JP2908682B2 - Weight control hydraulic circuit of casing excavator - Google Patents
Weight control hydraulic circuit of casing excavatorInfo
- Publication number
- JP2908682B2 JP2908682B2 JP5323659A JP32365993A JP2908682B2 JP 2908682 B2 JP2908682 B2 JP 2908682B2 JP 5323659 A JP5323659 A JP 5323659A JP 32365993 A JP32365993 A JP 32365993A JP 2908682 B2 JP2908682 B2 JP 2908682B2
- Authority
- JP
- Japan
- Prior art keywords
- oil
- solenoid valve
- valve
- cylinder
- oil passage
- 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 - Fee Related
Links
Landscapes
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Earth Drilling (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はケーシング掘削機の自重
制御油圧回路に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic circuit for controlling the weight of a casing excavator.
【０００２】[0002]
【従来の技術】図１は、ケーシング掘削機の要部側面図
を示す。ケーシングＡの下端にビットＢ′を備えたケー
シングヘッドＢが設けられている。ケーシングＡは昇降
シリンダＣにより昇降ガイドＤに案内されて昇降する。
又回転用油圧モータＥを備えた回転装置Ｆにより回転し
て下端のビットＢ′により掘削する。Ｇはベースフレー
ムで複数個のアウトリガーＨを岩盤上に据えて掘削作業
が行われる。Ｉはチャック装置でこれによりケーシング
Ａが固定（チャック）される。2. Description of the Related Art FIG. 1 is a side view of a main part of a casing excavator. At the lower end of the casing A, a casing head B having a bit B 'is provided. The casing A is guided up and down by a lifting guide D by a lifting cylinder C.
In addition, it is rotated by the rotating device F provided with the hydraulic motor E for rotation, and excavated by the bit B 'at the lower end. G is a base frame on which a plurality of outriggers H are mounted on a bedrock for excavation work. I is a chuck device by which the casing A is fixed (chuck).
【０００３】図２はこのようなケーシング掘削機の昇降
シリンダ１５（図１に示した昇降シリンダＣに相当す
る）の駆動回路図である。通常の作業時のシリンダ伸び
操作は図２（ｂ）の電磁弁の励磁表に示す如く、ＳＯＬ
１とＳＯＬ４を励磁する。すると油圧ポンプ１からの圧
油は、油路ａから４ポート３位置ソレノイド弁５、油路
ｂ、カウンタバランス弁１４、伸側の油路ｃを経て昇降
シリンダ１５のシリンダヘッド側に送られる。ロッド側
の油は縮側の油路ｄを経て前記ソレノイド弁５を経てタ
ンクＴへ戻る。FIG. 2 is a drive circuit diagram of a lift cylinder 15 (corresponding to the lift cylinder C shown in FIG. 1) of such a casing excavator. As shown in the excitation table of the solenoid valve in FIG.
1 and SOL4 are excited. Then, the pressure oil from the hydraulic pump 1 is sent from the oil passage a to the cylinder head side of the elevating cylinder 15 via the 4-port 3-position solenoid valve 5, the oil passage b, the counter balance valve 14, and the oil passage c on the extension side. The oil on the rod side returns to the tank T via the solenoid valve 5 via the oil path d on the contraction side.
【０００４】又シリンダ縮み操作は同じく電磁弁の励磁
表に示す如く、ＳＯＬ２とＳＯＬ３を励磁する。すると
油圧ポンプ１からの圧油は油路ａ、前記ソレノイド弁
５、縮み側の油路ｄ、そして昇降シリンダ１５のロッド
側に送られる。シリンダヘッド側の油は伸側の油路ｃ、
カウンタバランス弁１４、ソレノイド弁５、タンクＴへ
戻る。The cylinder contraction operation also excites SOL2 and SOL3 as shown in the excitation table of the solenoid valve. Then, the pressure oil from the hydraulic pump 1 is sent to the oil passage a, the solenoid valve 5, the oil passage d on the contraction side, and the rod side of the elevating cylinder 15. The oil on the cylinder head side is the oil path c on the extension side,
The process returns to the counter balance valve 14, the solenoid valve 5, and the tank T.
【０００５】さらに差動回路時は４ポート２位置のソレ
ノイド弁１０をＳＯＬ５とＳＯＬ１を励磁して切替え
る。するとソレノイド弁５は励磁されていないので、油
路ａの圧油でソレノイド弁１０を経てパイロット圧が伸
側の油路と縮側の油路ｄとの間に配されたパイロットチ
ェック弁１２に作用しその逆流を可能にし、縮側の油路
ｄと伸側油路ｃとを連通させる。Further, at the time of the differential circuit, the solenoid valve 10 at the 4-port 2-position is switched by exciting SOL5 and SOL1. Then, since the solenoid valve 5 is not excited, the pilot pressure is applied to the pilot check valve 12 disposed between the expansion side oil path and the contraction side oil path d via the solenoid valve 10 with the pressure oil in the oil path a. It acts to enable the reverse flow, and connects the contraction side oil passage d and the expansion side oil passage c.
【０００６】このように従来のケーシング掘削機におい
ては昇降シリンダ１５の縮力（即ちケーシングの圧入
力）を制御していた。しかし掘削深さが深くなると、ケ
ーシングが継ぎ足され、ケーシングヘッドＢに作用する
押付力は自重だけでも大きな値となり、ビットＢ′の摩
耗や切損が発生し、掘削効率の低下をもたらした。As described above, in the conventional casing excavator, the compressive force of the elevating cylinder 15 (that is, the pressure input to the casing) is controlled. However, when the excavation depth became deeper, the casing was extended, and the pressing force acting on the casing head B became a large value only by its own weight, causing wear and cutting of the bit B ′, resulting in a decrease in excavation efficiency.
【０００７】[0007]
【発明が解決しようとする課題】ケーシングヘッドＢに
作用する押付力を制御することにより、ビットＢ′の摩
耗，切損等を少なくし、効率よくケーシング掘削ができ
るようにすることを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to control the pressing force acting on the casing head B to reduce wear, cut-off and the like of the bit B 'and to enable efficient casing excavation. .
【０００８】[0008]
【課題を解決するための手段】昇降シリンダ１５の伸び
操作時には油圧ポンプ１からの圧油が、切替用の４ポー
ト３位置ソレノイド弁５を経てカウンタバランス弁１４
から昇降シリンダ１５の伸側の油路ｃを経て昇降シリン
ダ１５のシリンダヘッド側に送られ、又ロッド側の油が
縮側の油路ｄを経て前記切替用の４ポート３位置ソレノ
イド弁５からタンクＴへ戻り、又昇降シリンダ１５の縮
み操作時は４ポート３位置ソレイイド弁５を切替えるこ
とにより、油圧ポンプ１からの圧油は前記切替用のソレ
ノイド弁５、昇降シリンダ１５の縮み側の油路ｄを経て
昇降シリンダ１５のロッド側に送られ、シリンダヘッド
側の油は伸側の油路ｃ、カウンタバランス弁１４、ソレ
ノイド弁５からタンクＴへ戻り、さらに差動回路時はソ
レノイド弁１０を励磁し、油圧ポンプ１からの圧油でソ
レノイド弁１０を介して油圧ポンプ１からの圧油をパイ
ロット圧として作用させることによってパイロットチェ
ック弁１２を逆流させ、該パイロットチェック弁１２の
両側に配設したチェック弁９と１３を介して縮側の油路
ｄと伸側の油路ｃとを連通させるよう構成したケーシン
ング掘削機油圧回路において、前記昇降シリンダ１５の
伸側の油路ｃから分岐した分岐油路ｅにスロットル弁８
を介し切替用の４ポート３位置ソレノイド弁７を接続
し、該ソレノイド弁７の中立位置では、前記分岐油路ｅ
は閉じられて、前記油圧ポンプ１からの圧油を切替える
ソレノイド弁５によって制御可能な回路となり、分岐油
路ｅの前記ソレノイド弁７を一方に励磁すると、昇降シ
リンダ１５の伸側から出る油Ｑ１が伸側の油路ｃを通
り、分岐油路ｅに設けた前記スロットル弁８からソレノ
イド弁７を通ってシリンダ縮側の油路ｄ側に流れる油Ｑ
２と、パイロットチェック弁１２の前に配したチェック
弁９からリリーフ弁４を通って流れる油Ｑ３とに分岐す
る自重掘削回路と、前記切替用のソレノイド弁７を他方
に励磁すると、昇降シリンダ１５の伸側からの油Ｑ１は
伸側の油路ｃを通り、スロットル弁８から前記ソレノイ
ド弁７を経てリリーフ弁１１を通ったのち、さらに２つ
の流れに分岐し、分岐した一方の油Ｑ２は前記ソレノイ
ド弁７を経て縮側の油路ｄを介し昇降シリンダ１５の縮
側に、又分岐した他方の油Ｑ３はチェック弁６を通りタ
ンクＴへと流れ自重制御掘削回路を構成するようにし
た。When the elevating cylinder 15 is extended, the hydraulic oil from the hydraulic pump 1 passes through the switching 4-port 3-position solenoid valve 5 and the counterbalance valve 14.
Through the oil path c on the extension side of the lift cylinder 15 to the cylinder head side of the lift cylinder 15, and the oil on the rod side passes through the oil path d on the contraction side from the 4-port 3-position solenoid valve 5 for switching. Returning to the tank T and switching the 4-port 3-position solenoid valve 5 when the lifting cylinder 15 is contracted, the pressure oil from the hydraulic pump 1 is supplied to the switching solenoid valve 5 and the oil on the contracting side of the lifting cylinder 15. The oil on the cylinder head side is returned to the tank T from the oil path c on the extension side, the counterbalance valve 14, and the solenoid valve 5 via the path d, and the solenoid valve 10 is used for the differential circuit. And the pressure oil from the hydraulic pump 1 acts as the pilot pressure via the solenoid valve 10 with the pressure oil from the hydraulic pump 1 to cause the pilot check valve 12 to flow backward. In the casing excavator hydraulic circuit configured to communicate the contraction-side oil path d and the expansion-side oil path c via check valves 9 and 13 disposed on both sides of the pilot check valve 12, The throttle valve 8 is connected to a branch oil passage e branched from the oil passage c on the extension side of the cylinder 15.
Is connected to a switching 4-port 3-position solenoid valve 7 through the branch oil passage e at the neutral position of the solenoid valve 7.
Is closed to form a circuit controllable by the solenoid valve 5 for switching the pressure oil from the hydraulic pump 1. When the solenoid valve 7 of the branch oil passage e is excited to one side, the oil Q coming out of the extension side of the lifting cylinder 15 The oil Q flows from the throttle valve 8 provided in the branch oil passage e through the solenoid valve 7 to the cylinder compression oil passage d through the oil passage c on the extension side.
2 , a self-weight excavation circuit that branches from a check valve 9 disposed in front of the pilot check valve 12 to an oil Q 3 flowing through the relief valve 4, and the solenoid valve 7 for switching is energized to the other. The oil Q1 from the expansion side of No. 15 passes through the oil path c on the expansion side, passes through the relief valve 11 from the throttle valve 8 via the solenoid valve 7, and is further branched into two flows. Q 2 flows through the solenoid valve 7 via the oil path d on the compression side to the compression side of the lifting / lowering cylinder 15, and the other branched oil Q 3 flows through the check valve 6 to the tank T to form a gravity control drilling circuit. I did it.
【０００９】[0009]
【実施例】図３に基いて説明する。図２と図３を比較
し、異っているのは、昇降シリンダ１５の伸側の油路ｃ
から分岐する分岐油路ｅを設けた点である。伸側の油路
ｃから分岐した油路にはスロットル弁８、４ポート３位
置ソレノイド弁７を接続している。ソレノイド弁７のポ
ートＡはリリーフ弁１１を介し、ソレノイド弁７のポー
トＴ及びチェック弁６を介し、切替操作用の４ポート３
位置ソレノイド弁５のタンク側ポートに接続されてい
る。又ソレノイド弁７のポートＢは昇降シリンダ１５の
縮側油路ｄと接続されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. The difference between FIG. 2 and FIG. 3 is that the oil path c on the extension side of the lift cylinder 15 is different.
This is a point that a branch oil passage e branching from is provided. A throttle valve 8, a 4-port 3-position solenoid valve 7 is connected to an oil passage branched from the oil passage c on the extension side. The port A of the solenoid valve 7 is connected via the relief valve 11, the port T of the solenoid valve 7 and the check valve 6, and the four ports 3 for switching operation are provided.
It is connected to the tank side port of the position solenoid valve 5. Further, the port B of the solenoid valve 7 is connected to the compression-side oil passage d of the elevating cylinder 15.
【００１０】図３の如く、チェック弁６とソレノイド弁
７とスロットル弁８及びリリーフ弁１１を配した油路ｅ
を分岐形成したことにより、昇降シリンダ１５の縮圧力
を制御するのでなく、自重をそのままケーシングヘッド
Ｂに作用させる回路（フリー回路）と、昇降シリンダ１
５に背圧を作用させることによる自重−α（自重制御）
の荷重をケーシングヘッドＢに作用させる回路との二つ
の回路構成により、地盤の変化又は自重の変化に対応し
うる様にした点を特徴としている。この回路構成によ
り、通常圧入掘削、自重掘削、自重制御掘削のあらゆる
掘削方法が可能となる。又スロットル弁８を設けた事に
より、掘削スピードの制御も可能となる。As shown in FIG. 3, an oil passage e in which a check valve 6, a solenoid valve 7, a throttle valve 8 and a relief valve 11 are arranged.
And a circuit (free circuit) for applying the own weight to the casing head B without controlling the compression pressure of the lift cylinder 15 and the lift cylinder 1
5 by applying back pressure to its own weight-α (weight control)
The circuit is characterized in that it can cope with a change in ground or a change in its own weight by two circuit configurations including a circuit for applying the load to the casing head B. With this circuit configuration, all kinds of excavation methods such as normal press-in excavation, self-weight excavation, and self-weight control excavation become possible. In addition, the provision of the throttle valve 8 makes it possible to control the excavation speed.
【００１１】以下油圧回路についてさらに詳細に説明す
る。 （１） ４ポート３位置ソレノイド弁７が中立位置の時
［図３の状態］ ４ポート３位置ソレノイド弁７が中立位置にあるときは
油路ｅは閉じられ、油圧回路は図２と同じ通常のシリン
ダ伸・縮の回路となるため、そのシリンダの伸・縮操作
は４ポート３位置ソレノイド弁５により制御される。ケ
ーシング掘削機としては、圧入（シリンダ縮）、引抜
（シリンダ伸）の動作が可能となる。 （２）自重掘削について（４ポート３位置ソレノイド弁
７のＳＯＬ８を励磁して図４の状態にする）。 前記ソレノイド弁７のＳＯＬ８が励磁した時［図４］に
は、昇降シリンダ１５の伸側から出てくる油Ｑ１は伸側
の油路ｃを通り、ソレノイド弁７を通り抜け縮側の油路
ｄ側に流れる。昇降シリンダ１５は伸側・縮側で面積差
があるため、ソレノイド弁７から出た油Ｑ１は途中でＱ
２とＱ３に分かれ、Ｑ２はシリンダの縮側に縮側の油路
ｄを介して流れ、Ｑ３はチェック弁９を通り、さらにリ
リーフ弁４を通りタンクへ流れる。この回路においては
昇降シリンダ１５の伸側に圧力が働かないため、自重掘
削となる。なお油Ｑ３はリリーフ弁４のクラッキング圧
迄の背圧が立つので、Ｑ３と分岐するＱ２にも同じ背圧
が立ち、Ｑ２は縮側の油路ｄを通って昇降シリンダ１５
の縮側に流れる。Hereinafter, the hydraulic circuit will be described in more detail. (1) When the 4-port 3-position solenoid valve 7 is in the neutral position [state in FIG. 3] When the 4-port 3-position solenoid valve 7 is in the neutral position, the oil passage e is closed, and the hydraulic circuit is the same as in FIG. Therefore, the cylinder expansion / contraction operation is controlled by a 4-port 3-position solenoid valve 5. As the casing excavator, press-fitting (cylinder contraction) and pull-out (cylinder extension) operations are possible. (2) Excavation by its own weight (SOL 8 of the 4-port 3-position solenoid valve 7 is excited to bring it into the state shown in FIG. 4). In FIG. 4 when SOL8 of the solenoid valve 7 is excited, the oil Q 1 coming out of the extension side of the lifting cylinder 15 through the oil passage c of the extension side oil passage of the reduced side through the solenoid valve 7 It flows to d side. Since the lifting cylinder 15 have a differential area in the extension side-contraction side, Q oil Q 1 leaving the solenoid valve 7 in the middle
Divided into 2 and Q 3, Q 2 flows via the oil passage d of the reduced side to the reduced side of the cylinder, Q 3 passes through the check valve 9, further through the relief valve 4 and into the tank. In this circuit, since no pressure acts on the extension side of the lift cylinder 15, the excavation is performed by its own weight. Note the oil Q 3 are standing back pressure cracking圧迄of the relief valve 4, also standing the same back pressure in the Q 2 to which branches Q 3, Q 2 is lift cylinder 15 through the oil passage d of the reduced side
Flows to the compression side.
【００１２】（３）自重制御掘削（４ポート３位置ソレ
ノイド弁７のＳＯＬ７を励磁して図５の状態にする）。 ソレノイド弁７のＳＯＬ７が励磁した時［図５］には、
昇降シリンダ１５の伸側から出てくる油Ｑ１は伸側の油
路ｃを通り、スロットル弁８を介しソレノイド弁７を通
り、リリーフ弁１１に流れる。リリーフ弁１１を通った
油Ｑ１は上記（２）の自重掘削時と同様にＱ２とＱ３に
分かれ、Ｑ２は縮側の油路ｄを介して昇降シリンダの縮
側に流れる。又Ｑ３はチェック弁６を通りタンクへと流
れる。この回路においては、昇降シリンダ１５の伸側に
リリーフ弁１１の圧力が働くため、その圧力に相当する
荷重が自重より差引かれ、自重を制御する掘削が可能と
なる。なお、Ｑ３はチェック弁６のバネ圧により背圧が
立つので、Ｑ３と分岐するＱ２にも同じ背圧が立ち、Ｑ
２はソレノイド弁７を通り、縮側管路ｄを通って昇降シ
リンダ１５の縮側に流れる。但し、Ｑ２は場合によって
は、図４のようにチェック弁９の所へも一部流れて、油
圧ポンプ１からの油と合流した後、リリーフ弁４からタ
ンクへ落ちるコースもあり、その場合でもリリーフ弁の
背圧が立つ。(3) Self-weight control excavation (excitation of SOL 7 of the 4-port 3-position solenoid valve 7 to bring it into the state shown in FIG. 5). When SOL7 of the solenoid valve 7 is excited (FIG. 5),
Oil Q 1 coming out of the extension side of the lifting cylinder 15 through the oil passage c of the extension side, through the solenoid valve 7 via the throttle valve 8, it flows through the relief valve 11. Oil Q 1 passing through the relief valve 11 is divided into its own weight while-drilling as well as Q 2 and Q 3 of the (2), Q 2 flows to contraction side of the lifting cylinder via the oil passage d of the reduced side. The Q 3 flows to the street tank check valve 6. In this circuit, since the pressure of the relief valve 11 acts on the extension side of the elevating cylinder 15, a load corresponding to the pressure is subtracted from its own weight, and excavation for controlling its own weight becomes possible. Incidentally, Q 3 because back pressure stand by the spring pressure of the check valve 6, also standing the same back pressure in the Q 2 to which branches Q 3, Q
Numeral 2 passes through the solenoid valve 7 and flows to the compression side of the elevating cylinder 15 through the compression side pipe d. However, the case Q 2 is the flow part also to the place of the check valve 9 as shown in FIG. 4, after having been mixed with the oil from the hydraulic pump 1, there is also course fall from the relief valve 4 to the tank, when the But the back pressure of the relief valve rises.
【００１３】[0013]
【効果】ケーシングの下端に装着した昇降シリンダ１５
の伸側の油路ｃと縮側の油路ｄとの間に油路ｅを分岐さ
せ、該油路内に４ポート３位置ソレノイド弁７を介しチ
ェック弁６、リリーフ弁１１及びスロットル弁８を配
し、昇降シリンダ１５の伸側圧力を制御し、制御された
油を縮側（ロッド側）への補給用油として利用し、余っ
た油をタンクＴに戻すようにした。このようにケーシン
グヘッドに作用する押付力を制御するようにしたので、
ケーシングヘッドに設けたビットの摩耗，切損等が少な
くなり、効率よくケーシング掘削を行うことができるよ
うになった。特に、（１）４ポート３位置ソレノイド弁
７、リリーフ弁１１、チェック弁６で回路を構成するこ
とにより、自重掘削，自重制御掘削，通常の圧入掘削と
３種類の掘削方式が選択できるため、掘削の効率がよく
なる。（２）４ポート３位置ソレノイド弁７の前にスロ
ットル弁８があるので、自重掘削及び自重制御掘削にお
いて、シリンダから出てくる油Ｑ１の流量を調整できる
ので、掘削時の速度を自由に設定することができ、掘削
の効率がよくなる。[Effect] The lifting cylinder 15 mounted on the lower end of the casing
An oil passage e is branched between an oil passage c on the expansion side and an oil passage d on the contraction side, and a check valve 6, a relief valve 11, and a throttle valve 8 are provided in the oil passage via a 4-port 3-position solenoid valve 7. The extension side pressure of the lifting cylinder 15 is controlled, the controlled oil is used as replenishing oil to the compression side (rod side), and surplus oil is returned to the tank T. Since the pressing force acting on the casing head is controlled in this way,
Wear and cutting of the bit provided in the casing head are reduced, and the casing can be efficiently excavated. In particular, (1) by forming a circuit with a 4-port 3-position solenoid valve 7, a relief valve 11, and a check valve 6, three types of excavation methods can be selected: self-weight excavation, self-weight control excavation, and normal press-in excavation. Excavation efficiency is improved. (2) 4 because the port 3 is the throttle valve 8 before the position solenoid valve 7, the self-weight drilling and self-weight control drilling, it is possible to adjust the flow rate of oil Q 1 coming out of the cylinder, free speed during excavation Can be set, and excavation efficiency is improved.
【図１】ケーシング圧入機の要部側面図。FIG. 1 is a side view of a main part of a casing press-fitting machine.
【図２】公知ケーシング掘削機の制御回路を示し、
（ａ）は回路図、（ｂ）はソレノイド弁の励磁表。FIG. 2 shows a control circuit of a known casing excavator,
(A) is a circuit diagram, (b) is an excitation table of a solenoid valve.
【図３】本発明の制御回路図で、（ａ）は回路図、
（ｂ）は励磁表。FIG. 3 is a control circuit diagram of the present invention, wherein (a) is a circuit diagram,
(B) Excitation table.
【図４】自重掘削時の回路図。FIG. 4 is a circuit diagram at the time of excavation of its own weight.
【図５】自重制御掘削時の回路図。FIG. 5 is a circuit diagram at the time of self-weight control excavation.
１ 油圧ポンプ ２ 縮用リリーフ弁 ３ ４ポート３位置ソレノイド弁 ４ リリーフ弁 ５ ４ポート３位置ソレノイド弁 ６ チェック弁 ７ ソレノイド弁 ８ スロットル弁 ９ チェック弁 １０ ４ポート２位
置ソレノイド弁 １１ リリーフ弁 １２ パイロットチ
ェック弁 １３ チェック弁 １４ カウンタバラ
ンス弁 １５ 昇降シリンダDESCRIPTION OF SYMBOLS 1 Hydraulic pump 2 Relief valve for compression 3 4 port 3 position solenoid valve 4 Relief valve 5 4 port 3 position solenoid valve 6 Check valve 7 Solenoid valve 8 Throttle valve 9 Check valve 10 4 port 2 position solenoid valve 11 Relief valve 12 Pilot check Valve 13 Check valve 14 Counterbalance valve 15 Elevating cylinder
Claims (1)
油圧ポンプ（１）からの圧油が、切替用の４ポート３位
置ソレノイド弁（５）を経てカウンタバランス弁（１
４）から昇降シリンダ（１５）の伸側の油路（ｃ）を経
て昇降シリンダ（１５）のシリンダヘッド側に送られ、
又ロッド側の油が縮側の油路（ｄ）を経て前記切替用の
４ポート３位置ソレノイド弁（５）からタンク（Ｔ）へ
戻り、又昇降シリンダ（１５）の縮み操作時は４ポート
３位置ソレイイド弁（５）を切替えることにより、油圧
ポンプ（１）からの圧油は前記切替用のソレノイド弁
（５）、昇降シリンダ（１５）の縮み側の油路（ｄ）を
経て昇降シリンダ（１５）のロッド側に送られ、シリン
ダヘッド側の油は伸側の油路（ｃ）、カウンタバランス
弁（１４）、ソレノイド弁（５）からタンク（Ｔ）へ戻
り、さらに差動回路時はソレノイド弁（１０）を励磁
し、油圧ポンプ（１）からの圧油でソレノイド弁（１
０）を介して油圧ポンプ（１）からの圧油をパイロット
圧として作用させることによってパイロットチェック弁
（１２）を逆流させ、該パイロットチェック弁（１２）
の両側に配設したチェック弁（９と１３）を介して縮側
の油路（ｄ）と伸側の油路（ｃ）とを連通させるよう構
成したケーシンング掘削機油圧回路において、 前記昇降シリンダ（１５）の伸側の油路（ｃ）から分岐
した分岐油路（ｅ）にスロットル弁（８）を介し切替用
の４ポート３位置ソレノイド弁（７）を接続し、該ソレ
ノイド弁（７）の中立位置では、前記分岐油路（ｅ）は
閉じられて、前記油圧ポンプ（１）からの圧油を切替え
るソレノイド弁（５）によって制御可能な回路となり、
分岐油路（ｅ）の前記ソレノイド弁（７）を一方に励磁
すると、昇降シリンダ（１５）の伸側から出る油
（Ｑ１）が伸側の油路（ｃ）を通り、分岐油路（ｅ）に
設けた前記スロットル弁（８）からソレノイド弁（７）
を通ってシリンダ縮側の油路（ｄ）側に流れる油
（Ｑ２）と、パイロットチェック弁（１２）の前に配し
たチェック弁（９）からリリーフ弁（４）を通って流れ
る油（Ｑ３）とに分岐する自重掘削回路と、 前記切替用のソレノイド弁（７）を他方に励磁すると、
昇降シリンダ（１５）の伸側からの油（Ｑ１）は伸側の
油路（ｃ）を通り、スロットル弁（８）から前記ソレノ
イド弁（７）を経てリリーフ弁（１１）を通ったのち、
さらに２つの流れに分岐し、分岐した一方の油（Ｑ２）
は前記ソレノイド弁（７）を経て縮側の油路（ｄ）を介
し昇降シリンダ（１５）の縮側に、又分岐した他方の油
（Ｑ３）はチェック弁（６）を通りタンク（Ｔ）へと流
れ自重制御掘削回路を構成するようにしたケーシング掘
削機の自重制御回路。When the elevating cylinder (15) is extended, hydraulic oil from a hydraulic pump (1) passes through a 4-port 3-position solenoid valve (5) for switching to a counterbalance valve (1).
4) is sent to the cylinder head side of the lifting cylinder (15) through the oil passage (c) on the extension side of the lifting cylinder (15),
Also, the oil on the rod side returns from the switching 4-port 3-position solenoid valve (5) to the tank (T) via the compression-side oil passage (d), and the port 4 when the lifting / lowering cylinder (15) is contracted. By switching the three-position solenoid valve (5), the hydraulic oil from the hydraulic pump (1) passes through the switching solenoid valve (5) and the hydraulic cylinder (15) on the contraction side of the lifting cylinder (15) to raise and lower the cylinder. The oil on the cylinder head side is sent to the rod side of (15), and returns to the tank (T) from the oil path (c) on the extension side, the counterbalance valve (14), and the solenoid valve (5), and then to the differential circuit. Excites the solenoid valve (10), and pressurizes the solenoid valve (1) with pressure oil from the hydraulic pump (1).
The pilot check valve (12) is caused to flow backward by causing the pressure oil from the hydraulic pump (1) to act as pilot pressure via the pilot check valve (12).
A hydraulic circuit for a casing excavator configured to communicate a contraction-side oil passage (d) and an extension-side oil passage (c) via check valves (9 and 13) disposed on both sides of the lifting cylinder. A switching 4-port 3-position solenoid valve (7) is connected via a throttle valve (8) to a branch oil path (e) branched from the oil path (c) on the extension side of (15), and the solenoid valve (7) is connected. In the neutral position, the branch oil passage (e) is closed to form a circuit that can be controlled by a solenoid valve (5) that switches hydraulic oil from the hydraulic pump (1),
When the solenoid valve (7) of the branch oil passage (e) is excited to one side, the oil (Q 1 ) coming out of the extension side of the lift cylinder (15) passes through the oil passage (c) on the extension side, and the branch oil passage ( e) from the throttle valve (8) to the solenoid valve (7)
(Q 2 ) flowing to the oil passage (d) side of the cylinder compression side through the valve and oil (Q 2 ) flowing from the check valve (9) disposed in front of the pilot check valve (12) through the relief valve (4). When the own weight excavation circuit branched to Q 3 ) and the switching solenoid valve (7) are excited to the other,
The oil (Q 1 ) from the extension side of the lifting cylinder (15) passes through the oil path (c) on the extension side, passes from the throttle valve (8), passes through the solenoid valve (7), and then passes through the relief valve (11). ,
Further, the oil is branched into two streams and one of the branched oils (Q 2 )
Passes through the solenoid valve (7) to the compression side of the lifting cylinder (15) via the compression-side oil passage (d), and the other branched oil (Q 3 ) passes through the check valve (6) to the tank (T). The weight control circuit of the casing excavator is configured to constitute a weight control drilling circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5323659A JP2908682B2 (en) | 1993-12-22 | 1993-12-22 | Weight control hydraulic circuit of casing excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5323659A JP2908682B2 (en) | 1993-12-22 | 1993-12-22 | Weight control hydraulic circuit of casing excavator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07180460A JPH07180460A (en) | 1995-07-18 |
| JP2908682B2 true JP2908682B2 (en) | 1999-06-21 |
Family
ID=18157180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5323659A Expired - Fee Related JP2908682B2 (en) | 1993-12-22 | 1993-12-22 | Weight control hydraulic circuit of casing excavator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2908682B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705279B (en) * | 2012-06-11 | 2015-08-26 | 山河智能装备股份有限公司 | Hydraulic static pile pressing machine presses normal pressure auto-changeover control loop soon |
| JP6434882B2 (en) * | 2015-09-30 | 2018-12-05 | 大容基功工業株式会社 | Underground continuous wall excavator and underground continuous wall excavation method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2549187Y2 (en) * | 1991-04-22 | 1997-09-30 | 三和機材株式会社 | Hydraulic circuit for opening and closing wedge type chuck in casing pusher |
-
1993
- 1993-12-22 JP JP5323659A patent/JP2908682B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07180460A (en) | 1995-07-18 |
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