JPH08178736A - Weight measuring apparatus - Google Patents
Weight measuring apparatusInfo
- Publication number
- JPH08178736A JPH08178736A JP32258094A JP32258094A JPH08178736A JP H08178736 A JPH08178736 A JP H08178736A JP 32258094 A JP32258094 A JP 32258094A JP 32258094 A JP32258094 A JP 32258094A JP H08178736 A JPH08178736 A JP H08178736A
- Authority
- JP
- Japan
- Prior art keywords
- load
- case
- transmission rod
- weight measuring
- load transmission
- 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】本発明は、医用や薬品・合成化学
などの分野で、蒸気やガス雰囲気中で重量を量る必要の
ある場合に用いられる電子天びんなどの重量測定器に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weight measuring instrument such as an electronic balance which is used when it is necessary to weigh in a vapor or gas atmosphere in the fields of medical treatment, chemicals and synthetic chemistry.
【０００２】[0002]
【従来の技術】電子天びんをはじめとする重量測定器
を、蒸気やガス雰囲気の中で使用する場合、重量測定器
ケースの内部にそのガスなどが侵入して、重量測定器の
機構部分や電子回路などが錆びたり腐食したりすること
がある。それを防ぐために、従来は、図２（ａ）に示す
ように重量測定器内を乾燥空気２１などでガスパージし
たり、図２（ｂ）に示すように秤量皿の下の部分とケー
スとの間に膜３１を張り、重量測定器内部への外気の侵
入を防いでいた。2. Description of the Related Art When a weight measuring instrument such as an electronic balance is used in a vapor or gas atmosphere, the gas or the like enters the inside of the weight measuring instrument case, and the mechanical portion of the weight measuring instrument or the electronic instrument Circuits may rust or corrode. In order to prevent this, conventionally, as shown in FIG. 2A, the inside of the weighing machine is gas-purged with dry air 21 or the like, or as shown in FIG. A film 31 was put between them to prevent outside air from entering the inside of the weighing machine.
【０００３】[0003]
【発明が解決しようとする課題】重量測定器ケースの内
部に雰囲気のガスなどが侵入しないようにするために、
ガスパージをする場合にはパージガスを供給できる場所
でしか使用できず、またガスパージを行ったとしても完
全には外気の流入を防ぐことができない。秤量皿の下の
部分とケースとの間に膜を張る場合には外気の圧力すな
わち大気圧と重量測定器内部の圧力の差によって膜に力
が作用し、測定重量値に誤差が生じる。SUMMARY OF THE INVENTION In order to prevent atmospheric gas and the like from entering the inside of the weight measuring device case,
In the case of gas purging, it can be used only in a place where the purge gas can be supplied, and even if the gas purging is performed, the inflow of outside air cannot be completely prevented. When a film is stretched between the lower part of the weighing pan and the case, a force acts on the film due to the difference between the pressure of the outside air, that is, the atmospheric pressure and the pressure inside the weighing machine, and an error occurs in the measured weight value.
【０００４】本発明の目的は、設置場所に制約されず、
また大気圧の変動にも影響されないで、ガス雰囲気の中
で使用できる気密性の重量測定器を提供することであ
る。The object of the present invention is not limited to the installation location,
Another object of the present invention is to provide an airtight weighing machine that can be used in a gas atmosphere without being affected by fluctuations in atmospheric pressure.
【０００５】[0005]
【課題を解決するための手段】本発明では、上記課題を
解決するために、内部に荷重検出部を収容した密封ケー
スと、ケース外に設けられた荷重受部と、この荷重受部
に作用する負荷を前記ケース内の荷重検出部に伝達する
荷重伝達桿とを有する重量測定器において、前記荷重伝
達桿をケース内へ貫通させるためのケース開口部に対抗
して、ケースの反対側に略同一面積の第２の開口部を穿
設し、両開口部と前記荷重伝達桿とを柔軟性をもつ膜質
材を介してそれぞれ各別に気密にシールした。According to the present invention, in order to solve the above-mentioned problems, a sealed case in which a load detecting portion is housed, a load receiving portion provided outside the case, and the load receiving portion are operated. In a weight measuring instrument having a load transmitting rod for transmitting a load to the load detecting portion in the case, the weight measuring device is opposed to a case opening for penetrating the load transmitting rod into the case, and is substantially on the opposite side of the case. A second opening having the same area was bored, and both openings and the load transmission rod were individually airtightly sealed via a flexible film material.
【０００６】ここでいう荷重検出部は、電子天びんの場
合はロバーバル機構、平衡ビーム、電磁力平衡部などか
らなる荷重測定の心臓部をいいロードセル式はかりなど
にあっては負荷レバー、ロードセルなどからなる機構部
をいう。In the case of an electronic balance, the load detecting section is the heart of load measurement including a Roberval mechanism, a balance beam, an electromagnetic force balance section, and the like. It means a mechanical part.
【０００７】膜質材としては柔軟なゴム膜、伸縮性のあ
るプラスチック膜など、荷重伝達桿の動きに追従して伸
縮し、且つ開口部を気密に封鎖する部材であることが望
ましい。It is desirable that the film material be a member such as a flexible rubber film or a stretchable plastic film that expands and contracts following the movement of the load transmission rod and hermetically seals the opening.
【０００８】[0008]
【作用】ケースの上下にあけた荷重伝達桿が通過する開
口部以外は基本的にケースは気密にしてあり、その開口
部と荷重伝達桿の間は柔軟性のある膜で気密にふさいで
あるので雰囲気ガスはケース内部に侵入しない。この膜
には大気圧とケース内部の圧力の差によって力が働き、
荷重伝達桿を動かそうとするが、本発明では膜が対称的
に上下に設けられており、この上下の膜には全く同じ大
きさの反対向きの力がかかるのでその力は打ち消し合っ
て結果的に荷重伝達桿には大気圧による変位力は働か
ず、測定重量値に影響を与えない。したがって、大気圧
が変動したとしても測定重量値はその影響を受けず常に
正しい値を示す。[Operation] The case is basically airtight except for the openings through which the load transmission rods opened above and below the case pass, and between the opening and the load transmission rod is a flexible film that is airtightly closed. Therefore, ambient gas does not enter the case. Force acts on this membrane due to the difference between atmospheric pressure and the pressure inside the case,
Although the load transfer rod is to be moved, in the present invention, the membranes are symmetrically provided on the upper and lower sides, and the upper and lower membranes are applied with the same force in opposite directions, so that the forces cancel each other out. In addition, the displacement force due to the atmospheric pressure does not act on the load transmission rod, and the measured weight value is not affected. Therefore, even if the atmospheric pressure fluctuates, the measured weight value is not affected by it and always shows a correct value.
【０００９】[0009]
【実施例】図１は本発明の一実施例であり、電磁力平衡
部を持つ上皿式の電子天びんの場合を示す。重量測定の
基本的機構は公知の電子天びんと同様である。荷重伝達
桿１は固定柱２とロバーバル３によって連結され、その
固定柱２に対して平行に上下に動くようになっている。
一方、支点４に支えられた平衡ビーム５の一端は荷重伝
達桿１に固定され、他端には電磁力平衡部６が設けられ
ている。荷重伝達桿１の上には上皿７が設けられてお
り、重量を測定すべき試料はその上皿７に載せるように
なっている。試料の重量は、荷重伝達桿１にかかる重量
と電磁力平衡部６の電磁力を支点４のまわりで釣り合わ
せ、電磁力平衡部の電磁力を発生させるコイルに流れる
電流を計ることにより測定することができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention, showing a case of a precision electronic balance having an electromagnetic force balance section. The basic mechanism for measuring the weight is the same as that of a known electronic balance. The load transmission rod 1 is connected by a fixed column 2 and a Roberval 3, and can move up and down in parallel with the fixed column 2.
On the other hand, one end of the balance beam 5 supported by the fulcrum 4 is fixed to the load transmission rod 1, and the other end is provided with an electromagnetic force balance section 6. An upper plate 7 is provided on the load transmission rod 1, and a sample whose weight is to be measured is placed on the upper plate 7. The weight of the sample is measured by balancing the weight applied to the load transfer rod 1 and the electromagnetic force of the electromagnetic force balance section 6 around the fulcrum 4, and measuring the current flowing through the coil that generates the electromagnetic force of the electromagnetic force balance section. be able to.
【００１０】それらの機構をおおうケース８はおよそ箱
型形状で上と下の板はほぼ水平であり、荷重伝達桿１の
上と下に円形の開口部９と開口部１０があけられてい
る。その開口部以外ケースは気密につくられており、外
部にとり出す必要のある例えば電源コードなども、その
取りだし口に樹脂を充填するなどして密封してある。上
の開口部９にはゴムなどでできた柔軟性のある膜１１が
張られており、下の開口部１０には同様な膜１２が張ら
れている。それぞれの膜は膜おさえリング１３と膜おさ
えリング１４により気密にケース８に取り付けられてい
る。開口部９と開口部１０、および膜１１と膜１２はそ
れぞれ上下で同形状であり、かつ同面積としてある。The case 8 covering these mechanisms is approximately box-shaped, the upper and lower plates are substantially horizontal, and a circular opening 9 and an opening 10 are formed above and below the load transmission rod 1. Other than the opening, the case is made airtight, and a power cord or the like that needs to be taken out is also sealed by filling the take-out port with resin or the like. A flexible film 11 made of rubber or the like is stretched over the upper opening 9, and a similar film 12 is stretched over the lower opening 10. Each of the membranes is attached to the case 8 in an airtight manner by a membrane retainer ring 13 and a membrane retainer ring 14. The opening 9 and the opening 10, and the film 11 and the film 12 have the same shape in the upper and lower sides and have the same area.
【００１１】荷重伝達桿１の縦方向の長さはほぼ膜１１
と膜１２との間の距離と同じにしてあり、膜１１の中央
部は上皿７が乗る荷重伝達桿１の上部に固定され、また
膜１２の中央部は荷重伝達桿１の下端に固定されてい
る。固定の方法は接着やねじ止めなど何でも良いが、そ
の固定部分も気密にしてある。荷重伝達桿１の上端には
試料を載せる上皿７が取り付けられている。The length of the load transfer rod 1 in the longitudinal direction is substantially the same as the film 11.
The distance between the membrane 11 and the membrane 12 is the same, the central portion of the membrane 11 is fixed to the upper portion of the load transmission rod 1 on which the upper plate 7 is mounted, and the central portion of the membrane 12 is fixed to the lower end of the load transmission rod 1. Has been done. Any fixing method such as bonding or screwing may be used, but the fixing portion is also airtight. An upper plate 7 for mounting a sample is attached to the upper end of the load transmission rod 1.
【００１２】以上のように構成すると、電子天びん内部
は外気と遮断されるので、蒸気やガス雰囲気の中でも電
子天びん内部の機構を錆や腐食から守れる。またケース
内部が密閉されているので、ケース内の圧力と外部の圧
力すなわち大気圧との間に差が生じる場合があるが、そ
の場合にも大気圧は外側から膜１１と膜１２に同じよう
にかかり、荷重伝達桿１に対してかかる内外圧力差によ
る上からの力と下からの力は相殺されるので測定重量値
には影響を与えない。膜１１と膜１２の張力は横方向に
かかっているので、上皿に試料が載って荷重伝達桿がわ
ずかに上下に動いた場合でも膜の張力による測定値への
影響はすくない。特に電子天びんでは上皿に試料を載せ
たときにも荷重伝達桿は電磁力平衡部とバランスするの
で上下の位置は変わらず、膜の張力による影響は全くな
い。With the above construction, the inside of the electronic balance is shielded from the outside air, so that the mechanism inside the electronic balance can be protected from rust and corrosion even in a vapor or gas atmosphere. Further, since the inside of the case is sealed, there may be a difference between the pressure inside the case and the outside pressure, that is, the atmospheric pressure. In that case also, the atmospheric pressure is the same from the outside to the membrane 11 and the membrane 12. Therefore, the force from above and the force from below due to the pressure difference between the inside and the outside applied to the load transmission rod 1 are canceled out, so that the measured weight value is not affected. Since the tensions of the membrane 11 and the membrane 12 are applied in the lateral direction, even if the load transmission rod moves slightly up and down with the sample placed on the upper plate, the influence of the membrane tension on the measured value is small. Especially in an electronic balance, even when a sample is placed on the upper plate, the load transmission rod balances with the electromagnetic force balance portion, so the vertical position does not change, and there is no influence of the film tension.
【００１３】図１の実施例では電子天びんの例を示した
が、荷重検出の方法としてロードセルを利用した重量測
定器でも本発明は有効である。ロードセル式の場合、荷
重伝達桿は荷重を載せることによって上下にわずかに動
くが、膜の張力の上下方向の分力は小さいので特に精密
な測定でない限り無視することができる。Although the example of the electronic balance is shown in the embodiment of FIG. 1, the present invention is also effective for a weight measuring device using a load cell as a load detecting method. In the case of the load cell type, the load transfer rod moves slightly up and down by applying a load, but since the vertical component of the membrane tension is small, it can be ignored unless it is a particularly precise measurement.
【００１４】本発明は次のような構成も含むものであ
る。内部に荷重検出部を収容した密封ケースと、ケース
外に設けられた荷重受部と、この荷重受部に作用する負
荷を前記ケース内の荷重検出部に伝達する荷重伝達桿と
を有する電子天びんにおいて、前記荷重伝達桿をケース
内へ貫通させるためのケース開口部に対抗して、ケース
の反対側に略同一形状であり且つ同一面積の第２の開口
部を穿設し、両開口部と前記荷重伝達桿とを柔軟性をも
つ膜質材を介してそれぞれ各別に気密にシールしたこと
を特徴とする電子天びん。The present invention also includes the following configurations. An electronic balance having a sealed case having a load detecting section housed therein, a load receiving section provided outside the case, and a load transmitting rod for transmitting a load acting on the load receiving section to the load detecting section in the case. A second opening having substantially the same shape and the same area is formed on the opposite side of the case so as to oppose the case opening for penetrating the load transmission rod into the case. An electronic balance characterized in that the load transmission rod and the load transmission rod are hermetically sealed via a flexible film material.
【００１５】[0015]
【発明の効果】本発明の重量測定器はその内部がケース
および柔軟性を持つ膜によって気密性が保たれているの
で、蒸気やガス雰囲気中で重量を量る場合に用いること
ができる。しかもその柔軟性を持つ膜はケースの上下に
備わり、上下の膜は荷重伝達桿の上下の端にそれぞれ固
定されているので、大気圧はその膜を介して荷重伝達桿
に上下から均等に加わり、大気圧とケース内部の圧力の
差および大気圧の変動は測定重量値に影響しない。ま
た、本発明の重量測定器はパージガスを必要としないの
で、パージガスの供給源のないところでも設置すること
ができ、移動も簡単である。EFFECTS OF THE INVENTION Since the inside of the weighing machine of the present invention is kept airtight by the case and the flexible film, it can be used when weighing in a vapor or gas atmosphere. Moreover, the flexible membranes are provided on the upper and lower sides of the case, and the upper and lower membranes are fixed to the upper and lower ends of the load transfer rod respectively, so that atmospheric pressure is evenly applied to the load transfer rod from above and below through the film. The difference between the atmospheric pressure and the pressure inside the case and the fluctuation of the atmospheric pressure do not affect the measured weight value. Further, since the weight measuring device of the present invention does not require a purge gas, it can be installed in a place without a supply source of the purge gas and can be easily moved.
【図１】本発明の一実施例である。FIG. 1 is an embodiment of the present invention.
【図２】雰囲気ガスの影響を少なくした従来の例であ
る。FIG. 2 is a conventional example in which the influence of atmospheric gas is reduced.
１…荷重伝達桿 ２…固定柱 ３…ロバーバ
ル ４…支点 ５…平衡ビーム ６…電磁力平衡部 ７…上皿
８…ケース ９…開口部 １０…開口部 １１…膜
１２…膜 １３…膜おさえリング １４…膜おさえリング ２１…乾燥空気 ３１…膜1 ... Load transmission rod 2 ... Fixed column 3 ... Roberval 4 ... Support point 5 ... Balance beam 6 ... Electromagnetic force balance section 7 ... Upper plate
8 ... Case 9 ... Opening 10 ... Opening 11 ... Membrane
12 ... Membrane 13 ... Membrane Retaining Ring 14 ... Membrane Retaining Ring 21 ... Dry Air 31 ... Membrane
Claims (1)
と、ケース外に設けられた荷重受部と、この荷重受部に
作用する負荷を前記ケース内の荷重検出部に伝達する荷
重伝達桿とを有する重量測定器において、前記荷重伝達
桿をケース内へ貫通させるためのケース開口部に対抗し
て、ケースの反対側に略同一面積の第２の開口部を穿設
し、両開口部と前記荷重伝達桿とを柔軟性をもつ膜質材
を介してそれぞれ各別に気密にシールしたことを特徴と
する重量測定器。1. A sealed case having a load detecting section housed therein, a load receiving section provided outside the case, and a load transmitting rod for transmitting a load acting on the load receiving section to the load detecting section in the case. In a weight measuring device having: a second opening having substantially the same area is bored on the opposite side of the case, opposite the case opening for penetrating the load transmission rod into the case; A weight measuring instrument, wherein the load transmitting rod and the load transmitting rod are hermetically sealed separately via a flexible film material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32258094A JP3404945B2 (en) | 1994-12-26 | 1994-12-26 | Weight measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32258094A JP3404945B2 (en) | 1994-12-26 | 1994-12-26 | Weight measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08178736A true JPH08178736A (en) | 1996-07-12 |
| JP3404945B2 JP3404945B2 (en) | 2003-05-12 |
Family
ID=18145283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32258094A Expired - Fee Related JP3404945B2 (en) | 1994-12-26 | 1994-12-26 | Weight measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3404945B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006071391A (en) * | 2004-09-01 | 2006-03-16 | Yamato Scale Co Ltd | Waterproofing type electronic balance |
| JP2006170651A (en) * | 2004-12-13 | 2006-06-29 | Sankyo Paioteku Kk | Shaft sealing system |
| US20170108369A1 (en) * | 2015-02-25 | 2017-04-20 | Vium, Inc | Communicating Scale |
| US20170105385A1 (en) * | 2015-02-25 | 2017-04-20 | Vium, Inc | Animal Cage |
| US20170108368A1 (en) * | 2015-02-25 | 2017-04-20 | Vium, Inc | Scale |
| US10634548B1 (en) * | 2015-02-25 | 2020-04-28 | Vium, Inc | Sterilizable wireless animal scale |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2513136A (en) * | 2013-04-16 | 2014-10-22 | Lakeland Ltd | Weighing Scales |
-
1994
- 1994-12-26 JP JP32258094A patent/JP3404945B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006071391A (en) * | 2004-09-01 | 2006-03-16 | Yamato Scale Co Ltd | Waterproofing type electronic balance |
| JP2006170651A (en) * | 2004-12-13 | 2006-06-29 | Sankyo Paioteku Kk | Shaft sealing system |
| US20170108369A1 (en) * | 2015-02-25 | 2017-04-20 | Vium, Inc | Communicating Scale |
| US20170105385A1 (en) * | 2015-02-25 | 2017-04-20 | Vium, Inc | Animal Cage |
| US20170108368A1 (en) * | 2015-02-25 | 2017-04-20 | Vium, Inc | Scale |
| US10101195B2 (en) * | 2015-02-25 | 2018-10-16 | Vium, Inc. | Sterilizable animal scale |
| US10130071B2 (en) * | 2015-02-25 | 2018-11-20 | Vium, Inc. | Animal cage |
| US10413627B2 (en) * | 2015-02-25 | 2019-09-17 | Vium, Inc. | Communicating scale |
| US10634548B1 (en) * | 2015-02-25 | 2020-04-28 | Vium, Inc | Sterilizable wireless animal scale |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3404945B2 (en) | 2003-05-12 |
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