JPH022524B2 - - Google Patents
Info
- Publication number
- JPH022524B2 JPH022524B2 JP56071649A JP7164981A JPH022524B2 JP H022524 B2 JPH022524 B2 JP H022524B2 JP 56071649 A JP56071649 A JP 56071649A JP 7164981 A JP7164981 A JP 7164981A JP H022524 B2 JPH022524 B2 JP H022524B2
- Authority
- JP
- Japan
- Prior art keywords
- strain
- hole
- load cell
- elastic body
- slit
- 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 - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 14
- 238000005452 bending Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims 1
- 239000003566 sealing material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring 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
- G01L1/22—Measuring 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
- G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
- G01L1/2218—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction
- G01L1/2225—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction the direction being perpendicular to the central axis
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Force In General (AREA)
Description
【発明の詳細な説明】
この発明は、ロードセルに関し、特に耐湿密閉
構造の梁剪断歪検出型および梁曲げ歪検出型のロ
ードセルに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load cell, and more particularly to a beam shear strain detection type load cell and a beam bending strain detection type load cell having a moisture-resistant sealed structure.
従来のロードセルには第１図及び第２図に示す
ようなものがあつた。両図において、１は両持起
歪弾性体梁、２は応力集中孔、３はストレインゲ
ージ、４は支持部である。このロードセルは、ス
トレインゲージ３を応力集中孔２の外側に位置す
る起歪弾性体梁１の部分に固着しているので、湿
度その他の周囲環境等の影響を受けやすい。そこ
で、このロードセルは起歪弾性体梁１の周囲にケ
ーシング５を配置し、これの上縁部及び支持部４
の下縁部にそれぞれダイヤフラム等の封止材６，
７を接着して、ストレインゲージ３を密封し湿度
その他の周囲環境の影響を受けないようにしてあ
るが、起歪弾性体梁１とケーシング５とを組立ね
ばならず製作が面倒であつた。しかも、封止材
６，７は起歪弾性体１を完全に被わなければなら
ないので当然に直径が大きくなり、小容量のもの
では周囲温度の変化に起因する内圧変化の影響を
受けて、ロードセル出力特性が不安定になつてい
た。さらに封止材６，７と起歪弾性体梁１やケー
シング５との嵌合摩擦の程度によるヒステリシス
現象によつてもロードセル出力特性が不安定にな
つていた。 Conventional load cells include those shown in FIGS. 1 and 2. In both figures, 1 is a double-supported strain elastic beam, 2 is a stress concentration hole, 3 is a strain gauge, and 4 is a support portion. In this load cell, the strain gauge 3 is fixed to a portion of the strain elastic beam 1 located outside the stress concentration hole 2, so that it is susceptible to the effects of humidity and other surrounding environments. Therefore, in this load cell, a casing 5 is arranged around the strain elastic beam 1, and the upper edge of the casing 5 and the support part 4 are arranged around the elastic member 1.
A sealing material such as a diaphragm 6,
7 is bonded to seal the strain gauge 3 so that it is not affected by humidity or other surrounding environment, but the strain gauge 3 has to be assembled with the strain elastic beam 1 and the casing 5, which is cumbersome to manufacture. Furthermore, since the sealing materials 6 and 7 must completely cover the strain elastic body 1, their diameters naturally become large, and in the case of small-capacity sealing materials, they are susceptible to changes in internal pressure caused by changes in ambient temperature. The load cell output characteristics were becoming unstable. Furthermore, the output characteristics of the load cell became unstable due to a hysteresis phenomenon caused by the degree of fitting friction between the sealing materials 6 and 7 and the strain elastic beam 1 and the casing 5.
この発明は製作が容易であると共に肉圧変化や
ヒステリシス現象の影響を受けず出力特性が安定
であるロードセルを提供することを目的とする。
以下、この発明を図示の１実施例に基づいて説明
する。 An object of the present invention is to provide a load cell that is easy to manufacture and has stable output characteristics without being affected by changes in wall pressure or hysteresis.
The present invention will be explained below based on one embodiment shown in the drawings.
実施例のロードセルは第３図乃至第５図に示す
ように概略直方体状の弾性体１０を有している。
この弾性体１０の上面１２の中央部には着力部１
４が形成されており、下面１６の中央部には荷重
支持用の突出部１８が形成されている。着力部１
４と突出部１８との中心を連なぐ荷重支着力軸２
０（第４図参照）に直交してかつ弾性体１０の前
面２２及び後面２４を貫通するようにスリツト２
６が形成されており、このスリツト２６はその両
端部が前面２２、後面２４の両端よりそれぞれ内
側に位置するように形成されている。このように
スリツト２６を形成することによつて、スリツト
２６より上部の弾性体１０は両持起歪弾性体梁２
８とされ、スリツト２６下部の弾性体１０は荷重
支持台３０とされている。 The load cell of the embodiment has an elastic body 10 having a substantially rectangular parallelepiped shape, as shown in FIGS. 3 to 5.
A force applying portion 1 is provided at the center of the upper surface 12 of this elastic body 10.
4 is formed, and a load supporting protrusion 18 is formed at the center of the lower surface 16. Force application part 1
4 and the center of the protrusion 18.
0 (see FIG. 4) and extends through the front surface 22 and rear surface 24 of the elastic body 10.
6 is formed, and this slit 26 is formed such that both ends thereof are located inside of both ends of the front surface 22 and the rear surface 24, respectively. By forming the slit 26 in this way, the elastic body 10 above the slit 26 can be used as the elastic body beam 2.
8, and the elastic body 10 below the slit 26 is used as a load support base 30.
この両持起歪弾性体梁２８には歪検出応力集中
孔３２，３４が穿設されている。これらは着力部
１４に荷重を印加した際における両持起歪弾性体
梁２８の曲げ応力中性軸３６に中心を置くように
弾性体１０の左面３８、右面４０よりそれぞれ内
側に向つて穿設された円筒形の孔である。これら
歪検出応力集中孔３２，３４のかなり内側位置の
前後方向の内壁には、曲げ応力中性軸３６を基準
にして相対向するようにストレインゲージ４２，
４２，４４，４４が貼着されている。このように
ストレインゲージ４２，４２，４４，４４を貼着
したことにより、ストレインゲージ４２，４２，
４４，４４は梁剪断歪を検出する。また、曲げ応
力中性軸３６を基準にして歪検出応力集中孔３
２，３４の上下方向に単軸ストレインゲージを貼
着すると、これらストレインゲージは曲げ歪を検
出する。 Strain detection stress concentration holes 32 and 34 are bored in this both-supported strain elastic beam 28. These are drilled inward from the left side 38 and right side 40 of the elastic body 10, respectively, so that the center is centered on the bending stress neutral axis 36 of the double-supported strain elastic body beam 28 when a load is applied to the force application part 14. It is a cylindrical hole. Strain gauges 42 are disposed on the inner walls of the strain detection stress concentration holes 32 and 34 in the longitudinal direction at positions considerably inside thereof, so as to face each other with respect to the bending stress neutral axis 36.
42, 44, 44 are attached. By pasting the strain gauges 42, 42, 44, 44 in this way, the strain gauges 42, 42, 44,
44, 44 detect beam shear strain. In addition, the strain detection stress concentration hole 3 is
When uniaxial strain gauges are attached in the vertical direction of 2 and 34, these strain gauges detect bending strain.
歪検出応力集中孔３４の開口端縁には非常に薄
いダイヤフラム４６がこの開口を被蓋するように
溶接または半田ロウ付けによつて固着されてい
る。これによつて歪検出応力集中孔３４は完全密
封されている。また歪検出応力集中孔３２の開口
端縁にはハーメチツカリ端子部材４８がこの開口
を被蓋するように固着されている。この部材４８
の各端子にはストレインゲージ４２，４２から導
出されたリード線及びストレインゲージ４４，４
４から導通管５０を介して導出されたリード線が
接続されている。 A very thin diaphragm 46 is fixed to the opening edge of the strain detection stress concentration hole 34 by welding or soldering so as to cover this opening. As a result, the strain detection stress concentration hole 34 is completely sealed. Further, a hermetic terminal member 48 is fixed to the opening edge of the strain detection stress concentration hole 32 so as to cover this opening. This member 48
Lead wires led out from the strain gauges 42, 42 and strain gauges 44, 4 are connected to each terminal of the strain gauges 44, 4.
A lead wire led out from 4 through a conduction pipe 50 is connected.
このロードセルは、直方体状の弾性体１０にス
リツト２６を設けて両持起歪弾性体梁２８を形成
し、この梁２８にその両端面３８，４０から歪検
出応力集中孔３２，３４を穿設し、これらにスト
レインゲージ４２，４２，４４，４４を貼着した
構成であるから、単にダイヤフラム４６やハーメ
チツカリ端子部材４８のような開口封止部材を歪
検出応力集中孔３２，３４に固着するだけで完全
気密の構成にできる。従つて第１図及び第２図に
示した従来のものには必要であつたケーシングが
不要であるから、製作が容易である。さらにダイ
ヤフラム４６やハーメチツカリ端子部材４８のよ
うな開口封止部材の両持起歪弾性体梁２８の両端
面に開口する歪検出応力集中孔３２，３４の開口
端縁に固着するので、その封止部材の位置は応力
影響のきわめて少ない位置であり、封止部材の剛
性や取付条件がストレインゲージ貼付部へ及ぼす
影響が殆どないから、ロードセル出力特性が安定
する。また弾性体１０が直方体状で一体構造であ
るので、荷重の支持点と着力点とを同一直線上に
位置させられ、ヒステリシス特性を改善でき、ロ
ードセル出力特性が安定になる。 This load cell has a rectangular parallelepiped-shaped elastic body 10 provided with a slit 26 to form a double-supported strain elastic beam 28, and strain detection stress concentration holes 32, 34 are bored in this beam 28 from both end faces 38, 40. However, since the strain gauges 42, 42, 44, and 44 are attached to these, opening sealing members such as the diaphragm 46 and the hermetic terminal member 48 are simply fixed to the strain detection stress concentration holes 32 and 34. This allows for a completely airtight configuration. Therefore, since the casing required in the conventional ones shown in FIGS. 1 and 2 is not required, manufacturing is easy. Furthermore, since it is fixed to the opening edges of the strain detection stress concentration holes 32 and 34 opened on both end surfaces of the both-supported strain elastic beam 28 of the opening sealing member such as the diaphragm 46 and the hermetic terminal member 48, the sealing The position of the member is at a position where the influence of stress is extremely small, and the stiffness of the sealing member and mounting conditions have almost no effect on the strain gauge attachment portion, so the load cell output characteristics are stable. Furthermore, since the elastic body 10 is rectangular parallelepiped and has an integral structure, the load support point and the force application point can be located on the same straight line, improving hysteresis characteristics and stabilizing the load cell output characteristics.
第１図は従来のロードセルの部分破断平面図、
第２図は従来のロードセルの横断面図、第３図は
この発明によるロードセルの１実施例の平面図、
第４図は同実施例の横断面図、第５図は第３図の
Ａ−Ａ断面図である。
１０……弾性体、１４……着力部、２６……ス
リツト、２８……両持起歪弾性体梁、３０……荷
重支持台、３２，３４……歪検出応力集中孔、４
２，４４……ストレインゲージ。
Figure 1 is a partially cutaway plan view of a conventional load cell.
FIG. 2 is a cross-sectional view of a conventional load cell, and FIG. 3 is a plan view of an embodiment of the load cell according to the present invention.
FIG. 4 is a cross-sectional view of the same embodiment, and FIG. 5 is a cross-sectional view taken along line AA in FIG. 3. DESCRIPTION OF SYMBOLS 10...Elastic body, 14...Forcing part, 26...Slit, 28...Both supported strain elastic body beam, 30...Load support base, 32, 34...Strain detection stress concentration hole, 4
2,44...Strain gauge.
Claims (1)
を設け、上記上面とそれぞれ直角であると共に互
いに対向している面間を貫通させてスリツトを穿
設することにより、上記スリツトから上部を両持
起歪弾性梁とし、上記スリツトから下部を荷重支
持台とし、上記両持起歪弾性梁の軸線方向に沿つ
て外方から所定深さ位置まで穴を穿設することに
よつて比較的薄肉な部分を形成し、上記穴の内面
にストレインゲージを貼着し、上記穴の開口縁を
封止部材で封止してなるロードセル。 ２ 上記ストレインゲージが剪断歪検出型または
曲げ歪検出型である特許請求の範囲第１項記載の
ロードセル。[Scope of Claims] 1. By providing a load applying portion on the upper surface of an elastic body having a substantially rectangular parallelepiped shape, and drilling slits through the surfaces that are perpendicular to the upper surface and facing each other, The upper part from the slit is used as a double-supported strain elastic beam, the lower part from the slit is used as a load support, and a hole is bored from the outside to a predetermined depth position along the axial direction of the double-supported strain elastic beam. A load cell is formed by forming a relatively thin part by forming a hole, a strain gauge is affixed to the inner surface of the hole, and the opening edge of the hole is sealed with a sealing member. 2. The load cell according to claim 1, wherein the strain gauge is of a shear strain detection type or a bending strain detection type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7164981A JPS57186132A (en) | 1981-05-12 | 1981-05-12 | Load cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7164981A JPS57186132A (en) | 1981-05-12 | 1981-05-12 | Load cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57186132A JPS57186132A (en) | 1982-11-16 |
| JPH022524B2 true JPH022524B2 (en) | 1990-01-18 |
Family
ID=13466674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7164981A Granted JPS57186132A (en) | 1981-05-12 | 1981-05-12 | Load cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57186132A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0546408Y2 (en) * | 1988-12-26 | 1993-12-06 | ||
| JPH03119734U (en) * | 1991-02-21 | 1991-12-10 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS519489A (en) * | 1974-07-13 | 1976-01-26 | Kyowa Electronic Instruments | Setakeno hikuikajuhenkanki |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5910592Y2 (en) * | 1976-03-12 | 1984-04-03 | 東芝テック株式会社 | load cell |
-
1981
- 1981-05-12 JP JP7164981A patent/JPS57186132A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS519489A (en) * | 1974-07-13 | 1976-01-26 | Kyowa Electronic Instruments | Setakeno hikuikajuhenkanki |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57186132A (en) | 1982-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4656454A (en) | Piezoresistive pressure transducer with elastomeric seals | |
| US4942383A (en) | Low cost wet-to-wet pressure sensor package | |
| US4423640A (en) | Electromechanical bending force receiver, in particular for weighing cells | |
| US4314225A (en) | Pressure sensor having semiconductor diaphragm | |
| JPS59210338A (en) | Pressure transmitter | |
| JPS5917124A (en) | Pressure compensator for load cell | |
| JP2503290B2 (en) | Semiconductor pressure / differential pressure measurement diaphragm | |
| US6612178B1 (en) | Leadless metal media protected pressure sensor | |
| CN100416274C (en) | Differential piesoelectric two dimension acceleration sensor | |
| JPH022524B2 (en) | ||
| JP6696026B1 (en) | Load cell | |
| JP2769493B2 (en) | Connection structure of strain gage applied transducer | |
| US6286372B1 (en) | Pressure differential measuring transducer | |
| JP3559915B2 (en) | Humidity sensor | |
| JPH0740185Y2 (en) | Moisture-proof structure of strain gauge type transducer | |
| JPH08226861A (en) | Pressure sensor and its mounting structure | |
| JP4157182B2 (en) | Explosion-proof load cell and design method | |
| JPH05209796A (en) | Structure of cylindrical sealed load cell | |
| JPH0336170B2 (en) | ||
| JPH044987Y2 (en) | ||
| JP3285971B2 (en) | Semiconductor pressure sensor | |
| JPS6240441Y2 (en) | ||
| JP2742138B2 (en) | Load cell | |
| JPH0345162Y2 (en) | ||
| JPS635255Y2 (en) |