EP0906811B1 - Drill hammer - Google Patents

Drill hammer Download PDF

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Publication number
EP0906811B1
EP0906811B1 EP97810731A EP97810731A EP0906811B1 EP 0906811 B1 EP0906811 B1 EP 0906811B1 EP 97810731 A EP97810731 A EP 97810731A EP 97810731 A EP97810731 A EP 97810731A EP 0906811 B1 EP0906811 B1 EP 0906811B1
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EP
European Patent Office
Prior art keywords
valve
motor
hammer drill
impact tool
throttle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97810731A
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German (de)
French (fr)
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EP0906811A1 (en
Inventor
Max Siegenthaler
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.)
Syntegon Packaging Systems AG
Original Assignee
SIG Produktionstechnik AG
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 SIG Produktionstechnik AG filed Critical SIG Produktionstechnik AG
Priority to AT97810731T priority Critical patent/ATE217564T1/en
Priority to DE59707289T priority patent/DE59707289D1/en
Priority to EP97810731A priority patent/EP0906811B1/en
Priority to CA002248697A priority patent/CA2248697A1/en
Priority to JP10279567A priority patent/JPH11159272A/en
Priority to US09/165,862 priority patent/US6119793A/en
Publication of EP0906811A1 publication Critical patent/EP0906811A1/en
Application granted granted Critical
Publication of EP0906811B1 publication Critical patent/EP0906811B1/en
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Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B6/00—Drives for drilling with combined rotary and percussive action
    • E21B6/06—Drives for drilling with combined rotary and percussive action the rotation being intermittent, e.g. obtained by ratchet device
    • E21B6/08—Separate drives for percussion and rotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
    • E21B44/02—Automatic control of the tool feed
    • E21B44/06—Automatic control of the tool feed in response to the flow or pressure of the motive fluid of the drive

Definitions

  • a hammer drill according to the preamble of claim 1 is known from the US-A-5 415 240 is known.
  • the turning mechanism of this hammer is made by driven a rotary motor.
  • the striking mechanism is operated by a rotary valve controlled via a gear connection from the rotary motor is driven.
  • This has the advantage that the beat frequency is proportional to the speed of the rotary motor and that that Hammer mechanism stops automatically if the drill steel gets stuck. This can save a lot of time and drilling equipment.
  • This hammer drill has therefore proven itself very well. However, he did a somewhat complex construction.
  • EP-A-145701 describes a further hammer drill according to the preamble of claim 1 described.
  • a pilot operated valve is arranged in the feed line to the striking mechanism.
  • the food pressure to the rotary motor is the pilot pressure of the pilot valve. If the drill steel gets stuck in the borehole, the Speed of the rotary motor towards zero. This increases the Feed pressure to the rotary motor so that the pilot valve feeds to the striking mechanism stops.
  • This solution requires a predetermined one Feed pressure to the rotary motor. Therefore this pressure cannot can be adapted to different rock formations. This The hammer drill is therefore relatively inflexible in use.
  • the present invention has for its object a To further develop hammer drills of the type mentioned at the outset, that it is simpler than the US-A-5 hammer drill 415 240 while maintaining its advantages and being flexible is in use. This task is characterized by the Features of claim 1 solved.
  • Figure 1 shows a hydraulic diagram for a hammer drill 9.
  • Der Hammer drill 9 has a housing, not shown, in which a Adapter is reciprocally and rotatably mounted. On his the adapter has a front end e.g. an external thread for connection of the drilling steel. The adapter is via a gear connection connected to a rotary motor 10. As far as corresponds the hammer of the representation according to FIG. 1 of US Pat. No. 5,415,240.
  • a striking mechanism 11 with a cylinder is coaxial with the adapter 12 guided pistons 13 and a piston rod 14 are arranged.
  • the end face of the rod 14 strikes against the rear end of the adapter.
  • the piston surface 15 on the rod side the supply pressure is constantly applied.
  • the opposite Surface 16 is alternated via a hammer mechanism valve 17 with feed pressure from the feed line 18 and with the return pressure connected in the return line 19.
  • Via pilot lines 20, 21, each in the cylinder space adjacent to an end position of the piston 13 open the valve spool of the valve 17 driven alternately in the two switch positions.
  • On the feed line 18 and the return line 19 are each a pressure accumulator 22, 23 connected.
  • the hammer 9 is connected to one via four pressure lines 30 to 33 Control station 34 connected.
  • the control station 34 has separate connections 35, 36 for the adjustable feed pressure to the rotary motor 10 and to the striking mechanism 11.
  • the return of the slewing gear and striking mechanism can be either a common or two separate connectors 37, 38 have.
  • the rotary motor 10 is operated via a three-position four-way valve 39 controlled so that the motor 10 rotate in both directions of rotation can.
  • One direction of rotation is used for drilling, the other for Unscrew the drill pipe.
  • the line 30 with Pressure is applied.
  • adjustable Throttle 40 installed and a parallel to it Check valve 41, which opens in the return direction. With The flow rate for the two can be set in the restrictors 40 Set directions of rotation separately.
  • Another adjustable throttle 42 is used in connection 37.
  • the feed pressure to the striking mechanism 11 is operated manually Two-position valve 46 controlled.
  • a pilot-controlled two-way valve 47 In series with this valve 46 is a pilot-controlled two-way valve 47 and in parallel for this purpose, a manually controlled two-way valve 48 is switched.
  • the Valve 47 can either be a switching valve (open-close valve) or, as shown, be a experimental valve.
  • the pilot print for Valve 47 is the return pressure of the slewing gear between the valve 39 and the throttle 42.
  • the hammer drill 9 described works as follows: Im Normal operation is the slide of the valve 39 in the lower one Position so that the feed pressure at the throttle 40 in the line 30 is pending and the line 31 connected to the return 37 is.
  • the valve 46 is switched on. While running Engine 10 results in a dynamic pressure upstream of throttle 42, so that the valve 47 is also switched on and the striking mechanism 11 running. If the drill pipe should get stuck in the rock, The engine 10 stops. The pilot pressure also drops immediately Valve 47 off, so that it switches off and the striking mechanism 11 stops.
  • the hammer drill is opened withdrawn his gun carriage.
  • the valve 39 is switched off.
  • the hammer mechanism can be activated by switching on the valve 48 be turned on despite the engine 10 stopped, so that Hammer vibrates. If that often screwed together from several rods If the drill pipe is to be dismantled, the The rearmost boring bar is extended from the borehole and the drill pipe on the sleeve to the second rear boring bar with one Clamping device clamped. Now the valve 39 is in its upper Position switched so that a torque on the adapter in the releasing Senses. If the threaded connection is stuck, it can the hammer mechanism 11 again by switching on the valves 46, 48 switched on and the threaded connection vibrated.
  • the hammer described is very versatile in use, because the striking mechanism and the boring machine operated independently of each other can still be the hammer mechanism when drilling stops immediately if the slewing gear does not turn. With that the time-consuming and sometimes impossible disassembly of a hammered, jammed drill pipe avoided.
  • the throttle 42 can do so be set so that the valve 47 switches off before the engine 10 has come to a complete standstill. This is from Advantage, because it makes the drill pipe stick even more securely is avoided. If the valve 47 as a proportional valve trained, can also be achieved that the Beat frequency increases with increasing speed of the motor 10.
  • the Ratio between speed and stroke frequency can with the Throttle 42 can be set, which for several types of rock Advantage is.
  • the hammer drill according to the invention is essential more simply constructed than the one mentioned at the beginning. That is why his External dimensions smaller, which is due to the limited space in tunneling or on superstructures of milling machines an advantage is.
  • the hammer mechanism valve 17 can, for example, laterally be installed so that the hammer drill 9 closer to the carriage can be assembled. This will make the drilling feed occurring moments smaller. Because the hydraulic coupling between slewing gear and striking mechanism from the return pressure of the rotating motor is derived, it is independent of the feed pressure at Rotary engine. This makes the hammer drill very flexible in use, especially for drilling in different rock types because the feed pressure is optimally adapted to the rock to be drilled can be.
  • the circuit described is suitable for hydraulic also for pneumatic drives.
  • valves especially those outside the Hammer 9
  • the actuation of the valves, especially those outside the Hammer 9 can alternatively to the type shown hydraulically, pneumatically, electrically or by hand.
  • Um with the right rotation, that means when loosening the thread of the drill pipe, that is, if at port A7 of valve 39 the Feed pressure is pending, to be able to operate the striking mechanism is the Connection 56 of the motor 55 additionally via an orifice 58 manual switching valve 59 and a check valve 60 with the Line 30 connected. So if a torque on the rotary motor 10 is in the loosening sense without turning, that is with tight thread, the thread can be switched on manually of the striking mechanism 11 can be shaken off. If with that Rotary hammer 9 is to be drilled in the clockwise sense, what For example, in Australia, the two connections swapped to the rotary motor 10.
  • the embodiment of Figure 3 is constructed similarly to that according to FIG. 2.
  • the elements 52 to 56 and 58 to 60 installed in the hammer drill 9.
  • the valve 59 is not manually controlled, but via a pilot line 63 from one hand-operated valve 64 pilot operated.
  • the stroke engine 55 drives the hammer mechanism valve 17 directly, so it is in this case a hammer mechanism valve motor.
  • the mode of action is analogous to that the embodiment of Figure 2.

Abstract

The hammer drill has an impact tool with impact frequency linked to the motor RPM. The linkage is via pressure medium-actuated means without a mechanical coupling between the torque motor (10) and impact tool (11). A return line from a first valve (39) contains a throttle (42), and the pressure upstream of the throttle is switched as regulating pressure to a pilot-controlled third valve (47). The third valve is located in one of two lines (32, 33) to the impact tool valve (17), to block the lines, when the pressure upstream of the throttle falls to below set minimum level.

Description

Ein Bohrhammer gemäss Oberbegriff des Anspruchs 1 ist aus der US-A-5 415 240 bekannt. Das Drehwerk dieses Hammers wird durch einen Drehmotor angetrieben. Das Schlagwerk wird von einem Drehventil gesteuert, das über eine Getriebeverbindung vom Drehmotor angetrieben ist. Dies hat den Vorteil, dass die Schlagfrequenz proportional zur Drehzahl des Drehmotors ist und dass das Schlagwerk automatisch stoppt, wenn der Bohrstahl steckenbleibt. Dadurch kann erheblich Zeit und Bohrausrüstung eingespart werden. Dieser Bohrhammer hat sich deshalb sehr bewährt. Er hat allerdings eine etwas aufwendige Bauweise.A hammer drill according to the preamble of claim 1 is known from the US-A-5 415 240 is known. The turning mechanism of this hammer is made by driven a rotary motor. The striking mechanism is operated by a rotary valve controlled via a gear connection from the rotary motor is driven. This has the advantage that the beat frequency is proportional to the speed of the rotary motor and that that Hammer mechanism stops automatically if the drill steel gets stuck. This can save a lot of time and drilling equipment. This hammer drill has therefore proven itself very well. However, he did a somewhat complex construction.

In der EP-A-145701 ist ein weiterer Bohrhammer gemäss Oberbegriff des Anspruchs 1 beschrieben. Ein pilotgesteuertes Ventil ist in der Zufuhrleitung zum Schlagwerk angeordnet. Der Speisedruck zum Drehmotor ist der Pilotdruck des Pilotventils. Wenn der Bohrstahl im Bohrloch steckenbleibt, reduziert sich die Drehzahl des Drehmotors gegen Null. Dadurch erhöht sich der Speisedruck zum Drehmotor, so dass das Pilotventil die Zufuhr zum Schlagwerk stoppt. Diese Lösung erfordert einen vorbestimmten Speisedruck zum Drehmotor. Deshalb kann dieser Druck nicht an verschiedene Gesteinsformationen angepasst werden. Dieser Bohrhammer ist deshalb relativ unflexibel in der Anwendung.EP-A-145701 describes a further hammer drill according to the preamble of claim 1 described. A pilot operated valve is arranged in the feed line to the striking mechanism. The food pressure to the rotary motor is the pilot pressure of the pilot valve. If the drill steel gets stuck in the borehole, the Speed of the rotary motor towards zero. This increases the Feed pressure to the rotary motor so that the pilot valve feeds to the striking mechanism stops. This solution requires a predetermined one Feed pressure to the rotary motor. Therefore this pressure cannot can be adapted to different rock formations. This The hammer drill is therefore relatively inflexible in use.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Bohrhammer der eingangs genannten Art derart weiterzubilden, dass er einfacher aufgebaut ist als der Bohrhammer nach US-A-5 415 240 unter Beibehaltung von dessen Vorteilen und dass er flexibel in der Anwendung ist. Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.The present invention has for its object a To further develop hammer drills of the type mentioned at the outset, that it is simpler than the US-A-5 hammer drill 415 240 while maintaining its advantages and being flexible is in use. This task is characterized by the Features of claim 1 solved.

Nachfolgend werden Ausführungsbeispiele der Erfindung anhand der Zeichnungen erläutert. Darin zeigt:

  • Figur 1 ein Hydraulikschema einer ersten Ausführungsform, und
  • Figuren 2 und 3 zwei weitere Ausführungsformen.
    • Exemplary embodiments of the invention are explained below with reference to the drawings. It shows:
  • Figure 1 is a hydraulic diagram of a first embodiment, and
  • Figures 2 and 3 two further embodiments.

    • Figur 1 zeigt ein Hydraulikschema für einen Bohrhammer 9. Der Bohrhammer 9 hat ein nicht dargestelltes Gehäuse, in welchem ein Adapter hin- und herbeweglich und rotierbar gelagert ist. An seinem vorderen Ende hat der Adapter z.B. ein Aussengewinde zum Anschliessen des Bohrstahls. Der Adapter ist über eine Getriebeverbindung mit einem Drehmotor 10 verbunden. Soweit entspricht der Hammer der Darstellung nach Figur 1 der US-PS-5 415 240.Figure 1 shows a hydraulic diagram for a hammer drill 9. Der Hammer drill 9 has a housing, not shown, in which a Adapter is reciprocally and rotatably mounted. On his the adapter has a front end e.g. an external thread for connection of the drilling steel. The adapter is via a gear connection connected to a rotary motor 10. As far as corresponds the hammer of the representation according to FIG. 1 of US Pat. No. 5,415,240.

    Koaxial zum Adapter ist ein Schlagwerk 11 mit einem in einem Zylinder 12 geführten Kolben 13 und einer Kolbenstange 14 angeordnet. Im Betrieb schlägt die Stirnfläche der Stange 14 gegen das hintere Ende des Adapters. Die stangenseitige Kolbenfläche 15 ist konstant mit dem Speisedruck beaufschlagt. Die gegenüberliegende Fläche 16 wird über ein Schlagwerkventil 17 abwechselnd mit Speisedruck aus der Speiseleitung 18 und mit dem Rücklaufdruck in der Rücklaufleitung 19 verbunden. Über Pilotleitungen 20, 21, die in den Zylinderraum benachbart jeweils einer Endstellung des Kolbens 13 münden, wird der Ventilschieber des Ventils 17 abwechselnd in die beiden Schaltstellungen getrieben. An die Speiseleitung 18 und die Rückleitung 19 ist je ein Druckspeicher 22, 23 angeschlossen. Diese ermöglichen eine hohe Kapazität des Schlagwerks 11.A striking mechanism 11 with a cylinder is coaxial with the adapter 12 guided pistons 13 and a piston rod 14 are arranged. In operation, the end face of the rod 14 strikes against the rear end of the adapter. The piston surface 15 on the rod side the supply pressure is constantly applied. The opposite Surface 16 is alternated via a hammer mechanism valve 17 with feed pressure from the feed line 18 and with the return pressure connected in the return line 19. Via pilot lines 20, 21, each in the cylinder space adjacent to an end position of the piston 13 open, the valve spool of the valve 17 driven alternately in the two switch positions. On the feed line 18 and the return line 19 are each a pressure accumulator 22, 23 connected. These enable a high capacity the striking mechanism 11.

    Der Hammer 9 ist über vier Druckleitungen 30 bis 33 mit einem Steuerstand 34 verbunden. Der Steuerstand 34 hat separate Anschlüsse 35, 36 für den einstellbaren Speisedruck zum Drehmotor 10 und zum Schlagwerk 11. Der Rücklauf von Drehwerk und Schlagwerk kann entweder einen gemeinsamen oder zwei separate Anschlüsse 37, 38 haben.The hammer 9 is connected to one via four pressure lines 30 to 33 Control station 34 connected. The control station 34 has separate connections 35, 36 for the adjustable feed pressure to the rotary motor 10 and to the striking mechanism 11. The return of the slewing gear and striking mechanism can be either a common or two separate connectors 37, 38 have.

    Der Drehmotor 10 wird über ein Dreistellungs-Vierwegeventil 39 gesteuert, so dass der Motor 10 in beiden Drehrichtungen drehen kann. Die eine Drehrichtung dient zum Bohren, die andere zum Losschrauben des Bohrgestänges. In den meisten Ländern wird linksdrehend gebohrt, so dass beim Bohren die Leitung 30 mit Druck beaufschlagt ist. In die Leitungen 30, 31 ist je eine einstellbare Drossel 40 eingebaut sowie ein dazu parallel geschaltetes Rückschlagventil 41, das in Rücklaufrichtung öffnet. Mit den Drosseln 40 lässt sich die Durchflussmenge für die beiden Drehrichtungen separat einstellen. Im Rücklauf vom Ventil 39 zum Anschluss 37 ist eine weitere, einstellbare Drossel 42 eingesetzt.The rotary motor 10 is operated via a three-position four-way valve 39 controlled so that the motor 10 rotate in both directions of rotation can. One direction of rotation is used for drilling, the other for Unscrew the drill pipe. In most countries drilled counterclockwise so that when drilling the line 30 with Pressure is applied. In the lines 30, 31 is adjustable Throttle 40 installed and a parallel to it Check valve 41, which opens in the return direction. With The flow rate for the two can be set in the restrictors 40 Set directions of rotation separately. In the return from valve 39 to Another adjustable throttle 42 is used in connection 37.

    Der Speisedruck zum Schlagwerk 11 wird über ein manuell bedientes Zweistellungs-Ventil 46 gesteuert. In Serie zu diesem Ventil 46 ist ein pilotgestellgesteuertes Zweiweg-Ventil 47 sowie parallel dazu ein handgesteuertes Zweiweg-Ventil 48 geschaltet. Das Ventil 47 kann entweder ein Schaltventil (Auf-Zu-Ventil) oder, wie dargestellt, ein Propotionalventil sein. Der Pilotdruck zum Ventil 47 ist der Rücklaufdruck des Drehwerks zwischen dem Ventil 39 und der Drossel 42.The feed pressure to the striking mechanism 11 is operated manually Two-position valve 46 controlled. In series with this valve 46 is a pilot-controlled two-way valve 47 and in parallel for this purpose, a manually controlled two-way valve 48 is switched. The Valve 47 can either be a switching valve (open-close valve) or, as shown, be a experimental valve. The pilot print for Valve 47 is the return pressure of the slewing gear between the valve 39 and the throttle 42.

    Im Betrieb arbeitet der beschriebene Bohrhammer 9 wie folgt: Im Normalbetrieb ist der Schieber des Ventils 39 in der unteren Stellung, so dass der Speisedruck an der Drossel 40 in der Leitung 30 ansteht und die Leitung 31 an den Rücklauf 37 angeschlossen ist. Das Ventil 46 ist eingeschaltet. Bei laufendem Motor 10 ergibt sich ein Staudruck vor der Drossel 42, so dass auch das Ventil 47 eingeschaltet ist und das Schlagwerk 11 läuft. Falls nun das Bohrgestänge im Gestein festsitzen sollte, stoppt der Motor 10. Damit fällt sofort auch der Pilotdruck zum Ventil 47 ab, so dass dieses ausschaltet und das Schlagwerk 11 stoppt. Um das Bohrgestänge zu lösen, wird der Bohrhammer auf seiner Lafette zurückgezogen. Das Ventil 39 wird ausgeschaltet. Falls erforderlich kann das Schlagwerk durch Zuschalten des Ventils 48 trotz stehendem Motor 10 eingeschaltet werden, damit der Hammer vibriert. Wenn das oft aus mehreren Stangen muffenverschraubte Bohrgestänge demontiert werden soll, wird zunächst die hinterste Bohrstange aus dem Bohrloch ausgefahren und das Bohrgestänge an der Muffe zur zweithintersten Bohrstange mit einer Klemmvorrichtung geklemmt. Nun wird das Ventil 39 in seine obere Stellung geschaltet, so dass ein Drehmoment am Adapter im lösenden Sinne ansteht. Sollte die Gewindeverbindung festsitzen, kann wiederum durch Einschalten der Ventile 46, 48 das Schlagwerk 11 eingeschaltet und die Gewindeverbindung losvibriert werden.In operation, the hammer drill 9 described works as follows: Im Normal operation is the slide of the valve 39 in the lower one Position so that the feed pressure at the throttle 40 in the line 30 is pending and the line 31 connected to the return 37 is. The valve 46 is switched on. While running Engine 10 results in a dynamic pressure upstream of throttle 42, so that the valve 47 is also switched on and the striking mechanism 11 running. If the drill pipe should get stuck in the rock, The engine 10 stops. The pilot pressure also drops immediately Valve 47 off, so that it switches off and the striking mechanism 11 stops. To release the drill pipe, the hammer drill is opened withdrawn his gun carriage. The valve 39 is switched off. If necessary, the hammer mechanism can be activated by switching on the valve 48 be turned on despite the engine 10 stopped, so that Hammer vibrates. If that often screwed together from several rods If the drill pipe is to be dismantled, the The rearmost boring bar is extended from the borehole and the drill pipe on the sleeve to the second rear boring bar with one Clamping device clamped. Now the valve 39 is in its upper Position switched so that a torque on the adapter in the releasing Senses. If the threaded connection is stuck, it can the hammer mechanism 11 again by switching on the valves 46, 48 switched on and the threaded connection vibrated.

    Der beschriebene Hammer ist sehr vielseitig in der Anwendung, weil das Schlagwerk und das Bohrwerk unabhängig voneinander betrieben werden können und trotzdem beim Bohren das Schlagwerk sofort stoppt, wenn das Drehwerk nicht dreht. Damit wird die aufwendige und manchmal unmögliche Demontage eines festgehämmerten, verklemmten Bohrgestänges vermieden. Die Drossel 42 kann so eingestellt werden, dass das Ventil 47 schon abschaltet, bevor der Motor 10 völlig zum Stillstand gekommen ist. Dies ist von Vorteil, weil dadurch ein Festsitzen des Bohrgestänges noch sicherer vermieden wird. Wenn das Ventil 47 als Proportionalventil ausgebildet ist, kann ausserdem erreicht werden, dass die Schlagfrequenz mit wachsender Drehzahl des Motors 10 steigt. Das Verhältnis zwischen Drehzahl und Schlagfrequenz kann mit der Drossel 42 eingestellt werden, was für mehrere Gesteinsarten ein Vorteil ist. Der erfindungsgemässe Bohrhammer ist wesentlich einfacher aufgebaut als der eingangs genannte. Deshalb sind seine Aussenabmessungen geringer, was bei den engen Platzverhältnissen in Vortriebsstollen resp. auf Aufbauten von Fräsmaschinen ein Vorteil ist. Das Schlagwerkventil 17 kann zum Beispiel seitlich angebaut werden, so dass der Bohrhammer 9 näher an der Lafette montiert werden kann. Dadurch werden die beim Bohrvorschub auftretenden Momente kleiner. Weil die hydraulische Koppelung zwischen Drehwerk und Schlagwerk vom Rücklaufdruck des Drehmotors abgeleitet wird, ist sie unabhängig vom Speisedruck zum Drehmotor. Dadurch ist der Bohrhammer sehr flexibel im Einsatz, insbesondere zum Bohren in unterschiedlichen Gesteinsarten, weil der Speisedruck optimal an das zu bohrende Gestein angepasst werden kann. Die beschriebene Schaltung eignet sich ausser für hydraulische auch für pneumatische Antriebe. The hammer described is very versatile in use, because the striking mechanism and the boring machine operated independently of each other can still be the hammer mechanism when drilling stops immediately if the slewing gear does not turn. With that the time-consuming and sometimes impossible disassembly of a hammered, jammed drill pipe avoided. The throttle 42 can do so be set so that the valve 47 switches off before the engine 10 has come to a complete standstill. This is from Advantage, because it makes the drill pipe stick even more securely is avoided. If the valve 47 as a proportional valve trained, can also be achieved that the Beat frequency increases with increasing speed of the motor 10. The Ratio between speed and stroke frequency can with the Throttle 42 can be set, which for several types of rock Advantage is. The hammer drill according to the invention is essential more simply constructed than the one mentioned at the beginning. That is why his External dimensions smaller, which is due to the limited space in tunneling or on superstructures of milling machines an advantage is. The hammer mechanism valve 17 can, for example, laterally be installed so that the hammer drill 9 closer to the carriage can be assembled. This will make the drilling feed occurring moments smaller. Because the hydraulic coupling between slewing gear and striking mechanism from the return pressure of the rotating motor is derived, it is independent of the feed pressure at Rotary engine. This makes the hammer drill very flexible in use, especially for drilling in different rock types because the feed pressure is optimally adapted to the rock to be drilled can be. The circuit described is suitable for hydraulic also for pneumatic drives.

    Die Betätigung der Ventile, insbesondere jener ausserhalb des Bohrhammers 9, kann alternativ zur dargestellten Art hydraulisch, pneumatisch, elektrisch oder von Hand erfolgen.The actuation of the valves, especially those outside the Hammer 9, can alternatively to the type shown hydraulically, pneumatically, electrically or by hand.

    Bei den nachfolgenden Ausführungsbeispielen sind analoge Teile mit gleichen Bezugszeichen versehen, so dass sich eine detaillierte Beschreibung dieser Teile erübrigt.In the following exemplary embodiments, analog parts are used provided with the same reference numerals, so that a detailed No need to describe these parts.

    Bei der Ausführungform nach Figur 2 sind an die beim Bohren als Rückleitung dienende Leitung 31 zwei einstellbare Drosseln 52, 53 angeschlossen. Die Drossel 52 ist mit dem Anschluss A7 des Ventils 39 verbunden, der beim Bohren mit dem Rücklaufanschluss 37 verbunden ist. Die andere Drossel 53 ist über ein einstellbares Überdruckventil 54 mit dem einen Anschluss 56 eines volumetrischen Taktermotors 55 verbunden, dessen anderer Anschluss ebenfalls an den Anschluss A7 angeschlossen ist. Der Taktermotor 55 treibt ein Dreiwege-Takterventil 57, das an die Anschlüsse 36, 38 für das Schlagwerk 11 angeschlossen ist. Der Ausgang des Ventils 57 ist mit der Pilotleitung 21 verbunden.In the embodiment according to FIG. 2, when drilling as Return line 31 serving two adjustable chokes 52, 53 connected. The throttle 52 is connected to the A7 of the valve 39 connected to the return connection during drilling 37 is connected. The other throttle 53 is over one adjustable pressure relief valve 54 with a connection 56 of a volumetric clock motor 55 connected, the other connection is also connected to connection A7. The Clock motor 55 drives a three-way clock valve 57, which is connected to the Connections 36, 38 for the striking mechanism 11 is connected. The The outlet of the valve 57 is connected to the pilot line 21.

    Beim Bohren wird der Rücklaufstrom in der Leitung 31 durch die Drosseln 52, 53 in zwei Teilströme aufgeteilt, von welchen der eine den Motor 55 treibt. Dadurch schaltet das Ventil 17 mit einer Frequenz proportional zur Drehzahl des Motors 10 hin und her, wobei das Verhältnis der Drehzahl zur Schlagfrequenz mit den Drosseln 52, 53 einstellbar ist. Sinkt die Drehzahl stark ab, so sinkt auch der Druck stromaufwärts der Drosseln 52, 53 und deshalb auch stromabwärts der Drossel 53. Bei einer am Ventil 54 einstellbaren Minimaldrehzahl schliesst dieses, so dass der Motor 55 stoppt und das Schlagwerk stillsteht, bevor der Motor 10 ganz gestoppt ist. Dadurch wird das Festklemmen der Bohrkrone oder des Bohrgestänges in den meisten Fällen vermieden.When drilling the return flow in line 31 through the Chokes 52, 53 divided into two partial flows, of which the one drives the motor 55. As a result, the valve 17 switches with a Frequency proportional to the speed of the motor 10 and forth, the ratio of the speed to the stroke frequency with the throttles 52, 53 is adjustable. The speed drops sharply decreases, the pressure upstream of the throttles 52, 53 also drops and therefore also downstream of the throttle 53. With one at the valve 54 adjustable minimum speed closes this so that the motor 55 stops and the striking mechanism stops before the motor 10 is completely stopped. This will clamp the drill bit or the drill pipe avoided in most cases.

    Um bei der Rechtsrotation, das heisst beim Lösen des Gewindes des Bohrgestänges, also wenn am Anschluss A7 des Ventils 39 der Speisedruck ansteht, das Schlagwerk betätigen zu können, ist der Anschluss 56 des Motors 55 zusätzlich über eine Blende 58, ein manuelles Schaltventil 59 sowie ein Rückschlagventil 60 mit der Leitung 30 verbunden. Wenn also am Drehmotor 10 ein Drehmoment im lösenden Sinne ansteht, ohne dass er dreht, das heisst bei festsitzendem Gewinde, kann das Gewinde durch manuelles Einschalten des Schlagwerks 11 losgerüttelt werden. Falls mit dem Bohrhammer 9 im rechtsdrehenden Sinn gebohrt werden soll, was zum Beispiel in Australien der Fall ist, werden die beiden Anschlüsse an den Drehmotor 10 vertauscht.Um with the right rotation, that means when loosening the thread of the drill pipe, that is, if at port A7 of valve 39 the Feed pressure is pending, to be able to operate the striking mechanism is the Connection 56 of the motor 55 additionally via an orifice 58 manual switching valve 59 and a check valve 60 with the Line 30 connected. So if a torque on the rotary motor 10 is in the loosening sense without turning, that is with tight thread, the thread can be switched on manually of the striking mechanism 11 can be shaken off. If with that Rotary hammer 9 is to be drilled in the clockwise sense, what For example, in Australia, the two connections swapped to the rotary motor 10.

    Die Ausführungsform nach Figur 3 ist ähnlich aufgebaut wie jene nach Figur 2. Im Unterschied zu dieser sind die Elemente 52 bis 56 und 58 bis 60 im Bohrhammer 9 eingebaut. Das Ventil 59 ist nicht handgesteuert, sondern über eine Pilotleitung 63 von einem handgesteuerten Ventil 64 pilotgesteuert. Der Taktermotor 55 treibt direkt das Schlagwerkventil 17, ist also in diesem Fall ein Schlagwerk-Ventilmotor. Die Wirkungsweise ist analog zu jener der Ausführungsform nach Figur 2.The embodiment of Figure 3 is constructed similarly to that according to FIG. 2. In contrast to this, the elements 52 to 56 and 58 to 60 installed in the hammer drill 9. The valve 59 is not manually controlled, but via a pilot line 63 from one hand-operated valve 64 pilot operated. The stroke engine 55 drives the hammer mechanism valve 17 directly, so it is in this case a hammer mechanism valve motor. The mode of action is analogous to that the embodiment of Figure 2.

    Claims (10)

    1. Hammer drill comprising a torque motor (10) and an impact tool (11) with an impact tool valve (17), in which a pressure medium can be applied to the torque motor (10) via a first valve (39) and to the impact tool valve (17) via a second valve (46) in a control unit (34), the impact frequency of the impact tool (11) being linked to the speed of the torque motor (10) in such a manner that the impact tool stops when the torque motor is stationary, characterised in that a preferably adjustable throttle (42, 52) is installed in a return line (31, 37) of the torque motor (10) and that the pressure upstream of this throttle (42, 52) is used to control the impact tool (11).
    2. Hammer drill according to claim 1, in which the throttle (42) is installed in a return line of the first valve (39) and in which the pressure upstream of this throttle (42) is connected as a control pressure to a pilot-controlled third valve (47) arranged in one of the two lines (32, 33) to the impact tool valve (17) in order to block this line (32, 33) when the pressure upstream of the throttle (42) falls below a predetermined minimum value.
    3. Hammer drill according to claim 2, in which the third valve (47) is a proportional valve.
    4. Hammer drill according to claim 2 or claim 3, in which a preferably adjustable further throttle (40) with a non-return valve (41) connected in parallel and opening in the return direction is arranged in each of the two lines (30, 31) to the torque motor (10).
    5. Hammer drill according to one of claims 2 to 4, in which a manually directly or remotely operated fourth valve (48) is connected in parallel with the third valve (47).
    6. Hammer drill according to claim 1, in which at least a partial flow in one of the lines (31) to the torque motor (10) is guided via a cadence motor (55) which controls the impact tool valve (17).
    7. Hammer drill according to claim 6, in which a preferably adjustable pressure relief valve (54) is arranged in one of the lines to the cadence motor (55) so that the cadence motor (55) stops before the torque motor (10) stops.
    8. Hammer drill according to claim 6 or claim 7, in which the cadence motor (55) can additionally be acted upon by means of a manually directly or remotely operated third valve (59) via an adjustable further throttle (58).
    9. Hammer drill according to one of claims 6 to 8, in which the cadence motor (55) actuates a cadence valve (57) which controls the impact tool valve (17).
    10. Hammer drill according to one of claims 6 to 8, in which the cadence motor (55) drives the impact tool valve (17) directly.
    EP97810731A 1997-10-03 1997-10-03 Drill hammer Expired - Lifetime EP0906811B1 (en)

    Priority Applications (6)

    Application Number Priority Date Filing Date Title
    AT97810731T ATE217564T1 (en) 1997-10-03 1997-10-03 HAMMER DRILL
    DE59707289T DE59707289D1 (en) 1997-10-03 1997-10-03 Rotary Hammer
    EP97810731A EP0906811B1 (en) 1997-10-03 1997-10-03 Drill hammer
    CA002248697A CA2248697A1 (en) 1997-10-03 1998-09-23 Rock drill
    JP10279567A JPH11159272A (en) 1997-10-03 1998-10-01 Rock drill
    US09/165,862 US6119793A (en) 1997-10-03 1998-10-02 Rock drill

    Applications Claiming Priority (1)

    Application Number Priority Date Filing Date Title
    EP97810731A EP0906811B1 (en) 1997-10-03 1997-10-03 Drill hammer

    Publications (2)

    Publication Number Publication Date
    EP0906811A1 EP0906811A1 (en) 1999-04-07
    EP0906811B1 true EP0906811B1 (en) 2002-05-15

    Family

    ID=8230413

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97810731A Expired - Lifetime EP0906811B1 (en) 1997-10-03 1997-10-03 Drill hammer

    Country Status (6)

    Country Link
    US (1) US6119793A (en)
    EP (1) EP0906811B1 (en)
    JP (1) JPH11159272A (en)
    AT (1) ATE217564T1 (en)
    CA (1) CA2248697A1 (en)
    DE (1) DE59707289D1 (en)

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    CN102425401B (en) * 2011-11-18 2014-05-28 山河智能装备股份有限公司 Electro-hydraulic logic control loop of rock drilling actions of hydraulic rock drilling machine
    SE538237C2 (en) * 2014-07-04 2016-04-12 Lkab Wassara Ab Liquid driven immersion drill with indexing by means of intermittent pressure setting
    CN108194444B (en) * 2018-03-20 2024-02-13 马鞍山唐拓凿岩机械有限公司 Anti-idle-drilling hydraulic system of top hammer drilling machine and control method thereof
    CN112628231B (en) * 2021-01-29 2022-08-02 中铁工程装备集团有限公司 Automatic drilling control valve group, control system and control method thereof

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    Also Published As

    Publication number Publication date
    JPH11159272A (en) 1999-06-15
    US6119793A (en) 2000-09-19
    EP0906811A1 (en) 1999-04-07
    ATE217564T1 (en) 2002-06-15
    CA2248697A1 (en) 1999-04-03
    DE59707289D1 (en) 2002-06-20

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