EP0110876B1 - Method and control device for a hydraulic hammer - Google Patents

Method and control device for a hydraulic hammer Download PDF

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Publication number
EP0110876B1
EP0110876B1 EP82901863A EP82901863A EP0110876B1 EP 0110876 B1 EP0110876 B1 EP 0110876B1 EP 82901863 A EP82901863 A EP 82901863A EP 82901863 A EP82901863 A EP 82901863A EP 0110876 B1 EP0110876 B1 EP 0110876B1
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EP
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Prior art keywords
pressure
ram
lifting
chamber
pump
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EP82901863A
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German (de)
French (fr)
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EP0110876A1 (en
Inventor
Gavril Axinti
Stefanica Arama
Ionel Draghici
Polidor Bratu
Corneliu Stanciu
Aurelian Ghinea
Florin Badulescu
Christian Diaconu
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INTREPRINDEREA DE UTILAJ GREU 'PROGRESUL'
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INTREPRINDEREA DE UTILAJ GREU 'PROGRESUL'
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/18—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid
    • B06B1/183—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid operating with reciprocating masses

Definitions

  • the invention relates to a method and a device for controlling the cyclical movement of a percussion piston in a hydraulic percussion cylinder according to the preamble of patent claim 1 and the preamble of patent claim 2.
  • the invention is based on the object of developing the above-mentioned method and the above-mentioned device in such a way that the control can be easily adapted to different working conditions.
  • this object is achieved on the process side by the features characterized in patent claim 1 and on the device side by the features characterized in patent claim 2.
  • the cyclic movement of the percussion piston in a hydraulic percussion cylinder is controlled as a function of the pressure of a working memory, the pump or supply pressure and a functionally appropriate control of the valves provided for the lifting and lowering phase.
  • the functional parameters be easily adapted to different working conditions, but also high impact frequencies can be achieved because the control of the impact piston no longer depends on the position of the impact piston in the hydraulic impact cylinder and the position of an associated control slide, but directly depends on the pressures that are present in the pressure medium circuits of the hydraulic impact cylinder.
  • intermediate and limit pressures are used in a favorable manner, which depend on the pressure of the pump and the pressure of the pressure accumulator, with the pressure in the pressure accumulator being stored in the accumulator filling phase until the end of the braking phase, in addition to the pressure of the pump, advantageously for lowering the percussion piston is exploited.
  • the drawing shows the schematic representation of a device for controlling the cyclical movement of a percussion piston 1 in a hydraulic percussion cylinder 2.
  • the percussion piston 1 consists of a cylindrical section which is delimited by a return stroke surface a and by a first working surface e. Cylinder sections with different smaller diameters are formed on the return stroke surface a and on the first work surface b. The return stroke area a is smaller than the working area b.
  • the cylinder formed on the first work surface b ends in a second work surface c. Above the working surface c, a storage chamber d is formed in the striking cylinder 2, which is delimited by the second working surface c of the striking piston 1.
  • the first working surface b of the percussion piston delimits a working chamber b formed with the hydraulic percussion cylinder 2, and the return stroke area a delimits a lifting chamber f formed in the percussion cylinder 2.
  • the percussion piston 1 is shown for the sake of simplicity with a lateral distance between its cylinder surfaces and the percussion cylinder 2.
  • a pump 3 is connected to a controllable valve 4 and a controllable valve 8 via a pressure medium line.
  • the pump 3 delivers pressure medium from a pressure medium container 6.
  • a return line opens into the pressure medium container 6 and is connected to a controlled valve 7, which is provided for relieving the pressure in the working chamber e via a line h, a check valve 9, a controlled valve 11 , which is provided via a line e for pressure relief of the lifting chamber f, and with a pressure accumulator 12.
  • the controlled valve 8 is also connected to a pressure accumulator 5 and a further controlled valve 10, through which the working chamber e can be pressurized via the line h.
  • a line g opening into the storage chamber d is connected to the pressure accumulator 5, the controlled valve 8 and the controlled valve 10.
  • a hydraulic control device 13 is connected to the controlled valves 4, 7, 8, 10 and 11 via schematically illustrated control lines and has a schematically illustrated signal input for the pressure of the pressure accumulator 5.
  • the hydraulic control device 13, the controlled valves 4, 7, 8, 10 and 11, the non-return valve 9 and the lines connecting the elements mentioned are installed in a component 14 which connects to the housing of the impact cylinder 2 via lines i, h and g are connected.
  • the connection between the pump 3 and the component 14 is established by a flexible line 16, while a flexible line 17 is provided for the return from the component 14 and the pressure accumulator 12. Also shown is a part of a tool 18 protruding into a housing of the percussion cylinder 2, on which the percussion piston 1 acts.
  • the method according to the invention for controlling the cyclical movement of the percussion piston 1 in the hydraulic percussion cylinder 2 results from the subsequent description of the Mode of action.
  • the valves 8, 10 and 11 designed as open-close valves are closed by the hydraulic control device.
  • the lifting chamber f is pressurized by the pressure line i with the pressure of the pump 3, while the working chamber e is relieved of pressure via the line h and the open valve 7 to the container 6.
  • the hydraulic control device 13 Before the percussion piston 1 has carried out the entire stroke in the percussion cylinder 2, a predetermined pressure is reached in the pressure accumulator 5, which pressure is sensed by the hydraulic control device 13. The hydraulic control device 13 then closes the valve 4 and opens the valve 8. As a result, further pressure medium is fed into the pressure accumulator 5 and the percussion piston 1 is braked. In order to secure the filling of the lifting chamber f, the check valve 9, which is connected to the container 6, is used in this last phase.
  • the pump 3 continues to deliver pressure medium into the accumulator 5 until a predetermined maximum pressure for the accumulator 5 is reached.
  • This pressure is also sensed by the hydraulic control device 13.
  • the working phase of the percussion piston 1 begins, the valves 7 and 4 being closed by the hydraulic control device and the working chamber e and the storage chamber d being acted upon by the pressure of the pressure accumulator 5 and by the pressure of the pump 3, while the lifting chamber f is relieved of pressure via the valve 11 in the container 6.
  • the pressure accumulator 12 is provided in the return circuit.

Abstract

The control devices of this type are used in power shovels or as independent installations. The control device comprises hydraulic, logic binary elements which are controlled by the output signals of a hydraulic processor which analyses the signals from a tank and a pressure generator and which provides the working liquid to the jack for the lifting of lowering thereof. The control device is used in power shovels or as a self-contained installation for executing various operations, such as the beating of piles, the extraction of overhanging rocks in the mining industry, the removal of slag in casting ladles, etc.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Steuerung der zyklischen Bewegung eines Schlagkolbens in einem hydraulischen Schlagzylinder gemäss dem Oberbegriff des Patentanspruchs 1 bzw. dem Oberbegriff des Patentanspruchs 2.The invention relates to a method and a device for controlling the cyclical movement of a percussion piston in a hydraulic percussion cylinder according to the preamble of patent claim 1 and the preamble of patent claim 2.

Ein derartiges Verfahren und eine derartige Vorrichtung sind bereits aus der DE-B-1 299 922 zu entnehmen. Bei dieser vorbekannten Steuerung wird ein Steuerschieber verwendet, der den Schlagkolben über Steuerkanten ansteuert. Als Nachteil ist bei dieser vorbekannten Steuerung anzusehen, dass sich die Funktionsparameter schwer an verschiedene Arbeitsbedingungen des Schlagzylinders anpassen lassen und dass aufgrund der konzeptionsbedingten grossen Reaktionszeiten des Steuerprinzips nur begrenzte Schlagfrequenzen mit dem Schlagkolben erzielt werden können.Such a method and such a device can already be found in DE-B-1 299 922. In this known control, a control slide is used which controls the percussion piston via control edges. A disadvantage of this known control is that the functional parameters are difficult to adapt to different working conditions of the percussion cylinder and that due to the design-related long reaction times of the control principle, only limited percussion frequencies can be achieved with the percussion piston.

Der Erfindung liegt die Aufgabe zugrunde, das eingangs genannte Verfahren und die eingangs genannte Vorrichtung derart weiterzubilden, dass die Steuerung leicht an verschiedene Arbeitsbedingungen angepasst werden kann.The invention is based on the object of developing the above-mentioned method and the above-mentioned device in such a way that the control can be easily adapted to different working conditions.

Erfindungsgemäss wird diese Aufgabe verfahrensseitig durch die im Patentanspruch 1 gekennzeichneten Merkmale und vorrichtungsseitig durch die im Patentanspruch 2 gekennzeichneten Merkmale gelöst.According to the invention, this object is achieved on the process side by the features characterized in patent claim 1 and on the device side by the features characterized in patent claim 2.

Gemäss der Erfindung erfolgt im Unterschied zum eingangs erwähnten Stand der Technik eine Steuerung der zyklischen Bewegung des Schlagkolbens in einem hydraulischen Schlagzylinder abhängig von dem Druck eines Arbeitsspeichers, dem Pumpen- bzw. Versorgungsdruck und einer funktionsentsprechenden Ansteuerung der vorgesehenen Ventile für die Hub- und Senkphase. In vorteilhafter Weise lassen sich aufgrund der erfindungsgemässen Steuerkonzeption nicht nur die Funktionsparameter leicht an verschiedene Arbeitsbedingungen anpassen, sondern auch hohe Schlagfrequenzen erzielen, weil die Steuerung des Schlagkolbens nicht mehr von der Stellung des Schlagkolbens in dem hydraulischen Schlagzylinder und der Stellung eines zugeordneten Steuerschiebers, sondern unmittelbar von den Drücken abhängt, die in den Druckmittelkreisen des hydraulischen Schlagzylinders vorhanden sind. Dabei werden in günstiger Weise Zwischen-und Grenzdrücke verwendet, die von dem Druck der Pumpe und dem Druck des Druckspeichers abhängen, wobei vorteilhaft zum Senken des Schlagkolbens zusätzlich zu dem Druck der Pumpe noch der in der Speicherfüllphase bis zum Ende der Bremsphase gespeicherte Druck im Druckspeicher ausgenutzt wird.According to the invention, in contrast to the prior art mentioned at the outset, the cyclic movement of the percussion piston in a hydraulic percussion cylinder is controlled as a function of the pressure of a working memory, the pump or supply pressure and a functionally appropriate control of the valves provided for the lifting and lowering phase. Advantageously, due to the control concept according to the invention, not only can the functional parameters be easily adapted to different working conditions, but also high impact frequencies can be achieved because the control of the impact piston no longer depends on the position of the impact piston in the hydraulic impact cylinder and the position of an associated control slide, but directly depends on the pressures that are present in the pressure medium circuits of the hydraulic impact cylinder. In this case, intermediate and limit pressures are used in a favorable manner, which depend on the pressure of the pump and the pressure of the pressure accumulator, with the pressure in the pressure accumulator being stored in the accumulator filling phase until the end of the braking phase, in addition to the pressure of the pump, advantageously for lowering the percussion piston is exploited.

Nachfolgend wird die Erfindung anhand eines Ausführungsbeispiels unter Bezugnahme auf die beigefügte Zeichnung näher erläutert.The invention is explained in more detail below using an exemplary embodiment and with reference to the accompanying drawing.

Die Zeichnung zeigt die schematische Darstellung einer Vorrichtung zur Steuerung der zyklischen Bewegung eines Schlagkolbens 1 in einem hydraulischen Schlagzylinder 2. Der Schlagkolben 1 besteht aus einem zylinderförmigen Abschnitt, der von einer Rückhubfläche a und von einer ersten Arbeitsfläche e begrenzt wird. An der Rückhubfläche a und an der ersten Arbeitsfläche b sind jeweils Zylinderabschnitte mit unterschiedlichen kleineren Durchmessern angeformt. Die Rückhubfläche a ist kleiner als die Arbeitsfläche b. Der an der ersten Arbeitsfläche b angeformte Zylinder endet in einer zweiten Arbeitsfläche c. Oberhalb der Arbeitsfläche c ist in dem Schlagzylinder 2 eine Speicherkammer d gebildet, die von der zweiten Arbeitsfläche c des Schlagkolbens 1 begrenzt ist. Die erste Arbeitsfläche b des Schlagkolbens begrenzt eine mit dem hydraulischen Schlagzylinder 2 gebildete Arbeitskammer b, und die Rückhubfläche a begrenzt eine in dem Schlagzylinder 2 gebildete Hubkammer f.The drawing shows the schematic representation of a device for controlling the cyclical movement of a percussion piston 1 in a hydraulic percussion cylinder 2. The percussion piston 1 consists of a cylindrical section which is delimited by a return stroke surface a and by a first working surface e. Cylinder sections with different smaller diameters are formed on the return stroke surface a and on the first work surface b. The return stroke area a is smaller than the working area b. The cylinder formed on the first work surface b ends in a second work surface c. Above the working surface c, a storage chamber d is formed in the striking cylinder 2, which is delimited by the second working surface c of the striking piston 1. The first working surface b of the percussion piston delimits a working chamber b formed with the hydraulic percussion cylinder 2, and the return stroke area a delimits a lifting chamber f formed in the percussion cylinder 2.

In der schematischen Darstellung ist der Schlagkolben 1 aus Vereinfachungsgründen mit seitlichem Abstand seiner Zylinderflächen zu dem Schlagzylinder 2 dargestellt.In the schematic representation, the percussion piston 1 is shown for the sake of simplicity with a lateral distance between its cylinder surfaces and the percussion cylinder 2.

Eine Pumpe 3 ist über eine Druckmittelleitung mit einem steuerbaren Ventil 4 und einem steuerbaren Ventil 8 verbunden. Die Pumpe 3 fördert Druckmittel aus einem Druckmittelbehälter 6. In den Druckmittelbehälter 6 mündet eine Rücklaufleitung, die in Verbindung steht mit einem gesteuerten Ventil 7, das für die Druckentlastung der Arbeitskammer e über eine Leitung h vorgesehen ist, einem Rückschlagventil 9, einem gesteuerten Ventil 11, das über eine Leitung e zur Druckentlastung der Hubkammer f vorgesehen ist, und mit einem Druckspeicher 12.A pump 3 is connected to a controllable valve 4 and a controllable valve 8 via a pressure medium line. The pump 3 delivers pressure medium from a pressure medium container 6. A return line opens into the pressure medium container 6 and is connected to a controlled valve 7, which is provided for relieving the pressure in the working chamber e via a line h, a check valve 9, a controlled valve 11 , which is provided via a line e for pressure relief of the lifting chamber f, and with a pressure accumulator 12.

Das gesteuerte Ventil 8 ist weiterhin mit einem Druckspeicher 5 und einem weiteren gesteuerten Ventil 10 verbunden, durch welches die Arbeitskammer e über die Leitung h mit Druck beaufschlagbar ist. Eine in die Speicherkammer d mündende Leitung g ist mit dem Druckspeicher 5, dem gesteuerten Ventil 8 und dem gesteuerten Ventil 10 verbunden.The controlled valve 8 is also connected to a pressure accumulator 5 and a further controlled valve 10, through which the working chamber e can be pressurized via the line h. A line g opening into the storage chamber d is connected to the pressure accumulator 5, the controlled valve 8 and the controlled valve 10.

Eine hydraulische Steuereinrichtung 13 ist über schematisch dargestellte Steuerleitungen mit den gesteuerten Ventilen 4, 7, 8, 10 und 11 verbunden und weist einen schematischen dargestellten Signaleingang für den Druck des Druckspeichers 5 auf. Die hydraulische Steuereinrichtung 13, die gesteuerten Ventile 4, 7, 8, 10 und 11, das Rückschlagventil 9 sowie die die genannten Elemente verbindenden Leitungen sind in einem Bauelement 14 eingebaut, das über die Leitungen i, h und g mit dem Gehäuse des Schlagzylinders 2 verbunden sind. Die Verbindung zwischen der Pumpe 3 und dem Bauelement 14 wird durch eine biegsame Leitung 16 hergestellt, während eine biegsame Leitung 17 für den Rücklauf aus dem Bauelement 14 und dem Druckspeicher 12 vorgesehen ist. Dargestellt ist ferner ein Teil eines in ein Gehäuse des Schlagzylinders 2 hineinragenden Werkzeugs 18, auf das der Schlagkolben 1 einwi rkt.A hydraulic control device 13 is connected to the controlled valves 4, 7, 8, 10 and 11 via schematically illustrated control lines and has a schematically illustrated signal input for the pressure of the pressure accumulator 5. The hydraulic control device 13, the controlled valves 4, 7, 8, 10 and 11, the non-return valve 9 and the lines connecting the elements mentioned are installed in a component 14 which connects to the housing of the impact cylinder 2 via lines i, h and g are connected. The connection between the pump 3 and the component 14 is established by a flexible line 16, while a flexible line 17 is provided for the return from the component 14 and the pressure accumulator 12. Also shown is a part of a tool 18 protruding into a housing of the percussion cylinder 2, on which the percussion piston 1 acts.

Das erfindungsgemässe Verfahren zur Steuerung der zyklischen Bewegung des Schlagkolbens 1 in dem hydraulischen Schlagzylinder 2 ergibt sich aus der anschliessenden Beschreibung der Wirkungsweise. Wenn sich der Schlagkolben 1 in seiner untersten Stellung befindet, in der er auf dem Werkzeug 18 ruht, und aus dieser Stellung angehoben werden soll, werden durch die hydraulische Steuereinrichtung die als Auf- Zu- Ventile ausgebildeten Ventile 8, 10 und 11 geschlossen. Durch das geöffnete Ventil 4 wird die Hubkammer f durch die Druckleitung i mit dem Druck der Pumpe 3 beaufschlagt, während die Arbeitskammer e über die Leitung h und das offene Ventil 7 zu dem Behälter 6 druckentlastet wird. Durch den Druckanstieg in der Druckkammer f, die von der Rückhubfläche a des Schlagkolbens begrenzt wird, welche grösser ist als die zweite Arbeitsfläche c, bewegt sich der Schlagkolben 1 in einer Hubphase von dem Werkzeug 18 nach oben. Dabei erfolgt über die Leitung g ein Ausschieben des in der Speicherkammer d enthaltenen Druckmittels in den Druckspeicher 5.The method according to the invention for controlling the cyclical movement of the percussion piston 1 in the hydraulic percussion cylinder 2 results from the subsequent description of the Mode of action. When the percussion piston 1 is in its lowermost position in which it rests on the tool 18 and is to be lifted out of this position, the valves 8, 10 and 11 designed as open-close valves are closed by the hydraulic control device. Through the opened valve 4, the lifting chamber f is pressurized by the pressure line i with the pressure of the pump 3, while the working chamber e is relieved of pressure via the line h and the open valve 7 to the container 6. Due to the pressure increase in the pressure chamber f, which is limited by the return stroke area a of the percussion piston, which is larger than the second working area c, the percussion piston 1 moves upwards from the tool 18 in a stroke phase. The pressure medium contained in the storage chamber d is pushed out into the pressure accumulator 5 via the line g.

Bevor der Schlagkolben 1 den gesamten Hub in dem Schlagzylinder 2 durchgeführt hat, wird in dem Druckspeicher 5 ein vorbestimmter Druck erreicht, der von der hydraulischen Steuereinrichtung 13 abgefühlt wird. Die hydraulische Steuereinrichtung 13 schliesst dann das Ventil 4 und öffnet das Ventil 8. Hierdurch wird weiteres Druckmittel in den Druckspeicher 5 geleitet und der Schlagkolben 1 gebremst. Um die Füllung der Hubkammer f zu sichern, kommt in dieser letzten Phase das Rückschlagventil 9 zum Einsatz, das mit dem Behälter 6 verbunden ist.Before the percussion piston 1 has carried out the entire stroke in the percussion cylinder 2, a predetermined pressure is reached in the pressure accumulator 5, which pressure is sensed by the hydraulic control device 13. The hydraulic control device 13 then closes the valve 4 and opens the valve 8. As a result, further pressure medium is fed into the pressure accumulator 5 and the percussion piston 1 is braked. In order to secure the filling of the lifting chamber f, the check valve 9, which is connected to the container 6, is used in this last phase.

Wenn der Schlagkolben 1 den gesamten Hub zurückgelegt hat, fördert die Pumpe 3 weiterhin Druckmittel in den Speicher 5, bis ein vorbestimmter maximaler Druck für den Speicher 5 erreicht wird. Auch dieser Druck wird von der hydraulischen Steuereinrichtung 13 abgefühlt. Bei Erreichen dieses Druckes beginnt die Arbeitsphase des Schlagkolbens 1, wobei durch die hydraulische Steuereinrichtung die Ventile 7 und 4 geschlossen werden und die Arbeitskammer e und die Speicherkammer d durch den Druck des Druckspeichers 5 und durch den Druck der Pumpe 3 beaufschlagt werden, während die Hubkammer f über das Ventil 11 in den Behälter 6 druckentlastet wird. Hierdurch wird eine maximale Schlagwirkung beim Senken des Schlagkolbens 1 erreicht. Da in der Arbeitsphase eine grössere Druckmittelmenge aus der Hubkammer f abzuführen ist, ist der Druckspeicher 12 im Rücklaufkreis vorgesehen.When the percussion piston 1 has covered the entire stroke, the pump 3 continues to deliver pressure medium into the accumulator 5 until a predetermined maximum pressure for the accumulator 5 is reached. This pressure is also sensed by the hydraulic control device 13. When this pressure is reached, the working phase of the percussion piston 1 begins, the valves 7 and 4 being closed by the hydraulic control device and the working chamber e and the storage chamber d being acted upon by the pressure of the pressure accumulator 5 and by the pressure of the pump 3, while the lifting chamber f is relieved of pressure via the valve 11 in the container 6. As a result, a maximum impact effect when lowering the impact piston 1 is achieved. Since a larger amount of pressure medium is to be discharged from the lifting chamber f in the working phase, the pressure accumulator 12 is provided in the return circuit.

Claims (2)

1. A method for controlling of the cyclical movement of a ram (1) within an hydraulic rammer cylinder (2), comprising a lifting chamber (f), which is limited by a return lifting surface (a) of the ram (1), a working chamber (e), which is limited by a first working surface (b) of the ram (1), and an accumulator chamber (d), which is limited by a second working surface (c) of the ram (1), wherein for lifting the ram (1) the lifting chamber (f) is pressurized by the pressure of a pump (3) and the pressure of the working chamber (e) is released, and wherein for lowering the ram (1) the working chamber (e) and the accumulator chamber (d) are pressurized by the pressure of the pressure storage (5) and by the pressure of the pump (3) and the pressure of the lifting chamber (f) is released, characterized in that for lifting the ram (1) pressure of the working chamber (e) is released through a controlled valve (7) and is pressurized for lowering the ram (1) through a controlled valve (10); that the accumulator chamber (d) is pressurized by the pressure of the pump (3) through a controlled valve (8) for lowering the ram (1); that the pressure of the lifting chamber (f) is released through a controlled valve (11) with the lowering of the ram (1); and that the control of the movement of the ram (1) is preformed as a function of predetermined pressure conditions of the pressure storage (5) and the pump (3) in a lifting phase, a storage fill phase and a working phase by an hydraulic control means (13) by the respective valve control, during the lifting phase the fluid being completely removed from the accumulator chamber (d) into the pressure storage (5), and at the end of the lifting phase the storage fill phase being simultaneously a braking phase for the movement of the ram (1), during which pressurizing of the lifting chamber (f) through a controlled valve (4) by the pressure of the pump (3) is interrupted and the pressure storage (5) is pressurized by removing the fluid from the accumulator chamber (d) and additionally by the pressure of the pump; and wherein it is switched to the working phase with the reaching of a predetermined maximal pressure in the pressure storage (5).
2. An apparatus for controlling the cyclical movement of the ram (1) in a hydraulic rammer cylinder (2), comprising a lifting chamber (f), which is limited by a return lifting surface (a) of the ram (1), a working chamber (e), which is limited by a first working surface (b) of the ram (1) and an accumulator chamber (d), which is limited by a second working surface (c) of the ram (1), wherein for lifting the ram (1) the lifting chamber (f) is pressurized by the pressure of a pump (3) and the pressure of the working chamber (e) is released, and wherein for lowering the ram (1) the working chamber (e) and the accumulator chamber (d) are pressurizable by the pressure of a pressure storage (5) and by the pressure of the pump (3) and the pressure of the lifting chamber (e) is releasable, characterized in that the pressure of the working chamber (e) is releasable through a controlled valve (7) with the lifting of the ram (1) and pressurizable for lowering the ram (1) through a controlled valve (10); that the accumulator chamber (d) is pressurizable through a controlled valve (8) by the pressure of the pump (3) for lowering the ram (1); that the lifting chamber (f) is pressurizable by the pressure of the pump (3) through a controlled valve (4) for lowering the ram (1) and that the pressure thereof is releasable through a controlled valve (11) for lowering the ram (1); and that there is a hydraulic control means (13) controling the valves (4, 7, 8, 11) in response of determined pressure conditions in the pressure storage (5) and the pump (3) for a lifting phase, a storage fill phase following the lifting phase after reaching the entire stroke of the ram (1), and for a working phase with the reaching of the pre-determined maximal pressure in the pressure storage (5), wherein at the end of the lifting phase the storage fill phase is simultaneously a braking phase for the movement of the ram (1), in which the pressurizing of the lifting chamber (f) by the pressure of the pump (3) is interrupted and pressurizing of the pressure storage (5) by removed fluid from the accumulator chamber (d) and additionally by the pressure of the pump (3) is provided.
EP82901863A 1982-06-08 1982-06-08 Method and control device for a hydraulic hammer Expired EP0110876B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/RO1982/000003 WO1983004427A1 (en) 1982-06-08 1982-06-08 Control device and method for hydraulic pulse generators

Publications (2)

Publication Number Publication Date
EP0110876A1 EP0110876A1 (en) 1984-06-20
EP0110876B1 true EP0110876B1 (en) 1987-10-07

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US (1) US4688468A (en)
EP (1) EP0110876B1 (en)
DE (1) DE3277448D1 (en)
FI (1) FI77724C (en)
WO (1) WO1983004427A1 (en)

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Also Published As

Publication number Publication date
US4688468A (en) 1987-08-25
FI840477A (en) 1984-02-06
EP0110876A1 (en) 1984-06-20
FI77724C (en) 1989-04-10
DE3277448D1 (en) 1987-11-12
FI77724B (en) 1988-12-30
WO1983004427A1 (en) 1983-12-22
FI840477A0 (en) 1984-02-06

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