EP0149967A1 - Hydraulically actuated percussion tool - Google Patents

Hydraulically actuated percussion tool Download PDF

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Publication number
EP0149967A1
EP0149967A1 EP84730125A EP84730125A EP0149967A1 EP 0149967 A1 EP0149967 A1 EP 0149967A1 EP 84730125 A EP84730125 A EP 84730125A EP 84730125 A EP84730125 A EP 84730125A EP 0149967 A1 EP0149967 A1 EP 0149967A1
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EP
European Patent Office
Prior art keywords
piston
control valve
valve
percussion
annular
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.)
Granted
Application number
EP84730125A
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German (de)
French (fr)
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EP0149967B1 (en
Inventor
Wilhelm Dipl.-Ing. Rode
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 & Soehne & Co KG GmbH
Original Assignee
Rudolf Hausherr & Sohne & Co KG GmbH
Mannesmann AG
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Publication date
Application filed by Rudolf Hausherr & Sohne & Co KG GmbH, Mannesmann AG filed Critical Rudolf Hausherr & Sohne & Co KG GmbH
Priority to AT84730125T priority Critical patent/ATE37315T1/en
Publication of EP0149967A1 publication Critical patent/EP0149967A1/en
Application granted granted Critical
Publication of EP0149967B1 publication Critical patent/EP0149967B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/145—Control devices for the reciprocating piston for hydraulically actuated hammers having an accumulator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/16—Valve arrangements therefor
    • B25D9/20—Valve arrangements therefor involving a tubular-type slide valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2209/00—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D2209/005—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously having a tubular-slide valve, which is coaxial with the piston

Definitions

  • the present invention relates to a hydraulically operated impact device according to the preamble of patent claim 1.
  • a hydraulically operated impact device in which the control valve is displaceable in one direction by the moving piston, responds to the movement of the piston in the opposite direction and is then actuated by the hydraulic fluid in such a way that it moves in the opposite direction due to hydrostatic pressure.
  • the control valve is arranged on the side facing the striking tool. This arrangement has the disadvantage that the mass of the valve has to be moved during the entire working stroke. This hinders the acceleration of the percussion piston.
  • control valve travels longer than the control piston. On the one hand, this means that it has to detach itself from the control piston, which takes place differently for objects to be struck differently and which does not always succeed with soft objects. The consequence of this is that the control valve and the percussion piston are out of action.
  • the long stroke of the control valve means that the stering valve must be caught. This leads to an undesired heating of the hydraulic medium. In addition, an undesired large oil volume is required to switch the control valve.
  • the control valve is guided inside and outside in order to obtain the chambers required for the return. Since tight manufacturing tolerances are required, high manufacturing costs will arise for this.
  • control valve on the percussion side will result in high wear due to transverse movements of the percussion piston if the impact tool is not centered on the percussion tool.
  • Another disadvantage is the mechanical contact between the percussion piston and the control valve. The result is high wear and tear due to the destruction of the control edges and the resulting obstruction of the switching process.
  • the object of the present invention is to provide a striking device of the type described at the outset, which adapts the speed of the control process to the nature of the object to be struck in a substantially simplified control system.
  • control valve consists of a simple sleeve without transverse bore, which is reversed hydraulically in the stroke stroke and mechanically in the upward stroke as a function of the path and speed of the impact piston.
  • the control valve is held hydraulically in defined positions in the housing, except during the changeover process.
  • the control channel to the control valve is released and remains open at the beginning of the backward movement.
  • the tool and the object to be struck could be viewed like a spring system.
  • the nature of the object has an impact on the rebound speed. If, for example, hard rock is struck, the path to a standstill of the piston is almost zero. In contrast to the impact on soft rock, hard rock results in a high rebound speed of the percussion piston and a momentary pressure increase in the oil column. Since this pressure is used to reverse the control valve, the reversing process for hard objects is faster as desired.
  • Another advantage of the invention is the simple structure of the impact device. Except for the control edges, the control valve has a diameter almost the same size as the cylinder of the percussion piston.
  • the housing has predominantly simple cylindrical bores for receiving the percussion piston.
  • the structure of the percussion piston is simple in terms of production technology and has the advantage that the contact surfaces to the housing are so far apart that no one strikes the percussion tool Wear of the piston guide occurs.
  • Another advantage of the striking device is the easy interchangeability of the piston. Since the diameter of the guide cylinder of the percussion piston is smaller than the inner diameter of the sleeve-shaped control valve, e.g. the percussion pistons can be replaced for maintenance purposes without dismantling the control valve.
  • the striking device consists of the housing 2, the striking piston 3 and the control valve 4, an impact tool 1, such as a chisel, drill or the like, being introduced axially into the housing on which the axially reciprocating percussion piston acts.
  • an impact tool 1 such as a chisel, drill or the like
  • Fig. 1 the percussion piston has carried out the blow.
  • the control edge 3.3 of the guide cylinder; 3 “has opened the mouth of the drain 7.1 of the connecting channel 7.
  • the pressure oil has reached the annular space 8.2 via the feed 7.2 and has moved the control valve 4 in the direction of the striking tool 1 via the annular surface of the control edge 4.3 and the annular surface of the control edge 4.6 of the control valve 4 against the ring surface 2.4 of the housing.
  • the 01 from the ring groove 5- “has reached the oil outlet 6 via the middle outlet 6.3 and the upper connection 6.4.
  • the annular space 5 '' is opened, so that pressure oil from the pressure inlet 5 via the annular surface of the control edge 4.4 ver the control valve in the" return stroke "position pushes.
  • the control valve 4 has released the upper annular groove 6 "and the lower annular groove 6 '.
  • the oil from your inner annular space 8.1 can flow out to the oil outlet 6 via the upper drain 6.5.
  • the control valve 4 blocks the annular groove 5" and thus in this position the supply of the pressure oil via the supply 5.3 to the annular surface of the control edge 3.3.
  • the pressure of the oil present in the annular space 8.3 holds the control valve 4 in position over the annular surface of the control edge 4.4.
  • the pressure oil reaching the lower annular space 5 'via connection 5.2 and the feed 5.1 acts on the annular surface 3.1 of the cylinder 3' and moves the percussion piston in the direction of the side of the piston facing away from the percussion tool.
  • the percussion piston 3 hits the control valve 4 (FIG. 5).
  • a part of the outer wall of the pin 3.4 is pushed into the inner bore 4.2 of the control valve 4.
  • the oil located between the surfaces of the outer wall of the pin 3.4 of the ring surface 3.3 of the housing inner wall 2.1 and the ring surface of the lower edge 4.1 of the control valve 4 is enclosed in the resulting annular space.
  • the overlapping surfaces between the pin 3.4 and the inner bore 4.2 and the middle cylinder 3 "and the housing inner bore 2.1 provide sufficient sealing.
  • the sealing surface which is formed by the outer surface 4.7 and the housing inner surface 2.1 becomes smaller when the control valve 4 moves back.
  • the pressure of the oil from the annular groove 5 ′′ is present in the annular space described above.
  • the oil on the pressure side acts on the annular surface 3.3 of the percussion piston 3 and brakes its movement.
  • the control valve moves to the "stroke stroke" position (Fig. 2).
  • the pressure-side oil passes through the control edge 4.1 of the control valve 4 into the inner annular space 8.1.
  • the percussion piston is accelerated moves in the direction of impact tool as to the annular surface 3.3 now the R i n gflache 3.5 in the impact direction is effective.
  • the oil of the middle annular groove 5 "'flows via the gleichsk d nal 7 and the annulus to 3.2 duslde oil. 6
  • the control valve 4 in the "stroke stroke” position.
  • the control valve 4 lies with the end face 4.5 on the annular surface 2.3 of the housing 2.
  • the outflow of the oil from the annular space 8.1 into the upper drain 6.5 and the annular groove 6 ′′ and 6 ′ is prevented.
  • the pressure oil passes through the supply 5.3 and the annular groove 5 "into the space 8.1 and thus onto the end face 3.5 and 3.3 facing away from the striking tool and via the feed 5.1 onto the end face 3.1 of the annular space 5 'facing the striking tool.
  • the percussion piston designed as a differential piston moves in the direction of the striking tool.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Manufacture Of Iron (AREA)
  • Actuator (AREA)

Abstract

A hydraulically operated impacting device includes a differential piston slidably disposed in a bore, and having an impacting surface and a piston rod facing at the other end a valve sleeve circumscribing the piston rod, there being an annular space between the rod and the valve, the valve having a first and a second position; a first duct leads from a pressure source to the bore and is governed by the valve for acting or not acting on the larger one of the two piston surfaces respectively in the first and second positions of the valve; a second duct leads from the source to the bore for acting on the smaller one of the piston surfaces; a third duct leads from the bore at a location below the valve to a ring chamber adjacent the valve, the valve having a collar which is movable in the ring chamber, the piston has a portion which depending on the position of the piston permits or prevents communication between the annular space and the third duct to obtain or not obtain pressurization of the ring chamber for shifting the valve from the first to the second position; the piston has a collar which may enter in part the annular space during a return stroke of the piston while the remainder of the collar and the bore establish a closed chamber so that upon continuation of the return stroke the piston shifts the valve from the second position into the first position in which the valve opens the first duct for obtaining a forward and impacting stroke.

Description

Die vorliegende Erfindung betrifft eine hydraulisch betätigte Schlagvorrichtung gemäß der Oberbegriff des Patentanspruchs 1.The present invention relates to a hydraulically operated impact device according to the preamble of patent claim 1.

Aus der DE-Os 25 17 213 ist eine hydraulisch betätigte Schlagvorrichtung bekannt, bei der das Steuerventil von dem sich bewegenden Kolben in einer Richtung verschiebbar ist, auf die Bewegung des Kolbens in entgegengesetzter Richtung anspricht und daraufhin von der Druckflüssigkeit derart betätigt wird, daß es sich durch hydrostatischen Druck in entgegengesetzte Richtung bewegt. Bei dieser Vorrichtung ist das Steuerventil auf der dem Schlagwerkzeug zugewandten Seite angeordnet. Diese Anordnung hat den Nachteil, daß während des gesamten Arbeitshubes die Masse des Ventils bewegt werden muß. Dies behindert die Beschleunigung des Schlagkolbens.From DE-OS 25 17 213 a hydraulically operated impact device is known in which the control valve is displaceable in one direction by the moving piston, responds to the movement of the piston in the opposite direction and is then actuated by the hydraulic fluid in such a way that it moves in the opposite direction due to hydrostatic pressure. In this device, the control valve is arranged on the side facing the striking tool. This arrangement has the disadvantage that the mass of the valve has to be moved during the entire working stroke. This hinders the acceleration of the percussion piston.

Außerdem legt das Steuerventil einen längeren Ueg zurück als der Steuerkolben. Das bedeutet zum einen, daß es sich vom Steuerkolben lösen muß, was bei unterschiedlich zu schlagenden Objekten sich verschieden vollzieht und bei weichen Objekten nicht immer gelingt. Die folge davon ist, daß das Steuerventil und der Schlagkolben außer Takt kommen.In addition, the control valve travels longer than the control piston. On the one hand, this means that it has to detach itself from the control piston, which takes place differently for objects to be struck differently and which does not always succeed with soft objects. The consequence of this is that the control valve and the percussion piston are out of action.

Der lange Ueg des Steuerventils bedeutet zum anderen, daß das Sterventil aufgefangen werden muß. Dies führt zu einer nicht gewünschten Erwärmung des hydraulischem Mediums. Außerdem ist zum Umschalten des Steuerventils ein nicht gewünschtes große Ölvolumen erforderlich.On the other hand, the long stroke of the control valve means that the stering valve must be caught. This leads to an undesired heating of the hydraulic medium. In addition, an undesired large oil volume is required to switch the control valve.

Das Steuerventil ist, um die zum Zurückführen erforderlichen Kammern zu erhalten, innen und außen geführt. Da enge Fertigungstoleranzen gefordert sind, werden hierfür hohe Fertigungskosten auftreten.The control valve is guided inside and outside in order to obtain the chambers required for the return. Since tight manufacturing tolerances are required, high manufacturing costs will arise for this.

Außerdem wird die Anordnung des Steuerventils zur Schlagwerkseite hin durch Querbewegungen des Schlagkolbens bei nichtzentrischem Auftreffen auf das Schlagwerkzeug zum hohen Verschleiß führen. Ein weiterer Nachteil ist die mechanische Berührung zwischen Schlagkolben und Steuerventil. Die Folge ist hoher Verschleiß durch Zerstörung der Steuerkanten und dadurch bedingte Behinderung des Umschaltvorganges.In addition, the arrangement of the control valve on the percussion side will result in high wear due to transverse movements of the percussion piston if the impact tool is not centered on the percussion tool. Another disadvantage is the mechanical contact between the percussion piston and the control valve. The result is high wear and tear due to the destruction of the control edges and the resulting obstruction of the switching process.

Die Aufgabe der vorliegenden Erfindung besteht darin, eine Schlagvorrichtung der eingangs geschilderten Art zu schaffen, die bei einem wesentlich vereinfachten Steuerungssystem die Geschwindigkeit des Steuervorganges der Beschaffenheit des zu schlagenden Objektes anpaßt.The object of the present invention is to provide a striking device of the type described at the outset, which adapts the speed of the control process to the nature of the object to be struck in a substantially simplified control system.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Hauptanspruchs gelöst. Vorteilhafte Weiterbildungen sind in den Unteransprüchen beschrieben. Nach der Erfindung besteht das Steuerventil aus einer einfachen querbohrungsfreien Hülse, die im Schlaghub hydraulisch und im Aufwärtshub mechanisch in Abhängigkeit des Weges und der Geschwindigkeit des Schlagkolbens umgesteuert wird. Das Steuerventil wird, außer während des Umschaltvorganges, hydraulisch in definierten Positionen im Gehäuse gehalten.This object is achieved according to the invention by the features of the main claim. Advantageous further developments are described in the subclaims. According to the invention, the control valve consists of a simple sleeve without transverse bore, which is reversed hydraulically in the stroke stroke and mechanically in the upward stroke as a function of the path and speed of the impact piston. The control valve is held hydraulically in defined positions in the housing, except during the changeover process.

Es ist nur ein Druckölsystem erforderlich.Only one pressure oil system is required.

Kurz vor dem Auftreffen des Schlagkolbens auf das Schlagwerkzeug wird der Steuerkanal zum Steuerventil freigegeben und bleibt zu Beginn der Rückwärtsbewegung offen. Werkzeug und zu schlagendes Objekt könnten theoretisch wie ein Federsystem betrachtet werden. Die Beschaffenheit des Objektes hat dabei einen Einfluß auf die Rückprallgeschwindigkeit. Wird beispielsweise auf hartes Gestein geschlagen, so ist der Weg zum Stillstand des Kolbens fast Null. Im Gegensatz zum Schlag auf Weichgestein entsteht bei hartem Gestein eine hohe Rückprall Geschwindigkeit des Schlagkolbens und ein momentaner Druckanstieg in der Ölsäule. Da dieser Druck zur Umsteuerung des Steuerventils eingesetzt wird, ist der Umsteuervorgang bei harten Objekten wunschgemäß schneller.Shortly before the impact piston hits the impact tool, the control channel to the control valve is released and remains open at the beginning of the backward movement. Theoretically, the tool and the object to be struck could be viewed like a spring system. The nature of the object has an impact on the rebound speed. If, for example, hard rock is struck, the path to a standstill of the piston is almost zero. In contrast to the impact on soft rock, hard rock results in a high rebound speed of the percussion piston and a momentary pressure increase in the oil column. Since this pressure is used to reverse the control valve, the reversing process for hard objects is faster as desired.

Ein weiterer Vorteil der Erfindung ist der einfache Aufbau der Schlagvorrichtung. Das Steuerventil hat bis auf die Steuerungskanten einen fast gleich großen Durchmesser wie der Zylinder des Schlagkolbens. Das Gehäuse besitzt damit überwiegend einfache zylindrische Bohrungen zur Aufnahme des Schlagkolbens.Another advantage of the invention is the simple structure of the impact device. Except for the control edges, the control valve has a diameter almost the same size as the cylinder of the percussion piston. The housing has predominantly simple cylindrical bores for receiving the percussion piston.

Durch die Anordnung des Steuerventils um die Kolbenstange des Schlagkolbens auf der dem Schlagwerkzeug abgewandten Seite ist der Aufbau des Schlagkolbens fertigungstechnisch einfach und hat dazu den Vorteil, daß die Auflageflächen zum Gehäuse hin so weit auseinander angeordnet sind, daß auch bei nichtzentrischem Schlag auf das Schlagwerkzeug kein Verschleiß der Kolbenführung eintritt.Due to the arrangement of the control valve around the piston rod of the percussion piston on the side facing away from the percussion tool, the structure of the percussion piston is simple in terms of production technology and has the advantage that the contact surfaces to the housing are so far apart that no one strikes the percussion tool Wear of the piston guide occurs.

Das Umschalten des Steuerventils vom "RÜckhub" auf "Schlaghub" wird durch den Schlagkolben am Ende seines Rückhubes mechanisch durchgeführt. Diese vorteilhafte direkte und exakte Führung des Steuerventils wird dazu noch verschleißfrei durchgeführt. Dies geschieht erfindungsgemäß dadurch, daß der Schlagkolben mit einem Zapfen in die Hülse des Steuerventils eindringt und damit Öl in einem Ringraum einschließt. Der Schlagkolben schiebt ohne direkten Kontakt mit dem hülsenförmigen Steuerventil dieses vor sich her. Kurz vor Erreichen der Position "Schlaghub" des Steuerventils wird der Schlagkolben durch das Drucköl abgebremst. Das nur mit geringer Geschwindigkeit sich bewegende Steuerventil trifft sanft auf die Stirnfläche des Gehäuses auf und wird über das Drucköl in einer Position gehalten.Switching the control valve from "return stroke" to "impact stroke" is carried out mechanically by the impact piston at the end of its return stroke. This advantageous direct and exact guidance of the control valve is also carried out without wear. This is done according to the invention in that the percussion piston penetrates into the sleeve of the control valve with a pin and thus includes oil in an annular space. The percussion piston pushes the sleeve-shaped control valve in front of it without direct contact. Shortly before reaching the "blow stroke" position of the control valve, the blow piston is braked by the pressure oil. The control valve, which only moves at low speed, hits the end face of the housing gently and is held in one position by the pressure oil.

Zum Umsteuern des Steuerventils ist insgesamt nur eine geringe Ölmenge erforderlich.Only a small amount of oil is required to reverse the control valve.

Ein weiterer Vorteil der Schlagvorrichtung ist die einfache Austauschbarkeit des Kolbens. Da der Durchmesser des Führungszylinders des Schlagkolbens kleiner ist als der Innendurchmesser des hülsenfömigen Steuerventils, kann z.B. zu Instandsetzungszwecken der Schlagkolben ohne Demontage des Steuerventils gewechselt werden.Another advantage of the striking device is the easy interchangeability of the piston. Since the diameter of the guide cylinder of the percussion piston is smaller than the inner diameter of the sleeve-shaped control valve, e.g. the percussion pistons can be replaced for maintenance purposes without dismantling the control valve.

Die Erfindung wird anhand von Zeichnungen einer schematisch dargestellten Schlagvorrichtung näher erläutert.The invention is explained in more detail with the aid of drawings of a schematically illustrated impact device.

Es zeigen

  • Fig. 1 eine erfindungsgemaße Schlagvorrichtung im Axialschnitt mit am Beginn des Rückhubes befindlichem Schlagkolben,
  • Fig. 2 die Schlagvorrichtung gemäß Fig. 1 mit am Beginn des Schlaghubes befindlichem Schlagkolben.
  • Fig. 3 aen Scr lagkolben,
  • Fig. 4 das Steuerventil,
  • Fig. 5 im Detail den Ringraum zwischen Schlagkolben, Steuerventil und Gehäuse.
Show it
  • 1 shows an impact device according to the invention in axial section with an impact piston located at the beginning of the return stroke,
  • Fig. 2 shows the striking device of FIG. 1 with the striking piston located at the beginning of the striking stroke.
  • 3 aen Scr lagkol b en,
  • 4 the control valve,
  • Fig. 5 in detail the annular space between the percussion piston, control valve and housing.

wie Fig. 1 (ergänzend dazu Fig. 3 und 4) zeigt, besteht die Schlagvorrichtung aus dem Gehäuse 2, dem Schlagkolben 3 und dem Steuerventil 4, wobei axial in das Gehäuse ein Schlagwerkzeug 1, wie Meißel, Bohrer o.ä., eingebracht wird, auf das der sich axial hin und her bewegende Schlagkolben wirkt.As shown in FIG. 1 (in addition to FIGS. 3 and 4), the striking device consists of the housing 2, the striking piston 3 and the control valve 4, an impact tool 1, such as a chisel, drill or the like, being introduced axially into the housing on which the axially reciprocating percussion piston acts.

In der Fig. 1 hat der Schlagkolben den Schlag ausgeführt. Die Steuerkante 3.3 des Führungszylinder; 3" hat die Mündung des Ablasses 7.1 des Verbindungskanals 7 freigegeben. Über die Zuführung 7.2 ist das Drucköl in den Ringraum 8.2 gelangt und hat über die Ringfläche der Steuerkante 4.3 das Steuerventil 4 in Richtung des Schlagwerkzeuges 1 bewegt und die Ringfläche der Steuerkante 4.6 des Steuerventils 4 gegen die Ringfläche 2.4 des Gehäuses gelegt. Das 01 aus der Ringnunt 5-" ist über den mittleren Ablaß 6.3 und die obere Verbindung 6.4 zum Ölauslaß 6 gelangt.In Fig. 1, the percussion piston has carried out the blow. The control edge 3.3 of the guide cylinder; 3 "has opened the mouth of the drain 7.1 of the connecting channel 7. The pressure oil has reached the annular space 8.2 via the feed 7.2 and has moved the control valve 4 in the direction of the striking tool 1 via the annular surface of the control edge 4.3 and the annular surface of the control edge 4.6 of the control valve 4 against the ring surface 2.4 of the housing. The 01 from the ring groove 5- "has reached the oil outlet 6 via the middle outlet 6.3 and the upper connection 6.4.

Uber die obere Verbindung 5.4 und die obere Zuführung 5.5 ist der Ringraum 5''" geöffnet, so daß Drucköl vom Druckeinlaß 5 über die Ringfläche der Steuerkante 4.4 das Steuerventil in die Position "Rückhub" verschiebt. Das Steuerventil 4 hat dabei die obere Ringnut 6" und die untere Ringnut 6' freigegeben. Das Öl aus dein inneren Ringraum 8.1 kann uber den oberen Ablaß 6.5 zum Ölauslaß 6 abfließen. Gleichzeitig versperrt in dieser Position das Steuerventil 4 die Ringnut 5" und damit die Zufuhr des Drucköles über die Zuführung 5.3 zur Ringfläche der Steuerkante 3.3. Der Druck des im Ringraum 8.3 anstehenden Öles hält das Steuerventil 4 über die Ringfläche der Steuerkante 4.4 in seiner Position.Via the upper connection 5.4 and the upper feed 5.5, the annular space 5 ''"is opened, so that pressure oil from the pressure inlet 5 via the annular surface of the control edge 4.4 ver the control valve in the" return stroke "position pushes. The control valve 4 has released the upper annular groove 6 "and the lower annular groove 6 '. The oil from your inner annular space 8.1 can flow out to the oil outlet 6 via the upper drain 6.5. At the same time, the control valve 4 blocks the annular groove 5" and thus in this position the supply of the pressure oil via the supply 5.3 to the annular surface of the control edge 3.3. The pressure of the oil present in the annular space 8.3 holds the control valve 4 in position over the annular surface of the control edge 4.4.

Das über die unter Verbindung 5.2 und die Zuführung 5.1 in den unteren Ringraum 5' gelangende Drucköl wirkt auf die Ringfläche 3.1 des Zylinders 3' und bewegt den Schlagkolben in Richtung der dem Schlagwerkzeug abgewandten Seite des Kolbens. Kurz vor Ende des Rückhubes trifft der Schlagkolben 3 auf das Steuerventil 4 (Fig. 5). Ein Teil der Außenwand des Zapfens 3.4 wird in die Innenbohrung 4.2 des Steuerventils 4 geschoben. Das sich zwischen den Flächen der Außenwand des Zapfens 3.4 der Ringfläche 3.3 der Gehäuseinnenwand 2.1 und der Ringfläche der unteren Kante 4.1 des Steuerventils 4 befindende Öl wird in dem entstandenen Ringraum eingeschlossen. Die sich überdeckenden Flächen zwischen dem Zapfen 3.4 und der Innenbohrung 4.2 sowie dem mittleren Zylinder 3" und der Gehäuseinnenbohrung 2.1 dichten ausreichend ab.The pressure oil reaching the lower annular space 5 'via connection 5.2 and the feed 5.1 acts on the annular surface 3.1 of the cylinder 3' and moves the percussion piston in the direction of the side of the piston facing away from the percussion tool. Shortly before the end of the return stroke, the percussion piston 3 hits the control valve 4 (FIG. 5). A part of the outer wall of the pin 3.4 is pushed into the inner bore 4.2 of the control valve 4. The oil located between the surfaces of the outer wall of the pin 3.4 of the ring surface 3.3 of the housing inner wall 2.1 and the ring surface of the lower edge 4.1 of the control valve 4 is enclosed in the resulting annular space. The overlapping surfaces between the pin 3.4 and the inner bore 4.2 and the middle cylinder 3 "and the housing inner bore 2.1 provide sufficient sealing.

Die Dichtfläche, die gebildet wird von der Außenfläche 4.7 und der Gehäuseinnenfläche 2.1 wird bei der Rückbewegung des Steuerventils 4 kleiner. Nach Überschreiten der Steuerkante 2.2 des Gehäuses 2 durch die Kante 4.1 des Steuerventils 4 steht in dem oben beschriebenen Ringraum der Druck des Öls aus der Ringnut 5" an.The sealing surface which is formed by the outer surface 4.7 and the housing inner surface 2.1 becomes smaller when the control valve 4 moves back. After the control edge 2.2 of the housing 2 has been exceeded by the edge 4.1 of the control valve 4, the pressure of the oil from the annular groove 5 ″ is present in the annular space described above.

Das druckseitige Öl wirkt auf die Ringfläche 3.3 des Schlagkolbens 3 und bremst seine Bewegung ab. Das Steuerventil bewegt sich in die Position "Schlaghub" (Fig. 2). Das druckseitige Öl gelangt nach Überschreiten der Steuerkante 3.5 des Schlagkolbens 3 durch die Steuerkante 4.1 des Steuerventils 4 in den inneren Ringraum 8.1. Der Schlagkolben wird beschleunigt in Richtung Schlagwerkzeug bewegt, da zu der Ringfläche 3.3 nun auch die Ringflache 3.5 in Schlagrichtung wirksam wird. Das Öl der mittleren Ringnut 5"' fließt über den Verbindungskdnal 7 und den Ringraum 3.2 zum Öl- duslde 6.The oil on the pressure side acts on the annular surface 3.3 of the percussion piston 3 and brakes its movement. The control valve moves to the "stroke stroke" position (Fig. 2). After the control edge 3.5 of the percussion piston 3 has been exceeded, the pressure-side oil passes through the control edge 4.1 of the control valve 4 into the inner annular space 8.1. The percussion piston is accelerated moves in the direction of impact tool as to the annular surface 3.3 now the R i n gflache 3.5 in the impact direction is effective. The oil of the middle annular groove 5 "'flows via the Verbindungsk d nal 7 and the annulus to 3.2 duslde oil. 6

Die Fig. 2 zeigt das Steuerventil 4 in der Position "Schlaghub". Das Steuerventil 4 liegt mit der Stirnflache 4.5 auf der Ringfläche 2.3 des Gehauses 2. Der Abfluß des Öls aus dem Ringraum 8.1 in den oberen Ablaß 6.5 und die Ringnut 6'' und 6' ist unterbunden. Das Drucköl gelangt über die Zuführung 5.3 und die Ringnut 5" in den Raum 8.1 und damit auf die dem Schlagwerkzeug abgewandte Stirnfläche 3.5 und 3.3 sowie über die Zufuhrung 5.1 auf die dem Schlagwerkzeug zugewandte Stirnfläche 3.1 des Ringraumes 5'.2 shows the control valve 4 in the "stroke stroke" position. The control valve 4 lies with the end face 4.5 on the annular surface 2.3 of the housing 2. The outflow of the oil from the annular space 8.1 into the upper drain 6.5 and the annular groove 6 ″ and 6 ′ is prevented. The pressure oil passes through the supply 5.3 and the annular groove 5 "into the space 8.1 and thus onto the end face 3.5 and 3.3 facing away from the striking tool and via the feed 5.1 onto the end face 3.1 of the annular space 5 'facing the striking tool.

Da cie Ringflächen 3.3 und 3.5 deutlich größer sind als die Ringfläche 3.1 bewegt sich der als Differentialkolben ausgebildete Schlagkolben in Richtung des Schlagwerkzeuges.Since the ring surfaces 3.3 and 3.5 are significantly larger than the ring surface 3.1, the percussion piston designed as a differential piston moves in the direction of the striking tool.

Claims (5)

1. Hydraulisch betätigte Schlagvorrichtung, bestehend aus einem Gehäuse mit Zylinderräumen und Kanälen für eine Druckflüssigkeit sowie einem in den Zylinderräumen axial hin und her bewegbaren, als Differentialkolben ausgebildeten Schlagkolben zur Übennittlung von Schlagenergie auf ein Schlagwerkzeug, und einem konzentrisch zum Schlagkolben angeordneten, axial beweglichen hülsenförmigen querbohrungslosen Steuerungsventil, wobei das Steuerungsventil vom Schlagkolben in einer Richtung mechanisch, in der anderen Richtung hydraulisch verschiebbar ist, dadurch gekennzeichnet,
daß das Steuerventil (4) konzentrisch um eine an der dem Schlagwerkzeug (1) abgewandten Seite des Schlagkolbens vorgesehene Kolbenstange (3.6) angeordnet ist, daß ein Verbindungskanal (7) vorgesehen ist, dessen eine Mündung (7.2) mit einem Ringraum (5"'), der in jeder Stellung des Steuerventils (4) den auf diesem Steuerventil angeformten Außenkragen (4') aufnimmt, in Verbindung steht und dessen andere Mündung (7.1) am Ende des Schlaghubes geöffnet Ist und mit einem inneren Ringraum (8.1), der sich zwischen der Kolbenstange (3.6) und der Gehäuseinnenwand (2.1) erstreckt. in Verbindung steht, daß am Schlagkolben (3) ein Bund (3.4) zum Steuerventil (4) weisend angeordnet ist, mit einem Außendurch - messer, der kleiner ist als der Innendurchmesser der Innenbohrung (4.2) des Steuerventils (4) und die Länge des Bundes (3.4) derart ausgelegt ist, daß kurz vor der Endphase des Rückhubes des Schlagkolbens (3) ein Teil der zylinderischen Wand des Bundes (3.4) in die Innenbohrung (4.2) eindringt, wobei der andere Teil mit der Gehäuseinnenwand (2.1) und den sich gegenseitig zugewandten Seiten der Kante (4.1) des Steuerventils (4) und der Kante (.3.3) des Zylinders (3") des Schlagkolbens (3) einen Ringraum begrenzt.1.Hydraulically actuated striking device, consisting of a housing with cylinder chambers and channels for a pressure fluid, and a percussion piston, axially movable back and forth in the cylinder chambers, designed as a differential piston for transferring impact energy to a percussion tool, and an axially movable, sleeve-shaped one arranged concentrically to the percussion piston Control valve without cross-bore, the control valve being mechanically displaceable by the percussion piston in one direction and hydraulically in the other direction, characterized in that
that the control valve (4) is arranged concentrically around a piston rod (3.6) provided on the side of the percussion piston facing away from the striking tool (1), that a connecting channel (7) is provided, one mouth (7.2) of which has an annular space (5 "' ), which in each position of the control valve (4) receives the outer collar (4 ') formed on this control valve, is in communication and the other mouth (7.1) of which is open at the end of the stroke and has an inner annular space (8.1) which is between the piston rod (3.6) and the inner wall of the housing (2.1) is connected to the fact that a collar (3.4) is arranged on the percussion piston (3) facing the control valve (4), with an outer diameter that is smaller than the inner diameter the inner bore (4.2) of the control valve (4) and the length of the collar (3.4) is designed such that shortly before the end phase of the return stroke of the percussion piston (3) a part of the cylindrical wall of the collar (3.4) into the inner bore (4.2) penetrates, the other part with the housing inner wall (2.1) and the mutually facing sides of the edge (4.1) of the control valve (4) and the edge (.3.3) of the cylinder (3 ") of the percussion piston (3) delimits an annular space. 2. Schlagvorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß der Außendurchmesser des Kopfes des Steuerventils (4) an .der dem Scnlagwerkzeug abgewandten Seite kleiner ist als der Außendurchnesser eines mit dem Ölauslaß (6) in Verbindung stehenden Ringraumes (6") des Gehäuses (2).2. Impact device according to claim 1,
characterized,
that the outside diameter of the head of the control valve (4) on the side facing away from the indexing tool is smaller than the outside diameter of an annular space (6 ") of the housing (2) connected to the oil outlet (6). 3..Schlagvorrichtung nach den Ansprüchen 1 und 2,
dadurch gekennzeichnet,
daß der Abstand der einander zugewandten Flächen einer Ringfläche (2.3), die über eine Ringnut (6') mit einem Ölauslaß (6.5) in Verbindung steht, und der dem Schlagwerkzeug (1) zugewandten Seite einer Ringfläche (2.2), die über eine Ringnut (5") mit der Ölzuführung (5.3) in Verbindung steht, größer ist als die Länge des hülsenförmigen Steuerventils (4).3. impact device according to claims 1 and 2,
characterized,
that the distance between the facing surfaces of an annular surface (2.3), which is connected to an oil outlet (6.5) via an annular groove (6 '), and the side of an annular surface (2.2) facing the striking tool (1), which is connected via an annular groove (5 ") with the oil supply (5.3) is greater than the length of the sleeve-shaped control valve (4). 4. Schlagvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet,
daß die Ringfläche der Kante (3.3) größer ist als eine Ringfläche (3.1), die auf der dem Schlagwerkzeug zugewandten Seite des am Schlagkolben vorgesehenen Zylinders (3') angeordnet ist.4. Impact device according to one of claims 1 to 3, characterized in
that the annular area of the edge (3.3) is larger than an annular area (3.1) which is arranged on the side of the cylinder (3 ') provided on the percussion piston facing the percussion tool. 5. Schlagvorrichtung nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß eine Ringnut (5'), deren Mündung am Ende des Schlaghubes durch den Außenkragen des Zylinders (3') des Schlagkolbens (3) bis auf einen Teil geschlossen ist, die Ringnut (5") sowie eine Ringnut (5""), die bei der Stellung des Steuerventils (4) "Schlagen" durch den Hülsenabschnitt verschlossen wird, der an der Steuerventilaußenseite durch eine Außenwand (4) und einer dem Schlagwerkzeug (1) abgewandten Steuerkante (4.4) begrenzt wird, über an die Druckleitung (5) angeschlossenen Kanäle (5.2, 5.3, 5.5) miteinander verbunden sind.5. Impact device according to one of claims 1 to 4,
characterized,
that an annular groove (5 '), the mouth of which is closed at the end of the stroke by the outer collar of the cylinder (3') of the impact piston (3) except for part, the annular groove (5 ") and an annular groove (5""), which is closed in the position of the control valve (4) by the sleeve section which is delimited on the outside of the control valve by an outer wall (4) and a control edge (4.4) facing away from the striking tool (1), via to the pressure line (5) connected channels (5.2, 5.3, 5.5) are interconnected.
EP84730125A 1984-01-03 1984-11-26 Hydraulically actuated percussion tool Expired EP0149967B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84730125T ATE37315T1 (en) 1984-01-03 1984-11-26 HYDRAULICALLY ACTUATED IMPACT DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3400302 1984-01-03
DE19843400302 DE3400302A1 (en) 1984-01-03 1984-01-03 HYDRAULIC ACTUATOR

Publications (2)

Publication Number Publication Date
EP0149967A1 true EP0149967A1 (en) 1985-07-31
EP0149967B1 EP0149967B1 (en) 1988-09-21

Family

ID=6224426

Family Applications (1)

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EP84730125A Expired EP0149967B1 (en) 1984-01-03 1984-11-26 Hydraulically actuated percussion tool

Country Status (7)

Country Link
US (1) US4635531A (en)
EP (1) EP0149967B1 (en)
JP (1) JPS60150975A (en)
AT (1) ATE37315T1 (en)
DE (2) DE3400302A1 (en)
FI (1) FI844848L (en)
ZA (1) ZA8523B (en)

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EP0388498A1 (en) * 1989-03-23 1990-09-26 Menck Gmbh Hydraulic valve system for a pile driver hammer
WO1993014271A1 (en) * 1992-01-21 1993-07-22 Bsp International Foundations Limited Valve mechanism
EP0847836A1 (en) 1996-12-14 1998-06-17 Krupp Bautechnik GmbH Percussive tool with fluid pressure drive
WO1999038655A1 (en) * 1998-01-31 1999-08-05 Caldervale Engineering Services Limited Fluid actuated tool
AT407919B (en) * 1998-01-19 2001-07-25 Boehler Pneumatik Internat Gmb PNEUMATICALLY OR HYDRAULICALLY OPERATING HAMMER AND USE OF THE HAMMER TO OPEN OR SEAL A TAP OPENING OF A METALLURGICAL VESSEL
CN100436073C (en) * 2000-07-13 2008-11-26 蒙塔博特股份有限公司 Percussion hydraulic apparatus
ITBA20120055A1 (en) * 2012-09-24 2014-03-25 Tecna Group Srl SHOCK EXTRACTOR WITH PISTON AND OPTIMIZED HYDRAULIC CIRCUIT
CN105710845A (en) * 2014-12-17 2016-06-29 卡特彼勒公司 Hydraulic Hammer Having Variable Stroke Control

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FR2676953B1 (en) * 1991-05-30 1993-08-20 Montabert Ets HYDRAULIC PERCUSSION APPARATUS.
DE19804078A1 (en) * 1998-02-03 1999-08-05 Krupp Berco Bautechnik Gmbh Fluid powered striking mechanism
FI107891B (en) * 1998-03-30 2001-10-31 Sandvik Tamrock Oy Impact fluid driven impactor
SE522213C2 (en) 2000-05-31 2004-01-20 Morphic Technologies Ab Hydraulic stroke / compression device
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SE528033C2 (en) * 2004-03-12 2006-08-15 Atlas Copco Constr Tools Ab Hydraulic hammer
FI119398B (en) * 2006-12-21 2008-10-31 Sandvik Mining & Constr Oy The impactor,
AT511810B1 (en) 2011-09-27 2013-03-15 Tmt Bbg Res And Dev Gmbh HITCH FOR A HAMMAR EQUIPMENT AND METHOD FOR DISPLAYING A HITCH OPENING
SE537608C2 (en) 2013-11-01 2015-07-28 Tools Pc Ab Const Pneumatic impact device and method of pneumatic impact device
CN103726783A (en) * 2013-11-28 2014-04-16 江麓机电集团有限公司 Novel sleeve valve type hydraulic impacting mechanism
US20160221171A1 (en) * 2015-02-02 2016-08-04 Caterpillar Inc. Hydraulic hammer having dual valve acceleration control system
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Cited By (9)

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EP0388498A1 (en) * 1989-03-23 1990-09-26 Menck Gmbh Hydraulic valve system for a pile driver hammer
WO1993014271A1 (en) * 1992-01-21 1993-07-22 Bsp International Foundations Limited Valve mechanism
EP0847836A1 (en) 1996-12-14 1998-06-17 Krupp Bautechnik GmbH Percussive tool with fluid pressure drive
US5960893A (en) * 1996-12-14 1999-10-05 Krupp Bautechnik Gmbh Fluid-powered percussion tool
AT407919B (en) * 1998-01-19 2001-07-25 Boehler Pneumatik Internat Gmb PNEUMATICALLY OR HYDRAULICALLY OPERATING HAMMER AND USE OF THE HAMMER TO OPEN OR SEAL A TAP OPENING OF A METALLURGICAL VESSEL
WO1999038655A1 (en) * 1998-01-31 1999-08-05 Caldervale Engineering Services Limited Fluid actuated tool
CN100436073C (en) * 2000-07-13 2008-11-26 蒙塔博特股份有限公司 Percussion hydraulic apparatus
ITBA20120055A1 (en) * 2012-09-24 2014-03-25 Tecna Group Srl SHOCK EXTRACTOR WITH PISTON AND OPTIMIZED HYDRAULIC CIRCUIT
CN105710845A (en) * 2014-12-17 2016-06-29 卡特彼勒公司 Hydraulic Hammer Having Variable Stroke Control

Also Published As

Publication number Publication date
DE3400302C2 (en) 1988-01-07
JPS60150975A (en) 1985-08-08
ATE37315T1 (en) 1988-10-15
DE3400302A1 (en) 1985-08-29
FI844848A0 (en) 1984-12-07
FI844848L (en) 1985-07-04
US4635531A (en) 1987-01-13
ZA8523B (en) 1985-11-27
EP0149967B1 (en) 1988-09-21
DE3474120D1 (en) 1988-10-27

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