JPS58122148A - Method and device for measuring content of clay in molding sand - Google Patents

Abstract

PURPOSE:To measure the content of clay in molding sand mechanically, automatically and continuously with high accuracy by supplying electric current through the molding sand between the electrodes inserted into the molding sand under moving and detecting the electric resistance value at that time. CONSTITUTION:The lower parts of electrodes 3, 3 mounted with electric insulators 4, 4 to a supporting member 5 mounted to a stationary frame 6 are dipped into molding sand which moves on a belt 1 of a belt conveyor while the sand is regulated with guiding members 2, 2. Voltage is applied between the electrodes 4 and 4 to run electric current through the molding sand. The total electric resistance value R of the molding sand when the current flows is measured; at the same time, the temp. and moisture of the molding sand are measured with a tamp. sensor 11 and a moisture measuring sensor (not shown). From these measured values, the electric resistance relating to the content of clay is determined by subtracting resistance factors such as temp., moisture, intrinsic values in the molding sand and the like from the above-mentioned value R by an operator (not shown), and further the content of clay is calculated.

Description

【発明の詳細な説明】 本発明は＃御砂の粘土分の含有型を測定する方法および
その装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for measuring the type of clay content in sand.

鋳型を型ばらしして得た回収砂を鋳物砂として再使用す
る場合、該回収砂は溶−の熱等によってベントナイト等
の粘結剤が焼失したり水分が魚発減少したりするうえ中
子境損砂等が混入するため、一般番と回収砂にはベント
ナイト等の粘結剤や水を麻加補給する必要があるが、−
書砂粘土分の含會濾を遍−−こして＃１度を尚く直接測
定できる方法８よび装置がいまだ開発されて（１ない。When reclaimed sand obtained by disassembling a mold is reused as foundry sand, the binder such as bentonite in the reclaimed sand is burned away by the heat of the melt, the water content is reduced, and the core is damaged. Because waste sand and other substances are mixed in, it is necessary to supplement general sand and recovered sand with a binder such as bentonite and water.
A method and apparatus that can directly measure #1 degree by filtering the sand clay content have not yet been developed.

そのため、−物砂粘土分の含有型を一一的―自ａＧ＋こ
して精度を扁く測定できる方法およびその装置の出現が
業界から要請されていた。Therefore, there has been a demand from the industry for a method and device that can uniformly measure the content of sand and clay content with high accuracy.

本発明は上記の憂情曇ζ艦みなされたもので、その目的
は、鋳物砂中を流れる電流の′ｗＬ気抵抗抵抗鋳物砂の
組成１こよって変化する特性に書目して鋳物砂粘土分合
１’鳳を測定するようにした方法わよびその装置を提供
するにある。以ド、本発明の実施−曇こついて図面に基
づき詳細６４説明「る。The present invention is based on the above-mentioned concerns, and its purpose is to improve the resistance of the current flowing through the foundry sand and the composition of the foundry sand. The object of the present invention is to provide a method and an apparatus for measuring the amount of heat. Hereinafter, the implementation of the present invention will be described in detail based on the drawings.

第１図および４２図は＃１妙の粘土分の含有型を測定す
る装置の一実施例を示すが、（１）は前後方同番こ延び
る鋳物砂鍾送用ベルトコンベヤのベルトで、該ベルト（
１）上の左右画一位置には下４７＃ｌがベルト（１）と
接触するガイド部材（２）　（２）が固定配設されてい
る。そして、該ガイド部材（２）（２）閣内には、鋼、
不通綱等の４°慰材料で製作した矩形板状の電極板（３
）　（３）が所要の間隔をおいて対向するととも昏こ瓦
い番こ平行し、かつ、ベルト（１）の長手方向に慣向す
るとともにベルト（１）と適当な１−崗を８いて配設さ
れており、該電極板（３）（３）は電気絶縁体（４）　
（４）を介して支持部材（５）に装着さｎている。該支
持部材（５）は固定フレーム（６）に設けたブラケット
（７）−こ支持ビン（８）を介して垂直回鋤可能曇ζ支
持され、かつ、ブラケット（７）にｍ＃ｔ、たド回＄−
節ボルト（９）をもって傾ＩＩｂ調整旬−とされており
、したがって電−板（３）（３）等は上下６ζ−整で＄
るよう曇こなっている。また、前記電極板（３）　（３
）の各外側向には電気ヒータ（１０）が装着されていて
ＩＩＥ極板（３）　（３）を適当ｄａ！度ｊζ加熱する
ようＶこなっている。（１１）はａ１度補正用の温度セ
ンサで、電極板（３）　（３）の中間に位置して支持感
材（５）ｌと固着されている。Figures 1 and 42 show an example of a device for measuring the clay content of #1 clay. belt(
1) A guide member (2) (2) whose lower portion 47 #l contacts the belt (1) is fixedly disposed at the same position on the upper left and right sides. The guide member (2) (2) has steel,
A rectangular plate-shaped electrode plate (3
) When (3) face each other at the required interval, they are parallel to each other, and are oriented in the longitudinal direction of the belt (1), and have an appropriate distance between them and the belt (1). The electrode plates (3) (3) are electrically insulators (4)
It is attached to the support member (5) via (4). The support member (5) is vertically rotatably supported via a bracket (7) and a support bin (8) provided on the fixed frame (6), and m#t is attached to the bracket (7). Do times $-
The joint bolt (9) is used to adjust the inclination IIb, so the electrical plates (3) (3) etc. can be adjusted up and down by 6ζ.
It's getting cloudy. Moreover, the electrode plate (3) (3
) is equipped with an electric heater (10) on each outer side of the IIE electrode plate (3). V is arranged so that it heats up by a degree jζ. Reference numeral (11) denotes a temperature sensor for a1 degree correction, which is located between the electrode plates (3) (3) and is fixed to the support sensitive material (5)l.

次壷ζ第３図φと示す電気回路図１４ついて説明する。Next, the electric circuit diagram 14 shown as ζ in FIG. 3 will be explained.

（３１）は端子（３２）　４こ供給さｎた交流の電圧を
トげるトランス、（３３）は可変抵抗器、（３４）は整
流−１（３５）は温度補正回ＩＩおよび薔櫨弓変抵抗器
を収納した制御！！直、（３６）はトランス（３１）　
、抵抗−（３３）等と＊極板（３）　（３）とを結線す
る端子、（３７）は制御装置ｔ（３５）と温度センナ（
１１）とを結縁する端子、（３８）は水分補正回路を収
納した制御装置、（３９）は＠御装置（３８）と水分測
定センサ（図示せず）とを結縁する端子、（４０）は制
御表！ｌ（３ｇ）と粘土分合＃鳳記録計とを結縁する端
子である。(31) is a transformer that increases the voltage of the alternating current supplied to the terminal (32), (33) is a variable resistor, (34) is a rectifier-1 (35) is a temperature correction circuit II and a rose bow Control that houses a variable resistor! ! Straight, (36) is transformer (31)
, the terminal for connecting the resistor (33), etc. and the electrode plate (3) (3), (37) is the terminal for connecting the control device t (35) and the temperature sensor (
11), (38) is a control device containing a moisture correction circuit, (39) is a terminal that connects @control device (38) and a moisture measurement sensor (not shown), (40) is a terminal that connects Control table! This is a terminal that connects the 1 (3 g) and the clay mixing recorder.

このように構成されたものは、粘土分の含■濾を測定す
べｈ鋳物砂Ｓを図示しないホッパから切出し、図示しな
いスクレパによりその上向を所定レベルに均し、ガイド
部材（２）　（２）　＋ｃより姦内するととも番こその
上面レベルを維持しながらベルト（１）をもって搬送す
ると、当該緩Ｗ砂Ｓは移動して電極板（３）　（３）の
下部を侵入させる。そこで、トランス（３１）で１＆通
・こドけられるとともにＩＪ変抵抗器（３３）を通した
電圧を前記電極板（３）　にｄ）開会と印加すると、電
極板（３）　（３）間合ζは鋳物砂Ｓを介して電流が隠
れるが、この４流の電気抵抗は鋳物砂の温度、水分量わ
よび粘土分食有量の影榔を受は良化する。With this structure, the molding sand S is cut out from a hopper (not shown), and its upper surface is leveled to a predetermined level with a scraper (not shown), and the clay content is measured. ) When the loose W sand S is conveyed by the belt (1) while maintaining the upper surface level of the sand from +c, the loose W sand S moves and invades the lower part of the electrode plate (3) (3). Therefore, when a voltage is applied to the electrode plate (3) through the IJ transformer (33) while being turned on by the transformer (31), the voltage between the electrode plates (3) and (3) is applied to the electrode plate (3). In the case of total ζ, the current is hidden through the foundry sand S, but the electrical resistance of these four currents is improved by the influence of the foundry sand's temperature, moisture content, and clay eclipse content.

なわ、４極板（３）　（３）間を流れる’ＩｉＥ流の電
気抵抗は、＃備砂の温度、水分量、粘土分含自°朧およ
び砂粒子の固着書の４櫨頬がある。The electrical resistance of the IiE flow flowing between the rope and the quadrupole plate (3) (3) has four characteristics: the temperature of the sand, the moisture content, the clay content, and the adhesion of the sand particles.

ところで、鋳物砂Ｓの電気抵抗は第４図〜第６図−ζ小
すよう曇ζ、＃備砂の温度、水分ｍおよび粘土分ｔｅｍ
のそれぞれと一定の相関関係がある。By the way, the electrical resistance of foundry sand S is shown in Figures 4 to 6 -
There is a certain correlation with each of them.

そして、鋳物砂Ｓの全電気抵抗値をＲ％鋳物砂Ｓの１１
こ関する電気抵抗−をＲ１，鋳物砂Ｓの水分量に関する
電気抵抗−をＲａ、鋳物砂Ｓの粘土分含會菖ｌこ関する
電気抵抗−を１３、鋳物砂Ｓのその他のＩＭ因に関する
電気抵抗値をＲａ、鋳物砂Ｓの温度Ｊｋ１’、＃４Ｆ＃
砂Ｓの水分量をＭ、ｆ１１＠砂Ｓの粘土分含有ＪｌｌＢ
％そｎぞｎｃｏ定数をに１、Ｋ２、Ｋｓ、トスると、次
のＭ係式が成立することが、実験の結果判明しＲｏ Ｒ＝Ｋｌ十Ｋｇ＋Ｒｓ十Ｒ４、Ｒｔ＝ＫＶ’ム゛、Ｒ２
＝に２．／ｒＡ、Ｋｓ　＝　Ｋａ／Ｂ　、　Ｒ４＝一定
、したがって、粘土分食Ｗ童に−する電気抵抗−に３は
全″ｄｌｔ気抵抗−ｋから一反に関する電気抵抗−Ｒ１
、水分量に−する電気抵抗−Ｒ２およびその他の要因に
関する電気抵抗−に４を引算して得ることができる。Then, the total electrical resistance value of the foundry sand S is R%11 of the foundry sand S.
The electrical resistance related to this is R1, the electrical resistance related to the moisture content of the foundry sand S is Ra, the electrical resistance related to the clay content of the foundry sand S is 13, the electrical resistance related to other IM factors of the foundry sand S The value is Ra, the temperature of molding sand S is Jk1', #4F#
Moisture content of sand S is M, f11@ clay content of sand S JllB
As a result of experiments, it was found that when the %sonzonco constants are tossed to 1, K2, Ks, the following M equation holds true: Ro R = Kl + Kg + Rs + R4, Rt = KV' R2
= 2. /rA, Ks = Ka/B, R4 = constant, therefore, the electric resistance for the clay fraction W child - 3 is the total dlt resistance - the electric resistance for one roll from k - R1
, can be obtained by subtracting 4 from the electrical resistance relative to the water content - the electrical resistance relative to R2 and other factors.

なお、第４ｖｉＡ〜皐６図に示すグラフは、横１００１
１１の電極板２枚を１００−の間隔をお伽対向させて配
直し、これら、を酸切砂内に５０■伸人して、ＩＩＥ極
板間に電気を流し、そのときの鋳物砂の温度、水分量お
よび粘土分合［鰍のそれぞれが、その電流の電気抵抗番
と及ぼす彰＃−４ついて夷馴的曇こ測定しｔ二結果を片
対数１櫨で衣ボしたものである。そして、′ｓ４図会こ
おいてＡ、ｋｌ線はさ舊水分鳳がそｎぞれ２．０％、３
．０％のときである。また、第５図にわいてａｔ　ｂｌ
Ｃ，ｄｌｉＡは粘土分食有量がそれぞｔＬ７．４％、８
．８％、１０．７％、１４，０％のときである。さら６
ζ、第６図において４１β線は會有水分城がそれぞれ２
．０％、３．０％のときである。Note that the graphs shown in Figures 4viA to 6 are horizontally 1001
Arrange the two electrode plates of No. 11 so that they face each other with a spacing of 100 -, stretch them in acid cut sand for 50 cm, and apply electricity between the IIE electrode plates to determine the temperature of the foundry sand at that time. , water content and clay content [Each fish is measured for its electric current resistance number and the effect of light #-4, and the results are calculated using a semi-logarithm scale. And, in 's4 Zue, the A and kl lines are 2.0% and 3, respectively.
．． This is when it is 0%. Also, in Figure 5, at bl
C and dliA have clay eclipse content of tL of 7.4% and 8, respectively.
．． 8%, 10.7%, and 14.0%. Sara 6
ζ, the 41β line in Figure 6 has a water force of 2, respectively.
．． 0% and 3.0%.

よって、鋳物砂Ｓを介し１１１Ｅ極板（３）　（３）間
に電流を流して鋳物砂Ｓの粘土分の含自濾を測定する６
とは、電−飯（３）　（３）聞６ζ流れる電流をｍ御装
瀘（３５）に尋人して前記電気抵抗＠Ｒを検出するとと
も・こ、端子（３７）を介して制＃装置１ｌ（３５）　
ｆζ入力した一部センサ（１１）の４電信号によって電
気抵抗−Ｒからａｉｌ記螺礪抵抗−Ｒ１を引算して鋳物
砂Ｓの温度影響の分を補正し、続いて、温度影響の分を
補正した４ｔｉｔＪｋ制ＡＩ装置（３８）に導入すると
ともｂこ、端子（３９）を介し１１１１＃装置（３８）
に入力した水分ｊ１６１定センｆ（図示せず）＋７）Ｉ
Ｈ２Ｃ（ｍ号＋４　ヨッテサ６　＋Ｃｌｉｄ紀１１１ｃ
気銘抗繰に２を引算して鋳物砂Ｓの水分盪影−の分を補
正し、（これから前記電気抵抗＠Ｒａが求ま、６）こう
して−正した電流を端子（４０）を介して記−ｊ［（図
示せず）に人力し、該記録計では前記“喝Ａ体抗鎮Ｒ４
を引算した状態で記録するようにす、れは、崎蜀妙Ｓの
粘土分の含有量を得ることがで、さる。Therefore, by passing a current between the 111E electrode plates (3) (3) through the foundry sand S, the clay content of the foundry sand S is measured.
This means that when the electric current (3) (3) and 6ζ flowing through the electric current (35) is detected and the electrical resistance @R is detected, it is controlled via the terminal (37). Equipment 1l (35)
The temperature influence of the foundry sand S is corrected by subtracting the ail-recorded screw resistance -R1 from the electric resistance -R using the 4 electric signals of some sensors (11) input as fζ, and then the temperature influence is corrected. When introduced into the corrected 4titJk AI device (38), the 1111# device (38) is connected via the terminal (39).
Moisture input j161 constant sen f (not shown) + 7) I
H2C (m+4 Yottesa 6 + Clid 111c
The moisture content of the foundry sand S is corrected by repeatedly subtracting 2, and (from this, the electrical resistance @Ra is determined, 6) The corrected current is passed through the terminal (40). The recorder records the above-mentioned "A body resistance R4"
By subtracting the amount and recording it, we can obtain the clay content of Sakishu Myo S.

ｉ４ね、ｌ記水分ｍｍ定噌ンサ（図示せず）としＣは特
開昭５５−１４１６６９号公権で開示されるようなもの
がめる。また、　＊＊板（３）は電気ヒータ（１０）　
＋こよりｈｌ熱されるため、鋳物砂の粘土分が″電極板
（３）ｈｃ付肴することはなり、シたがって電極板（３
）の一度がわるくなることはない。i4, l is a moisture meter (not shown), and C is the one disclosed in Japanese Unexamined Patent Publication No. 55-141669. Also, **Plate (3) is an electric heater (10)
Since the clay content of the foundry sand is heated from + hl, the clay content of the foundry sand will not be added to the electrode plate (3).
) never goes bad.

なお、上鮎の実１ＩＡ−では電−板（３）は平板である
か、これに議定するもので６１なく、棒体等でもよい。In addition, in the upper Ayu no Mi 1IA-, the electric plate (3) is not limited to a flat plate, but may be a rod or the like.

また、＃ｍ−の粘土分は活性粘土分と不活性粘土分とで
＃／Ｉ或されている。そして、オ舊水分鳳２．０％、温
度３０℃の一一妙の粘土分が、電−関を隠れる電流の電
ＩＫ抵抗６ζ及ぼす影響６とついて夾−凶暴こ一定し、
その食Ｈ慮を６分率で示しかつ片対数目−で表わすと箪
７図のようになる。図中、イ繍は粘土分の全會舊朧、口
線は活性粘土分の會舊謔、バーは不活性粘土分の含有量
をそれぞれボす。グラフから次のことがわかる。活性粘
土分はｍ％低抵抗影響を及ぼさない。したがって粘土分
の会食音源と、活性粘土分のｆ！を音源を一定すれば不
清吐粘土分の含有量が判る。Further, the clay content of #m- is #/I between active clay content and inactive clay content. And, the influence of the clay content of 2.0% water and a temperature of 30℃ on the electric IK resistance 6ζ of the current that hides the electric wire is constant.
If we express the eclipse as a 6% ratio and as a semi-logarithm, it becomes as shown in Figure 7. In the figure, the lines indicate the total content of clay, the open lines indicate the content of active clay, and the bars indicate the content of inactive clay. The following can be seen from the graph. Activated clay content has no effect on m% lower resistance. Therefore, the clay part of the sound source and the active clay part of f! If we keep the sound source constant, we can find out the content of fuseitu clay.

本開明は以上のよう６と構成したから、鋳物砂に電気を
流し、そのときの電気抵抗−を検出するだけで、−物砂
粘土分のｉ！を有量を一定することかで都、シたがって
＃備砂粘土分の含有量を自５ｆ−Ｊ・機械的にして連続
的に測定できるなどの優れた効果を夷する。Since the present invention is configured as described above, all you have to do is apply electricity to the foundry sand and detect the electrical resistance at that time. By keeping the amount constant, it has excellent effects such as being able to mechanically and continuously measure the content of clay.

【図面の簡単な説明】[Brief explanation of drawings]

第１＃Ａは一つの実施例の一部切欠正面図、第２図は４
１図の一部切欠正面図、１１３図は本発明の装置を作動
するための電気副路図、ｊｉ４ｍｌは鋳物砂の電極間抵
抗−と鋳物砂温度の関係を表示するグラフ、第５図は鋳
物砂の電極間抵抗値と鋳物砂ｉｔ育水分鳳の関係を表示
するグラフ、ｍ１ｌｌｉおよびｓ７図は鋳物砂の電極間
抵抗値と鋳物砂粘土分会Ｎ量の関係を表示するグラフで
ある。 亨１　図 斗４図 警５図 鋳物η柱上分令治）（％） ０　　　１　　　　２　　　３４５６８１０１５２０３
０００／を極鳩才す批４直（ｋ立）No. 1 #A is a partially cutaway front view of one embodiment, and No. 2 is a partially cutaway front view of one embodiment.
1 is a partially cutaway front view of Fig. 1, Fig. 113 is a sub-electrical circuit diagram for operating the device of the present invention, ji4ml is a graph displaying the relationship between the interelectrode resistance of the foundry sand and the temperature of the foundry sand, and Fig. 5 is Graphs showing the relationship between the inter-electrode resistance value of foundry sand and the foundry sand hydration ratio, M1lli and S7 are graphs showing the relationship between the inter-electrode resistance value of foundry sand and the foundry sand clay fraction N amount. Toru 1 Zuto 4 Zuken 5 Casting η Pillar Kamibu Reiji) (%) 0 1 2 345681015203
4 shifts (k standing) to criticize 000/

Claims (1)

【特許請求の範囲】 １、所定の間隔を８いて対向する電極を移鋤中の一榔砂
円に挿入し、前記対向する電極に電圧を印加して該電極
の間に前記鋳物砂を介して電流を流し、その時の電気抵
抗の変化を利用して＃１砂の粘土分の含育量を固定する
ことを待倣とする鋳物砂粘土分含有腫の測定方法。 ２、−ｗ砂鑵送装慮の上方に、所定の間隔をおいて対向
する電極を、前１ｇ８鐵送装置と所要の間隔をおいて固
定配設し、該電極会こ電圧を印加＃Ｊ浦としたことを特
徴とする鋳物砂粘土分合ａｍの測定装置つ[Claims] 1. Inserting electrodes facing each other at a predetermined interval of 8 to a sand circle being transferred, and applying a voltage to the facing electrodes to pass the foundry sand between the electrodes. A method for measuring clay content in foundry sand, in which a current is applied to the sand and the clay content of #1 sand is fixed using the change in electrical resistance at that time. 2. Above the -w sand iron conveying device, an electrode facing the former 1g8 iron conveying device at a predetermined distance is fixedly arranged, and a voltage is applied to the electrode #J. A measuring device for the foundry sand and clay content am, which is characterized by the fact that