JP2007155074A - Lifting hydraulic drive mechanism - Google Patents

Lifting hydraulic drive mechanism Download PDF

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JP2007155074A
JP2007155074A JP2005354195A JP2005354195A JP2007155074A JP 2007155074 A JP2007155074 A JP 2007155074A JP 2005354195 A JP2005354195 A JP 2005354195A JP 2005354195 A JP2005354195 A JP 2005354195A JP 2007155074 A JP2007155074 A JP 2007155074A
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hydraulic
oil
circuit
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JP4693612B2 (en
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Masami Higaki
正美 檜垣
Katsutoshi Fujikura
勝利 藤倉
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TCM Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a lifting hydraulic drive mechanism for stopping a hydraulic motor when the pressure of operating oil drops during driving a cargo lift with the hydraulic motor arranged in a closed hydraulic circuit. <P>SOLUTION: The lifting hydraulic drive mechanism comprises the hydraulic motor 2 for driving the drum of a winch device which introduces operating oil from a hydraulic pump 1 to lift up and down a container, the closed hydraulic circuit 3 having a counterbalance valve 13 for circulating the operating oil to the pump and the motor to operate back pressure during lifting-down operation of the container, an oil circuit 5 for circulating the operating oil between the closed hydraulic circuit and an oil tank 4, a brake operating circuit 7 for supplying the operating oil from the oil circuit to a brake part 6 of the hydraulic motor, and a pressure sensor 51 provided in an oil intake pipe 23 for detecting hydraulic pressure in the closed hydraulic circuit. When inputting pressure detected by the pressure sensor, if it is lower than a set value, a control part operates a solenoid on-off valve 42 to supply the operating oil to the brake part and constrain the rotation of the hydraulic motor. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、例えば荷物を昇降させる昇降機を駆動するための昇降用油圧駆動装置に関するものである。   The present invention relates to an elevating hydraulic drive device for driving, for example, an elevator that elevates and lowers a load.

産業車両の中には、コンテナを搬送するコンテナキャリアがあるが、例えばこのコンテナキャリアには、コンテナを保持するためのスプレッダおよびこのスプレッダを昇降させるウインチ装置が設けられており、またこのウインチ装置の駆動源としては油圧が用いられている。   Among industrial vehicles, there is a container carrier for transporting a container. For example, the container carrier is provided with a spreader for holding the container and a winch device for raising and lowering the spreader. Hydraulic pressure is used as a drive source.

このウインチ装置を駆動するための油圧駆動装置を簡単に説明すると、この油圧駆動装置は、エンジンにより駆動される油圧ポンプと、ウインチ装置のワイヤ巻取り用のドラムを回転させる油圧モータと、これら油圧ポンプと油圧モータとの間で作動油を循環させる閉油圧回路とが具備されている。   The hydraulic drive device for driving the winch device will be briefly described. The hydraulic drive device includes a hydraulic pump driven by the engine, a hydraulic motor for rotating a wire winding drum of the winch device, and the hydraulic pressure. A closed hydraulic circuit that circulates hydraulic oil between the pump and the hydraulic motor is provided.

そして、この閉油圧回路には、少なくとも、油圧ポンプに設けられた一対のポートと油圧モータに設けられた一対のポートとを接続する油圧配管が具備されており、またコンテナの下降動作時に低圧側となる油圧配管の途中にカウンタバランス弁が設けられて、コンテナの落下防止が図られている（例えば、特許文献１参照）。
特開２００５−３０６５３８ The closed hydraulic circuit is provided with at least a hydraulic pipe connecting a pair of ports provided in the hydraulic pump and a pair of ports provided in the hydraulic motor. A counter balance valve is provided in the middle of the hydraulic pipe to prevent the container from dropping (for example, see Patent Document 1).
JP 2005-306538 A

ところで、ウインチ装置のドラムを回転させる油圧モータとして、アキシャルピストン式のものが用いられている。
このアキシャルピストン式の油圧モータにおいては、中央に空間部が形成されるとともに端壁部に高圧油ポートおよび低圧油ポートが形成されたポンプケーシングと、このポンプケーシングの空間部内に回転自在に配置されて回転出力軸部の周囲に複数のシリンダ室が形成され且つ当該各シリンダ室にピストンが配置されてなるシリンダブロックとが具備され、さらにこのシリンダブロック側には端壁部側に形成された高圧油ポートおよび低圧油ポートを回転するシリンダ室内に連通させるためのバルブプレートが固定されるとともに、このバルブプレートに対向する端壁部側にはベアリングプレートが配置されて、当該モータに供給される作動油が両プレート間に充満されることにより流体軸受を形成して、シリンダブロックがスムースに回転し得るようにされている。 Incidentally, an axial piston type motor is used as a hydraulic motor for rotating the drum of the winch device.
In this axial piston type hydraulic motor, a space is formed at the center and a pump casing having a high-pressure oil port and a low-pressure oil port formed at an end wall, and the pump casing is rotatably disposed in the space of the pump casing. And a cylinder block in which a plurality of cylinder chambers are formed around the rotation output shaft portion and a piston is arranged in each cylinder chamber, and a high pressure formed on the end wall portion side on the cylinder block side. A valve plate for communicating the oil port and the low-pressure oil port with the rotating cylinder chamber is fixed, and a bearing plate is disposed on the end wall portion facing the valve plate, and the operation is supplied to the motor. Oil is filled between both plates to form a hydrodynamic bearing, making the cylinder block smooth It is adapted to be translocated.

しかし、油圧モータに供給される作動油の圧力が何らかの原因で低下した場合には、両プレート同士間での流体軸受作用が十分に働かず、油圧モータの回転機能が低下する。そのため、油圧モータ内ではキャビテーションが発生し、特に、コンテナの下降動作時においては、カウンタバランス弁の機能が十分に発揮されず、したがって荷物の下降速度が上昇する場合が生じる。   However, when the pressure of the hydraulic oil supplied to the hydraulic motor decreases for some reason, the fluid bearing action between the plates does not work sufficiently, and the rotation function of the hydraulic motor decreases. For this reason, cavitation occurs in the hydraulic motor, and in particular, when the container is lowered, the function of the counter balance valve is not fully exhibited, and therefore the load lowering speed may increase.

そこで、本発明は、閉油圧回路に配置された油圧モータにより荷物の昇降機を駆動させる際、作動油の圧力が低下した場合に、油圧モータを停止させて荷物の下降速度の上昇を防止し得る昇降用油圧駆動装置を提供することを目的とする。   Therefore, the present invention can prevent an increase in the lowering speed of the load by stopping the hydraulic motor when the hydraulic oil pressure is lowered when the lift of the load is driven by the hydraulic motor arranged in the closed hydraulic circuit. It is an object of the present invention to provide a lifting / lowering hydraulic drive device.

上記課題を解決するため、本発明の請求項１に係る昇降式油圧駆動装置は、油圧ポンプと、この油圧ポンプからの作動油を導き荷物の昇降機を駆動する油圧モータと、これら油圧ポンプと油圧モータとの間で設けられた油圧配管により作動油を循環させるとともに上記昇降機の下降動作時に背圧を作用させるカウンタバランス弁が設けられた閉油圧回路と、この閉油圧回路と油タンクとの間で作動油を循環させる油循環回路と、この油循環回路の作動油を油圧モータに設けられたブレーキ部に作動用として供給するブレーキ作動回路と、上記閉油圧回路内の油圧を検出する圧力センサとを具備し、
上記ブレーキ作動回路を、油循環回路内の作動油をブレーキ部に供給する油供給管と、この油供給管の途中に設けられた電磁開閉弁とから構成し、
且つ上記圧力センサからの検出圧力を入力するとともに当該検出圧力が設定値より低い場合に上記電磁開閉弁を作動させてブレーキ部に作動油を供給し得る制御部を設けたものである。 In order to solve the above problems, a lift hydraulic drive apparatus according to claim 1 of the present invention includes a hydraulic pump, a hydraulic motor that guides hydraulic oil from the hydraulic pump and drives a lift of the load, and these hydraulic pump and hydraulic pressure Between the closed hydraulic circuit and the oil tank, a closed hydraulic circuit provided with a counter balance valve that circulates hydraulic oil through a hydraulic pipe provided between the motor and applies a back pressure when the elevator is lowered. An oil circulation circuit that circulates the hydraulic oil at a pressure, a brake operation circuit that supplies the hydraulic oil in the oil circulation circuit to a brake unit provided in the hydraulic motor for operation, and a pressure sensor that detects the oil pressure in the closed hydraulic circuit And
The brake operation circuit comprises an oil supply pipe that supplies hydraulic oil in the oil circulation circuit to the brake unit, and an electromagnetic on-off valve provided in the middle of the oil supply pipe.
In addition, a control unit is provided that inputs the detected pressure from the pressure sensor and can operate the electromagnetic on-off valve to supply hydraulic oil to the brake unit when the detected pressure is lower than a set value.

また、請求項２に係る昇降用油圧駆動装置は、請求項１に記載の油圧駆動装置における油循環回路を、油循環回路を、油タンクから作動油を閉油圧回路内に取り込む油取込回路と、閉油圧回路から作動油を油タンクに取り出す油取出回路とから構成し、
上記油取込回路を、油タンクから作動油を吸い込む油吸込用油圧ポンプと、この油吸込用油圧ポンプにて吸い込まれた作動油を閉油圧回路内に取り込む油取込管とから構成し、
且つ圧力センサを上記油取込管の途中に設けたものである。 According to a second aspect of the present invention, an ascending / descending hydraulic drive device includes an oil circulation circuit in the hydraulic drive device according to claim 1, an oil circulation circuit, and an oil intake circuit that takes in hydraulic oil from an oil tank into a closed hydraulic circuit. And an oil extraction circuit that extracts hydraulic oil from the closed hydraulic circuit to the oil tank,
The oil intake circuit is composed of an oil suction hydraulic pump that sucks hydraulic oil from an oil tank, and an oil intake pipe that takes the hydraulic oil sucked by the oil suction hydraulic pump into a closed hydraulic circuit,
In addition, a pressure sensor is provided in the middle of the oil intake pipe.

上記昇降用油圧駆動装置の構成によると、閉油圧回路内の作動油の圧力が圧力センサにより検出されており、その検出圧力が制御部にて設定値より低下していると判断された場合に、ブレーキ作動回路の電磁開閉弁を介して油圧モータに設けられたブレーキ部が作動されて昇降機が停止されるため、荷物の下降速度が上昇するのを防止することができる。   According to the configuration of the lifting hydraulic drive device described above, when the hydraulic pressure in the closed hydraulic circuit is detected by the pressure sensor, and the detected pressure is determined to be lower than the set value by the control unit Since the brake unit provided in the hydraulic motor is operated via the electromagnetic on-off valve of the brake operation circuit and the elevator is stopped, it is possible to prevent the descent speed of the load from increasing.

［実施の形態］
以下、本発明の実施の形態に係る昇降用油圧駆動装置について説明する。
本実施の形態においては、コンテナの積み下ろしを行うためのコンテナキャリアに設けられてコンテナを吊持し得るスプレッダ装置の油圧駆動装置として説明する。 [Embodiment]
Hereinafter, a lifting and lowering hydraulic drive device according to an embodiment of the present invention will be described.
In the present embodiment, a description will be given of a hydraulic drive device of a spreader device that is provided on a container carrier for loading and unloading a container and can suspend the container.

上記スプレッダ装置には、コンテナ（荷物の一例である）を保持する枠状の保持部材が設けられるととともに、コンテナキャリア側には上記保持部材をワイヤを介して昇降させる（巻き上げおよび巻き下げする）ためのウインチ装置（昇降機の一例）が設けられており、本実施の形態に係る油圧駆動装置は、そのウインチ装置のドラムを回転させるためのものである。   The spreader device is provided with a frame-shaped holding member that holds a container (which is an example of a load), and the holding member is moved up and down (wound up and down) via a wire on the container carrier side. A winch device (an example of an elevator) is provided, and the hydraulic drive device according to the present embodiment is for rotating the drum of the winch device.

この昇降用油圧駆動装置は、図１に示すように、概略的には、エンジン（図示せず）により正逆回転される油圧ポンプ１と、この油圧ポンプ１から供給される作動油を導き上記ドラムを正逆回転させるためのアキシャルピストン式の油圧モータ２と、これら油圧ポンプ１と油圧モータ２との間で作動油を循環させる閉油圧回路３と、油タンク４と上記閉油圧回路３との間で作動油を循環させて当該閉油圧回路３内に作動油を取り込むとともに閉油圧回路３内の作動油を油タンク４内に取り出し冷却するための油循環回路（チャージ回路ともいう）５と、この油循環回路５内の作動油を油圧モータ２に設けられた油圧式ブレーキ部６に供給するためのブレーキ作動回路７とが具備されている。   As shown in FIG. 1, the lifting / lowering hydraulic drive apparatus schematically guides the hydraulic pump 1 rotated forward and backward by an engine (not shown) and the hydraulic oil supplied from the hydraulic pump 1. An axial piston type hydraulic motor 2 for rotating the drum forward and backward, a closed hydraulic circuit 3 for circulating hydraulic oil between the hydraulic pump 1 and the hydraulic motor 2, an oil tank 4, and the closed hydraulic circuit 3 An oil circulation circuit (also referred to as a charge circuit) 5 is used to circulate the hydraulic oil between the two and take in the hydraulic oil into the closed hydraulic circuit 3 and take out the hydraulic oil in the closed hydraulic circuit 3 into the oil tank 4 and cool it. And a brake operating circuit 7 for supplying hydraulic oil in the oil circulation circuit 5 to a hydraulic brake unit 6 provided in the hydraulic motor 2.

上記閉油圧回路３には、上記油圧ポンプ１の一方の油ポートと油圧モータ２の一方の油ポートとを接続するとともにコンテナを上昇させる際に高圧の作動油を供給するための第１油圧配管１１と、同じく油圧ポンプ１の他方の油ポートと油圧モータ２の他方の油ポートとを接続するとともにコンテナを下降させる際に高圧の作動油を供給するための第２油圧配管１２と、上記第１油圧配管１１途中に設けられたカウンタバランス弁１３と、上記両油圧配管１１，１２同士を接続するとともに途中に電磁開閉弁１４を有して上記カウンタバランス弁１３および油圧モータ２をバイパスするように設けられたバイパス管１５とが具備されている。   The closed hydraulic circuit 3 is connected to one oil port of the hydraulic pump 1 and one oil port of the hydraulic motor 2 and supplies a high-pressure hydraulic oil when the container is raised. 11, a second hydraulic pipe 12 for connecting the other oil port of the hydraulic pump 1 and the other oil port of the hydraulic motor 2 and supplying high-pressure hydraulic oil when the container is lowered, A counter balance valve 13 provided in the middle of one hydraulic pipe 11 and the hydraulic pipes 11 and 12 are connected to each other, and an electromagnetic on-off valve 14 is provided in the middle to bypass the counter balance valve 13 and the hydraulic motor 2. And a bypass pipe 15 provided in the.

また、上記油循環回路５は、上記油タンク４の作動油を閉油圧回路３内に取り込むための油取込回路５ａと、閉油圧回路３から作動油を油タンク４に取り出すための油取出回路５ｂとから構成されている。   The oil circulation circuit 5 includes an oil intake circuit 5a for taking the hydraulic oil from the oil tank 4 into the closed hydraulic circuit 3, and an oil take-out for taking the hydraulic oil from the closed hydraulic circuit 3 to the oil tank 4. And a circuit 5b.

上記油取込回路５ａは、油圧ポンプ１と一緒に駆動されて油タンク４内の作動油を油吸込管２１を介して吸い込むための吸込用油圧ポンプ（チャージポンプともいう）２２と、この吸込用油圧ポンプ２２により吸い込まれた作動油を閉油圧回路３に取り込む（供給）するための油取込管２３およびこの油取込管２３から分岐されて作動油を油圧ポンプ１の両ポートに接続された第１油圧配管１１および第２油圧配管１２に取り込むための第１および第２油分岐取込管２４，２５と、これら各油分岐取込管２４，２５の途中に設けられて各油圧配管１１，１２からの作動油の逆流を防止するための逆止弁２６，２７とから構成されている。なお、上記油取込管２３の途中には、油圧ポンプ１に作動油を潤滑用として供給するための潤滑油供給管２８が接続されている。   The oil intake circuit 5a is driven together with the hydraulic pump 1 to suck in the hydraulic oil in the oil tank 4 through the oil suction pipe 21, and the suction hydraulic pump 22 (also referred to as a charge pump). The oil intake pipe 23 for taking in (supplying) the hydraulic oil sucked in by the hydraulic pump 22 for operation (supply) and the branching from the oil intake pipe 23 connect the hydraulic oil to both ports of the hydraulic pump 1 The first and second oil branch intake pipes 24 and 25 for taking in the first hydraulic pipe 11 and the second hydraulic pipe 12, and the oil pressure provided in the middle of each of the oil branch intake pipes 24 and 25. It consists of check valves 26 and 27 for preventing the backflow of hydraulic oil from the pipes 11 and 12. A lubricating oil supply pipe 28 for supplying hydraulic oil to the hydraulic pump 1 for lubrication is connected in the middle of the oil intake pipe 23.

上記油取出回路５ｂは、一端部が各油圧配管１１，１２に接続されるとともに他端部が油取出弁（フラッシングバルブともいう）３１の各入口側ポートに接続された第１および第２油取出管３２，３３と、上記油取出弁３１の出口側ポートと上記閉油圧回路３に設けられたドレン配管１６とを接続する油取出用接続管３４とから構成されている。   The oil take-out circuit 5b includes first and second oils having one end connected to the hydraulic pipes 11 and 12 and the other end connected to each inlet-side port of an oil take-off valve (also referred to as a flushing valve) 31. It is comprised from the extraction pipes 32 and 33 and the oil extraction connecting pipe 34 which connects the outlet side port of the oil extraction valve 31 and the drain pipe 16 provided in the closed hydraulic circuit 3.

上記ブレーキ作動回路７は、一端部が上記油取込管２３の途中に接続されるとともに他端部が油圧式ブレーキ部６に接続された油供給管４１と、この油供給管４１の途中に設けられた電磁開閉弁４２と、この電磁開閉弁４２より上流側に接続されたアキュムレータ４３とから構成されている。   The brake operating circuit 7 includes an oil supply pipe 41 having one end connected in the middle of the oil intake pipe 23 and the other end connected to the hydraulic brake section 6, and in the middle of the oil supply pipe 41. The electromagnetic on-off valve 42 is provided, and an accumulator 43 connected to the upstream side of the electromagnetic on-off valve 42.

さらに、上記油取込管２３の途中には、圧力センサ５１が設けられ、またこの圧力センサ５１からの検出圧力（例えば、電気信号である）を入力して当該検出圧力が所定の設定値（例えば、１ＭＰ程度）以下になった場合に、上記電磁開閉弁４２に作動信号を出力して油圧式ブレーキ部６を作動させるとともに警報器（例えば、警告音発生器、警告灯など）５２にも作動信号を出力する制御部５３が具備されている。   Further, a pressure sensor 51 is provided in the middle of the oil intake pipe 23, and a detected pressure (for example, an electric signal) is input from the pressure sensor 51, and the detected pressure is set to a predetermined set value ( (For example, about 1 MP) or less, an operation signal is output to the electromagnetic on-off valve 42 to operate the hydraulic brake unit 6 and to an alarm device (for example, a warning sound generator, a warning light) 52 A control unit 53 that outputs an operation signal is provided.

上記構成において、例えばコンテナを上昇させる場合には、第１油圧配管１１より油圧モータ２に圧油を供給し、ウインチ装置のドラムを巻き上げ方向に回転させればよい。また、逆に、コンテナを下降させる場合には、第２油圧配管１２より油圧モータ２に圧油を供給し、ウインチ装置のドラムを巻き下げ方向に回転させればよい。勿論、この下降動作時には、低圧側の第１油圧配管１１途中に設けられたカウンタバランス弁１３により背圧が発生されて、コンテナの下降速度が制限されている。   In the above configuration, for example, when the container is raised, pressure oil is supplied from the first hydraulic pipe 11 to the hydraulic motor 2 and the drum of the winch device is rotated in the winding direction. On the other hand, when the container is lowered, pressure oil is supplied from the second hydraulic pipe 12 to the hydraulic motor 2 and the drum of the winch device is rotated in the lowering direction. Of course, during this lowering operation, back pressure is generated by the counter balance valve 13 provided in the middle of the first hydraulic pipe 11 on the low pressure side, and the lowering speed of the container is limited.

また、油圧ポンプ１が駆動されているときには、当然、吸込用油圧ポンプ２２も駆動されて、油タンク４内の作動油が閉油圧回路３内に取り込まれるとともに、油取出弁３１、油取出管３２（または３３）、油取出用接続管３４およびドレン配管１６を介して油タンク４内に戻されて冷却が行われている。   Further, when the hydraulic pump 1 is driven, the suction hydraulic pump 22 is also driven, so that the hydraulic oil in the oil tank 4 is taken into the closed hydraulic circuit 3, and the oil take-off valve 31 and the oil take-out pipe are also taken. 32 (or 33), the oil extraction connecting pipe 34 and the drain pipe 16 are returned to the oil tank 4 for cooling.

なお、上記油取出弁３１については、両油圧配管１１，１２内の作動油の圧力が入力されて、その圧力差により作動するもので、具体的には、圧力が低い油圧配管側に接続されてその低い方の作動油が油タンク４側に戻るようにされている。   The oil take-off valve 31 is operated by the pressure difference between the hydraulic oils in both the hydraulic pipes 11 and 12, and is connected to the hydraulic pipe side where the pressure is low. The lower hydraulic oil returns to the oil tank 4 side.

そして、油圧ポンプ１の駆動時においては、閉油圧回路３内の作動油の圧力が、油取込回路５ａの油取込管２３側に設けられた圧力センサ５１により、常時、検出されるとともに、この検出圧力が制御部５３に入力されており、例えばその圧力が設定値より低下した場合には、制御部５３から、ブレーキ作動回路７の電磁開閉弁４２に作動信号が出力されて、油圧モータ２の回転、すなわちドラムが拘束される。   When the hydraulic pump 1 is driven, the pressure of the hydraulic oil in the closed hydraulic circuit 3 is always detected by the pressure sensor 51 provided on the oil intake pipe 23 side of the oil intake circuit 5a. The detected pressure is input to the control unit 53. For example, when the pressure falls below a set value, an operation signal is output from the control unit 53 to the electromagnetic on-off valve 42 of the brake operation circuit 7, and the hydraulic pressure is The rotation of the motor 2, that is, the drum is restrained.

したがって、コンテナを下降させている際に、何らかの原因で作動油の圧力が低下した場合、油圧モータ２にて発生するキャビテーションに起因する下降速度の上昇などの不都合を防止することができる。   Therefore, when the hydraulic oil pressure decreases for some reason while the container is being lowered, inconveniences such as an increase in the lowering speed due to cavitation generated in the hydraulic motor 2 can be prevented.

そして、これと同時に、制御部５３からの信号により、警報器５２が作動されて、作動油の圧力の異常低下が作業者に知らされる。
このように、閉油圧回路内の作動油の圧力が油取込管２３側に設けられた圧力センサ５１を介して検出されており、その検出圧力が制御部５３にて、設定値より低下していると判断された場合に、制御部５３からブレーキ作動回路７の電磁開閉弁４２が作動され油圧モータ２に設けられた油圧式ブレーキ部６が作動されて、ウインチ装置の巻取りドラムが固定されるので、例えばコンテナの下降動作中に作動油の圧力低下が生じても、コンテナのそれ以上の下降を防止することができ安全である。 At the same time, the alarm 52 is actuated by a signal from the control unit 53, and the operator is notified of an abnormal drop in the pressure of the hydraulic oil.
As described above, the pressure of the hydraulic oil in the closed hydraulic circuit is detected via the pressure sensor 51 provided on the oil intake pipe 23 side, and the detected pressure is lowered from the set value by the control unit 53. When it is determined that the electromagnetic brake valve 6 of the brake operating circuit 7 is operated from the control unit 53 and the hydraulic brake unit 6 provided in the hydraulic motor 2 is operated, the winding drum of the winch device is fixed. Therefore, for example, even if the hydraulic oil pressure drops during the lowering operation of the container, the container can be prevented from further lowering and it is safe.

ところで、上記実施の形態においては、閉油圧回路３内の作動油の圧力を検出する圧力センサ５１を、油取込回路５ａの油取込管２３側に設けるように説明したが、これは、通常の閉油圧回路３内での圧力は３０ＭＰａ程度であるのに対して、設定圧力値が１ＭＰａ程度であり、３０ＭＰａの圧力に耐え得るとともに１ＭＰａ程度の圧力を検出し得る圧力センサを得るのが困難であるため、圧力が２〜３ＭＰａ程度である油取込回路５ａに圧力センサ５１を配置したものである。すなわち、油取込回路５ａを介して閉油圧回路３内の圧力を感度良く検出するようにしたものである。   By the way, in the said embodiment, although the pressure sensor 51 which detects the pressure of the hydraulic fluid in the closed hydraulic circuit 3 was demonstrated so that it might provide in the oil intake pipe 23 side of the oil intake circuit 5a, this is, While the pressure in the normal closed hydraulic circuit 3 is about 30 MPa, the set pressure value is about 1 MPa, and a pressure sensor capable of withstanding a pressure of 30 MPa and detecting a pressure of about 1 MPa is obtained. Since it is difficult, the pressure sensor 51 is arranged in the oil intake circuit 5a having a pressure of about 2 to 3 MPa. That is, the pressure in the closed hydraulic circuit 3 is detected with high sensitivity via the oil intake circuit 5a.

勿論、３０ＭＰａの圧力に耐え得るとともに１ＭＰａ程度の圧力を検出し得る（感度を有する）圧力センサがあれば、閉油圧回路３内に直接に設けることもできる。
また、上記実施の形態においては、コンテナのスプレッダ装置の昇降機としてのウインチ装置を駆動するものとして説明したが、このものに限定されるものでもなく、物体を昇降させる他の油圧式駆動装置にも適用することができる。 Of course, if there is a pressure sensor that can withstand a pressure of 30 MPa and can detect a pressure of about 1 MPa (has sensitivity), it can be provided directly in the closed hydraulic circuit 3.
In the above embodiment, the winch device as the elevator of the container spreader device is driven. However, the present invention is not limited to this, and other hydraulic drive devices for raising and lowering objects are also used. Can be applied.

本発明の実施の形態に係る油圧駆動装置の油圧回路図である。1 is a hydraulic circuit diagram of a hydraulic drive device according to an embodiment of the present invention. 同油圧駆動装置におけるブレーキ作動回路の制御部を示すブロック図である。It is a block diagram which shows the control part of the brake operation circuit in the hydraulic drive unit.

符号の説明Explanation of symbols

１ 油圧ポンプ
２ 油圧モータ
３ 閉油圧回路
４ 油タンク
５ 油循環回路
５ａ 油取込回路
５ｂ 油取出回路
６ 油圧式ブレーキ部
７ ブレーキ作動回路
１１ 第１油圧配管
１２ 第２油圧配管
１３ カウンタバランス弁
２１ 油吸込管
２２ 吸込用油圧ポンプ
２３ 油取込管
２４ 第１油分岐取込管
２５ 第２油分岐取込管
４１ 油供給管
４２ 電磁開閉弁
４３ アキュムレータ
５１ 圧力センサ
５２ 警報器
５３ 制御部
DESCRIPTION OF SYMBOLS 1 Hydraulic pump 2 Hydraulic motor 3 Closed hydraulic circuit 4 Oil tank 5 Oil circulation circuit 5a Oil intake circuit 5b Oil extraction circuit 6 Hydraulic brake part 7 Brake operation circuit 11 1st hydraulic piping 12 2nd hydraulic piping 13 Counter balance valve 21 Oil suction pipe 22 Suction hydraulic pump 23 Oil intake pipe 24 First oil branch intake pipe 25 Second oil branch intake pipe 41 Oil supply pipe 42 Electromagnetic on-off valve 43 Accumulator 51 Pressure sensor 52 Alarm 53 Controller

Claims (2)

油圧ポンプと、この油圧ポンプからの作動油を導き荷物の昇降機を駆動する油圧モータと、これら油圧ポンプと油圧モータとの間で設けられた油圧配管により作動油を循環させるとともに上記昇降機の下降動作時に背圧を作用させるカウンタバランス弁が設けられた閉油圧回路と、この閉油圧回路と油タンクとの間で作動油を循環させる油循環回路と、この油循環回路の作動油を油圧モータに設けられたブレーキ部に作動用として供給するブレーキ作動回路と、上記閉油圧回路内の油圧を検出する圧力センサとを具備し、
上記ブレーキ作動回路を、油循環回路内の作動油をブレーキ部に供給する油供給管と、この油供給管の途中に設けられた電磁開閉弁とから構成し、
且つ上記圧力センサからの検出圧力を入力するとともに当該検出圧力が設定値より低い場合に上記電磁開閉弁を作動させてブレーキ部に作動油を供給し得る制御部を設けたことを特徴とする昇降用油圧駆動装置。 A hydraulic pump, a hydraulic motor that guides the hydraulic oil from the hydraulic pump and drives the elevator of the load, and a hydraulic pipe provided between the hydraulic pump and the hydraulic motor circulates the hydraulic oil and lowers the elevator A closed hydraulic circuit provided with a counter balance valve that sometimes applies back pressure, an oil circulation circuit that circulates hydraulic oil between the closed hydraulic circuit and the oil tank, and hydraulic oil from the oil circulation circuit to the hydraulic motor A brake operation circuit that supplies the brake unit provided for operation, and a pressure sensor that detects the hydraulic pressure in the closed hydraulic circuit,
The brake operation circuit comprises an oil supply pipe that supplies hydraulic oil in the oil circulation circuit to the brake unit, and an electromagnetic on-off valve provided in the middle of the oil supply pipe.
In addition, there is provided a control unit that inputs the detected pressure from the pressure sensor and operates the electromagnetic on-off valve to supply hydraulic oil to the brake unit when the detected pressure is lower than a set value. Hydraulic drive device. 油循環回路を、油タンクから作動油を閉油圧回路内に取り込む油取込回路と、閉油圧回路から作動油を油タンクに取り出す油取出回路とから構成し、
上記油取込回路を、油タンクから作動油を吸い込む油吸込用油圧ポンプと、この油吸込用油圧ポンプにて吸い込まれた作動油を閉油圧回路内に取り込む油取込管とから構成し、
且つ圧力センサを上記油取込管の途中に設けたことを特徴とする請求項１に記載の昇降用油圧駆動装置。 The oil circulation circuit is composed of an oil intake circuit that takes hydraulic oil from the oil tank into the closed hydraulic circuit, and an oil extraction circuit that draws hydraulic oil from the closed hydraulic circuit to the oil tank,
The oil intake circuit is composed of an oil suction hydraulic pump that sucks hydraulic oil from an oil tank, and an oil intake pipe that takes the hydraulic oil sucked by the oil suction hydraulic pump into a closed hydraulic circuit,
2. The lifting hydraulic drive device according to claim 1, wherein a pressure sensor is provided in the middle of the oil intake pipe.
JP2005354195A 2005-12-08 2005-12-08 Hydraulic drive for lifting Active JP4693612B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010025165A (en) * 2008-07-16 2010-02-04 Ihi Corp Hydraulic drive system of sluice gate, and sluice gate
JP2012127478A (en) * 2010-12-17 2012-07-05 Tadano Ltd Drive device of hydraulic actuator

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57156655U (en) * 1981-03-27 1982-10-01
JPH09175778A (en) * 1995-12-13 1997-07-08 Liebherr Werk Ehingen Gmbh Control device for hoist mechanism of crane
JP2005306538A (en) * 2004-04-20 2005-11-04 Tcm Corp Hydraulic lifter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57156655U (en) * 1981-03-27 1982-10-01
JPH09175778A (en) * 1995-12-13 1997-07-08 Liebherr Werk Ehingen Gmbh Control device for hoist mechanism of crane
JP2005306538A (en) * 2004-04-20 2005-11-04 Tcm Corp Hydraulic lifter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010025165A (en) * 2008-07-16 2010-02-04 Ihi Corp Hydraulic drive system of sluice gate, and sluice gate
JP2012127478A (en) * 2010-12-17 2012-07-05 Tadano Ltd Drive device of hydraulic actuator

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