EP0227716B1 - Switching arrangement for the hydraulic supply of aggregate of a loader - Google Patents

Switching arrangement for the hydraulic supply of aggregate of a loader Download PDF

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Publication number
EP0227716B1
EP0227716B1 EP19860903295 EP86903295A EP0227716B1 EP 0227716 B1 EP0227716 B1 EP 0227716B1 EP 19860903295 EP19860903295 EP 19860903295 EP 86903295 A EP86903295 A EP 86903295A EP 0227716 B1 EP0227716 B1 EP 0227716B1
Authority
EP
European Patent Office
Prior art keywords
control valve
pump
loader
cylinder
main control
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
Application number
EP19860903295
Other languages
German (de)
French (fr)
Other versions
EP0227716A1 (en
Inventor
Otto Dr.-Ing. Dingerkus
Reinhold Rausch
Wilfried Dipl.-Ing. Gräf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rudolf Hausherr & Sohne & Co KG GmbH
Rudolf Hausherr and Sohne GmbH and Co KG
Original Assignee
Rudolf Hausherr & Sohne & Co KG GmbH
Rudolf Hausherr and Sohne GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rudolf Hausherr & Sohne & Co KG GmbH, Rudolf Hausherr and Sohne GmbH and Co KG filed Critical Rudolf Hausherr & Sohne & Co KG GmbH
Publication of EP0227716A1 publication Critical patent/EP0227716A1/en
Application granted granted Critical
Publication of EP0227716B1 publication Critical patent/EP0227716B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump
    • 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
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
    • 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
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps

Definitions

  • the invention relates to a circuit arrangement for the hydraulic loading of the units of a loader, such as traction motors, loading shovel equipped with impact devices, cylinder-piston units or the like.
  • Loaders of this type are advantageously used for treading the sole in pit rooms; however, these are also suitable for performing work above ground.
  • Loaders which each have their own energy source in the form of a pump for each consumer group, such as traction motors, cylinder-piston working cylinders and for the impact devices of the loading shovel. It is known to design these pumps in a power-controlled manner for the ancillary motors or in a pressure-controlled manner for the cylinder-piston units and the impact devices in order to be able to adapt them to the respective requirements.
  • this known solution proves to be disadvantageous because the total installed power is very high, because it results from the sum of all installed pumps, for which power must be kept available. The entire installation is therefore very costly and space-consuming.
  • a circuit arrangement for a charger according to the preamble of claim 1 is known from US-A-3606049.
  • the invention has for its object to provide a circuit arrangement of the type mentioned, which allows with a minimum of installed power to fully cover all load cases occurring in the practice of a loader at any time.
  • the pumps are connected to a main control valve, in the first position of which the pump with the higher output with the control valve for the traction motors and the pump with the lower output with the control valve for the cylinder-piston units or. Like. Is connected, while in the second position of the main control valve, the pump with the higher power with the control valves for the cylinder-piston units or the like. As well as the impact devices of the loading shovel and the pump with the lower power with the control valve for the traction motors communicates. This configuration ensures that the pump applies the higher power to the traction motors while the loader is traveling, i.e.
  • the loader runs at high speed, while at the same time the cylinder-piston units are fed by the pump with the lower output.
  • the impact devices of the loading shovel which are not required while the loader is moving, are not subjected to any action in this first position of the main control valve. If the loader has reached the lowering shock or the rock with the edge of its loading shovel, the operator or automatically due to the increased load pressure on the traction motors switches the main control valve to its second position, with the result that the impact devices are now switched from the pump with the higher one Power is applied so that the smashing and loosening work can be carried out.
  • the cylinder-piston units of the charger are connected to this pump stage.
  • the traction motors are in this second position of the main control valve in connection with the pump with the low power, so that the loader only moves at a low driving speed, which is however completely sufficient during the loosening or loading work.
  • the pump with higher power with 2 and the pump with lower power with 3 is designated.
  • the two pumps 2, 3 are connected to the main control valve 4.
  • the pump 2 with the higher output is connected to the control valve 5 for the driving motors of the loader (not shown), while the pump 3 with the lower output is connected to the control valve 6 for the individual cylinders.
  • Piston units of the loader is connected.
  • the connection to the control valve 7 for the impact devices of the loading shovel of the loader is depressurized because these are not required during the movement of the loader.
  • the pump 2 with the higher output to the control valves 6 and 7 is once for the cylinder-piston units and the other for the impact devices switched on, so that they are subjected to the higher power, especially the impact devices, which they need to loosen and smash.
  • the pump 3 with the lower power is connected in the position to the control valve 5 for the driving motors, so that the loader can only be moved at a lower driving speed.
  • the main control slide 4 is switched back to its first position, so that the starting situation described above results.
  • the traction motors are again acted upon by the pump 2 with the higher power, ie the loader can be moved to the unloading point at high speed while the Impact devices are completely switched off and the cylinder-piston units of the loader are acted upon by the pump 3 with the low power.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

In order to obtain a switching arrangement of the hydraulic supply of aggregates of a loader, such as traction motors, bucket loaders fitted with crushers, cylinder and piston units and the like, which can cover all loading needs for which a loader is required in practice, at any time and with a minimum of equipment, the present switching arrangement comprises a pair of pumps having different powers. Said pumps (2, 3) are coupled to a main control valve (4) which, in its first position, connects the pump (2) having a higher power to the control valve (5) of the traction motors and the pump (3) of lesser power to the control valve (6) of the cylinder and piston unit. In its second position, the main control valve (4) connects the pump (2) of higher power to the control valves (6, 7) of the cylinder and piston units and of the crushers, and the pump (3) of lesser power to the control valve (5) of the traction motors.

Description

Die Erfindung betrifft eine Schaltungsanordnung für die hydraulische Beaufschlagung der Aggregate eines Laders, wie Fahrmotoren, mit Schlaggeräten bestückte Ladeschaufel, Zylinder-Kolben-Einheiten od. dgl.The invention relates to a circuit arrangement for the hydraulic loading of the units of a loader, such as traction motors, loading shovel equipped with impact devices, cylinder-piston units or the like.

Derartige Lader finden vorteilhaft Verwendung zum Sohlennachriss in Grubenräumen; jedoch sind diese auch für die Durchführung von Arbeiten Übertage geeignet.Loaders of this type are advantageously used for treading the sole in pit rooms; however, these are also suitable for performing work above ground.

Es sind Lader bekannt, welche für jede Verbrauchergruppe, wie Fahrmotore, Zylinder-Kolben-Arbeitszylinder sowie für die Schlaggeräte der Ladeschaufel je eine eigene Energiequelle in Form einer Pumpe aufweisen. Es ist bekannt, diese Pumpen leistungsgeregelt für die Vorfahrmotoren oder druckgeregelt für die Zylinder-Kolben-Einheiten sowie die Schlaggeräte auszuführen, um diese dem jeweiligen Bedarf anpassen zu können. Diese bekannte Lösung erweist sich jedoch als nachteilig, weil die gesamte installierte Leistung sehr hoch ist, weil diese aus der Summe aller installierten Pumpen sich ergibt, für die Leistung vorgehalten werden muss. Somit ist die gesamte Installation sehr kosten- und platzaufwendig.Loaders are known which each have their own energy source in the form of a pump for each consumer group, such as traction motors, cylinder-piston working cylinders and for the impact devices of the loading shovel. It is known to design these pumps in a power-controlled manner for the ancillary motors or in a pressure-controlled manner for the cylinder-piston units and the impact devices in order to be able to adapt them to the respective requirements. However, this known solution proves to be disadvantageous because the total installed power is very high, because it results from the sum of all installed pumps, for which power must be kept available. The entire installation is therefore very costly and space-consuming.

Aus der US-A-3606049 ist eine Schaltungsanordnung für einen Lader gemäss dem Oberbegriff des Anspruchs 1 bekannt.A circuit arrangement for a charger according to the preamble of claim 1 is known from US-A-3606049.

Von diesem Stand der Technik ausgehend liegt der Erfindung die Aufgabe zugrunde, eine Schaltungsanordnung der eingangs genannten Art zu schaffen, welche es mit einem Minimum an installierter Leistung ermöglicht, alle in der Praxis eines Laders auftretenden Belastungsfälle zu jedem Arbeitszeitpunkt voll abzudecken.Based on this prior art, the invention has for its object to provide a circuit arrangement of the type mentioned, which allows with a minimum of installed power to fully cover all load cases occurring in the practice of a loader at any time.

Erfindungsgemäss wird dies dadurch erreicht, dass die Pumpen auf ein Hauptsteuerventil geschaltet sind, in dessen erster Stellung die Pumpe mit der höheren Leistung mit dem Steuerventil für die Fahrmotoren und die Pumpe mit der niedrigeren Leistung mit dem Steuerventil für die Zylinder-Kolben-Einheiten od. dgl. verbunden ist, während in der zweiten Stellung des Hauptsteuerventils die Pumpe mit der höheren Leistung mit den Steuerventilen für die Zylinder-Kolben-Einheiten od. dgl. sowie die Schlaggeräte der Ladeschaufel und die Pumpe mit der niedrigeren Leistung mit dem Steuerventil für die Fahrmotoren in Verbindung steht. Durch diese Ausgestaltung wird erreicht, dass während der Fahrt des Laders die Pumpe mit der höheren Leistung die Fahrmotore beaufschlagt, d.h. der Lader mit grosser Geschwindigkeit fährt, während gleichzeitig über die Pumpe mit der niedrigeren Leistung die Zylinder-Kolben-Einheiten gespeist werden. Die Schlaggeräte der Ladeschaufel, welche während der Fahrt des Laders nicht benötigt werden, unterliegen in dieser ersten Stellung des Hauptsteuerventils keiner Beaufschlagung. Hat der Lader mit der Kante seiner Ladeschaufel den Senkstoss oder das Gestein erreicht, wird durch den Bedienungsmann oder selbsttätig durch den erhöhten Lastdruck an den Fahrmotoren das Hauptsteuerventil in seine zweite Stellung umgeschaltet, mit der Folge, dass nunmehr die Schlaggeräte von der Pumpe mit der höheren Leistung beaufschlagt werden, so dass die Zertrümmerungs- und Lösearbeiten durchgeführt werden können. Ausserdem sind die Zylinder-Kolben-Einheiten des Laders an diese Pumpenstufe angeschlossen. Die Fahrmotoren hingegen stehen in dieser zweiten Stellung des Hauptsteuerventils mit der Pumpe mit der niedrigen Leistung in Verbindung, so dass der Lader sich nur mit kleiner Fahrgeschwindigkeit bewegt, welche jedoch während der Löse- bzw. Ladearbeiten völlig ausreichend ist.According to the invention this is achieved in that the pumps are connected to a main control valve, in the first position of which the pump with the higher output with the control valve for the traction motors and the pump with the lower output with the control valve for the cylinder-piston units or. Like. Is connected, while in the second position of the main control valve, the pump with the higher power with the control valves for the cylinder-piston units or the like. As well as the impact devices of the loading shovel and the pump with the lower power with the control valve for the traction motors communicates. This configuration ensures that the pump applies the higher power to the traction motors while the loader is traveling, i.e. the loader runs at high speed, while at the same time the cylinder-piston units are fed by the pump with the lower output. The impact devices of the loading shovel, which are not required while the loader is moving, are not subjected to any action in this first position of the main control valve. If the loader has reached the lowering shock or the rock with the edge of its loading shovel, the operator or automatically due to the increased load pressure on the traction motors switches the main control valve to its second position, with the result that the impact devices are now switched from the pump with the higher one Power is applied so that the smashing and loosening work can be carried out. In addition, the cylinder-piston units of the charger are connected to this pump stage. The traction motors, however, are in this second position of the main control valve in connection with the pump with the low power, so that the loader only moves at a low driving speed, which is however completely sufficient during the loosening or loading work.

Wenn die Ladearbeit zu Ende ist, schaltet der Bedienungsmann die Schlaggeräte aus, wodurch das Hauptsteuerventil in seine erste Stellung zurückbewegt wird, in welcher die Pumpe mit der grösseren Leistung wieder auf die Fahrmotoren geschaltet ist und die Pumpe mit der geringeren Leistung wieder auf die Zylinder-Kolben-Einheiten ohne Beaufschlagung der Schlaggeräte. Der Lader kann nunmehr mit voller Geschwindigkeit an die Entladestelle fahren.When loading is over, the operator turns the strikers off, moving the main control valve back to its first position, in which the pump with the higher output is switched back to the traction motors and the pump with the lower output back to the cylinder. Piston units without impacting the impact devices. The loader can now drive to the unloading point at full speed.

Ein Ausführungsbeispiel der Erfindung ist an Hand der Zeichnung näher erläutert, und zwar zeigt diese in schematischer Darstellung die Schaltungsanordnung.An embodiment of the invention is explained in more detail with reference to the drawing, and this shows the circuit arrangement in a schematic representation.

Mit 1 ist der gemeinsame Antrieb der Doppelpumpe bezeichnet, deren Pumpe mit höherer Leistung mit 2 und deren Pumpe mit niedrigerer Leistung mit 3 bezeichnet ist. Die beiden Pumpen 2, 3 sind auf das Hauptsteuerventil 4 geschaltet. In der in der Figur gezeigten ersten Stellung des Hauptsteuerventils 4 ist die Pumpe 2 mit der höheren Leistung mit dem Steuerventil 5 für die nicht weiter dargestellten Fahrmotore des Laders verbunden, während die Pumpe 3 mit der niedrigeren Leistung mit dem Steuerventil 6 für die einzelnen Zylinder-Kolben-Einheiten des Laders verbunden ist. In dieser ersten Stellung des Hauptsteuerventils 4 ist die Verbindung zum Steuerventil 7 für die Schlaggeräte der Ladeschaufel des Laders drucklos, weil diese während des Verfahrens des Laders nicht benötigt werden.With 1 the common drive of the double pump is designated, the pump with higher power with 2 and the pump with lower power with 3 is designated. The two pumps 2, 3 are connected to the main control valve 4. In the first position of the main control valve 4 shown in the figure, the pump 2 with the higher output is connected to the control valve 5 for the driving motors of the loader (not shown), while the pump 3 with the lower output is connected to the control valve 6 for the individual cylinders. Piston units of the loader is connected. In this first position of the main control valve 4, the connection to the control valve 7 for the impact devices of the loading shovel of the loader is depressurized because these are not required during the movement of the loader.

Durch Umschaltung des Hauptsteuerschiebers 4 von Hand oder in Abhängigkeit vom Druck der Fahrmotore des Laders über die gestrichelt eingezeichnete Leitung 8 wird die Pumpe 2 mit der höheren Leistung an die Steuerventile 6 und 7 einmal für die Zylinder-Kolben-Einheiten und zum anderen für die Schlaggeräte angeschaltet, so dass diese mit der höheren Leistung beaufschlagt werden, insbesondere die Schlaggeräte, welche diese zum Lösen und Zertrümmern benötigen. Die Pumpe 3 mit der geringeren Leistung ist in der Stellung an das Steuerventil 5 für die Fahrmotore angeschlossen, so dass der Lader nur mit geringerer Fahrgeschwindigkeit verfahrbar ist.By switching the main control spool 4 by hand or depending on the pressure of the driving motors of the loader via the line 8 shown in broken lines, the pump 2 with the higher output to the control valves 6 and 7 is once for the cylinder-piston units and the other for the impact devices switched on, so that they are subjected to the higher power, especially the impact devices, which they need to loosen and smash. The pump 3 with the lower power is connected in the position to the control valve 5 for the driving motors, so that the loader can only be moved at a lower driving speed.

Durch Ausschalten der Schlaggeräte wird der Hauptsteuerschieber 4 wieder in seine erste Stellung zurückgeschaltet, so dass sich die vorstehend beschriebene Ausgangssituation ergibt. In dieser werden die Fahrmotore wieder von der Pumpe 2 mit der höheren Leistung beaufschlagt, d.h. der Lader kann mit hoher Fahrgeschwindigkeit an die Entladestelle verfahren werden, während die Schlaggeräte ganz abgeschaltet sind und die Zylinder-Kolben-Einheiten des Laders über die Pumpe 3 mit der geringen Leistung beaufschlagt werden.By switching off the impact devices, the main control slide 4 is switched back to its first position, so that the starting situation described above results. In this, the traction motors are again acted upon by the pump 2 with the higher power, ie the loader can be moved to the unloading point at high speed while the Impact devices are completely switched off and the cylinder-piston units of the loader are acted upon by the pump 3 with the low power.

Claims (3)

1. Circuit arrangement for applying hydraulic energy to the powered units of a loader, such as the propulsion motors, loading shovels which are fitted with percussion devices, cylinder-piston units or the like, which comprise a double-action pump (2, 3) having differing performance ratings, characterised in that the pumps (2, 3) are connected to a main control valve (4), in the first position of which the pump (2) of the greater output is connected to the control valve (5) for the propulsion motors while the pump (3) of lower output is connected to the control valve (6) for the cylinder-piston units, while in the second position of the main control valve (4) the pump (2) of higher output is connected to the control valves (6, 7) for the cylinder-piston units and the percussion means while the pump (3) of lower output is connected to the control valve (5) for the propulsion motors.
2. Circuit arrangement according to Claim 1, characterised in that switching of the main control valve (4) from its first position into its second position takes place as a function of the pressure of the propulsion motors.
3. Circuit arrangement according to Claim 1 or 2, characterised in that switching of the main control valve (4) from its second position to its first position takes place as a function of the shutdown of the percussion equipment.
EP19860903295 1985-05-08 1986-04-19 Switching arrangement for the hydraulic supply of aggregate of a loader Expired EP0227716B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3516429 1985-05-08
DE19853516429 DE3516429A1 (en) 1985-05-08 1985-05-08 CIRCUIT ARRANGEMENT FOR HYDRAULIC APPLICATION OF THE AGGREGATE OF A LOADER

Publications (2)

Publication Number Publication Date
EP0227716A1 EP0227716A1 (en) 1987-07-08
EP0227716B1 true EP0227716B1 (en) 1989-02-08

Family

ID=6270065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860903295 Expired EP0227716B1 (en) 1985-05-08 1986-04-19 Switching arrangement for the hydraulic supply of aggregate of a loader

Country Status (4)

Country Link
EP (1) EP0227716B1 (en)
DE (1) DE3516429A1 (en)
SU (1) SU1595347A3 (en)
WO (1) WO1986006772A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102536931A (en) * 2011-12-23 2012-07-04 航天长征化学工程股份有限公司 Reversal hydraulic driving system of raking machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3728994A1 (en) * 1987-08-29 1989-03-09 Piv Antrieb Reimers Kg Werner Arrangement for supplying a main consumer with hydraulic pressure medium
DE19717708C2 (en) * 1997-04-18 1999-11-18 Mannesmann Ag Hydraulic drive for a mobile implement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3606049A (en) * 1969-11-12 1971-09-20 Harnischfeger Corp Horsepower limiting hydraulic control circuit
BE794481A (en) * 1972-01-24 1973-05-16 Kubota Ltd MECHANICAL SHOVEL FOR EARTH MOVING WORKS
FR2250908B3 (en) * 1973-11-14 1977-08-12 Massey Ferguson Services Nv
JPS6129813Y2 (en) * 1980-07-07 1986-09-02

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102536931A (en) * 2011-12-23 2012-07-04 航天长征化学工程股份有限公司 Reversal hydraulic driving system of raking machine

Also Published As

Publication number Publication date
EP0227716A1 (en) 1987-07-08
WO1986006772A1 (en) 1986-11-20
SU1595347A3 (en) 1990-09-23
DE3516429A1 (en) 1986-11-13

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