EP0099350B1 - Pick holder with spraying device - Google Patents

Pick holder with spraying device Download PDF

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Publication number
EP0099350B1
EP0099350B1 EP83890108A EP83890108A EP0099350B1 EP 0099350 B1 EP0099350 B1 EP 0099350B1 EP 83890108 A EP83890108 A EP 83890108A EP 83890108 A EP83890108 A EP 83890108A EP 0099350 B1 EP0099350 B1 EP 0099350B1
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EP
European Patent Office
Prior art keywords
bit
receiving bore
shaft
valve
holder
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
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EP83890108A
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German (de)
French (fr)
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EP0099350A1 (en
Inventor
Alfred Zitz
Herwig Wrulich
Otto Dipl.-Ing. Schetina
Wilfried Maier
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Voestalpine AG
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Voestalpine AG
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Publication of EP0099350A1 publication Critical patent/EP0099350A1/en
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Expired legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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 chisel holder equipped with a spraying device, in particular for cutting heads, with a receiving bore in which the shank of the chisel, optionally with the interposition of a bushing, is axially displaceable and optionally rotatably supported, the displacement of the chisel shaft in the direction of the Cutting pressure is limited by the stop and the chisel shaft is loaded against the cutting pressure by a restoring force and wherein a valve for the supply of water to the chisel or to the face during the cut is arranged in the chisel holder, which valve is opened by the axial displacement of the chisel shaft under the effect of the cutting pressure (see EP-A-10534).
  • the object of the invention is to simplify the transmission of the movement of the bit shaft to the valve and at the same time to avoid weakening the bit holder.
  • the invention consists essentially in that the receiving bore is at least partially closed at the end facing away from the chisel tip, that the housing of the valve is arranged coaxially with the chisel shaft in the receiving bore in the deepest region thereof, the averting from the chisel tip End of the chisel shaft acts on the actuator of the valve, and that the jacket of the receiving bore between the seat of the valve and the mouth of the receiving bore at an axial distance from the mouth of the receiving bore, which is greater than or equal to the axial depth to which the Chisel shank protrudes into the receiving bore when abutting against the stop, has at least one opening which opens on the outside of the chisel holder.
  • the receiving bore is at least partially closed at the end facing away from the chisel tip prevents a weakening of the chisel holder.
  • the housing of the valve is arranged coaxially with the chisel shaft in the receiving bore, the rear end of the chisel shaft can act directly on the actuating member of the valve and this results in a simplification of the actuation of the valve.
  • such a design enables a simpler construction of the chisel holder, since only one hole has to be provided here, which simultaneously serves as a receiving bore for the chisel shaft and as a receiving bore for the valve housing.
  • the chisel holder can therefore also be made smaller.
  • xxxxxx openings opening into the jacket of the receiving bore prevents contaminants or liquids that have penetrated between the chisel shaft and the receiving bore from reaching the valve seat. This is important because the axial displacement movement of the chisel shank creates a pumping action that promotes the conveyance of contaminants to the rear end of the chisel shank. If dirt would get to the valve seat, the valve will certainly leak.
  • a channel can be connected to the opening, which includes an acute angle with the axis of the receiving bore, the tip of which points in the direction of the mouth of the receiving bore. The inclination of this channel or several channels promotes the removal of contaminants.
  • the valve is expediently a cone valve and, according to the invention, the stem of the valve cone on which the chisel shaft acts is preferably leaky in the valve housing. In this way, water gets into the receiving bore and this has the advantage that the dirt is flushed out through the openings.
  • the stem of the valve cone is only partially sealed against the valve housing by a slotted sealing ring. In this way, leakage losses and thus the amounts of water entering the receiving bore can be precisely determined by the size of the gap will.
  • the arrangement is expediently such that the end part of the chisel shaft facing away from the chisel tip engages around the stem of the valve cone in a pot-like manner.
  • the possible stroke of the valve cone is expediently greater than the axial path of the chisel shaft up to the stop. This creates a reserve stroke, so to speak, so that even if the stop surface of the valve stem on the chisel stem is worn, the opening of the valve is still guaranteed with certainty.
  • the openings can be arranged in at least one cross-sectional plane behind the inner end of the bushing according to the invention. This is useful since in this case the bushing does not have to be drilled through.
  • annular grooves can advantageously be provided on the inside of the receiving bore or the bushing between the mouth of the receiving bore and the opening.
  • a sealing ring can be inserted into at least one of the grooves, while the remaining grooves serve as dirt-collecting grooves.
  • Fig. 1 shows a section through the chisel holder in the axis of the receiving bore along line 1 - I of Fig. 2.
  • Fig. 2 shows a view of the chisel holder in the direction of arrow 11 of Fig. 1.
  • Fig. 3 shows a section according to line 111-111 of FIG. 2.
  • a receiving bore 2 for the shank 3 of the chisel 4 is provided in the chisel holder 1.
  • the shaft 3 of the chisel 4 is rotatably and axially displaceably mounted in the receiving bore.
  • the chisel holder 1 has a stop 5, with which a stop shoulder 6 of the chisel 4 interacts, whereby the path of the chisel shaft 3 in the direction of the cutting pressure is limited.
  • the bit holder 1 is welded to a cutting head at 7.
  • the receiving hole 2 is not continuous, but is designed as a blind hole.
  • a valve housing 9 of a valve 10, 11 is inserted into the rear region 8 of the receiving bore 2.
  • the valve cone is designated 10 and the valve seat 11.
  • the shaft 12 of the valve cone 10 lies against the rear end 13 of the chisel shaft. If the chisel shaft is moved in the direction of the cutting pressure during the cut, it lifts the valve cone 10 from the seat 11 and releases the water supply via an annular groove 8 to a nozzle 14 accommodated in the chisel holder 1, through which a water jet against the chisel 4 or is injected against the face.
  • the water supply to the space 25 in front of the valve seat 11 takes place through a bore (not shown) in the bit holder 1.
  • openings 16 are arranged in the wall of the receiving bore, through which dirt which has penetrated into the receiving bore 2 is conveyed to the outside. Connections 17 to these openings, as shown in FIGS. 2 and 3, connect to the outside of the bit holder 1.
  • the valve stem 12 is guided in a bore 18 of the valve housing and sealed by a sealing ring 19.
  • This sealing ring is slotted so that a certain amount of leak water can pass into the space 20 behind the chisel shaft 3.
  • the dirt collecting in the space behind the chisel shaft 3 is flushed out through the openings 16 and the channels 17.
  • This is favored by the fact that the rear end part 15 of the chisel shaft 3 engages around the shaft 12 of the valve cone in a pot-like manner. In this way, an annular gap 24 is formed, which is flushed through by the leak water.
  • a bushing can be pressed into the receiving bore 2. Ring grooves 21, 22 and 23 are provided on the inside of the receiving bore 2. A seal can be inserted into the annular groove 22. The ring grooves 21 and 23 can act as dirt trapping grooves. If a bushing is pressed into the receiving bore 2, the grooves 21, 22 and 23 can be provided on the inside of this bushing.

Description

Die Erfindung bezieht sich auf einen mit einer Sprühvorrichtung ausgestatteten Meißelhalter, insbesondere für Schrämköpfe, mit einer Aufnahmebohrung, in welcher der Schaft des Meißels, gegebenenfalls unter Zwischenschaltung einer Büchse, axial begrenzt verschiebbar und gegebenenfalls verdrehbar gelagert ist, wobei die Verschiebung des Meißelschaftes in Richtung des Schnittdruckes durch Anschlag begrenzt ist und der Meißelschaft entgegen dem Schnittdruck durch eine Rückstellkraft belastet ist und wobei im Meißelhalter ein Ventil für die Zuführung von Wasser zum Meißel oder zur Ortsbrust während des Schnittes angeordnet ist, welches durch die Axialverschiebung des Meißelschaftes unter der Wirkung des Schnittdruckes geöffnet wird (siehe EP-A-10534). Bei den bekannten Meißelhaltern dieser Art, welche mit einem Ventil für die Zuführung des Wassers zur Sprühdose ausgestattet sind, wird die unter dem Schnittdruck erfolgende Verschiebung des Meißelschaftes durch Kanten am Meißel auf das Ventil übertragen. Ein solcher Übertragungsmechanismus erfordert im Meißelhalter eine zusätzliche Bohrung für das Ventil. Die Aufnahmebohrung im Meißelhalter für den Meißelschaft ist an der Hinterseite des Meißelschaftes offen, um die Übertragungsglieder, welche die axiale Verschiebung des Meißel-schaftes auf das Ventil übertragen, unterzubringen und dadurch ergibt sich wieder eine Schwächung des Meißelhalters.The invention relates to a chisel holder equipped with a spraying device, in particular for cutting heads, with a receiving bore in which the shank of the chisel, optionally with the interposition of a bushing, is axially displaceable and optionally rotatably supported, the displacement of the chisel shaft in the direction of the Cutting pressure is limited by the stop and the chisel shaft is loaded against the cutting pressure by a restoring force and wherein a valve for the supply of water to the chisel or to the face during the cut is arranged in the chisel holder, which valve is opened by the axial displacement of the chisel shaft under the effect of the cutting pressure (see EP-A-10534). In the known chisel holders of this type, which are equipped with a valve for supplying the water to the spray can, the displacement of the chisel shaft under the cutting pressure is transmitted to the valve by edges on the chisel. Such a transmission mechanism requires an additional hole for the valve in the bit holder. The receiving hole in the chisel holder for the chisel shaft is open at the rear of the chisel shaft in order to accommodate the transmission members which transmit the axial displacement of the chisel shaft to the valve, and this results in a weakening of the chisel holder.

Aus der DE-A-28 54 307 ist bekannt, eine Einsatzhülse mit einer Abdichtung im tiefsten Bereich der Aufnahmebohrung koaxial mit dem Meißelschaft anzuordnen. Weiters ist aus der SU-A-685 821 bekannt geworden, das der Meißelspitze abgewendete Ende des Meißelschaftes auf das Betätigungsglied eines Ventils wirken zu lassen.From DE-A-28 54 307 it is known to arrange an insert sleeve with a seal in the deepest region of the receiving bore coaxially with the chisel shank. Furthermore, it is known from SU-A-685 821 that the end of the chisel shaft facing away from the chisel tip can act on the actuating element of a valve.

Aufgabe der Erfindung ist es, die Übertragung der Bewegung des Meißelschaftes auf das Ventil zu vereinfachen und gleichzeitig eine Schwächung des Meißelhalters zu vermeiden. Zur Erfüllung dieser Aufgabe besteht die Erfindung im wesentlichen darin, daß die Aufnahmebohrung an dem der Meißelspitze abgewendeten Ende zumindest teilweise abgeschlossen ist, daß das Gehäuse des Ventils in der Aufnahmebohrung im tiefsten Bereich derselben koaxial mit dem Meißelschaft angeordnet ist, wobei das von der Meißelspitze abgewendete Ende des Meißelschaftes auf das Betätigungsglied des Ventils wirkt, und daß der Mantel der Aufnahmebohrung zwischen dem Sitz des Ventils und der Mündung der Aufnahmebohrung in einem Axialabstand von der Mündung der Aufnahmebohrung, welcher größer als oder gleich wie die axiale Tiefe ist, bis zu welcher der Meißelschaft bei Anlage am Anschlag in die Aufnahmebohrung ragt, wenigstens eine Durchbrechung aufweist, welche an der Außen-seite des Meißelhalters mündet. Dadurch, daß die Aufnahmebohrung an dem der Meißelspitze abgewendeten Ende zumindest teilweise abgeschlossen ist, wird eine Schwächung des Meißelhalters vermieden. Dadurch, daß das Gehäuse des Ventils in der Aufnahmebohrung koaxial mit dem Meißelschaft angeordnet ist, kann das hintere Ende des Meißelschaftes unmittelbar auf das Betätigungsglied des Ventils wirken und dadurch ergibt sich eine Vereinfachung der Betätigung des Ventils. Überdies ermöglicht eine solche Ausbildung eine einfachere Konstruktion des Meißelhalters, da hier nur mehr eine Bohrung vorgesehen sein muß, welche gleichzeitig als Aufnahmebohrung für den Meißelschaft und als Aufnahmebohrung für das Ventilgehäuse dient. Es kann daher auch der Meißelhalter kleiner dimensioniert sein. Dadurch, daß zwischen dem Sitz des Ventils und der Mündung der Aufnahmebohrung, und zwar in einem Axialabstand von der Mündung, welcher größer oder gleich als die axiale Tiefe ist, bis zu welcher der Meinelschaft reicht, xxxxxx ins Freie mündende Durchbrechungen im Mantel der Aufnahmebohrung vorgesehen sind, wird vermieden, daß zwischen Meißel-schaft und Aufnahmebohrung eingedrungene Verunreinigungen oder Flüssigkeiten bis zum Ventilsitz gelangen. Dies ist deshalb von Wichtigkeit, weil durch die axiale Verschiebebewegung des Meißelschaftes eine Pumpwirkung entsteht, welche eine Förderung von Verunreinigungen bis zum hinteren Ende des Meißel-schaftes begünstigt. Wenn Schmutz bis zum Ventilsitz gelangen würde, so wird dadurch mit Sicherheit das Ventil undicht werden. Diejenigen Verunreinigungen, welche bis zum Ende des Meißelschaftes durch diese Pumpwirkung gefördert werden, treten durch die Durchbrechung oder Durchbrechungen aus und können daher nicht bis in den Bereich des Ventilsitzes gelangen. Gemäß der Erfindung kann an die Durchbrechung ein Kanal anschließen, welcher mit der Achse der Aufnahmebohrung einen spitzen Winkel einschließt, dessen Spitze in Richtung zur Mündung der Aufnahmebohrung weist. Durch die schräge Lage dieses Kanals oder mehrerer Kanäle wird die Abförderung von Verunreinigungen begünstigt.The object of the invention is to simplify the transmission of the movement of the bit shaft to the valve and at the same time to avoid weakening the bit holder. To achieve this object, the invention consists essentially in that the receiving bore is at least partially closed at the end facing away from the chisel tip, that the housing of the valve is arranged coaxially with the chisel shaft in the receiving bore in the deepest region thereof, the averting from the chisel tip End of the chisel shaft acts on the actuator of the valve, and that the jacket of the receiving bore between the seat of the valve and the mouth of the receiving bore at an axial distance from the mouth of the receiving bore, which is greater than or equal to the axial depth to which the Chisel shank protrudes into the receiving bore when abutting against the stop, has at least one opening which opens on the outside of the chisel holder. The fact that the receiving bore is at least partially closed at the end facing away from the chisel tip prevents a weakening of the chisel holder. Characterized in that the housing of the valve is arranged coaxially with the chisel shaft in the receiving bore, the rear end of the chisel shaft can act directly on the actuating member of the valve and this results in a simplification of the actuation of the valve. In addition, such a design enables a simpler construction of the chisel holder, since only one hole has to be provided here, which simultaneously serves as a receiving bore for the chisel shaft and as a receiving bore for the valve housing. The chisel holder can therefore also be made smaller. Characterized in that between the seat of the valve and the mouth of the receiving bore, at an axial distance from the mouth which is greater than or equal to the axial depth to which the community extends, xxxxxx openings opening into the jacket of the receiving bore prevents contaminants or liquids that have penetrated between the chisel shaft and the receiving bore from reaching the valve seat. This is important because the axial displacement movement of the chisel shank creates a pumping action that promotes the conveyance of contaminants to the rear end of the chisel shank. If dirt would get to the valve seat, the valve will certainly leak. Those contaminations, which are pumped up to the end of the chisel shaft by this pumping effect, emerge through the opening or openings and therefore cannot reach the area of the valve seat. According to the invention, a channel can be connected to the opening, which includes an acute angle with the axis of the receiving bore, the tip of which points in the direction of the mouth of the receiving bore. The inclination of this channel or several channels promotes the removal of contaminants.

Das Ventil ist zweckmäßig ein Kegelventil und gemäß der Erfindung ist vorzugsweise der Schaft des Ventilkegels, auf welchen der Meißelschaft wirkt, undicht im Ventilgehäuse geführt. Auf diese Weise gelangt Wasser in die Aufnahmebohrung und dies hat den Vorteil, daß der Schmutz durch die Durchbrechungen herausgespült wird. Gemäß einer bevorzugten Ausführungsform der Erfindung ist hiebei der Schaft des Ventilkegels durch einen geschlitzten Dichtungsring gegenüber dem Ventilgehäuse nur teilweise abgedichtet. Auf diese Weise können Leckverluste und damit die in die Aufnahmebohrung eintretenden Wassermengen durch die Größe des Spaltes genau bestimmt werden. Hiebei ist gemäß der Erfindung zweckmäßig die Anordnung so getroffen, daß der von der Meißelspitze abgewendete Endteil des Meißelschaftes den Schaft des Ventilkegels topfartig umgreift. Auf diese Weise entsteht ein Ringspalt zwischen diesem topfförmigen Endteil des Meißelschaftes und dem Schaft des Ventilkegels bzw. dem Ventilgehäuseteil, in welchen der Ventilschaft geführt ist. Das Leckwasser tritt am Ende der Ventilführung aus und muß nun diesen Ringspalt durchspülen. Es wird auf diese Weise verhindert, daß Verunreinigungen entgegen dem Spülstrom durch den Ringspalt bis zum Ventilschaft gelangen können.The valve is expediently a cone valve and, according to the invention, the stem of the valve cone on which the chisel shaft acts is preferably leaky in the valve housing. In this way, water gets into the receiving bore and this has the advantage that the dirt is flushed out through the openings. According to a preferred embodiment of the invention, the stem of the valve cone is only partially sealed against the valve housing by a slotted sealing ring. In this way, leakage losses and thus the amounts of water entering the receiving bore can be precisely determined by the size of the gap will. In accordance with the invention, the arrangement is expediently such that the end part of the chisel shaft facing away from the chisel tip engages around the stem of the valve cone in a pot-like manner. In this way, an annular gap is created between this pot-shaped end part of the chisel shaft and the shaft of the valve cone or the valve housing part, in which the valve shaft is guided. The leakage water emerges at the end of the valve guide and must now flush through this annular gap. In this way it is prevented that contaminants can reach the valve stem through the annular gap against the flushing flow.

Gemäß der Erfindung ist zweckmäßig der mögliche Hub des Ventilkegels größer als der axiale Weg des Meißelschaftes bis zum Anschlag. Dadurch wird sozusagen ein Reservehub geschaffen, so daß auch bei einer Abnützung der Anschlagfläche des Ventilschaftes am Meißelschaft noch die Öffnung des Ventils mit Sicherheit gewährleistet wird.According to the invention, the possible stroke of the valve cone is expediently greater than the axial path of the chisel shaft up to the stop. This creates a reserve stroke, so to speak, so that even if the stop surface of the valve stem on the chisel stem is worn, the opening of the valve is still guaranteed with certainty.

Wenn in die Aufnahmebohrung eine Büchse eingepreßt ist, um die Verschleißfestigkeit der den Meißelschaft führenden Aufnahmebohrung zu verbessern, können gemäß der Erfindung die Durchbrechungen in wenigstens einer Querschnittsebene hinter dem inneren Ende der Büchse angeordnet sein. Dies ist zweckmäßig, da in diesem Fall die Büchse nicht durchbohrt werden muß.If a bushing is pressed into the receiving bore in order to improve the wear resistance of the receiving bore guiding the chisel shaft, the openings can be arranged in at least one cross-sectional plane behind the inner end of the bushing according to the invention. This is useful since in this case the bushing does not have to be drilled through.

Gemäß der Erfindung können in vorteilhafter Weise an der Innenseite der Aufnahmebohrung bzw. der Büchse zwischen der Mündung der Aufnahmebohrung und der Durchbrechung Ringnuten vorgesehen sein. Hiebei kann in wenigstens eine der Nuten ein Dichtungsring eingelegt sein, während die restlichen Nuten als Schmutzfangnuten dienen. Dadurch wird die Menge des an die tiefste Stelle der Aufnahmebohrung gelangenden Schmutzes und damit die durch die Durchbrechungen abzufördernde Menge desselben verringert.According to the invention, annular grooves can advantageously be provided on the inside of the receiving bore or the bushing between the mouth of the receiving bore and the opening. A sealing ring can be inserted into at least one of the grooves, while the remaining grooves serve as dirt-collecting grooves. As a result, the amount of dirt reaching the deepest point of the receiving bore and thus the amount of the same to be removed through the openings is reduced.

In der Zeichnung ist die Erfindung anhand eines Ausführungsbeispieles schematisch erläutert. Fig. 1 zeigt einen Schnitt durch den Meißelhalter in der Achse der Aufnahmebohrung nach Linie 1 - I der Fig. 2. Fig. 2 zeigt eine Ansicht des Meißel-halters in Richtung des Pfeiles 11 nach Fig. 1. Fig. 3 zeigt einen Schnitt nach Linie 111 - 111 der Fig. 2.In the drawing, the invention is explained schematically using an exemplary embodiment. Fig. 1 shows a section through the chisel holder in the axis of the receiving bore along line 1 - I of Fig. 2. Fig. 2 shows a view of the chisel holder in the direction of arrow 11 of Fig. 1. Fig. 3 shows a section according to line 111-111 of FIG. 2.

In dem Meißelhalter 1 ist eine Aufnahmebohrung 2 für den Schaft 3 des Meißels 4 vorgesehen. Der Schaft 3 des Meißels 4 ist drehbar und axial verschiebbar in der Aufnahmebohrung gelagert. Der Meißel-halter 1 weist einen Anschlag 5 auf, mit welchem eine Anschlagschulter 6 des Meißels 4 zusammenwirkt, wodurch der Weg des Meißelschaftes 3 in Richtung des Schnittdruckes begrenzt wird. Der Meißelhalter 1 ist bei 7 an einem Schrämkopf angeschweißt.A receiving bore 2 for the shank 3 of the chisel 4 is provided in the chisel holder 1. The shaft 3 of the chisel 4 is rotatably and axially displaceably mounted in the receiving bore. The chisel holder 1 has a stop 5, with which a stop shoulder 6 of the chisel 4 interacts, whereby the path of the chisel shaft 3 in the direction of the cutting pressure is limited. The bit holder 1 is welded to a cutting head at 7.

Die Aufnahmebohrung 2 ist nicht durchgehend, sondern als Sackbohrung ausgeführt. In den hinteren Bereich 8 der Aufnahmebohrung 2 ist ein Ventilgehäuse 9 eines Ventils 10, 11 eingesetzt. Der Ventilkegel ist mit 10 und der Ventilsitz mit 11 bezeichnet. Der Schaft 12 des Ventilkegels 10 liegt am hinteren Stirnende 13 des Meißelschaftes an. Wenn der Meißelschaft in Richtung des Schnittdruckes während des Schnittes verschoben wird, hebt er den Ventilkegel 10 vom Sitz 11 ab und gibt die Wasserzufuhr über eine Ringnut 8 zu einer im Meißelhalter 1 untergebrachten Düse 14 frei, durch welche ein Wasserstrahl gegen den Meißel 4 bzw. gegen die Ortsbrust gespritzt wird. Die Wasserzufuhr zum Raum 25 vor dem Ventilsitz 11 erfolgt durch eine nicht gezeichnete Bohrung im Meißelhalter 1.The receiving hole 2 is not continuous, but is designed as a blind hole. A valve housing 9 of a valve 10, 11 is inserted into the rear region 8 of the receiving bore 2. The valve cone is designated 10 and the valve seat 11. The shaft 12 of the valve cone 10 lies against the rear end 13 of the chisel shaft. If the chisel shaft is moved in the direction of the cutting pressure during the cut, it lifts the valve cone 10 from the seat 11 and releases the water supply via an annular groove 8 to a nozzle 14 accommodated in the chisel holder 1, through which a water jet against the chisel 4 or is injected against the face. The water supply to the space 25 in front of the valve seat 11 takes place through a bore (not shown) in the bit holder 1.

Hinter dem rückwärtigen Endteil 15 des Meißelschaftes 3 sind in der Wandung der Aufnahmebohrung 2 Durchbrechungen 16 angeordnet, durch welche in die Aufnahmebohrung 2 eingedrungener Schmutz nach außen gefördert wird. An diese Durchbrechungen schließen, wie Fig. 2 und 3 zeigen, Kanäle 17 an, welche seitlich des Meißel- halters 1 nach außen münden.Behind the rear end part 15 of the chisel shank 3, openings 16 are arranged in the wall of the receiving bore, through which dirt which has penetrated into the receiving bore 2 is conveyed to the outside. Connections 17 to these openings, as shown in FIGS. 2 and 3, connect to the outside of the bit holder 1.

Der Ventilschaft 12 ist in einer Bohrung 18 des Ventilgehäuses geführt und durch einen Dichtungsring 19 abgedichtet. Dieser Dichtungsring ist geschlitzt ausgebildet, so daß eine gewisse Menge Leckwasser in den Raum 20 hinter dem Meißelschaft 3 hindurchtreten kann. Durch dieses Leckwasser, dessen Menge durch den Schlitz im Dichtungsring 19 bestimmt ist, wird der sich im Raum hinter dem Meißelschaft 3 ansammelnde Schmutz durch die Durchbrechungen 16 und die Kanäle 17 herausgespült. Dies wird dadurch begünstigt, daß der rückwärtige Endteil 15 des Meißelschaftes 3 den Schaft 12 des Ventilkegels topfartig umgreift. Auf diese Weise wird ein Ringspalt 24 gebildet, welcher vom Leckwasser durchspült wird.The valve stem 12 is guided in a bore 18 of the valve housing and sealed by a sealing ring 19. This sealing ring is slotted so that a certain amount of leak water can pass into the space 20 behind the chisel shaft 3. Through this leakage water, the amount of which is determined by the slot in the sealing ring 19, the dirt collecting in the space behind the chisel shaft 3 is flushed out through the openings 16 and the channels 17. This is favored by the fact that the rear end part 15 of the chisel shaft 3 engages around the shaft 12 of the valve cone in a pot-like manner. In this way, an annular gap 24 is formed, which is flushed through by the leak water.

In die Aufnahmebohrung 2 kann eine nicht dargestellte Büchse eingepreßt sein. An der Innenseite der Aufnahmebohrung 2 sind Ringnuten 21, 22 und 23 vorgesehen. In die Ringnut 22 kann eine Dichtung eingesetzt sein. Die Ringnuten 21 und 23 können als Schmutzfangnuten wirken. Wenn in die Aufnahmebohrung 2 eine Büchse einge-preßt ist, so können die Nuten 21, 22 und 23 an der Innenseite dieser Büchse vorgesehen sein.A bushing, not shown, can be pressed into the receiving bore 2. Ring grooves 21, 22 and 23 are provided on the inside of the receiving bore 2. A seal can be inserted into the annular groove 22. The ring grooves 21 and 23 can act as dirt trapping grooves. If a bushing is pressed into the receiving bore 2, the grooves 21, 22 and 23 can be provided on the inside of this bushing.

Claims (9)

1. Bit holder equipped with a spraying device, in particular for cutting heads, comprising a receiving bore (2) within which the shaft (3) of the bit (4) is supported, optionally with interposition of a bushing, for limited axial shifting movement and optionally for being rotated, shifting movement of the bit shaft (3) in direction of the cutting pressure being limited by abutment (5) and the bit shaft being loaded by a restoring force in opposite direction to the cutting pressure and a valve (10, 11) for the supply of water to the bit or to the drift face during cutting operation being arranged within the bit holder (1) and being opened under the action of the cutting pressure by the axial shifting movement of the bit shaft (3), characterised in that the receiving bore (2) is at least partially closed at its end located remote from the bit tip, that the housing (9) of the valve (10, 11) is arranged within the receiving bore (2) at its deepest area and coaxially relative to the bit shaft (3), the end of the bit shaft (3) located remote from the bit tip being acting on the actuating member (12) of the valve (10, 11), and that the mantle of the receiving bore (2) between the seat (11) of the valve (10, 11) and the mouth of the receiving bore (2) and at an axial distance from the mouth of the receiving bore being greater than or equal to the axial depth over which the bit shaft (3) protrudes into the receiving bore (2) in its position engaging the abutment (5) has at least one perforation (16) opening at the exterior side of the bit holder (1).
2. Bit holder as claimed in claim 1, characterised in that a passage (17) including an acute angle with the axis of the receiving bore (2), the vertex of said angle showing in direction to the mouth of the receiving bore, joins the perforation (16).
3. Bit holder as claimed in claim 1 or 2, characterised in that the shaft (12) of the valve cone (10) being acted upon by the bit shaft (3) is untightly guided within the valve housing (9).
4. Bit holder as claimed in claim 3, characterised in that the shaft (12) of the valve cone (10) is only partially sealed relative to the valve housing (9) by means of a slotted sealing ring (19).
5. Bit holder as claimed in any one of claims 1 to 4, characterised in that the end portion (15), located remote from the bit tip, of the bit shaft embraces the shaft (12) of the valve cone (10) in a cup-like manner.
6. Bit holder as claimed in any one of claims 1 to 5, characterised in that the possible stroke of the valve cone (10) is greater than the axial path of the bit shaft to the abutment (5).
7. Bit holder as claimed in any one of claims 1 to 6, characterised in that, if there is arranged a bushing inserted into the receiving bore (2), the perforation (16) is arranged in at least one cross- sectional plane behind the inner end of the bushing.
8. Bit holder as claimed in any one of claims 1 to 7, characterised in that annular grooves (21, 22, 23) are provided on the internal side of the receiving bore (2) or the bushing, resp., between the mouth of the receiving bore (2) and the perforation (16).
9. Bit holder as claimed in claim 8, characterised in that a sealing ring is placed within at least one of the annular grooves (21, 22, 23) and the remaining annular grooves act as dirt catching grooves.
EP83890108A 1982-07-06 1983-06-29 Pick holder with spraying device Expired EP0099350B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0261582A AT375149B (en) 1982-07-06 1982-07-06 CHISEL HOLDER EQUIPPED WITH A SPRAYING DEVICE
AT2615/82 1982-07-06

Publications (2)

Publication Number Publication Date
EP0099350A1 EP0099350A1 (en) 1984-01-25
EP0099350B1 true EP0099350B1 (en) 1986-03-19

Family

ID=3537422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83890108A Expired EP0099350B1 (en) 1982-07-06 1983-06-29 Pick holder with spraying device

Country Status (15)

Country Link
US (1) US4542942A (en)
EP (1) EP0099350B1 (en)
JP (1) JPS598899A (en)
AT (1) AT375149B (en)
AU (1) AU563360B2 (en)
CS (1) CS244128B2 (en)
DE (1) DE3362598D1 (en)
ES (1) ES523603A0 (en)
HU (1) HU186331B (en)
IN (1) IN157043B (en)
PL (1) PL141535B1 (en)
RO (1) RO89108A (en)
SU (1) SU1284461A3 (en)
YU (1) YU42870B (en)
ZA (1) ZA834198B (en)

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US8414085B2 (en) 2006-08-11 2013-04-09 Schlumberger Technology Corporation Shank assembly with a tensioned element
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US8960337B2 (en) 2006-10-26 2015-02-24 Schlumberger Technology Corporation High impact resistant tool with an apex width between a first and second transitions
US7926883B2 (en) 2007-05-15 2011-04-19 Schlumberger Technology Corporation Spring loaded pick
US8322796B2 (en) 2009-04-16 2012-12-04 Schlumberger Technology Corporation Seal with contact element for pick shield
US8701799B2 (en) 2009-04-29 2014-04-22 Schlumberger Technology Corporation Drill bit cutter pocket restitution
CN103253053B (en) * 2013-05-03 2015-12-16 张辉 The multi-functional stone carving device of anti-dust
US9695687B2 (en) * 2015-05-20 2017-07-04 Kennametal Inc. Block with coolant delivery
CN104989283B (en) * 2015-07-30 2017-01-25 杨仁卫 Drill bit capable of automatically spraying water
US10851592B2 (en) * 2017-07-28 2020-12-01 Baker Hughes Movable cutters and devices including one or more seals for use on earth-boring tools in subterranean boreholes and related methods
US11142959B2 (en) 2017-07-28 2021-10-12 Baker Hughes Oilfield Operations Llc Rotatable cutters and elements for use on earth-boring tools in subterranean boreholes, earth-boring tools including same, and related methods
US10697247B2 (en) 2017-07-28 2020-06-30 Baker Hughes, A Ge Company, Llc Rotatable cutters and elements for use on earth-boring tools in subterranean boreholes, earth-boring tools including same, and related methods
US10619421B2 (en) 2017-11-13 2020-04-14 Baker Hughes, A Ge Company, Llc Methods of forming stationary elements of rotatable cutting elements for use on earth-boring tools and stationary elements formed using such methods
CN113818812B (en) * 2021-08-11 2024-01-26 沧州格锐特钻头有限公司 Cone bit with temperature monitoring and cooling functions

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Also Published As

Publication number Publication date
AU563360B2 (en) 1987-07-09
ATA261582A (en) 1983-11-15
US4542942A (en) 1985-09-24
DE3362598D1 (en) 1986-04-24
PL141535B1 (en) 1987-08-31
PL242712A1 (en) 1984-02-27
YU143183A (en) 1986-08-31
ES8404898A1 (en) 1984-05-16
AT375149B (en) 1984-07-10
AU1548483A (en) 1984-01-12
CS391583A2 (en) 1985-08-15
JPS598899A (en) 1984-01-18
EP0099350A1 (en) 1984-01-25
YU42870B (en) 1988-12-31
CS244128B2 (en) 1986-07-17
ZA834198B (en) 1984-05-30
IN157043B (en) 1986-01-04
RO89108A (en) 1986-04-30
JPS6213479B2 (en) 1987-03-26
ES523603A0 (en) 1984-05-16
HU186331B (en) 1985-07-29
SU1284461A3 (en) 1987-01-15

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