線に対して左右対称とされているように、その鉛直線に沿って一様とされている。
【０００３】
【発明が解決しようとする課題】
しかしながら上述の荷重変換機構は、荷重Ｆとは別の妨害的な外力の影響を除去して良好な測定精度を得ることができるという利点を有している反面で、引張片５の形状がてこ部２の荷重点２ｃと荷重受部４の荷重作用点４ａを結ぶ鉛直線に対して左右対称、かつこの鉛直線に沿って一様となっているので、荷重受部４が荷重Ｆを受けた際に、図４に示すようにてこ部２が傾斜すると、引張片５のてこ比を決めるてこ部２との接続部分５ａが変形し、荷重作用点４ａが荷重点２ｃを通る鉛直線からずれた位置に至るために引張片５に応力が発生する。この応力は、荷重変換機構による測定値の直線性や再現性に悪影響を及ぼす上に、耐久性にも問題を及ぼすことがある。
【０００４】
本発明の目的は、上述の問題点を解消し、直線性や再現性に優れた測定値を得ることができると共に耐久性を向上させ得る音叉振動式荷重センサを提供することにある。
【０００５】
【課題を解決するための手段】
上記目的を達成するための本発明に係る音叉振動式荷重センサは、基部の一部に接続したてこ部と、該てこ部の力点と前記基部の固定部との間に接続した音叉振動子と、前記てこ部の荷重点に薄板状の引張片を介して接続した荷重受部とを板状の同一金属部材から形成して成る音叉振動式荷重センサにおいて、前記てこ部の荷重点に前記てこ部と平行に前記引張片の一部である第２の部分を連結し、前記てこ部の荷重点と前記荷重受部の荷重作用点とを結ぶ鉛直線に対して前記引張片に左右非対称部分を形成し、前記荷重受部に荷重が加わると、前記てこ部と第２の部分の相対的位置関係を維持すると共に、前記引張片の左右非対称部分はその一部を変形して、前記荷重受部の荷重作用点が前記てこ部の荷重点を通る鉛直線上の位置に復元するようにしたことを特徴とする。
【０００６】
【発明の実施の形態】
本発明を図１、図２に図示の実施の形態に基づいて詳細に説明する。
図１は実施の形態の正面図であり、この実施の形態に係る音叉振動式荷重センサは、圧電素子１１ａ、１１ｂ、増幅器１２、周波数カウンタ１３及びこれらを接続するリード線を除いて同一金属部材から一体に加工されている。基部１４には例えば２つの取付孔１４ａ、１４ｂが形成されており、基部１４の上部にはてこ部１５が支点１５ａの薄肉部１６を介して支持されている。てこ部１５の力点１５ｂには音叉振動子１７が接続され、てこ部１５の荷重点１５ｃには薄板状の引張片１８を介して荷重受部１９が接続されている。この荷重受部１９には測定すべき荷重Ｆを受けるための図示しない部材が掛けられる孔１９ａが設けられ、この孔１９ａの下部は荷重Ｆが作用する荷重作用点１９ｂとされている。
【０００７】
音叉振動子１７は軸線に対称かつ平行な２枚の長片状の振動片２１ａ、２１ｂと、これらの振動片２１ａ、２１ｂの上下の両端部同士をそれぞれ結合する略コ字状の結合部２２ａ、２２ｂと、これらの結合部２２ａ、２２ｂを軸線上でそれぞれ支持する薄板状の支持片２３ａ、２３ｂとから構成されている。上方の支持片２３ａはてこ部１５の力点１５ｂに接続され、下方の支持片２３ｂは基部１４の突部１４ｃに接続されている。
【０００８】
なお、上述の圧電素子１１ａ、１１ｂは持続振動発生用とされ、音叉振動子１７の例えば下方の結合部２２ｂの両側面にそれぞれ取り付けられている。圧電素子１１ａ、１１ｂには上述の増幅器１２の入力部と出力部がそれぞれ接続され、一方の圧電素子１１ａは振動用とされ、他方の圧電素子１１ｂはピックアップ用とされている。そして、増幅器１２には上述の周波数カウンタ１３が接続され、増幅器１２の利得や周波数特性を適切に選択すると振動片２１ａ、２１ｂが音叉振動子１７に加わった荷重に対応した固有周波数で対称的に振動するので、周波数カウンタ１３によって荷重値の表示が可能とされている。
【０００９】
ここで、引張片１８の形状は、てこ部１５の荷重点１５ｃと荷重受部１９の荷重作用点１９ｂとを結ぶ鉛直線Ａに対して左右非対称とされていると共に、鉛直線Ａに沿って変形されている。即ち、引張片１８にはてこ部１５の荷重点１５ｃから下方に直線状に延在する第１の部分３１と、この第１の部分３１の下端から直交する両方向に延在する第２の部分３２と、この第２の部分３２の例えば外側の一端から厚肉で弯曲しながら下方に延在する第３の部分３３と、この第３の部分３３の下端から鉛直線Ａの方向に斜めに延在する第４の部分３４と、この第４の部分３４の下端から下方に直線状に延在する第５の部分３５とが設けられ、この第５の部分３５の下端に上述の荷重受部１９が接続されている。第１の部分３１と第５の部分３５は鉛直線Ａ上に配置され、第２の部分３２の上面とてこ部１５の下面との間には間隔ｄが与えられている。
【００１０】
荷重受部１９が測定すべき荷重Ｆを受けると、その荷重Ｆが引張片１８及びてこ部１５を介して音叉振動子１７に作用し、音叉振動子１７に引張荷重Ｆが加わる。これにより、音叉振動子１７の振動片２１ａ、２１ｂが引張荷重Ｆに対応する固有振動数で対称的に振動し、それらの振動が増幅器１２に入力し、周波数カウンタ１３が荷重値を表示する。
【００１１】
このとき図２に示すように、てこ部１５は荷重Ｆにより右下がりに傾斜する。また、この荷重Ｆにより引張片１８の第２の部分３２に右回りの回転モーメントが加わり、第２の部分３２は右下がりに傾く。この第２の部分３２の傾斜角は引張片１８の形状によって調整することが可能であり、てこ部１５の右下がりの傾斜角と概ね一致させることができる。この条件下では、てこ部１５の下面と引張片１８の第２の部分３２の上面は平行になり、この間隔ｄ、てこ部１５、引張片１８の第１の部分３１及び第２の部分３２の相対位置を変化させることがない。
【００１３】
【発明の効果】
以上説明したように本発明に係る音叉振動式荷重センサは、引張片の形状をてこ部の荷重点と荷重受部の荷重作用点とを結ぶ直線に対して左右非対称としたので、てこ部が傾斜してもてこ部と引張片のてこ部側との相対位置を変形させることがなく、そこに不要な応力を発生させることがない。従って、直線性や再現性に優れた測定値を得ることができる上に、耐久性を向上させることができる。
【図面の簡単な説明】
【図１】実施の形態の正面図である。
【図２】てこ部と引張片の作用説明図である。
【図３】従来例の部分正面図である。
【図４】従来例のてこ部と引張片の作用説明図である。
【符号の説明】
１４ 基部
１５ てこ部
１５ａ 支点
１５ｂ 力点
１５ｃ 荷重点
１７ 音叉振動子
１８ 引張片
１９ 荷重受部
１９ａ 孔
１９ｂ 荷重作用点
３１ 第１の部分
３２ 第２の部分
３３ 第３の部分
３４ 第４の部分
３５ 第５の部分[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tuning fork vibration type load sensor that detects a load received by a load receiving portion via a tuning fork vibrator.
[0002]
[Prior art]
In this type of conventional tuning fork vibration type load sensor, for example, a load conversion mechanism made of the same metal member as disclosed in Japanese Patent Publication No. 3-49059 by the present applicant is used. As shown in FIG. 3, a fulcrum 2 a of the lever portion 2 is supported on a part of the base portion 1 of this load conversion mechanism, and a tuning fork vibration is generated between the force point 2 b of the lever portion 2 and the fixed portion of the base portion 1. A child 3 is arranged, and a load receiving portion 4 that receives a load F is connected to a load point 2 c of the lever portion 2 via a tension piece 5. The shape of the tensile member 5, as is symmetrical with respect to the lead line connecting the load acting point 4a of the load point 2c and the load receiving part 4 of the lever 2, is uniform along the lead linear ing.
[0003]
[Problems to be solved by the invention]
However, the above-described load conversion mechanism has the advantage that good measurement accuracy can be obtained by removing the influence of disturbing external force different from the load F, but the shape of the tension piece 5 is leveraged. symmetrical with respect to the lead line connecting the load acting point 4a of the load point 2c and the load receiving part 4 parts 2, and since has become a uniform along the lead straight, load receiving portion 4 receives the load F When the lever portion 2 is inclined as shown in FIG. 4, the connecting portion 5a with the lever portion 2 that determines the lever ratio of the tension piece 5 is deformed, and the load application point 4a is changed from the vertical line passing through the load point 2c. In order to reach the shifted position, stress is generated in the tension piece 5 . This stress adversely affects the linearity and reproducibility of the measurement values obtained by the load conversion mechanism, and may also have a problem with durability.
[0004]
An object of the present invention is to provide a tuning fork vibration type load sensor that can solve the above-described problems, obtain a measurement value excellent in linearity and reproducibility, and improve durability.
[0005]
[Means for Solving the Problems]
To achieve the above object, a tuning fork vibration type load sensor according to the present invention includes a lever connected to a part of a base, and a tuning fork vibrator connected between a power point of the lever and a fixed part of the base. A tuning fork vibration type load sensor comprising a load receiving portion connected to a load point of the lever portion via a thin plate-like tension piece made of the same plate-like metal member, wherein the lever is applied to the load point of the lever portion. A second portion which is a part of the tension piece in parallel with the portion, and an asymmetrical portion on the tension piece with respect to a vertical line connecting a load point of the lever portion and a load application point of the load receiving portion. When the load is applied to the load receiving portion, the relative positional relationship between the lever portion and the second portion is maintained, and the left-right asymmetric portion of the tension piece deforms a part thereof, and the load The load application point of the receiving part is restored to the position on the vertical line passing through the load point of the lever part. Characterized in that way the.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the embodiment shown in FIGS.
FIG. 1 is a front view of an embodiment, and a tuning fork vibration type load sensor according to this embodiment is the same metal member except for the piezoelectric elements 11a and 11b, the amplifier 12, the frequency counter 13 and the lead wire connecting them. It is processed integrally from. For example, two mounting holes 14 a and 14 b are formed in the base portion 14, and a lever portion 15 is supported on the upper portion of the base portion 14 via a thin portion 16 of a fulcrum 15 a. A tuning fork vibrator 17 is connected to the force point 15 b of the lever portion 15, and a load receiving portion 19 is connected to a load point 15 c of the lever portion 15 via a thin plate-like tension piece 18. The load receiving portion 19 is provided with a hole 19a on which a member (not shown) for receiving the load F to be measured is applied, and a lower portion of the hole 19a is a load application point 19b on which the load F acts.
[0007]
The tuning fork vibrator 17 has two long pieces of vibrating pieces 21a and 21b that are symmetric and parallel to the axis, and a substantially U-shaped connecting portion 22a that connects the upper and lower ends of the vibrating pieces 21a and 21b. , 22b and thin plate-like support pieces 23a, 23b that respectively support the coupling portions 22a, 22b on the axis. The upper support piece 23 a is connected to the force point 15 b of the lever portion 15, and the lower support piece 23 b is connected to the protrusion 14 c of the base portion 14.
[0008]
The piezoelectric elements 11a and 11b described above are for generating continuous vibration, and are attached to both side surfaces of the coupling portion 22b below the tuning fork vibrator 17, for example. The piezoelectric element 11a, 11b is connected to the input part and the output part of the amplifier 12, respectively. One piezoelectric element 11a is used for vibration and the other piezoelectric element 11b is used for pickup. The frequency counter 13 is connected to the amplifier 12, and when the gain and frequency characteristics of the amplifier 12 are appropriately selected, the resonator elements 21 a and 21 b are symmetrical at a natural frequency corresponding to the load applied to the tuning fork vibrator 17. Since it vibrates, the frequency counter 13 can display the load value.
[0009]
Here, the shape of the tensile member 18, with which is asymmetrical with respect to the lead line A connecting the load action point 19b of the loading point 15c and the load receiving portion 19 of the lever portion 15, along the lead line A It has been transformed. That is, the tension piece 18 has a first portion 31 extending linearly downward from the load point 15 c of the lever portion 15 and a second portion extending in both directions orthogonal to the lower end of the first portion 31. 32, a third portion 33 that extends downward while curving in thick this example the outer end of the second portion 32, diagonally from the lower end of the third portion 33 in the direction of the lead line a A fourth portion 34 that extends and a fifth portion 35 that linearly extends downward from the lower end of the fourth portion 34 are provided, and the above-described load receiving portion is provided at the lower end of the fifth portion 35. The part 19 is connected. A first portion 31 fifth portion 35 of is disposed on the lead straight A, are given distance d between the lower surface of the upper surface and the lever portion 15 of the second portion 32.
[0010]
When the load receiving portion 19 receives the load F to be measured, the load F acts on the tuning fork vibrator 17 via the tension piece 18 and the lever portion 15, and the tensile load F is applied to the tuning fork vibrator 17. As a result, the vibrating bars 21a and 21b of the tuning fork vibrator 17 vibrate symmetrically at the natural frequency corresponding to the tensile load F, the vibrations are input to the amplifier 12, and the frequency counter 13 displays the load value.
[0011]
At this time, as shown in FIG. 2, the lever portion 15 is inclined downward by the load F. Further, the load F applies a clockwise rotational moment to the second portion 32 of the tension piece 18, and the second portion 32 tilts downward. The inclination angle of the second portion 32 can be adjusted by the shape of the tension piece 18, and can be made substantially coincident with the inclination angle of the lever portion 15 that falls to the right. Under this condition, the lower surface of the lever portion 15 and the upper surface of the second portion 32 of the tension piece 18 are parallel to each other, and the distance d, the lever portion 15, the first portion 31 and the second portion 32 of the tension piece 18. The relative position of is not changed .
[0013]
【The invention's effect】
As described above, in the tuning fork vibration type load sensor according to the present invention, the shape of the tension piece is asymmetrical with respect to the straight line connecting the load point of the lever part and the load application point of the load receiving part. Even if it is inclined, the relative position between the lever portion and the lever portion side of the tension piece is not deformed, and unnecessary stress is not generated there. Therefore, it is possible to obtain a measurement value excellent in linearity and reproducibility and improve durability.
[Brief description of the drawings]
FIG. 1 is a front view of an embodiment.
FIG. 2 is an operation explanatory view of a lever part and a tension piece.
FIG. 3 is a partial front view of a conventional example.
FIG. 4 is an operation explanatory view of a lever part and a tension piece in a conventional example.
[Explanation of symbols]
14 base 15 lever 15a fulcrum 15b force 15c load point 17 tuning fork vibrator 18 tension piece 19 load receiving portion 19a hole 19b load application point 31 first part 32 second part 33 third part 34 fourth part 35 5th part

Claims (2)

基部の一部に接続したてこ部と、該てこ部の力点と前記基部の固定部との間に接続した音叉振動子と、前記てこ部の荷重点に薄板状の引張片を介して接続した荷重受部とを板状の同一金属部材から形成して成る音叉振動式荷重センサにおいて、前記てこ部の荷重点に前記てこ部と平行に前記引張片の一部である第２の部分を連結し、前記てこ部の荷重点と前記荷重受部の荷重作用点とを結ぶ鉛直線に対して前記引張片に左右非対称部分を形成し、前記荷重受部に荷重が加わると、前記てこ部と第２の部分の相対的位置関係を維持すると共に、前記引張片の左右非対称部分はその一部を変形して、前記荷重受部の荷重作用点が前記てこ部の荷重点を通る鉛直線上の位置に復元するようにしたことを特徴とする音叉振動式荷重センサ。A lever connected to a part of the base, a tuning fork vibrator connected between the force point of the lever and the fixed part of the base, and a load point of the lever connected to the load point of the lever via a thin plate-like tension piece A tuning fork vibration type load sensor in which a load receiving portion is formed of the same metal member having a plate shape, and a second portion which is a part of the tension piece is connected to a load point of the lever portion parallel to the lever portion. And forming a left-right asymmetric part in the tension piece with respect to a vertical line connecting the load point of the lever part and the load application point of the load receiving part, and when a load is applied to the load receiving part, While maintaining the relative positional relationship of the second part, the left-right asymmetric part of the tension piece deforms a part thereof, and the load acting point of the load receiving part is on the vertical line passing through the load point of the lever part. A tuning fork vibration type load sensor characterized by being restored to a position. 前記引張片の一部に前記第２の部分の外側の一端から厚肉で弯曲しながら下方に延在する第３の部分を設け、該第３の部分は前記第２の部分に加わる回転モーメントにより変形を行うことを特徴とする請求項１に記載の音叉振動式荷重センサ。  A portion of the tension piece is provided with a third portion that extends downward while bending thickly from one end outside the second portion, and the third portion is a rotational moment applied to the second portion. The tuning fork vibration type load sensor according to claim 1, wherein the tuning fork vibration type load sensor according to claim 1 is deformed.
JP2000324418A 2000-10-24 2000-10-24 Tuning fork vibration type load sensor Expired - Lifetime JP3746670B2 (en)

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JP3746670B2 true JP3746670B2 (en) 2006-02-15

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JP2006138714A (en) * 2004-11-11 2006-06-01 Shinko Denshi Kk Weighing apparatus with built-in calibration device
JP2009121950A (en) * 2007-11-15 2009-06-04 Shinko Denshi Kk Tuning-fork vibration type load sensor
CN202661155U (en) 2009-06-30 2013-01-09 新光电子株式会社 Component force buffer device and platform scale using component force buffer devices
CN202631091U (en) 2009-06-30 2012-12-26 新光电子株式会社 Platform scale and load detection unit
CN109883580B (en) * 2019-03-19 2020-11-17 西安交通大学 Full quartz differential type resonance pressure sensor chip

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