JPH083434Y2 - Load drop prevention device for hoisting device - Google Patents
Load drop prevention device for hoisting deviceInfo
- Publication number
- JPH083434Y2 JPH083434Y2 JP1991092691U JP9269191U JPH083434Y2 JP H083434 Y2 JPH083434 Y2 JP H083434Y2 JP 1991092691 U JP1991092691 U JP 1991092691U JP 9269191 U JP9269191 U JP 9269191U JP H083434 Y2 JPH083434 Y2 JP H083434Y2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- detector
- boom
- hydraulic
- rope
- 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 - Lifetime
Links
Landscapes
- Control And Safety Of Cranes (AREA)
- Jib Cranes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は巻上装置の吊荷落下防止
装置に関するものである。自動ブレ−キを採用した油圧
式巻上装置において、巻上操作をした瞬間に意に反して
一瞬荷が巻下る不具合をなくし、安全で操作性にすぐれ
た巻上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 hanging load drop prevention device for a hoisting device. The present invention relates to a hydraulic hoisting device that employs an automatic brake, which eliminates the problem that the load is unwound for a moment against the moment of hoisting operation, and is safe and easy to operate.
【０００２】[0002]
【従来の技術】図３は油圧式巻上装置で、１は油圧モ−
タ、２は油圧モ−タ１のトルクを増巾する為の減速機、
３は減速機２の出力を取り出す出力軸、４は出力軸３に
結合され、回転力をワイヤ−ドラム５に伝達する為のク
ラッチである。６はワイヤ−ドラム５を回動不能に保持
する為のブレ−キである。2. Description of the Related Art FIG. 3 shows a hydraulic hoisting device, 1 being a hydraulic motor.
2 is a speed reducer for increasing the torque of the hydraulic motor 1,
Reference numeral 3 is an output shaft for taking out the output of the speed reducer 2, and reference numeral 4 is a clutch which is coupled to the output shaft 3 and which transmits a rotational force to the wire-drum 5. Reference numeral 6 is a brake for holding the wire drum 5 in a non-rotatable manner.
【０００３】図４は従来の巻上装置の油圧回路で、７は
荷を油圧で保持するカウンタ−バランス弁、８は油圧モ
−タ１の回転方向と速度を制御する方向流量調整弁、９
は方向流量調整弁８を切替えるパイロット油圧を発生さ
せるリモコン弁、１０はリモコン弁９の発生させる巻上
側パイロット圧と巻下側パイロット圧の高圧選択をする
シャトル弁、１１はリモコン弁９が操作されているか否
かを検出する圧力スイッチである。又１６は油圧モ−タ
１とカウンタ−バランス弁７の間の管路、１７はモ−タ
のドレン配管である。FIG. 4 shows a hydraulic circuit of a conventional hoisting machine, 7 is a counter balance valve for holding a load hydraulically, 8 is a directional flow regulating valve for controlling the rotating direction and speed of the hydraulic motor 1, and 9
Is a remote control valve for generating a pilot hydraulic pressure for switching the directional flow control valve 8, 10 is a shuttle valve for selecting a high pressure between the winding-up side pilot pressure and the winding-down side pilot pressure generated by the remote control valve 9, and 11 is a remote control valve 9 operated. It is a pressure switch that detects whether or not it is on. Reference numeral 16 is a pipe line between the hydraulic motor 1 and the counter balance valve 7, and 17 is a drain pipe of the motor.
【０００４】図５は従来の自動ブレ−キ解除機構であ
り、１８は電源、１２と１３は自動ブレ−キをオン・オ
フする為のソレノイドバルブ及び油圧シリンダ−であ
る。FIG. 5 shows a conventional automatic brake releasing mechanism, in which 18 is a power source and 12 and 13 are solenoid valves and hydraulic cylinders for turning on and off the automatic brake.
【０００５】図６は巻上装置の作動を示し、ドラム５に
巻取られたロ−プ１４に負荷１５が吊り下がっている状
態である。FIG. 6 shows the operation of the hoisting device, in which the load 15 is suspended from the rope 14 wound around the drum 5.
【０００６】[0006]
【従来装置の作動】今リモコン弁９をａ側へ操作する
と、パイロット圧Ｐa が発生し、方向流量調整弁８を左
へ動かし、図示されてないポンプの吐出油はカウンタ−
バランス弁７のチェック弁を押し開け、管路１６を通過
し、負荷１５に見合った圧力ＰA を発生させて油圧モ−
タ１を回転させる。油圧モ−タ１の回転は減速機２でト
ルクを増巾され、出力軸３を回転させる。出力軸３の回
転はクラッチ４を介してドラム５に伝わりドラムを回転
させ、ロ−プ１４を巻取り負荷１５が巻上げられる。Operation of the conventional apparatus Now, when the remote control valve 9 is operated to the side a, the pilot pressure Pa is generated, the directional flow rate adjusting valve 8 is moved to the left, and the discharge oil of the pump (not shown) is countered.
The check valve of the balance valve 7 is pushed open to pass through the pipe line 16 to generate a pressure PA commensurate with the load 15 to generate the hydraulic pressure.
Rotate data 1. The rotation of the hydraulic motor 1 is increased in torque by the speed reducer 2 to rotate the output shaft 3. The rotation of the output shaft 3 is transmitted to the drum 5 via the clutch 4 to rotate the drum, and the rope 14 is wound to load the load 15.
【０００７】又この時同時に圧力Ｐaは圧力スイッチ１
１を作動させ(図５）ソレノイドバルブ１２に電流が流
れて切換わり、パイロット油圧源の圧力がブレ−キ解放
シリンダ−１３に流入しブレ−キ６を解放する。At the same time, the pressure Pa is controlled by the pressure switch 1 at the same time.
1 is operated (FIG. 5), a current flows through the solenoid valve 12 for switching, and the pressure of the pilot hydraulic pressure source flows into the brake release cylinder 13 to release the brake 6.
【０００８】次にリモコン弁９を中立に戻すと、油圧１
９はタンクにつながりＰa≒０ となり方向流量調整弁８
はバネの力で中立に戻り、モ−タ１への油の供給が止
り、モ−タは回転を停止する。この時油圧モ−タ１は負
荷１５から逆転させようとする力を受けており、この力
とカウンタ−バランス弁７により管路１６に閉じこめら
れた油が圧縮され、圧力ＰAを発生させてこれを支えて
いる。Next, when the remote control valve 9 is returned to neutral, the hydraulic pressure 1
9 is connected to the tank and Pa ≈ 0, so the directional flow adjustment valve 8
Is returned to the neutral state by the force of the spring, the oil supply to the motor 1 is stopped, and the motor stops rotating. At this time, the hydraulic motor 1 receives a force for reversing from the load 15, and this force and the oil trapped in the pipe 16 by the counter balance valve 7 are compressed to generate a pressure PA. Is supporting.
【０００９】一方Ｐa≒０ となる事により、圧力スイッ
チ１１は中立に戻り、ソレノイドバルブ１２もばねによ
り中立に戻り、油圧シリンダ−１３はタンクにつなが
り、バネの力でシリンダ−１３は押し戻され、ブレ−キ
６がバネ力で作動し、負荷１５はブレ−キ６で支えられ
る。On the other hand, when Pa≈0, the pressure switch 11 is returned to the neutral position, the solenoid valve 12 is also returned to the neutral position by the spring, the hydraulic cylinder 13 is connected to the tank, and the cylinder 13 is pushed back by the force of the spring. The brake 6 is operated by spring force, and the load 15 is supported by the brake 6.
【００１０】この状態で放置しておくと管路１６に閉じ
こめられた油は油圧モ−タ１の内部リ−クとしてドレン
管路１７を介してタンクへ逃げる。この時逃げる油の量
は管路１６内の油が圧力ＰAにより圧縮されて縮んでい
た分△Ｑ1と、トルク伝達機構が負荷１５により発生す
るトルクで変形していたのが、ブレ−キにより負荷を支
えた後は、トルクが作用しなくなり変形がもとに戻る際
に発生する回転に伴う△Ｑ2分であり、これだけの油が
リ−クした後は管路１６の圧力はほぼ０となる。If left in this state, the oil trapped in the pipe 16 escapes to the tank via the drain pipe 17 as an internal leak of the hydraulic motor 1. The amount of this time escaping oil and minute △ Q 1 where the oil in the conduit 16 had shrunk been compressed by the pressure PA, that has been modified by the torque torque transmitting mechanism is generated by the load 15, blur - key After bearing the load, ΔQ 2 minutes is due to the rotation that occurs when the torque no longer acts and the deformation returns to its original state. After this much oil leaks, the pressure in the pipe 16 is almost It becomes 0.
【００１１】次に再びリモコン弁９を巻上側に操作する
と、すでに説明した通りブレ−キ６が解放され、負荷１
５は油圧で支えられる事になるが、ポンプからの油の供
給がまにあわず、保持圧は前述の如くほぼ０であり、こ
の保持圧がＰA に上昇するまでドラムは負荷により回転
する。この時の回転する量は前述のリ−ク分相当であ
り、モ−タ吸収量をｑ、減速比をｉとすると、別紙数式
１の回転となる。Next, when the remote control valve 9 is operated to the upper side of the winding again, the brake 6 is released as described above, and the load 1 is released.
Although 5 is supported by hydraulic pressure, the supply of oil from the pump is not appropriate, the holding pressure is almost 0 as described above, and the drum rotates by the load until the holding pressure rises to PA. The amount of rotation at this time is equivalent to the above-mentioned leak amount, and when the motor absorption amount is q and the reduction ratio is i, the rotation is as shown in the attached mathematical expression 1.
【００１２】[0012]
【数１】 [Equation 1]
【００１３】従って、オペレ−タは巻上操作をしたにも
かかわらず一瞬荷が落下する為、非常に危険である。Therefore, the operator drops the load for a moment despite the hoisting operation, which is very dangerous.
【００１４】[0014]
【考案が解決しようとする課題】巻上操作をした瞬間
に、意に反して一瞬荷物が巻下る不具合をなくし、安全
かつ操作性に優れた巻上装置を提供することを目的とす
る。SUMMARY OF THE INVENTION It is an object of the present invention to provide a hoisting device which is safe and has excellent operability by eliminating the problem that the luggage is unwound unintentionally for a moment at the moment of hoisting operation.
【００１５】[0015]
【課題を解決するための手段】 クレーンのブーム２５
を支持している支持ロープ２６に張力検出器２７を設
け、ブーム角度を測定する角度検出器２２と、負荷を吊
り上げるロープ１４を前記ブーム２５の頂部から垂下さ
せると共に、他端をブーム背後の油圧式巻上装置のドラ
ム５に巻き取られるようにし、そのドラム５の回転を検
出するためのドラム回転検出器２３を設けた巻上げ装置
において、モーメントリミッタ演算部２１で支持ロープ
２６の張力検出器２７と、ブーム角度検出器２２の信号
を基にロープ張力Ｆを算出し、又ドラム回転検出器２３
の信号からワイヤロープ１４のドラム半径Ｒを算出し
て、これら２つから油圧モータ１の保持圧ＰＡを演算
し、該保持圧信号により、該モータ保持圧ＰＡにほゞ等
しい圧力の油を油圧モータ１とカウンターバランス弁７
の間の管路１６に油圧源２０から供給する様電磁比例リ
リーフ弁２９で制御するようにした。 或いは又支持ロー
プの張力検出に代え、ブーム起伏を行う油圧シリンダに
圧力検出器を設け、該圧力検出器による検出圧信号をモ
ーメントリミッタ演算部２１に送って同様に制御できる
ようにした。 [Means for Solving the Problems] Boom 25 of crane
The tension detector 27 is installed on the support rope 26 supporting the
Angle, the angle detector 22 that measures the boom angle, and the load
Suspend the lifting rope 14 from the top of the boom 25.
The other end of the hydraulic hoist behind the boom.
So that the drum 5 can be wound up and the rotation of the drum 5 can be detected.
Winding device provided with drum rotation detector 23 for taking out
At the moment limiter calculation unit 21, the support rope is
Signals of tension detector 27 of 26 and boom angle detector 22
The rope tension F is calculated based on the
Calculate the drum radius R of the wire rope 14 from the signal
Then, the holding pressure PA of the hydraulic motor 1 is calculated from these two values.
Then, the holding pressure signal causes the motor holding pressure PA to be approximately equal.
The hydraulic motor 1 and the counter balance valve 7 apply the oil of a fresh pressure.
So that the pipe line 16 between
It was controlled by the leaf valve 29. Or support low
The hydraulic cylinder that raises and lowers the boom instead of
Provide a pressure detector and monitor the pressure signal detected by the pressure detector.
The same can be controlled by sending it to the operation limiter calculation unit 21.
I did it.
【００１６】[0016]
【実施例】図１と図２に基いて説明する。図１は公知の
油圧回路である図４と比較し、油圧源２０、モ−メント
リミッタ演算部２１、逆止弁２８、電磁比例リリ−フ弁
２９が管路１６に追加されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS An explanation will be given with reference to FIGS. 1 and 2. As compared with FIG. 4 which is a known hydraulic circuit, FIG. 1 additionally includes a hydraulic pressure source 20, a moment limiter calculation unit 21, a check valve 28, and an electromagnetic proportional relief valve 29 in the conduit 16.
【００１７】図２にモ−メントリミッタの一例を示す。
図２で２５はブ−ム、２６はブ−ムを支持している支持
ロ−プ、２７は支持ロ−プの張力を検出する張力検出
器、２２はブ−ムの角度を測定する角度検出器、２３は
ドラムの回転を検出する検出器、２４は表示器であり、
２１がモ−メントリミッタ演算部である。FIG. 2 shows an example of the moment limiter.
In FIG. 2, 25 is a boom, 26 is a support rope that supports the boom, 27 is a tension detector that detects the tension of the support rope, and 22 is an angle that measures the angle of the boom. A detector, 23 is a detector for detecting the rotation of the drum, and 24 is an indicator,
21 is a moment limiter calculation unit.
【００１８】モ−メントリミッタ演算部２１は角度検出
器２２により検出したブ−ム角度より演算した負荷１５
の半径と、張力検出器２７により検出したブ−ム２５の
転倒モ−メントと演算装置内に記憶したデ−タより負荷
１５の重さを算出するものであり、ロ−プ１本当りの張
力Ｆ及びドラム回転検出器２３によりドラム５に巻取ら
れているロ−プ１４の半径Ｒも検出することができる。The moment limiter calculator 21 calculates the load 15 calculated from the boom angle detected by the angle detector 22.
The weight of the load 15 is calculated from the radius of the load, the falling moment of the boom 25 detected by the tension detector 27, and the data stored in the arithmetic unit. The tension F and the drum rotation detector 23 can also detect the radius R of the rope 14 wound around the drum 5.
【００１９】[0019]
【作動】 モーメントリミッタ演算部２１で算出したロ
ープ張力Ｆと半径Ｒより出力軸３に加わるトルクは、Ｔ
＝Ｆ・Ｒ ・・・で求まる。このトルクを支えるの
に必要な保持圧（又は上圧）ＰＡは別紙数式２で求ま
る。[Operation] The torque applied to the output shaft 3 from the rope tension F and the radius R calculated by the moment limiter calculation unit 21 is T
= F ・ R ... The holding pressure (or upper pressure ) PA required to support this torque can be calculated by the attached mathematical expression 2.
【００２０】[0020]
【数２】 [Equation 2]
【００２１】式でｉは減速比、ｑはモ−タ吸収量、η
は効率で既知である。In the equation, i is the reduction ratio, q is the motor absorption amount, and η
Is known for efficiency.
【００２２】 従って、，式よりＰＡをモーメント
リミッタ演算部２１で演算できる。モーメントリミッタ
演算部２１は電磁比例リリーフ弁２９のリリーフ圧をＰ
Ａに制御し、油圧源２０から逆止弁２８を通して管路１
６に油を供給する。この時油圧源２０の供給油量をドレ
ン管路１７から逃げる油量以上に設定しておけば、管路
１６の圧力はＰＡに保たれ、何時ブレーキが解放されて
も油圧で負荷１５を保持する事ができ、巻上時にも巻下
時にも荷の瞬時落下は起きない。なお図の例ではブーム
の起伏をロープで行う例について示したが、これを油圧
シリンダで起伏させる場合には、油圧シリンダの油圧を
検出すべく圧力検出器を設け、該圧力検出器による圧力
信号をモーメントリミッタ演算部２１に送るようにして
もよい。 Therefore, PA can be calculated by the moment limiter calculation unit 21 from the equation. The moment limiter calculation unit 21 sets the relief pressure of the electromagnetic proportional relief valve 29 to P
A to control the hydraulic pressure from the hydraulic power source 20 through the check valve 28
Supply oil to 6. At this time, if the amount of oil supplied from the hydraulic pressure source 20 is set to be equal to or greater than the amount of oil that escapes from the drain pipe line 17, the pressure in the pipe line 16 will be maintained at PA and the load 15 will be held hydraulically regardless of the time when the brake is released. The load does not drop instantaneously during winding or winding. In the example in the figure, the boom
We have shown an example of undulating the rope with a rope.
When undulating with a cylinder, change the hydraulic pressure of the hydraulic cylinder.
A pressure detector is provided to detect the pressure by the pressure detector.
The signal is sent to the moment limiter calculation unit 21.
Good.
【００２３】[0023]
【効果】 モーメントリミッタ演算部２１で支持ロープ
２６の張力検出器２７又はブ−ム起伏用の油圧シリンダ
の圧力検出器と、ブーム角度検出器２２の信号を基にロ
ープ張力Ｆを算出し、又ドラム回転検出器２３の信号か
らワイヤロープ１４のドラム半径Ｒを算出して、これら
２つから油圧モータ１の保持圧を演算し、該保持圧信号
により、該モータ保持圧にほゞ等しい圧力の油を油圧モ
ータ１とカウンターバランス弁７の間の管路１６に油圧
源２０から供給する様電磁比例リリーフ弁２９で制御す
るようにしたので、管路１６の圧力は保持圧ＰＡに保た
れ、何時ブレーキが解放されても油圧で負荷１５を保持
する事ができ、巻上時にも巻下時にも荷の瞬時落下は起
きない。この結果極めて安全で操作性の優れた巻上装置
を提供することが可能となった。[Effect] The rope supported by the moment limiter calculator 21
26 tension detector 27 or hydraulic cylinder for boom undulation
Based on the signals from the pressure detector and boom angle detector 22
Is calculated from the signal from the drum rotation detector 23.
Calculate the drum radius R of the wire rope 14,
The holding pressure of the hydraulic motor 1 is calculated from the two, and the holding pressure signal is calculated.
Allows the oil pressure equal to the motor holding pressure to be
Hydraulic pressure on the line 16 between the motor 1 and the counterbalance valve 7.
It is controlled by an electromagnetic proportional relief valve 29 so that it is supplied from the source 20.
Since the pressure in the pipe line 16 is kept at the holding pressure PA, the load 15 can be held hydraulically regardless of the release of the brake. Don't get up As a result, it is possible to provide a hoisting device that is extremely safe and has excellent operability.
【図１】本考案の油圧回路図。FIG. 1 is a hydraulic circuit diagram of the present invention.
【図２】モ−メントリミッタの一例を示す。FIG. 2 shows an example of a moment limiter.
【図３】公知油圧巻上機の概略図。FIG. 3 is a schematic view of a known hydraulic hoist.
【図４】公知油圧巻上機の油圧回路図。FIG. 4 is a hydraulic circuit diagram of a known hydraulic hoist.
【図５】公知自動ブレ−キ解除機構。FIG. 5 is a known automatic brake release mechanism.
【図６】巻上装置の作動状態における斜視図。FIG. 6 is a perspective view of the hoisting device in an operating state.
１ 油圧モ−タ ２ 減速機 ３ 出力軸 ４ クラッチ ５ ワイヤ−ドラム ６ ブレ−キ ７ カウンタ−バランス弁 ８ 方向流量調整弁 ９ リモコン弁 10 シヤトル弁 11 圧力スイッチ 12 ソレノイドバル
ブ 13 油圧シリンダ− 14 ロ−プ 15 負荷 16 管路 17 ドレン管路 18 電源 19 油圧 20 油圧源 21 モ−メントリミッタ演算部 22 角度検出器 23 ドラム回転検出器 24 表示器 25 ブ−ム 26 支持ロ−プ 27 張力検出器 28 逆止弁 29 リリ−フ弁1 Hydraulic Motor 2 Reducer 3 Output Shaft 4 Clutch 5 Wire-Drum 6 Break 7 Counter-Balance Valve 8 Directional Flow Control Valve 9 Remote Control Valve 10 Shuttle Valve 11 Pressure Switch 12 Solenoid Valve 13 Hydraulic Cylinder-14 Low- 15 Load 16 Pipe line 17 Drain line 18 Power supply 19 Hydraulic pressure 20 Hydraulic pressure source 21 Moment limiter calculation unit 22 Angle detector 23 Drum rotation detector 24 Indicator 25 Boom 26 Support rope 27 Tension detector 28 Check valve 29 Release valve
Claims (2)
る支持ロープ（２６）に張力検出器（２７）を設け、ブ
ーム角度を測定する角度検出器（２２）と、負荷を吊り
上げるロープ（１４）を前記ブーム（２５）の頂部から
垂下させると共に、他端をブーム背後の油圧式巻上装置
のドラム（５）に巻き取られるようにし、そのドラム
（５）の回転を検出するドラム回転検出器（２３）を設
けた巻上げ装置において、モーメントリミッタ演算部
（２１）で支持ロープ（２６）の張力検出器（２７）
と、ブーム角度検出器（２２）の信号を基にロープ張力
（Ｆ）を算出し、又ドラム回転検出器（２３）の信号か
らワイヤロープ（１４）のドラム半径Ｒを算出し、これ
ら２つから油圧モータ（１）の保持圧（ＰＡ）を演算
し、該保持圧信号により、該モータ保持圧（ＰＡ）にほ
ゞ等しい圧力の油を油圧モータ（１）とカウンターバラ
ンス弁（７）の間の管路（１６）に油圧源（２０）から
供給する様電磁比例リリーフ弁（２９）で制御するよう
にした巻上装置の負荷落下防止装置。1. A crane boom (25) is supported.
Install a tension detector (27) on the support rope (26)
The angle detector (22) that measures the arm angle and the load are suspended.
Raise the rope (14) from the top of the boom (25)
A hydraulic hoisting device that hangs down and the other end behind the boom.
The drum (5) of the
A drum rotation detector (23) for detecting the rotation of (5) is installed.
Moment limiter calculation unit in the beam hoist
Tension detector (27) of support rope (26) at (21)
And rope tension based on the signal from the boom angle detector (22)
(F) is calculated, and is it a signal from the drum rotation detector (23)?
And the drum radius R of the wire rope (14) is calculated.
The holding pressure (PA) of the hydraulic motor (1) is calculated from the two
The motor holding pressure (PA) is adjusted by the holding pressure signal.
ゞ Separate oil of equal pressure with hydraulic motor (1) and counter
From the hydraulic source (20) to the conduit (16) between the valve (7)
To be controlled by an electromagnetic proportional relief valve (29)
Load drop prevention device for the hoisting device.
伏を行う油圧シリンダに圧力検出器を設け、該圧力検出
器による検出圧信号をモーメントリミッタ演算部（２
１）に送るようにした請求項１の巻上装置の負荷落下防
止装置。 2. A boom starter is used instead of the tension detection of the support rope.
A pressure detector is installed on the hydraulic cylinder that performs
The moment pressure limiter calculation unit (2
The load drop prevention of the hoisting device according to claim 1, wherein
Stop device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991092691U JPH083434Y2 (en) | 1991-10-17 | 1991-10-17 | Load drop prevention device for hoisting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991092691U JPH083434Y2 (en) | 1991-10-17 | 1991-10-17 | Load drop prevention device for hoisting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0595988U JPH0595988U (en) | 1993-12-27 |
| JPH083434Y2 true JPH083434Y2 (en) | 1996-01-31 |
Family
ID=14061519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1991092691U Expired - Lifetime JPH083434Y2 (en) | 1991-10-17 | 1991-10-17 | Load drop prevention device for hoisting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH083434Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3068772B2 (en) * | 1995-08-31 | 2000-07-24 | 日立建機株式会社 | Drilling rig control device |
| EP0779239B2 (en) * | 1995-12-13 | 2006-09-13 | Liebherr-Werk Ehingen GmbH | Crane hoist control |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5139312U (en) * | 1974-09-18 | 1976-03-24 | ||
| JPS5633315A (en) * | 1979-08-27 | 1981-04-03 | Kiyoutaru Shokuhin Kogyo Kk | Transferring device for shari hako (rice box) type or other box type container |
| JPS5647335A (en) * | 1979-09-27 | 1981-04-30 | Shin Meiwa Ind Co Ltd | Side guard for vehicle |
| JPS6136546U (en) * | 1984-08-06 | 1986-03-06 | 三菱重工業株式会社 | wind tunnel |
| EP0397912B1 (en) * | 1989-05-19 | 1994-08-10 | Siemens Aktiengesellschaft | Method and network arrangement for obtaining the output signals gradient of a given network for processing time discrete signals in relation to their network parameters |
-
1991
- 1991-10-17 JP JP1991092691U patent/JPH083434Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0595988U (en) | 1993-12-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3508662B2 (en) | Hydraulic drive winch control method and device | |
| JPH083434Y2 (en) | Load drop prevention device for hoisting device | |
| JPH0891772A (en) | Prevention of random winding of wire rope in excessive winding of winch of shiftable crane, and device therefor | |
| JP4759788B2 (en) | Control device for hydraulic drive winch | |
| JPH0736949Y2 (en) | Load drop prevention device for hoisting device | |
| JP2771139B2 (en) | Control device for hoisting device | |
| JP2713695B2 (en) | Hydraulic winch device | |
| JPH11301968A (en) | Work machine equipped with hydraulic hoisting device for delivering rope at very slow speed | |
| JP4006787B2 (en) | Control device for hydraulic drive winch | |
| JP2713696B2 (en) | Hydraulic winch device | |
| JP2003146587A (en) | Control device for winch | |
| JP2752595B2 (en) | Hydraulic winch device | |
| JPH11335086A (en) | Hydraulic hoist device and work machine mounting the hydraulic host device | |
| JP2738660B2 (en) | Hydraulic winch device | |
| JP2003261289A (en) | Instant lowering preventive device for hydraulic winch | |
| JP3351250B2 (en) | Control method and control device for hoisting device | |
| JPH0725589A (en) | Hydraulic drive device for revolution of crane | |
| JP7396417B1 (en) | Winch control device and crane equipped with it | |
| JPH08217389A (en) | Hydraulic winch device | |
| JP2553598Y2 (en) | Hydraulic drive winch drop prevention device | |
| JPH11246181A (en) | Hydrualic winding-up device and work vehicle equipped with the hydrualic winding-up device | |
| JPH1030604A (en) | Hydraulic motor control device | |
| JPH11255488A (en) | Hydraulic hoisting device and work machine mounting this hydraulic hoisting device | |
| JP2556922Y2 (en) | Mobile crane winding prevention device | |
| JPS6343246Y2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |