JP4729655B2 - Vacuum mass measuring device - Google Patents

Vacuum mass measuring device Download PDF

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JP4729655B2
JP4729655B2 JP2004304402A JP2004304402A JP4729655B2 JP 4729655 B2 JP4729655 B2 JP 4729655B2 JP 2004304402 A JP2004304402 A JP 2004304402A JP 2004304402 A JP2004304402 A JP 2004304402A JP 4729655 B2 JP4729655 B2 JP 4729655B2
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vacuum
weighing
mass measuring
measuring device
pan
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JP2006118878A (en
JP2006118878A5 (en
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哲也 阿部
孝造 照沼
富雄 小竹
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独立行政法人 日本原子力研究開発機構
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Description

本発明は、真空状態において質量測定を行い、秤量過程で校正を行い得る真空質量測定装置に関するものである。   The present invention relates to a vacuum mass measuring apparatus capable of performing mass measurement in a vacuum state and performing calibration in a weighing process.

環境の悪い条件で、微小な荷重変化などを精度良く測定することは極めて難しい。   It is extremely difficult to accurately measure minute load changes under adverse environmental conditions.

例えば、真空中において高温の溶融金属から放出されるガス量を時間単位で電子天びんを用いて質量変化として測定をしなければならない場合がある。しかし、電子天びんに対する熱影響等によりその特性が変化し、精度の良い測定が困難な場合が多い。   For example, the amount of gas released from a high-temperature molten metal in a vacuum may have to be measured as a change in mass using an electronic balance in units of time. However, the characteristics of the electronic balance change due to thermal effects, etc., and it is often difficult to measure with high accuracy.

また、そのために頻繁な校正が必要となるが、真空中での校正操作を必要とし、なかなか困難である。   In addition, frequent calibration is required for this purpose, but calibration is required in a vacuum, which is difficult.

本発明の目的は、上述の問題点を解消し、試料皿を設けた真空容器と気密に隔絶した熱遮蔽箱内に秤量手段を配置し、秤量過程中に秤量手段の零点調整による簡便な校正を可能とし、秤量手段の温度による特性変化を補償することができる真空質量測定装置を提供することにある。 The object of the present invention is to solve the above-mentioned problems, and to place a weighing means in a heat shielding box that is airtightly isolated from a vacuum vessel provided with a sample pan, and to perform simple calibration by adjusting the zero point of the weighing means during the weighing process. An object of the present invention is to provide a vacuum mass measuring apparatus that can compensate for changes in characteristics due to the temperature of the weighing means.

上記目的を達成するための本発明に係る真空質量測定装置は、真空容器内において高温の試料を計量皿に載置してその質量変化を測定可能な真空質量測定装置であって、前記真空容器の下部に前記真空容器と気密に隔絶した熱遮蔽箱を設け、該熱遮断箱に秤量手段を内蔵し、該秤量手段は前記真空容器中に配置した前記計量皿を荷重伝達棒を介して支持し、前記計量皿を前記秤量手段から遠隔的に分離して前記秤量手段に前記計量皿の負荷が伝達しないようにする分離手段を設け、前記真空容器内を真空とした測定状態において前記計量皿を前記秤量手段から分離し前記秤量手段の零点調整を行うことを特徴とする。 In order to achieve the above object, a vacuum mass measuring apparatus according to the present invention is a vacuum mass measuring apparatus capable of measuring a mass change of a high-temperature sample placed on a weighing pan in the vacuum container, lower the provided heat shield box that isolated in the vacuum container and airtight, support a built-in weighing means to the heat blocking box, is the weighing means through the load transmitting shaft the weighing pan which is disposed in the vacuum chamber and, separating means loading of the weighing pan so as not to transmit to said weighing means the weighing pan and remotely separated from said weighing means is provided, the pan in the measurement state of the vacuum within the vacuum chamber Is separated from the weighing means, and the zero point of the weighing means is adjusted .

本発明に係る真空質量測定装置によれば、高温の試料による秤量手段に対する温度上昇の影響を緩和し、秤量の過程で秤量手段を任意に零点調整による校正できるので秤量手段の精度を維持できる。 According to the vacuum mass measuring unit according to the present invention, to mitigate the effects of temperature increase for the weighing means by high temperature of the sample, we can maintain the accuracy of the weighing means since it is calibrated by any zero point adjustment the weighing means in the course of weighing .

本発明を図示の実施例に基づいて詳細に説明する。
図1は構成図であり、真空容器1の上部には試料容器2に入れた被計量物Mを出し入れするための開閉可能な蓋部3が設けられており、真空容器1には内部にガスを注入し或いはガスを吸引するためのボンベ或いは吸引ポンプに接続された配管4、5が配設され、配管の途中には開閉弁6、7が設けられている。
The present invention will be described in detail based on the embodiments shown in the drawings.
FIG. 1 is a block diagram, and an openable and closable lid 3 is provided at the top of the vacuum vessel 1 for taking in and out an object M put in a sample vessel 2. Pipes 4 and 5 connected to cylinders or suction pumps for injecting gas or sucking gas are provided, and on-off valves 6 and 7 are provided in the middle of the pipes.

真空容器1の下部には、断熱材を取り付けた熱遮蔽箱8が配置され、この熱遮蔽箱8内の中間には仕切板9が水平に設けられ、この仕切板9の下方の空間内は密閉されており、この空間内に精密電子天びん10が配置されている。この電子天びん10の出力は、真空容器1の外部に配置された制御表示部11に電線12を介して接続されている。   A heat shielding box 8 fitted with a heat insulating material is arranged at the lower part of the vacuum vessel 1, and a partition plate 9 is provided horizontally in the middle of the heat shielding box 8. The precision electronic balance 10 is arranged in this space. The output of the electronic balance 10 is connected to a control display unit 11 disposed outside the vacuum vessel 1 via an electric wire 12.

熱遮蔽箱8の上部には円形の開口13が設けられ、この開口13に円筒状の筒部14が上下に摺動自在に挿通されている。筒部14の上端にはフランジ15が設けられ、筒部14はこのフランジ15を介して開口13の上縁に吊り下げられている。   A circular opening 13 is provided in the upper part of the heat shielding box 8, and a cylindrical tube portion 14 is inserted into the opening 13 so as to be slidable up and down. A flange 15 is provided at the upper end of the cylindrical portion 14, and the cylindrical portion 14 is suspended from the upper edge of the opening 13 via the flange 15.

一方、電子天びん10の上部から上方に向けて、非磁性体から成る荷重伝達棒17が設けられており、この荷重伝達棒17は、仕切板9に設けた孔部16及び筒部14に接触することなく挿通されており、荷重伝達棒17の上端には計量皿18が取り付けられている。   On the other hand, a load transmission rod 17 made of a non-magnetic material is provided upward from the top of the electronic balance 10, and this load transmission rod 17 contacts the hole 16 and the cylinder portion 14 provided in the partition plate 9. The weighing pan 18 is attached to the upper end of the load transmission rod 17.

荷重伝達棒17は中間部において、突き当て構造により上部17aと下部17bに分離可能とされている。また、筒部14の一部には、支点19を中心に回動自在のレバー20の一端が取り付けられ、レバー20の他端にはモータ21により駆動されるカム22が取り付けられている。なお、支点19、モータ21は熱遮蔽箱8内の図示しないフレームに固定され、制御表示部11による指令により作動するようにされている。   The load transmission rod 17 is separable into an upper portion 17a and a lower portion 17b by an abutting structure at an intermediate portion. One end of a lever 20 that is rotatable about a fulcrum 19 is attached to a part of the cylindrical portion 14, and a cam 22 that is driven by a motor 21 is attached to the other end of the lever 20. The fulcrum 19 and the motor 21 are fixed to a frame (not shown) in the heat shielding box 8 and are operated by a command from the control display unit 11.

また図2に示すように、孔部16の周囲には円環状に磁力発生部23が設けられ、その内側の空間部は孔部16とほぼ連通されている。磁力発生部23においては、磁性体24により円環状の永久磁石25が覆われており、更に永久磁石25が内面に露出しないように環状の非磁性体26が内面に取り付けられている。そして、非磁性体26内の空間部には磁性流体27が充填されており、磁性流体27は永久磁石25と磁性体24により形成される磁気回路における磁束による磁気作用により、空間部内に吸着保持されている。   Further, as shown in FIG. 2, a magnetic force generating portion 23 is provided in an annular shape around the hole portion 16, and a space portion inside thereof is substantially communicated with the hole portion 16. In the magnetic force generator 23, an annular permanent magnet 25 is covered with a magnetic body 24, and an annular non-magnetic body 26 is attached to the inner surface so that the permanent magnet 25 is not exposed on the inner surface. The space in the non-magnetic material 26 is filled with a magnetic fluid 27, and the magnetic fluid 27 is attracted and held in the space by the magnetic action of the magnetic flux in the magnetic circuit formed by the permanent magnet 25 and the magnetic material 24. Has been.

荷重伝達棒17は磁性流体27の中を非磁性体26に接触することなく貫通しており、荷重伝達棒17の径は例えば5〜10mmとされ、非磁性体26の内径との間隔は0.5mm程度とされている。このように、上下に仕切板9によって分離された熱遮蔽箱8内の環境雰囲気は、仕切板9に孔部16があっても、磁性流体27により気密に隔絶されることになる。   The load transmission rod 17 penetrates through the magnetic fluid 27 without contacting the non-magnetic body 26. The diameter of the load transmission rod 17 is, for example, 5 to 10 mm, and the distance from the inner diameter of the non-magnetic body 26 is 0. About 5 mm. As described above, the environmental atmosphere in the heat shielding box 8 separated by the partition plate 9 from above and below is hermetically isolated by the magnetic fluid 27 even if the hole 16 is provided in the partition plate 9.

測定中においては、筒部14はフランジ15により熱遮蔽箱8の開口13に吊り下げられ、計量皿18は荷重伝達棒17に支持されている。計量皿18上に例えば熱絶縁用セラミック28を介して、耐熱性の試料容器2に入れた高温の溶融金属から成る被計量物Mを載置することにより、電子天びん10により真空中の被計量物Mから放出されるガス量を秤量によって測定できる。 During the measurement, the cylindrical portion 14 is suspended from the opening 13 of the heat shielding box 8 by the flange 15, and the weighing pan 18 is supported by the load transmission rod 17. An object to be weighed in a vacuum by the electronic balance 10 is placed on the weighing pan 18 by placing an object to be weighed M made of high-temperature molten metal in a heat-resistant sample container 2 through, for example, a ceramic 28 for thermal insulation. The amount of gas released from the object M can be measured by weighing.

即ち、開閉弁6、7を操作して真空容器1内のガスを排出してから測定を始めると、被計量物Mの重量は電子天びん10により検出され、制御表示部11にその数値が表示される。   That is, when the measurement is started after the on-off valves 6 and 7 are operated and the gas in the vacuum container 1 is discharged, the weight of the object M is detected by the electronic balance 10 and the numerical value is displayed on the control display unit 11. Is done.

このとき、真空中に被計量物Mからガスが放出されるので、被計量物Mの秤量値は徐々に減少してゆき、放出されるガスの重量を測定することができる。しかし、この測定において電子天びん10の精度、感度は特に高度に要求され、電子天びん10は熱遮蔽箱8内に収納されているとはいえ、真空容器1内の高温の被計量物Mによる温度影響による測定値の特性変化は避けられない。そのために、秤量過程においても電子天びん10の校正、つまり零点調整を頻繁に行う必要がある。   At this time, since the gas is released from the object to be weighed in the vacuum, the measured value of the object to be weighed M gradually decreases, and the weight of the released gas can be measured. However, in this measurement, the accuracy and sensitivity of the electronic balance 10 are required to be particularly high. Although the electronic balance 10 is housed in the heat shielding box 8, the temperature due to the high-temperature weighing object M in the vacuum vessel 1 is measured. Changes in the characteristics of measured values due to effects are inevitable. Therefore, it is necessary to frequently calibrate the electronic balance 10, that is, to adjust the zero point even in the weighing process.

秤量過程における校正は、一時的に測定を中止して、荷重を零とし零点を調整する。即ち、図3に示すように、制御表示部11を介して遠隔的にモータ21によりカム22を回動することによって、レバー20を動かし筒部14を上昇させ、筒部14の上端のフランジ15により計量皿18を上昇させて支持する。この計量皿18の上昇により、荷重伝達棒17は中間部において上部17aと下部17bに分離され、電子天びん10には計量皿18を含めた上方の荷重が伝達されないので、その状態で制御表示部11によって零点調整による校正を行うことが可能となる。   In the calibration in the weighing process, the measurement is temporarily stopped, the load is set to zero, and the zero point is adjusted. That is, as shown in FIG. 3, the cam 22 is rotated by the motor 21 remotely via the control display unit 11, thereby moving the lever 20 and raising the cylinder part 14, and the flange 15 at the upper end of the cylinder part 14. Thus, the weighing pan 18 is raised and supported. As the weighing pan 18 rises, the load transmitting rod 17 is separated into an upper portion 17a and a lower portion 17b at the intermediate portion, and the upper load including the weighing pan 18 is not transmitted to the electronic balance 10, so that the control display portion is in that state. 11 makes it possible to perform calibration by zero adjustment.

この校正は秤量過程において頻繁に行うことができるので、たとえ測定中に温度変化などによる零点が変動しても、この零点変動を補償し正確な測定が可能となる。   Since this calibration can be frequently performed in the weighing process, even if the zero point fluctuates due to a temperature change or the like during the measurement, the zero point fluctuation is compensated and accurate measurement can be performed.

また、仕切板9の孔部16を気密に閉塞するための磁性流体27を用いることにより、電子天びん10と被計量物Mとの環境条件を分離した状態で測定を行うことができる。特に、電子天びん10を配置した空間部は真空引きがなされないので、その分だけ真空容器1内を排気する時間や、ガスを充填した場合のガス量が少なくて済む。   Further, by using the magnetic fluid 27 for hermetically closing the hole 16 of the partition plate 9, the measurement can be performed in a state where the environmental conditions of the electronic balance 10 and the object to be weighed M are separated. In particular, since the space where the electronic balance 10 is arranged is not evacuated, the time required for evacuating the vacuum container 1 and the amount of gas when filled with gas can be reduced.

なお、荷重伝達棒17は非磁性体であるので、荷重伝達棒17自体が磁力の影響を受けることはない。しかし厳密には、磁性流体27が荷重伝達棒17に及ぼす表面張力は測定精度に影響を与えることになる。しかし、測定すべき荷重の分解能よりも十分に小さな値の表面張力になるように、磁性流体27の保持条件を設定すれば必要な精度を確保することができる。   Since the load transmission rod 17 is a non-magnetic material, the load transmission rod 17 itself is not affected by the magnetic force. However, strictly speaking, the surface tension exerted by the magnetic fluid 27 on the load transmitting rod 17 affects the measurement accuracy. However, if the holding conditions for the magnetic fluid 27 are set so that the surface tension is sufficiently smaller than the resolution of the load to be measured, the required accuracy can be ensured.

実施例の構成図である。It is a block diagram of an Example. 磁性流体による気密手段の構成図である。It is a block diagram of the airtight means by a magnetic fluid. 校正時の説明図である。It is explanatory drawing at the time of calibration.

符号の説明Explanation of symbols

1 真空容器
8 熱遮蔽箱
9 仕切板
10 電子天びん
11 制御表示部
13 開口
14 筒部
15 フランジ
16 孔部
17 荷重伝達棒
18 計量皿
19 支点
20 レバー
21 モータ
22 カム
27 磁性流体
DESCRIPTION OF SYMBOLS 1 Vacuum container 8 Heat shielding box 9 Partition plate 10 Electronic balance 11 Control display part 13 Opening 14 Cylinder part 15 Flange 16 Hole part 17 Load transmission rod 18 Weighing pan 19 Supporting point 20 Lever 21 Motor 22 Cam 27 Magnetic fluid

Claims (5)

真空容器内において高温の試料を計量皿に載置してその質量変化を測定可能な真空質量測定装置であって、前記真空容器の下部に前記真空容器と気密に隔絶した熱遮蔽箱を設け、該熱遮断箱に秤量手段を内蔵し、該秤量手段は前記真空容器中に配置した前記計量皿を荷重伝達棒を介して支持し、前記計量皿を前記秤量手段から遠隔的に分離して前記秤量手段に前記計量皿の負荷が伝達しないようにする分離手段を設け、前記真空容器内を真空とした測定状態において前記計量皿を前記秤量手段から分離し前記秤量手段の零点調整を行うことを特徴とする真空質量測定装置。 A vacuum mass measuring apparatus capable of measuring a mass change by placing a high temperature sample on a weighing pan in a vacuum container, and a heat shielding box hermetically isolated from the vacuum container is provided at a lower part of the vacuum container, a built-in weighing means to the heat blocking box, the weighing means is supported via a load transmitting shaft and said weighing pan which was placed in the vacuum chamber, the remotely isolate the weighing pan from the weighing means Separating means for preventing the load of the weighing pan from being transmitted to the weighing means, and separating the weighing dish from the weighing means in a measurement state in which the inside of the vacuum container is evacuated, and adjusting the zero point of the weighing means. A vacuum mass measuring device. 前記真空容器の上部に、前記試料を前記計量皿に載置するための開閉可能な蓋部を設けた請求項1に記載の真空質量測定装置。 The vacuum mass measuring device according to claim 1, wherein an openable and closable lid for placing the sample on the weighing pan is provided on an upper portion of the vacuum container. 前記分離手段は前記荷重伝達棒を2つの部材から構成し、両部材を上下に分離するようにした請求項1又は2に記載の真空質量測定装置。 The vacuum mass measuring device according to claim 1 or 2, wherein the separating means comprises the load transmitting rod as two members, and both members are separated vertically. 前記荷重伝達棒の前記計量皿を固定した上部を、機械的手段により持ち上げ前記秤量手段から分離するようにした請求項3に記載の真空質量測定装置。   4. The vacuum mass measuring apparatus according to claim 3, wherein an upper portion of the load transmitting rod to which the weighing pan is fixed is lifted by a mechanical means and separated from the weighing means. 前記熱遮蔽箱は前記真空容器と磁性流体により気密に隔絶した請求項1〜4の何れか1つの請求項に記載の真空質量測定装置。 The vacuum mass measuring device according to any one of claims 1 to 4, wherein the heat shielding box is hermetically isolated from the vacuum vessel by a magnetic fluid.
JP2004304402A 2004-10-19 2004-10-19 Vacuum mass measuring device Active JP4729655B2 (en)

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JP5035832B2 (en) * 2007-02-09 2012-09-26 独立行政法人日本原子力研究開発機構 Molten metal weight measuring device
KR101575059B1 (en) 2014-08-13 2015-12-08 대모 엔지니어링 주식회사 Spring and compressed gas type breaker
JP6288026B2 (en) * 2015-09-28 2018-03-07 株式会社タツノ Calibration device
JP6762218B2 (en) * 2016-12-13 2020-09-30 株式会社堀場エステック Flow rate calculation system and flow rate calculation method
JP6971008B2 (en) * 2018-07-03 2021-11-24 レンゴー株式会社 Moisture content continuous measurement method and moisture content continuous measurement device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS636323U (en) * 1986-06-25 1988-01-16
JPH0333622A (en) * 1989-06-30 1991-02-13 Japan Tobacco Inc Calibration mechanism of electronic weighing apparatus
JPH04295726A (en) * 1991-03-25 1992-10-20 Shimadzu Corp Electronic balance
JP2004028856A (en) * 2002-06-27 2004-01-29 Japan Atom Energy Res Inst Device for measuring and testing load

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS636323U (en) * 1986-06-25 1988-01-16
JPH0333622A (en) * 1989-06-30 1991-02-13 Japan Tobacco Inc Calibration mechanism of electronic weighing apparatus
JPH04295726A (en) * 1991-03-25 1992-10-20 Shimadzu Corp Electronic balance
JP2004028856A (en) * 2002-06-27 2004-01-29 Japan Atom Energy Res Inst Device for measuring and testing load

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