JP2001348188A - Holder for hook hanging length of crane - Google Patents

Holder for hook hanging length of crane

Info

Publication number
JP2001348188A
JP2001348188A JP2000169859A JP2000169859A JP2001348188A JP 2001348188 A JP2001348188 A JP 2001348188A JP 2000169859 A JP2000169859 A JP 2000169859A JP 2000169859 A JP2000169859 A JP 2000169859A JP 2001348188 A JP2001348188 A JP 2001348188A
Authority
JP
Japan
Prior art keywords
boom
interlocking
winch
switching valve
hydraulic motor
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.)
Granted
Application number
JP2000169859A
Other languages
Japanese (ja)
Other versions
JP4429482B2 (en
Inventor
Tomohiko Kitani
友彦 木谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Furukawa Co Ltd
Original Assignee
Furukawa Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Furukawa Co Ltd filed Critical Furukawa Co Ltd
Priority to JP2000169859A priority Critical patent/JP4429482B2/en
Publication of JP2001348188A publication Critical patent/JP2001348188A/en
Application granted granted Critical
Publication of JP4429482B2 publication Critical patent/JP4429482B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To prevent lowering of a hook rotating an oil hydraulic motor for winch to a lowering side by a residual pressure in a circuit when extending/ contracting operation of a boom is suspended. SOLUTION: In this holder for hook hanging length of a crane, provided with an interlocking switch valve switching a hydraulic cylinder for extending/ contracting a boom and an oil hydraulic motor for winch so as to be connected in series, for making the interlocking switch valve capable of switching to an interlocking side only when the boom is operated to extend/contract, as a control means for the interlocking switch valve, a boom extending/contracting operation detection circuit 42 connecting in parallel a boom extending operation detection switch LS1 and a boom contracting operation detection switch LS4 and an interlocking circuit 4 connecting in series an interlocking changeover switch 41 and a solenoid 30S of the interlocking switch valve 30 are constituted.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、伸縮作動を行うブ
ームと、フックの巻下巻上作動を行うウインチとを備え
たクレーンにおいて、ブーム伸縮用油圧シリンダとウイ
ンチ用油圧モータとを直列に接続するよう切換える連動
用切換弁を設けたクレーンのフック吊下長さ保持装置に
関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane provided with a boom for telescopic operation and a winch for lowering and hoisting a hook, in which a hydraulic cylinder for extending and retracting the boom and a hydraulic motor for the winch are connected in series. The present invention relates to a hook hanging length holding device of a crane provided with an interlocking switching valve for performing such switching.

【0002】[0002]

【従来の技術】伸縮するブームを備えたクレーンでは、
ブームの基端部を支持するコラムにウインチを設け、こ
のウインチから繰出し、繰込みされるワイヤロープをブ
ーム先端部に導いて、ブーム先端部の滑車を介してフッ
クに掛回すことにより、フックをブーム先端部から吊下
している。
2. Description of the Related Art In a crane having a telescopic boom,
A winch is provided on the column that supports the base end of the boom, and the wire rope that is fed out of the winch and guided is guided to the boom distal end, and is hooked on the hook via a pulley at the boom distal end. Hanging from the boom tip.

【0003】従って、ブーム先端部から吊下されている
フックは、ブームの伸縮に伴ってフック吊下長さ(ブー
ム先端下部とフック上端間の距離)が変化する。即ち、
ブームを伸長させると、フック吊下長さが短くなり、ブ
ームを縮小させればフック吊下長さが長くなる。クレー
ン作業中にはブームを伸縮させる必要があるが、このと
きクレーンのオペレータがフック吊下長さを一定に保持
するためには、ブームの伸長操作と同時にウインチの巻
下操作を行ない、ブームの縮小操作と同時にウインチの
巻上操作を行うことが必要となる。このような操作はオ
ペレータにとって煩雑であり、適切に行うのは極めて難
しく熟練を要する。
Accordingly, the hook hanging length (the distance between the lower end of the boom tip and the upper end of the hook) of the hook suspended from the boom tip changes as the boom expands and contracts. That is,
Extending the boom reduces the hook suspension length, and reducing the boom increases the hook suspension length. During crane operation, it is necessary to extend and retract the boom.In this case, in order to maintain a constant hook suspension length, the crane operator performs the winch lowering operation at the same time as the boom extension operation and the boom lowering operation. It is necessary to perform a winch hoisting operation simultaneously with the reducing operation. Such an operation is complicated for the operator, and it is extremely difficult to perform properly and requires skill.

【0004】そこで、操作を容易にするために、ブーム
の伸縮操作を行ったとき、フック吊下長さが一定に保た
れるように構成されたフック吊下長さ保持装置を備えた
クレーンが用いられるようになっている。このクレーン
の油圧回路は、図3に示すように構成されている。即
ち、ブーム起伏用油圧シリンダ9がブーム起伏用切換弁
15、ウインチ用油圧モータ10がウインチ用切換弁1
6、ブーム伸縮用油圧シリンダ8がブーム伸縮用切換弁
17、旋回用油圧モータ5が旋回用切換弁18、アウト
リガ用油圧シリンダ3L、3Rがアウトリガ切換弁19
L、19Rを介して、油圧ポンプ21の吐出管路22
と、タンク23への戻り管路24とに接続されている。
Therefore, in order to facilitate the operation, a crane provided with a hook suspension length holding device configured to keep the hook suspension length constant when the boom is extended and retracted. Is being used. The hydraulic circuit of this crane is configured as shown in FIG. That is, the hydraulic cylinder 9 for raising and lowering the boom is the switching valve 15 for raising and lowering the boom, and the hydraulic motor 10 for the winch is switching valve 1 for the winch.
6. The boom extending and retracting hydraulic cylinder 8 is a boom extending and retracting switching valve 17, the turning hydraulic motor 5 is a turning switching valve 18, and the outrigger hydraulic cylinders 3L and 3R are outrigger switching valves 19.
L, 19R, the discharge line 22 of the hydraulic pump 21
And a return line 24 to the tank 23.

【0005】これらの切換弁15、16、17、18、
19L、19Rは、3位置の手動操作切換弁であり、オ
ペレータが手動操作することにより、ブーム起伏用油圧
シリンダ9と、ウインチ用油圧モータ10とブーム伸縮
用油圧シリンダ8と、旋回用油圧モータ5と、左右のア
ウトリガ用油圧シリンダ3L、3Rとを作動させること
ができる。中立位置では吐出管路22を戻り管路24と
連通させる。
[0005] These switching valves 15, 16, 17, 18,
Reference numerals 19L and 19R denote three-position manual operation switching valves, which are manually operated by an operator to be operated by a hydraulic cylinder 9 for raising / lowering a boom, a hydraulic motor 10 for a winch, a hydraulic cylinder 8 for extending / retracting a boom, and a hydraulic motor 5 for turning. And the left and right outrigger hydraulic cylinders 3L, 3R can be operated. In the neutral position, the discharge line 22 is communicated with the return line 24.

【0006】吐出管路22と戻り管路24との間には、
リリーフ弁25設けられている。また、油圧ポンプ21
の吐出管路22とタンク23への戻り管路24との間に
は、リリーフ弁25と並列にアンロード弁45が設けら
れていおり、アンロード弁45のベントと戻り管路24
との間には、常閉の電磁切換弁46が設けられている。
[0006] Between the discharge line 22 and the return line 24,
A relief valve 25 is provided. Also, the hydraulic pump 21
An unload valve 45 is provided in parallel with the relief valve 25 between the discharge pipe 22 of the tank and the return pipe 24 to the tank 23.
A normally-closed electromagnetic switching valve 46 is provided between the two.

【0007】さらに、ブーム伸縮用油圧シリンダ8の縮
小側油室26とブーム伸縮用切換弁17の縮小側ポート
Bとを接続する縮小管路27の途中に、ブーム伸縮用油
圧シリンダ8の縮小側油室26とウインチ用油圧モータ
10の巻下管路28とを連通させ、ウインチ用油圧モー
タ10の巻上管路29とブーム伸縮用切換弁17の縮小
側ポートBとを連通させる連動用切換弁30と連動用管
路31、32が設けられている。
Further, in the middle of a reduction pipe 27 connecting the reduction side oil chamber 26 of the boom expansion and contraction hydraulic cylinder 8 and the reduction side port B of the boom expansion and contraction switching valve 17, the reduction side of the boom expansion and contraction hydraulic cylinder 8 is connected. An interlocking switch that allows the oil chamber 26 to communicate with the lower line 28 of the winch hydraulic motor 10, and allows the hoist line 29 of the winch hydraulic motor 10 to communicate with the reduction port B of the boom expansion / contraction switch valve 17. A valve 30 and interlocking lines 31, 32 are provided.

【0008】連動用切換弁30は、2位置の電磁切換弁
であって、この連動用切換弁30の切換操作を行うた
め、図4に示すように、連動用切換弁30のソレノイド
30sと連動用切換スイッチ41とを直列に接続した連
動用回路40が構成されており、連動用切換スイッチ4
1をonとすることにより、連動用切換弁30を連動側に
切換え、ブーム伸縮用油圧シリンダ8とウインチ用油圧
モータ10とを直列に接続することができる。
The interlocking switching valve 30 is a two-position electromagnetic switching valve. In order to perform the switching operation of the interlocking switching valve 30, as shown in FIG. 4, the interlocking switching valve 30 is interlocked with the solenoid 30s of the interlocking switching valve 30. And an interlocking switch 40 connected in series with the interlocking switch 41.
By turning 1 on, the interlocking switching valve 30 can be switched to the interlocking side, and the hydraulic cylinder 8 for extending and retracting the boom and the hydraulic motor 10 for the winch can be connected in series.

【0009】この構成により、ブームの伸縮にかかわら
ずフック吊下長さを一定に保持したい場合には、連動用
切換弁30を切換えてブーム伸縮用油圧シリンダ8とウ
インチ用油圧モータ10とを直列に接続し、ブームの伸
長とウインチの巻下げ、ブームの縮小とウインチの巻上
げを連動させることにより、フック吊下長さを一定に保
持するようになっている。
With this configuration, when it is desired to keep the hook hanging length constant irrespective of the extension / retraction of the boom, the interlocking switching valve 30 is switched to connect the hydraulic cylinder 8 for boom extension and the hydraulic motor 10 for winch in series. , And the hook suspension length is kept constant by interlocking the extension of the boom and the lowering of the winch, and the reduction of the boom and the raising of the winch.

【0010】ところで、このフック吊下長さ保持装置で
は、フック吊下長さを一定に保持するために連動用切換
スイッチ41をonとすると、連動用切換弁30は連動側
に切換えられた状態で保持されるので、この状態でブー
ム伸縮用切換弁17を中立に戻し、ブーム伸縮用油圧シ
リンダ8の作動を停止させたとき、回路内部の残留圧力
でウインチ用油圧モータ10が若干作動するという問題
がある。
In this hook hanging length holding device, when the interlocking switch 41 is turned on in order to keep the hook hanging length constant, the interlocking switching valve 30 is switched to the interlocking side. In this state, when the boom expansion / contraction switching valve 17 is returned to neutral and the operation of the boom expansion / contraction hydraulic cylinder 8 is stopped, the winch hydraulic motor 10 slightly operates due to the residual pressure inside the circuit. There's a problem.

【0011】具体的には、連動用切換弁30が連動側に
切換えられた状態でブーム伸縮用切換弁17を伸長側に
切換えると、伸長管路34から伸長側油室33に油が入
ってブーム伸縮用油圧シリンダ8が伸長し、その縮小側
油室26から出た油が連動用切換弁30、連動用管路3
1を経てウインチ用油圧モータ10の巻下管路28に入
り、ウインチが巻下作動する。この状態でブーム伸縮用
切換弁17を中立に戻し、ブーム伸縮用油圧シリンダ8
の作動を停止させると、ブーム伸縮用油圧シリンダ8
と、ウインチ用油圧モータ10の間が閉回路となり、こ
の閉回路の残留圧力により、ウインチ用油圧モータ10
が巻下側に若干回転し、フックが少し巻下がるという現
象が生じる。
Specifically, when the boom expansion / contraction switching valve 17 is switched to the extension side while the interlocking switching valve 30 is switched to the interlocking side, oil enters the extension side oil chamber 33 from the extension pipe line 34. The hydraulic cylinder 8 for extending and retracting the boom is extended, and the oil that has flowed out from the oil chamber 26 on the contraction side is connected to the interlocking switching valve 30 and the interlocking pipeline 3.
After passing through 1, it enters the lowering line 28 of the winch hydraulic motor 10, and the winch performs the lowering operation. In this state, the boom expansion / contraction switching valve 17 is returned to neutral, and the boom expansion / contraction hydraulic cylinder 8 is returned.
Is stopped, the boom extension hydraulic cylinder 8
And the winch hydraulic motor 10 form a closed circuit, and the residual pressure of the closed circuit causes the winch hydraulic motor 10
Is slightly rotated to the lower side, and a phenomenon occurs in which the hook slightly lowers.

【0012】この場合、ブーム伸縮用切換弁17を中立
に戻す前にはウインチが巻下げられているので、オペレ
ータは巻下げが少し遅れて停止する感じを受ける。連動
用切換弁30が連動側に切換えられた状態でブーム伸縮
用切換弁17を縮小側に切換えると、油が連動用切換弁
30、連動用管路32を経てウインチ用油圧モータ10
の巻上管路29に入り、ウインチ用油圧モータ10の巻
上作動が行われる。ウインチ用油圧モータ10からの戻
り油は、ウインチ用油圧モータ10の巻下管路28から
連動用管路31、連動用切換弁30を経てブーム伸縮用
油圧シリンダ8の縮小側油室26に入り、ブーム伸縮用
油圧シリンダ8を縮小させる。この状態でブーム伸縮用
切換弁17を中立に戻し、ブーム伸縮用油圧シリンダ8
の作動を停止させると、ブーム伸縮用油圧シリンダ8
と、ウインチ用油圧モータ10の間が閉回路となり、こ
の閉回路の残留圧力により、ウインチ用油圧モータ10
が巻下側に若干回転し、フックが少し巻下がるという現
象が生じる。
In this case, since the winch has been lowered before returning the boom expansion / contraction switching valve 17 to the neutral position, the operator feels that the lowering is stopped with a slight delay. When the boom extension / reduction switching valve 17 is switched to the reduction side in a state where the interlocking switching valve 30 is switched to the interlocking side, the oil flows through the interlocking switching valve 30 and the interlocking pipe line 32 to the hydraulic motor 10 for the winch.
And the winch hydraulic motor 10 is hoisted. The return oil from the winch hydraulic motor 10 enters the reduction side oil chamber 26 of the boom extendable hydraulic cylinder 8 from the lowering line 28 of the winch hydraulic motor 10 via the interlocking line 31 and the interlocking switching valve 30. Then, the hydraulic cylinder 8 for boom extension and contraction is reduced. In this state, the boom expansion / contraction switching valve 17 is returned to neutral, and the boom expansion / contraction hydraulic cylinder 8 is returned.
Is stopped, the boom extension hydraulic cylinder 8
And the winch hydraulic motor 10 form a closed circuit, and the residual pressure of the closed circuit causes the winch hydraulic motor 10
Is slightly rotated to the lower side, and a phenomenon occurs in which the hook slightly lowers.

【0013】この場合は、ブーム伸縮用切換弁17を中
立に戻す前にはウインチが巻上げられているので、巻上
げが一旦停止した後に少し巻下げが行われることにな
り、オペレータは奇異な感じを受ける。また、ブーム伸
縮用切換弁17を中立に戻し、ブーム伸縮用油圧シリン
ダ8の作動を停止させている間も連動用切換弁30のソ
レノイド30sには、引き続き通電されるので、無駄な
電力が消費される。
In this case, since the winch is wound before the boom expansion / contraction switching valve 17 is returned to the neutral position, the winding is temporarily stopped and then slightly lowered, and the operator feels strange. receive. Further, the solenoid 30s of the interlocking switching valve 30 is continuously energized while the operation of the hydraulic cylinder 8 for boom expansion and contraction is stopped by returning the boom expansion / contraction switching valve 17 to neutral, so that wasteful power is consumed. Is done.

【0014】[0014]

【発明が解決しようとする課題】本発明は、クレーンの
フック吊下長さ保持装置における上記問題を解決するも
のであって、ブーム伸縮操作時にのみ連動用切換弁が連
動側に切換えられ、ブーム伸縮操作の中止時に回路の残
留圧力によりウインチ用油圧モータが巻下側に回転して
フックが巻下がるのを防止することのできる、フック吊
下長さ保持装置を提供することを目的とする。
SUMMARY OF THE INVENTION The present invention solves the above-described problem in a crane hook hanging length holding device, and the interlocking switching valve is switched to the interlocking side only when the boom is extended and retracted, and the boom is operated. It is an object of the present invention to provide a hook suspension length holding device capable of preventing a hydraulic motor for a winch from rotating downward by a residual pressure of a circuit when a telescopic operation is stopped, thereby preventing a hook from being lowered.

【0015】[0015]

【課題を解決するための手段】本発明のクレーンのフッ
ク吊下長さ保持装置は、伸縮作動を行うブームと、フッ
クの巻下巻上作動を行うウインチとを備えたクレーンに
おいて、ブーム伸縮用油圧シリンダとウインチ用油圧モ
ータとを直列に接続するよう切換える連動用切換弁を設
けたクレーンのフック吊下長さ保持装置であって、ブー
ム伸縮操作時にのみ連動用切換弁を連動側へ切換可能と
する連動用切換弁の制御手段を設けることにより、上記
課題を解決している。
SUMMARY OF THE INVENTION According to the present invention, there is provided a hook suspension length holding device for a crane, comprising: a crane provided with a boom for extending and retracting and a winch for lowering and raising the hook. A hook hanging length holding device for a crane provided with an interlocking switching valve that switches the cylinder and winch hydraulic motor to connect in series.The interlocking switching valve can be switched to the interlocking side only during boom extension / retraction operation. The above-mentioned problem is solved by providing control means for the interlocking switching valve.

【0016】本発明のクレーンのフック吊下長さ保持装
置では、クレーン作業中にフック吊下長さを一定に保持
しながらブームを伸縮させるときには、連動用切換弁の
制御手段により連動用切換弁を連動側へ切換える。する
と、ブーム伸縮用油圧シリンダとウインチ用油圧モータ
とが直列に接続されるので、ブーム伸縮用油圧シリンダ
とウインチ用油圧モータとが連動するようになる。
In the hook hanging length holding device for a crane according to the present invention, when the boom is extended and contracted while the hook hanging length is kept constant during the crane operation, the interlocking switching valve is controlled by the interlocking switching valve control means. To the interlocking side. Then, the hydraulic cylinder for extending and retracting the boom and the hydraulic motor for the winch are connected in series, so that the hydraulic cylinder for extending and retracting the boom and the hydraulic motor for the winch are linked.

【0017】即ち、オペレータがブーム伸縮用切換弁を
伸長側へ切換えてブーム伸縮用油圧シリンダを伸長させ
ると、ブーム伸縮用油圧シリンダの縮小側油室の油は連
動用切換弁を介してウインチ用油圧モータの巻下管路に
入り、ウインチ用油圧モータの巻下作動を行わせる。ウ
インチ用油圧モータからの戻り油は、ウインチ用油圧モ
ータの巻上管路から連動用切換弁、ブーム伸縮用切換弁
の縮小側ポートを経てタンクに戻る。
That is, when the operator switches the boom extension / retraction switching valve to the extension side to extend the boom extension / retraction hydraulic cylinder, the oil in the reduction side oil chamber of the boom extension / retraction hydraulic cylinder is supplied to the winch via the interlocking switching valve. The hydraulic motor for the winch enters the lowering line of the hydraulic motor to perform the lowering operation of the hydraulic motor for the winch. The return oil from the winch hydraulic motor returns to the tank from the hoisting line of the winch hydraulic motor, via the interlocking switching valve, and the reduction side port of the boom expansion / contraction switching valve.

【0018】また、オペレータがブーム伸縮用切換弁を
縮小側へ切換えると、油圧ポンプからの圧油が連動用切
換弁を介してウインチ用油圧モータの巻上管路に入り、
ウインチ用油圧モータの巻上作動を行わせる。ウインチ
用油圧モータからの戻り油は、ウインチ用油圧モータの
巻下管路から連動用切換弁を介してブーム伸縮用油圧シ
リンダの縮小側油室に入り、ブーム伸縮用油圧シリンダ
を縮小させる。
Further, when the operator switches the boom expansion / contraction switching valve to the reduction side, the hydraulic oil from the hydraulic pump enters the hoisting hydraulic line of the winch hydraulic motor via the interlocking switching valve.
The winding operation of the winch hydraulic motor is performed. The return oil from the winch hydraulic motor enters the reduction-side oil chamber of the boom expansion / contraction hydraulic cylinder through the lowering line of the winch hydraulic motor via the interlocking switching valve, and reduces the boom expansion / contraction hydraulic cylinder.

【0019】従って、ブームが伸長すると、それに同調
してウインチのワイヤロープが繰出されて、フック吊下
長さがほぼ一定に保持され、また、ブームが縮小する
と、それに同調してウインチのワイヤロープが繰込ま
れ、フック吊下長さがほぼ一定に保持される。オペレー
タがブーム伸縮用切換弁を中立に戻して、ブーム伸縮操
作を中止すると、連動用切換弁の制御手段が連動用切換
弁を遮断側に切換えるので、ブーム伸縮用油圧シリンダ
の縮小側油室とウインチ用油圧モータとの間が閉回路と
なって油の残留圧力によりウインチ用油圧モータが巻下
側に回転してフックが巻下がるという現象は生じない。
Accordingly, when the boom is extended, the winch wire rope is paid out in synchronization with the extension of the boom, and the hook suspension length is kept substantially constant. When the boom is reduced, the winch wire rope is synchronized with the winch wire rope. And the hook suspension length is maintained substantially constant. When the operator returns the boom extension / reduction switching valve to neutral and stops the boom extension / retraction operation, the control means of the interlocking switching valve switches the interlocking switching valve to the shut-off side. There is no phenomenon that the winch hydraulic motor rotates to the lower side due to the residual pressure of the oil and the hooks lower due to the closed circuit between the winch hydraulic motor and the hydraulic circuit.

【0020】[0020]

【発明の実施の形態】図1はこの発明の実施の一形態で
あるクレーンのフック吊下長さ保持装置の油圧回路図、
図2はフック吊下長さ保持装置の電気回路図である。ク
レーンの基本的構成は、従来のものと同様であり、ブー
ムの基端部を支持するコラムにウインチを設け、このウ
インチから繰出し、繰込みされるワイヤロープをブーム
先端部に導いて、ブーム先端部の滑車を介してフックに
掛回すことにより、フックをブーム先端部から吊下して
いる。
FIG. 1 is a hydraulic circuit diagram of a hook hanging length holding device of a crane according to an embodiment of the present invention.
FIG. 2 is an electric circuit diagram of the hook hanging length holding device. The basic structure of the crane is the same as that of the conventional crane. A winch is provided on a column supporting the base end of the boom, and a wire rope which is fed out from the winch and fed in is guided to the boom tip, and the boom tip is provided. The hook is suspended from the boom tip by being hooked on the hook via the pulley of the section.

【0021】クレーンの油圧回路も従来のものと同様に
構成されている。即ち、ブーム起伏用油圧シリンダ9が
ブーム起伏用切換弁15、ウインチ用油圧モータ10が
ウインチ用切換弁16、ブーム伸縮用油圧シリンダ8が
ブーム伸縮用切換弁17、旋回用油圧モータ5が旋回用
切換弁18、アウトリガ用油圧シリンダ3L、3Rがア
ウトリガ切換弁19L、19Rを介して、油圧ポンプ2
1の吐出管路22と、タンク23への戻り管路24とに
接続されている。
The hydraulic circuit of the crane is constructed similarly to the conventional one. That is, the hydraulic cylinder 9 for raising and lowering the boom is a switching valve 15 for raising and lowering the boom, the hydraulic motor 10 for the winch is a switching valve 16 for the winch, the hydraulic cylinder 8 for extending and retracting the boom is a switching valve 17 for extending and retracting the boom, and the hydraulic motor 5 for rotating is for turning. The switching valve 18 and the outrigger hydraulic cylinders 3L and 3R are connected to the hydraulic pump 2 via the outrigger switching valves 19L and 19R.
One discharge pipe 22 and a return pipe 24 to the tank 23.

【0022】これらの切換弁15、16、17、18、
19L、19Rは、3位置の手動操作切換弁であり、オ
ペレータが手動操作することにより、ブーム起伏用油圧
シリンダ9と、ウインチ用油圧モータ10とブーム伸縮
用油圧シリンダ8と、旋回用油圧モータ5と、左右のア
ウトリガ用油圧シリンダ3L、3Rとを作動させること
ができる。中立位置では吐出管路22を戻り管路24と
連通させる。
These switching valves 15, 16, 17, 18,
Reference numerals 19L and 19R denote three-position manual operation switching valves, which are manually operated by an operator to be operated by a hydraulic cylinder 9 for raising / lowering a boom, a hydraulic motor 10 for a winch, a hydraulic cylinder 8 for extending / retracting a boom, and a hydraulic motor 5 for turning. And the left and right outrigger hydraulic cylinders 3L, 3R can be operated. In the neutral position, the discharge line 22 is communicated with the return line 24.

【0023】吐出管路22と戻り管路24との間には、
リリーフ弁25設けられている。また、油圧ポンプ21
の吐出管路22とタンク23への戻り管路24との間に
は、リリーフ弁25と並列にアンロード弁45が設けら
れていおり、アンロード弁45のベントと戻り管路24
との間には、常閉の電磁切換弁46が設けられている。
Between the discharge line 22 and the return line 24,
A relief valve 25 is provided. Also, the hydraulic pump 21
An unload valve 45 is provided in parallel with the relief valve 25 between the discharge pipe 22 of the tank and the return pipe 24 to the tank 23.
A normally-closed electromagnetic switching valve 46 is provided between the two.

【0024】さらに、ブーム伸縮用油圧シリンダ8の縮
小側油室26とブーム伸縮用切換弁17の縮小側ポート
Bとを接続する縮小管路27の途中に、ブーム伸縮用油
圧シリンダ8の縮小側油室26とウインチ用油圧モータ
10の巻下管路28とを連通させ、ウインチ用油圧モー
タ10の巻上管路29とブーム伸縮用切換弁17の縮小
側ポートBとを連通させる連動用切換弁30と連動用管
路31、32が設けられている。
Further, in the middle of the reduction pipe 27 connecting the reduction side oil chamber 26 of the boom expansion and contraction hydraulic cylinder 8 and the reduction side port B of the boom expansion and contraction switching valve 17, the reduction side of the boom expansion and contraction hydraulic cylinder 8 is connected. An interlocking switch that allows the oil chamber 26 to communicate with the lower line 28 of the winch hydraulic motor 10, and allows the hoist line 29 of the winch hydraulic motor 10 to communicate with the reduction port B of the boom expansion / contraction switch valve 17. A valve 30 and interlocking lines 31, 32 are provided.

【0025】連動用切換弁30は、2位置の電磁切換弁
であって、この連動用切換弁30の切換操作を行うため
の制御手段として、図2に示す連動用回路4が設けられ
ている。連動用回路4は、ブーム伸縮用切換弁17にブ
ームの伸長操作でonとなるブーム伸長操作検出スイッチ
LSl とブームの縮小操作でonとなるブーム縮小操作検
出スイッチLS4 とを設け、このブーム伸長操作検出ス
イッチLSl とブーム縮小操作検出スイッチLS4 とを
並列接続したブーム伸縮操作検出回路42と、連動用切
換スイッチ41と、連動用切換弁30のソレノイド30
sとを直列に接続して構成されている。
The interlocking switching valve 30 is a two-position electromagnetic switching valve, and the interlocking circuit 4 shown in FIG. 2 is provided as control means for switching the interlocking switching valve 30. . Interlocking circuit 4 is provided with a boom down operation detecting switch LS 4 to be on boom extension operation detection switch LS l and the boom of reduction operations that are on boom extension operating the boom telescoping switching valve 17, the boom a decompression operation detection switch LS l and boom down operation detecting switch LS 4 and boom telescopic operation detecting circuit 42 connected in parallel, the interlocking selector switch 41, the solenoid 30 of the interlocking switch valve 30
and s are connected in series.

【0026】連動用切換スイッチ41をon側に切換える
と、ブームの伸縮操作時にはソレノイド30sが励磁さ
れて連動用切換弁30を連動側に切換え、ブーム伸縮用
油圧シリンダ8とウインチ用油圧モータ10とを直列に
接続することができる。この構成により、ブームの伸縮
にかかわらずフック吊下長さを一定に保持したい場合に
は、連動用切換弁30を切換えてブーム伸縮用油圧シリ
ンダ8とウインチ用油圧モータ10とを直列に接続し、
ブームの伸長とウインチの巻下げ、ブームの縮小とウイ
ンチの巻上げを連動させることができる。
When the interlocking switch 41 is switched to the on side, the solenoid 30s is excited when the boom is extended and retracted, and the interlocking switching valve 30 is switched to the interlocking side, and the boom extending and retracting hydraulic cylinder 8 and the winch hydraulic motor 10 are connected. Can be connected in series. With this configuration, when it is desired to keep the hook hanging length constant irrespective of the extension / retraction of the boom, the interlocking switching valve 30 is switched to connect the hydraulic cylinder 8 for boom extension and the hydraulic motor 10 for winch in series. ,
The extension of the boom and the lowering of the winch, and the contraction of the boom and the raising of the winch can be linked.

【0027】即ち、オペレータが連動用切換スイッチ4
1をonとし、ブーム伸縮用切換弁17を伸長側へ切換え
ると、連動用切換弁30が連動側に切換わり、油圧ポン
プ21の吐出管路22から供給される圧油は、伸長管路
34からブーム伸縮用油圧シリンダ8の伸長側油室33
に入ってブーム伸縮用油圧シリンダ8を伸長させる。す
ると、ブーム伸縮用油圧シリンダ8の縮小側油室26の
油は連動用切換弁30、連動用管路31を経てウインチ
用油圧モータ10の巻下管路28に入り、ウインチ用油
圧モータ10の巻下作動を行わせる。ウインチ用油圧モ
ータ10からの戻り油は、ウインチ用油圧モータ10の
巻上管路29から連動用管路32、連動用切換弁30、
ブーム伸縮用切換弁17の縮小側ポートBから戻り管路
24を経てタンク23に戻る。
That is, the operator operates the interlocking changeover switch 4
When the switch 1 is turned on and the boom expansion / contraction switching valve 17 is switched to the extension side, the interlocking switching valve 30 is switched to the interlocking side, and the pressure oil supplied from the discharge line 22 of the hydraulic pump 21 is supplied to the extension line 34. From the extension-side oil chamber 33 of the hydraulic cylinder 8 for extending and retracting the boom
And the hydraulic cylinder 8 for extending and retracting the boom is extended. Then, the oil in the reduction-side oil chamber 26 of the hydraulic cylinder 8 for extending and retracting the boom enters the lowering line 28 of the hydraulic motor 10 for winch via the switching valve 30 for coupling and the conduit 31 for coupling, and The lowering operation is performed. Return oil from the winch hydraulic motor 10 flows from the hoisting line 29 of the winch hydraulic motor 10 to the interlocking line 32, the interlocking switching valve 30,
It returns to the tank 23 via the return line 24 from the reduction side port B of the switching valve 17 for boom expansion / contraction.

【0028】また、オペレータが連動用切換スイッチ4
1をonとし、ブーム伸縮用切換弁17を縮小側へ切換え
ると、連動用切換弁30が連動側に切換わり、油圧ポン
プ21からの圧油が連動用切換弁30、連動用管路32
を経てウインチ用油圧モータ10の巻上管路29に入
り、ウインチ用油圧モータ10の巻上作動を行わせる。
ウインチ用油圧モータ10からの戻り油は、ウインチ用
油圧モータ10の巻下管路28から連動用管路31、連
動用切換弁30を経てブーム伸縮用油圧シリンダ8の縮
小側油室26に入り、ブーム伸縮用油圧シリンダ8を縮
小させる。ブーム伸縮用油圧シリンダ8の伸長側油室3
3の油は伸長管路34、ブーム伸縮用切換弁17の伸長
側ポートAから戻り管路24を経てタンク23に戻る。
The operator operates the interlocking changeover switch 4
When 1 is turned on and the boom extension / reduction switching valve 17 is switched to the reduction side, the interlocking switching valve 30 is switched to the interlocking side, and the pressure oil from the hydraulic pump 21 is supplied to the interlocking switching valve 30 and the interlocking pipeline 32.
Through the hoist hydraulic line 10 of the winch hydraulic motor 10 to perform the hoisting operation of the winch hydraulic motor 10.
The return oil from the winch hydraulic motor 10 enters the reduction side oil chamber 26 of the boom extendable hydraulic cylinder 8 from the lowering line 28 of the winch hydraulic motor 10 via the interlocking line 31 and the interlocking switching valve 30. Then, the hydraulic cylinder 8 for boom extension and contraction is reduced. Extension-side oil chamber 3 of hydraulic cylinder 8 for boom extension
The oil No. 3 returns to the tank 23 via the return pipe 24 from the extension pipe 34 and the extension port A of the boom expansion / contraction switching valve 17.

【0029】従って、ブーム7が伸長すると、それに同
調してウインチ11のワイヤロープ12が繰出されて、
フック吊下長さがほぼ一定に保持され、また、ブーム7
が縮小すると、それに同調してウインチ11のワイヤロ
ープ12が繰込まれ、フック吊下長さがほぼ一定に保持
される。オペレータがブーム伸縮用切換弁17を中立に
戻して、ブーム伸縮操作を中止すると、ブーム伸長操作
検出スイッチLSl とブーム縮小操作検出スイッチLS
4 とが何れもoff となってソレノイド30sへの通電が
遮断され、連動用切換弁30が遮断側に切換えられるの
で、ブーム伸縮用油圧シリンダ8の縮小側油室26とウ
インチ用油圧モータ10の巻下管路28との間が閉回路
となることはなく、油の残留圧力によりウインチ用油圧
モータ10が巻下側に回転してフックが巻下がるという
現象は生じない。
Therefore, when the boom 7 is extended, the boom 7 is in the same state.
And the wire rope 12 of the winch 11 is paid out.
The hook suspension length is kept almost constant, and the boom 7
Is reduced, the wire of the winch 11 is synchronized
Loop 12 is retracted and the hook suspension length is kept almost constant
Is done. The operator neutralizes the boom expansion / contraction switching valve 17
Return and stop the boom extension operation, the boom extension operation
Detection switch LSlAnd boom reduction operation detection switch LS
FourAre turned off, and the power to the solenoid 30s is turned off.
It is shut off, and the interlocking switching valve 30 is switched to the shutoff side.
With the reduced oil chamber 26 of the hydraulic cylinder 8 for boom extension and contraction,
Closed circuit between the winding line 28 of the inch hydraulic motor 10
Hydraulic pressure for winch due to residual oil pressure
It is said that the motor 10 rotates to the lower side and the hook lowers
No phenomenon occurs.

【0030】また、ブーム伸縮用切換弁17を中立に戻
し、ブーム伸縮用油圧シリンダ8の作動を停止させてい
る間は、連動用切換弁30のソレノイド30sには通電
されないので、ソレノイド30sの保護になり、且つ省
電力化が図れる。連動用切換スイッチ41かoff の状態
では、連動用切換弁30は連動側には切換わらず、ブー
ム伸縮用油圧シリンダ8とウインチ用油圧モータ10と
は、独立して作動する。
While the boom extension / reduction switching valve 17 is returned to the neutral position and the operation of the boom extension / retraction hydraulic cylinder 8 is stopped, the solenoid 30s of the interlocking switching valve 30 is not energized, so that the solenoid 30s is protected. And power saving can be achieved. When the interlocking switch 41 is off, the interlocking switching valve 30 does not switch to the interlocking side, and the boom extension hydraulic cylinder 8 and the winch hydraulic motor 10 operate independently.

【0031】[0031]

【発明の効果】以上説明したように、この発明のクレー
ンフック吊下長さ保持装置では、ブーム伸縮操作時にの
み連動用切換弁が連動側に切換えられ、ブーム伸縮操作
の中止時に回路の残留圧力によりウインチ用油圧モータ
が巻下側に回転してフックが巻下がるのを防止すること
ができる。
As described above, in the crane hook suspension length holding device of the present invention, the interlocking switching valve is switched to the interlocking side only during the boom extension / retraction operation, and the residual pressure of the circuit is stopped when the boom extension / retraction operation is stopped. Accordingly, it is possible to prevent the winch hydraulic motor from rotating to the lower side and the hook from lowering.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施の一形態であるクレーンのフック
吊下長さ保持装置の油圧回路図である。
FIG. 1 is a hydraulic circuit diagram of a hook hanging length holding device of a crane according to an embodiment of the present invention.

【図2】クレーンのフック吊下長さ保持装置の電気回路
図である。
FIG. 2 is an electric circuit diagram of a hook hanging length holding device of the crane.

【図3】従来のクレーンのフック吊下長さ保持装置の油
圧回路図である。
FIG. 3 is a hydraulic circuit diagram of a conventional hook hanging length holding device of a crane.

【図4】従来のクレーンのフック吊下長さ保持装置の電
気回路図である。
FIG. 4 is an electric circuit diagram of a conventional hook hanging length holding device of a crane.

【符号の説明】[Explanation of symbols]

4 連動用回路 8 ブーム伸縮用油圧シリンダ 10 ウインチ用油圧モータ 16 ウインチ用切換弁 17 ブーム伸縮用切換弁 21 油圧ポンプ 22 吐出管路 23 タンク 24 戻り管路 26 縮小側油室 27 縮小管路 28 巻下管路 29 巻上管路 30 連動用切換弁 30s ソレノイド 31 連動用管路 32 連動用管路 33 伸長側油室 34 伸長管路 41 連動用切換スイッチ 42 ブーム伸縮操作検出回路 LSl ブーム伸長操作検出スイッチ LS4 ブーム縮小操作検出スイッチ4 Interlocking Circuit 8 Hydraulic Cylinder for Boom Extension / Retraction 10 Hydraulic Motor for Winch 16 Switching Valve for Winch 17 Boom Extension Switching Valve 21 Hydraulic Pump 22 Discharge Pipeline 23 Tank 24 Return Pipeline 26 Reduction-side Oil Chamber 27 Reduction Pipeline 28 Windings Lower line 29 Hoisting line 30 Interlocking switching valve 30s Solenoid 31 Interlocking line 32 Interlocking line 33 Extension oil chamber 34 Extension line 41 Interlocking changeover switch 42 Boom extension / retraction operation detection circuit LS l Boom extension operation Detection switch LS 4 Boom reduction operation detection switch

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 伸縮作動を行うブームと、フックの巻下
巻上作動を行うウインチとを備えたクレーンにおいて、
ブーム伸縮用油圧シリンダとウインチ用油圧モータとを
直列に接続するよう切換える連動用切換弁を設けたクレ
ーンのフック吊下長さ保持装置であって、 ブーム伸縮操作時にのみ連動用切換弁を連動側へ切換可
能とする連動用切換弁の制御手段を設けたことを特徴と
するクレーンのフック吊下長さ保持装置。
1. A crane provided with a boom for performing a telescopic operation and a winch for performing a lower hoisting operation of a hook,
A hook hanging length holding device for a crane provided with an interlocking switching valve for switching a hydraulic cylinder for winch extension and a hydraulic motor for winch to be connected in series, wherein the interlocking switching valve is operated only when the boom is extended or retracted. A hook hanging length holding device for a crane, characterized in that control means for an interlocking switching valve for switching to a hook is provided.
JP2000169859A 2000-06-07 2000-06-07 Crane hook suspension length holding device Expired - Fee Related JP4429482B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000169859A JP4429482B2 (en) 2000-06-07 2000-06-07 Crane hook suspension length holding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000169859A JP4429482B2 (en) 2000-06-07 2000-06-07 Crane hook suspension length holding device

Publications (2)

Publication Number Publication Date
JP2001348188A true JP2001348188A (en) 2001-12-18
JP4429482B2 JP4429482B2 (en) 2010-03-10

Family

ID=18672654

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000169859A Expired - Fee Related JP4429482B2 (en) 2000-06-07 2000-06-07 Crane hook suspension length holding device

Country Status (1)

Country Link
JP (1) JP4429482B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102180416A (en) * 2011-01-26 2011-09-14 徐州赫思曼电子有限公司 Electronic hyperextension-proof device of single cylinder bolt type telescopic boom crane oil cylinder
CN105346558A (en) * 2015-10-19 2016-02-24 杭州创联电子技术有限公司 Rail collection vehicle beam over-limit alarming system and control method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102180416A (en) * 2011-01-26 2011-09-14 徐州赫思曼电子有限公司 Electronic hyperextension-proof device of single cylinder bolt type telescopic boom crane oil cylinder
CN102180416B (en) * 2011-01-26 2013-04-24 徐州赫思曼电子有限公司 Electronic hyperextension-proof device of single cylinder bolt type telescopic boom crane oil cylinder
CN105346558A (en) * 2015-10-19 2016-02-24 杭州创联电子技术有限公司 Rail collection vehicle beam over-limit alarming system and control method

Also Published As

Publication number Publication date
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