JPS622241B2 - - Google Patents
Info
- Publication number
- JPS622241B2 JPS622241B2 JP2107684A JP2107684A JPS622241B2 JP S622241 B2 JPS622241 B2 JP S622241B2 JP 2107684 A JP2107684 A JP 2107684A JP 2107684 A JP2107684 A JP 2107684A JP S622241 B2 JPS622241 B2 JP S622241B2
- Authority
- JP
- Japan
- Prior art keywords
- vertical connecting
- load cell
- connecting beam
- 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
Links
- 230000005484 gravity Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/24—Guides or linkages for ensuring parallel motion of the weigh-pans
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Force In General (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は片持ちの平行たわみ梁を起歪体とする
ロードセル（ビーム型ロードセル）を使用する計
量器に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a measuring instrument using a load cell (beam-type load cell) having a cantilevered parallel flexible beam as a strain body.
従来例の構成とその問題点
片持ちの平行たわみ梁を起歪体とする（一般に
ビーム型起歪体と言う）ことは公知であり、例え
ばU.S.P2866059に代表される方式が最も多く利
用されている。Conventional configurations and their problems It is well known that a cantilevered parallel flexible beam is used as a strain body (generally referred to as a beam type strain body), and for example, the system represented by USP2866059 is most commonly used. .
まず第１図によりそのような従来例を説明する
と、１はビーム型起歪体で、固定台２に支持さ
れ、自由端に当板３を介して受皿（載せ台）４を
取付ける。周知のように金属角材に穴５，６とス
リツト７をあけて平行な梁８，９を形成し、薄肉
部分１０，１１，１２に歪ゲージを貼付けてあ
る。荷重時の変位は図中２点鎖線に示すようにな
る。 First, such a conventional example will be explained with reference to FIG. 1. Reference numeral 1 is a beam-type strain-generating body, which is supported by a fixed base 2, and has a receiving plate (mounting base) 4 attached to its free end via a contact plate 3. As is well known, holes 5, 6 and slits 7 are formed in a square metal piece to form parallel beams 8, 9, and strain gauges are attached to thin parts 10, 11, 12. The displacement under load is shown by the two-dot chain line in the figure.
上記構造に於ける問題点は、強制的にたわませ
られる薄肉部分１０，１１，１２をヒンジ点と考
える平行運動機構において、２つの薄肉部分１
０，１１を結ぶ仮想的なたての連結梁を考えると
き、この連結梁より先端側に片寄つて常時荷重が
あり、この連結梁に生ずる回転能率によつて常
時、上側の梁８には引張力が下側の梁９には圧縮
力が働いていることである。従つて、平行たわみ
梁の薄肉部分を均等な寸法に加工しても、歪み量
すなわち歪ゲージの抵抗変化を互に均等な関係に
維持することが出来ない。 The problem with the above structure is that in a parallel motion mechanism that considers the forcibly deflected thin parts 10, 11, and 12 as hinge points, the two thin parts 1
When considering a hypothetical vertical connecting beam connecting 0 and 11, there is always a load on the tip side of this connecting beam, and the upper beam 8 is always under tension due to the rotational efficiency generated in this connecting beam. This means that a compressive force is acting on the beam 9 on the lower side. Therefore, even if the thin portions of the parallel flexible beams are machined to have uniform dimensions, it is not possible to maintain the amount of strain, that is, the resistance change of the strain gauge, in an equal relationship.
すなわち計量を開始する以前から、すでに偏つ
た初期荷重が加えられており、しかもロードセル
の長さ方向にみた受皿の位置が対象的でなくな
り、誤差の拡大すなわち器差の量を大きくする欠
点があつた。 In other words, a biased initial load is already applied before measurement begins, and the position of the tray in the length direction of the load cell is no longer symmetrical, which has the disadvantage of increasing errors, that is, increasing the amount of instrumental error. Ta.
発明の目的
本発明はこのような従来の欠点を除去するもの
であり、２ゲージ法ないし４ゲージ法による各ゲ
ージの初期抵抗値の均一化、及び、起歪体各部寸
法の均等化を企り、ロードセルを合理的に構成し
ようとするものである。Purpose of the Invention The present invention aims to eliminate such conventional drawbacks, and attempts to equalize the initial resistance value of each gauge by the 2-gauge method or the 4-gauge method, and equalize the dimensions of each part of the strain-generating body. , which attempts to rationally configure a load cell.
発明の構成
本発明の計量は、片持ちの平行たわみ梁を起歪
体としたロードセル自由端側の上下２箇所の強制
たわみ点を結ぶ仮想たて連結梁を設けると共に、
そのたて連結梁より先端側部分が前記たて連結梁
に与える回転能率（w1l1）と計量器の皿が前記た
て連結梁に与える回転能率（w2l2）とが相等しく
反対方向になる位置（l2＝ｗ１／ｗ２l1）まで、前記皿
の重
心位置を前記たて連結梁からロードセル固定端側
に偏寄させたものである。Structure of the Invention The measurement of the present invention includes the provision of a virtual vertical connecting beam that connects two forced deflection points, upper and lower, on the free end side of a load cell using a cantilevered parallel deflection beam as a strain body.
The rotation efficiency (w 1 l 1 ) given by the tip end side of the vertical connection beam to the vertical connection beam (w 1 l 1 ) is equal to the rotation efficiency (w 2 l 2 ) given to the vertical connection beam by the pan of the measuring instrument. The center of gravity of the plate is shifted from the vertical connecting beam to the load cell fixed end side to a position in the opposite direction (l 2 =w 1 /w 2 l 1 ).
実施例の説明
以下本発明の一実施例を第２図、第３図及びそ
の構造をロバーバルの機構に沿つて模型化した説
明図の第４図によつて説明する。DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3, and FIG. 4, which is an explanatory diagram showing a model of the structure along the Roberval mechanism.
１４はロードセルユニツトの支持台、１５はロ
ードセル（起歪体）、１６は抜き穴で、薄肉部分
１７，１８，１９，２０を形成する。２１はロー
ドセル１５の自由端側に取付けた当板で、この当
板から２枚の板２２，２３をロードセル固定端側
にはり出して皿受け枠２４に平行に固定する。皿
受け枠２４なロードセル本体を非接触に囲うよう
な構造で上面に受皿２５を固着してある。 Reference numeral 14 denotes a support stand for the load cell unit, 15 denotes a load cell (flexible body), and 16 denotes a punched hole, forming thin portions 17, 18, 19, and 20. Reference numeral 21 denotes a contact plate attached to the free end side of the load cell 15, and two plates 22 and 23 are protruded from this contact plate to the load cell fixed end side and fixed in parallel to the pan receiving frame 24. A tray receiving frame 24 has a structure that surrounds the load cell main body without contact, and a tray 25 is fixed to the upper surface.
ここで、ロードセルの構造をロバーバルの機構
に対比して考えると理解し易い。薄肉部分１７，
１８，１９，２０はそれぞれヒンジ１７′，１
８′，１９′，２０′に相当するから、仮想的な連
結梁２６，２７はそれぞれたて連結棒２６′、支
柱２７′に相当する。仮想的なたて連結梁２６，
２６′を想定すると、従来例では、先端側の重量
w1が重心３０に集つていると考え、たて連結梁
２６，２６′から重心までの距離l1とすればw1l1の
回転能率（第４図矢印Ａ）が働き梁２８，２８′
を１７，１７′点で左に引き、梁２９，２９′を１
８，１８′点で右に押す。２つの梁２８，２９，
２８′，２９′には相反する反力fl3を与えて、受
け皿部分の倒れを防いでいる。本装置に於いて
は、この反力ｆを生じないでw1l1の回転能率を打
ち消すために、受け皿部分の重量w2が重心３１
に集つていると考え、たて連結梁２６，２６′か
ら重心３１までの距離をl2にとり、前記の回転能
率w1l1と相等しく、方向反対の回転能率w2l2（第
４図矢印Ｂ）を生じさせる。すなわち受皿の取付
けをl2＝ｗ１／ｗ２l1になるように構成する。このよう
に
すると、梁２８，２８′を左に引き、梁２９，２
９′を右に押す作用力を打ち消し、たて連結梁２
６，２６′にはたて方向の荷重（w1＋w2）のみが
働くことになる。 Here, it is easier to understand the structure of a load cell by comparing it with the Roberval mechanism. Thin part 17,
18, 19, 20 are hinges 17', 1, respectively
8', 19', and 20', the virtual connecting beams 26 and 27 correspond to the vertical connecting rod 26' and the support column 27', respectively. Virtual vertical connecting beam 26,
Assuming 26′, in the conventional example, the weight on the tip side
Considering that w 1 is concentrated at the center of gravity 30, and the distance from the vertical connecting beams 26, 26' to the center of gravity is l 1 , the rotational efficiency of w 1 l 1 (arrow A in Figure 4) works on the beams 28, 28. ′
to the left at points 17, 17', and beams 29, 29' to 1
Push to the right at the 8,18' point. two beams 28, 29,
Opposite reaction forces fl 3 are applied to 28' and 29' to prevent the saucer portion from falling. In this device, in order to cancel the rotational efficiency of w 1 l 1 without generating this reaction force f, the weight w 2 of the saucer part is set at the center of gravity 31
Considering that the distance from the vertical connecting beams 26, 26' to the center of gravity 31 is l 2 , the rotational efficiency w 2 l 2 ( fourth giving rise to figure arrow B). That is, the attachment of the saucer is configured so that l 2 =w 1 /w 2 l 1 . By doing this, the beams 28 and 28' are pulled to the left, and the beams 29 and 2
9′ to the right is canceled and the vertical connecting beam 2
Only the load (w 1 +w 2 ) in the vertical direction acts on 6 and 26'.
なお前述の構成は無負荷時のつり合いについて
考慮したものであるが、ロードセルが比較的小型
であるにかかわらず、受皿が大きく計量範囲が広
い場合には、定格秤量の平均値w3を受皿の重心
位置に加えて、回転能率の関係をw1l1＝（w2＋
w3）l2となる位置l2に受皿を設置すれば、広い計
量範囲にわたつて、平均的に感度特性を補償でき
る。 Note that the above configuration takes into consideration the balance when no load is applied, but even if the load cell is relatively small, if the tray is large and the weighing range is wide, then the average value of the rated weight w 3 can be set to In addition to the center of gravity position, the relationship between rotational efficiency is w 1 l 1 = (w 2 +
By installing the saucer at the position l 2 where w 3 ) l 2 , the sensitivity characteristics can be compensated on average over a wide measurement range.
発明の効果
以上説明したように、本発明によれば、２ゲー
ジ法又は４ゲージ法での各歪ゲージの特性をほぼ
均等にでき、ブリツジの平行性が良くなる、引
張・圧縮力が打ち消されるから各梁構造を薄型・
軽量化できる、起歪体薄肉部の寸法を均一にで
き、品質の管理が容易になる等の効果が得られる
ものである。Effects of the Invention As explained above, according to the present invention, the characteristics of each strain gauge in the 2-gauge method or the 4-gauge method can be made almost equal, the parallelism of the bridges is improved, and the tensile and compressive forces are canceled. Each beam structure is made thin and
Effects such as weight reduction, uniformity of the dimensions of the thin portion of the strain-generating body, and ease of quality control can be obtained.
第１図は従来の計量器の正面図、第２図は本発
明の一実施例における計量器の正面図、第３図は
その斜視図、第４図はその模式図である。
１４……支持台、１５……ロードセル、１６…
…抜き穴、１７，１８，１９，２０……薄肉部
分、２１……当板、２２，２３……板、２４……
皿受け枠、２５……受皿、２６，２７……連結
梁。
FIG. 1 is a front view of a conventional measuring instrument, FIG. 2 is a front view of a measuring instrument according to an embodiment of the present invention, FIG. 3 is a perspective view thereof, and FIG. 4 is a schematic diagram thereof. 14...Support stand, 15...Load cell, 16...
...Punch hole, 17, 18, 19, 20... Thin wall part, 21... Back plate, 22, 23... Board, 24...
Plate receiving frame, 25...Plate, 26, 27...Connection beam.
Claims (1)
セル自由端側の上下２箇所の強制たわみ点を結ぶ
仮想たて連結梁を設けると共に、そのたて連結梁
より先端側部分が前記たて連結梁に与える回転能
率（w1l1）と計量器の皿が前記たて連結梁に与え
る回転能率（w2l2）とが相等しく反対方向になる
位置（l2＝ｗ１／ｗ２l1）まで、前記皿の重心位置を前
記た て連結梁からロードセル固定端側に偏寄させてな
る計量器。 ２ たて連結梁より先端側部分の回転能率
（w1l1）と秤量器皿の重心上に定格秤量までの平均
荷重w3を加えた場合の前記たて連結梁に与える
回転能率（w2＋w3）l2が相等しく反対方向になる
位置（l2＝ｗ１／ｗ２＋ｗ３l1）に、皿の重心位置をロ
ード セルの固定端側に偏寄させてなる特許請求の範囲
第１項記載の計量器。[Claims] 1. An imaginary vertical connecting beam connecting two forced deflection points, upper and lower, on the free end side of a load cell using a cantilevered parallel flexible beam as a strain body is provided, and a virtual vertical connecting beam is provided on the tip side of the vertical connecting beam. The position ( l 2 = w 1 /w 2 l 1 ), the center of gravity of the plate is shifted from the vertical connecting beam toward the fixed end of the load cell. 2 Rotational efficiency of the tip side of the vertical connecting beam (w 1 l 1 ) and rotational efficiency given to the vertical connecting beam ( w 2 +w 3 )l 2 are equal and in opposite directions (l 2 =w 1 /w 2 +w 3 l 1 ), and the center of gravity of the plate is shifted toward the fixed end side of the load cell. The measuring instrument described in item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2107684A JPS59150315A (en) | 1984-02-07 | 1984-02-07 | Weight-measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2107684A JPS59150315A (en) | 1984-02-07 | 1984-02-07 | Weight-measuring apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59150315A JPS59150315A (en) | 1984-08-28 |
| JPS622241B2 true JPS622241B2 (en) | 1987-01-19 |
Family
ID=12044795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2107684A Granted JPS59150315A (en) | 1984-02-07 | 1984-02-07 | Weight-measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59150315A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2632400A1 (en) * | 1988-06-02 | 1989-12-08 | Esselte Moreau Sa | FORCE SENSOR DEVICE FOR MEASURING APPARATUS, ESPECIALLY A WEIGHING INSTRUMENT, WITH INTEGRATED DAMPING SYSTEM |
-
1984
- 1984-02-07 JP JP2107684A patent/JPS59150315A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59150315A (en) | 1984-08-28 |
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