JP5065178B2 - Scale - Google Patents
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- JP5065178B2 JP5065178B2 JP2008164341A JP2008164341A JP5065178B2 JP 5065178 B2 JP5065178 B2 JP 5065178B2 JP 2008164341 A JP2008164341 A JP 2008164341A JP 2008164341 A JP2008164341 A JP 2008164341A JP 5065178 B2 JP5065178 B2 JP 5065178B2
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本発明は、防水・防塵機能を備えた秤に関し、特に、秤の内外の気圧差を解消し、高精度の計測を可能にするものである。 The present invention relates to a balance having a waterproof / dustproof function, and in particular, eliminates the pressure difference between the inside and outside of the balance and enables high-precision measurement.
防水機能を備えた秤は、従来から、食品や水産物などを扱う分野で広く利用され、使用後に秤量皿の汚れを落とすためにホースで水を掛けるような使われ方がされている。
近年、水やホコリが機器に降り掛かる生産や流通の現場、あるいは、オイルミストが充満する切削加工の作業現場等でも高精度の計量の必要性が高まっており、それに応える防水・防塵構造の電子天秤の出現が求められている。
オイルミストの正体は、切削油が高速回転する工具や被削材に当たって生成される、空気中を漂う微細な油剤粒子や、加工時の加工熱で発生する油煙等である。
Conventionally, a scale having a waterproof function has been widely used in the field of handling foods and marine products, and has been used in such a manner that a hose is used to remove dirt from a weighing dish after use.
In recent years, there has been an increasing need for high-precision weighing in production and distribution sites where water and dust fall on equipment, or in cutting work sites filled with oil mist. The appearance of a balance is required.
The true nature of the oil mist is fine oil particles floating in the air generated by the cutting oil hitting a tool or work material that rotates at high speed, or oil smoke generated by processing heat during processing.
従来の防水・防塵秤は、秤量皿の荷重を伝える荷重伝達棒が、荷重に応じて上下に変位できるように、密閉された筐体の開口にダイアフラムで接続されている。
また、筐体の内圧と外気圧との間に差があると計量誤差の原因になるため、筐体に通気孔を設け、この孔を防水性、防塵性及び通気性を兼ね備えた多孔質の部材で塞いでいる(下記特許文献1参照)。
この通気孔は、秤量皿に荷重を載せたときに、ダイアフラムの変形に伴って圧縮される測定空間の空気を逃がし、また、荷重が除かれたときに、ダイアフラムの復帰に伴って負圧となる測定空間内に外気を供給する働きをしている。そのため、測定空間の内外気圧差が解消され、計量誤差が防止できる。
In addition, if there is a difference between the internal pressure and the external pressure of the housing, it may cause a measurement error.Therefore, a ventilation hole is provided in the housing, and this hole is made of a porous material that is waterproof, dustproof, and breathable. It is closed with a member (see Patent Document 1 below).
This vent vents the air in the measurement space that is compressed as the diaphragm is deformed when a load is placed on the weighing pan, and when the load is removed, negative pressure is applied as the diaphragm returns. It serves to supply outside air into the measurement space. Therefore, the internal and external pressure differences in the measurement space are eliminated, and measurement errors can be prevented.
しかし、防水・防塵秤では、通気孔の面積が狭いと、筐体内の圧縮された空気を外に排出したり、負圧となった筐体内に空気を吸引したりするために多くの時間が掛かる。そのため、精確な計量を迅速に実施することができない。また、この点を改善するため、通気孔の面積を広げると、通気孔を塞ぐ多孔質の孔から水分等が浸入する可能性が高まり、防水性能、防塵性能の低下が懸念される。
また、油剤粒子や油煙から成るオイルミストは、多孔質の部材の孔を詰まらせる。粉粒体を扱う現場や粉砕処理を行う工場等で発生する微細な粉体も同様である。そのため、従来の防水・防塵秤は、オイルミストや微細な粉体が発生する環境下で長期間使用することができない。
However, in a waterproof / dustproof balance, if the area of the vent hole is small, it takes a lot of time to exhaust the compressed air inside the housing to the outside or to suck air into the housing that has become negative pressure. It takes. Therefore, accurate measurement cannot be performed quickly. Further, if the area of the vent hole is increased in order to improve this point, there is a concern that moisture or the like may enter from the porous hole that closes the vent hole, and there is a concern that the waterproof performance and the dust proof performance are deteriorated.
Moreover, the oil mist which consists of oil agent particle | grains or oil smoke clogs the hole of a porous member. The same applies to the fine powder generated at the site where the granular material is handled or at the factory where the pulverization is performed. Therefore, the conventional waterproof / dustproof balance cannot be used for a long time in an environment where oil mist or fine powder is generated.
本発明は、こうした事情を考慮して創案したものであり、オイルミストや微細な粉体が浮遊する環境下でも安定して使用できる防水・防塵機能を備えた秤を提供することを目的としている。 The present invention was created in view of such circumstances, and an object thereof is to provide a scale having a waterproof / dustproof function that can be used stably even in an environment where oil mist and fine powder float. .
本発明は、防水・防塵機能を備えた秤であって、筐体の底部の一部を内側に窪ませて形成した傾斜面と、前記傾斜面の最も低い位置で該傾斜面を貫通する一または複数個の貫通孔と、前記貫通孔に連なる部屋を筐体内の前記傾斜面上に画成するために前記筐体の内側に形成された内壁と、前記部屋を取り囲む前記内壁の前記傾斜面と反対の側を塞ぐ多孔質膜と、前記貫通孔を前記底部の外側から塞ぐ不織布フィルターと、を備え、前記貫通孔の断面積が、前記多孔質膜の面積よりも狭く、且つ、該貫通孔を前記不織布フィルターで塞いだ状態での単位時間当たりの通気量が、前記多孔質膜の単位時間当たりの通気量を下回らない広さに設定されていることを特徴としている。
この秤は、多孔質膜、部屋、貫通孔及び不織布フィルターを介して筐体内外の通気が行われる。多孔質膜は、外界に面していないために、水等が掛かり難い。そのため、その面積を広く設定して、測定空間の内外気圧差を迅速に解消することができる。また、不織布フィルターは、オイルミストや微細な粉体が筐体内へ侵入するのを防ぐ働きをする。
The present invention is a scale having a waterproof and dustproof function, and an inclined surface formed by recessing a part of the bottom of the housing inward, and a penetrating through the inclined surface at the lowest position of the inclined surface. Alternatively, a plurality of through holes, an inner wall formed inside the casing to define a room connected to the through holes on the inclined plane in the casing, and the inclined plane of the inner wall surrounding the room And a non-woven filter that closes the through-hole from the outside of the bottom, and the cross-sectional area of the through-hole is smaller than the area of the porous membrane, and the through-hole The air flow rate per unit time in a state where the pores are closed with the nonwoven fabric filter is set to a size that does not fall below the air flow rate per unit time of the porous membrane .
This balance is ventilated inside and outside the casing through a porous membrane, a room, a through hole, and a nonwoven fabric filter. Since the porous membrane does not face the outside world, it is difficult to splash water or the like. Therefore, it is possible to quickly eliminate the difference between the internal and external pressures in the measurement space by setting the area wide. The non-woven filter functions to prevent oil mist and fine powder from entering the housing.
また、筐体内に設けた部屋の中に、貫通孔を通って水が入った場合でも、底部が傾斜し、底部の最も低い位置に貫通孔が在るため、部屋に入った水が自動的に排水される。 Further, in the room provided in the housing, through the through hole even if the container of water, the bottom is inclined, since there is the lowest position in the through hole of the bottom, entered the room water automatically To be drained.
また、本発明の秤は、前記不織布フィルターが、交換可能な形態で前記底部の外側に取り付けられていることが好ましい。
不織布フィルターがオイルミストや微細な粉体により目詰まりした場合に、新しい不織布フィルターと簡単に交換することができる。
Moreover, it is preferable that the scale of this invention is attached to the outer side of the said bottom part in the form in which the said nonwoven fabric filter is replaceable.
When the non-woven filter is clogged with oil mist or fine powder, it can be easily replaced with a new non-woven filter.
本発明の秤は、オイルミストや微細な粉体が発生する現場等でも、安定して高精度の計量を実施することができる。 The scale according to the present invention can stably perform high-precision measurement even at a site where oil mist or fine powder is generated.
本発明の実施形態について、図面を用いて説明する。
図1は、本発明の実施形態に係る防水・防塵秤の外観図、図2は、この秤の分解斜視図、図3は、図1の秤のA−A方向の断面図、図4は、図3の一部拡大図、図5は、通気孔を備える秤の底部を示す図、また、図6は、交換可能に取り付けた不織布フィルターを示す図である。
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an external view of a waterproof / dustproof balance according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the balance, FIG. 3 is a cross-sectional view of the balance of FIG. FIG. 5 is a partially enlarged view of FIG. 3, FIG. 5 is a view showing the bottom of a balance provided with vent holes, and FIG. 6 is a view showing a non-woven filter attached in an exchangeable manner.
この防水・防塵秤は、図1及び図2に示すように、被計量物を載せる秤量皿10と、秤量皿10を支持する皿受板11と、表示窓123や開口122が設けられた上部筐体121と、電子表示板18及び所要の電子回路が搭載された回路基板19や電池ボックス17、さらには、ユニット化された計量ブロック40が固定される下部筐体124とを有している。下部筐体124の裏側には、高さの調節が可能な支持脚20を設けている。
この上部筐体121は、下部筐体124に気密に嵌合される。また、秤量皿10上の荷重を受けて上下方向に変位する計量ブロック40の荷重受け部がダイアフラム48に接続され、上部筐体121の開口122は、このダイアフラム48により気密に塞がれる。
この防水・防塵秤の内外気圧差を解消する通気孔50は、図3の点線で囲む部分に形成されている。図4に通気孔50を拡大して示し、図5に、下部筐体124の外側から見た通気孔50を示している。
As shown in FIGS. 1 and 2, the waterproof / dustproof balance includes a weighing pan 10 for placing an object to be weighed, a tray receiving plate 11 for supporting the weighing pan 10, an upper portion provided with a display window 123 and an opening 122. The housing 121 includes a circuit board 19 and a battery box 17 on which the electronic display board 18 and necessary electronic circuits are mounted, and a lower housing 124 to which the unitized measuring block 40 is fixed. . A support leg 20 whose height can be adjusted is provided on the back side of the lower housing 124.
The upper casing 121 is fitted in the lower casing 124 in an airtight manner. In addition, a load receiving portion of the weighing block 40 that is displaced in the vertical direction in response to a load on the weighing pan 10 is connected to the diaphragm 48, and the opening 122 of the upper housing 121 is airtightly closed by the diaphragm 48.
The vent hole 50 for eliminating the difference between the internal and external pressures of the waterproof / dustproof balance is formed in a portion surrounded by a dotted line in FIG. FIG. 4 shows the vent hole 50 in an enlarged manner, and FIG. 5 shows the vent hole 50 as viewed from the outside of the lower housing 124.
この通気孔50は、下部筐体124の一部を内側に窪ませて形成した傾斜面125に設けられている。通気孔50は、傾斜面125を貫通する貫通孔51と、貫通孔51に連なる部屋52を画成するために下部筐体124の内側に形成された内壁53と、この部屋52を取り囲む内壁53の頂部側を塞ぐ多孔質膜54と、貫通孔51を下部筐体124の外側から塞ぐ不織布フィルター55とを有している。 The vent hole 50 is provided on an inclined surface 125 formed by recessing a part of the lower housing 124 inward. The ventilation hole 50 includes a through-hole 51 that penetrates the inclined surface 125, an inner wall 53 that is formed inside the lower housing 124 to define a room 52 that continues to the through-hole 51, and an inner wall 53 that surrounds the room 52. A porous membrane 54 that closes the top of the lower casing 124, and a nonwoven fabric filter 55 that closes the through hole 51 from the outside of the lower housing 124.
ここでは、多孔質膜54を内壁53の頂部側に貼り付け、また、不織布フィルター55を、下部筐体124の外側から貫通孔51を塞ぐ位置に貼り付けている。図5の下部筐体124の外側に現れている二つの円形の不織布フィルター55の下に、二つの貫通孔51が隠れている。なお、貫通孔51は、1つでも良く、或いは、3つ以上でも良い。
これらの貫通孔51は、図4に示すように、部屋52の底面を構成する傾斜面125の最も低い位置で部屋52に連通している。
Here, the porous membrane 54 is affixed to the top side of the inner wall 53, and the nonwoven fabric filter 55 is affixed at a position that closes the through hole 51 from the outside of the lower housing 124. Two through holes 51 are hidden under the two circular nonwoven fabric filters 55 appearing outside the lower housing 124 of FIG. The number of through holes 51 may be one, or three or more.
As shown in FIG. 4, these through holes 51 communicate with the room 52 at the lowest position of the inclined surface 125 constituting the bottom surface of the room 52.
上部筐体121及び下部筐体124で囲まれた気密空間の外界との通気は、この通気孔50の多孔質膜54、部屋52、貫通孔51及び不織布フィルター55を介してのみ行われ、この通気により測定空間の内外気圧差が解消される。
ここでは、通気孔50を介して測定空間の内外気圧差が迅速に解消できるように、多孔質膜54の面積を下部筐体124の面積の凡そ10%に設定している。
Ventilation with the outside of the airtight space surrounded by the upper casing 121 and the lower casing 124 is performed only through the porous membrane 54, the chamber 52, the through hole 51, and the nonwoven fabric filter 55 of the vent hole 50. The pressure difference between the inside and outside of the measurement space is eliminated by ventilation.
Here, the area of the porous membrane 54 is set to approximately 10% of the area of the lower housing 124 so that the internal and external pressure differences in the measurement space can be quickly eliminated via the vent hole 50.
多孔質膜54には、例えば、1cm2当たり数億個の微細孔を有する四フッ化エチレン樹脂から成る膜を使用することができる。この膜は、防水性、防塵性、通気性を兼ね備えている。
多孔質膜54の微細孔の孔径は数μm以下であるが、多孔質膜54の面積を広く設定しているため、多孔質膜54全体での単位時間当たりの通気量は可なり多い。
また、不織布フィルター55は、オイルミストを捕捉するために配置している。この不織布フィルター55は、合成樹脂繊維、炭素繊維、ガラス繊維、金属繊維、あるいは、セラミック繊維等をバインダーで結合して布状に成形したものであり、多孔質膜54に比べて、数倍から数十倍以上の空隙を有している。
As the porous membrane 54, for example, a membrane made of a tetrafluoroethylene resin having several hundred million micropores per 1 cm 2 can be used. This film has waterproofness, dustproofness and air permeability.
The pore diameter of the micropores of the porous membrane 54 is several μm or less. However, since the area of the porous membrane 54 is set wide, the air flow rate per unit time in the entire porous membrane 54 is very large.
Moreover, the nonwoven fabric filter 55 is arrange | positioned in order to capture | acquire oil mist. This non-woven filter 55 is formed by combining synthetic resin fibers, carbon fibers, glass fibers, metal fibers, ceramic fibers or the like with a binder and forming into a cloth shape. It has several tens of times more voids.
貫通孔51の断面積は、不織布フィルター55で塞いだ状態での単位時間当たりの通気量が、多孔質膜54の単位時間当たりの通気量を下回らない広さに設定している。
ただ、この防水・防塵秤をオイルミストが浮遊する環境下で長時間使用すると、オイルミストが不織布フィルター55に付着して不織布フィルター55が目詰まりし、不織布フィルター55の通気量が低下する虞がある。
このような場合は、不織布フィルター55を剥がして、新しいものと貼り替える。不織布フィルター55は、下部筐体124の外側に貼り付けられているため、貼り替えを簡単に行うことができる。
The cross-sectional area of the through hole 51 is set such that the air flow rate per unit time in a state where the through hole 51 is closed with the nonwoven fabric filter 55 does not fall below the air flow rate per unit time of the porous membrane 54.
However, if this waterproof / dustproof balance is used in an environment where the oil mist floats for a long time, the oil mist may adhere to the nonwoven fabric filter 55 and the nonwoven fabric filter 55 may be clogged, resulting in a decrease in the air flow rate of the nonwoven fabric filter 55. is there.
In such a case, the nonwoven fabric filter 55 is peeled off and is replaced with a new one. Since the nonwoven fabric filter 55 is affixed to the outside of the lower housing 124, it can be easily replaced.
また、図6(a)の断面図、図6(b)の平面図に示すように、下部筐体124の外側の貫通孔51を囲む位置に、不織布フィルター55を交換可能に支持する支持部材56を配置して、不織布フィルター55がオイルミストで目詰まりしたときに、その不織布フィルター55を支持部材56から引き出し、新しいものと交換するようにしても良い。図6(b)の矢印は、不織布フィルター55を支持部材56に装着するときの挿入方向を示している。 Further, as shown in the cross-sectional view of FIG. 6A and the plan view of FIG. 6B, a support member that supports the nonwoven fabric filter 55 in a replaceable manner at a position surrounding the through hole 51 outside the lower housing 124. When the nonwoven fabric filter 55 is clogged with oil mist, the nonwoven fabric filter 55 may be pulled out of the support member 56 and replaced with a new one. The arrow in FIG. 6B indicates the insertion direction when the nonwoven fabric filter 55 is attached to the support member 56.
この防水・防塵秤の通気孔50は、下部筐体124の下側に口を開けているため、秤量皿10に振り掛けた水が直接入り込む虞が無い。また、この水が筐体を伝って下部筐体124の下側に回り込み、或いは、秤を置いた床面等で跳ねた水が下部筐体124の下側に達することがあったとしても、通気孔50の多孔質膜54は、筐体の外側に面していないため、水に触れ難い。それ故、前述するように、多孔質膜54の面積を、単位時間当たりの通気量が十分得られるように、広く設定することができる。
また、貫通孔51を通って部屋52に浸入する水が有ったとしても、部屋52の底部が傾斜し、底部の最も低い位置に貫通孔51が設けられているため、浸入した水は、貫通孔51から自動的に排水される。
The vent hole 50 of the waterproof / dustproof balance has an opening at the lower side of the lower housing 124, so there is no possibility that water sprinkled on the weighing pan 10 will directly enter. Further, even if this water travels down the lower casing 124 through the casing, or the water splashed on the floor or the like on which the scale is placed may reach the lower section of the lower casing 124, Since the porous membrane 54 of the ventilation hole 50 does not face the outside of the casing, it is difficult to touch water. Therefore, as described above, the area of the porous membrane 54 can be set widely so that a sufficient amount of ventilation per unit time can be obtained.
Further, even if there is water that enters the room 52 through the through hole 51, the bottom of the room 52 is inclined and the through hole 51 is provided at the lowest position of the bottom. The water is automatically drained from the through hole 51.
また、浮遊するオイルミストや微細な粉体は、不織布フィルター55で捕捉されるので、多孔質膜54がオイルミストや微細な粉体により目詰まりを起す虞も無い。
不織布フィルター55は、オイルミストのために目詰まりを起しても、下部筐体124の外側に取り付けられているので、簡単な操作で新しいものと交換することができる。
そのため、この防水・防塵秤は、オイルミストが発生する切削加工現場や厨房等でも、安定して高精度の計量を行うことができる。
なお、ここで示した通気孔の構造や形状、設置位置、また、多孔質膜や不織布フィルターの素材等は、すべて一例であって、本発明は、それに限定されない。
Further, since the floating oil mist and fine powder are captured by the nonwoven fabric filter 55, there is no possibility that the porous film 54 is clogged by the oil mist and fine powder.
Even if the nonwoven fabric filter 55 is clogged due to oil mist, the nonwoven fabric filter 55 is attached to the outside of the lower casing 124, so that it can be replaced with a new one with a simple operation.
Therefore, this waterproof / dustproof balance can stably measure with high accuracy even at a cutting work site or a kitchen where oil mist is generated.
It should be noted that the structure and shape of the air holes, the installation position, the material of the porous membrane and the nonwoven fabric filter, etc. shown here are all examples, and the present invention is not limited thereto.
本発明の秤は、水やホコリを浴び、また、オイルミストや微細な粉体が浮遊する環境でも高精度の計量が可能であり、食品加工や水産物の製造現場、切削加工現場、厨房、化学品や医薬品の生産現場、電子部品などの化学処理現場、建築現場など、幅広い分野で利用することができる。 The scale of the present invention is capable of high-precision weighing even in an environment where it is exposed to water or dust, or where oil mist or fine powder is floating, and is used in food processing, marine product manufacturing, cutting, kitchen, chemical It can be used in a wide range of fields, such as production sites for goods and pharmaceuticals, chemical processing sites for electronic components, and construction sites.
10 秤量皿
11 皿受板
17 電池ボックス
18 電子表示板
19 回路基板
20 支持脚
40 計量ブロック
48 ダイアフラム
50 通気孔
51 貫通孔
52 部屋
53 内壁
54 多孔質膜
55 不織布フィルター
56 支持部材
121 上部筐体
122 開口
123 表示窓
124 下部筐体
125 傾斜面
DESCRIPTION OF SYMBOLS 10 Weighing pan 11 Plate receiving plate 17 Battery box 18 Electronic display board 19 Circuit board 20 Support leg 40 Weighing block 48 Diaphragm 50 Vent hole 51 Through hole 52 Room 53 Inner wall 54 Porous membrane 55 Nonwoven fabric filter 56 Support member 121 Upper housing 122 Opening 123 Display window 124 Lower housing 125 Inclined surface
Claims (2)
筐体の底部の一部を内側に窪ませて形成した傾斜面と、
前記傾斜面の最も低い位置で該傾斜面を貫通する一または複数個の貫通孔と、
前記貫通孔に連なる部屋を筐体内の前記傾斜面上に画成するために前記筐体の内側に形成された内壁と、
前記部屋を取り囲む前記内壁の前記傾斜面と反対の側を塞ぐ多孔質膜と、
前記貫通孔を前記底部の外側から塞ぐ不織布フィルターと、
を備え、
前記貫通孔の断面積が、前記多孔質膜の面積よりも狭く、且つ、該貫通孔を前記不織布フィルターで塞いだ状態での単位時間当たりの通気量が、前記多孔質膜の単位時間当たりの通気量を下回らない広さに設定されていることを特徴とする秤。 A scale with waterproof and dustproof functions,
An inclined surface formed by recessing a part of the bottom of the housing inward;
One or a plurality of through holes penetrating the inclined surface at the lowest position of the inclined surface ;
An inner wall formed on the inner side of the casing to define a room connected to the through hole on the inclined surface in the casing;
A porous membrane that covers the opposite side of the inclined surface of the inner wall surrounding the room;
A non-woven filter that closes the through hole from the outside of the bottom; and
Equipped with a,
The cross-sectional area of the through-hole is smaller than the area of the porous membrane, and the air flow rate per unit time in a state where the through-hole is closed with the nonwoven fabric filter is the per-unit time of the porous membrane. A scale characterized by being set to a size that does not fall below the air flow rate .
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JP3233096B2 (en) * | 1998-03-13 | 2001-11-26 | 株式会社寺岡精工 | Waterproof electronic balance |
JP4204947B2 (en) * | 2003-11-06 | 2009-01-07 | 株式会社エー・アンド・デイ | Scale |
JP2007104616A (en) * | 2005-09-30 | 2007-04-19 | Asia Optical Industries Ltd | Waterproof earphone |
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