JP3074545B2 - Crane boom raising device for construction machinery - Google Patents
Crane boom raising device for construction machineryInfo
- Publication number
- JP3074545B2 JP3074545B2 JP04094988A JP9498892A JP3074545B2 JP 3074545 B2 JP3074545 B2 JP 3074545B2 JP 04094988 A JP04094988 A JP 04094988A JP 9498892 A JP9498892 A JP 9498892A JP 3074545 B2 JP3074545 B2 JP 3074545B2
- Authority
- JP
- Japan
- Prior art keywords
- boom
- hydraulic
- cylinder
- valve
- elevating cylinder
- 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
- Jib Cranes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は移動式の穴掘り機や溝掘
さく機その他の建設機械に用いられるクレーン、特にブ
ームが若干前倒れ状態で吊荷負荷を支持する建設機械用
クレーンに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane used for a mobile excavator, a trench excavator, and other construction machines, and more particularly to a crane for a construction machine which supports a suspended load with a boom slightly tilted forward.
【０００２】[0002]
【従来の技術】従来このようなクレーンでは、移動時に
ブームを略水平に倒伏させねばならないし、作業時には
ブームを略垂直近くに起立保持するブーム俯仰シリンダ
が工具や吊荷の取扱いや昇降を妨げる恐れをなくさねば
ならないから、ブームの控え索張設側において、機台と
ブームとの間にブーム俯仰シリンダを連結するのが普通
である。（例えば実公昭３７−２３６３７号公報参照）2. Description of the Related Art Conventionally, in such a crane, the boom must be laid substantially horizontally when moving, and a boom elevating cylinder which stands and holds the boom almost vertically during operation hinders handling and lifting and lowering of tools and suspended loads. Since fear must be eliminated, it is common to connect a boom elevating cylinder between the platform and the boom on the boom staying side. (See, for example, Japanese Utility Model Publication No. 37-23637)
【０００３】しかしこの従来技術では、工具や吊荷の作
業半径即ちブーム傾斜角を増減調節する際は、控え索の
巻取りウインチ等を回転自在として、ブーム俯仰シリン
ダを伸縮制御することによりブーム傾斜角を調節し、次
いで控え索をその巻取りウインチ等の操作により緊張さ
せることによつて、ブームをその位置に固定支持させる
のが普通であるから、ブーム傾斜角の調節操作がまこと
に面倒であるのみならず、クレーン運転者の他に控え索
巻取りウインチの操作作業員を必要とし、省力化上の問
題を生ずる。However, in this prior art, when increasing or decreasing the working radius of a tool or a suspended load, that is, the boom tilt angle, the winding winch of the stay cable is rotatable and the boom tilt cylinder is controlled to extend and contract to control the boom tilt. It is common to fix the boom in that position by adjusting the angle and then tensioning the stay line by manipulating the winding winch or the like, so the operation of adjusting the boom tilt angle is very troublesome. Not only that, but also a crane operator and an operator of the cable hoisting winch are required, which causes a problem of labor saving.
【０００４】又ブーム傾斜角を増減調節する際は、前述
のようにブーム俯仰シリンダだけで行うのであるから、
大口径深穴の穴掘り機のようにブーム俯仰シリンダの負
荷が著しく大きくなる場合には、該ブーム俯仰シリンダ
のパツキンの損傷によつて油漏れを生じ易く、ブームを
所定傾斜角に停止させることができなくなると云う問題
を生ずる。[0004] Also, when increasing or decreasing the boom tilt angle, the boom tilt cylinder is used only as described above.
If the load on the boom elevating cylinder becomes extremely large, as in a large-diameter deep-hole excavator, oil leakage is likely to occur due to damage to the packing of the boom elevating cylinder, and the boom must be stopped at a predetermined inclination angle. The problem that it becomes impossible to do it occurs.
【０００５】例えば図３に鎖線で示した前倒れ位置
（イ）のブームを、ブーム俯仰シリンダの収縮によつて
同図実線示の垂直に近い位置（ロ）に起立させる際に
は、ブーム基端のフートピンを支点としてブームを起立
させようとするブーム俯仰シリンダ収縮力のモーメント
アームは、ブームが前倒れ位置にある場合より垂直に近
い位置の方へ起立するにつれ次第に増大するに対し、吊
荷負荷によつてブームを倒伏させようとするモーメント
は、ブームが前倒れ位置にある場合より垂直に近い位置
の方へ起立するにつれ次第に小さくなるから、ピストン
受圧面積が小さいブーム俯仰シリンダの上部油室に供給
される油圧は著しく増減変動し、従つてブーム傾斜角を
頻繁に増減調節する穴掘り作業時などには、ブーム俯仰
シリンダのパツキンが損傷して油漏れを生じ易くなり、
控え索を緊張させるまでの間に、所定傾斜角に設定した
ブームの傾斜角、即ち掘さく位置が狂うことになる。For example, when the boom at the forward tilt position (a) shown by the chain line in FIG. 3 is raised to a position (b) near the vertical shown by the solid line in FIG. The moment arm of the boom elevating cylinder contraction force, which attempts to raise the boom with the end foot pin as a fulcrum, gradually increases as the boom rises closer to the vertical than when the boom is in the forward leaning position. The moment that the boom is caused to fall by the load gradually decreases as the boom stands closer to the vertical than when the boom is in the forward leaning position.Therefore, the upper oil chamber of the boom elevating cylinder having a small piston pressure receiving area. The hydraulic pressure supplied to the boiler fluctuates significantly, so during drilling work where the boom tilt angle is frequently adjusted, the packing of the boom elevating cylinder is damaged. Will tend to cause oil leakage and,
Until the stay cable is tensioned, the tilt angle of the boom set at the predetermined tilt angle, that is, the digging position, will be out of order.
【０００６】[0006]
【発明が解決しようとする課題】本発明はブーム俯仰シ
リンダによるブームの俯仰如何に拘らず、控え索を略一
定の緊張状態に維持すると共に、該ブーム俯仰シリンダ
の収縮時にその上部油室に生ずる高圧を、一定の控え索
張力によるモーメントによつて減殺して、上記問題を解
決することを目的とする。SUMMARY OF THE INVENTION The present invention maintains the stay line in a substantially constant tension state regardless of whether the boom is raised by the boom elevating cylinder, and generates an upper oil chamber when the boom elevating cylinder is contracted. An object of the present invention is to solve the above problem by reducing high pressure by a moment due to a constant stay rope tension.
【０００７】[0007]
【課題を解決するための手段】本発明はブーム俯仰シリ
ンダを制御する３位置の方向切換弁と、該ブーム俯仰シ
リンダの伸，縮作動時にのみ、控え索の巻胴を巻取り方
向に駆動すべき油圧モータの油圧入口に、その作動油圧
源と控え索張力制限用リリーフ弁とを並列に接続するよ
うに、前記方向切換弁に連動して制御される油圧モータ
制御回路とを含み、常時制動付勢されている巻胴用ブレ
ーキ装置のブレーキ解放シリンダの作動油室をタンクに
接続する常時位置を備え、該作動油室をブーム俯仰シリ
ンダの伸，縮作動時にのみ前記油圧源に接続するよう
に、前記方向切換弁に連動して切換えられる切換弁を油
圧モータ制御回路に挿入し、ブーム俯仰シリンダの伸，
縮作動時には控え索が常に緊張しているように構成した
ものである。SUMMARY OF THE INVENTION The present invention provides a three-way directional control valve for controlling a boom elevating cylinder, and drives a staying line bobbin in a winding direction only when the boom elevating cylinder is extended or retracted. A hydraulic motor control circuit that is controlled in conjunction with the direction switching valve so as to connect a hydraulic pressure source of the hydraulic motor to be operated and a relief cable for restraining cable tension in parallel to a hydraulic motor control circuit. A constant position is provided for connecting the hydraulic oil chamber of the brake release cylinder of the energized winding cylinder brake device to the tank, and the hydraulic oil chamber is connected to the hydraulic pressure source only when the boom elevating cylinder is extended or retracted. Then, a switching valve that is switched in conjunction with the direction switching valve is inserted into the hydraulic motor control circuit, and the extension and extension of the boom raising cylinder is performed.
When the retracting operation is performed, the stay cable is configured to be always tense.
【０００８】[0008]
【実施例】図１は本発明の一実施例を示し、ブーム俯仰
シリンダ制御回路１は、該ブーム俯仰シリンダ３の上下
油室４，５に夫々リリーフ弁付き第１油圧源６の油圧を
給排するタンデムセンタ形の３位置の方向切換弁７と、
該ブーム俯仰シリンダ側における上下油室への給排油路
８，９の途中に夫々挿入したカウンタバランス弁１０，
１１とを含み、該両カウンタバランス弁のパイロツト油
路１０ａ，１１ａは夫々他側の給排油路９，８に接続さ
れている。尚Ｔはタンクを示す。FIG. 1 shows an embodiment of the present invention. A boom raising cylinder control circuit 1 supplies hydraulic pressure of a first hydraulic power source 6 with a relief valve to upper and lower oil chambers 4 and 5 of the boom raising cylinder 3 respectively. A tandem center type three-position directional control valve 7 to be discharged;
Counter balance valves 10, 10 inserted in the middle of supply / drain oil passages 8, 9 to the upper and lower oil chambers on the boom raising cylinder side,
The pilot oil passages 10a and 11a of the counter balance valves are connected to supply / discharge oil passages 9 and 8 on the other side, respectively. T indicates a tank.
【０００９】控え索の巻胴１２に連動連結した油圧モー
タ１３の制御回路２は、該油圧モータを控え索の巻取り
方向に正転させる第２油圧源１４と、控え索の張力を制
限するリリーフ弁１５と、巻胴を停止するよう常時圧縮
ばね等により制動付勢されている巻胴用ブレーキ装置の
ブレーキ解放シリンダ１６とを含み、控え索の巻取り時
における油圧モータ１３の油圧入口１３ａと、ブレーキ
解放シリンダ１６の作動油室１６ａとをタンクＴに接続
する図示の常時位置と、該油圧入口１３ａと作動油室１
６ａとを第２油圧源１４とリリーフ弁１５とに接続する
切換位置とを備えるパイロツト操作の切換弁１７を油圧
モータ制御回路２に挿入している。A control circuit 2 of a hydraulic motor 13 operatively connected to the winding line 12 of the stay cable controls a second hydraulic power source 14 for rotating the hydraulic motor forward in the winding direction of the stay cable, and limits the tension of the stay cable. A hydraulic pressure inlet 13a of the hydraulic motor 13 includes a relief valve 15 and a brake release cylinder 16 of a winding cylinder brake device which is constantly biased by a compression spring or the like so as to stop the winding cylinder. , The hydraulic oil chamber 16a of the brake release cylinder 16 is connected to the tank T, and the hydraulic oil inlet 13a and the hydraulic oil chamber 1
A switching valve 17 for pilot operation, which has a switching position connecting the second hydraulic pressure source 6a to the second hydraulic pressure source 14 and the relief valve 15, is inserted into the hydraulic motor control circuit 2.
【００１０】従つてブーム俯仰シリンダ制御用方向切換
弁７のＡ，Ｂポート相互の間に、その高圧側ポートの油
圧を取出す高圧選択弁（シヤトル弁）１８を接続して、
該取出し油圧によつて切換弁１７をパイロツト操作１７
ａさせることにより、該切換弁１７を方向切換弁７に連
動して切換位置に切換えるようにしている。Accordingly, a high pressure selection valve (shuttle valve) 18 for taking out the oil pressure of the high pressure side port is connected between the A and B ports of the directional control valve 7 for controlling the boom raising cylinder.
The switching valve 17 is operated by the pilot pressure 17 by the removal hydraulic pressure.
As a result, the switching valve 17 is switched to the switching position in conjunction with the direction switching valve 7.
【００１１】以上油圧モータ１３とブレーキ解放シリン
ダ１６とを駆動するため、第２の油圧源（油圧ポンプ）
１４を設けた実施例について説明したが、この第２の油
圧源を設ける代りに第１の油圧源（油圧ポンプ）６を利
用することもできる。図２はその場合の実施例で、同図
中、図１と同じ符号を付した部材は相対応する部材を示
す。As described above, the second hydraulic source (hydraulic pump) is used to drive the hydraulic motor 13 and the brake release cylinder 16.
Although the embodiment provided with 14 has been described, the first hydraulic source (hydraulic pump) 6 can be used instead of providing the second hydraulic source. FIG. 2 shows an embodiment in such a case. In FIG. 2, members denoted by the same reference numerals as those in FIG. 1 indicate corresponding members.
【００１２】図２の実施例においては、ブーム俯仰シリ
ンダ制御用方向切換弁７のＡ，Ｂポートに夫々分流弁１
９，２０を接続して、該両分流弁１９，２０のブーム俯
仰シリンダ非作動側の出力ポートＤ，Ｄ間に、その高圧
側ポートの油圧を取出す高圧選択弁（シヤトル弁）２１
を接続し、該高圧選択弁２１の油圧取出油路２２に、控
え索巻取り時における油圧モータ１３の油圧入口１３ａ
と、リリーフ弁１５と、ブレーキ解放シリンダ１６を制
御する絞り付きの切換弁２３とを並列に接続し、図示の
常時位置においては該切換弁２３がブレーキ解放シリン
ダ１６の作動油室１６ａをタンクＴに接続しているが、
油圧取出油路２２に高圧選択弁２１の取出し油圧が作用
した時は、該取出し油圧によつて切換弁２３がパイロツ
ト操作２３ａされて、該作動油室１６ａに油圧取出油路
２２の油圧が作用し、巻胴用ブレーキ装置を解放するこ
とは前実施例と同様である。In the embodiment shown in FIG. 2, the diversion valve 1 is connected to the A and B ports of the directional control valve 7 for controlling the boom raising cylinder.
A high-pressure selection valve (shuttle valve) 21 for connecting between the output ports D and D on the non-operating side of the boom elevating cylinders of the two flow dividing valves 19 and 20 to extract the hydraulic pressure of the high-pressure port.
And a hydraulic inlet 13a of the hydraulic motor 13 at the time of take-up rope winding is connected to the hydraulic take-out oil passage 22 of the high-pressure selection valve 21.
, A relief valve 15 and a switching valve 23 with a throttle for controlling the brake release cylinder 16 are connected in parallel, and the switching valve 23 connects the hydraulic oil chamber 16a of the brake release cylinder 16 to the tank T Connected to
When the removal oil pressure of the high-pressure selection valve 21 acts on the hydraulic removal oil passage 22, the switching valve 23 is piloted 23a by the removal oil pressure, and the oil pressure of the hydraulic removal oil passage 22 acts on the hydraulic oil chamber 16a. The release of the winding drum brake device is the same as in the previous embodiment.
【００１３】尚各分流弁１９，２０は夫々第１油圧源６
より供給される入力油圧を、ブーム俯仰シリンダ作動側
の出力ポートＣと、その非作動側出力ポートＤとから、
該両出力ポートＣ，Ｄの負荷圧力の大小如何に関係な
く、一定比率で流量を分割して出力することは勿論であ
る。Each of the flow dividing valves 19 and 20 is connected to the first hydraulic pressure source 6 respectively.
The input hydraulic pressure supplied from the boom elevating cylinder operating side output port C and the non-operating side output port D is
It is a matter of course that the flow rate is divided and output at a fixed ratio regardless of the magnitude of the load pressure of the output ports C and D.
【００１４】又２４はブレーキ解放用の非常弁で、常時
は図示の下位置に切換えられている該非常弁２４を上位
置に切換えた時は、補助油圧源２５の油圧が順次油路２
６，シヤトル弁２７，切換位置の切換弁２３を介してブ
レーキ解放シリンダ１６の作動油室１６ａに供給され
て、巻胴用ブレーキ装置を解放するが、ブーム俯仰シリ
ンダを制御する場合は、該非常弁２４を図示の下位置に
維持して油路２６をタンクＴに接続し、切換弁２３が油
圧取出油路２２の取出し油圧によつてのみ切換位置に切
換えられるようにしている。Reference numeral 24 denotes an emergency valve for releasing the brake. When the emergency valve 24, which is normally switched to the lower position in the figure, is switched to the upper position, the hydraulic pressure of the auxiliary hydraulic source 25 is sequentially applied to the oil passage 2.
6, supplied to the hydraulic oil chamber 16a of the brake release cylinder 16 through the shuttle valve 27 and the switching valve 23 at the switching position to release the brake device for the winding cylinder. When controlling the boom elevating cylinder, the emergency The oil passage 26 is connected to the tank T while the valve 24 is maintained at the lower position in the figure, so that the switching valve 23 can be switched to the switching position only by the hydraulic pressure of the hydraulic oil passage 22.
【００１５】図３は本発明を適用する大口径深穴の穴掘
り機の実施例を示し、クローラ走行装置２８を備える機
台２９と、その前端部上にフートピン３１で俯仰自在に
枢架された門形或いは枠形のブーム３０との間には、該
ブームの控え索張設側において左右一対のブーム俯仰シ
リンダ３が連結され、又上端をブーム３０の上端に止着
或いは係止３２した左右一対の控え索３３の下端は夫々
機台２９の後端に取付けた左右一対の巻胴１２に巻付け
られている。尚図１及び図２の実施例においては、製図
の簡略化上、ブーム俯仰シリンダ３や巻胴１２を１個だ
け図示しているが、これらは機台２９の両側に夫々設け
られているものとする。FIG. 3 shows an embodiment of a large-diameter and deep-hole excavator to which the present invention is applied. A pair of left and right boom elevating cylinders 3 are connected to the gate-shaped or frame-shaped boom 30 on the side of the staying cable extension side of the boom, and the upper end is fixed or locked 32 to the upper end of the boom 30. The lower ends of the pair of left and right stay lines 33 are wound around a pair of left and right winding drums 12 attached to the rear end of the machine base 29, respectively. In the embodiment shown in FIGS. 1 and 2, only one boom raising cylinder 3 and one winding drum 12 are shown for simplification of drawing, but these are provided on both sides of the machine base 29, respectively. And
【００１６】３４は機台２９上に取付けた油圧駆動のウ
インチを示し、該ウインチ３４より繰出された１本の巻
索３５はブーム３０の上端滑車装置を経由してハンマグ
ラブバケツト３６を吊下げ、該巻索３５と協同して該ハ
ンマグラブバケツトの下端掘さく刃３６ａを開閉制御す
るクラウン３７は、ブーム上端の滑車装置を経由する左
右一対の吊索３８に吊下げ支持され、該クラウン３７と
ブーム上端との間の吊索長さを鎖線示のブーム前倒れ位
置（イ）と実線示の垂直に近い位置（ロ）とに示すよう
に調節するクラウン昇降調節装置３９がブーム上部に取
付けられており、ブーム３０の（ロ）位置においてハン
マグラブバケツト３６をウインチ３４で昇降させること
により穴を掘さくし、掘さく土は前倒れ位置（ロ）に傾
動した鎖線示のブームより該バケツト３６及びクラウン
３７を鎖線示のように降下させて排出するのであるが、
このような技術は特開平３−２０８９８２号公報等によ
り従前開示されている所である。Numeral 34 denotes a hydraulically driven winch mounted on the machine base 29. One of the ropes 35 extended from the winch 34 suspends a hammer grab bucket 36 via a pulley device at the upper end of the boom 30. A crown 37 for lowering and controlling opening and closing of a lower excavating blade 36a of the hammer club bucket in cooperation with the winding cable 35 is suspended and supported by a pair of left and right suspension cables 38 passing through a pulley device at the upper end of the boom. A crown elevating and lowering adjusting device 39 for adjusting the length of the sling cable between the crown 37 and the upper end of the boom as shown in a chain-line front boom falling position (a) and a solid line near vertical position (b) is provided at the top of the boom. The hole is dug by raising and lowering the hammer grab bucket 36 with the winch 34 at the (b) position of the boom 30, and the excavated soil is tilted to the forward falling position (b). Although for discharging it is lowered as the chain line indicates the Baketsuto 36 and crown 37 from beam,
Such a technique has been disclosed in Japanese Patent Application Laid-Open No. 3-208982 and the like.
【００１７】尚２９ａは機台２９の前端に取付けた平面
Ｕ字状の作業台、４０は該作業台２９ａを水平支持する
４個の前部ジヤツキ、４１は作業台２９ａに押下げ或い
は引上げ可能に支持されて、ケーシングチューブ４２を
穴掘りに先行して回転させながら押込む回転圧入装置、
４３は機台２９の後端を支持する後部ジヤツキ、４４は
運転室を示す。Reference numeral 29a denotes a flat U-shaped work table attached to the front end of the machine base 29, 40 denotes four front jacks which horizontally support the work table 29a, and 41 denotes a work table which can be pushed down or pulled up to the work table 29a. A rotary press-fitting device that is pushed in while rotating the casing tube 42 prior to digging,
43 denotes a rear jack supporting the rear end of the machine base 29, and 44 denotes an operator cab.
【００１８】[0018]
【作用】負荷を吊つたブームの前倒れ状態において、そ
の傾斜角を大きくするため、中立位置の３位置方向切換
弁が、ブーム俯仰シリンダの上部油室側に負荷に応じた
高圧の作動油圧を供給すると共に、その下部油室の油を
タンクに排出するブーム俯仰シリンダ収縮位置に切換え
られると、これに連動して控え索巻取り時における油圧
モータの圧油入口とブレーキ解放シリンダの作動油室と
に油圧源（油圧ポンプ）から油圧が供給され、従つて該
油圧モータによつて巻胴が控え索を巻取り緊張させる。In order to increase the angle of inclination of the boom with the load hung forward, a three-position directional control valve in the neutral position applies a high-pressure operating oil pressure corresponding to the load to the upper oil chamber side of the boom elevating cylinder. When the boom elevating cylinder is switched to the retracted position of the boom elevating cylinder that supplies oil and discharges the oil in the lower oil chamber to the tank, the hydraulic oil chamber of the hydraulic motor and the hydraulic oil chamber of the brake release cylinder are operated in conjunction with this. At the same time, hydraulic pressure is supplied from a hydraulic source (hydraulic pump), and the hydraulic motor causes the bobbin to wind and tighten the stay line.
【００１９】その際油圧ポンプ（容積形ポンプ）では負
荷によつて吐出圧力が決まり、負荷即ち控え索張力が過
大になると吐出圧力が上昇するが、最大吐出圧力はリリ
ーフ弁によつて制限されるから、ブームの前倒れ状態に
おいて該ブームをブーム俯仰シリンダの収縮と、巻胴に
よる控え索の巻取りとにより引起こす際に控え索の受持
つ負荷が過大になる恐れはなく、控え索の引張力でブー
ムを引起こすモーメント（これはブームを引起こすブー
ム俯仰シリンダ収縮力のモーメントアームに比しモーメ
ントアームが著しく大きいのが普通である）に応じてブ
ーム俯仰シリンダ収縮力が軽減され、従つてその上部油
室の作動油圧がそれだけ低下して、ブーム俯仰シリンダ
のパッキンの損傷を防止できる。At this time, in a hydraulic pump (a positive displacement pump), the discharge pressure is determined by the load, and the discharge pressure rises when the load, that is, the stay cable tension becomes excessive, but the maximum discharge pressure is limited by the relief valve. Therefore, when the boom is retracted due to the contraction of the boom elevating cylinder and the winding of the stay cable by the bobbin while the boom is tilted forward, there is no possibility that the load carried by the stay cable becomes excessive. The boom elevating cylinder contraction force is reduced according to the moment causing the boom by force (this is usually much larger than the moment arm of the boom elevating cylinder contraction force causing the boom), The operating oil pressure of the upper oil chamber is reduced accordingly, and damage to the packing of the boom elevating cylinder can be prevented.
【００２０】こうしてブームを所定位置まで引起こし
て、３位置方向切換弁を中立位置に戻すことにより、ブ
ーム俯仰シリンダの収縮を停止させると、該方向切換弁
に連動して巻胴駆動油圧モータが停止されると同時に、
ブレーキ解放シリンダの作動油圧がタンクに排出される
から、控え索の巻胴がそのブレーキ装置による一定摩擦
力で固定される。一方油圧源の吐出油圧はリリーフ弁か
らタンクに排出される。When the boom is raised to a predetermined position and the three-position directional control valve is returned to the neutral position to stop the boom elevating cylinder from contracting, the hydraulic motor for driving the winding drum is operated in conjunction with the directional control valve. At the same time as being stopped,
Since the operating oil pressure of the brake release cylinder is discharged to the tank, the bobbin of the stay cable is fixed with a constant frictional force by the brake device. On the other hand, the discharge hydraulic pressure of the hydraulic pressure source is discharged from the relief valve to the tank.
【００２１】又この状態から３位置方向切換弁をブーム
俯仰シリンダの伸長位置に切換えて、その下部油室側に
作動油圧を供給することにより、上部油室の油を、対応
するカウンタバランス弁により背圧を与えながら、タン
クに排出してブームを前倒れさせる際は、負荷によつて
ブームが前倒れ付勢されているため、該作動油圧は低
く、ブーム俯仰シリンダのパツキンが損傷する恐れはな
い。又この方向切換弁の切換えに連動して油圧源の吐出
油圧が巻胴駆動油圧モータを控え索巻取り方向に駆動付
勢するが、上述のブームの前倒れによつて控え索張力が
増そうとするため、該油圧モータは控え索の張力によつ
て逆転駆動されて巻胴から控え索を繰出し、油圧源の油
圧はリリーフ弁よりタンクに排出されて、控え索張力を
略一定に維持する。In this state, the three-position directional control valve is switched to the extension position of the boom elevating cylinder, and the operating oil pressure is supplied to the lower oil chamber side, so that the oil in the upper oil chamber is released by the corresponding counterbalance valve. When discharging to the tank and tilting the boom forward while applying back pressure, the operating hydraulic pressure is low because the boom is biased forward by the load, and the packing of the boom elevating cylinder may not be damaged. Absent. Also, in conjunction with the switching of the direction switching valve, the discharge hydraulic pressure of the hydraulic power source urges the bobbin driving hydraulic motor in the retracting line winding direction, but the retracting line tension may increase due to the above-described forward tilting of the boom. Therefore, the hydraulic motor is driven in reverse by the tension of the stay cable to extend the stay cable from the bobbin, and the hydraulic pressure of the hydraulic source is discharged from the relief valve to the tank to maintain the stay cable tension substantially constant. .
【００２２】尚ブームを、例えば図３に鎖線で示す水平
倒伏位置（ハ）と同図実線示の垂直に近い前倒れ位置
（ロ）との間で俯仰させる際は、ブームに工具その他の
吊荷負荷が作用していないため、控え索に所定張力が作
用していても、ブーム俯仰シリンダの作動油圧は比較的
低く、該ブーム俯仰シリンダのパツキンを損傷する恐れ
はない。When the boom is to be raised and lowered between, for example, a horizontal falling position (C) shown by a chain line in FIG. 3 and a vertical falling position (B) shown by a solid line in FIG. Since no load is applied, the operating oil pressure of the boom elevating cylinder is relatively low even if a predetermined tension is applied to the stay cable, and there is no danger of damaging the packing of the boom elevating cylinder.
【００２３】又ブーム俯仰シリンダの方向切換弁に連動
して巻胴駆動用油圧モータと巻胴用ブレーキ装置のブレ
ーキ解放シリンダとを制御する機構は、図示実施例に示
すパイロツト操作機構に限定されるものではなく、任意
の機構を採用し得ることは勿論である。The mechanism for controlling the hydraulic motor for driving the bobbin and the brake release cylinder of the brake for the bobbin in conjunction with the direction switching valve of the boom elevating cylinder is limited to the pilot operating mechanism shown in the illustrated embodiment. It is needless to say that any mechanism can be adopted.
【００２４】[0024]
【発明の効果】以上説明したように本発明のブーム俯仰
装置は、ブームの控え索張設側において機台とブームと
の間に連結したブーム俯仰シリンダを制御する３位置の
方向切換弁を操作するだけで、ブーム控え索の張力を略
一定に維持しながら、ブームを俯仰させることができる
のみならず、ブーム俯仰シリンダ収縮時の作動油圧上昇
によるパッキンの損傷を防止して、ブーム傾斜角の狂い
を防止することができる。As described above, the boom elevating device of the present invention operates the three-position directional control valve for controlling the boom elevating cylinder connected between the machine base and the boom on the boom staying side. Not only can the boom be lowered while maintaining the tension of the boom staying cable approximately constant, but also prevent damage to the packing due to an increase in operating oil pressure when the boom raising cylinder contracts, and reduce the boom tilt angle. Deterioration can be prevented.
【図１】本発明の一実施例の油圧回路図である。FIG. 1 is a hydraulic circuit diagram of one embodiment of the present invention.
【図２】本発明の他の実施例の油圧回路図である。FIG. 2 is a hydraulic circuit diagram of another embodiment of the present invention.
【図３】本発明を適用した大口径深穴の穴掘機の側面図
である。FIG. 3 is a side view of a large-diameter deep-hole excavator to which the present invention is applied.
２ 油圧モータ制御回路 ３ ブーム俯仰シリンダ ４ ブーム俯仰シリンダの上部油室 ５ ブーム俯仰シリンダの下部油室 ６ ブーム俯仰シリンダ制御回路の油圧源 ７ ３位置の方向切換弁 １０ 上部油室側のカウンタバランス弁 １１ 下部油室側のカウンタバランス弁 １２ 控え索の巻胴 １３ 油圧モータ １３ａ 油圧モータの油圧入口 １４ 油圧モータ制御回路の油圧源 １５ 控え索張力制限用リリーフ弁 １６ ブレーキ解放シリンダ １７ 切換弁 １８ 高圧選択弁（シヤトル弁） ２３ 切換弁 ３０ ブーム ３３ 控え索 2 Hydraulic motor control circuit 3 Boom elevating cylinder 4 Upper oil chamber of boom elevating cylinder 5 Lower oil chamber of boom elevating cylinder 6 Hydraulic power source of boom elevating cylinder control circuit 7 3 direction switching valve 10 Upper oil chamber side counter balance valve DESCRIPTION OF SYMBOLS 11 Counterbalance valve at the lower oil chamber side 12 Rewinding line winding cylinder 13 Hydraulic motor 13a Hydraulic motor inlet for hydraulic motor 14 Hydraulic motor control circuit 15 Hydraulic motor control circuit 15 Relief valve for restraining line tensioning device 16 Brake release cylinder 17 Switching valve 18 High pressure selection Valve (shuttle valve) 23 Switching valve 30 Boom 33 Stay cable
Claims (1)
ームとの間にブーム俯仰シリンダを連結した建設機械用
クレーンにおいて、ブーム俯仰シリンダを制御する３位
置の方向切換弁と、該ブーム俯仰シリンダの伸，縮作動
時にのみ、控え索の巻胴を巻取り方向に駆動すべき油圧
モータの油圧入口に、その作動油圧源と控え索張力制限
用リリーフ弁とを並列に接続するように、前記方向切換
弁に連動して制御される油圧モータ制御回路とを含み、
常時制動付勢されている巻胴用ブレーキ装置のブレーキ
解放シリンダの作動油室をタンクに接続する常時位置を
備え、該作動油室をブーム俯仰シリンダの伸，縮作動時
にのみ前記油圧源に接続するように、前記方向切換弁に
連動して切換えられる切換弁を油圧モータ制御回路に挿
入し、ブーム俯仰シリンダの伸，縮作動時には控え索が
常に緊張しているように構成したことを特徴とする建設
機械用クレーンのブーム俯仰装置。1. A construction machine crane having a boom elevating cylinder connected between a machine base and a boom on a boom staying cable laying side, a three-position directional control valve for controlling the boom elevating cylinder, and the boom elevating. Only when the cylinder is being extended or retracted, the operating hydraulic power source and the relief cable tension limiting relief valve are connected in parallel to the hydraulic inlet of the hydraulic motor that should drive the winding rope in the winding direction in the winding direction. A hydraulic motor control circuit controlled in conjunction with the direction switching valve,
The hydraulic oil chamber of the brake release cylinder of the winding cylinder brake device which is constantly biased is provided with a permanent position for connecting the hydraulic oil chamber to the tank, and the hydraulic oil chamber is connected to the hydraulic power source only when the boom elevating cylinder is extended or retracted. A switching valve that is switched in conjunction with the direction switching valve is inserted into the hydraulic motor control circuit so that the extension cable is always taut when the boom elevating cylinder is extended or retracted. Boom lifting device for construction machinery cranes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04094988A JP3074545B2 (en) | 1992-03-03 | 1992-03-03 | Crane boom raising device for construction machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04094988A JP3074545B2 (en) | 1992-03-03 | 1992-03-03 | Crane boom raising device for construction machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05246691A JPH05246691A (en) | 1993-09-24 |
| JP3074545B2 true JP3074545B2 (en) | 2000-08-07 |
Family
ID=14125270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04094988A Expired - Fee Related JP3074545B2 (en) | 1992-03-03 | 1992-03-03 | Crane boom raising device for construction machinery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3074545B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4314813C1 (en) * | 1993-05-05 | 1994-09-01 | Duesterloh Gmbh | Hydraulic circuit |
-
1992
- 1992-03-03 JP JP04094988A patent/JP3074545B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05246691A (en) | 1993-09-24 |
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