JP2009036588A - Electronic balance - Google Patents

Electronic balance Download PDF

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JP2009036588A
JP2009036588A JP2007199888A JP2007199888A JP2009036588A JP 2009036588 A JP2009036588 A JP 2009036588A JP 2007199888 A JP2007199888 A JP 2007199888A JP 2007199888 A JP2007199888 A JP 2007199888A JP 2009036588 A JP2009036588 A JP 2009036588A
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load
hole
electronic balance
load receiving
dust
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Nobuyuki Yoshikuwa
伸幸 吉桑
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Shimadzu Corp
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Shimadzu Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent dust-foreign matters from being mixed to a load detection section using or transporting an electronic balance. <P>SOLUTION: Using a load sensor, such as a load cell 6, for detecting the load of a sample to be measured, a load receiving/take-out part 7 for fixing a support member 10 for supporting a load pan 2 by a screw 9 is fixed to the load cell 6 by a screw 8. An annular projection 11 having an inner diameter not less than that of a through hole 12 in a cover 4 is provided at the load receiving/take-out part 7 and the through hole is covered from the inside of a case, thus storing dust and foreign matters entering from the through hole 12 in an annular groove and preventing them from entering the inside of a body 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、電子天びんあるいは電子はかり等（以下単に［電子天びん］という）に関する。   The present invention relates to an electronic balance or an electronic balance (hereinafter simply referred to as “electronic balance”).

従来、電子天びんにおいて、一般に被測定試料の荷重を検出する荷重検出部には、ロバーバル機構を有する長方体のロードセルフレームの歪み発生部に歪みゲージなどの歪みセンサを貼付し、この歪みセンサでブリッジ回路を構成したロードセルや被測定試料の荷重と電磁力をバランスさせてその電磁力発生に要した電流を検出して荷重を検出する荷重検出機構が多く用いられている。   Conventionally, in an electronic balance, a strain sensor such as a strain gauge is attached to a strain generating portion of a rectangular load cell frame having a Roverval mechanism in a load detecting portion that generally detects a load of a sample to be measured. A load detection mechanism that detects the load by balancing the load and the electromagnetic force of the load cell constituting the bridge circuit and the sample to be measured and detecting the current required to generate the electromagnetic force is often used.

図６はロードセルを用いた電子天びん２０の荷重検出部とその周辺部を一部断面で示す構成図である。ロードセル２１の一端側下辺を筐体２２の底部に固定し、他端側上辺に荷重受け皿２３を取り外し自由に支承するための円錐形の支承部材２４を固着した荷重受け持ち出し部２５を固設している。この支承部材２４は、筐体２２に冠着させるカバー２６に設けられた貫通穴２７のほぼ中央に位置して荷重受け皿２３を支承するようにしている（特許文献１参照）。   FIG. 6 is a block diagram showing a partial cross section of the load detecting portion of the electronic balance 20 using the load cell and its peripheral portion. The load cell take-off portion 25 is fixed by fixing a lower end of the load cell 21 to the bottom of the housing 22 and a conical support member 24 fixedly attached to the upper side of the other end of the load cell 21 for free removal. ing. The support member 24 is positioned substantially at the center of a through hole 27 provided in a cover 26 to be attached to the casing 22 so as to support the load receiving tray 23 (see Patent Document 1).

図７は電磁力発生装置３７で発生する電磁力と被測定試料の荷重をバランスさせる電磁力平衡機構を用いた電子天びん３０の荷重検出部とその周辺部を一部断面で示す構成図である。母材をくり抜きロバーバル機構とレバー機構を形成した機構ブロック３１の一端側下辺を筐体３３の底部に固定し、他端側上辺に円錐形の支承部材３２を固着している。この支承部材３２は、筐体３３に冠着させるカバー３４に設けられた貫通穴３５のほぼ中央に位置して荷重受け皿３６を支承するようにしている（特許文献２参照）。
特開平７−３５６０１号公報 特開２００２−１４８１０５号公報 FIG. 7 is a block diagram showing a partial cross-section of the load detecting portion of the electronic balance 30 using the electromagnetic force balance mechanism that balances the electromagnetic force generated by the electromagnetic force generator 37 and the load of the sample to be measured. . The lower end of one end side of the mechanism block 31 in which the base material is cut out to form the Roverval mechanism and the lever mechanism is fixed to the bottom of the housing 33, and the conical support member 32 is fixed to the upper end of the other end side. The support member 32 is positioned approximately at the center of a through hole 35 provided in a cover 34 to be attached to the casing 33 so as to support a load receiving tray 36 (see Patent Document 2).
JP-A-7-35601 JP 2002-148105 A

従来の電子天びんは上記のように構成されているが、使用場所に存在する粉塵や異物が図６の矢印Ａで示すように貫通穴２７を通過してカバー２６の内部に浸入したり、図７の矢印Ｂで示すように貫通穴３５を通過してカバー３４内部に浸入して蓄積したりする。これらの塵埃や異物がロードセル２１や機構ブロック３１などの荷重検出部の上辺に蓄積し移動したりすると、これらの荷重負荷が被測定試料の荷重に加算され、測定精度誤差を増大変動させるという問題がある。このため貫通穴２７や同３５とその内部周辺部品との隙間をなるべく小さくしたり、貫通穴の周囲に下方向きに環状突起を設けたりするなどしてできるだけ塵埃や異物の侵入を抑制するようにしている。   The conventional electronic balance is configured as described above. However, dust or foreign matter existing at the place of use passes through the through hole 27 as shown by an arrow A in FIG. 7 passes through the through hole 35 as shown by an arrow B in FIG. When these dust and foreign matter accumulate and move on the upper side of the load detection unit such as the load cell 21 or the mechanism block 31, these load loads are added to the load of the sample to be measured, and the measurement accuracy error increases and fluctuates. There is. For this reason, intrusion of dust and foreign matter is suppressed as much as possible by reducing the gap between the through hole 27 or 35 and the peripheral components inside as much as possible, or by providing an annular protrusion downward around the through hole. ing.

しかしながら、使用期間中に蓄積した塵埃や異物を清掃する時、あるいは工場からの出荷や使用場所の変更などで遠方輸送する場合においては荷重受け皿を外して輸送されるので、カバーの貫通穴全体が開放状態となり、周辺の塵埃や異物が混入する危険が増大する。また、蓄積された塵埃や異物は使用環境の振動や試料載置毎に発生する振動などによってより内部に移動し、測定誤差の増大や変動を発生させるとともに、侵入した異物や塵埃を清掃するにはカバーを外さねばならず非常に手間がかかる上、本体に損傷を与える危険があるという問題がある。
本発明は、このような事情に鑑みてなされたものであり、荷重検出部への粉塵等の不要物が本体内部に侵入し難い電子天びんを提供することを目的とする。 However, when cleaning dust and foreign matter accumulated during the period of use, or when transporting far away due to shipment from the factory or changing the place of use, etc., the load pan is removed, so the entire through hole of the cover It becomes an open state, and the risk of contamination of surrounding dust and foreign matter increases. Accumulated dust and foreign matter move to the inside due to vibrations in the environment of use and vibration that occurs each time the sample is placed, causing measurement errors to increase and fluctuate, and clean up foreign matter and dust that has entered. However, there is a problem that the cover must be removed, which is very troublesome and there is a risk of damaging the main body.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an electronic balance in which an unnecessary object such as dust on the load detection unit does not easily enter the inside of the main body.

上記の目的を達成するため、本発明による電子天びんは、被測定試料を載置する荷重受け皿と、被測定試料の荷重を検出する荷重センサと、前記荷重センサに固設され荷重受け皿を支承する荷重受け持ち出し部と、貫通穴を有するカバーとを備え、前記荷重受け皿は前記貫通穴を通して前記荷重受け持ち出し部に支承されており、前記荷重受け持ち出し部における前記荷重受け皿が支承される箇所の周囲を囲む突起物が設けられ、当該突起物の内壁が前記貫通穴と同位置または外側に位置しているものである。   In order to achieve the above object, an electronic balance according to the present invention provides a load pan for placing a sample to be measured, a load sensor for detecting the load of the sample to be measured, and a load pan that is fixed to the load sensor and supports the load pan. A load receiving portion and a cover having a through hole, wherein the load tray is supported by the load receiving portion through the through hole, and around the portion of the load receiving portion where the load tray is supported Is provided, and the inner wall of the protrusion is located at the same position as or outside of the through hole.

本発明による電子天びんは、カバーの貫通穴と同径以上の径の環状突起部を荷重受け持ち出し部に設けているので、貫通穴から侵入した塵埃や異物は環状突起部内に留められ、荷重検出部への不当アクセスが防止できるとともに塵埃の清掃や異物除去が容易に行なえる。   The electronic balance according to the present invention is provided with an annular projection having a diameter equal to or larger than the through hole of the cover in the load receiving portion, so that dust and foreign matter entering from the through hole are retained in the annular projection and the load is detected. Unauthorized access to the parts can be prevented and dust can be easily cleaned and foreign matter removed.

本発明を電子天びんに適用した場合の実施例を図面を参照しながら説明する。図１は実施例による電子天びん１の外観斜視図、図２は電子天びん１の荷重検出部とその周辺部の一部断面を示す構成図、図３は実施例に係る荷重受け持ち出し部の斜視図である。   An embodiment when the present invention is applied to an electronic balance will be described with reference to the drawings. FIG. 1 is an external perspective view of an electronic balance 1 according to the embodiment, FIG. 2 is a configuration diagram showing a partial cross section of a load detecting portion and its peripheral portion of the electronic balance 1, and FIG. 3 is a perspective view of a load carrying-out portion according to the embodiment. FIG.

本電子天びん１は、図１に示すような荷重受け皿２と、この荷重受け皿２を下方から支承し、被測定試料の荷重を検出して質量値に変換し、その質量値を表示する構成要素を筐体３とそのカバー４内に配設した本体５から構成されている。この本体５の被測定試料の荷重を検出する構成要素には図２に示すようなロバーバル機構を形成し、各薄肉部に歪みセンサ（図示省略）が貼り付けられこの歪みセンサでホイートストーンブリッジ回路を構成した公知のロードセル６が用いられている。このロードセル６の一端（図２では左端）側上辺に図３に示すような荷重受け持ち出し部７が一体成形あるいはねじ８で固着され、他端側下辺は筐体３の底部に固定されている。   The electronic balance 1 includes a load pan 2 as shown in FIG. 1 and components that support the load pan 2 from below, detect the load of the sample to be measured, convert it to a mass value, and display the mass value. Is composed of a main body 5 disposed in a housing 3 and a cover 4 thereof. As a constituent element for detecting the load of the sample to be measured of the main body 5, a Roverval mechanism as shown in FIG. 2 is formed, and a strain sensor (not shown) is affixed to each thin-walled portion, and this strain sensor is used as a Wheatstone bridge A known load cell 6 constituting a circuit is used. A load receiving portion 7 as shown in FIG. 3 is integrally formed or fixed with a screw 8 on the upper side of one end (left end in FIG. 2) of the load cell 6, and the lower side on the other end side is fixed to the bottom of the housing 3. .

図３、４を参照して、荷重受け持ち出し部７の構成を説明する。図３は荷重受け持ち出し部７の斜視図である。また、図４は、貫通穴１２周辺の拡大断面図である。荷重受け持ち出し部７には図３に示すようにねじ９により荷重受け皿２を支承するための支承部材１０が螺合され、その外周上に環状突起部１１が形成されている。前記支承部材１０の先端部は、カバー４の貫通穴１２から上部に突出している。前記環状突起部１１の内径は前記貫通穴１２の直径と同一またはそれ以上の径とし、高さは５ｍｍ程度以上、カバー４の貫通穴１２の周辺部内面と環状突起部１１の上面間の間隙幅は１ｍｍ程度に形成されている。   With reference to FIGS. 3 and 4, the configuration of the load receiving / carrying portion 7 will be described. FIG. 3 is a perspective view of the load receiving / carrying portion 7. FIG. 4 is an enlarged cross-sectional view around the through hole 12. As shown in FIG. 3, a support member 10 for supporting the load receiving tray 2 is screwed onto the load receiving portion 7 by a screw 9, and an annular protrusion 11 is formed on the outer periphery thereof. The distal end portion of the support member 10 protrudes upward from the through hole 12 of the cover 4. The inner diameter of the annular protrusion 11 is equal to or larger than the diameter of the through hole 12, the height is about 5 mm or more, and the gap between the inner surface of the peripheral part of the through hole 12 of the cover 4 and the upper surface of the annular protrusion 11. The width is about 1 mm.

上記電子天びん１の荷重受け皿２に被測定試料を載置すると、被測定試料の荷重が左端側に加わり、ロバーバル機構を介して各薄肉部に歪みが発生する。荷重作用点側の薄肉部には圧縮力、固定側の薄肉部には引張力が加わり、ロードセル６のホイートストーンブリッジ回路より被測定試料の荷重に比例したアナログ電気信号が検出される。この検出信号はマイクロコンピュータを主体とする演算処理部において公知の質量値換算処理が行なわれ、その質量値が表示される。   When the sample to be measured is placed on the load tray 2 of the electronic balance 1, the load of the sample to be measured is applied to the left end side, and distortion occurs in each thin portion via the Roverval mechanism. A compressive force is applied to the thin portion on the load acting point side, and a tensile force is applied to the thin portion on the fixed side, and an analog electric signal proportional to the load of the sample to be measured is detected from the Wheatstone bridge circuit of the load cell 6. This detection signal is subjected to a known mass value conversion process in an arithmetic processing unit mainly composed of a microcomputer, and the mass value is displayed.

この電子天びん１が使用環境中に置かれた場合、その環境中に存在する塵埃や異物が矢印Ａで示す方向からカバー４の貫通穴１２と荷重受け皿２との間隙を通って侵入するが、荷重受け持ち出し部７上に環状突起部１１が存在し、その内径が貫通穴１２の直径以上であり、かつカバー４の内面と環状突起部１１の上面間の間隙が小さいために、塵埃や異物などの大部分は環状突起部１１と支承部材１０で形成される環状溝１３内に蓄積される。この蓄積された塵埃や異物は、電子天びん１から荷重受け皿２を取り外し、スポイド等の吸入器で吸引することにより容易に吸い取り除去することができる。環境状態に応じた定期期間ごとの清掃を行なうことにより、精度誤差への影響を除去することができる。   When the electronic balance 1 is placed in a use environment, dust and foreign matter existing in the environment enter through the gap between the through hole 12 of the cover 4 and the load tray 2 from the direction indicated by the arrow A. Since the annular protrusion 11 is present on the load carrying-out part 7, the inner diameter thereof is equal to or larger than the diameter of the through hole 12, and the gap between the inner surface of the cover 4 and the upper surface of the annular protrusion 11 is small, dust and foreign matter And the like are accumulated in an annular groove 13 formed by the annular protrusion 11 and the support member 10. The accumulated dust and foreign matter can be easily sucked and removed by removing the load tray 2 from the electronic balance 1 and sucking it with an inhaler such as a spoid. By performing cleaning at regular intervals according to environmental conditions, it is possible to eliminate the influence on accuracy error.

また、電子天びんは出荷時、あるいは使用場所を遠方に変更するような場合、通常、一旦荷重受け皿２を本体５から外しておのおの梱包し輸送し、使用場所で開梱して荷重受け皿２を再度本体５に取り付け直す一連の作業を必要とする。この場合にも環状突起部１１が存在することにより作業中に塵埃や異物が貫通穴１２に混入しても、環状突起部１１で本体５内への進入路が防止されているため、塵埃や異物などの大部分は環状突起部１１と支承部材１０で形成される環状溝１３内に蓄積される。   In addition, when the electronic balance is shipped or when the place of use is changed to a remote location, usually, the load pan 2 is once removed from the main body 5 and packed, transported, unpacked at the place of use, and the load pan 2 is remounted. A series of operations for reattaching to the main body 5 is required. Also in this case, since the annular protrusion 11 is present, even if dust or foreign matter is mixed into the through-hole 12 during work, the annular protrusion 11 prevents the entry path into the main body 5. Most of foreign matters and the like are accumulated in an annular groove 13 formed by the annular protrusion 11 and the support member 10.

図５は電子天びん１４の構成図で、電子天びん３０と同一機能部品には同一記号が付されている。本電子天びん１４は、機構ブロック３１の一端側上辺に支承部材１５とカバー３４の貫通穴３５より広い内周を有する環状突起部１６を設けた荷重受け持ち出し部１７を固設している。これにより、貫通穴３５から侵入する塵埃や異物を環状突起部１６内に閉じ込め、ケース３４内部への侵入が防止される。   FIG. 5 is a configuration diagram of the electronic balance 14, and the same symbols are attached to the same functional parts as the electronic balance 30. In the electronic balance 14, a load receiving / carrying portion 17 provided with an annular protrusion 16 having an inner circumference wider than the through hole 35 of the support member 15 and the cover 34 is fixedly provided on the upper end of one end of the mechanism block 31. As a result, dust and foreign matter entering from the through hole 35 are confined in the annular protrusion 16, and entry into the case 34 is prevented.

なお、本発明は上記実施例に限定されるものではなく、例えば前記環状突起部１１、１６の断面形状、貫通穴１２は多角形などの円形以外の形状を用いることも可能である。   In addition, this invention is not limited to the said Example, For example, the cross-sectional shape of the said cyclic | annular protrusion parts 11 and 16 and the through holes 12 can also use shapes other than circular shapes, such as a polygon.

本発明は、電子天びんのみならず、同様の目的で使用されている電子はかり（電子秤）にも適用可能である。   The present invention can be applied not only to an electronic balance but also to an electronic balance (electronic balance) used for the same purpose.

本発明実施例の電子天びんの外観斜視図である。1 is an external perspective view of an electronic balance according to an embodiment of the present invention. 実施例の電子天びんの一部断面を示す構成図である。It is a block diagram which shows the partial cross section of the electronic balance of an Example. 実施例に係る荷重受け持ち出し部の斜視図である。It is a perspective view of the load receiving / taking-out part which concerns on an Example. 貫通穴１２の周辺部の拡大断面図である。3 is an enlarged cross-sectional view of a peripheral portion of a through hole 12. FIG. 実施例の電子天びんの一部断面を示す構成図である。It is a block diagram which shows the partial cross section of the electronic balance of an Example. ロードセルを用いた電子天びん２０の荷重検出部とその周辺部の一部断面を示す構成図である。It is a block diagram which shows the partial cross section of the load detection part of the electronic balance 20 using a load cell, and its peripheral part. 電磁力平衡機構を用いた電子天びん３０の荷重検出部とその周辺部の一部断面を示す構成図である。It is a block diagram which shows the partial cross section of the load detection part of the electronic balance 30 using an electromagnetic force balance mechanism, and its peripheral part.

符号の説明Explanation of symbols

１ 電子天びん
２ 荷重受け皿
３ 筐体
４ カバー
５ 本体
６ ロードセル
７ 荷重受け持ち出し部
８ ねじ
９ ねじ
１０ 支承部材
１１ 環状突起部
１２ 貫通穴
１３ 環状溝
１４ 電子天びん
１５ 支承部材
１６ 環状突起部
１７ 荷重受け持ち出し部
２０ 電子天びん
２１ ロードセル
２２ 筐体
２３ 荷重受け皿
２４ 支承部材
２５ 荷重受け持ち出し部
２６ カバー
２７ 貫通穴
３０ 電子天びん
３１ 機構ブロック
３２ 支承部材
３３ 筐体
３４ カバー
３５ 貫通穴
３６ 荷重受け皿
３７ 電磁力発生装置 DESCRIPTION OF SYMBOLS 1 Electronic balance 2 Load receiving tray 3 Housing | casing 4 Cover 5 Main body 6 Load cell 7 Load taking-out part 8 Screw 9 Screw 10 Bearing member 11 Annular projection part 12 Through-hole 13 Annular groove 14 Electronic balance 15 Bearing member 16 Annular protrusion part 17 Load receiving Carry-out part 20 Electronic balance 21 Load cell 22 Housing 23 Load receiving tray 24 Bearing member 25 Load receiving take-out part 26 Cover 27 Through hole 30 Electronic balance 31 Mechanism block 32 Bearing member 33 Housing 34 Cover 35 Through hole 36 Load receiving tray 37 Electromagnetic force generation apparatus

Claims (1)

被測定試料を載置する荷重受け皿と、被測定試料の荷重を検出する荷重センサと、前記荷重センサに固設され荷重受け皿を支承する荷重受け持ち出し部と、貫通穴を有するカバーとを備え、前記荷重受け皿は前記貫通穴を通して前記荷重受け持ち出し部に支承されており、前記荷重受け持ち出し部における前記荷重受け皿が支承される箇所の周囲を囲む突起物が設けられ、当該突起物の内壁が前記貫通穴と同位置または外側に位置していることを特徴とする電子天びん。 A load tray for placing the sample to be measured, a load sensor for detecting the load of the sample to be measured, a load receiving portion fixed to the load sensor for supporting the load tray, and a cover having a through hole, The load receiving tray is supported by the load receiving portion through the through hole, and a protrusion is provided around a portion of the load receiving portion where the load receiving tray is supported, and the inner wall of the protrusion is An electronic balance characterized by being located at the same position as or outside of the through hole.
JP2007199888A 2007-07-31 2007-07-31 Electronic balance Pending JP2009036588A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017104031A (en) * 2015-12-08 2017-06-15 鈴茂器工株式会社 Food material measuring device
JP2022112691A (en) * 2021-01-22 2022-08-03 日立グローバルライフソリューションズ株式会社 Storage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5119413Y1 (en) * 1970-03-20 1976-05-21
JPS54134067A (en) * 1978-04-05 1979-10-18 Kaaruton Co Production of chisel type cutter link
JPS5748428A (en) * 1980-08-27 1982-03-19 Mitsubishi Electric Corp Electrical discharge machining apparatus
JPS611136A (en) * 1984-06-14 1986-01-07 Matsushita Electric Works Ltd Load supervisory control system
JPS62179615A (en) * 1986-02-04 1987-08-06 Ee & D:Kk High resolution weighing apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5119413Y1 (en) * 1970-03-20 1976-05-21
JPS54134067A (en) * 1978-04-05 1979-10-18 Kaaruton Co Production of chisel type cutter link
JPS5748428A (en) * 1980-08-27 1982-03-19 Mitsubishi Electric Corp Electrical discharge machining apparatus
JPS611136A (en) * 1984-06-14 1986-01-07 Matsushita Electric Works Ltd Load supervisory control system
JPS62179615A (en) * 1986-02-04 1987-08-06 Ee & D:Kk High resolution weighing apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017104031A (en) * 2015-12-08 2017-06-15 鈴茂器工株式会社 Food material measuring device
JP2022112691A (en) * 2021-01-22 2022-08-03 日立グローバルライフソリューションズ株式会社 Storage
JP7503507B2 (en) 2021-01-22 2024-06-20 日立グローバルライフソリューションズ株式会社 refrigerator

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