EP0181318B1 - Device for feeding water under pressure to the nozzles at the periphery of a coal cutting tool - Google Patents

Device for feeding water under pressure to the nozzles at the periphery of a coal cutting tool Download PDF

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Publication number
EP0181318B1
EP0181318B1 EP19850890264 EP85890264A EP0181318B1 EP 0181318 B1 EP0181318 B1 EP 0181318B1 EP 19850890264 EP19850890264 EP 19850890264 EP 85890264 A EP85890264 A EP 85890264A EP 0181318 B1 EP0181318 B1 EP 0181318B1
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EP
European Patent Office
Prior art keywords
bit
casing
valve
stem
chisel
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Expired
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EP19850890264
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German (de)
French (fr)
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EP0181318A1 (en
Inventor
Wilfried Maier
Franz Dipl.-Ing. Schöffmann
Herwig Wrulich
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Voestalpine AG
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Voestalpine AG
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Publication of EP0181318A1 publication Critical patent/EP0181318A1/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/187—Mining picks; Holders therefor with arrangement of fluid-spraying nozzles

Definitions

  • the invention relates to a device for supplying water under pressure to outlet nozzles on the periphery of a cutting tool, which is equipped with chisels, the shafts of which are axially displaceably mounted in chisel holders, the water emerging from the nozzles depending on the displacement movement of the chisel and the volume of water to be sprayed out Space in the chisel holder can be fed via a check valve into which the chisel shaft or a part connected to it is immersed.
  • DE-A-3242137 has already disclosed an embodiment of the type mentioned at the outset, in which a space behind the chisel is supplied with water via a check valve.
  • the immersion of the chisel leads to the check valve being closed and to a pressure build-up in the enclosed liquid, which is subsequently expelled via a pressure relief valve and a nozzle.
  • the invention now aims to develop a device of the type mentioned in such a way that, with the shortest possible axial length, a functionally reliable design with the possibility of wide adaptation to the given water supply pressure can be created, with which a large volume can be ejected with a small chisel stroke and if necessary, an adjustable damping of the chisel stroke can be realized.
  • the invention consists essentially in the fact that the check valve and the valve spring are arranged in a sleeve, which is overlapped by a hollow cylindrical part of the chisel shaft or a part connected to it in a force-locking manner when the chisel is immersed, the between the hollow cylindrical part of the Chisel shaft and rifle liquid throttled out during the chisel stroke.
  • the volume that can be sprayed out is composed of the volume of the annular space surrounding the sleeve and the cavity that engages over the sleeve when immersed.
  • a large volume can thus be pressed out with a small axial stroke, such a design offering the possibility, as corresponds to a preferred embodiment of the invention, of supporting the valve spring against a spring plate detachably connected to the sleeve, in particular a screw-in cover.
  • a spring plate detachably connected to the sleeve, in particular a screw-in cover.
  • Such a releasable spring plate allows the valve spring to be exchanged in a simple manner and thus the check valve to be adapted to different supply pressures for the water.
  • openings in particular an axial bore, can be arranged in this detachable spring plate, the bushing then at least one radial opening into the space surrounding the bushing at a distance from the spring plate having.
  • the hollow cylindrical part of the chisel shaft or the part connected to this with a positive fit overlaps the bushing almost without play or with the formation of a throttle ring gap
  • a throttle cross-section or throttle ring gap should remain between the outer wall of the bush and the hollow cylindrical part spanning the bush.
  • the damping does not have to be from the start, i. H. be provided from the beginning of the insertion stroke, but can be used in this case when the edge of the hollow cylindrical part grinds over the upper edge of the sleeve.
  • the bushing is connected to a preferably screw-in cover for a sleeve.
  • the sleeve is integrally connected to this sleeve and is formed coaxially therewith, with the chisel shaft or a non-positively connected part being sealingly guided in the sleeve and a central water supply hole being provided on the end cover for the valve seat of the check valve arranged at the base of the sleeve is.
  • the axial stroke of the chisel shaft is advantageously limited by separate stops, the maximum stroke of the chisel shaft into the interior of the chisel holder being smaller than the maximum stroke of the force-fit with the chisel shaft connected part in the interior of the sleeve.
  • the chisel shaft always strikes the base or the corresponding stop first, and no forces act on the ram, which could lead to deformation of the same or the sleeve.
  • the nozzle is advantageously connected to the space for the volume to be sprayed out via a channel and at least one radial opening in the sleeve.
  • the nozzle either has a throttle cross-section to ensure that when the plunger moves in rapidly, the check valve is actually closed securely first before liquid is expelled and to ensure that a corresponding pressure for squeezing out liquid is reached.
  • a pressure relief valve can also be arranged in the line to the nozzle or in the nozzle itself. The arrangement of such a pressure relief valve in the nozzle itself in turn allows for simple removal, adjustment and replacement of the individual parts.
  • the pressure relief valve is preferably arranged in the nozzle body and is supported against an adjustable spring plate or valve seat in the nozzle body.
  • a chisel 1 which is designed as a round chisel, is slidably received in a collar bush 3 pressed into a chisel holder 2 in the direction of its axis 4.
  • the maximum stroke of the chisel is designated a and is limited by a stop on the collar of the sleeve 3.
  • a spring 5 is provided which engages in a lateral recess 6 of the chisel shaft 7.
  • a ram 8 is non-positively connected to this chisel shaft 7 and is guided in a sleeve 9 in a sliding and sealing manner.
  • the plunger 8 has a cylindrical cavity 10 which engages over a bush 11 when the chisel is immersed.
  • a check valve 12 is arranged, the valve spring is designated 13.
  • the spring plate of this valve spring is designed as a screw-in cover 14 for the bush 11 and has a central bore 15.
  • the bushing 11 has radial openings 16 near the valve seat 17, via which the water pressed in via the opening 15 is pressed into the surrounding annular space 18.
  • the inside diameter b of the hollow cylindrical space 10 in the plunger 8 is essentially the same as the outside diameter of the bush 11, so that when the plunger 8 overlaps the bush 11, the majority of the water squeezed out of the cylindrical cavity 10 actually via the bore 15 and the radial bores 16 is pressed into the annular space 18.
  • the bore 15 can thus be designed as a throttle cross section and allows the stroke of the chisel to be damped in a corresponding manner. Due to the interchangeability of the spring plate 14, different spring plates with different clear cross sections of the openings 15 can be provided in order to achieve an adaptation to the needs. It is just as easy to replace the spring 13 or to regulate the preload by screwing the spring plate more or less far or by inserting washers.
  • the sleeve 9 has radial openings 19, into which channels 20 open for supplying the pressure medium to a nozzle 21.
  • the nozzle 21 consists of a nozzle body 22 which contains a pressure relief valve 23.
  • the pressure relief valve 23 is supported against a valve spring 24, the valve seat 25 being provided on a screw-in part 26 which is screwed into the nozzle body 22.
  • a screw-in part 26 which is screwed into the nozzle body 22.
  • the outward stroke of the plunger 8 in the sleeve 9 is limited by stops 28, so that the chisel can be exchanged independently of an existing liquid pressure.
  • the water is supplied via a central bore 29, the valve seat 17 of the check valve being provided in an end cover 30, which can be removed together with the bush 11. In this way, maintenance work and adjustment work are made considerably easier.
  • the front end of the plunger 8 which comes into contact with the chisel shank 7 is formed from an impact-resistant material and is designated by 31.
  • the stroke a is smaller than the maximum stroke of the plunger 8, so that there is no fear of the plunger being deformed by the force of the chisel.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Percussive Tools And Related Accessories (AREA)

Description

Die Erfindung bezieht sich auf eine Einrichtung zur Zuführung von Wasser unter Druck zu Austrittsdüsen am Umfang eines Schrämwerkzeuges, welches mit Meisseln bestückt ist, deren Schäfte axial verschiebbar in Meisselhaltern gelagert sind, wobei der Wasseraustritt aus den Düsen in Abhängigkeitvonderverschiebebewegungdes Meissels erfolgt und das auszuspritzende Wasservolumen einem Raum im Meisselhalter über ein Rückschlagventit zuführbar ist, in welchen der Meisselschaft oder ein mit diesem verbundener Teil eintaucht.The invention relates to a device for supplying water under pressure to outlet nozzles on the periphery of a cutting tool, which is equipped with chisels, the shafts of which are axially displaceably mounted in chisel holders, the water emerging from the nozzles depending on the displacement movement of the chisel and the volume of water to be sprayed out Space in the chisel holder can be fed via a check valve into which the chisel shaft or a part connected to it is immersed.

Aus der EP-A 99 350 ist ein mit einer Sprühvorrichtung ausgestatteter Meisselhalter bekanntgeworden, bei dem ein Ventilkegel vom Ende des Meisselschaftes übergriffen wird. Durch den Meisselhub wird das Ventil von seinem Sitz abgehoben, wodurch Flüssigkeit zu den am Meisselhalter angeordneten Düsen gelangen kann.From EP-A 99 350 a chisel holder equipped with a spray device has become known, in which a valve cone is overlapped by the end of the chisel shaft. The valve is lifted from its seat by the chisel lift, as a result of which liquid can reach the nozzles arranged on the chisel holder.

Aus der DE-A-3242137 ist bereits eine Ausbildung der eingangs genannten Art bekannt geworden, bei welcher ein hinter dem Meissel liegender Raum über ein Rückschlagventil mit Wasser versorgt wird. Bei dieser bekannten Ausbildung führt das Eintauchen des Meissels zu einem Verschliessen des Rückschlagventiles und zu einem Druckaufbau in der eingeschlossenen Flüssigkeit, welche in der Folge über ein Überdruckventil und eine Düse ausgestossen wird.DE-A-3242137 has already disclosed an embodiment of the type mentioned at the outset, in which a space behind the chisel is supplied with water via a check valve. In this known design, the immersion of the chisel leads to the check valve being closed and to a pressure build-up in the enclosed liquid, which is subsequently expelled via a pressure relief valve and a nozzle.

Die Erfindung zielt nun darauf ab, eine Einrichtung der eingangs genannten Art dahingehend weiterzubilden, dass bei möglichst kurzer axialer Baulänge eine funktionssichere Ausbildung mit der Möglichkeit einer weiten Anpassung an den gegebenen Wasserzuführungsdruck zu schaffen, bei welcher bei kleinem Meisselhub ein grosses Volumen ausgestossen werden kann und gegebenenfalls eine einstellbare Dämpfung des Meisselhubes realisiert werden kann. Zur Lösung dieser Aufgabe besteht die Erfindung im wesentlichen darin, dass das Rückschlagventil und die Ventilfeder in einer Büchse angeordnet sind, welche von einem hohlzylindrischen Teil des Meisselschaftes oder eines mit diesem kraftschlüssig verbundenen Teiles beim Eintauchen des Meissels übergriffen wird, wobei die zwischen hohlzylindrischem Teil des Meisselschaftes und der Büchse befindliche Flüssigkeit beim Meisselhub gedrosselt ausströmt. Dadurch, dass das Rückschlagventil und die Ventilfeder in einer Büchse angeordnetsind, welche in den mit Flüssigkeit füllbaren Raum eintaucht und vom Meissel bzw. einem mit dem Meissel kraftschlüssig verbundenen Teil beim Eintauchen desselben übergriffen wird, kann bei geringster Bauhöhe auch eine entsprechend stark dimensionierte Feder untergebracht werden, wie sie für das Schliessen des Rückschlagventiles bei hohem Zuführungsdruck erforderlich ist. Dadurch, dass die zwischen hohlzylindrischem Teil des Meisselschaftes und der Büchse befindliche Flüssigkeit beim Meisselhub gedrosselt ausströmt, wird eine Dämpfung des Meisselhubes erzielt. Das Volumen, welches ausgespritzt werden kann, setzt sich hiebei aus dem Volumen des die Büchse umgebenden Ringraumes und dem Hohlraum zusammen, welcher beim Eintauchen die Büchse übergreift. Es kann somit bei geringem axialen Hub ein grosses Volumen ausgepresst werden, wobei eine derartige Ausbildung die Möglichkeit bietet, wie dies einer bevorzugten Ausführung der Erfindung entspricht, die Ventilfeder gegen einen mit der Büchse lösbar verbundenen Federteller, insbesondere einen einschraubbaren Deckel, abzustützen. Ein derartiger lösbarer Federteller erlaubt in einfacher Weise den Austausch der Ventilfeder und damit die Anpassung des Rückschlagventiles an verschiedene Zuführungsdrücke für das Wasser.The invention now aims to develop a device of the type mentioned in such a way that, with the shortest possible axial length, a functionally reliable design with the possibility of wide adaptation to the given water supply pressure can be created, with which a large volume can be ejected with a small chisel stroke and if necessary, an adjustable damping of the chisel stroke can be realized. To achieve this object, the invention consists essentially in the fact that the check valve and the valve spring are arranged in a sleeve, which is overlapped by a hollow cylindrical part of the chisel shaft or a part connected to it in a force-locking manner when the chisel is immersed, the between the hollow cylindrical part of the Chisel shaft and rifle liquid throttled out during the chisel stroke. Due to the fact that the check valve and the valve spring are arranged in a sleeve which is immersed in the liquid-fillable space and is overlapped by the chisel or a part which is non-positively connected to the chisel when it is immersed, a correspondingly strongly dimensioned spring can also be accommodated with the smallest overall height as required for closing the check valve at high supply pressure. The fact that the liquid located between the hollow cylindrical part of the chisel shaft and the bushing flows out throttled during the chisel stroke results in damping of the chisel stroke. The volume that can be sprayed out is composed of the volume of the annular space surrounding the sleeve and the cavity that engages over the sleeve when immersed. A large volume can thus be pressed out with a small axial stroke, such a design offering the possibility, as corresponds to a preferred embodiment of the invention, of supporting the valve spring against a spring plate detachably connected to the sleeve, in particular a screw-in cover. Such a releasable spring plate allows the valve spring to be exchanged in a simple manner and thus the check valve to be adapted to different supply pressures for the water.

Mit der Massnahme eines einschraubbaren Federtellers bzw. Deckels wird aber weiters der Vorteil erzielt, dass in diesem lösbaren Federteller Durchbrechungen, insbesondere eine axiale Bohrung, angeordnet sein können, wobei die Büchse dann in Abstand vom Federteller wenigstens eine radiale Durchbrechung in den die Büchse umgebenden Raum aufweist. Wenn, wie es einer bevorzugten Ausführung der erfindungsgemässen Einrichtung entspricht, der hohlzylindrische Teil des Meisselschaftes bzw. des kraftschlüssig mit diesem verbundenen Teiles die Büchse nahezu spielfrei bzw. unter Ausbildung eines Drosselringspaltes übergreift, lässt sich durch Wahl des lichten Querschnittes der Durchbrechungen im lösbaren Federteller eine Drosselwirkung erzielen, welche den Einschubhub des Meissels bzw. des mit dem Meisselschaft kraftschlüssig verbundenen Teiles dämpft. Da der Federteller lösbar mit der Büchse verbunden ist, lässt sich dieser Teil gleichfalls leicht auswechseln und es kann das Dämpfungsverhalten des Einschubhubes in weiten Grenzen verstellt werden. Um den lichten Querschnitt der Durchbrechungen im lösbaren Federteller zu diesem Zwecke voll wirksam werden zu lassen, soll zwischen der Aussenwand der Büchse und dem die Büchse übergreifenden hohlzylindrischen Teil gleichfalls lediglich ein Drosselquerschnitt bzw. Drosselringspalt verbleiben. Die Dämpfung muss hiebei nicht von Anfang an, d. h. ab Beginn des Einschubhubes, vorgesehen sein, sondern kann in diesem Falle dann einsetzen, wenn der Rand des hohlzylindrischen Teiles die Oberkante der Büchse überschleift.With the measure of a screw-in spring plate or cover, however, the advantage is further achieved that openings, in particular an axial bore, can be arranged in this detachable spring plate, the bushing then at least one radial opening into the space surrounding the bushing at a distance from the spring plate having. If, as it corresponds to a preferred embodiment of the device according to the invention, the hollow cylindrical part of the chisel shaft or the part connected to this with a positive fit overlaps the bushing almost without play or with the formation of a throttle ring gap, one can be selected by selecting the clear cross section of the openings in the detachable spring plate Achieve throttling effect, which dampens the insertion stroke of the chisel or of the part that is non-positively connected to the chisel shaft. Since the spring plate is detachably connected to the bush, this part can also be easily replaced and the damping behavior of the insertion stroke can be adjusted within wide limits. In order to allow the clear cross-section of the openings in the detachable spring plate to be fully effective for this purpose, only a throttle cross-section or throttle ring gap should remain between the outer wall of the bush and the hollow cylindrical part spanning the bush. The damping does not have to be from the start, i. H. be provided from the beginning of the insertion stroke, but can be used in this case when the edge of the hollow cylindrical part grinds over the upper edge of the sleeve.

Eine besonders leichte Zugänglichkeit zu Wartungszwecken und ein besonders vereinfachter Austausch der einzelnen Teile ergibt sich dann, wenn die Büchse mit einem vorzugsweise einschraubbaren Abschlussdeckel für eine Hülse verbunden ist. In vorteilhafter Weise ist die Büchse mit dieser Hülse einstückig verbunden und koaxial mit dieser ausgebildet, wobei in der Hülse der Meisselschaft oder ein mit diesem kraftschlüssig verbundener Teil dichtend geführt ist und an den Abschlussdeckel eine zentrische Wasserzuführungsbohrung zum am Grund der Büchse angeordneten Ventilsitz des Rückschlagventiles vorgesehen ist. Auf diese Weise wird eine kompakte Baueinheit erreicht, welche insgesamt dichtend in die Meisselhalterbohrung eingesetzt werden kann und auch bei einem Wechsel des Meissels, der je nach Beanpruchung des Meissels mehr oder weniger häufig erforderlich ist, unverändert in seiner Lage bleiben kann. Dieser Vorteil wird vor allen Dingen dann erreicht, wenn der mit dem Meisselschaft kraftschlüssig verbundene Teil als Stössel ausgebildet ist, dessen Auswärtshub aus der Hülse durch Anschläge begrenzt ist. Auf diese Weise kann der Meissel sogar bei anstehendem Flüssigkeitsdruck und geöffnetem Rückschlagventil ohne weiteres getauscht werden, da ein dichter Abschluss des mit Flüssigkeit gefüllten Raumes durch den in der Hülse dichtend geführten Stössel gewährleistet ist.A particularly easy access for maintenance purposes and a particularly simplified exchange of the individual parts results when the bushing is connected to a preferably screw-in cover for a sleeve. Advantageously, the sleeve is integrally connected to this sleeve and is formed coaxially therewith, with the chisel shaft or a non-positively connected part being sealingly guided in the sleeve and a central water supply hole being provided on the end cover for the valve seat of the check valve arranged at the base of the sleeve is. In this way, a compact unit is achieved, which can be used sealingly in the bit holder bore and also when changing the bit, depending after the chisel has been used more or less frequently, can remain unchanged This advantage is achieved above all if the part which is non-positively connected to the chisel shaft is designed as a plunger, the outward stroke of which is limited by stops. In this way, the chisel can be easily exchanged even when the liquid pressure is present and the check valve is open, since a tight seal of the liquid-filled space is ensured by the plunger sealingly guided in the sleeve.

Um die Gefahr einer Beschädigung der Hülse und des dichtend geführten Stössels herabzusetzen, ist in vorteilhafter Weise der axiale Hub des Meisselschaftes durch gesonderte Anschläge begrenzt, wobei der maximale Hub des Meisselschaftes in das Innere des Meisselhalters kleiner ist als der maximale Hub des mit dem Meisselschaft kraftschlüssig verbundenen Teiles in das Innere der Hülse. Es schlägt somit beim Einwärtshub des Meisselschaftes immer der Meisselschaft zuerst am Grund bzw. dem entsprechenden Anschlag an und es werden keine Kräfte auf den Stössel wirksam, welche zu einer Verformung desselben bzw. der Büchse führen könnten.In order to reduce the risk of damage to the sleeve and the sealingly guided plunger, the axial stroke of the chisel shaft is advantageously limited by separate stops, the maximum stroke of the chisel shaft into the interior of the chisel holder being smaller than the maximum stroke of the force-fit with the chisel shaft connected part in the interior of the sleeve. During the inward stroke of the chisel shaft, the chisel shaft always strikes the base or the corresponding stop first, and no forces act on the ram, which could lead to deformation of the same or the sleeve.

In vorteilhafter Weise ist die Düse über einen Kanal und wenigstens eine radiale Durchbrechung der Hülse mit dem Raum für das auszuspritzende Volumen verbunden. Die Düse weist hiebei entweder einen Drosselquerschnitt auf, um sicherzustellen, dass bei einem raschen Einwärtshub des Stössels tatsächlich zuerst das Rückschlagventil sicher geschlossen wird, bevor Flüssigkeit ausgestossen wird, und um sicherzustellen, dass ein entsprechender Druck für das Auspressen von Flüssigkeit erreicht wird. Alternativ hiezu kann aber auch ein Überdruckventil in der Leitung zur Düse oder in der Düse selbst angeordnet sein. Die Anordnung eines derartigen Überdruckventiles in der Düse selbst erlaubt wiederum den einfachen Ausbau, die einfache Einstellung und den einfachen Austausch der einzelnen Teile. Um auch hier die Einstellbarkeit in weiten Grenzen sicherzustellen, ist vorzugsweise das Überdruckventil im Düsenkörper angeordnet und gegen einen verstellbaren Federteller bzw. Ventilsitz im Düsenkörper abgestützt.The nozzle is advantageously connected to the space for the volume to be sprayed out via a channel and at least one radial opening in the sleeve. The nozzle either has a throttle cross-section to ensure that when the plunger moves in rapidly, the check valve is actually closed securely first before liquid is expelled and to ensure that a corresponding pressure for squeezing out liquid is reached. Alternatively, a pressure relief valve can also be arranged in the line to the nozzle or in the nozzle itself. The arrangement of such a pressure relief valve in the nozzle itself in turn allows for simple removal, adjustment and replacement of the individual parts. In order to ensure the adjustability within wide limits here, too, the pressure relief valve is preferably arranged in the nozzle body and is supported against an adjustable spring plate or valve seat in the nozzle body.

Die Erfindung wird nachfolgend an Hand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert.The invention is explained in more detail below with reference to an embodiment shown in the drawing.

In der Zeichnung ist ein Meissel 1, welcher als Rundmeissel ausgebildet ist, in einer in einen Meisselhalter 2 eingepressten Bundbüchse 3 in Richtung seiner Achse 4 verschieblich aufgenommen. Der maximale Hub des Meissels ist hiebei mit a bezeichnet und wird durch Anschlag am Bund der Büchse 3 begrenzt. Zur Sicherung des Meissels gegen Herausfallen ist eine Feder 5 vorgesehen, welche in eine seitliche Ausnehmung 6 des Meisselschaftes 7 eingreift. Kraftschlüssig mit diesem Meisselschaft 7 ist ein Stössel 8 verbunden, welcher gleitend und dichtend in einer Hülse 9 geführt ist. Der Stössel 8 weist einen zylindrischen Hohlraum 10 auf, welcher beim Eintauchen des Meissels eine Büchse 11 übergreift. In dieser Büchse 11 ist ein Rückschlagventil 12 angeordnet, dessen Ventilfeder mit 13 bezeichnet ist. Der Federteller dieser Ventilfeder ist als einschraubbarer Deckel 14 für die Büchse 11 ausgebildet und weist eine zentrische Bohrung 15 auf. Die Büchse 11 weist radiale Durchbrechungen 16 nahe dem Ventilsitz 17 auf, über welche das über die Durchbrechung 15 eingepresste Wasser in den umgebenden Ringraum 18 ausgepresst wird. Der Innendurchmesser b des hohlzylindrischen Raumes 10 im Stössel 8 ist hiebei im wesentlichen gleich dem Aussendurchmesser der Büchse 11, so dass bei zunehmendem Übergriff des Stössels 8 über die Büchse 11 der Grossteil des aus dem zylindrischen Hohlraum 10 ausgepressten Wassers tatsächlich über die Bohrung 15 und die radialen Bohrungen 16 in den Ringraum 18 ausgepresst wird. Die Bohrung 15 kann dadurch als Drosselquerschnitt ausgebildet werden und erlaubt es, den Hub des Meissels in entsprechender Weise zu dämpfen. Durch die Austauschbarkeit des Federtellers 14 lassen sich verschiedene Federteller mit unterschiedlichen lichten Querschnitten der Durchbrechungen 15 bereitstellen um eine Anpassung an die Bedürfnisse zu erzielen. Ebenso leicht lässt sich die Feder 13 austauschen oder durch mehr oder minder weites Einschrauben des Federtellers oder Zwischenlegen von Einlagescheiben in der Vorspannung regulieren.In the drawing, a chisel 1, which is designed as a round chisel, is slidably received in a collar bush 3 pressed into a chisel holder 2 in the direction of its axis 4. The maximum stroke of the chisel is designated a and is limited by a stop on the collar of the sleeve 3. To secure the chisel against falling out, a spring 5 is provided which engages in a lateral recess 6 of the chisel shaft 7. A ram 8 is non-positively connected to this chisel shaft 7 and is guided in a sleeve 9 in a sliding and sealing manner. The plunger 8 has a cylindrical cavity 10 which engages over a bush 11 when the chisel is immersed. In this sleeve 11, a check valve 12 is arranged, the valve spring is designated 13. The spring plate of this valve spring is designed as a screw-in cover 14 for the bush 11 and has a central bore 15. The bushing 11 has radial openings 16 near the valve seat 17, via which the water pressed in via the opening 15 is pressed into the surrounding annular space 18. The inside diameter b of the hollow cylindrical space 10 in the plunger 8 is essentially the same as the outside diameter of the bush 11, so that when the plunger 8 overlaps the bush 11, the majority of the water squeezed out of the cylindrical cavity 10 actually via the bore 15 and the radial bores 16 is pressed into the annular space 18. The bore 15 can thus be designed as a throttle cross section and allows the stroke of the chisel to be damped in a corresponding manner. Due to the interchangeability of the spring plate 14, different spring plates with different clear cross sections of the openings 15 can be provided in order to achieve an adaptation to the needs. It is just as easy to replace the spring 13 or to regulate the preload by screwing the spring plate more or less far or by inserting washers.

Die Hülse 9 weist radiale Durchbrechungen 19 auf, in welche Kanäle 20 zur Zuführung des Druckmediums zu einer Düse 21 münden.The sleeve 9 has radial openings 19, into which channels 20 open for supplying the pressure medium to a nozzle 21.

Die Düse 21 besteht aus einem Düsenkörper 22, welcher ein Überdruckventil 23 enthält. Das Überdruckventil 23 ist gegen eine Ventilfeder 24 abgestützt, wobei der Ventilsitz 25 an einem einschraubbaren Teil 26 vorgesehen ist, welcher in den Düsenkörper 22 eingeschraubt wird. Auch hier lässt sich nach Lösen des Sicherungselementes 27 und Herausnehmen der Düse 21 durch Wahl geeigneter Federn bzw. durch Verstellung der Federvorspannung mittels des einschraubbaren Teiles 26 eine Anpassung in weiten Grenzen erzielen.The nozzle 21 consists of a nozzle body 22 which contains a pressure relief valve 23. The pressure relief valve 23 is supported against a valve spring 24, the valve seat 25 being provided on a screw-in part 26 which is screwed into the nozzle body 22. Here, too, after loosening the securing element 27 and removing the nozzle 21 by selecting suitable springs or by adjusting the spring preload by means of the screw-in part 26, an adaptation within wide limits can be achieved.

Der Auswärtshub des Stössels 8 in der Hülse 9 wird durch Anschläge 28 begrenzt, so dass der Meissel unabhängig von einem anstehenden Flüssigkeitsdruck getauscht werden kann. Die Wasserzuführung erfolgt über eine zentrische Bohrung 29, wobei der Ventilsitz 17 des Rückschlagventiles in einem Abschlussdeckel 30 vorgesehen ist, welcher gemeinsam mit der Büchse 11 ausgebaut werden kann. Auf diese Weise werden Wartungsarbeiten und Einstellarbeiten wesentlich erleichtert.The outward stroke of the plunger 8 in the sleeve 9 is limited by stops 28, so that the chisel can be exchanged independently of an existing liquid pressure. The water is supplied via a central bore 29, the valve seat 17 of the check valve being provided in an end cover 30, which can be removed together with the bush 11. In this way, maintenance work and adjustment work are made considerably easier.

Das mit dem Meisselschaft 7 in Kontakt gelangende vordere Ende des Stössels 8 ist aus einem schlagzähen Werkstoff gebildet und mit 31 bezeichnet. Der Hub a ist kleiner als der maximale Hub des Stössels 8, so dass eine Verformung des Stössels durch die Wucht des Meissels nicht zu befürchten ist.The front end of the plunger 8 which comes into contact with the chisel shank 7 is formed from an impact-resistant material and is designated by 31. The stroke a is smaller than the maximum stroke of the plunger 8, so that there is no fear of the plunger being deformed by the force of the chisel.

Claims (9)

1. A device for feeding water under pressure to nozzles on the periphery of a coal cutting tool which is fitted with bits (1) whose stems (7) are mounted so as to be axially displaceable in bit holders (2), the water being discharged from the nozzles (21) in dependence upon the displacement movement of the bit (1) and the volume of water to be sprayed out being able to be fed to a chamber in the bit holder (2) via a non-return valve (12), in which chamber the bit stem (7) or a part connected thereto is submerged, characterised in thatthe non-return valve (12) and the valve spring (13) are arranged in a casing (11), which is overlapped by a hollow cylindrical part (10) of the bit stem (7) or of a part connected thereto in a force-locking manner when the bit (1) is displaced inwardly, the liquid between the hollow cylindrical part (10) of the bit stem (7) and the casing (11) flowing out partially throttled during the stroke of the bit.
2. A device according to claim 1, characterised in that the valve spring (13) is supported against a spring rest (11), preferable a screw cover (14), detachably connected to the casing (11).
3. A device according to claim 2, characterised in that the detachable spring rest (14) has perforations, more particularly an axial bore (15), and that the casing (11) at a distance from the spring rest (14) has at least one radial perforation (16) into the space (18) surrounding the casing (11).
4. A device according to claim 1,2 or 3, characterised in that the hollow cylindrical part (10) of the bit stem (7) or of the part connected in a force-locking manner thereto overlaps the casing (11) so as to be almost free from play by forming a throttle annular gap.
5. A device according to any one of claims 1 to 4, characterised in that the casing (11) is connected to a, preferably screwable, sealing lid (30) for a housing, and more particularly is formed in one piece and coaxially therewith, that in the housing (9) the bit stem (7) or a part connected in a force-locking manner thereto is guided so as to be sealing tight, and thatthe sealing lid (30) has a central water feed bore (29) to the valve seat (17) of the non-return valve (12) arranged on the base of the casing (11).
6. A device according to any one of claims 1 to 5, characterised in that the part connected in a force-locking manner to the bit stem (7) is formed as a push rod (8), the upward stroke of which out of the housing (9) is limited by stops (28).
7. A device according to any one of claims 1 to 6, characterised in that the axial stroke of the drill stem (7) is limited by separate stops, the maximum stroke (a) of the bit stem (7) inside the bit holder (2) being smaller than the maximum stroke of the part connected in a force-locking manner to the bit stem (7) inside the housing (9).
8. A device according to any one of claims 1 to 7, characterised in that the nozzle (21 ) is connected via a channel (20) and at least one radial perforation (19) of the housing (9) to the chamber for the volume to be sprayed out and has either a throttle section or a pressure valve (23).
9. A device according to claim 8, characterised in that the pressure valve (23) is arranged in the nozzle body (22) and is supported against an adjustable spring rest or valve seat (25).
EP19850890264 1984-10-24 1985-10-23 Device for feeding water under pressure to the nozzles at the periphery of a coal cutting tool Expired EP0181318B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT3386/84 1984-10-24
AT0338684A AT381364B (en) 1984-10-24 1984-10-24 DEVICE FOR SUPPLYING WATER UNDER PRESSURE TO OUTLET NOZZLES ON THE CIRCUMFERENCE OF A SCREWING TOOL

Publications (2)

Publication Number Publication Date
EP0181318A1 EP0181318A1 (en) 1986-05-14
EP0181318B1 true EP0181318B1 (en) 1987-09-16

Family

ID=3549744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850890264 Expired EP0181318B1 (en) 1984-10-24 1985-10-23 Device for feeding water under pressure to the nozzles at the periphery of a coal cutting tool

Country Status (3)

Country Link
EP (1) EP0181318B1 (en)
AT (1) AT381364B (en)
DE (1) DE3560647D1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT385320B (en) * 1986-07-17 1988-03-25 Voest Alpine Ag SPRAYING DEVICE FOR COOLANT FROM A NOZZLE OF A SCREW HEAD
SE463725B (en) * 1988-07-19 1991-01-14 Sandvik Ab VALVE
DE19624363B4 (en) * 1995-07-06 2004-02-05 Rag Ag Chisel-equipped extraction machine with spray inspection device
DE102009039257A1 (en) 2009-08-28 2011-03-10 Up Management Gmbh Blood pressure measuring device and method for measuring the blood pressure of a living being
EA029740B9 (en) * 2013-03-21 2018-08-31 Сухуа Лю Impact reciprocating module for a mining machine
CN104747071B (en) * 2015-01-12 2016-10-19 徐州博安科技发展有限责任公司 A kind of hydrodynamic force drilling slotting method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2616880A1 (en) * 1976-04-15 1977-10-27 Bochumer Eisen Heintzmann Changeover valve for mine dust water spray - has coaxial valve seats connected to hydraulic pulse generators
DE2854307A1 (en) * 1978-12-15 1980-07-03 Kennametal Inc BRACKET FOR ATTACHING CHISELS, ESPECIALLY ROUNDING CHISELS TO MINING EXTRACTION AND TRACKING MACHINES
DE3007055C2 (en) * 1980-02-26 1982-10-14 Krampe & Co Fertigung in Bergbaubedarf GmbH, Zweigniederlassung Pelkum, 4700 Hamm Spray nozzle for a mining machine
DE3102884C2 (en) * 1981-01-29 1983-06-16 Mannesmann AG, 4000 Düsseldorf Chipping chisel with water jet
AT375149B (en) * 1982-07-06 1984-07-10 Voest Alpine Ag CHISEL HOLDER EQUIPPED WITH A SPRAYING DEVICE

Also Published As

Publication number Publication date
EP0181318A1 (en) 1986-05-14
ATA338684A (en) 1986-02-15
DE3560647D1 (en) 1987-10-22
AT381364B (en) 1986-10-10

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