EP0702756B1 - Safety arrangement on hydraulic piston-cylinder units - Google Patents

Safety arrangement on hydraulic piston-cylinder units Download PDF

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Publication number
EP0702756B1
EP0702756B1 EP95908166A EP95908166A EP0702756B1 EP 0702756 B1 EP0702756 B1 EP 0702756B1 EP 95908166 A EP95908166 A EP 95908166A EP 95908166 A EP95908166 A EP 95908166A EP 0702756 B1 EP0702756 B1 EP 0702756B1
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EP
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Prior art keywords
piston
hydraulic piston
cylinder
sensor
pct
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EP95908166A
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German (de)
French (fr)
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EP0702756A1 (en
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Alois Wimmer
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/24—Safety devices, e.g. for preventing overload
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • E02F3/3654—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat with energy coupler, e.g. coupler for hydraulic or electric lines, to provide energy to drive(s) mounted on the tool
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
    • E02F3/3663—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat hydraulically-operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems

Definitions

  • the invention relates to a safety device on hydraulic Piston-cylinder units, in particular for monitoring Locking cylinders, e.g. of work tools attached to an excavator boom are attached, with a sensor on the hydraulic piston-cylinder unit Monitoring of the piston position is provided, which is electrical with a Monitoring circuit to trigger an alarm device when incorrect Piston position is coupled.
  • a monitoring device of the type mentioned above is e.g. from the US-PS 5049027, in which a microswitch is provided, which only is closed with the locking cylinder retracted and then one Control lamp lights up.
  • This well-known training has the Disadvantage that the locking cylinder can be operated freely, without that Control device must be considered.
  • the invention has for its object a safety device to create the type mentioned, in which a simple operation of the Locking cylinder is turned off, which means that these cylinders are conscious must be unlocked in order to release work tools.
  • this object is achieved in that with the sensor with the monitoring circuit electrically coupled and electrically operated check valve is coupled to control the hydraulic piston-cylinder unit. It must that is, before the locking cylinder is actuated, the electrically actuated shut-off valve be operated via the monitoring circuit, since this check valve is used to the locking cylinder after its adjustment in its new adjustment position hold, this check valve just for adjusting the locking cylinder is opened. It is also achieved that the sensor also Control circuit for the check valve is checked.
  • a button can advantageously be used to actuate the shut-off valve Bridging the monitoring circuit may be provided. Only after pressing this button is then activated accordingly Locking cylinder an adjustment of the same possible. After all, in that Monitoring circuit a relay controlled by the sensor to trigger the Alarm device can be provided, whereby the switching on of Alarm devices can be made quickly via the monitoring circuit can.
  • this safety device serves that on the part of the operator for locking and unlocking the Locking cylinder two hands are needed, that is, with one hand the shut-off valve must be opened and then the other hand Locking cylinder is operated. It is excluded that a change the excavator bucket is made while the excavator boom is being operated, since there is an increased risk of accidents for people working on the construction site results, since the work tool may be picked up, however the locking cylinder is not retracted into the associated eyelet, but only by e.g. Clamp is held.
  • Fig. 1 shows the hydraulic circuit diagram for an attachment on a Excavator boom, with a locking cylinder with safety device is provided.
  • Fig. 2 shows the electrical circuit diagram for a Lock cylinder monitoring device.
  • Fig. 3 gives a front view the locking cylinder again.
  • Fig. 4 is a side view of the Locking cylinder seen in the direction of arrow A of FIG. 3.
  • This hydraulic piston-cylinder unit 1 is a check valve 2 in the desired position fixable.
  • a sensor 3 is used to monitor this position provided which determines whether the working piston of the hydraulic Piston-cylinder unit 1 is in the desired position.
  • On such a working tool is indicated at 5, for example, two of which are shown in FIG. 1 Variants are reproduced, namely either a Grapple slewing motor 5 'or the swivel cylinder 5' 'for embankment spoons.
  • a control valve for the hydraulic piston-cylinder unit 1 denotes with which the hydraulic circuits can be switched so that either the hydraulic piston-cylinder unit 1 or the work tool 5 can be controlled.
  • 7 is a so-called Swivel block, i.e. the flexible connection between the rigid Hydraulic lines on the excavator boom and the hydraulic lines on swiveling coupling part for the working tools.
  • the sensor 3 is connected to a monitoring circuit, which for Triggering an alarm device is provided, which from a control lamp 10 and a siren 11.
  • the connection between the sensor 3 and the Monitoring circuit 9 takes place via lines 12, 13, line 13 at the same time forms the control line for the check valve 2.
  • the check valve 2 is also connected to the monitoring circuit via line 14 (see Fig. 2).
  • a relay 15 is provided, which one Switch 16 actuated. This switch serves to activate the alarm devices 10, 11 switch on or switch off when the sensor is in the correct position.
  • At 17 is one Denoted potentiometer, which is connected in parallel with the switch 16 and for Feeding the siren 11 is used.
  • a button is designated, which for Bridging the line 14 to the check valve is used, with a fuse 19 in the Line is interposed. This button 18 is used by closing the Circuit to act on the check valve 2 so that it switches to continuity and thus actuation of the hydraulic piston-cylinder unit 1 via the Control valve 4 allows with the correct position of the control valve 6.
  • the control valve In the position of the valves shown in Fig. 1, the control valve is in Rest position, the control valve 6 is connected to the hydraulic Piston-cylinder unit 1 set and the check valve 2 locked. In this locked position, the sensor 3 is closed, so that the relay 15 with current is applied and the switch 16 in the position shown in dashed lines in Fig. 2 has spent.
  • the alarm devices 10, 11 are thus inoperative and the hydraulic piston-cylinder unit or the one formed by it Locking cylinder in the working position.
  • the button 18 must first Check valve 2 are switched to the through position, which does this is accomplished that the check valve 2 is designed as a solenoid valve, with Current application against the force of a spring 2 'in the valve Through position is switched. Then can the control valve 4 Piston of the hydraulic piston-cylinder unit 1 in the unlocked position be moved.
  • the relay 15 de-energized, so that during the entire changing process Alarm device 10, 11 is in action, and only after the whole Locking cylinder again by closing sensor 3 and thus Acting on the relay 15 and flipping the switch 16 in the broken line in FIG Position is switched off.
  • the alarm device 10, 11 is switched off, the excavator operator realizes that the locking cylinder has engaged properly is.
  • the control valve 6 If the working tool 5 is to be actuated with the help of the control valve 4, then the control valve 6 from the position shown in Fig. 1 in the Alternative position transferred, which then the two connectors 8 under Stand pressure and thus depending on the position of the valve 4, the working tool actuate.
  • the hydraulic piston-cylinder unit 1 is then from the hydraulic pressure uncoupled, which means that in the system of the hydraulic piston-cylinder unit 1 located hydraulic fluid is locked and thus an adjustment of the Locking cylinder prevented while working with the working tool.

Abstract

PCT No. PCT/AT95/00037 Sec. 371 Date Nov. 2, 1995 Sec. 102(e) Date Nov. 2, 1995 PCT Filed Feb. 21, 1995 PCT Pub. No. WO95/23925 PCT Pub. Date Sep. 8, 1995The invention relates to a safety arrangement on hydraulic piston-cylinder units. In particular for monitoring locking cylinders, e.g., of operating tools mounted on a grab bucket boom. A sensor for monitoring the piston position is provided on the piston-cylinder unit and is coupled electrically to a monitoring circuit for triggering an alarm arrangement if the piston is incorrectly positioned. The sensor (3) is coupled to an electrically actuatable locking valve (2) coupled in the monitoring circuit (9) for controlling the hydraulic piston-cylinder unit (1).

Description

Die Erfindung bezieht sich auf eine Sicherheitseinrichtung an hydraulischen Kolben-Zylinder-Einheiten, insbesondere zur Überwachung von Verriegelunszylindern, z.B. von Arbeitswerkzeugen, die an einem Baggerausleger angebracht sind, wobei an der hydraulischen Kolben-Zylinder-Einheit ein Sensor zur Überwachung der Kolbenstellung vorgesehen ist, der elektrisch mit einem Überwachungsschaltkreis zur Auslösung einer Alarmeinrichtung bei unrichtiger Kolbenstellung gekoppelt ist.The invention relates to a safety device on hydraulic Piston-cylinder units, in particular for monitoring Locking cylinders, e.g. of work tools attached to an excavator boom are attached, with a sensor on the hydraulic piston-cylinder unit Monitoring of the piston position is provided, which is electrical with a Monitoring circuit to trigger an alarm device when incorrect Piston position is coupled.

Insbesondere bei Verriegelungszylindern ist es wesentlich, daß die richtige Stellung der Verriegelungsmittel, welche mittels der hydraulischen Kolben-Zylinder-Einheit betätigt sind, zuverlässig in der Verriegelungsstellung gehalten werden bzw. auch überwacht werden, ob sie sich aufgrund der Arbeitsbewegungen des Arbeitswerkzeuges aus ihrer Verriegelungsstellung hinausbewegen.With locking cylinders in particular, it is essential that the correct one Position of the locking means, which by means of the hydraulic Piston-cylinder unit are operated reliably in the locked position are kept or also monitored whether they are due to the Working movements of the working tool from their locked position move out.

Eine Überwachungseinrichtung eingangs genannter Art geht z.B. aus der US-PS 5049027 hervor, bei welcher ein Mikroschalter vorgesehen ist, welcher nur bei eingefahrenem Verriegelungszylinder geschlossen wird und dann eine Kontrolleuchte zum Aufleuchten bringt. Diese bekannte Ausbildung hat den Nachteil, daß die Verriegelungszylinder frei betätigbar sind, ohne daß auf die Kontrolleinrichtung Bedacht genommen werden muß.A monitoring device of the type mentioned above is e.g. from the US-PS 5049027, in which a microswitch is provided, which only is closed with the locking cylinder retracted and then one Control lamp lights up. This well-known training has the Disadvantage that the locking cylinder can be operated freely, without that Control device must be considered.

Der Erfindung liegt die Aufgabe zugrunde, eine Sicherheitseinrichtung der eingangs genannten Art zu schaffen, bei welcher eine einfache Betätigung der Verriegelungszylinder ausgeschaltet ist, das heißt, daß diese Zylinder bewußt entriegelt werden müssen, um ein Freigeben von Arbeitswerkzeugen zu erreichen.The invention has for its object a safety device to create the type mentioned, in which a simple operation of the Locking cylinder is turned off, which means that these cylinders are conscious must be unlocked in order to release work tools.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß mit dem Sensor ein mit dem Überwachungsschaltkreis elektrisch gekoppeltes und elektrisch betätigbares Sperrventil zur Ansteuerung der hydraulischen Kolben-Zylindereinheit gekoppelt ist. Es muß also vor Betätigung des Verriegelungszylinders das elektisch betätigbare Sperrventil über den Überwachungsschaltkreis betätigt werden, da dieses Sperrventil dazu dient, den Verriegelungszylinder nach seinem Verstellen in seiner neuen Verstellage zu halten, wobei dieses Sperrventil eben nur zum Verstellen des Verriegelungszylinders geöffnet wird. Weiters wird erreicht, daß durch den Sensor auch der Steuerschaltkreis für das Sperrventil überprüft wird.According to the invention this object is achieved in that with the sensor with the monitoring circuit electrically coupled and electrically operated check valve is coupled to control the hydraulic piston-cylinder unit. It must that is, before the locking cylinder is actuated, the electrically actuated shut-off valve be operated via the monitoring circuit, since this check valve is used to the locking cylinder after its adjustment in its new adjustment position hold, this check valve just for adjusting the locking cylinder is opened. It is also achieved that the sensor also Control circuit for the check valve is checked.

Vorteilhafterweise kann für die Betätigung des Sperrventils ein Taster zur Überbrückung des Überwachungsschaltkreises vorgesehen sein. Erst nach Drücken dieses Tasters ist dann durch entsprechende Beaufschlagung des Verriegelungszylinders ein Verstellen desselben möglich. Schließlich kann in dem Überwachungsschaltkreis ein vom Sensor angesteuertes Relais zum Auslösen der Alarmeinrichtung vorgesehen sein, wodurch auf einfache Weise das Einschalten von Alarmeinrichtungen über den Überwachungsschaltkreis rasch vorgenommen werden kann.A button can advantageously be used to actuate the shut-off valve Bridging the monitoring circuit may be provided. Only after pressing this button is then activated accordingly Locking cylinder an adjustment of the same possible. After all, in that Monitoring circuit a relay controlled by the sensor to trigger the Alarm device can be provided, whereby the switching on of Alarm devices can be made quickly via the monitoring circuit can.

Zusammenfassend ist also festzuhalten, daß diese Sicherheitseinrichtung dazu dient, daß seitens der Bedienungsperson für das Ver- und Entriegeln des Verriegelungszylinders zwei Hände gebraucht werden, das heißt, daß mit einer Hand das Sperrventil geöffnet werden muß und mit der anderen Hand dann der Verriegelungszylinder betätigt wird. Es wird damit ausgeschlossen, daß ein Wechsel der Baggerschaufel während der Betätigung des Baggerauslegers vorgenommen wird, da letztens ein erhöhtes Unfallrisiko von auf der Baustelle arbeitenden Personen ergibt, da es vorkommen kann, daß das Arbeitswerkzeug aufgenommen wird, jedoch der Verriegelungszylinder nicht in die zugehörige Öse eingefahren wird, sondern nur durch z.B. Klemmung festgehalten ist.In summary, it should be noted that this safety device is used serves that on the part of the operator for locking and unlocking the Locking cylinder two hands are needed, that is, with one hand the shut-off valve must be opened and then the other hand Locking cylinder is operated. It is excluded that a change the excavator bucket is made while the excavator boom is being operated, since there is an increased risk of accidents for people working on the construction site results, since the work tool may be picked up, however the locking cylinder is not retracted into the associated eyelet, but only by e.g. Clamp is held.

In der Zeichnung ist ein Ausführungsbeispiel des Erfindungsgegenstandes dargestellt. Fig. 1 zeigt den Hydraulikschaltplan für ein Anbauwerkzeug an einem Baggerausleger, wobei ein Verriegelungszylinder mit Sicherungseinrichtung vorgesehen ist. Fig. 2 zeigt den elektrischen Schaltplan für eine Überwachungseinrichtung des Verriegelungszylinders. Fig. 3 gibt eine Vorderansicht des Verriegelungszylinders wieder. Fig. 4 ist eine Seitenansicht des Verriegelungszylinders in Richtung des Pfeiles A der Fig. 3 gesehen.In the drawing is an embodiment of the subject matter of the invention shown. Fig. 1 shows the hydraulic circuit diagram for an attachment on a Excavator boom, with a locking cylinder with safety device is provided. Fig. 2 shows the electrical circuit diagram for a Lock cylinder monitoring device. Fig. 3 gives a front view the locking cylinder again. Fig. 4 is a side view of the Locking cylinder seen in the direction of arrow A of FIG. 3.

Mit 1 ist eine hydrauliche Kolben-Zylinder-Einheit bezeichnet, welche bei vorliegendem Ausführungsbeispiel den Verriegelungszylinder einer Kuppeleinrichtung für Arbeitswerkzeuge an einem Baggerausleger bildet. Diese hydraulische Kolben-Zylinder-Einheit 1 ist über einen Sperrventil 2 in der gewünschten Lage fesflegbar. Zur Überwachung dieser Lage ist ein Sensor 3 vorgesehen, welcher ermittelt, ob der Arbeitskolben der hydraulischen Kolben-Zylinder-Einheit 1 in der gewünschten Stellung liegt. Die Beaufschlagung der hydraulischen Kolben-Zylinder-Einheit 1 erfolgt über ein Steuerventil 4, welches gleichzeitig auch das Steuerventil für ein Arbeitswerkzeug bilden kann. Ein derartiges Arbeitswerkzeug ist mit 5 beispielsweise angegeben, wobei in Fig. 1 zwei Ausführungsvarianten wiedergegeben sind, nämlich entweder ein Greiferdrehwerksmotor 5' oder der Schwenkzylinder 5'' für Böschungslöffeln.1 with a hydraulic piston-cylinder unit is designated, which at The present embodiment, the locking cylinder Forms coupling device for working tools on an excavator boom. This hydraulic piston-cylinder unit 1 is a check valve 2 in the desired position fixable. A sensor 3 is used to monitor this position provided which determines whether the working piston of the hydraulic Piston-cylinder unit 1 is in the desired position. The application of hydraulic piston-cylinder unit 1 via a control valve 4, which can also form the control valve for a work tool at the same time. On such a working tool is indicated at 5, for example, two of which are shown in FIG. 1 Variants are reproduced, namely either a Grapple slewing motor 5 'or the swivel cylinder 5' 'for embankment spoons.

Mit 6 ist ein Steuerventil für die hydraulische Kolben-Zylinder-Einheit 1 bezeichnet, mit welchem die Hydraulikschaltkreise so geschaltet werden können, daß entweder die hydraulische Kolben-Zylinder-Einheit 1 oder aber das Arbeitswerkzeug 5 angesteuert werden kann. Mit 8 sind Steckkupplungen zur Verbindung der Hydraulikleitungen mit dem Arbeitswerkzeug bezeichnet. 7 ist ein sogenannter Schwenkblock, d.h. die flexible Verbindung zwischen den starren Hydraulikleitungen am Baggerausleger und den Hydraulikleitungen am schwenkbaren Kupplungsteil für die Arbeitswerkzeuge.6 is a control valve for the hydraulic piston-cylinder unit 1 denotes with which the hydraulic circuits can be switched so that either the hydraulic piston-cylinder unit 1 or the work tool 5 can be controlled. With 8 plug-in couplings for connecting the Hydraulic lines designated with the work tool. 7 is a so-called Swivel block, i.e. the flexible connection between the rigid Hydraulic lines on the excavator boom and the hydraulic lines on swiveling coupling part for the working tools.

Der Sensor 3 ist mit einem Überwachungsschaltkreis verbunden, welcher zur Auslösung einer Alarmeinrichtung vorgesehen ist, welche aus einer Kontrollampe 10 und einer Sirene 11 besteht. Die Verbindung zwischen dem Sensor 3 und dem Überwachungsschaltkreis 9 erfolgt über Leitungen 12, 13, wobei die Leitung 13 gleichzeitig auch die Ansteuerleitung für das Sperrventil 2 bildet. Das Sperrventil 2 ist mit dem Überwachungsschaltkreis zusätzlich noch über die Leitung 14 verbunden (siehe Fig. 2). The sensor 3 is connected to a monitoring circuit, which for Triggering an alarm device is provided, which from a control lamp 10 and a siren 11. The connection between the sensor 3 and the Monitoring circuit 9 takes place via lines 12, 13, line 13 at the same time forms the control line for the check valve 2. The check valve 2 is also connected to the monitoring circuit via line 14 (see Fig. 2).

Im Überwachungsschaltkreis 9 ist ein Relais 15 vorgesehen, welches einen Schalter 16 betätigt. Dieser Schalter dient dazu, die Alarmeinrichtungen 10, 11 einzuschalten bzw. bei richtiger Stellung des Sensors auszuschalten. Mit 17 ist ein Potentiometer bezeichnet, welches dem Schalter 16 parallelgeschaltet ist und zur Anspeisung der Sirene 11 dient. Mit 18 ist ein Taster bezeichnet, welcher zur Überbrückung der Leitung 14 zum Sperrventil dient, wobei eine Sicherung 19 in der Leitung zwischengeschaltet ist. Dieser Taster 18 dient dazu, durch Schließen des Stromkreises das Sperrventil 2 so zu beaufschlagen, daß es auf Durchgang schaltet und somit eine Betätigung der hydraulischen Kolben-Zylinder-Einheit 1 über das Steuerventil 4 bei richtiger Stellung des Steuerventils 6 ermöglicht.In the monitoring circuit 9, a relay 15 is provided, which one Switch 16 actuated. This switch serves to activate the alarm devices 10, 11 switch on or switch off when the sensor is in the correct position. At 17 is one Denoted potentiometer, which is connected in parallel with the switch 16 and for Feeding the siren 11 is used. With 18 a button is designated, which for Bridging the line 14 to the check valve is used, with a fuse 19 in the Line is interposed. This button 18 is used by closing the Circuit to act on the check valve 2 so that it switches to continuity and thus actuation of the hydraulic piston-cylinder unit 1 via the Control valve 4 allows with the correct position of the control valve 6.

Bei der in Fig. 1 wiedergegebenen Stellung der Ventile ist das Steuerventil in Ruhestellung, das Steuerventil 6 ist auf Verbindung mit der hydraulischen Kolben-Zylinder-Einheit 1 eingestellt und das Sperrventil 2 verriegelt. In dieser verriegelten Stellung ist der Sensor 3 geschlossen, sodaß das Relais 15 mit Strom beaufschlagt ist und den Schalter 16 in die in Fig. 2 strichliert eingezeichnete Stellung verbracht hat. Damit sind die Alarmeinrichtungen 10, 11 außer Funktion und die hydraulische Kolben-Zylinder-Einheit bzw. der durch sie gebildete Verriegelungszylinder in Arbeitsstellung.In the position of the valves shown in Fig. 1, the control valve is in Rest position, the control valve 6 is connected to the hydraulic Piston-cylinder unit 1 set and the check valve 2 locked. In this locked position, the sensor 3 is closed, so that the relay 15 with current is applied and the switch 16 in the position shown in dashed lines in Fig. 2 has spent. The alarm devices 10, 11 are thus inoperative and the hydraulic piston-cylinder unit or the one formed by it Locking cylinder in the working position.

Falls sich nun aus irgendwelchen Gründen der Verriegelungszylinder aus der in Fig. 1 wiedergegebenen Stellung bewegt, u.zw. sei es durch Undichtheit der Leitungen oder durch sonst welche äußere Einflüsse, dann unterbricht der Sensor 3 den Stromfluß zwischen den Leitungen 12, 13, wodurch das Relais 15 stromlos wird und abfällt. Damit gelangt der Schalter 16 in die in Fig. 2 voll eingezeichnete Stellung und schließt den Stromkreis für die Alarmeinrichtung 10, 11. Damit wird der Baggerfahrer darauf aufmerksam gemacht, daß bei der Verriegelung des Arbeitswerkzeuges etwas nicht in Ordnung ist. Daraufhin hat der Baggerführer dann den Sitz und die Stellung des Verriegelungszylinders zu überprüfen.If for any reason the locking cylinder from the in Fig. 1 reproduced position moves, etc. be it through the leakage of the Cables or other external influences, then the sensor 3 interrupts the current flow between the lines 12, 13, whereby the relay 15 is de-energized and falls off. The switch 16 thus moves to that which is fully drawn in FIG. 2 Position and closes the circuit for the alarm device 10, 11. This is the Excavators pointed out that when locking the Something is wrong. Then the excavator operator then check the fit and position of the locking cylinder.

Soll nun das Arbeitswerkzeug des Baggerauslegers getauscht werden, d.h. daß der Verriegelungszylinder entriegeln soll, dann muß zunächst durch den Taster 18 das Sperrventil 2 in die Durchgangsstellung geschaltet werden, was dadurch bewerkstelligt ist, daß das Sperrventil 2 als Magnetventil ausgebildet ist, wobei bei Strombeaufschlagung das Ventil entgegen der Kraft einer Feder 2' in die Durchgangsstellung geschaltet wird. Danach kann dann über das Steuerventil 4 der Kolben der hydraulischen Kolben-Zylinder-Einheit 1 in die Entriegelstellung verschoben werden. Während des gesamten Arbeitswerkzeug-Wechselvorganges ist das Relais 15 stromlos, sodaß während des gesamten Wechselvorganges die Alarmeinrichtung 10, 11 in Tätigkeit ist, und erst nach völligem Einrasten des Verriegelungszylinders wieder durch Schließen des Sensors 3 und damit Beaufschlagen des Relais 15 und Umlegen des Schalters 16 in die in Fig. 2 strichlierte Stellung ausgeschaltet wird. Sobald die Alarmeinrichtung 10, 11 ausgeschaltet ist, erkennt der Baggerfahrer, daß der Verriegelungszylinder ordnungsgemäß eingerastet ist.If the work tool of the excavator boom is to be replaced, i.e. that the locking cylinder is to unlock, then the button 18 must first Check valve 2 are switched to the through position, which does this is accomplished that the check valve 2 is designed as a solenoid valve, with Current application against the force of a spring 2 'in the valve Through position is switched. Then can the control valve 4 Piston of the hydraulic piston-cylinder unit 1 in the unlocked position be moved. During the entire work tool change process the relay 15 de-energized, so that during the entire changing process Alarm device 10, 11 is in action, and only after the whole Locking cylinder again by closing sensor 3 and thus Acting on the relay 15 and flipping the switch 16 in the broken line in FIG Position is switched off. As soon as the alarm device 10, 11 is switched off, the excavator operator realizes that the locking cylinder has engaged properly is.

Falls mit Hilfe des Steuerventils 4 das Arbeitswerkzeug 5 betätigt werden soll, dann wird das Steuerventil 6 von der in Fig. 1 wiedergegebenen Stellung in die Alternativstellung übergeführt, wodurch dann die beiden Steckverbindungen 8 unter Druck stehen und damit je nach Stellung des Ventils 4 das Arbeitswerkzeug betätigen. Die hydraulische Kolben-Zylinder-Einheit 1 ist dann vom Hydraulikdruck abgekoppelt, wodurch die im System der hydraulischen Kolben-Zylinder-Einheit 1 befindliche Hydraulikflüssigkeit eingesperrt ist und damit ein Verstellen des Verriegelungszylinders während des Arbeitens mit dem Arbeitswerkzeug verhindert.If the working tool 5 is to be actuated with the help of the control valve 4, then the control valve 6 from the position shown in Fig. 1 in the Alternative position transferred, which then the two connectors 8 under Stand pressure and thus depending on the position of the valve 4, the working tool actuate. The hydraulic piston-cylinder unit 1 is then from the hydraulic pressure uncoupled, which means that in the system of the hydraulic piston-cylinder unit 1 located hydraulic fluid is locked and thus an adjustment of the Locking cylinder prevented while working with the working tool.

Claims (3)

  1. Safety device on hydraulic piston-cylinder-units, especially for the control of interlock cylinders e.g. of work tools which are attached to an excavator boom, whereby a sensor (3) for control of the piston position is provided on the hydraulic piston-cylinder-unit (1) and is electrically coupled to a control circuit (9) to actuate an alarm device in case of incorrect piston position, characterized in that an electrically activated check valve (2), which is electrically coupled to the control circuit (9), is coupled to sensor (3) to activate the piston-cylinder-unit (1).
  2. Safety device according to Claim 1, characterized in that a switch (18) for bypass of control circuit (9) is provided for actuation of check valve (2).
  3. Safety device according to Claims 1 or 2, characterized in that a relay (15) activated by sensor (3) is provided in the control circuit (9) for the purpose of releasing the alarm device (10,11).
EP95908166A 1994-03-02 1995-02-21 Safety arrangement on hydraulic piston-cylinder units Expired - Lifetime EP0702756B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AT448/94 1994-03-02
AT44894 1994-03-02
AT0044894A AT401785B (en) 1994-03-02 1994-03-02 SAFETY DEVICE ON HYDRAULIC PISTON-CYLINDER UNITS
PCT/AT1995/000037 WO1995023925A1 (en) 1994-03-02 1995-02-21 Safety arrangement on hydraulic piston-cylinder units

Publications (2)

Publication Number Publication Date
EP0702756A1 EP0702756A1 (en) 1996-03-27
EP0702756B1 true EP0702756B1 (en) 2000-05-17

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ID=3490886

Family Applications (1)

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EP95908166A Expired - Lifetime EP0702756B1 (en) 1994-03-02 1995-02-21 Safety arrangement on hydraulic piston-cylinder units

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US (1) US5727442A (en)
EP (1) EP0702756B1 (en)
JP (1) JPH09500438A (en)
AT (2) AT401785B (en)
CA (1) CA2161972A1 (en)
DE (1) DE59508343D1 (en)
WO (1) WO1995023925A1 (en)

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Also Published As

Publication number Publication date
WO1995023925A1 (en) 1995-09-08
EP0702756A1 (en) 1996-03-27
JPH09500438A (en) 1997-01-14
US5727442A (en) 1998-03-17
AT401785B (en) 1996-11-25
ATE193101T1 (en) 2000-06-15
CA2161972A1 (en) 1995-09-08
ATA44894A (en) 1996-04-15
DE59508343D1 (en) 2000-06-21

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