JP2008074592A - Constant quantity feeder for poor flowability powder - Google Patents

Constant quantity feeder for poor flowability powder Download PDF

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JP2008074592A
JP2008074592A JP2006258516A JP2006258516A JP2008074592A JP 2008074592 A JP2008074592 A JP 2008074592A JP 2006258516 A JP2006258516 A JP 2006258516A JP 2006258516 A JP2006258516 A JP 2006258516A JP 2008074592 A JP2008074592 A JP 2008074592A
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powder
rod
amount
cut
quantitatively
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JP4821027B2 (en
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Susumu Minagawa
進 皆川
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Japan Atomic Energy Agency
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to presses
    • B30B15/302—Feeding material in particulate or plastic state to moulding presses
    • B30B15/304—Feeding material in particulate or plastic state to moulding presses by using feed frames or shoes with relative movement with regard to the mould or moulds

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Abstract

<P>PROBLEM TO BE SOLVED: To smoothly convey a poor flowability powder and surely supply/charge it to a next step such as a molding die of a powder compression molding device by accurately dispensing a required constant amount of powder. <P>SOLUTION: This constant quantity feeder for the poor flowability powder comprises a powder supply part 10 for conveying a powder, a powder dispensing part 12 for dispensing a constant quantity of the powder conveyed, and a preliminary pressurizing part 14. The powder supply part has a powder box 24 and a sieve mesh 26 on a powder conveying trough 20, and conveys the poor flowability powder after being loosened off by the sieve mesh vibrating the coagulated poor flowability powder. The powder dispensing part controls the position of a rod 32 in a cylinder 30 by a pulse motor 36, regulates the amount of the powder contained in a cylinder hole 34, regulates the specified amount of the powder contained in the cylinder hole 34, and dispenses a specified amount of powder by a scraper mechanism. The preliminary pressing part conveys the dispensed specified amount of powder to which a light load is added and brought into a solidified state. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

本発明は、造粒処理が施されていない流動性不良粉末を円滑に搬送でき、ばらつきの少ない定量供給を実現できる粉末定量供給装置に関するものである。この技術は、特に流動性の悪い粉末を用いて成型するプロセスを有する分野で有用である。   The present invention relates to a powder quantitative supply device that can smoothly convey a poorly fluid powder that has not been subjected to granulation treatment and can realize a quantitative supply with little variation. This technique is particularly useful in fields that have a process of molding using poorly flowable powders.

粉末を所定形状のペレットに圧縮成型する装置については、既に様々な方式のものが製品化されている。例えば特許文献１には、粉末圧縮成型方法とその成型機が開示されている。これは、通常同様、成型ダイスと下杵と上杵などから構成される。成型ダイスのダイス孔に粉末が充填され、粉末のすり切りを行うことで、１個のペレットを成型するのに必要な計量が行われ、定量化される。成型ダイス内の粉末に対して、昇降する下杵と上杵が粉末を圧縮成型する。成型されたペレットは、下杵によって成型ダイスの外部に押し上げられ、排出される。   Various devices for compressing and molding powder into pellets of a predetermined shape have already been commercialized. For example, Patent Document 1 discloses a powder compression molding method and a molding machine therefor. As usual, this is composed of a molding die, a lower punch, an upper punch and the like. The powder is filled in the die hole of the molding die, and the powder is ground, so that the measurement necessary for molding one pellet is performed and quantified. For the powder in the molding die, the lower and upper halves that move up and down compress the powder. The molded pellets are pushed out of the molding die by the lower punch and discharged.

これら従来の圧縮成型機では、造粒などの処理を行って流動性を向上させた粉末を使用する。しかし、造粒処理が施されていない粉末は流動性が悪く、そのような流動性不良粉末は、成型ダイスへの定量供給が困難であり、そのままでは既存の圧縮成型機では使用できない。   In these conventional compression molding machines, a powder whose flowability is improved by a process such as granulation is used. However, powder that has not been granulated has poor flowability, and such poorly flowable powder is difficult to be quantitatively supplied to a molding die and cannot be used in an existing compression molding machine as it is.

ところで、将来の高速増殖炉燃料用原料粉末は、放射線強度、発熱率が大幅に増加し、粉末の流動性調整が困難になることが予想される。そこで、粉末の流動性調整が不要になれば、その意義は極めて大きい。しかし、ダイス孔へ流動性不良粉末を定量充填できる技術は、未だ開発されていない。   By the way, it is expected that the raw material powder for the fast breeder reactor fuel in the future will greatly increase the radiation intensity and the heat generation rate and make it difficult to adjust the fluidity of the powder. Therefore, if it is not necessary to adjust the fluidity of the powder, its significance is extremely large. However, a technique that can quantitatively fill a die hole with poorly flowable powder has not yet been developed.

そればかりではなく、造粒粉末の搬送には断面Ｕ型のトラフをもつ直進フィーダが用いられるが、造粒処理が施されていない流動性不良粉末は、そのような一般的な直進フィーダでは円滑に搬送できない問題もある。
特開平１０−１９３１９３号公報 In addition, a straight-feeder having a U-shaped trough is used to convey the granulated powder. However, poorly flowable powder that has not been granulated is smooth in such a general straight-feeder. There is also a problem that can not be transported.
JP-A-10-193193

本発明が解決しようとする課題は、流動性不良粉末を円滑に搬送でき、必要とする一定量を正確に切り出して、粉末圧縮成型装置の成型ダイスなどの次工程に確実に供給・充填できるようにすることである。   The problem to be solved by the present invention is that the poorly flowable powder can be smoothly conveyed, the required amount can be accurately cut out, and can be reliably supplied and filled in the next process such as a molding die of a powder compression molding apparatus. Is to do.

本発明は、流動性不良粉末を搬送する粉末供給部と、該粉末供給部から搬送されてきた粉末を定量切り出しする粉末切り出し部と、該粉末切り出し部の後段に位置する予備加圧部を具備している流動性不良粉末の定量供給装置である。なお、流動性不良粉末とは、造粒処理などが施されていない流動性指数の低い粉末をいう。   The present invention includes a powder supply unit that conveys poorly flowable powder, a powder cutout unit that quantitatively cuts out the powder that has been conveyed from the powder supply unit, and a pre-pressurization unit that is located after the powder cutout unit. This is a quantitative supply device for poorly flowable powder. The poor fluidity powder is a powder having a low fluidity index that has not been subjected to granulation.

ここで前記粉末供給部は、断面Ｕ型の粉末搬送トラフを有する直線フィーダと、前記粉末搬送トラフの一端部の上方に取り付けた流動性不良粉末を受ける粉箱と、該粉箱の下面にて前記トラフの底面に対して平行に間隔をおいて設置した篩網とを備え、粉箱に投入され凝集している流動性不良粉末を振動する篩網で解きほぐし直線フィーダにより粉末搬送トラフで搬送する構造である。また、前記粉末切り出し部は、粉末を収容するように立設されている筒体と、該筒体内で軸方向に摺動自在のロッドと、該ロッドの上面位置を制御するロッド駆動手段と、筒体上面の粉末を掻き払うスクレーパ機構と、筒孔に収容されている粉末の重量を測定する粉末重量測定手段を備え、筒孔に収容される粉末量をロッド上面位置で制御し、該ロッドの上昇で粉末を払い出しスクレーパ機構により定量切り出す構造である。更に、前記予備加圧部は、粉末収容筒と、該粉末収容筒内に嵌入する加圧用ロッドを備え、定量切り出された粉末に軽荷重を加えて固めた状態で搬送可能にする構造である。   Here, the powder supply unit includes a linear feeder having a U-shaped powder conveying trough, a powder box that receives poorly flowable powder attached above one end of the powder conveying trough, and a lower surface of the powder box. And a sieve mesh placed parallel to the bottom surface of the trough, and disintegrating the fluidity-poor powder that has been put in the powder box and agglomerated with a vibrating sieve mesh, and conveyed by a powder conveyance trough by a linear feeder. Structure. In addition, the powder cut-out portion includes a cylinder standing to accommodate powder, a rod slidable in the axial direction within the cylinder, and a rod driving means for controlling the upper surface position of the rod; A scraper mechanism that scrapes off the powder on the upper surface of the cylindrical body and a powder weight measuring means for measuring the weight of the powder stored in the cylindrical hole, and controls the amount of powder stored in the cylindrical hole at the position of the upper surface of the rod. Is a structure in which the powder is discharged and the amount is cut out by a scraper mechanism. Further, the pre-pressurizing unit includes a powder container and a pressurizing rod fitted into the powder container, and is configured to be transported in a state in which a light load is applied to the powder that has been quantitatively cut and solidified. .

例えば前記粉末切り出し部のロッド駆動手段は、ロッドをパルスモータにより変位させ高精度で位置決めする機構である。また粉末重量測定手段は、筒体、ロッド、ロッド駆動手段、及びそれらを支持している支持部材が載っているロードセルからなる。   For example, the rod driving means of the powder cutting part is a mechanism that positions the rod with high accuracy by displacing the rod by a pulse motor. The powder weight measuring means comprises a load cell on which a cylindrical body, a rod, a rod driving means, and a support member supporting them are placed.

このような流動性不良粉末の定量供給装置を用い、前記粉末切り出し部で、必要とする１回分より若干多めの粉末を供給し、前記粉末切り出し部では、筒体内のロッドを、必要とする１回分の粉末量が得られる付近の位置まで引き下げ、筒孔の深さと粉末充填量がほぼ直線関係になることを利用して、筒孔の深さ及び秤量データを基に演算を行い、過不足がある場合に筒孔の粉末を排出もしくは筒孔に粉末を追加することにより微調整して粉末を定量切り出し、定量切り出された粉末を前記予備加圧部で軽く固めた状態とし次工程に搬送する。つまり本発明では、リニアな計量調整機構を利用し、複数回の切り出しと計量を行うことで、定量化を図っている。   Using such a fixed quantity supply device for poor fluidity powder, a slightly larger amount of powder than the required one is supplied at the powder cut-out unit, and the powder cut-out unit requires a rod inside the cylinder 1 Pull down to the position where the powder amount of the batch can be obtained, and use the fact that the depth of the cylinder hole and the powder filling amount have a substantially linear relationship, and calculate based on the depth of the cylinder hole and the weighing data. If there is, finely adjust the powder by discharging the powder in the cylinder hole or adding powder to the cylinder hole and quantitatively cut out the powder. To do. That is, in the present invention, a linear measurement adjustment mechanism is used to perform quantification by performing a plurality of cutouts and measurement.

本発明に係る流動性不良粉末の定量供給装置は、篩網を有する粉箱をトラフ底面に近接配置することで造粒処理が施されていない流動性不良粉末を解きほぐし円滑に搬送でき、次いで筒体内のロッド上面位置を制御することで重量誤差ならびにばらつきの少ない状態で一定量の粉末を切り出すことができ、更に予備加圧によって固めた状態とすることで一定量の粉末量を確実に成型ダイスに搬送・充填することができる。   The fixed quantity supply device for poor flowability powder according to the present invention can dislodge smooth flowability powder that has not been granulated by disposing a powder box having a sieve mesh close to the bottom of the trough, By controlling the position of the upper surface of the rod in the body, it is possible to cut out a certain amount of powder with little weight error and variation, and by further solidifying by pre-pressurization, a certain amount of powder can be reliably molded Can be transported and filled.

本発明に係る流動性不良粉末の定量供給装置の構成例を図１に示す。Ａは側面図、Ｂは正面図（視野Ｘから見た図）である。この装置は、流動性不良粉末を搬送する粉末供給部１０と、該粉末供給部１０から搬送されてきた粉末を定量切り出しする粉末切り出し部１２と、該粉末切り出し部１２の後段に位置する予備加圧部１４とから構成される。ここで粉末供給部１０は流動性不良粉末を円滑に搬送する機能を有する部分、粉末切り出し部１２は必要とする量の粉末を定量切り出す機能を有する部分、予備加圧部１４は定量切り出した粉末を次工程である圧縮成型機１６に確実に搬送する機能を有する部分である。流動性不良粉末は、造粒処理などが施されていない流動性指数の低い（例えば流動性指数が３０以下）粉末である。   FIG. 1 shows a configuration example of a quantitative supply device for poor flowability powder according to the present invention. A is a side view and B is a front view (viewed from a field of view X). This apparatus includes a powder supply unit 10 that conveys poorly flowable powder, a powder cutout unit 12 that quantitatively cuts out the powder that has been conveyed from the powder supply unit 10, and a preliminary processing unit that is positioned after the powder cutout unit 12. The pressure part 14 is comprised. Here, the powder supply part 10 is a part having a function of smoothly transporting poorly flowable powder, the powder cutting part 12 is a part having a function of quantitatively cutting out a required amount of powder, and the pre-pressurizing part 14 is a powder obtained by quantitative cutting. It is a part which has the function to convey reliably to the compression molding machine 16 which is the next process. The poor fluidity powder is a powder having a low fluidity index (for example, a fluidity index of 30 or less) that has not been granulated.

粉末供給部１０は、断面Ｕ型の粉末搬送トラフ２０を有する直線フィーダ２２と、該粉末搬送トラフ２０の基端部の上方に取り付けた流動性不良粉末を受ける粉箱２４と、該粉箱２４の下面にて前記粉末搬送トラフ２０の底面に対して僅かな間隔（例えば５ｍｍ程度）をおいて平行に設置した篩網２６とを備え、粉箱２４に投入され凝集している流動性不良粉末を振動する篩網２６で解きほぐし直線フィーダ２２により粉末搬送トラフ２０で搬送する構造である。   The powder supply unit 10 includes a linear feeder 22 having a U-shaped powder conveyance trough 20, a powder box 24 that receives poorly flowable powder attached above the base end of the powder conveyance trough 20, and the powder box 24. And a sieving net 26 installed in parallel with a slight gap (for example, about 5 mm) on the bottom surface of the powder conveying trough 20, and injected into the powder box 24 and agglomerated, the poorly flowable powder Is unwound by a sieve screen 26 that vibrates and is conveyed by a powder conveying trough 20 by a linear feeder 22.

粉末供給部１０による流動性不良粉末の搬送動作を図２に示す。上方の原料投入口から粉箱２４に供給された流動性不良粉末は、図２のＡに示すように、篩網２６上で保持されるが、付着力が強いため多数の粉末が凝集して固まった状態（凝集した固まり状態を太線で示し、個々の粉末を細線で示す）になっている。直進フィーダの運転を開始すると、図２のＢに示すように、粉箱２４内で凝集している流動性不良粉末は、直進フィーダの振動により篩網２６上で解きほぐされ、ほぼ２個程度ずつに分離され粒径サイズが揃ったダマとなって篩網２６の目を通過して落下する。このダマが粉末搬送トラフ２０の底面まで落下し堆積するが、落下距離が短いことと、堆積する高さが低いため各ダマは変形することなく、その形状を維持し、あたかも造粒処理した粉末とほぼ同等の流動性が向上した状態となる。このため、図２のＣに示すように、流動性良好粉末とほぼ同様に円滑に粉末搬送トラフ２０の底面上を搬送できる。   FIG. 2 shows the conveying operation of the poor fluidity powder by the powder supply unit 10. The poorly flowable powder supplied to the powder box 24 from the upper raw material inlet is held on the sieve mesh 26 as shown in FIG. 2A, but a large number of powders aggregate due to strong adhesion. It is in a hardened state (the agglomerated solid state is indicated by a thick line, and individual powders are indicated by a thin line). When the operation of the linear feeder is started, as shown in FIG. 2B, the poorly flowable powder aggregated in the powder box 24 is unraveled on the sieve mesh 26 by the vibration of the linear feeder, and approximately two pieces. The particles are separated and become a lump having a uniform particle size and fall through the eyes of the sieve mesh 26. This dama falls to the bottom of the powder transport trough 20 and accumulates. However, since the fall distance is short and the accumulation height is low, each dama does not deform and maintains its shape, as if it is a granulated powder. As a result, the fluidity is almost the same. For this reason, as shown to C of FIG. 2, it can convey on the bottom face of the powder conveyance trough 20 as smoothly as a powder with favorable fluidity | liquidity.

直進フィーダ２２により粉末搬送トラフ２０の排出側に到達した流動性不良粉末は、先端部から落下して粉末を供給する。この時、粉末が広範囲に拡散しないように、先端を絞った漏斗２８を設けている。なお、粉末搬送量の調整は、粉末搬送トラフの間口寸法を増減させてもできるが、直進フィーダの振動数または振幅を電気的に調整して行なうこともできる。   The poorly flowable powder that has reached the discharge side of the powder transport trough 20 by the linear feeder 22 falls from the tip and supplies the powder. At this time, a funnel 28 having a narrowed tip is provided so that the powder does not diffuse widely. The powder conveyance amount can be adjusted by increasing / decreasing the size of the powder conveyance trough, but it can also be adjusted by electrically adjusting the frequency or amplitude of the linear feeder.

前記粉末切り出し部１２は、粉末を収容できるように立設されている筒体３０と、該筒体３０内で軸方向に摺動自在のロッド３２と、該ロッド３２の上面位置を制御するロッド駆動手段と、筒体上面の粉末を掻き払うスクレーパ機構と、筒孔３４内に収容されている粉末の重量を測定する粉末重量測定手段を備え、筒孔３４に収容される粉末量をロッドの位置で制御し、該ロッド３２の上昇で払い出しスクレーパ機構により定量切り出す構造である。前記筒体３０は、粉末供給部１０の漏斗２８の直下に配置される。   The powder cutout part 12 includes a cylindrical body 30 erected so as to accommodate powder, a rod 32 slidable in the axial direction within the cylindrical body 30, and a rod for controlling the upper surface position of the rod 32. Drive means, a scraper mechanism for scraping off the powder on the upper surface of the cylinder, and a powder weight measuring means for measuring the weight of the powder contained in the cylinder hole 34, the amount of powder accommodated in the cylinder hole 34 being the amount of the rod The structure is controlled by the position, and when the rod 32 is lifted, it is fixedly cut out by the pay-out scraper mechanism. The cylindrical body 30 is disposed directly below the funnel 28 of the powder supply unit 10.

ここでロッド駆動手段は、パルスモータ３６により連結軸３８を回転することでロッド３２を変位させ高精度で位置決めできるようにした機構である。パルスモータ３６を正転・逆転することにより、筒孔３４の深さを任意に調整することができる。粉末重量測定手段はロードセル４０である。ロードセル４０上には、筒体３０、ロッド３２、ロッド駆動手段（パルスモータ３６と連結軸３８）など、及びそれらを支持している支持部材４２が載っており、それらの重量を差し引くことで筒孔３４に充填されている粉末重量を計測することができる。またスクレーパ機構は、筒体３０の上面上方の粉末を払い除くスクレーパ４４と、該スクレーパ４４を水平方向に移動自在に支持する支持機構４６と、スクレーパ４４を駆動するモータ４８とからなる。そして、支持機構４６の前下方と後下方に、払い除いた粉末を受ける余剰粉末用漏斗５０と切り出し粉末用漏斗５２とが配置される。   Here, the rod driving means is a mechanism that allows the rod 32 to be displaced and positioned with high accuracy by rotating the connecting shaft 38 by the pulse motor 36. By rotating the pulse motor 36 forward and backward, the depth of the cylindrical hole 34 can be arbitrarily adjusted. The powder weight measuring means is the load cell 40. On the load cell 40, a cylindrical body 30, a rod 32, rod driving means (pulse motor 36 and connecting shaft 38), etc., and a support member 42 supporting them are placed, and the cylinder is obtained by subtracting their weight. The weight of the powder filled in the holes 34 can be measured. The scraper mechanism includes a scraper 44 that removes powder above the upper surface of the cylindrical body 30, a support mechanism 46 that supports the scraper 44 so as to be movable in the horizontal direction, and a motor 48 that drives the scraper 44. And the surplus powder funnel 50 and the cut-out powder funnel 52 that receive the powder that has been removed are disposed at the front lower side and the rear lower side of the support mechanism 46.

粉末切り出し部１２による定量切り出し方法は、筒孔３４に粉末を上方から落とし込んで供給すると、筒孔深さと筒孔の中に充填した粉末量が、ほぼ直線関係になることを利用している。具体的には、筒体３０内のロッド３２を、必要とする１回分の粉末量が得られる付近の位置まで引き下げ、この筒孔３４に粉末を上方から落とし込んで供給して、充填した粉末量を測定する。充填した粉末量が必要とする量と一致しているか否かを判定し、過不足がある場合には、筒孔の深さ及び秤量データを基に演算を行い、筒孔の粉末を排出もしくは筒孔に粉末を追加することにより微調整して粉末を定量切り出しする。   The quantitative cut-out method by the powder cut-out unit 12 utilizes the fact that when powder is dropped into the cylindrical hole 34 and supplied from above, the depth of the cylindrical hole and the amount of powder filled in the cylindrical hole are in a substantially linear relationship. Specifically, the rod 32 in the cylinder 30 is pulled down to a position where a required amount of powder can be obtained, and the powder is dropped into the cylinder hole 34 from above and supplied, and the amount of powder filled. Measure. It is determined whether the amount of the filled powder matches the required amount, and if there is excess or deficiency, the calculation is performed based on the depth of the cylinder hole and the weighing data, and the powder in the cylinder hole is discharged or discharged. Finely adjust the powder by adding powder to the cylindrical hole and cut out the powder quantitatively.

予備加圧部１４は、粉末収容筒６０と、該粉末収容筒内６０に嵌入する加圧用ロッド６２を備え、定量切り出された粉末に軽荷重を加えて固めた状態で次工程へ搬送する構成である。粉末切り出し漏斗５２に払い出した粉末は、粉末受け口６４を通り、粉末収納筒６０に収納される。モータ６６とギア６８により加圧用ロッド６２を下降させ、粉末に軽荷重を加えて崩れない程度に軽く固める。なお、粉末収納筒６０の形状は、次工程の圧縮成型装置１７の成型ダイス７０の孔径より一回り小さい孔径とする。加圧用ロッド６２をモータ６６とギア６８により元の位置に戻し、ダイス孔７２上まで移動させて（白抜き矢印で示す）、軽く固められた状態のままダイス孔に落とし込んで充填する。   The pre-pressurization unit 14 includes a powder container 60 and a pressure rod 62 that fits into the powder container 60, and is transported to the next process in a state where a light load is applied to the powder that has been quantitatively cut and solidified. It is. The powder discharged to the powder cutting funnel 52 passes through the powder receiving port 64 and is stored in the powder storage cylinder 60. The pressure rod 62 is lowered by the motor 66 and the gear 68, and lightly hardened to such an extent that a light load is applied to the powder so as not to collapse. The shape of the powder storage cylinder 60 is set to a hole diameter that is slightly smaller than the hole diameter of the molding die 70 of the compression molding apparatus 17 in the next process. The pressurizing rod 62 is returned to the original position by the motor 66 and the gear 68, moved to the die hole 72 (indicated by a white arrow), and dropped into the die hole and filled in a lightly solidified state.

このような定量供給装置の次工程に位置する圧縮成型装置は、既存のものでよく、成型ダイス７０と下杵７４と上杵（図示するのを省略）とから構成され、成型ダイス内に粉末（軽く固められた状態）が充填され、昇降する下杵７４と上杵が粉末を圧縮成型する。成型されたペレットは、下杵７４によって成型ダイス７０の上部に押し上げられ、排出される。   The compression molding apparatus located in the next step of such a quantitative supply apparatus may be an existing one, and is composed of a molding die 70, a lower punch 74, and an upper punch (not shown), and a powder is contained in the molding die. (Lightly solidified state) is filled, and the lower and upper lower ridges 74 and the upper ridge compress the powder. The molded pellets are pushed up by the lower punch 74 to the upper part of the molding die 70 and discharged.

次に、本発明装置による粉末の定量切り出しについて図３により説明する。この定量切り出し方法では、必要とする粉末量に対し、少し多めの粉末を筒孔内に供給し、秤量・演算により余剰粉末を払い出して必要とする粉末量に調整する。   Next, quantitative cutting of the powder by the apparatus of the present invention will be described with reference to FIG. In this quantitative cut-out method, a slightly larger amount of powder is supplied into the cylindrical hole than the required amount of powder, and surplus powder is dispensed by weighing and calculation to be adjusted to the required amount of powder.

（ａ）粉末供給および調整（切り出し１回目）
筒体３０の筒孔深さを、必要とする粉末量に対して少し多めに充填できる深さｈ0 （ｍｍ）に設定する。漏斗２８から筒孔３４に供給する粉末量は、筒孔３４に充填して、少し溢れ出るぐらいに直進フィーダ２２の振動数、ストローク、運転時間などを調整する。溢れ出た粉末は、モータ４８を運転することにより余剰粉末用漏斗５０方向に向かうスクレーパ４４で掻き払い、余剰粉末用漏斗５０に払い出す。払い出された粉末はコンベアなどの余剰粉末リサイクル手段を用い、粉箱２４に戻す。筒孔３４内に充填している粉末重量を、ロードセル４０で測定する（この重量をＷ0 （ｇ）とする）。なお、必要とする重量をＷ（ｇ）とする。この状態では、Ｗ＜Ｗ0 となっている。 (A) Powder supply and adjustment (first cut)
The depth of the cylindrical hole of the cylindrical body 30 is set to a depth h 0 (mm) that can be filled a little more than the required amount of powder. The amount of powder supplied from the funnel 28 to the tube hole 34 is adjusted to the frequency, stroke, operation time, etc. of the linear feeder 22 so that the tube hole 34 is filled and overflows a little. The overflowing powder is scraped off by the scraper 44 directed toward the surplus powder funnel 50 by operating the motor 48 and discharged to the surplus powder funnel 50. The discharged powder is returned to the powder box 24 using surplus powder recycling means such as a conveyor. The weight of the powder filled in the cylindrical hole 34 is measured by the load cell 40 (this weight is defined as W 0 (g)). The required weight is W (g). In this state, it has become a W <W 0.

（ｂ）余剰粉末を取り除く操作（切り出し２回目）
前記（ａ）の操作により、充填深さｈ0 （ｍｍ）のときの粉末充填量Ｗ0 （ｇ）は分かっている。また充填深さと粉末充填量は、充填深さ０（ｍｍ）のとき粉末充填量０（ｇ）となる直線関係にあるものとする。これより、任意の充填深さｈ（０≦ｈ≦ｈ0 ）における粉末充填量Ｗ（ｈ）は次式のような関係となる。
Ｗ（ｈ）＝（Ｗ0 ／ｈ0 ）・ｈ＝Ａ・ｈ …（１）
従って、必要とする粉末重量Ｗ（ｇ）に対して余剰粉末重量ΔＷは次式のようになる。
ΔＷ＝Ｗ0 −Ｗ …（２）
（１）式から、
ｈ＝Ｗ（ｈ）／Ａ …（３）
であるので、（３）式のＷ（ｈ）にΔＷ（ｇ）を代入し、余剰粉末重量（ΔＷ）に相当する充填深さｈ′（ｍｍ）を求めると、
ｈ′＝ΔＷ／Ａ …（４）
となる。そこで、パルスモータ３６によってロッド３２を、（４）式で算出した充填深さｈ′（ｍｍ）上昇させて、ｈ′（ｍｍ）深さ分の粉末を筒孔３４から押し出す。そして、モータ４８を運転することにより余剰粉末用漏斗５０方向に向かうスクレーパ４４で掻き払い、余剰粉末用漏斗５０に払い出す。この払い出された粉末は、剰余粉末リサイクル手段を経て粉箱２４に戻す。筒孔３４に充填されている粉末重量をロードセル４０で測定する（この重量をＷ0 ′（ｇ）とする）。必要とする粉末重量はＷ（ｇ）である。
Ｗ≧Ｗ0 ′である場合は （ｄ）項に示す操作を行ない定量切り出す。
Ｗ＜Ｗ0 ′である場合は、次の（ｃ）項の操作を行なう。 (B) Operation to remove excess powder (second cut)
By the operation (a), the powder filling amount W 0 (g) at the filling depth h 0 (mm) is known. Further, it is assumed that the filling depth and the powder filling amount have a linear relationship in which the powder filling amount is 0 (g) when the filling depth is 0 (mm). Accordingly, the powder filling amount W (h) at an arbitrary filling depth h (0 ≦ h ≦ h 0 ) has a relationship as shown in the following equation.
W (h) = (W 0 / h 0 ) · h = A · h (1)
Therefore, the surplus powder weight ΔW with respect to the required powder weight W (g) is expressed by the following equation.
ΔW = W 0 −W (2)
From equation (1)
h = W (h) / A (3)
Therefore, when ΔW (g) is substituted for W (h) in the equation (3) and the filling depth h ′ (mm) corresponding to the excess powder weight (ΔW) is obtained,
h ′ = ΔW / A (4)
It becomes. Therefore, the rod 32 is raised by the pulse motor 36 to the filling depth h ′ (mm) calculated by the equation (4), and the powder corresponding to the depth h ′ (mm) is pushed out from the cylindrical hole 34. Then, by operating the motor 48, the scraper 44 toward the surplus powder funnel 50 is scraped off and discharged to the surplus powder funnel 50. The discharged powder is returned to the powder box 24 through a surplus powder recycling means. The weight of the powder filled in the cylindrical hole 34 is measured by the load cell 40 (this weight is defined as W 0 ′ (g)). The required powder weight is W (g).
When W ≧ W 0 ′, the operation shown in the item (d) is performed and a quantitative cut-out is performed.
When W <W 0 ′, the operation of the next item (c) is performed.

（ｃ）余剰粉末を取り除く操作（切り出し３回目）
前記（ｂ）項の操作終了時には、（４）式の充填深さｈ′（ｍｍ）に対する粉末重量はＷ0 −Ｗ0 ′（ｇ）のデータが得られる。従って、充填深さｈ0 （ｍｍ）のときの粉末充填量Ｗ0 （ｇ）と（４）式の充填深さｈ′（ｍｍ）のときの粉末重量Ｗ0 −Ｗ0 ′（ｇ）の２つのデータから、任意の充填深さｈ（０≦ｈ≦ｈ0 ）における充填量Ｗ′（ｈ）は次式のような関係となる。
Ｗ′（ｈ）＝ｈ・（Ｗ0 −（Ｗ0 −Ｗ0 ′））／（ｈ0 −ｈ′）
＝ｈ・Ｗ0 ′／（ｈ0 −ｈ′）
＝ｈ・Ｂ …（５）
以下、（ｂ）項の（２）式以降と同様に展開していく。必要とする重量Ｗ（ｇ）に対して余剰粉末重量ΔＷ′は（６）式となる。
ΔＷ′＝ Ｗ0 ′−Ｗ …（６）
（５）式を変形すると、
ｈ＝Ｗ′（ｈ）／Ｂ …（７）
である。（７）式のＷ′（ｈ）をΔＷ′（ｇ）を代入し、余剰粉末重量（ΔＷ′）に相当する充填深さｈ″（ｍｍ）を求めると、
ｈ″＝ΔＷ′／Ｂ …（８）
となる。そこでパルスモータ３６によりロッド３２を、（８）式で算出した充填深さｈ″（ｍｍ）上昇させて、ｈ″（ｍｍ）深さ分の粉末を筒孔３４から押し出す。モータ４８を運転することにより余剰粉末用漏斗５０方向に向かうスクレーパ４４で掻き払い、余剰粉末用漏斗５０に払い出す。この払い出された粉末は、剰余粉末リサイクル手段を経て粉箱２４に戻す。筒孔３４内に充填されている粉末重量をロードセル４０で測定する。 (C) Operation to remove excess powder (third cut)
At the end of the operation of the item (b), data of W 0 -W 0 ′ (g) is obtained as the powder weight with respect to the filling depth h ′ (mm) in the equation (4). Therefore, the powder filling amount W 0 (g) at the filling depth h 0 (mm) and the powder weight W 0 −W 0 ′ (g) at the filling depth h ′ (mm) in the equation (4). From the two data, the filling amount W ′ (h) at an arbitrary filling depth h (0 ≦ h ≦ h 0 ) is represented by the following equation.
W ′ (h) = h · (W 0 − (W 0 −W 0 ′)) / (h 0 −h ′)
= H · W 0 '/ (h 0 -h')
= H · B (5)
In the following, the expansion is performed in the same manner as the expression (2) and thereafter in the item (b). The excess powder weight ΔW ′ with respect to the required weight W (g) is expressed by equation (6).
ΔW ′ = W 0 ′ −W (6)
When formula (5) is transformed,
h = W ′ (h) / B (7)
It is. Substituting ΔW ′ (g) for W ′ (h) in the equation (7) and obtaining the filling depth h ″ (mm) corresponding to the excess powder weight (ΔW ′),
h ″ = ΔW ′ / B (8)
It becomes. Accordingly, the rod 32 is raised by the pulse motor 36 to increase the filling depth h ″ (mm) calculated by the equation (8), and the powder corresponding to the depth h ″ (mm) is pushed out from the cylindrical hole 34. By operating the motor 48, the scraper 44 is scraped off toward the surplus powder funnel 50, and is discharged to the surplus powder funnel 50. The discharged powder is returned to the powder box 24 through a surplus powder recycling means. The weight of the powder filled in the cylindrical hole 34 is measured by the load cell 40.

（ｄ）粉末切り出し
筒孔３４内に充填されている粉末を、パルスモータ３６によってロッド３２を筒体３０の上面位置まで上昇させて筒孔３４内の粉末を払い出す。モータ４４を運転することにより、粉末切り出し漏斗５２方向に向かうスクレーパ４４で粉末を掻き払い、粉末切り出し漏斗５２に払い出す。粉末切り出し漏斗５２の排出口から切り出した粉末を排出し、次工程へ搬送する。 (D) Powder cutting The powder filled in the cylindrical hole 34 is lifted up to the upper surface position of the cylindrical body 30 by the pulse motor 36 to discharge the powder in the cylindrical hole 34. By operating the motor 44, the powder is scraped off by the scraper 44 toward the powder cutting funnel 52, and discharged to the powder cutting funnel 52. The powder cut out from the discharge port of the powder cutting funnel 52 is discharged and conveyed to the next step.

上記の粉末切り出しの例では、筒孔３４に、切り出したい粉末量に対し、あらかじめ少し多めに充填して、１回乃至２回の取り除き操作を行って定量にする方法を説明したが、筒孔に少なめに充填して、その後、粉末を加える操作を行って定量にする方法もある。これらの演算・制御は、マイクロコンピュータなどを用いプログラムで行うようにする。   In the above example of cutting out the powder, a method has been described in which the cylindrical hole 34 is filled with a slightly larger amount in advance with respect to the amount of powder to be cut, and the removal operation is performed once or twice for quantitative determination. There is also a method in which a small amount is filled and then powder is added for quantitative determination. These calculations and controls are performed by a program using a microcomputer or the like.

実際に粉末を用いて試験を行った結果について説明する。試験に用いた粉末の流動性測定結果を表１に示す。これは、パウダテスタＰＴ−Ｎ型（製品名：ホソカワミクロン株式会社製）で流動性測定した結果（３回測定の平均値）である。流動性の総合的評価は、流動性指数が１００点に近づくに従い流動性良好と評価する。   The results of actual tests using powder will be described. Table 1 shows the flowability measurement results of the powder used in the test. This is a result (average value of three measurements) of fluidity measurement using a powder tester PT-N type (product name: manufactured by Hosokawa Micron Corporation). The overall evaluation of fluidity is evaluated as good fluidity as the fluidity index approaches 100 points.

Figure 2008074592
材料組成によらず、造粒粉は流動性が良好であるが、造粒処理していない微粉は流動性指数が３０程度以下で流動性は悪い。
Figure 2008074592
 Regardless of the material composition, the granulated powder has good fluidity, but the fine powder that has not been granulated has a fluidity index of about 30 or less and poor fluidity.

モリブデン粉末を用いて、従来構造のトラフ（粉箱及び篩網無し）と本発明構造のトラフ（粉箱及び篩網付き）の直進フィーダによる粉末の搬送試験を行った。通常使用されている従来構造のトラフでは、流動性良好な粉末（造粒粉）は円滑に搬送できたが、流動性不良粉末（造粒処理されていない微粉）は搬送できなかった。しかし、本発明構造のトラフを用いると、従来技術では搬送できなかった流動性不良粉末も円滑に搬送することができた。試験結果を表２に示す。   Using molybdenum powder, a powder conveyance test was conducted using a straight feeder of a trough having a conventional structure (without powder box and sieve mesh) and a trough having the structure of the present invention (with powder box and sieve mesh). In a trough having a conventional structure that is normally used, powder with good fluidity (granulated powder) could be smoothly conveyed, but powder with poor fluidity (fine powder not granulated) could not be conveyed. However, when the trough having the structure of the present invention was used, poorly flowable powder that could not be transported by the prior art could be transported smoothly. The test results are shown in Table 2.

Figure 2008074592
Figure 2008074592

筒孔深さに対する粉末充填量の関係を図４に示す。これは、モリブデン微粉を用い、５回試験を試みた結果である。この結果から、筒孔に粉末を上方から落とし込んで供給すると、筒孔深さと筒孔の中に充填された粉末量が、ほぼ直線関係になることが分かる。   FIG. 4 shows the relationship between the powder filling amount and the cylinder hole depth. This is the result of trying the test five times using molybdenum fine powder. From this result, it can be seen that when the powder is dropped into the cylinder hole and supplied from above, the depth of the cylinder hole and the amount of the powder filled in the cylinder hole have a substantially linear relationship.

次に、発明方法により粉末定量切り出し試験を行なった結果を表３に示す。

Figure 2008074592
Next, Table 3 shows the results of the powder quantitative cutting test performed by the inventive method.
Figure 2008074592

比重１０．２ｇ／ｃｍ3 のモリブデン粉の切り出し量を２．６５ｇに設定し、流動性良好粉末、および流動性不良粉末について切り出し試験を行なった。その結果、流動性良好粉末、流動性不良粉末ともに、切り出し３回で設定した切り出し量２．６５ｇに揃えることができた。また、切り出し２回目以降では、流動性良好粉末、および流動性不良粉末の標準偏差（重量ばらつき幅）が同じとなることを確認した。また、比重５．０ｇ／ｃｍ3 のフェライト粉の切り出し量を０．５５ｇに設定し、流動性良好粉末、および流動性不良粉末について切り出し試験を行なった。その結果、流動性良好粉末、流動性不良粉末ともに、切り出し３回で設定した切り出し量０．５５ｇに揃えることができた。また、切り出し２回目以降では、流動性良好粉末、および不良粉末の標準偏差値（重量ばらつき幅）が同じとなることを確認した。これらの結果から、３回の切り出し操作で、ばらつきの少ない（標準偏差値が０．０１ｇ以下）定量切り出しができることが確認できた。なお、許容できる標準偏差値が大きくてよい場合（例えば、許容できる標準偏差値が０．０４ｇ以上の場合など）には、切り出し１回でよいため、流動性不良粉末を短時間（０．５秒程度）で供給できることも確認できた。 The cut-out amount of molybdenum powder having a specific gravity of 10.2 g / cm 3 was set to 2.65 g, and cut-out tests were performed on powder with good fluidity and powder with poor fluidity. As a result, both the good fluidity powder and the poor fluidity powder were able to be aligned to the cutout amount of 2.65 g set in the third cutout. Further, it was confirmed that the standard deviation (weight variation width) of the good fluidity powder and the poor fluidity powder was the same after the second cut. Further, the cutting amount of ferrite powder having a specific gravity of 5.0 g / cm 3 was set to 0.55 g, and cutting tests were performed on powders with good fluidity and powders with poor fluidity. As a result, both the good fluidity powder and the poor fluidity powder were able to be aligned to the cutout amount of 0.55 g set by three cutouts. In addition, it was confirmed that the standard deviation value (weight variation width) of the powder with good fluidity and the defective powder was the same after the second cut. From these results, it was confirmed that quantitative cutout with little variation (standard deviation value of 0.01 g or less) can be performed by three cutout operations. In addition, when the allowable standard deviation value may be large (for example, when the allowable standard deviation value is 0.04 g or more, etc.), it is sufficient to cut out the poorly flowable powder for a short time (0.5%). It was confirmed that it could be supplied in about 2 seconds).

圧縮成型機のダイス孔への粉末充填状況について説明する。流動性不良粉末は、約４９ｋＰａ（０．５ｋｇ／ｃｍ2 ：加圧用ロッドの重量も含む）の圧力を加えることにより固まり(ペレット)状態となり、固まった状態でダイス孔に落とし込み充填できることが確認できた。また、ダイス孔に充填された流動性不良粉末の固まりに対して、下杵と上杵で圧縮することで、所定の形状・重量の製品に成型することができた。 The state of powder filling into the die hole of the compression molding machine will be described. It can be confirmed that the poorly flowable powder becomes a solid (pellet) state by applying a pressure of about 49 kPa (0.5 kg / cm 2 : including the weight of the pressurizing rod) and can be filled by dropping into the die hole in the solid state. It was. Further, the mass of poorly flowable powder filled in the die hole was compressed with a lower iron and an upper iron, so that a product having a predetermined shape and weight could be formed.

本発明に係る流動性不良粉末の定量供給装置の構成例を示す説明図。Explanatory drawing which shows the structural example of the fixed quantity supply apparatus of the fluidity | liquidity poor powder which concerns on this invention. その粉末供給部の動作説明図。Operation | movement explanatory drawing of the powder supply part. 粉末切り出し方法の一例を示すフロー図。The flowchart which shows an example of the powder cutting-out method. 筒孔深さと粉末充填量の関係を示すグラフ。The graph which shows the relationship between a cylinder hole depth and a powder filling amount.

符号の説明Explanation of symbols

１０ 粉末供給部
１２ 粉末切り出し部
１４ 予備加圧部
１６ 圧縮成型機
２０ 粉末搬送トラフ
２２ 直進フィーダ
２４ 粉箱
２６ 篩網
３０ 筒体
３２ ロッド
３４ 筒孔
３６ パルスモータ
４０ ロードセル
４４ スクレーパ
６０ 粉末収納筒
６２ 加圧用ロッド
７０ 成型ダイス
７２ ダイス孔 DESCRIPTION OF SYMBOLS 10 Powder supply part 12 Powder cut-out part 14 Pre-pressurization part 16 Compression molding machine 20 Powder conveyance trough 22 Straight feeder 24 Powder box 26 Sieve net 30 Cylinder 32 Rod 34 Cylinder hole 36 Pulse motor 40 Load cell 44 Scraper 60 Powder storage cylinder 62 Pressure rod 70 Molding die 72 Die hole

Claims (3)

粉末を搬送する粉末供給部と、該粉末供給部から搬送されてきた粉末を定量切り出しする粉末切り出し部と、該粉末切り出し部の後段に位置する予備加圧部を具備し、
前記粉末供給部は、断面Ｕ型の粉末搬送トラフを有する直線フィーダと、前記粉末搬送トラフの一端部の上方に取り付けた流動性不良粉末を受ける粉箱と、該粉箱の下面にて前記トラフの底面に対して平行に間隔をおいて設置した篩網とを備え、粉箱に投入され凝集している流動性不良粉末を振動する篩網で解きほぐし直線フィーダにより粉末搬送トラフで搬送する構造であり、
前記粉末切り出し部は、粉末を収容するように立設されている筒体と、該筒体内で軸方向に摺動自在のロッドと、該ロッドの上面位置を制御するロッド駆動手段と、筒体上面の粉末を掻き払うスクレーパ機構と、筒孔に収容されている粉末の重量を測定する粉末重量測定手段を備え、筒孔に収容される粉末量をロッド上面位置で制御し、該ロッドの上昇で粉末を払い出しスクレーパ機構により定量切り出す構造であり、
前記予備加圧部は、粉末収容筒と、該粉末収容筒内に嵌入する加圧用ロッドを備え、定量切り出された粉末に軽荷重を加えて固めた状態で搬送可能にする構造であることを特徴とする流動性不良粉末の定量供給装置。 A powder supply unit that conveys powder, a powder cut-out unit that quantitatively cuts out the powder that has been conveyed from the powder supply unit, and a pre-pressurization unit that is located after the powder cut-out unit,
The powder supply unit includes a linear feeder having a U-shaped powder conveying trough, a powder box for receiving poorly flowable powder attached above one end of the powder conveying trough, and the trough on the lower surface of the powder box. With a sieve mesh installed parallel to the bottom of the slab, and unpacking the poorly flowable powder that has been put into the powder box and aggregating it with a vibrating sieve mesh and conveying it with a powder feeder trough by a linear feeder Yes,
The powder cut-out section includes a cylindrical body standing so as to accommodate powder, a rod slidable in the axial direction within the cylindrical body, rod driving means for controlling the upper surface position of the rod, and a cylindrical body A scraper mechanism for scraping off the powder on the upper surface and a powder weight measuring means for measuring the weight of the powder accommodated in the cylindrical hole. The amount of powder accommodated in the cylindrical hole is controlled at the position of the upper surface of the rod, and the rod is lifted It is a structure that dispenses powder with a scraper mechanism and quantitatively cuts out,
The pre-pressurizing unit includes a powder container and a pressure rod that fits into the powder container, and is configured to be transported in a state in which a light load is applied to the powder that has been quantitatively cut and solidified. A quantitative supply device for poorly flowable powder. 前記粉末切り出し部のロッド駆動手段は、ロッドをパルスモータにより変位させ位置決めする機構であり、粉末重量測定手段は、筒体、ロッド、ロッド駆動手段、及びそれらを支持している支持部材が載っているロードセルからなる請求項１記載の流動性不良粉末の定量供給装置。   The rod driving means of the powder cutting section is a mechanism for displacing and positioning the rod by a pulse motor, and the powder weight measuring means is provided with a cylindrical body, a rod, a rod driving means, and a support member that supports them. The quantitative supply apparatus of poor flowability powder according to claim 1, comprising a load cell. 請求項１又は２記載の流動性不良粉末の定量供給装置を用い、前記粉末切り出し部で、必要とする１回分より若干多めの粉末を供給し、前記粉末切り出し部では、筒体内のロッドを、必要とする１回分の粉末量が得られる付近の位置まで引き下げ、筒孔の深さと粉末充填量がほぼ直線関係になることを利用して、筒孔の深さ及び秤量データを基に演算を行い、過不足がある場合に筒孔の粉末を排出もしくは筒孔に粉末を追加することにより微調整して粉末を定量切り出し、定量切り出された粉末を前記予備加圧部で軽く固めた状態とし次工程に搬送する流動性不良粉末の定量供給方法。   Using the quantitative supply device for poor fluidity powder according to claim 1 or 2, the powder cutting unit supplies a slightly larger amount of powder than necessary, and in the powder cutting unit, the rod in the cylinder is Pull down to a position where the required amount of powder can be obtained, and use the fact that the depth of the cylinder hole and the powder filling amount are in a substantially linear relationship, and calculate based on the depth of the cylinder hole and the weighing data. If there is excess or deficiency, finely adjust the powder by discharging the powder in the cylinder hole or adding powder to the cylinder hole to quantitatively cut out the powder, and let the powder that has been quantitatively cut out lightly hardened in the pre-pressurization part A method for quantitatively supplying poorly flowable powder to be conveyed to the next process.
JP2006258516A 2006-09-25 2006-09-25 Quantitative feeder for poorly flowable powder Expired - Fee Related JP4821027B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107167042A (en) * 2017-06-20 2017-09-15 常德鼎工烟花爆竹科技发展有限公司 One kind quick-fried powder material proportioning device of danger and quantitative barrel structure
CN108394010A (en) * 2017-12-26 2018-08-14 王阳光 Boxlike air-driven type automates fabricated device

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Publication number Priority date Publication date Assignee Title
JPS5737501A (en) * 1980-08-14 1982-03-01 Sonobe Kazunari Method and device for equally dividing amount of powdered and granular body required
JPS61193800A (en) * 1985-02-21 1986-08-28 Kobe Steel Ltd Production of composite billet
JPS6421137A (en) * 1987-07-15 1989-01-24 Kajima Corp Vertical holder for post in large-scale building constructing method
JP2002001592A (en) * 2000-06-20 2002-01-08 Kohtaki Seiki Kk Multi-layer forming press with plate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5737501A (en) * 1980-08-14 1982-03-01 Sonobe Kazunari Method and device for equally dividing amount of powdered and granular body required
JPS61193800A (en) * 1985-02-21 1986-08-28 Kobe Steel Ltd Production of composite billet
JPS6421137A (en) * 1987-07-15 1989-01-24 Kajima Corp Vertical holder for post in large-scale building constructing method
JP2002001592A (en) * 2000-06-20 2002-01-08 Kohtaki Seiki Kk Multi-layer forming press with plate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107167042A (en) * 2017-06-20 2017-09-15 常德鼎工烟花爆竹科技发展有限公司 One kind quick-fried powder material proportioning device of danger and quantitative barrel structure
CN108394010A (en) * 2017-12-26 2018-08-14 王阳光 Boxlike air-driven type automates fabricated device

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