JP4054954B2

JP4054954B2 - Cake pump

Info

Publication number: JP4054954B2
Application number: JP2001265260A
Authority: JP
Inventors: 謙三菅谷
Original assignee: Ishigaki Co Ltd
Current assignee: Ishigaki Co Ltd
Priority date: 2001-09-03
Filing date: 2001-09-03
Publication date: 2008-03-05
Anticipated expiration: 2021-09-03
Also published as: JP2003074463A

Description

【０００１】
【発明の属する技術分野】
この発明は、汚泥等のケーキ圧送ポンプに関し、特に、ケーキ供給用のオーガーの油圧モーターに圧入した駆動油を利用して、圧送ピストンシリンダーを作動させる装置に関する。
【０００２】
【従来の技術】
従来、ピストン型の圧送ポンプは、例えば、特開昭６２−１４７０５４号公報に記載してあるようにダブルシリンダー型が一般に使用されている。このダブルシリンダー型の油圧シリンダーの駆動は、油圧ポンプを使用しているが、一対のシリンダーに交互に油を送るため、油圧動力と油圧タンクの削減につながっている。また、例えば、特開平７−３３２２３０号公報に記載してあるように、ホッパーの下側にオーガーを備えた供給口に吸込バルブを対設し、この供給口を開閉させる輸送管に吸入・圧縮用の圧送ピストンシリンダーを内設したシングル型の圧送ピストンポンプも公知である。
【０００３】
【発明が解決しようとする課題】
上記従来のダブルシリンダー型の圧送ポンプは、シリンダーに交互に油を送るため、供給口でのバルブの開閉が頻繁となり耐久性に問題があった。また、シングル型では、断続的な圧送ポンプの作動のため、油圧の動力が増加して油圧タンクも大きくなる欠点があった。そして、ケーキ圧送ポンプには、ポンプにケーキを送込むためのオーガーやパドル等が必要であり、シングル型の場合には、これらも断続運転となる。これらの駆動はケーキ排出後の圧送ポンプのシリンダーを後退させて、ケーキを輸送管に吸入するときになされるものである。この発明は、シングル型のケーキ圧送ポンプの油圧を有効利用して、使用する油量を減少させる装置を提供する。
【０００４】
【課題を解決するための手段】
この発明の要旨は、ホッパーの下方に設けた吸入管をケーキの輸送管に連結し、吸入管の供給口に配設した吸入弁と輸送管に内設した吸入・輸送用の圧送ピストンシリンダーを連動させてケーキを輸送する圧送ポンプにおいて、上記吸入管に内設したオーガーに油圧モーターを配設し、この油圧モーターの駆動油の排出回路を圧送ピストンシリンダーのロッド側油室の吸入回路に連結して、油圧モーターの駆動油を圧送ピストンシリンダーのロッド側油室に供給すると共に、油圧モーターの駆動回路と圧送ピストンシリンダーのヘッド側油室の圧送回路を油槽に連通させたピストン作動弁にそれぞれ接続し、油槽から油圧モーターに油を圧入して、圧送ピストンシリンダーのヘッド側油室の油を油槽に排出させるもので、オーガーの油圧モーターの駆動油を利用して、圧送ピストンシリンダーを作動させるものである。
【０００５】
油圧モーターの駆動油の排出回路と、圧送ピストンシリンダーのロッド側油室への吸入回路の連結点に給排回路を連結し、この給排回路に流量調整弁と圧力調整弁を直列に配列してピストン作動弁に連通させて、圧送ピストンシリンダーのロッド側油室の不足する油圧を給排回路から吸入回路に補給すると共に、ピストン作動弁に接続した給排回路に逆止弁を介装した並列回路を分岐して、圧送ピストンシリンダーのロッド側油室から排出される油を並列回路から油槽に返送させるものである。
【０００６】
【発明の実施の形態】
この発明に係るケーキ圧送ポンプは上記のように構成してあり、ピストン作動弁を操作して供給回路から油圧モーターに油を圧入し、オーガーを回転させてホッパーに貯留したケーキを下部の開口から吸入管に落下させ、オーガーで供給口に向ってケーキを移送する。吸入管の供給口に配設した吸入弁シリンダーで吸入弁を開放すると同時に、油圧モーターの駆動油が圧送ピストンシリンダーのロッド側油室に供給され、圧送ピストンシリンダーのロッド側油室の不足する油圧を油槽から吸入回路に補給する。輸送管の端部に配設した吸入・輸送用の圧送ピストンシリンダーは、ロッド側油室の油圧で圧送ピストンを後退させて、開放した吸入管の供給口からケーキを輸送管に吸引する。次に、吸入管の供給口を吸入弁で閉止して、圧送ピストンシリンダーのヘッド側油室に油を圧入し、圧送ピストンを前進させて輸送管に吸引したケーキを圧送する。この操作を連続して繰返しケーキを輸送する。
【０００７】
【実施例】
この発明に係るケーキ圧送ポンプについて、図面に基づき詳述すると、図１は圧送ポンプであって、ホッパー１の下部に設けた開口１ａに吸入管２が連結してあり、吸入管２の後端の供給口３がケーキの輸送管４の周壁に連結してある。吸入管２には油圧モーター５を配設したオーガー６が内設してあり、ホッパー１の下部に設けた開口１ａに対設してある。そして、ホッパー１に供給したケーキをホッパー１の下端の開口１ａから吸入管２に落下させ、オーガー６を回転させて吸入管２の後端部に設けた供給口３の方向にケーキを移送するようにしてある。吸入管２の供給口３に吸入弁７が対設してあり、この吸入弁７に吸入弁シリンダー８のピストンロッド８ａが輸送管４を貫通して連結してある。そして、吸入弁シリンダー８のピストンロッド８ａを伸縮させて吸入弁７を移動させ、供給口３を開閉するようにしてある。吸入管２を連結した輸送管４の端部に吸入・輸送用の圧送ピストンシリンダー９が配設してあり、圧送ピストンシリンダー９に連結した圧送ピストン１０を後退させて、吸入弁７を開放した吸入管２の供給口３からケーキを輸送管４の端部に吸引するようにしてある。この輸送管４に吸入したケーキは、圧送ピストン１０を前進させて輸送するようにしてある。なお、符号１１は輸送管４の端部から圧送したケーキの逆流を防止する逆止弁である。
【０００８】
図２に示すように、オーガー６を作動させる油圧モーター５と圧送ピストンシリンダー９にピストン作動弁１２が配設してあり、油圧モーター５への油の駆動回路１３と圧送ピストンシリンダー９のヘッド側油室９ａに連結した圧送回路１４がピストン作動弁１２にそれぞれ接続してある。ピストン作動弁１２には油圧ポンプ１５で油槽１６から油を供給する供給回路１７と油を油槽１６に返送する返送回路１８が接続してある。油圧モーター５の駆動油の排出回路１９と圧送ピストンシリンダー９のロッド側油室９ｂの吸入回路２０が連結してあり、油圧モーター５の駆動油を圧送ピストンシリンダー９のロッド側油室９ｂに供給するようにしてある。
【０００９】
図２に示すように、排出回路１９と吸入回路２０の連結点Ｃに給排回路２１が分岐させて連結してあり、その他端がピストン作動弁１２の駆動回路１３に連結してある。この給排回路２１に流量調整弁２２と圧力調整弁２３が直列に配列してあり、ピストン作動弁１２から油槽１６の油を油圧モーター５に供給する時に、給排回路２１から吸入回路２０に供給量と供給圧を調整しながら油を圧送させるようにしてある。圧送ピストンシリンダー９のロッド側油室９ｂに供給する油圧モーター５の駆動油では油圧が不足する油を、給排回路２１から吸入回路２０に補充するものである。また、給排回路２１に逆止弁２４を介装した並列回路２５が並設してあり、圧送ピストンシリンダー９のヘッド側油室９ａに油を圧入した時に、ロッド側油室９ｂから排出される油を給排回路２１の並列回路２５から油槽１６に返送するようにしてある。
【００１０】
図２に示すように、吸入弁シリンダー８に吸入作動弁２６が配設してあり、この吸入作動弁２６には、ピストン作動弁１２に接続した供給回路１７と返送回路１８が分岐させて連結してある。吸入管２の後端部に設けた供給口３の開閉は、吸入作動弁２６の弁開側ソレノイドバルブ２６ａを作動して吸入弁シリンダー８の開放回路２７側のＢ点を供給回路１７側のＰ点に連結し、同時に閉塞回路２８側のＡ点を返送回路１８側のＴ点に連結し、供給回路１７に配設した油圧ポンプ１５で油槽１６の油を吸入弁シリンダー８のロッド側油室８ｂに供給し、図１に示す吸入管２の供給口３に対設した吸入弁７を後退させて供給口３を開放し、輸送管４にケーキが流入できるようにしてある。
【００１１】
また、吸入作動弁２６の弁閉側ソレノイドバルブ２６ｂを作動して吸入弁シリンダー８の閉塞回路２８側のＡ点を供給回路１７側のＰ点に連結し、同時に開放回路２７側のＢ点を返送回路１８側のＴ点に連結し、吸入弁シリンダー８のヘッド側油室８ｃに油を供給して吸入管２の供給口３を閉塞して、輸送管４に吸入してあるケーキを、圧送ピストン１０を前進させて輸送できるようにしてある。なお、符号２９は供給回路２５に設けた圧力計、符号３０は返送回路２６に設けた圧抜き弁、符号３１、３２は供給回路１７と返送回路１８にそれぞれ設けたフイルターと吸込弁である。
【００１２】
図３に示す太線で記載の油圧回路は、圧送ポンプのケーキ充填フローであって、先ず、図２に示す吸入作動弁２６の弁開側ソレノイドバルブ２６ａを作動して開放回路２７から吸入弁シリンダー８のロッド側油室８ｂに油を圧入し、吸入管２の供給口３に対設した吸入弁７を後退させて供給口３を開放する。同時に、図３に示すように、ピストン作動弁１２の充填側ソレノイドバルブ１２ａを作動して、油圧モーター５の駆動回路１３側のＢ点と、油槽１６の供給回路１７側のＰ点を接続し、油圧ポンプ１５で油圧モーター５に油を圧入してオーガー６を回転させる。ホッパー１の下端の開口１ａから吸入管２に落下したケーキをオーガー６が吸入管２の後端部に設けた供給口３の方向に移送させる。油圧モーター５から排出回路１９に排出された駆動油は、吸入回路２０から圧送ピストンシリンダー９のロッド側油室９ｂに供給される。
【００１３】
油圧モーター５に圧入される油は、駆動回路１３から分岐させた給排回路２２にも供給され、給排回路１９から供給量と供給圧を調整した油を吸入回路２０に圧送される。油圧モーター５の駆動油では圧送ピストンシリンダー９のロッド側油室９ｂに供給される油圧が不足する油を補給する。そして、圧送ピストンシリンダー９のロッド側油室９ｂに油が圧入されて、圧送ピストンシリンダー９に連結した圧送ピストン１０が後退することにより、ケーキが輸送管４に吸引される。また、ピストン作動弁１２の充填側ソレノイドバルブ１２ａの操作により、圧送ピストンシリンダー９の圧送回路１４側のＡ点が、油槽１６の返送回路１８側のＴ点に接続され、圧送ピストンシリンダー９のヘッド側油室９ａから油が抜き出され、油槽１６に返送される。
【００１４】
図４に示す太線で記載の油圧回路は、圧送ポンプのケーキ押出フローであって、ピストン作動弁１２の押出側ソレノイドバルブ１２ｂを作動して、圧送ピストンシリンダー９の圧送回路１４側のＡ点と、油槽１６の供給回路１７側のＰ点を接続し、圧送ピストンシリンダー９のヘッド側油室９ａに油圧ポンプ１５から油を圧入して、この輸送管４に吸入したケーキを、圧送ピストン１０を前進させて輸送するようにしてある。同時に、油圧モーター５の駆動回路１３側のＢ点と、油槽１６の返送回路１８側のＴ点が接続され、圧送ピストンシリンダー９のロッド側油室９ａから吸入回路２０に押し出された油を、給排回路２１から分岐させた並列回路２５を経由して、油槽１６に返送させるようにしてある。
【００１５】
【発明の効果】
以上のように、この発明のケーキ圧送ポンプは、輸送管へのケーキ送出し用の油圧モーターの駆動油を圧送ピストンシリンダーのロッド側油室に供給して、輸送管のケーキ充填用の動力として利用できるものである。即ち、従来のダブルシリンダー型の圧送ポンプは、バルブの開閉が頻繁となり耐久性に問題があった。また、従来のシングル型の圧送ポンプでは、圧送ポンプの作動が断続的となり、油圧の動力が増加して油圧タンクも大きくなる欠点があったものであるが、この発明にあっては、ホッパーの下方に設けた吸入管をケーキの輸送管に連結し、吸入管の供給口に配設した吸入弁と輸送管に内設した吸入・輸送用の圧送ピストンシリンダーを連動させてケーキを輸送する圧送ポンプにおいて、上記吸入管に内設したオーガーに油圧モーターを配設し、この油圧モーターの駆動油の排出回路を圧送ピストンシリンダーのロッド側油室の吸入回路に連結して、油圧モーターの駆動油を圧送ピストンシリンダーのロッド側油室に供給するもので、シングル型のケーキ圧送ポンプの油圧を有効利用してホッパーからのケーキの供給と、輸送管へのケーキの吸込みを連動させるケーキ圧送ポンプとなるものである。そして、油圧モーターの駆動油の排出回路と、圧送ピストンシリンダーのロッド側油室への吸入回路の連結点に給排回路を連結し、この給排回路に流量調整弁と圧力調整弁を直列に配列してピストン作動弁に接続して、圧送ピストンシリンダーのロッド側油室の不足する油圧を油槽から吸入回路に補給するもので、使用する油量が減少され、油圧タンクも小さくなるものである。
【図面の簡単な説明】
【図１】この発明に係るケーキ圧送ポンプの縦断側面図である。
【図２】ケーキ圧送ポンプに用いる油圧回路のフローチャートである。
【図３】油圧回路の要部フローチャートであって、圧送ポンプのケーキ充填フローである。
【図４】油圧回路の要部フローチャートであって、圧送ポンプのケーキ押出フローである。
【符号の説明】
１ホッパー
２吸入管
３供給口
４輸送管
５油圧モーター
６オーガー
７吸入弁
９圧送ピストンシリンダー
９ａヘッド側油室
９ｂロッド側油室
１２ピストン作動弁
１３駆動回路
１４圧送回路
１６油槽
１９排出回路
２０吸入回路
２１給排回路
２２流量調整弁
２３圧力調整弁
２４逆止弁
２５並列回路
Ｃ連結点[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cake pressure feed pump for sludge and the like, and more particularly, to an apparatus for operating a pressure feed piston cylinder using drive oil press-fitted into a hydraulic motor of an auger for cake supply.
[0002]
[Prior art]
Conventionally, as a piston-type pressure pump, for example, a double cylinder type is generally used as described in JP-A-62-147054. The drive of this double cylinder type hydraulic cylinder uses a hydraulic pump, but since oil is sent alternately to a pair of cylinders, it leads to reduction of hydraulic power and hydraulic tank. For example, as described in Japanese Patent Application Laid-Open No. 7-332230, a suction valve is provided at a supply port provided with an auger below the hopper, and suction / compression is performed on a transport pipe that opens and closes the supply port. Also known is a single-type pressure-feed piston pump having a pressure-feed piston cylinder for use therein.
[0003]
[Problems to be solved by the invention]
The conventional double-cylinder type pressure pump has a problem in durability because the oil is alternately fed to the cylinder, so that the valve is frequently opened and closed at the supply port. In addition, the single type has a drawback in that the hydraulic power is increased and the hydraulic tank is increased due to the intermittent operation of the pressure pump. The cake pressure pump needs an auger, a paddle and the like for feeding the cake to the pump. In the case of a single type, these are also intermittently operated. These drives are performed when the cylinder of the pressure pump after the cake is discharged is retracted and the cake is sucked into the transport pipe. The present invention provides an apparatus for reducing the amount of oil to be used by effectively utilizing the hydraulic pressure of a single cake pump.
[0004]
[Means for Solving the Problems]
The gist of the present invention is that a suction pipe provided below a hopper is connected to a cake transport pipe, and a suction valve disposed at a supply port of the suction pipe and a suction piston cylinder for suction and transport provided in the transport pipe are provided. In a pressure-feed pump that transports cake in conjunction, a hydraulic motor is installed in the auger built in the suction pipe, and the drive oil discharge circuit of this hydraulic motor is connected to the suction circuit of the rod-side oil chamber of the pressure-feed piston cylinder. The hydraulic oil drive oil is supplied to the rod-side oil chamber of the pressure-feed piston cylinder, and the hydraulic motor drive circuit and the pressure-feed circuit of the head-side oil chamber of the pressure-feed piston cylinder are connected to the oil tank. Connected, pressurizes oil from the oil tank into the hydraulic motor, and discharges the oil in the head side oil chamber of the pumping piston cylinder to the oil tank. Using the over drive oil, but to operate the pumping piston cylinder.
[0005]
A supply / discharge circuit is connected to the connection point of the hydraulic motor drive oil discharge circuit and the suction circuit to the rod-side oil chamber of the pressure-feed piston cylinder. A flow rate adjustment valve and a pressure adjustment valve are arranged in series in this supply / discharge circuit. The hydraulic pressure that is insufficient in the oil chamber on the rod side of the pressure feed piston cylinder is replenished from the supply / discharge circuit to the suction circuit, and a check valve is interposed in the supply / discharge circuit connected to the piston operation valve. The parallel circuit is branched and the oil discharged from the rod side oil chamber of the pressure-feed piston cylinder is returned from the parallel circuit to the oil tank.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The cake pressure feeding pump according to the present invention is configured as described above, and operates the piston operating valve to press-fit oil from the supply circuit to the hydraulic motor, and rotates the auger to store the cake stored in the hopper from the lower opening. The cake is dropped into the suction pipe and the cake is transferred to the supply port with an auger. At the same time that the intake valve is opened by the intake valve cylinder provided at the supply port of the intake pipe, the hydraulic motor drive oil is supplied to the rod-side oil chamber of the pressure-feed piston cylinder, and the rod-side oil chamber of the pressure-feed piston cylinder is insufficient. From the oil tank to the suction circuit. A suction / transport piston cylinder disposed at the end of the transport pipe retracts the feed piston by the oil pressure in the rod-side oil chamber, and sucks the cake from the opened suction pipe supply port into the transport pipe. Next, the supply port of the suction pipe is closed by the suction valve, the oil is press-fitted into the head-side oil chamber of the pressure-feed piston cylinder, and the cake sucked into the transport pipe is pressure-fed by advancing the pressure-feed piston. This operation is repeated continuously to transport the cake.
[0007]
【Example】
The cake pressure feed pump according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows a pressure feed pump in which a suction pipe 2 is connected to an opening 1a provided in a lower portion of a hopper 1, and a rear end of the suction pipe 2 The supply port 3 is connected to the peripheral wall of the cake transport pipe 4. An auger 6 provided with a hydraulic motor 5 is provided in the suction pipe 2 and is opposed to an opening 1 a provided in the lower part of the hopper 1. Then, the cake supplied to the hopper 1 is dropped from the opening 1a at the lower end of the hopper 1 to the suction pipe 2, and the auger 6 is rotated to transfer the cake in the direction of the supply port 3 provided at the rear end portion of the suction pipe 2. It is like that. A suction valve 7 is provided in the supply port 3 of the suction pipe 2, and a piston rod 8 a of the suction valve cylinder 8 is connected to the suction valve 7 through the transport pipe 4. Then, the piston rod 8a of the intake valve cylinder 8 is expanded and contracted to move the intake valve 7, and the supply port 3 is opened and closed. A suction piston cylinder 9 for suction and transportation is disposed at the end of the transport pipe 4 to which the suction pipe 2 is connected. The suction piston 7 connected to the pressure piston cylinder 9 is moved backward to open the suction valve 7. The cake is sucked into the end of the transport pipe 4 from the supply port 3 of the suction pipe 2. The cake sucked into the transport pipe 4 is transported by advancing the pumping piston 10. In addition, the code | symbol 11 is a non-return valve which prevents the reverse flow of the cake pumped from the edge part of the transport pipe 4. FIG.
[0008]
As shown in FIG. 2, a piston operating valve 12 is disposed in the hydraulic motor 5 that operates the auger 6 and the pressure-feeding piston cylinder 9, and a drive circuit 13 for oil to the hydraulic motor 5 and the head side of the pressure-feeding piston cylinder 9. A pumping circuit 14 connected to the oil chamber 9a is connected to the piston operating valve 12 respectively. A supply circuit 17 for supplying oil from an oil tank 16 by a hydraulic pump 15 and a return circuit 18 for returning oil to the oil tank 16 are connected to the piston operating valve 12. A drive oil discharge circuit 19 of the hydraulic motor 5 and a suction circuit 20 of the rod side oil chamber 9b of the pressure feed piston cylinder 9 are connected, and the drive oil of the hydraulic motor 5 is supplied to the rod side oil chamber 9b of the pressure feed piston cylinder 9. I have to do it.
[0009]
As shown in FIG. 2, a supply / discharge circuit 21 is branched and connected to a connection point C between the discharge circuit 19 and the suction circuit 20, and the other end is connected to the drive circuit 13 of the piston operating valve 12. A flow rate adjusting valve 22 and a pressure adjusting valve 23 are arranged in series in the supply / discharge circuit 21, and when supplying oil from the oil tank 16 to the hydraulic motor 5 from the piston operating valve 12, the supply / discharge circuit 21 changes to the intake circuit 20. The oil is pumped while adjusting the supply amount and supply pressure. Oil that is insufficient in hydraulic pressure in the drive oil of the hydraulic motor 5 supplied to the rod-side oil chamber 9 b of the pressure-feed piston cylinder 9 is replenished from the supply / discharge circuit 21 to the suction circuit 20. Further, a parallel circuit 25 having a check valve 24 interposed in the supply / discharge circuit 21 is provided in parallel, and is discharged from the rod-side oil chamber 9b when oil is injected into the head-side oil chamber 9a of the pressure-feed piston cylinder 9. Oil is returned from the parallel circuit 25 of the supply / discharge circuit 21 to the oil tank 16.
[0010]
As shown in FIG. 2, a suction operation valve 26 is disposed in the suction valve cylinder 8, and a supply circuit 17 and a return circuit 18 connected to the piston operation valve 12 are branched and connected to the suction operation valve 26. It is. The supply port 3 provided at the rear end of the suction pipe 2 is opened and closed by operating the valve opening side solenoid valve 26a of the suction operation valve 26 so that the point B on the opening circuit 27 side of the suction valve cylinder 8 is connected to the supply circuit 17 side. At the same time, the point A on the closing circuit 28 side is connected to the point T on the return circuit 18 side, and the oil in the oil tank 16 is supplied to the rod side oil of the intake valve cylinder 8 by the hydraulic pump 15 disposed in the supply circuit 17. Supplying to the chamber 8b, the suction valve 7 provided in the suction port 2 of the suction pipe 2 shown in FIG. 1 is retracted to open the supply port 3, so that the cake can flow into the transport pipe 4.
[0011]
Further, the valve closing side solenoid valve 26b of the suction operation valve 26 is operated to connect the point A on the closing circuit 28 side of the suction valve cylinder 8 to the point P on the supply circuit 17 side, and at the same time, point B on the opening circuit 27 side. The cake which is connected to the T point on the return circuit 18 side, supplies oil to the head side oil chamber 8c of the suction valve cylinder 8 and closes the supply port 3 of the suction pipe 2, and sucks the cake sucked into the transport pipe 4, The pumping piston 10 is moved forward so that it can be transported. Reference numeral 29 is a pressure gauge provided in the supply circuit 25, reference numeral 30 is a pressure release valve provided in the return circuit 26, and reference numerals 31 and 32 are filters and suction valves provided in the supply circuit 17 and the return circuit 18, respectively.
[0012]
3 is a cake filling flow of the pressure feed pump. First, the valve opening side solenoid valve 26a of the suction operation valve 26 shown in FIG. The oil is press-fitted into the rod-side oil chamber 8 b of 8, the suction valve 7 provided opposite to the supply port 3 of the suction pipe 2 is moved backward to open the supply port 3. At the same time, as shown in FIG. 3, the charging side solenoid valve 12a of the piston operating valve 12 is operated to connect the point B on the drive circuit 13 side of the hydraulic motor 5 and the point P on the supply circuit 17 side of the oil tank 16. Then, oil is pressed into the hydraulic motor 5 by the hydraulic pump 15 and the auger 6 is rotated. The auger 6 causes the auger 6 to transfer the cake dropped from the opening 1 a at the lower end of the hopper 1 to the suction pipe 2 in the direction of the supply port 3 provided at the rear end of the suction pipe 2. The drive oil discharged from the hydraulic motor 5 to the discharge circuit 19 is supplied from the suction circuit 20 to the rod-side oil chamber 9 b of the pressure-feed piston cylinder 9.
[0013]
The oil press-fitted into the hydraulic motor 5 is also supplied to the supply / discharge circuit 22 branched from the drive circuit 13, and the oil whose supply amount and supply pressure are adjusted is pumped from the supply / discharge circuit 19 to the suction circuit 20. The drive oil of the hydraulic motor 5 replenishes the oil whose hydraulic pressure supplied to the rod side oil chamber 9b of the pressure feed piston cylinder 9 is insufficient. Then, oil is pressed into the rod-side oil chamber 9 b of the pressure-feed piston cylinder 9, and the pressure-feed piston 10 connected to the pressure-feed piston cylinder 9 moves backward, whereby the cake is sucked into the transport pipe 4. Further, by operating the charging side solenoid valve 12a of the piston operating valve 12, the point A on the pressure feeding circuit 14 side of the pressure feeding piston cylinder 9 is connected to the point T on the return circuit 18 side of the oil tank 16, and the head of the pressure feeding piston cylinder 9 is connected. Oil is extracted from the side oil chamber 9 a and returned to the oil tank 16.
[0014]
The hydraulic circuit described in bold lines in FIG. 4 is a cake push-out flow of the pressure feed pump, which operates the push-out side solenoid valve 12b of the piston actuating valve 12 and points A on the pressure feed circuit 14 side of the pressure feed piston cylinder 9. The point P on the supply circuit 17 side of the oil tank 16 is connected, oil is injected from the hydraulic pump 15 into the head-side oil chamber 9a of the pressure-feed piston cylinder 9, and the cake sucked into the transport pipe 4 is transferred to the pressure-feed piston 10 It is supposed to be transported forward. At the same time, point B on the drive circuit 13 side of the hydraulic motor 5 and point T on the return circuit 18 side of the oil tank 16 are connected, and the oil pushed out from the rod side oil chamber 9a of the pressure feed piston cylinder 9 to the suction circuit 20 is It is made to return to the oil tank 16 via the parallel circuit 25 branched from the supply / discharge circuit 21.
[0015]
【The invention's effect】
As described above, the cake pressure feeding pump of the present invention supplies the driving oil of the hydraulic motor for sending cake to the transport pipe to the rod side oil chamber of the pressure feeding piston cylinder, and serves as power for filling the cake of the transport pipe. It can be used. That is, the conventional double cylinder type pressure pump has a problem in durability because the valve is frequently opened and closed. In addition, in the conventional single type pump, the operation of the pump is intermittent, and the hydraulic power is increased and the hydraulic tank is enlarged. The suction pipe provided below is connected to the cake transport pipe, and the suction valve provided at the inlet of the suction pipe is linked to the suction / transport piston cylinder installed in the transport pipe to transport the cake. In the pump, a hydraulic motor is disposed in an auger provided in the suction pipe, and a drive oil discharge circuit of the hydraulic motor is connected to a suction circuit of a rod-side oil chamber of the pressure-feed piston cylinder so as to drive the hydraulic motor. Is supplied to the rod-side oil chamber of the pressure-feed piston cylinder. The cake pressure is supplied from the hopper and the cake is sucked into the transport pipe by effectively using the hydraulic pressure of the single-type cake pressure-feed pump. And it serves as a cake pressure pump to link themselves. A supply / discharge circuit is connected to the connection point of the hydraulic motor drive oil discharge circuit and the suction circuit to the rod-side oil chamber of the pressure-feed piston cylinder. A flow rate adjustment valve and a pressure adjustment valve are connected in series to this supply / discharge circuit. It is arranged and connected to the piston operating valve to replenish the hydraulic pressure that is insufficient in the rod side oil chamber of the pumping piston cylinder from the oil tank to the suction circuit, reducing the amount of oil used and reducing the hydraulic tank. .
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a cake pump according to the present invention.
FIG. 2 is a flowchart of a hydraulic circuit used for a cake pressure feed pump.
FIG. 3 is a main part flowchart of a hydraulic circuit, which is a cake filling flow of a pressure pump.
FIG. 4 is a main part flowchart of a hydraulic circuit, and is a cake extrusion flow of a pressure feed pump.
[Explanation of symbols]
1 Hopper 2 Suction Pipe 3 Supply Port 4 Transport Pipe 5 Hydraulic Motor 6 Auger 7 Suction Valve 9 Pressure Piston Cylinder 9a Head Side Oil Chamber 9b Rod Side Oil Chamber 12 Piston Actuation Valve 13 Drive Circuit 14 Pressure Feed Circuit 16 Oil Tank 19 Discharge Circuit 20 Suction Circuit 21 Supply / exhaust circuit 22 Flow rate adjustment valve 23 Pressure adjustment valve 24 Check valve 25 Parallel circuit C Connection point

Claims

The suction pipe (2) provided below the hopper (1) is connected to the cake transport pipe (4), and the suction valve (7) and the transport pipe (located at the supply port (3) of the suction pipe (2) ( 4) In the pressure feed pump that transports the cake by interlocking the suction / transport piston cylinder (9) installed in 4), the auger (6) installed in the suction pipe (2) is provided with a hydraulic motor (5). The drive oil discharge circuit of the hydraulic motor (5) is connected to the suction circuit of the rod-side oil chamber (9b) of the pressure-feed piston cylinder (9) to drive the drive oil of the hydraulic motor (5) to the pressure-feed piston. While supplying the rod side oil chamber (9b) of the cylinder (9), the drive circuit (13) of the hydraulic motor (5) and the pressure feed circuit (14) of the head side oil chamber (9a) of the pressure feed piston cylinder (9) are provided. Piston actuating valve (12 connected to the oil tank (16)) The oil tank (16) is pressed into the hydraulic motor (5), and the oil in the head-side oil chamber (9a) of the pressure-feed piston cylinder (9) is discharged to the oil tank (16). Cake pump.

A supply / discharge circuit (21) is connected to a connection point (C) of the drive oil discharge circuit (19) of the hydraulic motor (5) and the suction circuit (20) to the rod side oil chamber (9b) of the pressure feed piston cylinder (9). The flow rate adjusting valve (22) and the pressure adjusting valve (23) are arranged in series in this supply / discharge circuit (21) and communicated with the piston operating valve (12), and the rod of the pressure feeding piston cylinder (9) is connected. The shortage of hydraulic pressure in the side oil chamber (9b) is replenished from the supply / discharge circuit (21) to the suction circuit (20), and the check valve (24) is connected to the supply / discharge circuit (21) connected to the piston operating valve (12). Branching the parallel circuit (25) intervening and returning the oil discharged from the rod side oil chamber (9b) of the pressure feed piston cylinder (9 ) from the parallel circuit (25) to the oil tank (16). The cake pump according to claim 1, wherein