EP0381921B1 - Control valve for a counter-blow tapping-hole drill - Google Patents

Control valve for a counter-blow tapping-hole drill Download PDF

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Publication number
EP0381921B1
EP0381921B1 EP89890333A EP89890333A EP0381921B1 EP 0381921 B1 EP0381921 B1 EP 0381921B1 EP 89890333 A EP89890333 A EP 89890333A EP 89890333 A EP89890333 A EP 89890333A EP 0381921 B1 EP0381921 B1 EP 0381921B1
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EP
European Patent Office
Prior art keywords
control
piston
valve
air
counter
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
EP89890333A
Other languages
German (de)
French (fr)
Other versions
EP0381921A3 (en
EP0381921A2 (en
Inventor
Hans-Jörg Müller-Späth
Franz Mock
Peter Pacnik
Werner Schantl
Josef Dipl.-Ing. Mocivnik
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.)
BOEHLER DRUCKLUFT UND HYDRAULIK BAUGERAETE GMBH
Original Assignee
Bohler Druckluft und Hydraulik Baugerate GmbH
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Publication of EP0381921A2 publication Critical patent/EP0381921A2/en
Publication of EP0381921A3 publication Critical patent/EP0381921A3/en
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Publication of EP0381921B1 publication Critical patent/EP0381921B1/en
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Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/12—Opening or sealing the tap holes
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/171—Percussive pulling action of tools for extraction of elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87217—Motor
    • Y10T137/87225—Fluid motor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87233—Biased exhaust valve
    • Y10T137/87241—Biased closed

Definitions

  • the invention relates to a control valve for a counterblow tap hole drilling machine, in particular for a pneumatic hammer mechanism for the propulsion, connected to a counterblow mechanism as a pulling device and a rotator for a boring bar or hammer rod, consisting of a control slide, which supplies the main air to the consumer and leads back as exhaust air, whereby a quick exhaust is also provided, which quickly reduces the pressure of the exhaust air.
  • a counterblow taphole drill is used to quickly and safely open the taphole on the frame of a blast furnace.
  • valves have a further disadvantage that when the impact machine or the counter-impact machine is switched off, the kinetic energy in the exhaust air causes it to run on, but can also result from incorrect operation. However, this fact can have serious consequences if the hammer and counterblow hammer work against each other.
  • the object of the invention is to switch off the run-down time when switching from one consumer to the other, so that the consumers do not obstruct and destroy one another.
  • the aim is achieved in that a movable control piston is provided between the housing and the distal end of the shaft of the valve plate provided with a valve plate and axially movable, the main air lockable control spool, an annular piston additionally sealingly engaging between the valve seat and the sealing seat on the control piston .
  • control slide is guided at one end in the cover of the housing and with its distal end in the control piston and is operatively connected to the annular space and control channel at its end face with bores and groove. This creates the possibility that the remaining control air is discharged into the control air duct.
  • a compression spring is located in a recess in the area of the end sealing surfaces of the control piston and the annular piston. This prevents the two pistons from getting stuck, since, for example, they are not dependent on gravity.
  • FIG. 1 shows a counterblow tap hole drilling machine in view
  • FIG. 2 switching valve in section.
  • a counter-impact tap hole drilling machine is shown.
  • the base plate 2 is suspended in a longitudinally displaceable manner on a carrier 1 via rollers 3 and wheel bearings 4.
  • the impact bar 5 leads out of the counter-impact mechanism 7 and can be equipped with various tools.
  • the rotator 8 is operatively connected to the impact rod 5 via a gear mechanism.
  • the impact mechanism 6 is connected to the counter-impact mechanism 7 by a transition piece 9.
  • the individual units are connected to one another by an air connection 10, in particular the control valves 11.
  • the striking mechanism 6 and the counter-hammer mechanism 7 consist of one unit, the striking surfaces of the pistons acting on one another on the head of the transition piece 9.
  • the impact energy is transmitted to the boring bar 5 via the transition piece 9 and the work tool screwed onto the front end of the transition piece.
  • the rotator 8 is available for drilling operation and for releasing the working tools, the torque of which is transmitted to the transition piece 9 via a toothed shaft profile.
  • the air supply to the two striking mechanisms 6, 7 and the rotator 8 takes place with the aid of a valve block, which consists of several valves 11. It is essential that all necessary control lines in the distribution block, i.e. are integrated in the housing of the valves 11. This is advantageous in that the time-consuming closing of the lines can be omitted in the event of any disassembly.
  • the percussion mechanism 6 can be used to predrill using a hollow boring bar and drill bit. Changing the boring bar against beating bar, punching through and then pulling with counter hammer 7. This ensures that a shorter drilling time, longer life of boring bar and crown, no sticking of the beating bar in the tap hole can be guaranteed.
  • valve 11 in the housing 12 of which a central bore is provided, which is closed with a cover 13 and sealed with a sealing ring 26.
  • a cavity 12a is provided in the interior of the housing 12 and is delimited by two opposite valve seats 17 and 19.
  • a consumer duct 23 leads from this cavity 12a, followed by a consumer connector 14, from which further lines lead away.
  • a control slide 15 is axially displaceable, the sealing being effected by means of a valve plate 16 which is fixedly arranged on the shaft and which is in contact with the valve seat 17. With the aid of a guide, the control slide 15 is guided in the cover 13 and sealed by a sealing ring 25, the guide space 30 and a recess 15a serving to receive a compression spring 34.
  • a channel arranged on the side of the housing 12 serves as the main air channel 24 and is connected to the consumer channel 23, provided the valve plate 16 is in an open position.
  • control air duct 21 At the other end of the housing 12 there is a control air duct 21 and the exhaust air duct 22.
  • the control piston 20 is arranged.
  • a seal to the housing 12 is produced by the sealing ring 27.
  • a blind bore is still in the center, in which the axially displaceable shaft of the control slide 15 is guided, the end face 32 is provided with a free space and sealed by a sealing ring 25.
  • a bore 20a is arranged in this control piston 20 and is connected to the annular space 31 via a groove 20b.
  • the control piston 20 is provided with a sealing seat 29.
  • valve seat 19 and sealing seat 29 The space between valve seat 19 and sealing seat 29 is selected so that an annular piston 18 can be axially displaced. This is also sealed with a sealing ring 25 against the shaft of the control slide 15.
  • the exhaust air duct 22 is connected to the intermediate space. With the help of a compression spring 28, the control piston 20 and the annular piston 18 are pressed apart in the unpressurized phase. The control air passes through the control air channel 21 into the annular space 31, as a result of which the control piston 20 is moved from the end position and the control slide 15 through the valve plate 16 from the valve seat 17 takes off.
  • the main air duct 24 is connected to the consumer duct 23. The consumers, hammer mechanism 6, counter hammer mechanism 7 and rotator 8 come into action.
  • control piston 20 The movement of the control piston 20 is limited by the annular piston 18, whereby it is pressed against the sealing seat 19 in the housing 12. This prevents the consumer air from escaping through the exhaust air duct 22. Furthermore, the control air reaches the end face 32 of the control slide 15 via the annular space 31 and the bore 20a, as a result of which the latter is opened completely. The control slide 15 itself is limited in its movement by attachment 33 in the cover 13. The valve is now fully open. So that no air cushion is created in the guide space 30, a vent hole 35 is provided.
  • the residual air from the consumer channel 23 can lift the annular piston 18 from the valve seat 19 and escape through the exhaust air channel; this ensures that the consumption comes to a standstill very quickly and does not hinder the counter-consumer.
  • valves 11 It is also important that a reversal of the rotor 8 is possible by the combination of two valves 11. This is done in such a way that one of the valves 11 is actuated to supply the control air in the previously described mode of operation.
  • the exhaust air from the rotator 8 is fed to the adjacent valve 11 via the consumer line 14.
  • the annular piston 18 By lifting the annular piston 18 as a result of the residual pressure of the return air, the latter can escape via the exhaust air duct 22 into the air outlet.
  • both valves 11 are acted upon alternately by control air, the left and right rotation of the rotator 8 is thus achieved. This is particularly important because an additional exhaust valve is not required because the exhaust valve is integrated in the main air valve.

Abstract

In a control valve for a counter-blow tapping-hole drill, in particular a pneumatic striking mechanism for the driving, combined with a counter-blow mechanism (7) as a withdrawal device as well as a rotator (8) for a drilling or striking rod (5), consisting of control spools (15) which direct the main air to the consuming device and direct it back as exhaust air, in the course of which rapid venting is additionally provided which quickly reduces the pressure of the exhaust air, the axially movable control spool (15), which is provided with a valve disc (16) and can shut off the main air, has at its distal end a control piston (20) movable between housing (12) and shaft of the control spool (15), in which arrangement an annular piston (18) in addition bears alternately in a sealing manner between valve seat (19) and sealing seat (29) on the control piston (20). <IMAGE>

Description

Die Erfindung betrifft ein Steuerventil für eine Gegenschlag-Stichloch-Bohrmaschine, insbesondere für ein pneumatisches Schlagwerk für den Vortrieb, verbunden mit einem Gegenschlagwerk als Ziehvorrichtung sowie einem Rotator für eine Bohr- bzw. Schlagstange, bestehend aus einem Steuerschieber, der die Hauptluft zum Verbraucher und zurück als Abluft führt, wobei zusätzlich eine Schnellentlüftung vorgesehen ist, die den Druck der Abluft rasch abbaut.The invention relates to a control valve for a counterblow tap hole drilling machine, in particular for a pneumatic hammer mechanism for the propulsion, connected to a counterblow mechanism as a pulling device and a rotator for a boring bar or hammer rod, consisting of a control slide, which supplies the main air to the consumer and leads back as exhaust air, whereby a quick exhaust is also provided, which quickly reduces the pressure of the exhaust air.

Eine Gegenschlag-Stichboch-Bohrmaschine dient zum raschen und sicheren Öffnen des Stichloches am Gestell eines Hochofens.A counterblow taphole drill is used to quickly and safely open the taphole on the frame of a blast furnace.

Es ist bekannt, mit Hilfe von Schlagstangen und einem pneumatischen Hammer bzw. Gesteinsbohrmaschine den Hochofen zum Abstich zu öffnen, damit das geschmolzene Roheisen ausfließen kann. Nachteilig ist, daß eine solche Gesteinsbohrmaschine nur einseitig funktioniert. Zum Lockern und Herausziehen der Bohrstange mußte man sich auf manuelle Bedienung verlassen. Man ist deshalb dazu übergegangen, Gegenschlagbohrmaschinen vorzusehen, die in Kombination mit dem Schlaghammer auch ein Herausziehen durch pneumatische Unterstützung der Bohrstange ermöglicht. Dieser zwar verbesserten Bohrmethode haftet noch immer der Nachteil an, daß ein Verdrehen beim Bohren nicht möglich war, so daß zusätzlich ein Rotator notwendig wurde. Diese Aggregate wurden gemeinsam auf einer Lafette montiert und mit Hilfe von Steuerventilen automatisiert. Diese Ventile haben naturgemäß einen weiteren Nachteil, daß beim Abstellen der Schlagmaschine bzw. der Gegenschlagmaschine ein Nachlaufen infolge der kinetischen Energie in der Abluft einhergeht, aber auch durch Fehlbedienung entstehen kann. Dieser Umstand kann aber gravierende Folgen haben, wenn Schlaghammer und Gegenschlaghemmer gegeneinander arbeiten.It is known to open the blast furnace for tapping with the help of beater bars and a pneumatic hammer or rock drill so that the molten pig iron can flow out. The disadvantage is that such a rock drilling machine only works on one side. To loosen and pull out the boring bar, one had to rely on manual operation. It has therefore started to provide counter impact drills which, in combination with the hammer, also allow extraction by pneumatic support of the boring bar. This improved drilling method still has the disadvantage that twisting during drilling was not possible, so that a rotator was also necessary. These units were assembled together on a carriage and automated with the help of control valves. Naturally, these valves have a further disadvantage that when the impact machine or the counter-impact machine is switched off, the kinetic energy in the exhaust air causes it to run on, but can also result from incorrect operation. However, this fact can have serious consequences if the hammer and counterblow hammer work against each other.

Aus der US-A-3708020 ist eine Führung und ein Futter für ein Bohrgestänge bekanntgeworden, wobei einander gegenüberliegende und entgegengesetzt arbeitende Zylinder-Kolbenaggregate Verwendung finden. Um eine Überbelastung des rotierenden Bohrkopfes zu vermeiden, ist in der hydraulichen Versorgung ein Überlastventil vorgesehen, dessen Ventilkörper bzw. Steuerschieber gegen eine Feder verschiebbar ist.From US-A-3708020 a guide and a chuck for a drill pipe has become known, using opposing and oppositely operating cylinder-piston units Find. In order to avoid overloading the rotating drill head, an overload valve is provided in the hydraulic supply, the valve body or control slide of which can be moved against a spring.

Ausgehend von dem eingangs erläuterten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, beim Umschalten von einem zum anderen Verbraucher die Auslaufzeit auszuschalten, damit sich die Verbraucher nicht gegenseitig behindern und zerstören. Erfindungsgemäß wird das Ziel dadurch erreicht, daß zwischen Gehäuse und dem vom Ventilteller distalen Ende des Schaftes des mit einem Ventilteller versehenen, axial bewegbaren, die Hauptluft verschließbaren Steuerschiebers ein beweglicher Steuerkolben vorgesehen ist, wobei zusätzlich ein Ringkolben abwechsend dichtend zwischen Ventilsitz und Dichtsitz am Steuerkolben anliegt. Dadurch wird erreicht, daß beim Umschalten des Ventils von einem Verbraucher zum anderen die kinetische Energie, d.h. die unter Druck stehende Restluft, schlagartig entweichen kann und somit ein Gegeneinanderschlagen der beiden Kolben bzw. deren Kolbenstangen vermieden wird.On the basis of the prior art explained at the outset, the object of the invention is to switch off the run-down time when switching from one consumer to the other, so that the consumers do not obstruct and destroy one another. According to the invention the aim is achieved in that a movable control piston is provided between the housing and the distal end of the shaft of the valve plate provided with a valve plate and axially movable, the main air lockable control spool, an annular piston additionally sealingly engaging between the valve seat and the sealing seat on the control piston . This ensures that when switching the valve from one consumer to another, the kinetic energy, i.e. the pressurized residual air can escape suddenly, thus preventing the two pistons or their piston rods from hitting each other.

Es ist besonders von Vorteil, wenn der Steuerschieber an einem Ende im Deckel des Gehäuses und mit seinem distalen Ende im Steuerkolben geführt ist und an seiner Stirnfläche mit Bohrungen und Nut mit dem Ringraum und Steuerkanal in Wirkverbindung steht. Damit ist die Möglichkeit geschaffen, daß die verbleibende Steuerluft in den Steuerluftkanal abgeführt wird.It is particularly advantageous if the control slide is guided at one end in the cover of the housing and with its distal end in the control piston and is operatively connected to the annular space and control channel at its end face with bores and groove. This creates the possibility that the remaining control air is discharged into the control air duct.

Weiters ist es von Vorteil, wenn in einer Aussparung im Bereich der stirnseitigen Dichtflächen des Steuerkolbens und des Ringkolbens eine Druckfeder liegt. Damit kann ein Hängenbleiben der beiden Kolben vermieden werden, da diese z.B. nicht von der Schwerkraft abhängig sind.It is also advantageous if a compression spring is located in a recess in the area of the end sealing surfaces of the control piston and the annular piston. This prevents the two pistons from getting stuck, since, for example, they are not dependent on gravity.

An Hand eines Ausführungsbeispiels sei die Erfindung näher erläutert. Es zeigen: Fig. 1 Gegenschlag-Stichloch-Bohrmaschine in Ansicht, Fig. 2 Schaltventil im Schnitt.The invention will be explained in more detail using an exemplary embodiment. 1 shows a counterblow tap hole drilling machine in view, FIG. 2 switching valve in section.

In Fig. 1 ist in Ansicht eine Gegenschlag-Stichloch-Bohrmaschine dargestellt. An einem Träger 1 ist über Rollen 3 und Radlager 4 die Grundplatte 2 längsverschiebbar aufgehängt. Die Schlagstange 5 führt aus dem Gegenschlagwerk 7 heraus und ist mit verschiedenen Werkzeugen bestückbar. Über ein Getriebe ist der Rotator 8 in Wirkverbindung mit der Schlagstange 5. Das Schlagwerk 6 ist mit einem Übergangsstück 9 mit dem Gegenschlagwerk 7 verbunden. Von einem Luftanschluß 10 sind die einzelnen Aggregate miteinander in Verbindung, insbesondere die Steuerventile 11. Das Schlagwerk 6 und das Gegenschlagwerk 7 bestehen aus einer Einheit, wobei die Schlagflächen der Kolben zueinander auf den Kopf des Übergangsstückes 9 einwirken. Die Schlagenergie wird über das Übergangsstück 9 und dem am vorderen Ende des Übergangsstückes aufgeschraubten Arbeitswerkzeug auf die Bohr- bzw.Schlagstange 5 übertragen. Für den Bohrbetrieb und zum Lösen der Arbeitswerkzeuge steht der Rotator 8 zur Verfügung, dessen Drehmoment über ein Zahnwellenprofil auf das Übergangsstück 9 übertragen wird. Die Luftversorgung der beiden Schlagwerke 6, 7 und des Rotators 8 erfolgt mit Hilfe eines Ventilblocks, der aus mehreren Ventilen 11 besteht. Wesentlich ist, daß alle notwendigen Steuerleitungen im Verteilblock, d.h. im Gehäuse der Ventile 11 integriert sind. Dies ist insofern von Vorteil, da bei eventuellen Demontagen das zeitraubende Abschließen der Leitungen entfallen kann. Mit dieser Bohreinheit kann man durch das Schlagwerk 6 ein Vorbohren mittels Hohlbohrstange und Bohrkrone erzielen. Wechseln der Bohrstange gegen Schlagstange, Durchschlagen und danach Ziehen mittels Gegenschlagwerks 7. Damit wird erreicht, daß eine kürzere Bohrzeit, längere Lebensdauer von Bohrstange und Krone, kein Hängenbleiben der Schlagstange im Stichloch, garantiert werden kann.In Fig. 1, a counter-impact tap hole drilling machine is shown. The base plate 2 is suspended in a longitudinally displaceable manner on a carrier 1 via rollers 3 and wheel bearings 4. The impact bar 5 leads out of the counter-impact mechanism 7 and can be equipped with various tools. The rotator 8 is operatively connected to the impact rod 5 via a gear mechanism. The impact mechanism 6 is connected to the counter-impact mechanism 7 by a transition piece 9. The individual units are connected to one another by an air connection 10, in particular the control valves 11. The striking mechanism 6 and the counter-hammer mechanism 7 consist of one unit, the striking surfaces of the pistons acting on one another on the head of the transition piece 9. The impact energy is transmitted to the boring bar 5 via the transition piece 9 and the work tool screwed onto the front end of the transition piece. The rotator 8 is available for drilling operation and for releasing the working tools, the torque of which is transmitted to the transition piece 9 via a toothed shaft profile. The air supply to the two striking mechanisms 6, 7 and the rotator 8 takes place with the aid of a valve block, which consists of several valves 11. It is essential that all necessary control lines in the distribution block, i.e. are integrated in the housing of the valves 11. This is advantageous in that the time-consuming closing of the lines can be omitted in the event of any disassembly. With this drilling unit, the percussion mechanism 6 can be used to predrill using a hollow boring bar and drill bit. Changing the boring bar against beating bar, punching through and then pulling with counter hammer 7. This ensures that a shorter drilling time, longer life of boring bar and crown, no sticking of the beating bar in the tap hole can be guaranteed.

Die Fig. 2 zeigt im Schnitt ein Ventil 11, in dessen Gehäuse 12 eine zentrale Bohrung vorgesehen ist, die mit einem Deckel 13 abgeschlossen und mit Dichtring 26 abgedichtet ist.2 shows in section a valve 11, in the housing 12 of which a central bore is provided, which is closed with a cover 13 and sealed with a sealing ring 26.

Im Inneren des Gehäuses 12 ist ein Hohlraum 12a vorgesehen, der von zwei gegenüberliegenden Ventilsitzen 17 und 19 begrenzt ist. Aus diesem Hohlraum 12a führt ein Verbraucherkanal 23 mit anschließendem Verbraucherstutzen 14, wovon weitere Leitungen wegführen. Ein Steuerschieber 15 ist axial verschiebbar, wobei durch einen fest am Schaft angeordneten Ventilteller 16 am Ventilsitz 17 anliegend, die Abdichtung erfolgt. Mit Hilfe einer Führung ist der Steuerschieber 15 im Deckel 13 geführt und durch Dichtring 25 abgedichtet, wobei der Führungsraum 30 und eine Aussparung 15a zur Aufnahme einer Druckfeder 34 dient. Ein seitlich am Gehäuse 12 angeordneter Kanal dient als Hauptluftkanal 24 und ist mit dem Verbraucherkanal 23 verbunden, sofern der Ventilteller 16 in einer Offenstellung ist. Am anderen Ende des Gehäuses 12 ist ein Steuerluftkanal 21 und der Abluftkanal 22. Im Bereich des Steuerluftkanals 21, der seitlich in das Gehäuse 12 führt, ist der Steuerkolben 20 angeordnet. Durch Dichtring 27 wird eine Abdichtung zum Gehäuse 12 hergestellt. Ferner ist noch im Zentrum eine Sackbohrung, in der der axial verschiebbare Schaft des Steuerschiebers 15 geführt, die Stirnfläche 32 mit einem Freiraum versehen und durch Dichtring 25 abgedichtet. Am oberen Ende des Steuerkolbens 20 ist ein Ansatz, damit ein Ringraum 31 verbleibt. Gleichzeitig ist in diesem Steuerkolben 20 eine Bohrung 20a angeordnet, welche über einer Nut 20b mit dem Ringraum 31 verbunden ist. Weiters ist der Steuerkolben 20 mit einem Dichtsitz 29 versehen. Zwischen Ventilsitz 19 und Dichtsitz 29 ist der Zwischenraum so gewählt, daß ein Ringkolben 18 axial verschiebbar Platz findet. Auch dieser ist mit einem Dichtring 25 gegenüber dem Schaft des Steuerschiebers 15 abgedichtet. An dem Zwischenraum ist der Abluftkanal 22 angeschlossen. Mit Hilfe einer Druckfeder 28 wird der Steuerkolben 20 und der Ringkolben 18 in der drucklosen Phase auseinandergedrückt. Die Steuerluft gelangt über den Steuerluftkanal 21 in den Ringraum 31, wodurch der Steuerkolben 20 aus der Endstellung bewegt wird und den Steuerschieber 15 durch Ventilteller 16 vom Ventilsitz 17 abhebt. Der Hauptluftkanal 24 ist mit dem Verbraucherkanal 23 verbunden. Die Verbraucher, Schlagwerk 6, Gegenschlagwerk 7 und Rotator 8 treten in Aktion. Die Bewegung des Steuerkolbens 20 wird begrenzt durch den Ringkolben 18, wodurch dieser gegen den Dichtsitz 19 im Gehäuse 12 gedrückt wird. Dadurch wird verhindert, daß die Verbraucherluft über den Abluftkanal 22 entweichen kann. Weiters gelangt die Steuerluft über den Ringraum 31 und der Bohrung 20a auf die Stirnfläche 32 des Steuerschiebers 15, wodurch dieser vollständig geöffnet wird. Der Steuerschieber 15 selbst wird durch Ansatz 33 im Deckel 13 in seiner Bewegung begrenzt. Das Ventil ist nun voll geöffnet. Damit kein Luftpolster im Führungsraum 30 entsteht, ist eine Entlüftungsbohrung 35 vorgesehen.A cavity 12a is provided in the interior of the housing 12 and is delimited by two opposite valve seats 17 and 19. A consumer duct 23 leads from this cavity 12a, followed by a consumer connector 14, from which further lines lead away. A control slide 15 is axially displaceable, the sealing being effected by means of a valve plate 16 which is fixedly arranged on the shaft and which is in contact with the valve seat 17. With the aid of a guide, the control slide 15 is guided in the cover 13 and sealed by a sealing ring 25, the guide space 30 and a recess 15a serving to receive a compression spring 34. A channel arranged on the side of the housing 12 serves as the main air channel 24 and is connected to the consumer channel 23, provided the valve plate 16 is in an open position. At the other end of the housing 12 there is a control air duct 21 and the exhaust air duct 22. In the region of the control air duct 21, which leads laterally into the housing 12, the control piston 20 is arranged. A seal to the housing 12 is produced by the sealing ring 27. Furthermore, a blind bore is still in the center, in which the axially displaceable shaft of the control slide 15 is guided, the end face 32 is provided with a free space and sealed by a sealing ring 25. At the upper end of the control piston 20 there is an extension so that an annular space 31 remains. At the same time, a bore 20a is arranged in this control piston 20 and is connected to the annular space 31 via a groove 20b. Furthermore, the control piston 20 is provided with a sealing seat 29. The space between valve seat 19 and sealing seat 29 is selected so that an annular piston 18 can be axially displaced. This is also sealed with a sealing ring 25 against the shaft of the control slide 15. The exhaust air duct 22 is connected to the intermediate space. With the help of a compression spring 28, the control piston 20 and the annular piston 18 are pressed apart in the unpressurized phase. The control air passes through the control air channel 21 into the annular space 31, as a result of which the control piston 20 is moved from the end position and the control slide 15 through the valve plate 16 from the valve seat 17 takes off. The main air duct 24 is connected to the consumer duct 23. The consumers, hammer mechanism 6, counter hammer mechanism 7 and rotator 8 come into action. The movement of the control piston 20 is limited by the annular piston 18, whereby it is pressed against the sealing seat 19 in the housing 12. This prevents the consumer air from escaping through the exhaust air duct 22. Furthermore, the control air reaches the end face 32 of the control slide 15 via the annular space 31 and the bore 20a, as a result of which the latter is opened completely. The control slide 15 itself is limited in its movement by attachment 33 in the cover 13. The valve is now fully open. So that no air cushion is created in the guide space 30, a vent hole 35 is provided.

Durch Wegfall der Andrückkraft, die vom Steuerkolben 20 auf den Ringkolben 18 wirkt, kann die Restluft aus dem Verbraucherkanal 23 den Ringkolben 18 vom Ventilsitz 19 abheben und über den Abluftkanal entweichen; dadurch ist gewährleistet, daß der Verbrauche sehr schnell zum Stillstand kommt und den Gegenverbraucher nicht behindert.By eliminating the pressing force that acts on the annular piston 18 from the control piston 20, the residual air from the consumer channel 23 can lift the annular piston 18 from the valve seat 19 and escape through the exhaust air channel; this ensures that the consumption comes to a standstill very quickly and does not hinder the counter-consumer.

Wesentlich ist noch, daß durch die Kombination von zwei Ventilen 11 eine Umsteuerung des Rotors 8 möglich ist. Dies geschieht in der Weise, daß einem der Ventile 11 durch Betätigen, die Steuerluft in der vorhin beschriebenen Funktionsweise zugeführt wird. Die Abluft des Rotators 8 wird über Verbraucherleitung 14 dem benachbarten Ventil 11 zugeführt. Durch Abheben des Ringkolbens 18 infolge Restdrucks der Rückluft kann dieser über den Abluftkanal 22 in den Luftauslaß entweichen. Bei wechselseitiger Beaufschlagung beider Ventile 11 durch Steuerluft wird somit der Links- bzw. Rechtslauf des Rotators 8 erreicht. Dies ist besonders wichtig, weil ein zusätzliches Abluftventil nicht erforderlich ist, weil das Abluftventil in dem Hauptluftventil integriert ist.It is also important that a reversal of the rotor 8 is possible by the combination of two valves 11. This is done in such a way that one of the valves 11 is actuated to supply the control air in the previously described mode of operation. The exhaust air from the rotator 8 is fed to the adjacent valve 11 via the consumer line 14. By lifting the annular piston 18 as a result of the residual pressure of the return air, the latter can escape via the exhaust air duct 22 into the air outlet. When both valves 11 are acted upon alternately by control air, the left and right rotation of the rotator 8 is thus achieved. This is particularly important because an additional exhaust valve is not required because the exhaust valve is integrated in the main air valve.

Claims (3)

  1. A control valve for a counterblow tap hole drilling machine, in particular for a pneumatic impact mechanism (6) for the feed, connected with a counterblow mechanism (7) as the pulling device, and also with a rotator (8) for a boring or impact bar (5), comprising a control slide (15) which directs primary air to the consuming device and back as waste air, wherein additionally rapid ventilation is provided which quickly reduces the pressure of the waste air, characterised in that a movable control piston (20) is provided between the housing (12) and the end of the stem of the axially movable control slide (15) remote from the valve disc (16), which is provided with a valve disc (16) and which can shut off the primary air, wherein additionally an annular piston (18) is applied so as to effect a seal alternately between the valve seat (19) and the sealing seat (29) on the control piston (20).
  2. A control valve according to Claim 1, characterised in that the control slide (15) at one end is guided in the cover (13) of the housing (12) and at its distal end is guided in the control piston (20), and at its end face (32) is in operative connection through bores (20a) and a groove (20b) with the annular chamber (31) and the air control passage (21).
  3. A control valve according to Claim 1 or 2, characterised in that a compression spring (28) is disposed in a recess in the vicinity of the end-face sealing surfaces of the control piston (20) and of the annular piston (18).
EP89890333A 1988-12-29 1989-12-28 Control valve for a counter-blow tapping-hole drill Expired - Lifetime EP0381921B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT3186/88 1988-12-29
AT0318688A AT391348B (en) 1988-12-29 1988-12-29 CONTROL VALVE FOR A COUNTERBACK STITCH HOLE DRILL

Publications (3)

Publication Number Publication Date
EP0381921A2 EP0381921A2 (en) 1990-08-16
EP0381921A3 EP0381921A3 (en) 1991-04-03
EP0381921B1 true EP0381921B1 (en) 1994-04-20

Family

ID=3546677

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89890333A Expired - Lifetime EP0381921B1 (en) 1988-12-29 1989-12-28 Control valve for a counter-blow tapping-hole drill

Country Status (4)

Country Link
US (1) US5044398A (en)
EP (1) EP0381921B1 (en)
AT (2) AT391348B (en)
DE (1) DE58907518D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6637462B2 (en) * 2001-05-02 2003-10-28 Ross Operating Valve Company Variable pressure control device
SE536562C2 (en) * 2012-06-28 2014-02-25 Atlas Copco Rock Drills Ab Device and method of a hydraulic rock drill and rock drill

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6600072A (en) * 1966-01-04 1967-07-05
US3708020A (en) * 1971-01-15 1973-01-02 J Adamson Continuous feed head drill assembly
AU469440B2 (en) * 1971-08-05 1976-02-12 Pongrass Bros. (Engineering) Pty. Ltd Pressurised air dust cleaner
US3828862A (en) * 1971-09-22 1974-08-13 Lemand Eng Ltd Travelling overhead carriage mining machine with articulated,tool carrying boom
US4561464A (en) * 1984-11-07 1985-12-31 Roanoke College Relay valve

Also Published As

Publication number Publication date
EP0381921A3 (en) 1991-04-03
ATE104742T1 (en) 1994-05-15
US5044398A (en) 1991-09-03
DE58907518D1 (en) 1994-05-26
AT391348B (en) 1990-09-25
ATA318688A (en) 1990-03-15
EP0381921A2 (en) 1990-08-16

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