JPH0260135B2 - - Google Patents
Info
- Publication number
- JPH0260135B2 JPH0260135B2 JP23098783A JP23098783A JPH0260135B2 JP H0260135 B2 JPH0260135 B2 JP H0260135B2 JP 23098783 A JP23098783 A JP 23098783A JP 23098783 A JP23098783 A JP 23098783A JP H0260135 B2 JPH0260135 B2 JP H0260135B2
- Authority
- JP
- Japan
- Prior art keywords
- load cell
- main body
- face
- cylindrical cover
- cell main
- 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
- 210000004027 cell Anatomy 0.000 claims description 32
- 210000005056 cell body Anatomy 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000002265 prevention Effects 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
- G01L1/26—Auxiliary measures taken, or devices used, in connection with the measurement of force, e.g. for preventing influence of transverse components of force, for preventing overload
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Force In General (AREA)
Description
【発明の詳細な説明】
本発明は耐圧防爆機能を有するロードセルの製
造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a load cell having a pressure-resistant and explosion-proof function.
爆発性ガス（たとえばアセトン、石炭ガス、水
素など）を取扱う設備に用いられるロードセル
は、そのストレンゲージの発熱や短絡事故等によ
つて爆発性ガスが爆発しても、その爆発エネルギ
ーがロードセル内にとどめられ、またロードセル
外に火炎逸走が生じないよう耐圧防爆構造とする
ことが義務づけられている。たとえば従来、耐圧
防爆機能を有するロードセルの例として第１図に
示すものがある。１は基端が固定台２にボルト３
止めされたロードセル本体であつて、先端は着力
部Ａとされている。４はロードセル本体１の中央
部適所に形成されたストレンゲージ貼着部であつ
て、ロードセル本体１を削つて四角柱状に形成さ
れると共にその中央に互いに連通する３つの貫通
穴５を穿設されたロバーバル機構６と、該ロバー
バル機構６の上面と下面の薄肉部７に貼着された
ストレンゲージ８とから構成されている。９はス
トレンゲージ貼着部４を覆うベローズである。 Load cells used in equipment that handle explosive gases (e.g. acetone, coal gas, hydrogen, etc.) do not allow the explosion energy to be absorbed into the load cell even if the explosive gas explodes due to heat generation or a short circuit accident in the strain gauge. It is also required to have a flameproof and explosion-proof structure to prevent flames from escaping outside the load cell. For example, there is a conventional load cell shown in FIG. 1 as an example of a load cell having a pressure-resistant and explosion-proof function. 1 has the base end attached to the fixed base 2 with bolt 3
It is a stopped load cell main body, and the tip is made into a force application part A. Reference numeral 4 denotes a strain gauge attachment part formed at a suitable location in the center of the load cell body 1, which is formed by cutting the load cell body 1 into a rectangular prism shape, and has three through holes 5 in the center thereof that communicate with each other. It consists of a Roberval mechanism 6 and strain gauges 8 attached to thin-walled portions 7 on the upper and lower surfaces of the Roberval mechanism 6. 9 is a bellows that covers the strain gauge attachment part 4.
上記構成において、ベローズ９はストレンゲー
ジ貼着部４に塵が付着しないようにするために用
いられており、もしもこのベローズ９に耐圧防爆
機能を持たせるべく、その肉厚を大きくして強度
を持たせると剛性が大きくなり過ぎて着力部Ａに
加わつた荷重Ｐの計量を正確におこなうことが困
難となる。特に、小秤量のロードセルにおいては
計量精度を高めると、耐圧防爆構造が得にくいの
が現状である。 In the above configuration, the bellows 9 is used to prevent dust from adhering to the strain gauge attachment part 4. If the bellows 9 is to have a pressure-resistant and explosion-proof function, its thickness may be increased to increase its strength. If it is held, the rigidity becomes too large and it becomes difficult to accurately measure the load P applied to the force application part A. In particular, it is currently difficult to obtain a pressure-resistant and explosion-proof structure when measuring accuracy is increased in a load cell with a small weighing capacity.
耐圧防爆構造でしかも小秤量でも使用できるも
のとして第２図のような新規な構造のロードセル
が考えられる。１０はロードセル本体で、その基
端部は固定台１１にボルト１２止めされている。
１３はロードセル本体１０の中央適所に形成され
たストレンゲージ貼着部であつて、ロードセル本
体１０を削つて四角柱状に形成されると共にその
中央に互いに連通する３つの貫通穴１４を穿設さ
れたロバーバル機構１５と、該ロバーバル機構１
５の上面と下面の薄肉部１６に貼着されたストレ
ンゲージ１７とから構成されている。１８はロー
ドセル本体１０に外嵌する円筒状カバーであつ
て、ボルト１９によりロードセル本体１０に固定
されている。２０はロードセル本体１０に外嵌す
ると共にカバー１８に所定の間隙α1をおいて接近
させられかつロードセル本体１０に溶接（または
ボルト止めでもよい）させられたリング状対向部
材である。なお、間隙α1の幅W1と奥行L1は耐圧
防爆を満足するように次のように設定されてい
る。すなわち、産業安全研究所技術指針（産業安
全研究所報告、RIIS−TR−79−１、昭和54年11
月15日発刊、著者労働省産業安全研究所）の
「3231接合面」に基づいてカバー１８内のロード
セル本体を除く空間２１が「２cm3を越え100cm3以
下」の場合には奥行L1を10mm以上とし、幅W1を
0.1mm（爆発等級２の場合）以下としてある。ま
た、ロードセル本体１０とカバー１８との間から
火炎逸走が生じないようカバー１８の段部２２か
らボルト１９の貫通穴との間の間隙L2を６mm以
上に設定してある。また、２３はゴム製防塵カバ
ー、２４は計量受台であつて、ボルト２５および
ナツト２６を介してロードセル本体１０の先端に
連結されている。２７はストレンゲージ接続コー
ドの挿通用貫通穴、２８はストレンゲージ接続コ
ードを覆う耐圧防爆端子箱である。 A load cell with a novel structure as shown in FIG. 2 can be considered as a load cell with a pressure-resistant and explosion-proof structure that can be used even with a small weight. Reference numeral 10 denotes a load cell main body, the base end of which is fixed to a fixing base 11 with bolts 12.
Reference numeral 13 denotes a strain gauge attachment part formed at a proper central location of the load cell body 10, which is formed into a square column shape by cutting the load cell body 10, and three through holes 14 that communicate with each other are bored in the center thereof. Roberval mechanism 15 and Roberval mechanism 1
The strain gauge 17 is affixed to a thin wall portion 16 on the upper and lower surfaces of the strain gauge 5. Reference numeral 18 denotes a cylindrical cover that fits onto the load cell main body 10 and is fixed to the load cell main body 10 with bolts 19. Reference numeral 20 denotes a ring-shaped opposing member that is fitted onto the load cell main body 10, is brought close to the cover 18 with a predetermined gap α1 , and is welded (or bolted) to the load cell main body 10. Note that the width W 1 and depth L 1 of the gap α 1 are set as follows to satisfy explosion-proof conditions. In other words, the Technical Guidelines of the Institute of Industrial Safety (Report of the Institute of Industrial Safety, RIIS-TR-79-1, November 1978)
Based on "3231 Joint Surface" published by the Ministry of Labor, Industrial Safety Research Institute (author: Ministry of Labor, Industrial Safety Research Institute), if the space 21 inside the cover 18 excluding the load cell body is "more than 2 cm 3 and less than 100 cm 3 ", the depth L 1 should be set to 10 mm. or more, and the width W 1 is
0.1mm (for explosion class 2) or less. Further, the gap L 2 between the stepped portion 22 of the cover 18 and the through hole of the bolt 19 is set to 6 mm or more so that flame escape does not occur between the load cell body 10 and the cover 18. Further, 23 is a rubber dustproof cover, and 24 is a weighing pedestal, which is connected to the tip of the load cell main body 10 via a bolt 25 and a nut 26. 27 is a through hole for inserting the strain gauge connection cord, and 28 is a pressure-resistant and explosion-proof terminal box that covers the strain gauge connection cord.
しかし、第２図のような構成のロードセルの製
造に際し、リング状対向部材２０が取付けられた
ロードセル本体１０に、ロードセル本体１０の基
端部側から所定の形成に仕上げられたカバー１８
を外嵌させて、前記幅W1の間隙となるようにボ
ルト１９止めする作業は信頼性が悪く、また歩留
りの悪いものである。 However, when manufacturing a load cell having the configuration as shown in FIG.
The work of fitting the bolts onto the outside and fixing them with the bolts 19 so that there is a gap of the width W1 is unreliable and has a low yield.
本発明は歩留りが良く、しかも高信頼性で微少
の幅W1の間隙α1を作ることができる耐圧防爆ロ
ードセルの製造方法を提供することを目的とす
る。 An object of the present invention is to provide a method for manufacturing a pressure-resistant and explosion-proof load cell that can produce a gap α 1 with a small width W 1 with high yield and high reliability.
本発明の耐圧防爆ロードセルの製造方法は、仕
上り形状よりも長い筒状カバーでロードセル本体
のストレンゲージ貼着部を覆うと共にその基端部
を前記ロードセル本体の基端部に固定し、ロード
セル本体の着力部側に位置する前記筒状カバーの
端面をロードセル本体の着力部端面よりも必要間
隙の幅Ｗだけ短く切削し、切削された筒状カバー
の前記端面と対向して必要間隙の奥行Ｌを形成す
る対向部材をロードセル本体の着力部端面に固定
して、筒状カバーと対向部材との間に幅がＷで奥
行がＬの火炎逸走防止用の間隙を形成することを
特徴とする。 The method for manufacturing a pressure-resistant and explosion-proof load cell of the present invention covers the strain gauge attachment part of the load cell body with a cylindrical cover that is longer than the finished shape, and fixes its base end to the base end of the load cell body. Cut the end face of the cylindrical cover located on the force application part side to be shorter than the end face of the force application part of the load cell body by the width W of the required gap, and face the end face of the cut cylindrical cover to form the depth L of the required gap. The opposing member to be formed is fixed to the end face of the force application part of the load cell main body, and a gap having a width W and a depth L for preventing flame escape is formed between the cylindrical cover and the opposing member.
以下、本発明の製造方法を第３図と第４図の具
体的な実施例に基づいて説明する。 Hereinafter, the manufacturing method of the present invention will be explained based on specific examples shown in FIGS. 3 and 4.
製造工程は、先ず第３図のようにロードセル本
体１０にカバー１８をボルト１９によつて固定し
て第３図に仮想線で示すようにカバー１８の着力
点側端部２９とロードセル本体１０の着力点側端
面３０とを精密フライス盤などで面一に切削し、
次にカバー１８の端面２９だけを更に寸法Ｗだけ
短かく切削される。この切削工程が終了すると、
第４図に示すようにロードセル本体１０の端面３
０に前記カバー１８の端面２９と長さＬ以上にわ
たつて対向する円盤状対向部材３１をボルト３２
によつて固定して幅Ｗ、奥行Ｌの間隙αが形成さ
れている。３３は対向部材３１にボルト３４によ
つて固定された着力部材で、ここでは第２図にお
けるボルト２５を挿通するための貫通孔３５が穿
設されている。 In the manufacturing process, first, as shown in FIG. 3, the cover 18 is fixed to the load cell body 10 with bolts 19, and as shown by the imaginary line in FIG. Cut the end face 30 on the force-applying point side flush with the end face 30 using a precision milling machine or the like,
Next, only the end face 29 of the cover 18 is further cut short by the dimension W. Once this cutting process is finished,
As shown in FIG. 4, the end surface 3 of the load cell body 10
0, a disc-shaped opposing member 31 that faces the end surface 29 of the cover 18 over a length L or more is attached to the bolt 32.
A gap α having a width W and a depth L is formed by fixing the gap α. Reference numeral 33 denotes a force-applying member fixed to the facing member 31 with a bolt 34, in which a through hole 35 for inserting the bolt 25 shown in FIG. 2 is bored.
このように火炎逸走防止用の間隙α1をＷ≦W1、
Ｌ≧L1にして第３図、第４図のように切削工程
を基本に作製するため、カバー１８のロードセル
本体１０への固定の際にカバー１８とロードセル
本体１０との相対位置を調節する製造方法に比べ
て作業性が良好で、また間隙α1の信頼性も向上す
る。 In this way, the gap α 1 for preventing flame escape is set such that W≦W 1 ,
In order to set L≧L 1 and manufacture it based on the cutting process as shown in FIGS. 3 and 4, the relative position between the cover 18 and the load cell body 10 is adjusted when fixing the cover 18 to the load cell body 10. Compared to the manufacturing method, the workability is better and the reliability of the gap α1 is also improved.
以上説明のように本発明の耐圧防爆ロードセル
の製造方法によると、ロードセル本体に筒状カバ
ーを固定した後にこの筒状カバーの着力点側の端
面をロードセル本体の着力点側端部よりも必要間
隙の幅Ｗだけ短く切削し、ロードセル本体の着力
側端部に対向部材を固定して、この対向部材と筒
状カバーの着力側端部との間に火炎逸走防止用に
必要な幅Ｗ、奥行Ｌの間隙を形成するため、ロー
ドセル本体への筒状カバー取付時にロードセル本
体と筒状カバーとの相対位置を調節して間隙の幅
Ｗを決定する製造方法に比べて容易にしかも高信
頼性の火炎逸走防止用の間隙を高い歩留りで得る
ことができるものである。 As explained above, according to the method for manufacturing a pressure-resistant and explosion-proof load cell of the present invention, after fixing the cylindrical cover to the load cell main body, the end surface of the cylindrical cover on the force application point side is spaced apart from the end of the load cell main body on the force application point side. A facing member is fixed to the force-applying side end of the load cell body, and a width W and depth necessary to prevent flame escape are established between this opposing member and the force-applying side end of the cylindrical cover. In order to form a gap L, this manufacturing method is easier and more reliable than the manufacturing method in which the width W of the gap is determined by adjusting the relative position between the load cell body and the cylindrical cover when attaching the cylindrical cover to the load cell body. A gap for preventing flame escape can be obtained with a high yield.
第１図は従来のベンデイング形ロードセルの一
部切欠き正面図、第２図は耐圧防爆ロードセルの
一部切欠き正面図、第３図と第４図は本発明の具
体的な一実施例の製造過程のロードセル要部詳細
図である。
１０……ロードセル本体、１１……固定台、１
８……筒状カバー、１９……ボルト、２９……筒
状カバーの着力側端面、３０……ロードセル本体
の着力側端面、３１……対向部材、３３……着力
部材、α……火炎逸走防止用間隙。
FIG. 1 is a partially cutaway front view of a conventional bending type load cell, FIG. 2 is a partially cutaway front view of a flameproof explosion-proof load cell, and FIGS. 3 and 4 are of a specific embodiment of the present invention. It is a detailed diagram of the main part of the load cell in the manufacturing process. 10...Load cell body, 11...Fixing stand, 1
8... Cylindrical cover, 19... Bolt, 29... End face on the force application side of the cylindrical cover, 30... End face on the force application side of the load cell body, 31... Opposing member, 33... Force application member, α... Flame escape Prevention gap.
Claims (1)
ル本体のストレインゲージ貼着部を覆うと共にそ
の基端部を前記ロードセル本体の基端部に固定
し、ロードセル本体の着力部側に位置する前記筒
状カバーの端面をロードセル本体の着力部端面よ
りも必要間隙の幅Ｗだけ短く切削し、切削された
筒状カバーの前記端面と対向して必要間隙の奥行
Ｌを形成する対向部材をロードセル本体の着力部
端面に固定して、筒状カバーと対向部材との間に
幅がＷで奥行がＬの火炎逸走防止用の間隙を形成
する耐圧防爆ロードセルの製造方法。1 A cylindrical cover that is longer than the finished shape covers the strain gauge attachment part of the load cell main body, and its base end is fixed to the base end of the load cell main body, and the cylindrical cover is located on the force applying part side of the load cell main body. The end face of the load cell body is cut shorter by the required gap width W than the end face of the force application part of the load cell main body, and a facing member that faces the cut end face of the cylindrical cover to form the required gap depth L is attached to the force application part of the load cell main body. A method for manufacturing a pressure-resistant explosion-proof load cell, which is fixed to an end face and forms a gap having a width W and a depth L for preventing flame escape between a cylindrical cover and a facing member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23098783A JPS60122340A (en) | 1983-12-06 | 1983-12-06 | Manufacturing method of pressure-resistant and explosion-proof load cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23098783A JPS60122340A (en) | 1983-12-06 | 1983-12-06 | Manufacturing method of pressure-resistant and explosion-proof load cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60122340A JPS60122340A (en) | 1985-06-29 |
| JPH0260135B2 true JPH0260135B2 (en) | 1990-12-14 |
Family
ID=16916452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23098783A Granted JPS60122340A (en) | 1983-12-06 | 1983-12-06 | Manufacturing method of pressure-resistant and explosion-proof load cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60122340A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007071741A (en) * | 2005-09-08 | 2007-03-22 | Matsushita Electric Ind Co Ltd | Strain detector |
-
1983
- 1983-12-06 JP JP23098783A patent/JPS60122340A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60122340A (en) | 1985-06-29 |
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