EP0770163B1 - Verfahren und einrichtung zur lagegerechten positionierung der an einem abwärts sich bewegenden hubgerüst einer mobilen arbeitsmaschine kippbar angeordneten arbeitsausrüstung - Google Patents
Verfahren und einrichtung zur lagegerechten positionierung der an einem abwärts sich bewegenden hubgerüst einer mobilen arbeitsmaschine kippbar angeordneten arbeitsausrüstung Download PDFInfo
- Publication number
- EP0770163B1 EP0770163B1 EP95926860A EP95926860A EP0770163B1 EP 0770163 B1 EP0770163 B1 EP 0770163B1 EP 95926860 A EP95926860 A EP 95926860A EP 95926860 A EP95926860 A EP 95926860A EP 0770163 B1 EP0770163 B1 EP 0770163B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tilting
- piston
- piston rod
- cylinder
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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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
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
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- 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
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
- E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
- E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
- E02F3/432—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
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- 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
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
- E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
- E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
- E02F3/432—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
- E02F3/433—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude horizontal, e.g. self-levelling
Definitions
- the invention relates to a method for the correct positioning of the on a downward moving mast of a mobile machine, in particular a wheel loader, tiltable work tool, in particular a shovel, according to the generic Share the first two claims.
- Mobile machines especially wheel loaders, have work equipment, in particular Buckets on the frame of the working machine by means of a lifting and lowering mast are stored.
- the work equipment especially the shovel
- the work equipment after the mast has been lowered into a position that is problem-free
- This position is usually one that runs approximately parallel to the surface to be machined.
- mobile machines with automatic return for work equipment in particular the shovel, which after activation, preferably by pressing a button, the Work equipment when lowering the mast back into the specified working position, especially digging position.
- DE-A 41 28 959 is a shovel loader device on any work vehicle known, in which at least one tilt cylinder at one end on the loader frame above the Loading arm and at the other end on a rocker arm that can be swiveled on the loading arm Formation of a parallel kinematics is articulated, which is indirectly connected to the rocker arm Loading shovel remains constant over the entire lifting range of the loading arm holds upward pivot position.
- the tilt cylinder has one through the cylinder bottom passed through extended piston rod section, the length of which is at least corresponds to that of the piston stroke and that attached to the cylinder with one Bearing eye provided connecting link a corresponding receptacle with side access is assigned to replace the seals of the cylinder base.
- the extended piston rod section forms a displacement measuring element for a switchable electro-hydraulic control, through which the cylinder adjustment movement or the tilting movement of the loading shovel on one certain place is stopped, in particular its admission position with the timetable corresponds in general to parallel blade bottom.
- a switchable electro-hydraulic control through which the cylinder adjustment movement or the tilting movement of the loading shovel on one certain place is stopped, in particular its admission position with the timetable corresponds in general to parallel blade bottom.
- US-A 3,726,428 is a device for positioning the one moving downwards Mast of a mobile machine, in particular a wheel loader, can be tilted arranged work equipment with at least one by the drive motor the driven machine pump and a spool including a spool to control at least one responsible for moving the work equipment Tilt cylinder.
- the pump delivers depending on the speed of the drive motor Hydraulic oil in various hydraulic lines on a double acting hydraulic cylinder are switched in the area of a solenoid valve.
- potentiometric control different circuits can be implemented, e.g. also lowering the mast as well tipping of work equipment in the near-earth area.
- the addition of tax times result relatively long overrun times of the tilt cylinder, so that the work equipment is not parallel but hits the floor at an angle up or down.
- the object of the invention is therefore to determine the predeterminable angle of the work equipment, in particular the blade angle, with most of the operating conditions that occur to keep constant when lowering the mast.
- This goal is achieved on the one hand in that when the piston rod is extended of the tilt cylinder at predeterminable points several measurements of the distance covered the piston rod are carried out, the first measured value triggering a signal to that effect, that the switching logic activates another solenoid valve that moves the tilting piston into one position leads in which a predeterminable reduced oil flow flows to the tilt cylinder, and that at another now slowed down movement of the piston rod a further measured value triggers another signal that the switching logic deactivates both solenoid valves and the oil flow to the tilt cylinder is interrupted.
- this goal is also achieved in that when extending the piston rod of the tilt cylinder several measurements of the distance covered at predeterminable points Way of the piston rod are carried out, the first measured value triggers a signal that the Switching logic activates another solenoid valve and simultaneously the first solenoid valve is deactivated, causing the tilting piston is guided into a position in which a predefinable reduced oil flow flows to the tilt cylinder, and that when the extension of the piston rod is now slowed down another measured value another signal to that effect triggers that the switching logic now also the rest Solenoid valve deactivated and the oil flow to the tilt cylinder is interrupted.
- One according to one or the other method according to one or more of claims 1 to 7 working device has work equipment that can be tilted on the mast, especially a shovel, at least one through the drive motor of the driven machine pump and a control slide containing a tilting piston for actuation at least one for moving work equipment responsible tilt cylinder, several from a pilot pump Actuable solenoid valves for displacement the tilting piston as a function of a specified extension path the piston rod of the tilt cylinder, at least one Measuring device in the area of the piston rod to record the current extension of the piston rod and one with the Solenoid valves connected switching logic that the solenoid valves as a function of the measured values of the measuring device controls that the further solenoid valve at a first measured value to reduce the oil flow through the spool is activated and with a second measured value the Oil flow through the control spool is interrupted.
- the other solenoid valve conducts then oil from the pilot pump into one that can be operatively connected to the tilting piston Adjustment cylinder.
- the adjusting cylinder has one large area that the force generated when the control pressure is applied is greater, so that the tilting piston is only up to a position predetermined by the stop of the piston can move.
- This stop is chosen so that the tilting piston is as large as possible Control opening releases that due to the setting on the regulator of the working hydraulic pump Load-sensing differential pressure can still pass an amount of oil that is about the same or around is slightly lower than the amount of oil that can be extracted at idling speed of the diesel engine. As soon as the extension of the piston rod of the tilt cylinder is now slow the control flag leaves the effective range of the proximity switch, it is deactivated, i.e. his signal drops again.
- both solenoid valves are now (first alternative) or, according to the second alternative, the further solenoid valve switched off again, so that the tilting piston is springs to its central position centered and thus the oil flow to the tilt cylinder is interrupted, causing the piston rod of the tilt cylinder comes to a standstill and thus also the end position of the work equipment is specified.
- the length of the control flag is preferably to be determined so that at the highest speed of the Drive motor and thus the greatest possible flow of the working hydraulic pump the piston rod of the tilt cylinder during the time from the triggering of the proximity switch when the control flag approaches, either until the adjustment cylinder stops or until the position specified by this stop is reached Tilting piston passes, the piston rod of the tilting cylinder only travels such a distance, which is the same or a little less than the specified length of the control flag.
- Figure 1 shows a schematic representation of a circuit diagram, which in this example for a Wheel loaders not shown can be used.
- the lifting frame 1 of the wheel loader is shown schematically, which at an articulation point 2 of the Wheel loader frame is articulated and raised.
- a shovel 3 work equipment which is via a lever mechanism 4,5 can be actuated by means of a tilt cylinder 6.
- the tilt cylinder 6 includes a piston rod 7 and is itself articulated in the region of a pivot point 8 on no further shown frame of the wheel loader attached.
- At the end of the piston rod 7 is one Support rod 9 attached, which acts as part of a measuring device at its free end Tax flag 10 carries.
- the tilt cylinder 6 is here by a working hydraulic pump that can be regulated in terms of its delivery pressure and volume by means of a regulator 15 16, which is driven by a diesel engine 17, operable in such a way that the volume flow of the variable displacement pump 16, as described later, in this example via the Line 18 is guided to the piston side 19 of the tilt cylinder 6.
- solenoid valves 20, 21 are provided which can be actuated by a pilot pump 22.
- the solenoid valve 20 acts here via the line 23 with the tilting piston 24 of this part only shown control spool 25 together, which is centered between two springs 26,27.
- the Solenoid valve 21 interacts via line 28 with an adjusting cylinder 29, the Piston rod 30 is operatively connected to the tilting piston 24.
- the Switching logic 13 constructed as a relay activates the solenoid valve 20 so that the tilting piston 24 of the control slide 25, via which the bucket tipping mechanism 5 is actuated, with that on the pressure relief valve 31 of the pilot pump 22 set pressure is applied.
- the tilting piston In this example, 24 moves to the left into its end position, so that the working hydraulic pump 16 promotes its oil in the space 19 of the tilt cylinder 6 which triggers the tilting movement.
- the size of this oil flow depends on the current speed of the drive motor 17 (because in the case of wheel loaders, the control opening 33 is dimensioned such that the at or close to the Maximum speed of the drive motor pumped oil flow this can also happen).
- this stop is chosen so that the tilting piston 24 has a control opening, however large 33 releases that due to the setting on the controller 15 of the working hydraulic pump 16 Load-sensing differential pressure can still pass through such an amount of oil that the same or is a little lower than the conveyable at idle speed of the drive motor 17 Amount of oil.
- the rear edge of the control lug 10 the effective range of the proximity switch 11 again, it is deactivated, i.e. his signal drops again.
- the length of the control flag 10 is to be determined so that at the highest speed of the drive motor 17 and thus the largest possible flow of the working hydraulic pump 16 die Piston rod 7 during the time from the triggering of the proximity switch 11 when approaching the control vane 10 until it reaches the stop of the piston of the adjusting cylinder 29 passes, the piston rod 7 only travels in such a way that the same or by one is slightly less than the length of the control flag 10.
- Figure 2 shows a schematic representation of an alternative circuit diagram to Figure 1, in this Example of a backhoe loader not shown can be used. There essentially the same components are used, some of which are only different are actuated, the same reference numerals as in Figure 1 are used.
- the lifting frame 1 of the backhoe loader is shown schematically, which at a pivot point 2 the loader frame is articulated so that it can be raised and lowered.
- the mast 1 At the lower end of the mast 1 is in this case articulated as a shovel 3 work equipment, which via a lever mechanism 4,5 can be actuated by means of a tilt cylinder 6.
- the tilt cylinder 6 includes a piston rod 7 and is itself articulated in the region of a pivot point 8 on no further illustrated frame of the backhoe attached.
- At the end of the piston rod 7 is one Support rod 9 attached, which acts as part of a measuring device at its free end Tax flag 10 carries.
- the tilt cylinder 6 On the tilt cylinder 6 there is a proximity switch in this example 11 formed component arranged as a twelfth part of a measuring device, the an electrical signal line 12 in operative connection with one, preferably on a relay basis built switching logic 13 is.
- the switching logic 13 could also be electronic Base.
- the switching logic 13 is in this case preferably in the driver's cabin (Not shown) provided button 14 can be activated.
- the tilt cylinder 6 is here by a working hydraulic pump that can be regulated in terms of its delivery pressure and volume by means of a regulator 15 16, which is driven by a diesel engine 17, operable in such a way that the volume flow of the variable displacement pump 16, as described later, in this example via the Line 18 is guided to the piston side 19 of the tilt cylinder 6.
- solenoid valves 20, 21 are provided which can be actuated by a pilot pump 22.
- the solenoid valve 20 acts here via the line 23 with the tilting piston 24 of this part only shown control spool 25 together, which is centered between two springs 26,27.
- the Solenoid valve 21 interacts via line 28 with an adjusting cylinder 29, the Piston rod 30 is operatively connected to the tilting piston 24.
- the Switching logic 13 constructed as a relay activates the solenoid valve 20 so that the tilting piston 24 of the control slide 25, via which the bucket tipping mechanism 5 is actuated, with that on the pressure relief valve 31 of the pilot pump 22 set pressure is applied.
- the tilting piston In this example, 24 moves to the left into its end position, so that the working hydraulic pump 16 promotes its oil in the space 19 of the tilt cylinder 6 which triggers the tilting movement.
- the size of this oil flow depends on the current speed of the drive motor 17.
- a signal is triggered, which activates the solenoid valve 21 via the switching logic 13 and the electrical line 34 and at the same time deactivates the solenoid valve 20.
- the solenoid valve 21 now directs oil from the Pilot pump 22 via line 28 into the adjusting cylinder 28.
- the adjusting cylinder 29 has so large an area that the one generated when the control pressure was applied Force is greater than the restoring force of the spring 26 of the tilt piston 24.
- the tilt piston 24 moves by the force of the spring 26 so far in the corresponding direction until it reached by the stroke of the adjusting cylinder 29 predetermined position ..
- this Stop is selected so that the tilting piston 24 opens a control opening 33, no matter how large, that due to the load-sensing differential pressure set on the regulator 15 of the working hydraulic pump 16 can still pass through such an amount of oil that is equal to or around one is slightly lower than the amount of oil that can be pumped at idle speed of the drive motor 17.
- the extension of the piston rod 7 of the tilting cylinder is now slowed down 6 the rear edge of the control flag 10 the effective range of the proximity switch 11 leaves again, it is deactivated, i.e. his signal drops again.
- the solenoid valve 21 is now also de-energized via the electrical line 34, so that the tilting piston 24 is centered in its central position by the force of the springs 26, 27 and so that the oil flow to the tilt cylinder 6 is interrupted, whereby the piston rod 7 and so that the tipper 5 come to a standstill.
- the length of the control flag 10 is to be determined so that at the highest speed of the drive motor 17 and thus the largest possible flow of the working hydraulic pump 16 die Piston rod 7 during the time from the triggering of the proximity switch 11 when approaching the control vane 10 until it reaches the stop of the piston of the adjusting cylinder 29 passes, the piston rod 7 only travels in such a way that the same or by one is slightly less than the length of the control flag 10.
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Description
- Figuren 1 und 2 -
- Alternative schematisch dargestellte Möglichkeiten zur lagegerechten Positionierung der an einem abwärts sich bewegenden Hubgerüst, beispielsweise eines Radladers oder Baggerladers, kippbar angeordneten Schaufel.
Claims (16)
- Verfahren zur lagegerechten Positionierung der an einem abwärts sich bewegenden Hubgerüst (1) einer mobilen Arbeitsmaschine, insbesondere eines Radladers, kippbar angeordneten Arbeitsausrüstung, insbesondere einer Schaufel (3), indem im Anschluß an die Betätigung einer Positionierautomatik (14) eine damit zusammenwirkende Schaltlogik (13) ein Magnetventil (20) aktiviert, so daß der Kippkolben (24) eines Steuerschiebers (25) in eine den von einer insbesondere geregelten Pumpe (16) geförderten Ölstrom zum Kippzylinder (6) freigebende Position geschaltet wird, dadurch gekennzeichnet, daß beim fortgesetzten Ausfahren der Kolbenstange (7) des Kippzylinders (6) an vorgebbaren Stellen mehrere Messungen des zurückgelegten Weges der Kolbenstange (7) durchgeführt werden, wobei der erste Meßwert ein Signal dahingehend auslöst, daß die Schaltlogik (13) ein weiteres Magnetventil (21) aktiviert, das den Kippkolben (24) in eine Position führt, in welcher ein vorgebbarer reduzierter Ölstrom zum Kippzylinder (6) fließt, und daß bei weiterer nunmehr verlangsamter Ausfahrbewegung der Kolbenstange (7) ein weiterer Meßwert ein weiteres Signal dahingehend auslöst, daß die Schaltlogik (13) beide Magnetventile (20,21) desaktiviert und der Ölstrom zum Kippzylinder (6) unterbrochen wird.
- Verfahren zur lagegerechten Positionierung der an einem abwärts sich bewegenden Hubgerüst (1) einer mobilen Arbeitsmaschine, insbesondere eines Radladers, kippbar angeordneten Arbeitsausrüstung, insbesondere einer Schaufel (3), indem im Anschluß an die Betätigung einer Positionierautomatik (14) eine damit zusammenwirkende Schaltlogik (13) ein Magnetventil (20) aktiviert, so daß der Kippkolben (24) eines Steuerschiebers (25) in eine den von einer insbesondere geregelten Pumpe (16) geförderten Ölstrom zum Kippzylinder (6) freigebende Position geschaltet wird, dadurch gekennzeichnet, daß beim fortgesetzten Ausfahren der Kolbenstange (7) des Kippzylinders (6) an vorgebbaren Stellen mehrere Messungen des zurückgelegten Weges der Kolbenstange (7) durchgeführt werden, wobei der erste Meßwert ein Signal dahingehend auslöst, daß die Schaltlogik (13) ein weiteres Magnetventil (21) aktiviert und gleichzeitig das erste Magnetventil (20) deaktiviert, wodurch der Kippkolben (24) in eine Position geführt wird, in welcher ein vorgebbarer reduzierter Ölstrom zum Kippzylinder (6) fließt, und daß bei weiterer nunmehr verlangsamter Ausfahrbewegung der Kolbenstange (7) ein weiterer Meßwert ein weiteres Signal dahingehend auslöst, daß die Schaltlogik (13) nun auch das weitere Magnetventil (21) deaktiviert und der Ölstrom zum Kippzylinder (6) unterbrochen wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Kippkolben (24) im Anschluß an die Aktivierung des Magnetventils (20) mit dem an einem Überdruckventil (31) einer Vorsteuerpumpe (22) eingestellten Druck beaufschlagt wird.
- Verfahren nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Messungen des zurückgelegten Kolbenstangenweges berührungsfrei durchgeführt werden.
- Verfahren nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Kippkolben (24) im Anschluß an seine Rückführung noch eine so große Steueröffnung (33) freigibt, daß aufgrund des am Regler (15) der Pumpe (16) eingestellten Load-Sensing-Differenzdruckes noch eine Ölmenge durchtreten kann, die niedriger ist als die bei Leerlaufdrehzahl des Antriebsmotors (17) förderbare Ölmenge.
- Verfahren nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Meßpunkte so festgelegt werden, daß bei höchster Drehzahl des Antriebsmotors (17) und damit größtmöglichem Förderstrom der Pumpe (16) die Kolbenstange (7) im Verlauf der Zeit, die zwischen der Auslösung des Signals für das Magnetventil (21) und der durch den Verstellzylinder (29) erfolgten Positionierung des Kippkolbens (24) vergeht, einen Weg zurücklegt, der gleich oder kleiner als die Länge der Steuerfahne (10) ist.
- Verfahren nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Meßpunkte so festgelegt werden, daß bei höchster Drehzahl des Antriebsmotors (17) und damit größtmöglichem Förderstrom der Pumpe (16) die Kolbenstange (7) im Verlauf der Zeit, die zwischen der Auslösung der Signale für die Magnetventile (20 und 21) und der durch den Verstellzylinder (29) erfolgten Positionierung des Kippkolbens (24) vergeht, einen Weg zurücklegt, der gleich oder kleiner als die Länge der Steuerfahne (10) ist.
- Einrichtung zur Durchführung des Verfahrens gemäß einem oder mehreren der Ansprüche 1 bis 7 mit einer kippbar am Hubgerüst angeordneten Arbeitsausrüstung, insbesondere einer Schaufel (3), mit mindestens einer durch den Antriebsmotor (17) der Arbeitsmaschine antreibbaren Pumpe (16) und einem einen Kippkolben (24) enthaltenden Steuerschieber (25) zur Ansteuerung mindestens eines für das Bewegen der Arbeitsausrüstung (3) zuständigen Kippzylinders (6), mit mehreren von einer Vorsteuerpumpe (22) beaufschlagbaren Magnetventilen zur Verschiebung des Kippkolbens (24) in Abhängigkeit eines vorgegebenen Ausfahrweges der Kolbenstange (7) des Kippzylinders (6), mit mindestens einer Meßeinrichtung (10,11) im Bereich der Kolbenstange (7) zur Erfassung des aktuellen Ausfahrweges der Kolbenstange (7) sowie mit einer mit den Magnetventilen (20,21) verbundenen Schaltlogik (13), die die Magnetventile (20,21) in Abhängigkeit der Meßwerte der Meßeinrichtung (10,11) derart ansteuert, daß bei einem ersten Meßwert das weitere Magnetventil (21) zur Verringerung des Ölstromes durch den Steuerschieber (25) aktiviert wird und bei einem zweiten Meßwert der Ölstrom durch den Steuerschieber (25) unterbrochen wird.
- Einrichtung nach Anspruch 8,
dadurch gekennzeichnet, daß die Schaltlogik (13) auf Relaisbasis aufgebaut ist. - Einrichtung nach einem oder mehreren der Ansprüche 8 und 9,
dadurch gekennzeichnet,
daß die Pumpe (16) die Arbeitshydraulikpumpe der Arbeitsmaschine und als in ihrem Fördervolumen regelbare Verstellpumpe ausgebildet ist. - Einrichtung nach einem oder mehreren der Ansprüche 8 bis 10,
dadurch gekennzeichnet,
daß die Meßeinrichtung durch einen im Bereich des Kippzylinders (6) angeordneten Näherungsschalter (11) gebildet ist, der über eine Signalleitung (12) in Wirkverbindung mit der Schaltlogik (13) steht. - Einrichtung nach einem oder mehreren der Ansprüche 8 bis 11,
dadurch gekennzeichnet,
daß im Bereich der Kolbenstange (7) eine Steuerfahne (10) angeordnet ist, die beim Ausfahren der Kolbenstange (7) über den am Kippzylinder (6) vorgesehenen Näherungsschalter (11) führbar ist. - Einrichtung nach einem oder mehreren der Ansprüche 8 bis 12,
dadurch gekennzeichnet,
daß der Kippkolben (24) des Steuerschiebers (25) ventilbetätigt in Abhängigkeit des seitens der Kolbenstange (7) zurückgelegten Weges mittels eines Verstellzylinders (29) aus der vollständig geöffneten in eine vorgebbare anteilig geöffnete Position (33) führbar ist. - Einrichtung nach einem oder mehreren der Ansprüche 8 bis 13,
dadurch gekennzeichnet,
daß der Kolben des Verstellzylinders (29) eine größere Fläche als der Kippkolben (24) aufweist, so daß der Kippkolben (24) durch den Differenzdruck, zusätzlich unterstützt durch die Kraft einer Feder (26), soweit verschoben wird, bis der Kolben des Verstellzylinders (2) seinen Anschlag erreicht hat. - Einrichtung nach einem oder mehreren der Ansprüche 8 bis 13,
dadurch gekennzeichnet,
daß der Kolben des Verstellzylinders (29) eine so große Fläche aufweist, daß die bei Beaufschlagung mit dem Steuerdruck erzeugte Kraft größer als die Rückstellkraft der Feder (26) des Kippzylinders (24) ist, so daß sich der Kippkolben (24) nur bis zu einer durch den Anschlag des Kolbens des Verstellzylinders (29) vorgegebenen Stellung bewegt. - Einrichtung nach einem oder mehreren der Ansprüche 8 bis 15,
dadurch gekennzeichnet,
daß bei Deaktivierung der Magnetventile (20,21) der Kippkolben (24) durch die Kraft zweier Federn (26,27) in seiner Mittelstellung zentrierbar ist.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4424621 | 1994-07-13 | ||
DE4424621 | 1994-07-13 | ||
DE4437300A DE4437300C2 (de) | 1994-07-13 | 1994-10-19 | Verfahren und Einrichtung zur lagegerechten Positionierung der an einem abwärts sich bewegenden Hubgerüst einer mobilen Arbeitsmaschine kippbar angeordneten Arbeitsausrüstung |
DE4437300 | 1994-10-19 | ||
PCT/EP1995/002721 WO1996002707A1 (de) | 1994-07-13 | 1995-07-12 | Verfahren und einrichtung zur lagegerechten positionierung der an einem abwärts sich bewegenden hubgerüst einer mobilen arbeitsmaschine kippbar angeordneten arbeitsausrüstung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0770163A1 EP0770163A1 (de) | 1997-05-02 |
EP0770163B1 true EP0770163B1 (de) | 1999-05-26 |
Family
ID=25938278
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95926860A Expired - Lifetime EP0770163B1 (de) | 1994-07-13 | 1995-07-12 | Verfahren und einrichtung zur lagegerechten positionierung der an einem abwärts sich bewegenden hubgerüst einer mobilen arbeitsmaschine kippbar angeordneten arbeitsausrüstung |
Country Status (4)
Country | Link |
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US (1) | US5784812A (de) |
EP (1) | EP0770163B1 (de) |
AT (1) | ATE180529T1 (de) |
WO (1) | WO1996002707A1 (de) |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000058565A1 (en) * | 1999-03-31 | 2000-10-05 | Caterpillar Inc. | Variable float system |
DE19939796C1 (de) | 1999-08-21 | 2000-11-23 | Orenstein & Koppel Ag | Verfahren und Arbeitsmaschine zur Herstellung von Bodenflächen |
DE102006024731B3 (de) * | 2006-05-26 | 2007-08-16 | Cnh Baumaschinen Gmbh | Verfahren zur lagegerechten Ausrichtung einer an einem heb- und senkbaren Hubgerüst einer Arbeitsmaschine kippbar angeordeten Arbeitausrüstung sowie Arbeitsmaschine |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3484010A (en) * | 1967-10-09 | 1969-12-16 | Caterpillar Tractor Co | Control system for an ejector bucket |
US3726428A (en) * | 1971-02-04 | 1973-04-10 | Int Harvester Co | Control circuit for front end loader |
GB2035464B (en) * | 1978-11-28 | 1982-12-15 | Dartec Ltd | Actuator protection assemblies |
DE2936005A1 (de) * | 1979-09-06 | 1981-03-19 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Gasturbineneinheit mit hilfsaggregaten und druckluftabzweigungen oder unter druck anstehendem gas |
DE3409705A1 (de) * | 1984-03-16 | 1985-09-19 | Robert Bosch Gmbh, 7000 Stuttgart | Verfahren zur rueckmeldung von stoerungen auf die bremspedalcharakteristik und hydraulischer bremskraftverstaerker |
US5497568A (en) * | 1991-03-06 | 1996-03-12 | Strickland; William A. | Integrated group of excavator control assemblies |
DE4128959A1 (de) * | 1991-08-30 | 1993-03-04 | Schaeff Karl Gmbh & Co | Schaufellader-kippzylinder |
KR0132687B1 (ko) * | 1992-04-20 | 1998-04-18 | 오까다 하지메 | 토목, 건설기계의 유압회로장치 |
EP0638690B1 (de) * | 1993-02-09 | 1999-09-08 | Hitachi Construction Machinery Co., Ltd. | Hydraulische steuerungsvorrichtung für baumaschinen |
JPH0685449U (ja) * | 1993-05-24 | 1994-12-06 | 株式会社小松製作所 | 排土板制御装置 |
DE4341244C2 (de) * | 1993-12-03 | 1997-08-14 | Orenstein & Koppel Ag | Steuerung zur Aufteilung des durch mindestens eine Pumpe zur Verfügung gestellten Förderstromes bei Hydrauliksystemen auf mehrere Verbraucher |
-
1995
- 1995-07-12 EP EP95926860A patent/EP0770163B1/de not_active Expired - Lifetime
- 1995-07-12 US US08/666,436 patent/US5784812A/en not_active Expired - Fee Related
- 1995-07-12 WO PCT/EP1995/002721 patent/WO1996002707A1/de active IP Right Grant
- 1995-07-12 AT AT95926860T patent/ATE180529T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP0770163A1 (de) | 1997-05-02 |
US5784812A (en) | 1998-07-28 |
ATE180529T1 (de) | 1999-06-15 |
WO1996002707A1 (de) | 1996-02-01 |
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