JP3373432B2 - Dehydration press - Google Patents
Dehydration pressInfo
- Publication number
- JP3373432B2 JP3373432B2 JP16351198A JP16351198A JP3373432B2 JP 3373432 B2 JP3373432 B2 JP 3373432B2 JP 16351198 A JP16351198 A JP 16351198A JP 16351198 A JP16351198 A JP 16351198A JP 3373432 B2 JP3373432 B2 JP 3373432B2
- Authority
- JP
- Japan
- Prior art keywords
- screw shaft
- compression chamber
- solid
- liquid mixture
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
- B30B9/18—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing with means for adjusting the outlet for the solid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
- B30B9/124—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing using a rotatable and axially movable screw
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filtration Of Liquid (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、廃水汚泥を脱水し
て廃水汚泥の含水率を下げたり、植物を混入した液体を
脱水して植物の搾り汁を取り出したり、固形物を混入し
た液体を脱水して固形物と液体に分離したりする脱水プ
レスに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to dehydrating wastewater sludge to reduce the water content of the wastewater sludge, dehydrating a liquid mixed with plants to take out squeezed juice of plants, and removing liquid containing solid matter. The present invention relates to a dewatering press for dewatering and separating into solid matter and liquid.
【０００２】[0002]
【従来の技術】この種の脱水プレスには、液体透過性筒
内の固形物と液体が混合した固液混合物を、回転するス
クリュー軸で圧縮するスクリュープレスと、前進するプ
ランジャで圧縮するプランジャプレスがある。2. Description of the Related Art A dewatering press of this type includes a screw press for compressing a solid-liquid mixture in which a solid and a liquid in a liquid-permeable cylinder are mixed with a rotating screw shaft and a plunger press for compressing with a forward plunger. There is.
【０００３】＜スクリュープレス＞
これは、液体透過性のスクリーン筒にスクリュー軸を嵌
合している。スクリーン筒は、周壁に多数の小孔を貫通
している。スクリュー軸は、中央部に羽根を螺旋状に巻
き付けている。スクリュー軸を回転駆動する装置を設け
ている。<Screw Press> In this, a screw shaft is fitted in a liquid-permeable screen cylinder. The screen cylinder has a large number of small holes penetrating the peripheral wall. A blade is spirally wound around the center of the screw shaft. A device for rotating the screw shaft is provided.
【０００４】スクリーン筒とスクリュー軸の羽根付き部
分の間には、螺旋状の移送圧縮通路を形成している。移
送圧縮通路は、入口側より出口側の断面積を小さくして
いる。A spiral transfer compression passage is formed between the screen cylinder and the bladed portion of the screw shaft. The transfer compression passage has a smaller cross-sectional area on the outlet side than on the inlet side.
【０００５】スクリーン筒とスクリュー軸の羽根なし部
分の間には、円環形状ないし円筒形状の圧縮室を形成し
ている。圧縮室は、移送圧縮通路の出口を入口とし、ス
クリーン筒の開口端を出口としている。圧縮室の出口に
は、その流出抵抗を増減する抵抗体を設けている。An annular or cylindrical compression chamber is formed between the screen cylinder and the bladeless portion of the screw shaft. The compression chamber has the outlet of the transfer compression passage as the inlet and the opening end of the screen cylinder as the outlet. The outlet of the compression chamber is provided with a resistor that increases or decreases the outflow resistance.
【０００６】スクリュー軸を回転し、固液混合物を移送
圧縮通路の入口に供給する。すると、スクリュー軸の回
転によって、固液混合物が自転しつつスクリュー軸の回
りを公転して螺旋状の移送圧縮通路を移送され、その移
送中に圧縮され、固液混合物から分離した液体がスクリ
ーン筒の小孔から流出する。The screw shaft is rotated to supply the solid-liquid mixture to the inlet of the transfer compression passage. Then, due to the rotation of the screw shaft, the solid-liquid mixture revolves around the screw shaft while rotating around the screw shaft, is transferred through the spiral transfer compression passage, is compressed during the transfer, and the liquid separated from the solid-liquid mixture is transferred to the screen cylinder. It flows out from the small hole of.
【０００７】移送圧縮通路を通過中に含水率が低下した
固液混合物は、後続の固液混合物によって押され、圧縮
室に送り込まれて更に圧縮され、固液混合物から分離し
た液体がスクリーン筒の小孔から流出する。圧縮室を通
過中に含水率が更に低下した固液混合物は、脱水ケーキ
になり、圧縮室の出口から抵抗体によって抵抗を受けつ
つ押し出される。The solid-liquid mixture whose water content has been lowered while passing through the transfer compression passage is pushed by the subsequent solid-liquid mixture, is sent to the compression chamber and is further compressed, and the liquid separated from the solid-liquid mixture is transferred to the screen cylinder. It flows out from the small hole. The solid-liquid mixture whose water content is further reduced while passing through the compression chamber becomes a dehydrated cake, and is extruded from the outlet of the compression chamber while receiving resistance from the resistor.
【０００８】＜プランジャプレス＞
これは、液体透過性のスクリーン筒にプランジャを嵌合
している。スクリーン筒は、周壁に多数の小孔を貫通し
ている。プランジャを前後進する装置を設けている。<Plunger Press> This has a plunger fitted in a liquid-permeable screen cylinder. The screen cylinder has a large number of small holes penetrating the peripheral wall. A device for moving the plunger forward and backward is provided.
【０００９】スクリーン筒は、プランジャ前進端側の開
口端に液体透過性の開閉蓋を取り付けている。開閉蓋
は、多数の小孔を貫通している。スクリーン筒の開閉蓋
とプランジャの間には、円柱形状の圧縮室を形成してい
る。圧縮室は、スクリーン筒のプランジャ後退端側の周
壁に入口を設け、スクリーン筒の開閉蓋付き開口端を出
口としている。A liquid-permeable opening / closing lid is attached to the opening end of the screen cylinder on the plunger forward end side. The opening / closing lid penetrates a large number of small holes. A cylindrical compression chamber is formed between the opening / closing lid of the screen cylinder and the plunger. The compression chamber has an inlet provided on the peripheral wall of the screen cylinder on the plunger retreat end side, and has an outlet at the open end with the opening / closing lid of the screen cylinder.
【００１０】開閉蓋が閉鎖してプランジャが後退した状
態で、圧縮室にその入口から一定量の固液混合物を投入
し、プランジャを前進する。プランジャの前端が圧縮室
の入口を通過すると、圧縮室の入口がプランジャで閉鎖
される。プランジャの前進に従って圧縮室の長さが縮小
し、圧縮室の固液混合物が圧縮され、固液混合物から分
離した液体がスクリーン筒の小孔と開閉蓋の小孔から流
出する。With the opening / closing lid closed and the plunger retracted, a fixed amount of solid-liquid mixture is introduced into the compression chamber from its inlet, and the plunger is advanced. When the front end of the plunger passes through the inlet of the compression chamber, the inlet of the compression chamber is closed by the plunger. As the plunger advances, the length of the compression chamber decreases, the solid-liquid mixture in the compression chamber is compressed, and the liquid separated from the solid-liquid mixture flows out through the small holes in the screen cylinder and the small holes in the opening / closing lid.
【００１１】圧縮室の固液混合物が脱水されて脱水ケー
キになると、開閉蓋を開放し、プランジャを更に前進
し、脱水ケーキを圧縮室の出口から押し出す。その後、
開閉蓋を閉鎖し、プランジャを後退し、再び、圧縮室に
一定量の固液混合物を入れ、前回と同様に、プランジャ
を前進する。When the solid-liquid mixture in the compression chamber is dehydrated to form a dehydrated cake, the opening / closing lid is opened, the plunger is further advanced, and the dehydrated cake is pushed out from the outlet of the compression chamber. afterwards,
The open / close lid is closed, the plunger is retracted, a certain amount of the solid-liquid mixture is put into the compression chamber again, and the plunger is advanced as in the previous case.
【００１２】[0012]
【発明が解決しようとする課題】ところが、上記のよう
なスクリュープレスにおいて、圧縮室の固液混合物は、
スクリュー軸の回転で圧縮室に送り込まれてくる後続の
固液混合物で押されて圧縮されるだけであるので、圧縮
室は、圧縮比が低く、脱水力が低い。However, in the screw press as described above, the solid-liquid mixture in the compression chamber is
The compression chamber has a low compression ratio and a low dewatering power because it is only pushed and compressed by the subsequent solid-liquid mixture fed into the compression chamber by the rotation of the screw shaft.
【００１３】また、固液混合物の供給を停止して運転を
終了する際、圧縮室に送り込まれてくる固液混合物がな
くなるので、圧縮室の固液混合物は、押し出されずに、
圧縮室に残る。運転終了後に圧縮室に残った固液混合物
は、腐敗して悪臭を放すことがある。また、固液混合物
は、乾燥して固化し、運転を再開しても、圧縮室から押
し出されないことがある。Further, when the supply of the solid-liquid mixture is stopped and the operation is terminated, the solid-liquid mixture fed into the compression chamber disappears, so that the solid-liquid mixture in the compression chamber is not extruded,
It remains in the compression chamber. The solid-liquid mixture remaining in the compression chamber after the operation may decompose and give off a bad odor. Further, the solid-liquid mixture may not be extruded from the compression chamber even when the solid-liquid mixture is dried and solidified and the operation is restarted.
【００１４】上記のようなプランジャプレスにおいて、
圧縮室の固液混合物は、前進するプランジャで押されて
圧縮されるので、圧縮室は、スクリュープレスの圧縮室
に比較して、圧縮比が高く、脱水力が高い。また、運転
を終了する際、圧縮室の脱水ケーキは、プランジャで押
し出され、圧縮室に残らない。In the plunger press as described above,
Since the solid-liquid mixture in the compression chamber is pushed and compressed by the advancing plunger, the compression chamber has a higher compression ratio and a higher dewatering force than the compression chamber of the screw press. Further, when the operation ends, the dehydrated cake in the compression chamber is pushed out by the plunger and does not remain in the compression chamber.
【００１５】ところが、固液混合物の供給は、スクリュ
ープレスにおけるような連続ではなく間欠であり、連続
運転ではなく完全なバッチ運転であるので、脱水処理能
率が低い。However, the supply of the solid-liquid mixture is intermittent rather than continuous as in a screw press, and is not a continuous operation but a complete batch operation, so that the dehydration treatment efficiency is low.
【００１６】更に、圧縮室は、円柱形状であって、中心
部からスクリーン筒の小孔または開閉蓋の小孔までの距
離が長いので、圧縮室の固液混合物は、中心部の液体が
閉じ込められ易く、絞り出され難い。Furthermore, since the compression chamber has a cylindrical shape and the distance from the center to the small hole of the screen cylinder or the small hole of the opening / closing lid is long, the solid-liquid mixture in the compression chamber is confined by the liquid in the center. It is easy to be squeezed and difficult to be squeezed out.
【００１７】また、圧縮室に投入した一定量の固液混合
物は、プランジャで押されるだけであるので、後続の固
液混合物が連続して自転しつつ公転して送り込まれるス
クリュープレスの圧縮室の固液混合物に比較して、圧縮
中の流動が少なく、液体が流動し難く、絞り出され難
い。Further, since a fixed amount of the solid-liquid mixture introduced into the compression chamber is only pushed by the plunger, the subsequent solid-liquid mixture continuously rotates and revolves around and is fed into the compression chamber of the screw press. Compared with a solid-liquid mixture, the flow during compression is small, the liquid does not flow easily, and it is difficult to squeeze out.
【００１８】結局、スクリュープレスにおいては、圧縮
室の脱水力が低く、運転の終了後に圧縮室に固液混合物
が残る。プランジャプレスにおいては、脱水処理能率が
低く、脱水力が高くはない。After all, in the screw press, the dehydration power of the compression chamber is low, and the solid-liquid mixture remains in the compression chamber after the operation is completed. In the plunger press, the dewatering efficiency is low and the dewatering power is not high.
【００１９】[0019]
【課題を解決するための手段】本発明は、液体透過性筒
にスクリュー軸を嵌合し、スクリュー軸の回転駆動装置
を設け、液体透過性筒とスクリュー軸の羽根付き部分の
間に螺旋状の移送圧縮通路を形成し、液体透過性筒とス
クリュー軸の羽根なし部分の間に円環形状ないし円筒形
状の圧縮室を形成しており、スクリュー軸を回転し、移
送圧縮通路に固液混合物を供給し、固液混合物をスクリ
ュー軸の回転で移送圧縮通路を経て圧縮室に送り込み、
圧縮室の固液混合物を、圧縮室に送り込まれてくる後続
の固液混合物で押して圧縮し、圧縮室から押し出す脱水
プレスにおいて、回転中のスクリュー軸をその軸芯方向
に前後進する移動装置を設け、スクリュー軸の前進と後
退を制御する制御装置を設け、 スクリュー軸の回転で固
液混合物が圧縮室に充填されると、回転中のスクリュー
軸を前進させ、圧縮室の固液混合物を、圧縮室に送り込
まれてくる後続の固液混合物で押して圧縮すると共に、
回転しつつ前進するスクリュー軸で押して圧縮する構成
にし、 スクリュー軸の回転前進で圧縮室の固液混合物が
圧縮された後、回転中のスクリュー軸を後退させ、回転
中のスクリュー軸が前進と後退を繰り返す構成にした。According to the present invention, a screw shaft is fitted in a liquid permeable cylinder, a rotary drive device for the screw shaft is provided, and a spiral shape is provided between the liquid permeable cylinder and the bladed portion of the screw shaft. transferring compression passage is formed, annular shape or a cylindrical between the blades without part of the liquid-permeable cylinder and the screw shaft of the
-Shaped compression chamber is formed , and the screw shaft is rotated and transferred.
The solid-liquid mixture is supplied to the sending / compressing passage to screen it.
It is sent to the compression chamber through the transfer compression passage by the rotation of the axis .
In the dewatering press that pushes the solid-liquid mixture in the compression chamber with the subsequent solid-liquid mixture fed into the compression chamber to compress it and pushes it out of the compression chamber, a moving device that moves the rotating screw shaft back and forth in the axial direction Provided, forward and backward of the screw shaft
A control device to control the retreat is provided, and the screw shaft rotates to
Once the liquid mixture is filled in the compression chamber, the screw
While advancing the shaft, the solid-liquid mixture in the compression chamber is pressed and compressed by the subsequent solid-liquid mixture fed into the compression chamber,
A configuration to compress and press a screw shaft for advancing while rotating, the solid-liquid mixture in the compression chamber at the rotational advancement of the screw shaft
After being compressed, the rotating screw shaft is retracted and rotated.
The screw shaft inside is configured to repeat forward and backward movements .
【００２０】また、上記の液体透過性筒は、スクリュー
軸の後退時に、スクリュー軸の羽根の後側の固液混合物
が逃げ込む空間を設けた。 Further, the liquid permeable cylinder has a space in which the solid-liquid mixture escapes on the rear side of the blade of the screw shaft when the screw shaft is retracted .
【００２１】また、上記のスクリュー軸の前進と後退を
制御する制御装置は、スクリュー軸の前進速度が調整可
能であり、スクリュー軸の後退速度が前進速度より高速
度になる装置である。[0021] In addition, the backward and forward above the screw shaft
The control device for controlling is a device capable of adjusting the forward speed of the screw shaft so that the backward speed of the screw shaft becomes higher than the forward speed.
【００２２】また、上記のスクリュー軸の回転駆動装置
は、スクリュー軸の前進時の回転速度が調整可能であ
り、スクリュー軸の後退時の回転速度が前進時より高速
度になる装置である。The screw shaft rotation drive device is a device in which the rotation speed of the screw shaft during forward movement can be adjusted, and the rotation speed of the screw shaft during backward movement is higher than that during forward movement.
【００２３】[0023]
【発明の効果】圧縮室の固液混合物は、圧縮室に送り込
まれてくる後続の固液混合物で押されて圧縮されると共
に、回転しつつ前進するスクリュー軸で押されて圧縮さ
れるので、圧縮室は、従来のスクリュープレスの圧縮室
に比較して、圧縮比が高く、脱水力が高い。Since the solid-liquid mixture in the compression chamber is pushed and compressed by the subsequent solid-liquid mixture fed into the compression chamber, it is pushed and compressed by the screw shaft moving forward while rotating. The compression chamber has a higher compression ratio and a higher dewatering force than the compression chamber of the conventional screw press.
【００２４】また、運転を終了する際、固液混合物の移
送圧縮通路への供給を停止し、スクリュー軸を回転しつ
つ前進させる。圧縮室の固液混合物は、スクリュー軸で
押し出され、圧縮室に残らない。When the operation is finished, the supply of the solid-liquid mixture to the transfer compression passage is stopped and the screw shaft is advanced while rotating. The solid-liquid mixture in the compression chamber is pushed out by the screw shaft and does not remain in the compression chamber.
【００２５】スクリュー軸の後退時には、スクリュー軸
の前進による固液混合物の圧縮が中断されるが、固液混
合物の移送圧縮通路への供給は、中断せずに連続して行
なうことができるので、脱水処理能率を高めることがで
きる。When the screw shaft is retracted, the compression of the solid-liquid mixture due to the forward movement of the screw shaft is interrupted, but the supply of the solid-liquid mixture to the transfer compression passage can be continuously performed without interruption. The efficiency of dehydration treatment can be increased.
【００２６】更に、圧縮室は、円環形状ないし円筒形状
になるので、従来のプランジャプレスの円柱形状の圧縮
室に比較して、圧縮室の固液混合物は、液体が閉じ込め
られ難く、絞り出され易い。Further, since the compression chamber has an annular shape or a cylindrical shape, the solid-liquid mixture in the compression chamber is less likely to contain the liquid and is squeezed out as compared with the cylindrical compression chamber of the conventional plunger press. It is easy to be affected.
【００２７】また、圧縮室は、圧縮中に後続の固液混合
物が連続して自転しつつ公転して送り込まれるので、圧
縮室の固液混合物は、従来のプランジャプレスの圧縮室
の固液混合物に比較して、圧縮中の流動が多く、液体が
流動し易く、絞り出され易い。Further, in the compression chamber, since the subsequent solid-liquid mixture is continuously revolved and fed while being compressed, the solid-liquid mixture in the compression chamber is the solid-liquid mixture in the compression chamber of the conventional plunger press. Compared with, the flow during compression is large, and the liquid easily flows and is easily squeezed out.
【００２８】結局、圧縮室の脱水力が高い。運転の終了
後に圧縮室に固液混合物が残らない。脱水処理能率が高
い。After all, the decompression power of the compression chamber is high. No solid-liquid mixture remains in the compression chamber after the end of operation. High efficiency of dehydration treatment.
【００２９】[0029]
【発明の実施の形態】＜構 成＞
脱水プレスは、図１に示すように、機台１の上に円筒形
状のスクリーン筒２を水平に配置して固定し、スクリー
ン筒２にスクリュー軸３を回転可能かつ軸芯方向に移動
可能に同芯状に嵌合している。スクリーン筒２は、周壁
に多数の小孔４を貫通している。スクリュー軸３は、中
央部に羽根５を螺旋状に巻き付けている。BEST MODE FOR CARRYING OUT THE INVENTION <Structure> As shown in FIG. 1, a dewatering press has a cylindrical screen cylinder 2 horizontally arranged and fixed on a machine base 1, and a screw shaft 3 is attached to the screen cylinder 2. Are concentrically fitted so as to be rotatable and movable in the axial direction. The screen tube 2 has a large number of small holes 4 formed in its peripheral wall. The blade 5 is spirally wound around the central portion of the screw shaft 3.
【００３０】機台１の上には、可動台６をスクリュー軸
３の軸芯方向に沿って移動可能に設けている。可動台６
の上には、前側軸受板７と後側軸受板８を設立し、前側
軸受板７と後側軸受板８に、スクリーン筒２の閉鎖端板
から突出したスクリュー軸３の小径端部を径方向と軸芯
方向に軸受している。A movable base 6 is provided on the machine base 1 so as to be movable in the axial direction of the screw shaft 3. Movable table 6
A front bearing plate 7 and a rear bearing plate 8 are established on the above, and a small-diameter end portion of the screw shaft 3 protruding from the closed end plate of the screen cylinder 2 is attached to the front bearing plate 7 and the rear bearing plate 8. Bearings in both axial and axial directions.
【００３１】後側軸受板８の上には、減速機付きの電動
機９を取り付け、電動機９の回転軸とスクリュー軸３の
小径端部をチェン伝動機構１０で連結して、スクリュー
軸３の回転駆動装置を可動台６の上に構成している。こ
の回転駆動装置は、電動機９の回転制御装置を付設して
いる。この回転制御装置は、電動機９の回転速度即ちス
クリュー軸３の回転速度を制御するインバータ装置であ
る。An electric motor 9 with a speed reducer is mounted on the rear bearing plate 8, and the rotating shaft of the electric motor 9 and the small diameter end of the screw shaft 3 are connected by a chain transmission mechanism 10 to rotate the screw shaft 3. The drive device is constructed on the movable table 6. This rotation drive device is additionally provided with a rotation control device for the electric motor 9. This rotation control device is an inverter device that controls the rotation speed of the electric motor 9, that is, the rotation speed of the screw shaft 3.
【００３２】機台１の上には、固定板１１を設立し、固
定板１１に油圧シリンダ１２を可動台６の移動方向に沿
って固定し、油圧シリンダ１２の先端から突出したピス
トンロッド１３の先端を後側軸受板８に連結して、スク
リュー軸３の移動装置を構成している。ピストンロッド
１３を前進または後進すると、可動台６が軸受板７，
８、スクリュー軸３の回転駆動装置９，１０と一緒に前
進または後進し、スクリュー軸３が前進または後進す
る。A fixed plate 11 is installed on the machine base 1, a hydraulic cylinder 12 is fixed to the fixed plate 11 along the moving direction of the movable table 6, and a piston rod 13 protruding from the tip of the hydraulic cylinder 12 is fixed. The tip end is connected to the rear bearing plate 8 to form a moving device for the screw shaft 3. When the piston rod 13 is moved forward or backward, the movable base 6 moves the bearing plate 7,
8. The screw shaft 3 moves forward or backward together with the rotation driving devices 9 and 10 for the screw shaft 3, and the screw shaft 3 moves forward or backward.
【００３３】スクリュー軸３の移動装置は、油圧シリン
ダ装置１２，１３の制御装置を付設している。この制御
装置は、ピストンロッド１３の前進と後進即ちスクリュ
ー軸３の前進と後進を制御する油圧回路である。スクリ
ュー軸３の前進速度と後退速度は、それぞれ、調整可能
にし、スクリュー軸３の後退速度を前進速度の数倍の高
速度に調整可能にしている。The moving device for the screw shaft 3 is additionally provided with a control device for the hydraulic cylinder devices 12, 13. This control device is a hydraulic circuit that controls the forward and backward movements of the piston rod 13, that is, the forward and backward movements of the screw shaft 3. The forward speed and the backward speed of the screw shaft 3 can be adjusted respectively, and the backward speed of the screw shaft 3 can be adjusted to a high speed which is several times higher than the forward speed.
【００３４】また、電動機９の回転制御装置は、スクリ
ュー軸３の回転速度を、スクリュー軸３の前進時と後退
時では別々に設定可能にし、スクリュー軸３の後退時の
回転速度を前進時の数倍の高速度に設定可能にしてい
る。The rotation control device for the electric motor 9 can set the rotation speed of the screw shaft 3 separately when the screw shaft 3 moves forward and backward, and the rotation speed of the screw shaft 3 when moving backward can be set. The speed can be set several times higher.
【００３５】スクリーン筒２とスクリュー軸３の羽根５
付き部分の間には、図１に示すように、固液混合物を移
送しつつ圧縮する螺旋状の移送圧縮通路１４を形成して
いる。移送圧縮通路１４は、入口側より出口側の断面積
を小さくしている。スクリーン筒２の閉鎖端板側の上部
には、固液混合物を供給する供給口１５を設けている。
供給口１５は、移送圧縮通路１４の入口側に接続してい
る。The screen cylinder 2 and the blade 5 of the screw shaft 3
Between the attached portions, as shown in FIG. 1, a spiral transfer compression passage 14 for compressing while transferring the solid-liquid mixture is formed. The transfer compression passage 14 has a smaller cross-sectional area on the outlet side than on the inlet side. A supply port 15 for supplying the solid-liquid mixture is provided in the upper part of the screen tube 2 on the closed end plate side.
The supply port 15 is connected to the inlet side of the transfer compression passage 14.
【００３６】スクリーン筒２とスクリュー軸３の羽根５
なし大径部分の間には、移送圧縮通路１４を通過した固
液混合物を更に圧縮する四角形断面の円環形状ないし円
筒形状の圧縮室１６を形成している。圧縮室１６は、移
送圧縮通路１４の出口を入口とし、スクリーン筒２の開
口端を出口としている。The screen cylinder 2 and the blade 5 of the screw shaft 3
Between the large-diameter portions, there is formed an annular or cylindrical compression chamber 16 having a rectangular cross section for further compressing the solid-liquid mixture that has passed through the transfer compression passage 14. The compression chamber 16 has an outlet of the transfer compression passage 14 as an inlet and an opening end of the screen cylinder 2 as an outlet.
【００３７】スクリーン筒２の下には、固液混合物から
分離してスクリーン筒２の小孔４から流出する液体を集
める受け皿１７を設けている。Below the screen cylinder 2, there is provided a tray 17 for collecting the liquid separated from the solid-liquid mixture and flowing out from the small holes 4 of the screen cylinder 2.
【００３８】機台１の上には、軸受板１８を設立し、軸
受板１８に、スクリーン筒２の開口端から突出したスク
リュー軸３の大径端部を径方向にのみ軸受している。A bearing plate 18 is established on the machine base 1, and the large-diameter end portion of the screw shaft 3 projecting from the opening end of the screen cylinder 2 is supported on the bearing plate 18 only in the radial direction.
【００３９】スクリュー軸３の大径端部には、三角形断
面の円環形状の抵抗体１９を嵌合して軸受板１８とスク
リーン筒２の間で軸芯方向に移動可能にしている。抵抗
体１９は、圧縮室１６の出口に対面し、圧縮室１６との
間の距離に応じて圧縮室１６の流出抵抗を増減する。An annular resistor 19 having a triangular cross section is fitted to the large-diameter end of the screw shaft 3 so as to be movable between the bearing plate 18 and the screen cylinder 2 in the axial direction. The resistor 19 faces the outlet of the compression chamber 16 and increases or decreases the outflow resistance of the compression chamber 16 according to the distance between the resistor 19 and the compression chamber 16.
【００４０】軸受板１８には、複数の油圧シリンダ２０
を抵抗体１９の移動方向に沿って固定し、油圧シリンダ
２０のピストンロッド２１を軸受板１８に貫通し、ピス
トンロッド２１の先端を抵抗体１９に連結し、ピストン
ロッド２１即ち抵抗体１９の前進、後進と停止位置を制
御する油圧回路を設けて、抵抗体１９の位置変更装置を
構成している。The bearing plate 18 has a plurality of hydraulic cylinders 20.
Is fixed along the moving direction of the resistor 19, the piston rod 21 of the hydraulic cylinder 20 is penetrated through the bearing plate 18, the tip of the piston rod 21 is connected to the resistor 19, and the piston rod 21, that is, the resistor 19 is moved forward. A hydraulic circuit for controlling the reverse and stop positions is provided to form a position changing device for the resistor 19.
【００４１】抵抗体１９と圧縮室１６出口の下には、圧
縮室１６の出口から抵抗体１９によって抵抗を受けつつ
流出する脱水ケーキの落下路２２を設けている。Below the resistor 19 and the outlet of the compression chamber 16, there is provided a drop passage 22 for the dehydrated cake that flows out from the outlet of the compression chamber 16 while receiving resistance from the resistor 19.
【００４２】スクリーン筒２の閉鎖端板と供給口１５の
間の上部には、スクリュー軸３の後退時に、スクリーン
筒２の閉鎖端板とスクリュー軸３の羽根５の間の固液混
合物が逃げ込む空間２３を設けている。When the screw shaft 3 is retracted, the solid-liquid mixture between the closed end plate of the screen cylinder 2 and the blades 5 of the screw shaft 3 escapes into the upper part between the closed end plate of the screen cylinder 2 and the supply port 15. A space 23 is provided.
【００４３】＜作 用＞
この脱水プレスを運転する場合、図１に示すように、ス
クリュー軸３が後退端に位置し、抵抗体１９が前進端に
位置して圧縮室１６の流出抵抗が非常に大きい状態で、
スクリュー軸３を回転し、供給口１５に、固形物と液体
が混合した固液混合物、実施例では廃水汚泥、を連続し
て供給する。<Operation> When this dewatering press is operated, as shown in FIG. 1, the screw shaft 3 is located at the backward end and the resistor 19 is located at the forward end so that the outflow resistance of the compression chamber 16 is extremely low. In a big state,
The screw shaft 3 is rotated, and a solid-liquid mixture in which a solid and a liquid are mixed, in the embodiment, wastewater sludge, is continuously supplied to the supply port 15.
【００４４】すると、移送圧縮通路１４の入口に流入す
る固液混合物は、スクリュー軸３の回転によって、移送
圧縮通路１４を自転しつつスクリュー軸３の回りを公転
して螺旋状に移送され、その間に圧縮されて、圧縮室１
６に送り込まれる。Then, the solid-liquid mixture flowing into the inlet of the transfer compression passage 14 is revolved around the screw shaft 3 while rotating around the transfer compression passage 14 by the rotation of the screw shaft 3, and is transferred in a spiral shape. Compressed into the compression chamber 1
Sent to 6.
【００４５】圧縮室１６に固液混合物が充填されて回転
中のスクリュー軸３のトルクが予め設定した値に達する
と、スクリュー軸３の移動装置が前進作動し、図２に示
すように、回転中のスクリュー軸３が予め設定した前進
時の回転速度で予め設定した前進速度で前進し始める。When the compression chamber 16 is filled with the solid-liquid mixture and the torque of the rotating screw shaft 3 reaches a preset value, the moving device of the screw shaft 3 moves forward to rotate the screw shaft 3 as shown in FIG. The screw shaft 3 therein starts to move forward at a preset forward moving speed at a preset forward rotating speed.
【００４６】移送圧縮通路１４を通過中に圧縮されて含
水率が低下した圧縮室１６の固液混合物は、更に、圧縮
室１６に送り込まれてくる後続の固液混合物で押されて
圧縮されると共に、回転しつつ前進するスクリュー軸３
の羽根５で押されて圧縮される。固液混合物は、含水率
が更に低下して脱水ケーキになる。The solid-liquid mixture in the compression chamber 16 which has been compressed while passing through the transfer compression passage 14 and has a reduced water content is further pushed and compressed by the subsequent solid-liquid mixture fed into the compression chamber 16. Along with, the screw shaft 3 that moves forward while rotating
The blades 5 are pressed and compressed. The solid-liquid mixture has a further reduced water content and becomes a dehydrated cake.
【００４７】圧縮室１６の固液混合物は、後続の固液混
合物で押されて圧縮されると共に、スクリュー軸３の羽
根５で押されて圧縮されるので、圧縮室１６は、圧縮比
が高く、脱水力が高い。更に、固液混合物は、移送圧縮
通路１４で圧縮され、その上、圧縮室１６で圧縮される
ので、脱水力が非常に高い。Since the solid-liquid mixture in the compression chamber 16 is pushed and compressed by the subsequent solid-liquid mixture and is pushed and compressed by the blades 5 of the screw shaft 3, the compression chamber 16 has a high compression ratio. , High dehydration power. Further, the solid-liquid mixture is compressed in the transfer compression passage 14 and further compressed in the compression chamber 16, so that the dehydration power is very high.
【００４８】固液混合物から分離した液体は、スクリー
ン筒２の小孔４から流出する。圧縮室１６の脱水ケーキ
は、圧縮室１６の出口から抵抗体１９によって抵抗を受
けつつ流出する。The liquid separated from the solid-liquid mixture flows out through the small hole 4 of the screen cylinder 2. The dehydrated cake in the compression chamber 16 flows out from the outlet of the compression chamber 16 while receiving resistance from the resistor 19.
【００４９】抵抗体１９は、圧縮室１６の出口から流出
する脱水ケーキから後退方向に力を受け、その後退力が
予め設定した上限値を上回ると、図２に示すように、後
退して圧縮室１６との間の距離を拡大し、圧縮室１６の
流出抵抗を減少する。逆に、その後退力が予め設定した
下限値を下回ると、前進して圧縮室１６との間の距離を
縮小し、圧縮室１６の流出抵抗を増加する。抵抗体１９
の位置即ち圧縮室１６の流出抵抗は、抵抗体１９の位置
変更装置によって、予め設定した範囲内に制御される。The resistor 19 receives a force in the backward direction from the dehydrated cake flowing out from the outlet of the compression chamber 16, and when the backward force exceeds a preset upper limit value, the resistor 19 moves backward and is compressed, as shown in FIG. The distance to the chamber 16 is increased and the outflow resistance of the compression chamber 16 is reduced. On the contrary, when the retreating force falls below the preset lower limit value, it moves forward to reduce the distance to the compression chamber 16 and increase the outflow resistance of the compression chamber 16. Resistor 19
The position, that is, the outflow resistance of the compression chamber 16 is controlled within a preset range by the position changing device of the resistor 19.
【００５０】スクリュー軸３が更に前進し、図３に示す
ように、前進端に達すると、スクリュー軸３の移動装置
が後退作動し、回転中のスクリュー軸３は、その回転速
度を前進時の数倍の高速度にしつつ、前進速度の数倍の
高速度で後退する。すると、スクリーン筒２の閉鎖端板
とスクリュー軸３の羽根５の間の固液混合物は、空間２
３に逃げ込む。スクリュー軸３が後退し易い。抵抗体１
９は、その後退力が下限値を下回り、前進する。When the screw shaft 3 further advances and reaches the forward end as shown in FIG. 3, the moving device of the screw shaft 3 operates backward, and the rotating screw shaft 3 has its rotational speed at the time of forward movement. While increasing the speed several times, it moves backward at a speed several times faster than the forward speed. Then, the solid-liquid mixture between the closed end plate of the screen cylinder 2 and the blade 5 of the screw shaft 3 becomes
Run into 3. The screw shaft 3 is easily retracted. Resistor 1
In No. 9, the retreating force is below the lower limit value and the vehicle moves forward.
【００５１】スクリュー軸３が後退端に達し、圧縮室１
６に固液混合物が充填されて回転中のスクリュー軸３の
トルクが設定値に達すると、スクリュー軸３は、その回
転速度を前進時の速度に戻しつつ、前進速度で再び前進
し始める。When the screw shaft 3 reaches the backward end, the compression chamber 1
When 6 is filled with the solid-liquid mixture and the torque of the rotating screw shaft 3 reaches the set value, the screw shaft 3 starts moving forward again at the forward speed while returning the rotation speed to the forward speed.
【００５２】すると、前回と同様に、固液混合物は、移
送圧縮通路１４を移送される間に圧縮されて圧縮室１６
に送り込まれ、圧縮室１６を移送される間に、後続の固
液混合物で押されて圧縮されると共に、回転しつつ前進
するスクリュー軸３の羽根５で押されて圧縮され、脱水
ケーキになる。Then, similarly to the previous time, the solid-liquid mixture is compressed while being transferred through the transfer compression passage 14 and compressed in the compression chamber 16
While being transferred to the compression chamber 16 and transferred to the compression chamber 16, it is pressed and compressed by the subsequent solid-liquid mixture and also compressed by the blades 5 of the screw shaft 3 that is rotating and advancing to become a dehydrated cake. .
【００５３】固液混合物が供給口１５に連続して供給さ
れる一方、スクリュー軸３が回転前進と高速回転高速後
退を繰り返し、スクリュー軸３の前進時に圧縮室１６か
ら脱水ケーキが流出する。While the solid-liquid mixture is continuously supplied to the supply port 15, the screw shaft 3 repeats rotation forward and high speed rotation high speed retreat, and the dehydrated cake flows out from the compression chamber 16 when the screw shaft 3 advances.
【００５４】スクリュー軸３の後退時には、スクリュー
軸３の前進による固液混合物の圧縮が中断されるが、固
液混合物の供給は、中断せずに連続して行なわれるの
で、脱水処理能率が高い。更に、スクリュー軸３は、後
退時に、高速度で回転しつつ、高速度で後退するので、
脱水処理能率が非常に高い。When the screw shaft 3 retreats, the compression of the solid-liquid mixture due to the forward movement of the screw shaft 3 is interrupted, but the solid-liquid mixture is continuously supplied without interruption, so that the dehydration treatment efficiency is high. . Furthermore, since the screw shaft 3 retreats at a high speed while rotating at a high speed at the time of retreat,
The dehydration efficiency is very high.
【００５５】脱水プレスの運転を終了する場合、固液混
合物の供給を停止し、抵抗体１９を後退させ、スクリュ
ー軸３を後退端から回転しつつ前進させる。When the operation of the dewatering press is finished, the supply of the solid-liquid mixture is stopped, the resistor 19 is retracted, and the screw shaft 3 is advanced while rotating from the retracted end.
【００５６】すると、抵抗体１９は、図４に示すよう
に、後退端に達し、圧縮室１６の流出抵抗がほとんど零
になる。移送圧縮通路１４の固液混合物は、圧縮室１６
に送り込まれる。圧縮室１６の固液混合物は、圧縮室１
６から押し出される。スクリュー軸３は、図４に示すよ
うに、前進端に達する。移送圧縮通路１４の固液混合物
は、排出されて移送圧縮通路１４に残らない。圧縮室１
６の固液混合物は、排出されて圧縮室１６に残らない。Then, the resistor 19 reaches the retracted end, as shown in FIG. 4, and the outflow resistance of the compression chamber 16 becomes almost zero. The solid-liquid mixture in the transfer compression passage 14 is transferred to the compression chamber 16
Sent to. The solid-liquid mixture in the compression chamber 16 is
Extruded from 6. The screw shaft 3 reaches the forward end as shown in FIG. The solid-liquid mixture in the transfer compression passage 14 is discharged and does not remain in the transfer compression passage 14. Compression chamber 1
The solid-liquid mixture of 6 is discharged and does not remain in the compression chamber 16.
【００５７】＜変形例＞
１）上記の脱水プレスにおいては、液体透過性筒は、液
体が通過する多数の小孔４が貫通した金属板を、スクリ
ュー軸３を嵌合する円筒形状に湾曲したスクリーン筒２
であるが、スクリュー軸３を嵌合する孔が貫通した多数
の板を、液体が通過する隙間を設けて並列した多重板の
筒状体にする。<Modifications> 1) In the above dewatering press, the liquid permeable cylinder is formed by bending a metal plate through which a large number of small holes 4 through which the liquid passes into a cylindrical shape into which the screw shaft 3 is fitted. Screen tube 2
However, a large number of plates, through which holes for fitting the screw shafts 3 penetrate, are formed in parallel to form a multi-plate cylindrical body with a gap through which liquid passes.
【００５８】２）上記の脱水プレスにおいては、スクリ
ュー軸３の移動装置は、油圧シリンダ装置１２，１３を
用いているが、螺軸を前後進するねじ機構を用いる。 2) In the above dewatering press, the moving device for the screw shaft 3 uses the hydraulic cylinder devices 12 and 13, but uses a screw mechanism for moving the screw shaft forward and backward .
【図１】本発明の実施形態の脱水プレスの一部縦断側面
図。FIG. 1 is a partially longitudinal side view of a dewatering press according to an embodiment of the present invention.
【図２】同脱水プレスのスクリュー軸が前進中の状態を
示す一部縦断側面図。FIG. 2 is a partially longitudinal side view showing a state where a screw shaft of the dewatering press is moving forward.
【図３】同脱水プレスのスクリュー軸が前進端に達した
状態を示す一部縦断側面図。FIG. 3 is a partially longitudinal side view showing a state where the screw shaft of the dewatering press reaches the forward end.
【図４】同脱水プレスの運転を終了する際、スクリュー
軸が前進端に達した状態を示す一部縦断側面図。FIG. 4 is a partial vertical cross-sectional side view showing a state where the screw shaft reaches the forward end when the operation of the dewatering press is finished.
２ スクリーン筒，液体透過性筒
３ スクリュー軸
５ 羽根
９，１０ スクリュー軸の回転駆動装置
６，７，８，１１，１２，１３ スクリュー軸の移動装
置
１４ 移送圧縮通路
１６ 圧縮室
２３ 固液混合物の逃げ込み空間2 screen cylinder, a liquid permeable tube 3 screw shaft 5 blade 9 and 10 mobile unit 14 transfer the compression communication channel 16 the compression chamber 23 the solid-liquid mixture of the rotary drive 6,7,8,11,12,13 screw shaft of the screw shaft Escape space
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−241696（ＪＰ，Ａ) 特開 平11−320192（ＪＰ，Ａ) 実開 昭59−124687（ＪＰ，Ｕ) 実開 昭64−27195（ＪＰ，Ｕ) 実公 昭41−5505（ＪＰ，Ｙ１) 実公 昭41−5506（ＪＰ，Ｙ１) (58)調査した分野(Int.Cl.7，ＤＢ名) B30B 9/14 B30B 9/12 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-2-241696 (JP, A) JP-A-11-320192 (JP, A) Actually open 59-124687 (JP, U) Actually open 64- 27195 (JP, U) Actual public Sho 41-5505 (JP, Y1) Actual public Sho 41-5506 (JP, Y1) (58) Fields investigated (Int.Cl. 7 , DB name) B30B 9/14 B30B 9 / 12
Claims (4)
スクリュー軸の回転駆動装置を設け、液体透過性筒とス
クリュー軸の羽根付き部分の間に螺旋状の移送圧縮通路
を形成し、液体透過性筒とスクリュー軸の羽根なし部分
の間に円環形状ないし円筒形状の圧縮室を形成してお
り、スクリュー軸を回転し、移送圧縮通路に固液混合物
を供給し、固液混合物をスクリュー軸の回転で移送圧縮
通路を経て圧縮室に送り込み、圧縮室の固液混合物を、
圧縮室に送り込まれてくる後続の固液混合物で押して圧
縮し、圧縮室から押し出す脱水プレスにおいて、 回転中のスクリュー軸をその軸芯方向に前後進する移動
装置を設け、スクリュー軸の前進と後退を制御する制御
装置を設け、 スクリュー軸の回転で固液混合物が圧縮室に充填される
と、回転中のスクリュー軸を前進させ、 圧縮室の固液混
合物を、圧縮室に送り込まれてくる後続の固液混合物で
押して圧縮すると共に、回転しつつ前進するスクリュー
軸で押して圧縮する構成にし、 スクリュー軸の回転前進で圧縮室の固液混合物が圧縮さ
れた後、回転中のスクリュー軸を後退させ、回転中のス
クリュー軸が前進と後退を繰り返す構成にした ことを特
徴とする脱水プレス。1. A screw shaft is fitted to a liquid-permeable cylinder,
A screw shaft rotation drive is provided, and a spiral transfer compression passage is formed between the liquid permeable cylinder and the blade-free portion of the screw shaft, and an annular shape is formed between the liquid permeable cylinder and the blade-free portion of the screw shaft. to contact to form a compression chamber of cylindrical
Ri, and rotating the screw shaft, the solid-liquid mixture to a transfer compression passage
Supplies, feed the solid-liquid mixture into the compression chamber through the transfer compression <br/> passage by the rotation of the screw shaft, a solid-liquid mixture in the compression chamber,
In the dewatering press that pushes and compresses with the subsequent solid-liquid mixture sent to the compression chamber, and pushes out from the compression chamber, a moving device that moves the rotating screw shaft forward and backward in the axial direction is provided, and the screw shaft moves forward and backward. Control to control
The device is installed and the solid-liquid mixture is filled in the compression chamber by the rotation of the screw shaft.
Then, the screw shaft during rotation is moved forward, and the solid-liquid mixture in the compression chamber is pressed by the subsequent solid-liquid mixture fed into the compression chamber to be compressed, and the screw shaft moving forward while rotating is pressed and compressed. , The forward rotation of the screw shaft compresses the solid-liquid mixture in the compression chamber.
The rotating screw shaft is retracted,
A dewatering press with a structure in which the clew shaft repeats forward and backward movements .
に、スクリュー軸の羽根の後側の固液混合物が逃げ込む
空間を設けたことを特徴とする請求項１に記載の脱水プ
レス。2. The dewatering press according to claim 1, wherein the liquid permeable cylinder is provided with a space into which the solid-liquid mixture on the rear side of the blade of the screw shaft escapes when the screw shaft is retracted.
御装置は、スクリュー軸の前進速度が調整可能であり、
スクリュー軸の後退速度が前進速度より高速度になる装
置であることを特徴とする請求項１または２に記載の脱
水プレス。3. A control for controlling forward and backward movement of a screw shaft.
The control device can adjust the forward speed of the screw shaft,
The dewatering press according to claim 1 or 2 , which is a device in which the backward speed of the screw shaft is higher than the forward speed.
ュー軸の前進時の回転速度が調整可能であり、スクリュ
ー軸の後退時の回転速度が前進時より高速度になる装置
であることを特徴とする請求項１、２または３に記載の
脱水プレス。4. The screw shaft rotation drive device is a device capable of adjusting the rotation speed when the screw shaft moves forward, and the rotation speed when the screw shaft moves backward is higher than that when moving forward. The dewatering press according to claim 1, 2 or 3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16351198A JP3373432B2 (en) | 1998-06-11 | 1998-06-11 | Dehydration press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16351198A JP3373432B2 (en) | 1998-06-11 | 1998-06-11 | Dehydration press |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11347796A JPH11347796A (en) | 1999-12-21 |
| JP3373432B2 true JP3373432B2 (en) | 2003-02-04 |
Family
ID=15775262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16351198A Expired - Lifetime JP3373432B2 (en) | 1998-06-11 | 1998-06-11 | Dehydration press |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3373432B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5225190B2 (en) * | 2009-04-28 | 2013-07-03 | 水ｉｎｇ株式会社 | Screw press-type sludge dewatering device and operation method thereof |
| CN104589688A (en) * | 2015-01-16 | 2015-05-06 | 浙江中科兴环能设备有限公司 | Viscous residue spiral squeeze feeder |
| JP6466366B2 (en) * | 2016-05-17 | 2019-02-06 | 水ｉｎｇ株式会社 | Sludge dewatering device and cleaning method thereof |
| CN112057950B (en) * | 2020-09-14 | 2021-07-02 | 深圳市升源园林生态有限公司 | River course rubbish pollution treatment filtration system |
| CN114311806A (en) * | 2021-12-24 | 2022-04-12 | 山东晨钟机械股份有限公司 | Screw press for squeezing and dewatering viscous materials |
| CN114198988B (en) * | 2021-12-29 | 2022-10-25 | 双胞胎（集团）股份有限公司 | A dewatering system for domestic animal feed ingredient |
-
1998
- 1998-06-11 JP JP16351198A patent/JP3373432B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11347796A (en) | 1999-12-21 |
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