JPH0815057A - Thin type load cell - Google Patents
Thin type load cellInfo
- Publication number
- JPH0815057A JPH0815057A JP14729894A JP14729894A JPH0815057A JP H0815057 A JPH0815057 A JP H0815057A JP 14729894 A JP14729894 A JP 14729894A JP 14729894 A JP14729894 A JP 14729894A JP H0815057 A JPH0815057 A JP H0815057A
- Authority
- JP
- Japan
- Prior art keywords
- strain
- load
- groove
- load cell
- pressure receiving
- 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.)
- Granted
Links
Landscapes
- Measurement Of Force In General (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は、車両の輪重や全重量
の計重をはじめとして、厚みの薄さを利用してその他の
台はかり等に1個又は複数個使用して計重機を構成する
ストレインゲージ式薄型ロードセルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weighing machine that uses one or a plurality of other scales such as wheel weight and total weight of a vehicle and other thin scales by utilizing its thinness. The present invention relates to a strain gauge type thin load cell which is configured.
【0002】[0002]
【従来の技術】従来この種のストレインゲージ式の薄型
ロードセルとしては図7、図8に示すものがあった。図
7Aはこのロードセルの外観斜視図で、41は剛性のあ
る外枠、42は矢印の負荷Wを受ける剛性のある受圧
台、43A〜43Dは上記外枠41と受圧台42との間
の四方に配置連結された撓み易い形状の荷重検出部であ
り、これら41〜43は一体構造となっている。又上記
43A〜43Dの検出部にはそれぞれストレインゲージ
44が貼付されている。図7Bは大容量用として採用さ
れた上記検出部でのせん断歪検出構造の図で、一般に長
辺aと短辺bの矩形断面を形成し、一方の面45は外枠
41に、他方の面46は受圧台42につながっており、
上記面45、46の両側面にはストレインゲージ44が
貼付され、矢印の負荷Wによりストレインゲージ44の
貼付された面にせん断歪を発生し、その歪をストレイン
ゲージが検知して電気信号に変換して取り出すようにな
っている。図7Cは図7Aの負荷検出部43A〜43D
に替わって小容量用として採用された曲げ歪検出構造の
図で、一般に短辺C長辺dの矩形断面を形成し、一方の
面55は外枠41に、他方の面56は受圧台42につな
がった負荷検出部53A〜53Dを形成している。この
負荷検出部の上下面は図7Cに示すように、短辺Cの方
向がそれぞれ2ヶ所ずつ厚みが薄くなって57、5
7’、58、58’の面を形成し、ここにストレインゲ
ージ54が4ヶ所貼付され、図7Aの矢印の負荷Wによ
りストレインゲージ54の貼付された面に曲げ歪を発生
し、その歪をストレインゲージが検知して電気信号に変
換して取り出すようになっている。2. Description of the Related Art Conventionally, strain gauge type thin load cells of this type have been shown in FIGS. FIG. 7A is an external perspective view of this load cell, in which 41 is a rigid outer frame, 42 is a rigid pressure receiving base that receives a load W indicated by an arrow, and 43A to 43D are four sides between the outer frame 41 and the pressure receiving base 42. It is a load detecting portion which is arranged and connected in a flexible shape, and these 41 to 43 have an integral structure. A strain gauge 44 is attached to each of the detectors 43A to 43D. FIG. 7B is a diagram of a shear strain detection structure in the above-mentioned detection unit adopted for a large capacity. Generally, a rectangular cross section of a long side a and a short side b is formed, and one surface 45 is formed on the outer frame 41 and the other surface 45 is formed. The surface 46 is connected to the pressure receiving table 42,
Strain gauges 44 are attached to both sides of the surfaces 45 and 46, and a shear strain is generated on the surface of the strain gauge 44 attached by the load W indicated by an arrow, and the strain gauge detects the strain and converts it into an electric signal. And then take it out. FIG. 7C shows the load detection units 43A to 43D of FIG. 7A.
In the figure of the bending strain detecting structure adopted for small capacity instead of the above, generally, a rectangular cross section of the short side C and the long side d is formed, one surface 55 is the outer frame 41, and the other surface 56 is the pressure receiving table 42. To form load detectors 53A to 53D. As shown in FIG. 7C, the upper and lower surfaces of the load detecting portion have two thin portions in the direction of the short sides C, 57 and 57, respectively.
7 ', 58, 58' are formed, and the strain gauges 54 are adhered at four places on the surfaces 7 ', 58, 58', and bending strain is generated on the adhered surfaces of the strain gauge 54 by the load W indicated by an arrow in FIG. The strain gauge detects it, converts it into an electric signal, and takes it out.
【0003】図8は図7AのX−X’断面を示し、実線
は矢印で示す負荷Wがかかる前の状態を表し、点線は負
荷により各部材が歪んだ状態を示している。この図で示
すように、負荷がかかると受圧台42及び荷重検出部4
3A、43Cが点線の如く撓み、受圧台42の長さLは
矢印の横方向に少し縮み、外枠41はその矢印の方向に
引っ張られ、外枠41の底面47と床面48との間に接
触力に応じた滑り及び歪が生じる。FIG. 8 shows a cross section taken along the line XX 'of FIG. 7A, a solid line shows a state before a load W shown by an arrow is applied, and a dotted line shows a state where each member is distorted by the load. As shown in this figure, when a load is applied, the pressure receiving base 42 and the load detecting unit 4
3A and 43C are bent as shown by the dotted lines, the length L of the pressure receiving table 42 is slightly contracted in the lateral direction of the arrow, the outer frame 41 is pulled in the direction of the arrow, and the space between the bottom surface 47 of the outer frame 41 and the floor surface 48 is pulled. Slip and distortion occur depending on the contact force.
【0004】更に従来の技術として、特開昭63−30
734に開示されているようなものがある。この発明は
一つのホルダーに結合された板形状の伸長部材の中央部
を負荷点とし、その中央に対して同心的に延びる一つの
円弧に対して接線的に撓みビームが配置され曲げ歪を検
出し、撓みビームに誤変換を生ぜしめないようにされて
いる。又特開平6−43045、特開平6−43046
に開示されているようなものもある。この発明は上述と
同じように板形状素材を使用し、前後一対の長溝を設け
中央部を荷重受部とし、受圧部と固定部の構造を工夫し
て受感部のフレームの撓みによる固定部の滑りを緩和し
てせん断歪を検出するようにされている。Further, as a conventional technique, JP-A-63-30
734. According to the present invention, a bending beam is arranged tangentially to a circular arc extending concentrically with respect to the center of a plate-shaped extension member connected to one holder, and a bending strain is detected. However, it is designed not to cause erroneous conversion in the deflected beam. Further, JP-A-6-43045 and JP-A-6-43046
There are also those disclosed in. This invention uses a plate-shaped material in the same manner as described above, and provides a pair of front and rear long grooves to make the center part a load receiving part, and devises the structure of the pressure receiving part and the fixing part to fix the receiving part by the bending of the frame. It is designed to alleviate slippage and detect shear strain.
【0005】[0005]
【発明が解決しようとする課題】しかし、図7、図8に
示すものでは外枠41が歪んで床面との接触点の変化及
び滑りが生じてロードセル出力の非直線性及びヒステリ
シス特性が悪くなる。又図7Bに示すせん断歪検出構造
で小容量を実現しようとすれば、重量を検出する検出部
の厚さbを極端に薄くしなければならず、そのために加
工性が悪く、従って加工精度も難しくなり又検出方向に
対する直角方向の機械的強度も弱くなるという問題があ
った。又図7Aで示す外枠の厚みtを薄くしてコンパク
トな小容量型を実現しようとすると、図7Cで示す曲げ
歪検出構造ではストレインゲージを受圧面側とその反対
側に貼付するので、ゲージ表面の絶縁保護膜を接触しな
いようにするために厚みの制限を受ける上、前記のせん
断歪検出構造と同様検出部の剛性を強くできないので機
械加工が非常に難しくなるという問題点があった。更に
特開昭63−30734では荷重点を中心としている
が、荷重点が中心よりはずれたときは片撓みが大きく、
その上荷重による負荷板は上下方向の撓みに加えて僅か
に回転する。又ストレインゲージが上面に貼っているた
め荷重の載せ降ろし時に荷重でゲージを傷つけないよう
に保護が必要となり、そのため厚みが厚くなる等の問題
があり、特開平6−43045及び特開平6−4304
6でも荷重受部に負荷がかかると、検出部から自由端部
を経て固定部へと荷重が伝達されるので、固定部には負
荷方向と同じ下向きの力に加えて若干の曲げ及び捩れの
力が加えられるので、若干の悪影響は避けられず特に小
容量のロードセルはこれらの構造では実用上製作し難い
等の問題点があった。そこでこの発明は、受圧台の撓み
による横方向の撓みを吸収でき、小容量にも対応するた
めにロードセルの厚さを極限にまで薄くしながら機械加
工がしやすい構造としてコンパクトで高精度なロードセ
ルを提供しようとするものである。However, in the case shown in FIGS. 7 and 8, the outer frame 41 is distorted and the contact point with the floor surface changes and slippage occurs, resulting in poor nonlinearity and hysteresis characteristics of the load cell output. Become. Further, in order to realize a small capacity with the shear strain detection structure shown in FIG. 7B, the thickness b of the detection portion for detecting the weight must be extremely thin, which results in poor workability and therefore in processing accuracy. There is a problem that it becomes difficult and the mechanical strength in the direction perpendicular to the detection direction also becomes weak. Further, if it is attempted to reduce the thickness t of the outer frame shown in FIG. 7A to realize a compact small-capacity type, the strain gauge is attached to the pressure receiving surface side and the opposite side in the bending strain detection structure shown in FIG. 7C. There is a problem in that the thickness of the insulating protective film on the surface is limited so that it does not come into contact with the surface, and the rigidity of the detection portion cannot be increased like the shear strain detection structure described above, which makes machining extremely difficult. Further, in JP-A-63-30734, the load point is centered, but when the load point deviates from the center, one-sided deflection is large,
In addition, the load plate due to the load rotates slightly in addition to bending in the vertical direction. Further, since the strain gauge is stuck on the upper surface, it is necessary to protect the gauge from being damaged by the load when loading and unloading the load. Therefore, there is a problem that the thickness becomes thicker, etc., and therefore, JP-A-6-43045 and JP-A-6-4304.
Even in No. 6, when a load is applied to the load receiving portion, the load is transmitted from the detecting portion to the fixed portion via the free end portion. Therefore, in addition to the same downward force as in the load direction, the fixed portion is not slightly bent or twisted. Since a force is applied, some adverse effects are unavoidable, and there is a problem that it is difficult to practically manufacture a load cell having a small capacity with these structures. Therefore, the present invention is capable of absorbing lateral bending due to bending of the pressure receiving table, and is compact and highly accurate as a structure that is easy to machine while the load cell is made as thin as possible in order to accommodate a small capacity. Is to provide.
【0006】[0006]
【課題を解決するための手段】この発明は、方形状又は
円形状の板状の素材で、外側周囲を外枠とし、中央部を
負荷を受ける受圧台とし、上記外枠と受圧台との間に受
圧台を囲むように複数の長溝を貫通して設け、その両端
を幅広の終端溝とし、その二つの終端溝にまたがるよう
にその両側にそれぞれ短溝を設けて薄肉の起歪部とした
荷重検出部を複数設け、上記起歪部の側面には荷重に応
じた捻れ歪を検出して電気出力を発信するストレインゲ
ージを貼付するようにした薄型のロードセルを構成した
ことを特徴とする。なお上記の一つの検出部を構成する
上で、上記短溝を長溝の終端溝をはずれた箇所では幅を
狭くしてもよく、又短溝を終端溝の片側にのみ設けても
よい。更に一検出部の起歪部がH型形状の場合、ストレ
インゲージを上記H型の片側一対のみに貼付してもよ
い。SUMMARY OF THE INVENTION The present invention is a plate-shaped material having a rectangular or circular shape, the outer periphery of which is an outer frame, and the central portion thereof is a pressure receiving base for receiving a load. A plurality of long grooves are provided so as to surround the pressure receiving table in between, and both ends are formed as wide end grooves, and short grooves are provided on both sides so as to straddle the two end grooves, and a thin strain element is formed. A plurality of load detecting units are provided, and a thin load cell is configured such that a strain gauge that detects a twisting strain corresponding to a load and transmits an electric output is attached to a side surface of the strain generating unit. . In configuring the above-mentioned one detection unit, the width of the short groove may be narrowed at a position off the end groove of the long groove, or the short groove may be provided only on one side of the end groove. Further, when the strain generating portion of one detection portion has an H shape, the strain gauge may be attached only to one pair on one side of the H shape.
【0007】[0007]
【作用】図1〜図4にて説明する。これらの図で荷重W
が受圧台2に加えられると、起歪部のつなぎ梁10に受
圧台2が下がる方向の右回りのトルクが発生し、起歪部
8、8’、9、9’の捻れ応力を発生するトルクの反力
とが釣り合って捻れ歪が発生し、図4に示すストレイン
ゲージの結線によって荷重Wに比例した出力電圧が発生
する。この場合、たとえ図3Cに示すように荷重によっ
て受圧台2が曲げられたときでもH型の起歪部を構成す
る左側の起歪部8、8’と、右側の起歪部9、9’とは
それぞれ反対方向に捻れるので、図4Aに示すようにス
トレインゲージのブリッジ内で相殺されて受圧台の曲が
りによる誤差としては表れず、薄型でも小容量から大容
量の高精度なロードセルが実現できる。The operation will be described with reference to FIGS. Load W in these figures
Is applied to the pressure receiving base 2, a clockwise torque in a direction in which the pressure receiving base 2 is lowered is generated in the connecting beam 10 of the strain generating portion, and a twisting stress is generated in the strain generating portions 8, 8 ′, 9, 9 ′. Torsional strain is generated in balance with the reaction force of the torque, and an output voltage proportional to the load W is generated due to the connection of the strain gauge shown in FIG. In this case, even when the pressure receiving base 2 is bent by a load as shown in FIG. 3C, the left strain-flexing portions 8 and 8 ′ and the right strain-flexing portions 9 and 9 ′ that form the H-shaped strain-flexing portion. Since they are twisted in opposite directions, they do not appear in the strain gauge bridge as shown in Fig. 4A and do not appear as an error due to bending of the pressure receiving base. Even with a thin type, a small to large capacity high-precision load cell is realized. it can.
【0008】[0008]
【実施例】この発明の第一と第二の実施例を図1〜図4
に示す。図1A及び図1Bは薄型ロードセルの外観を示
す斜視図で、図1Aは第一実施例を示し、1は方形状を
した外枠で、その内側は中央部に負荷Wを受ける受圧台
2であり、対角の四隅には荷重検出部3を設けて全体を
一体構造として薄型ロードセルを構成している。上記荷
重検出部3は受圧台2の周辺に4本の溝5とその両端の
終端溝6、6’で構成された長溝4を貫通して設け、上
記終端溝6、6’を挟んで短溝7、7’を同様に貫通し
て設けて薄肉部を形成して起歪部としている。従って矢
印で示す負荷Wを受圧台2にかけると四隅の検出部3は
歪を発生し、上記薄肉部に貼付したストレインゲージに
より負荷Wに比例した出力を発生するようになってい
る。図1Bは第二実施例を示し、1は方形状をした外枠
で、2は上記と同様の受圧台であり、第一実施例と異な
るのは3の荷重検出部が受圧台を挟んだ対辺の4箇所に
設置したところである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First and second embodiments of the present invention are shown in FIGS.
Shown in 1A and 1B are perspective views showing the appearance of a thin load cell, FIG. 1A shows a first embodiment, 1 is a rectangular outer frame, and the inside thereof is a pressure receiving table 2 for receiving a load W in the central portion. The load detectors 3 are provided at the four corners of the diagonal, and the whole is integrally structured to form a thin load cell. The load detecting section 3 is provided around the pressure receiving base 2 through a long groove 4 composed of four grooves 5 and end grooves 6 and 6'at both ends of the pressure receiving table 2, and is short with the end grooves 6 and 6'in between. Similarly, the grooves 7 and 7 ′ are provided so as to penetrate therethrough to form a thin-walled portion, which serves as a strain-generating portion. Therefore, when a load W indicated by an arrow is applied to the pressure receiving base 2, the detecting portions 3 at the four corners are distorted and an output proportional to the load W is generated by the strain gauge attached to the thin portion. FIG. 1B shows a second embodiment, 1 is a rectangular outer frame, 2 is a pressure receiving base similar to the above, and the difference from the first embodiment is that 3 load detectors sandwich the pressure receiving base. It has been installed at four locations on the opposite side.
【0009】図2〜図4の詳細については図1Aを対比
して説明するが、図2Aは一つの検出部3を拡大した平
面図、図2Bは図2AのX−X’断面図、図2Cは図2
AのY−Y’断面図である。これらの図において8、
8’は短溝7と長溝4の終端溝6、6’の間に位置する
起歪部で、短辺がb’、長辺がa’の矩形断面で、短辺
b’の水平方向には撓み易く、図1Aの矢印で示す負荷
Wの方向に対しては長辺a’は撓み難い適当な剛性のあ
る形状とされている。同様に9、9’は短溝7’と上記
と同じ終端溝6、6’の間に位置する起歪部であり、上
記の8、8’とは距離d’を隔てて平行に位置し、断面
形状は上記の8、8’と同一となっている。上記終端溝
6と6’の間にはつなぎ梁10があり、8、8’と9、
9’及び10にてH形状となっている。上記起歪部8、
8’、9、9’の側面には捻れ応力検出用ストレインゲ
ージ11、12、13、14、15、16、17、18
が図に示されているようにそれぞれ貼付され、上面を防
湿と絶縁を保護する材料19でコーティングされ、長期
安定するよう処理されている。The details of FIGS. 2 to 4 will be described in comparison with FIG. 1A. FIG. 2A is an enlarged plan view of one detection unit 3, FIG. 2B is a sectional view taken along line XX ′ of FIG. 2A. 2C is Figure 2
It is a YY 'sectional view of A. 8, in these figures
Reference numeral 8'denotes a strain generating portion located between the short groove 7 and the end grooves 6 and 6'of the long groove 4, which is a rectangular cross section with the short side b'and the long side a ', and the horizontal direction of the short side b'. Is easy to bend, and the long side a ′ has a shape with an appropriate rigidity that is hard to bend in the direction of the load W shown by the arrow in FIG. 1A. Similarly, 9 and 9 ′ are strain-flexing parts located between the short groove 7 ′ and the same end grooves 6 and 6 ′ as described above, and are located in parallel with the above 8 and 8 ′ with a distance d ′ therebetween. The cross-sectional shape is the same as the above 8 and 8 '. Between the end grooves 6 and 6 ', there is a connecting beam 10, 8, 8'and 9,
9'and 10 are H-shaped. The strain-flexing part 8,
Strain gauges 11, 12, 13, 14, 15, 16, 17, 18 for detecting torsional stress are provided on the side surfaces of 8 ', 9, 9'.
Are respectively attached as shown in the figure, and the upper surface thereof is coated with a material 19 for protection against moisture and insulation and treated for long-term stability.
【0010】図3Aは図2AのZ−Z’断面で無負荷状
態を示す図で、図3Bは受圧台2に矢印で示す負荷Wが
かかった状態で、検出部3の撓みにより受圧台2がe寸
法の垂直撓みを発生している状態を示す図であり、又図
3Cは同じく負荷状態で受圧台2自身が撓んで曲がり、
上記の検出部3の撓みが加算された状態を示す図であ
る。これらの図において、受圧台2に負荷Wがかかる
と、図2Aに示すつなぎ梁10には図3Bの矢印で示す
方向のトルクT(=W×d’)が発生し、このトルクT
と起歪部8、8’9、9’の捻れ応力τを発生するトル
クの反力TR とが釣り合って捻れ応力τ(=T/4×
K)が求められる。但しKは形状による定数である。又
図3Cで示すように受圧台2が負荷Wによって曲げられ
た場合でも、起歪部8、8’と9、9’とはそれぞれ反
対の矢印の方向に捻れるため、ストレインゲージのブリ
ッジ内で相殺されて出力としては表れず、受圧台2の曲
がりによる誤差は発生しない。又図3Bの受圧台2が図
8の負荷台42のように撓むと点線で示す矢印の方向に
少し縮むが、その量は図2Aで示す起歪部8、8’、
9、9’が水平方向に撓んで殆ど吸収され外枠1に大き
な横荷重がかからず、外枠1と床面との滑りが少なくな
る。ここで上記起歪部の短辺b’が薄すぎると機械加工
時に工具の力で撓んで加工し難く精度も出し難いのでロ
ードセルの容量に応じて距離d’を選択して短辺b’を
加工のしやすい寸法にすることができる。FIG. 3A is a view showing an unloaded state in the ZZ ′ cross section of FIG. 2A, and FIG. 3B is a state in which a load W shown by an arrow is applied to the pressure receiving base 2 and the pressure receiving base 2 is bent due to the deflection of the detecting portion 3. Is a diagram showing a state in which vertical deflection of dimension e is occurring, and FIG. 3C also shows that the pressure receiving table 2 itself bends and bends under a load condition,
It is a figure which shows the state where the bending of the said detection part 3 was added. In these figures, when a load W is applied to the pressure receiving base 2, a torque T (= W × d ′) in the direction indicated by the arrow in FIG. 3B is generated on the connecting beam 10 shown in FIG. 2A, and this torque T
And the reaction force TR of the torque generating the twisting stress τ of the strain-flexing portions 8, 8′9, 9 ′ are balanced and the twisting stress τ (= T / 4 ×
K) is required. However, K is a constant depending on the shape. Further, as shown in FIG. 3C, even when the pressure receiving base 2 is bent by the load W, the strain-flexing portions 8, 8'and 9, 9'are twisted in the opposite directions, so that the strain gauge bridge Are canceled out and do not appear as an output, and an error due to the bending of the pressure receiving table 2 does not occur. Further, when the pressure receiving base 2 in FIG. 3B is bent like the load base 42 in FIG. 8, the pressure receiving base 2 contracts slightly in the direction of the arrow indicated by the dotted line, but the amount thereof is the strain-flexing portions 8, 8 ′ shown in FIG. 2A.
Since 9 and 9'are bent in the horizontal direction and almost absorbed, a large lateral load is not applied to the outer frame 1, and slippage between the outer frame 1 and the floor surface is reduced. If the short side b'of the strain-flexing portion is too thin, the force of the tool bends during machining, which makes it difficult to perform processing and it is difficult to obtain accuracy. Therefore, the distance d'is selected according to the capacity of the load cell and the short side b'is selected. The size can be easily processed.
【0011】図4Aは図2Aで示すように一つの検出部
3において捻れ応力検出用のストレインゲージ11〜1
8の8枚を全て貼付してブリッジ状に結線した図であ
り、kをゲージファクタ、Gを起歪部の横弾性係数、e
i をブリッジ入力電圧とすると負荷Wに比例する歪に対
応する電気出力e0 はe0 =k×τ×ei /2Gとな
り、上記e0 から負荷Wが求められる。図4Bはブリッ
ジ回路のストレインゲージ枚数を少なくしてコストを下
げるため、それぞれ11、13、16、18又は()内
で示す12、14、15、17の4枚で構成した図であ
り上記の8枚構成と同様の効果が得られる。又図3Bに
示すように受圧台2の曲がり歪が少ない場合又は図3C
で示すように受圧台2の曲がり歪があってもその誤差を
許容する場合は、ストレインゲージをそれぞれ11、1
2、13、14又は15、16、17、18の4枚構成
としてもよい。図4Cは図1A、図1Bに示すように検
出部3が4ヶ所のときのブリッジ回路の結線図である。
但しストレインゲージの記載は省略している。As shown in FIG. 2A, FIG. 4A shows strain gauges 11 to 1 for detecting a torsional stress in one detector 3.
8 is a diagram in which all eight sheets of No. 8 are attached and connected in a bridge shape, where k is a gauge factor, G is a lateral elastic modulus of a strain-flexing portion, and e
When i is the bridge input voltage, the electric output e0 corresponding to the distortion proportional to the load W is e0 = k * [tau] * ei / 2G, and the load W can be obtained from the above e0. FIG. 4B is a diagram in which the number of strain gauges of the bridge circuit is reduced and the cost is reduced, so that the number of strain gauges is 11, 13, 16, 18 or four of 12, 14, 15, 17 shown in parentheses, respectively. The same effect as the eight-sheet configuration is obtained. Also, as shown in FIG. 3B, when the pressure receiving base 2 has a small bending strain, or
Even if there is a bending strain of the pressure receiving table 2 as shown in, if the error is tolerable, set the strain gauges to 11, 1 respectively.
It is also possible to have a four-sheet configuration of 2, 13, 14 or 15, 16, 17, 18. FIG. 4C is a connection diagram of a bridge circuit when the number of detection units 3 is four as shown in FIGS. 1A and 1B.
However, the description of the strain gauge is omitted.
【0012】図5はこの発明の第三実施例を示し、外枠
21と受圧台22の対辺の2ヶ所に細長い検出部23を
形成し、ストレインゲージの枚数も検出部数の半減に応
じて半減するようになっているが機能は第一及び第二実
施例と同様である。更にこの発明の第四の実施例を図6
に示す。この実施例は前述の実施例における方形状の外
枠を円形の外枠31とし、受圧台32、検出部33を第
三の実施例と同様2ヶ所としているが、ストレインゲー
ジ枚数を更に半減したもので機能は前述の各実施例と同
様である。FIG. 5 shows a third embodiment of the present invention, in which elongated detectors 23 are formed at two locations on opposite sides of the outer frame 21 and the pressure receiving base 22, and the number of strain gauges is also halved according to the number of detectors halved. The function is similar to that of the first and second embodiments. Furthermore, a fourth embodiment of the present invention is shown in FIG.
Shown in In this embodiment, the rectangular outer frame in the previous embodiment is a circular outer frame 31, and the pressure receiving table 32 and the detecting portion 33 are provided in two places as in the third embodiment, but the number of strain gauges is further halved. The function is the same as that of each of the above-described embodiments.
【0013】[0013]
【発明の効果】検出部の形状をH型形状にして受圧台の
撓み伸縮等の寸法変化を上記H型の起歪部で吸収緩和し
て外枠の固定部にかかる有害な曲げ・引っ張りの力を緩
和して捻れ歪を検出するように構成されているので、中
小容量のロードセルの厚みを極端に薄くでき、しかも加
工性もよく且つストレインゲージの絶縁処理がしやすい
ので、コンパクトで高精度な薄型ロードセルが実現でき
る効果がある。EFFECT OF THE INVENTION By making the shape of the detecting portion H-shaped, the dimensional change such as bending expansion and contraction of the pressure receiving table is absorbed and alleviated by the strain-generating portion of the H-shaped portion, and harmful bending and pulling on the fixed portion of the outer frame is prevented. It is configured to relieve force and detect torsional strain, so the thickness of small and medium capacity load cells can be made extremely thin, and the workability is good and the strain gauge can be easily insulated, so it is compact and highly accurate. There is an effect that can realize a thin load cell.
【図1】この発明の第一の実施例になる外観斜視図A及
び第二の実施例になる外観斜視図Bである。FIG. 1 is an external perspective view A according to a first embodiment of the present invention and an external perspective view B according to a second embodiment of the present invention.
【図2】この発明の第一、第二実施例における検出部の
拡大平面図A、X−X’断面図B及びY−Y’断面図C
である。FIG. 2 is an enlarged plan view A, XX ′ cross-sectional view B and YY ′ cross-sectional view C of the detecting portion in the first and second embodiments of the present invention.
Is.
【図3】図2AのZ−Z’断面で無負荷状態を示す図
A、負荷により受圧台が垂直撓みを発生した状態を示す
図B及び負荷により受圧台自身が撓んで曲がった状態を
示す図Cである。3A shows an unloaded state in the ZZ ′ cross section of FIG. 2A, FIG. 3B shows a state in which the pressure receiving base vertically bends due to a load, and FIG. 3B shows a state in which the pressure receiving base itself bends and bends due to a load. FIG.
【図4】図2Aで示す一つの検出部において起歪部の側
面に全てストレインゲージを貼付したときの結線図A、
H型起歪部の片側起歪部のみにストレインゲージを貼付
してゲージ枚数を半減したときの結線図B及び検出部が
4ヶ所のときの結線図Cである。FIG. 4 is a connection diagram A in which strain gauges are all attached to the side faces of the strain-flexing part in one detection part shown in FIG. 2A,
FIG. 8 is a connection diagram B when a strain gauge is attached only to one side strain portion of the H-shaped strain portion to reduce the number of gauges by half, and a connection diagram C when there are four detection portions.
【図5】この発明の第三の実施例になる外観斜視図であ
る。FIG. 5 is an external perspective view of a third embodiment of the present invention.
【図6】この発明の第四の実施例になる外観斜視図であ
る。FIG. 6 is an external perspective view showing a fourth embodiment of the present invention.
【図7】従来のロードセル外観斜視図A、大容量用とし
たせん断歪検出構造の図B及び小容量用の曲げ歪検出構
造の図Cである。7A is a perspective view of a conventional load cell, FIG. 7B is a shear strain detection structure for large capacity, and FIG. C is a bending strain detection structure for small capacity.
【図8】従来のロードセル図7AのX−X’断面図で負
荷Wがかかったときの歪状態を表した図である。FIG. 8 is a diagram showing a strained state when a load W is applied in a cross-sectional view taken along the line XX ′ of the conventional load cell in FIG. 7A.
1、21、31、41 外枠 2、22、32、42 受圧台 3、23、33、43A〜43D、53A〜53D 荷
重検出部 4 長溝 5 溝 6、6’ 終端溝 7、7’ 短溝 8、8’、9、9’ 起歪部 10 つなぎ梁 11、12、13、14、15、16、17、18、4
4、54 ストレインゲージ 19 絶縁保護材料1, 21, 31, 41 Outer frame 2, 22, 32, 42 Pressure receiving table 3, 23, 33, 43A to 43D, 53A to 53D Load detecting section 4 Long groove 5 Groove 6, 6'End groove 7, 7'Short groove 8, 8 ', 9, 9'Strain element 10 Connecting beam 11, 12, 13, 14, 15, 16, 17, 18, 4
4,54 Strain gauge 19 Insulation protection material
Claims (5)
中央部に位置して負荷を受ける受圧台と、上記外枠と受
圧台との間に受圧台を囲むように溝とその両端に上記溝
より幅広の終端溝を貫通して設けた複数の長溝と、上記
終端溝の二つにまたがるように両側に設けた複数の短溝
とにより形成された薄肉の起歪部からなる複数の荷重検
出部と、上記起歪部の終端溝と短溝との側面にそれぞれ
貼付され、荷重に応じた電気出力を発信するストレイン
ゲージからなることを特徴とする薄型ロードセル。1. A rectangular or circular plate-shaped outer frame,
A pressure receiving base located in the central portion and receiving a load, and a plurality of long grooves formed between the outer frame and the pressure receiving base so as to surround the pressure receiving base and a terminal groove wider at both ends than the groove. And a plurality of load detectors each including a thin strain element formed by a plurality of short grooves provided on both sides so as to extend over two of the end grooves, and an end groove and a short groove of the strain element. A thin load cell, which is composed of strain gauges that are attached to the side surfaces of each and that emits an electrical output according to the load.
歪部が長溝の終端溝と短溝とによりH字形を形成したこ
とを特徴とする薄型ロードセル。2. The thin load cell according to claim 1, wherein the strain generating portions of the plurality of load detecting portions form an H shape by the end groove of the long groove and the short groove.
広とし、この両端の幅広部が長溝の終端溝の両側となる
ように起歪部を形成し、複数の荷重検出部としたことを
特徴とする薄型ロードセル。3. The plurality of short grooves according to claim 1 have wide ends at both ends, and the strain generating portions are formed so that the wide portions at both ends are on both sides of the end groove of the long groove to form a plurality of load detecting portions. A thin load cell featuring.
端溝の片側のみに設けて起歪部を形成し、複数の荷重検
出部としたことを特徴とする薄型ロードセル。4. A thin load cell, wherein a plurality of short grooves according to claim 1 are provided only on one side of an end groove of a long groove to form a strain generating portion, and a plurality of load detecting portions are provided.
を捻れ歪を検出するようにしたことを特徴とする薄型ロ
ードセル。5. A thin load cell, characterized in that the strain gauge according to any one of claims 1 to 4 is adapted to detect torsional strain.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14729894A JP3586696B2 (en) | 1994-06-29 | 1994-06-29 | Thin load cell |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14729894A JP3586696B2 (en) | 1994-06-29 | 1994-06-29 | Thin load cell |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0815057A true JPH0815057A (en) | 1996-01-19 |
JP3586696B2 JP3586696B2 (en) | 2004-11-10 |
Family
ID=15427043
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14729894A Expired - Fee Related JP3586696B2 (en) | 1994-06-29 | 1994-06-29 | Thin load cell |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3586696B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7677113B2 (en) | 2005-06-03 | 2010-03-16 | Sartorius Ag | Weighing system with plural weighing cells |
WO2011081262A1 (en) * | 2009-12-31 | 2011-07-07 | Park Heungjoon | Force-measuring transducer using an electromagnetic induction phenomenon |
CN106124111A (en) * | 2016-08-19 | 2016-11-16 | 国网河南省电力公司电力科学研究院 | Transformer high-voltage bushing end Cornu Caprae seu Ovis type gold utensil static tensile force measures system and method |
-
1994
- 1994-06-29 JP JP14729894A patent/JP3586696B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7677113B2 (en) | 2005-06-03 | 2010-03-16 | Sartorius Ag | Weighing system with plural weighing cells |
WO2011081262A1 (en) * | 2009-12-31 | 2011-07-07 | Park Heungjoon | Force-measuring transducer using an electromagnetic induction phenomenon |
CN106124111A (en) * | 2016-08-19 | 2016-11-16 | 国网河南省电力公司电力科学研究院 | Transformer high-voltage bushing end Cornu Caprae seu Ovis type gold utensil static tensile force measures system and method |
Also Published As
Publication number | Publication date |
---|---|
JP3586696B2 (en) | 2004-11-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7823456B2 (en) | Pressure sensor | |
US6225576B1 (en) | Shear beam load cell | |
CN117607489B (en) | Sensitive structure of piezoresistive acceleration sensor and acceleration sensor | |
JPH0772026A (en) | Strain generating construction and multiaxis force detection sensor using the same | |
JP2732287B2 (en) | Acceleration sensor | |
JPH0815057A (en) | Thin type load cell | |
JP4514547B2 (en) | Load cell | |
JP3184839B2 (en) | Disc shape transducer for weighing system | |
JPH032824Y2 (en) | ||
JPH09269258A (en) | Load cell | |
JPH03249530A (en) | Distribution type tactile sensor | |
JP2753483B2 (en) | Load transducer for detecting vertical force acting on road surface of automobile | |
JP6364637B2 (en) | Load transducer | |
JPH0582805A (en) | Pressure detecting chip of semiconductor pressure detector | |
JPS62211526A (en) | Mechanism for receiving force or pressure having split leaf spring so that bending moment is not generated | |
JPS6119928B2 (en) | ||
JP3060259B2 (en) | 3 component force meter | |
JP2001153735A (en) | Load cell | |
JPS61213645A (en) | Load detector | |
JPS6330734A (en) | Mechanical and electrical converter | |
JP2604692B2 (en) | 2 component force / 1 moment detector | |
JP3553664B2 (en) | Load cell | |
JP2786747B2 (en) | Semiconductor vibration / acceleration sensor | |
JPS63200029A (en) | Thin-type load cell | |
JPH0413940A (en) | Micro capacity type power-electricity quantity converter |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20031224 |
|
A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20040219 |
|
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Effective date: 20040427 Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
R155 | Notification before disposition of declining of application |
Free format text: JAPANESE INTERMEDIATE CODE: R155 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20040712 |
|
R150 | Certificate of patent (=grant) or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
LAPS | Cancellation because of no payment of annual fees |