JPH0350434Y2 - - Google Patents
Info
- Publication number
- JPH0350434Y2 JPH0350434Y2 JP1983076772U JP7677283U JPH0350434Y2 JP H0350434 Y2 JPH0350434 Y2 JP H0350434Y2 JP 1983076772 U JP1983076772 U JP 1983076772U JP 7677283 U JP7677283 U JP 7677283U JP H0350434 Y2 JPH0350434 Y2 JP H0350434Y2
- Authority
- JP
- Japan
- Prior art keywords
- strain gauge
- putty
- waterproof
- strain
- load cell
- 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
- 238000009434 installation Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- 244000043261 Hevea brasiliensis Species 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920003052 natural elastomer Polymers 0.000 description 2
- 229920001194 natural rubber Polymers 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000004447 silicone coating Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Measurement Of Force In General (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案はロードセルに関し、詳しくはロードセ
ルの測定精度を維持した防湿、防水構造の改良に
関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a load cell, and more specifically, to an improvement in a moisture-proof and waterproof structure that maintains the measurement accuracy of a load cell.
（従来技術とその課題）
一般にロードセルは、ロ字形起歪体の上下に離
間した水平梁に薄肉部を形成し、該薄肉部に歪ゲ
ージを配した構造である。(Prior Art and its Problems) Generally, a load cell has a structure in which a thin wall portion is formed on a horizontal beam spaced apart above and below a rectangular strain body, and a strain gauge is arranged in the thin wall portion.
上記歪ゲージは、水分に弱く、湿気雰囲気中で
は歪ゲージに精度が低下したり、耐久性が低下す
る。 The strain gauges described above are sensitive to moisture, and in a humid atmosphere, the strain gauges have reduced accuracy and durability.
しかるに、従来第６図に示す如く起歪体２に歪
ゲージ１を貼付してからシリコンコーテイング
３′を施していたが、シリコンコーテイング３′の
層を厚くしてもコーテイング層にピンホールが出
来たり、組織自体に水蒸気の透過性があつて充分
な防水性が得られなかつた。 However, conventionally, as shown in FIG. 6, the silicon coating 3' was applied after attaching the strain gauge 1 to the strain-generating body 2, but even if the silicon coating 3' was made thicker, pinholes were formed in the coating layer. In addition, the tissue itself was permeable to water vapor, making it impossible to obtain sufficient waterproofness.
上記不具合を解消するため、本出願人はシリコ
ンコーテイングより防水性に優れた天然ゴム、合
成ゴム等からなる防水パテを歪ゲージ配設面上に
被着した防水構造を提案したが（実開昭59−
128540号）、該構造においては防水パテ全面を起
歪体面上に密着させる場合には、歪ゲージを撓ま
せる荷重により、密着した防水パテも一緒に撓む
ことになる。そのため、特にロードセルを低温環
境で使用する場合は、防水パテの硬化を生じ、同
一荷重を長時間かけていると、ロードセルの出力
が変化する（クリープ特性の悪化）ことがあり、
ロードセルの精度上、新たな問題点が発生する。 In order to resolve the above-mentioned problems, the applicant proposed a waterproof structure in which a waterproof putty made of natural rubber, synthetic rubber, etc., which is more waterproof than silicone coating, is coated on the strain gauge installation surface (Jitsukasho 59−
No. 128540), in this structure, when the entire surface of the waterproof putty is brought into close contact with the surface of the flexure element, the load that bends the strain gauge will also bend the waterproof putty that is in close contact with it. Therefore, especially when the load cell is used in a low-temperature environment, the waterproof putty may harden, and if the same load is applied for a long time, the output of the load cell may change (deterioration of creep characteristics).
A new problem arises regarding the accuracy of the load cell.
本考案は斯る従来不具合に鑑みてなされたもの
で、その目的とする処は防水、防湿効果が高いと
ともに精度及びクリープ特性に優れたロードセル
を提供することにある。 The present invention was devised in view of such conventional problems, and its purpose is to provide a load cell that is highly waterproof and moisture-proof, and has excellent accuracy and creep characteristics.
（課題を解決するための手段）
斯る本考案のロードセルは、上記上下水平梁の
歪ゲージの外周を、前記起歪対の両側辺に平行な
一対の側辺パテと該側辺パテを少なくとも起歪体
の両端側で連結する連結パテとにより囲むととも
にその上から防水シートで覆つて歪ゲージと防水
シートとの間に密封された空隙を形成し、前記側
辺パテは薄肉部の側面部に配置し、連結パテは前
記歪ゲージから離間した位置に配置せしめたこと
を特徴とする。(Means for Solving the Problems) In the load cell of the present invention, the outer periphery of the strain gauge of the upper and lower horizontal beams is formed by connecting at least a pair of side putties parallel to both sides of the strain generating pair. A space is formed between the strain gauge and the waterproof sheet by surrounding it with a connecting putty connecting both ends of the strain-generating body and covering it with a waterproof sheet, and the side putty is connected to the side surface of the thin part. , and the connecting putty is located at a position spaced apart from the strain gauge.
而して、上記薄肉部側面における防水パテの貼
着形状は、防水パテを薄肉部の側面形状に略一致
させて貼着する形状、あるいは薄肉部の最薄部に
合わせた略一定高さに貼着する形状である。 Therefore, the shape of the waterproof putty applied to the side surface of the thin-walled portion is such that the waterproof putty is adhered so as to approximately match the side surface shape of the thin-walled portion, or at a substantially constant height that matches the thinnest portion of the thin-walled portion. It has a shape that can be pasted.
（作用）
本考案によれば、防水パテ及び防水シートによ
り歪ゲージ外周に密封された空隙が形成されるの
で、歪ゲージに対し防水防湿作用が得られるとと
もに、歪ゲージの近傍に防水パテがなく、該パテ
の硬化に伴う悪影響を最小限ならしめる。(Function) According to the present invention, a sealed gap is formed around the outer periphery of the strain gauge by the waterproof putty and waterproof sheet, so that the strain gauge is waterproof and moisture-proof, and there is no waterproof putty near the strain gauge. , minimizing the adverse effects associated with hardening of the putty.
とくに薄肉部側面近傍に配した防水パテの形状
により、ロードセルに負荷がかかり薄肉部がたわ
む場合、薄肉部側面の中立軸（薄肉部の暑さ中心
軸線）で最も応力の発生が少ない部分を中心にし
て、防水パテが薄肉部と共にたわむことになり、
薄肉部のたわみを妨げる影響が最も少ない。 In particular, if the shape of the waterproof putty placed near the side of the thin wall places a load on the load cell and the thin wall bends, the center of the neutral axis of the side of the thin wall (center axis of heat of the thin wall) where the least stress occurs. As a result, the waterproof putty will sag along with the thin wall part,
It has the least influence on the deflection of thin-walled parts.
（実施例）
本考案の第１実施例を第１図〜第４図により説
明すれば、図中２は上下に離間した水平梁を有
し、この水平梁の両端部を連結する連結部を備え
たロの字形の起歪体であり、その上下両水平梁に
薄肉部２ａを形成し各薄肉部の上下面に夫々歪ゲ
ージ１を貼付してなる。(Embodiment) The first embodiment of the present invention will be described with reference to FIGS. 1 to 4. In the figure, 2 has horizontal beams spaced apart vertically, and a connecting portion connecting both ends of the horizontal beam. This is a square-shaped strain-generating body, with thin wall portions 2a formed on both the upper and lower horizontal beams, and strain gauges 1 affixed to the upper and lower surfaces of each thin wall portion, respectively.
起歪体２の一側連結部には、上下に貫通する通
孔１２を穿設するとともに、通孔１２に向つて連
結部の側面に取付口１３を開口してコード通路を
形成する。取付口１３には気密ジヨイント１４を
介して入出力用ワイヤである防水コード１１を接
続する。 A through hole 12 passing vertically is formed in one side connecting portion of the strain body 2, and an attachment port 13 is opened on the side surface of the connecting portion toward the through hole 12 to form a cord passage. A waterproof cord 11, which is an input/output wire, is connected to the attachment port 13 via an airtight joint 14.
気密ジヨイント１４は取付口１３と防水コード
１１との隙間を密封するものである。 The airtight joint 14 seals the gap between the attachment port 13 and the waterproof cord 11.
防水コード１１より導線をコード通路を通して
渉し各歪ゲージ１に配線する。 Conductive wires are routed from the waterproof cord 11 through the cord passage to each strain gauge 1.
上記起歪体２には左右両側面の上下各縁部及び
上下各面の短辺側縁部にそれぞれ防水パテ３を貼
着して配設する。 The strain body 2 is provided with waterproof putty 3 adhered to the upper and lower edges of both left and right sides, and to the short side edges of each upper and lower surface.
防水パテー３は歪ゲージ１の周囲、詳しくは起
歪体２の上下各部において歪ゲージ１の外周に垣
状部分を形成するもので、起歪体の側辺に平行な
一対の側辺パテ３ａ，３ａと前記薄肉部２ａに平
行な一対の連結パテ３ｂ，３ｂとからなる。 The waterproof putty 3 forms a hedge around the strain gauge 1, specifically at the upper and lower parts of the strain body 2, and has a pair of side putties 3a parallel to the sides of the strain body 2. , 3a and a pair of connecting putties 3b, 3b parallel to the thin portion 2a.
上記側辺パテ３ａ，３ａは、薄肉部２ａの側面
部、すなわち起歪体２の側面に主として位置する
ようにし、その下縁又は上縁は薄肉部を形成する
切欠孔の孔縁形状と略一致させるようにする。
（第１図，第４図）。 The side putties 3a, 3a are mainly located on the side surface of the thin wall portion 2a, that is, on the side surface of the flexure element 2, and the lower edge or the upper edge thereof is approximately shaped like the edge of the notch hole forming the thin wall portion. Try to match.
(Figures 1 and 4).
又、連結パテ３ｂ，３ｂは前記歪ゲージ１，１
から離間した起歪体の短辺側縁部に位置させる。
尚、この連結パテをさらに歪ゲージ１，１間で両
歪ゲージから離間した位置に配置することもよ
い。 Moreover, the connecting putties 3b, 3b are connected to the strain gauges 1, 1.
It is located on the short side edge of the flexure element, which is spaced from the flexure element.
Note that this connecting putty may be further placed between the strain gauges 1 and 1 at a position spaced apart from both strain gauges.
尚、上記パテ３は第５図に示す如く、薄肉部の
側面部分を薄肉部の最薄部分に略一致する均一高
さとすることもよく、さらに上下各面部に配設す
るパテに代えて起歪体２の前後側面にパテ３を配
設することもよい。 As shown in FIG. 5, the putty 3 may have a uniform height that substantially matches the thinnest part of the thin-walled part on the side surface of the thin-walled part. It is also possible to arrange putty 3 on the front and rear sides of the distortion body 2.
防水パテ３は高分子化合物からなる合成パテ、
又は天然ゴムを主成分とするパテであり、防水防
湿性の粘性体である。 Waterproof putty 3 is a synthetic putty made of a polymer compound.
Alternatively, it is a putty whose main component is natural rubber, and is a waterproof and moisture-proof viscous body.
上記防水パテ３に防水シート４を覆設する。 A waterproof sheet 4 is placed over the waterproof putty 3.
防水シート４は該シート４と歪ゲージ１との間
に空隙を生じさせるもので、水蒸気を通さない金
属箔、ゴムシート及び樹脂シート等で形成する。
本実施例においてはアルミ箔であり、歪ゲージ１
の近傍においては適宜シワを生じさせて起歪体２
の撓みを妨げないようにするとよい。又、歪ゲー
ジ１の上面には絶縁シート６を覆設する。 The waterproof sheet 4 creates a gap between the sheet 4 and the strain gauge 1, and is made of metal foil, rubber sheet, resin sheet, or the like that does not allow water vapor to pass through.
In this example, it is aluminum foil, and the strain gauge 1
In the vicinity of the strain body 2, wrinkles are created as appropriate.
It is advisable not to obstruct the flexure of the Further, the upper surface of the strain gauge 1 is covered with an insulating sheet 6.
防水シート４の覆設位置は前記パテ３の配置位
置に合わせ、第４図のように前後に折り込んでも
よく、第５図のように４辺を折り込んでもよい。 The covering position of the waterproof sheet 4 may be adjusted to the placement position of the putty 3, and may be folded back and forth as shown in FIG. 4, or the four sides may be folded in as shown in FIG.
空隙５は防水シート４、防水パテ３及び起歪体
２に囲まれた閉鎖空間であり、大気の湿気を吸い
込まないものであると共に、歪ゲージ１の荷重に
よる変形が防水シート及び防水パテ等に妨げられ
ないようにするものである。 The void 5 is a closed space surrounded by the waterproof sheet 4, the waterproof putty 3, and the flexure element 2, and does not absorb moisture from the atmosphere. It is meant to be unobstructed.
尚、上記実施例においては、通孔１２の上下各
端を前記防水シート、防水パテ及び起歪体に囲ま
れた閉鎖空間内に開口させ、該通孔１２の取付口
１３を気密ジヨイントにより密封してあるので、
入出力用ワイヤの挿通通路が完全に密封されると
ともに起歪体２の上下各面は歪ゲージ及びそれに
接続する配線部を含めて前記空間内に配置される
ので、歪ゲージ及びその近傍の防湿，防水性はよ
り高い構造となつている。 In the above embodiment, the upper and lower ends of the through hole 12 are opened into a closed space surrounded by the waterproof sheet, waterproof putty, and flexure element, and the mounting opening 13 of the through hole 12 is sealed with an airtight joint. Since it has been done,
The insertion path for the input/output wires is completely sealed, and the upper and lower surfaces of the strain generating body 2, including the strain gauge and the wiring connected to it, are placed in the space, so that the strain gauge and its vicinity are moisture-proof. , The structure is more waterproof.
（効果）
本考案によれば、歪ゲージ外周に密封された空
隙が形成されることにより、防水防湿効果があ
る。(Effects) According to the present invention, a sealed void is formed around the outer periphery of the strain gauge, thereby providing a waterproof and moisture-proof effect.
又、歪ゲージを貼着した薄肉部近傍に防水パテ
が配設された構造であるが、薄肉部がたわむとき
には、薄肉部の中立軸を中心にして防水パテが薄
肉部に追従してたわみ、歪ゲージの特性が防水パ
テの影響で損なわれることを防止でき、ロードセ
ルの測定精度を高精度に維持することができる。 In addition, the structure is such that waterproof putty is placed near the thin-walled part to which the strain gauge is attached, but when the thin-walled part deflects, the waterproof putty follows the thin-walled part and deflects around the neutral axis of the thin-walled part. It is possible to prevent the characteristics of the strain gauge from being impaired by the influence of the waterproof putty, and it is possible to maintain high measurement accuracy of the load cell.
第１図は本考案ロードセルの第１実施例を示す
一部切欠せる正面図、第２図は第１図の−線
断面図、第３図は第１図の−線断面図、第４
図は同立体図、第５図は第２実施例の立体図、第
６図は従来例の立体図である。
図中、１……ストレンゲージ、２……起歪体、
３……防水パテ、４……防水シート、５……空
隙、である。
FIG. 1 is a partially cutaway front view showing the first embodiment of the load cell of the present invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, FIG.
5 is a three-dimensional view of the same, FIG. 5 is a three-dimensional view of the second embodiment, and FIG. 6 is a three-dimensional view of the conventional example. In the figure, 1... strain gauge, 2... strain body,
3... waterproof putty, 4... waterproof sheet, 5... void.
Claims (1)
し、該薄肉部に対応した上下水平梁の歪ゲージ配
設面に歪ゲージを貼着し、この水平梁の両端を連
結する連結部を備えたロ字形起歪体のロードセル
において、上記上下水平梁の歪ゲージの外周を、
前記起歪体の両側辺に平行な一対の側辺パテと該
側辺パテを少なくとも起歪体の両端側で連結する
連結パテとにより囲むとともにその上から防水シ
ートで覆つて歪ゲージと防水シートとの間に密封
された空隙を形成し、前記側辺パテは薄肉部の側
面部に配置し、連結パテは前記歪ゲージから離間
した位置に配置せしめたロードセル。 A thin wall portion is formed in each of the vertically spaced horizontal beams, a strain gauge is attached to the strain gauge installation surface of the upper and lower horizontal beams corresponding to the thin wall portion, and a connecting portion is provided to connect both ends of the horizontal beam. In a load cell with a square-shaped strain body, the outer periphery of the strain gauge of the upper and lower horizontal beams is
The strain gauge is surrounded by a pair of side putties parallel to both sides of the flexure element and a connecting putty that connects the side putties at least at both ends of the flexure element, and is covered with a waterproof sheet over the strain gauge and the waterproof sheet. a load cell, wherein a sealed gap is formed between the load cell and the strain gauge, the side putty is disposed on a side surface of the thin-walled portion, and the connecting putty is disposed at a position spaced apart from the strain gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7677283U JPS59183639U (en) | 1983-05-21 | 1983-05-21 | load cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7677283U JPS59183639U (en) | 1983-05-21 | 1983-05-21 | load cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59183639U JPS59183639U (en) | 1984-12-06 |
| JPH0350434Y2 true JPH0350434Y2 (en) | 1991-10-28 |
Family
ID=30206822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7677283U Granted JPS59183639U (en) | 1983-05-21 | 1983-05-21 | load cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59183639U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH065183B2 (en) * | 1988-06-08 | 1994-01-19 | 株式会社寺岡精工 | Method for manufacturing moisture-proof load cell |
| JP2001343294A (en) * | 2000-05-31 | 2001-12-14 | Ishida Co Ltd | Load cell and balance |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5966127U (en) * | 1982-10-26 | 1984-05-02 | 株式会社石田衡器製作所 | load cell |
-
1983
- 1983-05-21 JP JP7677283U patent/JPS59183639U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59183639U (en) | 1984-12-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FI72601C (en) | ELEKTROMEKANISK BOEJNINGSKRAFTMAETARE, SAERSKILT FOER VAOGCELLER. | |
| CN101765776B (en) | Acceleration sensor | |
| GB2049950A (en) | Load-cell balance | |
| EP0107966B2 (en) | Load cell and method for its manufacture | |
| JPH0350434Y2 (en) | ||
| JPH0230743Y2 (en) | ||
| CN108462910A (en) | Microphone unit | |
| JPS5910592Y2 (en) | load cell | |
| JPS6329202Y2 (en) | ||
| JPH0122351Y2 (en) | ||
| JPS6237149Y2 (en) | ||
| JPS5910593Y2 (en) | load cell | |
| JPH0454425Y2 (en) | ||
| JPS631223Y2 (en) | ||
| JPH0221733B2 (en) | ||
| JPS5817238Y2 (en) | Load cell waterproofing device | |
| JP2575883Y2 (en) | Waterproof structure of exterior case for vehicle | |
| JPH0530111Y2 (en) | ||
| JPH08226861A (en) | Pressure sensor and its mounting structure | |
| JPH0424739Y2 (en) | ||
| JPS59196432A (en) | Humidity preventing structure of load cell | |
| JPH041444Y2 (en) | ||
| JPS625616Y2 (en) | ||
| JP2523896Y2 (en) | Waterproof fire detector and its packing | |
| JPH0621825B2 (en) | Moisture-proof structure of strain gauge type load cell |