JP2636323B2 - Turning speed control device for construction tower crane - Google Patents

Turning speed control device for construction tower crane

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Publication number
JP2636323B2
JP2636323B2 JP10560388A JP10560388A JP2636323B2 JP 2636323 B2 JP2636323 B2 JP 2636323B2 JP 10560388 A JP10560388 A JP 10560388A JP 10560388 A JP10560388 A JP 10560388A JP 2636323 B2 JP2636323 B2 JP 2636323B2
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JP
Japan
Prior art keywords
load
turning
jib
tower crane
proportional valve
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
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JP10560388A
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Japanese (ja)
Other versions
JPH0289799A (en
Inventor
淳雄 越原
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Individual
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Individual
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Priority to JP10560388A priority Critical patent/JP2636323B2/en
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Publication of JP2636323B2 publication Critical patent/JP2636323B2/en
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Expired - Fee Related legal-status Critical Current

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Description

【発明の詳細な説明】 産業上の利用分野: 本発明は建設用タワークレーンの旋回速度を、吊荷重
に応じて安定状態で作動することができるよう制御する
装置に関するものである。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling the turning speed of a construction tower crane so that it can operate in a stable state in accordance with a suspended load.

発明の背景: 主として建設現場で使用される据付け型のクレーン、
特にタワークレーンにあつては、その作業半径が他の移
動式クレーンなどに比べて大きく、また吊り荷重も比較
的広い幅で取り扱われている。
BACKGROUND OF THE INVENTION Stationary cranes, mainly used on construction sites
In particular, tower cranes have a larger working radius than other mobile cranes and the like, and the hanging load is handled with a relatively wide width.

しかるに、クレーンの旋回駆動部の旋回力はほぼ一定
になつているから、製作時には最も過酷な条件に設定し
て、旋回駆動部が構成されている。したがつて、その許
容範囲内での運転については、当然支障なく操作でき
る。しかし作業半径が大きいと、吊り荷重により異なる
が、旋回移動して所要位置で停止する際、旋回慣性が作
用してブームに変則的な負荷が作用すると共に、旋回駆
動部にも大きな外力が急激に働く。
However, since the turning force of the turning drive unit of the crane is almost constant, the turning drive unit is configured under the most severe conditions during manufacture. Therefore, operation within the allowable range can be operated without any problem. However, if the working radius is large, it depends on the lifting load, but when turning and stopping at the required position, the turning inertia acts and an irregular load acts on the boom, and a large external force also suddenly applies to the turning drive. Work on.

もつとも、タワーの頂部に運転用のキヤビンを備えた
大型のクレーンにあつては、運転者が高位置で作業状況
を把握しながら運転することになるので、速度制御もで
きるから旋回移動時の慣性も緩和できる。したがつて、
本発明において対象とするようなクレーンに運転用キヤ
ビンが備わつておらず、据付け位置の近傍で運転者が遠
隔操作して運転するような方式のクレーンとは比較にな
らない。
In the case of a large crane with a driving cabin at the top of the tower, the driver must operate at a high position while grasping the work situation, so speed control is also possible, so inertia during turning movement is possible. Can also be reduced. Therefore,
The crane as the object of the present invention is not provided with an operating cabin, and is incomparable with a crane of a type in which a driver remotely operates near an installation position to operate.

解決しようとする課題: このように、従来使用されている遠隔操作型のタワー
クレーンにあつては、作業時の旋回半径が大きいと、旋
回操作時に発生する慣性力を、制御することが非常に困
難であり、そのためにジブ全体の剛性や旋回駆動部に関
する構造の強化等、いわば過剰な構造強化が要求されて
いる。
Problems to be solved: As described above, in the conventional remote-controlled tower crane, when the turning radius at the time of work is large, it is very difficult to control the inertial force generated at the time of turning operation. Therefore, it is necessary to reinforce the structure of the jib as a whole and the structure of the swivel drive unit, so to speak, excessive structural reinforcement.

課題を解決するための手段: 本発明は上記したような運転上発生する問題点を解決
して、遠隔操作方式のタワークレーンにおいても、吊り
荷重によつて旋回速度を変え、常に旋回時の慣性が一定
状態に収まるようにした旋回速度を吊荷重に応じて制御
する機構を付設し、安全運転ができるクレーンの制御装
置を提供することにある。
Means for Solving the Problems: The present invention solves the above-mentioned problems that occur during operation, and even in a remotely operated tower crane, the turning speed is changed by the hanging load, and the inertia during turning is always constant. Another object of the present invention is to provide a control device for a crane, which is provided with a mechanism for controlling the turning speed so that the rotation speed can be kept in a constant state in accordance with the suspended load, so that safe operation is possible.

すなわち、本発明による建設用タワークレーンの旋回
速度制御装置は、建設用タワークレーンにおいて、ジブ
もしくはその近傍に、多段階に吊荷重を検出できるよう
にした吊荷重検出器が吊索と連結して配設され、この吊
荷重検出器は、多段階に設定された各設定荷重検出部で
の検出信号が増幅器を介して旋回駆動用油圧モータの駆
動油圧管路中に設けた電磁比例弁の操作ソレノイドに伝
達されるようにした電気制御機構と接続され、この電気
制御機構は、前記吊荷重検出器により検出される吊荷重
が大きくなるにしたがって前記旋回駆動用油圧モータの
駆動油圧を絞るように制御するとともに、この吊荷重が
最大許容吊荷重を越えるときに前記電磁比例弁を閉動作
するように制御することを特徴とする。
That is, the turning speed control device for a construction tower crane according to the present invention is such that, in the construction tower crane, a suspension load detector capable of detecting a suspension load in multiple stages is connected to a suspension cable in the jib or in the vicinity thereof. This hanging load detector is provided with a detection signal from each of the set load detection units set in multiple stages, and an operation of an electromagnetic proportional valve provided in a drive hydraulic line of a turning drive hydraulic motor via an amplifier. The electric control mechanism is connected to an electric control mechanism that is transmitted to the solenoid, and the electric control mechanism reduces the drive oil pressure of the turning drive hydraulic motor as the suspension load detected by the suspension load detector increases. In addition to the control, when the suspended load exceeds the maximum allowable suspended load, the electromagnetic proportional valve is controlled to be closed.

本発明のクレーンジブ旋回速度制御装置は、ジブが起
伏する型式であつても、或いは水平型のものであつても
採用できる。もちろん、ジブが伸縮する場合でも同様で
ある。
The crane jib turning speed control device of the present invention may be of a type in which the jib undulates or of a horizontal type. Of course, the same applies to the case where the jib expands and contracts.

特に、ジブが起伏する型式の場合、吊荷重とジブ長
さ、ジブ角度をそれぞれ検出する検出器を、ジブもしく
はその支持近傍に配設し、各検出器による検出信号をコ
ンピユータで演算して、油圧源から旋回駆動用油圧モー
タへの駆動回路中にある電磁比例弁の操作ソレノイドに
指令信号を伝達する制御機構を、油圧制御部に組込んだ
構成とすることができる。
In particular, in the case of the type in which the jib is undulated, the detectors for detecting the hanging load, the jib length, and the jib angle are arranged near the jib or its support, and a detection signal from each detector is calculated by a computer. A control mechanism for transmitting a command signal to an operating solenoid of an electromagnetic proportional valve in a drive circuit from a hydraulic source to a turning drive hydraulic motor may be incorporated in a hydraulic control unit.

さらに、ジブ起伏式のクレーンでの、ジブ起伏角度で
検出すること、またはジブ長さ(水平ジブでのトロリー
位置)を検出すると、などで旋回制御することもでき
る。
Further, when a jib hoisting type crane detects a jib hoisting angle, or when a jib length (a trolley position on a horizontal jib) is detected, turning control can be performed.

作用: 本発明によれば、資材等の揚降作業時、ブーム先端に
作用する吊荷重が、吊索の先端と連結された吊荷重検出
器において、多段階に設定してある検出吊荷重の各段階
区分内で、その検出荷重に対応した指令信号を発する
と、これが油圧制御機構に伝達されて、増幅器およびコ
ントローラからなる制御部によつて信号変換され、電磁
比例弁のソレノイドが入力される電流値に対応して該比
例弁が操作される。すると、旋回駆動用モータへの作動
油の供給量が規制され、その旋回駆動速度は定常状態か
ら、吊荷重が大きくなる程に低速に移行する。また、吊
荷重が予め設定されている最大許容吊荷重を越えると、
電磁比例弁が閉動作されて旋回操作が行われなくなる。
したがつて、ジブの旋回時に、吊荷重による旋回慣性が
高まることなく、安定した状態で旋回させることができ
る。
Action: According to the present invention, during lifting operation of a material or the like, the suspended load acting on the end of the boom is detected by the suspended load detector connected to the distal end of the suspended cable, and the detected suspended load is set in multiple stages. When a command signal corresponding to the detected load is issued in each stage section, the command signal is transmitted to a hydraulic control mechanism, converted into a signal by a control unit including an amplifier and a controller, and the solenoid of the electromagnetic proportional valve is input. The proportional valve is operated according to the current value. Then, the supply amount of hydraulic oil to the turning drive motor is regulated, and the turning drive speed shifts from a steady state to a lower speed as the lifting load increases. Also, if the lifting load exceeds the preset maximum allowable lifting load,
The electromagnetic proportional valve is closed and the turning operation is not performed.
Therefore, when the jib is turned, the jib can be turned in a stable state without increasing the turning inertia due to the suspended load.

その結果、旋回駆動のみならずジブに対する横方向の
たわみやマスト(ポスト)に対するねじれ作用力が緩和
され、耐久性が向上する。
As a result, not only the turning drive but also the bending in the lateral direction with respect to the jib and the twisting force with respect to the mast (post) are reduced, and the durability is improved.

実施例: 次に本発明を一実施例について図面により説明すれ
ば、次の通りである。
Embodiment: Next, an embodiment of the present invention will be described with reference to the drawings.

第1図に示すのはジブ起伏式の建設用タワークレーン
であり、クライミング機構(5)と旋回駆動部とは旋回
盤(2)上に搭載した油圧ユニツトにより駆動されるよ
うになつている。旋回盤(2)上に搭載された巻上げ機
(6)から繰出される吊索(7)は、ジブ支持フレーム
(3)頂部の滑車からジブ(4)先端の滑車を巡つて吊
滑車ブロツク(7′)を昇降自在に吊り下げ、再びジブ
支持フレーム(3)の頂部滑車を経て垂下させた先端
を、一端が旋回盤(2)側に取り付く吊荷重検出器(1
0)に接続して運転できるようにしてある。(1)はマ
スト、(8)はジブ起伏用ウインチ、(8′)は起伏索
である。
FIG. 1 shows a tower crane for construction of a jib type, in which a climbing mechanism (5) and a swing drive unit are driven by a hydraulic unit mounted on a swivel (2). A hoisting line (7) fed from a hoisting machine (6) mounted on a swivel (2) extends from a pulley at the top of the jib support frame (3) to a pulley at the end of the jib (4) to form a pulley block ( 7 ') is lifted up and down freely, and the tip of the jib support frame (3), which is suspended again through the top pulley, is attached to a swing load detector (1) at one end.
0) to allow operation. (1) is a mast, (8) is a jib hoisting winch, and (8 ') is an hoisting line.

吊荷重検出器(10)としては、多接点を有して、内在
させた接点操作片が組込んだばね力に抗して作用する吊
索(7)の引張力で直線移動して、設定荷重に対応した
条件のもとで所定の接点が操作され、吊荷重がどの設定
値にあるかを外部に電気信号でもつて発する、いわゆる
アナログタイプの検出器である。この接点操作片に連結
するロツドの外端部には、吊索(7)端を接続して、荷
重を直接伝達するようにしてある。
The hanging load detector (10) has multiple contacts, and the contact operating piece included therein is linearly moved by the pulling force of the hanging rope (7) acting against the built-in spring force and set. This is a so-called analog type detector in which predetermined contact points are operated under conditions corresponding to the load, and the set value of the suspended load is externally transmitted by an electric signal. An end of a hanging cable (7) is connected to an outer end of a rod connected to the contact operation piece so that a load is directly transmitted.

油圧制御機構(20)では、第2図に例示するように、
油圧ユニツト(21)の油圧ポンプ(22)から、旋回盤
(2)上の旋回駆動用油圧モータ(23)(以下旋回モー
タと言う)までの給油路中に電磁比例弁(24)を介在さ
せ、該電磁比例弁(24)によつて旋回モータ(23)の回
転速度を制御するようになつている。なお、油圧制御機
構(20)において、本発明に直接関係しない機器につい
ては省略してある。図中符号(25)はリリーフ弁、(2
6)は逆止弁、(27)はカツプラーである。
In the hydraulic control mechanism (20), as illustrated in FIG.
An electromagnetic proportional valve (24) is interposed in the oil supply path from the hydraulic pump (22) of the hydraulic unit (21) to the turning drive hydraulic motor (23) (hereinafter referred to as the turning motor) on the turning table (2). The rotational speed of the swing motor (23) is controlled by the electromagnetic proportional valve (24). In the hydraulic control mechanism (20), devices not directly related to the present invention are omitted. Symbol (25) in the figure is a relief valve, (2
6) is a check valve, and (27) is a cutler.

油圧制御機構(20)中の電磁比例弁(24)と、前記吊
荷重検出器(10)とは、第3図に例示するような電気制
御機構によつて、吊荷重検出器(10)が検知した信号
で、電磁比例弁(24)が制御操作されるように関連させ
てある。この電気制御回路中ブロツク(11)は、吊荷重
検出器(10)における荷重検知接点が3段階に設けたも
のを示す(これ以上の多接点にすることも任意であ
る)。その接点(LS1)は吊荷重900kgで作動する。接点
(LS2)は吊荷重1200kgで作動する。接点(LS3)は吊荷
重1500kgで作動する。これらはいずれも任意の荷重に設
定できるので、これら数値に限定されるものではない。
The electromagnetic proportional valve (24) in the hydraulic control mechanism (20) and the suspended load detector (10) are connected to the suspended load detector (10) by an electric control mechanism as illustrated in FIG. The detected signal is related so that the electromagnetic proportional valve (24) is controlled and operated. The block (11) in the electric control circuit indicates that the load detecting contacts in the hanging load detector (10) are provided in three stages (more than this number of contacts are optional). The contact (LS 1 ) operates with a hanging load of 900 kg. The contacts (LS 2 ) operate with a hanging load of 1200 kg. The contacts (LS 3 ) operate with a hanging load of 1500 kg. Each of these can be set to any load, and is not limited to these numerical values.

これら各接点と接続されたリレー(LR1)、(LR2)、
(LR3)によつて、補助リレー(L1)(L2)(L3)が作
動するようにし、これら補助リレーを介してアンプ(A
m)に信号が伝達されるようにし、このアンプ(Am)に
よつて出力される電気信号でもつて、電磁比例弁(24)
の直流ソレノイドに対する電流値を変化させ、可動鉄心
の移動量を制御することで、油圧ポンプ(22)から旋回
モータ(23)への作動油供給量を比例制御し、旋回モー
タ(23)の回転速度を変えるようにしてある。図中符号
(Lr1)(Lr2)(Lr3)は、それぞれリレー(LR1)(LR
2)(LR3)の各A接点。(L1′)(L2′)は補助リレー
(L1)(L2)の各B接点。(L1″)(L2″)(L3″)は
補助リレー(L1)(L2)(L3)の各A接点。(MS)は油
圧ポンプ駆動回路のマグネツトスイツチ操作リレー、
(MS′)はその接点。(PB1)(PB2)は押釦スイツチで
ある。
Each of these contacts with the connected relay (LR 1), (LR 2 ),
(LR 3 ), the auxiliary relays (L 1 ), (L 2 ) and (L 3 ) are activated, and the amplifier (A
m), and the electric signal output by the amplifier (Am) is also used for the electromagnetic proportional valve (24).
The amount of hydraulic oil supplied from the hydraulic pump (22) to the swing motor (23) is proportionally controlled by changing the current value to the DC solenoid of I change the speed. Symbols (Lr 1 ) (Lr 2 ) (Lr 3 ) in the figure are relays (LR 1 ) (LR
2 ) Each A contact of (LR 3 ). (L 1 ′) and (L 2 ′) are the B contacts of the auxiliary relays (L 1 ) and (L 2 ). (L 1 ″) (L 2 ″) (L 3 ″) are A contacts of auxiliary relays (L 1 ) (L 2 ) (L 3 ). (MS) is a magnet switch for hydraulic pump drive circuit,
(MS ') is the contact. (PB 1 ) and (PB 2 ) are push-button switches.

このような構成からなる制御装置を備えたクレーンで
は、定常の運転については従来のものと同様に操作して
作動する。作業に際し、吊荷重が小さい場合には吊滑車
ブロツク(7′)を介して吊索(7)に作用する荷重も
小さいので、吊荷重検出器(10)は定常状態にある。し
たがつて旋回速度も最大速度で作動する。
In the crane provided with the control device having such a configuration, the steady operation is operated and operated in the same manner as the conventional one. At the time of the work, when the hanging load is small, the load acting on the hanging cable (7) via the hanging pulley block (7 ') is small, so that the hanging load detector (10) is in a steady state. Therefore, the turning speed also operates at the maximum speed.

吊荷重がたとえば900kgを越えた状態であると、吊索
(7)を介して吊荷重検出器(10)が操作され、閉接点
(LS1)を開くので、リレー(LR1)の励磁が停止して、
その接点(Lr1)が開き、補助リレー(L1)の作動を停
止させるので、その接点(L1″)が開いてアンプ(Am)
での高速作動信号が断たれる。この際補助リレー(L1
のB接点(L1′)が復帰するから、補助リレー(L2)に
切換えられ、その作動でアンプ(Am)への信号回路の接
点(L2″)が閉じ、中速で作動する指令が与えられる。
したがつて該アンプ(Am)の出力信号は中速に切換えら
れて、電磁比例弁(24)のソレノイドに対しての電流値
が制御され、旋回モータ(23)への作動油供給量が絞ら
れることになり、当然この状態の旋回速度は減じる。
If it is a state where hanging load for example exceeds 900 kg, the load detector suspended through the slings (7) (10) is operated, since opening the closed contact (LS 1), the excitation of the relay (LR 1) Stop,
Since the contact (Lr 1 ) opens and stops the operation of the auxiliary relay (L 1 ), the contact (L 1 ″) opens and the amplifier (Am)
High-speed operation signal is cut off. At this time, the auxiliary relay (L 1 )
B contact (L 1 ′) returns, and it is switched to the auxiliary relay (L 2 ), which closes the contact (L 2 ″) of the signal circuit to the amplifier (Am) and activates at medium speed Is given.
Accordingly, the output signal of the amplifier (Am) is switched to medium speed, the current value to the solenoid of the solenoid proportional valve (24) is controlled, and the supply amount of hydraulic oil to the swing motor (23) is reduced. As a result, the turning speed in this state naturally decreases.

吊荷重が1200kgを越えた状態であると、吊荷重検出器
(10)の作動で閉接点(LS1)と共に接点(LS2)も開く
ので、リレー(LR1)(LR2)が作動を停止し、両リレー
の接点(Lr1)(Lr2)が開き、補助リレー(L1)と共に
リレー(L2)も作動停止し、その指令信号でアンプ(A
m)への信号回路の接点(L1″)(L2″)が開いて、ア
ンプ(Am)は高速、中速作動信号が断たれる。この際補
助リレー(L1)(L2)のB接点(L1′)に加えて接点
(L2′)が復帰するから、補助リレー(L3)に切換えら
れ、その作動で信号回路の接点(L3″)が閉じ、低速で
作動する指令が与えられる。したがつて該アンプ(Am)
の出力信号は低速に切換えられて、電磁比例弁(24)が
絞られる方向にソレノイドを制御し、旋回モータ(23)
への作動油供給量が絞られ、旋回速度は更に減じる。
If the suspended load exceeds 1200 kg, the contact (LS 2 ) is opened together with the closed contact (LS 1 ) by the operation of the suspended load detector (10), and the relays (LR 1 ) and (LR 2 ) are activated. Stops, the contacts (Lr 1 ) and (Lr 2 ) of both relays open, the relay (L 2 ) stops operating along with the auxiliary relay (L 1 ), and the amplifier (A
The contact (L 1 ″) (L 2 ″) of the signal circuit to m) opens, and the amplifier (Am) cuts off the high-speed and medium-speed operation signals. Since this time the auxiliary relay (L 1) 'contacts in addition to the (L 2 (L 2) of the B contact (L 1)') is returned, is switched to the auxiliary relay (L 3), of the signal circuit in its operation The contact (L 3 ″) is closed and a command to operate at low speed is given.
The output signal is switched to low speed, and the solenoid is controlled in the direction in which the electromagnetic proportional valve (24) is throttled, and the swing motor (23)
The amount of hydraulic oil supplied to the engine is reduced, and the turning speed is further reduced.

吊荷重が1500kgを越えると(この実施例では最大許容
吊荷重1500kgとして説明)、吊荷重検出器(10)の検知
によつて閉接点(LS3)も開くので、リレー(LR3)の作
動が停止し、補助リレー(L3)への回路中の接点(L
r3)が開き、その結果アンプ(Am)への指令信号は断た
れるので、電磁比例弁(24)は閉動作して、吊荷重がオ
ーバーしたことを指示し、旋回操作が行われなくなる。
したがつて吊荷重を1500kg以下にすれば、吊荷重検出器
(24)の検知によつて低速で作動信号がアンプに与えら
れて、旋回可能となる。
When the lifting load exceeds 1500 kg (in this example, the maximum allowable lifting load is 1500 kg), the closed contact (LS 3 ) is opened by the detection of the lifting load detector (10), and the relay (LR 3 ) is activated. Stops and contacts (L 3 ) in the circuit to the auxiliary relay (L 3 )
r 3 ) is opened, and as a result, the command signal to the amplifier (Am) is cut off, and the solenoid proportional valve (24) closes, indicating that the suspended load has exceeded, and the turning operation is not performed. .
Accordingly, if the suspension load is set to 1500 kg or less, an operation signal is given to the amplifier at a low speed by detection of the suspension load detector (24), and the vehicle can be turned.

以上は3段階に規制する態様を示したが、吊荷重検出
器における検出接点を3以上にすると共にそれらに接が
る電気制御系も対応させれば、旋回速度を更に細分した
段階で制御することができる。
In the above, the mode of regulating in three stages has been described. However, if the number of detection contacts in the hanging load detector is three or more and an electric control system in contact with them is also supported, the turning speed is controlled in a further subdivided stage. be able to.

別な手段として、ジブ(4)の基部近傍に起伏角度を
検出する計測器を取り付けておき、吊索(7)端は前記
実施例と同様に吊荷重検出器の操作ロツド端に接続し、
前記の電気制御機構において、ジブの起伏角度による制
限を設定する回路を付加することで、角度による規制も
加えて旋回速度を制御できる。
As another means, a measuring device for detecting the undulation angle is attached near the base of the jib (4), and the end of the hanging cable (7) is connected to the operating rod end of the hanging load detector in the same manner as in the previous embodiment.
In the above-described electric control mechanism, by adding a circuit for setting a limit based on the jib undulation angle, the turning speed can be controlled in addition to the restriction based on the angle.

発明の効果: 本発明によれば、クレーンにより資材等の揚降作業に
伴なうジブの旋回操作時、その吊荷重に応じて旋回速度
を加減できるようにしたので、その旋回慣性が予め決め
た範囲内になるよう制御できる。また、吊荷重が予め設
定されている最大許容吊荷重を越えると、旋回操作を禁
止するように制御できる。したがつて、旋回駆動部に対
する外力やジブに対する過剰な横荷重が作用するのを防
止でき、円滑にして安全でしかも経済的な運転ができる
クレーンが得られる。
Advantageous Effects of the Invention: According to the present invention, at the time of turning operation of a jib accompanying lifting and lowering of materials and the like by a crane, the turning speed can be adjusted according to the suspended load, so that the turning inertia is predetermined. Can be controlled within the range. Further, when the suspension load exceeds a preset maximum allowable suspension load, the turning operation can be controlled to be prohibited. Accordingly, it is possible to prevent the external force applied to the turning drive unit and the excessive lateral load applied to the jib from being applied, and to obtain a crane which can be operated smoothly, safely and economically.

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

第1図は本発明装置が組込まれた建設用クレーンの一例
を示す図、第2図は旋回駆動用の油圧制御系を示す図、
第3図は電気制御機構を示す回路図である。 (2)……クレーンの旋回盤、(3)……ジブ支持フレ
ーム (4)……ジブ、(6)……巻上げ機 (7)……吊索、(7′)……吊滑車ブロツク (8)……ジブ起伏用ウインチ、(8′)……起伏索 (10)……吊荷重検出器、(20)……油圧制御機構 (22)……油圧ポンプ、(23)……旋回モータ (24)……電磁比例弁 (LS1)(LS2)(LS3)……吊荷重検出器の接点 (LR1)(LR2)(LR3)……リレー (L1)(L2)(L3)……補助リレー (Lr1)(Lr2)(Lr3)……吊荷重検出リレーのA接点 (L1′)(L2′)……補助リレーのB接点 (L1″)(L2″)(L3″)……補助リレーのA接点 (Am)……増幅器
FIG. 1 is a diagram showing an example of a construction crane in which the device of the present invention is incorporated, FIG. 2 is a diagram showing a hydraulic control system for turning drive,
FIG. 3 is a circuit diagram showing an electric control mechanism. (2)… swivel of crane, (3)… jib support frame (4)… jib, (6)… hoisting machine (7)… hanging rope, (7 ′)… hanging pulley block ( 8) Winch for jib hoisting, (8 ') Hoisting rope (10) Hanging load detector, (20) Hydraulic control mechanism (22) Hydraulic pump, (23) Swing motor (24) .... proportional solenoid valve (LS 1) (LS 2) (LS 3) ...... hanging load detector contacts (LR 1) (LR 2) (LR 3) ...... relay (L 1) (L 2 ) (L 3 ) Auxiliary relay (Lr 1 ) (Lr 2 ) (Lr 3 ) A contact of hanging load detection relay (L 1 ′) (L 2 ′)… A contact of auxiliary relay (L 1 ″) (L 2 ″) (L 3 ″) Auxiliary relay A contact (Am) Amplifier

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】建設用タワークレーンにおいて、ジブもし
くはその近傍に、多段階に吊荷重を検出できるようにし
た吊荷重検出器が吊索と連結して配設され、この吊荷重
検出器は、多段階に設定された各設定荷重検出部での検
出信号が増幅器を介して旋回駆動用油圧モータの駆動油
圧管路中に設けた電磁比例弁の操作ソレノイドに伝達さ
れるようにした電気制御機構と接続され、この電気制御
機構は、前記吊荷重検出器により検出される吊荷重が大
きくなるにしたがって前記旋回駆動用油圧モータの駆動
油圧を絞るように制御するとともに、この吊荷重が最大
許容吊荷重を越えるときに前記電磁比例弁を閉動作する
ように制御することを特徴とする建設用タワークレーン
の旋回速度制御装置。
In a construction tower crane, a suspension load detector capable of detecting a suspension load in multiple stages is provided in connection with a suspension cable at or near a jib, and the suspension load detector comprises: An electric control mechanism in which a detection signal at each set load detection unit set in multiple stages is transmitted via an amplifier to an operation solenoid of an electromagnetic proportional valve provided in a drive hydraulic line of a turning drive hydraulic motor. The electric control mechanism controls the drive hydraulic pressure of the turning drive hydraulic motor to be reduced as the lifting load detected by the lifting load detector increases. A turning speed control device for a construction tower crane, wherein the control is performed so as to close the electromagnetic proportional valve when a load is exceeded.
JP10560388A 1988-04-28 1988-04-28 Turning speed control device for construction tower crane Expired - Fee Related JP2636323B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10560388A JP2636323B2 (en) 1988-04-28 1988-04-28 Turning speed control device for construction tower crane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10560388A JP2636323B2 (en) 1988-04-28 1988-04-28 Turning speed control device for construction tower crane

Publications (2)

Publication Number Publication Date
JPH0289799A JPH0289799A (en) 1990-03-29
JP2636323B2 true JP2636323B2 (en) 1997-07-30

Family

ID=14412078

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10560388A Expired - Fee Related JP2636323B2 (en) 1988-04-28 1988-04-28 Turning speed control device for construction tower crane

Country Status (1)

Country Link
JP (1) JP2636323B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101798456B1 (en) * 2016-01-27 2017-12-21 (주)뉴텍 Hydraulic salvage device with a load control

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2782397B2 (en) * 1992-02-20 1998-07-30 新日本製鐵株式会社 Adjustment method of moment of inertia of rotating mechanism
CN103879913B (en) * 2014-03-06 2016-03-02 中联重科股份有限公司 To the method, apparatus and system that the swing type mechanism of tower crane controls
CN105384095A (en) * 2015-12-28 2016-03-09 中科院成都信息技术股份有限公司 Variable-frequency-speed-adjusting control system and method of tower-crane rotating mechanism
JP6730127B2 (en) * 2016-08-05 2020-07-29 古河ユニック株式会社 Crane speed control device and vehicle-mounted crane equipped with the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101798456B1 (en) * 2016-01-27 2017-12-21 (주)뉴텍 Hydraulic salvage device with a load control

Also Published As

Publication number Publication date
JPH0289799A (en) 1990-03-29

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