JP6798681B2 - Operation mechanism of underground work equipment and how to use underground work equipment - Google Patents

Operation mechanism of underground work equipment and how to use underground work equipment Download PDF

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JP6798681B2
JP6798681B2 JP2016142014A JP2016142014A JP6798681B2 JP 6798681 B2 JP6798681 B2 JP 6798681B2 JP 2016142014 A JP2016142014 A JP 2016142014A JP 2016142014 A JP2016142014 A JP 2016142014A JP 6798681 B2 JP6798681 B2 JP 6798681B2
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fluid
cylinder chamber
flow path
side cylinder
expansion
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JP2018012944A (en
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山崎　一雄
一雄 山崎
荒井　昌彦
昌彦 荒井
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Sanwa Kizai Co Ltd
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Description

本発明は、掘削作業等を行う地中作業用装置の作動機構および地中作業用装置の使用方法に係るものである。 The present invention relates to an operating mechanism of an underground work device for performing excavation work and the like and a method of using the underground work device.

従来、下端に掘削刃を有するヘッドロッドに拡大翼の基部を回動自在に取付け、拡大翼を油圧シリンダにより格納位置と拡開位置との間回動するようにした構成は、公知である（特許文献１） Conventionally, a configuration is known in which the base of an expansion blade is rotatably attached to a head rod having an excavation blade at the lower end, and the expansion blade is rotated between a storage position and an expansion position by a hydraulic cylinder ( Patent Document 1)

特開２０１４−１１４５８７号公報Japanese Unexamined Patent Publication No. 2014-114587

前記公知例は、拡大翼を拡縮させる流体シリンダのピストンロッドを伸縮させるにあたり、タンクの流体を、流体ポンプにより流体シリンダの一方側シリンダ室または他方側シリンダ室に送ると、拡大翼を拡縮させるが、一方側シリンダ室または他方側シリンダ室に送られた流体は、夫々のシリンダ室内および一方側流路または他方側流路内に留まり循環することがない。
そのため、公知例の流体シリンダでは、流体シリンダを分解して流体中のエアーや異物の除去を行っていたので、面倒であるという課題がある。
即ち、流体カプラの接続を繰り返す等に起因して、流体シリンダを作動させる流体中にエアーや異物が混入するという課題があり、しかも、エアーや異物の除去のため、装置および装置に付属する流体シリンダを分解してメンテナンスしなければならず、メンテナンス作業が面倒となっていたのである。
本願は、流体シリンダを含めた作動機構を工夫し、エアーや異物除去のメンテナンス作業の容易化を図ったものである。 In the above-mentioned known example, when the piston rod of the fluid cylinder for expanding / contracting the expansion blade is expanded / contracted, when the fluid in the tank is sent to one side cylinder chamber or the other side cylinder chamber of the fluid cylinder by a fluid pump, the expansion blade is expanded / contracted. The fluid sent to the one-sided cylinder chamber or the other-side cylinder chamber stays in each cylinder chamber and in the one-sided flow path or the other-side flow path and does not circulate.
Therefore, the fluid cylinder of a known example has a problem that it is troublesome because the fluid cylinder is disassembled to remove air and foreign substances in the fluid.
That is, there is a problem that air and foreign matter are mixed into the fluid that operates the fluid cylinder due to repeated connection of the fluid coupler, and moreover, the fluid attached to the device and the device for removing the air and foreign matter. The cylinder had to be disassembled for maintenance, which made the maintenance work troublesome.
The present application has devised an operating mechanism including a fluid cylinder to facilitate maintenance work for removing air and foreign matter.

請求項１の発明は、作業用装置の地中作業である、地中に拡大穴を掘削する拡大翼５を備えた拡大ヘッドＨを設け、流体の圧力により前記拡大翼５を拡翼状態と閉翼状態とに作動させる流体シリンダ２を設け、該流体シリンダ２は、シリンダチューブ１２と、該シリンダチューブ１２内に挿入したピストンロッド１１を取付けたピストンヘッド１３と、シリンダチューブ１２内に設けた一方側シリンダ室１５と他方側シリンダ室１６とを有して構成し、流体シリンダ２の一方側シリンダ室１５と他方側シリンダ室１６の夫々に流体を送る流体ポンプ２０と、一方側シリンダ室１５と他方側シリンダ室１６の夫々に送る流体を貯留するタンク２２とを有して構成した流体回路中に、タンク２２から出た流体がタンク２２に戻るように流体回路内を流体が循環して流れるようにする循環手段３０を設けて構成し、該循環手段３０は、前記一方側シリンダ室１５と前記他方側シリンダ室１６とを所定条件にて連通させる連通手段３１を設けて構成し、該連通手段３１は、前記一方側シリンダ室１５と前記他方側シリンダ室１６とを連通させる圧力制御弁３２をピストンヘッド１３内に内蔵して構成し、前記流体ポンプ２０と流体シリンダ２との間に、流体を前記ピストンロッド１１を伸縮させる流路と循環用の流路とに切り替える伸縮循環切替バルブ２４と、一方側シリンダ室１５と他方側シリンダ室１６との何れかに流路を切替える切替バルブ１９と、ピストンロッド１１を伸縮させるために前記圧力制御弁３２を非連通状態に保持するように流体回路内の流体圧力を設定する伸縮圧力設定バルブ２５とを設け、流体シリンダ２からタンク２２へ流体を戻す戻し流路２３に除去手段３９を設け、前記拡大翼５が拡翼状態と閉翼状態との間の何れの位置においても、一方側シリンダ室１５および他方側シリンダ室１６内を含めてタンク２２から出た流体がタンク２２に戻るように循環して流れるように構成した地中作業用装置の作動機構としたものである。
請求項２の発明は、地中作業用装置のヘッドロッド３の外周にヘッドロッド３と平行な閉翼状態とヘッドロッド３に対して交差する拡翼状態とに拡縮する拡大翼５を、流体シリンダ２のシリンダチューブ１２の一方側シリンダ室１５と他方側シリンダ室１６との夫々に流体ポンプ２０により伸縮圧力設定バルブ２５を通してピストンヘッド１３に内蔵された循環手段３０の圧力制御弁３２の設定圧より低く減圧させてタンク２２から流体を送って、ピストンロッド１１を伸縮させることにより拡縮させて地中作業を行い、次に、地中作業中の拡大翼５の回転を停止させ、拡大翼５が拡翼あるいは閉翼の間の何れかの姿勢状態で、伸縮循環切替バルブ２４を切り替えて、流体ポンプ２０によりタンク２２内の流体を流路２１から伸縮圧力設定バルブ２５を通さずに、流体シリンダ２のピストンヘッド１３を移動させるよりも高圧の流体を流路切替えバルブ１９へ通し、流路切替えバルブ１９から他方側流路１８を通って他方側シリンダ室１６に流入させ、他方側シリンダ室１６内の流体圧により、ピストンヘッド１３に内蔵された循環手段３０の圧力制御弁３２を開き、他方側シリンダ室１６と一方側シリンダ室１５とを連通させ、他方側シリンダ室１６から一方側シリンダ室１５への流体の移動を許容し、一方側シリンダ室１５から一方側流路１７を介して戻し流路２３を通してタンク２２に戻る循環が行われ、この戻し流路２３に設けた除去手段３９により循環中の流体から異物を除去する地中作業用装置の使用方法としたものである。 The invention of claim 1 is to provide an expansion head H provided with an expansion wing 5 for excavating an expansion hole in the ground, which is an underground work of a work device, and the expansion wing 5 is brought into a wing expansion state by the pressure of a fluid. A fluid cylinder 2 that operates in a closed wing state is provided, and the fluid cylinder 2 is provided in a cylinder tube 12, a piston head 13 to which a piston rod 11 inserted in the cylinder tube 12 is attached, and a cylinder tube 12. A fluid pump 20 having a one-side cylinder chamber 15 and a other-side cylinder chamber 16 and sending fluid to each of the one-side cylinder chamber 15 and the other-side cylinder chamber 16 of the fluid cylinder 2, and the one-side cylinder chamber 15 The fluid circulates in the fluid circuit so that the fluid discharged from the tank 22 returns to the tank 22 in the fluid circuit composed of the tank 22 and the tank 22 for storing the fluid sent to each of the cylinder chamber 16 on the other side. The circulation means 30 for flowing is provided and configured, and the circulation means 30 is configured by providing a communication means 31 for communicating the one-side cylinder chamber 15 and the other-side cylinder chamber 16 under predetermined conditions. The communication means 31 has a pressure control valve 32 built in the piston head 13 for communicating the one-side cylinder chamber 15 and the other-side cylinder chamber 16, and is configured between the fluid pump 20 and the fluid cylinder 2. , A telescopic circulation switching valve 24 that switches the fluid between a flow path for expanding and contracting the piston rod 11 and a flow path for circulation, and a switching valve that switches the flow path to either one side cylinder chamber 15 or the other side cylinder chamber 16. 19 and a telescopic pressure setting valve 25 for setting the fluid pressure in the fluid circuit so as to hold the pressure control valve 32 in a non-communication state for expanding and contracting the piston rod 11 are provided, and the fluid cylinder 2 is provided with the tank 22. A removing means 39 is provided in the return flow path 23 for returning the fluid, and the expanding blade 5 includes the inside of the one-side cylinder chamber 15 and the other-side cylinder chamber 16 at any position between the expanded blade state and the closed blade state. This is an operating mechanism of an underground work device configured so that the fluid discharged from the tank 22 circulates and flows so as to return to the tank 22 .
The invention of claim 2 is to fluidize an expanding wing 5 that expands and contracts on the outer periphery of the head rod 3 of an underground work device into a closed wing state parallel to the head rod 3 and an expanded wing state intersecting the head rod 3. The set pressure of the pressure control valve 32 of the circulation means 30 built in the piston head 13 is passed through the expansion / contraction pressure setting valve 25 by the fluid pump 20 in each of the one-side cylinder chamber 15 and the other-side cylinder chamber 16 of the cylinder tube 12 of the cylinder 2. The pressure is reduced to a lower level, fluid is sent from the tank 22, and the piston rod 11 is expanded and contracted to perform underground work. Next, the rotation of the expansion blade 5 during the underground work is stopped, and the expansion blade 5 is stopped. The expansion / contraction circulation switching valve 24 is switched in either the expansion or closure position, and the fluid pump 20 allows the fluid in the tank 22 to flow from the flow path 21 without passing through the expansion / contraction pressure setting valve 25. A fluid having a pressure higher than that for moving the piston head 13 of the cylinder 2 is passed through the flow path switching valve 19, and flows from the flow path switching valve 19 through the other side flow path 18 into the other side cylinder chamber 16 to flow into the other side cylinder chamber 16. The pressure control valve 32 of the circulation means 30 built in the piston head 13 is opened by the fluid pressure in 16, the other side cylinder chamber 16 and the one side cylinder chamber 15 are communicated with each other, and the other side cylinder chamber 16 to the one side cylinder. Circulation is performed from the one-side cylinder chamber 15 to the tank 22 through the return flow path 23 via the one-side flow path 17 by allowing the fluid to move to the chamber 15, and the removing means 39 provided in the return flow path 23. it is obtained by the use of underground working apparatus for removing foreign matter from a fluid in circulation by.

請求項１の発明では、作動機構の流体回路中に循環手段３０を設けているので、タンク２２の流体は流体シリンダ２を通ってタンク２２に戻るように循環して、循環中の流体からエアーや異物の除去ができ、メンテナンス作業を容易にでき、循環手段３０は、一方側シリンダ室１５と他方側シリンダ室１６とを連通手段３１により連通させた状態で、流体を循環させることにより異物除去のメンテナンス作業を容易にでき、また、拡大翼５が拡翼状態と閉翼状態との間の何れの位置においても、循環させられるので、一層、操作性および作業性を向上させられることができる。
請求項２の発明では、作動機構の流体回路中に循環手段３０により、タンク２２の流体が流体回路中を循環させるので、装置や流体シリンダ２を分解せずに、エアーや異物除去のメンテナンス作業を容易にできる。 In the invention of claim 1, since the circulation means 30 is provided in the fluid circuit of the operating mechanism, the fluid in the tank 22 circulates so as to return to the tank 22 through the fluid cylinder 2 and air from the circulating fluid. And foreign matter can be removed, and maintenance work can be facilitated. The circulation means 30 removes foreign matter by circulating a fluid in a state where the one-side cylinder chamber 15 and the other-side cylinder chamber 16 are communicated by the communication means 31. Since the maintenance work of the above can be easily performed and the expansion blade 5 is circulated at any position between the expanded blade state and the closed blade state, the operability and workability can be further improved. ..
In the invention of claim 2, since the fluid of the tank 22 is circulated in the fluid circuit by the circulating means 30 in the fluid circuit of the operating mechanism, maintenance work for removing air and foreign matter without disassembling the device and the fluid cylinder 2 Can be easily done .

地中作業用装置の拡大翼の拡開状態側面図。A side view of the expanded wing of the underground work device in the expanded state. 流体回路図。Fluid circuit diagram. （Ａ）流体シリンダの伸長状態の流体回路図。 （Ｂ）流体シリンダの縮小状態の流体回路図。 （Ｃ）流体循環状態の流体回路図。(A) A fluid circuit diagram of a fluid cylinder in an extended state. (B) The fluid circuit diagram in the reduced state of the fluid cylinder. (C) Fluid circuit diagram in a fluid circulation state. 他の実施形態の流体回路図。Fluid schematics of other embodiments. 他の実施形態の、 （Ａ）流体シリンダの伸長状態の流体回路図。 （Ｂ）流体シリンダの縮小状態の流体回路図。 （Ｃ）流体循環状態の流体回路図。(A) A fluid circuit diagram of an extended state of a fluid cylinder according to another embodiment. (B) The fluid circuit diagram in the reduced state of the fluid cylinder. (C) Fluid circuit diagram in a fluid circulation state. （Ａ）他の実施形態の流体回路図。 （Ｂ）他の実施形態の流体回路図。(A) Fluid circuit diagram of another embodiment. (B) Fluid circuit diagram of another embodiment. 他の地中作業用装置の拡大翼の格納状態断面図。Cross-sectional view of the retracted state of the enlarged wing of other underground work equipment. 同一部拡大図。Enlarged view of the same part. 同拡大翼の拡開状態断面図。Cross-sectional view of the expanded wing in the expanded state. 他の地中作業用装置の側面図。Side view of other underground work equipment. 同作動状態横断面図。Cross-sectional view of the same operating state. 他の地中作業用装置の側面図。Side view of other underground work equipment.

本発明の一実施形態を図面により説明すると、本願は地中作業用装置１の各部を水・油等の流体圧力により作動させる流体シリンダ２により作動させ、図１の地中作業用装置１では、地盤に拡大穴を掘削する拡大ヘッドＨを有して構成している。
拡大ヘッドＨのヘッドロッド３の下端には掘削ヘッド４を設ける。掘削ヘッド４は地盤に縦坑を形成するものであり、ヘッドロッド３の径より大径に形成している。掘削ヘッド４の形状は本願の要件ではなく、任意形状のものでよい。
掘削ヘッド４より上方の所定位置のヘッドロッド３には、ヘッドロッド３と略平行の格納位置と掘削ヘッド４の掘削径よりも先端が外側に開いた拡開位置との間移動する一対の拡大翼５を設けており、この拡大翼５を流体シリンダ２により拡縮させる。 Explaining one embodiment of the present invention with reference to the drawings, in the present application, each part of the underground work device 1 is operated by a fluid cylinder 2 operated by a fluid pressure such as water or oil, and the underground work device 1 of FIG. , It is configured to have an expansion head H for excavating an expansion hole in the ground.
An excavation head 4 is provided at the lower end of the head rod 3 of the expansion head H. The excavation head 4 forms a vertical shaft in the ground, and is formed to have a diameter larger than the diameter of the head rod 3. The shape of the excavation head 4 is not a requirement of the present application, and may be an arbitrary shape.
The head rod 3 at a predetermined position above the excavation head 4 has a pair of enlargements that move between a storage position substantially parallel to the head rod 3 and an expansion position whose tip is open outward from the excavation diameter of the excavation head 4. A wing 5 is provided, and the expansion wing 5 is expanded or contracted by a fluid cylinder 2.

図２は、流体シリンダ２のピストンロッド１１を伸縮させるための、流体シリンダ２の模式図および流体回路を示し、流体シリンダ２のシリンダチューブ１２内に前記ピストンロッド１１の基部を取付けたピストンヘッド１３を挿入する。ピストンロッド１１と反対側のシリンダチューブ１２には一方側シリンダ室１５を形成し、ピストンヘッド１３を挟んで反対側のシリンダチューブ１２内には他方側シリンダ室１６を形成する。前記一方側シリンダ室１５には一方側流路１７の一端を接続する。前記他方側シリンダ室１６には他方側流路１８の一端を接続し、一方側流路１７および他方側流路１８の中間部には流路切替えバルブ１９を設け、流路切替えバルブ１９には流体ポンプ２０と流路２１により連結する。 FIG. 2 shows a schematic view of the fluid cylinder 2 and a fluid circuit for expanding and contracting the piston rod 11 of the fluid cylinder 2, and the piston head 13 in which the base of the piston rod 11 is mounted in the cylinder tube 12 of the fluid cylinder 2. To insert. A one-sided cylinder chamber 15 is formed in the cylinder tube 12 on the opposite side of the piston rod 11, and the other-side cylinder chamber 16 is formed in the cylinder tube 12 on the opposite side with the piston head 13 interposed therebetween. One end of the one-sided flow path 17 is connected to the one-sided cylinder chamber 15. One end of the other side flow path 18 is connected to the other side cylinder chamber 16, a flow path switching valve 19 is provided at an intermediate portion between the one side flow path 17 and the other side flow path 18, and the flow path switching valve 19 is provided. It is connected to the fluid pump 20 by a flow path 21.

２２はタンク、２３は戻し流路、２４は伸縮循環切替バルブ、２５は伸縮圧力設定バルブ、２６は伸縮循環切替バルブ２４から伸縮圧力設定バルブ２５へ至る流体シリンダ２の伸縮用流路、２７は伸縮圧力設定バルブ２５により所定圧の流体を流路２１に流す所定圧流路、２８は所定圧流路２７に設けた逆止弁、２９は戻し流路である。 22 is a tank, 23 is a return flow path, 24 is a telescopic circulation switching valve, 25 is a telescopic pressure setting valve, 26 is a telescopic flow path for the fluid cylinder 2 from the telescopic circulation switching valve 24 to the telescopic pressure setting valve 25, and 27 is a telescopic flow path. A predetermined pressure flow path for flowing a fluid of a predetermined pressure through the flow path 21 by the expansion / contraction pressure setting valve 25, 28 is a check valve provided in the predetermined pressure flow path 27, and 29 is a return flow path.

しかして、流体シリンダ２には、流体ポンプ２０によりタンク２２から送られた流体が流体シリンダ２の一方側シリンダ室１５と他方側シリンダ室１６の何れか一方から何れか他方に流れてタンク２２に戻るように、流体回路中の流体を循環させる循環手段３０を流体回路中に設ける。
従来では、タンク２２の流体は、流体ポンプ２０により一方側シリンダ室１５または他方側シリンダ室１６に送られると、シリンダチューブ１２とピストンヘッド１３とを相対的に移動させて拡大翼５を拡縮させるが、一方側シリンダ室１５または他方側シリンダ室１６に送られた流体は一方側流路１７または他方側流路１８内に夫々留まり、循環することがなく、流体中のエアーや異物の除去は流体シリンダ２を分解して行っていた。 Then, in the fluid cylinder 2, the fluid sent from the tank 22 by the fluid pump 20 flows from either one of the one-side cylinder chamber 15 and the other-side cylinder chamber 16 of the fluid cylinder 2 to the other to the tank 22. A circulation means 30 for circulating the fluid in the fluid circuit is provided in the fluid circuit so as to return.
Conventionally, when the fluid in the tank 22 is sent to the one-side cylinder chamber 15 or the other-side cylinder chamber 16 by the fluid pump 20, the cylinder tube 12 and the piston head 13 are relatively moved to expand or contract the expansion blade 5. However, the fluid sent to the one-side cylinder chamber 15 or the other-side cylinder chamber 16 stays in the one-side flow path 17 or the other-side flow path 18, respectively, and does not circulate, so that air and foreign matter in the fluid can be removed. The fluid cylinder 2 was disassembled.

本願は、流体シリンダ２内の一方側シリンダ室１５と他方側シリンダ室１６内の流体が循環手段３０により流体回路内を循環可能に構成することにより、流体シリンダ２を分解することなく、流体中のエアーや異物の除去を可能にしている。
循環手段３０の構成は任意であるが、例えば、一方側シリンダ室１５と他方側シリンダ室１６とを所定条件にて連通させる連通手段３１により構成する。連通手段３１は、一方側シリンダ室１５または他方側シリンダ室１６内の流体圧が所定圧以上になると、一方側シリンダ室１５または他方側シリンダ室１６の何れか他方への流体の移動を許容する構成とする。
本願の連通手段３１は、一方側シリンダ室１５内の流体圧が所定圧以上になると作動する圧力制御弁３２をピストンヘッド１３内に設けて構成している。
３３はピストンヘッド１３の入口流路、３４は同出口流路、３５は弾性体である。 In the present application, the fluid in the one-side cylinder chamber 15 and the other-side cylinder chamber 16 in the fluid cylinder 2 is configured to be able to circulate in the fluid circuit by the circulation means 30, so that the fluid cylinder 2 is not decomposed in the fluid. It enables the removal of air and foreign matter.
The configuration of the circulation means 30 is arbitrary, but for example, the circulation means 31 is configured to communicate the one-side cylinder chamber 15 and the other-side cylinder chamber 16 under predetermined conditions. The communication means 31 allows the fluid to move to either the one-side cylinder chamber 15 or the other-side cylinder chamber 16 when the fluid pressure in the one-side cylinder chamber 15 or the other-side cylinder chamber 16 becomes a predetermined pressure or higher. It is configured.
The communication means 31 of the present application is configured by providing a pressure control valve 32 in the piston head 13 that operates when the fluid pressure in the cylinder chamber 15 on one side becomes equal to or higher than a predetermined pressure.
33 is an inlet flow path of the piston head 13, 34 is an outlet flow path, and 35 is an elastic body.

しかして、流体回路の流体ポンプ２０の流体送出圧力を、例えば、仮に２０ＭＰａとし、圧力制御弁３２の通過圧を１５ＭＰａとし、伸縮圧力設定バルブ２５の通過圧を１０ＭＰａと設定した場合、図３（Ａ）のように、流体ポンプ２０が送出する流体は伸縮圧力設定バルブ２５により一部は戻し流路２９を通ってタンク２２に戻り、伸縮圧力設定バルブ２５により１０ＭＰａとなった流体が所定圧流路２７により逆止弁２８を通過して一方側流路１７に入り、一方側流路１７からシリンダチューブ１２の一方側シリンダ室１５に送られてピストンロッド１１を伸長させる。反対に、図３（Ｂ）のように、流路切替えバルブ１９を切り替えて、伸縮圧力設定バルブ２５により
１０ＭＰａとなった流体は所定圧流路２７と逆止弁２８を通って、流路切替えバルブ１９により他方側流路１８を通ってシリンダチューブ１２の他方側シリンダ室１６に入って、ピストンロッド１１を圧縮（縮小）させる。
この場合、圧力制御弁３２の通過圧は１５ＭＰａなので、１０ＭＰａの流体は圧力制御弁３２を通過せず、流体シリンダ２を確実に伸縮作動させる。 When the fluid delivery pressure of the fluid pump 20 of the fluid circuit is set to, for example, 20 MPa, the passing pressure of the pressure control valve 32 is set to 15 MPa, and the passing pressure of the expansion / contraction pressure setting valve 25 is set to 10 MPa, FIG. As in A), the fluid delivered by the fluid pump 20 is partially returned to the tank 22 through the expansion / contraction pressure setting valve 25 through the return flow path 29, and the fluid whose volume is 10 MPa by the expansion / contraction pressure setting valve 25 is the predetermined pressure flow path. 27 passes through the check valve 28, enters the one-sided flow path 17, and is sent from the one-sided flow path 17 to the one-sided cylinder chamber 15 of the cylinder tube 12 to extend the piston rod 11. On the contrary, as shown in FIG. 3B, the flow path switching valve 19 is switched, and the fluid that has become 10 MPa by the expansion / contraction pressure setting valve 25 passes through the predetermined pressure flow path 27 and the check valve 28, and the flow path switching valve. 19 enters the other side cylinder chamber 16 of the cylinder tube 12 through the other side flow path 18 and compresses (reduces) the piston rod 11.
In this case, since the passing pressure of the pressure control valve 32 is 15 MPa, the fluid of 10 MPa does not pass through the pressure control valve 32, and the fluid cylinder 2 is reliably expanded and contracted.

次に、伸縮循環切替バルブ２４を循環用に切り替えると、図３（Ｃ）のように、流体ポンプ２０からの２０ＭＰａの流体は伸縮循環切替バルブ２４により、伸縮用流路２６を通らずに流路２１と一方側流路１７を通って一方側シリンダ室１５に入る。
そのため、伸縮圧力設定バルブ２５により減圧されていないので、一方側シリンダ室１５内の流体は循環手段（連通手段３１（圧力制御弁３２））３０を通過して他方側シリンダ室１６に入り、他方側シリンダ室１６から他方側流路１８と流路切替えバルブ１９と戻し流路２３を通ってタンク２２に戻り循環する。
そして、流路切替えバルブ１９からタンク２２に戻る戻し流路２３にエアー抜きおよび異物を除去する除去手段（フィルタ）３９を設け（図２〜図６）、循環して戻し流路２３を通る流体は除去手段３９によりエアーおよび異物が除去される。 Next, when the expansion / contraction circulation switching valve 24 is switched for circulation, as shown in FIG. 3C, the 20 MPa fluid from the fluid pump 20 flows by the expansion / contraction circulation switching valve 24 without passing through the expansion / contraction flow path 26. It enters the one-sided cylinder chamber 15 through the road 21 and the one-sided flow path 17.
Therefore, since the pressure is not reduced by the expansion / contraction pressure setting valve 25, the fluid in the cylinder chamber 15 on one side passes through the circulation means (communication means 31 (pressure control valve 32)) 30 and enters the cylinder chamber 16 on the other side, and the other It returns to the tank 22 from the side cylinder chamber 16 through the other side flow path 18, the flow path switching valve 19, and the return flow path 23, and circulates.
Then, a removing means (filter) 39 for bleeding air and removing foreign matter is provided in the return flow path 23 returning from the flow path switching valve 19 to the tank 22 (FIGS. 2 to 6), and the fluid circulates and passes through the return flow path 23. Air and foreign matter are removed by the removing means 39.

なお、圧力制御弁３２は、ピストンヘッド１３に一つ設ければ、連通手段３１として成立するが、圧力制御弁３２の入口流路３３と出口流路３４の向きは任意であり、図２のピストンヘッド１３では一方側シリンダ室１５から他方側シリンダ室１６へ流体が流れるように圧力制御弁３２を配置しているが、図４のピストンヘッド１３では他方側シリンダ室１６から一方側流路１７へ流体が流れるように圧力制御弁３２を配置している。
そして、図４のように、圧力制御弁３２を配置した場合、図５（Ａ）のように、ピストンロッド１１を伸長させ、図５（Ｂ）のように、ピストンロッド１１を圧縮させ、図５（Ｃ）のように、流体を循環させる。 If one pressure control valve 32 is provided in the piston head 13, it can be established as a communication means 31, but the directions of the inlet flow path 33 and the outlet flow path 34 of the pressure control valve 32 are arbitrary, and FIG. 2 shows. In the piston head 13, the pressure control valve 32 is arranged so that the fluid flows from the one-side cylinder chamber 15 to the other-side cylinder chamber 16, but in the piston head 13 of FIG. 4, the one-side flow path 17 is arranged from the other-side cylinder chamber 16. The pressure control valve 32 is arranged so that the fluid flows to the cylinder.
Then, when the pressure control valve 32 is arranged as shown in FIG. 4, the piston rod 11 is extended as shown in FIG. 5 (A), and the piston rod 11 is compressed as shown in FIG. 5 (B). The fluid is circulated as in 5 (C).

また、連通手段３１（圧力制御弁３２）を内蔵のピストンヘッド１３を設けた流体シリンダ２は、連通手段３１（圧力制御弁３２）を有しない既存の拡大ヘッドＨに設けた流体シリンダ２と交換設置してもよい。
また、ピストンヘッド１３内に連通手段３１を設けない場合では、図６のように、シリンダチューブ１２外の一方側流路１７と他方側流路１８とを連通するバイパス流路３８とバイパス流路３８に設けた、連通手段３１（圧力制御弁３２）により循環手段３０を構成してもよい。 Further, the fluid cylinder 2 provided with the piston head 13 having the communication means 31 (pressure control valve 32) is replaced with the fluid cylinder 2 provided in the existing expansion head H having no communication means 31 (pressure control valve 32). It may be installed.
When the communication means 31 is not provided in the piston head 13, the bypass flow path 38 and the bypass flow path that communicate the one side flow path 17 and the other side flow path 18 outside the cylinder tube 12 are as shown in FIG. The circulation means 30 may be configured by the communication means 31 (pressure control valve 32) provided in the 38.

この場合、図６（Ａ）では、一方側流路１７からバイパス流路３８の圧力制御弁３２を通って他方側流路１８に流れて循環するが、図６（Ｂ）では、他方側流路１８からバイパス流路３８の圧力制御弁３２を通って一方側流路１７に流れて循環する。
しかして、図１の拡大ヘッドＨ内を、図７のように拡大ヘッドＨのヘッドロッド３内に流体シリンダ２を内蔵した構成とした場合では、拡大翼５の基部は横軸４０によりヘッドロッド３側に回動自在に取付け、横軸４０にはアーム４１の基部を固定する。アーム４１の先端はヘッドロッド３に内蔵した流体シリンダ２のシリンダチューブ１２の外周に形成した係合凹部４２に係合させる。 In this case, in FIG. 6 (A), the flow flows from one side flow path 17 through the pressure control valve 32 of the bypass flow path 38 to the other side flow path 18 and circulates, but in FIG. 6 (B), the other side flow flows. It flows from the path 18 through the pressure control valve 32 of the bypass flow path 38 to the one-side flow path 17 and circulates.
Therefore, in the case where the fluid cylinder 2 is built in the head rod 3 of the expansion head H as shown in FIG. 7, the base of the expansion blade 5 is head rod by the horizontal axis 40. It is rotatably attached to the 3 side, and the base of the arm 41 is fixed to the horizontal shaft 40. The tip of the arm 41 is engaged with an engaging recess 42 formed on the outer periphery of the cylinder tube 12 of the fluid cylinder 2 built in the head rod 3.

この流体シリンダ２では、ピストンヘッド１３の上下位置は変わらず、ピストンヘッド１３に対してシリンダチューブ１２を上下移動させる構成にしており、ピストンヘッド１３の下側が一方側シリンダ室１５に、ピストンヘッド１３の上側が他方側シリンダ室１６となり、ピストンヘッド１３に対してシリンダチューブ１２が下降すると拡大翼５が拡大し、ピストンヘッド１３に対してシリンダチューブ１２が上昇すると拡大翼５を格納する構成としている。
そして、図８のように、一方側流路１７と他方側流路１８の間に設けたバイパス流路３８に循環手段３０（圧力制御弁３２）を設けており、他方側流路１８から所定圧以上で流体が流れると、圧力制御弁３２を介して他方側流路１８に一方側流路１７を連通させ、他方側流路１８から一方側流路１７によりタンク２２に戻して循環させる構成としている。 In this fluid cylinder 2, the vertical position of the piston head 13 does not change, and the cylinder tube 12 is moved up and down with respect to the piston head 13. The lower side of the piston head 13 is in the cylinder chamber 15 on one side, and the piston head 13 is located. The upper side of the cylinder chamber 16 is on the other side, and when the cylinder tube 12 descends with respect to the piston head 13, the expansion blade 5 expands, and when the cylinder tube 12 rises with respect to the piston head 13, the expansion blade 5 is stored. ..
Then, as shown in FIG. 8, a circulation means 30 (pressure control valve 32) is provided in the bypass flow path 38 provided between the one side flow path 17 and the other side flow path 18, and is predetermined from the other side flow path 18. When the fluid flows above the pressure, the one-sided flow path 17 communicates with the other-side flow path 18 via the pressure control valve 32, and the other-side flow path 18 returns to the tank 22 by the one-side flow path 17 to circulate. It is supposed to be.

また、図１０、１１の拡大ヘッドＨでは、
一対の拡大アーム４５を流体シリンダ２のシリンダチューブ１２とすると共に、シリンダチューブ１２をピストンヘッド１３に対して伸縮移動させる構成とし、流体シリンダ２のピストンヘッド１３内に循環手段３０（圧力制御弁３２）を設けており、上側の拡大アーム４５において、ピストンヘッド１３の右側を一方側シリンダ室１５とし、一方側シリンダ室１５に流体が流入すると、拡大アーム４５が伸長（拡大）し、ピストンヘッド１３の左側を他方側シリンダ室１６とし、他方側シリンダ室１６に流体が流入すると、拡大アーム４５が縮小（格納）し、他方側シリンダ室１６内の流体圧が所定圧以上になると、図１１の模式図のように、流体が他方側シリンダ室１６からピストンヘッド１３の循環手段３０（圧力制御弁３２）を通って一方側シリンダ室１５に入り、一方側シリンダ室１５から一方側流路１７によりタンク２２に戻って循環する。 Further, in the enlarged head H of FIGS. 10 and 11,
The pair of expansion arms 45 are formed as the cylinder tube 12 of the fluid cylinder 2, and the cylinder tube 12 is expanded and contracted with respect to the piston head 13, and the circulation means 30 (pressure control valve 32) is formed in the piston head 13 of the fluid cylinder 2. ) Is provided, and the right side of the piston head 13 is the one-side cylinder chamber 15 in the upper expansion arm 45, and when fluid flows into the one-side cylinder chamber 15, the expansion arm 45 expands (expands) and the piston head 13 The left side of the cylinder chamber 16 is the other side cylinder chamber 16, and when fluid flows into the other side cylinder chamber 16, the expansion arm 45 contracts (stores), and when the fluid pressure in the other side cylinder chamber 16 becomes equal to or higher than a predetermined pressure, FIG. As shown in the schematic diagram, fluid enters the one-side cylinder chamber 15 from the other-side cylinder chamber 16 through the circulation means 30 (pressure control valve 32) of the piston head 13, and enters the one-side cylinder chamber 15 from the one-side cylinder chamber 15 through the one-side flow path 17. It returns to the tank 22 and circulates.

また、図１２の掘削ヘッドＨでは、この掘削ヘッドＨに一つの伸縮アーム４６を設け、伸縮アーム４６を流体シリンダ２ののシリンダチューブ１２とすると共に、シリンダチューブ１２をピストンヘッド１３に対して伸縮移動させる構成とし、掘削孔を掘削する際に、伸縮アーム４６が伸縮して掘削孔の内周に当接して、地中作業用装置１が垂直状態を保持するように傾斜修正する構成としている。
この掘削ヘッドＨでは、流体シリンダ２のピストンヘッド１３内に循環手段３０（圧力制御弁３２）を設けており、伸縮アーム４６ではピストンヘッド１３の左側を一方側シリンダ室１５とし、一方側シリンダ室１５に流体が流入すると、拡大アーム４５が伸長（拡大）し、ピストンヘッド１３の右側を他方側シリンダ室１６とし、他方側シリンダ室１６に流体が流入すると、伸縮アーム４６が縮小（格納）し、他方側シリンダ室１６内の流体圧が所定圧以上になると、流体が他方側シリンダ室１６から循環手段３０（圧力制御弁３２）を通って一方側シリンダ室１５に入り、一方側シリンダ室１５から一方側流路１７によりタンク２２に戻って循環する。 Further, in the excavation head H of FIG. 12, one telescopic arm 46 is provided in the excavation head H, the telescopic arm 46 is used as the cylinder tube 12 of the fluid cylinder 2, and the cylinder tube 12 is expanded and contracted with respect to the piston head 13. The structure is such that when the excavation hole is excavated, the telescopic arm 46 expands and contracts and comes into contact with the inner circumference of the excavation hole, and the underground work device 1 is tilted and corrected so as to maintain the vertical state. ..
In this excavation head H, a circulation means 30 (pressure control valve 32) is provided in the piston head 13 of the fluid cylinder 2, and in the telescopic arm 46, the left side of the piston head 13 is a one-side cylinder chamber 15 and a one-side cylinder chamber. When the fluid flows into 15, the expansion arm 45 expands (expands), the right side of the piston head 13 becomes the other side cylinder chamber 16, and when the fluid flows into the other side cylinder chamber 16, the expansion / contraction arm 46 contracts (stores). When the fluid pressure in the other side cylinder chamber 16 becomes equal to or higher than a predetermined pressure, the fluid enters the one side cylinder chamber 15 from the other side cylinder chamber 16 through the circulation means 30 (pressure control valve 32), and enters the one side cylinder chamber 15 It returns to the tank 22 and circulates through the one-sided flow path 17.

（実施形態の作用）
本発明は、上記の構成であり、図１の地中作業用装置１では、拡大翼５を閉翼した状態で、ヘッドロッド３を回転させて掘削ヘッド４により地盤を掘削して、所定深さの竪穴を掘削する。
そして、図１の地中作業用装置１を、図３の油圧回路で、図３（Ａ）のように、流体シリンダ２のシリンダチューブ１２の一方側（伸長用）シリンダ室１５に送油すると、ピストンヘッド１３が上昇して、これにより、拡大翼５を拡開させて拡大掘削を行って拡大穴を掘削する。 (Action of Embodiment)
The present invention has the above-mentioned configuration, and in the underground work device 1 of FIG. 1, the ground is excavated by the excavation head 4 by rotating the head rod 3 with the expansion blade 5 closed, and the predetermined depth is obtained. Excavate the pit.
Then, when the underground work device 1 of FIG. 1 is supplied with the hydraulic circuit of FIG. 3 to the cylinder chamber 15 on one side (extension) of the cylinder tube 12 of the fluid cylinder 2 as shown in FIG. 3 (A). , The piston head 13 rises, thereby expanding the expansion blade 5 and performing expansion excavation to excavate an expansion hole.

反対に、図３の油圧回路で、図３（Ｂ）のように、流体シリンダ２のシリンダチューブ１２の他方側（伸長用）シリンダ室１６に送油すると、ピストンヘッド１３が下降して、これにより、拡大翼５を閉翼させて格納する。
上記の場合、流体シリンダ２には、流体ポンプ２０によりタンク２２から送られた流体が流体シリンダ２の一方側（伸長用）シリンダ室１５と他方側（縮小用）シリンダ室１６の何れか一方から何れか他方に流れてタンク２２に戻るように、流体を循環させる循環手段３０を設けているので、所定条件になると、流体シリンダ２内の一方側シリンダ室１５と他方側シリンダ室１６内の流体が循環手段３０により流体回路内を循環し、循環中に除去手段３９により流体中のエアーや異物の除去できる。 On the contrary, when oil is supplied to the other side (extension) cylinder chamber 16 of the cylinder tube 12 of the fluid cylinder 2 as shown in FIG. 3B in the hydraulic circuit of FIG. 3, the piston head 13 is lowered, which is The expansion wing 5 is closed and stored.
In the above case, in the fluid cylinder 2, the fluid sent from the tank 22 by the fluid pump 20 is sent from either one side (extension) cylinder chamber 15 or the other side (reduction) cylinder chamber 16 of the fluid cylinder 2. Since the circulation means 30 for circulating the fluid is provided so as to flow to either one and return to the tank 22, the fluid in the one-side cylinder chamber 15 and the other-side cylinder chamber 16 in the fluid cylinder 2 is satisfied under predetermined conditions. Circulates in the fluid circuit by the circulation means 30, and air and foreign matter in the fluid can be removed by the removing means 39 during the circulation.

そのため、流体中のエアーや異物の除去は、流体シリンダ２を分解することなく行えるので、エアー・異物除去作業を容易にする。
しかして、循環手段３０の構成は任意であるが、例えば、循環手段３０を、一方側（伸長用）シリンダ室１５または他方側（縮小用）シリンダ室１６内の流体圧が所定以上になると作動する、連通手段３１（圧力制御弁３２）をピストンヘッド１３内に設けて構成すると、一方側（伸長用）シリンダ室１５または他方側（縮小用）シリンダ室１６内の流体圧が所定以上になると、連通手段３１（圧力制御弁３２）は他方側（縮小用）シリンダ室１６への流体の移動を許容し、流体をタンク２２に戻して循環させる。 Therefore, the air and foreign matter in the fluid can be removed without disassembling the fluid cylinder 2, which facilitates the air and foreign matter removal work.
The configuration of the circulation means 30 is arbitrary, but for example, the circulation means 30 operates when the fluid pressure in the cylinder chamber 15 on one side (extension) or the cylinder chamber 16 on the other side (reduction) becomes equal to or higher than a predetermined value. When the communication means 31 (pressure control valve 32) is provided in the piston head 13 and the fluid pressure in the cylinder chamber 15 on one side (extension) or the cylinder chamber 16 on the other side (reduction) becomes equal to or higher than a predetermined value. , The communication means 31 (pressure control valve 32) allows the fluid to move to the other side (for reduction) cylinder chamber 16 and returns the fluid to the tank 22 to circulate.

即ち、例えば、図３（Ｃ）のように、拡大翼５を拡開させた状態で、流体ポンプ２０によりタンク２２内の流体を一方側（伸長用）シリンダ室１５に送ると、一方側（伸長用）シリンダ室１５内の流体圧が所定圧以上となって、循環手段３０（圧力制御弁３２）により他方側（縮小用）シリンダ室１６への流体が移動が許容され、他方側流路１８から戻し流路２３を通ってタンク２２に戻って循環し、戻し流路２３によりタンク２２に戻るときに、除去手段３９により流体中のエアーや異物が除去される。
また、例えば、図５（Ｃ）のように、拡大翼５を閉翼した状態で、流体ポンプ２０によりタンク２２内の流体を他方側（縮小用）シリンダ室１６に送ると、他方側（縮小用）シリンダ室１６内の流体圧が所定圧以上になって、循環手段３０（圧力制御弁３２）により一方側（伸長用）シリンダ室１５への移動が許容され、一方側流路１７から戻し流路２３を通ってタンク２２に戻って循環し、戻し流路２３に設けた除去手段３９により流体中のエアーや異物が除去される。 That is, for example, as shown in FIG. 3C, when the fluid in the tank 22 is sent to the cylinder chamber 15 on one side (for extension) by the fluid pump 20 in the state where the expansion blade 5 is expanded, one side (for extension) When the fluid pressure in the cylinder chamber 15 (for extension) becomes equal to or higher than a predetermined pressure, the fluid is allowed to move to the cylinder chamber 16 on the other side (for reduction) by the circulation means 30 (pressure control valve 32), and the flow path on the other side is allowed. Air and foreign matter in the fluid are removed by the removing means 39 when the return flow path 23 returns to the tank 22 and circulates through the return flow path 23 and returns to the tank 22 by the return flow path 23.
Further, for example, as shown in FIG. 5C, when the fluid in the tank 22 is sent to the other side (for reduction) cylinder chamber 16 by the fluid pump 20 with the expansion blade 5 closed, the other side (reduction) is sent. (For) When the fluid pressure in the cylinder chamber 16 becomes equal to or higher than a predetermined pressure, the circulation means 30 (pressure control valve 32) allows movement to the one side (for extension) cylinder chamber 15, and returns from the one side flow path 17. It returns to the tank 22 through the flow path 23 and circulates, and air and foreign matter in the fluid are removed by the removing means 39 provided in the return flow path 23.

同様に、図６では、シリンダチューブ１２外の一方側流路１７と他方側流路１８とを連通するバイパス流路３８とバイパス流路３８に設けた、連通手段３１（圧力制御弁３２）とにより循環手段３０を構成しているので、例えば、図６（Ａ）では、一方側シリンダ室１５内の流体圧が所定圧以上になると、一方側流路１７から他方側流路１８への流体の移動を、連通手段３１（圧力制御弁３２）が許容し、流体は流体回路中を循環して除去手段３９により異物が除去される。
また、図６（Ｂ）では、他方側シリンダ室１６内の流体圧が所定圧以上になると、他方側流路１８から一方側流路１７への流体の移動を、連通手段３１（圧力制御弁３２）が許容し、流体は流体回路中を循環して除去手段３９により異物が除去される。 Similarly, in FIG. 6, the bypass flow path 38 that communicates the one-side flow path 17 and the other-side flow path 18 outside the cylinder tube 12 and the communication means 31 (pressure control valve 32) provided in the bypass flow path 38. Therefore, for example, in FIG. 6A, when the fluid pressure in the one-side cylinder chamber 15 becomes equal to or higher than a predetermined pressure, the fluid from the one-side flow path 17 to the other-side flow path 18 is formed. The communication means 31 (pressure control valve 32) allows the fluid to move, and the fluid circulates in the fluid circuit to remove foreign matter by the removing means 39.
Further, in FIG. 6B, when the fluid pressure in the other side cylinder chamber 16 becomes equal to or higher than a predetermined pressure, the communication means 31 (pressure control valve) moves the fluid from the other side flow path 18 to the one side flow path 17. 32) allows, the fluid circulates in the fluid circuit and the foreign matter is removed by the removing means 39.

しかして、図１の地中作業用装置１が図７のように構成されている場合では、地中作業用装置１のヘッドロッド３に内蔵された流体シリンダ２は、ピストンヘッド１３は上下動せず、ピストンヘッド１３に対してシリンダチューブ１２を上下移動させる構成にしており、ピストンヘッド１３の下側が一方側（下降側）シリンダ室１５に、ピストンヘッド１３の上側が他方側シリンダ室１６となっているので、流体シリンダ２のシリンダチューブ１２の一方側（下降側）シリンダ室１５に流体を送ってピストンヘッド１３に対してシリンダチューブ１２を下降させ、シリンダチューブ１２の下降により拡大翼５を拡開させて拡大掘削を行って拡大穴を掘削する。 Then, when the underground work device 1 of FIG. 1 is configured as shown in FIG. 7, the piston head 13 of the fluid cylinder 2 built in the head rod 3 of the underground work device 1 moves up and down. Instead, the cylinder tube 12 is moved up and down with respect to the piston head 13, and the lower side of the piston head 13 is the one side (lowering side) cylinder chamber 15, and the upper side of the piston head 13 is the other side cylinder chamber 16. Therefore, fluid is sent to the cylinder chamber 15 on one side (lowering side) of the cylinder tube 12 of the fluid cylinder 2 to lower the cylinder tube 12 with respect to the piston head 13, and the expanding blade 5 is lowered by lowering the cylinder tube 12. Expand and excavate to excavate an expansion hole.

反対に、流体シリンダ２のシリンダチューブ１２の他方側（上昇側）シリンダ室１６に流体を送ってピストンヘッド１３に対してシリンダチューブ１２を上昇させ、シリンダチューブ１２の上昇により拡大翼５を格納する。 On the contrary, the fluid is sent to the cylinder chamber 16 on the other side (rising side) of the cylinder tube 12 of the fluid cylinder 2 to raise the cylinder tube 12 with respect to the piston head 13, and the expansion blade 5 is stored by raising the cylinder tube 12. ..

この実施形態では、図７，８のように、流体シリンダ２のシリンダチューブ１２外に、連通手段３１（圧力制御弁３２）を設けており、図６（Ｂ）の油圧回路を採用しているので、伸縮循環切替バルブ２４を切り替えると、流体ポンプ２０によりタンク２２内の流体は流路２１から流路切替えバルブ１９を通って、流路切替えバルブ１９から他方側流路１８を通って他方側（上昇側）シリンダ室１６に至り、他方側（上昇側）シリンダ室１６内の流体圧により、循環手段３０（連通手段３１（圧力制御弁３２））はバイパス流路３８を通して一方側（下降側）流路１７への流体の移動を許容し（図８）、一方側流路１７から戻し流路２３を通ってタンク２２に戻る循環が行われ、この戻し流路２３に設けた除去手段３９により流体中のエアーや異物が除去される。 In this embodiment, as shown in FIGS. 7 and 8, the communication means 31 (pressure control valve 32) is provided outside the cylinder tube 12 of the fluid cylinder 2, and the hydraulic circuit of FIG. 6 (B) is adopted. Therefore, when the expansion / contraction circulation switching valve 24 is switched, the fluid in the tank 22 is passed from the flow path 21 through the flow path switching valve 19 and from the flow path switching valve 19 through the other side flow path 18 to the other side by the fluid pump 20. Due to the fluid pressure in the (rising side) cylinder chamber 16 and the other side (rising side) cylinder chamber 16, the circulation means 30 (communication means 31 (pressure control valve 32)) is passed through the bypass flow path 38 to one side (downward side). ) Allowing the movement of the fluid to the flow path 17 (FIG. 8), circulation is performed from the one-side flow path 17 through the return flow path 23 to the tank 22, and the removing means 39 provided in the return flow path 23. Removes air and foreign matter in the fluid.

また、図１０、１１の拡大ヘッドＨでは、ピストンヘッド１３は左右移動せず、ピストンヘッド１３に対してシリンダチューブ１２を左右移動させる構成にしており、一方側（伸長）シリンダ室１５に流体が流入すると拡大アーム４５が伸長（拡大）し、他方側（縮小）シリンダ室１６に流体が流入すると拡大アーム４５が縮小（格納）する。
そして、他方側（縮小）シリンダ室１６内の流体圧が所定圧以上になると、流体が他方側（縮小）シリンダ室１６から循環手段３０（連通手段３１（圧力制御弁３２））を通って一方側（伸長）シリンダ室１５に入り、一方側（伸長）シリンダ室１５から一方側流路１７によりタンク２２に戻って循環が行われ、この戻し流路２３に設けた除去手段３９により流体中のエアーや異物が除去される。 Further, in the enlarged head H of FIGS. 10 and 11, the piston head 13 does not move left and right, but the cylinder tube 12 is moved left and right with respect to the piston head 13, and the fluid flows into the cylinder chamber 15 on one side (extension). When the fluid flows in, the expansion arm 45 expands (expands), and when the fluid flows into the cylinder chamber 16 on the other side (reduction), the expansion arm 45 contracts (stores).
Then, when the fluid pressure in the other side (reduced) cylinder chamber 16 becomes equal to or higher than a predetermined pressure, the fluid flows from the other side (reduced) cylinder chamber 16 through the circulation means 30 (communication means 31 (pressure control valve 32)). It enters the side (extension) cylinder chamber 15, returns from the one side (extension) cylinder chamber 15 to the tank 22 by the one side flow path 17, and circulates in the fluid by the removing means 39 provided in the return flow path 23. Air and foreign matter are removed.

また、図１２の掘削ヘッドＨでは、伸縮アーム４６ではピストンヘッド１３の左側を一方側シリンダ室１５とし、一方側シリンダ室１５に流体が流入すると、伸縮アーム４６が伸長（拡大）し、他方側シリンダ室１６に流体が流入すると、伸縮アーム４６が縮小（格納）し、他方側シリンダ室１６内の流体圧が所定圧以上になると、流体が他方側シリンダ室１６から流体シリンダ２のピストンヘッド１３内に設けた循環手段３０（連通手段３１（圧力制御弁３２））を通って一方側シリンダ室１５に入り、一方側シリンダ室１５から一方側流路１７によりタンク２２に戻って循環する。 Further, in the excavation head H of FIG. 12, in the telescopic arm 46, the left side of the piston head 13 is the one-side cylinder chamber 15, and when fluid flows into the one-side cylinder chamber 15, the telescopic arm 46 expands (expands) and the other side. When the fluid flows into the cylinder chamber 16, the telescopic arm 46 contracts (stores), and when the fluid pressure in the other side cylinder chamber 16 exceeds a predetermined pressure, the fluid flows from the other side cylinder chamber 16 to the piston head 13 of the fluid cylinder 2. It enters the one-side cylinder chamber 15 through the circulation means 30 (communication means 31 (pressure control valve 32)) provided inside, and returns to the tank 22 from the one-side cylinder chamber 15 through the one-side flow path 17 to circulate.

１…地中作業用装置、２…流体シリンダ、３…ヘッドロッド、４…掘削ヘッド 、５…拡大翼、１１…ピストンロッド、１２…シリンダチューブ、１３…ピストンヘッド、１５…一方側シリンダ室、１６…他方側シリンダ室、１７…一方側流路、１８…他方側流路、１９…流路切替えバルブ、２０…流体ポンプ、２１…流路、２２…タンク、２３…戻し流路、２４…伸縮循環切替バルブ、２５…伸縮圧力設定バルブ、２６…伸縮用流路、２７…所定圧流路、２８…逆止弁、２９…戻し流路、３０…循環手段、３１…連通手段、３２…圧力制御弁、３３…入口流路、３４…出口流路、３５…弾性体、３８…バイパス流路、３９…除去手段、４０…横軸、４１…アーム、４２…係合凹部、４５…拡大アーム、４６…伸縮アーム。 1 ... Underground work equipment, 2 ... Fluid cylinder, 3 ... Head rod, 4 ... Excavation head, 5 ... Expansion blade, 11 ... Piston rod, 12 ... Cylinder tube, 13 ... Piston head, 15 ... One side cylinder chamber, 16 ... the other side cylinder chamber, 17 ... one side flow path, 18 ... the other side flow path, 19 ... flow path switching valve, 20 ... fluid pump, 21 ... flow path, 22 ... tank, 23 ... return flow path, 24 ... Telescopic circulation switching valve, 25 ... Telescopic pressure setting valve, 26 ... Telescopic flow path, 27 ... Predetermined pressure flow path, 28 ... Check valve, 29 ... Return flow path, 30 ... Circulation means, 31 ... Communication means, 32 ... Pressure Control valve, 33 ... inlet flow path, 34 ... outlet flow path, 35 ... elastic body, 38 ... bypass flow path, 39 ... removal means, 40 ... horizontal axis, 41 ... arm, 42 ... engaging recess, 45 ... expansion arm , 46 ... Telescopic arm.

Claims (2)

作業用装置の地中作業である、地中に拡大穴を掘削する拡大翼５を備えた拡大ヘッドＨを設け、流体の圧力により前記拡大翼５を拡翼状態と閉翼状態とに作動させる流体シリンダ２を設け、該流体シリンダ２は、シリンダチューブ１２と、該シリンダチューブ１２内に挿入したピストンロッド１１を取付けたピストンヘッド１３と、シリンダチューブ１２内に設けた一方側シリンダ室１５と他方側シリンダ室１６とを有して構成し、流体シリンダ２の一方側シリンダ室１５と他方側シリンダ室１６の夫々に流体を送る流体ポンプ２０と、一方側シリンダ室１５と他方側シリンダ室１６の夫々に送る流体を貯留するタンク２２とを有して構成した流体回路中に、タンク２２から出た流体がタンク２２に戻るように流体回路内を流体が循環して流れるようにする循環手段３０を設けて構成し、該循環手段３０は、前記一方側シリンダ室１５と前記他方側シリンダ室１６とを所定条件にて連通させる連通手段３１を設けて構成し、該連通手段３１は、前記一方側シリンダ室１５と前記他方側シリンダ室１６とを連通させる圧力制御弁３２をピストンヘッド１３内に内蔵して構成し、前記流体ポンプ２０と流体シリンダ２との間に、流体を前記ピストンロッド１１を伸縮させる流路と循環用の流路とに切り替える伸縮循環切替バルブ２４と、一方側シリンダ室１５と他方側シリンダ室１６との何れかに流路を切替える切替バルブ１９と、ピストンロッド１１を伸縮させるために前記圧力制御弁３２を非連通状態に保持するように流体回路内の流体圧力を設定する伸縮圧力設定バルブ２５とを設け、流体シリンダ２からタンク２２へ流体を戻す戻し流路２３に除去手段３９を設け、前記拡大翼５が拡翼状態と閉翼状態との間の何れの位置においても、一方側シリンダ室１５および他方側シリンダ室１６内を含めてタンク２２から出た流体がタンク２２に戻るように循環して流れるように構成した地中作業用装置の作動機構。 An expansion head H provided with an expansion wing 5 for excavating an expansion hole in the ground, which is an underground work of a work device , is provided, and the expansion wing 5 is operated in a wing expansion state and a wing closed state by the pressure of a fluid. A fluid cylinder 2 is provided, and the fluid cylinder 2 includes a cylinder tube 12, a piston head 13 to which a piston rod 11 inserted in the cylinder tube 12 is attached, a one-side cylinder chamber 15 provided in the cylinder tube 12, and the other. A fluid pump 20 having a side cylinder chamber 16 and sending fluid to each of the one side cylinder chamber 15 and the other side cylinder chamber 16 of the fluid cylinder 2, and the one side cylinder chamber 15 and the other side cylinder chamber 16. Circulation means 30 that allows the fluid to circulate and flow in the fluid circuit so that the fluid discharged from the tank 22 returns to the tank 22 in the fluid circuit having the tank 22 for storing the fluid to be sent to each. The circulation means 30 is configured by providing a communication means 31 for communicating the one-side cylinder chamber 15 and the other-side cylinder chamber 16 under predetermined conditions, and the communication means 31 is configured by providing the one. A pressure control valve 32 for communicating the side cylinder chamber 15 and the other side cylinder chamber 16 is built in the piston head 13, and fluid is introduced between the fluid pump 20 and the fluid cylinder 2 in the piston rod 11. A telescopic circulation switching valve 24 that switches between a flow path for expanding and contracting and a flow path for circulation, a switching valve 19 that switches the flow path to either one side cylinder chamber 15 or the other side cylinder chamber 16, and a piston rod 11. A expansion / contraction pressure setting valve 25 for setting the fluid pressure in the fluid circuit so as to hold the pressure control valve 32 in a non-communication state for expansion and contraction is provided, and a return flow path 23 for returning the fluid from the fluid cylinder 2 to the tank 22 is provided. The removing means 39 is provided in the tank 22, and the fluid discharged from the tank 22 including the inside of the one-side cylinder chamber 15 and the other-side cylinder chamber 16 at any position between the expanded blade state and the closed blade state. An operating mechanism of an underground work device configured to circulate and flow so that the cylinder returns to the tank 22 . 地中作業用装置のヘッドロッド３の外周にヘッドロッド３と平行な閉翼状態とヘッドロッド３に対して交差する拡翼状態とに拡縮する拡大翼５を、流体シリンダ２のシリンダチューブ１２の一方側シリンダ室１５と他方側シリンダ室１６との夫々に流体ポンプ２０により伸縮圧力設定バルブ２５を通してピストンヘッド１３に内蔵された循環手段３０の圧力制御弁３２の設定圧より低く減圧させてタンク２２から流体を送って、ピストンロッド１１を伸縮させることにより拡縮させて地中作業を行い、次に、地中作業中の拡大翼５の回転を停止させ、拡大翼５が拡翼あるいは閉翼の間の何れかの姿勢状態で、伸縮循環切替バルブ２４を切り替えて、流体ポンプ２０によりタンク２２内の流体を流路２１から伸縮圧力設定バルブ２５を通さずに、流体シリンダ２のピストンヘッド１３を移動させるよりも高圧の流体を流路切替えバルブ１９へ通し、流路切替えバルブ１９から他方側流路１８を通って他方側シリンダ室１６に流入させ、他方側シリンダ室１６内の流体圧により、ピストンヘッド１３に内蔵された循環手段３０の圧力制御弁３２を開き、他方側シリンダ室１６と一方側シリンダ室１５とを連通させ、他方側シリンダ室１６から一方側シリンダ室１５への流体の移動を許容し、一方側シリンダ室１５から一方側流路１７を介して戻し流路２３を通してタンク２２に戻る循環が行われ、この戻し流路２３に設けた除去手段３９により循環中の流体から異物を除去する地中作業用装置の使用方法。 On the outer periphery of the head rod 3 of the underground work device, an expansion blade 5 that expands and contracts in a closed state parallel to the head rod 3 and an expanded state intersecting the head rod 3 is provided on the cylinder tube 12 of the fluid cylinder 2. The fluid pump 20 passes through the expansion / contraction pressure setting valve 25 in each of the one-side cylinder chamber 15 and the other-side cylinder chamber 16 to reduce the pressure to be lower than the set pressure of the pressure control valve 32 of the circulation means 30 built in the piston head 13, and the tank 22. A fluid is sent from the piston rod 11 to expand and contract it to perform underground work, and then the rotation of the expansion wing 5 during the underground work is stopped, and the expansion wing 5 is expanded or closed. In any of the postures, the expansion / contraction circulation switching valve 24 is switched, and the fluid in the tank 22 is not passed through the expansion / contraction pressure setting valve 25 from the flow path 21 by the fluid pump 20 , and the piston head 13 of the fluid cylinder 2 is moved. A fluid having a higher pressure than moving is passed through the flow path switching valve 19, flows from the flow path switching valve 19 through the other side flow path 18 into the other side cylinder chamber 16, and is caused by the fluid pressure in the other side cylinder chamber 16. The pressure control valve 32 of the circulation means 30 built in the piston head 13 is opened to communicate the other side cylinder chamber 16 and the one side cylinder chamber 15, and the fluid moves from the other side cylinder chamber 16 to the one side cylinder chamber 15. Is allowed, circulation is performed from the one-side cylinder chamber 15 to the tank 22 through the return flow path 23 via the one-side flow path 17, and foreign matter is removed from the circulating fluid by the removing means 39 provided in the return flow path 23. How to use the underground work equipment to remove.
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