JP4425047B2 - Hydraulic lifting device - Google Patents

Hydraulic lifting device Download PDF

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JP4425047B2
JP4425047B2 JP2004123878A JP2004123878A JP4425047B2 JP 4425047 B2 JP4425047 B2 JP 4425047B2 JP 2004123878 A JP2004123878 A JP 2004123878A JP 2004123878 A JP2004123878 A JP 2004123878A JP 4425047 B2 JP4425047 B2 JP 4425047B2
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hydraulic
flow path
suspended load
hydraulic actuator
stop signal
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JP2005306538A (en
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光晴 中沢
毅 鈴木
晋也 山本
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Tcm株式会社
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Description

本発明は、吊荷を昇降させるための油圧式昇降装置に関するものである。 The present invention relates to a hydraulic lifting device for lifting and lowering a suspended load.

コンテナ等の吊荷を昇降させる装置として、例えば、吊荷を吊り部材を介してワイヤーロープにて昇降させる油圧ウインチが知られている。この油圧ウインチにおいて、油圧ウインチのドラムを回転させる油圧モータを有する油圧回路は、ウインチ巻き下げ動作時に吊り部材の下降動作、下降速度を制限するためのカウンタバランス弁が、巻き上げ方向の送り側流路(管路)に設けられている(例えば、特許文献1参照)。
特開2002−12391号公報
As a device for raising and lowering a suspended load such as a container, a hydraulic winch for raising and lowering a suspended load with a wire rope via a suspension member is known, for example. In this hydraulic winch, the hydraulic circuit having a hydraulic motor that rotates the drum of the hydraulic winch has a counter balance valve for limiting the lowering speed and the lowering speed of the suspension member during the winch lowering operation. (For example, refer to Patent Document 1).
JP 2002-12391 A

油圧ウインチにおいて、作動油が閉回路内を循環する油圧回路では可変容量油圧ポンプが使用されており、油圧ウインチのドラムの巻き下げを停止させるための停止信号を入力してから、実際にポンプの吐出が停止(吐出圧が低下)するまでにタイムラグが生ずる。つまり、可変容量ポンプの吐出が0になる(吐出圧が低下する)まで、ドラムは下降動作方向へ回転する。その結果、例えば、ワイヤーロープに接続させたコンテナ吊用スプレッダ等の吊り部材をコンテナ(吊荷)に連結させるために、吊り部材をコンテナに対して降下させ吊り部材がコンテナ上に着床し停止信号が発信されても、その後、ドラムからワイヤーロープがさらに送り出され、ワイヤーロープにゆるみが発生してしまう。   In a hydraulic winch, a variable displacement hydraulic pump is used in a hydraulic circuit in which hydraulic oil circulates in a closed circuit. After inputting a stop signal for stopping the lowering of the hydraulic winch drum, the pump actually There is a time lag before the discharge stops (discharge pressure decreases). That is, the drum rotates in the lowering operation direction until the discharge of the variable displacement pump becomes zero (the discharge pressure decreases). As a result, for example, in order to connect a suspension member such as a container suspension spreader connected to a wire rope to the container (suspended load), the suspension member is lowered with respect to the container and the suspension member is landed on the container and stopped. Even if the signal is transmitted, the wire rope is further sent out from the drum, and the wire rope is loosened.

本発明に係る油圧式昇降装置は、可変容量油圧ポンプと、該油圧ポンプに第1流路及び第2流路を介して接続された油圧式アクチュエータと、該第1流路側に設けられ該第2流路側の内圧をパイロット圧とするカウンタバランス弁と、を備えた油圧式昇降装置に於て、上記油圧式アクチュエータによる降下動作を停止すべき停止信号が入力された際に上記第1流路と上記第2流路とを連通状態とする開閉切換弁を有するバイパス流路が、上記カウンタバランス弁よりも上記油圧ポンプ側に設けられたものである。   A hydraulic lifting apparatus according to the present invention includes a variable displacement hydraulic pump, a hydraulic actuator connected to the hydraulic pump via a first flow path and a second flow path, and the first flow path provided on the first flow path side. In a hydraulic lifting apparatus having a counter balance valve that uses the internal pressure on the two flow paths as a pilot pressure, the first flow path when a stop signal for stopping the lowering operation by the hydraulic actuator is input And a bypass flow path having an open / close switching valve that communicates with the second flow path is provided closer to the hydraulic pump than the counter balance valve.

また、上記油圧式アクチュエータは、吊荷を吊り持ちする昇降自在な吊り部材と接続され、該吊り部材が降下して該吊荷に対して連結可能所定位置に達すると上記停止信号を発信させる制御手段を備えたものである。
また、上記油圧式アクチュエータは、吊荷を吊り持ちする昇降自在な吊り部材と接続され、該吊り部材と該吊荷との距離を検知して連結可能接近状態を検出する位置センサと、該位置センサによる検出信号にて上記停止信号を発信させる制御手段と、を有するものである。
或いは、上記油圧式アクチュエータは油圧モータとされ、該油圧モータは、吊荷を吊り持ちする吊り部材を昇降自在とさせるワイヤーロープ用ドラムと接続され、該吊り部材と接続されるワイヤーロープの張力の低下を検出する荷重センサと、該荷重センサの検出信号にて上記停止信号を発信させる制御手段と、を有するものである。
In addition, the hydraulic actuator is connected to a lifting member that can lift and lower a suspended load. When the hanging member descends and reaches a predetermined position that can be connected to the suspended load, the hydraulic actuator is controlled to transmit the stop signal. Means are provided.
Further, the hydraulic actuator is connected to a lifting member that can lift and lift a suspended load, detects a distance between the hanging member and the suspended load, and detects a connectable approach state; and And a control means for transmitting the stop signal in response to a detection signal from the sensor.
Alternatively, the hydraulic actuator is a hydraulic motor, and the hydraulic motor is connected to a wire rope drum that allows a hanging member that holds a suspended load to move up and down, and the tension of a wire rope connected to the hanging member is increased. A load sensor that detects a decrease; and a control unit that transmits the stop signal using a detection signal of the load sensor.

本発明の油圧式昇降装置によれば、停止操作(停止信号)と油圧式アクチュエータの実際の降下停止にタイムラグを無くすることができる。油圧式アクチュエータの降下動作の停止の応答性を向上させることができる。つまり、降下動作を停止すべき停止信号にて(停止信号と同時に)バイパス流路の開閉切換弁を開けることで、第2流路側から油圧式アクチュエータへの流入圧(内圧)が瞬時に下がるため、カウンタバランス弁が直ぐに閉じ、油圧式アクチュエータを直ちに停止させることができる。吊り部材等が、正確な所望の位置に停止可能となり、吊荷や床面等に衝突することを防止できる。従って、油圧式昇降装置が油圧ウインチであって油圧式アクチュエータが油圧モータである場合、油圧モータに接続されるドラムの回転を瞬時に停止させることができ、巻き下げ過ぎによるワイヤーロープのたるみを防ぐことができる。   According to the hydraulic lifting device of the present invention, it is possible to eliminate a time lag between the stop operation (stop signal) and the actual descent stop of the hydraulic actuator. The response of stopping the descent operation of the hydraulic actuator can be improved. In other words, the inflow pressure (internal pressure) from the second flow path side to the hydraulic actuator is instantaneously decreased by opening the bypass flow path switching valve at the stop signal to stop the descent operation (simultaneously with the stop signal). The counter balance valve closes immediately and the hydraulic actuator can be stopped immediately. The suspension member or the like can be stopped at an accurate desired position, and can be prevented from colliding with a suspended load or a floor surface. Therefore, when the hydraulic lifting device is a hydraulic winch and the hydraulic actuator is a hydraulic motor, the rotation of the drum connected to the hydraulic motor can be stopped instantaneously, preventing the wire rope from sagging due to overwinding. be able to.

図1は、本発明に係る油圧式昇降装置の実施の一形態を示す概略構成図であり、この油圧式昇降装置は、例えば、コンテナ吊り用の油圧ウインチを備える油圧式のコンテナキャリア等とすることができる。そして、図1の昇降装置は油圧ウインチの場合を示し、油圧モータ13にドラム5が連結され、油圧モータ13の正逆回転によりドラム5にてワイヤーロープ6を巻き取り(巻き上げ)又は繰り出し(巻き下げ)することで、吊り部材4にて吊り持ちした吊荷Wを昇降させる。   FIG. 1 is a schematic configuration diagram showing an embodiment of a hydraulic lifting apparatus according to the present invention. This hydraulic lifting apparatus is, for example, a hydraulic container carrier provided with a hydraulic winch for container suspension. be able to. 1 shows a case of a hydraulic winch. The drum 5 is connected to the hydraulic motor 13, and the wire rope 6 is wound (wound up) or fed out (winded) by the drum 5 by forward and reverse rotation of the hydraulic motor 13. The suspended load W suspended by the suspension member 4 is moved up and down.

この油圧ウインチ(の油圧回路部)は、可変容量油圧ポンプPと、油圧ポンプPに第1流路A及び第2流路Bを介して接続された油圧式アクチュエータMと、第1流路A側に設けられ第2流路B側の内圧をパイロット圧とするカウンタバランス弁1と、を備えている。符号19はカウンタバランス弁1用のパイロット回路(流路)である。また、油圧ウインチは、油圧回路部の油圧モータ13に接続されたドラム5と、ドラム5に巻設されたワイヤーロープ6と、ワイヤーロープ6の先端部において接続される吊り部材4と、を具備する。   The hydraulic winch (hydraulic circuit portion thereof) includes a variable displacement hydraulic pump P, a hydraulic actuator M connected to the hydraulic pump P via a first flow path A and a second flow path B, and a first flow path A. And a counter balance valve 1 that is provided on the side and uses the internal pressure on the second flow path B side as a pilot pressure. Reference numeral 19 denotes a pilot circuit (flow path) for the counter balance valve 1. The hydraulic winch includes a drum 5 connected to the hydraulic motor 13 of the hydraulic circuit section, a wire rope 6 wound around the drum 5, and a suspension member 4 connected at the tip of the wire rope 6. To do.

吊り部材4を具体的に説明すると、例えば、吊り部材4はコンテナ(吊荷W)を吊り持ちするスプレッダとされる。また、コンテナの上面四角には夫々被掛止孔部(図示省略)が形成され、また、スプレッダは水平状の吊り枠部材でありコンテナの被掛止孔部に掛止する掛止部(ツイストロック12)が四角に設けられている。そして、スプレッダのすべての掛止部がコンテナ上面の被掛止孔部に挿入状となって着床し掛止し、コンテナを吊り持ちすることができる。なお、吊り部材4は、ツイストロックを有するスプレッダ以外であってもよい。   The suspension member 4 will be specifically described. For example, the suspension member 4 is a spreader that suspends and holds a container (suspended load W). In addition, a hooking hole (not shown) is formed in each of the upper squares of the container, and the spreader is a horizontal suspension frame member that is hooked to the hooking hole of the container (twisted). Locks 12) are provided on the squares. And all the latching parts of a spreader can be inserted and inserted into the to-be-latched hole part of the container upper surface, can be hung, and can hold a container. The suspension member 4 may be other than a spreader having a twist lock.

図1において、本発明の油圧式昇降装置は、第1流路Aと第2流路Bとの間に、相互を連通状態可能とさせるバイパス流路2を有している。バイパス流路2は、カウンタバランス弁1よりも油圧ポンプP側に設けられ、バイパス流路2は、油圧式アクチュエータMによる降下動作を停止すべき停止信号が入力された際に、第1流路Aと第2流路Bとを連通状態とさせる開閉切換弁3を有する。
つまり、図1では、油圧式アクチュエータMが油圧モータ13であるため、油圧モータ13によるウインチ巻き下げ動作を停止すべき信号が入力された際に、第1流路Aと第2流路Bとを連通状態とする開閉切換弁3を有するバイパス流路2(バイパス回路)が設けられている。
In FIG. 1, the hydraulic lifting device of the present invention has a bypass flow path 2 between a first flow path A and a second flow path B that enables communication between them. The bypass flow path 2 is provided on the hydraulic pump P side with respect to the counter balance valve 1, and the bypass flow path 2 is the first flow path when a stop signal to stop the descent operation by the hydraulic actuator M is input. There is an open / close switching valve 3 for bringing A and the second flow path B into communication.
That is, in FIG. 1, since the hydraulic actuator M is the hydraulic motor 13, the first flow path A and the second flow path B when the signal for stopping the winch lowering operation by the hydraulic motor 13 is input. Is provided with a bypass flow path 2 (bypass circuit) having an open / close switching valve 3.

モータ等の駆動源11と接続された油圧ポンプPは可変容量式とされ、2つのポートの夫々に第1流路Aの一端側と第2流路Bの一端側とが(並列状に)接続され、これらの他端側が油圧モータ13(油圧式アクチュエータM)の2つのポートに夫々接続される。そして、第1流路Aの途中部にカウンタバランス弁1が配設されている。さらに、第1流路Aにおいてカウンタバランス弁1と並列状に逆止弁10が配設されている。   The hydraulic pump P connected to the drive source 11 such as a motor is of a variable displacement type, and one end side of the first flow path A and one end side of the second flow path B are connected in parallel to each of the two ports. These other ends are connected to two ports of the hydraulic motor 13 (hydraulic actuator M), respectively. A counter balance valve 1 is disposed in the middle of the first flow path A. Further, a check valve 10 is disposed in parallel with the counter balance valve 1 in the first flow path A.

そして、油圧ポンプPにより、作動油が矢印a方向へ吐出されると(第1流路A側が送り側流路となり第2流路B側が戻り側流路となると)、作動油は逆止弁10を通過し、油圧モータ13に作動油を送り、ドラム5が正回転してワイヤーロープ6を巻き上げ、吊り部材4を上昇させる。他方、作動油が矢印b方向へ吐出されると(第2流路B側が送り側流路となり第1流路A側が戻り側流路となると)、作動油は油圧モータ13へ送られ、パイロット圧により開状態となるカウンタバランス弁1を通過することで、ドラム5が逆回転してワイヤーロープ6を巻き下げ、吊り部材4を降下させる。   When the hydraulic oil is discharged in the direction of arrow a by the hydraulic pump P (when the first flow path A side becomes the feed side flow path and the second flow path B side becomes the return side flow path), the hydraulic oil becomes the check valve. Passing through 10, the hydraulic oil is sent to the hydraulic motor 13, and the drum 5 rotates forward to wind up the wire rope 6 and raise the suspension member 4. On the other hand, when the hydraulic oil is discharged in the direction of the arrow b (when the second flow path B side becomes the feed side flow path and the first flow path A side becomes the return side flow path), the hydraulic oil is sent to the hydraulic motor 13 and the pilot. By passing through the counter balance valve 1 which is opened by the pressure, the drum 5 rotates in the reverse direction, lowers the wire rope 6 and lowers the suspension member 4.

第1流路Aは、カウンタバランス弁1を挟んでポンプ側流路15とアクチュエータ側流路16とを有する。そして、カウンタバランス弁1は、吊り部材4の下降動作の際、油圧モータ13(油圧式アクチュエータM)とカウンタバランス弁1との間────即ちアクチュエータ側流路16────に保持圧力を立てて吊荷Wを安定して降下させるものであり、第2流路Bの圧力(パイロット圧)に応じて開閉動作する。つまり、第2流路Bに所定の設定圧が作用するとカウンタバランス弁1は開となり、設定圧未満では閉となる。なお、閉と開とが切り換わる設定圧力(開弁設定圧)は、90〜180kgf/cm2程度に設定されている。 The first flow path A has a pump side flow path 15 and an actuator side flow path 16 with the counter balance valve 1 interposed therebetween. The counter balance valve 1 is held between the hydraulic motor 13 (hydraulic actuator M) and the counter balance valve 1 when the suspension member 4 is lowered, that is, in the actuator side flow path 16. The suspended load W is stably lowered by raising the pressure, and opens and closes according to the pressure (pilot pressure) in the second flow path B. That is, the counter balance valve 1 is opened when a predetermined set pressure is applied to the second flow path B, and is closed when the pressure is less than the set pressure. In addition, the set pressure (valve open set pressure) at which switching between opening and closing is set to about 90 to 180 kgf / cm 2 .

バイパス流路2は、一端側が第1流路Aにおいて油圧ポンプPとカウンタバランス弁1との間(ポンプ側流路15)に接続され、他端側が第2流路Bにおいて油圧ポンプPと油圧モータ13との間と接続され、バイパス流路2の途中部に開閉切換弁3が設けられている。 開閉切換弁3はソレノイドにて動作するバイパスバルブであり、油圧式アクチュエータMの上昇動作及び下降動作途中の際は閉状態であり、油圧式アクチュエータMの降下動作を停止すべき停止信号により閉から開に切り換わる。なお、開閉切換弁3の開状態は停止信号入力から所定時間(例えば、2秒から5秒間)のみとするよう設定されている。つまり、所定時間開となれば、その後自動的に閉状態に復帰する。   The bypass flow path 2 has one end connected to the first flow path A between the hydraulic pump P and the counter balance valve 1 (pump side flow path 15), and the other end connected to the hydraulic pump P and the hydraulic pressure in the second flow path B. An open / close switching valve 3 is provided in the middle of the bypass flow path 2 and connected to the motor 13. The open / close switching valve 3 is a bypass valve operated by a solenoid, and is closed during the upward and downward movements of the hydraulic actuator M, and is closed by a stop signal to stop the downward movement of the hydraulic actuator M. Switch to open. Note that the open state of the on-off switching valve 3 is set to be only a predetermined time (for example, 2 to 5 seconds) from the stop signal input. In other words, when it is opened for a predetermined time, it automatically returns to the closed state.

降下動作を停止すべき停止信号は、この油圧式昇降装置の運転者が、運転席における巻き上げ下げレバーを下げ位置から停止位置とする降下動作の手動停止操作により発信される停止信号と、昇降装置が備える後述の制御手段8により自動発信される停止信号とがある。さらに、下限リミットスイッチ等(図示省略)により、吊り部材4が下限位置に達すると制御手段8により停止信号を発信させてもよい。   The stop signal to stop the descent operation is a stop signal transmitted by the driver of the hydraulic lifting device by a manual stopping operation of the lowering operation in which the hoisting / lowering lever in the driver's seat is moved from the lowered position to the stopped position, and the lifting device There is a stop signal automatically transmitted by the control means 8 described later. Furthermore, a stop signal may be transmitted by the control means 8 when the suspension member 4 reaches the lower limit position by a lower limit switch or the like (not shown).

また、本発明の昇降装置は、図7に示すように、一つのバイパス流路2において、並列接続させた2つの開閉切換弁3,3を有するよう構成してもよい。これは、例えば、一方が、上記手動停止操作にて電気的に作動させる開閉切換弁3であり、他方が、制御手段8による自動停止操作にて電気的に作動させる開閉切換弁3としたり、又は、停止信号により同時に両者を開状態とし、開閉切換弁3部における作動油の流量を増加させることもできる。   Further, as shown in FIG. 7, the lifting device of the present invention may be configured to have two open / close switching valves 3 and 3 connected in parallel in one bypass flow path 2. This is, for example, one of the opening / closing switching valve 3 that is electrically operated by the manual stopping operation and the other is the opening / closing switching valve 3 that is electrically operated by the automatic stopping operation by the control means 8, Alternatively, both can be simultaneously opened by a stop signal, and the flow rate of hydraulic oil in the opening / closing switching valve 3 can be increased.

図2と図3は、制御手段8による自動停止操作を説明する概略構成図であり、油圧式アクチュエータMは、吊荷Wを吊り持ちする昇降自在な吊り部材4と接続され、制御手段8は、吊り部材4が降下して吊荷Wに対して連結可能所定位置に達すると停止信号を発信させるよう構成されている。
つまり、油圧式アクチュエータMである油圧モータ13は、吊り部材4を昇降自在とさせるワイヤーロープ用ドラム5(図1参照)と接続され、制御手段8は、吊り部材4が降下して吊荷Wに対して連結可能所定位置に達するとウインチ巻き下げ動作を停止すべき停止信号を発信させる。
2 and 3 are schematic configuration diagrams for explaining the automatic stop operation by the control means 8. The hydraulic actuator M is connected to a lifting member 4 that can lift and lower a suspended load W, and the control means 8 is When the suspension member 4 is lowered and reaches a predetermined position where it can be connected to the suspended load W, a stop signal is transmitted.
That is, the hydraulic motor 13 that is the hydraulic actuator M is connected to the wire rope drum 5 (see FIG. 1) that allows the suspension member 4 to move up and down, and the control means 8 lowers the suspension load 4 when the suspension member 4 is lowered. When a connectable predetermined position is reached, a stop signal for stopping the winch lowering operation is transmitted.

具体的な構成を説明すると、昇降装置は、吊り部材4と吊荷Wとの距離を検知して連結可能接近状態を検出する位置センサ9(距離センサ)と、位置センサ9による検出信号にて(検出信号が入力されると)停止信号を発信させる制御手段8と、を有する。
位置センサ9は、接触式又は非接触式とすることができ、例えば、図2と図3のように非接触式レーザセンサとすることができ、位置センサ9を吊り部材4に設ける。これにより、吊り部材4から吊荷Wまでの距離の検出が可能となり、吊り部材4が降下し予め制御手段8にて設定した距離が検出されると(連結可能所定位置に達すると)、制御手段8からバイパス流路2の開閉切換弁3へ停止信号として開動作信号を発信させ、開閉切換弁3をソレノイドにて開状態とさせる。
Explaining a specific configuration, the lifting device detects a distance between the suspension member 4 and the suspended load W and detects a connectable approach state, and a detection signal from the position sensor 9. And a control means 8 for transmitting a stop signal (when a detection signal is input).
The position sensor 9 can be a contact type or a non-contact type. For example, it can be a non-contact type laser sensor as shown in FIGS. 2 and 3, and the position sensor 9 is provided on the suspension member 4. As a result, the distance from the suspension member 4 to the suspended load W can be detected, and when the suspension member 4 descends and the distance previously set by the control means 8 is detected (when reaching the connectable predetermined position), the control is performed. An opening operation signal is transmitted as a stop signal from the means 8 to the open / close switching valve 3 of the bypass flow path 2, and the open / close switching valve 3 is opened by a solenoid.

また、図6は、吊り部材4がスプレッダとされ、4台のツイストロック12…の夫々に位置センサ9を設けたものであり、吊荷Wを吊るスプレッダの四隅にあるツイストロック12…が全て吊荷Wに対して連結可能所定位置に達すると(4台のツイストロック12…が吊荷Wに着床すると)、制御手段8から信号が発信されるようにすれば、作業の確実性及び安全面において好ましい。   In FIG. 6, the suspension member 4 is a spreader, and a position sensor 9 is provided for each of the four twist locks 12... And the twist locks 12 at the four corners of the spreader for hanging the suspended load W are all. When a predetermined position connectable to the suspended load W is reached (when the four twist locks 12... Land on the suspended load W), if a signal is transmitted from the control means 8, work reliability and It is preferable in terms of safety.

そして、図2において、吊り部材4が降下動作中は、カウンタバランス弁1が開状態であり、バイパス流路2の開閉切換弁3は閉状態であり、矢印の方向に作動油が閉回路内を循環している。そして、図3のように、吊り部材4が吊荷Wに対して連結可能所定位置に達すると、位置センサ9の検知と制御手段8の働きにより開閉切換弁3を開状態とさせる。これにより、図3の矢印c,d,e,fのように作動油がバイパス流路2を流れ、第2流路B側の油圧モータ13への流入圧(内圧)が低下し(カウンタバランス弁1の開閉が切り換わる設定圧力未満に低下し)、カウンタバランス弁1が瞬時に閉じ、油圧モータ13が直ちに停止する。なお、バイパス流路2を流れる作動油のチャージ圧は、(カウンタバランス弁1の開閉が切り換わる設定圧力より小さい)20〜40kgf/cm2 程度となる。 In FIG. 2, while the suspension member 4 is being lowered, the counter balance valve 1 is open, the open / close switching valve 3 of the bypass flow path 2 is closed, and hydraulic oil flows in the closed circuit in the direction of the arrow. Is circulating. Then, as shown in FIG. 3, when the suspension member 4 reaches a predetermined position connectable to the suspended load W, the open / close switching valve 3 is opened by the detection of the position sensor 9 and the action of the control means 8. As a result, the hydraulic oil flows through the bypass flow path 2 as indicated by arrows c, d, e, and f in FIG. 3, and the inflow pressure (internal pressure) to the hydraulic motor 13 on the second flow path B side decreases (counter balance). The counter balance valve 1 is instantaneously closed and the hydraulic motor 13 is immediately stopped. Note that the charge pressure of the hydraulic oil flowing through the bypass passage 2 is about 20 to 40 kgf / cm 2 ( smaller than the set pressure at which the opening and closing of the counter balance valve 1 is switched).

図4と図5は、制御手段8による自動停止操作を説明する他の実施の形態の概略構成図である。この油圧式昇降装置は、油圧式アクチュエータMが油圧モータ13とされ、油圧モータ13は、吊荷Wを吊り持ちする吊り部材4を昇降自在とさせるワイヤーロープ用ドラム5(図1参照)と接続されている。そして、昇降装置は、吊り部材4と接続されるワイヤーロープ6の張力の低下を検出する荷重センサ7と、荷重センサ7の検出信号にて停止信号を発信させる制御手段8と、を有している。   4 and 5 are schematic configuration diagrams of another embodiment for explaining an automatic stop operation by the control means 8. In this hydraulic lifting apparatus, the hydraulic actuator M is a hydraulic motor 13, and the hydraulic motor 13 is connected to a wire rope drum 5 (see FIG. 1) that allows the suspension member 4 that holds the suspended load W to be lifted and lowered. Has been. The lifting device includes a load sensor 7 that detects a decrease in the tension of the wire rope 6 connected to the suspension member 4, and a control unit 8 that transmits a stop signal using the detection signal of the load sensor 7. Yes.

荷重センサ7は、例えばロードセルとすることができ、ワイヤーロープ6の途中部に設けられたり、図4と図5に示すように、ワイヤーロープ6と吊り部材4との連結部等に設けられる。つまり、吊り部材4が降下し吊荷Wの上面に着床して連結可能所定位置に達すると、ワイヤーロープ6の張力は自重を無視すると0となる。そこで、この荷重センサ7が、その張力の低下を検出することで、吊り部材4が吊荷Wに対して連結可能所定位置に達したことの検出ができる。   The load sensor 7 can be a load cell, for example, and is provided in the middle part of the wire rope 6 or, as shown in FIGS. 4 and 5, is provided at a connection part between the wire rope 6 and the suspension member 4. That is, when the suspension member 4 descends, reaches the upper surface of the suspended load W and reaches a predetermined position where it can be connected, the tension of the wire rope 6 becomes 0 when its own weight is ignored. Therefore, the load sensor 7 can detect that the suspension member 4 has reached a predetermined position where it can be connected to the suspended load W by detecting a decrease in the tension.

つまり、図4において、吊り部材4が降下動作中は、カウンタバランス弁1が開状態であり、バイパス流路2の開閉切換弁3は閉状態であり、矢印の方向に作動油が閉回路内を循環している。そして、図5のように、吊り部材4が吊荷Wに着床して連結可能所定位置に達すると、ワイヤーロープ6の張力が低下し、荷重センサ7の検知と制御手段8の働きにより開閉切換弁3を開状態とさせる。これにより、図5の矢印g,h,i,jのように作動油がバイパス流路2を流れ、第2流路B側の油圧モータ13への流入圧(内圧)が低下し(カウンタバランス弁1において閉開切り換わる設定圧力未満に低下し)、カウンタバランス弁1が瞬時に閉じ、油圧モータ13が直ちに停止する。   That is, in FIG. 4, while the suspension member 4 is descending, the counter balance valve 1 is open, the open / close switching valve 3 of the bypass flow path 2 is closed, and hydraulic oil is in the closed circuit in the direction of the arrow. Is circulating. Then, as shown in FIG. 5, when the suspension member 4 reaches the suspended load W and reaches a predetermined position where it can be connected, the tension of the wire rope 6 decreases and opens and closes by the detection of the load sensor 7 and the action of the control means 8. The switching valve 3 is opened. As a result, the hydraulic oil flows through the bypass flow path 2 as indicated by arrows g, h, i, and j in FIG. 5, and the inflow pressure (internal pressure) to the hydraulic motor 13 on the second flow path B side decreases (counter balance). The pressure drops below the set pressure at which the valve 1 is closed and opened), the counter balance valve 1 is instantly closed, and the hydraulic motor 13 is immediately stopped.

次に、図8は、油圧式昇降装置の油圧式アクチュエータMについての他の実施の形態を示す概略構成図であり、この油圧式アクチュエータMは鉛直方向向きの油圧シリンダ14とされ、第1流路Aがロッド側17に接続され、第2流路Bがヘッド側18に接続される。そして、この実施の形態においても、油圧シリンダ14による降下動作を停止すべき停止信号が入力された際に、第1流路Aと第2流路Bとを連通状態とする開閉切換弁3を有するバイパス流路2が、カウンタバランス弁1よりも油圧ポンプP側に設けられている。なお、その他の構成は、図1と同じであり説明を省略する。   Next, FIG. 8 is a schematic configuration diagram showing another embodiment of the hydraulic actuator M of the hydraulic lifting device. The hydraulic actuator M is a hydraulic cylinder 14 oriented in the vertical direction, and the first flow The path A is connected to the rod side 17 and the second flow path B is connected to the head side 18. In this embodiment as well, the open / close switching valve 3 that brings the first flow path A and the second flow path B into communication when a stop signal for stopping the descent operation by the hydraulic cylinder 14 is input. The bypass flow path 2 is provided on the hydraulic pump P side with respect to the counter balance valve 1. The other configurations are the same as those in FIG.

以上のように、本発明によれば、可変容量油圧ポンプPと、油圧ポンプPに第1流路A及び第2流路Bを介して接続された油圧式アクチュエータMと、第1流路A側に設けられ第2流路B側の内圧をパイロット圧とするカウンタバランス弁1と、を備えた油圧式昇降装置に於て、油圧式アクチュエータMによる降下動作を停止すべき停止信号が入力された際に第1流路Aと第2流路Bとを連通状態とする開閉切換弁3を有するバイパス流路2が、カウンタバランス弁1よりも油圧ポンプP側に設けられたものであるため、油圧式アクチュエータMの降下動作の停止の応答性が優れ、直ちに所定位置に停止できる。   As described above, according to the present invention, the variable displacement hydraulic pump P, the hydraulic actuator M connected to the hydraulic pump P via the first flow path A and the second flow path B, and the first flow path A A stop signal for stopping the descent operation by the hydraulic actuator M is input to the hydraulic lift device provided with the counter balance valve 1 provided on the side and using the internal pressure on the second flow path B side as the pilot pressure. Since the bypass flow path 2 having the open / close switching valve 3 that brings the first flow path A and the second flow path B into communication with each other is provided closer to the hydraulic pump P than the counter balance valve 1. The responsiveness of stopping the descent operation of the hydraulic actuator M is excellent, and can be stopped immediately at a predetermined position.

つまり、降下動作を停止すべき停止信号にて(停止信号と同時に)バイパス流路2の開閉切換弁3を開けることで、第2流路B側から油圧式アクチュエータMへの流入圧(内圧)が瞬時に下がるため、カウンタバランス弁1が直ぐに閉じ、油圧式アクチュエータMを直ちに停止させることができる。従って、油圧式アクチュエータMが油圧モータ13である場合、油圧モータ13に接続されるドラム5の回転を瞬時に停止させることができ、巻き下げ過ぎによるワイヤーロープ6のたるみを防ぐことができる。   That is, by opening the open / close switching valve 3 of the bypass flow path 2 with a stop signal to stop the descent operation (simultaneously with the stop signal), the inflow pressure (internal pressure) from the second flow path B side to the hydraulic actuator M Therefore, the counter balance valve 1 is immediately closed and the hydraulic actuator M can be stopped immediately. Therefore, when the hydraulic actuator M is the hydraulic motor 13, the rotation of the drum 5 connected to the hydraulic motor 13 can be instantaneously stopped, and the slack of the wire rope 6 due to excessive winding can be prevented.

また、油圧式アクチュエータMは、吊荷Wを吊り持ちする昇降自在な吊り部材4と接続され、吊り部材4が降下して吊荷Wに対して連結可能所定位置に達すると停止信号を発信させる制御手段8を備えたものであるため、降下動作にある油圧式アクチュエータMを吊荷Wに対して連結可能な所定位置に(正確に)自動停止させることができ、迅速かつ確実に吊荷Wを吊り持ちさせることができる。   The hydraulic actuator M is connected to a lifting member 4 that can lift and lower the suspended load W. When the hanging member 4 descends and reaches a predetermined position where it can be connected to the suspended load W, a stop signal is transmitted. Since the control means 8 is provided, the hydraulic actuator M in the descending operation can be automatically stopped (accurately) at a predetermined position where it can be connected to the suspended load W, and the suspended load W can be quickly and reliably. Can be suspended.

また、油圧式アクチュエータMは、吊荷Wを吊り持ちする昇降自在な吊り部材4と接続され、吊り部材4と吊荷Wとの距離を検知して連結可能接近状態を検出する位置センサ9と、位置センサ9による検出信号にて停止信号を発信させる制御手段8と、を有するため、降下動作にある油圧式アクチュエータMを吊荷Wに対して連結可能な所定位置に(高精度に)自動停止させることができ、迅速かつ確実に吊荷Wを吊り持ちさせることができる。   The hydraulic actuator M is connected to a lifting member 4 that lifts and lowers a suspended load W, detects a distance between the hanging member 4 and the suspended load W, and detects a connectable approach state; And a control means 8 for transmitting a stop signal in response to a detection signal from the position sensor 9, so that the hydraulic actuator M in the descending motion is automatically (highly accurate) at a predetermined position where it can be connected to the suspended load W. The suspended load W can be suspended quickly and reliably.

また、油圧式アクチュエータMは油圧モータとされ、油圧モータは、吊荷Wを吊り持ちする吊り部材4を昇降自在とさせるワイヤーロープ用ドラム5と接続され、吊り部材4と接続されるワイヤーロープ6の張力の低下を検出する荷重センサ7と、荷重センサ7の検出信号にて停止信号を発信させる制御手段8と、を有するため、降下動作にある油圧式アクチュエータMを吊荷Wに対して連結可能な所定位置に(正確に)自動停止させることができ、迅速かつ確実に吊荷Wを吊り持ちさせることができる。
さらに、吊り部材4に吊荷Wを吊り持ちさせた状態で、その吊荷Wを地上や他のコンテナ等の上に載置させた場合においても、油圧式アクチュエータMを自動停止させることが可能となる。
The hydraulic actuator M is a hydraulic motor, and the hydraulic motor is connected to a wire rope drum 5 that allows the suspension member 4 that holds the suspended load W to be lifted and lowered, and the wire rope 6 that is connected to the suspension member 4. Since the load sensor 7 for detecting a drop in the tension of the load and the control means 8 for transmitting a stop signal by the detection signal of the load sensor 7, the hydraulic actuator M in the descending operation is connected to the suspended load W. It is possible to automatically (accurately) stop at a predetermined position where possible, and to suspend the suspended load W quickly and reliably.
Furthermore, the hydraulic actuator M can be automatically stopped even when the suspended load W is placed on the ground or another container with the suspended load W suspended on the suspension member 4. It becomes.

本発明に係る油圧式昇降装置の実施の一形態を示す概略構成図である。1 is a schematic configuration diagram showing an embodiment of a hydraulic lifting device according to the present invention. 油圧式アクチュエータが降下動作状態にある概略構成図である。It is a schematic block diagram in which a hydraulic actuator is in a descending operation state. 油圧式アクチュエータが降下停止状態にある概略構成図である。It is a schematic block diagram in which a hydraulic actuator is in a descent stop state. 油圧式アクチュエータが降下動作状態にある他の実施の形態を示す概略構成図である。It is a schematic block diagram which shows other embodiment in which a hydraulic actuator is in a descent | fall operation | movement state. 油圧式アクチュエータが降下停止状態にある他の実施の形態を示す概略構成図である。It is a schematic block diagram which shows other embodiment in which a hydraulic actuator is in a descent stop state. 停止信号を発信させる制御手段の別の実施の形態を示す説明図である。It is explanatory drawing which shows another embodiment of the control means which transmits a stop signal. バイパス流路の他の実施の形態を示す部分構成図である。It is a partial block diagram which shows other embodiment of a bypass flow path. 本発明に係る油圧式昇降装置の他の実施の形態を示す概略構成図である。It is a schematic block diagram which shows other embodiment of the hydraulic lifting apparatus which concerns on this invention.

符号の説明Explanation of symbols

1 カウンタバランス弁
2 バイパス流路
3 開閉切換弁
4 吊り部材
5 ドラム
6 ワイヤーロープ
7 荷重センサ
8 制御手段
9 位置センサ
A 第1流路
B 第2流路
M 油圧式アクチュエータ
P 油圧ポンプ
W 吊荷
DESCRIPTION OF SYMBOLS 1 Counter balance valve 2 Bypass flow path 3 Open / close switching valve 4 Hanging member 5 Drum 6 Wire rope 7 Load sensor 8 Control means 9 Position sensor A 1st flow path B 2nd flow path M Hydraulic actuator P Hydraulic pump W Suspended load

Claims (4)

可変容量油圧ポンプ(P)と、該油圧ポンプ(P)に第1流路(A)及び第2流路(B)を介して接続された油圧式アクチュエータ(M)と、該第1流路(A)側に設けられ該第2流路(B)側の内圧をパイロット圧とするカウンタバランス弁(1)と、を備えた油圧式昇降装置に於て、上記油圧式アクチュエータ(M)による降下動作を停止すべき停止信号が入力された際に上記第1流路(A)と上記第2流路(B)とを連通状態とする開閉切換弁(3)を有するバイパス流路(2)が、上記カウンタバランス弁(1)よりも上記油圧ポンプ(P)側に設けられたことを特徴とする油圧式昇降装置。   A variable displacement hydraulic pump (P), a hydraulic actuator (M) connected to the hydraulic pump (P) via a first flow path (A) and a second flow path (B), and the first flow path In a hydraulic lifting apparatus provided with a counter balance valve (1) provided on the (A) side and having an internal pressure on the second flow path (B) side as a pilot pressure, the hydraulic actuator (M) Bypass flow path (2) having an open / close switching valve (3) that brings the first flow path (A) and the second flow path (B) into communication when a stop signal for stopping the descent operation is input. ) Is provided closer to the hydraulic pump (P) than the counter balance valve (1). 上記油圧式アクチュエータ(M)は、吊荷(W)を吊り持ちする昇降自在な吊り部材(4)と接続され、該吊り部材(4)が降下して該吊荷(W)に対して連結可能所定位置に達すると上記停止信号を発信させる制御手段(8)を備えた請求項1記載の油圧式昇降装置。   The hydraulic actuator (M) is connected to a lifting member (4) that can lift and lower a suspended load (W), and the hanging member (4) is lowered to be coupled to the suspended load (W). 2. The hydraulic lifting apparatus according to claim 1, further comprising a control means (8) for transmitting the stop signal when the predetermined position is reached. 上記油圧式アクチュエータ(M)は、吊荷(W)を吊り持ちする昇降自在な吊り部材(4)と接続され、該吊り部材(4)と該吊荷(W)との距離を検知して連結可能接近状態を検出する位置センサ(9)と、該位置センサ(9)による検出信号にて上記停止信号を発信させる制御手段(8)と、を有する請求項1記載の油圧式昇降装置。   The hydraulic actuator (M) is connected to a lifting member (4) that can lift and lower a suspended load (W), and detects the distance between the hanging member (4) and the suspended load (W). The hydraulic lifting device according to claim 1, further comprising: a position sensor (9) for detecting a connectable approach state; and a control means (8) for transmitting the stop signal by a detection signal from the position sensor (9). 上記油圧式アクチュエータ(M)は油圧モータとされ、該油圧モータは、吊荷(W)を吊り持ちする吊り部材(4)を昇降自在とさせるワイヤーロープ用ドラム(5)と接続され、該吊り部材(4)と接続されるワイヤーロープ(6)の張力の低下を検出する荷重センサ(7)と、該荷重センサ(7)の検出信号にて上記停止信号を発信させる制御手段(8)と、を有する請求項1記載の油圧式昇降装置。   The hydraulic actuator (M) is a hydraulic motor, and the hydraulic motor is connected to a wire rope drum (5) that allows a hanging member (4) that holds a suspended load (W) to be lifted and lowered. A load sensor (7) for detecting a decrease in tension of the wire rope (6) connected to the member (4), and a control means (8) for transmitting the stop signal by a detection signal of the load sensor (7); The hydraulic lifting device according to claim 1.
JP2004123878A 2004-04-20 2004-04-20 Hydraulic lifting device Expired - Fee Related JP4425047B2 (en)

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